CN103579492A - Piezoelectricity executive component - Google Patents
Piezoelectricity executive component Download PDFInfo
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- CN103579492A CN103579492A CN201310581376.1A CN201310581376A CN103579492A CN 103579492 A CN103579492 A CN 103579492A CN 201310581376 A CN201310581376 A CN 201310581376A CN 103579492 A CN103579492 A CN 103579492A
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- piezoelectric
- interior electrode
- electrode
- joint face
- piezoelectric patches
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Abstract
The invention relates to a piezoelectricity executive component, in particular to a mechanical structure used for having control over fluid of an ejector, and belongs to the technical field of piezoelectricity. The piezoelectricity executive component comprises a plurality of piezoelectric plates, inner electrodes and outer electrodes, wherein each piezoelectric plate is arranged vertically, the piezoelectric plates are connected in a stacking mode in sequence in the horizontal direction, one of the left surface and the right surface of each piezoelectric plate serves as an inner electrode connecting surface, all the inner electrode connecting surfaces of the piezoelectric plates are arranged on the surfaces of the same side, the inner electrodes are connected to the inner electrode connecting faces, the front surfaces and the rear surfaces of the piezoelectric plates all serve as outer electrode connecting surfaces, the outer electrodes are connected to the outer electrode connecting faces, the inner side faces of outer electrodes on the front surfaces of the piezoelectric plates are connected with inner electrodes on the same side, the inner side faces of outer electrodes on the rear surfaces of the piezoelectric plates are connected with inner electrodes on the same side, and the outer side faces of the outer electrodes on the front surfaces and the rear surfaces of the piezoelectric plates are connected with an external power source through wires respectively. According to the piezoelectricity executive component, the number of the stacked piezoelectric plates is greatly reduced, the potential safety hazard in the process of manufacturing and use of the piezoelectricity executive component is reduced, the manufacturing cost is reduced, and batch production and application can be achieved.
Description
Technical field
The present invention relates to a kind of piezoelectric-actuator, for controlling the mechanical structure of the fluid of injector, belong to piezo technology field specifically.
Background technology
In prior art, according to the piezoelectric property of piezoelectric, when piezoelectric is loaded to certain external voltage, piezoelectric can produce the mechanical dimension distortion of certain orientation, and this distortion can produce overcoming under the condition of sizable power.And when external voltage is removed, piezoelectric can be returned to the size state before on-load voltage exactly.Actuating force is large owing to having for the piezoelectric-actuator of making of piezoelectric, response rapidly and return advantage accurately, be particularly useful for fast and accurately in switching process, in the mechanisms such as injector of fuel injection device for I. C. Engine.
A kind of piezoelectric-actuator body is disclosed in CN00800631.8, it has the executive component body of the laminar structure form of a multilayer, this laminar structure consists of many stacked piezoelectric material layers and therebetween conductive layer, when piezoelectric-actuator body is applied to pulse voltage, it carries out pulsation stroke under the spacer conditions changing between its two ends.
Similarly piezoelectric-actuator body has many disclosed narrations in the patents such as CN200480030282.4, they have a common feature in structure and control, while exactly piezoelectric element body being applied to pulse voltage, utilization is extended and is shunk along the size (lift) of single piezoelectric patches stack direction, realizes the control to control valve or similar means.Because the unit energising elongation of current piezoelectric is limited, therefore above-mentioned piezoelectric-actuator body all needs to have the piezoelectric patches of One's name is legion to carry out lamination, just there are two shortcomings in this: the one, because the piezoelectric patches quantity of piezoelectric-actuator body lamination is many, manufacture and use procedure in occur that the probability of the potential safety hazards such as cracking between piezoelectric patches, disconnection is large; The 2nd, numerous number of laminations has increased manufacture difficulty and cost, and above-mentioned two shortcomings seem particularly serious in extensive manufacture and application.
Summary of the invention
The object of the invention is to overcome above-mentioned weak point, thereby the piezoelectric-actuator that provides a kind of number of laminations significantly to reduce, reduce the potential safety hazard in piezoelectric-actuator manufacture and use procedure, and reduce manufacturing cost, thereby more easily realize batch production and application.
According to technical scheme provided by the invention, piezoelectric-actuator comprises a plurality of piezoelectric patches, interior electrode and external electrode, it is characterized in that: each piezoelectric patches vertically arranges, and a plurality of piezoelectric patches stack gradually connection along horizontal direction; One side in the surface, left and right of each piezoelectric patches is interior electrode joint face, and the interior electrode joint face of a plurality of piezoelectric patches is surface, the same side, and interior electrode joint face is provided with interior electrode; The front and rear surfaces of a plurality of piezoelectric patches is external electrode joint face, on external electrode joint face, connects external electrode; The medial surface of the external electrode in the front and rear surfaces of a plurality of piezoelectric patches is connected with the interior electrode of this side respectively, and the lateral surface of the external electrode in the front and rear surfaces of a plurality of piezoelectric patches is connected with external power source by wire respectively.
Further, interior electrode is rectangle plane.The very latticed flexible electrode of dispatch from foreign news agency, can stretch.
Further, interior electrode upper is positioned at its place electrode joint face below upper below within, and the upper of interior electrode do not overlap below with the upper of interior electrode joint face below; Within the limit, left and right of interior electrode is positioned at the limit, left and right of its place electrode joint face, and electrode fillet in the one side in limit, interior electrode left and right overlaps with interior electrode joint face same side and forms, does not overlap with interior electrode joint face same side with the another side of interior electrode fillet in limit, interior electrode left and right relatively; Adjacent interior electrode fillet arranges at adjacent piezoelectric patches left and right sides interval.In the area S1 of interior electrode and its place, the proportion of the area S2 of electrode joint face is 0.5<S1:S2<1.
Compared with the prior art the present invention has the following advantages: the present invention is simple in structure, compact, reasonable, and number of laminations significantly reduces, and reduces the potential safety hazard in piezoelectric-actuator manufacture and use procedure; Meanwhile, reduce manufacturing cost, can realize batch production and application.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is piezoelectric patches structural representation.
Fig. 3 is that piezoelectric patches applies voltage pre-structure schematic diagram.
Fig. 4 is that piezoelectric patches applies structural representation after voltage.
Fig. 5 is AA cutaway view in Fig. 1.
Fig. 6 is the piezoelectric-actuator structural representation of prior art.
Fig. 7 is the piezoelectric patches structural representation of prior art.
Fig. 8 is BB cutaway view in Fig. 6.
Description of reference numerals: piezoelectric patches, 1b-that 1-piezoelectric patches, 1a-apply before voltage apply the voltage interior electrode of piezoelectric patches, 2-, 3-external electrode, the interior electrode joint face of 4-, the interior electrode fillet of 5-, 6-external electrode joint face, 7-wire afterwards.
Embodiment
The present invention is below further described in connection with the embodiment in accompanying drawing:
As shown in Fig. 1～2, the present invention mainly comprises a plurality of piezoelectric patches 1, interior electrode 2 and external electrode 3, and each piezoelectric patches 1 vertically arranges, and a plurality of piezoelectric patches 1 stack gradually connection along horizontal direction.
As shown in Figure 5, the one side in the surface, left and right of each piezoelectric patches 1 is interior electrode joint face 4, and the interior electrode joint face 4 of a plurality of piezoelectric patches 1 is surface, the same side.
As shown in Fig. 2 and 5, described interior electrode joint face 4 is provided with interior electrode 2, and interior electrode 2 is rectangle plane.Interior electrode 2 upper is positioned at its place electrode joint face 4 below upper below within, and the upper of interior electrode 2 do not overlap below with the upper of interior electrode joint face 4 below.Within the limit, left and right of interior electrode 2 is positioned at the limit, left and right of its place electrode joint face 4, and electrode fillet 5 in the one side in interior electrode 2 limits, left and right overlaps with interior electrode joint face 4 same side and forms, does not overlap with interior electrode joint face 4 same side with the another side of interior electrode fillet 5 in interior electrode 2 limits, left and right relatively.In the area S1 of described interior electrode 2 and its place, the proportion of the area S2 of electrode joint face 4 is 0.5<S1:S2<1.Adjacent interior electrode fillet 5 arranges at adjacent piezoelectric patches 1 left and right sides interval.
