Elbow plate, liquefied natural gas storage tank and assembling ship

Abstract

The present application relates to liquefied gas storage device technical field, especially to a bend plate, a liquefied natural gas storage tank and an assembling ship, the bend plate provided by the present application comprises a first connecting plate, a second connecting plate and a turning plate, the first connecting plate is arranged in extension along a first direction, the first connecting plate is provided with a first positioning part for connecting a first corrugated plate; the second connecting plate is arranged in extension along a second direction, the second connecting plate is provided with a second positioning part for connecting a second corrugated plate; one end of the turning plate is connected to one end of the first connecting plate away from the first positioning part, and the other end is connected to one end of the second connecting plate away from the second positioning part; the first positioning part and / or the second positioning part are provided with a lapping rib; the first direction and the second direction are arranged in intersection, the bend plate provided by the present application is convenient for positioning and assembling with other corrugated plates, improves the assembling efficiency and the sealing effect of the storage tank at the bend plate in the later period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquefied gas storage equipment, in particular to a bend plate, a liquefied natural gas storage tank and an assembling ship. BACKGROUND

[0002] Compared with gaseous form, liquefied natural gas (LNG) has the advantages of easier storage and transportation. Among many devices in an LNG receiving station, a storage tank for storing LNG is the most difficult to construct, has the highest investment and the longest construction period.

[0003] At present, LNG storage in China mainly adopts tank storage, and the tank types are divided into traditional full containment tanks and emerging thin film tanks. The full containment tank is made of 9% nickel steel plate by butt welding, and the thin film tank is made of stainless steel plate with corrugated edges by edge welding. Compared with the full containment tank, the thin film inner tank is made of corrugated plate units by edge welding, thereby avoiding weld stress, and the corrugations on the corrugated plate can better absorb and release energy when the tank body injects and outputs natural gas, which is more economical and practical, has larger effective volume, and is a more advanced tank.

[0004] The bend plate is an important component of the LNG thin film tank, which directly contacts with LNG and is connected with other corrugated plates to play a sealing role. The current bend plate has poor positioning effect when assembled with other corrugated plates, thereby affecting the assembly efficiency and the sealing effect of the storage tank at the bend plate after assembly. SUMMARY

[0005] The present application provides a bend plate, a liquefied natural gas storage tank and an assembling ship, which facilitates positioning and assembly with other corrugated plates, improves assembly efficiency and sealing effect of the storage tank at the bend plate in the later period.

[0006] In a first aspect, the present application provides a bend plate, comprising: a first connecting plate extending in a first direction, the first connecting plate having a first positioning portion for connecting a first corrugated plate; a second connecting plate extending in a second direction, the second connecting plate having a second positioning portion for connecting a second corrugated plate; a turning plate, one end of the turning plate being connected to one end of the first connecting plate away from the first positioning portion, and the other end of the turning plate being connected to one end of the second connecting plate away from the second positioning portion; wherein the first positioning portion and / or the second positioning portion is provided with an edge connecting rib; and the first direction and the second direction are arranged intersectingly.

[0007] In a possible implementation, the first connecting plate comprises a first arched portion extending along a first direction and first flat portions arranged on both sides of the first arched portion; the second connecting plate comprises a second arched portion extending along a second direction and second flat portions arranged on both sides of the second arched portion; the elbow plate comprises an elbow arched portion and third flat portions arranged on both sides of the elbow arched portion, the elbow arched portion is connected to the first arched portion and the second arched portion at two ends along the extending direction respectively, and the third flat portions are connected to the first flat portions and the second flat portions at two ends along the extending direction respectively.

[0008] In a possible implementation, the first positioning portion is provided with a lapping rib, and the lapping rib is continuously arranged on the first arched portion and the two first flat portions.

[0009] In a possible implementation, the lapping rib divides the first connecting plate into a first portion and a second portion, and a height difference is formed between the first portion and the second portion, and the height difference is equal to the thickness of the first connecting plate.

[0010] In a possible implementation, the second portion is arranged away from the elbow 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 comprises a first circular arch and first fillets arranged on both sides of the first circular arch, and the first circular arch and the first flat portions are smoothly connected through the first fillets; the second arched portion comprises a second circular arch and second fillets arranged on both sides of the second circular arch, and the second circular arch and the second flat portions are smoothly connected through the second fillets; and the elbow arched portion comprises a third circular arch and third fillets arranged on both sides of the third circular arch, and the third circular arch and the third flat portions are smoothly connected through the third fillets.

