CN107413611A - A kind of axial correlation type ultrasonic transducer for gas flow measurement - Google Patents
A kind of axial correlation type ultrasonic transducer for gas flow measurement Download PDFInfo
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- CN107413611A CN107413611A CN201710293530.3A CN201710293530A CN107413611A CN 107413611 A CN107413611 A CN 107413611A CN 201710293530 A CN201710293530 A CN 201710293530A CN 107413611 A CN107413611 A CN 107413611A
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- 238000005259 measurement Methods 0.000 title claims abstract description 40
- 238000007789 sealing Methods 0.000 claims abstract description 81
- 239000000919 ceramic Substances 0.000 claims abstract description 44
- 239000003292 glue Substances 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 28
- 230000005284 excitation Effects 0.000 claims abstract description 22
- 239000011230 binding agent Substances 0.000 claims description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 7
- 210000000234 capsid Anatomy 0.000 claims description 7
- 229910052709 silver Inorganic materials 0.000 claims description 7
- 239000004332 silver Substances 0.000 claims description 7
- 229920000742 Cotton Polymers 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 5
- 230000037431 insertion Effects 0.000 claims description 5
- 235000015110 jellies Nutrition 0.000 claims description 5
- 239000008274 jelly Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 5
- 241000276425 Xiphophorus maculatus Species 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000002463 transducing effect Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measuring Volume Flow (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of axial correlation type ultrasonic transducer for gas flow measurement.Including transducer housing,Acoustic impedance matching layer,Piezoelectric ceramic piece,Back lining materials,PCB adapter board,Sealing structure glue,Piezoelectric signal feeder line,Excitation/reception signal line,Transducer housing includes transducer kernel housing,The attachment structure portion for the tubular being co-axially located at outside transducer kernel housing forward end,It is arranged on airflow fence between transducer kernel housing and the inner tube wall in attachment structure portion,Acoustic impedance matching layer,Ultrasonic piezoelectric ceramic piece,Back lining materials,PCB adapter board is sequentially arranged at the interior intracavitary of transducer kernel housing and by sealing structure glue sealing from front to back,Welded with piezoelectric ceramic piece piezoelectric signal feeder line one end,The other end is welded in PCB adapter board and is brought out,Excitation/reception signal wire bonding is in PCB adapter board,The gas channel for balanced inner and outer air pressure is left between the inner chamber of transducer kernel housing and transducer kernel hull outside.The present invention is stable and reliable for performance.
Description
Technical field
The present invention relates to a kind of axial correlation type ultrasonic transducer for gas flow measurement, belong to transducer technology
Field.
Background technology
One of Primary Component is gas Jie's ultrasonic transducer in ultrasonic gas flow measurement device.It is of the prior art
Gas Jie's ultrasonic transducer product is still immature, the defects of properties of product are unstable, measurement accuracy is low, service life is short be present.
The content of the invention
For drawbacks described above present in prior art, the invention provides it is a kind of it is stable and reliable for performance, measurement accuracy is high,
Long, the easy for installation axial correlation type ultrasonic transducer for gas flow measurement of service life.
The present invention is achieved by the following technical solution：A kind of axial correlation ultrasound for gas flow measurement
Wave transducer, it is characterized in that：Including transducer housing, acoustic impedance matching layer, ultrasonic piezoelectric ceramic piece, back lining materials, PCB switchings
Plate, sealing structure glue, two piezoelectric signal feeder lines, excitation/reception signal line, the transducer housing include transducer inner capsid
Body, the columnar attachment structure that can be connected with measurement pipeline section being co-axially located at outside the transducer kernel housing forward end
Portion, be axially disposed within along the transducer kernel housing transducer kernel housing and the attachment structure portion inner tube wall it
Between multiple airflow fences, the airflow fence and the transducer kernel housing, the attachment structure portion inner tube wall between formed
Multiple flow-guiding channels, the barrel outer surface in the attachment structure portion carries the sealing structure being used for measuring segment seal, described
Acoustic impedance matching layer, ultrasonic piezoelectric ceramic piece, back lining materials, PCB adapter board are sequentially arranged in the transducer from front to back
The interior intracavitary of nucleocapsid and by the sealing structure glue sealing, between the acoustic impedance matching layer and the ultrasonic piezoelectric ceramic piece
It is bonded together by binding agent, leaves and be used between the inner chamber of the transducer kernel housing and transducer kernel hull outside
The gas channel of balanced inner and outer air pressure, described two equal one end of piezoelectric signal feeder line are corresponding with the ultrasonic piezoelectric ceramic piece
Side silver electrode welding, its other end are welded in the respective pad of the PCB adapter board and gone out to the transducer kernel
Hull outside, piezoelectric signal feeder line described in two feed signal between ultrasonic piezoelectric ceramic piece and PCB adapter board are described to swash
Encourage/one end of reception signal line is welded on the relevant position of the PCB adapter board, its other end is led in the transducer
Outside nucleocapsid.
