WO1998036219A1 - Appareil de combustion - Google Patents

Appareil de combustion Download PDF

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Publication number
WO1998036219A1
WO1998036219A1 PCT/JP1998/000606 JP9800606W WO9836219A1 WO 1998036219 A1 WO1998036219 A1 WO 1998036219A1 JP 9800606 W JP9800606 W JP 9800606W WO 9836219 A1 WO9836219 A1 WO 9836219A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustion
fan
negative pressure
air volume
control data
Prior art date
Application number
PCT/JP1998/000606
Other languages
English (en)
Japanese (ja)
Inventor
Ken Isozaki
Yoshimitsu Matsumoto
Naoyuki Takeshita
Toru Izumisawa
Akihiro Nirasawa
Masaharu Itagaki
Kikuo Okamoto
Kazuyuki Iizumi
Yoshihiko Tanaka
Original Assignee
Gastar Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP3037397A external-priority patent/JPH10227452A/ja
Priority claimed from JP3593797A external-priority patent/JPH10232015A/ja
Priority claimed from JP5824797A external-priority patent/JP3673361B2/ja
Priority claimed from JP06242697A external-priority patent/JP3727437B2/ja
Priority claimed from JP06178597A external-priority patent/JP3777011B2/ja
Priority claimed from JP06178497A external-priority patent/JP3810174B2/ja
Priority claimed from JP06242497A external-priority patent/JP3673362B2/ja
Priority claimed from JP06242597A external-priority patent/JP3673363B2/ja
Priority claimed from JP09320397A external-priority patent/JP3736929B2/ja
Priority claimed from JP10677197A external-priority patent/JPH10281459A/ja
Application filed by Gastar Co., Ltd. filed Critical Gastar Co., Ltd.
Publication of WO1998036219A1 publication Critical patent/WO1998036219A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/06—Postpurge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2235/00—Valves, nozzles or pumps
    • F23N2235/02—Air or combustion gas valves or dampers
    • F23N2235/04—Air or combustion gas valves or dampers in stacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods

Definitions

  • the present invention relates to a combustion device such as a water heater installed in a room, and more particularly to an improvement in combustion control when the room is under a negative pressure with respect to the combustion chamber.
  • FIG. 1 shows an example in which water heater 1 is installed indoors.
  • This type of water heater rotates the combustion fan to supply gas fuel to the wrench, ignites the wrench to form a flame, and heats water passing through the heat exchanger to produce hot water at a set temperature. Guide this hot water to a desired hot water supply place such as a kitchen.
  • a carbon monoxide (hereinafter simply referred to as CO) sensor 28 is provided on the exhaust side of the water heater 1, and the CO concentration in the exhaust gas is detected by the CO sensor 28, and when the CO concentration reaches a dangerous concentration. C ⁇ safety measures such as stopping combustion will be provided.
  • CO carbon monoxide
  • the rotation speed of the combustion fan to be operated after combustion is set in advance to a sufficiently high value so that the exhaust gas does not flow back into the room even if the negative pressure of the ventilation fan or the like works.
  • the hot water is temporarily stopped and then restarted within a certain period of time, the hot water is supplied without any significant temperature fluctuation from the set temperature before the stop.
  • a water heater equipped with a function (Q function) that can do this has been proposed.
  • An object of the present invention is to solve a series of problems caused by the above-described negative pressure state in a chamber.
  • An object of the present invention is to ensure that when an ignition error occurs, a re-ignition is performed to ensure stable formation of a point flame, and that during combustion operation after ignition, the CO concentration in the exhaust gas and the negative pressure in the room are reduced.
  • An object of the present invention is to provide a combustion device capable of appropriately controlling a fan air flow according to a degree and performing good combustion control.
  • an object of the present invention is to reduce the combustion capacity when the room is in a negative pressure state
  • An object of the present invention is to provide a combustion device capable of avoiding deterioration of a combustion state due to shortage.
  • an object of the present invention is to eliminate the state of air supply shortage and smoothly perform the combustion operation when resetting and restarting the combustion operation after the CO safety device operates and the combustion is stopped.
  • An object of the present invention is to provide a combustion apparatus which can be continued and which can reduce the C0 concentration in exhaust gas after restarting combustion and has excellent safety.
  • an object of the present invention is to prevent the exhaust gas from flowing back into the room even when the room is in a negative pressure state, and to keep the fluctuation of the hot water temperature within the allowable temperature range when tapping is resumed. To provide a water heater that can be maintained for a long time.
  • an object of the present invention is to minimize the pressure loss in the exhaust path, to prevent the exhaust gas from flowing back in the exhaust path with a simple configuration, and to reduce the exhaust gas generated by the exhaust sensor without increasing the cost.
  • An object of the present invention is to provide a combustion device that can appropriately detect an abnormality in the combustion.
  • a first aspect of the present invention that achieves the above object is a burner that performs combustion
  • a flame detection sensor that detects the magnitude of the flame of the parner; a combustion fan that supplies and exhausts air to and from the parner; and an air volume control unit that controls a blowing capacity of the combustion fan.
  • the air volume control unit controls the blowing capacity of the combustion fan to a first blowing capacity when the room is in the first pressure state, and the room is lower than the first pressure state and has a negative pressure with respect to a combustion device. Controlling the blowing capacity of the combustion fan to a second blowing capacity higher than the first blowing capacity when in the second pressure state, which is a pressure state, wherein one of the first or second blowing capacity is blown; If the flame of the ignited burner extinguishes when the combustion is started in the state controlled to the capacity, the control is performed to the other of the first or second blowing capacity. And start combustion again.
  • the air volume control unit starts combustion in a state in which the combustion fan is controlled to the air blowing ability at the time when the previous combustion was stopped, of the first or second air blowing ability. It is characterized by.
  • the fan air flow control data in the combustion operation after the ignition, when the C0 concentration detected by the CO sensor becomes high, the fan air flow control data is switched to the data on the air flow up side, and the flame load is increased.
  • the degree of negative pressure in the room is determined from the current, and when the degree of negative pressure in the room increases, the fan air volume control is switched to the air volume up side similarly, and the indoor negative pressure is released. In this case, the fan air volume control data is switched to the air volume down side to eliminate the excess air volume.
  • a suitable combustion operation is performed by appropriate air volume control according to the degree of the negative pressure in the chamber.
  • the air blowing capacity of the combustion fan is, for example, the number of revolutions of the combustion fan, or, in another example, the opening / closing degree of a damper that restricts the air blowing of the combustion fan.
  • the blowing capacity of the combustion fan is controlled to always supply the optimum air volume to the wrench.
  • a second invention for achieving the above object has a burner that performs combustion, a burner that burns air, a combustion fan that supplies and exhausts air to and from the burner, and an air volume control unit that controls a blowing capacity of the combustion fan.
  • a combustion device installed indoors,
  • the air volume control unit controls the blowing capacity of the combustion fan to the first blowing capacity when the room is in the first pressure state during combustion, and the combustion device has a lower room temperature than the first pressure state. Controlling the blowing capacity of the combustion fan to a second blowing capacity higher than the first blowing capacity when in a second pressure state that is a negative pressure state with respect to At the start of combustion, the combustion fan is controlled to have a blowing capacity intermediate between the first and second blowing capacities to ignite the parner.
  • the indoor pressure state can be any one. Even in this state, the wrench can be reliably ignited.
  • a negative pressure detecting device for detecting whether the room is in a first pressure state or a second pressure state is provided,
  • the air flow control unit switches to the first or second air blowing capacity according to the first or second pressure state detected by the negative pressure detection device after the burner is ignited. Is controlled.
  • fan air volume control data at normal time for example, fan air volume control data at negative pressure, and fan air volume control data at ignition time are given in advance.
  • the unit controls the rotation of the combustion fan in accordance with the above-described fan air volume control data at the time of ignition. Thereafter, when the negative pressure is detected by the negative pressure detecting means, the control data transfer control unit transfers the control value from the fan air volume control data at the time of ignition to the fan air volume control data at the time of negative pressure, to thereby control the combustion fan.
  • the combustion fan rotation control is performed by shifting from the fan air flow control data at the time of ignition to the fan air flow control data at the time of negative pressure.
  • the fan air volume control data at the time of the ignition is the air volume area of the combustible combustion fan which the normal fan air volume control data has, and the air volume area of the combustible combustion fan which the fan air volume control data at the negative pressure has. Is set in the area where the combustion equipment is overlapped, so that the ignition is performed regardless of whether the room where the combustion equipment is installed is in a normal standard mode or in a negative pressure state compared to the standard mode. By performing the rotation control of the combustion fan in accordance with the fan air volume control data at the time, it is possible to reliably achieve the point ignition.
  • a third aspect of the present invention provides a burner that performs combustion, a combustion control unit that controls the combustion capacity of the burner, a combustion fan that supplies and exhausts air to the burner, and a blower of the combustion fan.
  • An air volume control unit for controlling the capacity according to the combustion capacity, wherein the combustion device installed indoors, When the combustion control unit controls the burner with a first combustion capacity, the air volume control unit controls the combustion fan to a first blowing capacity according to the first combustion capacity, and When controlling the parner with a second combustion capacity lower than the first combustion capacity, the air volume control unit corresponds to the second combustion capacity and has a second airflow lower than the first airflow capacity. Control the combustion fan to the ability,
  • the air volume control unit controls the combustion fan with a third ventilation capability higher than the second ventilation capability. Controlling, and changing to the second blowing capacity after the predetermined period.
  • the blowing capacity is reduced due to the reduced capacity, a certain period of time is required to alleviate the negative pressure state in the room, so that the period is longer than the reduced blowing capacity.
  • Temporarily control with high third blowing capacity Therefore, it is possible to prevent a temporary shortage of the air volume during the transition period of the capacity reduction.
  • a fourth aspect of the present invention provides a burner that performs combustion, a combustion control unit that controls the combustion performance of the burner, a combustion fan that supplies and exhausts air to and from the burner, A combustion amount control unit for controlling the capacity according to the combustion capacity,
  • a carbon monoxide sensor for detecting the concentration of carbon monoxide in the exhaust gas is provided on the exhaust side of the combustion device,
  • the air volume control unit controls the combustion fan to a blowing capacity according to a combustion capacity, the combustion control unit stops the combustion when a predetermined dangerous concentration is detected by the carbon monoxide sensor,
  • the air volume control unit sets the combustion to a second air blowing capacity larger than the first air blowing capacity when restarting the combustion after the normal combustion stop. It is characterized by controlling a fan.
  • the combustion fan when the combustion is restarted after the combustion is forcibly stopped due to an increase in the concentration of carbon monoxide, the combustion fan is controlled to have a blowing capacity higher than usual. Therefore, it is possible to prevent a dangerous state in which the concentration of carbon monoxide is high at the time of restarting combustion from being repeated.
  • a water heater that supplies indoor air to a combustion chamber and discharges exhausted air after combustion through an exhaust stack to the outside.
  • a negative pressure detection device for detecting the presence or absence of a negative pressure in a direction in which air in the combustion chamber is sucked into the room;
  • a post-combustion fan driving unit that rotationally drives the combustion fan until a predetermined time elapses after the combustion in the combustion chamber is stopped;
  • a rotation speed control unit that sets a rotation speed when the combustion fan is rotated after the combustion is stopped by the post-combustion fan driving unit, when there is a negative pressure, higher than when there is no negative pressure.
  • the fifth invention described above operates as follows.
  • the negative pressure detecting means detects whether or not a negative pressure has been generated due to the operation of the ventilation fan, etc., for drawing air in the combustion chamber into the room.
  • the number-of-revolutions control means determines the number of rotations of the fan when the fan drive means is rotating and driving the combustion fan until a predetermined time elapses after the combustion is stopped. Set a higher rotation speed. This prevents exhaust gas from flowing back into the room even when negative pressure due to a ventilation fan or the like exists, and prevents the rotational speed of the combustion fan from becoming unnecessarily high without negative pressure. be able to.
  • a carbon monoxide concentration detecting means for detecting the concentration of carbon monoxide contained in the exhaust gas
  • a gas amount detecting means for detecting the amount of combustion of the combustion gas
  • a combustion method for controlling the carbon monoxide concentration to fall within a predetermined allowable range.
  • Combustion speed control means for controlling the rotation speed of the combustion fan at the time of combustion, wherein the negative pressure detection means comprises: a combustion amount detected by the gas amount detection means immediately before the stop of combustion; The magnitude of the negative pressure after the combustion is stopped is determined based on the height of the rotation speed set in.
  • the apparatus By determining the magnitude of the negative pressure in this way, there is no need to provide a separate negative pressure sensor in addition to the carbon monoxide concentration detecting means, and the apparatus can be simplified. Furthermore, by setting the number of revolutions of the combustion fan immediately after the combustion is stopped based on not only the presence or absence of the negative pressure but also the magnitude of the negative pressure determined by the negative pressure detecting means, the magnitude of the negative pressure can be adjusted. The appropriate rotation speed is set. If the rotation speed of the combustion fan is gradually reduced from high rotation as time elapses after the stop of combustion, the residual heat after the stop of the combustion is gradually released, so that when the hot water is restarted, the temperature will be lower than the allowable lower limit temperature. The more hot water is discharged, the longer the time required for the release of residual heat after the combustion stops can be extended, and the period during which the Q function can be satisfied can be maintained longer.
  • the combustion fan is operated at a high speed in consideration of the presence or absence of negative pressure. Rotate with. This can prevent exhaust gas from flowing back into the room and, because of the large amount of heat released, temporarily allow high-temperature hot water exceeding the allowable upper limit temperature even if hot water is restarted relatively shortly after combustion stops. It is possible to prevent the overshoot phenomenon, which occurs in a typical manner.
  • the number of revolutions of the combustion fan after exhaust of the exhaust gas remaining in the combustion chamber and exhaust stack from the end of the exhaust stack to the atmosphere is reduced to some extent within a range where hot water exceeding the allowable upper limit temperature is not discharged. .
  • This increases the time it takes for the heat exchanger to become subcooled even if the combustion fan continues to rotate, and for a long time after the combustion is stopped, low-temperature hot water that falls below the minimum allowable temperature is released. The undershoot phenomenon does not occur and the Q function can be maintained for a long time.
  • the rotation speed at each stage and the time until the rotation speed decreases to the next stage are determined according to the length of the exhaust stack.
  • the exhaust remaining in the exhaust pipe can be properly exhausted regardless of the installation status of the water heater.
  • the exhaust resistance also changes according to the length of the exhaust stack, changing the number of revolutions of the combustion fan, etc. based on the length of the exhaust stack cools the heat exchanger with an appropriate air flow regardless of installation conditions. can do . Therefore, the Q function can be satisfied for a long time regardless of the installation condition of the water heater. Can be
  • a sixth aspect of the present invention provides a combustion chamber (630) partitioned in an instrument case (611), and is provided at the most downstream side of an exhaust passage communicating with the combustion chamber (630).
  • An exhaust pipe (644) extending outside the instrument case (611) is provided, and a chamber (644) having a larger flow area than the exhaust pipe (644) is provided upstream of the exhaust pipe (44). 0) in the combustion device (610),
  • the exhaust port (642) in the chamber chamber (640) can be displaced into an open state in which the exhaust port (642) is opened and exhaust gas flows in, and a closed state in which the exhaust port (642) is closed to prevent backflow of exhaust gas.
  • the apparatus case (611) is not located in the exhaust pipe (644) located at the most downstream side of the exhaust path communicating with the combustion chamber (630) but is located upstream of the exhaust pipe (644).
  • a check valve (650) for preventing backflow of exhaust gas is provided at the exhaust port (642) of the chamber (640) provided in the chamber.
  • the non-return valve is located inside the exhaust pipe (644) having a relatively narrow flow path, so that there is no extra resistance to the exhaust flow. Since it opens and closes in the wide chamber chamber (640), the pressure loss at the time of exhaustion due to the check valve (650) itself can be minimized.
  • a seventh aspect of the present invention is a burner that burns, a frame rod electrode that detects the magnitude of the flame of the burner, a combustion fan that supplies and exhausts air to and from the burner, and an air volume control that controls a blowing capacity of the combustion fan.
  • a combustion unit installed indoors, wherein the air volume control unit controls the blowing capacity of the combustion fan in accordance with a detection signal from the flame rod electrode together with the combustion capacity.
  • the blowing capacity of the combustion fan is controlled in accordance with the flame rod current. As a result, it is possible to quickly supply an optimal air volume according to the negative pressure condition in the room.
  • FIG. 1 is an explanatory diagram of a usage condition of a water heater, which is generally known as a combustion device, installed indoors.
  • FIG. 2 is a system configuration diagram of the combustion device in the embodiment.
  • FIG. 3 is a block diagram showing a configuration of a main part of the embodiment of the first invention.
  • FIG. 4 is an explanatory diagram of fan air volume control data given in the embodiment.
  • FIG. 5 is an explanatory diagram of the combustion control data showing the relationship between the proportional valve opening and the amount of combustion heat.
  • FIG. 6 is an explanatory diagram showing the relationship between the frame rod current, the lower threshold value, and the cancellation time ⁇ t CAN.
  • FIG. 7 is an explanatory diagram of an example of flame detection of a wrench by a flame rod.
  • FIG. 8 is a block diagram of a fan air volume control configuration during a combustion operation after ignition according to the present invention.
  • FIG. 9 is an explanatory diagram of another example of the fan air volume control data.
  • FIG. 10 is an explanatory diagram of an example of setting an upper threshold value and a lower threshold value of a flame rod current.
  • FIG. 11 is an explanatory diagram of an example of detecting generation of a negative pressure and release of a negative pressure in a room based on a change amount of a flame rod current.
  • FIG. 12 is an explanatory diagram of an example in which the generation of a sudden negative pressure in a room is detected based on a sudden drop change amount of a frame rod current.
  • FIG. 13 is a flowchart of an operation of detecting a negative pressure state in a room based on the CO concentration and performing air volume control.
  • FIG. 14 is a flowchart of the operation of detecting the negative pressure condition in the room by the flame rod current and controlling the air volume.
  • FIG. 15 is a block diagram showing an embodiment of the second invention.
  • FIG. 16 is a model diagram showing a phenomenon in which an abnormal combustion state due to insufficient air can be detected based on a flame rod current value.
  • FIG. 17 shows the fan air volume control data at normal time and the fan air volume control data at negative pressure.
  • FIG. 7 is a graph showing an example of fan air volume control data at the time of ignition set based on FIG.
  • FIG. 18 is a block diagram showing an embodiment of the second invention.
  • Fig. 19 is a graph showing an example of the fan air flow control data of a plurality of stages and the fan air flow control data at the time of ignition set based on the respective fan air flow control data.
  • FIG. 20 is a flowchart of an operation example of detecting a negative pressure state in a room based on the CO concentration and performing fan rotation control.
  • FIG. 21 is a graph showing an example of standard value data of a frame rod current value.
  • FIG. 22 is a block diagram showing an embodiment of the third invention.
  • FIG. 23 is a graph showing an example of the fan rotation control data.
  • FIG. 24 is a graph showing an example of a change in the indoor air pressure when the combustion capacity is changed to decrease when the indoor is in a negative pressure state.
  • FIG. 25 is a block diagram of a main part of an embodiment of the fourth invention.
  • FIG. 26 is a time chart showing the relationship between the combustion state of the combustion device, the CO detection operation state of the CO sensor, and the C • monitoring state in the embodiment of the fourth invention.
  • FIG. 27 is a flowchart showing the operation of the embodiment of the fourth invention.
  • FIG. 28 is a flowchart following FIG.
  • FIG. 29 is a flowchart following FIG.
  • FIG. 30 is an explanatory diagram showing a configuration of a water heater according to the fifth embodiment of the invention o
  • FIG. 31 is a block diagram showing a circuit configuration of a water heater according to an embodiment of the fifth invention.
  • FIG. 32 is a flowchart showing a flow of operation performed by the water heater according to the embodiment of the fifth invention.
  • FIG. 33 is an explanatory diagram showing the number of rotations of the combustion fan with respect to the amount of gas combustion for each operation mode.
  • FIG. 34 is a diagram showing a combustion fan performed by the water heater according to the fifth embodiment of the present invention after the combustion is stopped. 6 is a flowchart showing drive control of the fan.
  • FIG. 35 is a side view showing a chamber room provided in the appliance case of the combustion apparatus according to the sixth embodiment of the present invention.
  • FIG. 36 is a front view showing a chamber room provided in an appliance case of the combustion apparatus according to the sixth embodiment of the present invention.
  • FIG. 37 is a rear view showing a partially cutaway chamber chamber provided in the appliance case of the combustion apparatus according to the sixth embodiment of the present invention.
  • FIG. 38 is a plan view showing a chamber room provided in the appliance case of the combustion apparatus according to the sixth embodiment of the present invention.
  • FIG. 39 is an exploded perspective view showing a combustion device according to an embodiment of the sixth invention.
  • FIG. 40 is an enlarged front view showing a check valve provided at an exhaust inlet of a chamber constituting a combustion apparatus according to an embodiment of the sixth invention.
  • FIG. 41 is an enlarged side view showing a main part of the check ring.
  • FIG. 42 is an enlarged front view showing a guide member that supports a check valve that constitutes a combustion device according to an embodiment of the sixth invention.
  • FIG. 43 is a side view showing, on an enlarged scale, a guide member that supports a check ring constituting a combustion device according to an embodiment of the sixth invention.
  • FIG. 44 is an enlarged perspective view showing an exhaust sensor and its sensor case that constitute the combustion device according to the sixth embodiment of the present invention.
  • FIG. 45 shows a modification in the case where the negative pressure state in the room and its release are detected by the frame rod current of the seventh invention.
  • FIG. 46 is a schematic circuit diagram for supplying a voltage V in to the flame rod electrode pair.
  • FIG. 47 is a diagram illustrating a correction value ⁇ ⁇ ⁇ ⁇ for the frame rod current with respect to the variation ⁇ of the input voltage V in.
  • FIG. 48 is a diagram showing the flame rod current with respect to the combustion capacity.
  • FIG. 49 is a diagram showing that the actual frame rod current 712 is delayed with respect to the gas amount control command.
  • FIG. 50 is a diagram for explaining a delay time in detecting whether a negative pressure state or a negative pressure release is performed according to a change in the frame rod current.
  • Fig. 51 is a diagram showing the relationship between the proportional valve opening and the time when the combustion capacity is changed.
  • FIG. 2 shows a mechanical configuration of a combustion apparatus according to an embodiment of the present invention.
  • the combustion device of the present embodiment relates to a water heater, and a main unit 4 of the water heater is housed in an appliance case 3.
  • the appliance case 3 is provided with an air inlet 5 from which air is guided to an air inlet 6 of the main body 4 through a filter (not shown).
  • the main body 4 has a combustion chamber 7, and a lower part of the combustion chamber 7 is provided with a parner 8, such as a semi-bunsempana, which burns using primary air and secondary air.
  • a gas passage 10 is connected to the gas passage 10, and fuel gas is supplied to the burner 8 through the gas passage 10.
  • the gas passage 10 is provided with solenoid valves 11 and 12 for opening and closing the passage and a proportional valve 13 for controlling the amount of gas supplied to the parner 8 by the amount of valve opening.
  • the proportional valve 13 is controlled by the controller 14 to control the valve opening amount (gas supply amount), that is, the amount of combustion heat (combustion capacity) of the panner 8 according to the magnitude of the valve opening drive current applied. It is of a configuration.
  • an ignition plug 15 for igniting the wrench 8 and a flame rod 16 for detecting a flame of the wrench 8 are provided in the vicinity of the wrench 8, an ignition plug 15 for igniting the wrench 8 and a flame rod 16 for detecting a flame of the wrench 8 are provided.
  • the frame port 16 is installed at a position where the internal flame of the flame generated in the wrench 8 comes into contact with the flame rod 16.
  • a hot water heat exchanger 18 is provided on the upper side of the combustion chamber 7, and a water supply pipe 20 is connected to an inlet of the hot water heat exchanger 18, and a hot water is supplied to an outlet of the hot water heat exchanger 18.
  • Tube 21 connected Have been.
  • the hot water supply pipe 21 is connected to an external pipe.
  • the external pipe is led to a desired hot water supply place such as a kitchen, and a hot water supply pipe (not shown) is provided at an outlet side.
  • 22 is a feedwater flow rate sensor that detects the flow rate of the feedwater
  • 23 is a feedwater temperature J3 ⁇ 4 sensor that detects the feedwater temperature
  • 24 is a tap temperature sensor that detects the tap water temperature
  • 25 is a water flow control valve that controls the flow rate of the feedwater.
  • a combustion fan 26 for supplying and discharging the burner.
  • the rotation of the combustion fan 26 is detected by a fan rotation detection sensor 27.
  • a CO sensor 28 is provided in the exhaust passage on the downstream side of the combustion fan 26, and the CO sensor 28 detects the CO concentration in the exhaust gas.
  • an exhaust duct is connected to the outlet side of the exhaust passage 30, and the exhaust gas is exhausted to the outside as shown in FIG. .
  • a remote controller 31 is connected to the controller 14 via a signal.
  • the remote controller 31 includes a temperature setting device for setting the hot water temperature, and a display section for displaying appropriate information (for example, a hot water temperature and an error signal) from the control device 14.
  • FIG. 3 shows a main part of the control device 14 according to the first invention.
  • a combustion control unit 32 In the first embodiment of the control configuration, as shown by a solid line, a combustion control unit 32, an air volume control unit 33, It is configured to include a storage unit 34, an air flow control data monitoring storage unit 35, and an ignition retry control unit 36.
  • This control device 14 is preferably constituted by, for example, a microcomputer.
  • the combustion control unit 32 is configured to correct a difference between a feedforward heat amount required to increase the feedwater temperature to a set hot water temperature set by the remote controller 31 or the like and a difference between the hot water supply temperature (outlet water temperature) and the set hot water supply temperature.
  • the combustion control unit 32 is provided with combustion control data indicating the relationship between the proportional valve opening and the combustion heat amount (combustion capacity) as shown in FIG. 5, and the combustion control unit 32 determines the maximum combustion heat amount Ma
  • the proportional valve opening is controlled within the range of the combustion capacity between X and the minimum combustion heat amount Min. For example, when the amount of combustion heat obtained by the calculation is P, the proportional valve opening is obtained as Q from the control data in FIG. 5, and the proportional valve current to the proportional valve 13 is calculated so that the proportional valve opening Q is obtained. It controls to supply.
  • the proportional valve opening corresponding to the minimum combustion heat is 0%
  • the proportional valve opening corresponding to the maximum combustion heat is 100%
  • the proportional valve opening is 0%.
  • a control mode is adopted in which control is performed within a range of 100% to obtain a combustion heat amount within the range of the minimum combustion heat amount and the maximum combustion heat amount.
  • the air volume control unit 33 is provided with air volume control data as shown in FIG.
  • the air volume control data is stored in the data storage unit 34.
  • the horizontal axis indicates the proportional valve opening (combustion heat), and the vertical axis indicates the fan rotation speed (fan blowing capacity, hereinafter simply referred to as fan air flow).
  • the data in A in Fig. 4 is the standard fan airflow control data for normal combustion operation, and the data in C is the first stage airflow fan shifted in the direction of increasing the fan airflow from this standard fan airflow control data.
  • B is the air flow control data for the second stage, and B is the air flow control data for the second stage which increases the fan air volume even more than the fan air flow control data for the first stage.
  • the minimum input minimum proportional valve opening
  • changing the fan air volume control data from B to E greatly changes the fan rotation speed, whereas the fan input at the maximum input.
  • the number of revolutions is not changed much.
  • Pana originally has the maximum input ( It uses a burner that can burn at the rated input) and controls the air flow so that it does not disappear even if the fuel is reduced.
  • the lines are parallel, but in the present application, the distance between the lines increases as the proportional valve opening decreases, and the distance between the lines increases as the proportional valve opening increases. (Each line does not have to converge at one point, and the imaginary line of each line intersects somewhere in the large proportional valve opening direction.)
  • the air volume control unit 33 uses the control data of A to determine a fan rotation speed (fan air volume) corresponding to the proportional valve opening so that the fan rotation speed (fan air volume) can be obtained.
  • the rotation of the combustion fan 26 is controlled.
  • an air volume corresponding to the combustion heat amount (gas supply amount) is obtained, and the combustion control in which the combustion heat amount and the air volume match is achieved.
  • the air volume control unit 33 has a control function for switching the fan air volume control data to the air volume increasing direction when the CO concentration exceeds a predetermined reference value based on the C ⁇ detection concentration of the CO sensor 28. I have.
