EP1247429B2 - Element chauffant avec integration d'un dispositif de securite thermique - Google Patents

Element chauffant avec integration d'un dispositif de securite thermique Download PDF

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Publication number
EP1247429B2
EP1247429B2 EP01903905A EP01903905A EP1247429B2 EP 1247429 B2 EP1247429 B2 EP 1247429B2 EP 01903905 A EP01903905 A EP 01903905A EP 01903905 A EP01903905 A EP 01903905A EP 1247429 B2 EP1247429 B2 EP 1247429B2
Authority
EP
European Patent Office
Prior art keywords
heating element
fuse
thermal
heater device
electrical heater
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
EP01903905A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1247429A1 (fr
EP1247429B1 (fr
Inventor
Pascal Hantz
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.)
SEB SA
Original Assignee
SEB SA
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
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Application filed by SEB SA filed Critical SEB SA
Publication of EP1247429A1 publication Critical patent/EP1247429A1/fr
Application granted granted Critical
Publication of EP1247429B1 publication Critical patent/EP1247429B1/fr
Publication of EP1247429B2 publication Critical patent/EP1247429B2/fr
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
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0202—Switches
    • H05B1/0205—Switches using a fusible material
    • 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 shielded element type electric heating element and more particularly the integration of a thermal safety device to this element.
  • This protection element therefore corresponds to a fuse placed in series with the heating element in the tubular casing, requiring an intermediate connection. Furthermore, the confinement of the fuse within the heating element is a source of a possible re-ionization of the gas around the fuse when the latter is vaporized by overheating of the device, which can lead, within the insulating material, to close the electrical supply circuit that has just been opened. This possibility of malfunction of the safety device should be avoided as much as possible because its consequences can be serious.
  • a heating element 70 comprises a spiral resistor 72 contained in a first tube 71 in an insulating powder 73.
  • the spiral resistance 72 is held by two connecting pins 78a and 78b through two stopper beads 74a and 74b arranged in the ends of this first tube 71.
  • a thermal protection fuse 77 is housed between the bead 74b and a third end bead 76b arranged on a second tube 75 containing the first tube. This fuse is connected to the pin 78b and to a pin 78c connected to the power supply circuit.
  • a fourth bead 76a through which the pin 78a passes, closes the second tube.
  • the fuse is certainly not housed within the heating element, but it remains nonetheless confined between two capping beads, which does not completely eliminate the risk of re-ionization of the surrounding gas after triggering, the bead 76b constituting in particular a thermal brake.
  • the insertion of the fuse requires a specific connection. Overall, four beads and two tubes are thus necessary to obtain a heating element having a thermal fuse at one of its ends, which significantly increases the cost of the assembly.
  • the document DE 4243894 A1 discloses an electric heater consisting of a tubular casing, inside which is housed a heating element surrounded by an insulator, said heating element being connected to an electrical supply circuit by rods and connection pins said tubular casing comprising, at one end, a thermal fuse housed in a volume separate from that where the heating element is placed. The fuse is however confined in a closed volume by two capping beads.
  • the object of the present invention is to overcome the disadvantages of the prior art by providing an electric heating device consisting of a tubular envelope, inside which is housed a heating element surrounded by insulation, said heating element being connected to a power supply circuit by connection rods and pins, said tubular casing being provided with two cylindrical closure beads arranged at its ends, at least one of said beads, said specific bead, being in direct contact with the insulation surrounding the heating element, the specific bead having a recess therethrough axially, wherein is inserted a thermal fuse electrically connected in series with the heating element.
  • the recess comprises a narrowing at the end in connection with the inside of the tube, against which is positioned the fuse.
  • the heating element is spiral and mounted in tension in the tubular casing.
  • This configuration allows in particular corking beads, linked to the ends of the heating element, to be held by bearing on the ends of the tubular casing without specific piece.
  • the shrinkage formed in the recess makes it possible to position the fuse correctly and systematically in the recess, without any particular mechanical part. This also ensures the closure of the tube vis-à-vis the insulation surrounding the heating element.
  • the thermal fuse comprises a housing inside which is housed a compression spring exerting a pressure between, on the one hand, a thermal pellet situated at the outer end of the casing and in contact with an external connecting pin and, on the other hand, a first central sliding disc pushed in abutment against an internal connecting rod, and this against a restoring force exerted by an opening spring coaxial with the connecting rod.
  • the connecting rod is surrounded, within the thermal fuse, an isolator, also for centering and / or maintain the connection rod away from the fuse box.
  • the thermal pad is located at the end of the fuse box located outside the tubular casing.
