Elbow plate, liquefied natural gas storage tank and assembled ship

Abstract

The invention relates to the technical field of liquefied gas storage equipment, in particular to an elbow plate, a liquefied natural gas storage tank and an assembled ship, the elbow plate comprises a first connecting plate, a second connecting plate and a turning plate, the first connecting plate extends in the first direction, and the first connecting plate is provided with a first positioning part used for being connected with a first corrugated plate; the second connecting plate extends in the second direction and is provided with a second positioning part used for being connected with the second corrugated plate. One end of the turning plate is connected with one end of the first connecting plate far away from the first positioning part, and the other end is connected with one end of the second connecting plate far away from the second positioning part; the first positioning part and / or the second positioning part are / is provided with landing ribs; the elbow plate can be conveniently positioned and assembled with other corrugated plates, the assembling efficiency is improved, and the sealing effect of a storage tank at the elbow plate in the later period is improved.

Description

Technical Field

[0001] The invention relates to the technical field of liquefied gas storage equipment, and in particular to an elbow plate, a liquefied natural gas storage tank and an assembly ship. Background Art

[0002] Liquefied natural gas (LNG) has the advantage of being easier to store and transport than its gaseous form. Among the many equipment in an LNG receiving station, the storage tanks for storing LNG have the longest construction period, the highest investment, and the most difficulties.

[0003] At present, my country's LNG storage mainly adopts tank storage, and the types of tanks are divided into traditional full-containment tanks and emerging membrane tanks. Full-containment tanks are made of 9% nickel steel plates welded together, while membrane tanks are welded with corrugated stainless steel plates; compared with full-containment tanks, membrane tanks use corrugated plate units welded together to avoid weld stress. At the same time, the corrugations on the corrugated plates can better absorb and release energy when the tank is injected and output natural gas. It is more economical and has a larger effective volume, making it a more advanced tank.

[0004] The elbow plate is an important part of the LNG membrane storage tank. It is in direct contact with the LNG and connected to other corrugated plates to play a sealing role. The current elbow plate has a poor positioning effect when assembled with other corrugated plates, which affects the assembly efficiency and the sealing effect of the storage tank at the elbow plate after assembly. Summary of the invention

[0005] The present invention provides an elbow plate, a liquefied natural gas storage tank and an assembled ship. The elbow plate is convenient for positioning and assembling with other corrugated plates, thereby improving assembly efficiency and the sealing effect of the storage tank at the elbow plate in the later stage.

[0006] In the first aspect, an embodiment of the present invention provides an elbow plate, comprising: a first connecting plate, extending along the first direction, the first connecting plate having a first positioning portion for connecting to the first corrugated plate; a second connecting plate, extending along the second direction, the second connecting plate having a second positioning portion for connecting to the second corrugated plate; a turning plate, one end of the turning plate is connected to an end of the first connecting plate away from the first positioning portion, and the other end is connected to an end of the second connecting plate away from the second positioning portion; wherein the first positioning portion and / or the second positioning portion are provided with overlapping ribs; the first direction is arranged to intersect with the second direction.

[0007] In a possible implementation, the first connecting plate includes a first arched portion extending along a first direction and a first plane portion arranged on both sides of the first arched portion; the second connecting plate includes a second arched portion extending along a second direction and a second plane portion arranged on both sides of the second arched portion; the turning plate includes an elbow arched portion and a third plane portion arranged on both sides of the elbow arched portion, the two ends of the elbow arched portion along the extension direction are respectively connected to the first arched portion and the second arched portion, and the two ends of the third plane along the extension direction are respectively connected to the first plane portion and the second plane portion.

[0008] In a possible implementation manner, the first positioning portion is provided with overlapping ribs, and the overlapping ribs are continuously provided on the first arched portion and the two first planar portions.

[0009] In a possible implementation, the overlap ribs separate the first connecting plate into a first part and a second part, and a height difference is formed between the first part and the second part, and the height difference is equal to the thickness of the first connecting plate.

[0010] In a possible implementation manner, the second portion is arranged away from the turning plate, and the second portion is arranged with equal width along a direction perpendicular to the first direction.

