Carbon fiber winding hydrogen storage cylinder

Abstract

This utility model provides a carbon fiber wound hydrogen storage cylinder, including an inner liner, a carbon fiber wound layer outside the inner liner, and a fixing structure located at the cylinder opening of the inner liner and wrapping the inner liner and the carbon fiber wound layer. The fixing structure includes an inner locking ring, a connecting end, an outer locking ring, and a clamping clamp. One end of the inner locking ring is detachably connected to the inside of the inner liner cylinder opening, and the other end is located outside the inner liner cylinder opening and connected to one end of the connecting end. A valve body connector is detachably connected inside the inner locking ring. The inner side of the outer locking ring is attached to the carbon fiber wound layer and connected to the other end of the connecting end. An annular fastening groove is provided on the outer side of the outer locking ring, and the clamping clamp is located in the annular fastening groove. The inner liner and the carbon fiber layer can be wrapped without damaging the carbon fiber layer structure, solving the technical problems in the prior art where threaded holes and bolts are required on the inner liner and the carbon fiber layer for fastening, which weakens the mechanical properties of the carbon fiber layer, reduces the overall pressure resistance, shortens the service life of the cylinder, and poses a risk of safety accidents.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen storage cylinder technology, and in particular to a carbon fiber wound hydrogen storage cylinder. Background Technology

[0002] Hydrogen storage cylinders, as core equipment for hydrogen energy storage, can be classified into Type I to Type IV based on differences in materials and structures. Currently, the mainstream products are mainly Type III (metal liner fully wrapped with carbon fiber reinforcement) and Type IV (polymer liner fully wrapped with carbon fiber reinforcement), both of which significantly reduce cylinder weight through the high specific strength characteristics of carbon fiber composite materials. However, due to differences in material properties between metal and carbon fiber, and between polymer and carbon fiber (such as mismatched coefficients of thermal expansion and insufficient interfacial bonding strength), gas leakage problems can easily occur at the cylinder opening due to assembly stress or changes in ambient temperature, seriously affecting the safety and reliability of hydrogen storage.

[0003] Chinese patent application CN202422336297.0 discloses a carbon fiber wound composite gas cylinder, which uses a bonding layer to wrap the inner liner and the carbon fiber layer, and is fixed by multiple circumferentially arranged fastening bolts. Although this solution can effectively prevent gas leakage, it has the following drawbacks: First, the bolt installation requires drilling holes in the carbon fiber wound layer for positioning, which disrupts the fiber continuity and weakens the local mechanical properties; second, the uneven stress distribution in the contact area between the bolt head and the carbon fiber layer forms stress concentration points, which can easily induce fatigue crack propagation under long-term high-pressure conditions, resulting in a decrease in the overall pressure resistance of the carbon fiber layer. This not only shortens the service life of the gas cylinder, but also poses a risk of safety accidents. Utility Model Content

[0004] The purpose of this application is to provide a carbon fiber wound hydrogen storage cylinder to solve the technical problems in the prior art, which require multiple threaded holes to be opened in the circumferential direction of the inner liner and the carbon fiber layer, and the fixing layer to be fastened to the inner liner and the carbon fiber layer by bolts, resulting in weakened mechanical properties of the carbon fiber layer, reduced overall pressure resistance, shortened cylinder service life, and risk of safety accidents.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] A carbon fiber wound hydrogen storage cylinder includes an inner liner, a carbon fiber wound layer, a fixing structure, and a valve body connector. The carbon fiber wound layer is connected to the outside of the inner liner. The fixing structure is connected to the bottle opening of the inner liner and covers the inner liner and the carbon fiber wound layer. The valve body connector is connected to the fixing structure. The fixing structure includes an inner locking ring, a connecting end, an outer locking ring, and a clamping clamp.

