CN218991878U - Oil-gas separation structure and heat pump compressor - Google Patents

Abstract

The application relates to an oil-gas separation structure and a heat pump compressor. The oil-gas separation structure comprises a first oil-gas separation pipe and a second oil-gas separation pipe. The second oil-gas separation pipe is arranged along the vertical direction, the first oil-gas separation pipe is communicated with a preset height position of the second oil-gas separation pipe, a part, which is higher than the preset height position, of the second oil-gas separation pipe is defined as an air outlet section, a part, which is lower than the preset height position, of the second oil-gas separation pipe is defined as an oil return section, the axial direction of the first oil-gas separation pipe and the axial direction of the air outlet section are arranged at an included angle, the included angle A between the air outlet direction of the first oil-gas separation pipe and the air outlet direction of the air outlet section is met, and 90 degrees < A <180 degrees. The oil-gas separation structure and the heat pump compressor provided by the application solve the problem that the oil-gas separation tube has poor separation effect on the oil-gas mixture because the interference of the inner wall of the oil-gas separation tube on the oil-gas mixture is small.

Description

Oil-gas separation structure and heat pump compressor

Technical Field

The application relates to the technical field of compressors, in particular to an oil-gas separation structure and a heat pump compressor.

Background

In the technical field of compressors, lubrication of parts plays a vital role in performance and service life of the heat pump compressor in the operation process of the heat pump compressor. On the one hand, the refrigerating oil plays roles of heat conduction, friction reduction, abrasion reduction and noise reduction. On the other hand, the freezing oil forms an oil film at the interfaces of different cavities of the heat pump compressor, and the oil film can isolate the gases in different pressure cavities so as to play a role in radial sealing. The refrigeration oil in the heat pump compressor exists in the form of liquid oil mist and is mixed with refrigerant gas to form an oil-gas mixture, and in the process of exhausting the heat pump compressor, the oil-gas mixture is discharged out of the heat pump compressor through an exhaust port of the heat pump compressor, so that the refrigeration oil in the heat pump compressor is insufficient, and further the friction loss of a friction pair is large and the sealing between the dynamic disc and the static disc is poor. In order to reduce the discharge of the refrigerant oil out of the heat pump compressor, the end cap of the heat pump compressor is typically provided with an oil-gas separation tube. The oil-gas mixture collides with the inner wall of the oil-gas separation pipe to be separated into gaseous refrigerant and liquid frozen oil refrigerant, the gaseous refrigerant and the liquid frozen oil refrigerant are discharged out of the heat pump compressor along the exhaust port, and the frozen oil flows back into the cavity of the heat pump compressor. However, the inner wall of the oil-gas separation pipe has a small interference effect on the oil-gas mixture, so that the oil-gas separation pipe has a poor separation effect on the oil-gas mixture.

Disclosure of Invention

Based on this, it is necessary to provide an oil-gas separation structure and a heat pump compressor, so as to solve the problem that the oil-gas separation tube has poor separation effect on the oil-gas mixture due to the small interference of the inner wall of the oil-gas separation tube on the oil-gas mixture.

The oil-gas separation structure that this application provided includes first oil-gas separation pipe and second oil-gas separation pipe. The second oil-gas separation pipe is arranged along the vertical direction, the first oil-gas separation pipe is communicated with a preset height position of the second oil-gas separation pipe, a part, which is higher than the preset height position, of the second oil-gas separation pipe is defined as an air outlet section, a part, which is lower than the preset height position, of the second oil-gas separation pipe is defined as an oil return section, the axial direction of the first oil-gas separation pipe and the axial direction of the air outlet section are arranged at an included angle, the included angle A between the air outlet direction of the first oil-gas separation pipe and the air outlet direction of the air outlet section is met, and 90 degrees < A <180 degrees.

In one embodiment, 120 A.ltoreq.150. It can be appreciated that the arrangement reduces the assembly difficulty of the first oil-gas separation pipe and the second oil-gas separation pipe, or reduces the processing difficulty of the first oil-gas separation pipe and the second oil-gas separation pipe.

