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US2820075A - Fused bath electrical furnace - Google Patents

Fused bath electrical furnace Download PDF

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Publication number
US2820075A
US2820075A US542302A US54230255A US2820075A US 2820075 A US2820075 A US 2820075A US 542302 A US542302 A US 542302A US 54230255 A US54230255 A US 54230255A US 2820075 A US2820075 A US 2820075A
Authority
US
United States
Prior art keywords
electrode
bath
electrodes
furnace
electrical
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
US542302A
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English (en)
Inventor
Richard C Upton
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to US542302A priority Critical patent/US2820075A/en
Priority to ES0230407A priority patent/ES230407A1/es
Application granted granted Critical
Publication of US2820075A publication Critical patent/US2820075A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/03—Electrodes

Definitions

  • the invention relates to electrical furnaces of the fused salt bath type. It is the object of the invention to obtain a construction in which the electrodes may be continuously replaced without interruption of the operation of the furnace. Itis a further object to reduce the heat losses due t-o outward thermal conduction through the electrodes. With these objects in view the invention consists in a construction in which the electrodes extend into the bath from below the surface thereof to project only a limited distance therein. The invention further consists in means for intermittently advancing the electrodes as the inner end portion thereof wastes away and further in the more specific construction as hereinafter set forth.
  • Fig. l is a sectional elevation showing a portion of an electrical heat treating furnace of the fused bath type.
  • Fig. 2 is a section on line 2 2, Fig. 1.
  • Fig. 3 is an end elevation of the electrode and its connections.
  • the electrodes In the construction of electrical furnaces of the fused salt bath type the electrodes extend into the bath to introduce the electrical energy thereinto.
  • contact between the electrode and the bath is of considerable area for the passage of a relatively large current volume at relatively low voltage. While there are certain advantages resulting from such extended contact area there are also detrimental features, such as the necessity of shutting down the furnace when renewal of the electrodes is required.
  • loss of energy through outward thermal conduction of the electrodes is excessive.
  • With my improved construction only the inner end portions of the electrodes contact with the bath which greatly reduces the extent of contact area. This reduces loss due to outward thermal conduction but requires a higher Voltage for the introduction of the required electrical energy. Further saving is effected by reducing the diameter of the electrodes and still further increasing the voltage. As there are no obstructions at their inner ends the electrodes may be advanced into the bath as they waste away and this advancement may be continued by successive end abutting sections of electrodes and without interruption in the operation of the furnace.
  • A is an electrical heat treating furnace of the fused bath type having opposite retaining walls A' and A2.
  • B are electrodes extending through apertures in said walls, preferably directly opposite and in registration with each other. These electrodes need not project into the bath to any considerable extent beyond the inner surfaces of the retaining walls and, therefore, present only limited surface contact with the bath. As they waste away the electrodes may be intermittently advanced inward and such operations may be continued indefinitely.
  • the means for advancing the electrodes into the furnace includes a beam C, such as a channel beam, which extends outward from the furnace wall beneath the electrode and which is anchored at its inner end to a supporting frame D. Adjustably secured within this channel member is an angle member E, the
  • Patented Jan. 14, 1958 ice vertical flange E' of which extends upward in rear of the outer end of the electrode.
  • a screw F threadedly engaging the flange E bears against a metallic block G, which in turn bears against an insulator block H, which contacts the end of the electrode.
  • the sides of the channel bar are provided with a series of spaced registering apertures C' through which a pin C2 may be passed and a bushing C3 sleeved on this pin is located in the angle of the member E to retain it in its adjusted position.
  • the screw F is used for adjusting the electrode as its inner end wastes away and when the limit of adjustment of said screw is reached the pin C2 is withdrawn and the member E. adjusted into registration with another pair of the apertures C3.
  • a helical coil I of tubing Surrounding this outer portion of the electrode is a helical coil I of tubing, leaving an accurate space between the same and the electrode. This space is occupied by a series of metallic conductors I extending longitudinally of the electrode and at their outer ends connected by a plate I with a flexible electrical conductor cable J2.
  • the helical coil is resilient and the convolutions thereof are normally of a diameter to permit of adjustment of the electrode longitudinally within the coil and conductors J. if, however, the opposite ends of the coil are angularly adjusted about its axis in a direction to wind up the helix, this will produce clamping pressure against the conductors J and through them against the electrode B.
  • Such adjustment is provided for by tangential extensions I of the opposite end convolutions of the coil, links i2 extending laterally from the upper ends of said extensions, posts I3 extending upward from the beam C, and screws I4 between said posts and links for adjusting the latter.
  • the coil I and conductors I may be rmly clamped against the electrode to provide good electrical and thermal conduction and whenever it is necessary to adjust the electrode this clamping pressure may be released by the screws I4.
  • Insulators I5 between the extensions l' and the links l2 prevent loss of electrical current through this connection.
  • the helix is connected by flexible conduits K to any suitable source of coolingizid to be passed through the coil.
  • an electrode extending through an aperture in a bath wall into the bath from below the upper surface thereof to contact therewith through only the limited surface area of the inner end portion of said electrode not greatly in excess of the cross section, means for advancing said electrode as said end portion wastes away to project said inner end portion only slightly into said bath, means for supplying current to said electrode at sufficiently high voltage to introduce the required electrical energy for heat generation to maintain the bath at desired temperature, in which said current supplying means, together with heat dissipating means, surrounds the portion of the electrode outside the bath wall with freedom for longitudinal adjustment of said electrode therethrough, and means for clamping said surrounding means to said electrode to form good electrical and thermal conductivity therebetween.

