US451322A - Steam-boiler - Google Patents

Description

3 Sheets-Sheet 1. S. FOWDEN. STEAM BOILER (No Model.)

Patented Apr. 28, 1891.-

' 3 Sheets-Sheet 2. S. PO'WDEN.

STEAM BOILER.

(No Model.)

No. 451,322. Patented Apr 28, 1891.

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(No Model.) 3 Sheets-Sheet a. S. FOWDEN.

STEAM BOILER. No. 451,322. Patented Apr. 28, 1891.

NITED STATES ATENT Enron.

SAMUEL FOWVDEN, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-BOILER.

. SPECIFICATION forming part of Letters Patent No. 451,322, dated April 28, 1891.

Application filed July 28, 1890. Serial No. 360,235. (No model.) I

To all whom it may concern:

Be it known that I, SAMUEL FoWDEN, a citizen of the United States, and a resident of Philadelphia, Pennsylvania, have invented certain Improvements in Steam-Boilers, of which the following is a specification.

One object of my invention is to so construct a steam-boiler as to provide an extended heating-surface, both external and internal, a further object being to insure the effective combustion of the gases arising from the fuel in the fire-place. These objects Iattain in the manner hereinafter set forth, reference being had to the accompanying drawings, in which Figure 1 is a longitudinal section of a steamboiler constructed in accordance with my invention. Fig. 2 is a front view of the same, partly broken away. Fig. 3 is a transverse section on the line 1 2, Fig. 1; and Fig. 4 is a longitudinal section, partly in elevation, of a modified form of my improved boiler.

The boiler shown in Figs. 1, 2, and 3 has opposite water-chambered side walls A A, water-chambered front and rear walls B B, and upper and lower tubed barrels D D, each of these tubed barrels communicating at the ends with the water-chambered front and rear walls of the boiler, as shown in Fig 1. The tubes at of the lower barrel D extend from the outer casing d of the front wallB to the outer casing cl of the rear wall 13, the rear ends of these tubes a communicating with a dischargefiue or stack F at the rear of the boiler. The front ends of the tubes to communicate with a chamber G, contained within a casing G,secured to the front wall B. The tubes 1) of the upper barrel D of the boiler also communicate with this chamber G, and the rear ends of the said tubes communicate with a chamber H, formed at the rear end of said upper barrel D, this chamber II also communicating with the space between the two barrels of the boiler, as shown in Fig. 1. The shells of the upper and lower barrels D D do not extend to the side walls A A of the boiler, so that the products of combustion from the fire-place I beneath the lower barrel D can rise around the same and partly around the shell of the upper barrel D, as shown in Fig. 3, the escape of the products of combustion between the sides of the upper barrel and the side walls of the boiler being prevented by suitable filling-blocks f, as also shown in Fig. 3. The products of combustion therefore rise around the lower barrel D, so as to envelop the same and partly envelop the upper barrel D, said products of combustion seeking the chamber H at the rear of said upper barrel D and passing thence through the tubes 1) of said upper barrel, through the connecting-chamber G, and through the tubes at of the lower barrel to the discharge line or stack F. The heating-surface thus presented therefore comprises the entire shell of the lower barrel, the greater portion of the shell of the upper barrel, the tubes of both barrels, both the inner and outer shells of the front and rear walls of the boiler, and the inner shells of the side walls of the same.

Extending through the front wall B of the boiler from the oombustion-chamber J v to the connecting-chamber G are fines K, through which a portion of the products of combustion can pass directly from said combustionchamber J to the chamber Gr without passing through the tubes of the upper barrel D. Hence the products of combustion following this course are highly heated and serve to reignite the products of combustion which have been extinguished in their passage through the tubes of said upper barrel. By this means a practically perfect combustion of the gases arising from the fuel is effected. The tubes b of the upper barrel of the boiler are of larger diameter than those of the lower barrel, in order to prevent the sudden extinguishing of the products of combustion on entering said tubes 1), it having been found that said products will, in traversing a large tube, remain ignited for a longer time than when traversing a small tube. In the lower barrel of the boiler, however, this is not of so much consequence. Hence the tubes at are of small diameter, in order to insure the maximum heating-surface in said lower barrel.

In Fig. 4 I have shown my invention as applied to a boiler set in masonry or brick-work,-

instead of having water-jacketed walls. In

this case the upper and lower barrels of the boiler are connected by necks m, and the tubes of the upper barrel D of the boiler extend completely through the same, the upper portion of the flue F at the rear of the boiler being separated from the lower portion by a slab n, so that the products of combustion first seek the upper portion of the flue, then pass through the tubes of the upper barrel, through the chamber G, and through the tubes of the lower barrel to the lower portion of the flue F, from which they escape through a dampered opening F to a lateral discharge-flue F behind the bridge-wall. An opening K is formed in the front supporting-wall of the boiler to serve the same purpose as the flues K in the structure shown in Figs. 1, 2, and 3. In this boiler, also, I prefer to locate in the fire-arch M a coil of pipe 19, communicating with the lower barrel D of the boiler and sei'ving as a feed-water heater.

