CN219120647U

CN219120647U - Double-water tank heating and domestic hot water system of photovoltaic, photo-thermal and electric boiler

Info

Publication number: CN219120647U
Application number: CN202223538259.0U
Authority: CN
Inventors: 姜立兵; 王兴龙; 付启桐; 李迪; 张超
Original assignee: Shenyang Lanhao New Energy Technology Co ltd
Current assignee: Shenyang Lanhao New Energy Technology Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-06-02
Anticipated expiration: 2032-12-29

Abstract

The utility model belongs to the technical field of solar heating, and provides a double-tank heating and domestic hot water system of a photovoltaic, photo-thermal and electric boiler, which comprises a heat collector heating unit, a photovoltaic auxiliary heater heating unit and a radiating unit, wherein a first electromagnetic three-way valve and a second electromagnetic three-way valve are communicated with the inlet end and the outlet end of the radiating unit, the outlet end of the heat collector heating unit is communicated with the first electromagnetic three-way valve, the inlet end of the heat collector heating unit, the inlet end of the photovoltaic auxiliary heater heating unit is communicated with the second electromagnetic three-way valve, a first electromagnetic valve is arranged between the outlet end of the heat collector heating unit and the inlet end of the heat collector heating unit, a second electromagnetic valve is arranged between the inlet end of the photovoltaic auxiliary heater heating unit and the outlet end of the photovoltaic auxiliary heater heating unit, and a heat exchange component is arranged in the photovoltaic auxiliary heater heating unit. The utility model can effectively improve the utilization rate of solar energy, reduce the operation cost and energy consumption, and simultaneously ensure the heating and living requirements of users.

Description

Double-water tank heating and domestic hot water system of photovoltaic, photo-thermal and electric boiler

Technical Field

The utility model belongs to the technical field of solar heating, and particularly relates to a double-water-tank heating and domestic hot water system of a photovoltaic, photo-thermal and electric boiler.

Background

A common solar heating system is a technology for collecting solar radiation by using a heat collector and converting the solar radiation into heat energy for heating. The system takes water as a heat storage medium, and heat is sent to indoor heating and domestic water through the heat dissipation component. The heat absorption process of the heat collector is that solar radiation penetrates through the outer tube of the vacuum tube, heat is transferred to water in the tube along the inner tube wall after being absorbed by the film coating of the heat collector, the specific gravity of the water in the tube is reduced while the temperature of the water in the tube rises after heat absorption, and therefore upward flowing power is formed, and a thermosiphon system is formed. Along with the continuous upward movement of the hot water and the storage of the hot water in the upper part of the water storage tank, the water with lower temperature is continuously replenished along the other side of the pipe, and the water is circulated and reciprocated in this way, and finally the whole tank of water is raised to a certain temperature.

However, solar energy is strong in timeliness and sufficient in daytime, the heat collector is high in output and is not working at night, but heating is needed in the daytime and at night in the heating process. Therefore, in order to make up the defect that sunlight cannot be utilized at night, an electric heating mode is often adopted, and the matching mode ensures the heating reliability to a certain extent, but the heating cost is higher. Therefore, there is a need for a dual-tank heating and domestic hot water system of a photovoltaic, photo-thermal and electric boiler, which can effectively improve the utilization rate of solar energy, reduce the operation cost and energy consumption, and simultaneously ensure the requirements of user heating and domestic water.

Disclosure of Invention

The utility model aims to provide a double-tank heating and domestic hot water system of a photovoltaic, photo-thermal and electric boiler, so as to solve the problems, and achieve the purposes of effectively improving the utilization rate of solar energy, reducing the running cost and energy consumption and guaranteeing the requirements of heating and domestic water of users.

In order to achieve the above object, the present utility model provides the following solutions: the utility model provides a two water tank heating and life hot water system of photovoltaic, photo-thermal, electric boiler, includes collector heating unit, photovoltaic auxiliary heater heating unit and radiating element, the hot water inlet end of radiating element and cold water outlet end communicate respectively has first electromagnetism three-way valve and second electromagnetism three-way valve, collector heating unit's hot water outlet end the hot water outlet end of photovoltaic auxiliary heater heating unit respectively with first electromagnetism three-way valve intercommunication, collector heating unit's cold water inlet end the cold water inlet end of photovoltaic auxiliary heater heating unit respectively with second electromagnetism three-way valve intercommunication, collector heating unit's hot water outlet end with the intercommunication has first solenoid valve between collector heating unit's the cold water inlet end, photovoltaic auxiliary heater heating unit's hot water inlet end with the intercommunication has the second solenoid valve between photovoltaic auxiliary heater heating unit's the cold water outlet end, be provided with heat transfer module in the photovoltaic auxiliary heater heating unit, second solenoid valve respectively.

Preferably, the heat collector heating unit comprises a solar heat collector and a photo-thermal heat storage water tank, a first pipeline is communicated between a hot water outlet end of the solar heat collector and a water inlet end of the photo-thermal heat storage water tank, a second pipeline is communicated between a water outlet end of the photo-thermal heat storage water tank and the first electromagnetic three-way valve, a third pipeline is communicated between a cold water inlet end of the solar heat collector and the second electromagnetic three-way valve, a fourth pipeline is communicated between the second pipeline and the third pipeline, the first electromagnetic valve is communicated on the fourth pipeline, a first circulating pump is communicated on the third pipeline, and the first circulating pump is positioned between the solar heat collector and the fourth pipeline and is electrically connected with the controller.

Preferably, the heating unit of the photovoltaic auxiliary heater comprises a solar panel, an auxiliary heater, a photovoltaic heat storage water tank and a power distribution assembly, wherein the solar panel, the power distribution assembly and the auxiliary heater are sequentially and electrically connected, a fifth pipeline is communicated between a hot water outlet end of the auxiliary heater and a water inlet end of the photovoltaic heat storage water tank, a sixth pipeline is communicated between a water outlet end of the photovoltaic heat storage water tank and the first electromagnetic three-way valve, a seventh pipeline is communicated between a cold water inlet end of the auxiliary heater and the second electromagnetic three-way valve, an eighth pipeline is communicated between the sixth pipeline and the seventh pipeline, a second circulating pump is communicated on the eighth pipeline, the second circulating pump is positioned between the auxiliary heater and the eighth pipeline, the second circulating pump and the power distribution assembly are respectively and electrically connected with the controller, and the power distribution assembly is electrically connected with the mains electricity.

Preferably, the heat radiating unit comprises a heat radiating fin, a heating water inlet pipe is communicated between the first electromagnetic three-way valve and a hot water inlet end of the heat radiating fin, and a heating water return pipe is communicated between the second electromagnetic three-way valve and a cold water outlet end of the heat radiating fin.

Preferably, a second temperature sensor is arranged in the photovoltaic heat storage water tank, the second temperature sensor is electrically connected with the controller, a second T/P safety valve and a second ball float valve are fixedly connected to the top of the photovoltaic heat storage water tank, the second T/P safety valve is communicated with the inside of the photovoltaic heat storage water tank, and the photovoltaic heat storage water tank is communicated with a domestic water pipeline through the second ball float valve.

Preferably, a first temperature sensor is arranged in the photo-thermal heat storage water tank, the first temperature sensor is electrically connected with the controller, a first T/P safety valve and a first ball float valve are fixedly connected to the top of the photo-thermal heat storage water tank, the first T/P safety valve is communicated with the inside of the photo-thermal heat storage water tank, and the photo-thermal heat storage water tank is communicated with the domestic water pipeline through the first ball float valve.

Preferably, the first pipeline and the third pipeline are respectively wound with an electric tracing band on the outer wall of one end, close to the solar heat collector, of the third pipeline, and the electric tracing band is electrically connected with the power distribution assembly.

Preferably, the heat exchange assembly comprises a heat exchange coil, and the heat exchange coil is fixedly connected in the photovoltaic heat storage water tank.

