EP0756074A1 - Protective cover for a heat exchanger of a vehicle - Google Patents

Protective cover for a heat exchanger of a vehicle Download PDF

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Publication number
EP0756074A1
EP0756074A1 EP96111914A EP96111914A EP0756074A1 EP 0756074 A1 EP0756074 A1 EP 0756074A1 EP 96111914 A EP96111914 A EP 96111914A EP 96111914 A EP96111914 A EP 96111914A EP 0756074 A1 EP0756074 A1 EP 0756074A1
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EP
European Patent Office
Prior art keywords
protective screen
lateral edge
screen according
vehicle
heat 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Withdrawn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
EP96111914A
Other languages
German (de)
French (fr)
Inventor
Jean-Claude Naty
Gilles Caumel
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.)
Valeo Thermique Moteur SA
Original Assignee
Valeo Thermique Moteur SA
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 Valeo Thermique Moteur SA filed Critical Valeo Thermique Moteur SA
Publication of EP0756074A1 publication Critical patent/EP0756074A1/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/12—Filtering, cooling, or silencing cooling-air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/02—Safety or protection arrangements; Arrangements for preventing malfunction in the form of screens or covers

Definitions

  • the invention relates to a protective screen for a heat exchanger of a vehicle, in particular of a heavy goods vehicle or an industrial vehicle.
  • a protective screen which comprises a mesh ply capable of being placed facing the heat exchanger on the path of an air flow passing through the latter.
  • This screen forms a sort of grid to retain various dirt (mud, dust, sand, insects, etc.) which can be transported by the air flow and which tend to settle on the body of the exchanger, which then results in a decrease in heat exchange performance.
  • Such a protective screen is generally arranged opposite a first heat exchanger, such as a vehicle engine cooling radiator, to which is attached, where appropriate, a second heat exchanger, for example a cooler. charge air when the vehicle engine is equipped with a turbo-compressor.
  • a first heat exchanger such as a vehicle engine cooling radiator
  • a second heat exchanger for example a cooler
  • the object of the invention is in particular to overcome the aforementioned drawbacks.
  • the mesh ply comprises a first lateral edge capable of being fixed to the vehicle by first detachable fixing means, and a second lateral edge, opposite to the first lateral edge, and suitable for being fixed to the vehicle by second detachable fixing means, forming springs, to ensure the tensioning of the sheet.
  • the mesh ply can be easily put in place by detachable fixing means, some of which form springs, which at the same time ensures the tensioning of the ply.
  • disassembly is particularly easy, especially for maintenance and cleaning purposes.
  • the first fixing means comprise two retaining lugs capable of engaging in two retaining hooks linked to the vehicle.
  • the two retaining lugs are respectively formed at the two ends of a rigid border extending along the first lateral edge of the sheet.
  • the two retaining hooks have an opening directed opposite the second lateral edge of the sheet. It follows that, under the effect of the means forming springs, the retaining lugs tend to engage in the retaining hooks and to remain in place.
  • the retaining hooks are advantageously formed on a fluid box of the heat exchanger.
  • the retaining hooks may have come from molding with the fluid box, the latter being preferably made of plastic.
  • the invention applies in particular to a heat exchanger which comprises another fluid box, opposite to the first aforementioned fluid box.
  • the invention provides that retaining hooks can also be formed on this other fluid box to provide another method of fixing the sheet.
  • the second fixing means comprise at least two tension springs, each of which has an end suitable for being fixed to the second lateral edge of the sheet and another end suitable for being fixed to a fastener linked to the vehicle.
  • Each spring advantageously comprises a hook suitable for being engaged in a hole formed in a rigid border extending along the second lateral edge of the ply and another hook suitable for being engaged in a hole in the fastener.
  • the wire mesh of the invention can be formed from different materials to constitute a sort of grid or sieve, having a mesh or openings of chosen size, to retain the dirt liable to pass through the heat exchanger.
  • the web is a fabric of glass fiber fabric coated with PVC.
  • the first lateral edge and the second lateral edge are advantageously provided with a rigid border formed, for example, from a folded metal strip.
  • the web has a generally rectangular shape and further includes two other side edges.
  • the latter can optionally be provided with a flexible border, preferably made of plastic, bonded to the web.
  • FIG. 1 represents a heat exchanger 10 constituted, in the example, by a radiator used for cooling the engine of a motor vehicle, in particular of the heavy goods vehicle type.
  • the heat exchanger 10 comprises two fluid boxes: a fluid box 12 placed in the upper position and a fluid box 14 placed in the lower position.
