Heat pump unit

Abstract

The application provides a heat pump unit, comprising a compressor, first and second reversing valves, first, second and third heat exchangers and a shared unit part in different working modes. Any two heat exchangers are communicated with the compressor through the first and second reversing valves. The first interface of the first reversing valve is connected with the exhaust port of the compressor, the second interface of the first reversing valve is connected with the first interface of the second reversing valve, the third interface of the first reversing valve and the third interface of the second reversing valve are connected with the suction port of the compressor, the fourth interface of the first reversing valve is connected with the first port of the third heat exchanger, the second interface of the second reversing valve is connected with the first port of the first heat exchanger, the fourth interface of the second reversing valve is connected with the second port of the second heat exchanger, the first end of the shared unit part is connected between the second port of the first heat exchanger and the second port of the third heat exchanger, and the second end is connected between the second port of the first heat exchanger and the first port of the second heat exchanger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, and in particular to a heat pump unit. BACKGROUND

[0002] Four-way heat pump units are favored by customers in the market because they integrate refrigeration, heating, heat recovery and other functions. At present, many enterprises have launched similar products. However, because of different technical backgrounds and focus directions, the capacity and efficiency of the four-way products launched by each company have a certain energy-saving effect, but compared with heat pump units without four-way function, the capacity and efficiency of the units are greatly reduced. SUMMARY

[0003] The purpose of the present application is to provide a heat pump unit that can improve the capacity and efficiency of the unit.

[0004] One aspect of the present application provides a heat pump unit. The heat pump unit includes a compressor, a first reversing valve, a second reversing valve, a first heat exchanger, a second heat exchanger and a third heat exchanger. Any two of the first heat exchanger, the second heat exchanger and the third heat exchanger are connected to the compressor through the first reversing valve and the second reversing valve to make the heat pump unit operate in different working modes. The heat pump unit also includes a shared unit part in different working modes, the first reversing valve and the second reversing valve have a first interface, a second interface, a third interface and a fourth interface, the first interface of the first reversing valve is connected to the exhaust port of the compressor, the second interface of the first reversing valve is connected to the first interface of the second reversing valve, the third interface of the first reversing valve and the third interface of the second reversing valve are connected to the suction port of the compressor, the fourth interface of the first reversing valve is connected to the first port of the third heat exchanger, the second interface of the second reversing valve is connected to the first port of the first heat exchanger, and the fourth interface of the second reversing valve is connected to the second port of the second heat exchanger. The shared unit part has a first end and a second end, the first end of the shared unit part is connected between the second port of the first heat exchanger and the second port of the third heat exchanger, and the second end of the shared unit part is connected between the second port of the first heat exchanger and the first port of the second heat exchanger.

[0005] The heat pump unit of the present application embodiment is more convenient to switch when operating in different modes.

[0006] In addition, the heat pump unit of the present application embodiment can improve the capacity and efficiency of the unit while improving the operation reliability. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 FIG. 1 is a schematic diagram of a heat pump unit according to an embodiment of the present application operating in a heating mode;

[0008] Figure 2 A schematic diagram of a heat pump unit according to an embodiment of the application operating in a heating mode;

[0009] Figure 3 A schematic diagram of a heat pump unit according to an embodiment of the application operating in a heat recovery mode;

[0010] Figure 4 A schematic diagram of a heat pump unit according to an embodiment of the application operating in a defrost mode. DETAILED DESCRIPTION

[0011] The detailed description set forth below in connection with the appended drawings describes exemplary embodiments and does not represent all embodiments in accordance with this application. The following description is presented for the purpose of illustrating one or more aspects of the application and is not intended to limit the application in any manner. The application, as described in the claims, is capable of other embodiments and is defined by the appended claims.

[0012] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical terms or scientific terms used in the present application are intended to have the meanings commonly understood by one of ordinary skill in the art. The detailed description set forth below in connection with the appended drawings describes exemplary embodiments and does not represent all embodiments in accordance with this application. The following description is presented for the purpose of illustrating one or more aspects of the application and is not intended to limit the application in any manner. The application, as described in the claims, is capable of other embodiments and is defined by the appended claims.

