Rotary expansible chamber devices – Methods
Patent
1995-01-06
1996-10-15
Vrablik, John J.
Rotary expansible chamber devices
Methods
418 66, F04C 1804
Patent
active
055649165
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rotary compressor primarily for use in a refrigerator.
BACKGROUND ART
Generally, a rotary compressor has a motor-driven compression member provided within a closed casing. This compression member comprises: a cylinder which has a cylinder chamber, and a suction port and a discharge port both opened to the cylinder chamber; a roller which is insertedly fitted to an eccentric shaft of a drive shaft extending from the motor and which revolves in the cylinder chamber along with rotation of the drive shaft; and a blade which is supported at an intermediate portion between the suction port and discharge port of the cylinder so as to be free to advance and retreat radially. The blade is so arranged that part of high-pressure gas discharged from the discharge port acts on its back face as back pressure, which back pressure in turn causes the tip of the blade to be always kept in contact with the outer peripheral surface of the roller. As a result, the interior of the cylinder chamber is partitioned into a low-pressure chamber communicating with the suction port and a high-pressure chamber communicating with the discharge port.
However, when the blade is supported to the cylinder so as to be free to advance and retreat, and has back pressure given on its back face side so that the tip of the blade is always kept in contact with the outer peripheral surface of the roller as described above, the contact portion between the blade and the outer peripheral surface of the roller is poorly fed with lubricating oil so as to be brought into metallic contact, during relative rotation of the roller and the blade. The result would be greater friction loss due to sliding resistance and therefore greater power loss, to a disadvantage. Further, high-pressure gas compressed in the high-pressure chamber may leak through the contact portion between the tip side of the blade and the roller into the low-pressure chamber. This would cause another problem that compression efficiency deteriorates.
Thus, the present inventor has before proposed a rotary compressor which can solve the above problems (Japanese Patent Application No. HEI 4-252750). Although this patent application has not been laid open yet, nor is it the prior art of the present invention, yet it is here described for an easier understanding of the present invention. The rotary compressor, as shown in FIG. 8, comprises a cylinder A having a cylinder chamber A1, and a roller C fitted to an eccentric shaft B1 of a drive shaft B and internally provided in the cylinder chamber A1. In the rotary compressor, a blade D is coupled with an outer peripheral portion of the roller C so as to protrude radially outward, while a retainer hole A5 of circular shape in cross section having an opening A4 opened to the cylinder chamber A1 is formed at an intermediate portion between a suction port A2 and a discharge port A3 both provided in the cylinder A. In this retainer hole A5 is provided a swinging bushing E which has a receptive groove E1 for receiving the protruding tip side of the blade D in such a way that the tip side of blade D is free to advance and retreat, and which is swingably retained to the cylinder A. In this arrangement, the protruding tip side of the blade D is inserted into the receptive groove E1 of the bushing E so as to be free to advance and retreat, whereby the interior of the cylinder chamber A1 is partitioned into a low-pressure chamber Y communicating with the suction port A2 and a high-pressure chamber X communicating with the discharge port A3. Besides, the blade D is inserted into the bushing E, whereby the roller C is non self-rotary type and operates along the inner peripheral surface of the cylinder chamber A1. It is noted that, in FIG. 8, reference character F denotes a valve plate disposed on the outer side of the discharge port A3 and G denotes a receptive plate of the valve plate F.
With the roller C in operation within the cylinder chamber A1 by the drive of the drive shaft B, the blade D coupled wi
REFERENCES:
patent: 1923291 (1933-08-01), Zimmerer
patent: 1997725 (1935-04-01), Gaede
patent: 3081707 (1963-03-01), Marshall
patent: 3269646 (1966-08-01), August
patent: 4585404 (1986-04-01), Barata
patent: 4836759 (1989-06-01), Lloyd
Masuda Masanori
Uematsu Takahiro
Yamamoto Yasushi
Daikin Industries Ltd.
Vrablik John J.
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