Heat pump system

Abstract

This invention relates to the field of heat pump technology, specifically providing a heat pump system aimed at solving the problem of low operating efficiency in existing heat pump systems. To this end, the heat pump system of this invention includes a first refrigerant circulation loop and a second refrigerant circulation loop. The first refrigerant circulation loop is equipped with a first compressor, a first heat exchanger, a first throttling component, a first intermediate heat exchanger, a second intermediate heat exchanger, and a second heat exchanger. The first and second intermediate heat exchangers are arranged in parallel so that one of them can be selectively connected to the first refrigerant circulation loop. The second refrigerant circulation loop is sequentially equipped with a second compressor, a third heat exchanger, a first intermediate heat exchanger, a second throttling component, and a second intermediate heat exchanger. The heat pump system of this invention, through the arrangement of the first and second intermediate heat exchangers, can selectively adjust the operating state of the first refrigerant circulation loop, thereby improving the operating efficiency of the heat pump system.

Description

Technical Field

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

[0002] With the promotion of energy conservation and emission reduction policies, the application of high-temperature heat pump systems for high-temperature heating in industries such as food processing, textiles, and chemicals is becoming increasingly common. As the demand for industrial heating grows, users are placing increasingly higher demands on high-temperature heat pump systems. Firstly, the final heating temperature of high-temperature heat pump systems generally needs to be greater than 70℃, and in some cases even exceeding 90℃. Secondly, the environmental conditions in which high-temperature heat pump systems are used vary greatly, with outdoor temperatures ranging from -30℃ to 35℃, and high-temperature hot water or hot air must be provided regardless of whether it is winter or summer.

[0003] Specifically, industrial hot water is typically heated to high temperatures, making it difficult for conventional heat pump systems to meet actual heating demands. Cascade heat pump systems, however, offer a mature technology for providing high-temperature hot water. A cascade heat pump system generally consists of a high-pressure refrigerant circulation loop and a low-pressure refrigerant circulation loop, which exchange heat through a shared intermediate heat exchanger to provide high-temperature hot water. However, existing cascade heat pump systems still require cascade operation outside of rated operating conditions, such as when outdoor ambient temperatures are high. This means that even under conditions where the temperature difference between evaporation and condensation is small, two-stage compression is still employed. This configuration lacks flexibility, resulting in significant losses and ultimately low energy efficiency, leading to energy waste.

[0004] Accordingly, there is a need in the field for a new heat pump system to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problems, namely, to solve the problem of low energy efficiency in the operation of existing heat pump systems.

[0006] This invention provides a heat pump system, which includes a first refrigerant circulation loop and a second refrigerant circulation loop.

[0007] The first refrigerant circulation loop is equipped with a first compressor, a first heat exchanger, a first throttling component, a first intermediate heat exchanger, a second intermediate heat exchanger, and a second heat exchanger.

[0008] The first intermediate heat exchanger and the second intermediate heat exchanger are arranged in parallel so that either the first intermediate heat exchanger or the second intermediate heat exchanger can be selectively connected to the first refrigerant circulation loop.

[0009] The second refrigerant circulation loop is sequentially provided with a second compressor, a third heat exchanger, a first intermediate heat exchanger, a second throttling component, and a second intermediate heat exchanger.

[0010] In the preferred embodiment of the heat pump system described above, a three-way valve is also provided on the first refrigerant circulation loop.

[0011] The three-way valve includes one inlet and two outlets. The inlet of the three-way valve is connected to the main circuit of the first refrigerant circulation loop, the first outlet of the three-way valve is connected to the first intermediate heat exchanger, and the second outlet of the three-way valve is connected to the second intermediate heat exchanger.

[0012] In the preferred technical solution of the above-mentioned heat pump system, the second intermediate heat exchanger is a three-medium heat exchanger.

[0013] In the preferred embodiment of the above-mentioned heat pump system, the heat pump system further includes a first hot water exchange circuit.

