Scroll compressor

• US 9,759,216 B2
• Filed: 09/27/2013
• Issued: 09/12/2017
• Est. Priority Date: 09/27/2012
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Kato, Katsumi
• Primary Examiner(s): Laurenzi, Mark
• Assistant Examiner(s): HARRIS, WESLEY G
• Application Number:
  US14/431,712
• Publication Number:
  US 20150260189A1
• Time in Patent Office: 1,446 Days
• Field of Search: 418 556, 418 551, 418 94, 418 552
• CPC Class Codes: F01C 17/066 with an intermediate piece sliding along perpendicular axes, e.g. Oldham coupling
• CPC Class Codes: F01C 21/10 Outer members for co-operation with rotary pistons; Casings casings for rotary engines or machines in general F16M
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 18/0253 Details concerning the base
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/02 Lubrication of machines or engines in general F01M; Lubricant separation separation in general B01D
• CPC Class Codes: F04C 29/023 Lubricant distribution through a hollow driving shaft F04C29/025 takes precedence
• CPC Class Codes: F04C 29/026 Lubricant separation
• CPC Class Codes: F04C 29/028 Means for improving or restricting lubricant flow
• CPC Class Codes: F25B 31/004 oil recirculating arrangements

Abstract

A scroll compressor includes fixed and movable scrolls, and a drive part. The fixed scroll has a fixed-side end plate, a fixed-side lap, and a thrust sliding portion surrounding the first lap. The movable scroll has a movable-side end plate and a movable-side lap. The drive part revolves the movable scroll so that refrigerant in a compression chamber formed by the fixed-side lap and movable-side lap is compressed. A back-pressure space which communicates with the compression chamber for at least a prescribed period in a revolution cycle is formed at the back face side of the movable scroll. A first oil channel supplied with oil from a space is formed in a first angle region of the fixed-side end plate. A communication channel formed in a second angle region communicates with the compression chamber. A second oil channel communicating with the back-pressure space is formed in the second angle region.

Claims

1. A scroll compressor comprising:

a fixed scroll having a tabular first end plate, a first spiraling lap protruding from a front face of the first end plate, and a thrust sliding portion surrounding the first spiraling lap;

a movable scroll having a tabular second end plate and a second spiraling lap protruding from a front face of the second end plate; and

a drive part linked to the movable scroll via a crankshaft, the drive part revolving the movable scroll,

the first spiraling lap and the second spiraling lap being brought together so that the front face of the first end plate and the front face of the second end plate face each other, and a compression chamber is formed between the first spiraling lap and the second spiraling lap adjacent to each other,

the drive part revolving the movable scroll cyclically so that a gaseous refrigerant in the compression chamber is compressed,

a back-pressure space formed at a back face side of the second end plate of the movable scroll, the back pressure space communicating with the compression chamber on a peripheral side for at least a first prescribed period in a revolution cycle of the movable scroll,

a communication hole formed in the second end plate, the communication hole communicating with the back-pressure space, and

on a sliding face contacting the front face of the second end plate for at least a second prescribed period in the revolution cycle of the movable scroll, in the thrust sliding portion facing the front face of the second end plate, there being formed

a first oil channel extending in an arc shape in a first angle region with respect to a center of the first end plate as seen in plan view, an oil being supplied to the first oil channel from a high-pressure space communicating with the compression chamber at high pressure and retained in the first oil channel,

a communication channel disposed in a second angle region, which is external to the first angle region, with respect to the center of the first end plate as seen in plan view, the communication channel communicating with the compression chamber, and, for at least a third prescribed period in the revolution cycle of the movable scroll, communicating with the communication hole, and

a second oil channel disposed in the second angle region with respect to the center of the first end plate as seen in plan view, the second oil channel communicating with the back-pressure space for at least a fourth prescribed period in the revolution cycle of the movable scroll.

2. The scroll compressor according to claim 1, wherein

the second oil channel extends radially a first distance and circumferentially a second distance with respect to the center of the first end plate as seen in plan view, and

the first distance is at least as large as the second distance.

3. The scroll compressor according to claim 2, wherein

the second oil channel is one of circular, ellipsoidal, rectangular, J-shaped, and L-shaped as seen in plan view.

