CN106525181B - Double-shell ultrasonic transducer with temperature compensation gas - Google Patents
Double-shell ultrasonic transducer with temperature compensation gas Download PDFInfo
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- CN106525181B CN106525181B CN201611214899.2A CN201611214899A CN106525181B CN 106525181 B CN106525181 B CN 106525181B CN 201611214899 A CN201611214899 A CN 201611214899A CN 106525181 B CN106525181 B CN 106525181B
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- shell
- piezoelectric ceramic
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- ultrasonic transducer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/02—Compensating or correcting for variations in pressure, density or temperature
- G01F15/04—Compensating or correcting for variations in pressure, density or temperature of gases to be measured
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- 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
- G01F1/662—Constructional details
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Measuring Volume Flow (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
A double-shell ultrasonic transducer with gas supply and temperature, comprising: the invention mainly adopts the double shells to solve the problem that the working condition interference does not directly act on the inner shell of the main body of the gas ultrasonic transducer, thereby bringing the advantages of minimal influence on the transducer caused by the working condition interference such as strong change and vibration and improving the stability. The change of the mode of fixing the piezoelectric ceramics ensures that the piezoelectric ceramics are in a free state, and under the same voltage, the longitudinal vibration output power is large, the sensitivity is improved, and the output waveform quality is improved. After the double shells are adopted, gas close to the sound velocity can be injected to serve as a matching layer according to different gas working conditions, sound wave refraction is reduced, and sound wave emission efficiency is improved. The design of the hard center plane film solves the sealing problem of the double shells, solves the pressure resistance problem of the transducer, reduces the influence of working condition change on the inner shell, and improves the sensitivity and the reliability.
Description
Technical Field
The invention relates to the technology in the field of ultrasonic detection, in particular to a double-shell ultrasonic transducer with a temperature-compensated gas.
Background
When an electric field is applied in the polarization direction of the piezoelectric ceramic, the piezoelectric ceramic will generate mechanical deformation or mechanical stress in a certain direction. When the external electric field is removed, the deformation or stress disappears. This physical phenomenon is called the inverse piezoelectric effect. The ultrasonic generator can be manufactured by utilizing the inverse piezoelectric effect. The gas ultrasonic transducer and the liquid ultrasonic transducer can be manufactured through certain structural forms. The gas ultrasonic transducer used for measuring the flow of the gas medium is particularly sensitive to the change of state parameters such as temperature, pressure intensity and flow velocity of fluid, and can cause corresponding sound velocity change, thereby influencing the measurement precision.
After the gas ultrasonic transducer is assembled into the gas ultrasonic flowmeter, the gas fluid in the sealed pipeline changes along with the change of working conditions, and the pressure in the sealed pipeline also changes along with the change of working conditions. As shown in fig. 8, the pressure acting on the housing of the gas ultrasonic transducer is changed accordingly. The pressure generates a force on the outer diameter of the piezoelectric ceramic piece through the shell, and positive pressure electric output can be generated. And applying an electric field to two ends of the piezoelectric ceramic to generate inverse piezoelectric output. The two outputs are superposed together, and the positive voltage output is random, so that the signal output stability of the gas ultrasonic transducer is directly influenced, and the measurement precision is further influenced.
Disclosure of Invention
Aiming at the defects that the structure is complex, liquid is easy to generate water hammer in a structural pipeline and the like in the prior art, the invention provides the double-shell ultrasonic transducer with the temperature-compensated gas, which can greatly improve the output sensitivity and the detection precision by applying the same voltage, minimize the influence of interference in a pipeline on the transducer as much as possible and improve the reliability of the transducer.
The invention is realized by the following technical scheme:
the invention includes: set gradually piezoceramics, thin film platinum resistance and the matching layer in the casing, wherein: the film platinum thermal resistor and the piezoelectric ceramic respectively output temperature signals and sound wave signals to the outside of the transducer, epoxy resin is injected between the film platinum thermal resistor, the matching layer and the inner wall of the shell, the piezoelectric ceramic is connected with the inner wall of the shell, and a gas medium is injected between the piezoelectric ceramic, the matching layer and the inner wall of the shell.
The inner shell is preferably internally provided with a convex ring, and the convex ring is fixedly connected with the piezoelectric ceramic, so that the rest part of the piezoelectric ceramic is not contacted with the inner wall of the inner shell and is in a free state.
