US1559048A - Boiler furnace - Google Patents

Description

' Oct. v 7. 1925- 1,559,048 Y J. A. PACKARD BOILER FURNACE Filed April 22. 1921 4 Sheets-Shoat 1 TOR ATTORNEY J. A'. PACKARD somsa wanes Filed April 22. 1921 v Oct. 27,1925.

4 Shah-Shoat 2 Oct. 27, 1925 1,559,048

' J. A. PACKARD BOILER FURNACE Filed April 22 1921 4 Sheets-Sheet 5 MOTOR u I I 4 n I m I G q i W E 25 1) M J W a I} m. a 5 8 J M E 5 0 I "w W 4 1 l I I I l I l l l l l l l l I l l I l I lm L m 0% Z w Z O u /5 fl m m .f

AIR nsssunz I l 1 i I l 5 ciao: I l I i WITNESSES Oct. 27, 1925- 1,559,048

v J. A. PACKARD BOILER FURNACE Filed April 22, 1921 Patented Oct. 27, 1925.

I l r 1,559,048 PATENT OFFICE...

UNI'I'EDv STATES James. A. mm, or MILWAUKEE, wrsconsm. BeILEa rtmmicn Applieatien iiled Apri1,22 19;2 semi No. 463,441..

To all whom it may concern .1

Be it known that I, JAMES. Although; a

citizen of the United States; ancl'resident ing drawings, which are a part of this speci- 10 fication. I

The invention relates .to stokers, vmore particularly forboilers. and ofthe inclined reciprocating: grate type;

v Qne-of the obje ts. of this. invention isto provide afstoker having a grate. composed of a plurality of, reciprocating grate units, adjacent units movingfin opposite directions I with a f ed. slide carried by those. units; moving in the same; directiongso as to. advance the fuel over the grate,jsaicl unitsibeing dist e m v ment oi hejfilelll further object of the invention is to provide a reciprooating grate unit madeup of a. plurality of? removable grate sections.

A. further objeet. of. the invention is. to

provide an. agitating mechanismin the feed hopper to prevent clogg ng of. the fuel. I I I section WhlCh 11'ee,d.,renewal. ,withoHtiliavmg therein.

' fi 'therlobject-ofthe invention isato provide impo led meanstfor clumping and rush ng the ash- A. further. object; or the, mum. is, to

' provide means. for, furnishing blast. airqto gratescand. to indica e the'pr of he he ai A/further object efthe invention] isto vide; air, conduits between, the sides of the grates. and.-t11.e outer Walls of thefur- The invention further consists intheisev eraleatu es hereinafter. set. forth, and more par icu1ar1v efinel r ms a th emolusion hereofj Inthe drawings Eigrlliis aside, elevation View of a stoker "embodying the. invention rFig; 2 is a plan View. thereqfiparts. being broken] away; .Flg, .3,.1s at. front end.

view of. the furnaceyFigj. 4c, is a; section taken o the, linemen-.4; of, Fig-L 21;. Fig; 5. is a secontaken o11.the.line..5;..5 of Fi 4;; Eig i6 isza detail view f e d. slide,

The furnace fram nclud s. f ont 1- 111111138, rear columns. 9,, inclined sidememvhers. 1 0; mountecl o rtl lo ie-fiolillimspangl conhas metal. blocks plosed 0.11 inclined Support t facilitate showing modi ied. for

nectedat their lower ends to a bottom frame 7 member 11.

1 air to passfrom the pit into the space above the grates, the passage [of air acting 'to 'cojol the bIOCks. The bottom frame memher '11 18 removabl y; mounted t11ereo11- The furnace shown is constructed gwith grates between the. outer, and middle @101- umns-B. 1, Each grate comprises. ailplurality of movable-grate sections 19 and each grate section is made of a. plurality of} grateunits 20.; The. units ZOf i'ming .a;grate section are secured tQgQther in any suitable manner, asby lugs 21' insertablebetween spacedprojections 22= p pp t n grate bar the. lugs of adjacent units abutting each other and, having a suitable fit. between. the

lugs 21 on thebar 23. This feature ne'rmits of ready renewal of those partsjofthe grate to replace the Whole grate section The upper grate unit' 24 of? eachjs'ection is pref crab-l of stepped formation, having air holes 25"thereifn, ancl th'eiother' units of the section are off archeclf formation having air holes 26 therein the size or number of thBSe holes 26 inoreasinglfrom thati ofithef pre- .o fiwhioh ride .onflthe-flangesl of, rollers 30. and the Web. portions 31 of. which: aredi's- This construction permits. each grate section tomove up aiid, downinen inclined position,,, the. connection between: thev bars andthe rollers keepingthe, grate sections in,

alinement.

Adjacent. gratesectionsare preferably The, columns 8 are connected together by'a front plate 12' antlf doors l3 hinged tothe end columns provide access tofthe space beneath the grates.

posedlbetween saidflangesr The. rollers 30 are loosely mounted onupper andflower; shafts, .32 ,"securedfto the; sidefralnes 1.0.

ver 34 on a rock shaft 35, and the other sections are each connected by a link 36 to the other arm of said lever. A crank arm 87 is secured to the shaft and connected to a piston rod 38 carried by a piston in a steam cylinder 89 which constitutes a motor. The piston and steam cylinder and details are not shown in full, as they are such as are commonly employed on steam pumps.

