EP0504034B1 - Heat exchanger with connected water boxes for cars - Google Patents

Heat exchanger with connected water boxes for cars Download PDF

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Publication number
EP0504034B1
EP0504034B1 EP92400612A EP92400612A EP0504034B1 EP 0504034 B1 EP0504034 B1 EP 0504034B1 EP 92400612 A EP92400612 A EP 92400612A EP 92400612 A EP92400612 A EP 92400612A EP 0504034 B1 EP0504034 B1 EP 0504034B1
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EP
European Patent Office
Prior art keywords
heat exchanger
headers
end portion
self
water
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.)
Revoked
Application number
EP92400612A
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German (de)
French (fr)
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EP0504034A1 (en
Inventor
Dany Boquel
Bernard Levy
Norman Golm
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Valeo Thermique Moteur SA
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Valeo Thermique Moteur SA
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Application filed by Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP0504034A1 publication Critical patent/EP0504034A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core

Definitions

  • the invention relates to a heat exchanger with connected water boxes for motor vehicles, in particular for heavy goods vehicles.
  • Heat exchangers of this type comprise a bundle of tubes mounted between two water boxes, each of which is delimited by a wall of molded plastic material having two opposite lateral faces on which two uprights of shaped cross section are fixed. of U connecting the two water boxes and framing the beam, each of the uprights comprising a core on which two lateral cheeks depend.
  • the two uprights which connect the water boxes then give such a heat exchanger high mechanical strength, which makes it possible to produce it in large dimensions and to mount it on a motor vehicle, in particular a heavy vehicle, where it must be subjected. in operation at high mechanical stresses due in particular to the vibrations of the motor and to the differences in expansion undergone by the tubes of the bundle.
  • the object of the invention is in particular to remedy the aforementioned drawbacks.
  • a heat exchanger of the type defined in the introduction comprising a bundle of tubes mounted between two water boxes, each of which is delimited by a wall of molded plastic material having two opposite lateral faces on which two are fixed.
  • U-shaped uprights connecting the two water boxes and framing the beam, each of the uprights comprising a core on which two lateral cheeks depend characterized in that each of the opposite lateral faces of the water boxes carry smooth-wall bores, the l the axis extends substantially perpendicular to the plane of said opposite lateral faces, in that said bores are formed in bosses formed in the wall of water boxes and in that said bores are capable of receiving a self-tapping screw which passes through a opening in a cheek of the uprights so as to ensure the fixing of said cheek on the wall side of the water box.
  • each upright comprises, in a manner known per se, an end provided with circular openings for rigid attachment to one of the two water boxes and a end provided with oblong openings for sliding attachment to the other water box, so as to compensate for variations in expansion.
  • tapping screws of the same type can be used both for rigid attachment of an upright on a water box and for sliding attachment of the upright on the other water box.
  • the ring can be an integral part of the self-tapping screw or else be threaded around the latter.
  • each of the lateral cheeks of an upright comprises an end connected by a recess, which allows this end to bear flat against the corresponding face of the water box.
  • each of the side cheeks has one end in its extension so that this end is supported on a face offset from the face of the water box.
  • each of the blind bores is formed in a boss formed in the wall of the water box.
  • the heat exchanger shown in FIGS. 1 and 2 comprises a bundle 10 which is formed from a multiplicity of tubes 12 passing through fins 14 and which is mounted between two water boxes 16 and 18.
  • the water box 16 placed in the upper part of the heat exchanger comprises a collecting plate 20 also called a "hole plate", into which the ends of the tubes 12 of the bundle open.
  • a collecting plate 20 also called a "hole plate”
  • On the periphery of the collecting plate 20 is fixed a wall 22 of molded plastic which delimits the water box 16.
  • This wall comprises an inlet pipe 24 and a degassing pipe 26.
