US172836A - Improvement in cupola-furnaces - Google Patents

Description

E. VOISIN. y

- CUPDLA-FURNACE. No.172,8 36. Patentgdfr'eb. 1, m76."

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- Wmmxw UNITED EUGENE voIsI-N,'or- Bouiens; F

ANGE, AssIeNoR- To j PIERRE' ,AiMAB'Ln' 4'WOTQR LE LUBEZ, OFLO'NDON, ENGLAND y l To all 'whom it muy concern:

Be it ,known lthat I, EUG'NE ."Vois'nv,

` Bourges, in theltepublicof ;I rance, civil cn- .gineer7 have vinvented certain Improvements in Cupola-Furnaces, of which' the following is a specification:

The object of these at the throat'or top thereof, and by which im-` provc'nnen ts I ecoillomi'ze fuel, greatly increase the melting-power ofl the furnace, and keep the throat'of they furnace comparatively cool secondly,fto enable a much largerz'quantity of molten metal than hitherto to be collected from a'furnac'e at onetime, thereby effecting Yan economy of time and labor where large castings have to bemade.

To carry out the first part ofmy invention,- lI employ, instead oiffthev` ordinary tuyere or,

" highlycombustible and I place a second set or row of tuyeres, equal in number with the lower`ones, and of such specific dimensions, as compared with such lower ones, as shall serve to supply to the above-mentioned combustible gas (CO) just the quantity of air necessary for effecting its thorough combustion in the interior, instead of letting it burn to waste at the throat of the furnace, as hitherto. This second set of tuyeres is so placed that the saidcombustible gas is consumed While it is in contact with the metal, thus producing a second zone of fusion, thereby considerably reducing the consumption of coke and-accelerating the melting-power of the furnace.

The gases being consumed in the interior of the furnace no ame is produced at the throat of the furnace While it is charged. TheV number of tuyeres varies according to the size of the cupola, and is the same for each row.

. The tworows or sets of tuyeres are always Worked together, the air being supplied therev improvementsis, first,- to effect the combustion in the interior ofthe furnace itself of theJ gases, Which'in ,thelordiunary construction ofa cupola-furnace are burntl formed on the outside or Within lthe ironcasing ofthe furnace, .andl communicating with the` fan or blast enginel.

The second part of this invention'consistsin the application to or placing at the back-of. ,cupola-'furnaces of a chamber yor receiver on -a level,vand always in communication, With the Crucible. or lhearth. of vthe furnace, in .such a wvay as to cause the moltenmetal tol retain-itsl heat While it is being collected, thereby ena-.L .bling a larger quantity ofl metal than hitherto l. to be run ott' at one time, and so a1low.of'v large castings being made froma comparatively small furnace.

Having thusl descrihe'dthe nature -otfmy-v 'said invention, I Will now Yproceed I to more particularly'describ'e the same, and the means14 for carrying it into effect,- by referenceto sthe accompanyingdrawing,in v\vhich-.

Figure l is-a front elevationof a cupola-furi nace with the first, part of my improvements:

applied thereto; Fig, 2, a, vertical section of same. Fig. A3 is a horizontal section onjline a, lb of Fig. l; and.Fig.. 4,a horizontalsectionon-- linec dLFig, ,1; Fig.v 5,.ver tical section, and Fig. 6, a horizontal section of a cupola-furnace, showing the distributing-chamber placedinside the iron casing; Fig. 7, vertical section figures represent also be placed Within the iron casing, as hereinbefore described, and as shown inFig. 5. B is a pipe for conveying the blast into the chamber A; T T, the first row of tuyeres for burning the coke producing the gas CO2, and

forming the rst zone of fusion; t t, second row of tuyeres of a smaller size than the irst row, and serving to consume the gas-oxide of carbon-immediately after its production,

thus creating the second zone of fusion. I

place the two rows of tuyeres at a distance from each other'of from one foot eight inches 1 specificati@ farming part of Laers Patent No; 1 72,836, uatei February i, 1576; ,application mee4 m November-13,1574.

for drawing oi' the moltenmetal `from the crucible; G, cast-iron lining to protect the brick-work at the throat of the furnacefrom the effects of theconcussion of the pieces of metal thrown into the furnace.

In Figs. 7 and 8,'B lis the chamber or receiver placed at the back of the cupola, and

`constantly communicating with the crucible orhearth C by means ofthe opening O in the lower part of the sole-plate, thus allowing the moltenmet-al to run from the crucible into the receiver while still remaining in communication with the metal in the crucible. Y

. When the receiver contains a sufficient quantity of metal for the required casting, the furnace is tapped and the liquid metal passes from the receiver through the opening 0, and throughthe hot furnace -out by the door P, having retained nearly the whole of its heat by being constantly heated by the incoming hot metal from the crucible.

When the receiver is not required the opening O is stopped up, and the cupola may then1 be used as if it had no receiver. v

-The improvements hereinbet'ore described are applicable to ordinary cupolas. v

Having now described my said invention, and the best -means I am acquainted with for carryingthe same into effect, VI would have it understood that I lay nb claim, broadly, to the Vmere employment ot' two or more rows of tuyeres, irrespective of their character and the effects produced by them; nor, broadly, to an annular chamber communicating with two Vor more rows of tuyeres; nor to a receiver, per se; but only, as hereinbefore described, as to the manner in which it is to bemused and the duty which it performs, such disclaimed devices having been before employed in connection with cupola-furnaces-but for other purposes-in a diii'ereut manner and with different results from those herein claimed; but What I do claim isi 1; In a cupola-furnace, the described combination and specific arrangement of tuyeres in two rows of equal number, the sectional area of each of those;` ot' the upper row being exactly one-half that of eac'h ot' those of the lower row, and serving to supply to the gases the requisite quantity of atmospheric air for effecting their thorough combustion within the furnace, as and for the purpose set forth. 2. In a cupola-furnace, a second (as distinguished from a third, fourth, or other) set or row of tuyeres, havingythe same number of tuyeres as has the first set or row, and having tuyeres severally of one-half the area of the several tuyeres of the first row, and introducing streams ,of air in contact 4with the metal, and serving to create a second zone of fusion by consuming and thoroughly burning in the interior of' the furnace the gases which have hitherto been consumed at the throat,`

as hereinbef'ore described. y

3. The combination of the receiver R at-the back of the cupola-furnace with the crucible or hearth, whereby the'metal in the receiver is in constant communication with that in the crucible, and free, when the furnace is tapped, to pass back through the intensely-heated hearth of the furnace, as and for the purpose hereinbefore described.1

q E. VOISIN. y Witnesses H. VoURIoT, F. BAUY.

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