Use of a fiber composite connecting section for connecting a tubular fiber composite structure to a connecting device

Abstract

The invention relates to the use of a fiber composite connection section (210) for connecting a tubular fiber composite structure to a connection device (260), the connection section having at least one fiber steering element (211, 212, 213) inside it, the extension direction of the long fibers of the fiber composite component following the shape of the fiber steering section of the fiber steering element (211, 212, 213) such that the fiber direction of the long fibers is steered on the fiber steering section, and the long fibers (201a, 202a, 203a) not completely surrounding the fiber steering element (211, 313, 213), the long fibers being respectively assigned to the fiber steering element, the fiber steering element (211, 212, 213) being made of fiber composite material for a pressure vessel.

Description

Technical Field

[0001] The invention relates to the use of a fiber composite connection section for connecting a tubular fiber composite structure to a joining device, the fiber composite structure having more circumferential layers than longitudinal lines, the connection section having at least one fiber turning element inside it, the extension direction of the longitudinal lines of the fiber composite member following the shape of the fiber turning section of the fiber turning element, so that the fiber direction of the long fibers is turned on the fiber turning section, and the long fibers do not completely wrap around the fiber turning element, the long fibers are respectively arranged in cooperation with the fiber turning element, and the fiber turning element is made of fiber composite material for a pressure vessel. Background Art

[0002] In order to connect fiber composites to components, the connection methods known for metal materials are often inapplicable or can only be applied at the expense of the strength of the connection. In particular, the strength of the connection between the fiber composite and the component is reduced due to fiber separation and interruption of the fiber composite. Such fiber interruptions occur, for example, when drilling or trimming the fiber composite to insert the component to be connected through the hole or adhere to the trimmed edge.

[0003] Therefore, a fiber composite connection section for connecting a fiber composite structure to a connection device without cutting the long fibers of the fiber composite is known.

[0004] WO2016 / 008858A1 describes a fiber composite connection section for connecting a fiber composite structure to a connection device. Here, the connection section has at least one fiber turning element inside it, the extension direction of the first long fibers of the fiber composite member following the shape of the first fiber turning element, so that the fiber direction of the first long fibers is turned on the first fiber turning section. The extension direction of the second long fibers of the fiber composite structure follows its second section or the second fiber turning element, so that the fiber direction of the second long fibers is turned on the second fiber turning section. The two fiber turning sections are spatially separated from each other. On the connection section, a first fixing protrusion and a second fixing protrusion spatially separated from the first fixing protrusion are respectively configured for force transmission into the connection section, and the first fixing protrusion is constructed by the first fiber turning element and the first long fibers, and the second fixing protrusion is constructed by the second fiber turning element and the second long fibers. The long fibers extending from the fiber composite structure or the fiber composite member to the fixing section are divided and distributed onto a plurality of fixing protrusions. Therefore, the tensile force and pressure transmitted to the long fibers can be transmitted into another component. Here, the fiber composite component can be constructed as a rod or a tube as a tensile and compressive element. Most of the fibers can be particularly arranged with the fiber direction along the longitudinal direction of the rod or the tube.

[0005] EP0082021A2 describes the fixation of a ring, especially a metal ring, on an object which has a wall or skirt made of a fiber-reinforced synthetic resin material. The ring has a plurality of external grooves. Then, for each groove, the skirt includes a first layer and a second layer of fiber-reinforced resin material. The fibers in the first layer are substantially parallel to the axis of the ring and extend from the skirt into the corresponding groove. The second layer is located above the first layer and is composed of an annular coil which extends from the skirt in the direction towards the groove. The second layer is at least partially located in the groove for fixing the first layer in the groove. This layering is repeated for each groove, and finally the subsequent annular coils are wound around the whole product. Summary of the Invention

[0006] The object of the present invention is to provide a pressure tank resistant to high pressure.

[0007] This object is achieved by the application of a fiber composite connection section for connecting a tubular fiber composite structure to a connection device, the fiber composite structure having more circumferential layers than longitudinal threads, the connection section having at least one fiber turning element inside it, the extending direction of the long fibers of the fiber composite member following the shape of the fiber turning section of the fiber turning element such that the fiber direction of the long fibers turns on the fiber turning section, and the long fibers do not completely surround the fiber turning element, the long fibers being respectively matched with the fiber turning element, the fiber turning element being composed of fiber composite material, and there being no fixed connection between the tubular fiber composite structure and the connection device for a pressure tank.

