Self-energized-self-sensing magnetic liquid energy collection device

Abstract

The invention relates to the technical field of vibration energy collection, and discloses a self-energizing-self-sensing magnetic liquid energy collection device which comprises a shell, and an inner cylinder is fixedly connected in the shell; the current assembly comprises a permanent magnet inertia mass block and a plurality of coils, the coils are wound on the outer wall of the inner cylinder, magnetic liquid is stored in the inner cylinder, and the permanent magnet inertia mass block cuts a magnetic field of the coils during radial movement to generate induced current; the adjusting assembly comprises an adjusting part and two permanent magnet parts, the adjusting part is located in the inner cylinder and rotationally connected with the shell, the two permanent magnet parts are arranged at the two ends of the adjusting part respectively, the distance between the permanent magnet parts and the permanent magnet inertia mass block is adjusted through the adjusting part, and repulsive force exists between the permanent magnet inertia mass block and the permanent magnet parts; when the permanent magnet inertia mass block moves in the radial direction, the permanent magnet pieces are pushed through repulsive force to generate induced current. Resonance can be achieved for different motion frequencies, adjustment is convenient, and the energy recovery efficiency of the human body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vibration energy harvesting, and particularly to a self-powered and self-sensing magnetic liquid energy harvesting device. Background Art

[0002] Vibration energy harvesting can capture energy resources from the environment, without consuming additional resources, without relying on traditional energy sources, without generating waste or emitting harmful gases. It belongs to an infinitely renewable green resource, and can stably obtain energy from vibration sources to provide stable power output, having broad application prospects and development potential.

[0003] With the development of society and economy, the popularization of smart wearable devices such as smart watches and smart glasses has brought great convenience to people's lives. At the same time, the application of active implantable medical devices such as cochlear implants and cardiac pacemakers has improved the treatment effect while reducing the frequency of patients' need for frequent treatment and reducing complications. However, the normal operation of all devices is inseparable from energy. In the process of social and economic development, the main factor restricting the development of smart wearable devices and active implantable medical devices must be the energy supply.

[0004] Currently, vibration energy recovery systems are mainly divided into piezoelectric, electrostatic, electromagnetic, and magnetostrictive types according to their structures and principles; currently, the mainstream human energy recovery devices all adopt the piezoelectric type, that is, using the piezoelectric effect, applying vibration to the piezoelectric material, and the piezoelectric material deforms to generate charges to collect energy. However, piezoelectric vibration energy recovery is greatly affected by the vibration frequency, only performs well within a specific frequency range, has poor energy capture for tiny vibration signals, has a high dependence on frequency, and is also highly affected by temperature. However, piezoelectric materials have a fast response speed and can quickly generate charges, so piezoelectric materials have high advantages in sensing.

[0005] Magnetic liquid, also known as ferrofluid, is a kind of intelligent nanomaterial. Magnetic liquid is usually composed of magnetic particles, surfactants, and base carrier liquids. These tiny magnetic particles have magnetic properties and will generate magnetic moments under an external magnetic field, making the entire magnetic liquid exhibit magnetic properties. Magnetic liquid has advantages such as superparamagnetism, second-order buoyancy, and low damping; magnetic liquid can be controlled by an external magnetic field, making it be confined near the magnetic field, avoiding the splashing and leakage of lubricating liquid, effectively avoiding device damage caused by solid-solid friction, and being able to improve the service life of the device while lubricating. At the same time, the high magnetic permeability of magnetic liquid enables it to effectively absorb and conduct magnetic fields, improving the magnetic field sensitivity and response intensity, making the device have higher efficiency and performance.

[0006] When the human body is in motion, a large amount of energy is generated. Through the research and analysis of human motion, it is found that for different motion modes, their frequencies and amplitudes vary greatly. Currently, the existing electromagnetic energy harvesters can only collect energy effectively for a specific frequency. Facing a wide variety of motion scenarios, the change in frequency often leads to poor energy collection effect.

[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 the present invention is to provide a self-powered and self-sensing magnetic liquid energy harvesting device to solve the problems existing in the above-mentioned prior art.

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

[0010] A housing, inside which an inner cylinder is fixedly connected;

[0011] A current component, including a permanent magnet inertial mass and a plurality of coils. The coils are wound around the outer wall of the inner cylinder. Magnetic liquid is stored in the inner cylinder. The permanent magnet inertial mass is suspended in the inner cylinder through the magnetic liquid and generates an induced current by cutting the magnetic field of the coils during radial movement.

