RU2362263C2 - Piezoelectric generator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: piezoelectric generator is meant for emergency power supply for low-power devices - mobile telephones and electronic locks. The generator has an actuating arm, which can act on a piezoelectric element through an actuating device, made in form of a vibromechanism meant for converting movement of the actuating arm into pulsed effect on the piezoelectric element. The actuating arm can be linked to the vibromechanism through a damper spring or mechanical spring mechanism, and the vibromechanism can be self-exciting.

EFFECT: simplicity and reliability of the design; high output of electrical energy for single mechanical action on the actuating arm.

2 dwg

Description

FIELD OF TECHNOLOGY

The invention relates to piezoelectric generators and can be used in devices with low energy consumption, for example in emergency power devices for mobile phones and electronic locks.

BACKGROUND OF THE INVENTION

A known piezoelectric generator containing a drive mechanism in the form of a rotor and a piezoelectric element in the form of a stator on which one or more disk bimorph piezoelectric elements are fixed. With the help of the rollers fixed on the rotor, circular deformation of the piezoelectric element is carried out. This device is built using rotating parts, which reduces the reliability and resource of the product (RU 2113757 C1, published on 06/20/1998).

Also known is a piezoelectric generator made in the form of a piezo lighter for lighting, comprising a drive lever mounted to act on the piezoelectric element by means of a drive device made in the form of a spring shock mechanism. This device provides a single cycle of action on the piezoelectric element and, accordingly, allows you to generate enough energy to obtain one spark discharge. Using a variant of this mechanism, which allows a single stroke on the drive lever to carry out a series of strokes on the piezoelectric element, can increase the amount of generated energy, but is associated with a decrease in the resource and technical reliability of the device (RU 2217662 C2, published November 27, 2003).

The closest analogue to the claimed invention is a piezoelectric generator, made in the form of a lighter for burning gas in gas stoves. The device comprises a movable drive lever mounted with the possibility of shockless impact on the pencil case with piezoelectric elements by means of a drive device made in the form of a lever mechanism. A single exposure to the drive lever allows you to get a series of spark discharges, which indicates a significant amount of generated energy. Nevertheless, the amount of electricity generated by this device is insufficient for some applications, for example, for emergency power supply of a mobile phone (RU 92002101 A, published on 10/30/1994).

DESCRIPTION OF THE INVENTION

The objective of the invention is the creation of a simple in design, reliable piezoelectric generator with a high return of electrical energy with a single mechanical impact on the drive lever.

The technical result that allows to solve this problem is the conversion of the translational movement of the drive arm into a pulsating cyclic effect on the piezoelectric element.

The technical result is achieved by the fact that in a piezoelectric generator containing a drive lever mounted with the possibility of influencing the piezoelectric element by means of the drive device, in accordance with the claims, the latter is made in the form of a vibro-mechanism that converts the movement of the lever into a pulsating effect on the piezoelectric element, and the lever can be connected with a vibro mechanism by means of a shock-absorbing spring or a winding spring mechanism, and the vibro mechanism can be self-oscillating.

Signs that distinguish from the closest analogue are:

- the drive device is made in the form of a vibromechanism;

- vibromechanism converts the movement of the drive arm into a pulsating effect on the piezoelectric element;

- the drive lever may be associated with a vibro mechanism by means of a shock absorber spring;

- the drive lever may be associated with a vibro mechanism through a winding spring mechanism.

MODE FOR CARRYING OUT THE INVENTION

The invention is further illustrated by the description of an example of a specific implementation and the drawings,

where figure 1 shows a conventional kinematic diagram of a piezoelectric generator and the position of its elements;

figure 2 shows a piezoelectric generator with additional functional elements introduced in accordance with alternative features of the claims.

The generator contains a piezoelectric element 1 (figure 1), made in the form of a piezoelectric plate (a package of several piezoelectric plates), fixed at one end in the housing 2, and provided with electrical leads (not shown). A drive lever 3 with a handle 4 at the end is rotary mounted on the housing. The vibro mechanism is formed by the movable spring lobe 5 and the pusher 6. The petal 5 is placed in the guides 7 with the possibility of interaction with its first end 8 with the drive lever 3. The second end 9 of the blade 5 is pressed by the return spring 10 towards the drive lever 3. The pusher 6 is placed on the free end the pivotally mounted lever 11 with the possibility of interaction with one end with the side surface of the petal 5, made corrugated, and the other end with the loose end of the piezoelectric element 1. The end facing the petal 5 then Catel 6 equipped with a roller 12 designed to avoid friction between the tappet 6 and 5 lobe.

In this design, the first end 8 of the petal 5, in accordance with an alternative feature of the claims, functions as a rigid connection of the lever 3 with the vibromechanism.

Differences in the design shown in figure 2, are as follows.

At the first end 8 of the petal 5 (FIG. 2), in accordance with an alternative feature of the claims, a shock absorber spring 14 made in the form of a spring bending of the petal 5 is installed, designed to reduce vibration on the drive arm 3 and to move it at a pace not associated with the operation of the vibromechanism . The drive lever 3 in accordance with an alternative feature of the claims may also be associated with a vibromechanism by means of a winding spring mechanism (not shown) that allows the mechanical energy to be stored in the device for future use.

To reduce the effort on the handle 4, as well as between the elements of the vibro-mechanism, the latter, in accordance with claim 2, is given the properties of an oscillating system by introducing additional elements into the design - a spring element 15 and an inertial mass 16 connected to the pusher 6, and a damping spring 17 between the pusher 6 and the piezoelectric element 1.

The roller 13 at the end of the pusher 6 is provided on the periphery with protrusions corresponding to the depressions of the corrugated surface of the petal.

The device operates as follows.

To actuate the device, press the handle 4 (Fig. 1) of the drive lever 3. It rotates by pressing the end 8 of the petal 5. The petal 5, overcoming the action of the return spring 10, moves in the guides 7 and under the influence of the roller rolling along its corrugated surface 12 is bent, cyclically pressing the pusher 6. He transfers a pulsating force to the loose end of the piezoelectric element 1, as a result of which the sign-changing electrical voltage appears on the terminals of the piezoelectric element 1, which is supplied to the rectifier circuit and charge storage circuit (not shown).

When removing the force from the handle 4, the petal 5 and the lever 4 under the action of the return spring 10 return to their original position. In this case, the process of generating electricity is repeated again.

It is obvious that in the absence of the need for generating electricity in the reverse stroke of the drive lever 3, the design can be modified so that the interaction of the petal 5 and the pusher 6 at this stage will not occur.

The functioning of the structure shown in figure 2, has a number of the following features.

The vibration on the drive lever 3 (figure 2) dampens the shock absorber spring 14. If the latter has a low stiffness, the movement of the drive lever 3 can be done at an accelerated pace, while the vibromechanism will function under the action of the compressed shock absorber spring 14.

If the drive lever 3 is connected to the vibromechanism by means of a winding spring mechanism, the device allows you to accumulate mechanical energy "for future use" - at a pace that is not related to the rate of energy transfer from the vibromechanism to the piezoelectric element 1. The rate of operation of the vibromechanism is determined by the frequency of its oscillations, determined by the stiffness of the spring element 15 and the value of the inertial mass 16, and the force on the lever 3 due to the accumulation of energy in the vibro mechanism is less than in the mechanism shown in figure 1. Accordingly, less wear and tear on structural elements. The damping spring 17 and the shock-absorbing spring 14 weaken the connection of the oscillatory system (15, 16) with external “rigid” subsystems — the piezoelectric element 1 and the drive lever 3, which provides conditions for the accumulation of energy in the oscillatory system (15, 16). It should be noted that due to the presence of the damping spring 17, the corrugated part of the petal 5 can be made rigid.

The presence of protrusions on the outer surface of the roller 13 allows him to move the petal 5 to "step" with the protrusions along the troughs of the corrugated part of the petal 5, turning in them as in local turning centers. Due to this, the wear of the interacting surfaces of the roller 13 and the petal 5 is reduced.

Thus, the proposed design, having simplicity and reliability, provides the generation of a significant amount of electricity with a single mechanical impact on the drive lever 3.

APPLICATION AREA

The invention can be used in devices with low energy consumption, for example, in emergency power supply devices for mobile phones and in electronic locks equipped with a rotary handle: pressing the handle driving the piezoelectric generator will provide sufficient electrical energy to power the electronic circuit and operate lock electromechanism.

Claims (1)

A piezoelectric generator containing a drive lever (3), mounted with the possibility of influencing the piezoelectric element (1) by means of a drive device, characterized in that the latter is made in the form of a vibromechanism (5, 13, 6), designed to convert the movement of the drive lever (3) to a pulsating effect on the piezoelectric element (1), and the drive lever (3) can be connected with the vibro mechanism (5, 13, 6) by means of a shock absorber spring (14) or a winding spring mechanism, and the vibro mechanism (5, 13, 6) can be self-oscillating solid.

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