EP1296539B1 - Method of producing heating elements - Google Patents
Method of producing heating elements Download PDFInfo
- Publication number
- EP1296539B1 EP1296539B1 EP02356172A EP02356172A EP1296539B1 EP 1296539 B1 EP1296539 B1 EP 1296539B1 EP 02356172 A EP02356172 A EP 02356172A EP 02356172 A EP02356172 A EP 02356172A EP 1296539 B1 EP1296539 B1 EP 1296539B1
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- EP
- European Patent Office
- Prior art keywords
- tube
- resin
- magnesia
- manufacturing
- heater element
- 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
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- 238000000034 method Methods 0.000 title claims description 15
- 238000010438 heat treatment Methods 0.000 title abstract description 34
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000011347 resin Substances 0.000 claims abstract description 59
- 229920005989 resin Polymers 0.000 claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 claims abstract description 32
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 31
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 14
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 238000007493 shaping process Methods 0.000 claims abstract description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 12
- 238000000137 annealing Methods 0.000 claims description 9
- -1 methylphenylsiloxane Chemical class 0.000 claims description 3
- 238000010304 firing Methods 0.000 abstract 3
- 238000007789 sealing Methods 0.000 description 8
- 239000012071 phase Substances 0.000 description 7
- 239000011324 bead Substances 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
- 238000005470 impregnation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000000151 deposition Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000002788 crimping Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000000379 polymerizing effect Effects 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical compound CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000000080 chela (arthropods) Anatomy 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 229920001195 polyisoprene Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- 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
- H05B3/52—Apparatus or processes for filling or compressing insulating material in tubes
-
- 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 the field of heating elements able to equip household electrical appliances and more particularly to their manufacturing.
- the heating elements covered by the present invention are commonly called “shielded” heating elements, their structure having a metal tube inside which is housed a resistant wire surrounded by magnesia.
- the load of these elements is quite important, since it can exceed 30 W / cm 2 .
- Such elements are common in household appliances heating kettle type, home appliances, grills, ...
- the present invention is aimed in particular at heating elements whose tube is metallic. Although many manufacturing processes exist for the realization of such elements, they all have in common the realization of the metal tube, filling said tube with a strong wire and the magnesia, then the passage in an annealing furnace. They are then formatted before capping operations.
- magnesia being very hydrophilic, as long as it is not dehydrated and then isolated from the external environment, stages of desiccation is necessary.
- the resin introduced after the setting form of resistance, ensures the sealing of the bead and the sealing of the resistance. It must fill the entire space between magnesia and pearl This translates, in practice, into a necessary overdose of resin that overflows when the ceramic bead is put in place, so to ensure that the resin is in good contact with said bead. Such overflows can lead to manufacturing waste, or even malfunctions of the completed heating elements.
- DE 24 10 451 shows such an embodiment where the Clogging of the heating element is ensured by an elastic sleeve binding with magnesia via a polydimethylsiloxane-type sealing liquid.
- the present invention aims to reduce the time required for manufacture heating elements as previously described. This reduction in manufacturing time leads to a reduction in production costs.
- the present invention is achieved using a manufacturing process heating element from a straight metal tube, said method comprising the steps of setting up a set consisting of a wire two connection terminals inside said tube, the two terminals terminating at each end of said tube, the latter being filled with magnesia, these steps being followed by a compacting operation followed by annealed at high temperature in an oven, following this annealing step, during the cooling phase of the tube, a step of plugging at least one end of the tube with a resin contact with magnesia, characterized in that the polymerization of the resin is incomplete and leaves the resin in an intermediate gel step, prior to any shaping of said tube, said resin being polymerized subsequently, after the manufacturing process.
- This gel state for a sufficiently long time after their release from the oven is not a natural state of resins. Most of them, indeed, polymerize rapidly and subsequent shaping of the resistance, which it is a forming, a stretching or a calibration resulting in the breakage of the end of said resistance. It may therefore seem unacceptable to want plug the heating elements with a resin before shaping for obvious reasons of breakage at the level of said resin as soon as forming step: bending, stretching, U-shaped forming, ... is implemented.
- the resin used is a resin of the type methylphenylsiloxane, which has, besides good sealing properties, a fairly simple implementation, the hardening curve can be adjusted by a catalyst. Moreover, it can polymerize in layers thick without bubble formation during polymerization.
- the temperature of polymerization is between 160 and 220 ° C.
- the polymerization time is between 5 and 15 min.
