Compressor having a lubrication surface formed on a roller thereof

Patent metadata

Field	Value
Publication number	US-10718331-B2
Application number	US-201515506448-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Sep 19, 2014
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

Disclosed is a compressor. A lubrication surface, which has the same curvature as an inner circumferential surface curvature of a cylinder and which has a predetermined circumference length, is formed on an outer circumferential surface of a roller contacting an inner circumferential surface of the cylinder. With such a configuration, since the outer circumferential surface of the roller contacting the inner circumferential surface of the cylinder come in surface-contact with each other, an oil film is formed between the roller and the cylinder with a wide area. This can reduce a frictional loss.

First claim

The invention claimed is:

1. A compressor, comprising:
a driving motor;
a rotational shaft configured to transmit a rotational force of the driving motor;
a cylinder installed at one side of the driving motor;
a roller having an outer circumferential surface contacting an inner circumferential surface of the cylinder, rotated by the rotational shaft, and concentric with the cylinder; and
at least two vanes movably provided at the cylinder, contacting the outer circumferential surface of the roller, and configured to divide at least two compression spaces formed by the cylinder and the roller into a suction chamber and a compression chamber, wherein the roller includes a lubrication surface provided on the outer circumferential surface of the roller in surface-contact with the inner circumferential surface of the cylinder, wherein the lubrication surface has a same radius from a rotation center of the roller and is formed on both sides of a line passing through the rotation center of the roller and two points on a long axis of an ellipse in a circumferential direction, wherein the roller includes a plurality of compression surfaces provided on the outer circumferential surface of the roller spaced apart from the inner circumferential surface of the cylinder to form the compression chamber, wherein an increase portion having a distance sum of distances from two points located at a same distance on both sides of the line passing through the rotation center of the roller to an arbitrary point on the outer circumferential surface of the roller being gradually increased, and a decrease portion extending from the increase portion and having the distance sum being gradually decreased to the distance sum of the two points that make up the ellipse, are formed on the outer circumferential surface of the roller, and wherein the distance sums that are measured on the outer circumferential surface of the roller starting at a location closer to the minor axis are compared to the distance sums that are measured closer toward the major axis.

2. The compressor of claim 1 , wherein the increase portion is formed such that a distance from the rotation center of the roller to an outer circumferential surface of the increase portion is shorter than a radius of the cylinder.

3. The compressor of claim 2 , wherein the distance from the rotation center of the roller to the outer circumferential surface of the increase portion is gradually increased toward the decrease portion.

4. The compressor of claim 1 , wherein a distance from the rotation center of the roller to an outer circumferential surface of the decrease portion is formed to be the same for at least a portion of the decrease portion.

5. The compressor of claim 4 , wherein the distance from the rotation center of the roller to the outer circumferential surface of the decrease portion is formed to be the same as a radius of the cylinder.

6. The compressor of claim 1 , wherein a connection portion is formed between the increase portion and the decrease portion, and wherein the connection portion is formed to have a curved surface having a common tangent to the increase portion and the decrease portion at the connection portion.

7. The compressor of claim 1 , wherein assuming that a half circumference angle of a contact section of the roller contacting the inner circumferential surface of the cylinder, among the outer circumferential surface of the roller, is D and a circumference angle between a central part of the vane in a lengthwise direction and a compression starting angle is C, the half circumference angle of the contact section satisfies a formula, D≤C.

8. The compressor of claim 1 , wherein a suction opening is formed at one side of the vane in a circumferential direction, and wherein a circumference length of a contact section of the roller contacting the inner circumferential surface of the cylinder, among the outer circumferential surface of the roller, is formed to be equal to or smaller than two times of a circumference length from a central part of the vane in a lengthwise direction to a farthest part of the suction opening from the vane.

9. The compressor of claim 1 , wherein an oil passage is formed at the rotational shaft, and wherein an oil hole, which communicates with the oil passage and extends to the lubrication surface of the roller contacting the inner circumferential surface of the cylinder, is formed at the roller, and wherein the oil hole extends from the oil passage to the lubrication surface.

10. The compressor of claim 1 , wherein the roller includes at least two wing portions formed to extend in a radial direction on the basis of the rotational shaft, wherein the lubrication surface is formed on an outer circumferential surface of each of the at least two wing portions, and wherein the lubrication surfaces of the at least two wing portions are connected to each other by straight lines.

11. A compressor, comprising:
a driving motor;
a rotational shaft configured to transmit a rotational force of the driving motor;
a cylinder installed at one side of the driving motor;
a roller having an outer circumferential surface contacting an inner circumferential surface of the cylinder, rotated by the rotational shaft, and concentric with the cylinder; and
at least two vanes movably provided at the cylinder, contacting an outer circumferential surface of the roller, and configured to divide at least two compression spaces formed by the cylinder and the roller into a suction chamber and a compression chamber, wherein the roller includes:
a first curved surface spaced from the inner circumferential surface of the cylinder, wherein the first curved surface has a sum of distances from two points on a line passing through a rotation center of the roller to the outer circumferential surface of the roller being increased, formed on the outer circumferential surface of the roller, and wherein the distance sums that are measured on the outer circumferential surface of the roller starting at a location closer to the minor axis and are compared to the distance sums that are measured closer toward the major axis; and
a second curved surface contacting the inner circumferential surface of the cylinder, wherein the second surface has a sum of distances from two points on a line passing through a rotation center of the roller to the outer circumferential surface of the roller is decreased, formed on the outer circumferential surface of the roller, wherein the distance sums that are measured on the outer circumferential surface of the roller starting at a location closer to the minor axis and are compared to the distance sums that are measured closer toward the major axis, and wherein a curvature radius of the second curved surface is formed to be equal to a curvature radius of the inner circumferential surface of the cylinder.

12. The compressor of claim 11 , wherein an oil passage is formed at the rotational shaft, and wherein an oil hole, which communicates with the oil passage toward the outer circumferential surface of the roller contacting the inner circumferential surface of the cylinder, is formed at the roller.

13. A compressor, comprising:
a driving motor;
a rotational shaft configured to transmit a rotational force of the driving motor;
a cylinder installed at one side of the driving motor;
a roller having an outer circumferential surface contacting an inner circumferential surface of the cylinder, rotated by the rotational shaft, and concentric with the cylinder; and
at least two vanes movably provided at the cylinder, contacting an outer circumferential surface of the roller, and configured to divide at l

Assignees

• Lg Electronics Inc

Inventors

• Moon Seokhwan
• Lee Yunhi
• Lee Byeongchul

Classifications

• F04C23/008

  Hermetic pumps · CPC title

• F04C2250/20

  of the rotor · CPC title

• F04C29/028

  Means for improving or restricting lubricant flow · CPC title

• F04C18/3566 Primary

  the inner and outer member being in contact along more than line or surface · CPC title

• F04C29/023

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title