90-degree corrugated corner plate of marine liquid cargo tank and liquefied natural gas storage tank

Abstract

The invention relates to the technical field of liquefied gas storage equipment, in particular to a 90-degree corrugated corner plate of a marine liquid cargo tank and a liquefied natural gas storage tank, the corrugated corner plate comprises a first connecting plate, a second connecting plate and a buffer plate, the first connecting plate is used for connecting a tank bottom corrugated plate, and the second connecting plate is used for connecting a tank bottom corrugated plate; the first connecting plate comprises two first plate bodies and a first corrugated plate for connecting the two first plate bodies; the second connecting plate is used for connecting the side wall corrugated plate and comprises two second plate bodies and a second corrugated plate for connecting the two second plate bodies; the buffer plate comprises two first buffer parts and a second buffer part connected with the two first buffer parts, the two ends of the second buffer part are connected with the first corrugated plate and the second corrugated plate correspondingly, and the second buffer part comprises a first connecting plate, a second connecting plate and a third connecting plate; according to the corrugated corner plate, external force encountered in the ship running process can be effectively dispersed, then the situation that the corrugated corner plate deforms and is damaged is reduced, and the safety of the storage tank is improved.

Description

Technical Field

[0001] The invention relates to the technical field of liquefied gas storage equipment, and in particular to a 90-degree corrugated corner plate of a marine liquid cargo tank and a liquefied natural gas storage tank. Background Art

[0002] With the adjustment of the global energy structure and the growing demand for clean energy, liquefied natural gas (LNG), as an efficient and clean energy, has become increasingly prominent in the energy market. In the field of marine transportation, the demand for marine liquefied natural gas storage tanks is also increasing.

[0003] In recent years, governments around the world have introduced policies to encourage the development and application of clean energy. In my country, in order to promote energy transformation and reduce environmental pollution, vigorously developing the natural gas industry has become an important strategic direction. The country actively promotes the application of natural gas in the transportation field, especially the promotion of marine liquefied natural gas. As one of the key equipment of ships, the technological innovation of marine liquefied natural gas storage tanks is in line with the national industrial policy orientation and is of great significance for promoting the high-end and green development of my country's shipbuilding industry.

[0004] Among them, the 90° corrugated corner plate of the marine liquid cargo tank plays the role of connecting the corrugated plate of the tank side wall and the corrugated plate of the tank bottom, and at the same time, the airtightness of the connection must be ensured. During the operation of the ship, the storage tank needs to withstand external forces such as wind, waves, and vibration. The current 90° corrugated corner plate of the marine liquid cargo tank cannot disperse these external forces, resulting in deformation and damage at the 90° corrugated corner plate of the marine liquid cargo tank, thereby affecting the safety of the storage tank. Summary of the invention

[0005] The present invention provides a 90° corrugated corner plate of a marine liquid cargo tank and a liquefied natural gas storage tank. The 90° corrugated corner plate of the marine liquid cargo tank can effectively disperse the external force encountered during the operation of the ship, thereby reducing the deformation and damage of the 90° corrugated corner plate of the marine liquid cargo tank and improving the safety of the storage tank.

[0006] In the first aspect, an embodiment of the present invention provides a 90° corrugated corner plate of a marine liquid cargo tank, which is applied to a natural gas storage tank. The natural gas storage tank includes a tank bottom corrugated plate and a side wall corrugated plate. The 90° corrugated corner plate of the marine liquid cargo tank includes: a first connecting plate for connecting the tank bottom corrugated plate, the first connecting plate includes two first plate bodies and a first corrugated plate connecting the two first plate bodies; a second connecting plate for connecting the side wall corrugated plate, the second connecting plate includes two second plate bodies and a second corrugated plate connecting the two second plate bodies; a buffer plate includes two first buffer parts and a second buffer part connecting the two first buffer parts, and the second buffer part The two ends of the punching part are respectively connected to the first corrugated plate and the second corrugated plate, one end of the two first buffer parts is respectively connected to the two first plate bodies, and the other ends of the two first buffer parts are respectively connected to the two second plate bodies; wherein the second buffer part includes a first connecting plate, a second connecting plate and a third connecting plate, the first connecting plate is connected to the first corrugated plate and forms an angle a with the first corrugated plate, the second connecting plate is connected to the second corrugated plate and forms an angle b with the second corrugated plate, the third buffer is connected to the first connecting plate and the second connecting plate, the third connecting plate and the first connecting plate form an angle c, and the third connecting plate and the second connecting plate form an angle d.

[0007] In a possible implementation, angle a, angle b, angle c, and angle d are all acute angles.

[0008] In a possible implementation, angle a is equal to angle b, and angle c is equal to angle d.

[0009] In a possible implementation, the first connecting plate and the first corrugated plate have a smooth transition, the second connecting plate and the second corrugated plate have a smooth transition, and both ends of the third connecting plate have a smooth transition with the first connecting plate and the second connecting plate, respectively.

[0010] In a possible implementation, a plane where the first plate body is located and a plane where the second plate body is located define a central interface, and the first connecting plate and the second connecting plate are mirror-imaged with respect to the central interface.

[0011] In a possible implementation, the buffer plate is mirrored about the central interface.

[0012] In a possible implementation manner, an extension direction of the first connecting plate is perpendicular to an extension direction of the second connecting plate.

[0013] In a possible implementation, there is a smooth transition between the first buffer portion and the first plate body, and there is a smooth transition between the first buffer portion and the second plate body.

[0014] In a possible implementation, both the first corrugated plate and the second corrugated plate are in a circular arch shape, the first corrugated plate smoothly transitions to the first plate body, and the second corrugated plate smoothly transitions to the second plate body.

[0015] In the second aspect, an embodiment of the present invention provides a liquefied natural gas storage tank, comprising: a tank bottom corrugated plate and a side wall corrugated plate; and the above-mentioned 90° corrugated corner plate of the ship's liquid cargo tank, the 90° corrugated corner plate of the ship's liquid cargo tank is used to connect the tank bottom corrugated plate and the side wall corrugated plate.

[0016] The present invention provides a 90° corrugated corner plate of a marine liquid cargo tank and a liquefied natural gas storage tank. The 90° corrugated corner plate of the marine liquid cargo tank is connected to the tank bottom corrugated plate through a first connecting plate, and is connected to the side wall corrugated plate through a second connecting plate, so as to realize a reliable connection between the tank bottom and the side wall of the storage tank. The double first plate bodies and the first corrugated plate design of the first connecting plate can evenly withstand the tank bottom pressure, and the double second plate bodies and the second corrugated plate design of the second connecting plate can adapt to the deformation of the side wall; the first buffer part of the buffer plate connects the first plate body and the second plate body, and the second buffer part connects the first corrugated plate and the second corrugated plate. The second buffer part adopts a three-stage buffer structure, and a stress dispersion channel is formed by setting the angles a, b, c, and d, and a single angle is decomposed into multiple small-angle turns to avoid stress concentration, provide a buffer space for structural deformation, and can effectively disperse the external force encountered in the operation of the ship, thereby reducing the deformation and damage of the 90° corrugated corner plate of the marine liquid cargo tank, and improving the safety of the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 The present invention is a schematic diagram of the three-dimensional structure of a 90° corrugated corner plate of a marine liquid cargo tank.

[0019] Figure 2 The present invention is a schematic diagram of the orthographic projection structure of a 90° corrugated corner plate of a marine liquid cargo tank provided by the present invention on the plane where the first plate body is located.

[0020] Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure along the AA direction.

[0021] Figure 4 It is a schematic diagram of the planar structure of a 90° corrugated corner plate of a marine liquid cargo tank provided by the present invention; Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure along the BB direction; Figure 6is a schematic cross-sectional structure diagram of a first connecting plate provided by the present invention; Figure 7 It is a schematic diagram of the cross-sectional structure of a second connecting plate provided by the present invention.

[0022] Reference numerals: 1. first connecting plate; 11. first plate body; 12. first corrugated plate; 13. first smooth transition fillet; 2. second connecting plate; 21. second plate body; 22. second corrugated plate; 23. second smooth transition fillet; 3. Buffer plate; 31. First buffer portion; 32. Second buffer portion; 321. First connecting plate; 322. Second connecting plate; 323. Third connecting plate; 4. Center interface. 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 7 A 90° corrugated corner plate of a marine liquid cargo tank provided in an embodiment of the present invention is described, which is applied to a natural gas storage tank. The natural gas storage tank includes a tank bottom corrugated plate and a side wall corrugated plate. The corrugated corner plate includes: a first connecting plate 1, a second connecting plate 2 and a buffer plate 3, wherein: The first connecting plate 1 is used to connect the tank bottom corrugated plates. The first connecting plate 1 includes two first plate bodies 11 and a first corrugated plate 12 connecting the two first plate bodies 11 .

[0025] The second connecting plate 2 is used to connect the side wall corrugated plates. The second connecting plate 2 includes two second plate bodies 21 and a second corrugated plate 22 connecting the two second plate bodies 21 .

[0026] The buffer plate 3 includes two first buffer parts 31 and a second buffer part 32 connecting the two first buffer parts 31, the two ends of the second buffer part 32 are respectively connected to the first corrugated plate 12 and the second corrugated plate 22, one end of the two first buffer parts 31 is respectively connected to the two first plate bodies 11, and the other ends of the two first buffer parts 31 are respectively connected to the two second plate bodies 21.

[0027] like Figure 2-3As shown, the second buffer portion 32 includes a first connecting plate 321, a second connecting plate 322 and a third connecting plate 323. The first connecting plate 321 is connected to the first corrugated plate 12 and forms an angle a with the first corrugated plate 12. The second connecting plate 322 is connected to the second corrugated plate 22 and forms an angle b with the second corrugated plate 22. The third buffer connects the first connecting plate 321 and the second connecting plate 322. The third connecting plate 323 and the first connecting plate 321 form an angle c, and the third connecting plate 323 and the second connecting plate 322 form an angle d.

[0028] In the present invention, the tank bottom corrugated plate is connected by the first connecting plate 1, and the side wall corrugated plate is connected by the second connecting plate 2, so as to realize the reliable connection between the tank bottom and the side wall of the storage tank. The double first plate body 11 and the first corrugated plate 12 of the first connecting plate 1 are designed to evenly withstand the tank bottom pressure, and the double second plate body 21 and the second corrugated plate 22 of the second connecting plate 2 are designed to adapt to the deformation of the side wall; the first buffer part 31 of the buffer plate 3 connects the first plate body 11 and the second plate body 21, and the second buffer part 32 connects the first corrugated plate 12 and the second corrugated plate 22. The second buffer part 32 adopts a three-stage buffer structure, and a stress dispersion channel is formed by setting the angles a, b, c, and d, and a single angle is decomposed into multiple small-angle turns to avoid stress concentration, provide a buffer space for structural deformation, and effectively disperse the external force encountered in the operation of the ship, thereby reducing the deformation and damage of the corrugated corner plate and improving the safety of the storage tank.

[0029] In the related art, when assembling a marine liquefied natural gas storage tank, the 90° corrugated corner plate of the marine cargo tank is used to connect the tank bottom corrugated plate and the side wall corrugated plate. The storage tank needs to withstand a variety of external forces, such as wind and waves, vibration, etc. The corrugated corner plate is the transition part connecting the tank bottom corrugated plate and the side wall corrugated plate. When affected by external forces, the stress is concentrated and it is a very weak part. The current corner corrugated plate cannot disperse the stress well, so that the storage tank is prone to deformation and damage at the corner corrugated plate when affected by external forces, which in turn affects the safety of the storage tank.

[0030] The embodiment provided by the present invention provides deformation adaptability in two directions through the synergistic effect of the first corrugated plate 12 on the first connecting plate 1 and the second corrugated plate 22 on the second connecting plate 2, thereby enhancing the overall rigidity of the structure. The second buffer portion 32 adopts a three-stage buffer structure (first connecting plate 321, second connecting plate 322, and third connecting plate 323) to connect and buffer the first corrugated plate 12 and the second corrugated plate 22 where stress is relatively concentrated, similar to the principle of a shock absorber, converting instantaneous impact force into multi-stage buffering, reducing peak stress, and thus improving the stress distribution state. The external forces encountered during the operation of the ship can be effectively dispersed, thereby reducing the deformation and damage of the corrugated corner plate and improving the safety of the storage tank.

[0031] like Figure 3 As shown, in some embodiments, angle a, angle b, angle c and angle d are all acute angles.

[0032] Specifically, the structure of the first connecting plate 1 matches the structure of the corrugated plate at the bottom of the tank, so that it can be reliably connected to the corrugated plate at the bottom of the tank, and the structure of the second connecting plate 2 matches the structure of the corrugated plate at the side wall, so that it can be reliably connected to the corrugated plate at the side wall. The plane where the first connecting plate 1 is located and the plane where the second connecting plate 2 is located are generally arranged perpendicular to each other, that is, the extension direction of the first corrugated plate 12 and the extension direction of the second corrugated plate 22 are perpendicular to each other. In this scheme, the angles a, b, c and d are all acute angles, so that the vertical force is decomposed into multiple oblique components, which reduces the stress concentration in a single direction and provides a larger deformation space; and the acute angle structure increases the support area, improves the overall structural stiffness, improves the stress state, and improves the structural stability.