The present invention in use, when load gas be situated between measurement pipeline after, transducer kernel hull outside setting attachment structure portion
It can be positioned and it is sealed between measurement pipeline, ensure that the axis of upstream transducer and downstream transducer is aligned simultaneously
Flow leakage is prevented, there is good stability.The gas channel set in the present invention, it is outside ultrasonic transducer and internal
Between provide gas channel, can balanced inner and outer air pressure, be balanced each member compression of its gas Jie's ultrasonic transducer, to obtain
Obtain its high-performance and long-life.Acoustic impedance matching layer, ultrasonic piezoelectric ceramic piece, back lining materials, PCB adapter board, piezoelectric signal feedback
Line, excitation/reception signal line composition transducer kernel, ultrasonic piezoelectric ceramic piece is used for piezoelectricity conversion to be changed with inverse piezoelectricity, acoustic resistance
The impedance matching that anti-matching layer is used between gas medium is transmitted with acoustic energy, and two piezoelectric signal feeder lines are ultrasonic piezoelectric ceramics
Feed signal between piece and PCB adapter board, excitation/reception signal line are used for the signal excitation of transducer and external circuit or connect
Receive.Water conservancy diversion can be carried out by the air-flow measured in pipeline by being arranged on the airflow fence of transducer kernel hull outside, can effectively reduce survey
Air-flow inhomogeneities caused by transducer body, is improved its measurement accuracy in buret road.
For ease of cabling, the transducer housing is provided with cable hole.
In order to ensure that PCB adapter board fixes reliable and guarantee sealing, the periphery of the PCB adapter board is provided with L-type section
Elastic seal ring.
Further, there is good positioning and sealing after gas Jie's measurement pipeline is loaded for guarantee ultrasonic transducer
Property, the sealing structure for being arranged on the barrel outer surface in attachment structure portion is at least one concave convex groove structure, the tongue and groove knot
O-ring seals are provided with structure.
Further, the back lining materials are sound absorption cotton or elastic jelly.
It is preferred that the piezoelectric signal feeder line is the thinner multiply RVV or sub-thread bare wire or sub-thread RVV of diameter；Two
Piezoelectric signal feeder line described in root is welded in the silver electrode surface of the piezoelectric ceramic piece respective side with Central Symmetry.
In the present invention, the installation and positioning of acoustic impedance matching layer can take various forms, and it can use forward location side
Formula, when using this kind of positioning method, the inner chamber of the transducer kernel housing in the present invention is included directly successively from front to back
The acoustic impedance matching layer forward location that footpath is d and protection section, cylindrical cavity section A of the diameter more than d, diameter are empty more than the cylinder
The PCB of chamber section A diameters is fixed and sealing structure glue sealing section A, the acoustic impedance matching layer forward location with protection section with it is described
Cylindrical cavity section A forms circular platform A, circumferentially spaced in the cavity wall of the cylindrical cavity section A to be provided with multiple boss,
Multiple gap A are formed between adjacent boss, multiple rear ends by the circular platform A are provided with the circular platform A
Face penetrates to the through hole outside the circular platform A or groove A, the acoustic impedance matching layer and is arranged on the cylindrical cavity section
In A, described through hole or groove A are connected with the gap A formed by the boss and are formed described gas channel.Tied using this kind
Structure, acoustic impedance matching layer carry out axially position by circular platform A, are carried out radially by the boss in cylindrical cavity section A cavity wall
Positioning.Through hole or groove A connect with the gap A formed by boss forms gas channel, can balanced inner and outer air pressure.This kind of structure
Transducer, its kernel can integrally load transducer kernel in transducer inner capsid body from rear end.
Preferably, to ensure reliability, the outer openings of through hole or the groove A are located at the circular platform A's
Inner periphery side.
Further, circumference of the boss along the cylindrical cavity section A is uniformly distributed, and through hole or the groove A is corresponding
In the gap distribution that the boss is formed.
The installation and positioning of acoustic impedance matching layer in the present invention can also use backward positioning method, i.e. the transducer
The inner chamber of kernel housing includes acoustic impedance matching layer positioning section, a diameter of d cylindrical cavity that diameter is more than d successively from front to back
Section B, PCB of the diameter more than or equal to d are fixed and sealing structure glue sealing section B, the cylindrical cavity section B cavity wall are provided with multiple
Penetrate its axial groove, the embedded acoustic impedance for being fixedly mounted on the transducer kernel housing of the acoustic impedance matching layer
With on layer positioning section, left between the cavity wall of the outer circumference surface of the acoustic impedance matching layer and the acoustic impedance matching layer positioning section
Gap B, gap B are connected to form described gas channel with the groove in the cavity wall of the cylindrical cavity section B.Using this kind
Structure, acoustic impedance matching layer are carried out axially by the platform end face formed between acoustic impedance matching layer positioning section and cylindrical cavity section B
Positioning.Gap B is connected the gas channel to be formed with the groove in cylindrical cavity section B cavity wall, can balanced inner and outer air pressure.This kind
The transducer of structure, by front loaded, PCB turns for acoustic impedance matching layer and transducer kernel in addition to PCB adapter board during assembling
Fishplate bar is loaded in transducer inner capsid body by rear end.
