| 摘要 |
PURPOSE: An axial flow fan is provided to increase an amount of wind flowing around a blade tip by gradually reducing a pitch angle formed between a blade hub and the blade tip in a direction of the blade tip. CONSTITUTION: An axial flow fan includes a hub(52), and a plurality of blades(54). The hub(52) is coupled with a rotating shaft of a motor. The blades(54) are arranged at predetermined interval around the hub(52). A first pitch angle of a blade hub(54e) is different from a second pitch angle of a blade tip(54f). The blade(54) has a pressure surface(54a), a negative pressure surface(54b), a leading edge(54c) and a trailing edge(54d). The blade hub(54e) and the blade tip(54f) are formed at inner and outer peripheral portions of the blade(54), respectively. A predetermined curvature is formed between the leading edge(54c) and the trailing edge(54d).
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