Compressor and assembling method thereof

Abstract

The invention discloses a compressor and an assembling method thereof, and belongs to the technical field of compressor assembly.The compressor comprises a pump body with a rack, a motor and a shell, the rack protrudes out of the outer edge of a cylinder cover of the pump body, and the assembling method of the compressor comprises the following steps that the motor is assembled on the pump body; the motor and the rack are fixed to form a pump body motor assembly; the pump body motor assembly is placed in the shell, and the rack is in clearance fit with the shell; the grooves in the peripheral wall of the rack and the protrusions on the inner wall of the shell are aligned, so that the protrusions on the inner wall of the shell are arranged in the grooves in the peripheral wall of the rack, the protrusions at least bear the tops of the grooves, and the relative positions of the shell and the rack are fixed; and an air inlet connecting pipe is pressed into an air cylinder air inlet hole of the pump body. The rack and the shell are in clearance fit, and the protrusions and the grooves are matched with each other, so that the position of the rack in the shell is fixed, the assembly precision is improved, and the assembly error is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compressor assembly, and in particular to a compressor and an assembly method thereof. Background Art

[0002] At present, the traditional way of assembling and fixing the pump motor assembly is to directly insert the rotor jacket clearance gauge on the pump body into the inner diameter of the stator, so that the axial position of the pump body can be fine-tuned and the pump body can rotate circumferentially to ensure that the cylinder air inlet hole and the housing seat ring hole are in the same position.

[0003] However, for compressors with powder metallurgy frame structures, since powder metallurgy cannot be welded using traditional methods, the conventional method is to use a shrink fit process to fix the outer shell and the pump body. The main assembly principle is to expand the outer shell by heating, then insert the stator into it, and finally cool and shrink the outer shell to achieve an interference fit with the stator.

[0004] In the compressor with powder metallurgy frame structure, such as Figure 1-Figure 3 As shown, the relative positions of the cylinder air inlet hole 4 of the pump body 3 and the frame 2 are fixed. When performing the shrink fitting process, the relative positions of the cylinder air inlet hole 4 and the seat ring hole of the shell 1 need to be ensured, and the position fine-tuning needs to be completed before the shell 1 is cooled. After the shell 1 is cooled, if the position deviation between the cylinder air inlet hole 4 and the seat ring hole of the shell 1 is large, it will directly lead to the scrapping of the product. The shrink fitting process for the shell 1 requires high precision, which is more difficult than the traditional structure. Summary of the invention

[0005] The object of the present invention is to provide a compressor and an assembly method thereof, so as to solve the problem that it is difficult to assemble a pump motor assembly in a compressor with a powder metallurgy frame structure.

[0006] To solve the above technical problems, the first aspect of the present invention provides a method for assembling a compressor, the compressor comprising a pump body with a frame, a motor and a casing, the frame protruding from the outer edge of the cylinder cover of the pump body, comprising the following steps: assembling the motor on the pump body, the motor and the frame being fixed to form a pump body motor assembly; placing the pump body motor assembly into the casing, the frame and the casing being gap-matched; aligning the groove on the outer peripheral wall of the frame with the protrusion on the inner wall of the casing, so that the protrusion on the inner wall of the casing is arranged in the groove on the outer peripheral wall of the frame, and the protrusion at least supports the groove top of the groove to fix the relative position of the casing and the frame; pressing the intake connecting pipe into the cylinder intake hole of the pump body.

[0007] Preferably, before the frame is installed in the shell, the protrusion is formed on the inner wall of the shell.

[0008] Preferably, the groove extends out of the lower end surface of the frame to form an opening; the step of arranging the protrusion in the groove includes: allowing the protrusion to enter the opening at the lower end surface of the frame and slide into the groove along the extension direction of the groove.

[0009] Preferably, the groove is configured as a rotation groove, and during assembly, the protrusion is made to enter from the opening at the lower end surface of the frame, and the protrusion is rotated to enter the groove.

[0010] Preferably, the stator unit of the motor is placed in the frame and is interference-fitted with the frame, and the rotor unit of the motor is interference-fitted with the crankshaft of the pump body.

[0011] A second aspect of the present invention provides a compressor, comprising a pump body with a frame, a motor and a casing, wherein the frame is arranged to protrude from the outer edge of the cylinder cover of the pump body, the motor is fixed on the frame, a groove is arranged on the outer peripheral wall of the frame, a protrusion is arranged on the inner wall of the casing, the frame and the casing are clearance-matched, the protrusion is arranged in the groove, and the protrusion at least supports the groove top of the groove.

[0012] Preferably, a plurality of the grooves are provided and are evenly arranged circumferentially on the outer circumferential surface of the frame.

