A mounting method of a compressor suction pipe connecting pipe, a compressor and an air conditioning system

Abstract

This invention provides a method for installing a compressor intake pipe connecting pipe, a compressor, and an air conditioning system. The method includes inserting the first end of the intake pipe into the compressor cylinder intake port with a clearance fit until the stepped structure on the outer circumferential surface of the intake pipe axially abuts against the outer surface of the cylinder. A flaring tool is then inserted into the first end, and its working part is driven to open radially outward along the intake pipe, applying a pure radial expansion force to the inner wall of the first end, forcing radial plastic expansion until the outer circumferential surface of the first end tightly adheres to the inner wall of the intake port, forming an interference fit. The flaring tool is then removed, and the end of the external pipe fitting is welded and fixed to the second end of the intake pipe located outside the cylinder. This invention eliminates the axial thrust and lateral shear force applied to the cylinder from the assembly source, avoiding microscopic tilting of the cylinder and eccentric displacement of the stator and rotor, thus ensuring the coaxiality and mechanical durability of the compressor during long-term operation.

Description

Technical Field

[0001] This invention relates to the field of compressor manufacturing and assembly technology, specifically to a method for installing a compressor intake pipe connecting pipe, a compressor, and an air conditioning system. Background Technology

[0002] In the current compressor manufacturing process, the assembly between the intake connecting pipe and the cylinder's suction port generally employs a hydrostatic assembly process. For example... Figure 1 The diagram shown illustrates the static pressure assembly stress of the compressor intake pipe. In the manufacturing process of existing compressors, such as... Figure 1 As shown, the assembly between the copper tube and bushing assembly 40 and the cylinder intake port 31 generally adopts a hydrostatic assembly process. This process involves forcibly pressing the intake connecting pipe, whose outer diameter is larger than the inner diameter of the intake port 31, directly along the axial direction of the intake port 31 to form a physical interference fit.

[0003] Because the entire pressing process needs to overcome the interference friction between the outer wall of the fitting and the inner wall of the intake port 31, the cylinder base 30 inevitably bears a unidirectional assembly load during the assembly process, such as the 3KN pressing force when pressing in the copper tube and bushing assembly 40. This unidirectional forced force will exert a lateral shear moment on the cylinder base 30. Although the cylinder base 30 is assembled and fixed by fastening bolts 32, under the action of lateral thrust, especially in twin-cylinder models with long crankshaft torque, it is easy for the cylinder base 30 to undergo micro-tilt after hydrostatic assembly. The structural tilt of the cylinder base 30 will directly destroy the initial assembly coaxiality between it and the stator 20 and rotor 10 assembly inside the housing. During the later operation of the equipment, the long-term accumulated lateral residual stress will further induce chronic force displacement of the cylinder, eventually causing abnormal eccentricity between the stator and rotor inside the compressor, forming a situation like Figure 1 The relative tilt shown leads to serious mechanical quality problems such as rotor 10 rubbing and uneven wear damage to moving parts.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] To address the problems in the prior art, the present invention aims to provide an installation method for a compressor intake pipe connecting pipe, a compressor, and an air conditioning system, in order to solve the technical problem that the cylinder is subjected to lateral shear stress due to the application of a huge axial pressing force in the static pressure assembly process of the existing compressor intake pipe, which in turn causes microscopic tilting and stator-rotor eccentric displacement after cylinder assembly.

[0006] This invention provides a method for installing a compressor intake connection pipe, the method comprising the following steps: Insert the first end of the intake connection pipe into the intake port of the compressor cylinder, so that the outer peripheral surface of the first end and the inner wall of the intake port are in clearance fit until the stepped structure on the outer peripheral surface of the intake connection pipe abuts against the outer surface of the cylinder along the axis. Insert the flaring tool into the interior of the first end, and drive the working part of the flaring tool to open outward along the radial direction of the air intake connection pipe, so as to apply a radial expansion force to the inner wall of the first end, forcing the first end to undergo radial plastic expansion until the outer peripheral surface of the first end is tightly attached to the inner wall of the air intake and forms an interference fit. Remove the flaring tooling and weld the end of the external pipe to the second end of the intake connection pipe located outside the cylinder.

