Scroll compressor relief valve

Details Scroll compressor relief valve Scroll compressor relief valve

1988-05-16

1989-06-20

Croyle, Carlton R.

Pumps

With condition responsive pumped fluid control

Inlet pressure increase opens bypass from pump inlet to...

417310, F04B 4902

Patent

active

048405450

ABSTRACT:
In a rotary compressor, a relief valve for providing refrigerant at suction gas pressure to the discharg port when the rotary compressor is operated in the reverse rotation direction. The relief valve includes in the preferred embodiment a passage for providing a source of refrigerant at suction pressure, a pressure responsive relief valve, and a passage for providing refrigerant at suction pressure from the relief valve to the discharge port. When the compressor system is operated in the correct rotation, refrigerant at discharge pressure maintains the relief valve in the closed position, preventing flow from the discharge port to the suction pressure source. When the compressor system is operated in the reverse rotation however, the pressure in the discharge port is reduced to below that of the refrigerant in the suction pressure source, whereupon the releif valve opens permitting flow from the suction pressure source to the discharge port. This thereby provides a source of refrigerant to the compressor to prevent damage to the compressor system during the reverse rotation period.

REFERENCES:
patent: 4216661 (1980-08-01), Tojo et al.
patent: 4383805 (1983-05-01), Teegarden et al.
patent: 4389171 (1983-06-01), Eber et al.
patent: 4560330 (1985-12-01), Murayama et al.
patent: 4744733 (1988-05-01), Terauchi et al.

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