A steel wire winding type hydrogen storage container capable of avoiding stress relaxation and a manufacturing method thereof

Abstract

The present invention relates to hydrogen storage container technology, and aims to provide a wire-wound hydrogen storage container and a manufacturing method that can avoid stress relaxation. The outer part of the inner cylinder of the hydrogen storage container is arranged with circumferentially wound steel wires in a multi-layer spiral winding manner and bonded with resin; the toothed reinforcing hoop includes a reinforcing hoop inner ring, a reinforcing ring plate and a plurality of reinforcing hoop teeth from the inside to the outside; the reinforcing hoop inner ring is bowl-shaped and is sleeved on the outside of the head, and a plurality of reinforcing hoop teeth are arranged on the reinforcing ring plate at equal intervals, and axially wound steel wires are arranged in a reciprocating winding manner between each group of reinforcing hoop teeth and basket bolts are provided. The hydrogen storage container of the present invention strengthens the container by applying a pre-tightening force to the inner cylinder body through the circumferentially wound steel wires and the axially wound steel wires, and uses the basket bolts to adjust the tension of the axially wound steel wires to avoid stress relaxation; thereby reducing the wall thickness of the inner cylinder and the amount of steel used in the winding layer, thereby achieving lightweight container; the inner cylinder force can be flexibly adjusted to effectively reduce the axial stress on the circumferential weld.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen storage containers, and provides a wire-wound hydrogen storage container for avoiding stress relaxation and a manufacturing method thereof. Background Art

[0002] The popularization of hydrogen energy utilization is inseparable from the four key links of production, storage, transportation and use. At present, large-capacity storage of gaseous hydrogen is generally achieved by increasing the volume of the container and increasing the hydrogen storage pressure. Common large-volume containers, such as spherical tanks, are made of materials with low strength and many welds. GB / T 12337-2014 "Steel Spherical Storage Tanks" stipulates that their design pressure shall not exceed 6.4MPa. At present, the pressure of common hydrogen storage spherical tanks is only about 1-6 MPa, which cannot achieve efficient storage of hydrogen.

[0003] Using winding technology to improve the pressure bearing performance of containers has become one of the research directions. For example, Zhejiang University has developed a flat steel strip wound multi-layer high-pressure hydrogen storage container (Zheng Jinyang, Chen Rui, Li Lei, et al. Multifunctional full-layer high-pressure hydrogen storage tank [J]. Pressure Vessel, 2005, (12): 25-28+47.), the inner layer of which uses austenitic stainless steel with good hydrogen embrittlement resistance and low strength, and the outer layer is wound with cheap and easily available flat steel strips. However, due to the limited strength of the steel strip, it is necessary to wrap multiple layers of steel strips to achieve the required preload, resulting in its excessive weight. At the same time, the wound steel strip will cause stress relaxation problems after the container has been running for a long time, and it is difficult to regulate during service. Therefore, higher requirements are placed on the material of the inner cylinder, and austenitic stainless steel with good hydrogen embrittlement resistance but higher price is required. In addition, the currently commonly used high-pressure wound hydrogen storage container manufacturing process requires the use of complex manufacturing equipment, and large-capacity storage containers processed and formed in the factory will bring about the problems of difficulty in long-distance transportation and high transportation costs.

[0004] Therefore, it is necessary to propose new technologies to solve the above technical problems. Summary of the invention

[0005] In order to solve the technical problem and overcome the shortcomings of the prior art, the present invention provides a wire-wound hydrogen storage container and a manufacturing method thereof that avoids stress relaxation.

