EP0419351A1 - Elektrisches Rohrheizelement und seine Biegevorrichtung, und Austauscher mit einem solchen Element - Google Patents

Elektrisches Rohrheizelement und seine Biegevorrichtung, und Austauscher mit einem solchen Element Download PDF

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Publication number
EP0419351A1
EP0419351A1 EP90402584A EP90402584A EP0419351A1 EP 0419351 A1 EP0419351 A1 EP 0419351A1 EP 90402584 A EP90402584 A EP 90402584A EP 90402584 A EP90402584 A EP 90402584A EP 0419351 A1 EP0419351 A1 EP 0419351A1
Authority
EP
European Patent Office
Prior art keywords
heating element
exchanger
sheath
outer sheath
jaws
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.)
Ceased
Application number
EP90402584A
Other languages
English (en)
French (fr)
Inventor
Sylvain Lalot
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.)
Vulcanic
Original Assignee
Vulcanic
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 Vulcanic filed Critical Vulcanic
Publication of EP0419351A1 publication Critical patent/EP0419351A1/de
Ceased 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

Definitions

  • the present invention relates to a tubular electric heating element in particular for corrosive baths, of the type comprising a metal tube inside which the heating members are arranged, as well as a bending device for this element and a heat exchanger comprising a such element.
  • Known electric heating elements generally have a metallic outer sheath. This makes them very vulnerable in most corrosive baths and their lifespan is therefore very short under these conditions of use.
  • the present invention aims to overcome these drawbacks.
  • the invention firstly relates to a tubular electric heating element, in particular for corrosive baths, comprising a metal tube inside which the heating members are arranged, characterized in that it comprises a corrugated outer sheath made of corrosion-resistant synthetic material.
  • PTFE polytetrafluoroethylene
  • Such a corrugated sheath has a number of advantages.
  • the exchange surface is increased at the level of the sheath making it possible to pass a greater heat flow with equal thickness.
  • this small sheath has a thickness of the order of 0.5 mm to 1 mm and be therefore much less fragile.
  • the seal can be checked before assembly.
  • the corrugations allow, on the other hand, either a very easy mounting on curved parts, or a bending after mounting.
  • the corrugations absorb the differences in expansion between the sheath and the heating tube.
  • the element according to the invention comprises an end plug made of a resin of the same kind as the sheath.
  • thermocouple is provided disposed between the metal tube and the outer sheath.
  • thermocouple makes it possible to know the temperature of the sheath so as to regulate the temperature of the heating element or its power.
  • the temperature of the sheath is lower than its degradation temperature. It is also useful that the temperature of the sheath is limited in the event that the fluid to be heated can degrade.
  • the present invention also relates to a device for bending an element as described above, characterized in that it comprises fixed jaws for immobilizing the element in translation, a fixed wheel adjacent to said jaws, and a wheel movable in rotation about the axis of the fixed wheel, the jaws and the wheels having surfaces having a profile complementary to that of the outer sheath of the element.
  • the present invention also relates to a heat exchanger, characterized in that it comprises at least one heating element as described above.
  • this exchanger comprises at least one sealing gland between the heating element and the wall of the exchanger.
  • connection box provided with a cup-shaped flange, said flange having at least one hole for the passage of the end of the heating element, said end being embedded in a sealing and holding resin contained in said flange.
  • the heating element shown in FIG. 1 comprises in a known manner a heating wire 1 made of a resistive alloy of the nickel-chromium type and two electrical connection terminals 2.
  • the wire 1 is placed in a tube 3 from which it is isolated by an insulating powder 4, for example magnesia.
  • the tube 3 is made of a very malleable material such as copper or aluminum which has undergone thermal softening after the compacting of the insulation 4, carried out by rolling.
  • the tube 1 is then threaded into an outer sheath 5 of corrugated shape.
  • This operation can be performed before the formation of the loops 6 or after, depending on the length and the number of loops.
  • the seal at the end of the heating element between the tube 1 and the terminals 2 on the one hand, and between the sheath 5 and the tube 1 on the other hand, is obtained using a plug 7 in suitable resin.
  • this resin is of the same nature as the sheath 5.
  • the sheath can be made of fluorinated resin such as PTFE, the plug 7 also being made of a fluorinated resin, for example melted at 360 ° C.
  • thermocouple 8 disposed between the tube 3 and the sheath 5 in order to know the temperature of the latter.
  • the sealing at the supply wires 9 is also carried out using the resin plug 7, these wires being brought to the instrumentation outside the heating element.
  • Figure 3 shows a device for bending a heating element 10 according to the invention.
  • This device comprises two fixed jaws 11 for keeping this element in translation and a thumb wheel 12 also fixed relative to the jaw 11.
  • Another wheel 13 is pivotally mounted around the axis 14 of the wheel 12 to move as shown by the arrow F.
  • the contact surfaces of the jaws 11 and the knurling wheels 12 and 13 with the element 10 have imprints complementary to the undulation of the sheath to allow the bending of the element 10 without damaging the corrugated sheath.
  • the bending is obtained by tightening this element in the jaws 11 then by moving the wheel 13 in the direction of the arrow F in order to bend the element around the wheel 12.
  • the wall of the exchanger 16 comprises for example a metal casing 17 and an inner coating 18 of the same kind as the outer sheath of the heating element 15.
  • the ends of the element 15 pass through the wall of the exchanger 16, l sealing vis-à-vis the outside being ensured by means of the devices 19 shown in detail in FIG. 5.
  • the end 20 of the sheath is made cylindrical by heating and forming adapted to its nature. In the case of a PTFE sheath, it is heated to 360 ° C. using a heating mandrel to remove the ripples.
  • the seal is produced using a cable gland, the body 21 of which is held by a nut 22 which makes it possible to ensure the seal between the inner lining 18 and the body 21.
  • the body 21 and the seal 23 must of course resist corrosion of the fluid inside the exchanger and its temperature.
  • these parts can be made of PTFE.
  • a cup-shaped flange 25 made for example of aluminum has two holes 26 for the passage of the ends of the heating element 15. These ends are embedded in a resin 27 inside of the flange 25, only the connection terminals 28 protruding from the resin 27 to allow their connection at 29.
  • the resin 27 provides mechanical support for the tube and the sheath of the element 15 relative to the connector, as well as the seals between the terminals 28 and the tube, between the tube and the sheath, and between the sheath and the flange 25 .

Landscapes

  • Resistance Heating (AREA)
  • Control Of Resistance Heating (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
EP90402584A 1989-09-19 1990-09-19 Elektrisches Rohrheizelement und seine Biegevorrichtung, und Austauscher mit einem solchen Element Ceased EP0419351A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912265A FR2652225B1 (fr) 1989-09-19 1989-09-19 Element tubulaire de chauffage electrique et son dispositif de cintrage, et echangeur comportant un tel element.
FR8912265 1989-09-19

Publications (1)

Publication Number Publication Date
EP0419351A1 true EP0419351A1 (de) 1991-03-27

Family

ID=9385629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90402584A Ceased EP0419351A1 (de) 1989-09-19 1990-09-19 Elektrisches Rohrheizelement und seine Biegevorrichtung, und Austauscher mit einem solchen Element

Country Status (3)

Country Link
EP (1) EP0419351A1 (de)
DE (1) DE419351T1 (de)
FR (1) FR2652225B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2718596A1 (fr) * 1994-04-07 1995-10-13 Hotset Heizpatronen Zubehoer Corps de chauffe électrique pour moules à injection.
EP0934493A4 (de) * 1996-10-11 2002-09-11 Tom Richards Inc Entlüfteter, geerdeter tauchheizer
WO2014006410A3 (en) * 2012-07-05 2014-06-05 Pentair Thermal Management, Llc Mineral insulated cable having reduced sheath temperature