[0014] A portion of the first hot water exchange circuit is disposed in the three-medium heat exchanger so that the water flowing in the first hot water exchange circuit, the refrigerant flowing in the first refrigerant circulation loop, and the refrigerant flowing in the second refrigerant circulation loop can exchange heat in the three-medium heat exchanger.

[0015] In the preferred embodiment of the above-mentioned heat pump system, the heat pump system further includes a first bypass branch.

[0016] The first bypass branch is connected to the first refrigerant circulation loop, and the first end of the first bypass branch is connected to the inlet of the second heat exchanger, and the second end of the first bypass branch is connected to the outlet of the second heat exchanger.

[0017] In the preferred embodiment of the above heat pump system, a first bypass valve is provided on the first bypass branch.

[0018] In the preferred embodiment of the above-mentioned heat pump system, the heat pump system further includes a second bypass branch.

[0019] The second bypass branch is connected to the second refrigerant circulation loop, and the first end of the second bypass branch is connected between the first intermediate heat exchanger and the third heat exchanger, and the second end of the second bypass branch is connected between the first intermediate heat exchanger and the second throttling member.

[0020] In the preferred embodiment of the above-mentioned heat pump system, a second bypass valve is provided on the second bypass branch.

[0021] In the preferred embodiment of the above-mentioned heat pump system, the heat pump system further includes a second hot water exchange circuit.

[0022] A portion of the second hot water exchange circuit is disposed in the first heat exchanger so that the water flowing in the second hot water exchange circuit can exchange heat with the refrigerant flowing in the first refrigerant circulation loop through the first heat exchanger.

[0023] In the preferred embodiment of the above-mentioned heat pump system, the heat pump system further includes a third hot water exchange circuit.

[0024] A portion of the third hot water exchange circuit is disposed in the third heat exchanger so that the water flowing in the third hot water exchange circuit can exchange heat with the refrigerant flowing in the second refrigerant circulation loop through the third heat exchanger.

[0025] By adopting the above technical solution, the heat pump system of the present invention, through the first intermediate heat exchanger and the second intermediate heat exchanger arranged in parallel, can selectively adjust the operating state of the first refrigerant circulation loop, maximize the utilization of energy, and effectively improve the operating energy efficiency of the heat pump system. Attached Figure Description

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a schematic diagram of the heat pump system of the present invention;

[0028] Figure label:

[0029] 1. First refrigerant circulation loop; 11. First compressor; 12. First heat exchanger; 13. First throttling component; 14. First intermediate heat exchanger; 15. Second intermediate heat exchanger; 16. Second heat exchanger; 17. Three-way valve;

[0030] 2. Second refrigerant circulation loop; 21. Second compressor; 22. Third heat exchanger; 23. Second throttling component;

[0031] 3. First, replace the hot water circuit;

[0032] 4. First bypass branch; 41. First bypass valve;

[0033] 5. Second bypass branch; 51. Second bypass valve;

[0034] 6. Replace the hot water circuit for the second time;

[0035] 7. Replace the hot water circuit. Detailed Implementation

[0036] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, the heat pump system described in this invention can be a residential heat pump system or an industrial heat pump system; this is not limiting. Those skilled in the art can determine the application of the heat pump system of this invention according to actual usage requirements. Such changes in application do not depart from the basic principles of the invention and fall within the scope of protection of the invention.

