Oil separator and air conditioning system

Abstract

The present invention relates to an oil separator (100) and an air conditioning system. The oil separator (100) includes a cylindrical body (10), a return oil pipe (20), and a filter (30). One end of the cylindrical body (10) is provided with a mounting hole (11), one end of the return oil pipe (20) is inserted into the mounting hole (11) and connected to the cylindrical body (10) by the mounting hole (11), and one end of the filter (30) is attached to the connection point between the return oil pipe (20) and the cylindrical body (10). At least a portion of the filter (30) is located inside the return oil pipe (20), and the filter (30) protrudes along the axial direction of the cylindrical body (10) toward the direction away from the cylindrical body (10) to form a filtration groove (31), and the opening of the filtration groove (31) faces toward the direction closer to the cylindrical body (10).

Description

Technical Field

[0001] (Related Application) This application claims the priority of a Chinese patent application with an application number of 202321608408.8 and a title of "Oil Separator and Air Conditioning System", which was filed on June 21, 2023, and the full text of which is incorporated herein by reference.

[0002] This application relates to the technical field of oil separation, and particularly to an oil separator and an air conditioning system.

Background Art

[0003] An air conditioning compressor requires lubrication with lubricating oil during operation. However, when the compressor discharges the refrigerant, the lubricating oil is discharged together with the refrigerant. The presence of the lubricating oil, on the one hand, increases the thermal resistance of the pipeline of the air conditioning system and reduces the heat transfer effect, thereby reducing the cooling or heating efficiency of the air conditioning system. On the other hand, if the lubricating oil does not return to the compressor at an appropriate timing, it will shorten the service life of the compressor.

[0004] An oil separator is used to separate the lubricating oil and the refrigerant and return the separated lubricating oil to the compressor through a return oil pipe. Also, in order to prevent impurities from entering the compressor through the return oil pipe and damaging the compressor, generally, a filter is provided at the inlet of the return oil pipe. However, the conventional filter is prone to deformation or damage during long-term use, and the filtration area of the filter decreases, thereby affecting the filtration effect of the filter.

Summary of the Invention

[0005] Based on this, it is necessary to provide an oil separator and an air conditioning system.

[0006] This application provides an oil separator comprising a cylindrical body, a return oil pipe, and a filter, wherein one end of the cylindrical body is provided with a mounting hole, one end of the return oil pipe is inserted into the mounting hole and connected to the cylindrical body by the mounting hole, one end of the filter is attached to the connection point between the return oil pipe and the cylindrical body, at least a portion of the filter is located inside the return oil pipe, and the filter protrudes along the axial direction of the cylindrical body toward the cylindrical body to form a filtration groove, the opening of the filtration groove facing toward the cylindrical body.

[0007] In one embodiment, the oil separator further includes a fixed base, the fixed base being connected to one end of a return oil pipe inserted into a cylindrical body, and the filter being connected to the fixed base and attached to the return oil pipe by the fixed base.

[0008] In one embodiment, the fixed seat includes a first sleeve and a second sleeve, the first sleeve being provided on the outer circumference of the second sleeve, one end of which is close to the opening of the filtration groove in the filter being interposed between the first sleeve and the second sleeve, and the first sleeve and the second sleeve being interference-fitted.

[0009] In one embodiment, along the axial direction of the cylindrical body, one end away from the opening of the filtration groove in the first sleeve is bent toward the axis of the cylindrical body and secured to the outside of the filter.

[0010] In one embodiment, the oil separator further includes a fixed base, the fixed base being connected to one end of a return oil pipe inserted into a cylindrical body, and the other end, which is close to the opening of the filtration groove in the filter, being interposed between the fixed base and the return oil pipe.

[0011] In one embodiment, the filter includes a main body and a connecting portion connected to each other, the main body being provided inside the oil return pipe, and one end of the main body near the opening of the filtration groove being folded outward to form a connecting portion, the connecting portion being located outside the oil return pipe and sandwiched between the outer wall of the oil return pipe and the inner wall of the mounting hole.

[0012] In one embodiment, a first step is provided on the inner wall of the oil return pipe, and the fixed seat is in direct or indirect contact with the first step, and / or the end face of the fixed seat that is close to the inside of the cylindrical body and the end face of the oil return pipe that is close to the inside of the cylindrical body are provided flush.

