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。

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.

youdao

叶轮与外转子电机构成整体， 成为叶轮轮毂的驱动电机被气流高效地冷却，可以延长风机寿命。

The impeller is integrated into the external rotor motor so that the motor is equal to a wheel hub. So the motor can be cooled by the airflow efficiently to prolong life.

youdao

在进行经济技术性分析后，最终确定风机的设计方案，进而确定通风机适当的级型式、叶轮尺寸、轮毂比、转速和叶片数等基本参数。

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.

youdao