CN214591210U

CN214591210U - Annular broadband piezoelectric electromagnetic vibration energy collecting device

Info

Publication number: CN214591210U
Application number: CN202120895843.8U
Authority: CN
Inventors: 许冠华; 赵新龙; 赵祥
Original assignee: Zhejiang Sci Tech University ZSTU
Current assignee: Zhejiang Sci Tech University ZSTU
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-11-02
Anticipated expiration: 2031-04-28

Abstract

The utility model provides an annular broadband piezoelectricity electromagnetic vibration energy collection device relates to the new forms of energy field, be connected with the outer wheel shell of CTS type spring isolator, inner circle radiation ring permanent magnet and four at least generating unit that magnetize including pillar, the bottom of connecting the vibration source, the one end that the outer wheel shell was kept away from to CTS type spring isolator is connected the vibration source, ring permanent magnet sets up on the pillar, the center of ring permanent magnet and the coincidence of the centre of a circle of outer wheel shell, four at least generating unit is around angle settings such as ring permanent magnet center in the internal surface recess of outer wheel shell. The device 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 invention can be applied in a wide range of occasions, and can effectively collect vibration energy in a working environment even if multidirectional and multi-frequency vibration exists in the working environment.

Description

Annular broadband piezoelectric electromagnetic vibration energy collecting device

Technical Field

The utility model relates to a new forms of energy technical field specifically is an annular broadband piezoelectricity electromagnetic vibration energy collection 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 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 uninterruptedly, so that a key factor restricting the technical development of the internet of things 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 research various energy collecting devices, including a multi-frequency energy collector, a three-axis ball piezoelectric device, an omnidirectional impact energy collecting device, a cube-mass block structure, a three-degree-of-freedom array type, a linear-arch combination 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 environments 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 environments is a difficult problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

Not enough to prior art, the utility model provides an annular broadband piezoelectricity electromagnetic vibration energy collection device has solved the problem of proposing in the above-mentioned background art.

(II) technical scheme

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides an annular broadband piezoelectricity electromagnetism vibration energy collection device, is connected with the outer wheel shell, the inner circle radiation that CTS type spring isolator magnetizes annular permanent magnet and four at least generating unit including the pillar, the bottom of connecting the source of shaking, the source of shaking is connected to the one end that outer wheel shell was kept away from to CTS type spring isolator, annular permanent magnet sets up on the pillar, the center of annular permanent magnet and the centre of a circle coincidence of outer wheel shell, at least four generating unit is around the interior surface recess of annular permanent magnet center equipartition setting in the outer wheel shell, generating unit includes permanent magnet spring combination beam subassembly and PVDF piezoelectricity beam subassembly.

Preferably, the permanent magnet-spring combination beam assembly comprises an upper cross beam, a lower cross beam, an upper permanent magnet, an impact block at the bottom of the upper permanent magnet, a lower mass block, an impact block at the top of the lower mass block, a pair of linear-arched combination beams 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 combination beams, the upper ends and the lower ends of the linear-arched combination beams are respectively connected with the upper cross beam and the lower cross beam, the bottom ends of the linear-arched combination beams are connected with the upper disc supports, the lower permanent magnets are fixed by 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 the outer wheel shell, and the upper permanent magnet is arranged on the upper cross beam, the lower end mass block is arranged on the lower cross beam.

Preferably, the PVDF piezoelectric beam assembly includes an upper frame, a lower frame, a conductive pillar, a PVDF piezoelectric beam, a propulsion block, and a locking bolt, the upper frame and the lower frame are in a hollow rectangular structure in a shape like a Chinese character 'hui', the propulsion block is disposed between the upper frame and the lower frame and can move back and forth along a direction parallel to the surface of the upper frame and the lower frame, the locking bolt is in threaded connection with the upper frame and corresponds to the propulsion 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 clamped in a gap inside the propulsion block, the lower frame is connected with the inner surface of the outer wheel shell through the conductive pillar, and 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 multilayer coil, and the number of turns is 1250, and every layer coil is single-phase concentric winding plane coil, has insulating barrier material between every layer coil, hollow coil one, hollow coil two are circular hollow structure, and the coil is around 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 are respectively around the latter half and below two lower extreme permanent magnets 1/2.

Preferably, the annular permanent magnet is magnetized by adopting an inner ring radiation magnetizing manner, the inner surface of the ring is an S pole, the outer surface of the ring is an N pole, and the magnetic pole of the permanent magnet at the upper end of each power generation unit is an upper surface N pole, that is, the magnetic pole is the same as the magnetic pole of the outer surface of the annular permanent magnet which is magnetized by the inner ring radiation.

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 part of the 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.

(III) advantageous effects

The utility model provides an annular broadband piezoelectricity electromagnetic vibration energy collection device. The method has the following beneficial effects:

1. the annular broadband piezoelectric electromagnetic vibration energy collecting device can make up 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 existing vibration energy collecting technology; the invention can be applied in a wide range of occasions, and can effectively collect vibration energy in a working environment even if multidirectional and multi-frequency vibration exists in the working environment.

Drawings

Fig. 1 is a front view of the present invention;

FIG. 2 is a schematic view of a power generation unit 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 utility model provides an annular broadband piezoelectricity electromagnetic vibration energy collection device, as shown in fig. 1-3, including connecting the pillar 101 of the source of shaking, the bottom is connected with CTS type spring isolator 104's foreign steamer shell 103, inner circle radiation magnetizes annular permanent magnet 102 and four at least generating unit 105, CTS type spring isolator 104 keeps away from the one end of foreign steamer shell 103 and connects the source of shaking, annular permanent magnet 102 sets up on pillar 101, annular permanent magnet 102's center and foreign steamer shell 103's centre of a circle coincidence, four at least generating unit 105 around annular permanent magnet 102 center equiangular settings in the internal surface recess of foreign steamer shell 103.

