Patent ID: 7165942
Filing Date: 2007-01-23
Classification: F04D

Abstract:
1. Fan impeller having an intake side and a delivery side and comprising a base plate and a plurality of fan impeller blades fastened to the base plate, the fan impeller blades being disposed substantially perpendicularly to the base plate and forming a substantially radial arrangement, in which each fan impeller blade has a front edge disposed radially outwardly and substantially perpendicular to the base plate, a rear edge disposed radially inwardly and substantially perpendicular to the base plate, an outer surface disposed on the delivery side of the fan impeller and an inner surface disposed on the intake side of the fan impeller wherein at least one elevation is at least one of disposed or formed on the outer surface of at least one part of the fan impeller blades and is spaced from the base plate and extending away from the base plate substantially diagonally from the front edge to the rear edge of the fan impeller blades.