When the installation and positioning of acoustic impedance matching layer in the present invention are using backward positioning method, it can also use following knot
Structure：The inner chamber of the transducer kernel housing includes acoustic impedance matching layer positioning section, the diameter that diameter is more than d successively from front to back
Fixed for the PCB of d cylindrical cavity section B, diameter more than or equal to d and sealing structure glue sealing section B, the acoustic impedance matching layer are embedding
Enter formula to be fixedly mounted on the acoustic impedance matching layer positioning section of the transducer kernel housing, the acoustic impedance matching layer it is cylindrical
Gap B is left between the cavity wall of side face and the acoustic impedance matching layer positioning section, in the front end of the cylindrical cavity section B along its chamber
Wall is circumferentially provided with multiple through hole or groove B and connected with the gap B, and the gap B forms described with described through hole or groove B
Gas channel.Gap B is connected to form gas channel with the through hole in cylindrical cavity section B front end cavity wall or groove B, can be equal
Weigh inner and outer air pressure.The transducer of this kind of structure, during assembling acoustic impedance matching layer and transducer kernel in addition to PCB adapter board by
Front loaded, PCB adapter board is loaded in transducer inner capsid body by rear end.
The beneficial effects of the invention are as follows：Structure design of the present invention is unique, and it had both included the ultrasonic wave transducer for measurement
Device part, gas flow guiding grid structure, also include the attachment structure portion that can be connected with measurement pipeline section, being integrally formed of three parts
Structure, it is convenient to measuring pipeline joint, form ultrasonic wave axial direction correlation gas flow measuring tube road, while unique knot
Structure design can make each part of transducer easy for installation, and and can ensures that each part has good polarization；The setting of airflow fence
Air-flow inhomogeneities caused by transducer body in measurement pipeline can be effectively reduced, is improved its measurement accuracy；It connects
Connecing the sealing structure of structural portion outer surface setting can make it have good positioning and sealing after loading gas flow measuring tube road
Property, to ensure that the axis of upstream transducer and downstream transducer is aligned, and there is good stability.The present invention is by setting gas
Circulation road, to be situated between measurement pipeline with gas and providing gas channel inside ultrasonic transducer, can balanced inner and outer air pressure, make to surpass
Each member compression of acoustic wave transducer is balanced, and can obtain high-performance and long-life.
Brief description of the drawings
Fig. 1 is front view of the invention in embodiment 1；
Fig. 2 is Fig. 1 left view；
Fig. 3 is the A-A sectional views in Fig. 1；
Fig. 4 is the B-B sectional views in Fig. 2；
Fig. 5 is dimensional structure diagram of the invention in embodiment 1；
Fig. 6 is front view of the invention in embodiment 2；
Fig. 7 is Fig. 6 left view；
Fig. 8 is the C-C sectional views in Fig. 6；
Fig. 9 is the D-D sectional views in Fig. 7；
Figure 10 is front view of the invention in embodiment 3；
Figure 11 is Figure 10 left view；
Figure 12 is the E-E sectional views in Figure 10；
Figure 13 is the F-F sectional views in Figure 10；
In figure, 1, acoustic impedance matching layer, 2, binding agent, 3, ultrasonic piezoelectric ceramic piece, 4, back lining materials, 5, PCB adapter board,
6th, piezoelectric signal feeder line, 7, excitation/reception signal line, 8, L-type cross-section elasticities sealing ring, 9, sealing structure glue, 10, in transducer
Nucleocapsid, 101, acoustic impedance matching layer forward location and protection section, 102, cylindrical cavity section A, 103, PCB is fixed and sealing structure
Glue sealing section A, 104, circular platform A, 11, attachment structure portion, 105, acoustic impedance matching layer positioning section, 106, cylindrical cavity section
B, 107, PCB is fixed and sealing structure glue sealing section B, 110, concave convex groove structure, 12, airflow fence, 13, through hole or groove A, 14, O
Shape sealing ring, 15, cable hole, 16, boss, 17, gap A, 18, gap B, 19, groove, 20, rib, 21, through hole or groove B, 22,
Flow-guiding channel.
