US1655577A - Classifier - Google Patents

Description

Jan. 10, 1928. I 1,655,577

A. H. STEBBINS CLASSIFIER Filed Dec. 24. 1926 2 Sheets-Sheet 2 HVVENTORX A TTORNE Y Patented Jan. 10, 1928.1

, UNITED STATES T E T orrllce.

ALBERT H. s'rnisnrns, OF LOS nnennnsfcnninonnrn.

' CLASSIFIERi Application-filedDecember24, 192 SerialNo. 156,847.

This invention relates to classifiers of the Fi 1 is a side elevation of a classifier contype in which the materials passing downwardlywithm a treatment chamber'are subjected to the action ot air currents adapted to separate the finer coarser particles. V 7

In employing classifiers of this general type it is dihicult to effect a thorough'treatment of the materials through the use of air blasts alone, or through air. exhausts alone, and if the materials tobe separated relatively fine it is necessary to subject them time and time again to the action of the separating air currents.

The present invention is therefore directed particles from the to a multiple treatment classifier which is so constructed that materialspassing downwardly through the treatment chamber are subjected repeatedlyjto the separation action of different aircurrents to extract the lighter from the. heavier "particles, and also to a construction for employing both suction and blast forces in effecting the separation of the materials.

One or the features of the present invention resides ina classifier casing which is adapted to be supported in an upright position so, that the materials to be treated may pass downwardly "therein under the influence of gravity, and in means for directing air jets across the path'ot the materials from the opposite sides of the casing 'to deflect the materials back and forth from one side of the casingto the other as they move downwardly therein.

vAnother feature of the invention resides in means for removing the lighter particles that remain suspended in the air -from the casing by exhausting them therefrom in a direction at right angles to theair jeta and also in settling chambers that are adapted to return to the casing the particles that settle in said chambers. i a

Another feature of the invention resides in the novel arrangement of parts for supplying air under pressure to the treatment chamber and for exhausting air therefrom, and also 1n the means formtroducmg air from the atmosphere into the casing.

t invention.

' Other features of the invention'and novel HFigq2 is line 22 of Fig 1; 1

Fig. 4 on an enlarged scale is a 'perspec- 'tive viewv ot the upper portion of the classifier shown in Fig. 1; the walls of the classifier being partly broken away to show the internal construction; and

Fig. 5 is a sectional View taken ontheline 5- 5 ot'Fig. 2.- 1

In the emb diment of the invention shown the separation of the materials is effected in.

vthecentralcasing 10 which is adapted tobe supported in an upright position so that the materials to be treated will pass downwardly within the casing under the influence of gravity. The casing 10 183 shown as square in cross section and as having one pair of opposite walls 11- and a second pairof opposite'walls 12. The casing is preferably made square, or rectangular inscross section-in order to better accommodate the} air blast pipes 13 which extend lengthwise ofltheside walls 11:0f the casing, 'and'to' accommodate by adjusting th s d combination of parts in addition to the above will be hereinafter described in connection with the accompanying draw ngs, WlfllCll illustrate one good practical form of the In drawingsthe dust extracting chambers 14 which are arranged lengthwise of the side walls12 of e Casing, as will be hereinafter more fully explained; i I j Thematerials to be treated may be doli.vered-tothe upper endof the casing lOby the feed hopper 15 having the central discharge opening 16; and-the rate at which the materials are supplied tothe. treatment chamber by the hopper 15 may becontrolled gate 16. j A'r under pressure is supplied to the air blast pipes'18 by a blast .fan 'or the like 17,

and the upper ends otthe pipes 13:are connected tothe fan 17 byfthebran'ch pipes 18. asbest, shown in Fig. 3. The'strength of the air supplied to the blastpipes '13 may be controlled by I adjusting the sliding .gate 19 (see Fig.1);

As thematerlalsbeing treated pass down- ,wardly within the casing 10 they are deflected back andf forth from" one side wall of the casing to the other by air jets which-j are directed transversely of thefl'casing 10 i from the opposite side walls 11 thereof, and tothis-end in the construction shown each sidewall 11 of the casing is provided with a large number of slots 0: air discharge new 11 of the casing between a pair of adjacent nozzles. As result of the construction just described it will be seen that the materials downwardly within the treatment ca being treated will be detlected back and forth a number of times while thcv pass The number of air dis har 'e nozzles 29 can gate 23 ployed, and the length of the treatment cas ing will depend largel'yupon the nature of the materials being treated. If the classifier is designed to treat relatively coarse materials a comparatively few discharge zles may sutlice to etl'ect the d ration, butit the classifier is to he to separate fine, dust-like I necessary to subject the mate i time and time again to the separating 5M 1 a ot the air blasts delivered by the nozzles 20.

