CLASSIFIER FOR SEPARATION OF POWDERY MATERIALS INTO FINE AND COARSE PRODUCTS Russian patent published in 1994 - IPC

FIELD: powdery materials separation devices. SUBSTANCE: classifier has outer cone-shaped body 1 with upper cover 3, inner body 2, chutes for withdrawal of coarse product 4 and 5, axial branch pipes for feeding of initial material 6 and withdrawal of fine product 7 twisting rotatable blades 9 fastened on vertical axles 10, zone of separation 8. Branch pipes 7 of withdrawal of fine product have perforation in the form of vertical slits 12 expanding from top to bottom. Slits 12 are covered on revolving inflowing side by deflectors. Initial material through branch pipe 6 is fed between bodies 1 and 2. From it the biggest particles drop down and are withdrawn through chute 4. The remaining product twisting in blades 9 is fed into separation zone 8. A portion of gas and fine particles is fed through slit 12 and branch pipe 7, the remaining gas turns its movement downward to the inside of body 2 where coarse particles drop down from it. EFFECT: enhanced operating reliability. 3 cl, 4 dwg