Vane rotary compressor having a bearing with back pressure pockets

Patent metadata

Field	Value
Publication number	US-11428224-B2
Application number	US-201916528716-A
Country	US
Kind code	B2
Filing date	Aug 1, 2019
Priority date	Nov 9, 2018
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A vane rotary compressor has a cylinder. A main bearing and a sub bearing are coupled to the cylinder forming a compression space. The main and sub bearing each have a back pressure pocket on a surface facing the cylinder. The main bearing and the sub bearing radially support a rotation shaft. A roller coupled to the shaft is disposed within the compression space. The roller has circumferentially spaced vane slots, each vane slot extending from an open end on an outer circumferential surface of the roller to a back pressure chamber disposed within the roller at an opposite end of each vane slot. A plurality of vanes slide within the vane slots and divide the compression space into compression chambers. At least one of the back pressure chambers in the vane slots fluidly communicates with at least one of the back pressure pockets in the main and sub bearings.

First claim

What is claimed is:

1. A vane rotary compressor, comprising:
a cylinder;
a main bearing and a sub bearing coupled to the cylinder, the main bearing and the sub bearing forming a compression space together with the cylinder, the main bearing including a main bearing back pressure pocket and the sub bearing including a sub bearing back pressure pocket;
a rotation shaft radially supported by the main bearing and the sub bearing;
a roller including a plurality of vane slots spaced apart from each other along a circumferential direction, each vane slot including one end open toward an outer circumferential surface of the roller, and a back pressure chamber disposed adjacent an opposite end of the vane slot, the back pressure chamber being configured to communicate with at least one of the main bearing back pressure pocket or the sub bearing back pressure pocket; and
a plurality of vanes slidably inserted into the vane slots, the vanes being configured to protrude in a direction toward an inner circumferential surface of the cylinder, the vanes being arranged so as to divide the compression space into a plurality of compression chambers,
wherein the at least one of the main bearing back pressure pocket or the sub bearing back pressure pocket includes a plurality of pockets having different inner pressure along the circumferential direction,
wherein the plurality of pockets include bearing protrusion portions formed on an inner circumferential side, the protrusion portions forming radial bearing surfaces with respect to an outer circumferential surface of the rotation shaft, and
wherein 2≤H/T≤6 when an axial depth of the at least one of the main bearing back pressure pocket or the sub bearing back pressure pocket is H and a radial width of the bearing protrusion portion is T.

2. The compressor of claim 1 , wherein the plurality of pockets include:
a first pocket having a first pressure; and
a second pocket having a second pressure higher than the first pressure,
wherein a bearing protrusion portion of the second pocket includes a communication flow path through which an inner circumferential surface of the bearing protrusion portion communicates with an outer circumferential surface of the bearing protrusion portion.

3. The compressor of claim 2 , wherein at least a part of the communication flow path overlaps an oil groove provided on a radial bearing surface of the main bearing or the sub bearing.

4. The compressor of claim 3 , wherein the communication flow path is formed as a communication groove recessed by a predetermined width and depth into an axial end surface of the bearing protrusion portion.

5. The compressor of claim 3 , wherein the communication flow path is formed as a communication hole penetrating through the inner circumferential surface and the outer circumferential surface of the bearing protrusion portion.

6. The compressor of claim 3 , wherein the communication flow path is formed so that an area thereof at an inner circumferential surface of the bearing protrusion portion is larger than an area at an outlet side thereof.

7. The compressor of claim 1 , wherein L−H≥2 mm when a portion defining a compression space on the main bearing or the sub bearing is referred to as a flange portion and a thickness of the flange portion is L.

8. The compressor of claim 7 , wherein the bearing protrusion portion is formed to have a same axial depth and a radial width along the circumferential direction.

9. The compressor of claim 1 , wherein the roller is concentric with a center of the rotation shaft and eccentric with respect to a center of the cylinder.

10. The compressor of claim 9 , wherein the roller has an outer circumferential surface positioned closer to the inner circumferential surface of the cylinder at one circumferential location relative to other circumferential locations.

11. The compressor of claim 1 , wherein the rotation shaft includes an oil flow path formed in a central portion thereof along an axial direction,
wherein the oil flow path includes an oil passage hole extending from an inner circumferential surface thereof toward the outer circumferential surface of the rotation shaft, and
wherein the oil passage hole is positioned between ends of within the radial bearing surface.

12. The compressor of claim 11 , wherein the oil passage hole is formed in a manner that at least part thereof overlaps an axial range of the bearing protrusion portion.

13. A vane rotary compressor, comprising:
a casing;
a motor located in the casing;
a cylinder located in the casing;
a main bearing positioned between the motor and the cylinder on one side of the cylinder;
a sub bearing positioned opposite to the main bearing on an opposite side of the cylinder, the main bearing and the sub bearing being coupled to the cylinder and defining a compression space between the main bearing and the sub bearing, at least one of the main bearing or the sub bearing including a back pressure pocket disposed adjacent an inner circumferential surface of a respective one of the main bearing or the sub bearing;
a roller positioned in the compression space, the roller including a plurality of circumferentially spaced apart vane slots extending into the roller from open ends on an outer circumferential surface of the roller to closed ends within the roller;
a plurality of vanes slidably positioned in the vane slots, the vanes being separated from the closed ends of the vane slots by back pressure chambers, the vanes protruding from the open ends toward an inner circumferential surface of the cylinder;
a rotation shaft having a first end coupled to the motor and a second end coupled to the roller, the rotation shaft extending through both the main bearing and the sub bearing;
wherein at least one back pressure chamber of at least one of the vane slots is configured to communicate with at least one of the main bearing back pressure pocket or the sub bearing back pressure pocket, and
wherein 2≤H/T≤6 when an axial depth of the at least one of the main bearing back pressure pocket or the sub bearing back pressure pocket is H and a radial width of the bearing protrusion portion is T.

14. The compressor of claim 13 , wherein the main bearing includes an inner opening configured to receive the rotation shaft, and the main bearing back pressure pocket is separated from the inner opening by an axially extending bearing protrusion portion.

15. The compressor of claim 14 , further including a generally cylindrical oil flow passage extending axially within the rotation shaft.

16. The compressor of claim 15 , further including a flow passage fluidly coupling the main bearing back pressure pocket with the oil flow passage within the rotation shaft.

17. The compressor of claim 15 , wherein the flow passage includes a radial slot in the bearing protrusion portion, the radial slot extending between the main bearing back pressure pocket and the oil flow passage within the rotation shaft.

18. The compressor of claim 13 , wherein L−H≥2 mm when a portion defining a compression space on the main bearing or the sub bearing is referred to as a flange portion and a thickness of the flange portion is L.

19. The compressor of claim 18 , wherein the bearing protrusion portion is formed to have a same axial depth and a radial width along the circumferential direction.

20. A vane rotary compressor, comprising:
a cylinder;
a main bearing and a sub bearing coupled to the cylinder, the main bearing and the sub bearing forming a compression space t

Assignees

• Lg Electronics Inc

Inventors

• Park Joonhong
• Kang Seoungmin
• Choi Seheon

Classifications

• F04C18/344 Primary

  with vanes reciprocating with respect to the inner member · CPC title

• F01C21/0872

  the fluid being other than the working fluid · CPC title

• F04C2240/603

  with internal channels for fluid distribution, e.g. hollow shaft · CPC title

• F04C2240/56

  Bearing bushings or details thereof · CPC title

• F04C2210/268

  R32 · CPC title