CN221684830U - Heat pump unit - Google Patents

Abstract

The application relates to a heat pump unit, which comprises: the device comprises a first throttling piece, a one-way valve group, a first heat exchanger, a liquid storage tank and a second heat exchanger. The one-way valve group comprises a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve, one port of the first heat exchanger is communicated with the output end of the first one-way valve and the input end of the second one-way valve, and the liquid storage tank is provided with a first port and a second port. The first port is communicated with the input end of the fourth one-way valve, and one port of the second heat exchanger is communicated with the output end of the third one-way valve and the second port. During refrigeration, the refrigerant medium can flow to the second heat exchanger directly after flowing out of the output end of the third one-way valve, and the refrigerant medium does not need to pass through the liquid storage tank, so that the condition that part of the refrigerant medium is evaporated due to the fact that the refrigerant medium flows through the liquid storage tank is avoided, and the operation efficiency of the heat pump unit is improved.

Description

Heat pump unit

Technical Field

The present application relates to the technical field of heat pumps, and in particular to a heat pump unit.

Background Art

During the operation of the heat pump unit, the internal refrigerant will circulate between different heat exchange components. When the refrigerant flows in a predetermined direction, it passes through the water-side heat exchange component at low pressure and low temperature, so that the water-side heat exchange component can produce a cooling effect. When the refrigerant flows in another direction, it passes through the water-side heat exchange component at high pressure and high temperature, so that the water-side heat exchange component can produce a heating effect.

In traditional technology, when the heat pump unit is running in cooling mode, the refrigerant passes through the throttling device, the liquid storage tank and the water-side heat exchange device in sequence. After passing through the throttling device, the refrigerant is in a low-temperature and low-pressure state. Since part of the refrigerant evaporates after entering the liquid storage tank, the refrigerant that can evaporate and absorb heat in the water-side heat exchange device is reduced, resulting in a decrease in the operating efficiency of the heat pump unit.

Summary of the invention

The technical problem solved by the present invention is to provide a heat pump unit, which can effectively prevent a part of the refrigerant from evaporating after entering the liquid storage tank in the refrigeration mode, avoid the reduction of the refrigerant that can evaporate and absorb heat in the water side heat exchange device, and ensure that the heat pump unit has a higher operating efficiency.

The above technical problems are solved by the following technical solutions:

A heat pump unit, comprising:

A first throttling member having an input end and an output end;

A one-way valve group is provided with an input node and an output node; the input node is connected to the output end of the first throttle member; the output node is connected to the input end of the first throttle member; the one-way valve group includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve; the input end of the first one-way valve and the input end of the third one-way valve are connected to form the input node; the output end of the second one-way valve and the output end of the fourth one-way valve are connected to form the output node;

A first heat exchanger, wherein a port of the first heat exchanger is connected to the output end of the first one-way valve and to the input end of the second one-way valve;

A liquid storage tank, provided with a first port and a second port; the first port is connected to the input end of the fourth one-way valve;

a second heat exchanger, wherein a port of the second heat exchanger is connected to the output end of the third one-way valve and to the second port;

A compressor having a suction inlet and a discharge outlet; and

The reversing valve is provided with an air inlet end, an air return end, a first changing end and a second changing end; the air inlet end is connected to the exhaust port; the air return end is connected to the suction port; the first changing end is connected to another port of the first heat exchanger; and the second changing end is connected to another port of the second heat exchanger.

The heat pump unit described in the present invention has the following beneficial effects compared with the background technology: during cooling, since the pressure of the refrigerant when flowing out from the output end of the third one-way valve is lower than the pressure of the output node, and since the liquid storage tank is connected between the output end of the third one-way valve and the input end of the fourth one-way valve, the pressure on the liquid storage tank side is relatively large, so that the refrigerant flows out from the output end of the third one-way valve directly to the second heat exchanger without passing through the liquid storage tank, thereby avoiding the situation where the refrigerant flows through the liquid storage tank and causes part of the refrigerant to evaporate, which helps to ensure the refrigeration effect around the second heat exchange device and improve the operating efficiency of the heat pump unit.

In one embodiment, the first heat exchanger is an air-side heat exchanger.

In one embodiment, the second heat exchanger is a water-side heat exchanger.

In one embodiment, it also includes an enthalpy-increasing heat exchanger and a second throttling device; the enthalpy-increasing heat exchanger has a first heat exchange channel and a second heat exchange channel; the compressor is also provided with an air supply port; the first heat exchange channel is connected between the output node and the input end of the first throttling device; the input end of the second throttling device is connected to the input end of the first throttling device; the second heat exchange channel is connected between the output end of the second throttling device and the air supply port.

