CN206387458U - Double-casing band temperature compensation gas ultrasonic transducer - Google Patents
Double-casing band temperature compensation gas ultrasonic transducer Download PDFInfo
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- CN206387458U CN206387458U CN201621433618.8U CN201621433618U CN206387458U CN 206387458 U CN206387458 U CN 206387458U CN 201621433618 U CN201621433618 U CN 201621433618U CN 206387458 U CN206387458 U CN 206387458U
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- piezoelectric ceramics
- temperature compensation
- ultrasonic transducer
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Abstract
A kind of Double-casing band temperature compensation gas ultrasonic transducer, including：It is set in turn in piezoelectric ceramics, film platinum resistance thermometer sensor, and double matching layers in housing, the utility model mainly solves operating mode interference using Double-casing and not acted directly on gas ultrasound transducer body inner casing, so have the advantage that operating mode is disturbed, such as strong change, vibration, minimum is influenceed on transducer, stability is improved.The change of fixed piezoelectric ceramics mode causes piezoelectric ceramics to be under relatively more free state, equal voltage, and extensional vibration output power improves sensitivity, improves output waveform quality.After Double-casing, near sonic gas can be connect according to the injection of gas with various operating mode and make matching layer, reduced sound deflection, improve acoustic emission efficiency.Hard central plane film design, solves double hulled sealing problem, the pressure-resistant problem of transducer is solved again, and influence of the working conditions change to inner casing is reduced again, sensitivity and reliability is improved.
Description
Technical field
The utility model relates to a kind of technology in ultrasound detection field, specifically a kind of Double-casing band temperature compensation gas surpasses
Sonic transducer.
Background technology
When the polarised direction in piezoelectric ceramics applies electric field, piezoelectric ceramics will produce mechanically deform or machine in a certain direction
Tool stress.Deformation or stress also disappear therewith after external electric field is removed.This physical phenomenon is referred to as inverse piezoelectric effect.Utilize inverse pressure
Electrical effect can be made into ultrasonic wave electric organ.Gas ultrasound transducer and liquid ultrasonic transducing can be made into by certain structure type
Device.Change of the gas ultrasound transducer to state parameters such as the temperature of fluid, pressure and flow velocitys for gas medium flow measurement
Change is especially sensitive, can all cause corresponding sonic velocity change, and then influence measurement accuracy.
Gas ultrasound transducer be assembled into after gas ultrasonic flowmeter sealing pipeline in gaseous fluid with the change of operating mode
Change, the pressure in sealing pipeline is also with change.As shown in figure 8, doing so with the pressure on gas ultrasound transducer enclosure
Also vary therewith.Pressure produces power by shell to piezoelectric ceramic piece external diameter can equally produce malleation electricity output.Piezoelectricity is made pottery
Porcelain two ends, which apply, produces inverse piezoelectricity output after electric field.Two kinds of outputs are superimposed, due to malleation electricity output be it is random, so
The stable output signal of gas ultrasound transducer is just directly affects, and then have impact on measurement accuracy.
Utility model content
The utility model is complex and liquid easily produces water hammer in structure pipeline for prior art construction
Etc. defect, a kind of Double-casing band temperature compensation gas ultrasonic transducer is proposed, output spirit can be increased substantially by applying under equal voltage
Sensitivity and accuracy of detection, the as far as possible influence the interference in pipeline to transducer are minimized, and improve the reliable of transducer
Property.
The utility model is achieved through the following technical solutions：
The utility model includes：Piezoelectric ceramics, film platinum resistance thermometer sensor, and matching layer in housing are set in turn in, wherein：
Film platinum resistance thermometer sensor, and piezoelectric ceramics respectively by outside temperature signal and sound wave signal output to transducer, film platinum resistance thermometer sensor,
Epoxy resin is marked between matching layer and inner walls, piezoelectric ceramics is connected with inner walls and piezoelectric ceramics, matching layer and shell
Gas medium is marked between internal wall.
Described inner housing inner is preferably provided with bulge loop, is fixedly connected by the bulge loop with the piezoelectric ceramics, so that
Piezoelectric ceramics remainder is not contacted with inner casing inwall, in free state.
