EP0127496A1 - Apparatus for the production of infra-red or ultra-violet radiation - Google Patents

Abstract

This device comprises a panel grouping several transmitting rods (5) behind which are reflective means, the rods (5) are arranged at equal distance and parallel to each other, inside a rectangular frame, while, behind the rods (5) is a reflector, the overall shape of which consists of a succession of concave gutters (19), each placed behind a transmitter rod (5), each gutter (19) being defined by the juxtaposition of two longitudinal elements (8), each of which has a V-shaped cross section, the two branches of which are concave towards the outside, the junction gap (20) of two juxtaposed elements (8) being masked by a reflecting longitudinal shield ( 9) placed at this location behind the two elements (8), each of which is self-supporting.

Description

The present invention relates to a device intended for the production and diffusion by reflection of infrared or ultraviolet radiation.

Devices of this type are known, being in the form of panels capable of being used, for example, in the stationery, textile, plastics, etc. industries. Infrared panels are also used in tunnel ovens, for example for baking bread in an industrial bakery, or for drying paint in the automotive industry.

• - le réflecteur et ses organes de support sont soumis à des contraintes thermiques importantes, du fait de la température élevée des cannes de quartz immédiatement voisines ;
• - ces contraintes varient avec la puissance de rayonnement des cannes de quartz ;
• - il est difficile de réaliser un réflecteur supportant ces contraintes importantes et variables, tout en occupant la totalité de l'importante surface du panneau.

In most cases, the production of infrared radiation is ensured by rectilinear quartz rods, distributed parallel to each other, over the entire surface of the panel, the rear face of which is occupied by a reflector system capable of returning towards the before all of the radiation emitted. The structure of the panel, and more particularly the production of the reflector, poses a problem which is difficult to solve, due to the following imperatives:

• - The reflector and its support members are subjected to significant thermal stresses, due to the high temperature of the immediately adjacent quartz rods;
• - these constraints vary with the radiation power of the quartz rods;
• - It is difficult to produce a reflector supporting these large and variable constraints, while occupying the entire large surface of the panel.

In patent FR 70 21350, a lighting device with a light distribution grid has been proposed comprising reflective longitudinal blades, terminating at their upper part on the side of the lamps, in reflective intermediate blades having approximately the V shape.

This device relates to the actual lighting and does not concern infrared radiation. On the other hand, the opening angle corresponding to the lost radiation is 110 degrees, which represents 30% of the total radiation. In addition, no ventilation is provided. Such a structure could not be implemented at a temperature of 2700 ° K like that which must prevail in the devices according to the invention.

In US Patent 3,654,471, a ray reflector device has been described comprising an elongated reflector body having a curved support surface for a reflective strip which is pressed against this support surface. In this structure, an air gap passes between two reflectors and causes a Venturi phenomenon causing corrosive vapors which "lick" the emitter and the reflective part of the reflector.

In practice, it is found that most of the known installations solve the problem in an incomplete manner. For example, it is known to produce a panel capable of diffusing only infrared radiation of constant wavelength. This has a disadvantage in practice, because we know that it would be interesting to be able to vary the wavelength during operation, especially since a short infrared quartz cane is much more expensive than a cane. long infrared.

The present invention aims to avoid these drawbacks, by providing a device for the production and reflection of infrared radiation, under the form of a panel grouping several transmitting rods behind which are reflective means, characterized in that the rods are arranged at equal distance and parallel to each other, inside a rectangular frame while, behind the rods , is a reflector, the overall shape of which consists of a succession of concave gutters, each placed behind a transmitting rod, each gutter being defined by the juxtaposition of two longitudinal elements, each of which has a V-shaped cross section, the two of which branches are concave on the outside, the junction gap of two juxtaposed elements being masked by a longitudinal shield placed at this location behind the two elements, each of which is self-supporting.

According to another characteristic of the invention, each of the longitudinal elements with a concave V-shaped section consists of a metal sheet folded according to this V-shaped profile, so that it is not only self-supporting, but also capable of deforming elastically under the effect of variable thermal stresses, of the kind that one encounters for example if one varies, during operation, the power of radiation, and therefore the wavelength of the rays emitted.

In order to further improve the performance of the device, in particular when the infrared radiation is of high intensity, it is useful to provide a reflector for infrared emitting tubes comprising a juxtaposition of rear shields and elements in two half-gutters, and characterized in that at least the elements in two half-gutters are hollow, their interior space being traversed by a cooling fluid.