[0006] To solve the technical problem, the solution of the present invention is:

[0007] Provided is a wire-wound hydrogen storage container capable of avoiding stress relaxation. The main structure of the hydrogen storage container comprises an inner cylinder body and end caps at both ends, wherein the inner cylinder body and the end caps are connected by welding; a toothed reinforcing hoop is respectively mounted on the opposite open ends of the two end caps and fixed by welding; a circumferentially wound steel wire is arranged on the outside of the inner cylinder body in a multi-layer spirally wound manner, and the circumferentially wound steel wires and the circumferentially wound steel wires and the inner cylinder body are bonded by resin;

[0008] The toothed reinforcing hoop is an integral structure formed by forging, comprising an inner ring of the reinforcing hoop, a reinforcing ring plate and a plurality of reinforcing hoop teeth from the inside to the outside; the inner ring of the reinforcing hoop is in a bowl-shaped shape, and has a shape matching the opening end of the head so that the two are closely connected; the reinforcing ring plate is located at the larger opening end of the inner ring of the reinforcing hoop, and a plurality of reinforcing hoop teeth are arranged on the reinforcing ring plate at equal intervals; the two toothed reinforcing hoops are arranged symmetrically, and their reinforcing hoop teeth correspond to each other one by one to form a plurality of combinations; the connecting line of each group of reinforcing hoop teeth is parallel to the axial direction of the inner cylinder body, and axially wound steel wires are arranged between each group of reinforcing hoop teeth in a reciprocating winding manner, and a basket bolt is provided in the middle of each group of axially wound steel wires; the container is strengthened by applying a pre-tightening force to the inner cylinder body by means of the annularly wound steel wire and the axially wound steel wire, and the tensioning force of the axially wound steel wire is adjusted by the basket bolt to avoid stress relaxation.

[0009] As a preferred embodiment of the present invention, the inner cylinder body is composed of one or more cylinder segments; a single cylinder segment is formed by a steel plate through a spiral welding process, and multiple cylinder segments are spliced ​​by ring welding without axial long welds; the length of a single cylinder segment is 5-15m.

[0010] As a preferred solution of the present invention, the head is stamped from a steel plate in the form of a convex head with an elliptical, hemispherical or dish-shaped cross-section; a hole is opened at the center of the head for connecting external pipelines.

[0011] As a preferred embodiment of the present invention, the number of reinforcing hoop teeth on the toothed reinforcing hoop is an even number, and the cross-section of the reinforcing hoop teeth is a trapezoid with a larger outer end and a smaller bottom end; the outer end of the toothed reinforcing hoop is higher than the outermost layer of annularly wound steel wire layer and ensures the space required for winding the axially wound steel wire.

[0012] As a preferred embodiment of the present invention, the basket bolts used to adjust the tension of the axially wound steel wire are symmetrically arranged with the axial direction of the inner cylinder body as the center.

[0013] As a preferred embodiment of the present invention, the inner cylinder body and the head are made of steel with a yield strength range of 600-800MPa; the yield strength of the steel used to manufacture the toothed reinforcement hoop is not less than 325MPa; the diameter of the annularly wound steel wire or the axially wound steel wire is in the millimeter level and has a tensile strength of more than 1000GPa.

[0014] As a preferred solution of the present invention, the inner ring of the reinforcing hoop is coated on the outside of the opening end of the head, the thickness of the inner ring of the reinforcing hoop is not less than the thickness of the head, and the coating angle α is in the range of 30-70°.

[0015] The present invention further provides a method for preparing the aforementioned steel wire wound type hydrogen storage container, comprising:

[0016] (1) The inner cylinder section is manufactured by spiral welding in the factory, the toothed reinforcing hoop is manufactured by forging, and the head is manufactured by stamping;

[0017] (2) The cylinder segments, toothed reinforcing hoops and winding steel wires are transported to the installation site of the hydrogen storage container. After the cylinder segments are connected by on-site welding to form the inner cylinder body, the ends of the cylinder body are welded and the welds are uniformly formed as girth welds;

[0018] (3) Put two toothed reinforcement hoops symmetrically on the heads on both sides of the container, adjust the position and angle of the reinforcement hoops to ensure that the teeth of each reinforcement hoop correspond one to one in space, and then use welding technology to tightly connect the toothed reinforcement hoop and the head;