[0013] An embodiment of the application provides a heat pump unit 1.Figure 1 A schematic diagram illustrating a heat pump unit 1 operating in cooling mode according to an embodiment of this application is shown. Figure 1 As shown, a heat pump unit 1 according to one embodiment of this application includes a compressor 10, a first reversing valve RV1, a second reversing valve RV2, a first heat exchanger 31, a second heat exchanger 32, and a third heat exchanger 33. The compressor 10 has an exhaust port 11 and an intake port 12. The first reversing valve RV1 and the second reversing valve RV2 have a first port D, a second port C, a third port S, and a fourth port E. Specifically, the first port D of the first reversing valve RV1 is connected to the exhaust port 11 of the compressor 10; the second port C of the first reversing valve RV1 is connected to the first port D of the second reversing valve RV2; the third port S of the first reversing valve RV1 and the third port S of the second reversing valve RV2 are connected to the intake port 12 of the compressor 10; and the fourth port E of the first reversing valve RV1 is connected to the first port 331 of the third heat exchanger 33. The second port C of the second reversing valve RV2 is connected to the first port 311 of the first heat exchanger 31, and the fourth port E of the second reversing valve RV2 is connected to the second port 322 of the second heat exchanger 32. By using the first reversing valve RV1 and the second reversing valve RV2, any two of the first heat exchangers 31, the second heat exchanger 32 and the third heat exchanger 33 can be connected to the compressor 10, thereby enabling the heat pump unit 1 to operate in different working modes.

[0014] The heat pump unit 1 of this application embodiment may further include a shared unit section 40 in different operating modes. The shared unit section 40 has a first end 401 and a second end 402. The first end 401 of the shared unit section 40 is connected between the first port 312 of the first heat exchanger 31 and the second port 332 of the third heat exchanger 33, and the second end 402 of the shared unit section 40 is connected between the first port 312 of the first heat exchanger 31 and the first port 321 of the second heat exchanger 32.

[0015] The heat pump unit 1 of this application embodiment omits the gas-liquid separator in the suction line of the compressor 10, thereby reducing the suction pressure drop.

[0016] The heat pump unit 1 in this embodiment of the application is more convenient to switch between different modes of operation.

[0017] In addition, the heat pump unit 1 of the present application embodiment can improve the unit's capacity and efficiency, while also improving operational reliability.

[0018] In some embodiments, the first heat exchanger 31 is an air-cooled heat exchanger, and the second heat exchanger 32 and the third heat exchanger 33 are water-cooled heat exchangers. In one embodiment, the first heat exchanger 31 may, for example, include a finned heat exchanger, and the first heat exchanger 31 may include one or more finned heat exchangers; the second heat exchanger 32 may, for example, include a shell-and-tube heat exchanger, and the third heat exchanger 33 may, for example, include a brazed plate heat exchanger (BPHE).

[0019] In some embodiments, the heat pump unit 1 of the present application further includes an oil separator 20. The inlet of the oil separator 20 is connected to the exhaust port 11 of the compressor 10, the outlet of the oil separator 20 is connected to the first interface D of the first reversing valve RV1, and the oil outlet of the oil separator 20 is connected to the oil outlet 13 of the compressor 10. The oil separator 20 is used to separate the lubricating oil in the refrigerant discharged from the exhaust port 11 of the compressor 10.

[0020] In some embodiments, a first solenoid valve SV1 is connected between the third interface S of the first reversing valve RV1 and the third interface S of the second reversing valve RV2. The first solenoid valve SV1 is a special-purpose suction solenoid valve. In consideration of the possibility of internal leakage of the reversing valve itself back to the suction side, the first solenoid valve SV1 is arranged between the return air ports of the first reversing valve RV1 and the second reversing valve RV2, and is connected or disconnected as needed to reduce the risk of direct short-circuiting of the refrigerant exhaust back to the suction side.