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  • Resistance Heating (AREA)
  • Furnace Details (AREA)
US542302A 1955-10-24 1955-10-24 Fused bath electrical furnace Expired - Lifetime US2820075A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US542302A US2820075A (en) 1955-10-24 1955-10-24 Fused bath electrical furnace
ES0230407A ES230407A1 (es) 1955-10-24 1956-08-16 Mejoras introducidas en los hornos eléctricos del tipo de bano de sal fundida

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US542302A US2820075A (en) 1955-10-24 1955-10-24 Fused bath electrical furnace

Publications (1)

Publication Number Publication Date
US2820075A true US2820075A (en) 1958-01-14

Family

ID=24163210

Family Applications (1)

Application Number Title Priority Date Filing Date
US542302A Expired - Lifetime US2820075A (en) 1955-10-24 1955-10-24 Fused bath electrical furnace

Country Status (2)

Country Link
US (1) US2820075A (es)
ES (1) ES230407A1 (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420937A (en) * 1967-02-20 1969-01-07 Norman W Upton Apparatus and process for the manufacture of chemical reaction products
US3703622A (en) * 1971-12-01 1972-11-21 Conley & Kleppen Ets Gas-shielded arc torch
US4222554A (en) * 1978-12-06 1980-09-16 Upton Industries, Inc. Electric salt bath furnace

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1615109A (en) * 1923-04-03 1927-01-18 American Brass Co Electric furnace
US2355761A (en) * 1943-04-23 1944-08-15 Commerce Pattern Foundry & Mac Electrically heated molten bath furnace
US2464008A (en) * 1945-10-10 1949-03-08 Commerce Pattern Foundry & Mac Continuous replenishment of electrodes in electric salt bath structures
US2512206A (en) * 1947-09-09 1950-06-20 Holden Electric salt bath furnace
US2526241A (en) * 1947-05-21 1950-10-17 Saint Gobain Electrode seal for glass furnaces
US2693498A (en) * 1953-08-03 1954-11-02 Harvey L Penberthy Electrode assembly for glass furnaces

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1615109A (en) * 1923-04-03 1927-01-18 American Brass Co Electric furnace
US2355761A (en) * 1943-04-23 1944-08-15 Commerce Pattern Foundry & Mac Electrically heated molten bath furnace
US2464008A (en) * 1945-10-10 1949-03-08 Commerce Pattern Foundry & Mac Continuous replenishment of electrodes in electric salt bath structures
US2526241A (en) * 1947-05-21 1950-10-17 Saint Gobain Electrode seal for glass furnaces
US2512206A (en) * 1947-09-09 1950-06-20 Holden Electric salt bath furnace
US2693498A (en) * 1953-08-03 1954-11-02 Harvey L Penberthy Electrode assembly for glass furnaces

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3420937A (en) * 1967-02-20 1969-01-07 Norman W Upton Apparatus and process for the manufacture of chemical reaction products
US3703622A (en) * 1971-12-01 1972-11-21 Conley & Kleppen Ets Gas-shielded arc torch
US4222554A (en) * 1978-12-06 1980-09-16 Upton Industries, Inc. Electric salt bath furnace

Also Published As

Publication number Publication date
ES230407A1 (es) 1957-03-01

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