A composite heat pump system

Abstract

This invention provides a composite heat pump system, comprising a heat pump unit system, a water source heat pump system, and a ground source heat pump system. The heat pump unit system includes a first heat exchanger and a second heat exchanger connected in series. The water source heat pump system includes a pumping well. The first heat exchanger has a first heat exchange flow path, where the fluid flow direction is opposite to the refrigerant flow direction in the first heat exchanger. The ground source heat pump system includes a buried pipe assembly buried in the soil. The pumping well is located in the middle of the pipe assembly. The second heat exchanger has a second heat exchange flow path, where the fluid flow direction is opposite to the refrigerant flow direction in the second heat exchanger. This invention can adapt to different climatic conditions by adjusting the operation of the water source and ground source heat pumps according to changes in outdoor ambient temperature, enabling two heat exchanges for the refrigerant, promoting forced flow heat exchange with the fluid in the soil, and accelerating the restoration of temperature equilibrium in the soil.

Description

Technical Field

[0001] This invention belongs to the field of heat pump system technology, and specifically relates to a composite heat pump system. Background Technology

[0002] Ground source heat pump systems, which use buried pipe heat exchangers and ground source heat pumps to form a closed system, provide a cold / heat source for heat pump units. They are driven by a small amount of electricity and utilize geothermal energy for cooling and heating. They are characterized by being green, environmentally friendly, efficient, and energy-saving, and are being used more and more widely. However, 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 temperature difference between the soil and the buried pipe heat exchanger will gradually decrease. This makes it difficult for the heat released by the buried pipe heat exchanger to be dissipated, resulting in a reduction in the capacity of the heat pump unit or even shutdown. This soil thermal imbalance caused by the system using geothermal energy as a cold / heat source is gradually being exposed, limiting the long-term efficient operation of ground source heat pump systems. Summary of the Invention

[0003] This invention provides a composite heat pump system that can solve the technical problem of heat accumulation in underground soil after long-term operation of heat pump systems.

[0004] This 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 includes a first heat exchanger and a second heat exchanger arranged in series.

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

[0007] The ground source heat pump system includes a buried pipe assembly buried in the soil. The pumping well is located in the middle of the pipe cluster of the buried pipe assembly. The second heat exchanger has a second heat exchange flow path. The buried pipe assembly is used to supply fluid to the second heat exchange flow path. The fluid flow direction in the second heat exchange flow path is opposite to the refrigerant flow direction in the second heat exchanger.

[0008] In some embodiments, the buried pipe assembly includes a shallow buried pipe and a deep buried pipe, wherein the deep buried pipe is buried at a greater depth than the shallow buried pipe, and the outlets of both the shallow and deep buried pipes are connected to the inlet of the second heat exchange flow path, and the inlets of both the shallow and deep buried pipes are connected to the outlet of the second heat exchange flow path.

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

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

[0011] In some embodiments, the water source heat pump system further 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 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 inlet of the first heat exchange flow path. The depth to which the deep pumping pipeline extends into the pumping well is greater than the depth to which the shallow pumping pipeline extends into the pumping well.

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

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

[0014] The deep water pumping pipeline includes a second water pumping pipeline and a second water pump. A fifth solenoid valve is installed on the second water pumping pipeline. The inlet of the second water pumping pipeline extends into the water pumping well. The outlet of the second water pumping pipeline is connected to the first main water inlet pipe. The second water pumping pump is located at the inlet of the second water pumping pipeline. The depth to which the inlet of the second water pumping pipeline extends into the water pumping well is greater than the depth to which the inlet of the first water pumping pipeline extends into the water pumping well.

[0015] The water source heat pump system also includes a reinjection well, and the end of the first 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 provides fluid to the second heat exchange flow path. The outlet of the solar energy system and the outlet of the buried pipe assembly are both connected to the inlet of the second heat exchange flow path, and the fluid in the buried pipe assembly mixes with the fluid in the solar energy system before flowing into the inlet of the second heat exchange flow path.

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

[0018] In some embodiments, the solar energy system includes a solar collector, a water tank, and a third circulating water pump. The solar collector is connected to the water tank, the inlet of the water tank is connected to the outlet of the second heat exchange flow path, and a sixth solenoid valve is provided between the inlet of the water tank and the outlet of the second heat exchange flow path. The 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 a seventh solenoid valve are sequentially arranged between the 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. 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 connected to the inlet of the first heat exchanger, and the third valve port of the second three-way regulating valve is connected to 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 pipe. The second valve port of the third three-way regulating valve is connected to the connecting pipe. 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 this invention has the following beneficial effects:

