EP1068470A1 - Polyhedral tank designed for containing fluids under pressure - Google Patents

Polyhedral tank designed for containing fluids under pressure

Info

Publication number
EP1068470A1
EP1068470A1 EP99910427A EP99910427A EP1068470A1 EP 1068470 A1 EP1068470 A1 EP 1068470A1 EP 99910427 A EP99910427 A EP 99910427A EP 99910427 A EP99910427 A EP 99910427A EP 1068470 A1 EP1068470 A1 EP 1068470A1
Authority
EP
European Patent Office
Prior art keywords
walls
core
reservoir
tank according
skin
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Withdrawn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
EP99910427A
Other languages
German (de)
French (fr)
Inventor
Gérard VENGEON
Philippe Parisot
Guy Sahuc
Eric Petitpas
Bruno Lebrun
Gérard DAMONT
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.)
Giat Industries SA
Original Assignee
Giat Industries 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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP1068470A1 publication Critical patent/EP1068470A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/08—Integral reinforcements, e.g. ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K15/00—Arrangement in connection with fuel supply of combustion engines or other fuel consuming energy converters, e.g. fuel cells; Mounting or construction of fuel tanks
    • B60K15/03—Fuel tanks
    • B60K15/03006—Gas tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0147—Shape complex
    • F17C2201/0157—Polygonal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/035—High pressure (>10 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/036—Very high pressure (>80 bar)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • F17C2270/0178—Cars

Definitions

  • the technical sector of the present invention relates to tanks intended to contain pressurized fluids, and more particularly to liquefied petroleum gas tanks called LPG for motor vehicles.
  • the devices intended to contain pressurized fluids are obtained from a metal sheet formed to obtain a substantially cylindrical reservoir, the ends of which are in the form of a portion of a sphere. This shape is well suited for uniformly distributing the stresses around the periphery of the tank.
  • LPG tanks used for example in cars are generally cylindrical or toric, conventionally metallic and preferably steel.
  • the toroidal tanks are mounted at the location of the spare tire. Their capacity is limited due to the lack of space available at this location of the vehicle. Cylindrical tanks are generally arranged at the bottom of the trunk of the automobile, where they considerably reduce the volume thereof, the more so as the compartment which is intended to accommodate them is parallelepipedic and that the volume comprised between the angles of the compartment and the arc of the tank is empty. There is a loss of useful volume, both for the trunk and for the tank.
  • Cylindrical tanks can also be mounted under the rear overhang trunk.
  • the available space is limited in height, which requires the use of a small diameter cylindrical tank, or several small diameter cylindrical tanks connected together by a pipe welded radially on the periphery of the cylinders. This solution, if it makes it possible to obtain a large volume without encroaching on the volume of the trunk, is 2
  • toric and cylindrical tanks are therefore not fully satisfactory, because they are often required to be mounted in compartments of parallelepiped shape whose available space is not optimally used.
  • rectangular tanks have been proposed. Their shape includes edges conducive to the initiation of rupture. The reservoir does not deform homogeneously over its entire periphery and the edges constitute zones of compound stress where the stress is applied in a multidirectional manner.
  • These tanks have the disadvantage, compared to cylindrical or toric tanks of the same capacity and the same mechanical strength, of being much heavier, because thicker walls have to be provided. In addition, these tanks are still heavy and sensitive to the mechanical stresses involved in the storage of pressurized fluid. They are therefore not entirely satisfactory.
  • the object of the present invention is to propose a tank having an external shape capable of being housed in automobile compartments with shapes composed by parallelepipeds, while being light and having good mechanical characteristics to resist the internal pressure involved. by storing the fluid.
  • the tank must also be able to withstand external stresses, such as an impact, when the vehicle is damaged in an accident.
  • the tank must be able to withstand the increase in the internal pressure of the fluid in the event of a vehicle fire.
  • the present invention relates to a reservoir intended to contain pressure fluid, characterized in that it has a polyhedral external shape whose walls of the faces constitute a sandwich structure giving it multidirectional resistance to the pressure.
  • the sandwich structure of the walls is constituted on the one hand by an external skin and an internal skin in compact material and on the other hand by a core of porous or cellular material, said core being surrounded on its external face by said external skin and on its internal face by said internal skin.
  • the core of the sandwich structure of the walls is made of a honeycomb or foam type material.
  • the thickness of each of the walls of the polyhedron is variable.
  • each of the polyhedron walls is minimum in the vicinity of the tank angles and is maximum in their middle part.
  • At least one of the walls of the reservoir has a curvilinear, paraboloidal or ellipsoidal shape in contact with the fluid under pressure.
  • the walls of the tank have rounded or filleted connections between them.
  • the adjoining walls are connected by a wall element having greater strength and density.
  • the reservoir has a rectangular parallelepiped shape.
  • An advantage of the tank according to the invention consists in the fact that its wall has angular parts and can occupy all the available space offered by an automobile compartment comprising shapes composed by the parallelepipeds and therefore sharp angles. 4
  • Another advantage of the tank according to the invention consists in that the structure of the walls of the tank is light because it is hollowed out.
  • Another advantage of the tank according to the invention consists in that the structure of its walls allows a better distribution of the stresses and a greater inertia of the walls with respect to mechanical and thermal stresses.
  • a new advantage of the reservoir which is the subject of the invention lies in the fact that it is devoid of sharp edges conducive to the initiation of rupture.
  • FIG. 1 is a three-dimensional view with a partial section through an edge of a parallelepiped tank according to the invention
  • FIG. 2 is a view in longitudinal section of a parallelepiped tank according to the invention, the walls of which are of constant thickness,
  • - Figure 3 is a longitudinal sectional view of a parallelepiped tank according to the invention whose walls are of variable thickness
  • - Figure 4 is a longitudinal section of a parallelepiped tank according to the invention whose walls are 'variable thickness and whose edges include fillets.
