USRE2724E - Improvement in cupola and otheb melting-fubnaces - Google Patents

Description

C.. TRuEsnALE.

Cupola Furnace.

Ressued Aug. 6,1867.

Fogjl i nistei tstra strut ffire.

CHARLES TRUESDALE AND WILLIAM RESCRL CO., OF CINCINNATI, OHIO, ASSIGNEES 0F CHARLES TRUESDALE.

Letters Patent No. 54,470, dated May 1, 1866; reissue' No.. 2,724, dated August 6, 1867.

IMPROVEMENT IN CUPOLA AND OTHER MELTING-FURNAGES.

TO WHOM IT MAYl CONCERN-z Be it known that CHARLES TRUESDALE, of Cincinnati, Hamilton county, Ohio, invented a new and useful Improvement in Cupolas and other Melting-Furnaces; and `we do hereby declare the following to be a full, clear, und exact description thereof, reference being had to the accompanying drawings, making part of this specificntion clusion of the heat, at which period the common cupola is liable to fall o' in delivery of metal, in consequence of becoming clogged by the bridging of congealed slag, flux, and metal opposite and around the issuesof the tnyeres. In the customary horizontal arrangements of tuyeres, whose nozzles discharge iiush with the general concavity or lining wall of the cupola, and in a common plane, that portion of the metal, slag, &c., which descends near said wal1,", oncoming in contact with the comparatively cold air from the tuyere, becomes con- `gealcd, and, forming an impenetrable barrier to the blast, deects the same violently against the lining of the cnpolanear the issue'of each tuyere, causing the-re-bricl or other lining material to burn out rapidly at those parts. Moreover, when once a bridge" has commenced forming, the accumulated debris in front of each tuyere becomes the nucleus of furtheil accretions, until nearly the entire area immediatelyabove the tuyeres is obstructed The object of this invention is to secure an active and uninterrupted melting action, especially toward the conb'y'an arch of slag, cinders, Src., which arrests the'melting process, .andwhichfis required to be labo'riousliyf` removed before the cupola can be employed for another melting.

This improvement consists essentially in a' system of tuyeres', whose ventag'es ,are adapted to discharge a blast of greater volume below than above. i

This improvement also consists in arranging one or more series of tuyeres in vertical lines, and with dimin-V ished issues as they approach the top ofthe series.4

This improvementA further consists in projecting the openings or ventages of the tuyere beyond the vinner lining, so as to approach the axis of the cupola, each series beingprotected by a pier or vertical set-off;

Figure I is a vertical section of a cupola embodying` m'y improvement.

Figure'2 is a horizontal section at the linea: iig. I.

The wall A of this cupola is traversed by one or more vertical series of tuyeres, B B B B", and we prefer each tuyere of the series to be somewhat less in area of issue than that immediately below it. I n the most complete'form of this improvement the several nozzles of the lt-uyeres projects. considerable distance into the interior of the furnace, eachv series being protected by a p ier or set-cil', C. The blast action being made to take place in one or more vertical columns instead of in arsingle horizontal stratum, any congelation consequent on a too feeble blast or otherwise must of necessity take-a vertical rather than a horizontal direction, and cannot materially obstruct the draught of the furnace. By making the issue or ventage of each'tuyere above the bottom one somewhat less than that immediately belowit,.we secure a gradual softening and reduction of thematerial, the smaller tuyeres rit and ucar the upper part of the series operating to disintegrate the fragments of o re and flux, preparing them for the melting action of the more powerful tuyeres below, and greatly acceleratingl the activity of the 'furnace and the delivery of` the molten metal. The blast issues being made to take place at the central and hottest part of the furnace, the usual chilling action is entirely absent. The vertical piers serve the double purpose of protecting, while moderately heating, the tuyeres, andthey also serve, by removing the issues from the lining, to oblige any deflected currents to traverse a greater distance before they can impinge against it. We have selected for illustration a form which has been successfully tested by us in the foundry, butdo not desire tolrestrict the improvement to the precise arrangement above described, so lo'ng as the same results are. obtained by means substantially equivalent;y for example, although a regular gradation 'in the size of eachA consecutive tuyerein the series is believed preferable, yet the gradation may be more or less irregular or partial,

' und yet answer a good purpose, though in a lesser degree. Again, the tuyeres of euch series may be increased in number and correspondingly diminished in individual area, or they may even'be replaced by u vertical slot, which narrows towards its upper end. There may be a greater or less number of series of tuyeres than in the -present illustration, as the size of the cupola, the natureof the work, material, tc., or otbercircnmstnnces, may make desirable, while the mouths of the tuyeres and the faces of theprotecting piersfmay incline outward or inward from a. vertical direction. An inferior modification of this improvement may consist of a vertical series of graduated tuyores, terminating flush, orneatrly flush, with the lining, and without a protecting pier.

We claim herein as new- T1. The combination with a cupola. or blast-furnace of a. system of tnycres, having openings so :t1-'ranged as t0 discharge a blast of greater volume below than' above, as set forth.

2. The provision in a. cupola or melting-furnace of one or more vertical series of tuyercs, with graduated or decreasing venta-ge towards the upper portion ofthe series, substantially as set forth.

3. The arrangement ot' one or more vertical series of tuyeres,v` which project beyond the common or general lining wall, and are protected by vertical piers, substantially as setfort-h. Y I

In testimony of' which invention we hereunto set our hands.` v

CHARLES TRUESDALE,

WM. RESOR, JACOB RESOR, l WM. RESOR, Jn., Witnesses: v J. B. RESOR.

Guo. H. KNIGHT, JAMES H. LAYMAN.

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