Oil-gas separation structure and heat pump compressor

Abstract

This application relates to an oil-gas separation structure and a heat pump compressor. The oil-gas separation structure includes an oil-gas separation pipe and an oil separator, with the oil-gas separation pipe having an inner cavity. The oil separator is located within the inner cavity, and the oil separator and the inner wall of the inner cavity form an oil-gas separation channel. The cross-sectional area of ​​the oil-gas separation channel changes periodically and gradually along the length of the oil-gas separation pipe; or, the flow direction of the oil-gas separation channel changes periodically and gradually along the length of the oil-gas separation pipe. The oil-gas separation structure and heat pump compressor provided by this application solve the problem that oil-gas separation structures easily lead to excessive pressure drop of the separated gaseous refrigerant.

Description

Technical Field

[0001] This application relates to the field of heat pump compressor technology, and in particular to an oil-gas separation structure and a heat pump compressor. Background Technology

[0002] In the field of heat pump compressor technology, the lubrication of components plays a crucial role in the performance and service life of heat pump compressors during operation. On the one hand, refrigerant oil serves to conduct heat, reduce friction, decrease wear, and reduce noise. On the other hand, refrigerant oil forms an oil film at the interface between different chambers of the heat pump compressor, which can isolate the gas in different pressure chambers, thus providing a radial seal. The refrigerant oil in a heat pump compressor mainly exists in the form of liquid oil mist, mixing with refrigerant gas to form an oil-gas mixture. During the discharge process of the heat pump compressor, this oil-gas mixture is discharged through the exhaust port. This can lead to insufficient refrigerant oil in the compressor, resulting in greater frictional losses in the friction pairs and poor sealing between the moving and stationary discs. To reduce the amount of refrigerant oil discharged from the heat pump compressor, the end cover of the compressor typically has an oil-gas separation structure to separate the oil-gas mixture. This oil-gas separation structure includes an oil separator to enhance the oil-gas separation effect; however, the oil separator can easily lead to excessive pressure drop of the separated gaseous refrigerant. Summary of the Invention

[0003] Therefore, it is necessary to provide an oil-gas separation structure and a heat pump compressor to solve the problem that the oil-gas separation structure can easily lead to excessive pressure drop of the separated gaseous refrigerant.

[0004] Specifically, the oil-gas separation structure includes an oil-gas separation pipe and an oil separator, with the oil-gas separation pipe having an inner cavity. The oil separator is located within the inner cavity, and the oil separator and the inner wall of the inner cavity form an oil-gas separation channel. The cross-sectional area of ​​the oil-gas separation channel changes periodically and gradually along the length of the oil-gas separation pipe; or, the flow direction of the oil-gas separation channel changes periodically and gradually along the length of the oil-gas separation pipe.

[0005] In one embodiment, the oil separator is plate-shaped and extends in a wavy pattern along the length of the oil-gas separation pipe, dividing the inner cavity into a first separation channel and a second separation channel. Along the length of the oil-gas separation pipe, the cross-sectional areas of both the first and second separation channels vary in a wavy pattern, and at any cross-sectional position of the oil-gas separation pipe, the sum of the cross-sectional areas of the first and second separation channels is less than or equal to the total cross-sectional area of ​​the entire oil-gas separation channel. It is understood that this configuration improves the oil-gas separation efficiency of the oil-gas separation structure. Furthermore, the plate-shaped oil separator is easy to manufacture.

[0006] In one embodiment, when the cross-sectional area of ​​the first separation channel or the cross-sectional area of ​​the second separation channel completes one cycle change, the extension length of the oil separator is defined as one section, and the number of sections 'a' of the oil separator satisfies 1 ≤ a ≤ 8. It is understood that this configuration enhances the oil-gas separation effect of the oil separator and avoids excessive energy loss by the gaseous refrigerant.

[0007] In one embodiment, the oil separator is cylindrical, and its periphery is provided with spiral grooves extending along the length of the oil-gas separation pipe. The spiral grooves and the inner wall of the inner cavity cooperate to form an oil-gas separation channel. It is understood that with this configuration, the spiral grooves have a good separation effect on the oil-gas mixture.

[0008] In one embodiment, the oil separator includes a main body and a spiral protrusion, the spiral protrusion forming a spiral groove around the periphery of the main body. It is understood that this arrangement reduces the machining difficulty of the spiral groove.

