EP0109843A1 - Sonde chauffante à résistance électrique - Google Patents

Sonde chauffante à résistance électrique Download PDF

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Publication number
EP0109843A1
EP0109843A1 EP83307064A EP83307064A EP0109843A1 EP 0109843 A1 EP0109843 A1 EP 0109843A1 EP 83307064 A EP83307064 A EP 83307064A EP 83307064 A EP83307064 A EP 83307064A EP 0109843 A1 EP0109843 A1 EP 0109843A1
Authority
EP
European Patent Office
Prior art keywords
tube
sleeve
heat treatment
over
resistance
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.)
Granted
Application number
EP83307064A
Other languages
German (de)
English (en)
Other versions
EP0109843B1 (fr
Inventor
Robert George Howell
Alan Fletcher
Malcolm Stevens
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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
Priority claimed from GB838321028A external-priority patent/GB8321028D0/en
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Publication of EP0109843A1 publication Critical patent/EP0109843A1/fr
Application granted granted Critical
Publication of EP0109843B1 publication Critical patent/EP0109843B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
    • 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
    • H05B3/44—Heating elements having the shape of rods or tubes non-flexible heating conductor arranged within rods or tubes of insulating material

Definitions

  • This invention relates to resistance heaters.
  • the invention relates to resistance heaters which have an important though not exclusive application to the heat treatment of metallic members which have undergone other operations which can affect metallurgical properties.
  • a metallic member is a sleeve employed to repair a breach in a tube/tube plate weld of a heat exchanger by being secured in the relevant tube in a position to bridge the breach.
  • the securing may be an explosive weld of one end of the sleeve to the bore of the tube plate, and a braze joint of the other end of the sleeve to the relevant tube. It is necessary to heat treat the sleeve after the making of the joints in order to restore the necessary properties to the braze-affected joints so as to ensure that design life can be expected.
  • the braze is effected at a temperature of the order of 1150 C for about four minutes and the braze bond is typically about 40mm in length. Heat treatment however is at a lower temperature of the order of 750°C but for a longer period, typically one hour. A longer portion than the braze needs to be treated however, typically 150mm.
  • the braze heating is performed in one preferred system by an induction probe inserted within the sleeve and accessed from the tube plate bore.
  • induction probe inserted within the sleeve and accessed from the tube plate bore.
  • Such probes pose problems of adequate cooling and are expensive. Employment of such probes for heat treatment with its lower temperature and longer period would be wasteful.
  • heat treatment of the braze-affected area of a metallic sleeve attached by brazing within and to a metallic tube is performed by a resistance heater inserted within the sleeve so as to register with the length of the sleeve over which it is desired to effect heat treatment.
  • the said heater is preferably a composite in generally tubular form and may include at least one thermocouple by means of which the temperature for heat treatment can be monitored so that control over temperature can be effected by variation of the electric current supplied to the heater.
  • the thickness of a part of a composite may be varied. A preferred way of doing this will be subsequently described.
  • the invention also includes resistance heaters constructed to provide a desired length and profile of heat treatment to be applied to a tubular metallic member.
  • a resistance heater 1 which is a composite of a number of parts which will now be described.
  • a cylindrical core member 2 of a high resistance Ni/Cr alloy such as KANTHAL or NICHROME (RTM) screw threaded at one end 3 and with a bush 4 also of KANTHAL or NICHROME welded to the other end at 5.
  • a ceramic (eg alumina) tube 6 which abuts the bush 4 at one end and is engaged at the other end by a nut 7 on the member 2.
  • a longitudinal slot 8 (see Figure 2) in the tube 6 for reception of a thermocouple 9 which is cemented in position.
  • there is another longitudinal slot disposed in diametrically opposed relationship to the slot 8, enabling another thermocouple to be installed to give a check on the correct operation of the first one.
  • a heater tube 10 of KANTHAL or NICHROME which has over a portion 16 thereof a spiral groove extending through the full thickness of the tube 10 and typically 1mm wide on a pitch of 5mm, the groove 11 after assembly with the core member 2 and ceramic tube 6 being filled with cement of high electrical resistance.
  • the profile of the tube 10, produced by machining with constant bore, is such that there is a part 16' of maximum diameter thickness situated at the outer end of grooved portion 16 and welded to bush 4, and there is also a cylindrical, ie non-grooved, portion 13 which is of maximum constant diameter thickness and which is carried in a metallic (eg stainless steel) tubular part 14 via a heat conducting sleeve 15 secured by cementing to both parts (see Figure 2).
  • the grooved portion 16 of the heated tube 10 projects from the part 14 and is only partially coverd by two diametrically opposed part-annular bimetallic strips or wings 17 welded to the main body of part 14 and which terminate short of the outer end of portion 16.
  • the grooved portion 16 of tube 10 diverges to maximum diameter thickness, corresponding with that of cylindrical portion 13, at a position 18 in register with the outer ends of the strips or wings 17. It tapers in both directions from this position, in one direction to terminate at its outer end and in the other direction to a step where the portion 14 begins.
  • thermocouple 9 leads to circuitry 20 for monitoring.
  • cemented groove 11 of the heater tube 10 functions to provide a spiral of resistance heater material so that the tube 10 functions as a resistance heating element, the resulting heating effect being profiled along the grooved length of portion 16 by virtue of the varying thickness thereof as aforesaid.
  • thermocouple 8 functions as the hot junction and is in good heat contact with the bimetallic strips or wings 17 since it is cemented in ceramic tube 6 which is in contact with heater tube 10 which is in contact with tubular part 14 via conducting sleeve 15 and the strips or wings 17 are welded to part 14.
  • the strips or wings 1.7 are caused, when heat is generated in tube 10, to move outwardly to make firm contact with the breach-bridging sleeve aforesaid, thereby enabling the temperature of that sleeve to be constantly monitored by the thermocouple 8 so that the amount of heat generated by the tube 10 can be adjusted by varying the electric current supplied thereto so as to ensure that optimum conditions for the required heat treatment are provided.
  • thermocouple hot junction The association of a bimetallic strip carried by a heater with a thermocouple hot junction, the bimetallic strip being caused, on heating, to move into contact with the wall of a tube into which the heater is inserted, is the subject of our copending application No 82 33335, filed 23 November 1982. That application discloses that the heater has two bimetallic strips at diametrically opposed positions so that temperature are measured across a diameter of the tube, this being capable of being used to check uniformity of temperature or provide a check of correct operating of the hot junctions, a large difference of temperature measurement indicating either a faulty hot junction or a poor contact. Furthermore, it is disclosed that the bi-metals can be fitted into slots cut into the heater.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
EP83307064A 1982-11-23 1983-11-18 Sonde chauffante à résistance électrique Expired EP0109843B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB8233335 1982-11-23
GB8233335 1982-11-23
GB8321028 1983-08-04
GB838321028A GB8321028D0 (en) 1983-08-04 1983-08-04 Resistance heaters

Publications (2)

Publication Number Publication Date
EP0109843A1 true EP0109843A1 (fr) 1984-05-30
EP0109843B1 EP0109843B1 (fr) 1987-08-26

Family

ID=26284471

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83307064A Expired EP0109843B1 (fr) 1982-11-23 1983-11-18 Sonde chauffante à résistance électrique

Country Status (2)

Country Link
EP (1) EP0109843B1 (fr)
DE (2) DE3373255D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2612941A1 (fr) * 1987-03-25 1988-09-30 Framatome Sa Dispositif de chauffage en particulier pour le traitement thermique d'un tube de petit diametre et de forme courbe et utilisation de ce dispositif
CN103716928A (zh) * 2013-12-31 2014-04-09 宁波兴慈热动电器有限公司 一种电子调温器用电子加热器
CN105007641A (zh) * 2015-07-29 2015-10-28 中科华核电技术研究院有限公司 临界热流密度试验用加热棒
CN105517210A (zh) * 2015-12-25 2016-04-20 河源市信大石英电器有限公司 一种垂直使用的发热管

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1553342A (en) * 1923-05-19 1925-09-15 Westinghouse Electric & Mfg Co Heating element
DE1015159B (de) * 1956-05-17 1957-09-05 Siemens Ag Induktor zum Erwaermen von gekruemmten Oberflaechen, insbesondere der Innenwandungenvon Bohrungen od. dgl.
DE1101638B (de) * 1959-11-26 1961-03-09 Continental Elektro Ind Ag Rohrheizkoerper
FR1404105A (fr) * 1963-08-14 1965-06-25 Acec Procédé de soudage longitudinal de tubes et inducteur pour sa réalisation
GB2021369A (en) * 1978-05-13 1979-11-28 Stegmeier H A heating cartridge

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1553342A (en) * 1923-05-19 1925-09-15 Westinghouse Electric & Mfg Co Heating element
DE1015159B (de) * 1956-05-17 1957-09-05 Siemens Ag Induktor zum Erwaermen von gekruemmten Oberflaechen, insbesondere der Innenwandungenvon Bohrungen od. dgl.
DE1101638B (de) * 1959-11-26 1961-03-09 Continental Elektro Ind Ag Rohrheizkoerper
FR1404105A (fr) * 1963-08-14 1965-06-25 Acec Procédé de soudage longitudinal de tubes et inducteur pour sa réalisation
GB2021369A (en) * 1978-05-13 1979-11-28 Stegmeier H A heating cartridge

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2612941A1 (fr) * 1987-03-25 1988-09-30 Framatome Sa Dispositif de chauffage en particulier pour le traitement thermique d'un tube de petit diametre et de forme courbe et utilisation de ce dispositif
EP0285464A1 (fr) * 1987-03-25 1988-10-05 Framatome Dispositif de chauffage en particulier pour le traitement thermique d'un tube de petit diamètre et de forme courbe et utilisation de ce dispositif
CN103716928A (zh) * 2013-12-31 2014-04-09 宁波兴慈热动电器有限公司 一种电子调温器用电子加热器
CN105007641A (zh) * 2015-07-29 2015-10-28 中科华核电技术研究院有限公司 临界热流密度试验用加热棒
CN105517210A (zh) * 2015-12-25 2016-04-20 河源市信大石英电器有限公司 一种垂直使用的发热管

Also Published As

Publication number Publication date
DE109843T1 (de) 1984-10-11
EP0109843B1 (fr) 1987-08-26
DE3373255D1 (en) 1987-10-01

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