[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US1333950A - Electric furnace - Google Patents

Electric furnace Download PDF

Info

Publication number
US1333950A
US1333950A US36418A US8641816A US1333950A US 1333950 A US1333950 A US 1333950A US 36418 A US36418 A US 36418A US 8641816 A US8641816 A US 8641816A US 1333950 A US1333950 A US 1333950A
Authority
US
United States
Prior art keywords
furnace
hearth
electrodes
metal
roof
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US36418A
Inventor
Max R Trembour
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LUDLUM ELECTRIC FURNACE Corp
Original Assignee
LUDLUM ELECTRIC FURNACE CORP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LUDLUM ELECTRIC FURNACE CORP filed Critical LUDLUM ELECTRIC FURNACE CORP
Priority to US36418A priority Critical patent/US1333950A/en
Application granted granted Critical
Publication of US1333950A publication Critical patent/US1333950A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D11/00Arrangement of elements for electric heating in or on furnaces
    • F27D11/08Heating by electric discharge, e.g. arc discharge
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00Ohmic-resistance heating
    • H05B3/60Heating arrangements wherein the heating current flows through granular powdered or fluid material, e.g. for salt-bath furnace, electrolytic heating

Definitions

  • My invention relates to electric furnaces, and the object of my invention is to provide a furnace adapted for operation at a minimum cost; together with such elements and combinations as are hereinafter more particularly set forth and claimed.
  • Figure 1 is a plan.
  • Fig. 2 is a section along the lines, cit-40,
  • FIG. 3 is a section along the lines, b?), on Fig. 1.
  • Fig. 4 is a plan of amodified form of my invention.
  • Fig. 5 is a section along the lines, o e, on Fig. 4.
  • Fig. 6 is a section along the lines, d-ai,
  • Fig. 7 is a vertical section of my izurnace showingthe rocker for tilting same.
  • Fig. 8' is an end view of the furnace with the door removed.
  • Fig. 9 is a side elevation showing the furnace tilted in the act of pouring.
  • a furnace of spherical design presents admittedly the least possible surface relative to its bulk. It does not do so, however, relative to its melting capacity, there being tech nical limits to the depths of the metal bath,
  • 'llhe furnace comprises a steel shell, 0, lined with fire brick or other refractory material, 1, and hung upon trunnions ⁇ or set upon rockers, 9, upon which it is adapted to be tilted for pouring out the charge of metal.
  • the turtlc-baclr-shaped roof, 2 is provided troduce the charge, to rve the condition of the charge when operating, and to pour out the melted slag and lllnllfll.
  • the drawings also illustrate electrode-adjustrnents for a variety or melting and fining processes, for which the 'li'urnacc is suitable.
  • 1, 2 and 3 illustrateatc the lining process in a cord nce with the method described in a co-pcnd1ng application, and for which this furnace is especially rcco1n-- mended.
  • This turnace as will be seen from the drawings, is provided with two parallel rows of electrodes, which arrangement would be advisable for furnaces of very large capacity.
  • the electrodes, l and 6, arc spaced away from the slag, 8, and are arcing, while the central electrodes, 5, are contact ing with the metal, 7, without arcing.
  • Figs. 4, 5 and 6 illustrate a furnace with one row of three electrodes, all of which are spaced away and are to the melted bath, 7.
  • the form of the furnace ch rnloer is in general ovoid, or ellipsoidal, all its walls lilting curved. There are no perperlicular sidewalls, no exposed sharp corners and breaks in the lining.
  • the surface of the chamberwalls relative to the charging tonnage (melting capacity) is small, all vertical sections of th chamber, longitudinal as well as lateral, approaching the elliptic form instead of the square or circular.
  • the heat will be generated as liar away as possible from the refractory lining" and roof of the furnace and at the same time along a line, below which the metal hath. reaches its greatest depth. in other words, the heat will be applied to the metal instead oi to the refractory lining.
  • An electric furnace having melting health of generalovoid shape in plan wi. dished hot-tom constricted toward the opposite ends of its major axis, doors at the opposite ends of said inajor axis for cos .ing and discharging the furnace and th ou wl'i-ich access to the interior may he ha repairs, a removable low arched roof of eral like out-line as the hearth. and havin the opposite ends of its major axis completing the door openings of the :7 7 together with vertically adjustah piercing the roof and arrang major axis of the furnace, the c hearth lacing predetermined withvrelation the location the electrodes to afford least practical surface compared to the 1 ing capacity of. the furnace and toconinie heat, prevent radiation loss and insure an even distribution of heat throughout tire hearth. area, the greatest heat being germ erated at the point of greatest depth of melt on the hearth,
  • An electric furnace having a m lt" hearth of general ovoid shape in plan a dished hottorn constricted toward the or, site ends of its major axis and flattened in longitudinal section through. mid removable roof therefor conforming; in eral outline to the outline of the hearth having a similarly flattened mid ares cally registering with that of the he; combination with vertically adjustalne trodes piercing the flattened mid area of the roof and overlying the corresponding area of the hearth, said area of the, hearth sun-- porting tie molten charge at its deepest point and therewith insijiring the generation of the greatest heatat the point at which metal hath is of the greatest depth,
  • An electric-arc furnace comprising an elongated hearth lined with. refractory ma, terial, forming at each end of the loneltudina .cis of the hearth, the sill and sides of a charging or discharging opening, the inner side of said hearth tapering in opposite directions in general ovoid form toward said openings respectively; and an archcdlessees site directions in general ovoid form toward said openings respectively; an arcl'zed-rooff detachably mounted upon said hearth, an

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Description

M. R. TREMBOUR.
ELECTRIC FURNACE.
AFPLlCATlON FILED MAR: 24, 1916.
1,333,950. Y Patented Mar. 16, 1920.
2 SHEETS-SHEET I.
5. TREMBOUH; ELEGTRIC FURNACE. APPL ICATIGN HLED MAR.24, 19H}.
1 333,950. 39mm Mar, 16,1920.
- 2 SHEETS-SHEET 2.
UNITED Max 12.. TREMBOUR, or wnrnnvriar, roan, ASSIGNOE, BY MESNE assrenuznirrs,
'ro LunLuM unscrew roan-son conronarioir, or anemia, newsman, A conno- RATION OF NEW YORK.
ELECTRIC IEUBHACE.
Application filed. March 24., 1916.
ments in Electric Furnaces, of which the following is a specification.
I My invention relates to electric furnaces, and the object of my invention is to provide a furnace adapted for operation at a minimum cost; together with such elements and combinations as are hereinafter more particularly set forth and claimed.
accomplish these objects by means of the mechanism illustrated in the accompanying drawings, in which:
Figure 1 is a plan.
Fig. 2 is a section along the lines, cit-40,
on Fig. l. q
.Fig. 3 is a section along the lines, b?), on Fig. 1.
Fig. 4 is a plan of amodified form of my invention.
Fig. 5 is a section along the lines, o e, on Fig. 4.
Fig. 6 is a section along the lines, d-ai,
on Fig. 4. i
Fig. 7 is a vertical section of my izurnace showingthe rocker for tilting same.
Fig. 8' is an end view of the furnace with the door removed.
Fig. 9 is a side elevation showing the furnace tilted in the act of pouring.
Similar letters refer to similar parts throughout the several views.
The cost of operating anelectric furnace depends mainly upon two factors:
(1) The life of the refractory furnacelining and roof and its a'ccessJoihty for quick repairs, removal and replacement.
(2) The electric power consumption.
Both of these factors are determined by the design of the furnace-chamber, as well as by the arrangement l of the electrodes, upon which depends the osition of the electric arcs in the chamber relative to its walls, roof and doors and to the metal charge.
For the design of the furnace-chamber the following rules may be considered fundamental; -1 v Simplicity and strength in construction, avoiding all sharp turns, breaks and open- Specification of Letters 3.atent.-
hatenteol Mar. 36, E921).
Serial. no. 88,418.
ings as far as possible without impairing .easy accessibility of all parts of the furnacechamber, and smallest possible surface of chamber walls, relative to its metal charge, so as to confine the heat and prevent excessive loss by radiation. Q
frleretofore the chambers of electric are furnaces have been constructed substantially from rectangular to circular in their horizontal as well as in their vertical sections. The electrodes, wherever more than two were used, were accordingly arranged in triangle or square groups around the center of the furnace. This construction necessitated very large or very numerous doors so as to admit access for observation and repairs to allparts of the chamber. Also, as a rule, a special door or spout was provided to pour off the charge. W' hen tilting a furnace of this construction, the wall opposite the spout must necessarily overhang, which often results in its caving in.
A furnace of spherical design presents admittedly the least possible surface relative to its bulk. It does not do so, however, relative to its melting capacity, there being tech nical limits to the depths of the metal bath,
' which in a spherical furnace will form only a small segment of the circle representing the vertical. section of the furnace chamber. 1 have found that a greater economy in operation results, when the chamberof an arc-furnace is oblong, with the doors used for charging and pouring both at the ends of the longer axis of the furnace and the electrodes arranged substantially on this same axis, the furnace being tilted about its shorter axis.
The accompanying drawings illustrate in principle the construction of the furnace chamber and the arrangement of the electrodes; also the contours of the metal bath and the position of the arcs relative to the bath and to the chamber walls.
'llhe furnace comprises a steel shell, 0, lined with lire brick or other refractory material, 1, and hung upon trunnions \or set upon rockers, 9, upon which it is adapted to be tilted for pouring out the charge of metal.
The turtlc-baclr-shaped roof, 2, is provided troduce the charge, to rve the condition of the charge when operating, and to pour out the melted slag and lllnllfll.
The drawings also illustrate electrode-adjustrnents for a variety or melting and fining processes, for which the 'li'urnacc is suitable. 1, 2 and 3 ilustratc the lining process in a cord nce with the method described in a co-pcnd1ng application, and for which this furnace is especially rcco1n-- mended. This turnace, as will be seen from the drawings, is provided with two parallel rows of electrodes, which arrangement would be advisable for furnaces of very large capacity. The electrodes, l and 6, arc spaced away from the slag, 8, and are arcing, while the central electrodes, 5, are contact ing with the metal, 7, without arcing.
Figs. 4, 5 and 6 illustrate a furnace with one row of three electrodes, all of which are spaced away and are to the melted bath, 7.
