An outdoor unit of a heat pump unit

Abstract

The present invention provides an outdoor unit of a heat pump unit, comprising: a fin heat exchanger, including a left end plate, a right end plate and fins, wherein a first heat exchange component and a second heat exchange component are sequentially arranged in the fins from top to bottom, the first heat exchange component includes m first heat exchange copper tubes stacked from top to bottom, and the second heat exchange component includes n second heat exchange copper tubes stacked from top to bottom; a gas collecting pipe, and the first ends of the m first heat exchange copper tubes and the n second heat exchange copper tubes are all connected to the gas collecting pipe; a liquid separation component, including a first liquid separation pipe, a second liquid separation pipe and a first one-way valve, the second liquid separation pipe is connected to the first liquid separation pipe through the first one-way valve, and the flow direction of the first one-way valve is from the second liquid separation pipe to the first liquid separation pipe; the first liquid separation pipe includes a brass distributor, the brass distributor is connected to the second ends of the m first heat exchange copper tubes and the second liquid separation pipe through pipelines, and the second liquid separation pipe is connected to the second ends of the n second heat exchange copper tubes through pipelines, and it has good defrosting effect.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pump units, and particularly to an outdoor unit of a heat pump unit. Background Art

[0002] The fin heat exchanger has advantages such as a large heat dissipation area and high heat dissipation efficiency, and is widely used as an evaporator in heat pump units; however, in actual applications, when the outdoor unit of the heat pump unit operates in low-temperature or high-humidity conditions, its fin heat exchanger is prone to frosting. At this time, in order to ensure the heat exchange effect of the fin heat exchanger, defrosting of the fin heat exchanger is required.

[0003] During the operation of the outdoor unit of the heat pump unit, the air field distribution of its fin heat exchanger is uneven, resulting in a greater frosting thickness at the lower part of the fin heat exchanger than at the upper part. At this time, in order to enable the upper and lower parts of the fin heat exchanger to have the same defrosting effect, it often uses liquid distribution pipes of different lengths to defrost the upper and lower parts of the fin heat exchanger. However, due to the different lengths of the liquid distribution pipes, it will cause uneven heat exchange effects of the fin heat exchanger, affecting the heating effect of the outdoor unit. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide an outdoor unit of a heat pump unit, which can enable the fin heat exchanger to have a good heat exchange effect while having a good defrosting effect.

[0005] The specific content of the technical solution adopted by the present invention is as follows:

[0006] An outdoor unit of a heat pump unit, comprising:

[0007] A fin heat exchanger, the fin heat exchanger includes a left end plate, a right end plate, and fins connected between the left end plate and the right end plate. A first heat exchange component and a second heat exchange component are sequentially arranged in the fins from top to bottom. The first heat exchange component includes m first heat exchange copper pipes stacked from top to bottom, and the second heat exchange component includes n second heat exchange copper pipes stacked from top to bottom, where: m > n, and both m and n are constants greater than 1;

[0008] A header pipe, and the first ends of the m first heat exchange copper pipes and the n second heat exchange copper pipes are all connected to the header pipe;

[0009] Liquid separation component, the liquid separation component includes a first liquid separation pipe, a second liquid separation pipe and a first one-way valve, the second liquid separation pipe is connected to the first liquid separation pipe through the first one-way valve, and the flow direction of the first one-way valve is from the second liquid separation pipe to the first liquid separation pipe; the first liquid separation pipe includes a brass distributor, the brass distributor is connected to the second ends of m first heat exchange copper pipes and the second liquid separation pipe through pipelines, and the second liquid separation pipe is connected to the second ends of n second heat exchange copper pipes through pipelines.

[0010] Further, the liquid separation component further includes m first refrigerant pipes, n second refrigerant pipes and n third refrigerant pipes, and n three-way valves are sequentially arranged on the second liquid separation pipe from top to bottom;

[0011] The m first refrigerant pipes are respectively connected between the brass distributor and the second ends of the m first heat exchange copper pipes; the n second refrigerant pipes are respectively connected between the brass distributor and the n three-way valves; the n third refrigerant pipes are respectively connected between the n three-way valves and the second ends of the n second heat exchange copper pipes.

[0012] Further, the length of the first refrigerant pipe is equal to the sum of the lengths of the second refrigerant pipe and the third refrigerant pipe.

[0013] Further, a third heat exchange copper pipe is further arranged in the fin, and the third heat exchange copper pipe is located below the second heat exchange component; the first end of the third heat exchange copper pipe is connected to the gas collecting pipe, the second end of the third heat exchange copper pipe is connected to the second liquid separation pipe through a fourth refrigerant pipe, and a second one-way valve is arranged on the fourth refrigerant pipe, and the flow direction of the second one-way valve is from the second end of the third heat exchange copper pipe to the second liquid separation pipe.

[0014] Further, the length of the fourth refrigerant pipe is equal to the length of the third refrigerant pipe.

[0015] Further, the first refrigerant pipe, the second refrigerant pipe, the third refrigerant pipe and the fourth refrigerant pipe have the same structure, and the first refrigerant pipe includes a capillary tube and a thermal expansion tube sleeved on the capillary tube.

[0016] Further, the second liquid separation pipe has a U-shaped structure, the second liquid separation pipe includes a first connection end, a second connection end and an arc connection part connected between the first connection end and the second connection end, and the n three-way valves are sequentially arranged on the second connection end from top to bottom, and the first connection end is connected to the first liquid separation pipe through the first one-way valve.

[0017] Further, the bottom end of the first liquid separation pipe is flush with the bottom end of the gas collecting pipe.

[0018] Further, the fin heat exchanger further includes a fixing bracket, and both the header pipe and the first liquid distribution pipe are connected to the left end plate through the fixing bracket.

[0019] Further, the header pipe is connected to the fixing bracket through a first pipe clamp, and the first liquid distribution pipe is connected to the fixing bracket through a second pipe clamp.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. For the outdoor unit of the heat pump unit of the present invention, the brass distributor of the first liquid distribution pipe is connected to the second ends of m first heat exchange copper pipes and the second liquid distribution pipe through pipelines. When the outdoor unit of the heat pump unit operates, the refrigerant in the first liquid distribution pipe will evenly flow to m first heat exchange copper pipes and n second heat exchange copper pipes through the brass distributor, making the refrigerant path lengths flowing to m first heat exchange copper pipes and n second heat exchange copper pipes close, so as to ensure uniform heat exchange in the upper and lower parts of the fin heat exchanger and avoid the serious frosting problem of m first heat exchange copper pipes and n second heat exchange copper pipes due to uneven refrigerant distribution; during defrosting, the refrigerant in n second heat exchange copper pipes will not pass through the brass distributor, which reduces the refrigerant path length in n second heat exchange copper pipes during defrosting, reduces the refrigerant resistance of n second heat exchange copper pipes during defrosting, improves the defrosting effect of the lower part of the fin heat exchanger, enables uniform defrosting of the upper and lower parts of the fin heat exchanger, and improves the defrosting effect of the fin heat exchanger.

[0022] 2. For the outdoor unit of the heat pump unit of the present invention, a second one-way valve is further provided on the fourth refrigerant pipe, and the flow direction of the second one-way valve is from the second end of the third heat exchange copper pipe to the second liquid distribution pipe. It makes the third heat exchange copper pipe not pass through the refrigerant during the heating process but pass through the refrigerant during the defrosting process. On the one hand, when the third heat exchange copper pipe does not pass through the refrigerant during the heating process, it can avoid the icing problem of the third heat exchange copper pipe during the heating process; on the other hand, when the third heat exchange copper pipe passes through the refrigerant during the defrosting process, it can supplement defrosting for n second heat exchange copper pipes close to the third heat exchange copper pipe and improve the defrosting effect of n second heat exchange copper pipes.

[0023] For better understanding and implementation, the present invention will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the outdoor unit of the heat pump unit in an embodiment of the present invention;

[0025] Figure 2 Figure 1 Side view of;

[0026] Figure 3 Structural schematic diagram of a brass distributor;

[0027] Among them, the reference numerals of each attached drawing are as follows:

[0028] 1. Fin heat exchanger; 11. Left end plate; 12. Right end plate; 13. Fins; 14. First heat exchange copper tube; 15. Second heat exchange copper tube; 16. Third heat exchange copper tube; 17. Fixed bracket; 18. First pipe clamp; 19. Second pipe clamp; 2. Gas collecting pipe; 21. Main pipeline; 22. Branch pipeline; 3. Liquid separation component; 31. First liquid separation pipe; 311. Connecting pipe; 312. Three-way pipe; 313. Brass distributor; 32. Second liquid separation pipe; 33. First one-way valve; 34. First refrigerant pipe; 35. Second refrigerant pipe; 36. Third refrigerant pipe; 37. Fourth refrigerant pipe; 38. Three-way valve; 39. Second one-way valve. Specific embodiments

[0029] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the embodiments of the present application.

[0030] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] When the following description relates to the attached drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] In addition, in the description of the present application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0033] It should be understood that the embodiments of the present application are not limited to the exact structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the embodiments of the present application is only limited by the appended claims.

[0034] Finned heat exchangers are widely used in heat pump units because of their large heat dissipation area and high heat dissipation efficiency. When the heat pump unit operates under low-temperature or high-humidity working conditions, the surface of its finned heat exchanger is prone to frosting. In order to avoid the influence of the frost on the heat exchange effect of the finned heat exchanger, when the surface of the finned heat exchanger is frosted, it is necessary to defrost the finned heat exchanger.

[0035] A heat pump unit is a device that transfers the heat pump of a low-temperature heat source to a high-temperature heat source, mainly including a compressor, a condenser, a throttle valve, and an evaporator (such as a finned heat exchanger). When working, the high-temperature and high-pressure refrigerant discharged by the compressor enters the condenser. After the high-temperature and high-pressure refrigerant releases heat, it becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant becomes a low-temperature and low-pressure liquid refrigerant after entering the throttle valve, and then the low-temperature and low-pressure liquid refrigerant becomes a high-temperature and low-pressure gaseous refrigerant after entering the evaporator. This cycle repeats, and the heat absorbed by the evaporator is transmitted to the condenser through the circulating flow of the refrigerant. During this process, when the low-temperature and low-pressure liquid refrigerant absorbs heat from the air in the evaporator and becomes a high-temperature and low-pressure gaseous refrigerant, frosting or icing will occur on the surface of the evaporator. When the thickness of the frosting or icing on the surface of the evaporator is too thick, it will affect the heat exchange effect of the evaporator. Therefore, it is necessary to defrost the evaporator regularly.

[0036] Moreover, due to the uneven wind field passing through the evaporator, the frosting thickness at the lower part of the evaporator is higher than that at the upper part of the evaporator. Therefore, when the flow path lengths of the refrigerant in different heat exchange copper tubes of the evaporator are the same during defrosting, the lower part of the evaporator cannot be completely defrosted, affecting the defrosting effect of the evaporator.

[0037] Based on this, referring to Figures 1 - 3 , this embodiment provides an outdoor unit of a heat pump unit, including:

[0038] Finned heat exchanger 1, the finned heat exchanger 1 includes a left end plate 11, a right end plate 12, and fins 13 connected between the left end plate 11 and the right end plate 12. A first heat exchange component and a second heat exchange component are sequentially arranged in the fins 13 from top to bottom. The first heat exchange component includes m first heat exchange copper tubes 14 stacked from top to bottom, and the second heat exchange component includes n second heat exchange copper tubes 15 stacked from top to bottom, where: m > n, and both m and n are constants greater than 1.

[0039] Gas collecting pipe 2, the first ends of the m first heat exchange copper tubes 14 and the n second heat exchange copper tubes 15 are all connected to the gas collecting pipe 2.

