A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation

Abstract

The present invention discloses a piezoelectric - electromagnetic energy harvesting device with wind - induced vibration rotation. The device includes a base, an outer ring, an annular support plate, a bluff - body cantilever beam energy harvesting module, a rotating energy harvesting module, and a rotor transmission locking assembly. The rotating energy harvesting module includes a permanent magnet, a rotor support column, and a rotor coil; the rotor transmission locking assembly includes a torsion control assembly and a rotating control slide bar. The bluff - body cantilever beam energy harvesting module includes a bluff body, an elastic plate, and a piezoelectric sheet. The inner end of the elastic plate is fixed to the outer ring. The outer end of the elastic plate is fixed to the bluff body. Piezoelectric sheets are fixedly arranged on the elastic plate. The present invention introduces two modes of vibration and rotation, and realizes energy harvesting through the vibration of the bluff - body piezoelectric cantilever beam, the extrusion of the piezoelectric base by the cam mechanism, and the cutting of magnetic induction lines by the rotating coil, improves the bandwidth of the wind energy harvesting rate, and combines the two forms of rotation and vibration for energy collection.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy harvesting, and particularly relates to a piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation. Background Art

[0002] With the increasing demand for wireless sensor networks, how to power wireless sensors has become an increasingly concerned topic. Traditional battery power supply inevitably requires regular replacement, and it is also a difficult problem to replace the batteries for a large number of sensor nodes. There are various forms of energy in nature, such as wind energy, solar energy, thermal energy, etc. Therefore, using the energy in the environment to power wireless sensors has become a new research direction.

[0003] Common environmental energy harvesting methods include electromagnetic, electrostatic, piezoelectric, and triboelectric. Since vibration energy is ubiquitous in the surrounding environment, has a high energy density, and can generate relatively stable electric energy, it has always been the focus of research by scholars at home and abroad. Electromagnetic, as a relatively mature power generation principle, is coupled with piezoelectric energy in many occasions to improve the power generation performance. Wind energy is a clean, environmentally friendly, and renewable energy in nature, conforms to the ecological concept of sustainable development, is widely distributed, and has extremely broad development prospects. Therefore, the collection, conversion, and utilization of wind energy have become an important direction in the energy field in recent years.

[0004] In addition to various single energy harvesting forms, there are also a small number of composite energy harvesting forms in the existing wind-induced vibration energy harvesters. Nevertheless, there are still problems in the existing wind energy harvesters, such as single energy conversion method, low collection efficiency, low output power, narrow working wind speed range, high requirements for the incoming wind direction, etc. And most of the structures proposed currently are single working modes, that is, vibration or rotation. Summary of the Invention

[0005] The purpose of the present invention is to provide a piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation in view of the deficiencies of the prior art. By introducing two modes of vibration and rotation, energy harvesting is realized through the vibration of the bluff-body piezoelectric cantilever beam, the extrusion of the piezoelectric base by the cam mechanism, and the cutting of magnetic induction lines by the rotary coil, which improves the bandwidth of the wind energy collection rate and combines the two forms of rotation and vibration for energy harvesting.

[0006] A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation includes a base, an outer ring, an annular support plate, a bluff-body cantilever beam energy harvesting module, a rotary energy harvesting module, and a rotor transmission and locking assembly. The rotary energy harvesting module includes a permanent magnet, a rotor support column, and a rotor coil; the rotor support column is rotatably connected to the base. Multiple permanent magnets are fixed on the fixed sleeve and surround the outside of the rotor support column. A rotor coil is installed inside the rotor support column. The annular support plate rotates on the rotor support column. The outer ring is fixed to the annular support plate.

