Pipe fitting structure and oil separator

Abstract

The application provides a pipe structure, which comprises a main body part, a side wall part of the main body part is provided with at least one through hole part, a center line of the through hole part does not intersect with a center line of the main body part, the through hole part comprises a through hole, and the through hole part comprises an extension part which is formed by processing the through hole of the side wall part by a hot melt drill; the extension part extends from the side wall part to both sides of the side wall part, so that the processing convenience and the processing efficiency of the through hole part can be relatively improved.

Description

Technical Field

[0001] This application belongs to the field of air conditioning system technology, and specifically relates to a pipe structure and an oil separator. Background Technology

[0002] Many components in air conditioning systems require radial connection pipes, such as collection pipes, connecting pipes, oil separators, mufflers, and liquid storage tanks. The holes that connect to the pipes to be connected usually adopt a flanged structure. However, if the flanged hole is eccentric, the machining of the flanged hole will be affected by the machining dimensions. For example, if the eccentric position is too large, the machining efficiency will be very low, and the flange height dimension will be inconsistent, failing to meet the technical requirements. In some cases, the flanged mold may not be able to be correspondingly machined. Utility Model Content

[0003] Therefore, it is necessary to address the above problems, and the specific technical solutions are as follows:

[0004] A pipe fitting structure includes a main body, and a side wall portion of the main body is provided with at least one through hole portion. The center line of the through hole portion does not intersect with the center line of the main body portion. The through hole portion includes a through hole and an extension portion. The extension portion is formed by machining the through hole on the side wall portion with a thermoforming drill. The extension portion extends from the side wall portion to both sides of the side wall portion.

[0005] The pipe fitting structure provided in this application has an eccentric through-hole portion on its side wall. During the machining of the through-hole using a thermoforming drill, extension portions are formed extending from both sides of the side wall. Compared to the flanged holes machined by common flanging dies in the prior art, the through-hole portion obtained by thermoforming has better dimensional consistency, the tooling process is simple and convenient to implement, and it is less affected by the machining dimensions. For example, when the eccentricity of the through-hole portion is too large, conventional flanging dies do not have enough space to work. In addition, the extension portions extending to both sides of the side wall can increase the effective connection length between the through-hole portion and the pipe to be imported, further improving the welding strength and quality.

[0006] An oil separator includes a main body and an inlet pipe. A through-hole is provided on the side wall of the main body. The centerline OE of the through-hole does not intersect the centerline OF of the main body. The through-hole includes a through hole and an extension. The extension is formed by machining the through hole into the side wall using a thermoforming drill. The extension extends from the side wall to both sides of the side wall. The inlet pipe includes a mating end that is inserted into the through-hole. The end face of the mating end is located between the two end faces of the extension. At least a portion of the outer wall of the mating end is welded to at least a portion of the inner wall of the extension.

[0007] The oil separator provided in this application has an eccentrically positioned through-hole. During the machining of the through-hole using a thermoforming drill, an extension is formed extending from the sidewall to both sides of the sidewall. This extension increases the effective connection length between the inlet pipe and the through-hole, thereby further improving the connection strength and quality between the two. In addition, the through-hole with the extension obtained by thermoforming has better dimensional consistency. When connected with the inlet pipe, the inner wall of the through-hole fits better with the outer wall of the inlet pipe, which is more conducive to the filling of solder, thereby further improving the welding quality and connection strength. Furthermore, when the end face of the mating end is located between the two end faces of the extension, part of the extension can act as a guide pipe, guiding a portion of the mixed airflow from the inlet pipe 3 to the inner wall of the main body to improve the oil separation effect and make the oil return more stable. This also prevents the mating end from interfering with the outlet pipe when inserted into the main body, and also reduces the length of the inlet pipe, further reducing its material cost. Attached Figure Description

[0008] Figure 1 This is a structural diagram of a pipe fitting.