[0023] The composite heat pump system of this invention combines the advantages of heat pump unit systems, water source heat pump systems, and ground source heat pump systems. Through a series-connected first and second heat exchanger, and in conjunction with a pumping well and underground pipe assembly, it achieves highly efficient heat exchange and energy utilization. Through two heat exchange processes, in cooling mode, the composite heat pump system can maintain a certain degree of subcooling and condensation of the refrigerant within the heat exchanger for an extended period. In heating mode, the composite heat pump system can provide sufficient heat for the evaporation of the refrigerant within the casing. Furthermore, due to the large temperature difference between the fluid and refrigerant entering the heat exchanger, the composite heat pump system can more effectively exchange heat with the environment, thereby increasing the overall temperature difference and heat exchange power. Conversely, when the temperature difference decreases, the heat exchange between the fluid and refrigerant decreases, and the unit's capacity also decreases. For example, in heating mode, after prolonged operation, the temperature of the solution in the underground soil and underground pipes gradually decreases, the temperature difference within the heat exchanger decreases, and the heat exchanger's heat exchange capacity decreases, leading to a decline in the unit's heating capacity and energy efficiency ratio. This composite heat pump system can adapt to different climatic conditions by adjusting the operation of the water source and ground source heat pumps according to changes in outdoor ambient temperature, whether in hot summers or cold winters. It improves heat exchange efficiency by increasing the temperature difference between the fluid and refrigerant. Furthermore, because this composite heat pump system can more effectively utilize ambient heat and combines different heat pump technologies, it can reduce dependence on traditional energy sources, thereby saving energy consumption. Moreover, placing the pumping well in the middle of the buried pipe cluster allows the flow direction of the fluid drawn from the pumping well to intersect with the flow direction of the fluid in the buried pipes. The soil surrounding the buried pipe cluster and the fluid in the pumping well act as a temperature buffer. The presence of the pumping well allows the system to flexibly adjust the intensity of heat exchange, increasing the amount of heat exchanged. Pumping water from the well promotes forced flow heat exchange with the soil, accelerating the restoration of temperature equilibrium in the soil and solving the problem of soil heat accumulation. When the buried pipes are in operation, the flow rate of the pumping well can be increased to enhance heat exchange with the buried pipe cluster when stronger heat exchange is required. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the composite heat pump system during cooling according to an embodiment of the present invention;

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

[0027] Figure 3 This is a schematic diagram illustrating 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 This is a schematic diagram of a ground source heat pump system according to an embodiment of the present invention;

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

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

[0031] Attached Figures: 1-Heat pump unit 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 pumping pipeline; 211-First pumping pipeline; 212-First pumping pump; 213-Fourth solenoid valve; 22-Deep pumping pipeline; 221-Second pumping pipeline; 222-Second pumping pump; 223-Fifth solenoid valve; 201-First inlet main pipe; 202-First outlet main pipe; 203-Recharge well; 2 04-Pumping well; 3-Ground source heat pump system; 31-Buried pipe assembly; 301-Shallow buried pipe; 302-Deep buried pipe; 303-Second main inlet pipe; 304-First branch outlet pipe; 305-First solenoid valve; 306-Second branch outlet pipe; 307-Second solenoid valve; 308-Second main outlet pipe; 309-Third solenoid valve; 310-First branch inlet pipe; 311-First circulating water pump; 312-Second branch inlet pipe; 313-Second circulating water pump; 4-Solar 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 Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

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

[0035] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0036] See also Figure 1 and Figure 2As shown in the 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 a buried pipe assembly 31, the buried pipe assembly 31 is buried in the soil, the pumping well 204 is located in the middle of the pipe bundle of the buried pipe assembly 31, the second heat exchanger 102 has a second heat exchange flow path, the buried pipe assembly 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 unit system 1 operates in cooling mode, high-temperature and high-pressure refrigerant flows into the first heat exchanger 101 and the second heat exchanger 102. During the refrigerant flow, the first heat exchanger 101 and the second heat exchanger 102 release heat to the surrounding environment. As heat is released, the temperature of the refrigerant gradually decreases. During this process, the fluid temperature 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, it flows in the opposite direction to the refrigerant in the first heat exchanger 101. That is, the fluid in the pumping well 204 and the refrigerant in the first heat exchanger 101 undergo a heat exchange, causing the refrigerant to flow out of the first heat exchanger 101 at a lower temperature. After the refrigerant undergoes the first heat exchange in the first heat exchanger 101, it flows into the second heat exchange path. Since the fluid temperature in the buried pipe assembly 31 is also lower than the outdoor ambient temperature and slightly higher than the water temperature in the pumping well 204, the buried pipe assembly 31 provides fluid to the second heat exchange path. During the flow of the fluid in the second heat exchange path, the flow direction is opposite to that of the refrigerant. The refrigerant in the second path exchanges heat with the fluid, and the fluid absorbs the heat released by the refrigerant. The refrigerant undergoes two heat exchanges, which makes the refrigerant flowing out of the second heat exchanger 102 completely evaporate and maintain a certain degree of superheat, preventing the unit from operating at reduced frequency and the compressor from sucking in liquid.

[0038] Specifically, when the heat pump unit system 1 operates in heating mode, typically in winter, the flow direction of the refrigerant in the first heat exchanger 101 and the second heat exchanger 102 does not change. Only the low-temperature, low-pressure refrigerant flows into the first and second heat exchangers 101 and 102, and its temperature gradually increases during this flow. During this process, the fluid temperature in the pumping well 204 is higher than the outdoor ambient temperature. The pumping well 204 supplies fluid to the first heat exchange path. As the fluid flows through the first heat exchange path, its flow direction is opposite to that of the refrigerant in the first heat exchanger 101. In other words, the fluid in the pumping well 204 undergoes a heat exchange with the refrigerant in the first heat exchanger 101, causing the refrigerant to exit the first heat exchanger 101 at a higher temperature. After the refrigerant undergoes the first heat exchange in the first heat exchanger 101, it flows into the second heat exchange path. Since the fluid temperature in the buried pipe assembly 31 is also higher than the outdoor ambient temperature, the buried pipe assembly 31 provides fluid to the second heat exchange path. During the flow of the fluid in the second heat exchange path, the flow direction is opposite to that of the refrigerant. The refrigerant in the second path exchanges heat with the fluid, and the refrigerant absorbs the heat released by the fluid. The refrigerant undergoes two heat exchanges, resulting in a higher temperature of the refrigerant flowing out of the second heat exchanger 102.

