CN109099594A - A kind of gas-heating water heater automatic water filling and automatic drain system - Google Patents
A kind of gas-heating water heater automatic water filling and automatic drain system Download PDFInfo
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- CN109099594A CN109099594A CN201810991737.2A CN201810991737A CN109099594A CN 109099594 A CN109099594 A CN 109099594A CN 201810991737 A CN201810991737 A CN 201810991737A CN 109099594 A CN109099594 A CN 109099594A
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- water
- heating
- water heater
- automatic
- pressure sensor
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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
-
- 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
- F24H9/16—Arrangements for water drainage
Abstract
The invention belongs to heating equipment technical field, a kind of gas-heating water heater automatic water filling and automatic drain system, and the gas-heating water heater with it are provided.The automatic water filling system includes: master board；For detecting the external water pressure sensor of water heater for heating water inlet pipe hydraulic pressure, it is located at inlet valve front end；Unit, which can only be flowed into, for controlling water flow cannot flow out the check valve of unit, be located at inlet valve front end；For detecting the inside water pressure sensor of water heater for heating inside water pressure, it is located at inlet valve rear end.The automatic drain system includes: master board；For the drain valve that unit pressure release and water heater for heating drain, it is located at pump intake front end；Inside water pressure sensor；Direct current rechargable power supplies.The present invention replaces Manual water injection using automatic water filling mode, realizes the unmanned intelligent operation of unit water flood operations and water filling is timely；Increase self-draining function when failure, eliminates due to the security risk that water freezing causes unit freezing in unit.
Description
Technical field
The invention belongs to heating equipment technical field more particularly to a kind of gas-heating water heater automatic water fillings and automatic row
Water system.
Background technique
The heating of appearance of the city wall-mounted gas heating water heater is the development trend of rural area warming.But currently, domestic combustion gas
Heating wall-hanging water heater industry generally fills the water heating system using Manual water injection mode.In northern country area, rural area
Running water system is complicated, and water pressure fluctuations are larger, and often cut off the water.When using wall-hung boiler, if user carried out water flood operations it
Do not close inlet valve in time afterwards, when failure occurs cutting off the water in running water system, the water in entire heating system will be flowed back to
Running water system leads to compressor emergency shutdown, is unable to operate normally.And when water is sent in running water system recovery, and need user's weight
New Manual water injection, it is troublesome in poeration.
Meanwhile when abnormal conditions occurs in heating system, due to any unit failure of heating system, cuts off the water, has a power failure, stops
Gas etc. causes the unit of heating system out of service, and northern area winter temperature decrease speed is especially fast, once in unit
Portion's residual water is easy for that water pipe is caused to freeze, or even there are the risks of freezing components.And when unit abnormal conditions are eliminated,
User needs feed pipe to thaw again, heats up to entire unit, can just unit be made to restart, and operates very complicated and security risk
Greatly.
Therefore, the water flow for how controlling gas heating stove, water flow when preventing running water system from cutting off the water in heating system are fallen
It fills, and avoids damage caused by freezing after the compressor emergency shutdown of heating system because of residual moisture, become those skilled in the art urgently
Technical problem to be solved.
Summary of the invention
In view of the above technical problems existing in the prior art, an object of the present invention is just to provide a kind of gas-heating heat
Water furnace automatic water filling system, the device replace Manual water injection using automatic water filling mode.The device is for solving gas heating stove
Water flood operations are frequent and cumbersome, forget that water filling will lead to compressor emergency shutdown and water flow is fallen in heating stove when running water system is cut off the water
The technical problems such as filling realize the unmanned intelligent operation of unit water flood operations and water filling in time, hydraulic pressure have been solved perfectly to unit
It is limited caused by operation exception.
The second object of the present invention is just to provide a kind of gas-heating water heater automatic drain system, which increases failure
When self-draining function.When the device is also used to solve heating stove unit disorderly closedown, there are a large amount of water inside unit, cause
The technical issues of unit is damaged by frost eliminates due to the security risk that water freezing causes unit freezing in unit.In conjunction with automatic note
Water and automatic drainage function, the arrangement achieves infuse automatically after Auto-drainage after heating stove unit failure mechanism and failure discharge
Water eliminates the troublesome operation that user fills the water again.