[0009] In one embodiment, the cross-section of the spiral groove is square; or, the cross-section of the spiral groove is conical, and the cross-sectional area of ​​the spiral groove gradually increases from the direction near the main body to the direction away from the main body. It is understood that this configuration further reduces the processing difficulty of the spiral groove. Or, it further reduces the energy loss of the gaseous refrigerant.

[0010] In one embodiment, the length of the spiral groove extending one revolution radially along the inner cavity is defined as a segment, and the number of segments b of the oil separator satisfies 1 ≤ b ≤ 8. It can be understood that this setting can enhance the oil-gas separation effect of the oil separator and avoid excessive energy loss of gaseous refrigerant.

[0011] In one embodiment, the oil separator is plate-shaped and extends spirally along the length of the oil-gas separation pipe, with one end of the oil separator recessed to form a spiral groove. It is understood that this design simplifies the structure of the oil separator.

[0012] In one embodiment, the oil separator has a spiral groove at one end that is press-fitted to the inner wall of the inner cavity, and an intermediate channel is formed at the end of the oil separator opposite to the spiral groove. At any cross-sectional position of the oil-gas separation pipe, the sum of the cross-sectional areas of the spiral groove and the intermediate channel is equal to the cross-sectional area of ​​the entire oil-gas separation channel. It is understood that with this configuration, the oil-gas mixture can undergo oil-gas separation simultaneously in the spiral groove and the intermediate channel, thereby improving the oil-gas separation efficiency of the oil-gas separation structure.

[0013] This application also provides a heat pump compressor, which includes a housing, an end cover, and the oil-gas separation structure described in any of the above embodiments. The housing has a suction chamber, and the end cover has a high-pressure chamber communicating with the suction chamber. The oil-gas separation structure can separate the oil-gas mixture in the high-pressure chamber and allow the separated refrigerant oil to flow back to the suction chamber. This significantly reduces the possibility of refrigerant oil being discharged from the heat pump compressor. The refrigerant oil forms a circulation loop within the heat pump compressor, thereby improving the utilization rate of the refrigerant oil. Furthermore, it solves the problem of excessive pressure drop of the gaseous refrigerant discharged from the compressor, which affects system performance.

[0014] The oil-gas separation structure and heat pump compressor provided in this application have two variations in the oil-gas separation channel along the length of the oil-gas separation pipe. The first variation is that the cross-sectional area of ​​the oil-gas separation channel changes periodically and gradually along the length of the oil-gas separation pipe. The second variation is that the flow direction of the oil-gas separation channel changes periodically and gradually along the length of the oil-gas separation pipe.

[0015] In the first scenario, when the oil-gas mixture enters the oil-gas separation channel from its smaller cross-sectional area to its larger cross-sectional area, the pressure energy of the mixture causes it to rapidly diffuse outwards and impact the surface or inner wall of the oil separator. The refrigerant adheres to the surface or inner wall of the oil separator and accumulates into droplets, while the gaseous refrigerant continues along the oil-gas separation channel and exits the separation structure. Therefore, the cross-sectional area of ​​the oil-gas separation channel changes periodically along the length of the oil-gas separation tube, causing the oil-gas mixture to continuously repeat the above process along the length of the oil separator, thereby enhancing the oil-gas separation effect. Furthermore, the gradual change in the cross-sectional area of ​​the oil-gas separation channel along the length of the oil-gas separation tube reduces the energy loss of the gaseous refrigerant due to impacts with the inner wall of the oil separator or inner cavity, thus preventing excessive pressure drop of the separated gaseous refrigerant.

[0016] In the second scenario, because the density of refrigeration oil is greater than that of gaseous refrigerant, when the direction of the airflow changes, the gaseous refrigerant is deflected, while the refrigeration oil continues to move forward under inertia, adhering to the surface of the oil separator and further accumulating into oil droplets. Therefore, by setting the flow direction of the oil-gas separation channel to change periodically along the length of the oil-gas separation pipe, the oil separator continuously separates the oil-gas mixture along the length of the oil-gas separation channel, thereby enhancing the oil-gas separation effect of the oil-gas separation structure. Furthermore, the flow direction of the oil-gas separation channel changes gradually along the length of the oil-gas separation pipe. This reduces the energy loss of the gaseous refrigerant due to impacts with the inner wall of the oil separator or the inner cavity, thus avoiding excessive pressure drop of the separated gaseous refrigerant. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A cross-sectional view of a heat pump compressor according to an embodiment of this application;

