Mooring damping device suitable for offshore floating type structure

Abstract

The invention provides a mooring damping device suitable for an offshore floating type structure, and relates to the technical field of offshore floating type photovoltaic power generation, and the mooring damping device comprises a cylindrical cavity structure, a hollow cylindrical foam floating body, a water baffle, a pull rod, a pulley, a stainless steel weight, a pulley bracket, a steel wire rope, a one-way check water inlet valve and a water outlet. A one-way non-return water inlet valve and a water outlet are arranged on the surface of a cavity of the cylindrical cavity structure, and a circular water baffle, a pull rod and a steel wire rope are arranged in the cylindrical cavity structure. The hollow cylindrical foam floating body is nested on the surface of the cavity structure, and the pulley bracket and the pulley are arranged on the top surface of the cavity structure. The steel wire rope bypasses the pulley, one end of the steel wire rope penetrates through the cylindrical cavity structure to be connected with the water baffle, and the other end of the steel wire rope is connected with the stainless steel weight to form a set of transmission system, so that the water baffle can move back and forth in the cavity structure to form water damping. Therefore, external energy can be effectively buffered, and the mooring force borne by the whole mooring system is remarkably reduced.

Description

Technical Field

[0001] The invention relates to the technical field of offshore floating photovoltaic power generation, and is a damping device which can effectively reduce the mooring force of a large floating structure. Background Art

[0002] As the global demand for clean energy and marine resources continues to grow, the development of offshore floating energy facilities has received increasing attention. At the same time, the mooring system is of vital importance to floating photovoltaics. The mooring system uses cables, anchor chains and other connecting tools to fix the floating photovoltaic device in the water to prevent it from drifting or capsizing due to external forces such as wind and waves. This fixing effect ensures that the photovoltaic system can operate stably and avoids the reduction of power generation efficiency or equipment damage caused by position changes.

[0003] Traditional mooring systems often use rigid connections, which are prone to generate large mooring forces when facing external loads, and are more likely to reach their load-bearing limits, thereby increasing the risk of breakage. In addition, their shock absorption performance is poor. When dealing with complex sea conditions such as waves, tides and currents, they cannot effectively absorb and alleviate vibrations and shocks, which may cause mooring structures (such as buoys, platforms, etc.) to bear greater dynamic loads and accelerate their fatigue damage.

[0004] Based on this, the present invention proposes a mooring damping device suitable for offshore floating structures, which can buffer large mooring forces and vibrations, thereby reducing the impact of severe sea conditions on floating structural facilities and ensuring the stable operation of offshore power generation structures. Summary of the invention

[0005] The present invention proposes a mooring damping device suitable for an offshore floating structure. The damping device is composed of a cylindrical cavity structure with a water inlet valve and a water outlet, a hollow cylindrical foam float, a water baffle, a pull rod, a stainless steel weight (or counterweight), a steel wire rope, a pulley and a pulley bracket. The hollow cylindrical foam float is nested on the surface of the cylindrical cavity structure so that the entire damping device floats on the water surface. The circular water baffle is arranged in the cylindrical cavity structure and connected to the pull rod passing through the bottom surface of the cylindrical cavity structure. The pulley bracket together with the pulley is arranged on the top surface of the cylindrical cavity structure. The steel wire rope passes around the pulley, one end of which passes through the cylindrical cavity structure and is connected to the water baffle, and the other end is connected to the stainless steel weight (or counterweight) to form a transmission system, so that the water baffle can move back and forth in the cylindrical cavity structure. The water inlet valve on the cylindrical cavity structure is arranged as a one-way check valve, and a water outlet is arranged opposite to the one-way check water inlet valve. A perforated cover is provided on the top surface of the cylindrical cavity structure, and six small holes are arranged on the perforated cover, which allows the steel cable to pass through the cylindrical cavity structure and connect to the water retaining plate, and prevents vacuum from being generated in part of the cavity on the water retaining plate, so as to prevent the water retaining plate from being unable to return to its initial position under the gravity of the stainless steel weight. The length of the steel cable and the pulley bracket is controlled to prevent the stainless steel weight connected by the steel cable from colliding with the cylindrical cavity structure and the hollow cylindrical foam float due to the influence of waves and currents at sea, causing irreversible damage to the damping device.

[0006] Finally, the pull rod passing through the bottom surface of the cylindrical cavity structure is connected to the anchor chain in the mooring system. Further, the pulley is connected to a rib plate, and the rib plate is connected to the floating power generation structure, so that the entire damping device is connected to the floating power generation structure.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] The core of the device lies in its unique cavity structure and movable water baffle design. When the offshore floating structure is affected by external factors such as wind, waves, and tides, it will produce violent shaking and mooring forces. At this time, the water baffle will move in the cavity, squeezing the water inside. This squeezing will produce a damping force opposite to the external force, thereby effectively absorbing the external impact energy and reducing the direct impact on the mooring system. This design not only significantly reduces the burden on the mooring system, but also greatly extends the service life of the mooring system.

