EP0739153A1 - Heating element brazed onto a support - Google Patents

Heating element brazed onto a support Download PDF

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Publication number
EP0739153A1
EP0739153A1 EP96420137A EP96420137A EP0739153A1 EP 0739153 A1 EP0739153 A1 EP 0739153A1 EP 96420137 A EP96420137 A EP 96420137A EP 96420137 A EP96420137 A EP 96420137A EP 0739153 A1 EP0739153 A1 EP 0739153A1
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EP
European Patent Office
Prior art keywords
metal
heating assembly
heating element
metal support
assembly according
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EP96420137A
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German (de)
French (fr)
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EP0739153B1 (en
Inventor
Henri Galliou
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SEB SA
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SEB SA
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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
    • H05B3/68—Heating arrangements specially adapted for cooking plates or analogous hot-plates
    • H05B3/688—Fabrication of the plates
    • 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
    • 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
    • H05B3/50—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material heating conductor arranged in metal tubes, the radiating surface having heat-conducting fins
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/021—Heaters specially adapted for heating liquids

Definitions

  • the present invention relates to the field of heating assemblies intended to be mounted in all types of electrical apparatus.
  • the present invention relates more particularly to heating assemblies used in all types of household appliances.
  • the present invention also relates to the arrangement and fixing of shielded heating elements in household appliances.
  • heating assemblies consisting of an armored heating element fixed by means of a brazing operation on a metal support, such assemblies are made exclusively with identical metals having similar physico-chemical properties, so as not to generate differential expansion detrimental to their mechanical strength over time.
  • Known heating assemblies are therefore tainted by a significant cost price, and this particularly when the use of noble metals of the stainless metal type is essential.
  • the object of the present invention therefore consists in producing heating assemblies which do not have the drawbacks of the prior art on the one hand, and which have good mechanical strength over time on the other hand.
  • Another object of the present invention is to provide heating assemblies having innumerable mechanical and thermal properties, as well as a wide range of possibilities for adaptation or transformation of said heating assembly.
  • a heating assembly comprising at least one shielded heating element comprising a metal tube fixed to at least one metal support using a fusible metal layer characterized in that the material of the metal tube is different from the material of the metal support.
  • the objects of the present invention are also achieved by means of a method of assembling a heating assembly, consisting in intimately bonding at least one armored heating element with a metal support using a layer of solder, characterized in that that it consists in carrying out a brazing operation for constituent materials different from the metal tube of the armored heating element on the one hand and of the metal support on the other hand.
  • FIG. 1 represents a sectional view of the assembly of an armored heating element 1, of a metal support 3 and of a fusible metal layer making it possible to produce a rigid connection.
  • the shielded heating element 1 made so known, consists of a metal tube inside which are arranged a resistive filament and an electrical insulating powder of the magnesia type.
  • the heating element 1 is advantageously deformed to present a flat part intended to come into contact with the metal support 3.
  • the material constituting the metal tube of the armored heating element 1 is, according to the invention, different from the material constituting the metal support 3. The latter is preferably brazed directly on the metal support 3 according to an alternative embodiment of the invention.
  • the fusible metal layer is preferably a solder layer 2 deposited on at least one of the constituent elements of said heating assembly.
  • the brazing layer 2 providing the interface between the metal support 3 and the shielded heating element 1, is advantageously made up of a metal powder, heat conductive and of a suitable stripper.
  • the flattened or flat part of the shielded heating element 1 makes it possible to increase the contact surface between the metal support 3 and said shielded heating element 1.
  • the heating assembly according to the invention comprises at least one brazing layer 2 deposited by any means on at least one of the constituent elements of said heating assembly.
  • the metal tube of the shielded heating element 1 and the metal support 3 are made of aluminum and stainless metal, respectively.
  • the metal tube of the shielded heating element 1 is made of stainless metal and the metal support 3 is made of aluminum, or any other thermal conductive material capable of being bonded to said shielded heating element 1 by brazing.
  • the metal support 3 can also consist of at least two metal plates assembled by any means and in particular by brazing. Such an assembly can be carried out simultaneously with the operation of brazing of the shielded heating element 1 on the metal support 3. It is also possible to assemble by brazing, in accordance with the invention, the shielded heating element 1 and the metal support 3, which are made respectively of copper and stainless metal or copper and aluminum.
  • the metal plate 3a diffusing the thermal energy, on the one hand disposed between the shielded heating element 1 and the metal support 3, and on the other hand secured to said element armored heater 1 and said metal support 3 by means of brazing layers 2.
  • the material constituting the diffusing metal plate 3a makes it possible to obtain, depending on the material considered, a temperature gradient between the metal support 3 and the armored heating element 1.
  • the metal plate 3a is, for example, made of aluminum or copper or another material allowing the diffusion of thermal energy.
  • the metal plate 3a can also be made of a material identical or similar to the material constituting the shielded heating element 1 or the metal support 3.
