Patent ID: 6893212
Filing Date: 2005-05-17
Classification: F04D

Abstract:
1. Fan with an internal rotor motor with rapid fixing device for a fan wheel, for both centrifugal and axial fans, comprising a casing ( 12 ), containing an electric motor with internal rotor ( 13 ) connected to at least one fan wheel ( 14 , 14 ′), and enclosed by a protection grid ( 15 ) characterized in that a first coupling element ( 17 , 17 ′) is attached to one end of a motor shaft ( 16 ) of said electric motor with internal rotor ( 13 ), and second coupling element ( 23 , 23 ′) in a portion of said at least one fan wheel ( 14 , 14 ′) wherein said first and second coupling elements ( 17 , 17 ′, 23 , 23 ′) are complimentary to each other, have a polygonal type cross section, and are attached through reciprocal fixation means ( 26 , 27 , 29 ) said reciprocal fixation means ( 26 , 27 , 29 ) between said first and second coupling elements ( 17 , 17 ′, 23 , 23 ′) are composed of an elastic element ( 29 ) that is inserted in a stable manner in hollow portions ( 27 ) and throats ( 26 ) in one and the other between said first and second coupling elements ( 17 , 17 ′, 23 , 23 ′) that said first coupling element ( 17 , 17 ′) attached to an end of a shaft ( 16 ) includes a cylindrical extension ( 25 ) equipped with an external perimetric throat ( 26 ) being aligned with openings ( 27 ) inside said second hollow coupling element ( 23 , 23 ′) so to receive said elastic element ( 29 ).