Liquefied natural gas (LNG) transportation filling ship cargo hold

Abstract

The invention relates to the technical field of cargo holds of transport ships, and discloses an LNG (Liquefied Natural Gas) transport filling ship cargo hold which comprises a cargo ship main body, a butt-joint bolt plate is fixedly connected to the top of the cargo ship main body, a spherical cargo hold groove is formed in the butt-joint bolt plate, and a spherical cargo hold is movably sleeved with the spherical cargo hold groove; the top of the spherical cargo hold is movably connected with a semicircular protective cover, the top of the semicircular protective cover is fixedly connected with a top cover valve, the interior of the top cover valve is fixedly connected with a top cover pipeline, the exterior of the top cover pipeline is movably connected with a butt joint pipeline, and the exterior of the butt joint pipeline is fixedly connected with a U-shaped pipeline. The telescopic clamping blocks are driven by means of the gear butt joint rings, accurate butt joint of U-shaped pipelines is completed, the interference problem in the butt joint process is effectively avoided, the convenience of cargo hold maintenance is improved, the reliability of pipeline connection is ensured, and the dual requirements of an LNG transport ship for structural operation flexibility and pipeline connection stability are met.

Description

Technical Field

[0001] This invention relates to the field of cargo hold technology for transport ships, and more specifically to a cargo hold for an LNG transport and bunkering ship. Background Technology

[0002] The cargo hold of an LNG bunkering vessel is the core storage and operational area of ​​the vessel. It is mainly used to safely store liquid LNG in a cryogenic environment (usually -162°C) and to provide the basic conditions for subsequent transportation and bunkering operations to the recipient. The cargo hold must have extremely high thermal insulation performance to minimize LNG evaporation loss. At the same time, it is constructed with special materials that are resistant to low temperatures and corrosion. It is equipped with a complete pressure control, leakage monitoring and safety protection system to ensure the stable storage of LNG during long-distance sea transportation and to accurately and safely transport LNG to the target object through supporting bunkering pipelines, pumps and valves. It is a key facility connecting the maritime transportation and terminal bunkering links of the LNG industry chain.

[0003] While existing LNG bunkering vessels typically use U-shaped brackets on the top of spherical cargo holds for easy observation and control of the top cover valves, this design significantly hinders disassembly and maintenance, directly impacting the operator's experience. The U-shaped brackets are usually fixed to critical maintenance areas on the top of the spherical cargo hold, and their protruding frame structure creates obstructions during disassembly. This obstructs the operator's ability to assemble and disassemble the cargo hold's top cover connecting components and sealing structures, requiring additional tool adjustments or removal of the brackets themselves, thus extending maintenance time. Furthermore, the curvature of the spherical cargo hold surface and the close fit of the U-shaped brackets can cause interference between maintenance tools and the brackets, increasing operational difficulty and even posing a risk of tools hitting and damaging the cargo hold surface.

[0004] In daily navigation, the spherical cargo holds of existing LNG bunkering vessels are easily damaged by the turbulence caused by waves, significantly affecting operational safety. During navigation, the irregular impact of waves causes the hull to undulate and roll. Since the docking points between the spherical cargo holds and the hull are mostly rigidly connected, when the hull is violently rocked, the docking points will experience direct rigid impacts due to the difference in the amplitude of the movement. This impact force will continuously act on the docking welds, sealing components, and supporting structures of the cargo holds, which can easily lead to damage to the cargo holds and affect the user experience of the equipment. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a cargo hold for an LNG transport bunkering vessel to solve the problems existing in the background art.

[0006] The present invention provides the following technical solution: an LNG carrier cargo hold, comprising a cargo ship hull, a docking bolt plate fixedly connected to the top of the cargo ship hull, a spherical cargo hold groove opened inside the docking bolt plate, a spherical cargo hold movably fitted inside the spherical cargo hold groove, a semi-circular protective cover movably connected to the top of the spherical cargo hold, a top cover valve fixedly connected to the top of the semi-circular protective cover, a top cover pipe fixedly connected inside the top cover valve, a docking pipe movably connected to the outside of the top cover pipe, and a U-shaped pipe fixedly connected to the outside of the docking pipe.

[0007] Furthermore, a bracket support is fixedly connected to the top of the cargo ship's main body, a T-shaped insert is movably sleeved inside the bracket support, a pipe sleeve is fixedly connected to the top of the T-shaped insert, a bracket hanging ring is fixedly connected to the outside of the pipe sleeve, and a U-shaped pipe is movably sleeved inside the pipe sleeve.

[0008] Furthermore, a U-shaped bracket plate is fixedly connected to the top of the pipe sleeve, a frame plate support is movably connected to the outside of the U-shaped bracket plate, a gear mating ring is movably connected inside the frame plate support, a threaded connecting pipe is movably engaged inside the gear mating ring, a U-shaped pipe is movably sleeved inside the threaded connecting pipe, and a telescopic clamp is provided on the outside of the U-shaped pipe.

[0009] Furthermore, the outer surface of the semi-circular protective cover is fixedly connected to a top cover hanging ring, the outer surface of the semi-circular protective cover is fixedly connected to a bolt connecting ring, the inner surface of the bolt connecting ring is movably fitted with a fixing bolt, and the bottom of the fixing bolt is movably connected to a spherical ring plate.

[0010] Furthermore, the top of the semi-circular protective cover is fixedly connected to a valve shaft, and the valve shaft is movably sleeved with a top valve piston. The bottom of the top valve piston is provided with a pressing upper impact post.

[0011] Furthermore, a positioning pin is fixedly connected to the bottom of the spherical cargo hold, a positioning slot is provided at the bottom of the positioning pin, a cargo hold tray is provided outside the positioning slot, and a tray spring is fixedly connected to the bottom of the cargo hold tray.

[0012] Furthermore, the bottom of the upper extrusion impact column is provided with an upper pipe valve, the upper pipe valve is movably sleeved with the lower extrusion impact column, the bottom of the lower extrusion impact column is fixedly connected to a closed circular plate, the top of the closed circular plate is fixedly connected to a protruding sealing ring, the outside of the closed circular plate is fixedly connected to a movable slider, the outside of the movable slider is provided with a slide groove, the bottom of the closed circular plate is fixedly connected to an anti-corrosion spring, and the bottom of the anti-corrosion spring is fixedly connected to a spring base.

[0013] Furthermore, the upper pipeline valve is internally connected to an infusion pipeline, the bottom of the infusion pipeline is fixedly connected to a lower pipeline valve, the bottom of the lower pipeline valve is fixedly connected to a ball valve, the outside of the ball valve is fixedly connected to a valve motor, and the bottom of the ball valve is fixedly connected to a piston pipeline.

[0014] Furthermore, a pneumatic piston is movably sleeved inside the piston pipe, a motor rotating plate is movably connected to the outside of the pneumatic piston, a drive motor is fixedly connected to the outside of the piston pipe, and a power blade is movably connected inside the drive motor.

[0015] The technical effects and advantages of this invention are as follows:

[0016] 1. This invention achieves convenient assembly and disassembly of the U-shaped bracket plate through the sleeve connection between the bracket support and the T-shaped insert, avoiding obstruction during the disassembly and maintenance of the spherical cargo hold and ensuring smooth operation. At the same time, the telescopic clamp is driven by the gear docking ring to complete the precise docking of the U-shaped pipe, effectively avoiding interference problems during the docking process. This not only improves the convenience of cargo hold maintenance but also ensures the reliability of the pipe connection, meeting the dual requirements of LNG carriers for structural operational flexibility and pipe connection stability.

[0017] 2. This invention, by installing a semi-circular protective cover on the top of the spherical cargo hold and combining it with the docking design of the upper pipeline valve and the top cover valve, facilitates the operator's control of the upper pipeline valve opening and closing, enabling the discharge and injection of liquid or gas pressure inside the spherical cargo hold. At the same time, a cargo hold support plate is set at the bottom of the spherical cargo hold, providing stable support for the cargo hold and bearing the main weight load. The support plate spring at the bottom of the cargo hold support plate can absorb the impact force generated by the ship's turbulence through elastic deformation, buffering the rigid impact between the cargo hold support plate and the spherical cargo hold. This ensures both the convenience of media transportation operations and improves the stability and safety of the cargo hold during navigation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the U-shaped bracket plate structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the shelf support structure of the present invention.

[0021] Figure 4 This is a schematic diagram of the semi-circular protective cover structure of the present invention.

[0022] Figure 5 This is a schematic diagram of the spherical cargo hold structure of the present invention.

[0023] Figure 6 This is a schematic diagram of the upper pipeline valve structure of the present invention.

[0024] Figure 7 This is a schematic diagram of the spherical cargo hold structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the piston pipe structure of the present invention.

[0026] Figure 9 This is a schematic diagram of the drive motor structure of the present invention.

[0027] The attached diagram is labeled as follows: 1. Cargo ship hull; 2. Docking bolt plate; 3. Spherical cargo hold trough; 4. Spherical cargo hold; 5. Semi-circular protective cover; 6. Top cover valve; 7. Top cover pipe; 8. Docking pipe; 9. U-shaped pipe; 101. Bracket support; 102. T-shaped insert; 103. Pipe sleeve; 104. Bracket hanging ring; 201. U-shaped bracket plate; 202. Bracket support platform; 203. Gear docking ring; 204. Threaded butt joint pipe; 205. Telescopic clamp; 301. Top cover hanging ring; 302. Bolt connection ring; 303. Fixing bolt; 304. Spherical ring plate; 401. Valve shaft; 40 2. Top valve piston; 403. Upper extrusion impact post; 501. Lower extrusion impact post; 502. Closed circular plate; 503. Slide groove; 504. Raised sealing ring; 505. Movable slider; 506. Corrosion-resistant spring; 507. Spring base; 508. Upper pipeline valve; 601. Infusion pipeline; 602. Lower pipeline valve; 603. Ball valve; 604. Valve motor; 605. Piston pipeline; 701. Positioning insert; 702. Positioning slot; 703. Cargo hold pallet; 704. Pallet spring; 801. Pneumatic piston; 802. Motor rotating plate; 803. Drive motor; 804. Power blade. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. The LNG transport bunkering ship cargo tank involved in the present invention is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Reference Figure 1-9This invention provides a cargo hold for an LNG bunkering vessel, comprising a cargo ship hull 1, a docking bolt plate 2 fixedly connected to the top of the cargo ship hull 1, a spherical cargo hold groove 3 inside the docking bolt plate 2, a spherical cargo hold 4 movably fitted inside the spherical cargo hold groove 3, a semi-circular protective cover 5 movably connected to the top of the spherical cargo hold 4, a top cover valve 6 fixedly connected to the top of the semi-circular protective cover 5, a top cover pipe 7 fixedly connected inside the top cover valve 6, a docking pipe 8 movably connected to the outside of the top cover pipe 7, and a U-shaped pipe 9 fixedly connected to the outside of the docking pipe 8. By embedding the spherical cargo hold 4 into the spherical cargo hold groove 3, the curved surface fit between the groove and the cargo hold effectively prevents the cargo hold from rolling. Meanwhile, the connection between the spherical ring plate 304 and the docking bolt plate 2 further enhances the installation stability of the spherical cargo tank 4, adapting to the turbulent environment during ship navigation. The semi-circular protective cover 5 on the top of the spherical cargo tank 4 can provide physical protection for the cargo tank, reducing the impact of external factors on the cargo tank. The top cover valve 6 serves as the control core, achieving a sealed connection with the docking pipe 8 through the internal top cover pipe 7. Finally, the LNG liquid or gas inside the spherical cargo tank 4 is safely transported through the U-shaped pipe 9. This pipeline design facilitates the discharge and filling of the medium, and can quickly cut off the transport path through the valve, improving operational safety and meeting the transportation requirements of low-temperature and high-pressure media such as LNG.

[0030] In a preferred embodiment, a bracket support column 101 is fixedly connected to the top of the cargo ship hull 1. A T-shaped insert 102 is movably sleeved inside the bracket support column 101. A pipe sleeve 103 is fixedly connected to the top of the T-shaped insert 102. A bracket hanging ring 104 is fixedly connected to the outside of the pipe sleeve 103. A U-shaped pipe 9 is movably sleeved inside the pipe sleeve 103. This facilitates the stable fixing of the pipe sleeve 103 to the bottom of the U-shaped bracket plate 201 through the sleeved cooperation between the bracket support column 101 and the T-shaped insert 102, forming a reliable support for the U-shaped bracket plate 201 and enhancing the load-bearing capacity of the overall structure. The U-shaped pipe 9 sleeved inside the pipe sleeve 103 not only fixes and limits the U-shaped pipe 9, reducing fatigue damage caused by pipe shaking during ship navigation, but also does not affect the normal transport function of the pipe. At the same time, the bracket hanging ring 104 installed on the outside of the pipe sleeve 103 is designed to facilitate the overall lifting and disassembly of the U-shaped bracket plate 201 using cranes or other equipment. This detachable structure allows for the quick removal of brackets and piping components when maintenance or dismantling of the spherical cargo hold 4 is required, preventing them from obstructing cargo hold operations, improving the convenience and efficiency of equipment maintenance, and adapting to the special operational needs of LNG carrier cargo holds.

[0031] In a preferred embodiment, a U-shaped bracket plate 201 is fixedly connected to the top of the pipe sleeve 103. A frame plate support 202 is movably connected to the outside of the U-shaped bracket plate 201. A gear coupling ring 203 is movably connected inside the frame plate support 202. A threaded connecting pipe 204 is movably engaged inside the gear coupling ring 203. The U-shaped pipe 9 is movably sleeved inside the threaded connecting pipe 204. A telescopic clamp 205 is provided on the outside of the U-shaped pipe 9. This facilitates the rotation of the gear coupling ring 203 by a motor inside the frame plate support 202 during the installation of the U-shaped bracket plate 201, utilizing gear meshing. The principle involves screwing in and fixing the threaded connecting pipe 204, which is sleeved on the outside of the U-shaped pipe 9, to achieve a precise connection between the pipe and the bracket. Simultaneously, the telescopic clamp 205 on the outside of the U-shaped pipe 9 provides rigid clamping for the threaded connecting pipe 204 during the connection process, effectively preventing it from rotating synchronously with the gear engagement ring 203. This ensures smooth thread engagement, guaranteeing both the sealing and robustness of the pipe connection. Furthermore, the combination of mechanical linkage and clamping positioning improves the efficiency and accuracy of pipe installation, meeting the high sealing requirements of LNG carriers and facilitating subsequent maintenance and disassembly. The integrated structure of the U-shaped bracket plate 201 and the pipe sleeve 103 also enhances the overall support strength, reducing vibration and displacement of the pipe during ship navigation.

[0032] In a preferred embodiment, the semicircular protective cover 5 is externally fixedly connected to a top cover hanging ring 301, and externally fixedly connected to a bolt connecting ring 302. The bolt connecting ring 302 is internally movably fitted with a fixing bolt 303, and the bottom of the fixing bolt 303 is movably connected to a spherical ring plate 304. This facilitates the installation and removal of the protective cover through the top cover hanging ring 301 installed on the outside of the semicircular protective cover 5, allowing the semicircular protective cover 5 to be quickly lifted or placed using equipment such as cranes. This facilitates internal inspection and maintenance of the spherical cargo hold 4. The fixing bolt 303 passes through the holes in the bolt connecting ring 302 and the spherical ring plate 304 and is tightened to form a rigid connection between the semicircular protective cover 5 and the spherical cargo hold 4, indirectly and securely restraining the spherical cargo hold 4 inside the spherical cargo hold trough 3. This bolted connection method not only enhances the stability of the spherical cargo hold 4 during ship navigation and effectively resists turbulence and impact, but also ensures the sealing performance of the cargo hold top, meeting the stringent requirements for container sealing in LNG transportation and improving the safety and reliability of the overall structure.

[0033] In a preferred embodiment, a valve shaft 401 is fixedly connected to the top of the semi-circular protective cover 5. A top valve piston 402 is movably sleeved inside the valve shaft 401. The bottom of the top valve piston 402 is equipped with a pressing upper impact column 403, which facilitates the extension and retraction of the top valve piston 402 by rotating the valve shaft 401, directly controlling the on / off state of the top cover pipe 7 and achieving primary control of LNG medium transportation. Simultaneously, the pressing upper impact column 403 at the bottom of the top valve piston 402 can be linked with a corresponding pressing lower impact column 501. When the top valve piston 402 extends or retracts, the pressing upper impact column 403 mechanically compresses and drives the pressing lower impact column 501, thereby controlling the opening and closing state of the upper pipe valve 508. This dual valve control design achieves graded control of the transportation pipeline, improving operational safety, and ensures the synchronization and reliability of valve actions through mechanical linkage. This meets the high-precision requirements for pipeline opening and closing control during the transportation of high-risk media such as LNG, effectively preventing safety hazards such as medium leakage. The rotation operation of valve shaft 401 also makes it easy for operators to accurately control the opening and closing degree, meeting the flow regulation needs under different working conditions.

[0034] In a preferred embodiment, a positioning pin 701 is fixedly connected to the bottom of the spherical cargo hold 4. A positioning slot 702 is provided at the bottom of the positioning pin 701, and a cargo hold support plate 703 is provided outside the positioning slot 702. A support plate spring 704 is fixedly connected to the bottom of the cargo hold support plate 703. This facilitates the precise engagement of the positioning pin 701 and the positioning slot 702, forming a circumferential limiting mechanism. This effectively prevents the spherical cargo hold 4 from rotating or shifting during ship navigation, ensuring the relative stability of the cargo hold and components such as pipeline interfaces. The cargo hold support plate 703 at the bottom of the spherical cargo hold 4 provides stable support for the cargo hold and bears the main weight load. The support plate spring 704 installed at its bottom can absorb the impact force generated by ship turbulence through elastic deformation, buffering the rigid impact between the cargo hold support plate 703 and the spherical cargo hold 4, reducing the impact of vibration on the cargo hold structure and the internal LNG medium. This protects the cargo hold body and reduces the risk of interface loosening and leakage caused by vibration, further improving the stability and safety of the spherical cargo hold 4 installation.

[0035] In a preferred embodiment, an upper pipe valve 508 is provided at the bottom of the upper extrusion column 403. The upper pipe valve 508 is movably sleeved with the lower extrusion column 501. The bottom of the lower extrusion column 501 is fixedly connected to a closed circular plate 502. The top of the closed circular plate 502 is fixedly connected to a protruding sealing ring 504. The outside of the closed circular plate 502 is fixedly connected to a movable slider 505. A slide groove 503 is provided on the outside of the movable slider 505. The bottom of the closed circular plate 502 is fixedly connected to an anti-corrosion spring 506. The bottom of the anti-corrosion spring 506 is fixedly connected to a spring base 507. This facilitates the precise opening and closing of the pipeline through mechanical linkage: when the lower extrusion column 501 is extruded, it will drive the closed circular plate 502 to move down synchronously. The movable slider 505 on its outside slides smoothly along the track of the slide groove 503, ensuring accurate movement trajectory. At this point, the raised sealing ring 504 on the top of the closed circular plate 502 disengages from the inner wall of the upper pipeline valve 508, forming a flow channel to facilitate the transport of LNG liquid or gas through the delivery pipeline 601. When the pressure on the lower impact column 501 loses external force, the anti-corrosion spring 506 on the top of the spring base 507 releases its elastic potential energy, pushing the closed circular plate 502 upward, causing the raised sealing ring 504 to re-fit tightly against the inner wall of the upper pipeline valve 508, thus achieving a sealed closure of the pipeline. This design ensures the reliability of valve opening and closing, and the anti-corrosion spring 506 adapts to the low temperature and corrosiveness of the LNG transportation environment. Simultaneously, the cooperation between the movable slider 505 and the slide groove 503 ensures the accuracy of the sealing ring engagement, effectively preventing media leakage and improving the safety of the pipeline system.

[0036] In a preferred embodiment, the upper pipeline valve 508 is internally movably connected to the infusion pipeline 601. The bottom of the infusion pipeline 601 is fixedly connected to the lower pipeline valve 602. The bottom of the lower pipeline valve 602 is fixedly connected to the ball valve 603. The outside of the ball valve 603 is fixedly connected to the valve motor 604. The bottom of the ball valve 603 is fixedly connected to the piston pipeline 605. This design facilitates precise control of media delivery through multi-stage valve control: the valve motor 604 can drive the ball valve 603 to rotate, realizing independent opening and closing of a single pipeline passage. This design effectively avoids the interference of air pressure fluctuations generated by the pneumatic piston 801 on multiple lower pipeline valves 602, ensuring that each delivery branch can be controlled independently to meet the needs of different filling or discharging conditions. The infusion pipeline 601 connects the upper pipeline valve 508 and the lower pipeline valve 602 to form a complete delivery path, and the piston pipeline 605 at the bottom can cooperate with the pneumatic piston 801 to realize the dynamic delivery of the media. The structural characteristics of the ball valve 603 give it excellent sealing and flow capacity, making it suitable for the transportation and control of cryogenic and high-pressure media such as LNG. The motor drive improves the convenience of valve operation and control accuracy, further ensuring the safety and reliability of pipeline system operation.

[0037] In a preferred embodiment, a pneumatic piston 801 is movably sleeved inside the piston pipe 605, a motor rotating plate 802 is movably connected to the outside of the pneumatic piston 801, and a drive motor 803 is fixedly connected to the outside of the piston pipe 605. A power blade 804 is movably connected inside the drive motor 803. This facilitates the achievement of dual functions through the linkage between the pneumatic piston 801 and the motor rotating plate 802: the motor rotating plate 802 can drive the pneumatic piston 801 to perform reciprocating piston motion inside the piston pipe 605, which can actively squeeze out any LNG liquid that may leak into the pipe. The pressure collection prevents the leakage liquid from accumulating and causing safety hazards. On the other hand, the squeezed leakage liquid can be transported to the drive motor 803 as an auxiliary power source to provide driving energy for the internal power blades 804, realizing the resource utilization of the leakage medium. This not only strengthens the sealing and protection capability of the piston pipe 605 and reduces the risk of LNG leakage, but also improves the economy of the ship's power system through energy recovery. At the same time, the stable operation of the pneumatic piston 801 can also ensure the stability of the medium transportation in the piston pipe 605, which meets the dual requirements of safety and energy efficiency for LNG carriers.

[0038] The working principle of this invention: The cargo hold of the LNG bunkering vessel is embedded in a spherical cargo hold groove 3 via a spherical cargo hold 4. The curved surfaces of the groove and the cargo hold prevent rolling. A spherical annular plate 304 connects to the docking bolt plate 2, enhancing installation stability to withstand turbulence during navigation. A semi-circular protective cover 5 on top of the spherical cargo hold 4 provides physical protection, reducing external impacts. A top cover valve 6 serves as the control core, sealingly connecting to the docking pipe 8 via an internal top cover pipe 7, ultimately transporting LNG through a U-shaped pipe 9. This pipe design facilitates both medium filling and discharge, and allows for rapid path cutoff via valves, improving safety and meeting the requirements for transporting cryogenic and high-pressure media. A bracket support 101 and a T-shaped insert 102 are fitted together, fixing the pipe sleeve 103 to the bottom of the U-shaped bracket plate 201, forming reliable support and enhancing load-bearing capacity. The U-shaped pipe 9 is fitted inside the pipe sleeve 103, which can fix and limit the movement to reduce swaying fatigue damage without affecting the transportation. The external bracket hanging ring 104 makes it easy to lift and disassemble the whole with a crane. When maintaining the cargo hold, the bracket and pipe components can be quickly removed, improving the efficiency of operation.

