CENTRIFUGAL FAN Russian patent published in 1999 - IPC

FIELD: centrifugal fans for axi-symmetrical flows. SUBSTANCE: fan includes bearing plate, electric drive on whose shaft impeller having diameter "d" is mounted, cover and main disks. Suction branch pipe forms confuser clearance together with disk which is used to connect impeller inlet with cavity of circular casing formed by branch pipe, cylinder with specific size d₁ and ring mounted at clearance d₂ = (0.05-0.10)d. d₁ = (1.05-1.5)D; ring overlaps blades by δ = = (0.01-0.10)h. Air directed to cavity by part δ of impeller blades flows to disk under pressure, thus excluding separation of flow from disk. EFFECT: enhanced efficiency of fan. 6 cl, 6 dwg