US1996660A - Gas fired furnace - Google Patents

Description

4 Sheets-Sheet 2 7. H. CLEGG U; STmwn RTH INVENTORS GAS FIRED FURNACE Filed Bed. 8, 1954 S. STANWORTH El AL April 2; 1935.

April s. STANWORTH ET AL 1,996,660

GAS FIRED FURNACE Filed Dec. 8, 1934 4 Sheets-Sheet 3 o U 1 f 5 (L611 2 6 d l 4 f A 9 o C1 3.5rnuwom U; H-CLEGG TS'rmvworm I NV EN TORS Patented Apr. 2, 1935 Stephen Stanworth," Burhli, He hei t Clegg, Southport, and James Stanwpl th, Burn- J Appl es-flan December- 8,

H 'I'hisinventioni elates to' a gas: firedjcrucible and like furnace that is applicable to; the melting; o r heating 56f metals; .or maintaining them in a m Iten "or he'a'ted condition; ,or. n me heating 5 of other substances" or naterials'and hasicrj its obj ect T to" introduce an improved ccnstructicn V which will be more economical, jtheuse of gas and. less "injurieus to refractory linings," and, to crucibles 'c'r receptacles when used, whilst maintaining a high 01" increased'state (if efficiency. In'fthe accompanying drawixigs'z-g 1 Fig. a sectiona1, e1evaticn 1 f a; gas'fii'e'd. crucible furnace constructed inac'coidance with thisinvention. .7 j ,f Fig.2. is a sectional, plan taken'on line if-1 2 .Qf-Figl 1. 1 Fig.3 asecticnal elevation taken on line 3-3 c ms-' I i I Fig; W, is" a sectional aw-ano taken On line flldgqf Q Z "j; 'g'f, isjasimil'ai" viewtqiFigJl showing ;a "modified, ebn'structibn accordance 1 with this invention for use asgai g'asfired ladling furnace.

nFigLQG isafsectienal'plan taken on line 6-5 6 'of'Figspn I w J r FigJf'? is a sectional elevatidn taken v on line flg'lfjoi Fig; 6,'andl ;f i v j a Fig. 8 a secticnahelevaticn taken cn linle -8'cf Fig 6; In the icb'nstruc'tion shown in Figs. 1 to 4 the 'iurnace comprises .a cylindrical casingflgA that 1 flanged" inwardly at La; for ,connectic'n with E1! bottom plate A and flanged butwardlyj at, a? ffci v ticnnecticn 'fwith an an ular" "top plate A 1 "Resting on the bottom plate A and secur 'ed "uetween the"; lattei and the internal flange a ma ring'fBfofheatinsulajting imperial amir'e se ing "bnj'such'ring' a e two rings. C; C v Qfjrefrac toi'y material. Fitting within' 'the rin Bfofhat. insulating. material is a .disc or "packing "ring iB of'fheat insulating Ii1'ateria1"ang1'restingcn such disc of' packing is an in ner iin'gf 10 m fe- Tfractoryinateriali The' upper parti'df the ,fi YC is bf increased internal diametei'T-asshown atj ,c 5 5 and extending around. the top cfgthe'fring :C? 4 isa shoulder c wh'ich cc'me's'flevel with thetcp .oi' the "ring Cl and, with 'alshouldeif 1: formed. in "thef'iingq: Restingcn the'top e fthering C? cislaf-l ing C? -cf refractory FinateriaIIaIid jbn lthe 'tdp'bf the? latter is 1a a 0 whli'h extends to .the top of vlthe furnace. Resting on theffiat surface formed by. the Hip offthe ring'jcl fand shouldersflc c is a ring Cof refractory materiai which. made/bf such. av thickness as to a a efa v have? m ne 219???- in sections 'raised seating or stand fe fora crucible F t0- rest 1934, smm zamsg f tr'allydi spcsd I V is constifucted 'frcm fcarhoi'undum and is'made ins'ecticns withtongued-and gr'oove d jcints d that 'a'i'esea'1ed- -with;cement, Resting an the top-0f the'fcarbcruhdumiing' Dandbn the-"tap of the ring- (3 isa ring'c of refractory mater al; f;

