Liquid hydrogen transport device

Abstract

The application provides a liquid hydrogen transportation device, which comprises a transportation device body, a buoyancy structure and a connecting structure, the buoyancy structure is arranged at the lower part of the transportation device body and is connected with the transportation device body through the connecting structure, and the buoyancy structure is used for entering a water body; a cabin is arranged in the buoyancy structure, and the cabin is configured to accommodate a ballast device to adjust the water entry depth of the liquid hydrogen transportation device. By arranging the buoyancy structure and the ballast adjustment cabin in the buoyancy structure, the water level line of the transportation device body can be adjusted under different load working conditions to obtain minimum water resistance, the sailing resistance is effectively reduced, and the transportation efficiency of the liquid hydrogen transportation device is improved.

Description

Technical Field

[0001] This invention relates to the field of water transport equipment technology, and in particular to a liquid hydrogen transport device. Background Technology

[0002] With the continuous expansion of the green energy industry and the International Maritime Organization's (IMO) timetable for net-zero greenhouse gas emissions from ships, the shipping industry's demand for net-zero fuel is increasing, and the scale of the liquid hydrogen production and transportation industry is also gradually expanding. Traditionally, the maritime transportation solutions for liquid hydrogen have mainly drawn on the design experience of liquefied petroleum gas (LPG) and liquefied natural gas (LNG) carriers, adopting streamlined hulls, single-engine single-propeller propulsion, and displacement-type cargo hold structures.

[0003] However, the aforementioned design based on a displacement hull has significant shortcomings in practical applications. Due to the extremely low density of liquid hydrogen, traditional displacement-type vessels have insufficient draft for transportation, resulting in poor navigation attitude and unsatisfactory hydrodynamic performance, such as wave-making resistance. A typical gas carrier structure usually consists of a main hull and its internally enclosed independent liquid cargo tanks. In this configuration, the tanks need to adapt to the internal shape of the hull, thus requiring custom-designed tanks for each vessel type, involving extensive calculations, simulations, analysis, and manufacturing. Further increasing the cargo capacity necessitates designing larger hulls and correspondingly larger tanks, significantly increasing design difficulty and manufacturing complexity. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the problems of unstable water resistance and low navigation efficiency caused by changes in draft due to changes in load in the prior art of liquid hydrogen transportation devices, and to provide a liquid hydrogen transportation device.

[0005] A liquid hydrogen transport device includes a transport device body, a buoyancy structure, and a connecting structure. The buoyancy structure is disposed at the lower part of the transport device body and is connected to the transport device body through the connecting structure. The buoyancy structure is used to enter a body of water. The buoyancy structure has a compartment inside, which is configured to accommodate ballast equipment to adjust the water inlet depth of the liquid hydrogen transport device.

[0006] In this design, by setting up independent buoyancy and connecting structures, the main body of the transport device is mounted on the buoyancy structure via the connecting structure, while the buoyancy structure, submerged in water, provides buoyancy support. The compartments inside the buoyancy structure house ballast equipment, and by adjusting the ballast load, the water depth of the main body of the transport device can be precisely controlled, ensuring the water level is always maintained at the optimal hydrodynamic position of the connecting structure. This catamaran architecture allows the main body of the transport device to be completely detached from the water surface, avoiding the large-area frictional resistance caused by direct contact between the main body and the water. Simultaneously, the combination of the buoyancy and connecting structures provides sufficient buoyancy and structural stability, enabling the liquid hydrogen transport device to navigate efficiently and smoothly under various load conditions.

[0007] Preferably, the number of buoyancy structures is at least two, and each of the buoyancy structures is located at the same height.

[0008] In this design, a symmetrical layout with at least two buoyancy structures at the same height is employed, providing stable multi-point support for the main body of the transport device on the water surface. This effectively suppresses the rolling and pitching of the transport device during navigation, significantly improving the stability and safety of the journey. The multi-buoyancy structure design also distributes the weight of the transport device, reducing the load on individual buoyancy structures and allowing for a more compact and lightweight design.

[0009] Preferably, the ballast equipment in the compartment is detachable so that the water level of the liquid hydrogen transport device is located on the connecting structure; the horizontal cross-sectional area of ​​the connecting structure is smaller than the horizontal cross-sectional area of ​​the main body of the transport device and the horizontal cross-sectional area of ​​the buoyancy structure.

[0010] In this design, the water level is controlled at the connection structure with the smallest horizontal cross-section. The reduced horizontal cross-sectional area of ​​the connection structure minimizes the water resistance area of ​​the moving parts in the water, further reducing navigation resistance. Simultaneously, the slender cross-sectional shape of the connection structure naturally creates a streamlined profile, reducing shape drag and eddy current losses as water flows through it. The reduced cross-sectional area of ​​the connection structure also lightens its weight, improving the overall load-bearing efficiency of the transport device. Controlling the water level at the connection structure location prevents accelerated corrosion of this critical area due to alternating wet and dry conditions, and ensures a more reasonable water pressure distribution at the connection area between the transport device and the liquid cargo tank, promoting long-term safe operation of the structure.

[0011] Preferably, the horizontal cross-sectional area of ​​the connecting structure gradually increases at the beginning along the water flow direction and gradually decreases at the end along the direction of water flow away. The horizontal cross-sectional area of ​​the middle section is consistent, and the two ends of the middle section are connected to the beginning and the end respectively.

[0012] In this design, the connecting structure adopts a streamlined cross-section design with a gradually expanding head, a gradually narrowing tail, and a consistent middle section. This allows water to flow smoothly along the surface upon contact with the connecting structure. The gradually expanding head guides the water to gradually wrap around the structural surface, avoiding impact separation, while the gradually narrowing tail allows the water to converge smoothly, eliminating tail eddies. The uniform cross-section region in the middle section provides a stable load-bearing section, optimizing the overall hydrodynamic performance of the connecting structure.

[0013] Preferably, the buoyancy structure includes a cylindrical component and a conical component. The conical component includes a first conical component near the head of the liquid hydrogen transport device and a second conical component near the tail of the liquid hydrogen transport device. The conical component is connected to the end face of the cylindrical component. The length of the first conical component is greater than the length of the second conical component. The vertex of the conical component includes a chamfer.

[0014] In this design, the buoyancy structure employs a combination of a cylinder and conical components. The cylinder provides the primary drainage volume and buoyancy, while the conical components create streamlined transitions at both ends. The design of the first conical component being longer than the second conical component allows for smoother water flow guidance at the bow of the transport device, reducing wave drag. The chamfered apex of the conical components prevents flow separation and eddies caused by sharp edges, further reducing water resistance.

[0015] Preferably, the buoyancy structure includes a cylindrical component and a conical component, the conical component being connected to the end face of the cylindrical component, the cylindrical component having multiple chambers inside, each chamber accommodating ballast equipment, and the conical component including a second conical component near the tail of the liquid hydrogen transport device, the second conical component accommodating a motor of a power unit.

[0016] In this design, the cylindrical component has multiple independent chambers to house the ballast equipment, allowing for more flexible and precise ballast water allocation. Each chamber can be independently controlled to adapt to different load conditions. The motor of the power unit is located inside the conical component at the rear of the transport device, making full use of the internal space and achieving a compact power system layout. Furthermore, the motor's location in the water allows it to directly drive propellers and other propulsion devices, shortening the transmission path and improving propulsion efficiency.

[0017] Preferably, the height of the connecting structure is not less than 3 meters, and the ratio of the length of the connecting structure to the length of the buoyancy structure is in the range of 0.7 to 0.8.

[0018] In this design, the connection structure's height of no less than 3 meters ensures sufficient clearance between the main body of the transport device and the water surface, preventing the main body from contacting the water under wave conditions and effectively avoiding wave impact loads on the main body. The length ratio of the connection structure to the buoyancy structure is controlled within the range of 0.7 to 0.8, achieving an optimal balance between the center of gravity and hydrodynamic performance of the main body of the transport device. This ensures sufficient load-bearing length while avoiding the additional weight and resistance caused by an excessively long connection structure.

[0019] Preferably, a drive module is provided on the side of the buoyancy structure facing the tail of the transport device, and a power module connected to the drive module is provided at the tail of the main body of the transport device.

[0020] In this design, the drive module is located at the stern of the buoyancy-supported transport device, acting directly in the water, resulting in high propulsion efficiency and low noise. The power module is located at the stern of the main transport device, away from the water surface, facilitating maintenance and repair while avoiding the additional costs and weight associated with a watertight design. The connection path between the power module and the drive module is short, minimizing energy transfer loss and ensuring high overall system energy efficiency.

[0021] Preferably, the power module includes a diesel-hydrogen dual-fuel generator, a hydrogen fuel cell, and a storage battery. The power module is connected to a liquid storage tank on the main body of the transport device to collect the hydrogen evaporated from the liquid storage tank.

[0022] In this solution, the power module employs a hybrid power system consisting of a diesel-hydrogen dual-fuel generator, a hydrogen fuel cell, and a battery. It features multiple operating modes that can be flexibly switched according to navigation conditions. By collecting hydrogen naturally evaporated from the storage tank and using it as fuel for the fuel cell, waste is transformed into a valuable resource, reducing greenhouse gas emissions and improving energy efficiency. The battery, acting as an energy buffer, absorbs peak power demands and smooths load fluctuations, ensuring the generator set always operates within its high-efficiency range, significantly reducing the overall energy consumption and operating costs of the transportation system.

[0023] Preferably, the main body of the transport device further includes a deck structure, which is disposed at the bottom of the main body of the transport device and connected to the connecting structure.

[0024] In this design, the deck structure is positioned at the bottom of the main body of the transport unit as a load-bearing transition section with the connecting structure. This evenly transfers the gravity load of the main body of the transport unit to the connecting structure, avoiding stress concentration. The deck structure also creates a flat bottom mounting surface, simplifying the installation and positioning process of the connecting structure and improving construction accuracy and structural reliability.

[0025] Preferably, the interior of the deck structure further includes multiple cavities, which are configured to store materials and isolate empty compartments.

[0026] In this design, multiple cavities within the deck structure can serve as material storage spaces and isolation compartments, making full use of the unused space within the deck structure and improving space utilization. The isolation compartments also provide additional buoyancy reserves in the event of accidental water ingress, enhancing the unsinkability and anti-sinking capability of the main transport unit and effectively increasing its safety margin.

[0027] Preferably, the horizontal cross-sectional shape of the connecting structure is spindle-shaped, with the leading edge of the spindle located near the head of the liquid hydrogen transport device and the trailing edge located near the tail of the liquid hydrogen transport device.

[0028] In this design, the connecting structure adopts a spindle-shaped cross-section design, with the leading and trailing edges of the spindle facing the head and tail of the transport device, respectively, giving the connecting structure an optimal streamlined shape in water. The sharp angle of the leading edge of the spindle reduces the impact upon entering the water, while the smooth convergence of the trailing edge eliminates tail eddy current shedding, ensuring that the connecting structure generates almost no form drag when moving in water.

[0029] Preferably, the connecting structure extends in the same direction as the buoyancy structure.

[0030] In this design, the extension directions of the connecting structure and the buoyancy structure are aligned, ensuring that the forces acting on both in the water are aligned. This avoids an increase in the cross-sectional area in contact with the water surface due to angular deviation, which would increase water resistance and improve navigation efficiency and structural integrity.

[0031] Preferably, the main body of the transport device further includes a liquid storage tank and a support base. The liquid storage tank is spherical in shape, and the support base is disposed below the liquid storage tank. At least a portion of the liquid storage tank is accommodated in the support base, and the shape of the support base is adapted to the liquid storage tank.

[0032] In this design, a spherical storage tank is used to store liquid hydrogen. The sphere has the smallest surface area for the same volume, effectively reducing heat transfer area and liquid hydrogen evaporation loss. The contoured design of the support base fits snugly against the lower hemisphere of the storage tank, evenly distributing the weight of the tank to the main structure of the transport device and avoiding localized stress concentration. The design of the support base partially enclosing the storage tank ensures that the tank will not experience abnormal displacement or swaying in either the lateral or longitudinal directions due to the movement of the main body of the transport device. It also provides good limiting and fixing functions for the storage tank, improving its safety under navigation vibration environments.

[0033] Preferably, the main body of the transport device further includes a liquid storage tank and a support base. There are multiple liquid storage tanks, and the support base is provided in a one-to-one correspondence with each liquid storage tank.

[0034] In this design, the layout of multiple storage tanks allows for flexible configuration of the total liquid hydrogen storage capacity. Each storage tank has an independent support base, making the stress path of each tank clear and easy to define, facilitating structural design and strength verification. The multi-tank configuration also provides redundancy, ensuring that a failure in one storage tank will not affect the normal operation of other storage tanks.

[0035] Preferably, the main body of the transport device further includes a liquid storage tank and a support base, and the liquid storage tank has two layers along the height direction.

[0036] In this design, the storage tanks are arranged in two layers along the height, making full use of the vertical space of the main body of the transport device and achieving a larger liquid hydrogen storage capacity within a limited deck area.

[0037] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0038] The positive and progressive effects of this invention are as follows: By employing independent buoyancy and connecting structures, the main body of the transport unit is mounted on the buoyancy structure via the connecting structure, with the buoyancy structure submerged in water to provide buoyancy support. The compartments inside the buoyancy structure house ballast equipment, and by adjusting the ballast load, the water depth of the main body of the transport unit can be precisely controlled, ensuring the water level is always maintained at the optimal hydrodynamic position of the connecting structure. This catamaran architecture allows the main body of the transport unit to be completely detached from the water surface, avoiding the large-area frictional resistance caused by direct contact between the main body and the water. Simultaneously, the combination of the buoyancy and connecting structures provides sufficient buoyancy and structural stability, enabling the liquid hydrogen transport unit to navigate efficiently and smoothly under various load conditions. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of a liquid hydrogen transport device according to a preferred embodiment of the present invention.

[0040] Figure 2 This is a side view schematic diagram of a liquid hydrogen transport device according to a preferred embodiment of the present invention.

[0041] Figure 3 This is a cross-sectional schematic diagram of a buoyancy structure according to a preferred embodiment of the present invention.

[0042] Figure 4 This is a schematic diagram of the buoyancy structure and connection structure of a preferred embodiment of the present invention.

[0043] Figure 5 This is a side view of the buoyancy structure and connection structure according to a preferred embodiment of the present invention.

[0044] Figure 6 This is a schematic diagram of the connection structure according to a preferred embodiment of the present invention.

[0045] Figure 7 This is a schematic diagram of the liquid storage tank and support base according to a preferred embodiment of the present invention.

[0046] Explanation of reference numerals in the attached figures

[0047] Liquid hydrogen transport device 100; transport device body 1; storage tank 11; pipeline 111; support base 12; spherical groove 121; buoyancy structure 2; compartment 21; cylindrical component 22; conical component 23; first conical component 231; second conical component 232; chamfer 233; connecting structure 3; bow end 31; stern end 32; intermediate section 33; deck structure 4; Detailed Implementation

[0048] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0049] like Figures 1-2 As shown, this embodiment provides a liquid hydrogen transport device 100, which includes a transport device body 1, a buoyancy structure 2 and a connecting structure 3. The buoyancy structure 2 is disposed at the lower part of the transport device body 1 and is connected to the transport device body 1 through the connecting structure 3. The buoyancy structure 2 is used to enter the water body. The buoyancy structure 2 has a compartment 21 inside, which is configured to accommodate ballast equipment to adjust the water entry depth of the liquid hydrogen transport device 100.

[0050] In this embodiment, by setting up an independent buoyancy structure 2 and a connecting structure 3, the main body of the transport device 1 is mounted on the buoyancy structure 2 via the connecting structure 3. The buoyancy structure 2 is submerged in water to provide buoyancy support. The compartment 21 inside the buoyancy structure 2 houses the ballast equipment. By adjusting the ballast load, the water depth of the main body of the transport device can be precisely controlled, ensuring that the water level is always maintained at the optimal hydrodynamic position of the connecting structure 3. This catamaran architecture allows the main body of the transport device 1 to be completely detached from the water surface, avoiding the large-area frictional resistance caused by direct contact between the main body and the water. At the same time, the combination of the buoyancy structure 2 and the connecting structure 3 provides sufficient buoyancy and structural stability, enabling the liquid hydrogen transport device 100 to navigate efficiently and smoothly under various load conditions.

[0051] Specifically, in this embodiment, the transportation device is a transport ship, and the following description will use a transport ship as an example. Figures 3-4As shown, in this embodiment, the liquid hydrogen transport device 100 has at least two buoyancy structures 2, all located at the same height. The ballast equipment in the compartment 21 is loadable and detachable, so that the water level of the liquid hydrogen transport device 100 is located on the connecting structure 3. The horizontal cross-sectional area of ​​each connecting structure 3 is smaller than the horizontal cross-sectional area of ​​the transport device body 1 and the horizontal cross-sectional area of ​​the buoyancy structure 2. By controlling the water level at the connecting structure 3 with the smallest horizontal cross-sectional area, the water resistance area of ​​the moving parts in the water can be minimized, thereby further reducing navigation resistance. At the same time, the connecting structure 3, due to its slender cross-section, naturally forms a streamlined profile, which can effectively reduce the shape resistance and eddy current loss when water flows through it. The reduction in its cross-sectional area also reduces the structural weight, which helps to improve the overall load-bearing efficiency of the ship. In addition, limiting the water level to the location of the connecting structure 3 can prevent the critical part from being accelerated by alternating wet and dry conditions, and make the connection area between the hull and the liquid cargo tank in a more reasonable water pressure distribution state, thereby ensuring the long-term safe operation of the structure.

[0052] like Figures 3-5 As shown, the connecting structure 3 is along the water flow direction (e.g. Figure 5As shown by arrow A in the diagram, the horizontal cross-sectional area of ​​the first end 31 gradually increases towards the tail end 32. Along the direction of water flow departure, the horizontal cross-sectional area of ​​the tail end 32 gradually decreases. The horizontal cross-sectional area of ​​the middle section 33 is uniform, and its two ends connect to the first end 31 and the tail end 32, respectively. The gradually expanding design of the first end 31 of the connecting structure 3 guides the water flow to gradually envelop the structure surface, effectively avoiding water flow impact and separation. The gradually contracting design of the tail end 32 promotes smooth water flow convergence, eliminating tail vortices. The uniform cross-sectional area of ​​the middle section 33 provides a stable load-bearing section, thus enabling the connecting structure 3 as a whole to achieve optimal hydrodynamic performance. The buoyancy structure 2 includes a cylindrical component 22 and a conical component 23. The conical component 23 includes a first conical component 231 near the bow of the liquid hydrogen transport device 100 and a second conical component 232 near the stern of the liquid hydrogen transport device 100. The conical component 23 is connected to the end face of the cylindrical component 22. The length of the first conical component 231 is greater than the length of the second conical component 232. The second conical component 232 is shorter to accommodate the installation of the power module, while the first conical component 231 is longer to accommodate the installation of the power module. To make the inlet flow line smoother and reduce water resistance, the apex of the conical member 23 includes a chamfer 233. The chamfer 233 at the apex of the conical member 23 avoids flow separation and eddies caused by sharp edges, further reducing water resistance. The cylindrical member 22 has multiple chambers inside, which are distributed sequentially along the axis of the cylindrical member 22. Each chamber has the same volume and houses ballast equipment. The second conical member 232 houses the motor of the power equipment. The cylindrical member 22 is 75 meters long and 12 meters in diameter. A single hull can provide a displacement of approximately 10,000 tons, and the two cylinders together can provide a displacement of approximately 20,000 tons. The height of the connecting structure 3 is not less than 3 meters, and the ratio of the length of the connecting structure 3 to the length of the buoyancy structure 2 is in the range of 0.7 to 0.8.

[0053] In other embodiments, the cylindrical component 22 may be of other sizes, and the two ends of the cylindrical component 22 may be connected to other components besides the conical component 23, such as a hemispherical structure or other structure that guides water flow. The number of buoyancy structures 2 may be more than two, which will not be described in detail here.

[0054] A drive module is located on the stern side of the buoyancy structure 2, and a power module connected to the drive module is located at the stern of the main body of the transport device 1. The power module includes a diesel-hydrogen dual-fuel generator, a hydrogen fuel cell, and a battery. The power module is connected to the liquid storage tank 11 on the main body of the transport device 1 to collect the hydrogen evaporated from the liquid storage tank 11. The main body of the transport device 1 also includes a deck structure 4, which is located at the bottom of the main body of the transport device 1 and connected to the connecting structure 3. The interior of the deck structure 4 includes multiple cavities, which are configured to store materials and isolate empty compartments. The horizontal cross-sectional shape of the connecting structure 3 is spindle-shaped, with the leading edge of the spindle located near the bow of the liquid hydrogen transport device 100 and the trailing edge located near the stern of the liquid hydrogen transport device 100; the connecting structure 3 extends in the same direction as the buoyancy structure 2.

[0055] In other embodiments, the power module may also adopt other combination modes, or it may use a diesel-hydrogen dual-fuel generator, a hydrogen fuel cell or a battery alone. The horizontal cross-sectional shape of the connection structure 3 may also be other shapes with low water resistance, which will not be described in detail here.

[0056] like Figures 1-7 As shown, the main body 1 of the transport unit is arranged sequentially from bow to stern, including a living quarters module, a cargo hold area, and a mechanical power area. The main body 1 also includes a liquid storage tank 11 and a support base 12. The liquid storage tank 11 is spherical in shape, and the support base 12 is located below the liquid storage tank 11. At least a portion of the liquid storage tank 11 is housed within the support base 12. The shape of the support base 12 is adapted to the liquid storage tank 11. A spherical groove 121 is provided on the side of the support base 12 facing the liquid storage tank 11. Each liquid storage tank 11 has a single compartment capacity of approximately 2000 cubic meters, and the total capacity of the entire ship can reach 20000 cubic meters. The liquid storage tank 11 is a double-walled vacuum liquid tank; double-walled vacuum liquid tanks are existing technology and will not be described in detail here. There are multiple liquid storage tanks 11, with each support base 12 corresponding to one of the liquid storage tanks 11. Along the vertical direction, the liquid storage tanks 11 are arranged in two layers. Each layer of liquid storage tanks 11 has two rows arranged along the width direction of the main body 1 of the transport device. The supporting bases 12 corresponding to two adjacent liquid storage tanks 11 along the width direction of the main body 1 of the transport device are integrally set. The upper and lower layers of liquid storage tanks 11 are supported by the supporting bases 12 of the upper liquid storage tanks 11. Each liquid storage tank 11 is equipped with a pipe 111 for loading and unloading liquid hydrogen. Multiple pipes 111 converge into the main loading and unloading pipe, and a shore connection is provided in the ship.

[0057] In other embodiments, the arrangement of the liquid storage tanks 11 can also be in other modes, such as multiple layers other than two layers along the height direction, multiple rows other than two rows along the width direction, and the shape of the liquid storage tanks 11 can be set to other forms other than spheres, such as elliptical or capsule-shaped, to adapt to different transportation needs, which will not be elaborated here.

[0058] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A liquid hydrogen transport device, characterized in that, It includes a main body of the transport device, a buoyancy structure, and a connecting structure. The buoyancy structure is located at the lower part of the main body of the transport device and is connected to the main body of the transport device through the connecting structure. The buoyancy structure is used to enter the water body. The buoyancy structure has a compartment inside, which is configured to accommodate ballast equipment to adjust the water inlet depth of the liquid hydrogen transport device.

2. The liquid hydrogen transport device as described in claim 1, characterized in that, The number of buoyancy structures is at least two, and each of the buoyancy structures is located at the same height; And / or, the ballast equipment in the compartment is detachable so that the water level of the liquid hydrogen transport device is located on the connecting structure; the horizontal cross-sectional area of ​​the connecting structure is smaller than the horizontal cross-sectional area of ​​the main body of the transport device and the horizontal cross-sectional area of ​​the buoyancy structure; And / or, along the water flow direction, the horizontal cross-sectional area of ​​the connecting structure gradually increases from the beginning to the end, and along the direction of water flow away, the horizontal cross-sectional area of ​​the end gradually decreases, the horizontal cross-sectional area of ​​the middle section is consistent, and the two ends of the middle section are respectively connected to the beginning and the end.

3. The liquid hydrogen transport device as described in claim 1, characterized in that, The buoyancy structure includes a cylindrical component and a conical component. The conical component includes a first conical component near the head of the liquid hydrogen transport device and a second conical component near the tail of the liquid hydrogen transport device. The conical component is connected to the end face of the cylindrical component. The length of the first conical component is greater than the length of the second conical component. The vertex of the conical component includes a chamfer. And / or, the buoyancy structure includes a cylindrical component and a conical component, the conical component being connected to the end face of the cylindrical component, the cylindrical component having multiple chambers inside, each of the chambers accommodating ballast equipment, and the conical component including a second conical component near the tail of the liquid hydrogen transport device, the second conical component having a motor of a power unit inside.

4. The liquid hydrogen transport device as described in claim 1, characterized in that, The height of the connecting structure is not less than 3 meters, and the ratio of the length of the connecting structure to the length of the buoyancy structure is in the range of 0.7 to 0.

8.

5. The liquid hydrogen transport device as described in claim 1, characterized in that, A drive module is provided on the side of the buoyancy structure facing the tail, and a power module connected to the drive module is provided at the tail of the main body of the transport device.

6. The liquid hydrogen transport device as described in claim 5, characterized in that, The power module includes a diesel-hydrogen dual-fuel generator, a hydrogen fuel cell, and a storage battery. The power module is connected to a liquid storage tank on the main body of the transport device to collect the hydrogen gas evaporated from the liquid storage tank.

7. The liquid hydrogen transport device as described in claim 1, characterized in that, The main body of the transport device also includes a deck structure, which is located at the bottom of the main body of the transport device and connected to the connecting structure.

8. The liquid hydrogen transport device as described in claim 7, characterized in that, The interior of the deck structure also includes multiple cavities, which are configured to store materials and isolate empty compartments.

9. The liquid hydrogen transport device as claimed in claim 1, characterized in that, The horizontal cross-sectional shape of the connecting structure is spindle-shaped, with the leading edge of the spindle located near the head of the liquid hydrogen transport device and the trailing edge of the spindle located near the tail of the liquid hydrogen transport device. And / or, the connecting structure extends in the same direction as the buoyancy structure.

10. The liquid hydrogen transport device as claimed in claim 1, characterized in that, The main body of the transport device also includes a liquid storage tank and a support base. The liquid storage tank is spherical in shape, and the support base is disposed below the liquid storage tank. At least a portion of the liquid storage tank is housed in the support base, and the shape of the support base is adapted to the liquid storage tank. And / or, there are multiple liquid storage tanks, and the support base is provided in a one-to-one correspondence with each liquid storage tank; And / or, along the height direction, the liquid storage tank is provided with two layers.

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