Film enclosure structure and liquid cargo tank enclosure system

Abstract

The invention relates to the technical field of storage and transportation equipment, in particular to a thin film enclosure structure and a liquid cargo tank enclosure system. The heat insulation piece layer is arranged on the side, back on to the wave protrusions, of the sealing film layer. And the reinforcing piece is arranged between the sealing film layer and the heat insulation piece layer, is connected to the heat insulation piece layer and extends into the wavy bulges formed by the sealing film layer. The wave protrusion structures can conduct self-contraction deformation to release stress when bearing deformation stress so as to maintain the stability of the whole structure, the reinforcing pieces can prevent the wave protrusions from generating large deformation, displacement and twisting deformation of the wave protrusions are prevented, and the service life of the whole structure is prolonged. And the supporting effect can still be effectively achieved under the condition that asymmetric stress exists in the liquid cargo tank containment system, the influence of various stress sources on the sealing thin film layer is relieved, the overall structural stability of the thin film type containment system is improved, and it is guaranteed that the good sealing effect and safety can be maintained under various operation conditions and external influences.

Description

Technical Field

[0001] The present invention relates to the technical field of storage and transportation equipment, and in particular to a film enclosure structure and a liquid cargo tank enclosure system. Background Art

[0002] In the design and construction of LNG ships, the liquid cargo tank containment system plays a vital role. The liquid cargo containment system is used to store LNG cargo with a temperature of -162°C. It is not only directly related to the safe operation of the ship, but also affects the effective use of energy. It is the isolation barrier and thermal insulation system of the liquid cargo tank. The liquid cargo tank containment system is mainly divided into two categories: self-supporting type and membrane type. Among them, the membrane type containment system generally uses corrugated sealing membrane for containment.

[0003] In the actual application of film-type containment systems, when the corrugated sealing membrane faces various stress sources (such as the thermal shrinkage effect during tank cooling, the direct deformation pressure of the tank body caused by the bending of the ship beam, and the dynamic load caused by the sloshing of the liquid in the tank), since the corrugated sealing membrane has no independent supporting structure, under the action of various stress sources, its corrugated grooves are prone to large deformation, resulting in displacement and torsional deformation of the corrugations, which reduces the overall structural stability of the film-type containment system and affects the sealing effect and safety. Summary of the invention

[0004] The present invention provides a film containment structure and a liquid cargo tank containment system, which are used to solve the defect in the prior art that the corrugated sealing film is prone to large deformation when facing various stress sources, and can alleviate the influence of various stress sources on the corrugated sealing film, improve the overall structural stability of the film type containment system, and ensure that good sealing effect and safety can be maintained under various operating conditions and external influences.

[0005] The present invention provides a film enclosure structure, comprising a sealing film layer, an insulating layer and a reinforcing member, wherein a plurality of wave protrusions are formed on the surface of one side of the sealing film layer; the insulating layer is arranged on the side of the sealing film layer facing away from the wave protrusions; the reinforcing member is arranged between the sealing film layer and the insulating layer, the reinforcing member is connected to the insulating layer, and extends into the wave protrusions formed by the sealing film layer.

[0006] According to a film enclosure structure provided by the present invention, a gap is formed between the edge of the reinforcement and the inner wall of the wave protrusion.

[0007] According to a film enclosure structure provided by the present invention, the plurality of wave protrusions include a plurality of first protrusions arranged in parallel along a first direction and a plurality of second protrusions arranged in parallel along a second direction, the first direction and the second direction are perpendicular so that the first protrusions and the second protrusions intersect and are connected, and a plurality of the reinforcements are arranged in each of the first protrusions and each of the second protrusions, and the plurality of the reinforcements are evenly spaced.

[0008] According to a film enclosure structure provided by the present invention, the intersection of the first protrusion and the second protrusion forms a node, the first protrusion and the second protrusion intersect at the node to form a cross-shaped corrugated channel, and the reinforcement is symmetrically distributed near the node in the cross-shaped corrugated channel.

[0009] According to a thin film enclosure structure provided by the present invention, a gas flow channel is formed on the reinforcement member, and the gas flow channels on two adjacent reinforcement members in the first convex portion and the second convex portion are staggered.

