| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that when an abnormal state that flash gas is generated at a refrigerant flowing out from a condenser occurs though a compressor is cooled though liquid injection buy using a liquid refrigerant flowing out from a condenser, a mixture refrigerant state occurs, an effect of liquid injection is lowered, the compressor is brought into an abnormal high temperature and damage occurs, in a conventional screw refrigerating device. SOLUTION: In a refrigerant circuit comprising a screw compressor 1; a condenser 2; an evaporator 3; an expansion valve 4, and a liquid pipe, the outlet side of the condenser 2 is connected to a liquid tank 7 through a liquid pipe 5a, and connected to the evaporator 3 through the liquid pipe 5a, which is connected to the upper part of the liquid tank 7 and in which the expansion valve 4 is located. Connection to a liquid injection port 8 of the compressor 1 is made through a liquid injection piping 9 connected to the under side 7a of the liquid tank 7.
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