The power generation unit 105 includes a permanent magnet spring composite beam assembly and a PVDF piezoelectric beam assembly.

The permanent magnet spring combination 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 combination 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 combination beams 207, the upper end and the lower end of the linear-arch combination beams 207 are respectively connected with the upper cross beam 205 and the lower cross beam 206, the bottom ends of the upper disc supports 209 and the lower disc supports 210 are fixed, 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, lower terminal mass 202 is disposed on lower cross member 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 and second impact masses 203 and 204 correspond to the deepest part of the depression of the PVDF piezoelectric beam 306 up and down.

A second power generation assembly: because the initial state of the PVDF piezoelectric beam 306 is adjusted to be convex upwards by the pushing block 307, the whole permanent magnet-spring combined beam structure is forced to move downwards while the upper end permanent magnet 201 is subjected to a downward repulsive force, 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 an 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 of the PVDF piezoelectric beam 306, the state is continuously converted from convex to concave and from concave to convex, and the cycle 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 axes 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 support columns 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 entire permanent magnet-spring combination beam structure is also subjected to a downward displacement, and the second part is fixed below the conductive support 303, and a pair of the first hollow coil 304 and the 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

1. The utility model provides an annular broadband piezoelectricity electromagnetism vibration energy collection device which characterized in that: the vibration source 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 inner ring radiating and magnetizing annular permanent magnet (102) and at least four power generation units (105), wherein the CTS-type spring vibration isolator (104) is far away from one end of the outer wheel shell (103) and 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 coincided with the circle center of the outer wheel shell (103) by 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), and the power generation units (105) comprise a permanent magnet spring combination beam assembly and a PVDF piezoelectric beam assembly.

2. The annular broadband piezoelectric electromagnetic vibration energy harvesting device of claim 1, wherein: 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), a first collision block (203) at the bottom of the upper cross beam, a lower end mass block (202), a second collision block (204) at the top of the lower cross beam, a pair of linear-arch combined beams (207) symmetrical according to a central axis, a pair of PVDF piezoelectric 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 film materials (208) are flatly attached to the linear-arch combined beams (207), the upper end and the lower end of each linear-arch combined beam (207) are respectively connected with the upper cross beam (205) and the lower cross beam (206), the bottom ends of the linear-arch combined beams are connected with the upper disc supports (209), and the lower end permanent magnets (211) are fixed by the upper disc supports (209) and the lower disc supports (210), the lower disc support (210) is connected with a spring and a guide rod (212) thereof, the bottom ends of the spring and the guide rod (212) thereof are fixed on the inner surface of the outer wheel shell (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).

3. The annular broadband piezoelectric electromagnetic vibration energy harvesting device of claim 2, wherein: 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), 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, the locking bolt (309) is connected with the upper frame (301) in a threaded manner and corresponds to the pushing 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 is arranged in a gap on the inner side of the pushing block (307) to be clamped, the lower frame (302) is connected to the inner surface of the outer wheel casing (103) via conductive posts (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.

4. The annular broadband piezoelectric electromagnetic vibration energy harvesting device of claim 3, wherein: PVDF piezoelectric beam subassembly still includes a pair of hollow coil one (304), hollow coil two (305), hollow coil one (304), hollow coil two (305) are multilayer coil, and the number of turns is 1250, and every layer coil is single-phase concentric winding plane coil, has insulating barrier material between every layer coil, hollow coil one (304), hollow coil two (305) are circular hollow structure, and the coil is around its axle center adjacent row, the lower part at two electrically conductive pillars (303) is fixed respectively to hollow coil one (304), hollow coil two (305), the lower half that surrounds two lower extreme permanent magnets (211)1/2 respectively and below hollow coil one (304), hollow coil two (305).

5. The annular broadband piezoelectric electromagnetic vibration energy harvesting device of claim 1, wherein: the annular permanent magnet (102) is magnetized in an inner ring radiation magnetizing mode, the inner surface of the ring is an S pole, the outer surface of the ring is an N pole, and the magnetic pole of the upper end permanent magnet (201) of each power generation unit (105) is an upper surface N pole, namely the magnetic pole is the same as the magnetic pole of the outer surface of the annular permanent magnet (102) which is magnetized in an inner ring radiation mode.

6. The annular broadband piezoelectric electromagnetic vibration energy harvesting device of claim 3, wherein: the utility model discloses a PVDF piezoelectric beam's structure, including upper end permanent magnet (201) and lower extreme quality piece (202), the intermediate position of upper end permanent magnet (201) and lower extreme quality piece (202) fixed respectively in upper end crossbeam (205) and lower crossbeam (206), collision piece one (203) sets up the lower surface central point in upper end permanent magnet (201), collision piece two (204) set up the central point in the upper surface of lower extreme quality piece (202), collision piece one (203), collision piece two (204) correspond from top to bottom with the sunken deepest of PVDF piezoelectric beam (306).

7. The annular broadband piezoelectric electromagnetic vibration energy harvesting device of claim 3, wherein: the lower cross beam (206) is provided with two small holes at symmetrical positions near two sides of the lower end mass block (202), and the small holes are used for penetrating through the conductive support columns (303).