Final design scheme is confirmed after economic and technical analyse. Then, axial fan 's stage type, impeller diameter, hub ratio , specific speed and the number of blades are decided.
The fan comprises a frame, an impeller formed by a wheel hub and motive blades around the hub.
一 叶轮，具有一轮毂及多个环设于该轮毂周围的动叶片；
3
The impeller comprises a blade and a hub, wherein the blade is connected with the hub of the impeller through a level shaft in a shape of a bended arch.