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1524847A (fr) * 1966-07-02 1968-05-10 Kabel Metallwerke Ghh Conducteur chauffant
FR2167674A1 (de) * 1972-01-12 1973-08-24 Elpag Ag Chur
FR2230142A1 (en) * 1973-05-17 1974-12-13 Raquin Pierre Flexible heating element for liquids in laboratories - has resistance wire in corrugated tube with end connections
FR2238414A7 (en) * 1973-07-18 1975-02-14 Resistenze Elettriche Corazzat Elastic seal for leads to electrical heating element - to prevent damp short circuit of e.g. defrosting heaters
DE2626075A1 (de) * 1976-06-10 1977-12-22 Siemens Ag Biegeverfahren fuer elektrische rohrheizkoerper und nach dem biegeverfahren hergestellter elektrischer rohrheizkoerper
FR2376906A1 (fr) * 1977-01-08 1978-08-04 Bosch Siemens Hausgeraete Procede pour eviter la corrosion de pieces en acier
FR2496382A1 (fr) * 1980-12-13 1982-06-18 Fudickar Kg C S Dispositif de chauffage electrique, notamment pour elements chauffants, appareils menagers ou plateaux de presses, et procede de fabrication
DE3722878A1 (de) * 1987-07-10 1989-01-19 Leo Roeckert Heizstab
FR2623357A1 (fr) * 1987-11-12 1989-05-19 Ego France Thermoplongeur a double paroi

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1524847A (fr) * 1966-07-02 1968-05-10 Kabel Metallwerke Ghh Conducteur chauffant
FR2167674A1 (de) * 1972-01-12 1973-08-24 Elpag Ag Chur
FR2230142A1 (en) * 1973-05-17 1974-12-13 Raquin Pierre Flexible heating element for liquids in laboratories - has resistance wire in corrugated tube with end connections
FR2238414A7 (en) * 1973-07-18 1975-02-14 Resistenze Elettriche Corazzat Elastic seal for leads to electrical heating element - to prevent damp short circuit of e.g. defrosting heaters
DE2626075A1 (de) * 1976-06-10 1977-12-22 Siemens Ag Biegeverfahren fuer elektrische rohrheizkoerper und nach dem biegeverfahren hergestellter elektrischer rohrheizkoerper
FR2376906A1 (fr) * 1977-01-08 1978-08-04 Bosch Siemens Hausgeraete Procede pour eviter la corrosion de pieces en acier
FR2496382A1 (fr) * 1980-12-13 1982-06-18 Fudickar Kg C S Dispositif de chauffage electrique, notamment pour elements chauffants, appareils menagers ou plateaux de presses, et procede de fabrication
DE3722878A1 (de) * 1987-07-10 1989-01-19 Leo Roeckert Heizstab
FR2623357A1 (fr) * 1987-11-12 1989-05-19 Ego France Thermoplongeur a double paroi

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2718596A1 (fr) * 1994-04-07 1995-10-13 Hotset Heizpatronen Zubehoer Corps de chauffe électrique pour moules à injection.
EP0934493A4 (de) * 1996-10-11 2002-09-11 Tom Richards Inc Entlüfteter, geerdeter tauchheizer
WO2014006410A3 (en) * 2012-07-05 2014-06-05 Pentair Thermal Management, Llc Mineral insulated cable having reduced sheath temperature
US10076001B2 (en) * 2012-07-05 2018-09-11 Nvent Services Gmbh Mineral insulated cable having reduced sheath temperature
US11224099B2 (en) * 2012-07-05 2022-01-11 Nvent Services Gmbh Mineral insulated cable having reduced sheath temperature

Also Published As

Publication number Publication date
FR2652225A1 (fr) 1991-03-22
DE419351T1 (de) 1991-09-26
FR2652225B1 (fr) 1991-11-08

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