  • FIG. 5 is a partial longitudinal section view showing the core of the walls at the location of the leaves at the intersection of two faces of a parallelepiped tank according to the invention as shown in FIG. 4,
  • FIG. 6 is a partial longitudinal sectional view showing the core of the walls at the location of 5
  • FIG. 7 is a view in longitudinal section d 'an embodiment of a polyhedral tank according to the invention.
  • the reservoir 1 is a strictly parallelepipedic reservoir.
  • Each face or side wall is constituted by a thick plate which comprises several layers: an outer layer 2 in the form of a thin skin of metallic material, an intermediate layer or core 3 of very thick in hollow metallic material or plastic under honeycomb or foam form and an internal layer 4 in the form of a thin skin of metallic material.
  • the thickness of the core 3 is constant at all points on the different faces of the tank 1.
  • the material constituting the core 3 must have good mechanical characteristics in a multidirectional manner. By low thickness is meant a value less than about mm and by high thickness a value greater than about 5mm.
  • the parallelepipedic tank 1 can be formed by two sandwich wall half shells welded or optionally assembled by adhesive.
  • the internal and external skins can consist of two half shells 5, 6, 7, 8 formed from plates welded together at the edges of the parallelepiped.
  • the core 3 can be made of material in the honeycomb form, for example a material of the honeycomb type which is cut in the shape of a half-shell.
  • An internal half-shell 5, 6 and an external half-shell 7, 8 are placed so as to surround a half-shell 9, 10 of the core 3 made of honeycomb type material and are secured to the core 3 by 6
  • the core 3 can be of hollow material, for example in the form of foam and preferably a foam of polyethylene, polypropylene, polyvinyl chloride ...
  • the half shells of the sandwich wall are obtained by injection of the polymer forming the foam between an inner half shell 5, 6 and an outer half shell 7, 8.
  • FIG. 3 An embodiment of a highly resistant parallelepiped tank 1 is shown in Figure 3. Each wall is thick and has several layers. In the longitudinal section view of the tank, the sides shown are rectilinear on their external face. The external face is constituted by a thin skin 2 of constant thickness in the form of solid or compact material. The external face surrounds the thick core 3 made of hollow material in the honeycomb or foam form. We see in this figure that the thickness of the core 3 is variable.
  • a preferred embodiment of the parallelepiped tank according to the invention is shown in Figure 4. It consists of a parallelepiped whose edges have rounded or leave 12. Each wall is thick and has several layers. In the longitudinal section view of the reservoir, the sides shown are rectilinear on their external face and are connected by a rounded or fillet 12.
  • the external face consists of a thin skin 2 of constant thickness in the form of compact material.
  • the external face surrounds a thick core 3 of hollow material in the honeycomb or foam form.
  • the thickness of the core 3 is variable. The thickness of the core 3 is greater at the intersection of the diagonals of each face of the parallelepiped and decreases in the vicinity of the edges of the parallelepiped to reach a small thickness.
  • the thickness does not vary linearly, but curvilinearly, here in an arc.
  • the sides of the internal skin 4 shown are connected by a rounded or fillet 13.
  • the thickness of the core 3 of a face can decrease in the vicinity of an edge to a minimum value, then grow at the leave level.
  • the thickness of the core in extension may possibly decrease in the vicinity of the edge then decrease again to become maximum at its median part.
  • the thickness of the wall in line with the edge may be substantially equal to the maximum thickness of the core 3.
  • FIG. 5 shows the core 3 at the location of the leaves 12, 13 at the intersection of two contiguous walls of the reservoir.
  • the core 3 is not made up uniformly of the same material having the same mechanical characteristics.
  • the core 3 consists of a polymer foam, two adjoining walls A and C of which are connected by a wall element B. 8
  • each portion A, B, C of the core 3 is delimited by the internal and external surfaces of the core and a plane connecting the lines located at the intersection of the internal and external surfaces of the faces of the reservoir and of the leaves 12, 13.
  • the thickness of the portion B may be greater at the intersection of the two adjacent walls and decrease on both sides at the level of the portion A or C, then increase and become maximum in their central part.
  • the portions corresponding to the sides of larger surface are denser and have higher mechanical characteristics than those corresponding to the sides smaller area.
  • the tank angles are dense and have high mechanical characteristics.
  • the dimensions of the core of the walls at the location of the leaves at the intersection of two faces of a parallelepiped tank are defined in the table following (the dimensions h c and l c make it possible to construct the curvature in an arc of a circle of the embodiments represented in FIGS. 3 and 4:
  • the mass of such a tank is of the order of 36 kg for a useful volume of 70 liters. It has been found that the maximum stress is always located at the level of the internal skin of the internal leave and reaches a high value. At the level of the external skin, the maximum stress reaches a much lower value.
  • FIG. 7 shows an alternative embodiment of a tank 1 which is the subject of the invention, the shape of which is not strictly parallelepipedal, but of polyhedral shape, in order to be able to be housed in a compartment of the vehicle of irregular shape.
  • the edges of the polyhedron have fillets 12.
  • the reservoir is composed of an external skin 2 and internal skin 4 of compact material sandwiching a core 3 of porous or cellular material.
  • the thickness of the core 3 is not constant. In the case of a complex polyhedral shape, the thickness of the core 3 is not necessarily minimum at the level of the leaves 12, 13 and nor necessarily maximum around the intersection of the diagonals of each face of the polyhedron. 10
  • the polyhedral reservoir 1 represented can be in several volumes of distinct geometrical shape: a first parallelepipedic volume X on one side of which is grafted a second prismatic volume Y and a third parallelepipedic volume Z.
