Liquid cargo tank insulation fixing structure and liquid cargo tank insulation system

Abstract

The application provides a liquid cargo tank heat insulation layer fixing structure and a liquid cargo tank heat insulation system, wherein the liquid cargo tank heat insulation layer fixing structure comprises a pre-embedded part, a fixing rod, a fixing sheet and a fastener; the pre-embedded part is pre-fixed on the outer surface of the liquid cargo tank, and the bottom end of the fixing rod is connected with the pre-embedded part; the fixing sheet comprises a lower recess part, a folded edge part and a limiting part, and the lower recess part is a groove structure; the lower recess part is arranged on the top of the fixing rod, and the top of the lower recess part is provided with the folded edge part on the opposite sides; the limiting part is connected with the two opposite folded edge parts at both ends, and is used for limiting the maximum separation distance of the two folded edge parts at least; and the fastener is connected with the top end of the fastener through the bottom surface of the lower recess part of the fixing sheet. The maximum separation distance of the folded edge part of the fixing sheet of the pre-embedded part is controlled, so that the separation deformation amount is reduced, the deformation separation trend of the adjacent pre-embedded heat insulation plate can be further inhibited, the risk of plate joint cracking is reduced, and the heat insulation effect is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship liquid cargo tank insulation system design, in particular to a liquid cargo tank insulation layer fixing structure and a liquid cargo tank insulation system. BACKGROUND

[0002] The liquid-tight shell for loading low-temperature liquid cargo on a liquefied gas carrier is generally referred to as a liquid cargo tank, and the liquid-tight shell for storing liquefied gas fuel on various ships is generally referred to as a fuel tank. The liquid cargo tank structure is complex, and the low-temperature deformation under working condition is large. The plate-type insulation system has high strength in theory and is more suitable for application in the insulation protection of the predetermined type of liquid cargo tank.

[0003] The plate-type insulation system generally includes a plurality of prefabricated insulation plates, the plurality of prefabricated insulation plates are laid on the surface of the liquid cargo tank to form a plate-type insulation layer, and a fixing structure is installed in the gap between adjacent prefabricated insulation plates to limit and fix the prefabricated insulation plates.

[0004] However, when the liquid cargo tank is loaded with liquid cargo and the tank body deforms at low temperature, the plate joints between the prefabricated insulation plates bear more deformation than the prefabricated insulation plates. Since the existing fixing structure also deforms, the existing fixing strength is insufficient, the plate joints are prone to cracking, and the heat insulation effect at the plate joints between the adjacent prefabricated insulation plates is poor, which causes the cold energy inside the liquid cargo tank to dissipate from the plate joints, thereby forming cold spots at these cold energy dissipation sites, further damaging the insulation system, and further reducing the insulation effect. SUMMARY

[0005] The purpose of the present application is to provide a liquid cargo tank insulation layer fixing structure and a liquid cargo tank insulation system, wherein the maximum separation distance of the folded edge part of the fixing piece of the prefabricated insulation plate is controlled, so that the separation deformation amount is reduced, the deformation separation trend of the adjacent prefabricated insulation plates can be further inhibited, the risk of plate joint cracking is reduced, and the heat insulation effect is guaranteed.

[0006] In a first aspect, a liquid cargo tank insulation layer fixing structure is provided, which includes a pre-embedded part, a fixing rod, a fixing piece, and a fastener; the pre-embedded part is pre-fixed on the outer surface of the liquid cargo tank, and the bottom end of the fixing rod is connected with the pre-embedded part; the fixing piece includes a concave part, a folded edge part, and a limiting part, and the concave part is a groove structure; the concave part is arranged on the top of the fixing rod, and the top of the concave part is provided with the folded edge part on the opposite sides; the limiting part is connected with the folded edge parts arranged on the opposite sides at both ends, and is used to limit at least the maximum separation distance of the two folded edge parts; and the fastener is connected with the top end of the fastener through the bottom surface of the concave part of the fixing piece.

