Axial fan unit having reduced noise generation

Details Axial fan unit having reduced noise generation Axial fan unit having reduced noise generation

2011-05-24

2011-05-24

Nguyen, Ninh H (Department: 3745)

Rotary kinetic fluid motors or pumps

Plural runners supported for relative motion or on separate...

C415S199500, C415S211200, C415S220000

Reexamination Certificate

active

07946804

ABSTRACT:
An axial fan unit includes two or more impellers accommodated in a housing. Each impeller has a plurality of blades disposed about a center axis and is rotated by an associated motor. The rotation of the impellers creates a flow of air generally flowing along the center axis. A plurality of ribs are disposed between the impellers and connected to the housing. The ribs support an associated motor. At least one of an air-inlet side edge and an air-outlet side edge of each rib is inclined with respect to a direction that is perpendicular or substantially perpendicular to the center axis, such that it gets closer to one of an air-inlet side end and an air-outlet side end of the axial fan unit as it moves away from the center axis.

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Official communication issued in counterpart Chinese Application No. 200710139846.3, issued on Jan. 23, 2009.

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