Refrigeration system on/off cycle

Details Refrigeration system on/off cycle Refrigeration system on/off cycle

1978-04-25

1980-01-01

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

62196B, 62473, 62510, 418 84, F25B 4302

Patent

active

041809866

ABSTRACT:
A positive displacement compressor, such as a helical screw rotary compressor without capacity control element, is coupled in a refrigeration loop main line between the evaporator and an oil separator and upstream of the condensor. To unload the screw compressor at low evaporator load, any refrigerant discharging from the compressor is bypassed by a line connecting the suction and discharge sides of the screw compressor, and main line connection from the evaporator to the screw compressor is shut off such that the driven, unloaded screw compressor pulls oil from the separator through a restrictor and oil injection port and some refrigerant vapor which passes to the evaporator side through the screw compressor bypass line. As the evaporator pressure increases, the evaporator is connected through a restrictor within the main line to the screw compressor suction. As the evaporator load increases, normal operation returns, with the bypass line being closed and oil fed from the oil separator to the screw compressor injection port bypassing the restrictor for that oil line.

REFERENCES:
patent: 3408826 (1968-11-01), Soumerai et al.
patent: 3822564 (1974-07-01), Nijo et al.
patent: 4063855 (1977-12-01), Paul

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