Composite heat pump system

Abstract

The invention provides a composite heat pump system which comprises a heat pump unit system, a water source heat pump system and a ground source heat pump system. The heat pump unit system comprises a first heat exchanger and a second heat exchanger which are connected in series. The water source heat pump system comprises a pumping well, the first heat exchanger is provided with a first heat exchange flow path, and the flow direction of fluid in the first heat exchange flow path is opposite to that of refrigerant in the first heat exchanger; the ground source heat pump system comprises a buried pipe set, the buried pipe set is buried in soil, the pumping well is arranged in the middle of a pipe cluster of the buried pipe set, the second heat exchanger is provided with a second heat exchange flow path, and the flow direction of fluid in the second heat exchange flow path is opposite to the flow direction of refrigerant in the second heat exchanger. According to the change of the outdoor environment temperature, by adjusting operation of the water source heat pump and the ground source heat pump, two times of heat exchange can be conducted on a refrigerant, different weather conditions are adapted, forced flowing heat exchange with fluid in soil is promoted, and balance recovery of a temperature field in the soil is accelerated.

Description

Technical Field

[0001] The invention belongs to the technical field of heat pump systems, and in particular relates to a composite heat pump system. Background Art

[0002] The buried pipe geothermal heat pump system provides cold / heat sources for the heat pump unit through a closed system composed of a buried pipe heat exchanger and a ground source heat pump. It is driven by a small amount of electricity and uses geothermal energy for cooling and heating. It is a form of geothermal energy utilization that is green, environmentally friendly, efficient, and energy-saving, and is being used more and more widely. After the heat pump system has been running for a long time, heat will accumulate in the underground soil, the soil temperature will rise, and the heat exchange temperature difference between the soil and the buried pipe heat exchanger will gradually decrease, making it difficult to discharge the heat released by the buried pipe heat exchanger, resulting in reduced power of the heat pump unit or even shutdown. The soil thermal imbalance problem caused by this system with geothermal heat as the cold / heat source has gradually been exposed, limiting the long-term and efficient operation of the ground source heat pump system. Summary of the invention

[0003] The invention provides a composite heat pump system, which can solve the technical problem that heat is accumulated in underground soil after the heat pump system runs for a long time.

[0004] The present invention provides a composite heat pump system, which includes a heat pump unit system, a water source heat pump system and a ground source heat pump system;

[0005] The heat pump unit system comprises a first heat exchanger and a second heat exchanger arranged in series;

[0006] The water source heat pump system comprises a pumping well, the first heat exchanger has a first heat exchange flow path, the pumping well is used to provide fluid to the first heat exchange flow path, and the flow direction of the fluid in the first heat exchange flow path is opposite to the flow direction of the refrigerant in the first heat exchanger;

[0007] The ground source heat pump system includes an underground pipe group, which is buried in the soil. The pumping well is arranged in the middle of the pipe cluster of the underground pipe group. The second heat exchanger has a second heat exchange flow path. The buried pipe group is used to provide fluid to the second heat exchange flow path. The flow direction of the fluid in the second heat exchange flow path is opposite to the flow direction of the refrigerant in the second heat exchanger.

[0008] In some embodiments, the buried pipe group includes shallow buried pipes and deep buried pipes, the depth of the deep buried pipes buried in the soil is greater than the depth of the shallow buried pipes buried in the soil, the water outlet of the shallow buried pipes and the water outlet of the deep buried pipes are both connected to the water inlet of the second heat exchange flow path, and the water inlet of the shallow buried pipes and the water inlet of the deep buried pipes are both connected to the water outlet of the second heat exchange flow path.

[0009] In some embodiments, the water inlet of the second heat exchange flow path is provided with a second water inlet main pipe, the water outlet of the shallow buried pipe is connected to the second water inlet main pipe through a first water outlet branch pipe, and the first water outlet branch pipe is provided with a first solenoid valve; the water outlet of the deep buried pipe is connected to the second water inlet main pipe through a second water outlet branch pipe, and the second water outlet branch pipe is provided with a second solenoid valve;

[0010] The water outlet of the second heat exchange flow path is provided with a second water outlet main pipe, and the second water outlet main pipe is provided with a third solenoid valve; the water inlet of the shallow buried pipe is connected with the second water outlet main pipe through a first water inlet branch pipe, and the first water inlet branch pipe is provided with a first circulating water pump; the water inlet of the deep buried pipe is connected with the second water outlet main pipe through a second water inlet branch pipe, and the second water inlet branch pipe is provided with a second circulating water pump.

[0011] In some embodiments, the water source heat pump system also includes a shallow pumping pipeline and a deep pumping pipeline, one end of the shallow pumping pipeline is connected to the pumping well, and the other end of the shallow pumping pipeline is connected to the water inlet of the first heat exchange flow path; one end of the deep pumping pipeline is connected to the pumping well, and the other end of the deep pumping pipeline is connected to the water inlet of the first heat exchange flow path; the depth of the deep pumping pipeline extending into the pumping well is greater than the depth of the shallow pumping pipeline extending into the pumping well.

[0012] In some embodiments, the pumping well is vertically arranged, and a first water well inlet for fluid return is arranged at the top of the pumping well, and the top of the pumping well is arranged in the middle of the pipe cluster of the shallow buried pipes, and the shallow pumping pipeline is arranged corresponding to the shallow buried pipes, and the fluid in the pumping well exchanges heat with the fluid in the soil buried in the shallow buried pipes; the bottom end of the pumping well is arranged in the middle of the pipe cluster of the deep buried pipes, and a second water well inlet for fluid return is arranged at the top of the pumping well, and the deep pumping pipeline is arranged corresponding to the deep buried pipes, and the fluid in the pumping well exchanges heat with the fluid in the soil buried in the deep buried pipes.

[0013] In some embodiments, the water inlet of the first heat exchanger is provided with a first water inlet main pipe, the water outlet of the first heat exchanger is provided with a first water outlet main pipe, the shallow water pumping pipeline includes a first water pumping pipeline and a first water pumping pump, a fourth solenoid valve is provided on the first water pumping pipeline, the water inlet of the first water pumping pipeline extends into the water pumping well, the water outlet of the first water pumping pipeline is connected to the first water inlet main pipe, and the first water pumping pump is provided at the water inlet of the first water pumping pipeline;

[0014] The deep pumping pipeline includes a second pumping pipeline and a second pumping water pump, a fifth solenoid valve is arranged on the second pumping pipeline, a water inlet of the second pumping pipeline extends into the pumping well, a water outlet of the second pumping pipeline is connected to the first water inlet main pipe, the second pumping water pump is arranged at the water inlet of the second pumping pipeline, and the depth of the water inlet of the second pumping pipeline extending into the pumping well is greater than the depth of the water inlet of the first pumping pipeline extending into the pumping well;

[0015] The water source heat pump system further comprises a reinjection well, and an end of the first water outlet main pipe away from the first heat exchanger is connected to the reinjection well.

[0016] In some embodiments, a solar energy system is also included, which is used to provide fluid to the second heat exchange flow path. The water outlet of the solar energy system and the water outlet of the buried pipe group are both connected to the water inlet of the second heat exchange flow path, and the fluid in the buried pipe group is mixed with the fluid in the solar energy system and then flows into the water inlet of the second heat exchange flow path.

[0017] In some embodiments, a first three-way regulating valve is provided at the water inlet of the second heat exchange flow path, a first valve port of the first three-way regulating valve is connected to the water inlet of the second heat exchange flow path, a second valve port of the first three-way regulating valve is connected to the water outlet of the buried pipe group, and a third valve port of the first three-way regulating valve is connected to the water outlet of the solar energy system; the water inlet of the buried pipe group and the water inlet of the solar energy system are both connected to the water outlet of the second heat exchange flow path.