- the present invention is also characterized in that the manufacturing process comprises, after capping at least one ends of the tube, a step of closing said end by a flexible silicone sleeve self-tightening on the terminal bound to the resistant wire, said end of the tube is then narrowed on the flexible sleeve to ensure sealing the projections of said closure.
- This sealing step is necessary for optimum operation heating elements and has the advantage of a purely mechanical sleeve in the tube. Its automated implementation is thus easier.
- a solution that can be automated relatively easily is all the more interesting as the phase of capping magnesia can be also, as previously described.
- the present invention also relates to a heating element comprising a metal tube inside which is housed a set composed of a wire resistant, surrounded by magnesia, and two connection terminals leading to each end of the element, the tube being blocked, at least one of its ends, by a polymerized sealing resin, in contact with the magnesia, characterized in that it comprises, at said end, a sleeve flexible silicone closure, threaded on the terminals, said end of the tube being mechanically shrinking on said sleeve.
- capping resin and flexible sleeve shutter mechanically held by the tube guarantees the watertightness and the passage normative of the heating elements thus constituted, while presenting a long life and solidity.
- the flexible silicone sleeve is self-tightening on the connecting terminal, which simplifies the manufacturing procedure in facilitating the automation of its removal, while making the final product more reliable guaranteeing the tightness at the connection between the terminal and the sleeve flexible.
- a space is provided between the sleeve and the resin.
- This area free of material between the sleeve and the resin makes it possible to overcome dimensional deviations related in particular to the tolerances of the different components and to the mechanical rolling and straightening of the heating elements, either during their production cycle or later, when using them.
- This space is variable between 0 and 2 mm and will preferably be at least 1 mm.
- Another aspect of the present invention is also an element heater comprising a stainless steel tube inside which is housed a set consisting of a strong wire, surrounded by magnesia, and two terminals of connection opening at both ends of the tube, at least one of ends of said tube being closed, vis-à-vis the outside, by a sleeve silicone, characterized in that it comprises a single capping resin and impregnation of magnesia, said resin being of type methylphenylsiloxane.
- Impregnation and capping of magnesia by a single resin reduces manufacturing costs while ensuring quality increased clogging by avoiding multiple components.
- FIG. 1 showing, in section, a completed heating element, ready to be mounted in a subset heating.
- step of setting up the resistant wire and the terminals may have variants, both terminals may or may not already be soldered on the wire before introduction into the tube.
- the present invention covers also the cases where the resistant wire is introduced into the tube and where at least one of the terminals is soldered after this operation.
- the polymerization time very short compared to more classical, is due to the incomplete transformation of the resin. This transformation is completed, ie over time (approximately one year) if the element heating is not used, very quickly (a few tens of minutes) as soon as the heating element is first used, since it is then worn at high temperature.
- the present invention is not limited to stainless steel tubes, but relates to also all metal tubes.
Landscapes
- Resistance Heating (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
La présente invention se rapporte au domaine des éléments chauffants pouvant équiper des appareils électroménagers et plus particulièrement à leur fabrication.The present invention relates to the field of heating elements able to equip household electrical appliances and more particularly to their manufacturing.
Les éléments chauffants visés par la présente invention sont communément appelés éléments chauffants "blindés", leur structure présentant un tube métallique à l'intérieur duquel est logé un fil résistant entouré de magnésie. La charge de ces éléments est assez importante, puisqu'elle peut dépasser 30 W/cm2. De tels éléments sont fréquents dans les appareils électroménagers de chauffage de type bouilloire, fours électroménagers, grills,...The heating elements covered by the present invention are commonly called "shielded" heating elements, their structure having a metal tube inside which is housed a resistant wire surrounded by magnesia. The load of these elements is quite important, since it can exceed 30 W / cm 2 . Such elements are common in household appliances heating kettle type, home appliances, grills, ...
La présente invention vise en particulier les éléments chauffants dont le tube est métallique. Bien que de nombreux procédés de fabrication existent pour la réalisation de tels éléments, ils ont tous en commun la réalisation du tube métallique, le remplissage dudit tube avec un fil résistant et de la magnésie, puis le passage dans un four de recuit. Ils sont ensuite mis en forme avant les opérations de bouchage.The present invention is aimed in particular at heating elements whose tube is metallic. Although many manufacturing processes exist for the realization of such elements, they all have in common the realization of the metal tube, filling said tube with a strong wire and the magnesia, then the passage in an annealing furnace. They are then formatted before capping operations.
