US874389A - Steam-generator. - Google Patents

Description

-PATENTED DEC. 24. 1907.

T. R. BUTMAN. STEAM GENERATOR. APPLIIOATION FILED nnq. 10,1906.

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PATENTED DEG. 24. 1907.

T. R. BUTMAN. STEAM GENERATOR.

APPLIOATIOH FILED DEU. ;0,1906.

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'taken in eonjunction with the accomp anying TILOMAS RICED BUTMAN, OF LAKE BLUFF, ILLINOIS.

STEAM-GENERATOR.

Specification of Letters Patent.

Patented Dec. 24, 1907.

Application filed December 10. 1906. Serial No. 34.7.16 1.

To all whom 'it may concern:

Be it known that I, THOMAS REED BUT- MAN, a citizen of the United States, residing at Lako Bluil', in the County of Lake and State of lllinois, have invented certain new and useful lmprovements in Steam-Generators, of which 'the following is a specification.

My invention'relatcs to improvements in steam generators, and has for its primary object to provide a steam generator peculiarly adapted for installation in areas having a small vertical dimension, as in cellars of buildings and. like environments.

A further object of my invention is to provide a steam generator of the general character described, which will be efiicient, durable, easy of installation, maintenance and repair, and embody other qualities of practical advantage.

Other and further objects of my invention will best become apparent to those slrilled in the art from the following description,

drawings, wherein Figure 1 is a pair of boilers constitutng a battery, one boiler being shown in elevation and the other in section. Fig. 2 is a central, longitudinal section through the boiler setting, showing the boiler practically in elevation. Fig. 3 is a sectional detail through the shell, showing in elevation the shell supporting saddle.

Throughout the drawings like numerals of reference refer always to like parts.

In said drawings 5 indicates a saddle whereon is mounted and supported a horizontal boiler shell 6 of suitable length wherethrough take the longitudinal fire tubes 7--7 opening as usual through the heads S and 8', aswill be well understood, said tubes being in general conined to the lower area or segment of the shell. From the 'upper portion of the head 8 projects horizontally a drum or drums, the structure herein specifically shown involving three drums 9, Q and 9 of substantially uniform length, considerably in eXcess of the shell 6, but preferably of different diameters, the drum 9 being preferably larger than the drums 9 and 9 which are preferably of equal size.

I prefer that the arrangementof the drums should be generally pyramidal, as best shown in Fig. 1, that is to say, with the largest drum 9 elevated somewhat above and disposed between the smaller drums Q and 9 and separated therefrom to pernit circulal tion of hot gases between the several drums, there being adjacent the free ends of the drums water tubes or connections, 10 and 10, connecting the drums Q and 9 with the upper larger drum 9, for circulation of water from one drum to another. The front or free ends of the drum are preferably guided and positioned in a plate, or metallic boiler front 11, covering the front wall 12 of the structure, wherethrough are made the usual apertures closable by fire doors 13 and. ash pit doors 14.

1.6 indicates a grate disposed beneath the front end of the drums, there being provided at the rear of the grate the usual bridge wall 17 as a part of the furnace structure.

I prefer that the parts be so proportioned that the bridge wall 17 of the furnace structure is separated from the head 8 of the shell 6, by a distance substantially equal to or slightly greater than the length of the tubes 7, so that the tubes 7 may readily be drawn out into the said space (indicated by numeral 18) for substitution of new tubes and repairs when necessary. I further prefer that' the arrangement of the saddle 5,' relative to the supported structure, be such that it is approXimately beneath the center of gravity of the structure to be supported, so that the weight of the entire metallic structure is largely carried thereby and 'substantially all crushing strain is taken from the wall 12 and boiler front plate 11. Thus the free ends of the drums may move in obedience to expansion and contraction without injury to themselves or the said wall 12 and front 11.

In like manner a head wall 19, traversing the structure and surrounding the shell 6 to cut off the combustion chamber 18, from communication with the eduction flue or uptake, is relieved of practically alll strain by the saddle arrangement. The side walls of the battery setting are indicated at 20, and from said side walls to the adjacent drums 9 and between the various drums 9 of the unit of the battery are arranged bridge arches 21-21 of any suitable Construction. Thus all the surfaces of drums 9 and 9 will be eXposed to the heated area, while only the lower surfaces of the drums 9 will be directly exposed.

