VENTILATORS UNIT Russian patent published in 1994 - IPC

FIELD: ventilators manufacturing. SUBSTANCE: ventilators unit has a housing in which working wheels with electromotors are mounted in sequence. The blade of each wheel is attached to a hub in such a manner that each blade may be either removed from the hub turning or positioned within it. A bore is made on the hub end for disposing blades in it so as to define circumferential and central part of the hub. At the circumferential part of the hub recesses are formed which are profiled to conform the profile of the blade root section. At the central part of the hub radial apertures are formed adopted to receive the blades roots. The blades are fitted with torsion springs which have some ends attached to the hub and the other ends placed in the apertures made in the blades roots. The blades are deepened under springs action and are actuated under centrifugal forces action. EFFECT: maintenance reliability. 4 dwg