| 摘要 |
PURPOSE:To stabilize the finished dimension of the molded vane wheel, realize conversion to a light weight and low noise and to improve the performance together with the strength by forming the vane wheel through blow molding and pouring foaming material into a hollow space after forming the vane wheel in a body provided with said hollow space. CONSTITUTION:The vane part 2 and the boss part 4 are formed integrally through blow molding, and the vane part 2 is molded into the hollow body (hollow part 5) as shown in the drawing, then foaming material 6 is poured into said hollow part 5. The vane wheel equipped with the streamlined vane part 2 which is obtained by the method described the above has little risk of generation of shrink, and the edge part 3 can be form easily, thus the finished dimension after molding is stabilized. Also the balance in ventilation is improved, and noise can be reduced. Further, as the vane part 2 molded in a hollow body, the weight can be reduced. Through injection of the foaming material 6 into the hollow part 5, the strength can be also increased, duly the performance is improved. |
