Tower-barrel-free wind-direction-self-adaptive offshore floating type draught fan device

Abstract

According to the tower-drum-free offshore floating type fan device capable of self-adapting to the wind direction, the common design that a single vertical floating tower drum supports a fan is replaced, the fan assembly located at the top tip end is supported by the tower assembly in the shape of the conical frame, and the bottom face of the conical frame is in the shape of the isosceles triangle; the mooring assembly is connected to the vertex of the isosceles triangle, the buoy pieces are symmetrically arranged at the two symmetrical end points of the isosceles triangle, and due to the distribution mode of mooring and buoys, the buoy pieces can be stably semi-sunk or completely sunk into water; the stress design of the symmetrical floating supports on the other side can provide good frame posture stability, the stability and safety of fan power generation work are guaranteed, compared with a traditional floating tower cylinder design, the conical frame adopted in the design is less in material consumption of a fan support, the support design is more flexible, and the design and construction cost can be effectively saved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction. Background Art

[0002] In recent years, the development trend of offshore wind turbines in deep water and large scale has become more and more obvious. With this trend, the construction cost and installation difficulty of offshore fixed wind turbine foundations have increased significantly, and they are no longer the main choice from an economic point of view. However, floating wind turbine foundations have become the first choice for deep-sea wind energy development due to their good economy and stability. Since the deep-sea area is wider, the wind energy resources are richer, the wind speed is more stable, and there will be no conflict with offshore fishing grounds and shipping routes, with the gradual saturation of onshore and even intertidal zones and offshore positions, the construction of wind farms towards the deep-sea has become an inevitable trend, and is showing an accelerating development trend.

[0003] At present, offshore floating wind turbines are basically connected to the upper wind turbine and the lower underwater buoy through a single variable diameter tower. The tower is subjected to complex forces and deformations during the dynamic response of the wind turbine, and is prone to nonlinear dynamic response. In order to ensure that the tower has safe structural strength and stability, the structural dimensions of the tower are usually designed to be relatively conservative, and there is unnecessary redundancy in the design, which leads to increased design and construction costs of the wind turbine.

[0004] In summary, the existing floating wind power equipment has a technical problem that the structure of the lower tower of the wind turbine has a redundant and high cost due to complex stress conditions. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing floating wind power equipment has complex stress conditions, resulting in a technical problem that the structure of the lower tower of the wind turbine has redundancy and high cost.

[0006] To solve the above problems, the present invention provides a tower-free and self-adaptive offshore floating wind turbine device, comprising a wind turbine assembly, a tower assembly and a mooring assembly, wherein the tower assembly is a conical frame with an isosceles triangle at the bottom, the wind turbine assembly is connected to the top point of the cone of the tower assembly, both bottom corners of the bottom of the tower assembly are connected to buoys, and the mooring assembly is connected to the top angle of the triangle at the bottom of the tower assembly; the mooring assembly comprises a mooring barrel shell and a mooring barrel rotating shaft that are coaxially sleeved and rotatably connected to each other, the mooring barrel shell is fixedly connected to the tower assembly, and the mooring barrel rotating shaft is connected to anchoring tendons, which are used for anchoring to the seabed.

[0007] The present invention provides a floating wind turbine device whose foundation structure is different from that of existing floating wind turbines. The design of supporting the wind turbine with a commonly used single vertical floating tower is abandoned, and a conical frame-shaped tower assembly is adopted to support the wind turbine assembly located at the top tip. The bottom surface of the conical frame is an isosceles triangle, and the mooring assembly is connected to the vertex of the isosceles triangle. The two ends of the isosceles triangle are symmetrically provided with buoys. Due to the distribution of the mooring and the buoys, the buoy can be stably half-sunk or completely sunk underwater. The force-bearing design of the symmetrical floating support on the other side through pulling at one end can provide good frame posture stability, thereby ensuring the stability and safety of the wind turbine power generation operation. The conical frame adopted in this design uses less material for the wind turbine bracket compared to the traditional floating tower design, and the bracket design is more flexible, which can effectively save design and construction costs.

