[1]Patented Oct. 20, 193i 1 , 8 2 8 7 1 @ 2 k UNITED 'P T@E@ N.T OFFI PAUL, A HUR. HIRSCH, OF N W E @YORK,- K. Y OUTPER-DING MEANS:FOR F.UEL PULVERIZING MACI-IINES &pplication, fil6d Y@ite@ f, Thi@ invention is a novel otitfeeding meaias ,.or )ulverizing iuachines,,havi.ng ref6rence p@irtictilarly to- tlle pul-@erizing, of coal. or otl-ior ftiels. The invention @ is' herein, shown r, einbodied i-@i a type of pulverizing niachiii6 liaNTing ,i chamberi@d egsing, with aii.operatshaft therein and impact bdaters,.@'or paddle@ ilevolved by the shaft, whi.16 @xial air 'low caus-s progressive advan6e of the@@ r rh a i o tel@ial. being reduced - alth6uoh feature8 of the,preselit: invention may be:otherwise 4@mboclied.@ A prior pulverizer@ of the type aild for the 1-)urpose re,fei-rod to, i8 illusiratod -,ii Iny Patent -i@T6. 1,479,540 of.-Januai-y@l 1924. I in ,,5 Oiie 6f the m,,q' bbje@cts of the present iiivention is tc, improne tl-ie delivery of the ptilI verizecl iiiaterial frorfi tho machine, nami@l@ into'a deliiej?y or fan chambe , ai@d the d-,Scla,@irge thereof froiii the fan chaiiiber, .@nd iii ,2 i) tlie case of ftiel the@admixtur@? thero6f with zidditional quai-iti',,ies of air@,of co,mbiistioh; i,his@l@n@,olving a novel:structure, of deli-@,ery inea'as or fan and the- n-ovel inethod @ or mode of -rati-on sectirod theroby. op -tirth OtliLer and f er objects and 6,dvantagi@g ,)-tp the present invention will be explained iii 'L-he heve"naftejr follonving description of a@ illtistrative embodiment thereof, or,will be apparent to those skilled in; the @ a@t. - 'TO ti@@6 a'L-tLinment of the objects and -advantages 1ef,--rred to the@present invention-corisists in ilhe iiovel method and machine, and thei novel ,-Ipeai- e -of combination, arrango,@ @tir s operat4on I ' ii-ient and @ construction, herein illustrat6d or .5 described. -he Lccoiiip@iiyin drawings- Fi 'is Ill 1, 9 9 sul-)staiitially a ceiitral vertical crosg gecti'on clf aI)iilverizng machine ill--@trating th@ present inveintioii the fu;61 @and ait @@infeed 40 v en ed 0 vn at the i-ight dandth eliv'er@vniedns ,i'- tl.-ie lef-@ eiid of the@ficrure, ri ig. 2 is a detail perspective view sho*ing or or c)ne 6T the pulverizinb, member@ beat s, pa(ldles of -this invention, aiid its@,relation to 4,', k'he fast rotat" ng wheel or. 'dislc which: car-ries it. F.@g 3 is a riglit elevation taken-pii.tly in ,,ection on, the line 3--3 of Fig.,l:'a@nd showiiig 0 the pi-eferred construction of -the deliv&, y faii or blower. 6 @erial No. 112,956.' Fig. ;4,,is pattial persbective view of' a perip@heral ri pO t'on of @@th--: rotarv f an or b@lowor. -Ref@rring in@ detail to the ill-Listrated structure F@-k@. I shows'a piilverizinL,@rAachine 6f the:ho-rizontal typ6, the same as my: afopesa,id Patent 1,479,540, although in sonie cases it co'uld@ as well be arrangod vertically as in my other P t6.nt 1,479,541 of the sarne date. a iM@6unted o-n@it@base@ll: is sh6wn a ey ,Iindrical 11 i@ drum or casiho,, .12 pref 6@ably fixe4 aga iist rotat'lon The drum iiiay be@ constructed 'in tWo@@or'@three radiall@ divid6d sections for the purpo@e of assembly, disassembly and trans@ort:a @ tioii. @ T. he lowe@.righi Iliana part of the 65 casiiig is sh6w-,i " htviiig a dropped @Bxten'- sion14 in' which fbrei@n mat6rial may be collect6d a v@ill be described, a@ removablo cover br @reo6pi@el,e 1.5 beifig attached to the open, @'id6- @of the extension b which the foreign 70 y inatoti al@ inay: be r6moved @from time to time. The@ drum or casing enclose s sixccessive chambers or spaces I and is sho-wn@ as lin6d.:With a steel lining or I ri , ng 17 in each of the pulvere izing spaces 6r chambers the right hand@@on 7 -P) of-th6se linino-s beiiig perforated at 18 abov6 tho eite'nsi6i! 14 to permit 1,,e,,vy a"d foreign f inateri al to be disefiaraed rom the chamber itito the extension. I ruin at its ri-ht end is closed by A ci - 80 The @d r cular 6nd Nvall or castin& 6r head 19 havino, a ce@'nttaloiaxialopening2Ob -whichthe@may tei@i@l to, be,@ulverized can enter the dr-Lim. Th6 head 19 is sliown @formed -with an exten.@ion 21 , th6 lower part of which@ is inclined 85 so @s to a at ria f cilit e, ihe infeed' of mate l@to the PulV@riz,-r:and the desceiit of heav37- @ JEorei(yn matcrials:toward th'e extension4l4.-@ @The extensloiiI9,1:is further@sho-wii as o@,ivii-lff support the bearii, as 2 0 oto on'eof 4- f @ the: per.atiiig 90 S haft @,25 the @oth6r i@nd of the shaft @havip@g a simi ar bearing 26@ supported upon t fixed, ;f a -i r ii e exten sion 'or bracket 33. Th'e 'dri-@in(,r sh,,ift 25 mAy be rotated at high s@e6d throuo-h its 6xterior extens'on 28 in any Q5: red @inann 'for e)@amplo, through belt desi er, aiid ptilley or direct, c6upled r@ao@or tutbine 0 r th@e'lik@@ TI-ie left@ or discharge ei-id of the drum is s hown@ 'as closed bv an end, wdll -or head,@29 @100
[2]havino_, a central or axial openi ng 30 of relatively ecntracted diameter, through which the pulverized materials and air may pass out froiii the drum to the delivery or f an cliamber. The ptilverizing is preferably done wholly insi.de the drum, while the air draft for the final Idiseliarge and clilution of the pulverized ma,terials is provided by a sluction fan or blower located beyond the plilverizing chamthat any of the air admission opening or po@rts ip-ay be regulatable by a damper. Within the chamber 41 may be any suitable sel)aratino- means such as a ma(Ynetic sliell 4c 44 turneci continuously by a shaft 45, these parts indicated in dotted lines. Electroraagnets within the shell may maintain a condition of stroiig magnetism 8o that all iron partieles will be caused to adhere stronoly to 45 the shell An,d thus;c,,i-rried around to the outer portion of the chamber, wliere they are progressively detached froiii the shell by the scraper or fl,,inge 46, thus deposiling the iron particles in the receptacle 47 f rom which they 5o may be i-emoved through the aperture 43. Th@ shafts of the star feed wh6el 38 and of the magnetic sliell 44 may be suita-bly driven in synchroiiism'during the o eration of th p e pulverizer and the speeds inay be'adjust,,tble 55 in any usual mani-ier to reo-ulate, the rate of fuel feed, a slower rate of f ee,cl beir,,g accompanied by a greater degree of pulverization. The fuel passing throucrh the separating chamber 41 desc - ds ' en into the pass,,tge 48 in tso the extensioii 21, ,t@ pldte 49 acting as -a sliield to ins-Lire thle inateritls eiitering witl@ a de'seending motion or preventing their entering into the first pulverizing chal-nb6r above th(@ operating shaft. There may be a single pulverizer cha 65 mb6r wall or head 29. For this purpose a fan bas-, iiig 31 is shonvn, wliieh malt conveniently be integr,,tl with tl-ie head 29. The bracket sLIpport 33 for the bearilig 26 may also be -inr 16 tegral with the fan casing. The fan casilig has also a peripher,,tl extension 34 providinu a tangential exit passage or discharge 'o5, analogous to that shown iii said prior Paten't 1,479,540, but herein shown directed iipward2o ly,asi@fre4uentlynecessar forblowingout y or deliverina the mixed fuel and air to, a furnace The infeed of the fuel may be by a hopper 37, suitably stip lied with coal or other map 25 terial after preliminary grinding to a suitable size. The hopper 37 loads to a, regulatabi,e fe@ed comprising a rotdted star wheel 38, bring-riing successive fuel portions into the following passage 39, the rnoterials passing go downw,,trdly by oravity into thc. separating