Un tel procédé peut ainsi se décomposer par les étapes suivantes :
- fabrication du tube,
- introduction de l'ensemble composé du fil résistant et des bornes de connexion, puis remplissage de magnésie,
- compression de l'ensemble,
- recuit de l'ensemble pour enlever l'humidité de la magnésie,
- si nécessaire : mise à longueur exacte du tube et redressage,
- formage du tube selon l'appareil destinataire (forme arquée,...)
- étuvage dans un four (car la magnésie a repris de l'humidité), pendant 60 à 90 min,
- imprégnation de résine aux extrémités de la résistance,
- pose manuelle des perles céramiques de bouchage aux extrémités,
- polymérisation de la résine, pendant 90 min,
- opération de formage final à la presse.
Un des inconvénients majeurs d'un tel procédé est, entre autres, la longueur du cycle de fabrication, notamment par les étapes thermiques et le refroidissement consécutif. Par exemple, les résistances, après leur passage dans le four de recuit, présentent une température élevée. Elles doivent donc être stockées dans une zone de refroidissement avant les étapes suivantes.Such a method can thus be broken down by the following steps:
- manufacture of the tube,
- introduction of the assembly composed of the resistant wire and the connection terminals, then filling of magnesia,
- compression of the whole,
- annealing the assembly to remove moisture from magnesia,
- if necessary: exact length of the tube and straightening,
- forming of the tube according to the recipient apparatus (arcuate form, ...)
- steaming in an oven (because the magnesia has taken up moisture), for 60 to 90 minutes,
- resin impregnation at the ends of the resistor,
- manual installation of ceramic capping beads at the ends,
- polymerization of the resin, for 90 minutes,
- final forming operation to the press.
One of the major drawbacks of such a process is, among others, the length of the manufacturing cycle, in particular by the thermal steps and the subsequent cooling. For example, the resistors, after passing through the annealing furnace, have a high temperature. They must therefore be stored in a cooling zone before the following steps.
Par ailleurs, la magnésie étant très hydrophile, tant qu'elle n'est pas déshydratée puis isolée de l'environnement extérieur, des étapes de dessiccation sont nécessaires.Moreover, magnesia being very hydrophilic, as long as it is not dehydrated and then isolated from the external environment, stages of desiccation is necessary.
Par ailleurs, dans un tel procédé, la résine, introduite après la mise en forme de la résistance, assure le scellement de la perle et l'étanchéité de la résistance. Elle doit donc remplir tout l'espace entre la magnésie et la perle céramique, ce qui se traduit, en pratique, par un nécessaire surdosage de résine qui vient déborder lorsque la perle céramique est mise en place, afin d'assurer que la résine soit bien en contact avec ladite perle. De tels débordements peuvent entraíner des rebus de fabrication, voire des dysfonctionnements des éléments chauffants achevés.Moreover, in such a process, the resin, introduced after the setting form of resistance, ensures the sealing of the bead and the sealing of the resistance. It must fill the entire space between magnesia and pearl This translates, in practice, into a necessary overdose of resin that overflows when the ceramic bead is put in place, so to ensure that the resin is in good contact with said bead. Such overflows can lead to manufacturing waste, or even malfunctions of the completed heating elements.
Le document DE 24 10 451 montre un tel exemple de réalisation où le bouchage de l'élément chauffant est assuré par un manchon élastique en liaison avec la magnésie par l'intermédiaire d'un liquide obturant de type polydiméthylsiloxane.DE 24 10 451 shows such an embodiment where the Clogging of the heating element is ensured by an elastic sleeve binding with magnesia via a polydimethylsiloxane-type sealing liquid.
La présente invention vise à réduire le temps nécessaire à la fabrication des éléments chauffants tels que précédemment décrits. Cette réduction du temps de fabrication entraíne une réduction des coûts de production.The present invention aims to reduce the time required for manufacture heating elements as previously described. This reduction in manufacturing time leads to a reduction in production costs.
Une simplification des étapes et surtout de leur nombre doit pouvoir diminuer les manutentions des éléments et le travail en temps masqué qui nécessite de la place et génère des encours importants. A simplification of the stages and especially of their number must be able reduce the handling of elements and the work in masked time which requires space and generates large amounts of money.
