CENTRIFUGAL FAN Russian patent published in 1994 - IPC

FIELD: fans. SUBSTANCE: impeller with blades and air ducts are positioned in a fan case, the blades are mounted between lifting and covering disks and communicate with air feed branch pipes. The air ducts with longitudinal toroidal-shaped slots are fixed to the case and are mounted coaxially to the lifting and covering disks and in a spaced relation to the covering disk. The branch pipes are tangent to the middle line of the air ducts two at a time for each pipeline. EFFECT: improved structure. 2 dwg