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 comprises a first refrigerant loop, a second refrigerant loop, a heat source passage structure, a first passage structure, a second passage structure and a third passage structure, the first passage structure, the second passage structure and the third passage structure are connected in series, and a first compressor, an intermediate heat exchanger, a first throttling device and an evaporator are sequentially arranged on the first refrigerant loop; a second compressor, a condenser, a second throttling device and an intermediate heat exchanger are sequentially arranged on the second refrigerant loop; the heat pump system is arranged to be of a first channel structure, heat exchange can be conducted between the heat source channel structure and the evaporator, heat exchange can be conducted between the second channel structure and the intermediate heat exchanger, and heat exchange can be conducted between the third channel structure and the condenser. According to the arrangement, the heat exchange temperature difference between a refrigerant and water is greatly reduced, the heat exchange efficiency is optimized, the energy loss is reduced, and therefore the energy efficiency ratio of the whole heat pump system is greatly increased.

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 an evaporator are provided in sequence; a second refrigerant circuit, on which a second compressor, a 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 be heat exchanged through the intermediate heat exchanger; a heat source path structure; a first path structure, a second path structure and a third path structure connected in series, the heat pump system being configured so that the first path structure, the heat source path structure and the evaporator can exchange heat, the second path structure can exchange heat with the intermediate heat exchanger, and the third path structure can exchange heat with the condenser.

[0007] In an optional technical solution of the above-mentioned heat pump system, the heat pump system also includes a flash tank, which includes a water inlet and a steam outlet. The water outlet end of the third passage structure is connected to the water inlet, and a pressure reducing device is provided between the water outlet end of the third passage structure and the water inlet.

[0008] In an optional technical solution of the above heat pump system, the flash tank further includes a hot water outlet, and the hot water outlet is connected to the water inlet end of the third passage structure.

[0009] 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 is connected to the inlet of the first water vapor compressor.

[0010] In an optional technical solution of the above heat pump system, the heat pump system further includes a second water vapor compressor, and the outlet of the first water vapor compressor is connected to the inlet of the second water vapor compressor.

[0011] In an optional technical solution of the above-mentioned heat pump system, 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.

[0012] 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, the evaporator and the first passage structure are arranged in the heat exchange cavity; or the first passage structure and the evaporator constitute a first shell and tube heat exchange structure, and the heat source passage structure is sleeved on the first shell and tube heat exchange structure.

[0013] 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 evaporator and the second passage structure constitute a second shell-and-tube heat exchange structure, and the condenser is mounted on the second shell-and-tube heat exchange structure.

[0014] In an optional technical solution of the above heat pump system, the heat pump system further includes a first water pump, which is used to pump water from the first passage structure to the third passage structure.

[0015] In an optional technical solution of the above-mentioned heat pump system, the hot water outlet and the water inlet end of the third passage structure are connected by 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 third passage structure.

[0016] When the above technical solution is adopted, the newly added water in the first path structure and the refrigerant in the evaporator are both subjected to heat exchange with the heat source in the heat source path structure (first heat exchange), and the heated water is then subjected to a second heat exchange with the intermediate heat exchanger, and finally to a final heat exchange with the condenser. In this way, the newly added water undergoes three stages of heat exchange, and the temperature difference of each stage is no more than 40°C, which greatly reduces the heat exchange loss and improves the efficiency of the system. Since the heat pump system of the present invention can achieve graded heating of water, the heat exchange temperature difference between the refrigerant and water is greatly reduced during the heating process, the heat exchange efficiency is optimized, and the energy loss is reduced, thereby greatly improving the energy efficiency ratio of the entire heat pump system. Through this graded design, the heat pump system can more efficiently utilize low-grade heat sources and provide the required high-temperature hot water, which is particularly suitable for industrial or commercial heat recovery, high-temperature hot water supply or water vapor preparation, which is of great significance for energy conservation, emission reduction and sustainable development. In addition, this graded design can also improve the reliability and durability of the system and facilitate 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 a first path structure, an evaporator, and a heat source path structure of a heat pump system of the present invention;

