EP1247429B1 - Heizelement mit thermischer sicherheitsvorrichtung - Google Patents

Heizelement mit thermischer sicherheitsvorrichtung Download PDF

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Publication number
EP1247429B1
EP1247429B1 EP01903905A EP01903905A EP1247429B1 EP 1247429 B1 EP1247429 B1 EP 1247429B1 EP 01903905 A EP01903905 A EP 01903905A EP 01903905 A EP01903905 A EP 01903905A EP 1247429 B1 EP1247429 B1 EP 1247429B1
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
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English (en)
French (fr)
Other versions
EP1247429A1 (de
EP1247429B2 (de
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
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Filing date
Publication date
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Application filed by SEB SA filed Critical SEB SA
Publication of EP1247429A1 publication Critical patent/EP1247429A1/de
Publication of EP1247429B1 publication Critical patent/EP1247429B1/de
Application granted granted Critical
Publication of EP1247429B2 publication Critical patent/EP1247429B2/de
Anticipated expiration legal-status Critical
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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 an electric heating element of the type armored element and more particularly the integration of a security device thermal to this element.
  • This protective element therefore corresponds to a fuse placed in series with the heating element in the tubular casing, requiring connection intermediate. Furthermore, the confinement of the fuse within the element heater is a source of possible re-ionization of the gas around the fuse when the latter is vaporized by overheating of the device, which can lead to within the insulating material, to close the electrical supply circuit from to be open. This possibility of malfunction of the safety device must be avoided as much as possible as its consequences can be serious.
  • a heating element 70 comprises a spiral resistance 72 contained in a first tube 71 within an insulating powder 73.
  • the spiral resistance 72 is held by two connection pins 78a and 78b through two closure beads 74a and 74b arranged in the ends of this first tube 71.
  • a thermal protection fuse 77 is housed between the pearl 74b and a third end bead 76b arranged on a second tube 75 containing the first tube. This fuse is connected to pin 78b as well as to pin 78c connected to the electrical supply circuit.
  • a fourth pearl 76a, crossed by pin 78a ensures the plugging of the second tube.
  • the fuse is certainly not housed within the heating element, but it remains confined between two cork beads, which does not does not completely eliminate the risks of re-ionization of the surrounding gas after tripping, the pearl 76b constituting in particular a thermal brake. Moreover, inserting the fuse requires a specific connection. Overall, four beads and two tubes are thus necessary to obtain an element heater with a thermal fuse at one end, which significantly increases the cost price of the whole.
  • the document DE 4243894 A1 describes an electric heating device consisting of a tubular casing, inside which is housed a heating element surrounded by a 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 separate volume from that where the heating element is placed. The the fuse is however confined in a volume closed by two plug beads.
  • the object of the present invention is to remedy the drawbacks of the art by presenting an electric heating device consisting of a tubular casing, inside which is housed a heating element surrounded by insulation, said heating element being connected to a supply circuit electric by connecting rods and pins, said tubular casing being provided with two cylindrical stopper beads arranged at its ends, at the minus one of these pearls, called a specific pearl, being in direct contact with the insulation surrounding the heating element, characterized in that the specific bead has a recess running axially through it, into which is inserted a thermal fuse electrically mounted in series with the heating element.
  • the heating element is in a spiral and mounted in tension in the tubular casing.
  • This configuration allows in particular the stopper beads, linked to ends of the heating element, to be maintained by resting on the ends of the tubular casing without any specific part.
  • the recess comprises a narrowing at the level of the end in connection with the inside of the tube, against which the fuse.
  • the narrowing made in the recess allows correct positioning and systematically the fuse in the recess, without any particular mechanical part. This also makes it possible to ensure the plugging of the tube with respect to the insulation. surrounding the heating element.
  • the thermal fuse has a housing inside which is housed a compression spring exerting a pressure between, on the one hand a thermal patch located at the end external of the housing and in contact with an external connection pin and other share a first central sliding disc pushed into abutment against a rod internal connection, and this against a restoring force exerted by a spring opening coaxial to the connecting rod.
