Low temperature liquid cargo tank

Abstract

The application discloses a low-temperature liquid cargo storage tank and belongs to the technical field of low-temperature storage and transportation equipment. The tank wall is sequentially provided with a secondary insulation layer, a secondary shielding layer, a main insulation layer and a main shielding layer from outside to inside, wherein the main insulation layer is formed by splicing a plurality of rectangular main insulation boxes, corner spaces are formed by surrounding cut corners of corners of the adjacent four main insulation boxes, an anchoring device is arranged in the corner spaces, and the anchoring device is used for realizing fastening of the multilayer tank wall structure. The anchoring device comprises a bottom plate, a pressing plate, a fastener and a leveling piece, the leveling piece comprises four gaskets and an adjusting rod, the support height of the pressing plate at each position can be independently adjusted, the height difference caused by assembly errors of the main insulation boxes and unevenness of the tank wall surface can be compensated, and the uniform force of the pressing plate is ensured, or resin mortar is filled between the pressing plate and the main insulation box to realize self-adaptive leveling. The application solves the problem that the traditional anchoring pressing plate is prone to damage and failure due to eccentric loading, and improves the structural reliability and service life of the storage tank.

Description

Technical Field

[0001] This invention relates to the field of cryogenic storage and transportation equipment technology, and specifically to a cryogenic liquid cargo storage tank. Background Technology

[0002] Thin-film cryogenic liquid cargo storage tanks are core equipment for the storage and transportation of ultra-low temperature flammable and explosive liquids. The stability of the tank wall's insulation layer, shielding layer, and fixing structure directly determines the overall safety performance of the tank. Existing cryogenic liquid cargo storage tanks generally employ a multi-layered composite structure, with a secondary insulation layer, secondary shielding layer, primary insulation layer, and primary shielding layer arranged sequentially from the outside in. The primary shielding layer directly contacts the internal ultra-low temperature liquid cargo. The primary and secondary insulation layers are composed of multiple rectangular primary insulation boxes spliced ​​together, forming the core structure ensuring the tank's thermal insulation and pressure resistance.

[0003] In current technologies, after multiple main insulation boxes are spliced ​​together, multiple anchoring devices are installed in the space formed by their corners to achieve a tight connection between the secondary insulation layer, the secondary shielding layer, and the main insulation layer. However, the following defects exist in actual installation and use: Due to the flatness error of the outer wall of the storage tank and the prefabrication and assembly errors of the insulation boxes, a height difference is easily generated at the corner position after splicing four adjacent main insulation boxes. This leads to uneven installation and uneven stress on the anchoring device pressure plates in the corner space, which not only causes the pressure plates to deform and be damaged, but also causes the entire anchoring device to fail. The anchoring device has insufficient fixing stability. During long-term use, the main insulation box is susceptible to multiple effects from the internal liquid pressure of the storage tank, the impact of liquid sloshing, and the external environmental pressure of the storage tank, resulting in shaking, displacement, or even detachment. This directly leads to the failure of the main insulation layer's support for the internal membrane shielding structure of the storage tank, causing membrane damage and leakage of ultra-low temperature flammable and explosive liquids, which is a major safety accident. This seriously threatens the operational safety of cryogenic liquid storage tanks and cannot meet the requirements for long-term, stable, and safe storage of ultra-low temperature liquids.

