CN111912118A - Constant temperature control method of gas water heater - Google Patents
Constant temperature control method of gas water heater Download PDFInfo
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- CN111912118A CN111912118A CN202010791330.2A CN202010791330A CN111912118A CN 111912118 A CN111912118 A CN 111912118A CN 202010791330 A CN202010791330 A CN 202010791330A CN 111912118 A CN111912118 A CN 111912118A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 277
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 52
- 238000002485 combustion reaction Methods 0.000 claims description 7
- 238000003287 bathing Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 30
- 238000005070 sampling Methods 0.000 description 8
- 238000013459 approach Methods 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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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
Abstract
The invention discloses a constant temperature control method of a gas water heater, wherein the gas water heater applies the constant temperature control method in the embodiment to calculate the heat conversion relation through the acquisition of the heat conversion relation, under the environment of different water flows, the calculation is carried out through a water regulating algorithm to judge the state of the current water flow, so that the current value and the gear value output by a proportional valve are calculated through the change condition of the water flows, the opening degree of the gas proportional valve is controlled according to the current value and the gear value output by the proportional valve to enable the water outlet temperature to be close to the preset target temperature, and the constant temperature control of the gas water heater is realized. The method is simple and reliable, and can ensure that the gas water heater can keep constant outlet water temperature under different water flow environments, thereby bringing good bathing experience to users.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a constant temperature control method of a gas water heater.
Background
In the related art, most of gas water heaters are subject to water pressure, air pressure and difference of various components, so that the temperature of outlet water is often suddenly cooled and suddenly heated, and bad bathing experience of users is caused. Therefore, the constant temperature problem of the outlet water temperature of the gas water heater becomes a technical problem to be solved urgently in the existing gas water heater.
Disclosure of Invention
The invention aims to solve at least one of the problems in the prior related art to a certain extent, and therefore, the invention provides a constant temperature control method of a gas water heater, which is simple and reliable, and can ensure that the gas water heater can keep constant outlet water temperature under different water flow environments, thereby bringing good bathing experience to users.
The above purpose is realized by the following technical scheme:
a thermostatic control method of a gas water heater comprises the following steps:
starting the gas water heater and igniting for combustion;
collecting an initial water flow value L of the gas water heater;
judging whether the initial water flow value L keeps a constant state or not;
if so, calculating to obtain the heating energy E0 in the current state and performing PID algorithm control;
if not, collecting the water flow again to obtain a first water flow value L1 and a plurality of water flow values L2 in sequence;
comparing the first water flow value L1 with the difference between any one of a plurality of water flow values and a first set water flow change Q1;
if the first water flow value L1 is smaller than the difference between any one of the water flow values and the first set water flow variation Q1, judging that the current water flow is smaller, and calculating according to a first water transfer algorithm to obtain the heating energy E1 in the current state;
and if the first water flow value L1 is larger than the sum of any one of the water flow values and the first set water flow variation Q1, judging that the current water flow is increased, and calculating according to a second water transfer algorithm to obtain the heating energy E2 in the current state.
In some embodiments, the step of acquiring the initial water flow value L of the gas water heater specifically includes:
collecting a plurality of water flow values within a preset time to obtain first data, and carrying out average value calculation on the first data to obtain a water flow value L0;
continuing to collect water flow and calculating to obtain a plurality of water flow values L0;
after the maximum value and the minimum value of the plurality of water flow values L0 are removed, the average value of the remaining water flow values L0 is calculated to obtain an initial water flow value L.
In some embodiments, the heating energy E0 in the current state is calculated by the following calculation formula:
e0 ═ L × Δ T, where L is the initial water flow rate and Δ T is the amount of temperature change.
In some embodiments, the first water diversion algorithm is specifically:
e1 ═ E0- Δ Q ×. Δ T, where E0 is the heating energy in the constant state, Δ Q is the difference between the first water flow value L1 and the most recently collected water flow value of the plurality of water flow values L2, and Δ T is the temperature change amount.