[0011] In a possible implementation, the first arched portion includes a first arch and first rounded corners arranged on both sides of the first arch, and the first arch and the first plane portion are smoothly transitioned through the first rounded corners; the second arched portion includes a second arch and second rounded corners arranged on both sides of the second arch, and the second arch and the second plane portion are smoothly transitioned through the second rounded corners; the elbow arched portion includes a third arch and third rounded corners arranged on both sides of the third arch, and the third arch and the third plane portion are smoothly transitioned through the third rounded corners.

[0012] In a possible implementation manner, two ends of the third circular arch along the extension direction are respectively connected to the first circular arch and the second circular arch, and two ends of the third rounded corner along the extension direction are respectively connected to the first rounded corner and the second rounded corner.

[0013] In a possible implementation, the first connecting plate is disposed in a mirror image with respect to a center line of the first arched portion, and the second connecting plate is disposed in a mirror image with respect to a center line of the second arched portion.

[0014] In a possible implementation, the elbow plate is integrally formed.

[0015] In a second aspect, an embodiment of the present invention provides a liquefied natural gas storage tank, comprising: a first corrugated plate and a second corrugated plate; and the above-mentioned elbow plate, wherein the elbow plate is used to connect the first corrugated plate and the second corrugated plate.

[0016] In a third aspect, an embodiment of the present invention provides an assembled ship, comprising the above-mentioned liquefied natural gas storage tank.

[0017] The elbow plate, liquefied natural gas storage tank and assembly ship provided by the present invention realize turning by means of a turning plate, a first connecting plate extends along a first direction and is connected to a first corrugated plate by means of a first positioning portion, a second connecting plate extends along a second direction and is connected to a second corrugated plate by means of a second positioning portion, and the first connecting plate and the second connecting plate extend in a straight line, so that they are conveniently connected to the first corrugated plate and the second corrugated plate, and the overlapping ribs play a positioning function, thereby improving assembly efficiency and the sealing effect of the storage tank at the elbow plate in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of an elbow plate provided by the present invention.

[0020] Figure 2 It is a structural schematic diagram of an elbow plate provided by the present invention from the side perspective of the first connecting plate.

[0021] Figure 3 It is a schematic structural diagram of an elbow plate provided by the present invention when viewed from a top view.

[0022] Figure 4 It is a structural schematic diagram of an elbow plate provided by the present invention from another perspective; Figure 5 yes Figure 4 Schematic diagram of the cross-section structure along the AA direction; Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure along the DD direction. Reference numerals: X, first direction; Y, second direction; 1. first connecting plate; 11. first positioning portion; 12. overlapping ribs; 13. first arched portion; 131. first rounded arch; 132. first fillet; 14. first plane portion; 15. first portion; 16. second portion; 2. second connecting plate; 21. second positioning portion; 22. second arched portion; 221. second rounded portion; 222. second rounded corner; 23. second plane portion; 3. Turning plate; 31. Elbow arch portion; 311. Third circular arch; 312. Third fillet; 32. Third plane portion. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Combine the following Figure 1-Figure 6 An elbow plate provided in an embodiment of the present invention is described, comprising: a first connecting plate 1, a second connecting plate 2 and a turning plate 3, wherein: The first connecting plate 1 is extended along the first direction X, and has a first positioning portion 11 for connecting to the first corrugated plate.

[0025] The second connecting plate 2 is extended along the second direction Y, and has a second positioning portion 21 for connecting to the second corrugated plate.

[0026] One end of the turning plate 3 is connected to one end of the first connecting plate 1 away from the first positioning portion 11 , and the other end is connected to one end of the second connecting plate 2 away from the second positioning portion 21 .

[0027] The first positioning portion 11 and / or the second positioning portion 21 are provided with overlapping ribs 12 ; and the first direction X and the second direction Y are arranged to intersect.

[0028] In the present invention, turning is achieved through the turning plate 3, the first connecting plate 1 extends along the first direction X and is connected to the first corrugated plate through the first positioning portion 11, the second connecting plate 2 extends along the second direction Y and is connected to the second corrugated plate through the second positioning portion 21, and the first connecting plate 1 and the second connecting plate 2 extend in a straight line, which is convenient for connecting with the first corrugated plate and the second corrugated plate, and the overlapping ribs 12 can play a positioning function during assembly, thereby improving assembly efficiency and the sealing effect of the storage tank at the elbow plate in the later stage.