  • the gradient temperature that can be obtained with a metal support 3 made with a suitable material is particularly advantageous, when said metal support 3, fixed or maintained by a frame, made of plastic material not supporting high temperatures.
  • the metal support 3 can thus play the role of thermal brake.
  • the metal plate 3a can also be used in various applications for the heating assembly. It is thus possible to increase the thickness, and consequently the mechanical rigidity of the heating assembly thus produced and constitute, for example, a thermal diffusing bottom for a pressure cooker, for a fryer or for any other household appliance.
  • the metallic support 3 is preferably made of a stainless metallic material or any other noble metal when it is brought into contact with food articles intended to be cooked or heated. This is particularly the case for electric kettles or possibly electric coffee makers.
  • a metal support 3 made of stainless metal delays scaling and facilitates mechanical cleaning operations and allows chemical cleaning.
  • a stainless steel alloy may also be suitable for producing the metal support 3.
  • FIG. 3 represents another alternative embodiment of the heating assembly according to the invention, which comprises a metal circulation tube 5 capable of transporting a fluid, said circulation tube 5 being intimately linked to said heating assembly.
  • the circulation tube 5 advantageously has a circular section and a straight, U-shaped or horseshoe shape. Another configuration matching the shape or configuration of the element on which it is attached is also possible.
  • Figure 3 shows a sectional view of such a heating assembly according to the invention.
  • the circulation tube 5 is brazed directly on the armored heating element 1. This is particularly the case for twin-tube boilers for coffee machines or machines for dispensing hot drinks or steam.
  • Such heating assemblies for example consist of an armored heating element 1 made of aluminum and a circulation tube 5 made for example of steel or stainless metal.
  • the shielded heating element 1 has, for this purpose, a deformation matching at least partially the configuration or the external shape of the circulation tube 5, so as to produce a large contact surface between the shielded heating element 1 and the circulation tube 5.
  • the solder layer 2 is used as the connection interface between the shielded heating element 1 and the circulation tube 5.
  • Such a heating assembly can also, according to another alternative embodiment according to the invention, consist of an armored heating element 1 made of aluminum, brazed to the circulation tube 5 also made of aluminum, the metal support 3 being produced for example from a stainless metal. The latter is for example fixed on the assembly thus formed by a brazing operation. The mechanical rigidity of the heating assembly according to the invention is thus ensured at least partially by brazing operations.
  • circulation tube 5 can also be brazed either on the metal diffusing plate 3a, or directly on the metal support 3.
  • the heating assembly produced in accordance with the invention is therefore obtained from a manufacturing process consisting in intimately bonding at least one shielded heating element 1 with a metal support 3 using a layer of solder 2.
  • This assembly process also consists in carrying out a brazing operation for different constituent materials of the metal tube of the armored heating element 1 on the one hand, and of the metal support 3 on the other hand.
  • the method according to the invention consists in depositing the solder layer 2 on at least one of the parts of the heating assembly before the assembly operation of said parts.
  • the latter are constituted for example by the metal support 3 and by the armored heating element 1.
  • the latter can advantageously be deformed using a stamping operation for example, to present a large contact surface with the metal support 3 on which it will be added during the assembly of the heating assembly according to the invention.
  • the brazing layer 2 makes it possible to make a mechanical connection after a cooking or steaming operation.
  • the advantage of the heating assembly according to the invention lies in the use of a limited quantity of noble materials of the stainless metal type.
  • the metal support 3 has for example a thickness greater than or equal to 0.5 mm.
  • the metal support 3 also has anti-corrosion properties and resists cleaning with vinegar.
  • Another unexpected advantage of the heating assembly according to the invention is obtained by a heat dissipation of at least 30 watts per cm 2 between the shielded heating element 1 and the metal support 3, in no way altering the mechanical rigidity of the assembly thus produced.
  • Another advantage of the heating assembly according to the invention lies in obtaining a temperature gradient with the use of a diffusing metal plate 3a 3a and a metal support 3.
  • An additional advantage of the heating assembly according to the invention lies in obtaining a heating base of dimension, weight and thermal performance adaptable to suit.

Abstract

The element (1) has a metal sheath, containing magnesia powder insulation, flattened along one side (1a) to increase its contact area on a supporting plate (3). Opt., where the support is a pipe, this area is correspondingly concave. The dissimilar sheath and support metals are selected from aluminium, copper, stainless steel or other non-corroding thermally conductive metals. Opt., the support plate comprises two metal sheets brazed together, e.g. simultaneously with the brazing (2) of the element to one of the plates which acts as a diffuser, limiting the heat transfer to an non-metallic appliance case supporting the other plate.

Description

La présente invention se rapporte au domaine des ensembles chauffants destinés à être montés dans tous types d'appareils électriques. La présente invention concerne plus particulièrement des ensembles chauffants utilisés dans tous types d'appareils électroménagers. La présente invention concerne également l'agencement et la fixation d'éléments chauffants blindés dans des appareils électroménagers.The present invention relates to the field of heating assemblies intended to be mounted in all types of electrical apparatus. The present invention relates more particularly to heating assemblies used in all types of household appliances. The present invention also relates to the arrangement and fixing of shielded heating elements in household appliances.

