CN113224975B - Windmill-shaped multi-direction broadband piezoelectric electromagnetic vibration energy collecting device - Google Patents
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Abstract
The invention provides a windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device, which relates to the field of new energy and comprises a strut connected with a vibration source, an outer wheel shell of which the bottom is connected with a CTS-type spring vibration isolator, an annular permanent magnet of which the inner ring is radially magnetized and at least four power generation units, wherein one end of the CTS-type spring vibration isolator, which is far away from the outer wheel shell, is connected with the vibration source, the annular permanent magnet is arranged on the strut, the center of the annular permanent magnet is superposed with the circle center of the outer wheel shell, and the at least four power generation units are arranged in a groove on the inner surface of the outer wheel shell at equal angles around the center of the annular permanent magnet. The invention can make up the defects that the energy collecting device in the existing vibration energy collecting technology can only vibrate in a certain fixed direction, the collected vibration frequency band is narrow, the energy collecting efficiency is low and the like; the vibration energy collecting device can be applied to a wide range of occasions, and can effectively collect vibration energy in a working environment even if multi-direction and multi-frequency vibration exists in the working environment.
Description
Technical Field
The invention relates to the technical field of new energy, in particular to a windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device.
Background
At present, the development of the internet of things is rapid, the internet of things is an internet with all things connected, and a huge number of various information sensors, radio frequency identification technologies, GPS and other devices and technologies are combined with a network to form a huge network system of the internet of things together, so that the interconnection and the intercommunication of people, machines and things at any time and any place can be realized. Tens of thousands of various information sensors in the internet of things often need to work continuously, so that a key factor for restricting the development of the internet of things technology is the energy supply problem of the information sensors.
The traditional battery has limited energy supply life, complex battery packaging process and easy leakage in the using process, and the traditional battery is easy to cause serious toxic pollution to the natural environment. The structure and the size of the traditional battery are relatively fixed, so that the diversification of the structure of the information sensor is limited. In a huge internet of things, tens of thousands of information sensors are dispersedly installed in different places, the installation environment of most sensors is severe, and the cost for replacing batteries for the sensors cannot be high at all or is too high, so that the self-powered technology of the sensors is urgently needed for solving the problems. The wireless sensor system has the advantages that abundant vibration energy exists in the working environment, and the vibration energy widely existing in the working environment can be utilized through a new energy technology to supply power for the wireless sensor system.
Vibration energy harvesters are implemented primarily by the following three means: piezoelectric, electromagnetic, and electrostatic. The basic principle of the piezoelectric vibration energy collector is the positive piezoelectric effect, and the conversion from mechanical energy to electric energy can be realized. The basic principle of the electromagnetic vibration energy harvester is the faraday's law of electromagnetic induction, which can realize the conversion of magnetic energy to electrical energy. The electrostatic vibration energy collector adopts a variable capacitance structure, generates charges through relative motion between two plates, but generally needs an external voltage source for working, and has low energy collection efficiency and high manufacturing precision requirement, which limits the development and application of an electrostatic type. Thus, the more common approaches to vibration energy harvesters are piezoelectric and electromagnetic. In recent years, researchers at home and abroad have researched various energy collecting devices, including a multi-frequency energy collector, a three-axis ball piezoelectric device, an omnidirectional impact type energy collecting device, a cubic-mass block structure, a three-degree-of-freedom array type, a linear-arch combined beam, a collision magnetic repulsion bistable structure and the like.
Although research on vibration energy collectors has been advanced to some extent at present, vibration in the environment where various information sensors in the internet of things are installed is low-frequency, multidirectional and irregular, and how to effectively collect vibration energy in such working environment is a difficult problem to be solved urgently.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device, which solves the problems in the background art.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides a multi-direction broadband piezoelectricity electromagnetism vibration energy collection device of windmill form, is connected with the outer wheel shell, the annular permanent magnet and four at least power generation units that the inner circle radiation magnetizes of CTS type spring isolator including the pillar of connecting the vibration source, bottom, the one end that the outer wheel shell was kept away from to CTS type spring isolator is connected the vibration source, annular permanent magnet sets up on the pillar, the center of annular permanent magnet and the coincidence of the centre of a circle of outer wheel shell, at least four power generation units wind annular permanent magnet center equipartition angle setting in the internal surface recess of outer wheel shell.
