Double-skin thin-walled pressurized column member

Abstract

This invention relates to the field of civil engineering technology, and provides a double-layer thin-walled pressurized column component, comprising an outer column shell, an inner cylinder, and a pressurization container. The outer column shell has a hollow structure; the inner cylinder is a cylindrical structure with open ends, disposed inside the outer column shell, with its axis parallel to the axis of the outer column shell, and a gap between the outer side wall of the inner cylinder and the inner side wall of the outer column shell; the pressurization container is disposed inside the inner cylinder, and is used to fill a pressure medium and expands and deforms as the internal pressure of the pressure medium increases, thereby generating compressive force on both ends of the outer column shell. This design solves the problems in related technologies where pressure-bearing components are prone to bending or buckling instability when bearing external pressure, and the low material utilization efficiency caused by the cylinder wall of the pressure-bearing component simultaneously bearing axial and circumferential stresses.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to a double-layer thin-walled pressurized column component. Background Technology

[0002] Compression members are ubiquitous in building structures, primarily bearing vertical compressive loads. With the development of modern architecture towards larger spans, higher heights, and lighter weights, higher demands are placed on the load-bearing capacity, material utilization efficiency, and structural economy of compression members. High-strength materials such as steel possess high tensile strength and modulus of elasticity, theoretically capable of significantly improving the load-bearing capacity of compression members. However, in practical applications, the load-bearing capacity of compression members is often not controlled by material strength but rather by stability issues, making it difficult for material strength to fully play its role. When the slenderness ratio of a compression member is large, it is prone to overall bending instability under axial compression. Furthermore, for thin-walled compression members, local buckling is more likely to occur under axial compression.

[0003] Considering the aforementioned issues of overall and local stability, existing technologies often increase the cross-sectional dimensions or wall thickness when designing compression members to improve stability. This not only increases material usage and the self-weight of the compression member, reducing structural economy, but also, since the cylinder wall of existing compression members simultaneously bears axial and circumferential stresses, the strength potential of high-strength materials cannot be fully utilized, resulting in low material strength utilization efficiency and hindering the widespread application of high-strength materials in compression members.

[0004] Therefore, how to solve the problem that the compression members in the related technology are prone to bending instability or buckling instability when bearing external pressure, and the low material utilization efficiency caused by the cylinder wall of the compression member bearing both axial stress and circumferential stress, has become an important technical problem to be solved by those skilled in the art. Summary of the Invention

[0005] This invention provides a double-layer thin-walled pressurized column component to solve the defects in related technologies where the pressurized component is prone to bending or buckling instability when bearing external pressure, and the cylindrical wall of the pressurized component is subjected to both axial and circumferential stresses, resulting in low material utilization efficiency.

[0006] This invention provides a double-layer thin-walled pressurized column component, comprising: An outer cylindrical shell, wherein the outer cylindrical shell has a hollow structure; The inner cylindrical body has a cylindrical structure with open ends. The inner cylindrical body is disposed inside the outer cylindrical shell. The axis of the inner cylindrical body is parallel to the axis of the outer cylindrical shell. There is a gap between the outer side wall of the inner cylindrical body and the inner side wall of the outer cylindrical shell. A pressurizing container is disposed inside the inner cylinder. The pressurizing container is used to fill a pressure medium and expand and deform as the internal pressure of the pressure medium increases, so as to generate extrusion force on both ends of the outer cylindrical shell.

[0007] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein the inner cylinder is made of fiber-reinforced composite material; The inner cylindrical body includes: A fiber layup, wherein the fiber layup is formed by circumferentially winding fiber bundles impregnated with resin material.

[0008] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein the outer column shell comprises: The outer cylindrical body has a cylindrical structure with at least one open end; End caps, one of the end caps is provided at each open end of the outer cylinder; A connecting assembly for connecting the end cap to the open end of the outer cylinder.

[0009] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein the outer cylinder is a cylindrical structure with open ends, and two end caps are provided, the two end caps being connected to the two open ends of the outer cylinder respectively.

[0010] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein a positioning groove is provided on the side of the end cap facing the pressurized container, and positioning portions are formed at both ends of the pressurized container, wherein the positioning portions are capable of being located in the positioning groove and the positioning portions are in harmony with the positioning groove.

[0011] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein the sidewall of the positioning groove and the sidewall of the positioning part both include spherical pieces, the center of the spherical piece of the positioning groove is located on the central axis of the outer cylinder, and the center of the spherical piece of the positioning part is located on the central axis of the pressurized container.

[0012] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein the end cap is at least partially located inside the outer cylinder, and the end face of the inner cylinder is in contact with the end face of the end cap.

[0013] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein the pressurized container comprises: airbags; A pressurizing valve is provided on the airbag and is used to allow the pressure medium to enter and exit the airbag. The end cap is provided with a mounting through hole, and the pressurizing valve is disposed in the mounting through hole.

[0014] According to the present invention, a double-layer thin-walled pressurized column component is provided, wherein at least one set of first connecting holes is provided at the end of the outer cylinder, and each set of first connecting holes is distributed at intervals along the circumference of the outer cylinder, and the axis of the first connecting hole is perpendicular to the axis of the outer cylinder. The end cap includes: A first cover is disposed inside the open end of the outer cylinder. The first cover is provided with a second connecting hole, which corresponds one-to-one with the first connecting hole. A pressure plate is arranged around the open end of the outer cylinder. The pressure plate is provided with a third connecting hole, which corresponds one-to-one with the first connecting hole. The connection assembly includes a first connector, each first connection hole corresponds to one first connector, the first connector passes through the third connection hole and the first connection hole and is connected to the second connection hole.

[0015] According to the present invention, a double-layer thin-walled pressurized column component is provided at the end of the outer cylinder, and at least one set of fourth connecting holes are provided on the first flange. Each set of fourth connecting holes is distributed at intervals along the circumference of the outer cylinder, and the axis of the fourth connecting hole is parallel to the axis of the outer cylinder. The end cap includes: The second cover has a first end located inside the open end of the outer cylinder. The second end of the second cover is provided with a second flange. The second flange is provided with a fifth connecting hole, which corresponds one-to-one with the fourth connecting hole. The connection assembly includes a second connector and a fastener. Each fourth connection hole corresponds to one second connector. The second connector passes through the fifth connection hole and the fourth connection hole and is connected to the fastener.

[0016] According to the present invention, the maximum internal pressure of the pressure medium in the pressurization container is determined by the tensile yield strength of the outer shell material, the cross-sectional area of ​​the outer shell, the mid-diameter radius of the inner cylinder, the inner diameter of the inner cylinder, the wall thickness of the inner cylinder, the circumferential tensile strength of the inner cylinder, and the overall instability bearing capacity of the outer shell.

[0017] The present invention provides a double-layer thin-walled pressurized column component, comprising an outer column shell, an inner cylinder, and a pressurized container. The outer column shell has a hollow structure, and the inner cylinder is disposed inside the outer column shell, with the axis of the inner cylinder parallel to the axis of the outer column shell. The pressurized container is used to fill the pressure medium and expands and deforms as the internal pressure of the pressure medium increases. The inner cylinder has a cylindrical structure with open ends, and the pressurized container is disposed inside the inner cylinder. When the pressurized container expands and deforms, it contacts the inner wall of the inner cylinder while simultaneously expanding and deforming along the axial direction of the inner cylinder and the outer column shell. When the pressurized container expands and deforms until its axial dimension matches that of the inner cylinder, the internal pressure of the pressure medium inside the pressurized container is further increased, and the pressurized container continues to expand and deform, with both ends of the pressurized container extending out from the open ends of the inner cylinder. The outer cylindrical shell has two end faces. After the two ends of the pressurized container extend from the open ends of the inner cylinder, they contact the end faces of the outer cylindrical shell, generating compressive force. This compressive force increases with the internal pressure of the pressurized medium within the pressurized container. The compressive force exerted by the two ends of the pressurized container on the end faces of the outer cylindrical shell constitutes a tensile force along the axial direction of the outer cylindrical shell, placing it in a pre-stretched state. When an external axial pressure load acts on the double-layered thin-walled pressurized column component, this axial pressure load must first counteract the pre-tension force generated by the outer cylindrical shell before it can enter a compressed state. As long as the axial pressure load acting on the double-layered thin-walled pressurized column component does not exceed the pre-tension force generated by the outer cylindrical shell, the outer cylindrical shell remains in a tensile or zero-stress state throughout the entire load-bearing process of the double-layered thin-walled pressurized column component. Furthermore, there is a gap between the outer wall of the inner cylinder and the inner wall of the outer shell, so the circumferential pressure generated by the expansion of the pressurized container on the inner cylinder will not act on the side wall of the outer shell. In other words, during the entire load-bearing process of the double-layer thin-walled pressurized column component, the outer shell only bears tensile force along its own axis, which can effectively avoid the outer shell being compressed. This avoids bending or buckling instability caused by compression, and solves the problem in related technologies where the compressed component is prone to bending or buckling instability under pressure, and the low material utilization efficiency caused by the cylinder wall of the compressed component bearing both axial and circumferential stress.

[0018] In addition, the outer shell, inner cylinder and pressurization container of the double-layer thin-walled pressurized column component have clear division of labor. The outer shell is mainly used to bear axial force, and the inner cylinder is mainly used to bear circumferential force, which realizes the separation of stress in each direction. The functional separation of the inner cylinder and the outer shell makes the force path of the double-layer thin-walled pressurized column component clear.

[0019] The inner cylinder is made of fiber-reinforced composite material, which can effectively resist the circumferential tensile stress caused by the internal pressure of the pressurized container. The inner cylinder can be designed as a thin-walled structure with a large diameter-to-thickness ratio. This not only reduces the overall weight of the double-layer thin-walled pressurized column component while meeting the pressure requirements, but also improves the material utilization efficiency, laying the foundation for the entire double-layer thin-walled pressurized column component to achieve the goal of high load-bearing capacity and high stability.

[0020] The inner cylinder of the fiber-reinforced composite material is formed by circumferentially winding carbon fiber bundles. This ensures that the fiber arrangement direction is consistent with the circumferential stress direction generated by the inner cylinder when it is subjected to the expansion pressure of the pressurized container. This fully utilizes the high tensile strength of the fiber-reinforced composite material along the fiber direction, improves material utilization efficiency, and thus efficiently withstands and constrains the expansion force from the internal pressurized container.

[0021] The pressure vessel and the end cap of the outer cylindrical shell are connected by a positioning part and a positioning groove. This avoids the problem of the outer wall of the inner cylinder contacting the inner wall of the outer cylindrical shell due to the deviation of the central axis of the inner cylinder from the central axis of the outer cylindrical shell, thus preventing the inner cylinder from exerting a force on the outer cylindrical shell. It ensures that the force exerted by the pressure vessel on the end cap is parallel to the axis of the outer cylinder, avoiding additional bending moments that may arise from eccentric contact between the positioning part and the positioning groove. This simplifies the internal stress state of the double-layer thin-walled pressure column component and ensures that the expansion force generated by the pressure vessel is applied to the end of the outer cylindrical shell as a pure, non-eccentric axial force. This fundamentally guarantees that the initial stress state of the entire double-layer thin-walled pressure column component is an ideal axial stress, which helps to suppress overall bending instability of the double-layer thin-walled pressure column component and maximizes its load-bearing capacity and stability. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the double-layer thin-walled pressurized column component provided by the present invention from one perspective.

[0024] Figure 2 This is a structural schematic diagram of the double-layer thin-walled pressurized column component provided by the present invention from another perspective.

[0025] Figure 3 This is an exploded view of the double-layer thin-walled pressurized column component provided by the present invention.

[0026] Figure 4 This is a schematic diagram showing the relative positions of the inner and outer cylinders after the pressurized container provided by the present invention has expanded and deformed.

[0027] Figure 5 This is a schematic diagram of a connection structure between the end cap and the outer cylinder provided by the present invention.

[0028] Figure 6 This is a cross-sectional view of a connection structure between the end cap and the outer cylinder provided by the present invention.

[0029] Figure 7 This is a schematic diagram of another connection structure between the end cap and the outer cylinder provided by the present invention.

[0030] Figure 8 This is a cross-sectional view of another connection structure between the end cap and the outer cylinder provided by the present invention.

[0031] Figure 9 This is a schematic diagram of the winding direction of fiber bundles in the fiber layup of the inner cylinder provided by the present invention.

[0032] Figure label: 1. Inner cylinder; 2. Pressurized container; 3. Outer cylinder; 4. End cap; 5. Positioning groove; 6. Positioning part; 7. First connecting hole; 8. First cover; 9. Second connecting hole; 10. Pressure plate; 11. Third connecting hole; 12. First connector; 13. First flange; 14. Second cover; 15. Second flange; 16. Second connector; 17. Fastener; 18. Mounting through hole. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0034] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0036] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The following is combined Figures 1 to 9 The present invention describes a double-layer thin-walled pressurized column component.

[0039] like Figures 1 to 9 As shown, the double-layer thin-walled pressurized column component provided in this embodiment of the invention includes an outer column shell, an inner cylinder 1, and a pressurized container 2.

[0040] Specifically, the outer cylindrical shell has a hollow structure, and the inner cylindrical body 1 is set inside the outer cylindrical shell, with the axis of the inner cylindrical body 1 being parallel to the axis of the outer cylindrical shell.

[0041] The pressurized container 2 is used to fill high-pressure gas or liquid and other pressure media and expands and deforms as the internal pressure of the pressure media increases.

[0042] The inner cylinder 1 has a cylindrical structure with open ends, and the pressurization container 2 is located inside the inner cylinder 1. When the pressurization container 2 expands and deforms, it will expand and deform along the axial direction of the inner cylinder 1 and the outer cylindrical shell at the same time as it contacts the inner wall of the inner cylinder 1.

[0043] When the pressure vessel 2 expands and deforms until its axial dimension matches that of the inner cylinder 1, the internal pressure of the pressure medium inside the pressure vessel 2 continues to increase, and the pressure vessel 2 continues to expand and deform, with both ends of the pressure vessel 2 extending out from the two ends of the inner cylinder 1.

[0044] The outer cylindrical shell has two end faces. After the two ends of the pressurizing container 2 extend from the two end openings of the inner cylinder 1, the two ends of the pressurizing container 2 will contact the two end faces of the outer cylindrical shell and generate extrusion pressure. Moreover, as the expansion pressure of the pressure medium inside the pressurizing container 2 increases, the extrusion pressure between the two ends of the pressurizing container 2 and the two end faces of the outer cylindrical shell will increase.

[0045] The extrusion force exerted by the two ends of the pressurized container 2 on the two end faces of the outer cylindrical shell constitutes a tensile force in the axial direction of the outer cylindrical shell, causing the outer cylindrical shell to be in a pre-stretched state.

[0046] When an external axial pressure load is applied to a double-layer thin-walled pressurized column member, this axial pressure load must first counteract the pre-tension force generated by the outer column shell before the outer column shell can enter the compressed state.

[0047] As long as the axial pressure load acting on the double-layer thin-walled pressurized column component does not exceed the pre-tension force generated by the outer column shell, the outer column shell will always remain in a state of tension or zero stress during the entire bearing process of the double-layer thin-walled pressurized column component, and will be mainly pressured by the pressure medium in the pressurization container 2.

[0048] Furthermore, there is a gap between the outer wall of the inner cylinder 1 and the inner wall of the outer cylindrical shell, so the circumferential pressure generated by the expansion of the pressurized container 2 on the inner cylinder 1 will not act on the side wall of the outer cylindrical shell.

[0049] In other words, during the entire load-bearing process of the double-layer thin-walled pressurized column component, the outer shell only bears tensile force along its own axis, which can effectively avoid the outer shell being compressed. This can prevent the outer shell from bending or buckling instability due to compression, thus solving the problem in related technologies where the compressed component is prone to bending or buckling instability when bearing pressure, and the low material utilization efficiency caused by the cylinder wall of the compressed component bearing both axial and circumferential stress.

[0050] In this embodiment, the outer shell, inner cylinder 1, and pressurization container 2 of the double-layer thin-walled pressurization column component have clearly defined functions.

[0051] Among them, the pressurization container 2, combined with the pressure medium inside it, is the power source for generating preload, and the magnitude of its internal pressure directly determines the compressive bearing capacity of the double-layer thin-walled pressurization column component.

[0052] The inner cylinder 1 needs to have high circumferential tensile strength, mainly to withstand the circumferential pressure generated by the expansion of the pressurized container 2, and to prevent the outer cylinder shell from undergoing radial deformation due to the pressure of the pressurized container 2 acting directly on the outer cylinder shell.

[0053] The outer shell, through the pre-tension applied by the pressurized container 2, becomes the main anti-instability structure and provides bending stiffness and overall stability for the entire double-layer thin-walled pressurized column component.

[0054] In this way, the functions of the inner cylinder 1 and the outer column shell are separated, making the force path of the double-layer thin-walled pressurized column component clear. By generating pre-tension through internal pressurization, the outer column shell is transformed from a compression member to a tension member. By utilizing the material's characteristic of being resistant to tension but not to compressive buckling, the technical problem of traditional compression members being prone to instability under pressure is solved.

[0055] In this embodiment of the invention, the inner cylinder 1 is made of fiber-reinforced composite material.

[0056] Fiber-reinforced composite materials possess excellent properties of being lightweight and high-strength. In this embodiment of the invention, the main function of the inner cylinder 1 is to withstand the pressure generated by the expansion and deformation of the internal pressurized container 2 after it is filled with a pressurized medium. The fiber-reinforced composite material has extremely high tensile strength, which can effectively resist the pressure generated by the pressurized container 2, thereby ensuring the stability and safety of the double-layer thin-walled pressurized column component.

[0057] Moreover, due to the high strength characteristics of fiber-reinforced composite materials, the inner cylinder 1 can be designed as a thin-walled structure with a large diameter-to-thickness ratio. This not only reduces the overall weight of the double-layer thin-walled pressurized column component while meeting the pressure requirements, but also improves the material utilization efficiency, laying the foundation for the entire double-layer thin-walled pressurized column component to achieve the goal of high load-bearing capacity and high stability.

[0058] In this embodiment, the inner cylinder 1 includes a fiber layup, which is formed by circumferentially winding fiber bundles impregnated with resin material, such as... Figure 9 As shown.

[0059] Specifically, the fiber bundles are thoroughly impregnated in a resin bath to ensure that each tiny fiber surface is uniformly covered with liquid resin. Then, the resin-impregnated fiber bundles, under tension, are wound onto a cylindrical mandrel. By adjusting the relative position of the fiber bundles and the cylindrical mandrel along the mandrel's axis, the fiber bundles can be evenly wound at different positions on the mandrel, and can be layered and stacked on the mandrel. Winding is stopped when the thickness of the fiber bundles on the cylindrical mandrel reaches the target wall thickness of the inner cylinder 1. Then, curing and demolding are performed to obtain the fiber-reinforced composite inner cylinder 1.

[0060] This configuration utilizes circumferential winding of fiber bundles, ensuring that the fiber arrangement direction aligns with the circumferential stress direction generated when the inner cylinder 1 bears the internal pressure of the pressurized container 2. This fully leverages the high tensile strength of the fiber bundles, improves material utilization efficiency, and effectively withstands and constrains the expansion force from the internal pressurized container 2.

[0061] In some preferred embodiments of the present invention, carbon fiber bundles are selected as the fiber bundles for fiber layup.

[0062] Carbon fiber materials possess excellent physical properties such as high strength and lightweight. By using carbon fiber tow to make the inner cylinder 1, without increasing the wall thickness and weight of the inner cylinder 1, it is possible to ensure that the inner cylinder 1 has sufficient circumferential tensile strength and stiffness, thereby reliably withstanding the high pressure load generated by the pressurization container 2 and preventing the inner cylinder 1 from rupturing and failing.

[0063] This design not only ensures the structural integrity and safety of the entire double-layer thin-walled pressurized column component, but also achieves the lightweighting of the double-layer thin-walled pressurized column component.

[0064] In this embodiment of the invention, the maximum internal pressure of the pressure medium in the pressurized container 2 is determined based on the tensile yield strength of the outer shell material, the cross-sectional area of ​​the outer shell, the mid-diameter radius of the inner cylinder 1, the inner diameter of the inner cylinder 1, the wall thickness of the inner cylinder 1, the circumferential tensile strength of the inner cylinder 1, and the overall instability bearing capacity of the outer shell.

[0065] By combining the three factors of the tensile yield strength of the outer shell material, the cross-sectional area of ​​the outer shell, and the inner diameter of the inner cylinder 1, the maximum internal pressure of the pressure medium in the pressurization container 2, which is allowed by the tensile yield strength of the outer shell material, can be determined, ensuring that the force generated by the pressurization container 2 keeps the outer shell in a pre-stretched state and prevents the outer shell from being damaged.

[0066] By combining the mean radius of the inner cylinder 1, the wall thickness of the inner cylinder 1, and the circumferential tensile strength of the inner cylinder 1, the maximum internal pressure of the pressure medium inside the pressurized container 2 that allows the circumferential tensile strength of the inner cylinder 1 can be determined, ensuring that the inner cylinder 1 can reliably withstand the force generated by the pressurized container 2 without circumferential failure.

[0067] By combining the inner diameter of the inner cylinder 1 and the overall instability bearing capacity of the outer cylindrical shell, the maximum internal pressure of the pressure medium inside the pressurized container 2 can be determined by the overall instability bearing capacity of the outer cylindrical shell.

[0068] Based on the above-determined maximum internal pressure of the pressure medium in the pressurized container 2, which is allowed by the tensile yield strength of the outer shell material, the maximum internal pressure of the pressure medium in the pressurized container 2, which is allowed by the circumferential tensile strength of the inner cylinder 1, and the maximum internal pressure of the pressure medium in the pressurized container 2, which is allowed by the overall instability bearing capacity of the outer shell, the minimum value among these is taken as the maximum internal pressure of the pressure medium in the pressurized container 2 allowed by the double-layer thin-walled pressurized column component.

[0069] Specifically, the internal pressure of the pressure medium inside the pressurization container 2 is p The tensile yield strength of the outer cylindrical shell material is f s The cross-sectional area of ​​the outer cylindrical shell is A s The mid-diameter radius of the inner cylinder 1 is r c The inner diameter of the inner cylinder 1 is r a Correspondingly, the maximum cross-sectional area of ​​the pressurization container 2 during pressurization is A a , The wall thickness of the inner cylinder 1 is t c The circumferential tensile strength of the inner cylinder 1 is f ct The overall instability bearing capacity of the outer column shell is N s The maximum allowable internal pressure of the pressure medium within the pressurization vessel 2 of the double-layer thin-walled pressurization column component is: p max , .

[0070] Correspondingly, the maximum axial load that a double-layer thin-walled pressurized column member can withstand is N max , .

[0071] When a double-layer thin-walled pressurized column component is subjected to axial load, the axial load is mainly transmitted through the force system formed by the pressure medium and the outer column shell. Since the outer column shell has already formed an axial preload during the pressurization stage of the pressurization vessel 2, in the subsequent axial compression stage, if the axial load does not exceed the maximum axial load that the double-layer thin-walled pressurized column component can withstand... N max During this process, the outer cylindrical shell remains under tensile stress, preventing axial buckling instability. The inner cylinder 1 primarily bears the circumferential pressure generated by the pressurized medium, while the outer cylindrical shell provides bending stiffness and overall stability restraint.

[0072] In this embodiment of the invention, the outer cylindrical shell includes an outer cylindrical body 3, an end cap 4, and a connecting assembly.

[0073] Specifically, the outer cylinder 3 has a cylindrical structure with at least one open end. The cylindrical structure not only provides a space for the inner cylinder 1 and the pressurization container 2, but also provides the main bending stiffness and overall stability constraint for the entire double-layer thin-walled pressurization column component.

[0074] The open end of the outer cylinder 3 facilitates the installation of the inner cylinder 1 and the pressurization container 2 inside the outer cylinder 3. Each open end of the outer cylinder 3 is provided with an end cap 4, which is used to close the end opening of the outer cylinder 3 and directly bears the axial thrust generated by the expansion of the pressurization container 2. It is a key link in the force transmission path.

[0075] The connecting assembly is used to connect the end cap 4 to the open end of the outer cylinder 3. The axial thrust borne by the end cap 4 can be transferred to the outer cylinder 3 through the connecting assembly.

[0076] Thus, the outer cylinder 3, end cap 4, and connecting components together form a stable axial constraint and force system, which is used to convert the internal pressure into the preload of the outer cylinder 3.

[0077] In a specific embodiment, the outer cylindrical body 3 has a cylindrical structure with open ends, and two end caps 4 are provided, which are connected to the two open ends of the outer cylindrical body 3 respectively. Figures 1 to 3 As shown.

[0078] When the pressurized container 2 expands, it exerts a thrust on the two end caps 4 along the axial direction of the outer cylinder 3. Both end caps 4 are connected to the outer cylinder 3 through a connecting assembly. The connecting assembly can transfer the axial thrust acting on the two end caps 4 to both ends of the outer cylinder 3, thereby generating axial prestress in the outer cylinder 3.

[0079] In a further embodiment, a positioning groove 5 is provided on the side of the end cap 4 facing the pressurized container 2, and positioning parts 6 are formed at both ends of the pressurized container 2. The positioning parts 6 can be located in the positioning groove 5, and the positioning parts 6 match the positioning groove 5.

[0080] The positioning part 6 and the positioning groove 5 work together to position the pressurized container 2. During the expansion and deformation of the pressurized container 2, the central axis of the pressurized container 2 coincides with the central axis of the outer cylindrical shell, which in turn makes the central axis of the inner cylindrical body 1 coincide with the central axis of the outer cylindrical shell. This avoids the problem of the outer wall of the inner cylindrical body 1 contacting the inner wall of the outer cylindrical shell due to the deviation of the central axis of the pressurized container 2 relative to the central axis of the outer cylindrical shell, and prevents the inner cylindrical body 1 from exerting a force on the outer cylindrical shell.

[0081] Moreover, it can ensure that the extrusion force generated by the pressurized container 2 during expansion and deformation can be uniformly transmitted to the two end caps 4 along the axial direction, thereby enabling the outer column shell to obtain a uniformly distributed axial preload, effectively avoiding additional bending moment due to eccentric force, which is conducive to improving the structural stability and load-bearing performance reliability of the entire double-layer thin-walled pressurized column component.

[0082] In some preferred embodiments of the present invention, the positioning groove 5 and the positioning part 6 have the same shape, and the sidewalls of both the positioning groove 5 and the positioning part 6 include spherical pieces. Specifically, the sidewalls of the positioning groove 5 and the positioning part 6 can be configured as hemispherical, spherical cap, or a combination of spherical and planar surfaces. After the pressurized container 2 expands, the positioning part 6 is located inside the positioning groove 5, and the two are in spherical contact, forming a spherical contact force transmission interface with a large contact area.

[0083] According to the principles of mechanics, the resultant force of pressure acting on a spherical surface must pass through the center of the sphere. In other words, the resultant force of the force exerted by the positioning part 6 of the pressurized container 2 on the positioning groove 5 of the end cap 4 passes through the center of the spherical surface, such as the spherical crown or hemisphere.

[0084] Moreover, even if there is a slight angular deviation between the pressurized container 2 and the end cap 4, the force between them will always pass through the center of the ball.

