SU1547867A1 - Centrifugal classifier - Google Patents

Abstract

The invention relates to devices for the separation of polydisperse bulk materials into fractions. The aim of the invention is to improve the efficiency of classification due to the cleaning of the light fraction. The classifier includes a cylindrical-conical body 1 with a lid 2, a discharge pipe 3 of a fine fraction, a bottom 4 and an estrus 5 of a coarse product. Inside the case there is a cylinder-conical shell 6 with a loading nozzle 7, a conical distributor (CU) 8 and a twisting device in the form of blades 9 located in the gap between the casing 6 and CU 8. Between the screwing device and the lid 2, an additional CU 10 is installed with gaps, facing top down. The casing 1 contains an annular shell 11 of trapezoidal cross section adjacent to the wall of the casing 1 and an additional RC 10 enclosing the radial clearance, and a blade unit 13 installed in the upper part of this gap. The annular slit 12 is formed with an inclination to the axis of the classifier in the annular shell 11. The source material with air is fed through the pipe 7, twists on the blades 9 and enters the lower classification zone between the blades 9 and RC 10. Coarse fractions are removed through estrus 5, small ones are twisted by the blade apparatus 13 and enter the upper classification zone between the cap 2 and RC 10, where they are reclassified. 1 il.

Description

The invention relates to devices for the separation of polydisperse bulk materials into fractions, namely centrifugal classifiers, and can be used in the building materials industry, chemical technology, energy, and other industries.

The purpose of the invention is to improve the efficiency of classification due to the cleaning of the light fraction.

The drawing schematically shows a centrifugal classifier, a longitudinal section.

The classifier consists of a cylindrical conical body 1, with a cover 2 and with a discharge pipe 3 and a bottom k with a chute 5 of a coarse product. Inside the housing there is a cylindrical shell 6 coaxially located in it, in which a loading nozzle is attached at the bottom. 7, passing through the bottom 4. A cylindrical conical distributor 8 is installed coaxially to a cylindrical cone 6 In the radial gap between the cylindrical parts of the shell 6 and the distributor 8 an axial twisting device is installed, represented by axial vanes 9. In the axial gap between the twisting device 9 and the lid The housing 2 with a gap relative to them along the axis of the classifier has an additional cone distributor 10, covered by a shell 11, having a through annular slot 12, starting at the top the second part at the periphery of the sleeve 11 and having a slant to the axis of the classifier. In radial

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the gap between the additional conical distributor 10 and the shell 11 of the upper part is installed blade apparatus 13.

Centrifugal classifier works as follows.

The source material, together with air, is fed through the loading nozzle 7, moves in the radial gap between the cylindrical cone 6 and the cylindrical cone 8, twists in the twisting axial device 9 and enters the lower part of the centrifugal-countercurrent classification zone formed in the axial clearance between the axial clearing body and in the axial clearance of the axial classification unit formed in the centrifugal countercurrent classification zone formed in the axial clearance between the axial clamper and in the axial clearance. , an additional conical distributor 10 and an annular shell 11. Large particles under the action of the prevailing centrifugal forces are thrown to the periphery Oi, are deposited on the inner surface of the housing 1, poured into the annular gap between the housing and the cylindrical cone 6 on the bottom C and out through the heat of the coarse product 5. The small particles under the action of the prevailing forces of entrainment by the gas flow move to the axis and, together with the gas, are sucked through the radial gap between the additional conical distributor 10 and the shell 11.

Moving up the gap, the stream with small particles is again diverted to the periphery of the body, swirled with a blade device 13 and enters the upper part of the centrifugal-countercurrent separation zone formed in the axial gap between the additional conical distributor 10 and the lid of the body 2, where there are small particles subjected to centrifugal re-classification. The coarse particles that were isolated, which erroneously fell into small products in the lower part of the centrifugal countercurrent separation zone, are deposited on the inner surface of the housing 1 and poured through the through annular slot 12 into the lower part of the centrifugal countercurrent zone, where they are classified again. The fine particles together with the gas are sucked off through the discharge port 3.

Thus, in the centrifugal classifier, an increased efficiency of separation of the source material into large and small fractions is achieved by re-classification of the fine product.

Claims (1)

Invention Formula Centrifugal classifier, comprising a cylindrical shell with 0 five with a lid and with pipes for supplying the starting material and withdrawing a thin product, the bottom, located in the lower part of the body, is an estrus of a large product, installed with a radial clearance in relation to the body and consisting of outer and inner shells and blades placed between them, and a conical distributor, characterized in that, in order to increase the classification efficiency due to the refinement of the light fraction, it is equipped with an additional conical distributor with its top facing down and installed with between the housing cover and the screwdriver, an annular trapezoidal cross-section shell, adjacent to the housing wall and an additional conical distributor with radial clearance, and a blade device installed in the upper part of this gap, with an annular slot with an inclination to the axis of the classifier in the upper part of this gap.