A thin shell structure

Abstract

The utility model relates to steel structure design technical field and discloses a kind of thin shell structure, thin shell structure includes inner shell and outer shell, the outer shell is located the outer periphery of the inner shell and is formed between the inner shell one inner cavity, the inner cavity is used to fill high-pressure content;In the above scheme, when external load acts on the outer shell, make the outer shell have the deformation tendency of inward collapse or buckling, and high-pressure content filled in the inner cavity can exert an outward pressure on the outer shell, this outward internal pressure directly offsets a part of inward compressive stress generated by external load, reduces the compression load that outer shell itself needs to bear, on the other hand, the outer shell mainly plays the role of restraining inner cavity, when the outer shell produces a little deformation tendency of inward concave, it will lead to the volume reduction of inner cavity, and the volume reduction of inner cavity can sharply increase the pressure of inner cavity content, and the increased pressure can generate greater outward thrust, strongly resist this concave deformation, so as to guarantee the structural stability effect of entire thin shell structure, compared with traditional thickening design, it can reduce the burden caused by thickening while ensuring overall structural rigidity.

Description

Technical Field

[0001] This utility model relates to the field of steel structure design technology, and in particular to a thin-shell structure. Background Technology

[0002] In existing technologies, the mainstream solution for stainless steel tanks involved in the transportation of pressure vessels, dangerous goods, hazardous chemicals, and petrochemical products, as well as the pressure hulls of large and medium-sized military submarines, is to use high-strength metal materials (such as special alloy steel) to form single-layer or multi-layer cylindrical shell structures through welding processes. Taking submarines as an example, in order to cope with the exponentially increasing external pressure load brought about by the increase in depth and to ensure that the hull meets the strength and strict fatigue life requirements at the extreme diving depth, the most traditional and widely used technical means is to significantly increase the hull wall thickness.

[0003] However, while this "strength through thickness" design approach is technically mature, it also brings significant drawbacks in engineering applications. Taking submarines as an example, as the design diving depth increases, the wall thickness required to achieve safety needs to be significantly increased. This directly results in an extremely thick and heavy hull structure. On the one hand, material consumption is severe; on the other hand, the large hull volume and mass require a more powerful propulsion system, leading to increased drag and energy consumption, directly affecting range and endurance. At the same time, the excessively thick and heavy hull significantly reduces the submarine's displacement, limiting the tonnage available for other equipment and weakening the submarine's overall combat capability. This "sacrificing lightweight and economy for safety strength" model has become one of the important factors restricting the further development of modern high-performance, deep-diving submarines.

[0004] Therefore, providing a shell structure that can significantly reduce shell mass while having an equal or higher safety margin is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This utility model discloses a thin-shell structure to solve the above-mentioned technical problems existing in related technologies.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] This application provides a thin-shell structure, which includes an inner shell and an outer shell. The outer shell is disposed on the outer periphery of the inner shell and forms an inner cavity between the outer shell and the inner shell. The inner cavity is used to fill high-pressure contents.

[0008] Furthermore, the thin-shell structure also includes a partition connecting the inner shell and the outer shell, the partition serving to divide the inner cavity into multiple unit cavities.

[0009] Alternatively, a plurality of the partitions may be provided extending axially along the inner shell, and the plurality of the partitions may be distributed circumferentially along the inner shell.

[0010] Alternatively, the plurality of partitions may extend circumferentially along the inner shell and may also be distributed axially along the inner shell.

[0011] Alternatively, multiple partitions are staggered between the inner shell and the outer shell to form a cage-like structure.

[0012] Furthermore, the inner shell is provided with a pressure injection port corresponding to the unit cavity.

[0013] Furthermore, the inner shell is formed by bending and welding a one-piece sheet metal, or the inner shell includes multiple inner shell plate units, which are spliced ​​together to form the inner shell.

[0014] Furthermore, the outer shell is formed by bending and welding a one-piece sheet metal, or the outer shell includes multiple outer shell plate units, which are spliced ​​together to form the outer shell.

[0015] Furthermore, the thin-shell structure also includes sealing ends connected to both ends of the inner shell in the axial direction to seal the inner cavity.

[0016] Furthermore, the sealing end is an annular, integral structural component; and / or, the sealing end includes multiple sealing end units, which are spliced ​​together to form the sealing end.

[0017] Furthermore, the dimension of the inner cavity in the radial direction of the inner shell is greater than the wall thickness of the inner shell and / or the outer shell.

