Tank comprising at least one peripheral connecting blade connection system connecting an interior structure and an enclosure, aircraft comprising at least one such tank

Abstract

Tank comprising at least one connecting system with peripheral joining blades connecting an interior structure and an enclosure, aircraft comprising at least one such tank The invention relates to a tank comprising at least a first connecting system (34) which connects an enclosure (22) and an interior structure (24) positioned in the enclosure (22) and comprises several blades (38), distributed around the interior structure (24), which each have at least a first fixing point (38.1) connected to the interior structure (24) as well as at least a second fixing point (38.2) connected to the enclosure (22); each blade (38) being configured to allow, between the first and second fixing points (38.1, 38.2), dimensional variations which have at least one component in a transverse plane substantially perpendicular to the axis (A22) of the enclosure (22). The invention also relates to an aircraft comprising at least one such tank.Figure 4.

Description

Title of the invention: Tank comprising at least one connection system with peripheral junction blades connecting an interior structure and an enclosure, aircraft comprising at least one such tank

[0001] The present application relates to a tank which comprises at least one connection system with peripheral joining blades connecting an interior structure and an enclosure as well as to an aircraft comprising at least one such tank.

[0002] According to an embodiment in accordance with the prior art visible in [Fig.l], a hydrogen tank 10 for a cryogenic fluid, such as hydrogen for example, comprises an external enclosure 12, an internal enclosure 14 positioned in the external enclosure 12, thermal insulation between the external and internal enclosures 12, 14 as well as two diametrically opposed connecting systems 16, 16' connecting the external and internal enclosures 12, 14. In operation, due to the storage temperature of the hydrogen in the cryogenic state, the internal enclosure 14 contracts much more than the external enclosure 12. Consequently, at least one of the two connecting systems 16 is configured to allow movement of the internal enclosure 14 relative to the external enclosure 12 in a direction of movement parallel to the axis of the external enclosure A12. Generally, a first 16' connection system (the one on the left in [Fig.l]) is rigid and does not allow any relative movement between the external and internal enclosures 12, 14 while a second connection system 16 (the one on the right in [Fig.l]) allows relative movement between the external and internal enclosures 12, 14 to compensate for dimensional variations between the external and internal enclosures due in particular to expansion phenomena.

[0003] This second connection system 16 comprises for example a female sleeve 18.1 secured to the external enclosure 12 as well as a male sleeve 18.2 secured to the internal enclosure 14 and configured to slide in the female sleeve 18.1. These two female and male sleeves 18.1, 18.2 are coaxial and have axes coincident with the direction of movement.

[0004] The connecting systems 16, 16' being positioned at the ends of the external and internal enclosures 12, 14, it is not possible to position other elements at this location such as tube passages for example.

[0005] The present invention aims to remedy all or part of the drawbacks of the prior art by developing an alternative solution making it possible to free at least one end of the tank, in particular the one at which the rigid connection system 16' is located, while allowing radial expansions.

[0006] To this end, the invention relates to a tank comprising an enclosure which has an axis, an interior structure positioned in the enclosure as well as at least one first connection system connecting the interior structure and the enclosure.

[0007] According to the invention, the first connection system comprises several blades, distributed around the interior structure, which each have at least one first fixing point connected to the interior structure at at least one first fixing zone as well as at least one second fixing point connected to the enclosure at at least one second fixing zone, each blade being configured to allow, between the first and second fixing points, dimensional variations which have at least one component in a transverse plane substantially perpendicular to the axis of the enclosure.

[0008] This first connection system allows movements of the interior structure relative to the enclosure due in particular to expansion phenomena in the radial direction.

[0009] According to another characteristic, each blade has first and second faces respectively pressed against the first and second fixing zones at the first and second fixing points and substantially parallel to the axis of the enclosure at the first and second fixing points.

[0010] According to another characteristic, each of the first and second fixing zones is approximately cylindrical and substantially coaxial with the axis of the enclosure.

[0011] Each blade has a longitudinal axis passing through the first and second fixing points. According to a first arrangement, the longitudinal axis of at least one blade forms an angle of the order of 90° with a transverse plane perpendicular to the axis of the enclosure. According to a second arrangement, the longitudinal axis of at least one blade forms an angle of less than 75° with a transverse plane perpendicular to the axis of the enclosure. According to a third arrangement, the longitudinal axis of at least one blade forms an angle of the order of 0° with a transverse plane perpendicular to the axis of the enclosure.

[0012] According to another characteristic, each blade extends between first and second ends, at least one blade comprising first and second fixing points respectively located at the first and second ends of the blade.

[0013] According to another characteristic, the first connecting system comprises blades arranged symmetrically with respect to a vertical median plane passing through the axis of the enclosure.

[0014] According to another characteristic, the first connection system comprises blades with two fixing points, positioned symmetrically with respect to the vertical median plane, each comprising first and second fixing points respectively located at the first and second ends of the blade, the blades located to the right of the vertical median plane, each comprising a second fixing point offset relative to the first fixing point in a first direction among a clockwise direction and an anticlockwise direction, the blades located to the left of the vertical median plane, each comprising a second fixing point offset relative to the first fixing point in a second direction, different from the first direction, among the clockwise direction and the anticlockwise direction.

[0015] According to another characteristic, the enclosure comprises a tubular body, first and second end walls as well as at least one joining ring interposed between the tubular body and one of the first and second end walls, the joining ring having an interior surface which corresponds to the second fixing zone and to which the second fixing points of the blades of the first connecting system are connected.

[0016] According to another characteristic, the reservoir comprises, for at least one blade, an intermediate piece positioned between the second point of attachment of the blade and the enclosure.

[0017] According to another characteristic, the enclosure comprises, at least one second point of attachment of a blade, at least one boss which has at least one hole configured to house at least one barrel nut of a fixing element connecting the blade and the enclosure.

[0018] According to a first configuration, the internal structure is an anti-ballot system or an internal support.

[0019] According to another characteristic, the anti-sway system or the internal support comprises a fixing ring which extends continuously over the entire circumference of the tank and has an external surface which corresponds to the first fixing zone and to which the first fixing points of each blade of the first connection system are connected.

[0020] According to a second configuration, the interior structure is an internal enclosure.

[0021] The invention also relates to an aircraft comprising at least one tank according to one of the preceding characteristics.

[0022] Other characteristics and advantages will emerge from the description of the invention which follows, a description given by way of example only, with reference to the appended drawings, among which:

[0023] [Fig. 1] is a longitudinal section of a tank illustrating an embodiment of prior art,

[0024] [Fig.2] is a perspective view illustrating a tank equipped with an anti- sloshing (visible by transparency) illustrating an embodiment of the invention,

[0025] [Fig.3] is a perspective view of a part of an anti-sloshing system equipped of peripheral joining blades illustrating an embodiment of the invention,

[0026] [Fig.4] is a cross-section of a peri-junction blade connection system sphericals illustrating an embodiment of the invention,

[0027] [Fig.5] is a perspective view of part of a blade connection system of peripheral junction illustrating an embodiment of the invention,

[0028] [Fig.6] shows perspective views of different stages of assembly of a enclosure equipped with peripheral junction blades illustrating an embodiment of the invention,

[0029] [Fig.7] is a perspective view of a peripheral joining blade attached to a crown of a tank enclosure illustrating an embodiment of the invention,

[0030] [Fig.8] shows perspective views of different stages of assembly of a enclosure equipped with peripheral junction blades illustrating an embodiment of the invention,

[0031] [Fig.9] represents front views of a peripheral junction blade illustrating dif different configurations of the invention,

[0032] [Fig. 10] is a perspective view of a peripheral joining blade attachment illustrating an embodiment of the invention,

[0033] [Fig. 11] is a perspective view of a portion of a peripheral junction blade connection system illustrating one embodiment of the invention,

[0034] [Fig. 12] is a perspective view of a portion of a peripheral junction blade connection system illustrating one embodiment of the invention,

[0035] [Fig. 13] is a cross-section of a peripheral joining blade connection system illustrating one embodiment of the invention,

[0036] [Fig. 14] is a perspective view of an internal enclosure connected to an external enclosure of a tank by a peripheral connecting blade connection system illustrating an embodiment of the invention,

[0037] [Fig.15] is a side view of a part of the connection system of [Fig.14] visible through transparency.

[0038] According to an embodiment visible in [Fig.2], a tank 20 comprises an enclosure 22 as well as an anti-sloshing system 24 positioned in the enclosure 22. The latter may be an internal enclosure of the tank 20 positioned inside an external enclosure (not shown).

[0039] According to another embodiment visible in figures 14 and 15, a tank 20' comprises an external enclosure 22 as well as an internal enclosure 24' positioned in the external enclosure 22.