The third object of the present invention is just to provide a kind of gas-heating water heater, and the gas-heating water heater is provided with
State automatic water filling system and automatic drain system.
The present invention provides a kind of gas-heating water heater automatic water filling system, the system comprises:
For receiving external water pressure sensor and inside water pressure sensor signal, the opening and closing of control inlet valve and pump operation
Master board；
For detecting the external water pressure sensor of water heater for heating water inlet pipe hydraulic pressure, it is located at inlet valve front end；
Unit, which can only be flowed into, for controlling water flow cannot flow out the check valve of unit, be located at inlet valve front end；
For detecting the inside water pressure sensor of water heater for heating inside water pressure, it is located at inlet valve rear end；
When water heater for heating normal use, inlet valve is closed；When inside water pressure sensor detects heating hot water furnace interior
When hydraulic pressure is less than predetermined inside water pressure, master board triggers automatic water filling function；
Under automatic water filling function, when inside water pressure sensor detects that water heater for heating inside water pressure is less than predetermined inside
When hydraulic pressure and external water pressure sensor detect that water inlet pipe hydraulic pressure is greater than or equal to predetermined water feeding pressure, master board control is opened
Inlet valve and starting water pump；When inside water pressure sensor detects that water heater for heating inside water pressure is less than predetermined inside water pressure and outer
When portion's hydraulic pressure sensor detects that water inlet pipe hydraulic pressure is less than predetermined water feeding pressure, user is reminded in master board；When inside water pressure passes
When sensor detects that water heater for heating inside water pressure is greater than or equal to limitation inside water pressure, inlet valve is closed in master board control.
In above-mentioned technical proposal, the predetermined inside water pressure be do not needed in water heater for heating internal pipeline water filling it is minimum
Hydraulic pressure；The predetermined water feeding pressure is the minimum hydraulic pressure that (running water system) can be filled the water normally into water pipeline；The limit
Inside water pressure processed is the minimum hydraulic pressure that can stop water filling in water heater for heating internal pipeline.
Further, in water heater for heating normal use, when external water pressure sensor detects that water inlet pipe hydraulic pressure is less than
When predetermined water feeding pressure, user is reminded in master board.
The present invention is due to that will not flow back to running water system using the water of check valve, water heater for heating.In conjunction with external water pressure
The detection of sensor and inside water pressure sensor, judges whether running water system normally send water, closes if normally not sending water
Inlet valve is closed, the flow backwards for further avoiding water heater for heating unit return running water system.
The present invention also provides a kind of gas-heating water heater automatic drain system, the system comprises:
For receiving unit operation exception and inside water pressure sensor signal, the master for controlling opening and closing of drain valve and pump operation
Control panel；
For the drain valve that unit pressure release and water heater for heating drain, it is located at pump intake front end；
For detecting the inside water pressure sensor of water heater for heating inside water pressure, it is located at inlet valve rear end；
For temporarily providing the direct current rechargable power supplies of electric energy；
When water heater for heating normal use, drain valve is closed, and master board is powered by AC power source；Pass through master control when artificial
When making sheet controls compressor emergency shutdown, master board does not trigger automatic drainage function；When unit is shut down because of abnormal cause, master board
Trigger automatic drainage function；
Under automatic drainage function, master board is powered by direct current rechargable power supplies, and controls drain valve opening, is carried out certainly
Dynamic draining；When inside water pressure sensor detects that water heater for heating inside water pressure is less than or equal to draining limitation hydraulic pressure, master control
Making sheet controls drain valve and closes.
In above-mentioned technical proposal, the unit is water pump, the wind in water heater for heating in order to realize heating and hot water function
The electromechanical equipments such as machine, burner, heat exchanger.The draining limitation hydraulic pressure is that water heater for heating internal pipeline does not need draining most
High hydraulic pressure.
