Patent ID: 8172524
Filing Date: 2012-05-08
Classification: F04D

Abstract:
1. A fan comprising: an impeller arranged to be rotatable about a rotation axis and including a plurality of rotating vanes, the impeller taking air in and discharging the air in an axial direction parallel or substantially parallel to the rotation axis by rotation thereof; a motor arranged to rotate the impeller; an outer casing including an inner peripheral surface which surrounds the impeller; a supporting body arranged substantially at a center inside the outer casing and supporting the motor; and a plurality of stationary vanes arranged about the rotation axis to axially face the rotating vanes and to connect the outer casing to the supporting body, wherein at least in a portion of each of the plurality of stationary vanes in a radial direction perpendicular to or substantially perpendicular to the rotation axis, an axial distance of the stationary vane from one of the rotating vanes closest thereto and a slant angle thereof with respect to the axial direction increase as the stationary vane moves outwardly in the radial direction; and a length of a chord between an upper edge and a lower edge of each of the plurality of stationary vanes decreases as the plurality of stationary vanes move outwardly in the radial direction.