CN109099594B - Automatic water injection and automatic drainage system of gas heating water heater - Google Patents
Automatic water injection and automatic drainage system of gas heating water heater Download PDFInfo
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- CN109099594B CN109099594B CN201810991737.2A CN201810991737A CN109099594B CN 109099594 B CN109099594 B CN 109099594B CN 201810991737 A CN201810991737 A CN 201810991737A CN 109099594 B CN109099594 B CN 109099594B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
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- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention belongs to the technical field of heating equipment, and provides an automatic water injection and automatic water drainage system of a gas heating water heater and the gas heating water heater with the same. The automatic water injection system comprises: a main control panel; the external water pressure sensor is used for detecting the water pressure of the water inlet pipe of the heating water heater and is positioned at the front end of the water inlet valve; the one-way valve is used for controlling water flow to flow into the unit only and not flow out of the unit and is positioned at the front end of the water inlet valve; and the internal water pressure sensor is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve. The automatic drainage system includes: a main control panel; the drain valve is used for unit pressure relief and water drainage of the heating water heater and is positioned at the front end of a water inlet of the water pump; an internal water pressure sensor; a direct current rechargeable power supply. The invention adopts an automatic water injection mode to replace manual water injection, thereby realizing unmanned intelligent operation of water injection operation of the unit and timely water injection; the function of automatic drainage when increasing the trouble has eliminated because the water freezes the potential safety hazard that causes the unit to freeze out in the unit.
Description
Technical Field
The invention belongs to the technical field of heating equipment, and particularly relates to an automatic water injection and automatic drainage system of a gas heating water heater.
Background
The heating of a wall-mounted water heater for gas heating in a city is a development trend of heating in rural areas in winter. However, at present, the domestic gas heating wall-mounted water heater industry generally uses a manual water injection mode to inject water into a heating system. In northern rural areas, rural tap water systems are complex, the water pressure fluctuation is large, and water is often cut off. When the wall-mounted boiler is used, if a user does not close the water inlet valve in time after water injection operation, when a water supply system has a water cut-off fault, water in the whole heating system flows back to the water supply system, so that a unit is stopped and cannot normally operate. And when the running water system resumes to send water, the user needs to manually inject water again, and the operation is troublesome.
Meanwhile, when the heating system is in an abnormal condition, the unit of the heating system stops running due to any unit fault, water cut, power cut, gas cut and the like of the heating system, the temperature drop speed in winter in northern areas is extremely high, once residual water in the unit is easy to cause the water pipe to be frozen, and even the risk of freezing parts exists. When the abnormal condition of the unit is eliminated, the user needs to unfreeze the water supply pipe, the whole unit is heated, the unit can be restarted, the operation is very complicated, and the potential safety hazard is large.
Therefore, how to control the water flow of the gas heating stove, prevent the water flow in the heating system from flowing backwards when the water supply system is cut off, and avoid the damage caused by the residual freezing of the water after the unit of the heating system is shut down becomes a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
In view of the above problems in the prior art, it is an object of the present invention to provide an automatic water injection system for a gas-fired water heater, which uses an automatic water injection method instead of manual water injection. The device is used for solving the gas heating stove water injection operation and frequently just loaded down with trivial details, forget that the water injection can lead to the unit to shut down, and when running water system when cutting off water rivers in the heating stove flow backward the technical problem such as, has realized that unit water injection operation unmanned intelligent operation and water injection are timely, and perfect solution water pressure is to the unusual restriction that causes of unit operation.
The invention also aims to provide an automatic water drainage system of the gas heating water heater, which increases the function of automatic water drainage in case of failure. The device still is used for solving when heating stove unit fault shut down, and there is a large amount of water in the unit inside, causes the unit by the technical problem who freezes bad, has eliminated because the frozen potential safety hazard that causes the unit to freeze of water in the unit. Combine automatic water injection and automatic drainage function, the device has realized automatic drainage behind the heating stove unit failure mechanism and automatic water injection behind the trouble discharge, has saved the loaded down with trivial details operation of user's water injection once more.
