Patent ID: 7210907
Filing Date: 2007-05-01
Classification: F04D

Abstract:
1. A centrifugal fan impeller ( 1 ) having an axis of rotation ( 6 ) and comprising one or more modules ( 2 ), comprising a mounting disc ( 4 ), at least one connecting ring ( 5 ) and a plurality of blades ( 3 ) extending between the mounting disc ( 4 ) and the connecting ring ( 5 ), the blades ( 3 ) being connected to the disc ( 4 ) and ring ( 5 ) at an angle (α) relative to the axis ( 6 ) of the impeller ( 1 ), the impeller being characterised in that the angle (α) at which the blades ( 3 ) are inclined is 10 degrees, in that the connecting ring ( 5 ) is positioned on an outer diameter in respect to the blades ( 3 ), whereby the inner part of the mould for producing the fan impeller ( 1 ) can be extracted axially from both sides of the fan impeller ( 1 ), in that the profile of each blade ( and in that the profile of each blade (