[0019] Figure 2 A cross-sectional view of an oil-gas separation structure according to an embodiment provided in this application;

[0020] Figure 3 A schematic diagram of the structure of an oil-gas separator according to an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the structure of an oil-gas separator according to another embodiment of this application;

[0022] Figure 5 A schematic diagram of the structure of an oil-gas separator according to yet another embodiment of this application;

[0023] Figure 6 This is a schematic diagram of the oil-gas separation structure according to another embodiment of this application;

[0024] Figure 7 A schematic diagram of an oil-gas separation structure according to another embodiment provided in this application;

[0025] Figure 8 A schematic diagram of the structure of a first oil-gas separator pipe according to an embodiment provided in this application.

[0026] Reference numerals: 1. Oil-gas separator pipe; 11. Inner cavity; 2. Oil separator; 21. Spiral groove; 22. Main body; 23. Spiral protrusion; 24. Intermediate channel; 3. Oil-gas separation channel; 31. First separation channel; 32. Second separation channel; 4. First oil-gas separator pipe; 41. Notch; 42. Air inlet; 5. Second oil-gas separator pipe; 51. Air outlet section; 52. Oil return section; 521. Oil outlet; 53. Assembly hole; 6. Adapter sleeve; 61. Support plane; 7. Shell; 71. Intake chamber; 8. End cap; 81. High pressure chamber; 9. Pressure relief valve. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Unless otherwise defined, all technical and scientific terms used in 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 this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0032] In the field of heat pump compressor technology, the lubrication of components plays a crucial role in the performance and service life of heat pump compressors during operation. On the one hand, refrigerant oil serves to conduct heat, reduce friction, decrease wear, and reduce noise. On the other hand, refrigerant oil forms an oil film at the interface between different chambers of the heat pump compressor, which can isolate the gas in different pressure chambers, thus providing a radial seal. The refrigerant oil in a heat pump compressor mainly exists in the form of liquid oil mist, mixing with refrigerant gas to form an oil-gas mixture. During the discharge process of the heat pump compressor, this oil-gas mixture is discharged through the exhaust port. This can lead to insufficient refrigerant oil in the compressor, resulting in greater frictional losses in the friction pairs and poor sealing between the moving and stationary discs. To reduce the amount of refrigerant oil discharged from the heat pump compressor, the end cover of the compressor typically has an oil-gas separation structure to separate the oil-gas mixture. This oil-gas separation structure includes an oil separator to enhance the oil-gas separation effect; however, the oil separator can easily lead to excessive pressure drop of the separated gaseous refrigerant.

[0033] Please see Figures 1-2 To address the problem of excessive pressure drop in the separated gaseous refrigerant that often results from oil-gas separation structures, this application provides an oil-gas separation structure. Specifically, the oil-gas separation structure includes an oil-gas separation pipe 1 and an oil separator 2. The oil-gas separation pipe 1 has an inner cavity 11, and the oil separator 2 is disposed within the inner cavity 11. Furthermore, the oil separator 2 and the inner wall of the inner cavity 11 enclose an oil-gas separation channel 3. The cross-sectional area of ​​the oil-gas separation channel 3 changes periodically and gradually along the length of the oil-gas separation pipe 1; or, the flow direction of the oil-gas separation channel 3 changes periodically and gradually along the length of the oil-gas separation pipe 1.

[0034] In other words, the variation of the oil-gas separation channel 3 along the length of the oil-gas separation pipe 1 can be divided into two cases. The first case is that the cross-sectional area of ​​the oil-gas separation channel 3 changes periodically and gradually along the length of the oil-gas separation pipe 1. The second case is that the flow direction of the oil-gas separation channel 3 changes periodically and gradually along the length of the oil-gas separation pipe 1.

[0035] In the first scenario, when the oil-gas mixture enters the oil-gas separation channel 3 from its smaller cross-sectional area to its larger cross-sectional area, the pressure energy of the mixture itself causes it to rapidly diffuse outwards and impact the surface of the oil separator 2 or the inner wall of the inner cavity 11. The refrigerant adheres to the surface of the oil separator 2 or the inner wall of the inner cavity 11 and accumulates into oil droplets, while the gaseous refrigerant continues to advance along the oil-gas separation channel 3 and is discharged from the oil-gas separation structure. Therefore, the cross-sectional area of ​​the oil-gas separation channel 3 changes periodically along the length of the oil-gas separation pipe 1, causing the oil-gas mixture to continuously repeat the above process along the length of the oil separator 2, thereby enhancing the oil-gas separation effect of the structure. Furthermore, the gradual change in the cross-sectional area of ​​the oil-gas separation channel 3 along the length of the oil-gas separation pipe 1 reduces the energy loss of the gaseous refrigerant due to impacts with the inner wall of the oil separator 2 or the inner cavity 11, thus preventing excessive pressure drop of the separated gaseous refrigerant.

