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

Abstract

The invention provides a liquid cargo tank heat insulation layer fixing structure and a liquid cargo tank heat insulation system.The liquid cargo tank heat insulation layer fixing structure comprises embedded parts, fixing rods, fixing pieces and fasteners; the 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 embedded part; the fixing piece comprises a downward concave part, an edge folding part and a limiting piece, and the downward concave part is of a groove-shaped structure. The downward concave part is lapped on the top of the fixing rod, and folding parts are arranged on two opposite sides of the top of the downward concave part; the two ends of the limiting piece are connected with the two oppositely-arranged edge folding parts correspondingly, and the limiting piece is at least used for limiting the maximum separation distance between the two edge folding parts. The fastener penetrates through the bottom face of the downward concave portion of the fixing piece and is connected with the top end of the fastener. According to the fixing structure, the maximum separation distance of the edge folding parts of the fixing pieces for pressing the prefabricated heat insulation plates is controlled, so that the separation deformation quantity is reduced, the deformation separation trend of the adjacent prefabricated heat insulation plates can be further inhibited, the cracking risk of plate joints is reduced, and the heat insulation effect is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of the design of the insulation system for the liquid cargo tank of a ship, and more specifically, to a fixing structure for the insulation layer of a liquid cargo tank and a liquid cargo tank insulation system. Background Art

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

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

[0004] However, when the liquid cargo tank is loaded with liquid cargo and the tank body undergoes low-temperature deformation, the gap between the prefabricated insulation boards undergoes more deformation than the prefabricated insulation boards. Since the existing fixing structure also undergoes deformation, the existing fixing strength is insufficient, and cracks are likely to occur in the gap between the boards. As a result, the heat insulation effect at the gap between adjacent prefabricated insulation boards becomes poor, the cold in the liquid cargo tank is dissipated from the gap, cold spots are formed at the positions where the cold is dissipated, and further damage to the insulation system is aggravated, and the insulation effect is further reduced. Summary of the Invention

[0005] The purpose of the present application is to provide a fixing structure for the insulation layer of a liquid cargo tank and a liquid cargo tank insulation system. Among them, the maximum separation distance of the folded edge part of the fixing piece for pressing the prefabricated insulation board by the fixing structure is controlled, so the separation deformation amount is reduced, the deformation separation trend of adjacent prefabricated insulation boards can be further inhibited, the risk of crack opening at the board gap is reduced, and the heat insulation effect is ensured.

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

[0007] In an implementable solution, the limiting piece of the fixing structure is a long strip-shaped structure, the limiting piece straddles the concave part, and both ends of it are respectively fixedly connected to the folded edge parts on both sides.

[0008] In an implementable solution, the number of the limiting members is two, which are arranged in parallel and expose the middle area of the concave portion.

[0009] In an implementable solution, the number of the limiting members is one, which spans across the middle position of the concave portion, and an opening for a fastener to pass through is provided in the middle of the limiting member.

[0010] In an implementable solution, the limiting member of the fixing structure is a cross-shaped sheet structure, the cross-shaped sheet structure includes a first extension direction and a second extension direction, the structure in the first extension direction covers the top opening of the concave portion, both ends in the second extension direction are fixedly connected to the flanging portions on both sides respectively, and an opening for a fastener to pass through is provided in the middle of the limiting member.

[0011] In an implementable solution, the limiting member of the fixing structure is a square sheet structure, which covers the top opening and the flanging portion of the concave portion, and the limiting member in the shape of a square sheet is fixedly connected to the flanging portion, and an opening for a fastener to pass through is provided in the middle of the limiting member.

[0012] In an implementable solution, the limiting member of the fixing structure at least includes opposite first end and second end, the ends of the first end and the second end of the limiting member are bent backward by more than 90° to form a limiting groove, the limiting member spans across the concave portion of the fixing sheet, and the two opposite flanging portions of the fixing sheet are respectively inserted into the limiting grooves of the first end and the second end.

