CN108448938B - Circular arc piezoelectric type energy collector with cross-linked net - Google Patents
Circular arc piezoelectric type energy collector with cross-linked net Download PDFInfo
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- CN108448938B CN108448938B CN201810409222.7A CN201810409222A CN108448938B CN 108448938 B CN108448938 B CN 108448938B CN 201810409222 A CN201810409222 A CN 201810409222A CN 108448938 B CN108448938 B CN 108448938B
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- 239000000463 material Substances 0.000 claims description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000004088 simulation Methods 0.000 abstract description 2
- 241000446313 Lamella Species 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 230000010354 integration Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/186—Vibration harvesters
- H02N2/188—Vibration harvesters adapted for resonant operation
Abstract
The invention discloses a cross-linked network arc piezoelectric energy collector, which comprises a first main cantilever Liang Jiban fixed end and a second main cantilever Liang Jiban fixed end, wherein at least three groups of cantilever beams are arranged in parallel between the first main cantilever Liang Jiban fixed end and the second main cantilever Liang Jiban fixed end. One end of each group of cantilever beams is connected with the fixed end of the first main cantilever Liang Jiban, and the other end of each group of cantilever beams is connected with the fixed end of the second main cantilever Liang Jiban. And each group of cantilever beams are symmetrical about the central axis, and each group of cantilever beams consists of three cantilever beam pairs. The cantilever beam pairs of the cross-linked network circular arc type piezoelectric energy collector are connected symmetrically in the transverse direction and are also cascaded in the longitudinal direction, the first-order resonant frequency of the collectable energy is further reduced, the effective working frequency band is widened, and meanwhile, the multi-order bandwidth of the collectable energy is found according to simulation results to be greatly shortened.
Description
Technical Field
The invention relates to a cross-linked network arc piezoelectric energy collector, and belongs to the technical field of energy collection.
Background
The piezoelectric energy collector is based on the piezoelectric effect of the piezoelectric material, and under the excitation of the environmental vibration, the piezoelectric layer in the device generates strain, and polarization charge is generated on the surface, so that the mechanical energy of the environmental vibration is converted into the required electric energy. The piezoelectric energy collector commonly used at present is usually in a straight structure, and the piezoelectric energy collector can play a role in energy collection under the structure, but experiments show that the frequency range of the collectable energy is smaller, and the output potential is lower. In addition, the piezoelectric energy collector with the straight structure has a series of defects of low stability, low space utilization and the like.
The traditional single-arc piezoelectric energy collector outputs high potential under a specific radian by designing the cantilever beam into a certain arc shape, so that the vibration energy of the top surface can be absorbed, and the vibration energy of the side surface direction can be absorbed. Although the traditional high-performance arc piezoelectric energy collector can convert load into electric energy for output under a certain radian, the output potential of the traditional high-performance arc piezoelectric energy collector is obviously smaller under a certain additional load, the energy and space utilization rate is lower, and the stability problem is easily caused by the asymmetric structure.
The cross-linked circular arc piezoelectric energy collector connects the cantilever beams symmetrically, and compared with the traditional piezoelectric energy collector, the cross-linked circular arc piezoelectric energy collector has the characteristics of high output potential, high space utilization rate, good stability and the like, but the symmetrical connection of the cantilever beams is limited to the transverse direction, so that the energy collection range and the electric potential are limited.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a cross-linked network circular arc piezoelectric energy collector.
The aim of the invention is achieved by the following technical scheme: the utility model provides a cross-linked network circular arc formula piezoelectricity formula energy collector, includes first main cantilever Liang Jiban stiff end and second main cantilever Liang Jiban stiff end, parallel arrangement has at least three group's cantilever beam between first main cantilever Liang Jiban stiff end and the second main cantilever Liang Jiban stiff end.
Preferably, one end of each group of cantilever beams is connected with the fixed end of the first main cantilever Liang Jiban, and the other end of each group of cantilever beams is connected with the fixed end of the second main cantilever Liang Jiban.
Preferably, each group of the cantilever beams is symmetrical about the central axis, and each group of the cantilever beams consists of three cantilever beam pairs.
Preferably, three groups of cantilever beams are arranged in parallel between the fixed end of the first main cantilever Liang Jiban and the fixed end of the second main cantilever Liang Jiban, the first group of cantilever beams is composed of three pairs of cantilever beams, the second group of cantilever beams is composed of three pairs of cantilever beams, and the third group of cantilever beams is composed of three pairs of cantilever beams.
