CN111947317B - Fully-premixed gas water heater and control method - Google Patents
Fully-premixed gas water heater and control method Download PDFInfo
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- CN111947317B CN111947317B CN202010712335.1A CN202010712335A CN111947317B CN 111947317 B CN111947317 B CN 111947317B CN 202010712335 A CN202010712335 A CN 202010712335A CN 111947317 B CN111947317 B CN 111947317B
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- water heater
- gas water
- fan
- airflow
- fully premixed
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 209
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 claims abstract description 93
- 239000007789 gas Substances 0.000 claims description 138
- 239000000779 smoke Substances 0.000 claims description 48
- 239000000446 fuel Substances 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 17
- 230000008859 change Effects 0.000 claims description 8
- 239000003517 fume Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/0027—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters using fluid fuel
Abstract
The invention belongs to the technical field of gas water heaters, and particularly relates to a full-premix gas water heater and a control method. The full-premixing component of the full-premixing gas water heater is connected with the combustor through a fan, and the heat exchange component is connected with the combustor; the airflow throttling component is positioned on the airflow channel at the rear end of the full premixing component and is used for adjusting the opening of the airflow channel so as to realize the adjustment of the positive pressure at the rear end of the full premixing component; the full premixing component, the fan and the airflow throttling component are electrically connected with the control unit. The control method firstly judges whether the required combustion load is not less than P or not on the premise of the maximum opening of the airflow channelnmin(ii) a If yes, adjusting the fan; if not, firstly adjusting the airflow throttling component to enable the opening degree of the actual airflow channel to be minimum, and then adjusting the fan. The invention effectively solves the problem that the minimum combustion load of the prior full-premix gas water heater is larger.
Description
Technical Field
The invention belongs to the technical field of gas water heaters, and particularly relates to a full-premix gas water heater and a control method.
Background
The gas water heater is equipment which takes gas as fuel and quickly prepares hot water through gas combustion; the fully premixed gas water heater burns after gas and air are completely mixed before the water heater burns, and no secondary air participates in the burning process, so that the gas water heater adopting the burning mode is called as a fully premixed gas water heater.
At present, an air-fuel proportional valve structure is generally adopted by a low-power (below 50 KW) full-premix gas water heater, negative pressure is generated at the rear end of gas of the air-fuel proportional valve by virtue of a Venturi premixer and a fan, and the negative pressure at the rear end of the air-fuel proportional valve is adjusted by changing the rotating speed of the fan, so that the combustion load of the full-premix gas water heater is adjusted. For example, the larger the fan rotation speed is, the larger the generated negative pressure is, the larger the opening degree of the air-fuel proportional valve is, and the larger the combustion load is; otherwise, the size becomes smaller.
However, this type of load adjustment also has its own disadvantage in that the minimum value of the load adjustment ratio (the ratio of the minimum combustion load to the maximum combustion load) is generally 1:5, i.e., the minimum value of the load adjustment ratio is relatively large. The reason is that the rotating speed of the fan can not be infinitely low, the rotating speed of the existing fan can only be about 1000r/min generally, so that the minimum combustion load of the full premix gas water heater is too high, and the minimum value of the load regulation ratio is larger, so that the water outlet temperature of the water heater is too high when people take a bath in summer, and the comfort of the user in using the full premix gas water heater is influenced.
Disclosure of Invention
In order to solve the problem that the minimum combustion load of the existing full-premix gas water heater is large, the invention provides a full-premix gas water heater.
Another object of the present invention is to provide a control method for the fully premixed gas water heater.
The invention is realized by adopting the following scheme:
the invention discloses a full-premix gas water heater, which comprises a full-premix component, a fan, a burner, an airflow throttling component, an airflow channel and a control unit, wherein the full-premix component is used for premixing gas and air to form full-premix gas;
the air inlet of the fan is connected with the air outlet end of the full premixing component, and the air outlet of the fan is connected with the combustor; the heat exchange assembly is connected with the combustor; the airflow throttling assembly is positioned on an airflow channel at the rear end of the full premixing assembly and used for adjusting the opening of the airflow channel so as to realize the adjustment of the positive pressure at the rear end of the full premixing assembly;
the full premixing component, the fan and the airflow throttling component are electrically connected with the control unit.
The fully premixed gas water heater is further improved in that the fully premixed gas water heater also comprises a smoke collecting hood, a smoke exhaust pipe and a heat exchange assembly;
the heat exchange assembly is connected with the combustor, the collection petticoat pipe with heat exchange assembly connects, the pipe of discharging fume is installed the smoke vent department of collection petticoat pipe, airflow throttling component installs be used for the adjustment in the smoke vent pipe the aperture of discharging fume the pipe is in order to realize the adjustment the positive pressure of full premix subassembly rear end.
In a further development of the fully premixed gas water heater of the present invention, the airflow throttling assembly is mounted at one end of the smoke exhaust pipe adjacent the smoke collection hood.
