Self-powered self-sensing magnetic liquid energy harvesting device

Abstract

The present application relates to the technical field of vibration energy collection, and discloses a self-powered self-sensing magnetic liquid energy collection device, which comprises a shell, a inner cylinder fixedly connected in the shell, a current component, a adjusting component and a magnetic liquid. The current component comprises a permanent magnet inertia mass block and a plurality of coils, the coils are arranged on the outer wall of the inner cylinder, the inner cylinder stores the magnetic liquid, the permanent magnet inertia mass block cuts the magnetic field of the coil to generate induced current when moving radially. The adjusting component comprises an adjusting piece and two permanent magnets, the adjusting piece is located in the inner cylinder and rotationally connected with the shell, the two permanent magnets are arranged at the two ends of the adjusting piece, the distance between the permanent magnet inertia mass block and the permanent magnet is adjusted by the adjusting piece, and repulsion exists between the permanent magnet inertia mass block and the permanent magnet. When the permanent magnet inertia mass block moves radially, the permanent magnet is pushed to generate induced current by the repulsion. The present application can realize resonance for different motion frequencies, is convenient to adjust, and improves the energy recovery efficiency of human body.

Description

Technical Field

[0001] This invention relates to the field of vibration energy harvesting technology, and in particular to a self-powered, self-sensing magnetic liquid energy harvesting device. Background Technology

[0002] Vibration energy harvesting can capture energy resources from the environment without consuming additional resources, relying on traditional energy sources, generating no waste or emitting harmful gases. It is an infinitely renewable green resource and can stably obtain energy from vibration sources to provide stable power output, with broad application prospects and development potential.

[0003] With social and economic development, the widespread adoption of smart wearable devices such as smartwatches and smart glasses has brought great convenience to people's lives. Meanwhile, the application of active implantable medical devices, such as cochlear implants and pacemakers, has improved treatment outcomes while reducing the frequency of treatments and complications. However, all devices require energy to function properly. Therefore, in the process of social and economic development, the main factor restricting the development of smart wearable devices and active implantable medical devices is inevitably the supply of energy.

[0004] Currently, vibration energy recovery systems are mainly classified into piezoelectric, electrostatic, electromagnetic, and magnetostrictive types according to their structure and principle. Most mainstream human energy recovery devices currently employ the piezoelectric method, utilizing the piezoelectric effect to deform a piezoelectric material, generating an electric charge and thus collecting energy. However, piezoelectric vibration energy recovery is significantly affected by the vibration frequency, performing well only within specific frequencies. It also has poor energy capture capabilities for minute vibration signals, exhibiting high frequency dependence and significant temperature sensitivity. Nevertheless, piezoelectric materials possess a fast response speed, rapidly generating an electric charge, thus offering significant advantages in sensing applications.

[0005] Magnetic fluids, also known as ferrofluids, are a type of smart nanomaterial. They typically consist of magnetic particles, surfactants, and a carrier fluid. These tiny magnetic particles, due to their magnetism, generate magnetic moments under an applied magnetic field, giving the entire magnetic fluid magnetic properties. Magnetic fluids possess advantages such as superparamagnetism, second-order buoyancy, and low damping. They can be controlled by an external magnetic field, confining them near the field to prevent splashing and leakage, effectively avoiding damage caused by solid-solid friction and extending the device's lifespan while providing lubrication. Simultaneously, the high permeability of magnetic fluids allows them to effectively absorb and conduct magnetic fields, improving magnetic field sensitivity and response intensity, resulting in higher efficiency and performance for the device.

[0006] Human movement generates a large amount of energy. Research and analysis of human movement have revealed that different types of movement have different frequencies and amplitudes. Currently available electromagnetic energy harvesters can only collect energy effectively at a specific frequency. When faced with a wide variety of movement scenarios, the frequency variation often results in poor energy harvesting performance.

[0007] Therefore, there is an urgent need for a self-powered and self-sensing magnetic liquid energy harvesting device to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a self-powered and self-sensing magnetic liquid energy harvesting device to solve the problems existing in the prior art.

