Lower end cover assembly for compressor, compressor and air conditioner

Abstract

A chassis is detachably connected with a sleeve diameter, a universal oil groove is formed in the sleeve diameter, and an included angle beta formed by the oil groove and an upper end cover exhaust hole on a two-dimensional plane is changed by adjusting the circumferential installation direction of the sleeve diameter, so that the lower end cover assembly can be used for the compressor. The assembly requirements of different refrigerants and compressors of different models and specifications can be met by flexibly adjusting the included angle, the distribution circulation path of various different refrigerant oil liquid is met, the installation direction of the sleeve diameter relative to the base plate is adjusted according to pump bodies of the compressors in different rotation directions, the base plate and the sleeve diameter are detachably connected, and the assembly efficiency is improved. The chassis and the sleeve diameter can be independently replaced according to different requirements, the adaptability of the lower end cover assembly is higher, the assembly requirements of various specifications can be met through one set of lower end cover assembly, the assembly efficiency is high, and the operation reliability of the compressor is improved.

Description

Technical Field

[0001] This invention belongs to the field of compressor technology and relates to a lower end cover assembly for a compressor, a compressor, and an air conditioner. Background Technology

[0002] With the development of compressor technology and the diversification of working fluids, different working fluids have different refrigeration capacities per unit volume and operating pressures, leading to different designs for the compressor pump body structure and strength. During production, the lower end cover of the pump body has numerous specifications due to variations in its inner hole size, overall height, and chassis thickness and diameter. Simultaneously, the lower end cover contains an oil groove, which needs to match the vent holes on the upper end cover according to the rotation direction of the oil groove. The circumferential distribution angle of the oil groove also varies depending on the compressor's rotation direction, the working fluid, and its intended use. However, in existing structures, the lower end cover structure is fixed. Different lower end cover structures need to be manufactured for different refrigerant distribution paths. This necessitates the production of multiple parts of various specifications. The compatibility of each part is low, and the high similarity between different specifications makes them difficult to distinguish visually, easily leading to material mixing and affecting assembly efficiency. Summary of the Invention

[0003] The purpose of this invention is to solve the problem that the structure of the lower end cover in the prior art is fixed, which cannot be adjusted or modified for different specifications of refrigerants and compressors, resulting in low adaptability and affecting assembly efficiency. The invention provides a lower end cover assembly for a compressor, a compressor, and an air conditioner.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A lower end cover assembly for a compressor includes a chassis with a sleeve provided on the chassis, the chassis and the sleeve being detachably connected; An oil groove is formed on the inner sidewall of the sleeve, and an exhaust hole is formed on the upper end cover that mates with the lower end cover assembly. The oil groove and the exhaust hole form an angle β on a two-dimensional plane.

[0005] A further improvement of the present invention is that: The sleeve diameter includes a first sleeve diameter and a second sleeve diameter that are connected axially in sequence. The diameter of the first sleeve diameter is larger than the diameter of the second sleeve diameter. An inner hole is formed on the chassis. During assembly, the outer wall of the first sleeve diameter is interference-fitted with the inner hole of the chassis. There is a gap between the second sleeve diameter and the inner hole of the chassis. The gap forms an annular cavity, which is used to store refrigeration oil.

[0006] When the refrigerant in the air conditioner is R410A or R32, the axial height e of the second sleeve diameter satisfies: 0 mm ≤ e ≤ 6 mm, the outer diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter satisfy: 1.5 mm ≤ b1 - b3 ≤ 4 mm, and the inner diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter satisfy: 1 ​​mm ≤ b3 - b2 ≤ 1.5 mm, where b1 represents the outer diameter of the first sleeve diameter, b2 represents the inner diameter of the first sleeve diameter, and b3 represents the outer diameter of the second sleeve diameter.

[0007] When the refrigerant in the air conditioner is R290, R134a, or R22, the axial height e of the second sleeve diameter is 0 ≤ mm and e ≤ 3 mm. The outer diameters of the first and second sleeve diameters satisfy: 1 ​​mm ≤ b1 - b3 ≤ 3 mm. The inner diameter of the first and second sleeve diameters satisfy: 1 ​​mm ≤ b3 - b2 ≤ 1.5 mm. b1 represents the outer diameter of the first sleeve diameter, b2 represents the inner diameter of the first sleeve diameter, and b3 represents the outer diameter of the second sleeve diameter.

