A floating semi-submersible platform and offshore power generation system

Abstract

This application discloses a floating semi-submersible platform and an offshore power generation system. A heave assembly is connected to the bottom of the platform component. The heave assembly includes at least two sets, each set having at least two heave plates arranged from top to bottom. The vertical movement of the heave assembly increases added mass and provides viscous damping, dissipating the platform's kinetic energy in the vertical direction and reducing the amplitude of the platform's vertical movement. The platform component and the heave assembly are connected by a universal joint with at least two degrees of freedom, allowing the heave assembly to generate angular displacement relative to the platform component in at least two directions. Thus, in the event of roll or pitch, the angular displacement generated by the heave assembly relative to the platform component creates an inertial torque opposite to the platform's sway direction, reducing the platform's sway on the horizontal plane, improving the platform's ability to suppress complex loads, and enhancing the platform's stability.

Description

Technical Field

[0001] This application relates to the field of offshore floating power generation equipment technology, and more specifically, to a floating semi-submersible platform and an offshore power generation system. Background Technology

[0002] As offshore wind power expands into deeper waters, traditional nearshore column-mounted platforms are too expensive and difficult to adapt to the depths of deep water. Therefore, semi-submersible platforms have become the mainstream configuration for floating wind power in deep waters. The main purpose of semi-submersible platforms is to provide a supporting foundation for wind turbine units and ensure the long-term safe operation of wind turbines.

[0003] In deep-sea environments, floating platforms undergo heave, roll, and pitch motion responses under the combined loads of wind, waves, and currents. This can lead to fatigue damage to the platform and wind turbine, severely affecting the service life of the wind power system. However, current floating platforms can usually only suppress heave responses and have poor suppression effects on combined loads, resulting in poor stability during platform operation and affecting power generation efficiency.

[0004] In conclusion, improving platform stability is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of this application is to provide a floating semi-submersible platform and an offshore power generation system to improve platform stability.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A floating semi-submersible platform includes: a platform assembly, the bottom of which is connected to a heave assembly, the heave assembly comprising at least two groups, each group of the heave assembly having at least two heave plates arranged from top to bottom; wherein the platform assembly and the heave assembly are connected by a universal joint, the universal joint having at least two degrees of freedom, so that the heave assembly can generate angular displacement relative to the platform assembly in at least two directions.

[0008] In some embodiments, the platform component includes a central column, which is connected to three side columns via cross braces. The three side columns are evenly distributed around the central column. A lower float is provided at the bottom of the central column and the side columns. A heave assembly is connected to the bottom of the side columns via a universal joint. There are three sets of heave assemblies, each corresponding to one of the side columns.

[0009] In some embodiments, the universal joint is a cross-shaped universal joint; the cross-shaped universal joint includes a first connecting member, a second connecting member, and a cross-shaped shaft body; the first connecting member includes a bearing, a first bearing seat, a rotating shaft, an upper connecting flange, and a second bearing seat; the top end of the first connecting member is connected to the bottom surface of the side column through the upper connecting flange, and the second bearing seat is rotatably engaged with the upper connecting flange through the rotating shaft, and the second bearing seat can rotate 360° around the rotating shaft;

[0010] The bottom end of the first connector is rotatably engaged with two journals in the first direction of the cross shaft body; the top end of the second connector is rotatably engaged with two journals in the second direction of the cross shaft body; and the bottom end of the second connector is fixedly installed with the sway assembly; the first direction and the second direction are perpendicularly distributed.

[0011] In some embodiments, the first connector, the second connector, and the cross shaft are all rotatably coupled through the bearing; the bearing is mounted on the journal end of the cross shaft, and the bearing is provided with the first bearing seat, which is mounted at the corresponding positions of the first connector and the second connector.

[0012] In some embodiments, the cross shaft is forged from hardened stainless steel, and the journal end surface of the cross shaft has a carburized and quenched hardened layer.

[0013] In some embodiments, a sealing assembly is provided between the bearing and the cross shaft, and the bearing is lubricated by an auxiliary circulating lubrication system; the sealing assembly includes a labyrinth dust ring, an X-shaped fluororubber seal ring, and a mechanical seal ring arranged in sequence; the auxiliary circulating lubrication system includes a lubrication pipeline and a micro pump, and the lubrication pipeline pumps grease into the cavity of the bearing through the micro pump so that the pressure inside the cavity of the bearing is greater than the external seawater pressure.

[0014] In some embodiments, the universal joint is a ball cage universal joint, a ball fork universal joint, or a three-pin universal joint.

[0015] In some embodiments, the sway assembly further includes a lower connecting flange and a connecting column fixedly connected to the bottom of the lower connecting flange, the lower connecting flange being fixedly connected to the bottom end of the second connecting member; at least two sway plates are sequentially and fixedly connected to the connecting column at intervals, the bottom end of the connecting column being a free-hanging structure.

[0016] In some embodiments, there are four heave plates, which are arranged from top to bottom as a first heave plate, a second heave plate, a third heave plate, and a fourth heave plate; the thickness of the fourth heave plate is greater than the thickness of the first heave plate, the second heave plate, and the third heave plate, and each of the first heave plate, the second heave plate, the third heave plate, and the fourth heave plate has a plurality of through holes, which are equidistantly distributed along the circumference of the first heave plate, the second heave plate, the third heave plate, and the fourth heave plate.

[0017] An offshore power generation system, comprising a floating semi-submersible platform as described above.

[0018] The floating semi-submersible platform provided in this application includes a platform assembly, the bottom of which is connected to a heave assembly. The heave assembly includes at least two sets, each set having at least two heave plates arranged from top to bottom. The vertical movement of the heave assembly increases the added mass and provides viscous damping to dissipate the platform's kinetic energy in the vertical direction and reduce the amplitude of the platform's vertical movement. The platform assembly and the heave assembly are connected by a universal joint with at least two degrees of freedom, allowing the heave assembly to generate angular displacement relative to the platform assembly in at least two directions. Thus, in the event of roll or pitch, the angular displacement generated by the heave assembly relative to the platform assembly creates an inertial torque opposite to the platform's sway direction, reducing the platform's swaying on the horizontal plane, improving the platform's suppression of complex loads, and enhancing the platform's stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application 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 embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of the floating semi-submersible platform provided in the embodiments of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the heave component provided in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the cross-shaped universal joint provided in the embodiments of this application;

[0023] Figure 4 for Figure 3 The diagram shows a sealing assembly in a cross-shaped universal joint.

[0024] Explanation of reference numerals in the attached figures:

[0025] 110 - Central column, 120 - Horizontal brace, 130 - Side column, 140 - Lower floating body;

[0026] 200-Heave assembly, 210-Lower connecting flange, 220-Connecting column, 231-First heave plate, 232-Second heave plate, 233-Third heave plate, 234-Fourth heave plate;

[0027] 300 - Universal joint of cross shaft; 310 - First connecting piece; 320 - Second connecting piece; 330 - Cross shaft body;

[0028] 410 - Bearing, 420 - First bearing housing, 430 - Rotating shaft, 440 - Upper connecting flange, 450 - Second bearing housing;

[0029] 500 - Sealing assembly, 510 - Labyrinth dust ring, 520 - X-shaped fluororubber seal, 530 - Mechanical seal ring;

[0030] 610 - Lubrication lines. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The terminology used in the following embodiments is for the purpose of describing specific embodiments only and is not intended to be a limitation of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0033] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0034] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0035] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0036] The “plane” referred to in this application is a “plane that is substantially parallel to the horizontal plane” in actual operation.

[0037] like Figure 1 As shown in the embodiment of this application, the floating semi-submersible platform includes a platform component. The bottom end of the platform component is connected to a heave component 200. The heave component 200 includes at least two sets. Each set of heave components 200 has at least two heave plates arranged from top to bottom. By moving the heave component 200 in the vertical direction, additional mass is added and viscous damping is provided to dissipate the kinetic energy of the platform in the vertical direction, reduce the amplitude of the platform's movement in the vertical direction, and improve the platform's heave response.

[0038] The platform assembly and the heave assembly 200 are connected by a universal joint, which has at least two degrees of freedom, allowing the heave assembly 200 to generate angular displacement relative to the platform assembly in at least two directions. Thus, when the platform rolls or pitches, the heave assembly 200, located underwater, lags behind the platform assembly in motion response due to its own enormous weight, rotational inertia, and water resistance. This inertial lag allows the heave assembly 200 to generate angular displacement with the platform assembly through the universal joint, forming an inertial stabilizing torque opposite to the platform's swaying direction. This resists the platform's swaying on the horizontal plane, improving the platform's suppression effect on complex loads and enhancing its stability.

[0039] Furthermore, the heave component 200 in this application also has adaptability. The greater the platform sway amplitude, the more significant the inertial hysteresis effect of the heave component 200, the greater the relative angular displacement generated, and the stronger the inertial stabilizing torque and damping energy consumption. The anti-sway effect is automatically improved, enabling the core anti-sway and anti-sway function of the overall structure to work passively, and it has good adaptability.

[0040] It should be noted that heave response refers to the dynamic response of a floating structure at sea to wave action in the vertical direction. Specifically, when waves pass over a floating platform, the wave crests and troughs alternately act on the bottom of the platform, causing it to rise and sink periodically. This reciprocating motion in the vertical direction is called heave motion, and the amplitude, velocity, acceleration, and related dynamic characteristics of the platform's heave motion are collectively referred to as heave response. For floating semi-submersible platforms at sea, heave response is a key indicator affecting their motion stability and operational performance. Excessive heave response can lead to the following problems: reduced power generation efficiency, as the platform's violent up-and-down movement is transmitted to the onboard wind turbine, causing the rotor to misalign with the wind and increasing blade vibration, thereby reducing wind energy capture efficiency. It can also affect the solar panel's angle to the sun, reducing photovoltaic power generation; increased structural fatigue load, as frequent heave motion generates alternating stress on the platform structure, mooring system, and wind turbine tower, accelerating fatigue damage and shortening equipment life; and impact on operational safety, as large heaves in extreme sea conditions may cause platform instability, capsizing, or impact with mooring cables, threatening overall safety.

[0041] It should be noted that rolling refers to the reciprocating tilting motion of a platform about its longitudinal axis (the axis in the bow-stern direction). Simply put, it is the alternating rise and fall of the left and right sides of the platform, like the swaying of a ship from side to side. For triangular or symmetrical platforms, rolling usually manifests as a swaying motion along a certain horizontal axis.

[0042] It should be noted that pitch refers to the reciprocating tilting motion of a platform around its horizontal axis (the axis in the left-right direction). That is, the front and rear ends of the platform alternately rise and fall, similar to a nodding motion. Roll and pitch are collectively referred to as swaying motion. When a platform rolls or pitches, its center of gravity and center of buoyancy shift horizontally, and the restoring torque attempts to pull the platform back to its equilibrium position. However, under the periodic forcing effect of waves, if the wave frequency is close to the platform's inherent roll / pitch frequency, resonance will occur, causing a sharp amplification of the swaying amplitude and affecting the platform's stability.

[0043] like Figure 1As shown, the platform component includes a central column 110, which is connected to side columns 130 via cross braces 120. There are three side columns 130, which are evenly distributed around the central column 110. The cross braces 120 correspond one-to-one with the side columns 130, forming a triangular truss structure with the central column 110, cross braces 120, and side columns 130. This allows the wave load to be evenly distributed among the three side columns 130, significantly enhancing the overall stiffness and overturning resistance of the platform component, thereby improving the stability of the platform component.

[0044] like Figure 1 As shown, a lower floating body 140 is provided at the bottom of the central column 110 and the side columns 130. The lower floating body 140 is a corresponding triangular structure to reduce the occupied area and improve stability.

[0045] Among them, the heave assembly 200 is connected to the bottom end of the side column 130 through a universal joint. There are three sets of heave assemblies 200, and each heave assembly 200 corresponds to a side column 130. This allows the three sets of heave assemblies 200 to cover the swaying motion of the platform in the circumferential direction, thereby achieving omnidirectional balanced suppression of the swaying motion of the platform. This overcomes the defect of weak suppression effect in certain directions when the asymmetrical arrangement is used, and further improves the stability of the platform.

[0046] In some embodiments, such as Figures 3-4 As shown, the universal joint is a cross-shaft universal joint 300, which includes a first connecting member 310, a second connecting member 320, and a cross-shaft body 330.

[0047] The top end of the first connector 310 is fixedly installed on the bottom surface of the side column 130 via the upper connecting flange 440. The bottom surface of the upper connecting flange 440 is connected to a rotating shaft 430. The rotating shaft 430 is rotatably connected to a second bearing seat 450 so that the second bearing seat 450 can rotate 360° relative to the rotating shaft 430. The bottom end of the first connector 310 is rotatably engaged with two journals in the first direction of the cross shaft body 330. The top end of the second connector 320 is rotatably engaged with two journals in the second direction of the cross shaft body 330. The bottom end of the second connector 320 is fixedly installed with a sway assembly 200, and the first direction and the second direction are perpendicularly distributed.

[0048] It is understandable that a bearing is installed in the second bearing housing 450 to enable the second bearing housing 450 to rotate relative to the rotating shaft 430, which will not be elaborated here.

[0049] This allows the heave assembly 200 to independently generate angular displacement in both the roll and pitch directions relative to the platform assembly, and enables the heave assembly 200 to rotate around the rotation axis 430. This allows the heave assembly 200 to suppress the platform's swaying motion through its angular displacement relative to the platform assembly. The universal joint 300 serves as the connection node, resulting in a compact structure that ensures the reliability and stability of the structure, further guaranteeing the stable operation of the platform.

[0050] In this application, to ensure the stability of the rotational engagement between the cross shaft body 330 and the first connecting member 310 and the second connecting member 320, such as Figure 3 As shown, the first connecting member 310, the second connecting member 320 and the cross shaft body 330 are all rotatably connected by bearings 410, and the bearings 410 are all heavy-duty bearings. The heavy-duty bearings have higher rated dynamic load and static load, and can reliably withstand the huge radial force, axial force and overturning moment generated by the heave assembly 200 during operation, so as to avoid plastic deformation or fracture failure due to insufficient bearing capacity of the bearings 410 under extreme sea conditions.

[0051] In this application, bearing 410 can be a double-row tapered roller bearing. The double-row tapered roller bearing can achieve precise axial positioning through preload clearance, and can simultaneously bear and transmit huge axial loads in both directions. In addition, the double-row tapered roller bearing itself has a very large effective span, which can withstand huge overturning moments with a single bearing, so as to further ensure structural rigidity.

[0052] like Figure 3 The bearing 410 is installed on the journal end of the cross shaft body 330, and the bearing 410 is equipped with a first bearing seat 420. The first bearing seat 420 is installed at the corresponding positions of the first connector 310 and the second connector 320, so as to provide stable support for the bearing 410 through the first bearing seat 420, so as to ensure the stable operation of the bearing 410.

[0053] In this application, the cross shaft body 330 is forged from 17-4PH precipitation hardening stainless steel, which has extremely high tensile strength and good impact toughness, and can reliably withstand alternating bending and shear loads to ensure the safety and reliability of the structure. In addition, 17-4PH precipitation hardening stainless steel has good resistance to pitting corrosion and crevice corrosion, and its high corrosion resistance can effectively inhibit the initiation of corrosion fatigue cracks, which greatly reduces the risk of sudden fracture of the cross shaft body 330 due to corrosion fatigue.

[0054] In this application, the journal end surface of the cross shaft body 330 has a carburized and quenched hardened layer, which gives it extremely high surface hardness and forms a hard and wear-resistant surface layer. This hardened layer can effectively resist wear during long-term contact between the journal end of the cross shaft body 330 and the bearing 410, thereby ensuring long-term stability of the rotational fit and extending the service life.

[0055] In this application, such as Figure 4 As shown, a sealing assembly 500 is provided between the bearing 410 and the cross shaft body 330, and the bearing 410 is lubricated by an auxiliary circulating lubrication system.

[0056] Specifically, the sealing assembly 500 includes a labyrinthine dustproof ring 510, an X-shaped fluororubber sealing ring 520, and a mechanical seal ring 530 arranged sequentially, forming a three-level sealing protection system to progressively prevent seawater erosion. First, the labyrinthine dustproof ring 510, composed of multiple concentric annular grooves, forms a non-contact, tortuous path with the journal of the cross shaft body 330, preventing the attachment of large particles and marine organisms while reducing the kinetic energy of seawater. Next, the X-shaped fluororubber sealing ring 520, made of fluororubber material with an X-shaped cross-section, forms a double-lip interference fit with the journal surface, utilizing its excellent elastic compensation capability and seawater aging resistance to prevent fine particles and minor water seepage. Finally, the mechanical seal ring 530 provides a stable and durable sealing interface during the rotation and oscillation of the bearing 410. The synergistic effect of these three levels of sealing ensures that the bearing 410 cavity remains clean and dry during long-term underwater operation.

[0057] The auxiliary circulating lubrication system includes a lubrication line 610 and a micro pump. The lubrication line 610 pumps grease into the cavity of the bearing 410 through the micro pump, so that the pressure inside the cavity of the bearing 410 is greater than the external seawater pressure. This causes the lubricating grease to continuously seep out in small amounts to form a protective film, preventing seawater from seeping into the cavity and further improving the protection effect on the bearing 410.

[0058] In other embodiments, the universal joint can also be a ball cage universal joint, a ball fork universal joint, or a three-pin universal joint, so that the universal joint can provide 360° rotational freedom to resist loads from multiple directions and further improve the stability of the platform.

[0059] like Figures 1-2 As shown, the helical assembly 200 also includes a lower connecting flange 210 and a connecting column 220 fixedly connected to the bottom of the lower connecting flange 210. The lower connecting flange 210 is fixedly connected to the bottom end of the second connecting member 320 to realize the installation and fixation of the helical assembly 200 and the universal joint.

[0060] At least two heave plates are fixedly connected to the connecting column 220 at intervals. The bottom end of the connecting column 220 is a free-hanging structure, making the heave assembly 200 a rigid structure as a whole. This ensures that all heave plates maintain completely synchronized displacement and velocity when the heave assembly 200 moves relative to the water body. This avoids the phase lag or amplitude attenuation of the heave plates that may be caused by flexible connections. It ensures that the additional mass effect and vortex shedding damping generated by each heave plate can be superimposed in phase to form a resultant force, which significantly improves the heave suppression efficiency per unit structural weight. Furthermore, by rigidly connecting them into a whole, the heave assembly 200 can be installed as a whole module, improving installation efficiency.

[0061] In some embodiments, two, three, four, five, or more sway plates may be sequentially connected to a connecting column 220, and the selection can be made according to the actual situation. This application embodiment does not limit this.

[0062] For example, such as Figure 2 As shown, there are four heave plates, from top to bottom: first heave plate 231, second heave plate 232, third heave plate 233, and fourth heave plate 234. The thickness of the fourth heave plate 234 is greater than that of the first heave plate 231, second heave plate 232, and third heave plate 233 to ensure a lower overall center of gravity. This lower center of gravity of the heave assembly 200, provided that the universal joint provides the degree of freedom of swing, generates a greater gravity restoring torque. This allows the heave assembly 200 to recover to a vertical, natural suspended state more quickly and stably after wave disturbance, enhancing its self-correcting ability as a passive damped pendulum and ensuring the continuous and stable performance of motion suppression.

[0063] In this application, the thickness of the first sway plate 231, the second sway plate 232, and the third sway plate 233 is 2m, the thickness of the fourth sway plate 234 is 4m, and the diameter of the first sway plate 231, the second sway plate 232, the third sway plate 233, and the fourth sway plate 234 is 12m. The spacing between the sway plates is 0.8 to 1 times the diameter of the sway plate.

[0064] like Figure 2As shown, several through holes are provided on the first heave plate 231, the second heave plate 232, the third heave plate 233, and the fourth heave plate 234. These through holes are equidistantly distributed circumferentially along the first heave plate 231, the second heave plate 232, the third heave plate 233, and the fourth heave plate 234, with an opening ratio of 5%. When the heave assembly 200 heaves relative to the water body, the water flow passing through the through holes will generate additional flow separation and vortex shedding at the hole edges. The equidistantly distributed through holes in the circumferential direction make this vortex shedding uniformly distributed along the plate surface, forming a large number of small-scale but significantly energy-dissipating wake structures. The additional damping generated by these small holes works synergistically with the large-scale vortex shedding at the outer edge of the heave plate, significantly improving the total viscous damping coefficient of the heave plate, enhancing the suppression efficiency of the platform's heave motion, and further improving the platform's stability.

[0065] The floating semi-submersible platform provided in this application embodiment increases the added mass and provides viscous damping through the vertical movement of the heave assembly 200, thereby dissipating the kinetic energy of the platform in the vertical direction, reducing the amplitude of the platform's vertical movement, and improving the platform's heave response. The platform assembly and the heave assembly 200 are connected by a universal joint with at least two degrees of freedom, allowing the heave assembly 200 to generate angular displacement relative to the platform assembly in at least two directions. Thus, when the platform experiences roll or pitch, the underwater heave assembly 200, due to its enormous weight, rotational inertia, and water resistance, lags behind the platform assembly in its motion response. This inertial lag allows the heave assembly 200 to generate angular displacement with the platform assembly through the universal joint, forming an inertial stabilizing torque opposite to the platform's sway direction to resist the platform's swaying on the horizontal plane, improving the platform's suppression of complex loads and enhancing its stability.

[0066] This application also provides an offshore power generation system, which includes the floating semi-submersible platform described in the above embodiments.

[0067] Since the aforementioned floating semi-submersible platform has the aforementioned technical effects, and the aforementioned offshore power generation system includes the aforementioned floating semi-submersible platform, the aforementioned offshore power generation system also has the corresponding technical effects, which will not be elaborated here.

