Patent ID: 6402473
Filing Date: 2002-06-11
Classification: F04D,Y10S

Abstract:
A centrifugal impeller mounted to rotate on an axis, said impeller comprising a plurality of radially extending blades, said impeller being characterized by a cylindrical area ratio between 1.0 and 1.5, said blades being characterized by:a) a high positive camber at a radially inward region of the blade, said positive camber having a maximum value of at least 10% of the blade chord and said maximum value occurring at x/C<0.5; b) a large trailing edge angle of at least 70 degrees but less than 135 degrees with respect to the impeller tangent; and c) a top shroud surface connected to the impeller blades, covering at least a substantial portion of the chord length of the impeller blades.