US1202303A - Furnace. - Google Patents

Description

A. W. MOYER.

FURNACE.

APPLlcATaoN FILED DEC. a. 1915.

1,202,303. Patent-ed 0@t.24,1916

nains-sniff l.

FIGI

TURA/EY A. W. MUYEH.

FUHNACE.

APPLlcmoN FILED Dic. 3. 1915.

Patented Oct.. 24, 1916.

4 SHEETS-SHEET 2.

Wl TNESSES: IN1/EN TUR A. W. MOYEH.

FURNACE.

APPucArroN FILED nic. s. |915.

Patented Oct. 24, 1916.

4 SHEETSSHEET 3.

ALBERT W. MOYER, 0F NEW YORK,` N. Y.

FURNACE.

Specification of Letters Patent.

Patented Oct. 24, 1916.

Application filed December 3, 1915. Serial No. 64,814.

To allwlwm z't may concern:

Be it known that I, ALBERT lV. Moyen, a citizen of the United States of America, residing at New York city, New York, have invented a new and useful Furnace, of which the following is a specification.

My present invention relates particularly to heat treating furnaces for annealing, hardening. tempering and otherwise heat treating different articles.

A special object of my inventi.. is to secure substantially uniform and even heating of relatively large and bulky objects.

)ther objects are to conserve and prevent loss or waste of heat and to effectively control the heat.

These objects I have attained by constructing my furnace with a heating cha1nber, a combustion chamber above the heating chamber and separated from the heating chamber by a substantially horizontal imperforate wall, and by conducting the heat from the combustion chamber downwardly around the separating wall and into the heating chamber beneath said imperforate wall.; The Waste heat is led off from the heating chamber through exhaust flues and the iiow of heat through the heating chamber is so governed as to produce practically uniform heating effect throughout the chamber'. In a preferred construction the heat conducting fines open into the heating chamber at different elevations, and the flues are proportioned in Size according to their distance from the source of heat. The heat is preferably supplied by burners discharging into the opposite sides of the combustion chamber, and the various fines are preferably formed as passages in the side walls of the furnace body.

Various other features and the details of construction, will appear as the specification proceeds.

ln the accompanying drawings, I have illustrated my invention embodied in a preferred form and in a slightly modified form, but it will be understood that other changes and modifications may be made Without departing from the truespirit and scope of the invention.

In the drawings: Figure 1 is ii. transverse sectional view of a car type or movable hearth furnace embodying myinvention. Fig. 2 is a longitudinal sectional view of the same. Fig. 3 is a transverse sectional view similar to Fig. 1 of a slightly modified form of the invention. Fig. 4 is a longitudinal sectional view of the second form. i

In. the illustration, the combustion charliher is designated 7, and the heating or treating chamber is designated chamber-,being located above the heating chamber and separated therefrom by a substantiall y horizontally disposed imperforate wall l). The furnace is usually constructed with side walls 10 connected at the top by a top wall 1l, which forms the roof to the combustion chamber, and the imperforate chamber defining wall 9 is preferably in the form of an arch connecting the two side walls, as indicated. The heating chamber is made relatively high to accommodate tall or bulky pieces of work, such as boxes of articles to be annealed. sheet metal, and the like. The heat is preferably supplied by gas or oil burners, such as those indicated at 15. discharging in through openings 16 in the side walls into opposite sides of the combustion chamber. The heat products are conducted from the. combustion chamber around thel iniperforate separating wall and. into the heating chamber by fines consisting in the illustration, of vertical passages 17 formed in the side walls communicating at their upper ends by lateral passages 18 with the combustion chamber, and at the lower ends by lateral passages 1D with the heating chamber. In the first form of the invention illustrated, a. plurality of these branch passages lil-opening into the heating chamber are provided for each vertical heat conducting flue 17, and the cross sectional area of the branch passages is proportioned according' to the distance of such passages from the source of heat. Thus, as illustrated. the branch passage 19 nearest the con'ibnstion chamber is made relatively small, and the passares farther away are made gradually larger. In this way a. substantially uniform How of heat through the several passages .is assured. The heat is preferably introduced into the heating chamber at both sides thereof, thc inlet passages at the opposite sides being preferably arranged in alternating relation, as indicated in Fig. 1, where the black arrows indicate the ilov of heat entering at the left, and the dotted line arrows indicate the heat entering .from the inlets att the right, which, as indicated by the dotted lines, lie iu,` a plane beyond that of the inlets at the left. Where, as in the illustration, burners are 8, the combustion provided discharging into the opposite sides of the combustion chamber, the burners at opposite sides are offset from each other so that the iow of one burner will not oppose the fiow of the burner at the opposite side, and furthermore, the entrances 18 to the heat conducting filles 17, are preferably cach located substantially opposite the burner at the opposite side, as shown in Fig. 1. Baflles 20 are. preferably provided opposite the burner openings to break up the blast from thd burner, thereby insuring proper combustion, and to deflect the flame somewhat so as to revent its passage straight across the combustion chamber and out before combustion can take place. From the heating chamber the waste products are led off through exit or outlet fines consisting in the present disclosure of downwardly extending passages 22 formed in the side walls communicating at the bottom with outlet conduits 23 leading to a stack 24 at the back of the furnace. In the form of the invention illustrated in Figsl 1v and 2, these outlet iues extend from the bottom of the heating chamber, communicating with the lower portion of the heating chamber by lateral passages 25.

