Liquefied gas storage device and assembly method thereof

Abstract

The present application discloses a liquefied gas storage device and an assembly method thereof, relating to the field of liquefied gas storage. The device comprises a support structure and a storage tank fixed to the support structure. The storage tank comprises a tank body and a top cover. A first thermal insulation layer, a secondary film, a second thermal insulation layer, and a primary film are sequentially laid in the tank body. A first fastening lug is provided on the inner wall of the tank body. First welding strips are provided on both sides of the first fastening lug. A second fastening lug connected to the secondary film is provided on the first fastening lug. A plurality of positioning seats are provided on the bottom side of the first fastening lug. A plurality of positioning blocks that plug into and mate with the plurality of positioning seats are provided on the second fastening lug. The positioning seat is provided on the side of the second fastening lug close to the tank body. A second welding strip connected to the first fastening lug is provided on the side of the second fastening lug away from the tank body. The present application improves the convenience of fixing and assembling the second fastening lug with the first fastening lug and ensures the stability of the second fastening lug and the first fastening lug.

Description

Technical Field

[0001] The present application relates to the field of liquefied gas storage, and in particular to a liquefied gas storage device and an assembly method thereof. Background Art

[0002] Currently, LNG storage tanks are specialized products and equipment for storing LNG. Membrane tanks are one type of these tanks, offering advantages such as high space utilization, relatively light weight, and faster construction.

[0003] In the prior art, patent No. 202180078149.X relates to a membrane tank. The patent name is Liquid Dome for Storage Tank of Liquefied Gas, which includes a bearing structure and a sealed and insulated liquid tank arranged in the bearing structure. The bearing structure has an upper bearing wall, a sealing film, an insulating barrier of the main structure, and the upper bearing wall is locally interrupted to define a pipeline. The pipeline and the upper cover wall are made of different iron-based alloys, and at least one first fastening lug extending from the upper cover wall is sealingly fastened to the primary sealing film, and at least one second fastening lug extending from the upper cover wall is sealingly fastened to the secondary membrane connection.

[0004] With respect to the above-mentioned prior art, the first fastening lug and the second fastening lug are respectively fixed to the upper cover wall, the distance between the first fastening lug and the second fastening lug is small, and the distance between the second fastening lug and the inner wall of the pipe is small. During assembly, the second fastening lug and the first fastening lug need to be installed in sequence. Since the welding position space between the second fastening lug close to the outside of the tank body and the first fastening lug close to the outside of the tank body is small, there is a problem of difficulty in welding and fixing. Summary of the Invention

[0005] In order to improve the convenience of fixing and assembling the second fastening lug and the first fastening lug and ensure the stability of using the second fastening lug and the first fastening lug, the present application provides a liquefied gas storage device and an assembly method thereof.

[0006] The present application provides a liquefied gas storage device and an assembly method thereof using the following technical solutions:

[0007] It comprises a support structure and a storage tank fixed on the support structure; the storage tank comprises a tank body and a top cover, a first thermal insulation layer, a secondary film, a second thermal insulation layer and a primary film are sequentially laid in the tank body, a first fastening lug connected to the primary film is provided on the inner wall of the tank body, first welding strips connected to the tank body are provided on both sides of the first fastening lug, a second fastening lug connected to the secondary film is provided on the first fastening lug, a plurality of positioning seats are provided on the bottom side of the first fastening lug, a plurality of positioning blocks which are plugged into and cooperate with the plurality of positioning seats are provided on the second fastening lug, the positioning seat is provided on the side of the second fastening lug close to the tank body, and a second welding strip connected to the first fastening lug is provided on the side of the second fastening lug away from the tank body.

[0008] By adopting the above technical solution, during assembly, the first fastening lug is fixed to the inner wall of the tank body, and then the second fastening lug is fixed to the first fastening lug, and then the first thermal insulation layer, secondary film, second thermal insulation layer and primary film are installed in sequence. The first fastening lug is limited by the first welding strip on both sides, and the first fastening lug can be conveniently welded. One side of the second fastening lug is plugged into and matched with the positioning seat by the positioning block, and the other side is fixed by the second welding strip, so that the side with smaller space of the second fastening lug is locked with the positioning seat by the positioning block, thereby reducing the difficulty of welding and fixing the second fastening lug. By adopting such a design, the convenience of assembling the second fastening lug and the first fastening lug can be improved, and the stability of using the second fastening lug and the first fastening lug can be ensured; the first fastening lug and the second fastening lug are installed on the side wall of the tank body, and the first fastening lug and the second fastening lug can be more conveniently fixed when the cover plate is not installed, thereby improving the convenience of assembling the top cover.