[0004] Therefore, there is a need to provide a cryogenic liquid cargo storage tank to at least partially solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a cryogenic liquid cargo storage tank that solves the technical problems of uneven installation of anchor plates, uneven stress, and easy failure of anchoring devices caused by assembly errors of the main insulation box in existing storage tanks. This invention achieves precise leveling of the anchor plates and uniform stress, improves the structural stability and strength of the insulation box, eliminates the hidden dangers of anchor failure, insulation box detachment, membrane damage, and liquid leakage, and significantly improves the overall safety, stability, and service life of cryogenic liquid cargo storage tanks.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a cryogenic liquid cargo storage tank, wherein the tank wall comprises, from the outside to the inside, a secondary insulation layer, a secondary shielding layer, a primary insulation layer, and a primary shielding layer, wherein the primary shielding layer is in contact with the liquid cargo inside the tank; The main insulation layer includes several main insulation boxes, each main insulation box being rectangular in shape, consisting of an upper plywood, a polyurethane block, and a lower plywood from top to bottom; the upper plywood and polyurethane block at the four corners of the main insulation box are chamfered, and when four adjacent main insulation boxes are spliced ​​together, the four chamfers cooperate with each other and together enclose a corner space, and an anchoring device is provided in the corner space; The anchoring device is used to fasten the secondary insulation layer, the secondary shielding layer, and the main insulation layer together. The anchoring device includes a base plate, a pressure plate, a fastening assembly, and a leveling component. The base plate is fixedly installed on the secondary insulation layer. The fastening assembly includes a screw, a washer, and a nut. The pressure plate is arranged in the corner space and is mounted above the lower plywood at the four corner positions of the four adjacent main insulation boxes to press the four adjacent main insulation boxes. The screw is located on the base plate and penetrates the secondary shielding layer, extends into the corner space, and penetrates the pressure plate. The pressure plate is fastened by connecting the screw with a washer and a nut. The leveling component is disposed between the pressure plate and the lower plywood at the four corner positions of the four adjacent main insulation boxes. The leveling component includes four pads, each of which is disposed on the lower plywood at the four corner positions of the four adjacent main insulation boxes. Each pad is provided with an adjusting rod for leveling the installation height of the pressure plate. Each adjusting rod is disposed on the pad and passes through the pressure plate. After the installation height of the pressure plate is leveled, the pressure plate is fastened by connecting the adjusting rods with washers and nuts.

[0007] In some embodiments, the periphery of both the gasket and the nut is welded to the pressure plate, further enhancing the strength of the fastening connection and preventing the fastening components from loosening.

[0008] In some embodiments, a layer of reinforcing plywood is also provided at the four corners of the main insulation box. The reinforcing plywood is provided on the lower plywood at the four corners of the main insulation box. The thickness of the reinforcing plywood is greater than the thickness of the lower plywood. The two sides of the reinforcing plywood facing the polyurethane block of the main insulation box are bonded to the polyurethane block, which effectively disperses the force at the corners and avoids tearing of the edges of the polyurethane block.

[0009] In some embodiments, the main insulation box is integrally formed from the polyurethane block with chamfered corners, the upper plywood, the reinforcing plywood, and the lower plywood, thereby improving the overall structural integrity and strength of the insulation box.

[0010] In some embodiments, the reinforced plywood has a groove for installing the leveling component. The pad of the leveling component is disposed in the groove to achieve positioning and limiting of the pad, thereby improving installation stability and convenience.

[0011] In some embodiments, the lower plywood corner of the main insulation box is provided with a beveled corner, and the beveled corner has an inclined end face; The anchoring device further includes a first limiting member for limiting the displacement of the main insulation box; the first limiting member is fixedly connected to the screw on the base plate; the first limiting member is in the shape of a regular octahedron, and the four sides of the first limiting member are in contact with the inclined end faces of the lower plywood of the four adjacent main insulation boxes, which can effectively limit the rotational displacement of the insulation box.

[0012] In some embodiments, the first limiting member is disposed on the base plate or the secondary shielding layer; when the first limiting member is disposed on the secondary shielding layer, the first limiting member is welded to the periphery of the secondary shielding layer to ensure the sealing integrity of the secondary shielding layer.

[0013] In some embodiments, the anchoring device further includes a second limiting member for limiting the displacement of the main insulation box; the second limiting member is disposed in the gap formed between two adjacent main insulation boxes; the second limiting member is fixedly connected to the base plate or the pressure plate, and the multiple limiting further prevents the insulation box from shifting or shaking.

[0014] In some embodiments, the leveling component further includes resin putty, which is disposed between the pad of the leveling component and the lower plywood at the four corner positions of the four adjacent main insulation boxes, or between the pad of the leveling component and the pressure plate of the anchoring device. The flexible curing characteristics of the resin putty are used to further optimize the leveling effect and improve the uniformity of stress.

