SU1618435A1 - Rotary pulsation powder dispenser - Google Patents

Abstract

The invention relates to equipment for the production of fine-dispersed systems by the year 4 of hydroacoustic effects. The purpose of the invention is to increase the degree of dispersion. The disperser includes a housing 1 with a working chamber 2, a nozzle 3 for inlet and a nozzle 4 for withdrawing the processed medium, a cylindrical stator 5 and a rotor 6. In the inner cavity 10 of the rotor 6, there are installed baffles 11 made with filter holes 12 and radial discharge channels 13 The injection channels 13 and the holes 12 in which the medium passes through the device ensure the discharge of the separated part of the medium and its pressure under pressure to the next processing stage. 3 il .. 1 ate with CHE 00 4. OJ ate

Description

The invention relates to chemical engineering, in particular, to equipment for the production of finely dispersed systems by the method of hydroacoustic effect, crush and abrasion.

The purpose of the invention is to increase the degree of dispersion.

FIG. 1 shows a rotary pulsation disperser, longitudinal section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows the flow pattern of the working medium in the rotor-pulsation disperser.

The rotor pulsation disperser consists of a collapsible body 1 equipped with a working chamber 2, a nozzle 3 for inlet and a nozzle 4 for withdrawing the processed medium coaxially mounted in the case 1 of a cylindrical stator perforated along the perimeter of the cylindrical stator 5 and the assembled rotor 6 consisting of an impeller 7 and rings 8 and 9, forming an internal cavity 10. The internal cavity 10 can be made by rotating semicircles around the axis of the rotor 6. The impeller 7 and the rings 8 and 9 are interconnected in a known manner, for example, on screws. In the internal cavity 10, partition walls 11 are mounted, provided with filter holes 12 on both sides and radial pressure channels 13 arranged inside partition walls 11. Partition walls 11 are mounted opposite slots 14 made around the perimeter of the ring 9 and in the slots 15 of the ring 8 to allow the output of the working medium through the expanding slots 16 of the stator 5 into the working chamber 2 and then through the pipe 4 to the outside of the apparatus. In the impeller 7 there are radial wide grooves 17, the walls of which play the role of injection elements, an annular collector groove 18 and a plurality of 100-500 pcs. narrow injection grooves 19. The width of the grooves 19 should be less than the diameter of the grinding bodies to prevent them from pouring out from the inner cavity 10 of the rotor 6. Recommended width of the injection grooves 19 is 1-3 mm. Filtered holes 12 are also recommended to be made with a diameter of 1-3 mm and be placed in the central part of the dividing walls 11.

Rotary pulsation Dmspergator works as follows.

The processed medium, for example, suspension, through the nozzle 3 enters the wide grooves 17 of the impeller 7, accelerates into them, enters the annular collector groove 18, which is distributed along the narrow discharge grooves 19.

The working medium is again accelerated and tangentially ejected in the form of a flooded cavitating jets ao the internal cavity 10 of the rotor 6. Convex has concave walls

rings 8 and 9 of the rotor 6, the medium being processed entrains grinding bodies as they move, for example bead glass balls placed in the internal cavity 10 and twisting with them into a toroid-shaped vortex,

The central part of the treated medium is removed from the inner cavity 10 through the filter openings 12 through the channels 13 and the slits 14 and 16 when they coincide into the working chamber 2 and further into the discharge nozzle 4. The other peripheral portion of the treated fluid rotates in the inner cavity 10 together with grinding bodies, forming a torus-shaped vortex proper. The required rotating pulse is received by a toroidal vortex from a tangentially affecting flow. In a toroidal vortex, a pressure gradient is created: a maximum at the periphery and a minimum at the center of the swirling flow. The pressure gradient performs two functions: first, it is superimposed on the discharge pressure, which increases the overall pressure drop acting in the internal

0 cavity 10 and the working bodies of the rotor-stator and, secondly, closes the flow at the outlet of the narrow slits of the impeller 7, i.e. creates a hydraulic shock in narrow pgs x 19 and annular manifold groove 18.

