US1138035A - Locomotive-boiler furnace. - Google Patents

Description

C. B. MO0RE.` Locomonvs Boum funn/ugs. APPLICATION FILED DELH. |9l. 1,138,035. Patented May 4, 1915.

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MOTIVI-Bom MAUR 1,138,035. Mum-emmen Patented May 4, 1915.

` Appununmeane-bens, 1911. sei-1.11am. Toallwltomitmay concern.- which form a part of lthis specification, I Be it known that I, CHARLES B. Moon, a have Illustrated a preferred form of my incitizen of the United States, and a l'ident venon together with a modified form of the city of Evanston, county of Cook, thereof.

and State of Illinois, have invented certain new and useful Improvements in Locomotive-Boiler Furnaces, of which the following is a specification.

My invention relates to improvements in locomotive boiler furnaces and has particular reference to improvements in refractory baille or deiecting walls, sometimes called arches, for ireboxes of locomotive boilers.Y

The general objects of my invention are to provide an improved refractory arch which may be easily and quickly installed in locomotive fireboxes, which are provided with circulating tubes; to provide an arch which shall be of comparatively light weight and low cost; to provide an arch which shall be adapted for easy repair and parts of which may be removed to afford easy access to the firebox side sheets; and to provide an arch of a form that will materially assist in admixing, commingling and igniting the irebox gases and combustibles.

A- special object of my invention is to provide a system of arch construction whereby arches, having the characteristics here outlined, can be readily, easily and cheaply installed in locomotive boiler fireboxes provided with circulating tubes and in which the spacing of the tubes is not exactly equal, or the same throughout the extent of the arch.

A further feature of my improvement consists in the convenience with which arches having the above characteristics can be constructed in ireboxes of various widths and having different spacings of tubes with the use of substantially identical bricks. In other words, my invention contemplates the building of arches in various boilers by the use of bricks or slabs, all of which have substantially the same form and dimensions.

y invention consists in the several improvements and various constructions and combinations of parts whereby the aboveobjects and features are obtained and preserved together with others hereinafter appearing, and all as hereinafter fully described in reference to the accompanying drawings and as particldarly pointed out in the appended claims. In sald drawmgs In said draw' Figure 1l is a vertical central longitudlilil section of a locomotive box equipped with an arch embodying my invention, in a preferred form or structure the section being on the line 1 1 of Fig. 2; Fig. 2 is a longitudinal horizontal section of the firebox on the line 2 2 of Fig. 1 and showing a top plan view of the arch; Fig. 3 is a partial vertical tansverse section of the firebox on the line 3 3 of Fig. 1; Fig. 4 is a detail transverse section of the arch on the line 4 4 of Fig. 1; Fig. 5 is a perspective view of a single brick.

My invention may be embodied in arches of varying construction and located in different positions in the lirebox. I have limited the illustration of my invention to socalled front arches. It should be underhowever, that my invention is not limited to this specific form and location of arch.

A locomotive boiler irebox as shown in the drawings consists of a liuc sheet 2, side sheets 3 3, a crown sheet 4 and a rear sheet 5. The firebox is provided at its lower end 6. F lues 7 lead forward from and the rear sheet is provided with a fuel door or opening 8. The irebox as illustrated is provided with four inclined circulating arch tubes 9, the same being arranged substantially parallel with the side sheets of the firebox and inclined forwardly and downwardly from the upper portion of the rear sheet to the lower portion of the flue sheet and serve to increase the circulation or iiow of water between the front and rear water legs of the boiler. It is usually intended that the spacing of the tubes in the firebox be substantially equal, at least to the extent that they serve as supports for the arch. However, on account of the spacing of the `stay bolts or for other reasons it ently occurs that these tu are not spaced equally both in relation to themselves and to the side sheets of the firebox and a particular feature of my invention resides in an arch brick so formed that it may position by serve equally well in positions in which the tubes vary considerably y tions.

in their spacings, ns welles where thaspae ing of the tubes is equal throughout the extent of the arch. o

A so-called front arch usually occupies an inclined position in the forward end of the irebox extending substantially from side to side thereof and having its forward end in abutment with or arranged in close proximity to the flue sheet. The function of such arches is to obstruct the flow of the firebox gases in their passa e from the grate t0 the iues and to deiect t causing them not only to flow backward and forward through the iirebox but also to be retained in the iirebox a sufficient time for com lete combustion to take place. The deflection of these gases and their consequent retention in the rebox results in an even distribution of the heat of combustion throughout the interior surface of the firebox and particularly throughout the length of the crown sheet. The deflection of the gases further results in the breaking up and admixing the streams of gases and I add to this effect by providing the arch with a plurality of subsidiary gas deflecting surfaces arranged in various planes, whereby the body of fiowing gas is not only deflected generally, but the various portions thereof are caused to intermix and commingle whereby substantially perfect combustion is attained in the firebox. Refractory arches which are light in construction and arranged as described, soon attain incandescence and thereby assist in the ignition of the gases and the other combustibles and I greatly enhance this effect'of the arch by roviding the under surface of the arch with many comparatively thin ribs or depending por- The arch, as illustrated, consists of a lurality of transverse rows of bricks, eac row comprising a number of bricks c which are arranged to be supported upon adjacent tubes or upon a tube and the adjacent side sheet. These bricks are limited in size by the fact that they should not be too heavy to be easily handled and placed in position and should be small enough to be readily passed through the fuel door into the firebox. The bricks c are substantially rectangular in shape and their length in a general sense is determined by the spacing of the tubes, but they are so formed that they may be used in connection with tubes, the spacings of which vary to a considerable extent. The ends c* of the bricks c which rest upon the tubes are cut away or angled, the length of the lower face of each brick being considerably shorter than the length of the back or upper face of the brick. The transverse section of these bricks is consequently wedge shaped and the bricks having considerable thickness they are adapted to fit between tubes whose, spacings vary from a fixed standard. The bricks in any special em out of their course,