[0008] The lower end face of the sleeve is flush with the lower end face of the chassis.

[0009] The lower end face of the sleeve is located inside the inner hole, and there is an axial height difference m between the lower end face of the sleeve and the lower end face of the chassis, where 1 mm ≤ m ≤ 3 mm.

[0010] When the refrigerant in the air conditioner is R410A or R32: The included angle β ranges from 45° ≤ β ≤ 35°; The chassis is made of steel or cast iron, and the sleeve is made of cast iron.

[0011] When the refrigerant in the air conditioner is R290, R134a, or R22: The included angle β ranges from 50° ≤ β ≤ 35°; The chassis is made of cast iron or powder metallurgy; the sleeve is made of powder metallurgy.

[0012] A compressor including the lower end cover assembly described in this invention.

[0013] An air conditioner includes the compressor described in this invention.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention discloses a lower end cover assembly for a compressor, with a detachable connection between the chassis and the sleeve. A universal oil groove is formed on the sleeve. By adjusting the circumferential installation direction of the sleeve, the included angle β formed between the oil groove and the exhaust port of the upper end cover in a two-dimensional plane is changed. By flexibly adjusting the included angle, it can adapt to the assembly requirements of compressors with different refrigerants and different models and specifications, and meet the distribution and circulation paths of various refrigerant oils. For pumps with different rotation directions of the compressor, the installation direction of the sleeve relative to the chassis can be adjusted. Moreover, the chassis and sleeve are detachably connected, which facilitates the individual replacement of the chassis and sleeve for different needs. The lower end cover assembly has higher adaptability. One set of lower end cover assemblies can meet the assembly requirements of multiple specifications, resulting in high assembly efficiency and improved compressor operation reliability.

[0015] Furthermore, in this invention, there is a gap between the second sleeve diameter and the inner hole, and the gap forms an annular cavity. The annular cavity is used to store refrigeration oil and reduce the frictional power consumption of the parts.

[0016] Furthermore, in this invention, the axial position of the sleeve diameter relative to the chassis is adjusted according to different assembly requirements. The lower end face can be flush with the lower end face of the chassis, or there can be a certain height difference. When there is a height difference, a storage cavity is formed by the height difference to store lubricating oil. The amount of oil stored is changed by adjusting the height difference. When the compressor rotates at high speed, the pump body lubricating oil is replenished to reduce the mechanical friction power consumption of the parts.

[0017] This invention also discloses a compressor, including a lower end cover assembly. The lower end cover assembly comprises a chassis and a sleeve, which are detachably connected. A universal oil groove is formed on the sleeve. By adjusting the circumferential installation direction of the sleeve, the angle β formed between the oil groove and the exhaust port of the upper end cover on the two-dimensional plane is changed. By flexibly adjusting the angle, it can adapt to the assembly requirements of compressors with different refrigerants and different models and specifications, and meet the distribution and circulation paths of various refrigerant oils. For pumps with different rotation directions of the compressor, the installation direction of the sleeve relative to the chassis can be adjusted. The chassis and sleeve are detachably connected, which facilitates the individual replacement of the chassis and sleeve for different needs. The lower end cover assembly has higher adaptability. One set of lower end cover assemblies can meet the assembly requirements of multiple specifications, resulting in high assembly efficiency and improved compressor operation reliability.