  • the fluid boxes 12 and 14 are interconnected by a multiplicity of tubes 16 forming a beam and passing through a multiplicity of fins 18.
  • the ends of the tubes are connected to the manifold 12 via a manifold plate 20 and to the fluid box 14 by means of a collecting plate 22.
  • This heat exchanger is intended to be traversed by a heat transfer fluid, for example water added with an antifreeze, which enters the heat exchanger by an inlet pipe and leaves the latter by an outlet pipe.
  • a heat transfer fluid for example water added with an antifreeze
  • These two pipes can be formed on the same fluid box or on two different fluid boxes, as is well known in the art.
  • the heat exchanger 10 is provided with a protective screen comprising a meshed sheet 24 able to be placed facing the heat exchanger, and more particularly facing the bundle of finned tubes, on the path of a air flow intended to pass through the heat exchanger, that is to say to sweep the finned tubes of the bundle.
  • the ply 24 is placed in front of the heat exchanger 10 relative to the drawing in FIG. 1.
  • the mesh ply 24 is a flexible ply of generally rectangular shape which has a lateral edge 26 situated on the side of the fluid box 12, a lateral edge 28, opposite the lateral edge 26, and situated on the side of the fluid box 14.
  • the sheet also has two other opposite lateral edges 30 and 32.
  • the sheet is formed of a mesh or perforated material defining a mesh structure.
  • the tablecloth is formed from a fabric of a glass fiber fabric coated with PVC.
  • this fabric is formed from wires with a diameter of 0.20 mm, with a mesh void of 1.3 x 1.53 mm.
  • the lateral edge 26 is provided with a rigid edge 34 formed from a metal strip folded back on itself and glued to the ply 24.
  • a metal strip folded back on itself and glued to the ply 24.
  • the second lateral edge 28 is provided with a similar rigid border 36.
  • the constitution of this rigid border 36 is moreover visible on the upper part of FIG. 4.
  • the rigid border 34 extends over a length greater than that of the lateral edge 26 so as to form two retaining pins 38 and 40 projecting from the sheet. It is the same for the edge 36 which has two retaining pins 42 and 44 protruding on both sides of the sheet.
  • the pins 38 and 40 are intended to come to engage in two retaining hooks, respectively 46 and 48, coming from molding with the fluid box 12.
  • the hook 46 came from molding with a wall 50, with a U-shaped profile, of the fluid box 12.
  • the hook 46 is produced in the form of an open box suitable for receiving the pin 38.
  • This box is delimited by a bottom wall 52 attached perpendicularly to the wall 50 and extending parallel to the direction of the edge 34.
  • the housing is further delimited by a side wall 54 attached perpendicularly to the wall 50 of the fluid box and perpendicular to the bottom wall 52.
  • the housing is delimited by a front wall 56 which extends parallel to the wall 50 and which connects the walls 52 and 54. This housing thus defines an opening directed upwards, therefore at the opposite the opposite side edge 28 of the web.
  • the retaining hook 48 has a structure symmetrical to that of the hook 46.
  • the fluid box 14 includes two retaining hooks 58 and 60, similar to the hooks 46 and 48, and arranged in the region of the lugs 42 and 44.
  • the hooks 58 and 60 are not intended for cooperate with the lugs 42 and 44 in this exemplary embodiment, but are intended to provide another method of attachment, if necessary.
  • the second lateral edge 28 of the sheet is connected by two traction hooks 62 to two fasteners 64, for example made of aluminum, linked to a support 66 (shown in broken lines), forming part of the structure of the vehicle.
  • Each of the tension springs 62 is formed from a wire forming a helical body 68 with contiguous turns extending by two opposite hooks 70 and 72.
  • the hook 70 is suitable for engaging in a hole 74 formed in the thickness of the edge 36, while the hook 72 is suitable for engaging in a hole 76 (FIG. 1) of the fastener 64.
  • the lateral edges 30 and 32 are respectively provided with a flexible border 78, 80, advantageously made of plastic material glued to the sheet.
  • the invention is not limited to the embodiment described above by way of example and it is possible to provide other variants, in particular as regards the structure of the sheet and the detachable fixing means. .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The vehicle radiator protection screen comprises a wire mesh layer (24) located facing the radiator in the path of the air flow passing through the radiator. The wire mesh layer has a first lateral edge (26) which is fixed to the vehicle by removable fasteners. Its second lateral edge (28) is fixed to the vehicle by removable spring fasteners (62) which tension the grille. The fasteners comprise retaining lugs (38,40) which engage in two retaining hooks (46,48) connected to the vehicle. These two retaining lugs are formed at the two ends of a rigid edge (34) extending along the first lateral edge of the mesh. The two retaining hooks each have an opening directed opposite the grille second lateral edge and are moulded onto the radiator fluid casing (12).

