An electrically driven fan

Abstract

Abstract 1,139,984. Securing impellers on shafts; bearings; lubricating. IMC MAGNETICS CORP. 12 July, 1967 [20 Dec., 1966], No. 32069/67. Headings F2A and F2U. [Also in Divisions F1 and H2] In an electrically-driven fan, an assembly comprising an induction motor rotor 21, a fan impeller 26 and a connecting sleeve 29 having a porous bearing 35 fixed therein, is mounted on a stationary shaft 18. The assembly is secured against axial movement by a snap ring 36 and associated spacer washers 37, and by an axial thrust bearing formed by the end 44 of the shaft and a nylon disc 41. The latter is mounted in a cap 38 secured axially by a snap ring 43. The impeller is preferably of plastics material. The outer surface of portion 30 of sleeve 29 has serrations thereon to secure the impeller 26, and the sleeve is cemented to the rotor. The sleeve is of good heat-conducting material, e.g. aluminium, and has an exposed flange 31 so that heat is transmitted from the bearing and rotor, through the sleeve to the air surrounding the flange. The porous bearing may be formed by sintering a mixture of graphite and bronze powders. The bearing, a contacting felt ring 39 and a felt pad 40 are loaded with lubricating oil and are so arranged that during fan operation excess oil flows centrifugally from the bearing into the pads. If the bearing becomes dry it absorbs oil from the pads which can be recharged by a syringe through a hole 46. The oil also lubricates the thrust bearing 41, 44.

Inventors

No inventors recorded.

Bibliographic Details