WO2016041725A1 - Débitmètre magnéto-inductif muni d'un système magnétique comportant au moins quatre bobines - Google Patents

Débitmètre magnéto-inductif muni d'un système magnétique comportant au moins quatre bobines Download PDF

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Publication number
WO2016041725A1
WO2016041725A1 PCT/EP2015/069054 EP2015069054W WO2016041725A1 WO 2016041725 A1 WO2016041725 A1 WO 2016041725A1 EP 2015069054 W EP2015069054 W EP 2015069054W WO 2016041725 A1 WO2016041725 A1 WO 2016041725A1
Authority
WO
WIPO (PCT)
Prior art keywords
coils
measuring tube
measuring
coil
return plates
Prior art date
Application number
PCT/EP2015/069054
Other languages
German (de)
English (en)
Inventor
Oliver Graf
Thomas Zingg
Original Assignee
Endress+Hauser Flowtec Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Endress+Hauser Flowtec Ag filed Critical Endress+Hauser Flowtec Ag
Publication of WO2016041725A1 publication Critical patent/WO2016041725A1/fr

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Classifications

    • 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
    • G01F1/56—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 using electric or magnetic effects
    • G01F1/58—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 using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/586—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 using electric or magnetic effects by electromagnetic flowmeters constructions of coils, magnetic circuits, accessories therefor