Preferably, the first group of cantilevers is composed of three pairs of cantilevers, and the first, second and third pairs of cantilevers are composed of symmetrical circular-arc-shaped sheets.
Preferably, the first pair of cantilever beams consists of a symmetrical first pair of circular arc thin sheets, the left ends of the first pair of circular arc thin sheets are fixed ends, and the right ends of the first pair of circular arc thin sheets are formed by connecting first square thin sheets; the second pair of cantilever beams consists of a second pair of symmetrical circular arc-shaped thin plates, the right ends of the second pair of circular arc-shaped thin plates are connected by a second square thin plate, and the left ends of the second pair of circular arc-shaped thin plates are connected to the right ends of the first pair of circular arc-shaped thin plates through a first square thin plate; the third pair of cantilever beams is composed of a symmetrical third pair of circular arc-shaped thin plates, and the left ends of the third pair of circular arc-shaped thin plates are connected to the right ends of the second pair of circular arc-shaped thin plates through second square thin plates.
Preferably, the first, second and third piezoelectric layers are respectively attached to the first, second and third pairs of circular arc-shaped sheets, and the first and second square sheets are attached with the first and second masses.
Preferably, the cantilever beam is made of phosphor bronze material.
Preferably, the first pair of circular arc-shaped sheets, the second pair of circular arc-shaped sheets and the third pair of circular arc-shaped sheets have an inner diameter of 20mm, an outer diameter of 30mm, a thickness of 0.5mm and a circular arc of 90 degrees.
Preferably, the first piezoelectric layer, the second piezoelectric layer and the third piezoelectric layer are PZT-5H; the inner diameter and the outer diameter of the first piezoelectric layer, the second piezoelectric layer and the third piezoelectric layer are respectively 20mm and 30mm, the thickness is 0.3mm, and the radian is 90 degrees.
Preferably, the first mass block and the second mass block are made of nickel materials, and the length, the width and the height of the first mass block and the second mass block are respectively 10mm, 10mm and 10mm.
The technical scheme of the invention has the advantages that:
compared with the traditional piezoelectric energy collector, the cross-linked network circular arc piezoelectric energy collector provided by the technical scheme has the advantages of low first-order resonant frequency, high output voltage in unit frequency band and good stability, and has the characteristics of easy integration and micromation.
Compared with the traditional cross-linked piezoelectric energy collector, the cross-linked network arc piezoelectric energy collector has the advantages that the cantilever beam pairs are connected symmetrically in the transverse direction and are also connected in the longitudinal direction in a cascading manner, the first-order resonant frequency of the collectable energy is further reduced, the effective working frequency band is widened, and meanwhile, according to simulation results, the multi-order bandwidth of the collectable energy is found to be greatly shortened. Therefore, the cross-linked network circular arc piezoelectric energy collector of the technical scheme can be well matched with a low-frequency multi-source vibration environment, and the broadband effect is better realized.
Compared with the traditional cross-linked piezoelectric energy collector, the cross-linked circular arc piezoelectric energy collector consists of nine pairs of cantilever beams which are transversely and longitudinally staggered and cascaded, wherein three pairs of transverse cantilever beams form a cantilever beam group. Each cantilever beam corresponds to one piezoelectric layer, under the condition that the mass block is not changed greatly, the cross-linked network circular arc type piezoelectric energy collector of the technical scheme further improves the space utilization rate, further improves the integration level of the integrated unit small module of the piezoelectric integrated chip, and outputs ultra-high voltage in a unit frequency band, namely, can provide wider working frequency band under the same voltage output requirement.
Compared with the traditional cross-linked piezoelectric energy collector, the cross-linked circular arc piezoelectric energy collector consists of nine completely symmetrical cantilever beams and piezoelectric layers attached to the cantilever beams, and has better stability.
Drawings
Fig. 1 is a schematic structural view of a cross-linked network circular arc type piezoelectric energy collector according to the present invention.
Fig. 2 is a top view of the geometry of the cross-linked network circular arc piezoelectric energy collector of the present invention.
Fig. 3 is a schematic diagram of the geometry of a cross-linked circular arc piezoelectric energy harvester.
FIG. 4 is a graph of voltage versus frequency for a cross-linked network circular arc piezoelectric energy harvester according to the present invention.
FIG. 5 is a graph of voltage versus frequency for a cross-linked circular arc piezoelectric energy harvester.
Detailed Description
The objects, advantages and features of the present invention are illustrated and explained by the following non-limiting description of preferred embodiments. These embodiments are only typical examples of the technical scheme of the invention, and all technical schemes formed by adopting equivalent substitution or equivalent transformation fall within the scope of the invention.