  • the fan air volume control data of A and C are classified as control data on the weak negative pressure side
  • the fan air flow control data of B, D, and E are classified as control data on the strong negative pressure side.
  • the term "low negative pressure side” means a state of the indoor pressure when the range hood ⁇ ventilation fan 2 is not activated, and when the combustion fan 26 is rotated in a closed state of the room, the indoor air Is discharged, so the room becomes slightly negative pressure, so we use the term weak negative pressure side.
  • the strong negative pressure side is a state of the indoor pressure when at least one of the range hood and the ventilation fan 2 is in the activated state, that is, the indoor pressure is in a negative pressure state stronger than the weak negative pressure state. That means.
  • the air flow control data monitoring and storage unit 35 monitors in a time series which of the fan air flow control data A to E shown in FIG. 4 is being used during the combustion operation, and records the data.
  • the initial ignition control unit 39 controls the ignition by driving the spark plug 15 at the beginning of the combustion operation when the combustion operation is started.
  • Section 39 stores the standard fan air volume control data A Ignition is performed as specified by the airflow control data, or the airflow control data monitoring storage unit
  • the ignition operation is controlled by designating the same fan airflow control data used at the end of the previous combustion operation.
  • This initial ignition operation is performed in cooperation with the combustion control unit 32 and the air volume control unit 33, and uses the air volume control data specified by the initial ignition control unit 39 to reduce the startup gas supply amount during ignition.
  • the combustion fan is rotated at a fan speed (fan flow rate) corresponding to the proportional valve opening, and in this state, sparks are blown by the ignition plug 15 to the fuel gas ejected from the panner 8 to ignite.
  • the ignition retry control unit 36 detects the frame rod current from the frame rod 16, detects whether or not the initial ignition performed by the initial ignition control unit 39 has succeeded. Control the try operation.
  • the ignition retry control unit 36 is provided with classification information of a plurality of fan air volume control data shown in FIG.
  • the fan air flow control data of A and C are classified (grouped) as the weak negative air flow control data, and the fan air flow control data of B, D, and E are output as the strong negative air flow. It is classified (grouped) as control data overnight.
  • the strong negative pressure side air volume control data B, D, and E indicate that when the ventilation fan 2 and the range hood are driven and the room is in a negative pressure state, the air volume increases to compensate for the insufficient air volume of the combustion fan 26 due to the negative pressure in the room.
  • the air flow control data A and C indicate that the ventilation fan 2 and the range hood are in a stopped state, and that the indoor pressure is slightly reduced by the rotation of the combustion fan 26. This is control data for supplying an appropriate amount of air required for combustion in a state where the negative pressure has been eliminated, for example, when the air pressure has been reduced or the window has been opened.
  • the ignition retry control unit 36 determines that the initial ignition has failed, It is determined whether the fan air volume control data used at the time of the initial ignition is the control data on the strong negative pressure side or the control data on the weak negative pressure side, and when the strong negative pressure side air flow control data B, D, E, the room is Since the air flow control data on the strong negative pressure side was used even though the vacuum was not negative, it was determined that the ignition flame had blown out due to excessive air flow.
  • the ignition operation is performed by specifying the first-stage air-flow-increase fan airflow control data C, which is the fan airflow control data on the weak negative pressure side on the opposite side from the fan airflow control data.
  • the range hood ⁇ ventilation fan 2 is driven and the room is at a high negative pressure.
  • the re-ignition (ignition retry) operation is controlled by specifying the fan air volume control data B for the second stage air volume up, which is the fan air volume control data on the high / negative pressure side different from the control data.
  • the initial ignition when the initial ignition has failed, it is determined whether the fan air volume control data used at the time of the initial ignition belongs to the strong negative pressure side or the weak negative pressure side. Since reignition is performed using either the first stage air volume control fan air volume control data C or the second stage air volume fan air volume control data B of a different classification from the initial ignition. However, when the initial ignition fails due to excessive air volume, re-ignition uses the fan air volume control data C for increasing the first stage air volume, which is the smaller air volume, and the re-ignition is larger than when the initial ignition fails due to insufficient air volume.
  • the ignition retry operation is performed using the fan air flow control data B for the second-stage air flow increase, the air flow that can be ignited without insufficient or excessive air flow is supplied during re-ignition. Re-ignition operations The ignition flame can be reliably formed by the This enables ignition retry control.
  • the control configuration of the second embodiment is provided with a time measuring means 37 such as a clock mechanism and a timer as shown by a broken line in FIG.
  • the ignition retry control unit 36 is provided with a judgment reference time, and the ignition retry control unit 36 detects the time from when the combustion operation is stopped by using a time measuring unit 37, and from the time when the combustion is stopped, the judgment reference time is used.
  • the initial ignition is performed by the initial ignition control unit 39 using the fan air volume control data used when the combustion was stopped in the previous combustion operation.
  • the combustion operation is restarted after the judgment reference time has elapsed since the previous combustion stop, the standard fan air volume control data A for normal combustion operation or the fan air volume control data C for the first stage air volume increase is used. Allow the initial ignition to occur.
  • Other configurations are the same as those of the first embodiment.
  • the initial operation performed using the fan air volume control data A or C is performed.
  • the re-ignition is controlled by specifying the fan air flow control data B on the opposite side of the classification of the fan air flow control data A and C as in the first embodiment. It is.
  • a value of, for example, 5 minutes and 30 seconds is given as the determination reference time. Normally, when the combustion operation is restarted within this determination reference time, the previous combustion was stopped. Therefore, when the combustion operation is restarted within the reference time, the fan air volume control data that was selected and used as the optimum combustion state data during the previous combustion operation was high. In the evening, the initial ignition is performed to increase the success rate of the initial ignition.
  • a fan air volume control data switching unit 38 is provided to switch and set the fan air volume control data according to the degree of indoor negative pressure.
  • the method of detecting the fan airflow control data used at the end of the previous combustion operation by the airflow control data monitoring storage unit 35 has been changed, and the other configuration is the same as that of the second embodiment. is there.
  • the fan airflow control data is switched to the control data on the fan airflow up side, and the flame load current falls below the lower threshold.
  • the fan air volume control data is converted to the fan air volume down side, that is, the original fan air volume control data before the fan air volume is increased. It has a configuration to switch setting.
  • the air volume control unit 33 controls the fan air volume during the combustion operation using the fan air volume control data switched and set by the fan air volume control data switching unit 38.
  • a combustion stop command is output from the combustion control unit 32 and the solenoid valves 11 and 12 are closed by the fan air flow control data switching unit 38 switching setting operation of the fan air flow control data.
  • the flame rod current passes downward through the lower threshold, and the combustion is stopped at a level lower than the lower threshold.
  • the fan air volume control data switching unit 38 Since it is erroneously determined that the negative pressure state has been released and the fan air volume control data is switched to the direction in which the fan air volume decreases, the air volume control data monitoring storage unit 35 is used when the combustion is stopped.
  • the fan air volume control data the fan air volume control data set to be switched to the air volume down direction by the fan air volume control data switching unit 38 is stored as the fan air volume control data used at the end of the combustion operation.
  • the initial ignition control unit 39 is used at the end of the previous combustion operation.
  • the fan air volume control data that was mistakenly stored by the air volume control data monitoring and storage unit 35 was designated as the fan air volume control data at the time of initial ignition. The problem is that the probability increases.
  • the airflow control data monitoring storage unit 35 is provided with a cancellation time ⁇ t CAN as shown in FIG.
  • the cancellation time ⁇ t CAN is given by a time value greater than the time ⁇ tF from the time when the flame rod current crosses the lower threshold to the time when combustion stops when combustion stops, and Specifically, A t F is measured by an experiment or the like, and a value larger than the A t F is given as the value of the cancel time t CAN.
  • the airflow control data monitoring and storage unit 35 stores the flame load current at the time of combustion stop in a time-series manner, and cancels the time ⁇ t CAN from the time of combustion stop at which the flame load current level value P FIN at the time of combustion stop is reached.
  • the air flow control data that was used just before this time that is, the fan air flow control data that was used before the flame rod current crossed the lower threshold value downward when combustion stopped It is stored as the fan air volume control data that has been used.
  • the fan air volume control data before the switching setting is correctly stored as the fan air volume control data used when the combustion was stopped by the air volume control data monitoring storage unit 35, the initial ignition control unit is used when the next combustion restarts.
  • correct fan air volume control data is specified as the fan air volume control data used at the time of the previous combustion stop, and the initial ignition operation is performed, so that the probability of success of the initial ignition operation can be increased, and ignition failure Thus, it is possible to perform initial ignition with less noise.
  • the fan air volume control data of X 0 corresponding to the fan air volume control data A of FIG.
  • FIG. 8 shows a control configuration of the combustion fan 26 after the ignition.
  • the fan air volume control unit 33 controls the fan air volume of the combustion fan 26 in accordance with the fan air volume control process. Is provided.
  • the fan air volume control data switching control unit 40 receives the signals from the CO sensor 28 and the frame rod 16 and converts the fan air volume control data used by the air volume control unit 33 into the CO concentration detected by the CO sensor 28, It switches and controls the fan air volume control according to the negative pressure condition of the indoor combustion environment detected by the current of the frame opening 16, and has one or more of the following functions.
  • the first function is a function of setting the fan air flow control data to be gradually switched to the fan air flow up side as the CO concentration detected by the CO sensor 28 increases.
  • An operation example of this function will be described with reference to the flowchart of FIG. 13.
  • step 101 it is determined whether or not the CO concentration is equal to or higher than the upper limit.
  • the fan air flow control data is determined in step 102. Is increased by one level.
  • the fan air volume control data shown in FIG. 9 is described as an example.
  • the X in the flowchart is the value of X in each fan air volume control data shown in FIG. O corresponds to
  • the upper limit of the C ⁇ concentration may be given as the time to reach the dangerous CO concentration when a person is exposed to the atmosphere having the CO concentration detected by the CO sensor 28, or It may be given at a high CO concentration threshold, or assuming that a person has been exposed to the atmosphere with the CO concentration detected by the CO sensor 28, the C0 concentration of hemoglobin in the blood is determined, and the unit time
  • the ratio of the unit time t to the dangerous arrival time T of the moglobin CO concentration in the blood calculated for each t may be given by the upper limit value of the integrated value of the ZT.
  • step 107 combustion is performed at a fan rotation speed (fan airflow) corresponding to the combustion amount (combustion heat amount) based on the fan airflow control data in which the airflow is increased by one stage in step 102. Rotate the fan and register the value of X as the negative pressure intensity in the room in step 110.
  • step 111 it is determined whether an ON signal is supplied from the feedwater flow sensor 22. When the ON signal is supplied, the operation from step 101 is repeated. On the other hand, when an OFF signal is output from the feedwater flow sensor 22, it is determined that the hot water supply ⁇ has been closed, and the combustion is stopped.
  • step 112 the elapsed time from when the combustion was stopped is measured using a timer or the like, and it is determined whether or not the time is within 10 minutes after the stop of the combustion.
  • the combustion operation is restarted within 10 minutes after stopping the combustion, it is estimated that the negative pressure state in the room is the same as the value of X registered in step 110, and the fan airflow of the registered value of X is assumed.
  • the fan air volume control data is selected and specified according to the negative pressure in the room, eliminating the shortage of air supply due to negative pressure in the room and performing good combustion operation.
  • the second function of the fan air volume control by the fan air volume control data switching control unit 40 is to detect a frame rod current output from the frame rod 16 and determine the degree of negative pressure in the room based on the frame rod current. This function switches and sets fan air volume control data. That is, as shown in FIG. 10, the proportional valve is opened in the data storage The relationship data between the temperature (combustion heat) and the flame rod current is given as a threshold value.
  • the fan airflow control data is gradually increased toward the fan airflow increasing side.
  • This function controls the fan airflow control data to be switched stepwise to the fan airflow down side as the degree of negative pressure decreases.
  • a lower threshold value is applied to the lower side of the frame rod current, and an upper threshold value is applied to the upper side.
  • the lower threshold is given by the lower fixed threshold and the lower variable threshold
  • the upper threshold is given by the upper variable threshold and the upper fixed threshold.
  • the lower thresholds may be given by lower fixed thresholds, lower variable thresholds, values, or proportional values.
  • the lower fixed threshold value and the lower variable threshold value may be selectively used according to the category of the valve opening.
  • the upper threshold value may be given by the upper fixed threshold value or the upper variable threshold value.
  • the upper fixed threshold value and the upper variable threshold value are set according to the division of the proportional valve opening. You can use different values.
  • the fan air volume control data switching control unit 40 takes in the frame rod current from the frame rod 16, and when the frame rod current exceeds the upper threshold value, the room enters a negative pressure state. When the flame load current falls below the lower threshold (exceeds below), the negative pressure in the room decreases in the release direction. It is determined that the air flow has changed, and the fan air flow control data is switched to the fan air flow down side.
  • FIG. 14 is a flowchart showing the operation of the second function. That is, in step 201, it is determined whether or not the frame rod current has exceeded the upper threshold value.
  • the fan airflow control data is raised by one step to the fan airflow increase side, and step 203
  • the fan air flow control WP This is to switch the setting to one step fan air flow down side.
  • the up / down switching operation of the fan air volume control data is the same as the operation shown in FIG. 13, and the same operation is denoted by the same step number, and redundant description is omitted.
  • the present inventor has experimentally verified the relationship between the degree of the negative pressure in the room and the flame rod current.
  • the combustion flame expands upward due to insufficient air supply, and the flame increases.
  • the magnitude of the rod current increases and the negative pressure in the room is released, the shortage of air supply is resolved, and the flame shrinks to its original state, causing a phenomenon in which the flame rod current decreases.
  • the operation of this second function is that when the frame rod current exceeds the upper threshold, a negative pressure in the room is generated and the frame port current falls below the lower threshold.
  • the pressure exceeds, it is judged that the negative pressure has been released or the degree of negative pressure has decreased, and the fan air volume control data is switched and set according to the degree of negative pressure in the room. Good combustion operation by controlling fan air volume It is intended to guarantee.
  • a third function of the fan air volume control configuration by the fan air volume control data switching control unit 40 is a function of detecting a negative pressure state and a negative pressure release state in the room based on a change amount of the frame rod current.
  • (A) in Fig. 11 is to detect the generation of negative pressure in the room based on the amount of increase in the frame rod current and switch the fan airflow control data to the fan airflow up side, and set the data to the data storage unit 34.
  • the data of the change reference value F thl (for example, 1.1 A) and the reference time T thl (for example, 0.6 seconds) given to the rise change reference value are given.
  • FIG. 11 (b) shows the function of detecting the release of the negative pressure in the room based on the amount of decrease in the frame rod current.
  • the data storage section 34 stores the reference value F th2 for the decrease in frame rod current and this decrease.
  • the reference time T th2 given to the change reference value is given, and the fan air flow control data switching control unit 40 determines that the amount of decrease in the flame rod current is within the time of the judgment time T th2,
  • the room Judgment is made that the negative pressure condition in () has been released (or changed in the negative pressure decreasing direction), and the fan air volume control data X is switched to the fan air volume down side ((X-1) side).
  • the data storage unit 34 stores the reference value F thO of the falling change of the frame rod current (for example, 0.7 mA data and the time width longer than the determination time T th2 shown in FIG. 11B).
  • a short minute setting time AT th (for example, 0.1 second) is given, and the fan air volume control data overnight switching control unit 40 determines that the frame rod current falls within the minute setting time AT th.
  • Fan air volume to eliminate shortage His data X is to switch setting on the fan air volume Appu side ((X + 1) side).
  • the air volume control unit 33 uses the switched fan air volume control data to set the combustion fan. 26 air volume control is performed.
  • the fan air volume control data switching control unit 40 is provided with one or more of the above-described functions to set the fan air volume control data according to the negative pressure condition in the room. In the low combustion capacity range where the (proportional valve opening) is below the specified value of the control range (for example, the proportional valve opening is 30%), the combustion performance is more easily affected by the negative pressure in the room.
  • the flame rod current instantaneously responds to the deterioration of combustion, and the change in the flame rod current detects the deterioration of combustion quickly, preventing the misfiring by quickly controlling the air flow in the direction of improving combustion. can do.
  • Flame rods on the other hand, have a range of flame rod current that can detect combustion deterioration with high sensitivity.If the flame rod current deviates from this range, the detection sensitivity of combustion deterioration decreases.However, in this range, combustion deterioration is detected by the CO sensor.
  • the indoor pressure can be detected over the entire range of combustion heat control. It is possible to accurately detect the negative pressure condition of the combustion environment, and to control the fan air volume more accurately according to the degree of negative pressure in the room.
  • the present invention is not limited to the above embodiments, and various embodiments can be adopted.
  • a water heater was described as an example of a combustion device.
  • the combustion device of the present invention is not limited to a water heater using gas or oil as a fuel, for example, a bath kettle, a heating device, a cooling device, and a cooling / heating device. It can be applied to various combustion devices such as air conditioners and fan heaters.
  • the combustion fan 26 is provided on the exhaust side and is of a suction type.
  • the combustion fan 26 may be provided on the lower side of the burner 8 and may be of an extrusion type.
  • the fan air volume control data shown in FIG. 3 may be given by the relationship between the proportional valve opening and the fan speed, or may be given by the relationship between the proportional valve opening and the fan air volume.
  • an airflow sensor for example, a wind speed sensor
  • a control mode is adopted to control the fan speed so that the detected airflow reaches the target airflow corresponding to the proportional valve opening.
  • the first-stage air-flow-increase fan air volume control data which makes it possible to reliably perform ignition when the room is under a weak negative pressure
  • the second stage airflow control fan airflow control data in which the fan airflow is increased more than the first stage airflow fan airflow control data capable of reliably performing ignition in a state is provided. If the initial ignition operation at the start of combustion has failed, it is determined whether the fan air volume control data used in the failed initial ignition operation belongs to the weak negative pressure side or the strong negative pressure side. When the initial ignition operation is failed using the fan airflow control data on the weak negative pressure side, it is determined that the indoor negative pressure state is a strong negative pressure state.
  • Re-ignition is performed by specifying the fan air volume control data for increasing the stage air volume.
  • the initial ignition fails using the high negative pressure side fan airflow control data
  • the negative pressure state is almost canceled in the room, and in this state, the high negative pressure side fan airflow control data is used.
  • the fan air flow control data for the first-stage air flow up on the weak negative pressure side is specified and re-ignition is performed. Therefore, even if the initial ignition fails using either the high-pressure side or the low-pressure side fan airflow control data, the fan airflow control data on the side that provides the appropriate airflow for ignition is specified at the next reignition.
  • the flame of ignition can be formed stably by the single reignition operation, and the ignition can be reliably performed without repeating the reignition operation many times.
  • the accuracy of the ignition control can be improved, and the reliability of the ignition control can be significantly improved.
  • the air flow control data monitoring storage unit is provided to monitor and store the fan air flow control data used at the time of the previous combustion stop, and to perform the combustion within the determination reference time from the combustion stop.
  • the initial ignition is performed using the fan air volume control data at the time of the previous combustion stoppage monitored and stored by the air volume control data monitoring storage unit.
  • the initial ignition will be performed in the same negative pressure in the room as in the previous combustion stop or in the environment where the negative pressure is released.
  • the fan air volume control data that was used the probability of successful initial ignition was increased, thereby reducing initial ignition failures and enabling initial ignition to efficiently form an ignition flame. The effect is obtained.
  • the first embodiment of the present invention has a configuration in which the fan air volume control data is switched to the air volume down side when the detection signal level of the flame detection sensor falls below a predetermined threshold value.
  • a predetermined threshold value Gives a cancellation time longer than the time required for the detection signal level of the flame detection sensor to cross the threshold level downward and drop to the combustion stop level, and only for the cancellation time after the combustion stop point.
  • the configuration is such that the fan air volume control data used at the time of the previous combustion is detected as the fan air volume control data used at the time of stopping the combustion. Therefore, even if the detection signal level of the flame detection sensor crosses the threshold value when the combustion is stopped and the fan airflow control data is switched to the airflow downside, the fan airflow control data on the airflow downside is compared with the previous combustion airflow.
  • the first embodiment of the present invention detects the degree of negative pressure in the room based on the CO concentration detection signal of the CO sensor and the frame rod current output from the frame rod, and outputs the fan air volume control data. According to the degree of indoor negative pressure, the fan air volume control data is switched so that the air flow increases when the indoor negative pressure is large, and the air flow decreases when the indoor negative pressure is released (or decreases).
  • the control unit is provided.
  • the air flow control data of the fan is replaced with different data, and then the ignition control is performed again.
  • the air flow control data at the time of ignition at the start of combustion is compared with the air flow control data of the normal state and the air flow control data of the negative pressure state when the combustion is stopped. Use the air volume control data for ignition in the middle area.
  • the combustion stop time is a negative pressure drop state
  • the air flow control data for ignition in the intermediate region between the air flow control data in the normal state and the air flow control data in the negative pressure state is used.
  • the ignition can be reliably performed regardless of whether the room is in a normal pressure state or a negative pressure state at the time of ignition. After the ignition, it is detected whether or not the room is in a negative pressure state, and the combustion control is performed by switching to the optimal air volume control data.
  • the water heater system shown in this embodiment is configured as described above, and this water heater can be installed in a room such as a kitchen or a washroom.
  • This embodiment is characterized by the control configuration of the appliance operation, and is applicable to a room in which the water heater is installed in a normal standard mode or in a negative pressure mode which is a negative pressure state more than the standard mode.
  • an ignition operation control structure that can achieve point ignition at the time of ignition from both the standard mode state and the negative pressure mode state. The characteristic control configuration will be described below.
  • FIG. 15 shows a characteristic control configuration in the first embodiment of the second invention.
  • the water heater control device 230 includes a combustion control unit 35, a data storage unit 236, an ignition air volume control unit 238, and a control data transfer control unit 40. It has a negative pressure detecting means 24 1 and a control data switching control section 24 4.
  • a sequence program for operating the appliance is given in advance to the combustion control unit 235, and the combustion control unit 235 fetches information of the remote controller 31 and sensor output information of various sensors, Based on the acquired information, control of the appliance operation is performed as described above.
  • the negative pressure detecting means 2 41 is based on the CO concentration in the exhaust gas detected and outputted from the CO sensor 28 and the flame rod current value detected and outputted from the flame rod electrode 16, and the water heater is provided. It detects a negative pressure condition in the installed room and has one or more of the following functions.
  • the basic function is to detect the C0 concentration detected by the C0 sensor 28, focusing on the fact that the C ⁇ concentration in the exhaust gas increases when the combustion state deteriorates due to lack of air due to the negative pressure in the room.
  • a predetermined dangerous value for example, 200 ppm
  • the dangerous value of the CO concentration is determined when the person is exposed to the atmosphere with the CO concentration detected by the CO sensor 28.
  • the time to reach the dangerous CO concentration may be given as a risk value, or may be given as a high C ⁇ concentration threshold, or if a person is in an atmosphere with a C ⁇ concentration detected by the CO sensor 28 Calculate C0 concentration of moglobin in blood assuming exposure, and calculate per unit time t In which it may be given at risk value of the integrated value of the ratio t ZT of the unit time t with respect to the danger arrival time T of the hemoglobin C 0 concentration to the blood to be.
  • the first additional function of the negative pressure detection by the negative pressure detecting means 2441 is to detect the frame rod current output from the frame rod electrode 16 and to generate the negative pressure in the room by the frame rod current. It is a function to detect. That is, as shown in FIG. 10, the data storage section 36 is provided with the relation data of the combustion capacity and the flame rod current as a threshold value, and the function of detecting the degree of the negative pressure in the room based on the relation data is provided. is there.
  • the relationship data shown in FIG. 10 gives a lower threshold to the lower side of the flame rod current and an upper threshold to the upper side. In the example of Fig.
  • the lower threshold is given by the lower fixed threshold, the value and the lower variable threshold, the value is given, and the upper threshold is given by the upper variable threshold and the upper fixed threshold.
  • the upper and lower fixed threshold values are given as fixed values, the values of which do not fluctuate depending on the combustion capacity, and the upper and lower variable threshold values increase as the combustion capacity increases.
  • the lower thresholds are given as values fixed in the lower direction, these lower thresholds may be given as lower fixed thresholds or values.
  • the lower fixed threshold and the lower variable threshold may be selectively used according to the category of the combustion capacity.
  • the upper threshold value may be given by the upper fixed threshold value or the upper variable threshold value, and the upper fixed threshold value and the upper variable threshold value are determined according to the combustion capacity. You can use them properly.
  • the negative pressure detecting means 2 41 takes in the frame rod current from the frame rod electrode 16 when the first additional function is operated, and when the frame rod current exceeds the upper threshold value, the indoor pressure becomes negative. When the flame load current falls below the lower threshold (exceeds below), it is detected that the negative pressure in the room has changed in the release direction. is there.