[0018] The technical solution adopted in this utility model can achieve the following beneficial effects:

[0019] The thin-shell structure of this application, when subjected to external loads, causes the shell to tend to collapse or buckle inwards. The high-pressure contents filling the inner cavity exert an outward pressure on the shell. This outward pressure directly offsets part of the inward compressive stress generated by the external load, reducing the compressive load that the shell itself needs to bear. On the other hand, the shell mainly serves to constrain the inner cavity. When the shell shows a slight tendency to deform inwards, it will cause the inner cavity volume to shrink. The shrinkage of the inner cavity volume will drastically increase the pressure of the contents of the inner cavity. The increased pressure will generate a greater outward thrust, strongly resisting this indentation deformation, thereby ensuring the structural stability of the entire thin-shell structure. Compared with the traditional thickening design, it can reduce the burden caused by thickening while ensuring the overall structural rigidity. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is one of the structural schematic diagrams of the thin-shell structure according to an embodiment of this application;

[0022] Figure 2 This is one of the cross-sectional schematic diagrams of the thin-shell structure according to an embodiment of this application;

[0023] Figure 3 This is a second schematic diagram of the thin-shell structure according to an embodiment of this application;

[0024] Figure 4 This is a second cross-sectional schematic diagram of the thin-shell structure according to an embodiment of this application;

[0025] Figure 5 This is a schematic diagram of the arrangement of the partition on the outer shell according to an embodiment of this application.

[0026] In the picture:

[0027] 100, Inner shell; 110, Injection port; 200, Outer shell; 300, Inner cavity; 310, Unit cavity; 400, Partition plate; 500, Sealing end. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0030] The following is in conjunction with the appendix Figures 1-5 The thin-shell structure provided in this application will be described in detail through specific embodiments and application scenarios.

[0031] Please see Figure 1 and Figure 2 This application discloses a thin-shell structure, which can be applied to tank structures involved in the transportation of pressure vessels, dangerous goods, hazardous chemicals, and petrochemical products, or to the pressure hulls of large and medium-sized military submarines. This application does not impose specific limitations in this regard. Specifically, the disclosed thin-shell structure includes an inner shell 100 and an outer shell 200. The outer shell 200 is disposed on the outer periphery of the inner shell 100 and forms an inner cavity 300 between it and the inner shell 100. Exemplarily, both the inner shell 100 and the outer shell 200 can be cylindrical structures. The outer shell 200 is coaxially disposed on the outer periphery of the inner shell 100, and the end of the inner shell 100 can be sealed to the end of the outer shell 200. Exemplarily, one of the ends of the inner shell 100 and the outer shell 200 can be bent toward the other. After bending, the inner cavity 300 is sealed by welding, which also secures the inner shell 100 and the outer shell 200. Alternatively, the thin-shell structure may include a sealing end 500 independent of the inner shell 100 and the outer shell 200. For example, the sealing end 500 may be an annular plate structure, welded to the inner shell 100 and the outer shell 200 to seal the inner cavity 300, while also securing the inner shell 100 and the outer shell 200. In this embodiment, the inner cavity 300 is used to fill high-pressure contents. For example, the inner shell 100 may be provided with a pressure injection port 110, through which high-pressure contents can be injected into the inner cavity 300 to maintain an internal pressure higher than the ambient pressure. For example, the high-pressure contents may be a compressible fluid, such as a compressed gas or a gas-liquid mixture.

[0032] Based on the above technical solution, when the inner cavity 300 is filled with high-pressure contents, the outer shell 200 is in a state of tensile prestress. When an external load is applied to the outer shell 200, it tends to collapse or buckle inward. The high-pressure contents in the inner cavity 300 exert an outward pressure on the outer shell 200. This outward pressure directly offsets part of the inward compressive stress generated by the external load, reducing the compressive load that the outer shell 200 itself needs to bear. On the other hand, the outer shell 200 mainly serves to constrain the inner cavity 300. When the outer shell 200 shows a slight inward deformation tendency, it will cause the volume of the inner cavity 300 to shrink. The shrinkage of the inner cavity volume will drastically increase the pressure of the contents of the inner cavity 300. The increased pressure will generate a greater outward thrust, strongly resisting this indentation deformation, thereby ensuring the structural stability of the entire thin shell structure. Compared with the traditional thickening design, it can reduce the burden brought by the thickening while ensuring the overall structural rigidity.

[0033] During the research process, the inventors discovered that the high-pressure contents in the inner cavity 300 exert relatively concentrated forces on the inner shell 100 and outer shell 200 in certain local areas, which easily leads to local stress concentration. This causes the thin-shell structure to deform, and when a certain part is damaged, such as when a crack appears in the inner shell or outer shell, the high-pressure contents may leak rapidly, causing the pressure in the entire inner cavity to drop sharply. The structure quickly loses its load-bearing capacity, resulting in a rapid decline in the safety of the application of the thin-shell structure.

