RU53590U1 - DYNAMIC CLASSIFIER - Google Patents

Abstract

The utility model relates to devices for separating bulk materials into small and large products and can be used in the power industry, electrode, cement and other industries.

The dynamic classifier includes an outer casing with a cover and nozzles for supplying the initial and removal of large and small materials, an inner casing with a branch pipe for discharging large material, a rotor with radial blades, located between the cover of the outer casing and the inner casing, guide vanes located above the upper edge of the inner casing, characterized in that the guide vanes in height are made of two parts, each of which is equipped with a rotation drive.

The utility model improves the efficiency of the classifier.

Description

The utility model relates to devices for separating bulk materials into small and large products and can be used in the power industry, electrode, cement and other industries.

Known dynamic classifier containing an outer casing with a cover, nozzles for supplying the source and discharge of a large product, a rotor with radial blades, a pipe for withdrawing the finished product / 1 /.

The design drawback is the low classification efficiency due to the unorganized input of the feed stream into the rotor blades.

The closest in technical essence and the achieved effect to the declared one is a dynamic classifier containing an outer casing with a cover and nozzles for supplying the source and removal of large and small materials, an inner case with a branch pipe for removing large material, a rotor with radial blades, located between the outer and inner cover housing, guide vanes located above the upper edge of the inner housing.

In the classifier, an increase in the classification efficiency is achieved due to the preliminary swirling of the flow before it enters the rotor and matching of the angle of entry of the flow with the rotor speed.

The design drawback is the reduced classification efficiency, due to the unevenness of the velocity field along the height of the flow at the exit of the guide vanes (Fig. 1a), which leads to inconstancy of the boundary size of the separation along the height of the separation zone.

This goal is achieved by the fact that in a dynamic classifier containing an outer casing with a cover and nozzles for supplying the source and removal of large and small materials, an inner housing with a branch pipe for removing large material, a rotor with radial blades, located between the cover of the outer case and the inner case, guide vanes located above the upper edge of the inner case, the guide vanes are made of two parts in height, each of which is equipped with a rotation drive.

A distinctive feature, namely, the implementation of the guide vanes in height of two parts, each of which is equipped with a rotation drive, leads to the appearance of a new property - equalization of the velocity field by the height of the flow at the exit of the guide vanes due to the installation of the lower and upper parts of the vanes

from different angles, which leads to the alignment of the velocity field (Fig.1B.) and, therefore, the boundary size of the separation zone and ensures the achievement of the goal - increasing the classification efficiency.

Figure 1 presents the plot of the flow rates in the prototype (a) and the proposed design (b); figure 2 schematically shows a dynamic classifier.

The dynamic classifier includes an outer casing 1 with a cover 2, a supply pipe for the source 3 and a large 4 and small 5 materials outlet, an inner case 6 with a large material outlet pipe 7, a rotor with radial blades 8, located between the cover of the outer case 2 and the inner case 6, guide vanes 9, made in height of two parts and placed above the upper edge of the inner housing 6, each part of the blade 9 is equipped with a rotary drive 10.

The classifier works as follows.

The source material is fed by a gas stream through the pipe for supplying the source material 3 to the annular channel between the outer 1 and inner 6 bodies.

A sharp decrease in the flow rate at the outlet of the nozzle 3 leads to the precipitation of large particles and their output through the nozzle of the removal of large material 4. The rest of the material passes through the guide vanes 9, where the flow is twisted in accordance with the speed of rotation of the rotor 8. The installation angle of the upper and lower parts the guide vanes 9 are controlled by the drives 10. The swirling flow of material and gas enters the rotor 8 with radial blades. Small particles under the influence of the prevailing aerodynamic forces of the flow are carried out through the branch pipe of the removal of small material 5, large particles under the influence of the prevailing centrifugal forces are discarded to the periphery of the separation zone, slide along the wall of the inner casing 6 and are discharged through the pipe 7.

The installation of the upper part of the guide vanes at an angle to the radius of the classifier large angle of installation of the lower part allows you to align the field of flow rates, and, therefore, align the boundary dimensions of the separation of the height of the zone, thereby increasing the efficiency of separation.

Sources of information taken into account when preparing the application:

1. A.S. USSR, No. 498972, class 07 V 7/083, BI No. 2, 197 p.

2. France patent, No. 8901888, cl. B 07 B 7/083, 02/14/1989.

Claims (1)

A dynamic classifier comprising an outer casing with a lid and nozzles for supplying the initial and removal of large and small materials, an inner casing with a nozzle for discharging large material, a rotor with radial blades, located between the cover of the outer casing and the inner casing, guide vanes located above the upper edge of the inner casing characterized in that the guide vanes in height are made of two parts, each of which is equipped with a rotation drive.