A bionic shell wave energy power generation device and its design method

Abstract

The present invention discloses a shell bionic wave energy power generation device, which comprises a plurality of power generation units arranged in sequence; each power generation unit includes a shell-shaped swing plate, a floating box body and a hydraulic power generation assembly; the shell-shaped swing plate is in a fan-shaped shell shape, the large-mouth end of the shell-shaped swing plate is hinged to the rear end of the floating box body; the small-mouth end of the shell-shaped swing plate faces the wave-facing surface; the top of the floating box body is connected to a hydraulic cylinder, and the piston rod of the hydraulic cylinder is hinged to the lower surface of the shell-shaped swing plate; the hydraulic power generation assembly is arranged in the floating box body, and the hydraulic power generation assembly includes a hydraulic motor and a generator; the output end of the hydraulic motor is connected to the input end of the generator. The present invention also discloses a design method for the shell bionic wave energy power generation device. The beneficial effects of the present invention are as follows: the shell-shaped swing plate is designed in a fan-shaped shell shape, drawing on the streamline curve of shellfish, having good hydrodynamic performance, being able to collect wave energy more efficiently, and improving the power generation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of utilization of marine renewable energy, and particularly relates to a shell bionic wave energy power generation device and a design method thereof. Background Art

[0002] As a clean energy source with great market prospects among many marine renewable energies, wave energy can generate electric energy through a wave energy conversion device after three - stage energy conversion. In the past nearly 20 years, the wave energy conversion device has been continuously improved at the technical level and has now entered the stage of market exploration and preliminary operation.

[0003] The existing wave energy conversion devices mainly include pendulum - type wave energy conversion devices, buoy - type devices, and oscillating water column devices, but each has some deficiencies. For example, the pendulum - type wave energy conversion device has a small wave - facing surface and low power generation efficiency; for the buoy - type device, the ability to resist extreme weather is weak, and typhoons or huge waves may cause the floating box body to capsize, so redundant design needs to be added; the oscillating water column device has a large noise and is likely to affect marine organisms. In addition, the existing wave energy conversion devices only have the power generation function and have a single application scenario. Summary of the Invention

[0004] The purpose of the present invention is to propose a shell bionic wave energy power generation device and a design method thereof, aiming at improving the power generation efficiency, in view of the deficiencies of the existing technology.

[0005] The technical solution adopted by the present invention is: a shell bionic wave energy power generation device, including a plurality of power generation units arranged in sequence; each power generation unit includes a shell - shaped swing plate, a floating box body, and a hydraulic power generation component;

[0006] The shell - shaped swing plate is arranged above the floating box body; the large - mouth end of the shell - shaped swing plate is hinged to the rear end of the floating box body; the small - mouth end of the shell - shaped swing plate faces the wave - facing surface;

[0007] The top of the floating box body is connected to a hydraulic cylinder, and the piston rod of the hydraulic cylinder is hinged to the lower surface of the shell - shaped swing plate. The small - mouth end of the shell - shaped swing plate swings up and down relative to the floating box body, and the piston rod of the hydraulic cylinder extends or contracts accordingly;

[0008] The hydraulic power generation component is arranged in the floating box body and includes a hydraulic motor and a generator; the hydraulic cylinder is a double - acting hydraulic cylinder. The rodless cavity of the hydraulic cylinder is communicated with an oil port of the hydraulic motor through a first oil path, another oil port of the hydraulic motor is communicated with an oil tank through a pipeline, and the oil tank is communicated with the rod - end cavity of the hydraulic cylinder through a second oil path; the output end of the hydraulic motor is connected to the input end of the generator, and the output end of the generator is connected to a storage battery;

[0009] The floating box bodies of two adjacent power generation units are fixedly connected.

[0010] According to the above solution, there is also a slider assembly in the floating box body. The slider assembly includes a servo motor, a lead screw, a slider and a base. The base is installed on the substrate inside the floating box body, and the length direction of the base is the same as the length direction of the floating box body. The servo motor is fixed at one end of the base. One end of the lead screw is connected to the servo motor, and the other end is supported on the other end of the base. The slider is installed on the slide rail provided on the base, and the slider is provided with a threaded hole that mates with the lead screw. When the servo motor rotates to drive the lead screw to rotate, the slider threadedly connected to the lead screw moves along the axial direction of the lead screw accordingly.

[0011] According to the above solution, an anchor chain is provided at the bottom of the floating box body, and the lower end of the anchor chain is fixed to the seabed.

[0012] According to the above solution, a flow dividing and collecting valve, an overflow valve and a throttle valve are arranged in sequence along the fluid flow direction on the first oil path. The first oil path is also provided with a flow meter and a pressure transmitter.

[0013] According to the above solution, a filter and a flow dividing and collecting valve are configured on the second oil path. The second oil path and the first oil path respectively pass through a one-way valve group to prevent fluid backflow.

[0014] According to the above solution, the drive shaft of the hydraulic motor is connected to a torque and speed meter through a coupling.

[0015] According to the above solution, accumulators are respectively configured on the first oil path and the second oil path.

[0016] According to the above solution, the shell bionic wave energy generation device further includes a single-chip microcomputer, which is connected to the flow meter, the pressure transmitter and the torque and speed meter through a circuit. The single-chip microcomputer receives the data detected in real time by the flow meter, the pressure transmitter and the torque and speed meter.

[0017] According to the above solution, the single-chip microcomputer is also connected to a gyroscope sensor and a servo motor. The gyroscope sensor is installed inside the floating box body, and it detects the pitch angle of the floating box body in real time and sends the real-time pitch angle information to the single-chip microcomputer. The single-chip microcomputer compares the real-time pitch angle of the floating box body with the set value of the pitch angle of the floating box body. If the real-time pitch angle is not within the set pitch angle range, the single-chip microcomputer controls the servo motor to drive the slider to move, changing the center of gravity of the floating box body until the gyroscope sensor detects that the real-time pitch angle of the floating box body is within the set pitch angle range.

[0018] The present invention also adopts a design method for a shell bionic wave energy generation device, and this method is as follows:

[0019] According to the working environment of the shell bionic wave energy generation device, obtain the wave characteristic values of the working environment;

[0020] According to the wave characteristic value, the relevant structural parameters of the shell-shaped pendulum are designed: the height H of the shell-shaped pendulum is taken as the variable parameter, the length and width of the shell-shaped pendulum are designed, and the inner surface profile of the shell-shaped pendulum is designed;

[0021] Calculate the impact load on the shell-shaped pendulum plate, and select the wave energy to electricity conversion method according to the magnitude and frequency of the impact load;

[0022] Construct a finite element model of a shell bionic wave energy power generation device, simulate the wave environment for numerical simulation, and calculate the hydrodynamic characteristics of the shell bionic wave energy power generation device under different values ​​of variable parameters, including power generation efficiency, maximum rotation angle and angular velocity of the shell-shaped pendulum plate;

[0023] The variable parameter values ​​corresponding to the maximum rotation angle and angular velocity that meet the design requirements and the maximum power generation efficiency are selected as the optimal values.

[0024] The beneficial effects of the present invention are:

[0025] 1. The present invention designs a shell-shaped swing plate, which draws on the streamlined curves of shellfish and has good fluid dynamics performance. Compared with traditional power generation devices, it can collect wave energy more efficiently, improve power generation efficiency, and also improve wave-blocking effect.

[0026] 2. The present invention sets a sliding assembly in the floating box, and adjusts the center of gravity of the power generation unit by adjusting the position of the slider. On the one hand, it effectively prevents the floating box from overturning, reduces shaking, reduces energy loss, and thus improves power generation efficiency; on the other hand, it can adapt to complex and changeable sea conditions and ensure stable operation of the device in different environments.

[0027] 3. The power generation units of the present invention are arranged in an array, which can replace the traditional breakwater. They can not only efficiently break waves, but also convert the absorbed wave energy into electrical energy, thus achieving diversified functions. They are especially suitable for deep-sea engineering projects, meeting the dual needs of wave breaking and power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0029] Figure 2 It is a schematic diagram of the power generation unit in the first embodiment.

[0030] Figure 3 It is a left view of the shell-shaped swing plate in the first embodiment.

[0031] Figure 4 It is a front view of the shell-shaped swing plate in the first embodiment.

[0032] Figure 5It is the top view of the shell-shaped swing plate in Embodiment 1.

[0033] Figure 6 It is the schematic diagram of the oil circuit connection of the hydraulic power generation component in Embodiment 1.

[0034] Figure 7 It is the schematic diagram of the slider component in Embodiment 1.

[0035] Figure 8 It is the schematic flow diagram of Embodiment 2.

