CN105897048B - A kind of piezoelectric generating device with wider resonance frequency band - Google Patents

Abstract

The invention discloses a piezoelectric generating device with a wide resonant frequency band, which includes a buffer layer and a piezoelectric layer. The piezoelectric layer is provided with a piezoelectric device and a lever mechanism, and the lever mechanism is squeezed on the buffer layer. Toggle the piezoelectric device from time to time to make the piezoelectric device generate continuous vibration. The lever mechanism includes several lever units arranged along the length direction of the piezoelectric generator, the lever unit includes a horizontal bar and a vertical bar, the horizontal bar is hinged to the top of the vertical bar, and the lever unit also includes a vertical bar The provided spring, the support rod arranged transversely on the spring, the rack fixedly arranged at the end of the support rod and the gear meshed with the rack and used to toggle the piezoelectric device, the cross bar drives the spring to move upward. Compared with the prior art, the present invention uses a piezoelectric sheet to make a piezoelectric generator, converts the pressure from the foot or other pressures through the piezoelectric sheet into electrical energy and stores it, and utilizes vibration energy that has not been fully utilized in the past.

Description

A Piezoelectric Power Generation Device with a Wide Resonant Frequency Band

technical field

The invention relates to the field of power generation, in particular to a piezoelectric power generation device with a wide resonance frequency band.

Background technique

The support methods of the piezoelectric vibrator mainly used in the existing piezoelectric power generation technology include direct cantilever support, rigid support, free boundary support and simple support. These structures are mainly used in power generation structures (floors, etc.) Shortcomings such as poor stability, bulky structure, and insufficient aesthetics are unfavorable for making it marketable, commercialized, and popularizing its use. At the same time, related applications are mainly designed as structures such as floors, but due to the large cut-off area, the overall device is bulky, which is not conducive to installation, use or maintenance.

On the other hand, for the electric energy collection method of the piezoelectric power generation device, the current popular idea is to directly use supercapacitors to collect electric energy on the basis of simple rectification and voltage stabilization. However, studies have found that for unstable input voltages and small input currents, the charging effect of supercapacitors is not ideal.

Contents of the invention

In view of this, the present invention provides a piezoelectric generator with a wider resonance frequency band.

The purpose of the present invention is achieved through the following technical solutions, a piezoelectric generator with a wider resonance frequency band, comprising a buffer layer 1 and a piezoelectric layer 2, the piezoelectric layer is provided with a piezoelectric device and a lever mechanism, The lever mechanism moves the piezoelectric device when the buffer layer is squeezed, so that the piezoelectric device generates continuous vibration.

Further, the lever mechanism includes several lever units arranged along the length direction of the piezoelectric generator, the lever unit includes a cross bar 4 and a vertical bar 3, the cross bar is hinged to the top of the vertical bar, and the cross bar It is divided into a first section and a second section along the joint with the vertical rod, the second section is longer than the first section, and the lever unit also includes a vertically arranged spring 9, a support rod 10 arranged transversely on the spring, The rack 11 fixed at the end of the support rod and the gear 12 meshing with the rack and used to toggle the piezoelectric device; the spring is fixedly connected to the bottom of the piezoelectric layer, and the second section drives the spring to move upward.

Further, the piezoelectric generating device includes several piezoelectric generating units arranged along the length direction of the piezoelectric generating device, and the piezoelectric generating unit includes a cantilever beam 8, a piezoelectric sheet 7 arranged on the cantilever beam, and a piezoelectric sheet arranged on the cantilever The mass block 6 at the free end of the beam, the cantilever beam also includes a fixed end opposite to the free end, the end surface of the mass block away from the fixed end has a certain distance from the end of the cantilever beam.

Further, the cantilever beams of each piezoelectric generating unit have different lengths.

Further, the mass blocks of each piezoelectric generating unit have different weights.

Further, the piezoelectric generating device includes an energy storage device, the energy storage device includes a diode, a capacitor, a switch, a DC voltage converter and a rechargeable battery connected in sequence, and the diode is connected to the piezoelectric device.

Owing to adopting above-mentioned technical scheme, the present invention has following advantage:

Compared with the prior art, the present invention utilizes a piezoelectric sheet to make a piezoelectric generator, and converts the pressure from the feet or other pressures into electrical energy through the piezoelectric sheet and stores it. Using the characteristics and principle of the piezoelectric effect of the piezoelectric sheet, the electric energy generated by the piezoelectric sheet through the piezoelectric effect is stored in the rechargeable battery, and the vibration energy that has not been fully utilized in the past is utilized.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is a schematic diagram of the present invention;

Figure 2 is a schematic diagram of the placement of the piezoelectric generating unit;

Figure 3 is a schematic block diagram of the energy storage device.

detailed description

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.

