EP1278400B1 - Heizelement - Google Patents

Heizelement Download PDF

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Publication number
EP1278400B1
EP1278400B1 EP02291837A EP02291837A EP1278400B1 EP 1278400 B1 EP1278400 B1 EP 1278400B1 EP 02291837 A EP02291837 A EP 02291837A EP 02291837 A EP02291837 A EP 02291837A EP 1278400 B1 EP1278400 B1 EP 1278400B1
Authority
EP
European Patent Office
Prior art keywords
power switch
shell
envelope
heater element
element according
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
EP02291837A
Other languages
English (en)
French (fr)
Other versions
EP1278400A2 (de
EP1278400A3 (de
Inventor
David Andre
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.)
Jedac
Original Assignee
Jedac
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 Jedac filed Critical Jedac
Publication of EP1278400A2 publication Critical patent/EP1278400A2/de
Publication of EP1278400A3 publication Critical patent/EP1278400A3/de
Application granted granted Critical
Publication of EP1278400B1 publication Critical patent/EP1278400B1/de
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
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0275—Heating of spaces, e.g. rooms, wardrobes
    • H05B1/0283—For heating of fluids, e.g. water heaters
    • 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
    • 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
    • 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
    • H05B3/78—Heating arrangements specially adapted for immersion heating
    • H05B3/82—Fixedly-mounted immersion heaters