[0013] In one embodiment, the inner diameter of the filter gradually decreases along the axial direction of the cylindrical body and along the direction from the cylindrical body to the oil return pipe.

[0014] In one embodiment, an intake pipe and an exhaust pipe are connected to one end of the cylindrical body away from the oil return pipe, and the oil separator further includes connecting members, each of which is connected to one end of the intake pipe away from the cylindrical body, one end of the exhaust pipe away from the cylindrical body, and one end of the oil return pipe away from the cylindrical body, the connecting members being made of copper, and the cylindrical body, oil return pipe, intake pipe, exhaust pipe, and filter being made of stainless steel.

[0015] This application further provides an air conditioning system including an oil separator as described in any one of the embodiments described above.

[0016] Details of one or more embodiments of this application are presented in the following drawings and description. Other features, purposes, and advantages of this application will become apparent from the specification, drawings, and claims. [Brief explanation of the drawing]

[0017] Examples and / or illustrations that better illustrate these inventions disclosed herein can be referenced to one or more drawings. Any additional details or illustrations used to illustrate the drawings should not be considered to limit the scope of the disclosed inventions, the examples and / or illustrations described herein, or the best embodiments of these inventions as understood herein.

[0018] [Figure 1] This is a schematic diagram of the structure of an oil separator according to one embodiment of this application. [Figure 2]This is a schematic diagram of the structure of an oil separator according to one embodiment of this application. [Figure 3] This is a magnified view of area A in Figure 2. [Figure 4] This is a schematic diagram of the structure of an oil separator according to one embodiment of this application. [Figure 5] This is a magnified view of area B in Figure 4. [Figure 6] This is a schematic diagram of the structure of an oil separator according to one embodiment of this application. [Figure 7] This is a magnified view of area C in Figure 6.

[0019] In the drawings, the meaning of each symbol is as follows: 100 Oil separator, 10 Cylindrical body, 11 Mounting hole, 111 Second step, 20 Return oil pipe, 21 First step, 30 Filter, 31 Filtration groove, 32 Main body, 33 Connection part, 40 Fixing base, 41 First sleeve, 42 Second sleeve, 43 Restricting part, 50 Intake pipe, 60 Exhaust pipe, 70 Connecting member. [Modes for carrying out the invention]

[0020] To better understand the above-mentioned objectives, features, and advantages of this application, specific embodiments of this application are described below in detail with reference to the drawings. In the following description, many specific details are provided to facilitate a complete understanding of this application. However, this application can be implemented in many other forms different from those described herein, and those skilled in the art can make similar improvements as long as they do not contradict the content of this application, so this application is not limited by the specific embodiments disclosed below.

[0021] In addition, when an assembly is "fixed to" or "provided on" another assembly, it may be provided directly on the other assembly, or there may be intervening assemblies. When an assembly is considered to be "connected to" another assembly, it may be directly connected to the other assembly, or intervening assemblies may be present at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" used in the specification of this application, as well as similar expressions, are for illustrative purposes only and do not represent the only embodiment.

[0022] Furthermore, the terms "first", "second" are for illustrative purposes only and should not be understood as indicating or implying relative importance or implicitly designating the number of the indicated technical features. Thus, the features limited by "first", "second" can explicitly or implicitly include at least one of these features. In the description of this application, "a plurality" means at least two, for example, two, three, etc., unless there is a clear and specific limitation.

[0023] In this application, unless there are particularly clear regulations and limitations, the fact that the first feature is "above", "below" the second feature may mean that the first feature and the second feature are in direct contact, or that the first feature and the second feature are in indirect contact through an intermediate medium. And the fact that the first feature is "above", "upward", and "upper side" of the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply that the horizontal height of the first feature is higher than that of the second feature. The fact that the first feature is "below", "downward", and "lower side" of the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply that the horizontal height of the first feature is lower than that of the second feature.

[0024] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as that commonly understood by those skilled in the art. Terms used in the specification of this application are intended solely to describe specific embodiments and are not intended to limit this application. The terms “and / or” used in the specification of this application include any and all combinations of the relevant enumerated items.

[0025] Air conditioning compressors require lubrication with lubricating oil during operation, but when the compressor discharges refrigerant, the lubricating oil is discharged along with the refrigerant. On the one hand, the presence of lubricating oil increases the thermal resistance of the air conditioning system's pipelines, reducing the heat transfer effect and thus decreasing the cooling or heating efficiency of the air conditioning system. On the other hand, if the lubricating oil does not return to the compressor at the appropriate time, it shortens the compressor's service life.

[0026] An oil separator is used to separate lubricating oil from refrigerant and return the separated lubricating oil to the compressor via a return pipe. Generally, a filter is installed at the inlet of the return pipe to prevent impurities from entering the compressor and damaging it. However, conventional filters are prone to deformation or damage after prolonged use, reducing their filtration area and thus affecting their filtration effectiveness.

[0027] Referring to Figure 1, in order to solve the problem that conventional filters are prone to deformation or damage, this application provides an oil separator 100, which is connected to the outlet of a compressor and used to separate lubricating oil from refrigerant and return the lubricating oil to the compressor.

[0028] Referring to Figures 2 to 7, the oil separator 100 includes a cylindrical body 10, a return oil pipe 20, and a filter 30. One end of the cylindrical body 10 is provided with a mounting hole 11, and one end of the return oil pipe 20 is inserted into the mounting hole 11 and connected to the cylindrical body 10 by the mounting hole 11. One end of the filter 30 is attached to the connection point between the return oil pipe 20 and the cylindrical body 10. At least a portion of the filter 30 is located inside the return oil pipe 20, and the filter 30 protrudes along the axial direction of the cylindrical body 10 toward the cylindrical body 10 to form a filtration groove 31, with the opening of the filtration groove 31 facing toward the cylindrical body 10.

[0029] This application provides a filter 30 that filters out impurities from the lubricating oil, preventing them from entering the compressor via the return oil pipe 20 and reducing the compressor's service life. In this application, the opening of the filter groove 31 faces in a direction that is close to the cylindrical body 10. In other words, in this application, the lubricating oil first passes through the opening of the filter groove 31 and enters the filter groove 31. Due to the structure of the filter 30, the filter 30 is less likely to deform under the pressure of the lubricating oil, preventing the filter 30 from being compressed by the lubricating oil and easily deforming by becoming concave in the filter groove 31. This effectively secures the filtration area of ​​the filter 30 and improves the filtration effect of the filter 30.

[0030] Specifically, a second step 111 is provided on the inner wall of the mounting hole 11, and the second step 111 is located at one end of the oil return pipe 20 that is close to the cylindrical body 10, facilitating the insertion and positioning of the oil return pipe 20, which is advantageous for subsequent welding of the oil return pipe 20 and the cylindrical body 10, and improving the installation efficiency of the oil return pipe 20.

[0031] Furthermore, in one embodiment, an intake pipe 50 and an exhaust pipe 60 are connected to one end of the cylindrical body 10 away from the return oil pipe 20. The intake pipe 50 is connected to the outlet of the compressor, and the mixed refrigerant enters the inside of the cylindrical body 10 through the intake pipe 50, where oil-liquid separation takes place. The separated lubricating oil returns to the compressor through the return oil pipe 20, and the refrigerant flows out through the exhaust pipe 60, after which heat exchange takes place.

[0032] The oil separator 100 further includes connecting members 70, each of which is connected to one end of the intake pipe 50 away from the cylindrical body 10, one end of the exhaust pipe 60 away from the cylindrical body 10, and one end of the return oil pipe 20 away from the cylindrical body 10. The connecting members 70 are made of copper, while the cylindrical body 10, return oil pipe 20, intake pipe 50, exhaust pipe 60, and filter 30 are all made of stainless steel.

[0033] Since stainless steel is relatively inexpensive, if most of the components of the oil separator 100 are made of stainless steel, the production cost of the oil separator 100 can be reduced. Also, many of the connecting pipes in the air conditioning system are made of copper, and because there is a large difference in welding properties between copper and stainless steel, welding the oil separator 100 to the connecting pipes in the air conditioning system is difficult. Therefore, by providing a copper connecting member 70, the oil separator 100 is welded to the connecting pipes in the air conditioning system by the connecting member 70, which is advantageous in reducing the difficulty of welding, and thereby improves the installation efficiency of the oil separator 100.

[0034] In one embodiment, the inner diameter of the filter 30 gradually decreases along the axial direction of the cylindrical body 10 and along the direction from the cylindrical body 10 to the oil return pipe 20.

