Ultralow-frequency inertia pendulum type wave energy power generation device based on magnetic array

Abstract

The invention discloses an ultralow-frequency inertia pendulum type wave energy power generation device based on a magnetic array, and belongs to the technical field of wave energy power generation. The device comprises a left bracket and a right bracket, wherein bearings for supporting a first shaft, a second shaft and a third shaft are mounted on the left bracket; two one-way bearings rotating in the same direction are arranged on the first shaft, and outer ring gears of the two one-way bearings are meshed with gears on the second shaft and the third shaft respectively; a swing rod is fixed on the second shaft and the third shaft; an inertia pendulum is mounted on the swing rod; permanent magnets are embedded in the second shaft and the third shaft, a permanent magnet array is correspondingly arranged on the right support, the inertia pendulum is located at the approximately horizontal initial position through balance of magnetic force and gravity, the quasi-zero rigidity characteristic is achieved, and the system starting threshold value is reduced; the first shaft is connected with the generator assembly. The device is compact in structure, can capture rolling and heaving energy at the same time, is suitable for space-limited scenes such as an ocean unmanned platform, and improves the wave energy conversion efficiency.

Description

Technical Field

[0001] This invention belongs to the field of wave energy power generation technology, and particularly relates to an ultra-low frequency inertial pendulum wave energy power generation device based on a magnetic array. Background Technology

[0002] Addressing the urgent need for long-term power supply for unmanned marine systems, built-in wave energy generators have become a research hotspot due to their ability to directly extract energy from the marine environment and extend the platform's self-sufficiency. However, the internal space of unmanned platforms is extremely limited, which requires the power generator to be compact, small in size, lightweight, and capable of stable and efficient operation in complex real-world sea conditions.

[0003] In existing technologies, inertial pendulum wave energy generation devices, as potential built-in solutions, mainly utilize the rolling motion of a floating body to drive the relative motion of an internal inertial pendulum, thereby driving a generator to produce electricity. However, such devices face the following significant technical bottlenecks when targeting the aforementioned miniaturization and integration applications: Firstly, in order to effectively respond to common ultra-low frequency wave excitation, traditional inertial pendulums need to rely on extremely large swing mass or extremely long swing arms to obtain sufficient inertial torque and gravitational restoring torque, which leads to a fundamental contradiction between the overall size and weight of the device and the compact internal space of the unmanned platform.

[0004] Secondly, in traditional designs, the inertial pendulum is usually suspended from a fixed axis of rotation, and its equilibrium position is determined by gravity, with an initial state of vertical hanging. This configuration mainly captures the yaw energy of the floating body, but hardly responds to heave motion, resulting in a single energy capture mode. In real sea conditions, energy is often distributed across multiple degrees of freedom, and this single mode leads to limited energy utilization under complex wave conditions and low power generation efficiency per unit volume. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by proposing an ultra-low frequency inertial pendulum wave energy generation device based on a magnetic array. Its core lies in employing a specifically arranged array of permanent magnets to ensure the initial stable position of the inertial pendulum is approximately horizontal, achieving quasi-zero stiffness. The pendulum exhibits extremely low motion stiffness near its equilibrium position, significantly reducing the system's start-up threshold and enabling the capture of ultra-low frequency wave energy with a compact structural size. Simultaneously, the pendulum's dynamic characteristics in its horizontal initial state allow it to effectively respond to the heave motion energy of the floating body, achieving simultaneous capture of roll and heave energy. This provides an innovative solution for the miniaturization and long-term power supply of unmanned marine platforms.

[0006] The specific technical solution of the ultra-low frequency inertial pendulum wave energy generation device based on magnetic array of the present invention is as follows: An ultra-low frequency inertial pendulum wave energy generation device based on a magnetic array includes a support structure, a transmission mechanism, and a power generation mechanism. The support structure includes a left support and a right support; The transmission mechanism includes a first shaft, a second shaft, and a third shaft that are interconnected. The first shaft is provided with a one-way transmission assembly, which is used to convert the bidirectional oscillation of the second and third shafts into the one-way rotation of the first shaft; A pendulum and an inertial pendulum are connected to the second and third axes; A permanent magnet is provided on the pendulum or the rotating component connected to it, and a permanent magnet array is correspondingly provided on the support structure. The pendulum is made approximately horizontal in the initial state by balancing magnetic force and gravity, and has quasi-zero stiffness characteristics near the equilibrium position. The power generation mechanism is connected to the first shaft and converts the unidirectional rotation of the first shaft into electrical energy.