chamber 41, the wails 42 of which may be integral extensions of the castilig 21 containing the central inlet apertui-e 20. One of the walls 42 n-tay contaiii an opening 43 for the within the di-um, or a series of them, ani Fig. 1 sliows a first redtiction chamber 51 and a second redliction chainber 52, within which the fuel will be progressively pulverized by the fast rotating beating means 70 mounted within each chamber upon the shaft 25. Thus the shaft is shoivn as having pinned or keyed to it in each chamber a, hub 54 on which is mounted a disk 55, around sa adn-iission of air and it Nvill be understood @ Beyoiid the second pLiTverizing chamber 100 series @of @ peripher,,Ll be,,tters or paddles 56. Such a beater structure has been already explained in said prior pateiit, althougli 'the str-Licture of the beater hereof is considerhbly impr6ved witla resulting ilicrease o'l. 80 efficiency and length of life, as will be explained.. Located between the first aiid second pulverizing chambers 51.and 52. is shown a means for,enecting ,t stidden obstri-icting of the 85 whirlino, motion produced by the fast rotating pa(fdles @in chamber 51. This whirl obstructor-inay,be in the form of a series of blade-like vanes 60 set edgewise to the axi,-LI advance of the material and extending fron-i 90 or near the periphery Qf the chambers to or toward th@ shaft. Preferably the vaiies 60 are relitively stationary, and they inay stand radially or otherwise. The action of such vanes fias been described in said prior pat- 95 eiit. The several vanes may be mounted and intercon I nected by means of a periphertl ri.ng 61 attached to the lining 17, and an inner rino, 62 loosely surroundina the shaft 25. 10 bers, and exterior to the pulverized discharoe ihe eire'umference of which are inounted t75 52 and between it and the f an casiiag is shown another set of obstructing vanes 65, with an outer ring 66 intere6nnecting them. TI-iese haite a special function hereii-i, in additioii to the function possessed by the va,,-Ies 60; 105 this to be explained more f'ully hereinafter. -A-n inner ring 67 unites the inner ends of 65. It @vill be noticed that within -Lnd between the pulverizin- chambers there are no annular or other division walls or so-called dia- 110 phragins, nor any substantial obstruction to the axial prolyress of the materials, between the axial entrance aper'uiire 20 in the head 19 and the axial exit aperture 30 in the head 29. This ape'rture 30 is of considerably less 115 diameter than the pulverizing chambers, an,,l of less diameter even than that of the pulverizing elements, that is, the diameter f roiii tip to tip cf the paddles. In these and otlier respbcts to b6 explained the present inveiition 120 is materially different from said prior patent and other prior structures of Nvhicli I ain familiar. The apert-Lire 30, indeed, is shown of su6h small diametor that materials pi-og@essing through it p,,tss into the interior of 125 the rota-ry f an structure, an importaiit coiisideration. @ T-he f a-n chaniber 32 may be alinost of the full diaiheter 6f the inain casing, a,; shown, but the fan 70 is preferably of considerably 130
[3]ow mo Sinatler-diamete'r.@'It@'@sh n, unted hiib 71 keyed tothe,sh.