CN213817619U - Piezoelectric power generation device - Google Patents
Piezoelectric power generation device Download PDFInfo
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- CN213817619U CN213817619U CN202120054325.3U CN202120054325U CN213817619U CN 213817619 U CN213817619 U CN 213817619U CN 202120054325 U CN202120054325 U CN 202120054325U CN 213817619 U CN213817619 U CN 213817619U
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- 238000010248 power generation Methods 0.000 title claims abstract description 63
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910001369 Brass Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000010951 brass Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
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- 230000006855 networking Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The utility model discloses a piezoelectric power generation device, including outer lane, inner circle and piezoelectric power generation group. At least two groups of magnets are uniformly arranged on the inner surface of the side wall of the outer ring along the circumferential direction, and at least two groups of magnets are uniformly arranged on the surface of the inner column along the circumferential direction; a through rocker movable groove is formed in the circumferential direction on the side wall of the outer ring; a rocker is arranged on the inner ring, and the rocker extends out of the outer ring from the inner ring through a rocker movable groove; the inner ring is provided with at least two groups of piezoelectric power generation sets along the circumferential direction, each piezoelectric power generation set comprises a piezoelectric component, the piezoelectric components are fixedly connected to the inner ring, one end of each piezoelectric component faces towards the inner surface of the side wall of the outer ring, and the other end of each piezoelectric component faces towards the inner column. The external environment transmits low-frequency vibration to the piezoelectric power generation device through the rocker, and the piezoelectric power generation device uses the matching of the multiple groups of piezoelectric components on the inner ring and the multiple groups of magnets on the outer ring to realize high-frequency vibration power generation of the piezoelectric components so as to improve the power generation efficiency.
Description
Technical Field
The utility model belongs to the power generation facility field, concretely relates to piezoelectricity power generation facility.
Background
In order to realize self-power supply of a wireless sensor for monitoring the marine environment, numerous scholars at home and abroad propose a method for converting wave energy into electric energy by utilizing an electromagnetic induction law, a piezoelectric effect and a triboelectric effect so as to supply power to the wireless sensor, and design various small power generation devices. Most of the devices adopt a resonance type mechanical structure, for example, an electromagnetic power generation device, and a magnet vibrates in a reciprocating manner under the driving of waves to cut a magnetic induction line so as to generate induced electromotive force in a coil. Such resonant power generation devices achieve maximum output power when the external excitation frequency is equal to their own natural frequency.
The existing resonance type generating device can generate larger output power when the external excitation frequency is equal to the natural frequency of the existing resonance type generating device, namely, the existing resonance type generating device reaches a resonance state. However, the operating frequency range is very narrow, and the resonant power generation device can normally operate only in a narrow frequency range near the natural frequency. For most power generation devices based on environmental vibrations, the natural frequency of the power generation device itself is much higher than the frequency of the environmental vibrations. According to a theoretical formula, the output power of the power generation device is proportional to the third power of the working frequency of the power generation device. This means that the output power of the power plant will drop sharply when the excitation frequency of the external environment decreases. In order to make the output power as large as possible, the natural frequency of the power generation device must be close to the ambient vibration frequency. The environmental vibrations are low frequency vibrations, typically in the frequency range of 1-20Hz, the frequency of the waves is less than 5Hz, and in order to keep the natural frequency of the power plant in its vicinity, the overall size of the power plant must be increased, since, in general, the natural frequency of the power plant is inversely proportional to its overall size. However, the increase in the volume of the power generation device greatly reduces the output power density (the ratio of the output power to the working volume), and also causes a series of problems such as an increase in the manufacturing cost and an increase in the difficulty of installation.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a piezoelectric power generation device, external environment (for example wave) transmit low frequency vibration to piezoelectric power generation device through the rocker, and piezoelectric power generation device uses the cooperation of the multiunit magnet of interior epaxial multiunit piezoelectric assembly of circle and outer lane, realizes piezoelectric assembly's high frequency vibration electricity generation to improve the generating efficiency.
In order to solve the technical problem, the utility model discloses a following technical scheme:
a piezoelectric power generation device comprises an outer ring, an inner ring and a piezoelectric power generation set; wherein,
the outer ring is of a cylindrical structure with one open end, and the inner wall of the bottom of the outer ring is provided with a rotating groove and an inner column arranged at the center of the inner wall of the bottom; at least two groups of magnets are uniformly arranged on the inner surface of the side wall of the outer ring along the circumferential direction, and at least two groups of magnets are uniformly arranged on the surface of the inner column along the circumferential direction; a through rocker movable groove is formed in the circumferential direction on the side wall of the outer ring;
a rocker is arranged on the inner ring, and the rocker extends out of the outer ring from the inner ring through a rocker movable groove; the edge of the inner ring is provided with a rectangular convex edge, and the rectangular convex edge is matched with the rotating groove of the outer ring so that the outer ring and the inner ring can rotate relatively;
the inner ring is provided with at least two groups of piezoelectric power generation sets along the circumferential direction, each piezoelectric power generation set comprises a piezoelectric component, the piezoelectric components are fixedly connected to the inner ring, one end of each piezoelectric component faces towards the inner surface of the outer wall of the outer ring, and the other end of each piezoelectric component faces towards the inner column.