The invention further aims to provide the gas heating water heater, which is provided with the automatic water injection system and the automatic water drainage system.
The invention provides an automatic water injection system of a gas heating water heater, which comprises:
the main control board is used for receiving signals of the external water pressure sensor and the internal water pressure sensor and controlling the opening and closing of the water inlet valve and the operation of the water pump;
the external water pressure sensor is used for detecting the water pressure of the water inlet pipe of the heating water heater and is positioned at the front end of the water inlet valve;
the one-way valve is used for controlling water flow to flow into the unit only and not flow out of the unit and is positioned at the front end of the water inlet valve;
the internal water pressure sensor is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve;
when the heating water heater is normally used, the water inlet valve is closed; when the internal water pressure sensor detects that the internal water pressure of the heating water heater is less than the preset internal water pressure, the main control board triggers an automatic water injection function;
under the automatic water injection function, when the internal water pressure sensor detects that the internal water pressure of the heating water heater is less than the preset internal water pressure and the external water pressure sensor detects that the water pressure of the water inlet pipe is greater than or equal to the preset water inlet pressure, the main control board controls to open the water inlet valve and start the water pump; when the internal water pressure sensor detects that the internal water pressure of the heating water heater is less than the preset internal water pressure and the external water pressure sensor detects that the water pressure of the water inlet pipe is less than the preset water inlet water pressure, the main control board reminds a user; when the internal water pressure sensor detects that the internal water pressure of the heating hot water furnace is greater than or equal to the limit internal water pressure, the main control board controls to close the water inlet valve.
In the technical scheme, the preset internal water pressure is the lowest water pressure which does not need to be injected into the internal pipeline of the heating water heater; the preset water inlet pressure is the lowest water pressure capable of normally injecting water in a pipeline (a tap water system) of the water inlet pipe; the limit internal water pressure is the lowest water pressure at which water injection can be stopped in the internal pipe of the heating water heater.
Furthermore, when the heating water heater is normally used, when the external water pressure sensor detects that the water pressure of the water inlet pipe is less than the preset water inlet pressure, the main control board reminds a user.
The invention adopts the one-way valve, so that the water of the heating water heater can not flow back to the tap water system. And the detection of the external water pressure sensor and the internal water pressure sensor is combined to judge whether the tap water system normally supplies water, and if the water supply is not normal, the water inlet valve is closed, so that the condition that the water flow of the heating water heater unit flows back to the tap water system is further avoided.
The invention also provides an automatic water drainage system of the gas heating water heater, which comprises:
the main control board is used for receiving the abnormal operation of the unit and the signals of the internal water pressure sensor and controlling the opening and closing of the drainage valve and the operation of the water pump;
the drain valve is used for unit pressure relief and water drainage of the heating water heater and is positioned at the front end of a water inlet of the water pump;
the internal water pressure sensor is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve;
a direct current rechargeable power source for temporarily providing electrical energy;
when the heating water heater is normally used, the drain valve is closed, and the main control panel is powered by an alternating current power supply; when the unit is controlled to stop manually through the main control panel, the main control panel does not trigger the automatic drainage function; when the unit is stopped due to abnormal reasons, the main control board triggers an automatic drainage function;
under the automatic drainage function, the main control panel is powered by the direct-current rechargeable power supply and controls the drainage valve to be opened to automatically drain water; when the internal water pressure sensor detects that the internal water pressure of the heating hot water furnace is less than or equal to the water drainage limiting water pressure, the main control panel controls the water drainage valve to be closed.
In the technical scheme, the unit is electromechanical equipment such as a water pump, a fan, a burner, a heat exchanger and the like in the heating water heater for realizing heating and water heating functions. The drainage limiting water pressure is the highest water pressure which is not required for drainage of the internal pipeline of the heating water heater.
Furthermore, when the heating water heater is normally used, the alternating current power supply charges the direct current rechargeable power supply until the electric quantity is full.
