Cylinder assembly, its assembly method, and rotary compressor

Abstract

The present invention relates to the technical field of compressors, and provides a cylinder assembly, an assembly method thereof, and a rotary compressor. The cylinder assembly includes: a cylinder and an intermediate plate. Chamfers are respectively provided on the opposite end faces of a pair of refrigerant through holes of the cylinder and the intermediate plate; an annular positioning pin. Bevels adapted to the corresponding chamfers are respectively provided on the outer edges of the two end faces of the annular positioning pin. The annular positioning pin is pressed between the chamfers of the cylinder and the intermediate plate. The through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate, and the two bevels of the annular positioning pin are respectively in contact with the chamfers of the cylinder and the intermediate plate, so that the intermediate plate and the cylinder are coaxially aligned. The present invention utilizes a pair of inherent refrigerant through holes of the cylinder and the intermediate plate, chamfers are provided on the end faces of the refrigerant through holes, and at the same time, an annular positioning pin with bevels adapted to the chamfers is designed. The concentricity between the intermediate plate and the cylinder is accurately ensured by the annular positioning pin, and the refrigerant flow is not affected. The overall structure of the cylinder assembly is simple, the installation is convenient, and the cost is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and more specifically, to a cylinder assembly, an assembly method thereof, and a rotary compressor. Background Art

[0002] During the assembly process of the compressor, it is necessary to control the concentricity between the intermediate plate and the cylinder to avoid the offset of the intermediate plate. Currently, in the form of two traditional positioning pins, when machining the cylinder and the intermediate plate, two positioning holes need to be respectively opened on the cylinder and the intermediate plate for positioning and fixing the two traditional positioning pins. The current method has the following problems:

[0003] It is necessary to additionally open positioning holes on the cylinder and the intermediate plate, which is cumbersome in processing and high in cost;

[0004] The traditional positioning pins cannot accurately ensure the concentricity between the intermediate plate and the cylinder.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present invention, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] In view of this, the present invention provides a cylinder assembly, an assembly method thereof, and a rotary compressor, which can utilize a pair of refrigerant through holes inherent in the cylinder and the intermediate plate, set chamfers on the end faces of the refrigerant through holes, and at the same time design an annular positioning pin with inclined surfaces adapted to the chamfers. The annular positioning pin accurately ensures the concentricity between the intermediate plate and the cylinder without affecting the refrigerant flow. The overall structure of the cylinder assembly is simple, easy to install, and cost-saving.

[0007] According to one aspect of the present invention, there is provided a cylinder assembly, comprising: a cylinder and an intermediate plate, chamfers are respectively provided on the opposite end faces of a pair of refrigerant through holes of the cylinder and the intermediate plate; an annular positioning pin, the outer edges of the two end faces of the annular positioning pin are respectively provided with inclined surfaces adapted to the corresponding chamfers, the annular positioning pin is pressed between the chamfers of the cylinder and the intermediate plate, a through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate, and the two inclined surfaces of the annular positioning pin are respectively attached to the chamfers of the cylinder and the intermediate plate, so that the intermediate plate and the cylinder are coaxially aligned.

[0008] In some embodiments, the chamfer of the cylinder is symmetrical with the chamfer of the intermediate plate, and the chamfers of the cylinder and the intermediate plate are both formed as axisymmetric structures; and, the two inclined surfaces of the annular positioning pin are symmetrical and both formed as axisymmetric structures.

[0009] In some embodiments, the aperture R3 of the through hole satisfies: R3≥R1 with the aperture R1 of the refrigerant through hole.

[0010] In some embodiments, the angle α1 of the chamfer satisfies: 30° < α1 < 60°; the outer diameter R2 formed by the outer edge of the chamfer and the aperture diameter R1 of the refrigerant through hole satisfy: R2 ≤ 2*R1.

[0011] In some embodiments, the angle of the inclined surface is the same as the angle α1 of the chamfer; the outer diameter R4 of the annular positioning pin and the outer diameter R2 of the chamfer satisfy: R4 ≤ R2; the axial height H2 of the annular positioning pin and the axial height H1 of the chamfer satisfy: H2 ≤ 2H1.

