A totally enclosed nonlinear four-stable-state built-in oscillator type wave energy power generation device

Abstract

A kind of totally enclosed nonlinear four-stable built-in oscillator type wave energy generation device, including top cover, closed shell and bottom cover being fixedly connected to form enclosed space, energy capture float is fixedly arranged on the outer surface of enclosed space, the energy capture float is used to increase the energy capture capacity of wave energy, and provide anti-overturning moment for wave energy generation device;A first support plate, a second support plate, a third support plate and a fourth support plate are fixedly arranged in the closed shell from top to bottom;A plurality of guide columns are fixedly arranged between the first support plate and the second support plate, and a built-in oscillator is arranged on the guide column, the built-in oscillator can slide up and down along the guide column, a tension spring is fixedly installed between the built-in oscillator and the first support plate, and the built-in oscillator is hinged to the inside of the closed shell by a plurality of power generation hydraulic cylinders.

Description

Technical fields:

[0001] This invention relates to a fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device. Background technology:

[0002] The ocean covers 71% of the Earth's surface, can widely receive energy from solar radiation, and stores abundant renewable energy sources. Ocean renewable energy takes the form of wave energy, thermal energy, and salinity gradient energy. Notably, wave energy has attracted widespread attention due to its advantages such as high energy density, large total reserves, and long operating time.

[0003] Existing wave energy power generation devices suffer from two main problems. First, their overall efficiency is low. The device can only exhibit good power generation performance when the frequency of the incident wave energy is close to the device's natural vibration frequency. However, actual waves have broadband excitation characteristics, and wave energy power generation devices generally capture a narrow bandwidth of wave energy, resulting in low power generation efficiency. Second, their reliability is poor. The key components of wave energy power generation devices are exposed to seawater for a long time. The high humidity and high salinity working environment makes the device more susceptible to damage during actual operation. At the same time, the changeable marine weather and extreme weather conditions reduce the reliability of wave energy power generation devices. Summary of the Invention:

[0004] This invention provides a fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device with a reasonable structural design. Based on the interaction of multiple functional components, it utilizes the nonlinear tetrastable characteristics between magnetic rings to increase the motion response of the built-in oscillator, thereby widening the energy capture range of the device and improving the overall power generation efficiency of the wave energy device. At the same time, all energy conversion elements are integrated inside the fully enclosed shell to isolate key components from seawater, improving the operational reliability of the device. An energy-capturing float is installed on the fully enclosed shell to optimize the wave energy capture capability. On the one hand, it increases the contact area between the device and the waves, and on the other hand, it provides anti-overturning moment, further enhancing the stability of the device. This effectively reduces the risk of the wave energy generation device overturning under extreme sea conditions and extreme weather, solving the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0006] A fully enclosed nonlinear four-steady built-in oscillator wave energy generation device includes a top cover, a closed shell, and a bottom cover that are fixedly connected to form a closed space. An energy-capturing float is fixedly provided on the outer surface of the closed space. The energy-capturing float is used to increase the energy capture capability of wave energy and provide anti-overturning moment for the wave energy generation device. A first support plate, a second support plate, a third support plate, and a fourth support plate are fixedly provided from top to bottom inside the closed shell.

[0007] Multiple guide columns are fixedly installed between the No. 1 support plate and the No. 2 support plate. An internal vibrator is installed on the guide column. The internal vibrator can slide up and down along the guide column. A tension spring is fixedly installed between the internal vibrator and the No. 1 support plate. The internal vibrator is hinged to the inside of the closed shell through multiple generator hydraulic cylinders.

[0008] A magnetic nonlinear tetrastable mechanism is fixedly installed on the No. 3 support plate. The magnetic nonlinear tetrastable mechanism includes a No. 1 outer magnetic ring, a No. 2 outer magnetic ring, a No. 3 outer magnetic ring, and an inner magnetic ring. The inner magnetic ring is fixedly connected to the built-in oscillator through a connecting rod so that the inner magnetic ring moves synchronously with the built-in oscillator.

[0009] A hydraulic power generation system is fixedly installed on the No. 4 support plate. The hydraulic power generation system is connected to the power generation hydraulic cylinder through pipelines.

