Gas storage structure, gas storage bottle and manufacturing method of gas storage structure

Abstract

The invention relates to the technical field of high-pressure containers, in particular to a gas storage structure, a gas storage bottle and a manufacturing method of the gas storage structure. In the gas storage structure, a straight cylinder section is arranged between two end socket sections; the straight cylinder section is provided with a straight cylinder section end part connected with the end socket section, the end surface, deviating from the straight cylinder section, of the straight cylinder section end part is provided with a first step surface, a second step surface and a first slope surface, the first step surface, the second step surface and the first slope surface are sequentially connected, and the first step surface and the second step surface are connected to form a first step structure; the end socket section is provided with an end socket section end connected with the straight barrel section, the end face, away from the end socket section, of the end socket section end is provided with a third step face, a fourth step face and a second slope face, the third step face, the fourth step face and the second slope face are sequentially connected, and the third step face and the fourth step face are connected to form a second step structure; the first step surface is welded with the third step surface, the second step surface is welded with the fourth step surface, and the first slope surface is welded with the second slope surface.

Description

Technical Field

[0001] The present invention relates to the technical field of high-pressure containers, and in particular to a gas storage structure, a gas storage bottle and a method for manufacturing the gas storage structure. Background Art

[0002] A gas cylinder is a container for storing and transporting gas (such as hydrogen) and is widely used. Gas cylinders have various structures. For example, a hydrogen cylinder for storing hydrogen includes a plastic liner and a composite material layer. The main function of the plastic liner is to limit the leakage or penetration of hydrogen, and the main function of the composite material layer is to withstand high pressure.

[0003] The plastic liner of the hydrogen storage bottle can be manufactured by one-piece molding, but the one-piece molding has high cost, complicated process, and is prone to large dimensional deviation. The plastic liner can also be manufactured in sections and then welded together, but because the plastic liner is thin, it has poor welding strength. Summary of the invention

[0004] In view of this, the present invention aims to propose a gas storage cylinder to solve or partially solve the technical problem that the plastic liner is manufactured in sections and then welded and connected to form, resulting in poor welding strength.

[0005] In the first aspect, an embodiment of the present invention provides an air storage structure, which includes a straight tube section and two head sections, wherein the straight tube section is arranged between the two head sections; the straight tube section is provided with a straight tube section end connected to the head section, and the end surface of the straight tube section end facing away from the straight tube section is provided with a first step surface, a second step surface and a first slope surface, the first step surface, the second step surface and the first slope surface are connected in sequence, and the first step surface and the second step surface are connected to form a first step structure; the head section is provided with a head section end connected to the straight tube section, and the end surface of the head section end facing away from the head section is provided with a third step surface, a fourth step surface and a second slope surface, the third step surface, the fourth step surface and the second slope surface are connected in sequence, and the third step surface and the fourth step surface are connected to form a second step structure; the first step surface and the third step surface are welded, the second step surface and the fourth step surface are welded, and the first slope surface and the second slope surface are welded.

[0006] Optionally, the first step surface and the third step surface are both arranged along the diameter direction of the straight tube section; and / or the second step surface and the fourth step surface are both arranged along the axial direction of the straight tube section.

[0007] Optionally, the first slope surface is parallel to the second slope surface, and an angle between the first slope surface and the axial direction of the straight tube section is in a range of 35°-45°.

[0008] Optionally, the second step surface and the fourth step surface are both arranged along the axial direction of the straight tube section, the length of the second step surface is equal to the length of the fourth step surface, and the length range of the second step surface is 2.5mm-3.5mm.

[0009] Optionally, a first boss is provided at the end of the straight tube section, which protrudes from the outer surface of the straight tube section along the diameter direction of the straight tube section, and a third slope is provided on the end surface of the first boss facing away from the straight tube section, and the third slope is connected to one end of the first step surface facing away from the second step surface; a second boss is provided at the end of the head section, which protrudes from the outer surface of the head section along the diameter direction of the straight tube section, and a fourth slope is provided on the end surface of the second boss facing away from the head section, and the fourth slope is connected to one end of the third step surface facing away from the fourth step surface; the third slope fits with the fourth slope, and the first boss and the second boss are suitable for being removed after the end of the straight tube section and the end of the head section are welded.

[0010] Optionally, along the diameter direction of the straight tube section, the height of the third slope surface is the same as the height of the fourth slope surface, the height of the first slope surface is the same as the height of the second slope surface, and the height of the third slope surface is greater than the height of the first slope surface.

[0011] Optionally, the third slope is parallel to the first slope, and the fourth slope is parallel to the second slope.

[0012] In a second aspect, an embodiment of the present invention further provides a gas storage cylinder, which includes a composite material layer and the above-mentioned gas storage structure, wherein the composite material layer is wrapped around the periphery of the gas storage structure.

[0013] In the third aspect, an embodiment of the present invention also provides a method for manufacturing an air storage structure, which is applied to the above-mentioned air storage structure. The manufacturing method includes connecting the end of the straight cylinder section and the end of the head section to make the first step surface and the third step surface fit together, the second step surface and the fourth step surface fit together, and the first slope surface and the second slope surface fit together; welding the first step surface and the third step surface, the second step surface and the fourth step surface, and the first slope surface and the second slope surface.