[0085] The center of the spherical plate corresponding to the positioning groove 5 is located on the central axis of the outer cylinder 3, and the center of the spherical plate corresponding to the positioning part 6 is located on the central axis of the pressurizing container 2. This ensures that the force exerted by the pressurizing container 2 on the end cap 4 is parallel to the axis of the outer cylinder 3, avoiding the additional bending moment that may be generated due to the eccentric contact between the positioning part 6 and the positioning groove 5. This simplifies the internal stress state of the double-layer thin-walled pressurizing column component and ensures that the expansion force generated by the pressurizing container 2 can be applied to the end of the outer column shell as a pure, non-eccentric axial force. This fundamentally ensures that the initial stress state of the entire double-layer thin-walled pressurizing column component is an ideal axial stress, which helps to suppress the overall bending instability of the double-layer thin-walled pressurizing column component and maximizes its load-bearing capacity and stability.

[0086] In this embodiment, the end cap 4 is at least partially located inside the outer cylinder 3. When the pressurized container 2 is not expanded or deformed, the end face of the inner cylinder 1 is in contact with the end face of the end cap 4. It should be noted that the inner cylinder 1 is not connected to the outer cylinder shell at any point; that is, the inner cylinder 1 is not connected to the outer cylinder 3, nor is the inner cylinder 1 connected to the end cap 4.

[0087] When the outer cylinder 3 is subjected to pre-tension, the gap between the end face of the inner cylinder 1 and the end face of the end cap 4 can be minimized as much as possible, so that the pressurizing container 2 is completely constrained within the space enclosed by the inner cylinder 1 and the two end caps 4. This can prevent the pressurizing container 2 from being squeezed into the gap between the end faces of the inner cylinder 1 and the end cap 4 or from contacting the outer cylinder 3 due to deformation during expansion and deformation. This ensures that the force generated by the pressurizing container 2 is only applied to the end cap 4 and the inner cylinder 1, and will not produce an unexpected direct force on the outer cylinder 3.

[0088] This design helps to ensure the clarity and uniqueness of the force transmission path, which is the key to applying precise and stable pre-tension force to the outer cylinder 3, thereby ensuring the working performance and structural stability of the entire double-layer thin-walled pressurized column component.

[0089] There are various forms of mating structures between the outer cylinder 3 and the end cap 4, and correspondingly, there are also various structures for the connecting components.

[0090] In some embodiments of the present invention, at least one set of first connecting holes 7 are provided at the end of the outer cylinder 3, and the axis of the first connecting holes 7 is perpendicular to the axis of the outer cylinder 3, such as... Figure 5 and Figure 6 As shown, each group of first connecting holes 7 is distributed circumferentially along the outer cylinder 3, and each group of first connecting holes 7 is distributed axially along the outer cylinder 3.

[0091] At this time, the end cap 4 includes a first cover body 8 and a pressure plate 10.

[0092] The first cover 8 is disposed inside the open end of the outer cylinder 3. The first cover 8 can directly withstand the axial thrust from the pressurized container 2. The aforementioned positioning groove 5 is disposed in the first cover 8.

[0093] The first cover 8 is provided with a second connecting hole 9, which corresponds one-to-one with the first connecting hole 7, so as to ensure that the first cover 8 and the outer cylinder 3 can be connected at various positions in the circumference.

[0094] The pressure plate 10 is annular and is arranged around the open end of the outer cylinder 3. The pressure plate 10 is provided with a third connecting hole 11, which corresponds one-to-one with the first connecting hole 7, to ensure that the pressure plate 10 and the outer cylinder 3 can be connected at various positions in the circumference.

[0095] The pressure plate 10 provides a strong locking force to the outside of the outer cylinder 3 to cooperate with the first cover 8 and firmly clamp and fix the end of the outer cylinder 3. The first cover 8, the outer cylinder 3 and the pressure plate 10 are tightly fixed into a whole, forming a reliable end axial constraint system.

[0096] Moreover, this split structure with internal and external components clearly separates the functions of internal pressure bearing and external locking, which not only facilitates installation and disassembly but also ensures connection strength and structural stability of the outer cylinder 3.

[0097] The connecting component includes a first connector 12, with each first connecting hole 7 corresponding to a first connector 12. The first connector 12 passes through the third connecting hole 11 and the first connecting hole 7 and is connected to the second connecting hole 9.

[0098] Specifically, the first connector 12 can be a bolt, the second connecting hole 9 is a threaded hole, and the first connecting hole 7 and the third connecting hole 11 are smooth holes. After the first connector 12 passes through the third connecting hole 11 on the pressure plate 10 and the first connecting hole 7 on the outer cylinder 3 in sequence, it can be threadedly connected to the second connecting hole 9 of the first cover 8.

[0099] The end cap 4 can be connected to the outer cylinder 3 by screwing on the first connector 12, which is simple and convenient.

[0100] In other embodiments of the present invention, a first flange 13 is provided at the end of the outer cylinder 3, and at least one set of fourth connecting holes are provided on the first flange 13. The axis of the fourth connecting holes is parallel to the axis of the outer cylinder 3, such as... Figure 7 and Figure 8 As shown, the fourth connecting holes in each group are distributed at intervals along the circumference of the outer cylinder 3.

[0101] The first flange 13 provides a robust and standardized end connection interface for the outer cylinder 3, while the design of the fourth connection hole being distributed circumferentially ensures the uniform transmission of connection force.

[0102] At this time, the end cap 4 includes a second cover body 14. The first end of the second cover body 14 is located inside the open end of the outer cylinder 3. The second end of the second cover body 14 is provided with a second flange 15. The second flange 15 is provided with a fifth connecting hole, which corresponds one-to-one with the fourth connecting hole.