[0037] It should be noted that, in the description of this preferred embodiment, unless otherwise explicitly specified and limited, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "connected" and "linked" should be interpreted broadly; for example, they can refer to mechanical connections or electrical connections, direct connections or indirect connections via an intermediate medium, or connections within two components. Therefore, they should not be construed as limiting the invention. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] See Figure 1 , Figure 1 This is a schematic diagram of the heat pump system of the present invention. Figure 1 As shown, the heat pump system of the present invention includes a first refrigerant circulation loop 1 and a second refrigerant circulation loop 2. The first refrigerant circulation loop 1 is equipped with a first compressor 11, a first heat exchanger 12, a first throttling component 13, a first intermediate heat exchanger 14, a second intermediate heat exchanger 15, and a second heat exchanger 16. The first intermediate heat exchanger 14 and the second intermediate heat exchanger 15 are arranged in parallel so that one of them can be selectively connected to the first refrigerant circulation loop 1. The second refrigerant circulation loop 2 is equipped with a second compressor 21, a third heat exchanger 22, a first intermediate heat exchanger 14, a second throttling component 23, and a second intermediate heat exchanger 15. Based on the above structural configuration, the heat pump system of the present invention can selectively adjust the operating state of the first refrigerant circulation loop 1 by using the parallel arrangement of the first intermediate heat exchanger 14 and the second intermediate heat exchanger 15, maximizing energy utilization and effectively improving the operating energy efficiency of the heat pump system.

[0039] It should be noted that the present invention does not impose any restrictions on the specific type of refrigerant flowing in the first refrigerant circulation loop 1 and the second refrigerant circulation loop 2. Those skilled in the art can set the type according to the actual situation. As a specific embodiment, the refrigerant in the first refrigerant circulation loop 1 is refrigerant R134a, and the refrigerant in the second refrigerant circulation loop 2 is refrigerant R410A.

[0040] Furthermore, it should be noted that the present invention does not impose any limitations on the specific structure of the first intermediate heat exchanger 14 and the second intermediate heat exchanger 15. They can be shell-and-tube heat exchangers or plate heat exchangers, and those skilled in the art can set them according to the actual situation. In this specific embodiment, the first intermediate heat exchanger 14 is preferably a plate heat exchanger, and the second intermediate heat exchanger 15 is a three-medium heat exchanger, so as to effectively improve the heat exchange efficiency of the heat pump system.

[0041] In a preferred embodiment of the first intermediate heat exchanger 14, the first intermediate heat exchanger 14 includes a shell and a first heat exchange channel and a second heat exchange channel disposed within the shell. A first refrigerant circulation loop 1 is connected to the first heat exchange channel, allowing refrigerant in the first refrigerant circulation loop 1 to flow through the first heat exchange channel. A second refrigerant circulation loop 2 is connected to the second heat exchange channel, allowing refrigerant in the second refrigerant circulation loop 2 to flow through the second heat exchange channel. In a further preferred embodiment, the first heat exchange channel and the second heat exchange channel are staggered, and the shell is filled with a heat exchange medium to effectively improve the heat exchange efficiency of the first refrigerant circulation loop 1 and the second refrigerant circulation loop 2.

[0042] In a preferred configuration of the second intermediate heat exchanger 15, the second intermediate heat exchanger 15 includes a first channel, a second channel, and a third channel. The refrigerant in the first refrigerant circulation loop 1 flows through the first channel, the refrigerant in the second refrigerant circulation loop 2 flows through the second channel, and the water or air used for heat exchange flows through the third channel. The first channel, the second channel, and the third channel are arranged alternately so that the refrigerant in the first refrigerant circulation loop 1, the refrigerant in the second refrigerant circulation loop 2, and the water or air can exchange heat with each other.

[0043] Furthermore, it should be noted that the present invention does not impose any restrictions on the specific structure and model of the first compressor 11, the second compressor 21, the first throttling component 13, the second throttling component 23, the first heat exchanger 12, the second heat exchanger 16, and the third heat exchanger 22; the first compressor 11 and the second compressor 21 can be variable frequency compressors or fixed frequency compressors. Preferably, the first compressor 11 and the second compressor 21 are variable frequency compressors to control the operating state of the heat pump system; the first throttling component 13 and the second throttling component 23 can be electronic expansion valves, capillary tubes, or thermostatic expansion valves; the first heat exchanger 12, the second heat exchanger 16, and the third heat exchanger 22 can be plate heat exchangers or shell-and-tube heat exchangers. These are not limiting, and those skilled in the art can set them according to the actual situation.

