Efficient wave energy power generation device for multidirectional wave sea conditions

Abstract

The invention provides an efficient wave energy power generation device for multidirectional wave sea conditions, and belongs to the technical field of power generation devices, the efficient wave energy power generation device for multidirectional wave sea conditions comprises an energy harvesting structure, a PTO system and a supporting structure; the energy harvesting structure is an oscillating floater in a special shape, a long yawing plate and a short yawing plate are arranged on the periphery of the floater, and the top of the floater is connected to the transmission plate through a connecting column. The PTO system absorbs the kinetic energy of the floater by connecting the transmission plate, and converts the kinetic energy of heaving and yawing into electric energy through the two sets of hydraulic devices; the supporting structure comprises a supporting platform and a motion limiting column, a PTO system is arranged above the supporting platform, and the motion limiting column vertically and downwards penetrates through the horizontal center of the floater from the supporting platform. And the operation stability and the power generation efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power generation devices, and in particular, relates to a high-efficiency wave energy power generation device for multi-directional wave sea conditions. Background Art

[0002] At a time when the world is in urgent need of clean energy, marine energy has become a key development direction in the energy field due to its rich reserves and sustainable renewable advantages. Wave energy, as a highly potential part of marine energy, has attracted much attention due to its high energy density and wide distribution. The research and development of efficient wave energy power generation devices is of great significance to alleviating the energy crisis and promoting sustainable development of energy. At present, oscillating water column type, oscillating float type, and overboard type are common wave energy power generation technologies and devices. In a single ocean environment, these devices have achieved certain results in capturing and converting wave energy in a single wave direction. Traditional wave energy power generation devices are mostly designed based on an idealized ocean environment model, assuming that waves propagate in one direction, and the energy capture and conversion system is optimized accordingly.

[0003] Although the oscillating float type can absorb part of the energy of multi-directional waves in the heave direction, it can only use the energy corresponding to the heave degree of freedom, and the energy absorption of other degrees of freedom is limited. In terms of the longitudinal and pitch degrees of freedom, it is mainly adapted to a single wave direction, and has weak energy absorption capacity in the face of complex marine conditions. However, by releasing the bow freedom, it can better cope with complex wave pressure differences when multiple wave directions act. The actual marine environment is far more complex than the idealized model. In open waters, multi-directional wave cross-propagation is very common, with a probability of 70%-80%. Affected by monsoons, ocean currents, topography, storms, etc., the propagation directions of ocean waves in different regions are complex and changeable. In waters near the continental shelf or islands, the terrain effect exacerbates the complexity of wave propagation direction, and waves in different directions converge to produce interference superposition, forming a complex wave shape. This complex wave environment poses a huge challenge to traditional wave energy power generation devices. When multi-directional waves act, traditional devices cannot efficiently capture and utilize energy due to design limitations, and some energy will also produce impact interference, affecting operational stability and power generation efficiency, and even damaging the device. Summary of the invention

[0004] In view of this, the present invention provides a high-efficiency wave energy power generation device for multi-directional wave conditions, which solves the problem that traditional wave energy power generation devices are unable to efficiently capture and utilize wave energy in different directions in complex multi-directional wave environments, thereby improving operational stability and power generation efficiency.

[0005] The present invention is achieved in that:

[0006] The present invention provides a high-efficiency wave energy power generation device for multi-directional wave sea conditions, which includes an energy capture structure, a PTO system and a supporting structure;

[0007] The energy capture structure is an oscillating float with a special shape, a bow long plate and a bow short plate are arranged on the periphery of the float, and the top of the float is connected to the transmission plate through a connecting column;

[0008] The PTO system absorbs the kinetic energy of the float by connecting the transmission plate, and converts the kinetic energy of the heave and bow swing into electrical energy through two sets of hydraulic devices;

[0009] The support structure includes a support platform and a motion limiting column. The PTO system is arranged above the support platform. The motion limiting column passes through the horizontal center of the float vertically downward from the support platform to limit the float from heaving and pitching along the motion limiting column.