In some embodiments, the second watering algorithm is specifically:
e2 ═ E0+ × Δ Q × Δ T, where E0 is the heating energy at constant state, Δ Q is the difference between the first water flow value L1 and the most recently collected water flow value of the plurality of water flow values L2, and Δ T is the temperature change amount.
In some embodiments, the step of calculating according to the first water regulation algorithm to obtain the heating energy E1 in the current state further includes:
after the heating energy E1 in the current state is obtained, setting the first water flow value L1 as a second set water flow variation Q2;
continuing to gather water flow again to obtain a plurality of water flow values L3 in sequence;
when any one of the water flow values L3 is larger than the difference value between the second set water flow variation Q2 and a first preset threshold value;
and calculating according to a third water adjusting algorithm to obtain the heating energy E3 in the current state.
In some embodiments, the third watering algorithm is specifically:
e3 ═ E1- Δ Q ×. Δ T, where E1 is the heating energy at the last water flow rate, Δ Q is the difference between the first and last water flow rate values of the plurality of water flow rate values L3, and Δ T is the temperature change amount.
In some embodiments, the step of calculating according to the second water regulation algorithm to obtain the heating energy E2 in the current state further includes:
after the heating energy E2 in the current state is obtained, setting the first water flow value L1 as a third set water flow variation Q3;
continuing to gather water flow again to obtain a plurality of water flow values L4 in sequence;
when any one of the water flow values L4 is larger than the sum of the third set water flow variation Q3 and a second preset threshold value;
and calculating according to a fourth water regulation algorithm to obtain the heating energy E4 in the current state.
In some embodiments, the fourth water diversion algorithm is specifically:
e4 ═ E2+ × Q × Δ T, where E2 is the heating energy at the last water flow state, Δ Q is the difference between the first and last water flow values of the plurality of water flow values L4, and Δ T is the amount of temperature change.
In some embodiments, the method of thermostatic control further comprises:
and if the water flow value acquired at any time is smaller than a preset safety factor, closing the gas water heater.
Compared with the prior art, the invention at least comprises the following beneficial effects:
1. the constant temperature control method of the gas water heater is simple and reliable, and can keep the constant outlet water temperature of the gas water heater under different water flow environments, thereby bringing good bathing experience to users.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for controlling gear-shifting according to an embodiment of the present invention;
FIG. 2 is a graph of sample period versus water flow rate in an embodiment of the present invention;
FIG. 3 is a table of control parameters in an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of the claims of the present invention.
As shown in fig. 1 to 3, this embodiment provides a thermostatic control method for a gas water heater, where the gas water heater applies the thermostatic control method in this embodiment to calculate a heat conversion relationship through collection of a heat conversion relationship, and under different water flow environments, calculates through a water diversion algorithm to determine a current water flow state, so as to calculate a current value and a gear value output by a proportional valve according to a change condition of the water flow, and further controls an opening degree of a gas proportional valve according to the current value and the gear value output by the proportional valve to make a water outlet temperature approach a preset target temperature, so that the gas water heater realizes thermostatic control.
The constant temperature control method of the gas water heater specifically comprises the following steps:
and step S101, starting the gas water heater and igniting for combustion.
In the embodiment, the gas water heater is in a standby state, ignition is started after a water flow signal is detected, and if a water flow signal is not detected, the proportional valve is closed to extinguish so as to stop working.
And S102, acquiring an initial water flow value L of the gas water heater.
In the embodiment, a plurality of water flow values are collected within a preset time to obtain first data, and the average value of the first data is calculated to obtain a water flow value L0;
continuously collecting water flow and calculating to obtain a plurality of water flow values L0;
after the maximum value and the minimum value of the plurality of water flow rate values L0 are removed, the remaining water flow rate values L0 are averaged to obtain an initial water flow rate value L.