In a further improvement of the fully premixed gas water heater of the present invention, the air throttle assembly comprises an air valve, a drive member connected to the air valve; the airflow valve is positioned in the airflow channel, and the driving piece is electrically connected with the control unit and used for driving the airflow valve to move so as to adjust the opening degree of the airflow channel.
The fully premixed gas water heater is further improved in that the driving piece is electrically connected with the control unit and used for driving the airflow valve to rotate so as to adjust the opening degree of the airflow channel.
The fully premixed gas water heater is further improved in that the airflow valve comprises a rotating shaft and a door body connected with the rotating shaft; the rotating shaft and the door body are both arranged in the airflow channel in the radial direction, and the driving piece is connected with the rotating shaft and used for driving the door body to rotate so as to change the opening degree of the airflow channel.
The full-premixing gas water heater is further improved in that the full-premixing component comprises an air-fuel ratio valve and a Venturi premixer for injecting air;
the air-fuel proportional valve is arranged on the gas pipe and is communicated with a gas inlet of the Venturi premixer, and the gas outlet end of the Venturi premixer is also communicated with an air inlet of the fan; the air-fuel ratio valve is electrically connected with the control unit.
The fully premixed gas water heater is further improved in that the heat exchange assembly comprises a heat exchanger, a cold water pipe and a hot water pipe; the cold water pipe is communicated with a cold water inlet of the heat exchanger, and the hot water pipe is communicated with a hot water outlet pipe of the heat exchanger.
The fully premixed gas water heater is further improved in that the fully premixed gas water heater also comprises an outlet water temperature detection unit, an inlet water temperature detection unit and a water flow detection unit which are electrically connected with the control unit; the outlet water temperature detection unit is installed on the hot water pipe, the inlet water temperature detection unit is installed on the cold water pipe, and the water flow detection unit is installed on the water flow channel.
The fully premixed gas water heater is further improved in that the motor is a direct current variable frequency fan.
The invention discloses a control method of a fully premixed gas water heater, which comprises the following steps:
starting the fully premixed gas water heater and calculating the required combustion load P of the fully premixed gas water heater1；
If P1≥PnminMaintaining the maximum opening S of the airflow passagemaxWhile adjusting the speed of the fan to make the actual combustion load P2To achieve the required combustion load P1To date, Pnmin＜P2≤Pmax；
If P1＜PnminAdjusting the airflow throttling component to enable the opening degree of the airflow channel to be minimum SminWhile adjusting the speed of the fan to make the actual combustion load P2To achieve the required combustion load P1To date, Pmin＜P2≤Pmax；
Wherein, PnminWhen the opening of the airflow channel is maximum SmaxAnd the fan rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the corresponding first preset combustion load of the full premix gas water heater is obtained;
Pminwhen the opening of the airflow channel is minimum SminAnd the fan rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the minimum preset combustion load corresponding to the full premix gas water heater is set; pmin＜Pnmin；
PmaxWhen the opening of the airflow channel is maximum SmaxAnd the fan is at the maximum preset rotating speed NmaxAnd when the gas water heater rotates, the maximum preset combustion load corresponding to the fully premixed gas water heater.
The control method of the fully premixed gas water heater of the invention is further improved in that the control method further comprises the following steps:
if P2＞PnminWhen the opening degree of the airflow channel is positive delta P, the airflow throttling component is adjusted to enable the opening degree of the airflow channel to be maximum SmaxWhile adjusting the speed of the fan to make the actual combustion load P2To achieve the required combustion load P1To a is P ofnmin+△P＜P2≤Pmax；
Wherein Δ P is a load increment threshold value when the opening degree of the airflow channel needs to be changed.
The control method of the full-premix gas water heater is further improved in that the P of the full-premix gas water heater is calculated according to the water inlet temperature, the water outlet temperature and the water flow1。
Compared with the prior art, the invention adopting the scheme has the beneficial effects that:
according to the fully premixed gas water heater, the airflow throttling component is positioned on the airflow channel at the rear end of the fully premixed component and can adjust the opening degree in the airflow channel so as to adjust the positive pressure at the rear end of the fully premixed component, when the opening degree of the airflow channel is reduced, the positive pressure at the rear end of the fully premixed component is increased, the control unit controls the fan to maintain the rotating speed to be the minimum rotating speed unchanged, and the control unit controls the gas inlet quantity and the air inlet quantity of the fully premixed component to be reduced under the condition that the air-fuel ratio is unchanged, so that the minimum combustion load of the fully premixed gas water heater is reduced, and the problem that the minimum combustion load of the conventional fully premixed gas water heater is large is effectively solved.
The control method of the invention firstly judges whether the required combustion load is not less than P or not on the premise of the maximum opening of the airflow channelnmin(ii) a If yes, then proceed adjustmentA fan is used; if not, firstly adjusting the airflow throttling component to change the opening degree of the actual airflow channel from maximum to minimum, and then adjusting the fan, thereby effectively solving the problem that the minimum combustion load of the existing fully premixed gas water heater is larger.
