EP2481259A1 - Tubular heater and method for production of such a tubular heater - Google Patents

Tubular heater and method for production of such a tubular heater

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Publication number
EP2481259A1
EP2481259A1 EP10754932A EP10754932A EP2481259A1 EP 2481259 A1 EP2481259 A1 EP 2481259A1 EP 10754932 A EP10754932 A EP 10754932A EP 10754932 A EP10754932 A EP 10754932A EP 2481259 A1 EP2481259 A1 EP 2481259A1
Authority
EP
European Patent Office
Prior art keywords
silicone
tubular heater
insulating material
tubular
jacket
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.)
Granted
Application number
EP10754932A
Other languages
German (de)
French (fr)
Other versions
EP2481259B1 (en
Inventor
Manfred Schulz
Wolfgang Thimm
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.)
EGO Elektro Geratebau GmbH
Original Assignee
EGO Elektro Geratebau GmbH
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Publication date
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Application filed by EGO Elektro Geratebau GmbH filed Critical EGO Elektro Geratebau GmbH
Priority to PL10754932T priority Critical patent/PL2481259T3/en
Publication of EP2481259A1 publication Critical patent/EP2481259A1/en
Application granted granted Critical
Publication of EP2481259B1 publication Critical patent/EP2481259B1/en
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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 invention relates to a tubular heater and a method for producing such a tubular heater.
  • tubular heaters are often used for example in electric heaters such as ovens to heat them.
  • electric heaters such as ovens
  • the trend is towards increasingly high operating temperatures, in particular for pyrolysis of the oven muffle, and, for reasons of energy efficiency, increasingly thicker thermal insulations.
  • This development means that the temperatures in the connection area of a tubular heater continue to rise.
  • the unheated length of the tubular heater could be increased.
  • the space inside the oven is very limited and a certain power is required, this is usually not.
  • the invention has for its object to provide a tubular heater mentioned above and a method for its production, which can be avoided with the problems of the prior art and especially allow higher temperatures in the connection area or at the connection section of a tubular heater.
  • the tubular heater has a tubular jacket and at least one heating conductor extending in the tubular jacket, wherein insulating material is provided therebetween, usually magnesium oxide or the like.
  • the heating conductor is provided in an attachment section of the tubular heater with an electrical connection, for example in a simple plug form.
  • the insulating material is mixed with silicone in the area of the connection section or contains silicone in order to prevent the penetration of water or moisture into the pipe jacket or into the pipe heater.
  • the silicone has an RTI value of at least 150.
  • the silicone has an RTI value of at least 200, particularly advantageously at least 220.
  • the RTI value (Relative Temperature Index) is a measure of the thermal aging resistance according to UL, which is as it were. - - the US VDE is. Normally used sealing qualities of silicone for electric tubular heaters have a maximum RTI value of 105.
  • a further advantage of the use of silicone with such a high RTI value is that hitherto used polymers or silicone crosslinkers for silicones from the low-temperature range can continue to be used.
  • the silicone may be in the form of an oil or resin and then introduced into the tubular heater to impregnate or coat the insulating material in the foremost region. It can be in polymer form. It may penetrate a few mm into the tubular heater, but should not penetrate too far, otherwise the operating temperature of the tubular heater is too high for the silicone, even at high RTI value. So it can be beneficial introduced or penetrate maximally 10mm deep. - -
  • such a silicone can advantageously be designed with respect to combustibility such that it has at least fire protection class HB, particularly advantageously even V-0.
  • a silicone crosslinker can be provided or it can be added.
  • the normal insulating material is introduced between the heating conductor and the tube jacket and then in the connection section just the special silicone. This can be solidified or cured or bonded during or after the introduction. Subsequently, a conventional insulating bead can be attached to the pipe jacket as a conclusion of the tubular heater, possibly even with a conventional sealant in between.
  • FIG. 1 a section through a tubular heater according to the invention is shown in Fig. 1.
  • the tubular heater 1 1 has a tube jacket 13, in which a coiled heating conductor 15 extends along the dash-dotted center longitudinal axis.
  • Pipe jacket 13 and heating element 15 are advantageously formed as from the prior - -
  • An intermediate space 17 between the heating conductor 15 and the tube jacket 13 is filled with an insulating material 18.
  • this insulating material may be in pulverulent or granular form and, for example, also be compressed in the tube jacket 13.
  • the tubular heater 1 1 is stable and the heating conductor 15 can by no means come into contact with the tube jacket 13.
  • connection portion 20 specifically where the tube shell 13 has an end 21 which is open to the left.
  • end 21 a likewise known per se Isolierperle 23 is introduced, advantageously made of plastic or ceramic material. It can be fixed or glued with an additional sealing compound 24 and be held centrally in the tube shell 13.
  • connection portion 20 with Isolierperle 23 and terminal pin 25 largely corresponds to the prior art.
  • the dashed lines to the top right illustrated insulating material 18 is present.
  • the insulating material 18 extends up to the sealing compound 24.
  • the insulating material 18 according to the invention the novel silicone mixed, so that a mixing region 28 is formed, which is shown diagonally dashed left above.
  • This silicone for the mixing area 28 is designed as described above, so it is a - called gangs silicone material and may be liquid or pasty. Thus it can be filled through the open end 21 of the tubular jacket 13 to mix with the granular insulating material 18 and, if necessary, cured.
  • the mixing region 28 with the silicone extends from the sealant 24 to the right into the tube jacket 13. If the sealing compound 24 is omitted, the mixing area 28 with the silicone can also be connected directly to the insulating bead 23. Furthermore, the mixing region 28 extends to the right until just before the connection of the connecting bolt 25 to the heating conductor 15 or the connecting region 26. However, this does not necessarily have to be the case.
  • the transition between the mixing region 28 and the region with the insulating material 18 without silicone right next to it is very abrupt or abrupt, namely as a line or as a boundary layer 29.
  • the length of the mixing region 28 may be a few mm, for example 10mm to 20mm or even 40mm
  • Examples of possibly used terminal insulation materials or corresponding silicones are from the manufacturer Wacker Chemie AG, Kunststoff, silicones with the designation ELASTOSIL A 234 or ELASTOSIL RT 772.
  • the first silicone has an RTI value of 150 and is in the fire protection class HB.
  • the second silicone even has an RTI value of 200 and is in the same fire protection class.
  • Dow Corning Corporation USA, has a 3120 silicone which has an RTI of 220 and is also in fire safety class HB.
  • the first and the third said silicone material is in liquid form, the second silicone material is pasty. All silicones can be on , ,