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

[0022] 10-first refrigerant circuit; 11-first compressor; 12-intermediate heat exchanger; 13-first throttling device; 14-evaporator; 141-third through hole; 142-fourth through hole; 20-second refrigerant circuit; 21-second compressor; 22-condenser; 23-second throttling device; 30-heat source passage structure; 301-heat exchange cavity; 302-heat source inlet; 303-heat source outlet; 304-first through hole; 305-second through hole; 306-fifth through hole; 307-third through hole Six through holes; 40-first passage structure; 41-second passage structure; 42-third passage structure; 43-first water pipe; 44-second water pipe; 45-third water pipe; 46-fourth water pipe; 47-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; 61-second water vapor compressor; 62-connecting pipe; 621-water supply port. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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 1As shown, the heat pump system includes a first refrigerant circuit 10, a second refrigerant circuit 20, a heat source path structure 30, a first path structure 40, a second path structure 41 and a third path structure 42 connected in series, the first refrigerant circuit 10 is provided with a first compressor 11, an intermediate heat exchanger 12, a first throttling device 13 and an evaporator 14 in sequence; the second refrigerant circuit 20 is provided with a second compressor 21, a condenser 22, a second throttling device 23 and an intermediate heat exchanger 12 in sequence; the heat pump system is configured so that heat can be exchanged between the first path structure 40, the heat source path structure 30 and the evaporator 14, the second path structure 41 can exchange heat with the intermediate heat exchanger 12, and the third path structure 42 can exchange heat with the condenser 22. It is understood that the above-mentioned refrigerant circuit refers to a physical structure that constitutes the circuit, that is, a refrigerant circulation pipe. In addition, it is understood that water can be passed into the first path structure 40, the second path structure 41 and the third path structure 42 described above, or other fluids that can be heated can be passed into them. For ease of explanation, the following description will be made using water flow as an example. Among them, the first passage structure 40, the second passage structure 41 and the third passage structure 42 refer to passage structures with a water inlet end and a water outlet end. Water can enter the passage structure from the water inlet end and flow out from the water outlet end. The present invention does not limit the specific form of the first passage structure 40, the second passage structure 41 and the third passage structure 42. As long as water can flow, the specific form can be adjusted, for example, it can be a straight pipe, 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. In addition, 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, etc.

[0027] Currently, for industrial heat pumps, such as those used to generate steam, waste heat is present in scenarios where the waste heat is approximately 50-70°C. When the temperature of the generated steam is 120°C, the temperature rise of a single-stage compression heat pump is limited. Therefore, the present invention uses a two-stage cascade compression method to allow the refrigerant in the heat pump system to first absorb heat from the waste heat. In the low-temperature first refrigerant circuit 10, the heat source enters the heat source path structure 30 to exchange heat with the evaporator 14 and the first path structure 40. The water in the first path structure 40 is heated and then enters the second path structure 41. The heated refrigerant enters the first compressor 11 for compression and temperature increase, and then enters the intermediate heat exchanger 12. Here, the refrigerant exchanges heat with the water in the second path structure 41 and the refrigerant in the second refrigerant circuit 20, transferring heat to the water in the second path structure 41 and the refrigerant in the second refrigerant circuit 20, raising the water temperature to approximately 90°C. The refrigerant then flows to the first throttling device 13, where the pressure decreases after passing through the first throttling device 13 and absorbs heat in the evaporator 14, completing the low-temperature cycle. In the high-temperature stage of the second refrigerant circuit 20 circulation, the refrigerant is compressed by the second compressor 21 and raised to the highest temperature. Then, the heat is transferred to the water in the third passage structure 42 in the condenser 22. At this time, the water temperature can reach about 120°C. The refrigerant then flows to the second throttling device 23. After flowing through the second throttling device 23, the pressure is reduced and the refrigerant absorbs heat in the intermediate heat exchanger 12 to complete the high-temperature stage circulation.

