Lightweight hydrogen storage bottle based on honeycomb-shaped supporting structure

Abstract

The utility model discloses a lightweight hydrogen storage bottle based on a honeycomb-shaped supporting structure, belongs to the field of hydrogen storage containers, and aims to solve the problems of large supporting cross section area and poor stability in the prior art. The light-weight hydrogen storage bottle comprises an inner container, an outer container and a supporting piece, a first fixing seat is fixedly mounted on the inner wall of the inner container; a second fixing seat is fixedly mounted on the outer container; the supporting piece comprises a supporting part and two connecting parts which are integrally formed, the two connecting parts are located at the two ends of the supporting part respectively, and the size of the cross section, perpendicular to the length direction, of each connecting part is gradually reduced in the direction towards the supporting part and is larger than the size of the cross section, perpendicular to the length direction, of the supporting part. The two supporting parts are fixedly connected with the first fixing seat and the second fixing seat respectively; uniformly distributed hexagonal holes are formed in the cross sections, perpendicular to the length direction, of the supporting part and the connecting part to form a honeycomb structure, the hexagonal holes of the supporting part are smaller than the hexagonal holes of the connecting part in size, and the distances between the hexagonal holes are the same.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hydrogen storage containers, in particular to a lightweight hydrogen storage cylinder based on a honeycomb support structure. BACKGROUND

[0002] The lightweight hydrogen storage cylinder based on a honeycomb support structure, as a core component of a liquid hydrogen fuel cell vehicle, needs to meet the stringent requirements of lightweight, high strength and thermal insulation performance. Currently, the vehicle-mounted lightweight hydrogen storage cylinder based on a honeycomb support structure mostly adopts a double-layer vacuum insulation structure, and the inner and outer containers are connected by an annular tubular support structure, such as the support structure for the lightweight hydrogen storage cylinder based on a honeycomb support structure disclosed in Chinese Patent CN221171778U, which connects the inner and outer containers by a glass tube. However, this lightweight hydrogen storage cylinder based on a honeycomb support structure has the following defects:

[0003] Firstly, since the circular tube is a hollow structure, in order to ensure sufficient shear resistance and compression resistance, the diameter and cross section of the circular tube are usually large, resulting in large space occupation; secondly, the critical buckling safety factor of the circular tube structure is low, and it is prone to instability during long-term use.

[0004] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0005] (I) Technical problems solved

[0006] The embodiment of the present application provides a lightweight hydrogen storage cylinder based on a honeycomb support structure, which can solve the problems of large support cross-sectional area and poor stability in the prior art.

[0007] (II) Technical solutions

[0008] To solve the above technical problems, the present application provides the following technical solutions:

[0009] A lightweight hydrogen storage cylinder based on a honeycomb support structure is provided, which comprises an inner container, an outer container and a support member.

[0010] The inner container is arranged inside the outer container, and a first fixing seat is fixedly installed on the inner wall thereof; the outer container is fixedly installed with a second fixing seat;

[0011] The support piece comprises a support part and two connecting parts, the support part and the two connecting parts are integrally formed, and the two connecting parts are respectively located at two ends of the support part, the size of the cross section perpendicular to the length direction of the connecting part gradually decreases in the direction towards the support part, and is greater than the size of the cross section perpendicular to the length direction of the support part, and the two support parts are respectively fixedly connected with the first fixing seat and the second fixing seat;

[0012] The support part and the connecting part are provided with a plurality of hexagonal holes uniformly distributed on the cross section perpendicular to the length direction, and form a honeycomb structure, the size of the hexagonal hole of the support part is smaller than that of the connecting part, and the hole spacing of the hexagonal hole of the support part is the same as that of the connecting part.

[0013] In some embodiments, the hexagonal hole extends along the length direction in the connecting part and the support part, forming a table-shaped structure or a hexagonal columnar structure with a cross section of hexagon; the number of hexagonal holes of the connecting part and the support part is the same, and the positions of the hexagonal holes are opposite in the cross section perpendicular to the length direction, so that the opposite hexagonal holes are communicated with each other.

[0014] In some embodiments, the first fixing seat is provided with a first support cavity, and a first support plate is arranged on the side of the first support cavity away from the outer container, the connecting part connected with the first fixing seat is embedded in the first support cavity, and the end of the connecting part away from the outer container is welded with the first support plate.

[0015] In some embodiments, the inner container is provided with a gap hole for the connecting part to pass through at the opposite position of the first fixing seat, and an epoxy glass cold insulation layer is arranged in the first support cavity, the outer side of the epoxy glass cold insulation layer is closely combined with the first fixing seat, and the gap hole is sealed.

[0016] In some embodiments, the second fixing seat is provided with a second support cavity, and a second support plate is arranged on the side of the second support cavity away from the inner container, the connecting part connected with the second fixing seat is embedded in the second support cavity, and the end of the connecting part away from the inner container is welded with the second support plate.

[0017] In some embodiments, the shape of the support part is columnar structure.

[0018] In some embodiments, the shape of the cross section perpendicular to the length direction of the connecting part is hexagonal or circular.

[0019] In some embodiments, an insulating layer is arranged between the outer container and the inner container.

[0020] (Three) beneficial effects

[0021] Compared with the prior art, the technical scheme provided by the embodiment of the application has at least the following beneficial effects:

[0022] The light-weight hydrogen storage bottle based on the honeycomb support structure in the application connects the inner container and the outer container through the support, the support is connected with the inner container and the outer container through two connecting parts respectively, the support part and the connecting part are both provided with uniformly distributed hexagonal holes in the cross section perpendicular to the length direction, and the size of the hexagonal hole of the support part is smaller than that of the connecting part, but the hole spacing is the same, so that the honeycomb support structure with different densities is formed. Compared with the traditional circular tube support structure, the honeycomb support structure in the application can provide more reliable support under the condition that the pipe diameter or cross section is the same, or reduce the pipe diameter or cross section under the condition that the support capacity is the same, so as to realize light weight; at the same time, the honeycomb support structure in the application improves the critical buckling safety factor, has higher buckling resistance under the action of the same external force, and further guarantees the use safety and stability of the light-weight hydrogen storage bottle based on the honeycomb support structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 is a schematic view of the cross section of the light-weight hydrogen storage bottle based on the honeycomb support structure in the embodiment of the application;

[0025] Figure 2 is a schematic view of the cross section of the light-weight hydrogen storage bottle based on the honeycomb support structure in the embodiment of the application; Figure 1 is a schematic view of the A area in the embodiment of the application;

[0026] Figure 3 is a schematic view of the support body in the embodiment of the application;

[0027] Figure 4 is a schematic view of the change trend of the single hexagonal hole of the support in the embodiment of the application;

[0028] Figure 5 is a schematic view of the cross section of the support in the embodiment of the application.

[0029] Reference signs:

[0030] The inner container 1, the first fixing seat 11, the let-out hole 12, the first support cavity 111, the first support plate 112, and the epoxy glass cold insulation layer 113;

[0031] The outer container 2, the second fixing seat 21, the second support cavity 211, and the second support plate 212;

[0032] Support 3, support part 31, connecting part 32, gradient connecting ring 33, hexagonal hole 310;

[0033] Thermal insulation layer 4; length direction L; hole spacing W.

[0034] The specific embodiments of the present application have been shown in the above drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] In order to make the purposes, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] The existing light-weight hydrogen storage bottle based on a honeycomb support structure is connected between the inner liner and the outer liner through an annular tubular support structure. Such light-weight hydrogen storage bottle based on a honeycomb support structure has the following defects: first, in order to ensure that the circular tube has sufficient shear resistance and pressure resistance, the diameter and cross section of the circular tube are usually large; at the same time, the critical buckling safety factor of the circular tube structure is low, and it is easy to lose stability during long-term use.

[0038] To solve the above technical problems, the present embodiment provides a light-weight hydrogen storage bottle based on a honeycomb support structure. Figure 1 is a schematic view of the cross section of the light-weight hydrogen storage bottle based on a honeycomb support structure in the embodiments of the present application, Figure 2 is Figure 1 is a schematic view of the A area, Figure 3 is a schematic view of the support body in the embodiments of the present application, Figure 4 is a schematic view of the variation trend of the single hexagonal hole of the support in the embodiments of the present application, Figure 5 is a schematic view of the cross section of the support in the embodiments of the present application.

[0039] The light-weight hydrogen storage bottle based on a honeycomb support structure comprises an inner container 1, an outer container 2 and a support 3.

[0040] The inner container 1 is arranged inside the outer container 2, and a first fixing seat 11 is fixedly installed on the inner wall of the inner container 1; the outer container 2 is fixedly installed with a second fixing seat 21.

[0041] The support 3 comprises a support part 31 and two connecting parts 32, the support part 31 is integrally formed with the two connecting parts 32, and the two connecting parts 32 are respectively located at both ends of the support part 31, the size of the connecting part 32 in the cross section perpendicular to the length direction gradually decreases in the direction towards the support part 31, and is greater than the size of the support part 31 in the cross section perpendicular to the length direction, and the two support parts 31 are respectively fixedly connected with the first fixed seat 11 and the second fixed seat 21.

[0042] The support part 31 and the connecting part 32 are both provided with a plurality of hexagonal holes 310 uniformly distributed in the cross section perpendicular to the length direction, and form a honeycomb structure, the size of the hexagonal hole 311 of the support part 31 is smaller than that of the hexagonal hole 321 of the connecting part 32, and the hole spacing W of the hexagonal hole 311 of the support part 31 is the same as the hole spacing W of the hexagonal hole 321 of the connecting part 32. That is, the hexagonal hole 310 extends along the length direction L in the connecting part 32 and the support part 31, and the size of the hole gradually decreases from the two ends to the middle part. At the same time, the support 3 is composed of periodically arranged regular hexagonal units.

[0043] For example, the unit length is 12 mm, the unit gap is 1-3 mm, the material is glass steel or carbon fiber composite material, and the fiber volume content is greater than or equal to 55%.

[0044] In some embodiments, the size of the support part 31 in the cross section perpendicular to the length direction L gradually decreases in the direction towards the connecting part 32, and is greater than the size of the connecting part 32 in the cross section perpendicular to the length direction L, so as to form a three-stage density gradient design of connecting part 32-support part 31-connecting part 32, or a gradient connecting ring 33, the fiber volume content gradually decreases from 60% at the end face of the connecting part 32 to 45% at the support part 31, and the unit size gradually decreases from 20 mm to 12 mm, and the support part 31 serves as a transition zone, and the length thereof is adjusted according to the distance between the inner container and the outer container, for example, 10 mm.

[0045] For example, the size of the support part 31 in the cross section perpendicular to the length direction L gradually decreases in the direction towards the connecting part 32, the unit size of the gradient connecting ring 33 gradually changes at a ratio of 1:0.6, the length of each transition zone is 3-4 mm, and the fiber volume content of each stage decreases by 5%. The gradual change design prolongs the heat conduction path and weakens the heat bridge effect. At the same time, by adjusting the fiber ratio, the content gradually reduces the thermal conductivity, and the heat stress concentration at the interface is avoided.

[0046] In some embodiments, the hexagonal holes 310 extend along the length direction L in both the connecting part 32 and the supporting part 31, forming a table-like structure or a hexagonal columnar structure with a hexagonal cross section, which not only enhances the strength of the supporting part 3, but also helps to reduce the weight; at the same time, the number of hexagonal holes 321, 311 of the connecting part 32 and the supporting part 31 remains consistent, and the positions are opposite in the cross section perpendicular to the length direction L, ensuring that the positionally opposite hexagonal holes 310 are in communication with each other in three-dimensional space, thereby helping to improve the overall stability of the structure and the heat conduction performance of the lightweight hydrogen storage bottle based on the honeycomb supporting structure.

[0047] In an embodiment in which the connecting part 32 is fixedly connected with the first fixing seat 11, the first fixing seat 11 is provided with a first supporting cavity 111, and a first supporting plate 112 is arranged on the side of the first supporting cavity 111 away from the outer container 2. The connecting part 32 connected with the first fixing seat 11 is embedded in the first supporting cavity 111, and the end thereof away from the outer container 2 is welded with the first supporting plate 112. Such arrangement ensures the stable installation of the connecting part 32, and helps to improve the sealing performance of the lightweight hydrogen storage bottle based on the honeycomb supporting structure.

[0048] Further, the inner container 1 is provided with a gap hole 12 at the opposite position of the first fixing seat 11 for the connecting part 32 to pass through, and the first supporting cavity 111 is provided with an epoxy glass cold insulation layer 113. The outer side of the epoxy glass cold insulation layer 113 is tightly attached to the first fixing seat 11 and seals the gap hole 12. Since the inner container 1 stores low-temperature liquid hydrogen, the epoxy glass cold insulation layer 113 cooperates with the glass steel material of the gradient connecting ring to effectively reduce the risk of hydrogen embrittlement.

[0049] In some embodiments, the outside of the connecting part 32 and the supporting part 31 at the connection is wrapped by the epoxy glass cold insulation layer 113 or supported by the cavity wall of the second supporting cavity 211, thereby reducing the influence of stress concentration at the connection on the structural stability and improving the stress resistance of the connection.

[0050] In an embodiment in which the connecting part 32 is fixedly connected with the second fixing seat 21, the second fixing seat 21 is provided with a second supporting cavity 211, and a second supporting plate 212 is arranged on the side of the second supporting cavity 211 away from the inner container 1. The connecting part 32 connected with the second fixing seat 21 is embedded in the second supporting cavity 211, and the end thereof away from the inner container 1 is welded with the second supporting plate 212.

[0051] For example, the first fixing seat 11 and the second fixing seat 21 are fixedly connected with the inner container 1 and the outer container 2, respectively, by welding.

[0052] In some embodiments, the support part 31 has a columnar structure. The columnar structure not only enhances the strength of the support part 31, but also helps to reduce the weight and improve the overall performance of the lightweight hydrogen storage bottle based on the honeycomb support structure.

[0053] In some embodiments, the connecting part 32 has a hexagonal or circular cross-sectional shape perpendicular to the length direction L, which can be adjusted according to actual needs to meet different application scenarios and performance requirements.

[0054] In some embodiments, an insulating layer 4 is provided between the outer container 2 and the inner container 1. The insulating layer 4 effectively prevents heat transfer, improves the heat preservation effect of the lightweight hydrogen storage bottle based on the honeycomb support structure, and ensures the long-term storage stability of liquid hydrogen.

[0055] For example, the insulating layer 4 is composed of alternating layers of aluminized coating film 41 and nylon mesh 42, with a layer number ≥ 30, a vacuum degree ≤ 1 × 10-3 Pa, and a thickness of each aluminized coating film 41 layer of 6-12 μm, and a mesh number of the nylon mesh 42 of 80-120.

[0056] The lightweight hydrogen storage bottle based on the honeycomb support structure of the present application connects the inner container 1 and the outer container 2 through the support part 3, which is connected to the inner and outer containers through two connecting parts 32, and the support part 31 and the connecting part 32 are both provided with uniformly distributed hexagonal holes 310 in the cross section perpendicular to the length direction L. At the same time, the size of the hexagonal hole 311 of the support part 31 is smaller than that of the hexagonal hole 321 of the connecting part 32, but the hole spacing W is the same, thus forming a honeycomb support structure with different densities. Compared with the traditional circular tube support structure, the honeycomb support structure of the present application can provide more reliable support under the same pipe diameter or cross-sectional area, or reduce the pipe diameter or cross-sectional area under the same support capacity, achieving lightweight. At the same time, the honeycomb support structure of the present application improves the critical buckling safety factor and has higher buckling resistance under the same external force, further ensuring the safety and stability of the lightweight hydrogen storage bottle based on the honeycomb support structure.