[0012] In some embodiments, the outer diameter R4 of the annular positioning pin and the aperture diameter R3 of the flow hole satisfy: R4 - R3 ≥ 2 mm.

[0013] In some embodiments, along the extending direction of the corresponding chamfer, the length L of the inclined surface of each annular positioning pin fitting with the corresponding chamfer satisfies: L ≥ 1 mm.

[0014] According to one aspect of the present invention, there is provided an assembly method of a cylinder assembly, including: forming a cylinder, an intermediate plate and an annular positioning pin as described in any of the above embodiments; placing the annular positioning pin in the chamfer of the cylinder, so that one inclined surface of the annular positioning pin fits with the chamfer of the cylinder; aligning the refrigerant through hole of the intermediate plate with the refrigerant through hole of the cylinder, covering the intermediate plate on the cylinder, so that the chamfer of the intermediate plate fits with the other inclined surface of the annular positioning pin, and the flow hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate; fixing the intermediate plate and the cylinder through a fastener, so that the annular positioning pin is pressed between the chamfers of the cylinder and the intermediate plate, and the intermediate plate and the cylinder are coaxially aligned.

[0015] According to one aspect of the present invention, there is provided a rotary compressor, and the rotary compressor includes a cylinder assembly as described in any of the above embodiments.

[0016] The beneficial effects of the present invention compared with the prior art at least include:

[0017] The present invention utilizes a pair of inherent refrigerant through holes of the cylinder and the intermediate plate, and only needs to set chamfers on the end faces of the original refrigerant through holes; at the same time, an annular positioning pin with inclined surfaces adapted to the chamfers is designed on the end face. By the inclined surfaces of the annular positioning pin cooperating with the chamfers of the cylinder and the intermediate plate, the concentricity of the intermediate plate and the cylinder is accurately ensured, and the flow hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate, realizing no influence on the refrigerant flow; the present invention can achieve accurate positioning by only using one annular positioning pin, effectively meeting the concentricity of the intermediate plate, and the overall structure of the cylinder assembly is simple, the installation is convenient, and the cost is saved.

[0018] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present invention, and are used together with the specification to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 Schematic partial cross-sectional view of a cylinder assembly in an embodiment of the present invention;

[0021] Figure 2 Schematic partial cross-sectional view of a cylinder and an intermediate plate in an embodiment of the present invention;

[0022] Figure 3 Schematic cross-sectional view of an annular locating pin in an embodiment of the present invention;

[0023] Figure 4 Schematic diagram showing the steps of an assembly method of a cylinder assembly in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.

[0025] The drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted. The processes shown in the drawings are only exemplary illustrations and do not necessarily include all steps. For example, some steps can be decomposed, some steps can be combined or partially combined, and the actual execution order may be changed according to the actual situation.

[0026] In addition, the "first", "second" and similar terms used in the specific description do not denote any order, quantity or importance, but are only used to distinguish different components. It should be noted that the features in the embodiments of the present invention and in different embodiments can be combined with each other without conflict.

[0027] Figure 1 Showing the partial cross-sectional structure of a cylinder assembly in an embodiment, Figure 2 Showing the partial cross-sectional structure of a cylinder and an intermediate plate, Figure 3Shows the cross-sectional structure of the annular locating pin. In combination with Figures 1 to 3 As shown, in this embodiment, the cylinder assembly includes:

[0028] A cylinder 10 and an intermediate plate 20. Chamfers 40 are respectively provided on the opposite end faces of a pair of refrigerant through holes 30 of the cylinder 10 and the intermediate plate 20.

[0029] The intermediate plate 20 is usually used for assembly between two cylinders. Figure 1 And Figure 2 Only one cylinder is schematically shown herein, but not limited thereto. In addition, Figure 1 And Figure 2 Only the partial structures of the cylinder 10 and the intermediate plate 20 are schematically shown herein, specifically the structures around the refrigerant through hole 30 provided with the chamfer 40; in an actual product, the cylinder 10 can be formed into a fan-shaped structure, and a plurality of axially penetrating refrigerant circulation holes are provided on the cylinder wall. Figure 1 And Figure 2 The refrigerant through hole 30 shown in and is only one refrigerant circulation hole on the cylinder wall; and, in an actual product, the intermediate plate 20 can be formed into an annular structure, and a plurality of axially penetrating refrigerant circulation holes are also provided on its annular wall. Figure 1 And Figure 2 The refrigerant through hole 30 shown in and is only one refrigerant circulation hole of the intermediate plate 20.

[0030] An annular locating pin 50 ( Figure 1 Shown in bold frame in), on the outer edges of the two end faces of the annular locating pin 50, inclined surfaces 52 adapted to the corresponding chamfers 40 are respectively provided.

[0031] In this embodiment, the chamfer 40 of the cylinder 10 is formed into a complete circle along the circumferential direction, and the chamfer 40 of the intermediate plate 20 is also formed into a complete circle along the circumferential direction; correspondingly, the two inclined surfaces 52 of the annular locating pin 50 are also respectively formed into a complete circle along the circumferential direction. Thus, it is convenient for the processing of the chamfer 40 and the annular locating pin 50, and it is also convenient for the assembly of the annular locating pin 50 with the cylinder 10 and the intermediate plate 20, and it ensures that the intermediate plate 20 and the cylinder 10 are accurately aligned at all angles in the circumferential direction through the annular locating pin 50.

[0032] The annular locating pin 50 is pressed between the chamfers 40 of the cylinder 10 and the intermediate plate 20. The circulation hole 55 of the annular locating pin 50 communicates with the refrigerant through holes 30 of the cylinder 10 and the intermediate plate 20, and the two inclined surfaces 52 of the annular locating pin 50 are respectively in contact with the chamfers 40 of the cylinder 10 and the intermediate plate 20, and the end face of the cylinder 10 is also in contact with the end face of the intermediate plate 20, and the intermediate plate 20 and the cylinder 10 are coaxially aligned.

[0033] For the cylinder assembly of this embodiment, by utilizing a pair of refrigerant through-holes 30 inherent in the cylinder 10 and the intermediate plate 20, only chamfers 40 need to be provided on the end faces of the refrigerant through-holes 30; meanwhile, an annular positioning pin 50 with inclined surfaces 52 adapted to the chamfers 40 on the end faces is designed to form a positioning pin in the shape of a double-sided convex chess piece, so that the two inclined surfaces 52 of the annular positioning pin 50 are respectively fitted with the chamfers 40 of the cylinder 10 and the intermediate plate 20, accurately ensuring the concentricity between the intermediate plate 20 and the cylinder 10, and the through-hole 55 of the annular positioning pin 50 communicates with the refrigerant through-holes 30 of the cylinder 10 and the intermediate plate 20, realizing no influence on the refrigerant flow; the cylinder assembly can achieve accurate positioning by only using one annular positioning pin 50, effectively meeting the concentricity of the intermediate plate 20, and the overall structure is simple, the installation is convenient, and the cost is saved.

[0034] In one embodiment, the chamfer 40 of the cylinder 10 is symmetrical with the chamfer 40 of the intermediate plate 20, and the chamfers 40 of the cylinder 10 and the intermediate plate 20 are both formed as axisymmetric structures; moreover, the two inclined surfaces 52 of the annular positioning pin 50 are symmetrical and both formed as axisymmetric structures. Thus, the processing cost can be further reduced, the assembly convenience can be improved, so that when assembling, only the annular positioning pin 50 needs to be placed in the chamfer 40 of the cylinder 10, and then the intermediate plate 20 is covered on the cylinder 10 and the positioning pin 50 in alignment through the refrigerant through-holes 30 without complex alignment; and, the matching accuracy between the cylinder 10 and the intermediate plate 20 can be improved, so that the chamfers 40 of the cylinder 10 and the intermediate plate 20 can be seamlessly fitted with the two inclined surfaces 52 of the annular positioning pin 50 at all angles in the circumferential direction.

