EP0052840A1 - Halterungsanlage oder Abstützung für elektrische Heizelemente in Öfen oder Einrichtungen, die mit keramischen Fasern isoliert sind - Google Patents

Halterungsanlage oder Abstützung für elektrische Heizelemente in Öfen oder Einrichtungen, die mit keramischen Fasern isoliert sind Download PDF

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Publication number
EP0052840A1
EP0052840A1 EP81109656A EP81109656A EP0052840A1 EP 0052840 A1 EP0052840 A1 EP 0052840A1 EP 81109656 A EP81109656 A EP 81109656A EP 81109656 A EP81109656 A EP 81109656A EP 0052840 A1 EP0052840 A1 EP 0052840A1
Authority
EP
European Patent Office
Prior art keywords
hanger
ceramic fiber
support
sustentation
hooks
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.)
Withdrawn
Application number
EP81109656A
Other languages
English (en)
French (fr)
Inventor
Jose Carlos Cazzoli
Roberto Piva
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.)
Kennecott Corp
Original Assignee
Kennecott 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 Kennecott Corp filed Critical Kennecott Corp
Publication of EP0052840A1 publication Critical patent/EP0052840A1/de
Withdrawn legal-status Critical Current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
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/66—Supports or mountings for heaters on or in the wall or roof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F27D1/0009—Comprising ceramic fibre elements
    • F27D1/0013—Comprising ceramic fibre elements the fibre elements being in the form of a folded blanket or a juxtaposition of folded blankets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0036—Linings or walls comprising means for supporting electric resistances in the furnace

