Scroll-type compressor

• US 6,932,586 B2
• Filed: 04/23/2003
• Issued: 08/23/2005
• Est. Priority Date: 05/16/2002
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Ohno, Takahiro, Furusho, Kazuhiro, Kato, Katsumi
• Primary Examiner(s): Trieu, Theresa
• Application Number:
  US10/495,270
• Publication Number:
  US 20040265159A1
• Time in Patent Office: 853 Days
• Field of Search: 418/55.5, 418/57, 418/55.4, 418/55.6
• US Class Current: 418/55.5
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 27/005 Axial sealings for working fluid
• CPC Class Codes: F04C 29/0021 Systems for the equilibration of forces acting on the pump interstice adjustment other than by fluid pressure F01C21/102
• CPC Class Codes: F04C 29/023 Lubricant distribution through a hollow driving shaft F04C29/025 takes precedence

Abstract

An adjusting mechanism (56) is provided to produce an anti-overturning moment to reduce an overturning moment acting on an orbiting scroll (26) during its revolution in a revolving-angle area in which the overturning moment becomes a certain value or more. Accordingly, revolution movement of the orbiting scroll (26) can be made stable by changing a pressing force of the orbiting scroll (26) against the fixed scroll (22) according to fluctuation of the overturning moment due to the revolution of the orbiting scroll (26), thereby improving the compression efficiency of a scroll-type compressor (1).

Claims

1. A scroll-type compressor comprising:

a fixed scroll that is fixed in a casing;

an orbiting scroll that engages with said fixed scroll;

a pressing part that presses said orbiting scroll against said fixed scroll in an axial direction; and

an adjusting mechanism that adjusts a pressing force of said orbiting scroll against said fixed scroll,

said adjusting mechanism being configured and arranged such that an anti-overturning moment to decrease an overturning moment acting on said orbiting scroll during revolution of said orbiting scroll is produced in a revolving-angle area of said orbiting scroll in which said overturning moment becomes at least a predetermined value.

2. The scroll-type compressor of claim 1, wherein

said adjusting mechanism is configured and arranged such that said anti-overturning moment acts in substantially an opposite direction to said overturning moment in said revolving-angle area of said orbiting scroll.

3. The scroll-type compressor of claim 2, wherein

said adjusting mechanism comprises an oil groove that is formed at a sliding face constituted between said fixed scroll and said orbiting scroll, and an oil-introduction passage that introduces a high-pressure oil into said oil groove, and

said oil groove is configured and arranged such that an acting point of a high pressure to said orbiting scroll is offset from a center of said orbiting scroll located in said revolving-angle area.

4. The scroll-type compressor of claim 3, wherein

said oil groove is formed in a circumferential ring shape and formed at one of said fixed scroll and said orbiting scroll in such a manner that a center of said oil groove is offset from said center of said orbiting scroll.

5. The scroll-type compressor of claim 3, wherein

said oil groove is configured and arranged such that an oil-pressure acting area at an acting side of said overturning moment is smaller than an oil-pressure acting area at an opposite acting side of said overturning moment relative to said center of said orbiting scroll.

6. The scroll-type compressor of claim 5, wherein

said oil groove is formed in a circumferential ring shape with a center of said oil groove being concentric to said orbiting scroll, and formed in such a manner that a portion thereof is disconnected at said acting side of said overturning moment.

7. The scroll-type compressor of claim 5, wherein

said oil groove is formed in a circumferential ring shape with a center of said oil groove being concentric to said orbiting scroll, and comprises a widened portion with an enlarged width at said opposite acting side of said overturning moment.

8. The scroll-type compressor of claim 1, wherein

said adjusting mechanism comprises an oil groove that is formed at a sliding face constituted between said fixed scroll and said orbiting scroll, and an oil-introduction passage that introduces a high-pressure oil into said oil groove, and

said oil groove configured and arranged such that an acting point of a high pressure to said orbiting scroll is offset from a center of said orbiting scroll located in said revolving-angle area.