[0103] The design of the second cover 14 being partially placed inside the outer cylinder 3 facilitates alignment and positioning during installation. The second flange 15 at the end of the second cover 14 and the fifth connecting hole, which precisely corresponds to the fourth connecting hole of the outer cylinder 3, constitute a key structure for bearing internal pressure and transmitting it outward.

[0104] The connection assembly includes a second connector 16 and a fastener 17. Each fourth connection hole corresponds to a second connector 16. The second connector 16 passes through the fifth connection hole and the fourth connection hole and is connected to the fastener 17.

[0105] Specifically, the second connector 16 can be a bolt, the fastener 17 can be a nut, and the fourth and fifth connecting holes are plain holes. The second connector 16 passes through the fourth connecting hole on the first flange 13 and the fifth connecting hole on the second flange 15 in sequence, and is then tightened with the nut.

[0106] Each second connector 16 can be equipped with two nuts, using the double nut locking principle to prevent the second connector 16 from loosening.

[0107] The pressure medium inside the pressurized container 2 can be either gas or liquid.

[0108] In this embodiment of the invention, gas is selected as the pressure medium. Both the outer shell and the inner cylinder 1 of the double-layer thin-walled pressurized column component are hollow structures filled with gas, resulting in a lightweight double-layer thin-walled pressurized column component. Furthermore, the use of fiber-reinforced composite material, a lightweight material, for the inner cylinder 1 further facilitates the lightweight design of the double-layer thin-walled pressurized column component. Therefore, the double-layer thin-walled pressurized column component provided in this embodiment has the advantages of being lightweight and high-strength.

[0109] At this time, the pressurization container 2 includes an air bladder and a pressurization valve.

[0110] A pressurization valve is installed in the airbag, which is used to allow the pressurized medium to enter and exit the airbag. The pressurization valve is connected to an external inflation / deflation device, which can be used to inflate or deflate the airbag according to actual needs. This allows for flexible control and precise adjustment of the preload applied to the outer shell, thereby achieving the purpose of actively regulating the overall mechanical properties of the double-layer thin-walled pressurized column component.

[0111] The end cap 4 is provided with a mounting through hole 18, and the pressurization valve is located in the mounting through hole 18. The pressurization valve is exposed, which facilitates the connection between the pressurization valve and the external inflation / deflation device, making the pressurization and maintenance operations simple and quick, and improving the convenience of the double-layer thin-walled pressurization column component during installation and use.

[0112] The airbags mentioned above can be made of, but are not limited to, rubber.

[0113] In this embodiment of the invention, the cross-sectional shape of the outer cylindrical shell and the cross-sectional shape of the inner cylindrical body 1 are both circular or polygonal.

[0114] When the cross-sectional shape of the outer shell is circular, the double-layer thin-walled pressurized column component is cylindrical.

[0115] When the cross-sectional shape of the outer shell is polygonal, the double-layer thin-walled pressurized column component is a multi-faceted prism. Specifically, the polygon can be a triangle, rectangle, hexagon, etc., and correspondingly, the double-layer thin-walled pressurized column component can be a triangular prism, a square prism, a hexagonal prism, etc.

[0116] In this embodiment, the outer cylindrical shell is made of metals such as steel or aluminum.

[0117] Both steel and aluminum have excellent strength and high elastic modulus, which enables the outer column shell to effectively withstand high preload and stably store this preload as tensile strain energy, providing a solid foundation for bearing external axial pressure and avoiding instability of double-layer thin-walled pressurized column components.

[0118] Moreover, the high stiffness of steel and aluminum provides the necessary bending resistance and overall stability for the entire double-layer thin-walled pressurized column component.

[0119] In addition, steel is inexpensive and has mature processing technology, making it highly economical. Aluminum, with its outstanding advantages of being lightweight and high-strength, can significantly reduce the self-weight of double-layer thin-walled pressurized column components while meeting load-bearing requirements.

[0120] When assembling the double-layer thin-walled pressurized column component provided in this embodiment of the invention, firstly, the positioning part 6 at one end of the pressurized container 2 is engaged with the positioning groove 5 of one of the end caps 4. Then, the inner cylinder 1 is fitted onto the outside of the pressurized container 2, and the outer cylinder 3 is fitted onto the outside of the inner cylinder 1. Then, the positioning groove 5 of the other end cap 4 is engaged with the positioning part 6 at the other end of the pressurized container 2, and the end cap 4 is installed on the outer cylinder 3. The two ends of the outer cylinder 3 and the two end caps 4 are fastened together using a connecting assembly. The pressurization valve is connected to an external inflation / deflation device, and the pressurized medium is injected into the pressurized container 2 using the inflation / deflation device until the internal pressure of the pressurized medium in the pressurized container 2 reaches the required value.

[0121] In summary, the double-layer thin-walled pressurized column component provided by the embodiments of the present invention has the advantages of bearing pressure from gas or liquid pressure media, being lightweight and high-strength, and having high material utilization efficiency.

[0122] Specifically, the double-layer thin-walled pressurized column component bears the pressure of the internal pressure medium through the inner cylinder 1 of fiber-reinforced composite material. During the pressurization process, the outer cylinder 3 is stretched to store internal force. When subjected to axial load, the tension of the outer cylinder 3 is gradually released, so as to realize the pressure medium bearing and reduce the self-weight of the double-layer thin-walled pressurized column component.

[0123] The axial and circumferential forces of the double-layer thin-walled pressurized column component are borne by the outer cylinder 3 and the inner cylinder 1, respectively. When the double-layer thin-walled pressurized column component is pressurized and subjected to axial load, the inner cylinder 1 is under circumferential tension and the outer cylinder 3 is under axial tension. Local instability will not occur, and a cross-section with a large diameter-to-thickness ratio can be used. Under the same cross-sectional area, the overall stability can be improved and the material utilization efficiency can be improved.