[0008] The pressure tank can be designed as an internal pressure tank and an external pressure tank. Here, the pressure tank is composed of a tubular fiber composite structure which is connected to a connection device via a fiber composite connection section. In order to connect the fiber composite structure to the connection device, the long fibers in the fiber composite structure can extend along the surface section of the fiber turning element. Here, it is not necessary to wrap the fiber turning element with long fibers. The surface section at least partially constitutes the outer surface of the connection section. The surface section extends at an angle between 20° and 60°, especially preferably 45°, from the direction of the long fibers extending into the connection section. The long fibers also extend along the sections on adjacent fiber turning elements, and the sections on adjacent fiber turning elements change the direction of the long fibers. After the direction change, the long fibers extend along the surface of the fiber turning element. Due to the change in fiber direction, the outer surface of the fiber turning element can be understood as a fiber turning section for the fibers. Regarding the long fibers, since the fibers extend along a curved surface, the corresponding adjacent fiber turning elements also fulfill the function of the fiber turning section.

[0009] The fiber turning elements can each have a protruding tip in the direction towards the connecting device. Here, the long fibers reach up to the tip to the greatest extent, such that the fiber turning elements are not completely surrounded by the long fibers. After the long fibers are turned onto the fiber turning elements, they do not significantly change their direction again. The surfaces of the fiber turning elements along which the long fibers extend respectively reach at least near the tip and, after a preferably 90° turn, transition into a respective other surface which extends from the tip in the direction towards the interior of the connecting section. At the end of this surface, notches are respectively provided, after which the outer surface of the connecting section continues in the next fiber turning element, provided that this fiber turning element is not the last fiber turning element. The two surfaces which contact at the tip preferably form the sides of an equilateral triangle. The surfaces form a V-shaped recess of the connecting device. The long fibers preferably each belong to their own fiber layer. Here, the long fibers can be inserted into the outer surface of the fiber turning elements.

[0010] Advantageously, compared to conventional metallic, but also conventionally wound, fiber composite pressure vessels (type 4), the application of tubular fiber composite structures enables weight and cost reduction. This weight and cost reduction is particularly advantageous in the field of H2 high-pressure tanks in mobile applications such as motor vehicles, ships, aircraft, and space travel.

[0011] The fiber turning elements can be implemented as mutually independent fiber turning elements. Alternatively, the fiber turning elements can be implemented as helical, integral fiber turning elements.

[0012] Advantageously, in the present invention, a smaller diameter can be obtained for the tubular fiber composite structure of the pressure vessel. In this way, the diameter of the pressure vessel can be less than 100 mm. For example, for conventional H2 high-pressure tanks manufactured by the winding method, the minimum diameter is determined by the boss section. If this minimum diameter is 100 mm, the outer diameter of the pressure vessel cannot be less than approximately 130 mm, because a pressure vessel manufactured by the winding method requires a boss section wound with fibers to receive the longitudinal forces caused by overpressure. Therefore, in addition to providing a cylindrical section with an internal thread for receiving the safety valve, the boss section must have a clearly visible disc-shaped section with a larger diameter, which ultimately serves as a turning zone during winding and additionally absorbs the longitudinal forces caused by the internal pressure here. The function of receiving the longitudinal forces during the transition of the load from the cylindrical composite material area to the often metallic dome area is achieved more compactly and with a lower stress concentration by the present invention.

[0013] Advantageously, compared to a conventionally wound internal pressure vessel, a tubular fiber composite structure with connecting means can be loaded by internal pressure and external pressure. Thus, these tubular fiber composite structures with connecting means are also used as high-pressure vessels nested within one another, and the inner vessel can also have a lower internal pressure relative to the outer vessel and thus practically constitute a vessel loaded by external pressure. Generally, the minimum burst pressure of these high-pressure vessels is approximately 1575 bar.