According to another characteristic of the invention, the rear shields are also hollow and double wall, their interior space being traversed by a cooling fluid.

The cooling fluid which circulates in the double walls of the reflector can be, for example, blown air.

Various technological solutions can be proposed, to realize the double wall of shields and V-shaped elements with two half gutters.

We have also designed an improvement of the device intended to facilitate the installation of the protective shield at each junction between each of the two half gutters.

The device according to the invention, intended to mask the radiation emitted by a tube in the direction of a gap defined in the reflector located behind this tube, is characterized in that the shield consists of an opaque strip applied along a part of the rear surface of the radiating tube.

According to another characteristic of the invention, the metal strip forming the shield is formed by a metallization deposit carried out directly on the wall of the tube, which then takes the form of an ordinary tube, opacified only along '' a reflective strip, made of metal or ceramic.

According to another characteristic of the invention, the shield is constituted by a concave metal strip, made of sheet metal, attached against a pirtie of the rear longitudinal wall of the tube. In other words, the width of this metal band in the shape of a gutter is significantly less than the diameter of the tube. It is understood that the word "sheet" is taken in its broadest sense, that is to say without limitation on the nature of the metal used.

According to another characteristic of the invention, the concave metal gutter constituting the shield is fixed on the tube by elastic clipping, so that when you change a tube, you can use the shield of the old on the new tube.

Finally, in a particular embodiment of the invention, each V-shaped element of the reflector has at least its reflecting surface formed by a layer or a sheet of gold or other metals.

It should be specified that, for simplification purposes, the invention described here will only refer to devices for producing infrared radiation, but it should be understood that these devices can be used for any radiation and more particularly for ultraviolet radiation.

The appended drawings, given by way of nonlimiting example, will allow a better understanding of the characteristics of the invention.

• - Figure 1 is a front view of a transmitter and reflective panel according to the invention.
• - Figure 2 is a partial section along II-II (Figure 1).
• - Figure 3 is a perspective view of one of the V-shaped elements, the juxtaposition of which forms the reflector.
• - Figure 4 is a perspective view of one of the shields that is placed behind the connection gap of the V-shaped elements of the reflector.
• - Figure 5 is a cross section along V-V (Figure 1), showing the organization of the whole of the reflector and_the emitting rods.
• - Figure 6 shows two parts before their assembly, to form a double-walled element with a curvilinear V-section.
• - Figure 7 shows the element thus finished.
• - Figures 8 and 9 are two similar views, for the constitution of a double wall rear bumper.
• - Figures 10 and 11 correspond to another alternative embodiment, for the V-shaped element and the rear shield.
• - Figure 12 is a cross section of the reflector, obtained using the variant of Figures 6 to 9.
• - Figure 13 is a similar section of the receiver obtained by assembling the parts of the variant of Figures 10 and 11.
• - Figure 14 is a sectional view illustrating a known embodiment for the establishment of the shield.
• - Figure 15 is a corresponding view illustrating the device according to the invention.
• - Figure 16 shows a radiation tube according to the invention.
• - Figures 17 to 19 illustrate two removable variants of a shield according to the invention.

There is shown in the drawings a panel 1 used both to produce infrared radiation, and to diffuse it by reflection over its entire surface.

The panel is constituted by a frame formed by two crosspieces 2, and two longitudinal members 3 and 4. On the rectangular frame thus produced, are placed side by side and parallel to each other, emitting rods 5 made of quartz. Each of the rods 5 is disposed inside the frame, parallel to the crosspieces 2, one end of each rod 5 being carried by the beam 4, while the other is carried by the beam 3. The latter also has electrical connection means constituted in particular by studs 6, to supply the quartz rods 5.

The rods 5 are distributed on the front face of the panel 1, the rear face of which is occupied by a reflector 7. The whole of the latter is formed by the juxtaposition of V-shaped elements 8, and rear shields 9 (Figure 5 ).

Each V-shaped element 8 is constituted by a sheet folded along a cross section having the shape of a V, the lateral faces 10 and 11 of which are concave towards the outside. Each lateral face 10 or 11 of the V is surmounted by a rim 12 or 13, itself surmounted by a tab 14 or 15, slightly folded inwards. A structure is thus obtained, the details of which appear in FIG. 3, and which has the advantage of being self-supporting, while allowing the free development of the stresses and deformations of expansion, even if the latter are variable over time, like this. is the case if one wants to vary during the walk the power and the wavelength of the infrared radiation emitted.