A stepped movable feed slide 40 forms the bottom of a feed hopper 41 for each grate and is preferably secured to alternate grate sections by bolts 42 so as to move there with and opposite to the movement of the other grate sections. Instead of making one slide serve for each grate, stepped feed slides 40 may be connected to each grate section and move therewith, as shown in Fig. 6. The wall of the hopper adjacent the fire brick arch 43 is formed by plates 44 and 45 spaced apart to form an air space 45 between them to keep the outer plate 45 cool. These plates are secured together by providing spaced wedge lugs 46 on the plate 44 passing through openings 47 in the plate 45 with wedge blocks 46" between the lugs 46, the plate 45 having spacing lugs 48.

In order that the coal may be prevented from packing in the hopper and thereby interfering with its proper feed, an agitating mechanism is provided comprising an endless conveyor or impeller 49 formed of spaced rods 50 and chains 51, the latter being mounted on rollers 52 and drive sprockets 53. The shaft 53' carrying the sprockets 53 projects outside of the hopper and car ries a ratchet wheel 54 engaged by a spring pressed pawl 55 on a lever 56 rocked by the crank arm 37 through a link 57 The rocking of this lever 56 causes the pawl and ratchet mechanism associated therewith to give the shaft 53 an intermittent rotary movement so that the conveyor is given a step-by-step movement in a direction toward the interior of the furnace. This movement of the conveyor keeps the coal from packing and cooperates with the slide 40 in feeding the fuel to the grates.

A discharge opening 58 is provided be tween each slide 40 and the plate 45. With the machine in operation the coal is moved on each grate by the conveyor 49 and the slide 40 through the opening 58, the slide 40 moving downwardly with alternate grate sections as the other sections move upwardly, and this action serves to advance the fuel along the grates, the fresh-er fuel pushing the partially consumed fuel ahead of it. By the time a charge of fuel has reached the lower end of the grate it has been consumed and is dumped into the ashpit by means of dumping grates 59 and 60. The grate 59 is ivotally mounted at its rear end at 61 and tips upwardly to prevent fuel on the main grates from passing to the pit when the clinker or ash is discharged be tween this grate and the grate 60. It is tipped by means of a crank arm 62, l1nk 63 and lever 64 which engages a pin 65 with the grate is in its normal position and is moved to dotted line position by a pipe or other suitable device. The grate 1s pivotally mounted at its rear end at and connected to a toggle link 64, sald link being connected to a toggle link pivoted on the frame. A link 66 connectsthe links 64 and 65' with a lever 67 which in its normal position engages a stop 67. Then the lever 67 is thrown rearward the pivots of the toggle move out of line and the grate 60 moves to the dotted line pos1- tion shown in Fig. 4.

The columns 8 are made hollow and have inlets 68 in their lower ends communicating with blast air conduits 69 and outlets 70 at their upper ends communicating with an airboX 71 extending from the front plate 12 to a fixed frame member 7 2 upon which lower end of the grate sections slide, the plate 7 3 forming the bottom of the box being removable from the front of the furnace so as to prevent fine ashes from the grates collecting therein and for changing from forced to natural draft.

It is quite important to maintain the air pressure sufficient for proper combustion and in order that this pressure may be indicated an air pressure age 74 is mounted on the front plate and is provided with a tube 75, the inner end ofwhich extends into the region below the grates where combustion is taking place.

As the adjacent grate sections of each grate move in opposite direct-ions, the fuel on the grate sections is kept in a state of motion by this action, as well as by the incoming fuel pushing the older fuel ahead of it 'down the grate sect-ions.

The design of the air ports or holes 26 in the grate units may be of difierent shapes, as indicated in Fig. 2, where only the units of one grate section are shown in detail. The edges of the grate units are'preferably provided. with notches or recesses 76 forming air holes.

. I desire it to be understood that this invention is not to be limited to any specific form or arrangement of parts except in so far as such limitations are'specified in the claims.

What I claim as my invention is:

1. In a furnace, the combination of a hopper having a reciprocating bottom feed slide and a discharge opening adjacent thereto, a plurality of inclined reciprocable grate sections having their upper ends adja cent said discharge opening and connected to said feed slide to move therewith, an endless impeller disposed in said hopper with its lower run adjacent said feed Slide, and

means for imparting a step by step movement to the lower run of said, impeller toward said discharge opening and in syning a duct for blast air disposed beneath said sections and PIOVlClQCl' with an inclinedbottom closure plate ext-ending substantially the length of said sections and removable from the front of the furnace.

3. In a furnace, the combination, with in-;. clined supporting means, of a grate section comprising a grate supporting bar mov able on an incline on said supporting means, and a plurality of grate units detachably secured to said bar, the upper unit being of stepped formation and the other units being of longitudinally arched formation.

4. In a furnace, the combination of a hopper having a reciprocating bottom feed slide and a discharge opening adjacent thereto, a plurality of movable grate sections disposed and movable on an incline, means for moving adjacent grate sections in opposite direct-ions, said feed slide being connected to alternate grate sections to move therewith, an endless impeller disposed in said hopper with its lower run adjacent said feed slide, and means for imparting a step by-step movement to the lower run of said impeller in the direction of said delivery opening.

In testimony whereof, I aflix my signa-' ture.

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