Further, the main control panel also comprises a timer, and when the whole heating water heater is suddenly powered off, the timer starts to time; when the timer counts time and reaches preset drainage time, the main control board triggers an automatic drainage function; if the heating water heater is normally powered on when the time of the timer does not reach the preset drainage time, the main control board does not trigger the automatic drainage function, and the unit normally operates. The preset drainage time is the minimum time for the main control panel to trigger the automatic drainage function when the whole heating water heater is suddenly powered off.
Further, the drain valve is an electric control drain valve or a mechanical response type drain valve. The mechanical response type drain valve is used for automatically opening the drain valve when the water pump is stopped so as to automatically drain water. If the electric control drain valve is installed, the opening and closing of the drain valve can be controlled by the main control panel according to a logic algorithm, for example, the automatic drain function cannot be triggered when a standby state is manually set; if the mechanical response type drain valve is installed, the automatic drainage function can be triggered as long as the water pump stops running, and the automatic drainage process can be carried out first even if the standby state is set manually.
Furthermore, after the heating water heater performs the automatic water drainage function, if the abnormal reasons of the unit are eliminated, the main control board triggers the automatic water injection function.
The abnormal reasons comprise unit faults, power failure, gas cut and the like.
The invention also provides a gas heating water heater which is provided with the automatic water injection system and the automatic water drainage system.
The invention has the following beneficial effects:
1. the automatic sensing device can automatically sense whether the tap water system of the user has water or not or the phenomenon of insufficient water pressure, give an alarm and remind the user to check the tap water system.
2. The whole water injection process of the heating water heater is unmanned, automatic water injection can be carried out as long as an external water pressure sensor detects water pressure, and the water pressure which is most suitable for running of the unit can be supplemented by accurate water injection.
3. When any abnormal condition of the unit causes the unit to stop, the drainage device is automatically triggered to drain water, secondary starting trouble caused by freezing of the unit due to too low temperature after the unit is stopped is prevented, manual drainage is not needed, and the device is safe and reliable.
Drawings
Fig. 1 is a schematic diagram of a heating water heater and an automatic water injection and automatic drainage system in embodiment 1 of the present invention;
FIG. 2 is a logic diagram of an automatic water injection control in embodiment 1 of the present invention;
FIG. 3 is a logic diagram of automatic water discharge control in embodiment 1 of the present invention;
the system comprises a wind pressure switch 1, a fan 2, a main heat exchanger 3, a safety temperature limiter 4, a heating water outlet temperature sensor 5, an electric three-way valve 6, a gas proportional valve 7, a domestic hot water outlet temperature sensor 8, a plate heat exchanger 9, a water outlet valve 10, an expansion water tank 11, an ignition needle 12, a fire detection needle 13, a burner 14, a water pump 15, a drain valve 16, an internal water pressure sensor 17, a water flow sensor 18, a water inlet valve 19, an external water pressure sensor 20, a check valve 21, a heating water outlet, a domestic hot water outlet, a gas inlet, a condensed water drainage and system pressure relief port D, a domestic hot water inlet E and a heating water return port F.
Detailed Description
In order to more clearly illustrate the technical solutions of the present invention, the following description is given with reference to specific embodiments and accompanying drawings, and it is obvious that the embodiments in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained according to these embodiments without any inventive work.
Example 1
The automatic water injection system and the automatic water drainage system of the gas heating water heater in the embodiment are installed on the basis of the dual-purpose heating water heater. The principle and structure of the dual-purpose heating water heater in the embodiment are shown in fig. 1.