  • the direct contact between the pellet and one of the external connection pins avoids the re-ionization of the gas produced during the melting of the pellet, in particular by allowing the rapid flow of the calories generated.
  • a heating device 1 is presented figure 2 in the form of what is commonly called armored resistance.
  • This device comprises a tubular envelope 2 inside which is housed a spiral heating element 4 surrounded by insulation 3, such as magnesia. Clogging beads of this insulator are arranged at each end of the tubular casing 2. At least one of these pearls, referred to as the specific pearl as will be detailed below, is in direct contact with the surrounding insulation 3. the spiral heating element 4, as it is perfectly visible figure 2 .
  • the two capping beads are in direct contact with said insulator.
  • the ends 6 of the heating element 4 are arranged, for example by welding, each around a cylindrical connection or a lug 8 serving to connect the heating element to the external power supply circuit.
  • This cylindrical connection is thus extended by an electric connecting rod 10.
  • the electrical connecting rod 10 passes through one of the capping beads in order to establish the electrical contact with the external supply circuit.
  • the second sealing bead, said specific bead 16 is cylindrical and has a recess 18 passing axially therethrough.
  • This recess is intended to receive a thermal fuse 20.
  • the fuse will be mounted in the recess with the minimum clearance.
  • the recess comprises a narrowed zone in its inner part, ie located on the side of the heating element, in the form for example of a cone 21.
  • This cone cooperates with the thermal fuse 20 also having a tapered portion 22 to prevent the latter from sliding towards the heating element.
  • the spiral heating element is mounted in tension in the tubular casing, so that the fuse undergoes a tensile force which tends to hold it against the conical portion 22 of the recess, ensuring both a plugging of the heating element, but also the maintenance of the fuse, and jointly the maintenance of the bead 16 on the tubular casing.
  • the thermal fuse 20 is connected in series with the heating element 4 via the connection rod 10. It is connected to the external power supply circuit via a pin 12 carrying a connector 14. This fuse thus makes the connection between the external electrical circuit and the inside of the tubular casing.
  • the fuse 20 may be housed either partially inside said casing, or wholly inside or totally outside said casing, depending on the thermal reaction characteristics desired for the casing. protection device.
  • This fuse makes it possible to cut the power supply of the heating element in the event of non-operation of the regulating element of the apparatus, causing overheating of the resistance.
  • the calibration of the fuse, as well as its position in the tubular casing 2 are adapted to the temperature obtained at the bead during overheating, lower temperature than in the heating element.
  • the thermal fuse 20 is detailed at Figures 3a and 3b which illustrate its state respectively before and after tripping, that is to say respectively in running state of operation and in state of cutoff.
  • the thermal fuse 20 comprises a housing 23 inside which is housed a thermal pellet 24 having the particularity of vaporizing when it is subjected to a given temperature, corresponding, in our case, to an overheating of the heating element .
  • This pellet is arranged at the outer end, that is to say the furthest from the heating element, so as not to have too much reactivity that could cause it to vaporize while the heating element n ' is not in a state of overheating.
  • the fuse comprises a first compression spring 28 mounted between two disks 26. One of these disks is in contact with the pellet 24, while the other provides the connection between this first spring 28 and a third disk 30 arranged against the restoring force of a second spring 32.
  • the disk 30 is in contact with the connecting rod 10 immobilized in the housing 23 by an insulator 34, particular help of recesses 38 on the connecting rod.
  • the spring 28 forces the inner disk 26 and the contact disk 30 against the end of the connecting rod 10 ensuring, by the thermal pad, the continuity of the power supply circuit.
  • the disc 30 is in the form of a star contact to ensure good electrical contact.
  • Other forms are also possible without departing from the scope of the present invention.
  • the housing 23 has an opening 40 at the end where is housed the thermal pad, at the connection with the pin 12, allowing a direct contact between the pad 24 and the pin 12.
  • the housing is put in the open air by the cavity 18.
  • the thermal pellet volatilizes
  • the calories generated can mainly and rapidly dissipate, both by exchange with the ambient air, through the cavity 18, but also by conduction in the pin 12.
  • the risks of ionization are then very low, which gives great reliability to the device.
  • volatilization of the pellet causes the relaxation of the two springs 28 and 32 resulting in a mechanical equilibrium where in particular the disc 30 is no longer in contact with the connecting rod 10.
  • the electrical supply circuit of the heating element is then interrupted.
  • the use of a conventional thermal fuse to replace the usual connection terminal of the heating element, by integrating the thermal protection into the resistor also allows a direct temperature measurement by removing a diffuser, while making the inertia Thermal faster and more reliable.
  • the heating element is thus self-regulated.
  • the fuse is positioned in a single operation during the fixing of the sealing bead. It is therefore no longer a patch that requires additional steps for its integration into the heater. Assembly time and costs are reduced.

