| 摘要 |
To provide a centrifugal compressor having a high pressure ratio, which can achieve a large flow rate while suppressing a decrease in efficiency, the centrifugal compressor being adapted to compress and discharge a gas, which has been sucked in by rotation of an impeller (10) pivotally supported in a casing (11), mainly by centrifugal force, the inlet radius/outlet radius ratio (R1/R2) of the impeller (10) is set at 0.7‰¦R1/R2‰¦0.85, and the inclination angle ( ¸ ) of a back board portion in a hub (10a) of the impeller (10) is set at 5° ‰¦ ¸ ‰¦ 15° . |
