US373139A - Air-injector for furnaces - Google Patents

Description

(No Model.)

HUTGHINSON.

A-IR INJECTOR FOR FURNACES.

' Patented Nov. 13, 1337.

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WILLIAM S. HUTCHINSON, OF CHICAGO, ILLINOIS.

"AIR-INJECTOR FOR FURNACES.

SPECIFICATION iorm lngpart' of Letters Patent 0. 373,139, dated November 15, 1887,

To all whom itmay concern.

Be it known that 1, WILLIAM S. HUTOHIN- SON, a citizen of the United States, residing at Ohicago,in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Air-Injectors for Furnaces, which are fully set forth in the following specification.

My invention relates to devices for increasing :0 the draft of furnaces,"supplying them with air, and aiding the combustionor decomposition of the gas or smoke which arises from them; The objects of my invention are to decrease the noise caused by the air and steam, and to provideacombined T and steam-supply nozzle. I accomplish these objects by the means illustrated in the accompanying drawings, where- 111- Figure l is a side view of a locomotive-boiler with my invention attached and parts broken away. Fig. 2 is an end view of same. Fig. 3 is a sectional view of a steam-nozzle, airglobe, and connecting parts. 7

Like parts are indicated by the same letter throughout the drawings.

A is a boiler,- B, the steam-dome; O, the smoke-stack; D, the furnace; E, an ash-pan; F, asteam-pipe leading from the steam-dome along the head of the boiler, thence forwardly 0 along the boiler, and terminating in a steamnozzle which discharges into the base of the smoke-stack. H is a valve which controls this 1pc. p J J are transverse pipes along the front and 5 rear of the furnace, formed by short sections and the Ts, K, from which project the steamnozzles L. x M is ajet-tip,of non-corrosive metal, screwthreaded into or otherwise attached to the noz- 0 zle L. O is a shoulder on the inside of the tip, and P shoulders on the interior of the nozzle, whereby the passage-way of the nozzle and tip gradually increases from the T to the discharge end, as shown in Fig. 3, where it will be seen 5 that,by reason of these shoulders or offsets of the interior of the jet, the same is successively diminished in size from left to right.

It is an air-globe having the apertures S about its side and being screw-threaded on the nozzle at T by aright-hand thread,and screw-threaded on the nippleV by aloft-hand screw-thread, U.

W is a cushion about the mouth of the airpipe X, which leads from the globe B. This cushion is composed of any kind of sounddeadening or non conducting substance, as lead. The nipple Vpasses through the flue Y and opens into the furnace. The flue Y is protected from cold-air drafts by the collar Z, which covers its ends. The flue, being thus protected from sudden and excessive changes of temperature,is comparatively free from the danger of being loosened.

My invention operates after the manner of an air-injector. The area of the dischargenozzle is about one-tenth of an inch, and the area of the air-pipe about the dischargetip is aboutone and one-fourth of an inch, and by this arrangement I discharge into the furnace, through each air-globe and'air-pipe, about two hundred times as much air as the steam discharged through the steam-nozzle and tip.

Theuse and operation of my invention areas follows:

I have shown my invention as applied to a locomotive furnace'and boiler, though it may .be applied to various uses. The steam-pipe leads from'the steaindome down along the head of the boiler. At a proper point it sends off abranch pipe to supply the upper row of rear airinjectors, and this pipe also proceeds down to supply the air-injectors which open into the ash-pan. The steam-pipe then proceeds forward until it sends off another branch pipe to supply the front air-injectors. The steampipe continues its course until it reaches the interior of the smoke-stack, where it terminates in a jet which assists the draft.

The air-injectors are arranged in rows along the sides of the furnace, and each is constructed as shown. The steam passing out through the steam-jet tip, having the interior structure as shown, has the greatest possible power of supplying air. The air is drawn in through the apertures in the side of the air-globe, and the sound usually made by it is greatly decreased or nearly deadened by the cushion in the interior ofthe globe. About the mouth of the airpipe, which leads from the air-globe and into which the steam-nozzle discharges, is placed this cushion or non-conductor of sound. Many different substances could be used. I have found lead to work very well. This cushion receives the current of air and deadens the sound which it makes when passing over the unprotected surface of the air-pipe. The shape of this cushion also facilitates the supplying of the air. When the supply of steam is out OK, a certain quantity of steam, water, or moisture is left in the steam-tip, and corrosion would follow were it not for the non-corrosive material used. The threads on the ends of the airglobes are the one right and the other left, so that one globe can be inserted or removed without disturbing the remainder. The Ts are cast with the nozzles projecting or formed continuous therewith. The steam discharged through the various tips operates, in the man near of an injector,to inject a large quantity/of air into the furnace through the globe and the pipe into which the tip projects. This latter pipe in the illustration passes through a fine, which in turn passes through the waterspace about the furnace, and lhe globe and T extend outwardly from the end thereof. The collar about the globe covers up the connection between the globe and the fine. thus excluding air from the flue. Any quantity of steam can be discharged through these nozzles, and the discharge thereof draws large quantities of air into the furnace to assist the draft. consume the smoke, and increase the heat. The area of the steam-discharge aperture is one-tenth ofan inch, and of theair-pipc about the same is one and one-fourth of an inch. The steam -j et in the smoke-stack keeps up a draft, so as to keep the fire or heat from pulling out behind, which it sometimes does when the draft is clogged and the air-injectors are at work.

The discharge-tip is made of what is known as steam metal and alloy or compound, and which is manufactured and sold in Chicago and elsewhere.

I claim-- 1. A steanrnozzle for an air-injector, provided with a tip having an interior shoulder, in combination with a T continuous therewith.

2. An air'globe for an air-injector,provided with a sound deadening cushion about the mouth of the air-supply pipe.

3. An air-globe provided with an air-pipe and a sound deadening cushion about the mouth thereof, in combination with a steamnozzle which discharges through the air-pipe.

4. An air-globe having side apertures, an airpipe, and a sound-deadening cushion about the mouth of the latter, in combination with a nozzle which is screw-threaded into one end of such globe and passes through the same and discharges into the air-pipe.

5. The combination,with a steam boiler and furnace, of a steam -pipe leading from the stean1-doine,aseries of air-injectors at the front and rear of the furnace,discharging above and below the grate-bars, and a steam-jet toward the forw ard part of the boiler and immediately below the smoke-stack, all of the said air and steam injectors being supplied with a constant current of steam from the said steam-pipe for the purpose of supplying the air to the fire, causing the hot gases to be burned before they leave the furnace, and preserving a constant draft through the smokestack.

In testimony whereof I have hereunto set my hand, in the presence of two witnesses, at Chicago. Illinois, this 10th day of November, A. D. 1886.

WILLIAM S. HUTGHINSON.

Vitnesses:

FRANCIS W. PARKER, G. G. JACKSON.

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