[0021] In some embodiments, the heat pump unit 1 of the present application further includes a liquid accumulator 50, and the shared unit portion 40 includes a shared main fluid line 41 that passes through the liquid accumulator 50. The refrigerant in the shared main fluid line 41 and the refrigerant in the housing of the liquid accumulator 50 are not in communication with each other.

[0022] In different modes of steady-state operation of the heat pump unit 1 of the embodiments of the present application, the liquid accumulator 50 component is bypassed and does not participate in the work. Thus, the amount of system refrigerant charge is reduced.

[0023] In addition, the heat pump unit 1 of the present application has a shared main fluid line 41 in the liquid accumulator 50 that can be used in different modes. Thus, when starting at low temperature or operating at low temperature, the refrigerant in the shared main fluid line 41 at the high-temperature side can be used to heat the refrigerant in the housing of the liquid accumulator 50, thereby increasing the pressure on the housing side of the liquid accumulator 50, which is beneficial for refrigerant management (discharge) and reduces the risk of failure during startup or operation, such as low pressure, oil loss, and other failure problems.

[0024] In some embodiments, the sharing unit 40 of the present application can further comprise a drying filter 42 and a sub-cooler 43. One end of the sharing main fluid line 41 is connected to the first end 401, the other end of the sharing main fluid line 41 is connected to the inlet of the drying filter 42, the outlet of the drying filter 42 is connected to the inlet of the main line of the sub-cooler 43, and the outlet of the main line of the sub-cooler 43 is connected to the second end 402.

[0025] In some embodiments, the inlet of the auxiliary line of the sub-cooler 43 is connected to the inlet of the main line through a fourth expansion valve EXV4, and the outlet of the auxiliary line of the sub-cooler 43 is connected to the suction port 12 of the compressor 10.

[0026] In some embodiments, the heat pump unit 1 of the present application further comprises a first branch. The first branch is connected between the outlet of the drying filter 42 and the first interface 51 of the liquid accumulator 50, and the first branch can comprise a second solenoid valve SV2 and a first check valve CV1 connected in series. Thus, during the operation of the heat pump unit 1 of the present application, when the amount of refrigerant in the system main line increases, the second solenoid valve SV2 can be opened to recover the excess amount of refrigerant into the liquid accumulator 50.

[0027] In some embodiments, the heat pump unit 1 of the present application further comprises a second branch, a third branch and a fourth branch. The second branch is connected between the second interface 52 of the liquid accumulator 50 and the third port 323 of the second heat exchanger 32, and the second branch can comprise a third solenoid valve SV3 and a second check valve CV2 connected in series. The third branch is connected between the second interface 52 of the liquid accumulator 50 and the second port 312 of the first heat exchanger 31, and the third branch can comprise a fourth solenoid valve SV4 and a third check valve CV3 connected in series. The fourth branch is connected between the second interface 52 of the liquid accumulator 50 and the second port 332 of the third heat exchanger 33, and the fourth branch can comprise a fourth solenoid valve SV4 and a fourth check valve CV4 connected in series. Thus, during the operation of the heat pump unit 1 of the present application, when the operating condition changes and the system circulation amount increases, the amount of refrigerant in the operating main circuit is insufficient, the corresponding second solenoid valve SV2, third solenoid valve SV3 or fourth solenoid valve SV4 can be opened to release a part of the refrigerant from the liquid accumulator 50 to the operating main circuit, thereby facilitating the adjustment of the amount of refrigerant in the operating main circuit.

[0028] In one embodiment, a filter 61 can be provided between the connection of the third solenoid valve SV3 and the fourth solenoid valve SV4 and the second interface 52 of the liquid accumulator 50, for filtering out impurities in the refrigerant released from the liquid accumulator 50.

[0029] The second end 402 of the sharing unit part 40 is connected to the first port 321 of the second heat exchanger 32 through the first throttling valve EXV1, the second end 402 of the sharing unit part 40 is connected to the first port 312 of the first heat exchanger 31 through the second throttling valve EXV2, and the second end 402 of the sharing unit part 40 is connected to the second port 332 of the third heat exchanger 33 through the third throttling valve EXV3.

