EP0756439B1 - Heating element and method for sealing such an element - Google Patents
Heating element and method for sealing such an element Download PDFInfo
- Publication number
- EP0756439B1 EP0756439B1 EP19960420259 EP96420259A EP0756439B1 EP 0756439 B1 EP0756439 B1 EP 0756439B1 EP 19960420259 EP19960420259 EP 19960420259 EP 96420259 A EP96420259 A EP 96420259A EP 0756439 B1 EP0756439 B1 EP 0756439B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connection terminal
- metal tube
- metal
- sleeve
- 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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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
-
- 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
- H05B3/02—Details
- H05B3/04—Waterproof or air-tight seals for heaters
Definitions
- the present invention relates to the field of heating subassemblies used in electrical appliances and in particular in appliances appliances.
- the invention relates to heating elements of the shielded type and in particular a method of manufacturing and capping such elements heating.
- the object of the present invention is thus to remedy the disadvantages of the prior art and to achieve low cost of heating elements having a good behavior over time, especially at the level of the containment of the magnesia contained in said heating elements.
- Another object of the present invention is to simplify the process shutter or plugging of the heating elements and in particular to automate in an extremely simple way all the steps of this process.
- a complementary object of the present invention is to replace the ceramic beads of these heating elements by parts or means inexpensive and easily achievable industrially.
- an element heating element comprising a metal tube in which a wire is arranged resistive, magnesia providing electrical insulation of said wire and the transmission to the metal tube, a connection terminal attached to each end of said wire and protruding from the metal tube, as well as means for sealing the heating element made using a means electrical insulation of the connection terminal and a material based on silicone filling the inside of the metal tube in the available space between the connection terminal and said tube, characterized in that the isolation means electrical connection is associated with means for centering the connection terminal in the metal tube the arrangement of the electrical insulation means and the centering means not completely closing said tube.
- the electrical insulation means of the connection terminal and the centering means of the connection terminal in the metal tube consist of one piece.
- FIG. 1 representing a heating element according to the invention, shows a metal tube 1, more particularly in the vicinity of an end 1a metal tube 1.
- Figure 1 also shows magnesia 2 inside of the tube 1 and a connection terminal 4 associated with an isolation means electrical connection terminal 4. The latter is intended for connect the heating element to a power source.
- the shutter means of the shielded heating element advantageously consist on the one hand, of a means of electrical insulation of the connection terminal 4 and secondly, a centering means of the terminal connection.
- the tube is definitely clogged using of a silicone-based material deposited inside the metal tube 1 and spreading on the surface of magnesia 2, which does not completely fill the metal tube 1.
- the silicone material not shown in the figures, is a cross-linked or polymerized silicone resin to effectively cover magnesia 2 and thus plug the heating element.
- the connection terminal 4 is advantageously immersed in magnesia 2 inside the tube metal 1 on the one hand and protrudes out of the metal tube 1 on the other.
- the electrical insulation means is for example made of a material ceramic or polymer.
- the electrical insulation means is a piece threaded and fixed on the connection terminal 4.
- the isolation means electric is for example as shown in Figures 1, 3, 4 and 5, a sleeve 6 preferably comprising a tubular central portion 10 and provided with means for centering the connection terminal 4 in the tube metal 1, said centering means not completely closing said tube 1. This arrangement makes it possible to maintain communication between the interior and the outside of the metal tube 1 after the insertion of said sleeve into said tube 1.
- the sleeve 6 is advantageously made of a plastic material resistant to high temperatures. These high temperatures correspond on the one hand to the operating temperatures of the elements according to the invention and on the other hand at the stoving temperatures magnesia 2 contained in the metal tube 1.
- the latter once compacted and dehydrated using a steaming operation, immersed advantageously at least partially the electrical insulation means of the connection terminal 4 while not completely filling the tube metallic 1; there is therefore a free space 1b delimited by the metal tube 1, the magnesia 2 and the connection terminal 4 associated with the insulation means electric. This space 1b free is used to spread the silicone resin.
- the connection terminal 4 serves to connect a resistive wire 3, embedded in the magnesia 2 and constituting the source of heat, on a power supply.
- the electrical insulation means makes it possible in particular to avoid a short circuit between the connection terminal 4 and the metal tube 1. Such a risk can come from example of the accidental presence or not of drops of liquids or other products on the heating element.
- connection terminal 4 is advantageously provided with at least one deformation 5 or a shoulder 5a as shown in FIGS. 3, 4 or 5 to retain in translation the electrical insulation means.
- the deformations 5 are obtained for example by crushing the terminal of connection 4 or in any other known manner keeping ears.
- the deformations 5 are replaced by the shoulder 5a obtained directly by construction of the connection terminal 4.
- the sleeve 6 providing the insulation of the connection terminal 4 is also partially embedded in the magnesia 2 and abuts at its other end against the shoulder 5a.
- the centering means of the connection terminal 4 in the metal tube 1 advantageously consist of at least one branch 8 connected to the part tubular central unit 10 of the sleeve 6 and having a peripheral portion 11 ensuring contact with the metal tube 1.