[0039] In this embodiment, the water source heat pump system 2 is open, utilizing surface water for circulating heat exchange, while the ground source heat pump system 3 forms a closed loop underground for heat exchange. The pipes can contain refrigerants such as water, a salt solution of a certain concentration, or ethylene glycol solution. 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 series connection of the first heat exchanger 101 and the second heat exchanger 102, and their coordination with the pumping well 204 and the buried pipe assembly 31, it achieves efficient heat exchange and energy utilization. Through two heat exchange processes, the composite heat pump system can more effectively extract or release heat from the environment, thereby improving the overall energy efficiency ratio. This allows the composite heat pump system to ensure the condensation and evaporation of the refrigerant and a certain degree of subcooling / heating under high load conditions. Furthermore, the greater the temperature difference between the fluid and refrigerant entering the heat exchanger, the greater the heat exchange power. When the temperature difference decreases, the heat exchange between the fluid and refrigerant decreases, and the unit's capacity also decreases. For example, in heating, after the unit has been running for a long time, the temperature of the solution in the underground soil and buried pipes gradually decreases, the heat exchange temperature difference within the heat exchanger decreases, and the heat exchanger's heat exchange capacity decreases, leading to a decline in the unit's heating capacity (user-side heat exchange) and energy efficiency ratio (user-side heat exchange / unit operating power). This hybrid heat pump system can adapt to different climatic conditions by adjusting the operation of the water source and ground source heat pumps according to changes in outdoor ambient temperature, whether in hot summers or cold winters. By increasing the temperature difference between the fluid and refrigerant, heat exchange efficiency is improved. Moreover, because this hybrid heat pump system can more effectively utilize heat from the environment, by combining different heat pump technologies, it can reduce dependence on traditional energy sources, thereby saving energy consumption.

[0040] Furthermore, since this embodiment includes 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. The pumping well 204 is placed 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. The soil around the buried pipe group 31 and the fluid in the pumping well 204 can act as a temperature buffer. In 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 this heat. In heating mode, the buried pipe group 31 extracts heat from the soil, and the pumping well 204 can release a certain amount of heat during the process of extracting fluid, thereby assisting the buried pipe group 31 in providing more heat. Considering that the fluid in pumping well 204 flows back from the surrounding soil, placing pumping well 204 in the middle of the buried pipe assembly 31 ensures that the soil around the surface pipe assembly 31 also contains water. The presence of pumping well 204 allows the system to flexibly adjust the intensity of heat exchange and increase the amount of heat exchanged. By pumping water from pumping well 204, forced flow and heat exchange with the fluid in the surrounding soil of the buried pipe assembly 31 are promoted, accelerating the restoration of temperature equilibrium in the soil and solving the problem of soil heat accumulation. When the buried pipes are in operation, the flow rate of pumping well 204 can be increased to enhance heat exchange with the buried pipe assembly 31 when stronger heat exchange is required. Moreover, since the temperature change underground is smaller than that on the surface, the combination of buried pipe assembly 31 and 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 ground source heat pumps are generally formed by drilling holes outdoors, while water source heat pumps are formed by drilling wells outdoors. Ground source heat pumps do not consume water, making them more environmentally friendly compared to water source heat pumps. Furthermore, the construction cost of ground source heat pumps is relatively high, while the construction cost of water source heat pumps is relatively low. During heating, the water or solution entering the first heat exchanger 101 is cooled, allowing for the selection of a refrigerant with a suitable freezing point temperature based on the local temperature difference, thus improving the reliability of the unit's operation. This embodiment, by setting up a water source heat pump system 2 and a ground source heat pump system 3, can achieve three heat transfer modes: heat conduction, heat convection, and heat radiation. 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 different parts of a fluid caused by the macroscopic movement of the fluid, and the heat transfer process resulting from the mixing of hot and cold fluids. Convection is divided into natural convection (caused by the difference in density between the hot and cold parts of the fluid) and forced convection (the flow of the fluid is caused by a pump, fan, or other pressure difference). In this embodiment, the fluid in the buried pipe assembly 31 undergoes forced convection heat exchange with the inner wall of the buried pipe assembly 31, heat is conducted from the inner wall to the outer wall of the buried pipe assembly 31, and heat is conducted between the outer wall of the buried pipe assembly 31 and the surrounding soil. When the pumping well 204 is not working, the outer wall of the buried pipe assembly 31 undergoes natural convection heat exchange with the surrounding water. When the pumping well 204 is working, the outer wall of the buried pipe assembly 31 undergoes forced convection heat exchange with the surrounding water. Forced convection heat exchange is more efficient.

[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 deep buried pipe 302 is buried at a greater depth than the shallow buried pipe 301. The outlets of both the shallow buried pipe 301 and the deep buried pipe 302 are connected to the inlet of the second heat exchange path. The inlets of both the shallow buried pipe 301 and the deep buried pipe 302 are connected to the outlet of the second heat exchange path.

[0043] Specifically, shallow buried pipe 301 and deep buried pipe 302 are buried in the soil at different depths. Since the soil temperature changes with increasing depth, the deep buried pipe 302 can reach a more stable temperature, while the shallow buried pipe 301 is more affected by changes in surface temperature. In other words, there is a temperature difference between the shallow buried pipe 301 and the deep buried pipe 302. This difference can be utilized by the heat pump system to select buried pipes of different depths or to select two buried pipes at the same time according to different operating modes of the heat pump unit system 1, so as to improve heat exchange efficiency. The heat exchange between shallow buried pipe 301 and deep buried pipe 302 exacerbates the accumulation of hot and cold air. Taking the cooling mode as an example, if the pumping well 204 is not working, the water around the shallow buried pipe 301 and deep buried pipe 302 will not flow. The shallow buried pipe 301 and deep buried pipe 302 will release heat to the surrounding soil through heat conduction, causing the temperature around the shallow buried pipe 301 and deep buried pipe 302 to be much higher than the temperature of the soil further away. If the pumping well 204 is working, considering that the fluid in the pumping well 204 comes from the pumping well 202... Water flows back from the surrounding soil to the pumping well 204. The pumping well 204 is positioned in the middle of the buried pipe assembly 31, ensuring that the soil around the surface pipe assembly 31 also contains water. When the pumping well 204 operates, the water in the soil begins to flow, and the buried pipe interacts with the surrounding water and soil through heat conduction and convection. Convection heat transfer is more efficient than heat conduction, significantly reducing the soil temperature around the buried pipe. This slows down the rate of cold and hot accumulation in the underground soil and accelerates the recovery of the underground temperature field, improving the long-term economic efficiency and reliability of the unit. Similarly, in heating mode, when the pumping well 204 operates, the water in the soil begins to flow, and the buried pipe interacts with the surrounding water and soil through heat conduction and convection. The shallow buried pipe 301 and the deep buried pipe 302 can provide heat sources at different temperatures, which 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, allowing the heat pump's operating mode to be adjusted according to 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 utilize the shallow buried pipe 301 to release more heat. Moreover, because the deep buried pipe 302 has a more stable soil temperature, it helps maintain the long-term stability of the composite heat pump system and reduces the performance degradation of the heat pump caused by soil temperature fluctuations.

[0045] In one specific implementation, the shallow buried pipe 301 and the deep buried pipe 302 form an encircling ring, with the pumping well 204 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 inlet of the second heat exchange flow path is provided with a second inlet main pipe 303. The outlet of the shallow buried pipe 301 is connected to the second inlet main pipe 303 through a first outlet branch pipe 304, and a first solenoid valve 305 is provided on the first outlet branch pipe 304. The outlet of the deep buried pipe 302 is connected to the second inlet main pipe 303 through a second outlet branch pipe 306, and a second solenoid valve 307 is provided on the second outlet branch pipe 306. The outlet of the second heat exchange flow path... A second main outlet pipe 308 is provided, and a third solenoid valve 309 is installed on the second main outlet pipe 308. The inlet of the shallow buried pipe 301 is connected to the second main outlet pipe 308 through a first inlet branch pipe 310, and a first circulating water pump 311 is installed on the first inlet branch pipe 310. The inlet of the deep buried pipe 302 is connected to the second main outlet pipe 308 through a second inlet branch pipe 312, and a second circulating water pump 313 is installed on the second inlet branch pipe 312.

[0047] Specifically, when the heat pump unit system 1 is running in cooling or heating mode and the shallow buried pipe 301 needs to be started, the first solenoid valve 305 and the third solenoid valve 309 are opened, the first circulating water pump 311 is started, and under the action of the first circulating water pump 311, the fluid flows out from the first outlet branch pipe 304 and into the second inlet main pipe 303, and then 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 into the first 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 open, and the second circulating water pump 313 starts. Under the action of the second circulating water pump 313, the fluid flows out from the second outlet branch pipe 306 and into the second inlet main pipe 303, and then 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 into the second inlet branch pipe 312. When the shallow buried pipe 301 and the deep buried pipe 302 are started simultaneously, the first solenoid valve 305 to the third solenoid valve 309 open, and the first circulating water pump 311 and the second circulating water pump 313 start. The fluid in the two branch pipes merges and flows 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 branch pipes respectively.

[0048] In this embodiment, through precise control of the solenoid valve and circulating water pump, the flow rates of the shallow buried pipe 301 and the deep buried pipe 302 can be adjusted as needed to adapt to different heat load requirements. The operating modes of the shallow buried pipe 301 and the deep buried pipe 302 can be flexibly switched according to ambient temperature and system requirements to achieve optimal heat exchange. Furthermore, by utilizing geothermal resources at different depths, the system can achieve a higher energy efficiency ratio under various environmental conditions.

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

[0050] Specifically, when the heat pump unit system 1 is operating in cooling or heating mode and needs to extract shallow water from the pumping well 204, the shallow pumping pipe 21 extracts the shallow fluid from the pumping well 204, and the fluid flows into the first heat exchange path. When it is necessary to extract deep water from the pumping well 204, the deep pumping pipe 22 extracts the deep fluid from the pumping well 204, and the fluid flows into the first heat exchange path. In this embodiment, both pipes can be started individually or simultaneously for pumping.