Further, when water heater for heating normal use, AC power source carries out direct current rechargable power supplies to charge to electricity
It is full of.
Further, the master board further includes timer, and when the whole power-off suddenly of water heater for heating, counter is opened
Beginning timing；When reaching predetermined water discharge time when timer, master board triggers automatic drainage function；If in the timer time
Not up to predetermined water discharge time when water heater for heating normal power-up, master board do not trigger automatic drainage function, and unit is normally transported
Row.The predetermined water discharge time is that, when the whole power-off suddenly of water heater for heating, master board triggers automatic drainage function most
The small time.
Further, the drain valve is automatically controlled drain valve or mechanical response formula drain valve.The mechanical response formula draining
Valve is used to automatically open drain valve when water pump is shut down, so as to Auto-drainage.If installing automatically controlled drain valve, main control can be passed through
Plate control controls the opening and closing of drain valve according to logical algorithm, such as artificial setting standby mode will not trigger Auto-drainage
Function；If mechanical response type drain valve is installed, as long as water pump is out of service all to trigger automatic drainage function, even if artificially setting
Setting standby mode also can first carry out Auto-drainage process.
Further, water heater for heating is after carrying out automatic drainage function, if after unit abnormal cause excludes, master board
Trigger automatic water filling function.
The abnormal cause includes unit failure, has a power failure, stops the supple of gas or steam.
The present invention also provides a kind of gas-heating water heater, the gas-heating water heater is provided with above-mentioned automatic water filling system
System and automatic drain system.
The invention has the following beneficial effects:
1, it can be achieved whether automatic sensing user running water system has water or hydraulic pressure not foot phenomenon, alarm, remind
User checks running water system.
2, water heater for heating water filling is whole unmanned, as long as external water pressure sensor has detected hydraulic pressure, can carry out certainly
Dynamic water filling, and accurately the hydraulic pressure for being most suitable for operation is mended to unit in water filling.
3, when any abnormal conditions, which occurs, in unit causes compressor emergency shutdown, automatic trigger drainage arrangement is drained, and is prevented
After compressor emergency shutdown, temperature is too low to be caused unit to be frozen in and causes restarting trouble, is not necessarily to artificial drainage, securely and reliably.
Detailed description of the invention
Fig. 1 is water heater for heating and automatic water filling and automatic drain system schematic diagram in the embodiment of the present invention 1；
Fig. 2 is automatic water filling control logic figure in the embodiment of the present invention 1；
Fig. 3 is Auto-drainage control logic figure in the embodiment of the present invention 1；
Wherein, 1 is blast switch, and 2 be blower, and 3 be main heat exchanger, and 4 be safety temp.-limiting device, and 5 pass for heating leaving water temperature
Sensor, 6 be electric T-shaped valve, and 7 be gas ratio valve, and 8 be life hot water effluent's temperature sensor, and 9 be plate heat exchanger, and 10 are
Outlet valve, 11 be expansion tank, and 12 be ignition electrode, and 13 be fire testing needle, and 14 be burner, and 15 be water pump, and 16 be drain valve, and 17 are
Inside water pressure sensor, 18 be water flow sensor, and 19 be inlet valve, and 20 be external water pressure sensor, and 21 be check valve, and A is
Heating water outlet, B are life hot water outlet, and C is fuel gas inlet, and D is condensate water discharging and system decompression mouth, and E is life heat
Water water inlet, F are heating water return outlet.
Specific embodiment
In order to illustrate more clearly of technical solution of the present invention, it is illustrated below in conjunction with specific embodiments and the drawings,
It should be evident that the embodiment in being described below is only some embodiments of the present invention, those of ordinary skill in the art are come
It says, without creative efforts, other examples can also be obtained according to these embodiments.
Embodiment 1
Gas-heating water heater automatic water filling system and automatic drain system in the present embodiment are in dual-purpose heating hot water
It is installed on the basis of furnace.The principle and structure of dual-purpose water heater for heating in the present embodiment are as shown in Figure 1.
