EP1279884A1 - Device for the insulation of the bottom of a reservoir - Google Patents

Device for the insulation of the bottom of a reservoir Download PDF

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Publication number
EP1279884A1
EP1279884A1 EP02291884A EP02291884A EP1279884A1 EP 1279884 A1 EP1279884 A1 EP 1279884A1 EP 02291884 A EP02291884 A EP 02291884A EP 02291884 A EP02291884 A EP 02291884A EP 1279884 A1 EP1279884 A1 EP 1279884A1
Authority
EP
European Patent Office
Prior art keywords
fabric
felt
cryogenic
spherical cap
tank
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Withdrawn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
EP02291884A
Other languages
German (de)
French (fr)
Inventor
Alain Borromée
Rémo Cargnello
Arnaud Duval
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.)
Euro Cryospace France GIE
Original Assignee
Cryospace LAir Liquide Aerospatiale GIE
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 Cryospace LAir Liquide Aerospatiale GIE filed Critical Cryospace LAir Liquide Aerospatiale GIE
Publication of EP1279884A1 publication Critical patent/EP1279884A1/en
Withdrawn legal-status Critical Current

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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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/001—Thermal insulation specially adapted for cryogenic vessels
    • 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
    • F17C1/12—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge with provision for thermal insulation
    • 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
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls

Definitions

  • the present invention relates to a tank bottom isolation device, for example cryogenic.
  • the field of the invention is that of tank bottom insulation devices, consisting of a felt and fabric mattress, used against convection and radiation heat exchange, to ensure, for example, thermal insulation cryogenic tanks used in aeronautics and space.
  • the insulation of a bottom of the cryogenic tank 10, including the inspection door may consist of a mattress formed of one or more layers of felt 14, covered with 'a layer (“liner") aluminized 15. This mattress is held, in general, by fixing pins 18 bonded to the bottom of the tank.
  • Figure 1A illustrates, thus, a bottom view
  • Figure 1B illustrates a sectional view along section AA shown in Figure 1A
  • Figure 1C illustrates a detail view of such a device for isolating the known art positioned on a cryogenic tank bottom.
  • the bottom of the reservoir 10 has a spherical bottom cap 11, and is provided with a inspection door 12.
  • Sectors 13 of a mattress, formed of a layer of felt 14, for example of dacron, and of an aluminized layer 15, are arranged on this tank bottom.
  • These sectors 13 are fixed to said bottom by means of fixing pins 18 glued to it and by smooth rod fasteners 19, and are interconnected by welded joints 20.
  • Such a device of the known art makes it possible to control the thickness of the mattress ensuring thermal insulation. But it is a complex and costly implementation: The assembly of such a device requires a lot of integration time and thereby generates production cycles which can be long. In addition, it cannot be integrated on the bottom of a tank in a single operation.
  • the object of the invention is to overcome these drawbacks by proposing a device for thermal insulation of the tank bottom, for example cryogenic, which does not have recourse to bonding or tightening, and which allows mass production at a reasonable industrial cost.
  • the present invention relates to a tank bottom isolation device, for example cryogenic, comprising a padded assembly formed by at least one layer of felt and a cryogenic fabric so as to form an insulating gas blanket on the surface of said tank bottom, characterized in that it comprises a frame for fixing said assembly to the bottom of the tank.
  • the padded assembly has the shape of a spherical cap.
  • the fabric comprises several pieces in the form of circular sectors joined together by one of their spokes to form a spherical cap.
  • the layers of felt are fixed to said spherical cap by means of self-gripping bands.
  • Said spherical cap comprises at least one pass disposed along each of the radii of the circular sectors.
  • a central part is fixed on said spherical cap.
  • the frame comprises flexible linear elements, for example glass-epoxy resin composite tubes, each arranged in at least one pass and fixed, at one of their ends, to the central part.
  • all of the felt layers have a thickness of between 20 mm and 100 mm.
  • the felt comprises a polyester with helical crimp and a binder vinyl acetate copolymer added in the proportion of about 20%.
  • the cryogenic fabric is a double-sided aluminized glass fabric. This aluminized fabric has a flammability classification of M1, a surface mass of less than 250 grams per square meter and a tensile breaking stress at 77 K greater than 100 MPa in the warp-weft direction.
  • the invention thus provides an insulation device consisting of a padded assembly limiting the thermal exchanges of convection and radiation, the original design of which allows it to be integrated in a single operation on the concave or convex bottom of a tank likely to be at cryogenic temperature.
  • the originality of such a device lies in its fixing, which eliminates all the operations of surface treatment, projection of bonding primer and fixing of the pins by bonding, and in its form, which, in the presence of cables electrical, authorizes the routing of these and removes all fastening systems, bonding or tightening, on the bottom of the tank.
  • the device of the invention takes its shape without constraining parts which can be stressed by the deformation of the structure.
  • the creation of passers-by allowing the passage of the composite tubes, allows the routing of the electrical cables previously fixed on the tank.
  • the wiring can be integrated before the installation of the device. All the forces are distributed along the insulation and the problems of resistance at low temperature of the electric cables are nonexistent; these no longer being in contact with the wall of the tank.
  • the disassembly of this device is very rapid, and does not cause any degradation of the felt forming the insulating blanket, since it is not fixed to the bottom of the tank.
  • the device can be folded for storage and transport. The design of this device allows several assemblies and disassemblies without degradation of it, or of the structure to be protected, equipped with its wiring.
  • the device of the invention can advantageously be integrated into the lower bottom of the cryogenic upper stage of the Ariane 5 launcher, when the latter is in the launch zone (French Guiana).
  • FIG. 1A illustrates a view from below
  • FIG. 1B illustrates a sectional view along the section AA represented in FIG. 1A
  • FIG. 1C illustrates a detailed view of an isolation device of the known art positioned on a cryogenic tank bottom.
  • Figure 2 is a general view of the device of the invention mounted on an example of the tank bottom.
  • FIG. 3 is a detailed view, along arrow F, of the principle of attachment of the device of the invention as shown in FIG. 2.
  • FIG. 4 is a sectional view B-B of the device of the invention illustrated in FIG. 3.
  • the isolation device of the invention 30 is arranged, for example, on the convex bottom 31 of an H 2 tank 32 of the Ariane launcher 5.
  • the inspection hatch 33 In this figure is shown the inspection hatch 33 .
  • the device of the invention comprises a padded assembly, in the form of a spherical cap, comprising a cryogenic fabric 35 and at least one layer of felt 36 making it possible to form an insulating gas blanket at the surface of the tank bottom 31 and a frame 37 for fixing said assembly to said bottom, the tank wall being referenced 38.
  • the fabric 35 comprises several pieces in the form of circular sectors 40 assembled together, by sewing or by gluing, by a of their rays 41 to form a spherical cap.
  • the felt layer (s) 36 is (are) fixed to said cap by means of hook-and-loop strips, for example of the hook or astrakhan type.
  • the fabric comprises at least one pass 42 disposed along each radius 41 of the sectors 40.
  • a central part 43 is fixed thereon.
  • the frame 37 comprises flexible linear elements, for example tubes each arranged in at least one pass 42 and fixed to the central part 43 by interlocking.
  • the device of the invention thus comprises a cryogenic fabric cut into sectors and then assembled, by sewing or by gluing, in one piece. Along each sector assembly at least one pass 42 is made so as to allow the introduction of the tubes. At the center of the spherical cap formed by said device, the central part 43, fixed on said glass fabric, is used for fixing said tubes. Velcro strips hold the felt on the fabric.
  • the device of the invention can then be fixed to the tank in a single mounting operation, the central part 43 coming to be pressed against the bottom of the tank.
  • the device of the invention thus combines the principle of an "umbrella" of low thermal emissivity, studied so as to match the bottom of a cryogenic tank at a sufficient distance to form with the felt mattress an insulating gas mattress, with that of mounting systems such as "igloo tents". Is thus obtained, by mechanical fixing and bending of composite tubes, an insulation whose reinforcement is fixed without constraint and fits perfectly on the bottom of a tank, when cold and pressure thereof.
  • the cryogenic fabric is a double-sided aluminized glass fabric, of flammability classification M1, having a surface mass of less than 250 grams per square meter and a tensile breaking stress at 77 K greater than 100 MPa, in the warp and weft direction.
  • the felt with a thickness of 20 to 100 mm is preferably a polyester with a helical crimp
  • the binder is a vinyl acetate copolymer, added in the proportion of 20%.
  • the central part 43 makes it possible to fix the composite tubes at a distance of approximately 60 mm from the center of the spherical cap.
  • the central part 43 and the tubes of the frame are made of composite, fiberglass, very light or aluminum.

Abstract

An insulator for applications such as the base of a cryogenic reservoir, consists of a padded assembly made up of at least one layer of felt (36) and a cryo-technical fabric (35) in a spherical dome shape, fixed to the base of the reservoir by a reinforcing system (37). An insulator for applications such as the base of a cryogenic reservoir, consists of a padded assembly made up of at least one layer of felt (36) and a cryo-technical fabric (35) in a spherical dome shape, fixed to the base of the reservoir by a reinforcing system (37). The fabric is in the form of a series of sectors joined by their radii to form a dome, and the layers of felt are joined to the dome by self-adhesive strips. The reinforcing system is made up of a series of flexible linear elements passed through loops on the fabric sectors and joined to a central element (43). The cryo-technical fabric has an M1 inflammability rating with a surface mass of under 250 g/sq m and a resistance to rupture with a traction of 77 K higher than 100 MPa in the weft direction.

