US142534A - Improvement in steam-generators - Google Patents

Description

"NITED STATES WILLIAM P; TnowBRIDeE, 0E NEW HAvEitooNNEoTIoUT.

IMPROVEMENT IN STEAM-GENERATORS,

Specilication forming part of Letters Patent No. 142,534, dated September 2, 1873; application filed March 26,1873.

To all 'whom t may concern:

tutes a part of this specification, and repre sents a verticalsection.

This invention relates to an improvement in apparatus for generating steam or evaporating purposes by means of a medium passing through a coil or succession of pipes within a boiler or evaporating chamber.

It is a Well-known fact that water or other` medium entering a heated vessel below,pass ing therethrough, will, as it becomes heated, pass Voutat the upper portion, thence to any desired point or vessel, returning through the lower tube to be again reheated, and so continuing, the circulation of' the fluid `causing the heating of that portion outside that immediately in contact with the re. For evaporating purposes a succession of pipes or coils are sometimes arranged in the bottom of an evaporating pan orchamber, these pipes having connections with other coils or chamber inor around the lire-box, so that one end of A thetube will lead into the lower portion and the other end into the upper portion. When heatedthe circulation will be maintained, as before described, heating the pipes in the evaporating chamber or pan to cause the heating or evaporating of the contents; but in such construction, in proportion as the tubes outside or away from the re become` heated, the rapidity of the circulation diminishes-that is, if the Iiuid or medium in the tube outside the fire-box is of the same temperature as that where lthe heat is applied,

there will be no circulation; hence such av chamber in connection with a second coil orn succession of pipes leading from the upper p portion of the irst and returning into .the lower portion of the first, combined with a pump in connection with or between the said heating chamber or coil and the second coil, whereby a forced circulation of the liquid from the first chamber through a circuit embracing the secondlcoil is maintained through both, and not dependent upon the evaporation in the first or condensation in the second, as more fully hereinafter described.

I illustrate my invention as for generating steam within a close boiler.

A is a lire-box of any convenient construction; B, theY outlet for the products of combustion. Within the fire-box a coil, G, ofV tubing is arranged, one end extending ont below, as at a, the other above, as at d. From thepoint a a tube, D, leads to a pump, E, of any/suitable construction for forcing the fluid. From the pump, in the opposite direction, the pipe E', which is practically a continuation of the pipe D, leads into a boiler, F, at or near the bottom. Within the boiler the pipe is coiled, passing out near the top, as at b, thence running into connection with the lire-box coil, as at d. At any convenient point a standpipe,H, is arranged in connection with the said tube extending above the highest point.

Through this stand-pipe H `the tube is filled, but not so as to completely fill the stand-pipe. The stand pipe is then closed, the space within allowing the expansion o emedium within the tube when heated. This pipe may be closed by a regulated pressure, if desirable! The boiler F is preferably made from strong cast metal, so as to be capable of standing a very great pressure, and from this an outlet, L, permits the taking of the steam from the boiler to any desired. point. The boiler is partly lled with water or iiuid from which it is desired to generate steam, say, up to the broken lines. `This completes the'apparatus. The fire made within the fire-box rapidly heats the coil G. The pump E is started and kept in motion, drawing the water from the coil in the boiler and forcing it through the coil in the nre-box back into the boiler, thus maintaining a rapid circulation within the tube, and this, as rapidly heated within the tire-box, u

P coil to a high degree; thence to be taken to pss ng to the boiler quick y causes the boilin g of water therein, gener ating steam there- "i m, which rapidly rises through the upper rt on of the coil; there slperheated by the the point of utilization.

By this construction I am en abled to generate a large amount of very high pressure steam Within a compass very s all when compared to other steamgenerati f apparatus of equal capacity, and such a ste ani-generating apparatus is peculiarly adapt ad for steam-engines for light work, which is now done by foot or hand for want of a competent power oi' little cost.

In such class of apparatus the firing or principal heating may be done by the use of gas or equivalent means, so that when a constant use is not required, the getting up oi Water may be used as the medium to circulate in the pipes, but for very high temperature some other medium which does not boil until a much higher temperature would be preferable.

I claim as my invention- In an apparatus for generating steam or evaporating, consisting of a coil or succession of connected pipes, or a chamber, arranged so that heat may be applied thereto, the said coil or chamber in connection with a second coil or succession of pipes leading from the upper portion of the first and returning into the lower portion of the iirst, a pump, E, in connection With or between the said heatingchamber or coil and the second coil, whereby a forced circulation of the liquid from the first chamber through a circuit embracing the sec ond coil is maintained through both, and not dependent upon the evaporation in. the irst or condensation in the second, substantially as and for thev purpose described.

WILLIAM P. 'IR'Oifi/'BRIDGE` Witnesses A. J'. Tnx'ul'rs, J. C. EARLE.

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