To improve the reliability by setting a rate of the lubricating oil to be returned from an accumulator to each compressing mechanism higher in an upper compressing mechanism.
An oil return hole 16 of a suction tube 12 of an accumulator 11 connected to an upper compressing mechanism 3 is provided at a position higher than an oil return hole 17 of a suction tube 13 connected to a lower compressing mechanism 4. With this structure, in the lubricating oil including the liquid coolant staying in a bottom part of the accumulator 1, the lubricating oil of a relatively high part having a high rate of the lubricating oil can be returned to the upper compressing mechanism 3 easy to be short of the lubricating oil more than the lower compressing mechanism 4, and the reliability can be improved.
MATSUNAGA HIROSHI
HASHIMOTO YUSHI
KANZAKI HIDEYUKI
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