Mechanical control system for preventing compressor lubrication

Details Mechanical control system for preventing compressor lubrication Mechanical control system for preventing compressor lubrication

1981-11-27

1983-08-23

Makay, Albert J.

Refrigeration

Automatic control

Refrigeration producer

62217, 62228, 62469, 417281, F25B 4302

Patent

active

043996639

ABSTRACT:
A control system for operating a vapor compression refrigeration system to prevent oil pump cavitation during startup of the refrigeration system is disclosed. The control system includes a differential pressure switch which is connected on one side to a reservoir which is in fluidic communication with the refrigeration system evaporator or compressor suction line. The pressure switch is connected on its other side directly to the evaporator or compressor suction line. In operation, the reservoir fills with vaporous refrigerant from the refrigeration system when the refrigeration system is shut down and the vaporous refrigerant flows through a restrictor valve back to the refrigeration system at startup of the refrigeration system. The size of the reservoir and restrictor valve are selected so that the differential pressure switch is activated and a control is generated when too rapid a decrease in evaporator or compressor suction line pressure is detected. The control signal is supplied to a compressor guide vane control mechanism to adjust the system pulldown rate to prevent lubrication system cavitation.

REFERENCES:
patent: 2715992 (1955-08-01), Wilson
patent: 2983111 (1961-05-01), Miner et al.
patent: 3200603 (1965-08-01), Wake et al.
patent: 3408827 (1968-11-01), Soumerai et al.
patent: 3508416 (1970-04-01), Miller
patent: 3873239 (1975-03-01), Jamieson
patent: 4080110 (1978-03-01), Szymaszek
patent: 4184341 (1980-01-01), Friedman
patent: 4208883 (1980-06-01), Stirling

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