One end of described inner casing is provided with mounting groove, when piezoelectric ceramics is assembled in position, by installing groove portion
The mounting groove is welded again after being clamped with appropriate forces in position so that piezoelectric ceramic piece is tightly joined together with the bulge loop so that pressure
Electroceramics piece, in relatively more free state, overcomes the whole external diameter of piezoelectric ceramic piece all gluing and housing inner diameter in inner housing
The state bonded together, piezoelectric ceramic piece is in not free state.
Technique effect
It is longitudinal vibration mode that piezoelectric ceramic piece two ends plane of polarization in the present apparatus, which applies after electric field, so as to improve output
Waveform quality, output power, convenient signal treatment, stability is good；Because inner casing is provided with long 10mm, wide 0.3mm gaps, pressure
The gas medium matching layer at electroceramics piece two ends can inject the close gas of the velocity of sound and low-density according to the actual condition of user, low
The high polymer material of the velocity of sound forms double matching layers.
Compared with prior art, the utility model is not used in the other perforate mounting temperature sensor in certain of flow instrument,
Flow instrument is minused an easy leakage point, and can more really reflect the reality of gas ultrasound transducer sensing element
Border temperature so that hardware equalizer correction method improves the measuring precision closer to true value.
Brief description of the drawings
Fig. 1 is the utility model structural representation；
Fig. 2 is shell body schematic diagram；
Fig. 3 is inner casing schematic diagram；
Fig. 4 is piezoelectric ceramics schematic diagram；
In figure：A is side view；B is top view；
Fig. 5 is matching layer schematic diagram；
In figure：A is side view；B is top view；
Fig. 6 is hard central plane diaphragm schematic diagram；
Fig. 7 is cable cover(ing) schematic diagram；
Fig. 8 is existing detection method schematic diagram；
In figure：1 shell body, 2 temperature sensing holes, 3 film platinum resistance thermometer sensor,s, 4 inner casings, 5 piezoelectric ceramics, 6 hard central plane diaphragms, 7
Gas medium matching layer, 8 matching layers, 9 epoxy resin, 10 cable cover(ing)s, 11 4 core shielded cables, 12 polarizing electrodes, 13 bulge loops,
14 mounting grooves, 15 metallic channels, 16 elongate recesses.
Embodiment
As shown in figure 1, the present embodiment includes：Be set in turn in piezoelectric ceramics 5 in housing 1, film platinum resistance thermometer sensor, 3 and
With layer 8, wherein：Film platinum resistance thermometer sensor, 3 and piezoelectric ceramics 5 respectively export temperature signal and ultrasonic signal to outside transducer
Portion, is provided with epoxy resin 9 between film platinum resistance thermometer sensor, 3, matching layer 8 and the inwall of housing 1, piezoelectric ceramics 5 is connected with the inwall of housing 4
And it is marked with gas medium 7 between piezoelectric ceramics 5, matching layer 8 and the inwall of housing 4.
As shown in Figures 2 and 3, described housing 1 is the inside and outside structure of double Shell 1, including：Shell and there is gap therewith
Inner casing 4, wherein：Shell is made up of shell body 1, cable cover(ing) 10 and the hard central plane diaphragm 6 as measurement end face, inner casing
4 are fixedly installed on enclosure.
When pipeline gas medium 7 is natural gas (mixed gas) (15 DEG C), velocity of sound c=420m/s, and when using ammonia
When (18 DEG C) are as gas medium, velocity of sound c=428m/s.Gas ultrasound transducer so for natural gas flow measurement is rushed in
Ammonia is as gas medium matching layer, and matching effect can be more preferable.
As shown in figure 3, being just provided with temperature sensing hole to the position of film platinum resistance thermometer sensor, 3 on described inner casing 4, the temperature sensing hole is approached
The piezoelectric ceramics of sensing element is simultaneously corresponding with the temperature-sensitive position of film platinum resistance thermometer sensor,.
Bulge loop is preferably provided with inside described inner casing 4, is fixedly connected by the bulge loop with the piezoelectric ceramics 5, so that
The remainder of piezoelectric ceramics 5 is obtained not contact with the inwall of inner casing 4.
One end of described inner casing 4 is provided with mounting groove, and the mounting groove is preferably dimensioned to be 10x0.3mm；When piezoelectric ceramics 5
Assembling in position when, by install groove location clamped with appropriate forces after weld the mounting groove again so that piezoelectric ceramics 5 with
The bulge loop is tightly joined together so that piezoelectric ceramics 5, in relatively more free state, overcomes piezoelectricity pottery in inner casing 4
The state that the whole external diameter of porcelain 5 all gluings bond together with the internal diameter of housing 1, piezoelectric ceramics 5 is in not free state.
As shown in figure 4, the size of described piezoelectric ceramics 5 and the coupling part interface width of bulge loop is preferably smaller than 2mm,
The thickness of described piezoelectric ceramics 5 is preferably 6.5mm.
Described piezoelectric ceramics 5 is provided with cabling channel, signal wire can be pressed into cabling channel, is easy to fine with the bulge loop of inner casing 4
Coordinate.
As shown in figure 5, the macromolecule fluoroplastics of the described use of matching layer 8 low-density, in a low voice speed, polythene material system
Into so that the ultrasound sent from the piezoelectric element back side can all be sucked by gas absorbent treatment, then matched layer, will not be to front
Send ultrasonic interference.
It is preferred that described matching layer 8 is provided with cabling channel, to avoid signal wire from surrounding.
The elongate recesses 16 for fixing thin platinum resistance thermometer sensor, are machined with described matching layer 8, make thin platinum resistance thermometer sensor, close
Piezoelectric ceramics.
As shown in figures 1 to 6, described hard central plane diaphragm 6 by the laser welding mode of a, b point in such as Fig. 1 with
Shell body 1 is connected and hard central plane diaphragm 6 is not in contact with piezoelectric ceramics 5 so that pressure change will not act directly on pressure
On the external diameter of electroceramics 5, also there will be no malleation electric signal output.
Described hard central plane diaphragm 6 is handled using wire cutting, and is connected by welding with shell body 1.
The method that described inner casing 4 is combined using hard planar film with thin film planar film, in being formed firmly using welding method
Heart planar film so that hard central planer portion is welded with inner casing 4 to resist operating pressure, and film portion is located at Fig. 2's with shell 1
C is spot welded, and is solved double hulled sealing problem, had so both been solved the resistance to operating pressure of transducer, working conditions change is reduced again
Influence to inner casing 4, improves sensitivity and reliability.
As shown in fig. 7, described cable cover(ing) 10 is welded to increase reliability with shell 1, the film of the cable cover(ing) 10
Wall part internal diameter is handled with four core shielded cables 11 through clamping, so as to realize reliable ground to reduce interference of electromagnetic field signal.
The present apparatus is assembled in the following manner：
1st, hard central plane film, hard central plane and inner housing are welded successively；
2nd, film platinum resistance thermometer sensor, is fixed in the elongate recesses of matching layer；
3rd, piezoelectric ceramics 5 and matching layer 8 are fitted into inner casing 4 successively, and ensures that the both ends of the surface of piezoelectric ceramics 5 have gas
It is right after layer, then after inner casing 4 is clamped, the gap on inner housing is welded；Then impedance instrument test frequency and ultrasound are used
Ripple waveform, to ensure that piezoelectric ceramics 5 is fitted close with the bulge loop on inner housing；
4th, after assembling inner casing 4 and shell body 1, the measurement end face of hard central plane diaphragm 6 and shell body 1 is welded, and
Voltage-withstand test is carried out, impedance instrument test frequency and ultrasonic wave waveform is used after the completion of test again；
5th, four core shielded cables are welded, and with encapsulating after impedance instrument test frequency and ultrasonic wave waveform；
The 6th, the thin-walled portion of cable cover(ing) and clamping cables sheath is installed, to ensure thin-walled portion and four core shielded cables
Screen layer is combined closely, then examines grounding resistance and with impedance instrument test frequency and ultrasonic wave waveform.
Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the utility model principle and objective with
Different modes carries out local directed complete set to it, and protection domain of the present utility model is defined by claims and not by above-mentioned specific
Implementation is limited, and each implementation in the range of it is by the constraint of the utility model.
Claims (6)
1. a kind of Double-casing band temperature compensation gas ultrasonic transducer, it is characterised in that including：It is set in turn in the piezoelectricity pottery in housing
Porcelain, film platinum resistance thermometer sensor, and matching layer, wherein：Film platinum resistance thermometer sensor, and piezoelectric ceramics are defeated by temperature signal and ultrasonic signal respectively
Go out to transducer, be provided between film platinum resistance thermometer sensor, matching layer and inner walls in epoxy resin, piezoelectric ceramics and housing
Wall is connected and between piezoelectric ceramics, matching layer and inner walls filled with gas medium.
2. Double-casing band temperature compensation gas ultrasonic transducer according to claim 1, it is characterized in that, described housing is inside and outside
Double-layer shell structure, including：Shell and the inner casing that there is gap therewith, wherein：Shell is by shell body, cable cover(ing) and is used as survey
The hard central plane diaphragm composition of end face is measured, inner casing is fixedly installed on enclosure.
3. Double-casing band temperature compensation gas ultrasonic transducer according to claim 2, it is characterized in that, it is just right on described inner casing
The position of film platinum resistance thermometer sensor, is provided with temperature sensing hole.
4. the Double-casing band temperature compensation gas ultrasonic transducer according to Claims 2 or 3, it is characterized in that, in described inner casing
Portion is provided with bulge loop, is fixedly connected by the bulge loop with the piezoelectric ceramics, so that in piezoelectric ceramics remainder and inner casing
Wall is not contacted.
5. Double-casing according to claim 4 band temperature compensation gas ultrasonic transducer, it is characterized in that, one end of described inner casing
Provided with mounting groove, when piezoelectric ceramics is assembled in position, by welding this again to installing after groove location is clamped with appropriate forces
Mounting groove so that piezoelectric ceramic piece is tightly joined together with the bulge loop so that piezoelectric ceramic piece in inner housing be in than
More free state, overcomes the state that the whole external diameter of piezoelectric ceramic piece all gluings bond together with housing inner diameter, piezoelectricity pottery
Ceramics is in not free state.
6. Double-casing according to claim 4 band temperature compensation gas ultrasonic transducer, it is characterized in that, described piezoelectric ceramics with
The size of the coupling part contact surface of bulge loop is less than 2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621433618.8U CN206387458U (en) | 2016-12-26 | 2016-12-26 | Double-casing band temperature compensation gas ultrasonic transducer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621433618.8U CN206387458U (en) | 2016-12-26 | 2016-12-26 | Double-casing band temperature compensation gas ultrasonic transducer |
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| Publication Number | Publication Date |
|---|---|
| CN206387458U true CN206387458U (en) | 2017-08-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201621433618.8U Active CN206387458U (en) | 2016-12-26 | 2016-12-26 | Double-casing band temperature compensation gas ultrasonic transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525181A (en) * | 2016-12-26 | 2017-03-22 | 上海宾峰仪器科技有限公司 | Double-shell gas ultrasonic transducer with temperature compensation function |
| CN111482807A (en) * | 2020-04-22 | 2020-08-04 | 南京丛迈信息科技有限公司 | Transducer part semi-automatic processing device |
-
2016
- 2016-12-26 CN CN201621433618.8U patent/CN206387458U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525181A (en) * | 2016-12-26 | 2017-03-22 | 上海宾峰仪器科技有限公司 | Double-shell gas ultrasonic transducer with temperature compensation function |
| CN106525181B (en) * | 2016-12-26 | 2023-04-18 | 上海宾峰仪器科技有限公司 | Double-shell ultrasonic transducer with temperature compensation gas |
| CN111482807A (en) * | 2020-04-22 | 2020-08-04 | 南京丛迈信息科技有限公司 | Transducer part semi-automatic processing device |
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