Landscapes

  • Fuses (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
  • Electric Stoves And Ranges (AREA)
EP01903905A 2000-01-13 2001-01-10 Element chauffant avec integration d'un dispositif de securite thermique Expired - Lifetime EP1247429B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0000415A FR2803976B1 (fr) 2000-01-13 2000-01-13 Element chauffant avec integration d'un dispositif de securite thermique
FR0000415 2000-01-13
PCT/FR2001/000065 WO2001052601A1 (fr) 2000-01-13 2001-01-10 Element chauffant avec integration d'un dispositif de securite thermique

Publications (3)

Publication Number Publication Date
EP1247429A1 EP1247429A1 (fr) 2002-10-09
EP1247429B1 EP1247429B1 (fr) 2003-05-07
EP1247429B2 true EP1247429B2 (fr) 2009-07-08

Family

ID=8845886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01903905A Expired - Lifetime EP1247429B2 (fr) 2000-01-13 2001-01-10 Element chauffant avec integration d'un dispositif de securite thermique

Country Status (9)

Country Link
US (1) US6710310B2 (pt)
EP (1) EP1247429B2 (pt)
AT (1) ATE240027T1 (pt)
AU (1) AU3186601A (pt)
DE (1) DE60100257T3 (pt)
ES (1) ES2198395T5 (pt)
FR (1) FR2803976B1 (pt)
PT (1) PT1247429E (pt)
WO (1) WO2001052601A1 (pt)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE50110692D1 (de) * 2001-01-24 2006-09-21 Leister Process Tech Heisslufteinrichtung
JP2003317589A (ja) * 2002-04-24 2003-11-07 Nec Schott Components Corp 感温ペレット型温度ヒュ−ズ
US6887258B2 (en) * 2002-06-26 2005-05-03 Advanced Cardiovascular Systems, Inc. Embolic filtering devices for bifurcated vessels
JP4471203B2 (ja) * 2003-10-28 2010-06-02 エヌイーシー ショット コンポーネンツ株式会社 感温ペレット型温度ヒューズおよび感温ペレットの製造方法
JP4375738B2 (ja) 2004-09-17 2009-12-02 エヌイーシー ショット コンポーネンツ株式会社 感温ぺレット型温度ヒューズ
JP4521725B2 (ja) * 2005-03-17 2010-08-11 エヌイーシー ショット コンポーネンツ株式会社 感温ペレット型温度ヒューズ
JP4583228B2 (ja) * 2005-04-18 2010-11-17 エヌイーシー ショット コンポーネンツ株式会社 感温ペレット型温度ヒューズ
US7843307B2 (en) * 2007-10-05 2010-11-30 Nec Schott Components Corporation Thermal fuse employing thermosensitive pellet
ITVE20080012U1 (it) * 2008-04-24 2009-10-24 D H E S R L Scambiatore di calore per fluidi.
IT1391845B1 (it) * 2008-11-03 2012-01-27 Irca Spa Scambiatore di calore con protezione termica
CH711968A1 (de) 2015-12-28 2017-06-30 C3 Casting Competence Center Gmbh Durchlauferhitzer.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2514584A1 (de) † 1975-04-03 1976-12-02 Bahlmann Kg G Elektrisches tauchheizgeraet
US4001754A (en) † 1974-05-21 1977-01-04 Emerson Electric Co. Temperature responsive electrical switch construction and method of making the same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4384267A (en) * 1980-07-07 1983-05-17 Murata Manufacturing Co., Ltd. Thermosensitive fuse
US4390776A (en) * 1982-03-01 1983-06-28 Yane Daryl J Immersion heater
DE3433688A1 (de) 1984-09-13 1986-03-20 Siemens AG, 1000 Berlin und 8000 München Rohrheizkoerper mit temperatursicherung
FR2579854A1 (fr) * 1985-03-29 1986-10-03 Etirex Resistance electrique blindee a enroulements coaxiaux
DE8715851U1 (de) 1987-11-30 1988-02-18 Elpag Ag Chur, Chur Rohrheizkörper mit einer Überlastungssicherung
DE4243894A1 (en) * 1991-12-24 1993-07-15 Eltra Gmbh & Co Kg Leicht & Tr Tubular heater with a thermal cut=out - has temp. dependent circuit breaker in tube screwed onto heating coil terminal in heater jacket.
JPH06267641A (ja) 1993-03-10 1994-09-22 Kawai Denki Seisakusho:Kk 曲げ加工が施された温度ヒューズ付きシーズヒータ及びその製造方法
IT1262417B (it) * 1993-10-29 1996-06-19 Merloni Termosanitari Spa Sistema di autoprotezione per elemento riscaldante di tipo elettrico, in particolare elemento riscaldante per lavabiancheria, scaldabagni e simili.
US6392208B1 (en) * 1999-08-06 2002-05-21 Watlow Polymer Technologies Electrofusing of thermoplastic heating elements and elements made thereby

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4001754A (en) † 1974-05-21 1977-01-04 Emerson Electric Co. Temperature responsive electrical switch construction and method of making the same
DE2514584A1 (de) † 1975-04-03 1976-12-02 Bahlmann Kg G Elektrisches tauchheizgeraet

Also Published As

Publication number Publication date
US20030010772A1 (en) 2003-01-16
AU3186601A (en) 2001-07-24
FR2803976B1 (fr) 2002-05-17
ES2198395T3 (es) 2004-02-01
US6710310B2 (en) 2004-03-23
PT1247429E (pt) 2003-09-30
DE60100257D1 (de) 2003-06-12
WO2001052601A1 (fr) 2001-07-19
DE60100257T2 (de) 2004-04-01
ES2198395T5 (es) 2009-11-27
EP1247429A1 (fr) 2002-10-09
ATE240027T1 (de) 2003-05-15
FR2803976A1 (fr) 2001-07-20
DE60100257T3 (de) 2010-01-14
EP1247429B1 (fr) 2003-05-07

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