[0007] In an implementable scheme, the limiting part of the fixing structure is a long strip-shaped structure, the limiting part is arranged across the concave part, and both ends of the limiting part are fixedly connected with the folded edge parts on the two sides.

[0008] In an embodiment, the number of the limiting members is two, which are arranged in parallel and expose the middle region of the lower recess.

[0009] In an embodiment, the number of the limiting members is one, which is arranged across the middle of the lower recess and has a hole in the middle for the fastener to pass through.

[0010] In an embodiment, the limiting member of the fixing structure is a cross-shaped sheet structure, which includes a first extending direction and a second extending direction. The structure of the first extending direction covers the top opening of the lower recess, and the two ends of the second extending direction are fixedly connected with the two side edge portions, respectively. The middle of the limiting member is provided with a hole for the fastener to pass through.

[0011] In an embodiment, the limiting member of the fixing structure is a square sheet structure, which covers the top opening of the lower recess and the edge portion. The limiting member in the square sheet structure is fixedly connected with the edge portion. The middle of the limiting member is provided with a hole for the fastener to pass through.

[0012] In an embodiment, the limiting member of the fixing structure includes at least a first end and a second end. The end of the first end and the second end of the limiting member is bent back more than 90° to form a limiting groove. The limiting member is arranged across the lower recess of the fixing sheet, and the two opposite edge portions of the fixing sheet are inserted into the limiting grooves of the first end and the second end, respectively.

[0013] In an embodiment, the end of the first end and the second end of the limiting member is bent back 180° to form a limiting groove.

[0014] In an embodiment, the angle between the side wall of the lower recess and the edge portion of the fixing sheet is less than 90°.

[0015] In an embodiment, the fixing structure further includes an elastic heat insulation bushing, which is sleeved on the outer wall of the fixing rod to wrap the fixing rod.

[0016] In an embodiment, the fixing structure further includes a heat insulation filling block, which is arranged in the lower recess of the fixing sheet.

[0017] In an embodiment, the fixing sheet is provided with a reinforcing structure at the connection between the lower recess and the edge portion, and a reinforcing structure at the connection between the bottom surface and the side surface of the lower recess.

[0018] In an embodiment, the edge portion of the edge portion of the fixing sheet is provided with a downward tooth-shaped structure.

[0019] Secondly, a liquid cargo tank insulation system is also provided, including prefabricated insulation panels, the aforementioned fixed structure, and joint insulation panels. If the prefabricated insulation panels are laid on the outer surface of the liquid cargo tank and assembled to form a panel-type insulation layer; the prefabricated insulation panels include an inner layer and an outer layer attached to the upper surface of the inner layer; the sidewall of the outer layer is a predetermined distance from the sidewall of the inner layer to form a stepped surface on the edge surface of the inner layer; wherein, adjacent prefabricated insulation panels include a first joint between adjacent inner layers and a second joint between adjacent outer layers. Several fixing structures are installed in the first joint of adjacent prefabricated insulation panels. Embedded parts are pre-fixed to the outer surface of the liquid cargo tank corresponding to the first joint. The bottom end of a fixing rod is connected to an embedded part, and the fixing rod extends outward along the panel joint, with its top end lower than the stepped surface of the prefabricated insulation panel. A recessed portion is a groove shape adapted to the width of the first joint, and is located within the first joint. The corresponding folded edge covers the stepped surface of the adjacent prefabricated insulation panel. Fasteners pass through the bottom surface of the recessed portion and connect to the top of the fastener, so that the folded edge is pressed tightly against the stepped surface of the prefabricated insulation panel. The joint insulation panel is sealed and filled in the second joint of the prefabricated insulation panels.

[0020] In one feasible embodiment, the liquid cargo tank insulation system further includes a protective layer and a liquid-tight layer; the protective layer is laid on the upper surface of the prefabricated insulation panel and the joint insulation panel, with the edges of adjacent protective layers overlapping; the liquid-tight layer covers the joint of the adjacent inner layers, covers the fixed structure, and is pressed tightly by the joint insulation panel.