[0036] In the second scenario, since the density of refrigeration oil is greater than that of gaseous refrigerant, when the direction of the airflow changes, the gaseous refrigerant is deflected, while the refrigeration oil continues to move forward under inertia, adhering to the surface of the oil separator 2 and further accumulating into oil droplets. Therefore, by setting the flow direction of the oil-gas separation channel 3 to change periodically along the length of the oil-gas separation pipe 1, the oil separator 2 continuously separates the oil-gas mixture along the length of the oil-gas separation channel 3, thereby enhancing the oil-gas separation effect of the oil-gas separation structure. Furthermore, the flow direction of the oil-gas separation channel 3 changes gradually along the length of the oil-gas separation pipe 1. This reduces the energy loss of the gaseous refrigerant due to impacts with the inner wall of the oil separator 2 or the inner cavity 11, thus preventing excessive pressure drop of the separated gaseous refrigerant.

[0037] In one embodiment, the cross-sectional area S1 of the oil-gas separation channel 3 and the cross-sectional area S2 of the inner cavity 11 satisfy 0.2S2≤S1≤0.9S2.

[0038] This enhances the oil-gas separation effect of oil separator 2 and further prevents excessive energy loss of gaseous refrigerant.

[0039] In one embodiment, such as Figure 2 and Figure 3As shown, the oil separator 2 is plate-shaped and extends in a wavy shape along the length of the oil-gas separation pipe 1. The oil separator 2 divides the inner cavity 11 into a first separation channel 31 and a second separation channel 32. Along the length of the oil-gas separation pipe 1, the cross-sectional area of ​​the first separation channel 31 and the cross-sectional area of ​​the second separation channel 32 both change in a wavy manner. At any cross-sectional position of the oil-gas separation pipe 1, the sum of the cross-sectional areas of the first separation channel 31 and the second separation channel 32 is less than or equal to the cross-sectional area of ​​the entire oil-gas separation channel 3.

[0040] It should be noted that "the oil separator 2 extends in a wavy shape along the length of the oil-gas separation pipe 1" means that the oil separator 2 extends along the length of the oil-gas separation pipe 1 as a whole, and the oil separator 2 bends back and forth in a wavy shape along the radial direction of the oil-gas separation pipe 1 so that the cross-sectional area of ​​the first separation channel 31 and the cross-sectional area of ​​the second separation channel 32 change periodically and gradually along the length of the oil-gas separation pipe 1.

[0041] By dividing the inner cavity 11 into a first separation channel 31 and a second separation channel 32, the oil-gas mixture can undergo oil-gas separation simultaneously in the first separation channel 31 and the second separation channel 32, thereby improving the oil-gas separation efficiency of the oil-gas separation structure. Furthermore, the plate-shaped oil separator 2 is easy to manufacture.

[0042] Furthermore, in one embodiment, as Figure 2 As shown, the oil separator 2 is press-fitted with the inner wall of the inner cavity 11 at the bend along its own thickness direction, and forms a through hole with the inner wall of the inner cavity 11.

[0043] This reduces the assembly difficulty of the oil separator 2 and the oil-gas separation pipe 1, and prevents the oil separator 2 from becoming loose inside the oil-gas separation pipe 1. By setting through holes, the first separation channel 31 or the second separation channel 32 can remain connected along the length of the oil-gas separation pipe 1, thereby preventing the gaseous refrigerant from hitting the surface of the oil separator 2 and being unable to continue forward, thus avoiding excessive energy loss of the gaseous refrigerant and resulting in excessive pressure drop.

[0044] However, this is not the only option. In other embodiments, the oil separator 2 may be press-fitted with the inner wall of the inner cavity 11 along its width direction.

[0045] Furthermore, in one embodiment, when the cross-sectional area of ​​the first separation channel 31 or the cross-sectional area of ​​the second separation channel 32 completes one cycle change, the extension length of the oil separator 2 is defined as one section, and the number of sections a of the oil separator 2 satisfies 1≤a≤8.

