| 摘要 |
PURPOSE:To reduce noise by forming the edge part of the vane of a motor fan so as to be a little round from the front surface to the back surface. CONSTITUTION:A motor fan 1 has a casing 2, vanes 3, and a motor 4. The vane 3 is formed to have the little roundness from the front surface R to the back surfaces S at the edge part. Because of the roundness, the arcuate form of the circle having the less radius than 1/2 of the thickness T of the vane is permitted. Therefore, the swirl generated between the edge part of the vane and the opposed wall is suppressed, and noise can be reduced.
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