CN103837227A - Piezoelectric sensor - Google Patents
Piezoelectric sensor Download PDFInfo
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- CN103837227A CN103837227A CN201410108565.1A CN201410108565A CN103837227A CN 103837227 A CN103837227 A CN 103837227A CN 201410108565 A CN201410108565 A CN 201410108565A CN 103837227 A CN103837227 A CN 103837227A
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- piezoelectric transducer
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Abstract
The invention provides a piezoelectric sensor which comprises a piezoelectric transducer and a fixing device. The fixing device is provided with a groove, the lower portion of the piezoelectric transducer is arranged in the groove, the upper portion of the piezoelectric transducer protrudes out of the outer surface of the fixing device, and the upper portion of the piezoelectric transducer is provided with an attaching face attached to the outer wall of a GIS, so that in use, the piezoelectric transducer with the attaching face tightly attached to the outer wall of the GIS can be selected, the piezoelectric transducer is embedded in the fixing device, and then the fixing device is fixed on the surface of the outer wall of the GIS, and therefore internal discharging of the GIS can be detected and accurately located. The technical problems that in the prior art, the piezoelectric sensor only is suitable for the condition that the outer wall of the GIS is planar, and is poor in flexibility are solved.
Description
Technical field
The present invention relates to detection technique, relate in particular to a kind of piezoelectric transducer.
Background technology
Shelf depreciation is Cubicle Gas-Insulated Switchgear (Gas Insulated Switchgear, GIS) electric discharge phenomena that occur in regional area in, if shelf depreciation long-term existence, will cause the destruction of insulation, thereby cause the inner penetrability that occurs of GIS to puncture.By at GIS outer wall installation piezoelectric transducer, can utilize piezoelectric transducer to gather the acoustical signal of GIS inside in GIS realization in service, and then realize the detection of its internal discharge and accurately locate at present, find in time GIS hidden danger.
In prior art, the surface of contact of the piezoelectric transducer in piezoelectric transducer and GIS outer wall is generally plane, needs the outer wall of GIS to have the region that can fit tightly with this surface of contact, just can make piezoelectric transducer can receive stable acoustical signal.Therefore, piezoelectric transducer of the prior art is only applicable in situation that GIS outer wall is plane, very flexible.
Summary of the invention
The invention provides a kind of piezoelectric transducer, for solving in the piezoelectric transducer of the prior art situation that to be only applicable in GIS outer wall be plane, the technical matters of very flexible.
First aspect of the present invention is to provide a kind of piezoelectric transducer, comprising:
Piezoelectric transducer and stationary installation;
Described stationary installation is provided with groove, and the bottom of described piezoelectric transducer is located in described groove, and described piezoelectric transducer top protrudes from the outside surface of described stationary installation;
The top of described piezoelectric transducer be provided with for the binding face of GIS outer wall laminating.
Piezoelectric transducer as above, is also provided with the bindiny mechanism for connecting described GIS in described stationary installation.
Piezoelectric transducer as above, described bindiny mechanism comprises at least two magnet, described magnet is arranged at respectively described groove both sides, described magnet one end and described stationary installation adhesive, the described magnet other end is used for the outer wall adhesive with described GIS.
Piezoelectric transducer as above, the surface of described magnet and described GIS adhesive is cancave cambered surface.
Piezoelectric transducer as above, described binding face is cancave cambered surface.
Piezoelectric transducer as above, described piezoelectric transducer comprises shell, piezoelectric ceramics, sound absorption backing and matching layer; Described piezoelectric ceramics, sound absorption backing and matching layer are arranged at described enclosure; Described piezoelectric ceramics is arranged between described sound absorption backing and described matching layer.
Piezoelectric transducer as above, described groove is step trough, one end that described piezoelectric transducer embeds described groove is boss, the form fit of described boss and described step trough.
Piezoelectric transducer as above, the material of described piezoelectric ceramics is lead titanate ceramics; The material of described sound absorption backing is compound substance, and described compound substance comprises tungsten powder and epoxy resin; Described matching layer comprises single crystal quartz layer and silastic-layer bonded to each other.
