gas-liquid separator

Abstract

This application relates to the field of gas-liquid separation technology, and in particular to a gas-liquid separator. The gas-liquid separator includes a cylinder, an inlet pipe, and an outlet pipe. Along the height direction of the cylinder, the cylinder has a first end and a second end. The inlet pipe is located at the first end and communicates with the interior of the cylinder. The outlet pipe is located inside the cylinder and includes a first pipe section and a second pipe section that are interconnected. The first pipe section extends along the height direction of the cylinder, and an inlet is formed at the end near the first end. The second pipe section extends along the radial direction of the cylinder to form an "L" shape with the first pipe section. An oil return hole is provided on the second pipe section, communicating with the interior of the second pipe section, and located on the wall surface of the second pipe section facing the second end. This application uses a segmented "L"-shaped outlet pipe, which lowers the position of the oil return hole on the second pipe section, improving oil return efficiency and enabling earlier oil return for timely oil supply to the compressor.

Description

Technical Field

[0001] This application relates to the field of gas-liquid separation technology, and in particular to a gas-liquid separator. Background Technology

[0002] A gas-liquid separator is typically located between the evaporator and the compressor. Its functions include separating the gas and liquid, storing the separated liquid, filtering and returning the compressor lubricating oil, and preventing liquid refrigerant from flowing into the compressor and causing "liquid slugging." In existing gas-liquid separators, the outlet pipe inside the cylinder is generally designed as a "U"-shaped pipe. The U-shaped bend of the "U"-shaped pipe forms a liquid seal, requiring the gas flow to pass through the liquid for discharge. This effectively intercepts unsettled droplets, providing strong anti-entrapment capabilities. Furthermore, the oil return hole is usually located at the U-shaped bend of the "U"-shaped pipe, allowing a certain amount of lubricating oil and refrigerant to atomize and return to the compressor, preventing oil shortage.

[0003] However, at present, due to the limitation of the bending diameter of the "U" tube, the volume of the "U" tube is generally large. When the "U" tube is arranged in the cylinder, due to the near-hemispherical structure of the cylinder near the bottom, the U-shaped bend section is generally located relatively high in the cylinder. This makes the position of the oil return hole also high, resulting in low oil return efficiency and possibly failing to supply oil to the compressor in a timely manner. Utility Model Content

[0004] Therefore, it is necessary to provide a gas-liquid separator that can position the outlet pipe at a relatively low position within the cylinder near the oil return hole, thereby improving oil return efficiency and enabling timely oil supply to the compressor.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] A gas-liquid separator includes a cylinder, an inlet pipe, and an outlet pipe. In the height direction of the cylinder, the cylinder has a first end and a second end, with the first end located above the second end. The inlet pipe is located at the first end and connected to the cylinder, and communicates with the interior of the cylinder.

[0007] The air outlet pipe (30) is at least partially disposed inside the cylinder (10) and includes a first pipe section (31) and a second pipe section (32) that are connected and communicate with each other. The first pipe section (31) extends along the height direction of the cylinder (10) and forms an air inlet (311) at the end of the first pipe section (31) near the first end (11). The second pipe section (32) is located at the end of the first pipe section (31) near the second end (12) and extends along the radial direction of the cylinder (10) to form an "L" shaped structure with the first pipe section (31).

[0008] Furthermore, the second pipe section (32) is provided with an oil return hole (321), which connects the interior of the second pipe section (32) with the cylinder (10), and the oil return hole (321) is located on the wall surface of the second pipe section (32) facing the second end (12).

[0009] Understandably, this application eliminates the bending diameter limitation of existing outlet pipes by setting up a first pipe section and a second pipe section and connecting them to form an "L"-shaped outlet pipe. This allows the second pipe section of the "L"-shaped outlet pipe to be placed at a lower position near the second end of the cylinder, thereby lowering the position of the oil return hole on the second pipe section, improving oil return efficiency, and enabling earlier oil return to supply oil to the compressor in a timely manner. At the same time, the segmented "L"-shaped pipe eliminates the forced correlation between the bending radius and the outlet pipe diameter. The cylinder diameter only needs to be larger than the diameter of the first pipe section, which can achieve cylinder miniaturization. After eliminating the bending radius limitation, the outlet pipe diameter can be increased as much as possible, reducing flow resistance and pressure drop, making the gas-liquid separator more energy-efficient. It also simplifies the flow path of the outlet pipe, reduces turbulence, and has a simpler manufacturing process and lower production cost.