[0007] In some alternative embodiments, the flaring fixture includes a central conical extrusion head and a plurality of segmented flaring heads circumferentially distributed around the central conical extrusion head; The step of driving the flaring tool to open outward along the radial direction of the air inlet connecting pipe specifically includes: driving the central conical extrusion head to generate axial displacement, using the conical surface to force multiple segmented flaring heads to open outward in the radial direction simultaneously, and converting the axial driving force of the central conical extrusion head into a radial expansion force that acts directly on the inner wall of the first end.

[0008] In some optional embodiments, the step of applying a radial expansion force to the inner wall of the first end, forcing the first end to undergo radial plastic expansion, specifically includes: Control the opening stroke of the flaring tool so that the outer diameter expansion of the first end reaches the sum of the preset target interference and the material elastic rebound compensation. After the outer diameter expansion is reached, the expansion force is maintained to keep the pressure so that the stress at the first end can be relaxed. After the expansion force is removed, the first end undergoes local elastic contraction and rebound, forming a stable interference fit with the inner wall of the intake port.

[0009] In some alternative embodiments, during the step of controlling the opening stroke of the flaring tool, the outer diameter expansion of the first end is set to between 0.2 mm and 1.0 mm.

[0010] In some alternative embodiments, the inner wall of the intake port is machined to have a surface roughness Rz between 3.0 μm and 7.0 μm before the first end is inserted into the intake port. During the radial plastic expansion at the first end, the outer peripheral material of the first end undergoes local yielding under the compression of the expansion force and is embedded radially into the micro-peak and valley profile of the inner wall of the intake port, forming a micro-mechanical interlocking structure between the intake connecting pipe and the intake port.

[0011] In some alternative embodiments, the intake connection pipe is located between the interference fit area of ​​the second end and the first end, and is formed with a heat-insulating section extending axially. In the step of welding and fixing the external fitting to the second end, the welding heating area is limited to the second end so that the temperature of the interference fit area is kept below the annealing temperature of the inlet connection pipe material.

[0012] In some optional embodiments, the intake connection pipe is constructed as an integrally formed reducer, including a small diameter section forming a first end and a large diameter section forming a second end, and the stepped structure is an annular transition end face connecting the small diameter section and the large diameter section. In the step after removing the flaring tool, the end of the external pipe fitting is inserted into the internal cavity of the large-diameter section, and the insertion joint is welded and fixed.

[0013] This invention also provides a compressor, including a cylinder and an intake connection pipe installed at the cylinder's intake port; The intake connection pipe includes a first end located inside the intake port and a second end exposed outside the cylinder. The outer peripheral surface of the intake connection pipe is provided with a stepped structure, and the stepped structure abuts against the outer surface of the cylinder along the axial direction. The internal cavity at the first end of the intake connection pipe is a plastic flared shape that expands outward in a radial direction. The outer peripheral surface of the first end is in close contact with the inner wall of the intake port to form an interference fit surface. The end of the external fitting is inserted into the second end of the air inlet connection pipe and is fixedly connected to the second end through a welded layer.

[0014] In some alternative embodiments, the intake connection pipe is made of copper; The surface roughness Rz of the inner wall of the intake port is between 3.0μm and 7.0μm. The copper material on the outer circumference of the first end of the intake connection pipe undergoes plastic flow due to the internal radial expansion force, and fills the micro-peaks and valleys of the cast iron surface of the inner wall of the intake port radially, forming a micro-mechanical interlocking interface of dissimilar metals.

[0015] This invention provides an air conditioning system, including a compressor as described above.

