| 摘要 |
PURPOSE:To prevent a fan from degrading its performance and increasing its noise by forming a bend bent to the upstream side of wind on an end of a fan blade. CONSTITUTION:A plurality of blades 23 are disposed on the outer periphery of a boss 24, and ends of the blades 23 are bent to the upstream side of wind to form a bend 25 respectively. The blade 23 is bent by an angle theta in the rotational direction of the blade 23. A distance between a bend starting point P on the end of blade and the side of the blade 23 is beta and the width of blade is alpha. Thus, swirl generated in a tip clearance section is reduced compared with that of a conventional fan, the wind amount of the fan can be increased and the noise can be reduced.
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