Counter-rotating axial-flow fan

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

2011-03-22

2011-03-22

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

07909568

ABSTRACT:
A first motor rotates, in one of two rotating directions, the first impeller including a plurality of front blades in a suction opening portion of a housing. The second motor rotates, in the other rotating direction opposite to the one rotating direction, the second impeller including a plurality of rear blades in a discharge opening portion of the housing. A plurality of stationary blades are arranged between the first impeller and the second impeller in the housing. When the number of the front blades is N, that of the stationary blades is M, and that of the rear blades is P, their relationship is defined as N>P>M. A length L1of the front blades measured in an axial direction is set longer than a length L2of the rear blades measured in the axial direction.

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