[0015] The present invention also provides a cryogenic liquid cargo storage tank, wherein the tank wall comprises, from the outside to the inside, a secondary insulation layer, a secondary shielding layer, a primary insulation layer, and a primary shielding layer, wherein the primary shielding layer is in contact with the liquid cargo inside the tank; The main insulation layer includes several main insulation boxes, each main insulation box being rectangular in shape, consisting of an upper plywood, a polyurethane block, and a lower plywood from top to bottom; the upper plywood and polyurethane block at the four corners of the main insulation box are chamfered, and when four adjacent main insulation boxes are spliced ​​together, the four chamfers cooperate with each other and together enclose a corner space, and an anchoring device is provided in the corner space; The anchoring device is used to fasten the secondary insulation layer, the secondary shielding layer, and the main insulation layer together. The anchoring device includes a base plate, a pressure plate, fastening components, and resin putty. The base plate is fixedly installed on the secondary insulation layer. The fastening components include a screw, a washer, and a nut. The pressure plate is arranged in the corner space and is erected above the lower plywood at the four corner positions of the four adjacent main insulation boxes to press the four adjacent main insulation boxes. The screw is located on the base plate and penetrates the secondary shielding layer, extends into the corner space, and penetrates the pressure plate. The pressure plate is fastened by connecting the screw with a washer and a nut. The resin putty is used to level the installation height of the pressure plate. The resin putty is placed between the lower plywood at the four corner positions of the four adjacent main insulation boxes and the pressure plate of the anchoring device. The pressure plate is accurately leveled by the resin putty curing and filling, which simplifies the structure and reduces costs.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention adds a dedicated leveling structure to the anchoring device, employing two methods: leveling with a pad and adjusting rod, and flexible leveling with resin putty. This effectively offsets the corner height difference caused by installation errors of the main insulation box and unevenness of the outer wall of the storage tank, achieving precise leveling of the pressure plate and ensuring uniform stress on the pressure plate. This solves the problems of deformation and damage caused by pressure plate tilting and uneven stress in traditional structures, as well as anchoring device failure, significantly improving the stability and service life of the anchoring system.

[0017] 2. This invention features a thickened reinforced plywood at the corner of the main insulation box, which is then bonded and fixed to a polyurethane block. This significantly improves the structural strength of the corner of the insulation box and disperses the pressure of the pressure plate. Due to the increased contact area with the polyurethane block, cracking and tearing at the bonding edge between the polyurethane block and the plywood are effectively avoided, ensuring the structural integrity and fatigue resistance of the main insulation box and solving the problem of structural damage under long-term pressure and impact. At the same time, grooves are cut into the reinforced plywood to enable the positioning and installation of the leveling pad, preventing the pad from shifting or shaking, and improving assembly accuracy and structural stability.

[0018] 3. The present invention sets up a multi-limiting structure with a regular octahedral first limiting member and a gap-type second limiting member, which can effectively limit the rotation, offset and displacement of the main insulation box, and prevent the insulation box from shaking and falling off under the action of liquid pressure, sloshing impact and external pressure. It ensures the stable support of the main insulation layer for the inner membrane of the storage tank, and avoids major safety hazards such as membrane damage and leakage of ultra-low temperature flammable and explosive liquid from the root.

[0019] 4. This invention provides two leveling and anchoring schemes to adapt to different installation conditions and precision requirements. The structure is reasonably designed, easy to assemble, and highly reliable, which greatly reduces the equipment failure rate and maintenance costs. It significantly improves the safety, stability, and durability of cryogenic liquid cargo storage tanks and is suitable for the long-term storage and use of flammable and explosive liquid cargo at -160℃. Attached Figure Description

[0020] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the preferred embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0021] Figure 1 This is a schematic diagram of the assembly of four main insulation boxes according to a preferred embodiment of the present invention, showing the corner space formed after the four adjacent insulation boxes are spliced ​​together and the anchoring device installed in the corner space; Figure 2 This is a schematic diagram of the assembly of two main insulation boxes according to a preferred embodiment of the present invention, showing the anchoring device installed at the corner of the insulation box; Figure 3 This is an enlarged schematic diagram of the anchoring device according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the anchoring device according to a preferred embodiment of the present invention, showing the leveling component and the first limiting component; Figure 5 This is a schematic diagram of the anchoring device in a preferred embodiment of the present invention, showing the main insulation box reinforced with plywood; Figure 6 This is a schematic diagram of the anchoring device in a preferred embodiment of the present invention, showing the groove on the reinforced plywood.

[0022] Explanation of reference numerals in the attached figures: 1. Main insulation box; 11. Install plywood; 12. Polyurethane blocks; 13. Lower plywood; 131. Oblique cut angle; 132. Inclined end face; 14. Chamfering; 15. Corner space; 16. Reinforced plywood; 17. Groove; 2. Anchoring device; 21. Base plate; 22. Pressure plate; 23. Fastening components; 231. Screw; 232. Gasket; 233. Nut; 24. Leveling components; 241. Pad; 242. Adjusting rod; 3. First limiting component. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., used in the specification and claims of this invention application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. In this invention application, unless otherwise stated, directional terms such as "inner" and "outer" generally refer to the inner and outer contours of the corresponding structures.

[0025] It should be noted that the cryogenic liquid cargo storage tanks of the embodiments of this invention are particularly suitable for storing cryogenic liquid cargoes such as liquefied natural gas, liquefied ethylene gas, and liquefied petroleum gas in ships or onshore facilities. For ease of understanding, in the embodiments of this invention, with reference to the inside and outside directions of the cryogenic liquid cargo storage tank, the direction toward the internal storage space of the tank (i.e., the space for storing cryogenic liquid cargo) is defined as "inner side", the direction away from the storage space is defined as "outer side", and the height direction of the main insulation layer (i.e., the extension direction from the inner side to the outer side) is defined as "thickness direction".

[0026] This invention discloses a cryogenic liquid cargo storage tank suitable for storing ultra-low temperature flammable and explosive liquids, such as liquefied natural gas, at -160℃. The tank wall, from the outside in, is sequentially arranged with a secondary insulation layer, a secondary shielding layer, a primary insulation layer, and a primary shielding layer. The primary shielding layer is in direct contact with the liquid cargo inside the tank. The primary insulation layer is assembled from several primary insulation boxes 1, with anchoring devices 2 installed at the corners of adjacent primary insulation boxes 1 to achieve interlayer fastening. This invention includes two independently implementable technical solutions: an anchoring structure embodiment with mechanical leveling components and a simplified anchoring structure embodiment using only resin putty for leveling.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, the main insulation layer includes several main insulation boxes 1, and the main insulation box 1 has an overall rectangular structure. Figure 3 and Figure 4 As shown, the main insulation box 1 consists of an upper plywood 11, a polyurethane block 12, and a lower plywood 13 from top to bottom. The upper plywood 11 and polyurethane block 12 at the four corners of the main insulation box 1 are chamfered at corners 14. When four adjacent main insulation boxes 1 are spliced ​​together, the four chamfered corners 14 enclose each other to form corner spaces 15, and anchoring devices 2 are arranged inside the corner spaces 15. The function of the anchoring devices 2 is to securely connect the secondary insulation layer, the secondary shielding layer, and the main insulation layer into a single unit.

[0029] like Figure 3 and Figure 4 As shown, the anchoring device 2 includes a base plate 21, a pressure plate 22, a fastening assembly 23, and a leveling component 24. The base plate 21 is fixedly installed on the secondary insulation layer. The fastening assembly 23 includes a screw 231, a washer 232, and a nut 233. The pressure plate 22 is arranged in the corner space 15 and is mounted above the lower plywood 13 at the corner positions of four adjacent main insulation boxes 1, simultaneously pressing the four main insulation boxes 1. The screw 231 is fixedly installed on the base plate 21, extends upward through the secondary shielding layer into the corner space 15, and passes through the pressure plate 22. The pressure plate 22 is fixed by locking it with the washer 232 and the nut 233.

