US552754A - Steam-boiler - Google Patents

Description

(N0 Model I) 3 Sheets-Sheet 1.

M. S. POOTE.

STEAM BOILER.

No. 552,754. Patented Jan. '7, 1596.

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$TEAM BOILER.

Patented Jan.57 1896.

(No Model) IMGVZZOZ'.

UNITED STATES PATENT QFFICE.

MARK S. FOOTE, OE BURLINGTON, IOXVA.

I TEA -BoIL R.

PECIFICATIO forming part of I etters r atent No. 552,754, dated January 7, 1896.

' Application filed lfovember 12, i895. Serial No. 568,709. (No am.)

To wZZ whom it may concern: Be it knownthat I, MARK S. Foorn, ofBur-f lington, in the county of Des liloines and State of Iowa, have invented a new and use- I by a boilerand furnace of simple construction and one that requires comparatively little attention. I

'The principal results secured by this in-. vention are large area of heating surface without complicating the construction or multiplying parts and thorough consumption of the fuel, economizing in coal and reducing the amount of soot and smoke; l

The principal parts of the boiler are sustained by an outer shell, preferably cylin-, drical, from which is suspended interiorly a magazine constructed and connected with the outer shell in such manner as toform three horizontal heating-heads. The magazine is double-walled, forming between thetwo walls a water-chamber. Between this and the second water-chamber is an annular combustionchamber communicating at the top with a flue formed between the outer shell and the brick inclosure. The products of combustion pass down this flue in contact with the outer shell, pass around the bottom of the latter into a similar flue on the other side thereof, and rise through this flue to the chimney. An air-box is placed in each of these lines, provided with a passage through the outer water-chamber, the heated air entering the annular flre-chamber at about the point of final combustion, whereby the smoke is largely consumed and the heating effect increased.

The invention will be fully comprehended from the following detailed description, reference being had to the accompanying drawings, wherein- Figure 1 is a central vertical section. Fig. 2 is a similar view on a plane at right angles to Fig. l, and Fig. 3 is a horizontal section on line g y.

The outer shell A is preferably cylindrical in form, and with the inner shell 13 forms an annular water-chamber a and a steam-dome 1). The magazine is formed of the two walls 01), between which is a second water-chamber c. The magazine is suspended from the shell or casing B by means of a ring E, which, as shown, is flanged and riveted to the casing at one end and to the magazine at the other. This ring forms a steam-passage from the inner water-chamber or section a to the steam-dome b, the water-level in the latter being indicated by the line 5c 00. A manhole-cover is provided for access to the interior of the boiler. The inner chamber or boiler-section c is separated from the outer section a by an annular space d, which is a combustionchamber and flue for the passage upward of the products of combustion. This space is crossed by the fuel chute or hopper H, which leads .to the side of the magazine, and by a pipe I,

which connects the water-chambers aand c.

The heated products of combustion, rising through the annular space or flue d, collect in the chamber 6 between the heating-heads b and c. The third heating-head is formed by the top plate cl of the magazine. All these parts, as well as the riveted joints of suspending-ring E, are protected by water, which, as indicated, stands at the level of the line 00.

The construction and arrangement of the grate G and the ash-pit present no peculiarities.

The furnace is inclosed in brickwork K, which at the front and back of the furnace is set in close contact with the shell A, but at the sides is clear of the shell, thus forming two flues L L, each nearly half the circumference of the boiler. The vertical brick partitions 70, which separate these flues, rest upon the cast-iron boxes M, which form communications between the two flues. The gaschamber e connects, as shown in Fig. 2, with the upper end of flue L, and the gases spread through the latter in contact with nearly onehalf the surface of shell A and pass downward. From the bottom of flue L they pass around the lower part of shell A through the passages M into the flue L, and passing upward through the latter they heat the other side of shell A, after which they pass to the chimney through outlet N.

In each flue L L is placed a hot-air box P,

having a space around and between it and the brickwork for circulation of the hot gaseous products of combustion, whereby the air, entering the box at P, is heated and caused to ascend. A pipe 13 extends through the waterchamber a and delivers the air into the combustion-chamber d at a point above the lower edge of the magazine, so that combustion at this point is aided and greater heat developed. Although air is shown entering the combustion-chamber at two points, the number of air-inlets may be varied, and other changes may be made in details of construction without departing from the spirit of the invention.

The boiler may be used for hot-water heating as well as for steam-heating, and its construction is such that while specially advantageous for burning soft coal it may also be used with hard coal. The only surface upon which soot can deposit, and where it will not be burned off? or detached by the action of the flame, is the head 0. This head, however, is on the level of the passage c, Fig. 2, between the gas-chamber c and line L. Consequently by forming an opening q through the brick work in line with said passage access maybe had to the surface of head 0 for cleaning.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination of the outer annular boiler-section forming the shell of the 111 nace; the inner section and magazine suspended from the former by a ring which also forms a communicating steam passage, there being an annular combustion chamber between the two sections, leading to a gas chamber surrounding the suspending ring; a brick inclosure forming a chamber around the shell separated by vertical partitions into two flues, one of which communicates at the top with said gas chamber and the other with the chimney; and horizontal passages connecting said flues at the bottom, substantially as described.

2. The combination of the outer annular boiler-section, the inner annular section and magazine, the suspending ring forming with the walls of said sections a gas-chamber, and a brick inelosure forming a flue outside the outer section communicating with said chamber by a passage in line with the level of the top-surface of the inner section, the brick inclosure being provided with a horizontal opening in line with saidpassage, substantially as described.

3. The combination of the annular boilersection surrounding the fire-box and combustion chamber, the inner section suspended therefrom and forming the inner wall of the annular combustion chamber and the magazine, the brick-work forming flues outside the outer section, and a hot air-box in one of said flues, communicating with said combustion chamber at a point above the lower edge of the magazine, substantially as described.

4. The combination with the annular boilersection surrounding the fire-box and combustion chamber, and the brick-work, forming flucs on opposite sides of said section, these fiues being connected as specified, of a hotair boX in each flue around which boxes the products of combustion circulate, and airducts passing through said boiler-section to the combustion chamber, substantially as described.

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

MARK S. FOOTE.

\Vitnesses A. O. I-IUTcrn-NsoN, F. GonDEcKE.

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