Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1991-11-13
1993-09-07
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 553, 418 555, 418 57, 464102, F04C 1804
Patent
active
052422828
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a scroll compressor having a driving scroll and a driven (idling) scroll directly rotated by the driving scroll both scrolls being rotated in the same direction.
BACKGROUND OF THE INVENTION
A conventional scroll compressor is shown in, for example, Japanese Patent Publication 62-282186 (unexamined), in which a fixed scroll is positioned stationarily in a sealed container and an orbiting scroll is orbitally moved around a center of the fixed scroll.
However, in the conventional scroll compressor, a driving shaft of the orbiting scroll is cantilevered, with the result that a large vibration is generated particularly in a scroll compressor for high speed purposes. Further, in a large scale compressor, a larger centrifugal force of the orbiting scroll is produced, increasing the load applied to the bearing of the orbiting scroll. Consequently, there are possibilities of a reduction in the efficiency and reliability of operation.
A high speed scroll compressor is disclosed in Japanese Patent Publication 57-49721 (examined), in which two scrolls are rotated, and one of the scrolls is orbitally moved around the other scroll.
This high speed scroll compressor has some serious problems. For example, since the orbiting scroll is orbitally moved around the driving shaft, the orbiting scroll is possibly vibrated abruptly and violently, with the result of a failure in normal high speed operation, with abnormal sounds. Additionally, the two scrolls are rotated in the same direction by employing a coupling ring and a projection formed on an outer circumferential end of a spiral wrap so that a compression space formed by the spiral wraps of the two scrolls is reduced in volume involutely from the outer position to the inner position. Consequently, the structure becomes complex.
In the scroll compressor disclosed in aforementioned Japanese Publication 62-282186, an eccentric bearing for the orbiting scroll is spring-pressed by a resilient member to maintain a radial gap constant between the spiral wrap of the fixed scroll and the spiral wrap of the orbiting scroll so that a predetermined refrigeration capacity can be maintained. However, the eccentric bearing which receives a pin of the orbiting scroll, is pressed by the resilient member and at the same time inserted into a groove of an associated crank member. Accordingly, the orbiting scroll is influenced by the centrifugal force of its own rotation and the spring force of the resilient member. Consequently, there is a serious problem in that the pressure of the orbiting scroll against the fixed scroll becomes excessively large.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved scroll compressor of a simple structure of the type having two scrolls rotated in the same direction.
Another object of the present invention is to provide a new scroll compressor incorporating an eccentric bearing for moving a driven (or second) scroll in a radial direction relative to a driving (or first) scroll, in which scroll the eccentric bearing is set unrotatable.
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. The scroll compressor unit has a frame having a bearing at the center thereof. A first scroll is driven by the electric motor unit and has an end plate and a wrap of an involute curve projecting from the end plate. A second scroll has an end plate and a wrap of an involute curve projecting from the end plate of the second scroll in a juxtaposed relation with the first scroll so that the wraps of the two scrolls are fitted closely together to form a plurality of compression spaces. A driving device rotates the second scroll in the same direction as the first scroll. The driving device has a driving pin disposed on an outer circumference of either the first or the second scroll. A guide groove extends in a radial direction of the scrolls for receiving the driving pin in such a manne
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Ishiai Yoshio
Mitsunaga Toshihiko
Noboru Yoshinori
Sanyo Electric Co,. Ltd.
Vrablik John J.
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