US472777A - yarrow - Google Patents

Description

(No Model.) 3Shets-Sh6et 1..

A. PQYARROW.

WATER TUBE BOILER.

.WITNESS v INVENTOR fgw W am 7 fi I A ATTORNEY (No Model.) 3 Sheets-Sheet 2.

' A. F. YARROW.

WATER TUBE BOILER.

No. 472,777. Patented Apr. 12, 1892;

WITNESSESC v I INVENTUR 620W v i Q ATTORNEY (No m dei. 3 sheets-sh en s.

A. P. RROW.

v WATER BE BOILER. No. 472,777. Patented Apr 12, 1892.

WITNESSES manna! UNITED STATES PATENT OFFICE.

ALFRED F. YARROV, OF LONDON, ENGLAND, ASSIGNOR TO HORACE SEE,

- OF NEW YORK, N. Y.

WATER-TUBE BOILER SPECIFICATION forming part of Letters Patent No. 472.777, dated April 12, 1892.

Application filed August 8, 1891. Seriel No. 402,073. (No model.) Patented in England November 11, 1889, No. 17,958.

To all whom it may concern.-

Be it known that I, ALFRED FERNANDEZ YARROW, of Isle of Dogs Poplar, London, in the county of Middlesex, in the Kingdom of Great Britain, have invented a new and useful Improvement in ater-Tube Boilers, (for which Letters Patent of Great Britain, No. 17,958, were issued to me, dated November 11, 1889,) which invention or improvementis fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to provide a simple and' strong boiler of comparatively light construction, the ends of whose tubes shall be easily accessible for the cleaning, repair, or renewal of the tubes.

The invention will first be described in detail and then particularly set forth in the claims.

In the accompanying drawings, Figure 1 shows a part-end elevation and part crosssection of a boiler embodying my invention, set within the transverse contour or outlines of a boat or vessel. Fig. 2 illustrates in longitudinal section the parts shown in Fig.1.. Fig. 3 is a view similar to that shown in Fig. 1, but having the tubes differently set in the tube-sheets. Fig. at shows in cross-section a modified form of construction in which there are two upper steam and water chambers connected by crossed tubes to two similar lower steam and water chambers. Fig. 5 illustrates in end elevation the modification shown in Fig. 4:.

In said figures the several parts are indicated by reference-letters, like letters indicating like parts.

Referring to Figs. 1, 2, and 3, the letter A indicates an upper cylindrical water and steam chamber formed in halves secured together by flanges A. Two bottom waterchambers B B are connected to the chamber A by the water-tubes O. The chambers B are constructed each of a semi-cylindrical part B, closed by a flat cover B bolted to flanges on the part B and having holes into which are screwed or otherwise fixed the lower ends of the tubes 0, the upper ends of which are screwed or otherwise fixed in holes formed in the chamber A. The furnace D is situated between the bottom chambers B, the flames or gases of combustion being caused to pass transversely between the tubes 0 on their way to the uptake E.

F indicates the casing of the boiler.

Longitudinal or transverse baffle-plates may be provided between the tubes 0, so as to cause the flames and gases of combustion to take a circuitous course on their way to the uptake and chimney, or in lieu thereof the modified arrangement shown in Fig. 3'may be adopted, in which the tubes of the middle and outer rows cross each other at the middle, so as to obstruct the passage of the flames and gases at that part, and thus cause them to take the circuitous course indicated by the arrows, firebrick cheeks D being provided at the sides of the furnace to obstruct the direct passage of the flames between the lower ends of the inner rows of tubes. The tubes'G, of larger diameter than the tubes 0, connect the chambers A and B B at the ends of said chambers outside the casing F for effecting the downward circulation of the water.

In Fig. 4 two upper steam and water chambers A A are shown, constructed similar in form to the lower ones B B, to which said chambers A A are connected by the tubes 0 O in such manner that the two sets of tubes cross each other over the furnace, as shown, so that as the part. where the tubes cross acts as a battle the flames and hot gases are made to effectually penetrate first between the lower ends of the tubes and then between the upper ends of the same on their way to the uptake E. The two sets of tubes 0 C may, however, connect the upper chambers A and lower chambers B without crossing.

From the description above given it will be perceived that I provide two bottom waterchambers at some distance apart with the furmace and flame-space between them, and above these I provide an upper chamber for water and steam, situated at the apex of a triangle having the two lower chambers at the extremities of its base. Each of the lower chambers is a semi-cylinder having a flat cover flange-jointed to it, this cover having holes through it, so as to constitute a tube-plate, and lying at an angle. I make the upper chamber a cylinderin two parts flange-jointed together, and I bore in its lower side two sets of holes for tubes corresponding with thoseof the tubeplates below. Between the upper chamber and each of the lower chambers I fix a number of straight or approximately straight tubes, which lie at an angle. I secure the tubes in the usual way either by screwing or by expanding their ends in the holes in the tubesheets. By unbolting the flanges and removing the bottom parts of the lower chambers I get access to the lower ends of the tubes,and by removing the upper part of the upper chamber I get access to the upper ends of the tubes. It will also be perceived that instead of a single upper chamber receiving both sets of tubes I provide for two upper chambers flangejointed; the one chamber receiving one set of tubes and the other receiving the other set of tubes, as alreadyhereinbefore described. By making the chamber A a true, cylinder, yet at the-same time longitudinally and diametrically divided, so that the two semi-cylinder halves may be separably united by bolts, and combining'this chamber with the semi-cylinders at the sides of the grate-bars, said semi-cylinders-being also separably bolted to flat tubesheets,-there is secured not only the vital characteristic of strength to all parts, but the equally vital feature, in particular for this class of boilers, mostly of limited size, of accessibility to the tubes for cleaning, repair, or replacement: I v e t i v I am'aware-t'hat many years ago it was proposed to connect in some indeterminate way within a furnace steam and water chambers discharging at one open end into an interior Water space between water walls of a shell-boiler or partialshellboiler, and such a construction I do not claim. Such construction is a practically permanent connection and not a separable connection of any of its parts." Moreover, in so great a mass of water as must be contained in said water-space exposedto the full heat of the furnace thetendency of the circulation of the water to therein'ascend and thus defeat the course of circulationdesired is so great that special mechanical means were proposed to produce a descending current in'the water-space. Great weight of water and of metal, greater com plexity and cost, and less durability are also involved in the use ofsaid water-space-shell connstruction. In my invention the separable character of each entire generator-chamber into two parts or sections is one of its essential elements. Both parts in all the generatorchambers are not only secured together by steam-tight joints'at both sides, but in both heads also by bolts through said joints. Not only do no ends of any of my generator-chambers connect with or discharge between shell water-walls in the .furnace, but both ends of each generator are closed by heads outside of the furnace-walls and no shell constructions are anywhere employed.

Having thus fully described my said invention, I clai'n r l.- In a water-tube boiler for the generation of high steam, the combination of the-following named elements: generator chambers, each chamber composed of two sections separably secured togetherlongitudinallyon both sides and both heads by bolts passingthrough steam-tight joints in said sides and heads, water-tubes for ascending circulation within a f nrnace and connecting one section of .eachof said chambers to a sectionof anotherchamher, and downcast pipes outside of the furnace-walls, connecting said generator-chambers, substantially as and for the purposes set forth. v 2. In a water-tube boiler, the combination of a single upper generator cylinder or drum composed of two semi cylindersseparably bolted together longitudinally through steamtight joints in both sides and heads and lower water-chambers composed each of two sections, the one a flat tube-sheet and the other a semi-cylinder, separably bolted togetherlongitudinally through steam-tight joints in both sides and both ends, said upper cylinder and lower chambers being connected by circulating-tubes within the furnace, whereby access is obtained to both ends of said tubes by the removal of the bolts in said joints, substantially as set forth.

A. F. YARROW.

Witnesses:

ANN UNDERwoon, EMILY J. PEASCOD.

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