Elastic seal between a liquid cargo tank and a ship's hull and a ship

Abstract

The application provides a flexible sealing device between a liquid cargo tank and a ship body and a ship. The flexible sealing device comprises a transition structure, a skirt structure, a cover and a sealing ring, which are annular and conductive. The transition structure is arranged around the top of the liquid cargo tank and is sealingly connected with the outer wall of the liquid cargo tank. The skirt structure is sealingly connected with the ship body and forms an annular opening with the transition structure. The sealing ring is sealingly connected with the transition structure on the inner side and is sealingly connected with the skirt structure on the outer side. The cover covers the sealing ring and is provided with a bending part along the annular circumference. The inner side of the cover is sealingly connected with the transition structure and forms an electric passage, the outer side of the cover is sealingly connected with the skirt structure and forms an electric passage, and a sealing cavity is formed between the cover and the sealing ring. The technical scheme can effectively release the static electricity generated by the liquid cargo tank, can seal the area of the liquid cargo tank, and can provide a buffer for the position movement and thermal expansion and contraction of the liquid cargo tank.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship liquid tank construction, in particular to an elastic sealing device between a liquid cargo tank and a ship body and a ship. BACKGROUND

[0002] In a liquefied gas transport ship with an independent liquid cargo tank, a cargo tank structure is formed by ship body manufacturing, and then the liquid cargo tank is installed and placed in the cargo tank structure.

[0003] The liquid cargo tank stores various low-temperature liquid cargos such as LPG, LEG and LNG for a long time, and the liquid cargo tank may generate static electricity, which may cause a risk of static fire. In order to eliminate static electricity, a cable is generally used to connect the liquid cargo tank and the ship body structure, so as to release the static electricity generated by the liquid cargo tank, thereby reducing the risk of static fire. However, the cable may be aged and detached in long-term use, which may cause an accidental static fire accident. In addition, the cable wiring is relatively messy, which is not conducive to achieving convenient and neat construction requirements.

[0004] Further, since the independent liquid cargo tank is not completely fixed in the cargo tank structure of the ship body, it is affected by the ship navigation movement load and the temperature change load during loading and unloading, and the liquid cargo tank generates a certain position movement or thermal expansion and contraction. Therefore, in the prior art, a certain space is left between the liquid cargo tank and the cargo tank structure, which is called a hold space, in order to buffer the displacement or expansion and contraction generated above. The hold space provides a buffer space for the position movement and thermal expansion and contraction of the liquid cargo tank. At the same time, in order to isolate the dangerous gas source, it is required that the hold space is always in a sealed dry or inert state, and a gas supplement system is used to supplement nitrogen or inert gas into the hold space, so that the hold space maintains a slightly positive pressure state.

[0005] In a conventional technical solution, a ring-shaped sealing ring is generally used to close the opening position of the hold space, so as to ensure that the hold space is in a closed state. However, under the repeated displacement of the liquid cargo tank, the gas in the hold space is squeezed, which repeatedly impacts the sealing ring, and thus the service life of the sealing ring may be reduced.

[0006] At the same time, the displacement of the liquid cargo tank may also pull the cable used for releasing static electricity, which may cause damage to the cable, and thus increase the risk of static fire. SUMMARY

[0007] The purpose of the embodiment of the present application is to provide an elastic sealing device between a liquid cargo tank and a ship body and a ship, which can effectively release the static electricity generated by the liquid cargo tank, and can also seal the hold space and provide a buffer for the position movement and thermal expansion and contraction of the liquid cargo tank.

[0008] In a first aspect, an elastic sealing device between a liquid cargo tank and a ship body is provided, which comprises a conductive transition structure, a conductive skirt structure, a conductive skirt structure, an elastic sealing ring, and a conductive cover.

