| 摘要 |
The present invention relates to an axial flow fan which prevents the deformation of blades even when rotated at high speed, thus promoting the structural stability. The axial flow fan includes a hub and a plurality of blades, which are arranged along a circumferential outer surface of the hub in a radial direction such that the direction of a sweeping angle of each of the blades alternately changes between a blade root and a blade tip. A chord length, which is the length from a leading edge to a trailing edge of the blade, gradually reduces from the blade root to an intermediate portion of the blade, while the chord length gradually increases from a predetermined position on the intermediate portion of the blade to the blade tip.
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