CN114370702A - Gas water heater control method and gas water heater - Google Patents
Gas water heater control method and gas water heater Download PDFInfo
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- CN114370702A CN114370702A CN202111476020.2A CN202111476020A CN114370702A CN 114370702 A CN114370702 A CN 114370702A CN 202111476020 A CN202111476020 A CN 202111476020A CN 114370702 A CN114370702 A CN 114370702A
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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
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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
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1836—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
The invention relates to a gas water heater control method and a gas water heater, wherein the gas water heater control method comprises the following steps: heating the main path water flow; adjusting the minimum caliber of the bypass flow channel according to the inflow rate; adjusting the heating energy of the main path water flow according to the change of the inflow water flow or the flow of the main path water flow; and when the descending amplitude of the water inlet flow in the preset time is larger than the descending threshold value, opening the bypass flow channel, so that part of water flows through the bypass flow channel to bypass the heat exchanger and then is mixed with the main path water flow. Under the condition that the flow of water flow introduced into the gas water heater, namely the inflow water flow is stable and normal, the bypass flow channel is in a cut-off state, so that the water flow flowing into the gas water heater forms a main path water flow and absorbs heat through the heat exchanger. Because the water flow passing through the bypass pipe is not heated, the temperature of the output water flow can be reduced after mixing, and the phenomenon that a user feels uncomfortable or is scalded by hot water due to overhigh water temperature of the water discharged from the gas water heater is avoided.
Description
Technical Field
The invention relates to the technical field of gas appliances, in particular to a gas water heater control method and a gas water heater.
Background
The gas water heater is also called as a gas water heater, and refers to a gas appliance which takes gas as fuel and transfers heat to cold water flowing through a heat exchanger in a combustion heating mode to prepare hot water.
The gas water heater with partial large flow is applied to the environment with a plurality of water consumption points, such as a large flat layer or a villa, and the like, and the hot water is uniformly supplied to the plurality of water consumption points of the whole house, and the water consumption points can be a toilet or a kitchen, and the like. The frequency of water consumption at a plurality of water consumption points is greatly improved.
However, when the gas water heater is used, after two water consumption points consume water at the same time, one water consumption point is suddenly closed, and the water quantity passing through the gas water heater is rapidly reduced in a short time, so that the temperature of the discharged water of the gas water heater is increased. When the temperature of the water stored in the gas water heater is too high, the user may feel uncomfortable, and even the user may be scalded by the hot water.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a gas water heater and a control method thereof, which can effectively reduce the rising range of the outlet water temperature when the partial water consumption point is closed, and avoid the discomfort of the user caused by the overhigh water temperature.
The first technical problem is solved by the following technical scheme:
a gas water heater control method comprising:
heating the main path water flow;
adjusting the minimum caliber of the bypass flow channel according to the inflow rate;
adjusting heating energy of the main path water flow according to the change of the water inlet flow or the flow of the main path water flow;
and when the descending amplitude of the water inlet flow in the preset time is larger than a descending threshold value, the bypass flow channel is opened, so that part of water flows through the bypass flow channel to bypass the heat exchanger and then is mixed with the main path water flow.
Compared with the background technology, the control method of the gas water heater has the following beneficial effects: under the condition that the flow of water flow introduced into the gas water heater, namely the inflow water flow is stable and normal, the bypass flow channel is in a cut-off state, so that the water flow flowing into the gas water heater forms a main path water flow and absorbs heat through the heat exchanger. And then, the water flow after heat exchange and temperature rise flows out of the gas water heater. When the descending amplitude of the flow of the water flowing into the gas water heater in a preset time is larger than a descending threshold value, the bypass flow channel is opened, one part of the water flowing into the gas water heater from the outside is used as main path water flow to pass through the heat exchanger and absorb heat to be heated, the other part of the water flows through the bypass flow channel to bypass the heat exchanger, and the water flow after heat exchange and temperature rise is mixed with the water flow passing through the bypass flow channel and then is output to a water consumption point. Because the water flow passing through the bypass pipe is not heated, the temperature of the output water flow can be reduced after mixing, and the phenomenon that a user feels uncomfortable or is scalded by hot water due to overhigh water temperature of the water discharged from the gas water heater is avoided. The minimum caliber of the bypass flow channel is adjusted in opening according to the water inlet flow before the bypass flow channel is opened, so that the flow passing through the bypass flow channel can be immediately adjusted according to the corresponding minimum caliber after the bypass flow channel is opened, the adjustment adaptive time of the minimum caliber of the bypass flow channel after the bypass flow channel is opened is shortened, the flow change of the bypass flow channel caused by the adjustment of the minimum caliber of the bypass flow channel of the proportional valve is avoided, and the temperature of water flow output from the gas water heater is prevented from being greatly fluctuated.