[0019] (4) First, perform circumferential steel wire winding, and bond the wound steel wires and the steel wires to the cylinder with resin until the cylinder structure is completely covered by the wound steel wires and reaches the designed number of winding layers; then perform axial steel wire winding based on the reinforcement hoop tooth groups at the corresponding positions of the reinforcement hoops on both sides; after each group of winding is completed, change to winding another group of reinforcement hoop teeth in the opposite direction to ensure that the toothed reinforcement hoop is evenly stressed during the winding process until all tooth pairs are wound;

[0020] (5) The ring buckles at both ends of the basket bolt are respectively installed on the two bundles of axially wound steel wires between the single set of reinforcing hoop teeth. The installation position is in the middle of each set of axially wound steel wires, thereby completing the on-site manufacturing of the wire-wound hydrogen storage container.

[0021] During the operation of the hydrogen storage container, the basket bolt can be adjusted in time according to the stress state of the winding steel wire, and the tension of the axial winding steel wire can be adjusted to avoid stress relaxation of the hydrogen storage container.

[0022] As a preferred embodiment of the present invention, the resin used for bonding is a resin that cures under normal temperature and pressure conditions.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention applies a pre-tightening force to the inner cylinder of the container by means of high-strength circumferential and axially wound steel wires, thereby reducing the wall thickness of the inner cylinder and the amount of steel used in the winding layer, thereby achieving lightweight containers. By changing the number of winding layers of the circumferential and axially wound steel wires, the force on the inner cylinder can be flexibly adjusted. At the same time, the force exerted by the axially wound steel wire on the head through the toothed reinforcing hoop can effectively reduce the axial stress on the circumferential weld connecting the head and the cylinder, thereby protecting the circumferential welds between the various cylinder sections and between the cylinder sections and the head.

[0025] 2. The material of the inner tube of the container of the present invention can be selected from conventional high-strength steel instead of traditional 304 austenitic stainless steel, which can reduce the design thickness of the inner tube and the total weight of the container, and is more economical.

[0026] 3. The present invention uses a multi-section cylinder made by spiral welding technology to make the cylinder of the container by ring welding at the installation site of the hydrogen storage container, which fundamentally avoids the introduction of long axial welds in the cylinder. Compared with the traditional high-pressure hydrogen storage container structure and manufacturing method, it has the advantages of short cylinder manufacturing cycle, simple manufacturing process, and high weld safety. In addition, the on-site processing method also solves the problem of difficult and high cost long-distance transportation of large finished containers after leaving the factory.

[0027] 4. The present invention can timely adjust the tension of the axially wound steel wire through the basket bolt after the container has been running for a long period of time, so as to prevent the stress relaxation of the axially wound steel wire caused by the fatigue load of frequent charging and discharging of the container during operation. According to the force balance and triangle similarity principle, the larger the capacity and the longer the container, the greater the tension generated by the basket bolt on the axially wound steel wire, and the tension of the axially wound steel wire can be achieved with a smaller bolt adjustment force. This function of adjusting stress during operation cannot be achieved by traditional steel belt wound containers. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the main view of the container structure;

[0029] Figure 2 This is the left view of the container structure;

[0030] Figure 3 It is a schematic diagram of the structure of the toothed reinforcement hoop;

[0031] Figure 4 It is a schematic diagram of the assembly relationship between the toothed reinforcement hoop and the head.

[0032] The reference numerals in the accompanying drawings are: 1 toothed reinforcing hoop; 2 inner cylinder body; 3 head; 4 circumferentially wound steel wire; 5 basket bolt; 6 axially wound steel wire; 101 reinforcing hoop teeth; 102 reinforcing hoop inner ring; 103 reinforcing ring plate. DETAILED DESCRIPTION

[0033] The following is a detailed description of the wire-wound large-capacity hydrogen storage container and on-site manufacturing method capable of avoiding stress relaxation according to the present invention in conjunction with the accompanying drawings.

[0034] Based on in-depth research, the present invention makes full use of the characteristics of steel wire strength that is significantly improved compared to ordinary container steel plates and adjustable tension, and proposes a design scheme for a large-capacity, lightweight hydrogen storage container with steel wire winding. The present invention prevents relaxation and shares the force on the inner cylinder by timely regulating the tension of the steel wire, thereby reducing the requirements for the hydrogen embrittlement resistance of the inner cylinder, and a higher strength material can be selected. In addition, considering the convenience of on-site manufacturing, the currently commonly used high-pressure winding hydrogen storage container manufacturing process is inseparable from complex manufacturing devices and equipment, while the cylinder body in the present invention is composed of multiple sections of cylinder segments, each of which is efficiently processed by spiral welding in the factory, and the container cylinder can be directly formed by welding after being transported to the site in sections. In the subsequent winding process, since the steel wire winding direction is only circumferential and axial, the requirements for winding equipment are low, on-site processing is convenient, and transportation costs can be effectively reduced.

[0035] 1. Description of container structure:

[0036] The wire-wound large-capacity hydrogen storage container structure capable of avoiding stress relaxation described in the present invention is as follows: Figure 1-3 shown.

[0037] The inner cylinder 2 and the end cap 3 of the hydrogen storage container are made of the same conventional high-strength steel. The toothed reinforcing hoop 1 is sleeved on the opposite open ends of the two end caps 3 and welded firmly. The circumferentially wound steel wire 4 is tightly wound around the cylinder through multiple layers. At the same time, the axially wound steel wire 6 is used to axially wind the reinforcing hoop teeth 101 to apply a pre-tightening force to the container to achieve the reinforcement of the container.

[0038] The inner cylinder body 2 of the container can be composed of multiple cylinder sections, each of which is formed in the factory using a spiral welding process using steel plates. The inner cylinder body 2 is formed by splicing multiple cylinder sections through circumferential welds at the installation site, without axial long welds; the inner cylinder body 2 is connected to the heads 3 on both sides by welding; the heads 3 are stamped with the same high-strength steel as the cylinder, and are symmetrically welded on both sides of the cylinder body 2; it is in the form of a convex head, and the shape can be elliptical, hemispherical or disc-shaped, etc.; the toothed reinforcing hoop 1 is a one-piece structure formed by forging, including a reinforcing ring plate 103, a reinforcing hoop inner ring 102 and reinforcing hoop teeth 101 from the inside to the outside. There are two toothed reinforcing hoops 1, each with an even number of reinforcing hoop teeth 101, and the reinforcing hoop teeth 101 of the two reinforcing hoops correspond to each other in spatial position; the reinforcing hoop inner ring 102 is bowl-shaped, and its contour fits the head 3, and is symmetrically sleeved on the opposite open ends of the heads 3 on both sides of the container; the reinforcing ring plate 103 is used to increase the rigidity of the toothed reinforcing hoop 1, and the outer side thereof is provided with reinforcing hoop teeth 101 alternately. The toothed reinforcing hoop 1 is tightly connected to the container head 3 by welding; the diameter of the circumferentially wound steel wire 4 and the axially wound steel wire 6 are in the millimeter level, and have a tensile strength of more than 1000MPa, which are used to apply pre-tightening force to the container and improve the stress of the inner cylinder 2. The circumferentially wound steel wire 4 is wound on the inner cylinder body 2 of the container, and the wound steel wires and the steel wires and the container cylinder body 2 are bonded by resin; the axially wound steel wire 6 is wound on the tooth pairs at the corresponding positions of the toothed reinforcing hoops 1 on both sides. The basket bolt 5 is located in the middle of the axially wound steel wire 6 between the tooth pairs. By adjusting the basket bolt 5, the tension of the axially wound steel wire 6 can be changed to prevent stress relaxation caused by long-term operation of the container.

[0039] Optionally, the high-strength steel used to manufacture the inner cylinder body 2 and the head 3 has a yield strength range of 600MPa-800MPa; each cylinder segment constituting the cylinder body 2 is quickly formed in the factory using a spiral welding process; the length of a single cylinder segment is 5-15m, which is convenient for conventional transportation machinery to transport to the site, avoiding the use of over-limit transportation due to the excessive length of the container cylinder 2, and effectively reducing transportation costs. A hole is opened at the center of the head 3 for connecting the pipe. The yield strength of the steel used for the toothed reinforcing hoop 1 is not less than 325MPa, and the specific number of teeth and the height of the reinforcing hoop teeth 101 are determined according to design requirements; the reinforcing hoop inner ring 102 is bowl-shaped and covers part of the head 3. The covering angle α ranges from 30-70°, so that the tension of the axially wound steel wire 6 on the reinforcing hoop teeth 101 is evenly dispersed and transmitted to the head 3; the covering angle α refers to the angle between the outer edge of the larger opening end face and the outer edge of the smaller opening end of the reinforcing hoop inner ring 102 with the center of the ring as the center. A larger wrapping angle α can make the force generated by the axially wound steel wire 6 act more evenly on the head 3. Of course, too large a wrapping angle will also lead to more material consumption. A wrapping angle of 30-70° is relatively suitable. In order to ensure the axial tensile strength requirements, the thickness of the inner ring 102 of the reinforcing hoop is not less than the thickness of the head 3; the thickness of the reinforcing hoop teeth 101 and the reinforcing ring 103 should be set to ensure that they can withstand the tension and torque of the axially wound steel wire 6. The outer contour circle diameter of the toothed reinforcing hoop 1 is larger than the diameter of the circle enclosed by the outermost layer of the annularly wound steel wire layer 4, and ensures the space required for axial winding. That is, the outer end of the toothed reinforcing hoop is higher than the outermost layer of the annularly wound steel wire layer, and ensures the space required for the axially wound steel wire winding. Optionally, the cross-section of the reinforcing hoop teeth is a trapezoid with a large outer end and a small bottom end. The resin used to bond the annularly wound steel wire 4 and the inner cylinder body 2 can be cured under normal temperature and pressure conditions. There can be multiple turnbuckle bolts 5 for adjusting the tension of each group of axially wound steel wires 6, but they need to be symmetrically arranged with the axial direction of the inner cylinder body as the center so that the axially wound steel wires 6 are evenly stressed.

[0040] 2. On-site manufacturing method of wire-wound large-capacity hydrogen storage container to avoid stress relaxation:

[0041] Based on the above-mentioned wire-wound large-capacity hydrogen storage container structure that can avoid stress relaxation, the on-site manufacturing method of the hydrogen storage container of the present invention comprises the following steps:

[0042] (1) After the inner cylinder segment, the head 3 and the toothed reinforcing hoop 1 are processed in the factory, they are transported to the site for assembly and manufacturing; the inner cylinder segment is manufactured by the spiral welding process and then quickly formed and transported to the manufacturing site; the cylinder segments are connected by welding to form the inner cylinder body 2, and the cylinder body 2 and the two heads 3 are also welded on site, and the weld form is unified as a girth weld;

[0043] (2) Two prefabricated toothed reinforcing hoops 1 are symmetrically mounted on the ends 3 on both sides of the container, and the positions and angles of the reinforcing hoops 1 are adjusted to ensure that the reinforcing hoop teeth 101 of the two reinforcing hoops 1 correspond to each other in space, and the toothed reinforcing hoops 1 are tightly connected to the ends 3 of the container by welding;

