| 摘要 |
In a compression/expansion unit ( 30 ) serving as a fluid machine, both of a compression mechanism ( 50 ) and an expansion mechanism ( 60 ) are contained in a single casing ( 31 ). A shaft ( 40 ) coupling the compression mechanism ( 50 ) to the expansion mechanism ( 60 ) has an oil feeding channel ( 90 ) formed therein. Refrigerating machine oil accumulated at the bottom of the casing ( 31 ) is sucked up into the oil feeding channel ( 90 ) and fed to the compression mechanism ( 50 ) and the expansion mechanism ( 60 ). The refrigerating machine oil fed to the expansion mechanism ( 60 ) is discharged from the expansion mechanism ( 60 ) together with the refrigerant after expansion, flows through the refrigerant circuit and then flows back to the compression mechanism ( 50 ) in the compression/expansion unit ( 30 ). |
