CENTRIFUGAL FAN Russian patent published in 1994 - IPC

FIELD: fan manufacture. SUBSTANCE: impeller is mounted in fan helical casing 1 with inlet and outlet branch pipes 2, 3. The impeller has blades 4 located between lifting and rotor disks 5, 6, a rotating grinding device made in the form of nut 7 with diametrically located rods 8 which is positioned coaxially with the impeller is positioned in inlet branch pipe 2. Plate 9 with projections 10 inclined towards the impeller rotation is fastened to the inner surface of casing 1. Cross rods 11 with a square cross section are fastened to disks 5, 6 and are located in the interblade channels. Moreover, brackets 12 which have sections extendable above the impeller and grinding rods 13 with plates 14 located inside are also fastened to the disks. Additional rods 15 with profile matching the profile of rods 8 are circumferentially staggered on casing 1 ahead of pressure branch pipes 3 between the plate and the impeller. Rods 8 are located in two cross sections, and the rods of one section are displaced relative to the rods of the second section. EFFECT: improved structure. 2 dwg