[0009] To achieve the above objectives, the present invention provides the following solution: The present invention provides a self-powered, self-sensing magnetic liquid energy harvesting device, comprising:

[0010] An outer shell, wherein an inner cylinder is fixedly connected inside the outer shell;

[0011] The current component includes a permanent magnet inertial mass block and several coils. The coils are wound around the outer wall of the inner cylinder. The inner cylinder contains a magnetic liquid. The permanent magnet inertial mass block is suspended in the inner cylinder by the magnetic liquid and generates an induced current by cutting the magnetic field of the coil when it moves radially.

[0012] An adjustment assembly includes an adjustment component and two permanent magnet components. The adjustment component is located inside the inner cylinder and rotatably connected to the outer shell. The permanent magnet inertial mass block is sleeved on the adjustment component. The two permanent magnet components are respectively disposed at both ends of the adjustment component. The distance between the permanent magnet components and the permanent magnet inertial mass block is adjusted by the adjustment component. There is a repulsive force between the permanent magnet inertial mass block and the permanent magnet components. When the permanent magnet inertial mass block moves radially, the repulsive force drives the permanent magnet components to generate an induced current.

[0013] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device includes an adjusting component comprising a bidirectional threaded rod, a permanent magnet inertial mass block sleeved on the bidirectional threaded rod with a gap between it and the bidirectional threaded rod, the bottom end of the bidirectional threaded rod being rotatably connected to the bottom end of the inner shell, and a knob installed on the top end of the bidirectional threaded rod extending out of the top end of the outer shell. The bidirectional threaded rod is rotated by manually rotating the knob, and the two permanent magnets are respectively threaded to both ends of the bidirectional threaded rod and radially slidably connected to the inner cylinder.

[0014] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein the permanent magnet includes a stator housing, a stator housing is detachably connected to the stator housing, a cavity is formed in the stator housing, a piezoelectric ceramic ring and a first permanent magnet are disposed in the cavity, the piezoelectric ceramic ring is fixedly connected in the cavity, and the first permanent magnet is limited and slidably connected in the cavity, and is squeezed by repulsive force against the piezoelectric ceramic ring.

[0015] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein a plurality of sliders are fixedly connected circumferentially on the outer wall of the stator housing, and a plurality of sliding grooves are provided axially on the inner wall of the inner cylinder, and the sliders are slidably connected to the sliding grooves.

[0016] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein a plurality of limiting blocks are fixedly connected circumferentially on the outer wall of the stator shell, and a limiting groove is formed on the inner wall of the slider, and the limiting blocks are adapted to the limiting groove.

[0017] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein the permanent magnet inertial mass block includes a plurality of second permanent magnets, and a ferromagnetic steel pad is fixedly connected between each adjacent pair of second permanent magnets, and there is a repulsive force between each adjacent pair of second permanent magnets.

[0018] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein three grooves are provided axially on the outer wall of the inner cylinder, the two grooves at both ends are the same size and the size is smaller than the size of the groove in the middle, and a plurality of coils are respectively wound in the three grooves.

[0019] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein the outer shell includes a housing, and a top cover and a bottom cover are respectively provided at the top and bottom ends of the housing. The bottom end of the bidirectional threaded rod is rotatably connected to the top end of the bottom cover. A knob seat is fixedly connected to the top cover. The top end of the bidirectional threaded rod passes through the bottom cover and the knob seat in sequence. The knob is sleeved on the bidirectional threaded rod and is limitedly connected to the bidirectional threaded rod by a positioning pin. An adjusting cap is threadedly connected to the top end of the bidirectional threaded rod, and the bottom end of the adjusting cap abuts against the top end of the knob.

[0020] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein an axial texture is provided on the inner wall of the inner cylinder.

[0021] According to the present invention, a self-powered and self-sensing magnetic liquid energy harvesting device is provided, wherein the housing is provided with a plurality of vent holes.

