Rotary compressor

Patent metadata

Field	Value
Publication number	US-12253083-B2
Application number	US-202117926210-A
Country	US
Kind code	B2
Filing date	Apr 15, 2021
Priority date	May 22, 2020
Publication date	Mar 18, 2025
Grant date	Mar 18, 2025

Abstract

A rotary compressor is provided that may include a cylinder; a chamber eccentrically formed in the cylinder and accommodating a predetermined working fluid; a rotor rotatably received in the chamber and arranged so as to be concentric to the cylinder; first and second bearings disposed on upper and lower portions, respectively, of the cylinder so as to close the chamber, and which support a drive shaft of the rotor; a plurality of vanes movably installed on the rotor in a radial direction thereof, and protruding from the rotor up to an inner circumferential surface of the cylinder so as to divide the chamber into a plurality of compression spaces; first and second guide grooves which, in order to accommodate a portion of the vanes, are formed on respective surfaces, facing the chamber, of the first and second bearings so as to be concentric to the chamber, and guide the plurality of vanes while the rotor is rotating so that the plurality of vanes continuously protrude up to the inner circumferential surface of the cylinder; and an auxiliary bearing which is provided in at least one of the first guide groove or the second guide groove and rotating with the plurality of vanes.

First claim

The invention claimed is:

1. A rotary compressor, comprising:
a cylinder;
a chamber eccentrically formed in the cylinder and accommodating a predetermined working fluid;
a rotor rotatably disposed in the chamber and disposed concentrically to the cylinder;
first and second bearings that are disposed above and below the cylinder to seal the chamber, respectively and support a drive shaft of the rotor;
a plurality of vanes movably installed in the rotor in a radial direction of the rotor and protruding to an inner circumferential surface of the cylinder from the rotor to divide the chamber into a plurality of compressed spaces;
first and second guide grooves formed concentrically to the chamber on surfaces of the first and second bearings facing the chamber, to accommodate portions of the plurality of vanes and continuously guiding the plurality of vanes to protrude to the inner circumferential surface of the cylinder while the rotor rotates; and
an auxiliary bearing provided in at least one of the first guide groove or the second guide groove and rotating with the plurality of vanes, wherein the auxiliary bearing further includes a cover that isolates the auxiliary bearing from the chamber.

2. The rotary compressor of claim 1 , wherein the auxiliary bearing includes:
an outer ring fixed in the at least one of the first guide groove or the second guide groove; and
an inner ring in contact with the portions of the plurality of vanes and rotating relative to the outer ring with the portions of the plurality of vanes.

3. The rotary compressor of claim 2 , wherein the auxiliary bearing further includes a rolling member disposed between the outer ring and the inner ring.

4. The rotary compressor of claim 1 , wherein the cover entirely covers a surface of the auxiliary bearing facing the chamber.

5. The rotary compressor of claim 1 , wherein the auxiliary bearing is accommodated in the at least one of the first guide groove or the second guide groove so as not to protrude from the at least one of the first guide groove or the second guide groove.

6. The rotary compressor of claim 1 , wherein the auxiliary bearing is disposed to overlap the rotor in an axial direction.

7. The rotary compressor of claim 6 , wherein a width of an overlap region of the auxiliary bearing and the rotor is set to at least 1.5 mm.

8. The rotary compressor of claim 2 , wherein each of the plurality of vanes includes:
a body including a first end portion elongated in a radial direction of the rotor and disposed in the rotor, and a second end portion adjacent to an inner circumferential surface of the cylinder; and
a pin that extends from the first end portion of the body and inserted into the at least one of the first guide groove or the second guide groove to contact the auxiliary bearing.

9. The rotary compressor of claim 8 , wherein the pin contacts the inner ring of the auxiliary bearing.

10. The rotary compressor of claim 8 , wherein the pin is fixed to the inner ring of the auxiliary bearing.

11. The rotary compressor of claim 8 , wherein the pin is integrally formed with the body or detachably installed on the body.

12. The rotary compressor of claim 8 , wherein a lubricating member having a low friction coefficient is disposed in the first and second guide grooves.

13. A rotary compressor, comprising:
a cylinder;
a chamber eccentrically formed in the cylinder and accommodating a predetermined working fluid;
a rotor rotatably disposed in the chamber and disposed concentrically to the cylinder;
first and second bearings that are disposed above and below the cylinder to seal the chamber, respectively and support a drive shaft of the rotor;
a plurality of vanes movably installed in the rotor in a radial direction of the rotor and protruding to an inner circumferential surface of the cylinder from the rotor to divide the chamber into a plurality of compressed spaces;
first and second guide grooves formed concentrically to the chamber on surfaces of the first and second bearings facing the chamber, to accommodate portions of the plurality of vanes and continuously guiding the plurality of vanes to protrude to the inner circumferential surface of the cylinder while the rotor rotates; and
an auxiliary bearing provided in each of the first guide groove and the second guide groove and rotating with the plurality of vanes, wherein the auxiliary bearing includes:
an outer ring fixed in the respective first guide groove or second guide groove; and
an inner ring in contact with the portions of the plurality of vanes and rotating relative to the outer ring with the portions of the plurality of vanes, wherein the auxiliary bearing further includes a cover that isolates the auxiliary bearing from the chamber.

14. The rotary compressor of claim 13 , wherein the auxiliary bearing further includes a rolling member disposed between the outer ring and the inner ring.

15. The rotary compressor of claim 13 , wherein the cover entirely covers a surface of the auxiliary bearing facing the chamber.

16. The rotary compressor of claim 13 , wherein the auxiliary bearing is accommodated in the respective first guide groove or second guide groove so as not to protrude from the respective first guide groove or second guide groove.

17. The rotary compressor of claim 13 , wherein the auxiliary bearing is disposed to overlap the rotor in an axial direction.

18. The rotary compressor of claim 13 , wherein each of the plurality of vanes includes:
a body including a first end portion elongated in a radial direction of the rotor and disposed in the rotor, and a second end portion adjacent to an inner circumferential surface of the cylinder; and
a pin that extends from the first end portion of the body and inserted into the respective first guide groove or second guide groove to contact the auxiliary bearing.

19. The rotary compressor of claim 18 , wherein a lubricating member having a low friction coefficient is disposed in each of the first and second guide grooves.

Assignees

• Lg Electronics Inc

Inventors

• Sa Bumdong
• Seol Seseok
• Moon Seokhwan

Classifications

• F04C2240/50

  Bearings · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C2210/12

  auxiliary · CPC title

• F05B2210/12

  gaseous, i.e. compressible · CPC title

• F05B2210/14

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