The heavier materials which pass downwardly within the casing 10 to the lower end thereof will be collected in the discharge spout 22 froinwhich they may be withdrawn from time to time by opening the discharge It. is necessary to remove from the casing 10 the liner particles that remain suspended within the air, and this is accomplished, in accordance with the present invention, by providing a large number of air discharge openings 24- within the opposite side walls 12 of the casing. It is desirable to introduce the air withdrawn from the casing 10 into'se'ttling chambers in order thatit will be the larger particles that may escape through the openings 2&- will have an opportunity to settle, and to this end the settling com-- partmentsle above mentioned are provided,

These compartments are conveniently constructed by providing the classifier casing with the side walls 25which extend laterally from the treatment casing 10 'to the air e2;- haust pipes 26 mounted at each side of the casing 10 in spaced relation to this casing, as best shownin Fig. 1. lVithin the charm hers 14 formed between thespaced side walls 25 are mounted the inclined floor plates 27 between which are formed the settling com- I partments and the arrangement of these floor till plates is such that the materials that settle within the compartments will slide down these inclined plates to be returned to the casing lOfor further treatment.

The air exhaust pipes 26 above mentioned are preferably made square or rectangular in cross section, as will be apparent from Fig. 4, andair is exhausted fromeach of these pipes by connecting the upper end of each that the suction produced within the pipes will cause the air in which the lighter particles may be suspended to pass through the openings 24: into the settling chambers t l, and this air will travel upwardly within the settling chambers to escape therefrom through the discharge slots 29 into the exhaust pipes 26'.

It air is exhausted from the treatment casing 10 by the suction pipes 26 more rapidly than it is supplied to this casing by the blast pipes 13 a partial vacuum may he produced within the casing 10, which will materially ajti ect the separating operation. Y It. may therefore be desirable to provide means For introducing air from the atmosphere into the casing ll) and this is accomplished, in accordance with the pres nt invention, by the construction shown, wliercby air is led. into the settling cmnpartments adjacent the lower end ot' each inclined floor plate 27, the ar *angementbeing such that the air introduced from the ati'nosphere will pass upwardly through the materials sliding down the inclined floor plates 27, to assist in the separation of these materials. In order to introduce air from the atmosphere into the classifier casing near the lower end of each inclined floor 2. an air guide plate 31 is disposed adjacent the lower end of each floor plate to provide the air passage 32 at the under face of each plate 27, and air is ad mitted to the air passage 32 through the opposite side walls 25 of the casing by providing these side walls with the air inlet holes The upper portion of each plate 31 is rounded as indicated by 3% to close the upper end of each air passage 32; The lower end of each plate til. it will be noted, extends into an opening Qt of a side wall 12, the arrangement being such that the materials which are delivered by the floor plate 27 to the air guide plate ill will be directed by the latter through an opening into the casing 10 for further treatment.

It will be apparent from the foregoing description. when read in connection with the drawings, that air under pressu e supplied to the opposite walls ll of the casing 10 by the air blast pipes 13 to produce the air jets above described which deflect the materials back and forth as they move downwardly within the casing l0. and itwill be understood that the lighter particles which remain suspended in the air within the casing 10 are withdrawn therefrom through the discharge slots 24 into the settling compartments 14 so that the particles that settle within these compartments will.

lfll

at the lower ends of these be returned to the casing; 10 for further treatment. Such particlesfas may settle within the suction pipes 26 will collect in the discharge hoppers 35 at. the lower end thereof and from whichthe materialsmay be withdrawn from time to time. The air blast pipes 13 are preferably provided with the discharge openings 36 at their lower ends so thatthese pipes may beblown out from time to time by opening the gates 37 pipes. I

' What is claimed is i 1. A classifier comprising in combination anupright casing, means for delivering the 1 materials tobe treated to thenpper portion of the casing to pass downwardly therein under the influence of gravity, air blast nozzles provided alonggthe opposite sidesxo'f said casing andadapted to directair cur:

'1 rents across the casing tromgone wallto adjacent the other wa l so that theyfwill lntersect' the path ofthe materials moving I downwardly within the casing fromits op.-

posite sides, and means for removing from the casing the lighter particles that remain suspended in the air.

2. A lassifier comprising in combination,

ofwthe casing topass downwardly therein under the influnce 'of gravityt. means" for directing jets of air into the casingfr'o'm the oppositesides thereof and arranged in" staggered relation to each other so that the materials passing downwardly within the casing will be deflected back and forth from one side wall of the casing to the other, and means for removing from the casing the lighter particles that remain suspended in the air.