[0013] In an implementable solution, the ends of the first end and the second end of the limiting member are bent backward by 180° to form a limiting groove.

[0014] In an implementable solution, in the structure of the fixing sheet, the included angle between the side wall of the concave portion and the flanging portion is less than 90°.

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

[0016] In an implementable solution, the fixing structure further includes a heat-insulating filling block, which is filled in the concave portion of the fixing sheet.

[0017] In an implementable solution, in the fixing sheet, a reinforcing structure is provided at the connection between the concave portion and the flanging portion, and a reinforcing structure is provided at the connection between the bottom surface and the side surface of the concave portion.

[0018] In an implementable solution, a downward tooth-shaped structure is provided at the edge of the flanging portion of the fixing sheet.

[0019] In a second aspect, a liquid cargo tank thermal insulation system is further provided, which includes prefabricated thermal insulation panels, the aforementioned fixing structure, and joint thermal insulation panels. A plurality of prefabricated thermal insulation panels are laid on the outer surface of the liquid cargo tank and joined together to form a plate-type thermal insulation layer; the prefabricated thermal insulation panel includes an inner layer and an outer layer attached to the upper surface of the inner layer; the side wall of the outer layer is at a predetermined distance from the side wall of the inner layer to form a stepped surface on the surface of the edge of the inner layer; wherein, between adjacent prefabricated thermal insulation panels, there are a first joint between adjacent inner layers and a second joint between adjacent outer layers. A plurality of fixing structures are arranged in the first joint of adjacent prefabricated thermal insulation panels, the embedded part is pre-fixed on the outer surface of the liquid cargo tank corresponding to the first joint, the bottom end of the fixing rod is connected to the embedded part, the fixing rod extends outward along the plate joint, and the top end of the fixing rod is lower than the stepped surface of the prefabricated thermal insulation panel; the concave part is a groove type adapted to the width of the first joint, the concave part is arranged in the first joint, and the opposite folded edge parts cover the stepped surfaces of adjacent prefabricated thermal insulation panels; the fastener passes through the bottom surface of the concave part and is connected to the top end of the fastener, so that the folded edge part is pressed against the stepped surface of the prefabricated thermal insulation panel. The joint thermal insulation panel is hermetically filled in the second joint of the prefabricated thermal insulation panel.

[0020] In an implementable solution, the liquid cargo tank thermal insulation system further includes a protective layer and a liquid-tight layer; the protective layer is laid on the upper surfaces of the prefabricated thermal insulation panels and the joint thermal insulation panels, and the edges of adjacent protective layers are arranged in an overlapping manner; the liquid-tight layer covers the joints of adjacent inner layers, covers the fixing structure, and is pressed by the joint thermal insulation panel.

[0021] Compared with the prior art, the beneficial effects of the present application at least include: when the liquid cargo tank is loaded with liquid cargo and the tank body undergoes low-temperature deformation, the prefabricated thermal insulation panel undergoes a certain degree of deformation, resulting in an expanding trend of the plate joints between the prefabricated thermal insulation panels. However, in the fixing structure of the present application, the folded edge parts pressing the stepped surface are restricted by the limiting parts, so the two opposite folded edge parts cannot continue to separate, that is, the separation deformation generated by the fixing piece is effectively controlled. Furthermore, the separation trend of the stepped surface pressed by the folded edge parts can be inhibited, thereby to a certain extent reducing the expanding trend of the plate joints between adjacent prefabricated thermal insulation panels, reducing the risk of cracking of the seal at the plate joints, improving the heat insulation effect at the plate joints, reducing the loss of cold energy, avoiding the formation of cold spots, and ensuring the thermal insulation effect. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Schematic diagram of the assembled state of a prefabricated thermal insulation panel shown in an embodiment of the present application;

[0024] Figure 2 Explosion structure schematic diagram of a fixing structure shown in the embodiment of the present application;

[0025] Figure 3 Partial structure cross-sectional view schematic diagram of a liquid cargo tank thermal insulation system shown in the embodiment of the present application;

[0026] Figure 4 is Figure 3 Explosion structure schematic diagram of the fixing structure in

[0027] Figure 5 Schematic diagram of the structure of the first fixing piece shown in the embodiment of the present application;

[0028] Figure 6 Schematic diagram of the structure of the second fixing piece shown in the embodiment of the present application;

[0029] Figure 7 Schematic diagram of the structure of the third fixing piece shown in the embodiment of the present application;

[0030] Figure 8 Schematic diagram of the structure of the fourth fixing piece shown in the embodiment of the present application;

[0031] Figure 9 Schematic diagram of the structure of a limiting member shown in the embodiment of the present application;

[0032] Figure 10 Schematic diagram of the structure of the fifth fixing piece shown in the embodiment of the present application;

[0033] Figure 11 is Figure 10 Side view of the fixing piece in

[0034] Figure 12 Schematic diagram of the structure of a fixing piece with a strengthening structure shown in the embodiment of the present application.

[0035] In the figure: 1, prefabricated thermal insulation board; 11, inner layer; 12, outer layer; 13, stepped surface; 2, fixing structure; 21, embedded part; 22, fixing rod; 23, fixing piece; 231, concave part; 2311, through hole; 232, folded edge part; 233, limiting member; 2331, opening; 2332, limiting groove; 234, strengthening structure; 235, tooth-shaped structure; 24, fastener; 25, elastic thermal insulation bushing; 26, thermal insulation filling block; 3, joint thermal insulation board; 4, protective layer; 5, liquid-tight layer; 6, liquid cargo tank; 61, convex structure. Detailed implementation manners

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. Usually, the components of the embodiments of this application described and illustrated in the accompanying drawings here can 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 this application claimed, but merely represents selected embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts belong to the scope of protection of this application.

[0038] As Figure 1 shown in the top view of the partial structure of the cargo tank thermal insulation layer, the cargo tank thermal insulation layer includes a plurality of prefabricated thermal insulation boards 1 laid on the surface of the liquid cargo tank. A stepped surface 13 is formed at the side wall of the prefabricated thermal insulation board 1, and a board gap is formed between adjacent prefabricated thermal insulation boards 1. The fixing structure 2 is disposed in the board gap.

[0039] As Figure 2 shown, the embodiments of this application first provide a fixing structure for a cargo tank thermal insulation layer. The fixing structure 2 includes an embedded part 21, a fixing rod 22, a fixing piece 23, and a fastener 24. Among them, 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.

[0040] The fixing piece 23 includes a concave part 231, a folded edge part 232, and a limiting part 233. The concave part 231 is a groove-shaped structure, and its width is adapted to the board gap between adjacent prefabricated thermal insulation boards 1. The concave part 231 is placed on the top of the fixing rod 22, and folded edge parts 232 are arranged on the two opposite sides of the top of the concave part 231. Both ends of the limiting part 233 are connected to the two relatively arranged folded edge parts 232, and are at least used to limit the maximum separation distance between the two folded edge parts 232. A through hole 2311 is provided on the bottom surface of the concave part 231 of the fixing piece 23. The fastener 24 passes through the through hole 2311 on the bottom surface of the concave part 231 and is connected to the top end of the fastener 24, so that the fixing piece 23 is tightly connected to the fixing rod 22, and the folded edge part 232 of the fixing piece 23 is pressed against the stepped surface 13 of the prefabricated thermal insulation board 1.

[0041] When the liquid cargo tank is loaded with liquid cargo and the tank body undergoes low-temperature deformation, the prefabricated heat insulation board 1 undergoes a certain degree of deformation, resulting in an expanding trend of the gaps between the prefabricated heat insulation boards 1. However, in the fixing structure 2, the folded edge portion 232 of the pressing step surface 13 is restricted by the limiting member 233, so the two opposite folded edge portions 232 cannot continue to separate, that is, the separation deformation generated by the fixing piece 23 is effectively controlled. Furthermore, the separation trend of the step surface 13 pressed by the folded edge portion 232 can be suppressed, thereby reducing the expanding trend of the gaps between adjacent prefabricated heat insulation boards 1 to a certain extent, reducing the cracking risk of the seal at the gaps, improving the heat insulation effect at the gaps, reducing the loss of cold energy, avoiding the formation of cold spots, and ensuring the heat insulation effect.

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

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

[0044] In some embodiments, such as Figure 3 and Figure 4 shown, the fixing structure 2 can further include an elastic heat insulation bushing 25 and a heat insulation filling block 26. The elastic heat insulation bushing 25 is sleeved on the outer wall of the fixing rod 22 to wrap the fixing rod 22, and the heat insulation filling block 26 is filled in the concave portion 231 of the fixing piece 23. The materials of the elastic heat insulation bushing 25 and the heat insulation filling block 26 include but not limited to glass wool, elastic cotton, aerogel felt, polyethylene plastic, etc., and the function is to fill the gaps and maintain a good heat insulation effect. In addition, a filler layer (not shown in the figure) can be further provided between the heat insulation filling block 26 and the fastener 24, and its materials include but not limited to low-temperature glue, silica gel, epoxy resin glue, etc., to further enhance the sealing and heat insulation effects.

[0045] In some embodiments, such as Figure 5 and Figure 6 shown, the limiting member 233 of the fixing structure 2 can be a long strip-shaped structure, the limiting member 233 straddles the concave portion 231, and its two ends are respectively fixedly connected to the folded edge portions 232 on both sides, such as by welding or connection through fasteners, or by snap connection.

[0046] For example, as Figure 5 shown, the number of the limiting members 233 is two, arranged in parallel, and the middle area of the concave portion 231 is exposed.

[0047] For example, asFigure 6 As shown, the number of the limiting members 233 is one, spanning across the middle position of the lower concave portion 231, and an opening 2331 for the fastener 24 to pass through is provided in the middle of the limiting member 233.

[0048] In some embodiments, as Figure 7 shown, the limiting member 233 of the fixing structure 2 may 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 lower concave portion 231, and both ends in the second extending direction are respectively connected to the flanging portions 232 on both sides. An opening 2331 for the fastener 24 to pass through is provided in the middle of the limiting member 233.

[0049] In some embodiments, as Figure 8 shown, the limiting member 233 of the fixing structure 2 is a square sheet structure, covering the top opening of the lower concave portion 231 and the flanging portion 232, and the limiting member 233 in the shape of a square sheet is connected to the flanging 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, as Figure 9 and Figure 10 shown, the limiting member 233 of the fixing structure 2 at least includes opposite first and second ends. The ends of the first and second ends of the limiting member 233 are bent backward by more than 90° to form a limiting groove 2332. The limiting member 233 spans across the lower concave portion 231 of the fixing piece 23, and the two opposite flanging portions 232 of the fixing piece 23 are respectively inserted into the limiting grooves 2332 at the first end and the second end.

[0051] In addition, as the limiting member 233 shown in Figure 6 , Figure 7 and Figure 8 , limiting grooves 2332 may also be formed at both ends thereof, and are in plug-in fit with the flanging portions 232.

[0052] In this embodiment, since the two ends of the limiting member 233 are formed with limiting grooves 2332 and are inserted and cooperated with the folded edge portions 232, the maximum separable distance between the two folded edge portions 232 is restricted. Thus, the separation tendency of the stepped surface 13 pressed by the folded edge portions 232 can be inhibited, so that the expansion tendency of the seam between adjacent prefabricated insulation boards 1 can be reduced to a certain extent, the cracking risk of the seal at the seam can be reduced, and the heat insulation effect at the seam can be improved. Moreover, if the prefabricated insulation board 1 expands to a certain extent when the temperature rises, since the limiting grooves 2332 only restrict 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 extrusion of adjacent prefabricated insulation boards 1 at this time. It can be seen from this that the structure in which the limiting grooves 2332 at both ends of the limiting member 233 are inserted and cooperated with the folded edge portions 232 can restrict the maximum separable distance between the two folded edge portions 232 and enable the two folded edge portions 232 to have the deformation ability to approach each other at the same time.