[0013] Preferably, the groove extends out of the lower end surface of the frame to form an opening.

[0014] Preferably, the groove is configured as a straight groove or a rotation groove.

[0015] Preferably, the groove top of the groove is a curved surface, and the protrusion fits closely with the groove top.

[0016] In the compressor and the assembly method thereof provided by the present invention, the frame and the shell are clearance-fitted, and the protrusions and the grooves cooperate with each other, so as to fix the position of the frame in the shell, facilitate controlling the relative position between the frame and the shell, help improve assembly accuracy, and reduce assembly errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a pump body and a frame in the prior art;

[0018] Figure 2 It is a structural schematic diagram of a housing in the prior art;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the housing and the frame after assembly in the prior art;

[0020] Figure 4 is a schematic structural diagram of a pump motor assembly in one embodiment of the present invention;

[0021] Figure 5 is a schematic structural diagram of another pump motor assembly in one embodiment of the present invention;

[0022] Figure 6 is a schematic structural diagram of a housing in one embodiment of the present invention;

[0023] Figure 7 It is a schematic cross-sectional structure diagram of the assembled housing and pump motor assembly in one embodiment of the present invention;

[0024] Figure 8 is a schematic structural diagram of a pump motor assembly in another embodiment of the present invention;

[0025] Fig. 9 It is a schematic cross-sectional structure diagram of the assembled housing and pump motor assembly in another embodiment of the present invention.

[0026] Figure 1-Figure 3 middle:

[0027] 1. Casing; 2. Frame; 3. Pump body; 31. Rotor; 32. Stator; 4. Cylinder air inlet hole.

[0028] Figure 4-Figure 9 middle:

[0029] 10. Pump body motor assembly; 11. Stator unit; 12. Rotor unit; 13. Frame; 14. Groove; 15. Pump body; 20. Casing; 30. Protrusion; 40. Base; 50. Cylinder air inlet hole. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the compressor and the assembly method thereof proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0031] The inventors have found that traditional welding methods cannot be used for the frame made by powder metallurgy. Generally, the frame and the shell are fixed by the shrink fitting process. The frame and the shell need to be aligned during assembly, and the cylinder air inlet hole and the shell seat ring hole need to be fine-tuned to the correct position before the shell cools. The shrink fitting process is difficult to assemble.

[0032] Based on this, the core idea of ​​the present invention is to facilitate the control of the relative position between the frame and the shell and reduce the difficulty of assembly by making clearance fit between the frame and the shell and fixing the position of the frame in the shell through the mutual fit between the protrusion and the groove.

[0033] For details, please refer to Figure 4-Figure 9, which is a schematic diagram of an embodiment of the present invention. A method for assembling a compressor, the compressor comprising a pump body 15 with a frame 13, a motor and a housing 20, the frame 13 protruding from the outer edge of the cylinder head of the pump body 15, comprising the following steps: assembling the motor on the pump body 15, the motor and the frame 13 being fixed to form a pump body motor assembly 10; placing the pump body motor assembly 10 into the housing 20, with the frame 13 and the housing 20 being clearance-matched; aligning the groove 14 on the outer peripheral wall of the frame 13 with the protrusion 30 on the inner wall of the housing 20, so that the protrusion 30 on the inner wall of the housing 20 is arranged in the groove 14 on the outer peripheral wall of the frame 13, and the protrusion 30 at least supports the groove top of the groove 14 to fix the relative position of the housing 20 and the frame 13; pressing an intake connecting pipe (not marked) into the cylinder intake hole 50 of the pump body 15.

[0034] The frame 13 and the shell 20 are aligned, and the frame 13 is installed in the shell 20 through clearance fit, so that the protrusion 30 on the inner wall of the shell 20 is arranged in the groove 14 on the outer wall of the frame 13, so as to fix the relative positions of the shell 20 and the frame 13. The clearance between the frame 13 and the shell 20 is matched, and the relative position between the frame 13 and the shell 20 is fixed by the alignment of the protrusion 30 and the groove 14. The protrusion 30 can be pre-set according to the relative position of the shell 20 and the frame 13 to be assembled. Therefore, ensuring the relative position of the protrusion 30 and the groove 14 can ensure that the cylinder air inlet 50 is in the correct position; the protrusion 30 can also be formed after the frame 13 is assembled into the shell 20 and fine-tuned, which is convenient for adjusting the position of the frame 13. The structure of the protrusion 30 and the groove 14 helps to ensure the assembly accuracy of the frame 13 and the shell 20, and the protrusion 30 supports the groove top of the groove 14, plays the role of supporting the shell 20, ensures the stability of the position of the shell 20, and greatly reduces the difficulty of work. The frame 13 can be formed by powder metallurgy, or formed using materials such as cast iron and forged steel.

