Double tube liquid accumulator for air conditioner compressor

Abstract

The application discloses a double-pipe liquid accumulator of an air conditioner compressor, which comprises a cylinder body, two gas outlet bends and a gas inlet pipe arranged at one end of the cylinder body, and is characterized in that the one end of the cylinder body is tapered and shrunk, the small-diameter end of the tapered section is provided with a cylindrical neck opening to form a gas inlet port, the other end of the cylinder body is a flat bottom surface which is connected with the round corner of the middle cylinder body, two conical outer bosses are arranged on the flat bottom surface, and a gas outlet port is arranged in the middle of each outer boss; the gas outlet bends and the gas inlet pipe are formed by composite welding of copper pipe sections and iron pipe sections; or the gas outlet bends and the gas inlet pipe are made of iron pipes and are locally plated with copper; compared with the use of copper pipes, the composite welding of the copper pipe sections and the iron pipe sections can greatly reduce the use amount of copper, and the use of copper can also be reduced by making the gas outlet bends and the gas inlet pipe of iron and locally plating copper, only the key parts which need to be welded with the compressor or other components are plated with copper, and the cost is reduced to the maximum extent.

Description

Technical Field

[0001] This application belongs to the field of liquid receivers, and particularly relates to a dual-tube liquid receiver for an air conditioning compressor. Background Technology

[0002] The receiver is a core component of a compressor system, undertaking crucial functions such as gas-liquid separation, refrigerant buffering, filtration, and noise reduction. In a twin-cylinder compressor system, the dual-tube receiver, through its unique dual-inlet and single-outlet design, achieves efficient refrigerant distribution and gas-liquid separation, directly ensuring the stability and energy efficiency of the compressor operation. However, the outlets of existing compressors are mostly made of pure copper, primarily because copper's thermal conductivity, corrosion resistance, and ductility are suitable for the compressor's operating environment. To ensure welding reliability (i.e., copper-to-copper welding), the outlet bend connecting the dual-tube receiver to the compressor and the outlet pipe connecting to upstream equipment (condenser) are also made of copper. The high cost of copper leads to high manufacturing costs for dual-tube receivers. Therefore, the existing technology needs further improvement. Utility Model Content

[0003] This invention provides a dual-tube liquid receiver for air conditioning compressors to reduce the manufacturing cost of dual-tube liquid receivers.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A dual-pipe liquid receiver for an air conditioning compressor includes a cylindrical body and two outlet bends and an inlet pipe disposed at one end thereon. One end of the cylindrical body tapers into a cone shape, and the small-diameter end of the cone section is provided with a cylindrical neck to form an air inlet. The other end of the cylindrical body is a flat bottom surface that transitions to the rounded corner of the middle part of the cylindrical body. Two conical protrusions are provided on the flat bottom surface, and an air outlet is opened in the middle of each protrusion. The inlet pipe is disposed at the air inlet along the axial direction of the cylindrical body, and the two outlet bends are respectively disposed at the two air outlets along the axial direction of the cylindrical body. Both the exhaust bend and the intake pipe are formed by composite welding of copper pipe sections and iron pipe sections; Alternatively, the exhaust bend and intake pipe may be made of iron pipe with partial copper plating. Both the exhaust bend and the intake pipe have integrally formed welded bosses on their iron pipe sections. The welded bosses of the intake pipe are connected to the intake end face of the cylinder or the welded bosses of the exhaust bend are connected to the exhaust end face of the cylinder by resistance welding.

[0005] In a preferred embodiment, the exhaust bend includes a copper straight pipe and a main body section. The main body section includes a vertical straight pipe section, a bend section, and a horizontal straight pipe section that are integrally formed and connected in sequence. The outer side of the vertical straight pipe section is provided with a welding boss. The copper straight pipe can be inserted into the horizontal straight pipe section. The end face of the horizontal straight pipe section is flame-brazed to the outer wall of the copper straight pipe to connect the copper straight pipe and the main body section.

