Liquefied gas storage equipment and assembling method thereof

Abstract

The invention discloses a liquefied gas storage device and an assembling method thereof, and relates to the field of liquefied gas storage, the liquefied gas storage device comprises a supporting structure and a storage tank fixed on the supporting structure; the storage tank comprises a tank body and a top cover, a first heat insulation layer, a secondary film, a second heat insulation layer and a primary film are sequentially laid in the tank body, a first fastening convex lug is arranged on the inner wall of the tank body, first welding strips are arranged on the two sides of the first fastening convex lug, and a second fastening convex lug connected with the secondary film is arranged on the first fastening convex lug; a plurality of positioning seats are arranged on the bottom side of the first fastening lug, a plurality of positioning blocks matched with the positioning seats in an inserted mode are arranged on the second fastening lug, the positioning seats are arranged on the side, close to the tank body, of the second fastening lug, and a second welding strip connected with the first fastening lug is arranged on the side, away from the tank body, of the second fastening lug. According to the invention, the convenience of fixedly assembling the second fastening convex lug and the first fastening convex lug is improved, and the stability of using the second fastening convex lug and the first fastening convex lug is ensured.

Description

Technical Field

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

[0002] At present, liquefied natural gas storage tanks are professional products for storing liquefied natural gas, which are special equipment. The membrane tank is one of the types of storage tanks. The membrane tank has advantages such as high space utilization rate, relatively light weight, and faster construction speed.

[0003] In the prior art, the patent with the patent number 202180078149.X relates to a membrane tank. The patent name is Liquid Dome for a Storage Tank for Liquefied Gas, which includes a load-bearing structure and a sealed and heat-insulated liquid tank arranged within the load-bearing structure. The load-bearing structure has an upper load-bearing wall, a sealing membrane, a heat-insulating barrier of the main structure, and the upper load-bearing wall is partially interrupted to define a pipeline. The pipeline and the upper cover wall are made of different ferrous alloys, and at least one first fastening lug extending from the upper cover wall is tightly fastened to the primary sealing membrane in a sealed manner, and at least one second fastening lug extending from the upper cover wall is tightly fastened to the secondary membrane connection in a sealed manner.

[0004] In view of the above 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 pipeline is small. During assembly, it is necessary to install the second fastening lug and the first fastening lug in sequence. Since the welding position space between the outer side of the second fastening lug close to the tank body and the outer side of the first fastening lug close to the tank body is small, there is a problem that it is not easy to perform welding fixation. Summary of the Invention

[0005] In order to improve the convenience of fixedly 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 storage device for liquefied gas and an assembly method thereof.

[0006] The storage device for liquefied gas and the assembly method provided by the present application adopt the following technical solutions:

[0007] It includes a support structure and a storage tank fixed on the support structure; the storage tank includes a tank body and a top cover. Inside the tank body, a first heat insulation layer, a secondary film, a second heat insulation layer and a primary film are sequentially laid. On the inner wall of the tank body, there are first fastening lugs connected to the primary film. On both sides of the first fastening lugs, there are first welding strips connected to the tank body. On the first fastening lugs, there are second fastening lugs connected to the secondary film. On the bottom side of the first fastening lugs, there are multiple positioning seats. On the second fastening lugs, there are multiple positioning blocks that are inserted and matched with the multiple positioning seats. The positioning seats are arranged on the side of the second fastening lugs close to the tank body. On the side of the second fastening lugs away from the tank body, there is a second welding strip connected to the first fastening lugs.

[0008] By adopting the above technical solution, during assembly, the first fastening lugs are fixed on the inner wall of the tank body, then the second fastening lugs are fixed on the first fastening lugs, and then the first heat insulation layer, the secondary film, the second heat insulation layer and the primary film are installed in sequence. The two sides of the first fastening lugs are limited by the first welding strips, and the first fastening lugs can be welded conveniently. One side of the second fastening lugs is inserted and matched with the positioning seats through the positioning blocks, and the other side is fixed by the second welding strip, so that the side of the second fastening lugs with a smaller space is locked by the positioning blocks and the positioning seats, reducing the difficulty of welding and fixing the second fastening lugs. With such a design, the convenience of assembling the second fastening lugs and the first fastening lugs can be improved, and the stability of using the second fastening lugs and the first fastening lugs can also be ensured; when the first fastening lugs and the second fastening lugs are installed on the side wall of the tank body, the first fastening lugs and the second fastening lugs can be fixed more conveniently before the cover plate is installed, improving the convenience of assembling the top cover.

[0009] Preferably, on the second fastening lugs, there are multiple positioning holes that are inserted and matched with the multiple positioning blocks. The positioning blocks penetrate through the positioning holes and are inserted on the positioning seats. The side of the second welding strip close to the second fastening lugs is used to seal the positioning holes.

[0010] By adopting the above technical solution, during assembly, first, the second fastening lugs are installed and positioned, and then the positioning blocks are inserted through the positioning holes and inserted on the positioning seats, so that the second fastening lugs can be stably fixed first. Then, the second welding strip is generated by welding to block the positioning holes, improving the convenience of welding the second fastening lugs.

[0011] Preferably, a locking plug is provided on one side of the positioning seat close to the second fastening lug. A locking slot adapted to be plugged with the locking plug is formed on one side of the second fastening lug close to the positioning seat. The locking slot runs through the positioning hole. A locking block is provided on the side of the locking plug away from the positioning block. A locking groove adapted to be clamped with the locking block is formed on the side of the locking slot away from the positioning block.

[0012] By adopting the above technical solution, during assembly, first plug the locking plug into the locking slot, and at the same time clamp the locking block into the locking groove, and then insert the positioning block onto the positioning seat, so as to fix the second fastening lug. With such a design, the second fastening lug can be fixed more firmly. When the second fastening lug is under pressure, through the cooperation of the locking block and the locking groove, the positioning seat and the second fastening lug can be tightened more stably. 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 through the second heat insulation layer. A locking cap for fixing the second heat insulation layer is provided on the positioning bolt. There is a spacer cavity between the second fastening lug and the tank body. An injection hole communicating with the spacer cavity is formed on the positioning bolt. An expanding foam injected through the injection hole is provided in the spacer cavity and forms a foam block.

[0014] By adopting the above technical solution, the cooperation of the positioning bolt and the locking cap is used to reduce the shaking of the second heat insulation layer between the first fastening lug and the second fastening lug, so that the second heat insulation layer can be fixed more stably. Since the spacer cavity between the second fastening lug and the tank body is small, it is difficult to press the first heat insulation layer into the spacer cavity. The expanding foam is injected through the injection port. Thus, the spacer cavity can be filled and forms a foam block after cooling. It can not only play a role in supporting the second fastening lug, but also play a role in heat insulation. Moreover, the filled foam can fill the gaps to ensure the preservation effect of liquefied gas.

[0015] Preferably, a plurality of connecting rods are provided on one side of the primary film close to the second heat insulation layer. The connecting rods are plugged with the injection holes. A plurality of annular grooves are formed on the outer wall of the connecting rods. A fixing glue layer is filled between the outer wall of the connecting rods and the inner wall of the injection holes.

[0016] By adopting the above technical solution, when installing the second heat insulation layer, the second heat insulation layer can be fixed by plugging the connecting rods with the injection holes. Together with the fixing glue layer and the annular grooves, the second heat insulation layer can be fixed more stably and firmly, improving the stability of using the second heat insulation layer.

[0017] Preferably, a sealing groove is formed on the upper side of the first fastening lug, and a sealing ring hook is arranged at the bottom of the top cover. The sealing ring hook is inserted into the sealing groove for closing the connection between the top cover and the tank body, and sealing glue is arranged 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 sealing glue can better seal the connection between the top cover and the tank body, reducing the temperature leakage of the liquefied gas in the storage device at the gap, and ensuring the heat preservation effect of the storage device.

[0019] Preferably, a plugging ring strip is arranged on one side of the primary film close to the top cover, and a plugging groove which is in plugging fit with the plugging ring strip is formed at the bottom of the top cover. A glue injection ring cavity is formed between the outer wall of the plugging ring strip and the plugging groove.

[0020] By adopting the above technical solution, a glue injection ring cavity is formed in the plugging groove, which can make the plugging ring strip more conveniently inserted into the plugging groove, improving the convenience of installing the top cover. When the sealing ring hook is inserted into the sealing groove, the sealing glue can be pressed out of the sealing groove, and a certain amount of sealing glue can be discharged, so that the sealing glue can be pressed into the glue injection ring cavity, thus better achieving the purpose of sealing the top cover. Adopting such a design can make the overall sealing performance of the storage device better and ensure the storage effect of the liquefied gas in the storage device.

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

[0022] By adopting the above technical solution, during use, after injecting the foam, the expanding foam in the spacer cavity will push the flow limiting ball to abut against the injection hole, which can achieve the purpose of closing the injection hole, better ensuring the sealing performance on both sides of the second fastening lug, reducing the injection of the expanding foam into the injection hole, making it more convenient and stable for the connecting rod to be inserted, and improving the heat preservation effect of using the storage device.

[0023] Preferably, a sealing layer is coated on the outer wall of the flow limiting ball, and a compression member for pushing the flow limiting ball to abut against the injection hole is arranged on the limiting net.

[0024] By adopting the above technical solution, the compression member can make the flow limiting ball tightly abut against the injection hole. Cooperating with the use of the sealing layer, the injection hole can be more stably sealed, improving the sealing effect of the injection hole.

[0025] An assembling method for a liquefied gas storage device is as follows in specific steps.

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

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

[0028] 2. Install the second fastening lug at the bottom of the first fastening lug. Then insert the positioning block through the positioning jack and plug it onto the positioning seat. Finally, weld inside the second fastening lug to form the second welding strip, and seal the positioning jack through the second welding strip.

[0029] Step 2: Install the structure. Lay the first heat insulation layer, secondary film, second heat insulation layer and primary film in sequence. Weld and fix the end of the secondary film to the second fastening lug, and weld and fix 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, hook the sealing ring into the sealing groove, and cooperate with the sealing glue to seal the top cover.

[0031] By adopting the above technical solution, when the second fastening lug is fixed, it can be first fixed by the positioning block, and then locked by using the second welding strip, and at the same time, the positioning jack is sealed, achieving the effect of isolation and sealing, and improving the sealing effect of the tank body in use.

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

[0033] 1. During assembly, fix the first fastening lug on the inner wall of the tank body, then fix the second fastening lug on the first fastening lug, and then install the first heat insulation layer, secondary film, second heat insulation layer and primary film 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 welded conveniently to ensure the firmness of the fixation of the first fastening lug. One side of the second fastening lug is inserted and matched with the positioning seat through the positioning block, and the other side is fixed by the second welding strip, so that the side of the second fastening lug close to the outer wall of the tank body is locked by the positioning block and the positioning seat, reducing the difficulty of welding and fixing the second fastening lug. Adopting 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; fixing the first fastening lug and the second fastening lug on the side wall of the tank body can fix the first fastening lug and the second fastening lug more conveniently when the cover plate is not installed, improving the convenience of assembling the top cover.

[0034] 2. By adopting the above technical solution, during assembly, first install and position the second fastening lug, then insert the positioning block through and into the positioning jack, so that the positioning block is inserted onto the positioning seat. This can stably fix the second fastening lug first, and then generate the second welding strip through welding to block the positioning jack, improving the convenience of welding the second fastening lug.

[0035] 3. By inserting the locking plug into the locking slot, simultaneously engaging the locking block in the locking groove, and then inserting the positioning block onto the positioning seat, the fixation of the second fastening lug can be achieved. With such a design, the second fastening lug can be fixed more firmly. When the second fastening lug is under pressure, through the cooperation of the locking block and the locking groove, the positioning seat and the second fastening lug can be tightened more stably, and the positioning block can cooperate to press the locking plug, improving the stability of the positioning of the second fastening lug. Description of the Drawings

[0036] Figure 1 It is a partial cross-sectional view of a storage device for liquefied gas and its assembly method according to Embodiment 1 of the present application;

[0037] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0038] Figure 3 is Figure 1 an enlarged schematic view of part B in

[0039] Figure 4 It is a schematic view mainly showing the structure of the flow-limiting groove according to Embodiment 2 of the present application;

[0040] Figure 5 It is a schematic view mainly showing the structure of the insertion ring strip according to Embodiment 2 of the present application

[0041] Reference Numerals: 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 heat insulation layer; 9. Secondary film; 10. Tank body; 11. First heat insulation layer; 12. Insertion ring strip; 13. Top cover; 14. Insertion slot; 15. Glue injection ring cavity; 16. Sealing glue; 17. Sealing ring hook; 18. Sealing groove; 19. Locking groove; 20. Locking block; 22. Locking cap; 23. Ring groove; 24. Connecting rod; 25. Injection hole; 26. Second welding strip; 27. Positioning jack; 28. Positioning block; 29. Locking plug; 30. Locking slot; 31. Spacing cavity; 32. Positioning bolt; 33. Flow-limiting groove; 34. Limiting net; 36. Compression member; 37. Sealing layer; 38. Flow-limiting ball; 39. Fixed glue layer. Detailed Embodiment

[0042] The following is combined with the attachedFigure 1 - Figure 4 Further details of this application are provided below.

[0043] An embodiment of this application discloses a storage device for liquefied gas and an assembly method thereof.

[0044] Embodiment 1

[0045] Referring to Figure 1 , a storage device for liquefied gas includes a support structure 3 and a storage tank fixed on 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. A first heat insulation layer 11, a secondary film 9, a second heat insulation layer 8, and a primary film 7 are sequentially laid in the tank body 10. The primary film 7 and the secondary film 9 are made of stainless steel material, and the first heat insulation layer 11 and the second heat insulation layer 8 are plywood. The secondary film 9 and the primary film 7 can be supported by the plywood to improve the stability of the use of the secondary film 9 and the primary film 7. A first fastening lug 1 connected to the primary film 7 is installed on the inner wall of the tank body 10. Two sides of the first fastening lug 1 are welded and fixed to a first welding strip 4 connected to the tank body 10. The two ends of the first fastening lug 1 can be fixed by the first welding strip 4 to ensure the stability of the fixation of the first fastening lug 1. A second fastening lug 5 connected to the secondary film 9 is installed at the bottom of the first fastening lug 1. A plurality of positioning seats 2 are arranged on the bottom side of the first fastening lug 1. The cross-section of the positioning seat 2 is L-shaped. A plurality of positioning blocks 28 inserted and matched with the plurality of positioning seats 2 are installed on the second fastening lug 5. The positioning seat 2 is fixed on the side of the second fastening lug 5 close to the tank body 10, so as to limit the second fastening lug 5. A second welding strip 26 connected to the first fastening lug 1 is welded and fixed on the side of the second fastening lug 5 away from the tank body 10 to improve the stability of the fixation of the second fastening lug 5.

[0046] A plurality of positioning jacks 27 inserted and matched with the positioning blocks 28 are formed through the second fastening lug 5. The positioning blocks 28 penetrate through the positioning jacks 27 and are inserted on the positioning seats 2, so that the second fastening lug 5 can be fixed more conveniently; the side of the second welding strip 26 close to the second fastening lug 5 is used to seal the positioning jacks 27. With such a design, first, the second fastening lug 5 is installed and positioned, and then the positioning blocks 28 penetrate through the positioning jacks and are inserted on the positioning seats 2, so that the positioning blocks 28 are inserted on the positioning seats 2, which can first stably fix the second fastening lug 5, and then generate the second welding strip 26 through welding to block the positioning jacks 27, improving the convenience of welding the second fastening lug 5; and by using the method of the positioning blocks 28 penetrating through the positioning jacks 27 to fix the positioning blocks 28, the positioning blocks 28 can be installed on the second fastening lug 5 more conveniently.