In one embodiment, the second oil-gas separation pipe is provided with an assembly hole, and the first oil-gas separation pipe is inserted into the assembly hole and is in sealing fit with the hole wall of the assembly hole, so that the first oil-gas separation pipe is communicated with the second oil-gas separation pipe. It can be appreciated that the arrangement further reduces the assembly difficulty of the first oil-gas separation pipe and the second oil-gas separation pipe.

In one embodiment, the first oil-gas separation pipe is inserted into one end of the assembly hole and provided with a notch part, and the notch part is communicated with the first oil-gas separation pipe and the second oil-gas separation pipe. It will be appreciated that the arrangement is such that the oil-gas mixture in the first oil-gas separation tube can enter the second oil-gas separation tube through the notched portion.

In an embodiment, the oil-gas separation structure further comprises an adapter sleeve, one end of the adapter sleeve is connected with the second oil-gas separation tube and is communicated with the assembly hole, the other end of the adapter sleeve extends towards a direction away from the assembly hole, and the adapter sleeve is arranged on the outer side of the first oil-gas separation tube, which is close to one end of the second oil-gas separation tube. It can be appreciated that the arrangement further reduces the assembly difficulty of the first oil-gas separation pipe and the second oil-gas separation pipe, and enhances the tightness of the connection of the first oil-gas separation pipe and the second oil-gas separation pipe.

In an embodiment, the adapter sleeve is provided with a supporting plane, and the supporting plane is stopped at one end of the first oil-gas separation tube inserted into the assembly hole. It can be appreciated that the firm degree of connection of the adapter sleeve and the first oil-gas separation pipe is enhanced by the arrangement.

In one embodiment, the first oil-gas separator tube and the second oil-gas separator tube are of an integrally formed construction. It can be appreciated that the structural strength of the oil-gas separation pipe is enhanced by the arrangement.

The application also provides a heat pump compressor comprising a shell, an end cover and the oil-gas separation structure in any one of the embodiments. The shell is internally provided with an air suction cavity, the end cover is internally provided with a high-pressure cavity communicated with the air suction cavity, the oil-gas separation structure can separate an oil-gas mixture in the high-pressure cavity, and the separated frozen oil flows back to the air suction cavity. It will be appreciated that by doing so, the likelihood of the chilled oil exiting the heat pump compressor is greatly reduced and the chilled oil is caused to form a circulation loop within the heat pump compressor, thereby improving the utilization of the chilled oil.

In one embodiment, the first oil-gas separation pipe is provided with an air inlet communicated with the high-pressure cavity, and the oil return section of the second oil-gas separation pipe is provided with an oil outlet communicated with the air suction cavity. It will be appreciated that the arrangement is such that the oil and gas mixture in the high pressure chamber can enter the first oil and gas separation tube through the inlet port and such that the frozen oil in the return section can flow back into the chamber of the compressor.

In an embodiment, the heat pump compressor further comprises a pressure relief valve, and the pressure relief valve is arranged at one end of the first oil-gas separation tube away from the assembly hole. It will be appreciated that the arrangement is such that the oil and gas mixture in the high pressure chamber can enter the first oil and gas separation tube through the inlet port and that the frozen oil in the return section can flow into the suction chamber through the outlet port.

