Patent ID: 7600974

Claim:
A radial blade wheel, comprising: blades; a first wall connected with the blades and having an opening for enabling a flow through the wall to the blades; and a second wall connected with the blades, by which the radial blade wheel may be connected with an apparatus configured to rotate the radial blade wheel; and wherein the blades protrude in a radial direction to a diameter which diminishes at intervals from the first wall towards the second wall such that a diameter of the blades at the first wall is larger than a diameter of the blades at the second wall; and wherein the blades comprise, in the vicinity of the first wall, a first section where the radial protrusion of the blades remains unchanged towards the second wall, and the blades comprise, in the vicinity of the second wall, a second section where the radial protrusion of the blades remains unchanged towards the first wall.