GB795494A - Improvements relating to a classifier for classifying materials of different size and/or density - Google Patents

Abstract

795,494. Centrifugal separators. SHARP LES CORPORATION. May 4, 1956 [May 9, 1955], No. 13816/56. Class 23 Apparatus for classifying solid particles by the opposing actions of centrifugal force and an inward fluid current comprises a classifying zone having axially spaced rotatable walls converging from the outer boundary to the inner boundary of the zone, a particle inlet into the zone moving with the walls and located between the inner and outer boundary, and means creating the fluid current between the walls. The zone 16 lies between the walls 34a, 35a of the rotor which comprises parts 14, 30, 34, 35, 36, 37, 68. The particle mixture passes through a rotary valve (not shown), is mixed with a controlled amount of air, and passes through a pipe 13 to discharge on to the rotor part 14. The particles are thrown outwardly by vanes 15, travel through radial passages 41 in the rotor, and are discharged through an annular outlet 17 into the zone. Air passing through adjustable whirl vanes 48, 49 enters the zone tangentially to rotate at the speed of the walls at the outlet 17. Air and fine particles pass from the zone in to a stationary scroll 45 and are led to a bag filter which is connected to a fan causing the current through the apparatus. The coarse particles pass between vanes 50, slide circumferentially along the wall 38 and are discharged tangentially into a pipe 53 to pass through a rotary valve for collection. In modifications the upper inlet vanes 48 are dispensed with, or the vanes 48, 49 are replaced by four spiral vanes having vertical cross-sections. As shown in Figs. 13, 14 the rotor 34, 175; 178 is mounted in bearings 176, 177, and the particle feed pipe 151 is stationary within the rotor. The rotor is driven by a variable speed drive 165, belt 168, worm and wheel 171, 172, a shaft 173 driven by the wheel, and a pin 174 on the shaft which engages a notch in the lower part of the rotor. The rotor, plate 206, feed pipe 151, whirl vanes 125 and their adjusting mechanism, and cover 209 are hinged at 203 to the base of the apparatus, a spring 204 being provided to counter-balance their weight Air is fed into the apparatus through a scroll 162 and passes between the vanes into the zone 16. Coarse particles impact against the vanes to fall into a collector 160 to pass to a container 160a. Fine particles pass from the zone to a scroll 211 and are continuously discharged through a pipe 212. As shown in Fig. 12 a hopper 150 and conveyer 150a is used to supply the particle mixture to the rotor, a controlled quantity of air being admitted through a valve 44. Vanes 121 mounted on the rotor give the air entering the zone 16 its tangential velocity. Coarse particles discharged from the zone pass between plates 123 and fall into a scroll 119. Dimensions of the apparatus are given in the Specification. Specification 675,365 is referred to.