[0021] Compared with the prior art, the beneficial effects of this application include at least the following: when the liquid cargo tank is loaded with liquid cargo and the tank body undergoes low-temperature deformation, the prefabricated insulation panels undergo a certain degree of deformation, leading to a tendency for the gaps between the prefabricated insulation panels to widen. However, in the fixing structure of this application, the folded portion of the pressing step surface is constrained by the limiting member, so the two opposing folded portions cannot continue to separate. That is, the separation deformation generated by the fixing piece is effectively controlled, thereby suppressing the separation tendency of the step surface pressed by the folded portion. This can reduce the tendency for the gaps between adjacent prefabricated insulation panels to widen to a certain extent, reduce the risk of cracking at the gap seal, improve the heat insulation effect at the gap, reduce cold loss, avoid the formation of cold spots, and ensure the heat insulation effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram illustrating the assembled state of a prefabricated insulation panel according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of an exploded structure of a fixed structure shown in an embodiment of this application;

[0025] Figure 3 This is a partial structural cross-sectional schematic diagram of a liquid cargo tank insulation system according to an embodiment of this application;

[0026] Figure 4 for Figure 3 A schematic diagram of the exploded structure of the fixed structure in the diagram;

[0027] Figure 5 This is a schematic diagram of the structure of the first type of fixing piece shown in the embodiments of this application;

[0028] Figure 6 This is a schematic diagram of the structure of the second type of fixing piece shown in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the structure of the third type of fixing piece shown in the embodiments of this application;

[0030] Figure 8 This is a schematic diagram of the structure of the fourth type of fixing piece shown in the embodiments of this application;

[0031] Figure 9 This is a schematic diagram of the structure of a limiting member shown in an embodiment of this application;

[0032] Figure 10 This is a schematic diagram of the structure of the fifth type of fixing piece shown in the embodiments of this application;

[0033] Figure 11 for Figure 10 Side view of the fixing piece in the middle;

[0034] Figure 12 This is a schematic diagram of a fixing piece with a reinforcing structure, as shown in an embodiment of this application.

[0035] In the diagram: 1. Prefabricated insulation panel; 11. Inner layer; 12. Outer layer; 13. Stepped surface; 2. Fixing structure; 21. Embedded part; 22. Fixing rod; 23. Fixing piece; 231. Recessed part; 2311. Through hole; 232. Folded edge; 233. Limiting part; 2331. Opening; 2332. Limiting groove; 234. Reinforcing structure; 235. Toothed structure; 24. Fastener; 25. Elastic insulation bushing; 26. Insulation filler block; 3. Joint insulation panel; 4. Protective layer; 5. Liquid-tight layer; 6. Liquid cargo tank; 61. Raised structure. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0038] like Figure 1 In the partial top view of the liquid cargo tank insulation layer shown, the cargo tank insulation layer includes several prefabricated insulation panels 1 laid on the surface of the liquid cargo tank. A stepped surface 13 is formed on the side wall of the prefabricated insulation panel 1, and a panel seam is formed between adjacent prefabricated insulation panels 1. A fixing structure 2 is set in the panel seam.

[0039] like Figure 2 As shown, this application embodiment first provides a cargo hold insulation layer fixing structure. The fixing structure 2 includes an embedded part 21, a fixing rod 22, a fixing piece 23, and a fastener 24. The embedded part 21 is pre-fixed to the outer surface of the liquid cargo tank 6, and the bottom end of the fixing rod 22 is connected to the embedded part 21.

[0040] The fixing piece 23 includes a recessed portion 231, a folded edge portion 232, and a limiting member 233. The recessed portion 231 has a groove-shaped structure, and its width is adapted to the gap between adjacent prefabricated insulation panels 1. The recessed portion 231 is mounted on the top of the fixing rod 22, and the folded edge portion 232 is provided on both sides of the top of the recessed portion 231. The two ends of the limiting member 233 are respectively connected to the two oppositely provided folded edge portions 232, at least to limit the maximum separation distance between the two folded edge portions 232. The bottom surface of the recessed portion 231 of the fixing piece 23 has a through hole 2311. The fastener 24 passes through the through hole 2311 on the bottom surface of the recessed portion 231 and is connected to the top of the fastener 24, so that the fixing piece 23 is securely connected to the fixing rod 22, and the folded edge portion 232 of the fixing piece 23 is pressed against the stepped surface 13 of the prefabricated insulation panel 1.

