US1205568A - Twyer. - Google Patents

Description

W. D. ROSS, JIII TWYER.

APPLICATION FILED MAY 6, 1916.

1,205,568. Patented Nov. 21, 1916.

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W. D. ROSS, JR. TWYER.

APPLICATION FILED MAY 6. 19I6.

1,205,568. Patented Nov. 21, 1916 2 SHEETS-SHEET 2.

UNITED STATES PATENT onrion.

WALTER D. ROSS, JR., OF ANNISTON, ALABAMA.

'rwY En.

To all whom it may concern Be it known that I, IVAL'rnn D. Ross, J r., a citizen of the United States, residing at Anniston, in the county of Calhoun and State of Alabama, have invented certain new and useful Improvements in Twyers, of which the following is a specification.

This invention relates to twyers and has for its object the provision of twyers of simple construction by which the air blast will be directed positively to the center of the furnace.

Another object of the invention is to so construct the twyer that a burnt out part' may be readily removed without necessitating a reconstruction of the entire furnace, and a still further object of the invention is to so construct the lower twyer that the charge will be directed away fromthe mouth of the twyer and a heavy lining may be employed. V

The invention also seeks to provide a lower twyer so constructed that the air blast will be furnished a wide'passage and at the same time the streams of air will be caused to. converge toward the center of the furnace.

In the accompanying drawings: Figure 1 is a vertical section of the lower portion of a cupola furnace showing my improved twyer in position thereon; Fig. 2 is a horizontal section of aportion of the furnace taken just above the lower twyer; Fig. 3 is a detail view showing the several parts of the lower twyer in perspective and disassembled but approximately in their proper relative positions; Fig. 4 is a detail perspective view of the upper twyer.

The cupola furnace 1 may be of any well known or preferred construction and will be equipped with the usual annular inclosing air box 2 connected by a conduit 3 with a source of air under pressure.

In carrying out my invention, I secure in the wall of the furnace, at the outer surface thereof, a ring or circular shell 4. At intervals around the shell are base plates 5 which are preferably circular and are provided with openings 6 through which cap screws or other fastening devices may be inserted into the shell, as will be readily understood. On its inner side, eachoof'these base" plates is constructed with an annular enlargement or rib 7 around its central bore 8 and at the junction of said rib with the wall of the bore is asmall beveled portion 9. The nozzle or Specification of Letters Iatent.

Application filed May 6, 1916. Serial No. 95,948.

PatentedNov. 21, 1916.

and they will be spaced equidistantly around I the furnace so that an equal distribution of the air blast will be effectedf It will be readily noted that the base plate 5 is not a permanent part of the furnace structure so that it can be readily detached anda burnt out tube or nozzle easily withdrawn when necessary. It will also be noted that a clear passage is provided through the outer surface of the furnace to the inner surface of thesame so that, if the inner end of the twyer should become choked, the obstruction can be very readily removed. Inasmuch as the twyers are inclined downwardly and inwardly, the charge is not apt to enter and collect in the inner end of the twyer so that the liability of the twyer to choke is minimized.

The lower twyers are disposed in a horizontal radial plane of the furnace and are also-provided in sufficient number to permit the entrance of an. air blast through the entire circumference of the furnace. The lower twyers will preferably be provided in six sections, each of which will be composed of a number of separate elements, and ordlnarily six sections or individual twyers will be sufiicient to fill a horizontal radial plane of the furnace. In constructing each lower twyer, I employ alower twyer plate or base plate 12 which will be of arcuate form viewed in plan, but flat when viewed from the side or end and at the ends of this base plate or lower twyer plate, I form upstanding lugs or posts 13 which are of greater extent longitudinally of the plate at their outer ends than at their inner ends, the inner vertical wall 14 of each lug or post being curved so that an air passage will be provided widerat its inner end than at its outer end. Resting upon the lugs or posts 13 and bridging the space between the same is an upper twyer plate 15 which is provided in its lower side with a longitudinal recess 16 having its ends curved, as shown at 17, to correspond to the curved walls 14 of the lugs or posts 13. This recess tapers toward its outer end so that at the outer edge of the plate the surface of the recess will be flush with the surface of the plate. Upon the lower twyer plate 12, at the center of the same, is a division block 18 which extends up to the upper plate 15 and has its outer surface convex, as shown at 19, so that the entering stream will be divided, as indicated by the arrows in Fig. 2. The convex wall of the division block 18 is opposed to the concave walls 14 so that, as the air passes through the twyer, it will not only be divided but the branches of the stream will be given a whirling action so that they will tend to converge toward the center of the furnace, as will be readily understood on reference to the arrows in Fig. 2. The sections or twyers may be arranged with the endsof adjacent plates 12 abutting, but I prefer to employ the wedge-shaped spacing blocks 20 between adjacent twyers. The lower twyer plate 12 is placed directly upon a portion of the wall of the furnace, but I interpose between the upper plate 15 and the furnace wall, segmental filling blocks 21 which conform to the curvature of the Wall and serve as supports for the upper portion of the wall above the twyer. These filling blocks are of such size that two of the blocks will cover the rear half of the upper twyer plate 15 and will extend from the medial vertical plane of one spacing block 20 to the similar plane of the spacing block at the opposite end of the twyer. Upon the inner half of the twyer 15, I place the segmental filling and supporting blocks 22 which are of such form and size as to project beyond the inner end of the twyer and thereby furnish a support for the upper wall which may be thicker than the wall below the twyers so that it will overhang the twyer and thereby direct the charge toward the center of the furnace and away from the twyer. The overhanging portion of the filling blocks 22 are beveled upon their under sides, as shown at 23, so that spreading of the air blast will be facilitated. Between the filling blocks 22 and directly over the spacers 20, are spacers 24, similar in form to the blocks 22. The overhanging portions of the blocks 22 and 24 enable the builder of the furnace to employ a heavy lining just above the twyer so that the life of the furnace will be prolonged.