Embodiment
Below by non-limiting embodiment and with reference to accompanying drawing, the present invention is further illustrated：
Embodiment 1
As Figure 1-Figure 5, a kind of axial correlation type ultrasonic transducer for gas flow measurement, it includes transducing
9, two device housing, acoustic impedance matching layer 1, ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5, sealing structure glue pressures
Electric signal feeder line 6, excitation/reception signal line 7.The transducer housing includes transducer kernel housing 10, is co-axially located at institute
State the columnar attachment structure portion 11 that can be connected with measurement pipeline section outside the front end of transducer kernel housing 10, along the transducing
Device kernel housing 10 is axially disposed within more between the transducer kernel housing 10 and the inner tube wall in the attachment structure portion 11
Individual airflow fence 12, the airflow fence 12 and the transducer kernel housing 10, the attachment structure portion 11 inner tube wall between connect
Connect to form multiple flow-guiding channels 22, in the present embodiment, airflow fence 12 is platy structure, external along transducer inner capsid provided with 3 pieces
Surface is evenly arranged.The barrel outer surface in the attachment structure portion 11 carries the sealing structure being used for measuring segment seal, this
The sealing structure in embodiment is two axially disposed concave convex groove structures 110, and O is provided with each concave convex groove structure
Shape sealing ring 14, for being sealed with measurement pipeline.According to actual conditions, above-mentioned sealing structure can also only include one
Concave convex groove structure 110.The transducer kernel housing 10 is metal or plastic material, there is the front and rear cavity of insertion inside it.Institute
State the inner chamber of transducer kernel housing 10 includes a diameter of d acoustic impedance matching layer forward location and protection section successively from front to back
101st, knot is fixed and sealed to cylindrical cavity section A102 of the diameter more than d, diameter more than the PCB of the cylindrical cavity section A102 diameters
Structure glue sealing section A103, the acoustic impedance matching layer forward location form circle with protection section 101 with the cylindrical cavity section A102
Ring-shaped platform A104, circumferentially spaced in the cavity wall of the cylindrical cavity section A102 to be provided with multiple boss 16, adjacent is convex
Multiple gap A17 are formed between platform 16, be provided with the circular platform A104 it is multiple by the circular platform A104 after
End face is penetrated to the through hole or groove A13 outside the circular platform A104.The acoustic impedance matching layer 1 is arranged on the circle
In post cavity segment A102, the ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5 are from front to back successively by acoustic impedance
With the rear side of layer 1 be arranged on the transducer kernel housing 10 PCB fix and sealing structure glue sealing section A103 cavity in simultaneously
By the sealing of sealing structure glue 9.It is viscous by binding agent 2 between the acoustic impedance matching layer 1 and the ultrasonic piezoelectric ceramic piece 3
Together, the ultrasonic piezoelectric ceramic piece 3 is circular or rectangle to knot, and binding agent energy 2 makes pottery acoustic impedance matching layer 1 and ultrasonic piezoelectricity
Ceramics 3 was effectively bonded together, and its compatibility is good, and is adapted to -25 DEG C -+55 DEG C of working environment, not less than 10 years
Service life.In order to ensure that PCB adapter board 5 fixes reliable and guarantee sealing and protection PCB adapter board, the PCB adapter board 5
Periphery be provided with L-type cross-section elasticities sealing ring 8.For balanced transducer housing inner and outer air pressure, the present invention is in transducer kernel housing
Leave the gas channel for balanced inner and outer air pressure between 10 inner chamber and the outside of transducer kernel housing 10, in the present embodiment,
Described through hole or groove A13 connects with the gap A17 formed by the boss 16 forms the gas channel.Two piezoelectric signals
One end of feeder line 6 is respectively welded on the Central Symmetry position of two silver electrode surfaces of the both sides of ultrasonic piezoelectric ceramic piece 3,
Its other end is respectively welded in the respective pad of the PCB adapter board 5 and is drawn to outside the transducer kernel housing 10
Portion, piezoelectric signal feeder line 6 described in two feed signal between ultrasonic piezoelectric ceramic piece and PCB adapter board.Piezoelectric signal is presented
Line 6 is preferably the thinner multiply RVV or sub-thread bare wire or sub-thread RVV of diameter.The one of the excitation/reception signal line 7
End is welded on the relevant position of the PCB adapter board 5, and its other end is led to outside the transducer kernel housing 10, institute
It can be single shielded signal line or coaxial cable or two-conductor line to state excitation/reception signal line 7.The ultrasonic piezoelectric ceramic piece 3
The back lining materials 4 placed backward can be that sound absorption cotton or elastic jelly, the backward of back lining materials can be carried out PCB adapter board 5
Positioning.For ease of cabling, cable hole 15 is additionally provided with the transducer housing.
In the present invention, acoustic impedance matching layer 1, ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5, piezoelectric signal
Feeder line 6, excitation/reception signal line 7 form transducer kernel.When the present invention is assembled, the transducer kernel portion that will assemble
Divide and load and position from the rear end of transducer kernel housing, finally with the sealing of sealing structure glue 9.
In the present embodiment, it is preferred that the outer openings of through hole or the groove A13 are located at the circular platform A104
Inner periphery side, circumference of the boss 16 along the cylindrical cavity section A102 be uniformly distributed, through hole or the groove A13
The gap distribution formed corresponding to the boss 16.
Other parts in the present embodiment are prior art, be will not be repeated here.
Embodiment 2
As shown in accompanying drawing 6- Fig. 9, a kind of axial correlation type ultrasonic transducer for gas flow measurement, it includes changing
Can device housing, acoustic impedance matching layer 1, ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5, sealing structure glue 9, two
Piezoelectric signal feeder line 6, excitation/reception signal line 7.The transducer housing includes transducer kernel housing 10, is co-axially located at
The columnar attachment structure portion 11 that can be connected with measurement pipeline section outside the front end of transducer kernel housing 10, change along described
Energy device kernel housing 10 is axially disposed between the transducer kernel housing 10 and the inner tube wall in the attachment structure portion 11
Multiple airflow fences 12, the airflow fence 12 and the transducer kernel housing 10, the attachment structure portion 11 inner tube wall between
Connect and form multiple flow-guiding channels 22, in the present embodiment, airflow fence 12 is platy structure, provided with 3 pieces, along transducer kernel housing
Outer surface is evenly arranged.The barrel outer surface in the attachment structure portion 11 carries the sealing structure being used for measuring segment seal,
The sealing structure in the present embodiment is two axially disposed concave convex groove structures 110, is set in each concave convex groove structure
There are O-ring seals 14, for being sealed with measurement pipeline.According to actual conditions, above-mentioned sealing structure can also only include
One concave convex groove structure 110.The transducer kernel housing 10 is metal or plastic material, there is the front and rear sky of insertion inside it
Chamber.The inner chamber of the transducer kernel housing 10 includes the acoustic impedance matching layer positioning section that diameter is more than d successively from front to back
105th, the PCB of a diameter of d cylindrical cavity section B106, diameter more than or equal to d is fixed and sealing structure glue sealing section B107, described
Cylindrical cavity section B106 cavity wall is provided with multiple its axial groove 19 of insertion, is formed as rib between adjacent two grooves 19
20.The embedded acoustic impedance matching layer positioning section for being fixedly mounted on the transducer kernel housing 10 of the acoustic impedance matching layer 1
On 105, the ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5 are from front to back successively by the rear side of acoustic impedance matching layer 1
Installed in the PCB of the transducer kernel housing 10 fix and sealing structure glue sealing section B107 cavity in and by the sealing
The sealing of structure glue 9.Wherein, glue laminating is applied between the rear end face of acoustic impedance matching layer 1 and cylindrical cavity section B106 front end face to consolidate
It is scheduled on together, is bonded together between acoustic impedance matching layer 1 and ultrasonic piezoelectric ceramic piece 3 by binding agent 2, the ultrasonic piezoelectricity
Potsherd 3 is circular or rectangle, and acoustic impedance matching layer 1 and ultrasonic piezoelectric ceramic piece 3 are effectively bonded in one by binding agent energy 2
Rise, its compatibility is good, and is adapted to -25 DEG C -+55 DEG C of working environment, the service life not less than 10 years.In order to ensure PCB
Pinboard 5 is fixed reliable and ensures sealing and protection PCB adapter board, and the periphery of the PCB adapter board 5 is provided with L-type section bullet
Property sealing ring 8.Stayed between the cavity wall of the outer circumference surface of the acoustic impedance matching layer 1 and the acoustic impedance matching layer positioning section 105
There is gap B18, gap B18 is connected to form gas channel with the groove 19 in the cavity wall of the cylindrical cavity section B106, should
Gas channel is used for balanced transducer inner and outer air pressure.One end of two piezoelectric signal feeder lines 6 is respectively welded at the ultrasonic piezoelectricity
On the Central Symmetry position of two silver electrode surfaces of the both sides of potsherd 3, its other end is respectively welded at the PCB adapter board 5
Respective pad on and be drawn to outside the transducer kernel housing 10, the piezoelectric signal feeder line 6 described in two for ultrasound
Feed signal between piezoelectric ceramic piece and PCB adapter board.Piezoelectric signal feeder line 6 is preferably the thinner multiply RVV or list of diameter
Stock bare wire or sub-thread RVV.One end of the excitation/reception signal line 7 is welded on the relevant position of the PCB adapter board 5
On, its other end is led to outside the transducer kernel housing 10, and the excitation/reception signal line 7 can be that single shields
Signal wire or coaxial cable or two-conductor line.After back lining materials 4 from the ultrasonic piezoelectric ceramic piece 3 to placement can be sound absorption cotton or
Elastic jelly, the backward of back lining materials can be positioned PCB adapter board 5.For ease of cabling, on the transducer housing also
Provided with cable hole 15.