[0046] This enhances the oil-gas separation effect of oil separator 2 and prevents excessive energy loss from gaseous refrigerant.

[0047] In one embodiment, such as Figure 4 As shown, the oil separator 2 is columnar, and the periphery of the oil separator 2 is provided with a spiral groove 21 extending along the length direction of the oil-gas separation pipe 1. The spiral groove 21 and the inner wall of the inner cavity 11 cooperate to form an oil-gas separation channel 3.

[0048] Because the density of refrigeration oil is greater than that of gaseous refrigerant, when the oil-gas mixture rotates along the spiral groove 21, the centrifugal force on the refrigeration oil is greater than that on the gaseous refrigerant. Under the action of centrifugal force, the refrigeration oil separates from the gaseous refrigerant and adheres to the inner wall of the inner cavity 11, eventually accumulating into oil droplets. The spiral groove 21 has a good separation effect on the oil-gas mixture and produces a small pressure drop on the gaseous refrigerant.

[0049] Furthermore, in one embodiment, as Figure 4 As shown, the oil separator 2 includes a main body 22 and a spiral protrusion 23, with the spiral protrusion 23 forming a spiral groove 21 around the periphery of the main body 22.

[0050] This reduces the machining difficulty of the spiral groove 21. Specifically, the main body 22 and the spiral protrusion 23 are integrally formed structures, and the spiral groove 21 can be formed by turning the main body 22.

[0051] Furthermore, in one embodiment, the spiral protrusion 23 is tightly fitted to the inner wall of the inner cavity 11 on the side opposite to the main body 22.

[0052] This prevents the oil separator 2 from becoming loose inside the cavity 11.

[0053] In one embodiment, the cross-section of the spiral groove 21 is square.

[0054] This further reduces the machining difficulty of the spiral groove 21.

[0055] In another embodiment, the cross-section of the spiral groove 21 is tapered, and the cross-sectional area of ​​the spiral groove 21 gradually increases from the direction close to the main body 22 to the direction far away from the main body 22.

[0056] Thus, when the oil-gas mixture spirals forward along the spiral groove 21, the angle between the airflow direction and the side wall of the spiral groove 21 is reduced, thereby reducing the impact of the gaseous refrigerant on the side wall of the spiral groove 21, and further reducing the energy loss of the gaseous refrigerant.

[0057] In one embodiment, the length of the spiral groove 21 extending one revolution radially along the inner cavity 11 is defined as a segment, and the number of segments b of the oil separator 2 satisfies 1≤b≤8.

[0058] In this way, the oil-gas separation effect of the oil separator 2 can be enhanced, and excessive energy loss of the gaseous refrigerant can be avoided.

[0059] In one embodiment, as Figure 5 shown, the oil separator 2 is plate-shaped, and the oil separator 2 extends spirally along the length direction of the oil-gas separation pipe 1, and one end of the oil separator 2 is recessed to form a spiral groove 21.

[0060] In this way, the structure of the oil separator 2 is simplified.

[0061] Furthermore, in one embodiment, as Figure 5 shown, one end of the oil separator 2 provided with the spiral groove 21 is in interference fit with the inner wall of the inner cavity 11, and one end of the oil separator 2背离螺旋槽21的一端绕设形成中间通道24,在油气分离管1的任一横截面的位置,螺旋槽21的横截面积和中间通道24的横截面积之和等于整个油气分离通道3的横截面积。

[0062] In this way, the oil-gas mixture can simultaneously perform oil-gas separation in the spiral groove 21 and the intermediate channel 24, thereby improving the oil-gas separation efficiency of the oil-gas separation structure.

[0063] In one embodiment, the oil separator 2 is made of a metal material or rubber.

[0064] In one embodiment, as Figure 6 shown, the oil-gas separation pipe 1 includes a first oil-gas separation pipe 4 and a second oil-gas separation pipe 5. The second oil-gas separation pipe 5 is arranged along the vertical direction, and the first oil-gas separation pipe 4 is connected to a preset height position of the second oil-gas separation pipe 5. The part of the second oil-gas separation pipe 5 higher than the preset height position is defined as the gas outlet section 51, and the part of the second oil-gas separation pipe 5 lower than the preset height position is defined as the oil return section 52. The axial direction of the first oil-gas separation pipe 4 and the axial direction of the gas outlet section 51 are arranged at an angle, and the included angle A between the gas outlet direction of the first oil-gas separation pipe 4 and the gas outlet direction of the gas outlet section 51 satisfies 90° < A < 180°.

