| 摘要 |
<p>A centrifugal impeller includes a hub formed about an axis of rotation (14) with a plurality of substantially radially extending blades (26) affixed to the hub. The blades have a height measured in a radial direction from the hub. An imaginary plane extending in a direction normal to the axis of rotation is used to define a cross-sectional view of the impeller. A first (22) and a second (22') concentric circle are formed in the plane with the center of the concentric circle being the axis of rotation. The first circle passes through a point on the hub located closest to the axis of rotation. The second circle has a radius greater than the first circle by an amount equal to five percent of the blade height, wherein a portion (24) of the hub extends outside of the second circle.</p> |
