FAN Russian patent published in 2010 - IPC F04D17/08 

FIELD: engines and pumps.

SUBSTANCE: invention relates to fan production and can be used in plenum-exhaust ventilation systems at industrial enterprises. Proposed fan comprises scroll housing with inlet and outlet branch pipes, impeller with vanes arranged in impeller disks, guide vanes, one being arranged in inlet branch pipe and another being located directly beyond impeller outline. Note that impeller disks have openings. Impeller vanes have spaces open on impeller face sides and are arranged in openings of disks at angle smaller than 50° to disk plane. Note also that housing incorporates additionally a rotary chamber arranged on the side opposite the inlet branch pipe.

EFFECT: higher rigidity of impeller, reduced sizes and higher efficiency.

4 dwg