[0029] In the related art, the current elbow plate adopts the form of a continuous corner, and when the two ends are connected to the first corrugated plate and the second corrugated plate respectively, mismatching is likely to occur, which affects the accuracy and efficiency of the assembly of the elbow plate and the corrugated plate.

[0030] In the embodiment provided by the present invention, the elbow plate is divided into a first connecting plate 1, a turning plate 3 and a second connecting plate 2, and the first connecting plate 1 and the second connecting plate 2 extend along straight lines respectively, which can effectively reduce the influence of uncertain factors at the corners, and can be more conveniently connected with the first corrugated plates and the second corrugated plates on both sides, and the overlapping ribs 12 arranged at the first positioning portion 11 and the second positioning portion 21 can further play a positioning effect, so as to be assembled with the first corrugated plate or the second corrugated plate, thereby improving the assembly efficiency, and at the same time can ensure the assembly accuracy of the elbow plate and the first corrugated plates and the second corrugated plates on both sides, and ensure the sealing effect of the subsequent storage tank at the elbow plate.

[0031] Specifically, the elbow plate is used at the corner of the liquefied natural gas storage tank, that is, to connect the tank bottom corrugated plate and the 90° corner corrugated plate of the storage tank. The first connecting plate 1 of an elbow plate connects the tank bottom corrugated plate, and the second connecting plate 2 connects the 90° corner corrugated plate. At the corner of a storage tank, two elbow plates are generally set to ensure the structural strength and sealing effect of the storage tank corner.

[0032] In practical applications, the setting of the lap ribs 12 forms a physical positioning reference. Through the cooperation between the lap ribs 12 and the corrugated plates, when assembling the LNG storage tank, the lap ribs 12 can ensure the accuracy of the installation position of the corrugated plates, thereby improving the positioning accuracy.

[0033] The intersection of the first direction X and the second direction Y is set to meet the corner requirements, and the smooth transition of the two directions is achieved through the turning plate 3, and the first corrugated plate and the second corrugated plate at the corner of the storage tank are connected to optimize the connection structure. In addition, the step structure formed by the lap rib 12 provides a reliable sealing surface. Through the close fit between the lap rib 12 and the corrugated plate, LNG storage in a low temperature environment of -162°C can be achieved, and the sealing performance is improved.

[0034] like Figure 1 , 5 As shown in Figure 6, in some embodiments, the first connecting plate 1 includes a first arch portion 13 extending along the first direction X and a first plane portion 14 arranged on both sides of the first arch portion 13; the second connecting plate 2 includes a second arch portion 22 extending along the second direction Y and a second plane portion 23 arranged on both sides of the second arch portion 22; the turning plate 3 includes an elbow arch portion 31 and a third plane portion 32 arranged on both sides of the elbow arch portion 31, and the two ends of the elbow arch portion 31 along the extension direction are respectively connected to the first arch portion 13 and the second arch portion 22, and the two ends of the third plane along the extension direction are respectively connected to the first plane portion 14 and the second plane portion 23.

[0035] In the present invention, the first connecting plate 1 includes a first arched portion 13 and a first plane portion 14 disposed on both sides of the first arched portion 13, and the two first plane portions 14 are respectively connected to the two sides of the first arched portion 13 along the first direction X; the second connecting plate 2 includes a second arched portion 22 and a second plane portion 23 disposed on both sides of the second arched portion 22, and the two second plane portions 23 are respectively connected to the two sides of the second arched portion 22 along the second direction Y; the turning plate 3 includes an elbow arched portion 31 and a third plane portion 32 disposed on both sides of the elbow arched portion 31, and the two third plane portions 32 are respectively disposed on both sides of the extending direction of the elbow arched portion 31. The arched structure has a good bearing capacity, and the structural strength is improved by the combination of the arched portion and the plane portion, so that the stress caused by the LNG hydraulic pressure and temperature changes can be better withstood.

[0036] Specifically, the first planar portion 14 and the second planar portion 23 provide a stable welding reference surface, and the first planar portion 14 is in direct contact with the first corrugated plate, and the second planar portion 23 is in direct contact with the second corrugated plate, which facilitates on-site installation and welding and improves installation convenience.

