US870380A - Fire-box for locomotive-boilers. - Google Patents

Description

` PATENTBD Nov. 5, 1907.

' L M. MGGLELLON. PIRE B0X POR LOC'OMGTIVE BOILERS.

APPLICATION FILED DBO. 20, 1906.

JAMES M. MCCLELLON, OF EVERETT, MASSACHUSETTS.

FIRE-BOX FORv LOCOMOTIVE-BOILERS.

Specification of Letters Patent.

Patented Nov. 5, 1907.

Application filed December 20, 1906. Serial No. 348,790;

To all whom it may concern.'

Be it known that I, JAMES M. MCCLELLON, a citizen of the United States, residing at Everett, county of Middlesex, and State of Massachusetts, have invented an Improvement in Fire-Boxes for Locomotive-Boilers, of which the following description, in connection with the accompanying drawing, is a specification, like letters on the drawing representing like parts.

This invention relates to fire-boxes and has for its object to provide a novel tire-box which will have a greatly increased heating surface, and one on which repairs can be readily made, and also one which can be applied to any ordinary construction of boiler.

The particular features of the invention will be more fully hereinafter described and then pointed out in the claims.

In the drawings, Figure 1 is a vertical section transversely through the iire-box of a locomotive showing one embodiment oi my invention; Fig. 2 is a detail view of one form of lower drum.

The lire-box herein shown has at each side near its bottom a lower drum, said drums being designated by 3 and 4, which extends the length of the fire-box, and at the top above the combustion chamber are steam and water spaces which are connected with the lower drums by means of water tubes 5 and 6.

In the present embodiment of my invention the water space at the top of the combustion chamber is formed between two sheets 7 and 8, the inner sheet 7 constituting in effect a sort of crown-sheet. At the sides of the re-box are water legs 9 and 10 each formed by two sheets 1l and 12 which extend from the lower drum upwardly. The sheets 11 and 12 forming the two side water legs are preferably bent inwardly at their central portions, as at 13, for reasons which will more fully hereinafter appear.

The sheets 11 and l2 forming each water leg are both rivetedto the outer side of the corresponding lower drum, as at 14, and are also nippled thereto, as at 15, 'whereby a ree'communication between the water legs and the drums is established.

The upper ends ot' the'sheets 11 and 12 are shown as bent inwardly and riveted to the upper sheet S, as'at 16, and the crown-sheet 7 may have its edges turned upwardly and riveted to the inner' sheet l2 at the sides of the tire-box as at 70. The sheets 11 and 12 at each side of the nre-box will, of course, be stayed by suitable stay-bolts 17 in usual manner, and each inner sheet l2 is provided with a plurality of periorations 19 at its upper edge which form a communication between the water space above the crownsheet and the water legs.

Below each oi the lower drums 3 and 4 at each side is a mud ring 2l which has communication with the drums through suitable nipples 22. This mud ring is formed by bending a vsheet into substantial U-shape.

The space above the crown-sheet 7 is divided by two longitudinal partitions 23 into two side spaces 24 and 25 and a center space 26 which constitutes a steamdome, said partitions 23 having apertures 27 therein which furnish communication between these various chambers.

The water-tubes 6 extend between the lower drum 4 and the chamber 24, and the water-tubes 5 extend between the lower drum 3 and the chamber 25, said water-tubes crossing each other, as shown in Fig. l. In the drawings this Ere-box has been shown in connection with an ordinary boiler-shell 28 which has lues 29 extending therethrough, and in order to get the greatest amount oi heat out of the hot gases in transit to the flues 29, it is of advantage to so arrange the water-tubes that they cover substantially the full iront area oi the flue-sheet at the back of the re-box. lt is, however, important that the water-tubes should not be so positioned as to reduce the grate area or to intertere with proper firing. To accomplish both these objects, I propose to arrange the lower edge of the water-4 tubes very closely together, butto spread them at their upper end so that they will cover as much as possible of the iront of the flue-sheet. In this embodiment of my invention the water-tubes oi each row are arranged closely together and are staggered where they enter the lower drum, but are separated considerably and are preferably arranged in a single plane at their upper ends.

The drawing-in oi the sheets 11 and 12 is for the purpose of eliminating as far as possible any space between the upper ends of the water-tubes 6 and the lower ends ofthe water-tubes 5.

In order to extract the greatest number of heat units from the hot gases it is desirable to impede to some extent their progress toward the flues for if they pass into the lues 29 too rapidly, the interval of time taken in so passing is not sufficient to permit them to yield up the greatest amount of heat. Accordingly I stagger the Water-tubes 5 of one row relative to those of the next succeeding row and do the same with the water-tubes 6. By thus arranging the water-tubes and by drawing in the sheets 1l and 12 at the sides of the boiler, practically no space is provided through which the hot gases can pass directly to the flues 29 without coming in contact with the water-tubes. With this construction the hot gases are brought continuously in contact with the water-tubes until they pass to the lues 29 and a maximum amount of heat units can thus be delivered to the water Within the water-tubes.