[0010] In one embodiment, a filter element is provided on the second pipe section, and the filter element has the oil return hole. The end of the second pipe section away from the first pipe section is used to connect to the connecting pipe.

[0011] The diameter of the oil return hole is smaller than the diameter of the connecting pipe, and the oil return hole is configured as a throttling hole.

[0012] Understandably, the filter element is designed to filter solid impurities in the gas-liquid mixture, preventing impurities from flowing to the oil return hole and causing blockage. The oil return hole is configured as a throttling orifice, which can balance the pressure at the oil return hole and prevent the compressor from drawing oil directly from the bottom of the cylinder during intake, thus preventing some liquid from entering the compressor along with the gas. In other words, by setting the throttling orifice, it is ensured that only pure gas enters the compressor, preventing liquid from entering and damaging the compressor.

[0013] In one embodiment, the filter element includes a base and a first filter screen, the second pipe section has an installation hole, one end of the base extends into the installation hole and is connected to the second pipe section, and the base has an open filter cavity.

[0014] The base has an oil return hole at one end that extends into the mounting hole. The oil return hole is connected to the filter chamber. The first filter screen is fixed to the base and covers the opening.

[0015] In one embodiment, the height of the first filter screen is set to h2; in the height direction of the cylinder, the distance between the oil return hole and the second end is set to h1, h2≤h1≤h2+(5~10)mm.

[0016] Understandably, this design avoids the return oil hole being too low, which could cause impurities at the bottom of the cylinder to enter or block the return oil hole. It also ensures that the return oil hole is high enough to allow for timely oil return, shortening the return oil path and improving return oil efficiency. At the same time, it lowers the position of the return oil hole to increase the overall effective volume of the gas-liquid separator.

[0017] In one embodiment, a tapered surface is formed on the base, and the tapered surface is welded to the second pipe segment.

[0018] In one embodiment, the inner diameter of at least a portion of the filter chamber gradually decreases from the opening to the return oil hole.

[0019] Understandably, this setup creates a flow guide surface to direct the liquid to the first filter screen, where it is filtered before entering the return oil hole.

[0020] In one embodiment, one end of the base that extends into the mounting hole protrudes from the inner wall of the second pipe section.

[0021] Understandably, this design ensures the sealing of the connection structure between the base and the second pipe section, ensuring that the liquid can enter the second pipe section through the oil return hole, and that the fluid passing through the oil return hole can smoothly enter the second pipe section, thereby improving the stability of the oil return of the gas-liquid separator.

[0022] In one embodiment, the gas-liquid separator further includes a second filter screen, which is fixed to the inner wall of the cylinder and divides the cylinder into a first cavity and a second cavity in the height direction of the cylinder, with the first cavity located above the second cavity.

[0023] The oil return hole is located in the second cavity.

[0024] Understandably, the second filter screen is designed to filter the gas-liquid mixture, and the oil return hole is located in the second chamber to ensure that the liquid passing through the oil return hole is filtered, thus preventing liquid with impurities from passing through the oil return hole and causing blockage.

[0025] In one embodiment, the diameter of the first pipe section is d, and the inner diameter of the cylinder is D, where 1 / 2D ≤ d < D.

[0026] Understandably, this setup ensures that the first pipe section has a sufficiently large diameter to reduce fluid flow resistance, lower flow pressure drop, reduce the energy consumption of the gas-liquid separator, and improve the user experience.

[0027] In one embodiment, the gas-liquid separator further includes a baffle, a sleeve, and a connecting pipe. The baffle is disposed inside the cylinder and one end of the baffle is connected to the first pipe section, while the other end is fixed to the cylinder. The sleeve is sleeved on a section of the second pipe section away from the first pipe section and passes through the cylinder. One end of the connecting pipe is connected to the sleeve, and the other end is used to connect to the compressor.

