EP0294623B1 - Halterungselement aus Graphit für Heizstäbe in Industrieöfen - Google Patents

Halterungselement aus Graphit für Heizstäbe in Industrieöfen Download PDF

Info

Publication number
EP0294623B1
EP0294623B1 EP88107929A EP88107929A EP0294623B1 EP 0294623 B1 EP0294623 B1 EP 0294623B1 EP 88107929 A EP88107929 A EP 88107929A EP 88107929 A EP88107929 A EP 88107929A EP 0294623 B1 EP0294623 B1 EP 0294623B1
Authority
EP
European Patent Office
Prior art keywords
graphite
heating
industrial furnaces
laminate
heating bars
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
EP88107929A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0294623A2 (de
EP0294623A3 (en
Inventor
Wolfgang Dipl.-Ing. Heise
Georg Dipl.-Ing. Kell
Rolf Schuster
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Priority to AT88107929T priority Critical patent/ATE69683T1/de
Publication of EP0294623A2 publication Critical patent/EP0294623A2/de
Publication of EP0294623A3 publication Critical patent/EP0294623A3/de
Application granted granted Critical
Publication of EP0294623B1 publication Critical patent/EP0294623B1/de
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
    • H05B3/62—Heating elements specially adapted for furnaces
    • H05B3/66—Supports or mountings for heaters on or in the wall or roof

Definitions

  • the graphite heating elements For certain types of industrial furnaces, the graphite heating elements must be attached at their ends, i.e. near the end faces of the furnace chamber, due to the design and the subject matter.
  • Graphite blocks can in turn be used as fastening elements.
  • Graphite rings or graphite rings divided into several sectors (when graphite heating elements are connected in parallel) are also used. Blocks and rings effect both the mechanical fastening and the electrical supply. As a result, however, the heating elements are firmly clamped on both sides. The thermal linear expansion of the heating pipes therefore often leads to the graphite rings breaking. See, for example, document FR-A-1491 108.
  • this object is achieved in that they consist of circular rings or circular ring sectors provided with corresponding bores provided for fastening the heating rods and made of a flexible graphite laminate plate, the layer structure of the laminate having to be perpendicular to the heating rod axis.
  • the dimensions of the circular ring sectors are chosen such that the height H of the circular ring sectors is greater than the width B, measured in the direction of the heating elements. Preferably applies 2 ⁇ H / W ⁇ 8 .
  • These graphite laminate support elements withstand the operating conditions of the furnace and are flexible enough to absorb the thermal expansion of the heating elements without reducing the mechanical strength. In addition, they have good electrical conductivity so that they can also function as current conductors.
  • the support elements are manufactured in such a way that appropriate rings are cut out of commercially available graphite laminate plates and, if necessary, divided into sectors, so that the heating rods can be heated section by section independently of one another.
  • the heating rods are fastened with the help of corresponding holes in the mounting elements.
  • the attachment is preferably carried out by means of a nut and lock nut.
  • the specific electrical resistance in the pressing direction of the graphite laminate is smaller by a factor of 1/65 than transverse to the pressing direction, the laminate strips are cut in such a way that the current flow direction coincides with the laminate length orientation. Furthermore, since the specific electrical resistance of the graphite laminate in the layer direction is equal to that of solid graphite ( ⁇ 10 ⁇ ⁇ m), the electrical characteristics of the furnace do not change.
  • the mounting element Due to the laminate layer structure of the adhesive line element perpendicular to the thermal expansion direction of the heating rods, the mounting element is flexible enough to withstand deflections of different amounts and different directions at the clamping points of the heating rods.
  • the ohmic resistance of the sectors can be adjusted relative to the ohmic resistance of the heating conductors by suitable selection of the cross section of the circular ring sectors (within the variation side of H and B).
  • the heating power supplied to the furnace at the end faces can thus be varied, i.e. the fastening elements as additional heating elements in the furnace chamber.
  • the illustration schematically shows an exemplary embodiment of the mounting elements according to the invention.
  • Two heating rods (2) are fastened at both ends in a mounting element (1) made of graphite laminate by means of a nut (3) and a lock nut (4), the mounting elements (1) having bores at these points.
  • the holding elements (1) are in turn attached to the furnace wall via graphite blocks (5) which penetrate the furnace insulation (6).
  • the layer structure of the graphite laminate runs perpendicular to the heating rod axis.