[0007] Furthermore, the one-way transmission assembly includes a first one-way bearing and a second one-way bearing mounted on the first shaft, both rotating in the same direction; The outer ring of the first one-way bearing is fixed with a first gear, which meshes with a third gear fixed on the second shaft; The outer ring of the second one-way bearing is fixed with a second gear, which meshes with a fourth gear fixed on the third shaft.

[0008] Furthermore, the third gear meshes with the fourth gear to achieve synchronous reverse rotation of the second shaft and the third shaft.

[0009] Furthermore, the permanent magnets are disposed inside the second and third axes, and the permanent magnet array is disposed on the right support and arranged around the second and third axes respectively.

[0010] Furthermore, the permanent magnet array is composed of multiple permanent magnets with alternating polarities, forming a stable magnetic field distribution.

[0011] Furthermore, the inertial pendulum is detachably mounted on the pendulum rod.

[0012] Furthermore, the support structure is provided with multiple bearings for supporting the ends of the first shaft, the second shaft, and the third shaft.

[0013] Furthermore, the device is suitable for installation inside the interior space of unmanned marine vessels, buoys, or submersibles.

[0014] Furthermore, the inertial pendulum can oscillate under the action of the swaying and heaving of the waves, thereby achieving multi-degree-of-freedom wave energy capture.

[0015] The ultra-low frequency inertial pendulum wave energy generation device based on a magnetic array of the present invention has the following advantages: By integrating the inertial pendulum with the magnetic array, the present invention can achieve ultra-low frequency wave energy harvesting without increasing the pendulum length or weight, ensuring a small installation volume and meeting the requirements for installation within the effective space of marine unmanned systems. Moreover, through the balance of magnetic force and gravity, the initial state of the inertial pendulum is approximately horizontal, thereby simultaneously harvesting energy from both roll and heave degrees of freedom, increasing power output while achieving a compact design. Attached Figure Description

[0016] Figure 1 This is an isometric view of the present invention.

[0017] Figure 2 This is the left view of the present invention.

[0018] Figure 3 This is a top view of the present invention.

[0019] Figure 4 This is the right view of the present invention.

[0020] Figure 5 This is a diagram showing the arrangement of the permanent magnets in this invention.

[0021] In the diagram: 1. Left support, 2. Right support, 3. First bearing, 4. Second bearing, 5. Third bearing, 6. First shaft, 7. Second shaft, 8. Third shaft, 9. First one-way bearing, 10. Second one-way bearing, 11. First gear, 12. Second gear, 13. Third gear, 14. Fourth gear, 15. Pendulum, 16. Inertial pendulum, 17. First permanent magnet, 18. Second permanent magnet, 19. First permanent magnet array, 20. Second permanent magnet array, 21. Fourth bearing, 22. Fifth bearing, 23. First bearing housing, 24. Second bearing housing, 25. Generator assembly. Detailed Implementation

[0022] To better understand the purpose, structure, and function of this invention, the following detailed description of an ultra-low frequency inertial pendulum wave energy generation device based on a magnetic array, in conjunction with the accompanying drawings, is provided.

[0023] like Figures 1 to 5As shown, an ultra-low frequency inertial pendulum wave energy generation device based on a magnetic array according to the present invention includes a left support 1 and a right support 2, which are connected by screws; a first bearing 3, a second bearing 4, and a third bearing 5 are installed on the left support 1, respectively supporting one end of a first shaft 6, a second shaft 7, and a third shaft 8; a first one-way bearing 9 and a second one-way bearing 10 are installed on the first shaft 6, and the rotation directions of the two one-way bearings are set to be the same; a first gear 11 fixed to the outer ring of the first one-way bearing 9 meshes with a third gear 13 fixed to the second shaft 7, and a second gear 12 fixed to the outer ring of the second one-way bearing 10 meshes with a fourth gear 14 fixed to the third shaft 8, while the third gear 13 and the fourth gear 14 mesh simultaneously; a pendulum rod 15 is fixed to the second shaft 7 and the third shaft 8, and an inertial pendulum 16 is installed on the pendulum rod 15, which are connected by screws; square holes are provided in both the second shaft 7 and the third shaft 8. A first permanent magnet 17 is installed in the hole of shaft 7, and a second permanent magnet 18 is installed in the hole of the third shaft 8. The right support 2 has several square holes around the second shaft 7, in which a first permanent magnet array 19 is installed. The right support 2 has several square holes around the third shaft 8, in which a second permanent magnet array 20 is installed. Through calculation, the magnetic torque generated by the permanent magnet array is balanced with the gravitational torque of the inertial pendulum, that is, the initial state of the inertial pendulum 16 is approximately horizontal, and the motion stiffness is extremely small near the equilibrium position. The other end of the second shaft 7 is supported by a fourth bearing 21 installed on the right support 2. The fourth bearing 21 is pressed by a first bearing seat 23. The first bearing seat 23 and the right support 2 are fixedly connected by screws. The other end of the third shaft 8 is supported by a fifth bearing 22 installed on the right support 2. The fifth bearing 22 is pressed by a second bearing seat 24. The second bearing seat 24 and the right support 2 are fixedly connected by screws. The first shaft 6 is connected to the output shaft of the generator assembly 25.

