CN206854039U - A kind of alliteration journey bimorph ultrasonic transducer - Google Patents
A kind of alliteration journey bimorph ultrasonic transducer Download PDFInfo
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- CN206854039U CN206854039U CN201720131551.0U CN201720131551U CN206854039U CN 206854039 U CN206854039 U CN 206854039U CN 201720131551 U CN201720131551 U CN 201720131551U CN 206854039 U CN206854039 U CN 206854039U
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Abstract
A kind of alliteration journey bimorph ultrasonic transducer, including shell, annular boss is set on shell, circular trough is opened up on annular boss, annular mounting groove is opened up at annular boss outer wall, the auxiliary piezoelectric patches of installation annular in annular mounting groove, the upper surface of the auxiliary piezoelectric patches of annular sets auxiliary piezoelectric sealed acoustic impedance matching layer, the circular main piezoelectric patches of installation in circular trough, the upper surface of circular main piezoelectric patches sets main piezoelectric sealed acoustic impedance matching layer, the internal diameter of the auxiliary piezoelectric patches of annular is more than the diameter of circular main piezoelectric patches, circular main piezoelectric patches sets fixed range with the auxiliary piezoelectric patches of annular in vertical direction, the first fairlead is opened up in the middle part of annular boss, first wire is set in the first fairlead, first wire is located at housing exterior through shell, outer casing underpart fills adhesive layer.Because the utility model can utilize the path difference accurate measurement of main and auxiliary piezoelectric patches obtain the static velocity of sound of medium, thus can accurate measurement obtain the flow velocity of medium, so as to improve the accuracy of measurement of ultrasonic wave gas meter.
Description
Technical field
Transducer is the utility model is related to, is a kind of alliteration journey bimorph ultrasonic transducer.
Background technology
The application of transducer is wide, and the transducer architecture used in different field has very big difference.It is special at present
The ordinary ultrasonic wave transducer of flow is measured in ultrasonic wave gas meter, because combustion gas component, pressure, temperature change at any time,
Therefore, the extremely difficult acquisition of the static velocity of sound of medium, and the static velocity of sound for accurately obtaining medium is the indispensability of accurate measurement gas flow
Condition.The method that the single-chip ultrasonic transducer that in the market generally uses obtains the medium velocity of sound is the transmitting by improving ultrasonic wave
Power receives the amplitude of Mintrop wave to improve, and reception signal is sampled using high-speed ADC, then estimates and speaks from the waveform of reception
In the propagation time of super ripple, then further calculate the velocity of sound.The deficiency of this structure is that emitting voltage is high, and power consumption is larger, peace
Full property is relatively low, high-speed ADC it is expensive, in addition, CPU necessarily requires to complete in a short time when handling, to CPU performance
It is required that higher, Small flowrate measurement error is larger, and Qmin errors are typically in 3%-5% or so.
Utility model content
The purpose of this utility model is to provide a kind of alliteration journey bimorph ultrasonic transducer, and it uses bimorph,
Alliteration journey is produced in media as well, fixed path difference be present between main and auxiliary piezoelectric patches, acoustic velocity measutement is carried out with path difference, so as to
Reach the purpose of the accurate measurement static velocity of sound of medium, to solve the deficiencies in the prior art.
The utility model to achieve the above object, by the following technical programs：A kind of alliteration journey bimorph ultrasonic waves
Can device, including shell, annular boss is set on shell, circular trough is opened up on annular boss, annular is opened up at annular boss outer wall
Mounting groove, the auxiliary piezoelectric patches of the interior installation annular of annular mounting groove, the upper surface of the auxiliary piezoelectric patches of annular sets auxiliary piezoelectric sealed acoustic impedance
Matching layer, the circular main piezoelectric patches of the interior installation of circular trough, the upper surface of circular main piezoelectric patches set the piezoelectric sealed acoustic impedance match of master
Layer, the internal diameter of the auxiliary piezoelectric patches of annular are more than the diameter of circular main piezoelectric patches, and circular main piezoelectric patches is with the auxiliary piezoelectric patches of annular vertical
Direction sets fixed range, and the first fairlead is opened up in the middle part of annular boss, the first wire, the first wire are set in the first fairlead
It is located at housing exterior, outer casing underpart filling adhesive layer through shell.The upper edge of annular boss is higher than the upper edge of shell, annular
Boss outer surface of upper is circular conical surface.In the bottom of the circular conical surface and the upper edge of shell are generally aligned in the same plane.Annular installation
The second fairlead is opened up in groove, the second wire is set in the second fairlead, second wire one end is located at outside shell through adhesive layer
Portion.The main piezoelectric patches of circle and the auxiliary piezoelectric patches of annular are made by piezoelectric crystal material or piezoceramic material.Circle is main
The center line of the center line of piezoelectric patches and the auxiliary piezoelectric patches of annular is same center line.The upper table of main piezoelectric sealed acoustic impedance matching layer
Face sets fixed distance with auxiliary piezoelectric sealed acoustic impedance match interlayer.
The utility model has the advantage of：It is using circular main piezoelectric patches, auxiliary two piezoelectric patches of piezoelectric patches of annular, in ultrasound
Make to produce two sound paths in measured medium when using in ripple gas meter, flow meter, with the static sound of sound path difference measurements medium between two sound paths
Speed, so as to measure gas flow.It is described in the utility model to carry circular main piezoelectric patches and auxiliary two piezoelectric patches of piezoelectric patches of annular
Transducer architecture, a fixed range can be differed on sonic propagation direction, this distance is in the most short wave length of sound of medium
（N+x）Times, optimal design is N=0, between x=0.6 to 0.8, that is, in a wavelength.Transducer is mounted in flow velocity when using
In shielded-plate tube, the both ends installation transducer of flow velocity shielded-plate tube, can shape before transducer due to the shielding action of flow velocity shielded-plate tube
Into the region that velocity of medium is 0, due to the presence of main and auxiliary piezoelectric patches between two transducers, two sound paths can be formed, it is main
The length of sound path is less than the length of auxiliary sound path, in the sound wave difference journey between the main and auxiliary piezoelectric patches on same transducer, due to
The effect of flow velocity shielded-plate tube, velocity of medium is 0 in sound wave difference journey, the signal phase received by measuring main and auxiliary piezoelectric patches
Time difference, it is possible to the accurate velocity of sound is calculated according to main and auxiliary path difference, because velocity of medium is 0 in this segment difference journey, therefore
It is exactly the static velocity of sound of medium to measure the obtained velocity of sound.Because the utility model can utilize the path difference of main and auxiliary piezoelectric patches accurate
Measurement obtains the static velocity of sound of medium, thus can accurate measurement obtain the flow velocity of medium, so as to improve ultrasonic wave gas meter
Accuracy of measurement.
Transducer of the present utility model is arranged on the both ends in gas or fluid line, when the circle of one of transducer
During main piezoelectric patches transmitting ultrasonic wave, the circular main piezoelectric patches of another transducer first receives ultrasonic signal, then annular auxiliary
Piezoelectric patches receives signal again, so, one is produced between the circular main piezoelectric patches and the auxiliary piezoelectric patches of annular of another transducer
Path difference, there is a time difference between the signal received.Circular main piezoelectric patches, the signal of the auxiliary piezoelectric patches of annular pass through " zero passage "
After shaping, the time difference can be accurately measured with phase discriminator, then further according to circular main piezoelectric patches, the sound of the auxiliary piezoelectric patches of annular
Path difference calculates the velocity of sound of medium, because the velocity of medium between the circular main piezoelectric patches and the auxiliary piezoelectric patches of annular of transducer is zero, surveys
The velocity of sound measured is exactly velocity of sound when medium is static.The precision of the digital phase discriminator of current pulse expansion can accomplish 0.1ns-
0.3ns, when the path difference of circular main piezoelectric patches, the auxiliary piezoelectric patches of annular is 2mm, the measurement accuracy of the velocity of sound can reach 0.01-
0.05m/s.After testing, flow measurement error when transducer of the present utility model is applied in ultrasonic wave gas meter is 0.1%-
0.4%.Transducer described in the utility model only needs the emitting voltage within 24V, safe to use, low in energy consumption, the electricity being related to
Road operating voltage range is in the range of high-voltage CMOS, it is easy to accomplish ultrasonic wave gas meter dedicated processes circuit it is integrated, to CPU
It is required that it is low, reception signal can all be compared using " zero passage ", then carry out the measurement that pulse expansion phase demodulation realizes the time difference,
Processing of circuit is simple, and manufacturing cost is low etc..
