Axial fan has flexible elements with bending stiffness so that blades are inclined at predetermined angle at which centrifugal forces acting on blades neutralize traction force applied on blades

摘要

Arms extending radially outward from a hub (1) contain flexible elements (7) with a specific bending stiffness so that the blades (12,12') are inclined at predetermined angle during operation, at which centrifugal forces (CF) acting on the blades neutralize traction force (TF) acting on the blades.