[0007] One end of the inner locking ring is located inside the bottle opening of the inner liner and is detachably connected to the inner liner. The other end of the inner locking ring is located outside the bottle opening of the inner liner and is connected to one end of the connecting end. The inner side of the outer locking ring is attached to the carbon fiber winding layer and is connected to the other end of the connecting end. An annular fastening groove is provided on the outer side of the outer locking ring. The clamping clamp is provided in the annular fastening groove to provide radial clamping force to the outer locking ring. The valve body connector is detachably connected to the inner side of the inner locking ring and abuts against the connecting end.

[0008] In the carbon fiber wound hydrogen storage cylinder described in this application embodiment, the inner locking ring, the connecting end, and the outer locking ring are integrally formed.

[0009] In a carbon fiber wound hydrogen storage cylinder according to an embodiment of this application, the inner liner is provided with a first internal thread on the inner side of the bottle opening, and the inner locking ring is provided with a first external thread adapted to the first internal thread at one end of the inner liner located on the inner side of the bottle opening. The inner locking ring and the inner liner are detachably connected through the first internal thread and the first external thread.

[0010] In a carbon fiber wound hydrogen storage cylinder according to an embodiment of this application, a first annular limiting groove is provided at the bottle mouth of the inner liner, a first sealing ring is provided in the first annular limiting groove, and a first annular protrusion is provided on the side of the connecting end near the inner liner.

[0011] In a carbon fiber wound hydrogen storage cylinder described in this application embodiment, the groove depth of the first annular limiting groove is defined as H1, the thickness of the first sealing ring is H2, and the height of the first annular protrusion is H3. Then, H1, H2, and H3 satisfy H3+H2>H1.

[0012] In a carbon fiber wound hydrogen storage cylinder according to an embodiment of this application, the inner side of the inner locking ring is provided with a second internal thread, the valve body connector is provided with a second external thread, and the valve body connector and the inner locking ring are detachably connected through the second internal thread and the second external thread.

[0013] In a carbon fiber wound hydrogen storage cylinder described in this application embodiment, a second annular limiting groove is provided at the end of the connecting end away from the inner liner, a second sealing ring is provided in the second annular limiting groove, and a second annular protrusion is provided at the end of the valve body connector that abuts against the connecting end.

[0014] In a carbon fiber wound hydrogen storage cylinder described in this application embodiment, the groove depth of the second annular limiting groove is defined as L1, the thickness of the second sealing ring is defined as L2, and the height of the second annular protrusion is defined as L3. Then, L1, L2, and L3 satisfy L3+L2>L1.

[0015] In a carbon fiber wound hydrogen storage cylinder described in this application embodiment, a rubber layer is provided between the outer locking ring and the carbon fiber wound layer.

[0016] In a carbon fiber wound hydrogen storage cylinder described in this application embodiment, there are two annular fastening grooves, and each annular fastening groove is provided with a clamping clamp.

[0017] Compared with the prior art, the embodiments of this application have the following beneficial effects:

[0018] As can be seen from the above technical solution, the carbon fiber wound hydrogen storage cylinder provided in this application embodiment wraps the inner liner and carbon fiber wound layer by setting an outer locking ring, a connecting end, and an inner locking ring. By setting an annular fastening groove on the outer locking ring, and setting a clamping clamp in the annular fastening groove to provide an inward radial clamping force to the outer locking ring, and combining it with the valve body connecting part connected to the inner side of the inner locking ring, an outward radial extrusion force is provided to the inner locking ring. This allows the fixed structure to tightly wrap the inner liner and carbon fiber wound layer without damaging the integrity of the carbon fiber wound layer. This solves the technical problems in the prior art that require multiple threaded holes to be opened in the circumferential direction of the inner liner and carbon fiber layer, and the fixed layer to be fastened to the inner liner and carbon fiber layer with bolts, which weakens the mechanical properties of the carbon fiber layer, reduces the overall pressure resistance, shortens the service life of the gas cylinder, and poses a risk of safety accidents. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The drawings are not intended to be drawn to scale, and for clarity, not every component will be labeled in each drawing. The drawings described below are merely some embodiments of this application. Those skilled in the art can obtain other drawings based on these drawings without creative effort. Wherein:

[0020] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0021] Figure 2 for Figure 1 A magnified view of part A in the diagram.