[0012] An adjusting component, including an adjusting member and two permanent magnetic members. The adjusting member is located inside the inner cylinder and is rotationally connected to the housing. The permanent magnet inertial mass is sleeved on the adjusting member. The two permanent magnetic members are respectively arranged at both ends of the adjusting member. The distance between the permanent magnetic member and the permanent magnet inertial mass is adjusted through the adjusting member. There is a repulsive force between the permanent magnet inertial mass and the permanent magnetic member. When the permanent magnet inertial mass moves radially, an induced current is generated by pushing the permanent magnetic member through the repulsive force.

[0013] According to a self-powered and self-sensing magnetic liquid energy harvesting device provided by the present invention, the adjusting member includes a bidirectional threaded rod. The permanent magnet inertial mass is sleeved on the bidirectional threaded rod and there is a gap between the permanent magnet inertial mass and the bidirectional threaded rod. The bottom end of the bidirectional threaded rod is rotationally connected to the bottom inside of the housing. The top end of the bidirectional threaded rod extends out of the top of the housing and is installed with a knob. By manually rotating the knob to drive the bidirectional threaded rod to rotate, the two permanent magnetic members are respectively threadedly connected to both ends of the bidirectional threaded rod and are radially slidably connected to the inner cylinder.

[0014] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein the permanent magnet member includes a stator housing base, a stator housing is detachably connected inside the stator housing base, a cavity is formed inside the stator housing, a piezoelectric ceramic ring and a first permanent magnet are arranged inside the cavity, the piezoelectric ceramic ring is fixedly connected inside the cavity, the first permanent magnet is limited and slidably connected inside the cavity, and presses the piezoelectric ceramic ring through repulsion.

[0015] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein a plurality of sliders are fixedly connected along the circumferential direction on the outer side wall of the stator housing base, a plurality of chutes are axially formed on the inner side wall of the inner cylinder, and the sliders are slidably connected with the chutes.

[0016] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein a plurality of limiting blocks are fixedly connected along the circumferential direction on the outer side wall of the stator housing, limiting grooves are formed on the inner wall of the slider, and the limiting blocks are adapted to the limiting grooves.

[0017] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein the permanent magnet inertial mass block includes a plurality of second permanent magnets, ferromagnetic steel gaskets are fixedly connected between adjacent two of the second permanent magnets, and repulsive forces exist between adjacent two of the second permanent magnets.

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

[0019] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein the housing includes a shell, a top cover and a bottom cover are respectively arranged at the top end and the bottom end of the shell, 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 sequentially penetrates through the bottom cover and the knob seat, the knob is sleeved on the bidirectional threaded rod and is limitedly connected to the bidirectional threaded rod through 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] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein an axial texture is arranged on the inner side wall of the inner cylinder.

[0021] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention, wherein a plurality of ventilation holes are formed on the shell.

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

[0023] A self-powered and self-sensing magnetic fluid energy harvesting device provided by the present invention uses a permanent magnet component to form a permanent magnet spring structure to replace the traditional spring to provide the restoring force of a new type of NES. By adjusting the component, the distance between the two permanent magnet components at both ends is changed, so that the stiffness of the energy harvesting device can be presented as purely non-linear and weakly non-linear according to a certain law, enabling the device to have the characteristic of targeted energy transfer with the main structure. This transfer has the characteristics of fast transfer speed and one-way irreversibility. At the same time, the resonant frequency of the permanent magnet inertial mass block can be changed, enabling the device to respond to various motion states. Through human motion, the permanent magnet inertial mass block moves radially, generating an induced current by cutting the coil and pushing the permanent magnet component, improving the energy collection efficiency. It is convenient to adjust later, the device has a small volume and high energy collection efficiency, and is convenient to carry around. The present invention can achieve resonance for different motion frequencies, is convenient to adjust, and improves the energy recovery efficiency of the human body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure of the collection device of the present invention;

[0026] Figure 2 It is a schematic diagram of the internal structure of the collection device of the present invention;

[0027] Figure 3 It is a cross-sectional view of the collection device of the present invention;

[0028] Figure 4 It is a schematic diagram of the state where the stator housing base and the stator housing of the present invention are not connected;

[0029] Figure 5 It is a schematic diagram of the state where the stator housing base and the stator housing of the present invention are connected;