[0028] Understandably, the baffle increases the stability of the outlet pipe installation, prevents it from shaking during operation, reduces abnormal noise, and improves the structural robustness. The sleeve connects the connecting pipe to the second pipe section, ensuring the sealing of the connection between the connecting pipe and the second pipe section, preventing the gas flowing out from the oil return hole from being wasted, thus ensuring sufficient oil supply to the compressor.

[0029] Compared with existing technologies, the gas-liquid separator described above, by setting a first pipe section and a second pipe section and connecting them to form an "L"-shaped outlet pipe, eliminates the limitation of the bending diameter of existing outlet pipes. This allows the second pipe section of the "L"-shaped outlet pipe to be placed at a lower position near the second end of the cylinder, thereby lowering the position of the oil return hole on the second pipe section, improving oil return efficiency, and enabling earlier oil return to supply oil to the compressor in a timely manner. At the same time, the segmented "L"-shaped pipe eliminates the forced correlation between the bending radius and the outlet pipe diameter. The cylinder diameter only needs to be larger than the diameter of the first pipe section, which can achieve cylinder miniaturization. After eliminating the bending radius limitation, the outlet pipe diameter can be increased as much as possible, reducing flow resistance and pressure drop, making the gas-liquid separator more energy-efficient. It also simplifies the flow path of the outlet pipe, reduces turbulence, and its manufacturing process is simpler and the production cost is lower. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the gas-liquid separator provided in this application.

[0032] Figure 2 This is a cross-sectional structural diagram of the gas-liquid separator provided in this application.

[0033] Figure 3 This is a schematic diagram of the structure of the air outlet pipe and filter element provided in this application.

[0034] Figure 4 Provided for this application Figure 3 A schematic diagram of the cross-sectional structure at point AA.

[0035] Figure 5 This is a cross-sectional structural diagram near the second end provided in this application.

[0036] Figure 6 The structural diagram of the filter element provided in this application.

[0037] Figure 7 This is a partial structural diagram of the air outlet pipe near the mounting hole provided in this application.

[0038] 100. Gas-liquid separator; 10. Cylinder; 11. First end; 12. Second end; 20. Inlet pipe; 30. Outlet pipe; 31. First pipe section; 311. Inlet; 32. Second pipe section; 321. Oil return hole; 322. Filter element; 3221. Base; 3222. Opening; 3223. Filter chamber; 3224. First filter screen; 3225. Conical surface; 323. Mounting hole; 324. Inner wall; 40. Second filter screen; 41. First chamber; 42. Second chamber; 50. Baffle; 60. Sleeve; 70. Connecting pipe. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0044] Please see Figures 1 to 7 This application provides a gas-liquid separator 100, mainly used in equipment such as compressors. By improving the related structures of the outlet pipe 30 and the oil return hole 321, the forming process of the outlet pipe 30 is simplified, the manufacturing cost is reduced, and the cylinder diameter of the cylinder 10 can be made suitable for miniaturized equipment. The diameter of the outlet pipe 30 can be increased as much as possible, thereby reducing the fluid resistance in the outlet pipe 30 to adapt to small-volume, high-flow-rate systems. At the same time, the gas-liquid separator 100 can return oil in advance to supply oil to the compressor in a timely manner.

[0045] Specifically, the gas-liquid separator 100 includes a cylinder 10, an inlet pipe 20, and an outlet pipe 30. In the height direction of the cylinder 10, the cylinder 10 has a first end 11 and a second end 12, with the first end 11 located above the second end 12. The inlet pipe 20 is located at the first end 11 and connected to the cylinder 10, and communicates with the interior of the cylinder 10. The outlet pipe 30 is at least partially located inside the cylinder 10 and includes a first pipe section 31 and a second pipe section 32 that are interconnected and communicate with each other. The first pipe section 31 extends along the height direction of the cylinder 10, and the end of the first pipe section 31 near the first end 11 forms an inlet 311. The second pipe section 32 is located at the end of the first pipe section 31 near the second end 12 and extends along the radial direction of the cylinder 10 to form an "L"-shaped structure with the first pipe section 31. Furthermore, the second pipe section 32 is provided with an oil return hole 321, which communicates with the interior of the second pipe section 32.