It will be understood, of course, that the sheets 7 and 8 may be stayed in any suitable way if this is found to be necessary.

It will be noted that both the inner and outer sheets 7 and 8 are riveted to the sheet 12 so that said sheet 12 at its upper end acts as a means for tying together and staying said two upper sheets. It will be noted also that the outer sheet 8 is a true section of a cylinder, while the inner sheet 7 is flattened somewhat on the sides. The object in making the outer sheet of this shape is so as to get the greatest possible strength from the sheet without the need of staying it, and the object o flattening the ends of t-he inner sheets S is .t0 make said sheet of such a construction that the Watertubes 5 and 6 may extend thereinto at right angles thereto.

It will be noted that the joints between the inner sheet 7 and the sheets 12 are so situated that the fire does not come in contact therewith, and this is true oi the joints between the sheets 11 and 12 and the drums 3 and 4. In fact there are no joints at all in the boiler with which the lire directly comes in Contact.

If desired the lower drums 3 and 4l may be provided with man-holes for facilitating the removal of any oi the water-tubes or their replacement. Sucha construction is shown in Fig. 2, and in said ligure, each drum is made of two parts, an inner part 30 ot sheet metal which is substantially U-shape, and into which the watertubes 5 are expanded, and the outer part 3l which may be cast metal, said outer part overlapping at its edges and being riveted to the sides of the sheet 30. The sheet 30 is that which comes directly in contact with the lire, and this may be made of better material than the outer section 31 which is not so exposeddirectly to the flame. The cast metal section 31 may be provided with man-holes 32 closed by a suitable man-hole cover 33, and it may be stiliened by suitable ribs 34 extending transversely thereof. In other respects the invention shown in Fig. 2 is similar to that shown in Fig. 1.

Although I have herein shown this construction as embodied in a lire-box ot a locomotive, it will be obvious that the same essential features of construction might be embodied in a stationary or marine boiler, and therefore I do not wish to be limited to a locomotive lire-box.

Having described my invention, what I claim as new and desire to secure by Letters Patent iszl. In a boiler of the locomotive type, the combination with a boiler shell having dues therethrough of a fire-box at one end of the shell, said fire-box having separated inner and outer sheets at its top said inner sheet being outwardly curved, a longitudinally-extending water space at each side of the fire-box near the bottom, and water-tubes connecting each water space with the space between the inner and outer sheets, the water-tubes extending from one water space crossing those that extend from the other, and said water-tubes covering substantially the entire inner sheet.

2. A fire-box having inner and outer sheets at the top the inner sheet being outwardly curved, a longitudinally extending drum at each side thereof at the bottom, a water-leg at each side connecting the corresponding drum with the space between the two sheets, and water-tubes connectingeach drum with said space, the water-tubes that extend from one drum crossing those that extend from the other drum.

3. A ire-box for a locomotive boiler having separated inner and outer sheets at its top the inner sheet being outA Wardly curved, a longitudinally extending drum at each side thereof at the bottom, and water-tubes connecting each drum with the`space between the inner and outer sheets, the water-tubes extending from one drum crossing those that extend from the other drum, and the watertubcs that extend from each drum being nearer together at their lower ends than at their upper ends.

l. A lire-box for a locomotive boiler having separated inner and outer sheets at its top, a longitudinally extending drum at each side thereof at the bottom, and banks or nests of water-tubes connecting each drum with the space between said sheets, each nest of tubes havingfa staggered arrangement where they enter' the drum and being in substantially the saine plane where they enter the inner sheet, and the tubes which extend from one drum crossingthose which extend from the other drum.

5. A fire-box having at its top two sheets, and near its bottom at each side a longitudinally extending drum, a water leg connecting each drum with the space between the sheets, a plurality of banks of water-tubes connecting each drum with said space, the water-tubes of each bank having a staggered arrangement at the lower end and being in the same plane at the upper end, and the watertubes of adjacent banks having a staggered arrangement, the water-tubes extending from one drum crossing those extending from the other drum.

G. A tire-box having two separated sheets at its top, a longitudinally extending drum at each side near the bottoni, two separated sheets at each side connecting the drum with the sheets at the top, said sheets from the sides extending inwardly from both the top and the bottom, and water-tubes connecting each drum with the space between the sheets at the top of the boiler.

7. A lire-box having two separated sheets at its top, a longitudinally extending drum on each side near the botA toin, two separated sheets at each side connecting the drum with the sheets at the top, said sheets at the side extending inwardly from both the top and the bottom, and water-tubes connecting each drum with the space between the sheets at the top of the boiler, the water-tubes extending from one drum crossing those extending from the other drum.