The gas-heating water heater includes main heat exchanger 3, burner 14, blower 2, plate heat exchanger 9, water pump 15.Wind
Blast switch 1 is installed, blower rear end is equipped with flue gas waste heat recovery condenser on machine 2.Burner 14 is equipped with 12 He of ignition electrode
Fire testing needle 13, burner 14 are connected to fuel gas inlet C by gas ratio valve 7.3 downstream connection heating pipe of main heat exchanger, which leads to, to be adopted
Warm water outlet A, heating pipe are equipped with safety temp.-limiting device 4, heating leaving water temperature sensors 5 and outlet valve 10.Heating pipe is logical
It crosses 6 one end of electric T-shaped valve and leads to plate heat exchanger 9, the life for leading to domestic hot-water's water outlet B is also connected on plate heat exchanger
Living hot water effluent's pipeline, the heating water return pipeline for leading to the water inlet line of domestic hot-water's water inlet E and leading to heating water return outlet F.
Wherein, domestic hot-water's outlet conduit is equipped with domestic hot-water's leaving water temperature sensors 8, and water inlet line is equipped with inlet valve 19 and water
Flow sensor 18.3 upstream of main heat exchanger connects water pump 15 by flue gas waste heat recovery condenser.The connection of 15 water inlet end of water pump is adopted
Warm water return outlet F, and expansion tank 11 is flanked in its water inlet end.
Gas-heating water heater in the present embodiment is provided with automatic water filling system, the system comprises master board, outside
Portion's hydraulic pressure sensor 20, inside water pressure sensor 17, check valve 21, the external water pressure sensor 20, check valve 21 and inside
Hydraulic pressure sensor 17 is all connected to master board；
Master board (not shown) be used for receive external water pressure sensor 20 and inside water pressure sensor 17 signal,
It controls the opening and closing of inlet valve 19 and water pump 15 operates；
External water pressure sensor 20 is located at 19 front end of inlet valve for detecting water heater for heating water inlet pipe hydraulic pressure；
Check valve 21, which can only flow into unit for controlling water flow, cannot flow out unit, be located at 19 front end of inlet valve；
Inside water pressure sensor 17 is located at 19 rear end of inlet valve for detecting water heater for heating inside water pressure.
The logic control of the present embodiment automatic water filling device is as shown in Figure 2.
When water heater for heating normal use, inlet valve 19 is closed；When inside water pressure sensor 17 detects water heater for heating
Inside water pressure is less than predetermined inside water pressure P1When, master board triggers automatic water filling function；When external water pressure sensor 20 detects
It is less than predetermined water feeding pressure P to water inlet pipe hydraulic pressure2When, master board reminds user's running water system hydraulic pressure insufficient.
Under automatic water filling function, when inside water pressure sensor 17 detects that water heater for heating inside water pressure is interior less than predetermined
Portion hydraulic pressure P1And external water pressure sensor 20 detects that water inlet pipe hydraulic pressure is greater than or equal to predetermined water feeding pressure P2When, master board
Inlet valve 19 and starting water pump 15 are opened in control；When inside water pressure sensor 17 detects that water heater for heating inside water pressure is less than in advance
Determine inside water pressure P1And external water pressure sensor 19 detects that water inlet pipe hydraulic pressure is less than predetermined water feeding pressure P2When, master board mentions
The user that wakes up checks running water system；When inside water pressure sensor 17 detects that water heater for heating inside water pressure is greater than or equal to limitation
Inside water pressure P3When, inlet valve 19 is closed in master board control.
The predetermined inside water pressure P1It is the minimum hydraulic pressure that water filling is not needed in water heater for heating internal pipeline；It is described predetermined
Water feeding pressure P2It is the minimum hydraulic pressure that (running water system) can be filled the water normally into water pipeline；The limitation inside water pressure P3
It is the minimum hydraulic pressure that can stop water filling in water heater for heating internal pipeline.
Gas-heating water heater in the present embodiment is also provided with automatic drain system, the system comprises master board,
Drain valve 16, inside water pressure sensor 17, direct current rechargable power supplies.The drain valve 16 is automatically controlled drain valve.The drain valve
16, inside water pressure sensor 17, direct current rechargable power supplies are all connected to master board.
