US1922421A - Furnace - Google Patents

Description

Aug. 15, 1933. L w, DAMAN 1,922,421

' FURNACE Filed May 28, 1930 3 Sheets-Sheet l 2/ 3/ 2 I as //Vl N TOR.

Aug. 15, 1933.

L. W. DAMAN FURNACE Filed May 28, 1930 3 Sheets-Sheet 2 FVG. /O

fizzy/M2 4. ATTORNEY 5 Sheets-Sheet 3 #66 INVENTOR.

7'7'OANEY.

L. W. DAMAN Aug. 15 1933.

FURNACE Filed May 28, 1930 ular manner of deliveringiit'ior manipulation, as pointed out in theclainis for novelty following a the invention; r a

The objects of theinvention areto increase the efficiency of furnaces in the generationof steam and the production of hot water'in heating-plants 'or fcrrother purposes, by so handling thecoal or other hard fuel as to-maintain its movement from its. original condition to its stateof ash, V

under edge'iof the bar inside of the'lug 19,-thus Patent d Au 1s, 193s Theinvention relates toa furnace, as: described in the present specification and-illustrated in the accompanying drawings. that formpartof v the same.. a u v a The invention consists essentially in the novel 'means employed for automatically manipulating the fuel within thefir'eboxand: of the particdescription inwdetail of anfacceptablefformcof andthereby obtain in heating units anlequivalent of the maximum properties of the fuel; 'to pro mote the combustion: of the fuel 'whenit reaches the firebox and thereby facilitate its" forward movement, and at the same'time eflfecteconomyt in regard to the quantity of fuel consumed; to eliminate the smoke nuisance, and consequently utilize the full complement of heating gases for the purposesof the furnaceyand generally to provide in heating and steam generating equip 'ments' a heating element that will produce first class results at a minimum expenditure of money on fuel and labor. I l

In the drawingavFigure 1 is a perspective view of the interior of the'firebox from the rear showing some of the particular features concerned in this-invention. r

' Figurel2 is an elevational detail of a grate bar Figure 3 is an elevational detail of an'eccentric shaftforming part of the grate'mechanism-"a'nd here shown as brokenaway.

Figure 4flisla plan view of aneccentricbox showing thestroke adjusting niechanismi I 1 Figure 5 isa fragmentary'detail showing a grate bar and the mountings.

Figure 6 is a perspectiveview'of the furnace front showing the motive powerand operating connections'fifl V Figure 7 is a detail of worm and'gear connection."'f' Figure 8 is a sectional, detail of the progressive feedmembers. 7 3 15L h Figure 9 is .a perspectivedetailof theaspring dog operating plate. 7 Figure 1 is an elevational view ofthe furnace frontshowing the. air, cooling connections. Figure-ll is a detail of;the,-hopperagitator implan I; r r a 7 g the backwall32land legs 37. V I

The grate bars are inclineddownwardlyffrom "Figure 1 2 is a sectional detail ems fire door Figure 13' is'a fragmentary viewofthe pivoted 1 end of a? grate 'bar and pivot.

:-Like' numerals-of reference indicate spondingparts in the various figures. 'Referring tothe; drawingsxithe numerals 15 indicates a grate bar-of which there are ayconcorrefsiderable numbnand this grate bar is formed i withthe jaw 16 extending into one end ofthe bar ina very slightjupward mcline and forming the lug-17 a little offset downwardly fromthe' main portion of the bar. f r I The teeth 18 extend upwardly fromthe bar: towards thev other end and at this otherend the bar is reduced to form the lug119' curvedgdownwardly. v V The'bearing slot 20 extends; upwardly from the one end this shaft terminates in the journal 22 and the square tip 23, and at the other end in the journal 24.: I