In one embodiment, in adjusting the minimum aperture of the bypass flow passage according to the intake water flow rate variation, the minimum aperture of the bypass flow passage is adjusted in real time according to the intake water flow rate variation when the bypass flow passage is in a cut-off state. Therefore, after the bypass flow channel is opened, the flow passing through the bypass flow channel can adapt to the inflow, and the situation that the minimum caliber of the bypass flow channel needs to be adjusted to a large extent after the bypass flow channel is opened is avoided.
In one embodiment, the method further comprises the following steps: and when the outlet water temperature is lower than a first temperature threshold value, the stop of the bypass flow passage is recovered. Thereby preparing for the next influent water flow reduction treatment.
In one embodiment, in recovering the cutoff of the bypass flow passage, the bypass flow passage in the open state is cut off after the minimum diameter of the bypass flow passage is reduced. Therefore, the water yield of the gas water heater is prevented from suddenly dropping due to the sudden stop of the bypass flow channel.
In one embodiment, after the bypass flow channel is opened, the minimum aperture of the bypass flow channel is adjusted according to the outlet water temperature. Thereby improving the accuracy of the temperature of the output water flow.
In one embodiment, in the step of opening the bypass flow channel, the bypass flow channel is opened after the minimum aperture of the bypass flow channel is adjusted to a primary adjustment value, and the minimum aperture of the bypass flow channel is adjusted to a secondary adjustment value according to the inflow water after the bypass flow channel is opened. Therefore, the adjustment accuracy of the minimum aperture of the bypass flow channel can be improved, and the waiting time before the bypass flow channel is opened can be reduced.
In one embodiment, the minimum aperture of the bypass flow passage is adjusted according to the change of the inlet water flow, and the inlet water flow is the flow of the water passing through the inlet of the inlet pipe.
In one embodiment, the method further comprises the following steps: and when the gas water heater is started, if the shutdown interval is shorter than the shutdown threshold value, the bypass flow channel is opened. Thereby reducing the outlet water temperature when the gas water heater is restarted in a short time.
In one embodiment, when the gas water heater is started, if the shutdown interval is shorter than the shutdown threshold, the minimum caliber of the bypass flow passage is adjusted to a preset value. Thereby enabling the flow rate of the normal temperature water mixed with the residual water every time to be consistent.
A gas water heater is used for implementing a gas water heater control method.
Drawings
FIG. 1 is a schematic structural diagram of a gas water heater according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating a method for controlling a gas water heater according to an embodiment of the present invention;
fig. 3 is a flow chart of a gas water heater control method according to another embodiment of the invention.
Reference numerals:
100. a gas water heater; 20. a water inlet pipe; 21. a second temperature detection member; 30. a water outlet pipe; 31. a first temperature detection member; 32. a third temperature detection member; 40. a heat exchanger; 50. a first flow rate detecting member; 60. a bypass pipe; 61. a proportional valve; 62. an on-off valve; 63. a second flow rate detecting member; 70. a controller; 80. a burner; 90. a casing.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
The technical scheme provided by the embodiment of the invention is described below by combining the accompanying drawings.
Referring to FIG. 1, the present invention provides a gas water heater 100.
