Heat pump system

Abstract

The invention relates to the field of heat pump systems, in particular to a heat pump system, and aims to solve the problem that an existing heat pump system is low in heat exchange efficiency. In order to achieve the purpose, the heat pump system is a cascade heat pump system, a first compressor, an intermediate heat exchanger, a first throttling device and a first evaporator of the cascade heat pump system are sequentially arranged on a first refrigerant loop, and a second compressor, a first condenser, a second throttling device and the intermediate heat exchanger are sequentially arranged on a second refrigerant loop; refrigerants in the first refrigerant loop and the second refrigerant loop can exchange heat through the intermediate heat exchanger; the first passage structure and the second passage structure are connected in series, the first passage structure can exchange heat with the intermediate heat exchanger, and the second passage structure can exchange heat with the first condenser; a water inlet of the flash evaporation device is connected with the water outlet end of the second channel structure, a hot water outlet is connected with the water inlet end of the second channel structure, and the heat release structure can exchange heat with the first evaporator.

Description

Technical Field

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

[0002] Currently, heat pump systems are commonly used to generate hot water or steam. In traditional heat pump systems, tap water directly exchanges heat with the refrigerant in a high-temperature condenser. For example, tap water at around 20°C may directly exchange heat with the refrigerant in a condenser above 120°C. Due to the large temperature difference between the two (approximately 100°C), this heat exchange process results in relatively large irreversible losses, low heat exchange efficiency, and a low energy efficiency ratio (COP) for the entire system.

[0003] Furthermore, large temperature differences in heat exchange can increase system operating pressure and thermal stress in heat exchanger materials, impacting system reliability and durability. Furthermore, the complexity of system design and operation increases, making system maintenance and management inconvenient.

[0004] Accordingly, the art needs a new heat pump system to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem of low heat exchange efficiency of the existing heat pump system.

[0006] In a first aspect, the present invention provides a heat pump system, characterized in that the heat pump system includes: a first refrigerant circuit, on which a first compressor, an intermediate heat exchanger, a first throttling device and a first evaporator are provided in sequence; a second refrigerant circuit, on which a second compressor, a first condenser, a second throttling device and the intermediate heat exchanger are provided in sequence; the refrigerants in the first refrigerant circuit and the second refrigerant circuit can exchange heat through the intermediate heat exchanger; a heat release structure, wherein the heat release structure can exchange heat with the first evaporator; a first passage structure and a second passage structure connected in series, wherein the heat pump system is configured such that the first passage structure can exchange heat with the intermediate heat exchanger, and the second passage structure can exchange heat with the first condenser; a flash evaporation device, wherein the flash evaporation device includes a water inlet and a hot water outlet, wherein the water inlet is connected to the water outlet end of the second passage structure, and the hot water outlet is connected to the water inlet end of the second passage structure.

[0007] In an optional technical solution of the above-mentioned heat pump system, the heat pump system also includes a third refrigerant circuit, on which a third compressor, a second condenser, a third throttling device and a second evaporator are sequentially provided; the heat release structure is the second condenser.

[0008] In an optional technical solution of the above-mentioned heat pump system, the heat release structure is constituted as a heat source passage structure.

[0009] In an optional technical solution of the above-mentioned heat pump system, the heat source passage structure includes a heat exchange cavity, the heat exchange cavity is provided with a heat source inlet and a heat source outlet, and the first evaporator is arranged in the heat exchange cavity.

[0010] In the optional technical solution of the above-mentioned heat pump system, the intermediate heat exchanger includes a condenser connected to the first refrigerant circuit and an evaporator connected to the second refrigerant circuit, the first passage structure and the evaporator form a shell and tube structure, and the condenser is mounted on the shell and tube structure.

[0011] In an optional technical solution of the above heat pump system, the heat pump system further includes a first water vapor compressor, and the steam outlet of the flash evaporation device is connected to the inlet of the first water vapor compressor.

[0012] In an optional technical solution of the above-mentioned heat pump system, the heat pump system further includes a second water vapor compressor, the outlet of the first water vapor compressor is connected to the inlet of the second water vapor compressor via a connecting pipe, and the connecting pipe is provided with a water supply port.

[0013] In an optional technical solution of the above heat pump system, the heat pump system further includes a first water pump, and the first water pump is used to pump water from the first passage structure to the second passage structure.