Description

Domaine techniqueTechnical area

La présente invention concerne un dispositif d'isolation de fond de réservoir, par exemple cryogénique.The present invention relates to a tank bottom isolation device, for example cryogenic.

Etat de la technique antérieureState of the prior art

Le domaine de l'invention est celui des dispositifs d'isolation de fond de réservoir, constitués d'un matelas de feutre et de tissu, utilisés contre les échanges thermiques de convection et de rayonnement, pour assurer, par exemple, l'isolation thermique de réservoirs cryogéniques utilisés dans le domaine aéronautique et spatial.The field of the invention is that of tank bottom insulation devices, consisting of a felt and fabric mattress, used against convection and radiation heat exchange, to ensure, for example, thermal insulation cryogenic tanks used in aeronautics and space.

De manière connue, comme illustré à la figure 1, l'isolation d'un fond de réservoir cryogénique 10, y compris la porte de visite, peut être constituée d'un matelas formé d'une ou plusieurs couches de feutre 14, recouvertes d'une couche ("liner") aluminisée 15. Ce matelas est maintenu, en général, par des pions de fixation 18 collés sur le fond du réservoir.In known manner, as illustrated in FIG. 1, the insulation of a bottom of the cryogenic tank 10, including the inspection door, may consist of a mattress formed of one or more layers of felt 14, covered with 'a layer ("liner") aluminized 15. This mattress is held, in general, by fixing pins 18 bonded to the bottom of the tank.

La figure 1A illustre, ainsi, une vue de dessous, la figure 1B illustre une vue en coupe selon la coupe AA représentée sur la figure 1A, et la figure 1C illustre une vue de détail d'un tel dispositif d'isolation de l'art connu positionné sur un fond de réservoir cryogénique. Le fond du réservoir 10 comporte une calotte sphérique de fond 11, et est muni d'une porte de visite 12. Des secteurs 13 d'un matelas, formé d'une couche de feutre 14, par exemple de dacron, et d'une couche aluminisée 15, sont disposés sur ce fond de réservoir. Ces secteurs 13 sont fixés sur ledit fond au moyen des pions de fixation 18 collés sur celui-ci et de fixations de tige lisse 19, et sont reliés entre eux par des joints soudés 20.Figure 1A illustrates, thus, a bottom view, Figure 1B illustrates a sectional view along section AA shown in Figure 1A, and Figure 1C illustrates a detail view of such a device for isolating the known art positioned on a cryogenic tank bottom. The bottom of the reservoir 10 has a spherical bottom cap 11, and is provided with a inspection door 12. Sectors 13 of a mattress, formed of a layer of felt 14, for example of dacron, and of an aluminized layer 15, are arranged on this tank bottom. These sectors 13 are fixed to said bottom by means of fixing pins 18 glued to it and by smooth rod fasteners 19, and are interconnected by welded joints 20.

Un tel dispositif de l'art connu permet de maîtriser l'épaisseur du matelas assurant l'isolation thermique. Mais il est d'une mise en oeuvre complexe et coûteuse : Le montage d'un tel dispositif demande beaucoup de temps d'intégration et engendre de ce fait des cycles de production qui peuvent être longs. De plus, il ne peut pas être intégré sur le fond d'un réservoir en une seule opération.Such a device of the known art makes it possible to control the thickness of the mattress ensuring thermal insulation. But it is a complex and costly implementation: The assembly of such a device requires a lot of integration time and thereby generates production cycles which can be long. In addition, it cannot be integrated on the bottom of a tank in a single operation.

Plus précisément les inconvénients des dispositifs d'isolation de ce type sont les suivants :

