| 摘要 |
A centrifugal compressor in which frequency of noise produced by rotation of the impeller does not resonate with natural frequency of vibration of gas in a plurality of axial slots serving to increase gas flow rate in an operation range of increased gas flow rate and broaden stable operation range in an operation range of decreased gas flow rate is provided. The axial slots are formed between the peripheral part of the inlet passage of the compressor housing by the peripheral surface of the inlet passage and an annular ring part of the housing supported by a plurality of struts extending from the peripheral surface, four or more struts are provided to support the annular ring part, and all but one are located at positions determined when all the struts are located at circumferentially equal spacing and the one strut is shifted from the positions by a certain angle. |