[0041] When the liquid cargo tank is loaded with liquid cargo and the tank body undergoes low-temperature deformation, the prefabricated insulation panels 1 will deform to a certain extent, causing the gaps between the prefabricated insulation panels 1 to tend to widen. However, in the fixed structure 2, the folded edge 232 of the pressing step surface 13 is bound by the limiting member 233, so the two opposing folded edges 232 cannot continue to separate. That is, the separation deformation caused by the fixing piece 23 is effectively controlled, thereby suppressing the separation tendency of the step surface 13 pressed by the folded edge 232. This can reduce the widening tendency of the gaps between adjacent prefabricated insulation panels 1 to a certain extent, reduce the risk of cracking at the gap seal, improve the heat insulation effect at the gap, reduce cold loss, avoid the formation of cold spots, and ensure the heat insulation effect.

[0042] In some embodiments, the embedded part 21 can be a welded bolt embedded in the surface of the liquid cargo tank 6, the fastener 24 can be a standard bolt, and the two ends of the fixing rod 22 can be provided with internal threaded holes for threaded engagement with the embedded part 21 and the fastener 24, respectively. The fixing rod 22 can be made of a material with low thermal conductivity, including but not limited to wood, plastic, composite materials, etc., thereby reducing the heat transmitted along the axial direction of the fixing rod 22.

[0043] In some embodiments, the fixing plate 23 is made of a low-temperature resistant material, including but not limited to metal, plastic, composite material, etc.

[0044] In some embodiments, such as Figure 3 and Figure 4 As shown, the fixing structure 2 may further include an elastic insulating bushing 25 and an insulating filler block 26. The elastic insulating bushing 25 is fitted onto the outer wall of the fixing rod 22 to enclose the fixing rod 22, and the insulating filler block 26 is filled in the recess 231 of the fixing plate 23. The materials of the elastic insulating bushing 25 and the insulating filler block 26 include, but are not limited to, glass wool, elastic cotton, aerogel felt, polyethylene plastic, etc., and their function is to fill gaps and maintain good insulation effect. In addition, a filler layer (not shown in the figure) may be provided between the insulating filler block 26 and the fastener 24, the materials of which include, but are not limited to, low temperature adhesive, silicone, epoxy resin adhesive, etc., to further increase the sealing and heat insulation effect.

[0045] In some embodiments, such as Figure 5 and Figure 6 As shown, the limiting member 233 of the fixing structure 2 can be a long strip-shaped structure. The limiting member 233 spans across the recessed portion 231, and its two ends are fixedly connected to the folded edges 232 on both sides, for example, by welding or by fasteners, or by buckles.

[0046] For example, such as Figure 5 As shown, there are two limiting members 233, which are arranged in parallel and expose the middle area of ​​the recessed part 231.

[0047] For example, such asFigure 6 As shown, there is one limiting member 233, which spans the middle of the recess 231, and the middle of the limiting member 233 is provided with an opening 2331 for the fastener 24 to pass through.

[0048] In some embodiments, such as Figure 7 As shown, the limiting member 233 of the fixing structure 2 can be a cross-shaped sheet structure. The cross-shaped sheet structure includes a first extending direction and a second extending direction. The structure in the first extending direction covers the top opening of the recess 231. The two ends of the second extending direction are respectively connected to the folded edges 232 on both sides. The middle part of the limiting member 233 is provided with an opening 2331 for the fastener 24 to pass through.

[0049] In some embodiments, such as Figure 8 As shown, the limiting member 233 of the fixing structure 2 is a square sheet structure that covers the top opening of the recessed portion 231 and the folded edge portion 232. The limiting member 233, which is square sheet structure, is connected to the folded edge portion 232. An opening 2331 for the fastener 24 to pass through is provided in the middle of the limiting member 233.