[0014] In an optional technical solution of the above-mentioned heat pump system, the hot water outlet is connected to the second passage structure through a return pipe, and a second water pump is provided on the return pipe. The second water pump is used to pump water from the hot water outlet toward the water inlet end of the second passage structure.

[0015] In an optional technical solution of the above heat pump system, a pressure reducing device is provided between the water outlet end of the second passage structure and the water inlet.

[0016] When using the above technical solution, the newly added water undergoes three heat exchanges: through the intermediate heat exchanger, the first condenser, and the hot water in the flash evaporator. This significantly reduces heat exchange losses and improves system efficiency. This reduces the heat exchange temperature difference between the refrigerant and the water, optimizes heat exchange efficiency, and reduces energy losses, thereby significantly improving the energy efficiency of the entire heat pump system. This design allows the heat pump system to more efficiently utilize low-grade heat sources to provide the required high-temperature hot water. It is particularly suitable for heat recovery, high-temperature hot water supply, or steam generation in industrial or commercial applications, which is of great significance for energy conservation, emission reduction, and sustainable development. Furthermore, this design improves system reliability and durability, facilitating maintenance and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0018] Figure 1 1 is a schematic structural diagram of the heat pump system of the present invention (I);

[0019] Figure 2 Schematic diagram of the heat pump system of the present invention (II);

[0020] Figure 3 Schematic diagram (1) of a heat exchange structure composed of an intermediate heat exchanger and a first passage structure of a heat pump system of the present invention;

[0021] Figure 4 Schematic diagram (2) of the heat exchange structure composed of the intermediate heat exchanger and the first path structure of the heat pump system of the present invention.

[0022] Description of reference numerals:

[0023] 10-first refrigerant circuit; 11-first compressor; 12-intermediate heat exchanger; 121-evaporator tube; 1211-third through hole; 1212-fourth through hole; 122-condenser tube; 1221-first through hole; 1222-second through hole; 1223-fifth through hole; 1224-sixth through hole; 13-first throttling device; 14-first evaporator; 20-second refrigerant circuit; 21-second compressor; 22-first condenser; 23-second throttling device; 30-third refrigerant circuit; 31-third compressor; 32 -second condenser; 33-third throttling device; 34-second evaporator; 40-first passage structure; 41-second passage structure; 42-first water pipe; 43-second water pipe; 44-third water pipe; 45-first water pump; 50-flash tank; 501-water inlet; 502-steam outlet; 503-hot water outlet; 51-pressure reducing device; 52-second water pump; 53-return pipe; 60-first water vapor compressor; 70-heat source passage structure; 701-heat exchange cavity; 702-heat source inlet; 703-heat source outlet. DETAILED DESCRIPTION

[0024] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0025] It should be noted that, in the description of the present invention, the terms "first", "second" and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0026] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] In order to solve the problem of low heat exchange efficiency of the existing heat pump system, the present invention provides a heat pump system, such as Figure 1 and Figure 2 As shown, the heat pump system includes a first refrigerant circuit 10, a second refrigerant circuit 20, a first compressor 11, an intermediate heat exchanger 12, a first throttling device 13, a first evaporator 14, a second compressor 21, a first condenser 22, a second throttling device 23, a first passage structure 40 and a second passage structure 41 connected in series, a flash device and a heat release structure, the first compressor 11, the intermediate heat exchanger 12, the first throttling device 13 and the first evaporator 14 are sequentially arranged on the first refrigerant circuit 10, the second compressor 21, the first condenser 22, the second throttling device 23 and The intermediate heat exchanger 12 is sequentially arranged on the second refrigerant circuit 20, and the refrigerants in the first refrigerant circuit 10 and the second refrigerant circuit 20 can exchange heat through the intermediate heat exchanger 12; the heat pump system is configured such that the first passage structure 40 can exchange heat with the intermediate heat exchanger 12, and the second passage structure 41 can exchange heat with the first condenser 22; the flash evaporation device includes a water inlet 501 and a hot water outlet 503, the water inlet 501 is connected to the water outlet end of the second passage structure 41, and the hot water outlet 503 is connected to the water inlet end of the second passage structure 41, and the heat release structure can exchange heat with the first evaporator 14. The present invention does not limit the specific structural form of the first throttling device 13 and the second throttling device 23, as long as it can perform throttling and pressure reduction, such as a capillary tube or an electronic expansion valve.