[0010] The technical effects of a high-efficiency wave energy power generation device for multi-directional wave sea conditions provided by the present invention are as follows: the device can fully absorb the energy of waves in the heave freedom through a buoy structure that is wide at the top and narrow at the bottom, and the energy conversion process can be made safer and more efficient by connecting it to the PTO system through a transmission plate and installing the PTO system on a supporting platform.

[0011] On the basis of the above technical solution, the high-efficiency wave energy power generation device for multi-directional wave sea conditions of the present invention can also be improved as follows:

[0012] Among them, the float body is a stepped cylinder that is wide at the top and narrow at the bottom, and the float includes a float upper structure and a float lower structure; the float upper structure is the upper half of the stepped cylinder that is wide at the top and narrow at the bottom; the float lower structure is the lower half of the stepped cylinder.

[0013] The special shape of the oscillating float combined with the bow long board and short board can effectively receive multi-directional wave impacts and improve the efficiency of wave energy capture. The heave and bow motion energy is converted into electrical energy through two sets of hydraulic devices to achieve multi-degree-of-freedom energy utilization. The support structure ensures the stable operation of the device and adapts to different sea conditions. When in use, the support structure is first fixed to the seabed or arranged as a floating platform as required, and then the energy capture structure and PTO system are installed and connected and debugged, and then it can be put into use.

[0014] Furthermore, the three bow rocking long boards and the three bow rocking short boards are respectively vertically distributed on the periphery of the float, and the bow rocking long boards and the bow rocking short boards are alternately arranged.

[0015] The bow swing long board and bow swing short board are made of high-strength engineering plastics. The bow swing long board and short board are evenly and alternately distributed to enhance the adaptability to waves in different directions. In addition, high-strength engineering plastics have low cost and good corrosion resistance, which reduces the overall cost of the device and the difficulty of maintenance.

[0016] Furthermore, there are three connecting columns distributed in an equilateral triangle, one end of which is fixed to the top of the float upper structure and the other end is connected to the transmission plate.

[0017] The connection column is made of high-strength alloy steel. Three high-strength alloy steel connection columns distributed in an equilateral triangle ensure a stable connection, can effectively transfer the kinetic energy of the float to the transmission plate, and the structural design is reasonable, which improves the overall strength and stability of the device.

[0018] Furthermore, the transmission plate is a horizontal circular plate, and radially distributed reinforcing ribs are provided on the surface.

[0019] The transmission plate is made of stainless steel. The surface of the stainless steel transmission plate is equipped with radial reinforcement ribs to enhance the strength of the transmission plate, prevent deformation during energy transfer, ensure stable transmission, and guarantee the reliability of the power generation process.

[0020] Furthermore, the PTO system includes a heave energy conversion hydraulic device, a bow swing energy conversion hydraulic device, a hydraulic energy storage system and a power generation component; the heave energy conversion hydraulic device is connected to the transmission plate through a universal ball joint, and the bow swing energy conversion hydraulic device is connected to the transmission plate through a connecting rod mechanism.

[0021] The various parts of the PTO system work together. The heave and bow swing energy conversion hydraulic devices convert energy for different forms of movement respectively. The hydraulic energy storage system stores energy to ensure stable and continuous power generation of the power generation components, thereby improving power generation efficiency and stability.

[0022] Furthermore, the motion limiting column is a vertical cylinder with a smooth surface, and maintains an appropriate gap between the column and the center hole of the float, thereby limiting the float from performing heave and pitch motion along the motion limiting column.

[0023] The motion limiting column is made of corrosion-resistant alloy material.

[0024] Further, the heave energy conversion hydraulic device comprises a heave hydraulic cylinder, a piston rod and a hydraulic pipeline;

[0025] The bowing energy conversion hydraulic device comprises a bowing hydraulic cylinder, a rotary joint and a connecting rod mechanism;

[0026] The hydraulic energy storage system is composed of a plurality of accumulators, which are respectively connected to the hydraulic pipelines of the heave swing and yaw swing energy conversion hydraulic devices;

[0027] The power generation assembly includes a hydraulic motor and a generator. The hydraulic energy output by the hydraulic energy storage system drives the hydraulic motor to rotate, and the hydraulic motor drives the generator to generate electricity.

