EP1996893A1 - Heat exchanger and method for manufacturing it - Google Patents

Heat exchanger and method for manufacturing it

Info

Publication number
EP1996893A1
EP1996893A1 EP07731127A EP07731127A EP1996893A1 EP 1996893 A1 EP1996893 A1 EP 1996893A1 EP 07731127 A EP07731127 A EP 07731127A EP 07731127 A EP07731127 A EP 07731127A EP 1996893 A1 EP1996893 A1 EP 1996893A1
Authority
EP
European Patent Office
Prior art keywords
base
fin
edge
parts
exchanger
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.)
Withdrawn
Application number
EP07731127A
Other languages
German (de)
French (fr)
Inventor
Pierre Lecocq
Eric Guyon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferraz Shawmut Thermal Management SAS
Original Assignee
Ferraz Shawmut Thermal Management SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ferraz Shawmut Thermal Management SAS filed Critical Ferraz Shawmut Thermal Management SAS
Publication of EP1996893A1 publication Critical patent/EP1996893A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4871—Bases, plates or heatsinks
    • H01L21/4882—Assembly of heatsink parts
    • 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
    • H01L23/367—Cooling facilitated by shape of device
    • H01L23/3672—Foil-like cooling fins or heat sinks
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/10—Heat sinks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/084—Heat exchange elements made from metals or metal alloys from aluminium or aluminium alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2255/00—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes
    • F28F2255/16—Heat exchanger elements made of materials having special features or resulting from particular manufacturing processes extruded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/12—Fastening; Joining by methods involving deformation of the elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49345—Catalytic device making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making
    • Y10T29/49393—Heat exchanger or boiler making with metallurgical bonding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49936—Surface interlocking