  • the water box 18, placed in the lower part, comprises a collecting plate 28 into which the other ends of the tubes 12 open as well as a molded plastic wall, into which an outlet pipe 32 and a drain pipe 34 are formed. .
  • the two water boxes 16 and 18 are interconnected by two uprights 36, of U-shaped cross section, comprising a core 38 on which two lateral cheeks 40 depend.
  • Each of the two cheeks 40 comprises one end 42, of generally triangular shape , intended to be fixed to the water box 16 and an opposite end 44, of generally triangular shape, intended to be fixed to the water box 18.
  • Each of the ends 42 or 44 is fixed to the corresponding water box by the at least one self-tapping screw 46.
  • each of the uprights is fixed to one of the two water boxes by means of four self-tapping screws 46, which represents a total of 16 self-tapping screws for the heat exchanger.
  • the two uprights 36 thus frame the bundle 10.
  • the uprights 36 are also connected together, substantially at mid-height, by at least one tie rod 48, here two tie rods, extending transversely to the direction of the tubes 12 of the bundle.
  • each of the cheeks 40 of an upright 36 comprises a step 50 connecting it to its end 42 and another step 52 connecting it to its end 44.
  • the two ends 42 and 44 can thus be applied to flat against the water boxes 16 and 18 respectively, bypassing the protuberances formed by the collecting plates 20 and 28.
  • the wall 22 of the water box 16 comprises two opposite faces 54, substantially parallel to each other, on which are fixed respectively the two ends 42 of an upright 36 and, correspondingly, the wall 30 of the water box 18 comprises two opposite faces 56 parallel to each other, on which are fixed respectively the two ends 44 of the same amount.
  • Each of the ends 42 (FIGS. 3, 5 and 6) is provided with two openings 58 of generally oblong shape, while each of the ends 44 is provided with two openings 60 of circular shape, to allow rigid fixing of each upright 36 on the water box 18 and a sliding attachment of each upright 36 on the water box 16.
  • each of the oblong openings 58 has a width l greater than the diameter d of circular openings 60 and a length L greater than the width l and extending in the direction of the length of the upright, to allow a clearance mutual of the two water boxes under the effect of the differences in expansion presented by the tubes 12 of the bundle as a function of the temperature of the fluid passing through them.
  • each of the opposite faces 54 of the water box 16 and in each of the opposite faces 56 of the water box 18 are formed bores 62 with smooth walls, which in the example are blind, and whose axis of each d 'them extends perpendicular to the plane of the corresponding flat face 54 or 56.
  • the bores 62 have come from molding with the corresponding water box and are formed in bosses 64 formed in the wall 22 of the water box 16 or in the wall 30 of the water box 18.
  • the self-tapping screw 46 shown in FIG. 7 successively comprises a threaded rod 66, a ring 68 in the form of a flange having an outside diameter D and a height h, a washer 70 with a diameter greater than D and finally a hexagonal head 72.
  • the diameter D of the ring 68 is greater than the diameter d of an opening 60 and less than the width l of an opening 58. Its height h is greater than the thickness e of the end 42 or 44 of a cheek 40.
  • the ring 68 of a screw 46 presses against the end 44 around an opening 60 and thus ensures the tightening of this end 44 on a face 56 of the water box 18.
  • the ring 68 instead of being an integral part of the self-tapping screw 46, is simply threaded on the latter.
  • the bores 62 can be obtained by molding with the two water boxes and that the self-tapping screws 46 are introduced by simple screwing in force in the bores 62, the mounting and fixing of the uprights 36 are much simpler to realize that in the case of heat exchangers of the prior art.
  • each of the cheeks 40 does not include an offset 50.
  • the end 42 is located in the extension of the cheek 40, while that the faces of the bores 62 facing the end are located beyond the face of the wall 54 or 56 of the water box.
  • the lateral cheeks 40 are no longer supported on the faces of the water boxes but on the projecting end of the bosses 62.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Description

L'invention concerne un échangeur de chaleur à boîtes à eau reliées pour véhicules automobiles, en particulier pour poids lourds.The invention relates to a heat exchanger with connected water boxes for motor vehicles, in particular for heavy goods vehicles.

On connaît déjà des échangeurs de chaleur de ce type qui comprennent un faisceau de tubes monté entre deux boîtes à eau, dont chacune est délimitée par une paroi en matière plastique moulée présentant deux faces latérales opposées sur lesquelles sont fixés deux montants à section transversale en forme de U reliant les deux boîtes à eau et encadrant le faisceau, chacun des montants comprenant une âme dont dépendent deux joues latérales.Heat exchangers of this type are already known which comprise a bundle of tubes mounted between two water boxes, each of which is delimited by a wall of molded plastic material having two opposite lateral faces on which two uprights of shaped cross section are fixed. of U connecting the two water boxes and framing the beam, each of the uprights comprising a core on which two lateral cheeks depend.

Les deux montants gui relient les boîtes à eau confèrent alors à un tel échangeur de chaleur une résistance mécanique élevée, ce qui permet de le réaliser en grande dimension et de le monter sur un véhicule automobile, notamment un poids lourd, où il doit être soumis en fonctionnement à des contraintes mécaniques élevées dûes notamment aux vibrations du moteur et aux différences de dilatation subies par les tubes du faisceau.The two uprights which connect the water boxes then give such a heat exchanger high mechanical strength, which makes it possible to produce it in large dimensions and to mount it on a motor vehicle, in particular a heavy vehicle, where it must be subjected. in operation at high mechanical stresses due in particular to the vibrations of the motor and to the differences in expansion undergone by the tubes of the bundle.

Il est connu, d'après le Brevet européen No 115 795, de réaliser un tel échangeur de chaleur dans lequel la fixation de chacun des montants sur chacune des boîtes à eau s'effectue au moyen d'au moins une goupille oui traverse de part en part la boîte à eau et qui passe à travers deux ouvertures ménagées dans les deux joues latérales en vis-à-vis du montant.It is known, according to European Patent No 115,795, to produce such a heat exchanger in which the fixing of each of the uprights on each of the water boxes is effected by means of at least one pin yes cross through apart the water box and which passes through two openings in the two side cheeks opposite the upright.

La mise en place de telles goupilles est complexe et coûteuse à réaliser.The installation of such pins is complex and costly to carry out.

Il est connu aussi, d'après le Brevet européen No 112 251, de réaliser un échangeur de chaleur d'un type voisin, dans lequel les boîtes à eau sont formées d'une matière métallique moulée, et dans lequel la fixation de chacune des joues d'un montant sur une face latérale d'une boîte à eau s'effectue au moyen d'au moins un boulon qui traverse une ouverture de la joue et qui est vissé dans un trou taraudé prévu à cet effet dans l'épaisseur de la paroi de la boîte à eau.It is also known, according to European Patent No. 112,251, to produce a heat exchanger of a similar type, in which the water boxes are formed from a molded metallic material, and in which the fixing of each of the cheeks of an upright on a lateral face of a water box is effected by means of at least one bolt which passes through an opening of the cheek and which is screwed into a tapped hole provided for this purpose in the thickness of the wall of the water box.

Là encore, l'opération de fixation est longue et coûteuse à réaliser car elle nécessite deux usinages successifs de chaque boîte à eau pour y former d'abord plusieurs trous et ensuite des taraudages appropriés.Again, the fixing operation is long and expensive to perform because it requires two successive machining of each water box to first form several holes and then appropriate tapping.

L'invention a notamment pour but de remédier aux inconvénients précités.The object of the invention is in particular to remedy the aforementioned drawbacks.

Elle propose, à cet effet, un échangeur de chaleur du type défini en introduction, comprenant un faisceau de tubes monté entre deux boîtes à eau, dont chacune est délimitée par une paroi en matière plastique moulée présentant deux faces latérales opposées sur lesquelles sont fixés deux montants à section transversale en U reliant les deux boîtes à eau et encadrant le faisceau, chacun des montants comprenant une âme dont dépendent deux joues latérales, caractérisé en ce que chacune des faces latérales opposées des boîtes à eau portent des alésages à paroi lisse dont l'axe s'étend sensiblement perpendiculairement au plan desdites faces latérales opposées, en ce que lesdits alésages sont ménagés dans des bossages formés dans la paroi des boîtes à eau et en ce que lesdits alésages sont aptes à recevoir une vis auto-taraudeuse qui traverse une ouverture ménagée dans une joue des montants de manière à assurer la fixation de ladite joue sur la paroi latérale de la boîte à eau.To this end, it proposes a heat exchanger of the type defined in the introduction, comprising a bundle of tubes mounted between two water boxes, each of which is delimited by a wall of molded plastic material having two opposite lateral faces on which two are fixed. U-shaped uprights connecting the two water boxes and framing the beam, each of the uprights comprising a core on which two lateral cheeks depend, characterized in that each of the opposite lateral faces of the water boxes carry smooth-wall bores, the l the axis extends substantially perpendicular to the plane of said opposite lateral faces, in that said bores are formed in bosses formed in the wall of water boxes and in that said bores are capable of receiving a self-tapping screw which passes through a opening in a cheek of the uprights so as to ensure the fixing of said cheek on the wall side of the water box.

Dans ces conditions, la fixation des deux montants sur les deux boîtes à eau s'effectue d'une manière particulièrement simple puisque les alésages peuvent être venus de moulage avec les boîtes à eau et que la mise en place des vis auto-taraudeuses s'effectue par simple vissage au moyen d'un outil approprié.Under these conditions, the fixing of the two uprights on the two water boxes is carried out in a particularly simple manner since the bores may have come from molding with the water boxes and that the installation of the self-tapping screws is carried out by simple screwing by means of an appropriate tool.

L'invention s'applique tout particulièrement à un échangeur de chaleur de ce type dans lequel chaque montant comprend, de façon en soi connue, une extrémité munie d'ouvertures circulaires pour une fixation rigide sur l'une des deux boîtes à eau et une extrémité munie d'ouvertures oblongues pour une fixation coulissante sur l'autre boîte à eau, de manière à compenser les variations de dilatation.The invention applies very particularly to a heat exchanger of this type in which each upright comprises, in a manner known per se, an end provided with circular openings for rigid attachment to one of the two water boxes and a end provided with oblong openings for sliding attachment to the other water box, so as to compensate for variations in expansion.

Selon une autre caractéristique de l'invention, il est prévu que l'on utilise alors des vis auto-taraudeuses dont chacune est munie d'une bague cylindrique ayant un diamètre extérieur supérieur au diamètre intérieur de chacune des ouvertures circulaires, mais inférieur à la plus petite dimension de chacune des ouvertures oblongues.According to another characteristic of the invention, it is provided that self-tapping screws are then used, each of which is provided with a cylindrical ring having an outside diameter greater than the inside diameter of each of the circular openings, but less than the smallest dimension of each of the oblong openings.

Ainsi, dans le cas où une vis auto-taraudeuse est introduite dans une ouverture circulaire, la bague vient en appui contre la joue latérale du montant. Par contre, lorsqu'une telle vis auto-taraudeuse est introduite dans une ouverture oblongue d'un montant, la bague de la vis s'introduit dans l'ouverture oblongue et vient directement en appui contre la face latérale correspondante.Thus, in the case where a self-tapping screw is introduced into a circular opening, the ring bears against the lateral cheek of the upright. On the other hand, when such a self-tapping screw is introduced into an oblong opening of an upright, the ring of the screw is introduced into the oblong opening and comes to bear directly against the corresponding lateral face.

Ainsi, des vis taraudeuses de même type peuvent être utilisées aussi bien pour la fixation rigide d'un montant sur une boîte à eau que pour une fixation coulissante du montant sur l'autre boîte à eau.Thus, tapping screws of the same type can be used both for rigid attachment of an upright on a water box and for sliding attachment of the upright on the other water box.

La bague peut faire partie intégrante de la vis auto-taraudeuse ou bien être enfilée autour de cette dernière.The ring can be an integral part of the self-tapping screw or else be threaded around the latter.

Selon une autre caractéristique de l'invention, chacune des joues latérales d'un montant comprend une extrémité reliée par un décrochement, ce qui permet à cette extrémité de porter à plat contre la face correspondante de la boîte à eau.According to another characteristic of the invention, each of the lateral cheeks of an upright comprises an end connected by a recess, which allows this end to bear flat against the corresponding face of the water box.

On obtient ainsi une meilleure liaison entre le montant et la boîte à eau.A better connection is thus obtained between the upright and the water box.

L'invention envisage aussi que chacune des joues latérales comprend une extrémité dans son prolongement de manière que cette extrémité s'appuie sur une face décalée par rapport à la face de la boîte à eau.The invention also contemplates that each of the side cheeks has one end in its extension so that this end is supported on a face offset from the face of the water box.

Selon une autre caractéristique de l'invention, chacun des alésages borgnes est ménagé dans un bossage formé dans la paroi de la boîte à eau.According to another characteristic of the invention, each of the blind bores is formed in a boss formed in the wall of the water box.

Dans la description qui suit, donnée seulement à titre d'exemple, on se réfère aux dessins annexés, sur lesquels :

  • la figure 1 est une vue en élévation d'un échangeur de chaleur selon l'invention ;
  • la figure 2 est une vue latérale de l'échangeur de chaleur de la figure 1 ;
  • la figure 3 est une vue latérale schématique avec arrachement partiel d'un échangeur de chaleur selon l'invention ;
  • la figure 4 est une vue partielle d'une des faces latérales d'une des boîtes à eau ;
  • la figure 5 est une vue en élévation d'un des montants de l'échangeur de chaleur ;
  • la figure 6 est une vue de côté correspondante ;
  • la figure 7 représente une vis auto-taraudeuse avec bague intégrée ; et
  • la figure 8 représente une vis auto-taraudeuse avec bague rapportée.
In the description which follows, given only by way of example, reference is made to the appended drawings, in which:
  • Figure 1 is an elevational view of a heat exchanger according to the invention;
  • Figure 2 is a side view of the heat exchanger of Figure 1;
  • Figure 3 is a schematic side view with partial cutaway of a heat exchanger according to the invention;
  • Figure 4 is a partial view of one of the side faces of one of the water boxes;
  • Figure 5 is an elevational view of one of the uprights of the heat exchanger;
  • Figure 6 is a corresponding side view;
  • Figure 7 shows a self-tapping screw with integrated ring; and
  • Figure 8 shows a self-tapping screw with attached ring.

L'échangeur de chaleur représenté aux figures 1 et 2 comprend un faisceau 10 qui est formé d'une multiplicité de tubes 12 traversant des ailettes 14 et qui est monté entre deux boîtes à eau 16 et 18.The heat exchanger shown in FIGS. 1 and 2 comprises a bundle 10 which is formed from a multiplicity of tubes 12 passing through fins 14 and which is mounted between two water boxes 16 and 18.

La boîte à eau 16, placée en partie supérieure de l'échangeur de chaleur, comprend une plaque collectrice 20 encore appelée "plaque à trous", dans laquelle débouchent les extrémités des tubes 12 du faisceau. Sur le pourtour de la plaque collectrice 20 est fixée une paroi 22 en matière plastique moulée qui délimite la boîte à eau 16. Cette paroi comprend une tubulure d'entrée 24 et une tubulure de dégazage 26.The water box 16, placed in the upper part of the heat exchanger, comprises a collecting plate 20 also called a "hole plate", into which the ends of the tubes 12 of the bundle open. On the periphery of the collecting plate 20 is fixed a wall 22 of molded plastic which delimits the water box 16. This wall comprises an inlet pipe 24 and a degassing pipe 26.

La boîte à eau 18, placée en partie inférieure, comprend une plaque collectrice 28 dans laquelle débouchent les autres extrémités des tubes 12 ainsi qu'une paroi moulée en matière plastique, dans laquelle sont formées une tubulure de sortie 32 et une tubulure de vidange 34.The water box 18, placed in the lower part, comprises a collecting plate 28 into which the other ends of the tubes 12 open as well as a molded plastic wall, into which an outlet pipe 32 and a drain pipe 34 are formed. .

Les deux boîtes à eau 16 et 18 sont reliées entre elles par deux montants 36, à section transversale en forme de U, comprenant une âme 38 dont dépendent deux joues latérales 40. Chacune des deux joues 40 comprend une extrémité 42, de forme générale triangulaire, destinée à être fixée sur la boîte à eau 16 et une extrémité opposée 44, de forme générale triangulaire, destinée à être fixée sur la boîte à eau 18. Chacune des extrémités 42 ou 44 est fixée sur la boîte à eau correspondante par l'intermédiaire d'au moins une vis auto-taraudeuse 46. Ainsi, comme montré aux figures 1 et 2, chacun des montants est fixé à l'une des deux boîtes à eau par l'intermédiaire de quatre vis auto-taraudeuses 46, ce qui représente en tout 16 vis auto-taraudeuses pour l'échangeur de chaleur. Les deux montants 36 encadrent ainsi le faisceau 10.The two water boxes 16 and 18 are interconnected by two uprights 36, of U-shaped cross section, comprising a core 38 on which two lateral cheeks 40 depend. Each of the two cheeks 40 comprises one end 42, of generally triangular shape , intended to be fixed to the water box 16 and an opposite end 44, of generally triangular shape, intended to be fixed to the water box 18. Each of the ends 42 or 44 is fixed to the corresponding water box by the at least one self-tapping screw 46. Thus, as shown in FIGS. 1 and 2, each of the uprights is fixed to one of the two water boxes by means of four self-tapping screws 46, which represents a total of 16 self-tapping screws for the heat exchanger. The two uprights 36 thus frame the bundle 10.

Les montants 36 sont en outre reliés ensemble, sensiblement à mi-hauteur, par au moins un tirant 48, ici deux tirants, s'étendant transversalement à la direction des tubes 12 du faisceau.The uprights 36 are also connected together, substantially at mid-height, by at least one tie rod 48, here two tie rods, extending transversely to the direction of the tubes 12 of the bundle.

Comme montré à la figure 3, chacune des joues 40 d'un montant 36 comprend un décrochement 50 la reliant à son extrémité 42 et un autre décrochement 52 la reliant à son extrémité 44. Les deux extrémités 42 et 44 peuvent ainsi s'appliquer à plat contre respectivement les boîtes à eau 16 et 18 en contournant les protubérances formées par les plaques collectrices 20 et 28.As shown in FIG. 3, each of the cheeks 40 of an upright 36 comprises a step 50 connecting it to its end 42 and another step 52 connecting it to its end 44. The two ends 42 and 44 can thus be applied to flat against the water boxes 16 and 18 respectively, bypassing the protuberances formed by the collecting plates 20 and 28.

Comme montré à la figure 3, la paroi 22 de la boîte à eau 16 comprend deux faces opposées 54, sensiblement parallèles entre elles, sur lesquelles viennent se fixer respectivement les deux extrémités 42 d'un montant 36 et, de façon correspondante, la paroi 30 de la boîte à eau 18 comprend deux faces opposées 56 parallèles entre elles, sur lesquelles viennent se fixer respectivement les deux extrémités 44 du même montant.As shown in Figure 3, the wall 22 of the water box 16 comprises two opposite faces 54, substantially parallel to each other, on which are fixed respectively the two ends 42 of an upright 36 and, correspondingly, the wall 30 of the water box 18 comprises two opposite faces 56 parallel to each other, on which are fixed respectively the two ends 44 of the same amount.

Chacune des extrémités 42 (figures 3, 5 et 6) est munie de deux ouvertures 58 de forme générale oblongue, tandis que chacune des extrémités 44 est munie de deux ouvertures 60 de forme circulaire, pour permettre une fixation rigide de chaque montant 36 sur la boîte à eau 18 et une fixation coulissante de chaque montant 36 sur la boîte à eau 16.Each of the ends 42 (FIGS. 3, 5 and 6) is provided with two openings 58 of generally oblong shape, while each of the ends 44 is provided with two openings 60 of circular shape, to allow rigid fixing of each upright 36 on the water box 18 and a sliding attachment of each upright 36 on the water box 16.

Comme montré à la figure 5, chacune des ouvertures oblongues 58 possède une largeur l supérieure au diamètre d des ouvertures circulaires 60 et une longueur L supérieure à la largeur l et s'étendant dans le sens de la longueur du montant, pour permettre un débattement mutuel des deux boîtes à eau sous l'effet des différences de dilatation présentées par les tubes 12 du faisceau en fonction de la température du fluide qui les traverse.As shown in FIG. 5, each of the oblong openings 58 has a width l greater than the diameter d of circular openings 60 and a length L greater than the width l and extending in the direction of the length of the upright, to allow a clearance mutual of the two water boxes under the effect of the differences in expansion presented by the tubes 12 of the bundle as a function of the temperature of the fluid passing through them.

Dans chacune des faces opposées 54 de la boîte à eau 16 et dans chacune des faces opposées 56 de la boîte à eau 18 sont formés des alésages 62 à paroi lisse, qui dans l'exemple sont borgnes, et dont l'axe de chacun d'eux s'étend perpendiculairement au plan de la face plane 54 ou 56 correspondante. Les alésages 62 sont venus de moulage avec la boîte à eau correspondante et sont ménagés dans des bossages 64 formés dans la paroi 22 de la boîte à eau 16 ou dans la paroi 30 de la boîte à eau 18.In each of the opposite faces 54 of the water box 16 and in each of the opposite faces 56 of the water box 18 are formed bores 62 with smooth walls, which in the example are blind, and whose axis of each d 'them extends perpendicular to the plane of the corresponding flat face 54 or 56. The bores 62 have come from molding with the corresponding water box and are formed in bosses 64 formed in the wall 22 of the water box 16 or in the wall 30 of the water box 18.

La vis auto-taraudeuse 46 représentée à la figure 7 comprend successivement une tige filetée 66, une bague 68 en forme de collerette ayant un diamètre extérieur D et une hauteur h, une rondelle 70 de diamètre supérieur à D et enfin une tête hexagonale 72.The self-tapping screw 46 shown in FIG. 7 successively comprises a threaded rod 66, a ring 68 in the form of a flange having an outside diameter D and a height h, a washer 70 with a diameter greater than D and finally a hexagonal head 72.

Le diamètre D de la bague 68 est supérieur au diamètre d d'une ouverture 60 et inférieur à la largeur l d'une ouverture 58. Sa hauteur h est supérieure à l'épaisseur e de l'extrémité 42 ou 44 d'une joue 40.The diameter D of the ring 68 is greater than the diameter d of an opening 60 and less than the width l of an opening 58. Its height h is greater than the thickness e of the end 42 or 44 of a cheek 40.

Ainsi, comme on le voit sur la figure 3, la bague 68 d'une vis 46 vient appuyer contre l'extrémité 44 autour d'une ouverture 60 et assurer ainsi le serrage de cette extrémité 44 sur une face 56 de la boîte à eau 18.Thus, as can be seen in FIG. 3, the ring 68 of a screw 46 presses against the end 44 around an opening 60 and thus ensures the tightening of this end 44 on a face 56 of the water box 18.

Par contre, lorsque une vis taraudeuse 46 est engagée dans une ouverture oblongue 58 d'une extrémité 42, la bague 68 vient prendre appui directement contre la face 54 correspondante de la boîte à eau 16. Il en résulte que l'extrémité 42 est fixée à coulissement sur la boîte à eau 16.By cons, when a tapping screw 46 is engaged in an oblong opening 58 of one end 42, the ring 68 comes to bear directly against the corresponding face 54 of the water box 16. As a result, the end 42 is fixed sliding on the water box 16.

Dans la variante représentée à la figure 8, la bague 68, au lieu de faire partie intégrante de la vis auto-taraudeuse 46, est enfilée simplement sur cette dernière.In the variant shown in Figure 8, the ring 68, instead of being an integral part of the self-tapping screw 46, is simply threaded on the latter.

Etant donné que les alésages 62 peuvent être obtenus de moulage avec les deux boîtes à eau et que les vis auto-taraudeuses 46 s'introduisent par simple vissage en force dans les alésages 62, le montage et la fixation des montants 36 sont beaucoup plus simples à réaliser que dans le cas des échangeurs de chaleur de la technique antérieure.Since the bores 62 can be obtained by molding with the two water boxes and that the self-tapping screws 46 are introduced by simple screwing in force in the bores 62, the mounting and fixing of the uprights 36 are much simpler to realize that in the case of heat exchangers of the prior art.