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

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

[0032] Among them, 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. Bi-directional threaded rod; 7. Knob; 8. Stator seat; 9. Stator shell; 10. Piezoelectric ceramic ring; 11. First permanent magnet; 12. Slide block; 13. Slide groove; 14. Limit block; 15. Limit groove; 16. Groove; 17. Knob seat; 18. Positioning pin; 19. Adjusting cap; 20. Axial texture; 21. Vent hole. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0035] Referring to Figures 1 - 7 , the present invention provides a self-powered and self-sensing magnetic fluid energy harvesting device, including:

[0036] An outer shell 1, and an inner cylinder 5 is fixedly connected inside the outer shell 1;

[0037] A current component, including a permanent magnet inertial mass block 3 and a plurality of coils 4. The coils 4 are wound around the outer wall of the inner cylinder 5. Magnetic fluid 2 is stored inside the inner cylinder 5. The permanent magnet inertial mass block 3 is suspended inside the inner cylinder 5 through the magnetic fluid 2 and generates an induced current by cutting the magnetic field of the coils 4 during radial movement;

[0038] An adjusting component, including an adjusting member and two permanent magnetic members. The adjusting member 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 adjusting member. The two permanent magnetic members are respectively arranged at both ends of the adjusting member. The distance between the permanent magnetic member and the permanent magnet inertial mass block 3 is adjusted through the adjusting member. There is a repulsive force between the permanent magnet inertial mass block 3 and the permanent magnetic member. When the permanent magnet inertial mass block 3 moves radially, the permanent magnetic member is pushed by the repulsive force to generate an induced current.

[0039] In an embodiment of the present invention, a novel NES uses a permanent magnet component to form a permanent magnet spring structure to replace the traditional spring to provide a restoring force. By adjusting the component, the distance between the two permanent magnet components at both ends is changed, so that the stiffness of the energy harvesting device can be presented as pure non-linearity and weak non-linearity according to a certain law, enabling the device to have the characteristic of targeted energy transfer with the main structure. This transfer has the characteristics of fast transfer speed and unidirectionality (irreversibility). At the same time, the resonance frequency of the permanent magnet inertial mass block 3 can be changed, enabling the device to cope with various motion states. Through human motion, the permanent magnet inertial mass block 3 moves radially, generating an induced current by cutting the coil 4 and pushing the permanent magnet component, improving the energy collection efficiency. It is convenient to adjust later, has a small device volume and high energy collection efficiency, and is convenient to carry around.

[0040] As an alternative implementation, the adjusting component includes a bidirectional threaded rod 6. The permanent magnet inertial mass block 3 is sleeved on the bidirectional threaded rod 6, and there is a gap between the permanent magnet inertial mass block 3 and the bidirectional threaded rod 6. The bottom end of the bidirectional threaded rod 6 is rotatably connected to the bottom end inside the housing 1, and the top end of the bidirectional threaded rod 6 extends out of the top end of the housing 1 and is provided with a knob 7. By manually rotating the knob 7, the bidirectional threaded rod 6 is driven to rotate. The two permanent magnet components are respectively threadedly connected to both ends of the bidirectional threaded rod 6 and are radially slidably connected to the inner cylinder 5.

[0041] In an embodiment of the present invention, by rotating the knob 7, the bidirectional threaded rod 6 is driven to rotate, thereby changing the distance between the internal permanent magnets, simplifying the operation, and at the same time avoiding the entry of dust resulting in wear of the internal components. By changing the distance between the two permanent magnet components at both ends and the middle permanent magnet inertial mass block 3, the stiffness of the permanent magnet spring is changed, thereby changing the resonance frequency of the permanent magnet inertial mass block 3, enabling the device to cope with various motion states such as walking, running, leg shaking, and rope skipping, and maximizing the energy collection efficiency.

[0042] As an alternative implementation, the permanent magnet component includes a stator housing base 8. A stator housing 9 is detachably connected inside the stator housing base 8. A cavity is provided 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 presses the piezoelectric ceramic ring 10 by repulsion.

[0043] In an embodiment of the present invention, when a human body moves, the permanent magnet inertial mass block 3 reciprocates in the device. According to Newton's third law, the first permanent magnet 11 is subjected to the reaction force of the force, continuously pressing the piezoelectric ceramic ring 10 in contact with it, so that the piezoelectric ceramic ring 10 regularly generates an induced current. At the same time, the magnetic field in 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 an induced alternating current. The human body movement acceleration and frequency are calculated based on the current waveforms in the piezoelectric ceramic ring 10 and the coil 4, and the knob 7 can be rotated to the corresponding position according to the obtained results. This design with dual sensing ensures the accuracy of the results, and at the same time enables people to operate more conveniently and simply, reduces the application threshold, saves the adjustment time, and improves the adjustment efficiency.