In the present invention, acoustic impedance matching layer 1, ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5, piezoelectric signal
Feeder line 6, excitation/reception signal line 7 form transducer kernel.When the present invention is assembled, first by acoustic impedance matching layer 1 and remove
Transducer kernel outside PCB adapter board is by its front loaded cavity of transducer kernel housing, acoustic impedance matching layer 1 is by cylinder
Cavity segment B106 front end face positioning, applies glue between the rear end face of acoustic impedance matching layer 1 and cylindrical cavity section B106 front end face
Fitting, then PCB adapter board is loaded by the rear end of transducer kernel housing, and weld upper piezoelectric signal feeder line, excitation/reception
Signal wire 7；Then, L-type cross-section elasticities sealing ring 8 is covered on PCB adapter board periphery or takes corresponding seal approach；Finally, use
The sealing of sealing structure glue 9.
Other parts in the present embodiment are prior art, be will not be repeated here.
Embodiment 3
As shown in accompanying drawing 10- Figure 13, a kind of axial correlation type ultrasonic transducer for gas flow measurement, it includes
Transducer housing, acoustic impedance matching layer 1, ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5, sealing structure glue 9, two
Root piezoelectric signal feeder line 6, excitation/reception signal line 7.The transducer housing includes transducer kernel housing 10, is coaxially disposed
The columnar attachment structure portion 11 that can be connected with measurement pipeline section outside the front end of transducer kernel housing 10, along described
Transducer kernel housing 10 is axially disposed between the transducer kernel housing 10 and the inner tube wall in the attachment structure portion 11
Multiple airflow fences 12, the airflow fence 12 and the transducer kernel housing 10, the attachment structure portion 11 inner tube wall it
Between connection form multiple flow-guiding channels 22, in the present embodiment, airflow fence 12 is platy structure, provided with 3 pieces, along transducer inner capsid
External surface is evenly arranged.The barrel outer surface in the attachment structure portion 11 carries the sealing knot being used for measuring segment seal
Structure, the sealing structure in the present embodiment is two axially disposed concave convex groove structures 110, in each concave convex groove structure
Provided with O-ring seals 14, for being sealed with measurement pipeline.According to actual conditions, above-mentioned sealing structure can also be wrapped only
Include a concave convex groove structure 110.The transducer kernel housing 10 is metal or plastic material, there is the front and rear sky of insertion inside it
Chamber.The inner chamber of the transducer kernel housing 10 includes the acoustic impedance matching layer positioning section that diameter is more than d successively from front to back
105th, the PCB of a diameter of d cylindrical cavity section B106, diameter more than or equal to d is fixed and sealing structure glue sealing section B107.It is described
Acoustic impedance matching layer 1 is embedded to be fixedly mounted on the acoustic impedance matching layer positioning section 105 of the transducer kernel housing 10, institute
State ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5 and institute is arranged on by the rear side of acoustic impedance matching layer 1 successively from front to back
State transducer kernel housing 10 PCB fix and sealing structure glue sealing section B107 cavity in and by the sealing structure glue 9
Sealing.Wherein, glue laminating is applied between the rear end face of acoustic impedance matching layer 1 and cylindrical cavity section B106 front end face and is fixed on one
Rise, be bonded together between acoustic impedance matching layer 1 and ultrasonic piezoelectric ceramic piece 3 by binding agent 2, the ultrasonic piezoelectric ceramic piece
3 be circular or rectangle, and acoustic impedance matching layer 1 and ultrasonic piezoelectric ceramic piece 3 are effectively bonded together by binding agent energy 2, its parent
It is good with property, and it is adapted to -25 DEG C -+55 DEG C of working environment, the service life not less than 10 years.In order to ensure PCB adapter board 5
Fixed reliable and guarantee sealing and protection PCB adapter board, the periphery of the PCB adapter board 5 is provided with L-type cross-section elasticities sealing ring
8.Gap is left between the cavity wall of the outer circumference surface of the acoustic impedance matching layer 1 and the acoustic impedance matching layer positioning section 105
B18, multiple through hole or groove B18 and the gap B18 are circumferentially provided with along its cavity wall in the front end of the cylindrical cavity section B102
Connection, the gap B18 form gas channel with described through hole or groove B21, and the gas channel is used in balanced transducer
Outer air pressure.One end of two piezoelectric signal feeder lines 6 is respectively welded at two silver electrode tables of the both sides of ultrasonic piezoelectric ceramic piece 3
On the Central Symmetry position in face, its other end is respectively welded in the respective pad of the PCB adapter board 5 and is drawn to described
Outside transducer kernel housing 10, the piezoelectric signal feeder line 6 described in two is presented between ultrasonic piezoelectric ceramic piece and PCB adapter board
The number of delivering letters.Piezoelectric signal feeder line 6 is preferably the thinner multiply RVV or sub-thread bare wire or sub-thread RVV of diameter.It is described to swash
Encourage/one end of reception signal line 7 is welded on the relevant position of the PCB adapter board 5, its other end leads to the transducer
Outside kernel housing 10, the excitation/reception signal line 7 can be single shielded signal line or coaxial cable or two-conductor line.Institute
It is sound absorption cotton or elastic jelly to state after ultrasonic piezoelectric ceramic piece 3 to the back lining materials 4 of placement, and the backward of back lining materials can
PCB adapter board 5 is positioned.For ease of cabling, cable hole 15 is additionally provided with the transducer housing.