[0035] Hereinafter, taking the complete symmetry between the chamfer 40 of the cylinder 10 and the chamfer 40 of the intermediate plate 20 as an example, the specific structure of the chamfer 40 will be described; the chamfer 40 mentioned hereinafter can refer to either the chamfer 40 of the cylinder 10 or the chamfer 40 of the intermediate plate 20. Similarly, hereinafter, taking the complete symmetry between the two inclined surfaces 52 of the annular positioning pin 50 as an example, the specific structure of the annular positioning pin 50 will be described; the inclined surface 52 mentioned hereinafter can refer to any one of the inclined surfaces 52 of the annular positioning pin 50.

[0036] In one embodiment, the aperture R3 of the through-hole 55 of the annular positioning pin 50 and the aperture R1 of the refrigerant through-hole 30 of the cylinder 10 / intermediate plate 20 (the apertures of the refrigerant through-holes 30 of the cylinder 10 and the intermediate plate 20 are the same) satisfy: R3≥R1. Thus, it is ensured that the through-hole 55 will not cover the refrigerant through-hole 30, so as not to affect the normal flow of the refrigerant.

[0037] In one embodiment, by designing the size of the chamfer 40, it is ensured that the cylinder assembly can meet the concentricity of the intermediate plate 20 through the cooperation between the chamfer 40 and the annular positioning pin 50 during assembly, and at the same time, it does not affect the stability of the structures of the cylinder 10 and the intermediate plate 20 themselves.

[0038] Specifically, the angle α1 of the chamfer 40 satisfies: 30° < α1 < 60°; for example, the chamfer 40 can be set to: 40°, 45°, 55°, etc.; by limiting the angle α1 of the chamfer 40 within the range of 30° to 60°, the positioning effect achieved by the cooperation of the chamfer 40 and the annular positioning pin 50 can be ensured. The outer diameter R2 formed by the outer edge of the chamfer 40 and the aperture R1 of the refrigerant through hole 30 satisfy: R2 ≤ 2 * R1; for example, R2 = 2 * R1, R2 = 1.8 * R1, R2 = 1.5 * R1, etc.; by limiting the outer diameter R2 of the chamfer 40 to not exceed 2 times the aperture R1 of the refrigerant through hole 30, it is ensured that the chamfer 40 does not occupy too much area so as not to affect the stability of the structures of the cylinder 10 and the intermediate plate 20 themselves.

[0039] The relevant dimensions of the annular positioning pin 50 are adapted to the above dimensions of the chamfer 40. Specifically, the angle α2 of the inclined surface 52 is the same as the angle α1 of the chamfer 40 to ensure that the inclined surface 52 can fit with the chamfer 40. The outer diameter R4 of the annular positioning pin 50 and the outer diameter R2 of the chamfer 40 satisfy: R4 ≤ R2; Figure 1 In the shown structure, R4 < R2, and there is a certain gap between the outer ring of the annular positioning pin 50 and the outer edge of the chamfer 40; in other embodiments, R4 = R2 can be set. In addition, the axial height H2 of the annular positioning pin 50 and the axial height H1 of the chamfer 40 satisfy: H2 ≤ 2H1; Figure 1 In the shown structure, H2 < 2H1, and there is a certain gap between the upper and lower end faces of the annular positioning pin 50 and the refrigerant through hole 30; in other embodiments, H2 = 2H1 can be set.

[0040] Furthermore, the outer diameter R4 of the annular positioning pin 50 and the aperture R3 of its flow through hole 55 satisfy: R4 - R3 ≥ 2 mm. For example, R4 - R3 = 2 mm, R4 - R3 = 2.6 mm, R4 - R3 = 3 mm, etc. Thus, the stability of the structure of the annular positioning pin 50 itself is ensured.

[0041] In one embodiment, along the extending direction of the corresponding chamfer 40, the length L of the contact between each inclined surface 52 of the annular positioning pin 50 and the corresponding chamfer 40 satisfies: L ≥ 1 mm. For example, L = 1 mm, L = 1.6 mm, L = 2 mm, etc. Thus, the contact area between the inclined surface 52 of the annular positioning pin 50 and the corresponding chamfer 40 is ensured, making the cooperation between the annular positioning pin 50 and the cylinder 10 and the intermediate plate 20 stable.

[0042] Of course, the dimensions listed above are only exemplary. In other embodiments, the dimensions of the chamfers 40 of the cylinder 10 / intermediate plate 20 can be adjusted as needed, and the relevant dimensions of the annular positioning pin 50 can be adjusted accordingly, as long as it is ensured that the two inclined surfaces 52 of the annular positioning pin 50 are respectively in contact with the chamfers 40 of the cylinder 10 and the intermediate plate 20 to achieve concentric alignment of the intermediate plate 20 and the cylinder 10.

[0043] An embodiment of the present invention also provides an assembly method for a cylinder assembly, where the cylinder assembly is the cylinder assembly described in any of the above embodiments. The features and principles of the cylinder assembly described in any of the above embodiments can be applied to the following assembly method embodiments. In the following assembly method embodiments, the features and principles regarding the cylinder assembly that have been elucidated will not be repeated.

[0044] Figure 4 The main steps of the assembly method of the cylinder assembly in one embodiment are shown. Refer to Figure 4 As shown, the assembly method of the cylinder assembly in this embodiment includes the following steps:

[0045] S610, form a cylinder, an intermediate plate, and an annular positioning pin as described in any of the above embodiments; wherein, chamfers are respectively provided on the opposite end faces of a pair of refrigerant through holes of the cylinder and the intermediate plate; the outer edges of the two end faces of the annular positioning pin are respectively provided with inclined surfaces adapted to the corresponding chamfers.

[0046] The refrigerant through holes are the original ones of the cylinder and the intermediate plate. When forming the above-mentioned cylinder and intermediate plate, only chamfers need to be machined on the opposite end faces of the original pair of refrigerant through holes.

[0047] S620, place the positioning pin in the chamfer of the cylinder so that one inclined surface of the annular positioning pin is in contact with the chamfer of the cylinder. And, the other inclined surface of the annular positioning pin will be exposed for positioning the intermediate plate.

[0048] S630, align the refrigerant through hole of the intermediate plate with the refrigerant through hole of the cylinder, cover the intermediate plate on the cylinder, so that the chamfer of the intermediate plate is in contact with the other inclined surface of the annular positioning pin, and the through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate.

[0049] Through the double-sided convex chess-piece-shaped positioning pin, its outer ring cooperates with the chamfer, and its inner hole cooperates with the refrigerant through hole, which not only realizes precise positioning but also does not affect the flow of the refrigerant.

[0050] S640, fix the intermediate plate and the cylinder through fasteners, so that the annular positioning pin is pressed between the chamfers of the cylinder and the intermediate plate, and the intermediate plate is coaxially aligned with the cylinder. And, under the action of the fasteners, the end face of the intermediate plate will also be in close contact with the end face of the cylinder.

[0051] Therefore, in the above assembly method, chamfers are machined on the opposite end faces of a pair of refrigerant through holes inherent in the cylinder and the intermediate plate, and an annular positioning pin with an inclined surface adapted to the chamfers of the cylinder and the intermediate plate is designed on the end face, so that the inclined surface of the annular positioning pin fits the chamfers of the cylinder and the intermediate plate, accurately realizing the concentricity between the intermediate plate and the cylinder, and the through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate, realizing no influence on the refrigerant flow; the assembly method is simple and convenient, and the overall structure of the assembled cylinder assembly is concise, saving costs.