[0044] As an alternative embodiment, a plurality of sliders 12 are fixedly connected to the outer side wall of the stator housing 8 in the circumferential direction, and a plurality of sliding grooves 13 are axially formed on the inner side wall of the inner cylinder 5. The sliders 12 are slidably connected to the sliding grooves 13.

[0045] In an embodiment of the present invention, the radial limiting sliding of the stator housing 8 is realized by the sliding of the arranged sliders 12 in the sliding grooves 13.

[0046] As an alternative embodiment, a plurality of limiting blocks 14 are fixedly connected to the outer side wall of the stator housing 9 in the circumferential direction, and limiting grooves 15 are formed on the inner wall of the sliders 12. The limiting blocks 14 are adapted to the limiting grooves 15.

[0047] In an embodiment of the present invention, the stator housing 9 is first placed on the stator housing base 8. After the stator housing 9 is manually rotated, the limiting blocks 14 on the stator housing 9 are screwed into the limiting grooves 15. At this time, the stator housing 9 and the stator housing base 8 are relatively stationary axially, and thus axially fixed.

[0048] As an alternative embodiment, the permanent magnet inertial mass block 3 includes a plurality of second permanent magnets 301. Ferromagnetic steel gaskets 302 are fixedly connected between adjacent second permanent magnets 301, and there is a repulsive force between adjacent second permanent magnets 301.

[0049] In an embodiment of the present invention, due to the repulsive force between the magnets, the attraction between only the second permanent magnet 301 and the ferromagnetic steel gasket 302 is not sufficient for fixation. Therefore, glue is used for fixation to make the connection more firm. Through holes of the same size are provided at the centers of the second permanent magnet 301 and the ferromagnetic steel gasket 302 in this structure. The bidirectional threaded rod 6 passes through the through hole at the exact center. A radial suspension force is generated between the two through the magnetic fluid 2, enabling the permanent magnet inertial mass block 3 to float on the guide rail. This avoids direct contact between the permanent magnet inertial mass block 3 and the bidirectional threaded rod 6, reduces wear while lubricating, thereby increasing the service life. The permanent magnet inertial mass block 3 serves as the magnetic source of the energy harvesting device. During the process of its sliding on the bidirectional threaded rod 6, the magnetic field in the coil winding continuously changes, thereby generating an induced current.

[0050] As an alternative embodiment, three grooves 16 are axially formed on the outer sidewall of the inner cylinder 5. The two grooves 16 at both ends have the same size, and the size is smaller than that of the groove 16 in the middle. A plurality of coils 4 are respectively wound in the three grooves 16.

[0051] In an embodiment of the present invention, three grooves 16 are axially formed on the outer sidewall of the inner cylinder 5. The wound coils 4 lead out the wire heads through the outer shell 1 for subsequent processing of the induced current.

[0052] As an alternative embodiment, the outer shell 1 includes a housing 101. A top cover 102 and a bottom cover 103 are respectively provided at the top and bottom of the housing 101. The bottom end of the bidirectional threaded rod 6 is rotatably connected to the top 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 sequentially passes through the bottom cover 103 and the knob seat 17. The knob 7 is sleeved on the bidirectional threaded rod 6 and is limitedly connected to the bidirectional threaded rod 6 through a positioning pin 18. A regulating cap 19 is threadedly connected to the top end of the bidirectional threaded rod 6, and the bottom end of the regulating cap 19 abuts against the top end of the knob 7.

[0053] In an 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 sealing and prevent leakage of the magnetic fluid 2. At the same time, both the knob 7 and the knob seat 17 are made of resin materials. Protrusions are arranged on the lower side of the knob 7, and grooves are arranged on the outer side of the knob seat 17, and the two can cooperate with each other. A through hole is provided on the side of the knob 7, and the positioning pin 18 connects the knob 7 and the bidirectional threaded rod 6 through this hole. A regulating cap 19 and a nut are respectively arranged on the knob 7. The damping force of the rotation of the knob 7 can be changed by adjusting the pressure of the regulating cap 19. Finally, the knob 7 can also be fixed by the regulating cap 19.

[0054] As an alternative embodiment, an axial texture 20 is provided on the inner sidewall of the inner cylinder 5.

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

[0056] As an alternative embodiment, a plurality of ventilation holes 21 are formed in the housing 101.

[0057] In one embodiment of the present invention, since the resistance in the coil 4 is inevitable, current will be generated during the energy harvesting process. According to Ohm's law, heat energy will be generated in this coil 4. The higher the temperature, the greater the resistance, and the lower the harvesting efficiency. By using the ventilation holes 21 for heat dissipation, the temperature of the coil 4 can be effectively reduced, and thermal equilibrium with the outside world can be achieved faster, improving the energy harvesting efficiency. Also, materials can be saved.