As shown in Fig. 1 and 5, the front and rear surfaces of a plurality of piezoelectric patches 1 is external electrode joint face 6, connects external electrode 3 on external electrode joint face 6.The medial surface of the external electrode 3 in the front and rear surfaces of a plurality of piezoelectric patches 1 is connected with the interior electrode 2 of this side respectively.Described external electrode 3 is latticed flexible electrode, can stretch.The lateral surface of the external electrode 3 in the front and rear surfaces of a plurality of piezoelectric patches 1 is connected with external power source by wire 7 respectively.
Suppose that the voltage swing that is carried in piezoelectric patches 1 is V, after on-load voltage, piezoelectric patches 1 Width produces elongation strain, and deflection is Δ W, in length and Width, has produced contraction distortion, and deflection is respectively Δ L and Δ H.The large I of Δ W, Δ L, Δ H calculates according to piezoelectric equations.The boundary condition of piezoelectric patches 1 is approximately mechanical freedom and electrical short in the present invention, by first kind piezoelectric equations, can be obtained:
S=dE，
Wherein S is strain, and d is piezoelectric strain constant (unit is m/v), and E is electric field strength (unit is v/m), wherein
So strain S of Width
wfor
(d wherein
33for longitudinal piezoelectric strain constant), draw Δ W=Vd
33;
The strain S of short transverse
hfor
(d wherein
31for horizontal piezoelectric strain constant), draw
From derivation above, can find out, the elongation strain Δ W longitudinally producing during 1 energising of single piezoelectric patches depends on two parameters: the size of the size of driving voltage and longitudinal piezoelectric strain constant of material, and the size of cross-direction shrinkage distortion depends on three parameters: the size of driving voltage, laterally the size of piezoelectric strain constant and piezoelectric patches laterally/size of longitudinal length ratio; And the size of the contraction distortion Δ H producing in H direction depends on the horizontal piezoelectric strain constant d of piezoelectric patches 1
31, height dimension H/ width dimensions W ratio, be carried in the voltage V on electrode 26.
The piezoelectric-actuator using in the piezoelectric type fuel injector of prior art (being also injection valve, injector etc.) as shown in Figure 6 and Figure 7, is that the linear deformation producing while having utilized piezoelectric patches 1 energising realizes the control to fuel injector.Longitudinal piezoelectric strain constant d due at present conventional piezoelectric
33size be 500～800(10
-12m/v) left and right, and on the driving voltage that piezoelectric can work, be limited to about 200V, the elongation strain that therefore single piezoelectric patches produces is 10
-1um left and right, is 50um if control the needed total deformation of fuel injector work, and the piezoelectric-actuator of prior art will carry out the piezoelectric patches lamination of 500 left and right (or more).
In piezoelectric-actuator according to the present invention, the contraction distortion size that piezoelectric patches 1 energising produces is
according to studies show that, the horizontal piezoelectric strain constant d of the piezoelectric smart material of associated mechanisms exploitation at present
31can reach 500(10
-12m/V), therefore, when piezoelectric patches 1 height dimension H long enough,
when enough large, when loading certain voltage, piezoelectric-actuator just can produce enough height dimension contraction distortions, thereby by the structural design of fuel injector, utilizes this axial dimension contraction distortion to realize the injection control to fuel injector.So, piezoelectric-actuator designed according to this invention only need to be by increasing piezoelectric patches 1 lamination of some, guarantee the intensity of piezoelectric-actuator, the quantity that outstanding advantages of the present invention shows as its lamination prior art of comparing can reduce by an order of magnitude.
In piezoelectric-actuator of the present invention, piezoelectric patches number of laminations significantly reduces, and reduces the potential safety hazard in piezoelectric-actuator manufacture and use procedure; Meanwhile, reduce manufacturing cost, can realize batch production and application.
Claims (5)
1. a piezoelectric-actuator, comprises a plurality of piezoelectric patches (1), interior electrode (2) and external electrode (3), it is characterized in that: each piezoelectric patches (1) vertically arranges, and a plurality of piezoelectric patches (1) stack gradually connection along horizontal direction; One side in the surface, left and right of each piezoelectric patches (1) is interior electrode joint face (4), and the interior electrode joint face (4) of a plurality of piezoelectric patches (1) is surface, the same side, and interior electrode joint face (4) is provided with interior electrode (2); The front and rear surfaces of a plurality of piezoelectric patches (1) is external electrode joint face (6), the upper external electrode (3) that connects of external electrode joint face (6); The medial surface of the external electrode (3) in the front and rear surfaces of a plurality of piezoelectric patches (1) is connected with the interior electrode (2) of this side respectively, and the lateral surface of the external electrode (3) in the front and rear surfaces of a plurality of piezoelectric patches (1) is connected with external power source by wire (7) respectively.
