US1996058A - Furnace fire box and arch structure - Google Patents

Description

April 2, 1935. J C CHAPPLE 1,996,058

FURNACE FIRE BOX AND ARCH STRUCTURE Filed May 29, 1931 2 Sheets-Sheet 1 1 INVENTOR.

K/ W M TTONEY April 2, 1935. .1. c. CHAPPLE' V FURNACE FIRE EOX-AND ARCH STRUCTURE' Filed May 29, 1931 2 Sheets-Sheet 2 INVENTOR. I [fidfifi/c f.- M

Jda ATTORNEY I Patented Apr. 2, 1935 UNITED FURNACE FIRE Box'AND anon STRUCTURE John 0. iChapple, St. Louis, Mo. 7 ,7 Application May 29, 1931,- Serial No. 540,948 sloiaims. (or. 122- 68) spect is more particularly characterized by an improved type of watercirculating element ,extending through the fire box upon which the arch is supported so constructed as to obviate the formation of steam holding or retaining pockets.

It is also another object of the invention to provide the firebox with one or more siphons extending between the throat sheet and crown sheet thereof and water circulating means connecting the rear ends of the siphons with the fire door sheet. I I A further object of the invention in one form thereof resides in the --provision of an auxiliary arch supported upon'the water circulating tubes in rearwardly spaced relationto the main arch for the purpose of retarding the :flow of the prodnets of combustion rearwardly above said main arch thereby obtaining a comparatively .pro longed heating effect uponthe fire door sheet and crown sheet of the firebox.

With the above and other objects in view, the invention consists in the improved furnace fire box and arch structure as will be hereinafter more fully described, illustrated in the accompanying drawings, and subsequently incorporated in the subjoined claims.

In the drawings, wherein I have disclosedtwo simple andpractical embodiments of the essential features of my improvements, in which similar reference characters designate corresponding parts throughout the -severalviews,,

Fig. l. is a vertical section through alocomotive fire box, this viewbeing taken on theline I-! of Fig. 2, and illustrating the application of the arch structure to an alternating arrangement of water circulating tubes and siphons;

Fig. 2 is a sectional view taken substantially 0n the line 2--2 'of'Fig'. 1, the ends ofthe-arch tubes and the fire'boxwall being shown in elevation;

Fig.3 is a vertical rsection taken substantially onithe line :3.-*-;3 of Fig. .4, showing anotherl em- .wlihbodimentof theinvention; i.

. i Fig. 4 is a vertical sectionalview taken onthe line 4 -l of Fig. 3, theends of the arch tubes .and the firebox wall being shown inelevation, and

Fig. 5 is a detail perspectiveview of one of the spacer brick used in the auxiliary arch shown .inFig.3.- v

Modern high powered locomotives are provided with boiler fire boxes of appreciably-greater length than those heretofore used instandard locomotive boiler construction, and ifthe con-1 ventionaltypeof arch-isproportionately extend-- edrearwardly towards the firebox doorsheehthe space between the top of the arch and thec'rown sheet is too greatly restricted. If'the comparatively short arch is used, the products of' .combustion pass over the rear end of the archfor- Wardly to the boiler ,fl'ues togetherQwith considerable fineooal uni'gnitedoronIY partially co'ntsu-med .and are not brought into contact-with the l fire door sheet and rear portionsof the side sheets. a and crown sheet of the fire box. This results inadequate steam production and uneconomical consumption of fuel. Ina co-pendi-ng application for patentfiled of even .dateherewith, ,I have disclosed an improved arch structure for uselin connection with relatively long fire boxes having its upper rear end embodying means .fordeflecting the products ofcombustion downwardly towards the fuel bed and in contact with the rear side sheets, fire door sheet and C10WIfl She ellq-Qf v the fire box and which obviates undue .restriction of the space between the top of the archand the crown sheet. :In order to enablelthi s arch to-be used in conjunctionwith water circulatingitubes and siphons of ,conventional form, I have dis- 735 closed in said application, refractory tile or brick constituting the upper end of the arch of a certain novel form and-construction- ,I propose, by means of mypresent invention to accomplish this same general result with ,the use of an arch composed Wholly .of refractory bricks j or units of standard form. g

In the drawings wherein Ihave illustrated-the essential featureof my invention-as applied-to a locomotive fire box, 5 designates the fire door sheet at the rear end of the fire box, 6 the flue sheet at the forward end thereof, 8 the crown sheet, and 9 the throat sheet extending u downwar dly from the flue sheet in rearwardly ofiset relation thereto. In these respects, the boiler 5 o fire box is of conventional form, and it will there fore, foe understood that the boilerwater sur: rounds and is in direct contact with theaQflter surfaces of these metal walls orsheetsof; the fire obliquely inclined water circulating tubesextendlongitudinally through the fire box fromthe throat sheet Qtothe fire door sheet 5, As herein 7 shown, each of these tubes includes a rear section- I0 opening'at its lower end through the throat sheet 9, said tube section having a lower portion 10f somewhat'greater radius than the upper portion thereof to provide longitudinally extending shoulders II oneach side of said tube section.

The upper end of the tube section I llon its lower. side, is longitudinally curved as indicated at I2, the shoulders I I extending throughout this curved part of the tube in concentric relation thereto. Thejupper portion of the tube at this curvedsection I2 graduallym'ergesinto the vertically elon jgatedorrfiattened upper section of the tube' which opens at its upper end: throughthe fire doorsheet 5 adjacent tothe'crownsheet'fl. The walls :of the lower curved portion J2 o f'the"tube* land the shoulders. I I are gradually merged into the opposite side walls of'the flattened tubesections I3 so as to avoidithe'forrnation of, internal stearn holding or retainingpockets in the tube wallsp a H "In' Figs; *1 and-2 of the-drawings; I have shown vertically disposed siphons I6 within thefire box alternately arranged with respect to'the watercir'cul atinlg tubes of the form above described.

,"These 'siphons have: upper longitudinally elongated portions whichopen through the crown sheet 18, andatthei'r lowergends are provided with "forwardly andfdo'wnwardly, extending tubular ofthesiphons, the lower ends thereof are of the V I same cross'sectional form and are longitudinally k V a v :tubes, as will be evident from reference to the drawings. H'I'helo'wer portion of the siphon and portions opening through! the throat sheet 9. These tubularjportions are of the same crosssec- "'tional'formas the portions I0 of the water-circulating tubes and disposed in the same plane therewith; Also above these tubular extensions curve'd'in the same manner as the parts I2 of the 'itsl forward tubular extension are provided with shouldersII' on opposite sides thereof to receive and support one end of the arch bricks- I4 which extend between the siphon and water-circulatingtubes; V I

Thus it will be seen that a series ofv alternating the adjacent water circulating tubes and siphons in any desired number may be arranged in transversely spaced relation through the fire box and uponthe shoulders II and" I-I- of these spaced tubes and siphons, respectively,'the arch forming brick *or tile of refractory material indicated at I4 bee ingisupported-at theiropposite ends, thus pre- -venting"the direct passage of the products of combustion upwardly between the tubes and siphons in thisportion of the firebox and causing the same to flow longitudinally along and in contact with said tubes and siphons in the rear'ends. of the arch-wall. The brick I4 are I ,of'a standard formwidely'used in such locomo tive arches; having upper and lower 'c'urved surfaces with the lower concave surfacesjthereof 'opposedto'the fuel bed. As seenin Figs. land 2 of Y the drawings; by reason of the curvedrear end portions of the shoulders'II and II" of the V supporting tubes and siphons, the brick forming therear end of the arch wall will besuccess'ively supported at different angles and together, form "a"rearwardly extending downwardly curved'or inclined deflecting section so that the gases and f products of combustion will bedirected by said upper end of the arch wall, rearwardly and downwardly towards the fuel bed and interimtact with thefire door sheet 5. Any solid fine I particles of fuel carried in suspension by the gases are thus returned to the jzone of intense heat where they will'be ignited. Thus, by causing the. products of combustion to directly contact with andfiow upwardly along the firedoor sheet 5', a maximum percentage of the heat units will be utilized in the conversion of the water into steam; Also, the products of combustion ar thereby caused toicomef into;direct contact with the rearend portion of. the crown sheet. 8, with the elongated 'portionsofthe siphons, and

as well with the portions I3 of the water circulating tubesha'vinga relatively extensive wall area. This further increases the maximum extraction of heat from the burning gases and the generation of steam in the boiler.

While anypreferred' means may be provided for the purpose of retaining the rear downward- .ly inclined; brick I4.of the arch upon the sup portingshoulders IIfand ll,for thispurpose I prefer to 'weld' or otherwise permanently secure to the opposite sidesor the watercirculating tubes and-siphons the short lugs or trunnions indicated at I5 which effectively prevent thej rearwardsliding movement of the fire brick."

in Figs. 3 and 4 of the drawings, Ihaveshown an'auxiliary rear arch spaced. from .the main arch wall For the purpose of supporting this auxiliary arch in position; the side walls of the flattenedsections I3 of the water, circulating tubes are formed withoutwardly struck ribsgindicated at H which are inclined downwardly and rearwardly across'said tubes'towards the fire door sheet. 5. The rear ends of 'thesiph'ons I6 relation to the ribs I1 and are suitably connected fwith the rear endfwallsof thesiphons and the fire door sheet 5. "Upon these tubes I8 and} the ribs I! of the adjacent main. arch supporting tubesthe opposite ends oftherefractory brick .or'tile IQ-are supported. Th'ese brick-maybe of the same standard form asthebrick I4 con-1 stitutingthe main arch. The rear-brick I9 are spaced from the fire door sheet '5aby means of suitable spacer brick indicated at 20,which' are arranged on the tubes I8,'thu s'providing open- 35 are connected by water circulating means with the fire door sheet 5, and in this instance, this 7 Water circulating means is in the form of the tubes I8 which extend substantially in parallel 0 ings between. the "rear end :of the'arch formed by the brick IQ -and the fire door, sheet. These spacer brick'may be of any suitable length as' circumstances or conditions mayrequire; I In thislast described form of the invention,

it will be understood that after the products of combustion are directed rearwardly andfdow'n- Wardly bythe upper endof the main arch wall.

