US723241A - Straw-burning traction-engine boiler. - Google Patents

Description

ow 0 9 1 4' Pm A M, D .E T N E T A P QM R E B M A H 0 H G L 4 3 2 7 nu N STRAW BURNING TRACTION ENGINE BOILER.

APPLICATION IILED AUG. 12, 1901.

no MODEL.

, www W Mfnesses I is capable of ascending and descending steep 2O boiler of great strength and large capacity,

UNITED STATES PATENT EFICE.

CLARENCE ELMER CHAMBERS, OF SAN JACINTO, CALIFORNIA.

SITRAW-BURNING TRACTION-ENGINE BOILER.

SPECIFICATION forming part of Letters Patent No. 723,241, dated March 24, 1903. Application filed August 12, 1901. Serial Nol 71,838; (No model.)

side and State of California, haveinveuted a new and useful Straw-Burning Traction-Engine Boiler, of which the followingis a specification.

This invention is particularly designed for a steam-boiler to be used on a traction-engine adapted for burning straw. It is also adapt I ed, however, for burning other kinds of fuel and is an economical boiler'for stationary engines and also for locomotive-boilers.

One of the objects of this inventiouis to i provide a steam-boiler of great capacity which grades without exposing the crown-sheet to the steam.

Another object is to provide a very narrow so that it can be carried on wheels having a very narrow tread between them.

Another object in view is to provide great strength and also to provide against lodgment of sediment on any part of the boiler subject to theiaction of the flame, thereby to prevent any burning out of the boiler.

front elevation of the boiler.

The accompanyingdrawings illustrate my invention.

In the drawings I have omitted the stayrods and braces, and it is to be understood that in constructing the boiler the necessary braces and stay-rods will be employed.

Figure I is a longitudinal mid-section of a boiler embodying myinvention. Fig. II is a Figs. III, IV, and V are sections, respectively, on lines III, IV, and V,-respectively, Fig. I, looking to the left. Fig. V1 is an elevation on line VI,

. Fig. I, looking to the right.

1 2 3 indicate in a general way a combined boiler-shell, steam-dome, and water-leg.

4 indicates a fire-box located within the water-leg and below the steam-dome and:

5 and a flue-sheet 6,:forming the front wall of said upward extension.

7 indicates a smoke-box at the front end of the boiler. Said smoke-box is provided with a suitable smoke-outlet 8 into a smoke-stack 9, leading therefrom.

inside wall 13 of the water-leg.

6 of the fire-box and the flue-sheet 11 of the smokebox.

12 indicates the upper front sheet of the fire-box, and the same is bent in asemicylindrical form and extends between the lower water-space of the boiler and-the front of the fire-box and is connected at the rear with the flue-sheet 6 and at front and sides with the Said front sheet of the fire-box slopes forward and downward beneath the tubes 10 to the wall of the water-leg 3.

a indicates the boiler-shell, the front portion b of which is cylindrical, and said shell has at its rear end .an upward extension 0 to form the steam-dome above the tubes and the fire-box. The transverse diameter of the upward extension 0 of the boiler-shell is approximately the same as the diameter of the cylindrical portion 5 of said boiler-shell, and the water-leg 3 is preferably of no greater diameter from side to side than the greatest diameter of the shell. The upward extension 0 of the boiler is above the level of the cylindrical portion 1), and the forward extension of the water-leg is below said portion. The upward extension 5 of the fire-box is between the body of the boiler and the water-leg of the boiler. By constructing the parts in this manner a thin body of water is exposed to the action of the heat at the sides and on top of the leg extension and also at the sides of the fire-box extension, thereby heating it very quickly and causing a very rapid circulation of the water between the leg and the main portion of the boiler; The extension of the leg forward permits of the insertion of a sufficient quantity of straw to generate the desired amount of steam and also causes the flames to be drawn longitudinally through the leg, thereby causing a complete combustion of the straw, and by locating the crownsheet 12 at the forward end of the fire-box and inclining it upward to the rear the blaze from the forward extension ofthe fire-box strikes it and is checked before passing up into the vertical extension 5. This lessens engines to which my improved boiler is more I particularly applicable, and by-reducing the water area at each end and increasing it vertically at the center the inclination of the boiler in vertical plane will not be so apt to expose any portion of the tubes or crownsheet, thereby adapting the engine for use over a rough or hilly country. The forward crown-sheet 12 of the fire-box slopes forward and downward to the water-leg 3 in order that any sediment which may fall thereon may slide down therefrom into the Water-leg.

14 indicates a blow-off cock which may be located at any desirable point and is preferably in such a position as to readilyblow otf the sediment which may fall on the crownsheet 12. The crown-sheet 15 of the upward extension 5 of the fire-box is located below very shallow water, for in practice the waterline of the boiler willcome above the level of the cylindrical portion 2) of the boiler-body. In Fig. 1V it is seen that the semicylindrical crown-sheet 15 has an internal convexity extending into the waterspace of the boiler, so that when the blow-olf cock 12L is open the flow of water carried from above downward to the cook 14 will have a tendency to wash the sediment, ifany,lfrom the crown-sheet. The lower semicylindrical crown-sheet 12 is inwardly concave for a like purpose, so that when the blow-off cock 14 is open the flow of the water in the boiler down the sheet 12 will carry the sediment, if any, down into the water-leg and to the blow-01f cook.

16 indicates the furnace-door, and 17 the grate-bars of the usual type. The fire-box is greatly elongated between the furnace-door 16 and the upward extension 5 and is surrounded at the top and sides of such elongated portion with the water-leg 3, so that the fire-box is approximately inclosed in said water-leg.

18 indicates the steam-pipe leading from the steam-dome. This pipe may be located at any suitable place.

The steaming capacity of the boiler is made very great by the feature of construction shown, in which the fire-box is so extended and so inclosed by the water-chamber of the boiler, and the heating-surface is greatly increased by this construction. Furthermore, a large body of dry steam is provided for by the upward extension of the firebox to nearly above the water-level of the boiler.

' It is to be understood that the water-level may be varied within the judgment of the engineer, and it will also be understood that the correct practice is to allow the Hues and fire-box to be always submerged in the water.

In ascending or descending practical grades the surfaces with which the fire comes into contact will remain below the water-level19, the steam-dome beingonly over a central portion of the boiler and the body of water being sufficient to cover the parts with which it comes in contact.

The smoke-box 7 is surrounded at the sides by the water-space 20 of the boiler, so that the heat which passes through the tubes 10 into the smoke-box will be largely utilized in producing steam. The upward extension 2 slopes rearwardly up from the cylindrical body I), so that the steam readily passes up into the steam-dome c. The greatest steamspaceis immediately above the portion of the fire-box where the greatest heat is applied, so that there is as little friction and loss of power possible in the movement of'the steam from the place of its most rapid generation to the steam-space c-that is to say, said steam-space c is immediately above an enlargement of the fire-box and above that portion of the tubes which receives the hottest name.

The fire'box comprises the trunk d, the upward extension 5, and the forward extension 6, all within the water-space of the boiler. The trunk d is preferably of considerable length for the purpose of economically burning straw.

In practice the fuel will be fed into the furnace in the-ordinary Way, and the heat is taken up by the contents of the main shell and the water-legs of the boiler which approximately surround the fire-box and the smokebox.

I believe that a boiler provided with a tirebox com prising a trunk and a forward extension and an upward extension intermediate the fire-box trunk and the forward extension and a water-legaround the sides and top of the trunk and at the sides of the extension and above the front of the extension is novel. I also consider that a boiler having a fire-box furnished with a semicylindrical crown-sheet extending rearward from above the tubes of the boiler and also provided with a semicylindrical crown-sheet extending in a forward direction underneath the rear portion of said tubes is a novelty in the construction of boilers. The fire-box trunk, with the forward extension and the upwardly-extending chamber thereof, constitutes a fire-box which is es pecially adapted for the burning of straw or similar material and allows of perfect combustion, and the water-legs therearound are adapted for the absorption of the heat generated from the combustion of such materials. "The arrangement of the semicylindrical crown-sheet extending rearwardly from above the tubes of the boiler allows any sediment which may collect thereon to be readily drawn downwardly along the sides of the crown-sheet when the blow-off valve is opened,

upward extension of the fire-box, I provide a boiler which, having a steam-dome interme- 5 diate its length and above the fire-box, has at all times a covering of water over the fire-box (when a sufficient supply of water is in the boiler) whenever the boiler is ascending or descending any reasonable grade, thereby preventing the danger or liability of burning the crown-sheet. This feature I do not believe to have been used in a traction-engine boiler before my invention.

What I claim, and desire to secure by Letters Patent of the United States, is

1. A boiler provided with an elongated water-leg having a fire-box therein, said box being provided with a vertical extension inter mediate its ends, and tubes or fiues leading from said extension through the boiler.

2. A boiler provided with an elongated wator-leg and having a fire-box therein, said box being provided with a vertical extension intermediate its ends, the top of the rear end of the box being substantially horizontal and convex and the top of the forward portion being inclined and concave.

3. A boiler provided with an elongated water-leg and having a fire-box therein, said box being provided with a vertical extension intermediate its ends, the boiler being provided with a blow-off cock substantially midway of its width and on a line with the bottom of the water-leg, the top of the rear portion of the fire-box being convex and the forward end being concave and inclined toward the blow-0E cock.

4. A boiler provided at its rear end with a vertical extension and a rearwardly-projecting water-leg, a fire-box in the water-leg, the top of which is provided with a vertical extension intermediate its ends, the top of the fire-box extension terminating at a distance below the top of the boiler extension, and the sides and top oft-he fire-box lying adjacent to the sides and top of the water-leg and the sides of the vertical extension lying adjacent to the sides of the boiler, whereby a rapid circulation of water and generation of steam is effected.

5. A boiler provided with a cylindrical for- Ward end and a vertical extension and an elongated water-leg at the rear end, the vertical extension being above and the water-leg being below the level of the main portion of the boiler; a smoke-box in the forward end, a fire-box within the water-leg, the walls of which lie adjacent to the walls of the waterleg and the top provided with a vertical ex tension intermediate its ends, the top of said extension being at a distance below the top of the boiler extension, and fire-tubes from the top of the fire-box extension to the smokebox, the dues occupying the main part of the tubular portion of the boiler, whereby the water-space at the center is greater than at either end.

6. A boiler provided with a cylindrical forward end and a parallel-sided vertical extension and an elongated water-leg at the rear end, the vertical extension being above and the water-leg below the level of the main portion of the boiler, the width of the boiler, the extension and the water-leg being the same and the height of the boiler through the rearend of the vertical extension and the forward portion of the Water-leg greatly exceeding the width of the boiler, and a fire-box in the water-leg, the top of which is provided with a vertical extension intermediate its ends, the top of the fire-box extension terminating at a distance below the top of the vertical boiler extension.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, at San Jacinto, in the county of Riverside and State of California, this 1st day of August, 1901.

CLARENCE ELMER CHAMBERS.

Witnesses:

J. FRED HARDS, NICHOLAS GLENN.

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