EP0858084A1 - Herstellungsverfahren für geschützte Widerstandselemente und nach diesem Verfahren hergestelltes Widerstandselement - Google Patents

Herstellungsverfahren für geschützte Widerstandselemente und nach diesem Verfahren hergestelltes Widerstandselement Download PDF

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Publication number
EP0858084A1
EP0858084A1 EP98100433A EP98100433A EP0858084A1 EP 0858084 A1 EP0858084 A1 EP 0858084A1 EP 98100433 A EP98100433 A EP 98100433A EP 98100433 A EP98100433 A EP 98100433A EP 0858084 A1 EP0858084 A1 EP 0858084A1
Authority
EP
European Patent Office
Prior art keywords
sheath
conductor
resistance element
constructing
applying
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Withdrawn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
EP98100433A
Other languages
English (en)
French (fr)
Inventor
Duilio Capraro
Roberto Colombo
Danilo Papa
Gino Sonego
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.)
IRCA SpA Industria Resistenze Corazzate e Affini
Original Assignee
IRCA SpA Industria Resistenze Corazzate e Affini
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 IRCA SpA Industria Resistenze Corazzate e Affini filed Critical IRCA SpA Industria Resistenze Corazzate e Affini
Publication of EP0858084A1 publication Critical patent/EP0858084A1/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Withdrawn legal-status Critical Current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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/028—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath
    • H01C1/03—Housing; Enclosing; Embedding; Filling the housing or enclosure the resistive element being embedded in insulation with outer enclosing sheath with powdered insulation
    • 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
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material
    • H05B3/52—Apparatus or processes for filling or compressing insulating material in tubes

Definitions

  • This invention relates to a method for constructing armoured resistance elements, and a resistance element obtained by the method.
  • Methods for constructing armoured resistance elements are known. These methods generally involve inserting into a metal sheath a resistive conductor with its end conductor terminals projecting from said sheath, fixing the conductor with insulating material (granular MgO), then rolling the sheath to reduce its diameter and compact the insulating material. After annealing the resistance element to improve its bendability, a silicone oil is applied to the end of the insulating material. Two insulating spacers preferably of steatite are then applied to the ends of the sheath.
  • insulating material granular MgO
  • the solution of firstly applying the two spacers and then annealing the resistance element does not enable the sheath to be completely annealed (ie along its entire lenght) because the two spacers would burn, so prejudicing the bendability of the element.
  • the object of the invention is to eliminate these drawbacks by providing a method for constructing a resistance element which prior to its use maintains its hermetic seal with time.
  • the method for constructing armoured resistance elements comprises inserting into a steel sheath 2 a conductor 4 of ferro-nickel alloy so that both its ends project from the sheath.
  • Said conductor is maintained fixed within said sheath by an insulating material 6, preferably granular magnesium oxide.
  • the sheath is then rolled to reduce its diameter and compact the magnesium oxide. It is then annealed in an oxidizing furnace to improve the bendability of the sheath.
  • both ends of the insulating material 6 are impregnated with a dielectric fluid 8 in the form of silicone oil.
  • a mushroom-shaped teflon plug 10 having a head 11 which adheres to the silicone oil 8, and a shank 12 which emerges from the end of the sheath 2.
  • the sheath prepared in this manner is then swaged at its ends so that these assume a frusto-conical form to contact the shank 12 of the plug 10.
  • a traditional terminal 14 is then welded to the ends of the metal conductor.
  • the resistance element obtained by the method of the invention has the advantage of considerable resistance and sealing towards moisture during storage, and the ability to "transpire" during operation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Resistance Heating (AREA)
  • Thermistors And Varistors (AREA)
EP98100433A 1997-02-07 1998-01-13 Herstellungsverfahren für geschützte Widerstandselemente und nach diesem Verfahren hergestelltes Widerstandselement Withdrawn EP0858084A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT97VE000005 IT1294562B1 (it) 1997-02-07 1997-02-07 Procedimento di realizzazione di resistenze corazzate e resistenza ottenuta con il procedimento.
ITVE970005 1997-02-07