[0006] In a preferred embodiment, the exhaust bend includes a copper bend and a straight pipe section. A welding boss is provided on the outer side of the straight pipe section. One end of the copper bend can be inserted into the straight pipe section. The end face of the straight pipe section is flame-brazed to the outer wall of the copper bend to connect the copper bend and the straight pipe section.

[0007] In a preferred embodiment, the openings of the two exhaust bends face the same direction and are on the same plane, and the copper pipe sections or copper-plated sections of the two exhaust bends are of the same length.

[0008] In a preferred embodiment, the intake pipe includes an integrally formed iron pipe with a welding boss on its outer wall, and a copper pipe with a wide diameter section and a narrow diameter section. The narrow diameter section of the copper pipe is inserted into the iron pipe, and the wide diameter section of the copper pipe is located on the upper side of the end of the iron pipe. A welding space is left between the wide diameter section of the copper pipe and the end of the iron pipe. The welding space is used for welding operations to achieve a fixed connection between the copper pipe and the iron pipe.

[0009] In a preferred embodiment, the conical section and cylindrical neck of the cylinder are formed by an integral spinning process, while the middle cylinder, the flat bottom with rounded corners, and the external boss with an air outlet are formed by a stretching and stamping process to reduce welding joints.

[0010] In a preferred embodiment, a middle plate is provided inside the cylinder, and the middle plate has two clearance holes corresponding to the air outlets. The pipe sections of the two air outlet bends located inside the cylinder pass through the two clearance holes respectively.

[0011] In a preferred embodiment, a filter screen is also provided inside the cylinder. The filter screen is parallel to the middle plate, with one side close to the air inlet pipe and the other side close to the air outlet bend pipe located at the opening of the pipe section inside the cylinder.

[0012] In a preferred embodiment, the outer side of the cylinder is provided with grooves that are recessed toward the inside of the cylinder, corresponding to the outer side of the middle plate and the filter screen, and a limiting protrusion is formed inside the cylinder to limit the middle plate and the filter screen.

[0013] In a preferred embodiment, the welding boss includes a cylindrical lap joint with a diameter equal to the small end diameter of the conical outer boss, and a large truncated cone, a cylindrical truncated cone, and a small truncated cone with successively decreasing diameters on the lower side of the lap joint. This ensures the parallelism between the air inlet pipe and the air outlet bend and the cylinder axis when they are inserted into the cylinder and ensures complete contact of the welding parts, thereby improving the welding quality and strength of the resistance welding.

[0014] The above structure has the following beneficial effects: The exhaust bend and inlet pipe are formed by composite welding of copper and iron pipe sections, significantly reducing copper usage compared to using all copper pipes. Since copper is relatively expensive, this composite pipe design effectively reduces pipe costs, thereby lowering the overall manufacturing cost of the dual-pipe reservoir. The exhaust bend and inlet pipe are made of iron pipe with partial copper plating, further reducing copper usage. Copper plating is only applied to critical areas requiring welding to the compressor or other components, ensuring welding reliability and conductivity while minimizing costs.

[0015] Both the exhaust bend and the intake pipe have integrally formed welding bosses on their iron pipe sections, which facilitates the welding operation. Resistance welding is used to connect the welding bosses of the intake pipe to the intake end face of the cylinder, or the welding bosses of the exhaust bend to the exhaust end face of the cylinder. Resistance welding has advantages such as short heating time, fast welding speed, and small heat-affected zone, ensuring the quality and strength of the weld joint and reducing welding defects. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain this application and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 A schematic cross-sectional view of a first embodiment of the dual-tube liquid receiver for the air conditioning compressor of this application is shown. Figure 2 A schematic cross-sectional view of a second embodiment of the dual-tube liquid receiver for the air conditioning compressor of this application is shown; Figure 3 A schematic three-dimensional structural diagram of the air outlet bend and cylinder of the dual-pipe liquid receiver of the air conditioning compressor of this application is shown; Label Explanation: 1. Cylinder body; 10. Conical section; 11. Cylindrical neck; 110. Air inlet; 12. Flat bottom; 13. Outer boss; 130. Air outlet; 14. Groove; 2. Air outlet bend; 20. Copper straight pipe; 21. Main body section; 210. Vertical straight pipe section; 211. Bend section; 212. Horizontal straight pipe section; 22. Copper bend; 23. Straight pipe section; 3. Air inlet pipe; 30. Iron pipe; 31. Copper pipe; 4. Welding boss; 40. Cylindrical overlapping platform; 41. Large truncated cone; 42. Cylindrical platform; 43. Small truncated cone; 5. Middle plate; 50. Clearance hole; 6. Filter screen. Detailed Implementation

[0017] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit and scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0018] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In this utility model, unless otherwise expressly specified and limited, the first feature being "upper" or "lower" than the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0019] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two main bodies at the connection point are not connected by an intermediate structure, but are simply connected to form a whole through a connecting structure. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0020] In this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0021] The present invention will now be described with reference to the accompanying drawings.

[0022] The specific solution adopted is as follows: like Figure 1-3As shown, this utility model provides a dual-pipe liquid receiver for an air conditioning compressor, including a cylindrical body 1 and two outlet bends 2 and an inlet pipe 3 disposed at one end thereon. One end of the cylindrical body 1 is tapered, and the small-diameter end of the tapered section 10 is provided with a cylindrical neck 11 to form an inlet 110. The other end of the cylindrical body 1 is a flat bottom surface 12 that transitions to the rounded corner of the middle cylindrical body 1. Two conical outer protrusions 13 are provided on the flat bottom surface 12, and an outlet 130 is opened in the middle of each outer protrusion 13. The inlet pipe 3 is disposed along the axial direction of the cylindrical body 1 at the inlet 110, and the two outlet bends 2 are respectively disposed along the axial direction of the cylindrical body 1 at the two outlets 130. Both the exhaust bend 2 and the intake pipe 3 are formed by composite welding of copper pipe sections and iron pipe sections; Alternatively, the exhaust bend 2 and the intake pipe 3 may be made of iron pipe 30 with partial copper plating. Both the exhaust bend 2 and the intake pipe 3 have an integrally formed welded boss 4 on the iron pipe 30. The welded boss 4 of the intake pipe 3 is connected to the end face of the intake port 110 of the cylinder 1 or the welded boss 4 of the exhaust bend 2 is connected to the end face of the exhaust port 130 of the cylinder 1 by resistance welding.

[0023] The dual-pipe liquid receiver for the air conditioning compressor of this application has a conical constriction at one end of the cylinder 1, which guides the refrigerant to enter the cylinder 1 more smoothly, reducing turbulence and energy loss during the entry process and improving the refrigerant flow efficiency. A cylindrical neck 11 at the small-diameter end of the conical section 10 forms an air inlet 110, which further controls the refrigerant's inflow speed and direction, ensuring uniform distribution of the refrigerant within the cylinder 1, which is beneficial for subsequent gas-liquid separation. The other end of the cylinder 1 is a flat bottom surface 12 with a rounded corner transition to the middle cylinder 1. This rounded corner design disperses stress, preventing stress concentration at the bottom of the cylinder 1, thereby improving the structural strength and stability of the cylinder 1. Two conical external protrusions 13 on the flat bottom surface 12 not only provide a stable support structure for the air outlet 130, but the conical shape also enhances the strength of the external protrusions 13 themselves to a certain extent, reducing the risk of deformation due to stress.

[0024] The exhaust bend 2 and the intake pipe 3 are formed by composite welding of copper and iron pipe sections, which significantly reduces the amount of copper used compared to using only copper pipes 31. Since copper is relatively expensive, this composite pipe design effectively reduces the cost of the pipes, thereby lowering the overall manufacturing cost of the dual-pipe reservoir.

