Counter-rotating axial-flow fan

Details Counter-rotating axial-flow fan Counter-rotating axial-flow fan

2006-09-13

2008-11-04

Verdier, Christopher (Department: 3745)

Rotary kinetic fluid motors or pumps

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

With means for selective runner operation or drive shaft...

C415S068000, C415S193000, C415S213100, C415S214100, C415S220000, C415S208200, C415S209100, C415S211200, C416S125000, C416S128000, C416S203000

Reexamination Certificate

active

07445423

ABSTRACT:
A first motor25rotates, in one of two rotating directions, the first impeller7including a plurality of front blades28in a suction opening portion15of a housing59. The second motor49rotates, in the other rotating direction opposite to the one rotating direction, the second impeller35including a plurality of rear blades51in a discharge opening portion57of the housing59. A plurality of stationary blades61are arranged between the first impeller7and the second impeller35in the housing59. When the number of the front blades28is N, that of the stationary blades61is M, and that of the rear blades51is P, their relationship is defined as N>P>M. A length L1of the front blades28measured in an axial direction is set longer than a length L2of the rear blades51measured in the axial direction.

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