CN109141556B - Piezoelectric vibrator embedded type wide-beam ultrasonic liquid flow measuring device - Google Patents
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- CN109141556B CN109141556B CN201811010443.3A CN201811010443A CN109141556B CN 109141556 B CN109141556 B CN 109141556B CN 201811010443 A CN201811010443 A CN 201811010443A CN 109141556 B CN109141556 B CN 109141556B
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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
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Abstract
The invention relates to a piezoelectric vibrator embedded type wide-beam ultrasonic liquid flow measuring device which comprises a pipe section, a first excitation source, a second excitation source and a control operation part, wherein the excitation source consists of a boss, a piezoelectric vibrator, a pre-tightening sealing structure and an excitation source lead; the boss and the pipe section are of an integral structure, and no section or other media exist between the boss and the pipe section; the piezoelectric vibrator is directly contacted with the boss through a coupling agent, the pre-tightening sealing structure provides pre-tightening force for the piezoelectric vibrator and ensures sealing, and the control operation part provides an excitation electric signal for the piezoelectric vibrator and processes a received signal to obtain the flow rate of fluid in the pipe section. The device has the advantages that the excitation source has simple and compact structure and low processing cost, does not contact with fluid and does not cause interference to a flow field; the piezoelectric vibrator is tightly attached to the pipe wall through a coupling agent, and a matching layer is not formed, so that the energy transfer efficiency is improved; the excitation source drives the pipe wall to vibrate to form a large emitting surface, and the pipe has certain capacity of resisting bubbles and solid impurity interference.
Description
Technical Field
The invention relates to an ultrasonic flow measuring device, in particular to a piezoelectric vibrator embedded type wide-beam ultrasonic liquid flow measuring device.
Background
An ultrasonic flow meter measures flow by observing ultrasonic waves that are affected by a fluid and reflect the flow velocity of the fluid. The "time difference method" is a common measurement principle, when a fluid to be measured in a pipeline flows, an actual propagation speed of ultrasonic waves generated by a transducer at a transmitting end in a process of passing through a medium can be regarded as a vector superposition of a sound speed in a static fluid and a fluid flow speed. Therefore, for the same path, the propagation time of the sound waves under the conditions of forward flow and reverse flow is different, and the flow velocity of the fluid to be measured can be solved by accurately measuring the transit time of the forward flow and the reverse flow so as to obtain the flow.
Chinese patent publication No. CN106153132A, published 2016, 11, 23, entitled L amb wave-based non-contact fluid flow measurement system and method, discloses a non-contact fluid flow measurement system, which uses a special transducer to excite a pipe wall to resonate, and generates L amb waves in a larger pipe wall area to measure the flow velocity of fluid in a pipe, and the measurement mode has certain interference immunity to bubble impurities and the like, is convenient to install, and has the disadvantages of low energy transfer efficiency and poor signal-to-noise ratio of a transducer system which is arranged outside a pipeline and has a working surface not in contact with the measured pipeline.
Compared with an invasive or inserted ultrasonic flow measuring device, sound waves of the external clamping type device are usually transmitted for a long distance in a pipe wall, but the external clamping type device is greatly influenced by the pipe condition, and sound wave signals are usually greatly lost; the transducer of the intrusive type ultrasonic flow measuring device is in direct contact with fluid, signal loss is small, but the fluid flow field state around the transducer is complex, interference on sound wave signals cannot be ignored, and in addition, the action range of sound beams is relatively small and is easily influenced by bubbles, impurity particles and the like. The invention discloses an ultrasonic flow measuring device which comprehensively considers the advantages and the disadvantages of an external clamping type ultrasonic device and an invasive type ultrasonic device and is designed in a non-contact mode and small in acoustic wave signal loss.
Disclosure of Invention
The present invention aims to solve the following problems:
(1) the existing external-clamping ultrasonic flow measuring device needs cleaning and descaling and repeated installation and positioning before measurement, the measurement preparation work is complex and tedious, and signals are easily influenced by the condition of a measuring pipeline;
(2) the transducer of the existing invasive pipe section ultrasonic flow measuring device is directly contacted with a flow field, which causes certain interference to the flow field and has requirements on the properties of the fluid to be measured;
(3) the existing intrusive ultrasonic flowmeter sound wave signals are easily influenced by bubbles and foreign particles in a measuring medium, so that received signals are attenuated.