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

[0052] See also Figure 4 and Figure 5 As shown, the pumping well 204 is vertically arranged, and the top of the pumping well 204 is provided with a first water well inlet for fluid return. The top of the pumping well 204 is located in the middle of the pipe cluster of the shallow buried pipe 301. The shallow pumping pipeline 21 is arranged correspondingly to the shallow buried pipe 301. The fluid in the pumping well 204 exchanges heat with the fluid buried in the soil of the shallow buried pipe 301. The bottom of the pumping well 204 is located in the middle of the pipe cluster of the deep buried pipe 302. The top of the pumping well 204 is provided with a second water well inlet for fluid return. The deep pumping pipeline 22 is arranged correspondingly to the deep buried pipe 302. 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 pumping pipeline 21 draws shallow fluid from the pumping well 204, the shallow pumping pipeline 21 sends the drawn fluid into the first heat exchange flow path. At the same time, 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 into the second heat exchange flow path. The refrigerant then exchanges heat a second time with the fluid in the second heat exchange flow path and then flows out from the second heat exchanger 102. Similarly, when the deep pumping pipeline 2... 2. When extracting deep fluid from the pumping well 204, the deep pumping pipeline 22 sends the extracted fluid into the first heat exchange flow path. At the same time, the deep underground 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 into the second heat exchange flow path. The refrigerant then exchanges heat with the fluid in the second heat exchange flow path a second time and then flows out from the second heat exchanger 102. That is, the shallow and deep pumping pipelines and underground pipes work synchronously. In other embodiments, the shallow underground pipe 301, deep underground pipe 302, shallow pumping pipeline 21, and deep pumping pipeline 22 can also be flexibly and alternately opened according to heat exchange requirements.

[0054] In this embodiment, by placing the top and bottom ends of the pumping well 204 between the shallow buried pipe 301 and the deep buried pipe 302 respectively, effective heat exchange between the fluid in the pumping well 204 and the water in the soil buried in the shallow and deep buried pipes 302 can be ensured. This arrangement helps improve the efficiency of the heat pump system in extracting or releasing heat from the soil. By setting shallow and deep pumping pipes 22 in the pumping well 204 and connecting them to the buried pipe system at the corresponding depths, the thermal energy in the soil can be utilized more effectively. Soil at different depths has different temperature characteristics, allowing the system to optimize heat exchange under different seasons and climatic conditions. This shallow and deep arrangement enables the composite heat pump system to perform stratified heat exchange, extracting or releasing heat from soil at different depths as needed. Correspondingly, the fluid in the pumping well 204 is extracted in layers to further improve the heat exchange effect, thereby enhancing the flexibility and adaptability of the heat pump system.

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

[0056] Specifically, when water needs to be pumped from the shallow pumping pipeline 21, the fourth solenoid valve 213 opens, the first pumping pump 212 starts, and the fluid flows from the first pumping pipeline 211 into the first heat exchange path, exchanges heat with the refrigerant, flows into the first outlet main pipe 202, and then flows into the reinjection well 203. When water needs to be pumped from the deep pumping pipeline 22, the fifth solenoid valve 223 opens, the second pumping pump 222 starts, and the fluid flows from the second pumping pipeline 221 into the first heat exchange path, exchanges heat with the refrigerant, flows into the first outlet main pipe 202, and then flows into the reinjection well 203. The shallow pumping pipeline 21 and the deep pumping pipeline 22 can also pump water simultaneously.

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

[0058] In one specific implementation, the reinjection well 203 is connected to the pumping well 204 via a pipeline. The pumping well 204 and the reinjection well 203 are kept at a considerable distance. The water in the reinjection well 203 does not immediately flow back into the pumping well 204; instead, it flows into the pumping well 204 after a certain period of heat dissipation. The pumping well 204 has multiple openable and closable filter holes on its wall. In this embodiment, the inlet of the first well and the inlet of the second well are these filter holes. When fluid in the reinjection well 203 needs to flow back, the filter holes open, and the fluid flows into the pumping well 204 after filtration. After the backflow is completed or when there is sufficient fluid in the pumping well 204, the filter holes are closed.

[0059] As a specific implementation method, by combining the structures of shallow pumping pipe 21 and deep pumping pipe 22 with the structures of shallow buried pipe 301 and deep buried pipe 302, each structure can work independently or collaboratively. Through pumping pipes and buried pipes at different depths, the system can utilize the temperature differences in the soil at different depths for heat exchange, thereby improving the energy efficiency ratio of the heat pump system. Deep buried pipe 302 is typically in a more stable temperature environment, while shallow buried pipe 301 is more affected by changes in surface temperature. By reducing heat accumulation in the soil through stratified pumping, more efficient heat extraction or release can be achieved. Furthermore, by adjusting the flow rate of shallow and deep pumping pipes 22 according to changes in outdoor ambient temperature, 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 outlet of the solar energy system 4 and the outlet of the buried pipe assembly 31 are both connected to the inlet of the second heat exchange flow path. The fluid in the buried pipe assembly 31 is mixed with the fluid in the solar energy system 4 and then flows into the 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 heat energy. This heat energy can be used directly for heating or hot water supply, or it can be stored for use at night or on cloudy days. Meanwhile, the buried pipe assembly 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, mixing the fluid in the buried pipe assembly 31 with the fluid in the solar energy system 4 before it flows into the second heat exchange flow path.