Specifically, the gas water heater 100 exchanges heat of heat released by gas combustion into water flow, and the water flow is output from the gas water heater 100 to each water consumption point after being heated.
In some embodiments, as shown in connection with FIG. 1, a gas water heater 100 includes: the water heater comprises a water inlet pipe 20, a water outlet pipe 30, a heat exchanger 40 connected between the water inlet pipe 20 and the water outlet pipe 30, a first flow detection piece 50 arranged on the water inlet pipe 20, and a bypass pipe 60 connected between the water inlet pipe 20 and the water outlet pipe 30. The heat exchanger 40 is used for exchanging heat for the main path water flow. The first flow sensing member 50 is used to sense the inflow of the water from the inlet pipe 20. The bypass pipe 60 is provided with a proportional valve 61 and an on-off valve 62, and the opening degree of the proportional valve 61 is adjusted according to the inflow rate. The on-off valve 62 can be in an on state or an off state. The on-off valve 62 is switched from the off state to the on state in accordance with a change in the inflow rate of the intake water.
In the case that the flow of the water flowing into the water inlet pipe 20 is steady and normal, the on-off valve 62 is in an off state, and the water flow is limited to pass through the bypass pipe 60, so that the water flow flowing into the water inlet pipe 20 forms a main water flow and absorbs heat through the heat exchanger 40. Then, the water after heat exchange and temperature rise flows out of the gas water heater 100 through the water outlet pipe 30. When the falling amplitude of the flow of the water flowing into the water inlet pipe 20 in a preset time is larger than the falling threshold value, the switch valve 62 is switched from the off state to the on state, a part of the water flowing into the water inlet pipe 20 from the outside passes through the heat exchanger 40 as a main path water flow and absorbs heat to raise the temperature, the other part of the water directly flows to the water outlet pipe 30 through the bypass pipe 60, and the water after heat exchange and temperature rise and the water passing through the bypass pipe 60 are mixed in the water outlet pipe 30 and then output to a water using point from the outlet of the water outlet pipe 30. Since the water flow passing through the bypass pipe 60 is not heated, the temperature of the water flow outputted from the outlet of the water outlet pipe 30 can be lowered after mixing, and the problem that the temperature of the water discharged from the gas water heater 100 is too high and causes discomfort or scalding of the user by the hot water can be avoided. Since the opening degree of the proportional valve 61 is adjusted according to the inflow water flow rate when the on-off valve 62 is in the closed state, the flow rate passing through the bypass pipe 60 can be adjusted by the corresponding opening degree immediately after the on-off valve 62 is switched to the open state, so that the adjustment adaptation time of the proportional valve 61 after the on-off valve 62 is switched to the open state is reduced, the flow rate change of the bypass pipe 60 caused by the change of the opening degree of the proportional valve 61 is avoided, and the temperature of the water flow output from the water outlet pipe 30 is prevented from being greatly fluctuated.
Specifically, the main path water flow is the water flow from the inlet pipe 20 to the outlet pipe 30 through the heat exchanger 40. The opening of the proportional valve 61 may be arbitrarily changed between 0% and 100%, where at 0% opening, the proportional valve 61 is in a fully closed state, and at 100% opening, the proportional valve 61 is in a fully open state. The inflow rate is the rate of water flow injected from the fluid supply source to the inlet of the inlet pipe 20. In some embodiments, the fluid supply is a municipal water supply line.
Further, as shown in fig. 1, the gas water heater 100 further includes a housing 90, and the heat exchanger 40 and the controller 70 are connected to the housing 90. Specifically, the heat exchanger 40, the controller 70, the water inlet pipe 20, the water outlet pipe 30, and the bypass pipe 60 are at least partially accommodated in the cabinet 90.
In some embodiments, as shown in connection with FIG. 1, the gas water heater 100 further includes a burner 80 connected to the heat exchanger 40. An airflow valve is connected to the burner 80, and the airflow valve is used to adjust the flow rate of the gas entering the burner 80 by changing the opening degree. Specifically, the flow rate of the gas is changed by the gas flow valve, so that the heating power of the burner 80 can be adjusted according to the actual situation.