[0028] The hydraulic energy storage system composed of multiple accumulators can effectively store hydraulic energy converted from different forms of motion, ensure stable energy supply, and avoid unstable power generation due to wave energy fluctuations. The power generation components are driven by the hydraulic energy storage system to achieve efficient conversion of wave energy to electrical energy. The hydraulic motor and generator work well together to improve the quality and efficiency of power generation.

[0029] Furthermore, the supporting platform is a fixed platform or a floating platform.

[0030] When the supporting platform is a fixed platform, it is built on the seabed with reinforced concrete or steel structure and connected to the seabed through a pile foundation or a gravity foundation; when the supporting platform is a floating platform, it is composed of a pontoon and a mooring system, the pontoon provides buoyancy, and the mooring system fixes the platform through anchor cables and anchors.

[0031] Furthermore, the upper structure of the float is made of carbon fiber reinforced composite material, and the lower structure of the float is made of aluminum alloy.

[0032] The upper and lower parts of the float are made of different materials. The upper part is made of lightweight and high-strength composite materials to reduce weight and facilitate vertical swing movement; the lower part is made of high-strength seawater corrosion-resistant material to ensure long-term stable operation in harsh marine environments and extend the service life of the device.

[0033] Compared with the prior art, the beneficial effects of the high-efficiency wave energy power generation device for multi-directional wave sea conditions provided by the present invention are:

[0034] Efficiently capture multi-directional wave energy: The present invention releases two degrees of freedom, heave and bow, through a special oscillating float design, and can capture wave energy from different directions at the same time. The bow long plate and bow short plate evenly distributed on the periphery of the float can generate torque under the pressure difference of multi-directional waves, causing the float to bow, thereby making full use of the energy in a complex wave environment;

[0035] Enhanced energy conversion efficiency:

[0036] Through two independent hydraulic devices (heaving energy conversion hydraulic device and bowing energy conversion hydraulic device), the present invention can convert heaving and bowing motion energy into electrical energy respectively. The introduction of the hydraulic energy storage system further improves the stability and continuity of energy conversion, ensuring efficient power generation even when wave energy is unstable;

[0037] Adapt to complex marine environment:

[0038] The support structure of the present invention is flexible in design, and the support platform can be fixed or floating, which can adapt to the environmental conditions of different sea areas. The design of the motion limiting column not only limits the movement of the float in unnecessary directions, but also ensures the stability and controllability of the float in heave and pitch motion;

[0039] High structural strength and durability:

[0040] The upper structure of the float is made of lightweight and high-strength carbon fiber reinforced composite materials, the lower structure is made of seawater corrosion-resistant aluminum alloy, the bow long plate and short plate are made of high-strength engineering plastics, the connecting column is made of high-strength alloy steel, and the transmission plate is made of stainless steel. The selection of these materials ensures the long-term and stable operation of the device in complex marine environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic side view of a high-efficiency wave energy power generation device facing multi-directional wave sea conditions;

[0042] Figure 2 It is a schematic front view of a high-efficiency wave energy power generation device facing multi-directional wave sea conditions;

[0043] Figure 3 It is a left-side schematic diagram of a high-efficiency wave energy power generation device facing multi-directional wave sea conditions;

[0044] Figure 4 It is a right side schematic diagram of a high-efficiency wave energy power generation device facing multi-directional wave sea conditions;

[0045] Figure 5 A schematic top view of a high-efficiency wave energy power generation device facing multi-directional wave sea conditions;

[0046] Figure 6 It is a schematic diagram of a high-efficiency wave energy power generation device facing multi-directional wave sea conditions from an upward perspective;

[0047] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0048] 1. Motion limiting column; 2. Transmission plate; 3. Connecting column; 4. Float upper structure; 5. Bow swing long board; 6. Bow swing short board; 7. Float lower structure. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0050] like Figure 1As shown, it is a first embodiment of a high-efficiency wave energy power generation device for multi-directional wave conditions provided by the present invention. In this embodiment, it includes an energy capture structure, a PTO system, and a support structure; the energy capture structure is an oscillating float of a special shape, and the float body is a stepped cylinder that is wide at the top and narrow at the bottom. Three vertical long plates and three vertical short plates are evenly distributed on the periphery of the float, which are bow swing long plates 5 and bow swing short plates 6. The energy capture structure releases the freedom of heave and bow swing. A transmission plate 2 is connected to the top of the float through three connecting columns 3. The shape of the transmission plate 2 is horizontal. The circular plate and the transmission plate 2 can swing vertically and pitch forward along with the float; the PTO system absorbs the kinetic energy of the float by connecting the transmission plate 2, and converts the motion energy of the heave and pitch forward into electrical energy through two sets of hydraulic devices respectively; the supporting structure includes a supporting platform and a motion limiting column 1, the supporting platform can be a fixed or floating platform, a PTO system is arranged above the platform, a vertical cylinder penetrating vertically downward from the platform into the sea surface is the motion limiting column 1, the motion limiting column 1 passes through the horizontal center of the float, and can limit the float from swinging vertically and pitching forward along the motion limiting column 1.

[0051] like Figure 2 , Figure 3 , Figure 4 As shown, the energy capture structure includes a float upper structure 4, a float lower structure 7, a bow rocker long plate 5, a bow rocker short plate 6, a connecting column 3 and a transmission plate 2; the float upper structure 4 is the upper half of a stepped cylinder that is wide at the top and narrow at the bottom, and is made of a lightweight and high-strength composite material, such as a carbon fiber reinforced composite material. This material has an excellent strength-to-weight ratio, which can not only ensure the structural integrity of the float under the action of waves, but also reduce its own weight and improve the response sensitivity to wave energy. Its larger upper surface area can effectively increase the contact area with the waves, and during the vertical swing movement, it can more fully capture the energy of the waves in the vertical direction; the float lower structure 7, as the lower half of the stepped cylinder, is also made of a high-strength and seawater corrosion-resistant material, such as an aluminum alloy. Compared with the upper structure, its diameter is smaller, which helps to lower the center of gravity of the float in the water and enhance the stability of the float in the waves. The float lower structure 7 goes deep into the sea water, and under the action of waves, it can produce a motion response different from that of the upper structure, further enriching the way the float captures wave energy; as shown Figure 5 , Figure 6As shown, the long bow plate 5 and the short bow plate 6 are evenly distributed on the periphery of the float, and the long bow plate 5 and the short bow plate 6 are arranged alternately. They are all made of high-strength engineering plastics, which has good strength. The long bow plate 5 is relatively long, and its main function is to generate a large torque under the pressure difference of multi-directional waves, so that the float is more likely to bow-roll. The short bow plate 6 is relatively short, and its distribution position cooperates with the long plate. On the one hand, it assists the long plate in guiding the water flow, and on the other hand, it can adjust the force balance of the float when waves in different directions act, so as to avoid excessive tilting or flipping of the float due to uneven force, thereby ensuring the stability and controllability of the float during bow-rolling movement; there are three connecting columns 3, which are made of high-strength alloy steel and have good compression and tensile properties. One end of the connecting column 3 is fixed to the top of the float superstructure 4 by welding or high-strength bolt connection, and the other end is connected to the transmission plate 2. The three connecting columns 3 are distributed in an equilateral triangle. This layout method It can ensure the connection stability between the transmission plate 2 and the float. No matter the float is in the process of heaving or bowing motion, the movement of the float can be accurately and smoothly transmitted to the transmission plate 2. The length of the connecting column 3 is precisely designed to ensure that there is enough activity space between the transmission plate 2 and the float, and to ensure that the transmission plate 2 can closely follow the movement of the float. The transmission plate 2 is in the shape of a horizontal circular plate, made of stainless steel with moderate thickness, and has high strength and corrosion resistance. The transmission plate 2 is connected to the float through the connecting column 3 and can perform heaving and bowing motions with the float. During the heaving motion, the transmission plate 2 transmits the vertical motion of the float to the heaving energy conversion hydraulic device. During the bowing motion, the transmission plate 2 drives the bowing connection structure, and then transmits the motion to the bowing energy conversion hydraulic device. Some reinforcing ribs are arranged on the surface of the transmission plate 2. These reinforcing ribs are radially distributed, which further enhances the structural strength of the transmission plate 2, so that it can withstand various stresses generated during complex motions.