Drawings
FIG. 1 is a schematic structural diagram of a fully premixed gas water heater according to embodiment 1 of the present invention; the arrows in the figure represent the gas flow direction;
FIG. 2 is a schematic structural diagram of an airflow throttling assembly of a fully premixed gas water heater in embodiment 1 of the invention;
fig. 3 is a flowchart of a control method of a fully premixed gas water heater according to embodiment 2 of the present invention.
In the figure: 1. a fully pre-mix assembly; 2. a fan; 3. a burner; 4. an airflow throttling assembly; 5. a control unit; 6. a smoke collecting hood; 7. a smoke exhaust pipe; 8. a heat exchange assembly; 9. a premix chamber; 11. an air-fuel ratio valve; 12. a venturi premixer; 41. an airflow valve; 42. a drive member; 81. a heat exchanger; 82. a cold water pipe; 83. a hot water pipe; 411. a rotating shaft; 412. a door body.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "axial," "radial," and the like are used in the positional or orientational relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The meaning of "plurality" is two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
As shown in fig. 1, the present embodiment 1 provides a fully premixed gas water heater, including a fully premixed assembly 1 for premixing gas and air to form fully premixed gas, a fan 2, a burner 3, an air flow throttling assembly 4, an air flow passage, and a control unit 5;
an air inlet of the fan 2 is connected with an air outlet end of the full-premixing component 1, and an air outlet of the fan 2 is connected with the combustor 3; the airflow throttling component 4 is positioned on an airflow channel at the rear end of the full premixing component 1 and is used for adjusting the opening of the airflow channel so as to realize the adjustment of the positive pressure at the rear end of the full premixing component 1;
the full premixing component 1, the fan 2 and the airflow throttling component 4 are all electrically connected with the control unit 5.
Because the air inlet of the fan 2 is connected with the air outlet end of the fully premixed component 1, and the air outlet of the fan 2 is connected with the combustor 3, the fully premixed gas flowing out of the fully premixed component 1 flows into the fan 2 from the air inlet of the fan 2, then flows to the combustor 3 from the air outlet of the fan 2, and is ignited and combusted by the combustor 3;
because the airflow throttling component 4 is positioned on the airflow channel at the rear end of the full premixing component 1 and can adjust the opening degree in the airflow channel to adjust the positive pressure at the rear end of the full premixing component 1, when the opening end of the airflow channel is reduced, the positive pressure at the rear end of the full premixing component 1 is increased, and under the condition that the control unit 5 controls the fan 2 to maintain the rotating speed unchanged, the control unit 5 controls the gas inlet amount and the air inlet amount of the full premixing component 1 to be reduced so as to ensure the stability of the air-fuel ratio, and the combustion load of the full premixing gas water heater is reduced accordingly; otherwise, the combustion load of the fully premixed gas water heater is increased.
For example when the fan 2 is at a minimum preset speed NminWhen the fan rotates, the control unit 5 controls the airflow throttling component 4 to adjust the opening degree of the airflow channel to be minimum, and at the moment, the control unit 5 controls the fan 2 to continue to rotate at the minimum preset rotating speed NminAnd the control unit 5 controls the gas inlet amount and the air inlet amount of the full premix assembly 1 to be further reduced because the positive pressure at the rear end of the full premix assembly 1 is increased, so that the minimum combustion load of the full premix gas water heater is further reduced, and the problem of larger minimum combustion load of the conventional full premix gas water heater is effectively solved.
Preferably, the control unit 5 may be a device such as a single chip microcomputer capable of receiving information and controlling the operation process of other components according to the received information.
Preferably, the fan 2 may be a direct current variable frequency fan.
Further, the fully premixed gas water heater also comprises a smoke collecting hood 6, a smoke exhaust pipe 7 and a heat exchange assembly 8;
the heat exchange assembly 8 is connected with the combustor 3, the smoke collecting cover 6 is connected with the heat exchange assembly 8, the smoke exhaust pipe 7 is installed at a smoke exhaust port of the smoke collecting cover 6, and the airflow throttling assembly 4 is installed in the smoke exhaust pipe 7 and used for adjusting the opening degree of the smoke exhaust pipe 7 so as to adjust the positive pressure at the rear end of the full-premixing assembly 1.
The smoke exhaust pipe 7 is used for guiding waste gas generated by ignition and combustion of the combustor 3 out of the full-premixing gas water heater, and the airflow throttling assembly 4 is arranged in the smoke exhaust pipe 7 and can effectively and comprehensively adjust the positive pressure at the rear end of the full-premixing assembly 1.
Further, the airflow throttling component 4 is arranged at one end of the smoke exhaust pipe 7 close to the smoke collecting hood 6, so as to timely adjust the positive pressure at the rear end of the full premixing component 1.