[0009] In addition, the water damping device also has excellent durability during long-term use. Since it mainly generates damping force through the squeezing of water, it avoids the wear and fatigue problems caused by long-term stretching and compression of traditional spring cables, reducing the use cost and operation and maintenance cost.

[0010] From the perspective of environmental protection and sustainability, water damping devices also have significant advantages. It does not require additional energy to produce the damping effect, and relies entirely on natural physical principles. Therefore, in the process of promoting the development and application of clean energy, this device is a greener and more sustainable choice. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A mooring damping device suitable for an offshore floating structure - front view of the damping device;

[0012] Figure 2 A mooring damping device suitable for an offshore floating structure - front cross-sectional view of the damping device;

[0013] Figure 3 A mooring damping device suitable for use on offshore floating structures - top view of the damping device;

[0014] Figure 4 Front view of a one-way check valve, a mooring damping device suitable for offshore floating structures;

[0015] Figure 5 A mooring damping device suitable for offshore floating structures - front view of a cylindrical cavity structure with a hole cover;

[0016] In the figure, 1, cylindrical cavity structure; 2, hollow cylindrical foam float; 3, water retaining plate; 4, pull rod; 5, pulley; 6, stainless steel weight; 7, pulley bracket; 8, wire cable; 9, one-way check water inlet valve; 10, water outlet; 11, cover with holes. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the implementation of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without making creative work all fall within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of 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.

[0020] See attached Figure 1-2 , which is a mooring damping device suitable for offshore floating structures proposed by the present invention. The damping device consists of a cylindrical cavity structure 1, a hollow cylindrical foam float 2, a water baffle 3, a pull rod 4, a pulley 5, a stainless steel weight 6, a pulley bracket 7, a steel cable 8, a one-way check water inlet valve 9, a water outlet 10, and a cover with holes 11. The cylindrical cavity structure 1 serves as the main frame of the damping device, and a circular water baffle 3 and a pull rod 4 and a steel cable 8 connecting the water baffle 3 are arranged inside. Referring to the attached figure, 4, in order to ensure that an appropriate amount of water is always maintained inside the cavity of the cylindrical cavity structure 1, a one-way check water inlet valve 9 is installed on the lower surface of the cylindrical cavity structure 1. This valve only allows seawater to flow in one way, effectively preventing the water from being lost when it is not needed, and ensuring that the damping device can perform at its best performance at any time. On the upper surface of the cylindrical cavity structure 1, a water outlet 10 is opened, see the attached Figure 3 , and its pore size directly affects the water damping effect of the entire damping device, and is one of the important parameters for adjusting the damping performance. A hollow cylindrical foam float 2 is nested outside the cylindrical cavity structure 1. This hollow cylindrical foam float 2 is made of a lightweight and durable polystyrene foam material, which can not only provide sufficient buoyancy so that the entire damping device can float stably on the water surface, but also resist the erosion of seawater to a certain extent, thereby extending the service life of the device. Of course, the material of the hollow cylindrical foam float 2 of the present invention is not limited to polystyrene foam, and the present invention does not limit any other material with sufficient buoyancy that can achieve the purpose of the present invention.

[0021] In order to realize the reciprocating movement of the water retaining plate 3, the damping device is equipped with a transmission system consisting of a steel cable 8, a pulley 5 and a pulley bracket 7. The pulley bracket 7 is installed on the top surface of the cylindrical cavity structure 1. One end of the steel cable 8 passes through the cylindrical cavity structure 1 and is connected to the water retaining plate 3, and the other end passes around the pulley 5 and is connected to a stainless steel weight 6 with a certain weight. A hole cover 11 is provided on the top surface of the cylindrical cavity structure 1, see the attached Figure 5Six small holes are evenly arranged on the perforated cover 11 to prevent the upper cavity of the water retaining plate 3 from generating a vacuum, so as to avoid the water retaining plate 3 being restricted in movement in the cylindrical cavity structure 1 and unable to return to the initial position. In the present invention, the length of the pulley bracket 7 and the steel cable 8 can be controlled according to specific needs to prevent the stainless steel weight 6 from colliding with the cylindrical cavity structure 1 and the hollow cylindrical foam float 2 due to the influence of sea waves and currents, thereby causing irreversible damage to the damping device.

