US1278129A - Roasting-furnace shaft. - Google Patents

Description

E. l. FOWLEB.

- RDASTIHG FURNACE SHAFT.

APrucmol msn :uw a. ma.

1-;278,129. Pamasepm, 1918.

UNITED srATEs PATENT oEEicE.

EDWARD J. FOWLEB, OF REDWOOD cirv, CALIFORNIA, AssIeNon To GENERAL CHEMICAL COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

noAsTINe-FUENACE SHAFT. v

Specication of Letters Patent. v Patented Sept. 10, 1918.

Application iled July 3, 1915. Serial No. 37,810.

To all whom t may concern.' p

Be it known that I, EDWARD J. FowL'ER, a citizen of the United States, and a resident of Redwood City, county of San Mateo, and State of California, have invented certain new and useful Improvements in Roasting- Furnace Shafts, of which the following, taken in connection with the accompanying drawings, is a specification.

My invention relates to furnaces, espe cially such as are used for roasting ores, and such as are provided with superposed sta- -tionary hearths upon which the ore is stirred and distributed by rakes or plows aiiixed to rotating arms, said arms being in turn'affixed to androtatable with a central vertical shaft which extends through central apertures in the hearths and is rotated byv any suitable mechanism.

More particularly my invention relates to the central, rotatable shafts of such furnaces, of the type in which longitudinal passages are provided for conducting a cooling medium to and from the rabble arms through a plurality of longitudinally spaced and angularly disposed sets of rabble arm inlet and outlet ports or apertures, and an object of my invention is to produce a shaft in which the passages are provided by partitioning the outer shell of the shaft longitudinally, the partitioning means extending between and separating the inlet and outlet ports of each of said sets. Another object of my invention is to produce a hollow shaft having rabble arm outlet and inlet ports andv means extending between andseparating the said ports, said partitioning means dividing the shaft into unequal cross-sectional portions. Other obhaving partitioning jects of my invention will be pointed out orr will otherwise appear in the following description of an embodiment of my invention in which n' Figure l is -i longitudinal sectional view on the line 1-1 of Fig. 2,

Fig. 2 is a cross-section on the line 2 2 of Fig. l, and

Fig. 3 is a cross-section on the line 3 3 'of Fig. l.

The shaft illustrated is composed of longitudinal articulating sections of which two only are shown in Fig. 1. Each section consists of an outer cylindrical shell 4, provided with rabble arm inlet ports 5 and rabble arm outlet ports 6, the adjacent ports 5, 6

horizontal 'into unequal cross-sectional constituting a-set throughy which a cooling i' medium is conducted to ble arm 7, and the set or sets of ports in one plane being angularly disposed, as shown-at right angles, with reference to the set' or sets in a plane longitudinally -spaced from the first mentioned plane. The rabble arms are, of course, provided with and from each rabthe usual channels for the cooling medium immediately vabove the first mentioned' hearth.

Secured within the shafts, and dividing it into two longitudinal passages 8 and 9, is a partition or vane 10 the peripheral edges of which partition extend between the ports 5, 6 of each set and separates them so that each port 5 is in communication with said longitudinal passage 8 and each port 6 is in communication with said passage 9. The sets of ports are angularly disposed and the partition 8 is curved in the form of a spiral. The intermediate portion of the spiral partition is curved away from the straight diametrically extending line of the edge portions thereof so that a bulged or concavo-convex central part 11 is formed; thus the partition is made to divide the shaftl portions, the portion 8 .being of less cross-sectional area p than the portion 9.

medium is continuously circulated, the. structural means for accomplishing this circulation, a. single partition, being of the ,simplest kind and possessing many advantages of construction and operation. The curved form of this partition which can be cast integrally with the shell 4 or be formed separately and then secured to the. said shell, is

" 'of great practical value because, .among other advantages, it enables the constructional elements to withstand the stresses of unequal expansion without danger of shearing. rlhe bulged part l1 contributes to this end and in addition serves to provide a larger passage i'or the cooling medium after it has been heated and expanded than before it has been heated, thus desirably insurlng a substantially constant velocity oi the medium in the shaft passages.y

.l claim:

Il. A hollow shaft comprising an outer shell provided with a plurality of longitudinally spaced and angularly d1sposed sets 0i rabble arm inlet and outlet ports, and. a single longitudinal non-diametral partition, dividing the shell into two Chambers, common to all of said sets and extending between and separating their inlet and outlet ports.

2. A hollow shaft comprising an outer shell provided with a plurality of longitudinally spaced and angularly disposed sets of rabble arm inlet and outlet ports, and a longitudinal partition of spiral form extending between and separating the inlet and outlet ports of each set.

3. A hollow shaft comprising' van outer shell provided with sets of rabble arm inlet and outlet ports, and. a sin le partition lengthwise of the shaft dividing the same into unequal cross-sectional portions, said partition being common to and extending between and separating the inlet and outlet ports of each set.

4. A hollow shaft comprising an outer shell provided with rabble arm inlet and outlet ports, and a longitudinal .partition extending between and separating said inlet and. outlet'ports, saidpartition being of spiral form and having a concave-convex central portion.

5. In a hollow roastin furnace shaft provided with peripheral ra ble arm apertures, a single substantially longitudinal partition in the shaft, one edge of said partition dividing an arm aperture, andthe partition itself dividing the shaft into two substantially longitudinal but unequal compart ments.

navegas d. ln a hollow roastii'nif furnace shaft having peripheral apertures adapted to establish connection with hollow rabble arms, a single longitudinal non.-diametral vane di viding said. shaft into two compartments for the introduction and igor the discharge or' a cooling medium, the peripheral edges of said vane forming at the said apertures, partitions dividing said apertures into separate openings. K

7. ln a hollow roasting furnace sb ait having apertures adapted to establish connection with hollow rabble arms, a single longitudinal vane dividing said shaft into two separate compartments or the introduction and for the discharge of a cooling medium, the rabble arms and the apertures therefor on alternate hearths being all in the same plane and at right angles to the arms and apertures. on the remaining or intermediate hearths, the 'peripheral edges of said vane intersecting all the apertures and forming at the said apertures partitions dividing said apertures into separate openings. i

8. A hollow shaft comprising an outer shell provided with a plurality of longitudinally spaced sets of rabble arm inlet and 4 outlet ports, the ports of a given set being angularly disposedin the same horizontal plane, anda single non-diametral longitudi. nal partition'therein dividing the shaft into two separate compartments, an edge of "said artition being common to and extending etween and separating the. ports of each and all of said sets.

9. A. hollow shaft comprising an outer shell provided with a plurality of longitudinally spaced and angularly disposed sets of rabble arm inlet and outlet ports and a longitudinally twisted partition extending between and separating the inlet and outlet ports or each set. f

ln witness whereof l have hereunto set my hand in the presence of two subscribing witnesses.

EDWARD J. FO'WLER.

' Witnesses:

E". Bmx, E. lh. Karmann.

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