Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1992-01-10
1993-09-07
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 554, 418 555, 418 57, F04C 1804, F04C 2700
Patent
active
052422844
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a scroll compressor having a driving scroll member and a driven (idling) scroll member directly rotated by the driving scroll member wherein the two scroll members are rotated in the same direction.
BACKGROUND OF THE INVENTION
A conventional scroll compressor is shown in, for example, Japanese Patent Publication No. 1-35196/1989 (examined), in which the first and second scroll members, in an eccentric relation with each other, are rotated in the same direction to compress a refrigerant in a compression space to thereby reduce vibration at the time of compression, so that the scroll compressor can be used for high-speed and/or large scale applications.
However, in the conventional scroll compressor, sealed space is formed between an end plate of the first scroll member and a confronting first housing by a slide ring, and, similarly, a sealed space is formed between an end plate of the second scroll member and a confronting second housing, and a refrigerant in the compression space is supplied to the sealed spaces to thereby press the first and second scroll members. At the start of operation, however, a gap in the axial direction is enlarged more than necessary and the compression within the compression space is substantially delayed, with the result that the refigeration capacity at the initial stage of the start of the operation is lowered. Further, since the rotational portions are sealed by the slide rings, relative rotation speed of the rotational sealing portions becomes higher, resulting in failures in durability and in the sealing effect of the slide rings.
In addition, an Oldham's ring is provided outside the rotating scroll compressor unit, which is disposed between the end plate of the first scroll member and a flange of the second scroll member and, therefore, the entire structure becomes large, and it does not meet with a small-size requirement.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved scroll compressor solving the problems encountered in the conventional scroll compressor.
Another object of the present invention is to provide improved scroll compressor which has a constant gap in the axial direction of the first and second scroll members, and improved durability and sealing effects at the sealing portions of the scroll members.
A further object of the present invention is to provide a scroll compressor of a reduced size.
According to the present invention, there is provided a scroll compressor incorporating an electric motor unit and a scroll compressor unit in a sealed container, wherein the scroll compressor unit has a first scroll member having an end plate, a wrap of an
involute curve projecting from one side of the end plate, and a rotary shaft projecting from the other side of the end plate and connected to the electric motor units. A second scroll member has an end plate with a wrap of
an involute curve projecting from the other side of the end plate of the second scroll member. A main frame rotatably supports the shaft of the first scroll member and a subsidiary frame rotatably supports the shaft of the second scroll member. The wrap of the first scroll member is in a
juxtaposed engagement relation with the wrap of the second scroll member, and the shaft of the second scroll member is eccentrically spaced from the shaft of the first scroll member so that the wraps of the two scroll members are fitted closely together to form a plurality of compression spaces. A driving device rotates the second scroll member
in the same direction as the first scroll member to continuously compress the compression space radially inwardly from an outer position to an inner position. A limit means is disposed on one of the first and second
scroll members for limiting axial movement of the other of the first and second scroll members, and a pressure means is formed between the limit means of the
one of the two scroll members and the end plate of the other of the two scroll members.
In a first embodiment of
REFERENCES:
patent: 4600369 (1986-07-01), Blain
patent: 4927339 (1990-05-01), Riffe et al.
patent: 5129798 (1992-07-01), Crum et al.
Ishiai Yoshio
Mashimo Denji
Mitsunaga Toshihiko
Noboru Yoshinori
Sugimoto Kazuyoshi
Sanyo Electric Co,. Ltd.
Vrablik John J.
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