The gas heating water heater comprises a main heat exchanger 3, a burner 14, a fan 2, a plate heat exchanger 9 and a water pump 15. A wind pressure switch 1 is installed on the fan 2, and a flue gas waste heat recovery condenser is arranged at the rear end of the fan. An ignition needle 12 and a fire detection needle 13 are arranged on the combustor 14, and the combustor 14 is communicated with a gas inlet C through a gas proportional valve 7. The downstream of the main heat exchanger 3 is connected with a heating pipeline which leads to a heating water outlet A, and the heating pipeline is provided with a safety temperature limiter 4, a heating water outlet temperature sensor 5 and a water outlet valve 10. The heating pipeline is communicated with the plate heat exchanger 9 through one end of the electric three-way valve 6, and the plate heat exchanger is also connected with a domestic hot water outlet pipeline communicated with a domestic hot water outlet B, a water inlet pipeline communicated with a domestic hot water inlet E and a heating water return pipeline communicated with a heating water return port F. Wherein, the domestic hot water outlet pipeline is provided with a domestic hot water outlet temperature sensor 8, and the water inlet pipeline is provided with a water inlet valve 19 and a water flow sensor 18. The upstream of the main heat exchanger 3 is connected with a water pump 15 through a flue gas waste heat recovery condenser. The water inlet end of the water pump 15 is connected with a heating water return port F, and the expansion water tank 11 is connected with the side of the water inlet end of the water pump.
The gas heating water heater in the embodiment is provided with an automatic water injection system, the system comprises a main control panel, an external water pressure sensor 20, an internal water pressure sensor 17 and a one-way valve 21, and the external water pressure sensor 20, the one-way valve 21 and the internal water pressure sensor 17 are all communicated with the main control panel;
a main control board (not shown) for receiving signals from the external water pressure sensor 20 and the internal water pressure sensor 17, controlling the opening and closing of the water inlet valve 19 and the operation of the water pump 15;
the external water pressure sensor 20 is used for detecting the water pressure of a water inlet pipe of the heating water heater and is positioned at the front end of the water inlet valve 19;
the one-way valve 21 is used for controlling water flow to flow into the unit only and not flow out of the unit and is positioned at the front end of the water inlet valve 19;
the internal water pressure sensor 17 is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve 19.
The logical control of the automatic water filling apparatus of this embodiment is shown in FIG. 2.
When the heating water heater is normally used, the water inlet valve 19 is closed; when the internal water pressure sensor 17 detects that the internal water pressure of the heating water heater is less than the predetermined internal water pressure P1When the water is filled, the main control board triggers an automatic water injection function; when the external water pressure sensor 20 detects that the water pressure of the water inlet pipe is less than the preset water inlet pressure P2And the main control panel reminds a user of insufficient water pressure of the tap water system.
Under the automatic water injection function, when the internal water pressure sensor 17 detects that the internal water pressure of the heating water heater is less than the preset internal water pressure P1And the external water pressure sensor 20 detects that the water pressure of the water inlet pipe is greater than or equal to the preset water inlet pressure P2When the water pump is started, the main control board controls to open the water inlet valve 19 and start the water pump 15; when the internal water pressure sensor 17 detects that the internal water pressure of the heating water heater is less than the predetermined internal water pressure P1And the external water pressure sensor 19 detects that the water pressure of the water inlet pipe is less than the preset water inlet pressure P2When the running water system is detected, the main control panel reminds the user to check the running water system; when the internal water pressure sensor 17 detects that the internal water pressure of the heating hot water furnace is greater than or equal to the limit internal water pressure P3When the water inlet valve 19 is closed, the main control board controls.
The predetermined internal water pressure P1The lowest water pressure without water injection in the internal pipeline of the heating water heater; the predetermined water inlet pressure P2The minimum water pressure of the water inlet pipe (tap water system) for normal water injection; the limiting internal water pressure P3The lowest water pressure for stopping water injection in the internal pipeline of the heating water heater.
The gas heating water heater in the embodiment is also provided with an automatic drainage system, and the system comprises a main control panel, a drainage valve 16, an internal water pressure sensor 17 and a direct-current rechargeable power supply. The drain valve 16 is an electrically controlled drain valve. The drain valve 16, the internal water pressure sensor 17 and the direct-current rechargeable power supply are communicated with the main control board.
