CN114235112A - Flow field monitoring device applied to ultrasonic water meter - Google Patents
Flow field monitoring device applied to ultrasonic water meter Download PDFInfo
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- CN114235112A CN114235112A CN202210183160.9A CN202210183160A CN114235112A CN 114235112 A CN114235112 A CN 114235112A CN 202210183160 A CN202210183160 A CN 202210183160A CN 114235112 A CN114235112 A CN 114235112A
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Abstract
The invention relates to the technical field of ultrasonic water meters and discloses a flow field monitoring device applied to an ultrasonic water meter.A first ultrasonic signal emitted by a first transducer is divided into two paths after passing through a first polyethylene laminated plate, one path of ultrasonic signal reaches a second transducer after being reflected by the first polyethylene laminated plate, reflected by a second reflector and reflected by a second polyethylene laminated plate, and the other path of ultrasonic signal reaches the second transducer after being transmitted by the first polyethylene laminated plate, reflected by the first reflector, reflected by the second reflector, reflected by a third reflector and transmitted by the second polyethylene laminated plate; vice versa, the second transducer emits an ultrasonic signal that reaches the first transducer via the same reflection, transmission. The characteristic that ultrasonic waves are sensitive to the flow field is utilized, the flow field in the pipeline is monitored by analyzing the difference value between the time of an ultrasonic signal from the upstream transducer to the downstream transducer and the time of the ultrasonic signal from the downstream transducer to the upstream transducer, the device saves cost, is simple to operate and has high working efficiency.
Description
Technical Field
The invention relates to the technical field of ultrasonic water meters, in particular to a flow field monitoring device applied to an ultrasonic water meter.
Background
In the calibration process of the ultrasonic water meter, the flow field stability of the calibration device is a basic premise, so that the monitoring of the flow field is indispensable.
The conventional device capable of monitoring the flow field in the market is a Particle Image Velocimetry (PIV) system, which has the disadvantages of high cost, complex operation and low efficiency, so that a simple and effective device is urgently needed in the field of current ultrasonic water meter verification to realize real-time monitoring of the flow field.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a flow field monitoring device applied to an ultrasonic water meter, and realizes the monitoring of a flow field based on an ultrasonic technology.
The purpose of the invention can be realized by the following technical scheme:
a flow field monitoring device applied to an ultrasonic water meter comprises an ultrasonic monitoring system and an acoustic path system;
the ultrasonic monitoring system comprises a pair of transducers and a signal acquisition circuit;
the sound path system comprises three reflectors, two polyethylene laminated plates for reflecting and transmitting ultrasonic waves, a pipeline and two brackets;
the connection relationship is as follows: the first transducer and the second transducer are embedded in the inner wall of the pipeline and distributed at the upstream and downstream of the pipeline, and a connecting line between the central points of the two transducers along the pipeline wall is a straight line; the signal acquisition circuit is connected with the first transducer and the second transducer through leads; the second reflector is embedded in the inner wall of the pipeline and is positioned at the midpoint of a connecting line between the central points of the two transducers along the pipeline wall; the first support is arranged on the inner wall of the pipeline through integral injection molding, the first polyethylene laminated plate and the first reflector are fixed on the first support in the pipeline, and the centers of the first polyethylene laminated plate and the first reflector are aligned right below the first transducer; the second support is arranged on the inner wall of the pipeline through integral injection molding, and the second polyethylene laminated plate and the third reflector are fixed on the second support in the pipeline and aligned with the center right below the second transducer; one end of the first reflector and one end of the third reflector contact the inner wall of the pipeline; the mirror surface center points of the first polyethylene laminated plate and the second polyethylene laminated plate are positioned on the axis of the pipeline.