Piezoelectric transducer as above, the material of described stationary installation is acrylonitrile-butadiene-styrene (ABS) plastics.
Piezoelectric transducer provided by the invention, comprise piezoelectric transducer and stationary installation, wherein, stationary installation is provided with groove, the bottom of piezoelectric transducer is located in groove, piezoelectric transducer top protrudes from the outside surface of stationary installation, the top of piezoelectric transducer be provided with for the binding face of GIS outer wall laminating, thereby optional use has the piezoelectric transducer of the binding face that can fit tightly with GIS outer wall in use, after this piezoelectric transducer is embedded to stationary installation, stationary installation being fixed on to GIS outer wall surface can realize the detection of its internal discharge and accurately locate again, having solved piezoelectric transducer of the prior art is only applicable in situation that GIS outer wall is plane, the technical matters of very flexible.
Brief description of the drawings
The sectional view of the piezoelectric transducer that Fig. 1 provides for one embodiment of the invention;
The front elevation of the piezoelectric transducer in the piezoelectric transducer that Fig. 2 provides for the embodiment of the present invention;
The front elevation of another two kinds of piezoelectric transducers that Fig. 3 A and Fig. 3 B provide for the embodiment of the present invention;
The sectional view of a kind of stationary installation in the piezoelectric transducer that Fig. 4 A provides for the embodiment of the present invention;
The sectional view of the another kind of stationary installation in the piezoelectric transducer that Fig. 4 B provides for the embodiment of the present invention;
The vertical view of a kind of stationary installation that Fig. 5 provides for the embodiment of the present invention;
The front elevation of the magnet that Fig. 6 provides for the embodiment of the present invention.
Embodiment
The sectional view of the piezoelectric transducer that Fig. 1 provides for one embodiment of the invention, as shown in Figure 1, the piezoelectric transducer that the present embodiment provides comprises piezoelectric transducer 1 and stationary installation 2.Piezoelectric transducer 1 embeds in above-mentioned stationary installation 2.Concrete, stationary installation 2 is provided with groove, and the bottom of piezoelectric transducer is located in groove, and piezoelectric transducer 1 top protrudes from the outside surface of stationary installation 2.The top of piezoelectric transducer 1 be provided with for the binding face of GIS outer wall laminating.
In actual applications, piezoelectric transducer 1 can be multiple, thereby different piezoelectric transducer 1 is provided with the different binding faces for fitting from different GIS outer walls.
The front elevation of the piezoelectric transducer in the piezoelectric transducer that Fig. 2 provides for the embodiment of the present invention, this piezoelectric transducer 1 is for embedding above-mentioned stationary installation 2, if GIS outer wall is convex globoidal, as shown in Figure 2, piezoelectric transducer 1 comprise for the binding face 11 of GIS outer wall laminating, and be arranged at the boss 12 of piezoelectric transducer 1 bottom, wherein, piezoelectric transducer 1 bottom embeds in stationary installation 2.
For example: binding face 11 is cambered surface, the radius-of-curvature of this cambered surface is 40mm, embeds stationary installation 2 along the short transverse of piezoelectric transducer 1, and the length of piezoelectric transducer 1 can be 40mm, the wide 30mm that can be.
It should be noted that, the binding face 11 in Fig. 2 is cancave cambered surface, thereby this binding face 11 matches with GIS outer wall, so that the binding face 11 in piezoelectric transducer 1 can fit tightly with GIS outer wall.It will be appreciated by those skilled in the art that, binding face 11 is not limited to cancave cambered surface, the front elevation of another two kinds of piezoelectric transducers that Fig. 3 A and Fig. 3 B provide for the embodiment of the present invention, as shown in Figure 3 A and Figure 3 B, if GIS outer wall is plane or other form curved surfaces, binding face 11 should be plane or other form curved surfaces mutually.
