SU1359386A1 - Apparatus for classifying solid particles in slurry - Google Patents

Abstract

The invention relates to devices for cleaning paper from non-fibrous inclusions and its sorting, and can be used in pulp and paper industry in the production of thin technical papers. The purpose of the invention is to increase efficiency by achieving a high degree of separation hour / 4 / ff with S (L / J d 00 cd c c c o5 ig /

Description

tits. The device comprises a cylindrical body 1 mounted on a bottom bottom 2, which is fixed to support 3 and provided with a flange A for fastening the body 1 and support 3 with the sidewall, the outlet nozzle 5 for outputting the last fraction of sorted paper pulp, stuffing box and bearing unit 6 Inside the body 1, plates 7 are mounted for separating the pulp into fractions. The number of plates corresponds to the number of required mass fractions. Each plate 7 forms, with the shell of the casing 1, a volume for taking the mass fractions and bringing them out through pipes 8, 9, 10. The ends of the shell of the housing 1 is provided with a flange 11 for fastening to the lower bottom 2 and a flange 12 for fastening to the upper bottom 13

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The invention relates to devices for cleaning paper pulp from non-fibrous inclusions and its sorting and can be used in the pulp and paper industry in the production of thin technical papers.

The purpose of the invention is to increase the sorting efficiency by achieving a high degree of separation of particles.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 and FIG. 3 - the same, embodiments of the sorting element.

The device comprises a cylindrical body 1 mounted on the bottom bottom 2, which is fixed to the support 3 and provided with a flange 4 for fastening with the shell of the body 1 and the support 3, the outlet nozzle 5 for outputting the last fraction of paper sorting, packing gland and bearings. Plates 7 are mounted inside the body 1 for separating paper pulp into fractions. The number of plates corresponds to the number of required fractions of the grinding mass. Each plate 7 forms with the shell of the casing 1 a volume for collecting mass fractions and having a pipe 14 for venting and a fixed rotation body 15 is installed, equipped with an inlet device 16 with an inlet pipe 17. The fixed rotation body 15 has a cavity, which is connected in the lower part with the cavity of the housing 1, and at the top with the cavity of the intake device 16. Inside the shell of the housing 1 there is a rotation body 18 (rotor) entering the cavity of the stationary rotation body 15 (stator). An annular gap 19 is formed between the inner surface of the stat-ora and the outer surface of the rotor. In the lower part, the annular gap 19 communicates with the inner cavity of the housing 1 through an annular gap 20. The rotor is rotated from. drive shaft 21. 3 c.p. f-ly, 3 silt

water them through the pipes 8-10 in the shell of the housing 1. The ends of the shell of the housing 1 are equipped with a flange 11 for fastening to the bottom 2 and a flange 12 for fastening to the upper bottom 13.

On the top bottom 13 there is a nozzle 14 for venting and a fixed rotation body 15 is installed, equipped with an inlet device 16 with an inlet nozzle 17. Structurally, the inlet device 16 can be made in the form of a cyclone with a tangential nozzle 17 (Fig. 1 and

Fig.2).

The stationary body 15 of rotation has a cavity, which in the lower part communicates with the cavity of the housing 1, and in the upper part with the cavity of the inlet device 16. Inside the shell of the housing 1 there is a rotation body 18, which is the rotor of the sorting element, its upper part entering the cavity of the stationary rotation bodies 15,

being the stator of the sorting element. The diameter of the top. part of the rotor increases in the direction from the inlet device 16. Between the inner surface of the stator

15 and the outer surface of the rotor 18 is formed by an annular gap 19, in

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the upper part communicates with the cavity of the device 16. In the lower part, the annular gap 19 communicates with the internal cavity of the housing 1 through an annular slot 20 formed by the lower end part of the stator and the front surface of the rotor. The rotor is rotated from the drive shaft 21. The lower end of the rotor may have an annular gap 22 (FIG. 3) for taking a fraction containing heavy non-fibrous inclusions and bringing it through the nozzle 23. The bottom fraction of the 15 suspension containing heavy The switching part of the rotor has the shape of a disk, the front surface of which is smoothly mated with the surface of the upper part of the rotor entering the stator cavity. The fractionation part of the rotor can be made stepped (Fig. 1 and Fig. 2) with alternating horizontal face and cylindrical (Fig, 2) or tapered with a taper angle equal to 20-90 (Fig. 1 and 3 side surfaces).

The number of steps should correspond to the required number of fractions.

Tsil) (1drichesky case 1, separation plates 7, the inlet device 16, the stator 15 and the rotor 18 are mounted coaxially.

The device works as follows.

Paper mass through the tangential nozzle 17 is fed into the inlet device 16, acquires a rotational motion and enters the upper part of the annular gap 19 between the rotor 18 and the stator 15 of the sorting element. The direction of rotation of the rotor 18 must coincide with the direction of the initial rotation of the mass in the intake device. In the annular gap 19, the rotational movement of the mass develops due to the friction of the inner layers of the suspension on the surface of the rotating rotor 18. Under the action of the centrifugal forces that arise during the rotation of the mass, heavy non-fibrous inclusions, having a greater density than the fiber, are located along the inner surface of the stator and along its walls spiraling in the direction of the annular slit 20. When the paper pulp leaves the annular slit, the heavy non-fibrous inclusions will be

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on the surface of the slurry layer moving along the open front surface of the lower fractionation part of the rotor 18. At the same time, the energy required to overcome the resistance of the medium and the surface tension of the liquid will be minimal, and the heavy particles due to the kinetic energy acquired during the movement are separated from the surface of the suspension on the edge of the front surface of the fractionation part of the rotor 18 (Fig. 1 and 2). Layer

It can be separated in another way, for example through an annular gap 22 in the lower part of the stator 15 (Fig. 3).

The subsequent separation of the paper pulp into the required number of fractions occurs on the lower fractionation part of the rotor 18 when the paper pulp layer moves along horizontal face surfaces under conditions of a high shear gradient. The largest fibers and fiber bundles are concentrated on the surface of the slurry layer and separated by centrifugal forces on the edges of the respective faces. In this case, with an increase in the radius of rotation of the rotor, the centrifugal force increases and more and more smaller particles separate from the surface of the slurry layer. The resulting paper pulp fractions are collected on separation plates 7 and discharged through the corresponding nozzles.

The proposed device (unlike the known ones) allows the separation of particles both in size and in their specific gravity.

Claims (4)

1. A device for sorting solid particles of a suspension, comprising a screening element with an actuator housed in a housing equipped with a nozzle for feeding a suspension stream to the screening and nozzles for discharging the cleaned mass and waste of screening, in order to increase the screening efficiency by achieving the high degree of separation of particles, the sorting element is made in the form of two bodies of rotation, placed one in the other, with an annular gap, the inner one being connected with the drive, the body of rotation and its diameter increasing in the direction of movement of the suspension. 2. The device according to claim 1, wherein the sorting element is made in the form of two cones, facing tops towards the flow of the suspension. 16/4 9386 3. The device according to claim 1, about tl and - the fact that the sorting element is made in the form of two hemispheres. 4. The device according to claim 1, wherein the external body of rotation of the sorting element has the shape of a cone, and the internal one has the shape of a parabola. ten 17 Editor A.Revin .The compiler N.Kosharuk Tehred L. Serdyukova. Proofreader I. Muska Order 6121/30 Circulation 341 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Rautska nab. 4/5 Production and printing company, Uzhgorod, st. Project, 4