CN108712108A - A kind of bistable state piezoelectric vibration energy collector array apparatus - Google Patents

Abstract

The present invention discloses a kind of bistable state piezoelectric vibration energy collector array apparatus, and described device includes：Metal base, multiple piezoelectric energy collectors；The piezoelectric energy collector includes：Metal substrate, Hookean spring, metallic gauge block, piezoelectric ceramics；The metal substrate is located at the side of the metal base, and the metal substrate is vertical with the metal base；The metallic gauge block is located at the free end of the metal substrate, and the piezoelectric ceramics is located at the upper and lower surface of the fixing end of the metal substrate；The Hookean spring is between adjacent two metallics gauge block.Above-mentioned apparatus in the present invention can overcome the problems, such as that single piezoelectric vibration energy collector bandwidth of operation is narrow, improve the energy acquisition efficiency of vibration energy collector.

Description

A bistable piezoelectric vibration energy harvester array device

technical field

The invention relates to the technical field of power generation, in particular to a bistable piezoelectric vibration energy harvester array device.

Background technique

Piezoelectric vibration energy harvester is a new electromechanical energy conversion device that collects and converts mechanical vibration energy in the environment into electrical energy, and can be used to power low-power electronic products. Compared with linear piezoelectric vibration energy harvesters, bistable piezoelectric vibration energy harvesters have wider operating frequency bandwidth and higher energy harvesting efficiency. However, its bistable output performance requires a large external environmental excitation intensity. When the environmental excitation intensity is small, the bistable piezoelectric vibration energy harvester performs small-amplitude monostable vibration in the well, which makes the bistable voltage The output of the electro-vibration energy harvester is greatly reduced. In addition, the working frequency band of a single bistable piezoelectric vibration energy harvester usually cannot completely cover all the frequency components contained in the environmental vibration. The output performance of the steady-state piezoelectric vibration energy harvester is not ideal. Moreover, most of the current bistable piezoelectric vibration energy harvesters adopt the terminal magnet coupling structure, which is difficult to be better applied in some special environments, such as strong magnetic environments, inside the human body, and so on.

Contents of the invention

The purpose of the present invention is to provide a bistable piezoelectric vibration energy harvester array device to overcome the problem of narrow operating frequency band of a single piezoelectric vibration energy harvester and improve the energy collection efficiency of vibration energy harvesting.

To achieve the above object, the present invention provides the following scheme:

A bistable piezoelectric vibration energy harvester array device, the device includes a metal base and a plurality of piezoelectric energy harvesters spaced on the side of the metal base;

The piezoelectric energy harvester includes: a metal substrate, a linear spring, a metal quality block, and piezoelectric ceramics;

The fixed end of the metal base is fixed on the side of the metal base, and the metal base is perpendicular to the metal base; the metal quality block is located at the free end of the metal base, and the piezoelectric ceramic is located at the The upper surface and the lower surface of the fixed end of the metal substrate; the linear spring is arranged between the metal mass blocks of two adjacent piezoelectric energy harvesters.

Optionally, the piezoelectric energy harvester is fixed by bolts at a center height of 50 mm on the side of the metal base.

Optionally, all the piezoelectric energy harvesters are located on the same horizontal plane.

Optionally, the metal base is made of aluminum alloy and has a size of 300×100×10mm ³ .

Optionally, the metal substrate is made of aluminum alloy and has a size of 80×15×0.1mm ³ .

Optionally, the material of the metal mass is beryllium bronze, and the size is 15×10×5mm ³ .

Optionally, the piezoelectric ceramics located on the upper surface of the metal substrate and the piezoelectric ceramics located on the lower surface of the metal substrate have the same size and opposite polarization directions, and the piezoelectric ceramics are glued by epoxy junctions on the upper and lower surfaces of the metal substrate.

Optionally, the piezoelectric energy harvesters specifically include five and are arranged at equal intervals.

According to the specific embodiments provided by the invention, the invention discloses the following technical effects:

A bistable piezoelectric vibration energy harvester array device provided by the present invention is horizontally fixed on a metal base by a plurality of piezoelectric vibration energy harvesters with terminal linear spring coupling structures to form a bistable piezoelectric energy harvester array device. Electric vibration energy harvester array, the working frequency bands of multiple double cantilever piezoelectric energy harvesters are connected in series to form a wide frequency window, which can overcome the problem of narrow working frequency band of a single linear piezoelectric vibration energy harvester, so as to improve vibration energy harvesting energy harvesting efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is a schematic structural diagram of a bistable piezoelectric vibration energy harvester array device according to an embodiment of the present invention;

Fig. 2 is a top view of a bistable piezoelectric vibration energy harvester array device according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a single piezoelectric energy harvester according to an embodiment of the present invention;

Fig. 4 is a comparison diagram of the output performance of the bistable piezoelectric vibration energy harvester array device and a single linear piezoelectric energy harvester according to the embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The purpose of the present invention is to provide a bistable piezoelectric vibration energy harvester array device to overcome the problem of narrow operating frequency band of a single piezoelectric vibration energy harvester and improve the energy collection efficiency of vibration energy harvesting.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic structural diagram of a bistable piezoelectric vibration energy harvester array device according to an embodiment of the present invention. As shown in Fig. 1, the device includes: a metal base 1, a plurality of piezoelectric energy harvesters;

The piezoelectric energy harvester 2 includes: a metal substrate 201, a linear spring 202, a metal quality block 203, and a piezoelectric ceramic 204;

The piezoelectric ceramics include a first piezoelectric ceramic 2041 and a second piezoelectric ceramic 2042; wherein, the first piezoelectric ceramic 2041 and the second piezoelectric ceramic 2042 have the same size and opposite polarization directions, and are passed through epoxy Glue is bonded to the upper surface and the lower surface of the metal substrate 201 .

The metal base 201 is located on the side of the metal base 1, and the metal base 201 is perpendicular to the metal base 1; the piezoelectric ceramic 204 is located on the upper surface and the lower surface of the fixed end of the metal base 201 The metal mass 203 is located at the free end of the metal substrate 201, the linear spring 202 is located between two adjacent metal masses 203, and the stiffness coefficient of the linear spring 202 is adjustable.

Specifically, the stiffness is adjusted by changing the thickness of the spring. Adjusting the stiffness of the spring can change the nonlinear force at the end of the collector, which matters to the bistable vibration of the collector.

The piezoelectric energy harvesters in the present invention specifically include five and are arranged at equal intervals, so a wider working window can be formed.

Specifically, the piezoelectric energy harvester is fixed on the center of the metal base at a height H by bolts, where H=50mm.

Specifically, all the piezoelectric energy harvesters are located on the same horizontal plane.

Specifically, the metal base is made of aluminum alloy and has a size of 300×100×10mm ³ .

Specifically, the metal substrate is made of aluminum alloy and has a size of 80×15×0.1mm ³ .

Specifically, the material of the metal mass is beryllium bronze, and the size is 15×10×5mm ³ .

The material (such as density, modulus of elasticity), length and width of the piezoelectric energy harvester in the present invention are exactly the same, and the thickness may not be completely the same, because the thickness may not be completely the same, so the resonant frequency of the harvester can be guaranteed Not exactly the same.

Specifically, the piezoelectric energy harvester in the present invention includes five, namely the first piezoelectric energy harvester 2, the second piezoelectric energy harvester 3, the third piezoelectric energy harvester 4, and the fourth piezoelectric energy harvester. Electric energy harvester 5 , fifth piezoelectric energy harvester 6 .

Wherein, the size of the metal substrate in the first piezoelectric energy harvester 2 is 80×15×0.1mm ³ , the size of the metal substrate in the second piezoelectric energy harvester 3 is 80×15×0.15mm ³ , The size of the metal substrate in the third piezoelectric energy harvester 4 is 80×15×0.25 mm ³ , and the size of the metal substrate in the fourth piezoelectric energy harvester 5 is 80×15×0.3 mm ³ .

Fig. 2 is a top view of an array device of bistable piezoelectric vibration energy harvesters according to an embodiment of the present invention, and the distance between two adjacent piezoelectric energy harvesters is 40 mm.

The first piezoelectric energy harvester 2 and the fifth piezoelectric energy harvester 6 are single linear spring coupling bistable energy harvesters; the second piezoelectric energy harvester 3, the third piezoelectric energy harvester 4, the fourth piezoelectric energy harvester Piezoelectric energy harvester 5 is a bistable energy harvester of bilinear spring coupling type; by changing the structural dimensions (such as length, width and thickness) of five piezoelectric energy harvesters, and then changing the The resonant working frequency band of the five piezoelectric energy harvesters can be connected in series to form a wider working window to achieve the purpose of expanding the working frequency band of the energy harvesters; by adjusting the horizontal distance between the energy harvesters And the stiffness coefficient of the linear spring, and then change the nonlinear force on the end of the piezoelectric oscillator of the cantilever beam, so that the system exhibits linear or nonlinear oscillation characteristics, generates bistable vibration, and realizes efficient energy harvesting.

Fig. 3 is a schematic structural diagram of a single piezoelectric energy harvester according to an embodiment of the present invention. As shown in Fig. 3 and Table 1, Table 1 shows the size parameters of the first piezoelectric energy harvester to the fifth piezoelectric energy harvester according to the embodiment of the present invention. Where L represents the length of the metal substrate, Lp is the length of the piezoelectric ceramic, b is the width of the metal substrate, h _p is the thickness of the piezoelectric ceramic, and h _s is the thickness of the metal substrate.

Table 1 Unit (mm)

L L _p b h _s h _p first collector 80 12 15 0.10 0.5 second collector 80 12 15 0.15 0.5 third collector 80 12 15 0.20 0.5 fourth collector 80 12 15 0.25 0.5 fifth collector 80 12 15 0.30 0.5

Fig. 4 is the output performance comparison figure of the bistable piezoelectric vibration energy harvester array device and a single linear piezoelectric energy harvester in the embodiment of the present invention; the bistable piezoelectric vibration energy harvester array device as shown in Fig. 3 Compared with the working frequency band of a single linear collector, the working frequency band is greatly expanded, and there is an obvious jumping phenomenon.

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (8)

1. a kind of bistable state piezoelectric vibration energy collector array apparatus, which is characterized in that described device include metal base and Piezoelectric energy collector of multiple intervals set on the metal base side；

The piezoelectric energy collector includes：Metal substrate, Hookean spring, metallic gauge block, piezoelectric ceramics；

The fixing end of the metal substrate is fixed on the side of the metal base, and the metal substrate and the metal base Vertically；The metallic gauge block is located at the free end of the metal substrate, and the piezoelectric ceramics is located at consolidating for the metal substrate The upper and lower surface of fixed end；The Hookean spring be set to adjacent two piezoelectric energy collector the metallic gauge block it Between.

2. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that described Piezoelectric energy collector is bolted on the center side height positioned at the metal base as at 50mm.

3. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that described All piezoelectric energy collectors are located in same level.

4. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that described The material of metallized metal pedestal is aluminium alloy, and size is 300 × 100 × 10mm³。

5. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that described The material of metal substrate is aluminium alloy, and size is 80 × 15 × 0.1mm³。

6. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that described The material of metallic gauge block is beryllium-bronze, and size is 15 × 10 × 5mm³。

7. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that be located at The size of the piezoelectric ceramics of the metal substrate upper surface and the piezoelectric ceramics positioned at the metal substrate lower surface Identical, polarization direction is on the contrary, the piezoelectric ceramics is bonded in the upper and lower surface of the metal substrate by epoxy glue.

8. a kind of bistable state piezoelectric vibration energy collector array apparatus according to claim 1, which is characterized in that described Piezoelectric energy collector specifically includes 5, and spaced set.