%ft@25;-";-&;no*el@,-.and efficieiat fan co@nstruction is I shown wlieiein the litib 71 carries: a@'diskloreir6ular, plate 72, op. posite,to w hich @is @ .,ring or aiinular plate 7,3; the disk and the%r'mg.supporting@ and b@ing iiiterconnected by, a. geries of "fan: blad4bs 74. With this iiivention th@@ bla@des 74 are@'arranged to@handle the mental air of c6iii@; 10. bustion which raay @ripntprioeduced into'the@f an chainber 32 by wa;y of .,the @ akial iiilet, 36 which@may be dam@er goveriied, the @i.r being dr"twn@ in and 'Whirle.d, centrifugally througb the faii charnbe!7 anc[ out by the discharlre 35,; 15 while the pulverized materia-I or fuel @-nd@ its carry.ing stream of air are hahdled by a:sep-a:@ rate set-, cf blades or vanes T6 m6unted@ it@ the inner 6r right hand side of @ the disk @2. @ It@ is intended that there shall be an enti@re @ series 20 Of fuel vanes 76, spaced'around@tlie periph@ er of the disk 72 in the manner indicated:irk s ' @3 and 4. Each blade, 76@,rnay constitute th-- flange or, bent portion of a plate or base 7@, which latter may adjustably b6 irnoitnted 2P: on the disk near,its peripher-Y by means@of. aii@ outer bolt or pivot 78, the plate formed w,ith a @concentric slot 79 (,-n-aged by an: inner bolt 80,engaged,in a, thre@'d@d.@ perforation 81 in the di.sl@:.,, By this @ arrangement the fuel @o wl -iirling fdn blade@ 76 may be adjusted in theira ngleandoperation. Figs.3and4-shoiv, two @dijfeieut angular adjustm6nts@,o,f these, inember@,@while Fig. 3 in dot-and-dash,@lines shows the two extkenies of adjii@tment a@ pref@. 44 erably used. It will be 6bservp-d that the fuel whirling blades:76 are slanted from tlie- radius, wliereas the supplemental a;ir whirlino, blELdes 74 are preferably@radiitl@. @ The slai@t of the @ blades 76, and the means of @ adjustmei@t 14@ thereof, afford a,n advantageous action as '@@ill be described herein constructed @aild mounted in a novel i-nanne:r giving substantial advantages. In .4 the hammer:-m6unting Qf@ said prior patents the continuity@ of the, surfaces of the sup portIng disks is substantiall@:interrupted near the periphery by protrudin- portioiis 6f the pad@dles and the bolts by @@vhich they are inount,#Q ed. By comparati-@e t , ests it has been f 'ound that' these protruding elements are not imer6ly the s-ource.of wear @and expense, but owin-a to their being iri the pdth of the centrifugall@ flowing powdered materials they caiise a disO@ ttirbance of the flow and impair the efficlency of the reducing'@,ati6n. These objections alre @vholly over4iome by the, present c6nin which' the side s of th, e disk a;@e un.intei-rupted byprot-rusion and t-he whirllnb_- matoria:ls arp- abl@ to.@ ass ; smoothly t ou wardly intothi2., p'aths of th@ beaters or@pa.ddles, rendering the, beating action mor6 thorough aiid@act-Lially resultino,@i-n a g@eater fineii,e@s of @UlVerization and@'7increased' capacity "1)@ i sho,@i.-n" iii 'their @@.!Thepkcldles;or@ KersEtr,(,- r,eliitive. @rriLng.6mpnt,.in Fig'..'I@',-,and@@the pye-@ ferr@d: detilils, of@ @structlire" 2. - E4 ach paddld cbmprise-s .a T-sha,pe b6dy 85 inounted Z, 170 pi@e@erably s,@@iiigably at-.tl,ie p,e riphery: of the disk 55.', The Onlarge4 @@ottio-.h or, head @of ihe paddle body 85 i5 fornied. Nvitli a'n @olitei@ flanae 86, and a remo@a@ie@i)addle, f ace @late,or block 87 is. provided I -,vith a should6r SS engagino; th6, flanoe 86 giving an;iiiterlocking action and .,,e@aablink the centrifukal.,,thrlast @of.. @the' bl6cks 87 'to be receiv@d b.y the.flange 86 Witl-iout any shcai-ing strain upoii tl-ie bolts 89 b'y whibh -th6 @block. is @setured fo @the: bo.dy... Th,e 'forward ide o@,: fice 90-..of; the: block 8'@ @:is @o shown inclii,,i@d foi-v@a@dly-giving an@effect;.Ve beatink action and@ al'Lowingzfoi@ wear by abr,,I_l sion at a oreater, rate near @the periphery@ of the@ block without substantia;llv impairi@ig b '5 the effectiveness of the@action @@The thin'i-w,@ @ortioh 91 of -the paddle b6dy 85 is perforated and..in use is arranged in a re66@s in t]4e po,-. riphery of t]@e disk 55,, r6 "as hot,''to protrlide b@yondi the flush surface, of - the: disk.