[0037] In some embodiments, the first positioning portion 11 is provided with overlapping ribs 12 , and the overlapping ribs 12 are continuously provided on the first arched portion 13 and the two first planar portions 14 .

[0038] In the present invention, the continuous overlap ribs 12 provide a complete positioning and sealing surface. The overlap ribs 12 run through the entire contact surface, ensuring the sealing of the entire connection area and optimizing the continuity of the structure.

[0039] Specifically, the continuous lap ribs 12 provide a clear assembly reference, and the visually identifiable continuous reference line can effectively improve the assembly efficiency during the batch storage tank assembly process.

[0040] like Figure 2 As shown, in some embodiments, the overlap ribs 12 separate the first connecting plate 1 into a first portion 15 and a second portion 16 , and a height difference is formed between the first portion 15 and the second portion 16 , and the height difference is equal to the thickness of the first connecting plate 1 .

[0041] In the present invention, an automatic positioning mechanism is formed by the height difference, the height difference is accurately matched with the thickness of the plate to be connected, and the storage tank is quickly positioned during assembly, thereby achieving an automatic positioning effect.

[0042] Specifically, the first part 15 and the second part 16 are respectively located on both sides of the extension direction of the lap rib 12, wherein the second part 16 is used to connect the first corrugated plate. The height of the first part 15 can be higher than the second part 16, and the second part 16 is inserted under the first corrugated plate and then welded; the first part 15 can also be lower than the height of the second part 16, and the second part 16 is overlapped on the top of the first corrugated plate and then welded.

[0043] Moreover, the precise height difference ensures the consistency of the weld position, and the structure ensures that the welding gap is uniform, thus ensuring the welding quality during the automated welding process.

[0044] In some embodiments, the second portion 16 is disposed away from the turning plate 3 , and the second portion 16 is disposed with equal width along a direction perpendicular to the first direction X.

[0045] In the present invention, the equal-width design facilitates standardized production. Through unified size control, the advantages of standardized manufacturing can be achieved in the mass production process, thereby improving assembly efficiency.

[0046] Moreover, the equal-width design ensures uniform stress distribution and consistent cross-sectional area, which optimizes stress distribution when subjected to temperature stress and pressure, thereby reducing stress concentration when the storage tank is subjected to temperature stress and pressure, and ensuring long-term stable operation of the storage tank.

[0047] like Figure 3-6 As shown, in some embodiments, the first arch portion 13 includes a first arch 131 and a first rounded corner 132 arranged on both sides of the first arch 131, and the first arch 131 and the first plane portion 14 are smoothly transitioned through the first rounded corner 132; the second arch portion 22 includes a second arch 221 and a second rounded corner 222 arranged on both sides of the second arch 221, and the second arch 221 and the second plane portion 23 are smoothly transitioned through the second rounded corner 222; the elbow arch portion 31 includes a third arch 311 and a third rounded corner 312 arranged on both sides of the third arch 311, and the third arch 311 and the third plane portion 32 are smoothly transitioned through the third rounded corner 312.

[0048] In the present invention, the first arched portion 13 includes a first rounded arch 131 and first rounded corners 132 on both sides of the first rounded arch 131 along the first direction X, so as to realize a smooth transition of the rounded corners between the first rounded arch 131 and the first plane portion 14; the second arched portion 22 includes a second rounded arch 221 and second rounded corners 222 on both sides of the second rounded arch 221 along the second direction Y, so as to realize a smooth transition of the rounded corners between the second rounded arch 221 and the second plane portion 23; the elbow arched portion 31 includes a third rounded arch 311 and third rounded corners 312 connected on both sides of the third rounded arch 311 along the extension direction, so as to realize a smooth transition of the rounded corners between the third rounded arch 311 and the third plane portion 32. Stress concentration is avoided by rounded corner transition, smooth transition is realized by continuous curved surface, stress transition is optimized, and stress can be effectively dispersed in a low temperature environment.

[0049] Moreover, by improving fatigue life through smooth transition and avoiding geometric discontinuities, the reliability of the structure can be effectively improved when subjected to cyclic temperature stress.