Furthermore, ultrasonic signals emitted by the first transducer are divided into two paths after passing through the first polyethylene laminated plate, one path of ultrasonic signals reach the second transducer after being reflected by the first polyethylene laminated plate, reflected by the second reflector and reflected by the second polyethylene laminated plate, and the other path of ultrasonic signals reach the second transducer after being transmitted by the first polyethylene laminated plate, reflected by the first reflector, reflected by the second reflector, reflected by the third reflector and transmitted by the second polyethylene laminated plate;
ultrasonic signals transmitted by the second transducer are divided into two paths after passing through the second polyethylene laminated plate, one path of ultrasonic signals reach the first transducer after being reflected by the second polyethylene laminated plate, reflected by the second reflector and reflected by the first polyethylene laminated plate, and the other path of ultrasonic signals reach the first transducer after being transmitted by the second polyethylene laminated plate, reflected by the third reflector, reflected by the second reflector, reflected by the first reflector and transmitted by the first polyethylene laminated plate.
Furthermore, the included angle between the first polyethylene laminated plate and the second polyethylene laminated plate and the axis of the pipeline is (90-arctan (D/L))/2, the included angle between the first reflector and the third reflector and the axis of the pipeline is (90-arctan (2D/L))/2, wherein D is the distance between the centers of the two transducers, and L is the inner diameter of the pipeline.
The beneficial technical effects of the invention are as follows: the monitoring of the state of a liquid flow field in a pipeline is realized based on an ultrasonic technology; the device has simple structure and lower cost; compared with the complicated operation of the PIV system, the device is integrated in the ultrasonic water meter, directly displays the flow field monitoring result, and is simple to operate; on the basis of ensuring the accuracy of the result, the speed of obtaining the result is far faster than that of a PIV system.
Drawings
Fig. 1 is a schematic structural diagram according to an embodiment of the present invention.
Reference numerals: the device comprises a first transducer 1, a first polyethylene laminated plate 2, a second reflector 3, a second polyethylene laminated plate 4, a second transducer 5, a first reflector 6, a third reflector 7, a first support 8, a second support 9, a pipeline 10 and a signal acquisition circuit 11.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, a flow field monitoring device applied to an ultrasonic water meter includes an ultrasonic monitoring system and an acoustic path system;
the ultrasonic monitoring system comprises a pair of transducers and a signal acquisition circuit;
the sound path system comprises three reflectors, two polyethylene laminated plates for reflecting and transmitting ultrasonic waves, a pipeline and two brackets;
the connection relationship is as follows: the first transducer 1 and the second transducer 5 are embedded in the inner wall of the pipeline 10 and distributed at the upstream and downstream of the pipeline 10, and a connecting line between the central points of the two transducers along the pipeline wall is a straight line; the signal acquisition circuit 11 is connected with the first transducer 1 and the second transducer 5 through leads; the second reflector 3 is embedded in the inner wall of the pipeline 10 and is positioned at the midpoint of a connecting line between the central points of the two transducers along the pipeline wall; the first support 8 is arranged on the inner wall of the pipeline 10 through integral injection molding, the first polyethylene laminated plate 2 and the first reflector 6 are fixed on the first support 8 in the pipeline 10 and are aligned with the center right below the first transducer 1; the second bracket 9 is arranged on the inner wall of the pipeline 10 through integral injection molding, and the second polyethylene laminated plate 4 and the third reflector 7 are fixed on the second bracket 9 in the pipeline 10 and are aligned with the center right below the second transducer 5; one ends of the first reflector 6 and the third reflector 7 are contacted with the inner wall of the pipeline 10; the mirror center points of the first and second polyethylene laminated sheets 2 and 4 are located on the axis of the duct 10.
The included angle between the first polyethylene laminated plate 2 and the second polyethylene laminated plate 4 and the axis of the pipeline is (90-arctan (D/L))/2, the included angle between the first reflecting mirror 6 and the third reflecting mirror 7 and the axis of the pipeline is (90-arctan (2D/L))/2, wherein D is the distance between the centers of the two transducers, and L is the inner diameter of the pipeline.
Ultrasonic signals emitted by the first transducer 1 are divided into two paths after passing through the first polyethylene laminated plate 2, one path of ultrasonic signals reaches the second transducer 5 after being reflected by the first polyethylene laminated plate 2, the second reflector 3 and the second polyethylene laminated plate 4, and the other path of ultrasonic signals reaches the second transducer 5 after being transmitted by the first polyethylene laminated plate 2, the first reflector 6, the second reflector 3, the third reflector 7 and the second polyethylene laminated plate 4; ultrasonic signals emitted by the second transducer 5 are divided into two paths after passing through the second polyethylene laminated plate 4, one path of ultrasonic signals reaches the first transducer 1 after being reflected by the second polyethylene laminated plate 4, the second reflector 3 and the first polyethylene laminated plate 2, and the other path of ultrasonic signals reaches the first transducer after being transmitted by the second polyethylene laminated plate 4, reflected by the third reflector 7, reflected by the second reflector 3, reflected by the first reflector 6 and transmitted by the first polyethylene laminated plate 2.
Reference 1: the Xubo Hou, King Dajun 1990 published an article "a laminated plate model for calculating the reflection and transmission of sound waves" introduced a model for sound wave transmission and reflection;
reference 2: the specific calculation methods for the acoustic wave transmittance and reflectance are given in the formulas (4-10-28) on page 138 of the book "acoustical foundation" (third edition) by duchenne, huchen, goffen.
In the examples where D =15mm, L =60mm, the speed of propagation sound in polyethylene material (PE) is 2160m/s, and the material density is 0.962 g/cm, reference 1, 2, when ultrasonic waves are incident on polyethylene laminates, the calculated transmission is about 62% and the calculated reflection is about 38%, demonstrating the reflection and transmission of ultrasonic waves in polyethylene laminates.
The basic principle of the scheme is as follows: when the flow field in the pipeline is stable, the difference value between the time of the ultrasonic signal from the upstream transducer to the downstream transducer and the time of the ultrasonic signal from the downstream transducer to the upstream transducer is stable; when the flow field in the pipe is unstable, the difference between the time of the ultrasonic signal from the upstream transducer to the downstream transducer and the time of the ultrasonic signal from the downstream transducer to the upstream transducer fluctuates.
In the embodiment, a fluctuation rate threshold value of 5% is set for the difference value, the fluctuation rate of the difference value in a specified time period is measured to be 4%, and the stability of the flow field in the pipeline is judged.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.
Claims (3)
1. A flow field monitoring device applied to an ultrasonic water meter is characterized by comprising an ultrasonic monitoring system and an acoustic path system;
the ultrasonic monitoring system comprises a pair of transducers and a signal acquisition circuit;
the sound path system comprises three reflectors, two polyethylene laminated plates for reflecting and transmitting ultrasonic waves, a pipeline and two brackets;
the connection relationship is as follows: the first transducer and the second transducer are embedded in the inner wall of the pipeline and distributed at the upstream and downstream of the pipeline, and a connecting line between the central points of the two transducers along the pipeline wall is a straight line; the signal acquisition circuit is connected with the first transducer and the second transducer through leads; the second reflector is embedded in the inner wall of the pipeline and is positioned at the midpoint of a connecting line between the central points of the two transducers along the pipeline wall; the first support is arranged on the inner wall of the pipeline through integral injection molding, the first polyethylene laminated plate and the first reflector are fixed on the first support in the pipeline, and the centers of the first polyethylene laminated plate and the first reflector are aligned right below the first transducer; the second support is arranged on the inner wall of the pipeline through integral injection molding, and the second polyethylene laminated plate and the third reflector are fixed on the second support in the pipeline and aligned with the center right below the second transducer; one end of the first reflector and one end of the third reflector contact the inner wall of the pipeline; the mirror surface center points of the first polyethylene laminated plate and the second polyethylene laminated plate are positioned on the axis of the pipeline.