[0018] This invention also discloses an air conditioner. The lower end cover assembly of the air conditioner includes a chassis and a sleeve, which are detachably connected. A universal oil groove is formed on the sleeve. By adjusting the circumferential installation direction of the sleeve, the angle β formed between the oil groove and the exhaust hole of the upper end cover on the two-dimensional plane is changed. By flexibly adjusting the angle, it can adapt to the assembly requirements of different refrigerants and different models and specifications of compressors, and meet the distribution and circulation paths of various refrigerant oils. For pumps with different rotation directions of the compressor, the installation direction of the sleeve relative to the chassis can be adjusted. Moreover, the chassis and sleeve are detachably connected, which facilitates the individual replacement of the chassis and sleeve for different needs. The lower end cover assembly has higher adaptability. One set of lower end cover assemblies can meet the assembly requirements of multiple specifications, resulting in high assembly efficiency and improved compressor operation reliability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional view of the lower end cap assembly provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the chassis of the lower end cover assembly provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the lower end cap assembly sleeve diameter provided in an embodiment of the present invention; Figure 4 is a schematic diagram of the upper end cover, lower end cover assembly, and cylinder installation provided in an embodiment of the present invention (wherein, Figure 4a It is a 3D image. Figure 4b (Top view).

[0021] Wherein: 5-Cylinder; 6-Lower end cover assembly; 61-Chassis; 62-Sleeve diameter 611 - Chassis inner hole; 613 - Chassis lower end face; 614 - Chassis countersunk hole; 621 - Inner diameter of the sleeve; 622 - Outer diameter of the sleeve; 623 - Lower end face of the sleeve; 6211 - Upper oil groove of the inner hole; 6221 - Second sleeve diameter; 21 - Vent hole on the upper end cover; 22 - Inner hole of the upper end cover; Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention 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 the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings: See Figure 1This invention discloses a compressor, including a chassis 61 and a sleeve inner bore 621. The size, material, and surface treatment of this compressor are suitable for use with common refrigerants in household air conditioners, such as R32 and R290. Furthermore, for pump bodies rotating in different directions, the angle β between the upper oil groove 6211 of the sleeve inner bore 621 and the exhaust port 21 of the upper end cover can be adjusted by modifying the assembly position of the sleeve 621 with the chassis 61 in the lower end cover assembly. This significantly reduces the number of lower end cover components and improves the operational reliability of the compressor.

[0028] Both the chassis 61 and the sleeve diameter 62 are cylindrical structures. They are assembled by cold pressing. After cold pressing, the end face 623 of the sleeve diameter is flush with the end face 613 of the chassis. The sleeve diameter 62 is subjected to carburizing and coating treatment according to different working fluid requirements, which must be completed before cold pressing assembly.

[0029] Specifically, it includes the following structure: Example 1 This invention discloses a lower end cover assembly for a compressor, including a chassis 61, a sleeve diameter 62 provided on the chassis 61, and the chassis 61 and the sleeve diameter 62 being detachably connected. An inner hole upper oil groove 6211 is provided on the inner side wall of the sleeve diameter 62, and an upper end cover vent hole 21 is provided on the upper end cover that cooperates with the lower end cover assembly. The inner hole upper oil groove 6211 and the upper end cover vent hole 21 form an angle β on a two-dimensional plane.

[0030] Furthermore, in this embodiment, the sleeve diameter 62 includes a first sleeve diameter and a second sleeve diameter 6221 connected axially in sequence; the diameter of the first sleeve diameter is larger than the diameter of the second sleeve diameter 6221, and an inner hole 611 is formed on the chassis 61. During assembly, the outer wall of the first sleeve diameter is interference-fitted with the inner hole 611, and there is a gap between the second sleeve diameter 6221 and the inner hole 611. The gap forms an annular cavity, which is used to store refrigeration oil.

[0031] Furthermore, in this embodiment, both the chassis 61 and the sleeve diameter 62 are cylindrical structures, and they are combined by cold pressing. After cold pressing, the end face 623 of the sleeve diameter is flush with the end face 613 of the chassis. The sleeve diameter 62 is subjected to carburizing and coating treatment according to different working fluid requirements, which needs to be completed before cold pressing assembly.