[0025] In another design, the exhaust bend 2 and the intake pipe 3 are made of iron pipe 30 with partial copper plating, which also reduces the amount of copper used. Copper plating is only applied to critical parts such as those that need to be welded to the compressor or other components, ensuring the reliability and conductivity of the welds while minimizing costs.

[0026] Iron pipe 30 possesses good strength and rigidity, meeting the mechanical performance requirements of pipes in air conditioning compressor systems. Simultaneously, through composite welding or partial copper plating, the excellent electrical conductivity, thermal conductivity, and corrosion resistance of copper can be taken into account, ensuring that the outlet bend 2 and inlet pipe 3 can function normally during refrigerant flow, and that the operating efficiency and stability of the entire compressor system will not be affected by pipe performance issues.

[0027] Both the exhaust bend 2 and the intake pipe 3 have integrally formed welding bosses 4 on their iron pipe 30 sections. This design makes the welding area more regular and concentrated, which is beneficial for welding operations. The welding bosses 4 of the intake pipe 3 are connected to the end face of the intake port 110 of the cylinder 1, or the welding bosses 4 of the exhaust bend 2 are connected to the end face of the exhaust port 130 of the cylinder 1, using resistance welding. Resistance welding has advantages such as short heating time, fast welding speed, and small heat-affected zone, which can ensure the quality and strength of the welded joint, reduce the occurrence of welding defects, and improve production efficiency. There are no additional connecting gaps between the integrally formed welding bosses 4 and the iron pipe 30, avoiding problems such as leakage caused by weak connection.

[0028] The air outlet bend 2 of the composite welded connection can be implemented using one of the following embodiments: In one embodiment, see Figure 1 The venting bend 2 includes a copper straight pipe 20 and a main body section 21. The main body section 21 includes a vertically formed straight pipe section 210, a bend section 211, and a horizontal straight pipe section 212 connected in sequence. A welding boss 4 is provided on the outer side of the vertical straight pipe section 210. The copper straight pipe 20 can be inserted into the horizontal straight pipe section 212. The end face of the horizontal straight pipe section 212 is flame-brazed to the outer wall of the copper straight pipe 20 to connect the copper straight pipe 20 to the main body section 21. By using copper straight pipe 20 in a partial manner and iron pipe 30 in the main body section 21, the amount of copper used is greatly reduced compared to manufacturing the venting bend 2 entirely with copper. Since copper is relatively expensive, reducing copper usage directly lowers raw material costs, thereby reducing the overall cost of the venting bend 2. Processing the copper straight pipe 20 and the main body section 21 separately avoids material waste or processing difficulties caused by unsuitable processing techniques, improving overall processing efficiency and product quality.

[0029] In another embodiment, see Figure 2 The exhaust bend 2 includes a copper bend 22 and a straight pipe section 23. A welding boss 4 is provided on the outer side of the straight pipe section 23. One end of the copper bend 22 can be inserted into the straight pipe section 23. The end face of the straight pipe section 23 is flame-brazed to the outer wall of the copper bend 22 to connect the copper bend 22 and the straight pipe section 23. Similarly, compared with the exhaust bend 2 being made entirely of copper material, the amount of copper used is greatly reduced.

[0030] Furthermore, due to the plug-in connection structure, maintenance personnel can easily pull the copper elbow 22 out of the straight pipe section 23 for replacement or repair. This eliminates the need for complex disassembly and replacement of the entire outlet elbow 2, improving maintenance efficiency and reducing maintenance costs.

[0031] In a preferred embodiment of this application, the openings of the two air outlet bends 2 face the same direction and are on the same plane, and the copper pipe sections or copper-plated sections of the two air outlet bends 2 are of the same length.