In the form of my invention illustrated in Figs. 3 and 4, instead of entering the heat into the heating chamber at different levels, the heat is all entered at the bottom of the chamber, and passes out of the chamber through exits provided in the top of the chamber. Here the downwardly extending heat conducting passages 17 each hav'e an outlet 19 opening into the bottom portion of the heating chamber, and the waste products escape from the upper portion of the heating chamber through outlets 27 opening into downwardly extending flues 22 leading to the outlet conduits 23. This construction also forces the heat to traverse thc entire heating chamber so as to heat it substantially uniformly throughout, and the Crossfire of infiowing heat streams, as indicated by the arrows, prevents the formation of any pockets or dead areas.

The degree of heat is governed by means of the burners, and valves may be provided for controlling the flow of heat. Thus, in the illustration valves are shown at 30 for controlling flow through the exit flues. A further control may be exercised by means of a relief damper 31 in the exhaust stack 24. Opening this check damper reduces the draw of the stack on the outlet flues and so checks the outflow of the heat products.

To prevent loss of 'heat by radiation, the furnace Walls are preferably covered with an external layer 33 of thermal insulating material. I find porous insulating brick to be an excellent material for this purpose.

The furnaces illustrated are of the carbottom type, but it will be clear that the invention is equally well adapted to a furnace of the stationary hearth type. The hearth, which in this case is in the form of a platform mounted on a car truck is designated 35, and the car truck which mounts it is designated 36.

The furnaces shown are of single ended construction, having a door B8 only at om end, the opposite end being in the form of solid wall 39. To prevent loss of heai around the edges of the door I preferably provide a seal in the form of a rearwardly extending down-turned flange 40 on the upper edge of the door which dips into a sealing groove 41 on the front of the furnace over the door-way therein, and a dependent ange 42 on the lower edge of the door engaglng in a sealing pocket provided by the channel or angle iron 43 on the outer end Aof the car. These sealing grooves or channels support a suitable sealing medium, such as sand or the like. In the car-bottom type of furnace the edges of the car-bottom are preferably sealed by providing sealing channels 44 along the sides of the car into which flanges 45 at the sides of the furnace dip, and a sealing channel 46 on the forward or innermost end of the car over which engages a shelf 47 on the rear Wall 39 of the furnace.

From the foregoing it will be seen that the exceptional height given to the heating chamber adapts the furnace to the treatment of relatively tall and large objects, and the distribution of the heat through the heating chamber in the manner illustrated, produces a substantially even heating throughout such objects. The imperforate division wall between the combustion chamber and heating chamber in addition to its separating function, performs the additional function of transmitting heat to the heating chamber by radiation.

lVhat I claim is:

1.4 An over fired heat treating furnace comprising a furnace body having side walls connected by a top wall, a substantially horizontal imperforate wall extending across between the side walls and separating the in terior of the furnace body into an upper combustion chamber and a lower heating chamber, heat conducting flues extending from the combustion chamber down through one of the sido Walls and into the heating chamber beneath tbc impor-forato separating wall. exit (lues leading out from the heating chamber for carrying away the waste products, and a burner discharging into the combustion chamber.

t2. An over fired heat treating furnace comprising a furnace body having side walls connected by a top wall, a substantially horizontal imperforate wall extending across between said side walls and separating the interior of the furnace 4st'fintially horizontal iinpeifoi'zite will below the iinpiirfoi'nti: scpnmting wnlh sind side walls l'intlifi having exit passages formell therein nimmiinicziliing with the huntingchiiniliiei'.

