A solar heating device suitable for ultra-low temperature environment

Abstract

The present application provides a solar heating device suitable for ultra-low temperature environments. The device includes an insulating shell, a solar thermal collector panel is arranged on the outside of the insulating shell, and a hot water storage tank, a heat exchanger, a terminal supply system, a dual-heat source heat pump auxiliary heating system and a control cabinet are arranged inside. The first inlet of the hot water storage tank is connected to the water supply pipe of the solar thermal collector panel, and the first outlet of the hot water storage tank is connected to the return pipe of the solar thermal collector panel via a heat collection circulation pump; the terminal supply system takes water from the second outlet of the hot water storage tank and heat exchanges it through the heat exchanger, and the first circulating water pump delivers water that meets the water supply temperature to the end user, and the return water of the terminal supply system is connected to the inlet of the heat exchanger; the outlet of the dual-heat source heat pump auxiliary heating system is connected to the user's water supply pipeline, and the inlet is connected to the user's return pipeline; when the water temperature on the user side is insufficient, the dual-heat source heat pump auxiliary heating starts to operate; the control cabinet is communicatively connected to the hot water storage tank, the heat exchanger, the terminal supply system, and the dual-heat source heat pump auxiliary heating system.

Description

Technical Field

[0001] The present application relates to the field of clean energy heating technology, and in particular to a solar heating device suitable for ultra-low temperature environments. Background Art

[0002] Most areas in northwest my country are located in severe cold and cold climate zones. The outdoor air temperature is low in winter and the heating period is long. In addition, there is a lack of relevant design standards to guide the energy-saving design of rural residential buildings. The thermal performance of rural residential buildings is poor, resulting in poor indoor thermal environment of residential buildings and high building energy consumption.

[0003] With economic development, people's demands for indoor thermal environments are increasing, and building energy consumption is becoming an increasingly important factor. Energy conservation in rural buildings is gaining increasing attention. Northwest China is rich in solar energy resources, offering significant energy-saving potential for rural residential buildings. However, due to the extremely low calculated outdoor heating temperatures in Northwest China, using solar energy alone would inevitably require an excessively large collection area and high initial investment, making it unsuitable for heating rural homes.

[0004] Whether it is possible to provide a heating device that can not only improve the thermal performance of residential buildings, but also improve energy utilization efficiency and reduce heating costs has become an important topic of continuous exploration in the field of rural heating in Northwest China. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a solar heating device that is suitable for ultra-low temperature environments, which can improve the thermal performance of residential buildings, improve energy utilization efficiency, and reduce heating costs.

[0006] According to an embodiment of the present application, a solar heating device adapted to ultra-low temperature environments is provided, comprising an insulating shell, a solar collector panel being disposed on the exterior of the insulating shell, and a hot water storage tank, a heat exchanger, a terminal supply system, a dual-source heat pump auxiliary heating system, and a control cabinet being disposed within the insulating shell;

[0007] The first inlet of the hot water storage tank is connected to the water supply pipe of the solar thermal collector panel, and the first outlet of the hot water storage tank is connected to the return pipe of the solar thermal collector panel via a heat collection circulation pump;

[0008] The terminal supply system takes water from the second outlet of the hot water storage tank and heats it in the heat exchanger, and then the first circulating water pump delivers the water that meets the water supply temperature to the end user. The return water of the terminal supply system is connected to the inlet of the heat exchanger.

[0009] The outlet of the dual-source heat pump auxiliary heating system is connected to the user's water supply pipeline, and the inlet is connected to the user's return water pipeline; when it is detected that the water temperature on the user side is insufficient, the dual-source heat pump auxiliary heating starts to operate;

[0010] The control cabinet is communicatively connected with the hot water storage tank, the heat exchanger, the terminal supply system, and the dual-heat source heat pump auxiliary heating system.

[0011] In one embodiment, the dual-heat source heat pump auxiliary heating system includes a compressor, a condenser, an expansion valve and a filter, a three-way valve, an air-cooled evaporator, and a water-cooled evaporator;

[0012] The compressor, condenser, expansion valve and filter, three-way valve and air-cooled evaporator constitute a low-temperature air source heat pump;

[0013] The compressor, condenser, expansion valve and filter, three-way valve and water-cooled evaporator constitute a water source heat pump;

[0014] The outlets of the low-temperature air source heat pump and the water source heat pump are both connected to one end of the water supply pipeline through a first electric control valve, and the other end of the water supply pipeline is provided with a terminal water supply reserved interface; the inlets of the low-temperature air source heat pump and the water source heat pump are connected to the water outlet of the heat exchanger through a second circulating water pump, and the return pipe of the heat exchanger is connected to the terminal return water reserved interface through a second electric control valve; the terminal water supply reserved interface and the terminal return water reserved interface are used to be connected to the end user side;

[0015] The three-way valve has a switching function between the air-cooled evaporator and the water-cooled evaporator; when the temperature of the hot water storage tank is within a first range value, the three-way valve switches to the water-cooled evaporator; when the temperature of the hot water storage tank is within a second range value, the three-way valve switches to the air-cooled evaporator; the maximum value of the second range value is less than the minimum value of the first range value.

[0016] In one embodiment, the solar heating device further comprises a first constant pressure water replenishment device and a second constant pressure water replenishment device;

[0017] The inlet of the first constant pressure water supply device is connected to one end of the water supply pipe, and the outlet is connected to the inlet of the first circulating water pump;

[0018] The inlet of the second constant-pressure water supply device is connected to one end of the water supply pipe, and the outlet is connected to the inlet of the second circulating water pump.

[0019] In one embodiment, a flow sensor is provided on the inlet pipe of the dual-source heat pump auxiliary heating system for detecting water shortage at the inlets of the low-temperature air source heat pump and the water source heat pump.

[0020] In one embodiment, the inlet and outlet of the first circulating water pump and the second circulating water pump are both provided with shock-absorbing soft connections; the outlets of the first circulating water pump and the second circulating water pump are both installed with check valves or silent one-way valves.

[0021] In one embodiment, the high-temperature water generated by the solar thermal collector panel enters the heat storage tank through a pipe; the water in the heat storage tank is added with ethylene glycol solution; the temperature of the water stored in the heat storage tank is 20 to 85 degrees.

[0022] In one embodiment, the solar heating device also includes a base; the base is a frame welded from channel steel or I-beam; the base is provided with fixing positions corresponding to the insulating shell, heat storage tank, heat exchanger, terminal supply system, dual heat source heat pump auxiliary heating system and control cabinet; each of the fixing positions is reinforced with a cross beam and is provided with a corresponding reserved installation hole.

[0023] In one embodiment, the heat-insulating shell is assembled and adopts a frame structure, which can be assembled arbitrarily and can be detachably installed on the base.

[0024] In one embodiment, the heat-insulating shell is assembled from finished color steel plates with a polyurethane foam structure added therein, and a sealed heat-insulating inspection door is provided on the back panel of the heat-insulating shell.

[0025] In one embodiment, the base is rectangular, and the base has reinforced beams on the sides of the narrow side frames. Two lifting ears are welded on the top beams of the reinforced beams on the two sides to balance the overall lifting weight of the equipment in the thermal insulation shell;

[0026] In addition, at the center of gravity of the solar heating device, two cross beams are welded longitudinally and flush with the bottom surface of the base, which is convenient for forklift loading and unloading.

[0027] The solar heating device adapted to ultra-low temperature environments in this application has the following beneficial effects:

[0028] 1. This application mainly uses solar collector panels to collect heat, supplemented by a dual-source heat pump auxiliary heating system to provide heat, which fully improves energy utilization efficiency and can effectively solve the problem of household heating in rural areas in high-altitude and cold areas in winter.

