Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1997-08-29
2000-06-20
Vrablik, John J.
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 555, 418 57, F04C 1804
Patent
active
060770570
ABSTRACT:
A number of scroll compressor designs protect the back chamber seals upon reverse rotation. In the prior art, scroll compressors are sometimes miswired and inadvertent reverse rotation results. In some applications, this has caused the seals to be crushed. The present invention ensures that upon reverse rotation, the pressure within the back chamber is maintained at suction pressure rather than the very low pressure which may be found in the compression chambers. The seals are protected. In one embodiment, a relief is formed at a seal groove to ensure suction pressure does communicate into the back chamber. In other embodiments, a valve controls the pressure in the back chamber. Upon normal operation, the valve allows pressure from the back pressure tap to communicate into the back chamber. During reverse rotation, the valve allows suction pressure to communicate to the back chamber.
REFERENCES:
patent: 4645437 (1987-02-01), Sakashita et al.
patent: 4993928 (1991-02-01), Fraser, Jr.
patent: 5145345 (1992-09-01), Barito et al.
patent: 5588820 (1996-12-01), Hill et al.
patent: 5591014 (1997-01-01), Wallis et al.
patent: 5607288 (1997-03-01), Wallis et al.
Barito Thomas R.
Fields Gene Michael
Hugenroth Jason J.
Williams John R.
Scroll Technologies
Vrablik John J.
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