US673668A - Twyer for cupola-furnaces. - Google Patents

Description

Patented May 7, |90I.

a. Amun. TWYER FUR CUPOLA FURNACES.

(Appliation led July 30, 1900.)'

(No Model.)

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UNITED. STATES' PATENT OFFICE.

GEORGE A. TRUE, OF DETROIT, MICHIGAN.

TWYER FOR CUPOLA-FURNACES.

SPECIFICATION forming part of Letters Patent No. 673,668, dated May 7, 1901.

Application filed July 30, 1900. Serial No. 25,336. (No 11106.61.)

To all whom t may concern:

Beit known that I, GEORGE A. TRUE, a citi'- zen of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Twyers for Cupola-Furnaces, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention has reference to an improved type of twyer for cupola-furnaces; and it consists, essentially, in the peculiar construction of the twyer and in the novel means employed for adjusting the latter, as will be more fully hereinafter set forth. P

In the construction of cupola-furnaces it is desirable for well-known reasons to provide a blast which will reach the center as well as the outside portion of the cupola. Heretofore center twyers have been employed for this purpose or twyers arranged in the side of the cupola, through which a strong blast is forced of sufficient pressure to reach the cupola-center. The first type of twyer is objectionable for the reason that dificulty is experienced.

in maintaining the twyer, as the latter usually passes up through the bottom of the furnace and is quickly burned out. It is also unsatisfactory to force a volume of air in large units at high pressure through the side of the cupola, as it is liable to cool the slag coming down from above with the molten iron, and` thus obstruct the opening of the twyer. To obviate these objectionable features, I have designed a compound twyercapable of discharging air into the cupola from the side of the latter at dierent pressures, a high-pressure blast of suitable volume being provided for the cupola-center and a low-pressure blast for the maximum portion of heating area, which is toward the exterior of the cupola.

In the drawings illustrating my invention, Figure l is a horizontal section th rough a cupola-furnace and through a series .of my improved twyers arranged therein. Fig. 2 is a vertical central section through one of the twyers and a portion of the cupola, illustrating the adjustable mechanism for the twyer; and Fig. 3 is a detached perspective Viewl of the twyer.

The reference-letter A represents the usual shell or casing of a cupola, provided with a series of twyer-openings B and an inner lining C of fire-brick.

D designates my improved twyer, a series of which are preferably arranged within the cupola, as illustrated in Fig. l.

In construction each twyer is composed of an upper wall E, a lower wall F, and side walls G, as plainly shown in Fig. 3. The upper wall or top of the twyer is preferably arranged at an angle to the lower wall, and the side Walls G diverge at their inner ends or front. Within the twyer are arranged the spaced partitions H and I, respectively, the front or inner ends of said partitions converging and the outer or rear ends diverging, as plainly indicated in Figs. l and 3. These partitions, arranged centrally within the twyer and in the relation to each other as set forth, dividev the interior of the twyer into a multiple of airpassages, the center passage J being adapted to discharge air at a high pressure and the adjoining passages K and L at a lower pressure. Each twyer is arranged Within its respective opening, as shown in the drawings, and is adj ustably secu red to the shell or casing in the manner and for a purpose hereinafter set forth. Extending about the series of twyers is an air-.chamber M, the wall O of which is secured to the shell in any suitable manner, and P is a blast-pipe which communicates with the chamber. It will be thus seen from the description of my twyer that an air-blast entering the twyer from the airchamber will be divided, a portion of theblast being discharged through the center passage, which is in the form of a nozzle, to the center of the cupola, while the remainder ofthe blast passes into the interior of the cupola atalower pressure. Thus I have provided means where-v by the twyer will be prevented from being burned out and at the same time by dividing the blast in the manner set forth prevent the cooling of the slag.

For different kinds of Work and to permit of the use of different kinds of fuel it is desirable to arrange the twyers in such manner that they may be either raised or lowered, as may be found necessary. I have therefore provided a simple adjusting mechanism for the twyers, as will be now described.

Upon the back of each twyer is cast two flanges Q and4 R, extending, respectively,

above and below the twyer, as shown in Fig. 3. Each ange is provided with two vertical slots, such as S, through which securing-bolts T are adapted to extend. The twyer-opening in the shell or casing, as shown, is considerably larger than the twyer, so as to permit ot' the yertical adjustment of the latter therein, and the anges described are adapted to cover such portions of the twyer-opening as extend beyond the twyer. To adjust the latter the bolts T, which secure the flanges to the shell, as shown, are loosened and the proper adjustment effected, after which the bolts are secured andthe twyer is in readiness for use.

From the above description of my invention it will be obvious that many modifications may be made in the construction of the twyer without in any manner departing from my invention as claimed, which consists, essentially, in a compound twyer having means for discharging air into the interior of the cupola at different pressures. Therefore, while I have shown what I consider the most practical form of twyer, I do not desireV to be limited to the exact construct-ion thereof.

What I claim as my invention isl. A tWyer-iron having two discharge-passages extending therethrough, the discharge ends of said passages being respectively contracted and expanded,for the purpose set forth.

. ,2. vA twyer-iron cast in one piece with two adjacentdischarge-passages extending therethrough, one of said passages narrowing from the inlet to its discharge end and the adjoining passage tapering uniformly in the opposite direction.

3. A twyer-iron having arranged within and cast integral therewith two partitions converging at their inner ends, forming a central high-pressure passage and two adjoining passages having expanded discharge ends adapted to discharge air at a lower pressure, substantially as and for the purpose set forth.

,4. In acupola-furnace, the combination of a shell or casing having a single series of twyeropenings therein extending circu mi'erentially about the casing in substantially the same horizontal plane, and a plurality of twyerirons extending within the openings, each twyer having two discharge-passages therethrough, the discharge ends thereof being respectively contracted and expanded.

5. A twyer-iron for cupola-furnaces, having two discharge-passages extending therethrough, the discharge ends of said passages being respectively contracted and expanded,

and slotted flanges at the rear and projecting from the opposite sides of the twyer iron, substantially as described.

In testimony whereof l affix my signature in presence of two witnesses.

GEORGE A. TRUE.

Witnesses: 4

M. B. ODOGHERTY, H. G. SMiTH.

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