US1418773A - Furnace - Google Patents

Description

W. K BOOTH.

FURNACE- APPLICATION FILED DEC13. 1919.

1,41 ,773,. v Patent-ed June 6, 1922,

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w. K.VBOOTH.

FURNACE.

APPLICATI ON FlLED DEC. 3. I919.

1,418,773. Patented June 6, 1922;.

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WILLIAM "1;. room, or cmcAeo, rumors, ssrouoa 'ro THE BOOTH nmc'rmc 1 summer. 00., or CHICAGO, rumors,- A CORPORATION or rumors.

FURNACE.

Specification of Letters Patent. Patented 11113 6 1922 Application filed December-3, 1919. Serial No. 342,131,

To all whom it may concern:

' Be it known that 1, WILLIAM BOOTH, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new. and useful Improvement in Furnaces, of which the following is a specification.

The present invention relates to furnaces for melting metals, and for metallurgical purposes, and more particularly to electric furnaces having 0 lindrical bodies;

The primary object is to provide an improved furnace .of this character having special provision for' lining the furnace, and for renewing the lining economically and with facility.

Heretofore it has been the practice to line such furnaces with a large number of fireclay bricks} laid in a suitable cement, or mortar. This results in a large number of joints in the furnace, and in the operation of such a'furnace the joints are quickly attacked, leading to quickdeterioration and destruction of the lining. Such a lining is especially susceptible to quick deterioration when the furnace is used for. melting materials which contain lead, or other constituents whichbecome hi hly fluid when melted; and it is very di cult to make a joint which will not allow a highly fluid molten'met al to see through the joints and collectbaok of the 'nin'g, thereby reducing the' eflicienc of the furnace and tending to nick deterioration of the furnace These ifliculties' have been recognized, but here 'tofore 3 no practical method of overcoming I {them has .;been. devised. Ithas been pro} posed to tamp a lining in position in this type (of furnacelining the same, when. necessary, is facili ta'ted by the invention herein described.

' a The but'such ameth'od has not proven' racticable, v w

iflicultiesnoted above are obviated andthc construction of the furnace and re- The invention is'illustrated in its preferred embodiment in the acompanying 1 represents 'a vertical sectional view of' an 1m Q roved [furnace embodying the invention,-,., ig.2, an outerface view of "one of min" employed; andFi ..,3',"-ja sec- I .v '3 tionalTfyiew"-s1 owing a modification "of the molded annular-dining In the; illustration" given, represents a tionsfcf the 1 melted sectional re} a radial extension. 4

cylindrical furnace-body which is equipped with annular supporting tracks A, which encircle and are insulatingly mounted on the furnace-body and which serve as annular contact members; B, B, represent shoes, or contact members, which engage the members A and are supplied with current through conductors B fromany suitable electric source (not'shown) C, C, supporting rolls for the furnace-body, which support the furnace-body through the medium of annular tracks A, the mechanism C being provided with means (not shown) whereby the furnace-body) may be rotated or oscillated on its axis; D, a pair of electrodes which extend through the end-walls of the furnace and are carried by electrode clamps D mounted on frames D sup orted on the endwalls of the furnace; and E, flexible electric conductors connecting the annular contact members A with the electrode clamps In the illustration given, one of the electrode supporting frames D is carried by the end plate 1, secured to one of the end walls of the furnace-body; and the other electrode supporting frame is carried by a door 2, which is mounted on the end wall of the furnace and serves as a closure for a charging opening 2* in one of the end-sections of the lining.

As shown in Fig. 1, the lining comprises an .annular body 3 of-molded refractory material, such as fireclay, this annular body being in the form'of a complete integral annulus; a pair of molded end-sections 4'and 5 which flank the annulus 3 and are composed of suitable refractory material, such as fire- .clay; and a packing of heat insulation ends with outturned flanges 7; and a pair of sheet-metal end-plates 7 which are detachably secured to the flanges 7? by means of bolts 7.

The molded. end-section 4 of the lining is in the form of a heavy disk, which is provided with a central opening 4* for the electrode. The disk 4 is provided on its .outer' surface with a raised portion, or embossment, 4,. wh ch is somewhat in the nature of a hub, this hub being provided with The embossment is loo adapted to bear against the sheet-metal endlate 7*, and'the surrounding space is filled y the packing material 6. The radial extension 4 of the embossment is provided with a tap-hole 4", which is counter-sunk at its outer end to receive the reduced inner end of the lining 8 of a discharge spout 9. The tap-hole is adapted to be closed by a plug of fireclay 10. I

The door 2 is provided with a refractory lining 11, within which is inserted awatercooled sleeve 12. The central perforation through the disk 4 is provided with a counter-sink which receives a water-cooled sleeve 12 The molded end-section 5 has its outer surface provided with a hub-extension 5%, which bears against the end-plate 7 The surrounding space is filledwith the insulation packing material 6. The charging opening 2 extends "through the end-section 5.

