US530566A - Locomotive-boiler furnace - Google Patents

Description

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G. H. WATSON. LOGOMOTIVE BOILER PURNAGL.

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. G'. H. WATSON.

LOGOMOTIVB BQILER PURNA'GE. A No. 530,566. I Patented Deo. 1 1, 1894,.-

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G.'-H. WATS0N. LOGOMOTIVE BOILER FURNACE.

Patented Deo. 11

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No. 530,566. Patented Dec. 1'1, 1894.

UNITED STATES i PATENT i OFFICE.

GEORGE H. `W'ATSON,V uSI. LOUIS, MISSOURI.

LOCO'MOTIVEfBOILER FU RNAC E.

SPECIFICATION forming part of Letters Patent No. 530,566, dated December 11, 1894.

Original application filed December 30, 1892, Serial 110.456.769. Divided and this application led June 3, 1893. Renewed October 24, 1894:. Serial No.526,814. (No model.)

.and exact specification.

My invention relates to down draft locomotive boiler furnaces, and has for its object the simplification of the construction of such furnaces; to render them very durable while lat the same time greatlyreducing the cost`- thereof; to perfect the Water circulation' of the boiler, and further to entirely avoid the detrimental results, so" often observediher'el tofore, andcaused bythe accumulation of scale and boiler settlings. i i

My invention consists in general in the con#` structions and combinations all as hereinaf-` ter described, and particularly pointed out in the claims. i y The invention will be more readily understood by reference to the accompanying drawings, forming a part of this specification, and

Figure lis a vertical, longitudinal elevation on the line 1--1 of Fig. 2. Fig. 2 is an elevation of the frontend of the boiler one half thereof being shown in section on the line -a: of Fig. 1. Fig. 3 is a vertical, longitudinal section taken on the line .ef-#z ofV Fig. 4 and showing a modified form of my boilerfurnace. Fig. 4; is a vertical transverse section on the line y-y of Fig. 3. y

As shown in the drawings 2 represents the boiler casingor shell, within the depending portion of'which is arranged the fire box, surrounded upon its four sides` by the water legs or sides 3, 4 and 5, 5, and having its topI that the fire box is divided into three main parts, namely, the fuel chamber 10,the combustion chamber 11 immediately beneath the same, and the escape chamber or duct 12;

the division being made by the basket grate shown. This grate is formed of the two sets` of, upper and lower, hollow grate bars or` tubes l13 and 14, respectively. These tubes have their forward ends fastened by suitable means in the front plate 15 and extend therefrom horizontally through the fire box, being bent or curved upwardly at some distance from the flue sheet. The ends are from thence carried directly up and through the crown sheet 6, wherein they are suitably` secured. The space 12, between the tubes and the ilue sheet 16, is wide and large. Communication between the same and the chamber 10, is entirely cut off and prevented by a lilling' 17 of a suitable materiaharranged between the upright parts of the water tubes.

"Therefore products of combustion issuing from fuelburning upon the horizontal parts of the grate bars and supplied with air entering through the door 19 can only escape by passing downward between said horizontal parts and into the combustion chamber, passing thence into the escape space or duct 12 communicating with the boiler flues 19.

Each hollowgrate bar is formed of a single .piece of pipe, the lower endiof which pierces ythe front sheet 15 and communicates with the water leg 4, while theupper end of the tube pierces through the crown sheet 6. Any suitable means may be employed for fastening the tubes in the front and crown sheets, but I much prefer the use of the wate1tight, all threaded connections shown plainly in Figs. 1 and 4.. As shown the ends of the tubes are threaded back for quite a distance, and the accommodate expansion andcontraction.

A further andmost important feature of the construction, consists in the arrangement of the up-turned ends ofthe upper and lower sets of grate bars or tubes, so as to hold the refractory iillingbetween said tip-turned ends IOO firmly in place and prevent dislodgment of the filling by the violent vibration to which a locomotive boiler, particularly, is subjected, For this purpose I carry the bend of the upper set of bars or tubes farther back than that of the lower set so that the upper ends of the upper set of bars stand back of the ends of the lower set, thus forming a crotch or seat 21, to support the filling 17.

In my furnace the construction of those parts which lie above the chamber 11, is in all cases substantially the same, but below that point the construction may vary. `For instance the combustion chamber 1l may terminate in the closed bottom 22, having be'- neath it the water bottom, as shown in Figs.' 3 and 4. The ashes from the down draft f grate fall upon the bottom 22 and areremoved from thence through the normallyclosedash' pit door 23. The yconstruction which I prefer, however, is shown in Figs. l ,and 2, an upward draft grate 24, thus formingthe bottom vof the combustion chamber. y A portion of the fuel placed upon the downdraft grate falls through upon the grate A24, and there continues` to burn, adding greatly to the'extent of the comibustion of the gases-in the combustion chamiber and hence to the general eiiciencyof the boiler. Beneath the grate 24, I provideithe ash pan 25, which is normally tightly closed to the entrance of air, but which has one or more doors 25, through which the ashes may be removed and which Vdoorsmay vbe opened whenever an upward draft through the lower grate is deemed necessary. i

