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 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.
所述叶轮包括 叶片和轮毂，所述叶片与叶轮轮毂通过一弯拱形水平轴相连。
3
The fan comprises a frame, an impeller formed by a wheel hub and motive blades around the hub.