[0028] The newly added water in the first passage structure 40 and the refrigerant in the evaporator 14 both exchange heat with the heat source in the heat source passage structure 30 (first heat exchange). The heated water then undergoes a second heat exchange with the intermediate heat exchanger 12, and finally a final heat exchange with the condenser 22. In this way, the newly added water undergoes three stages of heat exchange, with the temperature difference of each stage being no higher than 40°C, which greatly reduces heat exchange losses and improves the efficiency of the system. Since the heat pump system of the present invention can achieve graded heating of water, the heat exchange temperature difference between the refrigerant and water is greatly reduced during the heating process, the heat exchange efficiency is optimized, and energy losses are reduced, thereby significantly improving the energy efficiency ratio of the entire heat pump system. Through this graded design, the heat pump system can more efficiently utilize low-grade heat sources and provide the required high-temperature hot water. It is particularly suitable for industrial or commercial heat recovery, high-temperature hot water supply or water vapor preparation, which is of great significance for energy conservation, emission reduction and sustainable development. In addition, this graded design can also improve the reliability and durability of the system, making it easier to maintain and manage.

[0029] As a possible embodiment, the heat pump system of the present invention also includes a flash tank 50, which includes a water inlet 501, a steam outlet 502 and a hot water outlet 503. The water outlet end of the third passage structure 42 is connected to the water inlet 501, and a pressure reducing device 51 is provided between the water outlet end of the third passage structure 42 and the water inlet 501.

[0030] Possibly, the heat pump system includes a first water pipe 43, a second water pipe 44, a third water pipe 45, and a fourth water pipe 46. The water outlet of the first water pipe 43 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 44. The water outlet of the second passage is connected to the water inlet of the third passage structure 42 via the third water pipe 45. The water outlet of the third passage structure 42 is connected to the water inlet 501 via the fourth water pipe 46. Of course, the above is merely exemplary, and at least one of the first water pipe 43, the second water pipe 44, the third water pipe 45, and the fourth water pipe 46 may be omitted. The pressure reducing device 51 may be provided on the fourth water pipe 46, or may be directly connected to the water outlet of the third passage structure 42 and the water inlet 501. The pressure reducing device 51 may specifically be a pressure reducing valve, an expansion valve, or a pressure regulating valve, etc. When hot water at 120°C is decompressed by the decompression 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 water vapor at about 120°C.

[0031] As one possible embodiment, the hot water outlet 503 of the flash tank 50 is connected to the water inlet of the third passage structure 42. For example, the hot water outlet 503 and the water inlet of the third passage structure 42 are connected via a return pipe 53. Specifically, the water outlet of the return pipe 53 can be indirectly connected to the water inlet of the third passage structure 42 via a third water pipe 45. Of course, the water outlet of the return pipe 53 can also be directly connected to the water inlet of the third passage structure 42. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0032] 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 of the third passage structure 42. 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 of the third passage structure 42. 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 third passage structure 42, 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 third passage structure 42, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0033] By connecting the hot water outlet 503 of the flash tank 50 to the water inlet of the third passage structure 42, the heat pump system can recover some heat energy. This waste heat from the flash tank 50 can be used to raise the water inlet temperature of the third passage structure 42, further reducing the heat exchange temperature difference and improving heat exchange efficiency. Furthermore, this configuration provides an additional control point, allowing the speed of the second water pump 52, and thus the water inlet temperature of the third passage structure 42, to be adjusted according to the actual operating conditions of the system, increasing the flexibility of system design.

[0034] As a possible embodiment, the heat pump system further includes a first water pump 47, which is used to pump water from the first passage structure 40 to the third passage structure 42. The present invention does not limit the location of the first water pump 47. For example, the first water pump 47 may be located on the first water pipe 43, or on one of the second water pipe 44, the third water pipe 45, or the fourth water pipe 46. 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, Figure 2 As shown, the heat pump system further includes a first steam compressor 60, and the steam outlet 502 is connected to the inlet of the first steam compressor 60. The first steam compressor 60 increases the steam pressure and temperature, thereby increasing the steam thermal energy level to above 120°C.

[0036] As a possible implementation, the heat pump system further includes a second water vapor compressor 61 , and the outlet of the first water vapor compressor 60 is connected to the inlet of the second water vapor compressor 61 .

[0037] Connecting the outlet of the first steam compressor 60 to the inlet of the second steam compressor 61 forms a two-stage compression system. This configuration has the following advantages: Two-stage compression can more efficiently increase the temperature and pressure of the steam, thereby improving the thermal efficiency of the entire system. The steam temperature after passing through the second steam compressor 61 can reach 160°C. Two-stage compression requires less power than single-stage compression because the total power consumption required to compress the steam to the same final pressure is less, thus achieving energy savings. A two-stage compression system can smooth the compression process, reduce pressure pulses and thermal stress in the system, and thus enhance system stability and reliability.