In operation, the furnace-body is sup ported and. rotated, or oscillated, through the medium of the rollers C; the annular contact members Aare energized throu h the medium of the shoes, or brushes, and the current passes through the conductors E to the electrode clamps, and the 'circuit is completed through the electrodes and an are 13 between the inner ends thereof. It will be noted that the principal joints which are subjected to the direct action of the molten metal in the furnace are the circumferential joints 14 at what may be termed the. annular corners of the furnace. Because of their location, these joints have a tendency to clo or fill up in the corners of the "furnace, t us protecting the joints. When it becomes necessary, however, to reline the furnace, this may readily be effected by removing the right-hand end-plate shown in Fig. 1 and substituting a new lining. In putting the lining in place in the first instance, or in renewing the lining, the. packing material 6 may be tamped against the left-hand. end-plate 7 a suitable form being employed, if desired, to retain a space for the embossment, or projection, 4, of the melted end-section 4. It will be noted from Fig. 2 that the embossment is rovided with a bevel ortion 4, which enabl s the molded end-section of the linin to be forced into proper position with acility. After the end-section 4 is in position, the annular section 3 may be inserted'and the packing material 6 tamped into the annular space surrounding the section 3. The remainder of the work of lining the furnace may be completed in an-obvious manner.

Fig. 3 illustrates a modification of the molded annular lining body, which may be employed for furnaces of too great len 11 to render it convenient to make the annu us of one section. Thus, the annulu may be composed of two annular sections 3 and 3*, one of which has a reduced extension 3 which fits into a corresponding annular recess in the other section. Thus, preferably, the joint is broken, or off-set, at the junction plane. Y I

The foregoing detailed description been given for clearness of understanding only, and no unnecessary limitation should be understood therefrom, but the appended claims vshould be construed as broadly as permissible, in view of the prior art.

What I regard as new, and desire to se cure by Letters Patent, is:

1. A furnace-body, comprising an annular metal shell provided with a detachable endplate, and a lining of molded sections of refractory material insertable through the end. of said shell and comprising an annular body having a substantially cylindrical molded integral section and a pair of endsections flanking said annular body.

2. A furnace-body, comprising an annular metal shell provided with a detachable endplate, a lining of molded sections of refractory material insertable through the end of said shell and comprising an annular body having a substantially cylindrical molded integral section and a pair of end-sections flanking said annular body, and a packing of heat insulation material interposed between said molded sections and said shell.

3. A furnace body, comprising an annular metal shell provided with a detachable end plate and a lining of molded sections of refractory material insertable through the end of said shell and comprising an annular body having a substantially cylindrical molded integral section and a pair of end sections flanking said annular body, said end-sections having hub-portions bearing against the end-plates of the metal shell, and a packing of heat insulation material interposed between said molded sections and said shell.

4. A furnace-body, comprising an annular metal shell provided with detachable'endplates and a lining of molded sections of refractory material insertable. through the end of said shell and comprising an annular body having a substantially cylindrical molded integral section and a pair of endsections flanking said annular body, said end-sections having their outer 1 surfaces provided with hub-extensions and having opeiings through which electrodes may exten 5. A furnace-body. comprising an annular metal shell provided with detachable endplates and a lining of molded sections of refractory material insertable through the end of said shell and comprising an annular body having a substantially cylindrical section and a pair of end-sections flanking said annular body, one of said end-sections having its outer surface equipped with a hubportion and a radial extension with a tapopening extending therethrough, and a spout applied to the corresponding end of the furnace and having a refractory lining provided with an extension fitted into a counter-sink at the outer end of said tap-hole.

6. A furnace lining, comprising an annular body which includes a molded cylindrical integral section and a pair of molded end-sections flanking said annular body.

7. A furnace lining, comprising an in-- tegral molded annular section of refractory material and a pair of molded end-sections of refractory material flanking said annular body.

' 8. A furnace lining, comprising a plurality of abutting molded integral annular sections of refractory material and a pair of molded end-sections of refractory material flanking said annular body and proyided with-central openings through Which electrodes may extend.

- WILLIAM K. BOOTH.

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