[0040] Liquid separation component 3, the liquid separation component 3 includes a first liquid separation pipe 31, a second liquid separation pipe 32, and a first one-way valve 33. The second liquid separation pipe 32 is connected to the first liquid separation pipe 31 through the first one-way valve 33, and the flow direction of the first one-way valve 33 is from the second liquid separation pipe 32 to the first liquid separation pipe 31; the first liquid separation pipe 31 includes a brass distributor 313, and the brass distributor 313 is connected to the second ends of the m first heat exchange copper tubes 14 and the second liquid separation pipe 32 through pipelines, and the second liquid separation pipe 32 is connected to the second ends of the n second heat exchange copper tubes 15 through pipelines.

[0041] Since the brass distributor 313 is connected to the second ends of the m first heat exchange copper tubes 14 and the second liquid separation pipe 32 through pipelines, and the second liquid separation pipe 32 is connected to the second ends of the n second heat exchange copper tubes 15 through pipelines, therefore, the refrigerant flowing out of the brass distributor 313 will evenly flow to the second ends of the m first heat exchange copper tubes 14 and the second ends of the n second heat exchange copper tubes 15 to ensure that the refrigerant path lengths of the m first heat exchange copper tubes 14 and the n second heat exchange copper tubes 15 are close, so that the heat exchange of the upper and lower parts of the finned heat exchanger 1 is uniform; moreover, since the second liquid separation pipe 32 is connected to the first liquid separation pipe 31 through the first one-way valve 33, during defrosting, the refrigerant flowing through the n second heat exchange copper tubes 15 will not flow through the brass distributor 313, which reduces the refrigerant path length of the n second heat exchange copper tubes 15 during defrosting, reduces the refrigerant resistance of the n second heat exchange copper tubes 15 during defrosting, improves the defrosting effect of the lower part of the finned heat exchanger 1, enables the upper and lower parts of the finned heat exchanger 1 to be evenly defrosted, and improves the defrosting effect of the finned heat exchanger 1.

[0042] In this embodiment, the liquid separation assembly 3 further includes m first refrigerant pipes 34, n second refrigerant pipes 35 and n third refrigerant pipes 36. n three-way valves 38 are sequentially arranged on the second liquid separation pipe 32 from top to bottom; the m first refrigerant pipes 34 are respectively connected between the brass distributor 313 and the second ends of the m first heat exchange copper pipes 14; the n second refrigerant pipes 35 are respectively connected between the brass distributor 313 and the n three-way valves 38; the n third refrigerant pipes 36 are respectively connected between the n three-way valves 38 and the second ends of the n second heat exchange copper pipes 15.

[0043] In this embodiment, the three-way valve 38 includes a first connection end for connecting the second liquid separation pipe 32, a second connection end for connecting the second refrigerant pipe 35, and a third connection end for connecting the third refrigerant pipe 36. The first liquid separation pipe 31 further includes a three-way pipe 312 and a communication pipe 311. The three-way pipe 312 includes a fourth connection end for connecting the top end of the communication pipe 311, a fifth connection end for connecting the bottom end of the brass distributor 313, and a sixth connection end for connecting the first one-way valve 33.

[0044] During heating, the low-temperature and low-pressure liquid refrigerant flows through the communication pipe 311 and the three-way pipe 312 and then enters the brass distributor 313; then, part of the refrigerant entering the brass distributor 313 flows through the m first refrigerant pipes 34 to the m first heat exchange copper pipes 14 respectively, and the other part of the refrigerant entering the brass distributor 313 flows through the n second refrigerant pipes 35, the n three-way valves 38 and the n third refrigerant pipes 36 respectively and then flows to the n second heat exchange copper pipes 15; then, the refrigerant entering the m first heat exchange copper pipes 14 and the n second heat exchange copper pipes 15 flows to the gas collecting pipe 2.