  • the present inventor has experimentally verified the relationship between the degree of negative pressure in the room and the flame load current.
  • a lack of air supply causes a good combustion state.
  • the combustion flame extends upward as shown in Fig. 16 (b), and the electrical resistivity of the inner flame 46 of the combustion flame is lower than that of the outer flame 45. Therefore, when the magnitude of the frame rod current increases and the negative pressure in the room is released, the shortage of air supply is resolved, and the flame shrinks to its original state and the flame rod current decreases.
  • the first additional function takes advantage of this fact, and as described above, a negative pressure in the room is generated when the flame load current exceeds the upper threshold. Negative pressure is released when flame load current exceeds the lower threshold. Are those degree of negative pressure is detected as those lowered.
  • the second additional function in indoor negative pressure detection is a function of detecting the indoor negative pressure state and negative pressure release state based on the amount of change in the flame load current.
  • (A) in FIG. 11 detects the occurrence of a negative pressure in the room based on the amount of increase in the frame rod current.
  • the data storage section 236 stores the reference value of the increase change F thl (for example, 1.1 il k).
  • Fig. 11 (b) shows the negative pressure solution in the room based on the amount of decrease in the flame rod current.
  • the data storage section 236 is provided with a reference value F th2 of the fall of the frame rod current and a reference time T th2 given to the reference value of the fall.
  • the negative pressure detecting means 2 41 releases the negative pressure condition in the room (or negative pressure) when the amount of decrease in the flame rod current exceeds the reference value F th2 within the reference time T th2. (Change in the decreasing direction) is detected.
  • the third additional function in negative pressure detection is to detect a sudden negative pressure change in the room based on the amount of rapid decrease in flame load current as shown in FIG.
  • the data storage section 236 stores the data of the reference value F thO (for example, 0.7 A) of the falling change of the frame rod current and the reference time T th2 shown in FIG. 11B.
  • the data of the minute setting time AT th (for example, 0.1 second) with a narrow time width is given, and the negative pressure detecting means 2 41 1 reduces the frame rod current within the time of the minute setting time AT th.
  • the negative pressure detecting means 2 41 has one or more additional functions of the first, second and third additional functions in addition to the above basic functions. Captures the information of the combustion capacity from the combustion control section 235, and when the combustion operation is performed with a combustion capacity lower than a predetermined combustion capacity (for example, a combustion capacity of 30%), the above basic function is performed. And the additional function are combined to detect the negative pressure in the room, otherwise the basic function is used to detect the negative pressure in the room. .
  • a predetermined combustion capacity for example, a combustion capacity of 30%
  • the flame rod electrode has a range based on the relationship between the mounting position and the combustion capacity that can detect combustion deterioration with high sensitivity. If the combustion capacity deviates from this range, the detection sensitivity of combustion deterioration deteriorates, but high combustion Capacity range (for example, the combustion capacity shown in Figure 10 In the range of power X to 100%, the deterioration of combustion can be detected satisfactorily by the c ⁇ sensor, so that the combustion capacity is low (for example, the combustion capacity o to x shown in Fig. 10).
  • the data storage unit 236 stores the fan air volume control data R at normal time and the fan air volume control data T at negative pressure shown by the solid line in FIG.
  • the fan air volume control data R and T are data given in correspondence with the air volume of the combustion fan 2 corresponding to the combustion capacity (in this embodiment, the combustion capacity from a predetermined minimum combustion capacity to a maximum combustion capacity).
  • the fan air volume control data T at the time of the negative pressure is based on the negative pressure mode for performing good combustion when the negative pressure detecting means 241 detects a negative pressure in the room. This is a time for controlling the rotation, and the fan air volume control data R in the normal state is used for controlling the rotation of the combustion fan 26 in order to perform good combustion in the standard mode other than the negative pressure mode.
  • Each of the fan air volume control data R and T is obtained in advance by experiments, calculations, or the like.
  • the fan air volume control data T at the time of negative pressure is larger than the fan air volume control data R at the normal time.
  • the predetermined minimum combustion capacity is set to 0%, and as the combustion capacity increases, the combustion capacity increases so that the maximum value becomes 100%. Is replaced with
  • the control data switching control section 244 takes in the operation information of the combustion control section 235 and detects that the combustion control section 235 has issued a drive command for the combustion fan 266. However, when the detection information of the negative pressure detecting means 24 1 is taken in and a negative pressure state in the room is detected, according to the combustion capacity information of the combustion control section 235 and the fan air volume control data T at the time of the negative pressure. In the negative pressure mode, the rotation control of the combustion fan 26 is performed. In the other standard modes, the combustion fan 26 is controlled in the standard mode in accordance with the combustion capacity information of the combustion control section 235 and the normal fan air volume control data R. Perform rotation control.
  • the rotation of the combustion fan 26 is controlled based on the fan air volume control data T at the time of the negative pressure.
  • the fan airflow increases as compared to the rotation control of the combustion fan 26 according to the fan airflow control data at the time, so that the amount of air supplied to the burner 1 can be improved due to the negative pressure in the room. It is possible to suppress the decrease from the air amount, and it is possible to prevent the combustion state from being deteriorated due to the lack of air due to the negative pressure state in the room.
  • the burner 8 when the burner 8 is ignited, it is conceivable to control the rotation of the combustion fan 26 based on the fan air volume control data used when the previous combustion was stopped.
  • the room may transition from the standard mode to the negative pressure mode, or conversely, may transition from the negative pressure mode to the standard mode. If the mode shifts from the standard mode to the negative pressure mode while the combustion is stopped, the combustion is performed based on the normal fan air volume control data R at the time of ignition, even though the room is in the negative pressure mode. Since the rotation control of the fan 26 is performed, the fan airflow becomes smaller than the combustible fan airflow, and there is a possibility that the point ignition cannot be achieved due to a shortage of air.
  • the fan air volume control at the time of negative pressure at the time of ignition is performed even if the room is in the standard mode. Since the rotation control of the combustion fan 26 is performed based on the data T, the fan airflow may be larger than the combustible fan airflow, and the combustion flame may not be blown out to achieve the point ignition. . .
  • the configuration is such that spot ignition can be reliably achieved regardless of whether the room is in the standard mode or in the negative pressure mode.
  • the data storage section 236 stores fan air volume control data V at the time of ignition.
  • the fan air volume control data V at the time of ignition is based on the air volume range Xr of the combustion fan shown in Fig. 17 (i.e., combustion in the standard mode
  • the fan air volume range Xt that is, the fan air volume range that can be burned in the negative pressure mode
  • Fig. 17 where combustion is possible in the fan air volume control data T at negative pressure
  • the ignition air volume control unit 238 captures the operation information of the combustion control unit 235, and when it is detected that a command to start the rotation control of the combustion fan 26 at the time of ignition is issued based on the information, The rotation control of the combustion fan 26 is performed based on the fan air volume control data V at the time of ignition.
  • the control data transfer control section 240 has a built-in timer (not shown), and the operation information of the ignition air flow control section 238, the detection information of the negative pressure detecting means 241 and the frame rod electrode 1
  • the flame load current value detected and output from 6 is taken in, and the rotation of the combustion fan 2 at the time of ignition is controlled by the ignition air volume control unit 238, and after the combustion flame is detected based on the flame rod current value, If the combustion flame can be continuously detected based on the frame rod current value until the predetermined margin time elapses, it is determined that spot ignition has been achieved.
  • the control data transfer control unit 240 when the negative pressure state in the room is detected based on the information of the negative pressure detecting means 241, The fan air flow control data at the time of ignition is changed from V to the fan air flow control data at the time of negative pressure, and the rotation control of the combustion fan 26 is performed in the standard mode. Otherwise, the fan air flow control at the time of ignition is performed.
  • the rotation of the combustion fan 26 is controlled in the standard mode by shifting from the night V to the normal fan air volume control data R.
  • control data switching control unit 244 achieves the point ignition based on the operation information of the control data transfer control unit 240, and the control data transfer control unit 240 transfers the fan air volume control data.
  • the control data switching operation is performed after a predetermined period has elapsed after detecting that the control data has been detected. .
  • the fan air flow control data T at negative pressure is given, and the state of air pressure (combustion environment) in the room where the water heater is installed is determined.
  • the rotation of the combustion fan 26 is controlled based on the above-described normal fan air volume control data R, and the negative pressure mode, which is in a more negative pressure state than in the standard mode, is controlled.
  • the rotation of the combustion fan 26 is controlled based on the fan air flow control data T at the time of the negative pressure, when the combustion environment is in the negative pressure mode, the fan air flow at the time of the negative pressure is controlled.
  • the normal The fan airflow increases as compared with the rotation control of the combustion fan 26 according to R, and the fan airflow for good combustion can be obtained.
  • the deterioration of the combustion state due to the lack of air due to the negative pressure in the room can be reduced. Can be avoided.
  • the above-mentioned normal fan air flow control data scale and the fan air flow control data T at the time of negative pressure are provided, and the fan air flow control data V at the time of ignition are provided.
  • An ignition air volume control unit 238 that controls the rotation of the combustion fan 26 in accordance with the fan air volume control data V is provided.
  • the water heater Since the combustible air volume region Xr of the control data R and the combustible air volume region Xt of the fan airflow control data T at the time of negative pressure are set in the overlapping region Xv, the water heater is Regardless of whether the installed room is in the standard mode or the negative pressure mode, the ignition of the combustion fan 26 at the time of ignition is controlled in accordance with the fan air volume control data V at the time of the ignition described above, so that the ignition is almost assured. Us It is possible to.
  • control data transfer control section 240 since the control data transfer control section 240 is provided, the negative pressure detection means 2441 is provided after the rotation of the combustion fan 26 at the time of ignition is performed by the ignition airflow rate control section 2338.
  • the control data transfer control unit 240 transfers the fan air volume control data V at the time of ignition to the fan air volume control data T at the time of negative pressure, and the combustion fan 26
  • the rotation of the combustion fan 26 is controlled by transferring to the normal fan air volume control data R, so that better combustion can be achieved according to the combustion environment.
  • the rotation of the combustion fan 26 can be controlled by transferring to appropriate fan air volume control data that can be performed, and better combustion can be performed.
  • This embodiment is applied to a water heater which has a system configuration as shown in FIG. 2 described above, and in which a plurality of stages of fan airflow control data having different fan airflows with respect to combustion capacity are given in advance. There is a feature in the operation control configuration. Note that the description of the system configuration in FIG. 2 described above, and in which a plurality of stages of fan airflow control data having different fan airflows with respect to combustion capacity are given in advance. There is a feature in the operation control configuration. Note that the description of the system configuration in FIG.
  • the control device 230 shown in the second embodiment includes a combustion control unit 235, a data storage unit 236, an ignition air volume control unit 238, and control data transfer control. Department 24, a negative pressure detecting means 241, a control data monitoring unit 242, a combustion state monitoring unit 243, and a control data switching control unit 2444.
  • a combustion control unit 235 and the negative pressure detecting means 241 are the same as those of the first embodiment, a duplicate description thereof will be omitted. .
  • the fan air volume control data V, W, and ⁇ at the time of ignition shown by the chain line in FIG. 19 are stored.
  • the combustible fan air volume regions of each of the fan air volume control data R, S, ⁇ , and U are obtained in advance by experiments, calculations, and the like.
  • the fan air volume control data ⁇ at the time of the ignition is set in an area where the combustible fan air volume area of the fan air volume control data R and the combustible fan air volume area of the fan air volume control data S overlap
  • the fan air volume control data V at the time of ignition is set in an area where the combustible fan air volume region of the above fan air volume control data S and the combustible fan air volume region of the fan air volume control data ⁇ overlap each other.
  • the fan air volume control data W is set in an area where the combustible fan air volume region of the fan air volume control data ⁇ and the combustible fan air volume region of the fan air volume control data U overlap. .
  • the fan airflow control data when the fan airflow control data is switched as can be seen from the fan rotation control data S, ⁇ , and U shown in FIG. 19, the fan airflow greatly changes at the minimum combustion capacity. At the maximum combustion capacity, the fan air volume hardly changes. This is different from the general method of burning with a constant air-fuel ratio, and is uniquely found by the present inventors.
  • the burner is originally a burner that can burn with the maximum combustion capacity, and the air volume is controlled so that it does not disappear even if the fuel is reduced.
  • the lower the combustion capacity the more the combustion flame will be extinguished if the air volume control is not performed accurately.
  • the interval between the fan air volume control data S, T, and U increases as the combustion capacity decreases, and the fan air volume control data S, T increases as the combustion capacity increases.
  • U are set to be narrower.
  • the control data switching control section 244 controls switching of the fan rotation control data according to the negative pressure state of the indoor combustion environment detected by the negative pressure detecting means 241.
  • An operation example of the unit 244 will be described based on the flowchart of FIG. FIG. 20 is similar to FIG. 13, so similar steps are given the same reference numbers.
  • step 101 it is determined whether or not the generation of a negative pressure in the room is detected by the negative pressure detecting means 241, and when the negative pressure in the room is detected, the fan air volume control data is increased by one step in step 102.
  • the fan air flow control data shown in Fig. 19 is described as an example, and the number X in the flow chart corresponds to the X value of each fan air flow control data shown in Fig.
  • step 103 it is determined in step 103 whether or not the negative pressure in the room is released, and the release of the negative pressure in the room is detected.
  • the fan air volume control data is switched to the one-stage air volume down side.
  • step 111 it is determined whether or not an ON signal has been applied from the water amount sensor 22. When the ON signal has been applied, the operation from step 101 onward is repeated. On the other hand, when the off signal is output from the water amount sensor 22, it is determined that the hot-water tap is closed and the combustion is stopped to prepare for the next combustion.
  • the control data switching control unit 244 selects and designates the fan air volume control data according to the intensity of the negative pressure in the room.
  • the control data monitoring unit 242 captures the operation information of the combustion control unit 235, and is used by the control data switching control unit 44 while detecting that the water heater is performing combustion operation based on the information.
  • the information of the fan air volume control data is fetched from time to time and stored in an internal memory (not shown) corresponding to time.
  • the ignition-time air volume control unit 238 captures the operation information of the combustion control unit 235, and when it detects that an ignition command is issued based on the information, from the internal memory of the control data monitoring unit 422. Reads the information of the fan air volume control data that was used when the previous combustion was stopped. Then, the fan air volume control data If the evening is the fan air volume control data U, the ignition air volume control unit 238 reads out the fan air volume control data W on the lower side of the fan air volume control data U from the data storage unit 236. The rotation control of the combustion fan 2 at the time of ignition is performed based on the fan air volume control data W at the time of ignition.
  • the ignition air volume control unit 238 sets the fan air volume control data Y on the upper side of the fan air volume control data R. Is read from the data storage unit 236, and the rotation of the combustion fan 26 at the time of ignition is controlled based on the fan air volume control data Y at the time of ignition.
  • the ignition air volume control section 238 sets the upper and lower of the fan air volume control data S and T.
  • One side fan air volume control data is read from the data storage section 236, and the rotation of the combustion fan 2 at the time of ignition is controlled based on the read fan air volume control data at the time of ignition.
  • the ignition air volume control unit 238 detects that the point ignition has not been achieved based on the frame rod current detected and output from the frame rod electrode 24, the air volume control unit 238 controls the fan air volume on the other side during ignition. De—Control the rotation of the combustion fan 26 based on the evening.
  • the combustion state monitoring section 243 captures the operation information of the combustion control section 235, and monitors the combustion state while detecting that the combustion operation is being performed based on the information. Various means can be considered for monitoring the combustion state.
  • the combustion control section 235 For example, information on the combustion capacity is taken in from the combustion control section 235, and the frame rod current value is detected from the frame port electrode 16 so as to correspond to the combustion capacity when the frame rod current value is detected.
  • the detected frame rod current value is compared with the standard value data as shown in Fig. 21 corresponding to the combustion capacity of the current value.
  • the combustion state monitoring section 243 detects that the combustion state is deteriorating due to insufficient air when the flame rod current value rises beyond a predetermined allowable range above the standard value.
  • the flame rod current value falls below a predetermined allowable range lower than the standard value, it is detected that the combustion state has deteriorated due to excess air.
  • the combustion state is controlled by means other than the above. It may be monitored.
  • the control data transfer control unit 240 incorporates the monitoring information of the combustion state monitoring unit 243 and detects the achievement of spot ignition in the same manner as in the first embodiment. When it is detected that the combustion state is excessive in air based on the information of the state monitoring unit 243, it is transferred to the fan airflow control data lower than the fan airflow control data at the time of ignition used at the time of ignition. Then, the rotation control of the combustion fan 26 is performed. In other cases, the control is shifted to the fan air flow control data above the fan air flow control data at the time of ignition, and the rotation control of the combustion fan 26 is performed.
  • the control data transfer control section 240 detects that the combustion state is insufficient of air based on the information of the combustion state monitoring section 243, the fan air volume control data at the time of ignition used at the time of ignition is used. The control is transferred to the fan airflow control data above the evening to control the rotation of the combustion fan 26, and at other times, the fan airflow control data is transferred to the fan airflow control data lower than the fan airflow control data at the time of ignition. Perform 6 rotations.
  • control data switching control unit 244 achieves the point ignition based on the operation information of the control data transfer control unit 240, and the control data transfer control unit 240 transfers the fan air volume control data.
  • the control data switching operation is performed after a predetermined period has elapsed after detecting that the control data has been detected.
  • fan air volume control data of a plurality of stages is given, and fan air volume control data at the time of ignition set in a region where the combustible fan air volume regions of each fan air volume control data overlap.
  • the ignition operation is performed based on the fan air volume control data at the time of ignition, which is above or below the fan air volume control data used at the time of the previous combustion stop.
  • the fan air volume control data at the time of ignition used for ignition is The combustible fan air volume range of the fan air volume control data used at the time and the fan air volume above or below the previous fan air volume control data Since the combustible fan air volume region included in the control data is set in an overlapping region, spot ignition can be almost surely achieved.
  • the present invention is not limited to the above embodiments, but may be applied to various embodiments. It can take the form.
  • the fan air flow control data at the time of ignition is fan air flow control data dedicated to ignition used only at the time of ignition. May be used for rotation control.
  • the control data transfer control unit 240 controls the fan air volume control data at the time of ignition.
  • the rotation of combustion fan 26 was controlled by shifting to the upper or lower fan air volume control data from one night, but the rotation of combustion fan 26 during ignition by ignition air volume control unit 238
  • the rotation control of the combustion fan 26 based on the fan air volume control data at the time of ignition may be continuously performed after the operation is performed. In this case, immediately after the ignition, the process is shifted to the rotation control of the combustion fan 26 by the control data switching control unit 244 without shifting from the fan air volume control data at the time of ignition to the upper or lower fan air volume control data. Therefore, the control data transfer control unit 240 can be omitted.
  • each fan air volume control data is stored in the data storage unit 236 by graph data.
  • each fan air volume control data is stored in a graph such as table data or arithmetic expression data.
  • the data may be stored in the data storage unit 236 in a data format other than the data.
  • control data transfer control unit 240 is configured to transfer the fan air volume control data at the time of ignition based on the monitoring information of the combustion state monitoring unit 243 to the other fan.
  • the air flow control data was determined and the fan air flow control data was transferred.However, the other fan air flow control data to be transferred from the fan air flow control data at the time of ignition is changed for each fan air flow control data at the time of ignition.
  • the control data transfer control section 240 controls the rotation of the combustion fan 26 by transferring the fan air flow control data at the time of ignition to the predetermined fan air flow control data after ignition. You may do it.
  • the combustion state monitoring unit 243 can be omitted.
  • it is possible to simplify the control configuration. Although it was composed of a bunner such as Eve's semi-bunsen, etc. Since the combustion mode is similar to that of the above, the flame rod current can be changed within a relatively wide range between the upper limit and the lower limit according to the degree of the negative pressure of the indoor combustion environment in the light and shade panner as well as the semi-bunsen panner.
  • the combustion improvement operation shown in the above-described embodiment can be applied to a combustion device provided with a light / dark panner.
  • the water heater having the system configuration shown in FIG. 2 has been described as an example.
  • the combustion is performed using the air supplied by the rotational drive of the combustion fan 26, and the combustion capacity is variably controlled.
  • the present invention can be applied to any combustion device in which the rotation control of the combustion fan is performed based on the combustion capacity and the fan air volume control data given in advance. It can also be applied to combustion equipment other than hot water heaters.
  • the fan air flow control data at the time of ignition is given.
  • An ignition air volume control unit for controlling the rotation of the combustion fan in accordance with the above-described ignition air volume control is provided. Then, the fan air volume control data at the time of ignition described above exceeds the combustible combustion fan air volume region of the normal fan air volume control data and the combustible combustion fan air volume region of the fan air volume control data at negative pressure. The area to be wrapped is set.
  • the rotation of the combustion fan is controlled in accordance with the above-described fan air volume control data at the time of ignition, so that the temperature can be reliably increased. Ignition can be achieved.
  • the negative pressure detecting means is provided, and the control data transfer control unit is provided.
  • the control data transfer control unit sets The fan air flow control data is transferred from the fan air flow control data at the time of negative pressure to the fan air flow control data at the time of negative pressure, and the rotation of the combustion fan is controlled. Transfer in the evening Then, the rotation of the combustion fan is controlled. Therefore, after the point ignition is achieved, the rotation of the combustion fan can be controlled by transferring to appropriate fan air volume control data capable of performing better combustion according to the combustion environment.
  • the negative pressure detecting the indoor negative pressure based on the CO concentration in the exhaust gas and the indoor negative pressure detection based on the frame opening current are used together. Detection means is provided. It is necessary to detect the deterioration of the combustion state due to the negative pressure in the room as soon as possible. Within the range of the combustion capacity (low combustion capacity range) that can detect the deterioration of the combustion with high sensitivity, the negative pressure in the room is detected based on the flame rod current. In addition, since the deterioration of combustion can be detected by the CO sensor in the entire range of the combustion capacity, the indoor negative pressure can be detected based on the concentration of C ⁇ in the exhaust gas, so the negative pressure based on the flame rod current can be detected. By combining the detection with the negative pressure detection based on the CO concentration detection by the CO sensor, it is possible to accurately detect the negative pressure condition of the indoor combustion environment in the entire range of the combustion capacity.
  • multi-stage fan air volume control data in which the air volume of the combustion fan with respect to the combustion capacity is different from each other is given, and the air volume range of the combustible combustion fan provided by each fan air volume control data is A plurality of fan air volume control data at the time of ignition set in the overlapping area are provided, and the ignition arranged above or (and) below the fan air volume control data used when the previous combustion state was stopped.
  • An ignition air volume control unit for performing an ignition operation based on the fan air volume control data at the time is provided.
  • the fan air volume control data at the time of ignition will be The flammable air volume area of the fan air volume control data used when the combustion was stopped and the flammable air volume area of the fan air volume control data above or below the fan air volume area at the time of the previous combustion stop. Is set in the overlapping region, so that spot ignition can be achieved almost certainly.
  • a phenomenon in which the negative pressure state in the room is alleviated occurs after the control of the combustion capacity reduction is performed.
  • the air volume control of the fan used for controlling the combustion capacity reduction is set on the assumption that the negative pressure condition has been alleviated. Therefore, the fan speed is set low in the airflow control data after the combustion capacity has been reduced.
  • a predetermined delay time is required until the negative pressure state in the room is alleviated. Therefore, in the period of the predetermined delay time,
  • fan rotation control data that temporarily increases the rotation speed (blowing capacity) of the fan is used during the transient period.
  • the characteristic control configuration of the embodiment of the third invention has a configuration in which when a negative pressure is generated in the room, it is possible to avoid deterioration of the combustion state due to the generation of the negative pressure, and the room is in a negative pressure state.
  • a configuration is provided to avoid deterioration of the combustion state due to lack of air due to the negative pressure state.
  • FIG. 22 shows a characteristic control configuration in this embodiment.
  • the water heater control device 330 has a combustion control section 33 35, a data storage section 33 36, a fan rotation control data switching control section 33 37, and a reduced capacity. It is configured to include a fan rotation control unit for change 338 and a fan rotation control unit for high CO generation 340.
  • a sequence program for controlling appliance operation is given to the combustion control section 335 in advance, and the combustion control section 335 captures information of the remote controller 31 and sensor output information of various sensors. Then, the appliance is operated based on the acquired information and the sequence program as described above.
  • the data storage section 336 is constituted by a storage device, and the data storage section 336 stores fan rotation control data.
  • the fan rotation control data is data in which the rotation speed of the combustion fan 26 is given in accordance with the combustion capacity (in this embodiment, the combustion capacity from the predetermined minimum combustion capacity to the maximum combustion capacity).
  • the combustion capacity in this embodiment, the combustion capacity from the predetermined minimum combustion capacity to the maximum combustion capacity.