[0009] Figure 2 for Figure 1 A sectional projection view of the pipe fitting structure;

[0010] Figure 3 for Figure 1 Cross-sectional projection view of the pipe fitting structure;

[0011] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0012] Figure 5 This is a schematic diagram of the structure of an oil separator;

[0013] Figure 6 for Figure 5 A partial sectional view of the oil separator from the front;

[0014] Figure 7 for Figure 5 A top-view partial cross-sectional view of an oil separator;

[0015] Figure 8 A partial top sectional view of another type of oil separator;

[0016] 100. Oil separator; 1. Main body; 10. Side wall; 2. Through hole; 20. Through hole; 21. Extension; 211. First extension section; 212. Second extension section; J. First plane; 3. Inlet pipe; 4. Liquid outlet pipe; 5. Gas outlet pipe; H1. First distance; H2. Second distance; 31. Mating end; 2111. First end face; 2121. Second end face; Detailed Implementation

[0017] To make this application clearer, specific embodiments are described below with reference to the accompanying drawings: Many components in air conditioning systems require radial connection pipes, such as collection pipes, connecting pipes, gas collection pipes, oil separators, silencers, and liquid storage tanks. The holes connecting to the pipes to be connected usually adopt a flanged structure. However, if the hole is eccentric, the processing of the eccentric flanged hole will be affected by the processing dimensions. For example, if the eccentric position is too large, it will lead to very low processing efficiency, poor consistency of flange height and flanged hole diameter, and failure to meet technical requirements. It may even lead to situations where the mold cannot be corresponding to the processing. In addition, flange cracking, insufficient flange height, and low pass rate are also prone to occur during the processing of flanged holes. For example, when using thin-walled stainless steel, flange cracking and low pass rate are easy to occur during the processing of flanged holes.

[0018] To address the aforementioned technical problems, this application provides a pipe fitting structure, see reference. Figures 1-4This pipe fitting structure can be applied to air conditioning systems that require radially connected pipes, such as collection pipes, gas collection pipes, connecting pipes, oil separators, silencers, and liquid storage tanks. The structure includes a main body 1 with sidewalls 10. At least one through-hole 2 is provided on the sidewall 10 of the main body 1. The centerline OE of the through-hole 2 does not intersect with the centerline OF of the main body 1; that is, the through-hole 2 is an eccentric hole. The centerline OE of the through-hole 2 is parallel to the centerline OF of the main body 1. The centerline OE of the through-hole 2 and the centerline OF of the main body 1 can be perpendicular or at an angle. Preferably, the centerline OE of the through-hole 2 is parallel to and perpendicular to the centerline OF of the main body 1. This arrangement facilitates operation and machining of the through-hole 2, and also facilitates assembly and fixing during subsequent pipe connection. If applied to an oil separator, it can also avoid interference with the gas outlet pipe 5 and make efficient use of the space within the main body 1. The through hole portion 2 includes a through hole 20 and an extension portion 21. The extension portion 21 is formed by machining the through hole 20 into the side wall portion 10 with a hot melt drill. The extension portion 21 extends from the side wall portion 10 to both sides of the side wall portion 10. Preferably, the extension portion 21 extends along the center line OE of the through hole portion 2 to both sides of the side wall portion 10. The pipe fitting structure provided in this application has an eccentric through hole 2 on its side wall 10. During the process of machining the through hole 20 on the main body 1 using a hot melt drill, an extension 21 is formed extending from the side wall 10 to both sides of the side wall 10. Compared with the common flanging process in the prior art, which mainly includes punching and flanging processes, the eccentric structure of the flanging hole makes the traditional flanging die design complex, the effective length of the welded fit between the machined flanging hole and the pipe fitting to be connected is short, and the processing efficiency is low, which is not conducive to subsequent welding connection and mass production. However, the through hole 2 processed by the hot melt drilling process has good dimensional consistency, the tooling process is simple to implement, and the effective length of the welded fit after hot melting is increased, which further improves the subsequent welding strength and quality. In addition, the hot melt drilling process is less affected by the processing size. For example, the conventional flanging die performs flanging processing from the inside of the main body 1 outward. When the eccentric size of the through hole 2 is too large, the conventional flanging die has no working space inside the main body 1, while the hot melt drill can complete the processing of the through hole 2 more conveniently and efficiently.

[0019] Furthermore, the extension 21 is an integral structure with the main body 1. The extension 21 includes a first extension segment 211 and a second extension segment 212 that are connected to each other. Along the direction of the center line OE of the through hole 2, the first extension segment 211 and the second extension segment 212 extend from the side wall portion 10 in opposite directions. That is, one of the first extension segment 211 and the second extension segment 212 is inside the main body 1, and the other is outside the main body 1. It can also be considered that, along the direction of the center line OE of the through hole 2, the first extension segment 211 extends from the side wall portion 10 to the inside of the main body 1, and the second extension segment 212 extends from the side wall portion 10 to the outside of the main body 1. Traditional flanging processes can only form flanging on the inner or outer side. Compared with traditional flanging holes, the through hole portion 2 in this application has an extension portion 21 on both the inner and outer sides of the main body portion 1, which increases the effective connection length between the through hole portion 2 and the pipe to be connected, thereby ensuring the connection strength and quality between the pipe structure and the pipe to be connected, and further improving the structural stability.

[0020] Define a plane passing through the centerline OF of the main body 1 and parallel to the centerline OE of the through hole 2 as the first plane J; define the perpendicular distance between the outer wall of the first extension segment 211 and the first plane J as the first distance H1, and the perpendicular distance between the outer wall of the second extension segment 212 and the first plane J as the second distance H2. The extension length L1 of the first extension segment 211 decreases as the first distance H1 increases; the extension length L2 of the second extension segment 212 increases as the second distance H2 increases. (See appendix) Figure 3 and attached Figure 4The extension 21 includes a first end face 2111 and a second end face 2121. The angle between the first end face 2111 and the center line OE of the through hole 2 is α, and the angle between the second end face 2121 and the center line OE of the through hole 2 is β. It can be seen that the two end faces of the extension 21 are not perpendicular to the extension direction of the outer wall portion of the extension 21; or, the two end faces of the extension 21 are not perpendicular to the center line OE of the through hole 2. Alternatively, it can be considered that the angle between the two end faces of the extension 21 and the center line OE of the through hole 2 is greater than 90° or less than 90°. Compared to a structure where the two end faces of the extension 21 are perpendicular to the center line OE of the through hole 2, this configuration results in a longer effective length for the mating connection between the through hole 2 and the pipe fitting to be connected, thereby increasing the connection strength and structural stability between the two. Specifically, the first extension 211 is located inside the sidewall 10, and the second extension 212 is located outside the sidewall 10. The first end face 2111 and the second end face 2121 are parallel to each other. It should be noted that the parallelism mentioned here is not perfect parallelism, but rather close to parallelism. Due to processing errors and the characteristics of hot-melt processing, the material of the main body 1, after melting to form the extension 21, cannot achieve the precision required to make the two end faces completely parallel. In other words, the projection of the through hole 2 onto the plane perpendicular to the center line OF of the main body 1 is approximately a parallelogram. Compared to the structure where the two end faces of the extension 21 are perpendicular to the center line OE of the through hole 2, the projection of the through hole 2 onto the plane perpendicular to the center line OF of the main body 1 is approximately a rectangle or a square. In this design, the effective length of the mating connection between the through hole 2 and the pipe to be connected is longer, thereby increasing the connection strength and structural stability between the two.

[0021] Further reading Figure 3 or Figure 4Along the direction of the center line OE of the through hole 2, the maximum extension length of the first extension segment 211 is defined as L1max, and the minimum extension length of the first extension segment 211 is defined as L1min; the maximum extension length of the second extension segment 212 is defined as L2max, and the minimum extension length of the second extension segment 212 is defined as L2min, satisfying: L1max = L2max; L1min = L2min. It should be noted that due to processing errors and the characteristics of hot melt processing, the equality here is not a perfect equality, but rather close to or approximately equal. With this setting, the effective mating length between the outer wall portion of the extension segment 21 near the first plane J and the pipe to be connected is approximately equal to the effective mating length between the outer wall portion of the extension segment 21 away from the first plane J and the pipe to be connected; that is, the effective mating length of the circumferential wall portion of the pipe to be connected and the extension segment 21 are approximately the same, so that the outer wall portion of the pipe to be connected is subjected to more uniform force, making the connection structure between the two more stable. Furthermore, the difference between the maximum extension length L1max of the first extension segment 211 and the minimum extension length L1min of the first extension segment 211 does not exceed 2mm, that is, L1max-L1min≤2mm; and / or, the difference between the maximum extension length L2max of the second extension segment 212 and the minimum extension length L2min of the second extension segment 212 does not exceed 2mm, that is, L2max-L2min≤2mm; this setting ensures the consistency of the wall thickness of the extension portion 21, which can guarantee the effectiveness and uniformity of the welded segment.

[0022] As mentioned above, traditional flanging dies are typically located inside the main body 1 and then moved outwards to stamp and form a through-hole 2 with an outward flanging. Traditional flanging processes are easily affected by machining dimensions. For example, if the eccentricity of the through-hole 2 is large, the traditional flanging die will lack sufficient working space. A plane passing through the centerline OF of the main body 1 and parallel to the centerline OE of the through-hole 2 is defined as the first plane J. Considering the inner diameter of the through-hole 2, the maximum distance between the inner wall of the through-hole 2 and the first plane J is defined as Hmax. The radius of the main body 1 is defined as R, where R is half the inner diameter of the main body 1; satisfying: R - Hmax < 5mm. In this case, machining the through-hole 2 with a hot-melt drill is more convenient, faster, and more efficient.