The invention discloses a cross-linked network arc piezoelectric energy collector, which comprises a first main cantilever Liang Jiban fixed end 1 and a second main cantilever Liang Jiban fixed end 2, wherein at least three groups of cantilever beams 3 are arranged in parallel between the first main cantilever Liang Jiban fixed end 1 and the second main cantilever Liang Jiban fixed end 2, as shown in fig. 1 and 2.
One end of each group of cantilever beams is connected with the fixed end 1 of the first main cantilever Liang Jiban, and the other end of each group of cantilever beams is connected with the fixed end 2 of the second main cantilever Liang Jiban. And each group of cantilever beams are symmetrical about the central axis, and each group of cantilever beams consists of three cantilever beam pairs.
Specifically, in this technical solution, three groups of cantilever beams are preferably disposed in parallel between the fixed end 1 of the first main cantilever Liang Jiban and the fixed end 2 of the second main cantilever Liang Jiban, and the fixed end 1 of the first main cantilever Liang Jiban and the fixed end 2 of the second main cantilever Liang Jiban are respectively connected with the three groups of cantilever beams. The first group of cantilever beams I consists of three pairs of cantilever beams, the second group of cantilever beams II consists of three pairs of cantilever beams, and the third group of cantilever beams III consists of three pairs of cantilever beams. The cantilevers Liang Zu, II and III are sequentially connected with the fixed end of the main cantilever Liang Jiban from top to bottom; from left to right, the first pair of cantilever beams consists of symmetrical first circular arc-shaped sheets, the piezoelectric layers are attached to the first circular arc-shaped sheets, the left ends of the sheets are fixed ends, the right ends of the sheets are formed by connecting first square sheets, the width W=10mm, and the thickness Hs=0.5 mm of the base layer.
The three groups of cantilever beams are supported by the main cantilever Liang Jiban to realize longitudinal cascade connection; the three cantilever beam pairs of each group of cantilever beams are transversely cascaded by the square thin sheet, and a cantilever beam network is formed by the connection mode. The cross-linked network circular arc type piezoelectric energy collector is characterized in that cantilever beams are respectively cascaded in the transverse direction and the longitudinal direction to form a symmetrical cantilever beam network which is connected in a staggered mode. The structure effectively improves the space utilization rate of the piezoelectric layer, and further enables the energy collector of the technical scheme to have higher output voltage, lower first-order resonant frequency, wider working frequency band and better stability.
The first group of cantilever beams I consists of three pairs of cantilever beams, each pair of cantilever beams is formed by connecting two completely symmetrical circular arc-shaped thin sheets and square thin sheets, and the first pair of cantilever beams 10, the second pair of cantilever beams 20 and the third pair of cantilever beams 30 consist of symmetrical circular arc-shaped thin sheets. The first pair of cantilever beams 10 consists of a symmetrical first pair of circular arc-shaped thin sheets 11, the left ends of the first pair of circular arc-shaped thin sheets are fixed ends 100, and the right ends of the first pair of circular arc-shaped thin sheets are connected by a first square thin sheet 12. The second pair of cantilever beams 20 consists of a symmetrical second pair of circular-arc shaped lamellae 21, the right ends of which are connected by a second square lamella 22, the left ends being connected to the right ends of the first pair of circular-arc shaped lamellae by a first square lamella. The third pair of cantilever beams 30 consists of a symmetrical third pair of circular-arc shaped lamellae 31, the left ends of which are connected to the right ends of the second pair of circular-arc shaped lamellae by means of a second square lamella 22. The length and width of the first square sheet and the second square sheet are lm=10mm and wm=10mm respectively.
The first, second and third piezoelectric layers 111, 211 and 311 are respectively attached to the first, second and third pairs of circular-arc-shaped sheets 11, 21 and 31, and the first and second masses 40 and 50 are attached to the first and second square sheets.
The cantilever beam is made of phosphor bronze material. The first pair of circular arc-shaped sheets, the second pair of circular arc-shaped sheets and the third pair of circular arc-shaped sheets are 20mm in inner diameter, 30mm in outer diameter, 0.5mm in thickness and 90 degrees in radian.
The first piezoelectric layer, the second piezoelectric layer and the third piezoelectric layer are PZT-5H; the inner diameter Ra and the outer diameter Rb of the first piezoelectric layer, the second piezoelectric layer and the third piezoelectric layer are respectively 20mm and 30mm, the thickness Hp is 0.3mm, and the arc-shaped piezoelectric layer with 90-degree radian is attached to the arc-shaped sheet with 90-degree radian.