struct an arch installation arev ly jacent tubes until t e thereon. The lower aces provided withgas mixing lowered between adfind a resting place of the bricks are pocketsor cavi- "ties, and as clearly lillustrated nFigs. 1

and 4, the incloslng walls or surfaces of these pockets or cavities are inclined relatively to the upper and lower faces of the brick, and the arch is thereby provided with many gas defiecting surfaces arranged in different angularly disposed planes. These pockets or cavities and the inclined ends of the bricks assist in the main action of the arch in commingling and admixing the firebox gases. When installing an arch in accordance with my invention, I first arrange a\ transverse row of the arch bricks c resting them upon the tubes and spacing them from the flue sheet by means of spacing blocks or bricks b on the lower ends of said tubes. I then lace a second transverse row of the arch ricks higher up in the rebox resting upon the arch tubes and a ainst the first row. The arch is completed y placing further transverse rows in position above those already placed, sufficient in number to conof the desired height or length. This height or length is determined by the shape of the Iirebox and the action of the draft therein, usually extending to about the longitudinal center of the firebox.

In Figs. 3, 4 and 5 I have illustrated the bricks, c, in detail. The general form and purpose of the brick is described above. The under surface, of the brick, c, is provided with the gas mixing pockets or recesses c in the form of two open ended ockets or cavities divided or separated by a thick central plortion or transverse rib c2. The tops cs of t ese pockets are curved upwardly and outwardly from the lower face of the rib c2, to the opposite ends of the brick. This construction provides the brick c with side fianges c* at each end, and consequently the tubes upon which these bricks rest are exposed to the action of the firebox gases. The inclined ends of the bricks c and the upwardly and outwardly curved tops c3 of the open ended pockets c tend to direct the flow of the firebox gases directly against the sides of the circulating tubes 9 and this 'action besides aiding in the commingling of the gases adds very much to the rapidity of the transmission of heat through the walls of the tubes to the contained water.

The arch being built up of a plurality of individual bricks each one of which is supported independent of the others, provides a structure from which any one or number of bricks may be removed easily without disturbing the rest of the arch when it is necessary to replace broken bricks or repair the arch. Further the end bricks of the rows can be removed without disturbing any other part of the arch when it is desired to repair the side sheets or the stay bolts.

advantage peculiar to this improved construction of arch is that the end bricks of the transverse rows serve to steady the arch or lock it againstlateral movement 1n the irebox and yet on account of the arch.

being built up of a plurality of comparatively small members it is as a whole more or less iiexible and can accommodate or adjust itself to any slight differences of dimensions of the firebox due to contraction or expansion of the irebox sheets on account of varying temperatures and pressures. When the rebox expands the separate bricks of the arch settle between thc tubes and when it contracts these bricks are, in a sense, automatically raised on the tubes on account of their inclined ends.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

1. A locomotive boiler firebox containing a plurality of arch supporting tubes, in combination with a plurality of transverse rows of arch bricks supported by said tubes, said rows extending from side to side in the firebox and arranged side by side upon the tubes, each said brick having oppositely inclined flat ends, the upper face of each brick being longer than the space between the supports upon which it rests whereby the brick depends between its supports and is thereby held against lateral movement in the irebox, and each said brick havin oppositely disposed open ended recesses 1n its underside2 adapted to deflect the firebox gases against the supports upon which the brick rests, substantially as described.

2. A locomotive boiler firebox containing a plurality of arch tubes, in combination with a front arch extending from side sheet to side sheet, and composed of a plurality of substantial identical bricks, each said brick being flat and oppositely beveled at its ends where it rests upon its supports and whereby it is held against lateral movement in the firebox, and each said brick being provided on its underside with oppositely disposed. curved bottomed open ended recesses adapted to deflect the lirebox gases laterally against the supports upon which the brick rests.

3. A locomotive boiler iireoox containing inclined arch tubes, in combination with a longitudinal row of substantially identical bricks resting upon a tube and wedgingly engaging the adjacent side sheet othe firebox, each said brick having its ends oppositely beveled, and being provided on its under surface with a gas-mixing pocket or cavity having a curved bottom and an open end adapted to deflect the ilirebox gases against the side sheet of the firebox, substantially as described.

4. An arch brick for use in a locomotive boiler furnace provided with arch tubes spaced apart, the brick being adapted to rest upon the tubes and having its, transverse ends which contact with the tubes flat and oppositely beveled, two oppositely extending recesses in the bottom of the brick having upwardly and outwardly curved bottoms and open ends whereby they are adapted to deflect the firebox gases laterally against the sides of the tubes upon 'which the bricks rest.

5. A locomotive lirebox arch-brick, composed of refractory material, having ends formed for engagement with arch tubes and in its bottom provided with oppositely extending cavities or recesses which open through respective ends of the brick, for the purposes described.

6. A locomotive rebox arch-brick, composed of refractory material, having ends formed for engagement with arch tubes and in its bottom provided with grooves which open through respective ends of the brick, there being a thick portion which separates said grooves, for the purposes described.

In testimony whereof, I have hereunto set my hand, this 5th day of December, 1911, in the presence of two subscribing witnesses.

CHARLES B. MOORE.

Witnesses:

EDWARD F. WILSON, CHARLES GILBERT Hasta?

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