| 摘要 |
PURPOSE:To reduce the cost, by molding a fan blade for a blower with resin and forming the inside of the blade to a hollow. CONSTITUTION:Four sheets of fan blades, being integrally molded in a boss part 1 of a fan for a blower, consist of resin of polypropylene or the like. The fan blade 2, having a fixed thickness, forms its inside to a hollow. A hollow part 30 of the fan blade is formed by using a slide core, nest core, etc. when the fan blade is molded. Consequently, the fan, reducing weight of the fan blade and decreasing centrifugal force by a decrease of the weight, enables the durability to be improved while the material to be saved.
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