Corrugated sheet for cryogenic liquid cargo tank
By setting different corrugation depths and adding compensating corrugations in the main area and corrugation compensation area of the corrugated plate, the problem of automatic welding of corrugated plates was solved, the smoothness of the welding path and the maintenance of the widening compensation capability were achieved, and the welding quality and the safety of the storage tank were improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SINOTECH ENERGY CO LTD
- Filing Date
- 2026-04-27
- Publication Date
- 2026-06-12
AI Technical Summary
In existing technologies, it is difficult to automate the welding of corrugated plates, and the complex welding path makes it impossible for welding equipment to track stably, affecting welding quality and efficiency. At the same time, the widening compensation capability of the corrugated plate decreases during the welding process, which weakens the overall safety of the storage tank.
Design a corrugated plate with different corrugation depths in the main area and the corrugation compensation area, and add compensating corrugations in the corrugation compensation area to maintain the continuity of the corrugated structure and the overall plate expansion capability, while realizing automatic welding.
It achieves automatic welding stability and a smooth welding path for corrugated plates, avoids stress concentration, maintains the corrugated plate's widening compensation capability, and ensures the long-term service reliability and welding quality of the shielding layer.
Smart Images
Figure CN122191437A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cryogenic storage tank technology, and in particular to a corrugated plate for cryogenic liquid cargo storage tanks. Background Technology
[0002] Corrugated sheets are a core component of the shielding layer in cryogenic liquid cargo storage and transportation systems such as liquefied natural gas (LNG), liquid hydrogen, and liquid oxygen. They are formed by pressing a metal plate into a corrugated structure that bulges along its thickness. The expansion and contraction of the corrugations absorb thermal deformation caused by cryogenic conditions, thus preventing the shielding layer from being damaged by thermal stress. In practical applications, multiple corrugated sheets need to be welded together at the edges to form a complete, large-area shielding layer.
[0003] To ensure sufficient thermal shrinkage compensation for a single corrugated sheet, a large corrugation depth is required. However, when two corrugated sheets are butt-welded at the edge, if the corrugation depth in the edge area is the same as that in the main body area, the welding path will exhibit significant three-dimensional undulations along the corrugations, making it impossible for conventional automatic welding equipment to stably track the weld. A seemingly straightforward solution is to uniformly reduce the corrugation depth of the entire corrugated sheet to a range acceptable for automatic welding. While this allows for automatic welding, it significantly reduces the corrugated sheet's widening compensation capability, weakening the overall safety of the storage tank. Summary of the Invention
[0004] Therefore, the purpose of this invention is to overcome the problem of the difficulty in achieving automatic welding of corrugated plates, and to provide a corrugated plate for cryogenic liquid storage tanks, wherein the same corrugated structure has different absolute values of corrugation depth in the main area and the corrugation compensation area, and to cooperate with the addition of compensating corrugations in the corrugation compensation area, so as to achieve automatic welding of the corrugation compensation area while maintaining the continuity of the corrugated structure and the overall plate widening capability.
[0005] To solve the above-mentioned technical problems, the present invention provides a corrugated plate for cryogenic liquid cargo storage tanks, the corrugated plate comprising a planar portion and a corrugated structure formed on the planar portion; the planar portion having a main region and an edge region surrounding the main region, the edge region being used to connect with the edge region of another corrugated plate; at least one side of the edge region constitutes a corrugation compensation region;
[0006] When the same corrugated structure extends from the main body region to the corrugation compensation region, the corrugated structure has a first corrugation depth L1 in the main body region and a second corrugation depth L2 in the corrugation compensation region; the absolute value of the first corrugation depth L1 is greater than the absolute value of the second corrugation depth L2.
[0007] Compensation corrugations are also formed on the planar portion of the corrugation compensation area, and the compensation corrugations are formed between at least one set of adjacent corrugation structures in the corrugation compensation area.
[0008] Preferably, the corrugated structure of the main body region extends along a first direction, and the corrugated structure of the corrugated compensation region extends along a first direction; the first direction is the direction from the outside of the storage tank to the inside of the storage tank.
[0009] Preferably, the corrugated structure of the main body region extends along a first direction, and the corrugated structure of the corrugated compensation region extends along a second direction, wherein the first direction is the direction from the outside of the storage tank to the inside of the storage tank, and the second direction is the direction from the inside of the storage tank to the outside of the storage tank.
