US1522232A - Locomotive exhaust pipe - Google Patents

Description

Jan. 25 ff. 1,522,232 I s. H.'DUNNING Locomo'rivm EXHAUST FIRE I i l a 1924 2 Sheets-She'i l of Paterson, in thecounty of Passaic and- Patented Jan. 6, 1925. V

UNITED/STATES SAMUEL H. nunnme, or rafrnnson, new

'LOCOMOTIVE EXHAUST PI'PEQ Application-filed January 21, 1924. Serial No. 687,661;

To all whom it may concern:

Be it known that I, SAMUEL H. DUNNING,

State of New Jersey, have invented a certain new and useful Improvement in Locomotive Exhaust Pipes, of which improvement the following is a specification.

My invention relates to means-for discharging the exhaust steam and gaseous products of combustion from the smoke boxes of locomotive or. other boilers operated under forced draught, and? its objectis to provide an appliance, in the operation of which the exhaust steam and the smoke box gases will be more completely and effectively commingled than heretofore,

and the back pressure be reduced to a lower degree than in ordinary practice.

The improvement claimed is hereinafter fully set forth. 7 I

The discharge openings of the nozzles of locomotive exhaust pipes have, in some cases, been made of an'irregular or eccentric form for the purpose of increasing the entraining surface of the steam jet, and, in other cases, the. exhaust steam has been discharged through an annular passage, surrounding an opening through which a portion of the smoke box gases was discharged, but the ratio of the discharge area of the steam jet to its surrounding surface has not, in practice, been found sufficiently small to produce the maximum entraining effect.

My invention is designed to attain this effect by the provision of a plurality of gas ducts, leading into the steam discharge pas sage of the exhaust pipe, so as to penetrate the body of the exhaust steam jet, whereby an appreciable portion of the smoke box gases is delivered in comparatively small streams, completely surrounded by the exhaust steam jet, which is subdivided by the incoming gases adjacent to its point of discharge from the exhaust pipe. The commingling of the exhaust steam and the smoke box gases, and the entrainment of the latter are, by this construction, promoted to a degree which has not been found practicable in devices of the prior art.

In the accompanying drawing: Figure 1 is a vertical longitudinal central section through the smoke box of a locomotive boiler, illustrating an application of my invention; Fig. 2, a plan or top view, on

a an enlarged scale, of the exhaust pipe,

showing; the interstitialu "spaces as -ot .irregular shapeyFig. .3, a similar .view,

showing the interstitial spaces as :of substantially vrectangularform; Fig. 4, a partial vertical sectionthrough' thecexhaust pipe; and, Fig.5, a partial side vie\v,partly in section, ofthesame. v

.In the .practiceof my invention, referring desc-riptively to" the specific embodiment thereof which-is herein. exemplified, the body of the exhaust; pipe, -1, is slightly tapered outwardly from its bottom to its top, and is provided with a'bottom flange, 1", which is adapted to be secured to the cylindersaddles in the usual position, that is to say,'.with the exhaust pipe located, in

the smoke box,'2-, in line axially with the A pluralityof inclined open bottomed gas ducts, ,4, extends through the wall of the exhaust .pipe,. 1, said ducts beingdisposed symmetrically around the axis of the exhaust pipe, and being alternately of greater and? lesser length, 'as 'indicated most clearly in Fig. 1. As shown in Figs. 2, 3an d 4, the

gas ducts 4 ta er' upwardly and extend through the we lof the exhaust pipe 1 to points where they almost contact each other.

In the form of Fig. 2, the top ends'of said duets are left circular in cross-section, so that the steam spaces between them'are of irregular shape, while in the form of Fi 3, the top ends are made pointed towar s the axis of the pipe 1, so that the spaces between them are of rectangular shape. For the purpose of providing additional avenues of gas supply to the exhaust pipe, gas ducts, 4", of shorter length, may be located above the longer gas ducts, as shown in Fig. 4.

In order to promote and accelerate the flow of the gases through the as ducts, 4, they may,-if desired, be provi ed with the accelerator tubes, 4, on. their inner sides, as shown in Fig. 4, through which tubes, portions of the jet of exhaust steam are admitted into the gas ducts, so as to promote the upward traverse of the gases through them.

The application of an exhaust pipe of the construction substantially as above dein a plurality of jets, surrounded by exhaust steam, reduces the tendency to form eddies in the body of gas, which arewell recognized as being detrimental to its free flow. The sudivision of the steam in the exhaust pipe into a plurality of narrow bands, exposes a greatly augmented surface to the gases, with a corresponding increase in the efiiciency'of the ejection.

I claim as my invention and desire to secure by Letters Patent 1. -In a locomotive exhaust pi e, the combinationv of an open ended tu ular-body, adapted for connection to an exhaust steam passage; and a plurality of gas ducts, extending into said body to points adjacent the axis thereof, so as to leave spaces between their inner ends for the passage of exhaust steam to the discharge opening of the body.

2. "In a locomotive exhaust pipe, the combination of an open ended tubular body, adapted for connection to an exhaust steam passage; and a plurality of gas ducts, ex-- tending through the wall of said body to points adjacent the axis thereof, so that the inner ends of the said ducts are surroundel by spaces for the passage oi exhaust steam to the discharge opening of the body.

3. In a locomotive exhaust pipe, the com bination of an open ended tubular body adapted for connection to an exhaust steam passage; and a plurality of gas ducts, ex-

tending through the wall of the body, and opening into the body ina plane adjacent to A the discharge opening thereof, the open ends of said ducts being surrounded by Spaces for the passage of exhaust steam to the discharge opening of the body.

4. In a locomotive exhaust pipe, the combination of an open ended tubular body,

adapted for connection to an exhaust steam passage; and aplurality of gas ducts, of alternately greater and lesser length, extending throu h the wall of thebody, and opening into te body in a plane adjacent to the discharge opening thereof, said ducts being surrounded by spaces for the passage of ex haust steam to the discharge opening of the body. v

5. In a locomotive exhaust pipe, the combination of an open ended tubular body, adapted for connection to an exhaust steam passage; a plurality of gas ducts, extending throughthe wall of the body and opening therein, said ducts being surrounded by spaces for the passage of exhaust steam to the discharge opening of the body; and accelerator tubes, leading from said interposed spaces into the gas ducts.

6. In a locomotive exhaust pipe, the combination of an open-ended tubular body, adapted for connection to an exhaust steam passage; and a plurality of gas ducts, extending through the wall of said body to points adjacent the axis thereof, the inner ends of said ducts being so shaped as to leave passages of rectangular shape between them for the passage of exhaust steam to the discharge opening of said body.

SAMUEL H. DUN NING.

I lVitnesses:

J. BNOWDEN BELL, GEORGE E. BROWN.

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