Heat pump device

Abstract

The utility model provides a heat pump device which comprises a circulation loop, a plurality of compressors, a first heat exchanger, a plurality of economizers and a second heat exchanger, wherein the compressors and the first heat exchanger are arranged on the circulation loop in parallel, and the economizers and the second heat exchanger are arranged on the circulation loop in parallel. The economizers are in one-to-one correspondence with the compressors; fluid in a main loop and fluid in an auxiliary loop of the economizer can exchange heat, an inlet of the main loop is communicated with one of a first heat exchanger and a second heat exchanger, and an outlet of the main loop is communicated with the other one of the first heat exchanger and the second heat exchanger through a first connecting pipe. An inlet of the auxiliary loop is communicated with the corresponding first connecting pipe through a second connecting pipe, and an outlet of the auxiliary loop is communicated with an air supply port of the corresponding compressor; a first throttling element is arranged on the first connecting pipe, a second throttling element is arranged on the second connecting pipe, and the second throttling element is located on the downstream of the connecting position of the second connecting pipe and the first connecting pipe. According to the scheme, the energy consumption of the compressor can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of heat pump devices, and more specifically, to a heat pump device. Background Technology

[0002] A heat pump unit typically includes a circulation pipeline and components such as a compressor, a first heat exchanger, an expansion valve, and a second heat exchanger installed on the circulation pipeline. During the operation of the heat pump unit, the refrigerant is compressed to a high-temperature, high-pressure gaseous state in the compressor, and then releases heat and condenses into a liquid state when passing through the first heat exchanger. The liquid refrigerant is throttled and depressurized through the expansion valve, and then absorbs heat and evaporates into a gaseous state when passing through the second heat exchanger before returning to the compressor.

[0003] During the operation of a heat pump unit, the refrigerant may not be completely liquefied after passing through the first heat exchanger. If this incomplete liquefaction occurs, the unliquefied refrigerant may become overcooled after passing through the expansion valve. This overcooled refrigerant may then undergo incomplete evaporation after passing through the second heat exchanger, resulting in the compressor receiving refrigerant containing liquid components. In other words, the gaseous component in the refrigerant received by the compressor decreases. Consequently, the compressor needs to perform more work to bring the refrigerant pressure up to the inlet pressure of the first heat exchanger, leading to higher compressor energy consumption. Utility Model Content

[0004] This invention provides a heat pump device to solve the problem in the prior art where, during the operation of a heat pump device, the refrigerant cannot be completely liquefied after passing through the first heat exchanger, and the evaporation of the refrigerant after passing through the second heat exchanger may be incomplete, resulting in a low gaseous content of the refrigerant drawn into the compressor in each cycle and an increase in compressor energy consumption.

[0005] This utility model provides a heat pump device, comprising: a circulation loop and a compressor assembly, a first heat exchanger, an economizer assembly, and a second heat exchanger disposed on the circulation loop; the compressor assembly includes multiple compressors arranged in parallel, each compressor having a gas inlet; the economizer assembly includes multiple economizers arranged in parallel, each economizer corresponding to a compressor; each economizer has an independent main loop and an auxiliary loop, the fluid in the main loop and the fluid in the auxiliary loop can exchange heat, the inlet of the main loop is connected to one of the first and second heat exchangers, the outlet of the main loop is connected to the other of the first and second heat exchangers through a first connecting pipe, the inlet of the auxiliary loop is connected to the corresponding first connecting pipe through a second connecting pipe, and the outlet of the auxiliary loop is connected to the gas inlet of the corresponding compressor; a first throttling element is disposed on the first connecting pipe corresponding to each economizer, the first throttling element being located downstream of the connection position between the second connecting pipe and the first connecting pipe; a second throttling element is disposed on the second connecting pipe corresponding to each economizer.

[0006] Furthermore, the inlet of the main circuit can be selectively connected to one of the first openings of the first heat exchanger and the first opening of the second heat exchanger.