[0030] The heat pump unit 1 of the present application does not set other check valves or solenoid valves after the first throttling valve EXV1, the second throttling valve EXV2 and the third throttling valve EXV3, so that the resistance loss can be reduced and the refrigerant gas flashing can be reduced.

[0031] The first port 312 of the first heat exchanger 31 is connected to the first end 401 of the sharing unit part 40 through the fifth check valve CV5, and the second port 332 of the third heat exchanger 33 is connected to the first end 401 of the sharing unit part 40 through the sixth check valve CV6.

[0032] In some embodiments, in order to prevent the refrigerant in the tank of the accumulator 50 from being too much, which causes the safety problem of the accumulator 50 due to the temperature change in the tank of the accumulator 50, a seventh check valve CV7 is further connected between the first interface 51 of the accumulator 50 and the inlet of the dry filter 42. Thus, when the refrigerant in the tank of the accumulator 50 is too much, the excess refrigerant can be discharged back to the main circuit through the seventh check valve CV7. In an embodiment, a filter 62 can be further provided upstream of the seventh check valve CV7, i.e. between the first interface 51 of the accumulator 50 and the seventh check valve CV7, for filtering out impurities in the refrigerant released from the accumulator 50 to prevent the seventh check valve CV7 from being blocked.

[0033] The heat pump unit 1 of the present application can include a refrigeration mode, a heating mode, a heat recovery mode and a defrosting mode. In the illustration of the present application, the thick solid line part represents the main path of the main side refrigerant working, the medium thick solid line part represents the auxiliary path of the main side refrigerant working, and the dashed line part represents not participating in the working.

[0034] Table 1 below shows the action of each valve when the heat pump unit 1 of the present application is operated in different modes.

[0035] Table 1

[0036] Cooling mode Heating mode Heat recovery mode Defrost mode RV1 Off On On Off RV2 Off On Off Off SV1 Off Off Off On SV2 Off / On Off / On Off / On Off / On SV3 Off / On Off Off / On Off SV4 Off Off / On Off Off / On EXV1 On Off On Off EXV2 Off On Off Off EXV3 Off Off Off On

[0037] In the table above, for RV1 and RV2, Off means the coil is not energized when the valve is working, and On means the coil is energized when the valve is working; for SV1-SV4 and EXV1-EXV3, Off means the valve is closed (i.e., not energized when the valve is not working), On means the valve is open (i.e., energized when the valve is working), and Off / On means the valve is not energized when it is not working, and energized when it is working, opening or closing as needed.

[0038] The following will refer to respectively Figures 1 to 4 The flow of refrigerant in the heat pump unit 1 of this application embodiment under various operating modes will be described in detail with reference to Table 1.

[0039] like Figure 1 Referring to Table 1, when the heat pump unit 1 of this embodiment is operating in cooling mode, the coils in the first reversing valve RV1 and the second reversing valve RV2 are not energized; the first throttle valve EXV1 is a cooling throttle valve, and it is open, while the second throttle valve EXV2 and the third throttle valve EXV3 are both closed; the first solenoid valve SV1 is closed. In cooling mode, the flow direction of the refrigerant is as follows: the refrigerant flows from the exhaust port 11 of the compressor 10 and the oil separator 20 through the first reversing valve RV1. At this time, the coil of the first reversing valve RV1 is not energized, and the first port D and the second port C of the first reversing valve RV1 are connected. The refrigerant flows through the first port D and the second port C of the first reversing valve RV1 through the second reversing valve RV2. At this time, the coil of the second reversing valve RV2 is not energized, and the first port D and the second port C of the second reversing valve RV2 are connected. The refrigerant flows through the first port D and the second port C of the second reversing valve RV2 through the first port D and the second port C of the second reversing valve RV2. The refrigerant flows through the first heat exchanger 31, the fifth one-way valve CV5, the shared main fluid pipeline 41 that runs through the liquid receiver 50, the dryer filter 42, the subcooler 43, and the first throttle valve EXV1, and then flows through the second heat exchanger 32. After heat exchange in the second heat exchanger 32, the refrigerant flows through the second reversing valve RV2. Since the coil of the second reversing valve RV2 is not energized, the fourth port E and the third port S of the second reversing valve RV2 are connected. Therefore, the refrigerant finally flows back to the suction port 12 of the compressor 10 through the fourth port E and the third port S of the second reversing valve RV2.

