Patent ID: 8915717

Claim:
An impeller wheel for a ventilator that is rotatably supported about a central axis, the impeller wheel comprising: a hub; vanes arranged on the hub and each having a radial length, wherein the vanes each have an airplane wing profile shape comprising a rounded leading edge and a trailing edge, wherein the vanes taper in accordance with the airplane wing profile shape from the rounded leading edge approximately to a point at the trailing edge; wherein the vanes each have across the radial length a group of profiled sections, viewed in cylindrical section through the vane, that are at least similar to each other; wherein a radial outermost profiled section of the group of profiled sections that is positioned in a cylindrical enveloping surface of the impeller wheel has a first displacement in an axial direction of the impeller wheel relative to a first profiled section of the group of profiled sections which first profiled section is neighboring the outermost profiled section inwardly in the radial direction; wherein the first profiled section has a second displacement in the axial direction of the impeller wheel relative a second profiled section of the group of profiled sections that is neighboring the first profiled section inwardly in radial direction; wherein the first displacement is greater than the second displacement for forming a radial outer end area of the vane that has a greater incline than the remaining part of the vane.