[0010] According to a thin film enclosure structure provided by the present invention, the reinforcement member includes a connecting portion, a supporting arch portion and reinforcing ribs, wherein the connecting portion is used to connect the thermal insulation layer; the supporting arch portion is connected to the connecting portion, the supporting arch portion is located in the wave bulge, and is formed into a shape identical to the cross-section of the inner wall of the wave bulge; the reinforcing ribs are located in the space enclosed by the connecting portion and the supporting arch portion, and a plurality of the reinforcing ribs are cross-arranged to form a plurality of gas circulation channels.

[0011] According to a film enclosure structure provided by the present invention, the reinforcement member includes an X-shaped reinforcement member and a Y-shaped reinforcement member, the reinforcement ribs in the X-shaped reinforcement member are arranged in an X-shape or a cross shape, and the reinforcement ribs in the Y-shaped reinforcement member are arranged in a Y-shape.

[0012] According to a film enclosure structure provided by the present invention, the insulation layer includes a plywood and a polyurethane layer, wherein the plywood is arranged on the side of the sealing film layer facing away from the wave protrusion, and the reinforcement is connected to the plywood; the polyurethane layer is adhered to the side of the plywood facing away from the sealing film layer.

[0013] According to a film enclosure structure provided by the present invention, a base is provided at the end of the reinforcement member close to the plywood, and the base is detachably connected to the plywood via a connecting member.

[0014] According to a film enclosure structure provided by the present invention, a connecting groove is formed on the plywood, and the reinforcing member forms a structure adapted to the connecting groove near the end of the plywood. The reinforcing member is clamped in the connecting groove on the plywood, and the clamping point is filled with low-temperature glue.

[0015] According to a film enclosure structure provided by the present invention, the end of the reinforcement member close to the plywood is fixed to the surface of the plywood by means of low-temperature adhesive.

[0016] The present invention also provides a liquid cargo tank containment system, comprising the film containment structure described in any one of the above items, wherein the film containment structure encloses a liquid cargo tank body, a sealing film layer of the film containment structure is located inside the liquid cargo tank body, and is used to contact the stored fluid in the liquid cargo tank body, and an insulating layer of the film containment structure is located outside the liquid cargo tank body, and is used to isolate the heat exchange between the stored fluid in the sealing film layer and the external environment.

[0017] The film enclosure structure and liquid cargo tank enclosure system provided by the present invention are characterized in that a sealing film layer is formed with a plurality of wave protrusions. When the film-type liquid cargo tank enclosure system is manufactured, one side of the wave protrusion of the sealing film layer is in contact with the liquid. The wave structure of the wave protrusion can self-contract and deform to release the stress when subjected to deformation stress, so as to maintain the stability of the overall structure; the thermal insulation layer is used to isolate the heat exchange between the liquid inside the sealing film layer and the external environment; a reinforcement member is arranged between the sealing film layer and the thermal insulation layer, and the reinforcement member can prevent the wave protrusion from undergoing large deformation, prevent the displacement and torsional deformation of the wave protrusion, and can still effectively realize the supporting effect when asymmetric stress exists in the liquid cargo tank enclosure system, alleviate the influence of various stress sources on the sealing film layer, improve the overall structural stability of the film-type enclosure system, and ensure that good sealing effect and safety can be maintained under various operating conditions and external influences. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the axonometric structure of the film enclosure structure provided by the present invention.

[0020] Figure 2 It is a schematic diagram of the explosion structure of the film enclosure structure provided by the present invention.

[0021] Figure 3This is a structural view of the positive layer of the film enclosure structure provided by the present invention.

[0022] Figure 4 This is one of the schematic diagrams of the assembly structure of the sealing film layer and the reinforcement member provided by the present invention.

[0023] Figure 5 This is the second schematic diagram of the assembly structure of the sealing film layer and the reinforcement member provided by the present invention.

[0024] Figure 6 This is one of the structural schematic diagrams of the X-shaped reinforcement provided by the present invention.

[0025] Figure 7 This is the second structural schematic diagram of the X-shaped reinforcement provided by the present invention.

[0026] Figure 8 It is one of the structural schematic diagrams of the Y-shaped reinforcement provided by the present invention.