[0010] The power generation hydraulic cylinder includes hydraulic cylinder No. 1, hydraulic cylinder No. 2, hydraulic cylinder No. 3, and hydraulic cylinder No. 4. The cylinder barrels and piston rods of hydraulic cylinder No. 1 and hydraulic cylinder No. 2 are respectively hinged to the upper part of the closed shell and the built-in oscillator. The cylinder barrels and piston rods of hydraulic cylinder No. 3 and hydraulic cylinder No. 4 are respectively hinged to the lower part of the closed shell and the built-in oscillator. All hydraulic cylinders are symmetrically arranged on both sides of the built-in oscillator and in the same plane, so that the hydraulic cylinders move with the relative displacement between the built-in oscillator and the closed shell.

[0011] The magnetic nonlinear four-stable mechanism includes a first nonlinear mechanism housing, a second nonlinear mechanism housing, a third nonlinear mechanism housing, a fourth nonlinear mechanism housing, and a fifth nonlinear mechanism housing that are fixedly connected. The second and fourth nonlinear mechanism housings separate the three outer magnetic rings by a certain distance to construct three segments of magnetic negative stiffness states, giving the system nonlinear four-stable characteristics. Each nonlinear mechanism housing has a cavity, and the first, second, and third outer magnetic rings are fixedly installed in the first, third, and fifth nonlinear mechanism housings, respectively. The inner and outer magnetic rings are coaxially mounted within the housing of the power generation mechanism. The outer diameter of the inner magnetic ring is smaller than the inner diameter of the outer magnetic ring. Both the inner and outer magnetic rings are magnetized axially, and their magnetic poles are in the same direction. This generates nonlinear stiffness between the inner and outer magnetic rings, resulting in four stable equilibrium positions and three unstable equilibrium positions for the inner magnetic ring when it moves between the outer magnetic rings. Its potential energy function has four potential wells and three potential barriers. When the external wave excitation energy exceeds the height of the potential barriers, the inner magnetic ring and the built-in oscillator will cross the potential barrier limitation and move between different stable equilibrium positions with large amplitude between the potential wells, thereby improving power generation efficiency.

[0012] The hydraulic power generation system includes a first check valve, a second check valve, a third check valve, a fourth check valve, a high-pressure accumulator, a low-pressure accumulator, a one-way throttle valve, an overflow valve, and a hydraulic motor, all interconnected by hydraulic pipelines. The hydraulic power generation system also includes a generator, which is fixedly connected to the hydraulic motor.

[0013] The rodless chambers of hydraulic cylinders No. 1 and No. 2 are connected by pipelines, and then sequentially connected to check valve No. 1, high-pressure accumulator, one-way throttle valve, hydraulic motor, low-pressure accumulator, check valve No. 2, and the rodless chambers of hydraulic cylinders No. 3 and No. 4. An overflow valve is connected between the high-pressure accumulator and the oil tank. The rodless chambers of hydraulic cylinders No. 3 and No. 4 are connected by pipelines, and then connected to the high-pressure accumulator by check valve No. 3. The low-pressure accumulator is connected to the rodless chambers of hydraulic cylinders No. 1 and No. 2 by check valve No. 4.

[0014] Anchor chains and anchors are installed on the outer surface of the bottom cover; the enclosed shell, top cover and bottom cover may be equipped with reinforcing ribs to improve the device's resistance to damage from extreme sea conditions. The energy-capturing float may be filled with low-density foamed materials such as insulating ester, which further enhances the stability of the device and can effectively reduce the risk of the device capsizing under extreme sea conditions.

[0015] This invention employs the aforementioned structure, integrating and controlling all energy conversion components through a closed shell. This avoids contact between key components and seawater, effectively solving problems such as biofouling and seawater corrosion of critical components, and improving the operational reliability of the device. By installing an energy-capturing float outside the closed shell, the contact area between the device and sea waves is increased, and an anti-overturning moment is provided, further enhancing the stability of the device and effectively reducing the risk of overturning under extreme sea conditions. By generating segmented negative stiffness between the inner and outer magnetic rings, the vibration system exhibits nonlinear tetrastable characteristics, which can effectively reduce the system's natural frequency, increase the motion response of the built-in oscillator, broaden the energy capture bandwidth of the device, and improve the power generation efficiency. The captured energy is converted into hydraulic energy by the built-in oscillator through a power generation hydraulic cylinder. This hydraulic energy is then used to drive a generator by rotating a hydraulic motor based on the pressure difference between the high-pressure and low-pressure accumulators in the hydraulic power generation circuit. This design offers advantages such as stable operation, high efficiency, safety, and practicality. Attached image description:

[0016] Figure 1 This is a schematic diagram of the working scenario of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the generator hydraulic cylinder, the built-in oscillator, and the magnetic nonlinear tetrastable mechanism of the present invention.

[0019] Figure 4 This is a schematic diagram of the built-in oscillator and magnetic nonlinear tetrastable mechanism of the present invention.

[0020] Figure 5 for Figure 4 The front view and its BB-direction sectional view.

[0021] Figure 6 This is a schematic diagram of the hydraulic power generation system of the present invention.

[0022] Figure 7 This is a schematic diagram of the potential energy function of the built-in oscillator system of the present invention.

[0023] Figure 8 This is a schematic diagram of the stiffness function of the built-in oscillator system of the present invention.

[0024] In the diagram, 1. Wave power generation device; 2. Anchor chain; 3. Anchor; 4. Top cover; 5. Support plate No. 1; 6. Power generation hydraulic cylinder; 601. Hydraulic cylinder No. 1; 602. Hydraulic cylinder No. 2; 603. Hydraulic cylinder No. 3; 604. Hydraulic cylinder No. 4; 7. Built-in vibrator; 8. Guide column; 9. Magnetic nonlinear four-steady-state mechanism; 901. Housing of nonlinear mechanism No. 1; 902. Housing of nonlinear mechanism No. 2; 903. Housing of nonlinear mechanism No. 3; 904. Housing of nonlinear mechanism No. 4; 905. Housing of nonlinear mechanism No. 5; 906. Outer magnetic ring No. 1; 907. Outer magnetic ring No. 2. 908. Outer magnetic ring No. 3; 909. Inner magnetic ring; 10. Hydraulic power generation system; 1001. Check valve No. 1; 1002. Check valve No. 2; 1003. Check valve No. 3; 1004. Check valve No. 4; 1005. High-pressure accumulator; 1006. Low-pressure accumulator; 1007. One-way throttle valve; 1008. Overflow valve; 1009. Hydraulic motor; 1010. Generator; 11. Bottom cover; 12. Support plate No. 4; 13. Support plate No. 3; 14. Energy capture float; 15. Support plate No. 2; 16. Enclosed shell; 17. Tension spring; 18. Connecting rod. Detailed implementation method:

[0025] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0026] like Figure 1-8As shown, a fully enclosed nonlinear four-steady built-in oscillator wave energy generation device mainly includes a top cover 4, a closed shell 16, and a bottom cover 11 that are fixedly connected to form a closed space. An energy-capturing float 14 is fixedly provided on the outer surface of the closed space. The energy-capturing float 14 is used to increase the energy capture capability of wave energy and provide anti-overturning moment for the wave energy generation device. A first support plate 5, a second support plate 15, a third support plate 13, and a fourth support plate 12 are fixedly provided from top to bottom inside the closed shell 16.

[0027] Multiple guide columns 8 are fixedly installed between the first support plate 5 and the second support plate 15. An internal vibrator 7 is provided on the guide column 8. The internal vibrator 7 can slide up and down along the guide column 8. A tension spring 17 is fixedly installed between the internal vibrator 7 and the first support plate 5. The internal vibrator 7 is hinged to the inside of the closed shell 16 through multiple power generation hydraulic cylinders.

