Rotary compressor with wear avoiding portion

Patent metadata

Field	Value
Publication number	US-11428223-B2
Application number	US-202016838285-A
Country	US
Kind code	B2
Filing date	Apr 2, 2020
Priority date	May 17, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A rotary compressor may include a rotary shaft; a plurality of plates that supports the rotary shaft; a cylinder provided between the plurality of plates to define a compression space, and provided with a vane slot; a roller slidably coupled to the rotary shaft inside of the cylinder, and having a hinge groove on an outer circumferential surface thereof; and a vane, a first end which is slidably coupled to the vane slot of the cylinder, and a second end of which is rotatably coupled to the hinge groove of the roller. At least one of axial end surfaces of the roller facing the plurality of plates is provided with a wear avoiding portion having a predetermined depth. Contact surfaces between the roller and the plate may be suppressed from being in close contact with each other to suppress the roller or the plate from being damaged or a performance of the compressor due to friction loss from being deteriorated, thereby improving reliability and performance of the compressor.

First claim

What is claimed is:

1. A rotary compressor, comprising:
a rotary shaft;
a plurality of plates that supports the rotary shaft;
a cylinder provided between the plurality of plates to define a compression space, and provided with a vane slot;
a roller slidably coupled to the rotary shaft inside of the cylinder, and having a hinge groove on an outer circumferential surface thereof; and
a vane, a first end which is slidably coupled to the vane slot of the cylinder, and a second end of which is rotatably coupled to the hinge groove of the roller, wherein at least one axial end surface of the roller facing the plurality of plates is provided with a wear avoiding portion having a predetermined depth, and wherein the wear avoiding portion connects the at least one axial end surface of the roller and an inner circumferential surface of the hinge groove.

2. The rotary compressor of claim 1 , wherein the wear avoiding portion connects the at least one axial end surface of the roller and the outer circumferential surface of the roller.

3. The rotary compressor of claim 1 , wherein a radial depth of the wear avoiding portion is smaller than or equal to a radial depth of the hinge groove.

4. The rotary compressor of claim 1 , wherein an axial height of the outer circumferential surface of the roller is defined such that a first height at a portion at which the wear avoiding portion is disposed is lower than a second height at a portion at which the wear avoiding portion is not disposed.

5. The rotary compressor of claim 4 , wherein an axial depth of the wear avoiding portion is defined such that a center depth adjacent to the hinge groove is larger than an end depth away from the hinge groove.

6. The rotary compressor of claim 4 , wherein the wear avoiding portion is inclined or stepped in a circumferential direction of the roller.

7. The rotary compressor of claim 1 , wherein the wear avoiding portion is provided at both axial end surfaces of the roller, respectively.

8. The rotary compressor of claim 7 , wherein the wear avoiding portions disposed at both axial end surfaces of the roller are symmetrical to each other with respect to an axial center of the roller.

9. The rotary compressor of claim 1 , wherein a maximum avoidance gap between the roller and a respective plate of the plurality of plates is greater than or equal to a maximum tilting gap between the rotary shaft and the roller.

10. The rotary compressor of claim 1 , wherein when a line passing through a center of the roller and through a center of the hinge groove is referred to as a first imaginary line, and a line passing through the center of the roller and orthogonal to the first imaginary line is referred to as a second imaginary line, and an axial plane of the roller is divided into four quadrants by the first imaginary line and the second imaginary line, the wear avoiding portion is disposed within a range of a quadrant adjacent to the hinge groove.

11. The rotary compress of claim 10 , wherein when a portion of the roller that belongs to one quadrant adjacent to the hinge groove with respect to the hinge groove is referred to as a first portion, and a portion of the roller that belongs to another quadrant adjacent thereto is referred to as a second portion, the wear avoiding portion is disposed at a portion belonging to a space having a higher pressure between the first portion and the second portion.

12. A rotary compressor, comprising:
a rotary shaft;
a plurality of plates that supports the rotary shaft and having thrust surfaces;
a cylinder provided between the plurality of plates to define a compression space, and provided with a vane slot;
a roller coupled to the rotary shaft, axial end surfaces of which respectively define sealing surfaces slidably brought into contact with the thrust surfaces of the plurality of plates;
a vane, a first end of which is slidably coupled to the vane slot of the cylinder, and a second end of which is hinge-coupled to the roller, and a first circumferential side of which defines a space having a suction pressure, and a second circumferential side of which defines a space having a discharge pressure;
a wear avoiding portion disposed on at least one of the sealing surfaces of the roller or disposed on the thrust surface of at least one of the plurality of plates, wherein at least a portion of the wear avoiding portion includes a space having the discharge pressure, wherein a discharge port is disposed on one of the plurality of plates, and the wear avoiding portion is disposed on both of the sealing surfaces of the roller, respectively, and wherein an axial depth of a first wear avoiding portion, of the wear avoiding portions, disposed on a first sealing surface, of the sealing surfaces, at a side facing the one of the plurality of plates having the discharge port is greater than or equal to an axial depth of a second wear avoiding portion, of the wear avoiding portions, disposed on a second sealing surface, of the sealing surfaces, at an opposite side thereof.

13. The rotary compressor of claim 12 , wherein the wear avoiding portions are disposed on the one of the plurality of plates having the discharge port, and the wear avoiding portions communicate with the discharge port.

14. A rotary compressor, comprising:
a rotary shaft;
a plurality of plates that supports the rotary shaft;
a cylinder provided between the plurality of plates to define a compression space, and provided with a vane slot;
a roller slidably coupled to the rotary shaft inside of the cylinder, and having a hinge groove on an outer circumferential surface thereof; and
a vane, a first end which is slidably coupled to the vane slot of the cylinder, and a second end of which is rotatably coupled to the hinge groove of the roller, wherein at least one axial end surface of the roller facing the plurality of plates is provided with a wear avoiding portion in the form of an inclined or stepped cut out provided at an outer circumferential edge of the roller adjacent the hinge groove, wherein the wear avoiding portion is provided at both axial end surfaces of the roller, respectively, and wherein the wear avoiding portions disposed at both axial end surfaces of the roller are symmetrical to each other with respect to an axial center of the roller.

15. The rotary compressor of claim 14 , wherein the wear avoiding portion connects the at least one axial end surface of the roller and an inner circumferential surface of the hinge groove.

16. The rotary compressor of claim 14 , wherein a radial depth of the wear avoiding portion is smaller than or equal to a radial depth of the hinge groove.

Assignees

• Lg Electronics Inc

Inventors

• Lee Jingyu
• Kim Hyeongseok
• Sung Yonghyeon

Classifications

• F01C21/08

  Rotary pistons (reciprocating pistons in general F16J) · CPC title

• F04C18/324 Primary

  with vanes hinged to the inner member and reciprocating with respect to the outer member · CPC title

• F05B2210/14

  Refrigerants with particular properties, e.g. HFC-134a · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C2270/16

  Wear · CPC title