[0052] The PTO system includes a heave swing energy conversion hydraulic device, a bow swing energy conversion hydraulic device, a hydraulic energy storage system and a power generation component; the heave swing energy conversion hydraulic device is mainly composed of a heave swing hydraulic cylinder, a piston rod, a hydraulic pipeline and a heave swing connection structure. The heave connection structure adopts a special universal ball joint, one end of which is tightly fixed to the center position of the transmission plate 2 by a high-strength bolt to ensure the stability of the connection, and the other end is connected to the top of the piston rod. The universal ball joint can flexibly adapt to the slight angle changes of the transmission plate 2 during the heave movement, ensuring that the piston rod can always accurately follow the transmission plate 2 to make reciprocating motion in the vertical direction. The cylinder body of the heave hydraulic cylinder is firmly fixed on the supporting platform. When the float swings, the transmission plate 2 drives the universal ball joint, and then drives the piston rod to reciprocate in the heave hydraulic cylinder. In this process, the hydraulic oil in the hydraulic cylinder is compressed or sucked, and the transmission of hydraulic energy is realized through the hydraulic pipeline; the bow swing energy conversion hydraulic device includes a bow swing hydraulic cylinder, a rotating joint, a specially designed connecting rod mechanism and a bow swing connection structure. The bow swing connection structure consists of a connecting bracket with a rotating shaft and a group of transmission arms. It is fixed to the edge of the transmission plate 2 by welding or bolting, and its rotation axis maintains a certain distance from the center of the transmission plate 2 to meet the radius requirement of the bowing motion. One end of the transmission arm is movably connected to the rotation axis of the connecting bracket, and the other end is connected to the connecting rod mechanism through a rotating joint. When the float generates a bowing motion, the rotation movement of the transmission plate 2 drives the connecting bracket to rotate around its rotation axis, and transmits the motion to the connecting rod mechanism through the transmission arm. The connecting rod mechanism then converts the rotational motion into the linear motion of the piston rod in the bowing hydraulic cylinder, and then compresses or pumps the hydraulic oil to realize the hydraulic conversion of the bowing direction energy; the hydraulic energy storage system is composed of a plurality of accumulators, which are respectively connected to the hydraulic pipelines of the vertical swing and bowing energy conversion hydraulic devices. The accumulator can store the excess hydraulic energy generated by the hydraulic device. When the wave energy is unstable, it provides a stable hydraulic power source for the power generation component to ensure the continuity of the power generation process; the power generation component adopts a combination of a hydraulic motor and a generator. The stable hydraulic energy output by the hydraulic energy storage system drives the hydraulic motor to rotate, and the hydraulic motor then drives the generator to generate electricity, converting mechanical energy into electrical energy output;