The power generation unit comprises a permanent magnet spring combination beam assembly and a PVDF piezoelectric beam assembly.
The permanent magnet and spring combined beam assembly comprises an upper cross beam, a lower cross beam, an upper permanent magnet, a collision block at the bottom of the upper permanent magnet, a lower mass block at the top of the lower mass block, a pair of linear-arched combined beams which are symmetrical according to a central axis, a pair of PVDF piezoelectric thin film materials, a pair of upper disc supports, a pair of lower permanent magnets, a pair of springs and guide rods of the springs, wherein the PVDF piezoelectric thin film materials are flatly attached to the linear-arched combined beams, the upper ends and the lower ends of the linear-arched combined beams are respectively connected with the upper cross beam and the lower cross beam, the bottom ends of the linear-arched combined beams are connected with the upper disc supports and the lower disc supports, the lower disc supports are connected with the springs and the guide rods of the springs, the bottom ends of the springs and the guide rods of the springs are fixed on the inner surface of an outer wheel shell, the upper permanent magnet is arranged on the upper cross beam, and the lower mass block is arranged on the lower cross beam.
The PVDF piezoelectric beam assembly comprises an upper frame, a lower frame, a conductive support, a PVDF piezoelectric beam, a propelling block and a locking bolt, wherein the upper frame and the lower frame are overlooked to form a hollow rectangular structure in a shape like a Chinese character 'hui', the propelling block is arranged between the upper frame and the lower frame and can move back and forth along the direction parallel to the surface of the upper frame and the surface of the lower frame, the locking bolt is in threaded connection with the upper frame and corresponds to the propelling block, one end of the PVDF piezoelectric beam is clamped by the upper frame and the lower frame, the other end of the PVDF piezoelectric beam is arranged in a gap on the inner side of the propelling block to be clamped, and the lower frame is connected with the inner surface of an outer wheel shell through the conductive support.
The first collision block and the second collision block correspond to the upper surface and the lower surface of the PVDF piezoelectric beam respectively.
Preferably, PVDF piezoelectric beam subassembly still includes a pair of hollow coil one, hollow coil two, hollow coil one, hollow coil two are the multilayer coil, and the number of turns is 1250, and every layer of coil is single-phase concentric winding planar coil, has insulating barrier material between every layer of coil, hollow coil one, hollow coil two are circular hollow structure, and the coil centers on its axle center adjacent arrangement, hollow coil one, hollow coil two are fixed respectively in the lower part of two electrically conductive pillars, hollow coil one, hollow coil two center respectively around two lower extreme permanent magnet 1/2 the latter half and below.
Preferably, the annular permanent magnet is magnetized by adopting an inner ring radiation magnetizing mode, the inner surface of the ring is an S pole, and the outer surface of the ring is an N pole.
Preferably, the upper end permanent magnet and the lower end mass block are respectively fixed at the middle positions of the upper cross beam and the lower cross beam, the first impact block is arranged at the center of the lower surface of the upper end permanent magnet, the second impact block is arranged at the center of the upper surface of the lower end mass block, and the first impact block and the second impact block vertically correspond to the deepest depression of the PVDF piezoelectric beam.
Preferably, two small holes are formed in the lower cross beam at symmetrical positions near two sides of the lower end mass block, and the small holes are used for penetrating through the conductive support columns.
Preferably, the upper frame and the lower frame are connected and fastened by fixing bolts screwed at four corners of the upper frame.
Preferably, the mass of the upper end permanent magnet and the mass of the lower end mass of each power generation unit are the same or different.
Preferably, the magnetic pole of the upper permanent magnet of each power generation unit is an upper surface N pole, that is, the same as the magnetic pole of the outer surface of the annular permanent magnet charged with the inner ring in a radiation manner.
Preferably, the annular permanent magnet, the upper end permanent magnet and the lower end mass block are made of neodymium iron boron alloy.