[0036] Figure 9 In Embodiment 2 、 It is the schematic diagram of the Cassini oval at that time.

[0037] Wherein: 1. Shell-shaped swing plate; 11. Large mouth end; 12. Small mouth end; 13. Hinge plate; 2. Hydraulic cylinder; 21. Rod chamber; 22. Rodless chamber; 3. Floating box body; 4. Anchor chain; 5. Hydraulic power generation component; 51. Flow dividing and collecting valve; 52. Check valve group; 53. Accumulator; 54. Filter; 55. Relief valve; 56. Throttle valve; 57. Pressure transmitter; 58. Flowmeter; 59. Torque and speed meter; 510. Coupling; 511. Oil tank; 6. Hydraulic motor; 7. Generator; 8. Slider component; 81. Servo motor; 82. Slider; 83. Lead screw; 84. Base. Detailed implementation manners

[0038] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0039] Embodiment 1

[0040] In order to better understand the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] As Figure 1 shown, a shell bionic wave energy power generation device includes a plurality of power generation units arranged in sequence; as Figure 2 shown, each power generation unit includes a shell-shaped swing plate 1, a floating box body 3 and a hydraulic power generation component 5;

[0042] The shell-shaped swing plate 1 is arranged above the floating box body 3; the large mouth end 11 of the shell-shaped swing plate 1 is hinged to the rear end of the floating box body 3; the small mouth end 12 of the shell-shaped swing plate 1 faces the wave-facing surface;

[0043] The top of the floating box body 3 is connected to the hydraulic cylinder 2, and the piston rod of the hydraulic cylinder 2 is hinged to the lower surface of the shell-shaped swing plate 1 (it can be hinged to the middle of the lower surface of the shell-shaped swing plate 1), and the small mouth end 12 of the shell-shaped swing plate 1 can swing up and down relative to the floating box body 3, and the piston rod of the hydraulic cylinder 2 can extend or contract accordingly;

[0044] The hydraulic power generation assembly 5 is arranged inside the floating box body 3. The hydraulic power generation assembly 5 includes a hydraulic motor 6 and a generator 7. The hydraulic cylinder 2 is a double-acting hydraulic cylinder. The rodless cavity 22 of the hydraulic cylinder 2 is communicated with an oil port of the hydraulic motor 6 through a first oil path. The other oil port of the hydraulic motor 6 is communicated with an oil tank 511 through a pipeline. The oil tank 511 is communicated with the rod cavity 21 of the hydraulic cylinder 2 through a second oil path. The output end of the hydraulic motor 6 is connected to the input end of the generator 7, and the output end of the generator 7 is connected to a storage battery.

[0045] The floating box bodies 3 of two adjacent power generation units are fixedly connected by pins.

[0046] In the present invention, as Figures 3 - 5 shown, the shell-shaped swing plate 1 is a fan-shaped shell-shaped structure. The tip (the end with a smaller width) of the shell-shaped swing plate 1 is the small-mouth end 12, and the wide end (the end with a larger width) of the shell-shaped swing plate 1 is the large-mouth end 11. The large-mouth end 11 includes a hinge plate 13 for connecting with the floating box body 3, as Figure 5 shown. The floating box body 3 floats on the sea surface. The lower surface of the shell-shaped swing plate 1 is connected to the floating box body 3 through the piston rod of the hydraulic cylinder 2. When the shell-shaped swing plate 1 makes a reciprocating undulating motion under the action of waves, the piston rod of the hydraulic cylinder 2 extends or contracts accordingly. The liquid in the two cavities of the hydraulic cylinder 2 flows into the hydraulic power generation assembly 5 to drive the hydraulic motor 6, thereby converting the waves at each moment into hydraulic energy. The hydraulic motor 6 acts as a prime mover to drive the generator 7 to generate electricity (which can be a permanent magnet generator), and the electric energy can be stored in the storage battery, ultimately realizing the conversion from hydraulic energy to mechanical energy and then to electric energy.

[0047] In the present invention, the fan-shaped shell-shaped swing plate 1 is designed. The small-mouth end of the shell-shaped swing plate 1 faces the waves. When the waves come, they impact on the lower surface of the shell-shaped swing plate 1, driving the shell-shaped swing plate 1 to move periodically. The piston rod of the hydraulic cylinder 2 extends or contracts accordingly. Since the shell-shaped swing plate 1 has a larger wave-facing surface area than an ordinary swing plate, it has a stronger ability to collect wave energy, higher power generation efficiency, and better wave-damping effect.

[0048] Preferably, an anchor chain 4 is arranged at the bottom of the floating box body 3. During normal operation, the lower end of the anchor chain 4 is fixed to the seabed, and the floating box body 3 floats on the sea surface. When encountering extreme sea conditions (such as typhoon storm surges), the device is prone to damage. At this time, the anchor chain 4 pulls the floating box body 3 and the shell-shaped swing plate 1 below the water surface, and changes the center of gravity of the floating box body 3 through the slider assembly 8 described later, making the device tilt forward, and the power generation function is temporarily deactivated. In the present invention, the anchor chain 4 is configured to use an electric motor.

[0049] Preferably, as Figure 7As shown, there is also a slider assembly 8 inside the floating box body 3. The slider assembly 8 includes a servo motor 81, a lead screw 83, a slider 82, and a base 84. The base 84 is installed on the substrate inside the floating box body 3, and the length direction of the base 84 is the same as that of the floating box body 3. The servo motor 81 is fixed to one end of the base 84. One end of the lead screw 83 is connected to the servo motor 81, and the other end is supported on the other end of the base 84. The slider 82 is installed on the slide rail provided on the base 84, and the slider 82 is provided with a threaded hole (the slider 82 is threadedly connected to the lead screw 83) that cooperates with the lead screw 83. When the servo motor 81 rotates to drive the lead screw 83 to rotate, the slider 82 threadedly connected to the lead screw 83 moves along the axial direction of the lead screw 83 accordingly.

[0050] In the present invention, two sets of slider assemblies 8 can be designed. By changing the position of the slider 82 inside the floating box body 3, the center of gravity of the floating box body 3 is adjusted to ensure the stable floating of the floating box body 3 and maintain the highest power generation efficiency under different sea conditions.

[0051] Preferably, a flow dividing and collecting valve 51, a relief valve 55, and a throttle valve 56 are arranged in sequence along the fluid flow direction on the first oil circuit. The throttle valve 56 and the relief valve 55 act together to regulate the liquid flow rate and play a role in stabilizing the circuit. The first oil circuit is also provided with a flow meter 58 and a pressure transmitter 57, wherein the flow meter 58 and the pressure transmitter 57 are respectively used to monitor the oil flow rate and pressure of the hydraulic circuit in real time.

[0052] Preferably, a filter 54 and a flow dividing and collecting valve 51 are configured on the second oil circuit. The second oil circuit and the first oil circuit respectively pass through a check valve group 52, and the check valve group 52 is used to prevent fluid backflow. Preferably, the drive shaft of the hydraulic motor 6 is connected to a torque and speed meter 59 through a coupling 510 to detect the torque of the hydraulic motor 6 and obtain the working state of the hydraulic motor 6 in real time.

[0053] In the present invention, the oil circuit and related valves are designed as prior art and will not be elaborated here.

[0054] In the present invention, when the shell-shaped swing plate 1 drives the piston rod of the hydraulic cylinder 2 to shorten under the action of wave loads and compresses the rodless cavity 22 of the hydraulic cylinder 2, as Figure 6As shown in the figure, the hydraulic oil in the rodless cavity 22 flows out of the cavity and enters the first oil circuit. It successively passes through the flow dividing and collecting valve 51, check valve group 52, overflow valve 55, throttle valve 56, and pressure transmitter 57 on the first oil circuit. After being regulated by the flowmeter 58, it flows into the hydraulic motor 6, driving the hydraulic motor 6 to drive the generator 7 to rotate. The hydraulic oil in the hydraulic motor 6 enters the fuel tank 511 after being utilized; at the same time, the oil in the fuel tank 511 enters the second oil circuit. After filtering impurities through the filter 54, it flows into the rod cavity 21 of the hydraulic cylinder 2 through the check valve group 52 and the flow dividing and collecting valve 51 on the second oil circuit. When the shell-shaped swing plate 1 drives the piston rod of the hydraulic cylinder 2 to extend under the action of the wave load, the rod cavity 21 of the hydraulic cylinder 2 is compressed, and the hydraulic oil flows from the rod cavity 21 through the second oil circuit, hydraulic motor 6, and first oil circuit into the rodless cavity 22. At the same time, the hydraulic motor 6 drives the generator 7 to generate electricity.

[0055] In the present invention, accumulators 53 are respectively arranged on the first oil circuit and the second oil circuit. When the device is subjected to sudden loads, such as large waves and mechanical failures, the accumulators 53 can ensure the normal operation of the oil circuit; when the external load is large and the hydraulic energy of the oil circuit is too high, a part of the hydraulic oil can flow into the accumulators 53 to be neutralized; when there is a device failure such as jamming, the hydraulic oil in the accumulators 53 can automatically compensate the circuit.

[0056] In the present invention, the shell bionic wave energy generating device is also provided with a single-chip microcomputer. The single-chip microcomputer is connected to the flowmeter 58, pressure transmitter 57, and torque and speed meter 59 through circuits. The single-chip microcomputer receives the data detected by the flowmeter 58, pressure transmitter 57, and torque and speed meter 59 in real time; the single-chip microcomputer is also connected to a gyroscope sensor and a servo motor 81. The gyroscope sensor is installed in the floating box body 3 and is used to detect the attitude information of the floating box body 3. Specifically, it is used to detect the real-time pitch angle of the floating box body 3 and send the real-time pitch angle information to the single-chip microcomputer; the single-chip microcomputer compares the real-time pitch angle of the floating box body 3 with the set value of the pitch angle of the floating box body 3. If the detected real-time pitch angle is not within the set pitch angle range (the set value of the pitch angle is not greater than 10°), the single-chip microcomputer controls the servo motor 81 to drive the slider 82 to move, changing the center of gravity of the floating box body 3 until the gyroscope sensor detects that the real-time pitch angle of the floating box body 3 is within the set pitch angle range.

[0057] In the present invention, the working process of the shell bionic wave energy generating device includes:

[0058] (1) Wave energy capture (wave energy → mechanical energy): The wave energy power generation device is placed at sea level. The bottom of the floating box 3 is fixed by an anchor chain 4 and floats on the sea surface. The small end 12 of the shell-shaped swing plate 1 faces the oncoming waves directly. When the waves come, they hit the lower surface of the shell-shaped swing plate 1. The periodic undulating motion of the sea waves drives the small end of the shell-shaped swing plate 1 to reciprocate up and down around its large end, and accordingly drives the piston rod of the hydraulic cylinder 2 to reciprocate, converting the wave energy into the mechanical energy of the shell-shaped swing plate 1 and the piston rod of the hydraulic cylinder 2.

[0059] (2) Mechanical energy conversion (mechanical energy → hydraulic energy): When the piston rod of the hydraulic cylinder 2 moves downward, it compresses the hydraulic oil in the rodless cavity 22 of the hydraulic cylinder 2, and the mechanical energy of the piston rod is converted into the hydraulic energy of the hydraulic oil; the hydraulic oil in the rodless cavity 22 of the hydraulic cylinder 2 is transported through an oil circuit to the hydraulic motor 6 in the floating box 3; the same applies when the piston rod of the hydraulic cylinder 2 moves upward.

[0060] (3) Hydraulic energy power generation (hydraulic energy → electrical energy): The hydraulic motor 6 acts as a prime mover to drive the generator 7 to generate electricity. At this time, the hydraulic energy of the hydraulic oil is converted into electrical energy, which is then rectified by a rectifier circuit and stored in a storage battery. Then the hydraulic oil flows back to the cylinder block of the hydraulic cylinder 2 through a hydraulic circuit to complete a working cycle.

[0061] In the present invention, a rectifier circuit can also be configured. The current generated by the generator 7 is rectified by the rectifier circuit and then connected to the storage battery. The storage battery stores electricity and can supply power to the circuit to ensure the normal operation of the device.

[0062] In the present invention, the power generation units of the shell bionic wave energy power generation device can be combined and arranged in an array, surrounding the offshore engineering structure, and wave energy is captured and waves are dissipated while generating electricity.

[0063] Embodiment 2

[0064] In this embodiment, the shell bionic wave energy power generation device in Embodiment 1 is designed. Specifically, as Figure 8 shown, a design method of a shell bionic wave energy power generation device is as follows:

[0065] Step 1: According to the working environment of the shell bionic wave energy power generation device, obtain the wave characteristic values of the working environment.

[0066] In the present invention, the shell bionic wave energy power generation device can be used for wave power generation in nearshore or offshore areas. The wave characteristic values include the average wave height , the average period and the instantaneous velocity of the waves in the vertical direction .

