Refrigeration – Automatic control – Refrigeration producer
Patent
1991-01-15
1993-02-02
Wayner, William E.
Refrigeration
Automatic control
Refrigeration producer
62 84, 62217, F25B 3100
Patent
active
051829193
ABSTRACT:
An oil recovery system for a closed type centrifugal refrigerating machine. The refrigerating machine includes a compressor that has an oil sump below the suction side thereof, a condenser that liquefies compressed refrigerant gas by cooling, an evaporator that evaporates the liquefied refrigerant, a suction volume control valve that controls the volumetric flow of refrigerant gas sucked into the compressor from the evaporator, recovery means for recovering oil from the oil sump to an oil tank in a lubricating system, and control means for starting or stopping the compressor in accordance with the magnitude of refrigeration load. The oil recovery system comprises valve opening control means for controlling the opening of the suction volume control valve such that a decrease in the amount of oil recovered to the oil tank is compensated for when the number of times of start or stop of the compressor per unit of time exceeds a set number.
REFERENCES:
patent: 4213307 (1980-07-01), Watson
patent: 4671081 (1987-06-01), Fujiwara et al.
patent: 4932215 (1990-06-01), Kanazawa et al.
Ebara Corporation
Wayner William E.
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