[0027] Fig. 9 This is the second structural schematic diagram of the Y-shaped reinforcement provided by the present invention.

[0028] Fig.10 It is a schematic structural diagram of a reinforcing member provided by the present invention that can be used for clamping plywood.

[0029] Figure numerals: 1. Sealing film layer; 11. Wave protrusion; 111. First protrusion; 112. Second protrusion; 2. Insulation layer; 21. Plywood; 22. Polyurethane layer; 3. Reinforcement; 31. Gas circulation channel; 32. Connection part; 33. Support arch; 34. Reinforcement rib. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0033] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] Combine the following Figures 1 to 10 The specific structure and implementation principle of the membrane containment structure and liquid cargo tank containment system of the present invention are described.

[0036] One embodiment of the present invention provides a thin film enclosure structure, combined with Figure 1 and Figure 2 As shown, the film enclosure structure includes a sealing film layer 1, an insulating layer 2 and a reinforcing member 3, wherein a plurality of wavy protrusions 11 are formed on the surface of one side of the sealing film layer 1; the insulating layer 2 is arranged on the side of the sealing film layer 1 facing away from the wavy protrusions 11; the reinforcing member 3 is arranged between the sealing film layer 1 and the insulating layer 2, the reinforcing member 3 is connected to the insulating layer 2, and extends into the wavy protrusions 11 formed by the sealing film layer 1.

[0037] It can be understood that the film enclosure structure of the present embodiment can be used to manufacture a film-type liquid cargo tank enclosure system, wherein the sealing film layer 1 is formed with a plurality of wave protrusions 11. When manufacturing the film-type liquid cargo tank enclosure system, one side of the wave protrusion 11 of the sealing film layer 1 is in contact with the liquid. The wave structure of the wave protrusion 11 can self-contract and deform to release the stress when subjected to deformation stress, so as to maintain the stability of the overall structure; the insulation layer 2 is used to isolate the heat exchange between the liquid inside the sealing film layer 1 and the external environment; a reinforcement 3 is arranged between the sealing film layer 1 and the insulation layer 2, and the reinforcement 3 can prevent the wave protrusion 11 from undergoing large deformation, prevent the displacement and torsional deformation of the wave protrusion 11, and can still effectively realize the supporting role when there is asymmetric stress in the liquid cargo tank enclosure system, alleviate the influence of various stress sources on the sealing film layer 1, improve the overall structural stability of the film-type enclosure system, and ensure that good sealing effect and safety can be maintained under various operating conditions and external influences.

[0038] It should be understood that the membrane enclosure structure of this embodiment can be used in the liquid cargo tank enclosure system of LNG ships, and can also be applied to onshore membrane storage tanks.

[0039] In some embodiments of the membrane enclosure of the present invention, see Figure 3As shown, a gap is formed between the edge of the reinforcement 3 and the inner wall of the wave protrusion 11. It can be understood that the width of the reinforcement 3 structure is smaller than the width of the groove formed by the wave protrusion 11, so that the reinforcement 3 can be placed in the wave protrusion 11 without hindering the temperature shrinkage and small deformation of the wave protrusion 11. The supporting function of the reinforcement 3 is mainly to prevent the large deformation of the corrugation, and to prevent the displacement and torsional deformation of the corrugation, and can still achieve the supporting function in the presence of asymmetric stress. The gap between the reinforcement 3 and the wave protrusion 11 ensures that the reinforcement 3 will not cause stress concentration or hinder the natural small deformation of the wave protrusion 11 due to direct contact with the inner wall of the wave protrusion 11, thereby protecting the sealing film layer 1 from damage. By retaining the gap, the wave protrusion 11 can self-contract and deform to release stress when subjected to deformation stress, maintaining the stability of the overall structure. Only when the wave protrusion 11 undergoes large deformation or displacement and torsional deformation, the reinforcement 3 supports the sealing film layer 1.

[0040] The reinforcement member 3 can be made of many materials, such as metal, plastic or other composite materials. Metal materials such as aluminum alloy, titanium alloy and other alloys with high strength are used; plastic materials such as polyethylene, polypropylene, polycarbonate, polyetherimide, polymethyl methacrylate (PMMA), polyvinyl chloride (PVC) and the like are used; composite materials containing fibers, such as high-strength carbon fiber materials, glass fibers bonded with plastic resins and the like can also be used. Preferably, the reinforcement member 3 should be made of a material with a low friction coefficient.

[0041] In some embodiments of the membrane enclosure of the present invention, see Figure 1 As shown, the multiple wave protrusions 11 include a plurality of first protrusions 111 arranged in parallel along a first direction and a plurality of second protrusions 112 arranged in parallel along a second direction, the first direction and the second direction are perpendicular so that the first protrusions 111 and the second protrusions 112 intersect and are connected, and a plurality of reinforcements 3 are arranged in each first protrusion 111 and each second protrusion 112, and the plurality of reinforcements 3 are evenly spaced.

[0042] It is understandable that the plurality of first protrusions 111 and the plurality of second protrusions 112 are arranged vertically, ensuring that the first protrusions 111 and the second protrusions 112 can cross and communicate with each other, forming a criss-cross grid structure. A plurality of reinforcements 3 are arranged inside each first protrusion 111 and each second protrusion 112, and these reinforcements 3 are evenly spaced. Such a design structure ensures that the entire structure has sufficient support in all directions, effectively disperses the stress that may act on the sealing film layer 1, and prevents deformation or damage caused by local stress concentration. Through the above-mentioned cross-connection design and the uniform distribution of reinforcements 3, the structure not only improves the overall mechanical properties, but also enhances the stability and durability of the structure. Even in the face of multiple stress sources such as the heat shrinkage effect during tank cooling, the direct deformation pressure of the ship beam bending on the tank, and the dynamic load generated by the sloshing of the liquid in the tank, it can maintain a good working state.

[0043] Furthermore, in some specific examples, the intersection of the first protrusion 111 and the second protrusion 112 forms a node, and the first protrusion 111 and the second protrusion 112 intersect at the node to form a cross-shaped corrugated channel, and the reinforcement members 3 are symmetrically distributed near the node in the cross-shaped corrugated channel.

[0044] It is understandable that at each node position, the first protrusion 111 and the second protrusion 112 cross each other perpendicularly to form a cross-shaped corrugated channel, which can distribute stress more evenly when subjected to multi-directional stress, avoiding the problem of excessive local stress. In the cross-shaped corrugated channel, reinforcements 3 are symmetrically distributed near the node positions to ensure that the structural strength around the node is maximized while maintaining the symmetry and stability of the structure. The design of the reinforcement 3 takes into account the need for stress dispersion and prevents the occurrence of corrugation deformation, displacement or torsional deformation by providing additional support at key positions. The symmetrical distribution of reinforcements 3 at the nodes helps to optimize the mechanical properties of the entire membrane enclosure structure. The symmetrically distributed reinforcements 3 not only enhance the stiffness of the wave protrusion 11, but also can effectively maintain the integrity of the structure under the action of asymmetric stress (such as deformation pressure caused by bending of ship beams).

[0045] Natural convection will occur in the channel formed by the wave protrusions 11 of the sealing film layer 1 under the condition of significant temperature gradient, which will reduce the thermal insulation effect of the film enclosure system to a certain extent. In some embodiments of the film enclosure structure of the present invention, a gas flow channel 31 is formed on the reinforcement 3, and the gas flow channels 31 on the two adjacent reinforcements 3 in the first protrusion 111 and the second protrusion 112 are staggered.

[0046] It can be understood that the gas flow channels 31 are formed on the reinforcement 3 in this embodiment. By staggering the gas flow channels 31 on adjacent reinforcements 3, the gas can be effectively prevented from flowing along a straight path in the channel formed by the wave protrusions 11, thereby reducing the occurrence of natural convection. The staggered gas flow channels 31 are particularly important in the presence of a significant temperature gradient, because they can slow down the transfer of heat from the high temperature zone to the low temperature zone through gas convection, thereby improving the thermal insulation effect of the system. The staggered gas flow channels 31 force the gas to change direction when flowing, which not only increases the residence time of the gas inside the system, but also makes the heat exchange more uniform. Such flow path optimization helps to form a more stable internal environment, which is very beneficial for maintaining the low temperature state inside the liquid cargo tank.