  • the connecting rod is surrounded, within the thermal fuse, an isolator, also allowing to center and / or maintain the rod remote connection of the fuse box.
  • the thermal patch is located at the end of the housing of the fuse located outside the tubular casing.
  • connection pins Furthermore, direct contact between the patch and one of the connection pins external prevents 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 in FIG. 2 in the form of what is commonly called an armored resistor.
  • This device includes a tubular casing 2 inside which is housed a heating element spiral 4 surrounded by insulation 3, like magnesia. Stopper beads of this insulation are arranged at each end of the tubular casing 2. At least one of these pearls, called a specific pearl as will be detailed below, is in direct contact with the insulation 3 surrounding the spiral heating element 4, as it is perfectly visible in figure 2. Preferably, the two stopper 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 terminal 8 used to connect the heating element to the external electrical supply circuit.
  • This cylindrical connection is thus extended by an electrical connecting rod 10.
  • the second stopper bead is cylindrical and has a recess 18 passing through it axially.
  • This recess is intended to receive a thermal fuse 20.
  • the fuse will be mounted in the recess with the minimum of Game.
  • the recess has a narrowed zone in its internal part, this is to say 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 conical part 22 to prevent the latter from sliding towards the element heating.
  • the spiral heating element is mounted in tension in the envelope tubular, so that the fuse undergoes a tensile force which tends to hold it against the conical part 22 of the recess, ensuring, at the same time a plugging of the heating element, but also the maintenance of the fuse, and jointly the holding the pearl 16 on the tubular casing.
  • the thermal fuse 20 is mounted in series with the heating element 4 by via the connecting rod 10. It is linked to the external supply circuit electric via a pin 12 carrying a connector 14. This fuse thus makes the link between the external electrical circuit and the interior of the tubular casing.
  • the fuse 20 can be housed either partially inside said envelope, either totally inside or completely outside of said envelope, according to the reaction characteristics desired thermal values for the protection device.
  • This fuse makes it possible to cut the electrical supply to the element heating in case of non-functioning of the regulating element of the device, causing the resistance to overheat.
  • the calibration of the fuse, as well as its position in the tubular casing 2 are adapted to the temperature obtained at the level of the pearl during overheating, lower temperature than within the heating element.
  • the thermal fuse 20 is detailed in FIGS. 3a and 3b which illustrate its state respectively before and after triggering, i.e. respectively in operating state and in cut-off state.
  • the thermal fuse 20 comprises a housing 23 inside which is housed a thermal tablet 24 having the particularity of vaporizing when subjected to a given, corresponding temperature in our case, overheating of the heating element.
  • This patch is arranged at the outer end, that is to say the furthest from the heating element, so as not to exhibit too great a reactivity which could cause it to vaporize while the heating element is not in a overheat state.
  • the fuse comprises a first compression spring 28 mounted between two discs 26. One of these discs is in contact with the pad 24, while the other ensures the connection between this first spring 28 and a third disc 30 arranged against the return force of a second spring 32.
  • the disc 30 is in contact with the connecting rod 10 immobilized in the housing 23 by an insulator 34, in particular using recesses 38 on the connecting rod.
  • the spring 28 constrains the internal disc 26 and the disc of contact 30 against the end of the connecting rod 10 ensuring, by the pad thermal continuity of the electrical supply circuit.
  • the disc 30 is in the form of a star contact so 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 the thermal pad, at the connection with pin 12, allowing a direct contact between the pad 24 and the pin 12.
  • the box is vented through the cavity 18.
  • the thermal tablet volatilizes
  • the calories generated can mainly and quickly dissipate, both by exchange with the ambient air, thanks to the cavity 18, but also by conduction in the spindle 12.
  • the risks of ionization are then very low, which provides high reliability to 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 element heating is then interrupted.
  • the use of a conventional thermal fuse to replace the terminal usual connection of the heating element, integrating the protection thermal resistance also allows direct temperature measurement by removing a diffuser, while making thermal inertia faster and More reliable.
  • the heating element is thus self-regulated.
  • the fuse is positioned in a single operation when fixing the stopper bead. It is therefore no longer a patch that requires additional steps for its integration within the heater. Assembly time and costs are thus reduced.

Landscapes

  • Fuses (AREA)
  • Control Of Resistance Heating (AREA)
  • Resistance Heating (AREA)
  • Electric Stoves And Ranges (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Claims (6)

  1. Elektrische Heizvorrichtung (1), die aus einer rohrförmigen Ummantelung (2) besteht, in deren Inneren ein Heizelement (4) aufgenommen ist, das von Isoliermaterial (3) umgeben ist, wobei das Heizelement (4) durch Bolzen und Stifte (10, 12) zum Anschließen (14) mit einem elektrischen Speisestromkreis verbunden ist, wobei die rohrförmige Ummantelung (2) mit zwei zylindrischen Dichtungsperlen verbunden ist, die an ihren Enden angeordnet sind, wobei sich wenigstens eine dieser Perlen, die sogenannte spezifische Perle (16), mit dem das Heizelement (4) umgebenden Isoliermaterial (3) in direktem Kontakt befindet, dadurch gekennzeichnet, daß die spezifische Perle (16) eine sie axial durchquerende Ausnehmung (18) aufweist, in die eine thermische Sicherung (20) eingeführt ist, die mit dem Heizelement (4) elektrisch in Reihe geschaltet ist.
  2. Elektrische Heizvorrichtung (1) nach Anspruch 1, dadurch gekennzeichnet, daß das Heizelement (4) spiralförmig und unter Spannung in der rohrförmigen Ummantelung (2) angebracht ist.
  3. Elektrische Heizvorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Ausnehmung (18) auf Höhe des mit dem Inneren des Rohrs in Verbindung stehenden Endes eine Verengung (21) aufweist, gegen die die Sicherung (20) positioniert ist.
  4. Elektrische Heizvorrichtung (1) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die thermische Sicherung (20) ein Gehäuse (23) aufweist, in dessen Innerem eine Kompressionsfeder (28) aufgenommen ist, die einerseits zwischen einer thermischen Pille (24), die am äußeren Ende des Gehäuses liegt und mit einem äußeren Anschlußstift (12) in Kontakt steht, und andererseits einer Scheibe (26) einen Druck ausübt, die zentral gleitend in Anlage gegen einen internen Verbindungsstift (10) gedrückt wird, und dies gegen die Rückstellkraft, die von einer Öffnungsfeder (32) koaxial zu dem Verbindungsstift (10) ausgeübt wird.
  5. Elektrische Heizvorrichtung (1) nach Anspruch 4, dadurch gekennzeichnet, daß der Verbindungsstift (10) innerhalb der thermischen Sicherung (20) von einem Isolator (34) umgeben ist.
  6. Elektrische Heizvorrichtung (1) nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, daß die thermische Pille (24) am Ende des Gehäuses der Sicherung liegt, das außerhalb der rohrförmigen Ummantelung (2) liegt.
EP01903905A 2000-01-13 2001-01-10 Heizelement mit thermischer sicherheitsvorrichtung Expired - Lifetime EP1247429B2 (de)

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 (de) 2002-10-09
EP1247429B1 true EP1247429B1 (de) 2003-05-07
EP1247429B2 EP1247429B2 (de) 2009-07-08

Family

ID=8845886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01903905A Expired - Lifetime EP1247429B2 (de) 2000-01-13 2001-01-10 Heizelement mit thermischer sicherheitsvorrichtung

Country Status (9)

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

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK1233650T3 (da) * 2001-01-24 2006-12-18 Leister Process Tech Varmluftsanordning
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.

Family Cites Families (11)

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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
DE2514584B2 (de) † 1975-04-03 1979-02-01 G. Bahlmann Kg Gmbh & Co, 5890 Schalksmuehle Elektrisches Tauchheizgerät
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, Ch
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

Also Published As

Publication number Publication date
EP1247429A1 (de) 2002-10-09
ATE240027T1 (de) 2003-05-15
US6710310B2 (en) 2004-03-23
ES2198395T3 (es) 2004-02-01
WO2001052601A1 (fr) 2001-07-19
ES2198395T5 (es) 2009-11-27
PT1247429E (pt) 2003-09-30
AU3186601A (en) 2001-07-24
DE60100257D1 (de) 2003-06-12
US20030010772A1 (en) 2003-01-16
FR2803976A1 (fr) 2001-07-20
EP1247429B2 (de) 2009-07-08
DE60100257T2 (de) 2004-04-01
FR2803976B1 (fr) 2002-05-17
DE60100257T3 (de) 2010-01-14

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