[0023] The main body 1 of this pipe fitting structure requires good structural strength, ease of processing, and a high melting point to ensure the integrity of its shape and structure during the machining of the through-hole 2 on the sidewall portion 10 using a hot-melt drill bit. The main body 1 can be made of stainless steel, aluminum, or copper. Furthermore, using stainless steel for the main body 1 addresses the issue that traditional flanging techniques, especially for thin-walled stainless steel pipe fittings, can easily lead to cracking at the edge of the through-hole, reducing the yield rate. However, by machining the through-hole 2 using a hot-melt drill bit, the high temperature generated by the friction between the drill bit and the sidewall portion 10 of the main body 1 forces the main body 1 to form extensions 21 extending inwards and outwards from the sidewall portion 10. This reduces the probability of cracking and harmful cracks in the main body 1. Furthermore, hot-melt processing is used because the heat generated during the process helps reduce the impact of harmful cracks during hole machining, and also eliminates the requirement for annealing of stainless steel materials. Additionally, the material of the fittings to be connected can be the same as or different from the material of the main body 1.

[0024] Furthermore, the cross-section of the extension 21 is annular; the inner diameter of the annular ring is equal to the outer diameter of the pipe to be connected, and the cross-section of the annular ring has the characteristic of uniform circumferential force distribution.

[0025] The aforementioned pipe fitting structure can be used in refrigeration products such as collection pipes, gas collection pipes, connecting pipes, oil separators, silencers, and liquid storage tanks, but is not limited to these products. This pipe fitting structure can be applied to any refrigeration product that requires radial connection of pipe fittings to be connected to the side wall. Specifically, the pipe fitting structure includes the pipe fitting to be connected, the material of which may be the same as or different from the main body 1. The pipe fitting to be connected includes a mating end 31, which is inserted into the through hole 2 and welded to it. Specifically, at least a portion of the outer wall of the mating end is welded to at least a portion of the inner wall of the extension 21. The welding method can be a tunnel welding method. For furnace welding, flame brazing, argon arc welding, laser welding, etc.: Further, the end face of the mating end 31 is located between the two end faces of the extension 21; or, the end face of the mating end 31 is flush with the first end face 2111 of the extension 21; or, the mating end 31 passes through the through hole 2, and the end face of the mating end 31 is located inside the main body 1 and exposed on the first end face 2111; the setting position of the mating end 31 can be selected according to the specific usage scenario. Since the extension 21 is relatively long, it can meet the needs of different positions of the mating end 31, and all of them can meet the welding length. The term "flush" in this text does not only refer to being completely flush, but also includes being nearly flush.

[0026] The following is a detailed description of an oil separator 100. This oil separator 100 adopts the pipe fitting structure described above. The relevant features of the pipe fitting structure are all reflected in the oil separator and will not be repeated below. (See also...) Figures 5-8 The oil separator 100 includes a main body 1 and an inlet pipe 3. The side wall 10 of the main body 1 has a through hole 2. The inlet pipe 3 is inserted into and fixedly connected to the through hole 2. Specifically, the inlet pipe 3 includes a mating end 31, which is inserted into the through hole 2. The end face of the mating end 31 is located between the two end faces of the extension 21. At least a portion of the outer wall of the mating end 31 is welded to at least a portion of the inner wall of the extension 21. The welding connection method can be tunnel furnace brazing, flame brazing, argon arc welding, etc. The centerline OE of the through hole 2 does not intersect with the centerline OF of the main body 1; that is, the through hole 2 is an eccentric hole. The centerline OE of the through hole 2 and the centerline OF of the main body 1 are arranged oppositely. The centerline OE of the through hole 2 and the centerline OF of the main body 1 can be perpendicular or at an angle. Preferably, the centerline OE of the through hole 2 and the centerline OF of the main body 1 are oppositely arranged and perpendicular. This design facilitates operation and machining of the through-hole portion 2, and also makes it easier to fix the inlet pipe 3 during subsequent connection. The through-hole portion 2 includes a through-hole 20 and an extension portion 21. The extension portion 21 is formed by machining the through-hole 20 into the main body portion 1 using a thermoforming drill, and extends from the side wall portion 10 to both sides of the side wall portion 10. The oil separator 100 provided in this application has an eccentrically arranged through-hole portion 2. During the machining of the through-hole 20 using a thermoforming drill, the extension portion 21 extending from the side wall portion 10 to both sides of the side wall portion 10 is formed. The setting of the extension portion 21 increases the effective connection length between the inlet pipe 3 and the through-hole portion 2, thereby further improving the connection strength and quality between the two. In addition, the through-hole portion 2 with the extension portion 21 obtained by thermoforming has better dimensional consistency. When connected with the inlet pipe 3, the inner wall of the through-hole portion 2 fits better with the outer wall of the inlet pipe 3, which is more conducive to the filling of solder, thereby further improving the welding quality and connection strength. Furthermore, when the end face of the mating end 31 is located between the two end faces of the extension 21, part of the extension 21 can act as a guide pipe to guide a portion of the mixed airflow from the inlet pipe 3 to the inner wall of the main body 1 to improve the oil separation effect and make the oil return more stable. This can also prevent the mating end 31 from interfering with the air outlet pipe 5 when inserted into the main body 1, and can also reduce the length of the inlet pipe 3, further reducing its material cost.