(III) advantageous effects
The invention provides a windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device. The method has the following beneficial effects:
1. the windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device can overcome the defects that the energy collecting device can only vibrate in a certain fixed direction, the collected vibration frequency band is narrow, the energy collecting efficiency is low and the like in the conventional vibration energy collecting technology; the vibration energy collecting device can be applied to a wide range of occasions, and can effectively collect vibration energy in a working environment even if multi-direction and multi-frequency vibration exists in the working environment.
Drawings
FIG. 1 is a schematic view of a power generation unit of the present invention;
FIG. 2 is a front view of the present invention;
fig. 3 is a side view of the present invention.
In the figure: 101 pillars, 102 ring-shaped permanent magnets, 103 outer wheel shells, 104CTS type spring vibration isolators, 105 power generation units, 201 upper end permanent magnets, 202 lower end mass blocks, 203 collision block I, 204 collision block II, 205 upper cross beams, 206 lower cross beams, 207 linear-arch combination beams, 208PVDF piezoelectric film materials, 209 upper disc pillars, 210 lower disc pillars, 211 lower end permanent magnets, 212 springs and guide rods thereof, 301 upper frames, 302 lower frames, 303 conductive pillars, 304 hollow coil I, 305 hollow coil II, 306PVDF piezoelectric beams, 307 propelling blocks, 308 fixing bolts and 309 locking bolts.
Detailed Description
The embodiment of the invention provides a windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device, which comprises a support 101 connected with a vibration source, an outer wheel shell 103 with the bottom connected with a CTS-type spring vibration isolator 104, an annular permanent magnet 102 with an inner ring radiating and magnetizing function and at least four power generation units 105, wherein one end of the CTS-type spring vibration isolator 104, which is far away from the outer wheel shell 103, is connected with the vibration source, the annular permanent magnet 102 is arranged on the support 101, the center of the annular permanent magnet 102 is overlapped with the circle center of the outer wheel shell 103, and the at least four power generation units 105 are arranged in a groove on the inner surface of the outer wheel shell 103 at equal angles around the center of the annular permanent magnet 102.
The power generation unit 105 includes a permanent magnet spring composite beam assembly and a PVDF piezoelectric beam assembly.
The permanent magnet and spring combined beam assembly comprises an upper cross beam 205, a lower cross beam 206, an upper end permanent magnet 201, an impact block 203 at the bottom of the upper end permanent magnet 201, an impact block 204 at the top of the lower end mass block 202, a pair of linear-arch combined beams 207 which are symmetrical according to a central axis, a pair of PVDF piezoelectric thin film materials 208, a pair of upper disc supports 209, a pair of lower disc supports 210, a pair of lower end permanent magnets 211, a pair of springs and guide rods 212 thereof, wherein the PVDF piezoelectric thin film materials 208 are flatly attached to the linear-arch combined beams 207, the upper end and the lower end of the linear-arch combined beams 207 are respectively connected with the upper cross beam 205 and the lower cross beam 206, the lower end permanent magnets 211 are fixed by the upper disc supports 209 and the lower disc supports 210, the lower disc supports 210 are connected with the springs and the guide rods 212 thereof, the bottom ends of the springs and the guide rods 212 thereof are fixed on the inner surface of the outer wheel housing 103, the upper end permanent magnet 201 is arranged on the upper cross beam 205, and the lower end mass block 202 is arranged on the lower cross beam 206.
The annular permanent magnet 102 is magnetized by adopting an inner ring radiation magnetizing mode, the inner surface of the ring is an S pole, and the outer surface of the ring is an N pole. The magnetic pole of the upper permanent magnet 201 of each power generation unit 105 is an upper surface N pole, i.e. the same as the magnetic pole of the outer surface of the annular permanent magnet 102 which is radially magnetized in the inner ring.
The annular permanent magnet 102, the upper end permanent magnet 201 and the lower end mass block 202 are all made of neodymium iron boron alloy.