In one embodiment, the gas water heater 100 has a hot water production rate of 16 liters, and the main heat exchange occurs in a straight pipe of the heat exchanger 40, and hot water is directly discharged from the straight pipe to the water outlet pipe 30 after the heat exchange is completed. Specifically, the inner diameters of the water outlet pipe 30 and the straight pipe are 13mm, the length of the water outlet pipe 30 is 400mm, and the inner volume of the water outlet pipe 30 is as follows: 3.14 × 6.5 × 400/1000 ═ 53 ml. The length of each straight pipe is 200mm, and the volume in 5 straight pipes is: 6.5 × 3.14 × 200 × 5/1000 ═ 132.7 ml. If the water yield is reduced to 8 liters/min from 16 liters/min, namely from 267ml/s to 133ml/s, the monitoring period of the first flow detection element 50 is 0.1s, when the water yield is detected to be changed, 0.1s is existed, the water with the temperature exceeding the set temperature flows to the water outlet pipe 30 from the straight pipe of the heat exchanger 40, the emptying time of the water outlet pipe 30 is 53/133-0.4 s, and then 0.3s is passed, the water with the temperature exceeding the set temperature is already drained out of the water heater body, the adjusting period of the proportional valve 61 is 4 s-5 s, and the proportional valve 61 alone cannot keep up with the change of the water flow.
The flow of the bypass pipe 60 is closed by the switch valve 62 when the water heater is in normal use, and the proportional valve 61 is automatically adjusted along with the detected inlet water flow of the first flow detection part 50, the pre-adjustment is based on the bypass water flow required by half of the water flow, and when the water flow change rate is reduced to 0.6Qmax below the national standard, the adjustment mode of the prior art is adopted. When the water flow rate is higher than the national standard 0.8Qmax and is reduced to the reference value of 0.6Qmax, the opening of the proportional valve 61 is finely adjusted for 0.2s according to the detected water flow change, the switch valve 62 is opened to neutralize the high-temperature water and reduce the temperature rise caused by the water temperature overshoot.
In some embodiments, the controller 70 is electrically connected to the first flow sensing member 50 to receive a feedback signal related to the flow of the influent water. The controller 70 is also electrically connected to the proportional valve 61 and the on-off valve 62 to output a control signal for adjusting the opening degree of the proportional valve 61 or the state of the on-off valve 62.
In some embodiments, as shown in connection with fig. 1, the gas water heater 100 further includes a second temperature detecting member 21 disposed at an inlet of the water inlet pipe 20. The second temperature detection member 21 is electrically connected to the controller 70. The temperature of the water flowing in from the inlet of the water inlet pipe 20 can be detected by the second temperature detecting member 21, and further, the controller 70 can change the opening degree of the air flow valve according to the temperature of the water flowing in from the inlet of the water inlet pipe 20, and the fire power of the burner 80 can correspond to the temperature of the water flowing into the gas water heater 100, so that the temperature of the water after heat exchange can be more accurately controlled.
In some embodiments, as shown in fig. 1, the gas water heater 100 further includes a first temperature detecting element 31 disposed on the water outlet pipe 30, and a distance between the first temperature detecting element 31 and an inlet of the water outlet pipe 30 is smaller than a distance between the first temperature detecting element 31 and an outlet of the water outlet pipe 30. The first temperature detection member 31 is electrically connected to the controller 70. Specifically, the first temperature detector 31 is used to detect the temperature of the water flow in the water pipe 30. Further, the distance between the first temperature detection element 31 and the inlet of the water outlet pipe 30 is the length of the water outlet pipe 30 between the first temperature detection element 31 and the inlet of the water outlet pipe 30, and the distance between the first temperature detection element 31 and the outlet of the water outlet pipe 30 is the length of the water outlet pipe 30 between the first temperature detection element 31 and the outlet of the water outlet pipe 30, so that the first temperature detection element 31 can detect the temperature of the water flow which just completes heat exchange and feed back temperature detection information to the controller 70, and the heat exchange effect of the heat exchanger 40 on the water flow can be reflected accurately. More specifically, the first temperature sensing member 31 is disposed near the inlet of the water outlet pipe 30. The first temperature detection member 31 may be a temperature sensor.
