CN109141556A - A kind of embedded broad beam ultrasonic liquid flow measurement device of piezoelectric vibrator - Google Patents
A kind of embedded broad beam ultrasonic liquid flow measurement device of piezoelectric vibrator Download PDFInfo
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- CN109141556A CN109141556A CN201811010443.3A CN201811010443A CN109141556A CN 109141556 A CN109141556 A CN 109141556A CN 201811010443 A CN201811010443 A CN 201811010443A CN 109141556 A CN109141556 A CN 109141556A
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- piezoelectric vibrator
- boss
- exciting source
- sealing structure
- pipeline section
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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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- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The present invention relates to a kind of embedded broad beam ultrasonic liquid flow measurement devices of piezoelectric vibrator, the device includes pipeline section, the first exciting source, the second exciting source and control operational part, and exciting source is made of boss, piezoelectric vibrator, preload sealing structure and exciting source lead；Boss is structure as a whole with pipeline section, and section or other media are not present therebetween；Piezoelectric vibrator is directly contacted with boss by couplant, is pre-tightened sealing structure and is provided pretightning force for it and guarantee to seal, and is controlled operational part and is provided excitation electric signal for piezoelectric vibrator and handle signal is received, obtains fluid flow in pipeline section.Apparatus of the present invention exciting source is simple and compact for structure, and processing cost is low, and does not contact with fluid, and stream field does not interfere；Piezoelectric vibrator is close to by couplant with tube wall, no matching layer, improves energy transfer efficiency；Exciting source drives tube wall vibration to form the larger surface of emission, has the ability of certain anti-bubble, solid impurity interference.
Description
Technical field
The present invention relates to a kind of ultrasonic flow rate measuring devices, more particularly, to a kind of embedded broad beam ultrasound of piezoelectric vibrator
Liquid flow measurement device.
Background technique
Ultrasonic flow rate measuring instrumentss are the ultrasonic wave progress flows for being fluid affected, being able to reflect fluid flow rate by observing
The instrument of measurement." time difference method " is a kind of common measuring principle, when the fluid to be measured flowing in pipeline, transmitting terminal transducing
For the ultrasonic wave that device generates during passing through medium, actual spread speed can regard the velocity of sound and fluid flow rate in stationary fluid as
It is vector superposed.Therefore for same distance, sound wave propagation time when fair current is with adverse current is different, by precisely surveying
The transition time of amount concurrent-countercurrent can find out fluid to be measured flow velocity and then obtain flow.
China Patent Publication No. CN106153132A, publication date on November 23rd, 2016, the entitled of innovation and creation is based on
The contactless flow measuring system and method for Lamb wave, this application discloses a kind of contactless measurements of fluid flow
System, the system generate resonance using special energy converter excitation tube wall, generate Lamb wave in pipe in biggish wall section
Fluid flow rate measures, which has certain anti-interference to bubble impurity etc., and installs more convenient, deficiency
Place is to be set to pipeline external and transducer system energy transfer efficiency that working surface is not contacted with tested pipeline is low, is received
Signal-to-Noise is poor.
It is often propagated in the pipe wall compared to intrusive or plug-in type ultrasonic flow rate measuring device, the sound wave of external clamping device
Longer distance, but external clamping is affected by pipeline condition, and acoustic signals often have compared with lossy；It is intrusive super with plug-in type
Acoustic streaming measuring device energy converter is directly contacted with fluid, and loss of signal is small, but the fluid flow fields state around energy converter is multiple
Miscellaneous, very important to the interference of acoustic signals, furthermore acoustic beam sphere of action is relatively small, is easy by shadows such as bubble, impurity particles
It rings.The invention patent comprehensively considers the advantage and disadvantage of external clamping and intrusive Vltrasonic device, and plan designs a kind of contactless and sound
The small ultrasonic flow rate measuring device of wave loss of signal.
Summary of the invention
It is an object of the invention to solve following problems:
(1) existing external clamping ultrasonic flow rate measuring device needs to clean before measuring scale removal, repeatedly installation positioning, measurement
Preparation complexity is cumbersome, and signal is easy to be influenced by measurement pipe road situation；
(2) existing intrusive pipeline section ultrasonic flow rate measuring device energy converter is directly contacted with flow field, and meeting stream field causes one
Fixed interference, while the property of fluid to be measured is required；
(3) existing intrusive ultrasonic flowmeter acoustic signals are easy to be influenced by bubble, impurity particle in measuring medium,
So that receiving signal attenuation.
A kind of embedded broad beam ultrasonic liquid flow measurement device of piezoelectric vibrator includes pipeline section, the first exciting source, second
Exciting source and control operational part；
First exciting source includes first boss, the first piezoelectric vibrator, the first preload sealing structure, the first exciting source
Lead；Second exciting source includes second boss, the second piezoelectric vibrator, the second preload sealing structure, the second exciting source lead；
First exciting source and the second exciting source is located at pipeline section heteropleural, and the second piezoelectric vibrator of the second exciting source
Positioned at the opposite side of the first piezoelectric vibrator of the first exciting source and the center line of the two it is parallel；
The first boss is structure as a whole with pipeline section, section or other media is not present therebetween, first is convex
Platform is arranged the first truncation surface and has the first mounting hole；Second boss is structure as a whole with pipeline section, and section is not present therebetween
Or other media, second boss are arranged the second truncation surface and have the second mounting hole；
In first mounting hole of the first piezoelectric vibrator insertion first boss, and it is directly convex with first by couplant
Platform contact, the first preload sealing structure for the first piezoelectric vibrator provide pretightning force, ensure to position, while being sealed to prevent the
Media contact except one piezoelectric vibrator and the first exciting source；First exciting source lead is drawn from the two poles of the earth of the first piezoelectric vibrator,
Sealing structure is pre-tightened across first, is connected with control operational part；
In second mounting hole of the second piezoelectric vibrator insertion second boss, and it is directly convex with second by couplant
Platform contact, the second preload sealing structure for the first piezoelectric vibrator provide pretightning force, ensure to position, while being sealed to prevent the
Media contact except two piezoelectric vibrators and the second exciting source；Second exciting source lead is drawn from the two poles of the earth of the second piezoelectric vibrator,
Sealing structure is pre-tightened across second, is connected with control operational part；
The control operational part provides excitation electric signal simultaneously for first piezoelectric vibrator and second piezoelectric vibrator
It handles electric signal is received, fluid flow in run of designing.
Optionally, the pipeline section both ends have pipe screw thread, are connected in pipeline to be measured by pipe screw thread.
Optionally, the pipeline section both ends have flange arrangement, through flanged joint into pipeline to be measured.
Optionally, the position of first truncation surface is anti-between incidence wave and the juncture area of pipeline section outside wall surface and first
Between ejected wave and the juncture area of tube wall outside wall surface.
Optionally, the first preload sealing structure includes the first back-cover, the first spring, the first top cover, the first sealing
Part and the first sealant, the first top cover are connect by screw thread or fastening screw with first boss, and the first spring compression institute is passed through
The first back-cover is stated, the first back-cover compresses the first piezoelectric vibrator, and first seal is placed between the first top cover and first boss, and first
Sealant is sealed the aperture of the first top cover.
Optionally, the second preload sealing structure includes the second back-cover, second spring, the second top cover, the second sealing
Part and the second sealant, the second top cover are connect by screw thread or fastening screw with second boss, and second spring compression the is passed through
Two back-covers, the second back-cover compress the second piezoelectric vibrator, and second seal is placed between the second top cover and second boss, the second sealing
Glue is sealed the aperture of the second top cover.
Optionally, the first preload sealing structure is the first casting glue, and second pre-tightens sealing structure as the second encapsulating
Glue.
