Impeller for a cooling fan

Details Impeller for a cooling fan Impeller for a cooling fan

2011-08-16

2011-08-16

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Diverse impellers or working members

C416S203000, C416S228000

Reexamination Certificate

active

07997871

ABSTRACT:
An impeller (10) for a cooling fan includes a hub (20) having a circular wall (22) and an annular sidewall (24) extending downwardly from a rim of the circular wall, and a plurality of blades (30) extending radially from the sidewall of the hub. Each of the blades includes a first portion (32) near the hub and a second portion (34) away from the hub, wherein each of the first portions is identical to an adjacent one of the first portions, and each of the second portions is different from an adjacent one of the second portions regarding a height thereof, thereby reducing a noise level of the impeller when the it operates.

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