[0053] The supporting structure includes a supporting platform and a motion limiting column 1; if the supporting platform is a fixed platform, it is usually built on the seabed with reinforced concrete or steel structure, and is firmly connected to the seabed through a pile foundation or a gravity foundation to ensure the stability of the platform in complex sea conditions. If it is a floating platform, it is composed of a pontoon, a mooring system, etc. The pontoon provides buoyancy to ensure that the platform floats on the sea surface. The mooring system fixes the platform at a predetermined position through anchor cables and anchors to prevent the platform from drifting. The PTO system is installed on the supporting platform to facilitate energy conversion and equipment maintenance; the motion limiting column 1 is a vertical high-strength cylinder that penetrates the sea surface vertically downward from the supporting platform into the sea water and passes through the horizontal center of the float. The surface of the motion limiting column 1 is smooth and maintains an appropriate gap with the center hole of the float, which can allow the float to swing and pitch along the motion limiting column 1, and limit the unnecessary movement of the float in other directions, ensuring the stability and controllability of the energy capture structure movement. The motion limiting column 1 is made of corrosion-resistant alloy material, which can withstand the corrosion of sea water and the impact of waves, and ensure long-term stable operation.

[0054] In order to better understand and implement the present invention, the following is a second embodiment of a specific application scenario of the present invention in real life: a coastal city plans to use ocean wave energy to generate electricity to meet the electricity demand of part of the city. Due to the complex and changeable wave directions in this sea area, the efficiency of traditional wave energy power generation devices is low. Therefore, the project team adopted the high-efficiency wave energy power generation device of the present invention for multi-directional wave sea conditions.

[0055] The project team selected a wave energy power generation device adapted to the local sea conditions. The upper structure of the oscillating float of the energy-capturing structure is made of T700-grade carbon fiber reinforced composite materials, and the lower structure is made of aluminum alloy. The bow swing long plate and bow swing short plate are evenly distributed on the periphery of the float, both of which are made of high-strength engineering plastics produced by BASF of Germany. Three high-strength alloy steel connecting columns distributed in an equilateral triangle are made of S690QL high-strength steel, connecting the upper structure of the float to the transmission plate made of 304 stainless steel with radial reinforcement ribs on the surface.

[0056] In the PTO system, the heave energy conversion hydraulic device uses a PV046 hydraulic pump, which is connected to the transmission plate through a universal ball joint; the bow energy conversion hydraulic device uses an A10VSO45 hydraulic pump, which is connected to the transmission plate through a connecting rod mechanism. The hydraulic energy storage system consists of 8 HX-100 accumulators from Hytek, which are connected to the hydraulic pipelines of the heave and bow energy conversion hydraulic devices respectively. The output hydraulic energy drives the M4 hydraulic motor produced by Danfoss to rotate, and then drives the 1FC5 generator produced by Siemens to generate electricity.

[0057] In terms of supporting structure, due to the shallow water depth in this sea area, the supporting platform is a fixed platform built of reinforced concrete, connected to the seabed through a pile foundation. The motion limiting column is made of NS111 corrosion-resistant alloy material with a smooth surface, which limits the float from heaving and pitching along it.

[0058] In the field application, the project team installed 10 power generation devices in the sea area. Take one of the devices located at 118.5678 degrees east longitude and 23.4567 degrees north latitude as an example. Three months after the installation was completed and put into use, it experienced a storm. During the storm, the maximum wave height in the sea area reached 5 meters, the wave period was 8 seconds, and the wave direction changed within a range of about 120°. By monitoring the PTO system data, it was found that the heave and bow swing energy conversion hydraulic devices of the device were working normally, successfully capturing and converting energy from waves in different directions. According to calculations, the power generation efficiency of the device during the storm was 30% higher than that of traditional devices, and the power generation reached 500 kWh / day, while traditional devices could only reach 350 kWh / day.

[0059] In the subsequent six months of operation, the device continued to generate electricity stably, with an average monthly power generation of 20,000 kWh, meeting the electricity demand of some surrounding areas, and the reliability of the system was fully verified. According to statistics, the energy capture efficiency of the device reached an average of 70% in the past six months, which is much higher than the 40%-50% of traditional devices. In the face of normal sea conditions with a wave height of 1-3 meters and a wave period of 5-7 seconds, the power generation efficiency is stable at around 85%, which fully verifies the high efficiency and stability of the power generation device of the present invention in complex wave environments.