[0050] Specifically, the first plane portion 14, the second plane portion 23 and the third plane portion 32 are coplanar and form a reference plane, the width of the orthographic projection of the first circular arch 131 in the reference plane remains unchanged, the width of the orthographic projection of the second circular arch 221 in the reference plane remains unchanged, the width of the orthographic projection of the third circular arch 311 in the reference plane remains unchanged, and the projections of the first circular arch 131, the second circular arch 221 and the third circular arch 311 in the reference plane are continuously arranged with equal widths, which facilitates positioning and matching when assembling with other parts.

[0051] In some embodiments, two ends of the third arch 311 along the extension direction are respectively connected to the first arch 131 and the second arch 221 , and two ends of the third fillet 312 along the extension direction are respectively connected to the first fillet 132 and the second fillet 222 .

[0052] In the present invention, the two ends of the third arch 311 along the extension direction are respectively connected to the first arch 131 and the second arch 221, and the two ends of the third fillet 312 along the extension direction are respectively connected to the first fillet 132 and the second fillet 222, so as to realize the continuous transition of the elbow arch portion 31, the first arch portion 13 and the second arch portion 22, and the continuous transition of the arcs and fillets of each part, realize all-round structural transition, improve the continuity of the overall structure, and can effectively cope with complex stress conditions.

[0053] In some embodiments, the first connecting plate 1 is disposed in a mirror image with respect to a center line of the first arched portion 13 , and the second connecting plate 2 is disposed in a mirror image with respect to a center line of the second arched portion 22 .

[0054] In the present invention, the mirror symmetric design simplifies the manufacturing process, and the structures on both sides of the center line are completely symmetrical. The same mold can be used to complete the processing on both sides, realizing a mass production process. Moreover, the symmetrical structure is evenly stressed, the load is evenly distributed along the center line, the stress distribution is symmetrical, the deformation trend is controllable, and the mechanical properties are optimized. It can effectively deal with temperature stress, internal pressure conditions and external load influences.

[0055] In some embodiments, the elbow plate is integrally formed.

[0056] In the present invention, the elbow plate is integrally formed, the connection point is eliminated, the structural integrity is improved, the overall performance is improved, and the sealing requirements in a low temperature environment are met. Moreover, the mold can be formed in one step, the assembly process can be reduced, batch production can be achieved, and production efficiency can be improved.

[0057] Specifically, the design without connection points can reduce potential failure points and lower maintenance costs.

[0058] The elbow plate is turned by the turning plate 3, the first connecting plate 1 extends along the first direction X and is connected to the first corrugated plate through the first positioning portion 11, the second connecting plate 2 extends along the second direction Y and is connected to the second corrugated plate through the second positioning portion 21, and the first connecting plate 1 and the second connecting plate 2 extend in a straight line, which is convenient for connecting with the first corrugated plate and the second corrugated plate, and the overlapping ribs 12 play a positioning function, thereby improving the assembly efficiency and the sealing effect of the storage tank at the elbow plate in the later stage.

[0059] An embodiment of the present invention provides a liquefied natural gas storage tank, comprising: a first corrugated plate and a second corrugated plate; and the above-mentioned elbow plate, wherein the elbow plate is used to connect the first corrugated plate and the second corrugated plate.

[0060] In the present invention, the positioning part and the corrugated plate are precisely matched, so that standardized connection is achieved during the assembly process of the LNG storage tank system, and the system integration is optimized. Through the standardized interface design, the prefabricated parts can be quickly assembled during the on-site installation at the shipyard, thereby improving the convenience of construction. Through the precisely matched connection structure, the connection points are reduced and the integrity is improved to ensure long-term operation in a low-temperature environment and the reliability of the system operation.

[0061] Specifically, the first corrugated plate is the bottom corrugated plate of the storage tank, the second corrugated plate is the 90° corner corrugated plate of the storage tank, and the elbow plate is used to connect the bottom corrugated plate and the 90° corner corrugated plate. The positioning and matching of the elbow plate and other parts are convenient and accurate, and the thickness reduction of the plate blank is greatly reduced during the deep drawing of the elbow shape; the shape design is optimized through finite element analysis to ensure that the connection with the corrugated plate is tighter and stress concentration is reduced; more precise forming process and online monitoring equipment are used to ensure the consistency of material thickness; materials with higher strength and fatigue resistance are selected, or fatigue resistance is improved through surface treatment and prestressing technology; and stricter quality control is introduced in the design and production stages to ensure that each elbow plate is strictly inspected and tested, and the storage tank is regularly maintained and inspected to promptly detect and replace the elbow plate with problems to improve the overall performance of the elbow plate and ensure its long-term stable operation in the LNG membrane storage tank. At the same time, a left-right symmetrical part is formed with the central axis of the elbow plate as the reference during forming. The required asymmetric parts are obtained by cutting at a later stage, thus avoiding instability during the forming process.