Description

L'invention concerne un écran de protection pour un échangeur de chaleur d'un véhicule, en particulier d'un poids lourd ou d'un véhicule industriel.The invention relates to a protective screen for a heat exchanger of a vehicle, in particular of a heavy goods vehicle or an industrial vehicle.

Elle concerne plus particulièrement un tel écran de protection qui comprend une nappe grillagée propre à être disposée en regard de l'échangeur de chaleur sur le trajet d'un flux d'air traversant ce dernier.It relates more particularly to such a protective screen which comprises a mesh ply capable of being placed facing the heat exchanger on the path of an air flow passing through the latter.

Cet écran forme une sorte de grille pour retenir diverses salissures (boue, poussière, sable, insectes, etc.) qui peuvent être véhiculées par le flux d'air et qui ont tendance à se déposer sur le corps de l'échangeur, ce qui se traduit alors par une diminution des performances d'échange thermique.This screen forms a sort of grid to retain various dirt (mud, dust, sand, insects, etc.) which can be transported by the air flow and which tend to settle on the body of the exchanger, which then results in a decrease in heat exchange performance.

Un tel écran de protection est généralement disposé en regard d'un premier échangeur de chaleur, tel qu'un radiateur de refroidissement du moteur d'un véhicule, auquel est accolé, le cas échéant, un second échangeur de chaleur, par exemple un refroidisseur d'air de suralimentation lorsque le moteur du véhicule est muni d'un turbo-compresseur.Such a protective screen is generally arranged opposite a first heat exchanger, such as a vehicle engine cooling radiator, to which is attached, where appropriate, a second heat exchanger, for example a cooler. charge air when the vehicle engine is equipped with a turbo-compressor.

On a déjà proposé d'utiliser un écran fixe en forme de grille, qui est habituellement fixé en quatre coins sur l'échangeur de chaleur ou sur la structure du véhicule.It has already been proposed to use a fixed screen in the form of a grid, which is usually fixed at four corners on the heat exchanger or on the structure of the vehicle.

Toutefois, comme un tel écran doit être nettoyé périodiquement, cette solution connue n'est pas satisfaisante car le démontage de l'écran prend du temps, ce qui augmente le temps d'immobilisation du véhicule.However, as such a screen must be cleaned periodically, this known solution is not satisfactory because the disassembly of the screen takes time, which increases the immobilization time of the vehicle.

Il est connu par ailleurs, d'après la Demande de brevet français No 93 09247, d'utiliser un écran de protection sous la forme d'une nappe souple liée à un dispositif enrouleur, un dispositif de nettoyage étant prévu pour nettoyer automatiquement la nappe souple lorsqu'elle est enroulée ou déroulée.It is also known, according to French Patent Application No. 93 09247, to use a protective screen in the form of a flexible sheet linked to a winding device, a cleaning device being provided for cleaning automatically. the flexible sheet when it is wound or unwound.

Cette solution connue fonctionne de manière satisfaisante mais nécessite une structure complexe.This known solution works satisfactorily but requires a complex structure.

L'invention a notamment pour but de surmonter les inconvénients précités.The object of the invention is in particular to overcome the aforementioned drawbacks.

Elle propose en conséquence un écran de protection du type défini en introduction, dans lequel la nappe grillagée comprend un premier bord latéral propre à être fixé au véhicule par des premiers moyens de fixation détachables, et un second bord latéral, opposé au premier bord latéral, et propre à être fixé au véhicule par des seconds moyens de fixation détachables, formant ressorts, pour assurer la mise sous tension de la nappe.It therefore proposes a protective screen of the type defined in the introduction, in which the mesh ply comprises a first lateral edge capable of being fixed to the vehicle by first detachable fixing means, and a second lateral edge, opposite to the first lateral edge, and suitable for being fixed to the vehicle by second detachable fixing means, forming springs, to ensure the tensioning of the sheet.

Ainsi, la nappe grillagée peut être facilement mise en place par des moyens de fixation détachables, dont certains forment ressorts, ce qui permet en même temps d'assurer la mise sous tension de la nappe. De même, le démontage est particulièrement aisé, notamment à des fins d'entretien et de nettoyage.Thus, the mesh ply can be easily put in place by detachable fixing means, some of which form springs, which at the same time ensures the tensioning of the ply. Likewise, disassembly is particularly easy, especially for maintenance and cleaning purposes.

Dans une forme de réalisation préférée de l'invention, les premiers moyens de fixation comprennent deux ergots de retenue propres à s'engager dans deux crochets de retenue liés au véhicule.In a preferred embodiment of the invention, the first fixing means comprise two retaining lugs capable of engaging in two retaining hooks linked to the vehicle.

Avantageusement les deux ergots de retenue sont formés respectivement aux deux extrémités d'une bordure rigide s'étendant le long du premier bord latéral de la nappe.Advantageously, the two retaining lugs are respectively formed at the two ends of a rigid border extending along the first lateral edge of the sheet.

Selon une autre caractéristique de l'invention, les deux crochets de retenue présentent une ouverture dirigée à l'opposé du second bord latéral de la nappe. Il en résulte que, sous l'effet des moyens formant ressorts, les ergots de retenue tendent à s'engager dans les crochets de retenue et à rester en place.According to another characteristic of the invention, the two retaining hooks have an opening directed opposite the second lateral edge of the sheet. It follows that, under the effect of the means forming springs, the retaining lugs tend to engage in the retaining hooks and to remain in place.

Dans cette forme de réalisation préférée, les crochets de retenue sont formés avantageusement sur une boîte à fluide de l'échangeur de chaleur.In this preferred embodiment, the retaining hooks are advantageously formed on a fluid box of the heat exchanger.

A titre d'exemple, les crochets de retenue peuvent être venus de moulage avec la boîte à fluide, cette dernière étant réalisée, de préférence, en matière plastique.By way of example, the retaining hooks may have come from molding with the fluid box, the latter being preferably made of plastic.

L'invention s'applique en particulier à un échangeur de chaleur qui comprend une autre boîte à fluide, opposée à la première boîte à fluide précitée. Dans ce cas, l'invention prévoit que des crochets de retenue peuvent être également formés sur cette autre boîte à fluide pour procurer un autre mode de fixation de la nappe.The invention applies in particular to a heat exchanger which comprises another fluid box, opposite to the first aforementioned fluid box. In this case, the invention provides that retaining hooks can also be formed on this other fluid box to provide another method of fixing the sheet.

Dans une forme de réalisation préférée de l'invention, les seconds moyens de fixation comprennent au moins deux ressorts de traction dont chacun présente une extrémité propre à être fixée au second bord latéral de la nappe et une autre extrémité propre à être fixée à une attache liée au véhicule.In a preferred embodiment of the invention, the second fixing means comprise at least two tension springs, each of which has an end suitable for being fixed to the second lateral edge of the sheet and another end suitable for being fixed to a fastener linked to the vehicle.

Chaque ressort comprend avantageusement un crochet propre à être engagé dans un trou formé dans une bordure rigide s'étendant le long du second bord latéral de la nappe et un autre crochet propre à être engagé dans un trou de l'attache.Each spring advantageously comprises a hook suitable for being engaged in a hole formed in a rigid border extending along the second lateral edge of the ply and another hook suitable for being engaged in a hole in the fastener.

La nappe grillagée de l'invention peut être formée à partir de différents matériaux pour constituer une sorte de grille ou de tamis, présentant un maillage ou des ouvertures de dimension choisie, pour retenir les salissures susceptibles de traverser l'échangeur de chaleur.The wire mesh of the invention can be formed from different materials to constitute a sort of grid or sieve, having a mesh or openings of chosen size, to retain the dirt liable to pass through the heat exchanger.

Dans une forme de réalisation préférée de l'invention, la nappe est une toile en tissu de fibres de verre enduit de PVC.In a preferred embodiment of the invention, the web is a fabric of glass fiber fabric coated with PVC.

Le premier bord latéral et le second bord latéral sont avantageusement munis d'une bordure rigide formées par exemple, à partir d'une bande métallique repliée.The first lateral edge and the second lateral edge are advantageously provided with a rigid border formed, for example, from a folded metal strip.

Habituellement, la nappe a une forme générale rectangulaire et comprend en outre deux autres bords latéraux. Ces derniers peuvent être éventuellement munis d'une bordure souple, de préférence en matière plastique, collée sur la nappe.Usually, the web has a generally rectangular shape and further includes two other side edges. The latter can optionally be provided with a flexible border, preferably made of plastic, bonded to the web.

Dans la description qui suit, faite seulement à titre d'exemple, on se réfère au dessin annexé, sur lequel :

  • la figure 1 est une vue en élévation, avec arrachement, d'un échangeur de chaleur muni d'un écran de protection selon l'invention;
  • la figure 2 est une vue, en coupe transversale, et à échelle agrandie, selon la ligne II-II de la figure 1;
  • la figure 3 est une vue partielle de dessus correspondant à la figure 2;
  • la figure 4 est une vue en élévation d'un ressort de fixation; et
  • la figure 5 est une vue de côté d'un des deux crochets du ressort de la figure 4.
In the description which follows, given solely by way of example, reference is made to the appended drawing, in which:
  • Figure 1 is an elevational view, broken away, of a heat exchanger provided with a protective screen according to the invention;
  • Figure 2 is a view, in cross section, and on an enlarged scale, along the line II-II of Figure 1;
  • Figure 3 is a partial top view corresponding to Figure 2;
  • Figure 4 is an elevational view of a fixing spring; and
  • FIG. 5 is a side view of one of the two hooks of the spring of FIG. 4.

On se réfère tout d'abord à la figure 1 qui représente un échangeur de chaleur 10 constitué, dans l'exemple, par un radiateur servant au refroidissement du moteur d'un véhicule automobile, en particulier du type poids lourd. L'échangeur de chaleur 10 comprend deux boîtes à fluide : une boîte à fluide 12 placée en position supérieure et une boîte à fluide 14 placée en position inférieure. Les boîtes à fluide 12 et 14 sont reliées entre elles par une multiplicité de tubes 16 formant faisceau et traversant une multiplicité d'ailettes 18. Les extrémités des tubes sont reliées à la boîte collectrice 12 par l'intermédiaire d'une plaque collectrice 20 et à la boîte à fluide 14 par l'intermédiaire d'une plaque collectrice 22.First of all, reference is made to FIG. 1 which represents a heat exchanger 10 constituted, in the example, by a radiator used for cooling the engine of a motor vehicle, in particular of the heavy goods vehicle type. The heat exchanger 10 comprises two fluid boxes: a fluid box 12 placed in the upper position and a fluid box 14 placed in the lower position. The fluid boxes 12 and 14 are interconnected by a multiplicity of tubes 16 forming a beam and passing through a multiplicity of fins 18. The ends of the tubes are connected to the manifold 12 via a manifold plate 20 and to the fluid box 14 by means of a collecting plate 22.

Cet échangeur de chaleur est destiné à être parcouru par un fluide caloporteur, par exemple de l'eau additionnée d'un antigel, qui pénètre dans l'échangeur de chaleur par une tubulure d'entrée et quitte celui-ci par une tubulure de sortie. Ces deux tubulures (non représentées) peuvent être formées sur une même boîte à fluide ou sur deux boîtes à fluide différentes, comme cela est bien connu dans la technique.This heat exchanger is intended to be traversed by a heat transfer fluid, for example water added with an antifreeze, which enters the heat exchanger by an inlet pipe and leaves the latter by an outlet pipe. . These two pipes (not shown) can be formed on the same fluid box or on two different fluid boxes, as is well known in the art.

L'échangeur de chaleur 10 est muni d'un écran de protection comprenant une nappe grillagée 24 propre à être disposée en regard de l'échangeur de chaleur, et plus particulièrement en regard du faisceau de tubes à ailettes, sur le trajet d'un flux d'air destiné à traverser l'échangeur de chaleur, c'est-à-dire à balayer les tubes à ailettes du faisceau.The heat exchanger 10 is provided with a protective screen comprising a meshed sheet 24 able to be placed facing the heat exchanger, and more particularly facing the bundle of finned tubes, on the path of a air flow intended to pass through the heat exchanger, that is to say to sweep the finned tubes of the bundle.

Dans l'exemple représenté, la nappe 24 est placée en avant de l'échangeur de chaleur 10 par rapport au dessin de la figure 1.In the example shown, the ply 24 is placed in front of the heat exchanger 10 relative to the drawing in FIG. 1.

La nappe grillagée 24 est une nappe souple de forme générale rectangulaire qui présente un bord latéral 26 situé du côté de la boîte à fluide 12, un bord latéral 28, opposé au bord latéral 26, et situé du côté de la boîte à fluide 14. La nappe présente en outre deux autres bords latéraux opposés 30 et 32.The mesh ply 24 is a flexible ply of generally rectangular shape which has a lateral edge 26 situated on the side of the fluid box 12, a lateral edge 28, opposite the lateral edge 26, and situated on the side of the fluid box 14. The sheet also has two other opposite lateral edges 30 and 32.

La nappe est formée d'un matériau grillagé ou perforé définissant une structure maillée. Dans l'exemple, la nappe est formée d'une toile d'un tissu en fibres de verre enduit de PVC. Dans l'exemple, ce tissu est formé à partir de fils d'un diamètre de 0,20 mm, avec un vide de mailles de 1,3 x 1,53 mm.The sheet is formed of a mesh or perforated material defining a mesh structure. In the example, the tablecloth is formed from a fabric of a glass fiber fabric coated with PVC. In the example, this fabric is formed from wires with a diameter of 0.20 mm, with a mesh void of 1.3 x 1.53 mm.

Le bord latéral 26 est muni d'une bordure rigide 34 formée à partir d'une bande métallique repliée sur elle-même et collée à la nappe 24. A titre d'exemple, on peut utiliser une bande en aluminium d'une épaisseur de 0,8 mm, repliée en quatre épaisseurs.The lateral edge 26 is provided with a rigid edge 34 formed from a metal strip folded back on itself and glued to the ply 24. By way of example, an aluminum strip with a thickness of 0.8 mm, folded in four thicknesses.