In one embodiment, the piezoelectric element includes a cantilever beam, a piezoelectric sheet and two magnets, the piezoelectric sheet is attached to the cantilever beam, and the two magnets are respectively fixed at two ends of the cantilever beam.
In a specific embodiment, a rectangular groove is formed in the inner ring, and the middle position of the cantilever beam of the piezoelectric assembly is fixedly connected to the rectangular groove of the inner ring.
In a specific embodiment, the number of the piezoelectric sheets of the piezoelectric component is 4, and the 4 piezoelectric sheets are symmetrically attached to the upper and lower surfaces of the cantilever beam along the middle position of the cantilever beam.
In one embodiment, the polarities of the opposite end faces of the magnets of the piezoelectric assembly and the magnets of the outer ring are the same.
In a specific embodiment, each piezoelectric power generation set includes three piezoelectric components, and the three piezoelectric components are arranged along a radial direction of the inner ring.
In one embodiment, each set of magnets on the outer ring at the rocker active slot comprises two magnets and each other set of magnets comprises three magnets.
In one embodiment, the circumferential angle of the rocker active slot is 90 degrees.
In one embodiment, the outer ring has three sets of magnets on the inner surface of the side wall, and the inner post has three sets of magnets on the surface.
Adopt the utility model discloses following beneficial effect has:
1. the up-and-down motion of the waves is converted into the rotary motion of the inner ring (rotor) by the float and the rocker.
2. The cantilever beam and the piezoelectric sheet are arranged on the inner side and the outer side of the inner ring (rotor), so that the output power density is improved.
3. The multiple groups of piezoelectric components on the inner ring are matched with the multiple groups of magnets on the outer ring to form a frequency raising mechanism, the cantilever beams are driven to freely vibrate by the mutual acting force between the magnets, and then the cantilever beams vibrate at higher frequency to generate electricity.
4. Piezoelectric sheets are uniformly distributed on the upper surface and the lower surface of the cantilever beam, and the deformation of the cantilever beam is fully utilized to generate electricity according to the piezoelectric effect.
Drawings
FIG. 1 is a schematic diagram of a piezoelectric power generation system;
FIG. 2 is a schematic view of a piezoelectric power generation device;
fig. 3 is an exploded view of the piezoelectric power generating device;
FIG. 4 is a structural and exploded view of a piezoelectric assembly;
FIG. 5 is a schematic diagram of the operation of the piezoelectric power generator;
fig. 6 is a schematic diagram of the operation of the piezoelectric element.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1 to 6, the utility model discloses a piezoelectric power generation device, this piezoelectric power generation device can be used to catch the power generation system (being piezoelectric power generation system) of wave energy, and this power generation system includes float 1, piezoelectric power generation device 30, stand and base 4, and float 1 passes through rocker 2 to be connected in piezoelectric power generation device 30, and piezoelectric power generation device 30 is fixed in base 4 through the stand.
The piezoelectric power generation device 30 comprises an outer ring 3, an inner ring 4 and a piezoelectric power generation set 6, wherein the outer ring 3 is provided with a rectangular rocker movable groove 31 with a central angle of 90 degrees along the circumferential direction, the rocker 2 can swing up and down along the rocker movable groove 31, and the rocker 2 penetrates through the outer ring 3, extends to the inner ring 4 and is fixedly connected with the inner ring. When the rocker 2 swings up and down, the inner ring 4 and the outer ring 3 rotate relatively.
The inner wall of the bottom of the outer ring 3 is provided with a rotating groove 32, and the rotating groove 32 and a plurality of saw-shaped convex edges 41 arranged on the edge of the inner ring 4 are mutually matched to form a rotating pair, so that the outer ring 3 and the inner ring 4 can rotate relatively. An inner column 5 is arranged at the right center of the inner wall of the bottom of the outer ring 3, and the inner column 5 is fixedly connected with the inner wall of the bottom of the outer ring 3.
The outer ring 3 is cylindrical, and magnet sets are embedded on the inner surface of the side wall of the outer ring 3 and the surface of the inner column 5. In an embodiment, 12 sets of magnet groups are uniformly distributed on the inner surface of the side wall of the outer ring 3 along the circumferential direction at a central angle of 30 degrees, wherein each set of magnet groups except for only two magnets is provided at the rocker moving groove 31, and each other set of magnet groups is provided with three magnets. Interior post 5 is on the surface along circumference interval 60 degrees central angle evenly distributed 6 groups of magnet group, and every group magnet group all has 3 magnets.
