| 摘要 |
An axial flow impeller for reducing noise caused by air-flow has a structure to satisfy following eg. that &thgr; =( &thgr; tX &thgr; b)X(R-Rb)/ (Rt-Rb)+ &thgr;b where &thgr; ; camber angle, &thgr;t; camber angle at the end part of the wing, &thgr;b; camber angle at the wing boss, R; crosssectional half radius of the impeller, Rb; half radius of the wing boss, Rt; half radius of the impeller. Each parameter satisfies follow condition that &thgr; t=20-30≦̸, &thgr; b=27-30≦̸, and &thgr;t< &thgr;b.
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