In the present invention, acoustic impedance matching layer 1, ultrasonic piezoelectric ceramic piece 3, back lining materials 4, PCB adapter board 5, piezoelectric signal
Feeder line 6, excitation/reception signal line 7 form transducer kernel.When the present invention is assembled, first by acoustic impedance matching layer 1 and remove
Transducer kernel outside PCB adapter board is by its front loaded cavity of transducer kernel housing, acoustic impedance matching layer 1 is by cylinder
Cavity segment B106 front end face positioning, applies glue between the rear end face of acoustic impedance matching layer 1 and cylindrical cavity section B106 front end face
Fitting, then PCB adapter board is loaded by the rear end of transducer kernel housing, and weld upper piezoelectric signal feeder line, excitation/reception
Signal wire 7；Then, L-type cross-section elasticities sealing ring 8 is covered on PCB adapter board periphery or takes corresponding seal approach；Finally, use
The sealing of sealing structure glue 9.
Other parts in the present embodiment are prior art, be will not be repeated here.
Claims (11)
1. a kind of axial correlation type ultrasonic transducer for gas flow measurement, it is characterized in that：Including transducer housing, sound
Impedance matching layer (1), ultrasonic piezoelectric ceramic piece (3), back lining materials (4), PCB adapter board (5), sealing structure glue (9), two pressures
Electric signal feeder line (6), excitation/reception signal line (7), the transducer housing include transducer kernel housing (10), coaxially set
Put outside transducer kernel housing (10) front end can with measurement pipeline section be connected columnar attachment structure portion (11),
It is axially disposed within the transducer kernel housing (10) and the attachment structure portion (11) along the transducer kernel housing (10)
Inner tube wall between multiple airflow fences (12), the airflow fence (12) and the transducer kernel housing (10), the connection
Multiple flow-guiding channels are formed between the inner tube wall of structural portion (11), the barrel outer surface of the attachment structure portion (11), which carries, to be used for
With measure segment seal sealing structure, the acoustic impedance matching layer (1), ultrasonic piezoelectric ceramic piece (3), back lining materials (4),
PCB adapter board (5) is sequentially arranged at the interior intracavitary of the transducer kernel housing (10) and by the sealing structure from front to back
Glue (9) sealing, it is bonded together between the acoustic impedance matching layer (1) and the ultrasonic piezoelectric ceramic piece (3) by binding agent,
Left between the inner chamber of the transducer kernel housing (10) and transducer kernel housing (10) outside for balanced inner and outer air pressure
Gas channel, described two piezoelectric signal feeder lines (6) one end and the respective side silver electricity of the ultrasonic piezoelectric ceramic piece (3)
Pole is welded, and its other end is welded in the respective pad of the PCB adapter board (5) and is drawn to the transducer inner capsid
Body (10) is outside, the feed signal between ultrasonic piezoelectric ceramic piece and PCB adapter board of the piezoelectric signal feeder line (6) described in two,
One end of the excitation/reception signal line (7) is welded on the relevant position of the PCB adapter board (5), and its other end is led to
The transducer kernel housing (10) is outside.
2. the axial correlation type ultrasonic transducer according to claim 1 for gas flow measurement, it is characterized in that：Institute
State transducer housing and be provided with cable hole (15).
3. the axial correlation type ultrasonic transducer according to claim 1 for gas flow measurement, it is characterized in that：Institute
The periphery for stating PCB adapter board (5) is provided with L-type cross-section elasticities sealing ring (8).
4. the axial correlation type ultrasonic transducer according to claim 1 for gas flow measurement, it is characterized in that：If
It is at least one concave convex groove structure to put the sealing structure in the barrel outer surface of attachment structure portion (11), the concave convex groove structure
It is interior to be provided with O-ring seals.
5. the axial correlation type ultrasonic transducer according to claim 1 for gas flow measurement, it is characterized in that：Institute
Back lining materials (4) are stated as sound absorption cotton or elastic jelly.
6. the axial correlation type ultrasonic transducer according to claim 1 for gas flow measurement, it is characterized in that：Institute
Piezoelectric signal feeder line (6) is stated as diameter thinner multiply RVV or sub-thread bare wire or sub-thread RVV；Piezoelectricity described in two
Signal feed (6) is welded in the silver electrode surface of the piezoelectric ceramic piece (3) respective side with Central Symmetry.
