WO2012091687A1

WO2012091687A1 - Cascade eddy mill

Info

Publication number: WO2012091687A1
Application number: PCT/UA2011/000101
Authority: WO
Inventors: Олег Юрьевич ХАЛИП; Виктор Владимирович ШОСТАК
Original assignee: Khalip Oleg Yurievich; Shostak Victor Vladimirovich
Priority date: 2010-12-30
Filing date: 2011-10-21
Publication date: 2012-07-05
Also published as: UA100422C2

Abstract

The invention relates to the field of mechanical engineering. The cascade eddy mill comprises cylindrical milling chambers, the cavities of which are interconnected via openings in a connector dividing adjacent milling chambers. An inlet pipe for material which is to be ground is arranged in the central part of an upper chamber cover. The lateral wall of each chamber is connected to an inlet pipe for a gaseous energy carrier and to an outlet pipe for the ground material, said pipes being inclined in the same direction relative to the radius of the chamber. Swirlers for the energy carrier stream are provided on the internal surface of the lateral wall of each chamber. Each connector dividing adjacent chambers comprises at least three circular openings, the total area of which is equal to or exceeds the area of the opening in the inlet pipe. The openings are arranged equidistantly on a circle situated between a projection of the opening in the inlet pipe onto the surface of the connector and a circle that is at a distance from the lateral wall of the chamber equal to the size of the radius of the opening in the inlet pipe.

Description

Cascade swirl mill

FIELD OF TECHNOLOGY. The invention relates to the field of engineering, namely the production of vortex mills for grinding solid materials, powders of which can be used in the chemical, food or construction industries.

A cascade vortex mill is known (see Japanese application J 2009106839, IPC В02С 19/06, published May 21, 2009, priority JP JN ° 20070280894 of October 29, 2007) containing at least two cylindrical grinding chambers whose cavities are connected between themselves with a hole in the jumper separating adjacent grinding chambers.

Each of the holes in the jumpers is made as a valve seat associated with a common control rod and an electromagnetic actuator. The inlet pipe for the material being ground is located in the side wall of the lower grinding chamber. The side wall of each grinding chamber is connected to the inlet nozzles for the gas energy carrier, which are inclined to one side relative to the radius of the grinding chamber. The outlet pipe for the crushed material is connected to the upper grinding chamber.

A disadvantage of the known cascade vortex mill is the low grinding efficiency of the material, which is due to insufficient contact of the gas energy carrier with the crushed material, concentrated in an annular zone of rotation of the gas energy carrier.

The closest in technical essence and the achieved result to the claimed technical solution is a cascade vortex mill (US patent Jfs 6789756, IPC V02C 19/06, published August 21, 2003, priority US s 2003155454 dated February 20, 2002) containing at least two cylindrical grinding chambers, the cavities of which are interconnected through an opening in the jumper separating each adjacent grinding chambers, the inlet pipe for the material being ground is located in the central part of the cover of the upper grinding chamber, the side wall of each grinding chamber is connected to the inlet pipe for gas energy and the outlet pipe for ground material, inclined to one side relative to the radius of the grinding In the first chamber, on the inner surface of the side wall of each grinding chamber, swirls of the gas energy carrier flow are made in the form of open cavities.

At least one outlet pipe has a filter element. On the inner surface of the side wall of each grinding chamber, swirls of the gas energy carrier flow are made in the form of open cavities and elastic, capable of exciting oscillations of the gas energy carrier flow.

SUMMARY OF THE INVENTION

The technical solution is based on the task of improving the well-known cascade vortex mill, in which by introducing new structural elements and new parameters for their implementation, the area of intense contact of the gas energy carrier with the material being ground is increased and thereby the material grinding efficiency is increased.

The problem is solved in that in the well-known cascade vortex mill containing at least two cylindrical grinding chambers, the cavities of which are interconnected through a hole in the jumper separating each adjacent grinding chambers, the inlet pipe for the crushed material is located in the central part of the cover of the upper grinding chamber, the side wall of each grinding chamber is connected to the inlet pipe for the gas energy carrier and the outlet pipe for the crushed material, which are inclined in one direction relative to the radius of the grinding chamber, on the inner surface of the side wall of each grinding chamber are made The gaseous energy carrier flow in the form of open cavities, new according to the invention, is that the jumper separating each adjacent grinding chambers contains at least three round holes, the total area of which is equal to or greater than the opening area of the inlet pipe and which are evenly spaced around the circumference between the projection of the inlet nozzle opening onto the jumper surface and a circle remote from the side wall of the grinding chamber by the radius of the inlet opening hole.

A causal relationship between the totality of the claimed features and the achieved technical result is as follows.

The fact that the jumper separating each adjacent grinding chambers contains at least three circular holes, the total area of which is equal to or greater than the area of the inlet nozzle opening and which are located uniformly around the circumference between the projection of the inlet nozzle opening onto the jumper surface and a circle remote from the side wall grinding chamber on the value of the radius of the hole of the inlet pipe, in combination with the known features of the proposed technical solution provides an increase in the intensity of the contact and a gas energy carrier with ground material, since it is additionally carried out around the holes in the lintels between adjacent grinding chambers where annular turbulence occurs. This increases the grinding efficiency of the material. Additionally, these circular vortices create at the edges of the openings a zone of reduced pressure, which contributes to the absorption of partially crushed material into an adjacent grinding chamber, which is the next grinding stage. Moreover, the grinding efficiency of the material also increases.

Thus, the claimed vortex mill contains swirls of the gas energy carrier flow, made both as open cavities on the side walls of each grinding chamber and as additional swirls in the form of at least three circular holes in the bridge separating each adjacent grinding chambers, the total area of which is equal to or exceeds the opening area of the inlet pipe, placed evenly around the circumference between the projection of the opening of the inlet pipe on the surface of the jumper and a circle remote from the side The grinding chamber can be drained by the value of the radius of the opening of the inlet pipe, which allows efficiently grinding solid materials to obtain fractions of at least 2 microns.

What is optimal is to make the holes in such a way that their total area is equal to or greater than the area of the hole of the inlet pipe established empirically.

The fact that the holes should be placed evenly around the circumference between the projection of the inlet pipe opening on the jumper surface and the circle remote from the side wall of the grinding chamber by the radius of the inlet pipe opening, and this improves the grinding efficiency of the material, is also established empirically.

The holes in the bridges between the chambers are the source of the formation of the secondary vortex process in the vortex chamber. The secondary vortex process acts as a dynamic separator for particles, which leads to the intensification of collisions between particles and coordinates the movement of the crushed material between the chambers. It was experimentally stated that for a stable operation of two vortex processes in one chamber, the number of holes in the jumpers should be odd - 3, 5, 7, etc. The ratio of the area of the holes in the subsequent jumpers between the chambers should increase and depends on the characteristics of the crushed material, the degree of grinding and the number of grinding stages.

BRIEF DESCRIPTION OF THE DRAWINGS.

The essence of the technical solution is illustrated by illustrations, which depict schematically:

in FIG. 1 - cascade vortex mill (front view in section); figure 2 - cascade vortex mill (top view in section).

BEST MODE FOR CARRYING OUT THE INVENTION.

The cascade vortex mill contains a grinding chamber 1 with an inlet pipe 2 for crushed material, a grinding chamber 3, which can be supplemented with a similar grinding chamber 4 and others that form the required number of mill stages. The inlet nozzles 5 for the gas energy carrier and the outlet nozzles 6 for the crushed material and the gas energy carrier are inclined to one side and are located in each of the grinding chambers 1, 3 and 4. The swirlers 7 are located on the inner surface of the side wall of these grinding chambers, and their cavities have an inclination , similar to the slope of the inlet pipe 5. Between the projection 8 of the hole of the inlet pipe 2 and a circle 9, which are conventionally indicated by dashed lines on the surface of the jumpers 10, holes 11 are located. Arrow 12 denotes The main direction of movement of the gas energy carrier is indicated; arrow 13 denotes additional directions of the gas energy around holes 1 1.

It was established experimentally that for the stable operation of two vortex flows in one chamber, the number of holes in the jumpers should be odd - 3, 5, 7, etc. The ratio of the area of the holes 11 in the third and subsequent jumpers 10 between the chambers should increase depending on the characteristics of the crushed material, the degree of grinding and the number of grinding stages. The characteristics of the material being ground, the degree of grinding, and the number of grinding stages depend on the density of the material and vary from 0 to 20%. The lower the density of the material, the more important these indicators are.

Cascade vortex mill operates as follows.

A gas energy carrier is supplied through inlet pipes 5 to each grinding chamber 1, 3, and 4, in which a gas energy carrier stream is generated, which rotates in direction 12. Near the swirlers 7, turbulent excitations are formed in this stream in the form of powerful vortices. The flow of gas energy crosses the zone near the holes 11 with different linear speeds, which causes the formation of an annular region around each hole 11 of additional vortices in the direction 13. Through the inlet pipe 2, the crushed material is loaded, which falls into the center of the bridge 10 of the grinding chamber 1 and spreads in radial directions . Particles of the crushed material do not reach the surface of the side wall of the grinding chamber 1, with the exception of individual large particles that are reflected from this surface and are picked up by an annular flow of gas energy. During the passage of the vortices, the loaded material is intensively crushed. Larger fractions of the crushed material, which have high kinetic energy, are mainly taken together with the gas energy carrier through the pipe 6 of the grinding chamber! Smaller fractions of crushed material make more revolutions in the direction 12 and are more likely to be captured by an annular vortex flow around the holes 11, which further crushes them. Due to the remoteness of the holes 11 from the side wall of the grinding chamber behind line 9, the crushed material is kept from contact with these walls. The remoteness of the holes 1 1 from the central axis of the grinding chamber 1 behind line 8 prevents the feed material from directly entering these holes. The vortex flow around the holes 11 has an increased speed compared with the flow rate in the surrounding area. The vacuum thus created causes the fraction of the crushed material to be sucked through the holes 11 from the grinding chamber 1 into an adjacent grinding chamber 3, where it is likewise further crushed. The probability of contacting larger fractions of the crushed material with the side wall of the grinding chamber 3 due to their small mass in comparison with the mass of particles of the loaded material is very small. They are mainly taken together with the gas carrier through the nozzle 6 of the grinding chamber 3. Smaller fractions of the crushed material are similarly sucked through the holes 1 1 from the grinding chamber 3 into the adjacent grinding chamber 4. The process of grinding and selection of the fraction of crushed material is repeated similarly in all grinding chambers of the cascade vortex mill. The operating pressure for pumping the gas energy carrier is selected in the range of 0.2 - 0.8 MPa.

Thus, the swirls of the gas energy carrier flow are made both as open cavities on the side walls of each grinding chamber and additionally on the bridges between adjacent grinding chambers as openings located in certain areas.

The inventive cascade vortex mill has a comparative by analogs, there are more areas of vortex formation in the commensurate volumes of the grinding chamber, which allows one to efficiently grind solid materials and select the desired fractions of at least 2 microns in size based on the results of grinding.

INDUSTRIAL APPLICABILITY.

The inventive cascade vortex mill is manufactured on standard equipment. Structural elements and units are made of accessible materials produced by the domestic industry in accordance with established regulatory and technical documents.

The device is simple to manufacture, technologically advanced to install and maintain, and reliable in operation.

Thus, the claimed cascade vortex mill is characterized by industrial applicability while ensuring reproducibility of the physicomechanical properties of the obtained ground materials.

Claims

Claim

A cascade vortex mill containing at least two cylindrical grinding chambers, the cavities of which are interconnected through a hole in the jumper separating each adjacent grinding chambers, the inlet pipe for the crushed material is located in the central part of the cover of the upper grinding chamber, the side wall of each grinding chamber is connected with inlet pipe for gas energy carrier and outlet pipe for crushed material, inclined to one side relative to the radius of the grinding chamber, on the inside the swirling surface of each side of the grinding chamber is made of swirls of the gas energy carrier flow in the form of open cavities, characterized in that the jumper separating each adjacent grinding chamber contains at least three circular holes, the total area of which is equal to or greater than the opening area of the inlet pipe and which are evenly spaced around the circumference between the projection of the opening of the inlet pipe on the surface of the jumper and a circle remote from the side wall of the grinding chamber by the value of the radius o the inlet portions.