[0062] In this embodiment, excess energy collected by the solar energy system 4 during summer or daytime can be stored underground through the buried pipe assembly 31 and then used in winter or at night, achieving cross-seasonal energy storage and improving energy utilization efficiency. The solar energy system 4 can provide a large amount of heat energy when there is sufficient sunshine, while the buried pipe assembly 31 can provide a stable heat energy supply when there is insufficient solar energy. This complementarity can ensure that the system can operate stably under different weather conditions, saving the operating energy consumption of the heat pump unit system 1. Secondly, the buried pipe assembly 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 inlet of the second heat exchange flow path is equipped with a first three-way regulating valve 41. The first valve port of the first three-way regulating valve 41 is connected to the inlet of the second heat exchange flow path, the second valve port of the first three-way regulating valve 41 is connected to the outlet of the buried pipe assembly 31, and the third valve port of the first three-way regulating valve 41 is connected to the outlet of the solar energy system 4. The inlet of the buried pipe assembly 31 and the inlet of the solar energy system 4 are both connected to the outlet of the second heat exchange flow path.

[0064] In this embodiment, when the composite heat pump system is operating in heating mode, both the buried pipe assembly 31 and the solar energy system 4 supply fluid to the second heat exchange flow path. The mixing ratio of the fluids on both sides is adjusted so that the temperature difference between the solutions on both sides before mixing is less than a certain value, thereby enhancing the heat exchange between the refrigerant and the second heat exchanger 102. The ratio of the fluids entering the second heat exchange flow path from the solar energy system 4 and the buried pipe system is adjusted by the first three-way regulating valve 41. For example, when the solar energy system 4 has very low power at night, 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 reaches 0. The composite heat pump system can continue to operate stably and maintain high efficiency even when the solar energy supply is insufficient, thereby improving the economic efficiency of operation. The operating mode is adjusted 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 outlet of the buried pipe assembly 31 and the solar energy system 4 and the inlet of the second heat exchange flow path by adjusting the opening of its three valve ports (first valve port, second valve port, and 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. By precisely controlling the flow direction and ratio of the fluid, the first three-way regulating valve 41 increases the flexibility of the system, enabling it to adapt to rapidly changing environmental conditions, improving the reliability of the system, ensuring the stable operation of the composite heat pump system under various conditions, and helping to reduce energy waste. The first three-way regulating valve 41 can adjust the heat energy supply according to actual needs, avoiding overheating 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 inlet of the water tank 402 is connected to the outlet of the second heat exchange flow path, and a sixth solenoid valve 404 is provided between the inlet of the water tank 402 and the outlet of the second heat exchange flow path. The outlet of the water tank 402 is connected to the third valve port of the first three-way regulating valve 41. The third circulating water pump 403 and the seventh solenoid valve 405 are sequentially provided between the 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, converting solar energy into heat energy. The collected heat energy is transferred to the water tank 402. During this process, the collector 401 and the water tank 402 are connected by a pipe, and the heat energy is transferred to the water in the water tank 402 through heat conduction or heat convection. The water tank 402 is used to store the heat energy collected by the collector 401. The water tank 402 is equipped with good insulation performance to reduce heat loss and ensure that the heat energy can be stored for a long time. The sixth solenoid valve 404 controls the flow of water from the outlet of the second heat exchange path to the inlet of the water tank 402, and the seventh solenoid valve 405 controls the flow direction of fluid between the outlet of the water tank 402 and the third port of the first three-way regulating valve 41, ensuring that the fluid flows to the first three-way regulating valve 41 when needed. During the day or in sunny weather, the solar collector 401 collects solar energy and heats the water in the water tank 402. The third circulating water pump 403 delivers the hot water to the first three-way regulating valve 41, where it mixes with the fluid provided by the underground pipe assembly 31 and flows into the second heat exchange 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 fluid entering the solar system 4 until it may be zero. At this time, the system relies more on the heat energy provided by the underground pipe assembly 31.

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

[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. The buried pipe assembly 31 includes a shallow buried pipe 301 and a deep buried pipe 302, with the deep buried pipe 302 buried at a greater depth than the shallow buried pipe 301. The water source heat pump system 2 also includes a shallow pumping pipe 21 and a deep pumping pipe 22, with the deep pumping pipe 22 extending into the pumping well 204 at a greater depth than the shallow pumping pipe 21 extending into the pumping well 204. The pumping well 204 is vertically installed, with its top end positioned in the middle of the shallow buried pipe 301. The shallow pumping pipe 21 is correspondingly installed with 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 end of the pumping well 204 is positioned in the middle of the deep buried pipe 302, and the deep pumping pipe 22 is correspondingly installed with 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 provides fluid to the second heat exchange path. The outlet of the solar energy system 4 and the outlet of the buried pipe assembly 31 are both connected to the inlet of the second heat exchange path, and the fluid in the buried pipe assembly 31 mixes with the fluid in the solar energy system 4 before flowing into the inlet of the second heat exchange path.