  • un traitement de surface du fond de réservoir 10 est nécessaire afin de coller les pions de fixations 18,
  • le temps entre le traitement de surface et le collage des pions de fixation 18 étant court, l'application d'un primaire de collage sur le fond de réservoir 10 est indispensable, ce qui conduit à des manutentions du réservoir dans une salle de projection prévue à cet effet,
  • le collage des pions de fixation 18 est une opération de production difficile à réaliser à cause de leur quantité et de leur maintien en pression sur le fond du réservoir 10 pendant toute la phase de polymérisation de la colle,
  • chaque dispositif d'isolation est intégré par secteurs et fixé en de multiples endroits du fond de réservoir 10,
  • les câbles électriques, qui cheminent sous le dispositif, doivent être fixés au préalable sur ledit fond, ce qui nécessite des opérations d'intégration et de définition spécifiques à leur maintien,
  • certains pions de fixation 18 risquent de se décoller à cause de la combinaison de mise en froid et de mise en pression du réservoir ; des contrôles systématiques sont donc nécessaires,
  • un tel dispositif d'isolation ne peut pas être conçu en un seul élément, et ne se monte donc pas en une seule opération d'intégration sur un fond de réservoir,
  • la pose d'un tel dispositif d'isolation s'effectue à un stade de production bien défini dans le cycle d'intégration, et de ce fait, ne peut pas, dans le cas d'isolation d'un réservoir cryogénique de lanceur, se monter en zone de lancement en cas de défaut d'approvisionnement,
  • l'utilisation de produits de collage nécessite un suivi de ces produits soumis à péremption.
More specifically, the drawbacks of insulation devices of this type are as follows:
  • a surface treatment of the tank bottom 10 is necessary in order to bond the fixing pins 18,
  • the time between the surface treatment and the bonding of the fixing pins 18 being short, the application of a bonding primer on the tank bottom 10 is essential, which leads to handling of the tank in a planned projection room for this purpose,
  • the bonding of the fixing pins 18 is a production operation difficult to carry out because of their quantity and of their pressure maintenance on the bottom of the reservoir 10 during the entire adhesive polymerization phase,
  • each insulation device is integrated by sectors and fixed at multiple locations on the tank bottom 10,
  • the electric cables, which run under the device, must be fixed beforehand on said bottom, which requires integration and definition operations specific to their maintenance,
  • some fixing pins 18 may come off due to the combination of cooling and pressurizing the tank; systematic checks are therefore necessary,
  • such an isolation device cannot be designed as a single element, and therefore cannot be assembled in a single integration operation on a tank bottom,
  • the installation of such an isolation device takes place at a well-defined production stage in the integration cycle, and therefore cannot, in the case of isolation of a cryogenic launcher tank, set up in the launch zone in case of lack of supply,
  • the use of bonding products requires monitoring of these expired products.

L'objet de l'invention est de pallier ces inconvénients en proposant un dispositif d'isolation thermique de fond de réservoir, par exemple cryogénique, qui n'aie pas recours à des techniques de collage ou de serrage, et qui permette une production en série à un coût industriel raisonnable.The object of the invention is to overcome these drawbacks by proposing a device for thermal insulation of the tank bottom, for example cryogenic, which does not have recourse to bonding or tightening, and which allows mass production at a reasonable industrial cost.

Exposé de l'inventionStatement of the invention

La présente invention concerne un dispositif d'isolation de fond de réservoir, par exemple cryogénique, comprenant un ensemble matelassé formé d'au moins une couche de feutre et d'un tissu cryotechnique de manière à former un matelas de gaz isolant à la surface dudit fond de réservoir, caractérisé en ce qu'il comprend une armature de fixation dudit ensemble sur le fond du réservoir.The present invention relates to a tank bottom isolation device, for example cryogenic, comprising a padded assembly formed by at least one layer of felt and a cryogenic fabric so as to form an insulating gas blanket on the surface of said tank bottom, characterized in that it comprises a frame for fixing said assembly to the bottom of the tank.

Avantageusement l'ensemble matelassé a la forme d'une calotte sphérique. Le tissu comprend plusieurs morceaux en forme de secteurs circulaires assemblés entre eux par un de leurs rayons pour former une calotte sphérique. Les couches de feutre sont fixées à ladite calotte sphérique au moyen de bandes auto-agrippantes. Ladite calotte sphérique comprend au moins un passant disposé le long de chacun des rayons des secteurs circulaires. Une pièce centrale est fixée sur ladite calotte sphérique. L'armature comprend des éléments linéaires flexibles, par exemple des tubes en composite verre-résine époxyde, disposés chacun dans au moins un passant et fixés, en une de leurs extrémités, à la pièce centrale.Advantageously, the padded assembly has the shape of a spherical cap. The fabric comprises several pieces in the form of circular sectors joined together by one of their spokes to form a spherical cap. The layers of felt are fixed to said spherical cap by means of self-gripping bands. Said spherical cap comprises at least one pass disposed along each of the radii of the circular sectors. A central part is fixed on said spherical cap. The frame comprises flexible linear elements, for example glass-epoxy resin composite tubes, each arranged in at least one pass and fixed, at one of their ends, to the central part.