[0014] Optionally, the end of the straight tube section is provided with a first boss protruding from the outer surface of the straight tube section along the diameter direction of the straight tube section, the end surface of the first boss facing away from the straight tube section is provided with a third slope surface, and the third slope surface is connected to one end of the first step surface facing away from the second step surface; the end of the head section is provided with a second boss protruding from the outer surface of the head section along the diameter direction of the straight tube section, the end surface of the second boss facing away from the head section is provided with a fourth slope surface, and the fourth slope surface is connected to one end of the second step surface facing away from the fourth step surface; the manufacturing method includes: docking the end of the straight tube section and the end of the head section, so that the first step surface and the third step surface are fitted together, the second step surface and the fourth step surface are fitted together, the first slope surface and the second slope surface are fitted together, and the third slope surface and the fourth slope surface are fitted together; using a limit plate to cover the first boss and the second boss along the diameter direction of the straight tube section; welding the first step surface and the third step surface, the second step surface and the fourth step surface, and the first slope surface and the second slope surface; removing the first boss and the second boss.

[0015] Optionally, when projected onto the axis of the straight tube section, the limit plate and the first step surface, the second step surface, the third step surface, the fourth step surface, the first slope surface and the second slope surface do not intersect.

[0016] Optionally, in the steps of welding the first step surface and the third step surface, the second step surface and the fourth step surface, and the first slope surface and the second slope surface, a first welder and a second welder are used, the first welder being set corresponding to the second step surface and the fourth step surface, and welding the second step surface and the fourth step surface, and the first step surface and the third step surface; the second welder being set corresponding to the first slope surface and the second slope surface, and welding the first slope surface and the second slope surface.

[0017] The present invention discloses a gas storage structure. When the straight tube section is connected to the end cap section, the first step surface and the third step surface are welded, and the second step surface and the fourth step surface are welded. The first step structure and the second step structure are matched and clamped, and the first slope surface and the second slope surface are welded, so that the end of the straight tube section and the end cap section have a larger connection area, and are easy to weld and butt; the straight tube section and the end cap section can cooperate with the welding tool to keep stable and not slide under the clamping force and extrusion force given during the welding process, effectively avoiding displacement due to extrusion during the welding process, difficulty in the operation of the welding tool, loose welding and poor welding strength, and affecting the sealing. Moreover, since the end of the straight tube section and the end cap section are easy to weld and butt, the wall thickness of the straight tube section and the end cap section can be reduced, the volume of the gas storage structure is increased, and the weight of the gas storage structure is reduced.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of the gas storage structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the gas storage structure after welding according to the present invention;

[0022] Figure 3 It is a schematic cross-sectional structural diagram of the head section of the present invention;

[0023] Figure 4 It is a cross-sectional structural schematic diagram of an enlarged straight tube section end and a head section end according to the present invention;

[0024] Figure 5 The welding process of the end of the straight tube section and the end of the head section according to the present invention is shown in FIG. Figure 1 ;

[0025] Figure 6 The welding process of the end of the straight tube section and the end of the head section according to the present invention is shown in FIG. Figure 2 ;

[0026] Figure 7 The welding process of the end of the straight tube section and the end of the head section according to the present invention is shown in FIG. Figure 3 ;

[0027] Figure 8 The process diagram of the manufacturing method of the gas storage structure of the present invention is shown in FIG. Figure 1 ;

[0028] Fig. 9 The process diagram of the manufacturing method of the gas storage structure of the present invention is shown in FIG. Figure 2 .

[0029] Reference numerals:

[0030] 10. straight section; 11. end of the straight section; 12. first step surface; 13. second step surface; 14. first slope surface; 15. first boss; 16. third slope surface; 17. first transition portion;

[0031] 20. End section; 21. End section of end section; 22. Third step surface; 23. Fourth step surface; 24. Second slope surface; 25. Second boss; 26. Fourth slope surface; 27. Transition area; 28. Bottle mouth; 29. ​​Second transition section;

[0032] 40. Limiting plate; 51. First welder; 52. Second welder; 60. Welding seam; 70. Outer surface of the gas storage structure. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can also be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0034] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0035] The present application embodiment provides a gas storage structure, referring to Figures 1 to 7As shown, the gas storage structure includes a straight section 10 and two end sections 20, the straight section 10 is arranged between the two end sections 20 and connected to the two end sections 20 respectively; wherein the straight section 10 is provided with a straight section end 11 connected to the end section 20, and the end surface of the straight section end 11 facing away from the straight section 10 is provided with a first step surface 12, a second step surface 13 and a first slope surface 14, the first step surface 12, the second step surface 13 and the first slope surface 14 are connected in sequence, and the first step surface 12 and the second step surface 13 are connected to form a first step surface 14. The head section 20 is provided with a head section end 21 connected to the straight tube section 10, and the end surface of the head section end 21 facing away from the head section 20 is provided with a third step surface 22, a fourth step surface 23 and a second slope surface 24, the third step surface 22, the fourth step surface 23 and the second slope surface 24 are connected in sequence, and the third step surface 22 and the fourth step surface 23 are connected to form a second step structure; the first step surface 12 and the third step surface 22 are welded, the second step surface 13 and the fourth step surface 23 are welded, and the first slope surface 14 and the second slope surface 24 are welded.