A piezoelectric vibrator embedded type wide-beam ultrasonic liquid flow measuring device comprises a pipe section, a first excitation source, a second excitation source and a control operation part;
the first excitation source comprises a first boss, a first piezoelectric vibrator, a first pre-tightening sealing structure and a first excitation source lead; the second excitation source comprises a second boss, a second piezoelectric vibrator, a second pre-tightening sealing structure and a second excitation source lead;
the first excitation source and the second excitation source are positioned on different sides of the pipe section, and the second piezoelectric vibrator of the second excitation source is positioned on the opposite side of the first piezoelectric vibrator of the first excitation source and the central lines of the first and second piezoelectric vibrators are parallel;
the first boss and the pipe section are of an integral structure, no section or other medium exists between the first boss and the pipe section, and the first boss is provided with a first section and a first mounting hole; the second boss and the pipe section are of an integral structure, no fracture surface or other media exists between the second boss and the pipe section, and the second boss is provided with a second fracture surface and a second mounting hole;
the first piezoelectric vibrator is embedded into a first mounting hole of the first boss and directly contacts with the first boss through a coupling agent, the first pre-tightening sealing structure provides pre-tightening force for the first piezoelectric vibrator, ensures positioning and simultaneously seals to prevent the first piezoelectric vibrator from contacting with a medium except a first excitation source; the first excitation source lead is led out from two poles of the first piezoelectric vibrator, penetrates through the first pre-tightening sealing structure and is connected with the control operation part;
the second piezoelectric vibrator is embedded into a second mounting hole of the second boss and directly contacts with the second boss through a coupling agent, and the second pre-tightening sealing structure provides pre-tightening force for the first piezoelectric vibrator, ensures positioning and simultaneously seals to prevent the second piezoelectric vibrator from contacting with a medium except a second excitation source; a second excitation source lead is led out from two poles of the second piezoelectric vibrator, penetrates through the second pre-tightening sealing structure and is connected with the control operation part;
the control operation part provides an excitation electric signal for the first piezoelectric vibrator and the second piezoelectric vibrator, processes a received electric signal and calculates the flow rate of fluid in the pipe section.
Optionally, two ends of the pipe section are provided with pipe threads, and the pipe section is connected to a pipeline to be tested through the pipe threads.
Optionally, two ends of the pipe section are provided with flange structures, and the pipe section is connected to a pipeline to be tested through flanges.
Optionally, the position of the first section surface is between a boundary region between the incident wave and the outer wall surface of the pipe segment and a boundary region between the first reflected wave and the outer wall surface of the pipe wall.
Optionally, the first pre-tightening sealing structure comprises a first back cover, a first spring, a first top cover, a first sealing element and first sealant, the first top cover is connected with the first boss through threads or fastening screws, the first back cover is pressed through the first spring, the first back cover presses the first piezoelectric vibrator, the first sealing element is arranged between the first top cover and the first boss, and the first sealant seals an opening of the first top cover.
Optionally, the second pre-tightening sealing structure comprises a second back cover, a second spring, a second top cover, a second sealing element and second sealant, the second top cover is connected with the second boss through threads or fastening screws, the second back cover is pressed through the second spring, the second back cover presses the second piezoelectric vibrator, the second sealing element is arranged between the second top cover and the second boss, and the second sealant seals the open hole of the second top cover.
Optionally, the first pre-tightening sealing structure is a first potting adhesive, and the second pre-tightening sealing structure is a second potting adhesive.
The invention has the beneficial effects that: the piezoelectric vibrator in the piezoelectric vibrator embedded type wide-beam ultrasonic liquid flow measuring device is directly contacted with a pipe wall material through a coupling agent, and a matching layer is not arranged at the front end of the piezoelectric vibrator, so that energy dissipation is reduced, and energy transfer efficiency is improved; the excitation source has simple structure, low processing and manufacturing cost and better reliability; the excitation source is not in contact with the flow field, so that the flow field is not interfered; the excitation source drives the pipe wall to vibrate to form a larger emitting surface, and the pipe has certain capacity of resisting bubbles and solid impurity interference.
Drawings
FIG. 1 is a schematic cross-sectional view of a first embodiment;
FIG. 2 is a schematic illustration of the position of a first cross-sectional plane in a first embodiment;
FIG. 3 is a schematic cross-sectional view of a second embodiment;
FIG. 4 is a schematic sectional view of a third embodiment;
Detailed Description
The first embodiment is as follows: the present embodiment is described with reference to fig. 1, and a piezoelectric vibrator embedded type broad beam ultrasonic liquid flow rate measurement device includes a pipe segment 1, a first excitation source 2, a second excitation source 3, and a control calculation unit.
The pipe segment 1 includes a first pipe segment 101, a second pipe segment 102, and a third pipe segment 103. The first pipe section 101 and the third pipe section 103 are provided with pipe threads and are connected into a pipeline to be tested through the pipe threads; the second spool piece 102 is a fluid measurement spool piece.
The first excitation source 2 comprises a first boss 201, a first piezoelectric vibrator 202, a first organic glass back cover 203, a first sealing element 204, a first spring 205, a first threaded top cover 206, a first glue sealing port 207 and a first excitation source lead 208; the second excitation source 3 includes a second boss 301, a second piezoelectric vibrator 302, a second plexiglas back cover 303, a second sealing member 304, a second spring 305, a second threaded top cover 306, a second glue sealing port 307, and a second excitation source lead 308. The first boss 201 and the pipe section 1 are of an integral structure, and no fracture surface or other medium exists between the first boss and the pipe section; the second boss 301 and the pipe section 1 are also of an integral structure, and no fracture surface or other media exists between the second boss and the pipe section; the first boss 201, the second boss 301 and the pipe segment 1 are made of 304 stainless steel.
The first excitation source 2 and the second excitation source 3 have the same structure, and the first excitation source 2 is taken as an example for characteristic description. The back of the first piezoelectric vibrator 202 is embedded into the first organic glass back cover 203, the front end of the first piezoelectric vibrator 202 protrudes out of the surface of the first organic glass back cover 203, a combined body formed by the first piezoelectric vibrator 202 and the first organic glass back cover 203 is embedded into a first mounting hole of the first boss 201, and the front end of the first piezoelectric vibrator 202 is directly contacted with the first boss 201 through a coupling agent, so that the primary mounting and positioning of the first piezoelectric vibrator 202 are ensured; the first threaded top cover 206 is connected with the first boss 201 through threads, and presses the first organic glass back cover 203 from the back with the first spring 205 so as to provide pre-tightening force for the first piezoelectric vibrator 202; a first excitation source lead 208 is led out from two poles of the first piezoelectric vibrator 202, sequentially passes through a through hole in the first organic glass back cover 203, the first spring 205 and the first glue sealing port 207 in the first threaded top cover 206, and is finally connected to the control operation part; a first sealing element 204 is arranged between the first threaded top cover 206 and the first boss 201 to ensure the sealing of the connecting thread; after the relevant parts of the first excitation source 2 are mounted, epoxy glue is poured from the first glue sealing opening 207 to ensure the sealing of the first excitation source lead 208.
The broad beam operation mechanism in the piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device is described with reference to fig. 1 and fig. 2. An excitation voltage signal generated by the control operation part acts on the first piezoelectric vibrator 202 through the first excitation source lead 208, the first piezoelectric vibrator 202 is forced to vibrate, the first boss 201 is driven to vibrate through the coupling agent, and the vibration is transmitted in a solid wave mode; the incident wave 501 is transmitted to the inner pipe wall 104 to be reflected and refracted, the generated first refracted beam 401 passes through the fluid and is transmitted to the second piezoelectric vibrator 302, the generated first reflected wave 502 is continuously transmitted along the pipe wall direction, the reflection and the refraction are generated at the outer pipe wall 105, the formed refracted wave is transmitted to the air, and the formed reflected wave is continuously transmitted forwards and is continuously reflected and refracted. In fig. 1, the first refracted beam 401 is a first sound wave incident into the fluid, and the second refracted beam 402 and the third refracted beam 403 are a second sound wave and a third sound wave entering into the fluid, respectively, so that the coverage of the sound waves is wide, and even if a certain amount of bubbles and solid particles are contained in the fluid, part of sound wave signals can be smoothly received by the receiving piezoelectric vibrator, thereby improving the anti-interference performance.
To ensure the quality of the acoustic signal received by the second piezoelectric transducer 302, it is necessary that most of the acoustic wave generated by the first piezoelectric transducer 202 be reflected by the wall of the second pipe segment 102 and enter the fluid region within the pipe segment. As shown in fig. 2, the first cross-sectional surface 210 is disposed between a boundary region between the incident wave 501 and the outer tube wall 105 and a boundary region between the first reflected wave 502 and the outer tube wall 105, i.e., within a dotted line interval in the figure. In this way, the first reflected wave 502 may be completely reflected by the outer tube wall 105 while avoiding interference of the first cut-off surface 210 with the incident wave 501.
The fluid flow rate is calculated by adopting a time difference method principle according to the measured forward and backward flow time difference, and the flow rate is calculated according to the following formula ⑴:
obtaining:
wherein d is the inner diameter of the pipeline, Δ t is the forward and reverse flow time difference, v is the flow velocity of the fluid to be measured, c is the sound velocity in the fluid, and θ is the refraction angle of the sound beam in the fluid, the total flow expression is ⑵:
wherein k is the correction factor, a is the cross-sectional area of the pipe, and Q is the total flow.
The second embodiment is as follows: referring to fig. 3, the first embodiment is different from the first embodiment in that the pipe segment 1 includes a first flange 106, a second flange 107, and a second pipe segment 102, and the pipe segment 1 is connected to the measurement pipeline through the first flange 106 and the second flange 107.
The third concrete implementation mode: the present embodiment is described with reference to fig. 4, and the difference between the present embodiment and the first embodiment is that the first excitation source 2 includes a first boss 201, a first piezoelectric vibrator 202, a first excitation source lead 208, and a first potting adhesive 209, and the second excitation source 3 includes a second boss 301, a second piezoelectric vibrator 302, a second excitation source lead 308, and a second potting adhesive 309; in order to ensure that the potting adhesive provides a certain pretightening force, the potting adhesive is arranged in the pressure cavity during curing, and constant-temperature and constant-pressure curing is ensured.
Claims (7)
1. A piezoelectric vibrator embedded type wide-beam ultrasonic liquid flow measuring device comprises a pipe section, a first excitation source, a second excitation source and a control operation part;
the method is characterized in that: the first excitation source comprises a first boss, a first piezoelectric vibrator, a first pre-tightening sealing structure and a first excitation source lead; the second excitation source comprises a second boss, a second piezoelectric vibrator, a second pre-tightening sealing structure and a second excitation source lead;
the first excitation source and the second excitation source are positioned on different sides of the pipe section, and the second piezoelectric vibrator of the second excitation source is positioned on the opposite side of the first piezoelectric vibrator of the first excitation source and the central lines of the first and second piezoelectric vibrators are parallel;
the first boss and the pipe section are of an integral structure, no section or other medium exists between the first boss and the pipe section, and the first boss is provided with a first section and a first mounting hole; the second boss and the pipe section are of an integral structure, no fracture surface or other media exists between the second boss and the pipe section, and the second boss is provided with a second fracture surface and a second mounting hole;
the first piezoelectric vibrator is embedded into a first mounting hole of the first boss and directly contacts with the first boss through a coupling agent, the first pre-tightening sealing structure provides pre-tightening force for the first piezoelectric vibrator, ensures positioning and simultaneously seals to prevent the first piezoelectric vibrator from contacting with a medium except a first excitation source; the first excitation source lead is led out from two poles of the first piezoelectric vibrator, penetrates through the first pre-tightening sealing structure and is connected with the control operation part;
the second piezoelectric vibrator is embedded into a second mounting hole of the second boss and directly contacts with the second boss through a coupling agent, and the second pre-tightening sealing structure provides pre-tightening force for the first piezoelectric vibrator, ensures positioning and simultaneously seals to prevent the second piezoelectric vibrator from contacting with a medium except a second excitation source; a second excitation source lead is led out from two poles of the second piezoelectric vibrator, penetrates through the second pre-tightening sealing structure and is connected with the control operation part;
the control operation part provides an excitation electric signal for the first piezoelectric vibrator and the second piezoelectric vibrator, processes a received electric signal and calculates the flow rate of fluid in the pipe section.