The application provides an oil-gas separation structure and heat pump compressor, in the oil-gas mixture got into first oil-gas separation pipe, the inner wall of first oil-gas separation pipe is hit to some oil-gas mixture, because the refrigeration oil is oily fog form, the refrigerant is the gaseous state, the density of refrigeration oil fog is greater than the density of gaseous refrigerant, consequently the refrigeration oil fog can adhere to the inner wall of first oil-gas separation pipe and gather into the oil drop, the oil drop flows into the oil return section of second oil-gas separation pipe along the inner wall of first oil-gas separation pipe under the action of gravity, and gaseous refrigerant baffling is walked, and get into in the second oil-gas separation pipe from first oil-gas separation pipe. Thus, the first oil-gas separation of the oil-gas mixture occurs. The other part of the oil-gas mixture enters the second oil-gas separation pipe from the first oil-gas separation pipe and impacts the inner wall of the second oil-gas separation pipe, the frozen oil mist is attached to the inner wall of the second oil-gas separation pipe and is gathered into oil drops, the oil drops flow into an oil return section of the second oil-gas separation pipe under the action of gravity, and gaseous refrigerant is discharged out of the oil-gas separation structure along an exhaust section of the second oil-gas separation pipe, so that the oil-gas mixture is subjected to second oil-gas separation. Through setting up first oil-gas separation pipe and second oil-gas separation pipe, increased the circulation path length of oil-gas mixture in oil-gas separation structure to increased the area of contact of oil-gas mixture with first oil-gas separation pipe inner wall and second oil-gas separation pipe inner wall, and then strengthened the interference of first oil-gas separation pipe inner wall and second oil-gas separation pipe inner wall to oil-gas mixture, thereby improved oil-gas separation structure's oil-gas separation effect.

Further, through setting up the contained angle A that the direction of giving vent to anger of first oil-gas separation pipe and the direction of giving vent to anger of gas section and satisfying, 90 < A <180, the interference effect of second oil-gas separation pipe inner wall to oil-gas mixture when having strengthened the oil-gas mixture from first oil-gas separation pipe entering second oil-gas separation pipe to further improved the oil-gas separation effect of oil-gas separation structure.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a cross-sectional view of a heat pump compressor according to an embodiment provided herein;

FIG. 2 is a schematic diagram of an oil-gas separation structure according to an embodiment of the disclosure;

FIG. 3 is a schematic diagram of an oil-gas separation structure according to another embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a first oil-gas separator tube according to an embodiment of the present disclosure.

Reference numerals: 4. a first oil-gas separation pipe; 41. a notch portion; 42. an air inlet; 5. a second oil-gas separation pipe; 51. an air outlet section; 52. an oil return section; 521. an oil outlet; 53. a fitting hole; 6. an adapter sleeve; 61. a support plane; 7. a housing; 71. an air suction cavity; 8. an end cap; 81. a high pressure chamber; 9. and a pressure release valve.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

In the technical field of heat pump compressors, lubrication of parts plays a vital role in performance and service life of the heat pump compressor in the operation process of the heat pump compressor. On the one hand, the refrigerating oil plays roles of heat conduction, friction reduction, abrasion reduction and noise reduction. On the other hand, the freezing oil forms an oil film at the interfaces of different cavities of the heat pump compressor, and the oil film can isolate the gases in different pressure cavities so as to play a role in radial sealing. The refrigeration oil in the heat pump compressor exists in the form of liquid oil mist and is mixed with refrigerant gas to form an oil-gas mixture, and in the process of exhausting the heat pump compressor, the oil-gas mixture is discharged out of the heat pump compressor through an exhaust port of the heat pump compressor, so that the refrigeration oil in the heat pump compressor is insufficient, and further the friction loss of a friction pair is large and the sealing between the dynamic disc and the static disc is poor. In order to reduce the discharge of the refrigerant oil out of the heat pump compressor, the end cap of the heat pump compressor is typically provided with an oil-gas separation tube. The oil-gas mixture collides with the inner wall of the oil-gas separation pipe to be separated into gaseous refrigerant and liquid frozen oil refrigerant, the gaseous refrigerant and the liquid frozen oil refrigerant are discharged out of the heat pump compressor along the exhaust port, and the frozen oil flows back into the cavity of the heat pump compressor. However, the inner wall of the oil-gas separation pipe has a small interference effect on the oil-gas mixture, so that the oil-gas separation pipe has a poor separation effect on the oil-gas mixture.

