SCROLL MEMBER, METHOD OF MANUFACTURING SAME, COMPRESSION MECHANISM AND SCROLL COMPRESSOR

• US 20100111739A1
• Filed: 03/26/2008
• Published: 05/06/2010
• Est. Priority Date: 03/30/2007
• Status: Active Grant

• Current Assignee: Daikin Industries Ltd
• Original Assignee: Daikin Industries Ltd
• Inventors: Kajiwara, Mikio, Kishikawa, Mitsuhiko, Murakami, Yasuhiro, Arai, Mie, Yamamoto, Satoshi, Yamaji, Hiroyuki
• Granted Patent: US 8,402,649 B2
• Time in Patent Office: Days
• US Class Current: 418/55.100
• CPC Class Codes: B22D 17/007 Semi-solid pressure die casting
• CPC Class Codes: F04C 18/0215 where only one member is moving
• CPC Class Codes: F04C 18/0246 Details concerning the involute wraps or their base, e.g. geometry
• CPC Class Codes: F04C 18/0269 Details concerning the involute wraps
• CPC Class Codes: F04C 2230/10 by removing material
• CPC Class Codes: F04C 2230/21 by casting
• CPC Class Codes: Y10T 29/4924 Scroll or peristaltic type

Abstract

A method of manufacturing a scroll member includes a casting step and a cutting step. In the casting step an iron casting having a spiraling part is formed. In the cutting step, the iron casting obtained in the casting step is cut to obtain a final shape of the scroll member. Preferably the iron casting obtained in the casting step has a fixing part with the spiraling part extending from one side and a protruding part extending from an opposite side. A specified portion of the spiraling part, a central portion of the fixing part and/or the protruding part has a larger dimension before the cutting step is performed than after the cutting step is performed.

Claims

1. A method of manufacturing a scroll member for a compression mechanism installed in a scroll compressor, the the method comprising:

a casting step including forming an iron casting including a spiraling part extending in a spiraling formation; and

a cutting step including cutting the iron casting obtained in the casting step in order to obtain a final shape of the scroll member,

the iron casting obtained in the casting step having a dimension in a specified portion of the spiraling part that is greater before the cutting step is performed than after the cutting step is performed, and

the specified portion being positioned at least at an end in a center side of the spiraling formation.

2. The method for manufacturing a scroll member according to claim 1, wherein

the specified portion of the spiraling part extends from 180 to 360 degrees around the center from the end of the spiraling portion.

3. The method for manufacturing a scroll member according to claim 1, wherein

the compression mechanism includes an orbiting scroll and a fixed scroll provided with a central hole;

and

the scroll member is configured to be used as i the orbiting scroll, with the specified portion encircling the hole of the fixed scroll after the cutting step is performed and when the orbiting scroll has been incorporated into the compression mechanism with the fixed scroll.

4. The method for manufacturing a scroll member according to claim 1, wherein

the compression mechanism includes an orbiting scroll and a fixed scroll provided with a central hole;

the scroll member includes the central hole, which is created during at least one of the casting and cutting steps such that the scroll member is configured to be used as the fixed scroll, with the specified portion encircling the central hole after the cutting step is performed and when the fixed scroll has been incorporated into the compression mechanism with the orbiting scroll.

5. The method for manufacturing a scroll member according to claim 1, wherein

the dimension is a thickness of the spiraling part.

6. The method for manufacturing a scroll member according to claim 5, wherein

the iron casting obtained in the casting step further includes a fixing part with the spiraling part extending therefrom;

and

a height of the specified portion measured from the fixing part is greater before the cutting step is performed than after the cutting step is performed.

7. The method for manufacturing a scroll member according to claim 1, wherein

the iron casting obtained in the casting step further includes a fixing part with the spiraling part extending therefrom;

and

the dimension is a height of the spiraling part measured from the fixing part.

8. The method for manufacturing a scroll member according to claim 5, wherein

the iron casting obtained in the casting step further includes a fixing part with the spiraling part extending from a first side thereof;

and

the dimension is a base thickness of the specified portion at a base portion thereof that is fixed to the fixing part.

9. The method for manufacturing a scroll member according to claim 8, wherein

the base thickness of the specified portion at the base portion decreases as the specified portion extends towards a distal end of the spiraling part before the cutting step is performed.

10. The method for manufacturing a scroll member according to claim 9, wherein

a distal portion of the specified portion has a distal thickness that is also greater before the cutting step is performed than after the cutting step is performed;

and

the base thickness is larger than the distal thickness before the cutting step is performed.

11. The method for manufacturing a scroll member according to claim 10, wherein

a side surface of the spiraling part is a flat surface formed in both the base portion and the distal portion before the cutting step is performed;

and

the side surface extending along the base portion is inclined with respect to the side surface extending along the distal portion before the cutting step is performed.

12. The method for manufacturing a scroll member according to claim 8, wherein

the base portion of the specified portion, a distal portion of the specified portion, and the first side of the fixing part are all when the cutting step is performed;

and

more material thickness is cut from the base portion than is cut from the distal portion and the first side of the fixing part as measured in thickness directions of the distal portion and the fixing part.

16. The method for manufacturing a scroll member according to claim 1, wherein

the iron casting is formed by semi-molten die casting in the casting step.

17. A scroll member manufactured by the method according to claim 1, wherein

a ratio of height of the spiraling part measured from the fixing part relative to thickness of the spiraling part is 8.5 or greater after the cutting step is performed.

18. The scroll member according to claim 17, wherein

hardness of a base portion of the spiraling part that is fixed to the fixing part is HRB 95 or greater near the end in the center side of the spiraling formation.

19. A compression mechanism including at least one scroll member according to claim 17 used as as an orbiting scroll, a fixed scroll, or both.

20. A scroll compressor including the compression mechanism according to claim 19.

21. The scroll compressor according to claim 20, wherein

a refrigerant including carbon dioxide as a main component is used therein.

13. A method of manufacturing a scroll member for a compression mechanism installed in a scroll compressor, the method comprising:

a casting step including forming cast iron and obtaining an iron casting including a fixing part and a spiraling part extending from a first side the fixing part in a spiraling formation; and

a cutting step including cutting the iron casting obtained in the casting step in order to obtain a final shape the scroll member,

the iron casting obtained in the casting step being formed so that a thickness of a central portion the fixing part near a center of the spiraling formation is greater before the cutting step is performed than after the cutting step is performed.

14. The method for manufacturing a scroll member according to claim 13, wherein

the iron casting obtained in the casting step further includes a protruding part fixed to the fixing part on a second side opposite to the first side;

and

the protruding part extends in a cylindrical shape from an edge of the central portion of the fixing part toward the second side.

15. A method of manufacturing a scroll member for a compression mechanism installed in a scroll compressor, the method comprising:

a casting step including forming an iron casting including a fixing part, a spiraling part extending from a first side of the fixing part in a spiraling formation, and a protruding part fixed near a center of the fixing part on a second side opposite to the first side; and

a cutting step including cutting the protruding part of the iron casting obtained in the casting step into a cylindrical shape open only in the second side.