Patent ID: 6688849
Filing Date: 2004-02-10
Classification: B01F,B63H,F04D

Abstract:
In an impeller for rotation in a media of the type having a central hub, an inclined blade portion having an inner radial edge portion attached to the central hub, an intermediate blade portion adjoined to the inner radial edge portion on one side, a peripheral edge portion attached to and extending outwardly from the central portion, a leading edge portion, a trailing edge portion, a front face, and a rear face, the improvement comprising:said blade portion having a media-accelerating front face and a substantially varying slopes which increase from the leading to the trailing edge portions of the media-accelerating front face of the impeller, so that the front media-accelerating face of the blade portion is concave, to facilitate a gradual acceleration of the media as the impeller rotates wherein said blade portion has a tip portion that is bulbous.