Compressor oil pressure control method
First Claim
1. A method for controlling oil pressure of a compressor in an air conditioning system of the type wherein the oil pressure is dependent on the pressure difference between the suction and discharge of the compressor, said system having an evaporator, said method comprising the steps of:
- determining oil pressure differential in said compressor;
comparing said determined oil pressure differential to a predetermined minimal oil pressure differential; and
on the condition that said determined oil pressure differential is less than said minimum oil pressure differential reducing an operating pressure of said evaporator to increase said oil pressure.
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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.
25 Citations
12 Claims
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1. A method for controlling oil pressure of a compressor in an air conditioning system of the type wherein the oil pressure is dependent on the pressure difference between the suction and discharge of the compressor, said system having an evaporator, said method comprising the steps of:
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determining oil pressure differential in said compressor; comparing said determined oil pressure differential to a predetermined minimal oil pressure differential; and on the condition that said determined oil pressure differential is less than said minimum oil pressure differential reducing an operating pressure of said evaporator to increase said oil pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification