US1574997A - Locomotive boiler - Google Patents

Description

March 2 1926.

Filed Feb, 21, 192

"J. L. NICHOLSONA LOCOMOTIVE BOILER OOOOOOO bo o`0 oo o 6o o o oo o OGOO GOOG

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JoHN I..y NICHOLSON,

COMPANY, or

OF CHICAGO, ILLINOIS, ASSIGNOR T LOCOMOTIVE FIREBOX CHICAGO, ILLINOIS,

A CORPORATION OF DELAWARE.

LOCOMOTIVE BOILER.

Application led February 11, 1922. Serial No. 538,409.

To all whom it may concern:

Be it known that I, JOHN L. NICHOLSON, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Locomotive Boilers, of which the following is a specification.

My `invention lates t'o improvements in locomotive boiler and has particularrrefcrence to the fireboxes thereof. The general object of my invention is to obtain a more efficient combustion of the fuel in the iirebox; to obtain a more efficient thermic transmission between products of combustion and 'boiler water, and to .improve the circulation of the water within the boiler, so that the capacity, eiiiciency and durability of both the firebox and boiler shall be increased.

' My invention consists generally in the form, construction, arrangement, combination and coaction of parts whereby the above named objects and purposes, together with others that will appear hereinafter, are attainable.

My invention will be more readily understood by reference to the accompanying drawings showing preferred embodiments thereof.l In said drawings:

Figure l is a vertical longitudinal section of the rear end of a locomotive boiler embodying my invention, showing the internally stayed firebox and the water circulating devices, or thermic ,siphons, which, combined therewith, constitute my invention; Fig. 2 is a cross section on the line 2-2 of Fig. 1; Fig. tical section showing a modification of my invention. Fig. 4 is a vertical cross section on either of the lines4-4 of Figs. 1 and 3; and Fig. 5 is a horizontal cross section on either of the lines 5-5 of Figs. 1 and 3.

As indicated, my invention is intended for, and is specially applicable to, locomotive boiler ireboXes that have fire chambers which extend from the back sheet, 1, to the flue sheet, 2, and from one side sheet, 3, to the other side sheet, 3; with a grate or bottom, 4, that corresponds to such dimensions, except as modified by differing designs and positions of the throat sheet, 5, with respect to the flue sheet; (compare Figs. 1

. and 3). The top of the firebox is formed by the crown sheet, 6. Commonly, such fireboxes have a single door, 7, through which the fuel is introduced. The products of 3 is a longitudinal verelement. Like combustion-.are withdrawn through thel ilues, 8, by the action of the exhaust nozzle (not shown) in the front end of the boiler. As usual, the shell of the boiler comprises the barrel, 10, and the iirebox wrapper; the latter composed of the top plate, 12, the

, side plates 13, the outside throat plate, 14,

and the back plate, 15. The wrapper and the fire sheets or walls of the iirebox, define the several water legs of the boiler, to wit, the front leg or throat, 16, the side legs, 17, 17, and the back water le 18, all bottomed by a mud ring,20. The reboX sheets menticned, including the crown sheet, 6, are joined to the wrapper and in the instance o a combustion chamber, as in Fig. 3; also to the barrel, 10, by means of the usual closely spaced stay bolts. Certain of these stay bolts will be 'specially diHerentiated herein because of their important relations to the water circulating elements about to be described.

In that Vembodiment of my invention shown in Figs. 1 to 4, inclusive, it will be seen that the firebox contains' one or' several generally triangular hollow elements which conduct water from the throat or water leg, 16, of the boiler, to the space', 21, above the crown sheet, 6. Two elements are shown in Fig. 2 and three are indicated, but this, it should be understood, is by way of illustration and not by way of limitation. When a plurality of elements are used they are preferably parallel and occupy vertical positions in the iirebox extending longitudinally from the low throat sheet, 5, to the crown sheet and along the latter from a point back of the flue sheet to a point near the back sheet, 1.

Unlike the so-called Nicholson thermic siphon disclosed in U. S. Patent No. 1,337,720, the water wall element of this present invention does not present a bottom which sweeps in a single line from the throatslieet to the rear part of the crown sheet. Instead the water wall is of greater depth at the rear end, and ends abruptly. From this end of the element a rear end neck or outlet tube 23 extends to and through the back sheet, 1, of the iirebox. This. rear end neck is particularly useful in preventing and disposing fioV of any accumulation of solids that might i otherwise collect in the upper corner 24 of the the original thermic Siphon this extended Siphon, at its lower forward nade from a single sheet of metal of the same kind and thickness s the ire sheets of the' I ireboX, such single sheet being folded over a suitable mandrel to give it the cross sec` tional form shown in Fig. 4. The horizontal Vcross sectional appearance of the body of the siphoh is well shown in Fig. 5, wherein it appears that the front and back edges l of the Siphon are fiared outward to provide of the folded sheet are brought together and united by the autogenous welds 29. Being a flat sided hollow wall subject to boiler pres- Vsure, the sides of the siphon are joined by many stay bolts 30, as well shownin Figs. 4 and'5. The upper edges of the body the flanges 31, which, as will be observed, are thus made to surround thel top. opening oroutlet 32 of the Siphon. In practice the flanges 31, of each siphon are accommodated in an opening previously liliade in the crown sheet and the edges of the Siphon anges are riveted Vor welded to the crown sheet at the edges of that opening; hence the top forms apart of the top of the ireboX. In my invention the integral top flangel of each element is made to receive certain of the crown bolts 33, by which the crown sheet is supported. Obviously the bolts, thus fastened in the flanges of the elements or siwhich is lap-jointed I is larger than the `and contraction absorbing diaphragme 34,