[0014] Advantageously, the fiber composite structure and the connecting means can be connected without adhesion. The force transmission of tension and pressure is achieved by form-locking the connecting means with the deviating element and the long fibers of the fiber composite structure. Thereby, no tension is generated when the temperature changes. Advantageously, in order to fix the connecting means, the fibers are not interrupted. Such an interruption of the fibers can have a negative impact on the strength of the fiber composite structure. Since there are no penetrations by connecting elements such as bolts or screws, stress corrosion also does not occur. Using different materials with different coefficients of thermal expansion does not cause tension between the force-introducing tubular fiber composite structure and the connecting means even due to a large temperature difference, because there is no fixed connection as in the case of adhesion, for example. For this reason, the pressure vessels are also suitable for cryogenic applications, such as cryogenic high-pressure storage. The pressure vessel can, for example, be designed as a double-walled vessel having a cryogenic inner vessel, for example for liquid H2 and gaseous H2 in the outer vessel. Cryogenic vessels are usually protected by a very costly vacuum insulation layer against the warming of the cryogenic contents. If the temperature of the cryogenic contents (e.g., H2) is higher than 20 K, a part of the contents must be blown off in order to re-cool the remaining contents. Then, in the double-walled outer pressure vessel / inner pressure vessel, it passes from the inner vessel to the outer vessel and is further available there as gaseous H2.

[0015] Due to the large number of circumferential layers of the tubular fiber composite structure, the tubular fiber composite structure can be loaded by a higher internal pressure and external pressure. Advantageously, the forces generated by the internal pressure or the external pressure in the cylindrical part of the vessel are received particularly by the circumferential layers. Thereby, high-pressure vessels with a burst pressure of, for example, 1575 bar can be manufactured using the tubular fiber composite structure. Here, the total number of pressure layers of the tubular fiber composite structure particularly preferably has twice as many circumferential layers as longitudinal lines.

[0016] It is expedient here that the fiber composite of the fiber deviating element consists mainly of circumferential layers.

[0017] Preferably, the V-shaped recess of the connecting device is filled with a circumferential layer made of fiber composite material. Preferably, when used as a pressure tank, the circumferential layer is wound around the entire connecting device, more precisely, the ratio of the circumferential layer (preferably about 2 / 3) to the longitudinal layer (preferably about 1 / 3) is relative to the total wall thickness. By winding the circumferential layer, the long fibers of the tubular fiber composite structure with the connecting device are fixed.

[0018] By orienting the fibers of the fiber turning element in the circumferential direction, the tensile force, pressure and torsional force transmitted to the fiber turning element via the long fibers of the fiber composite structure are converted into circumferential forces in the fibers of the fiber turning element in the connecting section. This enables a favorable introduction of the force into the fiber turning element.

[0019] Another embodiment of the present invention is that the connecting device has a dome cap.

[0020] Here, the dome cap forms the pressure-resistant end of the tubular fiber composite structure. Such a tubular fiber composite structure with a dome cap is advantageously suitable for use as a pressure tank. The forces acting on the fiber composite structure by internal pressure or external pressure can be transmitted to the connecting device with the dome cap through the long fibers and the fiber turning element.

[0021] Another embodiment of the present invention is that the fiber composite structure has a gasket.

[0022] To ensure the tightness of the pressure tank made of a tubular fiber composite structure against the discharge or entry of media (such as H2) from the outside, the tubular fiber composite structure and the connecting device can be provided with a gasket. The gasket can be applied to the tubular fiber composite structure internally or externally according to the pressure direction. The gasket can be a thermoplastic gasket, such as HDPE or PA. The gasket can also be made of glass, silicone resin or metal. Advantageously, even when intermediate fiber breaks occur in the fiber composite structure, the media tightness of the fiber composite structure is ensured by the gasket.

[0023] The internal gasket can be combined with the dome cap to form a blank for manufacturing an internal pressure tank. In this way, additional cores are avoided during manufacturing. The gasket that is later connected to the dome cap in a media-tight manner can be placed under overpressure during the manufacturing process in order to thus be used as a core for winding the tubular fiber composite structure. Here, the magnitude of the pressure can be adapted to the corresponding requirements. The additional stabilization of the blank (gasket and dome cap) during manufacturing can be achieved by immersing the gasket in a stabilizing medium (polystyrene, sand, hollow spheres, etc.) until the fabric structure of the tank is stable.