Brief description of the drawings
Accompanying drawing 1 is structural representation of the present utility model；Accompanying drawing 2 is Fig. 1 overlooking the structure diagram；Accompanying drawing 3 is this reality
The structural representation in flow velocity shielded-plate tube is arranged on new transducer, signal the utility model transducer shields installed in flow velocity
Use state in pipe, A and B represents two transducers, L respectively in figure1Represent circular main piezoelectric patches and B transducings in A transducers
Caused main sound path, L between circular main piezoelectric patches in device2Represent annular in circular main piezoelectric patches and B transducers in A transducers
Caused auxiliary sound path between auxiliary piezoelectric patches.
Embodiment
Control accompanying drawing is described further to the utility model.
A kind of alliteration journey bimorph ultrasonic transducer described in the utility model, including shell 1, set on shell 1
Annular boss 14, circular trough 4 is opened up on annular boss 14, annular mounting groove 3, annular mounting groove are opened up at the outer wall of annular boss 14
The auxiliary piezoelectric patches 5 of installation annular in 3, the upper surface of the auxiliary piezoelectric patches 5 of annular set auxiliary piezoelectric sealed acoustic impedance matching layer 6, circular trough 4
The interior circular main piezoelectric patches 7 of installation, the upper surface of circular main piezoelectric patches 7 set main piezoelectric sealed acoustic impedance matching layer 8, the auxiliary pressure of annular
The internal diameter of electric piece 5 is more than the diameter of circular main piezoelectric patches 7, and circular main piezoelectric patches 7 is set with the auxiliary piezoelectric patches 5 of annular in vertical direction
Fixed range, the middle part of annular boss 14 open up the first fairlead 10, the first wire 13, the first wire are set in the first fairlead 10
13 are located at outside shell 1 through shell 1, the under-filled adhesive layer 9 of shell 1.
Transducer described in the utility model inserts flow velocity shielded-plate tube both ends, and main sound is produced between two main piezoelectric patches of circle
Journey, auxiliary sound path is produced between the main piezoelectric patches of a circle and another auxiliary piezoelectric patches of annular, two sound paths have a path difference, sound path
Difference selection is medium minimum wave length of sound（N+x）Times, N round numbers, decimals of the x between 0-1, optimal selection N=0, x=
0.6-0.8, the time difference t that major-minor piezoelectric patches receives signal can be measured by phase discriminator in circuit board, then with formula c=
L/t cans calculate the velocity of sound of medium（T is that major-minor signal time is poor, and L is the path difference of major-minor piezoelectric patches, and c is sound wave speed
Degree）, then by detecting gas flow after CPU computings.Transducer described in the utility model is inserted one in flow velocity shielded-plate tube
End or both ends, the other end of flow velocity shielded-plate tube can also install known single piezoelectric patches transducer, and this mounting structure also can be surveyed accurately
The velocity of sound is measured, it is identical with using two array operations described in the utility model.The circle of transducer described in the utility model is main
Piezoelectric patches signal can use " zero passage " shaping, and transducer signal has two effects at work, first be the measurement medium velocity of sound,
Second is the propagation time for measuring sound wave along the positive and negative both direction in media flow direction（Sonication times difference method flowmeter）, sound
Speed measurement be the signal by the major-minor piezoelectric patches on same transducer come what is realized, method is as follows：Due to circular main piezoelectric patches
It is less than the minimum wave length of sound of quiescent atmosphere, therefore circular main piezoelectric patches and the auxiliary piezoelectricity of annular with the path difference of the auxiliary piezoelectric patches of annular
The signal of piece only need to carry out after zero passage shaping digital phase-detecting can be obtained by two signals precise time it is poor, Ran Hougen
The accurate velocity of sound is calculated according to path difference；Positive and negative acoustic transit time difference measurements are flowed to along medium：Only need to be to the circle of receive transducer
The main piezoelectric patches reception signal of shape carries out zero passage shaping, then obtains ultrasonic propagation and reference pulse compared with reference pulse is carried out
Between time difference, time and tide compared with same reference pulse, can obtain ultrasonic wave along media flow direction and
Against the propagation time difference in media flow direction, media flow speed is then calculated according to the static velocity of sound of medium.Due to this practicality
It is new then to carry out the measurement that pulse expansion phase demodulation realizes the time difference again to reception signal all using Zero-cross comparator, because
This, can simplify circuit design, and can reach the high requirement of precision.
