Economical rotatable single-point mooring device

Abstract

The invention relates to the technical field of marine new energy, and discloses an economical rotatable single-point mooring device which comprises a strong anchor chain and a common short chain which are located at the bottom of a floating type fan, the strong anchor chain is connected with the common short chain through a chain separator base, and the two ends of the strong anchor chain are connected with the chain separator base through rotating rings and the floating type fan respectively. The chain divider base is connected with a common short chain through a chain divider, and a shackle is arranged in the middle of the common short chain, so that the floating type fan can freely rotate along the central axis of the upper rotating ring and the central axis of the lower rotating ring, the floating type fan can rotate to the direction with the minimum environmental load according to the wind vane effect, the anchoring load is reduced, and the anchoring cost is reduced; the device is simple in structure and manufacturing, low in cost, capable of improving anchoring efficiency, easy to manufacture, transport and install, and has economic potential of standardized batch production.

Description

Technical Field

[0001] The invention relates to the field of marine new energy technology, in particular to an economical rotatable single-point mooring device. Background Art

[0002] With the continuous advancement of marine energy development, floating wind turbines are increasingly used in the field of offshore wind power. However, the existing floating wind turbine mooring technology is to arrange 2 to 3 mooring chains on each column for anchoring. This causes the environmental load on the platform to change when the environmental conditions change. Therefore, when designing the anchor chain, it is necessary to select the working condition with the largest environmental force as the design condition, resulting in excessive redundancy of all anchor chains, resulting in excessively high mooring costs, thus limiting the large-scale application and development of floating wind turbines. The traditional single-point mooring device has problems such as complex structure, high cost, and difficult maintenance. In addition, the traditional single-point mooring device is huge in size and difficult to arrange.

[0003] In the document CN 117864310 A, a single-point mooring device for a floating wind power platform is disclosed, including a cylindrical mooring tube, a center hole is opened in the middle of the mooring tube, a fixed ring is fixed on the top end face of the mooring tube, a rotating ring is rotatably installed on the top of the fixed ring through a connecting pin, so that the rotating ring can rotate relative to the fixed ring, the outer circumference of the rotating ring is connected to a soft rigid arm through a first connector, and the soft rigid arm is used to connect to the floating wind power platform; the bottom of the fixed ring is connected to the mooring cable through a second connector, and the end of the mooring cable is fixed to the seabed through the center hole. In this structure, the mooring cable passes through the center hole in the middle of the mooring tube and is connected to the fixed ring, and multiple mooring cables are passed through the mooring cable. In the seabed with more complex working conditions, the mooring cable is prone to knotting due to the small center hole.

[0004] Therefore, a new technical solution is needed to solve the above technical problems. Summary of the invention

[0005] In order to solve the above problems, the present invention discloses an economical rotatable single-point mooring device, which enables a floating wind turbine to rotate freely along the central axis of an upper swivel and a lower swivel, thereby rotating the floating wind turbine to a direction with the minimum environmental load according to a weather vane effect, thereby reducing the mooring load and the mooring cost.

[0006] The technical solution of the present invention is: an economical rotatable single-point mooring device, comprising a strong anchor chain and an ordinary short chain located at the bottom of a floating wind turbine, the strong anchor chain is connected to the ordinary short chain through a chain splitter base, both ends of the strong anchor chain are connected to the floating wind turbine and the chain splitter base through a swivel, the chain splitter base is connected to the ordinary short chain through the chain splitter, and a shackle is provided in the middle of the ordinary short chain.

[0007] By adopting the above technical solution, the floating wind turbine can rotate freely along the central axis of the upper swivel and the lower swivel, so that the floating wind turbine can rotate to the direction with the minimum environmental load according to the wind vane effect, thereby reducing the mooring load and the mooring cost.