In this embodiment, the sampling period is 4 water flow pulses, and the average value is taken to obtain the water flow value L0, if the water flow is 1L/min, 8 pulse signals can be collected every 1s, if the water flow is 2L/min, 1 pulse signal can be collected every 62.5ms, and if the water flow is 10L/min, 1 pulse signal can be collected every 12.5 ms. In addition, in the embodiment, water flow is continuously collected and calculated to obtain 10 water flow values L0, the maximum value and the minimum value of the 10 water flow values L0 are removed, and then the average value of the remaining 8 water flow values is calculated to obtain the initial water flow value L, so that the water flow signal can be stabilized by the sampling method, and thus the sampling error is further eliminated.
In step S103, it is judged whether the initial water flow value L is kept constant.
If yes, the step S113 is carried out, the heating energy E0 in the current state is obtained through calculation, and PID algorithm control is carried out;
if not, the flow rate is collected again to obtain the first water flow rate value L1 and the plurality of water flow rate values L2 in sequence in step S123.
In the embodiment, if a user suddenly opens one more faucet or closes the faucet, so that the current water flow is suddenly changed, and then whether the initial water flow value L is suddenly changed is monitored, whether the initial water flow value L is kept in a constant state can be judged, when the water flow is not kept in the constant state, if a PID algorithm is continuously used, the outlet water temperature can reach a stable value within a long time, the water flow change condition can be quickly identified by using the control scheme, so that the corresponding heating energy is quickly calculated, and the opening and the gear number of the proportional valve can be calculated according to the calculated heating energy and through control parameter presetting, so that the constant temperature control can be realized.
In this embodiment, if the initial water flow value L is not changed all the time to maintain a constant state, the heating energy E0 in the current state can be calculated by the following calculation formula: and E0 is L x delta T, wherein L is an initial water flow value, and delta T is a temperature change amount, so that the opening degree and the gear number of the proportional valve can be calculated according to the calculated heating energy E0 and preset control parameters, and the thermostatic control is performed through a PID algorithm.
In this embodiment, if the initial water flow value L changes abruptly, that is, the initial water flow value L does not keep a constant state, the above sampling cycle, that is, 4 water flow pulses are used for sampling, and the sampling frequency is 100 sampling signals per time in a cycle of 625ms to 1.25s, so as to obtain the following sampling data: a 0, a 1, …, a 99, a 0 is the latest sampled set of values, a 99 is the oldest set of values, a 0, a 1, …, a 99 are updated once per sample, so that updated a 0 is the first water flow value L1 and updated a 1, …, a 99 are the plurality of water flow values L2.
Step S104, comparing the first water flow value L1 with the difference between any one of a plurality of water flow values and the first set water flow variation Q1;
step S114, if the first water flow value L1 is smaller than the difference between any one of the water flow values and the first set water flow variation Q1, judging that the current water flow is smaller, and calculating according to a first water transfer algorithm to obtain the heating energy E1 in the current state;
and step S124, if the first water flow value L1 is larger than the sum of any one of the water flow values and the first set water flow variation Q1, judging that the current water flow is increased, and calculating according to a second water regulation algorithm to obtain the heating energy E2 in the current state.
In the present embodiment, it is determined whether the first water flow value L1 is smaller than the difference between any one of the plurality of water flow values and the first set water flow variation Q1 to determine whether the current water flow is abruptly changed due to a smaller water flow value or a larger water flow value.
In this embodiment, if the first water flow value L1 is smaller than the difference between any one of the plurality of water flow values and the first set water flow variation Q1, i.e., a [0] < a [ i ] -Q1, where i is 1 to 99, Q1 is preferably set to 1-2L/min, so as to determine that the current water flow rate is small, then the heating energy E1 in the current state is calculated by the first water adjustment algorithm: e1 ═ E0- Δ Q × Δ T, where E0 is the heating energy in a constant state, Δ Q is the difference between the first water flow value L1 and the most recently collected water flow value among the plurality of water flow values L2, and Δ T is the temperature variation, so that the opening degree and the number of gears of the proportional valve can be estimated according to the calculated heating energy E1 and preset by controlling parameters, and the thermostatic control can be realized.