[0018] In some embodiments, the solar energy system includes a collector, a water tank, and a third circulating water pump. The collector is connected to the water tank, the water inlet of the water tank is connected to the water outlet of the second heat exchange flow path, and a sixth solenoid valve is arranged between the water inlet of the water tank and the water outlet of the second heat exchange flow path; the water outlet of the water tank is connected to the third valve port of the first three-way regulating valve, and the third circulating water pump and the seventh solenoid valve are arranged in sequence between the water outlet of the water tank and the third valve port of the first three-way regulating valve.

[0019] In some embodiments, the heat pump unit system includes a compressor, a third heat exchanger, a four-way valve, a second three-way regulating valve and a third three-way regulating valve, wherein the first valve port of the four-way valve is connected to the air inlet of the compressor, the second valve port of the four-way valve is connected to the air suction port of the compressor, the third valve port of the four-way valve is connected to the first valve port of the second three-way regulating valve, and the fourth valve port of the four-way valve is connected to the first inlet and outlet of the third heat exchanger;

[0020] The second valve port of the second three-way regulating valve is communicated with the inlet of the first heat exchanger, and the third valve port of the second three-way regulating valve is communicated with the second inlet and outlet of the third heat exchanger;

[0021] The first valve port of the third three-way regulating valve is connected to the outlet of the second heat exchanger, the third valve port of the four-way valve and the first valve port of the second three-way regulating valve are connected through a connecting pipeline, the second valve port of the third three-way regulating valve is connected to the connecting pipeline, and the third valve port of the third three-way regulating valve is connected to the second inlet and outlet of the third heat exchanger.

[0022] The heat pump system provided by the present invention has the following beneficial effects:

[0023] The composite heat pump system of the present invention combines the advantages of the heat pump unit system, the water source heat pump system and the ground source heat pump system. Through the first heat exchanger and the second heat exchanger arranged in series, and the cooperation with the pumping well and the underground pipe group, efficient heat exchange and energy utilization are achieved. Through two heat exchange processes, in the cooling mode, the composite heat pump system can complete the condensation of the refrigerant in the heat exchanger for a long time and maintain a certain degree of supercooling; in the heating mode, the composite heat pump system can provide enough heat for the evaporation of the refrigerant in the casing. In addition, due to the large temperature difference between the fluid and the refrigerant entering the heat exchanger, the composite heat pump system can more effectively exchange heat with the environment, thereby improving the overall temperature difference. The larger the heat exchange power, when the temperature difference becomes smaller, the heat exchange between the fluid and the refrigerant decreases, and the unit capacity will also decrease. For example, for heating, after the unit has been running for a long time, the temperature of the solution in the underground soil and the underground pipe gradually decreases, the heat exchange temperature difference in the heat exchanger becomes smaller, and the heat exchange of the heat exchanger decreases, resulting in a decrease in the heating capacity and energy efficiency ratio of the unit. The composite heat pump system can adapt to different climatic conditions by adjusting the operation of the water source and the ground source heat pump according to the change of the outdoor ambient temperature. Whether it is hot summer or cold winter, the heat exchange efficiency is improved by increasing the temperature difference between the fluid and the refrigerant. Since the composite heat pump system can more effectively utilize the heat in the environment, by combining different heat pump technologies, it can reduce the dependence on traditional energy sources, thereby saving energy consumption. In addition, the pumping well is set in the middle of the pipe cluster of the underground pipe group, so that the flow direction of the fluid extracted by the pumping well and the flow direction of the fluid in the underground pipe are crossed. The soil around the underground pipe group and the fluid in the pumping well can be used as a temperature buffer. The existence of the pumping well enables the system to flexibly adjust the intensity of heat exchange and increase the heat exchange. By pumping water through the pumping well, forced flow heat exchange with the soil is promoted, the temperature field in the soil is accelerated to restore the balance, and the problem of soil cold and heat accumulation is solved. When the underground pipe is enabled, when a stronger heat exchange is required, the heat exchange with the underground pipe group can be enhanced by increasing the flow of the pumping well. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 A schematic diagram of a compound heat pump system in cooling mode according to an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a composite heat pump system in heating according to an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the connection between a water source heat pump system and a ground source heat pump system according to an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of a ground source heat pump system according to an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of a water source heat pump system according to an embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of the connection between the ground source heat pump system and the solar energy system according to an embodiment of the present invention.

[0031] Figure: 1-heat pump system; 101-first heat exchanger; 102-second heat exchanger; 103-compressor; 104-third heat exchanger; 105-four-way valve; 106-second three-way regulating valve; 107-third three-way regulating valve; 108-first expansion valve; 109-second expansion valve; 2-water source heat pump system; 21-shallow water pumping pipeline; 211-first water pumping pipeline; 212-first water pumping pump; 213-fourth solenoid valve; 22-deep water pumping pipeline; 221-second water pumping pipeline; 222-second water pumping pump; 223-fifth solenoid valve; 201-first water inlet main pipe; 202-first water outlet main pipe; 203-recharge well; 2 04-pumping well; 3-ground source heat pump system; 31-buried pipe group; 301-shallow buried pipe; 302-deep buried pipe; 303-second water inlet main pipe; 304-first water outlet branch pipe; 305-first solenoid valve; 306-second water outlet branch pipe; 307-second solenoid valve; 308-second water outlet main pipe; 309-third solenoid valve; 310-first water inlet branch pipe; 311-first circulating water pump; 312-second water inlet branch pipe; 313-second circulating water pump; 4-solar energy system; 41-first three-way regulating valve; 401-collector; 402-water tank; 403-third circulating water pump; 404-sixth solenoid valve; 405-seventh solenoid valve. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0034] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0035] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0036] See also Figure 1 and Figure 2As shown, according to an embodiment of the present invention, a composite heat pump system is provided, which includes a heat pump unit system 1, a water source heat pump system 2 and a ground source heat pump system 3; the heat pump unit system 1 includes a first heat exchanger 101 and a second heat exchanger 102 arranged in series; the water source heat pump system 2 includes a pumping well 204, the first heat exchanger 101 has a first heat exchange flow path, the pumping well 204 is used to provide fluid to the first heat exchange flow path, and the flow direction of the fluid in the first heat exchange flow path is opposite to the flow direction of the refrigerant in the first heat exchanger 101; the ground source heat pump system 3 includes an underground pipe group 31, the underground pipe group 31 is buried in the soil, the pumping well 204 is arranged in the middle of the pipe cluster of the underground pipe group 31, the second heat exchanger 102 has a second heat exchange flow path, the underground pipe group 31 is used to provide fluid to the second heat exchange flow path, and the flow direction of the fluid in the second heat exchange flow path is opposite to the flow direction of the refrigerant in the second heat exchanger 102.