[0044] (3) Wrap the container with steel wire, and apply a certain pre-tightening force to the container through the steel wire during the winding process. First, wrap the circumferential steel wire 4, and bond the wrapped steel wires and the container cylinder 2 with resin. Start from one side of the cylinder and wrap it around the cylinder toward the opposite side along a spiral path, repeating the cycle until the cylinder 2 structure is completely covered by the wrapped steel wire 4 and reaches the designed number of winding layers; then wrap the axial steel wire 6, and the axial winding is carried out in units of the tooth pairs at the corresponding positions of the reinforcement hoops 1 on both sides. After each pair of tooth pairs is wound, another pair of tooth pairs arranged symmetrically is wound to ensure that the toothed reinforcement hoop 1 is evenly stressed during the winding process until all tooth pairs are wound;

[0045] (4) The ring buckles at both ends of the turnbuckle 5 are connected to the axially wound steel wires 6 between each pair of teeth, and the bolt pre-tightening force is adjusted in time according to the stress state of the axially wound steel wires 6. When the container is not filled, the ring buckles of the turnbuckle 5 do not generate tension on the axially wound steel wires, or generate a small tension.

[0046] During operation after commissioning, the hydrogen storage container is constantly subjected to fatigue loads caused by filling and releasing hydrogen, which will cause the container to axially extend and the tension of the winding steel wire 6 to gradually relax. By adjusting the basket bolt 5, the tension of the axial winding steel wire 6 can be adjusted to avoid stress relaxation.

[0047] A specific implementation case:

[0048] The container structure in this implementation case is as follows Figure 1-3 As shown, the on-site manufacturing method of the container is specifically referred to the above method. The container size does not strictly follow the same proportion, and the number of winding wire layers is simplified in the figure for the sake of illustration. The details are as follows:

[0049] The design pressure of the hydrogen storage container is 20MPa, the inner diameter of the container is 1m, the length is 20m, and the inner wall thickness is 6mm. The material used for the inner cylinder body 2 and the head 3 of the container is a high-strength steel with a yield strength of 640MPa; the inner cylinder body 2 is connected by 2 sections of 10m long cylinder segments through circumferential welds to avoid long axial welds and improve the stress of the welds. Each section of the cylinder segment is formed by a spiral welding process. There are two heads 3, which are stamped from the same high-strength steel as the cylinder body 2. Hemispherical heads are selected and symmetrically welded on both sides of the cylinder body 2. A hole is opened in the center for the pipe connection. The inner cylinder body 2 is connected to the heads 3 on both sides by welding, and the weld is in the form of a circumferential weld.

[0050] The toothed reinforcing hoop 1 is forged and formed, and the yield strength of the material used is 400MPa. The toothed reinforcing hoop 1 is composed of reinforcing hoop teeth 101, reinforcing hoop inner ring 102 and reinforcing ring plate 103, and is sleeved near the connection between the head 3 and the cylinder 2. The contour of the reinforcing hoop inner ring 102 fits the shape of the head 3 and is tightly connected to the head through a fillet weld; the reinforcing ring plate connects the reinforcing hoop teeth to increase the rigidity of the reinforcing hoop. The inner ring 102 of the reinforcing hoop covers part of the head 3, and the covering angle α is 30 degrees, so as to evenly and disperse the tension of the axially wound steel wire 6 on the reinforcing hoop teeth 101 and transfer it to the head 3; the thickness of the inner ring 102 of the reinforcing hoop is equal to the thickness of the head 3; the thickness of the reinforcing hoop teeth 101 and the reinforcing ring 103 should be set to ensure that they can withstand the tension and torque of the axially wound steel wire 6; there are two toothed reinforcing hoops 1, each of which has 8 reinforcing hoop teeth 101, and the reinforcing hoop teeth 101 of the two reinforcing hoops 1 correspond to each other in space, and the height of the reinforcing hoop teeth 101 is sufficient to wrap 7-20 layers of axially wound steel wire to meet the design requirements of the axial force of the container.