Further, as shown in fig. 1 and 2, the airflow throttling assembly 4 includes an airflow valve 41, a driving member 42 connected to the airflow valve 41; the airflow valve 41 is located in the airflow channel, and the driving member 42 is electrically connected to the control unit 5 for driving the airflow valve 41 to move so as to adjust the opening degree of the airflow channel.
Since the airflow valve 41 is located in the airflow channel, when the positive pressure at the rear end of the full premix assembly 1 needs to be adjusted, the control unit 5 controls the driving member 42 to be activated, and the driving member 42 drives the airflow valve 41 to move, so that the opening of the airflow channel changes.
Preferably, the air flow valve 41 is installed in the smoke exhaust pipe 7, and the driving member 42 drives the air flow valve 41 to move to change the opening degree of the smoke exhaust pipe 7, so that the positive pressure at the rear end of the full premix assembly 1 is changed.
For example, when the driving member 42 drives the airflow valve 41 to move so that the opening degree of the smoke exhaust pipe 7 is increased, the positive pressure at the rear end of the full premixing assembly 1 is reduced; when the driving member 42 drives the airflow valve 41 to move so that the opening degree of the smoke exhaust pipe 7 is reduced, the positive pressure at the rear end of the full premixing assembly 1 is increased.
Preferably, the driving member 42 drives the airflow valve 41 to move radially relative to the airflow channel to change the opening of the airflow channel;
preferably, the driving member 42 drives the airflow valve 41 to rotate relative to the airflow channel to change the opening of the airflow channel.
Preferably, the driving member 42 may be a motor.
Further, the driving member 42 is electrically connected to the control unit 5 for driving the airflow valve 41 to rotate so as to adjust the opening of the airflow channel.
Preferably, the driving member 42 is electrically connected to the control unit 5 for driving the airflow valve 41 to rotate so as to adjust the opening degree of the smoke exhaust pipe 7.
Further, the airflow valve 41 includes a rotating shaft 411, and a door 412 connected to the rotating shaft 411;
the rotating shaft 411 and the door body 412 are both arranged in the airflow channel in the radial direction; the driving member 42 is connected to the rotating shaft 411 for driving the door 412 to rotate so as to change the opening of the air flow channel.
Preferably, one end of the rotating shaft 411 is connected with the driving member 42, and the other end of the rotating shaft 411 radially extends into the air flow channel and is rotatably connected with the inner side wall of the air flow channel; the area of the largest cross section of the door body 412 is slightly smaller than the area of the radial cross section of the airflow channel, so that an airflow port can be formed between the door body 412 and the airflow channel when the largest cross section of the door body 412 is parallel to the radial cross section of the airflow channel.
For example, one end of the rotating shaft 411 is connected with the driving member 42 installed on the outer side wall of the smoke exhaust pipe 7, and the other end extends radially into the smoke exhaust pipe 7 and is rotatably connected with the inner side wall of the smoke exhaust pipe 7; at this time, the area of the largest cross section of the door body 412 is smaller than the area of the radial cross section of the smoke exhaust pipe 7, so even if the largest cross section of the door body 412 is parallel to the radial cross section of the smoke exhaust pipe 7, an airflow opening through which the exhaust gas flows out is also left between the door body 412 and the inner side wall of the smoke exhaust pipe 7, and the opening degree of the smoke exhaust pipe 7 is also the smallest at this time.
When the maximum cross section of the door body 412 is perpendicular to the radial cross section of the smoke exhaust pipe 7, the opening degree of the smoke exhaust pipe 7 is maximum.
Further, the full premixing assembly 1 comprises an air-fuel ratio valve 11 and a venturi premixer 12 for injecting air; the air-fuel proportional valve 11 is installed on a gas pipe and communicated with the venturi pre-mixer 12, the venturi pre-mixer 12 is further communicated with an air inlet of the fan 2, and the air-fuel proportional valve 11 is electrically connected with the control unit 5.
The control unit 5 controls the valve opening of the air-fuel proportional valve 11 to change by controlling the rotation speed of the fan 2, so as to ensure that the air-fuel ratio meets the requirement.
The gas enters the venturi pre-mixer 12 through the air-fuel proportional valve 11, and the gas and the air entering the venturi pre-mixer 12 are completely mixed to obtain fully pre-mixed gas; the fully premixed gas enters the fan 2 from the air inlet of the fan 2, flows out from the air outlet of the fan 2 and is ignited and combusted by the combustor 3.
Further, the heat exchange assembly 8 comprises a heat exchanger 81, a cold water pipe 82 and a hot water pipe 83; the cold water pipe 82 is communicated with a cold water inlet of the heat exchanger 81, and the hot water pipe 83 is communicated with a hot water outlet pipe of the heat exchanger 81.