The inner ring 4 is in a thin-wall cylindrical shape, 6 groups of rectangular grooves 7 are uniformly formed in the circumferential direction of the inner ring 4 (the interval central angle is 60 degrees), each group is provided with 3 rectangular grooves 7 which are arranged along the radial direction of the inner ring 4, and correspondingly, 3 piezoelectric assemblies 8 which are arranged in the radial direction form a piezoelectric power generation group 6. One piezoelectric assembly 8 forms fixed connection fit with the inner ring 4 through the rectangular groove 7, namely the middle part of the power generation assembly 8 forms interference fit with the rectangular groove 7. The piezoelectric assemblies 8 correspond to the rectangular grooves 7 one by one, and 6 groups of piezoelectric assemblies 8, namely 18 piezoelectric assemblies, are arranged on the inner ring 4.
The piezoelectric assembly 8 includes a cantilever beam 81 (brass foil may be used), 4 piezoelectric patches 82 and two magnets 83. The cantilever beam 81 is a brass sheet with the thickness of 0.4mm, the middle part of the cantilever beam 81 is fixedly connected with the rectangular groove 7 of the inner ring 4, two free ends of the cantilever beam 81 are respectively provided with a magnet 83, and 4 piezoelectric sheets 82 are symmetrically adhered to the upper surface and the lower surface of the cantilever beam 81 along the middle position.
The utility model discloses the theory of operation of piezoelectric power generation system, as follows. When the floater 1 vibrates up and down along with waves, the rocker 2 is driven to swing up and down, so that the inner ring 4 and the outer ring 3 rotate relatively. The piezoelectric generator unit 6 mounted on the inner ring 4 has a small gap with the inner surface of the side wall of the outer ring 3, and the piezoelectric generator unit 6 and the surface of the inner column 5. When the inner ring 4 and the outer ring 3 rotate relatively, the magnets 83 at the two ends of the cantilever beam 81 interact with the magnets on the inner surface of the side wall of the outer ring 3 and the magnets on the inner column 5, respectively. Under the action of magnetic force, the cantilever beam 81 deforms, so that the piezoelectric sheet 82 attached to the surface of the cantilever beam 81 deforms accordingly. According to the positive piezoelectric effect, the piezoelectric sheet under pressure (or tension) outputs electric energy.
The specific vibration power generation process of the piezoelectric assembly 8 is as follows. When the inner ring 4 and the outer ring 3 rotate relatively, the magnet 33 on the outer ring 3 vibrates up and down with respect to the magnet 83 of the piezoelectric element 8. When the magnet 33 on the outer ring 3 approaches the magnet 83 on the cantilever 81, an interaction force is generated between the magnets, and the interaction force drives the cantilever 81 to bend. As the magnet 83 continues relative movement away from the cantilever beam, the force is reduced and the cantilever beam 81 is released. Cantilever beam 81 after being released is free to vibrate at its natural frequency. The rocking frequency of the rocking bar 2 is equal to the frequency of the wave motion, which is usually very low (<5Hz), but in the rocking process of the rocking bar 2, the cantilever beam 81 can freely vibrate at its natural frequency after being shifted by the magnet 33 on the outer ring 3 every time, and the natural frequency is far higher than the wave frequency and can reach hundreds of Hz. Therefore, the frequency is improved, and finally the output power and the energy conversion efficiency of the piezoelectric power generation device can be improved.
Piezoelectric power generation system, can realize the conversion of wave energy-electric energy high-efficiently, can replace the battery that is used for marine environment monitoring's wireless sensor, avoided the battery to change and the trouble of recharging, provide huge help for the establishment of marine thing networking.
A piezoelectricity power generation system for catching wave energy, can understand two vibration systems of establishing ties, one is low frequency vibration system (float end), another is high frequency vibration system (piezoelectricity power generation facility end). The low-frequency vibration system can transmit low-frequency environment (wave) vibration to the high-frequency vibration system, and the high-frequency vibration system converts the vibration energy into electric energy by using an electromechanical conversion mechanism. The introduction of such an up-conversion structure brings about two fundamental advantages: firstly, the vibration frequency for power generation is greatly improved, and the output power density is directly increased; and secondly, the natural frequency of the power generation device can be close to the environmental vibration frequency under the condition of not increasing the overall size of the power generation device.