[0037] Specifically, when the heat pump system 1 operates in the cooling mode, a high-temperature and high-pressure refrigerant flows into the first heat exchanger 101 and the second heat exchanger 102. During the flow of the refrigerant, the first heat exchanger 101 and the second heat exchanger 102 release heat to the surrounding environment. As the heat is released, the temperature of the refrigerant gradually decreases. During this process, the temperature of the fluid in the pumping well 204 is lower than the outdoor ambient temperature. The pumping well 204 provides fluid to the first heat exchange flow path. During the flow of the fluid in the first heat exchange flow path, the fluid flows in the opposite direction to the refrigerant in the first heat exchanger 101, that is, the fluid in the pumping well 204 performs a heat exchange with the refrigerant in the first heat exchanger 101, so that the refrigerant flows out of the first heat exchanger 101 at a lower temperature. After the first heat exchange in the first heat exchanger 101, the refrigerant flows into the second heat exchange flow path. Since the fluid temperature in the buried pipe group 31 is also lower than the outdoor ambient temperature and slightly higher than the water temperature of the pumping well 204, the buried pipe group 31 provides fluid to the second heat exchange flow path. During the flow of the fluid in the second heat exchange flow path, the flow direction is opposite to that of the refrigerant. The refrigerant in the second flow path exchanges heat with the fluid, and the fluid absorbs the heat released by the refrigerant. The refrigerant has undergone two heat exchanges, so that the refrigerant flowing out of the second heat exchanger 102 is completely evaporated and maintains a certain degree of superheat, thereby preventing the unit from operating at a reduced frequency and the compressor from inhaling liquid.

[0038] Specifically, when the heat pump system 1 is running in the heating mode, usually in winter, the flow direction of the refrigerant in the first heat exchanger 101 and the second heat exchanger 102 does not change, but the low-temperature and low-pressure refrigerant flows into the first heat exchanger 101 and the second heat exchanger 102, and the temperature of the refrigerant gradually increases during the flow of the refrigerant. In this process, the temperature of the fluid in the pumping well 204 is higher than the outdoor ambient temperature. The pumping well 204 provides fluid to the first heat exchange flow path. During the flow of the fluid in the first heat exchange flow path, the flow direction is opposite to that of the refrigerant in the first heat exchanger 101, that is, the fluid in the pumping well 204 performs a heat exchange with the refrigerant in the first heat exchanger 101, so that the refrigerant flows out of the first heat exchanger 101 at a higher temperature. After the first heat exchange in the first heat exchanger 101, the refrigerant flows into the second heat exchange flow path. Since the fluid temperature in the buried pipe group 31 is also higher than the outdoor ambient temperature, the buried pipe group 31 provides fluid to the second heat exchange flow path. During the flow of the fluid in the second heat exchange flow path, the flow direction is opposite to that of the refrigerant. The refrigerant in the second flow path exchanges heat with the fluid, and the refrigerant absorbs the heat released by the fluid. The refrigerant has undergone two heat exchanges, so that the temperature of the refrigerant flowing out of the second heat exchanger 102 is higher.

[0039] In this embodiment, the water source heat pump system 2 is open, and uses surface water for circulating heat exchange. The ground source heat pump system 3 forms a closed circuit underground for heat exchange. The pipe can be water, a salt solution of a certain concentration, ethylene glycol solution and other refrigerants. The composite heat pump system combines the advantages of the heat pump unit system 1, the water source heat pump system 2 and the ground source heat pump system 3. Through the first heat exchanger 101 and the second heat exchanger 102 arranged in series, and the cooperation with the pumping well 204 and the buried pipe group 31, efficient heat exchange and energy utilization are achieved. Through two heat exchange processes, the composite heat pump system can more effectively extract heat from the environment or release heat, thereby improving the overall energy efficiency ratio, so that the composite heat pump system can ensure the condensation and evaporation of the refrigerant and a certain degree of supercooling / heating under higher load conditions. In addition, the greater the temperature difference between the fluid and the refrigerant entering the heat exchanger, the greater the heat exchange power. When the temperature difference becomes smaller, the heat exchange between the fluid and the refrigerant decreases, and the unit capacity will also decrease. For example, in heating, after the unit has been running for a long time, the temperature of the solution in the underground soil and the buried pipe gradually decreases, the heat exchange temperature difference in the heat exchanger becomes smaller, and the heat exchange of the heat exchanger decreases, resulting in a decrease in the unit's heating capacity (user-side heat exchange) and energy efficiency ratio (user-side heat exchange / unit operating power). This composite heat pump system can adapt to different climatic conditions by adjusting the operation of the water source and ground source heat pump according to changes in outdoor ambient temperature. Whether it is hot summer or cold winter, the heat exchange efficiency is improved by increasing the temperature difference between the fluid and the refrigerant. And because this composite heat pump system can more effectively utilize the heat in the environment, by combining different heat pump technologies, it can reduce dependence on traditional energy sources, thereby saving energy consumption.

[0040] In addition, since this embodiment is provided with both a water source heat pump system 2 and a ground source heat pump system 3, the open water source heat pump system 2 can directly extract groundwater, and the pumping well 204 is set in the middle of the pipe cluster of the buried pipe group 31, so that the flow direction of the fluid extracted by the pumping well 204 intersects with the flow direction of the fluid in the buried pipe group 31, and the soil around the buried pipe group 31 and the fluid in the pumping well 204 can be used as a temperature buffer zone. In the cooling mode, the buried pipe group 31 releases heat into the soil, and the water in the pumping well 204 can help absorb and store the heat; in the heating mode, the buried pipe group 31 extracts heat from the soil, and the pumping well 204 can release a certain amount of heat in the process of extracting the fluid, thereby assisting the buried pipe group 31 to provide more heat. Considering that the fluid in the pumping well 204 flows back from the soil around the pumping well 204 to the pumping well 204, the pumping well 204 is set in the middle of the underground pipe group 31, so that there is water in the soil around the ground pipe group 31. The existence of the pumping well 204 allows the system to flexibly adjust the intensity of heat exchange and increase the heat exchange. By pumping water through the pumping well 204, the fluid in the soil around the underground pipe group 31 is forced to flow and exchange heat, accelerate the restoration of the temperature field in the soil to balance, and solve the problem of soil heat accumulation. When the underground pipe is activated, when a stronger heat exchange is needed, the heat exchange with the underground pipe group 31 can be enhanced by increasing the flow of the pumping well 204. In addition, since the temperature change underground is smaller than that on the surface, the combination of the underground pipe group 31 and the pumping well 204 provides a relatively stable temperature source, which helps to improve the stability and reliability of the system.

[0041] It is worth noting that the ground source heat pump is generally drilled outdoors, while the water source heat pump is formed by drilling a well outdoors. The ground source heat pump does not need to consume water, which is more environmentally friendly than the water source heat pump that consumes water. The construction cost of the ground source heat pump is relatively high, while the construction cost of the water source heat pump is relatively low. When heating, the water or solution entering the first heat exchanger 101 will be cooled. Therefore, the refrigerant with a suitable freezing point temperature can be selected according to the temperature difference of the location to improve the reliability of the unit operation. This embodiment can realize three heat transfer modes: heat conduction, heat convection, and heat radiation by setting a water source heat pump system 2 and a ground source heat pump system 3. Heat conduction is the transfer of heat energy generated by the thermal motion of microscopic particles such as molecules, atoms and free electrons without relative displacement between the parts of an object. Thermal convection is the relative displacement between the parts of the fluid caused by the macroscopic movement of the fluid, and the heat transfer process caused by the mixing of cold and hot fluids. Convection is divided into natural convection (caused by the different densities of the cold and hot parts of the fluid) and forced convection (the flow of the fluid is caused by a water pump, a fan or other pressure difference). In this embodiment, the fluid in the buried pipe group 31 performs forced convection heat exchange with the inner wall of the buried pipe group 31, the inner wall of the buried pipe group 31 conducts heat conduction to the outer wall, and the outer wall of the buried pipe group 31 conducts heat conduction with the surrounding soil. When the pumping well 204 is not working, the outer wall of the buried pipe group 31 conducts natural convection heat exchange with the surrounding water. When the pumping well 204 is working, the outer wall of the buried pipe group 31 conducts forced convection heat exchange with the surrounding water. The forced convection heat exchange efficiency is higher.

[0042] See also Figure 3 and Figure 4 As shown, the buried pipe includes a shallow buried pipe 301 and a deep buried pipe 302. The depth of the deep buried pipe 302 buried in the soil is greater than the depth of the shallow buried pipe 301 buried in the soil. The water outlet of the shallow buried pipe 301 and the water outlet of the deep buried pipe 302 are both connected to the water inlet of the second heat exchange flow path, and the water inlet of the shallow buried pipe 301 and the water inlet of the deep buried pipe 302 are both connected to the water outlet of the second heat exchange flow path.

[0043] Specifically, the shallow buried pipe 301 and the deep buried pipe 302 are buried in the soil at different depths respectively. Since the soil temperature changes with increasing depth, the deep buried pipe 302 can be exposed to a more stable temperature, while the shallow buried pipe 301 is greatly affected by the change in surface temperature. That is, there is a temperature difference between the shallow buried pipe 301 and the deep buried pipe 302 themselves. This difference can be utilized by the heat pump system to select buried pipes of different depths or select two buried pipes at the same time according to different operating modes of the heat pump unit system 1 to improve the heat exchange efficiency. The heat exchange between the shallow buried pipe 301 and the deep buried pipe 302 aggravates the accumulation of cold and heat. Taking the cooling mode as an example, if the pumping well 204 does not work, the water around the shallow buried pipe 301 and the deep buried pipe 302 does not flow, and the shallow buried pipe 301 and the deep buried pipe 302 will release heat to the surrounding soil by heat conduction, which will cause the temperature around the shallow buried pipe 301 and the deep buried pipe 302 to be much higher than the temperature of the distant soil. If the pumping well 204 is working, considering that the fluid in the pumping well 204 is from the pumping well 2 04 flows back to the pumping well 204 from the surrounding soil. The pumping well 204 is set in the middle of the buried pipe group 31, so that there is still water in the soil around the ground pipe group 31. When the pumping well 204 is working, the water in the soil begins to flow, and the buried pipe conducts heat and heat convection with the surrounding water and soil. Convective heat transfer is more efficient than heat conduction, which will greatly reduce the temperature of the soil around the buried pipe, thereby slowing down the speed of cold and heat accumulation in the underground soil and accelerating the recovery of the underground temperature field, improving the economy and reliability of the long-term operation of the unit. In the heating mode, similarly, when the pumping well 204 is working, the water in the soil begins to flow, and the buried pipe conducts heat and heat convection with the surrounding water and soil. The shallow buried pipe 301 and the deep buried pipe 302 can provide heat sources of different temperatures. This setting helps to provide more heat in winter.

[0044] In this embodiment, the shallow buried pipe 301 and the deep buried pipe 302 provide greater flexibility, and the working mode of the heat pump can be adjusted according to the season and environmental conditions. For example, in winter, the composite heat pump system can rely more on the deep buried pipe 302 to provide a stable heat source; in summer, the composite heat pump system can use the shallow buried pipe 301 to release more heat. In addition, since the deep buried pipe 302 has a more stable soil temperature, it helps to maintain the long-term stability of the composite heat pump system and reduce the degradation of heat pump performance caused by soil temperature fluctuations.

[0045] As a specific implementation, the shallow buried pipe 301 and the deep buried pipe 302 form a circular ring, and the pumping well 204 is placed in the middle of the ring. In other embodiments, the pipe clusters of the shallow buried pipe 301 and the deep buried pipe 302 can also be arranged in an array with the pumping well 204 as the center.

[0046] See also Figure 3 and Figure 4 As shown, the water inlet of the second heat exchange flow path is provided with a second water inlet main pipe 303, the water outlet of the shallow buried pipe 301 is connected to the second water inlet main pipe 303 through a first water outlet branch pipe 304, and a first solenoid valve 305 is provided on the first water outlet branch pipe 304; the water outlet of the deep buried pipe 302 is connected to the second water inlet main pipe 303 through a second water outlet branch pipe 306, and a second solenoid valve 307 is provided on the second water outlet branch pipe 306; the water outlet of the second heat exchange flow path A second water outlet main pipe 308 is provided, and a third solenoid valve 309 is provided on the second water outlet main pipe 308; the water inlet of the shallow buried pipe 301 is connected with the second water outlet main pipe 308 through a first water inlet branch pipe 310, and a first circulating water pump 311 is provided on the first water inlet branch pipe 310; the water inlet of the deep buried pipe 302 is connected with the second water outlet main pipe 308 through a second water inlet branch pipe 312, and a second circulating water pump 313 is provided on the second water inlet branch pipe 312.

[0047] Specifically, when the heat pump unit system 1 operates in cooling mode or heating mode and needs to start the shallow buried pipe 301, the first solenoid valve 305 and the third solenoid valve 309 are opened, and the first circulating water pump 311 is started. Under the action of the first circulating water pump 311, the fluid flows out from the first water outlet branch pipe 304, flows into the second water inlet main pipe 303, and then flows into the second heat exchange flow path. After the fluid exchanges heat with the refrigerant, the fluid flows out from the second water outlet main pipe 308 and flows into the first water inlet branch pipe 310. Similarly, when the deep buried pipe 302 needs to be started, the second solenoid valve 307 and the third solenoid valve 309 are opened, and the second circulating water pump 313 is started. Under the action of the second circulating water pump 313, the fluid flows out from the second outlet branch pipe 306, flows into the second inlet main pipe 303, and then flows into the second heat exchange flow path. After the fluid exchanges heat with the refrigerant, the fluid flows out from the second outlet main pipe 308 and flows into the second inlet branch pipe 312. When the shallow buried pipe 301 and the deep buried pipe 302 are started at the same time, the first solenoid valve 305 to the third solenoid valve 309 are opened, the first circulating water pump 311 and the second circulating water pump 313 are started, and the fluids in the two branches converge and flow into the second inlet main pipe 303. After the fluid exchanges heat with the refrigerant, the second outlet main pipe 308 distributes the fluid to the two branches respectively.

[0048] In this embodiment, through the precise control of the electromagnetic valve and the circulating water pump, the flow of the shallow buried pipe 301 and the deep buried pipe 302 can be adjusted as needed to adapt to different heat load requirements, and the working mode of the shallow buried pipe 301 and the deep buried pipe 302 can be flexibly switched according to the ambient temperature and system requirements to achieve the best heat exchange effect. It is also possible to use geothermal resources at different depths to enable the system to achieve a higher energy efficiency ratio under different environmental conditions.

[0049] See also Figure 3 and Figure 4 As shown, the water source heat pump system 2 also includes a shallow pumping pipeline 21 and a deep pumping pipeline 22. One end of the shallow pumping pipeline 21 is connected to the pumping well 204, and the other end of the shallow pumping pipeline 21 is connected to the water inlet of the first heat exchange flow path; one end of the deep pumping pipeline 22 is connected to the pumping well 204, and the other end of the deep pumping pipeline 22 is connected to the water inlet of the first heat exchange flow path; the depth of the deep pumping pipeline 22 extending into the pumping well 204 is greater than the depth of the shallow pumping pipeline 21 extending into the pumping well 204.

[0050] Specifically, when the heat pump system 1 operates in cooling mode or heating mode and needs to extract shallow water from the pumping well 204, the shallow pumping pipeline 21 extracts the shallow fluid from the pumping well 204, and the fluid flows into the first heat exchange flow path. When deep water from the pumping well 204 needs to be extracted, the deep pumping pipeline 22 extracts the deep fluid from the pumping well 204, and the fluid flows into the first heat exchange flow path. In this embodiment, the two pipelines can be started to pump water separately or simultaneously.

[0051] In this embodiment, the deep pumping pipeline 22 and the shallow pumping pipeline 21 can respectively extract groundwater from different depths, which enables the composite heat pump system to selectively utilize groundwater resources at different levels as needed. This stratified pumping technology can achieve the same diameter of one hole and stratified pumping, and complete stratified pumping by selecting different depths in the well.

[0052] See also Figure 4 and Figure 5 As shown, the pumping well 204 is arranged vertically, and a first water well inlet for fluid return is arranged at the top of the pumping well 204, and the top of the pumping well 204 is arranged in the middle of the pipe cluster of the shallow buried pipe 301, and the shallow pumping pipeline 21 is arranged corresponding to the shallow buried pipe 301, and the fluid in the pumping well 204 exchanges heat with the fluid buried in the soil of the shallow buried pipe 301; the bottom end of the pumping well 204 is arranged in the middle of the pipe cluster of the deep buried pipe 302, and a second water well inlet for fluid return is arranged at the top of the pumping well 204, and the deep pumping pipeline 22 is arranged corresponding to the deep buried pipe 302, and the fluid in the pumping well 204 exchanges heat with the fluid buried in the soil of the deep buried pipe 302.

[0053] Specifically, when the shallow water pumping pipeline 21 extracts the shallow fluid in the pumping well 204, the shallow water pumping pipeline 21 sends the extracted fluid into the first heat exchange flow path, and the shallow buried pipe 301 also sends fluid into the second heat exchange flow path. After the refrigerant exchanges heat with the fluid in the first heat exchange flow path, it flows out of the first heat exchanger 101 and flows into the second heat exchange flow path. The refrigerant then exchanges heat with the fluid in the second heat exchange flow path for the second time and then flows out from the second heat exchanger 102. Similarly, when the deep water pumping pipeline 2 When extracting deep fluid from the pumping well 204, the deep pumping pipeline 22 delivers the extracted fluid to the first heat exchange flow path, and the deep buried pipe 302 also delivers fluid to the second heat exchange flow path. After the refrigerant exchanges heat with the fluid in the first heat exchange flow path, it flows out of the first heat exchanger 101 and flows into the second heat exchange flow path. The refrigerant then exchanges heat with the fluid in the second heat exchange flow path for the second time and then flows out of the second heat exchanger 102, that is, the shallow and deep pumping pipes and buried pipes work synchronously. In other embodiments, the shallow buried pipe 301, the deep buried pipe 302, the shallow pumping pipeline 21 and the deep pumping pipeline 22 can also be flexibly opened crosswise according to the heat exchange requirements.

[0054] In this embodiment, by setting the top and bottom ends of the pumping well 204 in the middle of the pipe clusters of the shallow buried pipe 301 and the deep buried pipe 302, respectively, it can be ensured that the fluid in the pumping well 204 can effectively exchange heat with the water in the soil buried in the shallow and deep buried pipes 302. This arrangement helps to improve the efficiency of the heat pump system in extracting or releasing heat from the soil. By setting shallow and deep pumping pipelines 22 in the pumping well 204 and connecting them to the buried pipe system at the corresponding depth, the thermal energy in the soil can be more effectively utilized. The soil at different depths has different temperature characteristics, so that the system can perform optimized heat exchange in different seasons and different climatic conditions. This shallow and deep arrangement enables the composite heat pump system to perform layered heat exchange, and can extract or release heat from the soil at different depths as needed. The corresponding layered extraction of the fluid in the pumping well 204 assists in improving the heat exchange effect, thereby improving the flexibility and adaptability of the heat pump system.

[0055] See also Figures 1 to 5As shown, the water inlet of the first heat exchanger 101 is provided with a first water inlet main pipe 201, the water outlet of the first heat exchanger 101 is provided with a first water outlet main pipe 202, the shallow water pumping pipeline 21 includes a first water pumping pipeline 211 and a first water pumping pump 212, the first water pumping pipeline 211 is provided with a fourth solenoid valve 213, the water inlet of the first water pumping pipeline 211 extends into the water pumping well 204, the water outlet of the first water pumping pipeline 211 is connected to the first water inlet main pipe 201, and the first water pumping pump 212 is arranged at the water inlet of the first water pumping pipeline 211; the deep water pumping pipeline 22 includes a second water pumping pipeline 221 and a second water pumping pump 212. Pump 222, a fifth solenoid valve 223 is arranged on the second pumping pipeline 221, the water inlet of the second pumping pipeline 221 extends into the pumping well 204, the water outlet of the second pumping pipeline 221 is connected with the first water inlet main pipe 201, the second pumping water pump 222 is arranged at the water inlet of the second pumping pipeline 221, and the depth of the water inlet of the second pumping pipeline 221 extending into the pumping well 204 is greater than the depth of the water inlet of the first pumping pipeline 211 extending into the pumping well 204; the water source heat pump system 2 also includes a recharge well 203, and the end of the first water outlet main pipe 202 away from the first heat exchanger 101 is connected to the recharge well 203.

[0056] Specifically, when the shallow pumping pipeline 21 needs to pump water, the fourth solenoid valve 213 is opened, the first pumping water pump 212 is started, and the fluid flows from the first pumping pipeline 211 into the first heat exchange flow path, and after heat exchange with the refrigerant, flows into the first water outlet main pipe 202, and then flows into the recharge well 203. When the deep pumping pipeline 22 needs to pump water, the fifth solenoid valve 223 is opened, the second pumping water pump 222 is started, and the fluid flows from the second pumping pipeline 221 into the first heat exchange flow path, and after heat exchange with the refrigerant, flows into the first water outlet main pipe 202, and then flows into the recharge well 203. The shallow pumping pipeline 21 and the deep pumping pipeline 22 can also pump water at the same time.

[0057] In this embodiment, by setting a solenoid valve on the water pumping pipeline, the flow direction of the fluid can be precisely controlled to ensure that the fluid flows to the first heat exchanger 101 when needed, or cuts off the flow when not needed, thereby improving the energy efficiency and control accuracy of the system. By setting a circulating water pump and a solenoid valve, the flow of the fluid can be quickly started or stopped when needed, increasing the safety and response speed of the system. By connecting the first water outlet main pipe 202 with the recharging well 203, it can be ensured that the fluid after heat exchange is effectively recharged into the groundwater, which helps to maintain the stability of the groundwater level and soil structure and reduce environmental impact.

[0058] As a specific implementation, the recharging well 203 is connected to the pumping well 204 through a pipeline, and the pumping well 204 is kept at a relatively long distance from the recharging well 203. The water in the recharging well 203 does not immediately flow back to the pumping well 204, but flows into the pumping well 204 after a certain period of heat consumption. A plurality of openable and closable filter holes are arranged on the wall of the pumping well 204. The first water well inlet and the second water well inlet in this embodiment are such filter holes. When the fluid in the recharging well 203 needs to flow back, the filter holes are opened, and the fluid flows into the pumping well 204 after being filtered. After the backflow is completed or when the fluid in the pumping well 204 is sufficient, the filter holes are closed.