[0057] In summary, the light-weight hydrogen storage cylinder based on the honeycomb support structure disclosed in the present application replaces the traditional circular tube support structure with a regular hexagonal honeycomb support structure through bionic topological optimization design, and realizes stress homogenization in combination with a gradient connecting ring. Meanwhile, through collaborative design of the 3-level gradient connecting ring and the homogeneous honeycomb unit, the support cross-sectional area is reduced, the buckling safety factor is improved, the peak stress is reduced, and the light-weight hydrogen storage cylinder based on the honeycomb support structure is suitable for vehicle-mounted and aviation liquid hydrogen storage and transportation systems. It should be noted that the gradient connecting ring is an important innovation point of the present application. The gradient connecting ring gradually changes the hole diameter and material density to "digest" the concentrated pressure little by little, thereby avoiding stress concentration. The fiber content of the connecting part 32 is high, and the density is small, while the fiber content of the middle support part 31 is small but the density is large. Such a gradual change structure can effectively reduce the risk of brittle fracture of the welding points. The overall effect is like a shock-absorbing spring of a car. The middle of the spring is a uniform coil (honeycomb structure), and the coils at both ends gradually change in density (gradient connecting ring), so that the spring and the frame are connected more smoothly, and the vibration impact is reduced.

[0058] The above only describes optional embodiments of the present application and does not limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lightweight hydrogen storage cylinder based on a cellular support structure, characterized by, Include: Inner container, outer container and support; The inner container is arranged in the inner part of the outer container, and the inner wall of the inner container is fixedly installed with a first fixing seat; the outer container is fixedly installed with a second fixing seat; The support includes a support part and two connecting parts, the support part and the two connecting parts are integrally formed, and the two connecting parts are located at the two ends of the support part respectively, the size of the cross section perpendicular to the length direction of the connecting part gradually decreases in the direction towards the support part, and is greater than the size of the cross section perpendicular to the length direction of the support part, the two support parts are fixedly connected with the first fixing seat and the second fixing seat respectively; Wherein, the support part and the connecting part are provided with a plurality of hexagonal holes uniformly distributed on the cross section perpendicular to the length direction, and form a honeycomb structure, the size of the hexagonal hole of the support part is smaller than that of the connecting part, and the hole spacing of the hexagonal hole of the support part is the same as that of the connecting part.

2. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to claim 1, characterized in that, The hexagonal hole extends along the length direction in the connecting part and the support part, forming a table-like structure or a hexagonal columnar structure with a hexagonal cross section; The number of hexagonal holes of the connecting part and the support part is the same, and the positions of the hexagonal holes are opposite on the cross section perpendicular to the length direction, so that the opposite hexagonal holes are connected with each other.

3. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to claim 1, characterized in that, The first fixing seat is provided with a first support cavity, and a first support plate is arranged on the side of the first support cavity away from the outer container, the connecting part connected with the first fixing seat is embedded in the first support cavity, and the end away from the outer container is welded with the first support plate.

4. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to claim 3, characterized in that, The inner container is provided with a gap hole for the connecting part to pass through at the opposite position of the first fixing seat, and the first support cavity is provided with an epoxy glass cold insulation layer, the outer side of the epoxy glass cold insulation layer is closely combined with the first fixing seat, and the gap hole is sealed.

5. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to claim 1, wherein, The second fixing seat is provided with a second support cavity, and a second support plate is arranged on the side of the second support cavity away from the inner container, the connecting part connected with the second fixing seat is embedded in the second support cavity, and the end away from the inner container is welded with the second support plate.

6. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to claim 1, wherein, The outer shape of the support part is columnar structure.

7. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to claim 1, wherein, The cross section shape of the connecting part perpendicular to the length direction is hexagonal or circular.

8. The light-weight hydrogen storage cylinder based on a honeycomb support structure according to any one of claims 1 to 7, characterized in that An insulating layer is arranged between the outer container and the inner container.

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