  • a variant has also been represented according to which the second volume Y can be provided with a reinforcement 14 and the third volume Z with another reinforcement 15, these two reinforcements being arranged transversely to join two opposite side walls.
  • These reinforcements 14 and 15 constitute internal stiffeners to reinforce the zones where higher stresses prevail, for example at the level of zones Y and Z.
  • these reinforcements 14 and 15 are perforated without sharp angles to ensure communication between the different compartments delimited by these reinforcements.
  • the embodiments of the tank according to the invention described above and shown in the figures are in no way limiting and may give rise to variants.
  • the internal and external skins may for example not be of constant thickness.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The invention concerns a tank (1) designed to contain a fluid under pressure, having an external polyhedral shape whereof the walls constitute a sandwich structure providing it with a multidirectional resistance to pressure. The sandwich structure of the walls is formed by an outer skin (2) and an inner skin (4) made from a compact material and by a core (3) made from a porous or alveolate material, said core (3) being enclosed on its outer surface by said outer skin and on its inner surface by said inner skin (4) The wall sandwich structure is made from a honeycomb or foam material. The invention is applicable to motor vehicles.

Description

1 1
RESERVOIR POLYEDRIQUE DESTINE A CONTENIR DES FLUIDES SOUS PRESSIONPOLYEDRIC TANK FOR CONTAINING PRESSURIZED FLUIDS
Le secteur technique de la présente invention concerne les réservoirs destinés à contenir des fluides sous pression, et plus particulièrement les réservoirs de gaz de pétrole liquéfié dit GPL pour véhicules automobiles. Généralement, les dispositifs destinés à contenir des fluides sous pression sont obtenus à partir d'une feuille métallique formée pour obtenir un réservoir sensiblement cylindrique dont les extrémités se présentent sous la forme d'une portion de sphère. Cette forme est bien adaptée pour répartir uniformément les contraintes sur la périphérie du réservoir.The technical sector of the present invention relates to tanks intended to contain pressurized fluids, and more particularly to liquefied petroleum gas tanks called LPG for motor vehicles. Generally, the devices intended to contain pressurized fluids are obtained from a metal sheet formed to obtain a substantially cylindrical reservoir, the ends of which are in the form of a portion of a sphere. This shape is well suited for uniformly distributing the stresses around the periphery of the tank.
Les réservoirs GPL utilisés par exemple dans les automobiles sont généralement cylindriques ou toriques, classiquement métalliques et de préférence en acier.LPG tanks used for example in cars are generally cylindrical or toric, conventionally metallic and preferably steel.
Les réservoirs toriques sont montés à l'emplacement de la roue de secours. Leur capacité est limitée du fait du manque de place disponible à cet emplacement du véhicule. Les réservoirs cylindriques sont généralement disposés au fond du coffre de l'automobile, où ils réduisent de façon considérable le volume de celui-ci, d' autant que le compartiment qui est destiné à les accueillir est parallélépipédique et que le volume compris entre les angles du compartiment et l'arc de cercle du réservoir est vide. Il y a une perte du volume utile, tant pour le coffre que pour le réservoir.The toroidal tanks are mounted at the location of the spare tire. Their capacity is limited due to the lack of space available at this location of the vehicle. Cylindrical tanks are generally arranged at the bottom of the trunk of the automobile, where they considerably reduce the volume thereof, the more so as the compartment which is intended to accommodate them is parallelepipedic and that the volume comprised between the angles of the compartment and the arc of the tank is empty. There is a loss of useful volume, both for the trunk and for the tank.
Les réservoirs cylindriques peuvent également être montés sous le coffre en porte à faux arrière. L'espace disponible est limité en hauteur, ce qui oblige à utiliser un réservoir cylindrique de petit diamètre, ou plusieurs réservoirs cylindriques de petit diamètre reliés entre eux par un tuyau soudé radialement sur la périphérie des cylindres. Cette solution, si elle permet d'obtenir un grand volume sans empiéter sur le volume du coffre, est 2Cylindrical tanks can also be mounted under the rear overhang trunk. The available space is limited in height, which requires the use of a small diameter cylindrical tank, or several small diameter cylindrical tanks connected together by a pipe welded radially on the periphery of the cylinders. This solution, if it makes it possible to obtain a large volume without encroaching on the volume of the trunk, is 2
néanmoins coûteuse et ne permet pas d'utiliser de façon optimale le volume disponible sous le coffre puisqu' il subsiste une partie vide entre les deux réservoirs cylindriques accolés. Les réservoirs toriques et cylindriques ne donnent donc pas pleinement satisfaction, car ils sont souvent amenés à être montés dans des compartiments de forme parallélépipédique dont l'espace disponible n'est pas utilisé de façon optimale. Afin de pallier ces inconvénients, on a proposé des réservoirs parallélépipédiques. Leur forme comporte des arêtes propices aux amorces de rupture. Le réservoir ne se déforme pas de façon homogène sur toute sa périphérie et les arêtes constituent des zones de sollicitation composée où la contrainte est appliquée de façon multidirectionnelle. Ces réservoirs présentent l'inconvénient, par rapport à des réservoirs cylindriques ou toriques de même capacité et de même résistance mécanique, d'être beaucoup plus lourds, car il faut prévoir des parois plus épaisses. De plus, ces réservoirs sont encore lourds et sensibles aux sollicitations mécaniques qu'implique le stockage de fluide sous pression. Ils ne donnent donc pas entière satisfaction.nevertheless expensive and does not allow optimal use of the volume available under the trunk since there remains an empty part between the two adjoining cylindrical tanks. The toric and cylindrical tanks are therefore not fully satisfactory, because they are often required to be mounted in compartments of parallelepiped shape whose available space is not optimally used. In order to overcome these drawbacks, rectangular tanks have been proposed. Their shape includes edges conducive to the initiation of rupture. The reservoir does not deform homogeneously over its entire periphery and the edges constitute zones of compound stress where the stress is applied in a multidirectional manner. These tanks have the disadvantage, compared to cylindrical or toric tanks of the same capacity and the same mechanical strength, of being much heavier, because thicker walls have to be provided. In addition, these tanks are still heavy and sensitive to the mechanical stresses involved in the storage of pressurized fluid. They are therefore not entirely satisfactory.
Le but de la présente invention est de proposer un réservoir présentant une forme extérieure apte à être logé dans des compartiments d' automobile aux formes composées par des parallélépipèdes, tout en étant léger et en ayant de bonnes caractéristiques mécaniques pour résister à la pression interne impliquée par le stockage du fluide. De plus, le réservoir doit pouvoir aussi résister à des sollicitations externes, tel un choc, lorsque le véhicule est endommagé lors d'un accident. Enfin, le réservoir doit pouvoir résister à l'augmentation de la pression interne du fluide en cas d'incendie du véhicule. 3The object of the present invention is to propose a tank having an external shape capable of being housed in automobile compartments with shapes composed by parallelepipeds, while being light and having good mechanical characteristics to resist the internal pressure involved. by storing the fluid. In addition, the tank must also be able to withstand external stresses, such as an impact, when the vehicle is damaged in an accident. Finally, the tank must be able to withstand the increase in the internal pressure of the fluid in the event of a vehicle fire. 3
Afin d'atteindre à ces objectifs, la présente invention a pour objet un réservoir destiné à contenir du fluide pression, caractérisé en ce qu'il présente une forme extérieure polyédrique dont les parois des faces constituent une structure sandwich lui conférant une résistance multidirectionnelle à la pression.In order to achieve these objectives, the present invention relates to a reservoir intended to contain pressure fluid, characterized in that it has a polyhedral external shape whose walls of the faces constitute a sandwich structure giving it multidirectional resistance to the pressure.
La structure sandwich des parois est constituée d'une part par une peau externe et une peau interne en matériau compact et d' autre part par une âme en matériau poreux ou alvéolé, ladite âme étant entourée sur sa face externe par ladite peau externe et sur sa face interne par ladite peau interne.The sandwich structure of the walls is constituted on the one hand by an external skin and an internal skin in compact material and on the other hand by a core of porous or cellular material, said core being surrounded on its external face by said external skin and on its internal face by said internal skin.
L' âme de la structure sandwich des parois est en matériau de type nid d'abeille ou mousse. L'épaisseur de chacune des parois du polyèdre est variable.The core of the sandwich structure of the walls is made of a honeycomb or foam type material. The thickness of each of the walls of the polyhedron is variable.
L' épaisseur de chacune des parois du polyèdre est minimale au voisinage des angles du réservoir et est maximale de leur partie médiane. Au moins une des parois du réservoir présente une forme curviligne, paraboloïdale ou ellipsoïdale en contact avec le fluide sous pression.The thickness of each of the polyhedron walls is minimum in the vicinity of the tank angles and is maximum in their middle part. At least one of the walls of the reservoir has a curvilinear, paraboloidal or ellipsoidal shape in contact with the fluid under pressure.
Les parois du réservoir comportent entre elles des raccordements arrondis ou congés. Les parois contiguës sont raccordées par un élément de paroi présentant une résistance et une densité plus grande.The walls of the tank have rounded or filleted connections between them. The adjoining walls are connected by a wall element having greater strength and density.
Le réservoir présente une forme extérieure parallélépipédique .The reservoir has a rectangular parallelepiped shape.
Un avantage du réservoir selon l'invention consiste dans le fait que sa paroi comporte des parties anguleuses et peut occuper tout l'espace disponible proposé par un compartiment d'automobile comportant des formes composées par les parallélépipèdes et donc des angles vifs. 4An advantage of the tank according to the invention consists in the fact that its wall has angular parts and can occupy all the available space offered by an automobile compartment comprising shapes composed by the parallelepipeds and therefore sharp angles. 4
Un autre avantage du réservoir selon l'invention consiste en ce que la structure des parois du réservoir est légère car évidée.Another advantage of the tank according to the invention consists in that the structure of the walls of the tank is light because it is hollowed out.
Un autre avantage du réservoir selon l'invention consiste en ce que la structure de ses parois permet une meilleure répartition des contraintes et une plus grande inertie des parois vis à vis des sollicitations mécaniques et thermiques.Another advantage of the tank according to the invention consists in that the structure of its walls allows a better distribution of the stresses and a greater inertia of the walls with respect to mechanical and thermal stresses.
Un nouvel avantage du réservoir objet de l'invention réside dans le fait qu'il est dépourvu d'arêtes vives propices aux amorces de rupture.A new advantage of the reservoir which is the subject of the invention lies in the fact that it is devoid of sharp edges conducive to the initiation of rupture.
D'autres caractéristiques, détails et avantages de l'invention ressortiront plus clairement à la lecture du complément de description donné ci-après à titre d'illustration en relation avec des dessins sur lesquels :Other characteristics, details and advantages of the invention will emerge more clearly on reading the additional description given below by way of illustration in relation to the drawings in which:
- la figure 1 est une vue en trois dimensions avec une coupe partielle à une arête d'un réservoir parallélépipédique selon l'invention,FIG. 1 is a three-dimensional view with a partial section through an edge of a parallelepiped tank according to the invention,
- la figure 2 est une vue en coupe longitudinale d'un réservoir parallélépipédique selon l'invention dont les parois sont d'épaisseur constante,FIG. 2 is a view in longitudinal section of a parallelepiped tank according to the invention, the walls of which are of constant thickness,
- la figure 3 est une vue en coupe longitudinale d'un réservoir parallélépipédique selon l'invention dont les parois sont d'épaisseur variable, - la figure 4 est une coupe longitudinale d'un réservoir parallélépipédique selon l'invention dont les parois sont d' épaisseur variable et dont les arêtes comportent des congés.- Figure 3 is a longitudinal sectional view of a parallelepiped tank according to the invention whose walls are of variable thickness, - Figure 4 is a longitudinal section of a parallelepiped tank according to the invention whose walls are 'variable thickness and whose edges include fillets.
- la figure 5 est une vue en coupe longitudinale partielle, montrant l'âme des parois à l'emplacement des congés à l'intersection de deux faces d'un réservoir parallélépipédique selon l'invention tel que montré à la figure 4,FIG. 5 is a partial longitudinal section view showing the core of the walls at the location of the leaves at the intersection of two faces of a parallelepiped tank according to the invention as shown in FIG. 4,
- la figure 6 est une vue en coupe longitudinale partielle, montrant l'âme des parois à l'emplacement des 5- Figure 6 is a partial longitudinal sectional view showing the core of the walls at the location of 5
congés à l'intersection de deux faces d'un réservoir parallélépipédique selon l'invention tel que montré à la figure 4 ou à la figure 5, et détaillant les dimensions de l' âme, - la figure 7 est une vue en coupe longitudinale d'un exemple de réalisation d'un réservoir polyédrique selon l' invention.leaves at the intersection of two faces of a parallelepiped tank according to the invention as shown in FIG. 4 or in FIG. 5, and detailing the dimensions of the core, - FIG. 7 is a view in longitudinal section d 'an embodiment of a polyhedral tank according to the invention.
Dans la réalisation de l'invention représentée aux figures 1, 2 et 3, le réservoir 1 est un réservoir strictement parallélépipédique. Chaque face la ou paroi latérale est constituée par une plaque épaisse qui comporte plusieurs couches : une couche externe 2 sous forme d'une peau de faible épaisseur en matériau métallique, une couche intermédiaire ou âme 3 de forte épaisseur en matériau métallique ou plastique creux sous forme alvéolée ou de mousse et une couche interne 4 sous forme d'une peau de faible épaisseur en matériau métallique. L'épaisseur de l'âme 3 est constante en tout point des différentes faces du réservoir 1. De façon générale, le matériau constituant l'âme 3 doit avoir de bonnes caractéristiques mécaniques de façon multidirectionnelle. Par faible épaisseur, on entend une valeur inférieure au mm environ et par forte épaisseur une valeur supérieure à 5mm environ.In the embodiment of the invention shown in Figures 1, 2 and 3, the reservoir 1 is a strictly parallelepipedic reservoir. Each face or side wall is constituted by a thick plate which comprises several layers: an outer layer 2 in the form of a thin skin of metallic material, an intermediate layer or core 3 of very thick in hollow metallic material or plastic under honeycomb or foam form and an internal layer 4 in the form of a thin skin of metallic material. The thickness of the core 3 is constant at all points on the different faces of the tank 1. In general, the material constituting the core 3 must have good mechanical characteristics in a multidirectional manner. By low thickness is meant a value less than about mm and by high thickness a value greater than about 5mm.
Le réservoir 1 parallélépipédique peut être formé par deux demi coquilles de paroi sandwich soudées ou éventuellement assemblées par adhésif. Les peaux internes et externes peuvent être constituées de deux demi coquilles 5, 6, 7, 8 formées de plaques soudées entre elles aux arêtes du parallélépipède. L' âme 3 peut être en matériau sous forme alvéolée par exemple un matériau de type nid d' abeille qui est taillé en forme de demi coquille. Une demi coquille interne 5, 6 et une demi coquille externe 7, 8 sont placées de façon à entourer une demi coquilles 9, 10 de l'âme 3 en matériau de type nid d'abeille et sont solidarisées avec l'âme 3 par 6The parallelepipedic tank 1 can be formed by two sandwich wall half shells welded or optionally assembled by adhesive. The internal and external skins can consist of two half shells 5, 6, 7, 8 formed from plates welded together at the edges of the parallelepiped. The core 3 can be made of material in the honeycomb form, for example a material of the honeycomb type which is cut in the shape of a half-shell. An internal half-shell 5, 6 and an external half-shell 7, 8 are placed so as to surround a half-shell 9, 10 of the core 3 made of honeycomb type material and are secured to the core 3 by 6
soudage, comme le soudage laser, à travers les peaux internes et externes ou par le biais d'un adhésif.welding, like laser welding, through internal and external skins or through an adhesive.
L' âme 3 peut être en matériau creux par exemple sous forme de mousse et de façon préférentielle une mousse de polyéthylène, polypropylène, polychlorure de vinyle... Dans ce cas, les demi coquilles de paroi sandwich sont obtenues par injection du polymère formant la mousse entre une demi coquille interne 5, 6 et une demi coquille externe 7, 8.The core 3 can be of hollow material, for example in the form of foam and preferably a foam of polyethylene, polypropylene, polyvinyl chloride ... In this case, the half shells of the sandwich wall are obtained by injection of the polymer forming the foam between an inner half shell 5, 6 and an outer half shell 7, 8.