2. The piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device according to claim 1, characterized in that: and pipe threads are arranged at two ends of the pipe section and are connected into a pipeline to be tested through the pipe threads.
3. The piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device according to claim 1, characterized in that: and two ends of the pipe section are provided with flange structures and are connected to a pipeline to be tested through flanges.
4. The piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device according to claim 2 or 3, characterized in that: the position of the first section surface is between the boundary area of the incident wave and the outer wall surface of the pipe section and the boundary area of the first reflected wave and the outer wall surface of the pipe wall.
5. The piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device according to claim 2 or 3, characterized in that: the first pre-tightening sealing structure comprises a first back cover, a first spring, a first top cover, a first sealing element and first sealing glue, the first top cover is connected with a first boss through threads or fastening screws, the first back cover is pressed through the first spring, the first back cover presses a first piezoelectric vibrator, the first sealing element is arranged between the first top cover and the first boss, and the first sealing glue seals a hole of the first top cover.
6. The piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device according to claim 2 or 3, characterized in that: the second pre-tightening sealing structure comprises a second back cover, a second spring, a second top cover, a second sealing element and second sealing glue, the second top cover is connected with the second boss through threads or fastening screws, the second back cover is tightly pressed through the second spring, the second back cover tightly presses the second piezoelectric vibrator, the second sealing element is arranged between the second top cover and the second boss, and the second sealing glue seals a hole of the second top cover.
7. The piezoelectric vibrator embedded type broad beam ultrasonic liquid flow measuring device according to claim 2 or 3, characterized in that: the first pre-tightening sealing structure is first pouring sealant, and the second pre-tightening sealing structure is second pouring sealant.
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| US11841336B2 (en) | 2021-01-15 | 2023-12-12 | Te Connectivity Solutions Gmbh | Bubble detection sensor |
| CN114413984A (en) * | 2022-03-31 | 2022-04-29 | 青岛鼎信通讯股份有限公司 | Ultrasonic water meter |
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| JPS5516253A (en) * | 1978-07-21 | 1980-02-04 | Tokyo Keiki Co Ltd | Pulse system ultrasonic-wave doppler current meter |
| JP2002535639A (en) * | 1999-01-22 | 2002-10-22 | パナメトリクス・インコーポレイテッド | Clamp-on gas flow meter |
| CN1648614A (en) * | 2004-01-30 | 2005-08-03 | 富士电机系统株式会社 | Wedge and wedge unit for use in ultrasonic doppler flow meter |
| CN202092695U (en) * | 2011-06-07 | 2011-12-28 | 王秀枝 | External-clamping ultrasonic sensor |
| CN203178001U (en) * | 2013-04-23 | 2013-09-04 | 山东精精仪表有限公司 | Supersonic-wave heat meter |
| CN104335015A (en) * | 2012-06-05 | 2015-02-04 | 松下知识产权经营株式会社 | Ultrasound flow quantity measurement unit and method for manufacturing same |
| CN204575153U (en) * | 2015-04-29 | 2015-08-19 | 韩小明 | A kind of high-precision ultrasonic water meter |
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2018
- 2018-08-31 CN CN201811010443.3A patent/CN109141556B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5516253A (en) * | 1978-07-21 | 1980-02-04 | Tokyo Keiki Co Ltd | Pulse system ultrasonic-wave doppler current meter |
| JP2002535639A (en) * | 1999-01-22 | 2002-10-22 | パナメトリクス・インコーポレイテッド | Clamp-on gas flow meter |
| CN1648614A (en) * | 2004-01-30 | 2005-08-03 | 富士电机系统株式会社 | Wedge and wedge unit for use in ultrasonic doppler flow meter |
| CN202092695U (en) * | 2011-06-07 | 2011-12-28 | 王秀枝 | External-clamping ultrasonic sensor |
| CN104335015A (en) * | 2012-06-05 | 2015-02-04 | 松下知识产权经营株式会社 | Ultrasound flow quantity measurement unit and method for manufacturing same |
| CN203178001U (en) * | 2013-04-23 | 2013-09-04 | 山东精精仪表有限公司 | Supersonic-wave heat meter |
| CN204575153U (en) * | 2015-04-29 | 2015-08-19 | 韩小明 | A kind of high-precision ultrasonic water meter |
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