[0051] The diameter of the circumferentially wound steel wire 4 and the axially wound steel wire 6 is 0.5-2 mm, and has a tensile strength of more than 1.5 GPa, and is used to apply a pre-tightening force to the container and improve the stress of the inner cylinder 2. The circumferentially wound steel wire 4 and the axially wound steel wire 6 are tightly wound around the cylinder body and axially wound around the reinforcing hoop teeth 101, so as to apply a pre-tightening force to the container and strengthen the container. The circumferentially wound steel wire 4 is wound around the inner cylinder body 2 of the container, and the wound steel wires and the steel wires and the container cylinder body 2 are bonded by resin. The number of layers of the circumferentially wound steel wire meets the pressure-bearing requirements; the axially wound steel wire 6 is wound around the tooth pairs at the corresponding positions of the toothed reinforcing hoops 1 on both sides, and the axial reinforcement of the container is achieved by winding around the tooth pairs. The resin used to bond the circumferentially wound steel wire and the inner cylinder body can be cured under normal temperature and pressure conditions.

[0052] The number of the basket bolts 5 is the same as that of the reinforcing hoop teeth 101, which is 8 in total. They are respectively located in the middle of the axially wound steel wire 6 between each pair of teeth of the two reinforcing hoops 1, and the ring buckles at both ends are respectively connected to the axially wound steel wire 6 on both sides between each pair of teeth. When adjusting the basket bolts, the studs on both sides move toward or opposite to each other at the same time, and the axially wound steel wire 6 between the tooth pairs is driven to move closer or farther away through the bolt ring buckles. When the two bundles of axially wound steel wires 6 in the same group gradually approach each other, the tensioning force gradually increases. The basket bolts are adjusted in time according to the force applied to the axially wound steel wire 6, so that the axially wound steel wire is tensioned to a suitable stress state.

[0053] By utilizing the product structure design and on-site manufacturing method of the wire-wound large-capacity hydrogen storage container proposed in the present invention, a substantial transformation of the structure and manufacturing process of the traditional steel strip-wound hydrogen storage container is achieved; by replacing steel strip winding with high-strength steel wire winding, the weight and lightness of the container can be reduced while ensuring the safety performance of the hydrogen storage container. The present invention only needs to use the same high-strength steel as the inner cylinder material, which can not only reduce the thickness of the inner cylinder and thus reduce the total weight of the container, but also use a mature spiral welding process to achieve rapid forming of the inner cylinder and avoid the situation where the axial long weld is poorly stressed. In addition, the use of a basket bolt can conveniently adjust the tension of the axially wound steel wire to prevent stress relaxation of the axially wound steel wire during the operation of the container.

