Axial fan, particularly for cooling system of railway vehicle, comprises paddle wheel driven by prime mover, where air or gas is used as driving medium, and free end of paddle blade has irregularities on wetted surface

摘要

The axial fan comprises a paddle wheel (1) driven by a prime mover (10), where air or gas is used as the driving medium. A free end of a paddle blade (1.1) has irregularities on the wetted surface. The irregularities include holes, slots, elevated regions or hollow regions. A housing (2) has an inner surface (5) which encloses the paddle wheel.