The first mass block and the second mass block are made of nickel materials, and the length Lm, the width Wm and the height Hm of the first mass block and the second mass block are respectively 10mm, 10mm and 10mm. The first mass block and the second mass block are attached to the square sheet; when excitation acts on the mass, the circular arc-shaped piezoelectric layer is deformed, and electric potential is generated. The arc-shaped structure is adopted, so that the vibration energy of the top surface and the vibration energy of the side surface can be received, and a plurality of symmetrical cantilever beam pairs are respectively cascaded in the transverse direction and the longitudinal direction to form a cantilever beam network, so that the output voltage is further improved, the working bandwidth is enlarged, and meanwhile, the stability of the device is well improved.
The schematic structural diagram of the cross-linked circular arc piezoelectric energy collector is shown in fig. 3, and it can be seen that the cross-linked network circular arc piezoelectric energy collector is further optimized based on the cross-linked circular arc piezoelectric energy collector, and has higher stability, and by adding a plurality of pairs of cantilever beams to the transverse and longitudinal cascade network, the area of the energy collector which can receive vibration energy is expanded, and the working performance of the device is improved.
To further highlight the advantages of the cross-linked circular arc type, the broadband of the cross-linked circular arc type and the high output voltage, the output voltage of the cross-linked circular arc type and the cross-linked circular arc type piezoelectric energy collectors are plotted against the frequency of the collected energy, respectively, as shown in fig. 4 and 5, with the abscissa of fig. 4 representing the frequency, the ordinate representing the voltage, the abscissa of fig. 5 representing the frequency, and the ordinate representing the voltage. It is obvious that the cross-linked circular arc piezoelectric energy collector has the highest output potential of 0.64V at 44Hz, and the cross-linked circular arc piezoelectric energy collector has the highest output voltage of 0.83V at 22Hz, which also intuitively shows that the cross-linked circular arc piezoelectric energy collector of the technical scheme has wider working frequency band and more excellent energy collection performance.
With reference to fig. 2, the cross-linked network circular arc piezoelectric energy collector according to the present technical solution is composed of nine completely symmetrical cantilever beams and a piezoelectric layer attached to the cantilever beams, and has deeper symmetry, which makes the cross-linked network circular arc piezoelectric energy collector have better stability.
The cross-linked circular arc piezoelectric energy collector is an improvement based on the cross-linked circular arc piezoelectric energy collector, and the energy collector with the simplified structure is easier to miniaturize and integrate, so that the cross-linked circular arc piezoelectric energy collector has a larger research value. The cross-linked circular arc piezoelectric energy collector symmetrically connects a plurality of pairs of cantilever beams, and has the characteristics of high output potential, high space utilization rate, good stability and the like compared with the traditional piezoelectric energy collecting device. However, the symmetrical connection of the pairs of cantilevers is limited to the lateral direction only, so that the energy collection range and the electric potential are improved only to a limited extent. According to the cross-linked network circular arc type piezoelectric energy collector, identical cantilever beams are respectively cascaded in the transverse direction and the longitudinal direction, a cantilever beam network structure is built, the first-order resonance frequency of the energy collector is further reduced, the frequency range of energy collection is expanded, and meanwhile, the energy collector has higher output potential energy and better stability. In addition, the cross-linked net circular arc type piezoelectric energy collector creates a structure which is easy to process, simplifies a complex structure, is easy to integrate MEMS, has high performance at the same time, and is used as an integrated unit small module of a piezoelectric integrated chip. Therefore, the cross-linked net circular arc type piezoelectric energy collector of the technical scheme has higher research value.
In summary, the energy collector of the technical scheme adopts the cross-linked net arc structural design with a symmetrical structure. When excitation is applied to the mass, the transversely and longitudinally cascaded cantilever beams produce a higher potential at the circular arc piezoelectric energy collector of a particular arc. The double-track type arc energy collector not only can output ultrahigh potential, but also can improve the space utilization rate and the integration level of devices, and brings better stability.
The invention has various embodiments, and all technical schemes formed by equivalent transformation or equivalent transformation fall within the protection scope of the invention.