[0052] Furthermore, the embodiment of the present invention also provides a rotary compressor, which includes the cylinder assembly described in any of the above embodiments. The rotary compressor may specifically be a hermetic rotary compressor. The rotary compressor of the present invention can utilize a pair of refrigerant through holes inherent in the cylinder and the intermediate plate, and chamfers are provided on their end faces; at the same time, an annular positioning pin with an inclined surface adapted to the chamfers is designed, and the concentricity between the intermediate plate and the cylinder is accurately ensured through the cooperation of the inclined surface of the annular positioning pin and the chamfers, and the through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate, realizing no influence on the refrigerant flow; thus, the concentricity of the intermediate plate can be effectively satisfied, ensuring the stable operation of the rotary compressor, and the overall structures of the cylinder assembly and the rotary compressor are simple, easy to install, and cost-saving.

[0053] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A cylinder assembly, characterized in that, Comprising: A cylinder and an intermediate plate, chamfers are respectively provided on the opposite end faces of a pair of refrigerant through holes of the cylinder and the intermediate plate, and the chamfers of the cylinder and the intermediate plate are respectively formed as a complete circle along the circumferential direction; An annular positioning pin, on the outer edges of the two end faces of the annular positioning pin, inclined surfaces adapted to the corresponding chamfers are respectively provided, and the two inclined surfaces of the annular positioning pin are respectively formed as a complete circle along the circumferential direction; The annular positioning pin is pressed between the chamfers of the cylinder and the intermediate plate, the through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate, and the two inclined surfaces of the annular positioning pin are respectively in contact with the chamfers of the cylinder and the intermediate plate, so that the intermediate plate is coaxially aligned with the cylinder.

2. The cylinder assembly according to claim 1, characterized in that, The chamfer of the cylinder is symmetrical with the chamfer of the intermediate plate, and the chamfers of the cylinder and the intermediate plate are both formed as axisymmetric structures; and The two inclined surfaces of the annular positioning pin are symmetrical and both formed as axisymmetric structures.

3. The cylinder assembly according to claim 2, wherein, The aperture R3 of the through hole satisfies: R3≥R1 with the aperture R1 of the refrigerant through hole.

4. The cylinder assembly according to claim 2, wherein, The angle α1 of the chamfer satisfies: 30°<α1<60°; The outer diameter R2 formed by the outer edge of the chamfer satisfies: R2≤2*R1 with the aperture R1 of the refrigerant through hole.

5. The cylinder assembly according to claim 4, wherein The angle of the inclined surface is the same as the angle α1 of the chamfer; The outer diameter R4 of the annular positioning pin satisfies: R4≤R2 with the outer diameter R2 of the chamfer. The axial height H2 of the annular positioning pin satisfies: H2≤2H1 with the axial height H1 of the chamfer.

6. The cylinder assembly according to claim 5, characterized in that, The outer diameter R4 of the annular positioning pin satisfies: R4 - R3≥2mm with the aperture R3 of the through hole.

7. The cylinder assembly according to claim 2, wherein, Along the extension direction of the corresponding chamfer, the length L of the contact between each inclined surface of the annular positioning pin and the corresponding chamfer satisfies: L≥1mm.

8. An assembly method of a cylinder assembly, characterized in that, Comprising: Forming the cylinder, intermediate plate and annular positioning pin as described in any one of claims 1 - 7; Placing the annular positioning pin in the chamfer of the cylinder so that one inclined surface of the annular positioning pin is in contact with the chamfer of the cylinder; Aligning the refrigerant through hole of the intermediate plate with the refrigerant through hole of the cylinder, covering the intermediate plate on the cylinder so that the chamfer of the intermediate plate is in contact with the other inclined surface of the annular positioning pin, and the through hole of the annular positioning pin communicates with the refrigerant through holes of the cylinder and the intermediate plate; Fixing the intermediate plate and the cylinder through fasteners so that the annular positioning pin is pressed between the chamfers of the cylinder and the intermediate plate, and the intermediate plate is coaxially aligned with the cylinder.

9. A rotary compressor, characterized in that, The rotary compressor includes the cylinder assembly as described in any one of claims 1 - 7.

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