A first power generation assembly: after the device is assembled, the device is subjected to vibration excitation, and the annular permanent magnet 102 which is radially magnetized at the inner ring is also subjected to forced vibration. The inner ring of the annular permanent magnet 102 is an S pole, the outer ring is an N pole, and the annular permanent magnet 102 and the upper end permanent magnet 201 are subjected to a repulsive force in a downward direction due to the same polarity of opposite surfaces when the vibration direction is downward at a certain moment. At this time, the pair of linear-arched composite beams 207 is deformed, so that the pair of PVDF piezoelectric thin film materials 208 attached thereto is deformed accordingly. The electric dipole moment in the PVDF body is shortened by compression, and the piezoelectric material can generate equal positive and negative charges on the opposite surfaces of the material to keep the same state in order to resist the change. This phenomenon of electric polarization due to deformation is called "positive piezoelectric effect", whereby mechanical energy is converted into electric energy.
The PVDF piezoelectric beam assembly comprises an upper frame 301, a lower frame 302, a conductive strut 303, a PVDF piezoelectric beam 306, a pushing block 307 and a locking bolt 309, wherein the upper frame 301 and the lower frame 302 are in a hollow rectangular structure in a shape like a Chinese character 'hui' in a plan view, the pushing block 307 is arranged between the upper frame 301 and the lower frame 302 and can move back and forth along the direction parallel to the surfaces of the upper frame and the lower frame, and the locking bolt 309 is in threaded connection with the upper frame 301 and corresponds to the pushing block 307, so that the PVDF piezoelectric beam 306 is in bending deflection suitable for an application environment. The more the propelling block 307 moves leftwards, the larger the bending deflection of the PVDF piezoelectric beam 306 is, the larger the required impact force is, the more the generated electric energy is, and the PVDF piezoelectric beam is suitable for occasions with large exciting force; the more the pushing block 307 moves to the right, the smaller the bending deflection of the PVDF piezoelectric beam 306, the smaller the required impact force, and the less electric energy is generated, and thus the driving force is suitable for the occasion with small excitation force. One end of the PVDF piezoelectric beam 306 is clamped by the upper frame 301 and the lower frame 302, and the other end is clamped in a slit placed inside the thrust block 307, and the lower frame 302 is connected to the inner surface of the outer wheel housing 103 through the conductive pillar 303. The upper frame 301 and the lower frame 302 are connected and fastened by fixing bolts 308 screwed at four corners of the upper frame 301.
The first bump 203 and the second bump 204 correspond to the upper surface and the lower surface of the PVDF piezoelectric beam 306 respectively.
An upper end permanent magnet 201 and a lower end mass 202 are respectively fixed at the middle positions of an upper cross beam 205 and a lower cross beam 206, an impact mass one 203 is arranged at the center position of the lower surface of the upper end permanent magnet 201, and an impact mass two 204 is arranged at the center position of the upper surface of the lower end mass 202. The mass of the upper permanent magnet 201 and the mass of the lower mass block 202 of each power generation unit 105 are the same or different, so as to achieve the purpose of reducing and changing the self resonant frequency of the power generation unit 105, and make it better suitable for specific working environment. The first impact block 203 and the second impact block 204 correspond to the deepest part of the depression of the PVDF piezoelectric beam 306 up and down.
A second power generation assembly: in the initial state of the PVDF piezoelectric beam 306, as the propulsion block 307 is adjusted to be convex upwards, the whole permanent magnet-spring combined beam structure is forced to displace downwards while the upper permanent magnet 201 is subjected to a repulsive force in a downward direction, so that the first collision block 203 collides with the PVDF piezoelectric beam 306, and the state of the PVDF piezoelectric beam is changed from convex upwards to concave downwards. Due to the existence of the bottom spring and the guide rod 212 structure thereof, the downward movement state cannot be maintained, the spring exerts upward elastic force on the permanent magnet-spring combined beam structure in order to restore the original state, the whole structure is forced to displace upwards, and in the process, the second collision block 204 collides with the PVDF piezoelectric beam 306, so that the state of the PVDF piezoelectric beam is changed from concave to convex. In the reciprocating process, the state of the PVDF piezoelectric beam 306 is continuously changed from convex to concave and from concave to convex, and the process is repeated, and the electric energy is continuously generated due to continuous deformation.