@ @ This redess is p@eferably in@ tli4a for'm of kerf 92, and thp-re rnay b4@ a separate recessor@ kerf 7@or etch of the paddles or,the@e. mayi be@@ a contiiiiious kerf or oove extending7 e-,itil'oly gr around the periphe al @ed-ae of @ the clisk 55. r The -Nveb 91 is held in pla6e in the l@eri @@ 02 P5 by- means of a traii@verse stud'93, - v@Iiieh, Aiay -be, a i3imple pin -without head @ai @ either end; I aiid this,.tud in turn may be held @aaainst@dis-, @pla6eii@6nt@ bv a, cott6i pin, 94, @crew or othe@ means securin it to the Nveb 91@ of the@ addle. '00 9 , p liastea d 6f a single integ di@k 55: provided@ with@ an edge,, groove or this disk may be built-lip, for exal-iip o circular plates spaced -sliohtly qpari c - ommodate @f, 105 the paddle shank 130,t-ween t-liein. While only disk two paddles are @ shown on @ each tliere The paddles, hammers or beaters @ 56- are, may be the usual'plural number, e. g. between 65 cf the machine, with reduced power. 12 and'IS or even as low D's 8 and@ as . hi h 9 as @24. 110 @, The paddl6 constructi6n so described @at@-@ tains @th@ 'advantages referred to. @ All wear is practically eliminated exe.--pting ut)on, the face, pl@tes 6r blocks ' 87 @ which Are' reaclilv sc, that the, lif@e of, th6 ap@dr@tl@s raiiewable, 115 a@iidthe@ease,of'reiiewal-a@6- eatly@eT!han'cecl@- gr Not only is efficiency ine'r6ased@ @s explained, biit@ the @ first cost of the iiyaehin&' is @r@ediieed C sin e thp- renewable face bl66k 87 n 4y b 11 osed@ 6f hard teol while t-he @a;ddle bod , 86 p Or@ gr a e !nay b,-- of 'ohe@per rnaterial as a low d 'Zo of eel St In o ration, e, th machine coi@bines a regula@tea air and coal:feed at one end@ a@nd@ at@the other end a:sli6tioiri@fan '6f loW pr6@sure and 6wer i6ceivi-h 125 6- tho. puiv6riz6d materials tncl p dis6hatging tl-iem contri.fu&ally. In the fir@t @ulveriziiig efi'amber 51 ,in:y@n@eta-I E@nd- other' h@@vy maietial not'rembvod@:in the sepa@iitin(@ own'ce-ritr chambcir will belthro d ifuoall@ wn ' @m 130 into the The entering,fliel is
[4].in rlstruckby,the@.addles, aiidthrowiitowhi' ing rotation of Iiigh sp@ed. The fast rotation creates high centrifugal pressur6 so - that th6 materials, especially the heavie@ particles,@alre periphery o @] kcpt near th@ r Iiiiin@, 17 of . th@ reducing chamber,. Progressive attrition of the materials is prodticed by@,the c6mbinaticia of delivered blows upon the particles a-nd the su.rf ace rubbing contact iinder, tlie: centrif @ulo gal pressure, and @the m,ate@rials graaually proaressing axially at the, saine time. @ Owing to Che enoimous centrifugal force, even relativel fine particles are thrown against the y I'ning, ancl tr@,vel along it,, rocILLeiri abr - I p g a 1,5 sioii. Inthis@vaythelininglandthe@padd!6 faces take the brunt of the reducing 1 action and these two eleinents are. readily and@ cheaply replaceable. @Succeeding the first reducing chainber ate, the fixed. vaiies 60 @Avhich 20 totally obstruct the whirling motion while permitting substantially uninterrul,)ted, itxial pi,oo,ress. Pulverizing occurs at this point, not l@erely by the imDa6t of the, fast NvI.iirlin(,, potrtioles against the'fixed vanes b-Lit 'o ruby 25 bing and attrition along the surface @ of the vanes and moreover,.by an action of thi-onving back of the heavier particles ii@to the redueing charnber, permittino,, only th6 finer particles to 1:)rogress, as explained in Faid patent. Passing froin the vanes 60 the ifiaterials under treatment are again thro-@,vn sueddenly into: whirling motion aiid are :ftlrther r@ducea by impact and attrition. The -Dei'iplier'al s-Li"face of the intetior@of the,,tjD@@-ratus is sub:35 stantiall @ free from: obstrtiction to axial y progress. There are, no rings or diaphraoiiis a,nd the high centrifugal pres@I.Lire @is maintained throuahout the length '6f the rnall LLp to the point@ where the reclucingl,,Ilction is 4o