[0007] Furthermore, the heat pump device also includes: a reversing valve disposed on the circulation loop, the reversing valve having a first connected state and a second connected state, when the reversing valve is in the first connected state, the refrigerant in the circulation loop passes sequentially through the compressor assembly, the first heat exchanger, the economizer assembly, and the second heat exchanger; when the reversing valve is in the second connected state, the refrigerant in the circulation loop passes sequentially through the compressor assembly, the second heat exchanger, the economizer assembly, and the first heat exchanger.

[0008] Furthermore, the heat pump device also includes: a first liquid inlet branch, one end of which is connected to the first heat exchanger, and the other end of which is connected to the inlet of the main circuit of multiple economizers; a first check valve, disposed on the first liquid inlet branch, to allow refrigerant to flow unidirectionally from the first heat exchanger to the economizer assembly; a first liquid outlet branch, one end of which is connected to multiple first connecting pipes, and the other end of which is connected to the second heat exchanger; and a second check valve, disposed on the first liquid outlet branch, to allow refrigerant to flow unidirectionally from the economizer assembly to the second heat exchanger; wherein, when the reversing valve is in the first connected state, both the first check valve and the second check valve are in the open state; and when the reversing valve is in the second connected state, both the first check valve and the second check valve are in the closed state.

[0009] Furthermore, the heat pump device also includes: a second liquid inlet branch, one end of which is connected to the second heat exchanger, and the other end of which is connected to the inlet of the main circuit of multiple economizers; a third check valve, which is provided on the second liquid inlet branch to allow refrigerant to flow unidirectionally from the second heat exchanger to the economizer assembly; a second liquid outlet branch, one end of which is connected to multiple first pipes, and the other end of which is connected to the first heat exchanger; and a fourth check valve, which is provided on the second liquid outlet branch to allow refrigerant to flow unidirectionally from the economizer assembly to the first heat exchanger; wherein, when the reversing valve is in the second connected state, both the third and fourth check valves are in the open state; and when the reversing valve is in the first connected state, both the third and fourth check valves are in the closed state.

[0010] Furthermore, the heat pump device also includes: a gas-liquid separator, which is installed in the circulation loop. When the inlet of the main loop is connected to the first heat exchanger, the inlet of the gas-liquid separator is connected to the second heat exchanger, and the outlet of the gas-liquid separator is connected to the inlet of the compressor; when the inlet of the main loop is connected to the second heat exchanger, the inlet of the gas-liquid separator is connected to the first heat exchanger, and the outlet of the gas-liquid separator is connected to the inlet of the compressor.

[0011] Furthermore, the heat pump device also includes a filter section located upstream of the economizer, which is used to filter the refrigerant in the main circuit flowing to the economizer.

[0012] Furthermore, the economizer assembly also includes: a first manifold, one end of which is connected to one of the first and second heat exchangers, and the other end of which is connected to the inlet of the main circuit of the plurality of economizers; and / or, a second manifold, one end of which is connected to the other of the first and second heat exchangers, and the other end of which is connected to the outlet of the main circuit of the plurality of economizers.

[0013] Furthermore, the compressor assembly also includes an oil balance pipe, which connects at least two adjacent compressors to balance the liquid refrigerant in the two adjacent compressors.

[0014] By applying the technical solution of this utility model, when the refrigerant is not completely liquefied after passing through the first heat exchanger, it passes through an economizer before entering the second heat exchanger. Specifically, the refrigerant in the main circuit after passing through the economizer continues to flow to the second heat exchanger in liquid form; the refrigerant in the auxiliary circuit experiences a rapid pressure drop under the throttling effect of the second throttling element, causing it to evaporate into a gaseous or gas-liquid mixture. The refrigerant in the auxiliary circuit absorbs a large amount of heat during evaporation. During evaporation, heat exchange occurs between the refrigerants in the auxiliary and main circuits. The refrigerant in the auxiliary circuit absorbs heat from the refrigerant in the main circuit, its temperature rises, and it evaporates; while the refrigerant in the main circuit releases heat, its temperature further decreases, reducing the gaseous components in the refrigerant flowing towards the second heat exchanger. This arrangement improves the heat exchange effect of the second heat exchanger, reduces the liquid components in the refrigerant entering the compressor, and lowers the compressor's power consumption. Furthermore, the refrigerant in the auxiliary circuit flows to the corresponding compressor in gaseous form and replenishes the compressor, allowing the compressor to draw in more gaseous refrigerant each time, reducing energy consumption during the compressor compression process and further reducing the compressor's energy consumption.