[0008] A specific structural design of an optimal mooring component is provided. Since the mooring component and the tower component are rotatably connected, it helps to maintain the stability of the tower component's posture, improve the wind performance of the wind turbine, and improve the power generation efficiency. In order to achieve this effect, the mooring component adopts an internal and external rotating sleeve design, and one of the mooring barrel shell and the mooring barrel shaft that are rotatably connected to each other is connected to the tower assembly, and the other is connected to the anchor tendon.

[0009] As a preferred solution, the tower assembly is also provided with heave damping plates at the two bottom corners where it is connected to the buoy, and the plate surface of the heave damping plates is parallel to the bottom surface of the tower assembly. This design optimizes the floating stability of the tower frame. Under the action of surge, the tower assembly heaves up and down on the sea surface, and this heave motion is not conducive to the power generation of the unit. In order to reduce the heave amplitude of the frame, heave damping plates are provided at the two bottom corners of the tower assembly. Through such a plate-shaped design, the resistance of the tower assembly during the heave motion can be increased, and the floating stability of the tower assembly can be effectively improved.

[0010] As a preferred solution, the heave damping plate is in the shape of a triangular plate, the edge of the heave damping plate is fixedly connected to the bottom frame of the tower assembly, and the plate surface of the heave damping plate is provided with evenly distributed through holes to balance the damping size. On the basis of the above-mentioned heave damping plate design, the structure of the heave damping plate is further optimized, the outer shape structure increases the fixing stability between the heave damping plate and the tower assembly, and evenly distributed through holes are provided on the heave damping plate, which increases a certain degree of water permeability, increases the viscosity between the damping plate and the water body, and further improves the stability of the tower assembly.

[0011] As a preferred solution, the cross-sectional outer contour of the side beam connecting the tower assembly and the two pontoon members is spindle-shaped, and the side beam comprises a cylindrical steel core, and a spindle-shaped drag reduction outer shell wrapped around the outer edge of the steel core; the side beam connecting the tower assembly and the mooring assembly comprises a steel core with a cross-shaped cross-section and a circular arc-shaped drag reduction outer shell wrapped around the outer edge of the steel core.

[0012] This design further optimizes the structural design of the tower assembly. In view of the distribution of support points of the frame itself, the two side beams located on the opposite sides of the tower assembly adopt a spindle-shaped outer contour. Such an outer shell shape can reduce the area of ​​the side beams subjected to resistance in seawater, while the use of a circular steel core inside can ensure the force requirements. Similarly, the side beams connecting the mooring components have an arc-shaped side contour surface, and a cross-shaped steel core is used in the center to ensure the stability of the supporting force.

[0013] As a preferred solution, the tower assembly is connected with reinforcing rib groups between its side beams and between the side beams and the bottom frame. And by adding reinforcing rib groups between the frame structures, the material consumption of several main beams can be further reduced, and the structural strength requirements can be met by using thinner frame beams, which can further reduce the overall material consumption.

[0014] As a preferred solution, the mooring barrel shaft includes an inner shaft body and an upper first limit end plate and a second limit end plate which are integrally connected to the two ends of the inner shaft body, the first limit end plate is connected to the end of the anchor tendon, and a rotating bearing connecting the two is arranged between the outer periphery of the inner shaft body and the outer shell of the mooring barrel. This design further optimizes the mooring component, and the structure of the mooring barrel shaft is similar to a winding wheel, with a small diameter in the middle and a cylindrical shape, and limit end plates with larger diameters are arranged at both ends, and limit end plates are arranged at both ends. The structure of the limit end plates can effectively limit the two ends of the mooring barrel outer shell sleeved outside the shaft, keep the axial position between the two stable, and the rotating bearing ensures the stability of the rotational cooperation between the sleeve and the shaft.

[0015] As a preferred solution, the mooring barrel shell includes an integrally connected drum part and an end plate shell part, the drum part is sleeved on the outer periphery of the inner shaft body, the end plate shell part is a hollow disc-shaped shell, the second limit end plate can be rotatably accommodated in the end plate shell part, a rolling bearing is arranged between the plate surface of the second limit end plate and the end plate shell part, and a rolling bearing is also arranged between the end surface of the drum part that abuts against the first limit end plate and the first limit end plate. This design optimizes the structural design of the mooring barrel shell, including the shell part and the end plate shell part that are respectively accommodated and matched with the inner shaft body and the second limit disk, optimizes the matching mode between the mooring barrel shell and the drum shaft, accommodates the limit end plate at one end of the shaft in the mooring barrel shell, prevents the tower and the mooring drum from vertically separating, and adds two sets of rolling bearings on the basis of the structure of the lateral bearing, thereby improving the supporting and lubricating effect of the rotation.

[0016] As a preferred solution, a second generator set is arranged in the hollow interior of the inner shaft body, and the second generator set includes a rotor shaft and a stator sleeve. The rotor shaft is coaxial with the inner shaft body and fixedly connected to the center position of the end plate outer shell, and the stator sleeve is fixedly connected to the inner circumference of the inner shaft body, and generates electricity through the relative rotation between the mooring barrel outer shell and the mooring barrel rotating shaft. This design further generates electricity through the relative rotation between the stator sleeve circumferentially fixed to the inner shaft body and the rotor shaft by arranging the second generator set in the mooring barrel rotating shaft. Through this design, during the rotation of the tower assembly relative to the anchoring position, the relative rotation can be used to drive the second generator set to generate electricity, which can serve as a supplement to the power generation work of the wind turbine assembly connected to the top of the tower assembly.

[0017] As a preferred solution, a wing plate structure is fixedly connected to the mooring barrel shell, and the plate surface of the wing plate structure is parallel to the central axis direction of the mooring barrel shell. By arranging the wing plate structure on the mooring barrel shell, the overall wind stability of the wind turbine can be improved, thereby improving the power generation efficiency of the wind turbine set.

[0018] As a preferred solution, the bottom end surface of the first limit end plate is connected with three anchoring tendons, and the connection points between each anchoring tendon and the limit end plate are distributed in an equilateral triangle. This design provides a preferred connection method between the anchoring tendons and the limit end plate. The anchoring tendons are in an inclined and tensioned state when the wind turbine is operating. It is preferably designed that the three anchoring tendons are designed as equilateral triangles at the seabed mooring point and the hinge point of the limit end plate, which can improve the torsion and tensile resistance of the anchoring tendons. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the overall structure of a tower-free offshore floating wind turbine device capable of self-adapting to wind direction provided by the present invention; Figure 2 for Figure 1A schematic diagram of the structure of a tower assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the side beam rod of the middle tower assembly; Figure 4 for Figure 2 A schematic diagram of a cross-sectional structure of another side beam rod of a mid-tower assembly; Figure 5 for Figure 1 A schematic diagram of a partial cross-sectional structure of a mooring tube shell of a mooring assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 6 for Figure 1 A schematic diagram of the partial internal structure of the upper half of the mooring assembly of the offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 7 for Figure 1 A schematic diagram of the structure of a mooring drum shaft and a rotating bearing of a mooring assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 8 for Figure 1 A schematic diagram of a partial cross-sectional structure of a mooring drum rotating shaft of a mooring assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; in, Figure 1-Figure 8 middle: 1. Wind turbine assembly; 2. Tower assembly; 2-1. Buoy component; 2-2. Mounting plate; 2-3. Side beam rod; 2-4. Reinforcement rib group; 2-5. Heave damping plate; 2-6. Steel core; 2-7. Drag reduction shell; 3. Mooring assembly; 3-1. Anchoring tendons; 3-2. Wing plate structure; 3-3. Mooring barrel shell; 3-3-1. Rotating barrel part; 3-3-2. End plate shell part; 3-4. First limit end plate; 3-5. Second limit end plate; 3-6. Mooring barrel rotating shaft; 3-7. Rotating bearing; 3-8. Inner shaft; 3-9. Rotor shaft; 3-10. Stator sleeve; 3-11. Rolling bearing; 3-12. Annular groove. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0021] Before explaining the working principle of the present invention in detail, the description of the present invention needs to be further explained: In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welding connection between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] refer to Figure 1 , Figure 2 The following embodiments are described, Figure 1 A schematic diagram of the overall structure of a tower-free offshore floating wind turbine device capable of self-adapting to wind direction provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of a tower assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; The present invention provides a tower-free, wind-direction-adaptive offshore floating wind turbine device, comprising a wind turbine assembly 1, a tower assembly 2 and a mooring assembly 3, wherein the tower assembly 2 is a conical frame with an isosceles triangle at the bottom, the wind turbine assembly 1 is connected to the top of the cone of the tower assembly 2, the two bottom corners of the bottom of the tower assembly 2 are connected with buoys 2-1, and the mooring assembly 3 is connected to the top angle of the triangle at the bottom of the tower assembly 2; the mooring assembly 3 comprises a mooring barrel shell 3-3 and a mooring barrel rotating shaft 3-6 that are coaxially sleeved and rotatably connected to each other, the mooring barrel shell 3-3 is fixedly connected to the tower assembly 2, and the first limit plate 3-4 of the mooring barrel rotating shaft is connected with an anchoring tendon 3-1, and the anchoring tendon 3-1 is used for anchoring with the seabed. The preferred design is to set a planar mounting plate 2-2 at the top point of the tower assembly 2, and the mounting plate 2-2 can be conveniently mounted and fixed with the housing of the wind turbine assembly 1.

[0024] The basic structure of this design is different from the floating wind turbine device of the existing floating wind turbine group. It abandons the commonly used design of a single vertical floating tower to support the wind turbine, and adopts a conical frame-shaped tower component 2 to support the wind turbine component 1 located at the top tip. The bottom surface of the conical frame is an isosceles triangle. The mooring component 3 is connected to the vertex of the isosceles triangle, and the buoy components 2-1 are symmetrically arranged at the two symmetrical ends of the isosceles triangle. Due to the distribution of mooring and buoys, the buoy component 2-1 can be stably half-sunk or completely sunk underwater. Through such a pulling at one end and the force-bearing design of the symmetrical floating support on the other side, good frame posture stability can be provided, ensuring the stability and safety of the wind turbine power generation operation. The conical frame adopted in this design uses less material for the wind turbine bracket compared to the traditional floating tower design, and the bracket design is more flexible, which can effectively save design and construction costs.

[0025] A specific structural design of an optimal mooring component 3 is provided. Since the mooring component 3 and the tower component 2 are rotatably connected, it helps to maintain the stability and effectiveness of the wind posture of the tower component 2. In order to achieve this effect, the mooring component 3 adopts an inner and outer rotating sleeve design, and one of the mooring barrel shell 3-3 and the mooring barrel shaft 3-6 that are rotatably connected to each other is connected to the tower component 2, and the other is connected to the anchor tendon 3-1.

[0026] In the technical solution provided in this embodiment, the tower assembly 2 is further provided with heave damping plates 2-5 at the two bottom corners where it is connected to the buoy member 2-1, and the plate surface of the heave damping plates 2-5 is parallel to the bottom surface of the tower assembly 2. This design optimizes the floating stability of the tower frame. Under the action of surge, the tower assembly 2 heaves up and down on the sea surface, and this heave motion is not conducive to the power generation of the unit. In order to reduce the heave amplitude of the frame, the heave damping plates 2-5 are provided at the two bottom corners of the tower assembly 2. Through such a plate-shaped design, the resistance of the tower assembly 2 in the heave motion can be increased, and the floating stability of the tower assembly 2 can be effectively improved.

[0027] In the technical solution provided in this embodiment, the vertical swing damping plate 2-5 is in the shape of a triangular plate, the edge of the vertical swing damping plate 2-5 is fixedly connected to the bottom frame of the tower assembly 2, and the plate surface of the vertical swing damping plate 2-5 is provided with evenly distributed through holes to balance the damping size. On the basis of the above-mentioned design of the vertical swing damping plate 2-5, the structure of the vertical swing damping plate 2-5 is further optimized, the outer shape structure increases the fixing stability between the vertical swing damping plate 2-5 and the tower assembly 2, and evenly through holes are provided on the vertical swing damping plate 2-5, which increases a certain degree of water permeability, increases the viscosity between the damping plate and the water body, and further improves the stability of the tower assembly 2.

[0028] refer to Figure 3 , Figure 4 Let me explain the example. Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the side beam rod of the middle tower assembly; Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of another side beam rod of the mid-tower assembly.

[0029] In the technical solution provided in this embodiment, the cross-sectional outer contour of the side beam rod 2-3 connecting the tower assembly 2 and the two buoy components 2-1 is spindle-shaped, and the side beam rod 2-3 includes a cylindrical steel core 2-6, and a spindle-shaped drag reduction shell 2-7 wrapped around the outer edge of the steel core 2-6; the side beam rod 2-3 connecting the tower assembly 2 and the mooring assembly 3 includes a steel core 2-6 with a cross-shaped cross-section and a circular arc-shaped drag reduction shell 2-7 wrapped around the outer edge of the steel core 2-6.

[0030] This design further optimizes the structural design of the tower assembly 2. In view of the distribution of support points of the frame itself, the two side beams 2-3 located on the opposite sides of the tower assembly 2 adopt a spindle-shaped outer contour. Such an outer shell shape can reduce the area of ​​the side beams 2-3 subjected to resistance in seawater, while the circular steel core 2-6 inside can ensure the force requirements; similarly, the side beams 2-3 connected to the mooring assembly 3 have an arc-shaped side contour surface, and the cross-shaped steel core 2-6 in the center can ensure the stability of the supporting force.

[0031] In the technical solution provided in this embodiment, the tower assembly 2 is connected with reinforcing rib groups 2-4 between its side beams 2-3 and between the side beams 2-3 and the bottom frame. And by adding reinforcing rib groups 2-4 between the frame structures, the material consumption of several main beams can be further reduced, and the structural strength requirements can be met by using thinner frame beams, which can further reduce the overall material consumption.

[0032] refer to Figure 5-Figure 8 The following embodiments are described, Figure 5 for Figure 1 A schematic diagram of a partial cross-sectional structure of the upper half of a mooring assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 6 for Figure 1 A schematic diagram of the partial internal structure of the upper half of the mooring assembly of the offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 7 for Figure 1 A schematic diagram of the structure of a mooring drum shaft and a rotating bearing of a mooring assembly of an offshore floating wind turbine device without a tower and capable of self-adapting to wind direction; Figure 8 for Figure 1 A schematic diagram of the partial cross-sectional structure of a mooring barrel rotating shaft of a mooring assembly of an offshore floating wind turbine device without a tower and capable of adaptively adjusting wind direction.

[0033] In the technical solution provided in this embodiment, the mooring barrel shaft 3-6 includes an inner shaft body 3-8 and an upper first limiting end plate 3-4 and a second limiting end plate 3-5 which are integrally connected to the two ends of the inner shaft body 3-8, the first limiting end plate 3-4 is connected to the end of the anchoring tendon 3-1, and a rotating bearing 3-7 connecting the two is arranged between the outer periphery of the inner shaft body 3-8 and the mooring barrel shell 3-3. This design further optimizes the mooring component 3, the structure of the mooring barrel shaft 3-6 is similar to a winding wheel, the middle part has a small diameter and is cylindrical, and limiting end plates with larger diameters are arranged at both ends, and limiting end plates are arranged at both ends. The structure of the limiting end plates can effectively limit the two ends of the mooring barrel shell 3-3 sleeved outside the shaft, and keep the axial position between the two stable, and the rotating bearing 3-7 ensures the stability of the rotational cooperation between the sleeve and the shaft.

[0034] In the technical solution provided in this embodiment, the mooring barrel shell 3-3 includes a rotating barrel portion 3-3-1 and an end plate shell portion 3-3-2 that are integrally connected, the rotating barrel portion 3-3-1 is sleeved on the outer periphery of the inner shaft body 3-8, the end plate shell portion 3-3-2 is a hollow disc-shaped shell, the second limiting end plate 3-5 can be rotatably accommodated in the end plate shell portion 3-3-2, a rolling bearing is arranged between the plate surface of the second limiting end plate 3-5 and the end plate shell portion 3-3-2, and a rolling bearing is also arranged between the end surface of the rotating barrel portion 3-3-1 that abuts against the first limiting end plate 3-4 and the first limiting end plate 3-4.