[0059] As a specific implementation method, after the structures of the shallow pumping pipeline 21 and the deep pumping pipeline 22 are combined with the structures of the shallow buried pipe 301 and the deep buried pipe 302, each structure can work independently and collaboratively. Through the pumping pipelines and buried pipes of different depths, the system can use the temperature difference of the soil at different depths for heat exchange, thereby improving the energy efficiency ratio of the heat pump system. The deep buried pipe 302 is usually in a more stable temperature environment, while the shallow buried pipe 301 is greatly affected by the change of surface temperature. By reducing the heat accumulation in the soil through stratified pumping, more efficient heat energy extraction or release can be achieved, and according to the change of outdoor ambient temperature, by adjusting the flow of the shallow and deep pumping pipelines 22, the heat exchange process can be flexibly controlled through precise control and stratified heat exchange to adapt to different climatic conditions and heat load requirements.

[0060] See also Figures 1 to 6 As shown, it also includes a solar energy system 4, which is used to provide fluid to the second heat exchange flow path. The water outlet of the solar energy system 4 and the water outlet of the buried pipe group 31 are both connected to the water inlet of the second heat exchange flow path, and the fluid in the buried pipe group 31 is mixed with the fluid in the solar energy system 4 and then flows into the water inlet of the second heat exchange flow path.

[0061] Specifically, when the composite heat pump system is in heating mode, the solar energy system 4 collects solar energy during the day and converts it into thermal energy. This thermal energy can be directly used for heating or hot water supply, or it can be stored and used at night or on cloudy days. The buried pipe group 31 uses the relatively constant temperature of the underground soil for heat exchange. The solar energy system 4 is coupled with the ground source heat pump system 3. The solar energy system 4 can provide a higher temperature fluid to the second heat exchange flow path, mix the buried pipe group 31 and the fluid in the solar energy system 4 first, and then flow into the second heat exchange flow path after mixing.

[0062] In this embodiment, the excess energy collected by the solar energy system 4 in summer or during the day can be stored underground through the underground pipe group 31, and then used in winter or at night, so as to realize cross-season energy storage and improve energy utilization efficiency. The solar energy system 4 can provide a large amount of heat energy when the sunshine is sufficient, and the underground pipe group 31 can provide a stable supply of heat energy when the solar energy is insufficient. This complementarity can ensure that the system can operate stably under different weather conditions and save the operating energy consumption of the heat pump unit system 1. Secondly, the underground pipe group 31 provides a relatively stable temperature, which is not affected by the outside temperature, while the solar energy system 4 may fluctuate due to weather changes. The combination of the two can balance this fluctuation and improve the reliability and stability of the system.

[0063] See also Figure 4 and Figure 6 As shown, the water inlet of the second heat exchange flow path is provided with a first three-way regulating valve 41, the first valve port of the first three-way regulating valve 41 is connected to the water inlet of the second heat exchange flow path, the second valve port of the first three-way regulating valve 41 is connected to the water outlet of the buried pipe group 31, and the third valve port of the first three-way regulating valve 41 is connected to the water outlet of the solar energy system 4; the water inlet of the buried pipe group 31 and the water inlet of the solar energy system 4 are both connected to the water outlet of the second heat exchange flow path.

[0064] In this embodiment, when the composite heat pump system operates in heating mode, both the buried pipe group 31 and the solar energy system 4 need to provide fluid to the second heat exchange flow path, adjust the mixing ratio of the fluids on both sides, make the temperature difference of the solutions on both sides before mixing less than a certain value, enhance the heat exchange between the refrigerant and the second heat exchanger 102, and adjust the fluid ratio of the solar energy system 4 and the buried pipe system entering the second heat exchange flow path through the first three-way regulating valve 41. For example, after entering the night, the power of the solar energy system 4 is very low, and the temperature of the fluid provided by the solar energy system 4 also gradually decreases. The first three-way regulating valve 41 will gradually reduce the proportion of the solution entering the solar energy system 4 until it is 0. The composite heat pump system can continue to operate stably, maintain high efficiency even when the solar energy supply is insufficient, improve the economy of operation, and adjust the operation mode according to the load on the user side.

[0065] In this embodiment, the first three-way regulating valve 41 dynamically adjusts the connection between the water outlet of the underground pipe group 31 and the solar system 4 and the water inlet of the second heat exchange flow path by adjusting the opening of its three valve ports (the first valve port, the second valve port, and the third valve port). This adjustment mechanism enables the composite heat pump system to optimize the utilization efficiency of thermal energy according to real-time environmental conditions and energy availability. In this embodiment, by accurately controlling the flow direction and proportion of the fluid, the first three-way regulating valve 41 increases the flexibility of the system, enables the system to adapt to rapidly changing environmental conditions, improves the reliability of the system, and ensures the stable operation of the composite heat pump system under various conditions. The first three-way regulating valve 41 helps to reduce energy waste, and can adjust the heat supply according to actual needs to avoid excessive heating or cooling, thereby saving energy and reducing operating costs.

[0066] See also Figure 4 and Figure 6 As shown, the solar energy system 4 includes a collector 401, a water tank 402, and a third circulating water pump 403. The collector 401 is connected to the water tank 402, the water inlet of the water tank 402 is connected to the water outlet of the second heat exchange flow path, and a sixth solenoid valve 404 is arranged between the water inlet of the water tank 402 and the water outlet of the second heat exchange flow path; the water outlet of the water tank 402 is connected to the third valve port of the first three-way regulating valve 41, and the third circulating water pump 403 and the seventh solenoid valve 405 are arranged in sequence between the water outlet of the water tank 402 and the third valve port of the first three-way regulating valve 41.

[0067] Specifically, the solar collector 401 is responsible for collecting solar energy. The collector 401 can be a flat plate type, a vacuum tube type or other types of solar energy collection equipment. The collector 401 converts solar energy into thermal energy. The collected thermal energy is transferred to the water tank 402. In this process, the collector 401 and the water tank 402 are connected by a pipeline, and the thermal energy is transferred to the water in the water tank 402 by heat conduction or heat convection. The water tank 402 is used to store the thermal energy collected by the collector 401. The water tank 402 is provided with good thermal insulation performance to reduce heat loss and ensure that the thermal energy can be stored for a long time. The sixth solenoid valve 404 controls the outlet water of the second heat exchange flow path to flow to the water inlet of the water tank 402. The seventh solenoid valve 405 controls the flow direction of the fluid between the water outlet of the water tank 402 and the third valve port of the first three-way regulating valve 41 to ensure that the fluid flows to the first three-way regulating valve 41 when needed. During the day or in clear weather, the solar collector 401 collects solar energy and heats the water in the water tank 402. The third circulating water pump 403 delivers hot water to the first three-way regulating valve 41, where it mixes with the fluid provided by the buried pipe group 31 and flows into the second heat exchange flow path. At night or when the solar energy is insufficient, the temperature of the fluid provided by the solar system 4 decreases, and the first three-way regulating valve 41 gradually reduces the proportion of the fluid entering the solar system 4 until it may be zero. At this time, the system relies more on the thermal energy provided by the buried pipe group 31.

[0068] In this embodiment, the energy collected by the solar energy system 4 can be stored in the water tank 402 and used for heating needs at night or on cloudy days to slow down the accumulation of cold and heat underground. When operating in heating mode, the solar energy system 4 is used first.

[0069] As a specific implementation, the composite heat pump system of this embodiment includes a heat pump unit system 1, a water source heat pump system 2, a ground source heat pump system 3 and a solar energy system 4, and the underground pipe group 31 includes a shallow underground pipe 301 and a deep underground pipe 302, and the depth of the deep underground pipe 302 buried in the soil is greater than the depth of the shallow underground pipe 301 buried in the soil. The water source heat pump system 2 also includes a shallow pumping pipeline 21 and a deep pumping pipeline 22, and the depth of the deep pumping pipeline 22 extending into the pumping well 204 is greater than the depth of the shallow pumping pipeline 21 extending into the pumping well 204. The pumping well 204 is vertically arranged, the top of the pumping well 204 is arranged in the middle of the pipe cluster of the shallow buried pipe 301, the shallow pumping pipeline 21 is arranged corresponding to the shallow buried pipe 301, and the fluid in the pumping well 204 exchanges heat with the soil buried in the shallow buried pipe 301; the bottom of the pumping well 204 is arranged in the middle of the pipe cluster of the deep buried pipe 302, the deep pumping pipeline 22 is arranged corresponding to the deep buried pipe 302, and the fluid in the pumping well 204 exchanges heat with the soil buried in the deep buried pipe 302. The solar energy system 4 is used to provide fluid to the second heat exchange flow path, the water outlet of the solar energy system 4 and the water outlet of the buried pipe group 31 are both connected to the water inlet of the second heat exchange flow path, and the fluid in the buried pipe group 31 is mixed with the fluid in the solar energy system 4 and then flows into the water inlet of the second heat exchange flow path.

[0070] Specifically, when the shallow water pumping pipeline 21 extracts the shallow fluid in the pumping well 204, the shallow water pumping pipeline 21 sends the extracted fluid into the first heat exchange flow path, and the shallow buried pipe 301 also sends fluid into the second heat exchange flow path. After the refrigerant exchanges heat with the fluid in the first heat exchange flow path, it flows out of the first heat exchanger 101 and flows into the second heat exchange flow path. The refrigerant then exchanges heat with the fluid in the second heat exchange flow path for the second time and then flows out from the second heat exchanger 102. Similarly, when the deep pumping pipeline 22 extracts deep fluid from the pumping well 204, the deep pumping pipeline 22 sends the extracted fluid into the first heat exchange flow path. At this time, the deep buried pipe 302 also sends fluid into the second heat exchange flow path. After the refrigerant exchanges heat with the fluid in the first heat exchange flow path, it flows out of the first heat exchanger 101 and flows into the second heat exchange flow path. The refrigerant then exchanges heat with the fluid in the second heat exchange flow path for a second time and then flows out from the second heat exchanger 102. When the heat pump unit system 1 operates in the heating mode, the solar energy system 4 also provides fluid to the second heat exchange flow path at the same time. The fluid provided by the deep buried pipe 302 and the fluid provided by the shallow buried pipe 301 are mixed before flowing into the first three-way regulating valve 41, and then the first three-way regulating valve 41 adjusts the mixing ratio of the buried pipe and the solar energy system 4, and finally flows into the second heat exchange flow path. After the heat exchange in the second heat exchange flow path is completed, the fluid flows back to the buried pipe.

[0071] In this embodiment, the buried pipe can also meet the heat exchange demand, but it will gradually decrease. The operation of the unit will gradually increase the cold and heat accumulation underground. The addition of the solar energy system 4 and the pumping well 204 can slow down the speed of cold and heat accumulation underground, and improve the reliability and economy of the long-term operation of the unit. The water source heat pump system 2 and the ground source heat pump system 3 can provide stable heat energy under different environmental conditions, and the addition of the solar energy system 4 can provide additional heat energy when the sunshine is sufficient, which enhances the environmental adaptability of the system. The integration of the solar energy system 4 can provide free heat during the period of abundant solar energy, reduce the consumption of electricity or other energy, and thus reduce the operating cost of the system. In addition, the temperature of the ground source heat pump system 3 is relatively stable throughout the year, and the solar energy system 4 can provide stable heat energy during the day. This combination can ensure that the system can operate stably in different seasons and different weather conditions, enhance the energy self-sufficiency of the system, reduce the operating cost, and improve the economic benefits of the system.

[0072] See also Figure 1 and Figure 2As shown, the heat pump system 1 includes a compressor 103, a third heat exchanger 104, a four-way valve 105, a second three-way regulating valve 106 and a third three-way regulating valve 107, a first valve port of the four-way valve 105 is connected to an air inlet of the compressor 103, a second valve port of the four-way valve 105 is connected to an air suction port of the compressor 103, a third valve port of the four-way valve 105 is connected to a first valve port of the second three-way regulating valve 106, a fourth valve port of the four-way valve 105 is connected to a first inlet and outlet of the third heat exchanger 104; the second three-way regulating valve 105 is connected to a first inlet and outlet of the third heat exchanger 104; The second valve port of the four-way valve 106 is connected to the first heat exchanger 101, and the third valve port of the second three-way regulating valve 106 is connected to the second inlet and outlet of the third heat exchanger 104; the first valve port of the third three-way regulating valve 107 is connected to the outlet of the second heat exchanger 102, the third valve port of the four-way valve 105 and the first valve port of the second three-way regulating valve 106 are connected through a connecting pipeline, the second valve port of the third three-way regulating valve 107 is connected to the connecting pipeline, and the third valve port of the third three-way regulating valve 107 is connected to the second inlet and outlet of the third heat exchanger 104.

[0073] Specifically, during cooling, the high-temperature and high-pressure refrigerant is discharged from the compressor 103 and enters the four-way valve 105. The high-temperature and high-pressure refrigerant flows into the first heat exchanger 101 and the second heat exchanger 102 in sequence through the second three-way regulating valve 106 and is condensed into liquid. It passes through the third three-way regulating valve 107 and enters the first expansion valve 108 for throttling. The throttled refrigerant enters the third heat exchanger 104 for heat exchange. After heat exchange, it becomes a low-temperature and low-pressure gaseous refrigerant and returns to the compressor 103. During heating, the high-temperature and high-pressure refrigerant is discharged from the compressor 103 through the four-way valve 105. The high-temperature and high-pressure refrigerant enters the third heat exchanger 104 to release heat and is condensed into liquid. The liquid refrigerant passes through the second three-way regulating valve 106 and enters the second expansion valve 109 for throttling. The throttled refrigerant passes through the first heat exchanger 101 and the second heat exchanger 102 in sequence for heat exchange. After heat exchange, the low-temperature and low-pressure refrigerant returns to the compressor 103 through the third three-way regulating valve 107 and the four-way valve 105. During the cooling and heating process, the water source heat pump system 2, the ground source heat pump system 3 and the solar energy system 4 are flexibly operated so that the fluid flows into the first heat exchange flow path and the second heat exchange flow path respectively to exchange heat with the refrigerant.

[0074] In this embodiment, the second three-way regulating valve 106 and the third three-way regulating valve 107 coordinate the flow direction of the refrigerant in the system to ensure that the refrigerant effectively exchanges heat in each heat exchanger. The stable operation of the heat pump unit system 1 provides a reliable heat supply for the entire composite heat pump system, ensuring the continuity and stability of the system.

[0075] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A composite heat pump system, characterized in that: include: Heat pump system (1), water source heat pump system (2) and ground source heat pump system (3); The heat pump unit system (1) comprises a first heat exchanger (101) and a second heat exchanger (102) which are arranged in series; The water source heat pump system (2) comprises a pumping well (204), the first heat exchanger (101) has a first heat exchange flow path, the pumping well (204) is used to provide fluid to the first heat exchange flow path, and the flow direction of the fluid in the first heat exchange flow path is opposite to the flow direction of the refrigerant in the first heat exchanger (101); The ground source heat pump system (3) comprises a buried pipe group (31), the buried pipe group (31) is buried in the soil, the pumping well (204) is arranged in the middle of the pipe cluster of the buried pipe group (31), the second heat exchanger (102) has a second heat exchange flow path, the buried pipe group (31) is used to provide fluid to the second heat exchange flow path, and the flow direction of the fluid in the second heat exchange flow path is opposite to the flow direction of the refrigerant in the second heat exchanger (102).