[0016] The compressor intake pipe connection pipe installation method, compressor, and air conditioning system provided by this invention have the following advantages: This invention alters the direction of force during the assembly process of the pipe fitting and the base, ensuring that the assembly force exists only within the pipe fitting and is transformed into its own plastic deformation. This eliminates the axial thrust and lateral shear force applied to the compressor cylinder from the assembly stage. This method prevents the compressor body from experiencing microscopic tilting or spatial displacement due to external forced assembly stress, ensuring the accuracy and structural stability of the initial assembly clearance between the stator and rotor inside the compressor. While establishing a robust interference fit between the pipe fitting and the base, it also eliminates the potential release of residual lateral stress during later compressor operation, guaranteeing the long-term coaxiality and mechanical durability of the compressor. Attached Figure Description

[0017] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the static pressure assembly of the compressor intake connection pipe; Figure 2 This is a flowchart of the installation method of the compressor intake pipe connecting pipe provided in an embodiment of the present invention; Figure 3 This is a cross-sectional view of the intake connection pipe provided in an embodiment of the present invention when it is radially expanded by inserting a flaring tool. Figure 4 This is a schematic diagram of the cross-sectional structure of the flaring tool provided in the embodiment of the present invention in its initial closed state; Figure 5 This is a schematic diagram of the cross-sectional structure of the flaring tool provided in the embodiment of the present invention in the radially open state. Detailed Implementation

[0019] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The words “or” and “or” in the specification may mean “and” or “or”. Although terms such as “above,” “below,” and “between” may be used in this specification to describe different exemplary features and elements of the invention, these are used herein only for convenience, such as according to the orientation of the examples in the drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the invention. Although terms such as “first” or “second” are used in this specification to denote certain features, they are merely indicative of function and not as a limitation on the number or importance of specific features.

[0020] In order to define the relative structure and motion relationships of each component without being in absolute three-dimensional space, this application uniformly defines the following local spatial references: axial or longitudinal, is the direction determined with reference to the extension direction of the geometric center axis of the intake connection pipe 200 or the intake port 111 of the cylinder 110; radial or transverse, refers to the direction perpendicular to the central axis; circumferential, refers to the circumferential direction around the central axis; inner and outer, unless otherwise specified, are the relative positions with respect to the geometric axis of each tubular component or cavity component.

[0021] like Figures 2 to 5 As shown, this embodiment of the invention provides a method for installing a compressor intake connecting pipe and a compressor. In specific implementation, the intake connecting pipe 200 is constructed as a reducer, including a small-diameter section forming a first end 210 and a large-diameter section forming a second end 220. The stepped structure 230 is an annular transition end face connecting the small-diameter section and the large-diameter section. The flaring fixture 500 includes a central conical extrusion head 511 and a plurality of segmented flaring heads 512 circumferentially distributed around the central conical extrusion head 511.

[0022] like Figure 2 As shown, the installation method of the compressor intake connection pipe includes the following steps: S100, combined Figure 3 As shown, the first end 210 of the intake connecting pipe 200 is inserted into the intake port 111 of the compressor cylinder 110, so that the outer peripheral surface of the first end 210 and the inner wall of the intake port 111 maintain a clearance fit until the stepped structure 230 on the outer peripheral surface of the intake connecting pipe 200 rigidly abuts against the outer surface of the cylinder 110, that is, the base plane outside the intake port 111. As a preferred embodiment, a radial assembly gap of 0.05mm to 0.15mm is reserved between the initial outer diameter of the first end 210 and the initial inner diameter of the intake port 111 to ensure that the intake connecting pipe 200 can smoothly slide into the intake port 111 with only a small thrust without any axial hammering or mechanical static pressure. The pre-designed micro-gap fit and stepped positioning assembly method ensures that no axial pressing force or lateral shear force that would cause deformation is applied to the cylinder 110 during the initial positioning stage, while also ensuring the absolute axial depth and coaxiality of the intake connection pipe 200 entering the cylinder.