[0022] Figure 3 for Figure 1 A magnified view of part B in the diagram.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Inner liner, 2-Carbon fiber winding layer, 3-Valve body connector, 4-Inner locking ring, 5-Connecting end, 6-Outer locking ring, 7-Clamping clamp, 8-Annular fastening groove, 9-First internal thread, 10-First external thread, 11-First annular limiting groove, 12-First sealing ring, 13-First annular protrusion, 14-Second internal thread, 15-Second external thread, 16-Second annular limiting groove, 17-Second sealing ring, 18-Second annular protrusion, 19-Rubber layer. Detailed Implementation

[0025] The existing technology involves creating multiple threaded holes in the circumferential direction of the fixing layer, carbon fiber layer, and inner liner, and then using bolts to fasten the fixing layer to the carbon fiber layer and the inner liner. This results in weakened mechanical properties of the carbon fiber layer, reduced overall pressure resistance, shortened cylinder lifespan, and the risk of safety accidents.

[0026] In view of this, this application provides a carbon fiber wound hydrogen storage cylinder. The concept is to wrap the inner liner and the carbon fiber wound layer by setting an outer locking ring, a connecting end, and an inner locking ring. An annular fastening groove is set on the outer locking ring, and a clamping hoop is set in the annular fastening groove to provide an inward radial clamping force to the outer locking ring. Combined with the valve body connector connected to the inner side of the inner locking ring, an outward radial compressive force is provided to the inner locking ring. This allows the fixing structure to tightly wrap the inner liner and the carbon fiber wound layer without damaging the integrity of the carbon fiber wound layer. This solves the technical problems in the prior art, which requires multiple threaded holes to be opened in the circumferential direction of the inner liner and the carbon fiber layer, and the fixing layer to be fastened to the inner liner and the carbon fiber layer with bolts, resulting in weakened mechanical properties of the carbon fiber layer, reduced overall pressure resistance, shortened cylinder service life, and the risk of safety accidents.

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0032] This application provides a carbon fiber wound hydrogen storage cylinder, such as... Figures 1 to 3 As shown. A carbon fiber wound hydrogen storage cylinder includes an inner liner 1, a carbon fiber wound layer 2, a fixing structure, and a valve body connector 3. The carbon fiber wound layer 2 is connected to the outside of the inner liner 1. The fixing structure is connected to the bottle opening of the inner liner 1 and covers the inner liner 1 and the carbon fiber wound layer 2. The valve body connector 3 is connected to the fixing structure.

[0033] The fixed connection structure includes an inner locking ring 4, a connecting end 5, an outer locking ring 6, and a clamping clamp 7.

[0034] In this embodiment, the inner locking ring 4, the connecting end 5, and the outer locking ring 6 are integrally formed.

[0035] One end of the inner locking ring 4 is located inside the bottle opening of the inner liner 1 and is detachably connected to the inner liner 1.

[0036] Specifically, the inner liner 1 has a first internal thread 9 on the inner side of the bottle opening, and the inner locking ring 4 has a first external thread 10 that is adapted to the first internal thread 9 at one end of the inner liner 1 located on the inner side of the bottle opening. The inner locking ring 4 and the inner liner 1 are detachably connected through the first internal thread 9 and the first external thread 10.

[0037] The other end of the inner locking ring 4 is located outside the bottle opening of the inner liner 1 and is connected to one end of the connecting end 5. The inner side of the outer locking ring 6 is attached to the carbon fiber winding layer 2 and is connected to the other end of the connecting end 5.

[0038] It should be noted that, in some preferred embodiments, a first annular limiting groove 11 is provided at the bottle mouth of the inner liner 1, a first sealing ring 12 is provided in the first annular limiting groove 11, and a first annular protrusion 13 is provided on the side of the connecting end 5 near the inner liner 1. The groove width of the first annular limiting groove 11 is equal to the width of the first annular protrusion 13. The groove depth of the first annular limiting groove 11 is defined as H1, the thickness of the first sealing ring 12 is defined as H2, and the height of the first annular protrusion 13 is defined as H3. Then, H1, H2, and H3 satisfy H3 + H2 > H1. In this embodiment, the sum of H3 and H2 is slightly greater than H1.