[0029] 2. Optimize the configuration and assembly of solar heating devices to form a clean energy heating station placed outdoors, which can simplify on-site construction and installation. Non-professionals can also quickly install it according to the instructions, which can greatly reduce installation costs, save installation time, and reduce material loss.

[0030] 3. It can configure standardized parts, and it is very easy to produce series products, which is conducive to improving production efficiency; according to the design configuration manual, the products are assembled and debugged in accordance with the specifications and qualified before leaving the factory, which is conducive to ensuring product quality.

[0031] 4. All equipment and accessories can be quickly disassembled, assembled and replaced, with convenient transportation and packaging and simple after-sales service.

[0032] 5. It realizes automatic control, 24-hour unmanned operation, fault alarm analysis, low operating cost, and also has a remote control interface, which is the optimal configuration for improving heating comfort for rural residents and saving energy, and is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 Schematic diagram of a solar heating device suitable for ultra-low temperature environments according to an embodiment of the present application;

[0035] Figure 2 The figure is a detailed flow chart of a solar heating device adapted to ultra-low temperature environments according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0038] Figure 1 This is a schematic diagram of the structure of a solar heating device adapted to ultra-low temperature environments according to an embodiment of the present application. Figure 1 The solar heating device adapted to ultra-low temperature environment includes a heat-insulating shell 1.

[0039] A solar collector panel 2 is mounted on the exterior of the insulating housing 1. The panel 2 is mounted on the top of the insulating housing 1, either horizontally or at an angle. It should be noted that the panel 2 is not limited to the top of the insulating housing 1 and can also be mounted on the side of the housing 1 or in other locations exposed to sunlight. Any location on the insulating housing 1 that can sufficiently increase the solar heat collection area can be used.

[0040] The heat-insulating housing 1 is internally provided with a hot water storage tank 4, a heat exchanger 7, a terminal supply system, a dual-source heat pump auxiliary heating system, and a control cabinet 20. The control cabinet 20 is communicatively connected to the hot water storage tank 4, the heat exchanger 7, the terminal supply system, and the dual-source heat pump auxiliary heating system.

[0041] The first inlet of the heat storage tank 4 is connected to the water supply pipe of the solar thermal panel 2, and the first outlet of the heat storage tank 4 is connected to the return pipe of the solar thermal panel 2 via the heat collection circulation pump 3. The terminal supply system draws water from the second outlet of the heat storage tank 4, exchanges heat through the heat exchanger 7, and then delivers water that meets the supply temperature to the end user by the first circulating water pump. The return water of the terminal supply system is connected to the inlet of the heat exchanger 7. The high-temperature water heated by the solar thermal panel 2 enters the heat storage tank 4 through the water supply pipe of the solar thermal panel 2. The water in the heat storage tank 4 absorbs heat and becomes high-temperature water. The high-temperature water transfers heat to the return pipe of the terminal supply system through the heat exchanger 7. The water in the return pipe of the terminal supply system absorbs heat and is delivered to the end user by the first circulating water pump.

[0042] The solar collector panels 2 primarily operate during the day. On cloudy days or at night, when the temperature of the water storage tank 4 drops after a short period of heat storage, the dual-source heat pump auxiliary heating system begins operating. The dual-source heat pump auxiliary heating system's outlet is connected to the user's water supply pipeline, and its inlet is connected to the user's return water pipeline. The dual-source heat pump auxiliary heating system activates when it detects insufficient water temperature at the user's end.

[0043] It can be seen from the above technical solution that the solar heating device in the embodiment of the present application mainly collects heat with the solar collector plate 2, supplemented by the dual-source heat pump auxiliary heating system. It collects solar energy during the day, and the water storage tank 4 stores heat for a short period of time on cloudy days or at night. The dual-source heat pump auxiliary heating system supplements heat, which fully improves the energy utilization efficiency and can effectively solve the household heating problem in rural areas in high-altitude and cold areas in winter.