Avantageusement l'ensemble des couches en feutre a une épaisseur comprise entre 20 mm et 100 mm.Advantageously, all of the felt layers have a thickness of between 20 mm and 100 mm.

Dans un exemple de réalisation le feutre comprend un polyester à frisure hélicoïdale et un liant en copolymère d'acétate de vinyle ajouté dans la proportion d'environ 20%. Le tissu cryotechnique est un tissu de verre aluminisé double face. Ce tissu aluminisé est de classification d'inflammabilité M1, de masse surfacique inférieure à 250 grammes au mètre carré et de contrainte à rupture en traction à 77 K supérieure à 100 MPa dans le sens chaîne-trame.In an exemplary embodiment the felt comprises a polyester with helical crimp and a binder vinyl acetate copolymer added in the proportion of about 20%. The cryogenic fabric is a double-sided aluminized glass fabric. This aluminized fabric has a flammability classification of M1, a surface mass of less than 250 grams per square meter and a tensile breaking stress at 77 K greater than 100 MPa in the warp-weft direction.

L'invention propose, ainsi, un dispositif d'isolation constitué d'un ensemble matelassé limitant les échanges thermiques de convection et de rayonnement dont la conception originale lui permet d'être intégré en une seule opération sur le fond concave ou convexe d'un réservoir susceptible de se trouver à une température cryogénique.The invention thus provides an insulation device consisting of a padded assembly limiting the thermal exchanges of convection and radiation, the original design of which allows it to be integrated in a single operation on the concave or convex bottom of a tank likely to be at cryogenic temperature.

L'originalité d'un tel dispositif réside dans sa fixation, qui supprime toutes les opérations de traitement de surface, de projection de primaire de collage et de fixation des pions par collage, et dans sa forme, qui, en cas de présence de câbles électriques, autorise le cheminement de ceux-ci et supprime tous systèmes de fixations, collages ou serrages, sur le fond du réservoir.The originality of such a device lies in its fixing, which eliminates all the operations of surface treatment, projection of bonding primer and fixing of the pins by bonding, and in its form, which, in the presence of cables electrical, authorizes the routing of these and removes all fastening systems, bonding or tightening, on the bottom of the tank.

Lors des mises en froid et en pression du réservoir, le dispositif de l'invention prend sa forme sans contraindre des pièces pouvant être sollicitées par la déformation de la structure. La réalisation de passants permettant le passage des tubes en composite, autorise le cheminement des câblages électriques jusqu'alors fixés sur le réservoir. Le câblage peut être intégré avant la mise en place du dispositif. Tous les efforts sont répartis le long de l'isolation et les problèmes de tenue en basse température des câbles électriques sont inexistants ; ceux-ci n'étant plus en contact avec la paroi du réservoir. Le démontage de ce dispositif est très rapide, et n'entraîne aucune dégradation du feutre formant le matelas isolant, étant donné qu'il n'est pas fixé sur le fond du réservoir. Le dispositif peut être plié pour son stockage et son transport. La conception de ce dispositif autorise plusieurs montages et démontages sans dégradation de celui-ci, ni de la structure à protéger, équipée de son câblage.When the tank is cooled and under pressure, the device of the invention takes its shape without constraining parts which can be stressed by the deformation of the structure. The creation of passers-by allowing the passage of the composite tubes, allows the routing of the electrical cables previously fixed on the tank. The wiring can be integrated before the installation of the device. All the forces are distributed along the insulation and the problems of resistance at low temperature of the electric cables are nonexistent; these no longer being in contact with the wall of the tank. The disassembly of this device is very rapid, and does not cause any degradation of the felt forming the insulating blanket, since it is not fixed to the bottom of the tank. The device can be folded for storage and transport. The design of this device allows several assemblies and disassemblies without degradation of it, or of the structure to be protected, equipped with its wiring.

Dans un exemple de mise en oeuvre le dispositif de l'invention peut avantageusement être intégré au fond inférieur de l'étage supérieur cryogénique du lanceur Ariane 5, quand celui-ci est en zone de lancement (Guyane française).In an exemplary implementation, the device of the invention can advantageously be integrated into the lower bottom of the cryogenic upper stage of the Ariane 5 launcher, when the latter is in the launch zone (French Guiana).

Brève description des dessinsBrief description of the drawings

La figure 1A illustre une vue de dessous, la figure 1B illustre une vue en coupe selon la coupe AA représentée sur la figure 1A, et la figure 1C illustre une vue de détail d'un dispositif d'isolation de l'art connu positionné sur un fond de réservoir cryogénique.FIG. 1A illustrates a view from below, FIG. 1B illustrates a sectional view along the section AA represented in FIG. 1A, and FIG. 1C illustrates a detailed view of an isolation device of the known art positioned on a cryogenic tank bottom.

La figure 2 est une vue générale du dispositif de l'invention monté sur un exemple de fond de réservoir.Figure 2 is a general view of the device of the invention mounted on an example of the tank bottom.

La figure 3 est une vue détaillée, selon la flèche F, du principe de fixation du dispositif de l'invention tel que représenté sur la figure 2.FIG. 3 is a detailed view, along arrow F, of the principle of attachment of the device of the invention as shown in FIG. 2.

La figure 4 est une vue en coupe B-B du dispositif de l'invention illustré sur la figure 3.FIG. 4 is a sectional view B-B of the device of the invention illustrated in FIG. 3.

Exposé détaillé de l'inventionDetailed description of the invention

Sur la figure 2 le dispositif d'isolation de l'invention 30 est disposé, à titre d'exemple, sur le fond convexe 31 d'un réservoir H2 32 du lanceur Ariane 5. Sur cette figure est représenté la trappe de visite 33.In Figure 2 the isolation device of the invention 30 is arranged, for example, on the convex bottom 31 of an H 2 tank 32 of the Ariane launcher 5. In this figure is shown the inspection hatch 33 .

Comme illustré sur les figures 2, 3 et 4 le dispositif de l'invention comprend un ensemble matelassé, en forme de calotte sphérique, comprenant un tissu cryotechnique 35 et au moins une couche de feutre 36 permettant de former un matelas de gaz isolant à la surface du fond de réservoir 31 et une armature 37 de fixation dudit ensemble sur ledit fond, la paroi du réservoir étant référencée 38. Le tissu 35 comprend plusieurs morceaux en forme de secteurs circulaires 40 assemblés entre eux, par couture ou par collage, par un de leurs rayons 41 pour former une calotte sphérique. La (ou les) couche(s) de feutre 36 est (sont) fixée(s) à ladite calotte au moyen de bandes autoagrippantes, par exemple de type crochet ou astrakan.As illustrated in FIGS. 2, 3 and 4, the device of the invention comprises a padded assembly, in the form of a spherical cap, comprising a cryogenic fabric 35 and at least one layer of felt 36 making it possible to form an insulating gas blanket at the surface of the tank bottom 31 and a frame 37 for fixing said assembly to said bottom, the tank wall being referenced 38. The fabric 35 comprises several pieces in the form of circular sectors 40 assembled together, by sewing or by gluing, by a of their rays 41 to form a spherical cap. The felt layer (s) 36 is (are) fixed to said cap by means of hook-and-loop strips, for example of the hook or astrakhan type.

Le tissu comprend au moins un passant 42 disposé le long de chaque rayon 41 des secteurs 40. Une pièce centrale 43 est fixée sur celui-ci. L'armature 37 comprend des éléments linéaires flexibles, par exemple des tubes disposés chacun dans au moins un passant 42 et fixés à la pièce centrale 43 par emboîtement.The fabric comprises at least one pass 42 disposed along each radius 41 of the sectors 40. A central part 43 is fixed thereon. The frame 37 comprises flexible linear elements, for example tubes each arranged in at least one pass 42 and fixed to the central part 43 by interlocking.

Le dispositif de l'invention comprend ainsi un tissu cryotechnique découpé en secteurs puis assemblé, par couture ou par collage, en une seule pièce. Le long de chaque assemblage de secteur au moins un passant 42 est réalisé de façon à permettre l'introduction des tubes. Au centre de la calotte sphérique, que forme ledit dispositif, la pièce centrale 43, fixée sur ledit tissu de verre, sert pour la fixation desdits tubes. Des bandes auto-agrippantes maintiennent le feutre sur le tissu.The device of the invention thus comprises a cryogenic fabric cut into sectors and then assembled, by sewing or by gluing, in one piece. Along each sector assembly at least one pass 42 is made so as to allow the introduction of the tubes. At the center of the spherical cap formed by said device, the central part 43, fixed on said glass fabric, is used for fixing said tubes. Velcro strips hold the felt on the fabric.

Le dispositif de l'invention peut alors être fixé sur le réservoir en une seule opération de montage, la pièce centrale 43 venant se plaquer sur le fond du réservoir.The device of the invention can then be fixed to the tank in a single mounting operation, the central part 43 coming to be pressed against the bottom of the tank.