Il est déjà connu de réaliser des ensembles chauffants constitués d'un élément chauffant blindé fixé par l'intermédiaire d'une opération de brasage sur un support métallique, de tels assemblages se font exclusivement avec des métaux identiques présentant des propriétés physico-chimiques similaires, de manière à ne pas générer une dilatation différentielle nuisible à leur tenue mécanique dans le temps. Les ensembles chauffants connus sont donc entachés d'un prix de revient important, et ceci particulièrement lorsque l'utilisation de métaux nobles du type métaux inoxydables est indispensable.It is already known to produce heating assemblies consisting of an armored heating element fixed by means of a brazing operation on a metal support, such assemblies are made exclusively with identical metals having similar physico-chemical properties, so as not to generate differential expansion detrimental to their mechanical strength over time. Known heating assemblies are therefore tainted by a significant cost price, and this particularly when the use of noble metals of the stainless metal type is essential.

On connaît également des ensembles chauffants réalisés à l'aide d'opérations de collage, d'agrafage ou de frappe à chaud. Toutes ces opérations présentent l'inconvénient d'être d'une part coûteuses et d'autre part de n'assurer qu'un transfert thermique moins performant.There are also known heating assemblies produced using bonding, stapling or hot stamping operations. All these operations have the disadvantage of being costly on the one hand and on the other hand of ensuring only a less efficient heat transfer.

L'objet de la présente invention consiste donc à réaliser des ensembles chauffants ne présentant pas les inconvénients de l'art antérieur d'une part, et présentant une bonne tenue mécanique dans le temps d'autre part.The object of the present invention therefore consists in producing heating assemblies which do not have the drawbacks of the prior art on the one hand, and which have good mechanical strength over time on the other hand.

Un autre objet de la présente invention vise à fournir des ensembles chauffants présentant d'innombrables propriétés mécaniques et thermiques, ainsi qu'un large éventail de possibilités d'adaptation ou de transformation dudit ensemble chauffant.Another object of the present invention is to provide heating assemblies having innumerable mechanical and thermal properties, as well as a wide range of possibilities for adaptation or transformation of said heating assembly.

Les objets de la présente invention sont atteints à l'aide d'un ensemble chauffant comprenant au moins un élément chauffant blindé comportant un tube métallique fixé sur au moins un support métallique à l'aide d'une couche métallique fusible caractérisé en ce que le matériau constitutif du tube métallique est différent du matériau constitutif du support métallique.The objects of the present invention are achieved using a heating assembly comprising at least one shielded heating element comprising a metal tube fixed to at least one metal support using a fusible metal layer characterized in that the material of the metal tube is different from the material of the metal support.

Les objets de la présente invention sont également atteints à l'aide d'un procédé d'assemblage d'un ensemble chauffant, consistant à lier intimement au moins un élément chauffant blindé avec un support métallique en utilisant une couche de brasure, caractérisé en ce qu'il consiste à procéder à une opération de brasage pour des matériaux constitutifs différents du tube métallique de l'élément chauffant blindé d'une part et du support métallique d'autre part.The objects of the present invention are also achieved by means of a method of assembling a heating assembly, consisting in intimately bonding at least one armored heating element with a metal support using a layer of solder, characterized in that that it consists in carrying out a brazing operation for constituent materials different from the metal tube of the armored heating element on the one hand and of the metal support on the other hand.

D'autres caractéristiques et avantages ressortiront mieux à la lecture de la description donnée ci-après en référence aux dessins annexés, donnés à titre d'exemples, dans lesquels :

  • la figure 1 représente une vue en coupe d'un ensemble chauffant conforme à l'invention.
  • la figure 2 représente une vue en coupe d'une variante de réalisation d'un ensemble chauffant conforme à l'invention.
  • la figure 3 représente une vue en coupe d'une variante supplémentaire de réalisation d'un ensemble chauffant conforme à l'invention.
Other characteristics and advantages will emerge more clearly on reading the description given below with reference to the appended drawings, given by way of examples, in which:
  • Figure 1 shows a sectional view of a heating assembly according to the invention.
  • 2 shows a sectional view of an alternative embodiment of a heating assembly according to the invention.
  • Figure 3 shows a sectional view of an additional alternative embodiment of a heating assembly according to the invention.

La figure 1 représente une vue en coupe de l'assemblage d'un élément chauffant blindé 1, d'un support métallique 3 et d'une couche métallique fusible permettant de réaliser une liaison rigide. L'élément chauffant blindé 1, réalisé de manière connue, est constitué d'un tube métallique à l'intérieur duquel sont agencés un filament résistif et une poudre isolante électrique du type magnésie. L'élément chauffant 1 est avantageusement déformé pour présenter une partie la plane destinée à venir en contact avec le support métallique 3. Le matériau constitutif du tube métallique de l'élément chauffant blindé 1 est, selon l'invention, différent du matériau constitutif du support métallique 3. Ce dernier est de préférence brasé directement sur le support métallique 3 selon une variante de réalisation de l'invention.FIG. 1 represents a sectional view of the assembly of an armored heating element 1, of a metal support 3 and of a fusible metal layer making it possible to produce a rigid connection. The shielded heating element 1, made so known, consists of a metal tube inside which are arranged a resistive filament and an electrical insulating powder of the magnesia type. The heating element 1 is advantageously deformed to present a flat part intended to come into contact with the metal support 3. The material constituting the metal tube of the armored heating element 1 is, according to the invention, different from the material constituting the metal support 3. The latter is preferably brazed directly on the metal support 3 according to an alternative embodiment of the invention.

La couche métallique fusible, dont la température de fusion est inférieure à la température de fusion des éléments constitutifs de l'ensemble chauffant, est de préférence une couche de brasure 2 déposée sur l'un au moins des éléments constitutifs dudit ensemble chauffant.The fusible metal layer, the melting temperature of which is lower than the melting temperature of the constituent elements of the heating assembly, is preferably a solder layer 2 deposited on at least one of the constituent elements of said heating assembly.

La couche de brasure 2, réalisant l'interface entre le support métallique 3 et l'élément chauffant blindé 1, est avantageusement constituée d'une poudre métallique, conductrice thermique et d'un décapant adaptés. La partie la écrasée ou plane de l'élément chauffant blindé 1 permet d'augmenter la surface de contact entre le support métallique 3 et ledit élément chauffant blindé 1.The brazing layer 2, providing the interface between the metal support 3 and the shielded heating element 1, is advantageously made up of a metal powder, heat conductive and of a suitable stripper. The flattened or flat part of the shielded heating element 1 makes it possible to increase the contact surface between the metal support 3 and said shielded heating element 1.

L'ensemble chauffant conforme à l'invention comporte au moins une couche de brasure 2 déposée par tous moyens sur l'un au moins des éléments constitutifs dudit ensemble chauffant. Avantageusement le tube métallique de l'élément chauffant blindé 1 et le support métallique 3 sont respectivement en aluminium et en métal inoxydable. Selon une variante de réalisation de l'ensemble chauffant conforme à l'invention, le tube métallique de l'élément chauffant blindé 1 est en métal inoxydable et le support métallique 3 est en aluminium, ou tout autre matériau conducteur thermique susceptible d'être lié audit élément chauffant blindé 1 par brasure. Le support métallique 3 peut également être constitué d'au moins deux plaques métalliques assemblées par tous moyens et notamment par brasage. Un tel assemblage peut être effectué simultanément à l'opération de brasage de l'élément chauffant blindé 1 sur le support métallique 3. Il est également possible d'assembler par brasage, conformément à l'invention , l'élément chauffant blindé 1 et le support métallique 3, lesquels sont réalisés respectivement en cuivre et en métal inoxydable ou en cuivre et en aluminium.The heating assembly according to the invention comprises at least one brazing layer 2 deposited by any means on at least one of the constituent elements of said heating assembly. Advantageously, the metal tube of the shielded heating element 1 and the metal support 3 are made of aluminum and stainless metal, respectively. According to an alternative embodiment of the heating assembly according to the invention, the metal tube of the shielded heating element 1 is made of stainless metal and the metal support 3 is made of aluminum, or any other thermal conductive material capable of being bonded to said shielded heating element 1 by brazing. The metal support 3 can also consist of at least two metal plates assembled by any means and in particular by brazing. Such an assembly can be carried out simultaneously with the operation of brazing of the shielded heating element 1 on the metal support 3. It is also possible to assemble by brazing, in accordance with the invention, the shielded heating element 1 and the metal support 3, which are made respectively of copper and stainless metal or copper and aluminum.

La figure 2 représente un ensemble chauffant conforme à l'invention comprenant une plaque métallique 3a diffusant l'énergie thermique, d'une part disposée entre l'élément chauffant blindé 1 et le support métallique 3, et d'autre part solidarisée avec ledit élément chauffant blindé 1 et ledit support métallique 3 par l'intermédiaire de couches de brasure 2. Le matériau constitutif de la plaque métallique 3a diffusante permet d'obtenir selon le matériau considéré un gradient de température entre le support métallique 3 et l'élément chauffant blindé 1. Ainsi la plaque métallique 3a est, par exemple, réalisée en aluminium ou en cuivre ou dans un autre matériau permettant de diffuser l'énergie thermique. La plaque métallique 3a peut également, selon une autre variante de réalisation du sous-ensemble chauffant conforme à l'invention, être réalisée dans un matériau identique ou similaire au matériau constitutif de l'élément chauffant blindé 1 ou du support métallique 3. Le gradient de température que l'on peut obtenir avec un support métallique 3 réalisé avec un matériau adéquat est particulièrement intéressant, lorsque ledit support métallique 3, fixé ou maintenu par un bâti, réalisé en matériau plastique ne supportant pas des températures élevées. Le support métallique 3 peut ainsi jouer le rôle de frein thermique. La plaque métallique 3a peut également servir dans diverses applications pour l'ensemble chauffant. Il est ainsi possible d'augmenter l'épaisseur, et par conséquent la rigidité mécanique de l'ensemble chauffant ainsi réalisé et constituer par exemple un fond diffusant thermique pour autocuiseur, pour friteuse ou pour tout autre appareil électroménager. Le support métallique 3 est de préférence réalisé dans un matériau métallique inoxydable ou dans tout autre métal noble lorsqu'il est amené à venir en contact avec des articles alimentaires destinés à être cuits ou chauffés. Ceci est particulièrement le cas des bouilloires électriques ou éventuellement des cafetières électriques. En outre, un support métallique 3 réalisé dans un métal inoxydable retarde l'entartrage et facilite les opérations de nettoyage mécaniques et permet le nettoyage chimique. Un alliage d'acier inoxydable peut également convenir pour réaliser le support métallique 3.2 shows a heating assembly according to the invention comprising a metal plate 3a diffusing the thermal energy, on the one hand disposed between the shielded heating element 1 and the metal support 3, and on the other hand secured to said element armored heater 1 and said metal support 3 by means of brazing layers 2. The material constituting the diffusing metal plate 3a makes it possible to obtain, depending on the material considered, a temperature gradient between the metal support 3 and the armored heating element 1. Thus the metal plate 3a is, for example, made of aluminum or copper or another material allowing the diffusion of thermal energy. According to another alternative embodiment, the metal plate 3a can also be made of a material identical or similar to the material constituting the shielded heating element 1 or the metal support 3. The gradient temperature that can be obtained with a metal support 3 made with a suitable material is particularly advantageous, when said metal support 3, fixed or maintained by a frame, made of plastic material not supporting high temperatures. The metal support 3 can thus play the role of thermal brake. The metal plate 3a can also be used in various applications for the heating assembly. It is thus possible to increase the thickness, and consequently the mechanical rigidity of the heating assembly thus produced and constitute, for example, a thermal diffusing bottom for a pressure cooker, for a fryer or for any other household appliance. The metallic support 3 is preferably made of a stainless metallic material or any other noble metal when it is brought into contact with food articles intended to be cooked or heated. This is particularly the case for electric kettles or possibly electric coffee makers. In addition, a metal support 3 made of stainless metal delays scaling and facilitates mechanical cleaning operations and allows chemical cleaning. A stainless steel alloy may also be suitable for producing the metal support 3.

La figure 3 représente une autre variante de réalisation de l'ensemble chauffant conforme à l'invention, lequel comprend un tube de circulation 5 métallique susceptible de transporter un fluide, ledit tube de circulation 5 étant lié intimement audit ensemble chauffant. Le tube de circulation 5 présente avantageusement une section circulaire et une forme droite, en U ou en fer à cheval. Une autre configuration épousant la forme ou la configuration de l'élément sur lequel il est rapporté est également envisageable. La figure 3 représente une vue en coupe d'un tel ensemble chauffant conforme à l'invention. Le tube de circulation 5 est brasé directement sur l'élément chauffant blindé 1. Ceci est particulièrement le cas pour des chaudières bi-tubes pour machines à café ou machines distributrices de boissons chaudes ou de vapeur. De tels ensembles chauffants sont par exemple constitués d'un élément chauffant blindé 1 en aluminium et d'un tube de circulation 5 réalisé par exemple en acier ou métal inoxydable. L'élément chauffant blindé 1 présente, à cet effet, une déformation épousant au moins partiellement la configuration ou la forme extérieure du tube de circulation 5, de manière à réaliser une grande surface de contact entre le élément chauffant blindé 1 et le tube de circulation 5. La couche de brasure 2 est utilisée comme interface de liaison entre l'élément chauffant blindé 1 et le tube de circulation 5. Un tel ensemble chauffant peut également, selon une autre variante de réalisation conforme à l'invention, être constitué d'un élément chauffant blindé 1 en aluminium ,brasé sur le tube de circulation 5 réalisé également en aluminium, le support métallique 3 étant réalisé par exemple à partir d'un métal inoxydable. Ce dernier est par exemple fixé sur l'ensemble ainsi constitué par une opération de brasage. La rigidité mécanique de l'ensemble chauffant conforme à l'invention est ainsi assurée au moins partiellement par des opérations de brasage.FIG. 3 represents another alternative embodiment of the heating assembly according to the invention, which comprises a metal circulation tube 5 capable of transporting a fluid, said circulation tube 5 being intimately linked to said heating assembly. The circulation tube 5 advantageously has a circular section and a straight, U-shaped or horseshoe shape. Another configuration matching the shape or configuration of the element on which it is attached is also possible. Figure 3 shows a sectional view of such a heating assembly according to the invention. The circulation tube 5 is brazed directly on the armored heating element 1. This is particularly the case for twin-tube boilers for coffee machines or machines for dispensing hot drinks or steam. Such heating assemblies for example consist of an armored heating element 1 made of aluminum and a circulation tube 5 made for example of steel or stainless metal. The shielded heating element 1 has, for this purpose, a deformation matching at least partially the configuration or the external shape of the circulation tube 5, so as to produce a large contact surface between the shielded heating element 1 and the circulation tube 5. The solder layer 2 is used as the connection interface between the shielded heating element 1 and the circulation tube 5. Such a heating assembly can also, according to another alternative embodiment according to the invention, consist of an armored heating element 1 made of aluminum, brazed to the circulation tube 5 also made of aluminum, the metal support 3 being produced for example from a stainless metal. The latter is for example fixed on the assembly thus formed by a brazing operation. The mechanical rigidity of the heating assembly according to the invention is thus ensured at least partially by brazing operations.

