Head reinforcement device and reinforcement method for hydrogen storage container used in 99MPa-level hydrogen refueling station

Abstract

The present invention discloses a head reinforcement device and reinforcement method for a hydrogen storage container for a 99MPa-level hydrogen refueling station. The head reinforcement device includes a positioning sleeve, a transition retaining ring and an adjusting bolt, wherein the transition retaining ring can be accurately positioned by the positioning sleeve and the adjusting bolt, and the working surface of the transition retaining ring provides a contour limit for the reinforcement winding. It ensures a smooth transition of the composite reinforcement layer after the head position is filled, and can avoid stress concentration. In the specific reinforcement operation, the polyester fiber felt and the axial carbon fiber tape are laid on the lining and then the carbon fiber winding is performed, and the polyester fiber felt is turned over and wrapped and then wound with glass fiber for curing. The composite reinforcement layer of the arc transition section of the bottle shoulder and the straight section of the cylinder are connected into a whole, and the reinforcement effect of the smooth transition of the head position can be achieved, while effectively preventing electrochemical corrosion; it also provides protection for the composite reinforcement layer as a whole to prevent water seepage into the composite reinforcement layer.

Description

Technical Field

[0001] The present invention relates to a production strengthening technology for a large-volume high-pressure gas storage container, and in particular to a head reinforcement device and a reinforcement method for a hydrogen storage container used in a 99MPa-level hydrogen refueling station. Background Art

[0002] At present, with the technological breakthrough of hydrogen energy, hydrogen storage containers are developing towards large volume and high pressure.

[0003] High-pressure hydrogen storage is the main hydrogen storage method in hydrogen refueling stations. It is divided into two categories according to the hydrogen filling pressure: 35MPa and 70MPa. Most of the hydrogen refueling stations in use and under construction in China are 35MPa. The general design pressure of hydrogen storage containers is 50MPa. The structure of hydrogen storage containers is made of single-layer spun seamless steel pipe.

[0004] The design pressure of domestic 70MPa-level station hydrogen storage containers is generally 87.5MPa, 98MPa, and 103MPa. Stainless steel multi-layer wrapped containers are usually used, such as steel belt staggered winding and layer plate wrapping types. There are also explorations into the use of single-layer spun seamless steel pipe manufacturing and steel-lined carbon fiber full spiral winding structures.

[0005] The stainless steel multi-layer wrapping and welding forming manufacturing method has problems such as low degree of mechanical automation and low product quality consistency, and the batch production efficiency is low;

[0006] If a single-layer spun seamless steel tube is used to spin and manufacture a 100MPa hydrogen storage container, the container volume and the load-bearing capacity need to be increased, and the wall thickness of the designed container will be very thick, which brings a series of technical difficulties. The first technical bottleneck encountered is the homogeneity problem in the rolling process of large-volume seamless steel tubes. The heat treatment equipment and process cannot fully guarantee the full hardening in the thickness direction of the cylinder, resulting in too fast crack expansion in the hydrogen environment, which is very likely to cause hydrogen embrittlement. The hot spinning process of the spinning equipment is more difficult, so this structure poses a greater challenge to the processing capabilities of large equipment.

[0007] While fully spirally winding steel-lined fiber eliminates material and process issues with the steel lining, fully winding large-volume hydrogen storage vessels requires extensive equipment, and winding a 500L-1000L vessel takes over six hours, making it highly inefficient. This prolonged winding time can also lead to improper curing of the resin system during the winding process, impacting product quality.

[0008] Moreover, the existing production process is not specially designed, and a single circumferential winding cannot reinforce the head. When the winding reaches a certain thickness, serious slippage and collapse will occur at the transition position. Even if there is still a small amount of carbon fiber envelope after curing, it cannot effectively share the load; it not only affects the appearance, but also fails to achieve the reinforcement effect of the smooth transition position. Summary of the Invention

[0009] The purpose of the present invention is to propose a head reinforcement device and reinforcement method for a 99MPa-level hydrogen storage container for a hydrogen refueling station, aiming to efficiently manufacture a single hoop-wound hydrogen storage container with a volume of more than 500L and a design pressure of 99MPa while ensuring the safety of the high-pressure hydrogen storage container.

[0010] The technical solution of the present invention to achieve one of the above purposes is that the head reinforcement device of the hydrogen storage container for 99MPa-level hydrogen refueling station is used in conjunction with the lining of the container and is equipped with a set at each end of the lining, wherein the positioning sleeve is prefabricated into a hollow funnel composed of a large ring, a small ring and a plurality of support ribs, and the small ring is detachably positioned and attached to the bottle mouth of the liner, and the large ring is parallel to the small ring through the support ribs and has more than three through-holes distributed on the surface of the large ring; the working surface on the inner side of the transition retaining ring is set as an inner concave arc surface matching the winding thickness, and the inner concave arc surface makes the composite reinforcement layer filled in the head position transition smoothly, and the surface of the transition retaining ring facing the positioning sleeve is distributed with a screw hole coaxially aligned with the through-hole; the adjusting bolt extends into the through-hole and is tightened in the screw hole.

[0011] Furthermore, the bottle mouth of the liner is provided with an external thread, the inner side of the small ring is provided with an internal thread, and the positioning sleeve is positioned on the bottle mouth by screwing the small ring.

[0012] Furthermore, it also includes a positioning nut sleeved on the external thread. When the positioning sleeve is installed in place, the positioning nut abuts against the small ring from the outside to prevent it from retreating.

[0013] Furthermore, four through holes are provided and are located on orthogonal axes within the radial plane of the large ring, and the number and positioning of the screw holes refer to the through holes.

[0014] Another technical solution of the present invention to achieve the above-mentioned purpose is a head reinforcement method for a 99MPa-class hydrogen storage container for a hydrogen refueling station, which lays an axial carbon fiber tape at the head to connect the composite reinforcement layer of the arc transition section of the bottle shoulder and the straight section of the cylinder into a whole, including the following steps:

[0015] S1, install the aforementioned head reinforcement device, first sleeve a transition ring made of polytetrafluoroethylene on both ends of the container, then install a positioning sleeve to adjust the positioning, and the transition ring is limited by the positioning sleeve for slight movement;

[0016] S2: Apply glue to the inner lining surface between the transition rings on both sides and lay polyester fiber felt around it, leaving a margin when cutting after laying;

[0017] S3, laying carbon fiber tapes at the weak position of the liner shoulder in parallel with the axial direction and circumferential distribution requirements;

[0018] S4, install the adjusting bolts to ensure that the transition ring is installed in place and is coaxial with the liner and tangent to the surface of the arc transition section of the bottle shoulder;

[0019] S5, attaching the remaining amount of polyester fiber felt in S2 to the working surface of the transition retaining ring, and leading the end of the polyester fiber felt to the outside;

[0020] S6, performing subsequent carbon fiber winding, during which several layers of carbon fiber unidirectional cloth are added to the straight section of the cylinder, and the wound carbon fiber is thickened by setting a 180° dwell angle at the shoulder of the head, and the carbon fiber at the edge position slides slightly toward the working surface of the transition retaining ring while maintaining the winding tension, and is densely filled;

[0021] S7, completely apply the end of the polyester fiber felt led out of S5 to the composite reinforcement layer at the head position, apply glue, and flatten and stick it tightly;

[0022] S8, then wrapping a glass fiber protective layer on the straight section of the cylinder, and the winding position is sufficient to wrap and press the end of the applied polyester fiber felt at the head position.

[0023] S9, after curing is completed, the head reinforcement device is removed and the finished product is demoulded and separated.

[0024] Furthermore, the position for laying the carbon fiber tape in S3 is from the straight section of the cylinder at a distance of 90 mm to 110 mm from the bottle shoulder to the end of the winding position of the composite reinforcement layer.

[0025] Furthermore, before S1, the step also includes applying a release agent to the working surface of the transition retaining ring and air-drying it, and repeating the same operation three times.

[0026] The application of the head reinforcement device and reinforcement method of the present invention has the following technical effects compared with the existing technology: the present invention can accurately control the position of the transition retaining ring by fixing it with a positioning sleeve and adjusting bolts, and the working surface of the transition retaining ring is designed with an arc size to ensure a smooth transition of the composite reinforcement layer after the head position is filled, thereby avoiding stress concentration.

[0027] At the same time, the laid polyester fiber felt is led out from the bottom layer to cover the composite reinforcement layer of the head reinforcement, and combined with the compression effect of the outermost layer of glass fiber, it can avoid the exposure of carbon fiber, completely isolate the carbon fiber and the lining, and effectively prevent electrochemical corrosion; it also provides protection for the entire composite reinforcement layer to prevent water seepage into the composite reinforcement layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the installation structure of the head reinforcement device of the present invention.

[0029] Figure 2It is a structural schematic diagram of the present invention after the head reinforcement is completed but the reinforcing device is not disassembled.

[0030] Figure 3 It is a schematic diagram of the three-dimensional structure of the positioning sleeve in the head reinforcement device of the present invention.

[0031] Figure 4 It is a schematic axial cross-sectional view of the transition retaining ring in the head reinforcement device of the present invention.

[0032] Figure 5 It is a schematic axial cross-sectional view of the reinforced finished product of the present invention.

[0033] Figure 6 yes Figure 5 Schematic diagram of the enlarged layered structure of part A. DETAILED DESCRIPTION

[0034] The specific implementation methods of the present invention will be further described below in conjunction with the accompanying drawings to make the technical solutions of the present invention easier to understand and grasp, thereby making a clearer definition of the protection scope of the present invention.

[0035] The present invention innovatively proposes a head reinforcement device and reinforcement method for a 99MPa-level hydrogen storage container for hydrogen refueling stations, aiming to efficiently manufacture a single hoop-wound hydrogen storage container with a volume of more than 500L and a design pressure of 99MPa while ensuring the safety of the high-pressure hydrogen storage container.

[0036] First, if Figures 1 to 4 As shown in the hardware components of the head reinforcement device for a 99MPa-class hydrogen storage container at a hydrogen refueling station, it is primarily used in conjunction with the container's inner liner 4, with one set installed at each end of the inner liner. Each set of the head reinforcement device includes a positioning sleeve 1, a transition retaining ring 2, and an adjusting bolt 3. The positioning sleeve 1 is prefabricated into a hollow funnel consisting of a large ring 11, a small ring 12, and several ribs 13. The small ring 12 is removably positioned and attached to the inner liner bottle mouth 41. The large ring 11 is parallel to the small ring 12 via the ribs 13, and the large ring surface is provided with three or more perforations 14. The positioning sleeve is preferably made of a high-rigidity metal material to ensure reliable support for the transition retaining ring during the winding operation and prevent it from falling out. The working surface 21 inside the transition retaining ring 2 is designed as a concave arc surface that matches the winding thickness. The concave arc surface is sized to allow for a smooth transition to the composite reinforcement layer filled at the head. The transition retaining ring 2 is also provided with a screw hole 22 coaxially aligned with the through hole 14 on the side facing the positioning sleeve 1. Simultaneously, the adjusting bolt 3 is inserted into the through hole 14 and tightened in the screw hole 22.

[0037] The above-described scheme can be further refined and optimized as follows. Considering the installation and fixation method of the head reinforcement (also known as a wrapping and positioning fixture), the liner bottle mouth 41 is provided with external threads (not shown), and the matching dimensions are taken into consideration during processing. The inner side of the small ring 12 is provided with internal threads, so the positioning sleeve 1 can be screwed onto the bottle mouth via the small ring. Furthermore, to ensure the installation stability of the positioning sleeve, a positioning nut is included, which is sleeved onto the external threads. When the positioning sleeve is in place, the positioning nut can be pressed against the small ring from the outside to prevent it from retreating.

[0038] In the preferred embodiment shown in the figures, four through-holes 12 are provided and located on orthogonal axes within the radial plane of the large ring 11 , and the number and positioning of the screw holes 22 are similar to those of the through-holes 12 .

[0039] Secondly, the 99MPa-class hydrogen refueling station uses a head reinforcement method for hydrogen storage containers. An axial carbon fiber tape is laid at the head to connect the composite reinforcement layer of the arc transition section of the bottle shoulder and the straight section of the cylinder into a whole. In addition, with the winding positioning tool, the weak position of the cylinder straight section and the arc transition section of the bottle shoulder is reinforced by circumferential winding. Figure 5 and Figure 6 The refinement steps shown are detailed below.