[0070] Specifically, when the shallow pumping pipeline 21 draws shallow fluid from the pumping well 204, the shallow pumping pipeline 21 sends the drawn fluid into the first heat exchange flow path. At the same time, 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 into the second heat exchange flow path. The refrigerant then exchanges heat with the fluid in the second heat exchange flow path a second time, and then flows out from the second heat exchanger 102. Similarly, when the deep pumping pipeline 22 draws deep fluid from the pumping well 204, the deep pumping pipeline 22 sends the drawn fluid into the first heat exchange flow path. At the same 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 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. When the heat pump unit system 1 is operating in heating mode, the solar energy system 4 also provides fluid to the second heat exchange flow path. 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. The mixing ratio of the buried pipe and the solar energy system 4 is then adjusted by the first three-way regulating valve 41, and finally flows into the second heat exchange flow path. After the fluid has completed heat exchange in the second heat exchange flow path, it flows back to the buried pipe.

[0071] In this embodiment, the buried pipe can also meet the heat exchange requirements, but the rate will gradually decrease. As the unit operates, the accumulation of cold and heat underground will gradually increase. Adding the solar energy system 4 and the pumping well 204 can slow down the rate of underground cold and heat accumulation, improving the reliability and economy of the unit's long-term operation. The water source heat pump system 2 and the ground source heat pump system 3 can provide stable heat energy under different environmental conditions, while the addition of the solar energy system 4 can provide additional heat energy when there is sufficient sunshine, enhancing the system's environmental adaptability. The integration of the solar energy system 4 can provide free heat during periods of abundant solar energy, reducing the consumption of electricity or other energy sources, thereby lowering the system's operating costs. Furthermore, the temperature of the ground source heat pump system 3 is relatively stable throughout the year, while the solar energy system 4 can provide stable heat energy during the day. This combination ensures stable operation of the system in different seasons and weather conditions, enhancing the system's energy self-sufficiency, reducing operating costs, and improving the system's economic efficiency.

[0072] See also Figure 1 and Figure 2As shown, the heat pump unit 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. The first valve port of the four-way valve 105 is connected to the air inlet of the compressor 103, the second valve port of the four-way valve 105 is connected to the air suction port of the compressor 103, the third valve port of the four-way valve 105 is connected to the first valve port of the second three-way regulating valve 106, and the fourth valve port of the four-way valve 105 is connected to the first inlet and outlet of the third heat exchanger 104; the second three-way regulating valve 105... The second valve port of valve 6 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 pipe, the second valve port of the third three-way regulating valve 107 is connected to the connecting pipe, 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, high-temperature and high-pressure refrigerant is discharged from compressor 103 and enters four-way valve 105. The high-temperature and high-pressure refrigerant flows through second three-way regulating valve 106 and successively into first heat exchanger 101 and second heat exchanger 102, where it is condensed into liquid. After passing through third three-way regulating valve 107, it enters first expansion valve 108 for throttling. The throttled refrigerant then enters third heat exchanger 104 for heat exchange, becoming low-temperature and low-pressure gaseous refrigerant before returning to compressor 103. During heating, high-temperature and high-pressure refrigerant is discharged from compressor 103 through four-way valve 105. The high-temperature and high-pressure refrigerant enters third heat exchanger 104, where it releases heat and is condensed into liquid. The liquid refrigerant then passes through second three-way regulating valve 106 and enters second expansion valve 109 for throttling. The throttled refrigerant then passes through first heat exchanger 101 and second heat exchanger 102 for heat exchange. The low-temperature and low-pressure refrigerant after heat exchange returns to compressor 103 through third three-way regulating valve 107 and 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 operated flexibly, so that the fluids flow into the first heat exchange path and the second heat exchange path respectively, and 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 of refrigerant in the system, ensuring 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 will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0076] The above are merely 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 should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A hybrid heat pump system, characterized by, The application relates to 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) comprises a first heat exchanger (101) and a second heat exchanger (102) 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 for supplying 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 refrigerant in the first heat exchanger (101). The ground source heat pump system (3) comprises a ground heat pipe group (31), the ground heat pipe group (31) is buried in soil, the pumping well (204) is arranged in the middle of a pipe cluster of the ground heat pipe group (31), the second heat exchanger (102) has a second heat exchange flow path, the ground heat pipe group (31) is used for supplying 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 refrigerant in the second heat exchanger (102). The ground heat pipe group (31) comprises a shallow ground heat pipe (301) and a deep ground heat pipe (302), the depth of the deep ground heat pipe (302) buried in soil is greater than the depth of the shallow ground heat pipe (301) buried in soil, the water outlet of the shallow ground heat pipe (301) and the water outlet of the deep ground heat pipe (302) are both communicated with the water inlet of the second heat exchange flow path, and the water inlet of the shallow ground heat pipe (301) and the water inlet of the deep ground heat pipe (302) are both communicated with the water outlet of the second heat exchange flow path. The water source heat pump system (2) further comprises a shallow pumping pipe (21) and a deep pumping pipe (22), one end of the shallow pumping pipe (21) is communicated with the pumping well (204), the other end of the shallow pumping pipe (21) is communicated with the water inlet of the first heat exchange flow path, one end of the deep pumping pipe (22) is communicated with the pumping well (204), the other end of the deep pumping pipe (22) is communicated with the water inlet of the first heat exchange flow path, and the depth of the deep pumping pipe (22) extending into the pumping well (204) is greater than the depth of the shallow pumping pipe (21) extending into the pumping well (204). ​ The water pumping well (204) is vertically arranged, a first water well water inlet for fluid return is arranged at the top end of the water pumping well (204), the top end of the water pumping well (204) is arranged in the middle of the pipe cluster of the shallow buried pipe (301), the shallow water pumping pipe (21) is arranged correspondingly to the shallow buried pipe (301), the fluid in the water pumping well (204) exchanges heat with the fluid buried in the soil of the shallow buried pipe (301); the bottom end of the water pumping well (204) is arranged in the middle of the pipe cluster of the deep buried pipe (302), a second water well water inlet for fluid return is arranged at the top end of the water pumping well (204), the deep water pumping pipe (22) is arranged correspondingly to the deep buried pipe (302), the fluid in the water pumping well (204) exchanges heat with the fluid buried in the soil of the deep buried pipe (302).