[0060] Specifically, the principle of the present invention is: the technical principle of the present invention is based on the efficient capture and conversion of multi-directional wave energy, specifically including the following aspects:

[0061] 1: Design and working principle of energy harvesting structure:

[0062] The energy-capturing structure is the core part of the present invention, which mainly includes an oscillating float, a bow rocking long plate, a bow rocking short plate, a connecting column and a transmission plate. The float body is a stepped cylinder that is wide at the top and narrow at the bottom. The upper structure is made of lightweight and high-strength carbon fiber reinforced composite materials, and the lower structure is made of corrosion-resistant aluminum alloy. This design not only lowers the center of gravity of the float, but also enhances its stability in waves;

[0063] Energy capture of heave motion:

[0064] The larger upper surface area of ​​the float superstructure can effectively increase the contact area with the waves, and can more fully capture the vertical energy of the waves during the heaving motion. The float substructure goes deep into the seawater, and under the action of the waves, it produces a different motion response from the superstructure, further enriching the way the float captures wave energy;

[0065] Energy capture from bow motion:

[0066] The long bow plate and short bow plate are evenly distributed around the buoy. The long bow plate is longer and can generate a larger torque under the pressure difference of multi-directional waves, causing the buoy to bow. The short bow plate assists the long plate in guiding the water flow, adjusting the force balance of the buoy to prevent the buoy from excessive tilting or flipping due to uneven force.

[0067] 2: Energy conversion mechanism of PTO system:

[0068] The PTO system absorbs the kinetic energy of the float by connecting the transmission plate, and converts the motion energy of heave and bow into electrical energy respectively;

[0069] Heave energy conversion hydraulic device:

[0070] The heave energy conversion hydraulic device is mainly composed of a heave hydraulic cylinder, a piston rod, a hydraulic pipeline and a heave connection structure. The heave connection structure adopts a universal ball joint, which can flexibly adapt to the slight angle changes of the transmission plate during the heave movement, ensuring that the piston rod can always accurately follow the transmission plate to make vertical reciprocating motion. When the floater undergoes heave motion, the transmission plate drives the universal ball joint, which in turn drives the piston rod to reciprocate in the heave hydraulic cylinder, compressing or sucking the hydraulic oil, and realizing the transmission of hydraulic energy through the hydraulic pipeline;

[0071] Bow energy conversion hydraulic device:

[0072] The bowing energy conversion hydraulic device includes a bowing hydraulic cylinder, a rotary joint, a connecting rod mechanism and a bowing connection structure. The bowing connection structure consists of a connecting bracket with a rotating shaft and a set of transmission arms. The connecting bracket is fixed to the edge of the transmission plate, and the transmission arm is connected to the connecting rod mechanism through a rotary joint. When the float generates a bowing motion, the rotational motion of the transmission plate drives the connecting bracket to rotate around its rotation axis, and the motion is transmitted to the connecting rod mechanism through the transmission arm. The connecting rod mechanism then converts the rotational motion into the linear motion of the piston rod in the bowing hydraulic cylinder, compresses or pumps the hydraulic oil, and realizes the hydraulic conversion of the bowing direction energy;

[0073] Hydraulic energy storage system and power generation components:

[0074] The hydraulic energy storage system consists of multiple accumulators, which are respectively connected to the hydraulic pipelines of the heave and bow energy conversion hydraulic devices. The accumulator can store the excess hydraulic energy generated by the hydraulic device, and provide a stable hydraulic power source for the power generation component when the wave energy is unstable. The power generation component adopts a combination of a hydraulic motor and a generator. The stable hydraulic energy output by the hydraulic energy storage system drives the hydraulic motor to rotate, and the hydraulic motor then drives the generator to generate electricity, converting mechanical energy into electrical energy output;

[0075] 3: Stability and adaptability of the supporting structure:

[0076] The supporting structure includes a supporting platform and a motion limiting column. The supporting platform can be a fixed or floating platform. The motion limiting column is a vertical cylinder that passes through the horizontal center of the float and limits the float from heaving and pitching along the motion limiting column.