The beneficial effects of the present invention are: the pressure in the embedded broad beam ultrasonic liquid flow measurement device of piezoelectric vibrator
Electric tachometer indicator is directly contacted with pipe wall material by couplant, and piezoelectric vibrator front end reduces energy dissipation without matching layer, improves energy
Transmission efficiency；The structure of exciting source is simple, and processing and fabricating cost is low, and reliability is preferable；Exciting source is not contacted with flow field, Bu Huigan
Flow-disturbing field；Exciting source drives tube wall vibration, forms the larger surface of emission, has the ability of certain anti-bubble, solid impurity interference.
Detailed description of the invention
Fig. 1 is the diagrammatic cross-section of specific embodiment one；
Fig. 2 is the position view of the first truncation surface in specific embodiment one；
Fig. 3 is the diagrammatic cross-section of specific embodiment two；
Fig. 4 is the diagrammatic cross-section of specific embodiment three；
Specific embodiment
Specific embodiment 1: introducing present embodiment, a kind of embedded broad beam ultrasonic liquid of piezoelectric vibrator in conjunction with Fig. 1
Flow measurement device, including pipeline section 1, the first exciting source 2, the second exciting source 3 and control operational part.
Pipeline section 1 includes the first pipeline section 101, the second pipeline section 102, third pipeline section 103.Wherein, the first pipeline section 101 and third pipe
Section 103 has pipe screw thread, is connected into pipeline to be measured by pipe screw thread；Second pipeline section 102 is fluid measurement pipeline section.
First exciting source 2 is close including first boss 201, the first piezoelectric vibrator 202, the first organic glass back-cover 203, first
Sealing 204, the first spring 205, the first screw top closures 206, the first sealing mouth 207 and the first exciting source lead 208；Described
Two exciting sources 3 include second boss 301, the second piezoelectric vibrator 302, the second organic glass back-cover 303, second seal 304, the
Two springs 305, the second screw top closures 306, the second sealing mouth 307 and the second exciting source lead 308.Wherein, first boss 201
It is structure as a whole with pipeline section 1, section or other media is not present therebetween；Second boss 301 and pipeline section 1 are also integrated knot
Section or other media are not present therebetween in structure；First boss 201, second boss 301 and 1 material of pipeline section are 304 stainless
Steel.
First exciting source 2 is identical as 3 structure of the second exciting source, carries out feature description by taking the first exciting source 2 as an example.First pressure
202 back of electric tachometer indicator is embedded in the first organic glass back-cover 203, and front end protrudes from 203 surface of the first organic glass back-cover, and first
The assembly that piezoelectric vibrator 202 and the first organic glass back-cover 203 are formed is embedded into the first mounting hole of first boss 201,
And 202 front end of the first piezoelectric vibrator is directly in contact with first boss 201 by couplant, it is ensured that the first piezoelectric vibrator 202
Preliminary installation positioning；First screw top closures 206 are connect by screw thread with first boss 201, and with the first spring 205 from back
It compresses the first organic glass back-cover 203 and then provides pretightning force for the first piezoelectric vibrator 202；First exciting source lead 208 is from
The two poles of the earth of one piezoelectric vibrator 202 are drawn, and through-hole, the first spring 205, first in the first organic glass back-cover 203 are sequentially passed through
The first sealing mouth 207 on screw top closures 206 is ultimately connected to control operational part；First screw top closures 206 and first boss
Guarantee the sealing at connection screw thread equipped with first seal 204 between 201；The associated components of first exciting source 2 install it
The sealing from epoxy glue the first exciting source lead 208 of guarantee is poured into from the first sealing mouth 207 afterwards.