[0015] Furthermore, each compressor is equipped with an economizer. When some compressors in the parallel system are not working, the first and second throttling elements of the economizer corresponding to those compressors are closed. This prevents refrigerant from bypassing the circuits of the non-working compressors and their corresponding economizers, ensuring that the refrigerant is concentrated in the operating compressors and their corresponding economizers. This further improves the compression efficiency of the compressors in operation, reduces the energy consumption of the compressors in operation, optimizes the management and distribution of refrigerant, and improves the overall system efficiency. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 This diagram shows a structural schematic of a heat pump device according to Embodiment 1 of the present invention;

[0018] Figure 2 This diagram shows a heat pump device according to Embodiment 2 of the present invention in a refrigeration cycle.

[0019] Figure 3 A schematic diagram of the heat pump device provided in Embodiment 2 of this utility model in the heating cycle is shown.

[0020] The above figures include the following reference numerals:

[0021] 01. Loop;

[0022] 10. Compressor; 11. Oil balance pipe;

[0023] 20. First heat exchanger;

[0024] 30. Economizer; 301. Main circuit; 302. Auxiliary circuit;

[0025] 31. First connecting pipe; 311. First throttling component;

[0026] 32. Second connector; 321. Second throttling component;

[0027] 331. First manifold; 332. Second manifold;

[0028] 40. Second heat exchanger;

[0029] 50. Reversing valve;

[0030] 61. First inlet branch; 611. First check valve; 62. First outlet branch; 621. Second check valve;

[0031] 71. Second inlet branch; 711. Third check valve; 72. Second outlet branch; 721. Fourth check valve;

[0032] 80. Gas-liquid separator;

[0033] 90. Filtration section. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] like Figure 1As shown, Embodiment 1 of this utility model provides a heat pump device, which includes a circulation loop 01 and a compressor assembly, a first heat exchanger 20, an economizer assembly, and a second heat exchanger 40 disposed on the circulation loop 01. The compressor assembly includes multiple compressors 10 connected in parallel, each compressor 10 having a gas inlet. The economizer assembly includes multiple economizers 30 connected in parallel, with each economizer 30 corresponding to one of the compressors 10. Each economizer 30 has an independent main loop 301 and an auxiliary loop 302. The fluid in the main loop 301 and the fluid in the auxiliary loop 302 exchange heat. The inlet of the main loop 301 is connected to one of the first heat exchanger 20 and the second heat exchanger 40, and the outlet of the main loop 301 is connected to the first heat exchanger 20 via a first connecting pipe 31. 0 and the other connection of the second heat exchanger 40, the inlet of the auxiliary circuit 302 is connected to the corresponding first pipe 31 through the second pipe 32, and the outlet of the auxiliary circuit 302 is connected to the corresponding air supply port of the compressor 10; the first throttling element 311, each economizer 30 is provided with a first throttling element 311 on the first pipe 31, the first throttling element 311 is located downstream of the connection position between the second pipe 32 and the first pipe 31; the second throttling element 321, each economizer 30 is provided with a second throttling element 321 on the second pipe 32. Figure 1 The arrows in the diagram indicate the direction of refrigerant flow.