[0034] In light of this situation, please refer to the embodiments of this application. Figure 3 , Figure 4 and Figure 5 The thin-shell structure may also include a partition 400, which is connected between the inner shell 100 and the outer shell 200. The partition 400 is used to divide the inner cavity 300 into multiple unit cavities 310. Each unit cavity 310 is relatively independent and each unit cavity 310 is filled with the aforementioned high-pressure contents. For example, the number of unit cavities 310 can be 2, 10, 16 or 32, etc. The number of unit cavities 310 can be adaptively adjusted according to the actual application scenario. This application does not impose specific limitations on this. On the one hand, the partition 400 tightly connects the inner shell 100 and the outer shell 200 together to form an organic whole. When subjected to external impacts or dynamic loads, the thin shell structure can better transfer and disperse these loads, avoid local structural failure due to excessive vibration or deformation, and improve the integrity and safety of the thin shell structure. On the other hand, based on the separating effect of the partition 400, the stress is more evenly distributed on the entire thin shell structure, and each unit cavity 310 independently bears and transfers part of the pressure, which greatly reduces the risk of excessive local stress and improves the overall strength of the thin shell structure.

[0035] After the partition divides the inner cavity 300 into multiple unit cavities 310, even if one unit cavity 310 ruptures, the high-pressure contents will only leak within that unit cavity 310, while the other unit cavities 310 will maintain a high pressure, continuing to provide strength support for the thin-shell structure. It is understandable that each unit cavity 310 can be individually connected to pressure sensors or other devices to monitor pressure changes of the high-pressure contents within the unit cavity in real time. By analyzing the pressure data, any abnormalities such as leaks or ruptures in the structure can be detected promptly.

[0036] Meanwhile, when the inner cavity 300 is filled with high-pressure contents, the outer shell 200 is in a state of tensile prestress. The partition 400 is connected between the inner shell 100 and the outer shell 200. The partition 400 can act as a tie rod, that is, the outer shell 200 can exert a certain tension on the inner shell 100 through the partition 400 to prevent the inner shell 100 from collapsing.

[0037] In some embodiments of this application, please refer to... Figure 5 The partition 400 can be flat, and multiple partitions 400 extend along the axial direction of the inner shell 100 and are distributed along the circumference of the inner shell 100. In this way, the inner cavity 300 is divided into multiple unit cavities 310 distributed along the circumference of the inner shell 100. The circumferentially distributed partitions 400 form a structure similar to a circumferential reinforcing rib, which can effectively resist the action of torque. When the structure is subjected to torsional load, the partitions 400 will prevent relative torsion between the inner shell 100 and the outer shell 200, and distribute the torque evenly on the entire thin shell structure, thereby improving the torsional stiffness and stability of the thin shell structure.

[0038] In some embodiments of this application, the partition 400 may also extend circumferentially along the inner shell 100, and multiple annular partitions 400 are distributed axially along the inner shell 100 (not shown in the figure). For example, the partition 400 may be an annular plate surrounding the inner shell 100. In this way, the inner cavity 300 is divided into multiple unit cavities 310 distributed along the axial direction of the inner shell 100. The annular partition 400 continuously surrounds the inner shell 100 in the circumferential direction, forming an overall circumferential constraint. When the thin shell structure is subjected to external load, the partition 400 can also prevent relative torsion between the inner shell 100 and the outer shell 200, and distribute the torque evenly on the entire thin shell structure, thereby improving the torsional stiffness and stability of the thin shell structure.

[0039] Of course, in some embodiments of this application, the partitions 400 can also be distributed in an interlaced manner between the inner shell 100 and the outer shell 200 to form a cage-like structure (not shown in the figure). The partitions in the cage-like structure are interlaced and connected in multiple directions to form a three-dimensional support network, which can effectively resist the deformation caused by external impact and improve the structural stability and safety of the entire thin shell structure.

[0040] In the embodiments of this application, please continue to refer to Figure 3 The inner shell 100 is provided with a pressure injection port 110 corresponding to the unit cavity 310. Each unit cavity 310 is equipped with an independent pressure injection port. Operators can inject high-pressure contents into the unit cavity 310 through the pressure injection port 110. Compared with the method of setting the pressure injection port 110 on the outer shell 200, it can avoid the pressure injection port 110 from being damaged by environmental influences.

[0041] In this embodiment, the inner shell 100 can be formed by bending and welding a one-piece sheet metal, or the inner shell 100 can include multiple inner shell plate units, which are spliced ​​together to form the inner shell 100. The inner shell plate unit can be a planar plate structure or an arc-shaped plate structure. This application does not impose specific limitations on this. For example, the inner shell plate unit is preferably an arc-shaped plate unit, so that the spliced ​​inner shell 100 has a cylindrical structure.

[0042] In this embodiment, the outer shell 200 can be formed by bending and welding a one-piece sheet metal, or the outer shell 200 can include multiple outer shell plate units, which are spliced ​​together to form the outer shell 200. The outer shell plate units can be either flat plate structures or curved plate structures, and this application does not impose specific limitations on them. For ease of subsequent description, this application will describe an arrangement in which the partition 400 extends axially along the inner shell 100 and the multiple partitions 400 are distributed circumferentially along the inner shell 100.