The utility model has the following technical effects:

1. according to the utility model, the heat exchange assembly is arranged in the heating unit of the photovoltaic auxiliary heater, so that domestic water can be heated.

2. The utility model designs the double heating units, so that heating and heat storage can be alternately performed, solar energy is fully utilized, and high-reliability heating is realized.

3. The photovoltaic auxiliary heater heating unit has a grid-connected power generation function, can send generated energy to a power grid in a non-heating season, earns electric charges, and can recover investment cost as soon as possible.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of the present utility model;

FIG. 2 is a schematic diagram of a dual system self-circulation according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a heat collector heating in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a photovoltaic auxiliary heater heating in accordance with an embodiment of the present utility model;

1, a solar heat collector; 2. photo-thermal heat storage water tank; 3. a first electromagnetic three-way valve; 4. a second electromagnetic three-way valve; 5. a first circulation pump; 6. a first check valve; 7. a first regulating valve; 8. a solar cell panel; 9. a photovoltaic grid-connected inverter; 10. an auxiliary heater; 11. a photovoltaic heat storage water tank; 12. a second circulation pump; 13. a second check valve; 14. a second regulating valve; 15. a distribution box; 16. a first T/P relief valve; 17. a first float valve; 18. a first electromagnetic valve; 19. a second electromagnetic valve; 20. a heat sink; 21. a first temperature sensor; 22. a second temperature sensor; 23. a first pipeline; 24. a second pipeline; 25. a third pipeline; 26. a fourth pipeline; 27. a fifth pipeline; 28. a sixth pipeline; 29. a seventh pipeline; 30. an eighth pipeline; 31. a heating water inlet pipe; 32. a heating return pipe; 33. a second T/P relief valve; 34. a second float valve; 35. a controller; 36. a heat exchange coil; 37. an electric tracing band.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1-4, the utility model provides a double-water tank heating and domestic hot water system of a photovoltaic, photo-thermal and electric boiler, which comprises a heat collector heating unit, a photovoltaic auxiliary heater heating unit and a radiating unit, wherein a first electromagnetic three-way valve 3 and a second electromagnetic three-way valve 4 are respectively communicated with a hot water inlet end and a cold water outlet end of the radiating unit, a hot water outlet end of the heat collector heating unit and a hot water outlet end of the photovoltaic auxiliary heater heating unit are respectively communicated with the first electromagnetic three-way valve 3, a cold water inlet end of the heat collector heating unit and a cold water inlet end of the photovoltaic auxiliary heater heating unit are respectively communicated with the second electromagnetic three-way valve 4, a first electromagnetic valve 18 is communicated between the hot water inlet end of the heat collector heating unit and the cold water inlet end of the photovoltaic auxiliary heater heating unit, a second electromagnetic valve 19 is communicated between the hot water inlet end of the photovoltaic auxiliary heater heating unit and the cold water outlet end of the photovoltaic auxiliary heater heating unit, a heat exchange component is arranged in the photovoltaic auxiliary heater unit, and the heat collector heating unit, the first electromagnetic three-way valve 3, the second electromagnetic three-way valve 19 and the first electromagnetic three-way valve 35 are respectively connected with the first electromagnetic three-way valve 19.

The main function of the heating unit of the heat collector is to directly heat and store water in the heat collector by utilizing solar heat radiation; the main function of the heating unit of the photovoltaic auxiliary heater is to utilize solar energy to generate electricity and utilize the generated electric energy to heat and store water in the heating unit; the heat dissipation unit is mainly used for dissipating heat stored by the heat collector heating unit or the photovoltaic auxiliary heater heating unit to indoor for heating; the main function of the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 is to switch the communication between the heat radiating unit and the heat collector heating unit or the photovoltaic auxiliary heater heating unit; the primary function of the first solenoid valve 18 is to allow the collector heating unit to self-circulate; the main function of the second solenoid valve 19 is to make the photovoltaic auxiliary heater heating unit self-circulating; the main function of the heat exchange component is to heat domestic water and provide a hot water source. In the whole, the solar energy utilization device can effectively improve the solar energy utilization rate, reduce the operation cost and the energy consumption, and simultaneously ensure the heating and domestic water requirements of users.