The bar bearings 20 are mountedion: the ec- 7 'centrics 25 and 26, therefore by rotating theshaft the bars are alternately lifted and dropped. a v The shaft 27 is one of a pairsand these. shafts grate bars and these grate bars rock on the shafts These-grate, barsand the-shafts mentioned g v aresupported in a frame '28isecuredto a'furnace' 1 front 29 and the sidewalls 30 of the frame '28 rise 1 above-the grate bars and'extend'to-a short-dis tance inwardly overthe lugs'l9 as indicated at131.- a The shafts 27 areparalle1ly arranged in the central portion oftheframe and are rigidly-"sej cured to the furnacefront andto the backwall 32 ofthe frame 28, and are shownon either side of thecentral fuel trough 33 which constitutes the path of the fuel that is constantly fed intothe furnace and which is intended to'rise overlthe inner ends or: jaw ends of the grate-bars and be 3 deposited'thereon: r I l The eccentric shafts 21 are journalled. atthe 7 rear ends in the bearing plates '34 adjustably secured over the slots 35 in the back -wall'32 above the tierods 36 of the frame, which extend befront 29 in tween and are secured to the furnace the shafts; 27 to theishafts 21 and the latter shafts at their front ends'arejournalled in the bearings 38; in-conformance withthe shape of the frame 23 and therefore the tendency of the fuel is constant movement, but naturally combustion occurs and incandescence, which results in the deposit of the ash below the grate bars practically from end to end and thereover at the lower side, as it is estimated that the fuel will under the most unfavorable conditions be completely consumed at the lower end of the bars.

The trough 33 extends through the furnace front under the fuel hopper 39, which during the operation of the furnace is kept constantly full of fuel.

The eccentric shafts 21 are journalled as explained in the bearings 28 in the furnace front and the square tips 23 project through these bearings and furnace front.

The gear case LG is rigidly secured to the furnace front and contains a worm gear 41 fixedly mounted on one of the eccentric shafts 21, there being, as will be readily understood, a similar gear at the other side of the furnace on the other eccentric shaft 21, in fact, while the mechanism is explained on the one side it is obvious that the same mechanism occurs on the outer side in so far as the grate bars and their operating parts are concerned. 1

The worm shaft 42 carries a worm coacting with the worm gear 41 and is journalled in bearings 43 on the furnace front and extends into and through the casing 44 and at the inner end thereof carries the bevel pinion e5 coacting with the bevel gear 46 mounted on the driven shaft 470:. The bevel gear 416 naturally drives two pinions, one for one side of the furnace and one for the other side of the furnace, thus the two shafts 21 are kept in constant motion at the speed desired.

A motor 48 operates through its shaft 49, a gear set 50 constituting the change speeds from which the crown gear 51 and pinion 52 are driven and consequently the shaft 4'7. The speed changes are effected by the lever 53 in the customary manner in such mechanisms.

The eccentric boxes 5l-and 55 are mounted on the driven shaft 4'7 and have the arcuate end faces registering with the peripheries of the eccentrics 56 and 57 fixedly mounted on the shaft 47 and contained in said boxes.

The blocks 58 having the inner arcuate faces 59 slide in the boxes 54 and 55 and are adjusted in said boxes bythe wheels 60 and 61 respectively so as to lengthen or shorten the stroke of the eccentrics in the boxes and consequently the travel of the feeding members, through the screw spindles threaded in the back walls of the boxes and swivelly attached to the blocks 58.

The eccentrics 56 and 57 may be operated at as many speeds as may be provided in the gearset and also the eccentric shafts 21 and grate bars. In this instance there are three speeds as customary in the driving of motor vehicles, which are usually termed low gear, second gear and high gear. 1

It will beseen that the eccentric shafts and cocentrics may be driven at the rate chosen, the

y former by the worms and worm wheels and-the latter by the driven shaft 47 of the'eccentric shafts. At low gear the grate bars will rock very slowly indeed, just keeping up the motion. At second gear or intermediate speed the rocking will be more pronounced, and at high speed the furnace grate throughout will be very well shaken.

The portion of the trough extending through the furnace front forms the hopper box 62, in which the plunger 63 operates, this plunger 63 being pivotally connected by the connecting rod 64 to the eccentric box 54 or crank mounted on the driven shaft l7, so that during the rotation of the driven shaft the plunger is intended to reciprocate in the hopper box thereby pushing the fuel dropping down from the hopper into the hopper box 62.