[0028] A magnetic nonlinear tetrastable mechanism 9 is fixedly installed on the third support plate 13. The magnetic nonlinear tetrastable mechanism 9 includes a first outer magnetic ring 906, a second outer magnetic ring 907, a third outer magnetic ring 908, and an inner magnetic ring 909. The inner magnetic ring 909 is fixedly connected to the built-in oscillator 7 through a connecting rod so that the inner magnetic ring 909 moves synchronously with the built-in oscillator 7.

[0029] A hydraulic power generation system 10 is fixedly installed on the fourth support plate 12. The hydraulic power generation system 10 is connected to the power generation hydraulic cylinder through pipelines.

[0030] The power generation hydraulic cylinder includes hydraulic cylinder 601, hydraulic cylinder 602, hydraulic cylinder 603, and hydraulic cylinder 604. The cylinder barrels and piston rods of hydraulic cylinders 601 and 602 are respectively hinged to the upper part of the enclosed housing 16 and the built-in vibrator 7. The cylinder barrels and piston rods of hydraulic cylinders 603 and 604 are respectively hinged to the lower part of the enclosed housing 16 and the built-in vibrator 7. All hydraulic cylinders are symmetrically arranged on both sides of the built-in vibrator 7 and in the same plane, so that the hydraulic cylinders move with the relative displacement between the built-in vibrator 7 and the enclosed housing 16.

[0031] The magnetic nonlinear four-stable mechanism 9 includes a first nonlinear mechanism housing 901, a second nonlinear mechanism housing 902, a third nonlinear mechanism housing 903, a fourth nonlinear mechanism housing 904, and a fifth nonlinear mechanism housing 905 that are fixedly connected in a cooperative manner. The second nonlinear mechanism housing 902 and the fourth nonlinear mechanism housing 904 separate the three outer magnetic rings by a certain distance to construct three magnetic negative stiffness states, giving the system nonlinear four-stable characteristics. Each nonlinear mechanism housing is provided with a cavity, and the first outer magnetic ring 906, the second outer magnetic ring 907, and the third outer magnetic ring 908 are respectively fixedly installed on the first nonlinear mechanism housing 901 and the third nonlinear mechanism housing 905. 903, and the internal cavity of the housing 905 of the fifth nonlinear mechanism; the inner magnetic ring 909 is coaxially installed with the outer magnetic ring, the outer diameter of the inner magnetic ring 909 is smaller than the inner diameter of the outer magnetic ring, both the inner magnetic ring 909 and the outer magnetic ring are magnetized along the axial direction, and the magnetic poles of the inner magnetic ring 909 and the outer magnetic ring are in the same direction, so as to generate nonlinear stiffness between the inner magnetic ring 909 and the outer magnetic ring, so that when the inner magnetic ring moves in the middle of the outer magnetic ring, there are four stable equilibrium positions and three unstable equilibrium positions, and its potential energy function has four potential wells and three potential barriers. When the external wave excitation energy exceeds the height of the potential barrier, the inner magnetic ring and the built-in oscillator will cross the potential barrier limitation and move between different stable equilibrium positions with large amplitude between the potential wells, thereby improving the power generation efficiency.

[0032] The hydraulic power generation system includes a first check valve 1001, a second check valve 1002, a third check valve 1003, a fourth check valve 1004, a high-pressure accumulator 1005, a low-pressure accumulator 1006, a one-way throttle valve 1007, an overflow valve 1008, and a hydraulic motor 1009, all interconnected by hydraulic pipelines. The hydraulic power generation system also includes a generator 1010, which is fixedly connected to the hydraulic motor 1009.

[0033] The rodless chambers of hydraulic cylinder 601 and hydraulic cylinder 602 are connected by pipelines, and then sequentially connected to check valve 1001, high-pressure accumulator 1005, one-way throttle valve 1007, hydraulic motor 1009, low-pressure accumulator 1006, check valve 1002, and the rodless chambers of hydraulic cylinder 603 and hydraulic cylinder 604. An overflow valve 1008 is connected between the high-pressure accumulator 1005 and the oil tank. The rodless chambers of hydraulic cylinder 603 and hydraulic cylinder 604 are connected by pipelines, and a check valve 1003 is connected between them and the high-pressure accumulator 1005. A check valve 1004 is connected between the low-pressure accumulator 1006 and the rodless chambers of hydraulic cylinders 601 and 602.

[0034] Anchor chains 2 and anchors 3 are installed on the outer surface of the bottom cover 11; the enclosed shell 16, top cover 4 and bottom cover 11 may be provided with reinforcing ribs to improve the device's resistance to damage from extreme sea conditions; the energy-capturing float 14 may be filled with low-density foamed materials such as insulating ester to further enhance the stability of the device and effectively reduce the risk of the device capsizing under extreme sea conditions.

[0035] The working principle of a fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device in this embodiment of the invention is as follows: Based on the cooperative action of multiple functional components, the nonlinear tetrastable characteristics between magnetic rings are utilized to increase the motion response of the built-in oscillator, thereby widening the energy capture range of the device and improving the overall power generation efficiency of the wave energy device. Simultaneously, all energy conversion elements are integrated inside a fully enclosed shell to isolate key components from seawater, improving the operational reliability of the device. An energy-capturing float is installed on the fully enclosed shell to optimize the wave energy capture capability, increasing the contact area between the device and the waves on one hand, and providing anti-overturning moment on the other, further enhancing the stability of the device, thus achieving… This effectively reduces the risk of wave energy power generation devices capsizing under extreme sea conditions and weather. The inner and outer magnetic rings generate segmented negative stiffness, and the vibration system exhibits nonlinear four-steady-state characteristics, which effectively reduces the system's natural frequency, increases the motion response of the built-in oscillator, broadens the energy capture bandwidth, and improves the device's power generation efficiency. Under the action of the built-in oscillator, the captured energy is converted into hydraulic energy through the power generation hydraulic cylinder. This hydraulic energy is then further converted into hydraulic energy by the hydraulic motor rotating through the pressure difference between the high-pressure and low-pressure accumulators in the hydraulic power generation circuit, thereby driving the generator to generate electricity. The accumulator can effectively play a "peak shaving and valley filling" role, reducing internal pressure pulsations and ensuring more stable power output.

[0036] The overall design mainly includes a top cover 4, a closed shell 16, and a bottom cover 11 that are fixedly connected to form a closed space. An energy-capturing float 14 is fixedly installed on the outer surface of the closed space. The energy-capturing float 14 is used to increase the energy capture capability of wave energy and provide anti-overturning torque for the wave energy power generation device. Inside the closed shell 16, a first support plate 5, a second support plate 15, a third support plate 13, and a fourth support plate 12 are fixedly installed from top to bottom. Multiple guide columns 8 are fixedly installed between the first support plate 5 and the second support plate 15. An internal vibrator 7 is installed on the guide column 8, and the internal vibrator 7 can slide up and down along the guide column 8. Tension springs 17 are fixedly installed between the first support plates 5. The built-in oscillator 7 is hinged to the inside of the closed shell 16 through multiple power generation hydraulic cylinders. A magnetic nonlinear tetrastable mechanism 9 is fixedly installed on the third support plate 13. The magnetic nonlinear tetrastable mechanism 9 includes a first outer magnetic ring 906, a second outer magnetic ring 907, a third outer magnetic ring 908, and an inner magnetic ring 909. The inner magnetic ring 909 is fixedly connected to the built-in oscillator 7 through a connecting rod so that the inner magnetic ring 909 moves synchronously with the built-in oscillator 7. A hydraulic power generation system 10 is fixedly installed on the fourth support plate 12. The hydraulic power generation system 10 is connected to the power generation hydraulic cylinder through pipelines.

[0037] For structural components, reinforcing ribs can be provided inside the enclosed shell 16, top cover 4, and bottom cover 11 to improve the device's resistance to damage from extreme sea conditions. The energy-capturing float 14 can be filled with low-density foamed materials such as insulating ester. The energy-capturing float 14 can increase the energy capture capability of wave energy and provide anti-overturning torque for the device, further enhancing the stability of the device. It can effectively reduce the risk of the device overturning under extreme sea conditions and increase the service life of the wave energy power generation device 1.

