Gas injection system for screw compressor

Details Gas injection system for screw compressor Gas injection system for screw compressor

1986-05-14

1988-03-01

Vrablik, John J.

Refrigeration

Automatic control

Refrigeration producer

62513, 418 15, 418100, 418201, 417310, F25B 4104, F04C 1816, F04C 2908, F04B 4902

Patent

active

047277254

ABSTRACT:
A refrigerant gas injection system for a refrigeration cycle of the type having a screw compressor provided with a slide valve for controlling the compression capacity of the screw compressor, an economizer disposed in a passage for refrigerant liquid and adapted for subcooling the refrigerant liquid by the refrigerant of a reduced pressure, and a refrigerant gas injection line through which the refrigerant gas generated in the economizer is injected into the compression chamber of the screw compressor in its compression phase. The refrigerant gas injection system has a gas injection controller adapted to enable the injection of the refrigerant gas when the screw compressor is operating at full (100%) capacity or load level and to prevent the injection of the refrigerant gas when the screw compressor is operating in unloaded state.

REFERENCES:
patent: 4005949 (1977-02-01), Grant
patent: 4062199 (1977-12-01), Kasahara et al.

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