[0007] The described rotor drive locking assembly includes a torsion control assembly and a rotation control slide bar. A plurality of sliding grooves are provided at the top of the side surface of the rotor strut. Each sliding groove is arranged in sequence along the circumferential direction of the rotation axis of the rotor strut. The torsion control assembly includes a connecting ring and an elastic limiting rod fixed together. The connecting ring is fixed on the annular support plate. The inner ends of the elastic limiting rods are all fixed to the connecting ring. The elastic limiting rods are arranged in sequence along the circumferential direction of the central axis of the connecting ring. Each elastic limiting rod gradually approaches the rotor strut in the direction from the inner end to the outer end. The elastic limiting rods correspond to the sliding grooves on the rotor strut one by one. A first slider is arranged on the side of the outer end of the elastic limiting rod close to the rotor strut. The first slider at the outer end of the elastic limiting rod is slidably connected to the corresponding sliding groove on the rotor strut.

[0008] A number of guide holes are provided on the rotor strut, and a number of limiting holes are provided on the base. A rotation control slide bar is slidably connected in each guide hole. A second slider is fixed at the top of the rotation control slide bar. The second slider is connected to one of the first sliders.

[0009] In the initial state, the bottom end of the rotation control slide bar extends into the limiting hole of the bottom plate. During the process of the connecting ring rotating relative to the rotor strut, the elastic limiting rod is bent and deformed, driving each first slider to slide along the corresponding sliding groove; the first slider drives the rotation control slide bar to slide through the second slider.

[0010] A plurality of blunt body cantilever beam energy harvesting modules are all installed on the outside of the outer ring and are arranged in sequence along the circumferential direction of the outer ring. The blunt body cantilever beam energy harvesting module includes a blunt body, an elastic plate and a piezoelectric sheet. The inner end of the elastic plate is fixed to the outer ring. The outer end of the elastic plate is fixed to the blunt body. Piezoelectric sheets are fixed on the elastic plates.

[0011] Preferably, the piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation further includes a cam extrusion energy harvesting module. The described cam extrusion energy harvesting module includes a spring, a piezoelectric composite film, a pressure receiving plate, an inner cam ring and an annular support plate. The inner cam ring is fixed to the top end of the rotor strut. The outer ring is sleeved on the outside of the inner cam ring. A number of pressure receiving plates are installed on the inner side of the outer ring. Both ends of the pressure receiving plate are connected to the inner side surface of the outer ring through springs. The pressure receiving plate abuts against the outer contour of the inner cam ring. A piezoelectric composite film is provided on the pressure receiving plate.

[0012] Preferably, a number of mating surfaces arranged in sequence along the circumferential direction of its own axis are provided on the inner cam ring. Each mating surface is a flat surface. The number of mating surfaces is the same as the number of pressure receiving plates. The side surfaces of each pressure receiving plate away from the outer ring respectively abut against the mating surfaces on the outer contour of the inner cam ring.

[0013] Preferably, the axes of each guide hole are all parallel to the axis of the rotor strut and are evenly distributed along the circumferential direction of the rotor strut axis.

[0014] Preferably, the bluff body is in the shape of a cuboid.

[0015] Preferably, one side surface of the bluff body is flat, and the other side surface is a convex arc surface. The two side surfaces are arranged tangentially along the rotor strut.

[0016] Preferably, the bluff body is in the shape of a blade of a centrifugal fan.

[0017] Preferably, the bluff body cantilever energy harvesting module further includes a lug. The inner end of the elastic plate is fixed to the lug by a bolt; the lug is fixed to the outer side surface of the outer ring by a bolt.

[0018] Preferably, the base includes a fixed sleeve and a bottom plate. The fixed sleeve is fixed to the bottom plate by a countersunk head bolt. An installation groove is provided on the fixed sleeve; the bottom of the rotor strut is arranged in the installation groove; a bearing is arranged between the rotor strut and the installation groove.

[0019] Preferably, the inner side surface of the permanent magnet is arc-shaped.

[0020] The present invention has the following beneficial effects:

[0021] The present invention uses the outer ring fixed bluff body cantilever structure in different directions to sense the wind speed changes of different wind directions outside. When the wind speed is relatively small, the external cantilever structure vibrates to capture the energy at low wind speeds. When the wind speed increases, the force acting on the bluff body cantilever is transmitted to the outer ring, driving the outer ring to rotate. The pressure receiving piece arranged inside the outer ring deforms under the extrusion of the inner ring cam of the cam, so that the piezoelectric composite film attached to the pressure receiving piece generates a voltage output. As the wind speed further increases, the force acting on the bluff body cantilever causes the relative rotation of the inner and outer rings, releasing the limit of the support limiter. Thus, the inner hollow strut rotates relative to the permanent magnet, causing the coil to rotate in the magnet. At the same time, due to the instability of the rotation, the above energy harvesting module can still work continuously, further improving the efficiency of energy collection. Comprehensively improving the conversion efficiency of wind energy. Description of the Drawings

[0022] Figure 1 It is the overall schematic diagram of Embodiment 1 of the present invention.

[0023] Figure 2 It is the exploded schematic diagram of Embodiment 1 of the present invention.

[0024] Figure 3 It is the structural schematic diagram of the cam extruding the energy harvesting module in Embodiment 1 of the present invention.

[0025] Figure 4 It is the internal structural schematic diagram of Embodiment 1 of the present invention.

[0026] Figure 5 ForFigure 4 Partial enlarged view of part Ι.

[0027] Figure 6 is Figure 4 Partial enlarged view of part Ⅱ.

[0028] Figure 7 Schematic structural diagram of the bluff body cantilever beam energy harvesting module in Embodiment 1 of the present invention.

[0029] Figure 8 Schematic structural diagram of the bluff body cantilever beam energy harvesting module in Embodiment 2 of the present invention.

[0030] In the figure: 1. Bluff body cantilever beam; 2. End cover; 3. Outer ring; 4. Torsion control assembly; 4-1. Connecting ring; 4-2. Elastic limiting rod; 4-3. First slider; 5. Permanent magnet; 6. Fixed sleeve; 7. Bluff body; 8. Elastic plate; 9. Support ear; 10. Piezoelectric sheet; 11. Bolt; 12. Spring; 13. Piezoelectric composite film; 14. Pressure receiving plate; 15. Inner cam ring; 16. Rotor strut; 17. Rotor coil; 18. Bearing; 19. Rotation control slide bar; 20. Base plate; 21. Annular support plate; 22. Second slider. Detailed implementation manners

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Embodiment 1

[0033] As Figure 1 and 2 shown, a piezoelectric - electromagnetic energy harvesting device for wind - induced vibration rotation includes a base, an outer ring 3, an annular support plate 21, a bluff body cantilever beam energy harvesting module, a cam extrusion energy harvesting module, a rotation energy harvesting module, and a rotor transmission locking assembly. The rotation energy harvesting module is installed on the base. The annular support plate 21 and the outer ring 3 rotate on the top of the rotation energy harvesting module. The cam extrusion energy harvesting module is installed between the top of the rotation energy harvesting module and the outer ring 3. Four bluff body cantilever beam energy harvesting modules are installed on the outside of the outer ring 3. The rotor transmission locking assembly is installed between the cam extrusion energy harvesting module and the rotation energy harvesting module.

[0034] When the wind force is lower than the threshold range, the rotor strut 16 in the rotation energy harvesting module is locked under the action of the rotor transmission locking assembly, and the wind force drives the bluff body cantilever beam energy harvesting module and the cam extrusion energy harvesting module to reciprocate, generating electric energy by using the piezoelectric principle to realize the collection of tiny wind energy.

[0035] When the wind force is higher than the threshold range, the locking of the rotor strut 16 in the rotation energy harvesting module is released, and the rotor strut 16 rotates under the action of the wind force, generating electric energy by using the electromagnetic induction principle to improve the wind energy collection efficiency under strong wind force.