[0009] The conductive transition structure is annular in shape and arranged around the top of the liquid cargo tank, and the transition structure is sealingly connected with the outer wall of the liquid cargo tank. The conductive skirt structure is annular in shape and arranged around the liquid cargo tank, and the skirt structure is sealingly connected with the ship body; the skirt structure and the transition structure form an annular opening. The elastic sealing ring is annular in shape, and the inner side of the annular sealing ring is sealingly connected with the transition structure, and the outer side of the annular sealing ring is sealingly connected with the skirt structure, so as to close the annular opening. The conductive cover is annular in shape and is provided with at least one bending part extending along the circumference of the annular cover for bearing deformation; the cover covers the sealing ring, and the inner side of the cover is sealingly connected with the transition structure and forms an electric circuit path, and the outer side of the cover is sealingly connected with the skirt structure and forms an electric circuit path, and a sealing cavity extending along the annular cover is formed between the cover and the sealing ring.

[0010] In an implementable scheme, the cover comprises two transition sections in the middle, which are connected at a predetermined included angle to form the bending part, and the predetermined included angle at the connection of the two transition sections is towards the sealing ring.

[0011] In an implementable scheme, the part of the sealing ring between the annular openings is configured as an arch part, and the convex side of the arch part faces the cover.

[0012] In an implementable scheme, the cross section of the part of the sealing ring between the annular openings is configured as a curve.

[0013] In an implementable scheme, the top of the liquid cargo tank is a surrounding wall structure, the upper part of the surrounding wall structure is covered with a gas chamber platform plate, the edge of the gas chamber platform plate exceeds the edge of the surrounding wall structure, and the elastic sealing device further comprises an annular protection plate; the upper end of the protection plate is connected with the part of the gas chamber platform plate that exceeds the edge of the surrounding wall structure, and the lower end of the protection plate extends from the outer side of the cover to near the skirt structure, so as to cover the cover and the sealing ring.

[0014] In an implementable scheme, the cross section of the protection plate is in a stepped structure, and the lower side of the stepped structure is closer to the outer side than the upper side.

[0015] In an implementable scheme, an elbow plate is arranged between the gas chamber platform plate and the transition structure for support, the upper side of the elbow plate is connected with the lower surface of the gas chamber platform plate, the lower side of the elbow plate is connected with the transition structure, and the side edge of the elbow plate is connected with the outer side of the surrounding wall of the top of the liquid cargo tank.

[0016] In an embodiment, the air chamber top plate is arranged at a predetermined depth in the wall structure, and the wall structure and the air chamber top plate form a groove, and the groove is filled with thermal insulation material to form an air chamber thermal insulation layer.

[0017] In an embodiment, the wall structure has a triangular cross section.

[0018] In an embodiment, the sealing cavity formed between the cover and the sealing ring is filled with nitrogen or inert gas.

[0019] In an embodiment, the elastic sealing device further comprises a pressure detection device connected to the sealing cavity to detect the pressure change in the sealing cavity; and the cover is provided with an air port which can be opened and closed.

[0020] In an embodiment, the elastic sealing device further comprises a gas source device connected to the air port, and a controller connected to the gas source device and the pressure detection device; the controller receives the pressure signal sent by the pressure detection device, and controls the gas source device to fill or extract a predetermined amount of gas into or from the sealing cavity through the air port according to a predetermined setting.

[0021] According to a second aspect of the present application, a ship is also provided, which comprises the elastic sealing device between the liquid cargo tank and the ship body in the above-mentioned embodiments.

[0022] Compared with the prior art, the present application has at least the following beneficial effects:

[0023] (1) The annular sealing ring is used to seal the annular opening formed by the skirt structure and the transition structure, so as to seal the cargo tank area and isolate the dangerous gas source. In addition, the sealing ring has elasticity, so that when the liquid cargo tank is displaced due to vibration or thermal expansion and contraction, the gas pressure in the cargo tank area changes or the size of the annular opening on one side changes, and the sealing ring deforms to adapt to the change of the gas pressure in the cargo tank area or the size of the annular opening, so as to achieve better buffering effect.

[0024] (2) The cover and the sealing ring form a sealing cavity extending along the annular direction, and when the gas pressure in the cargo tank area is high, the sealing ring deforms towards the outside of the annular opening, which can press the gas in the sealing cavity, so as to buffer and resist the deformation of the sealing ring, prevent the over-deformation of the sealing ring, reduce the impact of the deformation of the sealing ring, and thus prolong the service life of the sealing ring.

[0025] (3) The conductive cover connects the transition structure and the skirt structure, realizes the circuit path between the liquid cargo tank and the ship body, when the liquid cargo tank generates static electricity, the static electricity is directly transmitted to the ship body through the conductive cover, and then transmitted to the seawater, so as to minimize the risk of static electricity generated by the independent liquid cargo tank itself, and play a role in preventing static electricity and explosion. The conductive cover completely replaces the traditional cable connection mode, is neat and tidy, has a large contact area, and effectively ensures the effect of static electricity transmission and release.

[0026] (4) The conductive cover is equivalent to covering the sealing ring, and also plays a covering and protecting role on the sealing ring, basically isolates the damage of foreign matters in the outside world to the sealing ring, so as to relatively improve the service life of the sealing ring.

[0027] (5) When the annular opening changes in size due to displacement of the liquid cargo tank caused by vibration or thermal expansion and contraction, the bending part of the cover can also produce certain deformation to adapt to the size change of the annular opening. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0029] Figure 1 It is a top view of a flexible sealing device between a liquid cargo tank and a ship body according to an embodiment of the present application.

[0030] Figure 2 It is a mid-longitudinal section view of a flexible sealing device between a liquid cargo tank and a ship body according to an embodiment of the present application.

[0031] Figure 3 It is a partial structure enlarged view at A. Figure 2

[0032] Figure 4 It is a partial section view of a flexible sealing device with a sealing ring cross section of a curve type according to an embodiment of the present application.

[0033] Figure 5 It is a partial schematic view of a flexible sealing device with an inflatable sealing cavity according to an embodiment of the present application.

[0034] ​In the figure: 10, transition structure; 20, skirt structure; 30, sealing ring; 31, arch part; 40, cover; 401, bending part; 41, transition section; 42, air port; 50, protective plate; 60, pressure detection device; 70, air source device; 80, controller; 100, liquid cargo tank; 101, surrounding wall structure; 102, air chamber platform plate; 103, knee plate; 104, air chamber top plate; 105, air chamber insulation layer; 200, ship body; 300, annular opening; 400, sealing cavity. DETAILED DESCRIPTION

[0035] To make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0037] In a first aspect, as shown in Figure 1 , Figure 2 and Figure 3 , the embodiments of the present application provide an elastic sealing device between a liquid cargo tank and a ship body, comprising a conductive transition structure 10, a conductive skirt structure 20, a conductive skirt structure 20, a sealing ring 30 with elasticity, and a conductive cover 40.

[0038] In the embodiments of the present application, the conductive transition structure 10 is arranged on the liquid cargo tank 100, and the conductive skirt structure 20 is arranged on the ship body 200. Figure 3As shown, the electrically conductive transition structure 10 is annular in whole, which is arranged around the top of the liquid cargo tank 100, and the transition structure 10 is sealingly connected with the outer wall of the liquid cargo tank 100. The electrically conductive skirt structure 20 is annular in whole, which is arranged around the liquid cargo tank 100, and the skirt structure 20 is sealingly connected with the ship body 200; the skirt structure 20 and the transition structure 10 form an annular opening 300. The elastic sealing ring 30 is annular in whole, the inner side of which is sealingly connected with the transition structure 10, and the outer side of which is sealingly connected with the skirt structure 20, so as to close the annular opening 300. The electrically conductive cover 40 is annular in whole, which is provided with at least one bending part 401 extending along the annular circumference for bearing deformation, the cover 40 covers the sealing ring 30, and the inner side of the cover 40 is sealingly connected with the transition structure 10 and forms an electric circuit passage, and the outer side of the cover 40 is sealingly connected with the skirt structure 20 and forms an electric circuit passage, and the cover 40 and the sealing ring 30 form a sealing cavity 400 extending along the annular circumference.