[0038] The built-in vibrator 7 is mainly connected to the enclosed shell 16 through the tension spring 17 and the generator hydraulic cylinder. The tension spring 17 can transfer the wave energy captured by the energy-capturing float 14 and the enclosed shell 16 to the built-in vibrator 7. Under wave excitation, the built-in vibrator 7 can slide up and down along the guide column 8. Due to the different structural parameters such as vibration stiffness and mass between the enclosed shell 16 and the built-in vibrator 7, a relative displacement will occur between them. If an upward relative displacement occurs between the built-in vibrator 7 and the enclosed shell 16, the four hydraulic cylinders swing upward, and the first and second hydraulic cylinders press oil into the hydraulic circuit, while the third and fourth hydraulic cylinders draw oil from the hydraulic circuit. If a downward relative displacement occurs between the built-in vibrator 7 and the enclosed shell 16, the generator hydraulic cylinder operates in the opposite manner.

[0039] For a magnetically nonlinear four-stable mechanism, there are five nonlinear mechanism housings 901, 902, 903, 904, and 905 that are fixedly connected. The second and fourth nonlinear mechanism housings 902 and 904 separate the three outer magnetic rings by a certain distance to construct three segments of magnetic negative stiffness, giving the system nonlinear four-stable characteristics. Each nonlinear mechanism housing has a cavity. The first outer magnetic ring 906, the second outer magnetic ring 907, and the third outer magnetic ring 908 are respectively fixedly installed in the internal cavities of the first nonlinear mechanism housing 901, the third nonlinear mechanism housing 903, and the fifth nonlinear mechanism housing 905; the inner magnetic ring 909 is coaxially installed with the outer magnetic rings; the inner magnetic ring 909 is fixedly connected to the built-in oscillator 7 through a connecting rod so that the inner magnetic ring 909 moves synchronously with the built-in oscillator 7; since the magnetic poles of the three outer magnetic rings are aligned with those of the inner magnetic ring 909, both the inner magnetic ring 909 and the outer magnetic rings are magnetized axially.

[0040] Furthermore, when relative motion occurs between the inner magnetic ring 909 and the outer magnetic ring, they are mainly subjected to repulsive nonlinear restoring forces. The nonlinear restoring force provided by the magnetic nonlinear quadstable mechanism 9 enables the built-in oscillator 7 to exhibit three segments of negative stiffness characteristics during vibration and form four stable equilibrium positions. Correspondingly, four potential wells will appear in the system potential energy function. When the external wave excitation energy exceeds the system's potential barrier, the inner magnetic ring and the built-in oscillator will cross the potential barrier limitation and perform large-amplitude inter-well periodic motion between different stable equilibrium positions to improve the energy capture effect of the device.

[0041] For the hydraulic power generation system, the rodless chambers of hydraulic cylinder 601 and hydraulic cylinder 602 are connected by a pipeline, and then sequentially connected to one-way valve 1001, high-pressure accumulator 1005, one-way throttle valve 1007, hydraulic motor 1009, low-pressure accumulator 1006, one-way valve 1002, and the rodless chambers of hydraulic cylinder 603 and hydraulic cylinder 604. An overflow valve 1008 connects the high-pressure accumulator 1005 to the oil tank. The rodless chambers of hydraulic cylinder 603 and hydraulic cylinder 604 are connected by a pipeline, and then connected to the high-pressure accumulator 1009. A third check valve 1003 is connected between 005 and the rodless chamber of the low-pressure accumulator 1006, the first hydraulic cylinder 601, and the second hydraulic cylinder 602 are connected by a fourth check valve 1004. The built-in oscillator 7 drives the generator hydraulic cylinder to move, storing hydraulic oil in the high-pressure accumulator 1005 and the low-pressure accumulator 1006. When the accumulator pressure reaches the set threshold, the hydraulic oil is released, and the hydraulic motor 1009 is driven to rotate through the pressure difference between the high-pressure accumulator 1005 and the low-pressure accumulator 1006, which in turn drives the generator 1010 to generate electricity, making the power output more stable.

