| 摘要 |
PURPOSE: An axial flow fan is provided to increase a size of a wing of the axial fan under the substantially same environment, for increasing the amount of the wind and the pressure by the increased wing, thereby improving the blowing efficiency of the axial fan. CONSTITUTION: An axial flow fan(20) includes a boss(22) as a center of rotation, and a plurality of wings(24) extended from the boss outward, wherein each wing is formed with different heights in a front end part(Fc) and a rear end part(Fd) and the rear end part is more outwardly, that is, radially extended to have a larger diameter in comparison with the front end part. The front end part of each wing is positioned in a shroud(30) and draws a same rotation track in the shroud, and the rear end part is positioned in a curvature(Ra) of the shroud and draws a same rotation track in the curvature, so that no interference is generated with relation to the shroud when the axial fan rotates.
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