US541637A - Steam-boiler - Google Patents

Description

e. SBWBLL. STEAM BOILER.

Patented June 25, 1895. @ee-@@eeeeeeee@ een@ @D C@ C@ me? @D @D THE mms vnzns oo. mofa-urna. wmmcon. u, c.

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k e u e UNTTED STATES PATENT Ciertos.

'GEORGE SEWELL', .OF BROOKLYN, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 541,637, dated .Tune 25, 18 95.

lApplication iiled Iuly 3, 1894. Serial No. 516,424. (No modeLl then point out its novelty in claims.

tube-sheet A or A and an inner tube-sheet` B or B arranged parallel with each other and united at their margins in any suitable man-V ner to form between them water spaces O and O.

D D are numerous water tubes of any con.- venient size arranged at suitable distances apart and connecting the said hollow heads or walls, each of said tubes being fitted and secured water-tightand steam-tight in any suitable manner, as by expanding them into holes provided for them in the several tube-sheets. The said tubes are closed at their ends, the closure being represented as made by plugs a secured tightly into the said tubes.

portions which are included within the water spaces O C. The said hollow heads or walls are represented as approximately vertical having only a slightinclination and the tubes D D are represented as approximately horizontal having only a slight inclination corre- Y sponding with thatV of the inclination of the heads. The holes c nextthe higher ends of the tubes are represented in the upper sides" thereof and the holes c next the lower ends thereof are represented in their lower sides.

The two hollow heads or walls A B and A B containing the water spaces C C', are represented as having at their sides downward extensions E E which form water legs which are closed at the bottom and which rest upon the ground or upon a floor or other suitable The said tubes are provided with holes c c' in thoseY foundation and by which the whole superstructure is supported. Below the watertubes and between the water legs E E is the fire chamber'F represented as furnished with 'a grate G below whichthere is an ashpit -J.

The fire chamber E is represented as provided under the higher ends of the water tubes with a lire door H. The rear end of the furnace may be inclosed with brick-work or in any other suitable manner.

vBetween those parts of the water legs E E below the fire grate G, are arranged waterltubes I, the saidtubes I communicating with the water spaces within the water legs E E', which spaces communicate with the water fspaces C C surrunding the tubes D between their respective tube-sheets A B and A B. The connections 'between' the tubesI and the water spaces in the water legs may be made in any suitable manner whereby they are rendered water-tight. One of the said connections is represented in Fig. 2, as made by a stuffing-box d and a screw-plug e, the said stuffing-box being screw-threaded externally and screwed water-'tight in both of the tubesheets A B or A B. The tube enters the inner end of the said stuffing-box and the part which projects into said Abox is r'surrounded therein by a packing e*, preferably metallic. The'screwplug c is hollow and of an internal caliber to tit over the end of the tube I, but its outer end is inclosed and constructed to receive a wrench by which to screwit up against the packing e* for the purpose of tightening the said packing around the said tube. The said stuffing-box and the screw-plug have corresponding lateral openings e through which the tube communicates with the water-space C or-C. This mode of connecting a tube with two tube-sheets between which there is a water-,space might be employed in any part of the boiler.

The tube-sheets A B are connected togetherv between the tubes D D by means of hollow stay-bolts ffpreferably and'represented as consisting of externally screw-threaded tubes ICO off of the outsides ot the tubes by means of a steam blast introduced through said stay.- bolts. The said stay-bolts aretitted with removable plugs g which remain in place while the boiler is in operation but are removed for the purpose of inserting the steam jet nozzle by which the steam blast is introduced.

The upper parts of the hollow heads or walls A B and ABare without any tubes D. The front head A B is continued considerably higher than the tubes so that the upper part C* of its contained space may constitute steam room from which the steam outlet is at h close to the top thereof. The said outlet h may have the steam pipe directly connected with it or may have connected with it a steam drum with which the steam pipe is connected.

rIhe watertubes D D are all inclosed at the top by a cover or roof K which may be of sheet iron covered with asbestos or other nonconductor of heat. The said cover is represented as furnished with an outlet 7a communicating with a smoke-stack orchimney. The sides ot the boiler between the heads A B and A B may be inclosed with masonry or other material or may consist of holiow walls constituting water spaces.

I have represented the boiler as fed with water through a box L attached to the upper part of the front head A B. The feed-pipe is intended to be connected to this box at i. From this box several tubes j lead directly through the tube-sheets A B of the front head and the water-space O between the said tubesheets and through the innertuhe-sheet B of the rear head A B', the said tubes running through the space above the water-tubes D D for the purpose of heating the feed water by the gaseous products of combustion which proceed from the tire-chamber and circulate among and between the water-tubes D D on their Way to the smoke-stack or chimney. The tubes j have water-tight joints in the tubesheets A B of the front head andin the front tubesheet B of the rear head so that they deliver no water directly into the front waterspace C but only deliver it into the rear water-space C into which they open. From this water-space the water enters the tubes D D water space C to the rear Water space C is y downward from the said Water-space through the legs E, thence through tubes I under the fire grate into the rear water legs E', and thence upward to the water-space C.

What I claim as my invention isl. In a steam-boiler, the combination with two tubesheets having a water space between them anda watertube in communication with said waterspace, of a stuffing-box screwed into both of said tube-sheets and receiving at its inner end the communicating end of said water-tube,packing surrounding said tube within said stuffing-box, a hollow plug having a closed outer end screwed into the outer end of said stuffing-box, the said stuffing-box and plug having an opening to the water-space between the tubessheets, substantially as hercin set forth.

2. In a water tube boiler, the combination of two heads or walls each consisting of two tube-sheets having a water-space between them, steam generating water-tubes inserted tightly into both tube-sheets of each of said heads or walls and forming communication between the water-spaces therein, a fire-chamber between said heads or walls below said watentubes, a feed-water heating tube passing through both tube-sheets of one of said heads or walls and its contained water'space, and passing through the innertube-shcet of the other of said heads or walls and entering its water-space, and a cover over said tirechamber and said steam-generating and water heating tubes, sltlstantially as herein set forth.

GEORGE SE WE LL.

Vitnesses:

FREDK. HAYNES, L. M. EGBERT.

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