[0036] As Figure 1 and 2 shown, the base includes a fixed sleeve 6 and a base plate 20. The fixed sleeve 6 is fixed to the base plate 20 by countersunk bolts; the rotary energy harvesting module includes a permanent magnet 5, a rotor support column 16, a rotor coil 17 and a bearing 18; an installation groove is formed on the fixed sleeve 6. The bottom of the rotor support column 16 is arranged in the installation groove and forms a rotating pair with the bottom of the installation groove through the bearing 18. The paired permanent magnets 5 are fixed on the fixed sleeve 6 and surround the outside of the rotor support column 16. The inner side surface of the permanent magnet 5 is arc-shaped and centered on the rotation axis of the rotor support column 16. The rotor coil 17 is installed inside the rotor support column 16; when the rotor support column 16 rotates, the rotor coil 17 cuts the magnetic induction lines of the permanent magnet 5 to generate electric energy.

[0037] As Figure 3 shown, the cam extrusion energy harvesting module includes a spring 12, a piezoelectric composite film 13, a pressure receiving plate 14 and a cam inner ring 15. The cam inner ring 15 is coaxially fixed to the top end face of the rotor support column 16. An annular support plate 21 is arranged on the stepped surface at the top of the rotor support column 16 and forms a rotating pair with the rotor support column 16. The outer ring 3 is fixed to the annular support plate 21.

[0038] Four mating surfaces are arranged in sequence along the circumferential direction of its own axis on the cam inner ring 15. Each mating surface is a flat surface. Four pressure receiving plates 14 are installed on the inner side of the outer ring 3. Each pressure receiving plate 14 is arranged in sequence along the circumferential direction of the cam inner ring 15. Both ends of the pressure receiving plate 14 are connected to the inner side surface of the outer ring 3 by springs 12. The sides of the four pressure receiving plates 14 away from the outer ring 3 respectively abut against the four mating surfaces on the outer contour of the cam inner ring 15. The piezoelectric composite film 13 is arranged on the side surface of the pressure receiving plate 14. The pressure receiving plate 14 is made of an elastic material; when the outer ring 3 rotates relative to the cam inner ring 15, the pressure receiving plate 14 abutting against the cam inner ring 15 is deformed, so that the piezoelectric composite film 13 outputs electric energy.

[0039] As Figure 4 、 5 and 6 shown, the rotor transmission locking assembly includes a torsion control assembly 4 and a rotary control slide bar 19. A plurality of sliding grooves are formed at the top side of the rotor support column 16. Each sliding groove is evenly distributed along the circumferential direction of the rotation axis of the rotor support column 16. The torsion control assembly 4 is made of PET material and includes a connecting ring 4-1 and an elastic limiting rod 4-2 fixed together. The connecting ring 4-1 is coaxially fixed to the annular support plate 21. The inner ends of the elastic limiting rods 4-2 are fixed to the side surface of the connecting ring 4-1 away from the annular support plate 21. The elastic limiting rods 4-2 are evenly distributed along the circumferential direction of the central axis of the connecting ring 4-1. Each elastic limiting rod 4-2 gradually approaches the rotor support column 16 in the direction from the inner end to the outer end.

[0040] The number of elastic limit rods 4-2 is the same as and corresponds one by one to the number of sliding grooves on the rotor support column 16. On the side of the outer end of the elastic limit rod 4-2 close to the rotor support column 16, a first slider 4-3 is provided. The first slider 4-3 at the outer end of the elastic limit rod 4-2 is slidably connected to the corresponding sliding groove on the rotor support column 16.

[0041] When the torsion control assembly 4 is subjected to a torque, it will cause the annular support plate 21 to have a tendency to rotate relative to the rotor support column 16; this tendency causes the connecting ring 4-1 in the torsion control assembly 4 to rotate relative to the rotor support column 16, and the elastic limit rod 4-2 bends accordingly. Since the height of the annular support plate 21 remains unchanged during rotation, during the bending process of the elastic limit rod 4-2, the first slider 4-3 at the outer end of the elastic limit rod 4-2 slides upward in the corresponding sliding groove. The greater the torque applied to the torsion control assembly 4, the greater the bending degree of the elastic limit rod 4-2, and the higher the position of the first slider 4-3 at the outer end of the elastic limit rod 4-2.

[0042] Four guiding holes are provided on the rotor support column 16. The axes of the respective guiding holes are all parallel to the axis of the rotor support column 16 and are circumferentially evenly distributed along the axis of the rotor support column 16. Four limiting holes are provided on the bottom plate 20 and are circumferentially evenly distributed along the axis of the rotor support column 16. The distance from the axis of each limiting hole to the axis of the rotor support column 16 is equal to the distance from the axis of each guiding hole to the axis of the rotor support column 16. The four guiding holes respectively correspond to four of the sliding grooves. The side part at the top end of the guiding hole communicates with the side surface of the corresponding sliding groove close to the axis of the rotor support column 16. Four rotary control sliding rods 19 are respectively slidably connected to the four guiding holes. Second sliders 22 are fixed to the side parts at the top ends of the four rotary control sliding rods 19. The second sliders 22 are located in the corresponding sliding grooves. The second sliders 22 support on the first sliders 4-3 in the corresponding sliding grooves.

[0043] In the initial state, the bottom ends of the four rotary control sliding rods 19 respectively extend into the four limiting holes of the bottom plate 20 to lock the rotor support column 16.

[0044] When the first slider 4-3 rises as the torsion control assembly 4 twists, it will drive each rotary control sliding rod 19 to rise through each second slider 22; when the torsion control assembly 4 is subjected to a torque exceeding a preset value, the rotary control sliding rod 19 rises to a sufficient height so that the rotary control sliding rod 19 is separated from the four limiting holes of the bottom plate 20; at this time, the locking of the rotor support column 16 is released; the rotor support column 16 can rotate driven by the torsion control assembly 4, causing the rotor coil 17 to generate electrical energy.

[0045] As Figure 1 and 7As shown, the four blunt-body cantilever energy harvesting modules are all installed on the outer side of the outer ring 3 and arranged in sequence along the circumferential direction of the outer ring 3. The blunt-body cantilever energy harvesting module includes a blunt body 7, an elastic plate 8, an ear 9, a piezoelectric sheet 10, and a bolt 11. The ear 9 is fixed to the outer side surface of the outer ring 3 through the bolt 11. The inner end of the elastic plate 8 is fixed to the ear 9 through a bolt; the outer end of the elastic plate 8 is fixed to the blunt body 7. Piezoelectric sheets 10 are fixed on both sides of the elastic plate 8. When the airflow in the environment passes through the blunt body 7, it will drive the blunt body 7 to move, causing the elastic plate 8 to swing back and forth, and further causing the piezoelectric sheet 10 to generate electric energy, realizing power generation.

[0046] In this embodiment, the blunt body 7 is in the shape of a cube.

[0047] The working principle of this wind-induced vibration rotary piezoelectric-electromagnetic energy harvesting device is as follows:

[0048] In the initial state, the rotor strut 16 is locked under the action of the rotation control slide bar 19. When the wind speed in the environment is very small, vortex shedding occurs on the surface of the blunt body 7 when the flow field passes through it, causing the elastic plate 8 connected to the blunt body to vibrate under forced vibration. Therefore, the piezoelectric sheets pasted on both sides of the elastic plate 8 generate alternating strains, thereby generating a certain voltage output.