In some embodiments, as shown in connection with FIG. 1, the first flow sensing member 50 is disposed between the inlet of the bypass pipe 60 and the outlet of the inlet pipe 20. Specifically, the inlet of the bypass pipe 60 communicates with the inlet pipe 20, and the communication between the bypass pipe 60 and the inlet pipe 20 is located between the inlet of the inlet pipe 20 and the outlet of the inlet pipe 20, so that the detection value of the first flow rate detection member 50 can directly reflect the flow rate passing through the heat exchanger 40, and the controller 70 can adjust the opening degree of the air flow valve directly according to the detection value of the first flow rate detection member 50.
In some embodiments, as shown in connection with fig. 1, the gas water heater 100 further includes a third temperature sensing member 32, the third temperature sensing member 32 being disposed between the outlet of the bypass pipe 60 and the outlet of the outlet pipe 30. The third temperature detection member 32 is electrically connected to the controller 70. Specifically, the outlet of the bypass pipe 60 is communicated with the water outlet pipe 30, and the outlet of the water outlet pipe 30 is the hot water output end of the gas water heater 100. The third temperature sensing member 32 can thus feed back the temperature of the outputted hot water to the controller 70, facilitating accurate control of the airflow valve by the controller 70.
In some embodiments, the length of the water outlet pipe 30 between the outlet of the bypass pipe 60 and the third temperature detection member 32 is not less than 50 mm. So that the water in the bypass pipe 60 and the water in the outlet pipe 30 have a sufficient mixing distance, and the water flow heated by the heat exchanger 40 and the water flow passing through the bypass pipe 60 are uniformly mixed, so that the third temperature detecting member 32 can detect an accurate outlet water temperature.
In some embodiments, as shown in connection with FIG. 1, the first flow sensing member 50 is disposed between the inlet of the inlet pipe 20 and the inlet of the bypass pipe 60. The gas water heater 100 further includes a second flow rate detecting member 63 provided to the bypass pipe 60 to detect a bypass flow rate through the bypass pipe 60. Specifically, the inlet of the water inlet pipe 20 is used for communicating to a fluid supply source, and the change of the water flow rate at the inlet of the water inlet pipe 20 is equal to the change of the flow rate of the external water. The inlet of the water inlet pipe 20 is for communication to the heat exchanger 40. Since the first flow detecting member 50 is disposed between the inlet of the inlet pipe 20 and the inlet of the bypass pipe 60, the first flow detecting member 50 can accurately reflect the change of the external entering water flow, and timely switches the on-off valve 62 from the off state to the on state according to the decrease of the entering water flow. Meanwhile, the flow rate of the water flowing out of the bypass pipe 60, i.e., the bypass flow rate, can be obtained by the second flow rate detecting member 63, so that the flow rate passing through the heat exchanger 40 can be more accurately determined by the difference therebetween, and the fire power of the burner 80 can be precisely adjusted. More specifically, the first flow rate detecting member 50 and the second flow rate detecting member 63 are flow rate sensors.
In some embodiments, the on-off valve 62 is a solenoid valve. The electromagnetic valve can respond quickly under the action of current, so that the switching between the on state and the off state can be completed quickly.
Referring to fig. 2, the present invention provides a method for controlling a gas water heater, comprising the following steps:
s10: heating the main path water flow;
s20: adjusting the minimum caliber of the bypass flow channel according to the inflow rate;
s30: adjusting the heating energy of the main path water flow according to the change of the inflow water flow or the flow of the main path water flow;
s40: when the falling amplitude of the water inlet flow in the preset time is larger than the falling threshold value, the bypass flow channel is opened, so that part of water flows through the bypass flow channel to bypass the heat exchanger 40 and then is mixed with the main path water flow.
Under the condition that the flow of the water flow introduced into the gas water heater 100, i.e. the inflow water flow, is steady and normal, the bypass flow channel is in a cut-off state, so that the water flow flowing into the gas water heater 100 forms a main path water flow and absorbs heat through the heat exchanger 40. Then, the water flow after heat exchange and temperature rise flows out of the gas water heater 100. When the descending amplitude of the flow of the water flowing into the gas water heater 100 in the preset time is larger than the descending threshold value, the bypass flow channel is opened, one part of the water flowing into the gas water heater 100 from the outside is used as main flow and passes through the heat exchanger 40 to absorb heat for temperature rise, the other part of the water passes through the bypass flow channel to bypass the heat exchanger 40, and the water after heat exchange and temperature rise and the water passing through the bypass flow channel are mixed and then output to a water consumption point. Since the water flow passing through the bypass pipe 60 is not heated, the temperature of the outputted water flow can be reduced after mixing, and the problem that the temperature of the water discharged from the gas water heater 100 is too high and causes discomfort to users or is scalded by hot water is avoided. Because the minimum aperture of the bypass flow channel is adjusted according to the water inlet flow before the bypass flow channel is opened, the flow passing through the bypass flow channel can be immediately adjusted according to the corresponding minimum aperture after the bypass flow channel is opened, the adjustment adaptive time of the minimum aperture of the bypass flow channel after the bypass flow channel is opened is reduced, the flow change of the bypass flow channel caused by the adjustment of the minimum aperture of the bypass flow channel of the proportional valve 61 is avoided, and the temperature of the water flow output from the gas water heater 100 is prevented from being greatly fluctuated.
Specifically, the adjustment of the heating energy includes, but is not limited to, adjustment of the heating power, and in one embodiment, the heating power of the burner 80 is adjusted by the opening degree of the airflow valve. The bypass flow path is a flow path for communicating between the inlet pipe 20 and the outlet pipe 30, and specifically, the bypass pipe 60 is used to form all or part of the boundary of the bypass flow path. Further, the minimum diameter of the bypass flow passage is controlled by the opening degree of the proportional valve 61. More specifically, the minimum diameter position of the bypass flow path does not coincide with the position of the cutoff in the bypass flow path.
Referring to fig. 3, the method for controlling a gas water heater further includes the steps of:
s01: when the gas water heater 100 is started, if the shutdown interval is shorter than the shutdown threshold, the bypass flow channel is opened.
Specifically, the shutdown interval is the length of time between the last shutdown of the gas water heater 100 and the current startup. More specifically, when the gas water heater 100 is turned off, the flow of water and gas is stopped, and the combustion of gas is stopped. Since the remaining heat in the heat exchanger 40 is transferred to the remaining water remaining in the straight pipe although the flame on the burner 80 is extinguished while the gas water heater 100 is in the off-state. When the shutdown interval is shorter than the shutdown threshold, the straight pipe of the heat exchanger 40 is not fully cooled, and the remaining water in the straight pipe is still in the temperature rise process and has higher temperature. Since the residual water in the straight pipe is output from the outlet of the water outlet pipe 30 to the gas water heater 100, the residual water is mixed with the normal temperature water in the bypass pipe 60 when passing through the outlet of the bypass pipe 60, thereby reducing the outlet water temperature when the gas water heater 100 is restarted in a short time.
Further, when the gas water heater 100 is started, if the shutdown interval is shorter than the shutdown threshold, the minimum aperture of the bypass flow channel is adjusted to a preset value. Before the gas water heater 100 is closed to operate, the minimum caliber of the bypass flow channel changes along with the flow of the inlet water, and the minimum caliber of the bypass flow channel is adjusted to a preset value, namely the proportional valve 61 is adjusted to a preset opening degree, so that the flow of the normal-temperature water mixed with the residual water at each time can be consistent.
In some embodiments, for step S10, the main stream is heated by heat exchanger 40.
