| 摘要 |
<p>In a centrifugal compressor, a housing 6 has an annular treatment cavity 8 in a shroud wall 5. The shroud wall 5 has a first opening 9 providing communication between an installed zone of an impeller 1 and the treatment cavity 8, and a second opening providing communication between the treatment cavity 8 and a zone upstream of the first opening so as to circulate air a during a low-flow-rate operation. Louvers 11 are arranged in the second opening 10 in circumferentially equidistantly spaced apart relationship with each other and inclined reversely to a rotative direction of the impeller 1 so that the air a sucked to the treatment cavity 8 is, when discharged through the second opening 10, subjected to directional flow guide action with a whirling direction reverse to the rotative direction of the impeller. <IMAGE></p> |