[0009] Preferably, the second fastening lug is provided with a plurality of positioning holes which are plugged into and cooperate with the plurality of positioning blocks. The positioning blocks are inserted into the positioning seats through the positioning holes. The second welding strip is close to the side of the second fastening lug for closing the positioning holes.

[0010] By adopting the above technical solution, during assembly, the second fastening lug is first installed and positioned, and then the positioning block is inserted through the positioning socket, so that the positioning block is inserted into the positioning seat, so that the second fastening lug can be stably fixed first, and then the second welding strip is produced by welding to seal the positioning socket, thereby improving the convenience of welding the second fastening lug.

[0011] Preferably, a locking plug is provided on the side of the positioning seat close to the second fastening lug, a locking slot is provided on the side of the second fastening lug close to the positioning seat and is plugged into and cooperated with the locking plug, the locking slot is opened through the positioning socket, a locking card block is provided on the side of the locking plug away from the positioning block, and a locking slot is provided on the side of the locking slot away from the positioning block and is plugged into and cooperated with the locking card block.

[0012] By adopting the above technical solution, during assembly, the locking plug is first inserted into the locking slot, and the locking card block is clamped into the locking slot, and then the positioning block is inserted into the positioning seat, so that the second fastening lug can be fixed. With such a design, the second fastening lug can be fixed more firmly; when the second fastening lug is subjected to pressure, the locking card block cooperates with the locking slot, so that the positioning seat and the second fastening lug can be tightened more stably, and the positioning block can press the locking plug to improve the stability of the positioning of the second fastening lug.

[0013] Preferably, a positioning bolt is provided on the inner wall of the second fastening lug, the positioning bolt is inserted into the second thermal insulation layer, a locking cap for fixing the second thermal insulation layer is provided on the positioning bolt, a spacing cavity is provided between the second fastening lug and the tank body, an injection hole connected to the spacing cavity is provided on the positioning bolt, and the spacing cavity is provided with expansion foam injected by the injection hole to form a foam block.

[0014] By adopting the above technical solution, using a positioning bolt in conjunction with a locking cap, the second thermal insulation layer is less likely to wobble between the first and second fastening lugs, allowing for more stable fixation. Since the cavity between the second fastening lug and the tank body is relatively small, it is difficult for the first thermal insulation layer to be pressed into the cavity. Injecting expandable foam through the injection port allows the cavity to be fully filled, forming a foam block after cooling that not only supports the second fastening lug but also provides thermal insulation. Furthermore, the filling foam fills the gap, ensuring the preservation of liquefied gas.

[0015] Preferably, a plurality of connecting rods are provided on the side of the primary film close to the second insulation layer, the connecting rods are plugged into the injection hole, a plurality of annular grooves are opened on the outer wall of the connecting rod, and a fixed glue layer is filled between the outer wall of the connecting rod and the inner wall of the injection hole.

[0016] By adopting the above technical solution, when installing the second thermal insulation layer, the second thermal insulation layer can be fixed by plugging and matching the connecting rod with the injection hole. Combined with the fixing glue layer and the annular groove, the second thermal insulation layer can be fixed more stably and firmly, thereby improving the stability of the second thermal insulation layer.

[0017] Preferably, a sealing groove is provided on the upper side of the first fastening lug, and a sealing ring hook is provided at the bottom of the top cover. The sealing ring hook is plugged into the sealing groove to seal the connection between the top cover and the tank body, and sealant is provided in the sealing groove.

[0018] By adopting the above technical solution, when the top cover is installed, the sealing ring hook is inserted into the sealing groove, and the sealant is used to better seal the connection between the top cover and the tank body, thereby reducing the temperature of the liquefied gas in the storage equipment from leaking at the gap and ensuring the thermal insulation effect of the storage equipment.

[0019] Preferably, a plug-in ring is provided on one side of the primary film close to the top cover, a plug-in groove for plugging with the plug-in ring is provided at the bottom of the top cover, and a glue injection ring cavity is formed between the outer wall of the plug-in ring and the plug-in groove.

[0020] By adopting the above technical solution, a glue injection ring cavity is formed in the plug-in groove, which allows the plug-in ring strip to be inserted into the plug-in groove more conveniently, thereby improving the convenience of top cover installation. When the sealing ring hook is inserted into the sealing groove, the sealant can be pressed out of the sealing groove, and a certain amount of sealant can be discharged, so that the sealant can be pressed into the glue injection ring cavity, thereby better achieving the purpose of sealing the top cover. By adopting such a design, the overall sealing of the storage device can be improved, ensuring the storage effect of liquefied gas in the storage device.

[0021] Preferably, a limiting flow groove is opened at the opening on one side of the injection hole away from the locking cap, and the inner diameter of the limiting flow groove gradually increases in the direction away from the locking cap. A limiting position net is set at one end of the limiting flow groove away from the locking cap, and a limiting flow ball is set in the limiting flow groove, and the limiting flow ball is used to seal the injection hole.

[0022] By adopting the above technical solution, when in use, after the foam is injected, the expansion of the expansion foam in the spacer cavity will push the flow limiting ball against the injection hole, which can achieve the purpose of closing the injection hole, better ensure the sealing of both sides of the second fastening lug, reduce the expansion foam injected into the injection hole, and enable the connecting rod to be inserted more conveniently and stably, thereby improving the thermal insulation effect of the storage equipment.

[0023] Preferably, the outer wall of the flow-limiting ball is covered with a sealing layer, and the limiting net is provided with a compression piece for pushing the flow-limiting ball to abut against the injection hole.

[0024] By adopting the above technical solution, the compression piece can be used to make the flow-limiting ball press against the injection hole. In combination with the sealing layer, the injection hole can be sealed more stably, thereby improving the sealing effect of the injection hole.

[0025] A method for assembling liquefied gas storage equipment includes the following specific steps.

[0026] Step 1: Weld the fastening lugs, fix the first fastening lug to the side wall of the tank, and then fix the second fastening lug to the first fastening lug.

[0027] 1. Fix the upper and lower sides of the first fastening lug by welding to form a first welding strip;

[0028] 2. Install the second fastening lug on the bottom of the first fastening lug, then insert the positioning block through the positioning hole and connect it to the positioning seat. Finally, weld and form a second welding strip on the inner side of the second fastening lug, and close the positioning hole with the second welding strip.

[0029] Step 2: Install the structure, lay the first insulation layer, the secondary film, the second insulation layer and the primary film in sequence, weld the end of the secondary film to the second fastening lug, and weld the end of the primary film to the first fastening lug;

[0030] Step 3: Install the top cover. Install the top cover on the top of the tank body, insert the sealing ring hook into the sealing groove, and use the sealant to achieve the sealing of the top cover.

[0031] By adopting the above technical solution, when the second fastening lug is fixed, it can be fixed first by the positioning block, and then locked by the second welding strip, and the positioning hole is closed at the same time to achieve the effect of isolation and sealing, thereby improving the sealing effect of the tank body.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. During assembly, the first fastening lug is fixed to the inner wall of the tank, and the second fastening lug is fixed to the first fastening lug, and then the first thermal insulation layer, the secondary film, the second thermal insulation layer and the primary film are installed in sequence. The two sides of the first fastening lug are limited by the first welding strip, and the two sides of the first fastening lug can be easily welded to ensure the firmness of the first fastening lug. One side of the second fastening lug is plugged into and matched with the positioning seat by the positioning block, and the other side is fixed by the second welding strip, so that the second fastening lug is close to the outer wall of the tank body and locked with the positioning seat by the positioning block, thereby reducing the difficulty of welding and fixing the second fastening lug. Such a design can improve the convenience of assembling the second fastening lug and the first fastening lug, and can also ensure the stability of using the second fastening lug and the first fastening lug; the first fastening lug and the second fastening lug are installed on the side wall of the tank body, so that the first fastening lug and the second fastening lug can be more conveniently fixed when the cover plate is not installed, thereby improving the convenience of assembling the top cover;

[0034] 2. By adopting the above technical solution, during assembly, the second fastening lug is first installed and positioned, and then the positioning block is inserted through the positioning hole, so that the positioning block is inserted into the positioning seat. This can first stabilize the second fastening lug and then produce a second welding strip by welding to seal the positioning hole, thereby improving the convenience of welding the second fastening lug;