[0023] S200, the flaring tool 500 is inserted into the interior of the first end 210, and the working part 510 of the flaring tool 500 is driven to open outward along the radial direction of the air intake connection pipe 200, so as to apply a radial expansion force to the inner wall of the first end 210, forcing the first end 210 to undergo radial plastic expansion until the outer peripheral surface of the first end 210 is tightly attached to the inner wall of the air intake port 111 and forms an interference fit.

[0024] In this stage, the step of the working part 510 of the driving flaring tool 500 opening outward along the radial direction of the air intake connection pipe 200 specifically includes: S210, combined Figure 4 and Figure 5 As shown, during initial insertion, the flared fixture 500 is in the position as follows: Figure 3 The closed state shown ensures a clearance fit; subsequently, the drive center conical extrusion head 511 generates axial displacement, using the conical surface fit to force multiple segmented expansion heads 512 to synchronously expand radially outwards as shown. Figure 4 The radially open state shown converts the axial driving force of the central conical extrusion head 511 into a pure radial expansion force that acts directly on the inner wall of the first end 210.

[0025] In a preferred embodiment, the effective axial length of the working portion 510 of the flaring fixture 500 is configured to penetrate and cover the entire intake connection pipe 200. During the radially outward flaring step, the flaring fixture 500 can globally flare the entire intake connection pipe 200, including both the first end 210 and the second end 220. This global flaring method, on the one hand, forces the first end 210, located inside the intake port 111, to undergo radial plastic expansion to achieve the aforementioned interference fit; on the other hand, it also causes the second end 220, exposed outside the cylinder 110, to simultaneously undergo radial outward expansion, thereby naturally enlarging the diameter of the internal cavity of the second end 220, providing more ample assembly clearance for the smooth insertion and socket welding of external pipe fittings such as the intake bend in the subsequent step S300. The necessary action to eliminate the lateral shear force of the cylinder in this embodiment is the radial expansion of the first end 210; whether or not the entire intake connection pipe 200 is flared does not constitute a limitation on this embodiment of the invention.

[0026] S300, remove the flaring tool 500 and weld the end of the external pipe fitting to the second end 220 of the intake connection pipe 200 located outside the cylinder 110. Specifically, in the step after removing the flaring tool 500, insert the end of the external pipe fitting into the inner cavity of the large-diameter section of the second end 220 of the intake connection pipe 200, weld the insertion joint, and form a weld layer on the periphery.

[0027] In some embodiments, to overcome the springback effect during the cold working of metal and ensure assembly dimensional accuracy, the step of applying a radial expansion force to the inner wall of the first end 210 to force the first end 210 to undergo radial plastic expansion specifically includes: S211. Control the opening stroke of the flaring fixture 500 so that the outer diameter expansion of the first end 210 reaches the sum of the preset target interference and the material elastic rebound compensation. In this embodiment, the preset target interference refers to the set difference between the outer diameter of the first end 210 of the intake connecting pipe 200 and the inner diameter of the intake port 111 when the flaring fixture 500 is removed and the first end 210 is in the final static assembly state. This difference is used to provide the radial contact clamping force required for the long-term operation of the compressor. The material elastic rebound compensation refers to the radial shrinkage of the outer diameter of the intake connecting pipe 200 (if it is made of copper) due to elastic recovery when the radial expansion force is removed and the copper material changes from an elastic-plastic deformation state to a residual plastic deformation state. Since copper has inherent elastic recovery characteristics after yielding, the mechanical opening stroke of the flaring fixture 500 must cover this shrinkage for excessive expansion to ensure that the final physical size after rebound is equal to the target interference.

[0028] S212. After the outer diameter expansion is reached, the expansion force is maintained to keep the pressure so that the first end 210 will experience stress relaxation. S213. After the expansion force is removed, the first end 210 undergoes local elastic contraction and rebound, forming a stable interference fit with the inner wall of the intake port 111.