When the piezoelectric ceramic is assembled at a proper position, the installation groove is welded after the installation groove is clamped by proper force, so that the piezoelectric ceramic piece and the convex ring are tightly connected together, the piezoelectric ceramic piece is in a relatively free state in the inner shell, the condition that the whole outer diameter of the piezoelectric ceramic piece is glued and is bonded with the inner diameter of the shell is overcome, and the piezoelectric ceramic piece is in an unrestrained state.
Technical effects
The polarization surfaces at two ends of the piezoelectric ceramic piece in the device are in a longitudinal vibration mode after an electric field is applied, so that the quality of an output waveform is improved, the output power is high, the signal processing is convenient, and the stability is good; because the inner shell is provided with a gap with the length of 10mm and the width of 0.3mm, the gas medium matching layers at the two ends of the piezoelectric ceramic piece can be filled with gas with approximate sound velocity and high polymer materials with low density and low sound velocity according to the actual working condition of a user to form double matching layers.
Compared with the prior art, the invention does not need to install a temperature sensor at a certain position of the flow meter by additionally arranging the hole, so that one leakage point is omitted for the flow meter, the actual temperature of the sensitive element of the gas ultrasonic transducer can be reflected more truly, the hardware balance correction method is closer to the true value, and the measurement precision of the system is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of an outer housing;
FIG. 3 is a schematic view of an inner shell;
FIG. 4 is a schematic view of a piezoelectric ceramic;
in the figure: a is a side view; b is a top view;
FIG. 5 is a schematic diagram of a matching layer;
in the figure: a is a side view; b is a top view;
FIG. 6 is a schematic view of a hard center plane diaphragm;
FIG. 7 is a schematic view of a cable jacket;
FIG. 8 is a schematic diagram of a conventional detection method;
in the figure: the temperature-sensing and temperature-sensing device comprises an outer shell 1, a temperature-sensing hole 2, a thin film platinum thermal resistor 3, an inner shell 4, piezoelectric ceramics 5, a hard central plane diaphragm 6, a gas medium matching layer 7, a matching layer 8, epoxy resin 9, a cable sheath 10, a four-core shielding cable 11, a polarized electrode 12, a convex ring 13, an installation groove 14, a wire groove 15 and a long groove 16.
Detailed Description
As shown in fig. 1, the present embodiment includes: set gradually piezoceramics 5, thin film platinum resistance heater 3 and the matching layer 8 in casing 1, wherein: the film platinum thermal resistor 3 and the piezoelectric ceramic 5 respectively output temperature signals and ultrasonic signals to the outside of the transducer, epoxy resin 9 is arranged between the film platinum thermal resistor 3, the matching layer 8 and the inner wall of the shell 1, the piezoelectric ceramic 5 is connected with the inner wall of the shell 4, and a gas medium 7 is injected between the piezoelectric ceramic 5, the matching layer 8 and the inner wall of the shell 4.
As shown in fig. 2 and fig. 3, the housing 1 is an inner and outer double-layer housing 1 structure, including: an outer shell and an inner shell 4 with a gap therebetween, wherein: the outer shell consists of an outer shell 1, a cable sheath 10 and a hard central plane membrane 6 as a measuring end face, and an inner shell 4 is fixedly arranged in the outer shell.
When the pipeline gaseous medium 7 is natural gas (mixed gas) (15 ℃), the speed of sound c =420m/s, whereas when ammonia gas (18 ℃) is used as the gaseous medium, the speed of sound c =428m/s. Therefore, the gas ultrasonic transducer for measuring the flow of the natural gas rushes in the ammonia gas as a gas medium matching layer, and the matching effect is better.
As shown in fig. 3, a temperature sensing hole is provided on the inner casing 4 at a position facing the thin film platinum thermistor 3, and the temperature sensing hole is close to the piezoelectric ceramic of the sensing element and corresponds to the temperature sensing position of the thin film platinum thermistor.
The inner shell 4 is preferably provided with a protruding ring inside, and the protruding ring is fixedly connected with the piezoelectric ceramic 5, so that the rest part of the piezoelectric ceramic 5 is not contacted with the inner wall of the inner shell 4.
One end of the inner shell 4 is provided with an installation groove, and the size of the installation groove is preferably 10x0.3mm; when the piezoelectric ceramic 5 is assembled at a proper position, the installation groove is clamped by proper force and then welded, so that the piezoelectric ceramic 5 is tightly connected with the convex ring, the piezoelectric ceramic 5 is in a relatively free state in the inner shell 4, the condition that the whole outer diameter of the piezoelectric ceramic 5 is glued and bonded with the inner diameter of the shell 1 is overcome, and the piezoelectric ceramic 5 is in an unrestrained state.
