CN201174668Y - An impact piezoelectric generator - Google Patents

Abstract

The utility model relates to an impact type piezoelectric generating device. Most existing piezoelectric power generation devices are designed according to specific occasions, and are not suitable for application in piezoelectric energy harvesting devices for testing tire pressure. The utility model comprises two ring-shaped shells closely matched, each shell has an annular groove on its contact surface, and the two grooves are arranged at corresponding positions, and form a sealed annular steel ball channel after butt joint. 4 to 10 piezoelectric vibrators are uniformly and fixedly arranged along the circumference of the steel ball channel in the steel ball channel, and a steel ball is movably arranged in each section of the steel ball channel. The piezoelectric vibrator includes a piezoelectric ceramic sheet, and metal substrates are fixed on both sides. The utility model is used to supply power to a piezoelectric energy acquisition device for testing tire pressure, which improves monitoring and wireless emission density, improves system real-time performance, overcomes the limitation of battery life on the system, and prolongs the life of the tire pressure monitoring device.

Description

An impact piezoelectric generator

technical field

The utility model relates to an impact piezoelectric generating device, in particular to an impact piezoelectric generating device used in a piezoelectric energy collection system.

Background technique

Piezoelectric energy harvesting system is a system that automatically collects energy in the environment and supplies energy to electronic circuits, such as tire pressure monitoring systems. Piezoelectric energy harvesting systems are an effective solution for those that cannot be powered by transmission lines or have difficulties in replacing batteries when powered by lithium batteries. Most of the current TPMS (tire pressure monitoring systems) are powered by lithium batteries. Due to the limited power of lithium batteries and the trouble of replacement, the density of tire pressure monitoring and wireless transmission is reduced for energy saving, which affects the real-time monitoring. Therefore, it is necessary to introduce a piezoelectric energy harvesting system to make the TPMS passive, thereby prolonging the life of the system and increasing the density of monitoring and wireless transmission. Most existing piezoelectric power generation devices are designed according to specific occasions, and are not suitable for application in piezoelectric energy harvesting systems for testing tire pressure.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide an impact type piezoelectric generator suitable for use in tires.

The utility model comprises two symmetrically arranged and closely matched annular shells, each shell has an annular groove along the circumferential direction on the contact surface matched with the other shell, and the two annular grooves correspond to The position is set, and a sealed ring-shaped steel ball channel is formed after docking. In the steel ball channel, n (4≤n≤10) piezoelectric vibrators are uniformly and fixedly arranged along the circumference of the steel ball channel, and the steel ball channel is divided into n sections, and a steel ball is movable in each section of the steel ball channel. The piezoelectric vibrator includes a piezoelectric ceramic sheet, metal substrates are fixed on both sides of the piezoelectric ceramic sheet, and the overall plane of the piezoelectric vibrator is perpendicular to the steel ball channel.

During the driving process of the car, there is a wealth of mechanical energy in the car tires, which can be converted into electrical energy through special processing for use by the tire pressure monitoring system. Adopting the utility model can provide power for it, increase the density of monitoring and wireless transmission, improve the real-time performance of the system, overcome the limitation of the life of the battery on the system, and prolong the life of the tire pressure monitoring system.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a side view structural schematic diagram of Fig. 1;

FIG. 3 is a schematic structural diagram of the piezoelectric vibrator in FIG. 1 .

Detailed ways

As shown in Figures 1 and 2, the impact-type piezoelectric power generation device includes two symmetrically arranged high-temperature-resistant annular plastic shells 1, the two shells 1 are closely matched, and each shell 1 is in contact with the other. An annular groove is formed along the circumferential direction on the matching contact surface of one side of the shell, and the two annular grooves are arranged at corresponding positions to form a sealed annular steel ball channel 2 after butt joint. Four piezoelectric vibrators 3 are evenly and fixedly arranged in the steel ball channel 2 along the circumference of the steel ball channel 2, and the four piezoelectric vibrators 3 divide the steel ball channel 2 into four sections, and a steel ball 4 is movable in each section of the steel ball channel. The plastic shell is made of high-temperature-resistant fluoroplastic; the plastic shell has a plastic channel, the width of which is slightly wider than the diameter of the small steel ball; the piezoelectric vibrator 3 is evenly embedded in the plastic structure so that its center coincides with the center of the channel. There are also grooves for placing rectifier circuits and lead holes for external leads in the device.

As shown in Figure 3, the piezoelectric vibrator 3 includes a piezoelectric ceramic sheet 3-1, the two sides of the piezoelectric ceramic sheet 3-1 are bonded with a metal substrate 3-2 with 502 glue, and the overall plane of the piezoelectric vibrator is aligned with the steel plate. Ball channel 2 is vertical. Piezoelectric ceramic sheet 3-1 adopts lead zirconate titanate piezoelectric ceramics doped with impurities, such as the HF-B3.5M series piezoelectric vibrator of Wuxi Huifeng Company. The piezoelectric vibrator 3 has a length of 40 mm, a width of 20 mm, and a thickness of 1 mm. The metal substrate 3-2 is made of phosphor bronze with high modulus of elasticity, with a length of 50 mm, a width of 20 mm, and a thickness of 0.4 mm.

The working process of the utility model circuit:

When the car is running, the steel ball accelerates under the action of gravity after reaching the highest point, which will generate relative speed and impact on the previous piezoelectric vibrator in the counterclockwise direction. At the low point, the deceleration under the action of gravity will have an impact on the piezoelectric vibrator behind the counterclockwise. At the same time, the acceleration and deceleration of the car will also cause the small steel ball and the piezoelectric vibrator to generate relative speed and collide. Due to the change of the impact force, the deformation of the piezoelectric ceramic sheet is caused, which finally leads to the change of the bound charge on the surface of the piezoelectric ceramic. The change of the bound charge on the surface of the piezoelectric ceramic will cause the change of the electric field and promote the movement of free electrons. At this time, there will be an alternating current output with an indeterminate peak value at both ends of the piezoelectric ceramic. After rectifying and filtering the output AC current and storing it, it can supply power for the tire pressure detection system.

Claims (1)

1. An impact-type piezoelectric power generation device, comprising two symmetrically arranged and tightly fitted ring-shaped shells, characterized in that each shell is opened along the circumferential direction on the contact surface matched with the other shell. There are annular grooves, two annular grooves are set at corresponding positions, and a sealed annular steel ball channel is formed after docking; n piezoelectric vibrators are evenly fixed and fixed along the circumference of the steel ball channel in the steel ball channel to separate the steel ball channel For n sections, 4≤n≤10; set a steel ball in each section of the steel ball channel; The piezoelectric vibrator includes a piezoelectric ceramic sheet, metal substrates are fixed on both sides of the piezoelectric ceramic sheet, and the overall plane of the piezoelectric vibrator is perpendicular to the steel ball channel.

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