Moon pool structure of drilling ship

Abstract

The invention provides a moon pool structure of a drilling ship, and relates to the field of drilling ship equipment, the moon pool structure comprises a moon pool opening, a moon pool enclosure bulkhead and a moon pool bottom, and further comprises a flow guide buffer mechanism which is arranged on the inner side of the moon pool enclosure bulkhead in a surrounding mode and comprises a flow guide cover, a buffer plate and a hinge supporting assembly connected with the flow guide cover and the buffer plate; the sealing system is arranged on the periphery of the opening of the moon pool and comprises a sealing ring, a hydraulic actuator for driving the sealing ring and a sensor for sensing the height of waves; the telescopic protective fence is arranged on the edge of the opening of the moon pool and comprises a plurality of protective fence units, a telescopic mechanism for driving the protective fence units and a locking device. Wave impact is reduced through the flow guide buffering system, intelligent sealing adapts to different sea conditions, safe operation is ensured through telescopic protection, the structural service life is prolonged through the vibration suppression device, the working face is stabilized through the hydraulic compensation platform, the emergency system quickly responds to emergency situations, and the operation safety and operation efficiency of the drilling ship are comprehensively improved.

Description

Technical Field

[0001] This invention relates to the field of drilling vessel equipment, and more particularly to a moon pool structure for a drilling vessel. Background Technology

[0002] The moon pool on a drilling vessel is a critical operational channel in offshore oil and gas exploration and development, and its structural performance directly affects the safety and efficiency of drilling operations. Under complex marine environmental conditions, the moon pool must effectively cope with challenges such as wave impact, vortex-induced vibration, and seawater intrusion, providing a stable working environment for drill string deployment and retrieval. Due to the harsh offshore conditions and the high requirements for operational continuity, the moon pool structure must possess excellent fluid control capabilities, dynamic sealing performance, and safety protection functions.

[0003] Traditional drilling vessel moon pool structures generally suffer from limitations such as significant fluid disturbance and insufficient sealing reliability. Their flow guidance designs often employ fixed structures, which are ineffective in mitigating the impact of waves on the moon pool's interior, leading to significant vibration of the work platform. Sealing systems mostly use static sealing methods, which cannot adapt to gap fluctuations caused by wave changes, posing a risk of seal failure. Protective facilities are typically fixed railings, hindering the hoisting of large equipment and lacking adaptability. Furthermore, the lack of effective vortex-induced vibration suppression measures makes the moon pool walls susceptible to fatigue damage. In addition, the integration of emergency discharge functions is low, operational convenience is insufficient, and the lack of comprehensive lighting and monitoring systems is detrimental to operational safety at night or in harsh sea conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a drilling vessel moon pool structure to address the above-mentioned defects in the prior art.

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present invention provide a drilling vessel moon pool structure to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A moon pool structure for a drilling vessel includes: a moon pool opening, a moon pool enclosure wall, and a moon pool bottom, characterized in that it further includes: A flow guiding and buffering mechanism is arranged around the inner side of the moon pool enclosure wall, including a flow guiding hood, a buffer plate, and a hinged support assembly connecting the flow guiding hood and the buffer plate; A sealing system, disposed around the periphery of the moon pool opening, includes a sealing ring, a hydraulic actuator for driving the sealing ring, and a sensor for sensing wave height; A retractable guardrail, installed at the edge of the moon pool opening, includes multiple guardrail units, a telescopic mechanism that drives the guardrail units, and a locking device.

[0007] Preferably, the flow deflector comprises: The upper guide section has an arc-shaped cross-section and slopes towards the center of the moon pool; A vertical extension section, one end of which is connected to the end of the upper guide section; A flow channel is formed between the upper flow channel and the vertical extension channel.

[0008] Preferably, the buffer plate is connected to the flow guide via the hinged support assembly, the hinged support assembly comprising: Fixed support, connected to the moon pool enclosure wall; The swing arm is hinged at one end to the fixed support and at the other end to the buffer plate; An elastic damper is disposed between the swing arm and the fixed support.

[0009] Preferably, the inner side of the flow guide shroud is further provided with flow guide fins, the flow guide fins are arranged circumferentially at intervals and form an acute angle with the flow direction of the flow guide channel, an auxiliary channel is formed between adjacent flow guide fins, and the ends of the flow guide fins are bent towards the center of the moon pool.

[0010] Preferably, the sealing ring is composed of several sealing flaps, and a compression airbag is formed inside the sealing flap. The compression airbag is used to seal the gap formed between adjacent sealing flaps.

[0011] Preferably, the guardrail unit includes: The column is hollow inside; A horizontal bar is slidably installed inside the column; A linkage mechanism is used to connect adjacent horizontal bars.

[0012] Preferably, the bottom of the moon pool is also provided with a wave compensation platform, which is connected to the bottom of the moon pool by a hydraulic lifting column, and a flexible sealing skirt is provided between the periphery and the wall of the moon pool.

[0013] Preferably, a vortex-induced vibration suppressor is provided on the outer side of the moon pool enclosure wall. The vortex-induced vibration suppressor includes a spiral guide bar and a turbulence fin disposed at the end of the spiral guide bar. The spiral guide bar extends spirally along the outer periphery of the moon pool enclosure wall.

[0014] Preferably, the bottom of the moon pool is provided with an openable and closable emergency discharge door. The emergency discharge door is driven by a hydraulic push rod and is provided with a two-way locking mechanism. The two-way locking mechanism includes a first locking member and a second locking member respectively disposed on both sides of the emergency discharge door.

[0015] Preferably, the inner side of the moon pool enclosure is also provided with a lighting system and a monitoring camera. The lighting system is set on the moon pool enclosure and located above the flow guide shroud, and the monitoring camera is set on the moon pool enclosure.

[0016] The present invention adopts the above technical solution and has the following technical effects compared with the prior art: 1. Optimized Flow Control: The guide shield and guide fins work together to effectively guide water flow and reduce turbulence and wave impact. 2. Intelligent Dynamic Sealing: Multi-lobed sealing rings combined with a pressure adaptive system ensure reliable sealing under different sea conditions. 3. Enhanced Safety Protection: Retractable guardrails allow for quick deployment / retraction, ensuring safety without affecting equipment operation. 4. Enhanced Vibration Suppression: Helical guide strips disrupt vortex formation, significantly reducing the risk of structural vibration fatigue. 5. Automatic Height Compensation: The hydraulic lifting platform adjusts its height in real time to counteract the effects of hull movement. 6. Rapid Emergency Response: The hydraulically driven discharge door is equipped with a two-way locking mechanism, ensuring rapid and safe opening in emergencies. 7. 24 / 7 Monitoring: Integrated lighting and monitoring systems provide excellent visibility and real-time status monitoring. 8. Improved Maintenance Ease: Modular design makes key components easier to inspect and replace. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a moon pool structure for a drilling vessel according to the present invention; Figure 2 This is a schematic diagram of a wave compensation platform for a drilling vessel moon pool structure according to the present invention; Figure 3 This is a schematic diagram of the moon pool enclosure and flow guide shroud of a drilling vessel moon pool structure according to the present invention; Figure 4 This is a schematic diagram of the moon pool enclosure and flow guiding buffer mechanism of a drilling vessel moon pool structure according to the present invention; Figure 5 This is a schematic diagram of a retractable protective railing for a drilling vessel moon pool structure according to the present invention; Figure 6 This is a schematic diagram of the column and locking device of the moon pool structure of a drilling vessel according to the present invention; Figure 7 This is a schematic diagram of a vortex-induced vibration suppressor for a drilling vessel moon pool structure according to the present invention; Figure 8 This is a schematic diagram showing the connection between the emergency discharge door and the bottom of the moon pool structure of a drilling vessel according to the present invention; Figure 9 This is a schematic diagram of the moon pool opening and sealing system of a drilling vessel moon pool structure according to the present invention; Figure 10 This is a schematic diagram of a sealing system for a drilling vessel moon pool structure according to the present invention.

[0018] The reference numerals in the attached drawings are as follows: 1. Moon pool opening; 2. Moon pool enclosure; 3. Moon pool bottom; 4. Flow guiding and buffering mechanism; 401. Flow guide hood; 4011. Upper flow guide section; 4012. Vertical extension section; 4013. Flow guide channel; 402. Buffer plate; 403. Hinged support assembly; 4031. Fixed support; 4032. Swing arm; 4033. Elastic damper; 404. Flow guide fin; 4041. Auxiliary channel; 5. Sealing system; 501. Sealing ring; 5011. Sealing flap; 5012. Compression airbag; 502. Hydraulic actuator; 5 03. Sensor; 6. Retractable guardrail; 601. Guardrail unit; 6011. Post; 6012. Horizontal bar; 6013. Linkage mechanism; 602. Telescopic mechanism; 603. Locking device; 7. Wave compensation platform; 701. Hydraulic lifting column; 702. Flexible sealing skirt; 8. Vortex-induced vibration suppressor; 801. Spiral guide bar; 802. Turbulence fin; 9. Emergency discharge door; 901. Hydraulic push rod; 902. Two-way locking mechanism; 9021. First locking element; 9022. Second locking element; 10. Lighting system; 11. Monitoring camera. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0021] As attached Figures 1 to 10 The diagram shows a moon pool structure for a drilling vessel. The moon pool opening 1 has a chamfered edge, which works with the sealing system 5 to form a continuous sealing surface. The moon pool enclosure 2 has a double-shell structure with a reinforcing mesh between the two shells. The bottom 3 of the moon pool is covered with an anti-slip grating, which works with the emergency discharge door 9 to form a continuous working surface. The upper guide section 4011 of the flow guide shroud 401 is equipped with a flow guide plate, which is hinged to the upper guide section 4011 via a rotating shaft; the surface of the buffer plate 402 is provided with a corrugated flow guide groove, which extends along the water flow direction; the fixed support 4031 of the hinged support assembly 403 adopts a box-shaped structure, and the box-shaped structure is equipped with vibration damping material; the swing arm 4032 adopts a variable cross-section design, and a counterweight is provided in the middle of the swing arm 4032; the elastic damper 4033 is provided with ball joints at both ends, and the ball joints allow multi-directional displacement; The sealing system 5 includes four sets of rotatable sealing flaps 5011. The sealing flaps 5011 are driven by hydraulic actuators 502 to close and open the moon pool opening 1. When opening, the sealing flaps 5011 rotate to the deck area. The compression airbags 5012 are set at the joints of adjacent sealing flaps 5011 to achieve elastic sealing of the joints. The hydraulic actuators 502 adopt a synchronous hydraulic system to ensure that each sealing flap 5011 moves synchronously. The sensor 503 is an ultrasonic rangefinder. The number of ultrasonic rangefinders can be set to multiple sets and evenly distributed around the circumference of the moon pool opening 1. The uprights 6011 of the guardrail unit 601 are provided with guide grooves inside, which cooperate with the guide blocks of the horizontal rail 6012; the horizontal rail 6012 adopts a sleeve-type telescopic structure, and locking pins are set between each section of the sleeve-type telescopic structure; the linkage mechanism 6013 includes a sprocket drive group, which is connected to each guardrail unit 601 through a drive shaft; the telescopic mechanism 602 is driven by a hydraulic motor, which is connected to the sprocket drive group through a reducer; the locking device 603 is a hydraulic pin mechanism, which cooperates with the positioning holes of the horizontal rail 6012; The hydraulic lifting column 701 of the wave compensation platform 7 adopts a double-acting hydraulic cylinder, which is equipped with a displacement sensor; the flexible sealing skirt 702 adopts a pleated structure, and an annular support ring is set inside the pleated structure; the spiral guide bar 801 of the vortex-induced vibration suppressor 8 has guide holes on its surface, which are distributed along the spiral line; the turbulence fin 802 is connected to the spiral guide bar 801 through a rotating shaft, which is equipped with an angle sensor; the hydraulic push rod 901 of the emergency discharge door 9 adopts a multi-stage telescopic structure, and each stage of the multi-stage telescopic structure is equipped with a mechanical locking device; the first locking member 9021 and the second locking member 9022 of the bidirectional locking mechanism 902 adopt a wedge-shaped locking tongue, which cooperates with the inclined surface of the lock seat of the door frame; The lighting system 10 uses explosion-proof LED light groups, which are installed via universal brackets; the monitoring camera 11 is equipped with a pan-tilt mechanism, which enables panoramic monitoring; the surface of the guide fins 404 is coated with a drag-reducing coating to reduce water flow resistance; a guide grille is installed at the inlet of the auxiliary channel 4041 to prevent debris from entering; a guide plate is installed on the outer side of the moon pool enclosure 2 to reduce eddy current generation; and a drainage hole is installed at the bottom 3 of the moon pool, which is connected to the pump system. When the wave compensation platform 7 rises and falls, the hydraulic lifting column 701 extends and retracts synchronously, and the flexible sealing skirt 702 compresses or extends accordingly; when the emergency discharge door 9 opens, the hydraulic push rod 901 pushes the door body down, and the two-way locking mechanism 902 automatically releases the lock; when the sensor 503 detects a change in wave height, the hydraulic actuator 502 drives the sealing flap 5011 to press or release; when the telescopic mechanism 602 works, the hydraulic motor drives the sprocket transmission group, causing the crossbar 6012 to extend and retract synchronously; when the water flow inside the guide shroud 401 impacts the buffer plate 402, the swing arm 4032 rotates around the hinge point, and the elastic damper 4033 provides buffer resistance; when the vortex-induced vibration suppressor 8 works, the spiral guide bar 801 guides the water flow to form a vortex, and the turbulence fin 802 adjusts the angle to destroy the vortex street; when the lighting system 10 is activated, the monitoring camera 11 automatically adjusts the exposure parameters to ensure clear monitoring images. Example 2

[0022] Based on Embodiment 1, the solution in Embodiment 1 will be further described in detail below with reference to the specific working method, such as... Figures 1 to 10 As shown below, see details: Furthermore, the inner wall of the flow guide shroud 401 is circumferentially provided with several sets of flow guide fins 404, each set of flow guide fins 404 including multiple parallel flow guide fins 404. The flow guide fins 404 are inclined along the tangential direction of the inner wall of the flow guide shroud 401, and a gradually narrowing flow channel is formed between adjacent flow guide fins 404. The outer wall of the flow guide shroud 401 is provided with an annular reinforcing frame, which is connected to the inner side of the moon pool enclosure 2 through multiple sets of elastic support components. The elastic support components are evenly distributed along the circumference of the annular reinforcing frame. An adjustable flow guide plate assembly is provided at the connection between the upper flow guide section 4011 and the vertical extension section 4012. The adjustable flow guide plate assembly includes a flow guide plate hinged to the inner wall of the flow guide shroud 401 through a rotating shaft mechanism. The edge of the flow guide plate is provided with The guide vane 401 is equipped with a flexible sealing strip and an adjusting rod connected to the back of the guide vane. The other end of the adjusting rod is connected to a hydraulic actuator. An annular water collection trough is provided at the bottom of the guide vane 401. The annular water collection trough is connected to the bottom of the moon pool 3 through a drainage pipe. A control valve is provided on the drainage pipe. A guide vane limiting mechanism is also provided on the inner wall of the guide vane 401. The guide vane limiting mechanism includes a limiting groove provided on the inner wall of the guide vane 401 and a limiting block provided on the side of the guide vane. The limiting block and the limiting groove cooperate to limit the rotation angle of the guide vane. A drag-reducing coating is provided on the surface of the guide fin 404. The drag-reducing coating is made of a high-molecular polymer material. A pressure monitoring point is also provided on the inner wall of the guide vane 401. The pressure monitoring point is connected to the control system through a data acquisition system.

[0023] Furthermore, the buffer plate 402 adopts a composite layered structure, including a metal substrate and a polymer wear-resistant layer attached to its surface, and the edges of the buffer plate 402 are provided with flexible edging; the swing arm 4032 adopts a hollow structure, filled with damping material, and the connection end between the swing arm 4032 and the fixed support 4031 is provided with a self-lubricating bearing, and the connection end between the swing arm 4032 and the buffer plate 402 adopts a universal hinge structure; the elastic damper 4033 is a composite damping system composed of a hydraulic damper and a helical spring, the hydraulic damper is provided with an adjustable damping coefficient regulating valve, and the helical spring adopts a variable pitch design; a reinforcing rib is provided between the fixed support 4031 and the moon pool enclosure 2, and the reinforcing rib is flared. The buffer plate 402 has a radial distribution; multiple connecting lugs are provided on the back of the buffer plate 402, and the connecting lugs are connected to the swing arm 4032 by pins, with an anti-loosening device at the end of the pin; a counterweight is provided in the middle of the swing arm 4032, and the position of the counterweight can be adjusted along the length of the swing arm 4032; the hinged support assembly 403 also includes a limiting buffer block, which is provided on both sides of the fixed support 4031 to limit the swing angle of the swing arm 4032; the elastic damper 4033 is connected to the swing arm 4032 and the fixed support 4031 by ball joints at both ends; a pressure sensor is provided on the surface of the buffer plate 402, and the pressure sensor is connected to the control system to monitor the water flow impact force in real time.

[0024] Furthermore, the guide fin 404 adopts an airfoil cross-section design, with a leading edge thickness greater than the trailing edge thickness, and an anti-cavitation coating is applied to its surface. The root of the guide fin 404 is connected to the inner wall of the guide shield 401 via an adjustable mounting base, which includes a rotating base and an angle locking mechanism. Guide plates are provided between adjacent guide fins 404, forming a gradually expanding flow channel with the guide plates and the surface of the guide fins 404. A reinforcing skeleton is provided inside the curved portion at the end of the guide fin 404, and the reinforcing skeleton is radially distributed. A vortex generator is provided at the leading edge of the guide fin 404, and the vortex generator is a small airfoil structure. The surface of the guide fin 404... Multiple pressure measuring points are arranged on the surface, and the pressure measuring points are connected to the data acquisition system via data cables; a flexible baffle is provided at the trailing edge of the guide fin 404, and the flexible baffle is made of high polymer composite material; the adjustable mounting base includes a drive motor and a reduction mechanism, and the drive motor is linked with the hull motion monitoring system through the control system; an anti-biofouling device is also provided on the surface of the guide fin 404, and the anti-biofouling device adopts an ultrasonic generator; the interior of the guide fin 404 is hollow to form a weight reduction cavity, and the weight reduction cavity is filled with buoyancy material; a sealing structure is provided at the connection between the guide fin 404 and the guide cover 401, and the sealing structure adopts a multi-layer labyrinth seal.

[0025] Furthermore, the sealing system 5 includes four sets of rotatable sealing petals 5011. Each sealing petal 5011 employs a multi-layer composite material structure, comprising a metal base layer, an elastic intermediate layer, and a wear-resistant surface layer. Each sealing petal 5011 has a lip-shaped sealing edge. The compression airbag 5012 is an annular hollow structure, arranged around the joints of adjacent sealing petals 5011, and has an internal reinforcing mesh. A pressure distribution sensor is installed on the surface of the compression airbag 5012. The sealing petals 5011 are connected in a butt joint structure; the compression airbag 5012 expands after inflation to seal the joint. The hydraulic actuator 502 is a rotary hydraulic actuator. The actuator output shaft is connected to the rotating shaft of the sealing petal 5011, driving the sealing petals 5011 to close and open the moon pool opening 1. A guide mechanism is provided on the back of each sealing petal 5011, including a guide rail and a slider. An auxiliary support spring is also provided inside each sealing petal 5011 to provide auxiliary support. Springs are evenly distributed circumferentially around the sealing flap 5011; the pressure bladder 5012 is equipped with a pressure balance valve, which can adjust the internal pressure of the pressure bladder 5012, and the pressure bladder 5012 is used to seal the gap formed by adjacent sealing flaps 5011; a wear monitoring sensor is provided on the surface of the sealing flap 5011, and the wear monitoring sensor is connected to the control system; the hydraulic actuator 502 is equipped with an angle sensor, which monitors the rotation position of the sealing flap 5011 in real time; the sealing system 5 is also equipped with an emergency sealing system 5, which includes a spare airbag and a rapid inflation device; the shaft of the sealing flap 5011 adopts a sealed bearing structure, which allows the sealing flap 5011 to rotate smoothly; the pressure bladder 5012 is made of self-sealing material and its surface is covered with a protective layer; a pressure sensing diaphragm is provided on the contact surface between the sealing flap 5011 and the moon pool opening 1, and the pressure sensing diaphragm can monitor the sealing status in real time.

[0026] Furthermore, the upright 6011 adopts a segmented structure, including a base section and a detachable extension section, with a flange mounting plate at the bottom of the base section; the horizontal rail 6012 has reinforcing ribs inside, and its surface is covered with an anti-slip and wear-resistant layer; the linkage mechanism 6013 includes a gear transmission group and a connecting rod, with the gear transmission group located inside the upright 6011 and the connecting rod passing through adjacent uprights 6011; a drive motor is located at the top of the upright 6011, and the drive motor is connected to the gear transmission group through a reducer; the end of the horizontal rail 6012 has a rack structure, which meshes with the gear transmission group; the linkage mechanism 6013 also includes a synchronous shaft, which is arranged along the length of the guardrail unit 601 and connects each gear transmission group; a guide rail is located inside the upright 6011, and the guide rail is connected to the side of the horizontal rail 6012. The guide wheels on the surface are engaged; the horizontal rail 6012 adopts a multi-section telescopic structure, and the sections are connected by hinges; the guardrail unit 601 is also equipped with a limit switch, which is used to control the extension and retraction stroke of the horizontal rail 6012; the surface of the post 6011 is equipped with a warning sign, which is made of fluorescent material; the horizontal rail 6012 has an embedded lighting strip, which is connected to the ship's power supply system; the linkage mechanism 6013 also includes a manual operation device, which is used to manually control the extension and retraction of the horizontal rail 6012 in emergency situations; the bottom of the post 6011 is equipped with a drainage hole, which is equipped with an anti-clogging device; the extension and retraction end of the horizontal rail 6012 is equipped with a buffer pad, which is made of elastic material; the drive motor is equipped with an overload protection device, which can automatically stop operation when encountering an obstacle.

[0027] Furthermore, the wave compensation platform 7 adopts a multi-layer composite structure, including a load-bearing steel plate layer, a vibration-damping intermediate layer, and an anti-slip surface layer. The platform's interior is equipped with a crisscrossing reinforcing rib grid. The hydraulic lifting column 701 employs a multi-stage telescopic structure, with each hydraulic cylinder equipped with a displacement sensor and a pressure sensor. The bottom of the hydraulic lifting column 701 is connected to the bottom of the moon pool 3 via a universal hinge, and the top is connected to the platform via a ball joint. The flexible sealing skirt 702 adopts a corrugated pipe structure, composed of multiple layers of corrosion-resistant rubber material, with an embedded annular reinforcing ring. The wave compensation platform 7 has guide rollers at its edges, which move in conjunction with guide rails on the moon pool enclosure 2. The hydraulic lifting column 701 is equipped with a servo control system, which adjusts the platform height in real time based on wave monitoring data. The upper part of the flexible sealing skirt 702 is fixed to the platform edge by a pressure plate. The lower part is connected to the moon pool enclosure 2 via an adjustable connecting device; the platform surface is provided with anti-slip patterns and an array of drainage holes, which are connected to the drainage pipes inside the platform; a safety protection sleeve is provided around the hydraulic lifting column 701, and the inside of the safety protection sleeve is filled with cushioning material; a monitoring sensor is installed in the corrugated folds of the flexible sealing skirt 702, which can detect the degree of deformation and sealing status of the sealing skirt; the wave compensation platform 7 is also provided with an emergency locking mechanism, which can mechanically fix the platform position in case of hydraulic system failure; a flow guide 401 is provided at the bottom of the platform, which can reduce the impact of water flow on the platform; the hydraulic pipeline of the hydraulic lifting column 701 adopts a dual-circuit design and is equipped with an emergency power source; a pressure sensing strip is provided at the contact point between the flexible sealing skirt 702 and the moon pool enclosure 2, which can monitor the sealing status in real time.

[0028] Furthermore, the spiral guide bar 801 adopts a variable pitch design, with the pitch gradually decreasing from top to bottom. The cross-section of the spiral guide bar 801 is an airfoil structure with a rounded leading edge and a sharp trailing edge. The turbulence fin 802 is an adjustable angle structure, connected to the end of the spiral guide bar 801 via a rotating shaft mechanism. Flow control winglets are provided on the surface of the turbulence fin 802. A reinforcing skeleton is provided inside the spiral guide bar 801, and the reinforcing skeleton is distributed in a grid pattern. An installation rail is provided on the outside of the moon pool enclosure 2, arranged vertically. The spiral guide bar 801 is connected to the installation rail via a sliding base. The turbulence fin 802 is equipped with an angle adjustment mechanism, which includes a hydraulic actuator and a linkage transmission device. The surface of the spiral guide bar 801 is covered with an anti-corrosion and wear-resistant coating containing a self-lubricating material. The turbulence fin 802 is internally equipped with... A vibration sensor is installed and connected to the control system; a flow channel gap is formed between the spiral guide bar 801 and the moon pool enclosure 2, and the size of the flow channel gap varies along the spiral direction; the edge of the turbulence fin 802 is wrapped with a flexible material, which can reduce vortex-induced vibration; the spiral guide bar 801 is provided with an array of guide holes, which penetrate the inner and outer surfaces of the spiral guide bar 801; the turbulence fin 802 is equipped with a de-icing device, which adopts an electric heating method; the mounting base of the spiral guide bar 801 adopts a vibration reduction design, and the mounting base includes a rubber pad and a spring assembly; the angle adjustment mechanism of the turbulence fin 802 is linked to the ship motion monitoring system and can automatically adjust the angle of the turbulence fin 802 according to the sea conditions; the surface of the spiral guide bar 801 is also provided with an anti-biofouling device, which adopts seawater electrolysis technology.

[0029] Furthermore, the emergency discharge door 9 adopts a multi-layer composite structure, including a load-bearing base plate, a sealing layer, and an anti-corrosion coating, with wedge-shaped sealing surfaces on the door edges; the hydraulic push rod 901 is a double-acting hydraulic cylinder, with its two ends connected to the bottom of the moon pool 3 and the emergency discharge door 9 respectively by universal hinges; the first locking member 9021 and the second locking member 9022 of the bidirectional locking mechanism 902 are symmetrically arranged, each locking member including a latch, a drive cylinder, and a guide mechanism; a pressure balancing system is provided around the emergency discharge door 9, including pressure equalization pipelines and regulating valve groups; the latch tongue adopts a conical design, and the surface of the latch tongue is coated with wear-resistant material; the bottom of the moon pool 3 is provided with a lock seat that cooperates with the latch tongue, and the lock seat contains buffer material; the hydraulic push rod 901 is equipped with a displacement sensor and a pressure sensor to transmit signals to the central control system; emergency The emergency discharge door 9 has a reinforcing mesh inside, with the reinforcing ribs distributed radially. The two-way locking mechanism 902 also has a manual unlocking device, which includes a handwheel and a transmission gear set. The surface of the emergency discharge door 9 is equipped with a baffle plate to reduce the impact of water flow on the door. The latch drive cylinder is equipped with a mechanical position holding mechanism to maintain the locked state when the hydraulic system loses pressure. The contact surface between the emergency discharge door 9 and the bottom of the moon pool 3 is equipped with multiple sealing rings 501, which are made of pressure-resistant and wear-resistant materials. The hydraulic push rod 901 system is equipped with an emergency power unit, which can provide power when the main system fails. The mating surface between the latch and the lock seat is designed with a bevel to ensure increased locking force under pressure. The emergency discharge door 9 is also equipped with a status monitoring system, which includes a door position sensor and a sealing status detection device.

[0030] Furthermore, the lighting system 10 adopts explosion-proof and waterproof LED lighting devices, which are mounted on the moon pool enclosure 2 via adjustable angle brackets, covering the entire moon pool area. The lighting system 10 is equipped with multiple lighting units, which are evenly distributed around the circumference of the moon pool enclosure 2. The monitoring camera 11 is a high-definition anti-fog camera with a protective cover, which is equipped with an automatic defogging device and a cleaning nozzle. A camera mounting platform is set at the corner of the moon pool enclosure 2, and the mounting platform is connected to the moon pool enclosure 2 via a vibration damping mechanism. The lighting system 10 and the monitoring camera 11 work together, and the lighting brightness is automatically increased when the monitoring camera 11 detects personnel activity. The lighting system 10 is equipped with an emergency lighting mode, which is powered by a backup power supply. Equipped with a pan-tilt mechanism, the system allows for horizontal and vertical rotation adjustment; the lighting system 10 is equipped with a light intensity sensor that automatically adjusts the lighting brightness according to ambient light; the monitoring camera 11 is equipped with a zoom lens and infrared night vision function to ensure all-weather monitoring capability; the lighting system 10 uses a modular design for its light units, allowing for individual replacement and maintenance; the monitoring camera 11 is connected to the ship's central monitoring system for remote monitoring and recording; the moon pool enclosure 2 is also equipped with auxiliary lighting, which provides illumination when the main lighting system 10 fails; the camera protective cover is made of corrosion-resistant material with an anti-adhesion coating; the lighting system 10 is equipped with a status indicator that displays the operating status of the lighting system 10.

[0031] 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. Secondly, the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. 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 moon pool structure for a drilling vessel, comprising a moon pool opening (1), a moon pool enclosure wall (2), and a moon pool bottom (3), characterized in that, Also includes: The flow guiding and buffering mechanism (4) is arranged around the inner side of the moon pool enclosure (2), including a flow guiding hood (401), a buffer plate (402), and a hinged support assembly (403) connecting the flow guiding hood (401) and the buffer plate (402). A sealing system (5) is provided at the periphery of the moon pool opening (1) and includes a sealing ring (501), a hydraulic actuator (502) for driving the sealing ring (501), and a sensor (503) for sensing wave height. A retractable guardrail (6) is provided at the edge of the moon pool opening (1) and includes multiple guardrail units (601), a telescopic mechanism (602) for driving the guardrail units (601), and a locking device (603).

2. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The fairing (401) includes: The upper guide section (4011) has an arc-shaped cross-section that slopes toward the center of the moon pool; A vertical extension section (4012) is connected at one end to the end of the upper guide section (4011); A flow channel (4013) is formed between the upper flow section (4011) and the vertical extension section (4012).

3. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The buffer plate (402) is connected to the air deflector (401) via the hinged support assembly (403), the hinged support assembly (403) comprising: A fixed support (4031) is connected to the moon pool enclosure wall (2); The swing arm (4032) is hinged at one end to the fixed support (4031) and at the other end to the buffer plate (402); An elastic damper (4033) is disposed between the swing arm (4032) and the fixed support (4031).

4. The moon pool structure of the drilling vessel according to claim 2, characterized in that: The inner side of the flow guide shroud (401) is also provided with flow guide fins (404). The flow guide fins (404) are arranged circumferentially and form an acute angle with the flow direction of the flow guide channel (4013). An auxiliary channel (4041) is formed between adjacent flow guide fins (404). The end of the flow guide fins (404) bends towards the center of the moon pool.

5. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The sealing ring (501) is composed of a plurality of sealing petals (5011), and a compression airbag (5012) is formed inside the sealing petals (5011). The compression airbag (5012) is used to seal the gap formed between adjacent sealing petals (5011).

6. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The guardrail unit (601) includes: Column (6011), hollow inside; A horizontal bar (6012) is slidably disposed within the column (6011); Linkage mechanism (6013) is used to connect adjacent horizontal bars (6012).

7. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The bottom of the moon pool (3) is also provided with a wave compensation platform (7), which is connected to the bottom of the moon pool (3) by a hydraulic lifting column (701), and a flexible sealing skirt (702) is provided between the periphery and the wall of the moon pool (2).

8. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The outer side of the moon pool enclosure (2) is provided with a vortex-induced vibration suppressor (8). The vortex-induced vibration suppressor (8) includes a spiral guide bar (801) and a turbulence fin (802) disposed at the end of the spiral guide bar (801). The spiral guide bar (801) extends spirally along the outer periphery of the moon pool enclosure (2).

9. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The bottom (3) of the moon pool is provided with an openable and closable emergency discharge door (9). The emergency discharge door (9) is driven by a hydraulic push rod (901) and is provided with a two-way locking mechanism (902). The two-way locking mechanism (902) includes a first locking member (9021) and a second locking member (9022) respectively disposed on both sides of the emergency discharge door (9).

10. The moon pool structure of the drilling vessel according to claim 1, characterized in that: The inner side of the moon pool enclosure (2) is also provided with a lighting system (10) and a monitoring camera (11). The lighting system (10) is set on the moon pool enclosure (2) and located above the flow guide (401). The monitoring camera (11) is set on the moon pool enclosure (2).

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