2. The flow field monitoring device applied to an ultrasonic water meter according to claim 1, wherein the ultrasonic signal emitted by the first transducer is divided into two paths after passing through the first polyethylene laminate, one path of the ultrasonic signal reaches the second transducer after being reflected by the first polyethylene laminate, reflected by the second reflector and reflected by the second polyethylene laminate, and the other path of the ultrasonic signal reaches the second transducer after being transmitted by the first polyethylene laminate, reflected by the first reflector, reflected by the second reflector, reflected by the third reflector and transmitted by the second polyethylene laminate;
ultrasonic signals transmitted by the second transducer are divided into two paths after passing through the second polyethylene laminated plate, one path of ultrasonic signals reach the first transducer after being reflected by the second polyethylene laminated plate, reflected by the second reflector and reflected by the first polyethylene laminated plate, and the other path of ultrasonic signals reach the first transducer after being transmitted by the second polyethylene laminated plate, reflected by the third reflector, reflected by the second reflector, reflected by the first reflector and transmitted by the first polyethylene laminated plate.
3. The flow field monitoring device of claim 1, wherein the first and second polyethylene laminates are positioned at an angle of (90 ° -arctan (D/L))/2 with respect to the axis of the pipe, and the first and third reflectors are positioned at an angle of (90 ° -arctan (2D/L))/2 with respect to the axis of the pipe, where D is the distance between the centers of the two transducers and L is the inner diameter of the pipe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210183160.9A CN114235112B (en) | 2022-02-28 | 2022-02-28 | Flow field monitoring device applied to ultrasonic water meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210183160.9A CN114235112B (en) | 2022-02-28 | 2022-02-28 | Flow field monitoring device applied to ultrasonic water meter |
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| CN114235112A true CN114235112A (en) | 2022-03-25 |
| CN114235112B CN114235112B (en) | 2022-05-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991009282A1 (en) * | 1989-12-15 | 1991-06-27 | Siemens Aktiengesellschaft | Ultrasonic gas/liquid flow meter |
| US5351560A (en) * | 1989-12-15 | 1994-10-04 | Siemens Aktiengesellschaft | Ultrasonic flow meter |
| CN102494724A (en) * | 2011-12-07 | 2012-06-13 | 广州柏诚智能科技有限公司 | Ultrasonic flowmeter and flow tube for same |
| CN103323064A (en) * | 2013-05-31 | 2013-09-25 | 合肥瑞纳表计有限公司 | Ultrasonic multi-point reflection flow meter |
| CN103842779A (en) * | 2011-07-15 | 2014-06-04 | 恩德斯+豪斯流量技术股份有限公司 | Ultrasonic flow meter |
-
2022
- 2022-02-28 CN CN202210183160.9A patent/CN114235112B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991009282A1 (en) * | 1989-12-15 | 1991-06-27 | Siemens Aktiengesellschaft | Ultrasonic gas/liquid flow meter |
| US5351560A (en) * | 1989-12-15 | 1994-10-04 | Siemens Aktiengesellschaft | Ultrasonic flow meter |
| CN103842779A (en) * | 2011-07-15 | 2014-06-04 | 恩德斯+豪斯流量技术股份有限公司 | Ultrasonic flow meter |
| CN102494724A (en) * | 2011-12-07 | 2012-06-13 | 广州柏诚智能科技有限公司 | Ultrasonic flowmeter and flow tube for same |
| CN103323064A (en) * | 2013-05-31 | 2013-09-25 | 合肥瑞纳表计有限公司 | Ultrasonic multi-point reflection flow meter |
Non-Patent Citations (3)
| Title |
|---|
| FACHUN LIANG: "Identification of gas-liquid two-phase flow patterns in a horizontal pipe based on ultrasonic echoes and RBF neural network", 《FLOW MEASUREMENT AND INSTRUMENTATION》 * |
| LIDE FANG: "Development of a high-precision and wide-range ultrasonic water meter", 《FLOW MEASUREMENT AND INSTRUMENTATION》 * |
| 孙凌逸: "基于经验模态分解的超声波管外测压信号去噪", 《声学技术》 * |
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