- Figure la shows a cross section along the line A-A of Figure 1 of the sleeve 6.
- the sleeve 6 has a branch 8 ending in a peripheral portion 11 of tubular form covering at least 180 ° so as to maintain said sleeve 6 in the metal tube 1.
- Figure 3a shows a cross section along the line A-A of Figure 3 of the sleeve 6.
- the sleeve 6 presents two branches 8 each terminating in a peripheral portion 11.
- FIG. 4 represents a sectional view of a preferred variant of realization of a heating element according to the invention.
- the electrical insulation means is a sleeve 6 having a configuration at least three branches 8 distributed symmetrically with respect to an axis of x-x 'symmetry of the metal tube 1.
- Figure 4a shows a cross section along the line A-A of Figure 4 of the sleeve 6.
- This cross section shows an example with four 8 branches symmetrical with respect to the x-x 'axis of the sleeve 6 or the element heating according to the invention.
- Figure 4a also shows a piercing 9 crossed by the connection terminal 4.
- the sleeve 6 advantageously rests on the magnesia 2 inside the tube metal 1 and abuts with its other end against deformation 5 and the connection terminal 4.
- the sleeve 6 can also according to another mode of embodiment of the invention to be secured to the connection terminal 4 by means of any known means and in particular by a mounting force.
- Figure 4 shows also a syringe 15 intended to fill the space 1b between the branches 8 with a liquid silicone resin, which will be polymerized or cross-linked by the following.
- the dimensions of the sleeve 6 are advantageously chosen for allow its introduction with play inside the metal tube 1.
- the branches 8 extend radially through relative to the symmetry axis x-x ', but have dimensions reduced by relative to the total axial length of the sleeve 6.
- the branches 8 are located so completely immersed in the metal tube 1 therefore in the liquid silicone resin spread in space 1b available above the Magnesia 2.
- the part of the sleeve 6 protruding out of the metal tube 1 has a cylindrical shape surrounding the connection terminal 4 and coming into stop against the deformation 5.
- Such a configuration of the sleeve 6 allows to spread more evenly the silicone resin in the space 1b delimited by the metal tube 1, the connection terminal 4 associated with the sleeve 6 and the magnesia 2.
- the electrical insulation means comprises a enamelled coating 7 projected over the entire periphery of the connection terminal 4.
- a sleeve not shown in said figure threaded on the connection terminal 4 makes it possible to center said terminal 4. This means of electrical insulation also allows to save near the end of the tube 1, the space 1b for receiving the silicone resin.
- the method of sealing a shielded heating element in accordance with the present invention of introducing into a metal tube 1 the resistive wire 3 provided of connection terminals 4 at its ends, and to use magnesia 2 for ensure electrical insulation and heat transfer and to use a means for sealing the heating element further comprises steps complementary.
- connection terminal 4 consist on the one hand to use a means of electrical insulation of the connection terminal 4 in combination with the silicone material in as sealing means and secondly to deposit said material based on silicone in the metal tube 1, preferably around the terminal of connection 4 to confine the magnesia 2 inside the metal tube 1. In consequence any contact or communication between the magnesia 2 and the gaseous or liquid medium in which the heating element is used is stop.
- the insulation of the connection terminal 4 is done within the framework of the process according to the invention before using the silicone-based material resin type for plugging the heating element.
- the method according to the invention also consists in using means of centering of the connection terminal 4 in the metal tube 1 arranged on the periphery of the electrical isolation means of the connection terminal 4 and not completely obturating said tube 1.
- magnesia 2 can be introduced into the metal tube 1 after the isolation of the connection terminal 4 held in place relative to the inner walls of the metal tube 1.
- the process according to the invention also consists in intimately binding the means of electrical insulation of the connection terminal 4 and introduce them in the metal tube 1 before the steps of filling the tube metallic 1 with magnesia 2, to compact and to dehydrate said magnesia 2.
- the realization of a heating subassembly consisting of a terminal of connection 4 having a means of electrical insulation and possibly deformations 5 makes it possible to simplify the capping process and consequently the method of manufacturing the shielded heating element according to the invention.
- the process according to the invention also consists in using a piece of type sleeve to put it on the connection terminal 4 and thus to achieve less partially its electrical insulation.
- the latter is completed by the silicone-based material and magnesia 2 dehydrated and compacted to inside the metal tube 1.
- the latter consists of project the enamelled coating 7 on the connection terminal 4 to obtain its electrical insulation.
- Such an operation is easily automatable and requires no manual intervention. It is the same for the threading of the sleeve-type part on the connection terminal 4.
- the method according to the invention also consists in deforming the connection terminal 4 after having threaded the sleeve 6 on the latter, so as to retain in translation said sleeve 6.
- a considerable advantage of the process according to the invention lies in the insulation of the connection terminal 4 before any resinsing operation, thus simplifying said method.
- Another advantage of the present invention is obtained with a possible capillary rise of a silicone resin, during filling of the tube 1, between the connection terminal 4 and the part threaded on this last. Such a lift contributes to the maintenance and fixation of the said piece on the connection terminal 4.
