Rotary expansible chamber devices – Working member has planetary or planetating movement – With relatively movable partition member
Patent
1995-08-24
1996-12-03
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
With relatively movable partition member
418 94, F04C 1832
Patent
active
055802311
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a swing type rotary compressor primarily for use in a refrigerator.
2. Background Art
Conventionally, a swing type rotary compressor has been known in which, as described in Japanese Patent Laid-Open Publication HEI 5-202874, a blade for dividing a cylinder chamber into a suction chamber and a compression chamber is integral with and projects from a roller which is fitted around an eccentric portion of a drive. shaft, where the blade is swingably supported by a receptive groove of a support member rotatably provided to the cylinder so that gaseous fluid is compressed with the roller moving around. More specifically, in the conventional swing type rotary compressor, as shown in FIG. 6, an eccentric portion D1 of a drive shaft D is inserted in a cylinder chamber A1 of a cylinder A, and a roller B is fitted to the eccentric portion D1. Moreover, a blade B1 protruding radially is provided integrally with the roller B. The blade B1 is supported by a receptive groove Cl of a cylindrical support member C rotatably held within the cylinder A in such a way that the blade B1 is swingable and forward-and-backward movable. The interior of the cylinder chamber A1 is divided into a compression chamber and a suction chamber by the roller B and the blade B1. Rotation of the drive shaft D causes the roller B to be driven into revolution around the shaft, and the revolution of the roller B in turn causes gaseous fluid to be sucked into the suction chamber and compressed in the compression chamber.
However, in the above-described swing type rotary compressor, because of its construction that the blade B1 is integral with the projects from the roller B and is supported by the support member C so as to be swingable and forward-and-backward movable, even if the roller B is driven into revolution by the rotation of the eccentric portion D1 of the drive shaft D, the roller B will not rotate itself. As a result, the peripheral speed of the outer peripheral surface of the eccentric portion D1 relative to the inner peripheral surface of the roller B is increased. On this account, under demanding lubricating conditions such as in an overloaded operation, the lubrication between the outer peripheral surface of the eccentric portion D1 and the inner peripheral surface of the roller B would worsen so that seizure or wear occurs, giving rise to a problem of deteriorated machine reliability.
DISCLOSURE OF INVENTION
The present invention has been developed in view of the above described disadvantages. The object of the present invention is therefore to provide a swing type rotary compressor which positively feeds oil between the outer peripheral surface of the eccentric portion and the inner peripheral surface of the roller even when a peripheral speed between the outer periphery of the eccentric portion of the drive shaft and the inner periphery of the roller is high, so that a successful lubrication therebetween can be obtained even under an overloaded operation, whereby the compressor can be prevented from seizure and wear and therefore improved in the machine reliability.
In order to achieve the aforementioned object, a swing type rotary compressor of the present invention comprises a cylinder having a cylinder chamber formed therein, a roller fitted around an eccentric portion of a drive shaft and installed in the cylinder chamber, a blade integrally formed with and projects from the roller and dividing the cylinder chamber into a compression chamber and a suction chamber, a support member swingably provided in the cylinder and having a receptive groove for receiving a tip portion of the blade in such a way that the tip portion can freely move forward and backward, and an oil groove which is formed on an inner peripheral surface of the roller on a counter loaded side and within a range from a first position where the blade projects therefrom to a second position displaced from the first position 180 degrees in a rotating direction of the drive shaft, and which is open
REFERENCES:
patent: 1137215 (1915-04-01), Kinney
patent: 2018521 (1935-10-01), Heitman
patent: 2169131 (1939-08-01), Albertson
patent: 3499600 (1970-03-01), McGregor
Daikin Industries Ltd.
Vrablik John J.
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