7. the axial correlation type ultrasonic for gas flow measurement according to claim 1 or 2 or 3 or 4 or 5 or 6 changes
Energy device, it is characterized in that：The inner chamber of the transducer kernel housing (10) includes a diameter of d acoustic impedance match successively from front to back
Layer forward location is more than the cylindrical cavity section A with cylindrical cavity section A (102), the diameter of protection section (101), diameter more than d
(102) PCB of diameter is fixed and sealing structure glue sealing section A (103), the acoustic impedance matching layer forward location and protection section
(101) circular platform A (104) is formed with the cylindrical cavity section A (102), in the cavity wall of the cylindrical cavity section A (102)
It is circumferentially spaced to be provided with multiple boss (16), multiple gap A (17) are formed between adjacent boss (16), in the annular
Multiple rear end faces by the circular platform A (104) are provided with platform A (104) to penetrate to the circular platform A (104)
Outside through hole or groove A (13), the acoustic impedance matching layer (1) is arranged in the cylindrical cavity section A (102), described
Through hole or groove A (13) connect with the gap A formed by the boss (16) forms described gas channel.
8. the axial correlation type ultrasonic transducer according to claim 7 for gas flow measurement, it is characterized in that：Institute
The outer openings for stating through hole or groove A (13) are located at the inner periphery side of the circular platform A (104).
9. the axial correlation type ultrasonic transducer according to claim 7 for gas flow measurement, it is characterized in that：Institute
State circumference of the boss (16) along the cylindrical cavity section A (102) to be uniformly distributed, through hole or the groove A (13) corresponds to described
The gap distribution that boss (16) is formed.
10. the axial correlation type ultrasonic for gas flow measurement according to claim 1 or 2 or 3 or 4 or 5 or 6 changes
Energy device, it is characterized in that：The inner chamber of the transducer kernel housing (10) includes the acoustic impedance that diameter is more than d successively from front to back
PCB with layer positioning section (105), a diameter of d cylindrical cavity section B (106), diameter more than or equal to d is fixed and sealing structure glue
Sealing section B (107), the cavity wall of the cylindrical cavity section B (106) are provided with multiple its axial groove (19) of insertion, the sound
The embedded acoustic impedance matching layer positioning section (105) for being fixedly mounted on the transducer kernel housing (10) of impedance matching layer (1)
On, between being left between the outer circumference surface of the acoustic impedance matching layer (1) and the cavity wall of the acoustic impedance matching layer positioning section (105)
Gap B (18), gap B (18) are connected to form described gas with the groove (19) in the cavity wall of the cylindrical cavity section B (106)
Circulation road.
11. the axial correlation type ultrasonic for gas flow measurement according to claim 1 or 2 or 3 or 4 or 5 or 6 changes
Energy device, it is characterized in that：The inner chamber of the transducer kernel housing (10) includes the acoustic impedance that diameter is more than d successively from front to back
PCB with layer positioning section (105), a diameter of d cylindrical cavity section B (106), diameter more than or equal to d is fixed and sealing structure glue
Sealing section B (107), the embedded acoustic resistance for being fixedly mounted on the transducer kernel housing (10) of the acoustic impedance matching layer (1)
On anti-matching layer positioning section (105), outer circumference surface and the acoustic impedance matching layer positioning section of the acoustic impedance matching layer (1)
(105) gap B (18) is left between cavity wall, is circumferentially provided with along its cavity wall in the front end of the cylindrical cavity section B (102) multiple
Through hole or groove B (18) connect with the gap B (18), and the gap B (18) forms institute with described through hole or groove B (21)
The gas channel stated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293530.3A CN107413611A (en) | 2017-04-28 | 2017-04-28 | A kind of axial correlation type ultrasonic transducer for gas flow measurement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710293530.3A CN107413611A (en) | 2017-04-28 | 2017-04-28 | A kind of axial correlation type ultrasonic transducer for gas flow measurement |
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| CN107413611A true CN107413611A (en) | 2017-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710293530.3A Withdrawn CN107413611A (en) | 2017-04-28 | 2017-04-28 | A kind of axial correlation type ultrasonic transducer for gas flow measurement |
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| CN (1) | CN107413611A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109013257A (en) * | 2018-08-13 | 2018-12-18 | 苏州斯威高科信息技术有限公司 | A kind of ultrasonic transducer |
| CN111900520A (en) * | 2020-06-09 | 2020-11-06 | 中国电子科技集团公司第十三研究所 | Silicon-based micro-coaxial delay line chip |
-
2017
- 2017-04-28 CN CN201710293530.3A patent/CN107413611A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109013257A (en) * | 2018-08-13 | 2018-12-18 | 苏州斯威高科信息技术有限公司 | A kind of ultrasonic transducer |
| CN109013257B (en) * | 2018-08-13 | 2024-04-30 | 苏州斯威高科信息技术有限公司 | Ultrasonic transducer |
| CN111900520A (en) * | 2020-06-09 | 2020-11-06 | 中国电子科技集团公司第十三研究所 | Silicon-based micro-coaxial delay line chip |
| CN111900520B (en) * | 2020-06-09 | 2021-08-31 | 中国电子科技集团公司第十三研究所 | Silicon-based micro-coaxial delay line chip |
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