Definitions

  • the invention relates to a method for manufacturing a heat exchanger for cooling at least one electronic power component.
  • the invention also relates to such a heat exchanger.
  • Heat exchangers are conventionally used to avoid damaging heating of electronic power components, such as IGBT ("Insulated Gate Bipolar Transistor” or “Isolated Trigger Bipolar Transistor”) circuits or equivalent materials.
  • IGBT Insulated Gate Bipolar Transistor
  • Isolated Trigger Bipolar Transistor Isolated Trigger Bipolar Transistor
  • a heat exchanger may comprise a plate on which are connected tubes for circulating a heat transfer fluid.
  • such a heat exchanger may also comprise a metal base on which are reported graphite fins, the fins being engaged in grooves machined in the base. Even when a friction fitting is used, the mechanical fastening of these fins is not permanent, in particular since the successive elevations of temperature of the base induce dimensional variations thereof that do not correspond to the evolutions. fins. Thus, the thermal contact between the fins and the base tends to deteriorate over time, which affects the overall efficiency of the exchanger.
  • the invention more particularly intends to remedy by proposing a method of manufacturing an exchanger which allows optimized fixing, in both mechanical and thermal terms, of the fins on the base.
  • the invention relates to a method for manufacturing a heat exchanger for cooling at least one electronic power component, this exchanger comprising a metal base and fins comprising a recompressed expanded graphite part, characterized in that it comprises a step of: a) embedding an edge of at least one fin by crushing, between two distinct parts constituting the base, a deformable portion.
  • the deformable portion is compressed between the two constituent parts of the pack, so that it ensures a mechanical immobilization fin and optimized thermal contact between the base and the fin.
  • such a method can incorporate one or more of the following features:
  • step b) prior to step a) in which the deformable portion is formed by leaving the edge of the fin with a thickness greater than the thickness of the portion of the fin which is intended to protrude by compared to the base.
  • the thickness of the deformable foot is advantageously greater by 20 to 40% relative to the thickness of the portion of the fin which is intended to project relative to the base.
  • step b ' It comprises a step b ') prior to step a) and in which the deformable portion is formed as an independent piece and then this piece is disposed in the vicinity of the edge of the fin between the parts of the base.
  • step b ' it is advantageously formed the deformable portion with a generally U-shaped section able to cap the edge of the fin.
  • the deformable portion is cleaned with a height substantially equal to the height of installation of the fin between the aforementioned parts of one base.
  • the invention also relates to a heat exchanger which can be manufactured by the method mentioned above and, more specifically, to a heat exchanger which comprises a metal base and fins comprising a recompressed expanded graphite part and which is characterized in that this base is formed of several distinct parts between two of which is embedded at least one edge of a fin, a portion being deformed by crushing between these two parts, at the edge of the fin.
  • a heat exchanger which comprises a metal base and fins comprising a recompressed expanded graphite part and which is characterized in that this base is formed of several distinct parts between two of which is embedded at least one edge of a fin, a portion being deformed by crushing between these two parts, at the edge of the fin.
  • such an exchanger may incorporate one or more of the following characteristics:
  • the deformed portion is constituted by the edge of the fin which is integral with the portion of the fin which projects relative to the base;
  • the deformed portion is a part inserted between the edge of the fin and at least one part of the base between which it is embedded;
  • junction areas of two adjacent portions of the base have profiles with slots capable of interlocking into each other, the deformed portion being disposed between two end zones of its profiles.
  • FIG. 1 is a perspective view of a heat exchanger according to the invention equipping two electronic components
  • FIG. 2 is a schematic representation, in side view, of the exchanger of Figure 1 during manufacture
  • FIG. 3 is an enlarged view of detail III in FIG. 2;
  • FIG. 4 is a partial side view of the exchanger of FIG. 1;
  • FIG. 5 is a view similar to FIG. 4 for an exchanger according to a second embodiment of the invention and - Figure 6 is a partial schematic representation, in side view, of the exchanger of Figure 5 during manufacture.
  • the exchanger 1 shown in Figures 1 to 4 comprises a base 11 of generally parallelepiped shape on which are mounted fins 12 for dissipating into the ambient atmosphere calories transmitted to the base 11 by two electronic components 2 and 2 ' mounted on the face 111 of the base 11 opposite the face 112 from which the fins 12 extend.
  • the base 11 is formed by the assembly of extruded aluminum elements 113 which are identical, with the exception of the end elements 113A and 113B.
  • the end members may be the same as the other members 113, in which case the small end faces 116 and 117 of the base 11 are ribbed.
  • the elements 113, 113A and 113B of the base 11 are separate parts which must be assembled together to form this base.
  • the sides of the elements 113 each have a profile with crenellations formed of a succession of grooves 114 and ribs 115 which extend parallel to the end faces 116 and 117 of the base 11 defined respectively by the elements 113A and 113B .
  • the grooves 114 and ribs 115 of the various elements 113 are arranged in such a way that they can nest and jam in the grooves and ribs of an adjacent element 113 when the base 11 is constituted.
  • the crenellated profiles provided on both sides of the same element 113 are complementary to each other over most of the height Hn 3 of each element 113 which extends between the faces 111 and 112.
  • the crenellated profiles are not exactly complementary, such that there remains, after assembly of the base 11 and between two adjacent elements 113, a housing 118 for receiving a foot 121 of a fin 12, this foot constituting the edge of this fin which is immobilized by embedding between the opposite faces 119 and 119 'of two elements 113 whose crenellated profiles cooperate.
  • each element 113 is provided with both a surface 119 and a surface 119 ', these surfaces being distributed on either side of a median plane Pn 3 of this element.
  • the foot 121 has a thickness ei 2 i greater than the thickness e i2 2 of the portion 122 of the fin before the fin 12 is mounted on the base 11. 12 which is provided to protrude beyond the face 112 of the base 11 when the exchanger 1 is mounted.
  • the foot 121 is integral with the part 122.
  • the thickness ei 2 i is 20 to 40% greater than the thickness ei22-
  • the thickness ei 2 i may be of the order of 2 mm, while the thickness e ⁇ 22 is of the order of 1.6 mm.
  • the foot or deformable edge 121 is shaped with the thickness ei2i over a height h 12 i which is substantially equal to the depth Pn 8 of the housing 118 in which it is intended to be inserted, this depth being equal to the height of the surface 119 'taken perpendicular to the faces 111 and 112.
  • Each fin 12 is formed of a core 125 made in a recompressed expanded graphite plate commonly known as "soft graphite", this core being coated with a cladding 123 formed of two metal strips 123A and 123B aluminum arranged against the side faces of the fins 12, these strips imparting to the fin, on the one hand, a good mechanical strength and, on the other hand, a certain flexibility allowing its deformation.
  • the connection between the core 125 and the strips 123A and 123B can be achieved by mechanical anchoring and bonding.
  • the foot 125 of a fin 12 is inserted between the faces 119 and 119 'of each pair of elements 113 facing each other. Then, the base 11 is assembled by exerting on the faces 116 and 117 a clamping force represented by the arrows F 1 in Figure 2, until a complete embedding of the ribs 115 in the grooves 114 corresponding, the housing 118 being thus formed. The base 11 is then maintained in this configuration thanks to the tight nesting of the slots of the elements 113.
  • the base 11 by assembling the elements 113, 113A and 113B, by tightening them with each other, it is immobilized, by compressing it in a housing 118, the foot 121 of each fin 112. crushing of the foot 121 is exerted by the elements 113, 113A or 113B when they are clamped.
  • each leg 121 is deformed by crushing being embedded in the housing 118 corresponding.
  • the depth of the grooves 114 and the height of the ribs 115 are chosen such that the distance due between the facing faces 119 and 119 'of a housing 118 is substantially equal to the thickness ej.22-
  • the thicknesses of the ribs 115 and grooves 114 guarantee, after assembly of the elements 113 thanks to the force Fi, a complete embedding of the ribs 115 in the grooves 114 , which gives the base thus obtained a very rigid and unmountable mechanical structure.
  • the elements 113 can be obtained by extrusion, with manufacturing tolerances that are caught during the mounting of the base 11, by the embedding of the fins 12. No brazing is necessary to permanently immobilize the fins 12 on the base 11, which is entirely favorable given the nature of the core 125 of each fin 12.
  • the thickness ei 2 i may be of the order of 2 mm, while the distance dn 8 is of the order of 1.6 to 1.9 mm. In this case, during the embedding of the foot 121, its thickness is reduced by a value between 5 and 20%.
  • the base 11 is formed by assembling elements 113 of aluminum profile.
  • the fins 12 are formed of a core 125 and a metal cladding 123. They have the same thickness over their entire height.
  • Deformable bearings 124 are provided as structurally independent parts of the parts 11 and 12 of the exchanger 1 before assembly thereof.
  • These parts 124 are in the form of a chute, with a generally U-shaped section allowing them to style a edge 121 of each fin 12, the parts 124 being inserted into the housings 118 defined, as in the first embodiment, in the vicinity of a face 112 of the base 11, between two opposite faces 119 and 119 'each belonging to two different elements 113.
  • the parts 124 here play the same role as the deformable feet 121 of the first embodiment in that they are designed to deform by crushing under the effect of the clamping force exerted for the assembly of the base 11. These parts 124 provide both a mechanical immobilization and excellent thermal contact between the fins 12 and the base 11.
  • the parts 124 may be made of any material adapted to their function, in particular from metal strips, for example copper or aluminum. They are preferably made of recompressed expanded graphite known as "soft graphite", as the core 125 of the fins 12.
  • each piece 124 is at least equal to the depth pus of the housing 118.
  • the fins 12 are immobilized in the housings 118 by compressing the parts 124 at means of the elements 113 and the like, until deforming them.
  • a deformable portion forming part may be arranged on one side of a fin 12 in the corresponding housing 118, namely either on the surface 119 side or on the 119 'surface side corresponding housing 118.
  • a part may be disposed on each side of the portion of the fin 112 embedded in a housing 118, without these two parts being connected by a corresponding portion at the bottom of the U-section shown in FIG. .
  • the wrapping strips can be omitted, the fins then being only graphite.
  • the core 125 or the set of fins 12 in the absence of covering can be made in a mixture comprising graphite and another material, such as a binder.

Abstract

In order to manufacture a heat exchanger comprising a metal base (11) and fins (12) with a part (125) made from recompressed expanded graphite, an edge (121) of at least one fin (12) is inset (Fi) by crushing a deformable portion (121) between two distinct parts (113, 113A, 113B) that make up the base (11). This deformable portion may be an edge (121) of the fin or a part attached in the region of this edge.

Description

ECHANGEUR DE CHALEUR ET SON PROCEDE DE FABRICATION HEAT EXCHANGER AND METHOD FOR MANUFACTURING THE SAME
L'invention a trait à un procédé de fabrication d'un échangeur de chaleur destiné au refroidissement d' au moins un composant électronique de puissance. L'invention a également trait à un tel échangeur de chaleur.The invention relates to a method for manufacturing a heat exchanger for cooling at least one electronic power component. The invention also relates to such a heat exchanger.
Des échangeurs de chaleur sont classiquement utilisés pour éviter un échauffement dommageable de composants électroniques de puissance, tels que des circuits IGBT (« Insulated Gâte Bipolare Transistor » ou « Transistor Bipolaire à Gâchette Isolée ») ou des matériels équivalents. Comme prévu dans FR-A-2 777 986, un tel échangeur de chaleur peut comprendre une plaque sur laquelle sont rapportés des tubes de circulation d'un fluide caloporteur. Comme envisagé dans US-A-2004/0000391 , un tel échangeur de chaleur peut également comprendre une base métallique sur laquelle sont rapportées des ailettes en graphite, les ailettes étant engagées dans des gorges usinées dans l'embase. Même lorsqu'on utilise un ajustage par friction, la fixation mécanique de ces ailettes n'est pas pérenne, notamment dans la mesure où les élévations successives de température de l'embase induisent des variations dimensionnelles de celle-ci qui ne correspondent pas aux évolutions des ailettes. Ainsi, le contact thermique entre les ailettes et l'embase a tendance à se détériorer au cours du temps, ce qui nuit à l'efficacité globale de l' échangeur.Heat exchangers are conventionally used to avoid damaging heating of electronic power components, such as IGBT ("Insulated Gate Bipolar Transistor" or "Isolated Trigger Bipolar Transistor") circuits or equivalent materials. As provided in FR-A-2 777 986, such a heat exchanger may comprise a plate on which are connected tubes for circulating a heat transfer fluid. As envisaged in US-A-2004/0000391, such a heat exchanger may also comprise a metal base on which are reported graphite fins, the fins being engaged in grooves machined in the base. Even when a friction fitting is used, the mechanical fastening of these fins is not permanent, in particular since the successive elevations of temperature of the base induce dimensional variations thereof that do not correspond to the evolutions. fins. Thus, the thermal contact between the fins and the base tends to deteriorate over time, which affects the overall efficiency of the exchanger.
Lors de la réalisation d'un échangeur, qui comprend des ailettes, dont la conductivité thermique exprimée en W/m°C est élevée, ainsi qu'une embase métallique, un problème se pose en ce qui concerne la liaison entre ces divers éléments de nature différente. L'assemblage des ailettes sur l'embase peut être réalisé mécaniquement, avec les inconvénients mentionnés ci-dessus, par brasage ou par collage. Une liaison par brasage garantit un transfert thermique de bonne qualité, ce qui est souhaitable dans les applications où l'on recherche une efficacité de refroidissement maximale. Toutefois, cette solution présente l'inconvénient de nécessiter l'application préalable sur les pièces à assembler de revêtements souvent coûteux au regard des applications envisagées. En outre, la nature de certains matériaux d'ailettes ne permet pas d'envisager de tels traitements et/ou de supporter l'élévation de température résultant du brasage. Une liaison par collage est quelques fois appliquée. Dans ce cas, le gain thermique apporté par le matériau de l'ailette est pour l'essentiel perdu dans la liaison collée où la conductivité thermique des produits utilisés est très faible.When producing an exchanger, which comprises fins, whose thermal conductivity expressed in W / m ° C is high, and a metal base, a problem arises with regard to the connection between these various elements of different nature. The assembly of the fins on the base can be achieved mechanically, with the disadvantages mentioned above, by brazing or by bonding. Solder bonding ensures good heat transfer, which is desirable in applications where maximum cooling efficiency is desired. However, this solution has the disadvantage of requiring the prior application on the parts to be assembled of coatings often expensive with respect to the envisaged applications. In addition, the nature of certain fin materials does not allow to consider such treatments and / or to withstand the temperature rise resulting from soldering. Bonding is sometimes applied. In this case, the heat gain provided by the material of the fin is essentially lost in the bonded bond where the thermal conductivity of the products used is very low.
C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un procédé de fabrication d'un échangeur qui permet une fixation optimisée, tant en termes mécaniques qu'en termes thermiques, des ailettes sur l'embase.It is to these drawbacks that the invention more particularly intends to remedy by proposing a method of manufacturing an exchanger which allows optimized fixing, in both mechanical and thermal terms, of the fins on the base.
A cet effet, l'invention concerne un procédé de fabrication d'un échangeur de chaleur destiné au refroidissement d'au moins un composant électronique de puissance, cet échangeur comprenant une embase métallique ainsi que des ailettes comprenant une partie en graphite expansé recomprimé, caractérisé en ce qu'il comprend une étape consistant à : a) encastrer un bord d'au moins une ailette en écrasant, entre deux parties distinctes constitutives de l'embase, une portion déformable.For this purpose, the invention relates to a method for manufacturing a heat exchanger for cooling at least one electronic power component, this exchanger comprising a metal base and fins comprising a recompressed expanded graphite part, characterized in that it comprises a step of: a) embedding an edge of at least one fin by crushing, between two distinct parts constituting the base, a deformable portion.
Grâce à l'invention, la portion déformable est comprimée entre les deux parties constitutives de l'embas'e, de telle sorte qu'elle assure une immobilisation mécanique de l'ailette ainsi qu'un contact thermique optimisé entre l'embase et l'ailette.Thanks to the invention, the deformable portion is compressed between the two constituent parts of the pack, so that it ensures a mechanical immobilization fin and optimized thermal contact between the base and the fin.
Selon des aspects avantageux mais non obligatoires de l'invention, un tel procédé peut incorporer une ou plusieurs des caractéristiques suivantes :According to advantageous but non-mandatory aspects of the invention, such a method can incorporate one or more of the following features:
- Il comprend une étape b) préalable à l'étape a) dans laquelle on forme la portion déformable en ménageant le bord de l'ailette avec une épaisseur supérieure à l'épaisseur de la partie de cette ailette qui est destinée à faire saillie par rapport à l'embase. Au terme de cette étape b) , l'épaisseur du pied déformable est avantageusement supérieure de 20 à 40% par rapport à l'épaisseur de la partie de l'ailette qui est destinée à faire saillie par rapport à l'embase.- It comprises a step b) prior to step a) in which the deformable portion is formed by leaving the edge of the fin with a thickness greater than the thickness of the portion of the fin which is intended to protrude by compared to the base. At the end of this step b), the thickness of the deformable foot is advantageously greater by 20 to 40% relative to the thickness of the portion of the fin which is intended to project relative to the base.
- Il comprend une étape b' ) préalable à l'étape a) et dans laquelle on forme la portion déformable en tant que pièce indépendante puis on dispose cette pièce au voisinage du bord de l'ailette entre les parties de l'embase. Lors de cette étape b' ) , on forme avantageusement la portion déformable avec une section globalement en U apte à coiffer le bord de l'ailette.- It comprises a step b ') prior to step a) and in which the deformable portion is formed as an independent piece and then this piece is disposed in the vicinity of the edge of the fin between the parts of the base. During this step b '), it is advantageously formed the deformable portion with a generally U-shaped section able to cap the edge of the fin.
- Au cours de l'étape b) ou b' ) , on ménage la portion déformable avec une hauteur sensiblement égale à la hauteur d'encastrement de l'ailette entre les parties précitées de 1' embase .- During step b) or b '), the deformable portion is cleaned with a height substantially equal to the height of installation of the fin between the aforementioned parts of one base.
L' invention concerne également un échangeur de chaleur pouvant être fabriqué grâce au procédé mentionné ci-dessus et, plus spécifiquement, un échangeur qui comprend une embase métallique et des ailettes comprenant une partie en graphite expansé recomprimé et qui est caractérisé en ce que cette embase est formée de plusieurs parties distinctes entre deux desquelles au moins est encastré un bord d'une ailette, une portion étant déformée par écrasement entre ces deux parties, au niveau du bord de l'ailette. Selon des aspects avantageux mais non obligatoires de l'invention, un tel échangeur peut incorporer une ou plusieurs des caractéristiques suivantes :The invention also relates to a heat exchanger which can be manufactured by the method mentioned above and, more specifically, to a heat exchanger which comprises a metal base and fins comprising a recompressed expanded graphite part and which is characterized in that this base is formed of several distinct parts between two of which is embedded at least one edge of a fin, a portion being deformed by crushing between these two parts, at the edge of the fin. According to advantageous but non-compulsory aspects of the invention, such an exchanger may incorporate one or more of the following characteristics:
- La portion déformée est constituée par le bord de l'ailette qui est monobloc avec la partie de l'ailette qui fait saillie par rapport à l'embase ;- The deformed portion is constituted by the edge of the fin which is integral with the portion of the fin which projects relative to the base;
- La portion déformée est une pièce intercalée entre le bord de l'ailette et l'une au moins des parties de l'embase entre lesquelles il est encastré ;- The deformed portion is a part inserted between the edge of the fin and at least one part of the base between which it is embedded;
- Les zones de jonction de deux parties adjacentes de l'embase ont des profils avec des créneaux aptes à s'imbriquer les uns dans les autres, la portion déformée étant disposée entre deux zones d'extrémité de ses profils.- The junction areas of two adjacent portions of the base have profiles with slots capable of interlocking into each other, the deformed portion being disposed between two end zones of its profiles.
L' invention sera mieux comprise et d' autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre de deux modes de réalisation d'un échangeur de chaleur conforme à son principe et de son procédé de fabrication, donnée uniquement à titre d' exemple et faite en référence aux dessins annexés dans lesquels :The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of two embodiments of a heat exchanger according to its principle and its manufacturing method, given only by way of example and with reference to the appended drawings in which:
- la figure 1 est une vue en perspective d' un échangeur de chaleur conforme à l'invention équipant deux composants électroniques ;- Figure 1 is a perspective view of a heat exchanger according to the invention equipping two electronic components;
- la figure 2 est une représentation schématique, en vue de côté, de l' échangeur de la figure 1 en cours de fabrication ;- Figure 2 is a schematic representation, in side view, of the exchanger of Figure 1 during manufacture;
- la figure 3 est une vue à plus grande échelle du détail III à la figure 2 ;FIG. 3 is an enlarged view of detail III in FIG. 2;
