WO2011055028A1 - Contact device for improving the heat dissipation of heat-generating apparatuses - Google Patents

Contact device for improving the heat dissipation of heat-generating apparatuses Download PDF

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Publication number
WO2011055028A1
WO2011055028A1 PCT/FR2010/000705 FR2010000705W WO2011055028A1 WO 2011055028 A1 WO2011055028 A1 WO 2011055028A1 FR 2010000705 W FR2010000705 W FR 2010000705W WO 2011055028 A1 WO2011055028 A1 WO 2011055028A1
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WIPO (PCT)
Prior art keywords
foam
contact device
heat
contact
thermal
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PCT/FR2010/000705
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French (fr)
Inventor
Michel Pillet
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A M C Holding
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Publication of WO2011055028A1 publication Critical patent/WO2011055028A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
    • H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
    • H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
    • H01L23/3733—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon having a heterogeneous or anisotropic structure, e.g. powder or fibres in a matrix, wire mesh, porous structures
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • C09K5/14—Solid materials, e.g. powdery or granular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Definitions

  • the present invention relates to devices for improving and increasing the thermal conductance of the contacts between two surfaces and relates in particular to a contact device for improving the heat dissipation of the heat generating devices.
  • appliances such as rectifiers, choppers, dimmers, electrolysis tanks or electric furnaces are subjected to high intensity currents which generate high temperatures.
  • Heat dissipation devices such as radiators are connected to the heat generating apparatus through contact surfaces whose thermal conductance is generally not very high because the deformation of the contacting surfaces over time decreases. the areas of these surfaces actually in contact.
  • the oxidation or fouling of the surfaces in contact greatly reduces the heat exchange capacity.
  • this degradation of the contacting surfaces induces in return an increase in temperatures which accelerates the degradation of the surfaces in contact.
  • the tools used for these resurfacing are generally rotary grinding machines. They degrade the total flatness of the surfaces in contact which has the effect of limiting areas and points of contact. The contact areas being reduced, the contacts then undergo thermal stresses concentrated on these areas and their degradation is even faster.
  • thermal contact greases for the improvement of the thermal conductance.
  • the high-performance products are very expensive and they must be applied in very thin layers to be effective. This makes it difficult to apply and dose them on the contact surfaces.
  • the products have a natural tendency to be expelled from the pressurized assembly for high temperatures.
  • the main object of the invention is to provide a contact device consisting of a heat-conducting foam for improving the thermal conductance of contacts between a heat generating apparatus and a heat dissipating device.
  • the object of the invention is therefore a contact device adapted to improve the thermal conductance between a heat generating apparatus and a heat dissipating device essentially comprising an intermediate thermal conductive element disposed between a contact surface of the generator apparatus. heat and a contact surface of the heat dissipating device.
  • the intermediate thermal conductive element consists of a heat-conducting foam composed of one or more materials, impregnated with grease, such as petroleum jelly, so that to increase the thermal conductance of the foam, the fat completely filling the cells of the foam.
  • Figure 1 schematically shows a heat generating apparatus and a heat dissipating device in contact via a contact device according to the invention
  • Figure 2 schematically shows a contact device according to the invention having a peripheral seal.
  • FIG. 1 schematically illustrates an assembly consisting of a heat generating apparatus 12, a heat dissipating device 14 and a contact device according to the invention formed by an intermediate thermal conducting element 10 placed between a contact surface of the apparatus heat generator 12 and a contact surface of the heat dissipating device 14.
  • the heat generated by the apparatus 12 may be produced by any heat generating source, whether by combustion, chemical reaction or joule effect in electrical apparatus.
  • the heat dissipation device 14 is a device comprising a large surface in contact with the air to obtain maximum heat dissipation. This surface is generally obtained by means of fins 16 illustrated in FIG.
  • the intermediate conductive element 10 used in the device according to the invention is a heat-conducting foam plate made of one or more materials.
  • the element may have a plastic foam structure such as polyurethane on which a deposit of one or more metals has been made which covers the surfaces of the cells of the foam.
  • the metal atoms should cover all the surfaces of the cells of the foam.