[0024] Another embodiment of the present invention is that a plurality of tubular fiber composite structures are interconnected by the connecting device.

[0025] Here, a structure with multiple pressure vessels is formed. Here, the connecting device can be configured as a connecting piece between the pressure vessels. Here, a structure composed of modular tank units can be used to better utilize the installation space in, for example, H2 pressure vessels in vehicle manufacturing. Here, the modular pressure vessels can be oriented in different arrangements. Multiple pressure vessels can be arranged, for example, parallel to each other side by side. Alternatively, multiple pressure vessels with liquid H2 can be arranged, for example, in one pressure vessel with gaseous H2.

[0026] According to another embodiment of the present invention, it is specified that the gasket is applied to the tubular fiber composite structure internally or externally according to the pressure direction.

[0027] One embodiment of the present invention is that the gasket serves as a core for winding the tubular fiber composite structure.

[0028] Finally, belonging to the present invention is that multiple tubular fiber composite structures are interconnected in a manner of being combined into subgroups. Brief Description of the Drawings

[0029] Subsequently, embodiments of the device for applications according to the present invention are explained in detail with reference to the accompanying drawings.

[0030] In the drawings:

[0031] Figure 1 A cross-sectional view of a fiber composite connection section for an application according to the present invention is shown,

[0032] Figure 2 A cross-sectional view of another fiber composite connection section for an application according to the present invention is shown,

[0033] Figure 3 Shown according to Figure 2 Another cross-sectional view of a fiber composite connection section for an application according to the present invention,

[0034] Figure 4 A cross-sectional view of another fiber composite connection section for an application according to the present invention is shown,

[0035] Figure 5 A cross-sectional view of another fiber composite connection section for an application according to the present invention is shown,

[0036] Figure 6 A cross-sectional view of another fiber composite connection section for an application according to the present invention is shown,

[0037] Figure 7 A perspective cross-sectional view of another fiber composite connection section for an application according to the present invention is shown,

[0038] Figure 8 Perspective view of an arrangement of a pressure vessel with a fibre composite connection section according to the invention

[0039] Figure 9 Perspective view of another arrangement of a pressure vessel with a fibre composite connection section according to the invention

[0040] Figure 10 Perspective cross-sectional view of another arrangement of a pressure vessel with a fibre composite connection section according to the invention DETAILED DESCRIPTION

[0041] Figure 1 Cross-sectional view of a section of an embodiment of the connection section 210, which is engaged with a mating connection device 260. The connection section can in particular also have another section in the same cross-sectional plane when it is configured as tubular. Preferably, this embodiment and the embodiments described below are used in a tubular connection section 210. In this embodiment, the long fibres 201a, 202a and 203a do not completely surround the fibre deflection elements 211, 212 and 213, and the long fibres are respectively assigned to the fibre deflection elements. More precisely, the long fibres 201a, 202a and 203a extend along surface sections 221, 222 or 223 of the fibre deflection elements 211, 212 and 213, and the surface sections 221, 222 or 223 at least partially form the outer surface of the connection section 210. The surface sections 221, 222 or 223 extend at an angle of approximately 45°, varying between 20° and 60°, from the direction in which the sections of the long fibres 201a, 202a and 203a extending towards the connection section 210 have. These sections are shown Figure 1 on the left side of the connection section 210. The long fibres 201a and 202a also extend along a section on an adjacent fibre deflection element 212 or 213, and the sections 201 and 202 of the long fibres on the fibre deflection element 212 or 213 change the direction of the long fibres. After the direction change, the long fibres extend along the surface 221 or 222 of the fibre deflection element 211 or 212. Due to the fibre direction change, the outer surfaces 221, 222 or 223 of the fibre deflection elements 211, 212 and 213 can be understood as fibre deflection sections for the fibres. With regard to the long fibres 201a and 202a, since the fibres 201a and 202a extend along a curved surface, the correspondingly adjacent fibre deflection elements 212 and 213 also fulfil the function of a fibre deflection section. Preferably, the connection section 210 includes three fibre deflection elements 211, 212 and 213 in the shown cross-sectional view, since these fibre deflection elements provide sufficient force transmission for many cases. However, the number can also vary

[0042] The long fibers 201a, 202a, and 203a and, correspondingly, one-third of the sections 201, 202, and 203 of the long fibers are formed by longitudinal threads and two-thirds by circumferential layers.

[0043] The fiber turning elements 211, 212, and 213 each have a protruding tip 231, 232, or 233 in the direction towards the connecting device 260. In this embodiment, the long fibers 201a, 202a, and 203a reach up to the tips 231, 232, or 233 to the greatest extent. The long fibers 201a, 202a, 203a do not significantly change their direction once again after they are turned onto the fiber turning elements 211, 212, or 213. The surfaces 221, 222, or 223 along which the long fibers 201a, 202a, and 203a respectively extend are implemented at least approximately flat in at least the section up to near the tips 231, 232, or 233. These flat surfaces 221, 222, or 223 are respectively on the other side of the tips 231, 232, or 233 and, after a preferably 90° turn, transition into a respective other surface 241, 242, or 243 which extends from the tips 231, 232, or 233 respectively in the direction towards the inside of the connecting section 210. At the ends of these surfaces 241, 242, or 243 there are respectively provided notches 251, 252, or 253, after which the outer surface of the connecting section 210 continues in the next fiber turning element, as long as this fiber turning element is not the last fiber turning element 211. The two surfaces in contact on the tips 231, 232, or 233 are as in Figure 1The V-shaped recess is configured as shown. Preferably, the two surfaces form the sides of an equilateral triangle. The long fibers 201a, 202a, and 203a are preferably embedded in the outer surfaces of the fiber turning elements 211, 212, or 213. The fiber turning elements 211, 212, or 213 are each made of a fiber composite material, and the fibers in the fiber turning elements 211, 212, or 213 extend at least approximately orthogonally to the viewing plane. In the case where the connecting section is implemented tubularly, the tensile or compressive force acting on the connecting section is converted into a circumferential force in the fibers of the fiber turning elements 211, 212, or 213, and the circumferential force is received as a longitudinal stress. In this way, the introduced force can be well absorbed. This can be achieved in such a way that, with respect to the tensile force in the long fibers 201a, 202a, or 203a, the surfaces 221, 222, or 223 having the long fibers 201a, 202a, 203a are inclined with respect to the force introduction direction into the connecting section 210. The corresponding situation also applies to the surfaces 241, 242, or 243, i.e., the surfaces opposite to the tips 231, 232, or 233, which press against the connecting device 260 when pressure is introduced into the connecting section 210. The pressure is also converted into a circumferential force by the inclined arrangement of the surfaces 241, 242, or 243, and this circumferential force is received as a tensile force by the fiber turning elements 211, 212, or 213. This effect is particularly well achieved when the surfaces 221, 222, 223, 241, 242, or 243 are arranged inclined with respect to the force introduction direction as just described. The fiber turning elements 211, 212, or 213 preferably have the same cross-section. The fiber turning elements 211, 212, or 213 can be implemented as independent fiber turning elements 211, 212, or 213. Alternatively, the fiber turning elements 211, 212, or 213 can be implemented as a helical, integral fiber turning element 218. Then, the connecting section is implemented tubularly. In this case, a threaded outer surface or inner surface of the connecting section 210 is produced by the surfaces 221, 222, 223, 241, 242, or 243 and the tips 231, 232, or 233. The fiber turning elements 211, 212, and 213 are arranged successively along a straight line in the Figure 1 cross-sectional view shown in

[0044] The connecting device 260 includes a support structure 261 on which an engaging section 262 is fixed. The engaging section is complementary in shape to the outer surface of the connecting device 260. The sections of the flat surfaces 221, 222, 223, 241, 242 or 243 of the engaging section 262 that point to the connecting section 210 are also implemented to be flat and equally inclined to the force-introducing direction. In this way, a form-fit is achieved in the state where the connecting section 210 is fixed to the connecting device 260. The connecting device 260 tapers towards its free end. Here, the side of the support structure 261 facing away from the connecting section 210 is inclined, thereby creating a taper.

[0045] Preferably, the connecting section 210 and the connecting device 260 are implemented as separate elements for a material-free locking connection. However, in the case of transmitting torsional forces, it may be meaningful to bond the connecting section 210 to the connecting device 260. Preferably, at least one fiber layer is then implemented as a +45° layer with respect to the connecting section 210. If the fiber-steering member 218 is helically configured and there is a threaded connection between the connecting section 210 and the connecting device 260, torque can be transmitted in the position on the thread stop along the thread-tightening direction without the need for bonding.