[0012] In a possible implementation, the third circular arch is connected to the first circular arch and the second circular arch at two ends along the extending direction respectively, and the third fillets are connected to the first fillets and the second fillets at two ends along the extending direction respectively.

[0013] In a possible implementation, the first connecting plate is arranged in mirror image about a center line of the first arched portion, and the second connecting plate is arranged in mirror image about 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 application provides a liquefied natural gas storage tank, comprising: a first corrugated plate and a second corrugated plate; and the above-mentioned elbow plate, which is used to connect the first corrugated plate and the second corrugated plate.

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

[0017] The elbow plate, liquefied natural gas storage tank and assembled ship provided by the application realize turning through a turning plate, a first connecting plate extends in a first direction and is connected with a first corrugated plate through a first positioning part, a second connecting plate extends in a second direction and is connected with a second corrugated plate through a second positioning part, and the first connecting plate and the second connecting plate extend in a straight line, which facilitates the connection with the first corrugated plate and the second corrugated plate, and the edge stiffener plays a positioning function, improving the assembly efficiency and the sealing effect of the storage tank at the elbow plate in the later stage. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0019] Figure 1 is a perspective structural schematic view of an elbow plate provided by the application.

[0020] Figure 2 is a structural schematic view of the elbow plate provided by the application from a side view of the first connecting plate.

[0021] Figure 3 is a structural schematic view of the elbow plate provided by the application from a top view.

[0022] Figure 4 is a structural schematic view of the elbow plate provided by the application from another view.

[0023] Figure 5 is Figure 4 is a sectional structural schematic view along the A-A direction.

[0024] Figure 6 is Figure 4 is a sectional structural schematic view along the D-D direction.

[0025] REFERENCE NUMERALS:

[0026] X, first direction; Y, second direction.

[0027] 1, first connecting plate; 11, first positioning part; 12, edge stiffener; 13, first arched part; 131, first circular arch; 132, first round corner; 14, first planar part; 15, first part; 16, second part.

[0028] 2, second connecting plate; 21, second positioning part; 22, second arched part; 221, second circular arch; 222, second round corner; 23, second planar part.

[0029] 3, turning plate; 31, elbow arch part; 311, third circular arch; 312, third fillet; 32, third planar part. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0031] The present application will be described below with reference to the drawings. Figures 1-6 The embodiment of the present application provides a bend plate, which comprises a first connecting plate 1, a second connecting plate 2 and a turning plate 3, wherein:

[0032] The first connecting plate 1 is arranged to extend along a first direction X, and the first connecting plate 1 is provided with a first positioning part 11 for connecting a first corrugated plate.

[0033] The second connecting plate 2 is arranged to extend along a second direction Y, and the second connecting plate 2 is provided with a second positioning part 21 for connecting a second corrugated plate.

[0034] One end of the turning plate 3 is connected to an end of the first connecting plate 1 away from the first positioning part 11, and the other end of the turning plate 3 is connected to an end of the second connecting plate 2 away from the second positioning part 21.

[0035] The first positioning part 11 and / or the second positioning part 21 are provided with a lapping rib 12, and the first direction X and the second direction Y are arranged to intersect.

[0036] In the present application, the turning is realized 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 part 11, the second connecting plate 2 extends along the second direction Y and is connected to the second corrugated plate through the second positioning part 21, the first connecting plate 1 and the second connecting plate 2 are arranged to extend along a straight line, which facilitates the connection with the first corrugated plate and the second corrugated plate, and the lapping rib 12 can play a positioning function during assembly, thereby improving the assembly efficiency and the sealing effect of the storage tank at the bend plate in the later period.

[0037] In the related art, the current bend plate adopts a continuous corner form, and when the two ends are connected to the first corrugated plate and the second corrugated plate respectively, the mismatching situation is prone to occur, which affects the assembly precision and efficiency of the bend plate and the corrugated plate.

[0038] And in the embodiments provided by the present application, by dividing the elbow plate into the first connecting plate 1, the turning plate 3 and the second connecting plate 2, the first connecting plate 1 and the second connecting plate 2 respectively extend along a straight line, the influence of uncertain factors at the corner can be effectively reduced, the first corrugated plate and the second corrugated plate on both sides can be more conveniently connected, and through the flange rib 12 arranged at the first positioning portion 11 and the second positioning portion 21, the positioning effect can be further achieved to assemble the first corrugated plate or the second corrugated plate, thereby improving the assembly efficiency, and the assembly precision of the elbow plate and the first corrugated plate and the second corrugated plate on both sides can be ensured, and the sealing effect of the subsequent storage tank at the elbow plate can be ensured.

[0039] Specifically, the elbow plate is applied to the corner of the liquefied natural gas storage tank, that is, the bottom corrugated plate and the 90° corner corrugated plate of the storage tank are connected, the first connecting plate 1 of one elbow plate connects the bottom corrugated plate, and the second connecting plate 2 connects the 90° corner corrugated plate. At the corner of one storage tank, two elbow plates are generally arranged to ensure the structural strength and sealing effect at the corner of the storage tank.

[0040] In actual application, the flange rib 12 forms a physical positioning reference, and through the cooperation of the flange rib 12 and the corrugated plate, the flange rib 12 can ensure the accuracy of the installation position of the corrugated plate during the assembly of the LNG storage tank, thereby improving the positioning accuracy.

[0041] Among them, the first direction X and the second direction Y are intersected to adapt to the corner requirement, the smooth transition of the two directions is realized through the turning plate 3, the first corrugated plate and the second corrugated plate at the corner of the storage tank are connected, and the connecting structure is optimized. Moreover, the step structure formed by the flange rib 12 provides a reliable sealing surface, and through the close fitting of the flange rib 12 and the corrugated plate, LNG storage in a low-temperature environment of-162℃ can be realized, and the sealing performance is improved.

[0042] As shown in Figure 1 、 5 , 6, in some embodiments, the first connecting plate 1 includes a first arched portion 13 extending along the first direction X and first planar portions 14 arranged on both sides of the first arched portion 13; the second connecting plate 2 includes a second arched portion 22 extending along the second direction Y and second planar portions 23 arranged on both sides of the second arched portion 22; the turning plate 3 includes an elbow arched portion 31 and third planar 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 planar along the extension direction are respectively connected to the first planar portion 14 and the second planar portion 23.

[0043] In the present application, the first connecting plate 1 comprises a first arched portion 13 and first flat portions 14 arranged on both sides of the first arched portion 13, and the two first flat portions 14 are respectively connected to both sides of the first arched portion 13 along the first direction X; the second connecting plate 2 comprises a second arched portion 22 and second flat portions 23 arranged on both sides of the second arched portion 22, and the two second flat portions 23 are respectively connected to both sides of the second arched portion 22 along the second direction Y; the elbow plate 3 comprises an elbow arched portion 31 and third flat portions 32 arranged on both sides of the elbow arched portion 31, and the two third flat portions 32 are respectively arranged on both sides of the extension direction of the elbow arched portion 31. The arched structure has good bearing capacity, and the combination of the arched portion and the flat portion improves the structural strength and can better withstand the stress caused by LNG hydraulic pressure and temperature changes.

[0044] Specifically, the first flat portion 14 and the second flat portion 23 provide a stable welding reference surface, and the first flat portion 14 is in direct contact with the first corrugated plate, and the second flat portion 23 is in direct contact with the second corrugated plate, which facilitates on-site installation and welding and improves the convenience of installation.

[0045] In some embodiments, the first positioning portion 11 is provided with a lapping rib 12, and the lapping rib 12 is continuously arranged on the first arched portion 13 and the two first flat portions 14.

[0046] In the present application, the continuous lapping rib 12 provides a complete positioning and sealing surface, and the lapping rib 12 penetrates through the entire contact surface to ensure the sealing performance of the entire connecting area and optimize the continuity of the structure.

[0047] Specifically, the continuous lapping rib 12 provides a clear assembly reference, and the continuous reference line can be visually confirmed, which can effectively improve the assembly efficiency in the process of assembling the batch storage tank.

[0048] As shown in Figure 2 In some embodiments, the lapping rib 12 divides 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.

[0049] In the present application, an automatic positioning mechanism is formed by the height difference, and the height difference is accurately matched with the thickness of the plate to be connected, so that rapid positioning during storage tank assembly is realized to achieve the effect of automatic positioning.

[0050] Specifically, the first part 15 and the second part 16 are respectively located on both sides of the extension direction of the hemming rib 12, wherein the second part 16 is used for connecting the first corrugated plate, and the height of the first part 15 can be higher than that of the second part 16, the second part 16 is inserted below the first corrugated plate, and then welding is performed; or the height of the first part 15 is lower than that of the second part 16, the second part 16 is placed above the first corrugated plate, and then welding is performed.

[0051] Moreover, the precise height difference ensures the consistency of the position of the weld, and the uniform welding gap is ensured through the structure, so that the welding quality is ensured in the automatic welding process.