.than to call attention stay bolts 39, encircling the ends of the neck phons, serve directly to support the same from the wrapper sheet 12. This construction is well shown in Figs. 2 and 4.

-Referring to Figs. 1 and 2, it will be posed of, a single sheet, which terminates at the ends26 and 26 of the bulging bottom of the element. In that case the intake and outletnecks are made from seamless tubing, and welded to the body of the element at the ends of the bulging bottom thereof. The intake neck preferably discharge connection These connections are fastened in the 'fire sheets through the medium of .the expansion and 35, respectively. These diaphragms are ofthe construction and serve the purposes well defined in said Patent 1,337 ,720, and require no further description here, other are fastened in the outer margins of the diaphragms 34, leaving the central portions one form ofto the fact that the of the diaphragns entirely free'to move 4in and out, and up and down, as required to takeup the expansion and contraction of the lirebox and the associated element.

The water-steamingand circulatinr element or siphon of Fig. 3 differs fromthat of' Fig. 1, in that in its entirety it is formed from a single sheet of metal. In other words its neck portions 25. and' 23 are integral with the body of the siphon. Thus I rovide the element with a full length bulging find it possible to utilize its top flange 31 as a direct support for the overlapping crown sheet 6 of therebox; and if desired the associated crown'stays may be omitted from those.parts of the crown sheet. As will be apparent, the edges of the crown sheet and the edges of the flange 31 -are welded or riyeted together to provide a steam tight Joint.

In all cases the shell ofthe boiler is provided with a suitable number of clean-out plugs 37, opposite the several intake and discharge openings in the Siphon.

The fire bricks 38, which compose the arch of the fire-box, are supported upon the bulging beam portions 26 and 26 of the water circulating elements,e(see Figs. 1 and 23 The construction herein describe has many practical advantages that will be apparent to those skilled in the art.

I call particular attention to the factA that a thermic siphon of the form here described presents a considerable increase of heating surface over an .equivalent Siphon of the kind depicted in Patent 1,337,720. Further, the continuity of the bottom or bulging portion of the Siphon, whereby connection is afforded between the same andthe back water leg of the irebox, insures a free and constant discharge of all sediment and scale which might otherwise settle in the bottom of the element. This arrangement operates as a constant automatic blow-0E for the Siphon, and makes its possible to eX- tend the heating surface, as described; which is equivalent to saying that it makes it possible to pitch the bottom of the Siphon at a much lower angle than seems feasible in the case of the persistently` triangular sihon shown in the aforesaid Patent 1,337

20, without danger of interrupting the discharge of the solids in the circulating boiler water. Having thus described my invention, I claim as new and desire to secure by Letters Patent: f

'1. A locomotive boiler and, its internal irebozr` having a fuel door therein incombination with a vertical longitudinally exof the reboX,

i [irebox having a ment therein, said element having a bottom which is inclined upwardly and rearwardly, and terminal neck portions, one of which extends into the frontlwater space of the boiler and the other into the back water space above the fuel door, and said element at its top opening through the crown sheet of the irebox. v

2. Av locomotive boiler 'and its internal rebox having a fuel door therein in combi- Vnation with a vertical longitudinally exteliding Water steaming and circulating element therein, said element having` a bottom which is inclined upwardly and rearwardly, a top which opens through the crown sheet and terminal neck, portions which extend intothe front and back water spaces, one of said neck portions being in the form of a separate 'piece of seamless steel tubing jointed to the body portion of the water steaming and circulating element. 3. A locomotive boiler and its internal bination with a vertical longitudinally extending water steaming and circulating ele# ment therein, said element having a botuel door therein in' com` tom which is inclined upwardly and rearwardly, a top which opens through the crown sheet of the firebox, and terminal neck portions which extend into front and back water spaces, said neck portions being in the .formp of .separate lengths of tubing permanently joined yto the end portions of theinclined bottom of the body portion of the water steaming and circulating element.

4. A locomotive boiler and its internal irebox having a fuel door therein in combi nation with a vertical longitudinally extendingv Water steaming and circulating element therein, said element having a bottom which is inclined upwardly and rearwardly,

a top which opens through the crown sheet of the irebox, and terminal neck portions which extend into front and back lWater spaces, said neck portions of separate lengths of tubing welded to the end portions of the inclined bottom of the body portion of the water steaming and circulating element.

ture.

being in the orm- In testimony whereof, aiix my signa-

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