Rotary compressor

Patent metadata

Field	Value
Publication number	US-12305642-B2
Application number	US-202218714172-A
Country	US
Kind code	B2
Filing date	Jul 5, 2022
Priority date	Nov 30, 2021
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

In a rotary compressor, at least any one of a main bearing or a sub-bearing may have at least one axial-direction support portion that extends from an outer circumferential surface of a back pressure pocket and is formed to have a predetermined depth. The compressor may increase an oil film pressure that supports a roller in an axial direction thereof to stably support the roller including a rotational shaft in the axial direction, thereby effectively suppressing or preventing friction loss and abrasion between the roller and the main bearing facing the roller and between the roller and the sub-bearing.

First claim

The invention claimed is:

1. A rotary compressor, comprising:
a casing;
a cylinder that is disposed in an inner space of the casing to define a compression space;
a roller that is disposed on a rotational shaft and configured to be rotatable in the inner space of the cylinder;
at least one vane that is slidably inserted into at least one vane slot formed in the roller to rotate together with the roller; and
a main bearing and a sub bearing respectively disposed on both sides of the cylinder in an axial direction to define the compression space together with the cylinder, wherein at least one of the main bearing or the sub bearing has at least one back pressure pocket formed at a predetermined depth in a sliding surface facing an axial side surface of the roller, wherein at least one axial support portion that extends from an outer circumferential surface of the at least one back pressure pocket is formed at a predetermined depth in the sliding surface, and wherein a circumferential length of the at least one axial support portion is shorter than a circumferential length of the at least one back pressure pocket.

2. The rotary compressor of claim 1 , wherein an axial depth of the at least one axial support portion is shallower than an axial depth of the at least one back pressure pocket.

3. The rotary compressor of claim 1 , wherein the at least one axial support portion comprises a plurality of axial support portions provided along a circumferential direction of the roller, and wherein the plurality of axial support portions is formed with equal gaps therebetween along the circumferential direction of the roller.

4. The rotary compressor of claim 1 , wherein the at least one axial support portion comprises a plurality of axial support portions provided along a circumferential direction of the roller, and wherein at least some of the plurality of axial support portions is formed with different gaps therebetween along the circumferential direction of the roller.

5. The rotary compressor of claim 4 , wherein the at least one back pressure pocket includes a high-pressure side back pressure pocket and a low-pressure side back pressure pocket spaced apart from each other in the circumferential direction, and wherein a first gap between axial support portions of the plurality of axial support portions extending from the high-pressure side back pressure pocket is narrower than a second gap between axial support portions of the plurality of axial support portions extending from the low-pressure side back pressure pocket.

6. The rotary compressor of claim 1 , wherein the at least one axial support portion comprises a plurality of axial support portions disposed along a circumferential direction of the roller, and wherein the plurality of axial support portions have a same cross-sectional area along the circumferential direction of the roller.

7. The rotary compressor of claim 1 , wherein the at least one axial support portion comprises a plurality of axial support portions disposed along a circumferential direction of the roller, and wherein at least some of the plurality of axial support portions have different cross-sectional areas in the circumferential direction of the roller.

8. The rotary compressor of claim 7 , wherein the at least one back pressure pocket includes a high-pressure side back pressure pocket and a low-pressure side back pressure pocket spaced apart from each other in the circumferential direction, wherein the at least one axial support portion comprises a plurality of axial support portions and wherein a second cross-sectional area of at least one axial support portion of the plurality of axial support portions extending from the high-pressure side back pressure pocket is smaller than a first cross-sectional area of at least one axial support portion of the plurality of axial support portions extending from the low-pressure side back pressure pocket.

9. The rotary compressor of claim 1 , wherein a back pressure chamber is further defined in the roller and extends from the at least one vane slot to overlap the at least one back pressure pocket in the axial direction, wherein a width of the back pressure chamber is wider than a width of the at least one vane slot, and wherein the at least one back pressure pocket is formed such that an outer circumferential surface thereof passes between the at least one vane slot and the at least one back pressure chamber.

10. The rotary compressor of claim 1 , wherein the at least one axial support portion includes lateral surfaces in a circumferential direction, an outer surface that connects a first end of each of the lateral surfaces, and an inner surface that connects a second end of each of the lateral surfaces, wherein the lateral surfaces and the outer surface are stepped, wherein the inner surface is open to an outer circumferential surface of the at least one back pressure pocket to communicate with the at least one back pressure pocket, and wherein both of the lateral surfaces are formed in a linear shape.

11. The rotary compressor of claim 1 , wherein the at least one axial support portion includes lateral surfaces in a circumferential direction, an outer surface that connects a first end of each of the lateral surfaces, and an inner surface that connects a second end of each of the lateral surfaces, wherein the lateral surfaces and the outer surface are stepped, wherein the inner surface is open to an outer circumferential surface of the at least one back pressure pocket to communicate with the at least one back pressure pocket, and wherein both of the lateral surfaces are formed in a curved shape.

12. The rotary compressor of claim 1 , wherein the at least one axial support portion is inclined inward with respect to a rotational direction of the roller.

13. The rotary compressor of claim 1 , wherein the at least one axial support portion is inclined outward with respect to a rotational direction of the roller.

14. The rotary compressor of claim 1 , wherein the at least one axial support portion extends in a radial direction with respect to a center of the roller.

15. A rotary compressor, comprising:
a casing;
a cylinder that is disposed in an inner space of the casing to define a compression space;
a roller that is disposed on a rotational shaft and configured to be rotatable in the inner space of the cylinder;
at least one vane that is slidably inserted into at least one vane slot formed in the roller to rotate together with the roller; and
a main bearing and a sub bearing respectively disposed on both sides of the cylinder in an axial direction to define the compression space together with the cylinder, wherein at least one of the main bearing or the sub bearing has at least one back pressure pocket formed at a predetermined depth in a sliding surface facing an axial side surface of the roller, and wherein a plurality of axial support portions is formed in the sliding surface, each of the plurality of axial support potions being a groove that extends from an outer circumferential surface of the at least one back pressure pocket.

16. The rotary compressor of claim 15 , wherein a circumferential length of each of the groove is shorter than a circumferential length of the at least one back pressure pocket.

17. The rotary compressor of claim 15 , wherein an axial depth of each of the groove is shallower than an axial depth of the at least one back pressure pocket.

18. The rotary compressor of claim 15 , wherein the plurality of axial support portions is formed with equal gaps therebetween along the circumfere

Assignees

• Lg Electronics Inc

Inventors

• Lee Minho
• Choi Yongkyu
• Sa Bumdong

Classifications

• F04C2240/50

  Bearings · CPC title

• F04C29/028

  Means for improving or restricting lubricant flow · CPC title

• F04C29/02

  Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D) · CPC title

• F04C2240/54

  Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors · CPC title

• F04C29/0028

  Internal leakage control · CPC title