Definitions

  • This invention relates to an improved system used to support elements of electric heating in the form of tapes or wire conductors, applicable to the lining of ceramic fiber refractories.
  • the electric resistance supports used normally in this case are usually composed of several pieces, including refractory or stainless steels, of sophisticated manufacture, high cost and are not always available. Therefore, to obtain high temperatures "in-loco" of around 800°C, INOX 310.steel is used, and for 1100°C, INOX 310 or INCONVEL 601 is employed.
  • Such solution of the above problem consists essentially in providing electrically inert pieces of certain structure, proper for insertion into insulating linings of ceramic fiber. Normally such insulating lining is attached to the housing of ; the equipment or a hard refractory layer is applied intermediately or superficially to the walls of the housing with ceramic fiber overlaying the hard refractory.
  • the invention provides a supporting device and system applicable for heating elements of a certain form and structure, described later and illustrated in the attached drawings.
  • Such supporting devices are firmly anchored in the ceramic fiber blankets covering the housing or in pre-molded modules of ceramic fiber, installed on the housing in a state of compression which on the average typically makes up 30% and may use batten strips to adjust for shrinkage between such modules in use.
  • the electrical support system of the invention utilizes a series of ceramic hanger elements having a generally wedge shaped pointed end adapted to be inserted into the ceramic fiber, a coupling member having a generally flat surface generally perpendicular to the axis of said wedge and a hook adapted to support an electrical heater element located at the opposite end of said hanger from said wedge shaped pointed end.
  • the hanger further comprises a coupling portion joining the hook and wedge shaped portion.
  • the coupling member is generally planar and adapted to bear against the ceramic fiber when in use.
  • the wedge shaped portion is composed of at least one planar member generally perpendicular to the plane of the hook and at least one planar member generally in the plane of the hook.
  • FIG. 1 and 2 Illustrated in Figures 1 and 2 is the support device, made by molding and/or sinterization of an electric insulating ceramic material.
  • the device is here shown in the form of a molded device, with an end in the form of hook 1 and the opposite end in the form of a wedge 2.
  • FIGS 7 and 8 there are alternate embodiments of the hanging elements of the invention. These elements generally indicated as 20 differ from the embodiments of Figures 1 and 2 in that they do not have barbs 21, 23 and 25. They further differ as on the flat surface of 7' there are formed a series of ridges 27 and valleys 29 which act to increase the surface area of the hanger element.
  • the hanging elements are coated with a refractory cement prior to insertion into the insulating ceramic fiber.
  • the ceramic fiber is at least partially slit with a knife prior to insertion and then the hanging element coated with the refractory cement is inserted into the cut.
  • the series of ridges and valleys increases the surface area for bonding of the ceramic cement to the ceramic fibers. It further inhibits withdrawal of the hanging element.
  • the materials forming the hanging elements of the invention may be any material which is generally non-conductive and also temperature resistant at the intended'use temperature of the furnace.
  • Typical of materials suitable for the hanger elements of the invention are silicon carbide and alumina.
  • Preferred materials for the system of the invention are mullite for applications up to about 2300°F and cordierite for applications up to about 1600°F as these materials are easily formed, chemically stable and heat shock resistant.
  • the refractory cement utilized in mounting the hangers of the invention may be any material which is operable at -the anticipated temperatures and is suitable for easy application onto the hanger element.
  • Preferred materials are air drying water base refractory cements, such as fire clay refractory cements.
  • the hook part is placed externally from the lining, sometimes in modules of ceramic fiber and in the form of body 3 of a pyramid trunk or similar shape, of a trapezoidal transversal section, pointed outward and on whose end is formed a shoulder of rectangular transversal section of a relatively small height, forming a straight hook 4, leaving a space 5 for placing the electric. resistance in the form of wire or tape.
  • the opposite end 2 has a general shape of a tapered wedge, with point 6 slightly rounded and with projections 7 and 7', to reinforce its anchorage in the insulation or in the respective module of ceramic fiber 10.
  • Projection 7 serves to provide structural'support for the hook 1 and also minimize side movement of the sustentation member.
  • the projections of 7' serve to supply support or bearing surface to support the hangers and electrical heating elements without breaking down the fiber.
  • the hangers of the invention may be any desired size that will provide sufficient anchorage in a particular wall to support the electrical device to be used.
  • A'typical size is about 6-1/2" overall length. The length and thickness will also vary depending on the ceramic material forming the hanger.
  • the coupling piece 9 represented in Figure serves to hold support 1 jointed to wedge 2 which is anchored inside the insulation of ceramic fiber.
  • the coupling piece 9 in contact with the ceramic fiber stabilizes the hook 1 and helps prevent its sagging into the fiber so as to hang down and become dislodged.
  • the devices of support 1, 2 are anchored in the module of ceramic fiber 10, with part 2 firmly fitted under compression and fastened inside insulation 10, with the aid of projections 7, 7' and 31, 33 and 35 serving for sustentation of the electric resistances in the form of wire 11, as is well shown in Figure 4.
  • the supports 1, 2 are found placed in two horizontal rows, with hooks 4 of the upper row turned upward and those of the lower row turned downward, so as to hold wire 11, and to prevent it from slipping.
  • the supports of the lower row are found separated from those of the upper row to the right, as seen in Figure 4 by the observer.
  • Figure 5 is an illustration similar to Figure 4 except that the electric resistance 37 is shown as a ribbon or tape, adapted to space 5 of support 1. In this case it is anchored in the ceramic fiber module 10, also two rows of supports 1 and 2, and in both their hooks are turned outward. As may be seen, in relation to the upper row, the electric resistance 37 in a spiral or helicoid form, rests on the
  • the tape 37 may be fastened to the supports, for example, by a wire of the resistance itself, or another adequate one in case this becomes necessary.
  • FIG. 6 in the lower row, the case of application of spiralled or helicoid resistances of a larger gauge 39 is illustrated.
  • the element 4l is a heater of smaller gauge that may be placed on hook 5.
  • supports of larger dimensions are avoided, with more difficult anchorage in the mass of ceramic fiber, by pieces in the form of a joint double-L forming a type of hanger 12.
  • the upper branch of the junction of pieces in L is simply placed in the space 5 of support 1 and the lower branches of the L will hold the larger size resistance.
  • these parts 12 can be prepared in the form of an L, with dimensions of the lower branch, each of which adapted to each case.
  • Parts 12 can be prepared of any thermal resistant material, which does not need to be properly insulated electrically because of the refractory nature and the insulation of supports 1 and 2.
  • the heating elements of Joule effect of electric resistance are supported on supports 1 and may be fastened to this by a wire of the same material or may be suspended.
  • the fastening of the elements is of interest especially for these heating elements comprising spiral wires on a ceramic core.
  • the type of fastening of the invention eliminates any ; necessity of using refractory or stainless steels, and I generally substitutes a large variety of parts with one piece only with large economy of material and labor.
  • the electric resistance system is very easily assembled, and may be completed in a short period of time even by non- specialized personnel, and therefore at a greatly reduced cost.
  • hanger device Although described with reference to certain preferred embodiments, it would be clear to people skilled in the art that there are other variations in the hanger device and system of the invention which are obvious and are intended to be included by the present specification and claims. Further the hanger device could be formed with a.somewhat differently shaped wedge-shaped surface or with more than one planar member parallel to the plane of the hook. While the hangers and mounting system of the invention have been illustrated as installed in a ceramic fiber module, it is also within the invention to install the system in ceramic fiber wall systems of other construction or to insert the devices into the folded fiber blanket which may be inserted between the modules.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)
  • Furnace Details (AREA)
EP81109656A 1980-11-24 1981-11-12 Halterungsanlage oder Abstützung für elektrische Heizelemente in Öfen oder Einrichtungen, die mit keramischen Fasern isoliert sind Withdrawn EP0052840A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BR8007655 1980-11-24
BR8007655A BR8007655A (pt) 1980-11-24 1980-11-24 Dispositivo de suporte ou sustentacao de elementos de aquecimento eletrico em fornos e em equipamentos,isolados com fibra ceramica

Publications (1)

Publication Number Publication Date
EP0052840A1 true EP0052840A1 (de) 1982-06-02

Family

ID=4024341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109656A Withdrawn EP0052840A1 (de) 1980-11-24 1981-11-12 Halterungsanlage oder Abstützung für elektrische Heizelemente in Öfen oder Einrichtungen, die mit keramischen Fasern isoliert sind

Country Status (4)