Furthermore, the utility model discloses the electromechanical conversion mechanism that adopts is the piezoelectricity effect (when the piezoelectric patches takes place deformation, polarization phenomenon can take place to inside to produce the electromotive force), and this kind of piezoelectric power generation device compares in traditional electromagnetic power generation device can more fully utilize the characteristics of the big amplitude of wave energy low frequency and accomplish the conversion of electric energy more high-efficiently. Since the output power of the electromagnetic generating device is proportional to the change rate of the magnetic induction line inside the coil, i.e., proportional to the moving speed of the magnet, according to the faraday's law of electromagnetic induction, the frequency of the wave has a large influence thereon and the amplitude of the wave has a small influence thereon, which cannot exert the advantage of the large amplitude of the wave. And the utility model discloses a piezoelectric power generation device, the big amplitude of wave will directly lead to the vibration number of times of piezoelectric patches to increase, therefore the frequency and the amplitude of wave all influence power generation device's electric energy output.
The utility model discloses to the problem of the wave energy electricity generation difficulty of the big amplitude of low frequency, combine together the mechanism of raising the frequency with the electromechanical conversion mechanism based on piezoelectric effect, improved the conversion efficiency of electric energy, also improved output density. Realize the self-power for marine electronic devices such as wireless sensor for marine environment monitoring, the utility model discloses very big application potential has.
It is to be understood that the exemplary embodiments described herein are illustrative and not restrictive. While one or more embodiments of the present invention have been illustrated in the accompanying drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. The piezoelectric power generation device is characterized by comprising an outer ring, an inner ring and a piezoelectric power generation set; wherein,
the outer ring is of a cylindrical structure with one open end, and the inner wall of the bottom of the outer ring is provided with a rotating groove and an inner column arranged at the center of the inner wall of the bottom; at least two groups of magnets are uniformly arranged on the inner surface of the side wall of the outer ring along the circumferential direction, and at least two groups of magnets are uniformly arranged on the surface of the inner column along the circumferential direction; a through rocker movable groove is formed in the circumferential direction on the side wall of the outer ring;
a rocker is arranged on the inner ring, and the rocker extends out of the outer ring from the inner ring through a rocker movable groove; the edge of the inner ring is provided with a rectangular convex edge, and the rectangular convex edge is matched with the rotating groove of the outer ring so that the outer ring and the inner ring can rotate relatively;
the inner ring is provided with at least two groups of piezoelectric power generation sets along the circumferential direction, each piezoelectric power generation set comprises a piezoelectric component, the piezoelectric components are fixedly connected to the inner ring, one end of each piezoelectric component faces towards the inner surface of the outer wall of the outer ring, and the other end of each piezoelectric component faces towards the inner column.
2. The piezoelectric power generation device according to claim 1, wherein the piezoelectric element includes a cantilever beam, a piezoelectric sheet attached to the cantilever beam, and two magnets fixed to both ends of the cantilever beam, respectively.
3. The piezoelectric power generator according to claim 2, wherein the inner ring is provided with a rectangular groove, and the cantilever beam of the piezoelectric element is fixedly connected to the rectangular groove of the inner ring at a middle position thereof.
4. The piezoelectric power generation device according to claim 3, wherein the number of the piezoelectric sheets of the piezoelectric element is 4, and the 4 piezoelectric sheets are symmetrically attached to the upper and lower surfaces of the cantilever beam along the middle position of the cantilever beam.
5. The piezoelectric power generator according to claim 4, wherein the magnets of the piezoelectric element have the same polarity as the magnet-opposed end faces of the outer ring.
6. The piezoelectric power generating apparatus according to claim 1, wherein each of the piezoelectric power generating groups includes three of the piezoelectric elements, and the three piezoelectric elements are arranged in a radial direction of the inner ring.
7. The piezoelectric power generator of claim 6, wherein each set of magnets on the outer ring at the rocker active slot comprises two magnets and each other set of magnets comprises three magnets.
8. The piezoelectric power generating apparatus according to claim 1, wherein the rocker arm movable groove has a circumferential angle of 90 degrees.
9. The piezoelectric power generator of claim 1, wherein the outer ring has three sets of magnets on the inner surface of the side wall, and the inner post has three sets of magnets on the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120054325.3U CN213817619U (en) | 2021-01-11 | 2021-01-11 | Piezoelectric power generation device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120054325.3U CN213817619U (en) | 2021-01-11 | 2021-01-11 | Piezoelectric power generation device |
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| CN213817619U true CN213817619U (en) | 2021-07-27 |
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| CN202120054325.3U Expired - Fee Related CN213817619U (en) | 2021-01-11 | 2021-01-11 | Piezoelectric power generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737411A (en) * | 2021-01-11 | 2021-04-30 | 浙大宁波理工学院 | Piezoelectric power generation device |
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- 2021-01-11 CN CN202120054325.3U patent/CN213817619U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112737411A (en) * | 2021-01-11 | 2021-04-30 | 浙大宁波理工学院 | Piezoelectric power generation device |
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Granted publication date: 20210727 Termination date: 20220111 |