[0067] The present invention adopts the average value method of partial large waves to obtain the statistical characteristic values of waves. The specific method is as follows: First, a series of wave data are collected, covering wave information under different times and different sea conditions. Then, these wave data are sorted in sequence according to the wave height, and the significant wave (one-third of the large waves) is used to represent the overall waves. The first one-third of the large waves are selected, and the average wave height of the first one-third of the large waves is calculated. and the average period , measure the instantaneous velocity of the wave in the vertical direction, which is used as the average wave height of the wave for subsequent calculations. , average period (determine the impact load frequency for determining the energy conversion method) and the instantaneous velocity of each point of the wave in the vertical direction. U .

[0068] Step 2: According to the wave characteristic values, design the relevant structural parameters of the shell-shaped swing plate 1: Take the height of the shell-shaped swing plate 1 as the variable parameter, design the length of the shell-shaped swing plate 1, the width of the shell-shaped swing plate 1, and at the same time design the inner surface profile (i.e., the inner surface contour) of the shell-shaped swing plate 1.

[0069] In the present invention, the larger the area of the shell-shaped swing plate 1, the more energy is captured, but it is limited by the wave force and the structural strength. Take the maximum length of the shell-shaped swing plate 1 as the length of the shell-shaped swing plate 1 (including the length of the aforementioned hinge plate 13, as Figure 5 shown), the maximum width of the shell-shaped swing plate 1 as the width of the shell-shaped swing plate 1 , and the distance between the small-mouth end 11 of the shell-shaped swing plate 1 and the upper surface of the floating box body as the height of the shell-shaped swing plate 1 . Take the height H of the shell-shaped swing plate 1 as the variable parameter, and according to the average wave height of the wave, determine the height of the shell-shaped swing plate 1 Figure 1 (as shown): In order to prevent the shell-shaped swing plate 1 from overtopping, the minimum value is taken as . The length L of the shell-shaped swing plate 1 is preferably such that no overtopping occurs when the position of the shell-shaped swing plate 1 is the lowest, and the value is ; the aspect ratio of the shell-shaped swing plate 1 is 2:1 to 5:1 to reduce the lateral flow resistance and avoid vortex-induced vibration.

[0070] In the present invention, the inner surface profile (i.e., the contour) of the shell-shaped swing plate 1 satisfies the Cassini oval equation:

[0071] ;

[0072] The coordinate system of the equation is established with the projection center of the small end of the conch-shaped swing plate 1 on the upper surface of the floating box body 3 as the origin. As shown in Figure 1 , the X direction is the horizontal direction, and the Y direction is the vertical direction; in the formula, x is the coordinate in the X direction, and y is the coordinate in the Y direction. And , both a and c are constants, and .

[0073] Step 3: Calculate the impact load frequency on the conch-shaped swing plate 1 and the impact load on the conch-shaped swing plate 1 according to the average period of the wave.

[0074] In the present invention, the average period of the wave is also the impact load period, and the impact load frequency on the conch-shaped swing plate 1 . The morison equation is used to calculate the impact load on the conch-shaped swing plate 1, which is composed of drag force and inertial force. The specific calculation formula is as follows:

[0075]

[0076] Among them, is the resistance coefficient, dimensionless; is the inertial force coefficient, dimensionless; is the sea water density, with the unit of kg / m³, and the value is 1025 kg / m³; is the upstream projection area of the conch-shaped swing plate 1, m2; is the drainage volume of the conch-shaped swing plate 1, m 3 ; is the instantaneous velocity of the fluid in the vertical direction, m / s.

[0077] In the present invention, the upstream projection area and the drainage volume of the conch-shaped swing plate 1 can both be obtained by existing methods according to the design dimensions of the conch-shaped swing plate 1.

[0078] Step 4: Select the wave energy-electric energy conversion path according to the impact load magnitude and frequency on the conch-shaped swing plate 1, and specifically use a hydraulic device.

[0079] The commonly used energy conversion methods of wave energy power generation devices include pneumatic type, hydraulic type, mechanical type, and magnetic type. The frequency of the wave is relatively low and there is no need for an accurate transmission ratio; the impact force of the wave is relatively large, and hydraulic transmission is suitable for heavy load conditions. Under the same power, the volume of the device is relatively small, and it can transmit a relatively large force and torque. Therefore, the present invention uses a hydraulic transmission device.

