EP3729006A1 - Magnetisch-induktives durchflussmessgerät - Google Patents
Magnetisch-induktives durchflussmessgerätInfo
- Publication number
- EP3729006A1 EP3729006A1 EP18819074.8A EP18819074A EP3729006A1 EP 3729006 A1 EP3729006 A1 EP 3729006A1 EP 18819074 A EP18819074 A EP 18819074A EP 3729006 A1 EP3729006 A1 EP 3729006A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- measuring tube
- coil
- measuring
- flowmeter
- degrees
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 230000001939 inductive effect Effects 0.000 title abstract description 3
- 230000004907 flux Effects 0.000 claims description 8
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 4
- 239000004020 conductor Substances 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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
- G01F1/584—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 electrodes, accessories therefor
-
- 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
-
- 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
- G01F1/60—Circuits therefor
-
- 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
- G01F1/588—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 combined constructions of electrodes, coils or magnetic circuits, accessories therefor
Definitions
- the invention relates to a magnetic-inductive flowmeter for measuring the
- volume flow or the flow rate of a flowing through a measuring tube medium
- Magnetic-inductive flowmeters are based on the measurement of an electrical voltage induced in a conductive medium by a magnetic field which is linearly dependent on the applied magnetic field and the volume flow of the medium through the measuring tube.
- the magnetic field is usually generated by means of a magnet system with at least one coil.
- a magnet system with at least one coil.
- DE102015122664A1 shows a magneto-inductive
- Flowmeter in which by means of two coils, a magnetic field is generated perpendicular to a Meßrohrachse, wherein coil axes are perpendicular to the Meßrohrachse.
- the magnetic field outside of the measuring tube and outside of the coils is conducted by means of a field guide between the two coils, wherein a magnetic connection between the coil core of a coil and field guide and between the measuring tube and coil core is made in each case by means of a pole piece. Since each connection in each case means an interruption of the magnetic flux, thus a performance of the flowmeter is reduced.
- concentrating the generation of the magnetic field on the area of the coils makes it necessary to use many turns of a coil wire in a narrow space. This leads to a poorer heat dissipation and a waste of precious raw materials, since many turns in a narrow space only through many layers of turns too
- the object of the invention is therefore to propose a magnetic-inductive flow meter, which at least mitigates at least one of the disadvantages mentioned.
- Volume flow or the flow rate of a medium flowing through a measuring tube comprises:
- the measuring tube with a measuring tube axis and a measuring tube wall
- a magnetic system for generating a magnetic field which magnetic field perpendicular to
- Measuring tube axis stands, wherein the magnet system is mounted on an outer side of the measuring tube; At least one pair of measuring electrodes, which measuring electrodes are capacitively or galvanically coupled to the medium located in the measuring tube, wherein the measuring electrodes are adapted to tap a voltage induced in the medium by the magnetic field, wherein a first measuring electrode of the pair of measuring electrodes on a first side of the measuring tube and a second measuring electrode of the pair of measuring electrodes is arranged on a second side of the measuring tube;
- the magnet system comprising: a coil system having at least one coil with a coil core; two pole shoes, which are arranged on opposite sides of the measuring tube, wherein the pole pieces configured to transfer the magnetic field generated by the coil system into the measuring tube and to receive the magnetic field penetrating the measuring tube and the
- the coil system comprises a device for field feedback, which device for field feedback is adapted to conduct the magnetic field outside the measuring tube between the pole shoes, characterized in that a tangential portion of the magnetic field in the coil with respect to the measuring tube axis at least 80% and in particular at least 90% of the total magnetic field, wherein the device for field feedback has at least one return part, which runs through at least one coil and respectively forms the coil core of the corresponding at least one coil.
- a measuring tube can be described by means of a cylindrically symmetrical coordinate system comprising a radial coordinate, an axial coordinate and a tangential coordinate.
- the tangential component of the magnetic field thus relates to the portion of the magnetic field which is aligned along the tangential coordinate.
- the return part comprises at least one layer of electrical steel which meets the requirements of the standard DIN EN 10106 edition 2007-1 1, or wherein the electrical sheet is particularly grain-oriented and meets the requirements of the standard DIN EN 10107 edition 2005-10, wherein the Grain orientation is parallel to the magnetic flux in the feedback part.
