US286695A

US286695A - Steam-boiler

Info

Publication number: US286695A
Authority: US
Publication date: 1883-10-16
Anticipated expiration: 1900-10-16

Description

(No Model.)

D. MOB. GRAHAM.

'STEAM BOILER No. 286,695. Patented Oct. 16, 1883.

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UNITED STATES PATENT O FICE.

DANIEL MOB. GRAHAM, OF CHICAGO, ILLINOIS;

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 286,695, dated October 18, 1888. Application filed February 23, 18ers. (No model.)

To all w/wm it may concern:

, Be it known that I, DANIEL. MCBRIDE GRAHAM, of Chicago, 'in the county of Cook, of the State of Illinois, have invented a new and useful Improvement in Steam-Boilers and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of which Figure 1 is a longitudinal and median section, and Fig. 2 atransversesection, of a steamboiler provided with my invention, the nature of which is defined in the claim hereinafter presented. The plane of section of Fig. 2 is through the branched conduit of the air-distributing ring, as explained.

The boiler is a multitubular one, such as is in common use in locomotive steam-engines, its fire-place being at A, grate at B, tube-stack at O, smoke-chamber at D, chimney at E, and outer shell at F. The bars a of the grate are tubular, each of them, nearits rear end, opening into a flaring mouth-piece, 1), extending along underneath the set and open toward the front end of the engine. Each tubular grate-bar, at or near its front end, opens into a receiver or box, G, extending across the set i at the back of the fire-chamber, such tube being closed at its ends.

From this tube a branched conduit, H, leads, and opens communication between the receiver G and a ring, I, arranged directly in rear of and with respect to the receiving-mouths of the tubes of the stack, in manner as represented, this ring having numerous holes made in it at its inner periphery, the obj eet of the said tube being to receive and discharge airinto the combustible smoke and gases just previous to their passage into the several tubes, the'same being to promote and facilitate the combustion of such smoke and gases, and thereby not only utilize them to advantage in heating the tubes,but preventing deposits from them being made in the tubes or smoke-box. The flaring mouthpiece b extends underneath all the grate-bars, and serves not only to conduct air into them,but as a support for them, they at their rear ends being supported by the receiver G, which extends across and is fastened to them. The gratebars are open at their front ends, and should be there provided with one or more covers or draft created in the stack, and will pass intoand through the hollow grate-bars, thence into the receiver, thence into and through the branch conduit, thence into the ring and out of its perforations, the air passing through the grate-bars preserves them in a measure from destruction by the heat of the fire on them, and becomes heated by them, and thereby facilitates combustion of the gases and smoke.

I do not claim, in a tubulargrate, each of its bars provided with a mouthpiece separate from that of each of the other bars. I have a single mouth-piece to all the grate-bars, it extending across and under them at their outer ends, and serving to support them and to better supply them with air. I would remark that by having the branched conduit H to lead from the receiver G to the ring I communication with the ring from either half of the gratebars may be maintained, while the others may be opened at their rear ends for being cleaned. I do not herein claim the arrangement,in a firebox, of an arched or perforated firc-brick annular casting to receive air and discharge it into the throat of the said fire-box, and to open to the atmosphere by a short conduit leading downward from it through the shell of the boiler of such fire-box.

I claim In the multitubular boiler, the combination of the tubular and perforated ring I, arranged with the tube-stack, as described, the branched conduit H, the receiver G, the series of tubular grate-bars a, and the mouth-piece I), extending across and under such bars and serving to support them and supply them with air, as explained.

DANIEL MQBRIDE GRAHAM.

\Vitnesses:

R. H. EDDY, E. B. PRATT.