[0032] While meeting installation requirements, the copper pipe sections or copper-plated sections of the two bends are of consistent length, which directly promotes standardization in mass production. In the composite welding process, only a single specification of copper pipe 31 needs to be produced, avoiding hidden costs such as mold replacement and production line adjustment caused by size differences. For example, traditional multi-specification production requires frequent equipment debugging, while with standardized specifications, a single debugging can cover a larger batch, significantly reducing the fixed cost per unit product.

[0033] During copper plating, the immersion depth of the two air outlet bends can be kept consistent, simplifying the batch copper plating process. Traditional differentiated copper plating requires adjusting parameters for different lengths, while with a uniform depth, parameters such as plating solution concentration, temperature, and time can be fixed, reducing process debugging time and material waste. Simultaneously, batch copper plating improves equipment utilization and reduces energy consumption and labor costs per unit product.

[0034] In a preferred embodiment of this application, the intake pipe 3 includes an integrally formed iron pipe 30 with welding bosses 4 on its outer wall, and a copper pipe 31 with a wide diameter section and a narrow diameter section. The narrow diameter section of the copper pipe 31 is inserted into the iron pipe 30, and the wide diameter section of the copper pipe 31 is located on the upper side of the end of the iron pipe 30. A welding space is left between the wide diameter section of the copper pipe 31 and the end of the iron pipe 30. The welding space is used for welding operations to achieve a fixed connection between the copper pipe 31 and the iron pipe 30. The intake pipe 3 also adopts a partial copper-using process, which directly reduces copper consumption. The annular gap between the wide diameter section of the copper pipe 31 and the end of the iron pipe 30 forms a dedicated welding cavity, which can achieve a fast and high-strength connection, and the welding heat-affected zone is small, avoiding excessive erosion of the copper pipe 31.

[0035] See Figure 3 The conical section 10 and cylindrical neck 11 of the cylinder 1 are integrally formed by spinning. The middle cylinder 1, the flat bottom surface 12 with rounded corners, and the external boss 13 with an air outlet 130 are formed by stretching and stamping to reduce welding joints. Traditional dual-tube liquid reservoirs require multiple welds along the conical section-cylinder 1-bottom surface, while this application only retains welds at key connection points, greatly reducing the number of welds and significantly lowering the probability of welding defects.

[0036] See Figure 1 and Figure 2The cylinder 1 is provided with a middle plate 5. The middle plate 5 has two clearance holes 50 corresponding to the air outlet 130. The pipe sections of the two air outlet bends 2 located in the cylinder 1 pass through the two clearance holes 50 respectively. In addition, the cylinder 1 is also provided with a filter screen 6. The filter screen 6 is parallel to the middle plate 5, with one side close to the air inlet pipe 3 and the other side close to the opening of the pipe section of the air outlet bend 2 located in the cylinder 1. The outer side of the cylinder 1 is provided with grooves 14 that are recessed towards the inside of the cylinder, corresponding to the outer side of the middle plate 5 and the filter screen 6. These grooves form a limiting protrusion in the cylinder to limit the middle plate 5 and the filter screen 6. The filter screen 6 can intercept particulate impurities, metal debris or welding slag in the refrigerant. The middle plate 5, in conjunction with the structure of the cylinder 1, plays the role of supporting the cylinder 1 and dividing the cavity of the cylinder 1.

[0037] As a preferred embodiment of this application, the welding boss 4 includes a cylindrical lap platform 40 with a diameter equal to the small end diameter of the conical outer boss 13, and a large conical 41, a cylindrical 42, and a small conical 43 with successively decreasing diameters on the lower side of the lap platform. The stepped structure ensures that the welding parts achieve surface contact rather than line contact in both the axial and radial directions, avoids resistance fluctuations caused by poor contact, improves the stability of the welding current, reduces defects such as weld porosity and cracks, and improves the welding quality and strength of resistance welding.

[0038] For any parts not mentioned in this utility model, existing technologies can be used or referenced.