The sliding bottom 65 of the trough at 66 and is connected to the swinging bars 67 through the pivoted dogs 68 the dogs being pivotally secured at 69 to the bottom 65 and pivotally secured to the lugs '70 rigidly secured to the underside of the swinging bars 67, said bottom 65 having the tongue 67a from the bottom thereof.

The dogs 68 are formed with the pusher flange 71 extending downwardly from the arm 72, which is slotted projects forwardly from the hub 73 mounted on the pivots 69 and having the lugs 74 dropped therefrom and pivotally secured to the lugs '70, thus insuring the parallel swinging motion of the bars .67 and bottom 65.

The dogs 68 operate in the slots 66 in the bottom 65 so that at the rearward movement of the swinging bars 67 there is a pause before the bottom 65 moves and it is .during this pause that the dogs swing on their pivots anddisappear in the rearward movement, but in the beginning of the forward movement they swing upwardly and push the fuel, but this forwardmovernent moves the parallel bars and bottom a short distance ahead and this movement continuing progresses the fuel in the trough 33, until the trough is quite full and overflows on to. the grate bars on either side. 7

The coupling '75 is pivotally secured to the swinging bars 67 by the pivots 76 at either side and is formed with the body '77 having the tongue slot '73 providing for a limited lost motion in the strokes and at the rear of said body the jaw 79 and pivot 80 joining it to the connecting rod 81 extending from the box 55, in which the eccentric operates to move the bottom 65 through the strokes of the bars 67.

The bevel gear '32 shown as mounted on the driven shaft 47, coacts with the bevel gear 83 on the shaft 84 which carries at its other end the bevel gear 85 coacting with the bevel gear 86 mounted on the shaft 87 which maybe used for a blower mechanism, not herein shown 01' described. a

It may be explained that between the back wall 32 and furnace front 29, the air chambers 88 on either side of the fire box form the bases for the brick work and have the front walls 89 slotted at 90 intermediately under the flat tops 91 of said chambers, the said front walls 89 having the bevelled undersides 92 adapted to form the edges 93 to cut clinkers.

Thechambers 88 extendthroughthe furnace front and the air boxes 94 cover in said passages and are fixedly secured to the front and have the inlets 95 connected by the pipes 96;00 a supply of air preferably above atmospheric pressure or supplied by a blower under a forced draft system.

The flexible metal fireproof t'ubings-Q'Tand 98 extend from the outlets 99 of the boxes 94 to the the doorsl00 and 101 and particularlyto the inlets 102 and 103 entering the chamberslOd respectively which are situated'betwee'n the perforated linings 105 and the dished doors.

The hopper 39 in use isv sometimes bridged by screenings thereby holding up the feed, consequently it is desirableto' agitate the contents of the hopper and this is done by introducing the said trough, eccentric sh I eccentrics and journalledfinv said front and saidv poker 106 into the slot 1071in the hopper. "wall .cent'rics and iournalled. in said front :and'said towards the lower end and thiepoker. 106Jforms an arm from the eccentric strap. losf'encircling- .the eccentric 109 mounted on thedrivenshaft '47.

.The agitation by the waggling-poker-keeps thefuel from clogging up the. hopper and insures regularity in the feed. i The'eccentric shafts 21 journalled 'infthe-pla'tes 34 are adjusted in the slots 35 by the eccentrics 96 mounted on the tie rods 36 andsupportingsaid plates. 1: h

In the operation. of this invention, the hopper is filled with coal :andkept filled by-rhand or'by .any other conveyer mechanism, and thisi'coa'l drops intothe hopper box and from'gthere. is

pushed forward by the plunger asihas alread'y been-explained, and kept in its forward movement until it progresses throughinto the "troughbe tween the sides of-ithe grates formed by the" gratebarsr This trough is filled land; overflows onto the grate bars, which are lifting and dropping alternately, this being accomplishedby the rotation of the eccentric shafts, eacheccentric on, these shafts being the reverse of the adiaeente'ccentric; I

so that the grate bars lift and fall insequence respectively, that is to say, one lifts and the, next :onefalls. and the next one lifts 'andthe next-one until it eventually reaches a state of iash, :of course by this means very hot fire-may be maintained though in thelslower movement of, the "feed and of the agitation the 'strength of the fire is considerably reducedand these changes in speeds maybe made bythe variable speed mechanism :by means of alever attachedv thereto in very much the same way that speed changes are made in vehicular traflic.

Theout'standing advantages of' course are the promotion of combustion, the-absence of clinkers J and the steady maintenance of the feed.

What I claim is:- I I 1. In self stoking furnaces, a' furnace front, a

' '''l firebox frame rigidly secured to-said front, am'og tor having its shaft cperatively connected. to driven shaft, a mechanical stoker driving the fuel into the centerof the firebox and operatively con nected to said driven shaft, a central fuel trough -1 in the firebox, pivot shafts rigidly secured to the furnace front and firehcxframe on either side of a s having alternating frame. adjacent to the side wails of saidframe,

grate hare pivotally mounted on said'pivot' shafts V v ,and means connecting said eccentrics to said at'their inner and bearing on said eccentrics at their outer ends, means connecting said sticker to said driven shaft and means connecting said eccentrics to said driven shaft: e

2. In self stoking furnaces, a furnace front having shaft bearings, a hopper and motive power "equipment connected thereto, a-firebox frame rigidly secured to said front, a motor having its shaft operatively connected to-aidriven shaft, a

' mechanical stoker driving the fuel into thecen ter of the firebox and operatively connected to said driven ishaft, a central fuel trough in the .-I trough, eccentric, shafts having alternating ec-' frame adjacent to the side walls of. .said frame,

grate bars pivotally mounted on said pivot shafts at their inner 'ends and bearing-on saidieccentrics at their outer ends, means connecting said .stoker a to said-drivenzshaft; andmeans connectingsaid eccentrics tojsaid driven shaft. 1 ,3. Inself lstolting furnaces, a furnace front,'a

firebox frame havings'ide' walls overhanging the grate, a back wall standing .on legs and tie rods .securing'the back wall and-legs to the front, .a *motor having its :shaftoperatively connected to a driven :sh'aft,": a mechanical 'stokerdriving the fuel into the center of. the :firebox andoperatively connected-trio, said driven shaft, a central fuel trough in the firebox,- pivot jshafts rigidly secured to 'the'furnace front and; firebox frame "on either side of said. trough, eccentric shafts having :al-

ternating :eccentrics and journalled .in said front and .saidframe adjacent tothe said walls of .said 1 frame, grate bars ,pivotally mounted on said lpivot into change gears and a driven shaft operatively connected to the gear set giving the changes in speed in the severalmovements,i a-mechanical 'stoker driving the fuel into the center of the fire-' box. and operatively connected to :said driven? shaft, acentral fuel trough inthe firebox, pivot shafts rigidly secured to ,the furnace front and firebox; frame on'either side'ofsaid trough, eccengtric shafts having. alternating eccentrics and'journalledin said front and said frame adjacent to the side walls of said frame, grate bars pivotally mounted onsaid ipivot shaftsat-theirjnner ends and. bearing on eccentrics at their outer ends,

means connecting said stoker to saiddriven shaft,

.and'means connecting said eccentrics to said I a .centralqfuel trough in the firebox, pivot shafts rigidly secured to the furnace-front and firebox framefon. either side of said trough, eccentric -shafts having alternating eccentrics and journalled in said front and said frame adjacent to the sidewalls ofasaid frame, grate bars pivot ally mounted on said pivot shafts at their inner ends and bearing on eccentrics at their outer ends, means'connecting said stokerto said driven shaft,

driven shaft.