Landscapes

  • Resistance Heating (AREA)
  • Furnace Details (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)
EP88107929A 1987-06-06 1988-05-18 Halterungselement aus Graphit für Heizstäbe in Industrieöfen Expired - Lifetime EP0294623B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88107929T ATE69683T1 (de) 1987-06-06 1988-05-18 Halterungselement aus graphit fuer heizstaebe in industrieoefen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873719045 DE3719045A1 (de) 1987-06-06 1987-06-06 Halterungselemente aus graphit fuer heizstaebe in industrieoefen
DE3719045 1987-06-06

Publications (3)

Publication Number Publication Date
EP0294623A2 EP0294623A2 (de) 1988-12-14
EP0294623A3 EP0294623A3 (en) 1989-03-22
EP0294623B1 true EP0294623B1 (de) 1991-11-21

Family

ID=6329230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88107929A Expired - Lifetime EP0294623B1 (de) 1987-06-06 1988-05-18 Halterungselement aus Graphit für Heizstäbe in Industrieöfen

Country Status (9)

Country Link
US (1) US4870256A (xx)
EP (1) EP0294623B1 (xx)
JP (1) JPS646390A (xx)
AT (1) ATE69683T1 (xx)
BG (1) BG49510A3 (xx)
BR (1) BR8802680A (xx)
DE (2) DE3719045A1 (xx)
FI (1) FI87966C (xx)
IN (1) IN168656B (xx)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6777086B2 (en) 2001-08-31 2004-08-17 Julian Norley Laminates prepared from impregnated flexible graphite sheets
US6689992B1 (en) * 2002-01-31 2004-02-10 Sierratherm Production Furnaces, Inc. Connector for an electrical heating element
SE531836C2 (sv) * 2007-12-05 2009-08-25 Sandvik Intellectual Property Upphängningsanordning för tilledare för elektriska motståndselement
EP2610570B1 (en) * 2011-12-29 2016-11-23 Ipsen, Inc. Heating element arrangement for a vacuum heat treating furnace
DE102012209278B4 (de) * 2012-06-01 2018-04-12 Kgt Graphit Technologie Gmbh Suszeptor

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1873053A (en) * 1925-09-03 1932-08-23 Globar Corp Electrical heating apparatus
FR1121392A (fr) * 1955-03-28 1956-08-13 Perfectionnement aux fours électriques
FR1271869A (fr) * 1960-10-15 1961-09-15 Balzers Hochvakuum Procédé et appareil pour amener le courant à un corps chauffant à résistance électrique
GB1123606A (en) * 1965-09-03 1968-08-14 Atomic Energy Of Australia Improvements in electric resistance furnaces
GB1178677A (en) * 1966-03-11 1970-01-21 Efco Royce Furnaces Ltd Improvements relating to Heating Element Assemblies for Electric Furnaces
FR1491108A (fr) * 1966-09-02 1967-08-04 Australlian Atomic Energy Comm Fours à résistance électrique pour le chauffage à des températures élevées
US3476862A (en) * 1968-05-16 1969-11-04 Abar Corp Electric resistance heating elements
DE2646890C2 (de) * 1976-10-16 1979-09-06 Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler, 6000 Frankfurt Vakuumofen mit Graphitheizung
US4429403A (en) * 1981-09-30 1984-01-31 Vac-Aero International Inc. Heating element insulating and support system
DE8708084U1 (de) * 1987-06-06 1987-08-06 Degussa Ag, 6000 Frankfurt Halterungselemente aus Graphit für Heizstäbe in Industrieöfen

Also Published As

Publication number Publication date
DE3866287D1 (de) 1992-01-02
FI882207A (fi) 1988-12-07
EP0294623A2 (de) 1988-12-14
JPS646390A (en) 1989-01-10
ATE69683T1 (de) 1991-12-15
FI87966B (fi) 1992-11-30
DE3719045A1 (de) 1988-12-15
EP0294623A3 (en) 1989-03-22
FI882207A0 (fi) 1988-05-11
BG49510A3 (en) 1991-11-15
BR8802680A (pt) 1988-12-27
US4870256A (en) 1989-09-26
FI87966C (fi) 1993-03-10
IN168656B (xx) 1991-05-18

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