2. piezoelectric-actuator as claimed in claim 1, is characterized in that: described interior electrode (2) is rectangle plane.
3. piezoelectric-actuator as claimed in claim 1, is characterized in that: described external electrode (3) is latticed flexible electrode, can stretch.
4. piezoelectric-actuator as claimed in claim 1, it is characterized in that: described interior electrode (2) upper is positioned at its place electrode joint face (4) below upper below within, and interior electrode (2) upper below and upper the coincidence below of interior electrode joint face (4); Within the limit, left and right of interior electrode (2) is positioned at the limit, left and right of its place electrode joint face (4), and electrode fillet (5) in the one side in interior electrode (2) limit, left and right overlaps with interior electrode joint face (4) same side and forms, does not overlap with interior electrode joint face (4) same side with the another side of interior electrode fillet (5) in interior electrode (2) limit, left and right relatively; Adjacent interior electrode fillet (5) arranges at adjacent piezoelectric patches (1) left and right sides interval.
5. piezoelectric-actuator as claimed in claim 1, is characterized in that: in the area S1 of described interior electrode (2) and its place, the proportion of the area S2 of electrode joint face (4) is 0.5<S1:S2<1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310581376.1A CN103579492A (en) | 2013-11-19 | 2013-11-19 | Piezoelectricity executive component |
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| CN201310581376.1A CN103579492A (en) | 2013-11-19 | 2013-11-19 | Piezoelectricity executive component |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684239A (en) * | 2017-01-09 | 2017-05-17 | 武汉大学 | Extension type laminated piezoelectric actuator |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313641A (en) * | 1999-09-30 | 2001-09-19 | Tdk株式会社 | Multi-layer piezoelectric device and manufacture thereof |
| EP2071644A1 (en) * | 2007-12-13 | 2009-06-17 | Robert Bosch Gmbh | Device with a piezoelectric actuator having a plurality of active regions and/or additional sensor regions |
| CN101679122A (en) * | 2007-06-15 | 2010-03-24 | 株式会社村田制作所 | Piezoelectric ceramic composition and piezoelectric-ceramic electronic part |
| CN103069599A (en) * | 2010-09-14 | 2013-04-24 | 太阳诱电株式会社 | Piezoelectric element, and stacked piezoelectric structure |
| US20130107422A1 (en) * | 2011-11-02 | 2013-05-02 | Samsung Electro-Mechanics Co., Ltd. | Multilayered ceramic electronic component and fabrication method thereof |
-
2013
- 2013-11-19 CN CN201310581376.1A patent/CN103579492A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313641A (en) * | 1999-09-30 | 2001-09-19 | Tdk株式会社 | Multi-layer piezoelectric device and manufacture thereof |
| CN101679122A (en) * | 2007-06-15 | 2010-03-24 | 株式会社村田制作所 | Piezoelectric ceramic composition and piezoelectric-ceramic electronic part |
| EP2071644A1 (en) * | 2007-12-13 | 2009-06-17 | Robert Bosch Gmbh | Device with a piezoelectric actuator having a plurality of active regions and/or additional sensor regions |
| CN103069599A (en) * | 2010-09-14 | 2013-04-24 | 太阳诱电株式会社 | Piezoelectric element, and stacked piezoelectric structure |
| US20130107422A1 (en) * | 2011-11-02 | 2013-05-02 | Samsung Electro-Mechanics Co., Ltd. | Multilayered ceramic electronic component and fabrication method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106684239A (en) * | 2017-01-09 | 2017-05-17 | 武汉大学 | Extension type laminated piezoelectric actuator |
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Owner name: CHINA FAW GROUP CORPORATION Effective date: 20140530 |
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Effective date of registration: 20140530 Address after: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Applicant after: Wuxi Oil Pump Nozzle Institute of First Automobile Works Applicant after: China FAW Group Corporation Address before: 214063 Jiangsu province Binhu District of Wuxi City Qian Rong Lu No. 15 Applicant before: Wuxi Oil Pump Nozzle Institute of First Automobile Works |
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Application publication date: 20140212 |