As shown in FIG. 4, the width of the contact surface of the piezoelectric ceramic 5 and the convex ring is preferably less than 2mm, and the thickness of the piezoelectric ceramic 5 is preferably 6.5mm.
The piezoelectric ceramic 5 is provided with a wiring groove, so that a signal wire can be pressed into the wiring groove, and the wiring groove is convenient to be well matched with the convex ring of the inner shell 4.
As shown in fig. 5, the matching layer 8 is made of low-density low-sound-velocity high-molecular fluoroplastic and polyethylene material, so that the ultrasound emitted from the back surface of the piezoelectric element can pass through the gas sound-absorbing layer and then be completely absorbed by the matching layer, and the ultrasound will not interfere with the front surface.
Preferably, the matching layer 8 is provided with a wiring groove to avoid signal wire surrounding.
And a long groove 16 for fixing the thin platinum thermal resistor is processed on the matching layer 8, so that the thin platinum thermal resistor is close to the piezoelectric ceramic.
As shown in fig. 1 and 6, the hard central plane diaphragm 6 is connected to the outer casing 1 by laser welding at points a and b in fig. 1, and the hard central plane diaphragm 6 is not in contact with the piezoelectric ceramic 5, so that pressure changes do not directly act on the outer diameter of the piezoelectric ceramic 5, and no positive voltage electrical signal is output.
The hard central plane membrane 6 is processed by linear cutting and is connected with the outer shell 1 by welding.
The inner shell 4 adopts a method of combining a hard plane membrane and a thin film plane membrane, and a welding method is adopted to form the hard center plane membrane, so that the hard center plane part and the inner shell 4 are welded to resist working pressure, the thin film part and the outer shell 1 are welded at a C point in a figure 2, and the sealing problem of the double shells is solved, thereby not only solving the working pressure resistance of the transducer, but also reducing the influence of working condition change on the inner shell 4 and improving the sensitivity and the reliability.
As shown in fig. 7, the cable sheath 10 is welded to the housing 1 for increasing reliability, and the inner diameter of the film wall portion of the cable sheath 10 and the four-core shielded cable 11 are clamped, thereby achieving reliable grounding to reduce electromagnetic interference signals.
The device is assembled in the following way:
1. welding the hard central plane film and the hard central plane with the inner shell in sequence;
2. fixing the thin film platinum thermal resistor in the long groove of the matching layer;
3. sequentially assembling the piezoelectric ceramic 5 and the matching layer 8 into the inner shell 4, ensuring that the two end faces of the piezoelectric ceramic 5 are provided with the gas matching layers, clamping the inner shell 4, and welding a gap on the inner shell; then, testing the frequency and the ultrasonic waveform by using an impedance meter to ensure that the piezoelectric ceramic 5 is tightly matched with the convex ring on the inner shell;
4. after the inner shell 4 and the outer shell 1 are assembled, welding the hard central plane diaphragm 6 and the measuring end face of the outer shell 1, carrying out a voltage withstanding test, and testing the frequency and the ultrasonic waveform by using an impedance instrument after the test is finished;
5. welding a four-core shielded cable, testing frequency and ultrasonic wave shape by using an impedance meter, and then pouring glue;
6. installing the cable sheath and clamping the thin wall part of the cable sheath to ensure the tight combination of the thin wall part and the shielding layer of the four-core shielding cable, then checking the grounding resistance and testing the frequency and ultrasonic wave shape by an impedance meter.
The foregoing embodiments may be modified in many different ways by one skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and not by the preceding embodiments, and all embodiments within their scope are intended to be limited by the scope of the invention.
Claims (3)
1. The utility model provides a two casing area temperature tonifying qi body ultrasonic transducer which characterized in that includes: set gradually piezoceramics, film platinum resistance and the matching layer in the casing, wherein: the film platinum thermal resistor and the piezoelectric ceramic respectively output a temperature signal and an ultrasonic signal to the outside of the transducer, epoxy resin is arranged between the film platinum thermal resistor, the matching layer and the inner wall of the shell, the piezoelectric ceramic is connected with the inner wall of the shell, and a gas medium is filled between the piezoelectric ceramic, the matching layer and the inner wall of the shell;
the casing be inside and outside double-deck shell structure, include: an outer shell and an inner shell with a gap therebetween, wherein: the outer shell consists of an outer shell body, a cable sheath and a hard central plane membrane as a measuring end face, and the inner shell is fixedly arranged in the outer shell;
the inner shell is preferably internally provided with a convex ring, and the convex ring is fixedly connected with the piezoelectric ceramic, so that the rest part of the piezoelectric ceramic is not contacted with the inner wall of the inner shell;
when the piezoelectric ceramic is assembled at a proper position, the installation groove is welded after the installation groove is clamped by proper force, so that the piezoelectric ceramic piece and the convex ring are tightly connected together, the piezoelectric ceramic piece is in a relatively free state in the inner shell, the condition that the whole outer diameter of the piezoelectric ceramic piece is glued and is bonded with the inner diameter of the shell is overcome, and the piezoelectric ceramic piece is in an unrestrained state.
2. The dual-casing ultrasonic transducer with temperature-sensing gas supply of claim 1, wherein a temperature-sensing hole is formed in the inner casing at a position facing the thin-film platinum thermistor.
3. The dual-casing ultrasonic transducer with temperature-compensated gas as claimed in claim 1, wherein the size of the contact surface of the connecting portion of the piezoelectric ceramic and the convex ring is less than 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611214899.2A CN106525181B (en) | 2016-12-26 | 2016-12-26 | Double-shell ultrasonic transducer with temperature compensation gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611214899.2A CN106525181B (en) | 2016-12-26 | 2016-12-26 | Double-shell ultrasonic transducer with temperature compensation gas |
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| Publication Number | Publication Date |
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| CN106525181A CN106525181A (en) | 2017-03-22 |
| CN106525181B true CN106525181B (en) | 2023-04-18 |
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| CN201611214899.2A Active CN106525181B (en) | 2016-12-26 | 2016-12-26 | Double-shell ultrasonic transducer with temperature compensation gas |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207019729U (en) * | 2017-08-01 | 2018-02-16 | 青岛积成电子股份有限公司 | Combined axial correlation type ultrasonic transducer for gas flow measurement |
| CN107990924A (en) * | 2017-12-07 | 2018-05-04 | 广东奥迪威传感科技股份有限公司 | A kind of ultrasonic sensor |
| CN108634986A (en) * | 2018-05-16 | 2018-10-12 | 芜湖众梦电子科技有限公司 | A kind of medical supersonic transducer with wireless transmission function |
| CN112649057A (en) * | 2020-12-28 | 2021-04-13 | 金卡智能集团股份有限公司 | Ultrasonic transducer |
| CN114786093A (en) * | 2022-04-19 | 2022-07-22 | 山东理工大学 | High-performance underwater acoustic transducer structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004138585A (en) * | 2002-10-21 | 2004-05-13 | Matsushita Electric Ind Co Ltd | Case for ultrasonic transducer, manufacturing method for the case and manufacturing method for ultrasonic transducer, and ultrasonic transducer, and ultrasonic flowmeter having ultrasonic transducer |
| JP2004325169A (en) * | 2003-04-23 | 2004-11-18 | Matsushita Electric Ind Co Ltd | Device for measuring fluid flow |
| CN201611266U (en) * | 2010-03-16 | 2010-10-20 | 山东力创科技有限公司 | Ultrasonic transducer of heat meter |
| WO2015052269A1 (en) * | 2013-10-09 | 2015-04-16 | Pepperl + Fuchs Gmbh | Ultrasound sensor |
| CN206387458U (en) * | 2016-12-26 | 2017-08-08 | 上海宾峰仪器科技有限公司 | Double-casing band temperature compensation gas ultrasonic transducer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7397168B2 (en) * | 2005-08-12 | 2008-07-08 | Daniel Measurement And Control, Inc. | Transducer housing for an ultrasonic fluid meter |
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2016
- 2016-12-26 CN CN201611214899.2A patent/CN106525181B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004138585A (en) * | 2002-10-21 | 2004-05-13 | Matsushita Electric Ind Co Ltd | Case for ultrasonic transducer, manufacturing method for the case and manufacturing method for ultrasonic transducer, and ultrasonic transducer, and ultrasonic flowmeter having ultrasonic transducer |
| JP2004325169A (en) * | 2003-04-23 | 2004-11-18 | Matsushita Electric Ind Co Ltd | Device for measuring fluid flow |
| CN201611266U (en) * | 2010-03-16 | 2010-10-20 | 山东力创科技有限公司 | Ultrasonic transducer of heat meter |
| WO2015052269A1 (en) * | 2013-10-09 | 2015-04-16 | Pepperl + Fuchs Gmbh | Ultrasound sensor |
| CN206387458U (en) * | 2016-12-26 | 2017-08-08 | 上海宾峰仪器科技有限公司 | Double-casing band temperature compensation gas ultrasonic transducer |
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