At their rear ends the tubes 7 of shell 6 open in'to an eduction, or takeup, fiue 22, into which, preferably, opens from without the structure the cleaning door 23. 24 indicates the blow-ofi pipe communicating with the bottom of the shell 6, and 25 indicates the dry steam pipe, of usual Construction, entering the steam space at the top of the boiler, and above the water line.

In use the generator is kept with its water line at about such a level as will maintain the drum 9 half full, so that each unit of the boiler battery provides a very extended steam generating water surface, and a large steam area from which the steam may be taken in a relatively dry condition through the dry pipe 25.

The heat from the furnace 16 impinges directly upon the forward end portions of the drums 9, 9 and 9 which, being of relatively small diameter may be made of relatively thin material and are not liable to deteriorate rapidly from the effect of expansion and contraction. Manifestly the hot gases of combustion flow rearwardly over the top of the bridge wall around and between the drums Q and 9 and the lower part of drum 9, and through the combustion space 18, to the shell 6, through the fire tubes 7, whereby the gases escape to the uptake 22. Thus the large shell 6, of necessity constituted of relatively thick material, is not exteriorly subjected to a high degree of heat, and is thus preserved from rapid deterioration.

While I have herein described, in some detail, a specific embodiment of my invention, which I believe to have many advantages in its details, it will be apparent that in its broader asfpect my invention is not limited to the speci c construction shown and described, and that numerous modifications might be made in the structure without departure from the spirit and scope of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent, of the United States, is.

1'. In a steam generator, a shell, fire tubes taking longitudnally through a portion of the shell, a longitudnal drum communicat ing with the shell, and a gratestructure beneath the drum spaced from the shell a distance substantially as great as the length of the tubes of the shell.

2. In a steam generator, a shell, fire tubes taking longitudnally through a portion of the shell, a longitudinal drum communicating with the shell, a front support for positioning the free end of the drum without substantially restraining its freedom for lon itudinal movement, and a saddle dispose beneath the shell for substantially supporting the shell and drum.

3. In a steam generator, a shell, fire tubes taking longitudinally through a portion of the shell, a longitudinal drum communicating With the she a front' wall for positionng the free en'd of the drum without substantially retarding its freedom for longitudinal movement, and a saddle disposed beneath the structure substantially below its center of gravity for supporting the shell and drum;

4:. In a steam generator, a series of parallel, relatively thin metal drums, water connections between said drums near one end, a shell of relatively thick metal of greater cross sectional area than the combined cross sectional areas of the drums, wherewith said drums connect to open freely into the upper part thereof, fire tubes extending through the lower portion of the said shell, and a grate beneath the drums.

5. In a steam generator, a shell, fire tubes taking longitudinally through the lower portion of the shell, a plurality of drums projecting from and communicating with said shell, one of said drums being arranged part above and part below the calculated water line, and another wholly below the water line, separated from' the first for heat eirculation therebetween, water circulation connections be-' tween said drums, a grate below the drums, and means for directing the heat from the grate to the fire tubes throu h a path including the water filled parts o' the drums and excluding the part of the drum above the water line.

6. In a steam generator, a shell, fire tubes taking longitudinally through the lower portion of the shell, three drums disposed in pyramidal relation, projecting longitudinally from and communicating with the upper portion of said horizontal shell, said drums being spaced apart to permit of circulation of the heating medium therebetween, 'water circulation connections between the lower drums and the upper drum and a grate beneath the forward portion of the drums.

7. In asteam generator, a horizontally disposed, relatively large shell, fire tubes taking ongitudinally through the lower portion of the shell, three horizontally disposed drums projecting longitudinally from and communicatin with the upper portion of said horizontal s ell, said drums being arranged in pyramidal relation, the u per drum being of greater diameter than the lower drums, water circulation connection between the lower drums and the upper drum, a grate 'beneath the drums, and means for confining the heat of said grate to the lower portion of the upper` drum.

' In testimony whereof I hereunto set my hand in the presence of two witnesses.

THOMAS REED BUTMAN.

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