Electronic control system for regulating startup operation of a

Details Electronic control system for regulating startup operation of a Electronic control system for regulating startup operation of a

1981-11-27

1983-05-03

Schwartz, Larry I.

Refrigeration

Automatic control

Time or program actuator

62193, 62228, F25B 3102

Patent

active

043816509

ABSTRACT:
A method and 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 temperature or pressure sensor located in the evaporator of the refrigeration system, a microprocessor, and an inlet guide vane control mechanism. During startup, the pressure of the gaseous refrigerant or the temperature of the liquid refrigerant in the evaporator of the refrigeration system, or compressor suction line pressure, is measured and an electrical signal corresponding to the measured pressure or temperature is processed by the microprocessor to determine the actual rate of pulldown of refrigerant pressure in the evaporator. The microprocessor compares the actual pulldown rate to a pulldown rate which has been predetermined to prevent compressor oil pump cavitation. The microprocessor controls the opening and closing of the inlet guide vanes to the compressor to adjust the flow of refrigerant to the compressor to achieve a pulldown rate which is approximately equal to the predetermined rate which prevents oil pump cavitation.

REFERENCES:
patent: 2983111 (1961-05-01), Miner et al.
patent: 3200603 (1965-08-01), Wake et al.
patent: 3408827 (1968-11-01), Soumeral et al.
patent: 3411313 (1968-11-01), Brown et al.
patent: 3508416 (1970-04-01), Miller
patent: 3873239 (1975-03-01), Jamieson
patent: 4080110 (1978-03-01), Szymaszek
patent: 4227862 (1980-10-01), Andrew et al.

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