F - Mech Eng,Light,Heat,Weapons – 17 – D
Patent
F - Mech Eng,Light,Heat,Weapons
17
D
230/27
F17D 1/07 (2006.01) F01M 11/12 (2006.01) F04C 23/00 (2006.01) F04C 29/02 (2006.01) F16N 19/00 (2006.01)
Patent
CA 1178563
OIL EQUALIZATION SYSTEM FOR PARALLEL CONNECTED COMPRESSORS ABSTRACT OF THE DISCLOSURE Parallel connected compressors are provided with an oil management scheme in which an oil equalization port on one compressor is connected via an oil return solenoid operated valve within a small diameter line to an injection port of a second compressor, and vice versa. When the oil level in one compressor drops to a level sensed by an oil float switch, the oil float switch changes state, the oil return solenoid operated valve is opened, feeding its injection port and energizing a one minute on delay timer. Failure of the oil float switch to reset itself causes the com- pressor to go off on oil failure, and the oil return solenoid operated valve is closed. If the oil float switch resets itself at any time during the first minute, upon resetting, an off delay timer is energ- ized to keep the oil return solenoid operated valve open for an additional minute, and the compressor continues to operate.
398992
Gianni Sebastian J.
Schaefer Donald D.
Dunham-Bush Inc.
G. Ronald Bell & Associates
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