[0033] Specifically, the corner corrugated plate provided by the present invention can effectively cope with the pressure changes during the loading and unloading of storage tanks, the vibration impact during the navigation of ships, and the thermal stress caused by temperature changes, thereby reducing the risk of deformation and damage of storage tanks and improving safety.

[0034] In some embodiments, angle a is equal to angle b, and angle c is equal to angle d.

[0035] In the present invention, when angle a=angle b, the forces on the first connecting plate 321 and the second connecting plate 322 are balanced; when angle c=angle d, the forces on both sides of the third connecting plate 323 are symmetrical, avoiding local stress concentration. Similar to the principle of a lever, the symmetrical structure ensures torque balance and prevents torsional deformation.

[0036] Moreover, angle a is equal to angle b, and angle c is equal to angle d, which can effectively simplify the processing and manufacturing process, improve assembly accuracy, and reduce manufacturing costs. The same molds and tooling can be used in mass production, and unified testing standards and methods can be adopted. The unified inspection standards facilitate quality control, simplify the inspection procedures, and improve maintenance efficiency.

[0037] In some embodiments, the first connecting plate 321 and the first corrugated plate 12 have a smooth transition, the second connecting plate 322 and the second corrugated plate 22 have a smooth transition, and both ends of the third connecting plate 323 have a smooth transition with the first connecting plate 321 and the second connecting plate 322 respectively.

[0038] In the present invention, the stress concentration factor is inversely proportional to the transition fillet radius, and the smooth transition can significantly reduce the stress concentration factor, eliminate stress concentration, avoid cross-sectional mutation, and improve fatigue strength.

[0039] Moreover, the smooth transition of the second buffer portion 32 itself and the smooth transition of the connection between the first corrugated plate 12 and the second corrugated plate 22 can improve the fluid dynamic performance, reduce the generation of turbulence, reduce local resistance, and improve flow stability. When the liquefied natural gas in the storage tank shakes, the liquid impact can be reduced. The structural reliability is improved, the service life is extended, the maintenance requirements are reduced, and the safety factor is increased. Under low-temperature cycle conditions, the generation of fatigue cracks can be reduced.

[0040] In some embodiments, the plane where the first plate body 11 is located and the plane where the second plate body 21 is located define a central interface 4 , and the first connecting plate 1 and the second connecting plate 2 are mirror-imaged with respect to the central interface 4 .

[0041] In the present invention, the first connecting plate 1 and the second connecting plate 2 are arranged in a mirror image with respect to the central interface 4, which realizes the symmetry of mechanical performance, ensures the coordination of deformation, and improves the overall stability. Similar to the symmetrical structural design in architectural mechanics, the load can be evenly distributed.

[0042] Moreover, it improves the accuracy of spatial positioning, facilitates installation and positioning, improves assembly efficiency, and ensures geometric accuracy. When installed on-site at the shipyard, positioning can be completed quickly. The thermal stress is balanced, the temperature deformation is symmetrical, the thermal stress is evenly distributed, and the accumulation of thermal deformation is reduced.

[0043] In some embodiments, the buffer plate 3 is mirrored with respect to the central interface 4 .

[0044] In the present invention, the buffer plate 3 has a symmetrical structure, which ensures the symmetry of the load transfer path, avoids the additional stress caused by the eccentric load, and improves the overall deformation coordination. Similar to the symmetrical arrangement principle in bridge engineering, it ensures that the force transfer path is uniform.

[0045] Moreover, the buffer plate 3 is mirror-set with respect to the central interface 4, which simplifies mold design and manufacturing, reduces positioning errors during assembly, facilitates quality control and inspection, and improves manufacturing and installation convenience.

[0046] Specifically, the first buffer portion 31 of the buffer plate 3 is mirrored about the central interface 4 , the first connecting plate 321 and the second connecting plate 322 of the second buffer portion 32 are mirrored about the central interface 4 , and the third connecting plate 323 is mirrored about the central interface 4 .

[0047] In some embodiments, an extension direction of the first connecting plate 1 is perpendicular to an extension direction of the second connecting plate 2 .

