Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
2000-01-27
2001-11-20
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055500, C418S057000, C418S055200, C418S055600, C418S055100
Reexamination Certificate
active
06318982
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a scroll-type compressor having a fixed scroll and a movable scroll.
A scroll-type compressor includes a fixed scroll and a movable scroll. The fixed scroll includes a fixed volute wall on its base plate. The movable scroll includes a movable volute wall on its base plate. Sealed spaces are formed between the fixed scroll and the movable scroll. The volumes of the sealed spaces vary in accordance with an orbital motion of the movable scroll.
The sealed spaces converge toward the inner ends of the volute walls of the fixed and movable scrolls. The compressed gas in the sealed spaces applies a force (thrust load) that separates the movable scroll from the fixed scroll. If the thrust load is too strong, the movable scroll is strongly pressed against a thrust bearing. This increases the force required to move the movable scroll, which applies excessive load to the mechanism that causes the movable scroll to orbit and lowers reliability of the mechanism.
In a scroll-type compressor described in Unexamined Japanese Patent Publication No. 6-74164, counter pressure is applied to the back of the movable scroll to oppose the thrust load, which prevents the movable scroll from being strongly pressed against the thrust bearing.
However, it is difficult to determine the level of the counter pressure. If the counter pressure is too strong, the distal end of the movable volute wall is strongly pressed against the base plate of the fixed scroll. This increases the force required to orbit the movable scroll and applies an excessive load to the orbiting mechanism.
SUMMARY OF THE INVENTION
An objective of the present invention is to improve reliability of scroll-type compressors.
To achieve the above objective, the present invention provides a scroll-type compressor structured as follows. A fixed scroll includes a fixed base plate and a fixed volute wall extending from the fixed base plate. A movable scroll includes a movable base plate and a movable volute wall extending from the movable base plate. The movable scroll cooperates with the fixed scroll to form a sealed space between them. The volume of the sealed space decreases as the movable scroll orbits around a predetermined axis. The movable volute wall has an end surface that faces the fixed base plate. A passage is formed in the movable volute wall. The passage has a first opening in the end surface and a second opening in the movable base plate.
Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
REFERENCES:
patent: 5112201 (1992-05-01), Tamura et al.
patent: 5253489 (1993-10-01), Yoshii
patent: 5591018 (1997-01-01), Takeuchi et al.
patent: 5762483 (1998-06-01), Lifson et al.
patent: 6129532 (2000-10-01), Kato et al.
patent: 6152713 (2000-11-01), Hisanaga et al.
patent: 4446350A1 (1995-06-01), None
patent: 19620477A1 (1997-11-01), None
patent: 19620480A1 (1997-11-01), None
patent: 4-060188 (1992-02-01), None
patent: 5-026002 (1993-02-01), None
patent: 6-074164 (1994-03-01), None
patent: 6-101663 (1994-04-01), None
patent: 7-286587 (1995-10-01), None
patent: JA-03-237203-A1 (1991-10-01), None
patent: 05-240174-A1 (1993-09-01), None
patent: JA-64-063687-A1 (1989-03-01), None
patent: JA-02-277991-A1 (1990-11-01), None
patent: JA-03-011181-A1 (1991-01-01), None
patent: JA-03-105091-A1 (1991-05-01), None
patent: 04-321788-A1 (1992-11-01), None
patent: 06-101663-A1 (1994-04-01), None
patent: 11-241682-A1 (1999-09-01), None
Patent Abstracts of Japan Publication No. 05296169, published Nov. 9, 1993.
Patent Abstracts of Japan Publication No. 11241691, published Sep. 7, 1999; and.
Patent Abstracts of Japan Publication No. 07286587, published Oct. 31, 1995.
Fujii Toshiro
Murakami Kazuo
Nakane Yoshiyuki
Yokomachi Naoya
Denion Thomas
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Morgan & Finnegan L.L.P.
Trieu Theresa
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