US1604466A - Circulating cell for fire boxes - Google Patents

Description

Oct. 26 1926.

C. H. MILLER CIRCULATING CELL FOR FIRE BOXES Filed April 17. 1925 nan-O O B060 O 0 00 O DQQO O 0950 O 600 O 000 0 D00 0 G90 0 fig-.5

"7 k /VI Patented Oct. 26, 1926. i

FATENT CHARLES H. MILLER, OF MELWIPHIS, TENNESSEE, ASSIGNOR OF ONE-HALF TO JOSEPH HATTENDORF, OF IVIEMPHIS, TENNESSEE.

CIRCULATING CELL FOR FIRE BOXES.

Application filed. April 17, 1925.

In boilers of locomotive type in which the fire boxes are flanked on the sides by what is known as water legs, there is a lack of circulation in the lower portion of these legs which decreases very considerably the value of the heating surface adjacent to the hottest part of the fire and thereby makes necessary an increase in heating surface area in order to compensate for this reduction.

The objects of my invention are primarily, to provide means whereby the circulation of the water in these water legs will be improved, and

secondarily, to provide an improved circulating cell for this purpose.

I accomplish these objects as will be more fully hereinafter set out in the drawings, specification and claims.

In the drawings:

Fig. 1 is a half end elevation and half section of the fire box end of a locomotive type boiler.

Fig. 2 is a cross section on an enlarged box side sheet which are spaced apart to form the water leg. 3 indicates stay bolts, the center lines only being shown in this new stay bolts 6, also indicated only.

My improved circulating cell is a tube 7, the fire side of which is preferably seinicircular in cross section with a flattened side 8 adjacent the fire box side sheet 2, the tube being preferably of constant width but of increasing depth from the lower to the upper end. This tube has an opening 9 near the lower end and an opening 10 near the upper end thereof and is longitudinally shaped to conform to the curvature ofthe sheets to which it is to be attached. The lower end of the tube is secured as near the bottom of the water leg as is feasible and the upper end is secured to the fire box crown sheet slightly to one side of the center line of the leaner.

41 is the outer crown sheet and 5 the fire box crown sheet, similarly connected by Serial No. 23,791.

The tube 7 as shown in cross section in Fig. 2 is rolled from a plate in such manner that there will be an arcuate or partly circular section 11, and in the deeper portions parallel sections 12 integral therewith, having outwardly turned flanges 13 extending therefrom, thus forming a deep channel, the open side of which thus is closed by a flat plate 8 which is secured thereto by welding along lines 15 and 16, thus forming a tube with one flat side and outwardly extending flanges. By varying the width of theparallel sections 12 the depth of the tube may be increased or decreased as the case may be,

giving the variation in depth shown in the section Fig. 1.

Adjacent the upper and lower ends of this tube, the plate 8 is cut away to give the open ings 10 and 9 before mentioned. Also in forming the tube it is as before noted, so curved longitudinally that the flanges 13 and the plate 8 are exactly conformed to the inner contour or fire side of the sheets 2 and 5. These sheets are cut away where the tube 7 is to be placed for a space embracing three lines of stay bolts as more clearly shown in Fig. 2, where 3*, 3 and 3 indicate stay bolts. The tube 7 is placed against the sheets 2 and 5 on the fire side thereof over the opening so cut and the outer edges of the flanges 13 are welded to this sheet. These flanges only overlap the edges of the sheets 2 and 5, adja cent this opening, suificiently to permit a perfect. .weld, the purpose being as far as possible to present as little sheet of double thickness to the flames as possible. When the tube has been so welded, the center row of stay bolts 3 is connected into the plate 8, with the exception of one stay bolt near the upper end and one stay bolt near the lower end in line with the openings 10 and 9 respectively which are ntended through these openings into the arcuate section 11 of the tube. The outer rows of rivets 3 and 3 are extended through and secured to the flanges 13 thus throwing the entire strain on the stay bolts rather than on the welds.

In Fig. 3 the location of three of these tubes 7 is indicated in dotted lines, there being in this case three of the tubes on each side of the boiler. If it be desired additional tubes 7 may be placed at the end of the boiler on each side of the fire door 17, as shown in Fig. 1.

in 2 the stay i-iolt is shown in tion with a center hole therein. This type of centrally drilled stay bolts is preferably the one used in attaching these tubes, the purpose being to function not only as the ordinary tell-tale but also to provide aguiding means so that in case of a broken stay bolt a drill may be centered by this hole and the broken end of the bolt drilled out without damage to the sheets.

The action of the device is as follows Naterin the tube is heated to a greater extent by its proximity to the flames than is the water in the water leg of the boiler, it therefore is caused to circulate upward in these tubes. the additional spacev provided by the enlargement of the cross section from bottom to top assisting this action, and a circulation of the water is thereby set up which causes the same to travel downward in the water leg to replace that moving upward through the tube thereby greatly increasing the e'lfioiency of that portion of the boiler.

