Rotary expansible chamber devices – Moving cylinder – Rotating
Patent
1985-01-11
1986-06-17
Smith, Leonard E.
Rotary expansible chamber devices
Moving cylinder
Rotating
F04C 18348
Patent
active
045953481
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELDS
The present invention relates to apparatus for fluidly supporting a rotary sleeve rotatably mounted in a compressor housing for rotation with a plurality of vanes which are movably fitted in a rotor rotatable at an eccentric position in the rotary sleeve, more particularly to a rotary sleeve supporting apparatus of the type having a filmy air-bearing room defined between the inner periphery of the center housing of the rotary compressor and the outer periphery of the rotary sleeve.
BACKGROUND ART
The inventors of this application have previously proposed a vane-type rotary compressor provided with a rotary sleeve interposed between a center housing and a rotor, under Japanese Patent Application No. 56-162025 (JP, A, 58-65988). The compressor is particularly suitable for use with an automobile engine required to operate over a wide speed range because of being substantially free from frictional heat as well as wear at the apex of each vane. However, there is the possibility of scuffing and seizure troubles if air is highly compressed in the compression working space within the compressor to push the rotary sleeve from within to the inner periphery of the center housing.
From a study on the movement of the rotary sleeve, it has been clarified that a contact between the rotary sleeve and the center housing possibly takes place at not a specific line but a relatively wide zone. The inventors have proposed under patent application No. 58-28608 (JP, A, 59-155589) that the air inlet is provided at the starting line of the contact zone in which the contact is likely to occur and internally connected to one of the open air, the discharge chamber, and the compression working space under the maximum pressure to increase an amount of air flowing over the contact zone and improve the bearing effect of the air-bearing room. However, there has remained a problem that the bearing effect is not uniformly raised, that is, high in the center but low in the opposite ends, resulting in that the rotary sleeve has the opposite ends unbalanced in the air-bearing room.
It is the primary object of the invention to provide a rotary sleeve supporting apparatus in which the rotary sleeve has the opposite ends thereof well balanced when air is supplied into the air-bearing room to increase an amount of air flowing about the rotary sleeve.
DISCLOSURE OF INVENTION
To attain the object as described above, the invention consists in the apparatus comprising two guide grooves formed peripherally in the opposite end portions of the outer periphery of the rotary sleeve and/or the inner periphery of the center housing. The guide grooves allow air supplied to rapidly spread and go round on the inner periphery of the center housing. In the case that the peripheral grooves are formed in the contact zone of the center housing, air rapidly flows along the contact zone to spread to the opposite ends with the result that the rotary sleeve has the opposite ends thereof supported without contacting the inner periphery of the center housing.
When an abnormal movement of the rotary sleeve is caused by a sudden speed change in the engine driving the rotary compressor, the rotary sleeve sometimes contacts the suction side inner periphery of the center housing. Accordingly, the guide grooves are desirably provided in the suction side inner periphery of the center housing to allow the air passed by the contact zone to go round rapidly toward the suction side in which the bearing effect is increased to prevent the rotary sleeve from contacting the suction side inner periphery of the center housing.
In preference, the full round guide groove is formed in each side end position of the outer periphery of the rotary sleeve and/or the inner periphery of the center housing to produce a stable bearing effect in all the round of the air-bearing room. The full round guide groove can be formed with more ease than the partial one. The guide groove is preferably connected to the discharge chamber or working space under the maximum pressure and supp
REFERENCES:
patent: 4197061 (1980-04-01), Hill
Horikoshi Yukio
Sakamaki Hiroshi
Yanagihashi Kikuji
Nippon Piston Ring Co. Ltd.
Smith Leonard E.
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