- the resin can in this case realize the interface between the connection terminal 4 and its isolation means.
- An advantage of the sealing method according to the invention lies in the implementation of successive steps, all easily automated to a lower cost.
- Another advantage of the present invention lies in the possible use of a particular silicone resin capable of undergoing treatment with a ultraviolet radiation to obtain a polymerization of said resin. In effect the absence of beads closing the metal tube 1 allows the radiation to directly access the resin. Such an operation may replace an additional stoving.
- Another advantage of the process according to the invention therefore lies in the automatic assembly of the part performing the electrical isolation of the terminal connection 4 and the removal of a manual installation of a bead on the tube 1. Such operations may be carried out before the heating elements according to the invention are formed, ie before that they do not have their final configuration, which in most case is not straight.
- connection terminal 4 consist of more than one element, for example that the electrical insulation means and the means of centering consist of two separate parts, or that the means of centering themselves by more than one piece.
Landscapes
- Resistance Heating (AREA)
Description
La présente invention se rapporte au domaine des sous ensembles chauffants utilisés dans les appareils électriques et en particulier dans les appareils électroménagers. L'invention concerne des éléments chauffants du type blindé et notamment un procédé de fabrication et de bouchage de tels éléments chauffants.The present invention relates to the field of heating subassemblies used in electrical appliances and in particular in appliances appliances. The invention relates to heating elements of the shielded type and in particular a method of manufacturing and capping such elements heating.
Il est déjà connu de boucher des éléments chauffants blindés à l'aide d'une résine silicone liquide en association avec une perle isolante montée sur l'élément chauffant et d'une éventuelle opération d'étuvage pour polymériser ladite résine. Il est également connu d'utiliser une colle silicone déposée à froid, laquelle scelle une perle céramique. De telles méthodes de bouchage présentent l'inconvénient d'utiliser des perles bien dimensionnées et de forme spécialement adaptée à ces méthodes. En outre le nombre d'étapes pour mettre en oeuvre ces procédés de même que leur complexité augmentent le temps de fabrication et le coût des éléments chauffants ainsi réalisés. Le document US 4 314 401 divulgue un élément chauffant selon l'état de la technique antérieure.It is already known to plug shielded heating elements using a liquid silicone resin in combination with an insulating bead mounted on the heating element and a possible steaming operation to polymerize said resin. It is also known to use a silicone adhesive deposited in cold, which seals a ceramic bead. Such methods of capping have the disadvantage of using well sized and shaped beads specially adapted to these methods. In addition the number of steps for implementing these methods as well as their complexity increase the manufacturing time and the cost of the heating elements thus produced. US 4,314,401 discloses a heating element according to the state of the prior art.
L'objet de la présente invention consiste donc à remédier aux inconvénients de l'art antérieur et à réaliser à faible coût des éléments chauffants présentant une bonne tenue dans le temps, notamment au niveau du confinement de la magnésie contenue dans lesdits éléments chauffants.The object of the present invention is thus to remedy the disadvantages of the prior art and to achieve low cost of heating elements having a good behavior over time, especially at the level of the containment of the magnesia contained in said heating elements.
Un autre objet de la présente invention consiste à simplifier le procédé d'obturation ou de bouchage des éléments chauffants et en particulier à automatiser d'une manière extrêmement simple toutes les étapes dudit procédé. Another object of the present invention is to simplify the process shutter or plugging of the heating elements and in particular to automate in an extremely simple way all the steps of this process.
Un objet complémentaire de la présente invention consiste à remplacer les perles céramiques de ces éléments chauffants par des pièces ou des moyens peu coûteux et facilement réalisables industriellement.A complementary object of the present invention is to replace the ceramic beads of these heating elements by parts or means inexpensive and easily achievable industrially.
Les objets assignés à la présente invention sont atteints à l'aide d'un élément chauffant blindé, comportant un tube métallique dans lequel sont agencés un fil résistif, de la magnésie assurant l'isolation électrique dudit fil et la transmission thermique vers le tube métallique, une borne de connexion fixée sur chaque extrémité dudit fil et faisant saillie hors du tube métallique, ainsi que des moyens d'obturation de l'élément chauffant réalisés à l'aide d'un moyen d'isolation électrique de la borne de connexion et d'un matériau à base de silicone remplissant l'intérieur du tube métallique dans l'espace disponible entre la borne de connexion et ledit tube, caractérisé en ce que le moyen d'isolation électrique est associé à des moyens de centrage de la borne de connexion dans le tube métallique l'arrangement du moyen d'isolation électrique et des moyens de centrage n'obturant pas complètement ledit tube.The objects assigned to the present invention are achieved with the aid of an element heating element, comprising a metal tube in which a wire is arranged resistive, magnesia providing electrical insulation of said wire and the transmission to the metal tube, a connection terminal attached to each end of said wire and protruding from the metal tube, as well as means for sealing the heating element made using a means electrical insulation of the connection terminal and a material based on silicone filling the inside of the metal tube in the available space between the connection terminal and said tube, characterized in that the isolation means electrical connection is associated with means for centering the connection terminal in the metal tube the arrangement of the electrical insulation means and the centering means not completely closing said tube.