completed. At t-Iiis point the vanes, 65 op-' erate to overcon-ie the centriftigal pressure and perinit the wllirling matters to be drtwn i , n-wardly to the contracted outlet 30. :,The dynaiiiie ener@,7 of the wi-iirling inatters 46 striking against the stationary vanes 6-0 causes them to spread so as to reach the outlet aperure- In effect the centrifuo-al actilon co nv,e -e to a ceiltripetal motion. The en is rt d d wall 29 @ acts as @ a dam ,,o as to, confine @ the 50 peripherally whirlilig material tinder Iiio;li pressure or head,@and the vanes 65 constitute a iiieaiis of @ 6vercoming the pressure and' bringing the matei,ials to the outlet., r@gr@ss. The suction fttii, as istin-o@ th6 _D of @55 the pulverized materials froiii tlle main casiiig and their discharge to the place of use, is preferably@ of low power and pressurp- notwithstailding tl-iat it pti-fakes of @ the high speed of the shaft 25. An ordinary type of f,,in, or oiie of the full di et . of. the@ padam er d.les i-night I resul.t in excessive pressure or sliction and tend to extract tl-ie wh'rlino, raatt(,rs I from the main casing faster -than is consisten I t withefficienev and fiijeness of redui,,tioii. fourths: f the; diarhete'r 6f the reducing de0 vices:gives satisfactory results. It keeps the air and.materials. in progress but 'avoids excessiv6 suction. Maximum :internal ceiitrif ugal pressure is thus iuaintainable, the di- 40 ve@tin(r vEines.65 op(,-r-@tin& to brin,-, the materials t6,the oiitlet and.the f an operatino, upon them for firal c6ntrifugaldischarge. This refers to tha blades 76 and @one f ea-ture thereof is tlieiirelatively. -small @ size and iheir qcljustability of ai-igle. 75 The disclosed fan 4 as a aischarge means for a pulverizin ibill can @be advantageously 9 -Lisod with other ty m pesof illthanthe'mpact mill@ he@ein disel6sed for example with ball I so mills, roller nulls Une -JLity 6T slich @a fan is-to @iiiaiiitain t@he pro.gi-ess of the w'hirliiig niatters, coal dusl, or other material in suspension in air, through the pulverizer and its outlet, and a second duty is to deliver these materials @ to the furnace or otlier place of use, and freqtiently to lrovide and mix therewith siii)plemeiital air of combustion. These two.ftineti6ns are iii soine respects quite differen't, @ and the best results are fou'nd to be 90' ,tttaina . by t: separation 61 functions as lierein disclosed, enabling the meterials being treated t6 be handled and discharged separately f rom the supplemental air. A loW SUC7 ti6ii ,iiid pressure is desirable f6r the coal 98 diist or other material espp-cially w hen the iiiterior of@ the ma@iii casing is progressively cle@ired for example as alreacly described in connection;with the vanes 65.. . On the otheihand the. deliverv of the coal dust and air i6o iiito@ia furndee demands enough pressure to overcome the res-Lstance of the burners and @iping, with son-ie spare,pressure to regulate distriblition. The present invention gives sdtisfacto@y results for both purposes and I 05 this is effected nioreover by the novel fan hereof op6irating in the usual type of f an hous;.ng annexe t6 :the @ pulverizer outlet. The fan chamber, except neai- the eripher@ aiid disp charge is effectually divi-ded into separate,, ilo chambers, by tl-ie uiiperforated disk 72. At the P701yerizer side of this disk is what iiiay be terined'the dust chamber and at the other or oiiter side the air ch,,imber. Operating in the -,ii.r ch,,Lmber ,ire the wliirlin- bladc-s 74 - wh-ch i]5 L operate to draw air in, t@hr6iigh the axi,@l I iiilet 36 @aiid, t-l-irow it ceiitriftigally out throli(yh il@ie dischara(, 3-0, i,,,ith i.-el,,ttively high presstir-- @and:,Yate 6f flo-,i,. The @solicl m-,iter il.s ot@clust never re@iches@the ,tir chainber or con- 120 tict the air blades, but i.s, handled entirely sepratel,.y, iii the di-ist ebamber. The remov,tl)le blad(,,s 76 tihereby tali:e al.1 tlle'bi,unt o-.f@ the wcar froin the progressin(r solicl- Ing,terials, enablinp, :the f'aT@ 'to' be ieiie@vecl by 125 m(,,rely ihese @p-,,.rts,, tl-ilis grep-@'ly mil@inalzilig ui)keei-) e-xl)ense. The swivelled ,tttachment of the dust blades 76 permits the suction and pressure 1'have found @llat a. fan of not, ov4@r threeto be ',,tdjusted to the conditions. Experi-, 130