[0029] The pressure holding action induces lattice dislocations and stress relaxation in the plastic deformation zone, thereby offsetting the interference reduction caused by local elastic contraction and springback after simple mechanical expansion and ensuring the long-term physical locking reliability of the interference fit.

[0030] In a further embodiment, in the step of controlling the opening stroke of the flaring fixture 500, the outer diameter expansion amount of the first end 210 is set to... to Between, and the magnitude of the expansion force is set to In a preferred embodiment, when the wall thickness of the intake connection pipe 200 is... At that time, the outer diameter expansion amount is set as and apply The pure radial expansion force. The process parameter configuration in this embodiment achieves the reversal of the assembly force model. Compared with the existing hydrostatic assembly process, which requires overcoming surface friction... to (about to The axial pressing force of ) in this embodiment The fluid expansion force is only approximately equivalent to The mechanical force. This application reduces the absolute force required for assembly by an order of magnitude, and the The force acting as a pure radial radiation load has zero mechanical components in the axial and lateral directions. This parameter ensures that the material at the first end 210 crosses the yield limit and enters the plastic deformation stage, while with a low internal load of less than one-tenth of that in traditional processes, there is no need to apply lateral shear force to the cylinder 110 base, thus eliminating the hidden dangers of cylinder base tilting and stator / rotor eccentricity loss from the source of the process physics.

[0031] In some embodiments, the inner wall of the intake port 111 is machined to reduce its surface roughness before the first end 210 of the intake connection pipe 200 is inserted into the intake port 111. Between to During the radial plastic expansion of the first end 210, the outer peripheral material of the first end 210 locally yields under the compression of the expansion force and embeds itself radially into the microscopic peak-valve contour of the inner wall of the intake port 111, forming a microscopic mechanical interlocking structure between the intake connecting pipe 200 and the intake port 111. This microscopic interference-fitting mechanism utilizes the interfacial penetration and filling effect of soft metal materials, replacing the mechanical scraping associated with macroscopic axial pressing, and significantly improving the tensile and torsional shear limits of the bonding interface.

[0032] In some embodiments, the intake connecting pipe 200 is located between the interference fit area of ​​the second end 220 and the first end 210, and is formed with an axially extending thermal insulation section. The thermal insulation section refers to a section of exposed pipe wall of the intake connecting pipe 200, for example, a copper pipe body, located outside the cylinder 110 and not encased in external pipe fittings, with a specific axial length. The axial length of this exposed pipe wall is predetermined based on the thermal conductivity of the copper material and the amount of welding heat input, so as to form a heat conduction impedance path using natural air convection or forced cooling. In the step of welding and fixing the external pipe fitting to the second end 220 of the intake connecting pipe 200, the welding heating area is confined to the second end 220 of the intake connecting pipe 200. The physical axial spacing of the aforementioned thermal insulation section cuts off the conduction of the high welding temperature to the interior of the cylinder 110, so that the maximum temperature of the interference fit area is strictly maintained below the recrystallization annealing temperature of the copper material of the intake connecting pipe 200. The spatial arrangement utilizes the physical axial spacing of the thermal isolation section to construct a thermal conduction impedance path, cutting off the conduction of high welding temperature to the inside of cylinder 110, preventing the contact stress thermal attenuation caused by dislocation recovery and recrystallization inside the metal at the first end 210 due to high temperature, and ensuring the long-term sealing stability of the micro-mechanical interlocking structure.

[0033] This invention also provides an air conditioning system, including a compressor of any of the above embodiments, and uses the compressor intake connection pipe installation method of any of the above embodiments to complete the assembly between the intake connection pipe 200 and the cylinder intake port 111. The compressor includes a cylinder 110 and an intake connection pipe 200 installed at the intake port 111 of the cylinder 110. The intake connection pipe 200 includes a first end 210 located inside the intake port 111 and a second end 220 exposed outside the cylinder 110. The outer peripheral surface of the intake connection pipe 200 is provided with a stepped structure 230, which abuts against the outer surface of the cylinder 110 axially. The internal cavity of the first end 210 of the intake connection pipe 200 is a plastic flared shape that expands radially outward. The outer peripheral surface of the first end 210 of the intake connection pipe 200 is tightly fitted with the inner wall of the intake port 111 to form an interference fit surface. The end of the external pipe is inserted into the second end 220 of the intake connection pipe 200 and is fixedly connected to the second end 220 of the intake connection pipe 200 through a weld layer. Specifically, the internal cavity of the first end 210 of the intake connecting pipe 200 is a plastic flared shape that expands outward in the radial direction. This means that after static assembly, due to the internal expansion of the flaring tool 500, the inner diameter of the interference fit area of ​​the first end 210 is permanently physically enlarged. The actual inner diameter at this location is objectively larger than the initial inner diameter of the adjacent pipe section of the intake connecting pipe 200 that is not subjected to the flaring force, thereby forming a stepped or micro-trumpet-shaped plastic deformation profile in the internal cavity 213 that is visible to the naked eye or measurable by calipers.

[0034] In some embodiments, the micro-interface is formed by the combination of dissimilar metals. For example, the cylinder 110 is made of cast iron, and the intake connecting pipe 200 is made of copper. Before inserting the first end 210 into the intake port 111, the inner wall 112 of the intake port 111 is machined to reduce its surface roughness. Between to Between. The micro-peak and valley profile refers to the micro-uneven structure on the surface of the inner wall 112 of the intake port 111 made of cast iron after machining, which is inevitably composed of alternating raised metal micro-peaks and recessed micro-valleys in its micro-geometry. Specifically, during the radial plastic expansion process of the first end 210, the copper material of the outer peripheral surface 212 of the first end 210 of the intake connecting pipe 200, due to its much lower hardness than cast iron, experiences a continuous pure radial expansion force inside, such as Under compression, the material undergoes solid plastic flow beyond its yield limit. This plastically flowing copper material is forcibly filled radially into and saturates the recessed area of ​​the microscopic peak-valley profile 114 on the cast iron surface of the inner wall 112 of the intake port 111.

[0035] After this plastic filling is completed, the harder cast iron micro-peaks embed into the softer copper matrix, and the softer copper protrusions fill the micro-valves of the cast iron. The two are interlocked at the micro-interface, thus forming a micro-mechanical interlocking interface or micro-mechanical interlocking structure of dissimilar metals between the intake connecting pipe 200 and the intake port 111. This micro-mechanical interlocking structure defines the material penetration and interlocking state between dissimilar metals, completely changing the traditional frictional contact mode in which the macroscopic smooth cylindrical surface relies solely on the coefficient of friction and normal pressure to maintain the connection. This means that when the interface between the pipe and the cylinder is subjected to axial pull-out force or circumferential torque, it must additionally overcome the shear yield strength of the embedded metal, thus providing a very clear physical basis for solid pull-out resistance and torsional resistance, improving the long-term sealing reliability of the compressor under alternating load conditions.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for installing a compressor intake connecting pipe, characterized in that, The installation method includes the following steps: Insert the first end of the intake connection pipe into the intake port of the compressor cylinder, so that the outer peripheral surface of the first end and the inner wall of the intake port are in clearance fit until the stepped structure on the outer peripheral surface of the intake connection pipe abuts against the outer surface of the cylinder along the axial direction. Insert the flaring tool into the interior of the first end, and drive the working part of the flaring tool to open outward along the radial direction of the air inlet connecting pipe, so as to apply a radial expansion force to the inner wall of the first end, forcing the first end to undergo radial plastic expansion until the outer peripheral surface of the first end is tightly attached to the inner wall of the air inlet and forms an interference fit. Remove the flaring tool and weld the end of the external pipe to the second end of the air intake connection pipe located outside the cylinder.