[0044] Furthermore, a three-way valve 17 is also provided on the first refrigerant circulation loop 1. The three-way valve 17 includes an inlet ( Figure 1 The three-way valve 17 has two outlets, with its inlet connected to the main circuit of the first refrigerant circulation loop 1 and its first outlet (a). Figure 1 The middle port (b) is connected to the first intermediate heat exchanger 14, and the second outlet of the three-way valve 17 ( Figure 1 The three-way valve 17 (port a) is connected to the second intermediate heat exchanger 15. The three-way valve 17 is configured to selectively connect the first intermediate heat exchanger 14 and the second intermediate heat exchanger 15 into the first refrigerant circulation loop 1 by controlling its own connection state. Specifically, when port a of the three-way valve 17 is connected to port b, the first intermediate heat exchanger 14 is connected to the first refrigerant circulation loop 1; when port a of the three-way valve 17 is connected to port c, the second intermediate heat exchanger 15 is connected to the first refrigerant circulation loop 1. It should be noted that this invention does not impose any limitations on the specific structure or type of the three-way valve 17; those skilled in the art can set it according to actual conditions.

[0045] Preferably, in this specific embodiment, the heat pump system further includes a first hot water exchange path 3, a portion of which is disposed in the three-medium heat exchanger, so that the water flowing in the first hot water exchange path 3, the refrigerant flowing in the first refrigerant circulation loop 1, and the refrigerant flowing in the second refrigerant circulation loop 2 can exchange heat in the three-medium heat exchanger. The first hot water exchange path 3 is used to produce cold water, suitable for cold recovery scenarios.

[0046] Furthermore, the heat pump system also includes a first bypass branch 4, which is connected to the first refrigerant circulation loop 1. The first end of the first bypass branch 4 is connected to the inlet of the second heat exchanger 16, and the second end of the first bypass branch 4 is connected to the outlet of the second heat exchanger 16. A first bypass valve 41 is provided on the first bypass branch 4.

[0047] Based on the configuration of the first bypass branch 4 and the first bypass valve 41, the heat pump system can selectively connect the second heat exchanger 16 to the first refrigerant circulation loop 1, thereby further facilitating the heat pump system to adjust its operating status according to the actual operating conditions and improve its operating efficiency.

[0048] In addition, the heat pump system also includes a second bypass branch 5, which is connected to the second refrigerant circulation loop 2. The first end of the second bypass branch 5 is connected between the first intermediate heat exchanger 14 and the third heat exchanger 22, and the second end of the second bypass branch 5 is connected between the first intermediate heat exchanger 14 and the second throttling member 23. A second bypass valve 51 is provided on the second bypass branch 5.

[0049] Based on the configuration of the second bypass branch 5 and the second bypass valve 51, the heat pump system can selectively adjust the operating state of the second refrigerant circulation loop 2, thereby further improving the operating energy efficiency of the heat pump system.

[0050] It should be noted that the present invention does not impose any restrictions on the specific structure and type of the first bypass valve 41 and the second bypass valve 51. The first bypass valve 41 and the second bypass valve 51 can be hydraulic control valves or electromagnetic control valves. These are not restrictive and can be set by those skilled in the art according to the actual situation.

[0051] More preferably, a first gas separator (not shown in the figure) is also provided on the first refrigerant circulation loop 1, and the first gas separator is located at the air inlet of the first compressor 11. A second gas separator (not shown in the figure) is also provided on the second refrigerant circulation loop 2, and the second gas separator is located at the air inlet of the second compressor 21. The first gas separator and the second gas separator can effectively avoid the problem of liquid slugging in the first compressor 11 and the second compressor 21, and effectively ensure the service life of the first compressor 11 and the second compressor 21. It should be noted that the present invention does not impose any limitations on the specific structure of the first gas separator and the second gas separator, and those skilled in the art can set them according to the actual situation.