[0030] The leveling component 24 is installed between the pressure plate 22 and the lower plywood 13 at the corners of the four adjacent main insulation boxes 1. The leveling component 24 includes four pads 241, which are placed one-to-one on the lower plywood 13 at the corners of the four main insulation boxes 1. Each pad 241 is equipped with an adjusting rod 242, which extends upward through the pressure plate 22. During on-site installation, the extension height of the four adjusting rods 242 is adjusted according to the assembly height difference of the four main insulation boxes 1 to achieve horizontal leveling of the pressure plate 22. After the pressure plate 22 is leveled, the adjusting rods 242 are locked with matching shims 232 and nuts 233 to keep the pressure plate 22 horizontal and evenly compressed.

[0031] Furthermore, the outer periphery of both the gasket 232 and the nut 233 is welded to the pressure plate 22. Welding prevents the nut from loosening under long-term vibration and low-temperature alternating conditions, ensuring the reliability of the anchoring connection.

[0032] like Figure 5As shown, reinforced plywood 16 is installed at the four corners of the main insulation box 1. The reinforced plywood 16 is fixed to the lower plywood 13, and the thickness of the reinforced plywood 16 is greater than that of the lower plywood 13. The two sides of the reinforced plywood 16 facing the polyurethane block 12 are bonded and fixed to the polyurethane block 12. The pad plate 241 is supported above the reinforced plywood 16. The pressure on the pressure plate 22 is transmitted to the reinforced plywood 16 through the leveling component 24. The reinforced plywood 16 increases the bonding and stress-bearing area with the polyurethane block 12, avoiding stress concentration and tearing at the corner edges of the polyurethane block 12, and improving the structural strength and fatigue resistance at the corners of the main insulation box 1.

[0033] Preferably, the main insulation box 1 is manufactured using an integral molding process: the polyurethane block 12 with chamfered corners 14 is integrally molded with the upper plywood 11, the reinforcing plywood 16, and the lower plywood 13. The reinforcing plywood 16 serves as a reinforcement part in the corner area of ​​the lower plywood 13, eliminating the need for separate post-assembly bonding, resulting in a stronger overall structure.

[0034] like Figure 6 As shown, a groove 17 is provided on the reinforced plywood 16, and the pad 241 of the leveling component 24 is placed inside the groove 17. The groove 17 serves to limit and position the pad 241, making it easy to align during installation, while also preventing the pad 241 from sliding horizontally and improving the stability of the leveling structure.

[0035] like Figure 4 As shown, the lower plywood 13 of the main insulation box 1 has a beveled corner 131 at its corner, forming an inclined end face 132. The anchoring device 2 is also equipped with a first limiting member 3 to restrict the displacement and rotation of the main insulation box 1. The first limiting member 3 is installed on the screw 231 of the base plate 21. The first limiting member 3 is octahedral in shape, with its four sides respectively abutting against the inclined end faces 132 of the lower plywood 13 of the four adjacent main insulation boxes 1. When the four main insulation boxes 1 are subjected to liquid impact or external load and have a tendency to rotate, the inclined end faces 132 abut against the sides of the first limiting member 3, restraining the rotation and displacement of the main insulation box 1.

[0036] The first limiting member 3 has two installation methods: the first is to install it on the base plate 21, and the second is to install it on the secondary shielding layer. When the first limiting member 3 is set on the secondary shielding layer, the outer periphery of the first limiting member 3 is fully welded to the secondary shielding layer to ensure the sealing continuity of the secondary shielding layer and prevent the penetration of low temperature medium.

[0037] In another embodiment (not shown in the accompanying drawings), the anchoring device 2 is further provided with a second limiting member, which is arranged in the gap between two adjacent main insulation boxes 1. The second limiting member can be fixedly connected to the base plate 21 or the pressure plate 22. The second limiting member, together with the first limiting member 3, forms a multi-directional limiting structure, further restricting the horizontal movement and misalignment of the main insulation boxes 1.

[0038] The leveling component 24 can also be fitted with resin putty. The resin putty is filled between the pad 241 and the lower plywood 13, or between the pad 241 and the pressure plate 22. After the adjusting rod 242 completes the height leveling, the resin putty gradually cures. The resin putty has a certain degree of flexibility, which can further compensate for minor installation errors, disperse contact stress, and buffer vibration and impact during operation.