  • the thermal conductance of a foam of a first metal such as copper can be improved by depositing a second metal such as nickel or silver on the surface of the first metal.
  • the foam plate can be obtained by electrolysis.
  • the plastic foam plate is made electrically conductive and is used as a cathode in an electrolytic bath, which allows to cover all the surfaces of the cells of the foam by a layer of one or more metals.
  • a second method of obtaining the metal foam plate consists in depositing one or more metals by the vacuum deposition technique.
  • the best method consists of a first step of activation of the foam by chemical deposition of a small metal layer followed by a second electrolysis step during which the metal layer of adequate thickness is deposited by electrolysis.
  • the foam plate obtained according to one of the methods mentioned above can be used as an intermediate thermal conductive element, it may be judicious to use a plate not comprising a plastic material such as polyurethane, but only the foam composed exclusively of metal or metals. To do this, we get rid of the polyurethane skeleton, for example by burning in an oven. The polyurethane burns and disappears, leaving only a foam plate made entirely of metal (or metals).
  • the metals that give the best results for improving the thermal conductance of contact are the most heat-conducting metals such as nickel, silver or copper, these metals can be used alone or in combination, nickel being used preferably.
  • the metal-based foam is preferably used for the practice of the invention, any other conductive foam composed of one or more materials could be used.
  • a graphite foam can be used.
  • the thermal conductance of such a foam can be improved by incorporating metal particles, for example silver, into the cells of the foam.
  • the heat-conducting foam constituting the intermediate thermal conductive element may be partially or completely impregnated (charged) with a stripping or corrosion-inhibiting product, suitable for the materials of the contact surfaces, for example the soda for aluminum or acid for copper.
  • the foam component of the intermediate thermal conductive element may be impregnated (loaded) with grease, for example petroleum jelly so as to increase the thermal conductance of the foam.
  • grease for example petroleum jelly
  • This grease can incorporate antioxidant products and metal particles of a few microns increasing the performance and life of the thermal contact.
  • the particles can be particles of silver, gold or any other good heat conducting metal.
  • the foam load completely fills the cells of the foam, which prevents the penetration of pollutants or agents that can oxidize or degrade the surfaces.
  • the load can be adapted exactly to the materials of the contact surfaces in the presence. If two different materials are in contact, for example aluminum and copper, the charged foam must be adapted to ensure their galvanic protection and to avoid the phenomena of electrolysis. In addition, different fillers can be applied to each side of the foam to adapt exactly to the materials involved.
  • the intermediate thermal conductive element according to the invention is the size of the contact surfaces of the heat generating apparatus 12 and the heat dissipating device 14. It is compressed between the two surfaces by means of screws and nuts clamping devices located at the periphery of the surfaces in contact or at the center of the surfaces, in which case the screw passes through the intermediate element.
  • the intermediate thermal conductive element preferably comprises a seal Peripheral sealing 20.
  • This peripheral seal may be made in different ways. It can be impregnated in the foam or made by the removal of an elastomeric sealant on the periphery. But it is also possible to achieve the seal by folding the edges of the foam plate at least once on itself or by rolling the edges of the foam plate.
  • the peripheral seal 20 makes it possible to reduce the penetration of degrading external agents by creating a tight barrier at the periphery of the contact.
  • the degrading agents are generally liquids such as sodium hydroxide or washing water or any other pollutant product transported by water.
  • the contact device according to the invention provides a multitude of contacts regardless of the geometry of the surfaces and greatly improves the thermal conductance. As a result, the degradation of the contact surface state is markedly slowed down by the decrease of the temperatures generated between the contact surfaces of the heat generating apparatus and the heat dissipating device.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Organic Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The invention relates to a contact device suitable for improving the thermal conductance between a heat-generating apparatus (12) and a heat dissipation device (14), substantially including a heat-conductive intermediate element (10) arranged between a contact surface of the heat-generating apparatus and a contact surface of the heat dissipation device, the heat-conductive intermediate element consisting of a heat-conductive foam consisting of one or more materials and impregnated with grease such as white petroleum jelly, so as to increase the thermal conductance of the foam, the grease completely filling in the cells of the foam.