Selon une forme d'exécution avantageuse, le moyen d'isolation électrique de la borne de connexion et les moyens de centrage de la borne de connexion dans le tube métallique sont constitués d'une seule pièce.According to an advantageous embodiment, the electrical insulation means of the connection terminal and the centering means of the connection terminal in the metal tube consist of one piece.
Les objets assignés à la présente invention sont également atteints à l'aide d'un procédé d'obturation d'un élément chauffant blindé consistant :
- à introduire dans un tube métallique un fil résistif muni de bornes de connexions à ses extrémités,
- à disposer un moyen d'isolation électrique de la borne de connexion et des moyens de centrage de la borne de connexion dans le tube métallique,
- à remplir le tube de magnésie pour assurer l'isolation électrique et la transmission thermique,
- à déposer un matériau à base de silicone dans le tube métallique de préférence autour de la borne de connexion afin de sceller le tube métallique contenant la magnésie.
- to introduce into a metal tube a resistive wire provided with connection terminals at its ends,
- disposing an electrical isolation means of the connection terminal and centering means of the connection terminal in the metal tube,
- to fill the magnesia tube for electrical insulation and thermal transmission,
- depositing a silicone material in the metal tube preferably around the connection terminal to seal the metal tube containing the magnesia.
D'autres particularités et avantages ressortiront mieux à la lecture de la description donnée ci-après en référence aux dessins annexés donnés à titre d'exemples illustratifs mais non limitatifs dans lesquels :
- la figure 1 représente une vue partielle en coupe d'exemple de réalisation d'un élément chauffant conforme à l'invention,
- la figure la représente une vue en section selon la ligne A-A de la figure 1,
- la figure 2 représente une vue partielle en coupe d'une variante de réalisation d'un élément chauffant conforme à l'invention,
- la figure 3 représente une vue partielle en coupe d'une autre variante de réalisation d'un élément chauffant conforme à l'invention,
- la figure 3a représente une vue en section selon la ligne A-A de la figure 3,
- la figure 4 représente une vue en coupe d'une variante préférentielle de réalisation d'un élément chauffant conforme à l'invention,
- la figure 4a représente une vue en section selon la ligne A-A de la figure 4,
- la figure 5 représente une autre variante d'un élément chauffant conforme à l'invention et représenté à la figure 4.
- FIG. 1 represents a partial sectional view of an exemplary embodiment of a heating element according to the invention,
- FIG. 1a is a sectional view along line AA of FIG. 1,
- FIG. 2 represents a partial sectional view of an alternative embodiment of a heating element according to the invention,
- FIG. 3 represents a partial sectional view of another variant embodiment of a heating element according to the invention,
- FIG. 3a shows a sectional view along the line AA of FIG. 3,
- FIG. 4 represents a sectional view of a preferred embodiment of a heating element according to the invention,
- FIG. 4a shows a sectional view along the line AA of FIG. 4,
- FIG. 5 represents another variant of a heating element according to the invention and represented in FIG. 4.
La figure 1, représentant un élément chauffant conforme à l'invention, montre
un tube métallique 1, plus particulièrement au voisinage d'une extrémité la du
tube métallique 1. La figure 1 montre également de la magnésie 2 à l'intérieur
du tube 1 et une borne de connexion 4 associée à un moyen d'isolation
électrique de ladite borne de connexion 4. Cette dernière est destinée à
connecter l'élément chauffant sur une source d'alimentation électrique.FIG. 1, representing a heating element according to the invention, shows
a
Les moyens d'obturation de l'élément chauffant blindé conforme à l'invention
sont avantageusement constitués d'une part, d'un moyen d'isolation électrique
de la borne de connexion 4 et d'autre part, d'un moyen de centrage de la borne
de connexion. Lors de l'assemblage, le tube est définitivement bouché à l'aide
d'un matériau à base de silicone déposé à l'intérieur du tube métallique 1 et se
répandant à la surface de la magnésie 2, laquelle ne remplit pas entièrement le
tube métallique 1. Le matériau à base de silicone, non représenté aux figures,
est une résine de silicone réticulée ou polymérisée pour recouvrir efficacement
la magnésie 2 et boucher ainsi l'élément chauffant. La borne de connexion 4
est avantageusement immergée dans la magnésie 2 à l'intérieur du tube
métallique 1 d'une part et fait saillie hors du tube métallique 1 d'autre part.The shutter means of the shielded heating element according to the invention
advantageously consist on the one hand, of a means of electrical insulation
of the connection terminal 4 and secondly, a centering means of the terminal
connection. When assembling, the tube is definitely clogged using
of a silicone-based material deposited inside the
Le moyen d'isolation électrique est par exemple réalisé avec un matériau
céramique ou polymère. Préférentiellement le moyen d'isolation électrique est
une pièce enfilée et fixée sur la borne de connexion 4. Le moyen d'isolation
électrique est par exemple tel que cela est représenté aux figures 1, 3, 4 et 5,
un manchon 6 comportant préférentiellement une partie centrale tubulaire 10 et
muni de moyens de centrage de la borne de connexion 4 dans le tube
métallique 1, lesdits moyens de centrage n'obturant pas totalement ledit tube 1.
Cette disposition permet de conserver une communication entre l'intérieur et
l'extérieur du tube métallique 1 après l'introduction dudit manchon dans ledit
tube 1.The electrical insulation means is for example made of a material
ceramic or polymer. Preferably the electrical insulation means is
a piece threaded and fixed on the connection terminal 4. The isolation means
electric is for example as shown in Figures 1, 3, 4 and 5,
a
Le manchon 6 est avantageusement réalisé avec un matériau plastique
résistant à des températures élevées. Ces températures élevées correspondent
d'une part aux températures de fonctionnement d'utilisation des éléments
chauffants conformes à l'invention et d'autre part aux températures d'étuvage
de la magnésie 2 contenue dans le tube métallique 1. Cette dernière, une fois
compactée et déshydratée à l'aide d'une opération d'étuvage, immerge
avantageusement au moins partiellement le moyen d'isolation électrique de la
borne de connexion 4 tout en ne remplissant pas complètement le tube
métallique 1 ; il subsiste donc un espace 1b libre délimité par le tube métallique
1, la magnésie 2 et la borne de connexion 4 associée au moyen d'isolation
électrique. Cet espace 1b libre est utilisé pour y répandre la résine de silicone.
La borne de connexion 4 sert à connecter un fil résistif 3, noyé dans la
magnésie 2 et constituant la source de chaleur, sur une alimentation électrique.
Le moyen d'isolation électrique permet notamment d'éviter un court-circuit entre
la borne de connexion 4 et le tube métallique 1. Un tel risque peut provenir par
exemple de la présence accidentelle ou non de gouttes de liquides ou d'autres
produits sur l'élément chauffant.The
La borne de connexion 4 est avantageusement pourvue d'au moins une
déformation 5 ou d'un épaulement 5a tel que cela est représenté aux figures 1,
3, 4 ou 5 pour retenir en translation le moyen d'isolation électrique. Les
déformations 5 sont obtenues par exemple par écrasement de la borne de
connexion 4 ou de toute autre manière connue permettant de réaliser les
oreilles de maintien. Selon une variante de réalisation de la borne de connexion
4 représentée à la figure 3, les déformations 5 sont remplacées par
l'épaulement 5a obtenu directement par construction de la borne de connexion
4. Dans cet exemple de réalisation, le manchon 6 réalisant l'isolation de la
borne de connexion 4 est également noyé partiellement dans la magnésie 2 et
vient en butée à son autre extrémité contre l'épaulement 5a.The connection terminal 4 is advantageously provided with at least one
deformation 5 or a shoulder 5a as shown in FIGS.
3, 4 or 5 to retain in translation the electrical insulation means. The
deformations 5 are obtained for example by crushing the terminal of
connection 4 or in any other known manner
keeping ears. According to an alternative embodiment of the connection terminal
4 shown in FIG. 3, the deformations 5 are replaced by
the shoulder 5a obtained directly by construction of the connection terminal
4. In this embodiment, the
Les moyens de centrage de la borne de connexion 4 dans le tube métallique 1
sont avantageusement constitués par au moins une branche 8 reliée à la partie
centrale tubulaire 10 du manchon 6 et présentant une partie périphérique 11
assurant le contact avec le tube métallique 1.The centering means of the connection terminal 4 in the
La figure la montre une section transversale selon la ligne A-A de la figure 1
du manchon 6. Dans cet exemple de réalisation le manchon 6 présente une
branche 8 se terminant par une partie périphérique 11 de forme tubulaire
couvrant au moins 180° de manière à assurer le maintien dudit manchon 6
dans le tube métallique 1.Figure la shows a cross section along the line A-A of Figure 1
of the
La figure 3a montre une section transversale selon la ligne A-A de la figure 3
du manchon 6. Dans cet autre exemple de réalisation le manchon 6 présente
deux branches 8 se terminant chacune par une partie périphérique 11. Figure 3a shows a cross section along the line A-A of Figure 3
of the
La figure 4 représente une vue en coupe d'une variante préférentielle de
réalisation d'un élément chauffant conforme à l'invention. Dans cette variante,
le moyen d'isolation électrique est un manchon 6 présentant une configuration
à au moins trois branches 8 réparties symétriquement par rapport à un axe de
symétrie x-x' du tube métallique 1.FIG. 4 represents a sectional view of a preferred variant of
realization of a heating element according to the invention. In this variant,
the electrical insulation means is a
La figure 4a montre une section transversale selon la ligne A-A de la figure 4
du manchon 6. Cette section transversale visualise un exemple avec quatre
branches 8 symétriques par rapport à l'axe x-x' du manchon 6 ou de l'élément
chauffant conforme à l'invention. La figure 4a montre également un perçage 9
traversé par la borne de connexion 4.Figure 4a shows a cross section along the line A-A of Figure 4
of the
Le manchon 6 repose avantageusement sur la magnésie 2 à l'intérieur du tube
métallique 1 et vient en butée avec son autre extrémité contre les déformations
5 et la borne de connexion 4. Le manchon 6 peut aussi selon un autre mode de
réalisation de l'invention être solidarisé de la borne de connexion 4 à l'aide de
tout moyen connu et notamment par un montage en force. La figure 4 montre
également une seringue 15 destinée à remplir l'espace 1b entre les branches 8
avec une résine de silicone liquide, laquelle sera polymérisée ou réticulée par
la suite. Les dimensions du manchon 6 sont avantageusement choisies pour
permettre son introduction avec jeu à l'intérieur du tube métallique 1.The
Dans l'exemple de réalisation de l'élément chauffant blindé conforme à
l'invention et représenté à la figure 5, les branches 8 s'étendent radialement par
rapport à l'axe symétrie x-x', mais présentent des dimensions réduites par
rapport à la longueur axiale totale du manchon 6. Les branches 8 se trouvent
ainsi complètement immergées dans le tube métallique 1 par conséquent dans
la résine silicone liquide répandue dans l'espace 1b disponible au-dessus de la
magnésie 2. La partie du manchon 6 faisant saillie hors du tube métallique 1
présente une forme cylindrique entourant la borne de connexion 4 et venant en
butée contre la déformation 5. Une telle configuration du manchon 6 permet
d'étendre plus uniformément la résine silicone dans l'espace 1b délimité par le
tube métallique 1, la borne de connexion 4 associée au manchon 6 et la
magnésie 2.In the exemplary embodiment of the shielded heating element according to
the invention and shown in FIG. 5, the
Dans l'exemple de réalisation de l'élément chauffant conforme à l'invention et
représenté à la figure 2, le moyen d'isolation électrique comporte un
revêtement émaillé 7 projeté sur toute la périphérie de la borne de connexion 4.
Un manchon non représenté à ladite figure enfilé sur la borne de connexion 4
permet d'assurer le centrage de ladite borne 4. Ce moyen d'isolation électrique
permet également de ménager au voisinage d'une extrémité la du tube
métallique 1, l'espace 1b destiné à recevoir la résine de silicone.In the embodiment of the heating element according to the invention and
shown in FIG. 2, the electrical insulation means comprises a
enamelled coating 7 projected over the entire periphery of the connection terminal 4.
A sleeve not shown in said figure threaded on the connection terminal 4
makes it possible to center said terminal 4. This means of electrical insulation
also allows to save near the end of the
Le procédé d'obturation d'un élément chauffant blindé conforme à la présente
invention consistant à introduire dans un tube métallique 1 le fil résistif 3 muni
de bornes de connexion 4 à ses extrémités, et à utiliser de la magnésie 2 pour
assurer l'isolation électrique et la transmission thermique ainsi qu'à utiliser un
moyen d'obturation de l'élément chauffant comprend en outre des étapes
complémentaires.The method of sealing a shielded heating element in accordance with the present
invention of introducing into a
Ces dernières consistent d'une part à utiliser un moyen d'isolation électrique de
la borne de connexion 4 en association avec le matériau à base de silicone en
tant que moyens d'obturation et d'autre part à déposer ledit matériau à base de
silicone dans le tube métallique 1, de préférence autour de la borne de
connexion 4 pour confiner la magnésie 2 à l'intérieur du tube métallique 1. En
conséquence tout contact ou toute communication entre la magnésie 2 et le
milieu gazeux ou liquide dans lequel est employé l'élément chauffant est
empêché. L'isolation de la borne de connexion 4 se fait dans le cadre du
procédé conforme à l'invention avant l'utilisation du matériau à base de silicone
du type résine pour boucher l'élément chauffant.These consist on the one hand to use a means of electrical insulation of
the connection terminal 4 in combination with the silicone material in
as sealing means and secondly to deposit said material based on
silicone in the
Le procédé conforme à l'invention consiste également à utiliser des moyens de
centrage de la borne de connexion 4 dans le tube métallique 1 disposés sur la
périphérie du moyen d'isolation électrique de la borne de connexion 4 et
n'obturant pas complètement ledit tube 1. Ainsi la magnésie 2 peut être
introduite dans le tube métallique 1 après l'isolation de la borne de connexion 4
maintenue en place par rapport aux parois intérieures du tube métallique 1.The method according to the invention also consists in using means of
centering of the connection terminal 4 in the
Le procédé conforme à l'invention consiste également à lier intimement le
moyen d'isolation électrique de la borne de connexion 4 et de les introduire
dans le tube métallique 1 avant les étapes consistant à remplir le tube
métallique 1 avec la magnésie 2, à compacter et à déshydrater ladite magnésie
2. La réalisation d'un sous-ensemble chauffant constitué d'une borne de
connexion 4 présentant un moyen d'isolation électrique et éventuellement des
déformations 5 permet de simplifier le procédé de bouchage et par conséquent
le procédé de fabrication de l'élément chauffant blindé conforme à l'invention.The process according to the invention also consists in intimately binding the
means of electrical insulation of the connection terminal 4 and introduce them
in the
Le procédé conforme à l'invention consiste également à utiliser une pièce du
type manchon pour l'enfiler sur la borne de connexion 4 et réaliser ainsi au
moins partiellement son isolation électrique. Cette dernière est complétée par le
matériau à base de silicone et la magnésie 2 déshydratée et compactée à
l'intérieur du tube métallique 1.The process according to the invention also consists in using a piece of
type sleeve to put it on the connection terminal 4 and thus to achieve
less partially its electrical insulation. The latter is completed by the
silicone-based material and
Selon une variante du procédé conforme à l'invention, ce dernier consiste à