According to a further optimization scheme, the heat collector heating unit comprises a solar heat collector 1 and a photo-thermal heat storage water tank 2, a first pipeline 23 is communicated between a hot water outlet end of the solar heat collector 1 and a water inlet end of the photo-thermal heat storage water tank 2, a second pipeline 24 is communicated between a water outlet end of the photo-thermal heat storage water tank 2 and the first electromagnetic three-way valve 3, a third pipeline 25 is communicated between a cold water inlet end of the solar heat collector 1 and the second electromagnetic three-way valve 4, a fourth pipeline 26 is communicated between the second pipeline 24 and the third pipeline 25, the first electromagnetic valve 18 is communicated on the fourth pipeline 26, a first circulating pump 5 is communicated on the third pipeline 25, the first circulating pump 5 is located between the solar heat collector 1 and the fourth pipeline 26, and the first circulating pump 5 is electrically connected with a controller 35.

In a further preferred embodiment, the third pipeline 25 is further connected with a first check valve 6 and a first regulating valve 7, and the first check valve 6 and the first regulating valve 7 are located between the solar heat collector 1 and the first circulating pump 5.

As shown in fig. 3, in the heat collector heating unit, the solar heat collector 1 is located outdoors, and the rest is located indoors. The solar heat collector 1 is a full-glass vacuum tube type solar heat collector, and the outer side of the photo-thermal heat storage water tank 2 is coated with a heat preservation layer. When the heat collector heating mode is adopted for heating, the controller 35 controls the first electromagnetic three-way valve 3 to enable the second pipeline 24 to be communicated with the hot water inlet end of the heat radiating unit, controls the second electromagnetic three-way valve 4 to enable the third pipeline 25 to be communicated with the cold water outlet end of the heat radiating unit, and simultaneously closes the first electromagnetic valve 18 and opens the second electromagnetic valve 19. The heating loop is a solar heat collector 1, a photo-thermal heat storage water tank 2, a first electromagnetic three-way valve 3, a radiating fin 20, a second electromagnetic three-way valve 4, a first circulating pump 5, a first check valve 6, a first regulating valve 7 and the solar heat collector 1.

According to a further optimization scheme, the photovoltaic auxiliary heater heating unit comprises a solar cell panel 8, an auxiliary heater 10, a photovoltaic heat storage water tank 11 and a power distribution assembly, the solar cell panel 8, the power distribution assembly and the auxiliary heater 10 are sequentially and electrically connected, a fifth pipeline 27 is communicated between a hot water outlet end of the auxiliary heater 10 and a water inlet end of the photovoltaic heat storage water tank 11, a sixth pipeline 28 is communicated between a water outlet end of the photovoltaic heat storage water tank 11 and the first electromagnetic three-way valve 3, a seventh pipeline 29 is communicated between a cold water inlet end of the auxiliary heater 10 and the second electromagnetic three-way valve 4, an eighth pipeline 30 is communicated between the sixth pipeline 28 and the seventh pipeline 29, a second electromagnetic valve 19 is communicated on the eighth pipeline 30, a second circulating pump 12 is communicated between the auxiliary heater 10 and the eighth pipeline 30, the second circulating pump 12 and the power distribution assembly are respectively and electrically connected with a controller 35, and the power distribution assembly is electrically connected with a commercial power supply.

Further preferably, the seventh pipeline 29 is also communicated with a second check valve 13 and a second regulating valve 14, and the second check valve 13 and the second regulating valve 14 are positioned between the auxiliary heater 10 and the second circulating pump 12.