The PVDF piezoelectric beam assembly further comprises a pair of a first hollow coil 304 and a second hollow coil 305, the first hollow coil 304 and the second hollow coil 305 are multilayer coils, the number of turns is 1250, each layer of coil is a single-phase concentric winding planar coil, an insulating isolation material is arranged between each layer of coil, the first hollow coil 304 and the second hollow coil 305 are circular hollow structures, the coils are adjacently arranged around the axis of the coils, the first hollow coil 304 and the second hollow coil 305 are respectively fixed at the lower parts of the two conductive struts 303, and the first hollow coil 304 and the second hollow coil 305 respectively surround the lower half parts and the lower parts of the two lower end permanent magnets 2111/2.
The lower beam 206 has two small holes symmetrically formed near both sides of the lower mass 202 for passing through the conductive posts 303.
A third power generation assembly: while the upper permanent magnet 201 is subjected to a downward repulsive force, the whole permanent magnet-spring combined beam structure is also subjected to a force to generate downward displacement, and the second part is fixed below the conductive strut 303, and a pair of a first hollow coil 304 and a second hollow coil 305 surrounds the lower half part and the lower half part of the lower permanent magnet 1/2 of the first part. When the lower permanent magnet 211 is displaced downwards, the lower permanent magnet 211 is gradually inserted into the first hollow coil 304 and the second hollow coil 305, so that the magnetic fluxes of the first hollow coil 304 and the second hollow coil 305 are increased, and due to the existence of the bottom spring and the structure of the guide rod 212 thereof, the lower permanent magnet 211 is then displaced upwards, and the lower permanent magnet 211 is gradually pulled out of the first hollow coil 304 and the second hollow coil 305, so that the magnetic fluxes of the first hollow coil 304 and the second hollow coil 305 are reduced. In the reciprocating process of the first air coil 304 and the second air coil 305, the magnetic flux changes continuously, and according to the faraday's law of electromagnetic induction, the first air coil 304 and the second air coil 305 generate induced current continuously.
When the device is not excited by a vibration source, the interior of the whole device is kept stable, and the stress is balanced. The springs mounted at the bottom of the at least four power generation cells 105 in the horizontal, vertical direction are all in a slightly compressed state when at rest due to the repulsive forces from the annular permanent magnet 102 in the respective directions. The structure enables the vibration source from any direction to be excited, all the power generation units 105 can be displaced in the corresponding direction, and then electric energy is finally generated, and vibration energy in the working environment is effectively collected.
The three components of each power generation unit 105 of the device can convert the vibration energy in the working environment into electric energy, and the device can effectively collect and utilize the vibration energy in multiple directions and wide frequency bands widely existing in the working environment.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a windmill shape multi-direction broadband piezoelectricity electromagnetism vibration energy collection device which characterized in that: the vibration source control device comprises a support column (101) connected with a vibration source, an outer wheel shell (103) with the bottom connected with a CTS type spring vibration isolator (104), an annular permanent magnet (102) with an inner ring magnetized in a radiation mode and at least four power generation units (105), wherein one end, far away from the outer wheel shell (103), of the CTS type spring vibration isolator (104) is connected with the vibration source, the annular permanent magnet (102) is arranged on the support column (101), the center of the annular permanent magnet (102) is overlapped with the circle center of the outer wheel shell (103), and the at least four power generation units (105) are arranged in a groove in the inner surface of the outer wheel shell (103) at equal angles around the center of the annular permanent magnet (102);
the power generation unit (105) comprises a permanent magnet spring combination beam assembly and a PVDF piezoelectric beam assembly;