In some embodiments, for step S20, in adjusting the minimum caliber of the bypass flow path according to the intake water flow rate variation, the minimum caliber of the bypass flow path is adjusted in real time according to the intake water flow rate variation when the bypass flow path is in the cutoff state. The minimum caliber of the bypass flow channel is kept adjusted when the bypass flow channel is in a cut-off state, so that the flow passing through the bypass flow channel can adapt to the inflow after the bypass flow channel is opened, and the minimum caliber of the bypass flow channel is prevented from being adjusted to a large extent after the bypass flow channel is opened.
In some embodiments, the inlet flow rate is the flow rate of the water passing through the inlet of the inlet pipe 20 in adjusting the minimum caliber of the bypass flow path according to the inlet flow rate variation. Specifically, the flow rate of the water flowing through the inlet of the water inlet pipe 20 is detected using the first flow rate detecting member 50.
In some embodiments, in step S30, the opening degree of the airflow valve of the burner 80 may be adjusted according to the water inlet flow rate data detected by the first flow rate detector 50, the gas flow rate may be adjusted, and the heating power of the burner 80 and the heating energy of the burner 80 may be adjusted. It is also possible to determine the flow rate change of the main flow passing through the heat exchanger 40 according to the difference between the water inlet flow rate data detected by the first flow rate detector 50 and the bypass flow rate detected by the second flow rate detector 63, and adjust the opening degree of the airflow valve accordingly. It is also possible that, when the first flow rate detector 50 is disposed between the inlet of the bypass pipe 60 and the outlet of the inlet pipe 20, the flow rate of the main flow detected by the first flow rate detector 50 is changed, and then the controller 70 adjusts the opening degree of the airflow valve according to the change.
In some embodiments, for step S40, the drop threshold is 15% to 30% of the normal inlet flow rate.
Furthermore, after the bypass flow channel is opened, the minimum caliber of the bypass flow channel is adjusted according to the outlet water temperature. After the bypass flow passage is opened, the problem of slow response speed of the proportional valve 61 can be overcome by mixing the normal-temperature water with the main path water flow. The accuracy of the temperature of the output water flow can be improved by adjusting the minimum caliber of the bypass flow channel according to the temperature of the outlet water.
In some embodiments, in opening the bypass flow passage, the bypass flow passage is opened after a minimum aperture of the bypass flow passage is adjusted to the preliminary adjustment value, and the minimum aperture of the bypass flow passage is adjusted to the secondary adjustment value according to the inflow rate of water after the bypass flow passage is opened. Specifically, after the bypass flow path is opened, the controller 70 determines the secondary adjustment value according to the magnitude of the inflow water flow rate, thereby improving the adjustment accuracy of the minimum caliber of the bypass flow path and reducing the waiting time before the bypass flow path is opened.
In some embodiments, as shown in fig. 3, the gas water heater control method further includes step S50: and when the outlet water temperature is lower than the first temperature threshold value, the stop of the bypass flow passage is recovered.
Specifically, in step S50, the cutoff of the bypass flow passage is restored such that the bypass flow passage is switched from the on state to the off state. The outlet water temperature is the temperature of the water flow output by the gas water heater 100, and more specifically, the outlet water temperature is the temperature of the water flow output from the outlet of the outlet pipe 30. When the falling amplitude of the inflow water flow in the preset time is not larger than the falling threshold, the outflow water temperature is the set water temperature value, and the first temperature threshold is in the range from minus 2k to plus 5k of the set water temperature value. When the water outlet temperature is lower than the first temperature threshold value, the water inlet flow rate is shown to be increased and recovered, and after the bypass flow channel is cut off, preparation can be made for the next water inlet flow rate reduction treatment.
In some embodiments, in the step S50, in the restoration of the cutoff of the bypass flow path, the bypass flow path in the open state is cut off after the minimum diameter of the bypass flow path is reduced. Specifically, during the process of reducing the minimum orifice of the bypass flow passage, the bypass flow rate decreases. The bypass flow channel is cut off after the bypass flow rate is reduced to a certain degree, so that the sudden drop of the water yield of the gas water heater 100 caused by the sudden cut-off of the bypass flow channel can be avoided.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of controlling a gas water heater, comprising:
heating the main path water flow;
adjusting the minimum caliber of the bypass flow channel according to the inflow rate;
adjusting heating energy of the main path water flow according to the change of the water inlet flow or the flow of the main path water flow;
and when the descending amplitude of the water inlet flow in the preset time is larger than a descending threshold value, the bypass flow channel is opened, so that part of water flows through the bypass flow channel to bypass the heat exchanger and then is mixed with the main path water flow.
2. The gas water heater control method according to claim 1, wherein, in adjusting the minimum diameter of the bypass flow passage in accordance with the intake water flow rate change, the minimum diameter of the bypass flow passage is adjusted in real time in accordance with the intake water flow rate change when the bypass flow passage is in a cut-off state.
3. The gas water heater control method according to claim 1, further comprising the steps of: and when the outlet water temperature is lower than a first temperature threshold value, the stop of the bypass flow passage is recovered.
4. The gas water heater control method according to claim 3, wherein in resuming the cutoff of the bypass flow passage, the bypass flow passage in an open state is cut off after a minimum diameter of the bypass flow passage is reduced.
5. The method of claim 1, wherein after the bypass flow path is opened, the minimum diameter of the bypass flow path is adjusted according to the leaving water temperature.
6. The gas water heater control method according to claim 1, wherein in opening the bypass flow passage, the bypass flow passage is opened after a minimum aperture of the bypass flow passage is adjusted to a primary regulation value, and the minimum aperture of the bypass flow passage is adjusted to a secondary regulation value according to the inflow water flow rate after the bypass flow passage is opened.
7. The gas water heater control method according to claim 1, wherein in adjusting the minimum caliber of the bypass flow passage according to the intake water flow rate variation, the intake water flow rate is a flow rate of water flowing through an inlet of an intake pipe.
8. The gas water heater control method according to claim 1, further comprising the steps of: and when the gas water heater is started, if the shutdown interval is shorter than the shutdown threshold value, the bypass flow channel is opened.
9. The gas water heater control method according to claim 8, wherein a minimum diameter of the bypass flow passage is adjusted to a preset value when the shutdown interval is shorter than the shutdown threshold at startup of the gas water heater.
10. A gas water heater characterized by being used for implementing the gas water heater control method as claimed in any one of claims 1 to 9.
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| CN203375724U (en) * | 2013-06-19 | 2014-01-01 | 芜湖美的厨卫电器制造有限公司 | Water temperature control device for water outlet of gas water heater |
| CN208108456U (en) * | 2018-04-27 | 2018-11-16 | 芜湖美的厨卫电器制造有限公司 | Gas heater |
| CN109612074A (en) * | 2018-12-17 | 2019-04-12 | 成都前锋电子有限责任公司 | A kind of gas heater of the bypass pipe with water transfer proportioning valve |
| CN111365855A (en) * | 2020-03-16 | 2020-07-03 | 华帝股份有限公司 | Gas water heater capable of realizing multistage current limiting and temperature control and control method thereof |
| CN112611015A (en) * | 2020-12-16 | 2021-04-06 | 华帝股份有限公司 | Waterway system, heat exchange equipment and control method thereof |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203375724U (en) * | 2013-06-19 | 2014-01-01 | 芜湖美的厨卫电器制造有限公司 | Water temperature control device for water outlet of gas water heater |
| CN208108456U (en) * | 2018-04-27 | 2018-11-16 | 芜湖美的厨卫电器制造有限公司 | Gas heater |
| CN109612074A (en) * | 2018-12-17 | 2019-04-12 | 成都前锋电子有限责任公司 | A kind of gas heater of the bypass pipe with water transfer proportioning valve |
| CN111365855A (en) * | 2020-03-16 | 2020-07-03 | 华帝股份有限公司 | Gas water heater capable of realizing multistage current limiting and temperature control and control method thereof |
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