[0008] Preferably, the swivel includes a connecting part and a rotating part connected to the strong anchor chain. The connecting part includes a connecting ring and a base fixedly connected to the connecting ring. The connecting ring is connected to the strong anchor chain. The rotating part includes a ring part and a limiting part. The limiting part is integrally T-shaped. The upper end of the limiting part penetrates through the base, and the lower end is connected to the ring part.

[0009] By adopting the above technical solution, the strong anchor chain is connected to the connecting ring and rotates around the limiting part through the base, preventing the strong anchor chain from generating torque.

[0010] Preferably, the position where the ring part of the swivel is connected to the floating wind turbine through the upper swivel base is the upper swivel, and the position where the ring part of the swivel is connected to the chain splitter through the chain splitter base is the lower swivel.

[0011] By adopting the above technical solution, the upper swivel and the lower swivel can rotate freely around the central axis of the swivel respectively, ensuring that the strong anchor chain does not generate torque axially.

[0012] Preferably, the upper swivel base is located at the center of the bottom circle of the floating wind turbine, and lifting lugs are evenly arranged circumferentially on the lower part of the circumferential side of the floating wind turbine.

[0013] By adopting the above technical solution, during the migration condition, that is, when the anchor chain is in the storage position, the end of the ordinary short chain is connected to a shackle, and the end shackle is connected to the lifting lug on the side wall of the floating wind turbine, which is convenient for storage and transportation.

[0014] Preferably, the chain splitter is in the shape of a frustum of a cone with a large upper part and a small lower part. The chain splitter base is located at the center of the chain splitter, and stiffening plates perpendicular to both the chain splitter base and the upper part of the floating wind turbine are provided on both sides in the length direction of the chain splitter base.

[0015] By adopting the above technical solution, the stiffening plates on both sides of the chain splitter base can increase the connection strength between the chain splitter base and the upper part of the chain splitter, and increase the service life.

[0016] Preferably, chain splitter anchor chain holes are provided on the peripheral edge of the upper part of the chain splitter, and anchor chain hole stiffening ribs are also provided between the periphery of the chain splitter anchor chain holes and the chain splitter. The ordinary short chain is connected to the anchor chain hole stiffening ribs outside the chain splitter anchor chain holes.

[0017] By adopting the above technical solution, the anchor chain hole stiffening ribs surround the upper circumference of the chain splitter, and the ordinary short chain is connected to the chain splitter through the anchor chain hole stiffening ribs as connection points, improving the connection strength between the ordinary short chain and the chain splitter.

[0018] Preferably, the chain divider's anchor chain holes are evenly divided into 2 - 4 groups, with each group being equipped with 2 - 4 ordinary short chains, and the included angle between the ordinary short chains within each group is 5 - 30 degrees.

[0019] By adopting the above technical solution, the number and included angle of the ordinary short chains on the chain divider can be set according to actual needs to adapt to different sea area conditions.

[0020] Preferably, the end of the ordinary short chain is connected to a pre - cast anchor chain or a wire rope through a shackle. The shackle is in an overall Ω shape and includes a U - plate and a bolt - nut.

[0021] Preferably, the end of the ordinary short chain is connected to the bottom of the U - plate. The pre - cast anchor chain or the wire rope is located between the openings of the U - plate. The bolt - nut passes through the opening of the U - plate and the pre - cast anchor chain or the wire rope for connection. The pre - cast anchor chain or the wire rope is rotatably connected between the bolts. The lug is located at the opening of the U - plate and is fastened by the bolt - nut.

[0022] By adopting the above technical solution, according to the working conditions, when in the migration condition, the pre - cast anchor chain or the wire rope is detached from the ordinary short chain through the shackle, and then the shackle is connected to the lug around the floating wind turbine, which is convenient for storage and transportation. When in the working state, the shackle at the end of the ordinary short chain is unfastened from the lug and then connected to the pre - cast anchor chain or the wire rope. The operation is simple and convenient, and the cost is low.

[0023] Preferably, the strength of the ordinary short chain is the same as that of the pre - cast anchor or the wire rope, and the strength of the ordinary short chain is less than one - half of that of the strong anchor chain.

[0024] By adopting the above technical solution, it is ensured that the strong anchor chain cannot break under any circumstances.

[0025] The advantages of the present invention are as follows: 1. The upper swivel provided in the present invention can rotate freely along the axial direction of the swivel, ensuring that when the floating wind turbine is subjected to environmental loads, it can automatically rotate to the direction with the minimum load according to the wind vane effect, thereby reducing the mooring load of the anchor chain and further reducing the mooring cost.

[0026] 2. The lower swivel provided in the present invention can rotate freely along the axial direction of the swivel, ensuring that the torque generated by the rotation of the floating wind turbine will not be transmitted to the chain divider, thereby ensuring that the anchor chain below the chain divider will not be twisted and improving the mooring efficiency.

[0027] 3. The end shackle provided in the present invention can be directly connected to the pre-laid anchor chain or wire rope, improving the installation efficiency of the floating wind turbine. According to the working conditions, when in the migration condition, the pre-laid anchor chain or wire rope is detached from the ordinary short chain through the shackle, and then the shackle is connected to the lifting lugs around the floating wind turbine, which is convenient for storage and transportation. When in the working state, the shackle at the end of the ordinary short chain is unfastened from the lifting lug and then connected to the pre-laid anchor chain or wire rope. The operation is simple and convenient, and the cost is low.

[0028] 4. The structure of the present invention is simple to manufacture and has a low cost. At the same time, it can improve the mooring efficiency, is easy to manufacture, transport and install, and has the economic potential for standardized batch production. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the present invention in the use state; Figure 3 is a schematic structural diagram of the swivel of the present invention; Figure 4 is a schematic structural diagram of the chain splitter of the present invention.

[0030] Wherein: 1. Floating wind turbine; 2. Upper swivel base; 3. Upper swivel; 31. Connecting part, 311. Connecting ring; 312. Base; 32. Rotating part; 321. Ring part; 322. Limiting part; 4. Strong anchor chain; 5. Lower swivel; 6. Chain splitter base; 601. Stiffening plate; 7. Chain splitter; 8. Ordinary short chain; 9. Shackle; 901. U plate; 10. Lifting lug; 12. Chain splitter anchor chain hole; 13. Anchor chain hole reinforcing rib; 14. Pre-laid anchor chain or wire rope. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] As Figures 1-4 shown, an economically rotatable single-point mooring device includes a strong anchor chain 4 and an ordinary short chain 8 at the bottom of a floating wind turbine 1. The strong anchor chain 4 is connected to the ordinary short chain 8 through a chain splitter base 6. Both ends of the strong anchor chain 4 are connected to the chain splitter base 6 through swivels and the floating wind turbine 1 respectively. The chain splitter base 6 is connected to an ordinary short chain 8 through a chain splitter 7. A shackle 9 is provided in the middle of the ordinary short chain 8, enabling the floating wind turbine 1 to freely rotate along the central axis of the upper swivel 3 and the lower swivel 5, so that the floating wind turbine 1 can be rotated to the direction with the minimum environmental load according to the wind vane effect, thereby reducing the mooring load and the mooring cost.

[0033] The swivel includes a connecting part 31 and a rotating part 32 connected to the strong anchor chain 4. The connecting part 31 includes a connecting ring 311 and a base 312 fixedly connected to the connecting ring 311. The connecting ring 311 is connected to the strong anchor chain 4. The rotating part 32 includes a ring part 321 and a limiting part 322. The limiting part 322 is integrally T-shaped. The upper end of the limiting part 322 penetrates through the base 312, and the lower end is connected to the ring part 321. The strong anchor chain 4 is connected to the connecting ring 311 and rotates around the limiting part 322 through the base 312, preventing the strong anchor chain 4 from generating torque.