[0039] During the on-site assembly of membrane-type cryogenic liquid cargo storage tanks, height differences are commonly observed at the corners of the four adjacent main insulation boxes 1 due to factors such as the flatness of the tank's outer wall, prefabrication tolerances of the main insulation boxes, and construction and installation errors. If the pressure plate 22 is laid directly, its tilt and uneven stress can easily lead to localized overload damage and anchoring failure. This solution utilizes four independent adjusting rods 242 to adjust the height of the four support points, ensuring the pressure plate 22 remains horizontal and applies even pressure to the four main insulation boxes 1. Simultaneously, reinforced plywood 16 strengthens the corner structure, and the first and second limiting components restrict the displacement and swaying of the insulation boxes, stabilizing the main shielding layer and preventing membrane damage and cryogenic liquid cargo leakage.

[0040] Example 2

[0041] This embodiment is largely the same as the first embodiment in terms of structure, and the similarities will not be described again. The difference is that the mechanical leveling component 24, the pad 241 and the adjusting rod 242 are removed, and the pressure plate 22 is leveled separately using resin putty.

[0042] This embodiment provides a cryogenic liquid cargo storage tank. The tank wall, from the outside to the inside, includes: a secondary insulation layer, a secondary shielding layer, a main insulation layer, and a main shielding layer. The main shielding layer is in contact with the liquid cargo inside the tank. The main insulation layer is composed of several main insulation boxes 1 spliced ​​together. The main insulation box 1 consists of an upper plywood 11, a polyurethane block 12, and a lower plywood 13 from top to bottom. A chamfer 14 is provided at the corner of the main insulation box 1. Four adjacent main insulation boxes 1 enclose a corner space 15, and an anchoring device 2 is arranged in the corner space 15.

[0043] The anchoring device 2 includes a base plate 21, a pressure plate 22, a fastening assembly 23, and resin putty. The fastening assembly 23 includes a screw 231, a washer 232, and a nut 233. The base plate 21 is fixed to the secondary insulation layer. The screw 231 extends upward from the base plate 21 through the secondary shielding layer, into the corner space 15, and passes through the pressure plate 22. The pressure plate 22 is locked in place by the washer 232 and the nut 233.

[0044] Resin putty is filled between the lower plywood 13 and the pressure plate 22 at the corners of four adjacent main insulation boxes 1. During assembly, resin putty is applied above the lower plywood 13, and the pressure plate 22 is placed down. The resin putty adapts to compensate for the height difference at the four locations based on its flow characteristics. After the resin putty has fully cured, it forms a continuous support surface, so that the pressure plate 22 is evenly stressed.

[0045] This embodiment eliminates the need for mechanical leveling components, resulting in a simpler structure, fewer parts, and reduced processing and assembly costs. It is suitable for engineering projects with relatively small installation errors and strict cost control.

[0046] During operation, the storage tank carries cryogenic liquid cargo. The flow and sloshing of the liquid cargo continuously exert alternating impact loads on the main insulation layer, while the tank is also subjected to environmental pressure. This invention eliminates the height difference in the assembly of the insulation box through a leveling structure, ensuring uniform stress on the anchoring device pressure plate and preventing damage to the pressure plate due to uneven load and anchoring failure. Furthermore, this invention uses multiple limiting structures to prevent the main insulation box from shaking, shifting, or falling off, and the corner reinforcement structure protects the polyurethane block from tearing, maintaining the structural integrity of the main insulation layer for a long time and continuously providing stable support for the main shielding film. This addresses the significant safety risks of film damage and leakage of flammable and explosive cryogenic liquid cargo from the source, significantly improving the operational safety and service life of membrane-type cryogenic liquid cargo storage tanks.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0048] The orientation or spatial relationships involved in this invention application, such as "top," "bottom," "inner," "outer," "vertical," "lateral," and "longitudinal," are all defined based on the perspective shown in the accompanying drawings. These expressions are intended only to simplify the description of the technical solutions of this invention application, and do not imply or indicate that the referred elements must be in a specific orientation, or constructed and operated in a specific order. Therefore, the orientation terms mentioned herein should not be regarded as absolute limitations on the claims.

