Rotary compressor with roller oil groove

Patent metadata

Field	Value
Publication number	US-11313367-B2
Application number	US-202016880158-A
Country	US
Kind code	B2
Filing date	May 21, 2020
Priority date	Jul 24, 2019
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A rotary compressor includes a roller that is provided with oil grooves concavely formed in a centrifugal direction from an inner circumferential surface of the roller facing an eccentric portion. The oil grooves are disposed at positions not overlapping an intake and a discharge port in an axial direction.

First claim

What is claimed is:

1. A rotary compressor comprising:
a cylinder axially extending between a first axial end and a second axial end and defining a compression space;
a ring-shaped roller received in the cylinder and configured to compress a substance in the compression space;
a vane connected to the roller and configured to divide the compression space into a suction chamber and a compression chamber;
a shaft including an eccentric portion configured to engage with an inner circumference of the roller, wherein the eccentric portion is configured to, based on rotation of the shaft, eccentrically rotate to revolve the roller around the shaft;
a first member disposed at the first axial end of the cylinder and including an intake port fluidly connected to the suction chamber; and
a second member disposed at the second axial end of the cylinder and including a discharge port fluidly connected to the compression chamber,
wherein the roller includes at least one oil groove that is defined at the inner circumference of the roller and faces the eccentric portion,
wherein the at least one oil groove is spaced apart from, in a circumferential direction, the intake port of the first member and the discharge port of the second member,
wherein the at least one oil groove is defined at a first axial end of the roller, and
wherein the at least one oil groove is recessed from the first axial end of the roller by a predetermined depth such that the eccentric portion does not extend axially beyond an axial end of the at least one oil groove.

2. The rotary compressor of claim 1 , wherein the at least one oil groove has a first end and a second end and extends between the first end and the second end along the inner circumference of the roller.

3. The rotary compressor of claim 2 , wherein a first virtual line extends between a rotation axis of the shaft and the vane and lies on a virtual plane that is perpendicular to the rotation axis,
wherein a second virtual line extends between the rotation axis of the shaft and the intake port and lies on the virtual plane,
wherein a third virtual line extends between the rotation axis of the shaft and the discharge port and lies on the virtual plane,
wherein a fourth virtual line extends between the rotation axis of the shaft and the first end of the at least one oil groove and lies on the virtual plane,
wherein a fifth virtual line extends between the rotation axis of the shaft and the second end of the at least one oil groove and lies on the virtual plane,
wherein a first angle is defined between the first virtual line and the second virtual line in a first angular direction,
wherein a second angle is defined between the first virtual line and the third virtual line in the first angular direction,
wherein a third angle is defined between the fourth virtual line and the rotation axis of the shaft in the first angular direction,
wherein a fourth angle is defined between the fifth virtual line and the rotation axis of the shaft in the first angular direction, and
wherein each of the third angle and the fourth angle has a value that ranges between a first value of the first angle and a second value of the second angle.

4. The rotary compressor of claim 3 , wherein the second virtual line extends between the rotation axis of the shaft and an end of the intake port that is farthest from the first virtual line, and
wherein the third virtual line extends between the rotation axis of the shaft and an end of the discharge port that is farthest from the first virtual line.

5. The rotary compressor of claim 3 , wherein the first value of the first angle ranges from 0 to 50°, and
wherein the second value of the second angle ranges from 310 to 360°.

6. The rotary compressor of claim 5 , wherein the value of each of the third angle and the fourth angle ranges from 50 to 310°.

7. The rotary compressor of claim 6 , wherein the first angle is greater than or equal to a first subtraction value of subtracting the second angle from 360, and
wherein the third angle is greater than or equal to the first angle and smaller than a second subtraction value of subtracting the first angle from 360.

8. The rotary compressor of claim 7 , wherein the fourth angle is greater than the third angle and smaller than or equal to the second value.

9. The rotary compressor of claim 8 , wherein the at least one oil groove is defined as continuously extending along the inner circumference of the roller in a range between the first angle and the second subtraction value.

10. The rotary compressor of claim 3 , wherein the at least one oil groove is symmetrically positioned with respect to the first virtual line.

11. The rotary compressor of claim 1 , wherein the at least one oil groove is at least one first oil groove, and
wherein the roller includes at least one second oil groove defined at a second axial end of the roller that is axially opposite to the first axial end of the roller.

12. The rotary compressor of claim 11 , wherein the at least one first oil groove and the at least one second oil groove are symmetrically positioned with respect to the rotation axis of the roller.

13. The rotary compressor of claim 11 , wherein the at least one first oil groove has a first oil accommodation space defined by the first member and the at least one first oil groove,
wherein the at least second oil groove has a second oil accommodation space defined by the second member and the at least one second oil groove, and
wherein each of the first and second oil accommodation spaces is fluidly connected to a gap between the inner circumference of the roller and an outer circumference of the eccentric portion.

14. The rotary compressor of claim 1 , wherein the at least one oil groove has an oil accommodation space defined by the first member and the at least one oil groove, and
wherein the oil accommodation space is fluidly connected to a gap between the inner circumference of the roller and an outer circumference of the eccentric portion.

15. The rotary compressor of claim 1 , wherein the at least one oil groove includes a C-shape having opposite ends that are circumferentially spaced from each other along the inner circumference of the roller.

16. The rotary compressor of claim 1 , wherein the first member is a plate that covers the first axial end of the cylinder.

17. The rotary compressor of claim 16 , wherein the second member is a bearing that covers the second axial end of the cylinder.

18. The rotary compressor of claim 1 , wherein the cylinder includes a vane slot, the vane at least partially inserted in the vane slot and configured to linearly move along the vane slot to divide the compression space into the suction chamber and the compression chamber.

Assignees

• Lg Electronics Inc

Inventors

• Kim Ki Sun
• Lee Sangha
• Lee Jaeyeol

Classifications

• F04C29/02

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

• F04C18/324 Primary

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

• F04C18/356 Primary

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

• F01C21/08

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

• F04C18/3564

  the surfaces of the inner and outer member, forming the working space, being surfaces of revolution · CPC title