[0046] Understandably, the outlet pipe 30 located inside the cylinder 10 in the existing gas-liquid separator 100 is generally set as a "U"-shaped pipe. The "U"-shaped pipe is generally composed of a bent pipe and two straight pipes. In order to ensure that there are no wrinkles at the bend of the "U"-shaped pipe section, its bending radius is usually large. This means that the position of the oil return hole 321 located in the "U"-shaped pipe section can only be at a relatively high position relative to the bottom of the cylinder, resulting in low oil return efficiency and inability to supply oil to the compressor in a timely manner, which will affect the compressor's operating status or reduce its service life. Moreover, due to the limitation of the bending radius of the "U"-shaped pipe section, the cylinder diameter of the cylinder 10 needs to be larger than the bending radius of the bent pipe plus the diameter of the two straight pipes to ensure that the "U"-shaped pipe is completely placed inside the cylinder 10. This results in a large cylinder diameter of the cylinder 10, and the pipe diameter of the straight pipe is usually small, the flow channel is long, and the fluid resistance is large. It is difficult to adapt to the gas-liquid separation process in small volume, large flow system. In addition, the forming process of the "U"-shaped pipe is complex and the manufacturing cost is also high. Therefore, this application, by setting a first pipe section 31 and a second pipe section 32 and connecting them to form an "L"-shaped outlet pipe 30, eliminates the bending diameter limitation of the existing outlet pipe 30. This allows the second pipe section 32 of the "L"-shaped outlet pipe 30 to be positioned at a lower position near the second end 12 of the cylinder 10, thereby lowering the position of the oil return hole 321 on the second pipe section 32, improving oil return efficiency, and enabling earlier oil return to supply oil to the compressor in a timely manner. Simultaneously, the use of a segmented "L"-shaped outlet pipe... The design eliminates the forced correlation between the bending radius and the diameter of the outlet pipe 30. The diameter of the cylinder 10 only needs to be larger than the diameter of the first pipe section 31, which enables the miniaturization of the cylinder 10 and makes it suitable for compact layout systems. This saves energy and reduces costs. Furthermore, by eliminating the bending radius limitation, the diameter of the outlet pipe 30 can be increased as much as possible, reducing flow resistance and pressure drop, making the operation of the gas-liquid separator 100 more energy-efficient. It also simplifies the flow path of the outlet pipe 30, reducing turbulence. Its manufacturing process is also relatively simple and the production cost is low.

[0047] Here, the oil return hole can be set facing the wall at the second end, or it can be set in a direction that is relatively inclined to the wall at the second end.

[0048] In one embodiment, the diameter of the first pipe section 31 is d, and the inner diameter of the cylinder 10 is D, where 1 / 2D ≤ d < D. This configuration ensures that the first pipe section 31 has a sufficiently large diameter to reduce fluid flow resistance, lower flow pressure drop, reduce energy consumption of the gas-liquid separator 100, and improve the user experience.

[0049] Here, the diameter d of the first pipe section 31 can be set to 1 / 2D, 2 / 3D, 4 / 5D, etc. Of course, it is not limited to this; the specific diameter d of the first pipe section 31 can be determined according to actual needs.

[0050] like Figures 2 to 4 As shown, a filter element 322 is provided on the second pipe section 32, and the filter element 322 has an oil return hole 321. The end of the second pipe section 32 away from the first pipe section 31 is used to connect to the connecting pipe 70. The diameter of the oil return hole 321 is smaller than the diameter of the connecting pipe 70, and the oil return hole 321 is configured as a throttling orifice. It can be understood that the filter element 322 can filter solid impurities in the gas-liquid mixture, preventing impurities from flowing to the oil return hole 321 and causing blockage. By configuring the oil return hole 321 as a throttling orifice, the pressure at the oil return hole 321 can be balanced, preventing the compressor from directly drawing oil from the bottom of the cylinder 10 during suction, which would cause some liquid to enter the compressor along with the gas. That is, by setting the throttling orifice, it is ensured that only pure gas enters the compressor, preventing liquid from entering and damaging the compressor.