[0049] In the description of this invention application, terms such as "installation," "connection," "arrangement," and "setting" should be interpreted broadly. Specifically, a connection can be a fixed connection, a detachable connection, or even a structurally integral molding; it can refer to physical mechanical contact or the connection of pipelines; furthermore, a connection includes both direct connection and indirect connection achieved through intermediate components (such as valves or flanges). Those skilled in the art can determine the precise meaning of the above terms in this invention application based on the specific context and technical logic.

[0050] It should be clarified that the foregoing embodiments are merely representative examples of this invention and do not constitute an exclusive definition of the scope of protection of this invention. For those skilled in the art, any conventional changes such as local optimizations, functional equivalent substitutions, or detailed modifications made without departing from the core concept of this invention should be included within the scope of the claims of this invention.

[0051] The above description of various embodiments of this invention is provided for descriptive purposes to a person skilled in the art. It is not intended to limit this invention to a single disclosed embodiment. As taught above, those skilled in the art will understand various alternatives and variations of the invention. Therefore, although some alternative embodiments have been specifically described, those skilled in the art will understand or relatively easily develop other embodiments. This invention is intended to include all alternatives, modifications, and variations of the invention described herein, as well as other embodiments falling within the spirit and scope of the invention described above.

Claims

1. A cryogenic liquid cargo storage tank, characterized in that, The tank wall comprises, from the outside to the inside, a secondary insulation layer, a secondary shielding layer, a primary insulation layer, and a primary shielding layer, wherein the primary shielding layer is in contact with the liquid inside the tank. The main insulation layer includes several main insulation boxes (1). The main insulation box (1) is rectangular in shape and consists of an upper plywood (11), a polyurethane block (12), and a lower plywood (13) from top to bottom. The upper plywood (11) and the polyurethane block (12) at the four corners of the main insulation box (1) are provided with chamfers (14). When four adjacent main insulation boxes (1) are spliced ​​together, the four chamfers (14) cooperate with each other and enclose each other to form a corner space (15). An anchoring device (2) is provided in the corner space (15). The anchoring device (2) is used to fasten the secondary insulation layer, the secondary shielding layer and the main insulation layer together; the anchoring device (2) includes a base plate (21), a pressure plate (22), a fastening assembly (23) and a leveling component (24), the base plate (21) is fixedly installed on the secondary insulation layer, and the fastening assembly (23) includes a screw (231), a washer (232) and a nut (233); the pressure plate (22) is arranged in the corner space (1 5) and above the lower plywood (13) at the four corner positions of the four adjacent main insulation boxes (1), used to press the four adjacent main insulation boxes; the screw (231) is provided on the base plate (21) and penetrates the secondary shielding layer, extends into the corner space (15), and penetrates the pressure plate (22), and the pressure plate (22) is fastened by connecting the screw (231) with the gasket (232) and nut (233); The leveling component (24) is disposed between the pressure plate (22) and the lower plywood (13) at the four corner positions of the four adjacent main insulation boxes (1). The leveling component (24) includes four pads (241). Each pad (241) is disposed on the lower plywood (13) at the four corner positions of the four adjacent main insulation boxes. Each pad (241) is provided with an adjusting rod (242) for leveling the installation height of the pressure plate (22). Each adjusting rod (242) is disposed on each pad (241) and passes through the pressure plate (22). After the installation height of the pressure plate (22) is leveled, the adjusting rods (242) are connected by shims (232) and nuts (233) to fasten the pressure plate (22).

2. The cryogenic liquid cargo storage tank according to claim 1, characterized in that, The circumferences of the gasket (232) and the nut (233) are both welded to the pressure plate.