[0048] In the present invention, the first connecting plate 1 extends in the horizontal direction, and the second connecting plate 2 extends in the vertical direction. The vertical extension ensures the orthogonal connection between the tank bottom and the side wall, provides a clear force transmission direction, and optimizes space utilization. The vertical arrangement provides the best force transmission efficiency, similar to the orthogonal frame in the building structure.

[0049] Moreover, the extension direction of the first connecting plate 1 is perpendicular to the extension direction of the second connecting plate 2, providing a clear force path, improving the anti-overturning performance, enhancing the overall rigidity, and improving the structural stability. When the ship heels, the tilting moment can be effectively resisted.

[0050] Moreover, it is easy to control verticality during construction, simplify the installation process, improve construction efficiency, and enhance construction convenience.

[0051] In some embodiments, there is a smooth transition between the first buffer portion 31 and the first plate body 11 , and there is a smooth transition between the first buffer portion 31 and the second plate body 21 .

[0052] Specifically, the first buffer portion 31 is a smooth transition fillet as a whole, which connects the first plate body 11 and the second plate body 21, reduces the local stress concentration factor by eliminating geometric mutations, improves structural integrity, enhances material continuity, increases load-bearing capacity, and improves sealing performance.

[0053] In the present invention, during the tank filling process, the risk of leakage can be reduced, maintenance convenience is improved, surface treatment is convenient, corrosion hazards are reduced, the detection procedure is simplified, the maintenance cycle is extended, and the maintenance cost is reduced.

[0054] like Figure 6-7 As shown, in some embodiments, the first corrugated plate 12 and the second corrugated plate 22 are both in the shape of a circular arch, the first corrugated plate 12 smoothly transitions with the first plate body 11 , and the second corrugated plate 22 smoothly transitions with the second plate body 21 .

[0055] Specifically, the two sides of the first corrugated plate 12 are respectively connected to the two first plate bodies 11, and a first smooth transition fillet 13 is formed at the connection between the first corrugated plate 12 and the first plate body 11. The two sides of the second corrugated plate 22 are respectively connected to the two second plate bodies 21, and a second smooth transition fillet 23 is formed at the connection between the second corrugated plate 22 and the second plate body 21. Through smooth transition, the stress concentration is reduced and the fatigue life is improved. The first and second corrugated plates 12 and 22 with round arches provide the best stress distribution, enhance deformation adaptability, and improve structural stability. Similar to the arch bridge structure, the round arch can transmit pressure most effectively.

[0056] In the present invention, the first corrugated plate 12 and the second corrugated plate 22 are arranged in a circular arch shape, and the first corrugated plate 12 and the first plate body 11 have a smooth transition, and the second corrugated plate 22 and the second plate body 21 have a smooth transition, so as to adapt to the dynamic load of the storage tank during navigation, improve material utilization efficiency, reduce material stress level, improve load-bearing efficiency, save material usage, and reduce structural weight while ensuring strength.

[0057] Specifically, the arch height of the cross section of the first corrugated plate 12 is equal to the arch height of the cross section of the second corrugated plate 22, and the arch width of the cross section of the first corrugated plate 12 is equal to the arch width of the cross section of the second corrugated plate 22. The extension direction of the third connecting plate 323 is perpendicular to the central interface 4, that is, the angle between the extension direction of the third connecting plate 323 and the plane where the first plate body 11 is located is 45°, and the angle between the extension direction of the third connecting plate 323 and the plane where the second plate body 21 is located is 45°.

[0058] The 90° corrugated corner plate of the marine liquid cargo tank is connected to the tank bottom corrugated plate through the first connecting plate 1, and is connected to the side wall corrugated plate through the second connecting plate 2, so as to realize the reliable connection between the tank bottom and the side wall of the storage tank. The double first plate body 11 and the first corrugated plate 12 of the first connecting plate 1 are designed to evenly withstand the tank bottom pressure, and the double second plate body 21 and the second corrugated plate 22 of the second connecting plate 2 are designed to adapt to the deformation of the side wall; the first buffer part 31 of the buffer plate 3 connects the first plate body 11 and the second plate body 21, and the second buffer part 32 connects the first corrugated plate 12 and the second corrugated plate 22. The second buffer part 32 adopts a three-stage buffer structure, and a stress dispersion channel is formed by setting the angles a, b, c, and d, and a single angle is decomposed into multiple small-angle turns to avoid stress concentration, provide a buffer space for structural deformation, and effectively disperse the external force encountered during the operation of the ship, thereby reducing the deformation and damage of the corrugated corner plate and improving the safety of the storage tank.

[0059] An embodiment of the present invention provides a liquefied natural gas storage tank, comprising: a tank bottom corrugated plate and a side wall corrugated plate; and the above-mentioned 90° corrugated corner plate of the marine liquid cargo tank, the corrugated corner plate is used to connect the tank bottom corrugated plate and the side wall corrugated plate.

[0060] In the present invention, the liquefied natural gas storage tank is used for assembly of ships. By adopting the above-mentioned corner corrugated plate, a single corner is decomposed into multiple small-angle turns to avoid stress concentration, provide a buffer space for structural deformation, and effectively disperse the external force encountered during the operation of the ship, thereby improving the performance of the overall storage tank, optimizing the connection structure design, improving system reliability, and extending service life.

[0061] 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.

[0062] 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. A 90° corrugated corner plate for a marine liquid cargo tank, applied to a natural gas storage tank, the natural gas storage tank comprising a tank bottom corrugated plate and a side wall corrugated plate, characterized in that: The corrugated corner plate comprises: A first connecting plate (1) used to connect the tank bottom corrugated plate, the first connecting plate (1) comprising two first plate bodies (11) and a first corrugated plate (12) connecting the two first plate bodies (11); A second connecting plate (2) used to connect the side wall corrugated plates, the second connecting plate (2) comprising two second plate bodies (21) and a second corrugated plate (22) connecting the two second plate bodies (21); A buffer plate (3), comprising two first buffer portions (31) and a second buffer portion (32) connecting the two first buffer portions (31), wherein two ends of the second buffer portion (32) are respectively connected to the first corrugated plate (12) and the second corrugated plate (22), one end of the two first buffer portions (31) are respectively connected to the two first plate bodies (11), and the other ends of the two first buffer portions (31) are respectively connected to the two second plate bodies (21); The second buffer portion (32) comprises a first connecting plate (321), a second connecting plate (322) and a third connecting plate (323); the first connecting plate (321) is connected to the first corrugated plate (12) and forms an angle a with the first corrugated plate (12); the second connecting plate (322) is connected to the second corrugated plate (22) and forms an angle b with the second corrugated plate (22); the third buffer portion connects the first connecting plate (321) and the second connecting plate (322); an angle c is formed between the third connecting plate (323) and the first connecting plate (321); and an angle d is formed between the third connecting plate (323) and the second connecting plate (322).

2. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 1, characterized in that: The angle a, the angle b, the angle c and the angle d are all acute angles.

3. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 2, characterized in that: The angle a is equal to the angle b, and the angle c is equal to the angle d.

4. The 90° corrugated corner plate of a marine liquid cargo tank according to any one of claims 1 to 3, characterized in that: There is a smooth transition between the first connecting plate (321) and the first corrugated plate (12), there is a smooth transition between the second connecting plate (322) and the second corrugated plate (22), and both ends of the third connecting plate (323) are smoothly transitioned to the first connecting plate (321) and the second connecting plate (322), respectively.

5. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 1, characterized in that: The plane where the first plate body (11) is located and the plane where the second plate body (21) is located define a central interface (4), and the first connecting plate (1) and the second connecting plate (2) are arranged in a mirror image with respect to the central interface (4).

6. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 5, characterized in that: The buffer plate (3) is arranged in a mirror image with respect to the central interface (4).

7. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 1 or 5, characterized in that: The extension direction of the first connecting plate (1) is perpendicular to the extension direction of the second connecting plate (2).

8. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 1 or 5, characterized in that: There is a smooth transition between the first buffer portion (31) and the first plate body (11), and there is a smooth transition between the first buffer portion (31) and the second plate body (21).

9. The 90° corrugated corner plate of a marine liquid cargo tank according to claim 1 or 5, characterized in that: The first corrugated plate (12) and the second corrugated plate (22) are both in the shape of a circular arch; the first corrugated plate (12) and the first plate body (11) are in smooth transition; the second corrugated plate (22) and the second plate body (21) are in smooth transition.

10. A liquefied natural gas storage tank, characterized in that: include: Tank bottom corrugated sheet and side wall corrugated sheet; And a 90° corrugated corner plate of a marine liquid cargo tank as described in any one of claims 1 to 9, wherein the corrugated corner plate is used to connect the tank bottom corrugated plate and the side wall corrugated plate.

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