[0010] Preferably, the corrugated structure of the main body region extends along a second direction, and the corrugated structure of the corrugated compensation region extends along a second direction; the second direction is the direction from the inside of the storage tank to the outside of the storage tank.
[0011] Preferably, the corrugated structure of the main body region extends along a second direction, and the corrugated structure of the corrugated compensation region extends along a first direction; the first direction is the direction from the outside of the storage tank to the inside of the storage tank, and the second direction is the direction from the inside of the storage tank to the outside of the storage tank.
[0012] Preferably, the second corrugation depth L2 and the first corrugation depth L1 satisfy the following relationship: the ratio of the absolute value of the second corrugation depth L2 to the absolute value of the first corrugation depth L1 is 0.3 to 0.7.
[0013] Preferably, the compensation corrugations and the corrugations of the corrugated structure in the corrugation compensation region have the same corrugation orientation.
[0014] Preferably, the corrugations of the compensation corrugations are opposite in orientation to the corrugations of the corrugation structure in the corrugation compensation region.
[0015] Preferably, the compensation ripple has a third ripple depth L3, and the absolute value of the third ripple depth L3 is not greater than the absolute value of the first ripple depth L1.
[0016] Preferably, the third corrugation depth L3 and the first corrugation depth L1 satisfy the following relationship: the ratio of the absolute value of the third corrugation depth L3 to the absolute value of the first corrugation depth L1 is 0.3~1.
[0017] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:
[0018] First, the same corrugated structure extends continuously and the absolute value of the corrugation depth in the compensation corrugated area is smaller than that in the main area, so that the surface undulation of the corrugated compensation area is significantly lower than that in the main area, and the welding path tends to be gentle, which allows for efficient and stable welding using conventional automatic welding equipment.
[0019] Secondly, since the same corrugated structure continues to extend after the depth decreases, rather than being cut off or replaced with different corrugated shapes at the edges, the load transfer path of the corrugated structure remains continuous, avoiding stress concentration caused by structural abrupt changes.
[0020] Third, the addition of compensating corrugations makes up for the widening loss caused by the reduction in corrugation depth, so that the corrugation compensation area maintains a total corrugation unfolding length comparable to the main area under the condition that the projected width remains unchanged, and the widening compensation capability of the entire corrugated plate is uniform.
[0021] Fourth, it completely avoids the problem of reduced overall plate width caused by forcing a reduction in corrugation depth to accommodate welding. The main area can maintain a larger corrugation depth to ensure compensation performance, while the corrugation compensation area uses a smaller corrugation depth to ensure welding processability, thus achieving unified optimization of structural performance and manufacturing process.
[0022] Fifth, the compensation corrugations are formed between adjacent corrugated structures without interrupting the continuity of the original corrugated structure. Therefore, no new structural weak points will be introduced in the corrugation compensation area, ensuring the long-term service reliability of the shielding layer.
[0023] In summary, the corrugated plate for cryogenic liquid cargo storage tanks described in this invention has different absolute values of corrugation depth in the main body area and the corrugation compensation area of the same corrugated structure, and with the addition of compensating corrugations in the corrugation compensation area, it is possible to achieve automatic welding of the corrugation compensation area while maintaining the continuity of the corrugated structure and the overall plate widening capability. Attached Figure Description
[0024] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.
[0025] Figure 1 This is a schematic diagram of the corrugated plate used in a cryogenic liquid cargo storage tank in a preferred embodiment of the present invention;
[0026] Figure 2 A schematic diagram of a corrugated plate when the corrugated structures of the main area and the corrugated compensation area face the same direction, and the compensation corrugations face the opposite direction to the corrugated structures of the corrugated compensation area.
[0027] Figure 3 for Figure 2 The front view of the corrugated plate shown;
[0028] Figure 4 for Figure 3 A partially enlarged schematic diagram of the front view of the corrugated plate shown;
[0029] Figure 5 A structural schematic diagram illustrating the depth of the ripples;
[0030] Figure 6 A schematic diagram of the structure of a corrugated plate when the main area, the corrugated compensation area, and the compensation corrugations all have the same corrugated orientation;
[0031] Figure 7 This is a schematic diagram of the corrugated structure for the transition.