[5]1 828,712 ments have indicated that the nearer the blades 76 are set to a, tangential position t;.iie finer till be the pulverization. Thus the u ,Ld,j st-meiit shown in Fig. I giv@s slower (I; 6-.ier pul-@erizati n than that Scharge and : 0 sb.owii iii Fig@ 3, @Vhich will result in coarser plilverization btit, iiiereased cclpacity of output. The arrangement thereby permits the machirie to be adjusted ih accordance @with 10 the 1-naterial being oro-Lind and the desirell Pineness of prodiict, the, angle of the@ dust blades to be set to the: most advantageo-Lis an Yle. will be obs6rved that the adjustment of 1 5 the dust blades and the resul ting discharg of dust does not ,Lffect th diseliar@e of tir by e blades colisist of angle pieces arrarlged to @roje6t laterally@,with iiieans,for adj-asting their@angular r6lationship to the air blades. 4. A fan for f66ding pulveriz6d material comprising a casing, a shaft rotatable@ therein, a disk oli@ the shaft@ separaiiiig the intprior of the casing into@ a dilst@ cl@aiiiber and a@, wider air: @ i.-hamber, rad dis@osed air ia"'Y blades sectir6d to the.,tir side of the disk, and nonradial dust blades secured to the opposite '@5 sid@ of the disli:, @"id dust blades @be@ing adjustable to diff-ei,ent angles whereby to vary the feedi-ngd, action of the f an. 5. A fan as in claim 4 ,tnd wherein the @disk, air blades, tnd dust blades @onstitute:la rotor of coiisiderably smaller diameter than the' the air blades 74. The two act'i-ons are in-, interior of the casing. dependent 1-ip to the point, -where the disIn testimony whereof, I have affixed MY el-iarged matters r@eel@, and mix in the general -,ignature hereto. 20 discharge outlet 35. The divisio'n of the fan PAUL ARTH,UR HIRSCH. 015 chamber into two subehamb@Brs and the separation of tho functions of the fan as described may be brought about in various w@tvs. The dust blades could be made as.in25 tegral extensions of the @-%ir blades, and:the !)O disk 72 adjusted axially to relatively increase the size and action of th@ diist blades a@d decrease those of the air blad@s, and :vic'e versa. It is to be understood- that dampers may b,@ 30 empl6yed to regulate the, admission of sup5 plemental air, or the. flow of the',combined materials to tha furnace, a-nd such regulations can be made, witl-iotit aftecting the ,:Pulverizing a6tion. O@rdintiriIN; an adiust-. 35 ment of air flow or, discharge by the f an w6uld. loo ea-Lise a change in the fuel olitflow a@d thereb y alt@r the actions withid the pulverizer; where7, as with th6 -preseiit inventio even very,hi n gh ,.Lir pressures can be supplied- for distribuii6ii 40 to 13omb-Ltstion @o ints'with6-Lit substantially altering the constancy of the aetion@ and progress thro-Ligb. th@ pulverizer. It will thus be seen that I hav6 des6rib@d a pulv6rizing machine enibo4@ii@@. the 45 princi ples and attaining the o@ject8@;6f th iio prese nt invention - but as many matters -6f metho d, operation, structure, combination arr,,tn, -,ement and detail may b6 'vari-ously modifi ed -withol-it departinl, from the prinei50 ples of the invention it is n@t intended to limit 115 the same to such rs except so far as set forth in the app= ClailAs. What is