[0045] During defrosting, the refrigerant flowing out of the second ends of the n second heat exchange copper pipes 15 will flow through the third refrigerant pipe 36, the third connection end, the three-way valve 38 and the second connection end in sequence and then converge in the second liquid separation pipe 32. Then, the converged refrigerant flows through the first one-way valve 33, the sixth connection end, the three-way pipe 312, the fourth connection end and the communication pipe 311 in sequence and then flows out. This enables the refrigerant flowing out of the second heat exchange copper pipes 15 not to flow through the brass distributor 313 during defrosting, reduces the refrigerant resistance of the n second heat exchange copper pipes 15 during defrosting, improves the defrosting effect of the lower part of the finned heat exchanger 1, enables the upper and lower parts of the finned heat exchanger 1 to defrost evenly, and improves the defrosting effect of the finned heat exchanger.

[0046] In this embodiment, a plurality of openings are evenly arranged at the top of the brass distributor 313, and the number of the openings is equal to the sum of the numbers of the first heat exchange copper tubes 14 and the second heat exchange copper tubes 15. When connecting, the two ends of the first refrigerant pipe 34 are respectively connected to the opening and the second end of the first heat exchange copper tube 14, the two ends of the second refrigerant pipe 35 are respectively connected to the opening and the first connection end of the three-way valve 38, and the two ends of the third refrigerant pipe 36 are respectively connected to the third connection end of the three-way valve 38 and the second end of the second heat exchange copper tube 15.

[0047] In this embodiment, the length of the first refrigerant pipe 34 is equal to the sum of the lengths of the second refrigerant pipe 35 and the third refrigerant pipe 36, which can ensure that the path lengths of the refrigerant flowing from the brass distributor 313 to the m first heat exchange copper tubes 14 are equal to the path lengths of the refrigerant flowing to the n second heat exchange copper tubes 15, and ensure uniform heat exchange in the upper and lower parts of the fin heat exchanger 1. When defrosting, the path length of the refrigerant flowing through the n second heat exchange copper tubes 15 is smaller than the path length of the refrigerant flowing through the m first heat exchange copper tubes 14 by the length of the second refrigerant pipe 35, so as to improve the defrosting effect of the lower part of the fin heat exchanger 1.

[0048] Moreover, since the length of the third refrigerant pipe 36 is related to the defrosting flow rate of the refrigerant in the second heat exchange copper tube 15, if the length of the third refrigerant pipe 36 is too short, it is easy to cause a reduction in the refrigerant in the first heat exchange copper tube 14, resulting in uneven defrosting in the upper part of the fin heat exchanger 1 and good defrosting effect in the lower part. Therefore, in this embodiment, the length of the third refrigerant pipe 36 is 30%-60% of the length of the first refrigerant pipe 34.

[0049] In this embodiment, a third heat exchange copper tube 16 is further arranged in the fin 13, and the third heat exchange copper tube 16 is located below the second heat exchange component; the first end of the third heat exchange copper tube 16 is connected to the header pipe 2, the second end of the third heat exchange copper tube 16 is connected to the second liquid distribution pipe 32 through a fourth refrigerant pipe 37, and a second one-way valve 39 is arranged on the fourth refrigerant pipe 37, and the flow direction of the second one-way valve 39 is from the second end of the third heat exchange copper tube 16 to the second liquid distribution pipe 32.

[0050] During the defrosting process of the fin heat exchanger 1, the condensed water precipitated from the air will accumulate at the bottom of the fin heat exchanger 1. When the ambient temperature is too low, the condensed water accumulated at the bottom of the fin heat exchanger 1 will freeze. When the fin heat exchanger 1 operates for a long time, the ice formed at its bottom is likely to squeeze the copper pipe of the fin heat exchanger 1, resulting in copper pipe leakage or blockage. Therefore, in this embodiment, a second one-way valve 39 is provided on the fourth refrigerant pipe 37, and the flow direction of the second one-way valve 39 is from the second end of the third heat exchange copper pipe 16 to the second liquid distribution pipe 32. On the one hand, since the third heat exchange copper pipe 16 is located at the bottom of the fin 13 and its heating effect is poor, the second one-way valve 39 provided on the fourth refrigerant pipe 37 can prevent the refrigerant from flowing through the third heat exchange copper pipe 16 when the outdoor unit of the heat pump unit is heating, so as to improve the heat exchange effect of the fin 13. On the other hand, during defrosting, the second one-way valve 39 can allow the refrigerant to flow through the third heat exchange copper pipe 16, so as to melt the ice formed at the bottom of the fin 13 by the flowing refrigerant and supplement defrosting to the second heat exchange copper pipe 15 close to the third heat exchange copper pipe 16, so as to further improve the defrosting effect of the fin 13.