In one embodiment, a filter is further included; the filter is connected between the output node and the first heat exchange channel. When the refrigerant flows through the filter, the filter can filter out impurities flowing with the refrigerant, thereby effectively avoiding blockage at other locations of the heat pump unit, which helps to keep the heat pump unit running stably.

In one embodiment, at least one of the first throttling element and the second throttling element is an electronic expansion valve.

In one embodiment, the enthalpy-increasing heat exchanger is a plate heat exchanger.

In one embodiment, the heat pump unit further includes a first temperature detection member, which is disposed between the second heat exchange channel and the air supply port, and the first temperature detection member can detect the temperature of the cold medium when it enters the air supply port, thereby facilitating the improvement of the accuracy of the operation of the heat pump unit. The heat pump unit further includes a second temperature detection member, which is disposed between the output end of the second throttling member and the second heat exchange channel, so that the second temperature detection member can detect the temperature of the cold medium before it enters the second heat exchange channel, thereby facilitating the identification of the overall operation status of the heat pump unit.

In one of the embodiments, it further includes a gas-liquid separator; the input end of the gas-liquid separator is connected to the gas return end; and the output end of the gas-liquid separator is connected to the suction port.

In one embodiment, the heat pump unit further includes a third temperature detection component, which is disposed between the output end of the gas-liquid separator and the suction port, and the third temperature detection component can detect the temperature of the refrigerant when entering the suction port of the compressor, thereby facilitating the improvement of the accuracy of the operation of the heat pump unit. The heat pump unit further includes a fourth temperature detection component, which is disposed between the return air end and the input end of the gas-liquid separator, so that the fourth temperature detection component can detect the temperature of the refrigerant before entering the input end of the gas-liquid separator, thereby facilitating the identification of the overall operation status of the heat pump unit.

In one embodiment, the liquid storage tank is a bidirectional liquid storage tank.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a heat pump unit according to an embodiment of the present application.

FIG. 2 is a schematic diagram of the refrigerant flow direction of the heat pump unit shown in FIG. 1 in the cooling mode.

FIG. 3 is a schematic diagram of the refrigerant flow direction of the heat pump unit shown in FIG. 1 in the heating mode.

: 100, heat pump unit; 20, first throttling device; 30, one-way valve group; 301, output node; 302, input node; 31, first one-way valve; 32, second one-way valve; 33, third one-way valve; 34, fourth one-way valve; 40, first heat exchanger; 50, liquid storage tank; 501, first port; 502, second port; 60, second heat exchanger; 70, compressor; 701, suction port; 702, discharge port; 703, air supply port; 71, gas-liquid separator; T3, third temperature detection device; T4, fourth temperature detection device; 80, reversing valve; D, air inlet end; S, air return end; E, first changing end; C, second changing end; 90, enthalpy increase heat exchanger; 91, second throttling device; 92, filter; T1, first temperature detection device; T2, second temperature detection device.

DETAILED DESCRIPTION

In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or the like, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

The technical solution provided by the embodiments of the present application is described below in conjunction with the accompanying drawings.

The present application provides a heat pump unit 100 .

In some embodiments, the heat pump unit 100 is used to adjust and control the temperature condition of a specified environment. Specifically, the heat pump unit 100 can operate in a cooling mode or a heating mode. In the cooling mode, the heat pump unit 100 absorbs heat from the specified environment, thereby generating a cooling effect. In the heating mode, the heat pump unit 100 releases heat to the specified environment, thereby generating a heating effect.

In some embodiments, as shown in FIG. 1 , the heat pump unit 100 includes: a first throttle 20, a one-way valve group 30, a first heat exchanger 40, a liquid storage tank 50, and a second heat exchanger 60. The first throttle 20 is provided with an input end and an output end. The one-way valve group 30 is provided with an input node 302 and an output node 301. The input node 302 is connected to the output end of the first throttle 20. The output node 301 is connected to the input end of the first throttle 20. The one-way valve group 30 includes a first one-way valve 31, a second one-way valve 32, a third one-way valve 33, and a fourth one-way valve 34. The input end of the first one-way valve 31 and the input end of the third one-way valve 33 are combined to form an input node 302, and the output end of the second one-way valve 32 and the output end of the fourth one-way valve 34 are combined to form an output node 301. One port of the first heat exchanger 40 is connected to the output end of the first one-way valve 31 and to the input end of the second one-way valve 32. The liquid storage tank 50 is provided with a first port 501 and a second port 502. The first port 501 is connected to the input end of the fourth check valve 34. One port of the second heat exchanger 60 is connected to the output end of the third check valve 33 and to the second port 502.

