Axial ventilation fan blade fixture - has blade root shape corresponding to hub crown recesses, and radial root slots

摘要

Blade fixture on an axial running impeller for fans and blowers with adjustable blades made of light material, has the hub body as an original shaped part or as a converted shaped unit. The shape of the blade root (3) corresponds with the shape of recesses (27) in the hub crown (1) of an originally shaped hub body, with a shape stamping of the hub crown of a converted hub body, or with the shape stamping of a clamp ring. The blade root (3) or shape stamping has radially arranged slots (14), the root (3) projects into the recesses (27) and/or the clamp ring, and the edge of the hole (28) in the hub crown (1) rests in the circular groove (4) of the blade root.