[0036] In the present application, refer to Figure 1 and Figure 2 As shown, the straight tube section 10 is disposed between two end-end sections 20 and is welded to the two end-end sections 20 respectively.

[0037] Further references Figure 4 As shown, the first step surface 12 is close to the outer circumference of the straight tube section 10, the end of the first slope surface 14 away from the second step surface 13 is located on the inner wall of the straight tube section 10, and the first slope surface 14 is inclined from the inner wall of the straight tube section 10 to the direction away from the straight tube section 10. The third step surface 22 is close to the outer circumference of the head section 20, the end of the second slope surface 24 away from the fourth step surface 23 is located on the inner wall of the head section 20, and the second slope surface 24 is inclined from the inner wall of the head section 20 to the direction toward the head section 20.

[0038] In the gas storage structure of the embodiment of the present application, when the straight section 10 is connected to the end section 20, the first step surface 12 and the third step surface 22 are welded, and the second step surface 13 and the fourth step surface 23 are welded, so that the first step structure and the second step structure are matched and clamped, and the first slope surface 14 and the second slope surface 24 are welded, so that there is a large connection area between the end 11 of the straight section and the end 21 of the end section, and it is easy to weld and dock; the straight section 10 and the end section 20 can cooperate with the welding tool to keep stable and not slide under the clamping force and extrusion force given during the welding process, effectively avoiding displacement due to extrusion during the welding process, difficulty in the operation of the welding tool, loose welding and poor welding strength, and affecting the sealing. In addition, since the end 11 of the straight section and the end 21 of the end section are easy to weld and dock, the wall thickness of the straight section 10 and the end section 20 can be reduced, the volume of the gas storage structure is increased, and the weight of the gas storage structure is reduced.

[0039] In some embodiments, reference Figure 4 As shown, the first step surface 12 and the third step surface 22 are both arranged along the diameter direction of the straight tube section 10, that is, arranged along the X-axis direction. At this time, when the welding fixture applies an extrusion force in the Y direction to the straight tube section 10 and the head section 20 during the welding process, the first step surface 12 and the third step surface 22 can ensure that the straight tube section end 11 and the head section end 21 do not slide, thereby effectively avoiding displacement due to extrusion during the welding process, resulting in problems such as loose welding and poor welding strength.

[0040] In some embodiments, reference Figure 4 As shown, the second step surface 13 and the fourth step surface 23 are both arranged along the axial direction of the straight tube section 10, that is, along the Y-axis direction. At this time, when the welding fixture applies a clamping force in the X direction to the straight tube section 10 and the head section 20 during the welding process, the second step surface 13 and the fourth step surface 23 can ensure that the straight tube section end 11 and the head section end 21 do not slide, thereby effectively avoiding displacement due to extrusion during the welding process, resulting in problems such as loose welding and poor welding strength.

[0041] In some embodiments, the first slope 14 and the second slope 24 are parallel, and the angle between the first slope 14 and the axis of the straight tube section 10 is in the range of 35°-45°. Figure 6 As shown, the inner wall of the straight tube section 10 is arranged along the axial direction of the straight tube section 10, and the angle between the first slope surface 14 and the axial direction of the straight tube section 10 is α.

[0042] In the embodiment of the present application, the first slope 14 and the second slope 24 are parallel, so the first slope 14 and the second slope 24 can better cooperate and contact, and the first slope 14 and the second slope 24 can be better welded, ensuring the welding firmness and welding strength between the first slope 14 and the second slope 24, so that the air storage structure has better sealing.

[0043] The first slope 14 and the second slope 24 are parallel, and the angle between the first slope 14 and the axial direction of the straight tube section 10 is in the range of 35°-45°. The first slope 14 and the second slope 24 can better cooperate with the welding tooling to maintain a certain assembly strength, and the molten pool generated during the welding process is not easy to flow downward or be squeezed out of the weld more, so as to avoid welding problems.

[0044] In a specific embodiment, the angles between the first slope 14 and the second slope 24 and the axial direction of the straight tube section 10 are both 40°. It can be understood that the angles between the first slope 14 and the second slope 24 and the axial direction of the straight tube section 10 are set according to specific usage requirements. For example, the angles between the first slope 14 and the second slope 24 and the axial direction of the straight tube section 10 are both 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, and multiple angles between the above angles.

[0045] In some embodiments, the second step surface 13 and the fourth step surface 23 are both arranged along the axial direction of the straight tube section 10, the length of the second step surface 13 is equal to the length of the fourth step surface 23, and the length range of the second step surface 13 is 2.5mm-3.5mm.

[0046] Reference Figure 6 As shown, along the axial direction of the straight tube section 10, the length of the second step surface 13 and the fourth step surface 23 are both L, and the range of L is 2.5mm-3.5mm.

[0047] In the embodiment of the present application, when the length of the second step surface 13 is within the above range, the second step surface 13 and the fourth step surface 23 can achieve higher intensity by cooperating with the laser spot diameter and defocus amount in the welding process parameters.

[0048] In a specific embodiment, along the axial direction of the straight tube section 10, the length of the first slope 14 and the length of the second slope 24 are both 3 mm. It can be understood that the length of the first slope 14 and the length of the second slope 24 are specifically set according to the use requirements. For example, the length of the first slope 14 and the length of the second slope 24 are both 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, and multiple values ​​between the above values.

