US1738277A - Hot-blast cupola - Google Patents

Description

D66. 3, 1929, c, D, BARR 1,738,277

HOT BLAST GUPULA Filed Nov. 15, 1927 INVENTOR C4 465M657, flame Patented Dec. 3, 1929 uNrrEn stares rArENr OFFICE GLARENOEJ). BARR, OF BIRMINGHAM, nnenenanssronon TO AMERICAN CAST IRON PIPE 00., OF BIRMINGHAM, ALABAMA, A CORPORATION OF GEORGIA HOT-BLAST GUPOLA Application filed November 15, 1927. Serial No. 233,388.

This invention is an improvement in hot blast cupolas, and more particularly in cupolas of sectional construction.

In the usual construction of cupola there is provided a shell of metal and a lining of refractory material, usually an integral struc ture, and of a nature such that in case of damage to a part of the wall the entire shell or a large part thereof must be removed to enable repairs.

One of the primary objects of the present invention is the provision of a cupola body of sectional construction, wherein the sections are so arranged and connected that the indi vidual sections may be easily removed and replaced, without dismantling the cupola.

Another object is the provision of means in connection with the sections for enabling a thorough circulation of air through the same, in direct contact with the inner walls of the sections, and wherein the air follows a spiral course to obtain a maximum of travel, thereby to uniformly heat the air before it is delivered to the tuyeres.

Another object is the provision in such a construction of a connection between the severa-l sections, and between the assembly of sections, to firmly connect them together, and to provide for air tight connections between the several sections.

Another object is the provision in such a cupola of a construction enabling the use of special alloy metal in selected parts of the cupola.

In the drawings forming a part hereof Fig. 1 is a vertical section.

Fig. 2 is a section on the line 2-2 of Fig. 1.

In the present embodiment of the invention, the cupola shell is composed of a plurality of similar ring box sections, or annular chambers of suitable material, such as cast 'iron, and air for the tuyeres circulates through the chambers from the top to the bottom.

The sections are individual, each complete in itself, and they are connected one with the other by means of nipples, of taperingform, to provide thus a tight joint between the sections. As many rings or annular chambers may be installed as may be necessary, and in addition to the before mentioned rings or annular chambers, top and bottom rings or chambers are provided of greater external radius and of less vertical depth for a purpose to be described.

In the present embodiment of the invention,the cupola includes the usual base composed. of a lining 1 of refractory material and a shell 2 of metal, resting upon the mantle plate 3. The tuyeres open through the shell 2 and the lining 1 of the base, the inner tuyere l being embedded in the lining, while the outer tuyere 5 is secured to the shell.

With each outer tuyere 5 a down pipe 6 is connected leading from a box ring or annular chamber 7 which forms the lower section of the body of the cupola shell. This section 7 has a relatively large radius, and is relatively small in depth, and provides a collecting chamber and circulating box for the heated air, so that should one of the tuyeres become clogged, the air will continue to work in the remaining tuyeres.

Upon the section 7 a plurality of rings is mounted, each ring 8 having the same internal diameter as the chamber 7, so that the inner walls thereof register with each other and with the inner wall of the chamber to form the interior wall of the cupola shell. In the present instance three of the sections 8 are provided, and above the topmost is arranged a second chamber 9 similar to the chamber 7, and of substantially the same capacity.

The sections 7 and 9 are connected together by means of turn buckles 10 and links 11, the turn buckles engaging adjacent ends of the links, while the remote ends of the links are connected to lugs 12 on the respective chambers 7 and 9. Connection is made between adjacent rings 7, 8 and 9, by means of nipples 13.

Each of these nipples 13 tapers towards both ends as shown, and the opening in the respective chambers are shaped to fit the taporing ends of the nipples. Thus a tight joint is obtained, to prevent the escape of air at the joints between the sections. As shown in 2, there is a large number of these open nipples 13 between each chamber and the adjacent chamber, so that a free circulation of air is provided from the topmost section 9, through the several sections I -8, to the lowermost section 7.