[0039] In use of the technical scheme of the above embodiment, the annular sealing ring 30 is used to close the annular opening 300 formed by the skirt structure 20 and the transition structure 10, so as to realize the sealing of the cargo tank area and play the role of isolating the dangerous gas source. Because the sealing ring 30 is elastic, when the liquid cargo tank 100 is displaced due to vibration or thermal expansion and contraction, the gas pressure in the cargo tank area changes or the size of the annular opening 300 on one side changes, and then the sealing ring 30 deforms to adapt to the change of the gas pressure in the cargo tank area or the size change of the annular opening 300, so as to realize better buffering effect.

[0040] Meanwhile, because the cover 40 and the sealing ring 30 form the sealing cavity 400 extending along the annular circumference, when the gas pressure in the cargo tank area is large, the sealing ring 30 deforms towards the outer side of the annular opening 300 and squeezes the gas in the sealing cavity 400, so as to buffer and resist the deformation of the sealing ring 30 to some extent, prevent the over-deformation of the sealing ring 30, reduce the impact of the deformation on the sealing ring 30, and thus prolong the service life of the sealing ring 30.

[0041] Further, the electrically conductive cover 40 connects the transition structure 10 and the skirt structure 20, so as to realize the electric circuit passage of the liquid cargo tank 100 and the ship body 200, when static electricity is generated in the liquid cargo tank 100, the static electricity is directly transmitted to the ship body 200 through the electrically conductive cover 40, and then transmitted to seawater, so as to minimize the risk of fire or explosion caused by static electricity generated in the independent liquid cargo tank 100, and play the role of anti-static and explosion-proof. The electrically conductive cover 40 completely replaces the traditional cable connection mode, is neat and tidy, has large contact area, and effectively ensures the effect of static electricity transmission and release.

[0042] Furthermore, the conductive cover 40 covers the sealing ring 30, providing protection and essentially isolating it from damage by external objects, thus improving its service life.

[0043] Furthermore, when the cargo tank 100 is displaced due to vibration or changes in the size of the annular opening 300 due to thermal expansion and contraction, the bent portion 401 of the cover 40 can also undergo a certain deformation to adapt to the change in the size of the annular opening 300.

[0044] In summary, the cover 40 is not only used to release static electricity, but also forms a sealed cavity 400 with the sealing ring 30 to buffer the deformation of the sealing ring 30. The cover 40 can also cover and protect the sealing ring 30, and can withstand a certain amount of deformation to adapt to the change in the size of the annular opening 300.

[0045] like Figure 3 As shown, in this embodiment, the cover 40 preferably includes two transition sections 41 located in the middle. The two transition sections 41 are connected at a predetermined angle to form a bent portion 401. The predetermined angle at the connection of the two transition sections 41 faces the sealing ring 30. On the one hand, the two transition sections 41 form a non-planar predetermined angle, which can withstand local elastic deformation; on the other hand, it forms a sharp corner to block foreign objects, etc. The cover 40 is preferably made of stainless steel sheet.

[0046] like Figure 3 As shown, in this embodiment, the portion of the sealing ring 30 located between the annular openings 300 can be configured as an arched portion 31, with the protruding side of the arched portion 31 facing the cover 40, thereby better withstanding the gas pressure from the cargo hold area and also helping to adapt to changes in the size of the annular opening 300.

[0047] like Figure 4 As shown, in another embodiment, the cross-section of the portion of the sealing ring 30 located between the annular openings 300 can also be configured to be curved, which also helps to accommodate changes in the size of the annular openings 300.

[0048] like Figure 3 As shown, in this embodiment, the top of the liquid cargo tank 100 is a wall structure 101, and the upper part of the wall structure 101 is covered by an air chamber platform plate 102, the edge of which extends beyond the edge of the wall structure 101. The resilient sealing device may also include an annular protective plate 50. The upper end of the protective plate 50 is connected to the portion of the air chamber platform plate 102 that extends beyond the edge of the wall structure 101, and the lower end of the protective plate 50 extends from the outside of the cover member 40 to near the skirt structure 20 to cover the cover member 40 and the sealing ring 30, thereby providing water and sun protection and helping to improve the service life of the sealing ring 30 and the cover member 40.