La présente invention est atteinte à l'aide d'un procédé de fabrication d'élément chauffant à partir d'un tube droit métallique, ledit procédé comprenant les étapes de mise en place d'un ensemble composé d'un fil résistant et de deux bornes de connexion à l'intérieur dudit tube, les deux bornes débouchant à chaque extrémité dudit tube, ce dernier étant rempli de magnésie, ces étapes étant suivies d'une opération de compactage suivie d'un recuit à haute température dans un four, à la suite de cette étape de recuit, pendant la phase de refroidissement du tube, est réalisée une étape de bouchage d'au moins l'une des extrémités du tube à l'aide d'une résine en contact avec la magnésie, caractérisé en ce que la polymérisation de la résine est incomplète et laisse la résine dans une étape intermédiaire de gel, préalablement à toute mise en forme dudit tube, ladite résine étant polymérisée par la suite, après le procédé de fabrication.The present invention is achieved using a manufacturing process heating element from a straight metal tube, said method comprising the steps of setting up a set consisting of a wire two connection terminals inside said tube, the two terminals terminating at each end of said tube, the latter being filled with magnesia, these steps being followed by a compacting operation followed by annealed at high temperature in an oven, following this annealing step, during the cooling phase of the tube, a step of plugging at least one end of the tube with a resin contact with magnesia, characterized in that the polymerization of the resin is incomplete and leaves the resin in an intermediate gel step, prior to any shaping of said tube, said resin being polymerized subsequently, after the manufacturing process.
En réalisant, immédiatement après la phase de recuit des tubes, le bouchage des éléments par une résine appropriée, la magnésie, après cette étape de dessiccation, est isolée de l'environnement extérieur et ne peut reprendre d'humidité au cours de son refroidissement. Aucun autre cycle thermique visant à éliminer la reprise d'humidité par la magnésie n'est alors nécessaire, ce qui diminue grandement au final le temps de fabrication des éléments chauffants.Realizing, immediately after the annealing phase of the tubes, the capping of the elements by a suitable resin, magnesia, after this desiccation stage, is isolated from the external environment and can not regain moisture during its cooling. No other cycle thermal energy to eliminate the absorption of moisture by magnesia is then necessary, which in the end greatly reduces the manufacturing time of heating elements.
Par ailleurs, en bouchant assez tôt dans le procédé de fabrication, et ce définitivement, les extrémités des tubes, on évite toute perte de magnésie, qui, en plus d'engendrer des pertes inutiles de matière, salissent les différentes chaínes de fabrication sur lesquelles transitent des tubes durant leur transformation.Moreover, by plugging early enough in the manufacturing process, and this definitively, the ends of the tubes, one avoids any loss of magnesia, which, in addition to generating unnecessary losses of material, dirty the different manufacturing lines in which tubes pass during their transformation.
De plus, en laissant la résine dans un état intermédiaire entre la phase liquide ou semi-liquide et la phase solide après polymérisation complète, on permet la mise en forme des éléments chauffants selon la configuration souhaitée sans risque de casser la résine polymérisée.In addition, leaving the resin in an intermediate state between the phase liquid or semi-liquid and the solid phase after complete polymerization, one allows the heating elements to be shaped according to the configuration desired without the risk of breaking the polymerized resin.
Cet état de gel pendant un temps suffisamment long après leur sortie du four n'est pas un état naturel des résines. La plupart d'entre elles, en effet, polymérisent rapidement et une mise en forme ultérieure de la résistance, que ce soit un formage, un étirage ou un calibrage a pour résultat la casse de l'extrémité de ladite résistance. Il peut donc paraítre rédhibitoire de vouloir boucher les éléments chauffants avec une résine avant toute mise en forme pour des raisons évidentes de casse au niveau de ladite résine dès qu'une étape de mise en forme : cintrage, étirage, formage en U,... est mise en oeuvre.This gel state for a sufficiently long time after their release from the oven is not a natural state of resins. Most of them, indeed, polymerize rapidly and subsequent shaping of the resistance, which it is a forming, a stretching or a calibration resulting in the breakage of the end of said resistance. It may therefore seem unacceptable to want plug the heating elements with a resin before shaping for obvious reasons of breakage at the level of said resin as soon as forming step: bending, stretching, U-shaped forming, ... is implemented.
Pourtant, après de nombreux essais en laboratoire, il s'est avéré possible de sélectionner, essentiellement par expérience, une résine qui, portée à une certaine température pendant un certain temps, présente un état de gel, permettant de cumuler, à la fois ses propriétés de bouchage du tube, puisque la résine ne flue pas hors du tube, tout en gardant temporairement une certaine souplesse lui permettant de suivre les contraintes mécaniques lors des différentes mises en forme des tubes.However, after many laboratory tests, it turned out possible to select, essentially by experiment, a resin which, brought to a certain temperature for a certain period of time, presents a state of gel, making it possible to cumulate, at the same time, its blocking properties of the tube, since the resin does not flow out of the tube, while temporarily keeping a certain flexibility allowing him to follow the mechanical constraints during different shaping of the tubes.
Certes, la polymérisation étant initiée, elle va irrémédiablement se poursuivre, mais en choisissant correctement, non seulement la résine, mais également les paramètres de polymérisation, il est possible d'obtenir rapidement un état de gel perdurant au moins pendant les étapes ultérieures de transformation du tube en élément chauffant prêt à être monté sur un sous-ensemble de chauffe.While polymerization is initiated, it will irremediably continue but choosing correctly not only the resin but also the polymerization parameters it is possible to obtain quickly a state of gel lasting at least during the subsequent stages converting the tube into a heating element ready to be mounted on a subassembly heating.
Un autre avantage dans le déroulement de ce procédé par rapport à l'art antérieur réside dans le fait que la résine déposée ne sert plus à assurer, à la fois le bouchage et le scellement de la perle d'extrémité mais est uniquement utilisée pour sa fonction d'imprégnation et de bouchage de la magnésie. Dès lors, un dépôt volumétrique de résine est tout à fait envisageable, ce qui rend l'opération de dépôt de résine et de polymérisation facilement automatisable.Another advantage in the progress of this process compared to the art prior art is that the deposited resin is no longer used to ensure both capping and sealing the end bead but is only used for its function of impregnation and clogging of magnesia. from then, a volumetric deposit of resin is quite conceivable, which makes the resin deposition and polymerization operation easily automatable.
Selon l'invention, la résine utilisée est une résine de type méthylphénylsiloxane, qui présente, outre de bonnes propriétés d'étanchéité, une mise en oeuvre assez simple, la courbe de durcissement pouvant être ajustée par un catalyseur. Par ailleurs, elle peut polymériser en couches épaisses sans formation de bulles durant la polymérisation.According to the invention, the resin used is a resin of the type methylphenylsiloxane, which has, besides good sealing properties, a fairly simple implementation, the hardening curve can be adjusted by a catalyst. Moreover, it can polymerize in layers thick without bubble formation during polymerization.
Selon une mise en oeuvre préférée de l'invention, la température de polymérisation est comprise entre 160 et 220°C.According to a preferred embodiment of the invention, the temperature of polymerization is between 160 and 220 ° C.
Préférentiellement, le temps de polymérisation est compris entre 5 et 15 min. Preferably, the polymerization time is between 5 and 15 min.
Par ailleurs, la présente invention se caractérise également en ce que le procédé de fabrication comporte, ultérieurement au bouchage d'au moins l'une des extrémités du tube, une étape d'obturation de ladite extrémité par un manchon silicone souple auto-serrant sur la borne liée au fil résistant, ladite extrémité du tube étant ensuite rétreinte sur le manchon souple afin d'assurer l'étanchéité aux projections de ladite obturation.Moreover, the present invention is also characterized in that the manufacturing process comprises, after capping at least one ends of the tube, a step of closing said end by a flexible silicone sleeve self-tightening on the terminal bound to the resistant wire, said end of the tube is then narrowed on the flexible sleeve to ensure sealing the projections of said closure.
Cette étape d'étanchéité est nécessaire pour le fonctionnement optimum des éléments chauffants et présente l'avantage d'un maintien purement mécanique du manchon dans le tube. Sa mise en oeuvre automatisée est ainsi plus facile. Une solution pouvant être automatisée relativement facilement est d'autant plus intéressante que la phase de bouchage de la magnésie peut l'être aussi, tel que précédemment décrit.This sealing step is necessary for optimum operation heating elements and has the advantage of a purely mechanical sleeve in the tube. Its automated implementation is thus easier. A solution that can be automated relatively easily is all the more interesting as the phase of capping magnesia can be also, as previously described.
La différence principale avec les procédés de l'art antérieur est donc de boucher, par le dépôt d'une résine, les résistances droites sorties du four de recuit, et ce, avant leur mise en forme. En gardant la résine à l'état "semi polymérisée", on permet la transformation de la résistance sans détérioration du bouchage. En complément, la dépose d'un manchon, bloqué par rétreint du tube sur ledit manchon, permet l'automatisation de l'ensemble des étapes du procédé avec une excellente maítrise des différentes étapes et donc de la qualité finale des produits.The main difference with the methods of the prior art is therefore butchering, by depositing a resin, the straight resistances out of the oven of annealed, and this, before their shaping. Keeping the resin in the "semi" state polymerized ", the transformation of the resistance without deterioration is allowed clogging. In addition, the removal of a sleeve, blocked by narrowing of tube on said sleeve, allows the automation of all the steps of the process with excellent mastery of the different stages and therefore the final quality of products.
La présente invention vise également un élément chauffant comportant un tube métallique à l'intérieur duquel est logé un ensemble composé d'un fil résistant, entouré de magnésie, et de deux bornes de connexion débouchant à chaque extrémité de l'élément, le tube étant bouché, au moins à l'une de ses extrémités, par une résine d'étanchéité polymérisée, en contact avec la magnésie, caractérisé en ce qu'il comporte, à ladite extrémité, un manchon silicone souple d'obturation, enfilé sur les bornes, ladite extrémité du tube étant rétreinte mécaniquement sur ledit manchon.The present invention also relates to a heating element comprising a metal tube inside which is housed a set composed of a wire resistant, surrounded by magnesia, and two connection terminals leading to each end of the element, the tube being blocked, at least one of its ends, by a polymerized sealing resin, in contact with the magnesia, characterized in that it comprises, at said end, a sleeve flexible silicone closure, threaded on the terminals, said end of the tube being mechanically shrinking on said sleeve.
La combinaison de la résine de bouchage et du manchon souple d'obturation tenu mécaniquement par le tube garantit l'étanchéité et le passage normatif des éléments chauffants ainsi constitués, tout en présentant une longévité et une solidité importantes.The combination of capping resin and flexible sleeve shutter mechanically held by the tube guarantees the watertightness and the passage normative of the heating elements thus constituted, while presenting a long life and solidity.
Avantageusement, le manchon silicone souple est auto-serrant sur la borne de connexion, ce qui simplifie le mode opératoire de fabrication en facilitant l'automatisation de sa dépose, tout en fiabilisant le produit final en garantissant l'étanchéité au niveau de la liaison entre la borne et le manchon souple.Advantageously, the flexible silicone sleeve is self-tightening on the connecting terminal, which simplifies the manufacturing procedure in facilitating the automation of its removal, while making the final product more reliable guaranteeing the tightness at the connection between the terminal and the sleeve flexible.
Avantageusement, un espace est ménagé entre le manchon et la résine. Cette zone exempte de matière entre le manchon et la résine permet de pallier aux écarts dimensionnels liés notamment aux tolérances des différents composants ainsi qu'aux traitements mécaniques de laminage et de redressage des éléments chauffants, soit durant leur cycle de fabrication, soit ultérieurement, lors de leur utilisation. Cet espace est variable entre 0 et 2 mm et sera préférentiellement d'au moins 1 mm.Advantageously, a space is provided between the sleeve and the resin. This area free of material between the sleeve and the resin makes it possible to overcome dimensional deviations related in particular to the tolerances of the different components and to the mechanical rolling and straightening of the heating elements, either during their production cycle or later, when using them. This space is variable between 0 and 2 mm and will preferably be at least 1 mm.
Un autre aspect de la présente invention vise également un élément chauffant comportant un tube en inox à l'intérieur duquel est logé un ensemble composé d'un fil résistant, entouré de magnésie, et de deux bornes de connexion débouchant aux deux extrémités du tube, au moins l'une des extrémités dudit tube étant obturée, vis-à-vis de l'extérieur, par un manchon silicone, caractérisé en ce qu'il comporte une seule résine de bouchage et d'imprégnation de la magnésie, ladite résine étant de type méthylphénylsiloxane.Another aspect of the present invention is also an element heater comprising a stainless steel tube inside which is housed a set consisting of a strong wire, surrounded by magnesia, and two terminals of connection opening at both ends of the tube, at least one of ends of said tube being closed, vis-à-vis the outside, by a sleeve silicone, characterized in that it comprises a single capping resin and impregnation of magnesia, said resin being of type methylphenylsiloxane.
L'imprégnation et le bouchage de la magnésie par une seule résine permet de réduire les coûts de fabrication tout en garantissant une qualité accrue de bouchage en évitant plusieurs composants.Impregnation and capping of magnesia by a single resin reduces manufacturing costs while ensuring quality increased clogging by avoiding multiple components.