[0040] S1, install the above-mentioned head reinforcement device, first put a transition ring made of polytetrafluoroethylene on both ends of the container, and then install the positioning sleeve to adjust the positioning. The transition ring is limited by the slight movement of the positioning sleeve to facilitate the laying and tape laying operations. The transition ring is designed in size, and the arc size is calculated and designed according to the thickness of the winding layer to ensure a smooth transition of the reinforcement layer after the head position is filled to avoid stress concentration. In addition, this workpiece is made of polytetrafluoroethylene material for two purposes: first, it takes advantage of the high temperature resistance, chemical resistance, high lubricity and non-stick properties of polytetrafluoroethylene to meet the use scenarios and facilitate demolding. Second, it is made of plastic, which is softer and lighter than metal parts, and can avoid damage to the surface coating of the lining at the contact part.

[0041] S2, apply glue on the inner lining surface between the transition retaining rings on both sides and lay polyester fiber felt around it, and leave a margin when cutting after laying; this is for the subsequent pasting into the transition retaining ring to cover and protect the reinforcement layer at the head reinforcement position.

[0042] S3: Carbon fiber tape is laid parallel to the axial direction and distributed circumferentially at the weak point of the liner shoulder. The purpose is to connect the arc transition section and the straight section of the cylinder, making them a tighter integrated structure and preventing the reinforcement layer of the arc transition section from separating from the straight section of the cylinder.

[0043] S4, install the adjusting bolts to ensure that the transition ring is installed in place and is coaxial with the liner and tangent to the surface of the arc transition section of the bottle shoulder.

[0044] S5, stick the remaining amount of polyester fiber felt in S2 onto the working surface of the transition retaining ring, and lead the end of the polyester fiber felt to the outside.

[0045] S6, subsequent carbon fiber winding is performed. During the process, several layers of carbon fiber unidirectional cloth are added to the straight section of the cylinder. The wound carbon fiber is thickened at a 180° dwell angle at the bottle head shoulder. Under the premise of maintaining the winding tension, the carbon fiber at the edge position slides slightly toward the working surface of the transition retaining ring and is densely filled.

[0046] S7: Completely attach the end of the polyester fiber felt led out of S5 to the composite reinforcement layer at the head position, apply glue, and flatten and attach it tightly.

[0047] S8, then wrapping a glass fiber protective layer on the straight section of the cylinder, and the winding position is sufficient to wrap and press the end of the applied polyester fiber felt at the head position.

[0048] S9, after curing is completed, the head reinforcement device is removed and the finished product is demoulded and separated.

[0049] More specifically, the position for laying the carbon fiber tape in the above S3 is from the straight section of the cylinder at a distance of 90 mm to 110 mm from the bottle shoulder to the end of the winding position of the composite reinforcement layer.

[0050] In addition, before S1, the working surface of the transition retaining ring is coated with a release agent and air-dried, and the same operation is repeated three times.

[0051] From the above detailed description of the embodiment of the head reinforcement device and reinforcement method for the hydrogen storage container for the 99MPa-level hydrogen refueling station of the present invention, it can be seen that the present solution has outstanding substantial characteristics and significant progress: First, the present invention can accurately control the position of the transition retaining ring by fixing it with a positioning sleeve and adjusting the bolts, and the working surface of the transition retaining ring is designed with an arc size to ensure a smooth transition of the composite reinforcement layer after the head position is filled, thereby avoiding stress concentration.

[0052] Furthermore, the present invention uses a laid polyester fiber felt that is led out from the bottom layer to cover the composite reinforcement layer for head reinforcement, and then cooperates with the compression effect of the outermost layer of glass fiber to avoid exposure of carbon fiber, completely isolate the carbon fiber and the lining, and effectively prevent electrochemical corrosion; it also provides protection for the entire composite reinforcement layer to prevent water seepage into the composite reinforcement layer.