La structure ainsi obtenue permet d'emmagasiner l'énergie des contraintes engendrées par la pression et les déformations ne sont pas transmises à la peau externe. Cette technologie permet d'obtenir des réservoirs résistant à une pression de 30.105 Pa tout en présentant des formes extérieures très variées. Un mode de réalisation d'un réservoir 1 parallélépipédique très résistant est représenté à la figure 3. Chaque paroi est épaisse et comporte plusieurs couches. Sur la vue en coupe longitudinale du réservoir, les côtés représentés sont rectilignes sur leur face externe. La face externe est constituée par une peau mince 2 d' épaisseur constante sous forme de matériau plein ou compact. La face externe entoure l'âme 3 épaisse en matériau creux sous forme alvéolée ou de mousse. On voit sur cette figure que l'épaisseur de l'âme 3 est variable. Elle est importante à l'intersection des diagonales de chaque face du parallélépipède, autrement dit dans sa partie médiane, et décroît vers les arêtes du parallélépipède pour atteindre une épaisseur plus faible. L'épaisseur ne varie pas linéairement, mais de façon curviligne, ici en arc de cercle. Les bords de la peau interne 4 représentée se joignent en formant un angle α aiguë 11. On obtient un effet de voûte de la paroi interne et un rapport volume utile/masse de 1,59 environ à comparer avec ce même rapport de 1,1 pour un réservoir de même forme mais à simple paroi. 7The structure thus obtained makes it possible to store the energy of the stresses generated by the pressure and the deformations are not transmitted to the external skin. This technology makes it possible to obtain reservoirs resistant to a pressure of 30.10 5 Pa while having a wide variety of external shapes. An embodiment of a highly resistant parallelepiped tank 1 is shown in Figure 3. Each wall is thick and has several layers. In the longitudinal section view of the tank, the sides shown are rectilinear on their external face. The external face is constituted by a thin skin 2 of constant thickness in the form of solid or compact material. The external face surrounds the thick core 3 made of hollow material in the honeycomb or foam form. We see in this figure that the thickness of the core 3 is variable. It is important at the intersection of the diagonals of each face of the parallelepiped, in other words in its middle part, and decreases towards the edges of the parallelepiped to reach a smaller thickness. The thickness does not vary linearly, but curvilinearly, here in an arc. The edges of the internal skin 4 shown join at an acute angle α 11. An arch effect of the internal wall is obtained and a useful volume / mass ratio of approximately 1.59 to be compared with this same ratio of 1.1 for a tank of the same shape but with a single wall. 7
Une réalisation préférentielle du réservoir parallélépipédique selon l'invention est représentée à la figure 4. Il est constitué d'un parallélépipède dont les arêtes comportent des arrondis ou congés 12. Chaque paroi est épaisse et comporte plusieurs couches. Sur la vue en coupe longitudinale du réservoir, les côtés représentés sont rectilignes sur leur face externe et sont reliés par un arrondi ou congé 12. La face externe est constituée par une peau 2 mince d' épaisseur constante sous forme de matériau compact. La face externe entoure une âme 3 épaisse en matériau creux sous forme alvéolée ou de mousse. L'épaisseur de l'âme 3 est variable. L'épaisseur de l'âme 3 est plus grande à l'intersection des diagonales de chaque face du parallélépipède et décroît au voisinage des arêtes du parallélépipède pour atteindre une épaisseur faible. L'épaisseur ne varie pas linéairement, mais de façon curviligne, ici en arc de cercle. Les côtés de la peau interne 4 représentée sont reliés par un arrondi ou congé 13. Ainsi selon une caractéristique de l'invention, l'épaisseur de l'âme 3 d'une face peut décroître au voisinage d'une arête jusqu'à une valeur minimale, puis croître au niveau du congé. Au niveau de la face contigϋe, l'épaisseur de l'âme en prolongement peut éventuellement décroître au voisinage de l'arête puis recroître à nouveau pour devenir maximale au niveau de sa partie médiane. Dans ce cas, l'épaisseur de la paroi au droit de l'arête peut être sensiblement égale à l'épaisseur maximale de l'âme 3.A preferred embodiment of the parallelepiped tank according to the invention is shown in Figure 4. It consists of a parallelepiped whose edges have rounded or leave 12. Each wall is thick and has several layers. In the longitudinal section view of the reservoir, the sides shown are rectilinear on their external face and are connected by a rounded or fillet 12. The external face consists of a thin skin 2 of constant thickness in the form of compact material. The external face surrounds a thick core 3 of hollow material in the honeycomb or foam form. The thickness of the core 3 is variable. The thickness of the core 3 is greater at the intersection of the diagonals of each face of the parallelepiped and decreases in the vicinity of the edges of the parallelepiped to reach a small thickness. The thickness does not vary linearly, but curvilinearly, here in an arc. The sides of the internal skin 4 shown are connected by a rounded or fillet 13. Thus according to a characteristic of the invention, the thickness of the core 3 of a face can decrease in the vicinity of an edge to a minimum value, then grow at the leave level. At the level of the contiguous face, the thickness of the core in extension may possibly decrease in the vicinity of the edge then decrease again to become maximum at its median part. In this case, the thickness of the wall in line with the edge may be substantially equal to the maximum thickness of the core 3.
La figure 5 montre l'âme 3 à l'emplacement des congés 12, 13 à l'intersection de deux parois contiguës du réservoir. Afin d'optimiser la tenue mécanique du réservoir, l'âme 3 n'est pas constituée uniformément d'un même matériau ayant les mêmes caractéristiques mécaniques. Dans l'exemple de réalisation pris en considération, l'âme 3 est constituée d'une mousse polymère dont deux parois A et C contiguës sont raccordées par un élément de paroi B. 8FIG. 5 shows the core 3 at the location of the leaves 12, 13 at the intersection of two contiguous walls of the reservoir. In order to optimize the mechanical strength of the reservoir, the core 3 is not made up uniformly of the same material having the same mechanical characteristics. In the embodiment taken into consideration, the core 3 consists of a polymer foam, two adjoining walls A and C of which are connected by a wall element B. 8
La densité de la mousse et ses caractéristiques mécaniques sont différentes selon la taille de la face considérée du réservoir et selon la partie de l'âme comme les faces du réservoir ou les congés. Selon une caractéristique de l'invention, chaque portion A, B, C de l'âme 3 est délimitée par les surfaces interne et externe de l'âme et un plan reliant les droites situées à l'intersection des surfaces interne et externe des faces du réservoir et des congés 12, 13. En variante, l'épaisseur de la portion B peut être plus importante au droit de l'intersection des deux parois adjacentes et décroître de part et d'autre au niveau de la portion A ou C, puis recroître et devenir maximale dans leur partie centrale.The density of the foam and its mechanical characteristics are different according to the size of the face considered of the reservoir and according to the part of the core such as the faces of the reservoir or the leaves. According to a characteristic of the invention, each portion A, B, C of the core 3 is delimited by the internal and external surfaces of the core and a plane connecting the lines located at the intersection of the internal and external surfaces of the faces of the reservoir and of the leaves 12, 13. As a variant, the thickness of the portion B may be greater at the intersection of the two adjacent walls and decrease on both sides at the level of the portion A or C, then increase and become maximum in their central part.
Des caractéristiques physiques et mécaniques des trois portions A, B, C de l'âme ont été testées sous une pression interne de 30.105 Pa à 20°C pour un réservoir parallélépipédique comportant les dimensions suivantes : longueur 1 largeur Hauteur hPhysical and mechanical characteristics of the three portions A, B, C of the core were tested under an internal pressure of 30.10 5 Pa at 20 ° C for a parallelepipedic tank comprising the following dimensions: length 1 width Height h
Dimension (mm) 850 434 330Dimension (mm) 850 434 330
Les valeurs des caractéristiques physiques et mécaniques déterminées pour les portions A, B, C sont indiquées dans le tableau qui suit :The values of the physical and mechanical characteristics determined for the portions A, B, C are indicated in the table below:
portion A portion B Portion Cportion A portion B Portion C
Module de Young 25 286 204 (MPa)Young's module 25 286 204 (MPa)
Coefficient de 0 0,24 0,2 PoissonCoefficient of 0 0.24 0.2 Fish
Masse volumique 0,045 0,26 0,2 (Kg/dm2) Density 0.045 0.26 0.2 (Kg / dm 2 )
Les portions correspondant aux cotés de plus grande surface sont plus denses et ont des caractéristiques mécaniques plus élevées que celles correspondant aux côtés de plus faible surface. Les angles du réservoir sont denses et ont des caractéristiques mécaniques élevées.The portions corresponding to the sides of larger surface are denser and have higher mechanical characteristics than those corresponding to the sides smaller area. The tank angles are dense and have high mechanical characteristics.
En relation avec la figure 6 et selon les modes de réalisation représentés aux figures 3 et 4, les dimensions de l'âme des parois à l'emplacement des congés à l'intersection de deux faces d'un réservoir parallélépipédique sont définies dans le tableau suivant (les cotes hc et lc permettent de construire la courbure en arc de cercle des modes de réalisations représentés aux figures 3 et 4 :In relation to FIG. 6 and according to the embodiments represented in FIGS. 3 and 4, the dimensions of the core of the walls at the location of the leaves at the intersection of two faces of a parallelepiped tank are defined in the table following (the dimensions h c and l c make it possible to construct the curvature in an arc of a circle of the embodiments represented in FIGS. 3 and 4:
lt/2 ht/2 e i le le hc e dimension (mm) 217 165 75 35 20 40 30 55 lt / 2 h t / 2 e i le le h this dimension (mm) 217 165 75 35 20 40 30 55
La masse d'un tel réservoir est de l'ordre de 36 kg pour un volume utile de 70 litres. On a constaté que la contrainte maximale est toujours située au niveau de la peau interne du congé intérieur et atteint une valeur élevée. Au niveau de la peau externe, la contrainte maximale atteint une valeur beaucoup plus faible.The mass of such a tank is of the order of 36 kg for a useful volume of 70 liters. It has been found that the maximum stress is always located at the level of the internal skin of the internal leave and reaches a high value. At the level of the external skin, the maximum stress reaches a much lower value.
La figure 7 montre une variante de réalisation d'un réservoir 1 objet de l'invention, dont la forme n'est pas strictement parallélépipédique, mais de forme polyédrique, afin de pouvoir se loger dans un compartiment du véhicule de forme irrégulière. Quelle que soit la géométrie du réservoir 1, sa structure reste la même : comme dans le cas d'un réservoir parallélépipédique, les arêtes du polyèdre comportent des congés 12. Le réservoir est composé d'une peau externe 2 et interne 4 en matériau compact prenant en sandwich une âme 3 en matériau poreux ou alvéolé. De même, l'épaisseur de l'âme 3 n'est pas constante. Dans le cas d'une forme polyédrique complexe, l'épaisseur de l'âme 3 n'est pas nécessairement minimale au niveau des congés 12, 13 et ni nécessairement maximale aux alentours de l'intersection des diagonales de chaque face du polyèdre. 10FIG. 7 shows an alternative embodiment of a tank 1 which is the subject of the invention, the shape of which is not strictly parallelepipedal, but of polyhedral shape, in order to be able to be housed in a compartment of the vehicle of irregular shape. Whatever the geometry of the reservoir 1, its structure remains the same: as in the case of a parallelepipedic reservoir, the edges of the polyhedron have fillets 12. The reservoir is composed of an external skin 2 and internal skin 4 of compact material sandwiching a core 3 of porous or cellular material. Likewise, the thickness of the core 3 is not constant. In the case of a complex polyhedral shape, the thickness of the core 3 is not necessarily minimum at the level of the leaves 12, 13 and nor necessarily maximum around the intersection of the diagonals of each face of the polyhedron. 10
Le réservoir 1 polyédrique représenté peut être en plusieurs volumes de forme géométrique distincte : un premier volume X parallélépipédique sur un côté duquel vient se greffer un deuxième volume prismatique Y et un troisième volume parallélépipédique Z. Sur la figure, on a encore représenté une variante selon laquelle le deuxième volume Y peut être muni d'un renfort 14 et le troisième volume Z d'un autre renfort 15, ces deux renforts étant disposés transversalement pour réunir deux parois latérales opposées. Ces renforts 14 et 15 constituent des raidisseurs internes pour renforcer les zones où régnent des contraintes plus fortes comme par exemple au niveau des zones Y et Z. Bien entendu, ces renforts 14 et 15 sont ajourés sans angle vif pour assurer la communication entre les différents compartiments délimités par ces renforts.The polyhedral reservoir 1 represented can be in several volumes of distinct geometrical shape: a first parallelepipedic volume X on one side of which is grafted a second prismatic volume Y and a third parallelepipedic volume Z. In the figure, a variant has also been represented according to which the second volume Y can be provided with a reinforcement 14 and the third volume Z with another reinforcement 15, these two reinforcements being arranged transversely to join two opposite side walls. These reinforcements 14 and 15 constitute internal stiffeners to reinforce the zones where higher stresses prevail, for example at the level of zones Y and Z. Of course, these reinforcements 14 and 15 are perforated without sharp angles to ensure communication between the different compartments delimited by these reinforcements.
