US1619171A - Boiler - Google Patents

Description

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Patented Mar. 1, 1927.

UNITED STATES" 1,619,171 PATENT OFFICE.

.HE'NRY n. WALLIS AND CHARLES 'r. KINGSTON, or DETROIT, M'ICHIGAN.

BOILER.

' Application filed March 29, 1924. Serial No. 702,827,

Our invention relates to an improvement in boilers of the vertical type, shown in the accompanying drawings and more particularly described in thelfollowing specification and claim.

' One of the objects of the present invention is to construct a boiler in which both the upper and lower tube sheets are dished or are of concavo-convex formation whereby they become self-supporting, eliminating the necessity of braces or of the stays necessary in boilers constructed with flat heads or tube sheets.

line that the gases of combustion in their upward course may impinge directly against the walls of the tubes transferring the heat by convection and not by radiation as would be the case if the tubes were vertically disposed. When a volume of gas enters a vertical tube and starts upon its upwardcourse it decreases in volume as its velocity increases and having traveled upwardly a short distance there is only a small core of gas,so to speak,in the center of each tube, the heat being carried to the wall of .One object infproviding a. dished lower head is that it prevents mud from depositing or remaining upon the head between the tubes,the crowning shape of the head assisting greatly in keepingthe latter clean,

as the mud may be readily washed from the crowning head when the boiler is washed out ;a stream of water may be played directly down from the upper hand-hole to the center of the lower head.

Another feature of the invention consists in attaching to the underside of theupper crown sheet a central pipe or tube-closed at its upper endextending downwardly, with its open end adjacent the lower. crown sheet ;the upper end ofithe tube above the water level bemg'perforated for the passage of steam from the steam space of the boiler down through the pipe to a horizontal pipe connected therewith for conveying of the same.

the steam to the work, the central pipe being again perforated, at and immediately below the water level, to admit water which being away from the hot gases will be directed downwardly and out through the pipe contiguous to the lower crown sheet,

the water circulating adjacent to the latter. Surrounding the tubes and spaced from the shell of the boiler and downwardly from the water level in the boiler to a point adjacent the outer edge of the lower crown sheet is a sleeve, concentrically supported within the shell of the boil-er and open above and below for the circulationof the water downwardly between the sleeve and shell toward the crown sheet. 7

With the foregoingand other objects in view which will appear as the description proceeds the invention further resides in the details of construction hereinafter described and claimed, it being understood 7 that changes may be made in the precise embodiment of the invention herein disclosed without departing-from the spirit of the same.

fication: Figurel is a front elevation of a boiler embodying our invention.

Figure 2 is a vertical cross-sectional view Figure 3 is a taken through the upper crown sheet.

Referring nowto the letters of reference placed upon the drawings: r

A denotes the outer shell of the boiler .provided'withvhand openings A-. and A through which. access may be gained for cleaning. 7

B indicates the smoke box hinged atC, that access may be gained to the interior for cleaning or. repairs. b D designates a fire box and E, the grate ars.

F represents a lower tube sheet of concavo-convex formation riveted to the wall of the fire box.

G denotes the upper tube sheet also of concavo-convex formation riveted to the outer shell of the boiler.

horizontal sectional view H indicates a plurality of tubes bent adjawe prefer that they be flush or substantially flush with the outer surface;

for deliv I designates a central. pipeextending downwardly from a fitting riveted to the upper tube sheets provided with a plurality of apertures J, at and below the water level of the boiler to admit the *ater into the pipe that it may be directed dmvnwardl y and out through its open end adjacent the lower tube sheet. The pipe I,- is also provided with a closure plug K at its upper end and with a plurality otapertures li directly below the upper tube sheet tlirough which steam is illll'llltl'tdltl the central pipe ry through a horizontalpipeMfto an engine or other device--not shown.

N, denotes a sleevesurrounding the tubes H and spaced from the sl'lel'l/o't the boiler. eittendmgfroin a point at ornearthe "ater level of the boiler downwardly toward the lowertiibesheet that thewater may ei'rcnla'te downwardly between the sleeve and outer shell and adjacent the lower tube sht ck-as indicated by the arrows inl ig- Having now designated the several parts by reference letters the construction and operation ofthe boiler will be readily understooc'l.

As previously pointed out the crowningshapo of the upper and lower tulie sheets eliminates the necessity of employing: the usual braces and stays reqi'iired in constructine boilers havingflat heads for the support of the tubes and it also relieresthe tubes of an; strain resulting from their ends be ing flanged to overlap the tube sheets or heads. So also the tubes being" bout adjarent their endsinakes it practical to insert the ends on the radius of'the respective heads. The bent ends of the tubes also provide for the expansion of the tlubes and that the tubes may be inclined slightly 1n Order that the gases in their passage therethrough inay'nnpinge upon the walls oi the tubes transferring the heat by CODVECfilOIl tothe surrounding body of Watera The crowning fbrlnation of the lower head materially posit occur.

in preventing the deposit of mad that would :resultitthe tube sheetwere flat and assists in freeing the head should any de- The central tube and inner sleeve provide meansfor the circulation of water downwardly toward the lower crown sheet, as will be readily understood. The hinged!constructioi'i ot the smoke box and the upper and lower hand-hole plates provide means whereby the boiler may be readilv eleanedor re 'iai red. The arelred coule'c-truetion of theupper crown sheet armorial ly addsto the steam s jiaee of the boiler at a given water level.

Having; thus describedour"invention; we claim! i In a vertical tube boileig upper and lewer tube sheets. a plurality of tubesconnectedto the tube sheets, a central pipe extending through the upper tube sheet and suspended t-lierelrom and terminating irnrtaediath above the same, a. plug to close the upper end of said central pipe and the latter extending downwardly from the uppertube sheefltoa i point adjacent th e lower the sheet and open at its lower end and having a pl-u i a lity o t apertures adjacent the water level, whereby the water in the boilel may circulate downwardly tln'ough said pi pe: and be discharged therefroin adyacent the lower tube sheet. a horizontally di. aoseth pipe disposed below the upper tubesheet and: connected with the said eentral' pipe and extending through the shell oithe boiler l ietwee'n" the tubes torthe passage ot steani. .said central pipe having a plurality of) apertures above said horizontallydisposed pipe below the u per tUbGSllGQiZ open to-the steam spact 0d the boiler, whereby steam mat be :ulnritted in the said central pipe for passagethrough said horizontal pipe. a

In testimony whereof, we sign this specification. i it HENRY WALLI CHAS; T. Kl-NGSTQN.

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