Rotary expansible chamber devices – Working member has planetary or planetating movement – With relatively movable partition member
Reexamination Certificate
1999-09-20
2001-08-07
Denion, Thomas (Department: 3748)
Rotary expansible chamber devices
Working member has planetary or planetating movement
With relatively movable partition member
C418S064000, C418S065000, C418S066000, C418S067000
Reexamination Certificate
active
06270329
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rotary compressor and more particularly to a rotary compressor suitable for use in air conditioners and refrigerator and refrigerating machines.
2. Description of the Related Art
As a conventional rotary compressor, reference is here made to one disclosed in Japanese Examined Patent Publication No. Sho 62-11200, which comprises a cylinder, a piston disposed within the cylinder, and a drive shaft for driving the piston, and wherein a small-volume space is brought into communication with a vicinity of a discharge port through a pressure introducing passage for the purpose of reducing noise induced by a pressure fluctuation which occurs within the cylinder (related art
1
).
A conventional rotary compressor is also disclosed in Japanese Unexamined Patent Publication No. Sho 63-290980, which comprises a cylinder, a roller disposed within the cylinder, and a shaft for driving the roller, and wherein a small hole is formed in the vicinity of a discharge port in a cylinder end face so as to be partially open to a discharge recess (related art
2
).
A further conventional rotary compressor is disclosed in Japanese Unexamined Utility Model Publication No. Sho 60-32585, which comprises a cylinder, a roller disposed within the cylinder, and a rotary shaft for driving the roller, and wherein a space is formed in communication with the interior of the cylinder with a view to reducing noise caused by a pressure fluctuation in the cylinder and an inlet passage which provides communication between the space and the interior of the cylinder is open to the interior of the cylinder at an intermediate pressure portion in order to prevent an increase of input caused by a reverse flow of a compressed refrigerant in the space at an initial stage of the compression stroke (related art
3
).
In the above related arts
1
and
2
, however, since the small-volume space or the small hole is always kept in communication with a compression chamber in the cylinder, a high-pressure refrigerant at the end of the discharge stroke, which remains in the small-volume space or in the small hole, flows reverse into the cylinder at the initial stage of the compression stroke, with consequent re-expansion and eventual loss.
In the above related art
3
, since a space for diminishing the pressure fluctuation is open into the cylinder which is in the suction stroke, so that the refrigerant which remains within the space flows back into the cylinder during the suction stroke, thus giving rise to a loss.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a rotary compressor capable of reducing noise generated by a pressure fluctuation in a compression chamber and capable of preventing a loss caused by re-expansion of a refrigerant which remains in the small space and a loss caused by return of the refrigerant into a suction chamber.
According to the first feature of the present invention for achieving the above-mentioned object there is provided a rotary compressor comprising a cylinder which defines a cylinder chamber, a piston disposed within the cylinder chamber, and a drive mechanism for driving the piston, the piston having a roller which performs a revolving motion within the cylinder chamber and a vane which, together with the roller, partitions the interior of the cylinder chamber into a suction chamber and a compression chamber, with a small space being provided so as to communicate with the compression chamber in a predetermined section without coming into communication with the suction chamber.
According to the second feature of the present invention there is provided a rotary compressor comprising a cylinder which defines a cylinder chamber, a piston disposed within the cylinder chamber, and a drive mechanism for driving the piston, the piston having a roller which performs a revolving motion within the cylinder chamber and a vane which, together with the roller, partitions the interior of the cylinder chamber into a suction chamber and a compression chamber, with a small space being provided so as to communicate with the compression chamber in a predetermined section exclusive of a rotational angle of the roller corresponding to a minimum projection quantity of the vane into the cylinder chamber.
Preferably, the roller and the vane are formed integrally with each other, and the vane is supported by a swing bush so that it can swing, advance and retreat.
Preferably, a communication passage for communication of the small space with the compression chamber is formed in the swing bush.
Preferably, the roller and the vane are formed separately from each other.
Preferably, the communication passage for communication of the small space with the compression chamber is formed in the vane.
Preferably, the communication passage for communication of the small space with the compression chamber is constituted of a combination of a communication passage formed in the vane and a communication passage formed in the swing bush.
Preferably, the predetermined section in which the small space is brought into communication with the compression chamber is mainly a discharge stroke.
Preferably, the predetermined section in which the small space is brought into communication with the compression chamber is mainly the first half of a compression stroke.
Preferably, the small space is provided in the plural number and the predetermined section in which the small space comes into communication with the compression chamber is also provided in the plural number.
According to the third feature of the present invention there is provided a rotary compressor comprising a cylinder which defines a cylinder chamber, a piston disposed within the cylinder chamber, and a drive mechanism for driving the piston, the piston having a roller which performs a revolving motion within the cylinder chamber and a vane which, together with the roller, partitions the interior of the cylinder chamber into a suction chamber and a compression chamber, the roller and the vane being formed integrally with each other, wherein a swing bush which supports the vane so as to absorb advance and retreat motions and swing motion of the vane is provided in the cylinder, and a plurality of small spaces adapted to communicate with the compression chamber are provided so as to communicate with the compression chamber in a plurality of predetermined sections.
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patent: 4737088 (1988-04-01), Taniguchi et al.
patent: 4975031 (1990-12-01), Bagepalli et al.
patent: 5074761 (1991-12-01), Hirooka et al.
patent: 5302095 (1994-04-01), Richardson, Jr.
patent: 60-32585 (1985-03-01), None
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patent: 63-230980 (1988-09-01), None
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patent: 7229654 (1995-08-01), None
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Kawaminami Shigeya
Ooki Minoru
Oshima Kenichi
Wakana Tatuya
Antonelli Terry Stout & Kraus LLP
Denion Thomas
Hiatchi Ltd.
Trieu Theresa
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