Description

Dispositif de contact pour améliorer la dissipation thermique des appareils générateurs de chaleur  Contact device for improving heat dissipation of heat generating apparatus
Domaine technique Technical area
La présente invention concerne les dispositifs d'amélioration et d'augmentation de la conductance thermique des contacts entre deux surfaces et concerne en particulier un dispositif de contact pour améliorer la dissipation thermique des appareils générateurs de chaleur.  The present invention relates to devices for improving and increasing the thermal conductance of the contacts between two surfaces and relates in particular to a contact device for improving the heat dissipation of the heat generating devices.
Etat de la technique State of the art
Le milieu industriel est souvent confronté à la dissipation de la chaleur générée par certains appareils. Ainsi, dans le domaine de 1 ' électrotechnique de puissance, les appareils tels que les redresseurs, hacheurs, variateurs, cuves d ' électrolyse ou les fours électriques sont soumis à des courants de haute intensité qui génèrent des températures élevées .  The industrial sector is often confronted with the dissipation of the heat generated by certain devices. Thus, in the field of power electrical engineering, appliances such as rectifiers, choppers, dimmers, electrolysis tanks or electric furnaces are subjected to high intensity currents which generate high temperatures.
Le bon fonctionnement de ces appareils étant directement lié à leur température, il est impératif de les refroidir intensément. En effet, la surchauffe d'un seul composant d'un appareil peut entraîner la destruction de tout l'appareil. C'est pourquoi ces appareils sont généralement fixés sur des radiateurs de dissipation thermique.  Since the proper functioning of these devices is directly related to their temperature, it is imperative to cool them intensely. Indeed, the overheating of a single component of a device can result in the destruction of the entire device. This is why these devices are usually attached to heat sink radiators.
Les dispositifs de dissipation thermique tels que les radiateurs sont reliés à l'appareil générateur de chaleur à travers des surfaces de contacts dont la conductance thermique n'est en général pas très élevée du fait que la déformation des surfaces en contact au cours du temps diminue les aires de ces surfaces réellement en contact. En outre, l'oxydation ou l'encrassement des surfaces en contact diminue fortement la capacité d'échange thermique. En outre, cette dégradation des surfaces en contact induit en retour une augmentation des températures ce qui accélère la dégradation des surfaces en contact . De façon à remédier à la dégradation des contacts, il est nécessaire de les démonter afin de pratiquer un re-surfaçage des zones en contact. Les outils employés pour ces resurfaçages sont en général des disqueuses rotatives. Elles dégradent la planéité totale des surfaces en contact ce qui a pour conséquence de limiter les zones et les points de contact. Les zones de contact étant réduites, les contacts subissent alors des contraintes thermiques concentrées sur ces zones et leur dégradation est encore plus rapide. Heat dissipation devices such as radiators are connected to the heat generating apparatus through contact surfaces whose thermal conductance is generally not very high because the deformation of the contacting surfaces over time decreases. the areas of these surfaces actually in contact. In addition, the oxidation or fouling of the surfaces in contact greatly reduces the heat exchange capacity. In addition, this degradation of the contacting surfaces induces in return an increase in temperatures which accelerates the degradation of the surfaces in contact. In order to remedy the degradation of the contacts, it is necessary to disassemble them in order to re-surf the areas in contact. The tools used for these resurfacing are generally rotary grinding machines. They degrade the total flatness of the surfaces in contact which has the effect of limiting areas and points of contact. The contact areas being reduced, the contacts then undergo thermal stresses concentrated on these areas and their degradation is even faster.
Pour retrouver les surfaces de contact d'origine, le démontage total est nécessaire afin de ré-usiner sur machine les surfaces de contact des appareils de dissipation thermique. Mais cette opération est lourde et coûteuse.  To recover the original contact surfaces, total disassembly is necessary in order to re-machine the contact surfaces of the heat dissipating devices. But this operation is heavy and expensive.