[0044] Figure 2 This is a detailed flow chart of a solar heating device adapted to ultra-low temperature environments according to an embodiment of the present application. Figure 2The solar heating device suitable for ultra-low temperature environment includes an insulating shell 1, a solar collector panel 2, a heat collection circulation pump 3, a hot water storage tank 4, a first pressure tank 5, a first circulating water pump 6, a heat exchanger 7, a second pressure tank 8, a second circulating water pump 9, an air-cooled evaporator 10, a water-cooled evaporator 11, a condenser 12, an expansion valve 13, a filter 14, a three-way valve 15, a compressor 16 and a control cabinet 20.

[0045] The outlet of the solar thermal collector panel 2 is connected to one end of the water supply pipeline through the third electric control valve 40#, and the other end of the water supply pipeline is connected to the first inlet of the heat storage tank 4. The inlet of the solar thermal collector panel 2 is connected to the water outlet pipe of the heat collection circulation pump 3 through the fourth electric control valve 40, and the inlet of the heat collection circulation pump 3 is connected to the first outlet of the heat storage tank 4.

[0046] The dual-heat-source heat pump auxiliary heating system includes a compressor 16 , a condenser 12 , an expansion valve 13 and a filter 14 , a three-way valve 15 , an air-cooled evaporator 10 and a water-cooled evaporator 11 .

[0047] The compressor 16, condenser 12, expansion valve 13, filter 14, three-way valve 15, and air-cooled evaporator 10 form a low-temperature air-source heat pump. The compressor 16, condenser 12, expansion valve 13, filter 14, three-way valve 15, and water-cooled evaporator 11 form a water-source heat pump. The outlets of both the low-temperature air-source heat pump and the water-source heat pump are connected to one end of the water supply pipeline via a first electric control valve 17. The other end of the water supply pipeline is provided with a terminal water supply reserved interface 38. The inlets of the low-temperature air-source heat pump and the water-source heat pump are connected to the outlet of the second circulating water pump 9 via a ball valve 17# and communicate with the water outlet of the heat exchanger 7. The return pipe of the heat exchanger 7 is connected to the terminal return water reserved interface 39 via a second electric control valve 24#. The terminal water supply reserved interface and the terminal return water reserved interface are used to connect to the end user side. The second circulating water pump 9 can be installed on the water supply pipeline of the low-temperature air-source heat pump and the water-source heat pump, or on the return pipeline of the heat exchanger 7.

[0048] The three-way valve 15 has a switching function between the air-cooled evaporator 10 and the water-cooled evaporator 11; when the temperature of the hot water storage tank is in a first range value, the three-way valve 15 switches to the water-cooled evaporator 11; when the temperature of the hot water storage tank is in a second range value, the three-way valve 15 switches to the air-cooled evaporator 10; the maximum value of the second range value is less than the minimum value of the first range value.

[0049] Due to the need for antifreeze, the water storage tank stores ethylene glycol water solution. The high-temperature water generated by the solar thermal collector enters the water storage tank through a pipe. In one embodiment, the temperature of the stored water is 20 to 85 degrees. When the water temperature in the water storage tank 4 is between 50 and 85 degrees, the first circulating water pump 6 drives the heat exchanger 7 to perform heat exchange and then supplies it to the end user. When the water temperature in the water storage tank 4 is between 20 and 50 degrees, the second hot water circulating pump 9 supplies the water-cooled evaporator 11 in the water source heat pump, and the water source heat pump is started to supply it to the end user. When the water temperature in the water storage tank is less than 20 degrees, the second hot water circulating pump 9 supplies the low-temperature air source heat pump, and the low-temperature air source heat pump is started to supply it to the end user.

