US412718A - Steam-boiler - Google Patents

Description

@Moden J. BARNHART.

STEAM' BOILVER. Y No. 412,718. Patented Oct. 15, 1889.

' UNITED y 4STATES PATENT EEICE.

' JOHN B ARNHART, OF ALTOONA, PENNSYLVANIA. i

STEAM-BOILER.A

SPECIFICATION forming part of Letters Patent No. 412,718, dated October 1,5, 1889.

Application filed June 8, 1889. Serial No. 313,542. (No model.)

To all whom it may concern.' f

Be it known that I, JOHN BARNHART, a citizen of the United States of America, residing at Altoona, in the county of Blair and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification, reference being had therein to the accompanying drawing. l

In vertical steam-boilers which are constructed with fines extending above the waterline and connected at their upper ends with an upper iiue-sheet an objection exists by reason of the liability of the flues to become loosened at their connection with the said fine-sheet, thus rendering leakage of steam possible and impairing greatly the use of the boiler. This obj ection arises by reason of the fact that the upper endsof said iiues being above the water-line are not subjected to the modifying iniuence of said water, and thus when the fire is started the heatcauses them to expand quickly at their connection with the iue-sheet, and as said sheet is not acted upon to an equal extent with the flues the expansion of the latter causesdamage to the joint, and consequently looseness'- when the parts contract.

The drawing, which' is a vertical central' section, represents a boiler embodying my improvements, the formshown being specially adapted for use with an engine, though it will be understood that the same features areapplicable to all kinds of boilers, such as for house use.

In the drawing, B represents the fire-pot; C, the grate, and a the iiues for the products of combustion, ext-ending through the waterspace W and connected at top and bottom to the line-sheets g andm, respectively.- The. water-space is continued or added to by the water-legs W', extending around the fire-pot and being formed by the shell 1l of said pot and the outer shell h. The water-line is shown at Z, and the iiues a extend above this to their points of attachment with the upper flue-sheet, and it will be apparent that these upper portions of the iiues will receive the full action of the fire whenit is started, which action, being unmodified by the water, will cause said tubes to expand quickly and before the flue-sheet and its supporting-shell are the expansion is likewise equal.

equally heated, with the effect above stated of causing looseness of `joints. To remedy this, I employ a second set of tubes a to heat the shell which supports the upperflue-sheet and through it the sheet itself, so that the expansion of these parts will be approximately equal to the expansion of the iiues. The shell h', which supports the flue-sheet g, is flaring. It extends below the water-line, and then horizontally to provide a supplemental iiue sheet or iiange K, which is connected to the outer shell h. This iiange receives the supplemental fines c, which are thus shorter than the main fines and below the water-line. The heating of these tubes, therefore, is modified by the water throughout. When the fire is started, the heat passes through the tubes a, aswell as through the main tubes a', and the heating of the shell h is simultaneous with and about equal to that of the flues a', and

The steamspace S is heated from the shell as Well as from the tubes, which heat acts upon the flue-sheet to expand the same, and this sheet is also acted upon by the heat from the flues a. A ring 4 is placed upon the flueflange K, which is -preferably inclined inwardly and upwardly to deflect the heat against the shell h', and to provide a heatingchamber oo with a contracted opening at its upper end. The ring is formed with a shoulder, which receives the dome 3, provided with a damper 6, by which the entire draft may be shut off. An inner dome or shell 2. is located upon the upper flue-sheet, and this includes only the main flues a. A damper 5 in this shell serves to shut off the draft from the inner flues c to any desired extent, leaving the draft through the outer tubes entirely free. By this the burning of the fuel is under more perfect control, as the draft may be regulated and rendered even over the grate. The steam its upper part c, which brings the outer nues o. directly over the vertical shell of the firepot, so that the draft is provided from the circumference of the grate all the way across the same, the draft from the outer edge being vertical through the flues a. This also provides a large flue-sheet relative to the diameter of the {ire-pot, and more i'lues may thus be employed. The fire-potis made of a singie piece of metal, the upper part being ared.

What I claim is- 1. In combination, the fire-pot, the upper and lower flue-sheets, the main flues a', eX- tending from the lire-box above the Water-line and connected with the upper sheet g, the shell h for the upper flue-sheet, said shell eX- tending below the Water-line, they flange K, and the series of supplemental tubes a outside the shell h and below the water-line, substantially as described.

JOHN BARNHART.

Witnesses:

JOHN CALVIN BARNHART, WILLIAM ATKEN.

Images