Having now fully described my invention, what I claim and desire to secure by Letters Patent in the United States, is

1.. In a boiler having fire box, a water leg on each side, and a crown sheet over said fire box, a tubular cell within said fire box, having one of its sides shaped to conform to the inner surface thereof, and extending from the lower portion of a water leg upward to the crown sheet, and communicating with an opening therein and with said Water leg, whereby water circulation is induced in the water leg, said cell being secured to the water leg substantially throughout the length of the cell. r

2. In a boiler having a fire box, a water leg on each side, and a crown sheet over said fire box, a tubular cell within said fire box, extending upward from the lower portion of a water leg to the crown sheet, said cell gradually increasing in diameter in one direction from bottom to top, while retaining the same diameter in another direction, said cell being secured to the water leg substan-,

tially throughout the length of the cell.

3. In a boiler having a fire box, a water leg on each side, and a crown sheet over said fire box, a tubular cell within said fire box, extending upward from the lower portion of a water leg, along, and throughout its length secured to, said water leg and said crown sheet, and communicating with an opening in said crown sheet.

4. In a boiler having a fire box, a water leg on each side, and a crown sheet over said fire box, a tubular cell within said fire box, extending upward from the lower portion of a water leg, along, and throughout its length secured to, said water leg and said crown sheet, and communicating with openings in said crown sheet and said water leg, respectively.

5. In a boiler having a fire box, a water leg on each side, and a crown sheet over said fire box, a tubular cell within said fire box, flanged throughout its length, extending upward from the lower portion of a water leg, along said water leg and said crown sheet, said flanges being welded to the fire sheet of said water leg and to said crown sheet, and said sheets being cut away at predetcru'iined points between said welds.

6. In a boiler having a fire box, a water leg formed by an outer and inner sheet, an outer crown sheet, an inner crown sheet over the fire box, and stay bolts connecting said outer and inner sheets, a tubular cell within said fire box, flanged throughout its length. extending upward from-the lower portion of said water leg along said inner sheets and to said crown sheet, 'said inner sheets being cut away at predetermined points along said cell for a greater width than three rows of stay bolts, said flanges being welded to said sheets adjacent the openings thus formed, and said stay bolts being secured into said cell flanges and wall.

7. A boiler having a fire box, a water leg at each side thereof, anda crown sheet thereover, in combination with a water-circulating member comprising a metal tube of partially arcuate cross-sectional configuration flattened at one side to form a substantially plane exterior surface, said tube having its respective ends secured to a water leg and to said crown sheet, and being secured throughout its length to said parts, and said tube communicating with said boiler at a plurality of different points.

8. A. boiler having a fire box, a water leg at each side thereof, and a crown sheet thereover, in combination with a water-circulating member comprising a metal tube having an arcuate surface at one side, a plane surface at another side, and substantially plane surfaces connecting said plane surfaces and said arcuate surface, said first-named plane surface being shaped to conform to the inner surface of said fire box and being secured thereto, and said tube communicating with said boiler at a plurality of different points.

9. A boiler having a fire box, a water leg at each side thereof, and a crown sheet there-- over, in combination with a water-circulating member comprising a metal tube having an arcuate surface at one side, a plane surface at another side, and substantially plane surfaces connecting said plane surface and said arcuate surface, said substantially plane surfaces being provided with flanges shaped to conform to the inner surface of said fire box and being secured thereto throughout their length, and said tube comn'iunicating with said boiler at a plurality of different points.

10. A boiler having a fire box, a water leg at each side thereof, and a crown sheet therellt) over, in combination with a water-circulating member communicating with said boiler at a plurality of diflerent points, and comprising a metal tube having an arcuate surface at one side, a plane surface at another side, and substantially plane surfaces conmeeting said plane surface and said arcuate surface, and varying in width from one end of said tube to the other, whereby the crosssectional area of said tube increases from its lower to its upper end.

11. A boiler having a fire box, a water leg at each side thereof, and a crown sheet thereover, in combination with a water-circulating member comprising a tube having an arcuate surface at one side, a plane surface at another side, conforming to the inner surface of said fire box and secured thereto substantially throughout the length of said tube, and openings in said plane side C0111- municating with openings into a water leg and in said crown sheet, respectively.

12. A boiler having a fire box, a water leg formed by an outer and an inner sheet, an outer crown sheet, an inner crown sheet, and stay bolts connecting adjacent ones of said inner and outer sheets, in combination with a water-circulating element comprising a tube of irregular cross-section, communicating with said boiler at a plurality of different points, and shaped to conform to the inner surface of said fire box, and a stay bolt connecting one of said outer sheets with the side of the body wall of said tube which is farthest from said sheet.

In testimony whereof I have hereunto set my name.

CHARLES H. MILLER.

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