The upper edge of annular boss 14 described in the utility model is higher than the upper edge of shell 1, the upper outer of annular boss 14
Face is circular conical surface 12, and the bottom of circular conical surface 12 is generally aligned in the same plane interior with the upper edge of shell 1.The utility model uses circular conical surface
12, ultrasonic wave is blocked for reducing, improves the intensity of annular Secondary piezoelectric piece reception signal.
Further program of the utility model is：The second fairlead 11 is opened up in annular mounting groove 3, in the second fairlead 11
Second wire is set, and second wire one end is located at outside shell 1 through adhesive layer 9.
The preferable scheme of the utility model is：The main piezoelectric patches 7 of circle and the auxiliary piezoelectric patches 5 of annular are by piezo-electric crystal material
Material or piezoceramic material are made.
The further preferred scheme of the utility model is：Circular main piezoelectric patches 7 is patty, and the auxiliary piezoelectric patches 5 of annular is ring
Cheese, circular main piezoelectric patches and the auxiliary piezoelectric patches parallel coaxial installation of annular, mutual distance（N+x）Times medium minimum sound wave ripple
Long, this shape and mounting means minimize wall and corner effect, acoustic emission is further ensured that survey with receiving symmetrically and evenly
Accuracy of measurement.
The center line of the center line of the main piezoelectric patches 7 of circle described in the utility model and the auxiliary piezoelectric patches 5 of annular is same center
Line.It can be further ensured that circular main piezoelectric patches 7, auxiliary 5 two piezoelectric patches of piezoelectric patches of annular are in spatially the state that is parallel to each other,
Caused sound path is accurate, and a fixed range is differed on Acoustic Wave Propagation direction, further improves measurement accuracy.
The upper surface of the piezoelectric sealed acoustic impedance matching layer 8 of master described in the utility model and auxiliary piezoelectric sealed acoustic impedance matching layer
Fixed range is set between 6.This distance is the path difference between circular main piezoelectric patches and the auxiliary piezoelectric patches of annular, takes (the N+ of wavelength
X) again, wherein N round numbers, decimals of the x between 0-1, preferred plan is N=0, and x takes 0.6-0.8.Such as：Assuming that ultrasonic wave frequency
Rate select 150KHZ, if the minimum wavelength of measured medium is 2.5mm, then major-minor path difference can select be：1.5 -
2mm。
Transducer described in the utility model, two the utility model transducers are separately mounted to flow velocity shielded-plate tube during use
Both ends, or one end uses transducer of the prior art, makes two main piezoelectric patches of circle on transducer towards in pipeline
Main sound path is produced between the circular main electric piece of the circular main piezoelectric patches and offside transducer of side, wherein side transducer, with annular
Auxiliary sound path is formed between auxiliary piezoelectric patches, circular main pressure on path difference, that is, transducer between main sound path and auxiliary sound path be present
The distance between piece and the auxiliary piezoelectric patches of annular difference, using the signal time between the circular main piezoelectric patches of measurement and the auxiliary piezoelectric patches of annular
Difference, the static velocity of sound of measured medium is then calculated further according to the path difference between main and auxiliary piezoelectric patches, is then changed further according to two
Can between device between circular main piezoelectric patches measurement obtain it is poor along the sonication times of the positive anti-spread in media flow direction, further according to Jie
The static velocity of sound of matter calculates media flow speed, so as to complete the measurement of gas flow.