A gas tight joint may be madebetween thefririg I D and; the rings] (3 C bymeans'oi cement, The top of-"the ring G is reduced in diameterff tc pass through a hole in the "top plate 'A Qand 10 leave V aspace for a packing'BP fjheat'insuiat ing material 'which extends between ,the ring a Ci, tQb-P18tEA and metal-casing "A and seals the -joints between-the'qfings C, 0 ,0 C when R the 'tcp pfate isi belted c1" "otherwise: secured to '15 the teas-mg A l Each df the iings ditoc in clusivemay be made in one piece, offbe built'up f infthe manner described.formaLcylindrical chanrif ber that is fittedwith anouter mungmean 20.7

inner lining E constructed from refractofry ma; te'ri2'i1; -"either-01*beth of which'are removableand renewab1e.- 'I'he=- inner lining? cdnstitutes the cntraIPheatin'gchambenand is formefwith a 25 upo 'I'he to'pi of' th e-"central' heating chamber is-clos'ed bya lid comprising a disc G constructed f oni onecr jmdre pieces ofrefractory material 'fixed. withina metal can G andseparated"from the latter by hea't ins'ulatihg m tenalje This lid is suspendedby a link "H which passes through a slot in an arm J and-:is fitted above the latter with a. handlever h'fcnnedwith twceccentrics h t for raisingv-or lewei ing the lid.- The a'rn'i J is 'fixedion a; ve'rtical shaft y that is free to turn in two bearings suchsas'iy' fixed" to the casing Aatthe; top: and bottom'.; -With this construction I atherlid-can bes'lifted andmoved to a position 1 atone. side'of the. centraliheating 'chamberh It camalso be 'moved to: occupy a-- position ,directly over the heating chamber. and loweredluntiiit rests-Ton the ring CFand plateuA in which position a tight joint may be' made between ,the"1at+ lter andthe, 1id;by;a. packing ring G Referring m ;-B.; ns L-Ki d tQS a i i duct n pas sage that extenqs frqnitheucasinghfiq the bottom. of the central heating chamher andenisi t la stan i d re on 1 puter end .of the; induction-passage) is closed by" a plat'e'L inwhichlis fitted a-gas burner Mand. 59

beicw thelattera iusihle'sealN. I The gas burner M has a; ebnica1 ibtife Iof 1'afg 1adua1 tape; that Y at. H h Vel I .K I i causes the 7 gas imt' siw b 'a'n e m w mine jan aror ciinon the ang e? i'sjzfingib that 7 1 a; closedjoint between such "parts and withthe box-Q.

carborundum ring jD.' At the other side of the block} is an exhaustpassage O? which enters-'- plateA is bolted, or otherwise secured to the "casing A. Each of therin'gs C to C inclusive -may'be.made in one piece, or be built up in sec- ,tionsl' U' indicates a pot for receiving the metal a metal box ,Q, Figs. 1 and 2. This -.m}etal. box

is formed on its outer surface with radiating ribs or gills q and'is connected egalitarianassage q with a fiueB which may-take the'formcf-an upright pipe of any suitable length and be fitted with a valve or damper R ifor. iiegulatingethe draught. The metal box Q is situated within-ani air inlet chamber S which is'jacketed with heat insulating material s and communicates' 'witii i t p f h po is sealed by a packing an annular air passage ;T by means} of I a branch passage Tl" that: is situated-at one side ofifthe' block P. At= the othersi-de of the latter is Ia downtakeithat leads totheair induction pas sage K. e The gas burner'M isconnected' with a.

gas supply pipe in that passes through the metal Referring ten; 4 when thefgasiis turnedlon -and lit atthe burner nozzle M it issues at a' high 'velocity and burns .at'the mouthh flthe no'zzle'withoutlpre-admixture with; air and con tinues to burn;in the induction tube and .inthe central heatingeehambeit. It also induees air I into the passage through the downtake T annular passage T branch passage T i-and air}in-' take at the bottom of the airinlet chamber- 5. Wa e r c inu to u n in henassase Y K fand in thefcentral heating cham ber; ,the prod-- V ucts of combustionfrorn, which escape through V the passage 0 and circulate round the annular passage Q therebyheating the carborundum wall D which then acts as a recuperator tqp ieheat the incoming air as it travels around thean- 1 Passage T t he nd s iQn Pas as After the products of combustibmhave: passed round the annular passage- Q theyescapethrough f thepassage 0 into the metal box Q therebyheating the latter and causingEit to -actlaS; e-Eecond recuperate; for preheating the incoming air which enters :the air inlet chamber s ar'pund the metal box Q.; When the latter, has become" heated it also heats the gasin its passagelthrough the pipe m to the burner-nozzle Mj and i when? the furnace has been in operation fora short time the flue R creates ia-sumcient draught to supply the air that necessary forcombustiont': 3:1: 1.