8. A fire-box for a locomotive boiler having two separated sheets at the top, a longitudinally extending drum at the bottom on each side, watertubes connecting each drum with the space between the sheets at the top, the Watertubes extending,l from one drum crossing those extending from the other drum, and separated sheets at each side of the boiler, the upper and lower portions of each sheet being inclined inwardly toward the center of the lire-box.

E). A boiler having a water space at the top, a longitudinally extending drum at each side near the bottom, and water-tubes connecting each drum with the space at'the top of the boiler, each drum being formed of two U-shaped parts connected together along opposite sides of the drum, the portion on the inner side to which the watei'tubes are v connected being formed of wrought metal and the outer portion being formed of castmetal.

l0. A boiler having a water space at the top, a drum at each side thereof at the bottom, Water-tubes extending from each drum to the space at the top of the boiler, and separated sheets forming a water leg at the sides of the boiler, said sheets on each side of the boiler both being riveted to the outside of the corresponding drum.

11. A boiler having a water space at the top, a drum on each side thereof near the bottom, water-tubes extending between said drums and the water space, water legs at each side of the boiler connecting the drums with the space at the top of the boiler, and a mud-ring below the drums.

12. A boiler having two separated sheets at the' top forming a water space between them, and two separated sheets at each side of the boiler constituting a water leg, the limer sheet at each side of the boiler being riveted to both the inner and outer sheets at the top of the boiler.

3. A boiler having two separated sheets at the top forming a water space between them, and two separated sheets at each side ot' the boiler constituting a water leg, the inner sheet at each side of the boiler being riveted to both the inner and outer sheets at the top of the boiler, and both sheets at each side of the boiler being riveted to the top sheet.

14. A boiler comprising two separated sheets at its top forming a water space between them, the outer sheet being curved to the arc of a true circle, and the inner sheet being tlattened on its sides, a drum at each side of the boiler, and water tubes connecting each drum to the at- 'tened portion of the inner sheet on the opposite side of the boiler, the water-tubes which extend from one drum crossing those which extend from the other.

15. A fire-box for a locomotive boiler having separated inner and outer sheets at its top, the inner sheet being outwardly curved, a longitudinally-extending drum at each side thereof at the bottom, and water-tubes connecting each drum with the space between the inner and outer sheets, the waterftubes extending from one drum crossing those that extend from the other drum, and the watertubes that extend from each ydrum being spread at their upper ends to cover substantially the entire area of the inner sheet.

16. A boiler having a water space at its top and a 1on gitudinally-extending drum at each side thereof at the bottom, water-tubes extending from each drum to the space at the top of the boiler, and separated sheets forminf,V a water leg at each side of the boiler, the lower ends of the sheets for each water leg overlapping each other and being secured to the outside of the corresponding drum.

17. A tire-box having a water space at its top, a longitudinally-extending drum at each side at the bottom, two separated sheets at each side connecting the drum with the space at the top and forming between them a water leg, said sheets being bent inwardly at their central longitudinal median line, and water-tubes connecting each drum with the space at the top.

1S. A tire-box for a locomotive boiler having inner and outer sheets at the top, the inner sheet being outwardly curved, a longitudinally-extending water space at each side near the bottom, a water leg at each side connecting the corresponding water space with the space between the two sheets, and water-tubes connecting each water space at the lower side of the drum with the space between the sheets at the top of the drum, the water-tubes that extend from one water space crossing those that extend from the other.

19. A re-box for a locomotive boiler having inner and outer sheets at the top, the inner sheet being outwardly curved, a longitudinally-extending water space at each side near the bottom, a Water leg at each side connecting the corresponding water space with the space between the two sheets, and water-tubes connecting each water space at the ,lower side of the drum with the space between the sheets at the top of the drum, the water-tubes that extend from one water space crossing those that extend from the other, and the water-tubes that extend from each water space being nearer together at their lower ends than at their upper ends.

20, A fire-box having a chamber at its top and a longtudinally-extending water space at each side near the bottom, two sheets at each side forming between them a water leg which connects the space at the side with the chamber at the top, said sheets extending inwardly from both the top and the bottom.

2l. A re-box having a chamber at its top and a longitudinally extending water space-at each side neat the bottom, two sheets at each side forming between them a water leg which connects the space at the side with the chamber at the top, said sheets extending inwardly from both the top and the bottom, and water-tubes connecting each water space with the chamber at the top.

2:2. A fire-box having a water space at its top and a longitudinally-extending water space at each side at the bottom, two separated sheets at each side forming a water leg connecting the space at said side with the water space at the top, said sheets each being bent inwardly at their central longitudinal median line, and water-tubes connecting each longitudinally-extending water space with the space at the top of the lire-box.

In testimony whereof, I have signed my name to this specification, in thel presence of two subscribing witnesses.

JAMES M. MCCLELLON. Witnesses: LotIs C. SMITH, BERTHA F. HnUsER.

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