[0052] In addition, in this preferred embodiment, the heat pump system further includes a second hot water exchange path 6, a portion of which is disposed in the first heat exchanger 12, so that the water flowing in the second hot water exchange path 6 can exchange heat with the refrigerant flowing in the first refrigerant circulation loop 1 through the first heat exchanger 12.

[0053] Furthermore, the heat pump system also includes a third hot water exchange path 7, a portion of which is disposed in the third heat exchanger 22, so that the water flowing in the third hot water exchange path 7 can exchange heat with the refrigerant flowing in the second refrigerant circulation loop 2 through the third heat exchanger 22.

[0054] Based on the configuration of the first hot water exchange circuit 3, the second hot water exchange circuit 6, and the third hot water exchange circuit 7, the heat pump system of the present invention can simultaneously produce water at three different temperatures. Specifically, the first hot water exchange circuit 3 can produce cold water, the second hot water exchange circuit 6 can produce high-temperature water, and the third hot water exchange circuit 7 can produce medium-temperature water. Therefore, the heat pump system of the present invention can meet different user needs and enhance the user experience while maintaining high-efficiency operation.

[0055] It should be noted that the present invention does not impose any restrictions on other structures provided on the first hot water exchange circuit 3, the second hot water exchange circuit 6, and the third hot water exchange circuit 7; for example, water tanks can be provided on the first hot water exchange circuit 3, the second hot water exchange circuit 6, and the third hot water exchange circuit 7; of course, this is not restrictive, and those skilled in the art can set other structures on the first hot water exchange circuit 3, the second hot water exchange circuit 6, and the third hot water exchange circuit 7 according to the actual situation.

[0056] Based on the above structural configuration, the operating mode of the heat pump system of the present invention is as follows:

[0057] 1. The heat pump system operates in single-stage mode:

[0058] Specifically, when the heat pump system can meet the user's need to produce high-temperature water by operating in single-stage mode, in order to ensure the optimal operating efficiency of the heat pump system, ports a and c of the three-way valve 17 are connected, while ports a and b are not connected. That is, the three-way valve 17 is connected to the second intermediate heat exchanger 15, but not to the first intermediate heat exchanger 14. Furthermore, the first bypass valve 41 is closed, and the second heat exchanger 16 is connected to the first refrigerant circulation loop 1.

[0059] The refrigerant circulation path of the heat pump system is as follows: the refrigerant in the first refrigerant circulation loop 1 is discharged from the exhaust port of the first compressor 11 and enters the first heat exchanger 12. After being throttled and depressurized by the first throttling component 13, it flows through the a port and c port of the three-way valve 17 and enters the second intermediate heat exchanger 15. Then, the refrigerant flows out from the second heat exchanger 16 and returns to the first compressor 11 through the first gas separator via the air inlet of the first compressor 11, completing one refrigerant cycle.

[0060] When the heat pump system operates in single-stage mode, the water in the first heat exchanger circuit 3 exchanges heat with the refrigerant in the first refrigerant circulation loop 1 in the second intermediate heat exchanger 15, and cold water can be produced through the first heat exchanger circuit 3 for use in cold recovery scenarios; the water in the second heat exchanger circuit 6 exchanges heat with the refrigerant in the first refrigerant circulation loop 1 in the first heat exchanger 12, and the user can produce hot water through the second heat exchanger circuit 6.

[0061] 2. The heat pump system operates in a dual single-stage mode:

[0062] Specifically, when the heat pump system cannot produce high-temperature water in single-stage mode, and the required high-temperature water temperature is not excessively high, the heat pump system operates in dual single-stage mode. In this mode, ports a and c of the three-way valve 17 are connected, while ports a and b are not connected. That is, the three-way valve 17 is connected to the second intermediate heat exchanger 15, but not to the first intermediate heat exchanger 14. Furthermore, the first bypass valve 41 is closed, the second bypass valve 51 is opened, and the second heat exchanger 16 is connected to the first refrigerant circulation loop 1.

[0063] The refrigerant circulation path of the heat pump system is as follows: the refrigerant in the first refrigerant circulation loop 1 is discharged from the exhaust port of the first compressor 11 and enters the first heat exchanger 12. After being throttled and depressurized by the first throttling component 13, it flows through the a port and c port of the three-way valve 17 and enters the second intermediate heat exchanger 15. Then, the refrigerant flows out from the second heat exchanger 16 and returns to the first compressor 11 through the first gas separator and the air inlet of the first compressor 11, completing one refrigerant cycle.

[0064] Another refrigerant circulation path of the heat pump system is as follows: the refrigerant in the second refrigerant circulation loop 2 is discharged from the exhaust port of the second compressor 21 and enters the third heat exchanger 22. Then, it passes through the second bypass valve 51 and enters the second throttling component 23 for throttling and pressure reduction. After throttling and pressure reduction, the refrigerant enters the second intermediate heat exchanger 15 and passes through the second gas separator. Then, it returns to the second compressor 21 from the air inlet of the second compressor 21, completing one refrigerant cycle.

[0065] When the heat pump system operates in dual single-stage mode, the water in the first heat exchanger circuit 3 exchanges heat with the refrigerant in the first refrigerant circulation loop 1 and the refrigerant in the second refrigerant circulation loop 2 in the second intermediate heat exchanger 15, and cold water is produced through the first heat exchanger circuit 3 for use in cold recovery scenarios; the water in the second heat exchanger circuit 6 exchanges heat with the refrigerant in the first refrigerant circulation loop 1 in the first heat exchanger 12, and users can produce high-temperature water through the second heat exchanger circuit 6; the water in the third heat exchanger circuit 7 exchanges heat with the refrigerant in the second refrigerant circulation loop 2 in the third heat exchanger 22, and users can produce medium-temperature water through the third heat exchanger circuit 7.

[0066] 3. The heat pump system operates in cascade mode:

[0067] Specifically, when the heat pump system cannot meet the user's need to produce high-temperature water in single-stage or dual-single-stage mode, and the required high-temperature water temperature is high, the heat pump system operates in cascade mode.

[0068] At this time, ports a and b of the three-way valve 17 are connected, while ports a and c are not connected. That is, the three-way valve 17 is not connected to the second intermediate heat exchanger 15, but is connected to the first intermediate heat exchanger 14. Furthermore, the first bypass valve 41 is opened, the second bypass valve 51 is closed, and the second heat exchanger 16 is not connected to the first refrigerant circulation loop 1.

[0069] The refrigerant circulation path of the heat pump system is as follows: the refrigerant in the first refrigerant circulation loop 1 is discharged from the exhaust port of the first compressor 11 and enters the first heat exchanger 12. After being throttled and depressurized by the first throttling component 13, it flows through the a port and b port of the three-way valve 17 and enters the first intermediate heat exchanger 14. Then, the refrigerant flows out from the first bypass valve 41 and returns to the first compressor 11 through the first gas separator via the air inlet of the first compressor 11, completing one refrigerant cycle.

[0070] Another refrigerant circulation path of the heat pump system is as follows: the refrigerant in the second refrigerant circulation loop 2 is discharged from the exhaust port of the second compressor 21 and enters the third heat exchanger 22. Then it passes through the first intermediate heat exchanger 14 and enters the second throttling component 23 for throttling and pressure reduction. After throttling and pressure reduction, the refrigerant enters the second intermediate heat exchanger 15 and passes through the second gas separator. Then it returns to the second compressor 21 from the air inlet of the second compressor 21, completing one refrigerant cycle.

