| 摘要 |
PROBLEM TO BE SOLVED: To manufacture an axial flow fan rapidly, in low costs, and suitably by disposing a hub part, and a plurality of wall thickness blade parts which extend from an outer peripheral surface to an outside of a radial direction, and which is disposed so as to generate axial flow while rotating, and forms a plurality of blade part layers wherein each of wall thickness blade parts are laminated with each other in a blade part air blowing surface direction. SOLUTION: A fan is formed of three wall thickness blade parts 3 extending to a radial diameter outside direction disposed around a hub 2. The each wall thickness blade part 3 is composed of a blade layer 3a molded beforehand, and a blade layer 3b which is integratedly molded with injection molding around the blade part layer 3a. And a leg part 3c is arranged to carry out positioning when the blade part layer 3a is arranged in a mold. When each of blade part layers 3a, 3b are formed, after at least one of blade part layer is molded beforehand, resin is injection-molded thereto, and the other blade part layer is laminated. A cooling cycle after injection molding is shortened, and recess generated when the wall thickness blade part 3 is molded and a foam phenomenon are avoided. Simultaneously, one side of the blade part layer is easily inserted and arranged.
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