Afin de compenser les défauts géométriques des surfaces de contact dégradées, il existe des graisses de contact thermique pour l'amélioration de la conductance thermique. Mais les produits performants sont très coûteux et ils doivent être appliqués en couches très minces pour être efficaces. Ceci rend difficile leur application et leur dosage sur les surfaces de contact. En outre, les produits ont une tendance naturelle à être expulsés de l'assemblage sous pression pour les températures élevées.  In order to compensate for the geometrical defects of the degraded contact surfaces, there are thermal contact greases for the improvement of the thermal conductance. But the high-performance products are very expensive and they must be applied in very thin layers to be effective. This makes it difficult to apply and dose them on the contact surfaces. In addition, the products have a natural tendency to be expelled from the pressurized assembly for high temperatures.
Le problème posé par la dissipation thermique se pose également dans le domaine électronique où le courant électrique est de faible intensité. En effet, avec la miniaturisation de plus en plus poussée, il est de plus en plus difficile de dissiper la chaleur générée par les composants électroniques tels que les diodes, transistors, résistances ou condensateurs qui occupent des surfaces de plus en plus petites, la quantité de chaleur à dissiper étant faible en valeur absolue mais importante relativement à la surface disponible. En outre, les composants électroniques de puissance perdent beaucoup de capacité avec l'augmentation de température et sont détruits à des températures relativement basses (environ 180°C) par rapport aux températures des circuits. La dégradation de ces composants peut entraîner des accidents industriels graves et de longues immobilisations. Il existe des systèmes de refroidissement par air forcé ou par liquide circulant dans les circuits, mais l'interface entre le composant électronique et le circuit présente une résistance thermique élevée préjudiciable au bon refroidissement du composant . The problem posed by heat dissipation also arises in the electronic field where the electric current is of low intensity. Indeed, with the miniaturization more and more pushed, it is increasingly difficult to dissipate the heat generated by the electronic components such as diodes, transistors, resistors or capacitors that occupy smaller and smaller surfaces, the quantity heat dissipation being low in absolute value but significant relative to the available surface. In addition, the power electronics lose a lot of capacity with increasing temperature and are destroyed at relatively low temperatures (about 180 ° C) relative to the circuit temperatures. Degradation of these components may result in serious industrial accidents and long-term fixed assets. There are systems of cooling by forced air or by liquid circulating in the circuits, but the interface between the electronic component and the circuit has a high thermal resistance detrimental to the good cooling of the component.
Exposé de l' invention Presentation of the invention
C'est pourquoi le but principal de l'invention est de fournir un dispositif de contact constitué d'une mousse conductrice de la chaleur pour améliorer la conductance thermique des contacts entre un appareil générateur de chaleur et un dispositif de dissipation thermique.  Therefore, the main object of the invention is to provide a contact device consisting of a heat-conducting foam for improving the thermal conductance of contacts between a heat generating apparatus and a heat dissipating device.
L'objet de l'invention est donc un dispositif de contact adapté pour améliorer la conductance thermique entre un appareil générateur de chaleur et un dispositif de dissipation thermique comprenant essentiellement un élément conducteur thermique intercalaire disposé entre une surface de contact de l'appareil générateur de chaleur et une surface de contact du dispositif de dissipation thermique. Afin de réduire la résistance thermique entre les surface de contact, l'élément conducteur thermique intercalaire est constitué d'une mousse conductrice de la chaleur composée d'un ou plusieurs matériaux, imprégnée par de la graisse, telle que de la vaseline, de façon à augmenter la conductance thermique de la mousse, la graisse remplissant complètement les alvéoles de la mousse .  The object of the invention is therefore a contact device adapted to improve the thermal conductance between a heat generating apparatus and a heat dissipating device essentially comprising an intermediate thermal conductive element disposed between a contact surface of the generator apparatus. heat and a contact surface of the heat dissipating device. In order to reduce the thermal resistance between the contact surfaces, the intermediate thermal conductive element consists of a heat-conducting foam composed of one or more materials, impregnated with grease, such as petroleum jelly, so that to increase the thermal conductance of the foam, the fat completely filling the cells of the foam.
Description brève des dessins Brief description of the drawings
Les buts, objets et caractéristiques de l'invention apparaîtront plus clairement à la lecture de la description qui suit faite en référence aux dessins dans lesquels :  The objects, objects and features of the invention will appear more clearly on reading the following description given with reference to the drawings in which:
La figure 1 représente de façon schématique un appareil générateur de chaleur et un dispositif de dissipation thermique en contact par l'intermédiaire d'un dispositif de contact selon l'invention ; et la figure 2 représente de façon schématique un dispositif de contact selon l'invention comportant un joint d' étanchéité périphérique . Figure 1 schematically shows a heat generating apparatus and a heat dissipating device in contact via a contact device according to the invention; and Figure 2 schematically shows a contact device according to the invention having a peripheral seal.
Description détaillée de l'invention Detailed description of the invention
La figure 1 illustre schématiquement une ensemble constitué d'un appareil générateur de chaleur 12, un dispositif de dissipation thermique 14 et un dispositif de contact selon l'invention formé par un élément conducteur thermique intercalaire 10 disposé entre une surface de contact de l'appareil générateur de chaleur 12 et une surface de contact du dispositif de dissipation thermique 14.  FIG. 1 schematically illustrates an assembly consisting of a heat generating apparatus 12, a heat dissipating device 14 and a contact device according to the invention formed by an intermediate thermal conducting element 10 placed between a contact surface of the apparatus heat generator 12 and a contact surface of the heat dissipating device 14.
La chaleur générée par l'appareil 12 peut être produite par toute source de production de chaleur, que ce soit par combustion, par réaction chimique ou par effet joule dans les appareils électriques.  The heat generated by the apparatus 12 may be produced by any heat generating source, whether by combustion, chemical reaction or joule effect in electrical apparatus.
Le dispositif de dissipation thermique 14 est un dispositif comprenant une grande surface en contact avec l'air pour obtenir une dissipation maximale des calories. Cette surface est obtenue généralement au moyen d'ailettes 16 illustrées sur la figure 1  The heat dissipation device 14 is a device comprising a large surface in contact with the air to obtain maximum heat dissipation. This surface is generally obtained by means of fins 16 illustrated in FIG.
L'élément conducteur intercalaire 10 utilisé dans le dispositif selon l'invention est une plaque de mousse conductrice de la chaleur constituée d'un ou plusieurs matériaux. Ainsi, l'élément peut avoir une structure de mousse en matière plastique telle que du polyuréthane sur laquelle on a effectué un dépôt d'un ou plusieurs métaux qui vient recouvrir les surfaces des alvéoles de la mousse. L'idéal est que les atomes de métal recouvrent toutes les surfaces des alvéoles de la mousse. Par exemple, on peut améliorer la conductance thermique d'une mousse d'un premier métal tel que le cuivre par la dépose d'un second métal tel que le nickel ou l'argent à la surface du premier métal.  The intermediate conductive element 10 used in the device according to the invention is a heat-conducting foam plate made of one or more materials. Thus, the element may have a plastic foam structure such as polyurethane on which a deposit of one or more metals has been made which covers the surfaces of the cells of the foam. Ideally, the metal atoms should cover all the surfaces of the cells of the foam. For example, the thermal conductance of a foam of a first metal such as copper can be improved by depositing a second metal such as nickel or silver on the surface of the first metal.
L'obtention de la plaque de mousse peut se faire par électrolyse. Dans ce cas, la plaque de mousse de matière plastique est rendue électriquement conductrice et est utilisée comme cathode dans un bain électrolytique, ce qui permet de recouvrir toutes les surfaces des alvéoles de la mousse par une couche d'un ou plusieurs métaux. The foam plate can be obtained by electrolysis. In this case, the plastic foam plate is made electrically conductive and is used as a cathode in an electrolytic bath, which allows to cover all the surfaces of the cells of the foam by a layer of one or more metals.
Une deuxième méthode d'obtention de la plaque de mousse métallique consiste à déposer un ou des métaux par la technique du dépôt sous vide.  A second method of obtaining the metal foam plate consists in depositing one or more metals by the vacuum deposition technique.
Mais la meilleure méthode consiste en une première étape d'activation de la mousse par dépôt chimique d'une faible couche métallique suivie d'une seconde étape d' électrolyse pendant laquelle la couche métallique d'épaisseur adéquate est déposée par électrolyse.  But the best method consists of a first step of activation of the foam by chemical deposition of a small metal layer followed by a second electrolysis step during which the metal layer of adequate thickness is deposited by electrolysis.
