CN2390699Y

CN2390699Y - Eninforced eddy-current sorter

Info

Publication number: CN2390699Y
Application number: CN 99248780
Authority: CN
Inventors: 徐家驹
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-10-20
Filing date: 1999-10-20
Publication date: 2000-08-09
Anticipated expiration: 2009-10-20

Abstract

The utility model relates to an enforced eddy-current sorter, which is mainly composed of a motor, a top cover, a sorting impeller, an inner cylinder and an external cylinder. An upper opening of the external cylinder is provided with a partition, and a material inlet is arranged below the outside of the partition; the top cover is a fine powder collecting chamber and is arranged above the external cylinder; the motor is arranged upright on the top cover, and the shaft gland of the motor is fixed to the center of the top cover. The sorting impeller is composed of a wheel disc, a wheel cover, balancing blades, axial flow blades and sorting blades and is arranged on the shaft head of the motor; the inner cylinder is in barrel shape and is hung on the partition; a stationary flow-guiding blade row is arranged between the inner cylinder and the partition. The utility model has high sorting efficiency, compact structure, small space size, small abrasion of the sorting impeller and long service life.

Description

Forced vortex streaming grader

The utility model relates to a kind of industrial attritive powder grader, particularly relates to the grader that a kind of classifying turbine is the turbine structure type.

Industrial attritive powder grader up to now, the powder particle that all is based on different quality without exception have these characteristics of different centrifugal force and it are separated in centrifugal force field.Powder to be fractionated is by the classifying turbine of blower fan suction grader, and powder is subjected to the effect of two opposite power of direction simultaneously in grader, i.e. the centrifugal force and the gas-flow resistance of rotary blade generation.Under the classification point condition of setting, for the following fine powder of classification point, gas-flow resistance is greater than centrifugal force; And for the above meal of classification point, centrifugal force is greater than gas-flow resistance.Therefore, fine powder will flow to into classifying turbine with air, and meal is then outwards thrown away by impeller, thereby reach the purpose of classification.

Industrial grader of the prior art, its basic structure pattern all is that the classifying turbine with a plurality of blades is placed a roomy cylindrical shell, powder to be fractionated is entered between classifying turbine and the cylindrical shell by central feed tube from bottom to up by air carrying band, fine powder is drawn along with air flows to into classifying turbine and from the top, and meal is then thrown away by classifying turbine and drops on thereupon in the oblique cone tube that is connected in the cylindrical shell below.One of defective of the grader of this structural shape is that classification efficiency is lower, near the fine powder of cylindrical shell inboard or be difficult for being sucked by classifying turbine, or is not classifiedly just directly dropped in the oblique cone tube by meal is crowded; Even near the fine powder of classifying turbine, in the face of blade and a large amount of squeezing of meal of rotating at a high speed also are difficult to enter calmly classifying turbine.Secondly, remain static at circumferencial direction with respect to classifying turbine owing to powder.Therefore, every powder that enters impeller all will produce collision and friction with graded blade, thereby the wearing and tearing of blade are very fast, cause unbalance easily and vibration.Especially the occasion of classification hard powder, classifying turbine often needs to keep in repair continually.In addition, fall to meal in the oblique cone tube and tend to be trapped in wherein, be difficult for discharging, even more serious when especially running into water content viscosity powder bigger than normal.At the impenetrating mouth place of feed pipe and oblique cone tube, also always build up a large amount of powder, must rapping just can drop.At last, also be that the most outstanding defective is, adopt the grader of oblique cone tube eliminating meal, its bulk (i.e. height) often quite big (height of awl tube is about 5-10 times of effective graded region size) installs for processing and manufacturing, transportation and Operation and Maintenance all brings a lot of difficulties.Just because of the defective and the deficiency of above-mentioned several respects, make the application of the grader of traditional structure pattern be subjected to certain restriction.

The purpose of this utility model promptly is the improvement in addition suitable to the grader structure of conventional version, to improve the classification efficiency of grader, reduces its bulk and is convenient to Operation and Maintenance.

To achieve these goals, the utility model is provided with one and encloses the axial flow leaf grating that rotates with classifying turbine and a static guide-ring is set between inner core and dividing plate in the periphery of classifying turbine, thereby constitute a kind of vortex patern classifying turbine, form and the almost synchronous forced vortex of classifying turbine so as to the air stream that makes carrier band powder to be fractionated, make fine powder enter classifying turbine in an orderly manner with the air smoothness, meal is then got rid of laterally by eddy current.Meanwhile, by interior, the annular space between the urceolus is introduced with powder to be fractionated, introduces with the central feed tube that replaces common employing, thereby can save meal discharging oblique cone tube commonly used, has reduced the bulk of grader effectively.Be described in further detail below in conjunction with the technical characterictic of specific embodiment the utility model forced vortex streaming grader.

Accompanying drawing 1 is the structural representation of the utility model forced vortex streaming grader;

Accompanying drawing 2 is the cross-sectional view of classifying turbine;

Accompanying drawing 3 is that A is to partial view;

Accompanying drawing 4 is the partial view of static guide-ring;

Accompanying drawing 5 is the schematic diagram of graded blade and axial blade.