[0032] Furthermore, in this embodiment, the lower end face 623 of the sleeve diameter 62 is located inside the inner hole 611, and there is an axial height difference m between the lower end face 623 of the sleeve diameter and the lower end face 613 of the chassis 61, where 1 mm ≤ m ≤ 3 mm. When there is an axial height difference m between the lower end face 623 of the sleeve diameter and the lower end face 613 of the chassis, the pump body structure uses the top of the short shaft of the eccentric shaft as the support for the pump body. By adjusting the range of values ​​for m, the oil storage capacity is changed. When the compressor rotates at high speed, the pump body lubricating oil is replenished, reducing the mechanical friction power consumption of the parts.

[0033] Furthermore, in this embodiment, the structural proportions of the sleeve diameter 62 and the chassis 61 are different for different refrigerants: When the refrigerant in the air conditioner is R410A or R32: The axial height e of the second set of diameter 6221 satisfies: 0 mm ≤ e ≤ 6 mm; The outer diameter of the first fitting and the outer diameter of the second fitting 6221 satisfy 1.5 mm ≤ b1 - b3 ≤ 4 mm; The inner diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter 6221 satisfy 1 mm ≤ b3 - b2 ≤ 1.5 mm, where b1 represents the outer diameter of the first sleeve diameter, b2 represents the inner diameter of the first sleeve diameter, and b3 represents the outer diameter of the second sleeve diameter 6221. When the refrigerant in the air conditioner is R290, R134a, or R22: The axial height e of the second set of diameter 6221 is 0 ≤ mm and e ≤ 3 mm; The outer diameter of the first set of diameters and the outer diameter of the second set of diameters 6221 satisfy 1 mm ≤ b1 - b3 ≤ 3 mm; The inner diameter of the first fitting diameter and the outer diameter of the second fitting diameter 6221 satisfy 1 mm ≤ b3 - b2 ≤ 1.5 mm; where b1 represents the outer diameter of the first fitting diameter, b2 represents the inner diameter of the first fitting diameter, and b3 represents the outer diameter of the second fitting diameter 6221.

[0034] Furthermore, in this embodiment, the inner hole 611 of the chassis and the outer diameter 622 of the sleeve need to be interference-fitted, and after the fit, the inner hole 621 of the sleeve can only be subjected to processes such as extrusion and brushing. Let the diameter of the inner hole 611 of the chassis be 'a', then the interference fit between the two parts must satisfy: When the refrigerant in the air conditioner is R410A or R32, the diameter b1 of the outer circle 622 of the sleeve and the inner hole 611a of the chassis satisfy: 0.01mm≤b1-a≤0.02mm.

[0035] When the refrigerant in the air conditioner is R290, R134a or R22, the diameter b1 of the outer circle 622 of the sleeve and the inner hole 611a of the chassis satisfy: 0.005 mm ≤ b1 - a ≤ 0.01 mm.

[0036] Furthermore, in this embodiment, for different needs, the sleeve diameter 62 and the chassis 61 can be made of different materials for assembly, and the included angle β can also be adjusted appropriately: When the refrigerant in the air conditioner is R410A or R32: The included angle β ranges from 45° ≤ β ≤ 35°; The chassis 61 is made of steel or cast iron, and the sleeve 62 is made of cast iron. When the refrigerant in the air conditioner is R290, R134a, or R22: The included angle β is in the range of 50°≤β≤35°.

[0037] Furthermore, in this embodiment, a plurality of countersunk holes 614 are distributed on the chassis 61. During assembly, the cylinder bolts are connected to the cylinder 5 to be fitted through the countersunk holes 614, forming the working cavity of the pump body together with the upper end cover in the compressor. The axial height of the chassis 61 is h1, and h1≥15mm. The depth of the countersunk holes 614 is h2, and h1 and h2 satisfy: When the refrigerant in the air conditioner is R410A or R32, h1 and h2 satisfy 8 mm ≤ h1 - h2 ≤ 10 mm; When the refrigerant in the air conditioner is R290, R134a, or R22: h1 and h2 satisfy 6 mm ≤ h1 - h2 ≤ 8 mm.

