Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Reexamination Certificate
1999-06-23
2001-05-08
Vrablik, John J. (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
C418S055600, C418S104000, C418SDIG001, C184S006160
Reexamination Certificate
active
06227831
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application Nos. Hei. 10-177733 filed on Jun. 24, 1998 and Hei. 11-26422 filed on Feb. 3, 1999.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a compressor suitable for use in a refrigerating cycle, such as for an automotive air conditioning system.
2. Description of Related Art
A lip seal of a compressor seals a gap between a shaft and housing for preventing fluid being compressed from flowing out of the compressor. Because the shaft rotates, lubricant oil needs to be supplied to the lip seal to lubricate the shaft and lip seal.
JP-A-7-253088 discloses that the lubricant oil is supplied to a bearing disposed near the lip seal. Further, this lubricant oil is led and supplied to the lip seal.
However, in JP-A-7-253088, when an insufficient amount of lubricant oil is supplied to the bearing, the lubricant oil is not supplied to the lip seal.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a compressor in which a sufficient amount of lubricant oil supplied to the inside of the housing reaches the lip seal.
According to a first aspect of the present invention, an inclined surface is formed in an upper inside wall of the housing, and the inclined surface inclines downwardly toward the lip seal. The lubricant oil supplied to the upper end of the inclined surface flows along the inclined surface without dropping downwardly due to surface tension, and reaches the lip seal. Thus, sufficient lubricant oil is always led and supplied to the lip seal, thereby reducing the wear of the lip seal and improving the durability of the compressor.
According to second aspect of the present invention, an injection passage conducts the lubricant oil from an oil storage chamber to the upper end of the inclined surface due to a pressure difference between a fluid suction side and fluid discharge side of a compression mechanism. Thus, the lubricant oil is led and supplied to the lip seal with greater certainty than in the first aspect of the present invention.
According to third aspect of the present invention, grooves are formed in parallel on the outer surface of a balance weight in a scroll type compressor. Further, the grooves are inclined toward the lip seal as the balance weight rotates. The balance weight rotates and works as a screw pump to lead the lubricant oil to the lip seal. Thus, the lubricant oil is supplied to the lip seal with certainty, thereby reducing the wear of the lip seal.
According to fourth aspect of the present invention, an injector is formed in the inside wall of the balance weight in a scroll type compressor. The lubricant oil stored within the inside wall is injected and led to the lip seal due to centrifugal force of the balance weight. Thus, the lubricant oil is led to the lip seal with certainty.
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Hakamada Naoki
Hyakutake Tetsuya
Matsuda Mikio
Ogawa Yukio
Osima Toshihiro
Denso Corporation
Pillsbury & Winthrop LLP
Vrablik John J.
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