Oil management in a parallel compressor arrangement

F - Mech Eng,Light,Heat,Weapons – 25 – B

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F25B 31/00 (2006.01) F04B 39/02 (2006.01)

Patent

CA 1274095

Title OIL MANAGEMENT IN A PARALLEL COMPRESSOR ARRANGEMENT Inventor Paul R. Glamm Abstract A refrigeration system has multiple compressors in a parallel arrangement. The pressures in the shells of operating compressors are maintained equal by the controlled delivery of suction gas and entrained oil to the shells of individual operating compressors in quantities which maintain the pressures therein equal. A valve, directly responsive to compressor shell pressures, occludes the flow of suction gas to the shell of an operating compressor in which the pressure is greater than that found in the shell of another operating compressor so as to equalize the pressures in the compressor shells. The equalizing valve arrangement directs and apportions essentially the entire amount of suction gas to the shells of operating compressors while cutting off the flow of suction gas into the shells of non-operating compressors. By managing the flow of suction gas so as to maintain shell pressures equal in operating compressors, equal amounts of entrained oil are directed to the shells of the operating compressors so as to ensure that no operating compressor becomes starved for oil.

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