US823399A

US823399A - Steam-boiler.

Info

Publication number: US823399A
Application number: US27119005A
Authority: US
Inventors: John Adam Doarnberger
Original assignee: Individual
Current assignee: Individual
Priority date: 1905-07-25
Filing date: 1905-07-25
Publication date: 1906-06-12
Anticipated expiration: 1923-06-12

Description

No. 823,399. PATENTED JUNE 12, 1906. J. A. DOARNBBRGER.

STEAM BOILER.

APPLICATION FILED JULY 25, 1905.

4 SHEETS-SHEET 1.

PATENTED JUNE 12, 1906.

J. A. DOARNBERGER.

STEAM BOILER. APPLICATION FILED JULY 25, 1905.

4 SHEETS-SHEET 2.

( luueufoz than,

4 SHEETS-SHEET 3.

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PATENTED JUNE 12 J. A. DOARNBERGBR. STEAM BOILER.

APPLICATION FILED JULY25, 1905.

PATENTED JUNE 12, 1906.

J. A. DOARNBERGBR.

STEAM BOILER.

APPLIOATIOH rum) JULY 25. 1905.

4 SHEETS-SHEET 4.

m w ill. WM

JOHN ADAM DOARNBERGER, OF ROANOKIE, VIRGINIA.

STEAM-BOILER.

Specifi ation of Letters Patent.

Patented June 12, 1906.

Application filed July 25,1905. Serial No. 271,190-

To all whom, it ma l concern.-

Be it known that I, JOHN ADAM DOARN- BERGER, a citizen ofthe United States, residing at Roanoke, in the county of Roanoke and State of Virginia, have invented certain new and useful Improvements in Steam-Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to certain new and useful in. rovements in steam-boilers, and particulary to the means employed to secure and maintain a water-tight joint between the flues or tubes and the flue-sheets.

My invention has for its object to provide a joint between the fiues or tubes and the flue-sheet which will dispense with the necessity of assing the end of the tube entirely through tlie flue-sheet and beading it upon the outside surface of the same, as has been the usual custom, and in providing means for preventing such vibration of the tubes as might tend to loosen such joints; and with these ends in view my invention consists in the details of construction and arrangement hereinafter more fully set forth.

In order that those skilled in the art to which my invention appertains may know how to make the same and fully ap reciate all of its advanta es, I will proceed to describe the same, re erring by numerals to the accompanying drawings, in which Figure 1 is a vertical section of a locomotive-boiler illustrating the application of my invention. Fig. 2 is a transverse section on the line a; m of Fig. 1. Fig. 3 is an enlarged section of the boiler-sheet, showing more particularly my invention. Fig. 4 is a similar view of a modification. Fig. 5 is a similar view of afurther modification. Fi 6 is an enlarged. detail view of a tube and ue-sheet before the end of the tube is rolled or pressed into the seat in the tube-sheet. I Fig. 7 is an enlarged detail view showing the tube pressed into the seat in the tube-sheet. Figs. 8 and 9 are views similar to Figs-6 and 7 and showing a modification, and Fi s. 10 and 11 are similar viewsjshowing a furt er modification.

Similar reference-numerals indicate like par'tsin the several figures of the drawin s.

' describing my invention such parts lustratq Aggy? 9 be understood as forming 110 n the drawings as are not specifically the fire-box sheet; but it will be un erstood part of my invention and as being of the usual or well-known form.

As already stated, my invention is especially designed to avoid the necessity of proj ecting the ends of the tubes entirely through the flue-sheet and beadin the projecting ends over and against the s eet, as has been most usual in the construction of boilers, and at the same time to provide means for reventing the usual vibrations of thetu es, which has been one of the most prolific causes of leaky joints.

In the accompanying drawings I have shown my invention as especially ap lied to that the same construction is also to the front sheet.

1 is the front tube-sheet, and 2 is the back or fire-box sheet.

3 re resents the ordinary flues extending from t e front to the back sheet. The flue applicable sheet (one or-both) is bored to receive the ends of the fiues in the manner best shown on enlarged scale at Fig. 6, so that for about twothirds of the thickness of the sheet the hole therein is substantially e u'al in diameter with the outside diameter 0 the flue and the remaining portion of such hole is of a diameter greater than the inside diameter of the flue and less than the outside diameter, thus constituting an annular shoulder 4, againstwhich the end of the flue abuts when properly located in the sheet. A circumferential recess or seat 5 is formed by any suitable tool centrally of the hole in the sheet, and this recess or seat is preferably rectangular in crosssection, as shown at Fig. 7, but, if desired, mayQbe of the form shown in Fig. 8. The preferred form, however, secures a much tighter joint, although the form shown at Fig. 8 secures a joint much more effective than the ordinary joint produced by passing the flue entirely through the sheet and turning over or beading theprojecting portion, as has been most common in the construction of boilers.