[0050] In some embodiments, such as Figure 9 and Figure 10 As shown, the limiting member 233 of the fixing structure 2 includes at least a first end and a second end. The ends of the first end and the second end of the limiting member 233 are bent toward the back side at a greater than 90° to form a limiting groove 2332. The limiting member 233 spans the recessed portion 231 of the fixing piece 23, and the two opposite folded edges 232 of the fixing piece 23 are respectively inserted into the limiting grooves 2332 of the first end and the second end.

[0051] In addition, such as Figure 6 , Figure 7 and Figure 8 The limiting member 233 shown may also have limiting grooves 2332 formed at both ends, and be inserted into the folded edge portion 232.

[0052] In this embodiment, since the limiting member 233 has limiting grooves 2332 at both ends and is inserted into the folded edge portion 232, it effectively limits the maximum separable distance between the two folded edge portions 232. This suppresses the separation tendency of the stepped surface 13 pressed by the folded edge portion 232, thereby reducing the tendency of the gap between adjacent prefabricated insulation panels 1 to a certain extent, reducing the risk of cracking at the gap seal, and improving the heat insulation effect at the gap. Furthermore, if the prefabricated insulation panel 1 expands due to temperature rise, since the limiting grooves 2332 only limit the maximum separable distance between the two folded edge portions 232, the two folded edge portions 232 can still approach each other under the deformation and compression of the adjacent prefabricated insulation panels 1. Thus, it can be seen that the insertion and engagement structure of the limiting grooves 2332 at both ends of the limiting member 233 with the folded edge portion 232, while limiting the maximum separable distance between the two folded edge portions 232, also allows the two folded edge portions 232 to have the ability to approach each other.

[0053] In some embodiments, such as Figure 11 As shown, the ends of the first and second ends of the limiting member 233 can be bent 180° to the opposite side to form a limiting groove 2332.

[0054] In some embodiments, such as Figure 11 As shown, in the structure of the fixing piece 23, the angle between the side wall of the recessed portion 231 and the folded edge portion 232 is preferably less than 90°, so that the folded edge portion 232 has a downward sloping form, thereby making its fit and pressing with the step surface 13 more firmly, and at the same time, it can also offset part of the deformation force generated by the deformation of the liquid cargo tank 6.

[0055] In some embodiments, such as Figure 12 As shown, the edge of the folded edge 232 of the fixing piece 23 may be provided with a downward-facing toothed structure 235 to better suppress the expansion of the plate seam and improve the stability of the fixing.

[0056] In some embodiments, such as Figure 12 As shown, in the fixing piece 23, a reinforcing structure 234 can be provided at the connection between the recessed portion 231 and the folded edge portion 232, and a reinforcing structure 234 can be provided at the connection between the bottom surface and the side surface of the recessed portion 231. Specifically, a groove can be pressed out at the folded corner as a reinforcing structure 234, or a strip-shaped groove can be pressed out at the connection as a reinforcing structure 234, etc.

[0057] like Figure 3 As shown in the figure, this application embodiment also provides a liquid cargo tank insulation system, including a plurality of prefabricated insulation panels 1, a plurality of the aforementioned fixed structures 2, and joint insulation panels 3.

[0058] If the prefabricated insulation panel 1 is laid on the outer surface of the liquid cargo tank 6 and assembled to form a panel-type insulation layer. The prefabricated insulation panel 1 includes an inner layer 11 and an outer layer 12 attached to the upper surface of the inner layer 11; the sidewall of the outer layer 12 is at a predetermined distance from the sidewall of the inner layer 11 to form a stepped surface 13 on the edge surface of the inner layer 11; wherein, there is a first joint between adjacent prefabricated insulation panels 1 and a second joint between adjacent inner layers 11.