In this embodiment, after obtaining the heating energy E1 in the current state, the first water flow value L1 is set as a second set water flow variation Q2, that is, a [0] after updating is set as a second set water flow variation Q2, water flow is continuously collected again to obtain a plurality of water flow values L3 in sequence, that is, collection is continuously continued to obtain 20 sets of water flow data b [0], b [1]. b [19], until any one of the plurality of water flow values L3 is greater than a difference between the second set water flow variation Q2 and a first preset threshold, that is, b [ i ] < Q2-0.5, where i is 0 to 19, and then calculation is performed according to a third water regulation algorithm to obtain the heating energy E3 in the current state, where the third water regulation algorithm specifically is: e3 is E1- Δ Q × Δ T, where E1 is the heating energy in the previous water flow state, Δ Q is the difference between the first and last water flow values of the multiple water flow values L3, and Δ T is the temperature variation, so that the opening degree and the number of gears of the proportional valve can be calculated according to the calculated heating energy E3 and preset control parameters, and thermostatic control can be realized.
In this embodiment, if the first water flow value L1 is greater than the sum of any one of the plurality of water flow values and the first set water flow variation Q1, i.e., a [0] > a [ i ] + Q1, where i is 1 to 99, Q1 is preferably set to 1-2L/min, so as to determine that the current water flow rate is increased, then the heating energy E2 in the current state is calculated by the second water regulation algorithm: e2 ═ E0 +. DELTA.q ×. DELTA.t, where E0 is the heating energy in a constant state, Δ Q is the difference between the first water flow value L1 and the most recently collected water flow value of the plurality of water flow values L2, and Δ T is the temperature variation, so that the opening degree and the number of gears of the proportional valve can be estimated according to the calculated heating energy E2 and preset by controlling parameters, and thermostatic control can be realized.
In this embodiment, after obtaining the heating energy E2 in the current state, the first water flow value L1 is set as a third set water flow variation Q3, that is, an updated a [0] is set as the third set water flow variation Q3, water flow is continuously collected again to obtain a plurality of water flow values L4 in sequence, that is, collection is continuously performed to obtain 20 sets of water flow data c [0], c [1]. c [19], until any one of the plurality of water flow values L4 is greater than a sum of the second set water flow variation Q3 and a second preset threshold, that is, c [ i ] > Q2+0.5, where i is 0 to 19, and then calculation is performed according to a fourth water regulation algorithm to obtain the heating energy E4 in the current state, where the fourth water regulation algorithm specifically is: e4 is E2 +. DELTA.Q.times.DELTA.T, where E2 is the heating energy in the previous water flow state, DELTA.Q is the difference between the first and last water flow values of the plurality of water flow values L4, and DELTA.T is the temperature change amount, so that the opening degree and the number of shift positions of the proportional valve can be calculated by presetting control parameters according to the calculated heating energy E4, and thermostatic control can be realized.
In this embodiment, if the water flow value collected at any time is smaller than a preset safety factor, the gas water heater is turned off to prevent the over-temperature or dry-burning situation of the small-flow heating, wherein the preset safety factor is preferably 2.0L/min, but not limited to the above value, and may be set to other more suitable values according to actual requirements.
In this embodiment, the heat conservation model of the gas water heater is hot water heating heat, i.e. gas combustion heat-heat dissipation heat. The heating heat of the hot water can be represented by the formula E ═ CM Δ T, i.e. E ^ Q × Δ T, and in addition, the effective energy of the part of the gas combustion energy-heat dissipation heat can be regarded as being in a direct proportion relation with the gas proportional valve.
The energy level E ═ Q ×. Δ T is set, and from this, the proportion E ∈ B can be obtained.