Definitions

  • the invention relates to a device for measuring the flow of a flowing fluid through a measuring tube after the magnetic-inductive
  • Magnetic-inductive flowmeters are widely used in process and automation technology for fluids with an electrical conductivity of about 5pS / cm.
  • Corresponding flow measuring devices are sold by the applicant in various embodiments for various applications, for example, under the name PROMAG.
  • the measuring principle is based on Faraday 's law of magnetic induction and is known from various publications.
  • Measuring section fixed magnet system is generated substantially perpendicular to the flow direction of the conductive fluid, a magnetic field of constant time strength. As a result, the ions present in the flowing fluid in
  • the electrical voltage generated by this charge separation is also by means of at least one in the
  • Tapping section attached measuring electrode pair tapped.
  • the tapped voltage is proportional to the flow rate of the fluid and thus proportional to the volume flow.
  • the measuring accuracy of a magnetic-inductive flowmeter depends on many different factors. Some of them concern the
  • Embodiment of the magnet system or the reading of the measuring signal on the at least one measuring electrode pair and its geometry. Furthermore, the measurement performance and accuracy have a sensitive dependence on the prevailing flow profile of the fluid.
  • DE1648143 describes a magnet system in which pin-like formations for attaching the coils are provided on a coil core in the form of a circumferential ring.
  • DE202012104036U1 discloses a modular magnet system with at least four coils, which are arranged circumferentially distributed to the measuring tube on pole shoes. The division of the coil arrangement serves to reduce stray fields.
  • the present invention has for its object to provide a device for
  • each of the at least four coils are arranged together with at least one of the at least two pole pieces such that in the region of each of the two ends of a pole piece in each case at least one coil is arranged, at least four from each other and at least two pole shoes spatially separated return plates, wherein each two return plates on either side of one of the at least two pole pieces are arranged mirror-symmetrically to each other such that each of the at least two return plates a first coil, which is arranged in the region of a first of the at least two pole pieces, and a second coil, which is arranged in the region of a second of the at least two pole pieces , magnetically coupled with each other.
  • either each of the at least four coils can have at least one coil core.
  • two or more coils may share a common coil core. The direct arrangement of the coils, pole pieces and return plates on the measuring tube significantly reduces the material requirements for these components. Furthermore, the
  • Attachment to the measuring tube particularly simple and at the same time very stable. Despite the reduction of manufacturing costs, a high accuracy of measurement can be achieved because disturbing stray fields can be minimized.
  • a direct arrangement means that the components are arranged directly on the measuring tube.
  • the at least two pole shoes and / or the at least four return plates are made of a soft magnetic material.
  • the measuring tube consists of a metal, which is lined in the fluid-contacting region with an electrically insulating liner.
  • the measuring tube can also consist of a ceramic or a plastic, wherein the at least two pole pieces and / or the at least two return plates are arranged on the outer surface of the measuring tube, or embedded in the measuring tube.
  • a housing made of a metal, preferably with a magnetic shielding effect, is provided. In this way, further disturbances can be eliminated.
  • each of the at least four coils has the same geometry, in particular a non-saddle-shaped planar geometry.
  • planar coils advantageously reduces the cost of copper in terms of cost.
  • each of the at least four coils is of the same type. This simplifies the construction and assembly.
  • the return plates and pole shoes in the form of rectangular curved plates, wherein the curvature of the
  • Measuring tube is adapted. It is advantageous if in each case a pole piece and two return plates are made of a rectangular sheet such that the return plates in the form of rectangular strips whose length is smaller than that of the sheet, cut on both sides along the longitudinal axis of the sheet starting from the center become. This further reduces the material requirements and, correspondingly, the production costs, since both components can be manufactured from the same metal sheet.
  • exactly four coils, exactly two pole shoes and exactly four return plates are provided. This choice is particularly suitable for smaller sizes. It is advantageous if the coils have coil cores with an H-shape. This simplifies the production of a magnetic coupling by means of
  • At least eight coils, exactly two pole shoes and exactly four return plates are provided.
  • each of the at least eight coils advantageously has an L-shaped coil core. Such an arrangement is particularly suitable for larger sizes.
  • each of the two pole shoes has a coil arranged on both sides at each of the two ends, wherein the axis through the two coils runs essentially parallel to the axis of the measuring tube.
  • the magnet system according to the invention with the at least four coils is characterized in that for a large range for the nominal diameter of the measuring tube in each case the same coil can be used with the same dimensions.
  • the width of the pole shoes and return plates must be varied. This brings next to a reduction in the number of components that need to be custom-made for each nominal size, also savings in relation to the need for copper.
  • the entire construction is particularly simple in construction and easy to assemble.
  • a large part of the units and / or components used for fastening the magnet system are eliminated, which causes a further reduction of the manufacturing costs.
  • Fig. 1 a magnetic-inductive flowmeter according to the prior art
  • Fig. 2 an embodiment of a magnet system with four coils
  • FIG 3 shows an embodiment of a magnet system with eight coils
  • FIG. 4 is a pole piece and two return plates, which are made of a single sheet.
