CN2911613Y - Six-electrode electromagnetic flowmeter - Google Patents
Six-electrode electromagnetic flowmeter Download PDFInfo
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- CN2911613Y CN2911613Y CN 200620042421 CN200620042421U CN2911613Y CN 2911613 Y CN2911613 Y CN 2911613Y CN 200620042421 CN200620042421 CN 200620042421 CN 200620042421 U CN200620042421 U CN 200620042421U CN 2911613 Y CN2911613 Y CN 2911613Y
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- 239000002184 metal Substances 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 28
- 238000009413 insulation Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 description 11
- 239000012530 fluid Substances 0.000 description 9
- 238000011144 upstream manufacturing Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 239000012141 concentrate Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007772 electrode material Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model is a six-electrode magnetic flowmeter which belongs to the measurement technology field. The magnetic flowmeter is composed of six electrodes which are arranged on the circular cross section of the sensor conduit pipe perpendicular to the central axis of the conduit, wherein four electrodes are symmetric about the x-axis and y-axis of the circular cross section and insulated against the conduit pipe and the other two are solution-immerged electrodes; two electrodes are arranged as a group, and the two solution-immerged electrodes are positioned between the two groups of electrodes; two electrodes in the same group are securely connected, and the two groups of electrodes are connected with a converter amplifier respectively; the two securely connected solution-immerged electrodes are connected with the metal phase of the conduit pipe and are also connected with the grounding of the converter amplifier and used as the grounding for magnetic flow signals. The six-electrode magnetic flowmeter utility model has the advantages of a low measurement additional error, easy assembling, a reliable grounding reference, and a reliable solution-contacting reference.
Description
Technical field
The utility model relates to measuring technique, particularly relates to the flowmeter technology in a kind of industrial automation instrument.
Background technology
Electromagnetic flowmeter is made up of electromagnetic flow transducer (hereinafter to be referred as sensor) and electromagnetic flux converter (hereinafter to be referred as converter).Converter provides exciting current for the field coil of sensor (sensor construction as shown in Figure 1), generation work magnetic field in the zone of the conduit that the detection signal electrode is housed.Conducting liquid flows through the magnetic field intercepts magnetic line of force, can respond to the electromotive force that is directly proportional with flow rate of liquid on detecting electrode.Converter amplifies the electromotive force of induction, convert to and can be other and accept electric current, frequency or the digital communication signal that instrument or device receive, with measurement, metering or the control of finishing conductive fluid.
Theoretical analysis shows that the signal electromotive force of responding on the sensor electrode is the set of countless fluid fine particle induced potentials in the sensor conduit.And the fluid fine particle induced potential of diverse location is different to the signal electromotive force contribution on the detecting electrode in the conduit.Usually represent that with weighting function W diverse location is to the contribution of signal electromotive force on the detecting electrode in the conduit.Proved also that in theory the geometric configuration of detecting electrode and the size of big or small weighting function are also different.Fig. 2 is the distribution of the weighting function of two point electrode two-dimensional case.Fig. 3 is the distribution of the weighting function of broad-area electrode.
Two point electrodes obtain the contribution of signal electromotive force, concentrate on two fan-shaped zones of electrode near axis.Therefore the velocity distribution of working as the inflow flowmeter fluid is not a symmetric case for catheter center's axle, and measurement can produce very mistake.Velocity flow profile is not that the reason of symmetry is that flowmeter upstream straight-line segment falls short of with the central shaft, and shock resistance parts such as the elbow in the pipeline, valve cause.For this reason, the related standards regulation, must there be the straight length greater than 5 times of sensor diameters the installation upstream of two point electrode arrangement electromagnetic flowmeters.For large diameter pipeline, this condition can not be satisfied in many erecting stagies, and this will produce measuring error;
Broad-area electrode obtains the contribution of signal electromotive force, concentrate in the conduit circle cross section remove up and down two arc, middle most zone.Compared with center section, two arc proportions are less.Therefore the velocity distribution of working as the inflow flowmeter fluid is not a symmetric case for catheter center's axle, and it is little to measure the error that produces.But, broad-area electrode manufacturing process complexity, the insulation lining of electrode and conduit is difficult to attach fully in the practical set, is difficult to guarantee the sealing of electrode.