[0077] Fixed support platform:

[0078] Fixed support platforms are usually built on the seabed with reinforced concrete or steel structures, and are firmly connected to the seabed through pile foundations or gravity foundations to ensure the stability of the platform in complex sea conditions;

[0079] Floating support platform:

[0080] The floating support platform consists of a pontoon and a mooring system. The pontoon provides buoyancy to ensure that the platform floats on the sea surface, and the mooring system fixes the platform in a predetermined position through anchor cables and anchors to prevent the platform from drifting.

[0081] The function of motion limiting column:

[0082] The motion limiting column is made of corrosion-resistant alloy material with a smooth surface and maintains an appropriate gap between it and the center hole of the float. It allows the float to swing and pitch along the motion limiting column, while limiting unnecessary movement of the float in other directions, ensuring the stability and controllability of the energy capture structure's movement.

[0083] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-efficiency wave energy power generation device for multi-directional wave sea conditions, characterized in that: Including energy capture structure, PTO system and supporting structure; The energy capture structure is an oscillating float with a special shape, a bow long plate and a bow short plate are arranged on the periphery of the float, and the top of the float is connected to the transmission plate through a connecting column; The PTO system absorbs the kinetic energy of the float by connecting the transmission plate, and converts the kinetic energy of the heave and bow swing into electrical energy through two sets of hydraulic devices; The support structure includes a support platform and a motion limiting column. The PTO system is arranged above the support platform. The motion limiting column passes through the horizontal center of the float vertically downward from the support platform to limit the float from heaving and pitching along the motion limiting column.

2. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 1, characterized in that: The float body is a stepped cylinder which is wide at the top and narrow at the bottom. The float includes a float upper structure and a float lower structure. The float upper structure is the upper half of the stepped cylinder which is wide at the top and narrow at the bottom. The float lower structure is the lower half of the stepped cylinder.

3. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 2, characterized in that: The three bow rocking long boards and the three bow rocking short boards are respectively vertically distributed on the periphery of the float, and the bow rocking long boards and the bow rocking short boards are alternately arranged.

4. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 3, characterized in that: There are three connecting columns, which are distributed in an equilateral triangle, one end of which is fixed on the top of the float upper structure, and the other end is connected to the transmission plate.

5. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 4, characterized in that: The transmission plate is a horizontal circular plate, and radially distributed reinforcing ribs are arranged on the surface.

6. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 5, characterized in that: The PTO system includes a heave energy conversion hydraulic device, a bow swing energy conversion hydraulic device, a hydraulic energy storage system and a power generation component; the heave energy conversion hydraulic device is connected to the transmission plate through a universal ball joint, and the bow swing energy conversion hydraulic device is connected to the transmission plate through a connecting rod mechanism.

7. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 6, characterized in that: The motion limiting column is a vertical cylinder with a smooth surface, and maintains an appropriate gap between the column and the center hole of the float, so as to limit the float from heaving and pitching along the motion limiting column.

8. The high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 7, characterized in that: The heave energy conversion hydraulic device comprises a heave hydraulic cylinder, a piston rod and a hydraulic pipeline; The bowing energy conversion hydraulic device comprises a bowing hydraulic cylinder, a rotary joint and a connecting rod mechanism; The hydraulic energy storage system is composed of a plurality of accumulators, which are respectively connected to the hydraulic pipelines of the heave swing and yaw swing energy conversion hydraulic devices; The power generation assembly includes a hydraulic motor and a generator. The hydraulic energy output by the hydraulic energy storage system drives the hydraulic motor to rotate, and the hydraulic motor drives the generator to generate electricity.

9. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 8, characterized in that: The supporting platform is a fixed platform or a floating platform.

10. A high-efficiency wave energy power generation device for multi-directional wave conditions according to claim 9, characterized in that: The upper structure of the float is made of carbon fiber reinforced composite material, and the lower structure of the float is made of aluminum alloy.

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