[0071] When the heat pump system operates in cascade mode, the refrigerant in the first refrigerant circulation loop 1 exchanges heat with the refrigerant in the second refrigerant circulation loop 2 through the first intermediate heat exchanger 14; the water in the first hot water exchange circuit 3 exchanges heat with the refrigerant in the first refrigerant circulation loop 1 and the refrigerant in the second refrigerant circulation loop 2 through the second intermediate heat exchanger 15, and cold water is produced through the first hot water exchange circuit 3 for use in cold recovery scenarios; the water in the second hot water exchange circuit 6 exchanges heat with the refrigerant in the first refrigerant circulation loop 1 through the first heat exchanger 12, and users can produce high-temperature water through the second hot water exchange circuit 6; the water in the third hot water exchange circuit 7 exchanges heat with the refrigerant in the second refrigerant circulation loop 2 through the third heat exchanger 22, and users can produce medium-temperature water through the third hot water exchange circuit 7.

[0072] It should be noted that the present invention does not impose any restrictions on the specific use of the heat pump system. Those skilled in the art will understand that the operating modes of the heat pump system of the present invention are not limited to the above three. Those skilled in the art can adjust the operating modes of the heat pump system according to the actual situation.

[0073] The technical solution of the present invention has been described above with reference to 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 can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A heat pump system, characterized by, The heat pump system includes a first refrigerant circulation loop and a second refrigerant circulation loop. The first refrigerant circulation loop is equipped with a first compressor, a first heat exchanger, a first throttling component, a first intermediate heat exchanger, a second intermediate heat exchanger, and a second heat exchanger. The first intermediate heat exchanger and the second intermediate heat exchanger are arranged in parallel so that either the first intermediate heat exchanger or the second intermediate heat exchanger can be selectively connected to the first refrigerant circulation loop. The second refrigerant circulation loop is sequentially provided with a second compressor, a third heat exchanger, a first intermediate heat exchanger, a second throttling component, and a second intermediate heat exchanger; The heat pump system also includes a second bypass branch. The second bypass branch is connected to the second refrigerant circulation loop, and the first end of the second bypass branch is connected between the first intermediate heat exchanger and the third heat exchanger, and the second end of the second bypass branch is connected between the first intermediate heat exchanger and the second throttling member. A second bypass valve is provided on the second bypass branch.

2. The heat pump system of claim 1, wherein, A three-way valve is also installed on the first refrigerant circulation loop. The three-way valve includes one inlet and two outlets. The inlet of the three-way valve is connected to the main circuit of the first refrigerant circulation loop, the first outlet of the three-way valve is connected to the first intermediate heat exchanger, and the second outlet of the three-way valve is connected to the second intermediate heat exchanger.

3. The heat pump system of claim 1, wherein, The second intermediate heat exchanger is a three-medium heat exchanger.

4. The heat pump system of claim 3, wherein, The heat pump system also includes a first hot water exchange circuit. A portion of the first hot water exchange circuit is disposed in the three-medium heat exchanger so that the water flowing in the first hot water exchange circuit, the refrigerant flowing in the first refrigerant circulation loop, and the refrigerant flowing in the second refrigerant circulation loop can exchange heat in the three-medium heat exchanger.

5. The heat pump system according to claim 1, characterized in that, The heat pump system also includes a first bypass branch. The first bypass branch is connected to the first refrigerant circulation loop, and the first end of the first bypass branch is connected to the inlet of the second heat exchanger, and the second end of the first bypass branch is connected to the outlet of the second heat exchanger.

6. The heat pump system according to claim 5, characterized in that, A first bypass valve is provided on the first bypass branch.

7. The heat pump system according to any one of claims 1 to 6, characterized in that, The heat pump system also includes a second hot water exchange circuit. A portion of the second hot water exchange circuit is disposed in the first heat exchanger so that the water flowing in the second hot water exchange circuit can exchange heat with the refrigerant flowing in the first refrigerant circulation loop through the first heat exchanger.

8. The heat pump system according to any one of claims 1 to 6, characterized in that, The heat pump system also includes a third hot water exchange circuit. A portion of the third hot water exchange circuit is disposed in the third heat exchanger so that the water flowing in the third hot water exchange circuit can exchange heat with the refrigerant flowing in the second refrigerant circulation loop through the third heat exchanger.

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