  • a plurality of stages of fan rotation control data R, S, T, and U in which the number of rotations of the combustion fan 26 differs with respect to the combustion capacity are stored in a data storage unit 3 3. 6
  • the predetermined minimum combustion capacity is set to 0%, and as the combustion capacity increases, the% value increases and the maximum combustion capacity becomes 100%.
  • the combustion capacity is replaced by a% value so that
  • the fan rotation control data when the fan rotation control data is switched as can be seen from the fan rotation control data S, T, and U shown in FIG. 23, the fan rotation speed greatly changes at the minimum combustion capacity. On the other hand, at the maximum combustion capacity, the fan speed is hardly changed. This is different from the general method of burning with a constant air-fuel ratio, and is uniquely found by the present inventors.
  • the burner is originally a burner that can burn with the maximum combustion capacity, and the air volume is controlled so that it does not disappear even if the fuel is reduced.
  • the lower the combustion capacity the more the combustion flame will be extinguished if the air volume control is not performed accurately.
  • the above-mentioned fan rotation control data are parallel, but in this embodiment, the intervals between the above-mentioned fan rotation data S, T, U become smaller as the combustion capacity becomes lower.
  • the intervals between the fan rotation control data S, T, and U are set to be narrower as the spread and the combustion capacity increase.
  • the fan rotation control of X20 corresponding to the fan rotation control data R of FIG.
  • the fan rotation control data switching control section 3337 receives the signals from the CO sensor 28 and the frame rod electrode 16 and outputs the fan rotation control data used by the combustion control section 3335 to the CO sensor 28.
  • the fan rotation control data is switched according to the CO concentration detected by the air conditioner or the negative pressure condition of the indoor combustion environment detected by the current of the flame rod electrode 16.One or more of the following functions It has.
  • the switching control of the fan rotation control data is based on the first function of detecting the negative voltage state based on the CO concentration and switching the rotation control data, and the negative control because the frame pad current exceeds the threshold. Detects pressure state and switches rotation control data Effectively by combining the second function to change the rotation control data by detecting the negative pressure state and the negative pressure release by the short-time change of the frame rod current.
  • the air pressure in the room where the water heater is burned and the combustion fan 26 rotates and the ventilation fan 2 also rotates in the closed room is due to the high airtightness of the room.
  • the air pressure P L0 shown in FIG. 24 is lower than the atmospheric pressure outside the room, and the room is in a negative pressure state.
  • the combustion capacity of the water heater decreases due to a variable decrease in the hot water supply set temperature while the room is in the negative pressure state
  • the rotation speed of the combustion fan 26 is increased in accordance with the change in the combustion capacity. Since the amount of air discharged from the room to the outside is reduced by the reduction control, the air pressure in the room increases, for example, as shown by the curve P in Fig. 24, the air pressure in the room increases from P L0 to P hi. As a result, the negative pressure in the room will be reduced.
  • Negative pressure delay is the time required to reach the rotation speed of the combustion fan 26 after the change in performance from the rotation speed of the combustion fan 26 before the change in performance is reduced, for example, while it takes less than about 1 second.
  • the time At required for the indoor air pressure to increase from P L0 to P hi due to a decrease in the number of revolutions of the combustion fan 26 is, for example, about 10 seconds.
  • the fluctuation in the air pressure in the room due to the change in the capacity drop does not follow the fluctuation in the rotation speed of the combustion fan 26.
  • the flow of air in the direction from the outdoor to the room through the exhaust passage 5 is reduced by the decrease in the indoor air pressure relative to the outdoor air pressure (the magnitude of the negative pressure state).
  • the negative pressure state in the room is almost the same as before the capacity change due to the negative pressure delay, even though the rotation speed of the combustion fan 26 after the capacity decrease has decreased due to the capacity decrease.
  • the amount of backflow air entering from the exhaust passage 30 is substantially the same as before the capacity reduction.
  • the rotational speed of the combustion fan 26 after the change in the capacity decrease is assumed to be a favorable value, assuming the airflow of the backflow in a state where the negative pressure in the room is reduced due to the change in the capacity decrease. Since the rotation speed is to supply the air flow for performing the combustion, the air flow of the combustion fan 26 is larger than the air flow for performing the good combustion due to the backflow having the magnitude due to the negative pressure delay. Decrease. For this reason, the amount of air supplied to the burner 8 becomes much smaller than the amount of air for performing good combustion, and the combustion state deteriorates due to insufficient air, or the combustion flame starts due to excessive insufficient air. The problem of disappearing occurs ⁇
  • a method is proposed that can prevent the combustion capacity from being deteriorated due to a shortage of air and the burning flame from going out when the decrease in the combustion capacity is changed.
  • the fan rotation control section 338 captures the information of the combustion capacity from the combustion control section 335 from time to time, and stores the captured combustion capacity in time into the built-in memory (not shown). In addition to storing the information, the change in combustion capacity is monitored as follows based on the information on the captured combustion capacity.
  • the fan rotation control unit 338 at the time of the change in the capacity fetches the current combustion capacity from the combustion control unit 335, and fetches it before a predetermined set time (for example, 2.6 seconds before) and the built-in memory.
  • the combustion capacity before the set time stored in the storage capacity is read, and the current combustion capacity is compared with the combustion capacity before the set time to determine the change amount of the current combustion capacity with respect to the combustion capacity before the set time.
  • the fan rotation control unit 338 compares the obtained variation in the combustion performance with a predetermined performance reduction variation ⁇ (for example, 10%).
  • ⁇ E is a change in combustion capacity decrease for determining whether or not there is a risk that the combustion state may deteriorate due to the negative pressure delay when a change in combustion capacity decrease is performed. It has been obtained through experiments and calculations.
  • the fan rotation control unit 3 38 at the time of the capacity reduction change determines that the combustion capacity has been reduced by the above-mentioned capacity reduction change ⁇ ⁇ or more based on the above-mentioned change amount of the combustion capacity. If the rotational speed of the combustion fan 26 is reduced according to the data, if the room is in a negative pressure state, the negative pressure lag causes the combustion state to deteriorate due to insufficient air, or the combustion flame to decrease due to excessive insufficient air. Judging that there is a possibility that a problem such as disappearing may occur, the fan rotation control data is transferred to the fan Is switched to the fan rotation control data higher than the rotation control data, and outputs a control data up signal to the combustion control unit 335 to perform the rotation control of the combustion fan 26.
  • the fan rotation control data of the upper fan rotation control data (for example, the fan rotation before the performance reduction change is determined) is set in advance. Switch to fan rotation control data, one step higher than the control data, and control the rotation of combustion fan 26. Specifically, for example, when the rotation control of the combustion fan 26 is being performed according to the fan rotation control data S shown in FIG. 23, for example, the direction in which the hot water user decreases the hot water supply set temperature In accordance with the change in the set hot water supply temperature, the combustion capacity is changed from the combustion capacity a to the combustion capacity ⁇ so as to be reduced by the above-mentioned capacity reduction change amount ⁇ ⁇ or more.
  • the combustion controller 335 receives the control data up signal and switches the fan rotation control data S to the fan rotation control data 1 in the upper stage by one step to change the combustion fan 2. Perform rotation control of 6.
  • the combustion fan 2 is increased from the rotation speed at the point ⁇ of the fan rotation control data S shown in FIG. 23 to the rotation speed at the point B of the fan rotation control data T.
  • the rotation speed of the combustion fan 26 corresponding to the combustion capacity / S after the capacity change is reduced from the point B to the point C which is the rotation number of the combustion fan 26 according to the fan rotation control data T.
  • the fan rotation control unit 338 at the time of the change in performance reduction has a built-in timer (not shown). After outputting the control data up signal, the combustion fan is controlled based on the operation information of the combustion control unit 335. 26 When it is detected that the rotation speed of 6 has reached the rotation speed after the capacity change, the built-in timer is driven, and the measured time of the timer is compared with a predetermined standby time (for example, 10 seconds). It is determined whether or not the time measured by the timer has reached the above-mentioned standby time.
  • a predetermined standby time for example, 10 seconds
  • the standby time is a time obtained by adding a margin time to the time ⁇ t from when the rotational speed of the combustion fan 26 is reduced to be substantially reduced until the negative pressure delay is substantially eliminated, and is obtained in advance by experiments, calculations, and the like and stored. Stored in part 3 3 6. Then, when it is determined that the measurement time of the timer has reached the standby time, the negative rotation delay has been resolved, and the fan rotation control unit 338 at the time of the change in capacity reduction switches to the lower fan rotation control data because the negative pressure delay has been resolved. It is determined that the problem of deterioration of the combustion state caused by the negative pressure delay can be avoided even if the rotation control of the combustion fan 26 is performed, and a control data down signal is output to the combustion control unit 335.
  • the combustion control unit 335 When the combustion control unit 335 receives the control data overnight down signal from the above-mentioned capacity reduction change fan rotation control unit 338, the combustion control unit 335 performs predetermined lower fan control data (for example, the fan rotation before the performance reduction change). Switch to control data S) and control the rotation of combustion fan 26.
  • predetermined lower fan control data for example, the fan rotation before the performance reduction change.
  • the combustion fan 26 is reduced from the rotation speed at the point C of the fan rotation control data T to the rotation speed at the point D of the fan rotation control data S.
  • the fan rotation control data is calculated based on the fan rotation control data before the performance reduction change. Also switches to the upper fan rotation control mode to reduce the number of revolutions of combustion fan 2 to the number of revolutions after the change in capacity, so the number of revolutions of combustion fan 26 is reduced according to the fan rotation control data before the capacity change. Therefore, the number of revolutions of the combustion fan 2 is larger than that of the burner, and the amount of air supplied to the burner 1 can be suppressed from being significantly reduced from the amount of air required for performing good combustion by increasing the fan airflow. It is possible to prevent the combustion state from deteriorating due to a shortage of air due to a negative pressure delay at the time of the decrease.
  • the rotation speed based on the above-mentioned fan rotation control data is continuously maintained until the set standby time elapses after the rotation speed has been reduced to the rotation speed after the capacity reduction change, that is, until the negative pressure delay is eliminated. Therefore, the effect of preventing the deterioration of the combustion state due to the lack of air due to the negative pressure delay can be continued until the negative pressure delay is eliminated.
  • the air volume of the combustion fan 26 becomes smaller as the decrease in the combustion capacity increases even if the rotation speed of the combustion fan 26 is the same. It becomes. From this, although the rotation of the combustion fan 26 is controlled by switching to the upper stage fan rotation control unit by the fan rotation control unit 338 at the time of the performance reduction change, the amount of change in the reduction of the combustion capacity is large. Therefore, the air volume of the combustion fan 26 becomes smaller than the air volume for good combustion, and the amount of air supplied to the Pana 18 becomes smaller than the air volume for good combustion. Combustion may deteriorate.
  • the fan rotation control unit 340 at the time of high CO generation is provided, and the combustion performance is reduced by the capacity reduction change amount ⁇ ⁇ or more, and the fan rotation control data before the performance reduction is changed.
  • the control of the combustion fan 26 is being performed by switching to control data overnight, and when the high-CO generation fan rotation control unit 340 detects a combustion state of insufficient air, the fan rotation control data is output. Is further switched to the upper fan rotation control data to control the rotation of the combustion fan 26.
  • the present inventors have focused on the fact that when the combustion state deteriorates due to insufficient air, the C ⁇ concentration in the exhaust gas increases, and detect the deterioration of the combustion state due to the insufficient air by detecting the increase in the C0 concentration in the exhaust gas. I made it.
  • the fan rotation control section 340 detects the sensor output of the CO sensor 28 as the CO concentration in the exhaust gas, and outputs it from the combustion control section 335 or the fan rotation control section 338 when the capacity is changed. Based on the acquired operation information, the performance is reduced due to the capacity reduction change. While it is detected that the rotation control of the combustion fan 2 is being performed by switching to the fan rotation control data higher than the fan rotation control data before the change, When it is determined that the CO concentration in the exhaust gas detected and output by the C0 sensor 28 is equal to or higher than a predetermined dangerous value (for example, 2000 ppm), the control data up signal when high CO is generated Is output to the combustion controller 3 35.
  • a predetermined dangerous value for example, 2000 ppm
  • the above-mentioned danger value is the CO concentration in the exhaust gas for judging whether or not the combustion state has deteriorated due to the shortage of air, and is obtained in advance by experiments or calculations and stored in the data storage unit 336.
  • the combustion control unit 335 When the combustion control unit 335 receives the high C ⁇ ⁇ ⁇ generation control data up signal from the high CO generation fan rotation control unit 340, the combustion rotation control unit 338 before the capacity change Fan rotation control data above the fan rotation control data Even though the combustion fan 26 was controlled in the evening and the rotation was controlled, the combustion condition deteriorated due to insufficient air.In order to improve the deterioration of the combustion condition due to insufficient air, the data was switched to the upper fan rotation control data. Control of the combustion fan 26 to determine that it is necessary to increase the amount of air supplied to the burner 1 by increasing the fan airflow, and switch the fan rotation control data to the upper fan rotation control data. To control the rotation of the combustion fan 26.
  • the fan rotation control data S is switched to the fan rotation control data T, and the rotation speed of the combustion fan 26 is reduced according to the fan rotation control data T (for example, FIG. 23).
  • the fan rotation controller 340 outputs when the high C0 occurs.
  • the combustion control unit 3 35 receives the high-CO generation control data up signal and switches to the upper fan rotation control data U, that is, the rotation speed of the combustion fan 26 is increased to the rotation speed at point F. After that, according to the fan rotation control data U, the rotation speed of the combustion fan 26 is reduced to a point G, which is the rotation speed after the change in the performance reduction.
  • the high-CO generation fan rotation control unit 340 has a built-in timer.Based on the operation information fetched from the combustion control unit 335, the rotation speed of the combustion fan 26 changes to the rotation speed after the capacity change. When it is detected that the time has been reached, the driving of the above-mentioned timer is started, the measured time of the above-mentioned timer is compared with a predetermined standby time Tco (for example, 10 seconds), and the measured time of the timer is set to the above-mentioned standby time Tco. Outputs the control data down signal when high C0 occurs when it is determined that co has been reached.
  • Tco standby time
  • the standby time Tco is a time obtained by adding a marginal time to a time required for substantially eliminating the negative pressure delay, and is obtained in advance by experiments, calculations, and the like, and stored in the data storage unit 336.
  • the combustion control unit 335 When the combustion control unit 335 receives the high CO generation control data down signal from the high CO generation fan rotation control unit 40, the negative pressure delay has been eliminated. Judging that switching to the rotation control data is allowed, the fan rotation control data is converted to the lower fan rotation control data (for example, the fan rotation control data T one step below the fan rotation control data U, Rotation control Switch to data S) and control the rotation of combustion fan 26.
  • the fan rotation control data for example, the fan rotation control data T one step below the fan rotation control data U, Rotation control Switch to data S
  • the control data down from the capacity reduction change fan rotation control section 338 is performed.
  • a cancel signal that cancels the output of the signal is output to the fan rotation control unit 338 when the performance is changed, and the control data down signal is output from the fan rotation control unit 38 when the performance is changed. Cancel.
  • the fan rotation control data before the capacity change is changed. Since the rotation of the combustion fan 26 is controlled by switching to the fan rotation control data at the upper stage than the evening, the combustion fan 26 is controlled more than the rotation control of the combustion fan 26 according to the fan rotation control data before the capacity change. 6, the amount of air supplied to the burner 1 can be prevented from dropping much less than the amount of air required for good combustion. However, the problem of extinguishing of the combustion flame due to excessive air shortage can be avoided.
  • the fan rotation control unit 338 is switched to the upper stage fan rotation control unit by the fan rotation control unit at the time of the performance reduction change, so that the combustion fan is changed. If the amount of air supplied to the burner 1 becomes smaller than the amount of air that performs good combustion inclining and the combustion state deteriorates due to lack of air after performing the rotation control in 26, The deterioration of the combustion state due to the shortage of air is detected by the increase in the C ⁇ concentration in the exhaust gas, and the high-CO generation fan rotation control unit 340 can switch to the upper fan rotation control data.
  • the capacity reduction change-time fan rotation control unit 338 fetches the information of the combustion capacity from the combustion control unit 335, but, for example, a proportional control variably controlled according to the combustion capacity.
  • Valve opening of valve 13 (that is, proportional valve drive current ) May be detected as the combustion capacity.
  • the fan rotation control unit 338 when the combustion capacity is reduced by the predetermined capacity reduction change amount ⁇ E or more, regardless of the negative pressure state, the fan rotation control unit 338 at the time of the capacity reduction change, Although the fan rotation control data was switched to the upper stage than the fan rotation control data before the performance reduction, the negative pressure delay occurred when the performance reduction was changed because the room was under negative pressure.
  • the above-mentioned capacity reduction change-time fan rotation control unit 338 is used when the combustion capacity is reduced by the set capacity reduction change ⁇ E or more when the room is in the negative pressure state. Only the upper stage fan rotation control may be switched to the upper stage.
  • the combustion fan 2 is controlled according to the upper fan rotation control data. Since the time for performing the rotation control is very short, about 10 seconds, deterioration of the combustion state due to excessive air as described above cannot be substantially avoided.
  • the performance reduction change fan rotation control unit 338 switches to the fan rotation control data higher than the fan rotation control data before the performance change
  • the magnitude of the performance reduction change amount was switched to the fan rotation control data that is one stage higher than the fan rotation control data before the capacity change.
  • the capacity reduction change was 10% or more and 35% If it is less than the range, it is switched to the fan rotation control data one step higher than the fan rotation control data before the capacity change, and the capacity reduction change is within 35% or more and less than 50%
  • the degree of deterioration of the combustion state due to lack of air is likely to increase due to the large amount of change in performance, so in order to avoid the deterioration of the combustion state due to lack of air, the rotational speed of the combustion fan 26 must be reduced.
  • the fan rotation control unit 3 38 at the time of the change in the capacity decrease is set to the upper stage, so that the fan rotation control unit is switched to the fan rotation control data that is two steps higher than the fan rotation control data before the capacity change.
  • fan rotation control data according to the magnitude of the capacity reduction change amount may be selected, and switching may be performed to the selected fan rotation control data.
  • the fan rotation control data according to the magnitude of the capacity reduction change amount is selected.
  • the fan rotation control unit 338 at the time of the performance reduction change can switch to the fan rotation control data that matches the degree of the combustion deterioration state due to the negative pressure delay. From this, the combustion state does not worsen due to the shortage of air even when switching to the upper fan rotation control system at the time of the capacity reduction change, so in such a case, the fan rotation during high CO O
  • the control section 340 may be omitted.
  • the fan rotation control unit 338 at the time of the change in the capacity and the fan rotation control unit 340 at the time of the occurrence of the high C0 decrease to the rotation number after the capacity change according to the switched fan rotation control data.
  • the detection may be performed based on the rotation speed of the combustion fan 26 detected by the following.
  • the fan rotation control data is given by graph data, but may be given in a data format other than graph data such as table data or arithmetic expression data.
  • the standby time that determines the timing for switching to the lower fan rotation control data is constant, but the time required for the negative pressure delay to be eliminated as the capacity reduction change amount increases. As the capacity change amount increases, the standby time may be increased continuously or stepwise.
  • the rotation speed of the combustion fan 26 is controlled based on the fan rotation control data in which the rotation speed of the combustion fan 26 is given in accordance with the combustion capacity.
  • the airflow of the combustion fan 26 is controlled by using the fan airflow control data given in accordance with the combustion capacity, as shown in Fig. 23. It may be performed.
  • a current rise fan rotation control unit 342 shown by a dotted line in FIG. 22 may be provided instead of the high-CO generation fan rotation control unit 340 shown in the above embodiment. Focusing on the fact that the deterioration of combustion can be detected based on the flame rod current as described above, the fan rotation control unit 348 at the time of current rise is used to control the fine rotation control Switch to combustion fan 2 6 times When combustion deterioration is detected based on the flame rod current while the rotation control is being performed, it is switched to the fan rotation control data in the upper stage to avoid the deterioration of the combustion state caused by the negative pressure delay. It is.
  • an example of the control operation of the above-described current rise fan rotation control unit 342 will be described.
  • the current increase fan rotation control section 3 4 2 detects the frame rod current detected and output from the frame rod electrode 16 and takes it in from the combustion control section 3 3 5 and the fan rotation control section 3 3 8 when the capacity is changed. Based on the operation information, while detecting that the rotation control of the combustion fan 2 is being performed by switching to the fan rotation control data in the upper stage from the fan rotation control data before the performance reduction due to the performance reduction due to the performance reduction change When it is determined that the frame port current has risen above the upper threshold shown in FIG. 10, a current rise control data up signal is output to the combustion control unit 3335.
  • the combustion control unit 335 When the combustion control unit 335 receives the control data up signal when the current rises from the above-mentioned fan rotation control unit 342 when the current rises, the combustion control unit 335 switches to the fan rotation control data on the higher fan speed to switch the combustion fan 2 The rotation control of is performed.
  • the fan rotation control section 342 when the current rises has a built-in timer (not shown), and the number of rotations of the combustion fan 26 changes according to the operation information taken from the combustion control section 335.
  • the timer is driven, and the timer time of the timer is compared with a predetermined standby time T st (for example, 10 seconds), and the timer time of the timer is calculated. Outputs the control data down signal at the time of current rise when it is determined that the standby time has reached the standby time T st.
  • the combustion control unit 3335 When the combustion control unit 3335 receives the current rise control data down signal from the above-described current rise fan rotation control unit 3422, the combustion control unit 335 switches the fan rotation control data to the fan rotation control data on the low rotation speed side and performs combustion. Control the rotation of fan 26.
  • a fan rotation control section 344 for combined use of a frame rod current value and a CO concentration shown by a chain line in FIG. 22 is provided. You may.
  • the frame rod current value / CO concentration combined fan rotation control unit 344 4 captures, for example, the frame rod current detected and output from the frame rod electrode 16 and the combustion capacity information from the combustion control unit 335.
  • the sensor output detected by the CO sensor 28 is detected as the concentration of C ⁇ in the exhaust gas, and the operation information taken from the combustion control unit 335 and the fan rotation control unit 338 when the performance is changed is reduced.
  • the combustion capacity When it is determined that the flame load current is lower than the preset combustion capacity (for example, combustion capacity of 30%) and the flame rod current has risen to the upper threshold value shown in FIG. If it is determined that the C ⁇ concentration in the gas has increased to a predetermined dangerous value (for example, 2000 ppm) or more, the control data up signal for the current rise and high C ⁇ generation is sent to the combustion control unit.
  • the preset combustion capacity for example, combustion capacity of 30%
  • Combustion control unit 335 increases the current from flame rod current value and CO concentration combined fan rotation control unit 344. Switch to the fan rotation control data on the side to control the rotation of combustion fan 2.
  • the flame rotation current value / C ⁇ concentration combined fan rotation control section 344 has a built-in head (not shown), and the combustion fan 26 based on the operation information taken from the combustion control section 35.
  • the timer is driven, the measured time of the timer is compared with a predetermined standby time T st (for example, 10 seconds), and the When it is determined that the measuring time has reached the above standby time T st, a current rise and a high C control data down signal is output.
  • the combustion control unit 335 When the combustion control unit 335 receives the flame load current value, the current rise from the CO concentration combined fan rotation control unit 344, and the high (0: 0 control data down signal, the fan rotation control data Evening is switched to the fan rotation control date on the Control the rotation of pin 26.
  • the flame rod current has a current range in which the deterioration of combustion can be detected with high sensitivity, and in the region outside this current range, the combustion deterioration can be detected with high sensitivity by the CO concentration.
  • the state deterioration detection and the combustion state deterioration detection based on the CO concentration in the exhaust gas the deterioration of the combustion state can be detected with high sensitivity over the entire range of the combustion capacity.
  • the fan rotation control unit 338 switches to the upper stage fan rotation control data by the fan rotation control unit at the time of performance change and the rotation control of the combustion fan 2 If the combustion condition deteriorates due to the lack of air while the engine is running, the deterioration of the combustion condition can be detected based on the flame rod current, and further switched to the upper fan rotation control data. Therefore, it is possible to reliably prevent the combustion state from deteriorating due to the lack of air due to the negative pressure delay.
  • the fan rotation control unit at the time of the change in the capacity reduction is provided, and a plurality of stages of fan rotation control data having different rotation speeds with respect to the combustion capacity are provided. Since a plurality of stages of fan airflow control data having different fan airflows are provided, when the combustion capacity is reduced by a predetermined capacity reduction change amount or more, the above-described capacity reduction change fan rotation control unit The fan rotation control data or the fan air volume control data can be switched to the control data in the upper stage than the control data before the performance reduction change.
  • the fan rotation control unit for high C0 generation, the fan rotation control unit for current rise, and the fan rotation control unit for flame load and CO concentration are provided, the fan rotation when the above-mentioned capacity reduction is changed
  • the control unit switches to the upper combustion capacity and If the deterioration of the combustion state is detected based on the CO concentration in the exhaust gas and the flame rod current value detected and output by the CO sensor during engine rotation control, The fan rotation control unit and the fan rotation control unit at the time of current rise ⁇ frame rod current value ⁇ ⁇ ⁇ ⁇
  • the fan rotation control unit with CO concentration switches to the upper fan rotation control data or fan air volume control data to switch the combustion fan Since rotation control is performed, when the performance is changed, the rotation of the combustion fan is controlled by switching to the upper control data by the fan rotation control unit when the performance is changed, but the combustion state deteriorates due to insufficient air.