4. The scroll compressor according to claim 1, wherein

the communication channel extends radially with respect to the center of the first end plate as seen in plan view and is formed into a J-shape that curves inwardly with respect to the center of the first end plate, and

the second oil channel extends radially towards the center of the first end plate as seen in plan view and is formed into a J-shape which curves outwardly with respect to the center of the first end plate.

5. The scroll compressor according to claim 1, wherein

at least part of the second oil channel is formed on a regular sliding face of the thrust sliding portion, the regular sliding face always contacting with the front face of the second end plate.

6. The scroll compressor according to claim 5, wherein

the first oil channel and the communication channel are formed on the regular sliding face.

7. The scroll compressor according to claim 1, wherein

the second oil channel always communicates with the back-pressure space.

8. The scroll compressor according to claim 1, wherein

the second oil channel includes a plurality of channels.

9. The scroll compressor according to claim 1, wherein

the second oil channel is at least partly formed in an intermittent sliding face of the thrust sliding portion, the intermittent sliding face intermittently contacting the front face of the second end plate when the movable scroll revolves with respect to the fixed scroll.

10. A scroll compressor comprising:

a fixed scroll having a tabular first end plate, a first spiraling lap protruding from a front face of the first end plate, and a thrust sliding portion surrounding the first spiraling lap;

a movable scroll having a tabular second end plate and a second spiraling lap protruding from a front face of the second end plate; and

a drive part linked to the movable scroll via a crankshaft, the drive part revolving the movable scroll,

the first spiraling lap and the second spiraling lap being brought together so that the front face of the first end plate and the front face of the second end plate face each other, and a compression chamber is formed between the first spiraling lap and the second spiraling lap adjacent to each other;

the drive part revolving the movable scroll cyclically so that a gaseous refrigerant in the compression chamber is compressed,

a back-pressure space formed at a back face side of the second end plate of the movable scroll, the back pressure space communicating with the compression chamber on a peripheral side for at least a first prescribed period in a revolution cycle of the movable scroll,

a communication hole formed in the second end plate, the communication hole communicating with the back-pressure space,

an oil introduction path formed in the fixed scroll, an oil supplied from a high-pressure space communicating with the compression chamber at high pressure flowing in the oil introduction path, and

on a sliding face contacting the front face of the second end plate for at least a second prescribed period in the revolution cycle of the movable scroll, in the thrust sliding portion facing the front face of the second end plate, there being formed

a first oil channel extending in an arc shape in a first angle region with respect to a center of the first end plate as seen in plan view, the oil being supplied to the first oil channel from the oil introduction path and retained in the first oil channel,

a communication channel disposed in a second angle region, that is external to the first angle region, with respect to the center of the first end plate as seen in plan view, the communication channel communicating with the compression chamber, and, for at least a third prescribed period in the revolution cycle of the movable scroll, communicating with the communication hole, and

a second oil channel disposed in the second angle region with respect to the center of the first end plate as seen in plan view, the second oil channel communicating with the back-pressure space for at least a fourth prescribed period in the revolution cycle of the movable scroll.

11. The scroll compressor according to claim 10, wherein

the second oil channel extends radially a first distance and circumferentially a second distance with respect to the center of the first end plate as seen in plan view, and

the first distance is at least as large as the second distance.

12. The scroll compressor according to claim 11, wherein

the second oil channel is one of circular, ellipsoidal, rectangular, J-shaped, and L-shaped as seen in plan view.

13. The scroll compressor according to claim 10, wherein

the communication channel extends radially with respect to the center of the first end plate as seen in plan view and is formed into a J-shape that curves inwardly with respect to the center of the first end plate, and

the second oil channel extends radially towards the center of the first end plate as seen in plan view and is formed into a J-shape which curves outwardly with respect to the center of the first end plate.

14. The scroll compressor according to claim 10, wherein

at least part of the second oil channel is formed on a regular sliding face of the thrust sliding portion, the regular sliding face always contacting with the front face of the second end plate.

15. The scroll compressor according to claim 14, wherein

the first oil channel and the communication channel are formed on the regular sliding face.

16. The scroll compressor according to claim 10, wherein

the second oil channel always communicates with the back-pressure space.

17. The scroll compressor according to claim 10, wherein

the second oil channel includes a plurality of channels.

18. The scroll compressor according to claim 10, wherein

the second oil channel is at least partly formed in an intermittent sliding face of the thrust sliding portion, the intermittent sliding face intermittently contacting the front face of the second end plate when the movable scroll revolves with respect to the fixed scroll.