[0050] A filter 19 is installed at the inlet of the water source heat pump and the low-temperature air source heat pump, a first butterfly valve 31 and a first filter 30 are installed at the inlet of the heat collection circulation pump 3, a first check valve 29 is installed at the outlet of the heat collection circulation pump 3, and a first butterfly valve 28 is installed at the outlet of the first check valve 29; a fifth electric control valve 25 and a filter 41 are installed at the inlet of the first circulating water pump 6, a check valve 42 is installed at the outlet of the first circulating water pump 6, and a sixth electric control valve 22 and a seventh electric control valve 23 are installed at the outlet of the check valve 42; a second butterfly valve 34 and a second filter 35 are installed at the inlet of the second hot water circulation pump 9, a second check valve 36 is installed at the outlet of the second hot water circulation pump 9, and a second butterfly valve 37 is installed at the outlet of the second check valve 36.

[0051] In one embodiment, the solar heating device in the present application further includes a first constant pressure water replenishment device and a second constant pressure water replenishment device. The inlet of the first constant pressure water replenishment device is connected to one end of the water replenishment pipe, and the outlet is connected to the inlet of the first circulating water pump 6. The inlet of the second constant pressure water replenishment device is connected to one end of the water replenishment pipe, and the outlet is connected to the inlet of the second circulating water pump 9. In an operative manner, the constant pressure water replenishment device includes a pressure tank and a pressure controller. Among them, the first pressure tank 5 and the pressure controller serve as the first constant pressure water replenishment device, and the second pressure tank 8 and the pressure controller serve as the second constant pressure water replenishment device.

[0052] The first pressure tank 5 is connected to a water supply pipe with a reserved interface 32, the other end of which is connected to the inlet of the heat collection circulation pump 3. The second pressure tank 8 is connected to a water supply pipe with a reserved interface 33, the other end of which is connected to the inlet of the second circulating water pump 9. In this embodiment, the first and second pressure tanks 5, 8 can be diaphragm pressure tanks.

[0053] In one embodiment, the inlet and outlet of the first and second circulating water pumps are equipped with shock-absorbing flexible connectors. Check valves or silent one-way valves are installed at the outlets of both the first and second circulating water pumps. In a dual-source heat pump auxiliary heating system, the main inlet and outlet of both heat pumps are equipped with electric ball valves and metal flexible connectors, and filters are installed at the main inlet of both heat pumps.

[0054] In one embodiment, a flow sensor is provided on the inlet pipe of the dual-source heat pump auxiliary heating system. The water flow sensor is communicatively connected with the host control end of the low-temperature air source heat pump and the host control end of the water source heat pump. The flow of the inlet pipe is used to monitor whether there is a lack of water at the inlet of the heat pump host. In the state of lack of water, the heat pump host is easily damaged, so the heat pump host can be protected by the flow sensor.

[0055] In one embodiment, the solar heating device of the present application further includes a base 100. Base 100 is a frame constructed of welded channel steel or I-beams. Base 100 is provided with mounting locations corresponding to the insulated housing 1, the heat storage tank 4, the heat exchanger 7, the terminal supply system, the dual-source heat pump auxiliary heating system, and the control cabinet 20. Each mounting location is reinforced with a crossbeam and has corresponding reserved mounting holes to facilitate subsequent installation, maintenance, inspection, and replacement.

[0056] Shock absorbers are provided between the collector side circulation pump 3, the first circulation water pump 6, the second circulation water pump 9 and the base 100. Shock absorbers are provided between the compressor 16 and the air-cooled evaporator 10 in the dual-source heat pump auxiliary heating system and the base 100, which can minimize the conduction of noise and vibration during operation.

[0057] The insulated housing 1 is a prefabricated finished product, featuring a frame structure that allows for flexible assembly and removable installation on the base 100. Reinforced crossbeams are installed on the top and / or side frames of the insulated housing 1 to secure the solar collector panels 2. These crossbeams have corresponding mounting holes. The solar collector panels 2 are installed on-site. Bolts are used to assemble and disassemble the solar collector panels 2 from the insulated housing.

[0058] After the insulation shell is installed and fixed, the overall length and width dimensions maintain a space of 5 to 10 cm with the base 100 frame, and the unit height is controlled within the range of 2.2 meters, which is convenient for lifting and transportation.

