| 摘要 |
PROBLEM TO BE SOLVED: To provide a blower fan easy to take air in at an inner circumference side of the blade part, improving air intake efficiency by smoothly sending sucked air out to a centrifugal direction, suppressing fan noise by making air easy to separate from a blade part tip, and providing high air capacity and high static pressure with same fan noise level as compared with a conventional blower fan. SOLUTION: This invented impeller 1 is an impeller for a centrifugal blower fan provided with a cylindrical boss part 2 and a plurality of blade part 3 extending in roughly radial shape from an outer circumference surface of the boss part 2. The blade part 3 is provided with a forward blade part 4 extending from the outer circumference surface of the boss part 2 and bent in a concave shape in a view from front of a rotation direction of an impeller 1 and a backward blade part 5 extending from the outer circumference side end part of the forward blade part 4 and bent in a convex shape in a view from front of the rotation direction of the impeller 1. COPYRIGHT: (C)2006,JPO&NCIPI
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