SU1632448A1 - Pneumatic classificator - Google Patents

Abstract

The invention relates to the separation of solid materials and m. used in chemical, electrode, mining and other industrial areas. The purpose of the invention is to increase the specific performance of the device. A vertical rod 2 is inserted into the housing 1. On the inner wall of the housing 1 and the rod 2, an additional 3 and 4 main discrete perforated contact spirals are fixed. Between the elements of the spirals 4 and 3, the gable contact elements 5 are fixed with a gap relative to the body of the rod 2. The nozzle 6 installed in the middle part of the body 1 serves to supply the material, the nozzle 7 installed in the lower part of the body 1 is used to supply air. Through the pipe 8, located in the lower part of the housing 1, a large product is removed from the apparatus, and through pipe 9, installed

Description

This invention relates to the separation of solid materials and can be used in the chemical, electrode, mining, and other industries.

The purpose of the invention is to increase the specific performance of the device.

FIG. 1 shows the pneumatic classifier, general view; in fig. 2 shows the layout of the gable contact elements.

The pneumatic classifier consists of a circular case 1, into which a vertical rod 2 is inserted. On the inner wall of the case 1 and the rod 2, an additional 3 is fixed and the main 4 discrete perforated contact spirals. Between the elements of the spirals 4 fixed on the inner wall of the housing 1, and the elements of the spirals 3 fixed on the internal rod 2, double-rolled perforated contact elements 5 are installed with a gap relative to the wall of the housing 1 and the rod 2. The pipe 6 serves for supplying the material, and the pipe 7 - for the supply of air. Through pipe 8, a large product is removed from the device, and through pipe 9, small product and air.

Pneumatic classifier works as follows.

The starting material is fed through the tube 6 into the space between the coils. A portion of the material is weighed by the air flow through the nozzle 7 and is involved in upward spiral motions. Another part of the material, slipping along the elements of the spirals 3 and 4 and the gable contact elements 5, is intensively blown by the air flow passing through the perforations and gaps between the contact elements. The weighted material is separated by gravity and centrifugal forces. A part of the material, which is involved in the spiral motion, is subjected to the pulsating effect of vertical air flows when it passes from one contact element to another, which contributes to the destruction of local zones of increased concentration of the material (bundles) and thereby intensifies the separation process.

The centrifugal forces are thrown against the wall of the casing and slide into the lower part of the classifier, from where they are discharged through the pipe 8. Fine particles with air flow are carried through the upper pipe 9.

The making of the spiral contact elements discrete with the installation of the gable contact elements between them leads to the fact that the vertical air flow is divided at the installation site of the gable element into two streams and diverted to the walls of the housing and the inner rod. Above the gable element a zone of reduced pressure is formed, the entry into which the bundle of material breaks down. At the same time, the material from the tow, slides along the surface of the contact element, moves to the walls of the housing and the internal rod, where it interacts with vertical air flows formed by the gable elements. Thereby, the separation process is intensified. Due to the redistribution of material flows in the apparatus, the local concentration of the material decreases (the bundle is destroyed), which allows to increase the specific productivity of the classifier without reducing the quality of separation,

Claims (1)

Pneumatic classifier comprising a body with a main contact helix, an inner rod and an additional contact helix fixed on the inner rod, air inlets and large material inlets located in the lower part of the case, a outlet for small products installed in the upper housing parts, and a pipe for material supply, located in the middle part of the housing, characterized in that, in order to increase the specific productivity, it is equipped with gable ontact elements, while the contact spirals are made discrete, the elements of the main contact spiral attached to the housing, and the gable contact the elements are fixed between the elements of the main and additional contact spirals and with a gap relative to the housing and the inner rod. Rig. 2 one