projeter le revêtement émaillé 7 sur la borne de connexion 4 pour obtenir son
isolation électrique. Une telle opération est facilement automatisable et ne
nécessite aucune intervention manuelle. Il en est de même pour l'enfilement de
la pièce du type manchon sur la borne de connexion 4. Le procédé conforme à
l'invention consiste également à déformer la borne de connexion 4 après avoir
enfilé le manchon 6 sur cette dernière, de manière à retenir en translation ledit
manchon 6.According to a variant of the process according to the invention, the latter consists of
project the enamelled coating 7 on the connection terminal 4 to obtain its
electrical insulation. Such an operation is easily automatable and
requires no manual intervention. It is the same for the threading of
the sleeve-type part on the connection terminal 4. The method according to
the invention also consists in deforming the connection terminal 4 after having
threaded the
Un avantage considérable du procédé conforme à l'invention réside dans l'isolation de la borne de connexion 4 avant toute opération de résinage, simplifiant ainsi ledit procédé.A considerable advantage of the process according to the invention lies in the insulation of the connection terminal 4 before any resinsing operation, thus simplifying said method.
Un autre avantage de la présente invention est obtenu avec une éventuelle
remontée par capillarité d'une résine silicone, lors du remplissage du tube
métallique 1, entre la borne de connexion 4 et la pièce enfilée sur cette
dernière. Une telle remontée contribue au maintien et à la fixation de ladite
pièce sur la borne de connexion 4. La résine peut dans ce cas réaliser
l'interface entre la borne de connexion 4 et son moyen d'isolation.Another advantage of the present invention is obtained with a possible
capillary rise of a silicone resin, during filling of the
Un avantage du procédé d'obturation conforme à invention réside dans la mise en oeuvre d'étapes successives, toutes automatisables facilement à un moindre coût.An advantage of the sealing method according to the invention lies in the implementation of successive steps, all easily automated to a lower cost.
Un autre avantage de la présente invention réside dans l'utilisation possible
d'une résine silicone particulière susceptible de subir un traitement par un
rayonnement ultraviolet pour obtenir une polymérisation de ladite résine. En
effet l'absence de perles obturant le tube métallique 1 permet aux
rayonnements d'accéder directement à la résine. Une telle opération peut
remplacer un étuvage supplémentaire.Another advantage of the present invention lies in the possible use
of a particular silicone resin capable of undergoing treatment with a
ultraviolet radiation to obtain a polymerization of said resin. In
effect the absence of beads closing the
Un autre avantage du procédé conforme à invention réside donc dans le
montage en automatique de la pièce réalisant l'isolation électrique de la borne
de connexion 4 et la suppression d'une pose manuelle d'une perle sur le tube
métallique 1. De telles opérations peuvent être effectuées avant que les
éléments chauffants conformes à l'invention ne soient formés, c'est à dire avant
qu'ils ne présentent leur configuration définitive, laquelle dans la plupart des
cas n'est pas rectiligne.Another advantage of the process according to the invention therefore lies in the
automatic assembly of the part performing the electrical isolation of the terminal
connection 4 and the removal of a manual installation of a bead on the
Tous ces avantages conduisent à un autre avantage significatif permettant de réduire sensiblement le coût de fabrication des éléments chauffants blindés conformes à l'invention.All these advantages lead to another significant advantage allowing substantially reduce the cost of manufacturing the armored heating elements according to the invention.
A titre de variante on peut imaginer que les moyens d'isolation électrique et les moyens de centrage de la borne de connexion 4 soient constitués de plus d'un élément, par exemple que les moyens d'isolation électrique et les moyens de centrage soient constitués par deux pièces distinctes, ou que les moyens de centrage soient eux-mêmes constitués par plus d'une pièce.As a variant, it is possible to imagine that the electrical insulation means and the centering means of the connection terminal 4 consist of more than one element, for example that the electrical insulation means and the means of centering consist of two separate parts, or that the means of centering themselves by more than one piece.
Claims (12)
- A metal-clad heater element comprising a metal tube (1) having arranged therein: a resistor wire (3); magnesia (2) serving to insulate said wire electrically and to transmit heat towards the metal tube (1); a connection terminal (4) fastened to each end of said wire and projecting out from the metal tube (1); and closure means for closing the heater element, the closure means being made with the help of electrical insulation means (6; 7) for each connection terminal (4) and a material based on silicone filling the inside of the metal tube (1) in the space (1b) available between the connection terminal (4) and said tube (1), the element being characterized in that the electrical insulation means is associated with means for centering the connection terminal (4) in the metal tube (1), the arrangement of the electrical insulation means and the centering means not completely closing said tube (1).