Par ailleurs Le tube de circulation 5 peut également être brasé soit sur la plaque métallique diffusante 3a , soit directement sur le support métallique 3.Furthermore, the circulation tube 5 can also be brazed either on the metal diffusing plate 3a, or directly on the metal support 3.

D'autres variantes d'associations de métaux différents par des opérations de brasage sont également envisageables sans sortir du cadre de la présente invention. Les ensembles chauffants conformes à la présente invention trouvent donc leur utilisation ou leur application dans tous types d'appareils électroménagers.Other variants of associations of different metals by brazing operations can also be envisaged without departing from the scope of the present invention. The heating assemblies according to the present invention therefore find their use or their application in all types of household appliances.

L'ensemble chauffant réalisé conformément à l'invention est donc obtenu à partir d'un procédé de fabrication consistant à lier intiment au moins un élément chauffant blindé 1 avec un support métallique 3 en utilisant une couche de brasure 2. Ce procédé d'assemblage consiste également à procéder à une opération de brasage pour des matériaux constitutifs différents du tube métallique de l'élément chauffant blindé 1 d'une part, et du support métallique 3 d'autre part. En outre, le procédé conforme à l'invention consiste à déposer la couche de brasure 2 sur l'une des parties au moins de l'ensemble chauffant au préalable de l'opération d'assemblage desdites parties. Ces dernières sont constituées par exemple par le support métallique 3 et par l'élément chauffant blindé 1. Ce dernier peut avantageusement être déformé à l'aide d'une opération de matriçage par exemple, pour présenter une grande surface de contact avec le support métallique 3 sur lequel il sera rapporté au cours de l'assemblage de l'ensemble chauffant conforme à l'invention. La couche de brasure 2 permet de réaliser une liaison mécanique après une opération de cuisson ou d'étuvage.The heating assembly produced in accordance with the invention is therefore obtained from a manufacturing process consisting in intimately bonding at least one shielded heating element 1 with a metal support 3 using a layer of solder 2. This assembly process also consists in carrying out a brazing operation for different constituent materials of the metal tube of the armored heating element 1 on the one hand, and of the metal support 3 on the other hand. In addition, the method according to the invention consists in depositing the solder layer 2 on at least one of the parts of the heating assembly before the assembly operation of said parts. The latter are constituted for example by the metal support 3 and by the armored heating element 1. The latter can advantageously be deformed using a stamping operation for example, to present a large contact surface with the metal support 3 on which it will be added during the assembly of the heating assembly according to the invention. The brazing layer 2 makes it possible to make a mechanical connection after a cooking or steaming operation.

L'avantage de l'ensemble chauffant conforme à l'invention réside dans l'utilisation d'une quantité limitée de matériaux nobles du type métaux inoxydables. Ainsi le support métallique 3 présente par exemple une épaisseur supérieure ou égale à 0.5 mm. Le support métallique 3 présente de surcroît des propriétés anti-corrosives et résiste à des nettoyages au vinaigre.The advantage of the heating assembly according to the invention lies in the use of a limited quantity of noble materials of the stainless metal type. Thus the metal support 3 has for example a thickness greater than or equal to 0.5 mm. The metal support 3 also has anti-corrosion properties and resists cleaning with vinegar.

Un autre avantage inattendu de l'ensemble chauffant conforme à l'invention est obtenu par une dissipation thermique d'au moins 30 watts par cm2 entre l'élément chauffant blindé 1 et le support métallique 3, n'altérant aucunement la rigidité mécanique de l'assemblage ainsi réalisé.Another unexpected advantage of the heating assembly according to the invention is obtained by a heat dissipation of at least 30 watts per cm 2 between the shielded heating element 1 and the metal support 3, in no way altering the mechanical rigidity of the assembly thus produced.