Abstract

A tubular heater has a tubular casing and a heating conductor running in the tubular casing, wherein insulating material is provided between the heating conductor and the tubular casing. The heating conductor is provided with an electrical connection in a connecting section of the tubular heater, wherein, in this case, the insulating material is mixed with specialty silicone with an RTI value of at least 150, advantageously at least 200. The silicone generally prevents the ingress of water and moisture, and the specialty silicone with the high RTI value is highly temperature-resistant.

Description

Beschreibung  description
Rohrheizkörper und Verfahren zur Herstellung eines solchen Rohrheizkörpers  Tubular heater and method for producing such a tubular heater
Anwendungsgebiet und Stand der Technik Field of application and state of the art
Die Erfindung betrifft einen Rohrheizkörper sowie ein Verfahren zur Herstellung eines solchen Rohrheizkörpers. The invention relates to a tubular heater and a method for producing such a tubular heater.
Aus der DE 1083450 ist der grundsätzliche Aufbau eines solchen Rohrheizkörpers bekannt. In einem Metallrohr als Mantel verläuft ein üblicherweise gewendelter Heizdraht. Durch ein Auffüllen des Mantels mit kornförmigem Isoliermaterial, insbesondere Magnesiumoxyd, wird der Heizdraht gegen den Mantel isoliert. An einem Anschlussende des Rohrheizkörpers wird der Heizdraht mit einem Anschlussstift verbunden bzw. auf diesen aufgeschoben, wobei der Anschlussstift zentrisch zum Mantel verläuft und aus diesem herausragt. Der Anschlussstift ist durch einen Isolierkörper aus Kunststoff oder Keramik gegen den Mantel isoliert und wird dadurch auch in seiner Lage fixiert. From DE 1083450 the basic structure of such a tubular heater is known. In a metal tube as a jacket runs a commonly coiled heating wire. By filling the jacket with granular insulating material, in particular magnesium oxide, the heating wire is insulated against the jacket. At a terminal end of the tubular heater of the heating wire is connected to a pin or pushed onto this, the pin extends centrally to the shell and protrudes from this. The pin is isolated by an insulating plastic or ceramic against the jacket and is thus fixed in its position.
Derartige Rohrheizkörper werden beispielsweise in Elektrowärmegeräten wie Backöfen häufig verwendet zu deren Beheizung. Bei Backöfen geht jedoch die Entwicklung in die Richtung, dass einerseits höhere Betriebstemperaturen, insbesondere für eine Reinigung der Backofenmuffel mittels Pyrolyse, und andererseits aus Gründen der Energieeffizienz immer dickere Wärmedämmungen eingesetzt werden. Diese Entwicklung führt dazu, dass die Temperaturen im Anschlussbereich eines Rohrheizkörpers immer weiter steigen. Zwar könnte, um diesem Problem zu begegnen, die unbeheizte Länge des Rohrheizkörpers vergrößert werden. Da jedoch der Platz im Inneren des Backofens sehr begrenzt ist und eine bestimmte Leistung gefordert wird, geht dies in der Regel nicht. - - Such tubular heaters are often used for example in electric heaters such as ovens to heat them. In the case of ovens, however, the trend is towards increasingly high operating temperatures, in particular for pyrolysis of the oven muffle, and, for reasons of energy efficiency, increasingly thicker thermal insulations. This development means that the temperatures in the connection area of a tubular heater continue to rise. Although, to counteract this problem, the unheated length of the tubular heater could be increased. However, since the space inside the oven is very limited and a certain power is required, this is usually not. - -
Aufgabe und Lösung Task and solution
Der Erfindung liegt die Aufgabe zugrunde, einen eingangs genannten Rohrheizkörper sowie ein Verfahren zu seiner Herstellung zu schaffen, mit denen Probleme des Standes der Technik vermieden werden können und die vor allem höhere Temperaturen im Anschlussbereich bzw. am Anschlussabschnitt eines Rohrheizkörpers ermöglichen. The invention has for its object to provide a tubular heater mentioned above and a method for its production, which can be avoided with the problems of the prior art and especially allow higher temperatures in the connection area or at the connection section of a tubular heater.
Gelöst wird diese Aufgabe durch einen Rohrheizkörper mit den Merkmalen des Anspruchs 1 sowie ein Verfahren zu seiner Herstellung mit den Merkmalen des Anspruchs 7. Vorteilhafte sowie bevorzugte Ausgestaltungen der Erfindung sind Gegenstand der weiteren Ansprüche und werden im Folgenden näher erläutert. Der Wortlaut der Ansprüche wird dabei durch ausdrückliche Bezugnahme zum Inhalt der Beschreibung gemacht. Manche der nachfolgend genannten Merkmale werden nur für den Rohrheizkörper oder nur für das Herstellungsverfahren genannt. Sie sollen jedoch unabhängig davon sowohl für den Rohrheizkörper als auch für das Herstellungsverfahren gelten können. This object is achieved by a tubular heater with the features of claim 1 and a method for its preparation with the features of claim 7. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. The wording of the claims is made explicit reference to the content of the description. Some of the features mentioned below are only mentioned for the tubular heater or only for the manufacturing process. However, you should be able to apply regardless of both the tubular heater and the manufacturing process.
Es ist vorgesehen, dass der Rohrheizkörper einen Rohrmantel und mindestens einen in dem Rohrmantel verlaufenden Heizleiter aufweist, wobei dazwischen Isoliermaterial vorgesehen ist, üblicherweise Magnesiumoxyd odgl.. Der Heizleiter ist in einem Anschlussabschnitt des Rohrheizkörpers mit einem elektrischen Anschluss versehen, beispielsweise in einfacher Steckerform. Erfindungsgemäß ist im Bereich des Anschlussabschnitts das Isoliermaterial mit Silikon vermischt bzw. enthält Silikon, um das Eindringen von Wasser bzw. Feuchtigkeit in den Rohrmantel bzw. in den Rohrheizkörper zu verhindern. Das Silikon weist einen RTI-Wert von mindestens 150 auf. Vorteilhaft weist das Silikon einen RTI-Wert von mindestens 200 auf, besonders vorteilhaft sogar mindestens 220. Der RTI-Wert (Relative Temperature Index) ist ein Maß für die thermische Alterungsbeständigkeit gemäß UL, welcher sozusa- - - gen die US-amerikanische VDE ist. Üblicherweise verwendete Verschlussqualitäten von Silikon für elektrische Rohrheizkörper haben einen RTI -Wert von maximal 105. It is envisaged that the tubular heater has a tubular jacket and at least one heating conductor extending in the tubular jacket, wherein insulating material is provided therebetween, usually magnesium oxide or the like. The heating conductor is provided in an attachment section of the tubular heater with an electrical connection, for example in a simple plug form. According to the invention, the insulating material is mixed with silicone in the area of the connection section or contains silicone in order to prevent the penetration of water or moisture into the pipe jacket or into the pipe heater. The silicone has an RTI value of at least 150. Advantageously, the silicone has an RTI value of at least 200, particularly advantageously at least 220. The RTI value (Relative Temperature Index) is a measure of the thermal aging resistance according to UL, which is as it were. - - the US VDE is. Normally used sealing qualities of silicone for electric tubular heaters have a maximum RTI value of 105.
So werden eben auch höhere Temperaturen im Anschlussabschnitt des Rohrheizkörpers ermöglicht, ohne dass die elektrische Isolierung bzw. die Funktionsfähigkeit und Sicherheit des Rohrheizkörpers in Mitleidenschaft gezogen werden bei gleichzeitigem Schutz gegen Eindringen von Wasser bzw. Feuchtigkeit in den Rohrheizkörper. Alternative Materialien wie in der Verarbeitung sehr aufwendiges Teflon oder das in der DE 41 22 657 A1 beschriebene PPS als hochtemperaturbeständiges Thermoplast sind erheblich aufwendig und teurer und können somit vermieden werden. Es geht also erfindungsgemäß nicht nur darum, Silikon an sich zusammen mit dem Isoliermaterial zu verwenden bzw. zu vermischen, sondern um die Verwendung von bestimmten Silikonqualitäten mit einem genannten hohen RTI-Wert. So just higher temperatures in the connection section of the tubular heater are made possible without the electrical insulation and the functionality and safety of the tubular heater are affected while protecting against ingress of water or moisture in the tubular heater. Alternative materials such as Teflon which is very expensive to process or the PPS described in DE 41 22 657 A1 as a high-temperature-resistant thermoplastic are considerably complicated and expensive and can thus be avoided. Thus, according to the invention, it is not only a matter of using or mixing silicone per se together with the insulating material, but of using certain silicone qualities with a stated high RTI value.
Ein weiterer Vorteil der Verwendung von Silikon mit einem solchen hohen RTI-Wert liegt darin, dass bislang verwendete Polymere bzw. Sili- konvernetzer für Silikone aus dem Niedrig-Temperaturbereich auch weiterhin verwendet werden können. A further advantage of the use of silicone with such a high RTI value is that hitherto used polymers or silicone crosslinkers for silicones from the low-temperature range can continue to be used.
Das Silikon kann in Form eines Öles oder Harzes vorliegen und dann in den Rohrheizkörper eingebracht werden, um das Isoliermaterial in dem vordersten Bereich bzw. dem Anschlussabschnitt zu durchtränken oder zu benetzen bzw. zu umhüllen. Es kann in Polymer-Form vorliegen. Es kann einige mm weit in den Rohrheizkörper eindringen, sollte aber nicht zu weit eindringen, da ansonsten die Betriebstemperatur des Rohrheizkörpers zu hoch wird für das Silikon, selbst bei hohem RTI-Wert. So kann es vorteilhaft maximal 10mm tief eingebracht sein bzw. eindringen. - - The silicone may be in the form of an oil or resin and then introduced into the tubular heater to impregnate or coat the insulating material in the foremost region. It can be in polymer form. It may penetrate a few mm into the tubular heater, but should not penetrate too far, otherwise the operating temperature of the tubular heater is too high for the silicone, even at high RTI value. So it can be beneficial introduced or penetrate maximally 10mm deep. - -
Des weiteren kann vorteilhaft ein solches Silikon bzgl. der Brennbarkeit derart ausgebildet sein, dass es mindestens Brandschutzklasse HB aufweist, besonders vorteilhaft sogar V-0. Furthermore, such a silicone can advantageously be designed with respect to combustibility such that it has at least fire protection class HB, particularly advantageously even V-0.
In nochmals weiterer Ausgestaltung der Erfindung kann ein Silikonver- netzer vorgesehen sein bzw. er kann beigemengt werden. In a further embodiment of the invention, a silicone crosslinker can be provided or it can be added.
Zur Herstellung des erfindungsgemäßen Rohrheizkörpers wird wie üblich das normale Isoliermaterial zwischen Heizleiter und Rohrmantel eingebracht und dann im Anschlussabschnitt eben das spezielle Silikon. Dieses kann während bzw. nach dem Einbringen verfestigt bzw. ausgehärtet oder gebunden werden. Anschließend kann eine übliche Isolierperle am Rohrmantel befestigt werden als Abschluss des Rohrheizkörpers, möglicherweise noch mit einer üblichen Dichtmasse dazwischen. To produce the tubular heater according to the invention, as usual, the normal insulating material is introduced between the heating conductor and the tube jacket and then in the connection section just the special silicone. This can be solidified or cured or bonded during or after the introduction. Subsequently, a conventional insulating bead can be attached to the pipe jacket as a conclusion of the tubular heater, possibly even with a conventional sealant in between.
Diese und weitere Merkmale gehen außer aus den Ansprüchen auch aus der Beschreibung und der Zeichnung hervor, wobei die einzelnen Merkmale jeweils für sich allein oder zu mehreren in Form von Unterkombination bei einer Ausführungsform der Erfindung und auf anderen Gebieten verwirklicht sein und vorteilhafte sowie für sich schutzfähige Ausführungen darstellen können, für die hier Schutz beansprucht wird. Die Unterteilung der Anmeldung in einzelne Abschnitte sowie Zwischenüberschriften beschränken die unter diesen gemachten Aussagen nicht in ihrer Allgemeingültigkeit. These and other features will become apparent from the claims and from the description and the drawings, wherein the individual features each alone or more in the form of sub-combination in one embodiment of the invention and in other areas be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections and subheadings does not limit the statements made thereunder in their generality.
Detaillierte Beschreibung der Ausführungsbeispiele Detailed description of the embodiments
In der Zeichnung ist in Fig. 1 ein Schnitt durch einen erfindungsgemäßen Rohrheizkörper dargestellt. Der Rohrheizkörper 1 1 weist einen Rohrmantel 13 auf, in dem ein gewendelter Heizleiter 15 entlang der strichpunktiert dargestellten Mittellängsachse verläuft. Rohrmantel 13 und Heizleiter 15 sind vorteilhaft ausgebildet wie aus dem Stand der - - In the drawing, a section through a tubular heater according to the invention is shown in Fig. 1. The tubular heater 1 1 has a tube jacket 13, in which a coiled heating conductor 15 extends along the dash-dotted center longitudinal axis. Pipe jacket 13 and heating element 15 are advantageously formed as from the prior - -
Technik bekannt. Ein Zwischenraum 17 zwischen dem Heizleiter 15 und dem Rohrmantel 13 ist mit einem Isoliermaterial 18 gefüllt. Dieses Isoliermaterial kann wie vorbeschrieben Magnesiumoxyd in pulveriger bzw. körniger Form sein und beispielsweise auch verdichtet sein in dem Rohrmantel 13. So ist der Rohrheizkörper 1 1 stabil und der Heizleiter 15 kann auf keinen Fall in Kontakt mit dem Rohrmantel 13 kommen. Technique known. An intermediate space 17 between the heating conductor 15 and the tube jacket 13 is filled with an insulating material 18. As described above, this insulating material may be in pulverulent or granular form and, for example, also be compressed in the tube jacket 13. Thus, the tubular heater 1 1 is stable and the heating conductor 15 can by no means come into contact with the tube jacket 13.
Der linke Bereich des Rohrheizkörpers 1 1 bildet einen Anschlussabschnitt 20, und zwar dort, wo der Rohrmantel 13 ein Ende 21 aufweist, welches nach links offen ist. In dieses Ende 21 ist eine ebenfalls an sich bekannte Isolierperle 23 eingebracht, vorteilhaft aus Kunststoff oder Keramikmaterial. Sie kann mit einer zusätzlichen Dichtmasse 24 befestigt bzw. verklebt sein und zentrisch in dem Rohrmantel 13 gehalten werden. The left portion of the tubular heater 1 1 forms a connection portion 20, specifically where the tube shell 13 has an end 21 which is open to the left. In this end 21 a likewise known per se Isolierperle 23 is introduced, advantageously made of plastic or ceramic material. It can be fixed or glued with an additional sealing compound 24 and be held centrally in the tube shell 13.
Durch eine zentrische Bohrung der Isolierperle 23 läuft ein Anschlussbolzen 25, vorzugsweise ein Metallstift. An seinem linken aus dem Rohrmantel 13 stehenden Ende kann ein an sich bekannter elektrischer An- schluss vorgesehen sein. An seinem rechten, in den Rohrmantel 13 hinein weisenden Ende weist er einen verjüngten Verbindungsbereich 26 auf, an dem der Heizleiter 15 auf grundsätzlich bekannte Art und Weise kontaktiert und befestigt ist. Auch der Anschlussabschnitt 20 mit Isolierperle 23 und Anschlussbolzen 25 entspricht weitgehend dem Stand der Technik. Through a central bore of the insulating bead 23 runs a connecting bolt 25, preferably a metal pin. On its left end, which is located on the tube jacket 13, an electrical connection known per se can be provided. At its right, in the tube shell 13 in the end pointing, it has a tapered connection portion 26 to which the heating element 15 is contacted and fixed in a basically known manner. Also, the connection portion 20 with Isolierperle 23 and terminal pin 25 largely corresponds to the prior art.
Im rechten Bereich des Rohrheizkörpers 1 1 in Fig. 1 ist das schräg nach rechts oben gestrichelt dargestellte Isoliermaterial 18 vorhanden. Das Isoliermaterial 18 erstreckt sich bis zu der Dichtmasse 24. In dem daneben angrenzenden Bereich ist dem Isoliermaterial 18 erfindungsgemäß das neuartige Silikon beigemischt, so dass ein Mischbereich 28 entsteht, der schräg nach links oben gestrichelt dargestellt ist. Dieses Silikon für den Mischbereich 28 ist wie vorbeschrieben ausgebildet, ist also ein ein- - - gangs genanntes Silikon-Material und kann flüssig oder pastös sein. So kann es durch das offene Ende 21 des Rohrmantels 13 eingefüllt werden um sich mit dem körnigen Isoliermaterial 18 zu vermischen und, falls notwendig, ausgehärtet werden. In the right area of the tubular heater 1 1 in Fig. 1, the dashed lines to the top right illustrated insulating material 18 is present. The insulating material 18 extends up to the sealing compound 24. In the adjoining region, the insulating material 18 according to the invention, the novel silicone mixed, so that a mixing region 28 is formed, which is shown diagonally dashed left above. This silicone for the mixing area 28 is designed as described above, so it is a - called gangs silicone material and may be liquid or pasty. Thus it can be filled through the open end 21 of the tubular jacket 13 to mix with the granular insulating material 18 and, if necessary, cured.
Im hier dargestellten Ausführungsbeispiel erstreckt sich der Mischbereich 28 mit dem Silikon von der Dichtmasse 24 weg nach rechts in den Rohrmantel 13 hinein. Wird die Dichtmasse 24 weggelassen, kann der Mischbereich 28 mit dem Silikon auch direkt an die Isolierperle 23 anschließen. Des weiteren erstreckt sich der Mischbereich 28 nach rechts bis kurz vor die Verbindung des Anschlussbolzens 25 an den Heizleiter 15 bzw. den Verbindungsbereich 26. Dies muss aber nicht unbedingt so sein. Der Übergang zwischen dem Mischbereich 28 und dem Bereich mit dem Isoliermaterial 18 ohne Silikon rechts daneben ist sehr abrupt bzw. schlagartig, nämlich als Linie bzw. als Grenzschicht 29. Die Länge des Mischbereichs 28 kann einige mm betragen, beispielsweise 10mm bis 20mm oder sogar 40mm In the exemplary embodiment illustrated here, the mixing region 28 with the silicone extends from the sealant 24 to the right into the tube jacket 13. If the sealing compound 24 is omitted, the mixing area 28 with the silicone can also be connected directly to the insulating bead 23. Furthermore, the mixing region 28 extends to the right until just before the connection of the connecting bolt 25 to the heating conductor 15 or the connecting region 26. However, this does not necessarily have to be the case. The transition between the mixing region 28 and the region with the insulating material 18 without silicone right next to it is very abrupt or abrupt, namely as a line or as a boundary layer 29. The length of the mixing region 28 may be a few mm, for example 10mm to 20mm or even 40mm
Beispiele für möglicherweise verwendete Anschluss-Isoliermaterialien bzw. entsprechende Silikone sind vom Hersteller Wacker Chemie AG, München, Silikone mit der Bezeichnung ELASTOSIL A 234 oder ELASTOSIL RT 772. Das erste Silikon weist einen RTI-Wert von 150 auf und ist in der Brandschutzklasse HB. Das zweite Silikon weist sogar einen RTI-Wert von 200 auf und ist in derselben Brandschutzklasse. Examples of possibly used terminal insulation materials or corresponding silicones are from the manufacturer Wacker Chemie AG, Munich, silicones with the designation ELASTOSIL A 234 or ELASTOSIL RT 772. The first silicone has an RTI value of 150 and is in the fire protection class HB. The second silicone even has an RTI value of 200 and is in the same fire protection class.
Des weiteren gibt es von der Firma Dow Corning Corporation, USA, ein Silikon 3120, welches einen RTI-Wert von 220 aufweist und ebenfalls in der Brandschutzklasse HB ist. In addition, Dow Corning Corporation, USA, has a 3120 silicone which has an RTI of 220 and is also in fire safety class HB.
Das erste und das dritte genannte Silikonmaterial liegt in flüssiger Form vor, das zweite Silikonmaterial ist pastös. Alle Silikone können auf an . . The first and the third said silicone material is in liquid form, the second silicone material is pasty. All silicones can be on , ,
sich bekannte Art und Weise in den Rohrmantel 13 und in das Isoliermaterial eingebracht werden und dann gehärtet bzw. gebunden werden. Known manner be introduced into the tube jacket 13 and in the insulating material and then cured or bonded.

Claims

Patentansprüche claims
1. Rohrheizkörper mit einem Rohrmantel und einem in dem Rohrmantel verlaufenden Heizleiter, wobei zwischen Heizleiter und Rohrmantel Isoliermaterial vorgesehen ist und der Heizleiter in einem Anschlussabschnitt des Rohrheizkörpers einen elektrischen Anschluss aufweist, dadurch gekennzeichnet, dass im Bereich des Anschlussabschnitts das Isoliermaterial mit Silikon vermischt ist bzw. Silikon enthält zur Verhinderung des Eindringens von Wasser bzw. Feuchtigkeit in den Rohrmantel bzw. in den Rohrheizkörper, wobei das Silikon einen RTI-Wert von mindestens 150 aufweist. 1. tubular heater with a tube jacket and extending in the tubular jacket heating conductor, wherein between heating element and pipe jacket insulating material is provided and the heating element in a connection portion of the tubular heater has an electrical connection, characterized in that in the region of the connection portion, the insulating material is mixed with silicone or Silicone contains water or moisture to prevent penetration of the pipe jacket or tubular heater, with the silicone having an RTI value of at least 150.
2. Rohrheizkörper nach Anspruch 1 , dadurch gekennzeichnet, dass das Silikon für den Anschlussabschnitt einen RTI-Wert von mindestens 200 aufweist, insbesondere mindestens 220. 2. Tubular heater according to claim 1, characterized in that the silicone for the connection section has an RTI value of at least 200, in particular at least 220th
3. Rohrheizkörper nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Silikon in Form eines Harzes oder Öles vorliegt vor dem Vermischen mit dem Isoliermaterial. 3. Tubular heater according to claim 1 or 2, characterized in that the silicone in the form of a resin or oil is present before mixing with the insulating material.
4. Rohrheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Silikon in Polymer-Form vorliegt. 4. Tubular heater according to one of the preceding claims, characterized in that the silicone is in polymer form.
5. Rohrheizkörper nach Anspruch 4, dadurch gekennzeichnet, dass das Polymer einen Vernetzer aufweist. 5. Tubular heater according to claim 4, characterized in that the polymer has a crosslinker.
6. Rohrheizkörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Brennbarkeit des verwendeten Silikons mindestens Brandschutzklasse HB aufweist, vorzugsweise mindestens V-0. Verfahren zur Herstellung eines Rohrheizkörpers nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass übliches Isoliermaterial zwischen Heizleiter und Rohrmantel eingebracht und dann im Anschlussabschnitt ein Silikon mit einem RTI- Wert von mindestens 150 eingebracht wird zur Vermischung mit dem Isoliermaterial, wobei das Silikon während bzw. nach dem Einbringen verfestigt bzw. ausgehärtet oder gebunden wird. 6. Tubular heater according to one of the preceding claims, characterized in that the combustibility of the silicone used has at least fire protection class HB, preferably at least V-0. Method for producing a tubular heater according to one of the preceding claims, characterized in that common insulating material is introduced between the heating conductor and the tube jacket and then in the connection section a silicone with an RTI value of at least 150 is introduced for mixing with the insulating material, wherein the silicone during or solidified after hardening or hardened or bound.
Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das eingebrachte Silikon nur wenige mm tief in den Anschlussabschnitt eingebracht wird bzw. eindringt, vorzugsweise maximal 3mm bis 10mm tief. A method according to claim 7, characterized in that the introduced silicone is introduced only a few mm deep in the connection section or penetrates, preferably at most 3mm to 10mm deep.
EP10754932.1A 2009-09-25 2010-09-17 Tubular heater and method for production of such a tubular heater Revoked EP2481259B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10754932T PL2481259T3 (en) 2009-09-25 2010-09-17 Tubular heater and method for production of such a tubular heater

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009048495A DE102009048495A1 (en) 2009-09-25 2009-09-25 Tubular heater and method for producing such a tubular heater
PCT/EP2010/063728 WO2011036105A1 (en) 2009-09-25 2010-09-17 Tubular heater and method for production of such a tubular heater

Publications (2)

Publication Number Publication Date
EP2481259A1 true EP2481259A1 (en) 2012-08-01
EP2481259B1 EP2481259B1 (en) 2015-07-01

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EP10754932.1A Revoked EP2481259B1 (en) 2009-09-25 2010-09-17 Tubular heater and method for production of such a tubular heater

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EP (1) EP2481259B1 (en)
DE (1) DE102009048495A1 (en)
ES (1) ES2546510T3 (en)
PL (1) PL2481259T3 (en)
WO (1) WO2011036105A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015102728A1 (en) 2015-02-25 2016-08-25 Eltra Heizelemente Gmbh Electric tubular heater and method for producing the electric tubular heater
DE102015212916A1 (en) 2015-07-09 2017-01-12 E.G.O. Elektro-Gerätebau GmbH hob

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE556965A (en) 1956-04-25
DE4122657A1 (en) 1991-07-09 1993-01-14 Licentia Gmbh Moisture-resistant seal for sheathed electric heaters - by bonding or mfr. of plugs from heat-resistant thermoplastics
FR2754128B1 (en) 1996-09-27 1998-12-04 Vulcanic ELECTRIC HEATING DEVICE, MANUFACTURING METHOD, AND RADIATOR THUS EQUIPPED
IT1294562B1 (en) 1997-02-07 1999-04-12 I R C A Spa Ind Resistenze Cor ARMORED RESISTANCE AND RESISTANCE OBTAINED PROCEDURE.
FR2830163B1 (en) 2001-09-21 2004-08-27 Seb Sa METHOD FOR MANUFACTURING HEATING ELEMENTS

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DOW CORNING CORP: "QMFZ2.E40195 PLASTICS - COMPONENT", UL ONLINE CERTIFICATION DIRECTORY, 1 January 2015 (2015-01-01), pages 1 - 7, XP003035530, Retrieved from the Internet <URL:HTTP://DATABASE.UL.COM/CGI-BIN/XYV/TEMPLATE/LISEXT/1FRAME/SHOWPAGE.HTML?NAME=QMFZ2.E40195&CCNSHORTTITLE=PLASTICS+-+COMPONENT&OBJID=1073828195&CFGID=1073741824&VERSION=VERSIONLESS&PARENT_ID=1073827222&SEQUENCE=1>
See also references of WO2011036105A1

Also Published As

Publication number Publication date
DE102009048495A1 (en) 2011-04-07
WO2011036105A1 (en) 2011-03-31
PL2481259T3 (en) 2015-12-31
EP2481259B1 (en) 2015-07-01
ES2546510T3 (en) 2015-09-24

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