US599609A - Boiler - Google Patents

Description

' (N0 Model.)

.E.HOOIK. STEAM BOILER,

Patented Feb. 22', 1898.

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lowing is a full, clear, and exact description.

. struction and combination of parts, as is herein which similar characters of reference indi- AT FICEQ ENOS HOOK, OF YORK, N.- Y.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 599,609, dated February 22, 1898. Application filed May 14, 1897. Serial No. 636,473. (N model.)

To all whom itqmty concerm.

Be it known that I, ENos HOOK, of New York city, in the county and'State of New York, have invented new and useful Improvements in Steam-Boilers, of which the fol- Thisinvention relates to improvements in steam-boilers of a type having depending water-tubeshung from the crown-sheet of the water-chamber, so as to receive heat from the fire-chamber andthehot-air passage at the rear of said fire-chamber.

The'object of the invention is to provide features of improvement for a steam-boiler of the designated type whereby increased elliciencyis attained by the provision of greater heat-receiving area within the boiler than in boilers of the class above specified as heretofore constructed. 1 v

The invention consistsjin the novel coninafter described, and defined in'the appended claims.

Reference is to be had to the accompanying drawings, forming a part of this specification,

cate corresponding parts in all the figures.

Figure 1 is a sectional side; view of the boiler, showing part of the improvement thereon. Fig. 2 is a sectional plan-view essentially on the line 2 2 in Fig. 3. Fig. 3 is a transverse sectional View substantially on the line 3 3 in Fig. 2. Fig. 4 is an enlarged vertical sectional view of novel details substantially on the line 4 4 in Figs. 2 and 5, and Fig. 5 is an enlarged sectional detail view on theline5 din-Fig. 4. V

The exterior shell of the boiler in this exemplification of the applied improvements is preferably made cylindrical, as shown at in the drawings, and said shell is set in place on masonry A, but it is to be understood that the boiler-shell may, if desired, be otherwise supported and protected at the sides.

An interior shell 11 is held in position within the outer shell 10 by its secured engagement with the boiler-head plates 12 and 13, that are respectively affixed at the front and rear ends of the said shells. The front headplate 12 is apertured to afford access to the interior of the fire-chamber B, which is produced at the front end of the boiler by the Ii ngarea in the boiler.

transverse bridge-wall O and. grate-bars D. The upper surface of the interior shell 11 is flattened to provide a crown-sheet 11, and numerous water -tubes 14. hang from the crown-sheet. The tubes 14 are open at their upper ends and closed at the lower ends, which adapts each tube to receive water from the space between the shells 10 and 11.

Over the grate-bars andinthe fire-chamber B the depending water-tubes 14 are shortened, so asto permit space for fuel on the gratebars, the major portion of the spaced watertubes occupying the hot-air chamber and draft-passage B, that extends from the fiiechamber Bbehind the bridge-wall O.

The usual transversely-disposed crown-bars 15 areaffixed at'suitable intervals on the crown-sheet by bolts which project from said sheet, whereby the crown-sheet is substantially braced against disrupting pressure of steam generated in the boiler.

On the outer shell 10 a dry-steam dome or chamber 16 is preferably placed and is connected with said shell by the neck-pipes 17, asshown in Fig. 1. The draft-passage B communicates at its rear endwith a transverse passage B connected at its bottom with a rearwardly-extending horizontal line B and this flue at its rear end communicates with a vertical draft-chimney, (not shown,) so that the hot products of combustion evolved by burning fuel on the, grate-- bars D pass back between the depending water-tubes 14, and thence to a stack at the rear end of the boiler. The foregoing descriptionof parts briefly indicates the usual construction of boilers having depending water-tubesand is not broadlyclaimed as being a feature ofthe present invention.

In boilers of the depending water-tube type as heretofore constructed a vacant spaceisproduced at each side of the crownsheet if the inner shell 11 is cylindrical. One feature of the present improvement is designed to utilize these spaces and provide longitudinally-extended Water-tubes therein,

which will greatly increase the Water-heat- To this end four header-boxes 18'are provided, two being 10- cated'at each side of the depending watertubes 14 near the front and rear ends of the shell 11. The end walls of each header-box are parallel and have one side wall convexly curved to adapt said side for intimate contact throughout its area with the inner side of the shell 11, and the boxes 18 are firmly secured upon said shell by any suitable means.

The front and rear walls of the headerboxes 18 are provided with circular apertures suitably spaced apart, and in the spaced orifices in each pair of boxes a set of watertubes 19 are secured by their ends in a watertight manner. The apertures in the parallel walls of the header-boxes that are spaced from those wherein the water-tubes are fixed have bonnets 20 secured over them by any suitable means, preferably as shown in Fig. at, where cross-bars and bolts are represented as means for clamping the bonnets over the hand-holes in the outer walls of the headerboxes.

The convex sides of the header-boxes 18 and adjacent portions of the shell 11,engaged therewith, are suitably apertured, as at a in Figs. 1 and 5, which permits water from the water-space in the boiler to enter the headerboxes and circulate through the water-tubes 19. The covered hand-holes that are opposite the water-tubes at each end enable them to be cleaned by the insertion of ascraper or brush.

The annular water-space formed between the inner shell 11 and outer shell 10 of the improved steam-boiler may be measurably widened toward the upper surface of the inner shell 11 by disposing the shell 10 as shown in Fig. 3.

In the annular water-space extending from one side edge of the crown-sheet to the opposite side edge thereof a number of rows of spaced heat-conveying fiues 21 are held by their ends in the front and rear head-plates of the boiler, these spaced fines being arranged to occupy such relative positions in the water-space as will permit a free circulation of water around them, as shown in Figs. 2 and 3, room being afforded for the location of a hand-hole b and bonnet covering the same at each end of the boiler, as shown in Figs. 1 and 3.

The construction and arrangement of the longitudinally-extending water-tubes 19 and longitudinal lines 21 economically utilize the vacant spaces in a boiler of the dependingwater-tube class. The operation, briefly described, is as follows: The products of combustion evolved in the fire-chamber 13 pass rearwardly between the water-tubes 14.- in the passage B and at the rear enter the transverse passage B Thence the heat and gases pass forwardly through the longitudinal flues 21, thence back beneath the shell 10 to a passage leading out to a chimney. (Not shown.)

It will be evident that the products of fuel consumed will be brought intimately into contact with the exterior of the water-tubes 19, as well as the interior of the fines 21, and impart a larger proportion of heat to the water in the boiler for the generation of steam than is effected in boilers not having the improvements.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a steam-boiler, the combination with an outer and an inner shell, end walls for the boiler, and water-tubes depending from the top wall of the inner shell to receive heat from a fire-chamber in the inner shell, of water-tubes secured by their ends within headerboxes, aflixed to the inner shell of the boiler and in open communication with the waterspace of said boiler,substantially as described.

2. In a steam-boiler, the combination with an outer and an inner shell, walls engaging the ends of said shells to produce an annular water-space for the boiler, and water-tubes depending from a fiat crown-sheet on the inner shell so as to be enveloped by heat produced in afire-chamber within the inner shell, of sets of longitudinally-disposed water-tubes at opposite sides of the inner shell, between the depending water-tubes and said inner shell, and a header-box for each end of each set of tubes, which boxes are secured on the inner shell and are in open communication with the annular water-space of the boiler, substantially as described.

3. In a steam-boiler, the combination with an outer and an inner shell, end Walls for the boiler, spacing the inner shell from the outer shell, a crown-sheet on the inner shell, crownbars therefor, and watertubes depending from said crown-sheet between the crownbars, of hollow header-boxes secured on the inner wall of the inner shell, between said shell and the depending water-tubes at each side of the boiler, and horizontal water-tubes having their ends affixed in one of the walls of the header-boxes and spaced apart therein, the opposite walls of said header-boxes being apertured and said apertures being closed,

1 the sides of the boxes attached to the boilershell being in open communication with the Water-space of the boiler, substantially as described.

4. In a steam-boiler, the combination with an outer and an inner shell, end walls for the boiler, spacing the inner shell from the outer shell, and depending water-tubes closed at their lower ends and hung from the upper side of the inner shell, of series of horizontally-disposed water-tubes at each side of the depending tubes, said water-tubes having their ends in open communication with header-boxes communicating with the water-space of the boiler, and series of heat-conducting fiues located in the water-space of the boiler and affixed at their ends in the end walls of the boiler, substantially as described.

ENOS I-IOOK. lVitnesses:

WM. P. PATTON, JNo. M. BITTER.

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