[0049] In some embodiments, the straight tube section end 11 is provided with a first boss 15 protruding from the outer surface of the straight tube section 10 along the diameter direction of the straight tube section 10, and the end surface of the first boss 15 facing away from the straight tube section 10 is provided with a third slope 16, and the third slope 16 is connected to the end of the first step surface 12 facing away from the second step surface 13; the head section end 21 is provided with a second boss 25 protruding from the outer surface of the head section 20 along the diameter direction of the straight tube section 10, and the end surface of the second boss 25 facing away from the head section 20 is provided with a fourth slope 26, and the fourth slope 26 is connected to the end of the third step surface 22 facing away from the fourth step surface 23; the third slope 16 and the fourth slope 26 are in contact with each other, and the first boss 15 and the second boss 25 are suitable for being removed after the straight tube section end 11 and the head section end 21 are welded.

[0050] In the embodiment of the present application, when the straight tube section 10 is connected to the head section 20, the third slope 16 and the fourth slope 26 are in contact, so that there is a larger connection area between the end 11 of the straight tube section and the end 21 of the head section, and it is easy to weld and dock; coupled with the first step structure and the second step structure being cooperated and clamped, and the first slope 14 and the second slope 24 being welded, the straight tube section 10 and the head section 20 can cooperate with the welding tooling to remain stable and not slide under the clamping force and extrusion force given during the welding process, effectively avoiding displacement due to extrusion during the welding process, difficulty in the operation of the welding tooling, loose welding and poor welding strength, which affect the sealing.

[0051] Further references Figure 4 As shown, the third slope surface 16 is inclined from the first step surface 12 in a direction away from the straight tube section 10, and the third slope surface 16 and the first slope surface 14 have the same inclination direction. The fourth slope surface 26 is inclined from the third step surface 22 in a direction toward the end section 20. The fourth slope surface 26 and the second slope surface 24 have the same inclination direction.

[0052] In some embodiments, reference Figure 4 and Figure 6 As shown, along the diameter direction of the straight tube section 10, that is, the X-axis direction, the height of the third slope 16 is the same as the height of the fourth slope 26, the height of the first slope 14 is the same as the height of the second slope 24, and the height H1 of the third slope 16 is greater than the height H2 of the first slope 14.

[0053] In some embodiments, the third slope 16 and the fourth slope 26 are also parallel, so that the third slope 16 and the fourth slope 26 can better cooperate and contact. In addition, the angle between the third slope 16 and the axis direction of the straight tube section 10 is in the range of 35°-45°. Figure 6 As shown, the inner wall of the straight tube section 10 is arranged along the axial direction of the straight tube section 10, and the angle between the third slope surface 16 and the axial direction of the straight tube section 10 is β.

[0054] In some embodiments, α and β are the same, both in the range of 35°-45°. When α and β are in the above range, stress concentration during welding under the clamping force of the welding tool is effectively avoided, and setting the above angle to an acute angle of 45° or less can better cooperate with the installation of the welder and the adjustment of welding process parameters.

[0055] In some embodiments, a first transition portion 17 is provided between the side wall of the first boss 15 and the outer peripheral wall of the straight section end 11, and the first transition portion 17 is a first fillet at a first preset angle (the first preset angle is, for example, 45°). The provision of the first transition portion 17 can effectively reduce the residual stress generated during welding extrusion force and subsequent processing, and reduce damage to the gas storage structure during the subsequent machining process of removing the first boss 15.

[0056] In some embodiments, the radius of the first fillet is in the range of 5 mm to 10 mm. When the radius of the first fillet is in the above range, the mechanical damage during welding and machining can be reduced to a large extent, and the mechanical properties around the weld can be retained. The specific radius of the first fillet is set according to the use requirements. For example, the radius of the first fillet is 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 8.5 mm, 10 mm, and multiple values ​​between the above values.

[0057] In some embodiments, a second transition portion 29 is provided between the side wall of the second boss 25 and the outer peripheral wall of the end portion 21 of the head section, and the second transition portion 29 is a second fillet at a second preset angle (the second preset angle is, for example, 45°). The provision of the second transition portion 29 can effectively reduce the residual stress generated during welding extrusion force and subsequent processing, and reduce damage to the gas storage structure during the subsequent machining process of removing the second boss 25.

[0058] In some embodiments, the radius of the second fillet is in the range of 5 mm to 10 mm. When the radius of the second fillet is in the above range, the mechanical damage during welding and machining can be reduced to a large extent, and the mechanical properties around the weld can be retained. The specific radius of the second fillet is set according to the use requirements. For example, the radius of the second fillet is 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 8.5 mm, 10 mm, and multiple values ​​between the above values.

[0059] In some embodiments, the material of the straight tube section 10 includes at least one of polyethylene, polyamide, polyphthalamide, and polyoxymethylene. In this case, the straight tube section 10 is a thermoplastic polymer piece suitable for welding connection. It is understood that in actual use, the above materials can also be modified to meet the use requirements.

[0060] In some embodiments, the material of the head section 20 includes at least one of polyethylene, polyamide, polyphthalamide, and polyoxymethylene. In this case, the head section 20 is a thermoplastic polymer part suitable for welding connection. It is understood that in actual use, the above materials can also be modified to meet the use requirements.