Un autre avantage de l'ensemble chauffant conforme à l'invention réside dans l'obtention d'un gradient de température avec l'utilisation d'une plaque métallique 3a diffusante 3a et d'un support métallique 3.Another advantage of the heating assembly according to the invention lies in obtaining a temperature gradient with the use of a diffusing metal plate 3a 3a and a metal support 3.

Un avantage complémentaire de l'ensemble chauffant conforme à l'invention réside dans l'obtention d'un fond chauffant de dimension, de poids et de performances thermiques adaptables à convenance.An additional advantage of the heating assembly according to the invention lies in obtaining a heating base of dimension, weight and thermal performance adaptable to suit.

Claims (12)

Ensemble chauffant comprenant au moins un élément chauffant blindé (1) comportant un tube métallique fixé sur au moins un support métallique (3) à l'aide d'une couche métallique fusible caractérisé en ce que le matériau constitutif du tube métallique de l'élément chauffant blindé (1) est différent du matériau constitutif du support métallique (3).Heating assembly comprising at least one shielded heating element (1) comprising a metal tube fixed on at least one metal support (3) using a fusible metal layer characterized in that the material constituting the metal tube of the element armored heater (1) is different from the material of the metal support (3). Ensemble chauffant selon la revendication 1 caractérisé en ce que la couche métallique fusible est une couche de brasure (2) déposée sur l'un au moins des éléments constitutifs dudit ensemble chauffant.Heating assembly according to claim 1 characterized in that the fusible metal layer is a brazing layer (2) deposited on at least one of the constituent elements of said heating assembly. Ensemble chauffant selon la revendication 1 ou 2 caractérisé en ce que le support métallique (3) est constitué d'au moins deux plaques métalliques assemblées par brasage.Heating assembly according to claim 1 or 2 characterized in that the metal support (3) consists of at least two metal plates assembled by brazing. Ensemble chauffant selon l'une des revendications 1 ou 3 caractérisé en ce qu'il comprend une plaque métallique (3a) diffusant l'énergie thermique, d'une part disposée entre l'élément chauffant blindé (1) et le support métallique (3) et d'autre part solidarisée avec ledit élément chauffant blindé (1) et ledit support métallique (3) par l'intermédiaire de couches de brasure (2).Heating assembly according to one of claims 1 or 3 characterized in that it comprises a metal plate (3a) diffusing the thermal energy, on the one hand disposed between the shielded heating element (1) and the metal support (3 ) and on the other hand secured to said shielded heating element (1) and said metal support (3) by means of brazing layers (2). Ensemble chauffant selon l'une des revendications 1 à 4 caractérisé en ce qu'il comprend un tube de circulation métallique (5), susceptible de transporter un fluide, ledit tube de circulation (5) étant lié intimement audit ensemble chauffant.Heating assembly according to one of claims 1 to 4 characterized in that it comprises a metal circulation tube (5), capable of transporting a fluid, said circulation tube (5) being intimately linked to said heating assembly. Ensemble chauffant selon la revendication 5 caractérisé en ce que le tube de circulation (5) est brasé sur la plaque métallique (3a) diffusante.Heating assembly according to claim 5 characterized in that the circulation tube (5) is brazed on the diffusing metal plate (3a). Ensemble chauffant selon la revendication 5 caractérisé en ce que le tube de circulation (5) est brasé sur le support métallique (3).Heating assembly according to claim 5 characterized in that the circulation tube (5) is brazed on the metal support (3). Ensemble chauffant selon la revendication 5 caractérisé en ce que le tube de circulation (5) est brasé sur l'élément chauffant blindé (1).Heating assembly according to claim 5 characterized in that the circulation tube (5) is brazed on the armored heating element (1). Ensemble chauffant selon l'une des revendications à 8 caractérisé en ce que le tube métallique de l'élément chauffant blindé (1) et le support métallique (3) sont respectivement en cuivre et en métal inoxydable.Heating assembly according to one of claims to 8, characterized in that the metal tube of the shielded heating element (1) and the metal support (3) are made of copper and stainless metal respectively. .Ensemble chauffant selon l'une des revendications 1 à 8 caractérisé en ce que le tube métallique de l'élément chauffant blindé (1) et le support métallique (3) sont respectivement en aluminium et en métal inoxydable..Heating assembly according to one of claims 1 to 8 characterized in that the metal tube of the armored heating element (1) and the metal support (3) are respectively of aluminum and of stainless metal. Appareil électroménager comprenant un ensemble chauffant conforme à l'une des revendications 1 à 10.Household appliance comprising a heating assembly according to one of claims 1 to 10. Procédé d'assemblage d'un ensemble chauffant, consistant à lier intimement au moins un élément chauffant blindé (1) avec un support métallique (3) en utilisant une couche de brasure (2), caractérisé en ce qu'il consiste à procéder à une opération de brasage pour des matériaux constitutifs différents du tube métallique de l'élément chauffant blindé (1) d'une part et du support métallique (3) d'autre part.Method of assembling a heating assembly, consisting in intimately bonding at least one shielded heating element (1) with a metal support (3) using a layer of solder (2), characterized in that it consists in carrying out a brazing operation for constituent materials different from the metal tube of the armored heating element (1) on the one hand and of the metal support (3) on the other hand.
EP19960420137 1995-04-19 1996-04-19 Heating element brazed onto a support Revoked EP0739153B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9504941 1995-04-19
FR9504941A FR2733383B1 (en) 1995-04-19 1995-04-19 HEATING ELEMENT ARM ON SUPPORT

