Rotary compressor relief valve

Details Rotary compressor relief valve Rotary compressor relief valve

F - Mech Eng,Light,Heat,Weapons

04

B

230/37

F04B 49/02 (2006.01) F04C 18/02 (2006.01) F04C 18/04 (2006.01) F04C 18/32 (2006.01) F04C 29/00 (2006.01) F16K 17/00 (2006.01)

Patent

CA 1267395

Title ROTARY COMPRESSOR RELIEF VALVE Abstract In a rotary compressor, a relief valve for providing refrigerant at suction gas pressure to the discharge 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 relief 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.

589604

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