Rotary expansible chamber devices – Moving cylinder – Rotating
The present invention relates to an apparatus for supporting a rotary sleeve rotatable with vanes in a rotary compressor, and more particularly to an improved apparatus for supporting the rotary sleeve by an air-bearing effect produced in 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.
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 takes place not at a specific line but in 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 zone in which the rotary sleeve is likely to contact and is internally connected to the open air, the discharge chamber, and the compression working space under the maximum pressure to increase an amount of air flowing over the zone. However, when a sudden change occurs in the rotational speed of the internal combustion engine, the rotor is driven to rotate. The rotary sleeve abnormally moves to contact the suction side inner periphery of the center housing, thereby rotating in a disorderly manner.
It is the primary object of the invention to provide an apparatus by which the rotary sleeve is floatingly supported without contacting the compression side inner periphery of the center housing when compressed air pushes the rotary sleeve from within to the compression side inner periphery and the suction side inner periphery when a sudden change occurs in the rotational speed of the rotor to move the rotary sleeve toward the suction side inner periphery.
DISCLOSURE OF INVENTION
The apparatus of the invention comprises a buffer chamber formed in either or both of the compression and suction sides of the center housing. The buffer chamber is located in the thickened portion of the center housing surrounding the rotary sleeve and is opened to an air-bearing room defined between the inner periphery of the center housing and the outer periphery of the rotary sleeve through a plurality of tiny bores.
In addition to the buffer chamber, the apparatus is preferably provided with an air passage, as an aerodynamic means, to increase an amount of air flowing over the zone which the rotary sleeve is likely to contact. The air passage extends to the starting line of the zone from the atmosphere, the discharge chamber, or the compression working space which is defined by two adjacent vanes and situated just before a position in which the space is connected to the discharge chamber.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a side elevation of the rotary compressor according to the invention, the rear side housing being eliminated for illustration of the side surface of the rotor;
FIG. 2 is a section taken along the line II--II of FIG. 1;
FIG. 3 is a section taken along line III--III of FIG. 1;
FIG. 4 is a development of the inlet port;
FIGS. 5 and 6 are views, similar to FIG. 4, of different embodiments;
FIGS. 7 and 8 are views, similar to FIG. 1, of different embodiments;
FIG. 9 is a development of an air-accumulating groove;
FIGS. 10 and 12 are views, similar to FIG. 9, of other embodiments,
FIG. 13 is a view, similar to FIG. 1, of another embodiment
FIG. 14 is a section taken along th
patent: 4479763 (1984-10-01), Sakamaki et al.
Nippon Piston Ring Co. Ltd.
Smith Leonard E.
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