Bien que la plaque de mousse obtenue selon l'une des méthodes mentionnées ci-dessus peut être utilisée comme élément conducteur thermique intercalaire, il peut être judicieux d'utiliser une plaque ne comportant pas de matière plastique telle que du polyuréthane , mais seulement la mousse composée exclusivement de métal ou de métaux. Pour ce faire, on se débarrasse du squelette de polyuréthane, par exemple par brûlage dans un four. Le polyuréthane brûle et disparait, ne laissant qu'une plaque de mousse constituée entièrement de métal (ou de métaux) .  Although the foam plate obtained according to one of the methods mentioned above can be used as an intermediate thermal conductive element, it may be judicious to use a plate not comprising a plastic material such as polyurethane, but only the foam composed exclusively of metal or metals. To do this, we get rid of the polyurethane skeleton, for example by burning in an oven. The polyurethane burns and disappears, leaving only a foam plate made entirely of metal (or metals).
Bien que tout métal peut être utilisé pour constituer la plaque, les métaux qui donnent les meilleurs résultats pour l'amélioration de la conductance thermique de contact sont les métaux les plus conducteurs de la chaleur tels que le nickel, l'argent ou le cuivre, ces métaux pouvant être utilisés seuls ou en combinaison, le nickel étant utilisé de préférence.  Although any metal can be used to form the plate, the metals that give the best results for improving the thermal conductance of contact are the most heat-conducting metals such as nickel, silver or copper, these metals can be used alone or in combination, nickel being used preferably.
Bien que la mousse à base de métaux soit utilisée de préférence pour la mise en oeuvre de l'invention, tout autre mousse conductrice composée d'un ou plusieurs matériaux pourrait être utilisée. On peut par exemple utiliser une mousse de graphite. La conductance thermique d'une telle mousse peut être améliorée en incorporant des particules de métal, par exemple de l'argent, dans les alvéoles de la mousse . Selon une variante de réalisation, la mousse conductrice de la chaleur composant l'élément conducteur thermique intercalaire peut être partiellement ou complètement imprégnée (chargée) d'un produit décapant ou inhibant la corrosion, adapté aux matériaux des surfaces de contact, par exemple de la soude pour l'aluminium ou de l'acide pour le cuivre. Although the metal-based foam is preferably used for the practice of the invention, any other conductive foam composed of one or more materials could be used. For example, a graphite foam can be used. The thermal conductance of such a foam can be improved by incorporating metal particles, for example silver, into the cells of the foam. According to an alternative embodiment, the heat-conducting foam constituting the intermediate thermal conductive element may be partially or completely impregnated (charged) with a stripping or corrosion-inhibiting product, suitable for the materials of the contact surfaces, for example the soda for aluminum or acid for copper.
Selon une autre variante de réalisation, la mousse composant l'élément conducteur thermique intercalaire peut être imprégnée (chargée) par de la graisse, par exemple de la vaseline de façon à augmenter la conductance thermique de la mousse. Cette graisse peut incorporer des produits d' antioxydation et des particules métalliques de quelques microns augmentant la performance et la durée de vie du contact thermique. Les particules peuvent être des particules d'argent, d'or ou tout autre métal bon conducteur de la chaleur.  According to another embodiment, the foam component of the intermediate thermal conductive element may be impregnated (loaded) with grease, for example petroleum jelly so as to increase the thermal conductance of the foam. This grease can incorporate antioxidant products and metal particles of a few microns increasing the performance and life of the thermal contact. The particles can be particles of silver, gold or any other good heat conducting metal.
Dans les deux variantes mentionnées ci-dessus, la charge de la mousse remplit complètement les alvéoles de la mousse, ce qui empêche la pénétration de polluants ou d' agents susceptibles d'oxyder ou de dégrader les surfaces.  In both variants mentioned above, the foam load completely fills the cells of the foam, which prevents the penetration of pollutants or agents that can oxidize or degrade the surfaces.