A PID control model: q, TInto、TTargetIs a known amountThe proportion B is obtained from the proportional relation, and T is obtained at the momentGo outBy setting the control deviation Err to TGo out-TTargetPID operations are performed to continuously correct the B ratio so that Err approaches 0.
In this embodiment, the constant temperature model shows that the combustion heat system is regarded as a whole, only the input of the fuel gas is concerned, the output of the temperature and the flow rate are controlled and input through the output difference to form closed-loop control, so that the fuel gas system has certain adaptivity, but the delay constant of the temperature sensor, the degree of charge of the flame combustion, the gas purity, the gas pressure stability and the like all affect the control stability of the system, such as: the temperature sensor delay constant (thermal inertia, hysteresis) was 1.8S.
In this embodiment, as shown in fig. 3, a gas water heater fire grate is described by taking 2-4-6 segments as an example, then PH in fig. 3 is the maximum load of the whole machine, that is, the opening degree of the proportional valve is the maximum at this time, PL is the maximum load of the whole machine, that is, the opening degree of the proportional valve is the maximum at this time, and all parameters in fig. 3 need to be entered into a controller program for load calculation, so as to realize accurate control of the opening degree and the segment gear of the proportional valve. In the program control in this embodiment, the energy level is used as the control object, and if the current Q × Δ T is 2000, the gear is first selected to be 2, and then the proportional valve current is proportional to the energy level, so as to obtain the proportional valve current as (2000 + 880)/(2160 + 880) × (186 + 120) + 120.
What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A thermostatic control method of a gas water heater is characterized by comprising the following steps:
starting the gas water heater and igniting for combustion;
collecting an initial water flow value L of the gas water heater;
judging whether the initial water flow value L keeps a constant state or not;
if so, calculating to obtain the heating energy E0 in the current state and performing PID algorithm control;
if not, collecting the water flow again to obtain a first water flow value L1 and a plurality of water flow values L2 in sequence;
comparing the first water flow value L1 with the difference between any one of a plurality of water flow values and a first set water flow change Q1;
if the first water flow value L1 is smaller than the difference between any one of the water flow values and the first set water flow variation Q1, judging that the current water flow is smaller, and calculating according to a first water transfer algorithm to obtain the heating energy E1 in the current state;
and if the first water flow value L1 is larger than the sum of any one of the water flow values and the first set water flow variation Q1, judging that the current water flow is increased, and calculating according to a second water transfer algorithm to obtain the heating energy E2 in the current state.
2. The thermostatic control method of a gas water heater according to claim 1, wherein the step of collecting the initial water flow value L of the gas water heater specifically comprises:
collecting a plurality of water flow values within a preset time to obtain first data, and carrying out average value calculation on the first data to obtain a water flow value L0;
continuing to collect water flow and calculating to obtain a plurality of water flow values L0;
after the maximum value and the minimum value of the plurality of water flow values L0 are removed, the average value of the remaining water flow values L0 is calculated to obtain an initial water flow value L.
3. The thermostatic control method of a gas water heater as claimed in claim 1, wherein the heating energy E0 in the current state is calculated by the following calculation formula:
e0 ═ L × Δ T, where L is the initial water flow rate and Δ T is the amount of temperature change.
4. The thermostatic control method of a gas water heater according to claim 3, wherein the first water-transfer algorithm is specifically:
e1 ═ E0- Δ Q ×. Δ T, where E0 is the heating energy in the constant state, Δ Q is the difference between the first water flow value L1 and the most recently collected water flow value of the plurality of water flow values L2, and Δ T is the temperature change amount.
5. The thermostatic control method of a gas water heater according to claim 3, wherein the second water-adjusting algorithm is specifically:
e2 ═ E0+ × Δ Q × Δ T, where E0 is the heating energy at constant state, Δ Q is the difference between the first water flow value L1 and the most recently collected water flow value of the plurality of water flow values L2, and Δ T is the temperature change amount.