In addition, the induced signal voltage of electromagnet flow meter sensor output should be reference point with the fluid to be measured.Usually conducting liquid is to rely on to be equipped with metal ground loop (connecing pendular ring) with the metallic conduit of sensor installation upstream and downstream or sensor two ends and to contact, and the extraction voltage benchmark is to the converter amplifier.Yet the upstream and downstream metallic conduit is different with the potential electrode material, perhaps pipeline rust, will cause the direct current polarization interference voltage of change or contact unreliable.Simultaneously, adopt ground loop need with potential electrode material of the same race, can enlargement discharge meter manufacturing cost.
As shown in Figure 1, existing electromagnet flow meter sensor primary structure has: be provided with parts such as the conduit 12 of lining 10, ground loop 8, electrode 11, the shell 4 that is provided with flange 1, suspension ring 2, terminal box 3, support 13 and yoke 5, pole shoe 6, field coil 7, measuring tube 9 and form.Conduit 12 is not magnetic conductive metal pipes of liner insulation lining, and two measurement point electrode 11 symmetries are contained in the conduit radial position.Sensor is installed in the pipeline, and conducting liquid flows through sensor.Converter provides exciting current to field coil, produces magnetic field in sensor, and moving fluid cutting magnetic line potential electrode will be obtained induced electromotive force.
As shown in Figure 2, in the surface chart of electrode place conduit, A and B are two electrodes, and H represents the direction in magnetic field.W is a weighting function, and the electromotive force that diverse location each point fluid fine particle is produced in its expression section is to the contribution proportion of two electrodes.Obviously become 90 ° of positions to want much responsive with electrode to change in flow near the electrode.
As shown in Figure 3, can see that electrode zone area occupied ratio is big in the distribution of the weighting function W of curved broad-area electrode, average W is near 1, and the asymmetric influence of velocity flow profile is little.
As shown in Figure 4, the regularity of distribution of a quadrant weighting function of four electrodes is consistent with broad-area electrode.
The utility model content
At the defective that exists in the above-mentioned prior art, technical problem to be solved in the utility model provide a kind of measure additive error little, be convenient to assemble, can provide reference potential reliably, connect the reliable six electrode electromagnetic flowmeters of liquid benchmark.
In order to solve the problems of the technologies described above, a kind of six electrode electromagnetic flowmeters provided by the utility model, the circular section that is included in the sensor conduit vertical with the catheter center axle is provided with the electrode of (installation), it is characterized in that, in the described electrode, four be with the X-axis of circular section and Y-axis symmetry, to (signal) potential electrode of pipe insulation, two for connecing the liquid electrode; Two potential electrode are one group, and two connect the liquid electrode and are located at respectively between two groups of potential electrode;
Reliably connect between two potential electrode on the same group, two groups of potential electrode connect the converter amplifier respectively; Two connect between the liquid electrode the reliable back that connects and are connected with the metal of measuring guide, and as the earth terminal of the benchmark ground connection converter amplifier of flow signal.Sensor constitutes differential signal output, can directly be common to and the supporting converter of two electrode sensors.
Further, described two groups of potential electrode are distributed in the X-axis both sides of described circular section symmetrically,
Further, the sensor conduit wall in described circular section is certain radian (as 40 °) between described two potential electrode on the same group.
Further, described two connect the upper/lower terminal point that the liquid electrode is located at two groups of Y-axis between the potential electrode.
Further, couple together with the lead with insulating sheath between described two potential electrode on the same group, these two interelectrode resistance are 0 Ω.
Further, insulation resistance is not less than 50M Ω between described two groups of potential electrode in parallel.
Further, described potential electrode greater than 50M Ω, and can be born the above compressive resistance of 500V to the insulation resistance of metal catheter.
Further, the described resistance that is connected that connects liquid electrode and metal catheter is 0 Ω.
The six electrode electromagnetic flowmeters that utilize the utility model to provide, take into account the advantage of two electrodes and broad-area electrode owing to adopt the four measuring electrode, can satisfy the 2 times of straight lengths in flowmeter upstream, measure additive error, and can be convenient to assembling as two point electrodes less than ± 0.2%; Two other electrode is as connecing the liquid electrode, for flow signal voltage provides reference potential reliably in six electrodes of the present utility model.
Four measuring electrode of the present utility model obtains the contribution of signal electromotive force, and is the same with broad-area electrode, concentrate in the conduit circle cross section except that up and down two arc subregion broad in the middle; Its area is arc big more than two.So, when the velocity distribution that flows into flowmeter fluid also little for the error that catheter center's axle asymmetric case produces; Equally, because be the point electrode arrangement form, sealing be installed solve easily; The described liquid electrode that connects is arranged on upper and lower two end points of Y-axis.Purpose is that the precipitated thing of liquid electrode covers or the gas that floated insulate in order to prevent to connect, and guarantees to connect the reliable of liquid benchmark.
Description of drawings
Fig. 1 is the structural drawing of sensor in the prior art;
Fig. 2 is the weighting function distribution plan of two point electrodes in the prior art;
Fig. 3 is the weighting function distribution plan of broad-area electrode in the prior art;
Fig. 4 is weighting function distribution (1/4th quadrants) figure of four potential electrode in the prior art;
Fig. 5 is six electrode position synoptic diagram of the catheter section of the utility model embodiment;
The equivalent circuit diagram of Fig. 6 the utility model embodiment six electrode electromagnetic flow transducers and converter wiring.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model is described in further detail, but present embodiment is not limited to the utility model, every employing analog structure of the present utility model and similar variation thereof all should be listed protection domain of the present utility model in.
As shown in Figure 5, the six electrode electromagnetic flowmeters that provided of the utility model embodiment are to be provided with (installation) six electrodes on the circular section of the sensor conduit vertical with the catheter center axle; Wherein, four is that 15, two at signal measurement electrode is for connecing liquid electrode 16; Two potential electrode 15 are one group, two groups of potential electrode are distributed in the X-axis both sides of described circular section symmetrically, four measuring electrode 15 respectively with X-axis and Y-axis symmetry, radian R between two potential electrode of one group on the sensor conduit wall of described circular section is 40 °, and two connect the upper/lower terminal point that liquid electrode E, F are located at Y-axis between two groups (potential electrode).In embodiment of the present utility model, the radian R between two potential electrode of one group on the sensor conduit wall of described circular section also can be greater than (or less than) 40 °.
Mode of connection of the present utility model, as shown in Figure 6.With potential electrode A and B, C and the D short circuit of X-axis both sides, enter signal input part A ', the C ' of converter amplifier 30 after promptly potential electrode A, B and C, D link together with lead as signal electrode respectively; Connect liquid electrode E, F short circuit with two, promptly meet liquid electrode E, F and connect the back with lead and be connected with the metal of measuring guide, and as the earth terminal G of the benchmark ground connection converter amplifier 30 of flow signal; Sensor 20 constitutes differential signal output, can directly be common to the converter 30 supporting with two electrode sensors.
The liquid electrode that connects of the present utility model is arranged on upper and lower two end points of Y-axis.Purpose is that the precipitated thing of liquid electrode covers or the gas that floated insulate in order to prevent to connect, and guarantees to connect the reliable of liquid benchmark.
Specific implementation method: the processing in the catheter electrode hole of six electrode electromagnet flow meter sensors, should note position distribution, referring to Fig. 5 at circle cross section.The potential electrode of Y-axis both sides couples together with the lead with insulating sheath respectively, referring to Fig. 6.These two interelectrode resistance are 0 Ω.Insulation resistance is not less than 50M Ω between two groups of potential electrode in parallel.Every group of potential electrode and metal catheter must be state of insulations, and potential electrode should be greater than 50M Ω to the insulation resistance of metal catheter, and can bear the above compressive resistance of 500V.Connect the liquid electrode through with the metal catheter insulated enclosure after, must reliably be connected with lead with metal catheter, referring to Fig. 6.The resistance that is connected that connects liquid electrode and metal catheter almost is 0 Ω.
Should do water-stop and water pressure resistance test after electrode and the conduit assembling, the compressive resistance that satisfies 1.5 times of nominal pressures must not have leakage phenomenon.
Claims (7)
1, a kind of six electrode electromagnetic flowmeters, be included in the electrode that the circular section of the sensor conduit vertical with the catheter center axle is provided with, it is characterized in that, in the described electrode, four be with the X-axis of circular section and Y-axis symmetry, to the potential electrode of pipe insulation, two for connecing the liquid electrode; Two potential electrode are one group, and two connect the liquid electrode and are located at respectively between two groups of potential electrode;
Reliably connect between two potential electrode on the same group, two groups of potential electrode connect the converter amplifier respectively; Two connect between the liquid electrode the reliable back that connects and are connected with the metal of measuring guide, and as the earth terminal of the benchmark ground connection converter amplifier of flow signal.