[0049] In the embodiment, the cross section of the protection plate 50 is in a ramp type or a stepped structure, as shown in the figure, preferably a stepped structure, the lower side of which is closer to the outer side of the circle than the upper side, which can increase the structural strength and is also conducive to water drainage and flow guide. Meanwhile, the connection between the protection plate 50 and the air chamber platform plate 102 is detachable, which is convenient for later disassembly and is conducive to inspection, maintenance, replacement of the sealing ring 30 and / or the cover 40. Figure 3

[0050] As shown in the figure, in the embodiment, an elbow plate 103 for support is arranged between the air chamber platform plate 102 and the transition structure 10, the upper side of the elbow plate 103 is connected with the lower surface of the air chamber platform plate 102, the lower side of the elbow plate 103 is connected with the transition structure 10, and the side edge of the elbow plate 103 is connected with the outer side of the surrounding wall of the top of the liquid cargo tank 100. The elbow plate 103 plays a reinforcing role, prevents excessive deformation in a local part, and reduces the influence of deformation on the sealing performance of the sealing ring 30 and the cover 40. Figure 3

[0051] As shown in the figure, in the embodiment, a gas chamber top plate 104 is arranged at a predetermined depth in the surrounding wall structure 101, the gas chamber top plate 104 is used to close the liquid cargo tank 100; the surrounding wall structure 101 and the gas chamber top plate 104 enclose a groove, and the groove is filled with a foamed polyurethane or other thermal insulation material to form a gas chamber thermal insulation layer 105, so as to play a thermal insulation role on the liquid cargo tank 100 and avoid cold spots as much as possible to affect safety. Figure 2

[0052] As shown in the figure, in the embodiment, the cross section of the surrounding wall structure 101 is triangular, which reduces one stress structure point compared with a traditional quadrilateral, is conducive to reducing the possibility of structural damage, and thus improves the structural stability. Meanwhile, the triangular surrounding wall has a smaller amount of construction materials and is relatively simple to construct. Figure 1 In the embodiment, nitrogen or inert gas can be filled in the sealing cavity 400 formed between the cover 40 and the sealing ring 30, so as to constitute two layers of gas sealing barriers together with the nitrogen or inert gas in the cargo tank area, thereby further improving the isolation effect on the dangerous gas source. In addition, the sealing ring 30 is surrounded by the inert gas, which greatly reduces the oxidation reaction of the sealing ring 30 and slows down the aging speed of the sealing ring 30, thereby helping to increase the service life of the sealing ring 30.

[0053] Meanwhile, after the nitrogen or inert gas is filled in the sealing cavity 400, the pressure in the sealing cavity 400 is preferably balanced with the pressure in the cargo tank area in a static state.

[0054] Further, as shown in the figure, in the embodiment, the sealing cavity 400 is provided with a plurality of gas inlets 401, which are arranged on the side edge of the sealing cavity 400 and are connected with the outside of the sealing cavity 400, so as to facilitate the filling of nitrogen or inert gas in the sealing cavity 400.

[0055] Figure 5 ​​​​As shown, the elastic sealing device can further comprise a pressure detecting device 60, which is connected to the sealing cavity 400 to detect the pressure change in the sealing cavity 400; and the cover 40 is provided with an openable and closable air port 42. In case of slow leakage of the sealing cavity 400 in long-term use, although the leakage is very slow, but in long-term use, the nitrogen or inert gas in the sealing cavity 400 will be reduced. At this time, the gas pressure condition of the sealing cavity 400 can be known through the pressure detecting device 60, and it is judged whether there is leakage. If there is leakage, nitrogen or inert gas can be supplemented into the sealing cavity 400 through the air port 42. The gas in the sealing cavity 400 can also be extracted through the air port 42 for replacement.

[0056] Further, as shown, Figure 5 The elastic sealing device further comprises a gas source device 70 and a controller 80, the gas source device 70 is connected to the air port 42, and the controller 80 is signal connected with the gas source device 70 and the pressure detecting device 60; the controller 80 receives the pressure signal sent by the pressure detecting device 60, and controls the gas source device 70 to fill or extract a predetermined amount of gas into the sealing cavity 400 through the air port 42 according to the predetermined setting.