[0022] When the sea condition is stable, the water baffle 3 in the cavity moves to the upper part of the cavity due to the gravity of the stainless steel weight 6, and the water baffle 3 is at the initial position. At the same time, the one-way check water inlet valve 9 is kept open to fill the entire cavity with seawater. When the floating structure at sea is affected by external factors such as wind, waves, and tides, a large motion response will be generated, causing the pull rod 4 to produce relative movement with the water baffle 3 and the cylindrical cavity structure 1. The water baffle 3 moves to the lower part of the cavity, squeezing the water in the cavity, and the water is slowly discharged outward along the outlet 10. The water baffle 3 continues to move back and forth, constantly squeezing and releasing the water, generating a damping force opposite to the external force, thereby effectively absorbing external energy and significantly reducing the mooring force borne by the entire mooring system. In addition, the diameter of the cylindrical cavity structure 1, the weight of the stainless steel weight 6 (or counterweight), the one-way check water inlet valve 9, and the aperture size of the outlet 10 can be adjusted to adapt to different sea conditions.

[0023] As an embodiment of the present invention, the cylindrical cavity structure 1 can be made of stainless steel, with a length of 3m, an outer diameter of 600mm, and a thin wall thickness of 40mm. The diameter of the one-way check water inlet valve 9 on the cylindrical cavity structure 1 is 200mm, the diameter of the water outlet 10 is 100mm, and the aperture of the hole cover 11 is 60mm. The hollow cylindrical foam float 2 can be made of polystyrene foam material, with a length of 1.8m, an outer diameter of 1200mm, and a thin wall thickness of 100mm. The water retaining plate 3 and the pull rod 4 can be made of stainless steel, and the diameter of the water retaining plate 3 is 520mm and the thickness is 50mm. The length of the pull rod 4 is 3m and the diameter is 100mm. The length of the steel wire rope 8 is 5m and the wire diameter is 30mm. The diameter of the pulley 5 is 460mm, and the length of the pulley bracket 7 is 600mm.

[0024] The above specific implementation methods of the present invention are for inspiration. Through the above description, relevant staff can make various changes and modifications without departing from the scope of the invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A mooring damping device suitable for an offshore floating structure, characterized in that: The invention comprises a cylindrical cavity structure (1), a hollow cylindrical foam float (2), a water baffle (3), a pull rod (4), a steel cable (8), a one-way check water inlet valve (9), and a water outlet (10). The hollow cylindrical foam float (2) is nested on the surface of the cylindrical cavity structure (1). A cover with holes (11) is provided on the top of the cylindrical cavity structure (1). The cylindrical cavity structure (1) serves as the main frame of the damping device. A circular water baffle (3) is provided inside the structure. A pull rod (4) connected to the water baffle is provided from the bottom of the cylindrical cavity structure (1). The water baffle (3) is extended and includes a transmission system for realizing the reciprocating movement of the water baffle (3). The steel wire cable (8) is connected to the water baffle (3). Driven by the transmission system, the water baffle (3) moves back and forth in the cavity of the cylindrical cavity structure (1). A one-way non-return water inlet valve (9) and a water outlet (10) are arranged on the surface of the cavity. When the water baffle (3) continues to move back and forth, water continuously enters from the one-way non-return water inlet valve (9) and is discharged from the water outlet (10). By continuously squeezing and releasing the water, a damping force is generated.

2. The mooring damping device according to claim 1, characterized in that: The transmission system consists of a steel cable (8), a pulley (5) and a pulley bracket (7). The pulley bracket (7) and the pulley (5) are arranged on the top surface of the cylindrical cavity structure (1). The steel cable (8) passes around the pulley (5), one end of which passes through the cavity structure (1) and is connected to the water retaining plate (3), and the other end is connected to the stainless steel weight (6).

3. The mooring damping device according to claim 1, characterized in that: The one-way check water inlet valve (9) is arranged on the lower surface of the cylindrical cavity structure (1) and only allows seawater to flow from outside the cavity into the cavity, thereby ensuring that an appropriate amount of water is always maintained inside the cavity.

4. The mooring damping device according to claim 1, characterized in that: The water outlet (10) is arranged on the upper surface of the cylindrical cavity structure (1) and is a through structure capable of letting water in and out.

5. The mooring damping device according to claim 1, characterized in that: The hollow cylindrical foam float (2) nested outside the cylindrical cavity structure (1) is made of a lightweight material that can provide sufficient buoyancy, including but not limited to polystyrene foam material.

6. The mooring damping device according to claim 1, characterized in that: The perforated cover (11) is provided with six small holes for the steel wire rope (8) to pass through the cavity to connect with the water retaining plate (3), and at the same time prevent the upper cavity of the water retaining plate (3) from generating a vacuum, thereby avoiding the movement of the water retaining plate (3) in the cylindrical cavity structure (1) to be restricted.

7. The mooring damping device according to any one of claims 1 to 6, characterized in that: The damping effect of the mooring damping device is achieved by adjusting the parameters of the diameter of the cylindrical cavity structure (1), the weight of the stainless steel weight (6), the one-way check water inlet valve (9) and the aperture size of the water outlet (10) to adapt to different sea conditions.

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