[0039] During assembly of the fixing structure, the fixing structure is wrapped around the inner liner 1 and the carbon fiber winding layer 2 at the bottle opening of the inner liner 1 by the first internal thread 9 and the first external thread 10. As the inner locking ring 4 is screwed into the bottle opening of the inner liner 1, the first annular protrusion 13 moves toward the first annular limiting groove 11, squeezing the first sealing ring 12. This not only provides radial limiting for the fixing structure, but also improves the airtightness between the fixing structure and the inner liner 1 and the carbon fiber winding layer 2, further preventing hydrogen gas in the inner liner 1 from leaking from the connection between the fixing structure and the inner liner 1 and the carbon fiber winding layer 2.

[0040] An annular fastening groove 8 is provided on the outer side of the outer locking ring 6, and the clamping clamp 7 is disposed in the annular fastening groove 8 to provide radial clamping force to the outer locking ring 6.

[0041] Specifically, there are two annular fastening grooves 8, and each annular fastening groove 8 is provided with a clamping clamp 7.

[0042] In this embodiment, one end of the outer locking ring 6 away from the connecting end 5 is configured as an arc surface structure to fit the carbon fiber winding layer 2. In this embodiment, one of the annular fastening grooves 8 is disposed in the middle of the outer locking ring 6, and the other annular fastening groove 8 is disposed at the end of the outer locking ring 6 away from the connecting end 5, and is located at the end of the arc surface segment close to the connecting end 5.

[0043] The valve body connector 3 is detachably connected to the inner side of the inner locking ring 4 and abuts against the connecting end 5.

[0044] Specifically, the inner locking ring 4 is provided with a second internal thread 14 on its inner side, and the valve body connector 3 is provided with a second external thread 15. The valve body connector 3 and the inner locking ring 4 are detachably connected through the second internal thread 14 and the second external thread 15.

[0045] It should be noted that, in some preferred embodiments, a second annular limiting groove 16 is provided at the end of the connecting end 5 away from the inner liner 1, and a second sealing ring 17 is provided in the second annular limiting groove 16. A second annular protrusion 18 is provided at the end of the valve body connector 3 that abuts against the connecting end 5. The groove width of the second annular limiting groove 16 is equal to the width of the second annular protrusion 18. The groove depth of the second annular limiting groove 16 is defined as L1, the thickness of the second sealing ring 17 is defined as L2, and the height of the second annular protrusion 18 is defined as L3. Then, L1, L2, and L3 satisfy L3 + L2 > L1. In this embodiment, the sum of L3 and L2 is slightly greater than L1.

[0046] During assembly of the valve body connector 3, the valve body connector 3 is screwed into the inner locking ring 4 through the second internal thread 14 and the second external thread 15. As the valve body connector 3 is screwed into the inner locking ring 4, the second annular protrusion 18 moves toward the second annular limiting groove 16, compressing the second sealing ring 17. This not only provides radial limiting for the valve body connector 3, but also improves the sealing between the valve body connector 3 and the fixed structure, further preventing hydrogen gas in the inner liner 1 from leaking from the connection between the fixed structure and the valve body connector 3.

[0047] In some preferred embodiments, a rubber layer 19 is provided between the outer locking ring 6 and the carbon fiber winding layer 2.

[0048] Considering the difference in surface flatness between the outer locking ring 6 and the carbon fiber winding layer 2, resulting in a small gap on the contact surface, a rubber layer 19 is provided. Utilizing the elastic properties of the rubber layer 19, when the clamping clamp 7 applies radial pressure to the outer locking ring 6, the rubber layer 19 deforms and spontaneously fills the small gap, allowing the pressure of the outer locking ring 6 to be better transmitted to the carbon fiber winding layer 2, thereby improving the covering effect of the fixing structure on the inner liner 1 and the carbon fiber winding layer 2.

