EP0057171B1 - Elément chauffant auto-régulateur - Google Patents

Elément chauffant auto-régulateur Download PDF

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Publication number
EP0057171B1
EP0057171B1 EP19820890011 EP82890011A EP0057171B1 EP 0057171 B1 EP0057171 B1 EP 0057171B1 EP 19820890011 EP19820890011 EP 19820890011 EP 82890011 A EP82890011 A EP 82890011A EP 0057171 B1 EP0057171 B1 EP 0057171B1
Authority
EP
European Patent Office
Prior art keywords
small metal
recess
heating member
heating element
groove
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
Application number
EP19820890011
Other languages
German (de)
English (en)
Other versions
EP0057171A3 (en
EP0057171A2 (fr
Inventor
Walther Dr. Menhardt
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.)
DR. PETER NESVADBA GESELLSCHAFT M.B.H.
Original Assignee
Dr Peter Nesvadba GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=3487480&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0057171(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Dr Peter Nesvadba GmbH filed Critical Dr Peter Nesvadba GmbH
Publication of EP0057171A2 publication Critical patent/EP0057171A2/fr
Publication of EP0057171A3 publication Critical patent/EP0057171A3/de
Application granted granted Critical
Publication of EP0057171B1 publication Critical patent/EP0057171B1/fr
Expired 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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • 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
    • H05B3/10—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
    • H05B3/12—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material
    • H05B3/14—Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor characterised by the composition or nature of the conductive material the material being non-metallic
    • H05B3/141—Conductive ceramics, e.g. metal oxides, metal carbides, barium titanate, ferrites, zirconia, vitrous compounds