[0046] Figure 2 and Figure 3 A cross-sectional view showing a second embodiment is presented. The second embodiment corresponds to most of the first embodiment. The same features are denoted by the same reference numerals. Only the differences between the first embodiment and the second embodiment will be discussed subsequently.

[0047] The difference between the second embodiment and the first embodiment is that the long fibers 201a, 202a and 203a extend beyond the tips 231, 232 or 233 and further extend in the inclined, flat surfaces 241, 242 or 243. The long fibers are placed into the surfaces 241, 242 or 243. The long fibers terminate at the ends of the surfaces 241, 242 or 243 in the direction towards the notches 251, 252 or 253 or in the vicinity thereof. Additional advantages are produced compared to the first embodiment: The long fibers 201a, 202a and 203a are more firmly connected to the fiber-steering elements 211, 212 or 213. In addition, the surfaces 241, 242 or 243 are more firm due to the additional fibers and can transmit higher pressures to the connecting device 260.

[0048] As in Figure 3As shown in the partial view therein, one third of the long fibers 201a, 202a, and 203a and correspondingly the sections 201, 202, and 203 of the long fibers are composed of longitudinal lines and two thirds are composed of circumferential layers. Here, the circumferential layers also extend beyond the tips 231, 232, or 233. In the tubular design of the connecting section 210, the circumferential layer completely surrounds the cylindrical section of the connecting device 260.

[0049] Figure 4 A cross-sectional view showing a third embodiment of the connecting section 210 and the connecting device 260. The third embodiment corresponds to most of the second embodiment. The same features are denoted by the same reference numerals. Subsequently, only the differences between the second embodiment and the third embodiment will be discussed.

[0050] The difference between the third embodiment and the second embodiment is that the long fibers 201a, 202a, and 203a and correspondingly the sections 201, 202, and 203 of the long fibers are completely composed of longitudinal lines. An additional long fiber 204a that is completely wound around the long fibers 201a, 202a, and 203 is provided on the outer surface of the connecting section 210. This long fiber 204a is completely composed of a circumferential layer. In this way, the circumferential layer is separated from the longitudinal layer.

[0051] Figure 6 A cross-sectional view showing a fourth embodiment of the connecting section 210 and the connecting device 260. The fourth embodiment corresponds to most of the second embodiment. The same features are denoted by the same reference numerals. Subsequently, only the differences between the second embodiment and the fourth embodiment will be discussed.

[0052] The difference between the fourth embodiment and the second embodiment is another fiber turning element 214 on the connecting section 210. This another fiber turning element is provided in the continuation of a series of fiber turning elements 211, 212, and 213 in the direction away from the free end of the connecting section 210. However, this another fiber turning element is different from the other fiber turning elements 211, 212, and 213 in that no long fibers 201a, 202a, and 203a are placed in this another fiber turning element, and the connecting section 210 is connected to a member not explicitly shown by means of the long fibers. However, in the fiber turning element 214, when the connecting section 210 is tubularly implemented, the fibers are placed in the circumferential direction so that the fiber turning element can better receive the turning force from the long fiber 203a. The force from the long fiber is converted into a circumferential force through the annular shape. Thereby, the strength of the connection is increased.

[0053] Another difference is that the connecting device 260 in the fourth embodiment is implemented to extend in the direction away from its free end. The extended support section 261a of the support structure 261 continues the tapered portion, which is inFigure 1 and Figure 2 2 is shown at the free end of the support structure 261. The support extension section 261a rests on the likewise additional bearing section 262a of the engagement section 262 for the additional fiber deflection element 214 in the direction of the connecting section 210. The additional bearing section 262a has an inclined, flat surface, which in the fixed state rests on the likewise inclined surface of the additional fiber deflection element 214. This is similar to the surface of the connecting device, which is complementary in shape to the force transmission surfaces 221, 241, 222, 242, 223, 243 of the connecting section 210. By extending the connecting device 260, its continued tapered portion and the additional fiber deflection element 214, a supporting but still somewhat flexible transition is provided between the force-transmitting long fibers 201a, 202a and 203a and the remaining connecting section 210 for force transmission without the insertion of long fibers for the introduction of force into the connecting section. As a result, the long fibers 203 a are loaded evenly.