Publications (2)

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EP0739153A1 true EP0739153A1 (en) 1996-10-23
EP0739153B1 EP0739153B1 (en) 2003-01-15

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EP19960420137 Revoked EP0739153B1 (en) 1995-04-19 1996-04-19 Heating element brazed onto a support

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EP (1) EP0739153B1 (en)
DE (1) DE69625738T2 (en)
ES (1) ES2189859T3 (en)
FR (1) FR2733383B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2918836A1 (en) * 2007-07-12 2009-01-16 Atlantic Ind Soc Par Actions S HEATING BODY FOR A HEATING APPARATUS, AND APPARATUS FOR HEATING PREMISES INCORPORATING SUCH HEATING BODY

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FR1465590A (en) * 1965-11-30 1967-01-13 Vulcain Hot plates
FR2176901A1 (en) * 1972-03-20 1973-11-02 Gen Electric
JPS5296434A (en) * 1976-02-09 1977-08-13 Furukawa Aluminium Aluminum electric heating plate
FR2453577A2 (en) * 1979-04-05 1980-10-31 Metanic Sa Modification to plate heating element - with reduced diameter of copper sheathed magnesium-oxide packed heating element to facilitate re-mounting
DE3312312A1 (en) * 1983-04-06 1984-10-11 Türk & Hillinger GmbH, 7200 Tuttlingen Electric tubular heating element
DE3347160A1 (en) * 1983-12-27 1985-08-29 Türk & Hillinger GmbH, 7200 Tuttlingen ELECTRIC HEATING DEVICE FOR PLASTIC INJECTION NOZZLES
DE3407965A1 (en) * 1984-03-03 1985-09-05 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen GRILL PLATE
EP0293681A2 (en) * 1987-06-05 1988-12-07 E.G.O. Elektro-Geräte Blanc u. Fischer Heating device with an electrical heating element
DE3830327A1 (en) * 1988-09-07 1990-03-15 Dieter Schanuel Electrically heatable container, such as deep-fat frier, and method for its manufacture
DE9115960U1 (en) * 1991-12-21 1992-05-21 Conti Elektra Heizelemente Gmbh, 6483 Bad Soden-Salmuenster, De

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1465590A (en) * 1965-11-30 1967-01-13 Vulcain Hot plates
FR2176901A1 (en) * 1972-03-20 1973-11-02 Gen Electric
JPS5296434A (en) * 1976-02-09 1977-08-13 Furukawa Aluminium Aluminum electric heating plate
FR2453577A2 (en) * 1979-04-05 1980-10-31 Metanic Sa Modification to plate heating element - with reduced diameter of copper sheathed magnesium-oxide packed heating element to facilitate re-mounting
DE3312312A1 (en) * 1983-04-06 1984-10-11 Türk & Hillinger GmbH, 7200 Tuttlingen Electric tubular heating element
DE3347160A1 (en) * 1983-12-27 1985-08-29 Türk & Hillinger GmbH, 7200 Tuttlingen ELECTRIC HEATING DEVICE FOR PLASTIC INJECTION NOZZLES
DE3407965A1 (en) * 1984-03-03 1985-09-05 E.G.O. Elektro-Geräte Blanc u. Fischer, 7519 Oberderdingen GRILL PLATE
EP0293681A2 (en) * 1987-06-05 1988-12-07 E.G.O. Elektro-Geräte Blanc u. Fischer Heating device with an electrical heating element
DE3830327A1 (en) * 1988-09-07 1990-03-15 Dieter Schanuel Electrically heatable container, such as deep-fat frier, and method for its manufacture
DE9115960U1 (en) * 1991-12-21 1992-05-21 Conti Elektra Heizelemente Gmbh, 6483 Bad Soden-Salmuenster, De

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Title
DATABASE WPI Week 7738, Derwent World Patents Index; AN 77-67914Y, XP002009173 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2918836A1 (en) * 2007-07-12 2009-01-16 Atlantic Ind Soc Par Actions S HEATING BODY FOR A HEATING APPARATUS, AND APPARATUS FOR HEATING PREMISES INCORPORATING SUCH HEATING BODY

Also Published As

Publication number Publication date
ES2189859T3 (en) 2003-07-16
FR2733383A1 (en) 1996-10-25
DE69625738D1 (en) 2003-02-20
DE69625738T2 (en) 2003-10-16
EP0739153B1 (en) 2003-01-15
FR2733383B1 (en) 1997-06-06

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