De même, le second bord latéral 28 est muni d'une bordure rigide 36 analogue. La constitution de cette bordure rigide 36 est d'ailleurs visible sur la partie supérieure de la figure 4.Likewise, the second lateral edge 28 is provided with a similar rigid border 36. The constitution of this rigid border 36 is moreover visible on the upper part of FIG. 4.

La bordure rigide 34 s'étend sur une longueur supérieure à celle du bord latéral 26 de manière à former deux ergots de retenue 38 et 40 dépassant de la nappe. Il en est de même de la bordure 36 qui présente deux ergots de retenue 42 et 44 dépassant des deux côtés de la nappe.The rigid border 34 extends over a length greater than that of the lateral edge 26 so as to form two retaining pins 38 and 40 projecting from the sheet. It is the same for the edge 36 which has two retaining pins 42 and 44 protruding on both sides of the sheet.

Les ergots 38 et 40 sont destinés à venir s'engager dans deux crochets de retenue, respectivement 46 et 48, venus de moulage avec la boîte à fluide 12.The pins 38 and 40 are intended to come to engage in two retaining hooks, respectively 46 and 48, coming from molding with the fluid box 12.

On décrira maintenant la structure du crochet de retenue 46 en référence aux figures 2 et 3.The structure of the retaining hook 46 will now be described with reference to FIGS. 2 and 3.

Le crochet 46 est venu de moulage avec une paroi 50, à profil en U, de la boîte à fluide 12. Le crochet 46 est réalisé sous la forme d'un boîtier ouvert propre à recevoir l'ergot 38. Ce boîtier est délimité par une paroi de fond 52 rattachée perpendiculairement à la paroi 50 et s'étendant parallèlement à la direction de la bordure 34. Le boîtier est en outre délimité par une paroi latérale 54 rattachée perpendiculairement à la paroi 50 de la boîte à fluide et perpendiculairement à la paroi de fond 52. En outre, le boîtier est délimité par une paroi antérieure 56 qui s'étend parallèlement à la paroi 50 et qui relie les parois 52 et 54. Ce boitier définit ainsi une ouverture dirigée vers le haut, donc à l'opposé du bord latéral opposé 28 de la nappe.The hook 46 came from molding with a wall 50, with a U-shaped profile, of the fluid box 12. The hook 46 is produced in the form of an open box suitable for receiving the pin 38. This box is delimited by a bottom wall 52 attached perpendicularly to the wall 50 and extending parallel to the direction of the edge 34. The housing is further delimited by a side wall 54 attached perpendicularly to the wall 50 of the fluid box and perpendicular to the bottom wall 52. In addition, the housing is delimited by a front wall 56 which extends parallel to the wall 50 and which connects the walls 52 and 54. This housing thus defines an opening directed upwards, therefore at the opposite the opposite side edge 28 of the web.

Le crochet de retenue 48 comporte une structure symétrique de celle du crochet 46.The retaining hook 48 has a structure symmetrical to that of the hook 46.

Comme on le voit également sur la figure 1, la boîte à fluide 14 comporte deux crochets de retenue 58 et 60, analogues aux crochets 46 et 48, et disposés dans la région des ergots 42 et 44. En fait, les crochets 58 et 60 ne sont pas destinés à coopérer avec les ergots 42 et 44 dans cet exemple de réalisation, mais sont destinés à procurer un autre mode de fixation, le cas échéant.As can also be seen in FIG. 1, the fluid box 14 includes two retaining hooks 58 and 60, similar to the hooks 46 and 48, and arranged in the region of the lugs 42 and 44. In fact, the hooks 58 and 60 are not intended for cooperate with the lugs 42 and 44 in this exemplary embodiment, but are intended to provide another method of attachment, if necessary.

Le second bord latéral 28 de la nappe est relié par deux crochets de traction 62 à deux attaches 64, par exemple en aluminium, liées à un support 66 (représenté en trait interrompu), faisant partie de la structure du véhicule.The second lateral edge 28 of the sheet is connected by two traction hooks 62 to two fasteners 64, for example made of aluminum, linked to a support 66 (shown in broken lines), forming part of the structure of the vehicle.

Chacun des ressorts de traction 62 est formé à partir d'un fil formant un corps hélicoïdal 68 à spires jointives se prolongeant par deux crochets opposés 70 et 72.Each of the tension springs 62 is formed from a wire forming a helical body 68 with contiguous turns extending by two opposite hooks 70 and 72.