2. The installation method of the compressor intake connecting pipe according to claim 1, characterized in that, The flaring fixture includes a central conical extrusion head and multiple segmented flaring heads circumferentially distributed around the central conical extrusion head; The step of driving the working part of the flaring tool to open outward along the radial direction of the air inlet connecting pipe specifically includes: driving the central conical extrusion head to generate axial displacement, using the conical surface to force multiple segmented expansion heads to open outward in the radial direction simultaneously, and converting the axial driving force of the central conical extrusion head into the radial expansion force that directly acts on the inner wall of the first end.

3. The installation method of the compressor intake connecting pipe according to claim 1, characterized in that, The step of applying a radial expansion force to the inner wall of the first end, forcing the first end to undergo radial plastic expansion, specifically includes: Control the opening stroke of the flaring tool so that the outer diameter expansion of the first end reaches the sum of the preset target interference and the material elastic rebound compensation. After the outer diameter expansion is reached, the expansion force is maintained to keep the pressure so that the first end can relax the stress. After the expansion force is removed, the first end undergoes local elastic contraction and rebound, forming a stable interference fit with the inner wall of the air intake.

4. The method for installing the compressor intake connecting pipe according to claim 3, characterized in that, In the step of controlling the opening stroke of the flaring tool, the outer diameter expansion of the first end is set to be between 0.2 mm and 1.0 mm.

5. The method for installing the compressor intake connecting pipe according to claim 1, characterized in that, Before inserting the first end into the air intake, the inner wall of the air intake is machined so that its surface roughness Rz is between 3.0 μm and 7.0 μm; During the radial plastic expansion of the first end, the outer peripheral material of the first end partially yields under the compression of the expansion force and is embedded radially into the micro-peak and valley profile of the inner wall of the air intake, forming a micro-mechanical interlocking structure between the air intake connection pipe and the air intake.

6. The method for installing the compressor intake connecting pipe according to claim 1, characterized in that, The intake connection pipe is located between the interference fit area of ​​the second end and the first end, and is formed with a heat insulation section extending along the axial direction; In the step of welding and fixing the external pipe to the second end, the welding heating area is limited to the second end so that the temperature of the interference fit area is kept below the annealing temperature of the air inlet connection pipe material.

7. The method for installing the compressor intake connecting pipe according to claim 1, characterized in that, The intake connection pipe is constructed as an integrally formed reducer, including a small diameter section forming the first end and a large diameter section forming the second end, and the stepped structure is an annular transition end face connecting the small diameter section and the large diameter section. In the step after removing the flaring tool, the end of the external pipe is inserted into the internal cavity of the large-diameter section, and the insertion joint is welded and fixed.

8. A compressor, characterized in that, Includes a cylinder and an air intake connection pipe installed at the air intake port of the cylinder; The intake connection pipe includes a first end located inside the intake port and a second end exposed outside the cylinder. The outer peripheral surface of the intake connection pipe is provided with a stepped structure, and the stepped structure abuts against the outer surface of the cylinder along the axial direction. The internal cavity of the first end of the air intake connection pipe is a plastic flared shape that expands outward in a radial direction, and the outer peripheral surface of the first end is closely attached to the inner wall of the air intake to form an interference fit surface. The end of the external fitting is inserted into the second end of the air inlet connection pipe and is fixedly connected to the second end through a welded layer.

9. The compressor according to claim 8, characterized in that, The cylinder is made of cast iron, and the intake connection pipe is made of copper. The surface roughness Rz of the inner wall of the air intake is between 3.0 μm and 7.0 μm. The copper material on the outer circumference of the first end of the air intake connection pipe undergoes plastic flow due to internal radial expansion force, and fills the micro-peaks and valleys of the cast iron surface of the inner wall of the air intake radially, forming a micro-mechanical interlocking interface of dissimilar metals.

10. An air conditioning system, characterized in that, Includes the compressor as described in claim 8 or 9.

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