Patent ID: 6341940
Filing Date: 2002-01-29
Classification: F04D,Y10S

Abstract:
An axial fan comprising:a hub, the axis of which coincides with the axis of rotation of the fan, and a plurality of blades which extend from the hub between a minimum radial distance from the axis in the vicinity of the hub and a maximum radial distance, each blade having a cross-section which has a respective angle of attack and a respective angle of curvature, wherein in the vicinity of the hub, the cross-section of each blade has an angle of attack and an angle of curvature which are substantially equal to 0Â°, and, starting from the hub, the cross-sections of each blade have angles of attack and angles of curvature which increase as the radial distance from the axis increases, up to a radial distance of between 30% and 40% of the radial extent of the blade.