Anti-drag device used in moon pool of drilling ship

Abstract

The drag reduction device comprises a fixing frame and a connecting frame, separation rods are fixedly connected to the inner wall of the connecting frame at equal intervals along a straight line, rotating shafts are rotatably connected to the interior of the connecting frame at equal intervals along the straight line, and separation plates are fixedly connected to the outer sides of the rotating shafts; the invention relates to the technical field of drilling ship moon pool resistance reduction, and the resistance reduction device used in the drilling ship moon pool realizes the function of reducing fluid oscillation in the moon pool by arranging the connecting frame, the separation rod, the transmission mechanism, the separation plate, the swash hole, the adjusting mechanism, the swash frame, the rotating bracket and the swash column, so that the resistance of a ship can be effectively reduced; the transmission mechanism can drive the partition plate to rotate when the connecting frame moves downwards to make contact with the fixed frame, the rotating support can be driven to rotate for use when the partition plate rotates in cooperation with the adjusting mechanism, the partition plate can be driven to automatically rotate and be stored when the connecting frame is separated from the fixed frame, and the size of the device is reduced.

Description

Technical Field

[0001] This invention relates to the field of drag reduction technology for the moon pool of drilling ships, specifically a drag reduction device for use inside the moon pool of drilling ships. Background Technology

[0002] The moon pool is a key structure on a drilling vessel. Essentially, it's a vertical passageway located amidships, connecting the upper deck to the hull. Due to its unique structure and function, it's called the moon pool. Located amidships, compared to working at the hull edge, the moon pool significantly reduces the contact between drilling equipment and waves, minimizes the interference of ship roll on operations, and provides a more stable space for drilling string lowering and equipment operation, thus improving operational accuracy and safety.

[0003] In existing technologies, the moon pool of drilling vessels is subject to hull rolling, wind, wave, and current coupling, causing turbulence and oscillations in the seawater. This increases the vessel's viscous drag and wave drag, leading to increased fuel consumption and reduced speed. Furthermore, the water inside the moon pool may resonate with the vessel's speed or wave frequency, causing severe water vibrations. This not only increases the vessel's drag but may also cause hull vibrations, affecting operational stability. Therefore, we propose a drag-reducing device for the interior of the moon pool on drilling vessels. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a drag reduction device for the interior of the moon pool of a drilling vessel. This device solves the problems caused by the hull rolling, wind, wave and current coupling, etc., which can easily lead to turbulence and oscillation in the seawater within the moon pool. This increases the viscous drag and wave drag of the vessel, thereby increasing fuel consumption and reducing speed. Furthermore, the water inside the moon pool may resonate with the vessel's speed or wave frequency, causing severe water vibration. This not only increases the vessel's drag but may also cause hull vibration, affecting operational stability.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A drag reduction device for use inside the moon pool of a drilling ship includes a fixed frame and a connecting frame. The inner wall of the connecting frame is fixedly connected with partition rods at equal intervals along a straight line. The inside of the connecting frame is rotatably connected with a rotating shaft at equal intervals along a straight line. The outside of the rotating shaft is fixedly connected with a partition plate. The partition plate has multiple damping holes inside. The inside of the connecting frame is provided with a transmission mechanism for driving the rotating shaft to rotate. The partition plate is internally slidably connected to a sway control frame. Support blocks are symmetrically fixedly connected to one side of the partition plate. A rotating bracket is rotatably connected between the two support blocks. Sway control columns are fixedly connected at equal intervals along a straight line on one side of the rotating bracket. The top of the connecting frame is provided with an adjustment mechanism for moving the sway control frame and for rotating the rotating bracket.

[0006] In a preferred embodiment, the transmission mechanism includes a limiting frame, the inner wall of the connecting frame is equidistantly connected to the limiting frame along a straight line, a sliding seat is fixedly connected to one side of the limiting frame, a connecting rod is fixedly connected to one side of the sliding seat, a rack is fixedly connected to the top of the connecting rod, and gears that cooperate with the rack are symmetrically fixedly connected to the outer side of the rotating shaft.

[0007] The technical effect of adopting the above-mentioned further solution is that the sliding seat drives the rack to move through the connecting rod, thereby driving the gear to rotate, and the gear drives the partition plate to rotate through the rotating shaft.

[0008] In a preferred embodiment, the inner wall of the connecting frame is fixedly connected with limit slide rods at equal intervals along a straight line, and the limit frame is slidably connected to the limit slide rods.

[0009] The technical effect of adopting the above-mentioned further solution is that the movement of the limiting frame can be limited by the limiting slide bar, so that the limiting frame slides along the limiting slide bar to prevent deviation.

[0010] In a preferred embodiment, a lifting plate is slidably connected to the inner wall of the connecting frame, and lifting columns are fixedly connected at equal intervals along a straight line at the bottom of the lifting plate. The lifting columns are slidably connected to the connecting frame, and a fixing rod is fixedly connected at equal intervals along a straight line at the top of the lifting plate. A protrusion is fixedly connected to one side of the fixing rod, and an inclined groove that cooperates with the protrusion is opened inside the sliding seat.

[0011] The technical effect of adopting the above-mentioned further solution is that the lifting plate drives the fixed rod to move upward, so that the protrusion and the inclined groove cooperate, thereby driving the sliding seat to slide during the upward movement of the fixed rod.

[0012] In a preferred embodiment, the inner wall of the connecting frame is fixedly connected with limit rods at equal intervals along a straight line, the lifting plate is slidably connected to the limit rods, and a spring is sleeved on the outer side of the limit rods and on one side of the lifting plate.

[0013] The technical effect of adopting the above-mentioned further solution is that the spring can drive the lifting plate to move and reset, and the limit rod can limit the movement of the lifting plate, so that the lifting plate slides along the limit rod to prevent deviation.

[0014] In a preferred embodiment, the adjustment mechanism includes a fixed block, the fixed block is symmetrically fixedly connected to the top of the connecting frame, a first rotating rod is rotatably connected to the outside of the fixed block, and a second slider is symmetrically slidably connected to the inside of the partition plate, with the first rotating rod and the second slider being rotatably connected.

[0015] The technical effect of adopting the above-mentioned further solution is that during the rotation of the partition plate, the first rotating rod will rotate around the fixed block, thereby causing the second slider to slide along the inner wall of the partition plate.

[0016] In a preferred embodiment, a connecting rod is fixedly connected to one side of the second slider, the connecting rod is slidably connected to the partition plate, and a first slider is fixedly connected to the end of the connecting rod away from the second slider, the first slider being slidably connected to the partition plate.

[0017] The technical effect of adopting the above-mentioned further solution is that the second slider drives the first slider to move through the connecting rod.

[0018] In a preferred embodiment, the oscillation frame is fixedly connected to the first slider.

[0019] The technical effect of adopting the above-mentioned further solution is that the first slider drives the oscillating frame to move, so that the oscillating frame is exposed for use.

[0020] In a preferred embodiment, a second rotating rod is rotatably connected to one side of the first slider, and a connecting block is fixedly connected to one side of the second rotating rod. The two oscillating columns have connecting grooves inside that cooperate with the connecting block.

[0021] The technical effect of adopting the above-mentioned further solution is that the movement of the first slider drives the second rotating rod to rotate, so that the connecting block and the connecting groove can be used together, thereby driving the oscillating column to rotate when the first slider moves.

[0022] This invention provides a drag reduction device for the interior of a drilling ship's moon pool. Compared with the prior art, it has the following advantages: This drag reduction device for the interior of a drilling ship's moon pool, through the arrangement of a connecting frame, a partition rod, a transmission mechanism, a partition plate, a sway-damping hole, an adjustment mechanism, a sway-damping frame, a rotating support, and a sway-damping column, achieves the function of reducing fluid oscillation within the moon pool of the drilling ship, effectively reducing the ship's resistance. The transmission mechanism can drive the partition plate to rotate when the connecting frame moves downward and contacts the fixed frame. In conjunction with the adjustment mechanism, the rotating support can be driven to rotate when the partition plate rotates. Furthermore, when the connecting frame separates from the fixed frame, the partition plate can be automatically rotated and stored, reducing the size of the device and enhancing its effectiveness. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the partition plate of the present invention when it is stored; Figure 3 This is a schematic diagram of the internal structure of the connecting frame of the present invention; Figure 4This is an enlarged view of part A of the present invention; Figure 5 This is a schematic diagram of the lifting plate of the present invention; Figure 6 This is an enlarged view of part B of the present invention; Figure 7 This is a schematic diagram of the structure of the partition plate of the present invention; Figure 8 This is a schematic diagram of the structure of the oscillation control frame of the present invention; Figure 9 This is an enlarged view of part C of the present invention.

[0024] Legend: 1. Fixed frame; 2. Connecting frame; 201. Divider rod; 202. Rotating shaft; 3. Divider plate; 301. Rotating bracket; 302. Squeezing column; 303. Squeezing hole; 304. Squeezing frame; 305. Support block; 4. Transmission mechanism; 401. Lifting plate; 402. Spring; 403. Lifting column; 404. Limiting rod; 405. Fixing rod; 406. Limiting slide rod; 407. Limiting frame; 408. Sliding seat; 409. Gear; 410. Rack; 411. Connecting rod; 412. Inclined groove; 413. Protrusion; 5. Adjustment mechanism; 501. First slider; 502. Connecting rod; 503. First rotating rod; 504. Fixed block; 505. Second slider; 506. Second rotating rod; 507. Connecting block; 508. Connecting groove. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0026] Please see Figures 1 to 9 The present invention provides a technical solution: A drag reduction device for use inside the moon pool of a drilling vessel includes a fixed frame 1 and a connecting frame 2. A partition rod 201 is fixedly connected at equal intervals along a straight line to the inner wall of the connecting frame 2. A rotating shaft 202 is rotatably connected at equal intervals along a straight line inside the connecting frame 2. A partition plate 3 is fixedly connected to the outer side of the rotating shaft 202. Multiple damping holes 303 are formed inside the partition plate 3, with different hole diameters. By distributing the holes at different sizes, the resonant frequency matching can be disrupted, thus avoiding resonance at specific frequencies. A transmission mechanism 4 is provided inside the connecting frame 2 to drive the rotating shaft 202 to rotate. A damping frame 304 is slidably connected inside the partition plate 3. Support blocks 305 are symmetrically fixedly connected to one side of the partition plate 3. A rotating bracket 301 is rotatably connected between two support blocks 305. Damping columns 302 are fixedly connected at equal intervals along a straight line to one side of the rotating bracket 301. An adjustment mechanism 5 is provided at the top of the connecting frame 2 to move the damping frame 304 and to rotate the rotating bracket 301.

[0027] In this design, the fixed frame 1 is installed on the inner wall of the moon pool of the drilling vessel, and the connecting frame 2 is placed inside the moon pool using a hoisting device. The fluid oscillation in the moon pool can be reduced by the combination of the partition rod 201, partition plate 3, oscillation-controlling hole 303, oscillation-controlling frame 304, and oscillation-controlling column 302. The opening only allows a portion of the water flow to pass through. When the water flows through the hole, small-scale vortices are generated at the edge of the hole. The oscillation energy can be consumed by the viscosity dissipation of the vortices. At the same time, the opening disperses the main water flow into multiple fine streams, avoiding resonance caused by a single high-speed flow, thereby achieving the effect of drag reduction. The transmission mechanism 4 can drive the partition plate 3 to rotate when the connecting frame 2 moves downward and contacts the fixed frame 1. The adjustment mechanism 5 can drive the rotating bracket 301 to rotate when the partition plate 3 rotates. When the connecting frame 2 separates from the fixed frame 1, the partition plate 3 can be automatically rotated and stored, reducing the size of the device and enhancing its performance.

[0028] like Figure 3 , Figure 4 , Figure 5 and Figure 6As shown: In this scheme, the transmission mechanism 4 includes a limiting frame 407. The limiting frame 407 is slidably connected to the inner wall of the connecting frame 2 along a straight line at equal intervals. A sliding seat 408 is fixedly connected to one side of the limiting frame 407. A connecting rod 411 is fixedly connected to one side of the sliding seat 408. A rack 410 is fixedly connected to the top of the connecting rod 411. Gears 409 that cooperate with the rack 410 are symmetrically fixedly connected to the outer side of the rotating shaft 202. Limiting slide rods 406 are fixedly connected to the inner wall of the connecting frame 2 along a straight line at equal intervals. The limiting frame 407 and the limiting slide rods 406 are slidably connected. The inner wall of the connecting frame 2 is slidably connected to... There is a lifting plate 401. The bottom of the lifting plate 401 is fixedly connected with lifting columns 403 at equal intervals along a straight line. The lifting columns 403 are slidably connected to the connecting frame 2. The top of the lifting plate 401 is fixedly connected with fixing rods 405 at equal intervals along a straight line. A protrusion 413 is fixedly connected to one side of the fixing rod 405. The sliding seat 408 has a slanted groove 412 inside that cooperates with the protrusion 413. The inner wall of the connecting frame 2 is fixedly connected with limit rods 404 at equal intervals along a straight line. The lifting plate 401 is slidably connected to the limit rods 404. A spring 402 is sleeved on the outside of the limit rods 404 and on one side of the lifting plate 401.

[0029] In this design, as the connecting frame 2 moves downward, the lifting column 403 first contacts the fixed frame 1, causing it to slide along the inner wall of the connecting frame 2. The lifting column 403 then drives the lifting plate 401 to slide along the limiting rod 404, compressing the spring 402. Simultaneously, the lifting plate 401 drives the fixed rod 405 upward, causing the protrusion 413 to engage with the inclined groove 412. As the fixed rod 405 moves upward, it drives the sliding seat 408 to slide. The limiting frame 407 and the limiting slide rod 406 limit the movement of the sliding seat 408, preventing deviation. The sliding seat 408, through the connecting rod 411, drives the rack 410 to move, thereby driving the gear 409 to move. The gear 409 rotates, driving the partition plate 3 to rotate via the rotating shaft 202. When the connecting frame 2 needs to be retracted, it can be retracted using a hoisting device, separating the connecting frame 2 from the fixed frame 1. The spring 402 is a high-strength helical spring, which, due to its elasticity, drives the lifting plate 401 to move and reset. The lifting plate 401, via the fixed rod 405, drives the protrusion 413 to move and reset, thereby driving the sliding seat 408 to move. The sliding seat 408, via the connecting rod 411, drives the rack 410 to move and reset. The rack 410, via the gear 409, drives the rotating shaft 202 to rotate in the opposite direction, thus allowing the partition plate 3 to be stored, reducing the size of the device and enhancing its usability.

[0030] like Figure 7 , Figure 8 and Figure 9As shown: In this scheme, the adjusting mechanism 5 includes a fixed block 504. The fixed block 504 is symmetrically fixedly connected to the top of the connecting frame 2. The first rotating rod 503 is rotatably connected to the outside of the fixed block 504. The second slider 505 is symmetrically slidably connected to the inside of the partition plate 3. The first rotating rod 503 and the second slider 505 are rotatably connected. A connecting rod 502 is fixedly connected to one side of the second slider 505. The connecting rod 502 is slidably connected to the partition plate 3. The end of the connecting rod 502 away from the second slider 505 is fixedly connected to the first slider 501. The first slider 501 is slidably connected to the partition plate 3. The oscillation frame 304 is fixedly connected to the first slider 501. A second rotating rod 506 is rotatably connected to one side of the first slider 501. A connecting block 507 is fixedly connected to one side of the second rotating rod 506. The two oscillation columns 302 have connecting grooves 508 inside that cooperate with the connecting block 507.

[0031] In this scheme, during the rotation of the partition plate 3, the first rotating rod 503 will rotate around the fixed block 504, thereby causing the second slider 505 to slide along the inner wall of the partition plate 3. The second slider 505 drives the first slider 501 to move through the connecting rod 502. The first slider 501 drives the swaying frame 304 to move, so that the swaying frame 304 is exposed for use. At the same time, the movement of the first slider 501 drives the second rotating rod 506 to rotate, so that the connecting block 507 and the connecting groove 508 cooperate for use. Thus, when the first slider 501 moves, it drives the swaying column 302 to rotate for use.

[0032] Working principle: In use, the fixed frame 1 is installed on the inner wall of the moon pool of the drilling vessel, and the connecting frame 2 is placed into the moon pool using hoisting equipment. During the downward movement, the lifting column 403 will first contact the fixed frame 1, thereby causing the lifting column 403 to slide along the inner wall of the connecting frame 2. The lifting column 403 causes the lifting plate 401 to slide along the limiting rod 404, and the spring 402 is compressed. At the same time, the lifting plate 401 causes the fixed rod 405 to move upward, so that the protrusion 413 and the inclined groove 412 cooperate. Thus, during the upward movement of the fixed rod 405, the sliding seat 408 is driven to slide, which is achieved through the limiting frame 407 and the limiting... The sliding rod 406 can limit the movement of the sliding seat 408 to prevent deviation. The sliding seat 408 drives the rack 410 to move via the connecting rod 411, thereby driving the gear 409 to rotate. The gear 409 drives the partition plate 3 to rotate via the rotating shaft 202. During the rotation of the partition plate 3, the first rotating rod 503 will rotate around the fixed block 504, thereby driving the second slider 505 to slide along the inner wall of the partition plate 3. The second slider 505 drives the first slider 501 to move via the connecting rod 502. The first slider 501 drives the damper frame 304 to move, so that the damper frame 304 is exposed. In operation, the movement of the first slider 501 drives the rotation of the second rotating rod 506, causing the connecting block 507 to engage with the connecting groove 508. This allows the first slider 501 to move, causing the damping column 302 to rotate. The combination of the partition rod 201, partition plate 3, damping hole 303, and damping frame 304 with the damping column 302 reduces fluid oscillation within the moon pool. The opening only allows partial water flow; when water flows through the opening, small-scale vortices are generated at the edge. The viscous dissipation of these vortices dissipates the oscillation energy. Simultaneously, the opening disperses the main water flow into multiple fine streams, preventing resonance caused by a single high-speed flow, thus achieving... To achieve drag reduction, when the connecting frame 2 needs to be retracted, it can be retracted using hoisting equipment, separating the connecting frame 2 from the fixed frame 1. The spring 402 will move and reset the lifting plate 401 due to its elastic force. The lifting plate 401 moves and resets the protrusion 413 through the fixed rod 405, thereby moving the sliding seat 408. The sliding seat 408 moves and resets the rack 410 through the connecting rod 411. The rack 410 drives the rotating shaft 202 to rotate in the opposite direction through the gear 409, thereby allowing the partition plate 3 to be stored, reducing the size of the device and enhancing its usability.

[0033] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] Although embodiments of the invention have 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 embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A drag-reducing device for use inside the moon pool of a drilling vessel, comprising a fixed frame (1) and a connecting frame (2), characterized in that: The inner wall of the connecting frame (2) is fixedly connected with a partition rod (201) at equal intervals along a straight line. The inside of the connecting frame (2) is rotatably connected with a rotating shaft (202) at equal intervals along a straight line. The outside of the rotating shaft (202) is fixedly connected with a partition plate (3). The inside of the partition plate (3) is provided with a plurality of damping holes (303). The inside of the connecting frame (2) is provided with a transmission mechanism (4) for driving the rotating shaft (202) to rotate. The partition plate (3) is internally slidably connected to a sway control frame (304). A support block (305) is symmetrically fixedly connected to one side of the partition plate (3). A rotating bracket (301) is rotatably connected between the two support blocks (305). A sway control column (302) is fixedly connected to one side of the rotating bracket (301) along a straight line at equal intervals. The top of the connecting frame (2) is provided with an adjustment mechanism (5) for moving the sway control frame (304) and for rotating the rotating bracket (301).

2. A drag-reducing device for the interior of a drilling vessel's moon pool according to claim 1, characterized in that: The transmission mechanism (4) includes a limiting frame (407). The inner wall of the connecting frame (2) is equidistantly connected to the limiting frame (407) along a straight line. A sliding seat (408) is fixedly connected to one side of the limiting frame (407). A connecting rod (411) is fixedly connected to one side of the sliding seat (408). A rack (410) is fixedly connected to the top of the connecting rod (411). Gears (409) that cooperate with the rack (410) are symmetrically fixedly connected to the outer side of the rotating shaft (202).

3. A drag-reducing device for the interior of a drilling vessel's moon pool according to claim 2, characterized in that: The inner wall of the connecting frame (2) is fixedly connected with a limiting slide rod (406) at equal intervals along a straight line, and the limiting frame (407) is slidably connected to the limiting slide rod (406).

4. A drag-reducing device for the interior of a drilling vessel's moon pool according to claim 2, characterized in that: The inner wall of the connecting frame (2) is slidably connected to a lifting plate (401). The bottom of the lifting plate (401) is fixedly connected to a lifting column (403) at equal intervals along a straight line. The lifting column (403) is slidably connected to the connecting frame (2). The top of the lifting plate (401) is fixedly connected to a fixing rod (405) at equal intervals along a straight line. A protrusion (413) is fixedly connected to one side of the fixing rod (405). The sliding seat (408) has an inclined groove (412) inside that cooperates with the protrusion (413).

5. A drag-reducing device for the interior of a drilling vessel's moon pool according to claim 4, characterized in that: The inner wall of the connecting frame (2) is fixedly connected with limit rods (404) at equal intervals along a straight line. The lifting plate (401) is slidably connected with the limit rods (404). A spring (402) is sleeved on the outer side of the limit rods (404) and on one side of the lifting plate (401).

6. A drag-reducing device for the interior of a drilling vessel's moon pool according to claim 1, characterized in that: The adjustment mechanism (5) includes a fixed block (504), the top of the connecting frame (2) is symmetrically fixedly connected to the fixed block (504), the outside of the fixed block (504) is rotatably connected to the first rotating rod (503), the inside of the partition plate (3) is symmetrically slidably connected to the second slider (505), and the first rotating rod (503) and the second slider (505) are rotatably connected.

7. A drag-reducing device for use inside the moon pool of a drilling vessel according to claim 6, characterized in that: A connecting rod (502) is fixedly connected to one side of the second slider (505). The connecting rod (502) is slidably connected to the partition plate (3). A first slider (501) is fixedly connected to the end of the connecting rod (502) away from the second slider (505). The first slider (501) is slidably connected to the partition plate (3).

8. A drag-reducing device for use inside the moon pool of a drilling vessel according to claim 7, characterized in that: The oscillation frame (304) is fixedly connected to the first slider (501).

9. A drag-reducing device for the interior of a drilling vessel's moon pool according to claim 7, characterized in that: The first slider (501) is rotatably connected to a second rotating rod (506) on one side, and a connecting block (507) is fixedly connected to one side of the second rotating rod (506). The two oscillating columns (302) have connecting grooves (508) inside that cooperate with the connecting block (507).

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