SU1002051A1 - Air classifier - Google Patents

Description

The invention relates to chemical complexity as well as to adjacent areas and can be used for dust removal and separation into fractions of polydisperse materials.

An air classifier is known, which includes a ventilation system, in the upper part of which two loading chambers are installed, into which the sorted material is fed, a receiving chamber in communication with both lodges by narrow chambers, rotating drums located obliquely l.

Compressed air is supplied to these drums, which is transported through the drums and the feed chambers.

During rotation, the dispersed material is separated into heavy and light fractions.

The disadvantage is the complexity of the device and the separation efficiency. The apparatus is very metal consuming and requires a very complex and cumbersome device to impart rotational movement to the separation drums.

In separating drums, there is no intensive interaction of particles of the material being separated with air; therefore, in the final shallow

the product will inevitably contain large particles, and in the final large product - a dusty fraction. .

The closest in technical essence and the achieved result to the proposed is the air classifier, which includes a camera

10 classifications with contact elements, air inlet, loading and unloading nozzles of coarse and dust fractions 2,

The disadvantage is the poor quality of the classification.

15

The purpose of the invention is to improve the quality of classification.

The goal is achieved by the fact that the air classifier, which includes a classification chamber with

Claims (2)

20 contact elements, an air inlet pipe, loading and unloading pipes for large and dust fractions, are equipped with successively installed on the side opposite to the air inlet pipe and connected to each other and with the classification chamber by settling chambers of the middle and small fractions with paral30 installed on their side walls each other by inclined plates, while the discharging patrus of the pulverulent fraction is connected to the precipitation chamber of the fine fraction, and the cross section is fine fraction chamber exceeds the cross sections are Poper classification chamber. The air inlet is fitted with adjustable louvers. And the discharge pipe of the dust fraction is equipped with a valve. The drawing shows the air 1cssifikator. Air classifier contains; amer of classification 1, loading (bunker 2, reflective 3, separating 4 perforated elements, as well as pivoting louvers 5, pipe 6 for unloading coarse fraction, settling chambers of middle fraction 7 and fines 8 with inclined plate w 9, pipe 10 for unloading middle fraction, pipe 11 for discharging the fines fraction. The discharge pipe of the dust-like fraction 12 is connected to the fines precipitation chamber and has a flap 13 that allows adjusting the speed of the vertical air flow. The raw material from the feed hopper 2 enters the classification chamber and, by an upward flow, the air breaks up into separate particles that fall onto the separating element 4. Here the material comes to a suspended state and small particles are released from it up and along the discharge port 12 are sent to the dust collectors. Large particles, which can be enlarged with fine particles up, are retained by the upper reflecting element 3 and returned to the classification cycle. Further, the material flows to the downstream reflecting element 3, and from it flows to the separating element 4, and the classification cycle is repeated. After several cycles, the material is almost completely separated from the dust fraction. Swivel shutters 5 allow you to adjust the speed and direction of air flow and form a horizontal air flow with the same velocity profile. The air velocity by opening or closing the louver1 is chosen greater than the speed of separating the velocity of particles separated in the zone of the same profiles, the precipitation velocity of the particles separated in the zone of the same velocity profiles and less than the minimum velocity of fall of the particles passing through this area. Therefore, from the nozzle b unload only the largest particles without admixture of small. In the precipitation chamber 7 of the classifier, the dust-gas flow hits 0 inclined plates 9 and changes its direction sharply, therefore, as a result of centrifugal and inertial forces from the flow, the average fraction of the material being classified is discharged, which is discharged from the apparatus through the nozzle 10. the chamber 10, again strikes the inclined plates 9 and again abruptly changes its direction. As a result, a fine fraction is discharged from the material flow, which is discharged from ata through the pipe 11. Due to the fact .chto settling chamber diameter 8 greater than the diameter. Classification chambers 1, the flow rate in it drops sharply, which eliminates the entrainment of particles of the small fraction into the dust collectors and facilitates their precipitation. The precipitated particles are discharged through the pipe 11. The use of the proposed separator will improve the quality of the classification. 1. An air classifier, including a classification chamber with contact elements, an air supply nozzle, charging and unloading nozzles of coarse and dust-like fractions, characterized in that, in order to improve the quality of the classification, the classifier is equipped with consecutively installed on the side opposite the air supply nozzle, and precipitating chambers of medium and small fractions connected with each other and -classification chamber with parallel mounted on their side walls at the inclined plates, at the same time the discharge pipe of the dust-like fraction is connected with the precipitation chamber of the small fraction, and the cross-section. precipitation chamber of the fines fraction exceeds the cross section of the classification chamber, 2. The classifier according to claim 1, which is characterized by the fact that the air inlet pipe is equipped with adjustable louvers. 3. Classifier according to claim 1, characterized in that the discharge nozzle of the pulverized fraction is provided with a valve. Sources of information taken in-attention during examination 1. US Patent 4,21052. Cl. 209-152 published. 1980., 2. USSR author's certificate 713618, cl. In 07 In 4/08, 1978 (prototype) .. ffcjfofff d / y