[0035] The design optimizes the structural design of the mooring barrel shell 3-3, including the shell part and the end plate shell part 3-3-2 that are respectively accommodated with the inner shaft body 3-8 and the second limit plate, optimizes the matching mode between the mooring barrel shell 3-3 and the rotating drum shaft, and accommodates the limit end plate located at one end of the shaft in the mooring barrel shell 3-3. Such a shell structure can effectively protect the structure inside the shaft from water ingress, and two sets of rolling bearings are added on the basis of the structure of the lateral bearing, thereby improving the supporting lubrication effect of the rotation. In order to adapt to the installation of rolling bearings, the preferred design is to set a circular ring-mounted ball installation groove on the plate surface of the second limit end plate, and set a circular ring groove 3-12 on the first limit end plate near the base of the inner shaft body, and place the ball between the circular ring groove and the end face of the rotating drum part. Preferably, a circular ring groove is also set on the end face of the rotating drum part to form a complete ball accommodating space.

[0036] In the technical solution provided in this embodiment, the inner shaft body 3-8 is hollow inside and a second generator set is arranged. The second generator set includes a rotor shaft 3-9 and a stator sleeve 3-10. The rotor shaft 3-9 is coaxial with the inner shaft body 3-8 and is fixedly connected to the center position of the end plate shell 3-3-2. The stator sleeve 3-10 is fixedly connected to the inner circumference of the inner shaft body 3-8, and generates electricity through relative rotation between the mooring barrel shell 3-3 and the mooring barrel shaft 3-6. This design further generates electricity through relative rotation between the stator sleeve 3-10 circumferentially fixed to the inner shaft body 3-8 and the rotor shaft 3-9. In the process of the tower assembly 2 rotating relative to the anchoring position, the relative rotation can be used to drive the second generator set to generate electricity, which can be used as a supplement to the power generation work of the wind turbine assembly 1 connected to the top of the tower assembly 2.

[0037] In the technical solution provided in this embodiment, a wing plate structure 3-2 is fixedly connected to the mooring barrel shell 3-3, and the plate surface of the wing plate structure 3-2 is parallel to the central axis direction of the mooring barrel shell 3-3. By arranging the wing plate structure 3-2 on the mooring barrel shell 3-3, the overall wind turbine stability can be improved, thereby improving the power generation efficiency of the wind turbine set.

[0038] In the technical solution provided in this embodiment, the bottom end surface of the first limiting end plate 3-4 is connected with three anchoring tendons 3-1, and the connection points between each anchoring tendon 3-1 and the limiting end plate are distributed in an equilateral triangle. This design provides a preferred connection method between the anchoring tendons 3-1 and the limiting end plate. The anchoring tendons 3-1 are in an inclined and tensioned state when the wind turbine is operating. It is preferably designed that the hinge points of the three anchoring tendons 3-1 at the seabed mooring point and the limiting end plate are all designed as equilateral triangles, which can improve the torsion and tensile resistance of the anchoring tendons 3-1.

[0039] Although the disclosure is disclosed as above, the protection scope of the disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the protection scope of the present invention.

Claims

1. A tower-free offshore floating wind turbine device with self-adaptive wind direction, characterized in that: The invention comprises a wind turbine assembly (1), a tower assembly (2) and a mooring assembly (3); the tower assembly (2) is a conical frame with an isosceles triangle at the bottom; the wind turbine assembly (1) is connected to the top point of the cone of the tower assembly (2); both bottom corners of the bottom of the tower assembly (2) are connected to buoy components (2-1); the mooring assembly (3) is connected to the top corner of the triangle at the bottom of the tower assembly (2); the mooring assembly (3) comprises a mooring barrel shell (3-3) and a mooring barrel rotating shaft (3-6) which are coaxially sleeved and rotatably connected to each other; the mooring barrel shell (3-3) is fixedly connected to the tower assembly (2); the mooring barrel rotating shaft (3-6) is connected to an anchoring tendon (3-1); the anchoring tendon (3-1) is used for anchoring to the seabed.

2. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 1 is characterized in that: The tower assembly (2) is also provided with heave damping plates (2-5) at two bottom corner positions where it is connected to the buoy member (2-1); the plate surface of the heave damping plate (2-5) is parallel to the bottom surface of the tower assembly (2).

3. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 3 is characterized in that: The heave damping plate (2-5) is in the shape of a triangular plate, the edge of the heave damping plate (2-5) is fixedly connected to the bottom surface frame of the tower assembly (2), and the plate surface of the heave damping plate (2-5) is provided with evenly distributed through holes to balance the damping size.

4. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 2 is characterized in that: The cross-sectional outer contour of the side beam rod (2-3) connecting the tower assembly (2) and the two buoy components (2-1) is spindle-shaped, and the side beam rod (2-3) comprises a cylindrical steel core (2-6) and a spindle-shaped drag reduction outer shell (2-7) wrapped around the outer edge of the steel core (2-6); the side beam rod (2-3) connecting the tower assembly (2) and the mooring assembly (3) comprises a steel core (2-6) with a cross-sectional outer contour and a circular arc-shaped drag reduction outer shell (2-7) wrapped around the outer edge of the steel core (2-6).

5. The tower-free wind-direction adaptive offshore floating wind turbine device according to claim 4 is characterized in that: The tower assembly (2) is connected with a reinforcement rib group (2-4) between the side beams (2-3) and between the side beams (2-3) and the bottom surface frame.

6. The tower-free wind direction adaptive offshore floating wind turbine device according to any one of claims 1 to 5, characterized in that: The mooring barrel rotating shaft (3-6) comprises an inner shaft body (3-8) and an upper first limiting end plate (3-4) and a second limiting end plate (3-5) which are integrally connected to the two ends of the inner shaft body (3-8), respectively; the first limiting end plate (3-4) is connected to the end of the anchoring tendon (3-1); and a rotating bearing (3-7) connecting the outer periphery of the inner shaft body (3-8) and the outer shell (3-3) of the mooring barrel is provided between the two.

7. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 6 is characterized in that: The mooring barrel shell (3-3) comprises a rotating barrel portion (3-3-1) and an end plate shell portion (3-3-2) which are integrally connected, the rotating barrel portion (3-3-1) being sleeved on the outer periphery of the inner shaft body (3-8), the end plate shell portion (3-3-2) being a hollow disc-shaped shell, the second limiting end plate (3-5) being rotatably accommodated in the end plate shell portion (3-3-2), a rolling bearing being arranged between the plate surface of the second limiting end plate (3-5) and the end plate shell portion (3-3-2), and a rolling bearing being also arranged between the end surface of the rotating barrel portion (3-3-1) which abuts against the first limiting end plate (3-4) and the first limiting end plate (3-4).

8. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 7 is characterized in that: A second generator set is hollowly arranged inside the inner shaft body (3-8), and the second generator set comprises a rotor shaft (3-9) and a stator sleeve (3-10); the rotor shaft (3-9) is coaxial with the inner shaft body (3-8) and is fixedly connected to the center position of the end plate outer shell (3-3-2); the stator sleeve (3-10) is fixedly connected to the inner circumference of the inner shaft body (3-8), and generates electricity through relative rotation between the mooring barrel outer shell (3-3) and the mooring barrel rotating shaft (3-6).

9. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 7, characterized in that: A wing plate structure (3-2) is fixedly connected to the mooring barrel shell (3-3), and a plate surface of the wing plate structure (3-2) is parallel to the central axis direction of the mooring barrel shell (3-3).

10. The tower-free wind direction adaptive offshore floating wind turbine device according to claim 6, characterized in that: The bottom end surface of the first limiting end plate (3-4) is connected to three anchoring tendons (3-1), and the connection points between the anchoring tendons (3-1) and the limiting end plate (3-4) are distributed in an equilateral triangle.

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