Invention Grant
US07918651B2 Fan and impeller thereof 有权
风扇及其叶轮

Fan and impeller thereof
Abstract:
An impeller includes a hub, a plurality of first blades, and a plurality of second blades. The first blades are disposed around the hub. The second blades are disposed between the first blades. The lengths of the second blades are shorter than those of the first blades. The impeller can avoid the airflow reflux and have good airflow efficiency.
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