[0080] Step 5: Build a finite element model of the shell - bionic wave energy generation device, simulate the wave environment, conduct numerical simulation on the shell - bionic wave energy generation device, and calculate the hydrodynamic characteristics of the shell - bionic wave energy generation device under different values of variable parameters, including power generation efficiency, maximum rotation angle and angular velocity of the shell - shaped swing plate 1. The specific method is as follows:

[0081] a. Establish the model: Build finite element models of the shell - bionic wave energy generation device and the numerical wave flume respectively in DesignModeler.

[0082] b. Mesh generation: Conduct mesh generation on the model, encrypt the surface of the floating box 3 and near the free surface (to capture wave deformation), and ensure that the two sets of meshes are successfully imported into the Fluent software after superposition.

[0083] c. Set boundary conditions: Define the inlet of the numerical wave flume as a velocity inlet, the outlet as a pressure outlet, the upper and lower boundaries as walls; the outer - perimeter mesh of the shell - bionic wave energy generation device is overset.

[0084] d. Simulate the motion process of the shell - bionic wave energy generation device: Write a user - defined function (UDF) script to compile the virtual hinge point and virtual PTO system to simulate the motion process of the shell - bionic wave energy generation device.

[0085] e. Solution settings: Select a transient solver, second - order upwind scheme, linear interpolation scheme and Coupled method to ensure the stability and efficiency of the calculation model. In the present invention, the transient solver, second - order upwind scheme, linear interpolation scheme and Coupled method are all existing methods and will not be elaborated here.

[0086] f. Simulation calculation: Conduct simulation in ANSYS Fluent to solve the hydrodynamic characteristics of the shell - bionic wave energy generation device under different values of variable parameters, including power generation efficiency, maximum rotation angle and angular velocity of the shell - shaped swing plate 1.

[0087] Step 6: According to the simulation results, select the values of variable parameters corresponding to the maximum rotation angle and angular velocity meeting the design requirements and the maximum power generation efficiency as the optimal values, conduct scheme design, and thus obtain the optimal length and optimal width of the shell - shaped swing plate 1. Take the optimal length of the shell - shaped swing plate 1 as the length of the floating box, and take the optimal width of the shell - shaped swing plate 1 as the width of the floating box 3.

[0088] In the present invention, when the rotation angle or angular velocity of the shell-shaped swing plate 1 is too large, it will cause the shell-shaped swing plate 1 to be in an unfavorable stress state, and the rotation angle or angular velocity of the shell-shaped swing plate 1 should be avoided from being too large. Therefore, taking the state where the shell-shaped swing plate 1 is not stressed as the initial state, the maximum clockwise rotation angle shall not be greater than 20°, the maximum counterclockwise rotation angle shall not be greater than 40°, and the angular velocity shall be less than 6 rad / s.

[0089] In the design process of the present invention, it should be ensured that the hinge joint between the shell-shaped swing plate 1 and the floating box body 3 does not suffer from strength and stiffness failures.

[0090] Under different sea conditions, due to the errors between the simulation results and the actual results, when putting into actual production, the first few groups of schemes with the highest power generation efficiency can be selected for design according to the simulation results, and the optimal scheme can be selected for quantitative production through the analysis of the power generation efficiency under specific sea conditions.

[0091] In the present invention, the constants in the inner surface contour equation of the shell-shaped swing plate 1 can be optimized first. a, c The specific method is as follows: when the variable parameters take certain values, multiple sets of data are taken for a, c respectively. Similarly, with the power generation efficiency as the target parameter, the shell bionic wave energy power generation device is simulated and calculated, and the value of a, c when the power generation efficiency is the maximum is selected as the optimal value. As shown in Figure 8 , when ， , the Cassini oval is as shown in Figure 9 .

