Patent ID: 7273354
Filing Date: 2007-09-25
Classification: F04D,Y10S

Abstract:
1. An axial fan ( 1 ), rotating in a direction (V) in a plane (XY) about an axis ( 2 ), comprising a central hub ( 3 ) with a centre ( 0 ) and a radius Rmin, a plurality of blades ( 4 ) each having a root ( 5 ), a tip ( 6 ) which extends to a tip radius (Rmax), the blades ( 4 ) being delimited by a concave leading edge ( 7 ) and a convex trailing edge ( 8 ), and being formed by several aerodynamic profiles ( 12 - 16 ) relative to sections at various intervals along the radial extension of a blade ( 4 ), each profile ( 12 - 16 ) being formed by a centre line (L 1 ) which is continuous without points of inflection or cusps, the axial fan being characterised in that the length of the centre line (L 1 ) for each profile ( 12 - 16 ) is defined by a percentage range relative to the maximum radius Rmax of the fan ( 1 ) as indicated in the following table: