Pumps – Condition responsive control of pump drive motor – Having timer or delay means
Patent
1981-07-06
1983-05-17
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
Having timer or delay means
417426, 418 84, 418 87, 418 86, 62193, 62510, F25B 3102, F25B 104, F04B 4904, F04B 3902
Patent
active
043838022
ABSTRACT:
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 compressor 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 energized to keep the oil return solenoid operated valve open for an additional minute, and the compressor continues to operate.
REFERENCES:
patent: 2253623 (1941-08-01), Jordan
patent: 3033009 (1962-05-01), Berger et al.
patent: 3633377 (1972-01-01), Quick
patent: 3777509 (1973-12-01), Muerch
patent: 4180986 (1980-01-01), Shaw
Gianni Sebastian J.
Schaefer Donald D.
Dunham-Bush, Inc.
Freeh William L.
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