Water damping elastic cable for reducing peak value of offshore floating photovoltaic mooring force

Abstract

The invention provides a water damping elastic cable for reducing the peak value of offshore floating photovoltaic mooring force, and relates to the field of ocean engineering and renewable energy sources. The device comprises main components such as a steel sleeve, a pressure spring, a pull rod, a backflow hole and a check valve. The steel sleeve is sealed to form a closed space, the internal pull rod and the pressure spring push plate move under the action of stress to drive the pressure spring to be compressed or rebounded, meanwhile, water flows among the backflow holes, and the water damping effect is generated. The damping effect can be flexibly regulated and controlled by adjusting the size of the backflow hole. The upper check valve and the lower check valve are installed on a top cover and a bottom cover of the steel sleeve respectively, one-way flowing of water is achieved, damping in the spring compression process is not affected, and meanwhile damping generated when the compression spring rebounds is reduced. The device is not only suitable for an offshore floating photovoltaic system, but also can be applied to mooring systems of other floating body structures for wind power generation and the like, and the wind wave resistance and the operation stability of the system are improved by reducing the instantaneous tension peak value.

Description

Technical Field

[0001] The present invention relates to the fields of marine engineering and renewable energy, and in particular to a water-damped elastic cable for reducing the peak value of mooring force in an offshore floating photovoltaic system, aiming to improve the safety and economy of offshore floating photovoltaic mooring. Background Art

[0002] As global energy demand grows, offshore floating photovoltaic systems are gaining attention as an efficient and clean way to obtain energy. This system installs photovoltaic panels on an offshore floating structure, which floats stably in the ocean and uses solar energy to generate electricity. However, due to the strong dynamic characteristics of the marine environment, the floating structure is constantly impacted by natural forces such as waves, tides and wind, resulting in a large instantaneous force peak on the mooring system, which not only affects the stability of the system, but also shortens the service life of the mooring device. Therefore, how to effectively reduce the force peak of the mooring system has become the key to ensuring the long-term stable operation of the offshore floating photovoltaic system.

[0003] Traditional mooring systems mostly use rigid mooring cables or elastic mooring cables, but these two methods still have limitations in reducing peak force. Rigid mooring cables cannot effectively absorb instantaneous impact forces, and conventional elastic mooring cables cannot fully protect the system due to their elastic characteristics when facing wave loads, so the overall impact resistance of the mooring system is limited. Therefore, an innovative mooring device that can generate effective damping under wave loads is needed, which can not only reduce the instantaneous tension peak, but also quickly return to the initial state to adapt to periodic wave impacts.

[0004] Based on this, the present invention provides a water-damped elastic cable structure, which achieves a buffering effect on wave loads and can reduce the peak tension of the mooring system, thereby significantly improving the wind and wave resistance and service life of the offshore floating photovoltaic system. Summary of the invention

[0005] The present invention relates to an offshore floating photovoltaic system, and in particular to a water-damped elastic cable for reducing the peak force of the mooring force of the offshore floating photovoltaic system. With the continuous promotion of offshore floating photovoltaic systems in practical applications, under the action of natural loads such as waves and wind, the force borne by the mooring system will produce a peak with the fluctuation, which has an adverse effect on the stability and service life of the system. The present invention aims to effectively reduce the peak force of the mooring system under the action of wave loads through a water-damped elastic cable structure, thereby enhancing the system's wind and wave resistance and improving its stability and safety.

[0006] The water-damping elastic cable structure proposed in the present invention comprises a closed steel sleeve and components such as a compression spring, a reflux hole and a check valve arranged therein. The flow of water inside the water-damping elastic cable is controlled by the tension in the mooring system to achieve a damping effect.

[0007] The water damping elastic cable structure of the present invention includes a steel sleeve, which is sealed by a top cover and a bottom cover to form a closed internal space; a pull rod, one end of which is connected to the lower lifting ear, and the other end passes through the interior of the steel sleeve and is connected to the compression spring through a compression spring push plate; a rubber plug is provided on the compression spring push plate to ensure the sealing effect between the compression spring push plate and the steel sleeve to prevent water penetration. The upper lifting ear is used to connect the water damping elastic cable to the floating structure of the floating photovoltaic system; the lower lifting ear is used to connect the water damping elastic cable to the mooring hook; the upper backflow hole and the lower backflow hole are respectively arranged at the upper and lower parts of the steel sleeve to control the flow of water; the upper check valve and the lower check valve are respectively arranged at the top cover and the bottom cover of the steel sleeve to achieve unidirectional flow of water.

[0008] When the wave load is large, the water damping elastic cable compresses the spring through the internal pull rod and compression spring push plate structure, and uses the backflow hole to limit the flow of water to generate damping, thereby effectively reducing the instantaneous tension. When the wave load decreases, the spring rebounds, and the internal water flow realizes one-way flow through the check valve, so that the water damping elastic cable quickly returns to its initial state and prepares for the next wave impact.

[0009] The water-damped elastic cable of the present invention can be used for an offshore floating photovoltaic mooring system, which includes a photovoltaic floating structure, a photovoltaic panel provided on the photovoltaic floating structure, a water-damped elastic cable, a mooring rope and an anchor block connected to the photovoltaic floating structure, and the water-damped elastic cable is the water-damped elastic cable structure described above in the present invention.

[0010] The water damping elastic cable structure of the present invention is reasonably designed, and the water damping effect is maximized by optimizing the design of the water flow channel. The device not only provides effective damping at the peak force, but also quickly restores the initial shape when the force decreases, which is suitable for the long-term stable operation of the offshore floating photovoltaic system. The present invention can be widely used in floating structure mooring systems such as offshore photovoltaics and wind power generation. By reducing the instantaneous peak force of the mooring system, the service life of the mooring device is extended, and the wind and wave resistance and operational reliability of the equipment are improved.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1) Reducing the peak value of mooring force: The present invention effectively reduces the instantaneous peak force of the offshore floating photovoltaic system under the action of wave loads through the structural design of the water-damped elastic cable, thereby enhancing the system's ability to resist wind and waves.

[0013] 2) Improve system stability and safety: Water-damped elastic cables produce significant damping effects when wave loads are large, reducing the transmission of instantaneous tension, thereby improving the stability and safety of the system in harsh marine environments.

[0014] 3) Rapid recovery capability: The design of the spring and check valve enables the water damping elastic cable to quickly return to its initial state after the force is reduced, providing adequate preparation for the next wave impact and ensuring the continued effectiveness of the damping cable under cyclic loads.

[0015] 4) Extending the life of the mooring system: By reducing the peak value of the mooring force, the present invention effectively reduces the wear and fatigue of key components of the system and extends the service life of the entire mooring system.

[0016] 5) Wide adaptability: The present invention is not only applicable to offshore floating photovoltaic systems, but can also be applied to mooring systems of offshore floating structures such as wind power generation, providing various types of floating devices with higher load resistance in complex marine environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an offshore floating photovoltaic mooring system equipped with the present invention.

[0018] Figure 2 This is a schematic diagram of a water damping elastic cable structure for reducing the peak force of offshore floating photovoltaic mooring proposed by the present invention;

[0019] Figure 3 This is the AA cross-sectional view of a water damping elastic cable for reducing the peak force of offshore floating photovoltaic mooring proposed by the present invention;

[0020] Figure 4 It is a schematic diagram of an upper check valve of a water damping elastic cable for reducing the peak force of an offshore floating photovoltaic mooring proposed by the present invention;

[0021] Figure 5 It is a schematic diagram of a lower check valve of a water damping elastic cable for reducing the peak force of an offshore floating photovoltaic mooring proposed by the present invention;

[0022] Legend: 1. Offshore floating photovoltaic floating structure; 2. Photovoltaic panel; 3. Water damping elastic cable; 4. Mooring handle; 5. Anchor block; 301. Steel sleeve; 302. Top cover; 303. Bottom cover; 304. Upper lifting lug; 305. Lower lifting lug; 306. Pull rod; 307. Upper return hole; 308. Lower return hole; 309. Compression spring; 310. Compression spring push plate; 311. Rubber plug; 312. Water tank joint; 313. Upper check valve; 314. Lower check valve. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Reference Figure 1 The present invention designs a water-damped elastic cable 3 for reducing the peak force of offshore floating photovoltaic mooring, which is connected to the offshore floating photovoltaic floating structure 1 through an upper lifting lug 304, and connected to the mooring handle 4 through a lower lifting lug 305, and finally connected to the anchor block 5 by the mooring handle 4 to form a complete offshore floating photovoltaic mooring system.

[0027] See also Figure 2 and Figure 3 The water damping elastic cable 3 includes main components such as an external steel sleeve, a compression spring, a reflux hole and a check valve. Specifically, it includes a steel sleeve 301, a top cover 302, a bottom cover 303, an upper lifting lug 304, a lower lifting lug 305, a pull rod 306, an upper reflux hole 307, a lower reflux hole 308, a compression spring 309, a compression spring push plate 310, a rubber plug 311, a water tank joint 312, an upper check valve 313, and a lower check valve 314.