[0036] Applying the technical solution of this utility model, when the refrigerant is not completely liquefied after passing through the first heat exchanger 20, the refrigerant will pass through the economizer 30 before entering the second heat exchanger 40. Specifically, the refrigerant in the main circuit 301 after passing through the economizer 30 continues to flow to the second heat exchanger 40 in liquid form; the pressure of the refrigerant in the auxiliary circuit 302 decreases rapidly under the throttling effect of the second throttling element 321, causing the refrigerant in the auxiliary circuit 302 to evaporate and form a gaseous state or a gas-liquid mixture. The refrigerant in the auxiliary circuit 302 needs to absorb a large amount of heat during the evaporation process. During the evaporation process, the refrigerant in the auxiliary circuit 302 and the refrigerant in the main circuit 301 exchange heat. The refrigerant in the auxiliary circuit 302 absorbs the heat of the refrigerant in the main circuit 301, its temperature rises and it evaporates; while the refrigerant in the main circuit 301 releases heat, its temperature further decreases, reducing the gaseous components in the refrigerant flowing towards the second heat exchanger 40. The above configuration improves the heat exchange efficiency of the second heat exchanger 40, reduces the liquid component in the refrigerant entering the compressor 10, and lowers the power consumption of the compressor 10. Furthermore, the refrigerant in the auxiliary circuit 302 flows into the corresponding compressor 10 in gaseous form to replenish the compressor 10, allowing the compressor 10 to draw in more gaseous refrigerant each time, reducing energy consumption during the compression process and further lowering the energy consumption of the compressor 10.

[0037] Furthermore, each compressor 10 is configured with a corresponding economizer 30. When some of the parallel compressors 10 are not operating, the first throttling element 311 and the second throttling element 321 of the economizer 30 corresponding to those compressors 10 are closed. This prevents refrigerant from bypassing the circuits of the non-operating compressors 10 and their corresponding economizers 30. In other words, when a compressor 10 is operating, its corresponding economizer 30 is also operating. This configuration ensures that the refrigerant circulates concentratedly in the operating compressors 10 and their corresponding economizers 30, further improving the compression efficiency of the compressors 10 during operation, reducing the energy consumption of the compressors 10 during operation, optimizing refrigerant management and distribution, and improving the overall system efficiency.

[0038] It is understandable that the first throttling element 311 in this scheme is located downstream of the connection position between the second pipe 32 and the first pipe 31. This means that when the heat pump device is working, after the refrigerant flows from the inlet of the main circuit 301 to the outlet of the main circuit 301, during the process of flowing in the first pipe 31, the refrigerant first passes through the connection position between the second pipe 32 and the first pipe 31, and then continues to flow, passing through the first throttling element 311.

[0039] This solution does not limit the specific number of compressors 10; it can be set to two, three, four, etc. It is understood that the number of economizers 30 is the same as the number of compressors 10.

[0040] In this design, the first heat exchanger 20 is a condenser, and the second heat exchanger 40 is an evaporator.

[0041] It is understood that in this scheme, the refrigerant of the heat pump device may have at least one of the following two circulation paths: the first circulation path is: after passing through the compressor assembly, the first heat exchanger 20, the economizer assembly, and the second heat exchanger 40, it flows back to the compressor assembly; the second circulation path is: after passing through the compressor assembly, the second heat exchanger 40, the economizer assembly, and the first heat exchanger 20, it flows back to the compressor assembly.

[0042] In the first circulation path, the inlet of the main circuit 301 of the economizer 30 is connected to the first heat exchanger 20, and the outlet of the main circuit 301 of the economizer 30 is connected to the second heat exchanger 40 through the first connecting pipe 31. In the second circulation path, the inlet of the main circuit 301 of the economizer 30 is connected to the second heat exchanger 40, and the outlet of the main circuit 301 of the economizer 30 is connected to the first heat exchanger 20 through the first connecting pipe 31.

[0043] In this embodiment, the refrigerant of the heat pump device has only the first circulation path, meaning that the heat pump device only has a cooling function.

