| 摘要 |
The purpose of the present invention is to facilitate the starting of a scroll fluid machine (1) which is a single plate-type compression machine-integrated expansion machine in which the low-stage-side compression section of a refrigeration device is configured together with a high-stage-side compressor. A refrigerant compressed by the compression section (3) of the scroll fluid machine (1) is sucked into a high-stage-side compression machine, and the high-pressure refrigerant compressed by the high-pressure-side compression machine is sucked into an expansion section (2). The scroll fluid machine (1) is provided with: a back-pressure chamber (52) formed on the rear surface (7c) side of a movable scroll (7), which is on the reverse side of the base surface (7b) of the movable scroll (7); an oil return passage (47) for causing the back-pressure chamber (52) and the discharge side of the compression section to be in communication with each other; and a check valve device (66) provided in the oil return passage (47) and configured so that the direction leading from a compression-side discharge chamber (22), which is on the discharge side of the compression section, to a lubricating oil chamber (26), which is on the back-pressure chamber side, is the flow-permitted direction. |