6. The thermostatic control method for the gas water heater as claimed in claim 1, wherein the step of calculating according to the first water-adjusting algorithm to obtain the heating energy E1 at the current state further comprises:
after the heating energy E1 in the current state is obtained, setting the first water flow value L1 as a second set water flow variation Q2;
continuing to gather water flow again to obtain a plurality of water flow values L3 in sequence;
when any one of the water flow values L3 is larger than the difference value between the second set water flow variation Q2 and a first preset threshold value;
and calculating according to a third water adjusting algorithm to obtain the heating energy E3 in the current state.
7. The thermostatic control method of a gas water heater according to claim 6, wherein the third water-transfer algorithm is specifically:
e3 ═ E1- Δ Q ×. Δ T, where E1 is the heating energy at the last water flow rate, Δ Q is the difference between the first and last water flow rate values of the plurality of water flow rate values L3, and Δ T is the temperature change amount.
8. The thermostatic control method for the gas water heater as claimed in claim 1, wherein the step of calculating according to the second water-adjusting algorithm to obtain the heating energy E2 at the current state further comprises:
after the heating energy E2 in the current state is obtained, setting the first water flow value L1 as a third set water flow variation Q3;
continuing to gather water flow again to obtain a plurality of water flow values L4 in sequence;
when any one of the water flow values L4 is larger than the sum of the third set water flow variation Q3 and a second preset threshold value;
and calculating according to a fourth water regulation algorithm to obtain the heating energy E4 in the current state.
9. The thermostatic control method of a gas water heater according to claim 8, wherein the fourth water-adjusting algorithm is specifically:
e4 ═ E2+ × Q × Δ T, where E2 is the heating energy at the last water flow state, Δ Q is the difference between the first and last water flow values of the plurality of water flow values L4, and Δ T is the amount of temperature change.
10. A thermostatic control method for a gas water heater according to any one of claims 1 to 9, characterized in that the thermostatic control method further comprises:
and if the water flow value acquired at any time is smaller than a preset safety factor, closing the gas water heater.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112665194A (en) * | 2020-12-28 | 2021-04-16 | 广东万和新电气股份有限公司 | Constant temperature control method of gas water heater and gas water heater |
| CN112856823A (en) * | 2021-01-19 | 2021-05-28 | 宁波方太厨具有限公司 | Water heater control method and control system, water heater, electronic equipment and medium |
| CN113154692A (en) * | 2021-05-25 | 2021-07-23 | 华帝股份有限公司 | Constant temperature control method and device |
| CN113357820A (en) * | 2021-04-30 | 2021-09-07 | 华帝股份有限公司 | Control method of water heater |
| CN113790530A (en) * | 2021-09-14 | 2021-12-14 | 华帝股份有限公司 | Control method of gas water heater |
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2020
- 2020-08-07 CN CN202010791330.2A patent/CN111912118A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112665194A (en) * | 2020-12-28 | 2021-04-16 | 广东万和新电气股份有限公司 | Constant temperature control method of gas water heater and gas water heater |
| CN112665194B (en) * | 2020-12-28 | 2022-04-08 | 广东万和新电气股份有限公司 | Constant temperature control method of gas water heater and gas water heater |
| CN112856823A (en) * | 2021-01-19 | 2021-05-28 | 宁波方太厨具有限公司 | Water heater control method and control system, water heater, electronic equipment and medium |
| CN113357820A (en) * | 2021-04-30 | 2021-09-07 | 华帝股份有限公司 | Control method of water heater |
| CN113154692A (en) * | 2021-05-25 | 2021-07-23 | 华帝股份有限公司 | Constant temperature control method and device |
| CN113790530A (en) * | 2021-09-14 | 2021-12-14 | 华帝股份有限公司 | Control method of gas water heater |
| CN113790530B (en) * | 2021-09-14 | 2022-12-06 | 华帝股份有限公司 | Control method of gas water heater |
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