[0038] Example 2 The lower end cover assembly 6 of the present invention consists of two parts: a chassis 61 and a sleeve diameter 62. By changing the size, material, and surface treatment of the inner hole 621 of the sleeve diameter, it can accommodate commonly used refrigerants in household air conditioners such as R32 and R290. Furthermore, for pump bodies with different rotation directions of the compressor, the angle β between the upper oil groove 6211 of the inner hole 621 of the sleeve diameter and the exhaust port 21 of the upper end cover can be adjusted by modifying the assembly position of the sleeve diameter 62 and the chassis 61 in the lower end cover assembly. This significantly reduces the number of lower end cover components and improves the operational reliability of the compressor.

[0039] Reference Figure 1 As shown, in the lower end cap assembly 6 disclosed in this invention, both the chassis 61 and the sleeve diameter 62 are cylindrical structures. They are assembled by cold pressing. After cold pressing, the end face 623 of the sleeve diameter is flush with the end face 613 of the chassis. The sleeve diameter 62 undergoes carburizing and coating treatment according to different working fluid requirements, which needs to be completed before cold pressing assembly. The materials of the chassis 61 and the sleeve diameter 62 for different refrigerant working fluids are selected as shown in the table below:

[0040] Reference Figure 1 As shown in Figure 4, both the base 61 and the sleeve diameter 62 in the lower end cover assembly 6 are cylindrical structures. The base 61 is a standard part and can be assembled with different sleeve diameters 62, suitable for commonly used refrigerants in household air conditioners such as R32 and R290. The outer diameter of the sleeve diameter 622 is b1, and the inner diameter of the hole 621 is b2. Therefore:

[0041] Reference Figure 2 As shown in Figure 4, the base 61 and sleeve 62 in the lower end cover assembly 6 are assembled by cold pressing. The inner hole 611 of the base and the outer circle 622 of the sleeve need to be interference-fitted, and after the fit, the inner hole 621 of the sleeve can only be subjected to processes such as extrusion and brushing. Let the diameter of the inner hole 611 of the base be 'a', then the selection of the interference fit between the two parts is shown in the table below:

[0042] Reference Figure 2 As shown, the chassis 61 of the lower end cover assembly 6 has several countersunk holes 614 distributed on it. The cylinder screw is connected to the cylinder 5 in the pump body assembly 100 through the countersunk holes, forming the working cavity of the pump body together with the upper end cover 2. Let the thickness of the chassis 61 be h1, and h1≥15, and the depth of the countersunk holes 614 be h2, then...

[0043] Reference Figure 2 As shown in Figure 4, the thickness of the base 61 of the lower end cover assembly 6 is h1, and the height of the sleeve diameter 62 is H. Then 1≤H / h1≤1.5.

[0044] Referring to Figure 4, the lower end cover assembly 6 has an upper oil groove 6211 in its inner diameter. When the compressor rotates, the refrigerant oil at the bottom of the pump body flows into the upper oil groove 6211, forming an oil film between the auxiliary shaft 12 and the inner diameter 621 to reduce mechanical wear between them. The circumferential position of the upper oil groove 6211 is determined by the angle β between it and the exhaust hole 21 of the upper end cover. The rotation direction of the pump body is not exactly the same for different models. Therefore, the upper oil groove 6211 starts and the exhaust hole 21 of the upper end cover ends, and the angle direction is the same as the rotation direction of the pump body. The selection of angle β is shown in the table below.

[0045]

[0046] Reference Figure 1 As shown, the contact length between the outer diameter 622 of the lower end cover assembly 6 and the inner hole 611 of the chassis is L, then 10≤L.

[0047] Reference Figure 3 As shown, the lower end cover assembly 6 has a recessed structure 6221 near the end face 623 on the outer circle of the sleeve diameter 622. The recessed depth is e, and the outer circle of the recessed part is b3. The recessed outer circle of the sleeve diameter and the inner hole 611 of the chassis form an annular cavity. When the compressor rotates, it can store some refrigeration oil. When the pump body is short of oil at high speed or low speed, it can be replenished, so that the compressor has a wider operating range.