Le dispositif de l'invention combine ainsi le principe d'un "parapluie" de faible émissivité thermique, étudié de façon à épouser le fond d'un réservoir cryogénique à une distance suffisante pour former avec le matelas de feutre un matelas de gaz isolant, avec celui des systèmes de montage de type "tentes igloos". On obtient, ainsi, par fixation mécanique et flexion de tubes composites, une isolation dont l'armature est fixée sans contrainte et tient parfaitement sur le fond d'un réservoir, lors de mises en froid et en pression de celui-ci.The device of the invention thus combines the principle of an "umbrella" of low thermal emissivity, studied so as to match the bottom of a cryogenic tank at a sufficient distance to form with the felt mattress an insulating gas mattress, with that of mounting systems such as "igloo tents". Is thus obtained, by mechanical fixing and bending of composite tubes, an insulation whose reinforcement is fixed without constraint and fits perfectly on the bottom of a tank, when cold and pressure thereof.

Dans un exemple de réalisation préférentiel de l'invention, le tissu cryotechnique est un tissu de verre aluminisé double face, de classification d'inflammabilité M1, ayant une masse surfacique inférieure à 250 grammes au mètre carré et une contrainte à rupture en traction à 77 K supérieure à 100 MPa, dans le sens chaîne et trame. Le feutre d'une épaisseur de 20 à 100 mm est de préférence un polyester à frisure hélicoïdale, le liant est un copolymère d'acétate de vinyle, ajouté dans la proportion de 20 %. La pièce centrale 43 permet de fixer les tubes en composites à une distance d'environ 60 mm du centre de la calotte sphérique. La pièce centrale 43 et les tubes de l'armature sont en composite, en fibre de verre, très légers ou en aluminium.In a preferred embodiment of the invention, the cryogenic fabric is a double-sided aluminized glass fabric, of flammability classification M1, having a surface mass of less than 250 grams per square meter and a tensile breaking stress at 77 K greater than 100 MPa, in the warp and weft direction. The felt with a thickness of 20 to 100 mm is preferably a polyester with a helical crimp, the binder is a vinyl acetate copolymer, added in the proportion of 20%. The central part 43 makes it possible to fix the composite tubes at a distance of approximately 60 mm from the center of the spherical cap. The central part 43 and the tubes of the frame are made of composite, fiberglass, very light or aluminum.

Claims (13)

Dispositif d'isolation de fond de réservoir comprenant un ensemble matelassé formé d'au moins une couche de feutre (36) et d'un tissu cryotechnique (35) de manière à former un matelas de gaz isolant à la surface dudit fond de réservoir, caractérisé en ce qu'il comprend une armature (37) de fixation dudit ensemble sur le fond du réservoir.Tank bottom insulation device comprising a padded assembly formed by at least one layer of felt (36) and a cryogenic fabric (35) so as to form an insulating gas blanket on the surface of said tank bottom, characterized in that it comprises a frame (37) for fixing said assembly to the bottom of the tank. Dispositif selon la revendication 1, dans lequel le réservoir est un réservoir cryogénique.Device according to claim 1, in which the reservoir is a cryogenic reservoir. Dispositif selon la revendication 1, dans lequel l'ensemble matelassé a la forme d'une calotte sphérique.Device according to claim 1, in which the padded assembly has the shape of a spherical cap. Dispositif selon la revendication 3, dans lequel le tissu comprend plusieurs morceaux en forme de secteurs circulaires (40) assemblés entre eux par un de leurs rayons (41) pour former une calotte sphérique.Device according to claim 3, in which the fabric comprises several pieces in the form of circular sectors (40) joined together by one of their spokes (41) to form a spherical cap. Dispositif selon la revendication 4, dans lequel les couches de feutre sont fixées à ladite calotte sphérique au moyen de bandes auto-agrippantes.Device according to claim 4, in which the layers of felt are fixed to said spherical cap by means of hook-and-loop strips. Dispositif selon la revendication 4, dans lequel ladite calotte sphérique comprend au moins un passant (42) disposé le long de chacun des rayons des secteurs circulaires.Device according to claim 4, in which said spherical cap comprises at least one pass (42) disposed along each of the radii of the circular sectors. Dispositif selon la revendication 6, dans lequel une pièce centrale (43) est fixée sur ladite calotte sphérique.Device according to claim 6, in which a central part (43) is fixed to said spherical cap. Dispositif selon la revendication 7, dans lequel l'armature comprend des éléments linéaires flexibles disposés chacun dans au moins un passant (42) et fixés, en une de leurs extrémités, à la pièce centrale (43).Device according to claim 7, in which the armature comprises flexible linear elements each arranged in at least one passage (42) and fixed, at one of their ends, to the central part (43). Dispositif selon la revendication 8, dans lequel les éléments linéaires sont des tubes en composite verre-résine époxyde.Device according to claim 8, in which the linear elements are glass-epoxy resin composite tubes. Dispositif selon la revendication 1, dans lequel l'ensemble des couches en feutre a une épaisseur comprise entre 20 mm et 100 mm.Device according to claim 1, in which the set of felt layers has a thickness of between 20 mm and 100 mm. Dispositif selon la revendication 10 dans lequel le feutre comprend un polyester à frisure hélicoïdale et un liant en copolymère d'acétate de vinyle ajouté dans la proportion d'environ 20%.Device according to claim 10, in which the felt comprises a polyester with helical crimp and a binder of vinyl acetate copolymer added in the proportion of approximately 20%. Dispositif selon la revendication 1, dans lequel le tissu cryotechnique est un tissu de verre aluminisé double face.Device according to claim 1, in which the cryogenic fabric is a double-sided aluminized glass fabric. Dispositif selon la revendication 12, dans lequel le tissu cryotechnique est de classification d'inflammabilité M1, de masse surfacique inférieure à 250 grammes au mètre carré et de contrainte à rupture en traction à 77 K supérieure à 100 MPa dans le sens chaîne trame.Device according to claim 12, in which the cryogenic fabric is of flammability classification M1, of areal mass less than 250 grams per square meter and tensile breaking stress at 77 K greater than 100 MPa in the weft warp direction.
EP02291884A 2001-07-27 2002-07-25 Device for the insulation of the bottom of a reservoir Withdrawn EP1279884A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0110083A FR2827941B1 (en) 2001-07-27 2001-07-27 TANK BOTTOM ISOLATION DEVICE
FR0110083 2001-07-27