[0053] In some embodiments, as Figure 11 shown, the end portions of the first end and the second end of the limiting member 233 can be bent 180° toward the back side to form the limiting grooves 2332.

[0054] In some embodiments, as Figure 11 shown, in the structure of the fixing piece 23, the included angle between the side wall of the concave portion 231 and the folded edge portion 232 is preferably less than 90°, so that the folded edge portion 232 has a downward inclination form, so that its fit and pressing with the stepped surface 13 are more firm, and at the same time, a part of the deformation force generated by the deformation of the liquid cargo tank 6 can be offset.

[0055] In some embodiments, as Figure 12 shown, the edge portion of the folded edge portion 232 of the fixing piece 23 can be provided with a downward tooth-shaped structure 235 to better inhibit the expansion of the seam and improve the fixing stability.

[0056] In some embodiments, as Figure 12 shown, in the fixing piece 23, a reinforcing structure 234 can be provided at the connection between the concave 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 concave portion 231. Among them, a concave mark can be pressed at the corner as the reinforcing structure 234, or a strip-shaped groove structure can be pressed at the connection as the reinforcing structure 234, etc.

[0057] As Figure 3 shown, the embodiment of the present application further provides a liquid cargo tank heat insulation system, including a plurality of prefabricated insulation boards 1, a plurality of the foregoing fixing structures 2, and a joint insulation board 3.

[0058] A number of prefabricated thermal insulation boards 1 are laid on the outer surface of the liquid cargo tank 6 and are joined together to form a plate-type thermal insulation layer. The prefabricated thermal insulation board 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 at 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, between adjacent prefabricated thermal insulation boards 1, there are a first joint between adjacent inner layers 11 and a second joint between adjacent outer layers 12.

[0059] A number of fixing structures 2 are arranged in the first joints of adjacent prefabricated thermal insulation boards 1. The embedded part 21 is pre-fixed on 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 plate joint, and the top end of the fixing rod 22 is lower than the stepped surface 13 of the prefabricated thermal insulation board 1; the concave part 231 is a groove type adapted to the width of the first joint. The concave part 231 is arranged in the first joint, and the opposite folded edge parts 232 cover the stepped surfaces 13 of adjacent prefabricated thermal insulation boards 1; the fastener 24 passes through the bottom surface of the concave part 231 and is connected to the top end of the fastener 24 to press the folded edge part 232 against the stepped surface 13 of the prefabricated thermal insulation board 1. The joint thermal insulation board 3 is hermetically filled in the second joint of the prefabricated thermal insulation board 1.

[0060] In some embodiments, as Figure 3 shown, the liquid cargo tank thermal insulation system further includes a protective layer 4 and a liquid-tight layer 5. The protective layer 4 is laid on the upper surfaces of the prefabricated thermal insulation board 1 and the joint thermal insulation board 3, and the edges of adjacent protective layers 4 are arranged in an overlapping manner. Among them, the protective layer 4 has a preset strength and a thickness generally of 1-2 millimeters. The material of the protective layer 4 includes polymer materials (such as thermoplastic polyolefin elastomer (TPO), and TPO is composed of polyolefin resins including but not limited to polypropylene (PP) or polyethylene (PE), etc.), fiberglass materials, and metal materials, etc., which can provide good mechanical protection and anti-aging protection. The liquid-tight layer 5 covers the joints of adjacent inner layers 11 and covers the fixing structure 2, and is pressed by the joint thermal insulation board 3. The liquid-tight layer 5 can include fiberglass aluminum foil cloth, carbon fiber aluminum foil cloth, and composite materials, and its function is to form a liquid-tight layer on the joint, thereby acting as a splash-proof barrier.

[0061] In some embodiments, in the structure of the prefabricated insulation panel 1, the outer layer 12 may include only a single layer of insulation layer, or may include at least two mutually stacked insulation layers. Similarly, the inner layer 11 may include only a single layer of insulation layer, or may include at least two mutually stacked insulation layers. A reinforcing layer may be provided between adjacent insulation layers and between the outer layer 12 and the inner layer 11, and the reinforcing layer is generally a planar grid structure. Among them, the main materials of the insulation layer include but are not limited to polyurethane foam, polystyrene foam, polyethylene plastic, phenolic foam, etc., and can be reinforced with glass fiber, hollow glass microspheres, etc. The reinforcing layer may be composed of one or more grid materials, and the grid materials may be glass fiber mesh cloth, carbon fiber mesh cloth, metal mesh, etc. The insulation layer and the reinforcing layer can be bonded by low-temperature glue.

[0062] In some embodiments, the joint insulation panel 3 may include an insulation main body and an elastic insulation layer covering the surface of the insulation main body. The insulation main body may be a multi-layer stacked structure, the insulation main body may be an integral insulation structure, or may also be formed by alternately stacking insulation layers and reinforcing layers, similar to the layer structure of the prefabricated insulation panel 1. The surface of the insulation main body is covered with an elastic insulation layer to form an integral structure for enhancing the joint sealing effect. The elastic insulation layer may include but is not limited to glass wool, elastic cotton, aerogel felt, polyethylene plastic, etc.

[0063] In some embodiments, as Figure 3 shown, a number of convex structures 61 may be provided on the surface of the liquid cargo tank 6, and the prefabricated insulation panel 1 is placed on the convex structures 61, so that a leakage channel is formed between the prefabricated insulation panel 1 and the outer wall of the liquid cargo tank 6, facilitating the diversion of the cryogenic liquid leaking from the liquid cargo tank 6 along the leakage channel to the bottom of the liquid cargo tank 6, rather than accumulating in the prefabricated insulation panel 1.

[0064] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An insulating layer fixing structure for a liquid cargo tank, characterized in that, 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 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 concave part (231), a flanging part (232) and a limiting part (233). The concave part (231) is a groove-shaped structure; the concave part (231) is placed on the top of the fixing rod (22), and the flanging parts (232) are arranged on the two opposite sides of the top of the concave part (231); both ends of the limiting part (233) are respectively connected to the two relatively arranged flanging parts (232), and at least used to limit the maximum separation distance between the two flanging parts (232); The fastener (24) passes through the bottom surface of the concave part (231) of the fixing piece (23) and is connected to the top end of the fastener (24).

2. The fixed structure of the insulation layer of the liquid cargo tank according to claim 1, characterized in that The limiting part (233) of the fixing structure (2) is a long strip-shaped sheet structure. The limiting part (233) straddles the concave part (231), and both ends of it are respectively fixedly connected to the flanging parts (232) on both sides.

3. The fixed structure of the cargo tank thermal insulation layer according to claim 2, wherein, The number of the limiting parts (233) is two, which are arranged in parallel and expose the middle area of the concave part (231).

4. The fixed structure of the cargo tank thermal insulation layer according to claim 2, characterized in that, The number of the limiting parts (233) is one, which straddles the middle position of the concave part (231), and an opening (2331) for the fastener (24) to pass through is arranged in the middle of the limiting part (233).

5. The fixed structure of the liquid cargo tank thermal insulation layer according to claim 1, wherein The limiting part (233) of the fixing structure (2) is a cross-shaped sheet structure. The cross-shaped sheet structure includes a first extension direction and a second extension direction. The structure in the first extension direction covers the top opening of the concave part (231), and both ends of the structure in the second extension direction are respectively fixedly connected to the flanging parts (232) on both sides, and an opening (2331) for the fastener (24) to pass through is arranged in the middle of the limiting part (233).