[0035] 3. By inserting the locking plug into the locking slot, and at the same time clamping the locking card block into the locking slot, and then inserting the positioning block into the positioning seat, the second fastening lug can be fixed. With this design, the second fastening lug can be fixed more firmly; when the second fastening lug is subjected to pressure, the locking card block cooperates with the locking slot, so that the positioning seat and the second fastening lug can be tightened more stably, and the positioning block can press the locking plug to improve the stability of the positioning of the second fastening lug. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A partial cross-sectional view of a liquefied gas storage device and an assembly method thereof according to Example 1 of the present application;

[0037] Figure 2 for Figure 1 A magnified schematic diagram of part A;

[0038] Figure 3 for Figure 1 An enlarged schematic diagram of part B;

[0039] Figure 4 This is a schematic diagram of the current limiting groove structure mainly embodied in Example 2 of the present application;

[0040] Figure 5 This is a schematic diagram of the plug-in ring structure of Example 2 of this application

[0041] 1. First fastening lug; 2. Positioning seat; 3. Support structure; 4. First welding strip; 5. Second fastening lug; 6. Foam block; 7. Primary film; 8. Second thermal insulation layer; 9. Secondary film; 10. Tank body; 11. First thermal insulation layer; 12. Insert ring strip; 13. Top cover; 14. Insert groove; 15. Glue injection ring cavity; 16. Sealant; 17. Sealing ring hook; 18. Sealing groove; 19. Locking card slot; 20. Locking card block; 22. Locking cap; 23. Ring groove; 24. Connecting rod; 25. Injection hole; 26. Second welding strip; 27. Positioning socket; 28. Positioning block; 29. ​​Locking plug block; 30. Locking slot; 31. Spacer cavity; 32. Positioning bolt; 33. Flow limiting groove; 34. Positioning net; 36. Compression piece; 37. Sealing layer; 38. Flow limiting ball; 39. Fixed glue layer. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1 - Figure 4 This application is described in further detail.

[0043] The embodiments of the present application disclose a liquefied gas storage device and an assembly method thereof.

[0044] Example 1

[0045] Reference Figure 1 A storage device for liquefied gas includes a support structure 3 and a storage tank fixed to the support structure 3. When the storage device is installed on a ship, the support structure 3 is a structure on the hull. The storage tank includes a tank body 10 and a top cover 13. The tank body 10 is a rectangular tank, and the top cover 13 is a rectangular cover. The tank body 10 is sequentially provided with a first thermal insulation layer 11, a secondary film 9, a second thermal insulation layer 8, and a primary film 7. The primary film 7 and the secondary film 9 are made of stainless steel. The first thermal insulation layer 11 and the second thermal insulation layer 8 are plywood. The plywood supports the secondary film 9 and the primary film 7, improving the stability of the secondary film 9 and the primary film 7 during use. A first fastening lug 1 connected to the primary film 7 is installed on the inner wall of the tank body 10. First welding strips 4 connected to the tank body 10 are welded and fixed on both sides of the first fastening lug 1. The first welding strips 4 can fix the two ends of the first fastening lug 1 to ensure the stability of the first fastening lug 1. A second fastening lug 5 connected to the secondary film 9 is mounted on the bottom of the first fastening lug 1. Multiple positioning seats 2 with an L-shaped cross-section are provided on the bottom side of the first fastening lug 1. Multiple positioning blocks 28 are mounted on the second fastening lug 5, which plug into and mate with the positioning seats 2. The positioning seats 2 are fixed to the side of the second fastening lug 5 closest to the tank body 10, thereby limiting the position of the second fastening lug 5. A second welding strip 26 connected to the first fastening lug 1 is welded to the side of the second fastening lug 5 away from the tank body 10, improving the stability of the second fastening lug 5.

[0046] The second fastening lug 5 is provided with a plurality of positioning holes 27 that are plugged into the positioning blocks 28. The positioning blocks 28 pass through the positioning holes 27 and are plugged into the positioning seat 2, so that the second fastening lug 5 can be fixed more conveniently. The second welding strip 26 is used to close the positioning holes 27 on the side close to the second fastening lug 5. With this design, the second fastening lug 5 is first installed and positioned, and then the positioning block 28 is inserted into the positioning seat 2 through the positioning hole. With the positioning block 28 inserted into the positioning seat 2, the second fastening lug 5 is first stably fixed. Then, the second welding strip 26 is produced by welding to block the positioning hole 27, thereby improving the convenience of welding the second fastening lug 5. Moreover, the positioning block 28 is fixed by passing through the positioning hole 27, so that the positioning block 28 can be installed more conveniently.

[0047] A locking plug 29 is integrally formed on the side of the positioning base 2 close to the second fastening lug 5. A locking slot 30 is provided on the side of the second fastening lug 5 close to the positioning base 2 to engage with the locking plug 29. The locking slot 30 extends through the positioning hole 27, and the locking plug 29 and the positioning block 28 abut against each other. A locking block 20 is integrally formed on the side of the locking plug 29 away from the positioning block 28. A locking groove 19 is provided on the side of the locking slot 30 away from the positioning block 28 to engage with the locking block 20. When the second fastening lug 5 is subjected to pressure from the positioning block 28, the positioning base 2 can be restrained by the locking block 20 engaging with the locking groove 19, thereby improving the stability of the fixation of the second fastening lug 5.

[0048] A positioning bolt 32 is fixed to the inner wall of the second fastening lug 5. The positioning bolt 32 extends through the second insulation layer 8 and is threadedly connected to a locking cap 22 for securing the second insulation layer 8. The locking cap 22 secures the end of the second insulation layer 8. A spacer cavity 31 is formed between the second fastening lug 5 and the tank body 10. The positioning bolt 32 is provided with an injection hole 25 connected to the spacer cavity 31. The injection hole 25 is a cylindrical hole. Expanding foam injected through the injection hole 25 is fixed in the spacer cavity 31. The expandable foam is polyurethane foam and forms a foam block 6 after cooling. This design allows the second fastening lug 5 to better fit the foam block 6, which supports and secures the second fastening lug 5, ensuring its secure fixation.

[0049] A plurality of connecting rods 24 are fixed to one side of the primary film 7 close to the second thermal insulation layer 8. The connecting rods 24 are plugged into the injection hole 25. A plurality of annular grooves 23 are provided on the outer wall of the connecting rod 24. A fixing glue layer 39 is filled between the outer wall of the connecting rod 24 and the inner wall of the injection hole 25. The fixing glue cooperates with the annular groove 23 to make the primary film 7 more firmly fixed to the tank body 10 through the connecting rod 24, thereby improving the fixing stability of the storage device.

[0050] A sealing groove 18 is formed on the upper side of the first fastening lug 1. This groove 18 extends along the length of the first fastening lug 1 and has an L-shaped cross-section. A sealing hook 17 is welded to the bottom of the top cover 13. This L-shaped cross-section seals the hook 17 and seals the groove 18 together to seal the connection between the top cover 13 and the tank body 10. Sealant 16 is injected into the groove 18. The sealant 16 can be made of a low-temperature-resistant material such as epoxy resin or a copolymer of organosiloxane. When the top cover 13 is installed, the hook 17 is inserted into the groove 18. This sealant, in combination with the sealant 16, effectively seals the connection between the top cover 13 and the tank body 10, reducing the risk of temperature leakage from the liquefied gas within the storage device through the gap.

[0051] Example 2

[0052] Reference Figure 4 This embodiment differs from Embodiment 1 in that a flow limiting groove 33 is provided at the opening of the injection hole 25 on the side away from the locking cap 22. The flow limiting groove 33 has a boss-shaped cross-section, and its inner diameter gradually increases as it moves away from the locking cap 22. A limiting net 34 is fixed to the end of the flow limiting groove 33 away from the locking cap 22. A flow limiting ball 38 is installed within the flow limiting groove 33. The flow limiting ball 38 is used to block the injection hole 25. After the expansion foam is fully injected, the flow limiting ball 38 can be pushed into contact with the injection hole 25, thereby achieving the purpose of sealing the injection hole 25. The outer wall of the flow limiting ball 38 is coated with a sealing layer 37 made of a rubber material. A compression member 36 is fixed to the limiting net 34, which is a compression spring and is used to push the flow limiting ball 38 into contact with the injection hole 25.

[0053] This embodiment is different from embodiment 1 in that, unlike Figure 1 、 Figure 2 In the embodiment, the top of the primary film 7 is only connected to the first fastening lug 1. In this embodiment, a plug-in ring strip 12 is also integrally formed on the top of the primary film 7. A plug-in groove 14 is provided at the bottom of the top cover 13 for plugging into the plug-in ring strip 12. The thickness of the plug-in groove 14 gradually decreases in the direction away from the tank body 10. A glue injection ring cavity 15 is formed between the outer wall of the plug-in ring strip 12 and the plug-in groove 14. After the sealant 16 is ejected from the sealing groove 18, the excess sealant 16 is injected into the glue injection ring cavity 15, which can enable the plug-in ring strip 12 to be sealed more stably.

[0054] Example 3

[0055] Reference Figure 5 , a method for assembling a liquefied gas storage device, comprising the following steps:

[0056] Step 1: Weld the fastening lugs to fix the first fastening lug 1 to the side wall of the tank body 10, and then fix the second fastening lug 5 to the first fastening lug 1;

[0057] 1. Fix the upper and lower sides of the first fastening lug 1 by welding, and form a first welding strip 4 to ensure the stability of the fixation of the first fastening lug 1;

[0058] 2. Fix the second fastening lug 5 close to the positioning seat 2, engage the locking block 20 in the locking slot 19, and then insert the positioning block 28 into the positioning seat 2 through the positioning hole 27. Finally, weld and form a second welding strip 26 on the inner side of the second fastening lug 5. The second welding strip 26 blocks the positioning hole 27 to improve the convenience and stability of the installation and fixation of the second fastening lug 5;

[0059] Step 2: Install the structure by laying the first insulation layer 11, the secondary film 9, the second insulation layer 8 and the primary film 7 in sequence; weld the end of the first insulation layer 11 to the second fastening lug 5, and weld the end of the second insulation layer 8 to the first fastening lug 1;

[0060] Step three: Install the top cover 13, insert the top cover 13 into the upper side of the tank body 10, insert the sealing ring hook 17 into the sealing groove 18, squeeze out the sealant 16 in the sealing groove 18, and fill the sealant 16 into the injection ring cavity 15, thereby achieving the closure of the top cover 13 and finally completing the assembly of the storage device.

[0061] The advantage of the present application is that such a design improves the convenience of fixing and assembling the second fastening lug 5 and the first fastening lug 1, while also ensuring the stability of the use of the second fastening lug 5 and the first fastening lug 1; the first fastening lug 1 and the second fastening lug 5 are installed on the side wall of the tank body 10, and the first fastening lug 1 and the second fastening lug 5 can be fixed more conveniently when the cover plate is not installed, and the top cover 13 can be installed more conveniently, thereby improving the convenience of assembling the top cover 13; the sealing ring hook 17 is inserted into the sealing groove 18, and the sealant 16 is used to better seal the connection between the top cover 13 and the tank body 10, thereby reducing the temperature leakage of the liquefied gas in the storage equipment at the gap, thereby ensuring the thermal insulation effect of the storage equipment.

[0062] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A liquefied gas storage device, characterized in that: The invention comprises a support structure (3) and a storage tank fixed on the support structure (3); the storage tank comprises a tank body (10) and a top cover (13); a first heat-insulating layer (11), a secondary film (9), a second heat-insulating layer (8) and a primary film (7) are sequentially laid in the tank body (10); a first fastening lug (1) connected to the primary film (7) is provided on the inner wall of the tank body (10); first welding strips (4) connected to the tank body (10) are provided on both sides of the first fastening lug (1); The first fastening lug (1) is provided with a second fastening lug (5) connected to the secondary film (9), a plurality of positioning seats (2) are provided on the bottom side of the first fastening lug (1), a plurality of positioning blocks (28) plugged into the plurality of positioning seats (2) are provided on the second fastening lug (5), the positioning seat (2) is provided on the side of the second fastening lug (5) close to the tank body (10), and a second fastening lug (5) is provided on the side away from the tank body (10) with the first fastening lug (5). A second welding strip (26) connected to a fastening lug (1); a plurality of positioning holes (27) are provided on the second fastening lug (5) for plugging and cooperating with the plurality of positioning blocks (28); the positioning blocks (28) pass through the positioning holes (27) and are plugged into the positioning seat (2); the second welding strip (26) is used to close the positioning hole (27) on the side close to the second fastening lug (5); a locking mechanism is provided on the side close to the second fastening lug (5) of the positioning seat (2). The second fastening lug (5) is provided with a locking slot (30) on a side close to the positioning seat (2) and is plugged into and matched with the locking plug block (29); the locking slot (30) is opened through the positioning socket (27); a locking card block (20) is provided on a side of the locking plug block (29) away from the positioning block (28); a locking card groove (19) is provided on a side of the locking slot (30) away from the positioning block (28) and is plugged into and matched with the locking card block (20).

