SU1204275A1 - Apparatus for classifying pulverulent materials - Google Patents

Description

one

The invention relates to devices for the separation of bulk materials by means of air flow and centrifugal force, and can be used in the industry related to the processing of powder-like materials.

The purpose of the invention is to increase the efficiency of classification by cleaning the coarse fraction.

The drawing schematically shows a device for classifying powdered materials.

A device for classifying powdered materials includes a housing 1 of a separation unit, in the lower part of which a sector feeder 2 is installed, connected to a branch pipe 3 of the coarse fraction and zigzag channels 4, which are fastened together with internal edges that form rhombic chambers 5 and 6 The lower part of the upper rhombic chamber 5 is in communication with the slit openings 7 with the cavities of the zigzag channels, and the lower meter 6 with the perforated lower edges 8 is connected to the connections 9 and 10 with the adjustable valve 11 and The main discharge air duct 12 with a flap 13.

In the housing 1 of the separation unit, a rotor 14c is installed with a profiled separation zone 15, the upper disk limiting the separation zone being profiled in such a way that the flow rate of the gas flow remains constant along the radius of the separation zone. The rotor is rotated by the electric drive 16. A cyclone 18 connected by the circulating nozzle 19 of the fan 20 is connected to the outlet nozzle 17. The main pressure air duct in section 21 is connected to an additional pressure air duct 22 with an adjustable spacing 23, which in turn is connected to the housing 1 of the separation unit .

A loading device 24 is connected to the nozzle 10. The hth part of the zigzag channels 4 is connected by the nozzle 25 to the main discharge duct 12, and the lower part is connected to the large fraction hopper 26.

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A device for classifying powdered materials works as follows.

Using the actuator 16, set the required number of rotor revolutions 14 for a given boundary particle size. The fan 20 is turned on, and with the help of the dampers 11, 13 and 23, the flows га 10 are redistributed according to the calculations. The initial powder through the charging device 24 is fed into the carrier air flow Pipe 10 and post. . It goes to separation zone 15. Due to

15, the centrifugal force and the aerodynamic drag force of the particles are divided into two fractions relative to the boundary size. Large particles with a part of a small product by the action of centrifugal force are thrown against the walls of the casing 1 of the separation unit. Under the action of air streams supplied to the separation unit through an additional duct 22, randomly received fine particles return to the separation zone, i.e. partial purification of the coarse fraction occurs. Next, a large fraction

30 with the remaining part of the fine product through the sector feeder 2 and the nozzle 3 enters the rhombic chamber 5 and through the slit holes .7 the zigzag 25 of the channels 4 is fed into the cavities towards the additional gas flow coming from the perforated lower faces 8 of the lower rhombic chamber 6 connected to the nozzle 9. Particles

While passing through the cavities of the zigzag channels 4, the d0 undergoes additional purification, which minimizes the ingress of small particles into the coarse fraction. Large ready

.- fraction from the bottom of the zigzag channels enters the coarse fraction receiving hopper 26.

The small fraction under the action of aerodynamic drag force is carried out from the separation zone through the tangential nozzle 17 and enters the cycle 18. The profiling, the separation zone 15 prevents particles larger than the limited size from falling into the small product.

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Compiled by Yu.Pravtorov Editor L.KastranTekhred d.Babinets

Order 8457/7

Circulation 580 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Proofreader M.Maksimishinets

Claims (2)

1. DEVICE FOR CLASSIFICATION OF POWDERED MATERIALS, including a separation unit with a rotating rotor and an outlet nozzle of a large fraction, a cyclone, a fan, and the main additional pressure head. ducts, the circulating air duct, the collection of the coarse fraction, adjustable flaps, a charging device starting material distinguishing by the fact that, in order to increase classification efficiency by recleaning coarse fraction, the device is provided with a vertical zigzag the separation channels established between the outlet nozzle largest _of fractions and receiver coarse fraction, © connected by the upper and lower parts with the main pressure head duct. 2. The device according to π. 1, characterized in that between j output branch pipe of a large fraction> and zigzag channels installed sector feeder.