Patent ID: 7156611
Filing Date: 2007-01-02
Classification: F04D

Abstract:
1. An axial-flow fan with double impellers comprising: a housing having an air channel therein, the air channel having a suction opening portion on one of axial-end sides thereof and a discharge opening portion on the other axial-end side thereof; a first impeller having a plurality of front blades and being adapted to rotate in the suction opening portion; a first motor to rotate the first impeller about an axis of the fan in one of two rotating directions; a second impeller having a plurality of rear blades and being adapted to rotate in the discharge opening portion; a second motor to rotate the second impeller about the axis in the other rotating direction opposite to the one direction; and a plurality of stationary blades radially extending and arranged stationary in the housing between the first impeller and the second impeller; wherein the number of the front blades is five, the number of the stationary blades is three, and the number of the rear blades is four.