[0057] Specifically, the controller 80 can be set with a first standard pressure range, a second standard pressure range and an initial pressure value, the lower limit value of the first standard pressure range is greater than the upper limit value of the second standard pressure range, and the initial pressure value is between the lower limit value of the first standard pressure range and the upper limit value of the second standard pressure range. The initial pressure value is the gas pressure value in the sealing cavity 400 when the liquid cargo tank 100 is basically in a static state.

[0058] In the first working process, if the gas pressure in the cargo tank area rises and extrudes the sealing ring 30, and then the sealing ring 30 extrudes the sealing cavity 400, causing the gas pressure value of the sealing cavity 400 to rise from the initial pressure value, the controller 80 receives the pressure detecting device 60, and judges that the gas pressure value of the sealing cavity 400 rises and falls in the first standard pressure range. When the controller 80 can control the gas source device 70 to pass a predetermined amount of nitrogen or inert gas into the sealing cavity 400 through the air port 42, so as to further increase the gas pressure in the sealing cavity 400, so as to resist the deformation of the sealing ring 30, which can not only prevent the sealing ring 30 from deforming too much outward, but also form a reaction force on the sealing ring 30 to make it recover to the initial state as soon as possible, thereby helping the gas pressure in the cargo tank area to stabilize quickly.

[0059] In the second working process, if the air pressure in the empty cargo area decreases, the sealing ring 30 deforms towards the empty cargo area, causing the air pressure value of the sealing cavity 400 to decrease from the initial pressure value. When the controller 80 receives the pressure detection device 60 and determines that the air pressure value of the sealing cavity 400 falls within the second standard pressure range, the controller 80 can control the gas source device 70 to continue extracting nitrogen or inert gas from the sealing cavity 400 through the air port 42 to form a vacuum effect, thereby resisting the deformation of the sealing ring 30. This not only prevents the sealing ring 30 from deforming too much downward, but also forms a counterforce on the sealing ring 30, allowing the sealing ring 30 deformed towards the empty cargo area to quickly return to its initial state, thereby helping to quickly stabilize the air pressure in the empty cargo area.

[0060] Because the liquid cargo tank 100 will cause the air pressure in the empty cargo area to fluctuate due to the sway during navigation, the states of the aforementioned two working processes will appear alternately and repeatedly, so that the sway of the liquid cargo tank 100 can be quickly stabilized.

[0061] It should be noted that, as shown in Figure 1 The air chamber platform plate 102 can be a panel with triangular openings, and the openings are symmetrically arranged. The opening area can be provided with a detachable grille for walking. The panel can be provided with a liquid cargo pipe unit commonly used on gas ships, a spray pipe support for fire extinguishing, and the like.

[0062] According to the second aspect of the present application, a ship is also provided, which includes the elastic sealing device between the liquid cargo tank and the ship body in the foregoing scheme.

[0063] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An elastic sealing device between a liquid cargo tank and a ship body, comprising: a conductive transition structure (10) in the shape of a ring, arranged around the top of the liquid cargo tank (100), and sealingly connected with the outer wall of the liquid cargo tank (100); a conductive skirt structure (20) in the shape of a ring, arranged around the liquid cargo tank (100), and sealingly connected with the ship body (200); the skirt structure (20) and the transition structure (10) form a ring-shaped opening (300); a sealing ring (30) in the shape of a ring, with elasticity, sealingly connected with the transition structure (10) on the inner side of the ring, and sealingly connected with the skirt structure (20) on the outer side of the ring, so that the sealing ring (30) closes the ring-shaped opening (300); a conductive cover (40) in the shape of a ring, provided with at least one bending part (401) extending along the ring for bearing deformation; the cover (40) covers the sealing ring (30), and the inner side of the cover (40) is sealingly connected with the transition structure (10) and forms a circuit passage, and the outer side of the cover (40) is sealingly connected with the skirt structure (20) and forms a circuit passage, and a sealing cavity (400) extending along the ring is formed between the cover (40) and the sealing ring (30); wherein a space is left between the liquid cargo tank (100) and the cargo tank structure of the ship body (200) to form a cargo empty tank area, and the cargo empty tank area is filled with inert gas; the sealing cavity (400) between the cover (40) and the sealing ring (30) is filled with inert gas.