[0051] like Figures 4 to 7 As shown, the filter element 322 includes a base 3221 and a first filter screen 3224. A mounting hole 323 is provided on the second pipe section 32. One end of the base 3221 extends into the mounting hole 323 and is connected to the second pipe section 32. A filter chamber 3223 with an opening 3222 is provided on the base 3221. An oil return hole 321 is provided at the end of the base 3221 that extends into the mounting hole 323. The oil return hole 321 is connected to the filter chamber 3223. The first filter screen 3224 is fixed to the base 3221 and covers the opening 3222.

[0052] Furthermore, the height of the first filter screen 3224 is set to h2; the distance between the oil return hole 321 and the second end 12 in the height direction of the cylinder 10 is set to h1, where h2≤h1≤h2+(5~10)mm. This setting can prevent impurities at the bottom of the cylinder 10 from entering the oil return hole 321 or causing the oil return hole 321 to become blocked due to the position of the oil return hole 321 being too low, while ensuring that the oil return hole 321 is high enough to return oil in time, shorten the oil return path, and improve the oil return efficiency; at the same time, it makes the position of the oil return hole 321 low enough to increase the overall effective volume of the gas-liquid separator 100.

[0053] In one embodiment, the base 3221 is welded to the second pipe section 32.

[0054] Furthermore, a conical surface 3225 is formed on the base 3221, and the conical surface 3225 is welded to the outer wall of the second pipe section 32.

[0055] In another embodiment, the base 3221 and the second pipe section 32 are fixedly connected by a press-fitting and furnace brazing process. It is understood that the furnace brazing process is oxygen-free, which can prevent the second pipe section 32 or the base 3221 from being oxidized, preventing impurities such as oxide scale from entering the compressor through the second pipe section 32 and causing compressor damage. Furthermore, the press-fitting process can avoid the risk of solder clogging the oil return hole 321 due to misalignment of the first filter screen 3224 and inconsistent welding wire usage, and can also avoid welding defects caused by inconsistent bending deformation rates.

[0056] It should be explained that the base 3221 and the second pipe section 32 can also be connected by threaded connection, crimping, or snap-fit. Of course, this is not the only option; the specific connection method between the base 3221 and the second pipe section 32 can be determined according to the actual situation.

[0057] In one embodiment, the inner diameter of at least a portion of the filter chamber 3223 gradually decreases from the opening 3222 to the return oil hole 321. This arrangement forms a guide surface to direct the liquid to the position of the first filter screen 3224, where it is filtered before entering the return oil hole 321.

[0058] Please continue to refer to this. Figures 2 to 6 One end of the base 3221 that extends into the mounting hole 323 protrudes from the inner wall 324 of the second pipe section 32. This arrangement ensures the sealing of the connection structure between the base 3221 and the second pipe section 32, ensuring that liquid can pass through the return oil hole 321 before entering the second pipe section 32, and ensuring that the fluid passing through the return oil hole 321 can smoothly enter the second pipe section 32, thereby improving the stability of the return oil of the gas-liquid separator 100.

[0059] In one embodiment, the base 3221 is attached to the outer wall of the second pipe segment 32.

[0060] like Figure 2 As shown, in one embodiment, the gas-liquid separator 100 further includes a second filter screen 40, which is fixed to the inner wall 324 of the cylinder 10 and divides the cylinder 10 into a first chamber 41 and a second chamber 42 in the height direction of the cylinder 10. The first chamber 41 is located above the second chamber 42. An oil return hole 321 is located in the second chamber 42. It is understood that the second filter screen 40 can filter the gas-liquid mixture, and the oil return hole 321 is located in the second chamber 42 to ensure that the liquid passing through the oil return hole 321 is filtered, preventing liquid containing impurities from clogging the oil return hole 321.

[0061] Please continue to refer to this. Figure 1 and Figure 2 The gas-liquid separator 100 also includes a baffle 50, a sleeve 60, and a connecting pipe 70. The baffle 50 is located inside the cylinder 10, with one end connected to the first pipe section 31 and the other end fixed to the cylinder 10. The sleeve 60 is fitted onto the section of the second pipe section 32 away from the first pipe section 31 and passes through the cylinder 10. One end of the connecting pipe 70 is connected to the sleeve 60, and the other end is used to connect to the compressor. It is understood that the baffle 50 increases the stability of the outlet pipe 30 installation, preventing it from shaking during operation, reducing abnormal noise, and improving structural robustness. The sleeve 60 connects the connecting pipe 70 to the second pipe section 32, ensuring a tight seal between them and preventing gas from escaping and being wasted from the oil return hole 321, thus ensuring sufficient oil supply to the compressor.

[0062] 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.

[0063] 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. A gas-liquid separator, comprising a cylinder (10), an inlet pipe (20), and an outlet pipe (30), wherein, in the height direction of the cylinder (10), the cylinder (10) has a first end (11) and a second end (12), and the first end (11) is located above the second end (12), the inlet pipe (20) is located at the first end (11) and connected to the cylinder (10), and communicates with the interior of the cylinder (10); Its features are, The air outlet pipe (30) is at least partially disposed inside the cylinder (10) and includes a first pipe section (31) and a second pipe section (32) that are connected and communicate with each other. The first pipe section (31) extends along the height direction of the cylinder (10) and forms an air inlet (311) at the end of the first pipe section (31) near the first end (11). The second pipe section (32) is located at the end of the first pipe section (31) near the second end (12) and extends along the radial direction of the cylinder (10) to form an "L" shaped structure with the first pipe section (31). Furthermore, the second pipe section (32) is provided with an oil return hole (321), which connects the interior of the second pipe section (32) with the cylinder (10), and the oil return hole (321) is located on the wall surface of the second pipe section (32) facing the second end (12).

2. The gas-liquid separator according to claim 1, characterized in that, The second pipe section (32) is provided with a filter element (322), and the filter element (322) is provided with the oil return hole (321). The end of the second pipe section (32) away from the first pipe section (31) is used to connect to the connecting pipe (70). The diameter of the oil return hole (321) is smaller than the diameter of the connecting pipe (70), and the oil return hole (321) is configured as a throttling hole.

3. The gas-liquid separator according to claim 2, characterized in that, The filter element (322) includes a base (3221) and a first filter screen (3224). The second pipe section (32) has an installation hole (323). One end of the base (3221) extends into the installation hole (323) and is connected to the second pipe section (32). The base (3221) has a filter chamber (3223) with an opening (3222). The base (3221) has an oil return hole (321) at one end that extends into the mounting hole (323). The oil return hole (321) is connected to the filter chamber (3223). The first filter screen (3224) is fixed to the base (3221) and covers the opening (3222).

4. The gas-liquid separator according to claim 3, characterized in that, The height of the first filter screen (3224) is set to h2; in the height direction of the cylinder (10), the distance between the oil return hole (321) and the second end (12) is set to h1, h2≤h1≤h2+(5~10)mm.

5. The gas-liquid separator according to claim 3, characterized in that, A conical surface (3225) is formed on the base (3221), and the conical surface (3225) is welded to the second pipe section (32).

6. The gas-liquid separator according to claim 3, characterized in that, From the opening (3222) to the return oil hole (321), the inner diameter of at least part of the filter chamber (3223) gradually decreases.

7. The gas-liquid separator according to claim 3, characterized in that, One end of the base (3221) that extends into the mounting hole (323) protrudes from the inner wall (324) of the second pipe section (32).

8. The gas-liquid separator according to claim 1, characterized in that, The gas-liquid separator further includes a second filter screen (40), which is fixed to the inner wall (324) of the cylinder (10) and divides the cylinder (10) into a first chamber (41) and a second chamber (42) in the height direction of the cylinder (10), with the first chamber (41) located above the second chamber (42); The oil return hole (321) is located in the second cavity (42).

9. The gas-liquid separator according to claim 1, characterized in that, The diameter of the first pipe section (31) is d, and the inner diameter of the cylinder (10) is D, where 1 / 2D≤d<D.

10. The gas-liquid separator according to any one of claims 1-9, characterized in that, The gas-liquid separator also includes a baffle (50), a sleeve (60), and a connecting pipe (70). The baffle (50) is disposed inside the cylinder (10), and one end of the baffle (50) is connected to the first pipe section (31), while the other end is fixed to the cylinder (10). The sleeve (60) is sleeved on a section of the second pipe section (32) away from the first pipe section (31) and passes through the cylinder (10). One end of the connecting pipe (70) is connected to the sleeve (60), and the other end is used to connect to the compressor.

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