Patent ID: 6814542
Filing Date: 2004-11-09
Classification: F04D

Abstract:
A blower, including:a) a blower housing (10) including a guide surface (22) that defines the exterior limits of a flow channel (24); b) a hub (14) that is mounted in the blower housing (10) so as to be rotatable about an axis of rotation (12) and having a hub surface (18) that defines the interior limits of the flow channel (24); c) a rotary drive (20) for the hub (18) which is disposed within the hub (14); d) the blades (16) of the hub (18) are configured as radial blades with cylindrical surfaces extending parallel to the axis of rotation (12) and curved backwards against the direction of rotation; and e) the guide surface (22) and the hub (14), in the blade zone between the leading edge (34) of the blade and the trailing edge (36) of the blade, viewed in the direction of flow, have a generally conical or slightly curved and widening shape, and the area of the cross-section of flow along the flow channel (24) being one of constant cross-section or of reduced cross-section, wherein the blade leading edges (34) project axially upstream ahead of the hub (14) in the direction of the entry opening (28).