[0028] The first passage structure 40 and the second passage structure 41 refer to passage structures having a water inlet and a water outlet, and water can enter the passage structure from the water inlet and flow out from the water outlet. The present invention does not limit the specific form of the first passage structure 40 and the second passage structure 41. As long as they can pass water, their specific form can be adjusted, for example, they can be a straight tube, a coil, or a structure with a water channel in the shell, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention. It can be understood that the flash evaporation device is a process equipment that uses pressure reduction to partially vaporize the liquid, and can also be called a flash tank 50.

[0029] Currently, for industrial heat pumps such as those used to prepare steam, when the temperature of the prepared steam is 120°C, the temperature rise of a single-stage compression heat pump is limited. Therefore, the present invention adopts at least two-stage cascade compression, and causes the refrigerant in the first refrigerant circuit 10 to first absorb heat from the heat release structure to increase the temperature of the refrigerant in the first refrigerant circuit 10 in the intermediate heat exchanger 12, so that the condensation temperature reaches about 90°C. Specifically, in the circulation of the first refrigerant circuit 10, the refrigerant in the first evaporator 14 absorbs heat from the heat release structure and then enters the first compressor 11 for compression and temperature increase, and then enters the intermediate heat exchanger 12, where the refrigerant exchanges heat with the water in the first passage structure 40 and the refrigerant in the second refrigerant circuit 20, transferring heat to the water in the first passage structure 40 and the refrigerant in the second refrigerant circuit 20, causing the water temperature to rise to about 90°C. The refrigerant then flows to the first throttling device 13, and the pressure decreases after flowing through the first throttling device 13, and absorbs heat in the first evaporator 14, completing the cycle. In the second refrigerant circuit 20, the refrigerant is compressed by the second compressor 21, reaching a maximum temperature of approximately 120°C. The refrigerant then transfers heat to the water in the second passage structure 41 in the first condenser 22. The refrigerant then flows to the second throttling device 23, where its pressure decreases. The refrigerant then absorbs heat in the intermediate heat exchanger 12, completing the cycle. Hot water flowing out of the flash evaporator's hot water outlet 503 returns to the water inlet of the second passage structure 41. The waste heat from the flash tank 50 is used to raise the water inlet temperature of the second passage structure 41, improving heat exchange efficiency and ensuring that the water temperature entering the flash tank 50 exceeds 120°C.

[0030] In this way, the newly added water undergoes heat exchange through three streams: the intermediate heat exchanger 12, the first condenser 22, and the hot water in the flash evaporator. This significantly reduces heat exchange losses and improves system efficiency. This reduces the heat exchange temperature difference between the refrigerant and the water, optimizes heat exchange efficiency, and reduces energy losses, thereby significantly improving the energy efficiency of the entire heat pump system. This design allows the heat pump system to more efficiently utilize low-grade heat sources to provide the required high-temperature hot water. It is particularly suitable for industrial or commercial heat recovery, high-temperature hot water supply, or steam generation, which is of great significance for energy conservation, emission reduction, and sustainable development. Furthermore, this design improves the reliability and durability of the system, facilitating maintenance and management.

[0031] Possibly, the heat pump system includes a first water pipe 42, a second water pipe 43, and a third water pipe 44, wherein the water outlet of the first water pipe 42 is connected to the water inlet of the first passage structure 40, the water outlet of the first passage structure 40 is connected to the water inlet of the second passage structure 41 via the second water pipe 43, and the water outlet of the second passage structure 41 is connected to the water inlet 501 via the third water pipe 44. Of course, the above is merely exemplary, and at least one of the first water pipe 42, the second water pipe 43, and the third water pipe 44 may be omitted. A pressure reducing device 51 may be provided between the water outlet of the second passage structure 41 and the water inlet 501. The pressure reducing device 51 may be provided on the third water pipe 44, or may be directly connected to the water outlet and the water inlet 501 of the second passage structure 41. The pressure reducing device 51 may specifically be a pressure reducing valve, an expansion valve, a pressure regulating valve, or the like. For example, when hot water at 120°C is reduced in pressure by the pressure reducing device 51 and enters the flash tank 50 through the water inlet 501, the pressure inside the tank is lower than the saturated vapor pressure of water at 120°C, and the water will be partially converted into steam, thereby producing 120°C water vapor.