[0049] In summary, the carbon fiber wound hydrogen storage cylinder provided in this application embodiment achieves wrapping of the inner liner and carbon fiber wound layer by setting an outer locking ring, a connecting end, and an inner locking ring. An annular fastening groove is provided on the outer locking ring, and a clamping clamp within the annular fastening groove provides an inward radial clamping force to the outer locking ring. Combined with a valve body connector connected to the inner side of the inner locking ring, an outward radial compressive force is provided to the inner locking ring. This allows the fixing structure to tightly wrap around the inner liner and carbon fiber wound layer without damaging the integrity of the carbon fiber wound layer. This solves the technical problems in the prior art where multiple threaded holes need to be opened circumferentially on the inner liner and carbon fiber layer, and the fixing layer is fastened to the inner liner and carbon fiber layer with bolts, resulting in weakened mechanical properties of the carbon fiber layer, reduced overall pressure resistance, shortened cylinder lifespan, and the risk of safety accidents.

[0050] The foregoing has provided a detailed description of a carbon fiber wound hydrogen storage cylinder provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A carbon fiber wound hydrogen storage cylinder, comprising an inner liner, a carbon fiber wound layer, a fixing structure, and a valve body connector, wherein the carbon fiber wound layer is connected to the outside of the inner liner, the fixing structure is connected to the cylinder opening of the inner liner and forms a covering over the inner liner and the carbon fiber wound layer, and the valve body connector is connected to the fixing structure, characterized in that... The fixed connection structure includes an inner locking ring, a connecting end, an outer locking ring, and a clamping clamp. One end of the inner locking ring is located inside the bottle opening of the inner liner and is detachably connected to the inner liner. The other end of the inner locking ring is located outside the bottle opening of the inner liner and is connected to one end of the connecting end. The inner side of the outer locking ring is attached to the carbon fiber winding layer and is connected to the other end of the connecting end. An annular fastening groove is provided on the outer side of the outer locking ring. The clamping clamp is provided in the annular fastening groove to provide radial clamping force to the outer locking ring. The valve body connector is detachably connected to the inner side of the inner locking ring and abuts against the connecting end.

2. The carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, The inner locking ring, the connecting end, and the outer locking ring are integrally formed.

3. The carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, The inner liner has a first internal thread on the inner side of the bottle opening, and the inner locking ring has a first external thread that matches the first internal thread at one end of the inner liner's inner side of the bottle opening. The inner locking ring and the inner liner are detachably connected through the first internal thread and the first external thread.

4. The carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, The inner liner is provided with a first annular limiting groove at the bottle mouth, and a first sealing ring is provided in the first annular limiting groove. The connecting end is provided with a first annular protrusion on the side near the inner liner.

5. A carbon fiber wound hydrogen storage cylinder as described in claim 4, characterized in that, Let H1 be the groove depth of the first annular limiting groove, H2 be the thickness of the first sealing ring, and H3 be the height of the first annular protrusion. Then H1, H2, and H3 satisfy H3+H2>H1.

6. A carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, The inner locking ring has a second internal thread on its inner side, and the valve body connector has a second external thread. The valve body connector and the inner locking ring are detachably connected through the second internal thread and the second external thread.

7. A carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, The end of the connecting end away from the inner liner is provided with a second annular limiting groove, and a second sealing ring is provided in the second annular limiting groove. The end of the valve body connector that abuts against the connecting end is provided with a second annular protrusion.

8. A carbon fiber wound hydrogen storage cylinder as described in claim 7, characterized in that, Let L1 be the groove depth of the second annular limiting groove, L2 be the thickness of the second sealing ring, and L3 be the height of the second annular protrusion. Then L1, L2, and L3 satisfy L3+L2>L1.

9. A carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, A rubber layer is provided between the outer locking ring and the carbon fiber winding layer.

10. A carbon fiber wound hydrogen storage cylinder as described in claim 1, characterized in that, There are two annular fastening grooves, and each annular fastening groove is provided with a clamping hoop.

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