[0062] An embodiment of the present invention provides an assembly ship, comprising the above-mentioned liquefied natural gas storage tank.

[0063] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An elbow plate, characterized in that: include: A first connecting plate (1) extending along a first direction, the first connecting plate (1) having a first positioning portion (11) for connecting to the first corrugated plate; A second connecting plate (2) extending along a second direction, the second connecting plate (2) having a second positioning portion (21) for connecting to a second corrugated plate; a turning plate (3), one end of the turning plate (3) being connected to an end of the first connecting plate (1) away from the first positioning portion (11), and the other end of the turning plate (3) being connected to an end of the second connecting plate (2) away from the second positioning portion (21); Wherein, the first positioning portion (11) and / or the second positioning portion (21) is provided with a lap rib (12); and the first direction is arranged to intersect with the second direction.

2. The elbow plate according to claim 1, characterized in that: The first connecting plate (1) comprises a first arched portion (13) extending along the first direction and first plane portions (14) arranged on both sides of the first arched portion (13); the second connecting plate (2) comprises a second arched portion (22) extending along the second direction and second plane portions (23) arranged on both sides of the second arched portion (22); the turning plate (3) comprises an elbow arched portion (31) and third plane portions (32) arranged on both sides of the elbow arched portion (31), the two ends of the elbow arched portion (31) along the extension direction are respectively connected to the first arched portion (13) and the second arched portion (22), and the two ends of the third plane along the extension direction are respectively connected to the first plane portion (14) and the second plane portion (23).

3. The elbow plate according to claim 2, characterized in that: The first positioning portion (11) is provided with the overlapping ribs (12), and the overlapping ribs (12) are continuously provided on the first arched portion (13) and the two first plane portions (14).

4. The elbow plate according to claim 3, characterized in that: The overlapping ribs (12) separate the first connecting plate (1) into a first part (15) and a second part (16), and a height difference is formed between the first part (15) and the second part (16), and the height difference is equal to the thickness of the first connecting plate (1).

5. The elbow plate according to claim 4, characterized in that: The second portion (16) is arranged away from the turning plate (3), and the second portion (16) is arranged with equal width in a direction perpendicular to the first direction.

6. The elbow plate according to claim 2, characterized in that: The first arched portion (13) comprises a first arch (131) and first rounded corners (132) arranged on both sides of the first arch (131), and the first arch (131) and the first plane portion (14) are smoothly transitioned through the first rounded corners (132); the second arched portion (22) comprises a second arch (221) and second rounded corners (222) arranged on both sides of the second arch (221), and the second arch (221) and the second plane portion (23) are smoothly transitioned through the second rounded corners (222); the elbow arched portion (31) comprises a third arch (311) and third rounded corners (312) arranged on both sides of the third arch (311), and the third arch (311) and the third plane portion (32) are smoothly transitioned through the third rounded corners (312).

7. The elbow plate according to claim 6, characterized in that: Two ends of the third round arch (311) along the extension direction are respectively connected to the first round arch (131) and the second round arch (221), and two ends of the third round corner (312) along the extension direction are respectively connected to the first round corner (132) and the second round corner (222).

8. The elbow plate according to claim 2, characterized in that: The first connecting plate (1) is arranged in a mirror image with respect to a center line of the first arched portion (13), and the second connecting plate (2) is arranged in a mirror image with respect to a center line of the second arched portion (22).

9. The elbow plate according to any one of claims 1 to 8, characterized in that: The elbow plate is integrally formed.

10. A liquefied natural gas storage tank, characterized in that: include: a first corrugated sheet and a second corrugated sheet; And the elbow plate according to any one of claims 1 to 9, wherein the elbow plate is used to connect the first corrugated plate and the second corrugated plate.

11. An assembled ship, characterized in that: Comprising the liquefied natural gas storage tank as claimed in claim 10.

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