[0028] The steel sleeve 301 is made of stainless steel material, and its two ends are sealed by the top cover 302 and the bottom cover 303 to form a closed internal space. The pull rod 306 is connected to the compression spring 309 through the compression spring push plate 310, and runs through the inside of the steel sleeve 301. The other end is connected to the lower hanging ear 305, which can drive the compression spring 309 to compress or release when the lower hanging ear 305 is stressed. The compression spring push plate 310 is equipped with rubber plugs 311 around to ensure the sealing effect between the compression spring push plate 310 and the steel sleeve 301, and prevent water from penetrating from the gap. The upper backflow hole 307 and the lower backflow hole 308 are respectively arranged at the upper and lower parts of the steel sleeve, and are located on both sides of the compression spring push plate 310, which are used to realize the flow of water, thereby generating a damping effect. The upper check valve 313 and the lower check valve 314 are respectively installed on the top cover 302 and the bottom cover 303 through the water tank joint 312 to realize the effect of one-way flow. The flow direction of the upper check valve 313 is from the inside of the steel sleeve 301 to the outside, and the flow direction of the lower check valve 314 is from the outside of the steel sleeve 301 to the inside of the steel sleeve 301 .

[0029] In addition, since the lower part of the water damping elastic cable 3 is connected to the mooring rope 4, it will be initially affected by the tension of the mooring rope. Therefore, during actual installation, the compression spring 309 in the water damping elastic cable 3 is pre-compressed to produce a certain initial deformation to resist the initial effect of the mooring rope tension.

[0030] The specific working process is as follows: when the wave load increases, the tension on the upper hanging ear 304 and the lower hanging ear 305 of the water damping elastic cable 3 increases, causing the pull rod 306 to move downward, driving the compression spring push plate 310 to compress the compression spring 309. In this process, since the compression spring push plate 310 is in close contact with the steel sleeve 301 through the rubber plug 311, after the compression spring push plate 310 moves downward, the upper backflow hole 307 will suck in water and the lower backflow hole 308 will discharge water, thereby generating a water damping effect. In the present invention, the areas of the upper backflow hole 307 and the lower backflow hole 308 are adjustable to adjust the water flow rate, thereby changing the water damping effect. The smaller the backflow hole, the more significant the damping effect. If the area of ​​the upper backflow hole 307 or the lower backflow hole 308 is set to 0, the compression spring push plate 310 will not be pulled, and the limit position of the compression spring push plate 310 is the lower edge of the lower backflow hole 308, because the lower side is a closed space at this time and cannot continue to move. When the wave load is weakened, the compression spring 309 begins to rebound, the lower backflow hole 308 and the lower check valve 314 enter water, and the upper backflow hole 307 and the upper check valve 313 discharge water. Although this process also has a damping effect, it is smaller than the damping effect of the tension process. The purpose is to enable the compression spring 309 to rebound quickly. The above is the complete working process of the water-damped elastic cable 3. This process is repeated in periodic wave loads, thereby continuously weakening the peak value of the mooring force.

[0031] 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 water damping elastic cable for reducing the peak force of offshore floating photovoltaic mooring, characterized in that: The water damping elastic cable comprises: a steel sleeve (301) which is sealed by a top cover (302) and a bottom cover (303) to form a closed internal space; a pull rod (306) having one end connected to a lower lifting ear (305) and the other end passing through the interior of the steel sleeve (301) and connected to a compression spring (309) via a compression spring push plate (310); an upper lifting ear (304) for connecting the water damping elastic cable to a floating structure of a floating photovoltaic system; a lower lifting ear (305) for connecting the water damping elastic cable to a mooring yoke (4); an upper backflow hole (307) and a lower backflow hole (308) respectively arranged at the upper and lower parts of the steel sleeve (301) to control the flow of water; and an upper check valve (313) and a lower check valve (314) respectively arranged at the top cover (302) and the bottom cover (303) of the steel sleeve (301) to achieve unidirectional flow of water.

2. The water damping elastic cable according to claim 1, characterized in that: The compression spring push plate (310) is provided with a rubber plug (311) for ensuring the sealing effect between the compression spring push plate (310) and the steel sleeve (301) to prevent water penetration.

3. The water damping elastic cable according to claim 1, characterized in that: The flow direction of the upper check valve (313) is from the inside of the steel sleeve (301) to the outside, and the flow direction of the lower check valve (314) is from the outside of the steel sleeve (301) to the inside.

4. The water damping elastic cable according to claim 1, characterized in that: The steel sleeve (301) is made of stainless steel material and is used to improve the corrosion resistance and durability of the water damping elastic cable.

5. The water damping elastic cable according to claim 1, characterized in that: The upper check valve (313) and the lower check valve (314) are respectively installed on the top cover (302) and the bottom cover (303) through the water tank joint (312) to achieve a one-way flow function.

6. The water damping elastic cable according to claim 1, characterized in that: The areas of the upper reflux hole (307) and the lower reflux hole (308) are adjustable to adjust the flow rate of the water body, thereby changing the water damping effect.

7. An offshore floating photovoltaic mooring system, comprising a photovoltaic floating structure (1), a photovoltaic panel (2) provided on the photovoltaic floating structure (1), a water damping elastic cable (3) connected to the photovoltaic floating structure (1), a mooring hook (4) and an anchor block (5), characterized in that: The water-damping elastic cable (3) is the water-damping elastic cable according to any one of claims 1 to 6.

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