CENTRIFUGAL FAN Russian patent published in 1999 - IPC

FIELD: ventilation equipment. SUBSTANCE: fan includes helical body, impeller with vanes and covering disc. Suction branch pipe with curvilinear generatrix forms circulation gap between outer surface of branch pipe and inner surface of disc. Guiding device is in the form of flat plate joined with outer surface of branch pipe. Optimal angular parameters of plate and gap are given in description of invention. Plate prevents occurring of toroidal flow in circulation chamber and promotes formation of stream directed along inner surface of disc for increasing zone of continuous flowing around. EFFECT: enhanced efficiency. 2 cl, 4 dwg