Rotary compressor

Patent metadata

Field	Value
Publication number	US-11466686-B2
Application number	US-202117313107-A
Country	US
Kind code	B2
Filing date	May 6, 2021
Priority date	Jun 5, 2020
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A rotary compressor is provided that may include a roller slidingly coupled to an eccentric portion of a rotational shaft so as to be moved along an inner circumferential surface of a cylinder by the rotational shaft, and a vane slidingly coupled to the cylinder so as to divide the compression space into a plurality of compression chambers. An oil supply groove may be formed on an outer circumferential surface of the eccentric portion or an inner circumferential surface of the roller that faces the outer circumferential surface of the eccentric portion, and a depth of the oil supply groove may decrease as a distance in a circumferential direction from the second oil supply hole increases. Accordingly, an amount of oil supplied between the eccentric portion and the roller may be increased to thereby reduce friction loss.

First claim

What is claimed is:

1. A rotary compressor, comprising:
a plurality of bearing plates;
a cylinder provided between the plurality of bearing plates to form a compression space;
a rotational shaft including a shaft portion that penetrates through the plurality of bearing plates, an eccentric portion that is accommodated in the compression space of the cylinder, a first oil supply hole formed in the shaft portion, and a second oil supply hole that extends from the first oil supply hole to an outer circumferential surface of the eccentric portion;
a roller slidingly coupled to the eccentric portion of the rotational shaft so as to be moved along an inner circumferential surface of the cylinder by the rotational shaft; and
a vane slidingly coupled to the cylinder so as to divide the compression space into a plurality of compression chambers, wherein the outer circumferential surface of the eccentric portion or an inner circumferential surface of the roller that faces the outer circumferential surface of the eccentric portion is provided with an oil supply groove formed along a circumferential direction to communicate with the second oil supply hole, and wherein the oil supply groove is formed such that a depth of a portion thereof adjacent to the second oil supply hole is greater than a portion thereof positioned a predetermined distance away from the second oil supply hole, wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft, wherein the second oil supply groove portion is provided at a position excluding a maximum load point formed between the outer circumferential surface of the eccentric portion and the inner circumferential surface of the roller.

2. The compressor of claim 1 , wherein the second oil supply hole is located at an eccentric position with respect to a circumferential center of the oil supply groove.

3. The compressor of claim 1 , wherein a depth of the oil supply groove decreases as a distance in the circumferential direction from the second oil supply hole increases.

4. The compressor of claim 1 , wherein the second oil supply hole is located at a rear side of the oil supply groove with respect to a rotational direction of the rotational shaft.

5. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft, wherein the second oil supply groove portion is eccentric to one direction along the circumferential direction with respect to the second oil supply hole, and wherein a circumferential length of the second oil supply groove portion is greater than a circumferential length of the first oil supply groove portion.

6. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft, wherein the second oil supply groove portion is eccentric in one direction along the circumferential direction with respect to the second oil supply hole, and wherein a maximum depth of the second oil supply groove portion is less than a maximum depth of the first oil supply groove portion.

7. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft, wherein the second oil supply groove portion is eccentric to one direction along the circumferential direction with respect to the second oil supply hole, and wherein a circumferential surface of the second oil supply groove portion is curved in an arcuate shape, and a center of an arc of the second oil supply groove portion is eccentric with respect to a center of a circle of the eccentric portion.

8. The compressor of claim 7 , wherein the center of the arc of the second oil supply groove portion is located at an eccentric side of the eccentric portion rather than the center of the circle of the eccentric portion.

9. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove in a rotational direction of the rotational shaft, wherein the second oil supply groove portion is eccentric to one direction along the circumferential direction with respect to the second oil supply hole, and wherein a circumferential surface of the second oil supply groove portion is formed as at least one linear surface.

10. The compressor of claim 9 , wherein the circumferential surface of the second oil supply groove portion is formed as a plurality of linear surfaces, and wherein the plurality of linear surfaces is formed such that a linear surface in contact with the first oil supply groove portion has a largest surface angle and a linear surface located farthest from the first oil supply groove portion has a smallest surface angle.

11. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft, and wherein the second oil supply groove portion extends up to both axial sides of the eccentric portion and is open toward the plurality of bearing plates.

12. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated; and
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft, wherein the first oil supply groove portion extends up to at least one of both axial sides of the eccentric portion and is open toward the plurality of bearing plates facing each other, and wherein the second oil supply groove portion includes sealing surface portions that are respectively provided at both axial sides of the eccentric portion, an extended groove portion that extends in the circumferential direction between the sealing surface portions, and an open groove portion that extends from the extended groove portion and is open toward the plurality of bearing plates facing each other in an axial direction.

13. The compressor of claim 1 , wherein the oil supply groove comprises:
a first oil supply groove portion in which an end portion of the second oil supply hole is accommodated;
a second oil supply groove portion that extends from one end of the first oil supply groove portion in a rotational direction of the rotational shaft; and
at least one third oil supply groove portion that extends from the second oil supply groove portion in the circumferential direction, wherein a volume of the at least one third oil supply groove portion is less t

Assignees

• Lg Electronics Inc

Inventors

• Lee Jingyu
• Na Sangmin

Classifications

• F04C2240/60

  Shafts · CPC title

• F04C18/3443 Primary

  with a separation element located between the inlet and outlet opening · CPC title

• F04C15/0088

  Lubrication (of machines or engines in general F01M) · CPC title

• F04C23/008 Primary

  Hermetic pumps · CPC title

• F04C18/324 Primary

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