| 摘要 |
PURPOSE: A turbo fan is provided to generate equal or increased wind amount by equal or reduced power consumption and noise generation. The entire weight of the fan is reduced by making blades thin. CONSTITUTION: A turbo fan includes blades, each having a body part(41) of which all vertical projection surfaces are biased toward an upper part of a chord(C) connecting a front end point(O) to a rear end point(Z), and a front end vortex preventing part(42) protruded at a negative pressure surface part of the front end of the body part for forming a local negative pressure surface(35).
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