[0061] When the straight tube section 10 and the end section 20 are made of the above materials, the gas storage structure is a plastic structural member, such as a plastic liner.

[0062] In some embodiments, the material of the straight tube section end 11 also includes carbon black. In this case, during the process of laser welding the gas storage structure, the straight tube section end 11 can absorb heat, thereby better realizing laser welding.

[0063] In some embodiments, reference Figure 1 As shown, the straight tube section 10 is a straight tube structure with two ends open. Figure 1 and Figure 3 As shown, the end section 20 is an ellipsoidal structure, and the end surface of the straight tube section end 11 facing away from the straight tube section 10 is completely fitted with the end surface of the end section 21 facing away from the end section 20, forming a closed weld under the welding process.

[0064] In one embodiment, the end cap section 20 is a semi-ellipsoidal structure, and the major axis and the minor axis of the semi-ellipsoidal structure have an ellipsoidal ratio of 2:1. In this case, the end cap section 20 is a stable pressure-bearing structure. The curvature of the end cap section 20 is suitable for arranging a composite material layer outside the gas storage structure, and is conducive to reducing the overlap and overhead phenomenon of the composite material layer during the manufacturing process.

[0065] The gas storage structure of the embodiment of the present application is a thin-walled liner structure. Figure 7 As shown, the wall thickness H0 of the straight section 10 is 3mm-4mm, which can maximize the volume while ensuring the sealing of high-pressure gas. Since the head section 20 bears a large pressure, the wall thickness of the head section 20 gradually increases, and a transition area 27 is formed at a preset position away from the end 21 of the head section. The wall thickness of the head section 20 gradually increases to 5mm-6mm at the bottle mouth 28. In the embodiment of the present application, the two head sections 20 have the same structure and are symmetrically arranged.

[0066] In the gas storage structure of the embodiment of the present application, when the straight section 10 is connected to the end section 20, the first step surface 12 and the third step surface 22 are welded, and the second step surface 13 and the fourth step surface 23 are welded, so that the first step structure and the second step structure are matched and clamped, and the first slope surface 14 and the second slope surface 24 are welded, and the third slope surface 16 and the fourth slope surface 26 are in contact, so that there is a large connection area between the end 11 of the straight section and the end 21 of the end section, and it is easy to weld and dock; the straight section 10 and the end section 20 can cooperate with the welding tool to keep stable and not slide under the clamping force and extrusion force given during the welding process, effectively avoiding displacement due to extrusion during the welding process, difficulty in the welding tool, loose welding and poor welding strength, and affecting the sealing. In addition, since the end 11 of the straight section and the end 21 of the end section are easy to weld and dock, the wall thickness of the straight section 10 and the end section 20 can also be reduced, thereby reducing the wall thickness of the gas storage structure, increasing the volume of the gas storage structure, and reducing the overall weight of the gas storage structure.

[0067] An embodiment of the present application provides a gas storage cylinder, which includes a composite material layer and the above-mentioned gas storage structure, wherein the composite material layer is wrapped around the periphery of the gas storage structure.

[0068] In the embodiment of the present application, the above-mentioned gas storage structure is used in the gas storage cylinder, which has the advantages of firm welding, high welding strength and good sealing of the above-mentioned gas storage structure.

[0069] Furthermore, the gas storage structure can be used as an inner liner, and when the material of the straight section 10 includes at least one of polyethylene, polyamide, polyphthalamide, and polyformaldehyde, and the material of the head section 20 includes at least one of polyethylene, polyamide, polyphthalamide, and polyformaldehyde, the gas storage structure is a plastic inner liner. Compared with metal inner liners, plastic inner liners are more fatigue-resistant, have a longer life, and lower cost during the process of filling and discharging high-pressure gas (such as hydrogen). With the composite material layer to withstand pressure, the thickness of the plastic inner liners can be reduced to a few millimeters. Compared with gas cylinders with metal inner liners, they can store more gas on the basis of reduced mass and have a higher gas storage volume-to-weight ratio. When storing hydrogen in a plastic inner liner, the hydrogen embrittlement problem of metal in hydrogen can be avoided, and the leakage and penetration of hydrogen molecules can be effectively blocked.

[0070] In some embodiments, the composite material layer is wound around the periphery of the gas storage structure. The composite material layer includes fibers such as carbon fiber and glass fiber. The fibers are spread around the periphery of the gas storage structure at a certain angle to resist deformation and failure of the plastic liner under high pressure conditions. The thickness of the composite material layer can be set according to the use requirements, for example, the thickness is 20mm-30mm. The plastic liner and the composite material layer work together to have high pressure resistant sealing performance.

[0071] The present application provides a method for manufacturing a gas storage structure. The manufacturing method is applied to the above-mentioned gas storage structure. Figure 8 As shown, the manufacturing method comprises the following steps:

[0072] S11, butt the straight tube section end 11 and the head section end 21, so that the first step surface 12 and the third step surface 22 are in contact with each other, the second step surface 13 and the fourth step surface 23 are in contact with each other, and the first slope surface 14 and the second slope surface 24 are in contact with each other.

[0073] In this step, the straight section end 11 of the straight section 10 and the end section end 21 of the end section 20 are butted together. A welding tool is used to apply extrusion force so that the first step surface 12 and the third step surface 22 are fitted together, the second step surface 13 and the fourth step surface 23 are fitted together, and the first slope surface 14 and the second slope surface 24 are fitted together.

[0074] In some embodiments, both the straight barrel section 10 and the end cap section 20 are injection molded parts. Two sets of molds can be used for injection molding, the first set of molds is used for injection molding the straight barrel section 10 , and the second set of molds is used for injection molding the end cap section 20 .

[0075] S12, welding the first step surface 12 and the third step surface 22, the second step surface 13 and the fourth step surface 23, and the first slope surface 14 and the second slope surface 24.

[0076] In this step, the first step surface 12 and the third step surface 22 are connected, the second step surface 13 and the fourth step surface 23 are connected, and the first slope surface 14 and the second slope surface 24 are connected through the first step surface 12 and the third step surface 22, the second step surface 13 and the fourth step surface 23, and the first slope surface 14 and the second slope surface 24.

[0077] After welding, a vertical weld is formed along the diameter direction of the straight tube section 10, a horizontal weld is formed along the axial direction of the straight tube section 10, and a first slope weld is formed between the first slope 14 and the second slope 24. The vertical weld, the horizontal weld and the first slope weld are connected in sequence.

[0078] In this step, the straight tube section 10 and the two head sections 20 can be welded simultaneously, which has the advantage of high welding efficiency.

[0079] In some embodiments, the end 11 of the straight tube section is provided with a first boss 15 protruding from the outer surface of the straight tube section 10 along the diameter direction of the straight tube section 10, and the end surface of the first boss 15 facing away from the straight tube section 10 is provided with a third slope 16, and the third slope 16 is connected to the end of the first step surface 12 facing away from the second step surface 13; the end 21 of the head section is provided with a second boss 25 protruding from the outer surface of the head section 20 along the diameter direction of the straight tube section 10, and the end surface of the second boss 25 facing away from the head section 20 is provided with a fourth slope 26, and the fourth slope 26 is connected to the end of the second step surface 13 facing away from the fourth step surface 23; at this time, the manufacturing method includes the following steps, referring to Fig. 9 As shown:

[0080] S21, connect the straight tube section end 11 and the head section end 21, so that the first step surface 12 and the third step surface 22 are in contact with each other, the second step surface 13 and the fourth step surface 23 are in contact with each other, the first slope surface 14 and the second slope surface 24 are in contact with each other, and the third slope surface 16 and the fourth slope surface 26 are in contact with each other.

[0081] In this step, the straight section end 11 of the straight section 10 and the head section end 21 of the head section 20 are connected, and a welding tool is used to apply extrusion pressure so that the straight section end 11 and the head section end 21 are completely fitted together, that is, the first step surface 12 and the third step surface 22 are fitted together, the second step surface 13 and the fourth step surface 23 are fitted together, the first slope surface 14 and the second slope surface 24 are fitted together, and the third slope surface 16 and the fourth slope surface 26 are fitted together.

[0082] S22 , using the limiting plate 40 to press the first boss 15 and the second boss 25 along the diameter direction of the straight tube section 10 .

[0083] In this step, pressure is applied to the first boss 15 and the second boss 25 along the diameter direction of the straight tube section 10 and toward the inside of the straight tube section 10, so as to further make the first step surface 12 fit with the third step surface 22, the second step surface 13 fit with the fourth step surface 23, the first slope surface 14 fit with the second slope surface 24, and the third slope surface 16 fit with the fourth slope surface 26, and ensure the fit between the above-mentioned surfaces.

[0084] The limit plate 40 is a component in the welding tool. Furthermore, the welding tool also presses the two end sections 20 and applies force, so that the end section end 21 squeezes the end section end 11 along the axial direction of the straight tube section 10, so that the first step surface 12 fits with the third step surface 22, the second step surface 13 fits with the fourth step surface 23, the first slope surface 14 fits with the second slope surface 24, and the third slope surface 16 fits with the fourth slope surface 26. The force between the first slope surface 14 and the second slope surface 24 and the third slope surface 16 and the fourth slope surface 26 will produce an upward sliding tendency, and the limit plate 40 presses down the first boss 15 and the second boss 25, so that the second step surface 13 and the fourth step surface 23 are completely fitted, while suppressing the relative sliding between the first slope surface 14 and the second slope surface 24 and the third slope surface 16 and the fourth slope surface 26.

[0085] S23 , welding the first step surface 12 and the third step surface 22 , the second step surface 13 and the fourth step surface 23 , and the first slope surface 14 and the second slope surface 24 .

[0086] In this step, a certain pressure is maintained after welding, and the weld surface is cooled and solidified.

[0087] In some embodiments, the limiting plate 40 does not intersect with the first step surface 12, the second step surface 13, the third step surface 22, the fourth step surface 23, the first slope surface 14, and the second slope surface 24 when projected onto the axis of the straight tube section 10. Then, the limiting plate 40 will not block the welding of the first step surface 12, the second step surface 13, the third step surface 22, the fourth step surface 23, the first slope surface 14, and the second slope surface 24, ensuring that there will be no interference with the welding. During the welding process, the welding pressure makes the melting more complete, which can reduce the gap of the welding molten pool.

[0088] In some embodiments, welding includes at least one of laser welding, infrared welding, ultrasonic welding, hot plate welding, and vibration friction welding. The above welding is a relatively conventional welding method, and the embodiments of the present application do not specifically limit this.

[0089] Furthermore, the second step surface 13 and the fourth step surface 23 are both arranged along the axial direction of the straight tube section 10, the lengths of the second step surface 13 and the fourth step surface 23 are equal, and the length ranges of the second step surface 13 and the fourth step surface 23 are both 2.5mm-3.5mm. At this time, the use of laser welding can be combined with the laser spot diameter and defocus amount in the welding process parameters to achieve higher intensity.

[0090] When laser welding is performed, the material of the end portion 21 of the end portion ...

[0091] In the embodiment of the present application, the combined weld formed by welding the third step surface 22, the fourth step surface 23, the second slope surface 24, and the first step surface 12, the second step surface 13, and the first slope surface 14 can resist the forces of the gas storage structure along the X-axis and Y-axis directions, and work together to improve the strength of the weld.

[0092] In some embodiments, in the steps of welding the first step surface 12 and the third step surface 22, the second step surface 13 and the fourth step surface 23, and the first slope surface 14 and the second slope surface 24, a first welder 51 and a second welder 52 are used. The first welder 51 is set corresponding to the second step surface 13 and the fourth step surface 23 to weld the second step surface 13 and the fourth step surface 23, and the first step surface 12 and the third step surface 22; the second welder 52 is set corresponding to the first slope surface 14 and the second slope surface 24 to weld the first slope surface 14 and the second slope surface 24.

[0093] In the embodiment of the present application, the first welder 51 and the second welder 52 are used for welding simultaneously, which has the advantages of high welding efficiency, accurate welding corresponding positions, and good welding effect.

[0094] In a specific embodiment, when the first welder 51 and the second welder 52 are both laser welders, the gas storage structure is for dual laser beam transmission welding, and the laser is irradiated at the same time, and the laser power is 50-90W, referring to Figure 5As shown, the first welder 51 acts on the second step surface 13 and the fourth step surface 23, and the second welder 52 acts on the first slope surface 14 and the second slope surface 24. The two welding surfaces begin to melt at the same time. After the welding is completed, the pressure on both sides and the pressure on the limit plate 40 are kept static for a preset time, such as 20 seconds to 40 seconds to cool, to form two horizontal and inclined welds, refer to Figure 7 As shown, the fusion is combined into a weld 60. Then it is removed from the welding tool and the next step is carried out.

[0095] S23, removing the first boss 15 and the second boss 25.

[0096] In this step, after welding is completed, the first boss 15 and the second boss 25 are removed by machining ( Figure 6 In part B), the machining process of this embodiment includes at least one of grinding and polishing, turning, milling, and thermal cutting. The preferred machining process is grinding and polishing, and then grinding with a grinding wheel and sandpaper until the outer surface 70 of the gas storage structure is flat and smooth.

[0097] The manufacturing method of the gas storage structure of the embodiment of the present application can save the process time of mass production, avoid the expensive one-piece molding of the gas storage structure, and avoid the problem of large dimensional deviation of large injection molded parts in the melting cavity.

[0098] The structure and manufacturing method of the straight cylinder section end 11 and the end 21 of the head section in the gas storage structure can maintain the welding quality on the basis of reducing the wall thickness of the gas storage structure, increase the volume, ensure the sealing effect of welding, ensure the strength of the gas storage structure in different directions, and can better resist the multi-directional tension and pressure generated by the high-pressure gas in the bottle around the welding point. The welding tool provides welding pressure in the horizontal and vertical directions at the same time, and controls the pressure holding time. In terms of welding technology, it is conducive to the batch welding of the inner liner with the welding tool, reducing the processing procedures and saving time. At the same time, it saves costs and improves production efficiency.

[0099] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0100] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. For the embodiments of the device, electronic device, computer-readable storage medium and computer program products containing instructions, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiments.

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A gas storage structure, characterized in that: The gas storage structure comprises a straight tube section (10) and two end sections (20), wherein the straight tube section (10) is arranged between the two end sections (20); The straight tube section (10) is provided with a straight tube section end portion (11) connected to the head section (20); the end surface of the straight tube section end portion (11) facing away from the straight tube section (10) is provided with a first step surface (12), a second step surface (13) and a first slope surface (14); the first step surface (12), the second step surface (13) and the first slope surface (14) are connected in sequence; the first step surface (12) and the second step surface (13) are connected to form a first step structure; The end section (20) is provided with an end section end (21) connected to the straight tube section (10); the end surface of the end section end (21) facing away from the end section (20) is provided with a third step surface (22), a fourth step surface (23) and a second slope surface (24); the third step surface (22), the fourth step surface (23) and the second slope surface (24) are connected in sequence; the third step surface (22) and the fourth step surface (23) are connected to form a second step structure; The first step surface (12) and the third step surface (22) are welded, the second step surface (13) and the fourth step surface (23) are welded, and the first slope surface (14) and the second slope surface (24) are welded.

2. The gas storage structure according to claim 1, characterized in that: The first step surface (12) and the third step surface (22) are both arranged along the diameter direction of the straight tube section (10); and / or, The second step surface (13) and the fourth step surface (23) are both arranged along the axial direction of the straight tube section (10).

3. The gas storage structure according to claim 1, characterized in that: The first slope surface (14) and the second slope surface (24) are parallel, and the angle between the first slope surface (14) and the axial direction of the straight tube section (10) is in the range of 35°-45°.

4. The gas storage structure according to claim 1, characterized in that: The second step surface (13) and the fourth step surface (23) are both arranged along the axial direction of the straight tube section (10), the length of the second step surface (13) is equal to the length of the fourth step surface (23), and the length range of the second step surface (13) is 2.5 mm-3.5 mm.

5. The gas storage structure according to claim 1, characterized in that: The end portion (11) of the straight tube section is provided with a first boss (15) protruding from the outer surface of the straight tube section (10) along the diameter direction of the straight tube section (10); the end surface of the first boss (15) facing away from the straight tube section (10) is provided with a third slope surface (16); the third slope surface (16) is connected to an end of the first step surface (12) facing away from the second step surface (13); The end portion (21) of the head section is provided with a second boss (25) protruding from the outer surface of the head section (20) along the diameter direction of the straight tube section (10); the end surface of the second boss (25) facing away from the head section (20) is provided with a fourth slope surface (26); the fourth slope surface (26) is connected to an end of the third step surface (22) facing away from the fourth step surface (23); The third slope surface (16) and the fourth slope surface (26) are in close contact with each other, and the first boss (15) and the second boss (25) are suitable for being removed after the straight tube section end (11) and the head section end (21) are welded.

6. The gas storage structure according to claim 5, characterized in that: Along the diameter direction of the straight tube section (10), the height of the third slope surface (16) is the same as the height of the fourth slope surface (26), the height of the first slope surface (14) is the same as the height of the second slope surface (24), and the height of the third slope surface (16) is greater than the height of the first slope surface (14).

7. The gas storage structure according to claim 5, characterized in that: The third slope surface (16) is parallel to the first slope surface (14), and the fourth slope surface (26) is parallel to the second slope surface (24).

8. A gas storage cylinder, characterized in that: The gas storage cylinder comprises a composite material layer and the gas storage structure according to any one of claims 1 to 7, wherein the composite material layer is wrapped around the periphery of the gas storage structure.

9. A method for manufacturing a gas storage structure, characterized in that: The gas storage structure according to any one of claims 1 to 7 is manufactured by a method comprising: The end portion (11) of the straight tube section and the end portion (21) of the head section are butted together, so that the first step surface (12) and the third step surface (22) are in contact with each other, the second step surface (13) and the fourth step surface (23) are in contact with each other, and the first slope surface (14) and the second slope surface (24) are in contact with each other; The first step surface (12) and the third step surface (22), the second step surface (13) and the fourth step surface (23), and the first slope surface (14) and the second slope surface (24) are welded.

10. The method for manufacturing a gas storage structure according to claim 9, characterized in that: The end portion (11) of the straight tube section is provided with a first boss (15) protruding from the outer surface of the straight tube section (10) along the diameter direction of the straight tube section (10); the end surface of the first boss (15) facing away from the straight tube section (10) is provided with a third slope surface (16); the third slope surface (16) is connected to one end of the first step surface (12) facing away from the second step surface (13); the end portion (21) of the head section is provided with a second boss (25) protruding from the outer surface of the head section (20) along the diameter direction of the straight tube section (10); the end surface of the second boss (25) facing away from the head section (20) is provided with a fourth slope surface (26); the fourth slope surface (26) is connected to one end of the second step surface (13) facing away from the fourth step surface (23); the manufacturing method comprises: The end portion (11) of the straight tube section and the end portion (21) of the head section are butted together, so that the first step surface (12) and the third step surface (22) are in contact with each other, the second step surface (13) and the fourth step surface (23) are in contact with each other, the first slope surface (14) and the second slope surface (24) are in contact with each other, and the third slope surface (16) and the fourth slope surface (26) are in contact with each other; Using a limiting plate (40) to press the first boss (15) and the second boss (25) along the diameter direction of the straight tube section (10); Welding the first step surface (12) and the third step surface (22), the second step surface (13) and the fourth step surface (23), and the first slope surface (14) and the second slope surface (24); The first boss (15) and the second boss (25) are removed.

11. The method for manufacturing a gas storage structure according to claim 10, characterized in that: Projecting onto the axis of the straight tube section (10), the limit plate (40) and the first step surface (12), the second step surface (13), the third step surface (22), the fourth step surface (23), the first slope surface (14) and the second slope surface (24) do not intersect.

12. The method for manufacturing a gas storage structure according to claim 10, characterized in that: In the step of welding the first step surface (12) and the third step surface (22), the second step surface (13) and the fourth step surface (23), and the first slope surface (14) and the second slope surface (24), a first welder (51) and a second welder (52) are used. The first welder (51) is arranged corresponding to the second step surface (13) and the fourth step surface (23), and welds the second step surface (13) and the fourth step surface (23), and the first step surface (12) and the third step surface (22); The second welder (52) is arranged corresponding to the first slope surface (14) and the second slope surface (24) to weld the first slope surface (14) and the second slope surface (24).

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