against the fire door sheet, their upward course of flow along the fire door sheet will be retarded by the auxiliary arch wall composedof the bricks I9, thussecuring a very intensive concentrated heating effect 'upon the firedoorsheet 5. The products of combustion pass at relativelylow velocity upwardly throughthe spaces in the auxil iary arch'formedlby the spacer brick 20 and into contact with the rear end ofthe crown sheet Where further heat. isextracted therefrom b efore the evaporation of the boiler water. Also by the provisionjof the tubular water "circulating 'connections between the fire door sheet and'the rear endsof the siphon' s'. I6, better and freer circulation of the water through the siphons is. obtained "the auxiliary arch and the fire door sheet providcombustion is deflected into contact with the rear fire door sheet, it will be understood that this feature isnot herein broadlyclaimed the principal feature of novelty in my present invention, residing in the novel construction of the water circulating tubes and siphons, whereby the ad- 1 vantages of the invention disclosed in my oopending application may be obtained with the use ofarch wall brick of ordinary standard form throughout the structure of the arch.

I have herein shown several embodiments of the essential features of my invention, but it is to be understood that the same might also be incorporated in various other alternative structural forms, and I accordingly reserve the privilege of adopting all such legitimate changes therein as may be fairly incorporated within the spirit and scope of the invention as claimed.

' I claim:

1. In a locomotive boiler furnace, transversely spaced water circulating elements having parts longitudinally inclined upwardly from the fire box throat sheet, an arch wall composed of refractorybrick, and said parts of the water circulating elements at each side thereof being formed with longitudinally extending supporting shoulders for the arch brick having their upper end portions downwardly curved towards the fuel bed, an auxiliary arch wall above and in rearwardly spaced relation from said first named arch wall, and means associated with said water circulating elements supporting said auxiliary arch wall in a longitudinally inclined position extending rearwardly and downwardly towards the door sheet of the fire box.

2. In a locomotive boiler furnace, transversely spaced water circulating elements'having parts longitudinally inclined upwardly from the fire box throat sheet, an arch wall composed of refractory brick,-and said parts of the water circulating elements at each side thereof being formed with longitudinally extending supporting shoulders for the arch brick having'their upper end portions downwardly curved towards the fuel bed, an auxiliary arch wall above and in rearwardly spaced relation from said first named arch wall, means associated with said water circulating elements supporting said auxiliary arch wall in a longitudinaly inclined position extending rearwardly and downwardly towards the door sheet of the fire box, and spacer brick interposed between ing passages for the upward fiow of the products of combustion in contact with the upper end of said door sheet and the rear end of the crown sheet of the firebox.

3. In combination with a locomotive boiler fire box and transversely spaced water circulating elements extending through said fire box, said elements including siphons connected with the fire box throat sheet and the crown sheet and terminating at their rear ends in spaced relation from the door sheet of the fire box, a main arch wall supported by said elements extending upwardly from the throat sheet and terminating in spaced relation from the rear ends of the siphons, and an auxiliary arch wall and supporting means therefor connecting the rear ends of the siphons with the fire box door sheet, said latter arch wall being disposed above and in rearwardly spaced relation from said main arch wall.

4. In combination with a locomotive boiler fire box and transversely spaced water circulat-.

ing elements extending through said fire box, said elements including siphons connected with the fire box throat sheet and the crown sheet and terminating at their rear ends in spaced relation from the door sheet of the fire box, a mainarch' wall supported by said elements extending upwardly from the throat sheet and terminating in spaced relation from the rear ends of the siphons, water circulating tubular connections between the,

rear ends of the siphons and the door sheet of the fire box, other water circulating elements extending rearwardly of the siphons and connected with said door sheet, and an auxiliary arch wall supported by the latter elements and said tubular connections above and in rearwardly spaced relation from the main arch wall.

5. In a locomotive. boiler furnace which ineludes transversely spaced water circulatingelements inclined in the direction of their length upwardly and forwardly toward the fire box door sheet from the fire box throat sheet, shoulders formed on saidelements in the direction of the length thereof from said throat sheet and having their upper front end portions curved downwardly toward the fire box fuel bed, an arch wall composed of refractory brick supported on said shoulders including the downwardly curved end.

portions thereof, extensions on certain of said elements extending upwardly to the fire box crown sheet, their rear ends spaced a distance from the fire box fiue sheet and their front ends extending well beyond the downwardly curved end of the arch wall but spaced from the fire box door sheet, and extensions on certain other of said elements lying between the projected outlines of the first.

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