As shown in fig. 4, in the photovoltaic auxiliary heater heating unit, the solar cell panel 8 is located outdoors, and the rest is located indoors. The outside of the photovoltaic heat storage water tank 11 is coated with an insulating layer. When the photovoltaic auxiliary heater heating mode is adopted for heating, the controller 35 controls the first electromagnetic three-way valve 3 to enable the sixth pipeline 28 to be communicated with the hot water inlet end of the radiating unit, controls the second electromagnetic three-way valve 4 to enable the seventh pipeline 29 to be communicated with the cold water outlet end of the radiating unit, and simultaneously opens the first electromagnetic valve 18 and closes the second electromagnetic valve 19. The heating loop at the moment is an auxiliary heater 10, a photovoltaic heat storage water tank 11, a first electromagnetic three-way valve 3, a radiating fin 20, a second electromagnetic three-way valve 4, a second circulating pump 12, a second check valve 13, a second regulating valve 14 and an auxiliary heater 10.

Further optimizing scheme, distribution subassembly includes photovoltaic grid-connected inverter 9 and block terminal 15, and solar cell panel 8 loops through photovoltaic grid-connected inverter 9 and block terminal 15 and auxiliary heater 10 electric connection, and block terminal 15 still is with commercial power electric connection.

The photovoltaic grid-connected inverter 9 has the main function of converting direct current emitted by the solar panel 8 into alternating current and supplying the alternating current to the auxiliary heater 10 and grid connection.

Further optimizing scheme, the radiating unit includes fin 20, and the intercommunication has heating inlet tube 31 between the hot water inlet end of first electromagnetism three-way valve 3 and fin 20, and the intercommunication has heating return pipe 32 between the cold water outlet end of second electromagnetism three-way valve 4 and fin 20.

Further optimizing scheme is provided with second temperature sensor 22 in the photovoltaic heat storage water tank 11, second temperature sensor 22 and controller 35 electric connection, the top fixedly connected with second T/P relief valve 33 and second ball cock 34 of photovoltaic heat storage water tank 11, the inside intercommunication of second T/P relief valve 33 and photovoltaic heat storage water tank 11, photovoltaic heat storage water tank 11 is through second ball cock 34 and domestic water pipeline intercommunication.

Further optimizing scheme is provided with first temperature sensor 21 in the photo-thermal heat storage water tank 2, and first temperature sensor 21 and controller 35 electric connection, the top fixedly connected with of photo-thermal heat storage water tank 2 first T/P relief valve 16 and first ball cock 17, the inside intercommunication of first T/P relief valve 16 and photo-thermal heat storage water tank 2, photo-thermal heat storage water tank 2 is through first ball cock 17 and domestic water pipeline intercommunication.

The second temperature sensor 22 and the first temperature sensor 21 can monitor the temperature of the water in the photovoltaic thermal storage water tank 11 and the photo-thermal storage water tank 2, respectively, and transmit the water temperature to the controller 35; the second T/P safety valve 33 and the first T/P safety valve 16 can respectively ensure that the pressure in the photovoltaic heat storage water tank 11 and the photo-thermal heat storage water tank 2 is not overrun; the second float valve 34 has the main function of automatically supplementing water when the water level in the photovoltaic heat storage water tank 11 is lower than 80%; the primary function of the first float valve 17 is to automatically replenish water when the water level in the photo-thermal heat storage water tank 2 is lower than 80%.

In a further optimized scheme, the outer walls of one ends, close to the solar heat collector 1, of the first pipeline 23 and the third pipeline 25 are respectively wound with an electric heat tracing band 37, and the electric heat tracing band 37 is electrically connected with the power distribution assembly.

The electric tracing band 37 is electrically connected with the distribution box 15, and when the circulation of the heating unit of the heat collector is stopped and the temperature in the pipeline reaches zero degree, the controller 35 supplies power to the electric tracing band 37 and starts the pipeline to keep warm; when the photo-thermal heating system is started up for a cycle, power supply to the electric tracing band 37 is stopped.

Further optimizing scheme, the heat exchange assembly includes heat exchange coil 36, and heat exchange coil 36 fixed connection is in photovoltaic heat storage water tank 11.

