| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw refrigeration unit, capable of efficiently cooling the inside of a bearing part and a rotor chamber without increasing leak of refrigerant in a middle pressure part of a screw compressor. SOLUTION: The screw refrigeration unit 1 comprises a circulating passage I for circulating refrigerant, in which the screw compressor 2, a condenser 3, an expansion valve 4 and an evaporator 5 are interposed. This unit further comprises a branch passage II for guiding the refrigerant from the circulating passage I to bearing parts 10 and 9 on the discharge side and suction side of the screw compressor 2, and an intermediate passage III for guiding the refrigerant introduced to the discharge-side bearing part 10 to the circulating passage I or the middle pressure part of the rotor chamber 6 of the screw compressor 2. COPYRIGHT: (C)2007,JPO&INPIT
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