For receiving, unit is operating abnormally and 17 signal of inside water pressure sensor, the opening and closing of control drain valve 16 and water pump 15 are transported
The master board turned.The inside water pressure sensor 17, drain valve 16 and direct current rechargable power supplies are all connected to master board.
Drain valve 16 is drained for unit pressure release and water heater for heating, is located at 15 water inlet front end of water pump；
Inside water pressure sensor 17 is located at 19 rear end of inlet valve for detecting water heater for heating inside water pressure；
Direct current rechargable power supplies are used to provide electric energy to master board, inside water pressure sensor, drain valve.
The logic control of the present embodiment self-draining arrangement is as shown in Figure 3.
When water heater for heating normal use, drain valve 16 is closed, and master board is powered by AC power source；Pass through master when artificial
When control panel controls compressor emergency shutdown, master board does not trigger automatic drainage function；When unit is shut down because of abnormal cause, main control
Plate triggers automatic drainage function；AC power source carries out charging to electricity to direct current rechargable power supplies to be full of.
Under automatic drainage function, master board is powered by direct current rechargable power supplies, and controls the opening of drain valve 16, is carried out
Auto-drainage；When inside water pressure sensor 17 detects that water heater for heating inside water pressure is less than or equal to draining limitation hydraulic pressure P4
When, master board controls drain valve 16 and closes.
The unit be in water heater for heating in order to realize the water pump 15 of heating and hot water function, blower 2, burner 14,
The electromechanical equipments such as heat exchanger 3,9.The draining limits hydraulic pressure P4The highest water of draining is not needed for water heater for heating internal pipeline
Pressure.
The master board further includes timer, and when the whole power-off suddenly of water heater for heating, counter starts timing；When
When reaching predetermined water discharge time T when timer, master board triggers automatic drainage function；If not up to pre- in the timer time
Determine water heater for heating normal power-up when water discharge time T, master board does not trigger automatic drainage function, and unit operates normally.It is described
Predetermined water discharge time T is when the whole power-off suddenly of water heater for heating, when master board triggers the minimum of automatic drainage function
Between.
Water heater for heating is after carrying out automatic drainage function, if after unit abnormal cause excludes, master board triggering is automatic
Water-filling function.
The abnormal cause includes unit failure, has a power failure, stops the supple of gas or steam.
In physical device, the condensed water and unit ponding that automatic drainage function excludes are let out by condensate water discharging and system
Press mouth E outflow.
Embodiment 2
The difference of gas-heating water heater, automatic water filling system and automatic drain system in the present embodiment is to arrange automatically
The structure of water system is different.
Drain valve in the automatic drain system is mechanical response formula drain valve, as long as water pump stalls, that is, is carried out certainly
Dynamic draining, but under ideal case, also heating system is drained.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of gas-heating water heater automatic water filling system, which is characterized in that the system comprises:
For receiving the master control of external water pressure sensor and inside water pressure sensor signal, control inlet valve opening and closing and pump operation
Making sheet；
For detecting the external water pressure sensor of water heater for heating water inlet pipe hydraulic pressure, it is located at inlet valve front end；
Unit, which can only be flowed into, for controlling water flow cannot flow out the check valve of unit, be located at inlet valve front end；
For detecting the inside water pressure sensor of water heater for heating inside water pressure, it is located at inlet valve rear end；
When water heater for heating normal use, inlet valve is closed；When inside water pressure sensor detects water heater for heating inside water pressure
When less than predetermined inside water pressure, master board triggers automatic water filling function；
Under automatic water filling function, when inside water pressure sensor detects that water heater for heating inside water pressure is less than predetermined inside water pressure
And external water pressure sensor detect water inlet pipe hydraulic pressure be greater than or equal to predetermined water feeding pressure when, master board control open water inlet
Valve and starting water pump；When inside water pressure sensor detects that water heater for heating inside water pressure is less than predetermined inside water pressure and external water
When pressure sensor detects that water inlet pipe hydraulic pressure is less than predetermined water feeding pressure, user is reminded in master board；When inside water pressure sensor
When detecting that water heater for heating inside water pressure is greater than or equal to limitation inside water pressure, inlet valve is closed in master board control.
