Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1991-12-03
1993-07-06
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418187, 418188, 418270, F04C 1804, F04C 2908
Patent
active
052248488
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 are in an eccentric relation with each other and are rotated in the same direction to compress a refrigerant in the compression space to thereby reduce vibration during compression, so that the scroll compressor can be used for high-speed and/or large-scale applications.
However, in the conventional scroll compressor, the refrigerant in a central compression space is discharged directly to a discharge chamber from a discharge port of a rotary shaft and, accordingly, it is difficult to affix a check valve directly to the rotary shaft. Besides, when the compressor is stopped, it is likely that the refrigerant in the discharge chamber will flow back into the compression space through the discharge port to cause reverse rotation of the first and second scrolls.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved scroll compressor which permits the discharge port to normally remain open during operation and to close when the operation of the scroll compressor is stopped and, wherein the discharge port is disposed in at least one of a first scroll member and a second scroll member.
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 shaped as 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 unit;
a second scroll member having an end plate, a wrap shaped as an involute curve projecting from one side of the end plate, and a rotary shaft projecting from the other side of the end plate of the second scroll member;
a main frame rotatably supporting the shaft of the first scroll member;
a subsidiary frame rotatably supporting the shaft of the second scroll member;
the wrap of the first scroll member being in a juxtaposed engagement relation with the wrap of the second scroll member, and the shaft of the second scroll member being 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; and
a driving device for rotating the second scroll member in the same direction as the first scroll member to continuously compress the compression spaces radially inwardly from an outer position to an inner position;
wherein at least one of the first and second scroll members has a discharge port connected to the compression space, an opening to allow flow of a refrigerant, discharged into the discharge port, into the sealed container, and a check valve for closing the opening of the discharge port.
By the construction described above, the check valve is disposed at the opening of the discharge port of the first or second scroll member in such a manner that the check valve is so configured that it is effected by a centrifugal force during rotation of the shaft of the scroll member, such that the check valve is normally maintained open by the centrifugal force. Thus, the check valve is prevented from being actuated by a pressure difference between the discharge port and a high pressure chamber in the sealed container, such that reverse rotation of the scroll members can be prevented.
In another embodiment of the present invention, at least one of the first and second scroll members is provided with, at its rotary shaft, a discharge port connected to the compression space, and an opening connected to the discharge port is disposed on an ou
REFERENCES:
patent: 4781550 (1988-11-01), Morishita et al.
patent: 4842499 (1989-06-01), Nishida et al.
patent: 4846640 (1989-07-01), Nishida et al.
patent: 4865530 (1989-09-01), Nishida et al.
Mitsunaga Toshihiko
Noburu Yoshinori
Sugimoto Kazuyoshi
Sanyo Electric Co,. Ltd.
Vrablik John J.
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