In order to solve the problem that the inner wall of oil-gas separation pipe produces less to the interference that leads to the oil-gas separation pipe to oil-gas mixture's separation effect relatively poor, this application provides an oil-gas separation structure and heat pump compressor.

Referring to fig. 1-2, specifically, the oil-gas separation structure includes a first oil-gas separation tube 4 and a second oil-gas separation tube 5, the second oil-gas separation tube 5 is disposed along a vertical direction, the first oil-gas separation tube 4 is communicated with a preset height position of the second oil-gas separation tube 5, a portion of the second oil-gas separation tube 5 higher than the preset height position is defined as an air outlet section 51, a portion of the second oil-gas separation tube 5 lower than the preset height position is defined as an oil return section 52, an axial direction of the first oil-gas separation tube 4 and an axial direction of the air outlet section 51 are disposed at an included angle, and an included angle a between the air outlet direction of the first oil-gas separation tube 4 and the air outlet direction of the air outlet section 51 is satisfied, and 90 ° < a <180 °.

It should be noted that the "second oil-gas separation pipe 5 is disposed along the vertical direction" includes two cases where the second oil-gas separation pipe 5 is disposed along the vertical direction and an included angle formed between the axial direction of the second oil-gas pipe and the vertical direction.

The oil-gas mixture enters the first oil-gas separation pipe 4, a part of the oil-gas mixture impacts the inner wall of the first oil-gas separation pipe 4, the refrigerant is in a gaseous state because the frozen oil is in an oil mist state, the density of the frozen oil mist is greater than that of the gaseous refrigerant, therefore, the frozen oil mist can be attached to the inner wall of the first oil-gas separation pipe 4 and is gathered into oil drops, the oil drops flow into an oil return section 52 of the second oil-gas separation pipe 5 along the inner wall of the first oil-gas separation pipe 4 under the action of gravity, and the gaseous refrigerant is baffled and flows away and enters the second oil-gas separation pipe 5 from the first oil-gas separation pipe 4. Thus, the first oil-gas separation of the oil-gas mixture occurs. The other part of the oil-gas mixture enters the second oil-gas separation pipe 5 from the first oil-gas separation pipe 4 and impacts the inner wall of the second oil-gas separation pipe 5, the frozen oil mist is attached to the inner wall of the second oil-gas separation pipe 5 and is gathered into oil drops, the oil drops flow into an oil return section 52 of the second oil-gas separation pipe 5 under the action of gravity, and the gaseous refrigerant is discharged out of the oil-gas separation structure along an exhaust section of the second oil-gas separation pipe 5, so that the oil-gas mixture is subjected to second oil-gas separation. Through setting up first oil-gas separation pipe 4 and second oil-gas separation pipe 5, increased the circulation path length of oil-gas mixture in oil-gas separation structure to increased the area of contact of oil-gas mixture with first oil-gas separation pipe 4 inner wall and second oil-gas separation pipe 5 inner wall, and then strengthened the interference of first oil-gas separation pipe 4 inner wall and second oil-gas separation pipe 5 inner wall to oil-gas mixture, thereby improved oil-gas separation structure's oil-gas separation effect.

Further, by setting the included angle a between the air outlet direction of the first oil-gas separation tube 4 and the air outlet direction of the air outlet section 51 to be satisfied, 90 ° < a <180 °, the interference effect of the inner wall of the second oil-gas separation tube 5 on the oil-gas mixture when the oil-gas mixture enters the second oil-gas separation tube 5 from the first oil-gas separation tube 4 is enhanced, thereby further improving the oil-gas separation effect of the oil-gas separation structure.

Further, in one embodiment, 120 A.ltoreq.A.ltoreq.150.

By the arrangement, the assembly difficulty of the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 is reduced, or the processing difficulty of the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 is reduced.

In one embodiment, as shown in fig. 3, the second oil-gas separation pipe 5 is provided with a fitting hole 53, and the first oil-gas separation pipe 4 is inserted into the fitting hole 53 and is in sealing fit with the wall of the fitting hole 53, so that the first oil-gas separation pipe 4 communicates with the second oil-gas separation pipe 5.