[0047] One side of the positioning seat 2 close to the second fastening lug 5 is integrally formed with a locking plug 29. A locking slot 30 for plugging and mating with the locking plug 29 is provided on one side of the second fastening lug 5 close to the positioning seat 2. The locking slot 30 runs through the positioning jack 27. The locking plug 29 abuts against the positioning block 28. On the side of the locking plug 29 away from the positioning block 28, a locking catch 20 is integrally formed. A locking groove 19 for clamping and mating with the locking catch 20 is provided on the side of the locking slot 30 away from the positioning block 28. When pressure is applied to the second fastening lug 5. When pressure is applied to the positioning seat 2 by the positioning block 28, through the cooperation of the locking catch 20 and the locking groove 19, the positioning seat 2 can be restricted, improving the fixing stability of the second fastening lug 5.

[0048] A positioning bolt 32 is fixed on the inner wall of the second fastening lug 5. The positioning bolt 32 passes through the second heat insulation layer 8. A locking cap 22 for fixing the second heat insulation layer 8 is in threaded fit connection on the positioning bolt 32. The end of the second heat insulation layer 8 is fixed through the locking cap 22. An interval cavity 31 is formed between the second fastening lug 5 and the tank body 10. An injection hole 25 communicating with the interval cavity 31 is provided on the positioning bolt 32. The injection hole 25 is a cylindrical hole. Expanded foam is fixed in the interval cavity 31 and injected through the injection hole 25. The expanded foam is polyurethane foam, which forms a foam block 6 after cooling. And with such a design, the second fastening lug 5 can better fit the foam block 6. The foam block 6 can support and fix the second fastening lug 5, ensuring the firmness of the fixing of the second fastening lug 5.

[0049] A plurality of connecting rods 24 are fixed on one side of the primary film 7 close to the second heat insulation layer 8. The connecting rods 24 are in plugging fit with the injection holes 25. A plurality of annular grooves 23 are provided on the outer wall of the connecting rods 24. A fixing glue layer 39 is filled between the outer wall of the connecting rods 24 and the inner wall of the injection holes 25. Through the cooperation of the fixing glue and the annular grooves 23, the primary film 7 can be more firmly fixed on the tank body 10 through the connecting rods 24, improving the fixing stability of the storage device in use.

[0050] A sealing groove 18 is provided on the upper side of the first fastening lug 1. The sealing groove 18 extends along the length of the first fastening lug 1. The cross-section of the sealing groove 18 is L-shaped. A sealing ring hook 17 is welded and fixed to the bottom of the top cover 13. The cross-section of the sealing ring hook 17 is L-shaped. The sealing ring hook 17 is in plugging fit with the sealing groove 18 for closing the connection between the top cover 13 and the tank body 10. Sealing glue 16 is injected into the sealing groove 18. The sealing glue 16 can be made of low-temperature resistant materials such as copolymers of epoxy resin or silicone oxane. When installing the top cover 13, insert the sealing ring hook 17 into the sealing groove 18. With the cooperation of the sealing glue 16, the connection between the top cover 13 and the tank body 10 can be better sealed, reducing the temperature leakage of the liquefied gas in the storage device at the gap.

[0051] Embodiment 2

[0052] Referring to Figure 4 , the difference between this embodiment and Embodiment 1 is that a flow limiting groove 33 is provided at the opening on the side of the injection hole 25 away from the locking cap 22. The cross-section of the flow limiting groove 33 is in the shape of a boss. The inner diameter of the flow limiting groove 33 gradually increases in the direction away from the locking cap 22. A limiting net 34 is fixed at one end of the flow limiting groove 33 away from the locking cap 22. A flow limiting ball 38 is installed in the flow limiting groove 33. The flow limiting ball 38 is used to block the injection hole 25. Thus, after the expanded foam is filled, the flow limiting ball 38 can be pushed to abut against the injection hole 25, so as to achieve the purpose of closing the injection hole 25. The outer wall of the flow limiting ball 38 is coated with a sealing layer 37. The sealing layer 37 is made of rubber material. A compression member 36 for pushing the flow limiting ball 38 to abut against the injection hole 25 is fixed on the limiting net 34. The compression member 36 is a compression spring.