[0065] It should be noted that "the second oil-gas separation pipe 5 is arranged along the vertical direction" includes two cases: the second oil-gas separation pipe 5 is arranged along the vertical direction and the included angle between the axis direction of the second oil-gas pipe and the vertical direction.

[0066] Furthermore, by setting the included angle A between the gas outlet direction of the first oil-gas separation pipe 4 and the gas outlet direction of the gas outlet section 51 to satisfy 90° < A < 180°, the interference effect of the inner wall of the second oil-gas separation pipe 5 on the oil-gas mixture when the oil-gas mixture enters the second oil-gas separation pipe 5 from the first oil-gas separation pipe 4 is enhanced, thereby further improving the oil-gas separation effect of the oil-gas separation structure.

[0067] Furthermore, in one embodiment, 120°≤A≤150°.

[0068] This design reduces the assembly difficulty of the first oil-gas separator 4 and the second oil-gas separator 5, or reduces the processing difficulty of the first oil-gas separator 4 and the second oil-gas separator 5.

[0069] In one embodiment, such as Figure 7 As shown, the second oil-gas separator 5 is provided with an assembly hole 53. The first oil-gas separator 4 is inserted into the assembly hole 53 and is sealed to the hole wall of the assembly hole 53 so that the first oil-gas separator 4 is connected to the second oil-gas separator 5.

[0070] This further reduces the assembly difficulty of the first oil-gas separator 4 and the second oil-gas separator 5.

[0071] Furthermore, in one embodiment, as Figure 8 As shown, the first oil-gas separator 4 is inserted into the assembly hole 53 at one end and has a notch 41. The notch 41 connects the first oil-gas separator 4 and the second oil-gas separator 5.

[0072] By providing a notch 41, the oil-gas mixture in the first oil-gas separator 4 can enter the second oil-gas separator 5 through the notch 41.

[0073] Specifically, the first oil-gas separator 4 is inserted into one end of the assembly hole 53 and a notch 41 is machined by turning.

[0074] In one embodiment, such as Figure 7 As shown, the oil-gas separation structure also includes an adapter sleeve 6. One end of the adapter sleeve 6 is connected to the second oil-gas separation pipe 5 and communicates with the assembly hole 53, while the other end extends in a direction away from the assembly hole 53. The adapter sleeve 6 is fitted on the outside of the first oil-gas separation pipe 4 near the end of the second oil-gas separation pipe 5.

[0075] By setting the adapter sleeve 6, the assembly difficulty of the first oil-gas separator 4 and the second oil-gas separator 5 is further reduced, and the sealing performance of the connection between the first oil-gas separator 4 and the second oil-gas separator 5 is enhanced.

[0076] Specifically, one end of the adapter sleeve 6 is welded to the outer wall of the second oil-gas separator 5, and the inner wall of the other end is welded to the outer wall of the first oil-gas separator 4 near the end of the second oil-gas separator 5.

[0077] Furthermore, in one embodiment, as Figure 7 As shown, the adapter sleeve 6 is provided with a support plane 61, which stops at one end of the first oil-gas separator 4 inserted into the assembly hole 53.

[0078] This design prevents the first oil-gas separator pipe 4 from loosening along its own axis, thereby enhancing the firmness of the connection between the adapter sleeve 6 and the first oil-gas separator pipe 4.

[0079] However, this is not the only embodiment. In other embodiments, the first oil-gas separation pipe 4 and the second oil-gas separation pipe 5 may also be integrally formed.

[0080] Specifically, the first oil-gas separator 4 and the second oil-gas separator 5 are manufactured by casting.

[0081] This application also provides a heat pump compressor, such as Figure 1 As shown, the heat pump compressor includes a housing 7, an end cover 8, and an oil-gas separation structure as described in any of the above embodiments. The housing 7 is provided with a suction chamber 71, and the end cover 8 is provided with a high-pressure chamber 81 that communicates with the suction chamber 71. The oil-gas separation structure can separate the oil-gas mixture in the high-pressure chamber 81 and allow the separated refrigerant oil to flow back to the suction chamber 71.

[0082] Furthermore, in one embodiment, the first oil-gas separator 4, the second oil-gas separator 5, and the end cap 8 are integrally formed.