3. The cryogenic liquid cargo storage tank according to claim 1, characterized in that, The main insulation box (1) is provided with a layer of reinforcing plywood (16) at the four corners. The reinforcing plywood (16) is provided on the lower plywood (13) at the four corners of the main insulation box (1). The thickness of the reinforcing plywood (16) is greater than the thickness of the lower plywood (13). The two sides of the reinforcing plywood (16) facing the polyurethane block (12) of the main insulation box (1) are bonded to the polyurethane block (12).

4. The cryogenic liquid cargo storage tank according to claim 3, characterized in that, The main insulation box (1) is integrally formed from the polyurethane block (12) with chamfered corners, the upper plywood (11), the reinforcing plywood (16) and the lower plywood (13).

5. The cryogenic liquid cargo storage tank according to claim 3, characterized in that, The reinforced plywood (16) has a groove (17) for installing the leveling component (24), and the pad (241) of the leveling component (24) is located in the groove (17).

6. The cryogenic liquid cargo storage tank according to claim 1, characterized in that, The corner of the lower plywood (13) of the main insulation box (1) is provided with a beveled corner (131), and the beveled corner has an inclined end face (132). The anchoring device (2) further includes a first limiting member (3) for limiting the displacement of the main insulation box (1); the first limiting member (3) is fixedly connected to the screw (231) on the base plate (21); the first limiting member (3) is in the shape of a regular octahedron, and the four sides of the first limiting member (3) are in contact with the inclined end face (132) of the lower plywood of the four adjacent main insulation boxes (1).

7. The cryogenic liquid cargo storage tank according to claim 6, characterized in that, The first limiting member (3) is disposed on the base plate (21) or the secondary shielding layer; when the first limiting member (3) is disposed on the secondary shielding layer, the first limiting member (3) is welded to the periphery of the secondary shielding layer.

8. The cryogenic liquid cargo storage tank according to claim 1, characterized in that, The anchoring device (2) further includes a second limiting member for limiting the displacement of the main insulation box (1); the second limiting member is disposed in the gap formed between two adjacent main insulation boxes (1); the second limiting member is fixedly connected to the base plate (21) or the pressure plate (22).

9. The cryogenic liquid cargo storage tank according to any one of claims 1-8, characterized in that, The leveling component (24) also includes resin putty, which is disposed between the pad (241) of the leveling component (24) and the lower plywood (13) at the four corner positions of the four adjacent main insulation boxes (1), or between the pad (241) of the leveling component (24) and the pressure plate (22) of the anchoring device (2).

10. A cryogenic liquid cargo storage tank, characterized in that, The tank wall comprises, from the outside to the inside, a secondary insulation layer, a secondary shielding layer, a primary insulation layer, and a primary shielding layer, wherein the primary shielding layer is in contact with the liquid inside the tank. The main insulation layer includes several main insulation boxes (1). The main insulation box (1) is rectangular in shape and consists of an upper plywood (11), a polyurethane block (12), and a lower plywood (13) from top to bottom. The upper plywood (11) and the polyurethane block (12) at the four corners of the main insulation box (1) are provided with chamfers (14). When four adjacent main insulation boxes (1) are spliced ​​together, the four chamfers (14) cooperate with each other and enclose each other to form a corner space (15). An anchoring device (2) is provided in the corner space (15). The anchoring device (2) is used to fasten the secondary insulation layer, the secondary shielding layer and the main insulation layer together; the anchoring device (2) includes a base plate (21), a pressure plate (22), a fastening assembly (23) and resin putty. The base plate (21) is fixedly installed on the secondary insulation layer. The fastening assembly (23) includes a screw (231), a washer (232) and a nut (233). The pressure plate (22) is arranged in the corner space (15) and is erected above the lower plywood (13) at the four corner positions of the four adjacent main insulation boxes (1) to press the four adjacent main insulation boxes. The screw (231) is provided on the base plate (21) and penetrates the secondary shielding layer, extends into the corner space (15) and penetrates the pressure plate (22). The pressure plate (22) is fastened by connecting the screw (231) with the washer (232) and the nut (233). The resin putty is used to level the installation height of the pressure plate (22). The resin putty is placed between the lower plywood (13) at the four corner positions of the four adjacent main insulation boxes (1) and the pressure plate (22) of the anchoring device (2).

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