Furthermore, the fully premixed gas water heater also comprises an outlet water temperature detection unit, an inlet water temperature detection unit and a water flow detection unit which are electrically connected with the control unit 5; the outlet water temperature detecting unit is installed on the hot water pipe 83, the inlet water temperature detecting unit is installed on the cold water pipe 82, and the water flow detecting unit is installed on the water flow passage.
Preferably, a water flow rate detecting unit is installed on the cold water pipe 82 for detecting the inflow water flow rate.
The outlet water temperature detection unit feeds the detected actual outlet water temperature back to the control unit 5, the inlet water temperature detection unit feeds the detected inlet water temperature back to the control unit 5, and the water flow detection unit feeds the detected water flow back to the control unit 5;
the control unit 5 calculates the required combustion load P of the fully premixed gas water heater according to the received information and by combining an internal algorithm1(ii) a The control unit 5 also determines the required combustion load P1Whether or not less than Pnmin；
If yes, the control unit 5 controls the driving member 42 to maintain the stopped state, i.e. to maintain the opening degree of the airflow channel to be maximum, and controls the fan 2 to adjust the rotating speed so as to enable the actual combustion load P to be in the maximum2To achieve the required combustion load P1Until the end;
if not, the control unit 5 controls the driving part 42 to start to drive the rotating shaft 411 to rotate and drive the door body 412 to rotate, so that the opening degree of the airflow channel is minimized and the opening degree of the airflow channel is maintained in a minimum state; at the same time, the control unit 5 controls the fan 2 to adjust the rotating speed so as to ensure that the actual combustion load P2To achieve the required combustion load P1Until now.
Further, the fully premixed gas water heater further comprises a premixing cavity 9, and the premixing cavity 9 is located between the fan 2 and the combustor 3; the fully premixed gas flowing out of the air outlet of the fan 2 enters the premixing cavity 9 for further mixing, and the premixing cavity 9 also has the function of storing the fully premixed gas.
The working process is as follows:
when the fan 2 rotates at the minimum preset speed NminDuring rotation, the outlet water temperature detection unit detects that the outlet water temperature of the hot water pipe 83 is still higher than the preset temperature of a user, at this time, the control unit 5 controls the driving part 42 (such as a motor) to start, the driving part 42 drives the rotating shaft 411 to rotate, and further drives the door body 412 to rotate, so that the smoke exhaust pipe 7 is changed from the maximum opening degree to the minimum opening degree and is maintained at the minimum opening degree; at this time, if the rotation speed of the fan 2 is still unchanged, because the positive pressure at the rear ends of the venturi premixer 12 and the air-fuel ratio valve 11 is increased and the corresponding negative pressure is reduced, the amount of the injected air of the venturi premixer 12 is reduced, and meanwhile, in order to ensure the stability of the air-fuel ratio, the control unit 5 controls the air-fuel ratio valve 11 to correspondingly reduce the gas inlet amount, so that the minimum combustion load of the fully premixed gas water heater is further reduced, and further, the range of the load regulation ratio of the fully premixed gas water heater of the embodiment is larger than that of the fully premixed gas water heater without the air flow throttling assembly 4, thereby effectively solving the problem that the minimum combustion load of the conventional fully premixed gas water heater is larger.
Example 2
As shown in fig. 3, the present embodiment provides a control method of a fully premixed gas water heater, which includes the following steps:
starting the fully premixed gas water heater and calculating the required combustion load P of the fully premixed gas water heater1；
If the required combustion load P1Satisfies the following conditions: p1≥PnminMaintaining the maximum opening S of the airflow passagemaxWhile adjusting the rotational speed of the fan 2 to make the actual combustion load P2To achieve the required combustion load P1To a is P ofnmin＜P2≤Pmax；
If the required combustion load P1Satisfies the following conditions: p1＜PnminThen the airflow throttling component 4 is adjusted to make the opening degree of the airflow channel minimum SminSimultaneously adjustThe rotation speed of the whole fan 2 enables the actual combustion load P2To achieve the required combustion load P1To a is P ofmin＜P2≤Pmax；
Wherein, PnminWhen the opening of the airflow channel is maximum SmaxAnd the fan 2 rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the corresponding first preset combustion load of the full premix gas water heater is obtained;
Pminwhen the opening of the airflow channel is minimum SminAnd the fan 2 rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the minimum preset combustion load corresponding to the full premix gas water heater is set; pmin＜Pnmin；
PmaxWhen the opening of the airflow channel is maximum SmaxAnd the fan 2 rotates at the maximum preset rotating speed NmaxAnd when the gas water heater rotates, the maximum preset combustion load corresponding to the fully premixed gas water heater.
Because of PnminWhen the opening of the airflow channel is maximum SmaxAnd the fan 2 rotates at the minimum preset rotating speed NminWhen rotating, the first preset combustion load corresponding to the fully premixed gas water heater, and in the embodiment, the maximum S of the opening degree of the air flow channelmaxOn the premise of firstly setting the required combustion load P1And PnminBy comparison, if P1≥PnminIt means that the actual combustion load P can be adjusted by adjusting the rotation speed of the fan 22To achieve the required combustion load P1(ii) a And if P1＜PnminIt means that the actual combustion load P cannot be adjusted by merely adjusting the rotational speed of the fan 22To achieve the required combustion load P1I.e. even if the gas water heater is fully premixed with PnminRunning, and still making the temperature of the outlet water higher than the preset temperature; therefore, it is necessary to adjust the airflow throttling component 4 to reduce the opening of the airflow channel until the opening is minimum SminThen the rotation speed of the fan 2 is adjusted to make the actual combustion load P2To achieve the required combustion load P1。
The minimum opening S of the airflow channel under the condition that the rotating speed of the fan 2 is not changedminTime full premix combustionThe actual combustion load of the gas water heater is less than the maximum S of the opening degree of the airflow channelmaxActual combustion load of the fully premixed gas water heater.
Wherein the first predetermined combustion load PnminMaximum predetermined combustion load PmaxMinimum preset rotation speed NminMaximum predetermined rotational speed NmaxMinimum preset combustion load PminThe values can be preset in the control system of the fully premixed gas water heater in advance, or can be any values preset by engineers according to actual conditions.
But when the opening of the air flow passage is maximum SmaxIn time, if the fan 2 rotates at the maximum preset speed NmaxRotating, the actual combustion load P of the fully premixed gas water heater at the moment2Reach the maximum preset combustion load Pmax(ii) a If the fan 2 rotates at the minimum preset speed NminRotating, the actual combustion load P of the fully premixed gas water heater at the moment2Reaches a first preset combustion load Pnmin。
When the opening of the air flow passage is minimum SminIn the meantime, if the fan 2 is still at the maximum preset rotation speed NmaxRotating, the actual combustion load P of the fully premixed gas water heater at the moment2Reaches a second preset combustion load Pnmax(ii) a If the fan 2 is still at the minimum preset rotation speed NminRotating, the actual combustion load P of the fully premixed gas water heater at the moment2To a minimum preset combustion load Pmin。
Thus, Pmin、Pnmin、Pnmax、PmaxMay be Pmin＜Pnmin＜Pnmax＜Pmax。
The corresponding relation among the opening S of the airflow channel, the rotating speed of the fan 2 and the combustion load of the fully premixed gas water heater is shown in the table 1.
TABLE 1 correspondence of opening S of air flow channel, fan speed, and combustion load of fully premixed gas water heater
Further, in order to avoid the problem that the opening degree of the airflow throttling assembly 4 is switched back and forth between the maximum and the minimum, the control method of the embodiment further includes:
if the actual combustion load P2Satisfies the following conditions: p2＞PnminWhen the opening degree of the airflow passage is positive delta P, the airflow throttling component 4 is adjusted to enable the opening degree of the airflow passage to be maximum SmaxWhile adjusting the rotational speed of the fan 2 to make the actual combustion load P2To achieve the required combustion load P1To a is P ofnmin+△P＜P2≤Pmax；
Where Δ P is a load increment threshold value when the opening degree of the airflow passage needs to be changed.
Further, the embodiment calculates the combustion load P required by the gas water heater according to the inlet water temperature, the outlet water temperature and the water flow1(ii) a This calculation is calculated from the internal algorithm of the fully premixed gas water heater.
The working process of this embodiment is specifically described with reference to embodiment 1:
starting the fully premixed gas water heater and setting the outlet water temperature TPreset of(ii) a A hot water faucet is turned on, the burner 3 is ignited to burn to heat the heat exchanger 81, cold water enters the heat exchanger 81 from the cold water pipe 82, and hot water obtained through heat exchange flows out from the hot water pipe 83; meanwhile, a water flow rate detection unit (e.g., a water flow rate sensor) detects the water flow rate V in the cold water pipe 82 in real time; the outlet water temperature detecting unit (for example, outlet water temperature sensor) detects the actual outlet water temperature T of the hot water pipe 83 in real timeGo out(ii) a The inlet water temperature detecting unit (such as inlet water temperature sensor) detects the inlet water temperature T of the cold water pipe 82 in real timeInto；
The control unit 5 receives the outlet water temperature TGo outTemperature T of inlet waterIntoThe water flow V is mixed and is according to the outlet water temperature TGo outTemperature T of inlet waterIntoCalculating the required combustion load P of the fully premixed gas water heater by combining with the water flow V and an internal algorithm1；
Control unit 5 judges full premix gas heaterRequired combustion load P1Whether or not less than Pnmin；