The fluid in the photovoltaic heat storage water tank 11 is used for heating the liquid in the heat exchange coil 36, and can be used as a domestic hot water source.

The working procedure of this embodiment is as follows: in the daytime when the sunlight is sufficient in heating season, the solar heat collector 1 stores heat to the photo-thermal heat storage water tank 2, meanwhile, the solar cell panel 8 generates power, and the photovoltaic grid-connected inverter 9 drives the auxiliary heater 10 to heat water and store heat to the photovoltaic heat storage water tank 11. When the water temperature in the photo-thermal heat storage water tank 2 rises to the specified heating temperature, the controller 35 controls the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 to enable the second pipeline 24, the radiating fins 20 and the third pipeline 25 to be communicated, controls the first electromagnetic valve 18 to be closed, and the second electromagnetic valve 19 to be opened, and simultaneously starts the first circulating pump 5 and the second circulating pump 12 to perform the heat collector heating mode heating, and at the moment, the photovoltaic auxiliary heater heating unit self-circulates. When the water temperature of the photo-thermal heat storage water tank 2 is lower than the designated temperature, the controller 35 automatically monitors the water temperature of the photovoltaic heat storage water tank 11, if the water temperature reaches the designated temperature, the controller 35 controls the first electromagnetic valve 18 to be opened, the second electromagnetic valve 19 to be closed, the first electromagnetic three-way valve 3 and the second electromagnetic three-way valve 4 enable the sixth pipeline 28, the radiating fins 20 and the seventh pipeline 29 to be communicated, and meanwhile the first circulating pump 5 and the second circulating pump 12 are started to perform heating in the photovoltaic auxiliary heater heating mode, and at the moment, the heat collector heating unit is self-circulated. When both water temperatures of the two water tanks are lower than the designated temperature, the controller 35 controls the auxiliary heater 10 to heat the heat storage medium by the mains drive to perform indoor heating.

When the indoor temperature reaches the set temperature, the first electromagnetic valve 18 and the second electromagnetic valve 19 are both opened, and the heat collector heating unit and the photovoltaic auxiliary heater heating unit enter a self-circulation mode.

In non-heating season, the solar panel 8 can be used for generating electricity and can be integrated into a power grid through the photovoltaic grid-connected inverter 9, and cost recovery is achieved through grid-connected power generation.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims

1. A double-water tank heating and domestic hot water system of a photovoltaic, photo-thermal and electric boiler is characterized in that: including collector heating unit, photovoltaic auxiliary heater heating unit and radiating element, the hot water inlet end and the cold water outlet end of radiating element communicate respectively has first electromagnetic three-way valve (3) and second electromagnetic three-way valve (4), the hot water outlet end of collector heating unit the hot water outlet end of photovoltaic auxiliary heater heating unit respectively with first electromagnetic three-way valve (3) intercommunication, collector heating unit's cold water inlet end the cold water inlet end of photovoltaic auxiliary heater heating unit respectively with second electromagnetic three-way valve (4) intercommunication, collector heating unit's hot water outlet end with communicate between collector heating unit's the cold water inlet end has first solenoid valve (18), photovoltaic auxiliary heater heating unit's hot water inlet end with communicate between photovoltaic auxiliary heater heating unit's the cold water outlet end has second solenoid valve (19), be provided with heat transfer module in the photovoltaic auxiliary heater unit, collector unit, first electromagnetic three-way valve (35), second solenoid valve (18) and first electromagnetic three-way valve (35) electric connection respectively.