[0027] Furthermore, the extension 21 is an integral structure with the main body 1. The extension 21 includes a first extension section 211 and a second extension section 212 that are connected to each other. Along the center line of the through hole 2, the first extension section 211 extends from the side wall 10 to the inside of the main body 1, and the second extension section 212 extends from the side wall 10 to the outside of the main body 1. Traditional flanged holes can only form flanges on the inside or outside. Compared with traditional flanged holes, the through hole 2 of this oil separator 100 has extensions on both the inside and outside of the main body 1, which increases the connection area between the through hole 2 and the inlet pipe 3, thereby ensuring the connection strength between the pipe structure and the inlet pipe 3 and further improving the structural stability.

[0028] Specifically, the extension 21 extends along the center line OE of the through hole 2, which is opposite to and perpendicular to the center line OF of the main body 1. The extension 21 includes a first end face 2111 and a second end face 2121. The first end face 2111 is located inside the main body 1, and the second end face 2121 is located outside the main body 1. The end face of the mating end 31 is located between the first end face 2111 and the second end face 2121. Preferably, the end face of the mating end 31 is parallel to either the first end face 2111 or the second end face 2121.

[0029] Furthermore, the center line of the mating end 31 coincides with the center line of the through hole 2. A plane passing through the center line OF of the main body 1 and parallel to the center line of the mating end 31 is defined as the first plane J. The maximum distance between the inner wall of the through hole 2 and the first plane J is Hmax, and the radius of the main body 1 is R; satisfying: R-Hmax≤5mm. At this time, it is more convenient and faster to process the through hole 2 with a hot melt drill, and the efficiency is higher.

[0030] Here's a brief explanation of the working principle of thermoplastic drilling: When the thermoplastic drill rotates at high speed on the surface of the pipe fitting and is subjected to downward axial pressure, the drill head violently rubs against the side wall of the metal pipe fitting, generating high temperatures. This causes the local metal material in contact with the drill bit to heat up, turn red, and soften rapidly. As the axial pressure increases and the feed depth increases, the contact area between the drill bit and the metal material increases, further increasing the heat generation. The temperature in the processing zone continues to rise, causing the reddened area to expand. As the original molten material inside the hole undergoes thermoplastic flow in both the radial and axial directions under the axial feed and rotation of the drill bit, an extension 21 is formed, and the through hole 2 is rapidly machined.

[0031] In the field of air conditioning technology, the use of a thermoforming drill to process the pipe fitting structure optimizes the forming process of the connecting holes, simultaneously improving the stability of the connection between pipe fittings. This enhances the forming accuracy of the through-hole portion 2, reduces the possibility of burrs during the forming process, increases the effective connection length between the through-hole portion 2 and the pipe fittings to be connected in the air conditioning pipeline, and ensures the brazing penetration depth, thereby guaranteeing the stability of the connection between pipe fittings. Furthermore, the through-hole portion 2, processed by the thermoforming drill, undergoes a normalizing treatment effect upon cooling in air, improving its hardness, rust resistance, and corrosion resistance. This enhances the welding quality during subsequent welding of the pipe fittings to be connected.

[0032] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and intended to aid in understanding the method and core concepts of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A pipe fitting structure, the pipe fitting structure comprising a main body (1), wherein a side wall portion (10) of the main body (1) is provided with at least one through hole portion (2), wherein the center line (OE) of the through hole portion (2) does not intersect with the center line (OF) of the main body portion (1), the through hole portion (2) includes a through hole (20), the through hole portion (2) includes an extension portion (21), the extension portion (21) is formed by machining the through hole (20) on the side wall portion (10) with a hot melt drill, and the extension portion (21) extends from the side wall portion (10) to both sides of the side wall portion (10).

2. The pipe fitting structure according to claim 1, characterized in that, The center line (OE) of the through hole (2) is opposite to the center line (OF) of the main body (1) and is perpendicular to it.

3. The pipe fitting structure according to claim 1 or 2, characterized in that, The extension (21) and the main body (1) are integrally structured. The extension (21) includes a first extension segment (211) and a second extension segment (212) that are connected to each other. Along the center line (OE) of the through hole (2), the first extension segment (211) and the second extension segment (212) extend from the side wall (10) in opposite directions.

4. The pipe fitting structure according to claim 3, characterized in that, A plane passing through the center line (OF) of the main body (1) and parallel to the center line (OE) of the through hole (2) is defined as the first plane (J); the vertical distance between the outer wall of the first extension segment (211) and the first plane (J) is defined as the first distance (H1), and the vertical distance between the outer wall of the second extension segment (212) and the first plane (J) is defined as the second distance (H2). The extension length L1 of the first extension segment (211) decreases as the first distance (H1) increases; the extension length L2 of the second extension segment (212) increases as the second distance (H2) increases.

5. The pipe fitting structure according to claim 4, characterized in that, Along the direction of the center line of the through hole (2), the maximum extension length of the first extension segment (211) is defined as L1max and the minimum extension length of the first extension segment (211) is defined as L1min; the maximum extension length of the second extension segment (212) is defined as L2max and the minimum extension length of the second extension segment (212) is defined as L2min, satisfying: L1max = L2max; L1min = L2min.

6. The pipe fitting structure according to claim 5, characterized in that, The difference between the maximum extension length L1max of the first extension segment (211) and the minimum extension length L1min of the first extension segment (211) is no more than 2mm; and / or, the difference between the maximum extension length L2max of the second extension segment (212) and the minimum extension length L2min of the second extension segment (212) is no more than 2mm.

7. The pipe fitting structure according to any one of claims 4-6, characterized in that, The maximum distance between the inner wall of the through hole (2) and the first plane (J) is Hmax, and the radius of the main body (1) is R; satisfying: R-Hmax≤5mm.

8. The pipe fitting structure according to claim 3, characterized in that, Along the direction of the center line of the through hole (2), the maximum extension length of the first extension segment (211) is defined as L1max and the minimum extension length of the first extension segment (211) is defined as L1min; the maximum extension length of the second extension segment (212) is defined as L2max and the minimum extension length of the second extension segment (212) is defined as L2min, satisfying: L1max = L2max; L1min = L2min.

9. An oil separator, the oil separator comprising a main body (1) and an inlet pipe (3), wherein a through hole (2) is provided on a side wall (10) of the main body (1), the center line (OE) of the through hole (2) does not intersect with the center line (OF) of the main body (1), the through hole (2) includes a through hole (20), the through hole (2) includes an extension (21), the extension (21) is formed by machining the through hole (20) on the side wall (10) with a hot melt drill, the extension (21) extends from the side wall (10) to both sides of the side wall (10); the inlet pipe (3) includes a mating end (31), the mating end (31) is inserted into the through hole (2), the end face of the mating end (31) is located between the two end faces of the extension (21), and at least a portion of the outer wall of the mating end (31) is welded to at least a portion of the inner wall of the extension (21).

10. The oil separator according to claim 9, characterized in that, The extension (21) extends along the center line (OE) of the through hole (2), which is opposite to and perpendicular to the center line (OF) of the main body (1). The extension (21) includes a first end face (2111) and a second end face (2121). The first end face (2111) is located inside the main body (1), and the second end face (2121) is located outside the main body (1). The end face of the mating end (31) is located between the first end face (2111) and the second end face (2121).

11. The oil separator according to claim 9, characterized in that, The center line of the mating end (31) is consistent with the center line of the through hole (2). A plane that passes through the center line (OF) of the main body (1) and is parallel to the center line of the mating end (31) is defined as the first plane (J). The maximum distance between the inner wall of the through hole (2) and the first plane (J) is Hmax, and the radius of the main body (1) is R. The following conditions must be met: R-Hmax≤5mm.

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