l have shown in 5 a. furnace equipped with the water-cooled metal electrodes, 10, introduced through the bottom of the furnace and contacting with the metal, ,although I may use arrangement of electrodes in the furnace illustrated in F lgs. 1, 2 and 3, which is without the Water-cooled metal electrodes.
As will he seen from these drawings, the form of the furnace ch: rnloer is in general ovoid, or ellipsoidal, all its walls lilting curved. There are no perperlicular sidewalls, no exposed sharp corners and breaks in the lining. The surface of the chamberwalls relative to the charging tonnage (melting capacity) is small, all vertical sections of th chamber, longitudinal as well as lateral, approaching the elliptic form instead of the square or circular. The chain her tapering from its widest lateral cross-- sections near both ends, leads to the naturallocation of the doors at these ends, insuring easy accessibility to each part of the cham her. The position of the doors at each end of the furnace and parallel to the tilting aXis is a decidedadvantage in charging Well as in pouring the metal, as either door can he used for pouring and can at once he brought into the most convenient position charging. T here being walls parallel to the tilting axis, no part of the lining can. overhang and cave in when the furnace is tilted. (See Fig. 9.)
As the electrodes are arranged along the longer axis, the heat will be generated as liar away as possible from the refractory lining" and roof of the furnace and at the same time along a line, below which the metal hath. reaches its greatest depth. in other words, the heat will be applied to the metal instead oi to the refractory lining.
lVhat claim as my invention and desire to secure by Letters l atcnt is:
An electric furnace having melting health of generalovoid shape in plan wi. dished hot-tom constricted toward the opposite ends of its major axis, doors at the opposite ends of said inajor axis for cos .ing and discharging the furnace and th ou wl'i-ich access to the interior may he ha repairs, a removable low arched roof of eral like out-line as the hearth. and havin the opposite ends of its major axis completing the door openings of the :7 7 together with vertically adjustah piercing the roof and arrang major axis of the furnace, the c hearth lacing predetermined withvrelation the location the electrodes to afford least practical surface compared to the 1 ing capacity of. the furnace and toconinie heat, prevent radiation loss and insure an even distribution of heat throughout tire hearth. area, the greatest heat being germ erated at the point of greatest depth of melt on the hearth,
2, ln a construction such as specific in claim 1, a hearth bottom having an inc tion of less than 45 from mid area the door openings to permit the free discharge the melt when. furnace is rocked through a relatively small An electric furnace having a heat. general ovoid shape and dished bottom doors at the opposite ends of its ina i low arched root meeting sides s hearth and conforming in general outl the outline oi. the hearth and having 5 opposite ends a lire-brick lining compile-1c a. series of transverse parallel arches lerent radii, the terminal arches of radius cooperatingwith the hearth ends to complete the ends of door openings or" the i ornace, substantially as descrihed.
l. An electric furnace having a m lt" hearth of general ovoid shape in plan a dished hottorn constricted toward the or, site ends of its major axis and flattened in longitudinal section through. mid removable roof therefor conforming; in eral outline to the outline of the hearth having a similarly flattened mid ares cally registering with that of the he; combination with vertically adjustalne trodes piercing the flattened mid area of the roof and overlying the corresponding area of the hearth, said area of the, hearth sun-- porting tie molten charge at its deepest point and therewith insijiring the generation of the greatest heatat the point at which metal hath is of the greatest depth,
5. An electric-arc furnace comprising an elongated hearth lined with. refractory ma, terial, forming at each end of the loneltudina .cis of the hearth, the sill and sides of a charging or discharging opening, the inner side of said hearth tapering in opposite directions in general ovoid form toward said openings respectively; and an archcdlessees site directions in general ovoid form toward said openings respectively; an arcl'zed-rooff detachably mounted upon said hearth, an
having a lining of refractory brick forming roof-arches for said openings respectively; means whereby said furnace can he tilted upon anaxis at right angles to its longi tudinal axis; doors for closing said openings respectively; and a plurality of electrodes inserted through said detachable roof along the longer axis of the furnace.
In testimony whereof l. have atiixed. my signature in presence of two Witnesses.
MAX TREMBOUlrl.
US36418A 1916-03-24 1916-03-24 Electric furnace Expired - Lifetime US1333950A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US36418A US1333950A (en) 1916-03-24 1916-03-24 Electric furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US36418A US1333950A (en) 1916-03-24 1916-03-24 Electric furnace

Publications (1)

Publication Number Publication Date
US1333950A true US1333950A (en) 1920-03-16

Family

ID=22198444

Family Applications (1)

Application Number Title Priority Date Filing Date
US36418A Expired - Lifetime US1333950A (en) 1916-03-24 1916-03-24 Electric furnace

Country Status (1)

Country Link
US (1) US1333950A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650255A (en) * 1947-10-31 1953-08-25 Asea Ab Tilting electrical melting furnace of egg shaped cross section
EP0167475A1 (en) * 1984-05-24 1986-01-08 MANNESMANN Aktiengesellschaft Direct current arc heating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2650255A (en) * 1947-10-31 1953-08-25 Asea Ab Tilting electrical melting furnace of egg shaped cross section
EP0167475A1 (en) * 1984-05-24 1986-01-08 MANNESMANN Aktiengesellschaft Direct current arc heating device

Similar Documents

Publication Publication Date Title
US4277638A (en) Prefabricated unit for a DC arc furnace
US2658094A (en) Combined electrode and skimmer for electric glass melting furnaces
US1333950A (en) Electric furnace
US1922312A (en) Electric furnace
US2650255A (en) Tilting electrical melting furnace of egg shaped cross section
US3311361A (en) Induction furnace
ES370104A1 (en) Electric arc furnace for continuously melting scrap iron
US1113778A (en) Electric furnace.
US1445860A (en) Apparatus for treating metals
US2670698A (en) Furnace roof
US2868860A (en) Furnace for steel production
US2060136A (en) Electric furnace
US1542562A (en) Furnace for melting and treating ores and metals generally
US2701269A (en) holden
US1447682A (en) Removable-top continuous kiln
US1808145A (en) Brass-melting apparatus
US1069601A (en) Furnace.
US1691368A (en) Car-bottom furnace-hearth seal
US865016A (en) Electric furnace.
US783736A (en) Electric furnace.
US688393A (en) Electric furnace.
US3519719A (en) Method of operating metallurgical furnaces
US1108924A (en) Electric furnace.
US1013838A (en) Melting-furnace.
US1286794A (en) Electric furnace.