[0032] The hot water outlet 503 can be connected to the water inlet of the second passage structure 41 via a return pipe 53. Specifically, the water outlet of the return pipe 53 can be indirectly connected to the water inlet of the second passage structure 41 via the second water pipe 43. Of course, the water outlet of the return pipe 53 can also be directly connected to the water inlet of the second passage structure 41. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0033] Optionally, a second water pump 52 is provided on the water return pipe 53, and the second water pump 52 is used to pump water from the hot water outlet 503 toward the water inlet end of the second passage structure 41. For example, the water return pipe 53 includes a first water return section and a second water return section, wherein one end of the first water return section is connected to the hot water outlet 503, and the other end of the first water return section is connected to the water inlet of the second water pump 52; one end of the second water return section is connected to the water outlet of the second water pump 52, and the other end of the second water return section is connected to the water inlet end of the second passage structure 41. Of course, the above is only exemplary. As long as the second water pump 52 can pump water from the hot water outlet 503 to the water inlet end of the second passage structure 41, its specific setting method can be adjusted. For example, the setting of the first return water section can be omitted, and the water inlet of the second water pump 52 is directly connected to the hot water outlet 503 of the flash tank 50, or the setting of the second return water section can be omitted, and the water outlet of the second water pump 52 is directly connected to the water inlet end of the second passage structure 41, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention. This configuration provides an additional control point, which can adjust the speed of the second water pump 52 according to the actual working conditions of the system, and then adjust the water inlet temperature of the second passage structure 41, thereby increasing the flexibility of system design.

[0034] As a possible embodiment, the heat pump system further includes a first water pump 45, which is used to pump water from the first passage structure 40 to the second passage structure 41. The present invention does not limit the location of the first water pump 45. For example, the first water pump 45 can be located on the first water pipe 42, or on either the second water pipe 43 or the third water pipe 44. Adjustments to these locations do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0035] As a possible implementation method, refer to Figure 1 The heat pump system further includes a third refrigerant circuit 30, which is sequentially provided with a third compressor 31, a second condenser 32, a third throttling device 33, and a second evaporator 34. The heat release structure described above is the second condenser 32. The present invention does not limit the specific structure of the third throttling device 33, as long as it can throttle and reduce pressure, such as a capillary tube or an electronic expansion valve.

[0036] The heat pump system of the present invention adopts three-stage cascade compression. In the third refrigerant circuit 30, the refrigerant in the second evaporator 34 absorbs heat from the environment (air source, water source, etc., such as about 20°C) and then enters the third compressor 31 for compression and temperature increase, and then enters the second condenser 32, so that the condensation temperature of the second condenser 32 is raised to about 60°C. The refrigerant exchanges heat with the first evaporator 14 in the second condenser 32 and flows to the third throttling device 33. After flowing through the third throttling device 33, the pressure decreases, and it absorbs heat in the second evaporator 34 to complete the cycle.

[0037] The heat exchanger formed by the second condenser 32 and the first evaporator 14 can have various structures. For example, the second condenser 32 and the first evaporator 14 can form a double-tube heat exchanger, a plate heat exchanger, or a spiral heat exchanger. As long as heat exchange between the second condenser 32 and the first evaporator 14 is achieved, the present invention does not impose any restrictions on the specific structure. Adjustments to these specific structures do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0038] As another possible implementation, refer to Figure 2 The heat release structure is configured as a heat source path structure 70. Currently, in industrial heat pumps, such as for steam production, waste heat is generated, with a temperature of approximately 50 to 70°C. Therefore, the present invention configures the heat release structure as a heat source path structure 70. A heat source can enter the heat source path structure 70 through a path in the heat source path structure 70, allowing the heat source path structure 70 to transfer the released heat to the first evaporator 14.

[0039] The following is an introduction to a possible heat exchanger structure composed of the heat source passage structure 70 and the first evaporator 14. As a possible embodiment, the heat source passage structure 70 includes a heat exchange cavity 701, and the heat exchange cavity 701 is provided with a heat source inlet 702 and a heat source outlet 703, and the first evaporator 14 is arranged in the heat exchange cavity 701. If a first interface and a second interface are also provided on the heat exchange cavity 701, the two ends of the first evaporator 14 are respectively connected to the first interface and the second interface, and the first interface and the second interface are also connected to the first refrigerant circuit 10. Of course, the above is not restrictive, and its setting method can be adjusted. For example, both ends of the first evaporator 14 extend from the heat source inlet and the heat source outlet 703 to achieve connection with the first refrigerant circuit 10, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0040] Because the first evaporator 14 is located within the heat exchange chamber 701, a more direct heat exchange process can be achieved, reducing heat loss and thus improving heat exchange efficiency. Because the heat exchange between the first evaporator 14 and the heat source occurs within the same closed environment, flow control valves can be installed at the heat source inlet 702 and the heat source outlet 703 to precisely control the heat source heat entering the heat exchange chamber 701, ensuring that the temperature within the chamber meets the requirements and is neither too high nor too low. Furthermore, the design of being located within the heat exchange chamber 701 allows the first evaporator 14 to adapt to different heat source variations, as the internal components can be more easily reconfigured or adjusted as needed to optimally utilize the different heat source characteristics.

[0041] Of course, the possible heat exchanger structure formed by the heat source path structure 70 and the first evaporator 14 is not restrictive. As long as heat exchange between the heat source path structure 70 and the first evaporator 14 is achieved, the specific structure can be adjusted. For example, the heat exchanger structure formed by the first evaporator 14 and the heat source path structure 70 can be a shell-and-tube heat exchanger or a plate heat exchanger. These specific adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0042] As a possible implementation, Figure 3 and Figure 4 As shown, the intermediate heat exchanger 12 includes a condenser tube 122 connected to the first refrigerant circuit 10 and an evaporator tube 121 connected to the second refrigerant circuit 20. The first passage structure 40 and the evaporator tube 121 form a shell and tube structure, and the condenser tube 122 is sleeved on the shell and tube structure.

[0043] The evaporator and the first passage structure 40 are arranged as the cold end on the inner side of the condenser tube 122, and the condenser tube 122 is arranged as the hot end on the outermost side. This can optimize the temperature difference, which is beneficial to improving the driving force of heat exchange, and can enable the refrigerant in the evaporator tube 121 and the water in the first passage structure 40 to effectively absorb the heat released by the heat source in the outer condenser tube 122, thereby reducing heat loss. The arrangement of the two cold ends being arranged on the inside and the hot end being arranged on the outside can also reduce the circulation of heat in different parts, which is beneficial to maintaining the stability and reliability of the system. In addition, since the cold end is on the inside, the temperature of the hot end on the outside will not be too high, which reduces the thermal stress of the hot end components and reduces the risk of leakage caused by temperature changes.

[0044] Possibly, the evaporation tube 121 can be sleeved on the outside of the first passage structure 40, and the condensation tube 122 can be sleeved on the outside of the evaporation tube 121. In order to facilitate connection, a first through hole 1221 and a second through hole 1222 can be set on the side wall of the condensation tube 122, and a third through hole 1211 can be set on the side wall of the evaporation tube 121. The end of the first passage structure 40 is sealed through the third through hole 1211 and the first through hole 1221, so that the end is connected in series with the second passage structure 41. The end of the evaporation tube 121 is sealed through the second through hole 1222, so that the end of the evaporation tube 121 is connected to the second refrigerant circuit 20, and the end of the condensation tube 122 can be directly connected to the first refrigerant circuit 10. The ends of the condensation tube 122, the evaporation tube 121 and the first passage structure 40 described above can be ends located on the same side, and the ends on the other side can also be connected based on the method described above. Of course, the above description is only one possible implementation method. In actual application, its structure can be adjusted. For example, refer to Figure 4 The ends of the evaporator tube 121 and the condenser tube 122 are sealed, a fourth through hole 1212 is provided on the side of the evaporator tube 121, and a fifth through hole 1223 and a sixth through hole 1224 are provided on the side of the condenser tube 122. The first passage structure 40 sequentially passes through the ends of the evaporator tube 121 and the condenser tube 122 in a sealed manner. The fourth through hole 1212 and the fifth through hole 1223 are sealedly connected by a tube. The sixth through hole 1224 serves as a refrigerant inlet or outlet, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention. Alternatively, the first passage structure 40 can be sleeved on the outside of the evaporator tube 121, and the condenser tube 122 can be sleeved on the outside of the first passage structure 40.

[0045] As a possible embodiment, the heat pump system further includes a first water vapor compressor 60, and the steam outlet 502 is connected to the inlet of the first water vapor compressor 60. The first water vapor compressor 60 increases the thermal energy level of the steam by increasing the pressure and temperature of the steam, so that the steam temperature can be raised to above 120°C.

[0046] As a possible implementation, the heat pump system further includes a second water vapor compressor (not shown in the figure), and the outlet of the first water vapor compressor 60 is connected to the inlet of the second water vapor compressor.