[0059] Several fixing structures 2 are installed in the first joint of adjacent prefabricated insulation panels 1. Embedded parts 21 are pre-fixed to the outer surface of the liquid cargo tank 6 corresponding to the first joint. The bottom end of the fixing rod 22 is connected to the embedded parts 21. The fixing rod 22 extends outward along the joint, and the top of the fixing rod 22 is lower than the stepped surface 13 of the prefabricated insulation panel 1. The recessed part 231 is a groove shape adapted to the width of the first joint. The recessed part 231 is installed in the first joint, and the opposite folded edge part 232 covers the stepped surface 13 of the adjacent prefabricated insulation panel 1. The fastener 24 passes through the bottom surface of the recessed part 231 and is connected to the top of the fastener 24 so that the folded edge part 232 is pressed against the stepped surface 13 of the prefabricated insulation panel 1. The joint insulation panel 3 is sealed and filled in the second joint of the prefabricated insulation panel 1.

[0060] In some embodiments, such as Figure 3 As shown, the liquid cargo tank insulation system also includes a protective layer 4 and a liquid-tight layer 5. The protective layer 4 is laid on the upper surface of the prefabricated insulation panel 1 and the joint insulation panel 3, with the edges of adjacent protective layers 4 overlapping. The protective layer 4 has a preset strength and a thickness typically of 1-2 mm. The materials of the protective layer 4 include polymer materials (such as thermoplastic polyolefin elastomer (TPO), which is made from polyolefin resins including but not limited to polypropylene (PP) or polyethylene (PE), fiberglass materials, and metal materials). It provides good mechanical protection and anti-aging protection. The liquid-tight layer 5 covers the joint of adjacent inner layers 11 and covers the fixing structure 2, and is pressed tightly by the joint insulation panel 3. The liquid-tight layer 5 may include fiberglass aluminum foil, carbon fiber aluminum foil, and composite materials, and its function is to form a liquid-tight layer on the joint, thereby acting as a splash barrier.

[0061] In some embodiments, in the structure of the prefabricated insulation panel 1, the outer layer 12 may consist of only a single layer of insulation, or it may include at least two layers of insulation stacked together. Similarly, the inner layer 11 may consist of only a single layer of insulation, or it may include at least two layers of insulation stacked together. Reinforcing layers may be provided between adjacent insulation layers and between the outer layer 12 and the inner layer 11. The reinforcing layers are generally planar mesh structures. The main material of the insulation layer includes, but is not limited to, polyurethane foam, polystyrene foam, polyethylene plastic, and phenolic foam, and may be reinforced with glass fiber, hollow glass microspheres, etc. The reinforcing layer may be composed of one or more mesh materials, such as glass fiber mesh, carbon fiber mesh, and metal mesh. The insulation layer and the reinforcing layer may be bonded together with low-temperature adhesive.

[0062] In some embodiments, the joint insulation board 3 may include an insulation body and an elastic insulation layer covering the surface of the insulation body. The insulation body may be a multi-layered structure, a single integral insulation structure, or it may be formed by alternating layers of insulation and reinforcing layers, similar to the layer structure of the prefabricated insulation board 1. The surface of the insulation body is covered with an elastic insulation layer to form an integral structure, thereby increasing the sealing effect of the joint. The elastic insulation layer may be made of materials including, but not limited to, glass wool, elastic cotton, aerogel felt, and polyethylene plastic.

[0063] In some embodiments, such as Figure 3 As shown, the surface of the liquid cargo tank 6 can be provided with several protruding structures 61. The prefabricated insulation board 1 is placed on the protruding structures 61, so that a leakage channel is formed between the prefabricated insulation board 1 and the outer wall of the liquid cargo tank 6. This facilitates the flow of the cryogenic liquid leaking from the liquid cargo tank 6 along the leakage channel to the bottom of the liquid cargo tank 6, so as not to accumulate in the prefabricated insulation board 1.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fixed structure for the insulation layer of a liquid cargo tank, characterized in that, The fixing structure (2) includes embedded parts (21), fixing rods (22), fixing plates (23) and fasteners (24); The embedded part (21) is pre-fixed on the outer surface of the liquid cargo tank (6), and the bottom end of the fixing rod (22) is connected to the embedded part (21); The fixing piece (23) includes a recess (231), a folded edge (232), and a limiting member (233). The recess (231) is a groove-shaped structure. The recess (231) is mounted on the top of the fixing rod (22), and the folded edge (232) is provided on both sides of the top of the recess (231). The two ends of the limiting member (233) are respectively connected to the two oppositely provided folded edges (232), and are used to limit the maximum separation distance between the two folded edges (232). The fastener (24) passes through the bottom surface of the recess (231) of the fixing plate (23) and connects to the top of the fixing rod (22); The limiting member (233) of the fixing structure (2) includes at least a first end and a second end. The ends of the first end and the second end of the limiting member (233) are bent 180° to the back side to form a limiting groove (2332). The limiting member (233) spans the recess (231) of the fixing piece (23), and the two opposite folded edges (232) of the fixing piece (23) are respectively inserted into the limiting grooves (2332) of the first end and the second end.

