| 摘要 |
PROBLEM TO BE SOLVED: To provide a lightweight low cost propeller fan in which stress acting on members is low. SOLUTION: In a propeller fan 100 provided with a boss part fixed on a rotary shaft 5 of a motor, a circular main plate part 2 joined to the boss part 4, and a blade 10 including a joint part 3 extending radial direction outward from the main plate part 2 and a blade 1 extending radial direction outward from the joint part 3 and blasting air to a rotary shaft 5 direction, axial direction distance h is set to keep a product an outer diameter of the blade and the axial direction h to a center of gravity 6 of the blade 10 from an axis perpendicular surface R passing a joint point P of the boss part and the main plate part 2 to an effective value determined based on yield stress of material of the blade 10 or less. COPYRIGHT: (C)2008,JPO&INPIT
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