Definitions

  • the present invention relates to a heating element intended for example to be used for heating of a heat transfer fluid, in particular water, contained in inside a sealed enclosure.
  • a heat transfer fluid in particular water
  • a heating element of this type generally comprises a resistive element which is arranged inside a tubular envelope of thermally conductive material and which is connected to a power circuit by through a power switch.
  • heating elements to double envelope in which two tubular envelopes thermally conductive are arranged coaxially one in relation to the other.
  • the single envelope or the outer shell of the heating element passes through the enclosure wall to be immersed in the fluid on most of its length with its end closed located on the interior side of the enclosure and its open end located on the outside to allow the electrical connection of the resistive element.
  • the envelope When crossing the wall of the enclosure, the envelope is contained in a mounting flange which ensures faith its maintenance in position and the necessary tightness by compared to the wall of the enclosure.
  • the mounting flange is made of material thermally conductive and present in its thickness a housing in which the switch is installed power in such a way that the mounting flange allows dissipation of the heat generated during power switch operation. This allows particularly effective way of limiting heating of the power switch or otherwise said, to provide cooling for the power switch.
  • a heating element comprising an envelope receiving a heating resistance embedded in a insulating material and connected to a power source via a temperature-sensitive element placed in a envelope cavity to cut power to the heating resistance as a function of temperature.
  • the heating element is arranged in such a way that it prevails the same temperature in the cavity at the sensitive element only in the surrounding insulating material resistance to control the power cut with good precision.
  • it there is no question of cooling the sensitive element which on the contrary, must be subjected to the most possible close to that of the heating resistance.
  • the teaching of this document cannot therefore be used to solve the problem posed above.
  • a heating element comprising at least one thermally conductive tubular casing receiving at minus a resistive element connected to a power circuit comprising a power switch which is fixed in the envelope by means of heat exchange means between the power switch and the enclosure.
  • the tubular casing ensures by contact with this heat transfer fluid heat dissipation function generated during the operation of the power.
  • the binding of the envelope to the wall of the enclosure also contributes to heat dissipation via the enclosure. This allows for an exchange surface relatively large for switch cooling power while maintaining a limited footprint. Efficient cooling of the power switch thus obtained increases the service life of this last.
  • the tubular casing also provides Protection function of the power switch vis-à-vis external aggressions and facilitates insulation power switch in relation to the middle outside.
  • the invention is here represented and described in connection with an individual heating element, intended for be mounted on an enclosure of fluid to be heated (not shown) using a mounting flange (itself not shown) designed to be screwed into a tapped hole provided in the wall of this enclosure.
  • a mounting flange itself not shown
  • Other types of equivalent mounting are of course conceivable.
  • the heating element designated by the general reference 1 includes a resistor shielded electrical system that has a metal casing 2 inside which is arranged an element resistive 3 in the form here of a resistant wire arranged helically.
  • the resistive element 3 extends in an electrically insulating refractory material such as powdered magnesia 4, compacted inside the metal casing 2.
  • the resistive element has two ends 3a, 3b connected to electrical conductors 5, 6 which pass through a shutter element 7 to be connected to a power circuit.
  • the shutter element 7 hermetically divides the metal casing 2 in two sections 2a, 2b, the resistive element 3 being contained in section 2a.
  • the shutter element 7 is preferably made of a thermally insulating material.
  • the power circuit is not fully visible in Figure 1 and only one power switch 8 is shown schematically in this figure.
  • Power switch 8 is a connected triac to the rest of the power circuit by cables 9 and is mounted in section 2b of the metal casing 2.
  • the power switch 8 is received in a cavity 10 which is formed in a sole 11 and which has a bottom 12 against which the power switch 8 is plate.
  • the cavity 10 is filled with a hardened resin 13 electrically insulating which keeps it in position of the power switch 8 relative to the sole 11.
  • the sole 11 is made of a thermally material conductor such as brass and present at opposite of cavity 10 one face 14 in cylinder portion of circular section having a radius substantially equal to the internal radius section 2b of the envelope 2.
  • the face 14 of the sole 11 is in abutment against a portion of the internal surface of section 2b of envelope 2 via an electrically insulating layer 15.
  • the insulating layer 15 can comprise one or two flexible mica sheets or an elastomer adapted by example based on silicone, possibly associated with a thermally conductive and electrically insulating grease. In the case where an isolated triac is used, the layer 15 is optional in the context of a simple isolation.
  • An electrically insulating and hardened resin 16 fills section 2b of envelope 2 extending beyond of the shutter 7 and keeps the sub-assembly in position constituted by the power switch 8, the electrically insulating layer 15 and the sole 11. During of the manufacturing, we will insist on the quality of the contacts parts between them which must allow the establishment a heat exchange link between the power switch 8 and enclosure 2.
  • the heat produced by the power switch 8 during operation is dissipated via the sole 11 by the casing 2 in contact with the heat transfer fluid to be heated.
  • the flange is made of a thermally conductive material, part of heat produced by the power switch is also dissipated via the flange through the wall of the enclosure to which the heating element is attached.
  • the power switch 8 is located in a medium (within cavity 10) which tends to be mainly subject to the temperature of the heat transfer fluid and not that of the resistive element 3, which favors cooling the power switch 8.
  • a medium within cavity 10
  • means of thermal insulation can be provided between cavity 10 and the area of the heating element immediately adjacent to the resistive element 3.
  • the armored resistance is contained inside a second envelope 17 which extends coaxially with respect to the envelope 2 and which has an open end 17a and a closed end 17b.
  • the envelope 17 is here made of a metal such than stainless steel but can also be made in any thermally conductive material.
  • Envelope 17 is partially filled with electrically insulating refractory material such as magnesia 26, compacted inside the envelope 17, material in which the envelope 2 is included.
  • a part of the envelope 17 adjacent to its open end 17a extends beyond the envelope 2 and receives the power switch 8 which, unlike the previous realization, is no longer placed in the envelope 2.
  • the shutter element 7 is then adjacent to the open end of the casing 2 so that it closes it.
  • the power switch 8 is mounted on a sole 11 having a cavity 10 having a bottom 12 and side walls electrically coated insulator 18. Electrically hardened resin 13 insulator fills the cavity 10 and holds the switch of power 8 in position.
  • the sole 11 is as before made of a thermally conductive material, here brass, and has a face 14 opposite to the cavity 10 which has a cylindrical portion shape of circular section with a radius substantially equal to inner radius of the envelope 17.
  • Maintaining the sole 11 in position in the corresponding part of the envelope 17 is provided by an electrically insulating hardened resin 23 which is contained in this part of the envelope.
  • a groove 24 is formed axially in the face 14 of the sole 11.
  • the assembly operations of the sub-assembly incorporating power switch 8 start with setting in place of the insulating layer 18 in the cavity 10 of such that this insulating layer covers the bottom 12 and the side walls of the cavity 10. Then, the switch of power 8 is placed in the cavity 10 before an electrically insulating resin 13 is introduced in the cavity 10.
  • the resin 13 once hardened does not completely cover the power switch here 8 and mainly provides a holding function in position of the power switch 8 and of the layer insulator 18 in the cavity 10.
  • the sole 11 is then mounted in the envelope 17 so that the face 14 is applied against the internal surface of the envelope 17 then the resin 23 is introduced into the envelope 17.
  • the resin is introduced by the groove 4 so as to obtain filling the adjacent part of the envelope 17 at its end 17a similar to the filling obtained by source casting. This prevents bubbles air are trapped in the resin 23. The bleeding 24 thus facilitates the filling of the envelope. Resin 23 once cured ensures retention in the envelope 17 of the sole 11 and also performs a function electrical insulation.
  • Tapping 24 has another advantage when the envelope 17 is obtained by winding a sheet on itself then welding the edges of it. Indeed, in this case the envelope 17 has an internal bulge 25 corresponding to the weld, which can be housed in the grooved 24 so that the internal bulge 25 does not prevent not obtaining a good adaptation of the face 14 with the internal surface of the envelope 17.
  • the sole 11 has opposite of its face 14 in a portion of a cylinder of circular section, a flat face 19 on which the switch power 8 is fixed.
  • An insulating layer 18 is interposed between face 19 and power switch 8.
  • the the power switch 8 is fixed to the by means of a screw 20 which passes through a hole 21 made in the power switch 8 and fitted with a jacket shouldered 22 of electrically insulating material which, in cooperating with the insulating layer 18, electrically insulates the sole 11 and the screw 20 of the power switch 8.

Landscapes

  • Resistance Heating (AREA)

Claims (8)

  1. Heizelement umfassend zumindest eine rohrförmige, wärmeleitfähige Umhüllung (2, 17), die zumindest ein Widerstandselement (3) aufnimmt, das mit einem Stromkreis in Verbindung steht, der einen Stromschalter (8) umfasst, dadurch gekennzeichnet, dass der Stromschalter in der Umhüllung über Mittel (11) zum Austausch von Wärme zwischen dem Stromschalter und der Umhüllung befestigt ist, welche die Funktion der Ableitung von Wärme sicherstellen, die beim Betrieb des Stromschalters (8) erzeugt wird.
  2. Heizelement nach Anspruch 1, dadurch gekennzeichnet, dass der Stromschalter (8) an einem Abschnitt der Innenfläche der Umhüllung (2, 17) anliegt.
  3. Heizelement nach Anspruch 2, dadurch gekennzeichnet, dass der Stromschalter (8) an einer wärmeleitfähigen Platte (11) befestigt ist, deren eine Fläche (14) eine im wesentlichen dem Abschnitt der Innenfläche der Umhüllung (2, 17) entsprechende Form hat.
  4. Heizelement nach Anspruch 3, dadurch gekennzeichnet, dass der Stromschalter (8) in einer Aussparung (10) der Platte (11) aufgenommen ist, die einen Boden (12) umfasst, auf dem der Stromschalter liegt und die ein elektrisch isolierendes Harz (13) enthält, in das der Stromschalter eingebettet ist.
  5. Heizelement nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass zwischen dem Stromschalter (8) und der Platte (11) zumindest eine elektrisch isolierende Schicht (18) angeordnet ist.
  6. Heizelement nach einem der vorhergehenden Ansprüche 3 bis 5, dadurch gekennzeichnet, dass zwischen der Platte (11) und der Innenfläche der Umhüllung (2, 17) zumindest eine elektrisch isolierende Schicht (15) angeordnet ist.
  7. Heizelement nach einem der Ansprüche 3 bis 6, dadurch gekennzeichnet, dass die Platte (11) durch ein in der Umhüllung enthaltenes Harz (16, 23) in ihrer Position in der Umhüllung gehalten ist.
  8. Heizelement nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass es zwei wärmeleitfähige, koaxial zueinander angeordnete Umhüllungen (2, 17) umfasst, nämlich eine innere Umhüllung (2) und eine äußere Umhüllung (17), und dass das Widerstandselement (3) in der inneren Umhüllung und der Strom schalter (8) in der äußeren Umhüllung angeordnet ist.
EP02291837A 2001-07-20 2002-07-19 Heizelement Expired - Lifetime EP1278400B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0109723A FR2827735B1 (fr) 2001-07-20 2001-07-20 Element chauffant
FR0109723 2001-07-20

Publications (3)

Publication Number Publication Date
EP1278400A2 EP1278400A2 (de) 2003-01-22
EP1278400A3 EP1278400A3 (de) 2003-03-19
EP1278400B1 true EP1278400B1 (de) 2004-05-12

Family

ID=8865746

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02291837A Expired - Lifetime EP1278400B1 (de) 2001-07-20 2002-07-19 Heizelement

Country Status (5)

Country Link
EP (1) EP1278400B1 (de)
AT (1) ATE266938T1 (de)
DE (1) DE60200470T2 (de)
ES (1) ES2219625T3 (de)
FR (1) FR2827735B1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVI20030248A1 (it) 2003-12-09 2005-06-10 Luigi Borelli Gruppo riscaldante per elementi radianti a fluido diatermico
ITVI20040120A1 (it) * 2004-05-18 2004-08-18 Lacroix Electronique Srl Ponte termico per la dissipazione del calore prodotto da circuiti di comando applicabili ad elementi radianti a fluido
CA2743308A1 (en) * 2008-12-19 2010-06-24 Kaiten Technology Electronic (Guangzhou) Ltd Vehicular fluid heater
ITVI20120103A1 (it) * 2012-05-02 2013-11-03 Ht S P A Dispositivo riscaldante per fluidi
FR3007828B1 (fr) * 2013-07-01 2017-12-08 Atlantic Industrie Sas Element chauffant et chauffe-eau comportant un tel element chauffant
EP2925085B1 (de) * 2014-03-27 2018-08-08 Shengquan Liang Elektrischer Durchlauferhitzer und Erwärmungsvorrichtung mit einem solchen Erhitzer
FR3019630B1 (fr) * 2014-04-03 2019-03-29 Atlantic Industrie Bride chauffante et chauffe-eau equipe d'une telle bride
IT202200008582A1 (it) * 2022-04-29 2023-10-29 Ht S P A Dispositivo riscaldante per fluidi

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480174A (en) * 1981-09-11 1984-10-30 Acra Electric Corporation Thermostatically controlled electric compressor sump heater having self-contained thermostat
FR2623685A1 (fr) * 1987-11-19 1989-05-26 Andre David Element chauffant electrique a tube en verre et a dispositif de securite detectant la defaillance de ce dernier
DE29920503U1 (de) * 1999-11-23 2000-02-24 Tuerk & Hillinger Gmbh Elektrische Heizpatrone

Also Published As

Publication number Publication date
DE60200470D1 (de) 2004-06-17
ATE266938T1 (de) 2004-05-15
ES2219625T3 (es) 2004-12-01
EP1278400A2 (de) 2003-01-22
FR2827735B1 (fr) 2003-09-12
EP1278400A3 (de) 2003-03-19
FR2827735A1 (fr) 2003-01-24
DE60200470T2 (de) 2005-05-25

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