[0059] The heat-insulating shell is assembled from a finished product of a color-coated steel plate with a polyurethane foam structure. A sealed heat-insulating inspection door is provided on the back panel of the heat-insulating shell. The inspection door is preferably located near the control cabinet 20 to facilitate operation and construction.

[0060] The rectangular base 100 features reinforced crossbeams on the narrow side frames. Two lifting lugs are welded to the top of each of the two side beams to balance the overall lifting weight of the equipment within the insulated enclosure. Two crossbeams are also welded longitudinally at the solar heating unit's center of gravity, flush with the bottom surface of the base 100, facilitating forklift loading and unloading.

[0061] In the control cabinet 20 of this embodiment, except for the reserved connection port for on-site installation at the main power supply terminal, all other power and control lines and switches leading to the heat pump main unit, heat collection circulation pump 3, first circulating water pump 6, and second circulating water pump 9 are fully installed and factory-tested. All piping components in the entire solar heating system are optimized and installed in accordance with HVAC and power electrical standards. The base 100 is designed according to actual transportation and lifting specifications.

[0062] All equipment and waterways in this application, including the solar collector panel 2, dual-source heat pump auxiliary heating system, heat collection circulation pump 3, first circulating water pump 6, second circulating water pump 9, first constant pressure tank 5, second constant pressure tank 8, hot water storage tank 4, heat exchanger 7, etc., can be quickly disassembled and connected through pipes, valves, slip knots or flanges, which is very convenient for subsequent replacement and maintenance.

[0063] This application also integrates the electrical control part of the unit, and configures a water shortage alarm sensor and a water flow sensor. The control cabinet 20 adopts a computer version and PLC operation mode, with a high degree of automation and simple operation, which can realize automatic operation and reserve a remote communication interface for remote operation and monitoring.

[0064] It can be seen from the above technical solution that this application mainly uses solar collector panels to collect heat, supplemented by dual-source heat pump auxiliary heating system to provide heat, which fully improves energy utilization efficiency and can effectively solve the problem of household heating in rural areas in high-altitude and cold areas in winter.

[0065] At the same time, this application also has the following characteristics:

[0066] 1. Optimize the configuration and assembly of solar heating devices to form a clean energy heating station placed outdoors, which can simplify on-site construction and installation. Non-professionals can also quickly install it according to the instructions, which can greatly reduce installation costs, save installation time, and reduce material loss.

[0067] 2. It can be configured with standardized parts, making it easy to manufacture series products, which is conducive to improving production efficiency; according to the design configuration manual, the products are assembled and debugged in accordance with the specifications and qualified before leaving the factory, which is conducive to ensuring product quality;

[0068] 3. All equipment and accessories can be quickly disassembled and replaced, easy to transport and pack, and simple after-sales service;

[0069] 4. It realizes automatic control, 24-hour unmanned operation, fault alarm analysis, low operating cost, and also has a remote control interface, which is the optimal configuration for improving heating comfort for rural residents and saving energy, and is conducive to promotion.