In this way, the assembly difficulty of the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 is further reduced.

Further, in one embodiment, as shown in fig. 4, a notch 41 is provided at one end of the first oil-gas separation tube 4 inserted into the fitting hole 53, and the notch 41 communicates with the first oil-gas separation tube 4 and the second oil-gas separation tube 5.

By providing the notched portion 41, the oil-gas mixture in the first oil-gas separation pipe 4 can enter the second oil-gas separation pipe 5 through the notched portion 41.

Specifically, the first oil-gas separation pipe 4 is inserted into one end of the fitting hole 53, and the notch portion 41 is machined by turning.

In an embodiment, as shown in fig. 3, the oil-gas separation structure further includes an adapter sleeve 6, one end of the adapter sleeve 6 is connected to the second oil-gas separation tube 5 and is communicated with the assembly hole 53, the other end extends towards a direction away from the assembly hole 53, and the adapter sleeve 6 is sleeved on the outer side of the first oil-gas separation tube 4, which is close to one end of the second oil-gas separation tube 5.

By arranging the adapter sleeve 6, the assembly difficulty of the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 is further reduced, and the tightness of the connection of the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 is enhanced.

Specifically, one end of the adapter sleeve 6 is welded to the outer wall of the second oil-gas separation tube 5, and the inner wall of the other end is welded to the outer wall of the first oil-gas separation tube 4, which is close to one end of the second oil-gas separation tube 5.

Further, in an embodiment, as shown in fig. 3, the adapter sleeve 6 is provided with a supporting plane 61, and the supporting plane 61 is stopped at one end of the first oil-gas separation tube 4 inserted into the assembly hole 53.

By the arrangement, the first oil-gas separation pipe 4 can be prevented from loosening along the axial direction of the first oil-gas separation pipe, so that the firmness of connection of the adapter sleeve 6 and the first oil-gas separation pipe 4 is enhanced.

However, the present utility model is not limited thereto, and in other embodiments, the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 may be integrally formed.

Specifically, the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 are processed by casting molding.

The present application also provides a heat pump compressor, as shown in fig. 1, which includes a casing 7, an end cover 8, and the oil-gas separation structure described in any one of the above embodiments. The shell 7 is internally provided with a suction cavity 71, the end cover 8 is internally provided with a high-pressure cavity 81 communicated with the suction cavity 71, and the oil-gas separation structure can separate the oil-gas mixture in the high-pressure cavity 81 and enable the separated frozen oil to flow back to the suction cavity 71.

Further, in an embodiment, the first oil-gas separation pipe 4, the second oil-gas separation pipe 5 and the end cover 8 are integrally formed.

However, the present utility model is not limited thereto, and in other embodiments, the second oil-gas separation pipe 5 and the end cover 8 may be integrally formed. The first oil-gas separation pipe 4 is inserted into the fitting hole 53 of the second oil-gas separation pipe 5 to communicate with the second oil-gas separation pipe 5.

By the arrangement, the possibility that the refrigerating oil is discharged out of the heat pump compressor is greatly reduced, and the refrigerating oil forms a circulation loop in the heat pump compressor, so that the utilization rate of the refrigerating oil is improved.

Specifically, in one embodiment, as shown in fig. 2, the first oil-gas separation pipe 4 is provided with an air inlet 42 communicating with the high-pressure chamber 81, and the oil return section 52 of the second oil-gas separation pipe 5 is provided with an oil outlet 521 communicating with the suction chamber 71.

In this way, the mixture of oil and gas in the high-pressure chamber 81 is allowed to enter the first oil-gas separation pipe 4 through the air intake port 42, and the frozen oil in the oil return section 52 is allowed to flow into the suction chamber 71 through the oil outlet 521.