[0035] Specifically, one end of the filter 30 away from the opening of the filtration groove 31 contracts in the axial direction of the filtration groove 31 to form a semicircle. In this way, a certain distance exists between the filter 30 and the inner wall of the return oil pipe 20, preventing the inner wall of the return oil pipe 20 from obstructing the flow of lubricating oil. This substantially increases the filtration area of ​​the filter 30 and improves the filtration effect of the filter 30.

[0036] Furthermore, the gradual decrease in the inner diameter of the filter 30 includes a mode in which the inner diameter of the filter 30 initially remains constant before decreasing.

[0037] Example 1 In this embodiment, as shown in Figures 2 and 3, the oil separator 100 further includes a fixed seat 40, which is connected to one end of a return oil pipe 20 inserted into the cylindrical body 10. The end of the filter 30 that is close to the opening of the filtration groove 31 is interposed between the fixed seat 40 and the return oil pipe 20.

[0038] In this way, the installation of the filter 30 is simplified, and the installation efficiency of the filter 30 can be improved. Furthermore, by providing a fixing seat 40, the installation and fixing of the filter 30 becomes easier, preventing the filter 30 from loosening during use and preventing impurities from entering the return oil pipe 20 and the compressor, thereby preventing damage to the compressor. In addition, since the fixing seat 40 has an annular structure, the structure of the fixing seat 40 is simplified, which reduces the manufacturing cost of the fixing seat 40 and improves manufacturing efficiency.

[0039] Furthermore, in one embodiment, the outer wall of the fixed seat 40 and the inner wall of the oil return pipe 20 are fitted together to avoid interference.

[0040] In this way, the connection strength between the fixed seat 40 and the oil return pipe 20 is strengthened, preventing the fixed seat 40 from detaching from the oil return pipe 20 during use, thereby ensuring a secure attachment of the filter 30. Furthermore, the interference fit between the fixed seat 40 and the oil return pipe 20 sandwiches the filter 30 between the fixed seat 40 and the oil return pipe 20, thereby achieving an even more secure attachment of the filter 30.

[0041] In one embodiment, as shown in Figure 3, a first step 21 is provided on the inner wall of the oil return pipe 20, and the fixing seat 40 is indirectly in contact with the first step 21.

[0042] Thus, when the fixed seat 40 enters the oil return pipe 20, the first step 21 can stop the fixed seat 40, making it easier to position the fixed seat 40 and making it easier to install. Furthermore, when the filter 30 is interposed between the fixed seat 40 and the oil return pipe 20, and the fixed seat 40 comes into contact with the first step 21, the filter 30 is present between the fixed seat 40 and the first step 21, so in this embodiment, the fixed seat 40 comes into indirect contact with the first step 21.

[0043] Specifically, the first step 21 may be formed by tapering in diameter from the return oil pipe 20 in its axial direction. In this way, the first step 21 has a simple structure and can significantly reduce the difficulty of manufacturing the return oil pipe 20.

[0044] Furthermore, in one embodiment, the end face of the fixed seat 40 that is close to the inside of the cylindrical body 10 and the end face of the return oil pipe 20 that is close to the inside of the cylindrical body 10 are provided flush with each other.

[0045] Furthermore, the end face of the fixed seat 40 that is close to the inside of the cylindrical body 10 is the end face of the fixed seat 40 that is close to the exhaust pipe 60, and the end face of the return oil pipe 20 that is close to the inside of the cylindrical body 10 is the end face of the return oil pipe 20 that is close to the exhaust pipe 60.

[0046] In this way, the fixed seat 40 avoids obstructing the oil flow, thereby improving the oil recovery rate. Furthermore, there is a large contact area between the fixed seat 40 and the return oil pipe 20, which further strengthens the connection strength between the fixed seat 40 and the return oil pipe 20.

[0047] Of course, in other embodiments, the end face of the fixed seat 40 adjacent to the exhaust pipe 60 may be higher or lower than the end face of the return oil pipe 20 adjacent to the exhaust pipe 60, and this is not excessively limited here.

[0048] Furthermore, in one embodiment, the fixed seat 40, the filter 30, and the return oil pipe 20 are made of the same material, and the fixed seat 40, the filter 30, and the return oil pipe 20 are welded together by argon arc welding or laser welding.