2. The liquid cargo tank insulation layer fixing structure according to claim 1, characterized in that, In the structure of the fixing piece (23), the angle between the side wall of the recess (231) and the folded edge (232) is less than 90°.

3. The liquid cargo tank insulation layer fixing structure according to claim 1, characterized in that, The fixing structure (2) also includes an elastic heat insulation bushing (25), which is sleeved on the outer wall of the fixing rod (22) to wrap the fixing rod (22).

4. The liquid cargo tank insulation layer fixing structure according to claim 1, characterized in that, The fixing structure (2) also includes an insulating filler (26), which is filled in the recess (231) of the fixing piece (23).

5. The liquid cargo tank insulation layer fixing structure according to claim 1, characterized in that, In the fixing piece (23), a reinforcing structure (234) is provided at the connection between the recessed part (231) and the folded edge part (232), and a reinforcing structure (234) is provided at the connection between the bottom surface and the side surface of the recessed part (231).

6. The liquid cargo tank insulation layer fixing structure according to claim 1, characterized in that, The edge of the folded portion (232) of the fixing piece (23) is provided with a downward-facing toothed structure (235).

7. A liquid cargo tank insulation system, characterized in that, include: If the prefabricated insulation panel (1) is laid on the outer surface of the liquid cargo tank (6) and spliced ​​to form a panel-type insulation layer; the prefabricated insulation panel (1) includes an inner layer (11) and an outer layer (12) attached to the upper surface of the inner layer (11); the side wall of the outer layer (12) is a predetermined distance from the side wall of the inner layer (11) to form a stepped surface (13) on the edge surface of the inner layer (11); wherein, the adjacent prefabricated insulation panels (1) include a first joint between adjacent inner layers (11) and a second joint between adjacent outer layers (12); Several fixing structures (2) as described in any one of claims 1 to 6 are provided in the first joint of adjacent prefabricated insulation panels (1), the embedded part (21) is pre-fixed to the outer surface of the liquid cargo tank (6) corresponding to the first joint, the bottom end of the fixing rod (22) is connected to the embedded part (21), the fixing rod (22) extends outward along the joint, and the top end of the fixing rod (22) is lower than the step surface (13) of the prefabricated insulation panel (1); the recess (231) is a groove shape adapted to the width of the first joint, the recess (231) is provided in the first joint, and the opposite folded edge (232) covers the step surface (13) of the adjacent prefabricated insulation panel (1); the fastener (24) passes through the bottom surface of the recess (231) and is connected to the top end of the fastener (24) so ​​that the folded edge (232) is pressed on the step surface (13) of the prefabricated insulation panel (1); The joint insulation board (3) is sealed and filled in the second joint of the prefabricated insulation board (1).

8. The liquid cargo tank insulation system according to claim 7, characterized in that, It also includes a protective layer (4) and a liquid-tight layer (5); The protective layer (4) is laid on the upper surface of the prefabricated insulation board (1) and the joint insulation board (3), and the edges of adjacent protective layers (4) are arranged in an overlapping manner. The liquid-tight layer (5) covers the joint of the adjacent inner layer (11) and covers the fixing structure (2), and is pressed by the joint insulation plate (3).

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