But is not limited thereto, in other embodiments, the second oil and gas separation pipe 5 may be provided with an air inlet 42 communicating with the high pressure chamber 81.

In one embodiment, as shown in fig. 2, the heat pump compressor further includes a pressure relief valve 9, and the pressure relief valve 9 is disposed at an end of the first oil-gas separation tube 4 away from the fitting hole 53.

When the air pressure in the heat pump compressor housing 7 is too large, the pressure relief valve 9 is opened to enable the air pressure in the heat pump compressor housing 7 to be in a safe air pressure range, so that the safety of the heat pump compressor is improved. Further, the relief valve 9 is provided at an end of the first oil-gas separation tube 4 remote from the fitting hole 53, thus simplifying the structure of the end cap 8.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. The utility model provides an oil-gas separation structure, its characterized in that includes first oil-gas separation pipe (4) and second oil-gas separation pipe (5), second oil-gas separation pipe (5) are along vertical direction setting, first oil-gas separation pipe (4) communicate in the preset high position of second oil-gas separation pipe (5), define the part that second oil-gas separation pipe (5) are higher than preset high position is gas outlet section (51), define the part that second oil-gas separation pipe (5) are lower than preset high position is oil return section (52), the axial of first oil-gas separation pipe (4) with the axial of gas outlet section (51) is the contained angle setting, just the contained angle A of the gas outlet direction of first oil-gas separation pipe (4) with the gas outlet direction of gas outlet section (51) satisfies, 90 is < A < 180.

2. The oil and gas separation structure of claim 1, wherein 120 ° or less a or less than 150 °.

3. The oil-gas separation structure according to claim 1, wherein the second oil-gas separation pipe (5) is provided with a fitting hole (53), and the first oil-gas separation pipe (4) is inserted into the fitting hole (53) and is in sealing fit with a hole wall of the fitting hole (53) so that the first oil-gas separation pipe (4) is communicated with the second oil-gas separation pipe (5).

4. A gas-oil separation structure according to claim 3, wherein the first gas-oil separation pipe (4) is inserted into one end of the fitting hole (53) and provided with a notch portion (41), and the notch portion (41) communicates the first gas-oil separation pipe (4) and the second gas-oil separation pipe (5).

5. The oil-gas separation structure according to claim 3, further comprising an adapter sleeve (6), wherein one end of the adapter sleeve (6) is connected with the second oil-gas separation pipe (5) and is communicated with the assembly hole (53), the other end of the adapter sleeve extends towards a direction away from the assembly hole (53), and the adapter sleeve (6) is sleeved on the outer side, close to one end of the second oil-gas separation pipe (5), of the first oil-gas separation pipe (4).

6. The oil-gas separation structure according to claim 5, characterized in that the adapter sleeve (6) is provided with a supporting plane (61), the supporting plane (61) is stopped at one end of the first oil-gas separation tube (4) inserted into the assembly hole (53).

7. The oil-gas separation structure according to claim 1, characterized in that the first oil-gas separation pipe (4) and the second oil-gas separation pipe (5) are of an integrally formed structure.

8. A heat pump compressor, characterized by comprising a shell (7), an end cover (8) and an oil-gas separation structure according to any one of claims 3-6, wherein a suction cavity (71) is arranged in the shell (7), a high-pressure cavity (81) communicated with the suction cavity (71) is arranged in the end cover (8), and the oil-gas separation structure can separate an oil-gas mixture in the high-pressure cavity (81) and enable separated refrigerating oil to flow back to the suction cavity (71).

9. Heat pump compressor according to claim 8, characterized in that the first oil and gas separation tube (4) is provided with an air inlet (42) communicating with the high pressure chamber (81), and the oil return section (52) of the second oil and gas separation tube (5) is provided with an oil outlet (521) communicating with the suction chamber (71).

10. The heat pump compressor as recited in claim 9, further comprising a pressure relief valve (9), the pressure relief valve (9) being provided at an end of the first oil-gas separation tube (4) remote from the fitting hole (53).

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