If yes, the control unit 5 controls the driving member 42 (e.g. motor) to maintain the closed state, i.e. maintain the opening degree of the smoke discharging pipe 7 at the maximum opening degree SmaxIn a state where the control unit 5 controls the fan 2 to adjust the rotation speed so that the actual combustion load P is applied2To achieve the required combustion load P1To a is P ofnmin＜P2≤Pmax；
If not, the control unit 5 controls the driving part 42 to start, the driving part 42 drives the rotating shaft 411 to rotate so as to drive the door body 412 to rotate, and then the opening degree of the smoke exhaust pipe 7 is enabled to be the maximum opening degree SmaxState transition to minimum opening degree SminIs in a state of being maintained at the minimum opening SminThe control unit 5 also controls the fan 2 to adjust the rotation speed to make the actual combustion load P2To achieve the required combustion load P1To a is P ofmin＜P2≤Pmax；
In the control method of the present embodiment, if the actual combustion load P occurs2Satisfies the following conditions: p2＞PnminWhen the opening degree of the smoke exhaust pipe 7 is positive delta P, the airflow throttling component 4 is adjusted to restore the opening degree of the smoke exhaust pipe 7 to the maximum opening degree SmaxState, while adjusting the speed of the fan 2 to make the actual combustion load P2To achieve the required combustion load P1To a is P ofnmin+△P＜P2≤Pmax；
When the fully premixed gas water heater is closed, the airflow channel is restored to the maximum opening SmaxStatus.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the described parent features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (12)
1. A control method of a fully premixed gas water heater is characterized by comprising the following steps:
starting the fully premixed gas water heater, and calculating the required combustion load P of the fully premixed gas water heater according to the inlet water temperature, the outlet water temperature and the water flow1；
If P1≥PnminThen the maximum opening S of the airflow channel in the smoke exhaust pipe (7) is maintained through the airflow shunting assembly (4)maxAnd simultaneously adjusting the rotating speed of the fan (2) to ensure that the actual combustion load P is2To achieve the required combustion load P1To date, Pnmin＜P2≤Pmax；
If P1＜PnminAdjusting the airflow throttling component (4) to convert the opening degree of the airflow channel in the smoke exhaust pipe (7) into the minimum SminAnd simultaneously adjusting the rotating speed of the fan (2) to ensure that the actual combustion load P is2To achieve the required combustion load P1To date, Pmin＜P2≤Pmax；
Wherein, PnminWhen the opening of the airflow channel in the smoke exhaust pipe (7) is maximum SmaxAnd the fan (2) rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the corresponding first preset combustion load of the full premix gas water heater is obtained;
Pminwhen the opening of the airflow channel in the smoke exhaust pipe (7) is minimum SminAnd the fan (2) rotates at the minimum preset rotating speed NminWhen the gas water heater rotates, the minimum preset combustion load corresponding to the full premix gas water heater is set;
Pmaxwhen the opening of the airflow channel in the smoke exhaust pipe (7) is maximum SmaxAnd a fan (2) andmaximum predetermined rotational speed NmaxWhen the gas water heater rotates, the maximum preset combustion load corresponding to the full-premix gas water heater is set; wherein, Pmin＜Pnmin＜Pnmax＜Pmax；
PnmaxWhen the opening of the airflow channel in the smoke exhaust pipe (7) is minimum SminAnd the fan (2) rotates at the maximum preset rotating speed NmaxAnd when the gas water heater rotates, the second preset combustion load corresponding to the fully premixed gas water heater.
2. The control method of a fully premixed gas water heater as claimed in claim 1, further comprising:
if P2＞PnminWhen the opening degree of the airflow throttling component (4) is positive delta P, the opening degree of the airflow channel in the smoke exhaust pipe (7) is adjusted to be the maximum SmaxAnd simultaneously adjusting the rotating speed of the fan (2) to ensure that the actual combustion load P is2To achieve the required combustion load P1To a is P ofnmin+△P＜P2≤Pmax；
Wherein Δ P is a load increment threshold value when the opening degree of the airflow channel needs to be changed.
3. A fully premixed gas water heater applying the control method of the fully premixed gas water heater according to claim 1 or 2, characterized by comprising a fully premixed assembly (1) for premixing gas and air to form fully premixed gas, a fan (2), a burner (3), an air flow throttling assembly (4), and a control unit (5);
an air inlet of the fan (2) is connected with an air outlet end of the full premixing component (1), and an air outlet of the fan (2) is connected with the combustor (3); the airflow throttling component (4) is positioned on an airflow channel at the rear end of the full premixing component (1) and is used for adjusting the opening of the airflow channel so as to realize the adjustment of the positive pressure at the rear end of the full premixing component (1);
the full-premixing component (1), the fan (2) and the airflow throttling component (4) are electrically connected with the control unit (5).
4. A fully premixed gas water heater according to claim 3, characterized in that it further comprises a fume collecting hood (6), a fume exhaust pipe (7), and a heat exchange assembly (8);
heat exchange assembly (8) with combustor (3) are connected, collection petticoat pipe (6) with heat exchange assembly (8) are connected, it installs to discharge fume pipe (7) the smoke vent department of collection petticoat pipe (6), install airflow throttling assembly (4) be used for the adjustment in discharging fume pipe (7) discharge fume the aperture of pipe (7) in order to realize the adjustment the normal pressure of full premix subassembly (1) rear end.