5 The back pressure wave of a hydraulic shock knocks out foreign bodies, accidentally appearing in the treated suspension and stuck at the entrance to the narrow grooves of the 19th century. Ring collector groove 18,

0 thereby increasing the efficiency of the device. At the same time, a hydraulic shock locks the entrance of the slurry stream into the internal cavity 10, creating conditions for its partial release, a new step 5. replenishment and periodical formation in the central part of the liquid boiling zone due to the dilution created by the rotation of the flow in the internal cavity 10, and the vacuum effect created by the oppressive channels 13 in the internal cavity 10.

Since the blocking flow is in dynamics: rotate; -, around the axis of the internal cavity 10 and together with the rotor 6

5 around its axis, and at the same time sucked through the centrally located filter holes 12, then conditions are created in the internal cavity 10 to fill it, rotate the flow and lock it, etc.

At the same time, the grinding bodies and large particles of the suspension constantly rotate around the periphery of the internal cavity 10, rubbing together the walls of the rings 8 and 9, and the walls of the narrow grooves 19 and the separation gaps 11. At the same time, the grinding bodies will crush the large particles, ensuring good the general mode of dispersion (dispersion without destroying the structure of molecules). This reduces and even prevents the wear products of the grinding bodies and themselves through the filtering holes 12, the discharge channels 13 into the gap between the rotor and the stator, which ensures less wear of the working parts of the rotor-stator and their greater reliability.

In the central part of the internal cavity 10, an oval-shaped zone of a fine fraction containing gas and liquid and solid particles of the finished product is created. This fraction is constantly sucked through the filtering holes 12 into the injection channels 13 and under pressure is selected for re-dispersion and homogenization into the system of the working bodies of the rotor-stator. Due to the presence of finely dispersed gas bubbles in the fraction, the process of cavitation destruction in the working bodies of the stator rotor and its slots 16 is intensified. At the same time, finely dispersed gas bubbles turn into microbubbles, which causes their intensive collapse in the working chamber 2 and the destruction of the product particles by cumulative microspaces.

The technical and economic efficiency of the rotary pulsatory dispersed powder is substantiated by a number of technical and physical effects. Technical effects include: longer time of exposure to destructive factors on the processed medium; flow circulation, turbulence; filtration; pressure increase (when flowing around a concave surface); mechanical abrasion, crushing, cutting of particles.

The physical effects used in the invention as destructive factors include: cavitation; centrifugal forces (separation of particles and increased crushing forces); inertial forces (water hammer, pulsation),

These eight factors make it possible to estimate the destruction efficiency factor using the formula

Ef.r. -

Hef. + 2e.f. 2 Eph. t. + ЈEf.f. + 1

 0.88,

where ef.r. - destruction efficiency; Ef.t. - technical effects; Eph. - physical effects;

2 - the sign of the sum of effects.

Dispersing ability, i.e. subtlety of dispersion, homogeneity, productivity, reliability and non-contamination of production by foreign bodies to a large extent depends on the number of physical and technical methods used in the grinding process: the more of them, the better the degree of positive influence of physical and technical factors on each other and other factors (for example, the design capabilities of the device).

In the invention, all effects have a positive effect on each other. For example, the use of the high-speed flow property, which implies an increase in pressure in it during an abrupt change in the direction of flow or flow around a concave wall, allows both hydraulic shock and cavitation and pulsation fracture to be absorbed, which increases dispersing ability: rotor-pulse of the country’s apparatus according to its comparison with the known.

The rotary pulsation disperser can work both with grinding bodies, placed. ™ in the internal cavity 10 before the assembly of the rotor 6. or without n's.

Claims (1)

Formula invented and A rotor-pulsating dislergator, comprising a housing with supply and removal branch pipes of the treated medium, coaxially installed in the housing a stator perforated along the perimeter and a Tsotor with an internal cavity equipped with a dividing partition, so that , in order to increase the degree of dispersion, it is equipped with an add-gel. by dividing partitions. the baffles are made with internal radial injection channels and filter holes communicating with them. Aa