2. A flexible seal between a cargo tank and a ship's hull according to claim 1, characterized in that The cover (40) comprises two transition sections (41) in the middle, which are connected at a predetermined included angle to form the bending part (401), and the predetermined included angle at the connection of the two transition sections (41) faces the sealing ring (30).

3. A flexible seal between a cargo tank and a ship's hull according to claim 2, characterized in that The part of the sealing ring (30) between the ring-shaped openings (300) is configured as an arch part (31), and the convex side of the arch part (31) faces the cover (40).

4. A flexible seal between a cargo tank and a ship's hull according to claim 2, characterized in that The cross section of the part of the sealing ring (30) between the ring-shaped openings (300) is configured as a curve.

5. The flexible seal between a cargo tank and a ship's hull according to claim 1, wherein the top of the cargo tank (100) is a coaming structure (101), the upper part of the coaming structure (101) is covered with an air chamber platform plate (102), the edge of the air chamber platform plate (102) exceeds the edge of the coaming structure (101), characterized in that, The elastic sealing device further comprises a protective plate (50) in the shape of a ring; the upper end of the protective plate (50) is connected with the part of the air chamber platform plate (102) beyond the edge of the surrounding wall structure (101), and the lower end of the protective plate (50) extends from the outer side of the cover (40) to near the skirt structure (20), so as to cover the cover (40) and the sealing ring (30).

6. A flexible seal between a cargo tank and a ship's hull according to claim 5, characterized in that The cross section of the protective plate (50) is in the shape of a stepped structure, and the lower side of the stepped structure is closer to the outer ring side than the upper side.

7. A flexible seal between a cargo tank and a ship's hull according to claim 5, characterized in that An elbow plate (103) is arranged between the air chamber platform plate (102) and the transition structure (10), the upper side of the elbow plate (103) is connected with the lower surface of the air chamber platform plate (102), the lower side of the elbow plate (103) is connected with the transition structure (10), and the side edge of the elbow plate (103) is connected with the outer side of the surrounding wall of the top of the liquid cargo tank (100).

8. A flexible seal between a cargo tank and a ship's hull according to claim 5, characterized in that An air chamber top plate (104) is arranged at a predetermined depth in the surrounding wall structure (101), and the air chamber top plate (104) is used to close the liquid cargo tank (100). The surrounding wall structure (101) and the air chamber top plate (104) form a groove, and the groove is filled with thermal insulation material to form an air chamber thermal insulation layer (105).

9. A flexible seal between a cargo tank and a ship's hull according to claim 5, characterized in that The cross section of the surrounding wall structure (101) is triangular.

10. A flexible seal between a cargo tank and a ship's hull according to claim 1, characterized in that The elastic sealing device further comprises a pressure detection device (60) which is connected to the sealing cavity (400) and is used to detect the pressure change in the sealing cavity (400). An air port (42) which can be opened and closed is arranged on the cover (40).

11. A flexible seal between a cargo tank and a ship's hull according to claim 10, characterized in that The elastic sealing device further comprises a gas source device (70) and a controller (80), the gas source device (70) is connected with the air port (42), and the controller (80) is signal connected with the gas source device (70) and the pressure detection device (60). The controller (80) receives the pressure signal sent by the pressure detection device (60) and controls the gas source device (70) to fill or extract a predetermined amount of gas into or out of the sealing cavity (400) through the air port (42) according to the predetermined setting.

12. A vessel, characterized in that An elastic sealing device between a liquid cargo tank and a ship body comprises the liquid cargo tank according to any one of claims 1-11. An elastic sealing device between a liquid cargo tank and a ship body comprises the liquid cargo tank according to any one of claims 1-11.

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