2. gas-heating water heater automatic water filling system according to claim 1, which is characterized in that water heater for heating just
When being often used, when external water pressure sensor detects that water inlet pipe hydraulic pressure is less than predetermined water feeding pressure, user is reminded in master board.
3. a kind of gas-heating water heater automatic drain system, which is characterized in that the system comprises:
For receiving unit operation exception and inside water pressure sensor signal, the main control for controlling opening and closing of drain valve and pump operation
Plate；
For the drain valve that unit pressure release and water heater for heating drain, it is located at pump intake front end；
For detecting the inside water pressure sensor of water heater for heating inside water pressure, it is located at inlet valve rear end；
For temporarily providing the direct current rechargable power supplies of electric energy；
When water heater for heating normal use, drain valve is closed, and master board is powered by AC power source；Pass through master board when artificial
When controlling compressor emergency shutdown, master board does not trigger automatic drainage function；When unit is shut down because of abnormal cause, master board triggering
Automatic drainage function；
Under automatic drainage function, master board is powered by direct current rechargable power supplies, and controls drain valve opening, is arranged automatically
Water；When inside water pressure sensor detects that water heater for heating inside water pressure is less than or equal to draining limitation hydraulic pressure, master board
Drain valve is controlled to close.
4. gas-heating water heater automatic drain system according to claim 3, which is characterized in that water heater for heating is normal
It is full of in use, AC power source carries out charging to electricity to direct current rechargable power supplies.
5. gas-heating water heater automatic drain system according to claim 3, which is characterized in that the master board is also
Including timer, when the whole power-off suddenly of water heater for heating, counter starts timing；Reach predetermined draining when timer
When the time, master board triggers automatic drainage function；If the water heater for heating when the timer time being not up to predetermined water discharge time
Normal power-up, master board do not trigger automatic drainage function, and unit operates normally.
6. gas-heating water heater automatic drain system according to claim 3, which is characterized in that the drain valve is electricity
Control drain valve or mechanical response formula drain valve.
7. gas-heating water heater automatic drain system according to claim 6, which is characterized in that the mechanical response formula
Drain valve is used to automatically open drain valve when water pump is shut down, so as to Auto-drainage.
8. gas-heating water heater automatic drain system according to claim 3, which is characterized in that water heater for heating into
After row automatic drainage function, if after unit abnormal cause excludes, master board triggers automatic water filling function.
9. a kind of gas-heating water heater, which is characterized in that the gas-heating water heater is arranged just like claims 1 or 2 institute
The gas-heating water heater automatic water filling system stated and the gas-heating water heater as described in any one of claim 3-8 are certainly
Dynamic drainage system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810991737.2A CN109099594B (en) | 2018-08-29 | 2018-08-29 | Automatic water injection and automatic drainage system of gas heating water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810991737.2A CN109099594B (en) | 2018-08-29 | 2018-08-29 | Automatic water injection and automatic drainage system of gas heating water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109099594A true CN109099594A (en) | 2018-12-28 |
| CN109099594B CN109099594B (en) | 2020-04-07 |
Family
ID=64864192
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810991737.2A Active CN109099594B (en) | 2018-08-29 | 2018-08-29 | Automatic water injection and automatic drainage system of gas heating water heater |
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| Country | Link |
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| CN (1) | CN109099594B (en) |
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| CN109780713A (en) * | 2019-01-22 | 2019-05-21 | 珠海格力电器股份有限公司 | A kind of gas-heating water heater and its control method of band icing protection water circuit system |
| CN111780427A (en) * | 2020-07-02 | 2020-10-16 | 广东万家乐燃气具有限公司 | Gas water heater with water pressure protection function and control method thereof |
| CN115127240A (en) * | 2022-07-07 | 2022-09-30 | 美世乐(广东)新能源科技有限公司 | Control method and system for gas hot water tank |
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