US540945A - Steam-boiler - Google Patents

Description

v(No Model.) 2 Sheets-Sheet 1.

E. M. BOSLEY.

STEAM BOILER.

Patented June 11,1895.

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, E. M. BOSLEY.

STEAMY BOILEB.

No. 540,945. Patented June 11, 1895.

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THE mums Prrms cn.. PHcmLn'Ho.. WASHINGTON. n. c:

. UNITED STATES PATENT OFFICE.

ELIJAH, M. BOSLEY, OF S'I. LOUIS, MISSOURI;

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 540,945, dated June11,l189 5.

Application filed May 5, 1894. Serial No 510,159-` (No model.)

To all whom it may concern:

Be it known that I, ELIJAH M. BosLEY, a citizen ofl the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Steam-Boilers, of which the following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification, wherein- .Figure 1 is a longitudinal section. Fig. 2 is a cross-section on line 2 2 of Fig. 1. Fig. 3 is a cross-section on line 3 3 in Fig. 1. Fig. 4 is a cross-section on line 4 4 of Fig. 1. Fig. 5v

is a cross-section through one of the side draftopenings.

My invention relates to a new and useful improvement in steam boilers, and consists, generally stated, in combining with a tubular boiler, a water-jacket, and in connecting the water-jacket and tubular boiler in such man ner that the water may circulate freely, which v connecting means forms a Water-grate.

Another feature of invention resides in so arranging the tubular boiler relative to the arch of the water-jacket that the two are substantially uninterruptedly connected.

Another feature resides in locating beneath the tubular boiler a depending' water-leg, which acts as a collector for the water-grate and is con nected to the bottom of the tubular boiler, said -water leg or chamber also supporting a bridge-wall, as shown in Fig. 2.

Other minor features of invention reside in the construction, arrangement, and combination of the several parts,all as will hereinafter be more fully described, and afterward pointed'out in the claims.

In .the drawings, A indicates the -masonry upon which the forward part of the boiler is,

supported, said masonry also forming an ashlpit for the water-grate, as shown in Fig. 2.

and the water-grate bars is substantially the same as that described in United States Letters Patent No. 498,378, dated May 30, 1893, granted to me, save in certain particulars, which will be hereinafter mentioned. The line of draft is indicated in the drawings in Fig. 1 by the small spears.

E indicates a tubular boiler, which is provided with the drafttubes c, as is common. The upper side of this boiler is preferably formed with perforations, which open portions communicate with the chamber in the arch of the jacket F, substantially the entire length of the boiler E, at the same time preserving the continuity of the top of boiler E and water jacket F.

' IThe water-jacket F, at its rear end, is prefably circular in form, of greater diameter and eccentrically-disposed to the boiler E, whose rear'end is connected to the chamber of the water jacket F by pipe Gr, as shown in Figs.

1 and 3. The forward end of the water-jacket extends down, preferably in vertical lines, and is supported on the masonry A, as shown in Figs. 1 and 2. This water-jacket chamber nearv its front end and at the junction of the two sets of grate-bars, is` cross-connected by chamber H, which I shall term the distributing chamber. From this chamber H lead the water-grate bars I, which are preferably staggered and arranged at an incline, as shown in Figs. 2 and 1.v These grate-bars lead into a collecting chamber J, which is connected to the bottom of the boiler E, preferably at about its center, by a pipe K. This collecting chamber J is not connected directly to the waterjacket chamber, but its ends are closed, as shown in Fig. 4. l f

L indicates apartition or bridge-wall, which is supported above the collecting chamber, and 'extends upwardly filling the space between the boiler E and the inside wall of the water-jacket F, so as to direct the draft downwardly through the water-.grate bars and under the collecting cham-ber.

The operation of the boiler is asfollows:`

The fire being upon the two grate-bars O and I, the draft willbe in the line as indicated by the small spears in Fig. l. By the presencev IOO 1,while above said dot and dash lines, all the heat which is transmitted to the boiler E is by reflection. The draft is generally opened, so as to pass through the ash-pit D, but it is often desirable that air be admitted to the fire-box, so as to feed the tire on grateV C. In order to do this, I provide the door to grate C with draft-openings and means for regulating the same, and arrange on the inside of the door a bafe plate b, which not only diffuses the air upon its introduction,but, also, heats the same, so as to prevent it chilling the boiler E. It may also be found desirable to arrange draft openings through the jacket F, just above the water` grate bars I. I have illustrated a section in Fig. 5, whereby this may be accomplished, in whichfis the ferrule, f the baifle-plate, and g the draf t-regulator. The object of arranging these draft-openings above and near the fire on the water-grate bars, is to enable the operator to admit oxygen to the incandescent tire on said water grate bars, in order to support combustion. This may be found necessary in some instances, as the green lire is generally upon the grate bars C, and this incandescent lire pushed back on the water grate bars. When the green fire consumes the gases from theash-pit D, the products of combustion, heavily charged with solid carbon, are 4thrown upon the incandescent lire, and if the heat thereof is not great enough to separate the gases, the products of combustion will pass beyond, unconsumed. It may, therefore, be found necessary to arrange the draft openingsj' in the sides of the furnace, so as to support combustionof the incandescent coals, at the same time permitting consumption of the gases generated by the green fire on grate C.