To facilitate mounting, a longitudinal notch 16 is preferably provided, for each end of the vertical flanges 12 and 13, in the wings 21 and 23.

Each shield 9 is constituted by a simple strip of sheet metal, curved according to a transverse profile in an arc of a circle, which allows it, too, to be self-supporting. The width 17 of each shield 9 is greater than or equal to the distance 18 separating the divergent ends of the two legs 14 and 15, juxtaposed after assembly (Figure 5).

In a preferred embodiment of the invention (not shown), the support of the V-shaped elements 8 is constituted by simple pins which support the ends of the legs 14,15. For shields, three pins are provided at each end, one at center of the concave part, and two at the ends of the convex part.

The juxtaposition of the V-shaped elements 8 and the shields 9 to constitute the rear reflector of the panel 1 according to the invention is carried out as indicated in FIG. 5. In other words, the V-shaped elements 8 are arranged side by side, longitudinally, each vertical rim 12 of one being immediately adjacent to the vertical rim 13 of the adjacent element. There is thus defined around each quartz rod 5, a longitudinal reflecting gutter 19, the apex of which has a longitudinal connection gap 20. This gap corresponds to the distance separating two adjacent edges 12 and 13, and its width may vary during operation in function of the evolution of the variations of power, and, consequently, of temperatures. To avoid any loss of radiation towards the rear of the reflector, which would correspond moreover in this zone, to untimely heating, the rear of each gap 20 is closed off by covering it with a longitudinal shield 9, arranged in the manner illustrated in FIGS. 2 and 5. Thanks to this arrangement, it is certain that all of the radiation emitted by each rod 5 in all directions is returned towards the front of the panel 1.

For the realization of the assembly, the spar 4 preferably comprises a U-shaped section, the lower wing 21 of which is fitted by the notches 16 fitted to the corresponding end of each V-shaped element 8. Similarly, each spar 3 has a U-shaped section 22, the horizontal lower wing 23 of which has notches 16 for the corresponding end of each V-shaped element 8. After assembling the frame 2, 3, 4, it can be seen that the juxtaposed V-shaped elements 8 are each embedded at its ends, between the wings 21 and 23 so that this embedding allows the free development of deformations of variable expansions.

Each electrical connection pad 6 is preferably constituted by a metallic connection lug 24, equipping a horizontal support wing 25 of the beam 3, with interposition of sleeves 26 of insulating material. The lower metal end of each stud 24 is connected to a supply tab 27, which supports the corresponding end of the quartz cane 5, while ensuring its electrical supply.

The shields 9 covering two folded legs 14 and 15 juxtaposed (FIGS. 2 and 5) are preferably held in place by engagement under the upper wing 28 or 29, of the corresponding U-shaped iron, 4 or 22.

Of course, the transverse profile of each reflecting gutter 19 can correspond to any suitable mathematical form, in particular circular, elliptical or parabolic. Much better, one can spread more or less two adjacent reflecting gutters by increasing the width of the gap 20, which makes it possible to vary the overall shape of the reflecting section of the gutter 19. For example, this can make it possible to use two incandescent filaments juxtaposed in one or two quartz rods 5 placed side by side. In each case, the width 18 of the shield 9 is calculated accordingly, to completely mask the radiation towards the rear passing through the gap 20.

Finally, we note that two contiguous gutters 19 are only separated by an edge 30 of zero width: no width is therefore lost between the gutters 19, which increases the radiation power of the assembly for the same size of the panel 1 , and can accommodate a larger number of quartz canes 5.

As explained above, it is possible to further improve the performance of the device, in particular when the infrared radiation is of high intensity.

Figures 6, 7 and 12 show a reflector element in the form of two half-gutters, produced by assembling two elementary parts 31 and 32.

The part 31 is made of folded sheet metal, in a V-shaped cross section with two curvilinear branches 33 and 34, each surmounted by a vertical flange referenced respectively 35 and 36.

The part 32 has a cross section identical to that of the part 31 (FIG. 6).

To carry out the assembly, the part 31 is embedded in the part 32, which is accompanied by an elastic deformation to engage the edges 35 and 36 of the part 31 between the edges 45 and 46 of the part 32. The amplitude of this deformation corresponds to the thickness 37 of the sheet of each of these parts. The interlocking of parts 31 and 32 into one another is not carried out completely, so as to leave between them, a gap 38 corresponding to a double wall extending over the entire length of the curved wings of the section in V.