[0049] When the wind speed in the environment further increases, the vibration acting on the cantilever beam will be transmitted from the ear 9 to the outer ring 3, causing relative movement between the outer ring 3 and the inner cam ring 15 within a certain range. Furthermore, the piezoelectric composite film 13 fixed on the pressure receiving plate 14 inside the outer ring 3 will be deformed under the extrusion of the inner cam ring 15, thereby converting the vibration energy into electric energy. During the rotation of the outer ring 3 relative to the inner cam ring 15, it is subject to the restraint force of the torsion control assembly 4. Therefore, the outer ring 3 can only rotate back and forth relative to the inner cam ring 15; the greater the rotation amplitude of the outer ring 3 relative to the inner cam ring 15, the greater the deformation amplitude of the elastic limit rod 4-2 in the torsion control assembly 4, and the greater the amplitude of the first slider 4-3 at the outer end of the elastic limit rod 4-2 driving the rotation control slide bar 19 to rise.

[0050] When the wind force exceeds the threshold value, the rotation amplitude of the outer ring 3 relative to the inner cam ring 15 exceeds the threshold value, and the bottom end of the rotation control slide bar 19 disengages from the limit hole; at this time, the locking of the rotor strut 16 is released; the outer ring 3 drives the rotor strut 16 to rotate through the torsion control assembly 4, and the rotor coil 17 cuts the magnetic induction line to generate electric energy, improving the efficiency of wind energy conversion. Since the rotor strut 16 and the permanent magnet 5 generate relative rotational motion, the efficiency of wind energy conversion is further improved during the rotation process.

[0051] Embodiment 2

[0052] A wind-induced vibration rotary piezoelectric-electromagnetic energy harvesting device. The difference between this embodiment and Embodiment 1 is only that: the shape of the blunt body 7 is different.

[0053] As Figure 8 shown, in this embodiment, one side surface of the bluff body 7 is planar, and the other side surface is a convex arc surface. These two side surfaces are arranged tangentially along the rotor strut 16.

[0054] In each bluff body cantilever beam energy harvesting module, the planar side surface of the bluff body 7 is on the same side as the convex arc surface side surface. Since the wind resistance coefficient of the convex arc surface side surface is smaller than that of the planar side surface, the thrusts generated by the same separation for the two bluff body cantilever beam energy harvesting modules located on the opposite sides of the rotor strut 16 are inconsistent, so that the rotor strut 16 can rotate.

[0055] Embodiment 3

[0056] A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation. The difference between this embodiment and Embodiment 1 is only that: the shape of the bluff body 7 is different.

[0057] In this embodiment, the bluff body 7 is in the shape of a blade of a centrifugal fan. It can further improve the wind energy utilization efficiency.

Claims

1. A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation, comprising a base, an outer ring (3), an annular support plate (21), and a blunt body cantilever beam energy harvesting module; characterized in that: It also includes a rotational energy harvesting module and a rotor drive locking assembly; the rotational energy harvesting module includes a permanent magnet (5), a rotor support column (16), and a rotor coil (17); the rotor support column (16) is rotatably connected to the base; multiple permanent magnets (5) are fixed on the fixed sleeve (6) and surround the outside of the rotor support column (16); a rotor coil (17) is installed inside the rotor support column (16); an annular support plate (21) rotates on the rotor support column (16); the outer ring (3) is fixed on the annular support plate (21). The rotor drive locking assembly includes a torsion control assembly (4) and a rotation control slide bar (19); multiple chutes are provided at the top side of the rotor support column (16); each chute is arranged in sequence along the circumferential direction of the rotation axis of the rotor support column (16); the torsion control assembly (4) includes a connecting ring (4-1) and an elastic limiting rod (4-2) fixed together; the connecting ring (4-1) is fixed on the annular support plate (21); the inner ends of the elastic limiting rods (4-2) are all fixed to the connecting ring (4-1); the elastic limiting rods (4-2) are arranged in sequence along the circumferential direction of the central axis of the connecting ring (4-1); the elastic limiting rods (4-2) gradually approach the rotor support column (16) in the direction from the inner end to the outer end; the elastic limiting rods (4-2) correspond to the chutes on the rotor support column (16) one by one; a first slider (4-3) is provided on the side of the outer end of the elastic limiting rod (4-2) close to the rotor support column (16); the first slider (4-3) at the outer end of the elastic limiting rod (4-2) is slidably connected to the corresponding chute on the rotor support column (16). A number of guide holes are provided on the rotor support column (16); a number of limiting holes are provided on the base; a rotation control slide bar (19) is slidably connected in each guide hole; a second slider (22) is fixed at the top end of the rotation control slide bar (19); the second slider (22) is connected to one of the first sliders (4-3). In the initial state, the bottom end of the rotation control slide bar (19) extends into the limiting hole of the bottom plate (20); during the rotation of the connecting ring (4-1) relative to the rotor support column (16), the elastic limiting rod (4-2) is bent and deformed, driving each first slider (4-3) to slide along the corresponding chute; the first slider (4-3) drives the rotation control slide bar (19) to slide through the second slider (22). Multiple blunt body cantilever beam energy harvesting modules are all installed on the outside of the outer ring (3) and arranged in sequence along the circumferential direction of the outer ring (3); the blunt body cantilever beam energy harvesting module includes a blunt body (7), an elastic plate (8), and a piezoelectric sheet (10); the inner end of the elastic plate (8) is fixed to the outer ring (3); the outer end of the elastic plate (8) is fixed to the blunt body (7); piezoelectric sheets (10) are all fixed on the elastic plate (8).