[0047] It should be understood that the gas circulation channel 31 inside the reinforcement 3 can be designed into different shapes and sizes according to specific needs to meet the requirements of different application scenarios. For example, the channel can be a straight line, a curved line or a complex three-dimensional structure, which is designed to ensure that the gas can effectively circulate where it is needed while avoiding unnecessary heat transfer. The staggered gas circulation channel 31 also helps to enhance the sealing of the entire system. Since the gas cannot easily leak out through a straight path, it can maintain a good sealing effect even under high pressure or extreme temperature conditions, thereby improving the overall safety of the system. At the same time, the staggered gas circulation channel 31 allows an inert heat insulation barrier to be formed between the wave protrusion 11 and the reinforcement 3, which is crucial for isolating external heat. In addition, the structure also facilitates the realization of a leak detection function, because any abnormal gas flow pattern can be monitored and potential problems can be discovered in a timely manner.

[0048] Specifically, in some examples, the reinforcement member 3 includes a connecting portion 32, a supporting arch portion 33 and a reinforcing rib 34, wherein the connecting portion 32 is used to connect the insulation layer 2; the supporting arch portion 33 is connected to the connecting portion 32, the supporting arch portion 33 is located in the wave protrusion 11, and is formed into a shape that is the same as the cross-section of the inner wall of the wave protrusion 11; the reinforcing rib 34 is located in the space enclosed by the connecting portion 32 and the supporting arch portion 33, and a plurality of reinforcing ribs 34 are cross-arranged to form a plurality of gas circulation channels 31.

[0049] In this example, the reinforcement 3 includes a connection portion 32, a support arch 33 and a reinforcement rib 34, and these three parts work together to achieve the dual functions of structural reinforcement and gas circulation. Specifically, the connection portion 32 is used to firmly connect the reinforcement 3 to the insulation layer 2, ensuring the reliable fixation between the reinforcement 3 and the insulation layer 2, and providing stable mechanical support. The connection portion 32 can be connected to the plywood 21 on the insulation layer 2 in a variety of ways (such as screw fixation, slot fixation or low-temperature adhesive bonding) to ensure installation strength and reliability. The support arch 33 is connected to the connection portion 32 and is located inside the wave protrusion 11. The shape of the support arch 33 is designed to be the same as the cross-section of the inner wall of the wave protrusion 11, which means that it can fit closely to the inner wall of the wave protrusion 11 when the wave protrusion 11 undergoes large deformation or displacement and torsional deformation, providing the best support effect. The reinforcing ribs 34 are located in the space enclosed by the connecting portion 32 and the supporting arch portion 33. A plurality of reinforcing ribs 34 are cross-arranged to form a complex internal frame. The cross-arrangement allows the reinforcing ribs 34 to significantly enhance the rigidity and compressive strength of the entire reinforcement 3. A plurality of gas flow channels 31 are formed between the cross-arranged reinforcing ribs 34. These channels not only allow the gas to flow freely when needed, but also, due to the staggered arrangement of the channels, effectively reduce the occurrence of natural convection, thereby improving the thermal insulation performance of the system.

[0050] The reinforcement member 3 structure composed of the connection part 32, the supporting arch part 33 and the reinforcing rib 34 in this example can not only greatly improve the structural strength of the wave protrusion 11, but also optimize the gas flow path, and achieve a perfect combination of structural stability and functional requirements. The design structure of the reinforcement member 3 takes into account the particularity of marine transportation, and can maintain a good working condition when facing stress concentration problems caused by various factors such as the heat shrinkage effect during the cooling of the tank, the pressure generated by the deformation of the ship, and the expansion and movement of the cargo.

[0051] Further, in some specific examples, the reinforcement member 3 includes an X-shaped reinforcement member and a Y-shaped reinforcement member, and the reinforcement ribs 34 in the X-shaped reinforcement member are arranged in an X-shape or a cross shape, such as Figure 6 The X-shaped cross setup shown and Figure 7 The cross-shaped arrangement shown in the figure, the reinforcing ribs 34 in the Y-shaped reinforcing member are arranged in a Y-shaped cross-shaped arrangement, such as Figure 8 and Fig. 9 Schematic diagram of two Y-shaped cross-setting structures.

