CN102723433A - Improved multilayer piezoelectric transduction element - Google Patents

Abstract

The invention discloses an improved multilayer piezoelectric transduction element. The improved multilayer piezoelectric transduction element comprises a multilayer piezoelectric ceramic and a multilayer structure which is formed by sequentially stacking multiple electrode layers from top to bottom, the electrode layers are divided into multiple same sections, the electrode layers located at the same section and the odd-numbered layers are electrically connected with each other, and the electrode layers located at the same section and the even-numbered layers are electrically connected with each other. According to the invention, multiple multilayer piezoelectric elements are integrated into a whole, based on the structure, through the settings of different polarization modes and directions and the selection of series-parallel connection modes, the voltage or current output and adjustment can be performed on a single piezoelectric element. In such a way, when the element disclosed by the invention is applied to a piezoelectric power generator, multiple transduction devices are independent and not mutually influenced, so that under the condition that the vibration frequency is equal to or lower than the first-order natural vibration frequency, the energy loss caused by that the vibration phases are different can be effectively avoided.

Description

A kind of improved multi-layer piezoelectric inverting element

Technical field

The present invention relates to a kind of piezoelectric energy-conversion element, particularly relate to a kind of multi-layer piezoelectric inverting element.

Background technology

Utilizing piezoelectric effect mechanical energy such as will vibrate, to be converted into the piezoelectric generating device of electric energy known for people, and the piezoelectric energy-conversion device is the device of core the most wherein.The piezoelectric energy-conversion device normally is made up of substrate as depicted in figs. 1 and 21 and the piezoelectric energy-conversion element 2 that sticks onsubstrate 1 single or double; Whensubstrate 1 vibration; 2 of piezoelectric energy-conversion elements produce electric energy because of piezoelectric effect, these electric energy are utilized or collect by direct output and store.Existing piezo-electric generating scheme is carried out the adjustment of output voltage and electric current through the connection between a plurality of piezoelectric energy-conversion elements 2; But because the vibration phase of these piezoelectric energy-conversion elements 2 and inequality; The electric energy loss of adopting a plurality of piezoelectric energy-conversion elements 2 to connect in the process of the adjustment of carrying out output voltage and electric currents is bigger, does not still have desirable solution so far.

At present, there is a kind of multilayer inverting element, but its concrete structure and principle application reference people's the CN102208526A of patent application formerly.Yet; The technical problem underlying that this multilayer inverting element is solved is how to reduce driving voltage or increase responsive bandwidth; Be that it is to solve the problem of electric energy in the mechanical energy transfer process in essence, do not solve the electric energy loss problem that existing piezoelectric energy-conversion element exists owing to the difference of vibration phase in the piezoelectric generator when mechanical energy converts electric energy into thereby do not relate to being applied to.

Summary of the invention

The technical problem that the present invention will solve provides a kind of multi-layer piezoelectric inverting element; It can carry out the adjustment of output voltage and electric current separately; And equal first natural frequency or be lower than under the condition of element single order eigentone in vibration frequency, can also solve use many energy transducers piezoelectric generating device because the energy loss problem that a plurality of piezoelectric energy-conversion vibration of element phase place differences cause.

The technical solution adopted for the present invention to solve the technical problems is:

A kind of improved multi-layer piezoelectric inverting element; This multi-layer piezoelectric inverting element integral body is strip; Comprise the sandwich construction that multilayer piezoelectric ceramic and multi-layered electrode layer stack gradually from top to bottom; These electrode layers are separated into identical plurality of sections, and the electrode layer at same section that is positioned at odd-level is electrically connected each other, and the electrode layer at same section that is positioned at even level is electrically connected each other.Because strip shape structure is with first natural frequency or when being lower than the frequency vibration of first natural frequency, the distortion of all the transducing sections in the piezoelectric energy-conversion element all is a homophase, and the signal of telecommunication output of all transducing sections also is homophase.

Improvement as technique scheme; Same section the electrode layer that is positioned at even level and same section the electrode layer that the is positioned at odd-level segment distance that staggers mutually; And same section the electrode layer that is positioned at even level is all in same vertical zone, and same section the electrode layer that is positioned at odd-level is all in same vertical zone.

It is to realize through perfusion conducting medium in the through hole of set inside that said electrode layer is electrically connected each other.

As the further improvement of technique scheme, the polarised direction of adjacent two layers is opposite in the said multilayer piezoelectric ceramic.

As the further improvement of technique scheme, the last layer and the basecoat of said sandwich construction all are electrode layers of segmentation.

As the further improvement of technique scheme, the plurality of sections electrode layer of the said the superiors has been electrically connected mutually and has been used as an output, and said undermost plurality of sections electrode layer has been electrically connected mutually and has been used as an output.

As the further improvement of technique scheme, the electrode layer of the said the superiors is electrically connected with undermost electrode layer successively, and the electrode layer of the superiors of undermost electrode layer and the other end that is positioned at an end is as two outputs.

As the further improvement of technique scheme, sintering has pottery protection surface layer on the surface of the two-layer electrode layer of this last layer and/or basecoat.

As the further improvement of technique scheme, the segmentation of said pottery protection surface layer covers on the electrode layer surface of each section.

As the further improvement of technique scheme, said pottery protection surface layer integral body covers on the electrode layer surface.

With respect to prior art; The invention has the beneficial effects as follows: the present invention is integrated as a whole a plurality of multilayer piezoelectric elements; Based on this structure; Through the setting of different polarization modes, direction and the selection of series-parallel connected mode, on single piezoelectric element, can carry out the output of voltage or electric current, adjustment.Like this; The present invention is in being applied to piezoelectric generating device the time; Equal first natural frequency or be lower than under the condition of single order eigentone in the vibration frequency of this multi-layer piezoelectric inverting element; A plurality of energy transducers in this multi-layer piezoelectric inverting element were both separate, again can in phase vibrations and the output signal of telecommunication, thus can effectively avoid because the energy loss that the vibration phase difference causes.

Description of drawings

In order to be illustrated more clearly in the technical scheme in the embodiment of the invention, the accompanying drawing of required use is done simple declaration in will describing embodiment below:

Fig. 1 is the structural representation of piezoelectric energy-conversion device in the prior art;

Fig. 2 is the structural representation of another kind of piezoelectric energy-conversion device in the prior art;

Fig. 3 is the structural representation of the embodiment of the invention;

Fig. 4 is a kind of polarization and the connection mode sketch map of embodiment among Fig. 3;

Fig. 5 is another kind polarization and the connection mode sketch map of embodiment among Fig. 3.

Embodiment

Below will combine embodiment and accompanying drawing that the technique effect of design of the present invention, concrete structure and generation is carried out clear, intactly description, to understand the object of the invention, characteristic and effect fully.

Fig. 3 shows the embodiment of piezoelectric energy-conversion device provided by the present invention; This multi-layer piezoelectric inverting element integral body is strip; It comprises thesandwich construction 20 that multilayer piezoelectric ceramic 3 andmulti-layered electrode layer 4 stack gradually from top to bottom; Theseelectrode layers 4 are separated into identical plurality of sections, and theelectrode layer 4 at same section that is positioned at odd-level is electrically connected each other, and theelectrode layer 4 at same section that is positioned at even level is electrically connected each other.Preferably, the last layer and the basecoat ofsandwich construction 20 all areelectrode layers 4 of segmentation, for example; As shown in Figure 3, piezoelectric ceramic 3 is range upon range of being of five storeys altogether, therefore; Interlayer adds that upper and lower surfaces has 6 layers ofelectrode layer 4 altogether, and theseelectrode layers 4 all have been split into 4 sections.Based on said structure; Through the different polarization modes of piezoelectric ceramic 3, the setting of direction and the selection of series-parallel connected mode; On single piezoelectric element, can carry out the output of voltage or electric current, adjustment, like this, when specifically being applied in the piezoelectric generating device; A plurality of energy transducers in the piezoelectric generating device are separate and be independent of each other, and can effectively avoid because the energy loss that the vibration phase difference causes.

In conjunction with Fig. 4; The polarised direction of adjacent two layers is opposite in the piezoelectric ceramic 3 of multilayer; Like the direction polarization of arrow indication among the figure, and the connected mode that at this moment adopts is: the plurality ofsections electrode layer 4 of uppermost surface has been electrically connected mutually and has been used asfirst output 41, and the plurality ofsections electrode layer 4 on orlop surface has been electrically connected mutually and has been used assecond output 42; Formation is connected in parallel, thereby obtains bigger electric current output.

In conjunction with Fig. 5; The polarised direction of adjacent two layers is opposite in the piezoelectric ceramic 3 of multilayer; Like the direction polarization of arrow indication among the figure, and the connected mode that at this moment adopts is: theelectrode layer 4 of said uppermost surface is electrically connected with theelectrode layer 4 on orlop surface successively, andelectrode layer 4 and theelectrode layer 4 of uppermost surface of scheming right-hand member on orlop surface that is arranged in left end is as twooutputs 43,44; Formation is connected in series, thereby obtains bigger voltage output.

In conjunction with Fig. 3 to Fig. 5; In the present embodiment; Preferably; Same section theelectrode layer 4 that is positioned at even level and same section theelectrode layer 4 that the is positioned at odd-level segment distance that staggers mutually, and same section theelectrode layer 4 that is positioned at even level is all in same vertical zone, and same section theelectrode layer 4 that is positioned at odd-level is all in same vertical zone.Like this, can realize the electrical connection between samesection electrode layer 4 of odd-level and even level easily.More preferably, in the present embodiment, it is to realize through perfusion conducting medium in the throughhole 5 of set inside thatelectrode layer 4 is electrically connected each other.

For the effective piezoelectric element of protection present embodiment, sintering has pottery protection surface layer on the surface of the two-layer electrode layer 4 of this last layer and/or basecoat.Pottery protection surface layer can be that segmentation covers on the electrode layer surface of each section, also can be that integral body covers on the electrode layer surface.

Certainly; The invention is not limited to above-mentioned execution mode; Those of ordinary skill in the art also can make equivalent variations or replacement under the prerequisite of spirit of the present invention, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.

Claims (10)

1. improved multi-layer piezoelectric inverting element; It is characterized in that: this multi-layer piezoelectric inverting element integral body is strip; Comprise the sandwich construction that multilayer piezoelectric ceramic and multi-layered electrode layer stack gradually from top to bottom; These electrode layers are separated into identical plurality of sections, and the electrode layer at same section that is positioned at odd-level is electrically connected each other, and the electrode layer at same section that is positioned at even level is electrically connected each other.

2. improved multi-layer piezoelectric inverting element according to claim 1; It is characterized in that: same section the electrode layer that is positioned at even level and same section the electrode layer that the is positioned at odd-level segment distance that staggers mutually; And same section the electrode layer that is positioned at even level is all in same vertical zone, and same section the electrode layer that is positioned at odd-level is all in same vertical zone.

3. improved multi-layer piezoelectric inverting element according to claim 1 and 2 is characterized in that: it is to realize through perfusion conducting medium in the through hole of set inside that said electrode layer is electrically connected each other.

4. improved multi-layer piezoelectric inverting element according to claim 1 and 2, it is characterized in that: the polarised direction of adjacent two layers is opposite in the said multilayer piezoelectric ceramic.

5. improved multi-layer piezoelectric inverting element according to claim 4 is characterized in that: the last layer and the basecoat of said sandwich construction all are electrode layers of segmentation.

6. improved multi-layer piezoelectric inverting element according to claim 5; It is characterized in that: the plurality of sections electrode layer of the said the superiors has been electrically connected mutually and has been used as an output, and said undermost plurality of sections electrode layer has been electrically connected mutually and has been used as an output.

7. improved multi-layer piezoelectric inverting element according to claim 5; It is characterized in that: the electrode layer of the said the superiors is electrically connected with undermost electrode layer successively, and the electrode layer of the superiors of undermost electrode layer and the other end that is positioned at an end is as two outputs.

8. according to the described improved multi-layer piezoelectric inverting element of claim 5, it is characterized in that: sintering has pottery protection surface layer on the surface of the two-layer electrode layer of this last layer and/or basecoat.

9. improved multi-layer piezoelectric inverting element according to claim 8 is characterized in that: the segmentation of said pottery protection surface layer covers on the electrode layer surface of each section.

10. improved multi-layer piezoelectric inverting element according to claim 8 is characterized in that: said pottery protection surface layer integral body covers on the electrode layer surface.

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