[0052] In some embodiments, the second part 16 is arranged away from the elbow plate 3, and the second part 16 is arranged with equal width along the direction perpendicular to the first direction X.

[0053] In the present application, the equal-width design facilitates standardized production, and through unified size control, the advantages of standardized manufacturing can be realized in the process of mass production, thereby improving the assembly efficiency.

[0054] Moreover, the equal-width design makes the stress distribution uniform, maintains the consistent cross-sectional area, optimizes the stress distribution when bearing temperature stress and pressure, thereby reducing the stress concentration of the storage tank when bearing temperature stress and pressure, and ensuring the long-term stable operation of the storage tank.

[0055] As shown in Figures 3-6 In some embodiments, the first arched part 13 includes a first circular arch 131 and first fillets 132 arranged on both sides of the first circular arch 131, and the first circular arch 131 and the first planar part 14 are smoothly connected through the first fillets 132; the second arched part 22 includes a second circular arch 221 and second fillets 222 arranged on both sides of the second circular arch 221, and the second circular arch 221 and the second planar part 23 are smoothly connected through the second fillets 222; the elbow arched part 31 includes a third circular arch 311 and third fillets 312 arranged on both sides of the third circular arch 311, and the third circular arch 311 and the third planar part 32 are smoothly connected through the third fillets 312.

[0056] In the application, the first arc-shaped part 13 comprises a first circular arch 131 and a first fillet 132 on both sides of the first circular arch 131 along the first direction X, realizing smooth transition of the first circular arch 131 and the first fillet 132 and the first flat part 14; the second arc-shaped part 22 comprises a second circular arch 221 and a second fillet 222 on both sides of the second circular arch 221 along the second direction Y, realizing smooth transition of the second circular arch 221 and the second fillet 222 and the second flat part 23; the elbow arc-shaped part 31 comprises a third circular arch 311 and a third fillet 312 connected on both sides of the third circular arch 311 along the extension direction, realizing smooth transition of the third circular arch 311 and the third fillet 312 and the third flat part 32. The stress concentration is avoided by the fillet transition, and the smooth transition is realized by the continuous curved surface, and the stress transition is optimized, so that the stress can be effectively dispersed in the low-temperature environment.

[0057] Moreover, the fatigue life is improved by the smooth transition, the geometric discontinuity is avoided, and the reliability of the structure can be effectively improved when the cyclic temperature stress is borne.

[0058] Specifically, the first flat part 14, the second flat part 23 and the third flat part 32 are coplanar and form a reference plane, the width of the first circular arch 131 in the orthographic projection in the reference plane is constant, the width of the second circular arch 221 in the orthographic projection in the reference plane is constant, the width of the third circular arch 311 in the orthographic projection in the reference plane is constant, 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 width. When assembled with other parts, positioning and cooperation are facilitated.

[0059] In some embodiments, the third circular arch 311 is connected with the first circular arch 131 and the second circular arch 221 at both ends along the extension direction, and the third fillet 312 is connected with the first fillet 132 and the second fillet 222 at both ends along the extension direction.

[0060] In the application, the third circular arch 311 is connected with the first circular arch 131 and the second circular arch 221 at both ends along the extension direction, and the third fillet 312 is connected with the first fillet 132 and the second fillet 222 at both ends along the extension direction, realizing continuous transition of the elbow arc-shaped part 31, the first arc-shaped part 13 and the second arc-shaped part 22, continuous transition of the circular arcs and the fillets of each part, realizing all-around structure transition, improving the continuity of the overall structure, and effectively coping with complex stress working conditions.

[0061] In some embodiments, the first connecting plate 1 is mirror-symmetrically arranged about the center line of the first arc-shaped part 13, and the second connecting plate 2 is mirror-symmetrically arranged about the center line of the second arc-shaped part 22.

[0062] In the application, the mirror symmetry design simplifies the manufacturing process, and the structure on both sides of the center line is completely symmetrical, so the same mold can be used to complete the processing of both sides, realizing batch production process.

[0063] In some embodiments, the elbow plate is integrally formed.

[0064] In the application, the elbow plate is integrally formed, eliminating the connection points, improving the structural integrity, improving the overall performance, and meeting the sealing requirements in low temperature environment. Moreover, one-time molding of the mold can be realized, reducing the assembly process, realizing batch production, and improving production efficiency.

[0065] Specifically, through the design without connection points, the potential failure points are reduced, and the maintenance cost is reduced.

[0066] The elbow plate realizes turning through the turning plate 3, the first connecting plate 1 extends along the first direction X and is connected with the first corrugated plate through the first positioning part 11, the second connecting plate 2 extends along the second direction Y and is connected with the second corrugated plate through the second positioning part 21, and through the form of the first connecting plate 1 and the second connecting plate 2 extending along a straight line, the first corrugated plate and the second corrugated plate are conveniently connected, and through the edge overlapping rib 12, the positioning function is played, the assembly efficiency is improved, and the sealing effect of the storage tank at the elbow plate in the later stage is improved.

[0067] The embodiment of the application provides a liquefied natural gas storage tank, which comprises a first corrugated plate and a second corrugated plate, and the elbow plate described above, and the elbow plate is used for connecting the first corrugated plate and the second corrugated plate.

[0068] In the application, through the precise cooperation of the positioning part and the corrugated plate, standardized connection is realized in the LNG storage tank system assembly process, and system integration is optimized. Through the standardized interface design, when the shipyard site is installed, prefabricated parts can be quickly assembled, and then the convenience of construction is improved. Through the precise cooperation of the connecting structure, the connection points are reduced, the integrity is improved, so that long-term operation in a low temperature environment is ensured, and the reliability of system operation is ensured.

[0069] Specifically, the first corrugated plate is a tank bottom corrugated plate of the storage tank, the second corrugated plate is a 90° corner corrugated plate of the storage tank, and the elbow plate is used for connecting the tank bottom corrugated plate and the 90° corner corrugated plate. The elbow plate is convenient and accurate in positioning and cooperation when assembled with other parts, and the thickness reduction of the plate blank is greatly reduced when the elbow shape is drawn into a shape; the shape is optimized through finite element analysis to ensure that the connection with the corrugated plate is more compact and the stress concentration is reduced; a more accurate forming process and online monitoring equipment are used to ensure the consistency of the material thickness; a material with higher strength and fatigue resistance is selected, or the fatigue resistance is improved through surface treatment and prestress technology; and more stringent quality control is introduced in the design and production stage to ensure that each elbow plate is strictly tested and tested, and the storage tank is regularly maintained and inspected to find and replace the elbow plate in time, so as to improve the overall performance of the elbow plate and ensure its long-term stable operation in the LNG thin film type storage tank. At the same time, symmetrical parts are formed around the center axis of the elbow plate during forming. The required asymmetric parts are obtained by cutting in the later stage, avoiding instability in the forming process.

[0070] The embodiment of the present application provides an assembled ship, comprising the liquefied natural gas storage tank.

[0071] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment scheme. Those skilled in the art can understand and implement without creative labor.

[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An elbow plate, characterized in that, include: The first connecting plate (1) extends linearly along a first direction and has a first positioning part (11) for connecting the first corrugated plate. The second connecting plate (2) extends straight along the second direction and has a second positioning part (21) for connecting the 90° corner corrugated plate. The turning plate (3) is projected as a fan ring in the horizontal direction. One end of the turning plate (3) is connected to the end of the first connecting plate (1) away from the first positioning part (11), and the other end is connected to the end of the second connecting plate (2) away from the second positioning part (21). The first positioning part (11) and / or the second positioning part (21) are provided with overlapping ribs (12); the first direction and the second direction are intersecting.

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

3. The elbow plate according to claim 2, characterized in that, The first positioning part (11) is provided with the edge reinforcement (12), which is continuously provided on the first arched part (13) and the two first planar parts (14).

4. The elbow plate according to claim 3, characterized in that, The lap reinforcement (12) divides 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), the height difference being equal to the thickness of the first connecting plate (1).

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

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

7. The elbow plate according to claim 6, characterized in that, The third arch (311) is connected to the first arch (131) and the second arch (221) at both ends along the extension direction, and the third rounded corner (312) is connected to the first rounded corner (132) and the second rounded corner (222) at both ends along the extension direction.

8. The elbow plate according to claim 2, characterized in that, The first connecting plate (1) is mirrored about the center line of the first arched portion (13), and the second connecting plate (2) is mirrored about the center line of the second arched portion (22).

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

10. A liquefied natural gas storage tank, characterized in that, include: First corrugated plate and 90° corner corrugated plate; And the elbow plate as described in any one of claims 1-9, the elbow plate being used to connect the first corrugated plate and the 90° corner corrugated plate.

11. An assembled ship, characterized in that, Including the liquefied natural gas storage tank as described in claim 10.

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