[0040] Whatever the embodiment, a tank 20, 20' comprises an enclosure 22 as well as an interior structure 24, such as an anti-sway system, an internal support (intended to support equipment for example) or an internal enclosure for example, positioned in the enclosure 22. The enclosure 22 and the interior structure 24 can be made of the same material or different materials.

[0041] The enclosure 22 (respectively the internal enclosure 24' in the other embodiment corresponding to figures 14 and 15) is sealed to contain a fluid, more particularly a liquid.

[0042] According to a non-limiting embodiment, an anti-sloshing system comprises a set of plates, positioned in intersecting planes and substantially perpendicular to each other, limiting the movements of the liquid stored in the enclosure 22.

[0043] According to one application, an aircraft comprises at least one tank 20, 20' configured to store hydrogen, in particular hydrogen in the cryogenic state.

[0044] According to one embodiment, an enclosure 22 comprises a cylindrical tubular body 26 (also called a shell) which extends between first and second ends 26.1, 26.2, a first end wall 28 connected, in a sealed manner, at a first junction zone Z1 to the first end 26.1 of the tubular body 26 as well as a second end wall 30 connected in a sealed manner, at a second junction zone Z2, to the second end 26.2 of the tubular body 26. According to one configuration, each of the first and second end walls 28, 30 has a dome shape. Of course, the invention is not limited to this configuration.

[0045] According to a first assembly technique, each of the first and second end walls 28, 30 is directly connected to the tubular body 26 by a sealed weld bead which extends over the entire circumference of the enclosure 22 for example.

[0046] According to a second assembly technique visible in particular in figures 2 and 14, the enclosure 22 comprises at least one junction ring 32 interposed between the tubular body 26 and one of the first and second end walls 28, 30, said junction ring 32 being connected by a first sealed weld bead to the tubular body 26 and by a second sealed weld bead to the first or second end wall 28, 30.

[0047] The enclosure 22 comprises an axis of revolution A22 which corresponds to the axis of the tubular body 26.

[0048] For the remainder of the description, a longitudinal direction X is parallel to the axis of revolution A22. A radial direction is perpendicular to the longitudinal direction X. A longitudinal plane is a plane passing through the axis of revolution A22. A vertical median plane PMV is a vertical plane passing through the axis of revolution A22. A transverse plane is perpendicular to the axis of revolution A22. When the aircraft or the tank is on the ground, a transverse and horizontal direction Y is perpendicular to the longitudinal direction X and substantially horizontal. A transverse and vertical direction Z is perpendicular to the longitudinal direction X and substantially vertical.

[0049] Each end wall 28, 30 has an edge B28, B30, positioned in a plane transverse, directly or indirectly connected (via the junction crown 32) to the tubular body 26 as well as a vertex S28, S30 located at the level of the axis of revolution A22 of the enclosure 22.

[0050] The interior structure 24 comprises a first end 24.1 oriented towards the first end wall 28 as well as a second end 24.2 oriented towards the second end wall 30.

[0051] The tank 20 comprises at least one connection system 34 connecting the interior structure 24 and the enclosure 22.

[0052] According to one embodiment, the tank 20 comprises a first connection system 34 connecting at least one first fixing zone ZF1 secured to the interior structure 24 and at least one second fixing zone ZF2 secured to the enclosure 22, said second fixing zone ZF2 being spaced from the top S28 of the first end wall 28 and located close to the first junction zone ZI of the enclosure 22, as well as a second connection system 36 connecting the second end 24.2 of the interior structure 24 and the second end wall 30 of the enclosure 22, said second connection system 36 being positioned at the axis of revolution A22 of the enclosure 22.

[0053] According to one configuration, the second connecting system 36 may be of the rigid or sliding type, as for the prior art, and allow dimensional variations in the axial direction.

[0054] According to a particular feature, the first connection system 34 comprises several blades 38, distributed around the interior structure 24, which each have at least one first fixing point 38.1, directly or indirectly connected to the interior structure 24 at the first fixing zone ZF1, as well as at least one second fixing point 38.2 directly or indirectly connected to the enclosure 22 at the second fixing zone ZF2 located near the first junction zone ZI. Given that it comprises several blades 38 distributed around the interior structure 24 (redundancy of the blades 38), the first connection system 34 is more robust to failure than a system according to the prior art comprising a male sleeve and a female sleeve sliding relative to each other.

[0055] According to one arrangement, each of the first and second fixing zones ZF1, ZF2 is approximately cylindrical, substantially coaxial with the axis A22 of the enclosure 22 and extends over the entire circumference of the tank 20. The first fixing zone ZF1 has a diameter smaller than that of the second fixing zone ZF2.

[0056] In addition, as illustrated in [Fig.4], each blade 38 is configured to allow, between the first and second fixing points 38.1, 38.2, dimensional variations which have at least one component in a transverse plane (substantially perpendicular to the axis A22 of the enclosure 22).

[0057] Each blade 38 has first and second faces F38, F38' substantially parallel to each other which form, in a longitudinal plane, with the axis A22 of the enclosure 22 (or the longitudinal direction X) an angle of less than 45° at the first and second fixing points 38.1, 38.2, a first face F38 being pressed against the first fixing zone ZF1 at each first fixing point 38.1, the second face F38' being pressed against the second fixing zone ZF2 at each second fixing point 38.2. According to a preferred embodiment, the first and second faces F38, F38' are substantially parallel to the axis A22 of the enclosure 22 at the first and second fixing points 38.1, 38.2.

[0058] According to an embodiment visible in particular in figures 3 to 13, when the internal structure 24 is an anti-sway system or an internal support, the latter comprises a fixing ring 40 which extends continuously over the entire circumference of the tank 20 and has an external surface which corresponds to the first fixing zone ZF1 and to which the first fixing points 38.1 of the blades 38 of the first connecting system 34 are connected.

[0059] According to another embodiment visible in [Fig. 15], when the internal structure 24 is an internal enclosure 24' comprising a tubular body, first and second end walls directly or indirectly connected to the tubular body as well as possibly at least one junction ring connecting the tubular body and one of the end walls, the first fixing zone ZF1 being located at the level of the tubular body or the possible junction ring, the first fixing points 38.1 of each blade 38 being connected to the tubular body or to the possible junction ring of the internal enclosure.

[0060] According to one assembly method, each first fixing point 38.1 is connected to the interior structure 24 by a rigid connection comprising fixing elements 42, such as bolts, screws or rivets, or obtained by welding, by gluing or by any other assembly technique.

[0061] The first fixing points 38.1 of the blades 38 are directly connected to the interior structure 24 or indirectly connected to the interior structure 24 by means of intermediate pieces each positioned between the blade 38 and the interior structure 24.

[0062] According to an embodiment visible in Figures 4 to 10, the second fixing point 38.2 of each blade 38 is connected to the junction ring 32 connecting the tubular wall 26 and the first end wall 28 of the enclosure 22. The junction ring 32 has an interior surface which corresponds to the second fixing zone ZF2 and to which the second fixing points 38.2 of the blades 38 of the first connection system 34 are connected.

[0063] According to another embodiment visible in [Fig. 11], the second point of fixing 38.2 of each blade 38 is connected to the tubular body 26 of the enclosure 22, near the first junction zone Zl.

[0064] According to a first configuration visible in particular in [Fig.7], the second fixing point 38.2 of each blade 38 is directly connected to the enclosure 22 by a rigid connection comprising fixing elements 44, such as bolts, screws or rivets, or obtained by welding, by gluing or by any other assembly technique.

[0065] According to a second configuration visible in [Fig. 12], the reservoir 20 comprises, for at least one blade 38, an intermediate piece 45 positioned between the second fixing point 38.2 of the blade 38 and the enclosure 22.

[0066] According to an embodiment visible in [Fig. 10], the enclosure 22 comprises, at least one second fixing point 38.2 of a blade 38, at least one boss 46 which has at least one hole 46.1 oriented in the longitudinal direction X and configured to house at least one barrel nut of a fixing element 44 connecting the blade 38 and the enclosure 22. This embodiment makes it possible to avoid drilling in a radial direction the tubular wall 26 or the junction ring 32 of the enclosure 22, which could reduce the strength of said enclosure 22.

[0067] In the same way, the internal structure 24 may comprise, at right angles to each first fixing point 38.1, at least one boss 46 which has at least one hole 46.1 oriented in the longitudinal direction X and configured to house at least one barrel nut of a fixing element 42.

[0068] Each blade 38 has a longitudinal axis D38 passing through the first and second fixing points 38.1, 38.2.

[0069] According to a first arrangement visible in part (A) of [Fig.9], the longitudinal axis D38 of at least one blade 38 forms an angle a of the order of 90° with a transverse plane or is substantially parallel to the axis A22 of the enclosure.

[0070] According to a second arrangement visible in part (B) of [Fig.9], the longitudinal axis D38 of at least one blade 38 forms with a transverse plane an angle a less than 75°, preferably between 25 and 75°, of the order of 60°.

[0071] According to a third arrangement visible in part (C) of [Fig.9], the longitudinal axis D38 of at least one blade 38 forms an angle a of the order of 0° with a transverse plane.

[0072] The closer the longitudinal axis D38 of a blade 38 is to the longitudinal direction X of the enclosure 22, the more the blade 38 tolerates significant movements in the longitudinal direction X, due to expansion / retraction phenomena, between the enclosure 22 and the internal structure 24. The closer the longitudinal axis D38 of a blade 38 is to a transverse plane, the more the blade 38 restricts movements in the longitudinal direction X, due to expansion / retraction phenomena, between the enclosure 22 and the internal structure 24. Conversely, the closer the longitudinal axis D38 of a blade 38 is close to the longitudinal direction X of the enclosure 22, the less the stiffness of the blade 38 is significant in the longitudinal direction X. The closer the longitudinal axis D38 of a blade 38 is to a transverse plane, the greater the stiffness of the blade 38 is significant in the longitudinal direction X.

[0073] According to one configuration, the longitudinal axes D38 of all the blades 38 of the first connecting system 34 form the same angle with the longitudinal direction X. According to another configuration, the longitudinal axes D38 of the blades 38 of the first connecting system 34 form different angles with the longitudinal direction X.

[0074] Each blade 38 extends between a first end 38A and a second end 38B.

[0075] According to an embodiment visible in Figures 3 to 13, at least one blade 38 comprises two fixing points, the first and second fixing points 38.1, 38.2 being respectively located at the first and second ends 38A and 38B of the blade 38.

[0076] According to one arrangement, the second fixing point 38.2 of each blade 38 is offset clockwise relative to the first fixing point 38.1. According to another arrangement, the second fixing point 38.2 of each blade 38 is offset counterclockwise relative to the first fixing point 38.1. These arrangements allow slight rotational movements about the axis of revolution A22, between the interior structure 24 and the enclosure 22.

[0077] According to another arrangement visible in [Fig. 4], the first connecting system 34 comprises, to the right of a vertical median plane PMV, blades 38 whose second fixing point 38.2 is offset relative to the first fixing point 38.1 in a first direction among the clockwise direction and the counterclockwise direction and, to the left of the vertical median plane PMV, blades 38 whose second fixing point 38.2 is offset relative to the first fixing point 38.1 in a second direction, different from the first direction, among the counterclockwise direction and the clockwise direction. For example, the first and second directions correspond respectively to the clockwise and counterclockwise directions. According to this arrangement, the internal structure 24 is immobilized in rotation relative to the enclosure 22 and can move in a transverse plane.

[0078] Of course, the invention is not limited to these numbers or these arrangements for the blades 38. The blades 38 may be metallic or made of composite material.

[0079] The first connecting system 34 makes it possible to control the free and blocked movements between the interior structure 24 and the enclosure 22. This first connecting system 34 has at least one stiffness in at least one direction configured as a function of at least one characteristic among the angle formed between the longitudinal direction X and the longitudinal axis D38 of each blade 38, the direction of offset between the first and second fixing points of each blade 38, the position of the blades 38 and the material of the blades 38.

[0080] According to an operating mode visible in Figures 6 to 8, an assembly method comprises a first step of assembling the first end wall 28 and the junction ring 32 as illustrated in part (B) of [Fig.6], a second step of fixing the blades 38 on the junction ring 32 by connecting the second fixing point 38.2 of each blade 38 to the junction ring 32 using the fixing elements 44 as illustrated in part (C) of [Fig.6] and [Fig.7], a third step of mounting the internal structure 24 by connecting the first fixing point 38.1 of each blade 38 and the internal structure 24 using the fixing elements 42 as illustrated in [Fig.8] and, finally, a step of assembling the tubular body 26 by connecting it to the junction ring 32 so as to close the enclosure 22, the second end wall 30 being already connected to the tubular body 26.

[0081] Of course, the invention is not limited to this operating mode for assembly.