Claims (7)
- A kind of 1. alliteration journey bimorph ultrasonic transducer, it is characterised in that：Including shell（1）, shell（1）It is upper that annular is set Boss（14）, annular boss（14）On open up circular trough（4）, annular boss（14）Annular mounting groove is opened up at outer wall（3）, annular Mounting groove（3）The auxiliary piezoelectric patches of interior installation annular（5）, the auxiliary piezoelectric patches of annular（5）Upper surface auxiliary piezoelectric sealed acoustic impedance is set With layer（6）, circular trough（4）The interior circular main piezoelectric patches of installation（7）, circular main piezoelectric patches（7）Upper surface set master it is piezoelectric sealed Acoustic impedance matching layer（8）, the auxiliary piezoelectric patches of annular（5）Internal diameter be more than circular main piezoelectric patches（7）Diameter, circular main piezoelectric patches （7）With the auxiliary piezoelectric patches of annular（5）In vertical direction, fixed range, annular boss are set（14）Middle part opens up the first fairlead （10）, the first fairlead（10）The first wire of interior setting（13）, the first wire（13）Through shell（1）Positioned at shell（1）Outside, Shell（1）Under-filled adhesive layer（9）.
- A kind of 2. alliteration journey bimorph ultrasonic transducer according to claim 1, it is characterised in that：Annular boss （14）Upper edge be higher than shell（1）Upper edge, annular boss（14）Outer surface of upper is circular conical surface（12）.
- A kind of 3. alliteration journey bimorph ultrasonic transducer according to claim 2, it is characterised in that：The circular conical surface （12）Bottom and shell（1）Upper edge be generally aligned in the same plane in.
- A kind of 4. alliteration journey bimorph ultrasonic transducer according to claim 1, it is characterised in that：Annular mounting groove （3）Inside open up the second fairlead（11）, the second fairlead（11）The second wire of interior setting, second wire one end passes through adhesive layer （9）Positioned at shell（1）It is outside.
- A kind of 5. alliteration journey bimorph ultrasonic transducer according to claim 1, it is characterised in that：Circular main piezoelectricity Piece（7）Center line and the auxiliary piezoelectric patches of annular（5）Center line be same center line.
- A kind of 6. alliteration journey bimorph ultrasonic transducer according to claim 1, it is characterised in that：Master is piezoelectric sealed Acoustic impedance matching layer（8）Upper surface and auxiliary piezoelectric sealed acoustic impedance matching layer（6）Between fixed range is set.
- A kind of 7. alliteration journey bimorph ultrasonic transducer according to claim 1, it is characterised in that：Circular main piezoelectricity Piece（7）It is patty, the auxiliary piezoelectric patches of annular（5）It is ring cheese, circular main piezoelectric patches and the auxiliary piezoelectric patches parallel coaxial installation of annular.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016205936188 | 2016-06-17 | ||
| CN201620593618 | 2016-06-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206854039U true CN206854039U (en) | 2018-01-09 |
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ID=60815593
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720131551.0U Withdrawn - After Issue CN206854039U (en) | 2016-06-17 | 2017-02-14 | A kind of alliteration journey bimorph ultrasonic transducer |
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|---|---|
| CN (1) | CN206854039U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107051851A (en) * | 2016-06-17 | 2017-08-18 | 济南新盛电子科技有限公司 | A kind of alliteration journey bimorph ultrasonic transducer |
| CN111192565A (en) * | 2019-04-19 | 2020-05-22 | 尼尔森诺尔电气技术(天津)有限公司 | Sound wave reflector for fog whistle |
-
2017
- 2017-02-14 CN CN201720131551.0U patent/CN206854039U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107051851A (en) * | 2016-06-17 | 2017-08-18 | 济南新盛电子科技有限公司 | A kind of alliteration journey bimorph ultrasonic transducer |
| CN107051851B (en) * | 2016-06-17 | 2022-04-22 | 济南新盛电子科技有限公司 | Double-sound-path double-piezoelectric-plate ultrasonic transducer |
| CN111192565A (en) * | 2019-04-19 | 2020-05-22 | 尼尔森诺尔电气技术(天津)有限公司 | Sound wave reflector for fog whistle |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20220422 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20180109 Effective date of abandoning: 20220422 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |