| 摘要 |
This centrifugal compressor (1) has an impeller (3) and a casing (3) housing the impeller (3). The casing (2) has an intake (6), an impeller housing unit (14) where the impeller (3) is arranged, an annular flow path (5) formed around the impeller (3), an outlet (9) communicating with the annular flow path (5), an annular space (11) formed around at least one of the intake (6) and the impeller housing unit (14). On the inner peripheral surface (2a) of the casing (2) facing the impeller housing unit (14), a groove (12) communicating between the impeller housing unit (14) and the annular space (11) is formed over the entire circumference of the inner peripheral surface (2a). Further, the annular space (11) communicates with another space only via the groove (12). |