[0058] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0059] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A self-powered and self-sensing magnetic liquid energy harvesting device, characterized in that: include: An outer shell (1), wherein an inner cylinder (5) is fixedly connected to the inner part of the outer shell (1); A current component comprises a permanent magnet inertial mass block (3) and a plurality of coils (4), wherein the coils (4) are wound on the outer wall of the inner cylinder (5), a magnetic liquid (2) is stored in the inner cylinder (5), the permanent magnet inertial mass block (3) is suspended in the inner cylinder (5) through the magnetic liquid (2), and generates an induced current by cutting the magnetic field of the coils (4) when moving radially; An adjustment component comprises an adjustment member and two permanent magnet members, wherein the adjustment member is located in 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 member, and the two permanent magnet members are respectively arranged at two ends of the adjustment member, and the distance between the permanent magnet member and the permanent magnet inertial mass block (3) is adjusted by the adjustment member, and there is a repulsive force between the permanent magnet inertial mass block (3) and the permanent magnet member, and when the permanent magnet inertial mass block (3) moves radially, the repulsive force pushes the permanent magnet member to generate an induced current.

2. A self-powered and self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The adjusting member comprises a bidirectional threaded rod (6), the permanent magnet inertial mass block (3) is sleeved on the bidirectional threaded rod (6), and a gap is provided between the bidirectional threaded rod (6), the bottom end of the bidirectional threaded rod (6) is rotatably connected to the bottom end of the inner part of the housing (1), the top end of the bidirectional threaded rod (6) extends out of the top end of the housing (1), and a knob (7) is installed, and the bidirectional threaded rod (6) is driven to rotate by manually rotating the knob (7), and the two permanent magnets are respectively threadedly connected to the two ends of the bidirectional threaded rod (6) and are radially slidably connected to the inner cylinder (5).

3. A self-powered and self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The permanent magnet component comprises a stator housing seat (8), a stator housing (9) being detachably connected therein, a cavity being provided therein, a piezoelectric ceramic ring (10) and a first permanent magnet (11) being arranged in the cavity, the piezoelectric ceramic ring (10) being fixedly connected in the cavity, the first permanent magnet (11) being limitedly slidably connected in the cavity, and squeezing the piezoelectric ceramic ring (10) by a repulsive force.

4. A self-powered and self-sensing magnetic liquid energy harvesting device according to claim 3, characterized in that: A plurality of sliding blocks (12) are fixedly connected to the outer wall of the stator housing seat (8) in the circumferential direction, a plurality of sliding grooves (13) are opened in the axial direction on the inner wall of the inner cylinder (5), and the sliding blocks (12) are slidably connected to the sliding grooves (13).

5. A self-powered and self-sensing magnetic liquid energy harvesting device according to claim 4, characterized in that: A plurality of limit blocks (14) are fixedly connected to the outer wall of the stator housing (9) in the circumferential direction, and a limit groove (15) is provided on the inner wall of the slider (12), and the limit blocks (14) are adapted to the limit groove (15).

6. The self-powered and self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: The permanent magnet inertial mass block (3) comprises a plurality of second permanent magnets (301), a ferromagnetic steel gasket (302) being fixedly connected between two adjacent second permanent magnets (301), and a repulsive force is generated between two adjacent second permanent magnets (301).

7. The self-powered and self-sensing magnetic liquid energy harvesting device according to claim 1, characterized in that: Three grooves (16) are provided on the outer wall of the inner cylinder (5) along the axial direction. The two grooves (16) located at the two ends have the same size and are smaller than the size of the groove (16) located in the middle. The plurality of coils (4) are respectively wound in the three grooves (16).

8. The self-powered and self-sensing magnetic liquid energy harvesting device according to claim 2, characterized in that: The housing (1) comprises a shell (101), a top cover (102) and a bottom cover (103) are respectively arranged at the top and bottom of the shell (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 limitedly connected to the bidirectional threaded rod (6) through a positioning pin (18), the top end of the bidirectional threaded rod (6) is threadedly connected to an adjusting pressure cap (19), and the bottom end of the adjusting pressure cap (19) abuts against the top end of the knob (7).

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

10. The self-powered and self-sensing magnetic liquid energy harvesting device according to claim 8, characterized in that: The shell (101) is provided with a plurality of ventilation holes (21).

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