Le crochet 70 est propre à s'engager dans un trou 74 ménagé dans l'épaisseur de la bordure 36, tandis que le crochet 72 est propre à s'engager dans un trou 76 (figure 1) de l'attache 64.The hook 70 is suitable for engaging in a hole 74 formed in the thickness of the edge 36, while the hook 72 is suitable for engaging in a hole 76 (FIG. 1) of the fastener 64.

Comme on peut le voir également sur la figure 1, les bords latéraux 30 et 32 sont munis respectivement d'une bordure souple 78, 80, avantageusement en matière plastique collée sur la nappe.As can also be seen in FIG. 1, the lateral edges 30 and 32 are respectively provided with a flexible border 78, 80, advantageously made of plastic material glued to the sheet.

Pour mettre en place l'écran de protection, il suffit d'engager les ergots 38 et 40 dans les crochets de retenue 46 et 48 puis d'exercer une traction sur les ressorts 62 de manière à écarter leurs spires respectives et à permettre l'engagement des crochets 72 dans les trous 76 des pattes 64. La nappe se trouve ainsi maintenue sous tension dans la position représentée à la figure 1.To set up the protective screen, it suffices to engage the pins 38 and 40 in the retaining hooks 46 and 48 and then to exert a traction on the springs 62 so as to spread their respective turns and to allow the engagement of the hooks 72 in the holes 76 of the legs 64. The ply is thus kept under tension in the position shown in FIG. 1.

Dans cette position, les ergots 42 et 44 ne sont pas engagés dans les crochets de retenue 58 et 60. Ces derniers pourraient servir dans un autre mode de fixation. Il conviendrait alors que les pattes de fixation 76 se trouvent du côté de la boîte à fluide 12.In this position, the pins 42 and 44 are not engaged in the retaining hooks 58 and 60. The latter could be used in another method of attachment. The fixing lugs 76 should then be on the side of the fluid box 12.

Pour le démontage, il suffit d'exercer une traction sur les ressorts 62 pour décrocher les crochets 72 des attaches 64, afin de désengager les ergots 38 et 40 de leurs crochets de retenue respectifs 46 et 48. La nappe peut ainsi être facilement nettoyée puis remise en place en suivant la procédure indiquée précédemment.For disassembly, it suffices to exert traction on the springs 62 to unhook the hooks 72 from the fasteners 64, in order to disengage the pins 38 and 40 from their respective retaining hooks 46 and 48. The sheet can thus be easily cleaned and then replaced by following the procedure indicated above.

Bien entendu, l'invention n'est pas limitée à la forme de réalisation décrite précédemment à titre d'exemple et il est possible de prévoir d'autres variantes, notamment en ce qui concerne la structure de la nappe et les moyens de fixation détachables.Of course, the invention is not limited to the embodiment described above by way of example and it is possible to provide other variants, in particular as regards the structure of the sheet and the detachable fixing means. .

Claims (12)