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EP1279884A1 true EP1279884A1 (en) 2003-01-29

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2860059A1 (en) * 2003-09-18 2005-03-25 Cryospace L Air Liquide Aerosp METHOD FOR THERMALLY INSULATING A DOUBLE BACKGROUND SEPARATING TWO ERGOLS FROM A RESERVOIR
EP1645793A2 (en) * 2004-10-08 2006-04-12 Cryospace l'air liquide aerospatiale Cryogenic insulation device
CN101614319B (en) * 2008-06-23 2013-03-27 南通中集罐式储运设备制造有限公司 Combined supporting and absorbing device and low-temperature multilayer heat insulating vessel having same
EP2726375B1 (en) 2011-07-01 2016-04-06 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Cryogenic fluid tank and its use

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2134320A1 (en) * 1971-07-09 1973-01-18 Linde Ag Liquefied gas storage tank - with inner membrane free to slide vertically relative to concrete wall
US4044184A (en) * 1973-06-27 1977-08-23 Mitsubishi Chemical Industries Ltd. Cryogenic insulating structure
FR2632051A1 (en) * 1988-05-24 1989-12-01 Hembert Claude Coating for protection against fire and heat
EP0565444A1 (en) * 1992-04-09 1993-10-13 Etienne Leflaive Storage tank for liquefied gas
DE19725818A1 (en) * 1997-06-18 1998-12-24 Linde Ag Heat insulation material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2134320A1 (en) * 1971-07-09 1973-01-18 Linde Ag Liquefied gas storage tank - with inner membrane free to slide vertically relative to concrete wall
US4044184A (en) * 1973-06-27 1977-08-23 Mitsubishi Chemical Industries Ltd. Cryogenic insulating structure
FR2632051A1 (en) * 1988-05-24 1989-12-01 Hembert Claude Coating for protection against fire and heat
EP0565444A1 (en) * 1992-04-09 1993-10-13 Etienne Leflaive Storage tank for liquefied gas
DE19725818A1 (en) * 1997-06-18 1998-12-24 Linde Ag Heat insulation material

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2860059A1 (en) * 2003-09-18 2005-03-25 Cryospace L Air Liquide Aerosp METHOD FOR THERMALLY INSULATING A DOUBLE BACKGROUND SEPARATING TWO ERGOLS FROM A RESERVOIR
EP1645793A2 (en) * 2004-10-08 2006-04-12 Cryospace l'air liquide aerospatiale Cryogenic insulation device
EP1645793A3 (en) * 2004-10-08 2010-12-08 Cryospace l'air liquide aerospatiale Cryogenic insulation device
CN101614319B (en) * 2008-06-23 2013-03-27 南通中集罐式储运设备制造有限公司 Combined supporting and absorbing device and low-temperature multilayer heat insulating vessel having same
EP2726375B1 (en) 2011-07-01 2016-04-06 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Cryogenic fluid tank and its use
EP2726375B2 (en) † 2011-07-01 2019-05-08 L'Air Liquide Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude Cryogenic fluid tank and its use

Also Published As

Publication number Publication date
FR2827941A1 (en) 2003-01-31
FR2827941B1 (en) 2003-10-31

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