Claims

Claims

1. Tank comprising an enclosure (22) which has an axis (A22), an interior structure (24) positioned in the enclosure (22) as well as at least one first connecting system (34) connecting the interior structure (24) and the enclosure (22), characterized in that the first connecting system (34) comprises several blades (38), distributed around the interior structure (24), which each have at least one first fixing point (38.1) connected to the interior structure (24) at at least one first fixing zone (ZF1) as well as at least one second fixing point (38.2) connected to the enclosure (22) at at least one second fixing zone (ZF2), each blade (38) being configured to allow, between the first and second fixing points (38.1, 38.2), dimensional variations which have at least one component in a transverse plane substantially perpendicular to the axis (A22) of the enclosure (22).

2. Tank according to the preceding claim, characterized in that each blade (38) has first and second faces (F38, F38') respectively pressed against the first and second fixing zones (ZF1, ZF2) at the first and second fixing points (38.1, 38.2) and substantially parallel to the axis (A22) of the enclosure (22) at the first and second fixing points (38.1, 38.2).

3. Tank according to the preceding claim, characterized in that each of the first and second fixing zones (ZF1, ZF2) is approximately cylindrical and substantially coaxial with the axis (A22) of the enclosure (22).

4. Tank according to one of the preceding claims, characterized in that each blade (38) has a longitudinal axis (D38) passing through the first and second fixing points (38.1, 38.2), the longitudinal axis (D38) of at least one blade (38) forming an angle (a) of the order of 90° with a transverse plane perpendicular to the axis (A22) of the enclosure (22).

5. Tank according to one of claims 1 to 2, characterized in that each blade (38) has a longitudinal axis (D38) passing through the first and second fixing points (38.1, 38.2), the longitudinal axis (D38) of at least one blade (38) forming an angle (a) less than 75° with a transverse plane perpendicular to the axis (A22) of the enclosure (22).

6. Tank according to the preceding claim, characterized in that the longitudinal axis (D38) of at least one blade (38) forms an angle (a) of the order of 0° with a transverse plane perpendicular to the axis (A22) of the enclosure (22).

7. Tank according to one of the preceding claims, characterized in that each blade (38) extends between first and second ends (38A, 38B), at least one blade (38) comprising first and second fixing points (38.1, 38.2) respectively located at the first and second ends (38A, 38B) of the blade (38).

8. Tank according to one of the preceding claims, characterized in that the first connection system (34) comprises blades (38) arranged symmetrically with respect to a vertical median plane (PMV) passing through the axis (A22) of the enclosure (22).

9. Tank according to the preceding claim, characterized in that the first connection system (34) comprises blades (38) with two fixing points, positioned symmetrically with respect to the vertical median plane (PMV), each comprising first and second fixing points (38.1, 38.2) respectively located at the first and second ends (38A and 38B) of the blade (38), the blades (38) located to the right of the vertical median plane (PMV) each comprising a second fixing point (38.2) offset with respect to the first fixing point (38.1) in a first direction among a clockwise direction and an anticlockwise direction, the blades (38) located to the left of the vertical median plane (PMV) each comprising a second fixing point (38.2) offset with respect to the first fixing point (38.1) in a second direction, different from the first direction, among the clockwise direction and the anticlockwise direction.

10. Tank according to one of the preceding claims, characterized in that the enclosure (22) comprises a tubular body (26), first and second end walls (28, 30) as well as at least one joining ring (32) interposed between the tubular body (26) and one of the first and second end walls (28, 30), the joining ring (32) having an inner surface which corresponds to the second fixing zone (ZF2) and to which the second fixing points (38.2) of the blades (38) of the first connecting system (34) are connected.

11. Tank according to one of the preceding claims, characterized in that the tank (20) comprises, for at least one blade (38), a part spacer (45) positioned between the second fixing point (38.2) of the blade (38) and the enclosure (22).

12. Tank according to one of the preceding claims, characterized in that the enclosure (22) comprises, at least one second fixing point (38.2) of a blade (38), at least one boss (46) which has at least one hole (46.1) configured to house at least one barrel nut of a fixing element (44) connecting the blade (38) and the enclosure (22).

13. Tank according to one of the preceding claims, characterized in that the internal structure (24) is an anti-sway system or an internal support.

14. Tank according to the preceding claim, characterized in that the anti-sway system or the internal support comprises a fixing ring (40) which extends continuously over the entire circumference of the tank (20) and has an external surface which corresponds to the first fixing zone (ZF1) and to which the first fixing points (38.1) of each blade (38) of the first connecting system (34) are connected.

15. Tank according to one of claims 1 to 12, characterized in that the internal structure (24) is an internal enclosure.

16. Aircraft comprising at least one tank according to one of the preceding claims.

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