[0038] Furthermore, the outlet of the first water vapor compressor 60 is connected to the inlet of the second water vapor compressor 61 via a connecting pipe 62, and the connecting pipe 62 is provided with a water supply port 621. A water supply pipe may be provided to connect the water supply port 621 to facilitate drainage.

[0039] A water supply port 621 is provided between the two compression stages. The added cold water lowers the temperature of the gas at the inlet of the second water vapor compressor 61, thereby improving compression efficiency. This is 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. Water supply helps control the steam temperature and reduce the risk of overheating.

[0040] There are many specific forms of the heat exchange structure composed of the first passage structure 40, the evaporator 14 and the heat source passage structure 30. The following two possible implementations are described as examples.

[0041] In a first possible embodiment, the heat source path structure 30 includes a heat exchange cavity 301, which is provided with a heat source inlet 302 and a heat source outlet 303. The evaporator 14 and the first path structure 40 are disposed in the heat exchange cavity 301. If the heat exchange cavity 301 is further provided with a first interface, a second interface, a third interface, and a fourth interface, the two ends of the evaporator 14 are connected to the first interface and the second interface, respectively, and the two ends of the first path structure 40 are connected to the third interface and the fourth interface, respectively. The first interface and the second interface are also connected to the first refrigerant circuit 10, the third interface is connected to the water outlet end of the first water pipe 43, and the fourth interface is connected to the water inlet end of the second water pipe 44. Of course, the above is not restrictive, and its arrangement can be adjusted. For example, both ends of the evaporator 14 and the first path structure 40 extend from the heat source inlet and the heat source outlet 303 to achieve connection with the first refrigerant circuit 10 and the water pipe, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0042] Since the evaporator 14 and the first path structure 40 are in the same heat exchange cavity 301, a more direct heat exchange process can be achieved, heat loss can be reduced, and the efficiency of heat exchange can be improved. As an integrated unit, the heat exchange cavity 301 is convenient for managing and optimizing heat flow and distribution, and the thermal efficiency and system response speed can be further improved through design optimization. Because the heat exchange between the evaporator 14 and the first path structure 40 is carried out in the same closed environment, flow regulating valves can be set at the heat source inlet 302 and the heat source outlet 303 respectively to accurately control the heat source heat entering the heat exchange cavity 301, ensuring that the temperature in the heat exchange cavity 301 meets the requirements and is neither too high nor too low. In addition, the design provided in the heat exchange cavity 301 can allow the evaporator 14 and the first path structure 40 to adapt to different heat source changes, because the internal components can be more easily reconfigured or adjusted as needed to best utilize different heat source characteristics.

[0043] A second possible implementation method is as follows: Figure 3 and Figure 4As shown, the first passage structure 40 and the evaporator 14 form a first shell-and-tube heat exchange structure, and the heat source passage structure 30 is sleeved on the first shell-and-tube heat exchange structure. The evaporator 14 and the first passage structure 40 are arranged on the inner side of the heat source passage structure 30 as the cold end, and the heat source passage structure 30 is sleeved on the outermost side as the hot end. This can optimize the temperature difference, which is conducive to improving the driving force of heat exchange. It can enable the refrigerant in the evaporator 14 and the water in the first passage structure 40 to effectively absorb the heat released by the heat source in the outer heat source passage structure 30, 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 conducive 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 evaporator 14 can be sleeved on the outside of the first passage structure 40, and the heat source passage structure 30 can be sleeved on the outside of the evaporator 14. Figure 3 , a first through hole 304 and a second through hole 305 can be set on the side wall of the heat source passage structure 30, and a third through hole 141 can be set on the side wall of the evaporator 14. The end of the first passage structure 40 is sealed through the third through hole 141 and the first through hole 304, so that the end is connected in series with other passage structures. The end of the evaporator 14 is sealed through the second through hole 305, so that the end of the evaporator 14 is connected to the first refrigerant circuit 10. The end of the heat source passage structure 30 can be directly connected to the first refrigerant circuit 10. The ends of the heat source passage structure 30, evaporator 14 and 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 applications, its structure can be adjusted. For example, refer to Figure 4 The ends of the evaporator 14 and the heat source passage structure 30 are sealed, a fourth through hole 142 is provided on the side of the evaporator 14, and a fifth through hole 306 and a sixth through hole 307 are provided on the side of the heat source passage structure 30. The first passage structure 40 is sealed through the ends of the evaporator 14 and the heat source passage structure 30 in sequence. The fourth through hole 142 and the fifth through hole 306 are sealed and connected by a tube. The sixth through hole 307 serves as a refrigerant inlet or outlet, etc. These adjustments do not deviate from the principles of the present invention and are all within the scope of protection of the present invention. Alternatively, the first passage structure 40 can be sleeved on the outside of the evaporator 14, and the heat source passage structure 30 can be sleeved on the outside of the first passage structure 40.

[0045] The following describes the heat exchange structure formed by the intermediate heat exchanger 12 and the second passage structure 41. As one possible embodiment, the intermediate heat exchanger 12 includes a condenser tube connected to the first refrigerant circuit 10 and an evaporator tube connected to the second refrigerant circuit 20. The evaporator tube and the second passage structure 41 form a second double-tube heat exchange structure, with the condenser tube being nested within the second double-tube heat exchange structure. The specific configuration and advantages described above are similar to those of the double-tube heat exchange structure and its functions formed by the first passage structure 40, the evaporator 14, and the heat source passage structure 30, and will not be further described.

[0046] The heat exchange structure formed by the third passage structure 42 and the condenser 22 is described below. The specific heat exchange structure for the third passage structure 42 and the condenser 22 may be a shell-and-tube heat exchanger or a plate heat exchanger, etc. As long as heat exchange between the third passage structure 42 and the condenser 22 is achieved, the present invention does not impose any restrictions on the specific form. Adjustments to these specific forms do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0047] 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.

[0048] For example, as an alternative embodiment, although the intermediate heat exchanger 12 and the second path structure 41 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 second path structure 41 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 second path 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.

[0049] 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 an evaporator in sequence; a second refrigerant circuit, wherein a second compressor, a condenser, a second throttling device and the intermediate heat exchanger are sequentially provided on the second refrigerant circuit; The refrigerants in the first refrigerant circuit and the second refrigerant circuit can exchange heat through the intermediate heat exchanger; Heat source path structure; The first passage structure, the second passage structure and the third passage structure are connected in series, and the heat pump system is configured so that heat exchange can be performed between the first passage structure, the heat source passage structure and the evaporator, the second passage structure can exchange heat with the intermediate heat exchanger, and the third passage structure can exchange heat with the condenser.

2. The heat pump system according to claim 1, characterized in that The heat pump system further includes a flash tank including a water inlet and a steam outlet. The water outlet of the third passage structure is connected to the water inlet. A pressure reducing device is provided between the water outlet of the third passage structure and the water inlet.

3. The heat pump system according to claim 2, characterized in that The flash tank further includes a hot water outlet, which is connected to the water inlet end of the third passage structure.

4. The heat pump system according to claim 2, characterized in that The heat pump system further includes a first water vapor compressor, and the steam outlet is connected to the inlet of the first water vapor compressor.

5. The heat pump system according to claim 4, characterized in that The heat pump system further includes a second water vapor compressor, and an outlet of the first water vapor compressor is connected to an inlet of the second water vapor compressor.

6. The heat pump system according to claim 5, characterized in that 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.

7. The heat pump system according to claim 1, 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 evaporator and the first passage structure are arranged in the heat exchange cavity; or The first passage structure and the evaporator form a first shell-and-tube heat exchange structure, and the heat source passage structure is sleeved on the first shell-and-tube heat exchange structure.

8. The heat pump system according to claim 1, wherein: The intermediate heat exchanger includes a condenser connected to the first refrigerant circuit and an evaporator connected to the second refrigerant circuit. The evaporator and the second passage structure constitute a second shell-and-tube heat exchange structure, and the condenser is sleeved on the second shell-and-tube heat exchange structure.

9. The heat pump system according to claim 1, characterized in that The heat pump system further includes a first water pump, which is used to pump water from the first passage structure to the third passage structure.

10. The heat pump system according to claim 3, characterized in that The hot water outlet is connected to the water inlet of the third passage structure through 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 to the water inlet of the third passage structure.

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