And the main control board is used for receiving signals of the unit operation abnormity and the internal water pressure sensor 17 and controlling the opening and closing of the drain valve 16 and the operation of the water pump 15. The internal water pressure sensor 17, the drain valve 16 and the dc rechargeable power supply are all in communication with the main control board.
The drain valve 16 is used for unit pressure relief and water drainage of the heating water heater and is positioned at the front end of a water inlet of the water pump 15;
the internal water pressure sensor 17 is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve 19;
the direct-current rechargeable power supply is used for supplying electric energy to the main control panel, the internal water pressure sensor and the drain valve.
The logic control of the automatic water discharging device of the present embodiment is shown in fig. 3.
When the heating water heater is normally used, the drain valve 16 is closed, and the main control panel is powered by an alternating current power supply; when the unit is controlled to stop manually through the main control panel, the main control panel does not trigger the automatic drainage function; when the unit is stopped due to abnormal reasons, the main control board triggers an automatic drainage function; the alternating current power supply charges the direct current rechargeable power supply until the electric quantity is full.
In the automatic drainage functionThe main control panel is powered by a direct-current rechargeable power supply and controls the drainage valve 16 to be opened for automatic drainage; when the internal water pressure sensor 17 detects that the internal water pressure of the heating hot water furnace is less than or equal to the water discharge limit water pressure P4At this time, the main control board controls the drain valve 16 to be closed.
The unit is electromechanical equipment such as a water pump 15, a fan 2, a burner 14, heat exchangers 3 and 9 and the like in the heating water heater for realizing heating and hot water functions. The water discharge limit water pressure P4The highest water pressure for draining water is not needed for the internal pipeline of the heating water heater.
The main control board also comprises a timer, and when the whole heating water heater is suddenly powered off, the timer starts to time; when the timer counts time and reaches preset drainage time T, the main control board triggers an automatic drainage function; if the heating water heater is normally powered on when the timer time does not reach the preset drainage time T, the main control board does not trigger the automatic drainage function, and the unit normally operates. And the preset drainage time T is the minimum time for triggering the automatic drainage function by the main control board when the whole heating water heater is suddenly powered off.
After the heating water heater performs the automatic water drainage function, if the abnormal reasons of the unit are eliminated, the main control panel triggers the automatic water injection function.
The abnormal reasons comprise unit faults, power failure, gas cut and the like.
In actual equipment, condensed water discharged by the automatic water discharging function and unit accumulated water flow out through the condensed water discharging and system pressure relief port E.
Example 2
The difference between the gas-fired heating water heater, the automatic water injection system and the automatic water discharge system in the embodiment is that the automatic water discharge system has a different structure.
The drain valve in the automatic drainage system is a mechanical response type drain valve, automatic drainage is carried out as long as the water pump stops running, but drainage is carried out on the heating system under the standby condition.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an automatic water injection system of gas heating water heater which characterized in that, the system includes:
the main control board is used for receiving signals of the external water pressure sensor and the internal water pressure sensor and controlling the opening and closing of the water inlet valve and the operation of the water pump;
the external water pressure sensor is used for detecting the water pressure of the water inlet pipe of the heating water heater and is positioned at the front end of the water inlet valve;
the one-way valve is used for controlling water flow to flow into the unit only and not flow out of the unit and is positioned at the front end of the water inlet valve;
the internal water pressure sensor is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve;
when the heating water heater is normally used, the water inlet valve is closed; when the internal water pressure sensor detects that the internal water pressure of the heating water heater is less than the preset internal water pressure, the main control board triggers an automatic water injection function; when the external water pressure sensor detects that the water pressure of the water inlet pipe is smaller than the preset water inlet pressure, the main control panel reminds a user;
under the automatic water injection function, when the internal water pressure sensor detects that the internal water pressure of the heating water heater is less than the preset internal water pressure and the external water pressure sensor detects that the water pressure of the water inlet pipe is greater than or equal to the preset water inlet pressure, the main control board controls to open the water inlet valve and start the water pump; when the internal water pressure sensor detects that the internal water pressure of the heating water heater is less than the preset internal water pressure and the external water pressure sensor detects that the water pressure of the water inlet pipe is less than the preset water inlet water pressure, the main control board reminds a user; when the internal water pressure sensor detects that the internal water pressure of the heating hot water furnace is greater than or equal to the limit internal water pressure, the main control board controls to close the water inlet valve.