2. The compound heat pump system according to claim 1, characterized in that: The buried pipe group (31) comprises a shallow buried pipe (301) and a deep buried pipe (302); the depth of the deep buried pipe (302) buried in the soil is greater than the depth of the shallow buried pipe (301) buried in the soil; the water outlet of the shallow buried pipe (301) and the water outlet of the deep buried pipe (302) are both connected to the water inlet of the second heat exchange flow path; and the water inlet of the shallow buried pipe (301) and the water inlet of the deep buried pipe (302) are both connected to the water outlet of the second heat exchange flow path.

3. The compound heat pump system according to claim 2, characterized in that: The water inlet of the second heat exchange flow path is provided with a second water inlet main pipe (303); the water outlet of the shallow buried pipe (301) is connected to the second water inlet main pipe (303) through a first water outlet branch pipe (304), and a first solenoid valve (305) is provided on the first water outlet branch pipe (304); the water outlet of the deep buried pipe (302) is connected to the second water inlet main pipe (303) through a second water outlet branch pipe (306), and a second solenoid valve (307) is provided on the second water outlet branch pipe (306); The water outlet of the second heat exchange flow path is provided with a second water outlet main pipe (308), and the second water outlet main pipe (308) is provided with a third solenoid valve (309); the water inlet of the shallow buried pipe (301) is connected to the second water outlet main pipe (308) through a first water inlet branch pipe (310), and the first water inlet branch pipe (310) is provided with a first circulating water pump (311); the water inlet of the deep buried pipe (302) is connected to the second water outlet main pipe (308) through a second water inlet branch pipe (312), and the second water inlet branch pipe (312) is provided with a second circulating water pump (313).

4. The compound heat pump system according to claim 2, characterized in that: The water source heat pump system (2) further comprises a shallow water pumping pipeline (21) and a deep water pumping pipeline (22); one end of the shallow water pumping pipeline (21) is connected to the water pumping well (204), and the other end of the shallow water pumping pipeline (21) is connected to the water inlet of the first heat exchange flow path; one end of the deep water pumping pipeline (22) is connected to the water pumping well (204), and the other end of the deep water pumping pipeline (22) is connected to the water inlet of the first heat exchange flow path; the depth to which the deep water pumping pipeline (22) extends into the water pumping well (204) is greater than the depth to which the shallow water pumping pipeline (21) extends into the water pumping well (204).

5. The compound heat pump system according to claim 4, characterized in that: The pumping well (204) is arranged vertically, and a first water well inlet for fluid return is arranged at the top of the pumping well (204). The top of the pumping well (204) is arranged in the middle of the pipe cluster of the shallow buried pipe (301), and the shallow pumping pipeline (21) is arranged corresponding to the shallow buried pipe (301). The fluid in the pumping well (204) exchanges heat with the fluid in the soil buried in the shallow buried pipe (301); the bottom of the pumping well (204) is arranged in the middle of the pipe cluster of the deep buried pipe (302), and a second water well inlet for fluid return is arranged at the top of the pumping well (204). The deep pumping pipeline (22) is arranged corresponding to the deep buried pipe (302), and the fluid in the pumping well (204) exchanges heat with the fluid in the soil buried in the deep buried pipe (302).

6. The compound heat pump system according to claim 4, characterized in that: The water inlet of the first heat exchanger (101) is provided with a first water inlet main pipe (201), the water outlet of the first heat exchanger (101) is provided with a first water outlet main pipe (202), the shallow water pumping pipeline (21) comprises a first water pumping pipeline (211) and a first water pumping pump (212), the first water pumping pipeline (211) is provided with a fourth solenoid valve (213), the water inlet of the first water pumping pipeline (211) extends into the water pumping well (204), the water outlet of the first water pumping pipeline (211) is connected to the first water inlet main pipe (201), and the first water pumping pump (212) is arranged at the water inlet of the first water pumping pipeline (211); The deep pumping pipeline (22) comprises a second pumping pipeline (221) and a second pumping water pump (222); a fifth solenoid valve (223) is arranged on the second pumping pipeline (221); a water inlet of the second pumping pipeline (221) extends into the pumping well (204); a water outlet of the second pumping pipeline (221) is connected to the first water inlet main pipe (201); the second pumping water pump (222) is arranged at the water inlet of the second pumping pipeline (221); and the depth to which the water inlet of the second pumping pipeline (221) extends into the pumping well (204) is greater than the depth to which the water inlet of the first pumping pipeline (211) extends into the pumping well (204); The water source heat pump system (2) further comprises a reinjection well (203), and an end of the first water outlet main pipe (202) away from the first heat exchanger (101) is connected to the reinjection well (203).

7. The compound heat pump system according to claim 1, characterized in that: It also includes a solar energy system (4), the solar energy system (4) being used to provide fluid to the second heat exchange flow path, the water outlet of the solar energy system (4) and the water outlet of the buried pipe group (31) being both connected to the water inlet of the second heat exchange flow path, and the fluid in the buried pipe group (31) is mixed with the fluid in the solar energy system (4) and then flows into the water inlet of the second heat exchange flow path.

8. The compound heat pump system according to claim 7, characterized in that: The water inlet of the second heat exchange flow path is provided with a first three-way regulating valve (41); the first valve port of the first three-way regulating valve (41) is connected to the water inlet of the second heat exchange flow path; the second valve port of the first three-way regulating valve (41) is connected to the water outlet of the buried pipe group (31); and the third valve port of the first three-way regulating valve (41) is connected to the water outlet of the solar energy system (4); the water inlet of the buried pipe group (31) and the water inlet of the solar energy system (4) are both connected to the water outlet of the second heat exchange flow path.

9. The compound heat pump system according to claim 8, characterized in that: The solar energy system (4) comprises a heat collector (401), a water tank (402), and a third circulating water pump (403); the heat collector (401) is connected to the water tank (402); the water inlet of the water tank (402) is connected to the water outlet of the second heat exchange flow path, and a sixth solenoid valve (404) is arranged between the water inlet of the water tank (402) and the water outlet of the second heat exchange flow path; the water outlet of the water tank (402) is connected to the third valve port of the first three-way regulating valve (41), and the third circulating water pump (403) and a seventh solenoid valve (405) are arranged in sequence between the water outlet of the water tank (402) and the third valve port of the first three-way regulating valve (41).

10. The compound heat pump system according to any one of claims 1 to 9, characterized in that: The heat pump unit system (1) comprises a compressor (103), a third heat exchanger (104), a four-way valve (105), a second three-way regulating valve (106) and a third three-way regulating valve (107); a first valve port of the four-way valve (105) is connected to an air inlet of the compressor (103); a second valve port of the four-way valve (105) is connected to an air suction port of the compressor (103); a third valve port of the four-way valve (105) is connected to a first valve port of the second three-way regulating valve (106); and a fourth valve port of the four-way valve (105) is connected to a first inlet and outlet of the third heat exchanger (104); The second valve port of the second three-way regulating valve (106) is in communication with the inlet of the first heat exchanger (101), and the third valve port of the second three-way regulating valve (106) is in communication with the second inlet and outlet of the third heat exchanger (104); The first valve port of the third three-way regulating valve (107) is connected to the outlet of the second heat exchanger (102), the third valve port of the four-way valve (105) and the first valve port of the second three-way regulating valve (106) are connected via a connecting pipeline, the second valve port of the third three-way regulating valve (107) is connected to the connecting pipeline, and the third valve port of the third three-way regulating valve (107) is connected to the second inlet and outlet of the third heat exchanger (104).

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