[0068] The above description of the embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A floating semi-submersible platform, characterized in that, include: A platform component, the bottom of which is connected to a heave component (200), the heave component (200) includes at least two groups, and each group of the heave component (200) has at least two heave plates arranged from top to bottom; The platform component and the heave component (200) are connected by a universal joint, which has at least two degrees of freedom, so that the heave component (200) can generate angular displacement in at least two directions relative to the platform component.

2. The floating semi-submersible platform according to claim 1, characterized in that, The platform component includes a central column (110), which is connected to side columns (130) via cross braces (120). There are three side columns (130), which are evenly distributed around the central column (110) at equal intervals. The bottom of the central column (110) and the side columns (130) is provided with a lower floating body (140). The heave assembly (200) is connected to the bottom end of the side column (130) via the universal joint. There are three sets of heave assemblies (200), and each heave assembly (200) corresponds to one side column (130).

3. The floating semi-submersible platform according to claim 2, characterized in that, The universal joint is a cross-shaped universal joint (300). The cross-shaft universal joint (300) includes a first connector (310), a second connector (320), and a cross-shaft body (330). The first connecting member (310) includes a bearing (410), a first bearing housing (420), a rotating shaft (430), an upper connecting flange (440), and a second bearing housing (450). The top end of the first connector (310) is connected to the bottom surface of the side column (130) through the upper connecting flange (440). The second bearing seat (450) and the upper connecting flange (440) are rotatably engaged through the rotating shaft (430). The second bearing seat (450) can rotate 360° around the rotating shaft (430). The bottom end of the first connector (310) is rotatably engaged with two journals in the first direction of the cross shaft body (330); The top end of the second connector (320) is rotatably engaged with two journals in the second direction of the cross shaft body (330), and the bottom end of the second connector (320) is fixedly installed with the sway assembly (200). The first direction and the second direction are perpendicularly distributed.

4. The floating semi-submersible platform according to claim 3, characterized in that, The first connector (310), the second connector (320), and the cross shaft body (330) are all rotatably connected through the bearing (410); The bearing (410) is mounted on the journal end of the cross shaft body (330), and the bearing (410) is provided with the first bearing seat (420), which is mounted at the corresponding positions of the first connector (310) and the second connector (320).

5. The floating semi-submersible platform according to claim 4, characterized in that, The cross shaft body (330) is forged from hardened stainless steel, and the journal end surface of the cross shaft body (330) has a carburized and quenched hardened layer.

6. The floating semi-submersible platform according to claim 4, characterized in that, A sealing assembly (500) is provided between the bearing (410) and the cross shaft body (330), and the bearing (410) is lubricated by an auxiliary circulating lubrication system; The sealing assembly (500) includes a labyrinth dustproof ring (510), an X-shaped fluororubber sealing ring (520), and a mechanical sealing ring (530) arranged in sequence. The auxiliary circulating lubrication system includes a lubrication pipeline (610) and a micro pump. The lubrication pipeline (610) pumps grease into the cavity of the bearing (410) through the micro pump so that the pressure inside the cavity of the bearing (410) is greater than the external seawater pressure.

7. The floating semi-submersible platform according to claim 2, characterized in that, The universal joint is a ball cage type universal joint, a ball fork type universal joint, or a three-pin type universal joint.

8. The floating semi-submersible platform according to claim 3, characterized in that, The heave assembly (200) further includes a lower connecting flange (210) and a connecting column (220) fixedly connected to the bottom of the lower connecting flange (210), wherein the lower connecting flange (210) is fixedly connected to the bottom end of the second connecting member (320); At least two of the sway plates are fixedly connected to the connecting column (220) at intervals in sequence, and the bottom end of the connecting column (220) is a free-hanging structure.

9. The floating semi-submersible platform according to claim 8, characterized in that, There are four heave plates, which are, from top to bottom, the first heave plate (231), the second heave plate (232), the third heave plate (233) and the fourth heave plate (234). The thickness of the fourth sway plate (234) is greater than the thickness of the first sway plate (231), the second sway plate (232), and the third sway plate (233). The first sway plate (231), the second sway plate (232), the third sway plate (233), and the fourth sway plate (234) are all provided with a plurality of through holes. The plurality of through holes are equidistantly distributed along the circumference of the first sway plate (231), the second sway plate (232), the third sway plate (233), and the fourth sway plate (234).

10. An offshore power generation system, characterized in that, Including the floating semi-submersible platform as described in any one of claims 1-9.

Images