The heat pump unit 100 further includes a compressor 70 and a reversing valve 80. The compressor 70 is provided with an inlet 701 and an outlet 702. The reversing valve 80 is provided with an air inlet end D, an air return end S, a first reversing end E and a second reversing end C. The inlet 701 is connected to the air return end S. The outlet 702 is connected to the air inlet end D. The first reversing end E is connected to another port of the first heat exchanger 40. The second reversing end C is connected to another port of the second heat exchanger 60. Specifically, the compressor 70 can output a pressurized refrigerant.

Specifically, as shown in FIG2 , when the heat pump unit 100 operates in the cooling mode, the refrigerant sequentially passes through the first heat exchanger 40, the second one-way valve 32, the first throttle 20, the third one-way valve 33 and the second heat exchanger 60. Specifically, the suction port 701 of the compressor 70 sucks in the low-temperature and low-pressure gaseous refrigerant, and then discharges the high-temperature and high-pressure gaseous refrigerant from the discharge port 702, and the high-temperature and high-pressure gaseous refrigerant flows to the first heat exchanger 40 through the reversing valve 80, and the high-temperature and high-pressure gaseous refrigerant condenses into medium-temperature and high-pressure liquid refrigerant inside the first heat exchanger 40, for example, during the condensation process, the refrigerant transfers heat to the air. The medium-temperature and high-pressure liquid refrigerant coming out of the first heat exchanger 40 flows to the first throttling member 20 through the second one-way valve 32, and the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after passing through the first throttling member 20; the low-temperature and low-pressure liquid refrigerant flows to the second heat exchanger 60 through the third one-way valve 33, and the low-temperature and low-pressure liquid refrigerant evaporates inside the second heat exchanger 60 and becomes a low-temperature and low-pressure gaseous refrigerant, and the low-temperature and low-pressure gaseous refrigerant re-enters the compressor 70, and the cycle continues.

It can be understood that since the pressure of the refrigerant when flowing out from the output end of the third one-way valve 33 is lower than the pressure of the output node 301, and since the liquid storage tank 50 is connected between the output end of the third one-way valve 33 and the input end of the fourth one-way valve 34, the pressure on the side of the liquid storage tank 50 is relatively large, so that the refrigerant flows out from the output end of the third one-way valve 33 and flows directly to the second heat exchanger 60 without passing through the liquid storage tank 50, thereby avoiding the situation where the refrigerant flows through the liquid storage tank 50 and causes part of the refrigerant to evaporate, which helps to ensure the refrigeration effect around the second heat exchanger 60 and improve the operating efficiency of the heat pump unit 100.

Specifically, as shown in FIG3 , when the heat pump unit 100 operates in the heating mode, the refrigerant passes through the second heat exchanger 60, the liquid storage tank 50, the fourth one-way valve 34, the first throttle 20, the first one-way valve 31 and the first heat exchanger 40 in sequence. Specifically, the suction port 701 of the compressor 70 sucks in the low-temperature and low-pressure gaseous refrigerant, and then discharges the high-temperature and high-pressure gaseous refrigerant from the discharge port 702, and the high-temperature and high-pressure gaseous refrigerant flows to the second heat exchanger 60 through the reversing valve 80, and the high-temperature and high-pressure gaseous refrigerant is condensed into a medium-temperature and high-pressure liquid refrigerant inside the second heat exchanger 60. For example, during the condensation process, the refrigerant transfers heat to water. The medium-temperature and high-pressure liquid refrigerant coming out of the second heat exchanger 60 flows to the first throttling member 20 through the liquid storage tank 50 and the fourth one-way valve 34. The medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after passing through the first throttling member 20; the low-temperature and low-pressure liquid refrigerant flows to the first heat exchanger 40 through the first one-way valve 31. The low-temperature and low-pressure liquid refrigerant evaporates inside the first heat exchanger 40 and becomes a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant re-enters the compressor 70, and the cycle continues.

In some embodiments, the first heat exchanger 40 is an air-side heat exchanger, and the refrigerant medium exchanges heat with other gaseous media in the first heat exchanger 40 .

In some embodiments, the second heat exchanger 60 is a water-side heat exchanger, and the refrigerant medium exchanges heat with other liquid media in the second heat exchanger 60 .

In some embodiments, the liquid storage tank 50 is a bidirectional liquid storage tank 50, so that the liquid storage tank 50 can adapt to different connection structures.

In some embodiments, in combination with FIG. 2 and FIG. 3, the heat pump unit 100 further includes an enthalpy-increasing heat exchanger 90 and a second throttling member 91. The enthalpy-increasing heat exchanger 90 has a first heat exchange channel and a second heat exchange channel. The compressor 70 is also provided with an air supply port 703. The first heat exchange channel is connected between the output node 301 and the input end of the first throttling member 20. The input end of the second throttling member 91 is connected to the input end of the first throttling member 20. The second heat exchange channel is connected between the output end of the second throttling member 91 and the air supply port 703.

Specifically, after leaving the first heat exchange channel, a portion of the refrigerant enters and passes through the second throttling device 91 and the second heat exchange channel in sequence, wherein the medium-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after passing through the second throttling device 91, and the low-temperature and low-pressure liquid refrigerant evaporates in the second heat exchange channel and becomes a low-temperature and low-pressure gaseous refrigerant, and then is input into the air supply port 703 of the compressor 70.

In some embodiments, the enthalpy-increasing heat exchanger 90 is a plate-type heat exchanger, which helps to ensure high heat exchange efficiency of the enthalpy-increasing heat exchanger 90 and helps to ensure the compactness of the structure of the enthalpy-increasing heat exchanger 90 .

In some embodiments, at least one of the first throttle element 20 and the second throttle element 91 is an electronic expansion valve.

In some embodiments, as shown in FIG. 1 , the heat pump unit 100 further includes a filter 92. The filter 92 is connected between the output node 301 and the first heat exchange channel. Specifically, by providing the filter 92, after the refrigerant leaves the output node 301 of the one-way valve group 30, it first passes through the filter 92 and then flows to the first heat exchange channel. When the refrigerant flows through the filter 92, the filter 92 can filter out impurities flowing with the refrigerant, thereby preventing other positions of the heat pump unit 100 from being blocked, which helps to keep the heat pump unit 100 running stably.

In some embodiments, as shown in FIG. 1 , the heat pump unit 100 further includes a first temperature detection component T1, which is disposed between the second heat exchange channel and the air supply port 703. Specifically, the sensing end of the first temperature detection component T1 is disposed in the passage between the second heat exchange channel and the air supply port 703, and the first temperature detection component T1 can detect the temperature of the refrigerant when entering the air supply port 703, thereby facilitating the improvement of the accuracy of the operation of the heat pump unit 100. In one embodiment, the temperature of the refrigerant when entering the air supply port 703 is controlled within a temperature difference range of ±3°C, so that the heat pump unit 100 can have a higher operating efficiency. The first temperature detection component T1 detects the temperature of the refrigerant when entering the air supply port 703 and feeds back to the control device.

In some embodiments, as shown in FIG1 , the heat pump unit 100 further includes a second temperature detection component T2, which is disposed between the output end of the second throttling component 91 and the second heat exchange channel. Specifically, the sensing end of the second temperature detection component T2 is disposed between the output end of the second throttling component 91 and the second heat exchange channel, so that the second temperature detection component T2 can detect the temperature of the refrigerant before it is input into the second heat exchange channel, which is helpful for identifying the overall operating status of the heat pump unit 100.

In some embodiments, as shown in FIG1 , the heat pump unit 100 further includes a gas-liquid separator 71. The input end of the gas-liquid separator 71 is connected to the return air end S, and the output end of the gas-liquid separator 71 is connected to the suction port 701. Specifically, the gas-liquid separator 71 can limit the liquid refrigerant from flowing into the suction port 701 of the compressor 70, thereby improving the operating efficiency and service life of the compressor 70.

In some embodiments, as shown in FIG. 1 , the heat pump unit 100 further includes a third temperature detection member T3, which is disposed between the output end of the gas-liquid separator 71 and the suction port 701. Specifically, the sensing end of the third temperature detection member T3 is disposed between the output end of the gas-liquid separator 71 and the suction port 701, and the third temperature detection member T3 can detect the temperature of the refrigerant when it enters the suction port 701 of the compressor 70, thereby facilitating the improvement of the accuracy of the operation of the heat pump unit 100. In one embodiment, the return air superheat of the heat pump unit 100 needs to be ensured to be greater than zero, that is, the temperature of the refrigerant when it enters the suction port 701 of the compressor 70 is not less than the evaporation temperature.