A noter que la charge peut être adaptée exactement aux matériaux des surfaces de contact en présence. Si deux matériaux différents sont en contact, par exemple de l'aluminium et du cuivre, la mousse chargée doit être adaptée pour assurer leur protection galvanique et éviter les phénomènes d' électrolyse . En outre, des charges différentes peuvent être appliquées sur chaque côté de la mousse afin de les adapter exactement aux matériaux en présence.  Note that the load can be adapted exactly to the materials of the contact surfaces in the presence. If two different materials are in contact, for example aluminum and copper, the charged foam must be adapted to ensure their galvanic protection and to avoid the phenomena of electrolysis. In addition, different fillers can be applied to each side of the foam to adapt exactly to the materials involved.
De préférence, l'élément conducteur thermique intercalaire selon l'invention est de la taille des surfaces de contact de l'appareil générateur de chaleur 12 et du dispositif de dissipation thermique 14. Il est comprimé entre les deux surfaces au moyen de vis et écrous de serrage situés à la périphérie des surfaces en contact ou au centre des surfaces, auquel cas, la vis traverse l'élément intercalaire.  Preferably, the intermediate thermal conductive element according to the invention is the size of the contact surfaces of the heat generating apparatus 12 and the heat dissipating device 14. It is compressed between the two surfaces by means of screws and nuts clamping devices located at the periphery of the surfaces in contact or at the center of the surfaces, in which case the screw passes through the intermediate element.
Comme illustré sur la figure 2, l'élément conducteur thermique intercalaire comporte de préférence un joint d'étanchéité périphérique 20. Ce joint d'étanchéité périphérique peut être réalisé de différentes façons. Il peut être imprégné dans la mousse ou bien réalisé par la dépose d'un produit d'étanchéité de type élastomère sur la périphérie. Mais il est également possible de réaliser le joint en repliant les bords de la plaque de mousse au moins une fois sur elle-même ou bien en roulant les bords de la plaque de mousse. As illustrated in FIG. 2, the intermediate thermal conductive element preferably comprises a seal Peripheral sealing 20. This peripheral seal may be made in different ways. It can be impregnated in the foam or made by the removal of an elastomeric sealant on the periphery. But it is also possible to achieve the seal by folding the edges of the foam plate at least once on itself or by rolling the edges of the foam plate.
Le joint d'étanchéité périphérique 20 permet de réduire la pénétration d'agents extérieurs dégradants en créant une barrière étanche à la périphérie du contact. En effet, et en particulier dans le cas des cuves d ' électrolyse chlore soude, les agents dégradants sont généralement des liquides tels que de la soude ou de l'eau de lavage ou bien tout autre produit polluant transporté par l'eau.  The peripheral seal 20 makes it possible to reduce the penetration of degrading external agents by creating a tight barrier at the periphery of the contact. Indeed, and in particular in the case of sodium chlorine electrolysis tanks, the degrading agents are generally liquids such as sodium hydroxide or washing water or any other pollutant product transported by water.
En résumé, en utilisant une plaque de mousse conductrice de la chaleur comprimée entre les deux surfaces en contact, le dispositif de contact selon l'invention assure une multitude de contacts indépendamment de la géométrie des surfaces et améliore énormément la conductance thermique. En conséquence, la dégradation de l'état de surface de contact est nettement ralentie grâce à la diminution des températures engendrées entre les surfaces de contact de l'appareil générateur de chaleur et du dispositif de dissipation thermique.  In summary, by using a heat conductive foam plate compressed between the two surfaces in contact, the contact device according to the invention provides a multitude of contacts regardless of the geometry of the surfaces and greatly improves the thermal conductance. As a result, the degradation of the contact surface state is markedly slowed down by the decrease of the temperatures generated between the contact surfaces of the heat generating apparatus and the heat dissipating device.