De plus, il peut être envisagé, et cela sans sortir du cadre de l'invention, que chacune des joues 40 ne comprenne pas de décrochement 50. De ce fait, l'extrémité 42 se trouve dans le prolongement de la joue 40, tandis que les faces des alésages 62 en regard de l'extrémité se situent au-delà de la face de la paroi 54 ou 56 de la boîte à eau.In addition, it can be envisaged, and this without departing from the scope of the invention, that each of the cheeks 40 does not include an offset 50. As a result, the end 42 is located in the extension of the cheek 40, while that the faces of the bores 62 facing the end are located beyond the face of the wall 54 or 56 of the water box.

Grâce à cette disposition, les joues latrales 40 ne s'appuient plus sur les faces des boîtes à eau mais sur l'extrémité en saillie des bossages 62.Thanks to this arrangement, the lateral cheeks 40 are no longer supported on the faces of the water boxes but on the projecting end of the bosses 62.

Claims (6)

  1. A heat exchanger comprising a bundle (10) of tubes (12) mounted between two water headers (16, 18), each of which is delimited by a wall (22, 30) of moulded plastics material having two opposed side faces (54, 56), on which there are fixed two upright members (36) of U-shaped transverse cross section connecting the two headers and flanking the bundle, with each of the upright members (36) comprising a body portion (38) from which two lateral portions (50) depend, characterised in that each of the opposed side faces (54, 56) of the headers (16, 18) have smooth-walled bores (62), the axis of which extends substantially at right angles to the plane of the said opposed lateral faces, in that the said bores are formed in bosses (64) defined in the wall (22, 30) of the headers (16, 18), and in that the said bores are adapted to receive a self-tapping screw which extends through an aperture (58, 60) formed in a lateral portion (40) of the upright members (36), whereby to secure the said lateral portion on the side wall (54, 56) of the header (16, 18).
  2. A heat exchanger according to Claim 1, in which each upright member (36) includes an end portion (44) having circular apertures (60) for rigid fastening on one (18) of the two headers, and an end portion (42) formed with oblong apertures (58) for sliding fastening on the other one (16) of the two water headers, characterised in that use is made of a self-tapping screw (46) having a cylindrical ring (68) with an external diameter (D) greater than the diameter (d) of each circular aperture (60), but smaller than the smallest dimension (1) of each oblong aperture (58).
  3. A heat exchanger according to Claim 2, characterised in that the said ring (68) is an integral part of the self-tapping screw (46).
  4. A heat exchanger according to Claim 2, characterised in that the said ring (68) is fitted around the self-tapping screw (46).
  5. A heat exchanger according to one of Claims 1 to 4, characterised in that each of the lateral portions (40) of an upright member (36) has an end portion (42, 44), which is joined through a shoulder element (50, 52) which enables the said end portion to bear flat against the corresponding face (54, 56) of the water header (16, 18).
  6. A heat exchanger according to one of Claims 1 to 4, characterised in that each of the lateral portions (40) has an end portion (42, 44) that extends it in such a way that the end portion (42, 44) bears on a face which is offset with respect to the side face (54, 56) of the water header.
EP92400612A 1991-03-12 1992-03-10 Heat exchanger with connected water boxes for cars Revoked EP0504034B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9102981 1991-03-12
FR9102981A FR2674014B1 (en) 1991-03-12 1991-03-12 HEAT EXCHANGER WITH CONNECTED WATER BOXES FOR MOTOR VEHICLES.

Publications (2)

Publication Number Publication Date
EP0504034A1 EP0504034A1 (en) 1992-09-16
EP0504034B1 true EP0504034B1 (en) 1995-01-04

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Application Number Title Priority Date Filing Date
EP92400612A Revoked EP0504034B1 (en) 1991-03-12 1992-03-10 Heat exchanger with connected water boxes for cars

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US (1) US5228511A (en)
EP (1) EP0504034B1 (en)
DE (1) DE69201073T2 (en)
FR (1) FR2674014B1 (en)

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Also Published As

Publication number Publication date
FR2674014B1 (en) 1993-05-28
DE69201073D1 (en) 1995-02-16
US5228511A (en) 1993-07-20
DE69201073T2 (en) 1995-05-11
EP0504034A1 (en) 1992-09-16
FR2674014A1 (en) 1992-09-18

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