US1500182A - Steam boiler - Google Patents

Description

G. COOK STEAM BOILER July s, 1924.

Filed Juhu 24 1918 @607:96 6700i?, INVENTORj .d0 O O O O OQ mw I .mw o o .o o n .w A uw .QN M. hl T lll! .lllwlllhlll Wl! IH Il! MIIIM .lllllll u M l. i SQ MV I. H H u M L1 @x Y en. Il H s I mi wh ,Mnl N- l v N mw ha. v Q00 rl., OO oowoooo Q WITNESSES AT'ORNEY July a, 1924.

G. COOK STEAM BOILER Filed June 24 1918 2 Sheets-Sheet 2 sulla'. .r-ra. 4

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ATTOR N EY Patented July 8, 1924.

UNITED STAT-Es GEORGE COOK, or BUFFALO, NEW YORK,

STEAM EOILER.

Application led .Tune 24, 1918. 'Serial No. 241,591.

so constructed and'y reinforced that it may' be made of lighter material -than "customary for a desired degree of pressure vand may provide a greater heating surface than is usually provided` in boilers of the type tO which the invention relates. Y

In accordance with the invention the boiler comprises an' inner andan outer shell spaced apart and strengthened by braces with the braces constituting the support for the in-` ner shell, said boiler having a fire box at one end with water legs enclosing it Vand at or near the otherjend provided with a steam dome through which lthere is passed a corrugated smoke flue.

by water tubes carried at the ends Vbyheads which may be removed from the shell, or any one or more of the water tubes may be Y removed, the outer shell having removable head plates whereby the entire face of either end of the shell carrying the water tubes may be reached. To further brace the struc' ture, the water tubes', especially in short boilers, may be traversed by rods, in turn traversing the heads and secured exterior thereto, or short bolts may connect the end plates of the inner shell and the removable heads of the outer shell.

The invention will be best understood from a consideration ofthe following detailed descriptionk Vtaken in connection with the accompanying drawings Aforming part of 'this specification, with the understanding, however, that the invention is notjcon- @dei the boiler,

reference to steam 'i water.

' fined to any strict conformity with the show-` ing ofthe drawings but may be changed and Y modiiedso long as su'chchanges and modif` iication's mark no material departure from' Figure 2 is an elevation ,Q the re'boxv Figure 3 is across section of the boiler with distant parts omitted. Figure 4 is a section on the line 4 4 o Figure 2j f o -F`igure 5 is a detail sectional viewon :a larger scale than the other figures, showing a form of stay bolt.

Figure 6 is :a view Isirriilar to Figure 5, but showinganother form of stay bolt.

Referring to the drawings, there is shown 'a boiler having two shells 1 and?, respectively, the shell 2 being entirelyenclosed in the shell 1. Grdinarilly the shell l'is circular in cross section, uand the shell 2 has its top or crown portion more or less flattened, the shell 2 being otherwise circular in 'cross section. The two shells are'held in approximately concentric spaced relation by stay bolts 3, 4 respectively, l`certain of the b'olts, indicated at 3a, being hollow and closed at the outer ends by'screw plugs 3b, whereby on the removal of a plug, av pipe may be screwed into the hollow stay bolt 3a and Y I compressed air or 'steam ymay be forced into rlhe inner shell of the boiler is' traversed the shell 2 for cleaning purposes, as will hereinafter appear. At suitable points in the bottom portionv of the shell 1 are manhole plates 6 and clamps 7 which may be constructed in accordance' with the usual practice, these manholesV giving access to the space'between the shells to remove deposits ofmu'd and the like, such space, when the boiler 4is in Operation, being lled with toma-ry andthe tubes 9 may be upset in the holes thus provided. The end plates are secured to therc'orresponding ends ofthe shell 2 by rivets 10 'or inany other appropriate manner.`

Fast .to the ends of the shell" 1 are end plates 11',l each with an opening 12 therethrough 'of sullicient 'size to permit the-en- :tire' shell 2 to Vbe introduced or lremoved through it.- Each opening 12 is normally Vclosed by a head 13 'held to the end plate 11 as to slant from one end toward the other. At the higher end the boiler is mounted upon a support 16 and at the lower end is mounted upon water legs 17 joined together to enclose a fire chamber 18, the water legs communicating with the space between the two boiler shells 1 and 2. The fire chamber is shown as provided with a grate 19 without any attempt to illustrate any particular form of grate. The irefchamber is also provided with a door 20 which may follow the customary practice and so needs no description further than to state that while the door is shown at the front of the lire chamber it may equally as well be placed at one side thereof.

The outer shell of the boiler is substantially cylindrical, while the inner shell is iiattened at the crown and throughout its length so that a greater water space is provided between the crowns of the inner and outer shells. The inner shell is in communication with the fire chamber, while the outer shell is in communication with the steam dome, the shells being tilted upwardly and away from the fire chamber in such a manner that the greater volume of water in the boiler will be close to the fire chamber, thereby providing a greater steam space in the outer shell near the steam dome.

Extending through each head 13 and through certain ones of the water tubes 9 are rods 21, the water tubes being of sufficient internal diameter to permit the passage of the rods and leave ample space about them for the flow of water. Surrounding each rod 21, where passing through a head 13, is a screw bushing 22 screwed into the head 13 and traversed by the rod 21, which latter is there threaded for the reception of a nut 23. The bushing 22 is large at its outer end to form a seat 24 for the nut and the eX- terior of the bushing at its outer end is screw threaded to receive a cap 25. In this manner the rods 21 are readily accessible at any time it is desired to reach them, while the caps 25 form closures which may readily be made non-leakable.

The rods 21, which serve to hold the heads 13 from bulging, may be replaced by bolts 26, as shown in Figure 5, these bolts being carried at the outer ends by bushings 22 provided with caps 25 similarly to the showing of Figure 6. The bolts are made only long enough to traverse the space between the head 8 and plate 13 and seat in a bushing 22, each bolt having a head 27 interior to the plate 8.

Rising from the shell 1 at the end remo from the fire box 18 is a steam dome 28 traversed by a smoke flue 29 which may be made corrugated, thereby increasing its heat-conducting surface and also strengthening the structure so that braces may be omitted. The

ing means for steam within the dome 28. The flue 29 may termina-te above the dome 28 in a collar 30 to which may be applied a smoke pipe, or, in some cases, the products of combustion may escape to the atmosphere directly from the collar 30.

Water is introduced into the boiler for a sufficient depth to cover the shell 2, the water being indicated at 31 in Figure 1. Vhen fuel is burning in the fire box 18 the hot products of combustion rise into the shell 2, heating the walls thereof and also heating the water tubes 9, such products of combustion following the tubes 9 until reaching the smoke iiue 29 and then risingV through the latter to escape to the atmosphere. The hot products of combustion in the re chamber and circulating about the water tubes 9 and against the inner-walls of the shell 2 heat the water between the shells and in the tubes tothe steaming point, the steam collecting in the steam dome 29 from which the steam may be taken for useful purposes as is customary. There is provided a very large heating surface so that steaming may occur rapidly. The tendency of the shells to separate under the steam pressure is resisted by the stay bolts 3 and 4 and braces 15a as well as by the rods 21 or stay bolts 26 as the case may be. The extensive connections between the inner and outer boiler shells and between the heads 13 or between said heads i and the plates 8 permit the boiler to resist internal pressure without the necessity of using metal of the thickness heretofore employed. By makingthe dome 28 of heavierY material no interior bracing is needful. This may be readily done because the dome constitutes but a relatively small part of the boiler and the added weight represents but a small fractional part of the weight of the lboiler as a whole. The corrugated flue 29 is, because of the corrugations, resistant to collapsing pressures, and, moreover, compensates for expansion and contraction besides providing a much greater radiating surface for a given length.'

The ready accessibility of the stay devices represented by the rods 21 'or bolts 26 permits the quick dismantling of those parts of the boiler through which the tubes 9 and other interior parts of the boiler must be reached. n

Since the products of combustion move about the tubes 9, deposits of soot occur thereony and it becomes necessary to remove such deposits from time to time. To do this cap or caps 3b are removed from the hollow stay bolts 3 and a steam or compressed air pipe is connected in placeof a cap 3b, whereby a strong blast may be directed against the soot covered tubes 9 and the accumulations of soot blown therefrom. Deposits of soot also occur on'the inner` face flue 29 will therefore constitute a Superheat-of the shell 2 beneath the 'flue 29. To yremove such accumulations, clean-out passages 32 are provided in traversing relation to the water space between the two shells. These clean-out openings are closed in any suitable manner when not in use.

- The boiler is susceptible of use for large or small installations and may be cheaply built as compared with ordinary boiler installations for the same purpose because the boiler shells may be made of lighter material than heretofore without loss of resistance to internal pressure.

What is claimed is In a steam boiler, in combination, a pair l5 of concentric shells, a water iirebox adjacent one end of said shells, a plurality of water tubes connected to the end walls of the inner shell, said shells and water tubes beingrinclined upwardly from the ireboX end, a steam dome connected to and projecting upwardly from the uppermost end of the outer shell, a ue passing through the steam dome and communicating with the inner shell, and means for maintaining said shells in spaced relation.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature.

GEORGE COOK.

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