Claims

REVENDICATIONS
1. Dispositif de contact adapté pour améliorer la conductance thermique entre un appareil générateur de chaleur (12) et un dispositif de dissipation thermique (14) comprenant essentiellement un élément conducteur thermique intercalaire (10) disposé entre une surface de contact dudit appareil générateur de chaleur et une surface de contact dudit dispositif de dissipation thermique, ledit élément conducteur thermique intercalaire étant constitué d'une mousse conductrice de la chaleur composée d'un ou plusieurs matériaux, afin de réduire la résistance thermique entre lesdites surface de contact A contact device adapted to improve the thermal conductance between a heat generating apparatus (12) and a heat dissipating device (14) essentially comprising a thermal interleaving element (10) disposed between a contact surface of said heat generating apparatus and a contact surface of said heat dissipating device, said interleaved thermal conductive element being made of a heat conductive foam composed of one or more materials, to reduce thermal resistance between said contact surface
ledit dispositif de contact étant caractérisé en ce que la mousse conductrice de la chaleur est imprégnée par de la graisse, telle que de la vaseline, de façon à augmenter la conductance thermique de ladite mousse, ladite graisse remplissant complètement les alvéoles de ladite mousse.  said contact device being characterized in that the heat conductive foam is impregnated with grease, such as petroleum jelly, so as to increase the thermal conductance of said foam, said grease completely filling the cells of said foam.
2. Dispositif de contact selon la revendication 1, dans lequel ladite graisse incorpore des produits d' anti-oxydation et des particules métalliques de quelques microns de façon à augmenter la performance et la durée de vie du dispositif de contact . 2. Contact device according to claim 1, wherein said grease incorporates anti-oxidation products and metal particles of a few microns so as to increase the performance and life of the contact device.
3. Dispositif de contact selon la revendication 1 ou 2, dans lequel ledit élément conducteur thermique intercalaire (10) est constitué d'une mousse métallique comprenant au moins un métal. Contact device according to claim 1 or 2, wherein said intermediate thermal conductive element (10) consists of a metal foam comprising at least one metal.
4. Dispositif de contact selon la revendication 3, dans lequel ladite mousse comprend un squelette en matière plastique telle que du polyuréthane dont les surfaces des alvéoles sont recouvertes par un ou plusieurs métaux. 4. Contact device according to claim 3, wherein said foam comprises a plastic skeleton such as polyurethane whose cell surfaces are covered by one or more metals.
5. Dispositif de contact selon la revendication 4, dans lequel ledit squelette en matière plastique a été retiré, ladite mousse étant composée exclusivement d'un ou plusieurs métaux. The contact device according to claim 4, wherein said plastic skeleton has been removed, said foam being composed exclusively of one or more metals.
6. Dispositif de contact selon l'une des revendications 2 à 5, dans lequel ladite mousse métallique comprend un ou plusieurs métaux choisis dans le groupe comprenant le cuivre, l'argent et le nickel. The contact device according to one of claims 2 to 5, wherein said metal foam comprises one or more metals selected from the group consisting of copper, silver and nickel.
7. Dispositif de contact selon la revendication 6, dans lequel ladite mousse métallique comprend seulement du nickel. The contact device of claim 6, wherein said metal foam comprises only nickel.
8. Dispositif de contact selon l'une des revendications précédentes, dans lequel l'élément conducteur thermique intercalaire (10) comporte un joint d'étanchéité périphérique (20) permettant de réduire la pénétration d'agents extérieurs dégradants en créant une barrière étanche à la périphérie dudit élément intercalaire. 8. Contact device according to one of the preceding claims, wherein the intermediate thermal conductive element (10) comprises a peripheral seal (20) to reduce the penetration of degrading external agents by creating a waterproof barrier to the periphery of said intermediate element.
9. Dispositif' de contact selon la revendication 8, dans lequel ledit joint d'étanchéité périphérique est formé par le" repli des bords dudit élément conducteur thermique intercalaire (10). 9. The contact device of claim 8, wherein said peripheral seal is formed by " bending the edges of said interposed thermal conductive member (10).
PCT/FR2010/000705 2009-11-09 2010-10-27 Contact device for improving the heat dissipation of heat-generating apparatuses WO2011055028A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0905377 2009-11-09
FR0905377A FR2952377B1 (en) 2009-11-09 2009-11-09 CONTACT DEVICE FOR IMPROVING THERMAL DISSIPATION OF HEAT GENERATING DEVICES

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FR2952377B1 (en) 2012-05-04

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