[0039] During installation of the U-shaped bracket plate 201, the motor inside the bracket platform 202 drives the gear coupling ring 203 to rotate, and the threaded connecting pipe 204 outside the U-shaped pipe 9 is screwed in and fixed through gear meshing, achieving a precise connection. At the same time, the telescopic clamp 205 outside the U-shaped pipe 9 rigidly clamps the threaded connecting pipe 204, preventing it from rotating synchronously with the gear, ensuring that the threads are properly engaged, taking into account sealing, firmness, and installation efficiency, meeting high sealing requirements and facilitating maintenance. The integrated structure of the U-shaped bracket plate 201 and the pipe sleeve 103 also enhances the support strength and reduces pipe vibration displacement. The top cover hanging ring 301 on the outside of the semi-circular protective cover 5 provides an interface for disassembly and assembly, facilitating crane operation. The fixing bolt 303 passes through the bolt connecting ring 302 and the hole of the spherical ring plate 304 and is tightened, making the protective cover rigidly connected to the cargo hold, indirectly and securely restraining the cargo hold within the cargo hold slot, which not only enhances navigation stability and resistance to turbulence, but also ensures top sealing and improves overall safety.

[0040] Rotating the valve shaft 401 drives the top valve piston 402 to extend and retract, controlling the opening and closing of the top cover pipe 7 to achieve primary control. The upper extrusion pin 403 and the lower extrusion pin 501 at the bottom of the top valve piston 402 are linked, driving the upper pipe valve 508 to open and close. This dual control not only improves safety through graded regulation but also ensures synchronous and reliable operation through mechanical linkage, meeting the high-precision opening and closing requirements of high-risk media. The rotation of the shaft also facilitates precise flow adjustment. The positioning pin 701 and the positioning slot 702 fit together to prevent the cargo hold from rotating and shifting. The cargo hold support plate 703 bears the weight, and the bottom support plate spring 704 absorbs the impact of bumps and cushions rigid impacts, protecting the cargo hold and reducing the risk of loosening and leakage at the interface. When the lower extrusion pin 501 is under force, it drives the closing circular plate 502 to move downward, and the raised sealing ring 504 disengages from the upper pipe valve 508 to form a passage. After the external force disappears, the anti-corrosion spring 506 pushes the closing circular plate 502 upward to seal, balancing reliability and low-temperature corrosion resistance. In addition, the valve motor 604 drives the ball valve 603 to achieve independent opening and closing of a single passage. The infusion pipeline 601 connects the upper and lower pipeline valves to form a complete path. The pneumatic piston 801 assists in the delivery. The pneumatic piston 801 is linked with the motor rotating plate 802, which can collect leaked LNG and convert it into auxiliary power, taking into account both safety and energy efficiency.

[0041] Although the invention has been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these inventions without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

[0042] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change.

[0043] Secondly: The accompanying drawings of this invention only involve structures related to this invention. Other structures can be referred to with common designs. In the absence of conflict, the same invention and different inventions of this invention can be combined with each other.

[0044] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cargo hold for an LNG bunkering vessel, comprising the hull of the vessel (1), characterized in that: The top of the cargo ship body (1) is fixedly connected to a docking bolt plate (2). A spherical cargo hold groove (3) is opened inside the docking bolt plate (2). A spherical cargo hold (4) is movably connected inside the spherical cargo hold groove (3). A semi-circular protective cover (5) is movably connected to the top of the spherical cargo hold (4). A top cover valve (6) is fixedly connected to the top of the semi-circular protective cover (5). A top cover pipe (7) is fixedly connected inside the top cover valve (6). A docking pipe (8) is movably connected to the outside of the top cover pipe (7). A U-shaped pipe (9) is fixedly connected to the outside of the docking pipe (8).

2. The cargo hold of an LNG bunkering vessel according to claim 1, characterized in that: The top of the cargo ship body (1) is fixedly connected to a bracket support (101), the inside of the bracket support (101) is movably connected to a T-shaped insert (102), the top of the T-shaped insert (102) is fixedly connected to a pipe sleeve (103), the outside of the pipe sleeve (103) is fixedly connected to a bracket hanging ring (104), and the inside of the pipe sleeve (103) is movably connected to a U-shaped pipe (9).

3. The cargo hold of an LNG bunkering vessel according to claim 2, characterized in that: The top of the pipe sleeve (103) is fixedly connected to a U-shaped bracket plate (201), the outside of the U-shaped bracket plate (201) is movably connected to a frame plate support (202), the inside of the frame plate support (202) is movably connected to a gear docking ring (203), the inside of the gear docking ring (203) is movably engaged with a threaded connecting pipe (204), the inside of the threaded connecting pipe (204) is movably sleeved with a U-shaped pipe (9), and the outside of the U-shaped pipe (9) is provided with a telescopic clamp (205).

4. The cargo hold of an LNG bunkering vessel according to claim 1, characterized in that: The semicircular protective cover (5) is externally fixedly connected to the top cover hanging ring (301), the semicircular protective cover (5) is externally fixedly connected to the bolt connecting ring (302), the bolt connecting ring (302) is internally movably connected to the fixing bolt (303), and the bottom of the fixing bolt (303) is movably connected to the spherical ring plate (304).

5. The cargo hold of an LNG bunkering vessel according to claim 1, characterized in that: The top of the semi-circular protective cover (5) is fixedly connected to the valve shaft (401), and the valve shaft (401) is movably sleeved with the top valve piston (402). The bottom of the top valve piston (402) is provided with a squeezing upper impact column (403).

6. The cargo hold of an LNG bunkering vessel according to claim 1, characterized in that: The bottom of the spherical cargo hold (4) is fixedly connected to a positioning pin (701), the bottom of the positioning pin (701) is provided with a positioning slot (702), the outside of the positioning slot (702) is provided with a cargo hold tray (703), and the bottom of the cargo hold tray (703) is fixedly connected to a tray spring (704).

7. The cargo hold of an LNG bunkering vessel according to claim 5, characterized in that: The bottom of the extrusion upper impact column (403) is provided with an upper pipe valve (508), the upper pipe valve (508) is movably sleeved with the extrusion lower impact column (501), the bottom of the extrusion lower impact column (501) is fixedly connected with a closed circular plate (502), the top of the closed circular plate (502) is fixedly connected with a protruding sealing ring (504), the outside of the closed circular plate (502) is fixedly connected with a movable slider (505), the outside of the movable slider (505) is provided with a slide groove (503), the bottom of the closed circular plate (502) is fixedly connected with an anti-corrosion spring (506), and the bottom of the anti-corrosion spring (506) is fixedly connected with a spring base (507).

8. The cargo hold of an LNG bunkering vessel according to claim 7, characterized in that: The upper pipeline valve (508) is internally connected to the infusion pipeline (601), the bottom of the infusion pipeline (601) is fixedly connected to the lower pipeline valve (602), the bottom of the lower pipeline valve (602) is fixedly connected to the ball valve (603), the outside of the ball valve (603) is fixedly connected to the valve motor (604), and the bottom of the ball valve (603) is fixedly connected to the piston pipeline (605).

9. The cargo hold of an LNG bunkering vessel according to claim 8, characterized in that: The piston pipe (605) is internally fitted with a pneumatic piston (801), the pneumatic piston (801) is externally connected to a motor rotating plate (802), the piston pipe (605) is externally fixedly connected to a drive motor (803), and the drive motor (803) is internally connected to a power blade (804).

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