Compressor oil pressure control method

Details Compressor oil pressure control method Compressor oil pressure control method

1996-06-28

1998-03-10

Wayner, William E.

Refrigeration

Processes

Lubricant handling

62222, 62473, 62193, F25B 3100, F25B 4302

Patent

active

057248214

ABSTRACT:
The present invention is a method for controlling oil lubricant pressure of a screw type compressor in an air conditioning system. In response to a low oil pressure condition, evaporator pressure is lowered to increase the pressure differential across a compressor, to thereby bring about an increase in oil pressure. Evaporator pressure can be lowered by decreasing the maximum operating pressure of the evaporator, and by throttling an expansion valve by the amount required to lower the evaporator pressure in accordance with the reduced maximum operating setpoint.

REFERENCES:
patent: 5067326 (1991-11-01), Alsenz
patent: 5134856 (1992-08-01), Pillis et al.

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