CN101979964B - Vortex shedding flowmeter capable of changing sensor online - Google Patents
Vortex shedding flowmeter capable of changing sensor online Download PDFInfo
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- CN101979964B CN101979964B CN2010102804818A CN201010280481A CN101979964B CN 101979964 B CN101979964 B CN 101979964B CN 2010102804818 A CN2010102804818 A CN 2010102804818A CN 201010280481 A CN201010280481 A CN 201010280481A CN 101979964 B CN101979964 B CN 101979964B
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Abstract
The invention belongs to the technical field of flow measurement instruments, and relates to a vortex shedding flowmeter capable of changing a sensor online. The vortex shedding flowmeter comprises a flow measuring tube, a vortex detection body, the sensor and a vortex generator which is fixedly arranged in the flow measuring tube and is positioned above the vortex detection body. The vortex shedding flowmeter is characterized in that: a hollow cavity is formed in the vortex detection body, and the tail end on the outer side is provided with a tail vane; the tail part of the sensor is provided with an elastic body, and the sensor is inserted in the hollow cavity of the vortex detection body and is tightly jointed with the vortex detection body through the elastic body; and the vortex detection body is connected with a tube wall mounting hole of the flow measuring tube and is welded for sealing. The vortex shedding flowmeter has the following advantages that: the sensor and the vortex detection body can be tightly jointed together through the elastic body and a compression nut at the tail end of the sensor, and the sensitivity is high; the vortex detection body is connected with the flow measuring tube by welding, and the sealability is high; and the aim of changing the sensor without stopping conveying materials can be fulfilled by unscrewing and taking down the compression nut online. The vortex shedding flowmeter has a simple structure and is convenient to process.
Description
Technical field
The invention belongs to the flow measurement instrument technical field, but be specifically related to a kind of vortex shedding flow meter of on-line replacing sensor.
Background technology
Vortex shedding flow meter is based on the Karman vortex street principle, and promptly fluid produces whirlpool in eddy generator (blunt form choked flow piece) back, and the flow velocity of whirlpool frequency and pipeline inner fluid is proportional.Fluid is through behind the eddy generator, changes the whirlpool frequency that can record fluid from the fluid differential pressure of vortex arising, and then the flow of measurable flow body.Vortex shedding flow meter can be measured fluid flow, also can be used for the measurement gas flow.
The fluid differential pressure of test fluid vortex arising changes, and can sensor be installed in eddy generator rear side in the pipeline, and the whirlpool of fluid can make the sensor mechanical hook-up produce small motion, and sensing part will detect motor message and convert electric signal to.Because there are various operating modes such as high temperature, burn into high pressure in processing medium, the sensing part that contacts with measured medium usually is impaired easily.
When common vortex shedding flow meter is changed at the impaired needs of sensing part, must stop convey materials, need be with the pipeline material cut-off, the pressure in the pipeline is laid down, and could change sensing part.One Chinese patent application number is 01205954.4; Name is called the utility model patent of " the constantly sensing head of replaceable vortex flow sensors under the flow "; Disclose and a kind ofly need not cut off the design that processing medium is replaceable sensing part; Its shortcoming is that sensing part leaves fluid whirlpool sensing mechanical hook-up apart from far away, and it is low that signal transmits sensitivity, external vibration poor performance such as anti-pipeline; And the mechanical hook-up of sensor adopts mechanical seals such as pad, uses for high temperature, Korrosionsmedium and is easy to generate leakage.Disclosed vortex shedding flow meter also has the function of on-line replacing sensor in the U.S. Pat 4926695, and it is with the sensing mechanical sensitivity parts and the integrated processing of eddy generator of detecting sensor.Fluid whirlpool sensing mechanical sensitivity parts and eddy generator are integrated, have reduced the susceptibility of measurement component, and processing technology is complicated.
Summary of the invention
The technical matters that the present invention will solve provide a kind of processing and production technology simple, sensor has high sensitivity, and high temperature resistant, high pressure, but the vortex shedding flow meter of antileakaging on-line replacing sensor.
For achieving the above object; The technical scheme that the present invention adopts is: but the vortex shedding flow meter of on-line replacing sensor; Comprise flow tube, vortex detection body, sensor; Be fixedly mounted in the flow tube and be positioned at the eddy generator at the said vortex detection body upper reaches, it is characterized in that: the built-in hollow cavity of said vortex detection body, outside tail end has flat wedge-shaped flight; Said sensor afterbody is equipped with elastic body, and sensor places in the hollow cavity of vortex detection body, and fits tightly through elastic body and vortex detection body; Said vortex detection body is connected welded seal with said flow measurement tube wall mounting hole.
Be equipped with metallic O ring between said vortex detection body and the said sensor; Gland nut through placing the said sensor outside is fixedly connected.
Said sensor is piezoelectric transducer or capacitance type sensor.