In some cases the tubes in the lower barrel D may be dispensed with and the products of combustion permitted to escape from the top of the chamber G; or, on the other hand, the.

tubes in the upper barrel may be dispensed with and all of the products of combustion caused to pass through the fiue or fluesK and thence through the tubes of the lower barrel. It is preferable, however, to provide both barrels of the boiler with tubes, as shown.

I am aware of the French patent, No.139,909, granted November 26, 1880, to A. M. Delpech for a steam-boiler having upper and lower tubed barrels so mounted that the products of combustion are first passed partly around the lower and upper barrels, then through the tubes of the upper barrel, and finally through the tubes of the lower barrel; but such boiler was used in connection with a double fireplace and dividing-wall, whereas in my improved boiler there is a single fire-place directly beneath the lower barrel of the boiler and the products of combustion entirely surround the latter, and my improved boiler also differs from that set forth in the French patent in a number of other details of construction.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. The combination of the upper and lower barrels of the boiler, tubes orfiues in said upper barrel, an outer casing supporting the boiler at the ends and inclosing a combustion-chamber, and a fire-place, the latter being directly beneath the lower barrel of the boiler and the combustion-chamber surrounding said lower barrel and extending part way around the upper barrel and communicating with the tubes of said upper barrel at the rear ends of the same, substantially as specified.

2. The combination of the upper and lower barrels of the boiler, tubes in said lower barrel, anouter casing supporting the boiler at the ends and inclosing a combustion-chamber and a fire-place, the latter being-directly beneath the lower barrel of the boiler and the combustion-chamber surrounding said lower barrel and extending part way around the upper barrel, a casing inclosing a chamber through which the products of combustion can pass from the combustion-chamber to the tubes of the lower barrel, and a casing inclosing a discharge fine or stack, substantially as specified.

3. The combination of the upper and lower barrels of the boiler, each having tubes, an outer casing supporting the boiler at the ends and inclosing a combustion-chamber and a fire-place, the latter being directly beneath the lower barrel of the boiler and the combustion-chamber surrounding said lower barrel and extending part way around the upper barrel and communicatingwith the tubes of said upper barrel at the rear ends of the same, a casinginclosing a chamber which connects the tubes of the upper and lower barrels, and a casing inclosing a discharge fine or stack com municating with the tubes of thelower barrel, substantially as specified.

4. The combination of the upper and lower barrels of the boiler with a casing inclosing a combustion chamber which surrounds the lower barrel and extends part way around the upper barrel, said casing having water-chambered front and rear walls communicating with the barrels of the boiler, substantially as specified.

5. The combination ofthe upper and lower barrels of the boiler with a casing inclosinga combustion chamber which surrounds the lower barrel and extends part way around the upper barrel, said casing having opposite water-chambered side walls and water-chambered front and rear walls which communicate with the barrels of the boiler, substantially as specified.

6. The combination of the upper and lower tubed barrels of the boiler, acasing inclosing a combustion-chamber which surrounds the lower barrel, partly surrounds the upper bar rel, and communicates with the tubes of the same, said casing having water-chambered front and rear walls, a connecting-chamber casing on the front wall, and. a dischargeflue casing on the rear wall, substantially as specified.

7-. The combination of the upper and lower ICC tubed barrels of the boiler, a casing inclosing a combustion-chamber which surrounds the lower barrel, partly surrounds the upper barrel, and communicates with the tubes of the same, said casing having water-chambered front, rear, and side walls, a connecting-chamber casing on the front wall, and a dischargeflue casing on the rear wall, substantially as specified.

8. The combination of the upper and lower tubed barrels of the boiler, a casing inclosing aconnecting-chamber at t-hefront of theboiler, and a casing which incloses a combustionchamber surrounding the lower barrel of the boiler and communicating with the tubes of the upper barrel, said chamber also communicating directly with the connecting-chant her at the front of the boiler, substantially as specified.

9. The combination of the upper and lower barrels of the boiler, each having tubes, and the tubes of the upper barrel being of larger diameter than those of the lower barrel, a

5 casing inclosing a chamber which connects the tubes of the upper and lower barrels, a casing inclosing a discharge flue or stack, and a casing inclosing a combustion-chamber which surrounds the lower barrel of the boiler and 10 extends part way around the upper barrel of the same, said combustionchamber communicating' with the tubes of the upper barrel, substantially as specified.

In testimony whereof I have signed my name to this specification in the presence of 15 two subscribing witnesses.

SAMUEL FOWVDEN.

Witnesses:

EUGENE ELTERICH, HARRY SMITH.

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