[0040] Additionally, in cooling mode, the second solenoid valve SV2 on the first branch of the receiver 50 and the third solenoid valve SV3 on the second branch can be opened or closed as needed. The fourth solenoid valve SV4 on the third and fourth branches of the receiver 50 is closed.

[0041] Figure 2 This illustration shows a schematic diagram of a heat pump unit 1 operating in heating mode according to an embodiment of this application. Figure 2With reference to Table 1, when the heat pump unit 1 of the embodiment of the present application is running in the heating mode, the coils of the first reversing valve RV1 and the second reversing valve RV2 are energized; the second throttling valve EXV2 is a heating throttling valve, the second throttling valve EXV2 is open, and the first throttling valve EXV1 and the third throttling valve EXV3 are both closed; and the first solenoid valve SV1 is closed. In the heating mode, the flow direction of the refrigerant is as follows: the refrigerant flows from the discharge port 11 of the compressor 10, the oil separator 20, the first reversing valve RV1, the first interface D and the fourth interface E of the first reversing valve RV1 are connected due to the energization of the coil of the first reversing valve RV1, the refrigerant flows through the third heat exchanger 33, the sixth check valve CV6, the shared main fluid line 41 passing through the accumulator 50, the drying filter 42, the subcooler 43, and the second throttling valve EXV2, the refrigerant flows through the first heat exchanger 31, the refrigerant exchanges heat in the first heat exchanger 31, and then flows through the second reversing valve RV2, the second interface C and the third interface S of the second reversing valve RV2 are connected due to the energization of the coil of the second reversing valve RV2, and thus the refrigerant finally flows back to the suction port 12 of the compressor 10 through the second interface C and the third interface S of the second reversing valve RV2.

[0042] In addition, in the heating mode, the second solenoid valve SV2 on the first branch of the accumulator 50 and the fourth solenoid valve SV4 on the third branch can be opened or closed as needed. The third solenoid valve SV3 on the second branch of the accumulator 50 is closed.

[0043] Figure 3 A schematic diagram of the heat pump unit 1 of the embodiment of the present application running in the heat recovery mode is disclosed. As shown in FIG. 3, when the heat pump unit 1 of the embodiment of the present application is running in the heat recovery mode, the coils of the first reversing valve RV1 and the second reversing valve RV2 are energized; the second throttling valve EXV2 is a heating throttling valve, the second throttling valve EXV2 is open, and the first throttling valve EXV1 and the third throttling valve EXV3 are both closed; and the first solenoid valve SV1 is closed. Figure 3With reference to Table 1, when the heat pump unit 1 of the embodiment of the present application is running in the heat recovery mode, the coil of the first reversing valve RV1 is energized, while the coil of the second reversing valve RV2 is not energized; the first expansion valve EXV1 is open, while the second expansion valve EXV2 and the third expansion valve EXV3 are both closed; and the first solenoid valve SV1 is closed. In the heat recovery mode, the flow direction of the refrigerant is as follows: the refrigerant flows from the discharge port 11 of the compressor 10, the oil separator 20, through the first reversing valve RV1, at this time, the coil of the first reversing valve RV1 is energized, the first interface D and the fourth interface E of the first reversing valve RV1 are in communication, the refrigerant flows through the third heat exchanger 33, the sixth check valve CV6, the shared main fluid line 41 passing through the accumulator 50, the dry filter 42, the subcooler 43, and the first expansion valve EXV1, and then flows through the second heat exchanger 32, after heat exchange in the second heat exchanger 32, the refrigerant flows through the second reversing valve RV2, since the coil of the second reversing valve RV2 is not energized, the fourth interface E and the third interface S of the second reversing valve RV2 are in communication, thus, the refrigerant finally flows back to the suction port 12 of the compressor 10 through the fourth interface E and the third interface S of the second reversing valve RV2.