[0022] Compared with the prior art, the present invention has the following advantages and technical effects:

[0023] This invention provides a self-powered, self-sensing magnetic liquid energy harvesting device. It utilizes a novel NES (Non-Energy System) that uses permanent magnets to form a permanent magnet spring structure, replacing the traditional springs that provide restoring force. By adjusting the distance between the two permanent magnet components, the stiffness of the energy harvesting device can be made to exhibit pure nonlinearity and weak nonlinearity according to a certain rule. This allows the device to achieve targeted energy transfer with the main structure. This transfer is characterized by high speed and unidirectional irreversibility. Simultaneously, the resonant frequency of the permanent magnet inertial mass block can be changed, enabling the device to cope with various motion states. Through human movement, the permanent magnet inertial mass block moves radially, generating an induced current by cutting the coil and pushing the permanent magnet components, improving energy harvesting efficiency. It is easy to adjust later, has a small size, high energy harvesting efficiency, and is easy to carry. This invention can achieve resonance for different motion frequencies, is easy to adjust, and improves the energy recovery efficiency of the human body. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of the data acquisition device of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the data acquisition device of the present invention;

[0027] Figure 3 This is a cross-sectional view of the data acquisition device of the present invention;

[0028] Figure 4 This is a schematic diagram of the stator housing base and the stator housing in an unconnected state according to the present invention;

[0029] Figure 5 This is a schematic diagram showing the connection state between the stator housing base and the stator housing according to the present invention;

[0030] Figure 6 This is a schematic diagram of the knob base structure of the present invention;

[0031] Figure 7 This is a schematic diagram of the internal structure of the inner cylinder of the present invention;

[0032] The components include: 1. Outer shell; 101. Housing; 102. Top cover; 103. Bottom cover; 2. Magnetic fluid; 3. Permanent magnet inertial mass block; 301. Second permanent magnet; 302. Ferromagnetic steel gasket; 4. Coil; 5. Inner cylinder; 6. Bidirectional threaded rod; 7. Knob; 8. Stator housing; 9. Stator housing; 10. Piezoelectric ceramic ring; 11. First permanent magnet; 12. Slider; 13. Slide groove; 14. Limiting block; 15. Limiting groove; 16. Groove; 17. Knob seat; 18. Positioning pin; 19. Adjusting cap; 20. Axial texture; 21. Vent. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Reference Figures 1-7 This invention provides a self-powered, self-sensing magnetic liquid energy harvesting device, comprising:

[0036] Outer shell 1, with an inner cylinder 5 fixedly connected inside;

[0037] The current component includes a permanent magnet inertial mass block 3 and several coils 4. The coils 4 are wound around the outer wall of the inner cylinder 5. The inner cylinder 5 contains a magnetic liquid 2. The permanent magnet inertial mass block 3 is suspended in the inner cylinder 5 by the magnetic liquid 2 and generates an induced current by cutting the magnetic field of the coils 4 when it moves radially.

[0038] The adjustment assembly includes an adjustment component and two permanent magnet components. The adjustment component is located inside the inner cylinder 5 and is rotatably connected to the outer shell 1. The permanent magnet inertial mass block 3 is sleeved on the adjustment component. The two permanent magnet components are respectively set at both ends of the adjustment component. The distance between the permanent magnet component and the permanent magnet inertial mass block 3 is adjusted by the adjustment component. There is a repulsive force between the permanent magnet inertial mass block 3 and the permanent magnet component. When the permanent magnet inertial mass block 3 moves radially, the repulsive force pushes the permanent magnet component to generate an induced current.

[0039] In one embodiment of the present invention, a novel NES is constructed using permanent magnet components to form a permanent magnet spring structure, replacing the traditional spring to provide restoring force. By adjusting the spacing between the permanent magnet components at both ends, the stiffness of the energy harvesting device can be made to exhibit pure nonlinearity and weak nonlinearity according to a certain rule. This allows the device to achieve targeted energy transfer with the main structure. This transfer is characterized by high speed and unidirectional (irreversible) characteristics. At the same time, the resonant frequency of the permanent magnet inertial mass block 3 can be changed, enabling the device to cope with various motion states. Through human movement, the permanent magnet inertial mass block 3 moves radially, generating an induced current by cutting the coil 4 and pushing the permanent magnet components, thereby improving energy harvesting efficiency. The device is easy to adjust later, has a small size, high energy harvesting efficiency, and is easy to carry.

