SU136687A1 - Air Classifier for Powdered Materials - Google Patents

Description

Г - h - R - k - - -fbHf- particles - h г 14.66QLlf f b у p.p. radius in the separation zone (distance in the zone from the geometrical axis of the classifier) - cm, zone height at radius g - cm, circle radius along the inner edges of the rotor blades in the zone - cm, particle shape factor, kinematic viscosity of the working gas - cm 1s, specific gravities of the working gas and material classified by ZJCMS, d V 1 /

No. 136687-2 -

Q - flow rate of the working gas - s / jou / sec, p - rotor revolutions - about / lshk,

dv-required separation limit (approximately equal to half the size of the largest particle) —cm.

The material particles are fed to the main separation zone already rotating with air, thereby reducing the effect of the material on the air flow pattern in the main separation zone. In contrast to the existing separators, the rotation of the particles is set not by discharge from the disk, but by preliminary spinning with air of the blades.

The primary separation zone is centrifugal countercurrent.

The drawing shows a diagram of the separator. The air flow with the material being classified but the pipe / is mounted in the space 2 with the rotating rotor 3. The narrow plates 4 are fixed along the forming conical casing of the rotor by means of which the rotation of the rotor is transmitted to the air. The air vortex is especially intense in the base of the upper separation zone 5, as air enters here, completely passing between the ends of the plates 4 protruding above the rotor cover 6.

In the lower part of the plate, the rotor hits the particles, throwing the largest of them against the wall of the count: ear. The dusty flow, twisting, rises upward in the space between the casing 7 and the rotor n falls into the main separation zone, the zone of the most intense vortex.

The material particles are fed to the main separation zone already pre-rotating with air. In the main zone of the particle, two oppositely directed forces act, determining the movement of the particle into thin or coarse separation products. One is the drag force, which entrains particles with air from the periphery to the axis and the nozzle 8 of the air flow with the thin product and the other — oppositely directed — the force is centrifugal, resulting from the rotation of the particles with air, and moving the particles towards the periphery, to the casing 7 For large particles, the second force prevails, shifting to the wall of the casing, sliding down it, and then discharging through the chute 9 into a coarse product. For small particles, the first force prevails. Small particles are carried with the air through the nozzle 8 and the cochlea 10. The particles removed from the air are a fine classification product. The boundary of separation is determined by the equality of these two forces. The main separation zone is specially shaped by the introduction of a kripka, i.e. theoretically and experimentally selected, the dependence of the zone height on the radius (distance from the axis of the separator) is necessary. The zone profile is determined from the condition of a constant separation boundary along the zone radius.

The constancy of the separation boundary from one place to another with a large area in the direction of the radius made it possible to neglect the probability of large particles falling into a thin product.

Subject invention

The air classifier of centrifugal powdered materials, consisting of a body with tangential injection of split powder together with air vozduhayuschim it and placed in it a rotor with chambers, profiled by calculation to ensure the separation boundary in the whole space of these chambers, characterized by what is to be done

separation of powders with a conventional grain size; rotor separation chambers 13 have a profile in the radial direction, determined for given specific conditions, by the resistance coefficient of the grains of the powder material as they move in air.

№ 136687