[0044] In addition, in the heat recovery mode, the second solenoid valve SV2 on the first branch and the third solenoid valve SV3 on the second branch of the accumulator 50 can be opened or closed as needed. The fourth solenoid valve SV4 on the third branch and the fourth branch of the accumulator 50 is closed.

[0045] Figure 4 A schematic diagram of the heat pump unit 1 of the embodiment of the present application running in the defrosting mode is disclosed. As shown in FIG. 4, when the heat pump unit 1 is running in the defrosting mode, the coil of the first reversing valve RV1 is not energized, while the coil of the second reversing valve RV2 is energized; the first expansion valve EXV1 is closed, while the second expansion valve EXV2 and the third expansion valve EXV3 are both open; and the first solenoid valve SV1 is open. Figure 4With reference to Table 1, when the heat pump unit 1 of the present application operates in the defrosting mode, the coils of the first reversing valve RV1 and the second reversing valve RV2 are not energized; the third throttling valve EXV3 is a defrosting throttling valve, the third throttling valve EXV3 is opened, and the first throttling valve EXV1 and the second throttling valve EXV2 are both closed; the first solenoid valve SV1 is opened. In the defrosting mode, the flow direction of the refrigerant is as follows: the refrigerant flows from the discharge port 11 of the compressor 10, the oil separator 20, through the first reversing valve RV1, at this time, the coil of the first reversing valve RV1 is not energized, the first interface D and the second interface C of the first reversing valve RV1 are communicated, the refrigerant flows through the first interface D and the second interface C of the first reversing valve RV1, through the second reversing valve RV2, at this time, the coil of the second reversing valve RV2 is not energized, the first interface D and the second interface C of the second reversing valve RV2 are communicated, the refrigerant flows through the first interface D and the second interface C of the second reversing valve RV2, through the first heat exchanger 31, the fifth check valve CV5, the shared main fluid pipeline 41 passing through the accumulator 50, the drying filter 42, the subcooler 43 and the third throttling valve EXV3, through the third heat exchanger 33, after heat exchange in the third heat exchanger 33, the refrigerant flows through the first reversing valve RV1, since the coil of the first reversing valve RV1 is not energized, the fourth interface E and the third interface S of the first reversing valve RV1 are communicated, therefore, the refrigerant finally flows through the fourth interface E and the third interface S of the second reversing valve RV2, through the first solenoid valve SV1, back to the suction port 12 of the compressor 10.

[0046] In addition, in the defrosting mode, the second solenoid valve SV2 on the first branch and the fourth solenoid valve SV4 on the fourth branch of the accumulator 50 can be opened or closed as needed. The third solenoid valve SV3 on the second branch of the accumulator 50 is closed.

[0047] The heat pump unit 1 of the present application adds the first branch, the second branch, the third branch and the fourth branch to the accumulator 50 as the balance pressure pipeline, so that, regardless of the mode (cooling, heating, heat recovery or defrosting) in which the heat pump unit 1 operates, during the operation of the heat pump unit 1, the additional amount of refrigerant in the system, except for the amount required for circulation, can be safely charged into the accumulator 50 of the bypass main circuit, the pressure in the system can be effectively controlled within a safe range due to the balance pressure pipeline provided on the accumulator 50, regardless of how much the external temperature rises.

[0048] In addition, during the operation of the heat pump unit 1, the liquid refrigerant entering the internal reservoir 50 has a high temperature, which is conducive to continuously heating the refrigerant in the internal reservoir 50, and ensures that the viscosity of the oil does not gradually increase due to too much temperature reduction. Thus, when the liquid needs to be discharged, the refrigerant is easy to carry the refrigerant oil back to the suction port 12 of the compressor 10, and the moving parts of the compressor 10, such as the rotor and the bearing, are fully lubricated by the oil, and the operation reliability of the heat pump unit 1 is ensured. Therefore, the heat pump unit 1 of the embodiment of the present application can effectively improve or even basically eliminate the oil return problem in low-temperature refrigeration or heat pump applications.