[0042] In actual operation, the wave energy generator 1 floats on the sea surface. Under the excitation of waves and the constraint of anchor 3 and anchor chain 2, the energy-capturing float 14 and the closed shell 16 generate heaving motion, converting wave energy into mechanical energy. Part of the mechanical energy is transmitted to the built-in oscillator 7 through the tension spring 17. The built-in oscillator 7 also generates heaving motion under the excitation of inertial force. Due to the different vibration structure parameters, the closed shell 16 and the built-in oscillator 7 will generate relative displacement, thereby driving the power generation hydraulic cylinder to swing.

[0043] The generator hydraulic cylinder can swing upwards and downwards. When the generator hydraulic cylinder swings upwards, hydraulic oil flows from the rodless chambers of hydraulic cylinders 1 and 2 through check valve 1 and check valve 1 to the hydraulic motor. The hydraulic motor drives the generator to generate electricity. Furthermore, hydraulic oil flows out of the hydraulic motor and into the rodless chambers of hydraulic cylinders 3 and 4 through check valve 2. When the generator hydraulic cylinder swings downwards, hydraulic oil flows from the rodless chambers of hydraulic cylinders 3 and 4 through check valve 3 and check valve 1 to the hydraulic motor. The hydraulic motor drives the generator to generate electricity. Furthermore, hydraulic oil flows out of the hydraulic motor and into the rodless chambers of hydraulic cylinders 1 and 2 through check valve 4.

[0044] It should be noted that during the movement of the built-in oscillator 7, the magnetic nonlinear quadrature mechanism 9 can cause the built-in oscillator 7 to undergo large-amplitude inter-well movement between four different steady-state points, thereby increasing the displacement of the built-in oscillator 7, widening the wave energy capture bandwidth, and improving the overall power generation efficiency of the whole wave energy power generation device.

[0045] In summary, the fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device in this embodiment of the invention utilizes the synergistic effect of multiple functional components. By leveraging the nonlinear tetrastable characteristics between magnetic rings, the motion response of the built-in oscillator is increased, thereby widening the energy capture range and improving the overall power generation efficiency of the wave energy device. Simultaneously, integrating all energy conversion elements within a fully enclosed shell isolates key components from seawater, enhancing the device's operational reliability. Installing an energy-capturing float on the fully enclosed shell optimizes wave energy capture capabilities, increasing the contact area between the device and waves and providing anti-overturning moment, further enhancing the device's stability and thus effectively... This reduces the risk of wave energy power generation devices capsizing under extreme sea conditions and weather. The inner and outer magnetic rings generate segmented negative stiffness, and the vibration system exhibits nonlinear four-steady-state characteristics, effectively reducing the system's natural frequency, increasing the motion response of the built-in oscillator, widening the energy capture bandwidth, and improving the device's power generation efficiency. Under the action of the built-in oscillator, the captured energy is converted into hydraulic energy through a hydraulic cylinder. This hydraulic energy is then further converted into hydraulic energy by rotating a hydraulic motor based on the pressure difference between the high-pressure and low-pressure accumulators in the hydraulic power generation circuit, thereby driving the generator to generate electricity. The accumulator can effectively play a "peak shaving and valley filling" role, reducing internal pressure pulsations and ensuring more stable power output.