  • FIG. 1 shows a magnetic-inductive flow meter 1 for measuring the flow of a flowing fluid 2 through a measuring tube 3.
  • Measuring tube 3 is made of either a metal, in particular stainless steel, and in the fluid-facing region, d. H. on the inside over the entire length, provided with an electrically insulating liner 4. It goes without saying, however, that the measuring tube can also be made of a suitable ceramic, in particular aluminum oxide, or of a plastic, for example hard rubber.
  • the sensor unit are at least two measuring electrodes 8,8a for
  • the magnet system 9 comprises at least two coils 10, 10a [not shown here] for generating the magnetic field 11 and possibly also pole shoes 12, 12a [not shown here] for realizing an advantageous spatial distribution and / or return plates 13, 13a, 13b, 13c [also not shown here].
  • the magnet system 9 comprises at least two coils 10, 10a [not shown here] for generating the magnetic field 11 and possibly also pole shoes 12, 12a [not shown here] for realizing an advantageous spatial distribution and / or return plates 13, 13a, 13b, 13c [also not shown here].
  • Measuring electrodes 8,8a are each positioned on opposite sides of the measuring tube 3.
  • the sensor unit is usually at least partially surrounded by a housing 5.
  • an electronics unit 6 is further provided which is electrically connected via a connecting cable 7 to the field device 1.
  • the electronics unit serves the
  • Fig. 2 is a first embodiment of an inventive
  • Magnetic system 9 ' shown with four coils 10,10a, 10b, 10c, once in a two-dimensional a) and once in a three-dimensional b) view.
  • the measuring tube 3 is also drawn, since the magnet system 9 'is attached directly thereto.
  • the four coils 10, 10a10b, 10c are arranged circumferentially distributed on the measuring tube 3, wherein each two of the four coils 10,10b and 10a, 10c are opposite.
  • the angle ⁇ between the virtual connecting lines through each Coils arranged on opposite sides can vary from application to application.
  • the coils 10, 10 a, 10 b, 10 c are preferably planar non-saddle-shaped coils with coil cores 14, 14 a, 14 b, 14 c.
  • Each of the four coils 10, 10a, 10b, 10c has its own coil core 14, 14a, 14b, 14c.
  • the magnet system 9 also has two pole shoes 12, 12a and four return plates 13, 13a, 13b, 13c, which are each manufactured from bent metal sheets of rectangular basic shape, and the like
  • Curvature is adapted to that of the measuring tube 3.
  • the pole pieces 12, 12a are arranged relative to their center on opposite sides of the measuring tube. The exact positioning of the pole pieces 12, 12a and return plates
  • FIG. 2b Two coils 10, 10a each are arranged in the end regions of one of the pole shoes 12. Similarly, although not shown, the coils 10b, 10c are disposed in the end portions of the pole piece 12a. Thus, the coils 10 and 10b and 10a and 10c are opposite.
  • a second embodiment is the subject of Fig. 3, again in a two-dimensional a) and three-dimensional b) view.
  • the magnet system 9 "has eight coils 10, 10.1, 10a, 10a.1, 10b, 10b.1, 10c, 10c.1, two coils each forming one unit, each of the eight coils 10, 10.1, 10a , 10a.1, 10b, 10b.1, 10c, 10c.1 has a separate coil core
  • the arrangement of the pole shoes 12, 12a and the return plates 13, 13a, 13b, 13c is substantially analogous to that shown in FIG. Therefore, the following description focuses only on the differences with respect to the coils, which can be seen from the three-dimensional view in Fig. 3b.
  • the return plate 13 magnetically couples the coils 10 and 10c with each other, and the return plate 13a, the two coils 10.1 and 10c.1.
  • the two coils 10a and 10a.1 are magnetically coupled to the coils 10b and 10b.1 by means of the return plates 13b, 13c, which are not visible here.
  • either the return plates 13, 13a, 13b, 13c and pole shoes 12, 12a can each be manufactured from separate metal sheets.
  • a pole piece 12 and two return plates 13, 13 a can also be produced from a single metal sheet, as shown in FIG. 4.
  • the latter variant is particularly material-and accordingly also cost-saving.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un dispositif permettant de mesurer selon le principe magnéto-inductif le débit d'un fluide (2) s'écoulant dans une conduite, le dispositif comportant un tube de mesure (3) et au moins deux électrodes de mesure (8, 8a) servant à saisir une tension induite. Sur ou dans le tube de mesure (3) sont agencés en direction circonférentielle des composants servant à produire un champ magnétique (11) traversant le tube de mesure perpendiculairement à la direction d'écoulement du fluide (2) et perpendiculairement à une ligne de raccordement entre les deux ou plus de deux électrodes (8, 8a). Le dispositif comprend au moins quatre bobines (10, 10a, 10b, 10c) munies d'un noyau de bobine (14, 14a, 14b, 14c), au moins deux masses polaires (12, 12a) séparées l'une de l'autre dans l'espace et agencées sur des côtés opposés du tube de mesure (3) par rapport à leur point médian, et au moins deux bobines (10, 10a, 10b, 10c) étant agencées avec au moins une des deux ou plus de deux masses polaires (12, 12a) de telle manière qu'au moins une bobine (10, 10a, 10b, 10c) est agencée dans la zone de chacune des deux extrémités d'une masse polaire (12, 12a). Le dispositif comprend au moins quatre tôles de retour (13, 13a, 13b, 13c) séparées l'une de l'autre et séparées des deux ou plus de deux masses polaires (12, 12a) dans l'espace, deux tôles de retour (13, 13a, 13b, 13c) étant respectivement agencées de chaque côté d'une des deux ou plus de deux masses polaires (12, 12a) en symétrie de miroir de telle manière que chacune des deux ou plus de deux tôles de retour (13, 13a, 13b, 13c) raccorde magnétiquement l'une à l'autre une première bobine (10, 10a, 10b, 10c) qui est agencée dans la zone d'une première des deux ou plus de deux masses polaires (12, 12a) et une deuxième bobine (10, 10a, 10b, 10c) qui est agencée dans la zone d'une deuxième des deux ou plus de deux masses polaires (12, 12a).
PCT/EP2015/069054 2014-09-17 2015-08-19 Débitmètre magnéto-inductif muni d'un système magnétique comportant au moins quatre bobines WO2016041725A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014113409.5A DE102014113409A1 (de) 2014-09-17 2014-09-17 Magnetisch-induktives Durchflussmessgerät mit einem Magnetsystem mit mindestens vier Spulen
DE102014113409.5 2014-09-17

Publications (1)

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WO2016041725A1 true WO2016041725A1 (fr) 2016-03-24

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WO (1) WO2016041725A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019123409A1 (de) * 2019-09-02 2021-03-04 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102019123413A1 (de) * 2019-09-02 2021-03-04 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102019133460A1 (de) 2019-12-06 2021-06-10 Endress+Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1911556A1 (de) * 1969-03-07 1970-09-24 Krohne Fa Ludwig Induktiver Stroemungsmesser
EP0233084A2 (fr) * 1986-02-14 1987-08-19 Aichi Tokei Denki Co., Ltd. Débitmètre électromagnétique
EP0649005A1 (fr) * 1993-10-14 1995-04-19 Endress + Hauser Flowtec AG Capteurs de débimètre électromagnétique
US20120047987A1 (en) * 2010-08-30 2012-03-01 Kabushiki Kaisha Toshiba Electromagnetic flow rate measurement system and calibrator therefor
DE102011083549A1 (de) * 2011-09-27 2013-03-28 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE202012104036U1 (de) * 2012-10-19 2014-01-20 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
US20140083199A1 (en) * 2012-09-26 2014-03-27 Rosemount Inc. Magnetic flowmeter with multiple coils

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490282A (en) 1966-07-28 1970-01-20 Tokyo Shibaura Electric Co Induction liquid flowmeters
JPS60173024U (ja) 1984-04-26 1985-11-16 株式会社東芝 電磁流量計
DE102011079351A1 (de) 2011-07-18 2013-01-24 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
DE102012014266A1 (de) * 2012-07-19 2014-01-23 Krohne Ag Magnetisch-induktives Durchflussmessgerät

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1911556A1 (de) * 1969-03-07 1970-09-24 Krohne Fa Ludwig Induktiver Stroemungsmesser
EP0233084A2 (fr) * 1986-02-14 1987-08-19 Aichi Tokei Denki Co., Ltd. Débitmètre électromagnétique
EP0649005A1 (fr) * 1993-10-14 1995-04-19 Endress + Hauser Flowtec AG Capteurs de débimètre électromagnétique
US20120047987A1 (en) * 2010-08-30 2012-03-01 Kabushiki Kaisha Toshiba Electromagnetic flow rate measurement system and calibrator therefor
DE102011083549A1 (de) * 2011-09-27 2013-03-28 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät
US20140083199A1 (en) * 2012-09-26 2014-03-27 Rosemount Inc. Magnetic flowmeter with multiple coils
DE202012104036U1 (de) * 2012-10-19 2014-01-20 Endress + Hauser Flowtec Ag Magnetisch-induktives Durchflussmessgerät

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