US1038172A - Superheater. - Google Patents

Description

J. M. MGGLELLON.

SUPERHEATBR.

' APPLICATION FILED DEO. 5, 1906. 1,038, 1 '72. Patented sept. 1o, 1912.

. 2 SHBBTS-SHEBT 1.

lQ Q www 9m QW QW QN JAMES M. LICCLELLON, OF EVEBETT, MASSACHUSETTS.

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Speculation o! Letters Intent.

Patented Sept. 10, 1912.

Original application led January 30, 1905, Serial No. 243,858. Divided and this application led December To all whom it may concern:

Be it known that I, JAMES M. McCLEL- Lon, a citizen of the United States, and a resident of Everett, in the county off'Middlesex and State of Massachusetts, have invented an Im rovement in Superheaters, of which the fol owing description, in connection with the accompanying drawing, 1s u. specilication, like letters on the drawing representlng like parts.

This invention relates to superheaters for steam boilers, and in making the invention my aim has been to provide a novel superheater which is effective in operation, and so constructed that it will not become choked or clogged with soot or ashes.

My invention is particularly adapted for use 1n connection with locomotive boilers, but it may also be used with boilers of other types. I have, however, chosen to herein illustrate it in connection with a locomotive boiler, and in the drawings Figure 1 is a vertical section through a. locomotive boiler showing one form of my invention; Fig. 2 is an enlarged vertical section at the end of the boiler showing the manner of connecting the steam dome with the superheat-4 ing tubes; Fig. 3 is a similar view to Fig. 2 showin a slightly modified construction; Fig. l 1s a vertical section through a locomotive boiler of the ordinary type having a crown sheet showing my inventlon applied thereto; Fig. 5 is a horizontal section on the line :1u-m, Fig. 4; Fig. 6 is a sectional view showing a modified form of the invention.

The boiler shell 3 has at one 'end a fire-box or combustion chamber 7 and at the other end a smolrechamber 8 and also has the two Hue sheets l and 5 between which extend the flues 6. These parts are or ma be all as usually found in locomotive boilers and form no part of my present invention.

l have herein illustrated my invention as embodied in two di'erent types of locomotive boilers. In Fig. 1, I have illustrated a l l le ol boiler such as is shown and descrid in my Patent No. 870,455 dated November 6, 1907, and in Fig. 4 I have illus- 1hr-'ated e locomotive boiler of the type now in common use. l

In the boiler shown in Fig. 1, the: steam dome 9 is in the form of a drum which extends longitudinally of the boiler above the re-box, and the water spaees 2 around the fire-box are separate om the. space or be employed for I, 190C. Serial lo. V$10,867.

chamber 11 within the body of the shell 3 between the flue sheets 4 and 5. The latter spacoisflled .completely full of water and provision is made or delivering water from the top of this chamber into the bottom of the water spaces around the lire box. This may conveniently be done by a pipe arranged' in the shell having its upper end near the' top thereof and its lower end opening into fire box, all as shown in said Patent No. 870,455, although as this construction of boiler forms no part of the .present invention, I have not deemed it necessary to illustrate it herein. The steam passes to the steam dome. The combustion chamber of the fire box may have therein a plurality of water tubes'which extend diagonally there across all as shown in said patent, but to avoid confusion in the drawin omitted to show such water tu e herein. For a more complete description of this`con' struction of boiler reference may be had-to my aforesaid Patent No. 870,455.

In the embodiment of the'invention illus- 80 trated in Fig. 1, the chamber 11 has extend-` ing therethrough an enlarged flue 12 which opens at one end into the smoke-chamber 8 and at the other end into the combustionchamber 7 so that hot products of combustion may pass through said flue. Situated within the line 12 are a plurality of superheating tubes 13 which communicate at one end with the steam dome 9 and at the other end. with a pipe or pipes engine cylinders. These superheating tubes 13 extend not only through the flue 12, but also into the combustiomchamber of the firebox, and in the type of boiler shown in Fig. 1, it is possible to extend them through both the line-box and the flue 12 without bendin them at all or without providing them wit elbows or bends. Any suitable means may establishing communication between them and the steam-dome, and in Figs. 2 and 3 I have shown two ways of doing this. In Fig. 2 the steam-dome has communication with a steam-chamber 15 through a suitable connection 16 and port 17, andthe superheating tubes 18 are connectcd to the chamber 15 by means of an ex-l pension-joint. As herein shown, they are connected to the partition 18 of an expension member which is slidably mounted 'in an aperture in one wall of the steam- 110 the Water space at the rear of the Iv have 7.5

14 leading to the 90 ldd chamber 15, and in' order to make a steam tight joint between this ex ansion member and the steam-chamber 15, preferably employ suitable packing 19 which surrounds the expansionl member and which, is heldin place by a clamping member, 20, the position of which may be adjusted to 'clamp the packing rmly inv place "by mean's'of an-ad- Justing screw 21. 22 is a vthrottle'valve which may be employed to control communi-- cation between the steam-dome 9 and super- I',

tubes 13. This construction perheatin mits t e su erheating tubes to expand `or contract in ependently ofthe otherl parts of the boiler. -i f The construction shown in Fig. 3 is substantially like that shown in Fig..2 with this exception that' in Fig. 2 the steam-chamber 15 is formed-with an end 23 throu h the aperture in which the expansion .mem `r-18T is received, while in Fig. 3 saidy expansion member slides back and forth in a ring 24 which is secured within the openin '25 formed in the end of the fire-box, an the, packing 19 is received bet-weenVsa-id ring and the clamping member 20. In this form of the invention also the clamping member 20 is held in' position by .a plurality of clamping vscrews 28 acting near the peripliery thereof instead of a single clamping screw acting near the center thereof. In other respects, however, the twofdevices are alike. 29 designates a throttle-valve which is situated within the smoke-chamber 8. This valve may be operated by a suitable stem 30 which extends through one of the superheating tubes 13 and leads to an accessible point within the cab of the engine.