[0043] In a preferred embodiment, the outer shell 200 is formed by bending and welding a one-piece sheet metal, and the inner shell 100 is formed by splicing multiple inner shell plate units. In this way, when manufacturing the thin shell structure, the outer shell 200 structure can be formed first, and then multiple partitions 400 can be welded to the inner side of the outer shell 200 as the basic component. Finally, inner shell plate units are welded to the radially inner side of the partitions 400. Multiple inner shell plate units are spliced ​​together to form the inner shell 100 structure. In this way, the assembly method from the outside to the inside gives the initially formed outer shell 200 a certain barrier function, which can ensure the assembly accuracy of the partitions 400 and inner shell plate units inside.

[0044] In this embodiment, the thin-shell structure further includes a sealing end 500, which is connected to both ends of the inner shell 100 in the axial direction to seal the inner cavity 300. In an optional embodiment, the sealing end 500 can be an annular plate structure. After the inner shell 100, outer shell 200, and partition 400 are assembled, the sealing end 500 can be welded to the ends of the inner shell 100 and outer shell 200 to seal the inner cavity 300. In some optional embodiments of this application, the sealing end 500 can also be a split structure. Specifically, the sealing end 500 can include multiple sealing end units. Each sealing end unit can be welded and fixed to the inner shell 100, outer shell 200, and two circumferentially adjacent partitions 400 to seal the unit cavity 310. Multiple sealing end units are circumferentially spliced ​​together to form the sealing end 500.

[0045] In a further technical solution, the radial dimension of the inner cavity 300 of the inner shell 100 is greater than the wall thickness of the inner shell 100 and / or the outer shell 200. For example, the wall thickness of both the inner shell 100 and the outer shell 200 can be 2 mm, and the radial dimension of the inner cavity 300 of the inner shell 100 can be 100 mm. In this way, when the entire thin-shell structure is subjected to external loads, it is easier to trigger the thin-shell load-bearing effect of the outer shell 100, that is, the external load is mainly borne evenly by the tensile stress of the outer shell 200, thereby improving the compressive strength of the thin-shell structure. On the other hand, while ensuring the compressive strength of the entire thin-shell structure, the larger radial dimension of the inner cavity 300 means that the material used for the inner shell 100 and the outer shell 200 can be relatively reduced, so that the weight of the entire thin-shell structure can be significantly reduced. It should be noted that the wall thickness of the inner shell 100 and the wall thickness of the outer shell 200 can be the same or different, and this application does not impose specific limitations on this.

[0046] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0047] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A thin-shell structure, characterized in that, It includes an inner shell (100) and an outer shell (200), the outer shell (200) being disposed on the outer periphery of the inner shell (100) and forming an inner cavity (300) between the inner shell (100) and the inner shell (100), the inner cavity (300) being used to fill high-pressure contents.

2. The thin-shell structure according to claim 1, characterized in that, It also includes a partition (400) connected between the inner shell (100) and the outer shell (200), the partition (400) being used to divide the inner cavity (300) into a plurality of unit cavities (310).

3. The thin-shell structure according to claim 2, characterized in that, The plurality of partitions (400) are arranged to extend along the axial direction of the inner shell (100), and the plurality of partitions (400) are distributed along the circumferential direction of the inner shell (100); And / or, a plurality of said partitions (400) are provided to extend circumferentially along the inner shell (100), and the plurality of said partitions (400) are distributed circumferentially along the inner shell (100); And / or, multiple partitions (400) are staggered between the inner shell (100) and the outer shell (200) to form a cage-like structure.

4. The thin-shell structure according to claim 2, characterized in that, The inner shell (100) is provided with a pressure injection port (110) corresponding to the unit cavity (310).

5. The thin-shell structure according to any one of claims 1 to 4, characterized in that, The inner shell (100) is formed by bending and welding a one-piece sheet metal, or the inner shell (100) includes multiple inner shell plate units, which are spliced ​​together to form the inner shell (100). And / or, the housing (200) is formed by bending and welding a single piece of sheet metal, or the housing (200) comprises a plurality of housing plate units, which are spliced ​​together to form the housing (200).

6. The thin-shell structure according to any one of claims 1 to 4, characterized in that, It also includes a sealing end (500) which is connected to both ends of the inner shell (100) in the axial direction to seal the inner cavity (300).

7. The thin-shell structure according to claim 6, characterized in that, The sealing end (500) is an annular integral structural component; and / or, the sealing end (500) includes multiple sealing end units, which are spliced ​​together to form the sealing end (500).

8. The thin-shell structure according to any one of claims 1 to 4, characterized in that, The dimension of the inner cavity (300) in the radial direction of the inner shell (100) is greater than the wall thickness of the inner shell (100) and / or the outer shell (200).

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