| 摘要 |
PROBLEM TO BE SOLVED: To keep oil amounts of a plurality of compressors proper, and to reduce a pressure loss. SOLUTION: By directly injecting return lubricating oil into a refrigerant suction pipe conduit 27 instead of distribution of the lubricating oil by an accumulator, the pressure loss by the accumulator is reduced. By forming branch flow passage parts 35 of a branch joint 31 around a flow passage axis of a common flow passage part 33 symmetrically to each other, a difference of a pressure loss of each branch flow passage part 35 is reduced to distribute the lubricating oil according to a suction amount of a gas refrigerant of each compressor 5. Thereby, the lubricating oil of a proper amount can be supplied to each compressor 5 without providing the accumulator, and the pressure loss of the accumulator can be reduced. COPYRIGHT: (C)2006,JPO&NCIPI
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