In the boiler constructed as above described the steam which is generated in the steam-generating spaces 2 passes to the drum 9, all as shown in my co-pending application, and from the drum the steam passes to the chamber 15, and from the latter through the su erheating tubes 13 and thence to the cylin ers. In passing through the superheating tubes the steam becomes su erheated, as vwill beobvious.

ith the construction above described each of the superheating tubes is straight and without an bends or turns, and consequently said tu es form no appreciable obstruction to the passage of the hot gases through the ue 12, and there is no danger of said ue becoming clogged.

In Fig. 4 I have illustrated my invention as applied to the type of boiler now commonly in use in which the tire-box is provided with a crown-sheet 31, and in which the spaces around the fire-box communicate with the space between the flue sheets within thebody yof the shell. In this type of boiler' the space within the shell constitutes a steam and water space, and as the steam is Vgenerated it fills theupper part of said space f'- chamber.

and the dome 32.l In applying m invention to this ty e of boiler I provide tie combustion-cham er with an extension 33 which is 'herein shown as situated above the crownsheet 31. One end of the enlarged iiue 12 communicates with this extension 33, the

other end of said flue 12 communicating with said smoke-chamber, as shown in Fig.

iinunica'te at one end -'with the pipes 14 leadmg to the ,engine cylinder and at the'other end they communicate with the steam-dome 32 through a suitable connection 16. These superheating tubes extend not only through the flue v12 but also through a portion of the combustion-chamber, this portion being the extension 33 in the present embodiment.;

In this form of the invention the steam which accumulates in the steam-dome passes down the connection 16a into the superheating tubes, and in assing through the tubes it beomesl super'eated by the hot gases ywithin said flue as will be obvious.

lIn both embodiments of my invention the withinl some In th forms of the invention: too the. superheating tubes are perfectly. straight and without bends, and as a result they do not form such an obstruction in the Hue 12 as to cause any danger of its being clolgged up with soot or ashes.'

n the form of the invention 4shown in Fig. 4 I' have illustrated a throttle-valve 29 situated within the smoke-chamber which is controlled by a stem 30 which extends through one of the superheating tubes 13, and it' desired I may protect the portion of the st em which extends through the space above the crown-sheet by means of a tube or' pipe 40.

In Fig. 6 I have shown a construction similar to that shown in Fig. 4 with the eX- ception that the connection 16" thrugh which the steam is taken from the steam dome to the superheating tubes is separated from the walls of the extension 33. This construction has the advantage that there is less danger of the wall of the extension 33 burning out at the point where the superheating tubes pass t erethrough than t ere is in the construction shown in Fig. 4.

This application is a division of my copending application Se. No. 243,356, filed January 30, 1905.

Having fully described my invention what I claim as new and desire to secure by Letters Patent is 1. In a boiler, the combination with a boiler shell having a ire box at one end and a smoke chamber at the other, of an enlarged flue extending through said shell and com- .municating both with the smoke chamber `2l. The superheating tubes 13* arev located v vwithin 'the enlarged flue 12 and they cm- `75 90,1; 'superheating' tubes are received partially' @within the enlarged Hue 12and partially ortion of the combustion,

and fire box, superheating tubes extending through said Hue and projecting at one end into the smoke chamber and at the other end into the combustion chamber, means to connect the latter ends of the tubes with the steam-generating compartment of the boiler, and a connection at the other end of the tubes leading to the cylinders of the engine to be operated.

` 2. In a boiler, the combination with a boiler shell having a fire box at one end and a smoke chamber at the other, of superheating tubes extending through said shell and projecting at one end into the combustion chamber-of the re box and at the other end into the smoke chamber, means 'to protect said tubes from contact with the Water in the shell, means to connect the latter end of said tubes with the steam-generating space of the boiler, and a connection at the other end of said tubes for delivering superheated steam therefrom.

3. In a locomotive boiler, the combination with a boiler shell having a smoke chamber at one end and a fire box at the other, of an enlarged flue extending through the shell and communicating at one end with the combustion chamber of the fire box and at the other end with the smoke chamber, superheating tubes extending through said flue and projecting at one end into said combustion chamber and at the other end into the smoke chamber, means to connect the former end with the steam-generating spaces of the boiler, and a connection with the other end of said tubes Within the smoke chamber for delivering superheated steam therefrom.

4. In a boiler, the combination with a boiler shell having a re box at one end and a smoke chamber at the other, of an enlarged flue extending through said shell and communicating both with the smoke chamber and lire box, a superheating tube extending through said flue and projecting at one end into the combustion chamber, means to connect said end of the tube with the steam-generating compartment of the boiler, and a connection at the other end of said tube leading to the cylinder of the engine to be operated.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

J. M. MGCLELLON.

Witnesses:

Louis C. SMITH, MARGARET A. DRUM.

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