US1767173A - Water tube boiler - Google Patents

Description

June 24, 1930; s, @Q -UUE.; 1,767,173

lwATER TUBE BOILER Filed Mafch 28. i928 .s sheets-sheet 2 kff Jun 24, 1930. vs. P. COULTER 13675117.31'-

l WATER TUBE BOILER Filed March 28, 192s s sheets-sheet 3l Patented June 24, 1930 UNITED STATES lPara veinen l SAMUEL P. COULTER, MUNCIE, INDIANA WATER TUBE BOILER Application led March 28, 192.8. Serial No. 265,370.

The object of the invention is to provide a boiler of the water tube style which is of such a form that it may be constructed in units having high horse-power ratings and practically `wholly of boilersteel so as to avoid the use of brick construction in the insulation thereof; lto provide aboiler of this 15 iining the furnace as well as those for defiecting the exhaust gases in their passage to the smoke-box are of hollow form and constitute water circulating mediums,

Vith this object in View the invention consists in a construction and combination of parts of which an acceptable embodiment is described in `the following specification and illustrated in the accompanying drawings wherein:

Figure 1 is a central vertical longitudinal sectional view of a boiler construction in accordance with the invention.

Figure 2 is a front elevational View.

Figure 3 is a view partly in end elevation and partly in vertical section of the shell of the boiler, and

Figure 4 is a vertical sectional view of a portion of the shell of the boiler.

The shell 10 which houses the water circulating tubes 11 as well as the furnace 12 is of U-shaped form, being constructed of boiler sheet shaped to provide a transversely arcuate drum 14 and lateral pendant water ,y legs 15. The sheets constituting the-shell 49 are united in any acceptable manner but are shown in the illustrated embodiment as riveted, as indicated at 16, the drum, to preserve its shape under pressure, being stayed as indicated at 17 and the water legs stayed e5 as indicated at 17a.

The boiler front, below the drum, is defined by a series of transverse headers 18 arranged in superposed relation and a furnace door ring 19. The headers and door ring are preferably of cast steel and of hollow forni.` They span the water legs 15 at the front and are in communication with the latter by means of nipples 20. The door ring` is formed with doorl openings 21 and 22 giving access to the lire-box. and ash vpit '55 respectively of the furnace-12.

The tubes 11`connect with the headers 18 and open into the latter and they likewise connect Vwith and open 'into the headers 23 disposed at the rear end of the shell but spanning the water legs and being interiorly in communication with the latter by means Lof nipples 2li.V The `headers 23 are identical with the headers 18 and arranged 'in the Y saine manner but at a lower level than the headers 18 to give va downward inclination rearwardly to the tubes 11. Thev headers `being of cross-sectionally vrectangular forni and the tubes beingdisposed at 'right angle to the connected walls lof the headers, the

latter are disposed at a slight angle Vto the Yperpendicular 'and this larrangement disfposes the rear lower edge of'each header below the horizontal plane of the outer upper edge of the next lower header, thus providing for an voverlap of the adjacent headers. This arrangement facilitates the `assembling operation as the headers may be `first placed with front walls vertical when there is enough space between adjacent :headers to provide formountingjof each one 'without interference from the adjacent one.

After mounting,'the swinging of the head-v ers tothe inclined positioiis,'wliich are those that'inust be assumed when the tubes areV 8 5 installed, brings the walls of adjacent headers'into relatively close arrangement.

The back wall 25 vof the furnace 12 is in the form of a hollow steel casting spanning the water legs 15 and acting as acirculating 9G niediuin for the boiler water Vby reason of the Anipple connections 26 with the water legs.

preferably brick. A hollow bafile plate 28 spans the water legs 15 just below the drum 14, this baffle plate beingdisposed in a vertic'al plane intermediate between the vertical planes'o'f the back wall 25`and the rear -end 'im of the shell. It is preferably a hollow steel casting and constitutes a water circulating medium by reason of its nipple connections 29 with the water legs 15. A baiile 30 preferably of brick extends from the lower edge of the baiile plate 28 to the bottom row of the tubes 11. A

The rear end of the shell below the headers 23 and between the water legs 15 is closed with a wall 31 and above the headers is provided with a thimble 32 for connection with the stack to place the smoke-box 33 in connection with the latter. Y

The fire laid on the grate 34 heats directly the adjacent portions of the shell and water circulating parts, the burnt gases arising passing between the tubes 11 forward of the baille 27, down between the tubes back of baiile 27, down under the under edge of the baffle and up between the tubes into the smoke-box 33 and thence to the stack.

A fusible plug 35 is mounted in the crown sheet 36 just above the furnace 12.

To give ready access to the tubes 11 both the headers 18 and 23 are provided with hand openings 37 arranged in axial coincidence with the tubes, each hand hole being inclosed with a removable cover plate not shown.

By reason of the particular form of shell and arrangement of water circulating tubes in the latter a maximum heating surface is presented to the action of the heat given off by the furnace, so that for a unit of given dimensions, a maximum amount of water is evaporated resulting in increased steam output, thereby increasing the steam generating capacity without increasing the physical dimensions. The particular form of door ring and baille plate add to the steam generating properties and the form generally makes for the installation without the use of brickwork except where it may be desired to use it, instead of metal, on top of the back wall and below the baifle plate.

From the foregoing description, taken in connection with the accompanying drawings, it will be noted that lthe headers of eachV set are free of communication and connection with each other, that the hollow front or door ring is free of communication and connection with the headers, that the back wall is located below the tubes, that the baffle is located above the tubes, and that the headers, front wall, back wall and baffle are connected to the water legs solely by the nipples which establish communication between said parts, with the result that any or all of the parts may be easily and quickly removed and replaced.

The invention having been described, what is claimed as new and useful is:

A steam generator, comprising a drum, water legs co-extensive with the drum and disposed at opposite sides thereof, front and rear sets of headers spanning the water legs, the headers of each set being free of communication and connection with each other, nipples establishing communication between the water legs and the ends of the headers and constituting the sole means for connecting the headers to the water legs, one set of headers being disposed at a lower level than the other set and the headers of both sets beingcross-sectionally angular in form and disposedv at a slight angle tothe perpendicular with the rear lower edge of each header below the horizontal plane of the front upper edge of the next lower header, tubes connecting the headers, a hollow cast steel front spanning the water legs below the front headers and having fire and ash door openings and connected to the water legs and free of communication and connection with the headers, a hollow back wall spanning the water legs below the tubes and communicating with the water legs, and a hollow baiile spanning the Water legs above the tubes and communicating with the water legs.

In testimony whereof he aflixes his signature.

SAMUEL COULTER.

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