[0047] Connecting the outlet of the first steam compressor 60 to the inlet of the second steam compressor forms a two-stage compression system. This configuration offers the following advantages: Two-stage compression can more efficiently raise the temperature and pressure of the steam, thereby improving the thermal efficiency of the entire system. Two-stage compression requires less power than single-stage compression because less total power is required to compress the steam to the same final pressure, thus saving energy. A two-stage compression system can smooth the compression process, reducing pressure pulses and thermal stresses in the system, thereby enhancing system stability and reliability.

[0048] Furthermore, the outlet of the first water vapor compressor 60 is connected to the inlet of the second water vapor compressor via a connecting pipe, and a water supply port is provided on the connecting pipe. A water supply pipe may be provided to connect the water supply port for drainage.

[0049] A water injection port is installed between the two compression stages. The added cold water lowers the temperature of the gas at the inlet of the second steam compressor, thereby improving compression efficiency because the compressor requires less energy to process low-temperature gas than to process high-temperature gas. During the high-temperature steam compression stage, if the water vapor overheats, it may damage the mechanical components of the compressor. Adding water helps control the steam temperature and reduce the risk of overheating.

[0050] It should be noted that the above-mentioned embodiments are only used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above-mentioned structure so that the present invention can be applied to more specific application scenarios.

[0051] For example, as an alternative embodiment, although the intermediate heat exchanger 12 and the first passage structure 40 of the present invention are introduced as a shell-and-tube structure, this is not intended to limit the scope of protection of the present invention. As long as the heat exchange between the first passage structure 40 and the intermediate heat exchanger 12 can be achieved, its specific form can be adjusted. For example, a plate heat exchanger, a microchannel heat exchanger or a spiral heat exchanger, etc. are formed between the intermediate heat exchanger 12 and the first passage structure 40. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0052] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A heat pump system, characterized in that: The heat pump system comprises: a first refrigerant circuit, wherein the first refrigerant circuit is provided with a first compressor, an intermediate heat exchanger, a first throttling device and a first evaporator in sequence; a second refrigerant circuit, wherein the second refrigerant circuit is provided with a second compressor, a first condenser, a second throttling device and the intermediate heat exchanger in sequence; The refrigerants in the first refrigerant circuit and the second refrigerant circuit can exchange heat through the intermediate heat exchanger; a heat release structure capable of exchanging heat with the first evaporator; a first passage structure and a second passage structure connected in series, the heat pump system being configured such that the first passage structure can exchange heat with the intermediate heat exchanger, and the second passage structure can exchange heat with the first condenser; A flash evaporation device includes a water inlet and a hot water outlet, the water inlet is connected to the water outlet end of the second passage structure, and the hot water outlet is connected to the water inlet end of the second passage structure.

2. The heat pump system according to claim 1, characterized in that The heat pump system further comprises a third refrigerant circuit, wherein the third refrigerant circuit is provided with a third compressor, a second condenser, a third throttling device and a second evaporator in sequence; The heat release structure is the second condenser.

3. The heat pump system according to claim 1, characterized in that The heat release structure is configured as a heat source passage structure.

4. The heat pump system according to claim 3, characterized in that The heat source passage structure includes a heat exchange cavity, the heat exchange cavity is provided with a heat source inlet and a heat source outlet, and the first evaporator is arranged in the heat exchange cavity.

5. The heat pump system according to claim 1, characterized in that The intermediate heat exchanger includes a condenser connected to the first refrigerant circuit and an evaporator connected to the second refrigerant circuit. The first passage structure and the evaporator form a shell and tube structure, and the condenser is sleeved on the shell and tube structure.

6. The heat pump system according to claim 2 or 3, characterized in that: The heat pump system further includes a first water vapor compressor, and the steam outlet of the flash evaporation device is connected to the inlet of the first water vapor compressor.

7. The heat pump system according to claim 6, characterized in that The heat pump system further includes a second water vapor compressor. The outlet of the first water vapor compressor is connected to the inlet of the second water vapor compressor via a connecting pipe, and a water supply port is provided on the connecting pipe.

8. The heat pump system according to claim 1, wherein: The heat pump system further includes a first water pump, which is used to pump water from the first passage structure to the second passage structure.

9. The heat pump system according to claim 1, characterized in that The hot water outlet is connected to the second passage structure via a return pipe. A second water pump is provided on the return pipe. The second water pump is used to pump water from the hot water outlet toward the water inlet end of the second passage structure.

10. The heat pump system according to claim 1, characterized in that A pressure reducing device is provided between the water outlet end of the second passage structure and the water inlet.

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