[0034] The position where the ring part 321 of the swivel is connected to the floating wind turbine 1 through the upper swivel base 2 is the upper swivel 3. The position where the ring part of the swivel is connected to the chain separator 7 through the chain separator base 6 is the lower swivel 5. The upper swivel 3 and the lower swivel 5 can rotate freely around the central axis of the swivel, ensuring that the strong anchor chain 4 does not generate torque axially.

[0035] The upper swivel base 2 is located at the center of the bottom circle of the floating wind turbine 1. The lower part of the circumferential side of the floating wind turbine 1 is evenly provided with lifting lugs 10 in the circumferential direction. During the migration condition, that is, when the anchor chain is in the storage position, the end of the ordinary short chain 8 is connected to the shackle 9, and the end shackle 9 is connected to the lifting lug 10 on the side wall of the floating wind turbine 1, which is convenient for storage and transportation.

[0036] The chain separator 7 is in the shape of a frustum with a large upper part and a small lower part. The chain separator base 6 is located at the center of the chain separator 7. On both sides of the length direction of the chain separator base 6, there are stiffening plates 601 that are perpendicular to both the chain separator base 6 and the upper part of the floating wind turbine 1 at the same time. The stiffening plates 601 on both sides of the chain separator base 6 can increase the connection strength between the chain separator base 6 and the upper part of the chain separator 7 and increase the service life.

[0037] The upper circumferential edge of the chain separator 7 is provided with chain separator anchor chain holes 12. Between the periphery of the chain separator anchor chain holes 12 and the chain separator 7, there are also anchor chain hole reinforcing ribs 13. The ordinary short chain 8 is connected to the anchor chain hole reinforcing ribs 13 outside the chain separator anchor chain holes 12. The anchor chain hole reinforcing ribs 13 surround the upper circumference of the chain separator 7. The ordinary short chain 8 is connected to the chain separator 7 through the anchor chain hole reinforcing ribs 13 as the connection points, improving the connection strength between the ordinary short chain 8 and the chain separator 7.

[0038] The chain separator anchor chain holes 12 are evenly divided into 2 - 4 groups, and each group is equipped with 2 - 4 ordinary short chains 8. The included angle between the ordinary short chains 8 within each group is 5 - 30 degrees. The number and included angle of the ordinary short chains 8 on the chain separator 7 can be set according to actual needs to adapt to different sea area conditions.

[0039] The end of the ordinary short chain 8 is connected with a precast anchor chain or a wire rope 14 through a shackle 9. The shackle 9 is integrally in an Ω shape and includes a U-shaped plate 901 and a bolt and nut 902. The end of the ordinary short chain 8 is connected to the bottom of the U-shaped plate 901. The precast anchor chain or the wire rope 14 is located at the position between the openings of the U-shaped plate 901. The bolt and nut pass through the opening of the U-shaped plate 901 and the precast anchor chain or the wire rope 14 for connection. The precast anchor chain or the wire rope 14 is rotatably connected between the bolts. The lifting lug 10 is located at the opening of the U-shaped plate 901 and is fastened by a bolt and nut. According to the working conditions, when in the migration working condition, the precast anchor chain or the wire rope 14 is detached from the ordinary short chain 8 through the shackle 9, and then the shackle 9 is connected to the lifting lug around the floating wind turbine 1, which is convenient for storage and transportation. When in the working state, the shackle at the end of the ordinary short chain is unfastened from the lifting lug 10 and then connected to the precast anchor chain or the wire rope. The operation is simple and convenient, and the cost is low. Figure 2 When the device is not in use, the strong anchor chain 4 is installed on the lifting lug 10 through the shackle 9.

[0040] The strength of the ordinary short chain 8 is the same as that of the precast anchor or the wire rope 14, and the strength of the ordinary short chain 8 is less than half of that of the strong anchor chain 4, ensuring that the strong anchor chain 4 cannot break under any circumstances.