2. The dual tank heating and domestic hot water system of a photovoltaic, photo-thermal, electric boiler of claim 1, wherein: the solar heat collector heating unit comprises a solar heat collector (1) and a photo-thermal heat storage water tank (2), a first pipeline (23) is communicated between a hot water outlet end of the solar heat collector (1) and a water inlet end of the photo-thermal heat storage water tank (2), a second pipeline (24) is communicated between a water outlet end of the photo-thermal heat storage water tank (2) and a first electromagnetic three-way valve (3), a third pipeline (25) is communicated between a cold water inlet end of the solar heat collector (1) and the second electromagnetic three-way valve (4), a fourth pipeline (26) is communicated between the second pipeline (24) and the third pipeline (25), the first electromagnetic valve (18) is communicated with the fourth pipeline (26), a first circulating pump (5) is communicated with the third pipeline (25), the first circulating pump (5) is located between the solar heat collector (1) and the fourth pipeline (26), and the first circulating pump (5) is electrically connected with a controller (35).

3. The dual tank heating and domestic hot water system of a photovoltaic, photo-thermal, electric boiler as set forth in claim 2, wherein: the utility model provides a photovoltaic auxiliary heater heating unit includes solar cell panel (8), auxiliary heater (10), photovoltaic heat storage water tank (11) and distribution subassembly, solar cell panel (8), distribution subassembly with electric connection in proper order is gone out to auxiliary heater (10), the hot water of auxiliary heater (10) go out the water end with the intercommunication has fifth pipeline (27) between the inlet end of photovoltaic heat storage water tank (11), the outlet end of photovoltaic heat storage water tank (11) with communicate between first electromagnetic three-way valve (3) has sixth pipeline (28), the cold water of auxiliary heater (10) intake end with communicate between second electromagnetic three-way valve (4) have seventh pipeline (29), sixth pipeline (28) with communicate between seventh pipeline (29) has eighth pipeline (30), second solenoid valve (19) communicate on eighth pipeline (30), communicate on seventh pipeline (29) has second circulating pump (12), second circulating pump (12) are located auxiliary heater (10) with electric connection (35) and electric connection.

4. The dual tank heating and domestic hot water system of a photovoltaic, photo-thermal, electric boiler of claim 1, wherein: the heat radiating unit comprises heat radiating fins (20), a heating water inlet pipe (31) is communicated between the first electromagnetic three-way valve (3) and the hot water inlet end of the heat radiating fins (20), and a heating water return pipe (32) is communicated between the second electromagnetic three-way valve (4) and the cold water outlet end of the heat radiating fins (20).

5. A dual tank heating and domestic hot water system for a photovoltaic, photo-thermal, electric boiler as set forth in claim 3, wherein: the photovoltaic heat storage water tank (11) is internally provided with a second temperature sensor (22), the second temperature sensor (22) is electrically connected with the controller (35), a second T/P safety valve (33) and a second float valve (34) are fixedly connected to the top of the photovoltaic heat storage water tank (11), the second T/P safety valve (33) is communicated with the interior of the photovoltaic heat storage water tank (11), and the photovoltaic heat storage water tank (11) is communicated with a domestic water pipeline through the second float valve (34).

6. The dual tank heating and domestic hot water system of a photovoltaic, photo-thermal, electric boiler of claim 5, wherein: the solar heat storage water tank is characterized in that a first temperature sensor (21) is arranged in the solar heat storage water tank (2), the first temperature sensor (21) is electrically connected with the controller (35), a first T/P safety valve (16) and a first float valve (17) are fixedly connected to the top of the solar heat storage water tank (2), the first T/P safety valve (16) is communicated with the inside of the solar heat storage water tank (2), and the solar heat storage water tank (2) is communicated with a domestic water pipeline through the first float valve (17).

7. A dual tank heating and domestic hot water system for a photovoltaic, photo-thermal, electric boiler as set forth in claim 3, wherein: the electric heat tracing device is characterized in that electric heat tracing bands (37) are respectively wound on the outer wall of one end, close to the solar heat collector (1), of the first pipeline (23) and the third pipeline (25), and the electric heat tracing bands (37) are electrically connected with the power distribution assembly.

8. A dual tank heating and domestic hot water system for a photovoltaic, photo-thermal, electric boiler as set forth in claim 3, wherein: the heat exchange assembly comprises a heat exchange coil (36), and the heat exchange coil (36) is fixedly connected in the photovoltaic heat storage water tank (11).