Illustrate the broad beam work in the embedded broad beam ultrasonic liquid flow measurement device of piezoelectric vibrator in conjunction with Fig. 1 and Fig. 2
Make mechanism.The excitation voltage signal that control operational part generates acts on the first piezoelectric vibrator by the first exciting source lead 208
202,202 forced vibration of the first piezoelectric vibrator drives first boss 201 to vibrate, vibrates in the form of solid wave via couplant
It propagates；Incidence wave 501, which travels to, occurs reflection and refraction at inner tubal wall 104, the first refractive wave beam 401 of generation is passed across fluid
To at the second piezoelectric vibrator 302, the first back wave 502 of generation continues to propagate along tube wall direction, occurs at outer tube wall 105 anti-
It penetrates and reflects, the refracted wave of formation is transmitted in air, and the back wave continuation of formation is propagated forward, and reflection and folding constantly occurs
It penetrates.First refractive wave beam 401 is the first beam sound wave injected in fluid, the second refracted beam 402 and third later in Fig. 1
Refracted beam 403 is respectively the second beam sound wave and third Shu Shengbo entered in fluid, therefore sound wave covers a wide range, i.e.,
Making containing a certain amount of bubble, solid particle in fluid, acoustic wave segment signal also can smoothly be received piezoelectric vibrator reception, thus
Improve anti-interference.
In order to guarantee acoustic signals quality that the second piezoelectric vibrator 302 receives, need to generate the first piezoelectric vibrator 202
Most of sound wave by the second pipeline section 102 tube wall reflection after enter pipeline section in fluid mass.As shown in Fig. 2, by first
Truncation surface 210 is arranged between incidence wave 501 and the juncture area of outer tube wall 105 and the first back wave 502 and outer tube wall 105
Between juncture area, i.e., in figure in dotted line section.In this way, the first back wave 502 can be reflected by outer tube wall 105 completely, simultaneously
The first truncation surface 210 is avoided to generate interference to incidence wave 501.
The calculating of fluid flow rate uses " time difference method " principle, calculates flow velocity according to the concurrent-countercurrent time difference of measurement, according to
(1) following formula seeks flow velocity:
:
Wherein d is internal diameter of the pipeline, and Δ t is the concurrent-countercurrent time difference, and v is fluid to be measured flow velocity, and c is the velocity of sound in fluid, and θ is
The refraction angle of acoustic beam in a fluid, then total flow expression formula be formula (2):
Wherein k is correction factor, and A is pipeline section product, and Q is total flow.
Specific embodiment 2: embodiment is described with reference to Fig. 3, the difference of present embodiment and specific embodiment one
It is that pipeline section 1 includes first flange 106, second flange 107 and the second pipeline section 102, pipeline section 1 passes through first flange 106 and the
Two flanges 107 are connected in measurement pipeline.
Specific embodiment 3: illustrating this present embodiment, the area of present embodiment and specific embodiment one in conjunction with Fig. 4
It is not that the first exciting source 2 includes first boss 201, the first piezoelectric vibrator 202, the first exciting source lead 208 and the first filling
Sealing 209, the second exciting source 3 include second boss 301, the second piezoelectric vibrator 302, the second exciting source lead 308 and second
Casting glue 309；In order to guarantee that casting glue provides certain pretightning force, when encapsulating adhesive curing, will be placed in pressure chamber, be guaranteed permanent
Warm constant pressure solidification.