Les modes de réalisation du réservoir selon l'invention décrits précédemment et représentés sur les figures sont nullement limitatifs et peuvent donner lieu à des variantes. A titre de variante, les peaux internes et externes peuvent par exemple ne pas être d'épaisseur constante. The embodiments of the tank according to the invention described above and shown in the figures are in no way limiting and may give rise to variants. As a variant, the internal and external skins may for example not be of constant thickness.

Claims

1111
REVENDICATIONS
1 - Réservoir (1) destiné à contenir un fluide sous pression, caractérisé en ce qu'il présente une forme extérieure polyédrique dont les parois des faces constituent une structure sandwich lui conférant une résistance multidirectionnelle à la pression.1 - Reservoir (1) intended to contain a fluid under pressure, characterized in that it has a polyhedral exterior shape, the walls of the faces of which constitute a sandwich structure giving it multidirectional resistance to pressure.
2 - Réservoir selon la revendication 1, caractérisé en ce que la structure sandwich des parois est constituée d'une part par une peau externe (2) et une peau interne (4) en matériau compact et d'autre part par une âme (3) en matériau poreux ou alvéolé, ladite âme (3) étant entourée sur sa face externe par ladite peau externe (2) et sur sa face interne par ladite peau interne (4) .2 - Tank according to claim 1, characterized in that the sandwich structure of the walls consists firstly of an external skin (2) and an internal skin (4) of compact material and secondly by a core (3 ) made of porous or cellular material, said core (3) being surrounded on its outer face by said outer skin (2) and on its inner face by said inner skin (4).
3 - Réservoir selon la revendication 2, caractérisé en ce que l'âme (3) de la structure sandwich des parois est en matériau de type nid d'abeille ou mousse.3 - Tank according to claim 2, characterized in that the core (3) of the sandwich structure of the walls is of material of the honeycomb or foam type.
4 - Réservoir selon la revendication 3, caractérisé en ce que l'épaisseur de chacune des parois du polyèdre est variable. 5 - Réservoir selon la revendication 4, caractérisé en ce que l'épaisseur de chacune des parois du polyèdre est réduite au voisinage des angles du réservoir et est importante au niveau de leur partie médiane.4 - Tank according to claim 3, characterized in that the thickness of each of the walls of the polyhedron is variable. 5 - Reservoir according to claim 4, characterized in that the thickness of each of the walls of the polyhedron is reduced in the vicinity of the corners of the reservoir and is significant at their median part.
6 - Réservoir selon la revendication 5, caractérisé en ce que au moins une de ses parois présente une forme curviligne en contact avec le fluide sous pression.6 - Tank according to claim 5, characterized in that at least one of its walls has a curvilinear shape in contact with the pressurized fluid.
7 - Réservoir selon la revendication 5, caractérisé en ce que sur au moins une de ses parois présente une forme paraboloidale en contact avec le fluide sous pression. 8 - Réservoir selon la revendication 5, caractérisé en ce que sur au moins une des ses parois présente une forme ellipsoïdale en contact avec le fluide sous pression. 127 - Tank according to claim 5, characterized in that on at least one of its walls has a paraboloidal shape in contact with the pressurized fluid. 8 - Tank according to claim 5, characterized in that on at least one of its walls has an ellipsoidal shape in contact with the pressurized fluid. 12
9 - Réservoir selon l'une des revendications 5 à 8, caractérisée en ce que ses parois comportent entre elles des raccordements arrondis ou congés (12) .9 - Reservoir according to one of claims 5 to 8, characterized in that its walls have between them rounded or leave connections (12).
10 - Réservoir selon la revendication 9, caractérisé en ce que les parois contiguës sont raccordées par un élément B de paroi présentant une résistance et une densité plus grande .10 - Tank according to claim 9, characterized in that the adjoining walls are connected by a wall element B having a greater resistance and density.
11 - Réservoir selon l'une quelconque des revendications précédentes, caractérisé en ce que le réservoir (1) est de forme extérieure parallélépipédique. 11 - Reservoir according to any one of the preceding claims, characterized in that the reservoir (1) is of parallelepiped external shape.
EP99910427A 1998-03-26 1999-03-25 Polyhedral tank designed for containing fluids under pressure Withdrawn EP1068470A1 (en)

Applications Claiming Priority (3)

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FR9803719 1998-03-26
FR9803719A FR2776750B1 (en) 1998-03-26 1998-03-26 POLYEDRIC TANK FOR CONTAINING PRESSURE FLUIDS
PCT/FR1999/000694 WO1999049262A1 (en) 1998-03-26 1999-03-25 Polyhedral tank designed for containing fluids under pressure

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