[0046] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0047] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device, characterized in that: It includes a top cover, a closed shell, and a bottom cover that are fixedly connected to form a closed space. An energy-capturing float is fixedly provided on the outer surface of the closed space. The energy-capturing float is used to increase the energy capture capability of wave energy and provide anti-overturning torque for the wave energy power generation device. A first support plate, a second support plate, a third support plate, and a fourth support plate are fixedly provided from top to bottom inside the closed shell. Multiple guide columns are fixedly installed between the No. 1 support plate and the No. 2 support plate. An internal vibrator is installed on the guide column. The internal vibrator can slide up and down along the guide column. A tension spring is fixedly installed between the internal vibrator and the No. 1 support plate. The internal vibrator is hinged to the inside of the closed shell through multiple generator hydraulic cylinders. A magnetic nonlinear tetrastable mechanism is fixedly installed on the No. 3 support plate. The magnetic nonlinear tetrastable mechanism includes a No. 1 outer magnetic ring, a No. 2 outer magnetic ring, a No. 3 outer magnetic ring, and an inner magnetic ring. The inner magnetic ring is fixedly connected to the built-in oscillator through a connecting rod so that the inner magnetic ring moves synchronously with the built-in oscillator. A hydraulic power generation system is fixedly installed on the No. 4 support plate. The hydraulic power generation system is connected to the power generation hydraulic cylinder through pipelines. The magnetic nonlinear four-stable mechanism includes a first nonlinear mechanism housing, a second nonlinear mechanism housing, a third nonlinear mechanism housing, a fourth nonlinear mechanism housing, and a fifth nonlinear mechanism housing that are fixedly connected. The second and fourth nonlinear mechanism housings separate the three outer magnetic rings by a certain distance to construct three segments of magnetic negative stiffness states, giving the system nonlinear four-stable characteristics. Each nonlinear mechanism housing has a cavity, and the first, second, and third outer magnetic rings are fixedly installed in the first, third, and fifth nonlinear mechanism housings, respectively. The inner and outer magnetic rings are coaxially mounted within the housing of the power generation mechanism. The outer diameter of the inner magnetic ring is smaller than the inner diameter of the outer magnetic ring. Both the inner and outer magnetic rings are magnetized axially, and their magnetic poles are in the same direction. This generates nonlinear stiffness between the inner and outer magnetic rings, resulting in four stable equilibrium positions and three unstable equilibrium positions for the inner magnetic ring when it moves between the outer magnetic rings. Its potential energy function has four potential wells and three potential barriers. When the external wave excitation energy exceeds the height of the potential barriers, the inner magnetic ring and the built-in oscillator will cross the potential barrier limitation and move between different stable equilibrium positions with large amplitude between the potential wells, thereby improving power generation efficiency.

2. The fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device according to claim 1, characterized in that: The power generation hydraulic cylinder includes hydraulic cylinder No. 1, hydraulic cylinder No. 2, hydraulic cylinder No. 3, and hydraulic cylinder No.

4. The cylinder barrels and piston rods of hydraulic cylinder No. 1 and hydraulic cylinder No. 2 are respectively hinged to the upper part of the closed shell and the built-in oscillator. The cylinder barrels and piston rods of hydraulic cylinder No. 3 and hydraulic cylinder No. 4 are respectively hinged to the lower part of the closed shell and the built-in oscillator. All hydraulic cylinders are symmetrically arranged on both sides of the built-in oscillator and in the same plane, so that the hydraulic cylinders move with the relative displacement between the built-in oscillator and the closed shell.

3. The fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device according to claim 1, characterized in that: The hydraulic power generation system includes a first check valve, a second check valve, a third check valve, a fourth check valve, a high-pressure accumulator, a low-pressure accumulator, a one-way throttle valve, an overflow valve, and a hydraulic motor, all interconnected by hydraulic pipelines. The hydraulic power generation system also includes a generator, which is fixedly connected to the hydraulic motor. The rodless chambers of hydraulic cylinders No. 1 and No. 2 are connected by pipelines, and then sequentially connected to check valve No. 1, high-pressure accumulator, one-way throttle valve, hydraulic motor, low-pressure accumulator, check valve No. 2, and the rodless chambers of hydraulic cylinders No. 3 and No.

4. An overflow valve is connected between the high-pressure accumulator and the oil tank. The rodless chambers of hydraulic cylinders No. 3 and No. 4 are connected by pipelines, and then connected to the high-pressure accumulator by check valve No.

3. The low-pressure accumulator is connected to the rodless chambers of hydraulic cylinders No. 1 and No. 2 by check valve No.

4.

4. The fully enclosed nonlinear tetrastable built-in oscillator wave energy generation device according to claim 1, characterized in that: Anchor chains and anchors are installed on the outer surface of the bottom cover; the enclosed shell, top cover and bottom cover may be equipped with reinforcing ribs to improve the device's resistance to damage from extreme sea conditions. The energy-capturing float may be filled with low-density foamed materials such as insulating ester, which further enhances the stability of the device and can effectively reduce the risk of the device capsizing under extreme sea conditions.

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