[0032] Explanation of reference numerals on the accompanying drawings:
[0033] 2. Planar section; 21. Main area; 22. Edge area; 23. Ripple compensation area; 24. Compensation ripples;
[0034] 4. Corrugated structure; 6. Corrugated transition structure;
[0035] X1, first direction; X2, second direction. Detailed Implementation
[0036] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.
[0037] This invention provides a corrugated plate for cryogenic liquid cargo storage tanks, which is particularly suitable for shielding layers in storage tanks for ultra-low temperature liquids such as liquefied natural gas (LNG), liquid hydrogen, and liquid oxygen. Taking an LNG membrane-type liquid cargo tank as an example, the corrugated plate is typically made of metal plates with good low-temperature toughness, such as Invar steel or stainless steel, through mold pressing. Multiple corrugated plates are welded at the edges to form a continuous and complete shielding layer. The specific structure, parameters, and implementation methods of this invention will be described in detail below.
[0038] Reference Figure 1 As shown, the corrugated plate of this embodiment includes a planar portion 2 and a corrugated structure 4 formed on the planar portion 2. The planar portion 2 is the base portion of the corrugated plate before the corrugations are pressed, and the corrugated structure 4 is a strip-shaped undulation that is pressed into the planar portion 2 along the thickness direction by a mold.
[0039] Reference Figure 1 and Figure 2As shown, the planar portion 2 is divided into a main region 21 and an edge region 22 surrounding the main region 21. The edge region 22 is used to connect with the edge region 22 of another corrugated plate; at least one edge region 22 is constructed as a corrugation compensation region 23 for butt welding with an adjacent corrugated plate. In actual large liquid cargo tanks, each corrugated plate is typically rectangular, and all four edges can be set as edge regions 22, with one or more edge regions 22 selected as corrugation compensation regions 23 as needed. (Refer to...) Figure 1 As shown, the three-sided edge region 22 serves as the ripple compensation region 23; refer to Figure 2 As shown, the four edge regions 22 serve as the ripple compensation regions 23.
[0040] Reference Figure 2 , Figure 3 and Figure 4 As shown, when the same corrugated structure 4 extends from the main body region 21 to the corrugated compensation region 23, the corrugated structure 4 has a first corrugation depth L1 in the main body region 21 and a second corrugation depth L2 in the corrugated compensation region 23, and the absolute value of the first corrugation depth L1 is greater than the absolute value of the second corrugation depth L2.
[0041] Specifically, each corrugated structure 4 is not truncated at the edge of the main region 21, but extends continuously into the corrugated compensation region 23, with different absolute depth values in different regions. For example, if the first corrugation depth L1 in the main region 21 is 40mm and convex upwards, and the second corrugation depth L2 of the same corrugated structure 4 in the corrugated compensation region 23 is 16mm and also convex upwards, then the absolute value of L1 is 40mm, and the absolute value of L2 is 16mm; 40mm is greater than 16mm. If the corrugations face opposite directions, for example, convex upwards by 40mm in the main region 21 and convex downwards by 16mm in the corrugated compensation region 23, then the absolute value still satisfies the condition that 40mm is greater than 16mm. This continuous extension of the same corrugated structure 4 with decreasing absolute depth ensures the geometric continuity of the corrugated structure 4 and avoids stress concentration caused by abrupt changes in depth at region boundaries. Meanwhile, the reduction in the absolute value of the depth makes the surface undulation amplitude of the corrugation compensation area 23 significantly lower than that of the main area 21. The fluctuation range of the welding path is controlled within the adaptive capability of the automatic welding equipment. The vertical adjustment required by the welding torch of conventional automatic welding equipment is greatly reduced, and the welding stability is significantly improved.
[0042] It should be noted that: reference Figure 5 As shown, the corrugation depth refers to the vertical distance H between the top of the crest or the bottom of the trough of the corrugated structure 4 and the reference plane of the planar part along the thickness direction of the corrugated plate.