[0049] The heat pump unit 1 of the embodiment of the present application can optimize the system resistance loss when working in different modes (refrigeration, heating, heat recovery or defrosting), thereby improving the performance of the heat pump unit 1; at the same time, the internal reservoir 50 is used to effectively manage the refrigerant circulation amount in the system during different mode operation, thereby greatly improving the reliability of the heat pump unit 1.

[0050] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A heat pump unit, characterized in that: The heat pump unit includes a compressor, a first reversing valve, a second reversing valve, a first heat exchanger, a second heat exchanger, and a third heat exchanger. The first and second reversing valves connect any two of the heat exchangers to the compressor, allowing the heat pump unit to operate in different modes. The heat pump unit also includes a shared unit for different operating modes. The first and second reversing valves have a first port, a second port, a third port, and a fourth port. The first port of the first reversing valve is connected to the compressor's exhaust port. The second port of the first reversing valve is connected to the first port of the second reversing valve. The third ports of the first and second reversing valves are connected to the compressor's intake port. The fourth port of the first reversing valve is connected to the first port of the third heat exchanger. The second reversing valve... The second interface is connected to the first port of the first heat exchanger, and the fourth interface of the second reversing valve is connected to the second port of the second heat exchanger. The shared unit portion has a first end and a second end. The first end of the shared unit portion is connected between the second port of the first heat exchanger and the second port of the third heat exchanger, and the second end of the shared unit portion is connected between the second port of the first heat exchanger and the first port of the second heat exchanger. The heat pump unit also includes a liquid receiver. The shared unit portion includes a shared main fluid pipeline that runs through the liquid receiver. The shared unit portion also includes a dryer filter and a subcooler. One end of the shared main fluid pipeline is connected to the first end, and the other end of the shared main fluid pipeline is connected to the inlet of the dryer filter. The outlet of the dryer filter is connected to the inlet of the main line of the subcooler, and the outlet of the main line of the subcooler is connected to the second end.

2. The heat pump unit as described in claim 1, characterized in that: A first solenoid valve is connected between the third port of the first reversing valve and the third port of the second reversing valve.

3. The heat pump unit as described in claim 1, characterized in that: Also includes: The first branch is connected between the outlet of the dryer filter and the first interface of the reservoir. The first branch includes a second solenoid valve and a first check valve connected in series.

4. The heat pump unit as described in claim 1 or 3, characterized in that: Also includes: The second branch is connected between the second port of the liquid reservoir and the third port of the second heat exchanger. The second branch includes a third solenoid valve and a second check valve connected in series. A third branch is connected between the second port of the liquid reservoir and the second port of the first heat exchanger, and the third branch includes a fourth solenoid valve and a third check valve connected in series; and The fourth branch is connected between the second port of the liquid reservoir and the second port of the third heat exchanger. The fourth branch includes the fourth solenoid valve and the fourth check valve connected in series.

5. The heat pump unit as described in claim 1, characterized in that: The second end of the shared unit portion is connected to the first port of the second heat exchanger via a first throttle valve, the second end of the shared unit portion is connected to the second port of the first heat exchanger via a second throttle valve, and the second end of the shared unit portion is connected to the second port of the third heat exchanger via a third throttle valve.

6. The heat pump unit as described in claim 1, characterized in that: The second port of the first heat exchanger is connected to the first end of the shared unit section via a fifth check valve, and the second port of the third heat exchanger is connected to the first end of the shared unit section via a sixth check valve.

7. The heat pump unit as described in claim 1, characterized in that: A seventh check valve is connected between the first port of the reservoir and the inlet of the dryer filter.

8. The heat pump unit as described in claim 1, characterized in that: The inlet of the auxiliary circuit of the subcooler is connected to the inlet of the main circuit through a fourth throttle valve, and the outlet of the auxiliary circuit of the subcooler is connected to the suction port of the compressor.

9. The heat pump unit as described in claim 1, characterized in that: It also includes an oil separator, the inlet of which is connected to the exhaust port of the compressor, the outlet of which is connected to the first interface of the first reversing valve, and the oil outlet of which is connected to the oil outlet of the compressor.

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