Rotary expansible chamber devices – Moving cylinder – Rotating
Patent
1984-10-17
1986-11-04
Smith, Leonard E.
Rotary expansible chamber devices
Moving cylinder
Rotating
F04C 18348
Patent
active
046208372
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to improvements in a vane-type rotary compressor provided with a rotary sleeve which is rotatable together with a plurality of vanes between a center housing and a rotor.
BACKGROUND ART
There is disclosed a vane-type rotary compressor provided with a rotary sleeve which is interposed between a center housing and a rotor and supported by compressible fluid for rotation with a plurality of vanes by Tokkyo Kokai Koho (Japanese Published Unexamined Patent Application) Sho 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 with the rotary sleeve has its center moved along not a straight line but an ellipitical figure to contact the compression side inner periphery of the center housing and that the outer periphery of the rotary sleeve touches the inner periphery of the center housing not at a particular point but on a broad area, which is variable in accordance with the number of vanes and the position of a discharge port. The compression working space is defined by two adjacent vanes to have the maximum pressure immediately before it opens to the discharge port. The maximum pressure suddenly drops when immediately after the compression working space is vent to the discharge port. This is the reason the rotary sleeve makes an irregular motion and touches the compression side inner periphery of the center housing on the aforementioned contact area. Besides, the rotaty sleeve also makes another irregular motion to contact the suction side inner periphery of the center housing whenever the engine speed or rotor speed suddenly changes.
It is the primary object of the invention to provide an improved vane-type rotary compressor in which a rotary sleeve is prevented from contacting the inner periphery of the center housing when it is pushed toward the compression side by compressed air in the compressor and free from irregular motion when the engine speed suddenly changes.
DISCLOSURE OF THE INVENTION
The present invention consists in a vane-type rotary compressor comprising a center housing, a rotary sleeve mounted in the center housing for rotation with a plurality of vanes movable in a rotor which is eccentrically disposed in the rotary sleeve, an air-bearing room defined between the inner periphery of the center housing and the outer periphery of the rotary sleeve, and a pair of discharge and suction chambers, wherein the center housing has the inner periphery thereof formed with at least an inlet port which is internally connected to the atmosphere, the discharge chamber or the compression working space defined between the adjacent vanes whereby the air-bearing room is supplied with air through the inlet port to increase the air-flowing over an area to which the rotary sleeve may contact. The increased air-flowing backs up the air-bearing performance in the air-bearing room to prevent the outer periphery of the rotary sleeve from touching the inner periphery of the center housing. The center housing can have an outlet port formed in the inner periphery thereof and internally connected to the atmosphere and the suction chamber to exhaust the air passed by the area to which the rotary sleeve may contact.
At least a pocket is desirably formed in the inner periphery of the center housing, particularly in the area to which the rotary sleeve may contact. The pocket in the compression side inner periphery is effective to increase the air-bearing performance and protect the compression side inner periphery against direct contact with the outer periphery of the rotary sleeve when the rotary sleev
REFERENCES:
patent: 2918877 (1959-12-01), Woodcock
patent: 3167362 (1965-01-01), Dschen
patent: 4479763 (1984-10-01), Sakamaki et al.
patent: 4514156 (1985-04-01), Sakamaki et al.
Horikoshi Yukio
Sakamaki Hiroshi
Yanagihashi Kikuji
Nippon Piston Ring Co. Ltd.
Smith Leonard E.
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