[0052] It is understandable that the X-shaped or cross-shaped reinforcing ribs 34 can form a plurality of staggered gas flow channels 31, see Figure 4As shown, these channels not only allow gas to flow in different directions, but also effectively reduce the occurrence of natural convection, thereby improving the thermal insulation effect of the system. The Y-shaped cross-reinforcement ribs 34 also form staggered gas flow channels 31, see Figure 5 As shown, it helps to optimize the gas flow path, reduce direct convection, and maintain temperature stability in the tank.

[0053] In practical applications, X-type reinforcements and Y-type reinforcements can also be arranged in an interlaced manner to form a more complex and efficient support network. This combination not only enhances the stability of the overall structure, but also improves the thermal management and sealing performance of the system through the design of diversified gas flow channels. The design of X-type and Y-type reinforcements takes into account the needs of different application scenarios. The appropriate type of reinforcement can be selected according to the specific stress distribution to ensure the best structural response and functional realization.

[0054] In some embodiments of the membrane enclosure of the present invention, in combination with Figure 1 and Figure 2 As shown, the insulation layer 2 includes a plywood 21 and a polyurethane layer 22, wherein the plywood 21 is arranged on the side of the sealing film layer 1 facing away from the wave protrusion 11, and the reinforcement 3 is connected to the plywood 21; the polyurethane layer 22 is attached to the side of the plywood 21 facing away from the sealing film layer 1.

[0055] It can be understood that the main function of the insulation layer 2 is to isolate the internal and external heat exchange. In the structure of the insulation layer 2 of this embodiment, the plywood 21 is arranged on the side of the sealing film layer 1 facing away from the wave protrusion 11, as the installation base of the reinforcement 3, providing a stable mechanical support platform, and connected to the reinforcement 3 through its surface, ensuring the firmness and reliability of the entire structure. The polyurethane layer 22 is attached to the side of the plywood 21 facing away from the sealing film layer 1. Polyurethane is an efficient thermal insulation material that can effectively isolate the external heat from being transferred to the inside of the sealing film layer 1, maintain the low temperature environment in the liquid cargo tank, and at the same time, provide additional physical protection for the entire film enclosure structure to prevent external factors (such as impact, corrosion, etc.) from affecting the internal structure. By organically combining the plywood 21 and the polyurethane layer 22, the insulation layer 2 of this embodiment not only provides a solid mechanical support for the film enclosure structure, but also significantly improves its thermal insulation performance, thereby bringing higher safety and efficiency to the liquid cargo tank enclosure system in applications such as LNG ships.

[0056] The reinforcement member 3 can be connected to the plywood 21 in a variety of ways (such as screw fixing, slot fixing or low-temperature adhesive bonding), depending on the design requirements and construction conditions. Regardless of which of the above connection methods is used, the installation strength of the reinforcement member 3 on the insulation layer 2 should be guaranteed to be able to withstand the impact of fluid dynamic loads and the offshore environment.

[0057] In some specific examples, a base is provided at the end of the reinforcement member 3 close to the plywood 21, and the base is detachably connected to the plywood 21 through a connector (such as a screw, a bolt, etc.). This detachable design allows the reinforcement member 3 to be easily disassembled and replaced, which is convenient for inspection and maintenance. The position of the reinforcement member 3 can be adjusted or different types of reinforcement members can be replaced according to actual conditions, which increases the flexibility of the system. Through a suitable connector, the strength and reliability of the connection can be ensured, which is suitable for scenes that need to withstand greater stress.

[0058] In some other specific examples, a connection groove is formed on the plywood 21, and the end of the reinforcement member 3 close to the plywood 21 forms a structure adapted to the connection groove. The reinforcement member 3 is clamped in the connection groove on the plywood 21, and the clamping part is filled with low-temperature glue. For example, a V-shaped clamping groove is set on the plywood 21, and the bottom of the reinforcement member 3 is designed to be Fig.10 The V-shaped bottom shown in the figure is installed on the plywood 21 through the interference fit of the V-shaped groove and the V-shaped bottom, and low-temperature glue is filled in the assembly position to maintain a stable connection. The clamping method of this example allows for quick installation and preliminary fixation, improving construction efficiency. The low-temperature glue filling not only enhances the firmness of the connection, but also provides an additional sealing effect to prevent gas leakage. The low-temperature glue can maintain good bonding performance under low temperature conditions to ensure the stability of the connection.