When the flue has been located within the sheet, as clearly shown at Figs. 6 and 8, it is then expanded ,by the use of anysuitable tool or appliance into close contact with the sheet, as c earl shown in Figs. 7 and 9, the end of the flue orced into the seat or recess 5, and itseXtremitylOcated behind the shoulder 4 and in'close contact therewith, thus not only producing a tight joint but at the same time I 10 protecting the extreme end of the flue from direct contact with the fire-box gases, and the ends of the flues'are also more thoroughl protected by the water circulation. It wifi also be seen that in expandin the ends of the fines as described and forcing a part thereof into the annular recess or seat a sl' ht flare is given to the ends of the fines, which tends to properly lead the draft from the firebox. In the modification shown in Figs. and 11 a copper ring 6 is located in the annular recess 5 and-the end of the flue is rolled into close contact therewith, and the tube is also preferably expanded circumferentially immediately .behind the sheet, as clearly illustrated, whereby a cepper-packed and very tight jointis produce Whi e such joints as I have described are much more effectiveto prevent leaks than the ordinary joint made by expanding the fines and beading the projecting ends, still 4 with the increased length of flues rendered .necessary in the modern locomotives the inauxiliary or reinforcin tube-sheet 7,

- ends of said bolts polygonal project which is bored to receive an sustain the flues 3, which are set and rolled in the said auxiliary sheet, as shown, and which is located about eight inches'(more or less) from the main tube-sheet 2. This auxiliary or reinforcing tube-sheet has no direct connection with any other portion of the boiler except the main tube-sheet and is connected therewith by a series of suitable bolts 8, formed with shoulders 9, to contact with the auxiliary or reinforcin tube-sheet 7 and secured thereto by threa ed nuts 10, the opposite being threaded and formed with a head 11 and secured in the flue-sheet 2 by means of a suitable tool applied to the portion 12. .From this construction it will e seen that the auxiliary or reinforcing flue-sheet 7 is permitted to travel with the expansion and contraction of the main flue-sheet, while at the same time it in no wise affects the free circulation of water .on all sides.

The auxiliary or reinforcing flue-sheet renders the- .flues absolutely stiff and rigid throughout that portion thereof between said auxiliary flue-sheet and the main fluesheet, and hence the joint between the fines and the latter sheet are not affected by the vibration usually occurring in boilers as atas for the purpose ereinbefore set forth.

. ceases present constructed, and consequently with a joint primarily tight any tendency to leakage is avoided, and particularly so when the joint is of the character shown and described.-

W'hile I have shown and prefer to thread the bolts 8 through the main flue-sheet, as shown in Figs. 4 and 5, they may be tapered and headed, as shown in Fig. 3, and, as shown in this figure, a ferrule 13 may be emplo ed to bridge the space between the two uesheets as a substitute for the shoulder 9. (Shown in Figs. 4 and 5.) These bolts are located, preferably, as shown in Fig. 2; but I of course do not wish to be limited to any special location or number of bolts so long as they perform the function described.

In Fig. 5 I have shown an arrangement of bolts and nuts by means of which both of the main flue-sheets and the auxiliary or reinforcing sheet ma be tied together and in which extension-bolts 14, a right and left threaded nut 15, a shoulder-nut 16, and tightening-nut 17 are employed; but I do not wish to be confined to any special detail of construction in so far as the stay-bolts are concerned, the eneric features of my invention residing in the broad idea of the auxiliary or reinforcing fluesheet 8, tied and connected with the main flue-sheet, and or tied in both the main flue-sheet and the auxiliary or reinforcing sheet to prevent the usual vibration at the ends of the flues and the consequent movement of the joints and tendency to leakage.

I have found from practical experience that the presence in the water-space of this auxiliary or reinforcing flue-sheet tends to increase the water circulation around the ends of the fines next to the fire-box or furnace, and hence carries away the heat at that point more rapidly than in the ordinary construction, and that the formation of scale is reduced to the minimum.

It will be understood that while I prefer to employ such joints between the flues and the flue-sheet as I have shown my improved auxiliary flue-sheet and stay-bolts maybe advantageously employed in connection with any well-known joint, as the presence of the auxiliary flue-sheet stayed and tied to the main flue-sheet serves to prevent that vibration of the fines which necessarily tends to I open the joints in the main flue-sheet. v

Having described the constructionand advantages of my improvements, what I claim as new, and desire to secure by Letters Patent, is 1. In a steam-boiler, the combination with a flue-sheet having the ends of the flues joined thereto by a suitable rolled joint; an auxilia flues ro ed therein; and stay-bolts ri idly connected with the main flue-sheet an the auxiliary or reinforc' sheet, substantially the fines rolled IIO 25 reinforcing tube-sheet having the '2. In a steam-boiler, the combination with a flue-sheet having openings of different diameters to produce annular shoulders and formed with an annular recess between said annular shoulders and the opening of largest diameter in the tube-sheet, flues located within the openings of the largest diameter and with the extreme ends or terminals abutting against the annular shoulders of the tubesheet and with their circumferential walls in rear of their terminals or ends rolled into the annular recesses in the tube-sheet and into alinement with the opening of smallest diameter of the tubesheet, substantially as hereinbefore set forth.

3. In a steam-boiler, the combination with a flue-sheet having flue-openings of different diameters and producing annular shoulders and with annular recesses adjacent to said shoulders; tubes located in the tube-sheet and with their extreme ends abutting against the annular shoulders of the tube-sheet; copper packing-rings located in the annular recesses in the tube-sheet, and the body of the tubes in rear of their extreme ends rolled into the annular recess of the tube-sheet and into contact with the copper packing-rings and in alinement with the openings of smallest diameter in the flue-sheet, substantially as and for the purpose set forth.

located in the openings of the flue-sheet and o with their ends abutting the annular shoulders and rolled into the annular recesses; and a reinforcing flue-sheet adjacent to the main fiue-sheet/ and firmly attached thereto by suitable stay-bolts and having the flues rolled into the flue-openings of said reinforcing fluesheet, substantially as and for thepurpose set forth.

5. In a steam-boiler, in combination with front and back flue-sheets and llues having their ends suitably joined to said sheets; an intermediate flue -.sheet disconnected from the boiler with the fines rolled therein. and rigidly tied or fixed in relation with the front and rear tube-sheets by stay-bolts, substantially as hereinbefore set forth.

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

JOHN ADAM DOARNBERGER.

Witnesses:

W. H. LEWIS, JOHN A. PILGHER.