2. The hybrid heat pump system of claim 1, wherein, 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 communicated with the second water inlet main pipe (303) through a first water outlet branch pipe (304), and the first water outlet branch pipe (304) is provided with a first electromagnetic valve (305); the water outlet of the deep buried pipe (302) is communicated with the second water inlet main pipe (303) through a second water outlet branch pipe (306), and the second water outlet branch pipe (306) is provided with a second electromagnetic valve (307); The water outlet of the second heat exchange flow path is provided with a second water outlet main pipe (308), the second water outlet main pipe (308) is provided with a third electromagnetic valve (309), the water inlet of the shallow buried pipe (301) is communicated with 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 communicated with 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).

3. The hybrid heat pump system of claim 1, wherein, 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 pipe (21) comprises a first water pumping pipe (211) and a first water pumping pump (212), the first water pumping pipe (211) is provided with a fourth electromagnetic valve (213), the water inlet of the first water pumping pipe (211) extends into the water pumping well (204), the water outlet of the first water pumping pipe (211) is communicated with 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 pipe (211); The deep water pumping pipeline (22) comprises a second water pumping pipeline (221) and a second water pumping pump (222), the second water pumping pipeline (221) is provided with a fifth electromagnetic valve (223), a water inlet of the second water pumping pipeline (221) extends into the water pumping well (204), a water outlet of the second water pumping pipeline (221) is communicated with the first water inlet main pipe (201), the second water pumping pump (222) is arranged at the water inlet of the second water pumping pipeline (221), and the water inlet of the second water pumping pipeline (221) extends into the water pumping well (204) to a depth greater than that of the water inlet of the first water pumping pipeline (211). The water source heat pump system (2) further comprises a recharge well (203), and one end of the first water outlet main pipe (202) away from the first heat exchanger (101) is communicated with the recharge well (203).

4. The hybrid heat pump system of claim 1, wherein, A solar system (4) is further included, the solar system (4) is used for providing fluid to the second heat exchange flow path, a water outlet of the solar system (4) and a water outlet of the ground heat exchanger group (31) are both communicated with a water inlet of the second heat exchange flow path, and fluid in the ground heat exchanger group (31) is mixed with fluid in the solar system (4) and then flows into the water inlet of the second heat exchange flow path.

5. The hybrid heat pump system of claim 4, wherein, The water inlet of the second heat exchange flow path is provided with a first three-way regulating valve (41), a first valve port of the first three-way regulating valve (41) is communicated with the water inlet of the second heat exchange flow path, a second valve port of the first three-way regulating valve (41) is communicated with the water outlet of the ground heat exchanger group (31), and a third valve port of the first three-way regulating valve (41) is communicated with the water outlet of the solar system (4); the water inlet of the ground heat exchanger group (31) and the water inlet of the solar system (4) are both communicated with a water outlet of the second heat exchange flow path.

6. The hybrid heat pump system of claim 5, wherein, The solar system (4) comprises a collector (401), a water tank (402) and a third circulating water pump (403), the collector (401) is connected with the water tank (402), a water inlet of the water tank (402) is communicated with a water outlet of the second heat exchange flow path, a sixth electromagnetic valve (404) is arranged between the water inlet of the water tank (402) and the water outlet of the second heat exchange flow path; a water outlet of the water tank (402) is communicated with the third valve port of the first three-way regulating valve (41), the third circulating water pump (403) and a seventh electromagnetic valve (405) are arranged between the water outlet of the water tank (402) and the third valve port of the first three-way regulating valve (41) in sequence.

7. The hybrid heat pump system of any one of claims 1 to 6, wherein, 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 communicated with an air inlet of the compressor (103), a second valve port of the four-way valve (105) is communicated with a suction port of the compressor (103), a third valve port of the four-way valve (105) is communicated with a first valve port of the second three-way regulating valve (106), and a fourth valve port of the four-way valve (105) is communicated with a first inlet and outlet of the third heat exchanger (104); a second valve port of the second three-way regulating valve (106) is communicated with an inlet of the first heat exchanger (101), and a third valve port of the second three-way regulating valve (106) is communicated with a second inlet and outlet of the third heat exchanger (104); a first valve port of the third three-way regulating valve (107) is communicated with an 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 communicated through a connecting pipeline, a second valve port of the third three-way regulating valve (107) is communicated with the connecting pipeline, and a third valve port of the third three-way regulating valve (107) is communicated with the second inlet and outlet of the third heat exchanger (104).

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