[0083] However, this is not the only option. In other embodiments, the second oil-gas separator 5 and the end cap 8 can be integrally formed. The first oil-gas separator 4 is inserted into the mounting hole 53 of the second oil-gas separator 5 to connect the second oil-gas separator 5.

[0084] This design greatly reduces the possibility of refrigerant oil being discharged from the heat pump compressor, and allows the refrigerant oil to form a circulation loop within the heat pump compressor, thereby improving the utilization rate of the refrigerant oil.

[0085] Specifically, in one embodiment, such as Figure 6 As shown, the first oil-gas separator 4 is provided with an air inlet 42 that connects to the high-pressure chamber 81, and the oil return section 52 of the second oil-gas separator 5 is provided with an oil outlet 521 that connects to the suction chamber 71.

[0086] This allows the oil-gas mixture in the high-pressure chamber 81 to enter the first oil-gas separator 4 through the air inlet 42, and allows the refrigeration oil in the oil return section 52 to flow into the suction chamber 71 through the oil outlet 521.

[0087] However, this is not the only embodiment. In other embodiments, the second oil-gas separator 5 may also be provided with an air inlet 42 that connects to the high-pressure chamber 81.

[0088] In one embodiment, such as Figure 6 As shown, the heat pump compressor also includes a pressure relief valve 9, which is located at the end of the first oil-gas separator 4 away from the assembly hole 53.

[0089] When the pressure inside the heat pump compressor housing 7 is too high, the pressure relief valve 9 is opened to bring the pressure inside the heat pump compressor housing 7 within a safe pressure range, thereby improving the safety of the heat pump compressor. Furthermore, the pressure relief valve 9 is located at the end of the first oil-gas separator pipe 4 away from the assembly hole 53, thus simplifying the structure of the end cover 8.

[0090] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An oil-gas separation structure, characterized in that, The system includes an oil-gas separation pipe (1) and an oil separator (2). The oil-gas separation pipe (1) has an inner cavity (11), and the oil separator (2) is located in the inner cavity (11). The oil separator (2) and the inner wall of the inner cavity (11) form an oil-gas separation channel (3). The cross-sectional area of ​​the oil-gas separation channel (3) changes periodically and gradually along the length of the oil-gas separation pipe (1). The oil separator (2) is plate-shaped and extends in a wavy shape along the length of the oil-gas separation pipe (1). The oil separator (2) is press-fitted with the inner wall of the inner cavity (11) at the bend along its own thickness direction. The oil separator (2) divides the inner cavity (11) into a first separation channel (31) and a second separation channel (32). Along the length of the oil-gas separation pipe (1), the cross-sectional area of ​​the first separation channel (31) and the cross-sectional area of ​​the second separation channel (32) are both wavy. At any cross-sectional position of the oil-gas separation pipe (1), the sum of the cross-sectional areas of the first separation channel (31) and the second separation channel (32) is less than the cross-sectional area of ​​the entire oil-gas separation channel (3). The oil-gas separator (1) includes a first oil-gas separator (4) and a second oil-gas separator (5). The second oil-gas separator (5) is arranged in a vertical direction. The first oil-gas separator (4) is connected to a preset height position of the second oil-gas separator (5). The part of the second oil-gas separator (5) above the preset height position is defined as the gas outlet section (51), and the part of the second oil-gas separator (5) below the preset height position is defined as the oil return section (52). The first oil-gas separator (4) is provided with an air inlet (42) connected to the high-pressure chamber (81). The oil return section (52) is provided with an oil outlet (521) connected to the suction chamber (71). The angle between the gas outlet direction of the first oil-gas separator (4) and the gas outlet direction of the gas outlet section (51) is A, 120°≤A≤150°.

2. The oil-gas separation structure according to claim 1, characterized in that, When the cross-sectional area of ​​the first separation channel (31) or the cross-sectional area of ​​the second separation channel (32) completes a periodic change, the extension length of the oil separator (2) is one section, and the number of sections a of the oil separator (2) satisfies 1≤a≤8.

3. A heat pump compressor, characterized in that, The device includes a housing (7), an end cap (8), and an oil-gas separation structure as described in any one of claims 1 to 2. The housing (7) is provided with an air intake chamber (71), and the end cap (8) is provided with a high-pressure chamber (81) that communicates with the air intake chamber (71). The oil-gas separation structure is capable of separating the oil-gas mixture in the high-pressure chamber (81) and allowing the separated refrigeration oil to flow back to the air intake chamber (71).

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