[0054] The above is a preferred embodiment of the present invention, but the technical form involved in the present invention can be implemented in other similar solutions, and is not limited to the description given in the specific implementation mode of the present invention. More precisely, the implementation process given in the present invention is a better way to more thoroughly and comprehensively understand the technical route of the present invention in the technical field involved in the invention. Any changes, improvements and modifications in structure, mode or method made according to the relevant content of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a wire-wound hydrogen storage container capable of avoiding stress relaxation, characterized in that: The main structure of the wire-wound hydrogen storage container includes an inner cylinder body and end caps at both ends, and the inner cylinder body and the end caps are connected by welding; a toothed reinforcing hoop is respectively mounted on the opposite open ends of the two end caps and fixed by welding; a circumferentially wound steel wire is arranged on the outside of the inner cylinder body in a multi-layer spirally wound manner, and the circumferentially wound steel wires and the circumferentially wound steel wires and the inner cylinder body are bonded by resin; The toothed reinforcing hoop is an integral structure formed by forging, and includes an inner ring of the reinforcing hoop, a reinforcing ring plate and a plurality of reinforcing hoop teeth from the inside to the outside; the inner ring of the reinforcing hoop is in a bowl-shaped shape, and has a shape matching the opening end of the head so that the two are closely connected; the reinforcing ring plate is located at the larger opening end of the inner ring of the reinforcing hoop, and a plurality of reinforcing hoop teeth are arranged on the reinforcing ring plate at equal intervals; the two toothed reinforcing hoops are arranged symmetrically, and their reinforcing hoop teeth correspond to each other one by one to form a plurality of combinations; the connecting line of each group of reinforcing hoop teeth is parallel to the axial direction of the inner cylinder body, and axially wound steel wires are arranged between each group of reinforcing hoop teeth in a reciprocating winding manner, and a basket bolt is provided in the middle of each group of axially wound steel wires; the container is strengthened by applying a pre-tightening force to the inner cylinder body by means of the annularly wound steel wire and the axially wound steel wire, and the tensioning force of the axially wound steel wire is adjusted by the basket bolt to avoid stress relaxation; The preparation method of the steel wire wound hydrogen storage container specifically comprises: (1) The inner cylinder section is manufactured by spiral welding in the factory, the toothed reinforcing hoop is manufactured by forging, and the head is manufactured by stamping; (2) The cylinder segments, toothed reinforcing hoops and winding steel wires are transported to the installation site of the hydrogen storage container. After the cylinder segments are connected by on-site welding to form the inner cylinder body, the ends of the cylinder body are welded and the welds are uniformly formed as girth welds; (3) Put two toothed reinforcement hoops symmetrically on the heads on both sides of the container, adjust the position and angle of the reinforcement hoops to ensure that the teeth of each reinforcement hoop correspond one to one in space, and then use welding technology to tightly connect the toothed reinforcement hoop and the head; (4) First, perform circumferential steel wire winding, and bond the wound steel wires and the steel wires to the cylinder with resin until the cylinder structure is completely covered by the wound steel wires and reaches the designed number of winding layers; then perform axial steel wire winding based on the reinforcement hoop tooth groups at the corresponding positions of the reinforcement hoops on both sides; after each group of winding is completed, change to winding another group of reinforcement hoop teeth in the opposite direction to ensure that the toothed reinforcement hoop is evenly stressed during the winding process until all tooth pairs are wound; (5) The ring buckles at both ends of the basket bolt are respectively installed on the two bundles of axially wound steel wires between the single set of reinforcing hoop teeth. The installation position is in the middle of each set of axially wound steel wires, thereby completing the on-site manufacturing of the wire-wound hydrogen storage container.

2. The method according to claim 1, characterized in that: The inner cylinder body is composed of one or more cylinder sections; a single cylinder section is formed by a steel plate through a spiral welding process, and multiple cylinder sections are spliced ​​by ring welding without axial long welds; the length of a single cylinder section is 5-15m.

3. The method according to claim 1, characterized in that The sealing head is formed by stamping a steel plate and is in the form of a convex sealing head with an elliptical, hemispherical or dish-shaped cross section. A hole is opened at the center of the sealing head for connecting external pipelines.

4. The method according to claim 1, characterized in that: The number of reinforcing hoop teeth on the toothed reinforcing hoop is an even number, and the cross-section of the reinforcing hoop teeth is a trapezoid with a larger outer end and a smaller bottom end; the outer end of the toothed reinforcing hoop is higher than the outermost layer of annularly wound steel wire layer, and ensures the space required for winding the axially wound steel wire.

5. The method according to claim 1, characterized in that The basket bolts used to adjust the tension of the axially wound steel wire are symmetrically arranged with the axial direction of the inner cylinder body as the center.

6. The method according to claim 1, characterized in that The inner cylinder body and the head are made of steel with a yield strength range of 600-800MPa; the yield strength of the steel used to manufacture the toothed reinforcement hoop is not less than 325MPa; the diameter of the annularly wound steel wire or the axially wound steel wire is in the millimeter level and has a tensile strength of more than 1000GPa.

7. The method according to claim 1, characterized in that The inner ring of the reinforcing hoop is coated on the outer side of the opening end of the head, the thickness of the inner ring of the reinforcing hoop is not less than the thickness of the head, and the coating angle α is in the range of 30-70°.

8. The method according to claim 1, characterized in that: The resin used for bonding is a resin that cures under normal temperature and pressure conditions.

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