6. In self'stoking furnaces, a furnace front, a firebox. frame F'rigidly secured to said front, a

'motor having its shaft operatively connected to a driven shaft, a. mechanical stoker having a plungeroperating at the lower end of a hopper. and connected to an eccentric on said driven shaft and driving the fuel into the firebox, a central fuel trough in the firebox, pivot shafts rigidly secured tothe furnace front and firebox frame on 'a firebox' frame rigidly secured to said front,..a V

either side of. said trough, eccentric shafts having alternating eccentrics and journalled in said front and said frame adjacent to' the side walls of said frame, grate bars pivotally mounted on said pivot shafts at their inner ends and bearing on eccentrics at their outer ends, means connecting said stoker to said driven shaft, and means connecting said eccentrics to said driven shaft.

7. In'self stoking furnaces, a furnace front, a firebox frame rigidly secured to said front, a motor having its shaft operatively connected to'a driven shaft, a mechanical stoker having a reciprocating plunger and a sliding bottom having disappearing dogs reciprocally operating in the center of the firebox, a central fuel trough in the firebox, pivot shafts rigidly secured to the furnace front and firebox frame on either side of said trough, eccentric shafts having alternating eccentrics and journalled in said front and said frame adjacent to the side walls of said frame, grate bars pivotally mounted on said pivot shafts at their inner ends and bearing on eccentrics at their outer ends, means connecting said stoker to said driven shaft, and means con,- necting said eccentrics to said driven shaft.

8. In self stoking furnaces, a furnace front, a firebox frame rigidly secured to said front, a motor having its shaft operatively connected to a driven shaft, variable speed mechanism introduced between said motor and driven shaft, a

mechanical stoker having a plunger and a car rier plate operating at varying speeds controlled by said variable speed mechanism, a'central fuel trough in the firebox, pivot shafts rigidly secured to the furnace front and firebox frame on either side of said trough, eccentric shafts having alternating eccentrics and journalled in said front and said frame adjaoent to the side Walls of said "3 frame, grate bars pivotally mounted on said pivot shafts at their inner ends and bearing on eccentrics at their outer ends, means connecting said stoker to said driven shaft, and means connecting said eccentrics to said driven shaft. 7

9. In self stoking furnaces, a furnace front, a firebox frame rigidly secured to said front, a motor having its shaft operatively connected to a' driven shaft, a mechanical stoker driving the fuel into the center of the firebox and operatively connected to said driven shaft a' central fuel trough in the firebox"; pivot shafts rigidly secured to the furnace front and firebox frame on either side of said trough, eccentric shafts having alternating eccentrics and journalled in said front and said frame adjacent to the side walls of said frame, grate bars pivotally mounted on said pivot shafts at their inner ends and bearing on eccentrics at their outer ends, means connecting said stoker to said driven shaft, Worm wheels mounted on said-eccentric shafts and worms having their shafts operatively connected to said driven shaft.

10. In self stoking furnaces, a furnace front, a firebox frame rigidly secured to said front, a motor having its shaft operatively connected to a driven shaft, a mechanical stoker driving the fuel into the center of the firebox and operatively connected to said driven shaft, a central fuel trough in the firebox, pivot shafts rigidly secured to the furnace front and firebox frame on either side of said trough, eccentric shafts having alternating eccentrics and journalled in said front and said frame adjacent to the side Walls of said frame, grate bars pivotally mounted on said pivot shafts at their inner ends and bearing on eccentrics at their outer ends, means connecting said stoker to said driven shaft, Worm Wheels having casings secured to the furnace front, worm shafts and worms having casings secured to the furnace front and forming bearings, and gear mechanism connecting said Worm shaft to the said driven shaft. 7

11. In a self stoking furnace, a hopper, a trough having a sliding bottom and pushers therein, a plunger reciprocating under said hopper, a driven shaft, eccentrics mounted V thereon, boxes forming straps and having connecting rods therefrom, arcuate adjusting blocks in said boxes having adjusting screws, parallel swinging bars connected to said 'pushers and bottom, and a coupling having a tongue slot receiving a tongue from said bottom having a limited movement in the slot, said coupling joining a connecting rod and said parallel bars.

LOU IS W'HEITZEL DAL IAN.

eccentric

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