Definitions

  • the invention relates to a self-regulating heating element with at least one resistance heating element made of current-conducting ceramic material, which is arranged in an envelope and has a positive temperature coefficient of electrical resistance, which heating element is inserted between two metal blocks that are directly pressed against its side faces and are electrically insulated from one another. wherein the heat transfer to the outside surface of these metal blocks is larger than the contact area between the heater and the metal blocks.
  • the energy consumption of the resistance heater connected to a voltage source is adjusted without further action, that is to say without a switching measure or the like, such that the resistance heater assumes a certain temperature which is essentially dependent on its material composition.
  • This connection of effects now keeps the temperature of the resistance radiator itself connected to the voltage source practically constant, but is not able to achieve the desired temperature for the heating element's cover, from which the generated heat is taken, with the heating elements of this type which have become known or have been described so far To keep the extent constant, especially not when the heat dissipation fluctuates from the casing.
  • DE-A-2 551 980 discloses a heating element designed as mentioned above, in which there is an axial stacking of ceramic radiators and metal bodies, the stack thus formed being inserted into a tubular ceramic shell and being held together by springs which are against transverse walls of this ceramic shell support. In this way, only a relatively low contact pressure between the metal bodies and the radiators is achieved, and the whole arrangement requires a relatively large effort for their assembly.
  • the aim of the invention is to provide a self-regulating heating element of the type mentioned at the beginning, in which the disadvantages mentioned above are eliminated and in which the casing also has a largely constant temperature.
  • the self-regulating heating element of the type mentioned at the outset is characterized in that the one metal block has a groove-like recess into which the heating element and the second metal block are inserted, one side of the heating element on one side wall of this recess and the second side of the heating element on second metal block and the second metal block on the other side of this recess, and between the second metal block and its contact surface on the groove-like recess, an electrical insulation is inserted, and the pressure of the metal blocks on the radiator is created by forces absorbed within the groove-like recess, or that the structure consisting of the radiator, the two metal blocks and an insulation fitted around the outer surface of the same is inserted snugly between compressible walls of a housing, which from a clamp engaging on the outside of these walls r generation of the pressure between the metal blocks and the radiator are pressed together.
  • the one metal block has a groove-like recess into which the heating element and the second metal block are inserted, it is furthermore possible to achieve a particularly low thermal resistance
  • radiator with the second metal block is pressed into the groove-like recess of the first metal block in a strictly fitting manner and that the heating element rests under pressure on the metal block due to this constraint. It is further advantageous both in terms of simple assembly and in terms of keeping the thermal resistance in an insulation laid around the outer surface of the metal blocks if it is provided that the electrical connecting wires are inserted into the groove-like recess above or below the radiator.
  • a particularly simple design with regard to the production of the electrical connections of the connecting wires is characterized in that the connecting wires are pressed against the first metal block containing the groove-like recess and the second metal block to form an electrical connection.
  • the heating element in which the structure consisting of the radiator, the two metal blocks and an insulation mounted around the outer surfaces of the same is fitted snugly between two walls of a housing, which are pressed together with a clamp, it is when a metal plate should be heated, both for the assembly and to achieve a low thermal resistance further advantageous that the elastically compressible housing walls are integrated with a metal plate to be heated.
  • a resistance heating element 1 is provided, which is made of current-conducting ceramic material and has a positive temperature coefficient of electrical resistance.
  • This heating element 1 is inserted between two metal blocks 3, 9 lying directly on its side surfaces.
  • the one metal block 9 has a groove-like recess 10, into which the heating element 1 and the second metal block 3 are inserted.
  • the second metal block 3 in turn bears against the other side wall 12 of the recess 10 and is insulated from the first metal block 9 by an electrically insulating film 14 which is inserted between the metal block 3 and the side wall 12.
  • the heating element 1 with the second metal block 3 is pressed into the groove-like recess 10 of the first metal block 9 so that it fits tightly, so that the heating element 1 rests under pressure on the two metal blocks.
  • the surface 15 of the metal block 9 which serves for heat transfer to the outside is larger than the contact surface between the heating element 1 and the metal block; this results both from the fact that the radiator 1 is shorter than the metal blocks 9, 3 ( Figure 2), and from the fact that the circumferential dimensions of the metal block 9 are significantly larger than those of the radiator 1 ( Figure 1).
  • the structure of the heating element shown in Figures 1 and 2 is sufficiently stable to be able to attach this heating element at any point where there is a need for heat. If electrical insulation is required, this heating element can easily be provided with such insulation. If desired, it is also possible to use a heat-conducting compound to fill in any cavities that may have arisen in the course of production and that are present in the structure of the heating element. The introduction of such a mass can take place in the course of the assembly of the individual parts of the heating element or also after the assembly from the front side, and such a mass can also serve to design cavities such as. B. fill or seal the spaces on both sides of the radiator 1.
  • connecting wires can be led to connection points provided directly on the radiator 1. In terms of construction, it is simpler and more compact, however, to carry out the power supply via the metal blocks resting on the radiator and to electrically connect the connecting wires to the metal blocks. With regard to the laying of the electrical connecting wires, it is advantageous in the embodiment according to FIGS. 1 and 2 if these connecting wires 16, 17 are inserted into the groove-like recess 10 above or below the radiator 1, as shown in FIG. 3. This is particularly advantageous if the heating element is to be fitted into a recess in a housing or a body to be heated, as shown in FIG. 4.
  • connecting wires 16, 17 In order to connect the connecting wires 16, 17 electrically to the metal blocks 9. 3, one can, for. B. weld the bare ends of these leads to the metal blocks. As a rule, a sufficiently firm one is sufficient Pressing the bare ends onto the metal blocks, which technique is used in the embodiment according to FIG. 4.
  • the connecting wires 16, 17, which are sheathed with insulation, are guided side by side in the cavity located above the radiator 1, and the bare end of each of these two connecting wires is pressed against a metal block.
  • the connecting wires can advantageously be guided side by side, as shown in FIG. 4, a strip 18 consisting of insulating material electrically isolating the two connecting wires 16, 17 from one another and simultaneously mechanically supporting the entire structure.
  • an insulation 21 made of an electrically insulating film is provided between the outer surface of the metal block 9 and the housing 20.
  • the structure consisting of the radiator 1, the metal blocks and the insulation 21 is inserted into the housing 20 in a closely fitting manner.
  • the radiator 1 is inserted between two plate-shaped metal blocks 2, 3, and the structure thus formed is inserted into a housing in the form of a metal U-rail 22 with the interposition of insulation 21.
  • the insulation 21 can be designed in one or more layers depending on the special requirements, and, as has already been mentioned in connection with the embodiments described above, a heat-conducting mass can also be provided for filling cavities which are present in the structure .
  • the dimensions of the U-profile 22 forming the housing are chosen in the embodiment according to FIG. 5 such that the walls 23, 24 of the housing resiliently bear elastically on the structure consisting of the heating element and the metal blocks and the insulation.
  • a clamp 25 is provided which compresses the walls 23, 24.
  • a metal housing surrounding the radiator 1 with the metal plates 2, 3 lying thereon and a multi-layer insulation 21 is provided, which is integrated with a metal plate 25 which is to be heated.
  • a spring 25 is provided which compresses the walls 23, 24 of the metal housing and thereby ensures an intimate contact of the metal plates 2, 3 on the heating element 1 and a low thermal resistance between these metal plates and the metal housing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Resistance Heating (AREA)

Claims (5)

1. Elément chauffant à autorégulation comprenant au moins un corps chauffant à résistance disposé dans une enveloppe et en matière céramique conductrice de courant avec un coefficient de température positif de la résistance électrique, le corps chauffant étant inséré entre deux blocs métalliques se trouvant comprimés directement sur ses faces latérales et qui sont isolés les uns des autres électriquement, la face externe de ces blocs métalliques servant à la transmission de chaleur vers l'extérieur étant plus grande que la face de contact entre le corps chauffant et les blocs métalliques, l'élément chauffant étant caractérisé en ce que l'un des blocs métalliques (9) comporte un évidement (10) en forme de gorge dans lequel sont insérés le corps chauffant (1) et le deuxième bloc métallique (3), un côté du corps chauffant (1) se trouvant sur l'une des parois latérales de cet évidement (10), le deuxième ,côté du corps chauffant se trouvant sur le deuxième bloc métallique (3) et le deuxième bloc métallique (3) se trouvant sur l'autre côté de cet évidement, et un isolant électrique (14) étant inséré entre le deuxième bloc métallique (3) et sa face d'appui sur l'évidement en forme de gorge (10), et la pression des blocs métalliques sur le corps chauffant résulte alors de forces reçues à l'intérieur de l'évidement en forme de gorge (10), ou en ce que l'ensemble constitué par les deux blocs métalliques, le corps chauffant (1) et un isolant disposé sur la face externe de ceux-ci est introduit de façon ajustée entre les parois compressibles (23, 24) d'un boîtier, celles-ci étant comprimées par une pince (25) s'appliquant extérieurement sur ces parois (23, 24) pour produire la pression entre les blocs métalliques et le corps chauffant.
2. Elément chauffant à autorégulation selon la revendication 1, caractérisé en ce que le corps chauffant (1) est comprimé avec le deuxième bloc . métallique (3) de façon ajustée dans l'évidement en forme de gorge (10) du premier bloc métallique (9) et le corps chauffant repose par cette contrainte sous pression sur les blocs métalliques.
3. Elément chauffant à autorégulation selon la revendication 1 ou la revendication 2, caractérisé en ce que, dans l'évidement en forme de gorge (10), on introduit au-dessus ou en dessous du corps chauffant (1), les fils de raccordement électrique (16, 17).
4. Elément chauffant à autorégulation selon la revendication 3, caractérisé en ce que les fils de raccordement (16, 17) sont comprimés pour former une liaison électrique sur le premier bloc métallique (9) contenant l'évidement en forme de gorge (10) et sur le deuxième bloc métallique (3).
5. Elément chauffant à autorégulation selon la revendication 1, caractérisé en ce que les parois de boîtier (23, 24) comprimables élastiquement - sont intégrées à une plaque métallique à chauffer (25).
EP19820890011 1981-01-26 1982-01-26 Elément chauffant auto-régulateur Expired EP0057171B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT32181A AT394296B (de) 1981-01-26 1981-01-26 Selbstregelndes heizelement
AT321/81 1981-01-26

Publications (3)

Publication Number Publication Date
EP0057171A2 EP0057171A2 (fr) 1982-08-04
EP0057171A3 EP0057171A3 (en) 1982-08-25
EP0057171B1 true EP0057171B1 (fr) 1986-10-01

Family

ID=3487480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820890011 Expired EP0057171B1 (fr) 1981-01-26 1982-01-26 Elément chauffant auto-régulateur

Country Status (3)

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EP (1) EP0057171B1 (fr)
AT (1) AT394296B (fr)
DE (1) DE3273500D1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4523079A (en) * 1983-09-20 1985-06-11 Black & Decker Inc. Electric iron having electronic control circuit with a power resistor mounted on the soleplate
FR2568438B1 (fr) * 1984-07-25 1986-10-17 Seb Sa Chaudiere pour appareil menager electrique
EP0262243B1 (fr) * 1986-10-01 1991-02-20 David & Baader DBK Spezialfabrik elektrischer Apparate und Heizwiderstände GmbH Résistance chauffante à coéfficient de température positif
US5362164A (en) * 1993-09-23 1994-11-08 Electro-Matic Staplers, Inc. Glue gun heat housing
US5451921A (en) * 1993-10-04 1995-09-19 Raychem Corporation Electrical devices
DE19600069C2 (de) * 1996-01-03 2002-07-11 Walther Menhardt Elektrischer PTC-Heizkörper
DE102019109482A1 (de) * 2019-04-10 2020-10-15 Eichenauer Heizelemente Gmbh & Co. Kg Heizvorrichtung

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214719A (en) * 1964-03-20 1965-10-26 Westinghouse Electric Corp Thermistor device
US3996447A (en) 1974-11-29 1976-12-07 Texas Instruments Incorporated PTC resistance heater
DE2805427A1 (de) 1977-02-21 1978-08-24 Philips Nv Heizelement mit einem ptc-widerstandskoerper
DE2107365C3 (de) 1971-02-16 1979-03-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Kaltleiterkombination fur die Entmagnetisierung von Farbfernsehgeräten
DE2743880A1 (de) 1977-09-29 1979-04-05 Siemens Ag Heizeinrichtung mit einem optimierten heizelement aus kaltleiter-material
DE2806159A1 (de) 1978-02-14 1979-08-16 Siemens Ag Tauchsieder
EP0009136A2 (fr) 1978-09-15 1980-04-02 Siemens Aktiengesellschaft Dispositif de préchauffage pour mazout
DE2845965A1 (de) 1978-10-21 1980-04-24 Eichenauer Fa Fritz Elektrisches widerstandsheizelement
DE2614433C3 (de) 1975-04-07 1981-10-01 Naamloze Vennootschap Philips' Gloeilampenfabrieken, Eindhoven Selbstregelndes Heizelement

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124719A (en) * 1964-03-10 Surface combustion apparatus for
GB117099A (en) * 1917-05-03 1918-07-03 Arthur Francis Berry Improvements in or relating to Electrical Heating Apparatus.
CH104745A (de) * 1923-05-03 1924-06-02 Schweizerische Gasapparatefabr Elektrische Kochplatte.
CH241718A (de) * 1946-02-06 1946-03-31 Oeschger Oskar Elektrischer Heizkörper.
US4086467A (en) * 1976-07-19 1978-04-25 Texas Instruments Incorporated Electronic heater for high voltage applications
DE2816076A1 (de) * 1978-04-13 1979-10-25 Siemens Ag Heizer mit ferroelektrischem keramik-heizelement
DE2966703D1 (en) * 1979-07-18 1984-03-29 Elpag Ag Chur Heating device for electrically heated apparatuses

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3214719A (en) * 1964-03-20 1965-10-26 Westinghouse Electric Corp Thermistor device
DE2107365C3 (de) 1971-02-16 1979-03-22 Siemens Ag, 1000 Berlin Und 8000 Muenchen Kaltleiterkombination fur die Entmagnetisierung von Farbfernsehgeräten
US3996447A (en) 1974-11-29 1976-12-07 Texas Instruments Incorporated PTC resistance heater
DE2614433C3 (de) 1975-04-07 1981-10-01 Naamloze Vennootschap Philips' Gloeilampenfabrieken, Eindhoven Selbstregelndes Heizelement
DE2805427A1 (de) 1977-02-21 1978-08-24 Philips Nv Heizelement mit einem ptc-widerstandskoerper
DE2743880A1 (de) 1977-09-29 1979-04-05 Siemens Ag Heizeinrichtung mit einem optimierten heizelement aus kaltleiter-material
DE2806159A1 (de) 1978-02-14 1979-08-16 Siemens Ag Tauchsieder
EP0009136A2 (fr) 1978-09-15 1980-04-02 Siemens Aktiengesellschaft Dispositif de préchauffage pour mazout
DE2845965A1 (de) 1978-10-21 1980-04-24 Eichenauer Fa Fritz Elektrisches widerstandsheizelement

Also Published As

Publication number Publication date
DE3273500D1 (en) 1986-11-06
AT394296B (de) 1992-02-25
EP0057171A3 (en) 1982-08-25
EP0057171A2 (fr) 1982-08-04
ATA32181A (de) 1991-08-15

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