  • the air volume of the combustion fan can be increased, and the amount of air supplied to the combustion can be increased to improve the deterioration of the combustion state.
  • the number of rotations of the fan (blowing capacity) at the time of restarting the combustion is determined. Control the rotation speed (blowing capacity) higher than usual.
  • FIG. 25 shows the main parts of the control device 14.
  • the combustion control section 432 has the same function as the combustion control section 32 described in FIG.
  • the air volume control unit 433 also controls the air volume according to the air volume control data shown in FIG. 5 described in FIG.
  • the air flow control data specifying unit 434 designates the fan air volume control data on the air volume side B as the air volume control data by the combustion restart air volume control data specifying unit 434, the specified air volume Using the fan air volume control data B for up, the fan air volume is controlled according to the proportional valve opening.
  • the sensor energization control unit 436 energizes the CO sensor 428 to maintain a state where the CO sensor 428 can normally detect the CO concentration. Then, when the combustion operation is stopped, post-energization is performed, for example, for 120 minutes thereafter, and when the combustion operation is restarted, the system is ready to detect the CO concentration immediately. Further, the zero point correction of the CO sensor 28 is performed during the boost energization period, and the deviation of the zero point of the CO sensor 28 is corrected.
  • the sensor energization control unit 436 normally supplies the CO sensor 28 with a signal.
  • a current larger than that at the time of the CO concentration detection is applied to increase the CO detection unit of the CO sensor 28 to, for example, 400, and incineration removal of hydrocarbons and other deposits on the surface of the CO detection unit is performed to perform heat cleaning.
  • the sampling unit 437 captures (samples) the C ⁇ concentration detection signal from the CO sensor 28 at predetermined intervals, for example, at 0.1-second intervals using a time measurement unit 435 such as a clock mechanism, and converts the sampling value into an ER calculation unit 438.
  • a time measurement unit 435 such as a clock mechanism
  • the ER calculation unit 438 is provided with the data of the danger arrival time T to reach the danger state of C0 poisoning when it is assumed that a person is exposed to the atmosphere of the C0 concentration for each CO concentration. .
  • data on the time to reach danger for each CO concentration is given, such as Tl for C ⁇ concentration XI, T2 for CO concentration X2, and danger arrival time T3 for CO concentration X3. I have.
  • the ER operation unit 438 obtains the C ⁇ concentration detection value added every 0.1 second from the sampling unit 437 as an average value per unit time t (for example, 1 second), and corresponds to the average CO concentration per unit time.
  • the ratio t / T between the unit time t and the danger arrival time T is calculated as the stop constant ER.
  • the stop constant ER is obtained as tZT2, t / T3.
  • the value of the stop constant ER obtained every time the unit time t elapses is added to the TR calculation unit 439. Since the control circuit of the control device 14 uses a computer circuit, the stop constant ER and the integrated value TR of the ER are actually converted to a value multiplied by 250 to perform data processing. However, in this specification, the explanation will be made using a value that is not multiplied by 250 to make it easier to understand the content of the invention.
  • the TR operation unit 439 accumulates (adds) the value. Then, the integrated value TR of the stop constant ER is added to the CO safety operation section 40.
  • the C ⁇ safe operation section 440 is provided with the value of the dangerous CO concentration in multiple stages, for example, a value of 0.7 is given as the value of the dangerous C ⁇ concentration of the first stage, and 0.8 is the second stage. Is given as the value of the dangerous C ⁇ concentration, 0.9 is given as the value of the dangerous CO concentration in the third stage, and the range of more than 0.9 and less than or equal to 1.0 is given as the value of the dangerous CO concentration in the final stage.
  • the CO safety operation unit 440 has the stop condition added from the TR operation unit 439.
  • the integrated value TR of the number ER is compared with the value of the dangerous C ⁇ concentration in each of the above-mentioned stages, and when the integrated value TR reaches the value of the dangerous CO concentration in each of the stages up to the third stage, re-combustion is started by reset. Operate in the A-stop control mode. When the integrated value TR falls within the range of the final stage danger C ⁇ concentration, perform the operation in the B-stop control mode.
  • the operation in the B stop control mode is a control operation that does not accept the combustion operation command even if a combustion operation command is issued until a predetermined time (for example, 2 hours) has elapsed after the combustion is stopped, that is, a reset operation after the combustion is stopped.
  • the display unit 441 determines from the C0 safe operation unit 40 that the integrated value TR of the stop constant ER has reached the value of the dangerous C ⁇ concentration at each stage, since the combustion operation is a control operation that cannot be performed until the predetermined time has elapsed.
  • the status is displayed on the display of the remote controller 31 when an error occurs.For example, if the integrated value ER of the ER reaches the value of the dangerous C0 concentration in each stage up to the third stage, an error 90 is displayed. When the integrated value TR falls within the range of the dangerous CO concentration at the final stage, an error 13 is displayed.
  • the combustion restart air volume control data designating section 434 is reset by the CO safety operation section 40 when the integrated value TR of the stop constant ER reaches the value of the dangerous C
  • the control data is switched from the control data A in the normal operation shown in Fig. 4 to the fan air volume control data B for increasing the air volume in which the fan air volume is shifted to the increasing side.
  • the control data B on the up side perform spot ignition and restart the combustion operation.
  • the CO safety operation unit 440 information from the CO safety operation unit 440 that the CO safety operation was performed by stopping the combustion at each stage from the CO safety operation unit 440 to the third stage is detected, and a reset signal (for example, operation When the switch is turned off and then the operation switch is turned on), the air flow control data is switched from A to B and specified.
  • a reset signal for example, operation When the switch is turned off and then the operation switch is turned on
  • the air flow control section is operated during the restart operation of the combustion by the reset after the CO safety operation by the CO safety operation section 440 by the CO safety operation section 440.
  • 433 performs air volume control (fan speed control) in accordance with the control of the proportional valve opening by the combustion control unit 432 using the air volume control data B on the air volume up side.
  • reference numeral 30 denotes a memory (E 2 PROM). It stores the operation data of the combustion operation mode (data such as used fan air volume control data).
  • step 4101 it is determined whether or not the post energization flag of the C0 sensor 28 is turned on.
  • the boost energizing flag is on, it is determined that a hot start (combustion starts while post-energizing the CO sensor 28) is performed.
  • the boost energizing flag is off, it is determined that the engine is in a cold start state. If so, the process proceeds to step 4104. If the post-energization flag is off, the process proceeds to step 4102.
  • step 4102. heat cleaning is performed in step 4102.
  • a current for heat cleaning is supplied from the sensor conduction control unit 436 to the C sensor 28, and the CO sensor 28 is supplied.
  • Heat the CO detection section to approximately 400 ° C for heat cleaning.
  • step 4103 it is determined whether or not 40 seconds of the heat cleaning period has elapsed.
  • the operation of step 4104 is performed assuming that the heat cleaning has ended.
  • the operation of this step 4104 is an operation to be performed, for example, for 20 seconds from time tB to tC in FIG.
  • the operation in step 4104 is a transitional period from the completion of the heat cleaning of the CO sensor 28 to the stabilization of the operating temperature at which the C 0 sensor 28 can stably detect the C 0 concentration. Since reliability of the detected value cannot be obtained, as shown in step 105, only the detection of a dangerous C ⁇ ⁇ concentration as high as 3000 ppm is detected.
  • step 4105 for example, it is determined whether or not the detected concentration of the CO sensor 28 is 3000 ppm or less on average for one second, and if it exceeds 3000 ppm, the operation in the combustion improvement mode 1 is performed in step 109.
  • the operation in the combustion improvement mode 1 is an operation in which the airflow control data is switched from A to B (see FIG. 4), and the rotation speed of the combustion fan 26 is controlled to increase the airflow.
  • step 4110 it is determined whether or not 20 seconds have elapsed after the operation of the combustion improvement mode 1.When 20 seconds have elapsed, the average 1-second CO concentration detected again by the CO sensor 28 in step 4111 is 3000 ppm.
  • step 4112 If it exceeds 3000 ppm, it is determined that the combustion improvement effect of the combustion improvement mode 1 cannot be obtained, and in step 4112, control is shifted to B stop control, and error 13 is displayed on the display of the remote control or the like. indicate. On the other hand, if it is determined in step 4111 that the CO concentration is 3000 ppm or less, the operation returns to step 4105 and thereafter.
  • the B stop control in step 4112 is a control operation for immediately stopping the combustion operation and not restarting the combustion operation until two hours have elapsed after the stop, as described above.
  • step 4105 When it is determined in step 4105 that the CO concentration is 3000 ppm or less on average for one second, it is determined in step 4106 whether or not the boost energization flag of the CO sensor is on, and it is determined that the flag is not on.
  • step 4106 determines whether or not the boost energization flag of the CO sensor is on, and it is determined that the flag is not on.
  • the time tC which is 20 seconds after the time tB when the heat cleaning has ended, has reached time tC. At that time, that is, when it is determined that the CO sensor 28 is in a state of stably detecting the CO concentration, the operation moves to Step 4113.
  • step 4106 If it is determined in step 4106 that the boost energization flag is ON, the time required from when combustion in the combustion improvement mode is performed in step 4110 until the CO concentration is sufficiently reduced, that is, Then, it is determined whether or not 50 seconds have elapsed from the time t B shown in FIG. 26. When 50 seconds have elapsed, the operation shifts to the normal CO concentration detection operation from step 4113.
  • step 4114 After the start of the normal detection of the C ⁇ concentration in step 4113, that is, in the operation after time t C shown in FIG. 26, in step 4114, it is determined whether or not the C concentration is 350 ppm or less on average for 10 seconds. . If the CO concentration exceeds 350 ppm, the operation of the combustion improvement mode 1 in step 4116 (the operation of switching the air flow control data from the normal fan control data A to the control data B on the air flow up side to perform the combustion operation) ) I do.
  • step 4114 When it is determined in step 4114 that the CO concentration is 350 ppm or less, it is determined in the next step 115 whether the C concentration is 1500 ppm or less on average for 1 second, and the C concentration is 1500 ppm. If it has exceeded, the operation of the combustion improvement mode 1 is performed in step 4116, and the flow advances to step 117. Also, in step 4115, if the one-second average CO concentration value is 1500 ppnr or less, the operation shifts to step 4117.
  • step 4117 based on the C ⁇ concentration detection information from the CO sensor 28, a stop constant ER corresponding to the detected concentration and an integrated value of the stop constant ER are calculated.
  • step 4122 each of the first to third steps is performed.
  • step 4121 if it is determined in step 4121 that the integrated value of the stop constant ER is smaller than the value of the dangerous CO concentration in each of the first to third stages, the operation of the combustion improvement mode 2 is performed in step 4121. Is performed. In the operation of the combustion improvement mode 2, for example, the upper side of the control range of the proportional valve opening of the combustion control data as shown in FIG. 5 is cut at, for example, 95%, and the proportional valve opening is reduced from 0% to 95%. The combustion operation is performed within the range. Note that the operation of the combustion control mode 2 in step 4121 may be omitted.
  • step 4118 it is determined in step 4118 whether or not the feedwater flow rate is detected by the feedwater flow rate sensor 22.
  • the water supply flow rate sensor 22 outputs an off signal of the water supply flow rate after performing the operations from 41 to 14, it is determined that the hot water tap is closed, and the combustion operation is stopped.
  • step 4124 an error 90 indicating that the A-stop control is being performed is blinkingly displayed on the display unit of the remote controller 31 or the like.
  • step 4125 the solenoid valve 12 (original solenoid valve), the solenoid valve 11 and the proportional valve 13 are closed (turned off), the combustion lamp of the remote control is turned off, and the combustion improvement start flag is turned off. Power supply to the CO sensor 28 is stopped.
  • step 4126 the combustion fan 26 is rotated at the maximum speed for 7 seconds, and the hot water tap is closed. Then, in a step 4128, it is determined whether or not the operation switch is turned off. When the operation switch is ON, the operation proceeds to the next step 4129.
  • step 4129 it is determined whether or not two hours have elapsed since the combustion was stopped. If two hours have elapsed, the integrated value of the stop constant ER is reduced to half in step 130, and the combustion improvement start flag is turned off. Then, in step 4131, it is determined whether four hours have elapsed since the combustion was stopped.If four hours had elapsed, it was determined that all the C ⁇ gas in the room had exited the room, and the integrated value of the stop constant ER was determined. To zero.
  • step 4128 determines whether or not the operation switch has been turned off.
  • step 4133 determines whether or not the operation switch has been turned on.
  • the reset signal is applied to the combustion restart airflow control data designating section 434 shown in Fig. 25, and the operation lamp is turned on in step 4134.
  • step 4135 the fan air volume control data is switched and designated from the normal fan air volume control data A shown in FIG. 4 to the fan air volume control data B for air volume up, and the flow proceeds to the ignition operation in step 4100.
  • step 4100 the combustion fan 26 is rotated, ignited, and performs a combustion operation with the fan-up fan air volume control data B specified in step 4134.
  • the combustion restart air flow control data designating section 434 fetches the information of the fan air flow control data used in the previous combustion operation stored in the memory 430, and the combustion operation is stopped by the operation of the A stop control. For example, when the fan air flow control data of B is used, when the combustion is restarted by resetting, the fan air flow control data of D, for example, on the air flow gap side is specified, and this D air flow control data is designated.
  • the ignition operation is performed using the fan air volume control data.
  • the combustion is stopped when the integrated value of the stop constant ER obtained from the detected CO concentration during the combustion operation reaches a predetermined dangerous CO concentration value, and the combustion operation is restarted after the combustion is stopped.
  • the combustion operation is restarted by selecting and specifying the fan air volume control data for increasing the air volume.Therefore, even if the CO concentration reaches the dangerous concentration due to clogging of the exhaust system, etc., combustion is stopped.
  • combustion resumes wind Since the combustion operation is restarted with the amount increased, the shortage of air supply due to clogging of the exhaust system is eliminated by the air volume gap, and the air volume matching the combustion heat is supplied, so the combustion operation is performed.
  • high-concentration c ⁇ gas is not generated again, and combustion operation is not stopped. Thus, combustion operation after restarting combustion can be continued smoothly.
  • a stop constant is determined for each detected CO concentration, and a safety operation for C ⁇ poisoning is performed based on the integrated value of the stop constant, assuming that exhaust gas has leaked into the room.
  • the switching control of the fan rotation control data includes the first function of detecting the negative pressure state based on the CO concentration and switching the rotation control data, and the frame head current sets the threshold value.
  • the second function that detects the negative pressure state and switches the rotation control data when it exceeds the limit, and switches the rotation control data by detecting the negative pressure state and the negative pressure release due to the short-term change of the flame load current. Effectively done by combining with the third function.
  • the flame rod 16 detects the external flame of the combustion flame shown in FIG. 7 when the combustion state is good, a negative pressure state is generated and is caused by the negative pressure state.
  • both the outer flame and the inner flame extend, and the flame mouth 16 detects the inner flame.
  • the outer flame has a high electrical resistivity and the inner flame has a low electrical resistivity, when the frame rod 16 shifts from the external flame detection state to the internal flame detection state due to the generation of a negative pressure state as described above. However, the electrical resistivity decreases, and the frame rod current detected and output from the frame rod 16 increases.
  • the frame rod current value increases when the room is in a negative pressure state, and thus the room is in a negative pressure state when the frame opening current value increases.
  • the fourth embodiment of the present invention relates to a method for restarting the combustion operation after the C0 concentration detected by the C0 sensor reaches a predetermined dangerous concentration and the combustion is stopped by the CO safety device.
  • the combustion operation is easily restarted by the reset operation by the user without performing an inspection or the like.
  • the air flow is switched to the fan airflow control data in which the airflow is shifted in the increasing direction, that is, the combustion operation is restarted in a state where the combustion is improved, so that the combustion is necessary.
  • Sufficient air is supplied to perform combustion. As a result, the concentration of c ⁇ in the exhaust gas can be reduced, and the safety of CO poisoning against CO gas can be improved.
  • a stop constant ER for each concentration detected by the CO sensor is obtained, and each time the stop constant ER is calculated, the stop constant ER is integrated, and the integrated value is compared with a predetermined dangerous CO concentration value.
  • the accurate detection value of the dangerous state of the CO concentration taking into account each CO concentration comprehensively is obtained as the integrated value of the stop constant ER, and the C0 safe operation is performed. It is possible to perform highly reliable C0 safe operation.
  • the degree of indoor negative pressure is detected, and the fan air volume control data is adjusted according to the degree of indoor negative pressure.
  • a fan air volume control data switching control unit is set to switch to the air volume increasing direction when the degree of indoor negative pressure is large, and to set the air volume decreasing direction when the indoor negative pressure is released (or reduced). Therefore, since the fan airflow is controlled according to the degree of the negative pressure in the room, the insufficient air supply due to the negative pressure in the room is eliminated by increasing the airflow, and when the negative pressure in the room is released, the airflow is reduced in the downward direction. As a result, the air flow is controlled to eliminate the excess air flow, so that good combustion operation can be performed without being affected by changes in the indoor negative pressure condition.
  • the amount of combustion heat can be controlled over the entire control range.
  • the degree of indoor negative pressure can be accurately detected, and more accurate fan air volume control according to the degree of indoor negative pressure can be performed.
  • the fifth invention relates to post-fan control after the end of combustion in a negative pressure state. Even if the room is under negative pressure, it is necessary to set the fan speed (blowing capacity) high enough to ensure that the exhaust gas inside the combustion chamber is exhausted from the exhaust port to the outside. However, if the rotation speed of the fan is increased too much, there is a problem since supercooled water lower than the set temperature is discharged when a request for hot water supply is made again. Therefore, in the fifth invention, the post-fan control is a first-stage control in which the fan rotation speed is set to be high so that sufficient exhaust can be performed regardless of the negative pressure state in the room, and then the heat exchanger is cooled too much. The second stage control, in which the fan speed is set as low as possible, and the fan speed control, which is low enough to eliminate the initial fan rotation period before starting combustion when restarting the combustion operation, And a third stage control to be performed.
  • the hot water supply device adopts a forced exhaust type, which is installed indoors, supplies air in the indoors for combustion, and discharges exhaust gas after combustion to the outside through an exhaust pipe.
  • the water heater closes the faucet and temporarily stops tapping, and then reopens the tap within 5 minutes and restarts tapping. It has a so-called Q function that keeps it within 3 degrees above and below.
  • the housing 5111 which is the main body of the water heater 5110, has a box-like shape, and the right side of the housing 511 has a main body supply for taking in room air into the machine.
  • the spirit 5 1 2 has been established.
  • a filter 513 for removing dust and dust is attached inside the main body air supply port 511.
  • a combustion chamber 521 is provided at a substantially central portion in the housing 511, and a heat exchanger 522 for heating the water supply by heat obtained by burning the gas is disposed above the combustion chamber 5221. I have.
  • the heat exchanger 522 has a large number of fin plates attached to a pipe through which water is supplied, and is made of a member having good heat conductivity such as copper.
  • An exhaust port 5 23 is provided at the center of the upper surface of the combustion chamber 5 21, and an air supply port for taking in air that has flowed in from the main body air supply port 5 12 into the combustion chamber 5 2 1 at the bottom right. 24 are provided.
  • the exhaust port 5 2 3 of the combustion chamber 5 2 1 communicates with the exhaust pipe connecting section 5 2 6 protruding from the upper surface of the housing 5 1 1 through the exhaust duct 5 2 5.
  • An exhaust cylinder 527 leading to the outside is connected to the cylinder connection section 526.
  • the exhaust pipe 527 is attached to the exhaust pipe connecting section 526 by an operator when installing the water heater 510.
  • a combustion fan 531 for supplying / exhausting air to / from the combustion chamber 5221 is disposed in the middle of the exhaust duct section 5205, and an exhaust box 5 for performing functions such as reducing the flow velocity of exhaust gas is provided downstream thereof.
  • the combustion fan 531 is a centrifugal fan driven by a motor 5334 having a control circuit 5333 on the rear side, and exhausts exhaust gas from the exhaust port 5223 side of the combustion chamber 5221. Supply and exhaust.
  • a reverse wind plate 535 Inside the exhaust box 532, there is provided a reverse wind plate 535 for preventing the reverse wind from the exhaust pipe 5277 from flowing into the combustion chamber 5221.
  • a C 5 sensor 536 for detecting the concentration of carbon monoxide (CO) in the exhaust gas is attached to the side wall of the exhaust box 532.
  • an anti-vibration box 537 for preventing vibration caused by resonance of the air supplied and exhausted is provided.
  • the burners 541 receive gas for combustion through these. Further, an ignition device 546 is provided adjacent to the burner 541.
  • a water supply pipe 55 1 and a hot water supply pipe 55 2 are connected to the heat exchanger 52 2. Between the water supply pipe 5 5 1 and the hot water supply pipe 5 5 2, a bypass passage 5 5 3 for passing the water supply from the water supply pipe 5 5 1 to the hot water supply pipe 5 5 2 without passing through the heat exchanger 5 2 2 Is provided.
  • the bypass passage 553 By providing the bypass passage 553, the hot water heated by the heat exchanger 522 is mixed at a fixed rate with the water supplied from the water supply pipe 551, and after the temperature of the hot water is lowered, the hot water is discharged. It has become.
  • a water volume sensor 5 5 4 for detecting the presence or absence of water flow, a water input sensor 5 5 5 for detecting the temperature of the water supply, and a water filter for removing the contamination of the water supply 5 5 6 Is provided.
  • a water amount control valve 557 for controlling the amount of hot water, and the temperature of the hot water discharged from the hot water supply device 510.
  • To detect the hot water thermistor 5 5 8 is installed.
  • a main body operation part 5 61 1 "with various operation switches for performing operations on the water heater 5 110 such as temperature setting, and at the lower part, an exhaust pipe extension
  • An exhaust extension changeover switch 562 for setting and registering the distance at the time of installation is provided at an upper right end in the housing 511.
  • An electrical board 563 which controls various kinds of control of the water heater 5110 is provided. Is arranged.
  • a freezing prevention heater 571 for detecting the temperature of the hot water in the heat exchanger 522, and overheating prevention using a thermal fuse
  • a filter switch 574 for detecting a mounting error of the filter 513, and the like are provided.
  • FIG. 31 shows a circuit configuration of water heater 5 10.
  • the electric board 563 of the water heater 5110 is provided with a CPU (Central Processing Unit) 581, which performs a central function of various controls.
  • Various circuit devices are connected to the CPU 581 via various buses 582 such as a data bus and an address bus.
  • ROM (read only memory) 583 is a read-only memory that stores programs executed by the CPU 581 and various fixed data.
  • RAM (random access memory) 5884 is a working memory for storing data temporarily required to execute a program.
  • the bus 582 is connected to the main unit operation unit 561, and an input / output interface circuit unit 585 for inputting and outputting electric signals between various circuit devices and the CPU 581. .
  • Various electrical components such as an exhaust extension switching switch 62, a CO sensor 536, a combustion fan 531, and a water sensor 554 are connected to the input / output interface circuit 585.
  • FIG. 32 shows the flow of the operation performed by water heater 5 10.
  • the operator sets the extension distance of the exhaust pipe in the installed state by the exhaust extension switch 5 62.
  • the extension length of the exhaust stack is 4 meters or less (short distance mode), 4 meters or more and 7 meters or less (medium distance mode), or 7 meters or more and 13 meters or less (long distance mode). Configuration Is done.
  • the water heater 510 is in a standby state in which the Q function is maintained within 5 minutes after the previous stoppage of water supply, and after 5 minutes from the stop of water supply, the sleep state in which the Q function is not maintained become.
  • the water heater 5110 detects that the flow of water has started in the resting state by the water volume sensor 54 (step S101; Y)
  • the water heater 510 first starts the rotation drive of the combustion fan 531 (step S101).
  • Step S102 Thereafter, when the number of revolutions of the combustion fan 531 exceeds a predetermined number of revolutions required for ignition (here, 100 rpm) (step S103; Y), ignition is performed after a prepurge period.
  • the burner 41 is ignited by the device 546 (step S104).
  • step S105 After ignition of the burner 541, proportional control of the gas amount and the like is performed so that hot water at the set temperature is discharged until the flow of water is stopped (step S105). At this time, the rotation speed of the combustion fan 531 is controlled based on the concentration of carbon monoxide detected by the C ⁇ sensor 5336 so that an optimal air volume can be obtained.
  • the gas amount is detected using FF (feed forward amount) calculated from the flow rate, set temperature, and feed water temperature, or FB (feedback amount) calculated from the signal from the tapping thermistor 558. Can be performed.
  • the flow rate is measured by a water flow sensor 554, and the set temperature is a set value by a remote controller or the like.
  • the water supply temperature is measured by the input water thermistor.
  • the gas amount may be detected using a proportional valve current that determines the opening of the gas proportional valve 543.
  • Step S106 When the water supply is stopped (Step S106; Y), the combustion fan 5 is then operated until the 5 minutes to maintain the Q function elapse or until the water supply is resumed within 5 minutes. 31. Post-fan processing (step S107) for continuously rotating 1 is performed.
  • Post-fan processing is divided into three stages.
  • the first stage is a period during which exhaust gas remaining in the combustion chamber 521 and the exhaust stack 527 is exhausted outdoors, and a period during which the combustion fan 531 is rotated at high speed.
  • the second stage in order to maintain the water temperature in the heat exchanger 522 as long as possible within the temperature range that can satisfy the Q function, the number of revolutions of the combustion van 531 is reduced to some extent compared to the first stage. This is the period of rotation.
  • the third stage is However, after cooling the heat exchanger 22 to such an extent that hot water exceeding the allowable upper limit temperature is not discharged even when the combustion fan 5 31 is stopped, immediately after skipping the pre-purge period when passing water In this period, the combustion fan 531 is kept rotating at the lowest possible speed so that the burner 541 can be ignited.
  • the number of revolutions of the combustion fan 531 at each of these stages in the post-fan process and the revolution maintaining time at which the current stage revolution should be maintained until shifting to the next stage are determined by operating the ventilation fan indoors.
  • the pressure is changed depending on whether or not a negative pressure is generated so that the exhaust gas in the combustion chamber 521 is sucked into the chamber, and the extension distance of the exhaust pipe 527.
  • the longer the extension distance of the exhaust stack the more the exhaust resistance increases, and the higher the rotation speed of the combustion fan 531 required to obtain a constant air volume.
  • the longer the exhaust cylinder the longer the time required to finish discharging the remaining exhaust gas to the atmosphere. Therefore, the rotation speed of the combustion fan 531 and the rotation maintaining time of each stage are changed according to the set extension distance of the exhaust stack. Further, when a negative pressure is applied by a ventilator or the like to draw air in the combustion chamber 521 into the room, the air volume is reduced accordingly. Therefore, when a negative pressure is acting, the rotation speed of the combustion fan 531 is set higher than when there is no negative pressure, so that a necessary air volume is secured.
  • the ROM 583 stores in advance a non-illustrated data table in which the number of rotations of the combustion fan 531 and the rotation maintaining time in each of the first to third stages are associated with each other. .
  • the data table is prepared separately for cases where the exhaust cylinder extension distance is short-range mode, middle-distance mode, and long-distance mode with and without negative pressure.A total of six types of data tables are provided. Have been.
