| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To obtain an axial flow fan that reduces a blade passing frequency sound while keeping a ventilation performance and securing the strength of the blades. <P>SOLUTION: In the axial flow fan 80 including a boss 2 attached to a rotary shaft of a motor and a plurality of blades 10 that are radially disposed on the outer periphery of the boss 2 and send air in the axial direction, when, on a projected figure of the axial flow fan 80 on a plane orthogonal to the rotary shaft, a position of the rotation shaft is denoted by O, a boss-outer-periphery blade-chord-line midpoint of each of the blades 10 is denoted by Pb and a blade-outer-edge blade-chord-line midpoint of the each of the blades 10 is denoted by Pt, the boss-outer-periphery blade-chord-line midpoints Pb of the respective blades 10 are arranged at substantially equal intervals in the peripheral direction on the boss outer periphery, and an angleδθt formed by a straight line O-Pb and a straight line O-Pt at least in a part of the blades 10 is different from an angleδθt formed by a straight line O-Pb and a straight line O-Pt in the other blades 10. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