[0053] Another difference between this embodiment and Embodiment 1 is that, different from Figure 1 , Figure 2 wherein the top end of the primary film 7 is only connected to the first fastening lug 1, in this embodiment, a plugging ring strip 12 is integrally formed at the top end of the primary film 7. A plugging groove 14 adapted to be plugged with the plugging ring strip 12 is provided at the bottom of the top cover 13. The thickness of the plugging 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 plugging ring strip 12 and the plugging groove 14; after the sealing glue 16 is ejected from the sealing groove 18, the excess sealing glue 16 is injected into the glue injection ring cavity 15, so that the plugging ring strip 12 can be more stably sealed.

[0054] Embodiment 3

[0055] Referring to Figure 5 , an assembling method of a liquefied gas storage device includes the following steps:

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

[0057] 1. Fix both the upper and lower sides of the first fastening lug 1 by welding to 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. The locking block 20 is snapped into the locking slot 19. Then insert the positioning block 28 through the positioning jack 27 into the positioning seat 2. Finally, weld and form a second welding strip 26 inside the second fastening lug 5 to block the positioning jack 27 with the second welding strip 26, improving the convenience and stability of the installation and fixation of the second fastening lug 5;

[0059] Step 2: Installation structure. Lay the first heat insulation layer 11, the secondary film 9, the second heat insulation layer 8, and the primary film 7 in sequence. The end of the first heat insulation layer 11 is welded and fixed to the second fastening lug 5, and the end of the second heat insulation layer 8 is welded and fixed to the first fastening lug 1.

[0060] Step 3: Installation of the top cover 13. Insert the top cover 13 onto the upper side of the tank body 10, so that the sealing ring hook 17 is inserted into the sealing groove 18, the sealant 16 in the sealing groove 18 is extruded, and the sealant 16 is filled into the sealant injection ring cavity 15, thereby realizing the closure of the top cover 13 and finally completing the assembly work of the storage device.

[0061] The advantage of this application is that with such a design, while improving the convenience of fixing and assembling the second fastening lug 5 and the first fastening lug 1, it can also ensure the stability of using the second fastening lug 5 and the first fastening lug 1. Installing the first fastening lug 1 and the second fastening lug 5 on the side wall of the tank body 10 can more conveniently fix the first fastening lug 1 and the second fastening lug 5 when the cover plate is not installed, and can more conveniently install the top cover 13, improving the convenience of assembling the top cover 13. Inserting the sealing ring hook 17 into the sealing groove 18 and cooperating with the sealant 16 can better seal the connection between the top cover 13 and the tank body 10, reducing the occurrence of temperature leakage of the liquefied gas in the storage device at the gap, and ensuring the heat preservation effect of the storage device.

[0062] The above are all the preferred embodiments of this application. The protection scope of this application is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A storage device for liquefied gas, characterized in that: Comprising a support structure (3) and a storage tank fixed to the support structure (3); the storage tank includes a tank body (10) and a top cover (13), a first heat insulation layer (11), a secondary film (9), a second heat insulation 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 arranged on the inner wall of the tank body (10), first welding strips (4) connected to the tank body (10) are arranged on both sides of the first fastening lug (1), a second fastening lug (5) connected to the secondary film (9) is arranged on the first fastening lug (1), a plurality of positioning seats (2) are arranged on the bottom side of the first fastening lug (1), a plurality of positioning blocks (28) in plug-in fit with the plurality of positioning seats (2) are arranged on the second fastening lug (5), the positioning seats (2) are arranged on the side of the second fastening lug (5) close to the tank body (10), and a second welding strip (26) connected to the first fastening lug (1) is arranged on the side of the second fastening lug (5) far from the tank body (10).

2. The storage device for liquefied gas according to claim 1, characterized in that: A plurality of positioning insertion holes (27) in plug-in fit with the plurality of positioning blocks (28) are penetrated through the second fastening lug (5), the positioning blocks (28) penetrate through the positioning insertion holes (27) and are plugged on the positioning seats (2), and the side of the second welding strip (26) close to the second fastening lug (5) is used for closing the positioning insertion holes (27).

3. The storage device for liquefied gas according to claim 2, characterized in that: A locking insertion block (29) is arranged on the side of the positioning seat (2) close to the second fastening lug (5), a locking slot (30) in plug-in fit with the locking insertion block (29) is opened on the side of the second fastening lug (5) close to the positioning seat (2), the locking slot (30) is penetrated through the positioning insertion holes (27), a locking block (20) is arranged on the side of the locking insertion block (29) far from the positioning block (28), and a locking groove (19) in clamping fit with the locking block (20) is opened on the side of the locking slot (30) far from the positioning block (28).

4. A storage device for liquefied gas according to claim 1, characterized in that: A positioning bolt (32) is arranged on the inner wall of the second fastening lug (5), the positioning bolt (32) is inserted through the second heat insulation layer (8), a locking cap (22) for fixing the second heat insulation layer (8) is arranged on the positioning bolt (32), an interval cavity (31) exists between the second fastening lug (5) and the tank body (10), an injection hole (25) communicated with the interval cavity (31) is opened on the positioning bolt (32), and an expansion foam injected through the injection hole (25) is arranged in the interval cavity (31) to form a foam block (6).

5. The storage device for liquefied gas according to claim 4, wherein: A plurality of connecting rods (24) are arranged on the side of the primary film (7) close to the second heat insulation layer (8), the connecting rods (24) are in plug-in fit with the injection holes (25), a plurality of annular grooves are opened on the outer wall of the connecting rods (24), and a fixing glue layer (39) is filled between the outer wall of the connecting rods (24) and the inner wall of the injection holes (25).

6. The storage device for liquefied gas according to claim 1, characterized in that: A sealing groove (18) is provided on the upper side of the first fastening lug (1). A sealing ring hook (17) is provided at the bottom of the top cover (13). The sealing ring hook (17) is inserted into the sealing groove (18) for closing the connection between the top cover (13) and the tank body (10). A sealing glue (16) is provided in the sealing groove (18).

7. A storage device for liquefied gas according to claim 6, characterized in that: A plugging ring strip (12) is provided on one side of the primary film (7) close to the top cover (13). A plugging groove (14) which is in plugging cooperation with the plugging ring strip (12) is provided at the bottom of the top cover (13). A glue injection ring cavity (15) is formed between the outer wall of the plugging ring strip (12) and the plugging groove (14).

8. The storage device for liquefied gas according to claim 4, characterized in that: A current-limiting groove (33) is provided at the opening on the side of the injection hole (25) far from the locking cap (22). The inner diameter of the current-limiting groove (33) gradually increases in the direction far from the locking cap (22). A limiting net (34) is provided at one end of the current-limiting groove (33) far from the locking cap (22). A current-limiting ball (38) is provided in the current-limiting groove (33). The current-limiting ball (38) is used for blocking the injection hole (25).

9. The storage device for liquefied gas according to claim 8, wherein: A sealing layer (37) is coated on the outer wall of the current-limiting ball (38). A compression member (36) for pushing the current-limiting ball (38) to abut against the injection hole (25) is provided on the limiting net (34).

10. A method for assembling a liquefied gas storage device, using a liquefied gas storage device as described in any one of claims 1-9, characterized in that, The specific steps are as follows; Step 1; Weld the fastening lugs. Fix the first fastening lug (1) on the side wall of the tank body (10), and then fix the second fastening lug (5) on the first fastening lug (1).

1. Fix both 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) at the bottom of the first fastening lug (1). Then insert the positioning block (28) through the positioning jack (27) and plug it on the positioning seat (2). Finally, weld inside the second fastening lug (5) to form a second welding strip (26), and close the positioning jack (27) through the second welding strip (26); Step 2; Install the structure. Lay the first heat insulation layer (11), the secondary film (9), the second heat insulation layer (8) and the primary film (7) in sequence. The end of the secondary film (9) is welded and fixed to the second fastening lug (5), and the end of the primary film (7) is welded and fixed to the first fastening lug (1). Step 3; Install the top cover (13). Install the top cover (13) on the top of the tank body (10), insert the sealing ring hook (17) into the sealing groove (18), and cooperate with the sealing glue (16) to realize the sealing of the top cover (13).

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