CN101995272A - Vortex street flowmeter with anti-vibration structure - Google Patents
Vortex street flowmeter with anti-vibration structure Download PDFInfo
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- CN101995272A CN101995272A CN2009100135474A CN200910013547A CN101995272A CN 101995272 A CN101995272 A CN 101995272A CN 2009100135474 A CN2009100135474 A CN 2009100135474A CN 200910013547 A CN200910013547 A CN 200910013547A CN 101995272 A CN101995272 A CN 101995272A
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Abstract
The invention relates to a vortex street flowmeter with an anti-vibration structure, a signal detection probe is positioned on the back surface of a vortex street generating body, the lower end of the signal detection probe is fixedly assembled on a probe shaft, the upper end of the signal detection probe is fixedly connected with a circular elastic diaphragm, a wedge-shaped groove is arranged at the upper end of the signal detection probe, a thermal insulation material is arranged in the wedge-shaped groove, a leading-out body is arranged on the upper surface of the thermal insulation material, a convex wedge is arranged at the lower end of the leading-out body and assembled in the wedge-shaped groove with the thermal insulation material, and two piezoelectric elements are symmetrically stuck on the plane of the leading-out body f the signal detection probe. The vortex street flowmeter is reasonable in design, ingenious in concept, easy for manufacture, convenient for use and strong in practicality, uses less material and is suitable for related fluid measurement.
Description
Technical field
What the present invention relates to is the vortex shedding flow meter instrument, and concrete is the version with antivibration, can reduce or eliminate the vortex street flowmeter sensor of vibration noise.
Background technology
Vortex shedding flow meter is to utilize in the measuring channel fluid that the isolated Karman vortex street in body both sides is taking place, and the vortex street vortex frequency is directly proportional with flow velocity, measures rate of flow of fluid by the survey sensor output signal frequency.In the development of vortex shedding flow meter, vibration problem, electromagnetic interference problem, measurement lower limit problem are the principal elements that hinders the vortex shedding flow meter development, uses.
In various detection vortex street frequency signal modes, the strongest with stress-type vortex street flowmeter to the adaptability of measuring fluid and process conditions, it is most widely used, and counter stress formula vortex shedding flow meter, it is particularly outstanding that vibration problem more seems, we can say that solving vibration problem is stress-type vortex street flowmeter, so the gordian technique place of all vortex shedding flow meters.
Stress-type vortex street flowmeter generally adopts the detecting element of piezoelectric ceramics as stress at present.But use its detected pressures, acceleration, vibration etc.This shows, how from reduce or eliminate the interference of vibration at all, be the core technology during flux of vortex street detects.
At present, domestic and international expert, scholar, manufacturer have proposed the method for many solution vibration problems.As:
Adopt simple beam structure, piezoelectric ceramics is attached to vibration moment of flexure place at zero point.But exist here because production and processing and use in the factors such as contamination of body take place, make vibration moment of flexure zero migration and can not solve vibration problem well.
Adopt one-piece type semi-girder vibration-proof structure.Promptly stretch into pipe section and extension respectively pastes two piezoelectric elements, be subjected to vibrating the deformation of generation, come the deformation that piezoelectric element has vibration to produce in the compensating measure pipeline with the piezoelectric element of measuring sonde extension at measuring sonde.But this method, because different, the shape of pipeline internal and external parts of the residing fluid state of piezoelectric element of the outer extension of piezoelectric element and pipeline, quality difference in the pipeline, and can not the interference noise that vibration causes well be compensated.
Adopt two probe detection architecture, this detection method is owing to the piezoelectric element piezoelectric property on former and later two probes, temperature characterisitic can not be identical, and because former and later two probe place vortex phase differential can not be 180 degree accurately, so can not offset the noise that produces by vibration fully.
Summary of the invention
The objective of the invention is at the stress-type vortex street flowmeter resistance to shock of present use relatively poor, and provide a kind of from theoretical and practical application angle: can solve its vibration noise problem to the utmost, improve the vortex shedding flow meter with anti-vibration structure of flow signal signal to noise ratio (S/N ratio).
For achieving the above object, the technical solution used in the present invention is:
Vortex shedding flow meter with anti-vibration structure comprises the table body and is installed in the interior vortex shedder of table body, flexible sheet, lead body and input probe; The table body is fixedlyed connected with measuring channel by pipe flange, described vortex shedder is triangulo column, ladder type cylinder or T type geometrical form, vortex shedder is perpendicular to the axial direction of measuring channel, and the upper/lower terminal that body takes place is fastenedly connected with the table body respectively; It is characterized in that:
Above-mentioned input probe is positioned at the back of vortex shedder, the lower end of input probe is installed on the probe axle, the axis of probe axle is concentric with the axis of input probe, the axis of probe axle and the axis normal of measuring channel, the lower end of probe axle support by rotating gliding mass with the table body and connect;
The upper end of input probe is provided with a wedge-shaped slot, be equiped with thermal insulation material in the wedge-shaped slot, be provided with lead body above the thermal insulation material, the lower end of lead body has the convex wedge, the convex wedge is installed in the wedge-shaped slot with thermal insulation material, meet and paste performance symmetry, a piezoelectric element and No. two piezoelectric elements that material is identical fully, the external vortex shedding flow meter converter of the signal lead of No. one, No. two piezoelectric element on the plane of lead body of convection cell U direction symmetrically.
Above-mentioned flexible sheet is a toroidal, and the outer rim suitable for reading of flexible sheet is interior along fixedlying connected with table body flange suitable for reading, and the end opening inner edge of flexible sheet is fixedlyed connected with the middle part of input probe.
Above-mentioned input probe can be rhombogen or other symmetrical multiple edge bodies.
The axis of above-mentioned input probe and the axis normal of measuring channel.
Principle of the present invention:
The present invention utilizes structural design, makes the caused piezoelectric element change in charge of vibration noise to cancel out each other, and the charge variation that detects piezoelectric element is the real traffic signal that is produced by fluid fully.
The anti-vibration principle: when fluid flows, produce vortex alternately in the vortex shedder both sides in pipeline, make input probe left and right sides alternatively swinging, the frequency of swing promptly is the frequency of vortex pulse.Produce compression stress YSL and swing in input probe lead body one side, thereby produce the drawing stress LSL moment (as shown in Figure 6) that on the lead body plane, rotates at the lead body opposite side, and then can be one, produce on No. two piezoelectric elements alternation periodically opposite polarity electric charge+QH and-QH changes (as shown in Figure 7), by recording one, the frequency of charge variation between No. two piezoelectric elements, just can extrapolate the mean flow rate of fluid, and no matter be horizontal vibration or vertical vibration, all can not produce moment of torsion, these vibrations all are the charge variation that polarization is identical on piezoelectric element (as shown in Figure 8), and its charge difference is 0.Thereby, can not cause opposite polarity charge variation on one, No. two piezoelectric element yet.Get the difference (as shown in Figure 7) of electric charge on two piezoelectric elements, be used to detect the pulse signal of vortex.In principle, can eliminate the influence of vibration noise fully.
Detection volume flow principle: when the physical dimension and the distance selection of input probe and vortex shedder were suitable, fluid can produce strong, stable Karman vortex street when flowing behind vortex shedder.When vortex when alternately separate on the vortex shedder both sides, the alternating pressure that produces in the vortex shedder both sides is poor, can make the input probe of back be subjected to a kind of rotating torque effect, cause two opposite polarity charge variation of piezoelectric element on the lead body, by detecting the charge variation of two piezoelectric elements, thereby measure the pulse signal frequency of vortex, extrapolate flow rate of fluid and flow.And as level, vertically arranged vortex shedding flow meter, its direction of vibration is horizontal direction or vertical direction, horizontal vibration is to the input probe moment that can not rotate, vertical vibration is to the input probe moment that can not rotate, the vortex that has only fluid to flow the to produce moment that can rotate on the probe of back.
Detect the mass rate principle: utilize above-mentioned vortex flow sensors, measure the lift FL of the alternation that vortex produces on vortex shedder,
f＝s
rU/md (2)
C
L-lift coefficient; M, d, A-and measurement caliber, the relevant geometric parameter of generation body;
S
r-Strouhal number (is approximate constant in the accuracy guarantee district);
ρ-Media density;
The whirlpool frequency of f-vortex shedding flow meter output;
The U-rate of flow of fluid
As long as then measure the lift that vortex frequency and main generation body are subjected to, from formula (3) as can be known: the ratio of FL/f is directly proportional with the fluid mass flow, thereby records the fluid mass flow.
Characteristics of the present invention:
Prove by multiple batches of repeated experiments that 1, using the present invention, to carry out flow measurement antivibration ability strong, the precision height, stable performance in maximum flow, minimum flow and usual amounts measurement range, reliable.
2, the present invention is simple in structure, and is with low cost, safe and reliable.
The present invention is reasonable in design, be skillfully constructed, materials are few, making is easy, and are easy to use, and practicality is very strong, the measurement of the suitable associated fluid of the present invention.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the connection diagram that the present invention is installed in pipeline.
Fig. 3 is generation body of the present invention and input probe shape and installation position synoptic diagram.
Fig. 4 is that the A-A of Fig. 2 is to cross-sectional schematic.
Fig. 5 is a piezoelectric element CHARGE DISTRIBUTION synoptic diagram of the present invention.
Fig. 6 is the view that piezoelectric element of the present invention is subjected to moment of torsion stress.
Fig. 7 is the CHARGE DISTRIBUTION synoptic diagram that piezoelectric element of the present invention is subjected to moment of torsion stress.
Fig. 8 is the charge pattern that piezoelectric element of the present invention is subjected to level, vertical vibration generation.
Embodiment
Vortex shedding flow meter with anti-vibration structure comprises table body 2 and is installed in table body 2 interior generation body 3, flexible sheet 4, lead body 5 and input and pops one's head in 14; Table body 2 is fixedlyed connected with measuring channel 12 by pipe flange 13, the triangulo column that described generation body 3 is known classics, ladder type cylinder or T type geometrical form, the axial direction of body 3 perpendicular to measuring channel 12 takes place, and the upper/lower terminal that body 3 takes place is fastenedly connected with the table body respectively;
Above-mentioned input probe 14 is a rhombogen, as shown in Figure 3, input 14 middle parts of popping one's head in are positioned at L1 position, body 3 rear end take place, and the horizontal length (length of rhombus long-diagonal) of rhombus input probe is L2, and promptly the upper and lower vortex of Fen Liing can ride on two opposite side of rhombogen just.
As for width d, the input of the generation body 3 of meeting convection cell U direction pop one's head in 14 middle parts apart from take place body 3 rear end distance L 1, input pop one's head in 14 cross section rhombus long-diagonals length L 2 and body 3 rear ends take place and input four sizes such as distance L between 14 rear ends of popping one's head in draw through designing and calculating according to parameters such as the bore of measuring channel 12, measured medium viscositys.
The upper end of input probe is provided with a wedge-shaped slot 6, be equiped with thermal insulation material 7 in the wedge-shaped slot 6, be provided with lead body 5 above the thermal insulation material 7, the lower end of lead body 5 has the convex wedge, the convex wedge is installed in the wedge-shaped slot 6 with thermal insulation material 7, meet and paste the polarised direction that performance piezoelectric element 9 that symmetry, material are identical fully and 10, numbers piezoelectric elements 9 of No. two piezoelectric elements and No. two piezoelectric elements 10 adopt piezoelectric crystals to shear on the plane of lead body 5 of convection cell U direction symmetrically.The signal lead 8 external vortex shedding flowmeter signal converters of No. one, No. two piezoelectric elements 9,10.