[0048]

[0049] Compared with existing compressors, the rotary compressor 1000 of this invention features a modular lower end cover. By changing the size of the inner bore, material, and surface treatment, it can accommodate commonly used refrigerants in household air conditioning systems, such as R32 and R290. Furthermore, for pumps rotating in different directions, the angle between the upper oil groove of the inner bore and the exhaust port of the upper end cover can be adjusted by modifying the assembly position of the lower end cover assembly with the chassis, significantly reducing the number of lower end cover types.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A lower end cover assembly for a compressor, characterized by, The bottom plate (61) is provided with a sleeve diameter (62), and the bottom plate (61) and the sleeve diameter (62) are detachably connected; An inner hole upper oil groove (6211) is formed in the inner side wall of the sleeve diameter (62), and an upper end cover exhaust hole (21) is formed in the upper end cover matched with the lower end cover assembly, and the inner hole upper oil groove (6211) and the upper end cover exhaust hole (21) form an included angle β in a two-dimensional plane.

2. A lower end cover assembly for a compressor as set forth in claim 1, wherein, The sleeve diameter (62) comprises a first sleeve diameter and a second sleeve diameter (6221) connected in sequence in the axial direction; The diameter of the first sleeve diameter is greater than the diameter of the second sleeve diameter (6221), and the bottom plate (61) is provided with a bottom plate inner hole (611), and when assembled, the outer side wall of the first sleeve diameter is in interference fit with the bottom plate inner hole (611), and there is a gap between the second sleeve diameter (6221) and the bottom plate inner hole (611), and the gap forms an annular cavity, and the annular cavity is used for storing the freezer oil.

3. A lower end cover assembly for a compressor as set forth in claim 2, wherein, When the refrigerant in the air conditioner is R410A refrigerant or R32 refrigerant, the axial height e of the second sleeve diameter (6221) satisfies: 0 mm≤e≤6 mm, the outer diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter (6221) satisfy: 1.5 mm≤b1-b3≤4 mm, and the inner diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter (6221) satisfy: 1 mm≤b3-b2≤1.5 mm, wherein b1 represents the outer diameter of the first sleeve diameter, b2 represents the inner diameter of the first sleeve diameter, and b3 represents the outer diameter of the second sleeve diameter (6221).

4. A lower end cover assembly for a compressor as set forth in claim 2, wherein, When the refrigerant in the air conditioner is R290 refrigerant, R134a refrigerant or R22 refrigerant, the axial height e of the second sleeve diameter (6221) is 0≤mm e ≤3 mm, the outer diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter (6221) satisfy: 1 mm≤b1-b3≤3 mm, and the inner diameter of the first sleeve diameter and the outer diameter of the second sleeve diameter (6221) satisfy: 1 mm≤b3-b2≤1.5 mm; b1 represents the outer diameter of the first sleeve diameter, b2 represents the inner diameter of the first sleeve diameter, and b3 represents the outer diameter of the second sleeve diameter (6221).

5. A lower end cover assembly for a compressor as set forth in claim 1, characterized in that, The lower end surface (623) of the sleeve diameter (62) is flush with the bottom plate lower end surface (613) of the bottom plate (61).

6. A lower end cover assembly for a compressor as set forth in claim 1, characterized in that, The sleeve diameter lower end surface (623) of the sleeve diameter (62) is located inside the inner hole (611), and there is an axial height difference m between the sleeve diameter lower end surface (623) and the bottom plate lower end surface (613) of the bottom plate (61), 1 mm≤m≤3 mm.

7. A lower end cover assembly for a compressor as set forth in claim 1, characterized in that, When the refrigerant in the air conditioner is R410A refrigerant or R32 refrigerant: The included angle β ranges from 45° to 35°; The material of the bottom plate (61) is steel or cast iron, and the material of the sleeve diameter (62) is cast iron.

8. A lower end cover assembly for a compressor as set forth in claim 7 wherein, When the refrigerant in the air conditioner is R290 refrigerant, R134a refrigerant or R22 refrigerant: The included angle β ranges from 50° to 35°; The material of the bottom plate (61) is cast iron or powder metallurgy, and the material of the sleeve diameter (62) is powder metallurgy.

9. A compressor characterized by, The lower end cover assembly of claim 1 is included.

10. An air conditioner characterized by comprising: The compressor of claim 1 is included.

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