Claims (3)
1. A cross-linked network circular arc piezoelectric energy collector, characterized in that: the cantilever structure comprises a first main cantilever Liang Jiban fixed end (1) and a second main cantilever Liang Jiban fixed end (2), wherein at least three groups of cantilever beams (3) are arranged in parallel between the first main cantilever Liang Jiban fixed end (1) and the second main cantilever Liang Jiban fixed end (2), and the cantilever beams are made of phosphor bronze materials; one end of each group of cantilever beams is connected with a fixed end (1) of a first main cantilever Liang Jiban, the other end of each group of cantilever beams is connected with a fixed end (2) of a second main cantilever Liang Jiban, the cantilever beams of each group are symmetrical about a central axis, and each group of cantilever beams consists of three pairs of cantilever beams; three groups of cantilever beams are arranged in parallel between the fixed end (1) of the first main cantilever Liang Jiban and the fixed end (2) of the second main cantilever Liang Jiban, the first group of cantilever beams (I) is composed of three pairs of cantilever beams, the second group of cantilever beams (II) is composed of three pairs of cantilever beams, the third group of cantilever beams (III) is composed of three pairs of cantilever beams, the first group of cantilever beams (I) is composed of three pairs of cantilever beams, the first pair of cantilever beams (10), the second pair of cantilever beams (20) and the third pair of cantilever beams (30) are composed of symmetrical circular arc-shaped sheets, the first pair of cantilever beams (10) is composed of symmetrical first pair of circular arc-shaped sheets (11), the left end of the first pair of circular arc-shaped sheets is a fixed end (100), and the right end of the first pair of circular arc-shaped sheets (12) is connected; the second pair of cantilever beams (20) consists of a symmetrical second pair of circular arc-shaped thin plates (21), the right ends of the second pair of circular arc-shaped thin plates are connected by a second square thin plate (22), and the left ends of the second pair of circular arc-shaped thin plates are connected to the right ends of the first pair of circular arc-shaped thin plates through the first square thin plate; the third pair of cantilever beams (30) consists of a third pair of symmetrical circular arc-shaped thin plates (31), and the left ends of the third pair of circular arc-shaped thin plates are connected to the right ends of the second pair of circular arc-shaped thin plates through second square thin plates (22); the first piezoelectric layer (111), the second piezoelectric layer (211) and the third piezoelectric layer (311) are respectively attached to the first pair of circular arc-shaped sheets (11), the second pair of circular arc-shaped sheets (21) and the third pair of circular arc-shaped sheets (31), and the first mass block (40) and the second mass block (50) are attached to the first square sheet and the second square sheet; the first pair of circular arc-shaped sheets, the second pair of circular arc-shaped sheets and the third pair of circular arc-shaped sheets are 20mm in inner diameter, 30mm in outer diameter, 0.5mm in thickness and 90 degrees in radian.
2. The cross-linked network circular arc piezoelectric energy collector of claim 1, wherein: the first piezoelectric layer, the second piezoelectric layer and the third piezoelectric layer are PZT-5H; the inner diameter and the outer diameter of the first piezoelectric layer, the second piezoelectric layer and the third piezoelectric layer are respectively 20mm and 30mm, the thickness is 0.3mm, and the radian is 90 degrees.
3. The cross-linked network circular arc piezoelectric energy collector of claim 1, wherein: the first mass block and the second mass block are made of nickel materials, and the length, the width and the height of the first mass block and the second mass block are respectively 10mm, 10mm and 10mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180009166A (en) * | 2016-07-18 | 2018-01-26 | 김윤기 | Piezoelectric generator for road |
| CN107919816A (en) * | 2017-12-18 | 2018-04-17 | 南京邮电大学 | Double freedom circular arc type piezoelectric energy collector |
| CN208174576U (en) * | 2018-05-02 | 2018-11-30 | 南京邮电大学 | A kind of cross-linked network circular arc type piezoelectric type energy collector |
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| EP1843406A1 (en) * | 2006-04-05 | 2007-10-10 | Nederlandse Organisatie voor Toegepast-Natuuurwetenschappelijk Onderzoek TNO | Actuator comprising an electroactive polymer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180009166A (en) * | 2016-07-18 | 2018-01-26 | 김윤기 | Piezoelectric generator for road |
| CN107919816A (en) * | 2017-12-18 | 2018-04-17 | 南京邮电大学 | Double freedom circular arc type piezoelectric energy collector |
| CN208174576U (en) * | 2018-05-02 | 2018-11-30 | 南京邮电大学 | A kind of cross-linked network circular arc type piezoelectric type energy collector |
Non-Patent Citations (1)
| Title |
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| 压电陶瓷风力发电机的创新设计;董志利;张广明;徐飞;;微特电机(第01期);全文 * |
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