[0059] In some other specific examples, the end of the reinforcement member 3 close to the plywood 21 is fixed to the surface of the plywood 21 by low-temperature adhesive bonding, and the bottom of the reinforcement member 3 should have a large enough area for bonding, and the thickness of the reinforcement member 3 can be increased, or a fixed base can be set at the bottom of the reinforcement member 3. This example does not require additional mechanical connectors, simplifies the installation steps, and reduces the installation cost. The low-temperature adhesive can provide a seamless connection interface, enhance the sealing and aesthetics of the overall structure, and low-temperature adhesive bonding provides an effective solution for irregular surfaces or surfaces that are difficult to use mechanical connectors.

[0060] On the other hand, the present invention further provides a liquid cargo tank containment system. The liquid cargo tank containment system of the present invention comprises the film containment structure of any one of the above-mentioned embodiments. In some embodiments, the liquid cargo tank body is enclosed by the film containment structure, the sealing film layer 1 of the film containment structure is located inside the liquid cargo tank body, and is used for contacting the stored fluid in the liquid cargo tank body, and the insulation layer 2 of the film containment structure is located outside the liquid cargo tank body, and is used for isolating the heat exchange between the stored fluid in the sealing film layer 1 and the external environment.

[0061] It can be understood that the liquid cargo tank containment system of this embodiment is mainly composed of a film containment structure, which includes key components such as a sealing film layer 1, an insulation layer 2, and a reinforcement 3. It is particularly suitable for liquid cargo tanks in LNG (liquefied natural gas) ships, and is used to store LNG cargoes at a temperature of -162°C. The sealing film layer 1 is located inside the tank body of the liquid cargo tank and is in direct contact with the stored fluid (such as LNG). It serves as the first barrier to prevent liquid leakage and ensure compatibility with the cryogenic fluid stored in the liquid cargo tank. The insulation layer 2 is located outside the tank body of the liquid cargo tank, on the back side of the sealing film layer 1. Its main function is to isolate the heat exchange between the stored fluid in the sealing film layer 1 and the external environment, maintain the low temperature state in the liquid cargo tank, reduce energy loss and improve the insulation effect.

[0062] A plurality of wave protrusions 11 are formed by the sealing film layer 1. One side of the wave protrusion 11 of the sealing film layer 1 is in contact with the liquid inside the cargo tank. The wave structure of the wave protrusion 11 can self-contract and deform to release the stress when subjected to deformation stress, so as to maintain the stability of the overall structure. By placing the insulation layer 2 on the outside, it is possible to effectively prevent external heat from being transferred into the cargo tank, and maintain the internal low-temperature environment, which is crucial for the long-term stable storage of cryogenic fluids such as LNG. The combination of the dual protection of the sealing film layer 1 and the insulation layer 2 not only provides a physical barrier, but also forms an efficient thermal insulation barrier, ensuring the overall safety of the system.

[0063] The reinforcement 3 supports the wave protrusion 11 inside the wave protrusion 11, which not only significantly improves the overall strength of the liquid cargo tank containment system, but also creatively solves the stress concentration problem caused by various factors (such as the thermal shrinkage effect during the cooling of the tank, the pressure generated by the deformation of the ship, and the expansion movement of the cargo). The adjacent reinforcements 3 between the sealing film layer 1 and the insulation layer 2 are designed with staggered gas flow channels, which helps to optimize the gas flow path, reduce natural convection, and further improve the thermal insulation performance of the system. Through the above-mentioned structural design and innovation, not only the structural performance of the wave structure of the sealing film layer 1 is strengthened, but also the natural convection phenomenon in the wave channel is effectively suppressed, the overall structural stability of the tank is improved, and it is ensured that excellent sealing effect and high safety can be maintained under various operating conditions and external environmental changes.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A film enclosure structure, characterized in that: include: A sealing film layer (1), wherein a plurality of wave protrusions (11) are formed on a surface of one side of the sealing film layer (1); A heat insulating layer (2) arranged on a side of the sealing film layer (1) facing away from the wave protrusion (11); A reinforcing member (3) is arranged between the sealing film layer (1) and the thermal insulation layer (2); the reinforcing member (3) is connected to the thermal insulation layer (2) and extends into the wave protrusion (11) formed by the sealing film layer (1).