Country Link
EP (1) EP0052840A1 (de)
JP (1) JPS57155084A (de)
BR (1) BR8007655A (de)
DE (1) DE52840T1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195765A2 (de) * 1985-03-22 1986-09-24 Kanthal AB Verfahren und Einrichtung zum Aufhängen eines elektrischen Widerstandselements
DE3623377A1 (de) * 1986-07-11 1988-02-25 Roland Abicht Befestigungsvorrichtung fuer elektrische widerstands-heizleiter in einem industrieofen
DE3807721A1 (de) * 1988-03-09 1989-09-28 Abicht Roland Vorrichtung zur halterung von elektrischen heizleitern in industrieoefen
DE3816420A1 (de) * 1988-05-13 1989-11-23 Abicht Roland Vorrichtung zur halterung elektrischer heizleiter in einem industrieofen
GB2288524A (en) * 1994-04-08 1995-10-18 Tfw Dixon & Son Ltd Mounting a heating element on a furnace lining construction
WO2007118650A1 (de) * 2006-04-13 2007-10-25 Boehler Karl-Heinz Befestigungsmittel für elektrische heizwiderstände
EP4230940A1 (de) * 2022-02-21 2023-08-23 John Cockerill S.A. Hochleistungswärmedämmung eines wärmebehandlungsofens zum glühen eines kontinuierlich laufenden bandes

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR655944A (fr) * 1927-06-16 1929-04-25 Thomson Houston Comp Francaise Perfectionnements apportés aux fours électriques
FR1078639A (fr) * 1953-04-03 1954-11-19 Heurtey & Cie Dispositif d'accrochage notamment pour les éléments de chauffage à résistances dans les fours
FR72822E (fr) * 1958-01-21 1960-07-22 Heurtey & Cie Dispositif d'accrochage notamment pour les éléments de chauffage à résistances dans les fours
US4088825A (en) * 1976-08-04 1978-05-09 General Electric Company Electric furnace wall construction
FR2404819A1 (fr) * 1977-09-29 1979-04-27 Roissac Andre Perfectionnements aux fours industriels a chauffage electrique
US4156792A (en) * 1977-09-14 1979-05-29 Bickley Furnaces Incorporated Electric furnace construction
US4272638A (en) * 1979-03-16 1981-06-09 Johns-Manville Corporation Heater element supports for use with fibrous block insulations

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR655944A (fr) * 1927-06-16 1929-04-25 Thomson Houston Comp Francaise Perfectionnements apportés aux fours électriques
FR1078639A (fr) * 1953-04-03 1954-11-19 Heurtey & Cie Dispositif d'accrochage notamment pour les éléments de chauffage à résistances dans les fours
FR72822E (fr) * 1958-01-21 1960-07-22 Heurtey & Cie Dispositif d'accrochage notamment pour les éléments de chauffage à résistances dans les fours
US4088825A (en) * 1976-08-04 1978-05-09 General Electric Company Electric furnace wall construction
US4156792A (en) * 1977-09-14 1979-05-29 Bickley Furnaces Incorporated Electric furnace construction
FR2404819A1 (fr) * 1977-09-29 1979-04-27 Roissac Andre Perfectionnements aux fours industriels a chauffage electrique
US4272638A (en) * 1979-03-16 1981-06-09 Johns-Manville Corporation Heater element supports for use with fibrous block insulations

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0195765A2 (de) * 1985-03-22 1986-09-24 Kanthal AB Verfahren und Einrichtung zum Aufhängen eines elektrischen Widerstandselements
EP0195765A3 (de) * 1985-03-22 1987-05-27 Kanthal AB Verfahren und Einrichtung zum Aufhängen eines elektrischen Widerstandselements
DE3623377A1 (de) * 1986-07-11 1988-02-25 Roland Abicht Befestigungsvorrichtung fuer elektrische widerstands-heizleiter in einem industrieofen
DE3807721A1 (de) * 1988-03-09 1989-09-28 Abicht Roland Vorrichtung zur halterung von elektrischen heizleitern in industrieoefen
DE3816420A1 (de) * 1988-05-13 1989-11-23 Abicht Roland Vorrichtung zur halterung elektrischer heizleiter in einem industrieofen
GB2288524A (en) * 1994-04-08 1995-10-18 Tfw Dixon & Son Ltd Mounting a heating element on a furnace lining construction
WO2007118650A1 (de) * 2006-04-13 2007-10-25 Boehler Karl-Heinz Befestigungsmittel für elektrische heizwiderstände
EP4230940A1 (de) * 2022-02-21 2023-08-23 John Cockerill S.A. Hochleistungswärmedämmung eines wärmebehandlungsofens zum glühen eines kontinuierlich laufenden bandes
WO2023156418A1 (en) * 2022-02-21 2023-08-24 John Cockerill Sa High performance thermal insulation of a heat treatment furnace for annealing a continuously moving strip

Also Published As

Publication number Publication date
DE52840T1 (de) 1983-02-03
JPS57155084A (en) 1982-09-25
BR8007655A (pt) 1982-07-27

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Inventor name: CAZZOLI, JOSE CARLOS

Inventor name: PIVA, ROBERTO