[0049] Specifically, the fixed seat 40 is made of stainless steel, which has higher hardness, is less prone to deformation, and is cheaper than conventional copper materials, thus significantly reducing material costs. Furthermore, since the fixed seat 40, filter 30, and return oil pipe 20 are made of the same material, when welded by argon arc welding or laser welding, the fixed seat 40, filter 30, and return oil pipe 20 can self-melt and be connected as one unit, reducing the difficulty of welding the fixed seat 40, filter 30, and return oil pipe 20, eliminating the need for welding materials, and saving on welding material costs. In addition, welding can be used to further strengthen the connection strength between the fixed seat 40, filter 30, and return oil pipe 20, improving the robustness of the attachment between the fixed seat 40 and the filter 30.

[0050] Of course, in other embodiments, even if the materials of the fixed seat 40, filter 30, and return pipe 20 are different, the connection strength can be strengthened by welding.

[0051] Example 2 The structure of this embodiment is basically the same as that of Embodiment 1, so we will omit repeated explanations of the same points, and the differences are as follows. In this embodiment, as shown in Figures 4 and 5, the filter 30 is connected to a fixed base 40 and attached to the oil return pipe 20 by the fixed base 40.

[0052] In this way, the filter 30 and the mounting base 40 can be assembled first, simplifying the installation of the filter 30 and improving the installation efficiency of the filter 30.

[0053] Furthermore, in one embodiment, the fixed seat 40 includes a first sleeve 41 and a second sleeve 42, the first sleeve 41 is provided on the outer circumference of the second sleeve 42, and the outer ring of the first sleeve 41 is fixedly connected to the inner wall of the oil return pipe 20. One end of the filter 30 that is close to the opening of the filtration groove 31 is interposed between the first sleeve 41 and the second sleeve 42, and the first sleeve 41 and the second sleeve 42 are interference fitted.

[0054] Thus, the mounting base 40 has a simple structure and can secure the filter 30 without being linked to other structures, effectively reducing the difficulty of installing the filter 30.

[0055] Specifically, the mounting base 40 further includes a limiting portion 43, each limiting portion 43 connecting one end of the first sleeve 41 to the opening of the filtration groove 31 and the other end of the second sleeve 42 to the opening of the filtration groove 31. The limiting portion 43 is secured to the filter 30, preventing the filter 30 from protruding from the end of the mounting base 40 and being damaged. The limiting portion 43 also serves a positioning function for the filter 30, further simplifying the installation of the filter 30 and reducing the difficulty of assembling the filter 30.

[0056] Furthermore, in one embodiment, one end of the fixed seat 40 adjacent to the opening of the filtration groove 31 is secured to the second step 111, and the other end of the fixed seat 40 away from the opening of the filtration groove 31 is in direct contact with the first step 21. In this way, the first step 21 and the second step 111 are secured to both ends of the fixed seat 40, thereby restricting the movement of the fixed seat 40 along its own axis, making the mounting of the fixed seat 40 more stable, and thereby ensuring the reliability of the use of the filter 30.

[0057] In this embodiment, the filter 30 is directly attached to the fixed base 40, and there is no partition between the fixed base 40 and the first step 21 by the filter 30, so the fixed base 40 can come into direct contact with the first step 21.

[0058] Of course, in other embodiments, one end of the fixed seat 40 that is close to the opening of the filtration groove 31 does not have to be stopped by the second step 111, or it may be flush with the end face of the return oil pipe 20 that is close to the exhaust pipe 60.

[0059] In one embodiment, one end of the first sleeve 41 away from the opening of the filtration groove 31 is bent toward the axis of the cylindrical body 10 and secured to the outside of the filter 30.

[0060] In this way, by partially bending the first sleeve 41, the filter 30 can be secured, preventing the filter 30 from detaching from the fixing base 40, thereby further improving the robustness of the filter 30's mounting.

[0061] Example 3 In this embodiment, as shown in Figures 6 and 7, the filter 30 includes a main body portion 32 and a connecting portion 33 that are connected to each other. The main body portion 32 is provided inside the oil return pipe 20, and one end of the main body portion 32 that is close to the opening of the filtration groove 31 is folded outward to form the connecting portion 33. The connecting portion 33 is provided on the outside of the oil return pipe 20, and the connecting portion 33 is sandwiched between the outer wall of the oil return pipe 20 and the inner wall of the mounting hole 11, so that the main body portion 32 can be attached to the connection point between the oil return pipe 20 and the cylindrical body 10 by the connecting portion 33.

