US339393A - magoon - Google Patents

Description

(No Mudel.)

'EL FAIRBANKS 8v C. H. MAGOON.

FEED WATER HEATER. No. 339,393. Patented Apr. 6, 1886.

@TEAC u n( llamen STliTns lrlnTnnT @Terreno FEED-WATER HEATER.

SPECIFICATION forming part of Letters Patent No. 339,393, dated April Application filed October 26, 1885. Serial No. 160,942. (No model.)

To @ZZ whom it may concern:

Be it known that we, HENRY FAIRBANKs and I@nannies H. MAGOON, of St. J ohnshury, in the county of Caledonia and State of Vermont, have invented a new Improvement in Feed-Tater Heaters; and we do hereby declare the folloning, when taken in connection With accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this specification, and represent, in-

Figure l, a perspective view of the heater, showing the trap as suspended therefrom; Fig. 2, a longitudinal section of the heater, showing side view of the tubes, and showing the trap with its covering-plate removed, and also showing longitudinal section through the check-valve; Fig. 3, an end view of the heater from the inlet end, that head removed; Fie. 4, a top view in partial section, parts brok en awa-y to show the series of tubes.

rlhis invention relates to an improvementin feed-water heaters specially adapted for locomotives, and in which the exhaust-steam Iis employed as the medium for heating the feed- Water, the object being a simple and effective heater adapted to be applied to a locomotive under the boiler; and it consists in the construction as hereinafter described, and more particularly recited in the claims.

I will first describe the general construction of the heater, which, however, is the invention of Henry Fairbanks, one of these applicants, iiled October 26, 1885, Serial No. 180,943.

A represents the case which forms the heater-chamber. lt is provided With a head, B, at one end, and a like head, G, at the opposite end, so that the case forms a close chamber. At one end, say B, two inlets, D E, are made to receive the exhaust steam from the respective exhaust-passages, so that steam is freely admitted into the lieatencham ber. Near the opposite end of the heating-chamber the water-receiving chamber F is arranged horizontally across the chamberand upon its loW- er side. into this chamber F the cold water is forced through a passage, G.

l is an air-chambcr communicating with the to the boiler.

inlet chamber F, and arranged above the chamber F. From the chamber F',and which may be properly called a manifold,7 several tubes, J, here represented as five, lead` These tubes are arranged in a horizontal plane, and extend toward the opposite end. To the end of each of these tubes a return-bend, K, is attached, and to each bend a similar tube, L, is attached by one end and extends toward the opposite end of the chamber parallel with the tubes J. At that opposite end the'tubes each enter a second return-bend, M, and from each of which a tube, N, leads back toward the other end of the chamber, parallel with the tubes L, and at that end the said tubes N each enter a bend, O, from each of which another tube, P, returns to the first end of the cylinder, the several tubes P of the last series entering a second manifold, R, from which an outlet, S, leads to the boiler, so that exhauststeam entering the chamber to impart heat to the tubes water is forced in through the manifold F, distributed to the several tubes J of the first series, thence through the bends K to the second series, L, thence through the bends to the third series, M, thence through the bends O to the last series, l?, thence to the manifold R, where the several currentsjoin, and thence through the tube S All the tubes of the several series being exposed to the exhaust-steam in the chamber, the Water becomes heated to a very high degree in its circuitous passage from one manifold, F, where it enters, to the other manifold, lt, from whence it passes to the boiler. XVere the exhaust-steam to escape directly from the chamber after having circulated therein, it would create a cloud about the engine, not only inconvenient at all times to the engineer, but in cold Weather the escaping steam will condense upon the machinery and interfere materially wit-h its Working. Again, if so escaping freely, it will not develop in the chamber its full heatingpower. To avoid this free escape of the steam and overcome the difficulties before mentioned, We hang a steanrtrap, T, directly beneath the heater, to which the steam must enter, and, there condensed, will escape only as it condenses, and thus will not only avoid the es- IOO caping steam and the difficulties above mentioned, but will also hold the steam in the chamber until it has developed its full heating capacity. The best construction of trap for this purpose is seen in Fig. 2, and while similar to the trap described in Letters Patent of the United States No. 318,271, granted to these applicants as the assignees of said Magoon, dated May 19, 1885, dii't'ers materially from the trapvin that construction in that by its peculiar construction it is adapted tothe employment of a slidevalve for the outletpassage. This trap consists of the casing T, into which the water of condensation may, iiow through a passage, a, at the top, and from the bottom of the trap is an escape or outlet-passage, b. \Vithin the trap is arranged a series of levers. The first, c, has a bearing at one end of the trap, as at d, and, extending longitudinally toward the other end, is connected to the shorter arm of a vertical lever, e. From the longer arm of the said lever c a rod, j", parallel with the rod c, extends toward the fixed end ot' the chamber, where it is attached to the shorter arm of a vertical lever, g, and from thelonger arm of the vertical lever g a third rod, h, eX- tends toward the opposite end of the eylinder, and is hung to the shorter arm of a third vertical lever, t', and from the longer arm of the said lever t' a fourth rod, l, extends toward the outlet-opening, and is there connected to a slide-valve, m, which is adapted to Work overthe outlet-opening. Normally the arrangement ol' the rods is such that the valve stands open to some extentthat is, uncovers the outlet-passage; but as the exhaust-steam is admitted to the heater it Hows directly into the trap, and by its heat expands the several parallel rods,and through their respective levers imparts a sliding movement to the valve sufficient to cover and close the outlet, thus holding the steam within the heater that it may fully exhaust itself upon the watertnbes within. The steam being con densed in the heater, the water of condensation flows into the trap, and, because of its reduced temperature below that of the steam, will cause the rods in the heater to contract, thereby returning or opening the valve to permit the water to escape. \Vhen the water of condensation has so escaped, steam again enters, re-expands the rods, and closes the valve, where it will remain until such time as the water of condensation again accumulates. This arrangement of the slide-valve is much more effective than the lifting valve, and less liable to derangement by obstructions.

The position of the valve is adjusted by means of a set-screw, n, through the end of the chamber against the abutting end of the iirst rod, c, so that by turning the screw in- Ward the valve will be moved toward the closing position, or returned will permit the valve to open to a greater extent.

Because of combining a trap with the heater, it is desirable to prevent the reaction of the exhaust-steam upon'the piston in the cylinder. To this end we introduce a checkvalve,U,in the exhaust inlet-pipes, as seen in Fig. 2, which, while it will freely admit the exhaust-steam, will check against any reaction or return of such steam, however such reaction or return may be induced. At the beginning of each exhaust the tension is considerable, and the heat of the steam is considerably above the 212 which it falls to as soon as it escapes from confinement. This combination of check and trap holds this hightemperature steam between the check-valve of the inlet-pipe and the trap until this heat is taken up by the water in the pipes, instead of allowing it to become latent by the free expansion of the steam. The trap combined with the heater and check valve therefore serve to retain the exhaust-steam in the heater, to eftect the greatest possible result in the heater, and avoid the difficulties which would exist under the tree escape of steam.

Thile we have described the best construction ot' steam-trap known to us for this purpose, we do not wish to be understood as limiting our invention to this particular construction of trap further `than as hereinafter specified.

The arrangement of checkvalve at the inlet-passage is substantially the same as that in Patent No. 298,006. XVe therefore make no broad claim in this application to such a check valve, neither do we make broad claim to a steam-trap composed of a series of expansion-rods in connection with the valve at the outlet from the trap; but

l. A feed-water heater adapted to be arranged beneath a locomotive-boiler, combined with a steam-trap attached to and suspended directly from the heater, substantially as described.

2. A feed-water heater adapted to be arranged beneath a locomotive, said heater consisting ot' a chamber having openings thereto leading from the respective exhaust-passages of the locomotive, combined with series of tribes within said chamber arranged to receive water and conduct it in a circuitous passage through said chamber to the exit, with a steam-trap below said chamber and opening therefrom, substantially as described.

3. The herein-described steam-trap, consisting of the casing T, havingan inlet-open ing, a, and an outlet-opening, b, a slide-valve arranged within the casing, and so as to be moved over said outlet to open or close the same, a series of expansion-rods arranged within the casing, the rst of the series taking a fixed bearing or abutment in the casing, the said first rod connected to the second by a lever, and the second to the third, and so on, the last ofthe series connected'to the said slide-valve, substantially as described, and

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1o to receive Water and conduct it in a cirouitons passage through sai chamber to the exit,

with a steam-trap below said chamber and opening therefrom, and a check-valve in each of the branch pipes to the said chamber, said valves opening toward said chamber, snbstanx5 A tiall y as described.

HENRY FARBANKS. CHARLES H. MAGOON.

Vitnesses:

DENNIS MAY, EDWARD A. NVALKER..

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