In some embodiments, as shown in FIG1 , the heat pump unit 100 further includes a fourth temperature detection component T4, which is disposed between the return air end S and the input end of the gas-liquid separator 71. Specifically, the sensing end of the fourth temperature detection component T4 is disposed between the return air end S and the input end of the gas-liquid separator 71, so that the fourth temperature detection component T4 can detect the temperature of the refrigerant before being input into the input end of the gas-liquid separator 71, which is helpful for identifying the overall operating status of the heat pump unit 100.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims (10)

1. A heat pump assembly, comprising:

a first throttling element (20) provided with an input end and an output end;

A check valve group (30) provided with an input node (302) and an output node (301); the input node (302) is in communication with an output of the first throttling element (20); the output node (301) is communicated with the input end of the first throttling element (20); the one-way valve group (30) comprises a first one-way valve (31), a second one-way valve (32), a third one-way valve (33) and a fourth one-way valve (34); the input end of the first one-way valve (31) and the input end of the third one-way valve (33) are connected to form the input node (302); the output end of the second one-way valve (32) and the output end of the fourth one-way valve (34) are connected to form the output node (301);

A first heat exchanger (40), wherein one port of the first heat exchanger (40) is communicated with the output end of the first one-way valve (31) and is communicated with the input end of the second one-way valve (32);

A liquid storage tank (50) provided with a first port (501) and a second port (502); the first port (501) is communicated with the input end of the fourth one-way valve (34);

A second heat exchanger (60), wherein one port of the second heat exchanger (60) is communicated with the output end of the third one-way valve (33) and is communicated with the second port (502);

a compressor (70) provided with a suction port (701) and a discharge port (702); and

The reversing valve (80) is provided with an air inlet end (D), an air return end (S), a first turning end (E) and a second turning end (C); the air inlet end (D) is communicated with the exhaust outlet (702); the air return end (S) is communicated with the suction inlet (701); the first turning end (E) is communicated with the other port of the first heat exchanger (40); the second turning end (C) is communicated with the other port of the second heat exchanger (60).

2. Heat pump unit according to claim 1, wherein the first heat exchanger (40) is an air side heat exchanger and/or the second heat exchanger (60) is a water side heat exchanger.

3. The heat pump assembly according to claim 2, further comprising an enthalpy-increasing heat exchanger (90) and a second throttle (91); the enthalpy-increasing heat exchanger (90) is provided with a first heat exchange channel and a second heat exchange channel; the compressor (70) is also provided with a gas supplementing port (703); the first heat exchange channel is communicated between the output node (301) and the input end of the first throttling element (20); the input end of the second throttling element (91) is communicated with the input end of the first throttling element (20); the second heat exchange channel is communicated between the output end of the second throttling element (91) and the air supplementing port (703).

4. A heat pump assembly according to claim 3, further comprising a filter (92); the filter (92) is in communication between the output node (301) and the first heat exchange channel.

5. A heat pump unit according to claim 3, wherein at least one of the first throttling element (20) and the second throttling element (91) is an electronic expansion valve.

6. A heat pump unit according to claim 3, wherein the enthalpy increasing heat exchanger (90) is a plate heat exchanger.

7. A heat pump unit according to claim 3, wherein the heat pump unit (100) further comprises a first temperature detecting member (T1), the first temperature detecting member (T1) being arranged between the second heat exchanging channel and the air compensating opening (703); and/or, the heat pump unit (100) further comprises a second temperature detection piece (T2), and the second temperature detection piece (T2) is arranged between the output end of the second throttling piece (91) and the second heat exchange channel.

8. The heat pump assembly according to claim 2, further comprising a gas-liquid separator (71); the input end of the gas-liquid separator (71) is communicated with the return air end (S); an output end of the gas-liquid separator (71) is communicated with the suction inlet (701).

9. The heat pump unit according to claim 8, wherein the heat pump unit (100) further comprises a third temperature detecting member (T3), the third temperature detecting member (T3) being disposed between an output end of the gas-liquid separator (71) and the suction port (701); and/or, the heat pump unit (100) further comprises a fourth temperature detection piece (T4), and the fourth temperature detection piece (T4) is arranged between the air return end (S) and the input end of the gas-liquid separator (71).

10. The heat pump assembly according to claim 1, wherein the reservoir (50) is a bi-directional reservoir (50).