| 摘要 |
PROBLEM TO BE SOLVED: To provide an impeller of a fan wherein weight-reduction and the productivity are improved, while the gas-volume performance and noise-reduction are preserved. SOLUTION: The impeller comprises a hub part (not shown) which is rotatably driven by receiving torque from the outside, and a plurality of airfoil blades 4 placed radially extendedly around the hub part. In order to ensure the form of the leading-edge of the each blade 4, at the time of reducing the thickness of the thick-wall part 17 in the blade 4, a mold core (not shown) for a reduced-thickness part 13 is slid linearly to mold the reduced-thickness part 13. The form of the thick airfoil leading-edge of the blade 4 is ensured. Consequently, the gas-volume performance is improved, and the noise-reduction is attained. Further, by reducing the thickness of the thick-wall part 17 in the leading edge 5, production in the thin-wall molding-method can be attained, and the production is stably performed. Since the thin-walled blade can be molded all over the blade area, the weight of the single blade 4 can be reduced. COPYRIGHT: (C)2007,JPO&INPIT |