[0070] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A solar heating device suitable for ultra-low temperature environment, characterized in that: It includes a heat-insulating shell, a solar heat collecting panel is arranged on the outside of the heat-insulating shell, and a heat storage tank, a heat exchanger, a terminal supply system, a dual-heat source heat pump auxiliary heating system and a control cabinet are arranged inside the heat-insulating shell; The first inlet of the hot water storage tank is connected to the water supply pipe of the solar thermal collector panel, and the first outlet of the hot water storage tank is connected to the return pipe of the solar thermal collector panel via a heat collection circulation pump; The terminal supply system takes water from the second outlet of the hot water storage tank and heats it in the heat exchanger, and then the first circulating water pump delivers the water that meets the water supply temperature to the end user. The return water of the terminal supply system is connected to the inlet of the heat exchanger. The outlet of the dual-source heat pump auxiliary heating system is connected to the user's water supply pipeline, and the inlet is connected to the user's return water pipeline; when it is detected that the water temperature on the user side is insufficient, the dual-source heat pump auxiliary heating starts to operate; The control cabinet is communicatively connected with the hot water storage tank, the heat exchanger, the terminal supply system, and the dual-heat source heat pump auxiliary heating system; The dual-heat source heat pump auxiliary heating system includes a compressor, a condenser, an expansion valve and a filter, a three-way valve, an air-cooled evaporator and a water-cooled evaporator; The compressor, condenser, expansion valve and filter, three-way valve and air-cooled evaporator constitute a low-temperature air source heat pump; The compressor, condenser, expansion valve and filter, three-way valve and water-cooled evaporator constitute a water source heat pump; The outlets of the low-temperature air source heat pump and the water source heat pump are both connected to one end of the water supply pipeline through a first electric control valve, and the other end of the water supply pipeline is provided with a terminal water supply reserved interface; the inlets of the low-temperature air source heat pump and the water source heat pump are connected to the water outlet of the heat exchanger through a second circulating water pump, and the return pipe of the heat exchanger is connected to the terminal return water reserved interface through a second electric control valve; the terminal water supply reserved interface and the terminal return water reserved interface are used to be connected to the end user side; The three-way valve has a switching function of switching between the air-cooled evaporator and the water-cooled evaporator; when the temperature of the hot water storage tank is within a first range, the three-way valve switches to the water-cooled evaporator; When the temperature of the hot water storage tank is within a second range, the three-way valve switches to the air-cooled evaporator; The maximum value of the second range of values ​​is less than the minimum value of the first range of values; A flow sensor is provided on the inlet pipe of the dual-source heat pump auxiliary heating system for detecting water shortage at the inlets of the low-temperature air source heat pump and the water source heat pump; It also includes a first constant pressure water replenishing device and a second constant pressure water replenishing device; The inlet of the first constant pressure water supply device is connected to one end of the water supply pipe, and the outlet is connected to the inlet of the first circulating water pump; The inlet of the second constant-pressure water supply device is connected to one end of the water supply pipe, and the outlet is connected to the inlet of the second circulating water pump.

2. The solar heating device according to claim 1, characterized in that The inlet and outlet of the first circulating water pump and the second circulating water pump are both provided with shock-absorbing soft connections; the outlets of the first circulating water pump and the second circulating water pump are both installed with check valves or silent one-way valves.

3. The solar heating device according to claim 2, characterized in that: The high-temperature water generated by the solar heat collecting panel enters the heat storage tank through a pipeline; the water in the heat storage tank is added with ethylene glycol solution; the temperature of the water stored in the heat storage tank is 20 to 85 degrees.

4. The solar heating device according to claim 3, characterized in that: It also includes a base; the base is a frame welded from channel steel or I-beam; the base is provided with fixing positions corresponding to the thermal insulation shell, hot water storage tank, heat exchanger, terminal supply system, dual-source heat pump auxiliary heating system and control cabinet; each of the fixing positions is reinforced with a crossbeam and is provided with corresponding reserved installation holes.

5. The solar heating device according to claim 4, characterized in that: The heat-insulating shell is of assembled type and adopts a frame structure, which can be assembled arbitrarily and can be detachably installed on the base.

6. The solar heating device according to claim 4, characterized in that: The heat-insulating shell is assembled from finished color steel plates with a polyurethane foam structure added therein, and a sealed heat-insulating inspection door is provided on the back panel of the heat-insulating shell.

7. The solar heating device according to claim 4, characterized in that: The base is rectangular, and has reinforced beams on the sides of the narrow side frames. Two lifting lugs are welded on the top beams of the two side reinforcement beams to balance the overall lifting weight of the equipment in the thermal insulation shell; In addition, at the center of gravity of the solar heating device, two cross beams are welded longitudinally and flush with the bottom surface of the base, which is convenient for forklift loading and unloading.

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