Can obtain vortex frequency input principle as Fig. 5,6,7, flow through as fluid body 3 takes place, isolate the vortex of alternation in both sides, swirling action is on the dual-side edge of input probe 14.Two piezoelectric elements are subjected to alterante stress as shown in Figure 6 on the lead body, and it is identical to obtain size on the signal lead 8 of a piezoelectric element 9 and No. two piezoelectric elements 10 respectively, opposite polarity electric charge (+2Q
H) and (2Q
H), the two poles of the earth electric charge is poor, promptly is that we will obtain the vortex pulse duration frequency signal, as shown in Figure 7. and accomplish mass balance when measuring channel 12 has vertical vibration to need only rhombus input probe 14, just can not produce torsion.And when measuring channel 12 has the horizontal axis vibration,,, promptly on the signal lead 8 of No. one, No. two piezoelectric elements 9,10, can obtain electric charge (+Q simultaneously so do not produce torsion because direction of vibration is parallel to piezoelectric element 9,10 No. one, No. two
H) or (Q
H), as shown in Figure 8, and two interpolar electric charges are made missionary society's counteracting noise signal.
Therefore, at the charge signal that the two ends of signal lead 8 record, have only reflection rate of flow of fluid vortex pulse duration frequency signal and not have vertically, the vibration and noise signals of horizontal vibration.
The shape of input probe 14 to one skilled in the art, under the prerequisite that does not break away from the principle of the invention, can also be made some improvement or distortion in actual applications, and these improvement or distortion also should be considered as protection scope of the present invention.
Claims (4)
1. the vortex shedding flow meter that has the anti-vibration structure comprises table body (2) and is installed in the interior generation body (3) of table body (2), flexible sheet (4), lead body (5) and input probe (14); Table body (2) is fixedlyed connected with measuring channel (12) by pipe flange (13), described generation body (3) is triangulo column, ladder type cylinder or T type geometrical form, the axial direction of body (3) perpendicular to measuring channel (12) takes place, and the upper/lower terminal that body (3) takes place is fastenedly connected with the table body respectively; It is characterized in that:
Above-mentioned input probe (14) is positioned at the back that body (3) takes place, input probe (14) is installed on the probe axle (15), the axis of probe axle (15) is concentric with the axis of input probe (14), the axis of probe axle (15) and the axis normal of measuring channel (12), the lower end of probe axle (15) support by rotating gliding mass (1) with table body (2) and connect;
The upper end of input probe (14) is provided with a wedge-shaped slot (6), be equiped with thermal insulation material (7) in the wedge-shaped slot (6), be provided with lead body (5) above the thermal insulation material (7), the lower end of lead body (5) has the convex wedge, the convex wedge is installed in the have thermal insulation material wedge-shaped slot (6) of (7), meet on the plane of lead body (5) of convection cell U direction and paste performance symmetry fully symmetrically, piezoelectric element (9) that material is identical and No. two piezoelectric elements (10), No. one, No. two piezoelectric elements (9), (10) the external vortex shedding flow meter converter of signal lead (8).
2. the vortex shedding flow meter with anti-vibration structure according to claim 1, it is characterized in that: above-mentioned flexible sheet (4) is a toroidal, the outer rim suitable for reading of flexible sheet (4) is interior along fixedlying connected with table body flange suitable for reading (11), and the end opening inner edge of flexible sheet (4) is fixedlyed connected with the middle part of input probe (14).
3. the vortex shedding flow meter with anti-vibration structure according to claim 1 is characterized in that: above-mentioned input probe (14) is rhombogen, trigone or other symmetrical multiple edge bodies.
4. the vortex shedding flow meter with anti-vibration structure according to claim 1 is characterized in that: the axis normal of the axis of above-mentioned probe axle (15) and measuring channel (12).