[0040] As an optional implementation, the adjusting component includes a bidirectional threaded rod 6, a permanent magnet inertial mass block 3 is sleeved on the bidirectional threaded rod 6 with a gap between them, the bottom end of the bidirectional threaded rod 6 is rotatably connected to the bottom end inside the outer shell 1, and the top end of the bidirectional threaded rod 6 extends out of the top end of the outer shell 1 and is equipped with a knob 7. The bidirectional threaded rod 6 is rotated by manually rotating the knob 7. Two permanent magnets are respectively threaded to both ends of the bidirectional threaded rod 6 and are radially slidably connected to the inner cylinder 5.

[0041] In one embodiment of the present invention, the rotation of the knob 7 drives the bidirectional threaded rod 6 to rotate, thereby changing the spacing of the internal permanent magnets, simplifying operation and preventing dust from entering and causing wear on internal components. By changing the spacing between the permanent magnets at both ends and the inertial mass block 3 of the middle permanent magnet, the stiffness of the permanent magnet spring is changed, thereby changing the resonant frequency of the inertial mass block 3 of the permanent magnet. This allows the device to cope with various motion states such as walking, running, leg shaking, and rope skipping, maximizing energy harvesting efficiency.

[0042] As an optional implementation, the permanent magnet component includes a stator housing 8, a stator housing 9 detachably connected to the stator housing 8, a cavity opened in the stator housing 9, a piezoelectric ceramic ring 10 and a first permanent magnet 11 disposed in the cavity, the piezoelectric ceramic ring 10 being fixedly connected in the cavity, and the first permanent magnet 11 being limited and slidably connected in the cavity, and being squeezed by repulsive force against the piezoelectric ceramic ring 10.

[0043] In one embodiment of the present invention, when a human body moves, the permanent magnet inertial mass block 3 reciprocates within the device. According to Newton's third law, the first permanent magnet 11 experiences a reaction force, continuously pressing against the piezoelectric ceramic ring 10 in contact with it. This causes the piezoelectric ceramic ring 10 to generate an induced current in a regular manner. Simultaneously, the magnetic field within the coil 4 wound around the inner cylinder 5 also changes regularly with the movement of the permanent magnet inertial mass block 3, thereby generating induced AC. Based on the current waveforms in the piezoelectric ceramic ring 10 and the coil 4, the acceleration and frequency of the human body movement can be calculated. Based on the obtained results, the knob 7 can be rotated to the corresponding position. This dual-sensor design ensures the accuracy of the results, while also making operation more convenient and simpler, lowering the application threshold, saving adjustment time, and improving adjustment efficiency.

[0044] As an optional implementation, a number of sliders 12 are fixedly connected circumferentially on the outer side wall of the stator housing 8, and a number of sliding grooves 13 are provided axially on the inner side wall of the inner cylinder 5, with the sliders 12 and the sliding grooves 13 being slidably connected.

[0045] In one embodiment of the present invention, radial limiting sliding is achieved by sliding the slider 12 within the slide groove 13.

[0046] As an optional implementation, a number of limiting blocks 14 are fixedly connected circumferentially on the outer side wall of the stator housing 9, and a limiting groove 15 is opened on the inner wall of the slider 12, with the limiting blocks 14 and the limiting groove 15 being adapted to each other.

[0047] In one embodiment of the present invention, the stator housing 9 is first placed on the stator housing base 8. The stator housing 9 is manually rotated to screw the limiting block 14 on the stator housing 9 into the limiting groove 15. At this time, the stator housing 9 and the stator housing base 8 remain relatively stationary in the axial direction, thereby fixing them in the axial direction.

[0048] As an optional implementation, the permanent magnet inertial mass block 3 includes a plurality of second permanent magnets 301, and each pair of adjacent second permanent magnets 301 is fixedly connected with a ferromagnetic steel pad 302, and there is a repulsive force between each pair of adjacent second permanent magnets 301.