  • the data table to be referred to in this post fan process is selected from these six types based on the mode of the exhaust cylinder extension distance set at the time of installation and the presence or absence of negative pressure at the time of combustion stop.
  • the three types of data tables corresponding to the case where there is a negative pressure divide the data in the first stage into three according to the intensity of the negative pressure, and for each division, the number of rotations of the combustion fan 31 Etc. are registered.
  • the number of revolutions of the combustion fan 5 3 1 in the first stage registered in the data table Is the highest when the stack extension distance is in the long-distance mode, and is gradually lower in the order of the medium-distance mode and the short-distance mode.
  • the rotation speed of the combustion fan 531 is lowest when there is no negative pressure, and the higher the negative pressure intensity is, the higher the rotation speed is registered.
  • the longest rotation mode in the first stage registered in the data table is longest in the long-distance mode, and is gradually reduced in the order of the medium-distance mode and the short-distance mode.
  • the exhaust remaining in the combustion chamber 52 1 and the exhaust stack 5 27 can be exhausted to the outside without flowing back into the room, and A high rotation speed and a necessary rotation maintenance time that can sufficiently radiate the residual heat immediately after the stop of combustion so that the overshoot phenomenon does not occur are registered.
  • the first stage by registering the number of revolutions of the combustion fan in detail according to the negative pressure intensity in addition to the presence or absence of negative pressure, it is optimal to prevent exhaust backflow etc. according to the negative pressure intensity when combustion is stopped It is possible to select a different rotation speed.
  • the number of revolutions of the combustion fan 531 in the second stage registered in each data table is the same as that of the first data table registered in the same data table under the same conditions such as the mode of the exhaust cylinder extension distance and the presence or absence of negative pressure.
  • Each value is lower than the number of revolutions in each stage, and each is set so that the air volume is lower than in the first stage. Also, when comparing the second stage of the six types of evening tables, the longer the exhaust cylinder extension distance, the higher the number of revolutions, and the case where negative pressure is present is greater than when there is no negative pressure. High rpm is set.
  • the rotation speed of the combustion fan 531 in the second stage is set so that the cooling amount is reduced as much as possible within a range in which the hot water exceeding the allowable upper limit temperature is not discharged when the hot water is restarted.
  • the time during which the hot water in the heat exchanger 522 and the like can be maintained at a temperature higher than the allowable lower limit temperature becomes longer, and the Q function can be maintained for a longer time.
  • the minimum rotation speed that can be set regardless of the mode of the exhaust cylinder extension distance and the presence or absence of negative pressure is registered.
  • the third stage is a stage after the cooling of the heat exchanger 52 has advanced to such an extent that hot water exceeding the allowable upper limit temperature is not discharged even when the combustion fan 531 is stopped. Cooling It is not necessary to increase the air flow, regardless of the presence or absence of negative pressure and the mode of the exhaust cylinder extension distance
  • the total rotation maintenance time for the first to third stages is 5 minutes for any data table regardless of the mode of exhaust stack extension distance or the presence or absence of negative pressure.
  • the rotation speed of the combustion fan 531 in the first and second stages is set to be higher when there is a negative pressure than when there is no negative pressure. Even if a negative pressure acts to draw exhaust gas from the combustion chamber 52 1 into the room, the combustion fan 531 rotates at a higher speed, and the air volume itself is almost constant regardless of the negative pressure. Is kept. As a result, even if a negative pressure exists, exhaust gas is prevented from flowing back into the room, and when there is no negative pressure, an excessive amount of air is not generated, so that the heat exchanger 522 is subcooled. And the Q function can be maintained for a longer time.
  • the number of rotations of the combustion fan is finely set according to the magnitude of the negative pressure intensity in addition to the presence or absence of negative pressure, so that exhaust backflow is prevented according to the negative pressure intensity when combustion is stopped
  • the optimum rotation speed is selected to prevent excessive cooling.
  • Figure 33 shows the correspondence between the amount of gas burned during combustion and the number of revolutions of the combustion fan.
  • Four types of operation modes of the water heater 5100 are provided: a normal mode, a first improvement mode, a second improvement mode, and a third improvement mode.
  • the lowermost graph 91 corresponds to the normal mode
  • the upper graphs 92, 93, and 94 correspond to the first improvement mode, the second improvement mode, and the third improvement mode, respectively. It corresponds to the mode.
  • the graphs 91 to 94 that determine the rotation speed of the combustion fan 531 in each operation mode show that the required supply / exhaust amount increases with an increase in the gas combustion amount. It is set to increase the rotation speed of 1. The number of revolutions of the combustion fan 531 is determined by the set operation mode and the gas combustion amount at that time.
  • the normal mode is an operation mode corresponding to the case where negative pressure is not applied by a ventilation fan etc.
  • the water heater 5110 operates so that the carbon monoxide concentration falls within an appropriate range by rotating the combustion fan 531 in accordance with the mode.
  • the first improvement mode corresponds to a case where the rotation speed of the combustion fan 531 must be set to be somewhat higher than that in the normal mode in order to keep the carbon monoxide concentration in an appropriate range. In other words, it corresponds to the case where some negative pressure acts and the rotation speed of the combustion fan 531 needs to be set high enough to cancel the negative pressure.
  • the second improvement mode is used when a stronger negative pressure is applied compared to the first improvement mode
  • the third improvement mode is used when a stronger negative pressure is applied than the second improvement mode. This is a corresponding operation mode.
  • the mode of operation changes sequentially during combustion depending on whether the carbon monoxide concentration is in the proper range.
  • the presence or absence of a negative pressure and the negative pressure intensity are determined based on the number of revolutions of the combustion fan 531 required to maintain the concentration of carbon monoxide detected by the C ⁇ sensor 5336 in an optimum range. Has been determined. More specifically, the negative pressure intensity is determined based on which operation mode is set immediately before the stop of combustion.
  • the presence or absence of the negative pressure and the magnitude of the negative pressure intensity are detected during the burning of the burner 541, while the step S105 in FIG. 32 is being executed. Based on the operation mode immediately before the stop of the combustion, the presence or absence of the negative pressure and the negative pressure intensity after the stop of the combustion are estimated, and the rotation speed of the combustion fan 531 after the stop of the combustion is selected.
  • Negative pressure here refers to any action against the action of the combustion fan trying to discharge exhaust gas to the outside of the room.In addition to suction by the ventilation fan, backflow due to strong wind, etc. Exhaust passage pressure loss is also included.
  • FIG. 34 shows a flow of the operation performed by the water heater 5110 in the post-fan processing.
  • step S301 the number of revolutions of the combustion fan 531 in each of the first stage, the second stage, and the third stage, and the time to maintain each stage are determined. That is, one of the six data tables described above is selected based on the presence / absence of a negative pressure immediately before the stop of combustion and the exhaust cylinder extension distance set at the time of installation.
  • the combustion fan 531 is rotated at the first stage rotation speed according to the value registered in the selected data table (step S302), and the time to shift to the second stage is obtained. Until the arrival (Step S303; N), the rotation speed is maintained.
  • step S304 if water flow is confirmed before moving to the second stage (step S304; Y), the flow returns to step S104 in Fig. 32, and the burner 41 is immediately ignited.
  • the number of revolutions of the combustion fan 531 in the first stage is selected according to not only the presence or absence of the negative pressure but also the magnitude of the negative pressure intensity.
  • the exhaust remaining in the combustion chamber 521 and the exhaust pipe 527 after the combustion is stopped is discharged outside through the exhaust pipe 527.
  • the rotation speed at this time is set in consideration of not only the presence / absence of a negative pressure and the length of the exhaust cylinder extension but also the magnitude of the negative pressure strength, even when the ventilation fan or the like is operating, the exhaust air is indoors. It is possible to secure the necessary air volume so as not to flow backward.
  • the combustion fan 531 at high speed the residual heat after the combustion was stopped can be efficiently radiated, and the water flow was restarted relatively shortly after the combustion was stopped (while continuing the first stage). Even so, hot water can be supplied without causing an overshoot phenomenon.
  • Step S305 the number of revolutions of the combustion fan 531 is reduced to the second-stage rotation speed
  • Step S305 the number of revolutions of the combustion fan 531 is reduced to the second-stage rotation speed
  • step S306 N
  • the number of revolutions of the combustion fan 31 is reduced compared to the first stage, so that the supercooling of the heat exchanger 522 is prevented and the Q function is maintained for a longer time can do.
  • step S306; Y When the rotation maintaining time of the second stage has elapsed (step S306; Y), the rotational speed of the combustion fan 531 is reduced to the rotational speed of the third stage (step S308), and the rotation speed of the third stage is reduced. The rotation speed is maintained until the rotation maintaining time of the step elapses (step S309; N). In this way, the rotation of the combustion fan 31 is maintained at the number of revolutions required for ignition, so that the burner 541 can be ignited almost simultaneously with the detection of water flow, regardless of when water flow is resumed, and water that is not heated It is possible to prevent the occurrence of an undershoot phenomenon, which occurs from the water heater 5110.
  • step S309; Y When the rotation maintaining time of the third stage has elapsed (step S309; Y), the rotation of the combustion fan 531 is stopped (step S311), and the post-fan processing is completed. The process returns to the indicated step S101 to be in the sleep state. After that, when there is water flow, a pre-purging process is performed to confirm that the rotation of the combustion fan 531 has reached a specified speed, and then the burner 541 is ignited.
  • step S307 When water flow is resumed in the middle of the second and third stages (step S307; Y or step S310; ⁇ ⁇ ), as in the first stage, Return to step S104 and immediately ignite burner 541.
  • the number of revolutions of the combustion fan 31 is reduced stepwise in the post-fan processing. However, in the second and subsequent stages, the number of revolutions of the combustion fan 31 is reduced gradually. You may.
  • the rotation speed of the combustion fan 531 in the first stage is changed according to the magnitude of the negative pressure, but the rotation speed of the combustion fan 531 in the second and subsequent stages is also changed to the negative pressure. You may make it set finely according to the magnitude of intensity
  • the reason for considering the negative pressure intensity in the first stage is to prevent the backflow of exhaust gas properly regardless of the magnitude of the negative pressure. If the rotation speed of the combustion fan 531 is controlled in consideration of the strength, the Q function can be maintained for a longer time.
  • the rotation speed of the combustion fan 5 The rotation maintenance time at this stage was registered in the data table in advance, but the presence or absence of negative pressure, the length of the exhaust stack, and the temperature of the heat exchanger 5
  • the rotation speed and the rotation maintaining time of the combustion fan 531 may be dynamically controlled based on the above.
  • the combustion fan 531 is rotated at a rotation speed at which the amount of heat radiation is minimized within a range in which hot water exceeding the allowable upper limit temperature is not discharged.
  • combustion is performed so that the temperature of the hot water in the heat exchanger 522 is maintained as high as possible without exceeding the upper limit of the allowable range.
  • the number of rotations of the combustion fan 531 is controlled so that the number of rotations is as low as possible.
  • the presence or absence of the negative pressure is detected based on the concentration of carbon monoxide detected immediately before the stop of the combustion, but may be detected by a separately provided negative pressure sensor. Good. Further, the presence or absence of negative pressure and the magnitude of exhaust resistance may be detected based on the amount of current required when rotating the combustion fan 531 at a predetermined rotation speed.
  • a negative pressure when a negative pressure is generated by a ventilation fan or the like, the exhaust resistance increases and the amount of air blows decreases even at the same rotation speed, so that the amount of current required to rotate the combustion fan 531 at a certain rotation speed or Power consumption is reduced.
  • the presence or absence of a negative pressure can be detected based on the current rotational speed and the current amount at that time. In this case, it is possible to detect the presence or absence of a negative pressure even after the combustion has stopped.
  • a method is employed in which combustion exhaust is sucked from the exhaust side of the combustion chamber 521, but a forced exhaust system is employed in which indoor air is taken in for combustion and exhaust is discharged to the outside.
  • the combustion air may be pushed in from the air supply side of the combustion chamber 52 1.
  • the smaller the combustion amount the more easily the effect of air shortage occurs. Therefore, the relationship between the combustion amount and the fan speed shown in 33 may be as shown by the dotted line.
  • the water heater according to the fifth embodiment of the present invention it is detected whether or not a negative pressure for sucking air in the combustion chamber into the room is generated, and the number of rotations of the combustion fan after stopping the combustion is detected. Is changed according to the presence or absence of a negative pressure, so that it is possible to prevent exhaust gas from flowing back into the room even when the room is in a negative pressure state.
  • the combustion fan is initially driven at a high speed. Can be prevented from occurring.
  • the rotation of the combustion fan is gradually reduced as time elapses after stopping the combustion, so that the heat exchanger is not overcooled in a short time, and the Q function can be maintained for a longer time.
  • the combustion fan rotation was maintained at a configurable minimum speed, so that when tapping was resumed, the burner could be ignited immediately and the unheated water was temporarily removed. It is possible to prevent the occurrence of the undershoot phenomenon due to the erroneous appearance.
  • the sixth invention relates to a structure of a check valve at an exhaust port.
  • the exhaust gas from the combustion chamber provided in the appliance case is provided at the most downstream of the exhaust path communicating with the combustion chamber. It was forced through a cylinder and by a combustion fan.
  • a chimney force having an inner diameter substantially equal to that of the exhaust stack.
  • the tip of this chimney extends to the outside, and when the combustion fan is stopped or when the wind is strong, the exhaust air may flow back into the appliance case through the exhaust pipe due to the air blown from the chimney tip opening. There is.
  • Such backflow of exhaust gas causes a problem that dust and the like mixed in the backflow air adhere to the inner wall of the combustion chamber, thereby causing poor combustion.
  • a so-called bath fly valve is provided inside the exhaust stack so as to close in a direction in which exhaust gas does not flow backward.
  • An exhaust sensor for detecting a combustion abnormality is provided at an appropriate position in the exhaust path, and the information obtained from the exhaust sensor is comprehensively analyzed to control the rotation of the combustion fan.
  • the state of the exhaust gas discharged from the combustion chamber varies depending on the position in the exhaust path.Therefore, a special member to reduce this is provided in the exhaust path, and the optimal installation location of the exhaust sensor is determined. It was necessary to select through various experiments, which led to an increase in cost and an increase in design man-hours.
  • FIG. 35 to FIG. 43 show an embodiment of the sixth invention.
  • the combustion device 6 10 according to the present embodiment is a gas water heater of a gas forced exhaust combustion type installed indoors.
  • a combustion chamber 6300, a combustion fan 636 for air supply and exhaust, a control device for controlling the combustion operation, and the like are housed in the appliance case 611 of the combustion device 610. It is configured to take in air from the intake opening 613 provided in the front cover 6111B, and discharge the exhaust gas after combustion outside through the exhaust pipe 6444. As shown in FIG.
  • the instrument case 6 11 is composed of a box-shaped case body 6 11 A with an open front side, and a detachable front cover 6 that covers the front side opening of the case body 6 11 A. 1 1B.
  • a notch 6 12 through which the exhaust pipe 6 4 4 passes is formed in the ceiling wall of the case body 6 11 A.
  • An intake opening 613 for taking in combustion air is provided in a horizontally-long rectangular shape at a position below the approximate center of the front cover 611B.
  • the intake opening 6 13 is provided with an intake filter 6 14 for preventing intrusion of dust and the like.
  • An opening 615 for a remote controller is provided below one end of the opening 615 for intake.
  • the opening 615 is immovably positioned when the remote controller 616 matches, and the operation surface of the remote controller 616 is exposed outside the instrument case 611.
  • the remote control 616 is provided with various switches for predetermined operations such as ONZOFF of combustion operation and designation of a set temperature of hot water supply.
  • a heat exchanger 631 for warming water with heat obtained by burning gas is disposed above a combustion chamber 630 in the case body 611A.
  • a burner connected to a gas supply pipe is provided in the combustion chamber 63 0, and a water supply pipe 6 33 and a hot water supply pipe 6 32 are connected to the heat exchanger 63 1.
  • an anti-vibration box 634 is provided beside the combustion chamber 630 and the heat exchanger 631.
  • an exhaust case 635 for exhausting exhaust gas from the combustion chamber 630 is provided, and the exhaust case 6353 is rotated by a motor 6337.
  • a suction port for a driven combustion fan 636 is provided.
  • the exhaust case 635 is connected to a chamber room 640 provided above the vibration isolating box 34 via an exhaust duct 358.
  • an exhaust case 635, an exhaust duct 638, a chamber 640, and an exhaust pipe 644 constitute an exhaust path.
  • the chamber 640 is a box-shaped space formed in the shape shown in FIGS. 35 to 384, and has a larger cross-sectional area perpendicular to the exhaust gas flow direction than that of the exhaust duct 636. In addition, it has a function to reduce the flow velocity of the exhaust flow from the combustion fan 636.
  • a square exhaust inlet 642 is opened in the front wall 641 of the chamber room 64, and an exhaust duct 638 is connected to the exhaust inlet 642. Further, an exhaust pipe 644 projecting upward from the instrument case 611 is connected to the ceiling wall 644.
  • the exhaust port 644 of the chamber 640 is displaced between an open state in which the exhaust port 644 is opened and exhaust gas is introduced, and a closed state in which the exhaust port 644 is closed to prevent exhaust gas from flowing back.
  • a possible non-return valve 650 is provided. More specifically, the non-return valve 650 pivots via a pivot pin 652 with respect to a guide member 653 fixed above the upper end edge of the exhaust port 642. Supported.
  • the check valve 65 is made of a plate processed into a shape having a size that can block the exhaust port 642, and the upper edge 65 Oa has a pivot shaft.
  • a knuckle portion 651 through which the pin 652 is inserted in the left-right direction is formed.
  • the guide member 653 is provided with mounting pieces 6554a, 6554b for fixing above the upper edge of the exhaust port 642, and a pivot pin. And a cover portion 655 in which a rotating hole 56 through which the hole 652 is inserted is formed.
  • An exhaust sensor 661 for detecting the concentration of carbon monoxide in the exhaust gas is attached to one end of the upper end of the chamber 640.
  • a sensor case 660 shown in FIG. 44 may be provided at a position shown by a two-dot broken line in FIG.
  • the check ring 65 When the check ring 65 is in the closed state, there is a gap between the exhaust inlet 642 and the check ring 65, but above the guide hole, as shown in FIG.
  • the member 653 By the member 653, the other three sides are closed by the cut-and-raised exhaust inlet 642 shown in FIG.
  • a cover member 62 is attached to one side wall of the case body 611A, and a control device is housed inside the cover member 62.
  • the controller mainly controls the combustion operation by variably controlling the gas supply amount so as to produce hot water at the set temperature, and controlling the rotation of the combustion fan 636 to match the gas amount.
  • Yes consists of a microcomputer including a CPU, ROM, RAM, etc.
  • the exhaust generated in the combustion chamber 6 30 is first guided to the exhaust case 6 35 by the rotation of the combustion fan 6 36, and then the exhaust duct 6 3 8
  • the exhaust gas is guided to the chamber 640 through the chamber 640, and the flow velocity of the exhaust flow decreases in the chamber 640, and is finally discharged from the exhaust pipe 644 to the outside of the instrument case 611.
  • the exhaust pressure causes the check valve 650 at the exhaust inlet 624 of the chamber 640 to move to the pivot pin 65. It swings easily and upwardly around the center of rotation of 2 to guide the exhaust gas smoothly into the chamber 640.
  • the non-return valve 650 is located inside the exhaust pipe 644 having a relatively narrow flow path as in the prior art, so that there is no extra resistance to the exhaust flow, and the chamber chamber 640 having a wide flow path is provided. Since the check valve opens and closes, the loss of pressure at the time of exhaustion due to the check valve itself can be minimized.
  • the check valve 6550 When the exhaust gas does not flow into the chamber chamber 64 from the exhaust inlet 642, the check valve 6550 is closed by its own weight. Also, when a strong wind is blown in the reverse flow direction from the exhaust pipe 644, the check valve 650 is locked in the closed state. With such a simple configuration, it is possible to reliably prevent the backflow of the outdoor air in the exhaust path in the chamber chamber 640.
  • the exhaust flow does not directly hit the periphery of the exhaust sensor 661, as shown in FIG.
  • the exhaust gas sensor 661 can accurately detect the exhaust gas condition such as the concentration of carbon monoxide.
  • the combustion device according to the present invention is not limited to the above-described embodiment, and may have various specific configurations.
  • the exhaust port of the chamber and the check valve for opening and closing the exhaust port may be used. However, it is not limited to the illustrated shape and size. Further, in the present embodiment, the combustion device is described as a water heater, but may be applied to other devices such as a bath kettle and a heater.
  • the exhaust gas flows from the exhaust stack upstream of the exhaust stack.
  • a chamber with a large passage area is provided.
  • the seventh invention relates to a combustion device capable of detecting a negative pressure state in a room with high sensitivity, and relates to a combustion device detecting a negative pressure state in a room using the flame rod current described above.
  • a seventh invention is a combustion device capable of effectively detecting a negative pressure state in a room by using the flame rod current.
  • the flame shown in Fig. 7 has high resistance to external flames and low resistance to internal flames. Therefore, when a constant voltage is applied to the electrode pair of the frame rod, the current is low when the electrode pair of the frame rod is located in the external flame, and the current is low when the electrode pair of the frame rod is located in the internal flame. Get higher. Therefore, first, as shown in Fig. 6 and Fig. 10, when the flame load current exceeds the upper threshold, the room is in a negative pressure state, and when the flame load current falls below the lower threshold, the room reduces the negative pressure. State, that is, normal state
  • the fixed threshold value shown in FIG. 10 is used, for example, for determining when the combustion device is ignited.
  • the variable threshold shown in Fig. 10 is used for judgment during combustion control after ignition.
  • FIG. 45 shows a modified example in the case where the negative pressure state in the room and its release are detected by the flame rod current of the seventh invention.
  • two frame rod electrode pairs F 1 and F 2 having different heights are provided near the burner 8.
  • 1 and? 2 indicates a frame rod electrode pair.
  • the flame size differs depending on the combustion capacity, so that the frame rods with different heights are used to detect the negative pressure state and its release with high accuracy over a wide range of combustion capacity.
  • An electrode pair is provided.
  • the frame rod electrode pair F1 is arranged such that its tip is located in the external flame in a low combustion capacity state.
  • the frame rod electrode pair F2 is arranged such that its tip is located in the outer flame in a high combustion capacity state.
  • the negative pressure state and its release are detected mainly in accordance with the flame rod current from the frame rod electrode pair F1.
  • the combustion capacity is high, mainly the flame rod electrode pair F 2
  • the negative pressure state and its release are detected according to these frame rod currents. As a result, highly sensitive detection can be achieved.
  • FIG. 46 is a schematic circuit diagram for supplying a voltage V in to the frame rod electrode pair.
  • a commercial AC voltage AC is supplied to an input power supply circuit 700 in the combustion device, and the input power supply circuit 700 outputs a DC voltage Vout. Further, this DC voltage Vout generates an input voltage Vin that is optimal for the frame rod electrode pair FR by the transformer 720.
  • the DC voltage V 0 ut or the input voltage V in may fluctuate due to fluctuations in the commercial power supply.
  • the frame rod current fluctuates with the fluctuation of the voltage V out or V in. Such fluctuations may cause erroneous detection of the above-described negative pressure state or negative pressure release.
  • FIG. 48 is a diagram showing the flame rod current with respect to the combustion capacity.
  • the solid line b shows the current value when the appropriate input voltage V in is given to the frame rod electrode pair.
  • the frame current at that time rises as shown by the dashed line a.
  • the frame rod current at that time decreases as indicated by the dashed line c. Therefore, for example, when the input voltage V in rises, it is expected that the frame rod current IPa exceeding the upper threshold value indicated by the broken line is detected, and the negative pressure state is erroneously determined.
  • the correction is performed using the correction value K in FIG. 47 so that the frame rod current I pa becomes the correct current I pb.
  • the combustion device is controlled by a control board using a microcomputer. Therefore, after the control to change the combustion capacity is performed, the opening of the proportional valve is opened, and accordingly, the flame increases, and a certain system delay time is required until the flame rod current rises and is detected.
  • FIG. 49 shows that the actual frame rod current 712 lags the time on the horizontal axis with respect to the gas amount control command 710 shown by the solid line.
  • the frame rod current 712 follows the gas amount control command 710 with a delay of the delay time Ts.
  • An upper threshold value Pu and a lower threshold value PL of the frame rod current are set in advance for each of the gas amounts 710. Therefore, in the present embodiment, the detected frame rod current 712 is determined by the upper and lower thresholds P with respect to the gas amount 7 10 at a time before the system delay time T s from the time of the detection (at this time).
  • a comparison is made based on U1 and PL1 to determine whether the state is a negative pressure state or negative pressure release.
  • FIG. 50 is a diagram for explaining a delay time in detecting whether a negative pressure state or a negative pressure release is performed in accordance with a change in the frame ⁇ current.
  • T s the system delay time
  • TG the delay time required from the time when the frame rod detects a variable change to the time when the accompanying change in the frame rod current is detected. Therefore, as shown in FIG. 50, the amount of change in the frame load current within the time Tth period, which is just before the delay time TG from the current time, is detected, and the negative pressure state and the negative pressure release described above are detected. It is preferable to detect any one of the following and a sudden negative pressure state.
  • the method of monitoring changes in flame rod current is a simpler method for detecting negative pressure because it is not necessary to consider the magnitude of the combustion capacity.
  • the state of the flame also changes at the same time.
  • the change in the flame current in the transient state does not reflect the negative pressure state or the negative pressure release in the room. Therefore, in order to eliminate such noise, when the combustion capacity is changed, the negative pressure monitoring based on the change in the flame rod current is not performed until the state of the opening of the gas proportional valve is stabilized.
  • FIG. 51 is a diagram showing the relationship between the proportional valve opening and time when the combustion capacity is changed. If the proportional valve opening greatly fluctuates for a predetermined period TW from the reference point before the delay time TD required for proportional valve control from the present time, negative pressure monitoring is performed based on the change in the frame rod current at that time. Absent.
  • the negative pressure state in the room and its release can be efficiently detected in a short time using the frame rod current. Therefore, this frame is used in indoor-installed combustion devices that need to perform combustion control according to the indoor negative pressure state. Providing a negative pressure monitoring mechanism using the mud current enables more accurate combustion control. Industrial applicability
  • the combustion device or the water heater according to the present invention can solve various problems caused by a negative pressure in the room when installed in the room.
  • a negative pressure in the room even if the room is in a negative pressure state, it is possible to ignite the wrench under optimal air volume control, and to reduce ignition errors.
  • the combustion capacity is reduced in a negative pressure state in the room, it is possible to temporarily avoid a state of insufficient supply air volume.
  • the supply airflow is controlled to a high level to prevent poisoning of carbon monoxide. be able to.
  • a simple check valve is provided to eliminate pressure loss in a normal exhaust state, and to reliably prevent a reverse flow from the exhaust port even when the room is in a negative pressure state.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Regulation And Control Of Combustion (AREA)

