| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ceiling fan that can increase wind velocity outside an outer peripheral end, and that achieves high air volume at low cost and low power consumption at low torque. <P>SOLUTION: The ceiling fan includes a wing-root section 6 and a swept wing section 7, wherein a vane chord length of the swept wing section 7 gets shorter toward the outer peripheral end, a distance r in a radial direction of the swept wing section 7 is 10-50% of the total length S of a blade, the maximum vane chord length Wa of the wing-root section 6 is 10-50% of the total length S of the blade, and a leading edge of the swept wing section 7 of a projected blade is kept located in a region more downstream than a leading edge boundary 13 to a rotating direction of the blade. The outer peripheral end where peripheral velocity is fast is made to be a shape of a swept wing, wherein a pressure rising effect by a centrifugal force in a radial direction can increase the rate of flow in a radially outward direction. Accordingly, fanning in a wide-range area with a simple shape can be achieved, thereby achieving the ceiling fan with the high air volume at low cost. <P>COPYRIGHT: (C)2012,JPO&INPIT |