[0041] When the floating wind turbine 1 is subjected to environmental loads, the floating wind turbine 1 can freely rotate around the central axis of the upper swivel ring according to the environmental loads, ensuring that the environmental loads received by the strong anchor chain 4 are minimized. At the same time, the strong anchor chain 4 can also freely rotate around the central axis of the lower swivel ring 5, ensuring that the strong anchor chain 4 is not subjected to torque in the axial direction. At the same time, after the lower swivel ring 5 rotates freely, the chain separator 7 is not subjected to axial torque on the horizontal plane, so that the ordinary short chain 8 on the chain separator 7 is not subjected to torque in the axial direction of the chain separator 7, improving the mooring efficiency of each ordinary short chain 8 and reducing the mooring cost of the entire wind turbine platform.

[0042] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been completely and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments. Without departing from the said principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. An economically rotatable single-point mooring device, comprising a strong anchor chain and a common short chain located at the bottom of a floating wind turbine, wherein the strong anchor chain is connected to the common short chain through a chain splitter base, and is characterized in that: Both ends of the strong anchor chain are respectively connected to the sub-chain separator base through swivels and floating wind turbines. The sub-chain separator base is connected to a common short chain through a chain separator. A shackle is provided in the middle of the common short chain.

2. The economic rotatable single point mooring device according to claim 1, characterized in that: The swivel includes a connecting part and a rotating part connected to the strong anchor chain. The connecting part includes a connecting ring and a base fixedly connected to the connecting ring. The connecting ring is connected to the strong anchor chain. The rotating part includes a ring part and a limiting part. The limiting part is generally T-shaped. The upper end of the limiting part penetrates through the base, and the lower end is connected to the ring part.

3. The economic rotatable single point mooring device according to claim 2, characterized in that: The position where the ring part of the swivel is connected to the floating wind turbine through the upper swivel base is the upper swivel. The position where the ring part of the swivel is connected to the chain separator through the sub-chain separator base is the lower swivel.

4. An economical rotatable single point mooring device according to claim 3, characterized in that: The upper swivel base is located at the center of the bottom of the floating wind turbine. Lifting lugs are evenly arranged circumferentially on the lower part of the circumferential side of the floating wind turbine.

5. An economical rotatable single point mooring device according to claim 4, characterized in that: The chain separator is in the shape of a frustum of a cone with a larger upper part and a smaller lower part. The sub-chain separator base is located at the center of the chain separator. Stiffening plates perpendicular to both the sub-chain separator base and the upper part of the floating wind turbine are provided on both sides in the length direction of the sub-chain separator base.

6. An economically rotatable single point mooring device according to claim 5, characterized in that: Chain separator anchor chain holes are provided at the outer edge of the upper part of the chain separator. Anchor chain hole reinforcing ribs are also provided between the periphery of the chain separator anchor chain holes and the chain separator. The common short chain is connected to the anchor chain hole reinforcing ribs outside the chain separator anchor chain holes.

7. An economically rotatable single point mooring device according to claim 6, characterized in that: The chain separator anchor chain holes are evenly divided into 2 - 4 groups. Each group is equipped with 2 - 4 common short chains. The included angle between the common short chains in each group is 5 - 30 degrees.

8. An economically rotatable single point mooring device according to claim 7, characterized in that: The end of the common short chain is connected to a precast anchor chain or a wire rope through a shackle. The shackle is generally Ω-shaped. The shackle includes a U-plate and a bolt and nut.

9. An economical rotatable single point mooring device according to claim 8, characterized in that: The end of the common short chain is connected to the bottom of the U-plate. The precast anchor chain or the wire rope is located between the openings of the U-plate. The bolt and nut pass through the opening of the U-plate and the precast anchor chain or the wire rope for connection. The precast anchor chain or the wire rope is rotatably connected between the bolts. The lifting lug is located at the opening of the U-plate and is fastened by a bolt and nut.

10. An economical rotatable single-point mooring device according to claim 1, characterized in that: The strength of the common short chain is the same as that of the precast anchor or the wire rope. The strength of the common short chain is less than one-half of the strong anchor chain.

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