[0035] In one embodiment, if Figure 4-Figure 7 Before the frame 13 is installed in the housing 20, the protrusion 30 is formed on the inner wall of the housing 20. The groove 14 extends out of the lower end surface of the frame 13 to form an opening (not marked). The step of setting the protrusion 30 in the groove 14 includes: allowing the protrusion 30 to enter from the opening at the lower end surface of the frame 13 and slide into the groove 14 along the extension direction of the groove 14.

[0036] like Figure 4As shown, the groove 14 may be a straight groove, which directly extends downward from the lower end surface of the frame 13 along the axial direction of the frame 13 itself, and the center line of the groove 14 is parallel to the axial direction of the frame 13 itself. Figure 5 As shown, the groove 14 is set as a rotation groove. During assembly, the protrusion 30 enters from the opening at the lower end surface of the frame 13 and rotates in the direction opposite to the rotation direction of the rotation groove to enter the groove 14. The groove 14 extends to the lower end surface of the frame 13 in a spiral shape. The rotation groove is a spiral groove set along the outer diameter wall of the frame 13, and its rotation direction is opposite to the rotation direction of the frame 13 during assembly. During assembly, the frame 13 or the housing 20 is rotated to rotate the protrusion 30 into the groove 14.

[0037] The protrusion 30 and the groove 14 are respectively formed on the housing 20 and the frame 13 before assembly. It should be noted that when the protrusion 30 and the groove 14 are relative to each other, the frame 13 is in the correct position and the cylinder air inlet hole 50 can be exposed from the housing 20.

[0038] like Figure 4-Figure 7 As shown, the protrusion 30 is directly formed by stamping, and the frame 13 and the shell 20 are gap-fitted. During assembly, the protrusion 30 on the shell 20 extends from the groove 14 and slides into one end of the lower end surface of the frame 13, so that the relative positions of the two are fixed. Then, the intake connecting pipe (not marked) is pressed into the cylinder intake hole 50. The pump body motor assembly 10 can rely on its own gravity and the connection with the intake connecting pipe to ensure the fixation of its own axial position, while the protrusion 30 on the inner surface of the shell 20 and the groove 14 on the frame 13 are matched to ensure the fixation of its own circumferential position. After completing the assembly between the frame 13 and the shell 20, the shell cover (not marked) and the liquid reservoir (not shown) are welded to complete the assembly of the compressor, forming a structure as shown in FIG. Figure 7 The structure is shown in the cross-sectional view.

[0039] In one embodiment, after the protrusion 30 is arranged in the groove 14, the protrusion 30 is connected to the groove 14 by hot riveting. It can be understood that the protrusion 30 is pre-formed on the housing 20, and after the protrusion 30 is engaged in the groove 14, there may still be a certain gap between the groove 14 and the protrusion 30. The protrusion 30 is further melted and deformed by hot riveting to fill the groove 14, so that the connection between the groove 14 and the protrusion 30 is tighter.

[0040] In another embodiment, if Figure 8-Figure 9 The step of setting the protrusion 30 in the groove 14 includes: melting and deforming the inner wall material of the housing 20 by hot riveting to form the protrusion 30, and filling the protrusion 30 into the groove 14. The shape of the groove 14 is not specifically limited here, and the shape of the groove 14 includes a circle and a polygon. Figure 8The middle groove 14 is circular.

[0041] Due to the clearance fit between the shell 20 and the frame 13, after the frame 13 is assembled into the shell 20, the position of the frame 13 is fine-tuned, the relative positions of the frame 13 and the shell 20 are aligned, the intake connecting pipe is pressed into the cylinder intake hole 50, and hot riveting is performed at the corresponding position of the groove 14 of the frame 13, so that the local material of the shell 20 is melted and deformed to form a protrusion 30 filled in the groove 14, so that the relative position of the pump body motor assembly 10 and the shell 20 is fixed, and the assembly of the compressor is completed after the shell cover and the liquid reservoir are welded.

[0042] In addition, the stator unit 11 of the motor is placed in the frame 13 and is interference fit with the frame 13, and the rotor unit 12 of the motor is interference fit with the crankshaft of the pump body 15. The motor includes a stator unit 11 and a rotor unit 12, and the pump body 15 often includes a crankshaft (not marked) and a cylinder (not marked) and a roller (not marked) at its bottom. The stator unit 11 is located in the frame 13 and is interference fit with the frame 13, and the clearance is ensured by packaging coaxiality accuracy. The rotor unit 12 is fixed with the crankshaft inside it by interference fit, and a plurality of feet 40 are also provided on the outer wall of the housing 20.

