Patent ID: 6736601
Filing Date: 2004-05-18
Classification: F01D,F04D

Abstract:
An impeller (1) for an axial flow fan comprising a hub (2) supporting the blades (3), the hub (2) having bores (5) in its peripheral surface, whereby each bore (5) has a first radially inner section (10) with larger diameter than a second radially outer section (6), each blade (3) having a substantially circular foot section (4) allowing adjustment of the blade pitch, each blade foot section (4) being mounted in a corresponding bore (5) by means of connecting plates engaging with a shoulder (11) between the two bore sections (6, 10), characterized in that each blade foot section (4) is mounted by means of two connecting plates (8, 9) which in the first bore 1S section (10) are spaced apart and face each other along substantially the entire diameter of the bore (5).