2. The piezoelectric-electromagnetic energy harvesting device for wind-induced vibration rotation according to claim 1, wherein: It further includes a cam extrusion energy harvesting module; the cam extrusion energy harvesting module includes a spring (12), a piezoelectric composite film (13), a pressure receiving plate (14), a cam inner ring (15), and an annular support plate (21); the cam inner ring (15) is fixed to the top of the rotor support column (16); the outer ring (3) is sleeved outside the cam inner ring (15); several pressure receiving plates (14) are installed on the inner side of the outer ring (3); both ends of the pressure receiving plate (14) are connected to the inner side surface of the outer ring (3) through springs (12); the pressure receiving plate (14) abuts against the outer contour of the cam inner ring (15); and a piezoelectric composite film (13) is arranged on the pressure receiving plate (14).

3. The piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 2, characterized in that: A number of mating surfaces arranged in sequence along the circumferential direction of the axis of the cam inner ring (15) are provided on the cam inner ring (15); each mating surface is a flat surface; the number of mating surfaces is the same as the number of pressure receiving plates (14); the side surfaces of each pressure receiving plate (14) away from the outer ring (3) respectively abut against the mating surfaces on the outer contour of the cam inner ring (15).

4. A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, characterized in that: The axes of the respective guide holes are all parallel to the axis of the rotor support column (16) and are evenly distributed along the circumferential direction of the axis of the rotor support column (16).

5. A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, characterized in that: The blunt body (7) is in the shape of a cuboid.

6. The piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, wherein: One side surface of the blunt body (7) is flat, and the other side surface is an outwardly convex arc surface; these two side surfaces are arranged tangentially to the rotor support column (16).

7. A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, characterized in that: The blunt body (7) is in the shape of a blade of a centrifugal fan.

8. A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, characterized in that: The blunt body cantilever beam energy harvesting module further includes an ear (9); the inner end of the elastic plate (8) is fixed to the ear (9) by bolts; the ear (9) is fixed to the outer side surface of the outer ring (3) by bolts (11).

9. The piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, characterized in that: The base includes a fixed sleeve (6) and a bottom plate (20); the fixed sleeve (6) is fixed to the bottom plate (20) by countersunk head bolts; an installation groove is provided on the fixed sleeve (6); the bottom of the rotor support column (16) is arranged in the installation groove; and a bearing (18) is arranged between the rotor support column (16) and the installation groove.

10. A piezoelectric-electromagnetic energy harvesting device with wind-induced vibration rotation according to claim 1, characterized in that: The inner side surface of the permanent magnet (5) is arc-shaped.

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