D'autres particularités et avantages de la présente invention apparaítront et ressortiront plus en détail à la lecture de la description suivante, détaillant un exemple non limitatif de procédé de fabrication d'élément chauffant selon la présente invention, en référence à la figure 1 annexée présentant, en coupe, un élément chauffant achevé, prêt à être monté dans un sous-ensemble chauffant.Other features and advantages of the present invention will become apparent and will appear in more detail on reading the following description, detailing a non-limiting example of a method of manufacturing a heating element according to the the present invention, with reference to the appended FIG. 1 showing, in section, a completed heating element, ready to be mounted in a subset heating.
Ainsi, un exemple de procédé de fabrication d'élément chauffant 1 selon
la présente invention peut être décrit par les étapes suivantes :
- l'étape de dépose calibrée de résine 10 à l'aide d'un pistolet
volumétrique délivrant 0,05 g ± 10% de produit. La quantité de
produit est déterminée pour que la résine imprègne la
magnésie 8 sur une distance d, tout en présentant un surplus
de résine 14 entre la magnésie 8 et l'extrémité du
tube 2 qui agit tel un bouchon. Toutefois, ce surplus n'atteint pas l'extrémité du tube. La zone d'imprégnation 12 est, dans le cas de figure présenté, voisine de 10 mm. - l'étape de polymérisation partielle de la résine à une
température de 180 °
C pendant 10 min. La résine se présente alors sous la forme d'un gel avec une croûte superficielle 11. Cette première phase de transformation de la résine est suffisante pour garantir le bouchage des tubes.
- the step of calibrated
resin deposition 10 with a volumetric gun delivering 0.05 g ± 10% product. The amount of product is determined so that the resin impregnates themagnesia 8 over a distance d, while having a surplus ofresin 14 between themagnesia 8 and the end of thetube 2 which acts as a plug. However, this surplus does not reach the end of the tube. Theimpregnation zone 12 is, in the case shown, close to 10 mm. - the step of partially polymerizing the resin at a temperature of 180 ° C for 10 min. The resin is then in the form of a gel with a
superficial crust 11. This first stage of transformation of the resin is sufficient to guarantee the clogging of the tubes.
Globalement, le procédé dure environ une heure en comparaison avec plus de 6 heures selon l'art antérieur.Overall, the process lasts about an hour in comparison with more than 6 hours according to the prior art.
Il est à noter que l'étape de mise en place du fil résistant et des bornes peut présenter des variantes, les deux bornes pouvant ou non être déjà soudées sur le fil avant l'introduction dans le tube. La présente invention couvre également les cas où le fil résistant est introduit dans le tube et où au moins l'une des bornes est soudée après cette opération.It should be noted that the step of setting up the resistant wire and the terminals may have variants, both terminals may or may not already be soldered on the wire before introduction into the tube. The present invention covers also the cases where the resistant wire is introduced into the tube and where at least one of the terminals is soldered after this operation.
Le temps de polymérisation, très court par rapport à des procédés plus classiques, est dû à la transformation incomplète de la résine. Cette transformation est achevée, soit au cours du temps (environ un an) si l'élément chauffant n'est pas utilisé, soit très rapidement (quelques dizaines de minutes) dès que l'élément chauffant est une première fois utilisé, puisque il est alors porté à haute température.The polymerization time, very short compared to more classical, is due to the incomplete transformation of the resin. This transformation is completed, ie over time (approximately one year) if the element heating is not used, very quickly (a few tens of minutes) as soon as the heating element is first used, since it is then worn at high temperature.
Ainsi, en disposant la résine dès la sortie du four de recuit, et en ne polymérisant que partiellement ladite résine, on permet de simplifier notablement les étapes du procédé de fabrication d'éléments chauffants en inox, d'où un gain de temps qui se traduit immédiatement par une baisse importante des coûts et des encours.Thus, by disposing the resin right out of the annealing furnace, and not polymerizing only partially said resin, it is possible to simplify significantly the steps of the method of manufacturing heating elements in stainless steel, which saves time and immediately reduces significant costs and outstanding amounts.
Par ailleurs, en proposant des étapes pouvant être automatisées, on diminue également les coûts de manutention tout en améliorant la qualité des éléments chauffants réalisés.Moreover, by proposing stages that can be automated, also reduces handling costs while improving the quality of heating elements made.
La présente invention n'est pas limitée aux tubes en inox, mais concerne également tous les tubes métalliques.The present invention is not limited to stainless steel tubes, but relates to also all metal tubes.
Claims (6)
- A method of manufacturing a heater element (1) from a straight metal tube (2), said method comprising the following steps: putting an assembly made up of a resistor wire (4) and of two connection terminals (6) in place inside said tube (2), the terminals (6) projecting from either end of said tube (2); filling said tube with magnesia (8); followed by compacting; followed by annealing at high temperature in an oven; followed, while the tube is cooling, by stopping at least one of the ends (18) of the tube by means of a resin (10) in contact with the magnesia (8), said method being characterized in that the polymerization of the resin (10) is incomplete and leaves the resin (10) in an intermediate gel stage, prior to any shaping of said tube (2), said resin (10) being polymerized subsequently, after the manufacturing method.
- A method of manufacturing a heater element (1) according to the preceding claim, characterized in that the resin (10) used is a resin of the methylphenylsiloxane type.
- A method of manufacturing a heater element (1) according to either preceding claim, characterized in that the polymerization temperature of the resin (10) lies in the range 160°C to 220°C.
- A method of manufacturing a heater element (1) according to any preceding claim, characterized in that the polymerization time of the resin (10) lies in the range 5 minutes to 15 minutes.
- A method manufacturing a heater element (1) according to any preceding claim, characterized in that, subsequently to stopping at least one of the ends (18) of the tube (2), the method further comprises a step of closing off said end (18) by means of a flexible silicone sleeve (20) that self-tightens onto the terminal (6) bonded to the resistor wire (4), said end (18) of the tube (2) then being shrink-fitted to the flexible sleeve (20) so that said end is closed off in leaktight manner, thereby closing it off in splash-proof manner.
- A heater element (1) for a household electrical appliance, said heater element being characterized in that it is made by means of a method according to any one of claims 1 to 5.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0112184 | 2001-09-21 | ||
FR0112184A FR2830163B1 (en) | 2001-09-21 | 2001-09-21 | METHOD FOR MANUFACTURING HEATING ELEMENTS |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1296539A1 EP1296539A1 (en) | 2003-03-26 |
EP1296539B1 true EP1296539B1 (en) | 2005-11-23 |
Family
ID=8867486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02356172A Expired - Lifetime EP1296539B1 (en) | 2001-09-21 | 2002-09-13 | Method of producing heating elements |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1296539B1 (en) |
AT (1) | ATE311085T1 (en) |
DE (1) | DE60207506T2 (en) |
ES (1) | ES2252414T3 (en) |
FR (1) | FR2830163B1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2868238B1 (en) * | 2004-03-24 | 2006-05-05 | Seb Sa | HEATING ELEMENT |
DE102009048495A1 (en) | 2009-09-25 | 2011-04-07 | E.G.O. Elektro-Gerätebau GmbH | Tubular heater and method for producing such a tubular heater |
CN105072713B (en) * | 2015-09-08 | 2017-05-03 | 湖州思创电热科技有限公司 | Heating pipe high temperature-resistant sealing structure and operation method |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2017589A1 (en) * | 1970-04-13 | 1971-10-28 | Bleckmann & Co | Epoxy resin and silicone rubber for sealing/ - |
DE2410451A1 (en) * | 1974-03-05 | 1975-09-11 | Eichenauer Fa Fritz | Damp-proof seal for tubular, electric, heating elements - has a tubular plastic stopper and a dielectric barrier liq. |
DE2425054A1 (en) * | 1974-05-24 | 1975-12-04 | Elpag Ag Chur | TUBULAR ELECTRIC RADIATOR AND METHOD OF MANUFACTURING THE SAME |
DE2546846C2 (en) * | 1975-10-18 | 1988-12-22 | Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden | Completion of an electric tubular heater |
FR2737381B1 (en) * | 1995-07-26 | 1997-08-29 | Seb Sa | HEATING ELEMENT AND METHOD OF SEALING THE SAME |
-
2001
- 2001-09-21 FR FR0112184A patent/FR2830163B1/en not_active Expired - Fee Related
-
2002
- 2002-09-13 ES ES02356172T patent/ES2252414T3/en not_active Expired - Lifetime
- 2002-09-13 EP EP02356172A patent/EP1296539B1/en not_active Expired - Lifetime
- 2002-09-13 AT AT02356172T patent/ATE311085T1/en not_active IP Right Cessation
- 2002-09-13 DE DE60207506T patent/DE60207506T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE60207506T2 (en) | 2006-08-10 |
DE60207506D1 (en) | 2005-12-29 |
FR2830163A1 (en) | 2003-03-28 |
EP1296539A1 (en) | 2003-03-26 |
ES2252414T3 (en) | 2006-05-16 |
ATE311085T1 (en) | 2005-12-15 |
FR2830163B1 (en) | 2004-08-27 |
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