3. An ovvi' l'iiizl lient` comprising ai fiiinnic hmly bring :i limiting; cliziinheriinrl :i nennhnstion chamber :ibnvu sniil limiting izhiiinhi', :i substantially li ii- Zonta! iiiiiiifil'nrzillii wzill separating iin' henting chamber from the umnhnstion cliziznbm'` :i burner ilinvhsirg'ing into the ifinnliiisliiin chamber Anil lient conducting liicgav in mmniiiniirzitimi with tlm rfmnbiinliiin chiinibvr uxtiiniling Into thv. lil-:icing ulniinher lil, points beneath thu` iiiiiiarl'in'nm svpni'ziiinsj will, Sziiil lines \':ii' Vin, n iii cross .Lseiztiiiniil :iiiii sirifnriling tu thel illsfnnw :iiiny 'Flinn lii Muir-:riol lient lo tlnfiiby equalize the: limi." if liirni into the4 ilillei'ii'nt portions; 0l liln"v healing chamber.

4. In Conibiiniliiin, ii furniifa bnilj: lniifnif :i heating Lhriinlinr therein nini ii `Jainihiirf'iimi i-liainbor ahorn Said heating.: Chamber, ai Sinh- Sepiv rating the limiting Chamber from the crinibiistion nhziinher, ai, burner discharging into one side of the Comblislion Chzimlivr, a limit conducting line extending finm the opposite, side of the cmnhiistion clinmhiii' siihslmitiii lly opposite the point (if discharge of the hinni' into the uhznnlier, Said heizt cnnilinrting llinixtending downwardly anfl inn thi heur 'Mig chamber below the!iinperlm'ne sqnirfilf ing Wall, and nn outlet llue ixliinilingr f inin the heating chamber in :i pluim siiliiiinrilinlly eating 'Furnace apposite 'thu plinio of iinti'y of the lient m- 'diluting fluff thereinlo.

5. In cmnbinfition` zi iciirnnrzvy bofly having :i heating ihnniher thm-0in :incl :i combustion wlnnnhier :ihin'n siiil limitingr chamber, d silhslnntizilly hiirimntzil iinpnrfornte wnll 50pm milling the` hunting clianihir funn thv, rombiisiiiiin chain'ibrn, n liiii'nei' discharging intr the Cmnlnistirin iflniinbfri", ai heut. conrliivl'irig lliii: 00mmiinimlingr :it its upper unil with thv` minlnlSliun vhnmher und extending ilnwn iif'fiiwlly hiilmv the impeifm'zite Separating wzill, Hniil liiii having :i plurality of' inlits mening :il ilillerinl` levels into the limiting ilmn'iboi' liehiw the iinperfiirzito wnll. the inhilis nl lh@ higher lvvels; living smaller than thi'ise :it the lower levels to thorcliy substrinlhilly eifiinlizi, the flow nl limit into the limiting clninilwr ,inil exit Hilos leziiling nfl' fiiini tbl: limiting chuinbir.

il, xi Ti min' firiwl honi', fruiting finiiiicf: 'minimising :i` l'innziiilinily hniing :i rehiiiii'frlv high inentingr ilimnlier lo receive mill ibjrinj find :i rinnbiistiiiin Cinnnhcr :ilini'u mid limiting clnin'ilior, liiii'niI-S discharging intr the iifiinhiistimi ulizimliiii, n Snhtiintizilly liiiriziiiitzil iinpurfinzite will silliaiisili'iig the healing' irliiiii'ibiri from (he i'iiniliiigtion rliarnlivr, :mil inni-filling limit tu Tho upper prirtions nl uhjiff't's in the limiting Chzimhnr wlifilly hy riiiliiiliion, hea@ conducting fines extending fifnn lli@ icon'ibiisticm chamber :irniiiifl the iini'wrfni'ziti, Separating wall sind intr; ihn limiting` (-liiimbcr beneath Siiiil wiill, :mil 0xff` lines extending funn planes in the hvnliniij illirinihiw niilistniil'izilly oppositie thu whims nl vnlijy nl' thiI l uit cnniliicting lilies lilimi-inlri lli Lherilliy unipol :i flow 01' lient lhrmiglniiil ther hauling' i'lniinbm,

A L l i ERT XV. M YER.

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