Abstract

Il est possible de réduire les raté d'allumage du brûleur d'un appareil de combustion en optimisant le réglage du volume d'air fourni lors de l'allumage du brûleur au début de la combustion en fonction de la dépression régnant dans une chambre. De plus, pendant le réglage de la combustion, l'appareil mesure la dépression régnant dans la chambre à l'aide du courant d'un thermocouple et du signal de sortie d'un capteur de CO pour accroître le volume d'air fourni pendant un certain temps, ce qui retarde l'annulation de la dépression lorsque la capacité de combustion baisse, et évite le déficit en air admis. D'autre part, l'échappement des gaz de combustion de la chambre s'effectue de manière sure à l'aide d'un ventilateur placé après la combustion et réglant la quantité d'air admis en fonction de la dépression régnant dans la chambre. En outre un clapet anti-retour se fermant par gravité et s'ouvrant en fonction de la pression des gaz d'échappement et placé sur le trajet des gaz d'échappement empêche le reflux desdits gaz dans la chambre de combustion par l'orifice d'échappement quand la pression dans la chambre devient négative. Enfin le courant du thermocouple détecte la dépression dans la chambre et l'annulation de la dépression et agit sur le réglage du débit d'air du ventilateur de combustion pour le maintenir à un niveau optimum.
PCT/JP1998/000606 1997-02-14 1998-02-13 Appareil de combustion WO1998036219A1 (fr)

Applications Claiming Priority (20)

Application Number Priority Date Filing Date Title
JP3037397A JPH10227452A (ja) 1997-02-14 1997-02-14 給湯機 および給湯機制御方法
JP9/30373 1997-02-14
JP3593797A JPH10232015A (ja) 1997-02-20 1997-02-20 燃焼装置
JP9/35937 1997-02-20
JP5824797A JP3673361B2 (ja) 1997-02-26 1997-02-26 燃焼装置
JP9/58247 1997-02-26
JP06242697A JP3727437B2 (ja) 1997-02-28 1997-02-28 燃焼機器およびその点火方法
JP9/61785 1997-02-28
JP9/61784 1997-02-28
JP06178597A JP3777011B2 (ja) 1997-02-28 1997-02-28 燃焼装置
JP06178497A JP3810174B2 (ja) 1997-02-28 1997-02-28 燃焼装置
JP9/62426 1997-02-28
JP9/62424 1997-02-28
JP9/62425 1997-02-28
JP06242497A JP3673362B2 (ja) 1997-02-28 1997-02-28 燃焼機器
JP06242597A JP3673363B2 (ja) 1997-02-28 1997-02-28 燃焼機器
JP9/93203 1997-03-27
JP09320397A JP3736929B2 (ja) 1997-03-27 1997-03-27 燃焼装置
JP9/106771 1997-04-09
JP10677197A JPH10281459A (ja) 1997-04-09 1997-04-09 燃焼機器

Publications (1)

Publication Number Publication Date
WO1998036219A1 true WO1998036219A1 (fr) 1998-08-20

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ID=27579830

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Application Number Title Priority Date Filing Date
PCT/JP1998/000606 WO1998036219A1 (fr) 1997-02-14 1998-02-13 Appareil de combustion

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Country Link
WO (1) WO1998036219A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111649356A (zh) * 2020-06-10 2020-09-11 绍兴市升博厨房电器有限公司 燃气灶工作方法及燃气灶
CN111699346A (zh) * 2018-02-19 2020-09-22 株式会社能率 燃烧装置
CN113883911A (zh) * 2021-11-03 2022-01-04 北京泓泰天诚科技有限公司 常减压加热炉控风方法和***

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202011A (ja) * 1985-03-01 1986-09-06 Sanyo Electric Co Ltd 強制給排気式燃焼器
JPS63184340U (fr) * 1987-05-20 1988-11-28
JPH0814553A (ja) * 1994-07-04 1996-01-19 Gastar Corp Ｃｏ検出センサ付燃焼機器の断続燃焼時の燃焼制御方法およびその装置
JPH0835654A (ja) * 1994-07-23 1996-02-06 Takagi Ind Co Ltd 燃焼装置及び燃焼制御方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61202011A (ja) * 1985-03-01 1986-09-06 Sanyo Electric Co Ltd 強制給排気式燃焼器
JPS63184340U (fr) * 1987-05-20 1988-11-28
JPH0814553A (ja) * 1994-07-04 1996-01-19 Gastar Corp Ｃｏ検出センサ付燃焼機器の断続燃焼時の燃焼制御方法およびその装置
JPH0835654A (ja) * 1994-07-23 1996-02-06 Takagi Ind Co Ltd 燃焼装置及び燃焼制御方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111699346A (zh) * 2018-02-19 2020-09-22 株式会社能率 燃烧装置
CN111699346B (zh) * 2018-02-19 2022-02-25 株式会社能率 燃烧装置
CN111649356A (zh) * 2020-06-10 2020-09-11 绍兴市升博厨房电器有限公司 燃气灶工作方法及燃气灶
CN113883911A (zh) * 2021-11-03 2022-01-04 北京泓泰天诚科技有限公司 常减压加热炉控风方法和***

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