CN107490411B - Ultrasonic measurement pipe section structure for ultrasonic flowmeter - Google Patents
Ultrasonic measurement pipe section structure for ultrasonic flowmeter Download PDFInfo
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- CN107490411B CN107490411B CN201710732548.9A CN201710732548A CN107490411B CN 107490411 B CN107490411 B CN 107490411B CN 201710732548 A CN201710732548 A CN 201710732548A CN 107490411 B CN107490411 B CN 107490411B
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- cylinder
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- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 230000004323 axial length Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 8
- 230000000737 periodic effect Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000005534 acoustic noise Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention relates to an ultrasonic measurement tube section structure for an ultrasonic flowmeter, which comprises a measurement tube and two transducers, wherein the two transducers are symmetrically arranged in mounting seats made on two sides of the upper end of the measurement tube, and a reflection cylinder is embedded on the inner wall of the measurement tube below the two mounting seats; the technical characteristics are that: the rectifying mechanism is fixedly arranged on the reflecting cylinder at the inlet side and consists of a cylinder sleeve and a rectifying plate which are integrally manufactured, the cylinder sleeve is sleeved on the reflecting cylinder, and the rectifying plate is axially arranged on the inner wall of the measuring tube right behind the cylinder sleeve. The invention can effectively inhibit the vortex shedding in the wake, thereby realizing the stability of the flow field, reducing the pressure loss and reducing the generation of sound noise.
Description
Technical Field
The invention belongs to the technical field of ultrasonic flow meters, relates to an ultrasonic measurement pipe section structure, and in particular relates to an ultrasonic measurement pipe section structure for an ultrasonic flow meter.
Background
Currently, ultrasonic measurement pipe segments are widely used in ultrasonic flow meters. The existing pipe section structure for ultrasonic measurement comprises a measuring pipe, a transducer and a reflecting cylinder; the transducer is embedded at the upper end of the measuring tube, and the flow between the two reflecting columns is measured by utilizing ultrasonic waves.
Because the formation of vortex street in the reflective cylindrical wake cannot be restrained when the flow of the pipe section is measured by utilizing the ultrasonic waves in the prior art, the flow field is unstable due to the cylindrical vortex phenomenon, and the detection precision is reduced. In addition, the vortex shedding at two sides of the object alternately can cause the increase of the fluid resistance, and can cause the bad effects of vibration, noise and the like to influence the normal signal acquisition, thereby influencing the metering accuracy.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an ultrasonic measurement tube section structure for an ultrasonic flowmeter, which can effectively inhibit vortex street formation in wake, has stable flow field, small noise and high detection precision.
The invention solves the technical problems by adopting the following technical scheme:
an ultrasonic measuring tube section structure for an ultrasonic flowmeter comprises a measuring tube and two transducers, wherein the two transducers are symmetrically arranged in mounting seats formed on two sides of the upper end of the measuring tube, and a reflecting cylinder is embedded on the inner wall of the measuring tube below the two mounting seats; the method is characterized in that: the rectifying mechanism is fixedly arranged on the reflecting cylinder at the inlet side and consists of a cylinder sleeve and a rectifying plate which are integrally manufactured, the cylinder sleeve is sleeved on the reflecting cylinder, and the rectifying plate is axially arranged on the inner wall of the measuring tube right behind the cylinder sleeve.
Moreover, the mounting mode of the cylindrical sleeve and the reflecting cylinder is as follows: two guide grooves are symmetrically arranged on the outer surface of the reflecting cylinder along the axial direction, two limit posts are arranged at corresponding positions on the inner wall of the cylinder sleeve, and the two limit posts on the cylinder sleeve are embedded in the two guide grooves on the reflecting cylinder.
Moreover, the diameter of the reflecting cylinder is phi 8 mm-phi 15mm, and the axial length of the fairing along the measuring tube is 6mm-20mm.
And the lower end of the rectifying piece is embedded in a groove formed in the inner wall of the measuring tube.
The invention has the advantages and positive effects that:
1. according to the invention, the rectifying mechanism is additionally arranged on the reflecting cylinder, and experiments show that the vortex shedding in the trail can be effectively inhibited; the rectifying mechanism is composed of a cylindrical sleeve and a rectifying piece which are integrally manufactured, the cylindrical sleeve can be sleeved on the reflecting cylinder, the rectifying piece is axially arranged on the inner wall of the measuring tube at the right rear of the cylindrical sleeve, the axial length of the rectifying piece is 6-20 mm, and the rectifying piece can effectively inhibit vortex shedding in a wake, so that the stability of a flow field is realized, and the pressure loss is reduced. In addition, the generation of acoustic noise can be reduced.
2. The invention is provided with two guide grooves which are symmetrical on the left and right sides along the axial direction on the outer surface of the reflecting cylinder, and two limit posts are arranged at the corresponding positions on the inner wall of the cylinder sleeve; the cylinder sleeve and the rectifying piece realize the limit of the circumferential direction through two guide grooves on the reflecting cylinder, and the axial positioning of the reflecting cylinder is realized through the limit column. The installation mode is reliable in positioning and unique, and consistency of production products can be guaranteed.