[0054] Figure 6 A cross-sectional view of a fifth embodiment of a connecting section is shown. The fifth embodiment corresponds to most of the fourth embodiment. Identical features are denoted by the same reference numerals. Only the differences between the fifth embodiment and the fourth embodiment are discussed subsequently.

[0055] The fifth embodiment differs from the fourth embodiment in that the connecting section 210 additionally has a supporting layer 215 between the fiber deflecting element 214 and the fiber layer 203a. The free end of the supporting layer 215 facing away from the connecting section 210 extends beyond the additional fiber deflecting element 214. The supporting layer 215 further compensates for the stresses in the connecting section 210, so that the connecting section can be loaded without too high a material consumption for the supporting layer 215.

[0056] In addition, the fifth embodiment differs from the fourth embodiment in that the long fibers 201a, 202a and 203a are also Figure 1 As in the first embodiment shown, the long fibers 201a, 202a and 203a may be further guided into the second inclined surface 241, 242 or 243 without exceeding the tip 231, 232 or 23. Figure 7 However, as in the sixth embodiment shown, it is also guided further into the surface 241, 242 or 243, which provides the advantages of this difference, which are related to Figure 2 Given above.

[0057] Figure 7 A perspective view of a sixth embodiment of a connecting section 210 having a tubular design is shown. Reference numerals for identical features correspond to those in the other figures.

[0058] In Figure 8 the arrangement of three pressure vessels 1 is shown. The pressure vessel 1 is a tubular fiber composite structure which is connected via a connecting device at one of its ends and has a dome cap 2 at the other end.

[0059] In Figure 9 the arrangement of thirty-three pressure vessels 1 is shown. The pressure vessel 1 is a tubular fiber composite structure which is connected via a connecting device at one of its ends and has a dome cap 2 at the other end. The pressure vessels 1 are combined into subgroups of three corresponding pressure vessels 1 each. Each subgroup is connected to the other subgroups respectively.

[0060] In Figure 10 a pressure vessel 1 for cryogenic applications is shown. The pressure vessel 1 is designed as a double-walled tank which has seven cryogenic inner tanks 4, for example for liquid H2 and gaseous H2 in the outer tank 3. If the temperature of the cryogenic content, for example H2, is higher than 20 K, a part of the content must be purged in order to re-cool the remaining content. This purging can be carried out from the inner tank 4 into the outer tank 3 and is further available there as gaseous H2.

Claims

1. Application of a fiber composite connection section (210) for connecting a tubular fiber composite structure to a connection device (260), the fiber composite structure having more circumferential layers than longitudinal threads, the connection section (210) having at least one fiber deflection element (211, 212, 213) inside it, the extension direction of the long fibers (201a, 202a, 203a) of the fiber composite member following the shape of the fiber deflection section of the fiber deflection element (211, 212, 213) such that the fiber direction of the long fibers is deflected on the fiber deflection section, and the long fibers (201a, 202a, 203a) do not completely wrap around the fiber deflection element (211, 212, 213), the long fibers being respectively assigned to the fiber deflection element, wherein, The fiber steering elements (211, 212, 213) are made of fiber composite material, and there is no fixed connection between the tubular fiber composite structure and the connecting device (260) for the pressure vessel (1).

2. The application according to claim 1, wherein The fiber composite material of the fiber steering elements (211, 212, 213) mainly consists of circumferential layers.

3. The application according to claim 1 or 2, characterized in that, The connecting device (260) has a vault cap (2).

4. The application according to any one of the above claims, characterized in that The fiber composite structure has a gasket.

5. The application according to claim 4, wherein The gasket is applied to the tubular fiber composite structure internally or externally according to the pressure direction.

6. The application according to claim 4, characterized in that The gasket serves as a core for winding the tubular fiber composite structure.

7. The application according to any one of the above claims, characterized in that, A plurality of tubular fiber composite structures are interconnected by the connecting device (260).

8. The application according to any one of the above claims, characterized in that, A plurality of tubular fiber composite structures are interconnected in a manner of being combined into subgroups.

Images