As shown in Figures 1 and 2, a piezoelectric generating device with a wider resonance frequency band includes a buffer layer 1 and a piezoelectric layer 2, and the piezoelectric layer is provided with a piezoelectric device and a lever mechanism, and the lever mechanism When the buffer layer is squeezed, the piezoelectric device is moved to make the piezoelectric device generate continuous vibration.

The lever mechanism includes several lever units arranged along the length direction of the piezoelectric generator, the lever unit includes a cross bar 4 and a vertical bar 3, the cross bar is hinged at the top of the vertical bar, and the cross bar is connected to the top of the vertical bar. The joint of the vertical bar is divided into a first section and a second section, the second section is longer than the first section, and the lever unit also includes a vertically arranged spring 9, a support rod 10 horizontally arranged on the spring, and a fixedly arranged The rack 11 at the end of the support rod and the gear 12 engaged with the rack and used to toggle the piezoelectric device; the spring is fixedly connected to the bottom of the piezoelectric layer, and the second section drives the spring to move upward.

The piezoelectric generating device includes several piezoelectric generating units arranged along the length direction of the piezoelectric generating device, and the piezoelectric generating unit includes a cantilever beam 8, a piezoelectric sheet 7 arranged on the cantilever beam and a free The mass block 6 at the end, the cantilever beam also includes a fixed end opposite to the free end, and the end face of the mass block away from the fixed end has a certain distance from the end of the cantilever beam.

When the buffer layer is squeezed, one end of the lever mechanism in the piezoelectric layer is forced to move downward. At the same time, the lever mechanism drives the rack to move upward, and the gear meshing with the rack moves the piezoelectric device to vibrate; Under the action of restoring force, the gear is driven to reversely move the piezoelectric device, which can make it vibrate again.

The cantilever beams of each piezoelectric generating unit have different lengths, and the mass blocks of each piezoelectric generating unit have different weights. The invention adopts a multi-cantilever beam structure, and the mass blocks of each piezoelectric generating unit have different weights, which effectively widens the resonance frequency band and further improves the electromechanical conversion efficiency.

The energy storage device in this embodiment includes a diode, a capacitor, a switch, a DC voltage converter and a rechargeable battery that are sequentially connected in a circuit. The energy from the piezoelectric generating unit is temporarily stored in the capacitor through the diode. When the capacitor voltage reaches a certain value, the switch is turned on, the capacitor starts to discharge, and the rechargeable battery is charged through the DC voltage converter; when the capacitor is discharged, the voltage is lower than the set value When the switch is turned off, the capacitor starts to charge, and so on, the energy generated by the piezoelectric generating unit is stored in the rechargeable battery.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (5)

1. a kind of piezoelectric generating device with wider resonance frequency band, it is characterised in that：Including cushion（1）And piezoelectric layer（2）, Piezo-electric device and leverage are provided with the piezoelectric layer, the leverage stirs piezoelectricity dress when cushion is squeezed Put, piezo-electric device is produced sustained vibration；The leverage includes what several were arranged along piezoelectric generating device length direction Lever unit, the lever unit includes cross bar（4）And montant（3）, the cross bar linked in the top of montant, the cross bar edge Hinge joint punishment with montant is first paragraph and second segment, and the second segment is longer than first paragraph, and it is vertical that the lever unit also includes The spring of setting（9）, the support bar that is horizontally set on spring（10）, be fixedly installed on the rack of support bar end（11）With with Rack engagement and for stirring the gear of piezo-electric device（12）, the spring is fixed in the bottom of piezoelectric layer, the second segment Spring is driven to move upwards.

2. piezoelectric generating device according to claim 1, it is characterised in that：The piezoelectric generating device includes several edges The piezo-electric generating unit of piezoelectric generating device length direction arrangement, the piezo-electric generating unit includes cantilever beam（8）, be arranged at it is outstanding Piezoelectric patches on arm beam（7）With the mass for being arranged at cantilever beam free end（6）, the cantilever beam also includes relative with free end The fixing end of setting, the end of end face and cantilever beam of the mass away from fixing end has certain distance.

3. piezoelectric generating device according to claim 2, it is characterised in that：The length of the cantilever beam of each piezo-electric generating unit Degree is different.

4. piezoelectric generating device according to claim 3, it is characterised in that：The weight of the mass of each piezo-electric generating unit Amount is different.

5. piezoelectric generating device according to claim 4, it is characterised in that：The piezoelectric generating device includes energy storage device, The energy storage device includes diode, electric capacity, switch, dc voltage changer and the rechargeable battery being sequentially connected, described two Pole pipe is connected with piezo-electric device.