EP1296539B1 - Procédé de fabrication d'éléments chauffants - Google Patents
Procédé de fabrication d'éléments chauffants 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
- Authority
- 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
Links
- 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
-
- 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)
Description
- 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.
- 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.
Claims (6)
- Procédé de fabrication d'élément chauffant (1) à partir d'un tube droit métallique (2), ledit procédé comprenant les étapes de mise en place d'un ensemble composé d'un fil résistant (4) et de deux bornes de connexion (6) à l'intérieur dudit tube (2), les deux bornes (6) débouchant à chaque extrémité dudit tube (2), ce dernier étant rempli de magnésie (8), 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 (18) du tube à l'aide d'une résine (10) en contact avec la magnésie (8), caractérisé en ce que la polymérisation de la résine (10) est incomplète et laisse la résine (10) dans une étape intermédiaire de gel, préalablement à toute mise en forme dudit tube (2), ladite résine (10) étant polymérisée par la suite, après le procédé de fabrication.
- Procédé de fabrication d'élément chauffant (1) selon l'une des revendications précédentes, caractérisé en ce que la résine (10) utilisée est une résine de type méthylphénylsiloxane.
- Procédé de fabrication d'élément chauffant (1) selon l'une des revendications précédentes, caractérisé en ce que la température de polymérisation de la résine (10) est comprise entre 160 et 220°C.
- Procédé de fabrication d'élément chauffant (1) selon l'une des revendications précédentes, caractérisé en ce que le temps de polymérisation de la résine (10) est compris entre 5 et 15 min.
- Procédé de fabrication d'élément chauffant (1) selon l'une des revendications précédentes, caractérisé en ce qu'il comporte, ultérieurement au bouchage d'au moins l'une des extrémités (18) du tube (2), une étape d'obturation de ladite extrémité (18) par un manchon silicone souple (20) auto-serrant sur la borne (6) liée au fil résistant (4), ladite extrémité (18) du tube (2) étant ensuite rétreinte sur le manchon souple (20) afin d'assurer l'étanchéité aux projections de ladite obturation.
- Elément chauffant (1) pour appareil électroménager, caractérisé en ce qu'il est élaboré à l'aide d'un procédé de fabrication selon l'une des revendications 1 à 5.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0112184 | 2001-09-21 | ||
FR0112184A FR2830163B1 (fr) | 2001-09-21 | 2001-09-21 | Procede de fabrication d'elements chauffants |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1296539A1 EP1296539A1 (fr) | 2003-03-26 |
EP1296539B1 true EP1296539B1 (fr) | 2005-11-23 |
Family
ID=8867486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02356172A Expired - Lifetime EP1296539B1 (fr) | 2001-09-21 | 2002-09-13 | Procédé de fabrication d'éléments chauffants |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1296539B1 (fr) |
AT (1) | ATE311085T1 (fr) |
DE (1) | DE60207506T2 (fr) |
ES (1) | ES2252414T3 (fr) |
FR (1) | FR2830163B1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2868238B1 (fr) * | 2004-03-24 | 2006-05-05 | Seb Sa | Element chauffant |
DE102009048495A1 (de) * | 2009-09-25 | 2011-04-07 | E.G.O. Elektro-Gerätebau GmbH | Rohrheizkörper und Verfahren zur Herstellung eines solchen Rohrheizkörpers |
CN105072713B (zh) * | 2015-09-08 | 2017-05-03 | 湖州思创电热科技有限公司 | 加热管耐高温封口结构及操作方法 |
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 (de) * | 1974-03-05 | 1975-09-11 | Eichenauer Fa Fritz | Feuchtigkeitsdichter abschluss fuer elektrische rohrheizkoerper |
DE2425054A1 (de) * | 1974-05-24 | 1975-12-04 | Elpag Ag Chur | Elektrischer rohrheizkoerper und verfahren zur herstellung desselben |
DE2546846C2 (de) * | 1975-10-18 | 1988-12-22 | Stiebel Eltron Gmbh & Co Kg, 3450 Holzminden | Abschluß eines elektrischen Rohrheizkörpers |
FR2737381B1 (fr) * | 1995-07-26 | 1997-08-29 | Seb Sa | Element chauffant et procede de bouchage dudit element chauffant |
-
2001
- 2001-09-21 FR FR0112184A patent/FR2830163B1/fr not_active Expired - Fee Related
-
2002
- 2002-09-13 AT AT02356172T patent/ATE311085T1/de not_active IP Right Cessation
- 2002-09-13 ES ES02356172T patent/ES2252414T3/es not_active Expired - Lifetime
- 2002-09-13 DE DE60207506T patent/DE60207506T2/de not_active Expired - Fee Related
- 2002-09-13 EP EP02356172A patent/EP1296539B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP1296539A1 (fr) | 2003-03-26 |
FR2830163B1 (fr) | 2004-08-27 |
FR2830163A1 (fr) | 2003-03-28 |
DE60207506D1 (de) | 2005-12-29 |
DE60207506T2 (de) | 2006-08-10 |
ATE311085T1 (de) | 2005-12-15 |
ES2252414T3 (es) | 2006-05-16 |
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