3. A classifier, comprising in combination,

an upright, casing, meansfor delivering the materials to be treated to-the upper portion of the casing to pass downwardly therein, meansfor introducing jets of air into the casing from the opposite sides thereof at intervals along the path of the materials moving downwardly in the casing to cause the air jets to intersect said path from its opposite sides, and means for exhausting air from the casing at points between the adjacent air jets, i

4;; A classifier, comprising in combination, an upright casing having four opposite side walls,means for delivering the materials to he treated to the upper portion of the casing to pass downwardly therein, means for introducing jets of air into the casing from one pair of opposite side walls to cause the air jets to intersect the path of the materials moving downwardly within thecasing, and means for removing air from the casing through openings formed in the second pair of opposite side walls. e 5. A classifier comprising in combination,

delivering the I a relatively long slender casing adapted to in a pair ofopposite wallsjofthe casing throughout [the length of the casing andadapted to deflect the material passing downwardlywithin the casing back andforth from oneside wall togthe other, and means for removing from the casing thelighter particles that remainsuspended in the air.

' 6. A classifier comprising in combination, an upright casing having foiiropposite side walls, means for delivering the materials to be treatedtotheupper portion of the casing 'to pass f downwardly therein, a pair of air blast pipes arranged/along two of thefopj'posite walls of the casing and provided with air} apertures for directing air jets into's'aid casing from its opposite side walls and; a pair of air exhaust pipes extending lengthwise of the two remaining walls of the (13S? ing and provided with air openings; for "exhaustin airirom the casing at points between said air jets. V r

A classifier comprising in combination, an "upright casing, means for delivering the materials to be treated to theupper portion of the casing to pass downwardly therein under thelinfiuence of gravity, means for introducing jets of air into the casing from the opposite sides thereof at a multiplicity of points along its length-means for forming a series of settling chambers along said casing and provided with inclined floors for directing the particles that settle in the chambers back into said casing for further treatment, and means for-removing from said chambers the lighter particles that remain suspended in the air.

8. A classifier comprising in combination,

an upright casing. means for. delivering. the

materials to be treated to the upper portion of the casing to pass downwardly therein under the influence of gravity, means for introducing jets of=air into the casing to intersect the path ot'the materials moving downwardly within the casing, and means for exhausting air from said casing through aside wall thereof in a direction at rightangles'to the path of the airjets, including settling chambers along said casing and provided with inclined floors for directing the particles that settle in the chambers back into the casing for further treatment.

9. A classifier comprising in combination, an upright casing, means for delivering the materials to be treated to the upper portion of the casing to pass downwardlytherein under the influence of gravity, means for introducing jets of air into the casing from the opposite walls thereof to intersect the path of the materials moving downwardly within the casing, and means for exhausting under the influence of gravity, means for introducing jets of air into the casing to intersecttlie path of the materials moving downwardly within the casing, means for exhausting air from the casing through a side wall thereof in a direction at right angles to the patlrof the air j ets, including settling chambers along said casing and provided with inclined floors for directingthe particles that settle in the chambers back into the casing, and means for intrcducing air mto the casing at the lower end of each inclined floor to pass upwardly through 'thematerialssliding along the floors.

11, A classifier comprising in combination, an upright casing, means tor delivering the materials to be treated to the upper portion of the casing to pass downwardly therein under the nfluence of gravity, means for introducing jets of air into the casing from a pair of opposite side walls thereof to intersect the path of the falling materials,

means for exhausting air from the casing through opposite side walls thereof in a direction laterally to the air jets, including settling chambers along" said casing and provided with inclined floors for directing the particles that settle in the chambers back into the casing for further treatment, and

means for introducing air from the atmosphere into the casing at a multiplicity of points lengthwise of the same.

12. A classifier comprising in combination,

a four-sided casing constructed to be supported in an upright position and provided with an air conduit extending along each side of the casing. means for delivering the materials to be treated to the upper portion (7f the casing to pass downwardly therein under the influence of gravity, two of said conduits positioned at the opposite sides of said casing being. provided with a series er air apertures disposed lengthwise of the casing to produce air jets across th e'casing to intersect thepath of thefalhngmaterials,

means for delivering air under pressure to the .two conduits, said remainmg pair of conduits being provided with a series of apertures disposed lengthwise ofthe casing for exhausting air from the casing, and means for exhausting air from the two cenduits last mentioned.

In testimony whereof, I have signed my name to this specification.

ALBERT H. STEBBINS.

Images