Claims (7)
1. a kind of embedded broad beam ultrasonic liquid flow measurement device of piezoelectric vibrator, including pipeline section, the first exciting source, second swash
Vibration source and control operational part；
It is characterized by: first exciting source includes first boss, the first piezoelectric vibrator, first pre-tightens sealing structure, the
One exciting source lead；Second exciting source includes second boss, the second piezoelectric vibrator, the second preload sealing structure, the second exciting source
Lead；
First exciting source and the second exciting source is located at pipeline section heteropleural, and the second piezoelectric vibrator of the second exciting source is located at
The opposite side of first piezoelectric vibrator of the first exciting source and center line of the two is parallel；
The first boss is structure as a whole with pipeline section, and there is no sections or other media, first boss to set therebetween
Set the first truncation surface and with the first mounting hole；Second boss is structure as a whole with pipeline section, therebetween there is no section or
Other media, second boss are arranged the second truncation surface and have the second mounting hole；
In first mounting hole of the first piezoelectric vibrator insertion first boss, and directly connect with first boss by couplant
Touching, the first preload sealing structure provides pretightning force for the first piezoelectric vibrator, ensures to position, while being sealed to prevent the first pressure
Media contact except electric tachometer indicator and the first exciting source；First exciting source lead is drawn from the two poles of the earth of the first piezoelectric vibrator, is passed through
First pre-tightens sealing structure, is connected with control operational part；
In second mounting hole of the second piezoelectric vibrator insertion second boss, and directly connect with second boss by couplant
Touching, the second preload sealing structure provides pretightning force for the first piezoelectric vibrator, ensures to position, while being sealed to prevent the second pressure
Media contact except electric tachometer indicator and the second exciting source；Second exciting source lead is drawn from the two poles of the earth of the second piezoelectric vibrator, is passed through
Second pre-tightens sealing structure, is connected with control operational part；
The control operational part provides excitation electric signal with second piezoelectric vibrator for first piezoelectric vibrator and docks
It receives electric signal to be handled, fluid flow in run of designing.
2. the embedded broad beam ultrasonic liquid flow measurement device of a kind of piezoelectric vibrator according to claim 1, feature
Be: the pipeline section both ends have pipe screw thread, are connected in pipeline to be measured by pipe screw thread.
3. the embedded broad beam ultrasonic liquid flow measurement device of a kind of piezoelectric vibrator according to claim 1, feature
Be: the pipeline section both ends have flange arrangement, through flanged joint into pipeline to be measured.
4. the embedded broad beam ultrasonic liquid flow measurement device of a kind of piezoelectric vibrator according to claim 2 or 3, special
Sign is: juncture area and first back wave and pipe of the position of first truncation surface between incidence wave and pipeline section outside wall surface
Between the juncture area of wall outside wall surface.
5. the embedded broad beam ultrasonic liquid flow measurement device of a kind of piezoelectric vibrator according to claim 2 or 3, special
Sign is: it includes the first back-cover, the first spring, the first top cover, first seal and first that described first, which pre-tightens sealing structure,
Sealant, the first top cover are connect by screw thread or fastening screw with first boss, and the first back described in the first spring compression is passed through
Lid, the first back-cover compress the first piezoelectric vibrator, and first seal is placed between the first top cover and first boss, the first sealant pair
The aperture of first top cover is sealed.
6. the embedded broad beam ultrasonic liquid flow measurement device of a kind of piezoelectric vibrator according to claim 2 or 3, special
Sign is: it includes the second back-cover, second spring, the second top cover, second seal and second that described second, which pre-tightens sealing structure,
Sealant, the second top cover are connect by screw thread or fastening screw with second boss, compress the second back-cover by second spring, the
Two back-covers compress the second piezoelectric vibrator, and second seal is placed between the second top cover and second boss, and the second sealant is to second
The aperture of top cover is sealed.
7. the embedded broad beam ultrasonic liquid flow measurement device of a kind of piezoelectric vibrator according to claim 2 or 3, special
Sign is: it is the first casting glue that described first, which pre-tightens sealing structure, and second pre-tightens sealing structure as the second casting glue.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111089628A (en) * | 2020-01-13 | 2020-05-01 | 泰安轻松表计有限公司 | A large-diameter plastic case ultrasonic water meter and its testing method |
| CN114413984A (en) * | 2022-03-31 | 2022-04-29 | 青岛鼎信通讯股份有限公司 | Ultrasonic water meter |
| US11841336B2 (en) | 2021-01-15 | 2023-12-12 | Te Connectivity Solutions Gmbh | Bubble detection sensor |
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