US365971A

US365971A - Steam-boiler

Info

Publication number: US365971A
Authority: US
Publication date: 1887-07-05
Anticipated expiration: 1904-07-05

Description

A. M. OOYLE.

STEAM BOILBR.

(No Model.)

NO. 365,971. Patent'ed July 5, 1887.

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ANDREV M-. COYLE, OF VASHINGTON, DISTRICT OF COLUMBA, ASSIGNOR TO W. B. DUNNING, OF GENEVA, NEVV YORK.

STEAM-BO'ILER.

SPECIFICATION forming part of Letters Patent No. 365,971, clatel July 5, 1887.

Application] filed May 25, 1887. Serial No. 239,319. (No model.)

To aZZ wii/0171, it may concern:

Be it known that I, ANDRW M; CoYLE, of Vashington, in the Districtof Columbia, have invented certain newl and useful Improvements in Stcanrloilers, of which the following is a specification.

This invention relates to steam boilers of that class in which the products of combustion .are eompelled to pass downward in their transit from the fire-box to the' smoke-fine; and the invention consists in providing means fora direct draft, as hereinafter described.

Fignre 1 is a ,Vertical central section of a boiler and its setting with my improvement, applied thereto. Fig. 2 is a perspect-ive view of the fire-door case, shown detached, with my improvement applied thereto.

My improvement is designed to be applied more especially to what is known as the Dunning boiler, which is extensively used for heating buildings, and the construction of which is so well known that adetailed descrip' lion is deenied unnecessary. There are, however, other boilers of a similar Character to which my invention may be appliedlwith equal facility and advantage.

As is well known, and as shown in Fig. 1, the Dunning boiler is made in an upright form, with the fire-box located centrally within the body of the boiler at its lower portion, and with a fuel reservoir or magazine, M, located centrall y within the upper part of the firebox.

In the drawings, Fig. l, B indicates the boiler, O the grate, M the magazine, and A the brick-work within which the boiler is set.

H indicates a rectangular casing set in the brick-work at the frontandproj ect-ing through the side of the boiler to the fire-box, this casing heretofore having been made with tight walls or sidcs and With a fire-door, F, hinged at its enter end, so it can be opened to get at the fire within the boiler whenever necessary, and which is also provided with a valve, e, for the admission of air to mingle with the gases arising from the burning coal, in order to secure a more perfect combustion of the gases. As Originally constructed the products of coinbustion first passed upward within the fire-box, then down through a series of Vertical tubes, n, and thence up through the space between the outside of the boiler and the surrounding brick-Work, as indicated by arrows on the right-hand side of Fig. 1, until intercepted by the horizontal wall or diaphragm b, which deflects them and causes them to pass around the sides ot' the boiler to the front, where an opening is left in the diaphragm b, through which they pass, then divide and pass back around opposite sidcs of the boiler to the outlet or smoke fiue T, which is connected with the ehimney in any 'convenient manuer. Experience has shown that while there is no difficulty'in inducing the smoke, dnc., to 'follow this circuitous route after the fire is well under way and the chimney and all the parts have become heated, so as to create a good draft, still there is difficulty when the tire is first started, and when of course the boiler and all the fiues are cold. Various plaus have been devised to obviate this difliculty,'such as extending/a smoke flue from the fire-box up through the top of the boiler, and also in making an opening through the side of the boiler at the upper edge of the fire-box, as shown in the Patent to NV. B. Dunning, September 28, 1886, No. 349,699; but these plans require a change in the construction of the boiler itself, and as these parts must be made steam-tight they add more or less to the cost of the boiler. To ebviatethese objections, and at the same time provide a direct draft that will accomplish the desircd result and at less cost, Isimply make an opening, I, in one of the walls of the cast-iron case or box, H, at S 5 a point coincident with the space between the boiler and the brick-work, as shown in Fig. '1, and provide a sliding plate or daniper, J, by which said opening can be closed or opened at will. In Fig. 1 I have shown the slide J go `arranged on the inside of the box or case H, f and it may be provided with asmall rod or handle, a, projecting out through the flange at the front or outer end of the case H, as shown in Fig.l 2. As, however, the case H is provided with a door, F, at its front that can be opened, it isiobvious that the rod a maybe dispensed with and the slide be moved by the hand or by a poker. In Fig.2 I have shown the slide J arranged on the outside 1:00 of the case H, in which case the haudle a will be necessary, although, if preferred, the

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slide J may be provided with a lug or projection on its under` side and made to project down through a slot made in the upper wall of the case, so that it can be moved from the inside of the case the same, as when arranged as in Fig. 1, these being mere matters of detail for the choice of the constructor, it only being necessary' that it be provided with means for moving the slide J forward or 'back at will. It will be obvious that theopening I may be made in the side walls of the case H, either in one or both, and operatejust the same; but I prefer to make it in the top wall, as it is a little more in the direct line of t-he draft.

This improvement is equally applicable to the surface--burning Dunning boiler, which is the same in construction, exeept that it has no magazine, but has the Vertical tubes and smoke-passages the same, and 'has the front fire-door and case the same. So, too, it is applicable to any style of Vertical boiler which has a reverse draft and a front fire-door-and case, and which are common in various boilers of this general Character, of which several styles are now made. It will at once be seen that. this improvement requires no change whatever in the'boiler itself, and that the additional cost is a mere trifie, it only being necparts, including the brick-work, remaining precisely as they were before' It is common with the smaller sizes of these boilers to substitute a Sheet-metal casing for the brick setting, but that of course will make no difference With this improvement, it being applied to them in the same inanner pr'ecisely.

Having deseribed myi nvention, what I clairn 15-- 1. In combination with a steam-boiler, substantially such as described, the` case H, provided with the opening I, and a slide or damper, J, for closing the same, substantially as and Vfor the purpose set forth.

2. The combination, with a Vertical boiler having a fire-box Within it and tubes or passages through which the products of combustion normally pass downward before they reach the exit or smoke-fiue, of the case H, extending through the side of the boiler to the fire-box within, said case being provided with a direct-draft opening arranged to eoincide with the outer smoke-passage, and a damper for closing the same, substantiallf,7 as shown and described.

In witness whereof I hereunto set my hand in the prcsence of two witnesses.

I ANDREW M. COYLE.

Vitnesses:

W. C. DODGE, ARTHUR AsHLEY.