[0053] In addition to the above embodiments, the present invention may also have other implementation methods. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

The head reinforcement device for hydrogen storage containers used in 1.99MPa hydrogen refueling stations is used in conjunction with the container's liner, with one set installed at each end of the liner. It is used to reinforce the weak position of the transition section between the straight section of the cylinder and the arc section of the bottle shoulder by a circumferential winding operation. It is removed after the reinforcement is completed. It is characterized by: The head reinforcement device includes a positioning sleeve, a transition retaining ring and an adjusting bolt, wherein the positioning sleeve is prefabricated into a hollow funnel composed of a large ring, a small ring and a plurality of ribs, the small ring is detachably positioned and attached to the liner bottle mouth, the large ring is parallel to the small ring through the ribs and has more than three perforations distributed on the surface of the large ring; The working surface on the inner side of the transition retaining ring is set as an inner concave arc surface that matches the winding thickness, and the inner concave arc surface makes the composite reinforcement layer filled in the head position transition smoothly. The surface of the transition retaining ring facing the positioning sleeve is distributed with screw holes coaxially aligned with the through holes. The adjusting bolt extends into the through hole and is tightened in the screw hole.

2. The head reinforcement device for a 99MPa-grade hydrogen storage container for a hydrogen refueling station according to claim 1, characterized in that: The bottle mouth of the liner is provided with an external thread, the inner side of the small ring is provided with an internal thread, and the positioning sleeve is screwed and positioned on the bottle mouth through the small ring.

3. The head reinforcement device for a 99MPa-grade hydrogen storage container for a hydrogen refueling station according to claim 2, characterized in that: It also includes a positioning nut sleeved on the external thread. When the positioning sleeve is installed in place, the positioning nut abuts against the small ring from the outside to prevent it from retreating.

4. The head reinforcement device for a 99 MPa-grade hydrogen storage container for a hydrogen refueling station according to claim 1, characterized in that: There are four through holes, which are located on orthogonal axes in the radial plane of the large ring. The number and positioning of the screw holes refer to the through holes. A method for reinforcing the head of a hydrogen storage container for a 5.99MPa-grade hydrogen refueling station is characterized by: Laying an axial carbon fiber tape at the head to connect the composite reinforcement layer of the arc transition section of the bottle shoulder and the straight section of the cylinder into a whole, including the following steps: S1, install the head reinforcement device described in claim 1, first sleeve a transition ring made of polytetrafluoroethylene on both ends of the container, then install a positioning sleeve to adjust the positioning, and the transition ring is limited by the positioning sleeve to slightly move; S2: Apply glue to the inner lining surface between the transition rings on both sides and lay polyester fiber felt around it, leaving a margin when cutting after laying; S3, laying carbon fiber tapes at the weak position of the liner shoulder in parallel with the axial direction and circumferential distribution requirements; S4, install the adjusting bolts to ensure that the transition ring is installed in place and is coaxial with the liner and tangent to the surface of the arc transition section of the bottle shoulder; S5, attaching the remaining amount of polyester fiber felt in S2 to the working surface of the transition retaining ring, and leading the end of the polyester fiber felt to the outside; S6, performing subsequent carbon fiber winding, during which several layers of carbon fiber unidirectional cloth are added to the straight section of the cylinder, and the wound carbon fiber is thickened by setting a 180° dwell angle at the shoulder of the head, and the carbon fiber at the edge position slides slightly toward the working surface of the transition retaining ring while maintaining the winding tension, and is densely filled; S7, completely apply the end of the polyester fiber felt led out of S5 to the composite reinforcement layer at the head position, apply glue, and flatten and stick it tightly; S8, then wrapping a glass fiber protective layer on the straight section of the cylinder, and the winding position is sufficient to wrap and press the end of the applied polyester fiber felt at the head position; S9, after curing is completed, the head reinforcement device is removed and the finished product is demoulded and separated.

6. The head reinforcement method for a 99 MPa-grade hydrogen storage container for a hydrogen refueling station according to claim 5, characterized in that: In S3, the carbon fiber tape is laid from the straight section of the cylinder at a distance of 90 mm to 110 mm from the bottle shoulder to the end of the winding position of the composite reinforcement layer.

7. The head reinforcement method for a 99 MPa-grade hydrogen storage container for a hydrogen refueling station according to claim 5, characterized in that: Before S1, the process also includes applying a release agent to the working surface of the transition retaining ring and air-drying it, and repeating the same operation three times.

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