[0024] The working principle of this invention is as follows: During operation, the device is installed inside an unmanned vessel or buoy. Under the action of waves, the buoy undergoes rolling or heaving motion, and the inertial pendulum 16 oscillates back and forth relative to the support, driving the second shaft 7 and the third shaft 8 to rotate. Through gear transmission and the action of one-way bearings, the bidirectional oscillation is converted into unidirectional continuous rotation of the first shaft 6, thereby driving the generator assembly 25 to generate electricity.

[0025] In this embodiment, the permanent magnet array uses neodymium iron boron permanent magnets arranged with alternating N and S poles. The magnetic field distribution has been optimized through simulation to ensure that the inertial pendulum is horizontally balanced and has minimal stiffness. The mass of the inertial pendulum can be adjusted according to the actual sea conditions, and the length of the pendulum rod can also be adapted to different installation spaces.

[0026] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A low-frequency inertial pendulum wave energy generation device based on a magnetic array, characterized in that, Including the support structure, transmission mechanism and power generation mechanism (25); The support structure includes a left support (1) and a right support (2); The transmission mechanism includes a first shaft (6), a second shaft (7), and a third shaft (8) that are connected to each other. The first shaft (6) is provided with a one-way transmission assembly for converting the bidirectional oscillation of the second shaft (7) and the third shaft (8) into the one-way rotation of the first shaft (6); A pendulum (15) and an inertial pendulum (16) are connected to the second axis (7) and the third axis (8); A permanent magnet is provided on the inertial pendulum (16) or on the rotating component connected to it, and a permanent magnet array is provided on the support structure accordingly. The balance between magnetic force and gravity makes the inertial pendulum (16) approximately horizontal in the initial state and has quasi-zero stiffness characteristics near the equilibrium position. The power generation mechanism (25) is connected to the first shaft (6) and converts the unidirectional rotation of the first shaft (6) into electrical energy.

2. The apparatus according to claim 1, characterized in that, The one-way transmission assembly includes a first one-way bearing (9) and a second one-way bearing (10) mounted on the first shaft (6), both rotating in the same direction; The outer ring of the first one-way bearing (9) is fixed with a first gear (11), which meshes with a third gear (13) fixed on the second shaft (7); The outer ring of the second one-way bearing (10) is fixed with a second gear (12), which meshes with a fourth gear (14) fixed on the third shaft (8).

3. The apparatus according to claim 2, characterized in that, The third gear (13) meshes with the fourth gear (14).

4. The apparatus according to claim 1, characterized in that, The permanent magnet includes a first permanent magnet (17) disposed inside the second axis (7) and a second permanent magnet (18) disposed inside the third axis (8). The permanent magnet array includes a first permanent magnet array (19) disposed on the right support (2) and arranged around the second axis (7), and a second permanent magnet array (20) arranged around the third axis (8).

5. The apparatus according to claim 1, characterized in that, The support structure is provided with multiple bearings for supporting the ends of the first shaft (6), the second shaft (7) and the third shaft (8).

6. The apparatus according to claim 5, characterized in that, The left bracket (1) is equipped with a first bearing (3) supporting one end of the first shaft (6), a second bearing (4) supporting one end of the second shaft (7), and a third bearing (5) supporting one end of the third shaft (8). The right bracket (2) is equipped with a fourth bearing (21) supporting the other end of the second shaft (7) and a fifth bearing (22) supporting the other end of the third shaft (8).

7. The apparatus according to claim 1, characterized in that, The inertial pendulum (16) is detachably mounted on the pendulum rod (15).

8. The apparatus according to claim 1, characterized in that, The device is suitable for installation inside the interior space of unmanned marine vessels, buoys, or submersibles.

9. The apparatus according to claim 1, characterized in that, The inertial pendulum (16) can swing under the action of the swaying and heaving of the waves.

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