To complete the assembly, a weld bead 39 is placed on each side, which joins the flanges 35 and 45, and 40, to join the flanges 36 and 46.

Similarly, the rear shield of the reflector is defined by fitting one into the other of two parts 41 and 42, identical to each other. The part 41 is made of sheet metal folded along a cross section in an arc of a circle 43, raised at each end along two flanges 47 and 48.

The part 42 also has a cross section in an arc 44, located between two flanges 49 and 50.

To make the shield 41, 42, of FIG. 8, the part 41 is forced into place between the flanges 49 and 50 of the part 42. This movement is carried out with a elastic deformation, the magnitude of which corresponds to the thickness of the sheet. The embedding is not carried out completely, so as to leave between the two arcs 43 and 44, a free gap 51 (Figure 12).

Here again, the assembly is carried out by placing a weld bead 52 on the flanges 47 and 49, while a similar weld bead 53 assembles the flanges 48 and 50.

In the variant illustrated in FIGS. 10 to 13, each element in two half-gutters 54 is produced in one piece in the form of a folded sheet metal strip, the cross section of which defines as above, the two curved wings 33 and 34 of a V, and the two lateral flanges 35 and 36. Here, on the other hand, these two flanges are each surmounted by a longitudinal tab 55, 56. These two tabs are folded one in the direction of the other, and they overlap in their connection zone, where they are assembled by a weld bead 57. The reflective element 54 is therefore in the form of a tube whose cross section has substantially the shape of a triangle, whose two sides are curvilinear.

Likewise, each shield 58 of this reflector is formed by folding over itself a single sheet metal strip, with a cross section which comprises an arc of a circle 44, taken between two folded edges 49 and 50, which two legs extend longitudinal 59 and 60, folded towards each other, up to their connection zone where they overlap. In this zone, a weld bead 51 completes the assembly.

The operation is as follows.

• - deux éléments en demi-gouttières, référencés 31, 32 (variante de la Figure 12), ou 54 (variante de la Figure 13) ;
• - un bouclier arrière référencé 41, 42, sur la Figure 12 et 58 sur la Figure 13.

On the heating appliance, each tube 61 emitting infrared radiation finds behind it an area of the reflector which comprises:

• - two elements in half gutters, reference ces 31, 32 (variant of Figure 12), or 54 (variant of Figure 13);
• - a rear shield referenced 41, 42 in Figure 12 and 58 in Figure 13.

It is known that these reflective elements are sufficient to protect the rear zone of the device (the top of each Figure 12 or 13) against any untimely loss or inadvertent leakage of infrared radiation towards this direction.

In the context of the present invention, each of the elements 31, 32, 41, 42 or 54, 58, of the reflector being made with double wall, it has an interior space 38, 51 or 62, 63, in which a refrigerant, for example air, or even water.

Thanks to this arrangement, the heating power of the tubes 61 can be considerably increased, while keeping the entire reflector at a relatively low temperature. This protects, among other things, the rear area of the reflector against inadvertent overheating.

As indicated, the presence of a gap between two neighboring reflective elements generates both the loss of infrared radiation and causes excessive heating of the rear region of the cassette.

To overcome these drawbacks, a shield can be provided as shown in Figures 14 to 19.

FIG. 14 shows a part of a cassette of known type, used as a generator of infrared radiation.

This cassette notably comprises radiation emitting tubes 71, each located opposite a reflective gutter 72. The entire reflector is formed by a juxtaposition of several elements reflectors 73, each having a V-shaped cross section, the two wings of which are concave. The base of the V of each element 73 defines a longitudinal edge 74. Thus, each gutter 72 is defined between two successive edges 74, formed by two half-gutters 75 and 76, corresponding to two different elements 73. The junction between the two half-gutters 75 and 76 takes place at the bottom of the gutter 72, along a longitudinal gap 77.

• - d'une part, un espace libre 80 bien défini doit être laissé entre le bouclier 79 et l'interstice 77 pour ne pas troubler l'écoulement de l'air de refroidissement ;
• - d'autre part, cela oblige à conférer au bouclier 79, une largeur 81 relativement importante, très supérieure à la largeur de l'interstice 77.

To prevent the radiation emitted by the tube 71 from being lost by diffusion through the gap 77, towards the posterior zone 78 of the cassette, it can be envisaged to install a shield 79, constituted by a rigid shallow gutter . It can be seen in FIG. 14 that the installation of the shields 79 appreciably complicates the manufacture of the entire cassette, given that:

• - On the one hand, a well-defined free space 80 must be left between the shield 79 and the gap 77 so as not to disturb the flow of the cooling air;
• - on the other hand, this makes it necessary to give the shield 79, a relatively large width 81, much greater than the width of the gap 77.

According to the invention (Figures 15 to 17), no shield of this type is now provided behind the interstice 77. This interstice 77 remains hidden from radiation by a shield 82, but the innovation is that the shield 82 is located in front of the gap 77.

In the variant illustrated in FIGS. 15 and 16, the shield is formed by a narrow metallic or ceramic strip, deposited directly on the wall of the emitter tube 83. In other words, each emitter tube 83 according to the invention is then provided with its own shield 82, visible in the form of a narrow metal strip, arranged longitudinally on the wall of the tube.

In the variant illustrated in Figures 15 and 17, the metal strip 82 constituting the shield is produced on the contrary in the form of a removable strip, that is to say a narrow strip of sheet metal than elastic staples 84 allow to snap lightly on the tube 83.

In the variant illustrated in FIGS. 18 and 19, the metal strip 82 constituting the shield is provided, on its back, with hooking clips 85, each of which is formed by a tubular spacer 86, by a screw 87, and a bar 88 which can be removably hooked (Figure 18) on the ribs 89 located at the top of the two half-gutters 75 and 76, on either side of the gap 77. Thus, after assembly (Figure 18), the shield 82 is fixed between the tube 71 and the gap 77 which it masks, while allowing the air to circulate freely therein.

Claims (26)

1. Device for the production and reflection of infrared radiation presented in the form of a panel (1) grouping several emitting rods (5) behind which are reflective means, characterized in that the rods (5) are arranged at equal distance and parallel to each other, inside a rectangular frame (2), (3), (4), while, behind the rods (5), is a reflector (7) whose the overall shape is constituted by a succession of concave gutters (19), each placed behind a transmitting rod (5), each gutter (19) being defined by the juxtaposition of two longitudinal elements (8), each of which has a section transverse in V, the two branches of which are concave towards the outside, the junction gap (20) of two juxtaposed elements (8) being masked by a reflecting longitudinal shield (9) placed at this point behind the two elements (8 ), each of which is self-supporting. 2. Device according to claim 1, characterized in that each of the longitudinal elements (8) with a biconcave V section consists of a sheet folded along this V profile, so that it is not only self-supporting, but also susceptible to deform elastically under the effect of variable thermal stresses, such as those encountered for example if one varies, during operation, the radiation power, and therefore the wavelength of the rays emitted by the quartz rod (5). 3. Device according to one of claims 1 or 2, characterized in that each V-shaped element (8) has two lateral faces (10) and (11) concave towards the outside, each of them being surmounted by a flange (12) or (13), itself surmounted by a leg (14) or (15), slightly folded inwards, so well that, when several elements (8) are juxtaposed, a longitudinal gap (20) is defined, between each edge (12) of an element, and the neighboring edge (13) of the adjacent element (8). 4. Device according to any one of claims 1 to 3, characterized in that each reflector comprises a juxtaposition of rear shields and elements in two half gutters, and in that at least the elements in two half gutters (31), (32) or (54) are hollow, their interior space (38), (62) being traversed by a cooling fluid. 5. Device according to claim 4, characterized in that the rear shields (41), (42) or (58) are also hollow and double-walled, their interior space (51), (63) being traversed by a fluid cooling. 6. Device according to one of claims 4 or 5, characterized in that the cooling fluid which circulates in the double walls of the reflector is blown air. 7. Device according to any one of claims 4 to 6, characterized in that each element in two half-gutters is made by fitting one into the other two parts (31), (32) identical to each other, in sheet bent along a V-shaped cross section with wings (33), (34) curved, each surmounted by a vertical edge (35), (45) and (36, (46), the assembly being ensured by a weld bead (39) to connect the flanges (35) and (45), and by a weld bead (40), to connect the flanges (36) and (46). 8. Device according to any one of claims 4 to 6, characterized in that each rear shield is made by embedding one in the other two parts (41), (42) identical to each other, in sheet folded in a cross section in an arc (43), (44), surmounted by two vertical end flanges (47), (49) and (48), (50), the assembly being provided by a weld bead (52) to connect the flanges (47) and (49), and by a weld bead (53) to connect the flanges (48) and (50). 9. Device according to any one of claims 4 to 6, characterized in that each element in two half-gutters is made by folding a strip of sheet metal closed on itself by a longitudinal weld bead (57) with a triangular cross section of which two sides (33) and (34) are curvilinear, connected by two rectilinear flanges (35) and (36). 10. Device according to any one of claims 4 to 6, characterized in that each rear shield (58) is made by folding a strip of sheet metal closed on itself by a longitudinal weld bead (61), with a circular arc cross section (44) connected by two vertical edges (49), (50) to the flat upper bottom (59), (60). 11. Device according to any one of the preceding claims, characterized in that each V-shaped element of the reflector (9a) has at least its reflecting surface constituted by a layer or a sheet of gold, or of another reflecting metal. . 12. Device according to any one of claims 1 to 3, intended to mask the radiation emitted by a tube (83) in the direction of a gap (77) defined in the reflector located behind this tube, characterized in that the shield consists of an opaque strip (82) applied along a part of the rear surface of the radiating tube (83) made of metal or ceramic. 13. Device according to claim 12, characterized in that the opaque strip (82) forming the shield consists of a metallization deposit made directly on the wall of the tube (83), which then takes the form of a tube ordinary (71) metallized only along a reflective strip. 14. Device according to claim 12, characterized in that the shield (82) is constituted by a concave metal strip, made of sheet metal, attached against a part of the rear longitudinal wall of the tube (83). 15. Device according to claim 14, characterized in that the width of the metal strip in the form of a gutter is significantly less than the diameter of the tube (71). 16. Device according to claim 14, characterized in that the concave metal gutter constituting the shield (82) is fixed to the tube (71) by elastic clipping, so that, when changing a tube (71), it is possible use the shield (82) of the old one on the new tube (71). 17. Device according to claims 14 and 16, characterized in that the removable clipping of the metal strip is ensured by elastic tabs (84). 18. Infrared radiation tube intended to equip a device according to claims 12 and 13, characterized in that it comprises, over its length, an opaque strip (82) of a width less than its diameter, made of metal or ceramic . 19. Device according to claim 12, characterized in that the shield (82) consists of a concave opaque strip (82) of sheet metal, provided with hooking clips (85) which can be hooked detachably on the ribs (89) equipping the top of the two half-gutters (75) and (76), the shield (82) then being kept at a distance between the emitter tube (71) and the gap (77) which it conceals without interrupting air circulation. 20. Device according to claim 19, characterized in that each clip (85) comprises a tubular spacer (86), a connecting screw (87) and a clip bar (88). 21. Device according to any one of the preceding claims, characterized in that the panel (1) is constituted by a frame formed by two crosspieces (2) and two longitudinal members (3) and (4), the transmitter rods (5 ) being arranged side by side parallel to the crosspieces (2). 22. Device according to any one of the preceding claims, characterized in that at each end of a V-shaped element (8), a longitudinal notch (16) is provided in each of the vertical flanges (12) and (13) . 23. Device according to any one of claims 1 to 12, 21 or 22, characterized in that each shield (9) consists of a simple strip of curved sheet metal in a concave transverse profile, which allows it to be him also, self-supporting, after its installation where it covers the rear part of the corresponding longitudinal gap (20). 24. Device according to any one of claims 1 to 12, 21 to 23, characterized in that the juxtaposition of the V-shaped elements (8) defines around each quartz rod (5), a longitudinal reflecting gutter (19), the top of which has a longitudinal connection gap (20) and the width of which can vary during operation. 25. Device according to any one of claims 1 to 12, 21 to 24, characterized in that a horizontal wing (23) is provided along the spar (3), while opposite, a longitudinal wing (21 ) is provided along the spar (4), each V-shaped element (8) having the notches (16) of one of its ends engaged on the wing (23) of the spar (3), while its notches (16 ) equipping its opposite end are engaged on the wing (21) of the beam (4). 26. Device according to any one of claims 1 to 12, 21 to 25, characterized in that, in the panel (1), two contiguous gutters (19) are only separated by a longitudinal edge (30) of practically width nothing.

Images