6. The fixed structure of the insulation layer of the liquid cargo tank according to claim 1, characterized in that, The limiting part (233) of the fixing structure (2) is a square sheet structure, which covers the top opening of the concave part (231) and the flanging part (232), and the limiting part (233) in the shape of a square sheet is fixedly connected to the flanging part (232), and an opening (2331) for the fastener (24) to pass through is arranged in the middle of the limiting part (233).

7. The fixed structure of the insulation layer of the liquid cargo tank according to claim 1, characterized in that, The limiting part (233) of the fixing structure (2) at least includes an opposite first end and a second end. The end parts of the first end and the second end of the limiting part (233) are bent backward by more than 90° to form a limiting groove (2332). The limiting part (233) straddles the concave part (231) of the fixing piece (23), and the two relatively arranged flanging parts (232) of the fixing piece (23) are respectively inserted into the limiting grooves (2332) at the first end and the second end.

8. The fixed structure of the insulation layer of the liquid cargo tank according to claim 7, characterized in that, The end parts of the first end and the second end of the limiting part (233) are bent backward by 180° to form the limiting groove (2332).

9. The fixed structure of the insulation layer of the liquid cargo tank according to any one of claims 1 to 8, characterized in that, In the structure of the fixing piece (23), the included angle between the side wall of the concave part (231) and the folded edge part (232) is less than 90°.

10. The fixed structure of the insulation layer of the liquid cargo tank according to claim 1, characterized in that, The fixing structure (2) further includes an elastic heat-insulating bushing (25) sleeved on the outer wall of the fixing rod (22) to wrap the fixing rod (22).

11. The fixed structure of the insulation layer of the liquid cargo tank according to claim 1, characterized in that, The fixing structure (2) further includes a heat-insulating filling block (26) filled in the concave part (231) of the fixing piece (23).

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

13. The fixed structure of the insulation layer of the liquid cargo tank according to claim 1, characterized in that, A downward tooth-shaped structure (235) is provided at the edge of the folded edge part (232) of the fixing piece (23).

14. A liquid cargo tank insulation system, characterized in that, Comprising: A plurality of prefabricated heat-insulating boards (1) laid on the outer surface of the liquid cargo tank (6) and spliced to form a plate-type heat-insulating layer; the prefabricated heat-insulating board (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 at a predetermined distance from the side wall of the inner layer (11) to form a stepped surface (13) on the surface of the edge of the inner layer (11); wherein, between adjacent prefabricated heat-insulating boards (1) there are a first joint between adjacent inner layers (11) and a second joint between adjacent outer layers (12); A plurality of fixing structures (2) as described in any one of claims 1 to 13 are arranged in the first joint of adjacent prefabricated heat-insulating boards (1), the embedded part (21) is pre-fixed on 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 plate joint, and the top end of the fixing rod (22) is lower than the stepped surface (13) of the prefabricated heat-insulating board (1); the concave part (231) is a groove type adapted to the width of the first joint, the concave part (231) is arranged in the first joint, and the opposite folded edge parts (232) are covered on the stepped surfaces (13) of adjacent prefabricated heat-insulating boards (1); the fastener (24) passes through the bottom surface of the concave part (231) and is connected to the top end of the fastener (24) to press the folded edge part (232) against the stepped surface (13) of the prefabricated heat-insulating board (1); A joint heat-insulating board (3) hermetically filled in the second joint of the prefabricated heat-insulating board (1).

15. The cargo tank insulation system according to claim 14, characterized in that, Further comprising a protective layer (4) and a liquid-tight layer (5); The protective layer (4) is laid on the upper surfaces of the prefabricated heat-insulating board (1) and the joint heat-insulating 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 adjacent inner layers (11), covers the fixing structure (2), and is pressed by the joint heat-insulating board (3).

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