2. The membrane enclosure structure according to claim 1, characterized in that: A gap is formed between the edge of the reinforcement member (3) and the inner wall of the wave protrusion (11).

3. The membrane enclosure structure according to claim 2, characterized in that: The plurality of wave protrusions (11) comprise a plurality of first protrusions (111) arranged in parallel along a first direction and a plurality of second protrusions (112) arranged in parallel along a second direction, the first direction and the second direction being perpendicular so that the first protrusions (111) and the second protrusions (112) intersect and communicate with each other, and a plurality of the reinforcing members (3) are arranged in each of the first protrusions (111) and each of the second protrusions (112), and the plurality of the reinforcing members (3) are arranged at even intervals.

4. The membrane enclosure structure according to claim 3, characterized in that: The intersection of the first raised portion (111) and the second raised portion (112) forms a node, the first raised portion (111) and the second raised portion (112) intersect at the node to form a cross-shaped corrugated channel, and the reinforcing members (3) are symmetrically distributed near the node in the cross-shaped corrugated channel.

5. The membrane enclosure structure according to claim 3, characterized in that: A gas circulation channel (31) is formed on the reinforcement member (3), and the gas circulation channels (31) on two adjacent reinforcement members (3) in the first raised portion (111) and the second raised portion (112) are arranged in a staggered manner.

6. The membrane enclosure structure according to claim 1, characterized in that: The reinforcement member (3) comprises: A connecting portion (32) used for connecting the thermal insulation layer (2); A supporting arch portion (33) connected to the connecting portion (32), the supporting arch portion (33) being located inside the wave protrusion (11) and formed into a shape that is the same as the cross-section of the inner wall of the wave protrusion (11); The reinforcing ribs (34) are located in a space enclosed by the connecting portion (32) and the supporting arch portion (33), and a plurality of the reinforcing ribs (34) are arranged crosswise to form a plurality of gas flow channels (31).

7. The membrane enclosure structure according to claim 6, characterized in that: The reinforcement member (3) comprises an X-shaped reinforcement member and a Y-shaped reinforcement member, the reinforcement ribs (34) in the X-shaped reinforcement member are arranged crosswise in an X shape or a cross shape, and the reinforcement ribs (34) in the Y-shaped reinforcement member are arranged crosswise in a Y shape.

8. The membrane enclosure structure according to any one of claims 1 to 7, characterized in that: The thermal insulation layer (2) comprises: A plywood (21) is arranged on a side of the sealing film layer (1) facing away from the wave protrusion (11), and the reinforcing member (3) is connected to the plywood (21); The polyurethane layer (22) is adhered to the side of the plywood (21) facing away from the sealing film layer (1).

9. The membrane enclosure structure according to claim 8, characterized in that: The reinforcement member (3) is provided with a base at an end portion close to the plywood (21), and the base is detachably connected to the plywood (21) via a connecting member; or, A connection groove is formed on the plywood (21); an end portion of the reinforcement member (3) close to the plywood (21) forms a structure adapted to the connection groove; the reinforcement member (3) is clamped to the connection groove on the plywood (21), and a low-temperature glue is filled at the clamping position; or, The end of the reinforcement member (3) close to the plywood (21) is fixed to the surface of the plywood (21) by means of low-temperature adhesive.

10. A liquid cargo tank containment system, characterized in that: The membrane enclosure structure comprises the membrane enclosure structure as claimed in any one of claims 1 to 9, wherein the membrane enclosure structure encloses a liquid cargo tank body, the sealing membrane layer (1) of the membrane enclosure structure is located inside the liquid cargo tank body and is used for contacting the stored fluid in the liquid cargo tank body, and the thermal insulation layer (2) of the membrane enclosure structure is located outside the liquid cargo tank body and is used for isolating the heat exchange between the stored fluid in the sealing membrane layer (1) and the external environment.

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