AXIAL-FLOW FAN Russian patent published in 1994 - IPC

FIELD: manufacture of fans. SUBSTANCE: fan has cylindrical housing which receives the impeller mounted on electric drive shaft. Electric drive is secured on housing by means of bush embracing it. Bush is provided with radial projections. On the interior of the housing there are bosses according to the number of projections of bush. Outer surface of each projection and inner surface of respective boss are made in form of engageable spheres of one diameter whose center is located on the fan axis. EFFECT: enhanced efficiency. 2 dwg