- la figure 4 est une vue partielle de côté de 1' échangeur de la figure 1 ;FIG. 4 is a partial side view of the exchanger of FIG. 1;
- la figure 5 est une vue analogue à la figure 4 pour un échangeur conforme à un second mode de réalisation de l'invention et - la figure 6 est une représentation schématique partielle, en vue de côté, de l'échangeur de la figure 5 en cours de fabrication.FIG. 5 is a view similar to FIG. 4 for an exchanger according to a second embodiment of the invention and - Figure 6 is a partial schematic representation, in side view, of the exchanger of Figure 5 during manufacture.
L'échangeur 1 représenté sur les figures 1 à 4 comprend une embase 11 de forme globalement parallélépipédique sur laquelle sont montées des ailettes 12 permettant de dissiper dans l'atmosphère ambiante des calories transmises à l'embase 11 par deux composants électroniques 2 et 2' montés sur la face 111 de l'embase 11 opposée à la face 112 à partir de laquelle s'étendent les ailettes 12.The exchanger 1 shown in Figures 1 to 4 comprises a base 11 of generally parallelepiped shape on which are mounted fins 12 for dissipating into the ambient atmosphere calories transmitted to the base 11 by two electronic components 2 and 2 ' mounted on the face 111 of the base 11 opposite the face 112 from which the fins 12 extend.
L'embase 11 est réalisée par l'assemblage d'éléments en aluminium extrudé 113 qui sont identiques, à l'exception des éléments d'extrémité 113A et 113B. En variante, les éléments d' extrémité peuvent être identiques aux autres éléments 113, auquel cas les petites faces d'extrémité 116 et 117 de l'embase 11 sont nervurées.The base 11 is formed by the assembly of extruded aluminum elements 113 which are identical, with the exception of the end elements 113A and 113B. Alternatively, the end members may be the same as the other members 113, in which case the small end faces 116 and 117 of the base 11 are ribbed.
Les éléments 113, 113A et 113B de l'embase 11 sont des pièces distinctes qui doivent être assemblées ensemble pour former cette embase.The elements 113, 113A and 113B of the base 11 are separate parts which must be assembled together to form this base.
Les côtés des éléments 113 présentent chacun un profil avec des créneaux formés d'une succession de rainures 114 et de nervures 115 qui s'étendent parallèlement aux faces d'extrémité 116 et 117 de l'embase 11 définies respectivement par les éléments 113A et 113B. Les rainures 114 et nervures 115 des différents éléments 113 sont disposées de telle sorte qu'elles peuvent s'imbriquer et se coincer dans les rainures et nervures d'un élément 113 adjacent lorsque est constituée l'embase 11. En d'autres termes, les profils en créneaux prévus sur les deux côtés d'un même élément 113 sont complémentaires l'un de l'autre sur l'essentiel de la hauteur Hn3 de chaque élément 113 qui s'étend entre les faces 111 et 112. Au voisinage de la face 112, les profils en créneaux ne sont pas exactement complémentaires, de telle sorte qu'il subsiste, après assemblage de l'embase 11 et entre deux éléments 113 adjacents, un logement 118 de réception d'un pied 121 d'une ailette 12, ce pied constituant le bord de cette ailette qui est immobilisé par encastrement entre les faces en regard 119 et 119' de deux éléments 113 dont les profils en créneaux coopèrent. En d'autres termes, les surfaces 119 et 119' définissent entre elles un logement 118.The sides of the elements 113 each have a profile with crenellations formed of a succession of grooves 114 and ribs 115 which extend parallel to the end faces 116 and 117 of the base 11 defined respectively by the elements 113A and 113B . The grooves 114 and ribs 115 of the various elements 113 are arranged in such a way that they can nest and jam in the grooves and ribs of an adjacent element 113 when the base 11 is constituted. In other words, the crenellated profiles provided on both sides of the same element 113 are complementary to each other over most of the height Hn 3 of each element 113 which extends between the faces 111 and 112. In the vicinity of the face 112, the crenellated profiles are not exactly complementary, such that there remains, after assembly of the base 11 and between two adjacent elements 113, a housing 118 for receiving a foot 121 of a fin 12, this foot constituting the edge of this fin which is immobilized by embedding between the opposite faces 119 and 119 'of two elements 113 whose crenellated profiles cooperate. In other words, the surfaces 119 and 119 'define between them a housing 118.
A l'exception des éléments 113A et 113B, chaque élément 113 est pourvu à la fois d'une surface 119 et d'une surface 119' , ces surfaces étant réparties de part et d'autre d'un plan médian Pn3 de cet élément.With the exception of the elements 113A and 113B, each element 113 is provided with both a surface 119 and a surface 119 ', these surfaces being distributed on either side of a median plane Pn 3 of this element.
Comme il ressort plus particulièrement de la figure 3, le pied 121 a, avant le montage de l'ailette 12 sur l'embase 11, une épaisseur ei2i supérieure à l'épaisseur ei22 de la partie 122 de l'ailette 12 qui est prévue pour faire saillie au-delà de la face 112 de l'embase 11 lorsque l'échangeur 1 est monté. Le pied 121 est monobloc avec la partie 122. En pratique, l'épaisseur ei2i est supérieure de 20 à 40% par rapport à l'épaisseur ei22- Par exemple, l'épaisseur ei2i peut être de l'ordre de 2 mm, alors que l'épaisseur eχ22 est de l'ordre de 1,6 mm.As is more particularly apparent from FIG. 3, the foot 121 has a thickness ei 2 i greater than the thickness e i2 2 of the portion 122 of the fin before the fin 12 is mounted on the base 11. 12 which is provided to protrude beyond the face 112 of the base 11 when the exchanger 1 is mounted. The foot 121 is integral with the part 122. In practice, the thickness ei 2 i is 20 to 40% greater than the thickness ei22- For example, the thickness ei 2 i may be of the order of 2 mm, while the thickness eχ 22 is of the order of 1.6 mm.