the permanent magnet and spring combined beam assembly comprises an upper cross beam (205), a lower cross beam (206), an upper end permanent magnet (201) and a first collision block (203) at the bottom of the upper cross beam, a lower end mass block (202) and a second collision block (204) at the top of the lower cross beam, a pair of linear-arched combined beams (207) which are symmetrical according to a central axis, a pair of PVDF piezoelectric thin film materials (208), a pair of upper disc supports (209), a pair of lower disc supports (210), a pair of lower end permanent magnets (211), a pair of springs and guide rods (212) of the springs, wherein the PVDF piezoelectric thin film materials (208) are flatly attached to the linear-arched combined beams (207), the upper end and the lower end of each linear-arched combined beam (207) are respectively connected with the upper cross beam (205) and the lower cross beam (206), the bottom ends of the linear-arched combined beams are connected with the upper disc supports (209), the lower end permanent magnets (211) are fixed by the upper disc supports (209) and the lower disc supports (210), the lower disc supports (210) are connected with the springs and the guide rods (212), the bottom ends of the springs and the bottom ends of the springs and guide rods (212) are fixed on the inner surface of the outer wheel shell (103), the upper cross beam (205), the upper end permanent magnet (201) is arranged on the upper cross beam (206);
the PVDF piezoelectric beam assembly comprises an upper frame (301), a lower frame (302), a conductive strut (303), a PVDF piezoelectric beam (306), a propelling block (307) and a locking bolt (309), wherein the upper frame (301) and the lower frame (302) are in a hollow rectangular structure in a shape of Chinese character 'hui' when viewed from top, the propelling block (307) is arranged between the upper frame (301) and the lower frame (302) and can move back and forth along the direction parallel to the surfaces of the upper frame and the lower frame, the locking bolt (309) is in threaded connection with the upper frame (301) and corresponds to the propelling block (307), one end of the PVDF piezoelectric beam (306) is clamped by the upper frame (301) and the lower frame (302), the other end of the PVDF piezoelectric beam is clamped in a gap on the inner side of the propelling block (307), and the lower frame (302) is connected with the inner surface of an outer wheel shell (103) through the conductive strut (303);
the first impact block (203) and the second impact block (204) correspond to the upper surface and the lower surface of the PVDF piezoelectric beam (306) respectively;
the PVDF piezoelectric beam assembly further comprises a pair of a first hollow coil (304) and a second hollow coil (305), the first hollow coil (304) and the second hollow coil (305) are multilayer coils, the number of turns is 1250, each layer of coil is a single-phase concentric winding planar coil, an insulating isolation material is arranged between each layer of coil, the first hollow coil (304) and the second hollow coil (305) are of a circular hollow structure, the coils are adjacently arranged around the axes of the coils, the first hollow coil (304) and the second hollow coil (305) are respectively fixed to the lower portions of the two conductive struts (303), and the first hollow coil (304) and the second hollow coil (305) respectively surround the lower portions and the lower portions of 1/2 of the two lower-end permanent magnets (211);
the annular permanent magnet (102) is magnetized in an inner ring radiation magnetizing mode, the inner surface of the ring is an S pole, and the outer surface of the ring is an N pole.
2. The windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device according to claim 1, wherein: the upper frame (301) and the lower frame (302) are connected and fastened through fixing bolts (308) which are in threaded connection at four corners of the upper frame (301).
3. The windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device according to claim 1, wherein: the mass of the upper end permanent magnet (201) and the mass of the lower end mass block (202) of each power generation unit (105) are the same or different.
4. The windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device according to claim 1, wherein: the magnetic pole of the upper end permanent magnet (201) of each power generation unit (105) is an upper surface N pole, namely the same as the magnetic pole of the outer surface of the annular permanent magnet (102) which is radially magnetized in the inner ring.
5. The windmill-shaped multidirectional broadband piezoelectric electromagnetic vibration energy collecting device according to claim 1, wherein: the annular permanent magnet (102), the upper end permanent magnet (201) and the lower end mass block (202) are all made of neodymium iron boron alloy.
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| US20090261689A1 (en) * | 2008-04-22 | 2009-10-22 | Honeywell International Inc. | System and method for providing a piezoelectric electromagnetic hybrid vibrating energy harvester |
| CN214591210U (en) * | 2021-04-28 | 2021-11-02 | 浙江理工大学 | Annular broadband piezoelectric electromagnetic vibration energy collecting device |
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| US20090261689A1 (en) * | 2008-04-22 | 2009-10-22 | Honeywell International Inc. | System and method for providing a piezoelectric electromagnetic hybrid vibrating energy harvester |
| CN214591210U (en) * | 2021-04-28 | 2021-11-02 | 浙江理工大学 | Annular broadband piezoelectric electromagnetic vibration energy collecting device |
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