Centrifugal fan

Details Centrifugal fan Centrifugal fan

2007-10-23

2007-10-23

Look, Edward K. (Department: 3745)

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

C415S206000

Reexamination Certificate

active

11044012

ABSTRACT:
A centrifugal fan is described. The centrifugal fan is suitable for a portable electrical apparatus. A tongue shape is formed from a volute sidewall of a casing of the centrifugal fan and non-parallel to a rotational axis of blades. Therefore, when the blades rotate to generate a wake flow to blow on a surface of the volute sidewall at the tongue shape, noise generated by the centrifugal fan can be decreased.

REFERENCES:
patent: 6254336 (2001-07-01), Ahn
patent: 6379111 (2002-04-01), Katoh et al.
patent: 6767184 (2004-07-01), Kim et al.
patent: 6953319 (2005-10-01), Sohn et al.
patent: 7144219 (2006-12-01), Hancock

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