2. The liquefied gas storage device according to claim 1, characterized in that: The inner wall of the second fastening lug (5) is provided with a positioning bolt (32), the positioning bolt (32) is inserted into the second thermal insulation layer (8), and the positioning bolt (32) is provided with a locking cap (22) for fixing the second thermal insulation layer (8). A spacing cavity (31) is provided between the second fastening lug (5) and the tank body (10), and an injection hole (25) connected to the spacing cavity (31) is opened on the positioning bolt (32), and the spacing cavity (31) is provided with expansion foam injected by the injection hole (25) to form a foam block (6).

3. The liquefied gas storage device according to claim 2, characterized in that: A plurality of connecting rods (24) are provided on one side of the primary film (7) close to the second heat-insulating layer (8), the connecting rods (24) are plugged into and matched with the injection hole (25), a plurality of annular grooves are provided on the outer wall of the connecting rod (24), and a fixed adhesive layer (39) is filled between the outer wall of the connecting rod (24) and the inner wall of the injection hole (25).

4. The liquefied gas storage device according to claim 3, characterized in that: A sealing groove (18) is provided on the upper side of the first fastening lug (1), and a sealing ring hook (17) is provided at the bottom of the top cover (13). The sealing ring hook (17) is plugged into and matched with the sealing groove (18) to seal the connection between the top cover (13) and the tank body (10), and a sealant (16) is provided in the sealing groove (18).

5. The liquefied gas storage device according to claim 4, characterized in that: A plug-in ring strip (12) is provided on one side of the primary film (7) close to the top cover (13); a plug-in groove (14) is provided at the bottom of the top cover (13) for plugging with the plug-in ring strip (12); and a glue injection ring cavity (15) is formed between the outer wall of the plug-in ring strip (12) and the plug-in groove (14).

6. The liquefied gas storage device according to claim 2, characterized in that: A limiting flow groove (33) is provided at an opening on one side of the injection hole (25) away from the locking cap (22), and the inner diameter of the limiting flow groove (33) gradually increases in a direction away from the locking cap (22). A limiting position net (34) is provided at one end of the limiting flow groove (33) away from the locking cap (22), and a limiting flow ball (38) is provided in the limiting flow groove (33), and the limiting flow ball (38) is used to block the injection hole (25).

7. The liquefied gas storage device according to claim 6, characterized in that: The outer wall of the flow-limiting ball (38) is coated with a sealing layer (37), and the limiting net (34) is provided with a compression member (36) for pushing the flow-limiting ball (38) to abut against the injection hole (25).

8. A method for assembling a liquefied gas storage device, using the liquefied gas storage device according to claim 5, characterized in that: The specific steps are as follows; Step 1: Weld the fastening lugs, fix the first fastening lug (1) to the side wall of the tank body (10), and then fix the second fastening lug (5) to the first fastening lug (1).

1. Fix the upper and lower sides of the first fastening lug (1) by welding to form a first welding strip (4); 2. Install the second fastening lug (5) on the bottom of the first fastening lug (1), then insert the positioning block (28) through the positioning socket (27) and connect it to the positioning seat (2), and finally weld and form a second welding strip (26) on the inner side of the second fastening lug (5), and close the positioning socket (27) through the second welding strip (26); Step 2: Install the structure, lay the first thermal insulation layer (11), the secondary film (9), the second thermal insulation layer (8) and the primary film (7) in sequence, weld the end of the secondary film (9) to the second fastening lug (5), and weld the end of the primary film (7) to the first fastening lug (1); Step three: Install the top cover (13). Install the top cover (13) on the top of the tank (10), insert the sealing ring hook (17) into the sealing groove (18), and use the sealant (16) to achieve the sealing of the top cover (13).

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