5. A fully premixed gas water heater according to claim 4, characterized in that the air flow throttling assembly (4) is installed at one end of the smoke exhaust pipe (7) close to the fume collecting hood (6).
6. The fully premixed gas water heater according to any of claims 3 to 5, wherein the air flow throttling assembly (4) comprises an air flow valve (41), a driving member (42) connected to the air flow valve (41); the airflow valve (41) is located in the airflow channel, and the driving part (42) is electrically connected with the control unit (5) and used for driving the airflow valve (41) to move so as to adjust the opening degree of the airflow channel.
7. The fully premixed gas water heater according to claim 6, wherein the driving member (42) is electrically connected to the control unit (5) for driving the air flow valve (41) to rotate to adjust the opening of the air flow passage.
8. The fully premixed gas water heater according to claim 7, wherein the air flow valve (41) comprises a rotating shaft (411), and a door body (412) connected with the rotating shaft (411);
the rotating shaft (411) and the door body (412) are both arranged in the airflow channel in the radial direction; the driving piece (42) is connected with the rotating shaft (411) and used for driving the door body (412) to rotate so as to change the opening degree of the airflow channel.
9. Fully premixed gas water heater according to any of the claims 3 to 5, characterized by the fact that the fully premixed assembly (1) comprises an air-fuel proportional valve (11), and a venturi premixer (12) for injecting air;
the air-fuel proportional valve (11) is arranged on a gas pipe and is communicated with a gas inlet of the Venturi premixer (12), and the gas outlet end of the Venturi premixer (12) is communicated with an air inlet of the fan (2); the air-fuel ratio valve (11) is electrically connected with the control unit (5).
10. Fully premixed gas water heater according to claim 4, characterized in that said heat exchange assembly (8) comprises a heat exchanger (81), a cold water pipe (82) and a hot water pipe (83); the cold water pipe (82) is communicated with a cold water inlet of the heat exchanger (81), and the hot water pipe (83) is communicated with a hot water outlet pipe of the heat exchanger (81).
11. The fully premixed gas water heater according to claim 10, further comprising an outlet water temperature detecting unit, an inlet water temperature detecting unit, and a water flow rate detecting unit all electrically connected to the control unit (5); the outlet water temperature detection unit is arranged on the hot water pipe (83), the inlet water temperature detection unit is arranged on the cold water pipe (82), and the water flow detection unit is arranged on a water flow channel.
12. Fully premixed gas water heater according to any of the claims 3 to 5, characterized by the fact that said fan (2) is a direct current variable frequency fan.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206094581U (en) * | 2016-09-05 | 2017-04-12 | 罗欣奎 | General mood link gear of gas heater or hanging stove |
| CN208170751U (en) * | 2018-03-20 | 2018-11-30 | 宁波方太厨具有限公司 | A kind of gas heater |
| EP3460330A1 (en) * | 2017-09-25 | 2019-03-27 | Robert Bosch GmbH | Mixing device for heating devices and heating devices with such a mixing device |
| CN110220244A (en) * | 2019-05-14 | 2019-09-10 | 深圳市合信达控制***有限公司 | A kind of method, system and burnt gas wall hanging furnace improving efficiency of combustion |
| CN110260524A (en) * | 2019-06-03 | 2019-09-20 | 华帝股份有限公司 | Fully-premixed gas water heater and control method thereof |
| CN210141695U (en) * | 2019-04-25 | 2020-03-13 | 华帝股份有限公司 | Gas water heater with gas-saving function |
| CN210320689U (en) * | 2019-04-30 | 2020-04-14 | 华帝股份有限公司 | Gas water heater |
-
2020
- 2020-07-22 CN CN202010712335.1A patent/CN111947317B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206094581U (en) * | 2016-09-05 | 2017-04-12 | 罗欣奎 | General mood link gear of gas heater or hanging stove |
| EP3460330A1 (en) * | 2017-09-25 | 2019-03-27 | Robert Bosch GmbH | Mixing device for heating devices and heating devices with such a mixing device |
| CN208170751U (en) * | 2018-03-20 | 2018-11-30 | 宁波方太厨具有限公司 | A kind of gas heater |
| CN210141695U (en) * | 2019-04-25 | 2020-03-13 | 华帝股份有限公司 | Gas water heater with gas-saving function |
| CN210320689U (en) * | 2019-04-30 | 2020-04-14 | 华帝股份有限公司 | Gas water heater |
| CN110220244A (en) * | 2019-05-14 | 2019-09-10 | 深圳市合信达控制***有限公司 | A kind of method, system and burnt gas wall hanging furnace improving efficiency of combustion |
| CN110260524A (en) * | 2019-06-03 | 2019-09-20 | 华帝股份有限公司 | Fully-premixed gas water heater and control method thereof |
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