[0043] Based on the same technical idea, the present invention also provides a compressor, including a pump body 15 with a frame 13, a motor and a shell 20, wherein the frame 13 is arranged to protrude from the outer edge of the cylinder head of the pump body 15, the motor is fixed on the frame 13, a groove 14 is arranged on the outer peripheral wall of the frame 13, a protrusion 30 is arranged on the inner wall of the shell 20, the frame 13 and the shell 20 are clearance-matched, the protrusion 30 is arranged in the groove 14, the protrusion 30 at least supports the groove top of the groove 14, and the assembly method of the compressor as described above is used during assembly. Among them, the compressor is, for example, a rotor compressor used in a refrigeration system.

[0044] In one embodiment, the grooves 14 are provided in a plurality and are evenly arranged on the outer circumferential surface of the frame 13. The number of the grooves 14 and the protrusions 30 are the same and the positions are corresponding. Three grooves 14 can be provided and arranged in a row circumferentially. The grooves 14 extend out of the lower end surface of the frame 13 to form an opening, so that the protrusions 30 can enter from the opening.

[0045] In addition, the groove 14 is configured as a straight groove or a rotating groove; the protrusion 30 is spherical. The groove 14 can also be configured as an inverted U-shape, or a curve with multiple inflection points, so that the protrusion 30 enters from the opening and goes deeper along the track of the groove 14. The groove top of the groove 14 is an arc surface, and the protrusion 30 fits with the groove top. The protrusion 30 can support the groove top of the groove 14, which helps to keep the relative position between the housing 20 and the pump motor assembly 10 fixed.

[0046] In summary, in the compressor and the assembly method thereof provided in the embodiments of the present invention, the relative fixation of the position between the shell and the frame is ensured by the protrusions and the grooves, and the relative position between the frame and the shell during assembly can be ensured by designing the positions of the protrusions and the grooves to correspond to each other. In addition, due to the clearance fit between the shell and the frame, the position of the frame can be fine-tuned, which greatly reduces the difficulty of assembly.

[0047] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A method for assembling a compressor, the compressor comprising a pump body with a frame, a motor and a housing, the frame protruding from the outer edge of the cylinder cover of the pump body, characterized in that: The following steps are involved: The motor is assembled on the pump body, and the motor is fixed to the frame to form a pump body motor assembly; the pump body motor assembly is placed in the shell, and the frame and the shell are clearance-matched; the groove on the outer peripheral wall of the frame and the protrusion on the inner wall of the shell are aligned, so that the protrusion on the inner wall of the shell is arranged in the groove on the outer peripheral wall of the frame, and the protrusion at least supports the groove top of the groove to fix the relative position of the shell and the frame; and an intake connecting pipe is pressed into the cylinder intake hole of the pump body.

2. The compressor assembly method according to claim 1, characterized in that: Before the frame is installed in the shell, the protrusion is formed on the inner wall of the shell.

3. The compressor assembly method according to claim 2, characterized in that: The groove extends out of the lower end surface of the frame to form an opening; the step of arranging the protrusion in the groove includes: allowing the protrusion to enter the opening at the lower end surface of the frame and slide into the groove along the extension direction of the groove.

4. The method for assembling a compressor according to claim 3, characterized in that: The groove is set as a rotation groove, and during assembly, the protrusion is made to enter from the opening at the lower end surface of the frame, and the protrusion is rotated to enter the groove.

5. The method for assembling a compressor according to claim 1, characterized in that: The stator unit of the motor is placed in the frame and is interference-fitted with the frame, and the rotor unit of the motor is interference-fitted with the crankshaft of the pump body.

6. A compressor, comprising a pump body with a frame, a motor and a housing, wherein the frame protrudes from the outer edge of the cylinder cover of the pump body, and the motor is fixed on the frame, characterized in that: A groove is arranged on the outer peripheral wall of the frame, a protrusion is arranged on the inner wall of the shell, the frame and the shell are clearance-matched, the protrusion is arranged in the groove, and the protrusion at least supports the groove top of the groove. During assembly, the assembly method of the compressor as claimed in claim 1 is used.

7. The compressor according to claim 6, characterized in that A plurality of grooves are provided and are evenly arranged on the outer peripheral surface of the frame in the circumferential direction.

8. The compressor according to claim 6, characterized in that The groove extends out of the lower end surface of the frame to form an opening.

9. The compressor according to claim 8, characterized in that The groove is configured as a straight groove or a rotation groove.

10. The compressor according to claim 6, characterized in that The groove top of the groove is an arc surface, and the protrusion fits with the groove top.

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