1-5 with reference to the accompanying drawings, the utility model forced vortex streaming grader are mainly by motor, top cover, classifying turbine, and inner core and urceolus constitute.Urceolus 7 is a cylindrical shape, its dividing plate 4 that has suitable for reading, and its outer side-lower has material to be fractionated and air intake.Top cover 3 is a fines collection chamber, is fixed on the flange of urceolus 7 tops, and its bottom center has fine powder and air intake, and its outside has fine powder and air outlet slit radially.Motor 1 is vertically mounted on the top cover 3, and it seals 2 central authorities of being fixed in top cover 3.Classifying turbine 5 is by wheel disc 12, and wheel cap 13 and balance blade 9 and graded blade 11 constitute, and are installed on the spindle nose of motor 1, and the periphery of its graded blade 11 is provided with the axial blade 10 that quantity equates.Inner core 6 is the cylindrical shape of both ends open, is hung on the dividing plate 4 in the urceolus 7 by fixed claw, and its lower end becomes certain taper, and guarantee within the specific limits with processing and assembling means in gap with axial blade suitable for reading in it.Be provided with the static guide-ring of being made up of a plurality of circular-arc guide vanes 14 8 between inner core 6 and the dividing plate 4, each guide vane all is welded on the dividing plate 4.

The classification process of the utility model forced vortex streaming grader is as follows: along with the rotation of classifying turbine 5 and devoting oneself to work of air exhauster, the powder to be fractionated of given concentration and AIR MIXTURES are by means of the suction type pneumatic conveying principle, the interface of side-lower enters the urceolus 7 and along the circular passage between inner core 6 and the urceolus 7 and rises outside urceolus 7, rises to back, tube top and turns round, flows into static guide-ring 8 for 90 ° with the low speed work.Powder is done 90 ° in an orderly manner after pre-dispersed and is turned round in static guide-ring 8, and enters axial flow leaf grating 10 with higher flow velocity.In axial flow leaf grating 10, powder forms forced vortex gradually through the leaf grating acting, and its angular velocity of rotation is identical with the angular velocity of rotation of classifying turbine 5, and simultaneously, the polymerization powder ball that may exist is further disperseed.Powder flows out after the axial flow leaf grating 10, does the forced vortex motion around classifying turbine 5.At this moment, promptly form an annular powder layer and rotate synchronously with classifying turbine around classifying turbine 5, its bed thickness equals the blade height of axial flow leaf grating.

The ring-type powder layer is just as " air sieve ", and wherein fine powder will be sucked in the classifying turbine 5 by blower fan with air stream in order and glibly, enters subsequently in the fines collection chamber of top cover 3 and from outer side interface to discharge.Just in case have coarse dust to sneak into classifying turbine, then, therefore, be thrown out of immediately as long as powder one enters because powder enters the peripheral speed (differing several magnitude) of the flow velocity of impeller far below impeller.The coarse dust that quilt " air sieve " throws away along inner core 6 inboard sedimentations downwards, or enters in single scraper-type discharger, or enters in the mill thorax that pin grinds or roller grinds under the double action of following rotational gas flow and gravity.So far, whole classification process is promptly finished undoubtedly smoothly.Certainly have a small amount of fine powder and taken out of the forced vortex fluid layer and sedimentation downwards by meal is crowded, but because the axial flow leaf grating still has enough abilities to form inner circulation, therefore, the annular space that still these fine powders can be brought back to again between the inside and outside tube mixes with feed stream, repeats above-mentioned classification process.

Compare with the grader of traditional structure pattern, the utlity model has following obvious advantage and disadvantage:

1, owing to the utlity model has perfect fluid mechanic model, shape around classifying turbine Become the forced vortex with the classifying turbine synchronous rotary, added in the flow process continuously powder to be advanced Row disperses and flows back to the receipts fine powder by inner loop, therefore has very high classification efficiency.

2, introduce powder stream to be fractionated by the annular space between the inside and outside tube, the central feed tube of common employing and the oblique cone pipe of removal meal have been removed, not only thoroughly got rid of the possibility that discharging is detained and is built up, and made grader bulk shorten 103～112.

3, grader both can use (a single scraper-type discharger for example is installed in the bottom) separately, also can be used in combination with pin mill or roller mill, thereby have very strong versatility and adaptive capacity.

4, simple in structure, compact and easy to operate, the classifying turbine wearing and tearing are little, long service life.

Based on above advantage and characteristics, the utility model can be widely used in the various attritive powders of classification.

Claims

1, a kind of forced vortex streaming grader is characterized in that being made of inner core, urceolus, top cover, motor and classifying turbine; Described urceolus is a cylindrical shape, its dividing plate that has suitable for reading, and its outer side-lower has material to be fractionated and air intake; Described top cover is a fines collection chamber, is fixed on the flange of urceolus top, and its bottom center has fine powder and air intake, and its outside has fine powder and air outlet slit radially; Described motor is vertically mounted on the top cover, and its sealing is due to the central authorities of top cover; Described classifying turbine is made up of wheel disc, wheel cap and balance blade and graded blade, is installed on the spindle nose of motor, and the periphery of its graded blade is provided with the axial blade that quantity equates; Described inner core is the cylindrical shape of both ends open, be hung on the dividing plate in the urceolus by fixed claw, its lower end becomes certain taper, between suitable for reading and axial blade certain interval is arranged in it, be provided with the static guide-ring of being made up of a plurality of circular-arc guide vanes between inner core and the dividing plate, each guide vane all is welded on the dividing plate.