[0044] In the first circulation path, the refrigerant vapor is compressed to a high temperature and high pressure state by the compressor assembly. The high temperature and high pressure gaseous refrigerant enters the first heat exchanger 20 (condenser), where it releases heat and condenses into a high pressure liquid refrigerant. The high pressure liquid refrigerant enters the main circuit 301 of the economizer 30, which is in operation. A portion of the refrigerant flowing out of the main circuit 301 flows to the second heat exchanger 40 (evaporator) after passing through the first throttling element 311 on the first connecting pipe 31. The other portion flows to the auxiliary circuit 302 after passing through the second throttling element 321 on the second connecting pipe 32 before passing through the first throttling element 311. Under the action of the second throttling element 321, the liquid refrigerant becomes a gas-liquid mixture. This gas-liquid mixture exchanges heat with the refrigerant in the main circuit 301, which has a higher temperature, so that most of the refrigerant flowing out of the auxiliary circuit 302 becomes a gaseous form and flows into the corresponding compressor 10.

[0045] Furthermore, the economizer assembly also includes a first manifold 331, one end of which is connected to one of the first heat exchanger 20 and the second heat exchanger 40, and the other end is connected to the inlet of the main circuit 301 of the multiple economizers 30. This arrangement can improve the uniformity of refrigerant flow from the first heat exchanger 20 to the main circuit 301 of the multiple economizers 30.

[0046] In this design, the economizer assembly also includes a second manifold 332. One end of the second manifold 332 is connected to the other end of the first heat exchanger 20 and the second heat exchanger 40, and the other end is connected to the outlet of the main circuit 301 of the multiple economizers 30. The second manifold 332 provides a buffer for the refrigerant flowing out of the main circuit 301 of the multiple economizers 30, reducing pressure fluctuations caused by inconsistent pressures among the economizers 30, thereby protecting downstream components and improving the overall reliability of the system.

[0047] Furthermore, in this embodiment of the solution, the heat pump device also includes a gas-liquid separator 80. The gas-liquid separator 80 is disposed on the circulation loop 01. The inlet of the gas-liquid separator 80 is connected to the second heat exchanger 40, and the outlet of the gas-liquid separator 80 is connected to the inlet of the compressor 10. The gas-liquid separator 80 optimizes the refrigerant exiting the second heat exchanger 40 before it enters the compressor 10, thereby increasing the amount of gaseous refrigerant drawn into the compressor 10, further improving the compression efficiency of the compressor 10, and reducing the energy consumption of the compressor 10.

[0048] Furthermore, the heat pump unit also includes a filter section 90, which is located upstream of the economizer 30. The filter section 90 is used to filter the refrigerant flowing into the main circuit 301 of the economizer 30. During long-term operation of the heat pump unit, the refrigerant may contain impurities such as tiny solid particles, dirt, and oil droplets introduced due to wear, corrosion, or contaminants. The filter section 90 can effectively remove these impurities, reducing the possibility of impurities entering downstream components and clogging them, thus maintaining the normal operation and heat exchange efficiency of key components such as the economizer 30, the first heat exchanger 20, and the second heat exchanger 40.

[0049] In some embodiments of this solution, a filter section is provided at the inlet of the main circuit 301 of each economizer 30.

[0050] In this embodiment of the solution, a filter section 90 is provided on the first manifold 331.

[0051] Furthermore, the compressor assembly also includes an oil balance pipe 11, which connects at least two adjacent compressors 10 to balance the liquid refrigerant in the two adjacent compressors 10. In a compressor assembly operating in parallel, the oil level inside each compressor 10 may differ due to factors such as operating status, load changes, and refrigerant temperature and pressure. The oil balance pipe 11 allows the oil levels between adjacent compressors 10 to automatically balance, ensuring that the corresponding compressor 10 maintains a suitable oil level.

[0052] In this embodiment of the solution, any two adjacent compressors 10 are connected by an oil balance pipe 11.

[0053] like Figure 2 and Figure 3 As shown, Embodiment 2 of this utility model provides a heat pump device. The difference from Embodiment 1 is that the refrigerant of the heat pump device in this embodiment has two circulation paths. That is, in this embodiment, the heat pump device has both cooling and heating functions, and the heat pump device can switch between cooling and heating functions. Figure 2 and Figure 3 The arrows in the diagram indicate the direction of refrigerant flow.

[0054] like Figure 2 and Figure 3 As shown, specifically, the inlet of the main circuit 301 may be connected to one of the first openings of the first heat exchanger 20 and the first opening of the second heat exchanger 40.

[0055] When the inlet of the main circuit 301 of the economizer 30 is connected to the first heat exchanger 20, the outlet of the main circuit 301 of the economizer 30 is connected to the second heat exchanger 40 through the first connecting pipe 31, the inlet of the gas-liquid separator 80 is connected to the second heat exchanger 40, and the outlet of the gas-liquid separator 80 is connected to the inlet of the compressor 10.

[0056] When the inlet of the main circuit 301 of the economizer 30 is connected to the second heat exchanger 40, the outlet of the main circuit 301 of the economizer 30 is connected to the first heat exchanger 20 through the first connecting pipe 31, the inlet of the gas-liquid separator 80 is connected to the first heat exchanger 20, and the outlet of the gas-liquid separator 80 is connected to the inlet of the compressor 10.

[0057] Specifically, the heat pump device also includes a reversing valve 50, which is disposed on the circulation loop 01. The reversing valve 50 has a first connected state and a second connected state. When the reversing valve 50 is in the first connected state, the refrigerant in the circulation loop 01 passes through the compressor assembly, the first heat exchanger 20, the economizer assembly, and the second heat exchanger 40 in sequence, and the heat pump device is in a cooling state. When the reversing valve 50 is in the second connected state, the refrigerant in the circulation loop 01 passes through the compressor assembly, the second heat exchanger 40, the economizer assembly, and the first heat exchanger 20 in sequence, and the heat pump device is in a heating state.

[0058] In this embodiment, the reversing valve 50 has ports D, E, C, and S. When the heat pump device is in cooling mode, ports D and C of the reversing valve 50 are connected, ports E and S are connected, the outlet of the compressor 10 is connected to port D of the reversing valve 50, port C of the reversing valve 50 is connected to the first heat exchanger 20, the second heat exchanger 40 is connected to port S of the reversing valve 50, and port E of the reversing valve 50 is connected to the gas-liquid separator 80. When the heat pump device is in heating mode, ports D and E of the reversing valve 50 are connected, ports C and S of the reversing valve 50 are connected, the outlet of the compressor 10 is connected to port D of the reversing valve 50, port E of the reversing valve 50 is connected to the second heat exchanger 40, the first heat exchanger 20 is connected to port C of the reversing valve 50, and port S of the reversing valve 50 is connected to the gas-liquid separator 80.

[0059] Furthermore, the heat pump device also includes a first liquid inlet branch 61 and a first one-way valve 611. One end of the first liquid inlet branch 61 is connected to the first heat exchanger 20, and the other end is connected to the inlet of the main circuit 301 of the multiple economizers 30 respectively. The first one-way valve 611 is provided on the first liquid inlet branch 61 so that the refrigerant flows unidirectionally from the first heat exchanger 20 to the economizer assembly.

[0060] Specifically, the end of the first liquid inlet branch 61 that is away from the first heat exchanger 20 is connected to the end of the first manifold 331 that is away from the multiple economizers 30.

[0061] In this embodiment of the solution, the heat pump device further includes a first liquid outlet branch 62 and a second one-way valve 621. One end of the first liquid outlet branch 62 is connected to a plurality of first pipes 31, and the other end is connected to the second heat exchanger 40. The second one-way valve 621 is provided on the first liquid outlet branch 62 so that the refrigerant flows unidirectionally along the economizer assembly to the second heat exchanger 40.

[0062] Specifically, the end of the first liquid outlet branch 62 that is away from the second heat exchanger 40 is connected to the end of the second manifold 332 that is away from the multiple economizers 30.

[0063] Specifically, when the reversing valve 50 is in the first connected state, i.e., when the heat pump device is in cooling mode, both the first one-way valve 611 and the second one-way valve 621 are open; when the reversing valve 50 is in the second connected state, i.e., when the heat pump device is in heating mode, both the first one-way valve 611 and the second one-way valve 621 are closed. This configuration ensures that when the heat pump device is in cooling mode, the refrigerant in the first heat exchanger 20 flows unidirectionally to the main circuit 301 of the multiple economizers 30, and the refrigerant in the main circuit 301 of the economizers 30 flows unidirectionally to the second heat exchanger 40, preventing unnecessary backflow of refrigerant during system circulation and thus ensuring normal system operation and efficiency.

[0064] Similarly, the heat pump device also includes: a second liquid inlet branch 71, a third one-way valve 711, a second liquid outlet branch 72, and a fourth one-way valve 721. One end of the second liquid inlet branch 71 is connected to the second heat exchanger 40, and the other end is connected to the inlet of the main circuit 301 of multiple economizers 30. The third one-way valve 711 is installed on the second liquid inlet branch 71 to allow refrigerant to flow unidirectionally from the second heat exchanger 40 to the economizer assembly. One end of the second liquid outlet branch 72 is connected to multiple first connecting pipes 31, and the other end is connected to the first heat exchanger 20. The fourth one-way valve 721 is installed on the second liquid outlet branch 72 to allow refrigerant to flow unidirectionally from the economizer assembly to the first heat exchanger 20.

[0065] Specifically, the end of the second liquid inlet branch 71 away from the second heat exchanger 40 is connected to the end of the first manifold 331 away from the multiple economizers 30; the end of the second liquid outlet branch 72 away from the first heat exchanger 20 is connected to the end of the second manifold 332 away from the multiple economizers 30.

[0066] Specifically, when the reversing valve 50 is in the second connected state, both the third one-way valve 711 and the fourth one-way valve 721 are open; when the reversing valve 50 is in the first connected state, both the third one-way valve 711 and the fourth one-way valve 721 are closed. This configuration ensures that when the heat pump is in heating mode, the refrigerant in the second heat exchanger 40 flows unidirectionally to the main circuit 301 of the multiple economizers 30, and the refrigerant in the main circuit 301 of the economizers 30 flows unidirectionally to the first heat exchanger 20. This prevents unnecessary backflow of refrigerant during heat pump circulation, thus ensuring normal system operation and efficiency.

[0067] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0069] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heat pump device, characterized in that, include: The circulation loop (01) and the compressor assembly, the first heat exchanger (20), the economizer assembly and the second heat exchanger (40) disposed on the circulation loop (01); the compressor assembly includes a plurality of compressors (10) arranged in parallel, each compressor (10) having a gas injection port; the economizer assembly includes a plurality of economizers (30) arranged in parallel, the economizers (30) being disposed one-to-one with the compressors (10); Each of the economizers (30) has an independent main circuit (301) and an auxiliary circuit (302). The fluid in the main circuit (301) and the fluid in the auxiliary circuit (302) can exchange heat. The inlet of the main circuit (301) is connected to one of the first heat exchanger (20) and the second heat exchanger (40). The outlet of the main circuit (301) is connected to the other of the first heat exchanger (20) and the second heat exchanger (40) through a first connecting pipe (31). The inlet of the auxiliary circuit (302) is connected to the corresponding first connecting pipe (31) through a second connecting pipe (32). The outlet of the auxiliary circuit (302) is connected to the corresponding air inlet of the compressor (10). The first throttling device (311) is provided on the first pipe (31) corresponding to each of the economizers (30), and the first throttling device (311) is located downstream of the connection position between the second pipe (32) and the first pipe (31); The second throttling element (321) is provided on the second pipe (32) corresponding to each of the economizers (30).

2. The heat pump device according to claim 1, characterized in that, The inlet of the main circuit (301) may be selectively connected to one of the first opening of the first heat exchanger (20) and the first opening of the second heat exchanger (40).

3. The heat pump device according to claim 2, characterized in that, The heat pump device also includes: A reversing valve (50) is provided on the circulation loop (01). The reversing valve (50) has a first connected state and a second connected state. When the reversing valve (50) is in the first connected state, the refrigerant in the circulation loop (01) passes through the compressor assembly, the first heat exchanger (20), the economizer assembly and the second heat exchanger (40) in sequence. When the reversing valve (50) is in the second connected state, the refrigerant in the circulation loop (01) passes through the compressor assembly, the second heat exchanger (40), the economizer assembly and the first heat exchanger (20) in sequence.

4. The heat pump device according to claim 3, characterized in that, The heat pump device also includes: The first liquid inlet branch (61) has one end connected to the first heat exchanger (20) and the other end connected to the inlet of the main circuit (301) of the plurality of economizers (30); A first one-way valve (611) is provided on the first liquid inlet branch (61) to allow the refrigerant to flow unidirectionally from the first heat exchanger (20) to the economizer assembly; The first liquid outlet branch (62) has one end connected to a plurality of first connecting pipes (31) and the other end connected to the second heat exchanger (40); A second one-way valve (621) is provided on the first liquid outlet branch (62) to allow the refrigerant to flow unidirectionally along the direction from the economizer assembly to the second heat exchanger (40); When the reversing valve (50) is in the first connected state, both the first check valve (611) and the second check valve (621) are in the open state; when the reversing valve (50) is in the second connected state, both the first check valve (611) and the second check valve (621) are in the closed state.

5. The heat pump device according to claim 3, characterized in that, The heat pump device also includes: The second liquid inlet branch (71) has one end connected to the second heat exchanger (40) and the other end connected to the inlet of the main circuit (301) of the plurality of economizers (30); A third one-way valve (711) is provided on the second liquid inlet branch (71) to allow the refrigerant to flow unidirectionally from the second heat exchanger (40) to the economizer assembly; The second liquid outlet branch (72) has one end connected to multiple first pipes (31) respectively, and the other end connected to the first heat exchanger (20); A fourth one-way valve (721) is provided on the second liquid outlet branch (72) to allow the refrigerant to flow unidirectionally along the direction from the economizer assembly to the first heat exchanger (20); When the reversing valve (50) is in the second connected state, both the third check valve (711) and the fourth check valve (721) are in the open state; when the reversing valve (50) is in the first connected state, both the third check valve (711) and the fourth check valve (721) are in the closed state.

6. The heat pump device according to claim 1, characterized in that, The heat pump device also includes: A gas-liquid separator (80) is installed on the circulation loop (01). When the inlet of the main loop (301) is connected to the first heat exchanger (20), the inlet of the gas-liquid separator (80) is connected to the second heat exchanger (40), and the outlet of the gas-liquid separator (80) is connected to the inlet of the compressor (10). When the inlet of the main loop (301) is connected to the second heat exchanger (40), the inlet of the gas-liquid separator (80) is connected to the first heat exchanger (20), and the outlet of the gas-liquid separator (80) is connected to the inlet of the compressor (10).

7. The heat pump device according to claim 1, characterized in that, The heat pump device also includes: A filter section (90) is provided upstream of the economizer (30), and the filter section (90) is used to filter the refrigerant in the main circuit (301) flowing to the economizer (30).

8. The heat pump device according to claim 1, characterized in that, The economizer component also includes: A first manifold (331), one end of which is connected to one of the first heat exchanger (20) and the second heat exchanger (40), and the other end of which is connected to the inlet of the main circuit (301) of the plurality of economizers (30); and / or, The second manifold (332) has one end connected to the other of the first heat exchanger (20) and the second heat exchanger (40), and the other end connected to the outlet of the main circuit (301) of the plurality of economizers (30).

9. The heat pump device according to claim 1, characterized in that, The compressor assembly also includes: An oil balance pipe (11) is connected between at least two adjacent compressors (10) to balance the liquid refrigerant in the two adjacent compressors (10).

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