3. The invention is mainly used for an ultrasonic column type measuring tube section of DN15-DN50 (DN 15/DN20/DN25/DN32/DN40/DN 50), not only maintains the function of a common column type (reflecting column type) ultrasonic measuring tube section, but also can realize the formation of a vortex street for inhibiting the column from flowing around, thereby improving the monitoring precision.
4. The lower end of the rectifying piece is embedded in the groove formed in the inner wall of the measuring tube, so that the stability of the rectifying piece in high-flow-rate detection is improved, the detection precision is ensured, and the service life of the rectifying mechanism is prolonged.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a cross-sectional view of FIG. 1;
FIG. 3 is a schematic view of the structure of the reflective cylinder of the present invention;
FIG. 4 is a cross-sectional view of FIG. 3;
FIG. 5 is a schematic diagram of the rectifying mechanism of the present invention;
fig. 6 is a cross-sectional view of fig. 5.
Detailed Description
Embodiments of the invention are described in further detail below with reference to the attached drawing figures:
an ultrasonic measuring tube section structure for an ultrasonic flowmeter is shown in fig. 1 to 6, and comprises a measuring tube 1 and two transducers (not marked in the figures), wherein the two transducers are symmetrically arranged in mounting seats 2 formed on two sides of the upper end of the measuring tube, and a reflecting cylinder 5 is embedded in the inner wall of the measuring tube below the two mounting seats; the method is characterized in that: the rectifying mechanism 3 is fixedly arranged on the reflecting cylinder at the inlet side and consists of a cylinder sleeve 3-1 and a rectifying plate 3-2 which are integrally manufactured, the cylinder sleeve is sleeved on the reflecting cylinder, and the rectifying plate is axially arranged on the inner wall of the measuring tube right behind the cylinder sleeve.
In this embodiment, the mounting manner of the cylindrical sleeve and the reflective cylinder is as follows: two guide grooves 5-1 are symmetrically arranged on the outer surface of the reflecting cylinder along the axial direction, two limit posts 3-1-1 are arranged on the corresponding positions on the inner wall of the cylinder sleeve, and the two limit posts on the cylinder sleeve are embedded in the two guide grooves on the reflecting cylinder.
In this embodiment, the diameter of the reflecting cylinder is phi 8 mm-phi 15mm, and the axial length of the fairing along the measuring tube is 6mm-20mm.
When the diameter of the reflecting cylinder is phi 10mm and the axial length of the measuring tube is 12mm, the fairing can be applied to ultrasonic column type measuring tube sections of DN 20.
In this embodiment, the lower end of the fairing is embedded in a recess 4 made in the inner wall of the measuring tube.
The working principle of the invention is as follows:
1. the viscous incompressible fluid can present various flowing states around the reflecting cylinder due to the fact that the fluid flows along with the increase of the Reynolds number, the flow is steady at a small Reynolds number, and a pair of wake vortices can appear behind the reflecting cylinder along with the increase of the Reynolds number. When the reynolds number is large, the wake is first destabilized, and periodic oscillations occur. Then the attached vortex alternately drops off, the effusion flows into the karman vortex street, the flow becomes more and more complex along with the increase of the Reynolds number, and finally the flow is developed into turbulent flow. The invention can effectively inhibit the formation of vortex streets in the wake, thereby realizing the stability of the flow field and being beneficial to improving the detection accuracy of the flow.
2. The means for reducing the pressure loss of the common upright post (reflecting cylinder) ultrasonic flow measurement tube section is generally realized by expanding the diameter of a measurement tube. The diameter D ∈of the flow pipe section is ∈of the flow pipe section, the water flow speed V ∈of the flow pipe section is ∈of the flow pipe section, the small flow detection difficulty ∈of the flow pipe section is ∈of the flow pipe section, the minimum flow point ∈of the flow pipe section is ∈of the flow pipe section, and the pressure loss ∈of the flow pipe section is ∈of the flow; the diameter D ∈of the flow pipe section, the water flow speed V ∈of the flow pipe section, the small flow detection difficulty ∈of the flow pipe section, the minimum flow point ∈of the flow pipe section and the pressure loss ∈of the flow pipe section; when designing such pipe sections, the pressure loss and the minimum flow point are a pair of contradictions against each other, and comprehensive consideration is needed to achieve balance. Periodic vortices are alternately generated behind the reflecting cylinder, which also causes periodic changes in pressure, increasing flow resistance. According to the invention, the rectifying mechanism is additionally arranged on the reflecting and reflecting cylinder body, so that the formation of vortex street can be effectively inhibited, the stability of a flow field is realized, the stability of the pressure at the rear end of the reflecting cylinder is realized, and the pressure loss of the measuring tube is reduced on the premise of not changing the diameter of the circulating measuring tube. The diameter of the flow measuring tube can be properly reduced under the condition of ensuring that the pressure loss is unchanged, the water flow speed is increased, the minimum flow point is reduced, and the meter can still accurately measure under the condition of small flow.
