AXIAL-FLOW FAN Russian patent published in 1994 - IPC

FIELD: fan making. SUBSTANCE: axial-flow fan has body with intake and pressure spaces and impeller with blades provided with centrifugal ducts installed in it. Inlet holes of centrifugal ducts are hydraulically connected to intake space and outlet holes - to pressure space. Body is provided with rotary and ring ducts inter communicating in sequence. The latter of ducts is located concentrically on body. Body includes ring slit made in zone of outlet holes of centrifugal ducts of blades and ejector. Active nozzle of ejector communicates with centrifugal ducts of blades with the aid of slit, passive nozzle communicates with atmosphere. Rotary duct is used as mixing chamber. Profiled windows are made in walls of rotary and ring ducts. EFFECT: expanded operational capabilities of fan. 2 cl, 3 dwg