The advantages of a furnace constructed as described, are: first, the uninterrupted ciriculation of water from the front water leg, through the water ,bars directly into the .top of the boiler; second, the total absence ofsediment pockets in the path vof active circula` tion; third, the entire freedom from detri- --mental results of contraction and expansionili the water grate barsy or, tubes; fourth, the complete stoppage of all draft acrossv the top of the fuel upon the down draftgrate, and d ue to the employment of the filling 17 5 fifth, the added heating surface resulting fromzthe exposure of the outer surfacesyof ythe upturned parts of the water bars 13, 14, the inner parts only of. said bars being embedded in the refractory material forming the filling 17; and

lastly, and .arising from the'use of .both .up draft and down draft grates the thorough combustion of all gases and carbon while within the combustion chamber ll, which rel sults in an almost complete abatement of the ,dense black smoke which .ordinarily arises from the boiler furnaces particularly-where bituminous coal isused.

This applicationis ledas va division of my application filed December 30, 1892, Serial No. 456,759, the subject matter contai'nedlherein having been withdrawn from the.v prior application.

Having thus describedmy invention,` what I claim as new, and desire to secure by Letters Patent, is-

1. The combination with the front and crown sheets of a locomotive boiler, or like furnace, and the water spaces surrounding the same, water grate bars having their rear ends bent or curved upwardly, the opposite ends of said bars 4being extended through and secured in said front and crown sheets respectively, and the spaces between the upturned ends or parts of the water bars being closed by a suitable filling, substantially as and for the purpose specified.

2. The combination with the boiler shell, ofthe fire box arranged therein and surrounded by the water spaces or legs, the front crown and flue sheets respectively, of said box, a door 19 leadinginto the-upper; part .thereof and the basket grate formed by a series of tubes or pipes, extending part way through theflre box` and; bent or carried upward in the rear partthereof, the lowerends of said pipes being extended throughland securedin the front sheet to communicate; with the front `water leg, the upper ends of the pipesbeing `carried upward through, and securedin the watertubes or bars forming the grate within said fire box, the rear-ends of saidbarsbeing carried upwardly in front of thegluepsheet andextended through the: crown:` sheet, the

lower and forward-ends 'of the barspassing through the front sheet Aand thus com muni cating with the front water leg andthe-,spaces between jthe up-turnedparts of" the water tubes, being filled lwith refractory material,

while the outsidesurfaces of. saidyupfturned parts areexposed, substantially asand for the, purpose specified.

i. The @ombinauonvw/ith'the boiler sneu, of the. fire box arrangedtherein and having the front, crown, and, flue, sheetsrespect ively, the water tubes' or bars forming the grate-within said box, and 4havingtheirrear ends extendingupwardly infront of said -iue .sheet,the oppositeends of,k said pipesy being connected with, the water spaces surrounding the, fire, vbox andthespaces betweenythe upright -partsgof s aidtubes orgbars beingclosed byy asuitable filling ,to compel a down, draft ith-roughithe spaces; between theV lower parts lof' the4 tubes, .substantially as described.

;5.: The; combination with the boilershell,

of the ;re box arrangedthereim the upper and lowersets, of f water; grate 1` bars ,or :tubes ,1 3, 14, rthe rearends of saidtubesbeing bent or curved and; extendedwupwardlyin the-rear lpart oftsaid-vbox, the upturned-.,ei1ds of the IOO IIO

upper set of bars being extended through the spaces between the like ends of the lower bars and standing back of the same to form `a crotch or seat 21, a refractory filling arranged between the up-turned ends of the two sets of bars and resting in said seat, and the ends of said grate bars being connected with the water spaces of the boiler, substan-` tially as described.

6. The combination with the boiler shell, of the lire box arranged therein, the upper and lower sets of water grate bars or tubes, 13, 14, the rear ends of said tubes being bent or curved andextended upwardly in the rear parts of the box, the up-turned ends of the upper set of bars being extended through the spaces between the ends of the lower bars and standing back of the same to form a crotch or seat 21, a refractory filling arranged between the up-turned ends of the two sets of bars, and resting in said seat, and the opposite ends of said barsbeing extended through and secured in the front sheet and the crown sheet of the tire box, respectively, and communicating directly with the surrounding water spaces, substantially as described.

7. The combination with the boiler shell, of the fire box arranged therein, and surrounded by the water spaces, the bent tubes having the horizontal and upright parts, the

ends of said tubes being secured in the front and crown sheets of the tire box, respectively, by all threaded connections and the spaces between the upright parts of the tubes being closed by a refractory filling, substantially as described.

8. The combination with the boiler casing, of the tire box arranged therein, the water tubes extending horizontally and vertically in said lire box and connected with the surrounding water spaces, the spaces between the ver-tical parts of said tubes being closed by a suitable filling, said fire box being dvided by the grate so formed into the three chambers 10, 11 and 12, respectively, and an up draft grate provided in the lower part of the fire box and a normally closed ash receptacle or space provided beneath the same, substantially as described.

In testimony whereof I have hereunder set my hand this 3d day of June, 1893.

GEORGE H. WATSON.

Witnesses:

y C. G. HAWLEY,

LEONARD H. DYER.

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