2, six electrode electromagnetic flowmeters according to claim 1 is characterized in that, described two connect the upper/lower terminal point that the liquid electrode is located at two groups of Y-axis between the potential electrode.
3, six electrode electromagnetic flowmeters according to claim 1 is characterized in that, described two groups of potential electrode are distributed in the X-axis both sides of described circular section symmetrically.
4, six electrode electromagnetic flowmeters according to claim 1 is characterized in that, the connection resistance between described two potential electrode on the same group is 0 Ω.
5, six electrode electromagnetic flowmeters according to claim 1 is characterized in that, insulation resistance is not less than 50M Ω between described two groups of potential electrode in parallel.
6, six electrode electromagnetic flowmeters according to claim 1 is characterized in that, described potential electrode greater than 50M Ω, and can be born the above compressive resistance of 500V to the insulation resistance of metal catheter.
7, six electrode electromagnetic flowmeters according to claim 1 is characterized in that, the described resistance that is connected that connects liquid electrode and metal catheter is 0 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620042421 CN2911613Y (en) | 2006-06-05 | 2006-06-05 | Six-electrode electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620042421 CN2911613Y (en) | 2006-06-05 | 2006-06-05 | Six-electrode electromagnetic flowmeter |
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| Publication Number | Publication Date |
|---|---|
| CN2911613Y true CN2911613Y (en) | 2007-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620042421 Expired - Fee Related CN2911613Y (en) | 2006-06-05 | 2006-06-05 | Six-electrode electromagnetic flowmeter |
Country Status (1)
| Country | Link |
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| CN (1) | CN2911613Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769770A (en) * | 2008-11-19 | 2010-07-07 | Abb技术股份公司 | The method that is used for the operations flows measuring device |
| CN102435238A (en) * | 2011-11-02 | 2012-05-02 | 中国计量学院 | Bridge type flow measuring method for flow measurement of conductive fluid and device thereof |
| CN107923777A (en) * | 2015-08-13 | 2018-04-17 | 恩德斯+豪斯流量技术股份有限公司 | Determine to be fully formed the magnetic induction flowmeter and its method of rotational symmetry flow profile existence |
| CN111699366A (en) * | 2019-11-04 | 2020-09-22 | 深圳市大疆创新科技有限公司 | Electromagnetic flowmeter and agricultural plant protection machine |
-
2006
- 2006-06-05 CN CN 200620042421 patent/CN2911613Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769770A (en) * | 2008-11-19 | 2010-07-07 | Abb技术股份公司 | The method that is used for the operations flows measuring device |
| CN102435238A (en) * | 2011-11-02 | 2012-05-02 | 中国计量学院 | Bridge type flow measuring method for flow measurement of conductive fluid and device thereof |
| CN107923777A (en) * | 2015-08-13 | 2018-04-17 | 恩德斯+豪斯流量技术股份有限公司 | Determine to be fully formed the magnetic induction flowmeter and its method of rotational symmetry flow profile existence |
| CN111699366A (en) * | 2019-11-04 | 2020-09-22 | 深圳市大疆创新科技有限公司 | Electromagnetic flowmeter and agricultural plant protection machine |
| WO2021087666A1 (en) * | 2019-11-04 | 2021-05-14 | 深圳市大疆创新科技有限公司 | Electromagnetic flowmeter and agricultural plant protection machine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Patentee address after: 201907 No. 5553 Hu Tai Road, Shanghai, Baoshan District Patentee address before: 201907 No. 5553 Hu Tai Road, Shanghai, Putuo District |
|
| ASS | Succession or assignment of patent right |
Owner name: SHANGHAI KENT INSTRUMENTATION CO., LTD. Free format text: FORMER OWNER: SHANGHAI KENT INTELLIGENCE METER CO., LTD. Effective date: 20100504 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 201907 NO.5553, HUTAI ROAD, BAOSHAN DISTRICT, SHANGHAI CITY TO: 201415 NO.6850, DATING ROAD, TINGLIN TOWN, JINSHAN DISTRICT, SHANGHAI CITY, CHINA |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20100504 Address after: 201415, Jinshan District, Shanghai, China Pavilion Town, Tai Ting Road, No. 6850 Patentee after: SHANGHAI KENT INSTRUMENT CO.,LTD. Address before: 201907 No. 5553 Hu Tai Road, Shanghai, Baoshan District Patentee before: SHANGHAI KENTE INTELLIGENT INS |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070613 Termination date: 20100605 |