| 摘要 |
<p>A fan includes a fan casing and an impeller installed inside the fan casing, wherein the outer diameter of an upper plate of an impeller blade is greater than the outer diameter of a main plate. Therefore, the fan operates at the peak efficiency of a motor without changes in the number of revolutions of the motor through the processed impeller blade without changes in the fan casing, the main plate, and the upper plate, thereby reducing the power consumption.</p> |