The lines of active draft up through the grate-bar C, down through the grate-bars I, and to the rear of the tubes E will be couiined beneath the dot-and-dash line, as above referred to. Theadvantage of thus directing the active draft tothe lower portion of the boiler E, will be appreciated by those conversant with steam boilers, as such active draft is not directed against that part of the boiler or waterjacket which may be termed the steam-space. Therefore, the portion of the boiler above thevwater-line is never exposed to a direct active heat, but only to reflected heat, which will tend to lengthen the life of the boiler.

It will be noticed that the water-line, which is just above the return draft-fines e, is below the communicating openings between" the boiler E and the water-jacket, thus making said communication one for steam only, which is subjected tothe reflected (not active) heat, thereby forming a connected steam-dome in the boiler E and water-jacket. Boiler E is virtually complete in itself, and might be said to be a boiler within a boiler.

The water circulation is indicated by the arrows in Fig. 1, and may be described as follows: From the water-jacket, it is drawn in froln the distributing chamber H and distributed through the water-grate bars I, whence it is collected by the collecting chamber J and discharged into the bottom part of the boiler E, about midway its length, whence it circulates rearwardly to pipe G and down into the water-jacket, whence it either ascends upwardly, or, if it has lost its heat, will return downwardly and forwardly. to the distributing chamber, whence it will be again circulated. The forward part of the boiler E is subjected to a direct active heat, as generated by the tire on two sets of grate-bars. Therefore, it would be of no special advantage to include that portion of the boiler in the circulation excited by the water-grate bars.

Having thus described my invention, what I claim, and desire to secure by Letters Pat ent, is-

l. In a steam boiler, the combination with a water-jacket which is circular in cross-section at its rear portion, and of an inverted U- shape at its forward portion, the inner wall, at its top, being formed with openings, of a tubular boiler which is eccentrically arranged to the arch of said waterjacket, said tubular boiler being formed with openings at its upper portion which register with the openings in the inner wall of the waterjacket, two sets of grate-bars arranged under the forward end ofthe tubular boiler, in the inverted U -shaped portion of the water-jacket, one set of which is formed hollow for the passage of water, a water-leg for receiving the water from said grate-bars, which water-leg opens into the bottom of the tubular boiler, and a bridge wall which is supported by said-water-leg, whereby the draft from the first set of grate-bars is directed downwardly through the water gratebars, substantially as described.

2. In a steam boiler, the combination with a water-jacket, of a tubular boiler opening into said Water-jacket at the arch thereof, a cross-connecting chamber located at the lower forward portion of the water-jacket, watergrate bars leading from said chamber, a collecting chamber into which said water-grate bars lead, and a connection between the collecting chamber and the tubular boiler, substantially as described.

3. In a steam boiler, the combination with a water-jacket, of a tubular boiler opening thereinto, a distributing chamber located at the lower forward portion of the water-jacket, watergrate bars leading from said distributing chamber, a collecting chamber into which said water-grate bars lead, a connection between the collecting chamber and the tubular boiler, and a connection between the rear end of the tubular boiler, and the rear lower portion of the water-jacket, substantially as described.

4. In a steam boiler, the combination with a water-jacket, of a tubular boiler opening thereinto along its top, a chamber II connecting the water-jacket at its lower forward portion, grate-bars located in front of said cham- ICO IIO

ber, and grate-bars leading from the rear of said chamber-,which conduct water therefrom into a. receiving pipe and thence into the bot-y torn of the tubular boiler, eJ bridge-wall supported by said receiving pipe so es to direct the draft from the first set of grate-bars'down through the water-grate bars and beneath the receiving chamber, and ferrules located in the Water-jacket above the water-grate bars, said ro ferrules being opened or closed by draft regulators whereby combustionprnay be supported on thewater-grate bars, substantially as described. n y

In testimony whereof I hereunto affix my signature, in presence'of two witnesses, this 15 2d day of May, 1894.

' ELIJAH M. BOSLEY.

Witnesses:

F. R. CORNWALL, HUGH K. WAGNER.

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