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| CN101995272B CN101995272B (en) | 2011-10-05 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102620773A (en) * | 2012-03-23 | 2012-08-01 | 天津市胜武仪表技术有限公司 | Wide-range precession vortex gas flow meter |
| CN105403234A (en) * | 2015-12-08 | 2016-03-16 | 马瑞利汽车电子(广州)有限公司 | Piezoelectric door handle sensor structure |
| CN105973318A (en) * | 2016-06-27 | 2016-09-28 | 合肥精大仪表股份有限公司 | High-performance hygienic vortex shedding flowmeter |
| CN106197581A (en) * | 2016-06-15 | 2016-12-07 | 浙江师范大学 | A kind of self-powered pipe flow speed monitor |
| CN109782016A (en) * | 2018-12-25 | 2019-05-21 | 南京航空航天大学 | A kind of flow rate of liquid detection device and detection method based on Position Technique and vortex street phenomenon |
| CN115371752A (en) * | 2022-08-08 | 2022-11-22 | 重庆川仪自动化股份有限公司 | Pipeline type thermal gas mass flowmeter |
| CN116202584A (en) * | 2023-05-05 | 2023-06-02 | 河南新航流量仪表有限公司 | Vibration-resistant vortex shedding flowmeter |
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| US4926695A (en) * | 1987-09-15 | 1990-05-22 | Rosemount Inc. | Rocking beam vortex sensor |
| CN2085952U (en) * | 1990-12-05 | 1991-10-02 | 哈尔滨工业大学 | Double-vortex street flow transducer |
| JP3210425B2 (en) * | 1992-01-22 | 2001-09-17 | 株式会社東芝 | Recording and playback device |
| US5736647A (en) * | 1995-08-07 | 1998-04-07 | Oval Corporation | Vortex flow meter detector and vortex flow meter |
| CN1200253C (en) * | 2003-01-17 | 2005-05-04 | 浙江大学 | Suspension type self vibration damping difference flow sensor |
| RU2279639C2 (en) * | 2004-08-27 | 2006-07-10 | Открытое акционерное общество "Саранский приборостроительный завод" | Vortex flow meter |
| CN101294831A (en) * | 2008-06-19 | 2008-10-29 | 崔从文 | Differential-capacitor type vortex-street flow meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102620773A (en) * | 2012-03-23 | 2012-08-01 | 天津市胜武仪表技术有限公司 | Wide-range precession vortex gas flow meter |
| CN105403234A (en) * | 2015-12-08 | 2016-03-16 | 马瑞利汽车电子(广州)有限公司 | Piezoelectric door handle sensor structure |
| CN106197581A (en) * | 2016-06-15 | 2016-12-07 | 浙江师范大学 | A kind of self-powered pipe flow speed monitor |
| CN106197581B (en) * | 2016-06-15 | 2023-03-24 | 浙江师范大学 | Self-powered pipeline flow velocity monitor |
| CN105973318A (en) * | 2016-06-27 | 2016-09-28 | 合肥精大仪表股份有限公司 | High-performance hygienic vortex shedding flowmeter |
| CN105973318B (en) * | 2016-06-27 | 2022-04-19 | 合肥精大仪表股份有限公司 | High-performance sanitary vortex shedding flowmeter |
| CN109782016A (en) * | 2018-12-25 | 2019-05-21 | 南京航空航天大学 | A kind of flow rate of liquid detection device and detection method based on Position Technique and vortex street phenomenon |
| CN109782016B (en) * | 2018-12-25 | 2022-04-19 | 南京航空航天大学 | Liquid flow velocity detection device and detection method based on positron technology and vortex street phenomenon |
| CN115371752A (en) * | 2022-08-08 | 2022-11-22 | 重庆川仪自动化股份有限公司 | Pipeline type thermal gas mass flowmeter |
| CN116202584A (en) * | 2023-05-05 | 2023-06-02 | 河南新航流量仪表有限公司 | Vibration-resistant vortex shedding flowmeter |
| CN116202584B (en) * | 2023-05-05 | 2023-07-18 | 河南新航流量仪表有限公司 | Vibration-resistant vortex shedding flowmeter |
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