3. Periodic vortices are alternately generated behind the reflecting cylinder, which not only generates periodic changes in pressure, but also periodic acoustic noise. An interference sound source is easy to form in ultrasonic flow detection, normal signal acquisition is affected, and therefore metering accuracy is affected.
It should be emphasized that the examples described herein are illustrative rather than limiting, and therefore the invention includes not limited to the examples described in the specific embodiments, but all other embodiments which are derived by a person skilled in the art from the technical solutions of the invention are equally within the scope of the invention.
Claims (4)
1. An ultrasonic measuring tube section structure for an ultrasonic flowmeter comprises a measuring tube and two transducers, wherein the two transducers are symmetrically arranged in mounting seats formed on two sides of the upper end of the measuring tube, and a reflecting cylinder is embedded on the inner wall of the measuring tube below the two mounting seats; the method is characterized in that: the rectifying mechanism is fixedly arranged on the reflecting cylinder at the inlet side and consists of a cylinder sleeve and a rectifying plate which are integrally manufactured, the cylinder sleeve is sleeved on the reflecting cylinder, and the rectifying plate is axially arranged on the inner wall of the measuring tube right behind the cylinder sleeve.
2. An ultrasonic measurement tube segment structure for an ultrasonic flow meter according to claim 1, wherein: the mounting mode of the cylindrical sleeve and the reflecting cylinder is as follows: two guide grooves are symmetrically arranged on the outer surface of the reflecting cylinder along the axial direction, two limit posts are arranged at corresponding positions on the inner wall of the cylinder sleeve, and the two limit posts on the cylinder sleeve are embedded in the two guide grooves on the reflecting cylinder.
3. An ultrasonic measurement tube segment structure for an ultrasonic flow meter according to claim 1 or 2, wherein: the diameter of the reflecting cylinder is phi 8 mm-phi 15mm, and the axial length of the rectifying piece along the measuring tube is 6mm-20mm.
4. An ultrasonic measurement tube segment structure for an ultrasonic flow meter according to claim 1 or 2, wherein: the lower end of the rectifying piece is embedded in a groove formed in the inner wall of the measuring tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710732548.9A CN107490411B (en) | 2017-08-24 | 2017-08-24 | Ultrasonic measurement pipe section structure for ultrasonic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710732548.9A CN107490411B (en) | 2017-08-24 | 2017-08-24 | Ultrasonic measurement pipe section structure for ultrasonic flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107490411A CN107490411A (en) | 2017-12-19 |
| CN107490411B true CN107490411B (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710732548.9A Active CN107490411B (en) | 2017-08-24 | 2017-08-24 | Ultrasonic measurement pipe section structure for ultrasonic flowmeter |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1798528A1 (en) * | 2005-12-16 | 2007-06-20 | Hans-Holger Körner | Flow rate measuring apparatus for fluid media |
| EP2267416A1 (en) * | 2009-06-25 | 2010-12-29 | Amplitec GmbH & Co. KG | Flow rate measuring apparatus for fluid media with flow rectifier |
| CN102003984A (en) * | 2010-09-30 | 2011-04-06 | 上海维思仪器仪表有限公司 | Middle-low pressure gas flowmeter with small caliber |
| CN103267549A (en) * | 2013-04-26 | 2013-08-28 | 北京艾科瑞能源科技有限公司 | Ultrasonic flow meter |
| CN105953851A (en) * | 2015-12-14 | 2016-09-21 | 威海市天罡仪表股份有限公司 | High-precision ultrasonic reflectometer body structure |
| CN207081452U (en) * | 2017-08-24 | 2018-03-09 | 天津赛恩能源技术股份有限公司 | Ultrasonic measurement pipe segment structure for ultrasonic flowmeter |
-
2017
- 2017-08-24 CN CN201710732548.9A patent/CN107490411B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1798528A1 (en) * | 2005-12-16 | 2007-06-20 | Hans-Holger Körner | Flow rate measuring apparatus for fluid media |
| EP2267416A1 (en) * | 2009-06-25 | 2010-12-29 | Amplitec GmbH & Co. KG | Flow rate measuring apparatus for fluid media with flow rectifier |
| CN102003984A (en) * | 2010-09-30 | 2011-04-06 | 上海维思仪器仪表有限公司 | Middle-low pressure gas flowmeter with small caliber |
| CN103267549A (en) * | 2013-04-26 | 2013-08-28 | 北京艾科瑞能源科技有限公司 | Ultrasonic flow meter |
| CN105953851A (en) * | 2015-12-14 | 2016-09-21 | 威海市天罡仪表股份有限公司 | High-precision ultrasonic reflectometer body structure |
| CN207081452U (en) * | 2017-08-24 | 2018-03-09 | 天津赛恩能源技术股份有限公司 | Ultrasonic measurement pipe segment structure for ultrasonic flowmeter |
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| CN107490411A (en) | 2017-12-19 |
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