- A metal-clad heater element according to claim 1, in which the electrical insulation means of the connection terminal (4) and the centering means for centering the connection terminal (4) in the metal tube (1) are constituted by a single part.
- A metal-clad heater element according to claim 2, in which the means for centering the connection terminal (4) in the metal tube (1) are advantageously constituted by at least one branch (8) connected to the tubular central portion (10) of the sleeve (6) and presenting a peripheral portion (11) providing contact with the metal tube (1).
- A metal-clad heater element according to claim 2, in which said part forms a sleeve (6).
- A metal-clad heater element according to claim 4, in which the sleeve (6) presents a configuration having at least three branches (8) distributed about an axis of symmetry (x-x').
- A metal-clad heater element according to any one of claims 1 to 5, in which the silicone-based material is a cross-linked or polymerized silicone resin for covering the magnesia (2) and thus plugging the heater element.
- A metal-clad heater element according to any one of claims 4 to 6, in which the sleeve (6) is made out of a plastics material that withstands high temperatures.
- A metal-clad heater element according to any one of claims 4 to 7, in which the connection terminal (4) is provided with deformations (5) for holding the sleeve (6) in translation.
- A method of closing a metal-clad heater element, the method consisting in:· introducing a resistor wire (3) carrying connection terminals (4) at its ends into a metal tube (1);· disposing means for electrically insulating the connection terminal (4) and means for centering the connection terminal (4) in the metal tube (1);· filling the tube (1) with magnesia (2) to provide electrical insulation and heat transmission; and· disposing a silicone-based material in the metal tube, preferably around the connection terminal (4) in order to seal the metal tube (1) containing the magnesia (2).
- A method according to claim 9, in which the electrical insulation means and the connection terminal (4) are intimately bonded together and are introduced into the metal tube (1) before the steps consisting in filling the metal tube (1) with magnesia (2), in compacting said magnesia (2), and in dehydrating said magnesia (2).
- A method according to claim 9 or claim 10, in which a sleeve (6) is used for threading onto the connection terminal (4) and thus for providing at least part of its electrical insulation.
- A method according to claim 11, in which the connection terminal (4) is deformed after the sleeve (6) has been threaded thereon, so as to hold said sleeve (6) in translation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9509344 | 1995-07-26 | ||
FR9509344A FR2737381B1 (en) | 1995-07-26 | 1995-07-26 | HEATING ELEMENT AND METHOD OF SEALING THE SAME |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0756439A1 EP0756439A1 (en) | 1997-01-29 |
EP0756439B1 true EP0756439B1 (en) | 2005-12-07 |
Family
ID=9481593
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19960420259 Expired - Lifetime EP0756439B1 (en) | 1995-07-26 | 1996-07-26 | Heating element and method for sealing such an element |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0756439B1 (en) |
DE (1) | DE69635541T2 (en) |
FR (1) | FR2737381B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2830163B1 (en) * | 2001-09-21 | 2004-08-27 | Seb Sa | METHOD FOR MANUFACTURING HEATING ELEMENTS |
CN100398963C (en) * | 2004-04-30 | 2008-07-02 | 乐金电子(天津)电器有限公司 | Sealing structure for bushing heater of refrigerator |
DE102006005322B4 (en) * | 2006-02-06 | 2010-04-29 | Bleckmann Gmbh & Co. Kg | Tubular heater with insulating compound in the connection end area |
DE202008016439U1 (en) | 2008-12-11 | 2009-03-12 | Türk & Hillinger GmbH | Cartridge Heater |
ITUB20152625A1 (en) * | 2015-07-30 | 2017-01-30 | Irca Spa | ARMORED RESISTANCE AND RELATIVE PRODUCTION PROCESS |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3694626A (en) * | 1971-09-30 | 1972-09-26 | Gen Electric | Electrical resistance heater |
JPS5227598A (en) * | 1975-08-28 | 1977-03-01 | Hitachi Heating Appliance Co Ltd | Carged material for a heating unit |
JPS55100692A (en) * | 1979-01-29 | 1980-07-31 | Isamu Saku | Method of sealing pipe heater |
US4346287A (en) * | 1980-05-16 | 1982-08-24 | Watlow Electric Manufacturing Company | Electric heater and assembly |
US5380987A (en) * | 1993-11-12 | 1995-01-10 | Uop | Electric heater cold pin insulation |
-
1995
- 1995-07-26 FR FR9509344A patent/FR2737381B1/en not_active Expired - Fee Related
-
1996
- 1996-07-26 EP EP19960420259 patent/EP0756439B1/en not_active Expired - Lifetime
- 1996-07-26 DE DE69635541T patent/DE69635541T2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE69635541D1 (en) | 2006-01-12 |
EP0756439A1 (en) | 1997-01-29 |
FR2737381B1 (en) | 1997-08-29 |
FR2737381A1 (en) | 1997-01-31 |
DE69635541T2 (en) | 2006-08-10 |
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