Inasmuch as the furnace wall, immediately above the lower twyer is thicker than the wall below the twyer, the charge will be clirected away from the inner openings in the twyers and, consequently, will not be apt to collect in and choke the same. Should choking of the twyer occur through the flow of the metal, the obstruction can be easily re moved by the use of a pinch bar or similar instrument. It will be readily noted that each twyer or twyer section has a single entrance opening for the air at its outer side and has two discharge openings at its inner side. The air will thus be divided into two streams as it flows through the twyer and these streams will be caused to converge toward the center of the furnace without losing any of their velocity. The several sections of the twyer are not secured together but are held together by the emplacement of the same within the furnace wall and should any one part be worn out, it may be readily removed and a new part substituted therefor without requiring a dismantling of the entire furnace or the provision of an entire new twyer or new set of twyers. The downward and inward inclination of the upper twyer causes the air to escape therefrom in a downwarddirection so that any tendency of the same to rise through-the furnace will be resisted and the force of these air currents will aid in directing the descending charge away from the lower twyer. Moreover, this inclination of the upper twyers will aid in directing the air blast to the point where it will most effectually accomplish the desired ends.

My twyers are exceedingly simple in their construction and may be readily applied to.

any cupola furnace. The blocks 22 and 24, which are exposed to the greatest heat, are very easily replaced when burnt off. The spacing block 24, being small, can be easily removed and the block 22 will then come out.

Having thus described the invention, what is claimed as new is:

1. A twyer consisting of upper and lower arcuate plates, the lower plate .having posts at its ends to support the upper plate, said posts having concave inner end surfaces, and a division block fitted between the said upper and lower plates between and spaced from the said posts and having its outer wall convex and opposed to the concave walls of said posts.

2. A twyer consisting of a base plate, posts at the ends of said baseplate, an upper plate resting upon said posts and bridging the space between them and having a shallow recess in its lower side extending from post to post, and a division block between the base plate and the upper plate intermediate the said posts.

3. The combination of a plurality of arcnace, of a twyer consisting of upper and lower members constructed to provide a passage therebetween and set into the wall of the furnace, filler blocks set into the wall of the furnace and resting upon the said upper plates, and other filler blocks set into the wall of the furnace and resting upon the upper twyer plates at the inner edges thereof and bearing against the inner surfaces of the first-mentioned filler blocks, the second-mentioned filler blocks having their inner edges overhanging the twyers.

5. The combination with a cupola fun nace, of twvers consisting of upper and lower plates constructed to provide diverg- Gopies of this patent may be obtained for five cents each, by addressing the ing air passages between them, filler blocks resting upon the upper twyer plates at the outer edges of the same and other filler blocks resting upon the upper twyer plates and against the inner walls of the first-mentioned filler blocks, the second-mentioned filler blocks overhanging the twyers and be ing beveled on their under sides at their inner ends, the several filler blocks and the twyer plates being set into the wall of the furnace.

In testimony whereof I afiix my signature.

WALTER D. ROSS, JR. a 8.

Commissioner of Patents,

Washington, D. C.

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