In the time that the sound source position of GIS inside is nearer apart from edge, in order better to receive acoustical signal, and sound source is accurately located, need to be near the corner of GIS or arc outer wall surface the piezoelectric transducer in the present embodiment is installed, the binding face of the piezoelectric transducer in piezoelectric transducer 1 11 and GIS corner part or arc outer wall are fitted tightly, thereby improve the auditory localization of GIS inside and the accuracy of detection.Therefore, in actual applications, can, according to the different installation sites of piezoelectric transducer, select the piezoelectric transducer 1 with different binding faces 11, thereby realize fitting tightly of binding face 11 and GIS outer wall.
Further, piezoelectric transducer comprises shell, piezoelectric ceramics, sound absorption backing and matching layer, and above-mentioned binding face 11 and boss 12 are arranged at the surface of shell, and piezoelectric ceramics, sound absorption backing and matching layer are arranged at enclosure, wherein, piezoelectric ceramics is arranged between sound absorption backing and matching layer.
Further, the material of sound absorption backing is compound substance, and this compound substance comprises tungsten powder and epoxy resin.The effect of sound absorption backing is for absorbing sound wave, prevents from entering the acoustic reflection absorbing sound in backing and gets back to the piezoelectric-array in piezoelectric transducer 1, causes interference, and reduces the acoustic coupling between each piezoelectric transducer.Can adopt using tungsten powder and epoxy resin and make sound absorption backing as the compound substance of main body, the acoustic impedance of this compound substance is moderate, when can ensureing the bandwidth of piezoelectric transducer 1, meets certain sensitivity.
Further, matching layer comprises single crystal quartz layer and silastic-layer bonded to each other.Increase in order to solve the acoustic impedance rising that sound absorption backing brings, and then the problem of the piezoelectric transducer 1 sensitivity decline causing, propagation characteristic according to sound wave in matching layer, single crystal quartz layer bonded to each other and silastic-layer are set and form this matching layer, thereby make this matching layer can reach the range of signal of 100～200KHz.
Further, the material of piezoelectric ceramics is lead titanate ceramics.The material selection lead titanates of piezoelectric transducer 1, the theoretical value of its frequency constant is 2.1MHzmm.Because the Curie point of lead titanate ceramics is higher, thereby be applicable to hot environment work, and the specific inductive capacity of lead titanate ceramics is minimum in all piezoceramic materials, again than the large order of magnitude of piezoelectric monocrystal, therefore, there is medium electrical impedance, be very suitable for the material as piezoelectric ceramics.
For example: stationary installation 2 is tabular, groove 21 is along the short transverse setting of stationary installation 2, the degree of depth of this groove 21 is set according to the height of piezoelectric transducer 1, for the piezoelectric transducer in the piezoelectric transducer providing with Fig. 1 mates, depth of groove can be set identical with the height of piezoelectric transducer 1, be 35mm, i.e. groove 21 bottom hollow outs, the signal transmssion line of piezoelectric transducer 1 can pass from groove 21 bottoms.The width of stationary installation 2 is 80mm, and length is 120mm.
The sectional view of the another kind of stationary installation in the piezoelectric transducer that Fig. 4 B provides for the embodiment of the present invention, as shown in Figure 4 B, if the groove 21 non-hollow outs in bottom can be provided at bottom portion of groove the wire hole 23 of the signal transmssion line that passes piezoelectric transducer 1.
Further, conventionally GIS outer wall is metal material, and stationary installation also comprises the magnet 22 for fixing with GIS outer wall.
Further, the number of magnet is two, and these two magnet are arranged at respectively groove 21 both sides.Concrete, the vertical view of a kind of stationary installation that Fig. 5 provides for the embodiment of the present invention, as shown in Figure 5, groove 21 is arranged at the center of stationary installation 2, and magnet 22 is symmetricly set in groove 21 both sides.
It should be noted that, the stationary installation in Fig. 5 is corresponding with the stationary installation in Fig. 4 A.
Further, magnet 22 is cancave cambered surface with the surface of GIS adhesive, and binding face 11 is also cancave cambered surface, and both have identical radius-of-curvature, are equal to the radius-of-curvature of GIS convex globoidal.