[0051] Referring to Figure 1 and Figure 2 , the gas collecting pipe 2 includes a main pipe 21 and a plurality of branch pipes 22, and the number of the branch pipes 22 is equal to the sum of the numbers of the first heat exchange copper pipes 14, the second heat exchange copper pipes 15 and the third heat exchange copper pipes 16, so that the refrigerant flowing out of m first heat exchange copper pipes 14, n second heat exchange copper pipes 15 and the third heat exchange copper pipe 16 respectively flows through the branch pipes 22 connected thereto to the main pipe 21, and the refrigerant in the main pipe 21 can also flow through the plurality of branch pipes 22 to the m first heat exchange copper pipes 14 and the n second heat exchange copper pipes 15 respectively.

[0052] In this embodiment, the numbers of the first heat exchange copper pipes 14 and the second heat exchange copper pipes 15 are determined according to the operating conditions of the heat pump unit. Generally speaking, When specifically setting, referring to Figure 1, the heat exchange copper tubes between the straight line L1 and the straight line L2 are m of the first heat exchange copper tubes 14, and the heat exchange copper tubes between the straight line L2 and the straight line L3 are n of the second heat exchange copper tubes 15. The structures of the first heat exchange copper tube 14, the second heat exchange copper tube 15 and the third heat exchange copper tube 16 are the same, and they are all spiral structures, and their first ends and second ends both expose the left end plate 11; moreover, the first heat exchange component, the second heat exchange component and the third heat exchange copper tube 16 are arranged in the fin 13 from top to bottom in sequence, and m of the first heat exchange copper tubes 14 are arranged in layers from top to bottom in sequence, and n of the second heat exchange copper tubes are arranged in layers from top to bottom in sequence, which can enable the refrigerant flowing through the fin heat exchanger 1 to flow into or out of m of the first heat exchange copper tubes 14, n of the second heat exchange copper tubes 15 and the third heat exchange copper tube 16 simultaneously, so as to ensure uniform heat exchange in the upper, middle and lower parts of the fin heat exchanger 1.

[0053] In this embodiment, the length of the fourth refrigerant pipe 37 is equal to the length of the third refrigerant pipe 36, which can ensure that the refrigerant path lengths of n of the second heat exchange copper tubes 15 are equal to the refrigerant path length of the third heat exchange copper tube 16, so as to further improve the defrosting effect at the bottom of the fin heat exchanger 1.

[0054] In this embodiment, the structures of the first refrigerant pipe 34, the second refrigerant pipe 35, the third refrigerant pipe 36 and the fourth refrigerant pipe 37 are the same, and the first refrigerant pipe 34 includes a capillary tube and a thermal expansion tube sleeved on the capillary tube.

[0055] Since the third refrigerant pipe 36 includes a capillary tube, and the diameter of the capillary tube is smaller than the diameter of the second liquid distribution pipe 32, the resistance of the refrigerant in the third refrigerant pipe 36 is greater than the resistance of the refrigerant in the second liquid distribution pipe 32. Therefore, during defrosting, the refrigerant flowing out of n of the second heat exchange copper tubes 15 will enter the second liquid distribution pipe 32, thereby reducing the refrigerant defrosting resistance of n of the second heat exchange copper tubes 15 at the lower part of the fin heat exchanger, and further improving the defrosting effect of the fin heat exchanger 1.

[0056] Refer to Figures 1 - 3 , the second liquid distribution pipe 32 is in a U-shaped structure. The second liquid distribution pipe 32 includes a first connection end, a second connection end and an arc connection part connecting between the first connection end and the second connection end. n of the three-way valves 38 are arranged on the second connection end from top to bottom in sequence, and the first connection end is connected to the first liquid distribution pipe 31 through the first one-way valve 33. Since the second liquid distribution pipe 32 is in a U-shaped structure, it can make the refrigerant flowing out of n of the second heat exchange copper tubes 15 and the refrigerant flowing out of the third heat exchange copper tube 16 be fully mixed in the second liquid distribution pipe 32, so that the temperature of the refrigerant flowing out of the connecting pipe 311 is more uniform.

[0057] In this embodiment, the bottom end of the first liquid separation pipe 31 is flush with the bottom end of the gas collecting pipe 2. Specifically, when setting, the bottom end of the connecting pipe 311 is flush with the bottom end of the gas collecting pipe 2, which facilitates the connection between the gas collecting pipe 2, the connecting pipe 311 and the compressor of the heat pump unit.

[0058] In this embodiment, referring to Figure 1 and Figure 2 , the fin heat exchanger 1 further includes a fixing bracket 17. Both the gas collecting pipe 2 and the first liquid separation pipe 31 are connected to the left end plate 11 through the fixing bracket 17. Specifically, one end of the fixing bracket 17 is connected to the left end plate 11. The gas collecting pipe 2 is connected to the fixing bracket 17 through a first pipe clamp 18, and the first liquid separation pipe 31 is connected to the fixing bracket 17 through a second pipe clamp 19. Moreover, the first pipe clamp 18 and the second pipe clamp 19 have the same structure and are both in a U-shaped structure.

[0059] The present invention also provides a heat pump unit, including the outdoor unit of the heat pump unit described in the present invention. It should be noted that the heat pump unit further includes a compressor, a condenser, a throttle valve, etc.

[0060] When the heat pump unit is heating, the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor enters the condenser to release heat and then becomes a low-temperature and high-pressure liquid refrigerant. Then, the low-temperature and high-pressure liquid refrigerant flows through the throttle valve and becomes a low-temperature and low-pressure liquid refrigerant. Then, the low-temperature and low-pressure liquid refrigerant flows through the connecting pipe 311 and the three-way pipe 312 and enters the brass distributor 313. Then, part of the refrigerant entering the brass distributor 313 flows to m first heat exchange copper pipes 14 through m first refrigerant pipes 34 respectively, and another part of the refrigerant entering the brass distributor 313 flows through n second refrigerant pipes 35, n three-way valves 38 and n third refrigerant pipes 36 to n second heat exchange copper pipes 15. Then, the refrigerant entering the m first heat exchange copper pipes 14 and the n second heat exchange copper pipes 15 flows to the gas collecting pipe 2. Then, the refrigerant entering the gas collecting pipe 2 flows to the compressor, and so on in a cycle to complete the heating.

[0061] When the heat pump unit defrosts the fin heat exchanger 1, the high-temperature and high-pressure gaseous refrigerant flowing out of the compressor flows through the header pipe 2 and then into the fin heat exchanger 1 to release heat and becomes a low-temperature and high-pressure liquid refrigerant. Among them: part of the refrigerant sequentially flows through m first heat exchange copper tubes 14, the brass distributor 313 and the three-way pipe 312 and flows towards the connecting pipe 311; part of the refrigerant respectively flows through n second heat exchange copper tubes 15, n third refrigerant pipes 36 and n three-way valves 38 and then flows towards the second liquid distribution pipe 32, and the remaining part of the refrigerant flows through the third heat exchange copper tube 16 and the fourth refrigerant pipe 37 and then flows towards the second liquid distribution pipe 32. The refrigerant flowing towards the second liquid distribution pipe 32 is mixed and then flows through the first one-way valve 33 and the three-way pipe 312 and then flows towards the connecting pipe 311; then, the low-temperature and high-pressure liquid refrigerant flowing out of the connecting pipe 311 becomes a low-temperature and low-pressure liquid refrigerant after flowing through the throttle valve; then, the low-temperature and low-pressure liquid refrigerant enters the condenser to absorb heat and becomes a high-temperature and low-pressure liquid refrigerant; then, the high-temperature and low-pressure liquid refrigerant enters the compressor and becomes a high-temperature and high-pressure gaseous refrigerant. In this way, the cycle is repeated to complete the defrosting of the fin heat exchanger 1.