[0049] In one embodiment of the present invention, due to the repulsive force between the magnets, the attractive force between the second permanent magnet 301 and the ferromagnetic steel pad 302 is insufficient for fixation. Therefore, glue is used to fix them to make the connection more secure. In this structure, the second permanent magnet 301 and the ferromagnetic steel pad 302 have through holes of the same size in the center. The bidirectional threaded rod 6 passes through the through hole in the center. The two are connected by a radial levitation force generated by the magnetic liquid 2, so that the permanent magnet inertial mass block 3 is suspended on the guide rail. This avoids direct contact between the permanent magnet inertial mass block 3 and the bidirectional threaded rod 6, and lubrication can reduce wear and increase service life. The permanent magnet inertial mass block 3 serves as the magnetic source of the energy harvesting device. During the process of sliding on the bidirectional threaded rod 6, the magnetic field in the coil winding changes continuously, thereby generating an induced current.

[0050] As an optional implementation, three grooves 16 are provided on the outer wall of the inner cylinder 5 along the axial direction. The two grooves 16 at both ends are the same size and are smaller than the size of the groove 16 in the middle. Several coils 4 are wound in the three grooves 16 respectively.

[0051] In one embodiment of the present invention, three grooves 16 are provided along the axial direction on the outer wall of the inner cylinder 5, and the wound coil 4 leads out the wire end through the outer shell 1 for subsequent processing of induced current.

[0052] As an optional implementation, the outer casing 1 includes a housing 101, with a top cover 102 and a bottom cover 103 respectively provided at the top and bottom ends of the housing 101. The bottom end of the bidirectional threaded rod 6 is rotatably connected to the top end of the bottom cover 103. A knob seat 17 is fixedly connected to the top cover 102. The top end of the bidirectional threaded rod 6 passes through the bottom cover 103 and the knob seat 17 in sequence. The knob 7 is sleeved on the bidirectional threaded rod 6 and is limited to the bidirectional threaded rod 6 by a positioning pin 18. An adjusting cap 19 is threadedly connected to the top end of the bidirectional threaded rod 6, and the bottom end of the adjusting cap 19 abuts against the top end of the knob 7.

[0053] In one embodiment of the present invention, the outer shell 1 includes a top cover 102 and a bottom cover 103. The difference between the top cover 102 and the bottom cover 103 is that the hole in the center of the bottom cover 103 is a semi-closed hole, while the top cover 102 is a through hole. A sealing ring (not marked in the figure) is also provided between the top cover 102 and the knob seat 17 to ensure a seal and prevent leakage of magnetic liquid 2. At the same time, both the knob 7 and the knob seat 17 are made of resin material. The lower side of the knob 7 has a protrusion, and the outer side of the knob seat 17 has a groove. The two can cooperate with each other. The side of the knob 7 has a through hole, through which the positioning pin 18 connects the knob 7 to the bidirectional threaded rod 6. The knob 7 has an adjusting cap 19 and a nut. The damping force of the knob 7 can be changed by adjusting the pressure of the cap 19. Finally, the knob 7 can also be fixed by adjusting the cap 19.

[0054] As an optional implementation, an axial weave 20 is provided on the inner wall of the inner cylinder 5.

[0055] In one embodiment of the present invention, more magnetic liquid 2 can be attached by the axial texture 20.

[0056] As an optional implementation, the housing 101 is provided with a plurality of vent holes 21.

[0057] In one embodiment of the present invention, since the resistance in the coil 4 is unavoidable, current will be generated during the energy harvesting process. According to Ohm's law, the coil 4 will generate heat energy. The higher the temperature, the greater the resistance, and the lower the harvesting efficiency. Using the vent 21 for heat dissipation can effectively reduce the temperature of the coil 4, reach thermal equilibrium with the outside environment more quickly, improve the energy harvesting efficiency, and also save materials.

