How to make a sirocco fan's mold and a sirocco fan mactured by that method

摘要

The present invention relates to a sirocco fan manufactured by a method of producing a sirocco fan and a sirocco fan produced by the method. The sirocco fan produced by the prior art has a wider end portion wider and a smaller wing width Therefore, there is a problem in that flow noise is greatly affected by a very high speed deviation. In addition, there is a problem in that a wing portion is formed on the cavity mold side to couple the cavity mold and the core mold. Supplying a liquid into the mold through the gate and cooling the resin; Wherein the core mold is first separated during molding and the outer side of the abacus is pushed with a few number of mil pins formed on the cavity side to perform the manufacturing steps in the order of the manufacturing step. And the circular ring is assembled by high-frequency welding to the rear surface of the main plate side of the sirocco fan, thereby narrowing the blade tip toward the main plate side from the suction port surface and widening the distance between the blades. Since the width of the wing of the sirocco fan injection-molded by forming the blade mold is narrow in the dead zone area and widened toward the main plate side, the blowing performance is improved and the discharge speed is stabilized to achieve low noise and high efficiency .