If-the, crucible, F cracks. and allows the metal to run into the central heating chamber,- "it passes. along the induction: tube K, melts the fusible seal N and drains ofi without interfering with the supply of gas or it's-combustion continued'to the top'of the: easing-A, on his lining is laid a; circular slabC bf reiractoryiimaterial and placed on the latter is afring' C of reifractory material.- 'Ihis'ring is; followed by; a

[ring C 'both of which are shaped substantially:as

' shown in the drawings. sfurreundingthez rings c 0' is a ring on that rests'on-the heat insulat 'ing material and-covers the joint between the rings C C Placed concentrically on the ring C is a carborundum ring D that, comes level with the top of the ring C and resting on the top of the latterand on the topof the carborundum ring D and on a portion of the heat insulating lining B is a ring C A gas tight joint may be made between the ring D and thering'C C by means of cement. The "heat insulating lining is continued over the top of the ring C and makes aLgas tight joint with the latter when the top and in theconstruction shown the mouth of the potis surrounded by a flange 11. which rests on a packing 'ri'ng u that is placed on the top of the ring C and prevents the admission of air at this atus. function infthe same manner as that described with reference to Figsl to 4 and in either forrn'of apparatus forced draught may be used instead of natural draught. ,Owing to the fact that the gas,.and jair are not mixed before they are lighted, "a much'mo'r'e gentlejflame is obtained which does not cut the crucible pot; or lining and they have alonger life than is'usual' in this class 'offurnace. v t I V Whatweclaim as our invention and'desir'e to secure by LettersPatent-in the United States i 1. Ina gas fired furnace, thecombination of'a central heating chamber, an air induction passage communicating therewith, a gas burner nozzle situated in'said air induction passage, an annular .e

passage surrounding the central heating chamber, alcircular carborundum partition arranged 'coiicehtricallyfin the annular passage andseparatin'gfthe' glatter "into an lnner'annular passage and an outer annular passage, a port'leadingv-rrom the centralheating chamber to the inner annular passage; a block extending cross the inner annular passage at, one side of said port; a box mounted outside the furnace, a; flue" connected with said sage to saidpomfsaid port being placedat the 7 box, a port leading from the inner annular pasother side'of the block in the inner annular passage, an air inlet chamber'mounted over said box and having'an opening for an airiintake; a port 'leadingifrom said air inlet chamberto'theouter annularpassage, a block extending acro'sssaid passage at one side of the port, a port'leading from the outer annular "passage to the an induction {passage and means for closing the central heatingehamber; V v, i i 2. Ina'gas firedafurnace; the combination'o! a The n i n Shown n s we e circular metaleasm a lining of heat insulating similar to that described with rerer'ence te Figs.

'material covering the bottom of the casing, rings oi refractory material arranged concentrically withinflthe'cas'ing; a centralheating chamber en- (7.

circled byesaid rings; acarbojrundum ring supthe passage or products of combustion fr'om'the central heating" chamber and an outerfannular eham berior the preheating of air, an external recuperator connected-with'the inner annular c5 7 ported betweenpertain of said rings and .far- .rangfedto form anxinner annuIar'ch'amber for port connecting said chamber with the outer annularr chamber, an air induction passage leading to the central heating chamber, a port connecting the air induction passage 'with the outer annular chamber, a high velocity gas burner situated in the air induction passage, and a gas supply pipe connected with the burner and passing through the external recuperator on its passage to the gas burner. I

3. In a gas fired furnace, a casing, alining of heat insulating material adjacent thereto, a central heating chamber having a wall of refractory heat insulatingmaterial spaced from said lining to provide a passage surrounding the heating chamber, a partition dividing said passage into two noncommunicating conduits, said partition being'of refractory material having a high degree of heat radiation, and said conduits being ar-c ranged respectively to carry in opposite directions the products of combustion: fromgthe heating chamber and air to be preheated.

STEPHEN STANW'ORTH. JAMES, HERBERT CLEGG, JAMES STANWOR'I'I-I.

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