[0062] Specifically, the main body 32 is folded 180° outward to form a connecting portion 33, and the connecting portion 33 is sandwiched between the outer wall of the oil return pipe 20 and the inner wall of the mounting hole 11 by interference fit between the outer wall of the oil return pipe 20 and the inner wall of the mounting hole 11, thereby enabling the installation and fixing of the filter 30. As a result, the installation of the fixing base 40 is unnecessary, costs are reduced, the installation of the filter 30 is simplified, and the installation efficiency of the filter 30 is improved.

[0063] Of course, in other embodiments, the connection portion 33 may be directly connected to the oil return pipe 20 and the cylindrical body 10 by welding between the oil return pipe 20 and the cylindrical body 10, thereby reducing the interference work process or, on the basis of the interference, further improving the installation efficiency of the filter 30.

[0064] This application further provides an air conditioning system including the oil separator 100 described in any one of the above embodiments.

[0065] The technical features of the embodiments described above can be combined in any way, and for the sake of simplicity, not all possible combinations of the technical features in the embodiments described above have been described. However, as long as these combinations of technical features are inconsistent, they should be considered to fall within the scope described herein.

[0066] The above embodiments are merely examples of some embodiments of this application, and although the descriptions are specific and detailed, they should not be understood as limiting the scope of the application. Those skilled in the art can make further modifications and improvements without departing from the spirit of this application, all of which fall within the scope of protection of this application. Therefore, the scope of protection of the patent in this application shall be in accordance with the attached claims.

Claims

1. The system includes a cylindrical body, an oil return pipe, and a filter, the cylindrical body having a mounting hole at one end, and the oil return pipe having one end inserted into the mounting hole and connected to the cylindrical body by the mounting hole. An oil separator wherein one end of the filter is attached to the connection point between the return oil pipe and the cylindrical body, at least a portion of the filter is located inside the return oil pipe, and the filter protrudes along the axial direction of the cylindrical body toward the cylindrical body, forming a filtration groove, and the opening of the filtration groove faces toward the cylindrical body.

2. The oil separator according to claim 1, further comprising a fixed seat, the fixed seat being connected to one end of the return oil pipe inserted into the cylindrical body, and the filter being connected to the fixed seat and attached to the return oil pipe by the fixed seat.

3. The oil separator according to claim 2, wherein the fixed seat includes a first sleeve and a second sleeve, the first sleeve is provided on the outer circumference of the second sleeve, one end of which is close to the opening of the filtration groove in the filter is interposed between the first sleeve and the second sleeve, and the first sleeve and the second sleeve are interference fitted.

4. The oil separator according to claim 3, wherein, along the axial direction of the cylindrical body, one end of the first sleeve away from the opening of the filtration groove is bent toward the axis of the cylindrical body and secured to the outside of the filter.

5. The oil separator according to claim 1, further comprising a fixed seat, the fixed seat being connected to one end of the return oil pipe inserted into the cylindrical body, and the other end of the fixed seat being adjacent to the opening of the filtration groove in the filter being interposed between the fixed seat and the return oil pipe.

6. The oil separator according to claim 1, wherein the filter includes a main body and a connecting portion connected to each other, the main body being provided within the return oil pipe, one end of the main body adjacent to the opening of the filtration groove being folded outward to form the connecting portion, the connecting portion being located outside the return oil pipe and sandwiched between the outer wall of the return oil pipe and the inner wall of the mounting hole.

7. A first step is provided on the inner wall of the oil return pipe, and the fixing seat is in direct or indirect contact with the first step. The oil separator according to any one of claims 2 to 5, wherein the end face of the fixed seat adjacent to the interior of the cylindrical body and the end face of the return oil pipe adjacent to the interior of the cylindrical body are provided flush with each other.

8. The oil separator according to any one of claims 1 to 6, wherein the inner diameter of the filter above gradually decreases along the axial direction of the cylindrical body and along the direction from the cylindrical body to the return oil pipe.

9. An intake pipe and an exhaust pipe are connected to one end of the cylindrical body away from the oil return pipe, and the oil separator further includes connecting members, each of which is connected to one end of the intake pipe away from the cylindrical body, one end of the exhaust pipe away from the cylindrical body, and one end of the oil return pipe away from the cylindrical body. The oil separator according to any one of claims 1 to 6, wherein the material of the connecting member is copper, and the material of the cylindrical body, the return oil pipe, the intake pipe, the exhaust pipe, and the filter are all stainless steel.

10. An air conditioning system comprising an oil separator according to any one of claims 1 to 9.

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