Lors de la fabrication d'une ailette 12, le pied ou bord déformable 121 est conformé avec l'épaisseur ei2i sur une hauteur h12i qui est sensiblement égale à la profondeur Pn8 du logement 118 dans lequel il est destiné à être inséré, cette profondeur étant égale à la hauteur de la surface 119' prise perpendiculairement aux faces 111 et 112.During the manufacture of a fin 12, the foot or deformable edge 121 is shaped with the thickness ei2i over a height h 12 i which is substantially equal to the depth Pn 8 of the housing 118 in which it is intended to be inserted, this depth being equal to the height of the surface 119 'taken perpendicular to the faces 111 and 112.
Chaque ailette 12 est formée d'une âme 125 réalisée dans une plaque en graphite expansé recomprimé communément dénommé « graphite souple », cette âme étant revêtue d'un habillage 123 formé de deux feuillards métalliques en aluminium 123A et 123B disposés contre les faces latérales de l' ailettes 12, ces feuillards conférant à l'ailette, d'une part, une bonne tenue mécanique et, d'autre part, une certaine souplesse permettant sa déformation. La liaison entre l'âme 125 et les feuillards 123A et 123B peut être réalisée par ancrage mécanique et colaminage.Each fin 12 is formed of a core 125 made in a recompressed expanded graphite plate commonly known as "soft graphite", this core being coated with a cladding 123 formed of two metal strips 123A and 123B aluminum arranged against the side faces of the fins 12, these strips imparting to the fin, on the one hand, a good mechanical strength and, on the other hand, a certain flexibility allowing its deformation. The connection between the core 125 and the strips 123A and 123B can be achieved by mechanical anchoring and bonding.
Lors de la fabrication de l'échangeur 1, le pied 125 d'une ailette 12 est inséré entre les faces 119 et 119' de chaque paire d'éléments 113 en regard. Ensuite, l'embase 11 est assemblée en exerçant sur les faces 116 et 117 un effort de bridage représenté par les flèches F1 à la figure 2, jusqu'à obtenir un encastrement complet des nervures 115 dans les rainures 114 correspondantes, les logements 118 étant ainsi formés. L'embase 11 est ensuite maintenue dans cette configuration grâce à l'imbrication serrée des créneaux des éléments 113.During the manufacture of the exchanger 1, the foot 125 of a fin 12 is inserted between the faces 119 and 119 'of each pair of elements 113 facing each other. Then, the base 11 is assembled by exerting on the faces 116 and 117 a clamping force represented by the arrows F 1 in Figure 2, until a complete embedding of the ribs 115 in the grooves 114 corresponding, the housing 118 being thus formed. The base 11 is then maintained in this configuration thanks to the tight nesting of the slots of the elements 113.
Ainsi, en formant l'embase 11 par assemblage des éléments 113, 113A et 113B, en les resserrant les uns avec les autres, on immobilise, en le comprimant dans un logement 118, le pied 121 de chaque ailette 112. L'effort d'écrasement du pied 121 est exercé par les éléments 113, 113A ou 113B lorsqu'ils sont bridés.Thus, by forming the base 11 by assembling the elements 113, 113A and 113B, by tightening them with each other, it is immobilized, by compressing it in a housing 118, the foot 121 of each fin 112. crushing of the foot 121 is exerted by the elements 113, 113A or 113B when they are clamped.
Du fait du resserrement obtenu grâce à l'effort F1, chaque pied 121 est déformé par écrasement en étant encastré dans le logement 118 correspondant. La profondeur des rainures 114 et la hauteur des nervures 115 sont choisies de telle sorte que la distance due entre les faces en regard 119 et 119' d'un logement 118 est sensiblement égale à l'épaisseur ej.22-Due to the tightening obtained by the force F 1 , each leg 121 is deformed by crushing being embedded in the housing 118 corresponding. The depth of the grooves 114 and the height of the ribs 115 are chosen such that the distance due between the facing faces 119 and 119 'of a housing 118 is substantially equal to the thickness ej.22-
Compte tenu de la capacité de l'âme 125 en graphite souple à être comprimée sans casser, le résultat de cet assemblage mécanique entre les ailettes 12 et l'embase 11 au moyen d'un encastrement est un maintien mécanique efficace des différentes ailettes 12 et un contact thermique très satisfaisant entre la base 11 et les ailettes 12.Given the ability of the core 125 of flexible graphite to be compressed without breaking, the result of this mechanical assembly between the fins 12 and the base 11 by means of a recess is a mechanical hold effective of the different fins 12 and a very satisfactory thermal contact between the base 11 and the fins 12.
En pratique, selon un aspect de l'invention qui n'est pas représenté, les épaisseurs des nervures 115 et des rainures 114 garantissent, après assemblage des éléments 113 grâce à l'effort Fi, un encastrement complet des nervures 115 dans les rainures 114, ce qui confère à l'embase ainsi obtenue une structure mécanique très rigide et indémontable.In practice, according to an aspect of the invention which is not shown, the thicknesses of the ribs 115 and grooves 114 guarantee, after assembly of the elements 113 thanks to the force Fi, a complete embedding of the ribs 115 in the grooves 114 , which gives the base thus obtained a very rigid and unmountable mechanical structure.
Les éléments 113 peuvent être obtenus par extrusion, avec des tolérances de fabrication qui sont rattrapées lors du montage de l'embase 11, par l'encastrement des ailettes 12. Aucun brasage n'est nécessaire pour immobiliser définitivement les ailettes 12 sur l'embase 11, ce qui est tout à fait favorable compte tenu de la nature de l'âme 125 de chaque ailette 12.The elements 113 can be obtained by extrusion, with manufacturing tolerances that are caught during the mounting of the base 11, by the embedding of the fins 12. No brazing is necessary to permanently immobilize the fins 12 on the base 11, which is entirely favorable given the nature of the core 125 of each fin 12.
A titre d'exemple, l'épaisseur ei2i peut être de l'ordre de 2 mm, alors que la distance dn8 est de l'ordre de 1,6 à 1,9 mm. Dans ce cas, lors de l'encastrement du pied 121, son épaisseur est réduite d'une valeur comprise entre 5 et 20%.For example, the thickness ei 2 i may be of the order of 2 mm, while the distance dn 8 is of the order of 1.6 to 1.9 mm. In this case, during the embedding of the foot 121, its thickness is reduced by a value between 5 and 20%.
Dans le second mode de réalisation de l'invention représenté aux figures 5 et 6, les éléments analogues à ceux du premier mode de réalisation portent des références identiques. Dans ce mode de réalisation, l'embase 11 est formée par assemblage d'éléments 113 en profilé d'aluminium. Les ailettes 12 sont formées d'une âme 125 et d'un habillage en métal 123. Elles ont la même épaisseur sur toute leur hauteur. Des coussinets déformables 124 sont prévus en tant que pièces structurellement indépendantes des parties 11 et 12 de l'échangeur 1 avant assemblage de celui-ci. Ces pièces 124 sont en forme de goulotte, avec une section globalement en U leur permettant de coiffer un bord 121 de chaque ailette 12, les pièces 124 étant insérées dans des logements 118 définis, comme dans le premier mode de réalisation, au voisinage d'une face 112 de la base 11, entre deux faces en regard 119 et 119' appartenant chacune à deux éléments 113 différents.In the second embodiment of the invention shown in Figures 5 and 6, the elements similar to those of the first embodiment bear identical references. In this embodiment, the base 11 is formed by assembling elements 113 of aluminum profile. The fins 12 are formed of a core 125 and a metal cladding 123. They have the same thickness over their entire height. Deformable bearings 124 are provided as structurally independent parts of the parts 11 and 12 of the exchanger 1 before assembly thereof. These parts 124 are in the form of a chute, with a generally U-shaped section allowing them to style a edge 121 of each fin 12, the parts 124 being inserted into the housings 118 defined, as in the first embodiment, in the vicinity of a face 112 of the base 11, between two opposite faces 119 and 119 'each belonging to two different elements 113.
Les pièces 124 jouent ici le même rôle que les pieds déformables 121 du premier mode de réalisation en ce sens qu'elles sont prévues pour se déformer par écrasement sous l'effet de l'effort de bridage exercé pour l'assemblage de l'embase 11. Ces pièces 124 assurent à la fois une immobilisation mécanique et un excellent contact thermique entre les ailettes 12 et l'embase 11.The parts 124 here play the same role as the deformable feet 121 of the first embodiment in that they are designed to deform by crushing under the effect of the clamping force exerted for the assembly of the base 11. These parts 124 provide both a mechanical immobilization and excellent thermal contact between the fins 12 and the base 11.
Les pièces 124 peuvent être réalisées dans tout matériau adapté à leur fonction, notamment à partir de feuillards métalliques, par exemple en cuivre ou en aluminium. Elles sont de préférence en graphite expansé recomprimé dit « graphite souple », comme l'âme 125 des ailettes 12.The parts 124 may be made of any material adapted to their function, in particular from metal strips, for example copper or aluminum. They are preferably made of recompressed expanded graphite known as "soft graphite", as the core 125 of the fins 12.
On note ei24 l'épaisseur totale d'une pièce 124 avant son insertion entre deux éléments 113. Cette épaisseur est réduite au cours de la fabrication de l'échangeur du fait de la compression obtenue par l'effort de bridage Fi exercé lors de l'assemblage de l'embase 11. Dans ce cas, la distance dus séparant les faces en regard 119 et 119' d'un logement 118 n'est pas égale à l'épaisseur ei22 d'une ailette 12 dans sa partie 122 qui dépasse de l'embase 11 compte tenu de ce que les branches du U formées par chaque pièce 124 conservent une épaisseur non nulle.Note e i2 4 the total thickness of a piece 124 before insertion between two elements 113. This thickness is reduced during the manufacture of the exchanger due to the compression obtained by the clamping force Fi exerted during of the assembly of the base 11. In this case, the distance between the facing faces 119 and 119 'of a housing 118 is not equal to the thickness ei 22 of a fin 12 in its part 122 which protrudes from the base 11 taking into account that the branches of the U formed by each piece 124 retain a non-zero thickness.
La hauteur hχ24 de chaque pièce 124 est au moins égale à la profondeur pus des logements 118.The height hχ 24 of each piece 124 is at least equal to the depth pus of the housing 118.
Ainsi, en formant l'embase 11 par assemblage des parties 113 et équivalentes, on immobilise les ailettes 12 dans les logements 118 en comprimant les pièces 124, au moyen des éléments 113 et équivalents, jusqu'à les déformer .Thus, by forming the base 11 by assembling the parts 113 and the like, the fins 12 are immobilized in the housings 118 by compressing the parts 124 at means of the elements 113 and the like, until deforming them.
Selon une variante non représentée de l'invention, une pièce formant portion déformable peut être disposée sur un seul côté d'une ailette 12 dans le logement 118 correspondant, à savoir soit du côté de la surface 119 soit du côté de la surface 119' du logement 118 correspondant. Selon une autre variante, une pièce peut être disposée de chaque côté de la partie de l'ailette 112 encastrée dans un logement 118, sans que ces deux pièces soient reliées par une partie correspondante au fond de la section en U représenté à la figure 6.According to a not shown variant of the invention, a deformable portion forming part may be arranged on one side of a fin 12 in the corresponding housing 118, namely either on the surface 119 side or on the 119 'surface side corresponding housing 118. According to another variant, a part may be disposed on each side of the portion of the fin 112 embedded in a housing 118, without these two parts being connected by a corresponding portion at the bottom of the U-section shown in FIG. .
Quel que soit le mode de réalisation, l'habillage en feuillards peut être omis, les ailettes étant alors uniquement en graphite.Whatever the embodiment, the wrapping strips can be omitted, the fins then being only graphite.
Selon une autre variante, l'âme 125 ou l'ensemble des ailettes 12 en cas d'absence d'habillage, peut être réalisée dans un mélange comprenant du graphite et un autre matériau, tel qu'un liant. According to another variant, the core 125 or the set of fins 12 in the absence of covering, can be made in a mixture comprising graphite and another material, such as a binder.

Claims

REVENDICATIONS
1. Procédé de fabrication d'un échangeur de chaleur1. Method of manufacturing a heat exchanger
(I) destiné au refroidissement d'au moins un composant électronique de puissance (2, 2'), l' échangeur comprenant une embase métallique (11) et des ailettes (12) comprenant une partie (125) en graphite expansé recomprimé, caractérisé en ce qu'il comprend une étape consistant à : a) encastrer un bord (121) d'au moins une ailette en écrasant (Fi), entre deux parties distinctes (113, 113A, 113B) constitutives de l'embase, une portion déformable (121 ; 124) .(I) for cooling at least one electronic power component (2, 2 '), the exchanger comprising a metal base (11) and fins (12) comprising a recompressed expanded graphite part (125), characterized in that it comprises a step of: a) embedding an edge (121) of at least one crushing fin (Fi), between two distinct parts (113, 113A, 113B) constituting the base, a portion deformable (121; 124).
2. Procédé selon la revendication 1, caractérisé en ce qu'il comprend une étape préalable à l'étape a) dans laquelle : b) on forme la portion déformable en ménageant le bord (121) de l'ailette (12) avec une épaisseur (βi2i) supérieure à l'épaisseur (ei22) de la partie (122) de l'ailette destinée à faire saillie par rapport à l'embase2. Method according to claim 1, characterized in that it comprises a step prior to step a) in which: b) forming the deformable portion by leaving the edge (121) of the fin (12) with a thickness (βi 2 i) greater than the thickness (ei 22 ) of the portion (122) of the fin intended to project relative to the base
(II) .(II).
3. Procédé selon la revendication 2, caractérisé en ce qu'au terme de l'étape b) , l'épaisseur du bord déformable (121) est supérieure de 20 et 40% par rapport à l'épaisseur de la partie (122) de l'ailette destinée à faire saillie par rapport à l'embase (11) .3. Method according to claim 2, characterized in that at the end of step b), the thickness of the deformable edge (121) is 20 and 40% greater than the thickness of the portion (122). the fin intended to project relative to the base (11).
4. Procédé selon la revendication 1, caractérisé en ce qu'il comprend une étape préalable à l'étape a) dans laquelle : b' ) on forme la portion déformable en tant que pièce indépendante (124) puis on dispose cette pièce au voisinage du bord (121) de l'ailette, entre les parties (113) de 1' embase (11) .4. Method according to claim 1, characterized in that it comprises a step prior to step a) in which: b ') the deformable portion is formed as an independent piece (124) and this piece is arranged in the vicinity the edge (121) of the fin between the parts (113) of the base (11).
5. Procédé selon la revendication 4, caractérisé en ce que lors de l'étape b' ) , on forme la portion déformable (124) avec une section globalement en U apte à coiffer le bord (121) de l'ailette (12).5. Method according to claim 4, characterized in that during step b '), the deformable portion is formed (124) with a generally U-shaped section adapted to cap the edge (121) of the fin (12).
6. Procédé selon l'une des revendications 2 à 5, caractérisé en ce qu'au cours de l'étape b) ou b' ) , on ménage la portion déformable (121 ; 124) avec une hauteur6. Method according to one of claims 2 to 5, characterized in that during step b) or b '), the deformable portion (121; 124) is cleaned with a height
(hi2i ; hi24) sensiblement égale à la hauteur d'encastrement (Pue) de l'ailette (12) entre les parties (113) de l'embase(hi2i; hi24) substantially equal to the installation height (Pue) of the fin (12) between the parts (113) of the base
(H) •(H) •
7. Echangeur (1) de chaleur destiné au refroidissement d'au moins un composant électronique de puissance (2, 2'), l'échangeur comprenant une embase métallique (11) et des ailettes (12) comprenant une partie7. Heat exchanger (1) for cooling at least one electronic power component (2, 2 '), the exchanger comprising a metal base (11) and fins (12) comprising a part
(125) en graphite expansé recomprimé, caractérisé en ce que l'embase est formée de plusieurs parties distinctes (113) entre deux desquelles au moins est encastré un bord (121) d'une ailette, une portion (121, 124) étant déformée par écrasement entre ces deux parties de l'embase, au niveau du bord de l'ailette.(125) recompressed expanded graphite, characterized in that the base is formed of several distinct parts (113) between two of which is embedded at least one edge (121) of a fin, a portion (121, 124) being deformed by crushing between these two parts of the base, at the edge of the fin.
8. Echangeur selon la revendication 7, caractérisé en ce que la portion déformée est constituée par le bord (121) de l'ailette (12) qui est monobloc avec une partie (122) de l'ailette faisant saillie par rapport à l'embase (11).8. Exchanger according to claim 7, characterized in that the deformed portion is constituted by the edge (121) of the fin (12) which is integral with a portion (122) of the fin projecting from the base (11).
9. Echangeur selon la revendication 7, caractérisé en ce que la portion déformée est une pièce (124) intercalée entre le bord (121) de l'ailette et l'une au moins des parties (113) de l'embase (11) entre lesquelles est encastré ce bord.9. Exchanger according to claim 7, characterized in that the deformed portion is a part (124) interposed between the edge (121) of the fin and at least one of the parts (113) of the base (11). between which is embedded this edge.
10. Echangeur selon l'une des revendications 7 à 9, caractérisé en ce que les zones de jonctions de deux parties adjacentes de l'embase ont des profils avec des créneaux (114, 115) aptes à s'imbriquer les uns dans les autres, la portion déformée (121 ; 124) étant disposée entre deux zones d'extrémité (119, 119') de ces profils. 10. Exchanger according to one of claims 7 to 9, characterized in that the junction areas of two adjacent portions of the base have profiles with slots (114, 115) adapted to interlock with each other the deformed portion (121; 124) being disposed between two end regions (119, 119 ') of these profiles.
EP07731127A 2006-03-15 2007-03-13 Heat exchanger and method for manufacturing it Withdrawn EP1996893A1 (en)

Applications Claiming Priority (2)

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FR0602277A FR2898668B1 (en) 2006-03-15 2006-03-15 HEAT EXCHANGER FOR COOLING AN ELECTRONIC COMPONENT AND METHOD FOR MANUFACTURING THE SAME
PCT/FR2007/000431 WO2007104857A1 (en) 2006-03-15 2007-03-13 Heat exchanger and method for manufacturing it

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EP1996893A1 true EP1996893A1 (en) 2008-12-03

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WO (1) WO2007104857A1 (en)

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Publication number Publication date
FR2898668B1 (en) 2008-06-27
WO2007104857A1 (en) 2007-09-20
CN101405561A (en) 2009-04-08
FR2898668A1 (en) 2007-09-21
US20090178782A1 (en) 2009-07-16
US8434228B2 (en) 2013-05-07
CN101405561B (en) 2012-02-29

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