Structure for preventing axial leakage in a scroll compressor

Details Structure for preventing axial leakage in a scroll compressor Structure for preventing axial leakage in a scroll compressor

1995-04-20

1996-10-08

Freay, Charles

Rotary expansible chamber devices

Working member has planetary or planetating movement

Helical working member, e.g., scroll

418 57, 418104, F01C 104

Patent

active

055624359

ABSTRACT:
A structure for preventing axial leakage in a scroll compressor includes a fixed scroll, a closer mounted on the fixed scroll, a discharge chamber formed on the closer, a discharge port formed at the center of the fixed scroll, and a variable back pressure formed between the closer and the fixed scroll. The variable back pressure chamber is formed penetrating to the discharge chamber by a polytetrafluoroethylene(PTFE) or a piston. By the polytetrafluoroethylene(PTFE) having uniform expansion coefficient and the piston, the variable back pressure chamber is closed in case of high discharge pressure and opened in case of low pressure. A downward sealing force is acting on small area of a upper surface of the fixed scroll in case of high discharge pressure and broad area in case of low pressure.

REFERENCES:
patent: 3874827 (1975-04-01), Young
patent: 4767293 (1988-08-01), Caillat et al.
patent: 4877382 (1989-10-01), Caillat et al.

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