The bustle pipe 14 encircles the shell at about the level of the lowermost section 8, and itzisgconnected to the chamber 9, by a pluralit-y'of pipes 15, the said pipes being outside of the turn buckle connections 10-11. The blower delivers to the bustle pipe at 16, and the air delivered by the blower passes up 18 of-me'tal; The charging door-sill 19 rests on' the top of this section, and'the cupola shell orstack 20 continues above the sill in the "usual manner,

In use, with the cupola charged, air supplied-'by'the blowers circulates from the bustle pipe, through the conduits 15 to the cham- '25 to thecollectino chamber 7, from whence it *is delivered to the tuyeres. As many sections ber 9,'and by way of the several sections '8 8 are used as may be necessary, and in case it should be desired to remove any of the T next-upper section, sufliciently to clear the sections, this maybe done by jacking up the nipples, after which the damaged section T maybe moved and a new one replaced. This is a distinct advantage, since it does not reas 'part'thereof: should be damaged. Further- 'mojre,"should it be desired that the bottom quire dismantling of the cupola in case a sections be of special alloy metal, they can be so constructed, while the upper sections may be of'the usual material. In practice the sections. 8, as also the sections 7 and 9, if desired, will be, provided withbafiies, to

cause agitation of the. air as it circulates. ':The elements 14 an'd15 may be omitted if desired, the blowers being connected dif'rectly to the element 9 which serves as a windbox. In the event that it will be impractical is, the, exterior of;

to connectthe element 9 directly with the :blowers, the elements 14 and 15 may be'used.

.i In, practice, the air passages 13 would be .1red fuced' in number and increased in size. This mlght be provided'for'by expansion oft-he ringcast ings atthe passages. That the castings would be irregular; V r Y What is claimed as new is V 1. In cupola construction, a body composed of a'pluflrality of hollow rings or chambers substantially,rectangular in cross section ar- "ranged n superposed relatlon to present a f substantially continuous-inner circle, the low- '-e'r mo st chamber having means to connect flwith'the tuyeres, and the uppermost having meajnsto, connect with an air compressor, and-a plurality joieonnectionsbetween each chamber and the adjacent chambers for enabling the circulation of air from the compressor to the tuyeres.

2. In cupola construction, a body composed of a plurality of hollow rings or chambers substantially rectangular in cross section arranged in superposed relation to present a substantially continuous inner circle, the lowermost chamber having means to connect with an air compressor, a plurality of connections between each chamber and the adj acent chambers for enabling the circulation of air from the compressor to the tuyeres,

" each connection including registering oppositely tapered openings in the adjacent walls of the adjacent sections, and nipples fitting the said oppositely tapering openings.

3. In cupola construction, a body composed of a plurality of hollow rings or chambers substantially rectangular in cross section arranged in superposed relation to present a substantially continuous inner circle, the lowermost chamber having means to connect with the tuyeres, and the uppermost having means to connect with an air compressor, a plurality of connections between each chamher and the adjacent chambers for enabling the circulation of air from the compressor to the tuyeres, each connection including registering oppositely tapered openings in the adjacent walls of the adjacent sections, nipples fitting the said oppositely tapering openings, and turn buckle connections between the upper and lowermost section.

4. In cupola construction, a body composed of a plurality of hollow rings or chambers arranged in superposed relation, the lowermost having means to connect with the tuycres, and the uppermost having means to connect with an air compressor, and a plurality of connections between each chamber and the adjacent chambers for enabling the circulation of air from the compressor to the tuyeres, the uppermost and the lowermost section being relatively shallow and relatively wide to extend radially beyond the intermediate sections.

5. In cupola construction, a body composed of a plurality of hollow rings or chambers arranged in superposed relation, the lowermost having means to connect with the tuyeres, and the uppermost having means to connect with an air compressor, and a plurality of connections between each chamber and the adjacent chambers for enabling the circulation of air from the compressor to the tuycres, the uppermost and the lowermost section being relatively shallow and relatively wide to extend radially beyond the intermediate sections, said intermediate sections being relatively deep and relatively narrow.

6. In cupola construction, a body composed of annular boxes or chambers arranged in superposed relation, tubular nipples for connecting the sections, each nipple tapering toward its opposite ends, and the adjacent walls of the adjacent sections having tapering openings to receive the opposite ends of the nipple, and means for clamping all of the sections together on the nipples, the uppermost and lowermost section being of relatively great radial width and of relatively shallow height, said sections having inlet and outlet ports respectively.

7. In cupola construction, a body composed of annular chambered sections arranged in superposed relation, each section being rectangular in cross section, and the sections seating one upon the other to provide for a wall of uniform thickness, communications between the sections, and means in connection with the upper and lower sections for connection with a compressor and the tuyeres re spectively.

8. In cupola construction, a body composed of annular chambered sections arranged in superposed relation, each section being rectangular in cross section, and the sections seating one upon the other to provide for a wall of uniform thickness, communications between the sections, means in connection with the upper and lower sections for connection with a compressor and the tuyeres respectively, the connections between the sections comprising nipples tapering toward each end, and openings in the adjacent walls of adjacent sections shaped to fit the ends of the nipples, and means to draw the sections together upon the nipples.

Signed at Birmingham in the county of Jefferson and State of Alabama this 10th day of November A. D. 1927.

CLARENCE D. BARR.

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