US1595969A - Furnace crucible - Google Patents

Description

Aug. l0, 1926. 1,595,969

M; UNGER FURNACE CRUCIBLE FiledApril 18, 1922 2 sheets-sheet 1 i rig. l.'- 7 H34.

Ang'. 10,1926.

, M. UNGER FURNACE CRUCIBLE Filed April 18, 1922 2 sheetssheet 2 Fig. 6.

Inventar: magnus Unger;

Patented Aug. 10, 1926.

UNiTED STATES PATENT OFFICE.fi-@i HAGNUS UNGEB,

or PITTSFIELD, MASSACHUSETTS, A'ssroNoK'ro onNEnAn'ELEc- Tmc COMPANY, A conronA'rIoN or Nnw max. y s

rUnNAcE cnUcIiBLE.

The present invention com rises a new refractory container' or cruci le which is particularly well adapted for induction fur- IlHCeS.

Heretoiore, furnace crucibles, particularly when providing channels for the circulation of charge, have been constructed by tamping the refractory material in a comminuted state mixed with a binder in a mold containing ya core which could be removed by 'fusion or combustion.y This method O construction required time-consuming drying and baking of large' mass to whlch the air had little or no access and which could not readily be handled or transported.

In accordance with my invention I have provided a crucible consisting of acplurality'.

of preformed members which are a apted to be assembled in telescoping relation in proper position with respect to the other parts of the' furnace. These members can be made and kept in reserve in an quantity, and when aembled permito the immediate resumption of furnace operation. The novel features of my invention will be ointed out with particularity in the appen ed claims.

1 have illustrated in the accompanying drawings two embodiments of my invention ,constituted by crucibles for induction fur- 0 naces each of wt ich is provided with a main reservoir and a communicating channel in which the charge is subjected to heating by induced currents.

Fig. 1 of the drawings is a vertical section of an induction furnace containing a cruci. blc constructed in accordance with my invention; Fig. 2 is a vertical section of the cruciblc with the members partly disengag-cd; Figs. 3 and 4, respectively, represcnt a. vcrtical section and a plan vicw of an assembled crucible.; Figs, 5 and G, respectively, constitute an elevation and a vertical section oi a modiication.

A substantially complete induction fur nace has been shown in Fig. 1 to make plain the relation of the `various parts. The furN nace comprises a magnetic, corc 1 upon which is mounted a primary windingl. The secondary is constituted by thc. charge contained-within a cylindrical channel 3 surrounding the core 1 and axially displaced with respect to the primary winding 2, thereby causing by electromagnetic repulsion a circulation of molten charge l'ictwccn thc channel 'und thc reservoir 4 through the conduits 5, 6. This arrangement.yofl the primary and secondary windings constitutes no part oi"y my present invention. Fig. y1 A"i also for the sake otrcompleteuessshows a cover 7, a chargingdoor Banda-.spout 9, but these are partswith ywhich` myA invention is not concerned. A. heat; insulatingllayer 1() has been diagrammatically indicated.

The furnace-body or Crucible-, as best shown in Figs. 2 and; comprises tubulaimembers 11, 12 adapted to be ncstedto proevide a hollow frame e-'ltoo ed channel fand also a pot or reservoir 13 a apted .to/'engage with the channel with its major-exisat right angles to the major axis of the'members 1li,

cess 14 and a flange 15 upon th`e-j1nterior surface located respectively at oppositeends. i.

gage with' the recessM and the l,flangepl at with the recess '17- a strongcompact-strtleture is produced. ,Themembers11,12iandi 13 may consist of tire brick, ortoth'ergsuitable refractory, materiah' and -aremoldedend fired by the usual methods. A liest"shoiv'vnin Figs. 3 and 4, the. upper surface? effi/.he member 12 isrecessed-to @receivegthe resem voir 13, the joint ,beingy cemented upon gas sembly as indicated` at'18.; g

A preferred method of fcemnting the parts of a crucible consistingof tire brick\is carried out'as follows: A quantity of fire clay or cement rcndcrcd plastic by water is introduced at the shoulder or angle of the joint. The parts to bc, ccnicutcd are brought together. Into the space remaining between the parts, as for example, the space remaining between thc cylindrical members 11 and l2. dry particles of burnt tire brick are introduced which mix with the plastic clav absorbing;r a large part of the moisture. prefer to` use particles passingr 11 to 1/8 inch mesh screen.' These particles are rammed in firmlyaud the joint then may be fired mn'iediately. This method avoids cracking and honey-combing of the cemcnt and results in a. substantially homogeneous cruciblc` Fig. 1 shows at 19 an external clamp for one part of the joint where no shoulder has been provided to insure that no leaka *e of charge should occur. As shown in 'Fig-s. 5

and G the clamp may be constituted by steel straps held together by steel bolts 20. Other and additional clamping means may of course be em loyed.

Figs. 5 an G illustrate a crucible for an induction furnace in which the members 2Q, :23 'are telescopically jointed to provide a looped channel which communicates at opposite ends with the space Within the reservoir 24. An external clamp has been provided as in the crucible shown in Fig. 1.

il furnace crucible constituted of preformed, interlocking or jointed units may be made of refractory material having properties best suited for the desired service without reference to their adaptability to tamp ing into a mold, extra parts properly fired may be kept in stock so that in case of a break in the Crucible repairs may be made promptly.

What I claim as new aud desire to secure by Letters Patent of the United States, is

1. An electric furnace Crucible comprising a plurality of members which when nested. are in contact at separat-ed regions and being shaped to provide a looped channel intermediate said regions of contact.

2. An induction furnace crucible comprising members consisting or preformed refractory material, said members being engage-- able with one another to rovide a channel which is Izlosed upon itseli).

3. An induction furnace crucible comprising separable refractory members which when 1n engagement provide a hollow, annular body having inlet and outlet openin $4.8 An electric induction furnace Crucible comprising a plurality of preformed members ltelescopically joined with one another but otherwise spaced apart to provide a channel.

5. An induction furnace Crucible comprising a plurality of nested cylindrical. members joined at their pcripheries but otherwise separated by a space which provides a charge-receiving c incl, and a con tainer fitted to seid mer-wis and communieating with said channel.

G. An induction furnace cruoible cour prising a plurality of cyiindricai nieml-ers, the inner periphe y one mein ber being sealed to (he outer peripl'icry of the other member at opposite ends1 said members otherwise being separated by a space a third cylindrical member fitted to the side wall of the outermost of said nested members and conduite connecting the space between said nested members with the space within said cylindrical member.

7. An induction furnace crucible comprising a cylinder of refractory vmatr-.rial haring a recess and a. Hangs respectively :1t opposite ends on the inte ior surface, a second cylinder' haring a recess and a iangc respectively.:upon the exterior surface, the,l [lange ot' one cylinder engaging with the recess ot another cylinder spacing apart said cylinders to'provide an annular charge1 receiving channel, and a third cylinder cngaging with said first-named cylinder with the major axis at right angles to the major axis of said nested cylinders, and communieating with said annular charge-receiving channel.

In witness whereof, l have hereunto set my hand this 17th day of April,

MAGUS UNSER.

Gli

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