Publications (1)

Publication Number Publication Date
EP0858084A1 true EP0858084A1 (de) 1998-08-12

Family

ID=11424236

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98100433A Withdrawn EP0858084A1 (de) 1997-02-07 1998-01-13 Herstellungsverfahren für geschützte Widerstandselemente und nach diesem Verfahren hergestelltes Widerstandselement

Country Status (2)

Country Link
EP (1) EP0858084A1 (de)
IT (1) IT1294562B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1448023A1 (de) * 2003-02-13 2004-08-18 Ngk Spark Plug Co., Ltd. Verfahren zur Herstellung eines Patronenheizkörpers und Verfahren zur Herstellung einer Glühkerze
WO2008137101A1 (en) * 2007-05-04 2008-11-13 Xtreme Bolting Service, Inc. Compact, portable resistance heating device
WO2011036105A1 (de) * 2009-09-25 2011-03-31 E.G.O. Elektro-Gerätebau GmbH Rohrheizkörper und verfahren zur herstellung eines solchen rohrheizkörpers
DE112013002131B4 (de) 2012-04-20 2022-09-29 Sanden Holdings Corporation Heizapparat

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2021908A (en) * 1978-05-11 1979-12-05 Irca Spa Sealing the terminations of metal sheathed resistances
EP0010275A1 (de) * 1978-10-13 1980-04-30 Elpag Ag Chur Rohrheizkörper
US4314401A (en) * 1979-01-29 1982-02-09 Isamu Saku Sheathed heating element and sealing of sheathed electric heating element
EP0157182A1 (de) * 1984-03-01 1985-10-09 Elpag Ag Chur Rohrheizkörper
DE4235727A1 (de) * 1992-10-23 1994-04-28 Licentia Gmbh Feuchtigkeitsdichter Abschluß für elektrische Mantelrohrheizkörper und Verfahren zu seiner Herstellung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2021908A (en) * 1978-05-11 1979-12-05 Irca Spa Sealing the terminations of metal sheathed resistances
EP0010275A1 (de) * 1978-10-13 1980-04-30 Elpag Ag Chur Rohrheizkörper
US4314401A (en) * 1979-01-29 1982-02-09 Isamu Saku Sheathed heating element and sealing of sheathed electric heating element
EP0157182A1 (de) * 1984-03-01 1985-10-09 Elpag Ag Chur Rohrheizkörper
DE4235727A1 (de) * 1992-10-23 1994-04-28 Licentia Gmbh Feuchtigkeitsdichter Abschluß für elektrische Mantelrohrheizkörper und Verfahren zu seiner Herstellung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1448023A1 (de) * 2003-02-13 2004-08-18 Ngk Spark Plug Co., Ltd. Verfahren zur Herstellung eines Patronenheizkörpers und Verfahren zur Herstellung einer Glühkerze
WO2008137101A1 (en) * 2007-05-04 2008-11-13 Xtreme Bolting Service, Inc. Compact, portable resistance heating device
US9062704B2 (en) 2007-05-04 2015-06-23 Xtreme Bolting Service, Inc. Compact, portable resistance heating device
US9289866B2 (en) 2007-05-04 2016-03-22 Xtreme Bolting Service, Inc. Compact, portable resistance heating device
WO2011036105A1 (de) * 2009-09-25 2011-03-31 E.G.O. Elektro-Gerätebau GmbH Rohrheizkörper und verfahren zur herstellung eines solchen rohrheizkörpers
EP2481259B1 (de) 2009-09-25 2015-07-01 E.G.O. ELEKTRO-GERÄTEBAU GmbH Rohrheizkörper und verfahren zur herstellung eines solchen rohrheizkörpers
DE112013002131B4 (de) 2012-04-20 2022-09-29 Sanden Holdings Corporation Heizapparat

Also Published As

Publication number Publication date
ITVE970005A1 (it) 1998-08-07
IT1294562B1 (it) 1999-04-12

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