[0039] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A dual-pipe liquid receiver for an air conditioning compressor, comprising a cylindrical body and two outlet bends and an inlet pipe disposed at one end thereof, characterized in that, One end of the cylinder tapers into a cone shape, and the small-diameter end of the cone section is provided with a cylindrical neck to form an air inlet. The other end of the cylinder is a flat bottom surface that transitions to the rounded corner of the middle cylinder. Two conical protrusions are provided on the flat bottom surface, and an air outlet is opened in the middle of each protrusion. The air inlet pipe is located at the air inlet along the axial direction of the cylinder, and two air outlet bends are respectively located at the two air outlets along the axial direction of the cylinder. Both the exhaust bend and the intake pipe are formed by composite welding of copper pipe sections and iron pipe sections; Alternatively, the exhaust bend and intake pipe may be made of iron pipe with partial copper plating. Both the exhaust bend and the intake pipe have integrally formed welded bosses on their iron pipe sections. The welded bosses of the intake pipe are connected to the intake end face of the cylinder or the welded bosses of the exhaust bend are connected to the exhaust end face of the cylinder by resistance welding.

2. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The exhaust bend includes a copper straight pipe and a main body section. The main body section includes a vertical straight pipe section, a bend section, and a horizontal straight pipe section that are integrally formed and connected in sequence. The outer side of the vertical straight pipe section is provided with a welding boss. The copper straight pipe can be inserted into the horizontal straight pipe section. The end face of the horizontal straight pipe section is flame-brazed to the outer wall of the copper straight pipe to connect the copper straight pipe and the main body section.

3. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The exhaust bend includes a copper bend and a straight pipe section. A welding boss is provided on the outside of the straight pipe section. One end of the copper bend can be inserted into the straight pipe section. The end face of the straight pipe section is flame-brazed to the outer wall of the copper bend to connect the copper bend and the straight pipe section.

4. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The openings of the two exhaust bends face the same direction and are on the same plane, and the copper pipe section or copper-plated section of the two exhaust bends are of the same length.

5. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The intake pipe includes an integrally formed iron pipe with a welded boss on the outer wall, and a copper pipe with a wide diameter section and a narrow diameter section. The narrow diameter section of the copper pipe is inserted into the iron pipe and the wide diameter section of the copper pipe is located on the upper side of the end of the iron pipe. There is a welding space between the wide diameter section of the copper pipe and the end of the iron pipe. The welding space is used for welding operations to achieve a fixed connection between the copper pipe and the iron pipe.

6. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The conical section and cylindrical neck of the cylinder are made by integral spinning process, while the middle cylinder, the flat bottom with rounded corners, and the external boss with an air outlet are made by stretching and stamping process to reduce welding joints.

7. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The cylinder is equipped with a middle plate, which has two clearance holes corresponding to the air outlets. The pipe sections of the two air outlet bends located inside the cylinder pass through the two clearance holes respectively.

8. The dual-pipe liquid receiver for an air conditioning compressor according to claim 7, characterized in that, The cylinder is also equipped with a filter screen, which is parallel to the middle plate, with one side close to the air inlet pipe and the other side close to the air outlet bend pipe located at the opening of the pipe section inside the cylinder.

9. The dual-pipe liquid receiver for an air conditioning compressor according to claim 8, characterized in that, The outer side of the cylinder is provided with grooves that are recessed towards the inside of the cylinder, corresponding to the outer side of the middle plate and the filter screen, and a limiting protrusion is formed inside the cylinder to limit the middle plate and the filter screen.

10. The dual-pipe liquid receiver for an air conditioning compressor according to claim 1, characterized in that, The welding boss includes a cylindrical lap joint with a diameter equal to the small end diameter of the conical outer boss, and a large truncated cone, a cylindrical truncated cone, and a small truncated cone with successively decreasing diameters on the lower side of the lap joint. This ensures the parallelism between the air inlet pipe and the air outlet bend and the cylinder axis when they are inserted into the cylinder and ensures complete contact of the welding parts, thereby improving the welding quality and strength of the resistance welding.

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