The hollow cavity of said vortex detection body comprises to be measured the chamber and places the support chamber of measuring the end, chamber, and the support chamber internal diameter is the transition taper surface and connects less than measuring the chamber internal diameter.
Said elastic body end is discontinuous, is in-line or cruciform is cut apart.
Said elastomeric rear end external diameter is less than the support chamber internal diameter, and said elastomeric front end external diameter closely contacts with the support chamber medial surface of said vortex detection body, and do not contact with the bottom surface of support chamber greater than the support chamber internal diameter.
Good effect of the present invention is: through the elastic body of sensor tail end and the gland nut on sensor top, sensor and vortex detection body are combined closely, and highly sensitive; Vortex detection body and flow tube are welded to connect, good seal performance; Because sensor directly do not contact with material, so can use, and must not stop convey materials during emat sensor under high temperature, high pressure operating mode more yet.Can be online through unscrewing, take off gland nut, reach the more purpose of emat sensor.The present invention is simple in structure, and is easy to process.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1: structural representation of the present invention;
The A-A of Fig. 2: Fig. 1 is to view;
Fig. 3: vortex detection body structure synoptic diagram (amplification) among Fig. 2;
Fig. 4: the elastomer structure synoptic diagram (amplification) of sensor tail end.
Among the figure, the 1-flow tube; 2-vortex detection body; The 3-gland nut; 4-metal O type circle; The 5-sensor; The 6-elastic body; 7-vortex detection body empennage; The 8-eddy generator; 9-measures the chamber; The 10-support chamber.
Embodiment
Structural representation of the present invention is as depicted in figs. 1 and 2; But the vortex shedding flow meter of on-line replacing sensor; Comprise flow tube 1, vortex detection body 2, sensor 5; Be fixedly mounted in the flow tube 1 and be positioned at the eddy generator 8 at said vortex detection body 2 upper reaches, it is characterized in that: said vortex detection body 2 built-in hollow cavities, outside tail end has flat wedge-shaped flight 7; Said sensor 5 afterbodys are equipped with elastic body 6, and sensor 5 places in the hollow cavity of vortex detection body 2, and fit tightly through elastic body 6 and vortex detection body 2 medial surfaces; Said vortex detection body 2 is connected with said flow tube 1 tube wall mounting hole, welded seal, and this moment, vortex shedding flow meter formed complete hermetically-sealed construction.
Be equipped with metallic O ring 4 between said vortex detection body 2 and the said sensor 5; Gland nut 3 through placing the outside, said sensor 5 tops is fixedly connected the fastening degree that can regulate sensor 5 through gland nut 3.O type metal o-ring 4 can prevent that outside steam or wet gas from getting in vortex detection body 2 cavities, and O type metal o-ring 4 can play the effect of sealing.
Said sensor 5 is piezoelectric transducer or capacitance type sensor.
Shown in Figure 3 like Fig. 2 and vortex detection body structure synoptic diagram, the built-in hollow cavity of said vortex detection body, hollow cavity comprise measures chamber 9 and support chamber 10, and outside tail end has flat wedge-shaped flight 7, has good intensity and sensitivity.The measurement chamber 9 of vortex detection body 2 all is hollow cylindrical with support chamber 10, and support chamber 10 internal diameters are less than measuring chamber 9 internal diameters, between be the transition taper surface and connect.The tapered structure in the outside of vortex detection body 2, tail end have flat wedge-shaped flight 7, both can reach higher intensity, and good sensitivity is arranged again.
Like Fig. 2 and shown in Figure 4, the front end external diameter of the elastic body 6 of sensor tail end is greater than support chamber 10 internal diameters, and the rear end external diameter of said elastic body 6 is less than support chamber 10 internal diameters.Add man-hour, can preset the internal diameter of sensor 5 afterbody external diameters,, form elastic construction through cutting into in-line or cruciform otch greater than vortex detection body 2 support chamber 10.After the elastic body 6 that can guarantee sensor 5 afterbodys inserted in vortex detection bodies 2 support chamber 10, sensor 5 can fit tightly with vortex detection body 2, installs firmly, and can not be stuck in vortex detection body 2 support chamber 10.After sensor 5 inserts in vortex detection body 5 support chamber simultaneously; The elastic body 6 of afterbody does not contact with vortex detection body 2 support chamber 10 bottom surfaces, leaves a fixed gap, can guarantee sensor 5 and vortex detection body 2 support chamber 10 madial wall strong bonded like this; Can not produce extra-stress, the mechanics transmission is abundant.
