Buoyancy and semi-submersible floating wind turbine

Abstract

This disclosure presents a floating box and a semi-submersible floating wind turbine. The floating box includes a box body, an annular pipe, and a cavity. The outer circumferential surface of the box body is cylindrical, which reduces the significant directional anisotropy of the floating box's geometry and avoids directional anisotropy on the outer circumferential surface of the box body, which is easily exposed to environmental loads, thereby reducing the sensitivity of the semi-submersible floating wind turbine and other platforms to the direction of environmental loads. The cavity is filled with fluid, and the cavity is equipped with a second drive unit capable of driving the fluid to move along the cavity. Thus, according to the swaying response of the semi-submersible floating wind turbine and other platforms, the second drive unit adjusts the angle between the axial direction of the annular pipe and the axial direction of the cylindrical surface, achieving the tilting of the annular pipe and generating a precession torque. Simultaneously, the direction of the precession torque is adjusted by rotating the annular pipe relative to the box body to counteract the environmental loads on the semi-submersible floating wind turbine and other platforms, thereby achieving sway reduction of the semi-submersible floating wind turbine and other platforms.

Description

Technical Field

[0001] The embodiments disclosed herein relate to, but are not limited to, the field of anti-sway technology, and particularly to a pontoon and a semi-submersible floating wind turbine. Background Technology

[0002] The key support structure of current deep-sea wind power facilities, such as semi-submersible floating wind turbines, is typically composed of pontoons and struts. To ensure the stability and economy of the overall structure, the pontoons often adopt a shape that matches the layout of the struts, resulting in significant directional anisotropy in the geometry of the pontoons. When the semi-submersible floating wind turbine is subjected to environmental loads such as wind, waves, and currents from different directions, its dynamic response characteristics will exhibit obvious directional differences. Summary of the Invention

[0003] The purpose of this disclosure is to propose a floating box and a semi-submersible floating wind turbine, which aims to solve the problem that the geometry of existing floating boxes has significant directional anisotropy, resulting in obvious directional differences in the dynamic response characteristics of semi-submersible floating wind turbines.

[0004] This disclosure provides a floating box, including: The enclosure has a cylindrical outer circumference, and the enclosure together forms an installation space. A circular annular pipe, coaxially arranged with the cylindrical surface, is installed in the installation space and rotatably connected to the housing. The annular pipe is filled with liquid and is equipped with at least one first driving unit configured to drive the liquid, causing it to move along the annular pipe. A cavity is connected to the annular pipe and filled with fluid. The cavity is provided with at least one second driving unit, which is configured to drive the fluid to move along the cavity to adjust the angle between the axial direction of the annular pipe and the axial direction of the cylindrical surface.

[0005] In some embodiments of the float, the cavity is connected to the box body; The cavity is annular and coaxially arranged with the cylindrical surface; The cavity is configured to change its shape according to the movement of fluid within it; The annular pipe is rotatably connected to the cavity via a rotating assembly.

[0006] In some embodiments of the pontoon, the rotating assembly includes a fixed disk and a rotating disk, the fixed disk and the rotating disk being rotatably connected and respectively coaxially arranged with the cylindrical surface; The fixed disk is disposed in the cavity, and the rotating disk is provided with multiple clamps, which are evenly distributed around the rotating shaft of the rotating disk; The clamp includes a base and a vertical plate. The vertical plate is mounted on the rotating disk via the base. The vertical plate has notches on both sides arranged radially along the rotating disk, and the vertical plate has an installation groove that matches the annular pipe.

[0007] In some embodiments of the float, the second drive unit includes a pneumatically controlled valve; The cavity has a first air chamber and a second air chamber, the first air chamber and the second air chamber are mirror-symmetrical about a plane, and the axis of the cylindrical surface is located in the plane; The air control valve is installed at the junction of the first air chamber and the second air chamber.

[0008] In some embodiments of the floating box, the box body is annular.

[0009] In some embodiments of the float, the fluid is a liquid; The cavity includes a first pipe section and a second pipe section; The first pipe segment spans the annular pipe radially, and the second pipe segment spans the annular pipe radially. The first pipe segment and the second pipe segment are mirror symmetrical about the annular pipe.

[0010] In some embodiments of the pontoon, both ends of the first pipe section and both ends of the second pipe section are connected to the annular pipe.

[0011] In some embodiments of the pontoon, the first pipe section is provided with the second drive unit, which is located on the axis of the cylindrical surface; The second pipe segment is equipped with the second drive unit, which is located on the axis of the cylindrical surface.

[0012] In some embodiments of the pontoon, the first drive unit is a shaftless rim drive pump.

[0013] This disclosure also provides a semi-submersible floating wind turbine, comprising: The floating box as described above; Support pillars, the support pillars being disposed on the pontoon; and The wind turbine body is mounted on the floating box via the support column.

[0014] Compared with related technologies, implementing the embodiments of this disclosure will have the following beneficial effects: The aforementioned floating box design, when applied to semi-submersible floating wind turbines, not only enhances the turbine's buoyancy and submersion performance but also reduces its sensitivity to environmental load direction. Specifically, the floating box comprises a box body, an annular pipe, and a cavity. The outer circumferential surface of the box body is cylindrical, minimizing significant directional anisotropy in the floating box's geometry and preventing directional anisotropy from occurring on the outer circumferential surface, which is easily exposed to environmental loads. This reduces the sensitivity of semi-submersible floating wind turbines and similar platforms to environmental load direction. The annular pipe and cavity are installed within the mounting space formed by the box body, providing ballast. The annular pipe is filled with liquid and equipped with a first drive unit that propels the liquid along the pipe. This provides angular momentum to the annular pipe upon contact with the liquid, driving its rotation relative to the box body. The cavity is filled with fluid and equipped with a second drive unit capable of driving the fluid to move along the cavity. This allows the second drive unit to adjust the angle between the axial direction of the annular pipe and the axial direction of the cylindrical surface, based on the swaying response of platforms such as semi-submersible floating wind turbines, thereby tilting the annular pipe and generating a precession torque. Simultaneously, the direction of the precession torque is adjusted by rotating the annular pipe relative to the housing, thus counteracting the environmental loads on the semi-submersible floating wind turbine platform and achieving sway reduction.

[0015] Other features and advantages of this disclosure will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the disclosure. Other advantages of this disclosure may be realized and obtained by means of the methods described in the description and the accompanying drawings. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] in: Figure 1 This is a schematic diagram of the pontoon of the semi-submersible floating wind turbine in an embodiment of this disclosure; Figure 2 This is a top view of the pontoon of the semi-submersible floating wind turbine in an embodiment of this disclosure; Figure 3 for Figure 2 Sectional view along line AA; Figure 4 This is a schematic diagram of the internal structure of the pontoon in one embodiment of the present disclosure; Figure 5for Figure 4 Side view; Figure 6 This is a schematic diagram of the clamps of the pontoon in one embodiment of the present disclosure; Figure 7 This is a schematic diagram of the internal structure of the pontoon in another embodiment of the present disclosure; Figure 8 for Figure 7 Another perspective illustration; Figure 9 This is a schematic diagram of the internal structure of the annular duct of a semi-submersible floating wind turbine in an embodiment of this disclosure; Figure 10 This is a schematic diagram of the internal structure of the annular duct of the semi-submersible floating wind turbine in an embodiment of this disclosure from another perspective. Figure 11 This is a schematic diagram of the assembly of the hub, guide vanes, and impeller of a semi-submersible floating wind turbine in an embodiment of this disclosure. Figure 12 This is a schematic diagram of the rotating assembly of the semi-submersible floating wind turbine in an embodiment of this disclosure after the rotating disk has been removed. Figure 13 This is a flow velocity distribution diagram of the annular duct of a semi-submersible floating fan in an embodiment of this disclosure without guide vanes. Figure 14 Flow velocity distribution diagram of the annular duct of the semi-submersible floating wind turbine in this embodiment of the present disclosure after installing guide vanes. Figure 15 This is a diagram showing the vertical velocity distribution of the annular duct of a semi-submersible floating fan in an embodiment of this disclosure without guide vanes. Figure 16 A diagram showing the vertical velocity distribution of the annular duct of a semi-submersible floating wind turbine in this embodiment of the present disclosure after a guide vane is installed. Figure 17 The diagram shows the turbulent kinetic energy of the annular duct of the semi-submersible floating fan in this embodiment of the present disclosure without the presence of guide vanes. Figure 18 Turbulent kinetic energy diagram of the annular duct of the semi-submersible floating wind turbine in this embodiment of the present disclosure after the guide vanes are installed.

[0018] Explanation of icon numbers: 10. Circular pipe; 11. First drive unit; 111. Guide vane; 112. Impeller; 12. Rotating assembly; 121. Fixed disk; 122. Rotating disk; 123. Clamp; 1231. Base; 1232. Vertical plate; 124. Inner ring plate; 125. Outer ring plate; 126. Bearing; 127. Hinge seat; 128. Hinge shaft; 13. Guide vane; 20. Cavity; 21. Second drive unit; 211. Pneumatic valve; 212. Inlet connector; 22. First pipe section; 23. Second pipe section; 30. Box; 31. Cylindrical surface; 32. Installation space; 100. Notch; 200. Mounting groove. Detailed Implementation

[0019] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0020] Please combine them together Figures 1 to 5 , Figure 7 and Figure 8 This disclosure provides a semi-submersible floating wind turbine. The semi-submersible floating wind turbine includes a pontoon, support columns (not shown), and a turbine body (not shown). Support columns are disposed on the pontoon. Multiple support columns can be present, evenly distributed about the pontoon's axis of symmetry. Adjacent support columns are connected by connecting arms to ensure overall structural stability. For example, three support columns can be present, arranged in a triangle and evenly distributed about the pontoon's axis of symmetry. The turbine body is disposed on the pontoon via the support columns, allowing it to float on the sea surface. When there are multiple support columns, the turbine body is disposed on one of them. The turbine body may include a nacelle, motor rotor blades, and a tower. The tower is disposed on the support column and houses the nacelle and motor rotor blades. The pontoon includes a box body 30, an annular duct 10, and a cavity 20. The outer circumferential surface of the box body 30 is cylindrical. The box body 30 encloses and forms an installation space 32. The annular duct 10 is coaxially arranged with the cylindrical surface 31, which facilitates active sway reduction control of the pontoon. The above-mentioned arrangement of the pontoon 30 can reduce the sensitivity of semi-submersible floating wind turbines and other platforms to the direction of environmental loads, and is also compatible with the arrangement of the annular duct 10 and the cavity 20.

[0021] An annular pipe 10 is installed in the installation space 32 and rotatably connected to the housing 30. The annular pipe 10 is filled with liquid, which can be pure water, seawater, or other aqueous solutions. The annular pipe 10 is provided with at least one first drive unit 11, which is configured to drive the liquid to move along the annular pipe 10. This allows the annular pipe 10 to generate angular momentum through the circulation of the liquid within the closed annular pipe 10, using the liquid as a medium.

[0022] The cavity 20 is connected to the annular pipe 10. The cavity 20 is filled with fluid, which can be a gas such as air, or a liquid that is the same as or different from the liquid filled in the annular pipe 10.

[0023] The cavity 20 is equipped with at least one second drive unit 21, which is configured to drive the fluid to move along the cavity 20. This adjusts the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31. Specifically, the coaxial arrangement of the annular pipe 10 and the cylindrical surface 31 can be adjusted so that the angle between their axes is arbitrary, or the angle can be adjusted to ensure coaxial alignment. The cavity 20, the fluid, and the second drive unit 21 work together to generate a precession effect, causing the annular pipe 10 to generate a precession torque opposite to the swaying torque of platforms such as semi-submersible floating fans. During this anti-sway process, the various structures of the float box do not require bearing support, fundamentally avoiding bearing wear problems and preventing the severe bearing wear and frictional heat dissipation issues encountered in anti-sway gyroscopes.

[0024] Compared with related technologies, implementing the embodiments of this disclosure will have the following beneficial effects: The aforementioned floating box design, when applied to semi-submersible floating wind turbines, not only enhances the turbine's buoyancy and submersion performance but also reduces its sensitivity to environmental load direction. Specifically, the floating box comprises a box body 30, an annular duct 10, and a cavity 20. The outer circumferential surface 31 of the box body 30 is cylindrical, which reduces the significant directional anisotropy of the floating box's geometry and prevents directional anisotropy from occurring on the outer circumferential surface of the box body 30, which is easily exposed to environmental loads. This, in turn, reduces the sensitivity of semi-submersible floating wind turbines and similar platforms to environmental load direction. The annular duct 10 and the cavity 20 are installed within the mounting space 32 formed by the box body 30, providing ballast. The annular pipe 10 is filled with liquid and is equipped with a first drive unit 11 that can drive the liquid to move along the annular pipe 10. This provides angular momentum to the annular pipe 10 when the liquid comes into contact with it, driving the annular pipe 10 to rotate relative to the housing 30. The cavity 20 is filled with fluid and is equipped with a second drive unit 21 that can drive the fluid to move along the cavity 20. Thus, based on the swaying response of the semi-submersible floating wind turbine or similar platform, the second drive unit 21 can adjust the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31, achieving tilting of the annular pipe 10 and generating a precession torque. Simultaneously, the rotation of the annular pipe 10 relative to the housing 30 adjusts the direction of the precession torque to counteract the environmental load on the semi-submersible floating wind turbine or similar platform, thereby reducing the sway of the platform.

[0025] In the exemplary embodiments, please refer to Figures 3 to 5 The cavity 20 is connected to the housing 30. The cavity 20 is annular and coaxially arranged with the cylindrical surface 31, so that the original centers of gravity of the housing 30 and the cavity 20 (when the second drive unit 21 does not change the distribution of fluid in the cavity 20) are collinear. The cavity 20 is configured to change its shape according to the movement of fluid in the cavity 20, thereby adjusting the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31 by changing its shape. In this embodiment, the cavity 20 is made of rubber. The lower end of the cavity 20 is completely connected to the housing 30, and the upper end of the cavity 20 surrounds the annular pipe 10 and is connected to the annular pipe 10, so that the deformation of the cavity 20 itself is limited by the housing 30 and the annular pipe 10 connected to it, ensuring the deformation accuracy of the cavity 20, and thus ensuring the adjustment accuracy of the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31. The annular pipe 10 is rotatably connected to the cavity 20 through the rotating assembly 12.

[0026] In the exemplary embodiments, please refer to Figures 4 to 6 and Figure 12The rotating assembly 12 includes a fixed disk 121 and a rotating disk 122, which are rotatably connected and coaxially arranged with the cylindrical surface 31. The fixed disk 121 is disposed in the cavity 20, which has a first mounting surface and a second mounting surface arranged opposite to each other along its axial direction. The first mounting surface is disposed in the housing 30 to increase the connection surface area between the cavity 20 and the housing 30, thereby improving connection stability. The second mounting surface is connected to the fixed disk 121 to increase the connection surface area between the cavity 20 and the rotating assembly 12, thereby improving connection stability. In this embodiment, both the fixed disk 121 and the rotating disk 122 are annular. The rotating disk 122 is provided with multiple clamps 123, which are evenly distributed around the axis of rotation of the rotating disk 122. In this embodiment, the number of clamps 123 is four. The clamp 123 includes a base 1231 and a vertical plate 1232. The vertical plate 1232 is mounted on the rotating disk 122 via the base 1231. Notches 100 are provided on both sides of the vertical plate 1232 along the radial direction of the rotating disk 122. This allows the vertical plate 1232 to have a certain elastic deformation capacity in both directions perpendicular to the vertical plate 1232 (due to the plate-like structure of the vertical plate 1232) and parallel to the vertical plate 1232, preventing plastic deformation of the clamp 123 during the generation of the precession torque, which would affect its service life and the accuracy of the precession torque. The vertical plate 1232 has a mounting groove 200 that matches the annular pipe 10. The mounting groove 200 increases the connection area between the vertical plate 1232 and the annular pipe 10, improving connection stability. The fixed disk 121 and the rotating disk 122 can be an overall annular plate structure, that is, the fixed disk 121 and the rotating disk 122 compensate for each other's missing parts, so that when they are fastened together, they can form an annular plate structure. The annular plate structure includes two ring-shaped structures that can rotate relative to each other, which constitute the fixed disk 121 and the rotating disk 122. Figure 12 As shown, in some embodiments, the rotating assembly 12 may further include an inner ring plate 124 and an outer ring plate 125, and a plurality of bearings 126 disposed between the inner ring plate 124 and the outer ring plate 125. One of the fixed disk 121 and the rotating disk 122 is connected to the inner ring plate 124, and the other is connected to the outer ring plate 125, and the bearings 126 improve the smoothness of relative rotation. By adopting the above-described direct drive method, the bearings 126 are integrated with the fixed disk 121 and the rotating disk 122. The stator (cavity 20) is directly connected to the fixed disk 121, and the rotor (annular pipe 10) is directly fixed to the rotating disk 122. This eliminates the traditional complex mechanical transmission components, resulting in a simpler and more stable design, and further improving the wave direction adaptability of semi-submersible floating wind turbines and other platforms.

[0027] In the exemplary embodiments, please refer to Figure 4 and Figure 5The second drive unit 21 includes a pneumatically controlled valve 211. It employs a pneumatic drive method, using a cavity 20 made of annular rubber material to achieve the forward movement of the annular pipe 10. This method offers advantages such as fast response speed, high reliability, and strong flow capacity. The cavity 20 has a first air chamber and a second air chamber, which are mirror-symmetrical about a plane. The axis of the cylindrical surface 31 lies on the plane. A pneumatically controlled valve 211 is located at the junction of the first and second air chambers. Correspondingly, the fluid is a gas such as air. In this embodiment, by controlling the opening or closing of the pneumatically controlled valve 211, the connection and isolation between the first and second air chambers are adjusted, changing the air pressure support force of the first and second air chambers, thereby achieving the forward movement of the annular pipe 10. This embodiment of the invention can ensure that the flow phase of the fluid is exactly opposite to the sway phase of the platform, such as a semi-submersible floating blower, by precisely controlling the opening and closing sequence of the pneumatic control valve 211, thus achieving the best anti-sway effect. It can also respond quickly in harsh sea conditions and reduce or close the pneumatic control valve 211 in calm sea conditions or when anti-sway is not required, saving energy. Furthermore, the sway period of platforms such as semi-submersible floating blowers is typically between a few seconds and tens of seconds. The pneumatic control valve 211 can complete its opening or closing action in a short time to achieve the precession movement of the annular pipe 10. The rubber-made cavity 20 has strong resistance to marine environmental corrosion, is lightweight and occupies little space, and can be highly integrated with the second drive unit 21, reducing external piping and wiring, improving reliability and facilitating installation. The air medium controlled by the pneumatic control valve 211 has low flow resistance, enabling rapid and low-energy pressure regulation of the cavity 20. It can automatically adjust control parameters according to real-time sea conditions, achieving an optimal balance between anti-sway effect and energy consumption. Furthermore, in this embodiment, the pneumatically controlled valve 211 is a butterfly valve, which has advantages such as low flow resistance, fast opening and closing, compact structure, light weight, relatively low cost, and suitability for large-diameter pipelines. In this embodiment, the second drive unit 21 also includes an air inlet connector 212 and an air compressor (not shown). The first air chamber and the second air chamber are each connected to at least one air inlet connector 212, and the air compressor can be connected to the air inlet connector 212 to supply air to the first and second air chambers. It can be understood that in other embodiments, the cavity 20 may also include one or more third air chambers, which, together with the first and second air chambers, divide the cavity 20 equally, further improving the control accuracy of the deformation of the cavity 20 itself. Correspondingly, the number of second drive units 21 is also appropriately increased to match the overall number of the first, second, and third air chambers.

[0028] In the exemplary embodiments, please refer to Figures 1 to 3The annular shape of the pontoon 30 brings the overall mass of the pontoon closer to the outer circumference, resulting in a larger moment of inertia. This enhances the pontoon's resistance to rolling and pitching under wind, waves, or eccentric loads, and increases its restoring torque. The central opening of the pontoon 30 allows some waves to pass through, reducing the overall wave force amplitude of the pontoon. This permeability also disrupts water resonance and suppresses heave (up and down) motion. In this embodiment, the freeboard of the pontoon 30 can be 9m, the waterline radius can be 30m, the draft can be 18m, the radius-to-draft ratio can be 1.67, and the displacement can be 50893.80t. The diameter of the annular pipe 10 can be 6m.

[0029] In the exemplary embodiments, please refer to Figure 7 and Figure 8 The fluid is a liquid, which may be the same as or different from the liquid filling the annular pipe 10. The cavity 20 includes a first pipe section 22 and a second pipe section 23. The first pipe section 22 spans the annular pipe 10 radially, and the second pipe section 23 spans the annular pipe 10 radially. The first pipe section 22 and the second pipe section 23 are mirror symmetrical about the annular pipe 10, so that in the initial state, the original centers of gravity of the box 30, the cavity 20, and the annular pipe 10 are collinear. The second drive unit 21 can drive the fluid to move the fluid in the first pipe section 22 and / or the second pipe section 23, adjust the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31, realize the tilting of the annular pipe 10, and generate a precession torque.

[0030] In the exemplary embodiments, please continue to refer to Figure 7 and Figure 8Both ends of the first pipe section 22 and both ends of the second pipe section 23 are connected to the annular pipe 10, making the cavity 20 and the annular pipe 10 connected and filled with the same liquid. The second drive unit 21 drives the liquid in the cavity 20 into the annular pipe 10, which can superimpose a velocity component perpendicular to the circulation of the annular pipe 10, thereby adjusting the angle between the axis of the annular pipe 10 and the axis of the cylindrical surface 31, realizing the tilting of the annular pipe 10, generating a precession torque, and improving the precession motion of the annular pipe 10 to be based on the motion of liquid particles. Furthermore, the second drive unit 21 can realize the vertical periodicity of the liquid particle motion superimposed on the circulation flow of the annular pipe 10 (the second drive unit 21 periodically drives the liquid), which can realize the periodic precession torque to counteract the swaying torque of waves and reduce the pitching motion of platforms such as semi-submersible floating wind turbines. Secondly, the second drive unit 21 enables constant vertical liquid particle motion superimposed on the annular pipe 10 (the second drive unit 21 provides constant drive to the liquid), achieving a constant precession torque to counteract the pitching torque of waves and reduce the pitching motion of platforms such as semi-submersible floating fans. The first pipe section 22 is equipped with the second drive unit 21, which is located on the axis of the cylindrical surface 31. The second pipe section 23 is also equipped with the second drive unit 21, which is located on the axis of the cylindrical surface 31. This ensures a one-to-one correspondence between the second drive unit 21 and the first and second pipe sections 22 and 23, allowing simultaneous movement of fluid within both sections, and enabling faster adjustment of the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31.

[0031] In an exemplary embodiment, the cavity 20 may also be isolated from the annular pipe 10. The second driving unit 21 drives the fluid to change the distribution of the fluid in the first pipe section 22 and / or the second pipe section 23, thereby changing the position of the center of gravity of the cavity 20 and adjusting the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31.

[0032] In the exemplary embodiments, please continue to refer to Figure 7 and Figure 8 The first pipe segment 22 gradually narrows from the annular pipe 10 toward the second drive unit 21. The second pipe segment 23 also gradually narrows from the annular pipe 10 toward the second drive unit 21. This makes both the first pipe segment 22 and the second pipe segment 23 narrower in the middle and wider at both ends, so that the middle position of the first pipe segment 22 and the second pipe segment 23 matches the second drive unit 21, making the fluid more concentrated and easier for the second drive unit 21 to drive. The wider ends of the first pipe segment 22 and the second pipe segment 23 can accommodate more liquid, making the overall mass of the fluid-filled cavity 20 closer to the annular pipe 10, and making the center of gravity of the cavity 20 and the annular pipe 10 more stable.

[0033] In the exemplary embodiments, please refer to Figure 7 , Figure 8 and Figure 12 The annular pipe 10 is rotatably connected to the box 30 via the rotating assembly 12; The rotating assembly 12 includes a fixed disk 121 and a rotating disk 122, which are rotatably connected and coaxially arranged with the cylindrical surface 31. The fixed disk 121 is disposed in the housing 30. In this embodiment, both the fixed disk 121 and the rotating disk 122 are annular. The rotating disk 122 is provided with two hinge seats 127, which are symmetrically arranged radially along the rotating disk 122. The annular pipe 10 is provided with hinge shafts 128 that are hinged to the hinge seats 127. The line connecting the two hinge shafts 128 is perpendicular to the plane of the cavity 20. This allows the velocity component perpendicular to the circulation, which is superimposed on the circulation of the annular pipe 10, to rotate around the line connecting the two hinge shafts 128 when the second driving unit 21 drives the fluid. This facilitates the rotation of the annular pipe 10 around the line connecting the two hinge shafts 128, thereby adjusting the angle between the axial direction of the annular pipe 10 and the axial direction of the cylindrical surface 31. The annular pipe 10 can rotate from 0° to 90° relative to the hinge seat 127. There are two first drive units 11, which are arranged in a one-to-one correspondence with the hinge shafts 128. The first drive units 11 are rotationally symmetrical about the corresponding hinge shafts 128.

[0034] In the exemplary embodiments, please refer to Figure 9 , Figure 10 and Figures 13 to 18 The annular pipe 10 is provided with multiple guide vanes 13, which extend along the extension direction of the annular pipe 10. The direction in which the guide vanes 13 protrude from the annular pipe 10 points towards the center line of the annular pipe 10, that is, the guide vanes 13 are perpendicular to the tangent of the pipe wall of the annular pipe 10 and point towards the center of the cross-section, consistent with the direction of the circulating flow. This can enhance the stability of the circulating flow of the liquid medium, thereby outputting a more accurate and stable fluid angular momentum to ensure the feasibility of motion control of the annular pipe 10. In this embodiment, the number of guide vanes 13 is 8, the included angle between adjacent guide vanes 13 is 45°, and the dimension of the guide vane 13 protruding from the annular pipe 10 is 5mm. Figures 13 to 16 It can be seen that the flow velocity distribution in both the direction and vertical directions is better before and after the flow guide vane 13 is installed in the annular pipe 10. From Figure 17 and Figure 18 It can be seen that the maximum value of turbulent kinetic energy in the horizontal cross-section of the annular pipe 10 before and after the guide vane 13 is installed decreases from 18.05 to 5.09, and the stability of the flow field is significantly enhanced, thereby reducing the fluctuation of angular momentum and improving the stability of the precession torque.

[0035] In an exemplary embodiment, the cavity 20 may also be provided with a flow guide 13 to improve the stability of the fluid flow field.

[0036] In the exemplary embodiments, please refer to Figure 4 , Figure 5 , Figure 7 , Figure 8 and Figure 11 Both the first drive unit 11 and the second drive unit 21 are shaftless rim-driven pumps. Figure 4 and Figure 5 As shown, the first drive unit 11 is located inside the annular pipe 10.

[0037] The first drive unit 11 is a shaftless rim-driven pump, used to offset the mechanical energy loss during the circulating flow in the annular pipe 10, giving the circulating liquid medium angular momentum. The second drive unit 21 is a shaftless rim-driven pump, used to drive liquid particles to form a precession motion superimposed on the circulating flow, which can generate a precession torque to offset the pitching or rolling motion of platforms such as semi-submersible floating fans based on the precession effect. Compared with traditional blade drive devices, the shaftless rim-driven pump eliminates the transmission shaft system and adopts an integrated design of motor and drive blades, improving drive efficiency and reducing vibration and noise. In addition, the shaftless rim-driven pump makes the pipe diameter of the annular pipe 10 and cavity 20 uniform, and also effectively improves the sealing of the annular pipe 10 and cavity 20, enhancing the reliability of the operation of the annular pipe 10 and cavity 20. The shaftless rim-driven pump includes guide vanes 111 and impeller 112 arranged sequentially. The guide vanes 111 and impeller 112 are respectively installed within annular pipe 10 and cavity 20, and are rotatably connected to the annular pipe 10 and cavity 20. A motor is installed inside the annular pipe 10 and cavity 20 as the drive device, eliminating the need for shaft transmission, reducing the complexity of the drive system of the annular pipe 10 and cavity 20, and improving the stability of the anti-sway control.

[0038] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0039] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of those features.

[0040] In the description of this disclosure, "multiple" means at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

[0041] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0042] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0044] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A floating box, characterized in that, include: The enclosure has a cylindrical outer circumference, and the enclosure together forms an installation space. A circular annular pipe is coaxially arranged with the cylindrical surface. The circular annular pipe is installed in the installation space and rotatably connected to the box body. The circular annular pipe is filled with liquid. The circular annular pipe is provided with at least one first driving unit, which is configured to drive the liquid to move the liquid along the circular annular pipe. and A cavity is connected to the annular pipe and filled with fluid. The cavity is provided with at least one second driving unit, which is configured to drive the fluid to move along the cavity to adjust the angle between the axial direction of the annular pipe and the axial direction of the cylindrical surface.

2. The pontoon according to claim 1, characterized in that, The cavity is connected to the box body; The cavity is annular and coaxially arranged with the cylindrical surface; The cavity is configured to change its shape according to the movement of fluid within it; The annular pipe is rotatably connected to the cavity via a rotating assembly.

3. The pontoon according to claim 2, characterized in that, The rotating assembly includes a fixed disk and a rotating disk, which are rotatably connected and coaxially arranged with the cylindrical surface, respectively. The fixed disk is disposed in the cavity, and the rotating disk is provided with multiple clamps, which are evenly distributed around the rotating shaft of the rotating disk; The clamp includes a base and a vertical plate. The vertical plate is mounted on the rotating disk via the base. The vertical plate has notches on both sides arranged radially along the rotating disk, and the vertical plate has an installation groove that matches the annular pipe.

4. The pontoon according to claim 2, characterized in that, The second drive unit includes a pneumatically controlled valve; The cavity has a first air chamber and a second air chamber, the first air chamber and the second air chamber are mirror-symmetrical about a plane, and the axis of the cylindrical surface is located in the plane; The air control valve is installed at the junction of the first air chamber and the second air chamber.

5. The pontoon according to any one of claims 1 to 4, characterized in that, The box is ring-shaped.

6. The pontoon according to claim 1, characterized in that, The fluid is a liquid; The cavity includes a first pipe section and a second pipe section; The first pipe segment spans the annular pipe radially, and the second pipe segment spans the annular pipe radially. The first pipe segment and the second pipe segment are mirror symmetrical about the annular pipe.

7. The pontoon according to claim 6, characterized in that, Both ends of the first pipe section and both ends of the second pipe section are connected to the annular pipe.

8. The pontoon according to claim 7, characterized in that, The first pipe segment is equipped with the second driving unit, which is located on the axis of the cylindrical surface; The second pipe segment is equipped with the second drive unit, which is located on the axis of the cylindrical surface.

9. The pontoon according to claim 1, characterized in that, The first drive unit is a shaftless rim-driven pump.

10. A semi-submersible floating wind turbine, characterized in that, include: The pontoon as described in any one of claims 1 to 9; A support column is provided on the pontoon; and The wind turbine body is mounted on the floating box via the support column.

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