[0124] During the pressurization and axial load process, the axial stiffness of the double-layer thin-walled pressurized column component is mainly provided by the outer cylinder 3. Under pressurization, a stable composite force system is formed. During the pressurization and axial load process, the overall stiffness of the double-layer thin-walled pressurized column component is stable and the force path is clear, which is conducive to ensuring the stability and predictability of the axial bearing performance of the double-layer thin-walled pressurized column component.

[0125] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-layer thin-walled pressurized column component, characterized in that, include: An outer cylindrical shell, wherein the outer cylindrical shell has a hollow structure; The inner cylinder (1) has a cylindrical structure with open ends. The inner cylinder (1) is located inside the outer cylindrical shell. The axis of the inner cylinder (1) is parallel to the axis of the outer cylindrical shell. There is a gap between the outer side wall of the inner cylinder (1) and the inner side wall of the outer cylindrical shell. A pressurizing container (2) is disposed inside the inner cylinder (1). The pressurizing container (2) is used to fill a pressure medium and expand and deform as the internal pressure of the pressure medium increases, so as to generate extrusion force on both ends of the outer cylindrical shell.

2. The dual-layer thin-walled pressure-filled column member of claim 1, wherein, The inner cylinder (1) is made of fiber-reinforced composite material; The inner cylinder (1) includes: A fiber layup, wherein the fiber layup is formed by circumferentially winding fiber bundles impregnated with resin material.

3. The dual-layer thin-walled pressure-filled column member of claim 1, wherein, The outer cylindrical shell includes: The outer cylindrical body (3) has a cylindrical structure with at least one open end; End cap (4), one end cap (4) is provided at each open end of the outer cylinder (3); A connecting assembly for connecting the end cap (4) to the open end of the outer cylinder (3).

4. A dual skin, thin walled, pressure-filled column member according to claim 3, wherein, The outer cylindrical body (3) has a cylindrical structure with open ends. There are two end caps (4), and the two end caps (4) are connected to the two open ends of the outer cylindrical body (3).

5. A dual skin, thin walled, pressure-filled column member according to claim 4, wherein, The end cap (4) has a positioning groove (5) on the side facing the pressurized container (2), and positioning parts (6) are formed at both ends of the pressurized container (2). The positioning parts (6) can be located in the positioning groove (5) and the positioning parts (6) match the positioning groove (5).

6. The double-layer thin-walled pressurized column component according to claim 5, characterized in that, The sidewalls of the positioning groove (5) and the positioning part (6) both include spherical pieces. The center of the spherical piece of the positioning groove (5) is located on the central axis of the outer cylinder (3), and the center of the spherical piece of the positioning part (6) is located on the central axis of the pressurized container (2).

7. The double-layer thin-walled pressurized column component according to claim 3, characterized in that, The end cap (4) is at least partially located inside the outer cylinder (3), and the end face of the inner cylinder (1) is in contact with the end face of the end cap (4).

8. The dual-layer thin-walled pressure-filled stud member of claim 3, wherein, The pressurized container (2) includes: airbags; A pressurizing valve is provided in the airbag and is used to allow the pressure medium to enter and exit the airbag. The end cap (4) is provided with an installation through hole (18) and the pressurizing valve is provided in the installation through hole (18).

9. The dual-layer thin-walled pressure-filled stud member defined in Claim 3, wherein, The outer cylinder (3) is provided with at least one set of first connecting holes (7) at its end. Each set of first connecting holes (7) is distributed at intervals along the circumference of the outer cylinder (3), and the axis of the first connecting holes (7) is perpendicular to the axis of the outer cylinder (3). The end cap (4) includes: The first cover (8) is disposed inside the open end of the outer cylinder (3). The first cover (8) is provided with a second connecting hole (9), which corresponds one-to-one with the first connecting hole (7). Pressure plate (10), the pressure plate (10) is arranged around the open end of the outer cylinder (3), and the pressure plate (10) is provided with a third connecting hole (11), the third connecting hole (11) and the first connecting hole (7) are corresponding one-to-one; The connection assembly includes a first connector (12), each first connection hole (7) corresponds to one first connector (12), the first connector (12) passes through the third connection hole (11) and the first connection hole (7) and is connected to the second connection hole (9).

10. The dual-layer thin-walled pressure-filled stud member defined in Claim 3, wherein, The outer cylinder (3) is provided with a first flange (13) at its end. The first flange (13) is provided with at least one set of fourth connecting holes. Each set of fourth connecting holes is distributed at intervals along the circumference of the outer cylinder (3). The axis of the fourth connecting hole is parallel to the axis of the outer cylinder (3). The end cap (4) includes: The second cover (14) has its first end located inside the open end of the outer cylinder (3). The second end of the second cover (14) is provided with a second flange (15). The second flange (15) is provided with a fifth connecting hole, which corresponds one-to-one with the fourth connecting hole. The connection assembly includes a second connector (16) and a fastener (17), each of the fourth connection holes corresponds to one second connector (16), the second connector (16) passes through the fifth connection hole and the fourth connection hole and is connected to the fastener (17).

11. The double-layer thin-walled pressurized column component according to claim 1, characterized in that, The maximum internal pressure of the pressure medium in the pressurized container (2) is determined based on the tensile yield strength of the outer shell material, the cross-sectional area of ​​the outer shell, the mid-diameter radius of the inner cylinder (1), the inner diameter of the inner cylinder (1), the wall thickness of the inner cylinder (1), the circumferential tensile strength of the inner cylinder (1), and the overall instability bearing capacity of the outer shell.

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