To prevent a compressor restarted during an operation of a compressing mechanism from being damaged, in a refrigerating device comprising a refrigerant circuit provided with the compressing mechanism composed of a plurality of the compressors.
An inflow block valve CV2 for blocking the inflow of a refrigerant to the second compressor 14b under suspension is disposed at a downstream of an oil separator 37 disposed in a discharge pipe 56 of the second compressor 14b having a discharge space 100 filled with the refrigerant compressed by a fluid machine 82 in a casing 70. A connection passage 42 is formed to connect an oil returning passage 38 connected with the first compressor 14a and an oil returning passage 38 connected with the second compressor 14b. When the second compressor 14b is stopped during the operation of the first compressor 14a, the refrigerant of the discharge space 100 in the second compressor 14b is sucked by the first compressor 14a through the connection passage 42.
COPYRIGHT: (C)2009,JPO&INPIT
Masaaki Takegami
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