US1826406A - Air separator - Google Patents

Air separator Download PDF


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US1826406A US425100A US42510030A US1826406A US 1826406 A US1826406 A US 1826406A US 425100 A US425100 A US 425100A US 42510030 A US42510030 A US 42510030A US 1826406 A US1826406 A US 1826406A
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Thomas J Sturtevant
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Sturtevant Mill Co
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Sturtevant Mill Co
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    • B07B4/00Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/025Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall the material being slingered or fled out horizontally before falling, e.g. by dispersing elements


Oct. 6, 1931. 11 .1. STIURII'EVANT AIR SEPARATOR Filed Feb. 1, 1930 3 Sheets-Sheet 2 I}VENTORI W A TORNEY Oct. 6, 1931. T. J. STURTVANT AIR SEPARATOR Filed Feb. 1, 1950 3 Sheets-Sheet 5 INVENTOR 1 1&7?
ATTORNEY Patented Oct. 6 1931 STATES PATENT o IcE V. Tiioiu s .rsTuRTnvAnT, or WELLESLEY, MASSACHUSETTS, Assrenon To STURTEVANZQ MILL oomPANY,*or BOSTON, MASS CHUSETTS, A CORPORATION or MASSACHUSETTS Ain'- SEPARATOR Application filed February 1, 1930. Serial in. 425,100.
;The invention to be hereinafter described relates. to air separators for grading mate- -'rials, and is embodied in a separator of the A =typein whichthe classificationis accom-' 'pli'shed by an" air current moving upward in a separating chamber and downward in a l:settling chamber. The air current is induced by a fan and caused to whirland circulate vthrough the chambers. The materials, to be graded, are fed through a hopper into the separating chamber and are received by a rotary distributor which throws the materials out" acrossthe rising air currentunder the influence -offcentrifugal force.- The lighterparticles or fines are carried upward by the air; current out of'the separating chamber over into the settling chamber where they gravitate downward and are dev livered therefrom, while the heavier particles or ta'ilings gravitatedownward through the I rising air current inthe separating chamber and are delivered therefrom.
I Heavier particles gravitating down from the separating zone in theseparatmg chamber, carry with them some of the fines which 1 adhere thereto, randjthis is especially pro nounced A when sticky .materials are being, classified. As a consequence, these fines have been carried on down with the tailings out of the separating'jchamber, whereas if they could be dislodged therefrom, they would be I carried upwar b q the; whirling rising a r four-rent over into'thesettlfng chamber, and the efficiency of separation would be mate 7 rially increased. 3 -Heretofor'e, a series of short vanes has been providedflbeneath the'lower conical end of Y the separating chamber, and'the air passed from the settlingchamber through the spaces 1' between the vanes up into the separating 1 chamber. IThe air whirling. in the latter tended tocause the heavier particles -gravitating down from the separating chamber, to ,fly out toward the vanes under the influence of-centrifugal force, but the air-curling up afround. the lower edge I of the. separating chamber and the velocity of the air entering ,1 therein "practically prevented the tailings A from reaching the vanes, i 4
A purpose oflthe presentinventionislto lodged therefrom thereby materially increasing theefliciency [understood by reference to the following de-,
dilodg from the r r particles fines ad.
hering thereto, and also to breakup the courser partlclesinto finer particles to some extent. To accomplish this, a main portion of the wall of the separating chamber is formed of elongated vanes having narrow spaces between them through whichthe air passes laterally into the separating'chamber. The total opening between the vanesmay be as great as the total opening provided by the short vanes in the former separator, but the velocity of the air passing between the vanes will be very much less, and will be sufficiently low to allow the heavier particles whirling in the separating chamber ward under the lnfluence of centrifugal force against the inner surfaces of the vanes. )The .length of these vanes is such that the heavier particles will whirl in a spiral path of multiple rather fiat convolutions, and repeatedly ,70
batter andjrattle against the vanes, causing the fines adhering to the tailings to be, disand causing heavier particles to be broken up with mechanical action.
The smaller particles thus freed are win- 7 nowed from the heavier particles and carried up'by the rising air current in the separating chamber and over into the settling chamber,
ofthe separator. Another purpose of the invention isto pro- Vide means for regulating the classification taking place in the upper zone of theseparatting chamber. To accomplish this baflies are provided and are adjustable to vary theg separating effect ofthe air whirling and rising in the separating chamber, so that coarser or finer particles may be carried over into the settling chamber as required. Also these baflles y be justed to Positions where they are inoperative in affecting the classification if desired. y o
The character of the invention may bebest scription of one good form thereof shown in the accompanying drawings, wherein:
Fig. 1 is a View, in vertical longitudinal section, througha separator embodying the invention; A
to be thrown out-;;
g. 4 11s a V r ngto'the'd 5 consisting Q iopeegmtil dietanee'fbeneeth the nppenhell lgv wheibwer'ma otthis"wh chthen materials from the sep z ra r 2 iSa-VieW, in horizontal section, taken on line 2 2 of Fig. 1; t V
Fig. 3*0n an enlargedfseelei's a view, in sectional detail, of some of the vanes;
perspective view ofone of the vanes; i 7 Fig: is a View, in hor iz-ental*eetion, through the separator showing thexl-isposb i' -Q b i iesse d g I i-fig? i k fiigfi ti as: "of one oft'he ha'fis'a'ndit mounting;
' shown thereln as one g vention', v
7 vented.
ig the ood form of the in-, comprises anzzonteneesingd: (Beg:
' hei oniif ithe external bearing earned by; t he ting aha-"m ke the co llarinto the settling cha mber is' pr e Toconduet materialslinto the separator,
ja suitable hopper (not'shown) may be connectedto the intake neck (Fig. 1) which fiends-t0 ,a eonieal hopper fi secured to the --onter cztsingqhead. V *At- -thet'op ofthe' separr-atonare channels 4E9 supporting a housing 5lwnf in i e r n s s ie na le hich may besdriven from any snit z't'ble 1 ley 6 3W n i he hath: 53 pnojeetedown throng h mid oppen 4 intothe isepara ting ehambef,;and oarrie 7 st f N Projeeting'u 'fromth diStrihuto ae p; i (5 mymg 'a; aifle p ete 69.tf11he f ea-11s g the a irt o oirentaiteencl wvhiri rough *the 'ee-p aliatingmic} Settling (':h:tn1b ei"scomprise ea 'dimicztl shell hnbj7 l h a ving va fiange m m ec'l onzen d secured to the 130 511561; v i his shell b enci'l eles end ie spfeced from the p'pen l'i and projects up-thnot h the opengflWi-n' the inner CaSing head-i: Secure'd -to --the upper; end-df tl ie Ii -1h re pfhitee fi Carr -y- I y the Whi 1 and separating efiect; in z he of the Separating chamber, 4 2x 3 5 7? (F s; 1",;-" ni i my proviiled in the present ine'tance of trian in-attom menaceayme the junetme o'fthe -iiieted to imperative positions; 1 wh re they of the.; inner I lie panallel to thennderjsnr fiaeez iiheae; They may be seenpe'din their' "chfierentposnions' -th'e pr-esent' emhodinient itl'ie haifles v mammal an horizontal shztftsfit will un ie steodi th'at they might be mo nted on 'f venticai shafts and ati j'lltecl on veir-tibarl axe;
t sepetetin'g; ehamber; 7
through the outlet opening'in the head thereof, through the fan chamber, down in the I lighter particles of material will be carried upward by the air in the separating chamber the spout 27.-
settling chamber through the inlet opening afforded by the spaces between the vanes and back into the separating chamber. The
over into the settling chamber, and be delivered through the spout 9. The heavier particles will gravitate downward in the separating chamber and be delivered through The vanes 37 constitute a main portion of 5:the wall of the separating chamber and ex- 1 tend from the upper separating zonedown to the lower end of the separating chamber. The upper ends of the vanes are flush with the shell 13 and the lower ends of the vanes are spaced from the conical shell slightly to allow adjustment of the vanes. Therefore these shells and vanes form a substantially continuous wall for the inner casing.
The velocity of theair passing from the.
7 settling chamber laterally between the vanes I multiple fairly flat convolutions in this zone, so that they will be carried around repeatedly and batter and rattle against the inner sura .result, fines whiehotherwise would pass into the separating chamber will be sufiiciencly low'to allow the heavier particles gravitating down and whirling in the zone bounded by the vanes, tobe thrown against the inner surfaces of the vanes under the influence of centrifugal force. Their spiral whirl is in faces of the vanes. Their impact will cause fines adhering to the tailings to be dislodged therefrom and cause the tailings to be broken up more or less, so that the fines may be winnowed out and carried on up with the whirl= I mg rising air current out of the separating chamber overinto the settling chamber. As
out ofthe" separating chamber with the tail- --'ings, are delivered into the settling chamber,
thereby increasing the percentageof fines separated and hence increasing the efliciency of the separator. The vanes may be adjust- 7 ed on their carrying bolts to vary their I spacingas required.
'50 regulation of the class fication 1n themain classification zone within the shell. 13.
The jbaliies 77 are desirable as providing may be adjusted to vary the eliect of the ,whirling rising a r current in this zone, so
thatparticles of greater or lessdegree of finenessmay be separated and carried over into the settling chamber. The handles of the shafts carrying the 'baflies are located externally of the outer casing where. they are conveniently accessible.
. .By my invention an improved separator is provided which efiiciently dislodges from the tailings' fines adheringthereto with mehchanical action and permits the air current to winnow out these finesfand include them shown, and that various deviations may be -bafllesbeing adapted to vary'the separation effect. of the air whirling and rising in the settling chambers having inlet and outlet and a series of relatively movable overlap- They impenetrable with' the main stream of fines delivered to the settling chamber.
" It will be understood that the invention isnot limited to the specific embodiment made therefrom without departing from the spirit and scope of the appended claims.
What is claimed is 1. An air separator for grading materials comprising, in combination, an outer casingf 7 an inner casing, a separatingchamber in the. inner casing, a settling chamber between said casings,said inner casing having a head with an outlet therein, means for causing air to clrculate andwhirl through sald chambers 80 and outlet, and a series of battles in the separating chamber at the juncture of the inner casingwith its head and extending substantially to the outlet opening in the head, said and dislodge fines therefrom to be carried up by'the rising air in the separating chamer. i An air separator of the type comprising separating and settling chambers having inlet and outlet openings between them, means to cause air to circulate through said cham bers and openings and move-up in the'separating chamber and down in the settling chamber, said separating chamber being characterized by'an upper cylindrical POI? tion and'a lower frusto conical portion, the wall of said upper cylindrical portion being and the wall of said lower conical portion being formed by. a circular series of spaced" overlapping vanes, the openings therebetween forming said inlet opening from the settling chamber to the separating chamber. I
4. The invention described by claim 3 in which thesaid vanes are adjustable to vary the area of said inlet opening.
5. An air separator of the type comprising a cylindrical casing, a second cylindrical casing of less length suspended within said first casing, said inner casing having a depending frusto conical wall having its lower end substantially in the plane 02fathei lower edgeof saidfinst easing,
and two nested cones "below: and: eonstlueted g'torenclqse the bottomiopel ihgswdfsi i Quiet '1 {casingand frnsto conicalWall'sofg idlinneri ,:='casing, .saidfrusto conical 7 Wall. ofwthezilmer casing :being formedrwholly et -a .seri es of spaced?overlappingrwanesr ieaehkextendingn "mfi The invention described by claim :5 in
which :thefisaid vanes are relatively adjust-able'to var-.y the lap and consequently the Width from top tO bOttOIIiI thereof.;
. Ofxtrhe spaces between them.
7. In'an'air separator ofthe type having a? V circularpwalledseparatingchamber-and an :ontenannular'settling chamber'gwithrmeans', i v 7 rfqr. causing "air to Whirl within the sepa-- mating 'chambenI'pa'ss out through its top, I
down ;through :the Settling chamber andback throughsnbstantially the lower half of the i height-"of the WalLof the separating charm. her; sai'dllower hal'l; otsaid {separating cham-y her Wall being :frusto .eonical in ishapeaand .7 zcomposedof a seriesof spaced; overlapping" npright vanes ,each of which is pivoted for an opening movement into the r-separating chamber, itheinaj or portion of said 'va'n'es'lwying inside the separating chamber when :ar- :7
v 3o 58. An "air separator l c g ylin inner casing having a centralized outlet =in: -igts cover and an inlet at its vbottom fer esi tablishing, communication between said two casings; means for causing airtoWhi-rl andcirculate :up in the inner 'casi-ngethroughsaid fthrongh saidinlet and a series of lo affles lojc atedgin thep'uppercorner'of-saidinner -casingoutside ofsaid outlet opening. I r 7 ----':9:-"']1he invention described :by claimV S in which each of said bafies consists of a :p'lat-el rangedin theirkopened relation. 7 7
dr ical covered casing, :a smaller cylindrical covered casing; withln said first acas1-ng,-said ontlet,; down between the twocasings and 7 extending radially into .said casing:
'10 "lhe nventiondescr b db y claim 83in" I which saidihaffles consistofzrhcjvahle arti 7 tiionsprojecting'intothe casing he its enter avalil. V
,lLwT-he inventiondescribe-dby claim-8 in which said ba-file's consists of'plates i nzconibinationzwith means for setting said-platesat" yaryi ng inclinations to, the-paith otrnowement 7 ofzthe Whit-ling gair c-nrrents.
Q 1 l 12 llhe inyentieni'described @bfclai-in in I I d i Y which said bafiles consist 'of swivelled 'zplates,
saiel swivels extendingzoutward to the outside i 1 c v of the outer casing for external contrdlxoi the ;;angular position ofsaid balflesl Y
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561564A (en) * 1948-08-23 1951-07-24 Comb Eng Superheater Inc Pulverizing mill separator, having whizzer and directional vanes
US2564595A (en) * 1948-08-23 1951-08-14 Comb Eng Superheater Inc Whizzer separator with helical deflector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2561564A (en) * 1948-08-23 1951-07-24 Comb Eng Superheater Inc Pulverizing mill separator, having whizzer and directional vanes
US2564595A (en) * 1948-08-23 1951-08-14 Comb Eng Superheater Inc Whizzer separator with helical deflector

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