9. The scroll-type compressor of claim 8, wherein

said oil groove is formed in a circumferential ring shape and formed at one of said fixed scroll and said orbiting scroll in such a manner that a center of said oil groove is offset from said center of said orbiting scroll.

10. The scroll-type compressor of claim 8, wherein

said oil groove is configured and arranged such that an oil-pressure acting area at an acting side of said overturning moment is smaller an oil-pressure acting area at an opposite acting side of said overturning moment relative to said center of said orbiting scroll.

11. The scroll-type compressor of claim 10, wherein

said oil groove is formed in a circumferential ring shape with a center of said oil groove being concentric to said orbiting scroll, and formed in such a manner that a portion thereof is disconnected at said acting side of said overturning moment.

12. The scroll-type compressor of claim 10, wherein

said oil groove is formed in a circumferential ring shape with a center of said oil groove being concentric to said orbiting scroll, and comprises a widened portion with an enlarged width at said opposite acting side of said overturning moment.

13. A scroll-type compressor comprising:

a fixed scroll that is fixed in a casing;

an orbiting scroll that engages with said fixed scroll;

a pressing part that presses said orbiting scroll against said fixed scroll in an axial direction; and

an adjusting mechanism that adjusts a pressing force of said orbiting scroll against said fixed scroll,

said adjusting mechanism being configured and arranged to produce a pressing-back force to press back said orbiting scroll from said fixed scroll against said pressing force, while said adjusting mechanism cuts off said pressing-back force in a revolving-angle area of said orbiting scroll in which an overturning moment acting on said orbiting scroll during revolution of said orbiting scroll due to gas compression becomes at least a predetermined value.

14. The scroll-type compressor of claim 13, wherein

said adjusting mechanism comprises an oil groove that is formed at a sliding face constituted between said fixed scroll and said orbiting scroll, and an oil-introduction passage that is configured to be connected to said oil groove so as to introduce a high-pressure oil into said oil groove, and

said oil groove and said oil-introduction passage are configured and arranged such that connection of said oil groove and said oil-introduction passage can be cut off in said revolving-angle area of said orbiting scroll.

15. A scroll-type compressor comprising:

a fixed scroll that is fixed in a casing;

an orbiting scroll that engages with said fixed scroll;

a pressing part that presses said orbiting scroll against the said fixed scroll in an axial direction; and

an adjusting mechanism that adjusts a pressing force of said orbiting scroll against said fixed scroll,

said adjusting mechanism being configured and arranged to produce a pressing-back force to press back said orbiting scroll from said fixed scroll against said pressing force, while said adjusting mechanism reduces said pressing-back force in a revolving-angle area of said orbiting scroll in which an overturning moment acting on said orbiting scroll during revolution of said orbiting scroll due to gas compression becomes at least a predetermined value.

16. The scroll-type compressor of claim 15, wherein

said adjusting mechanism comprises an oil groove that is formed at a sliding face constituted between said fixed scroll and said orbiting scroll, and an oil-introduction passage that is connected to said oil groove so as to introduce a high-pressure oil into said oil groove, and

said oil groove and said oil-introduction passage are configured such that an area of connection of said oil groove and said oil-introduction passage can be reduced in said revolving-angle area of said orbiting scroll.

17. The scroll-type compressor of claim 15, wherein

said adjusting mechanism comprises an oil groove that is formed at a sliding face constituted between said fixed scroll and said orbiting scroll, and an oil-introduction passage that is connected to said oil groove so as to introduce a high-pressure oil into said oil groove;

said oil groove is formed at one of said fixed scroll and said orbiting scroll; and

a low-pressure recess that said oil groove approaches in said revolving-angle area of said orbiting scroll is formed at the other one of said fixed scroll and said orbiting scroll.

18. The scroll-type compressor of claim 17, wherein

said low-pressure recess is a notch that is formed at the other one of said fixed scroll and said orbiting scroll so as to connect with a space having a lower pressure than an inside of said oil groove.