Principle of work of the present invention is following: the fluid eddy generator 8 of in flow tube 1, flowing through, produce the fluid whirlpool, and transmit the whirlpool differential pressure signals through vortex detection body 2.Said vortex detection body 2 has flat wedge-shaped flight 7, through empennage 7 sensing fluid whirlpools, produces the vibration with fluid whirlpool same frequency; Because comprising, vortex detection body 2 built-in hollow cavities measure chamber 9 and support chamber 10; Sensor 5 afterbody elastic bodys 6 are fixed in the support chamber 10 of vortex detection body 2, fit tightly with support chamber 10 madial walls, and do not contact with support chamber 10 bottom surfaces; Therefore; Can not produce additional stress, the mechanics transmission is abundant, and is highly sensitive.After sensor 5 detected the frequency signal of fluid vortex arising, signal passed to flow transmitter, converted frequency signal to flow signal by flow transmitter, through demonstration after calculating, also through electric current or frequency delivery rate signal.
Claims (6)
1. but the vortex shedding flow meter of on-line replacing sensor; Comprise flow tube, vortex detection body, sensor and be fixedly mounted in the flow tube and be positioned at the eddy generator at the said vortex detection body upper reaches; It is characterized in that: the built-in hollow cavity of said vortex detection body, outside tail end has flat wedge-shaped flight; Said sensor afterbody is equipped with elastic body, and sensor places in the hollow cavity of vortex detection body, and fits tightly through elastic body and vortex detection body; Said vortex detection body is connected welded seal with said flow measurement tube wall mounting hole.
2. but the vortex shedding flow meter of on-line replacing sensor as claimed in claim 1 is characterized in that: be equipped with metallic O ring between said vortex detection body and the said sensor; Said sensor is fixedly connected with said vortex detection body through placing the gland nut in the said sensor outside.
3. but according to claim 1 or claim 2 the vortex shedding flow meter of on-line replacing sensor, it is characterized in that: said sensor is piezoelectric transducer or capacitance type sensor.
4. but the vortex shedding flow meter of on-line replacing sensor as claimed in claim 1; It is characterized in that: the hollow cavity of said vortex detection body comprises to be measured the chamber and places the support chamber of measuring the end, chamber; And the support chamber internal diameter is the transition taper connection less than measuring the chamber internal diameter.
5. but the vortex shedding flow meter of on-line replacing sensor as claimed in claim 1 is characterized in that: said elastic body end is discontinuous, is in-line or cruciform is cut apart.
6. but the vortex shedding flow meter of on-line replacing sensor as claimed in claim 4; It is characterized in that: said elastomeric rear end external diameter is less than the support chamber internal diameter; Said elastomeric front end external diameter is greater than the support chamber internal diameter; Closely contact with the support chamber medial surface of said vortex detection body, and do not contact with the bottom surface of support chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102804818A CN101979964B (en) | 2010-09-14 | 2010-09-14 | Vortex shedding flowmeter capable of changing sensor online |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102804818A CN101979964B (en) | 2010-09-14 | 2010-09-14 | Vortex shedding flowmeter capable of changing sensor online |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101979964A CN101979964A (en) | 2011-02-23 |
| CN101979964B true CN101979964B (en) | 2012-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102804818A Expired - Fee Related CN101979964B (en) | 2010-09-14 | 2010-09-14 | Vortex shedding flowmeter capable of changing sensor online |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103727985A (en) * | 2013-12-11 | 2014-04-16 | 天津大学 | Flexible vortex street probe based on triaxial accelerometer |
| CN104568023A (en) * | 2014-12-12 | 2015-04-29 | 重庆川仪自动化股份有限公司 | Vortex shedding flowmeter |
| CN108955783B (en) * | 2018-07-30 | 2020-03-31 | 广州仪控自动化仪表有限公司 | Plugging device and vortex shedding flowmeter using same |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3046363B2 (en) * | 1991-01-11 | 2000-05-29 | 株式会社オーバル | Sensor for Karman vortex flow meter |
| DK0841545T3 (en) * | 1996-11-08 | 1999-11-08 | Flowtec Ag | Eddy current detector |
| US6352000B1 (en) * | 1998-08-12 | 2002-03-05 | Flowtec Ag | Vortex flow sensor |
| CN2473594Y (en) * | 2001-02-28 | 2002-01-23 | 刘忠海 | Sensitive head capable of changing vortex street flow sensor under uninterrupted flow |
| JP2003322553A (en) * | 2002-05-07 | 2003-11-14 | Yokogawa Electric Corp | Vortex flowmeter |
| CN2564992Y (en) * | 2002-08-06 | 2003-08-06 | 哈尔滨工业大学博思特仪器仪表有限公司 | Capacitance probe for vortex street flow sensor |
| JP4129881B2 (en) * | 2006-04-20 | 2008-08-06 | 株式会社オーバル | Explosion-proof high temperature multi-vortex flowmeter |
| CN201344807Y (en) * | 2009-01-01 | 2009-11-11 | 潍坊奥博仪表科技发展有限公司 | Vortex flowmeter capable of replacing probe without stopping flow |
| CN201764992U (en) * | 2010-09-14 | 2011-03-16 | 涂强 | Vortex flow meter capable of replacing sensor on line |
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Granted publication date: 20121121 Termination date: 20160914 |