Ecran de protection pour un échangeur de chaleur de véhicule, du type comprenant une nappe grillagée propre à être disposée en regard de l'échangeur de chaleur sur le trajet d'un flux d'air traversant ce dernier,
caractérisé en ce que la nappe grillagée (24) comprend un premier bord latéral (26) propre à être fixé au véhicule par des premiers moyens de fixation détachables (38, 40, 46, 48), et un second bord latéral (28), opposé au premier bord latéral (26), et propre à être fixé au véhicule par des seconds moyens de fixation détachables (62), formant ressorts, pour assurer la mise sous tension de la nappe grillagée (24).Protective screen for a vehicle heat exchanger, of the type comprising a wire mesh suitable for being placed facing the heat exchanger on the path of an air flow passing through it,
characterized in that the mesh ply (24) comprises a first lateral edge (26) suitable for being fixed to the vehicle by first detachable fixing means (38, 40, 46, 48), and a second lateral edge (28), opposite the first lateral edge (26), and suitable for being fixed to the vehicle by second detachable fixing means (62), forming springs, to ensure the tensioning of the mesh ply (24). Ecran de protection selon la revendication 1, caractérisé en ce que les premiers moyens de fixation comprennent deux ergots de retenue (38, 40) propres à s'engager dans deux crochets de retenue (46, 48) liés au véhicule.Protective screen according to claim 1, characterized in that the first fixing means comprise two retaining lugs (38, 40) suitable for engaging in two retaining hooks (46, 48) linked to the vehicle. Ecran de protection selon la revendication 2, caractérisé en ce que les deux ergots de retenue (38, 40) sont formés respectivement aux deux extrémités d'une bordure rigide (34) s'étendant le long du premier bord latéral (26) de la nappe.Protective screen according to claim 2, characterized in that the two retaining pins (38, 40) are formed respectively at the two ends of a rigid border (34) extending along the first lateral edge (26) of the tablecloth. Ecran de protection selon l'une des revendications 1 à 3, caractérisé en ce que les deux crochets de retenue (46, 48) présentent chacun une ouverture dirigée à l'opposé du second bord latéral (28) de la nappe grillagée (24).Protective screen according to one of claims 1 to 3, characterized in that the two retaining hooks (46, 48) each have an opening directed away from the second lateral edge (28) of the mesh ply (24) . Ecran de protection selon l'une des revendications 2 à 4, caractérisé en ce que les crochets de retenue (46, 48) sont formés sur une boîte à fluide (12) de l'échangeur de chaleur.Protective screen according to one of claims 2 to 4, characterized in that the retaining hooks (46, 48) are formed on a fluid box (12) of the heat exchanger. Ecran de protection selon la revendication 5, caractérisé en ce que les crochets de retenue (46, 48) sont venus de moulage avec la boîte à fluide (12), celle-ci étant réalisée, de préférence, en matière plastique.Protective screen according to claim 5, characterized in that the retaining hooks (46, 48) are molded with the fluid box (12), the latter being preferably made of plastic. Ecran de protection selon l'une des revendications 5 et 6, dans lequel l'échangeur de chaleur (10) comprend une autre boîte à fluide (14), caractérisé en ce que des crochets de retenue (58, 60) sont également prévus sur cette autre boîte à fluide (14) pour procurer un autre mode de fixation de la nappe.Protective screen according to either of Claims 5 and 6, in which the heat exchanger (10) comprises another fluid box (14), characterized in that retaining hooks (58, 60) are also provided on this other fluid box (14) to provide another method of fixing the sheet. Ecran de protection selon l'une des revendications 1 à 7, caractérisé en ce que les seconds moyens de fixation comprennent au moins deux ressorts de traction (62) dont chacun présente une extrémité (70) propre à être fixée au second bord latéral (28) de la nappe et une autre extrémité (72) propre à être fixée à une attache (64) liée au véhicule.Protective screen according to one of claims 1 to 7, characterized in that the second fixing means comprise at least two tension springs (62) each of which has one end (70) suitable for being fixed to the second lateral edge (28 ) of the ply and another end (72) suitable for being fixed to a fastener (64) linked to the vehicle. Ecran de protection selon la revendication 8, caractérisé en ce que chaque ressort de traction (62) comprend un crochet (70) propre à être engagé dans un trou (74) formé dans une bordure rigide (36) s'étendant le long du bord latéral (28) de la nappe grillagée (24) et un autre crochet (72) propre à être engagé dans un trou (76) de l'attache (64).Protective screen according to claim 8, characterized in that each tension spring (62) comprises a hook (70) suitable for being engaged in a hole (74) formed in a rigid border (36) extending along the edge side (28) of the wire mesh (24) and another hook (72) suitable for being engaged in a hole (76) of the fastener (64). Ecran de protection selon l'une des revendications 1 à 9, caractérisé en ce que la nappe (24) est une toile en tissu de fibres de verre enduit de PVC.Protective screen according to one of claims 1 to 9, characterized in that the ply (24) is a fabric of glass fiber fabric coated with PVC. Ecran de protection selon l'une des revendications 1 à 10, caractérisé en ce que le premier bord latéral (26) et le second bord latéral (28) sont munis d'une bordure rigide (34, 36) formée à partir d'une bande métallique repliée.Protective screen according to one of claims 1 to 10, characterized in that the first lateral edge (26) and the second lateral edge (28) are provided with a rigid edge (34, 36) formed from a folded metal strip. Ecran de protection selon l'une des revendications 1 à 11, caractérisé en ce que la nappe grillagée (24) comprend en outre deux autres bords latéraux (30, 32) munis d'une bordure souple (78, 80), de préférence en matière plastique, collée sur la nappe grillagée.Protective screen according to one of claims 1 to 11, characterized in that the mesh ply (24) further comprises two other lateral edges (30, 32) provided with a flexible border (78, 80), preferably in plastic material, glued to the wire mesh.
EP96111914A 1995-07-27 1996-07-24 Protective cover for a heat exchanger of a vehicle Withdrawn EP0756074A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9509176 1995-07-27
FR9509176A FR2737157B1 (en) 1995-07-27 1995-07-27 PROTECTION SCREEN FOR VEHICLE HEAT EXCHANGER

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EP0756074A1 true EP0756074A1 (en) 1997-01-29

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EP (1) EP0756074A1 (en)
FR (1) FR2737157B1 (en)

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US5718283A (en) 1998-02-17
FR2737157A1 (en) 1997-01-31
FR2737157B1 (en) 1997-08-29

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