[0062] The above embodiments only represent the preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and the present invention also intends to include these modifications and deformations.

Claims

1. An outdoor unit of a heat pump unit, characterized in that, Comprising: A finned heat exchanger, which includes a left end plate, a right end plate, and fins connected between the left end plate and the right end plate. A first heat exchange component and a second heat exchange component are sequentially arranged in the fins from top to bottom. The first heat exchange component includes m first heat exchange copper tubes stacked from top to bottom, and the second heat exchange component includes n second heat exchange copper tubes stacked from top to bottom, where: m > n, and both m and n are constants greater than 1; A gas collecting pipe, and the first ends of the m first heat exchange copper tubes and the n second heat exchange copper tubes are all connected to the gas collecting pipe; A liquid separation component, which includes a first liquid separation pipe, a second liquid separation pipe, and a first one-way valve. The second liquid separation pipe is connected to the first liquid separation pipe through the first one-way valve, and the flow direction of the first one-way valve is from the second liquid separation pipe to the first liquid separation pipe; the first liquid separation pipe includes a brass distributor, and the brass distributor is connected to the second ends of the m first heat exchange copper tubes and the second liquid separation pipe through pipelines, and the second liquid separation pipe is connected to the second ends of the n second heat exchange copper tubes through pipelines; The liquid separation component further includes m first refrigerant pipes, n second refrigerant pipes, and n third refrigerant pipes, and n three-way valves are sequentially arranged on the second liquid separation pipe from top to bottom; The m first refrigerant pipes are respectively connected between the brass distributor and the second ends of the m first heat exchange copper tubes; the n second refrigerant pipes are respectively connected between the brass distributor and the n three-way valves; the n third refrigerant pipes are respectively connected between the n three-way valves and the second ends of the n second heat exchange copper tubes; The length of the first refrigerant pipe is equal to the sum of the lengths of the second refrigerant pipe and the third refrigerant pipe.

2. The outdoor unit of the heat pump unit according to claim 1, characterized in that: A third heat exchange copper tube is further arranged in the fins, and the third heat exchange copper tube is located below the second heat exchange component; the first end of the third heat exchange copper tube is connected to the gas collecting pipe, and the second end of the third heat exchange copper tube is connected to the second liquid separation pipe through a fourth refrigerant pipe. A second one-way valve is arranged on the fourth refrigerant pipe, and the flow direction of the second one-way valve is from the second end of the third heat exchange copper tube to the second liquid separation pipe.

3. The outdoor unit of the heat pump unit according to claim 2, characterized in that: The length of the fourth refrigerant pipe is equal to the length of the third refrigerant pipe.

4. The outdoor unit of the heat pump unit according to claim 2, characterized in that: The first refrigerant pipe, the second refrigerant pipe, the third refrigerant pipe, and the fourth refrigerant pipe have the same structure, and the first refrigerant pipe includes a capillary tube and a thermal expansion tube sleeved on the capillary tube.

5. The outdoor unit of the heat pump unit according to claim 1, characterized in that: The second liquid separation pipe has a U-shaped structure, and the second liquid separation pipe includes a first connection end, a second connection end, and an arc-shaped connection part connecting the first connection end and the second connection end. The n three-way valves are sequentially arranged on the second connection end from top to bottom, and the first connection end is connected to the first liquid separation pipe through the first one-way valve.

6. The outdoor unit of the heat pump unit according to claim 1, characterized in that: The bottom end of the first liquid separation pipe is flush with the bottom end of the gas collecting pipe.

7. The outdoor unit of the heat pump unit according to any one of claims 1-6, characterized in that: The finned heat exchanger further includes a fixing bracket, and both the gas collecting pipe and the first liquid separation pipe are connected to the left end plate through the fixing bracket.

8. The outdoor unit of the heat pump unit according to claim 7, characterized in that: The gas collecting pipe is connected to the fixing bracket through a first pipe clamp, and the first liquid separation pipe is connected to the fixing bracket through a second pipe clamp.

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