The front elevation of the magnet that Fig. 6 provides for the embodiment of the present invention, as shown in Figure 6, in the time that GIS outer wall is convex globoidal, magnet 22 is also cambered surface with GIS outer wall phase-contact surface, for example: magnet 22 is cancave cambered surface with the surface of GIS adhesive, and the radius-of-curvature of this cancave cambered surface and binding face 11 is 40mm.
Further, the material of stationary installation 2 is acrylonitrile-butadiene-styrene (ABS) plastics.The interference of the electric signal for fear of electromagnetic signal to piezoelectric transducer output, can not select metal material to make stationary installation 2, in addition, consider in the most of situation of GIS in open-air atmosphere, selected materials needs to adapt to the external environment condition variation of the condition such as humiture round the clock, and the acid-alkali salt corrosion that brings of inclement weather and air pollution, therefore, can select acrylonitrile-butadiene-styrene (ABS) plastics (Acrylonitrile Butadiene Styrene plastic, ABS) to make this stationary installation.ABS is a kind of rigid plastic, there is certain toughness simultaneously, density is about 1.04-1.06g/cm3, normal working temperature scope is-25 DEG C to 60 DEG C, and it has the superperformance such as its oil resistant and antiacid, alkali, salt and chemical reagent, also can tolerate to a certain extent the dissolving of organic solvent simultaneously, and there is good mouldability, converted products any surface finish, is easy to dyeing, and available machinery, the method such as bonding are carried out secondary processing.Due to its high comprehensive performance, so the more suitable material as stationary installation 2.
Piezoelectric transducer in the present embodiment in use, need first piezoelectric transducer 1 and stationary installation 2 to be installed: piezoelectric transducer 1 is embedded in the groove 21 of stationary installation 2, the wire hole that the signal transmssion line of piezoelectric transducer 1 is arranged from groove 21 bottoms passes, and then stationary installation 2 is coupled in to GIS outer wall, specifically can hold GIS outer wall by magnet.After installation, can detect: signal transmssion line is the electric data for detection of shelf depreciation to the transmission of multi-channel synchronous data acquisition device.
Stationary installation in the present embodiment, from GIS outer wall takes off, can be coupled to other test positions of GIS outer wall, easily again again to detect.Therefore, this piezoelectric transducer is easy to carry, simple to operate, and can plug and play.In addition, when piezoelectric transducer 1 damages, do not mate with GIS sidewall or when sensitivity, can change easily, engineering practicability is strong.
Piezoelectric transducer in the present embodiment, comprise piezoelectric transducer and stationary installation, wherein, stationary installation is provided with groove, the bottom of piezoelectric transducer is located in groove, piezoelectric transducer top protrudes from the outside surface of stationary installation, the top of piezoelectric transducer be provided with for the binding face of GIS outer wall laminating, thereby optional use has the piezoelectric transducer of the binding face that can fit tightly with GIS outer wall in use, after this piezoelectric transducer is embedded to stationary installation, stationary installation being fixed on to GIS outer wall surface can realize the detection of its internal discharge and accurately locate again, having solved piezoelectric transducer of the prior art is only applicable in situation that GIS outer wall is plane, the technical matters of very flexible.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can complete by the relevant hardware of programmed instruction.Aforesaid program can be stored in a computer read/write memory medium.This program, in the time carrying out, is carried out the step that comprises above-mentioned each embodiment of the method; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above each embodiment, only in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to aforementioned each embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or some or all of technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a piezoelectric transducer, is characterized in that, comprising:
Piezoelectric transducer and stationary installation;
Described stationary installation is provided with groove, and the bottom of described piezoelectric transducer is located in described groove, and described piezoelectric transducer top protrudes from the outside surface of described stationary installation;
The top of described piezoelectric transducer be provided with for the binding face of GIS outer wall laminating.
2. piezoelectric transducer according to claim 1, is characterized in that, is also provided with the bindiny mechanism for connecting described GIS in described stationary installation.
3. piezoelectric transducer according to claim 2, it is characterized in that, described bindiny mechanism comprises at least two magnet, and described magnet is arranged at respectively described groove both sides, described magnet one end and described stationary installation adhesive, the described magnet other end is used for the outer wall adhesive with described GIS.
4. piezoelectric transducer according to claim 3, is characterized in that, the surface of described magnet and described GIS adhesive is cancave cambered surface.
5. according to the piezoelectric transducer described in claim 1-4 any one, it is characterized in that, described binding face is cancave cambered surface.
6. according to the piezoelectric transducer described in claim 1-4 any one, it is characterized in that, described piezoelectric transducer comprises shell, piezoelectric ceramics, sound absorption backing and matching layer;
Described piezoelectric ceramics, sound absorption backing and matching layer are arranged at described enclosure;
Described piezoelectric ceramics is arranged between described sound absorption backing and described matching layer.
7. according to the piezoelectric transducer described in claim 1-4 any one, it is characterized in that, described groove is step trough, and the bottom that described piezoelectric transducer embeds described groove is provided with boss, the form fit of described boss and described step trough.
8. piezoelectric transducer according to claim 6, is characterized in that, the material of described piezoelectric ceramics is lead titanate ceramics; The material of described sound absorption backing is compound substance, and described compound substance comprises tungsten powder and epoxy resin; Described matching layer comprises single crystal quartz layer and silastic-layer bonded to each other.
9. according to the piezoelectric transducer described in claim 1-4 any one, it is characterized in that, the material of described stationary installation is acrylonitrile-butadiene-styrene (ABS) plastics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108565.1A CN103837227A (en) | 2014-03-21 | 2014-03-21 | Piezoelectric sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410108565.1A CN103837227A (en) | 2014-03-21 | 2014-03-21 | Piezoelectric sensor |
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|---|---|
| CN103837227A true CN103837227A (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410108565.1A Pending CN103837227A (en) | 2014-03-21 | 2014-03-21 | Piezoelectric sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107116018A (en) * | 2017-04-11 | 2017-09-01 | 中国科学院声学研究所 | It is a kind of to be directed to the energy converting system that wireless power transfer is carried out every metallic plate |
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| CN101625337A (en) * | 2009-07-31 | 2010-01-13 | 广东电网公司电力科学研究院 | Circumferential wave guide energy converter with adjustable incident angle |
| CN102305881A (en) * | 2011-05-25 | 2012-01-04 | 北京兴迪仪器有限责任公司 | Adsorption device for acoustic emission sensor |
| CN202383241U (en) * | 2011-12-23 | 2012-08-15 | 保定天威集团有限公司 | Ultrahigh-frequency sensor for detecting GIS partial discharge |
| CN202647143U (en) * | 2012-06-30 | 2013-01-02 | 华北电力大学（保定） | Square plane ultrasonic array sensor fixing device |
| CN203837810U (en) * | 2014-03-21 | 2014-09-17 | 国家电网公司 | Piezoelectric sensor |
-
2014
- 2014-03-21 CN CN201410108565.1A patent/CN103837227A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101625337A (en) * | 2009-07-31 | 2010-01-13 | 广东电网公司电力科学研究院 | Circumferential wave guide energy converter with adjustable incident angle |
| CN102305881A (en) * | 2011-05-25 | 2012-01-04 | 北京兴迪仪器有限责任公司 | Adsorption device for acoustic emission sensor |
| CN202383241U (en) * | 2011-12-23 | 2012-08-15 | 保定天威集团有限公司 | Ultrahigh-frequency sensor for detecting GIS partial discharge |
| CN202647143U (en) * | 2012-06-30 | 2013-01-02 | 华北电力大学（保定） | Square plane ultrasonic array sensor fixing device |
| CN203837810U (en) * | 2014-03-21 | 2014-09-17 | 国家电网公司 | Piezoelectric sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107116018A (en) * | 2017-04-11 | 2017-09-01 | 中国科学院声学研究所 | It is a kind of to be directed to the energy converting system that wireless power transfer is carried out every metallic plate |
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Application publication date: 20140604 |
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