Patent ID: 6238184
Filing Date: 2001-05-29
Classification: F04D,Y10S

Abstract:
An axial fan comprising:a central hub, anda plurality of blades extending radially from the hub and each having:a root portion adjacent the hub,a radially intermediate portion, anda radially outermost, tip portion, the leading edge of each blade in the tip portion being inclined forwardly in the direction of rotation of the fan,in the root portion the leading edge of each blade being inclined forwardly in the direction of rotation of the fan and, in the intermediate portion, the leading edge being inclined rearwardly,wherein the skew angle of the leading edge in the root portion of each blade adjacent the hub is between 20.degree. and 35.degree., andwherein the root portion of each blade extends in the radial direction at most up to about 1/3 of the radial extent of the blade.