[0043] Since the orientation of the corrugated structures 4 in the main body region 21 and the corrugated compensation region 23 can be the same or opposite, for ease of understanding, a first direction X1 and a second direction X2 are defined respectively. The first direction X1 is defined as the direction from the outside of the tank to the inside of the tank, and the second direction X2 is defined as the direction from the inside of the tank to the outside of the tank. Simultaneously, with the reference plane of the planar portion as the zero point, the corrugation depth towards the first direction X1 is defined as positive, and the corrugation depth towards the second direction X2 is defined as negative. Taking a specific orientation as an example, when the corrugated structure 4 in the main body region 21 is oriented towards the first direction X1, its first corrugation depth is +L1; conversely, when the corrugated structure 4 in the main body region 21 is oriented towards the second direction X2, its first corrugation depth is -L1. Regardless of whether the corrugated structure 4 in the main body region 21 is oriented towards the first direction X1 or the second direction X2, the absolute value of its first corrugation depth is L1. Similarly, when the corrugated structure 4 in the corrugated compensation region 23 faces the first direction X1, its second corrugation depth is +L2; conversely, when the corrugated structure 4 in the corrugated compensation region 23 faces the second direction X2, its second corrugation depth is -L2.
[0044] Furthermore, in the corrugated plate of this embodiment, a compensation corrugation 24 is also formed on the planar portion of the corrugation compensation region 23, and the compensation corrugation 24 is formed between at least one set of adjacent corrugated structures 4 in the corrugation compensation region 23. The compensation corrugation 24 is also a strip-shaped undulation that protrudes along the thickness direction, and its extension direction is parallel to the original corrugated structure 4.
[0045] Compensating corrugations 24 are introduced to address the decrease in widening capacity caused by the reduction in the absolute value of corrugation depth. From a geometric perspective, when the absolute value of corrugation depth decreases, the actual unfolded length of the corrugation profile shortens accordingly within the same projected width. By adding compensating corrugations 24 between adjacent corrugated structures 4, the total number of corrugations per unit projected width within the corrugation compensation area 23 increases, and the total unfolded length can be restored to approximately the same as that of the main area 21. It should be noted that the number of compensating corrugations 24 is not specifically limited; those skilled in the art can optimize their selection based on the sheet thickness, corrugation pitch, and widening requirements to ensure that the total unfolded length of the corrugation compensation area 23 is comparable to that of the main area 21.
[0046] Reference Figure 5As shown, the corrugation orientation of the compensating corrugation 24 can be the same as or opposite to the corrugation orientation of the corrugated structure 4 (hereinafter referred to as the main corrugation) within the corrugated compensation region 23. When the compensating corrugation 24 is oriented towards the first direction X1, its third corrugation depth is +L3; conversely, when it is oriented towards the second direction X2, its third corrugation depth is -L3. In particular, when the compensating corrugation 24 is oriented opposite to the main corrugation, under low-temperature conditions, the main corrugation oriented towards the first direction X1 tends to flatten under tension, and the compensating corrugation 24 oriented towards the second direction X2 also tends to flatten under tension. However, their deformation directions are opposite, mutually restricting each other, effectively improving the stiffness of the corrugated compensation region 23 in the thickness direction and enhancing its resistance to local buckling. When the main corrugation is oriented towards the second direction and the compensating corrugation 24 is oriented towards the first direction, the stiffness of the corrugated compensation region 23 in the thickness direction is also improved, enhancing its resistance to local buckling.
[0047] In the above scheme, the same corrugated structure 4 has different absolute values of corrugation depth in the main area 21 and the corrugation compensation area 23, and a compensation corrugation 24 is added in the corrugation compensation area 23, which can realize automatic welding of the corrugation compensation area while maintaining the continuity of the corrugated structure and the ability of the whole plate to expand.
[0048] Furthermore, the ratio of the absolute value of the second corrugation depth L2 to the absolute value of the first corrugation depth L1 is in the range of 0.3 to 0.7; the ratio of the absolute value of the third corrugation depth L3 to the absolute value of the first corrugation depth L1 is in the range of 0.3 to 1. In a preferred embodiment, the absolute values of the second corrugation depth L2 and the third corrugation depth L3 are the same, which facilitates mold design and process control.
[0049] Specifically, in one embodiment, the absolute value of the second corrugation depth L2 is 0.3 times the absolute value of the first corrugation depth L1, and the absolute value of the second corrugation depth L2 is the same as the absolute value of the third corrugation depth L3. Taking an absolute value of L1 of 50mm, an absolute value of L2 of 15mm, and an absolute value of L3 of 15mm as an example, the first corrugation depth L1 of the corrugated structure 4 in the main area 21 is +50mm, the second corrugation depth L2 of the same corrugated structure 4 in the corrugated compensation area 23 is +15mm, and the third corrugation depth of the compensation corrugation is +15mm. This is suitable for large storage tank construction scenarios where welding efficiency requirements are high and the width of the corrugated compensation area 23 is small (e.g., 100mm to 150mm). Its core advantage lies in achieving near-flat plate welding process conditions, while restoring the widening capacity through dense compensation corrugations 24.
[0050] In another specific implementation, the absolute value of the second corrugation depth L2 is 0.5 times the absolute value of the first corrugation depth L1, and the absolute value of the second corrugation depth L2 is the same as the absolute value of the third corrugation depth L3. Taking an absolute value of L1 of 40mm, an absolute value of L2 of 20mm, and an absolute value of L3 of 20mm as an example, the first corrugation depth L1 of the corrugated structure 4 in the main body region 21 is +40mm, the second corrugation depth L2 of the same corrugated structure 4 in the corrugated compensation region 23 is +20mm, and the third corrugation depth of the compensation corrugation is +20mm. This is suitable for most standard LNG carriers, achieving a good balance between welding efficiency, width matching, and structural stability, and is the most recommended ratio selection in engineering.
[0051] In other specific implementations, the absolute value of the second corrugation depth L2 is 0.7 times the absolute value of the first corrugation depth L1, and the absolute value of the second corrugation depth L2 is the same as the absolute value of the third corrugation depth L3. Taking an absolute value of L1 of 30mm, an absolute value of L2 of 21mm, and an absolute value of L3 of 21mm as an example, the first corrugation depth L1 of the corrugated structure 4 in the main area 21 is +30mm, the second corrugation depth L2 of the same corrugated structure 4 in the corrugated compensation area 23 is +21mm, and the third corrugation depth of the compensation corrugation is +21mm. This is suitable for large land-based storage tanks with high structural safety requirements but relatively relaxed welding speed requirements, as well as for stainless steel corrugated plates with thicker plates and greater forming difficulty.
[0052] In other specific embodiments, the absolute value of the second corrugation depth L2 is 0.7 times the absolute value of the first corrugation depth L1, and the absolute value of the second corrugation depth L2 is the same as the absolute value of the first corrugation depth L1. Taking an absolute value of L1 of 40mm, an absolute value of L2 of 20mm, and an absolute value of L3 of 40mm as an example, the first corrugation depth L1 of the corrugated structure 4 in the main body region 21 is +40mm, the second corrugation depth L2 of the same corrugated structure 4 in the corrugated compensation region 23 is +28mm, and the third corrugation depth L3 of the compensation corrugation 24 is set to -40mm. This corrugated plate is used in critical parts of large LNG carriers that need to withstand extreme thermal cycling loads, such as the area near the cross joint of the tank wall or the cargo tank that frequently undergoes rapid loading and unloading conditions.
[0053] Example 1: In this example, the corrugations of the corrugated structures 4 in the main body region 21 and the corrugation compensation region 23 are oriented in the same direction. The corrugation orientation of the compensation corrugation 24 can be set to be the same as that of the corrugated structure 4 in the corrugation compensation region 23, or it can be set to be opposite, or it can be set to be partially the same and partially opposite.
[0054] Specifically, the corrugated sheet is formed on the same side. Taking the planar portion 2 as a reference, the corrugated structure 4 of the main body region 21 protrudes in the first direction; the corrugated structure 4 of the corrugated compensation region 23 also protrudes in the first direction. Since the corrugations of both are oriented in the same direction, in the transition area from the main body region 21 to the corrugated compensation region 23, the corrugated structure 4 only undergoes a change in depth, without a change in orientation. This gradual transition can be achieved by setting a transition section with a gradually changing depth on the mold. Within the transition section, the corrugation depth continuously decreases from L1 to L2, and the corrugation contour remains smooth and continuous without any geometric abrupt changes. Therefore, stress concentration will not occur, and there is no need to set up a special transition corrugated structure.
[0055] Within the corrugation compensation region 23, compensation corrugations 24 are provided between adjacent corrugated structures 4. The compensation corrugations 24 are also formed on the planar portion 2, and their extension direction is parallel to the corrugated structures 4. Regarding the corrugation orientation of the compensation corrugations 24, this embodiment provides two optional schemes.
[0056] Option 1: Refer to Figure 6 As shown, the corrugation orientation of the compensation corrugation 24 is the same as that of the corrugation structure 4 of the corrugation compensation region 23, both bulging in the first direction. This unidirectional corrugation layout ensures that all corrugations in the corrugation compensation region 23 extend in the same direction.
[0057] Option 2: Refer to Figure 2 As shown, the corrugation orientation of the compensating corrugation 24 is opposite to that of the corrugated structure 4 of the corrugated compensation region 23. For example, the corrugated structure 4 of the corrugated compensation region 23 protrudes in a second direction, while the compensating corrugation 24 protrudes in a first direction. Under this scheme, if the corrugation depth of the corrugated structure 4 of the corrugated compensation region 23 is -16mm, and the corrugation depth of the compensating corrugation 24 is assumed to be +16mm, then the vertical distance between the trough of the compensating corrugation 24 and the crest of the corrugated structure 4 of the corrugated compensation region 23 reaches 32mm, that is, the relative height difference between the two corrugations increases. This opposite orientation design has unique advantages in some cases: when the corrugated plate is stretched in a low-temperature environment, the different corrugations with opposite orientations will restrain each other, producing a mechanical effect similar to interlocking, which can improve the buckling stability of the corrugated compensation region 23 in the thickness direction.
[0058] In other specific embodiments, if the corrugated structure 4 of the corrugated compensation area 23 protrudes in the first direction, while the compensation corrugation 24 protrudes in the second direction, since the compensation corrugation 24 protrudes in the second direction, its trough is lower than the reference plane of the planar portion 2. This makes the upper surface of the corrugated compensation area 23 mainly composed of the crests of the corrugated structure 4 and the planar portion between them. The welding trajectory can be carried out along the valley bottom plane between the corrugated structures 4, further reducing the undulation amplitude of the welding path.
[0059] Example 2: In this example, the corrugations of the main body region 21 and the corrugation compensation region 23 are opposite. The corrugation structure 4 of the main body region 21 is connected to the corrugation compensation region 23 via the transition corrugation structure 6. The corrugation orientation of the compensation corrugation 24 can be set to be the same as or opposite to the corrugation structure 4 of the corrugation compensation region 23.
[0060] Specifically, the corrugated plate in this embodiment adopts a non-side forming method. Taking the planar portion 2 as a reference, the corrugated structure 4 of the main body region 21 protrudes in a first direction, and the corrugated structure 4 of the corrugated compensation region 23 protrudes in a second direction; since the corrugations of the main body region 21 and the corrugated compensation region 23 are oriented in opposite directions, a reference needs to be set in the transition area between them. Figure 7 The transition corrugated structure 6 is shown.
[0061] The transition corrugated structure 6 is located between the main body region 21 and the corrugation compensation region 23, and its function is to achieve a smooth reversal of the corrugation orientation. The initial end of the transition corrugated structure 6 is connected to the corrugated structure 4 of the main body region 21, at which point the corrugation orientation is convex in the first direction. As it extends towards the corrugation compensation region 23, the corrugation depth of the transition corrugated structure 6 gradually decreases, reaching zero at a certain intermediate position, meaning the corrugation returns to the reference plane of the planar portion 2. Thereafter, the corrugation continues to gradually increase in the opposite direction, eventually reaching the corrugation depth of the corrugation compensation region 23 at its end, where the corrugation orientation is convex in the second direction.
[0062] Within the corrugation compensation region 23, compensation corrugations 24 are provided between adjacent corrugated structures 4. The compensation corrugations 24 are formed on the planar portion 2, and their extension direction is parallel to the corrugated structure 4. Regarding the corrugation orientation of the compensation corrugations 24, this embodiment also provides two optional options.
[0063] Option 3: The corrugation orientation of the compensation corrugation 24 is the same as that of the corrugation structure 4 of the corrugation compensation area 23. In this option, all corrugations (including the main corrugations and the compensation corrugations 24) in the corrugation compensation area 23 face the same direction, for example, they all bulge towards the first direction. This all-uniform layout makes the back (i.e., the bottom) of the corrugation compensation area 23 form a regular corrugation outline, while the front (i.e., the top) is relatively flat. Since automatic welding is usually performed on the front of the corrugated plate, the relatively flat surface of the front is very beneficial for the movement of automatic welding equipment and weld seam tracking. At the same time, the compensation corrugation 24 faces the same direction as the main corrugation, the transition between the two is smooth, and the mold design is also relatively simple.
[0064] Option 4: The corrugation orientation of the compensating corrugation 24 is opposite to that of the corrugation structure 4 of the corrugated compensation area 23. For example, the main corrugation bulges in the second direction, while the compensating corrugation 24 bulges in the first direction. In this option, the main corrugation and the compensating corrugation 24 have opposite orientations, forming an alternating up-and-down undulating structure. This alternating layout produces a more complex deformation mode within the corrugated compensation area 23: when the corrugated plate is subjected to low-temperature tension, the compensating corrugation 24 bulging in the first direction and the main corrugation bulging in the second direction will restrain each other, thereby improving the effective stiffness of the corrugated compensation area 23 in the thickness direction and enhancing its resistance to local buckling. At the same time, this alternating undulating structure forms a relatively uniform corrugation distribution on both sides of the corrugated compensation area 23, which is beneficial for scenarios involving double-sided welding or double-sided construction.
[0065] In this embodiment, since the corrugation orientation of the main body region 21 is opposite to that of the corrugation compensation region 23, the transition of corrugation depth and orientation reversal are simultaneously achieved through the transition corrugation structure 6. It should be noted that the compensation corrugation 24 is only provided within the corrugation compensation region 23 and does not extend to the transition corrugation structure 6 or the main body region 21.
[0066] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.
Claims
1. A corrugated plate for cryogenic liquid cargo storage tanks, characterized in that... The corrugated plate includes a planar portion and a corrugated structure formed on the planar portion; the planar portion has a main region and an edge region surrounding the main region, the edge region being used to connect with the edge region of another corrugated plate; The edge region on at least one side constitutes a ripple compensation region; When the same corrugated structure extends from the main body region to the corrugation compensation region, the corrugated structure has a first corrugation depth L1 in the main body region and a second corrugation depth L2 in the corrugation compensation region; the absolute value of the first corrugation depth L1 is greater than the absolute value of the second corrugation depth L2. Compensation corrugations are also formed on the planar portion of the corrugation compensation area, and the compensation corrugations are formed between at least one set of adjacent corrugation structures in the corrugation compensation area.
2. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 1, characterized in that... The corrugated structure of the main body region extends along a first direction, and the corrugated structure of the corrugated compensation region extends along a first direction; the first direction is the direction from the outside of the storage tank to the inside of the storage tank.
3. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 1, characterized in that... The corrugated structure of the main body region extends along a first direction, and the corrugated structure of the corrugated compensation region extends along a second direction. The first direction is the direction from the outside of the storage tank to the inside of the storage tank, and the second direction is the direction from the inside of the storage tank to the outside of the storage tank.
4. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 1, characterized in that... The corrugated structure of the main body region extends along the second direction, and the corrugated structure of the corrugated compensation region extends along the second direction; the second direction is the direction from the inside of the storage tank to the outside of the storage tank.
5. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 1, characterized in that... The corrugated structure of the main body region extends along the second direction, and the corrugated structure of the corrugated compensation region extends along the first direction; the first direction is the direction from the outside of the storage tank to the inside of the storage tank, and the second direction is the direction from the inside of the storage tank to the outside of the storage tank.
6. The corrugated plate for cryogenic liquid cargo storage tanks according to any one of claims 1-5, characterized in that... The second corrugation depth L2 and the first corrugation depth L1 satisfy the following relationship: the ratio of the absolute value of the second corrugation depth L2 to the absolute value of the first corrugation depth L1 is 0.3~0.
7.
7. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 1, characterized in that... The compensation ripples and the ripple structure of the ripple compensation region have the same ripple orientation.
8. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 1, characterized in that... The corrugations of the compensation corrugations are opposite in orientation to the corrugations of the corrugation structure in the corrugation compensation region.
9. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 7 or 8, characterized in that... The compensation ripple has a third ripple depth L3, and the absolute value of the third ripple depth L3 is not greater than the absolute value of the first ripple depth L1.
10. The corrugated plate for cryogenic liquid cargo storage tanks according to claim 9, characterized in that... The third corrugation depth L3 and the first corrugation depth L1 satisfy the following relationship: the ratio of the absolute value of the third corrugation depth L3 to the absolute value of the first corrugation depth L1 is 0.3~1.