2. An automatic water discharge system of a gas heating water heater, the system comprising:
the main control board is used for receiving the abnormal operation of the unit and the signals of the internal water pressure sensor and controlling the opening and closing of the drainage valve and the operation of the water pump;
the drain valve is used for unit pressure relief and water drainage of the heating water heater and is positioned at the front end of a water inlet of the water pump;
the internal water pressure sensor is used for detecting the internal water pressure of the heating water heater and is positioned at the rear end of the water inlet valve;
a direct current rechargeable power source for temporarily providing electrical energy;
when the heating water heater is normally used, the drain valve is closed, and the main control panel is powered by an alternating current power supply; when the unit is controlled to stop manually through the main control panel, the main control panel does not trigger the automatic drainage function; when the unit is stopped due to abnormal reasons, the main control board triggers an automatic drainage function;
under the automatic drainage function, the main control panel is powered by the direct-current rechargeable power supply and controls the drainage valve to be opened to automatically drain water; when the internal water pressure sensor detects that the internal water pressure of the heating hot water furnace is less than or equal to the water drainage limiting water pressure, the main control panel controls the water drainage valve to be closed.
3. The automatic water discharge system of a gas-fired heating water heater according to claim 2, wherein the ac power supply charges the dc rechargeable power supply to full charge when the heating water heater is in normal use.
4. The automatic water discharge system of a gas heating water heater according to claim 2, wherein the main control board further includes a timer, and the timer starts to count time when the heating water heater is suddenly powered off as a whole; when the timer counts time and reaches preset drainage time, the main control board triggers an automatic drainage function; if the heating water heater is normally powered on when the time of the timer does not reach the preset drainage time, the main control board does not trigger the automatic drainage function, and the unit normally operates.
5. The automatic water discharge system of the gas-fired heating water heater according to claim 2, wherein the water discharge valve is an electrically controlled water discharge valve or a mechanically responsive water discharge valve.
6. The automatic water discharge system of a gas-fired heating water heater according to claim 5, wherein the mechanically responsive water discharge valve is adapted to automatically open the water discharge valve when the water pump is stopped, so as to automatically discharge water.
7. The automatic water discharge system of the gas-fired heating water heater according to claim 2, wherein the main control board triggers an automatic water injection function after the automatic water discharge function of the heating water heater is performed and if the cause of the unit abnormality is eliminated.
8. A gas-fired heating water heater, characterized in that the gas-fired heating water heater is provided with the automatic water injection system of the gas-fired heating water heater according to claim 1 and the automatic water discharge system of the gas-fired heating water heater according to any one of claims 2 to 7.
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| CN111780427B (en) * | 2020-07-02 | 2021-08-03 | 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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| CN2856845Y (en) * | 2005-08-12 | 2007-01-10 | 中山华帝燃具股份有限公司 | Temp controlled drainage freezing-proof water heater |
| JP2010078189A (en) * | 2008-09-24 | 2010-04-08 | Denso Corp | Hot water supply device |
| JP2011085347A (en) * | 2009-10-16 | 2011-04-28 | Denso Corp | Hot water supply device |
| CN201973930U (en) * | 2011-01-18 | 2011-09-14 | 繁昌县美日阳光能源设备有限责任公司 | Water supply device of solar water heater |
| CN202092317U (en) * | 2011-04-28 | 2011-12-28 | 刘为敏 | Automatic water replenishing device for fuel gas heating hot water boiler |
| CN108317727B (en) * | 2018-02-05 | 2020-08-25 | 广东美的暖通设备有限公司 | Water heater and anti-freezing control method, controller and storage medium of water path system of water heater |
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