[0058] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0059] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A self-powered, self-sensing magnetic liquid energy harvesting device, characterized in that, include: The outer shell (1) has an inner cylinder (5) fixedly connected inside it; The current assembly includes a permanent magnet inertial mass block (3) and several coils (4), the coils (4) being wound around the outer wall of the inner cylinder (5), the inner cylinder (5) containing a magnetic liquid (2), the permanent magnet inertial mass block (3) being suspended in the inner cylinder (5) by the magnetic liquid (2), and generating an induced current by cutting the magnetic field of the coils (4) when moving radially; The adjustment assembly includes an adjustment component and two permanent magnet components. The adjustment component is located inside the inner cylinder (5) and is rotatably connected to the outer shell (1). The permanent magnet inertial mass block (3) is sleeved on the adjustment component. The two permanent magnet components are respectively disposed at both ends of the adjustment component. The distance between the permanent magnet component and the permanent magnet inertial mass block (3) is adjusted by the adjustment component. There is a repulsive force between the permanent magnet inertial mass block (3) and the permanent magnet component. When the permanent magnet inertial mass block (3) moves radially, the repulsive force pushes the permanent magnet component to generate an induced current. The adjusting component includes a bidirectional threaded rod (6), on which the permanent magnet inertial mass block (3) is sleeved, with a gap between it and the bidirectional threaded rod (6). The bottom end of the bidirectional threaded rod (6) is rotatably connected to the bottom end inside the outer shell (1), and the top end of the bidirectional threaded rod (6) extends out of the top end of the outer shell (1) and is fitted with a knob (7). By manually rotating the knob (7), the bidirectional threaded rod (6) is driven to rotate. The two permanent magnets are respectively threadedly connected to the bidirectional threaded rod (6). The threaded rod (6) is radially slidably connected to both ends of the inner cylinder (5); the permanent magnet includes a stator housing (8), a stator housing (9) is detachably connected inside the stator housing (8), a cavity is opened inside the stator housing (9), a piezoelectric ceramic ring (10) and a first permanent magnet (11) are arranged inside the cavity, the piezoelectric ceramic ring (10) is fixedly connected inside the cavity, and the first permanent magnet (11) is limited and slidably connected inside the cavity, and the piezoelectric ceramic ring (10) is squeezed by repulsion.

2. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The stator housing (8) has several sliders (12) fixedly connected circumferentially on its outer side wall, and the inner cylinder (5) has several grooves (13) axially opened on its inner side wall, and the sliders (12) are slidably connected to the grooves (13).

3. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 2, characterized in that: A number of limiting blocks (14) are fixedly connected to the outer side wall of the stator shell (9) along the circumferential direction. A limiting groove (15) is opened on the inner wall of the slider (12). The limiting blocks (14) are adapted to the limiting groove (15).

4. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The permanent magnet inertial mass block (3) includes several second permanent magnets (301), and each pair of adjacent second permanent magnets (301) is fixedly connected with a ferromagnetic steel pad (302), and there is a repulsive force between each pair of adjacent second permanent magnets (301).

5. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The inner cylinder (5) has three grooves (16) axially formed on its outer side wall. The two grooves (16) at both ends are the same size and smaller than the groove (16) in the middle. Several coils (4) are wound in the three grooves (16).

6. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The outer shell (1) includes a shell (101), and the top and bottom ends of the shell (101) are respectively provided with a top cover (102) and a bottom cover (103). The bottom end of the bidirectional threaded rod (6) is rotatably connected to the top end of the bottom cover (103). A knob seat (17) is fixedly connected to the top cover (102). The top end of the bidirectional threaded rod (6) passes through the bottom cover (103) and the knob seat (17) in sequence. The knob (7) is sleeved on the bidirectional threaded rod (6) and is limited to the bidirectional threaded rod (6) by a positioning pin (18). The top end of the bidirectional threaded rod (6) is threadedly connected to an adjusting cap (19). The bottom end of the adjusting cap (19) abuts against the top end of the knob (7).

7. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: An axial weave (20) is provided on the inner wall of the inner cylinder (5).

8. The self-powered, self-sensing magnetic liquid energy harvesting device according to claim 6, characterized in that: The housing (101) has several ventilation holes (21).

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