[0092] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0093] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A shell bionic wave energy power generation device, characterized in that: It comprises a plurality of power generation units arranged in sequence; each power generation unit comprises a shell-shaped swing plate, a floating box and a hydraulic power generation assembly; The shell-shaped swing plate is arranged above the floating box; the large end of the shell-shaped swing plate is hinged to the rear end of the floating box; the small end of the shell-shaped swing plate faces the wave-facing surface; The top of the floating box is connected to a hydraulic cylinder, the piston rod of the hydraulic cylinder is hinged to the lower surface of the shell-shaped swing plate, the small end of the shell-shaped swing plate swings up and down relative to the floating box, and the piston rod of the hydraulic cylinder extends or shortens accordingly; The hydraulic power generation assembly is arranged in the floating box, and the hydraulic power generation assembly includes a hydraulic motor and a generator; the hydraulic cylinder is a bidirectional hydraulic cylinder, the rodless chamber of the hydraulic cylinder is connected to an oil port of the hydraulic motor through a first oil circuit, the other oil port of the hydraulic motor is connected to the oil tank through a pipeline, and the oil tank is connected to the rod chamber of the hydraulic cylinder through a second oil circuit; the output end of the hydraulic motor is connected to the input end of the generator; The floating boxes of two adjacent power generation units are connected and fixed; There is also a slider assembly in the floating box, and the slider assembly includes a servo motor, a screw rod, a slider and a base; the base is installed on a substrate inside the floating box, and the length direction of the base is consistent with the length direction of the floating box; the servo motor is fixed to one end of the base; one end of the screw rod is connected to the servo motor, and the other end is supported on the other end of the base; the slider is installed on a slide rail arranged on the base, and the slider is provided with a threaded hole that cooperates with the screw rod; when the servo motor rotates to drive the screw rod to rotate, the slider threadedly connected to the screw rod moves along the axial direction of the screw rod.

2. The shell bionic wave energy power generation device according to claim 1, characterized in that: An anchor chain is arranged at the bottom of the floating box, and the lower end of the anchor chain is fixed to the seabed.

3. The shell bionic wave energy power generation device according to claim 1, characterized in that: The first oil circuit is provided with a flow dividing and collecting valve, a relief valve and a throttle valve in sequence along the fluid flow direction; the first oil circuit is also provided with a flow meter and a pressure transmitter.

4. The shell bionic wave energy power generation device according to claim 3, characterized in that: The second oil circuit is provided with a filter and a flow dividing and collecting valve; the second oil circuit and the first oil circuit respectively pass through a one-way valve group to prevent fluid backflow.

5. The shell bionic wave energy power generation device according to claim 4, characterized in that: The driving shaft of the hydraulic motor is connected to the torque tachometer through a coupling.

6. The shell bionic wave energy power generation device according to claim 5, characterized in that: Accumulators are disposed in the first oil passage and the second oil passage, respectively.

7. The shell bionic wave energy power generation device according to claim 6, characterized in that: The shell bionic wave energy power generation device is also provided with a single chip microcomputer, which is connected to the flow meter, pressure transmitter and torque tachometer through a circuit, and receives data detected in real time by the flow meter, pressure transmitter and torque tachometer.

8. The shell bionic wave energy power generation device according to claim 7, characterized in that: The single chip microcomputer is also connected to a gyro sensor and a servo motor. The gyro sensor is installed in the floating box to detect the pitch angle of the floating box in real time and send the real-time pitch angle information to the single chip microcomputer. The single chip microcomputer compares the real-time pitch angle of the floating box with the pitch angle setting value of the floating box. If the real-time pitch angle is not within the set pitch angle range, the single chip microcomputer controls the servo motor to drive the slider to move, changing the center of gravity of the floating box until the gyro sensor detects that the real-time pitch angle of the floating box is within the pitch angle setting value range.

9. A method for designing a shell bionic wave energy power generation device as claimed in any one of claims 1 to 8, characterized in that: The method is: According to the working environment of the shell bionic wave energy power generation device, wave characteristic values ​​of the working environment are obtained; According to the wave characteristic value, the relevant structural parameters of the shell-shaped pendulum are designed: the height H of the shell-shaped pendulum is taken as the variable parameter, the length and width of the shell-shaped pendulum are designed, and the inner surface profile of the shell-shaped pendulum is designed; Calculate the impact load on the shell-shaped pendulum plate, and select the wave energy to electricity conversion method according to the magnitude and frequency of the impact load; Construct a finite element model of a shell bionic wave energy power generation device, simulate the wave environment for numerical simulation, and calculate the hydrodynamic characteristics of the shell bionic wave energy power generation device under different values ​​of variable parameters, including power generation efficiency, maximum rotation angle and angular velocity of the shell-shaped pendulum plate; The variable parameter values ​​corresponding to the maximum rotation angle and angular velocity that meet the design requirements and the maximum power generation efficiency are selected as the optimal values.

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