- a grain orientation of a magnetically conductive material provides for a non-isotropic magnetic conductivity, with a magnetic resistance of the material along the
- Com orientation is minimal.
- Magnet system can be reduced.
- the coil has at most 15 turn layers and in particular at most 10 turn layers and preferably at most 5 turn layers.
- an extension of the coil along its longitudinal axis with respect to the measuring tube axis an arc angle a of at least 2 degrees, and in particular at least 5 degrees and preferably at least 10 degrees. A larger extent contributes to the avoidance of turns.
- At least one coil with an associated return part is arranged on the first side and the second side of the measuring tube.
- a two-sided arrangement of coils and associated return parts contributes to a uniform magnetic flux in the pole pieces, resulting in a spatially homogeneous distribution of the magnetic field in the region of the measuring electrodes.
- the measuring tube has two end regions, a middle region and two intermediate regions along the measuring tube axis, wherein an intermediate region is in each case arranged between an end region and the middle region, the measuring tube each having a flange and a collar in its end regions, which flanges are arranged for this purpose are to be connected to a pipeline, wherein the at least one measuring electrode pair is arranged in the central region.
- the pole shoes and / or return parts and / or coils are each arranged symmetrically with respect to a transverse and / or longitudinal section of the measuring tube.
- a spatial distribution of the magnetic field in the region of the measuring electrodes can be made more homogeneous.
- the pole shoes in the central region with respect to the Meßrohrachse an arc angle 3M of at least 40 degrees and in particular at least 80 degrees and preferably at least 120 degrees, the pole pieces are separated by two gaps, each gap has a bow angle g of at least 5 degrees and more preferably at least 10 degrees and preferably at least 15 degrees.
- the distribution of the magnetic field in the measuring tube can be adjusted.
- Minimum expansion of the gap between the pole pieces helps to prevent a magnetic short circuit, which would hinder a magnetic flux in the measuring tube.
- the return part is arranged in the middle region and has in particular at least one passage for a Meßelektrodentitle ist and / or for casting, wherein the return part passes through at least one coil, and preferably by two coils, wherein the at least two coils with respect to the corresponding measuring electrode on
- the pole shoes in the intermediate areas each include one
- Arc angle ßz which arc angle ßz by at least 30 degrees and in particular at least 40 degrees and preferably at least 50 degrees smaller than the arc angle 3M, the field feedback on the first page and / or second page at least two
- Return parts has, which return parts the pole pieces in each one
- the magnet system has a shielding device, which is adapted to minimize magnetic interference of the flanges or collars, wherein the shielding device has at least one shielding band which surrounds the measuring tube circumferentially at least partially, wherein the shielding band between a flange and the central region or is arranged on a side facing the center region of the collar, wherein the shielding band is made of a magnetically conductive material, wherein the shielding band is made, for example, in one piece or from a plurality of subbands.
- the shielding device has two shielding bands, which are each assigned to a flange.
- the return part has at least 5 and in particular at least 10 and preferably at least 15 layers of electrical steel.
- the measuring tube has an inner diameter of at least 0.35 meters and in particular at least 1 meter and preferably at least 1.5 meters.
- the invention Especially with measuring tubes with large pipe diameters, the invention contributes to great advantages in terms of performance of the flowmeter.
- Fig. 1 outlines a typical magnetic inductive flowmeter according to the prior art
- Fig. 2 outlines a magnetic-inductive flowmeter according to the invention
- Fig. 3 a) to c) show schematic side views of alternative embodiments of a magnetic-inductive flowmeter according to the invention.
- the flowmeter comprises a measuring tube 10, measuring electrodes 30, and a magnet system with two coils 21.1 arranged on opposite sides of the measuring tube, each having a coil core 21.2, wherein in each case one pole piece 22 is adapted to conduct the magnetic field between the measuring tube and coil and to stamp out its spatial distribution in the measuring tube.
- the magnetic flux outside the measuring tube between the measuring tube facing away from the sides of the coil is accomplished by means of a field feedback.
- the magnetic flux is affected at the transitions between field feedback and coils, as well as coil and pole piece.
- several winding layers of coil wire necessary, which is disadvantageous for a consumption of coil wire and also problematic in terms of possible overheating of the coil.
- FIG. 2 outlines a schematic structure of an exemplary magnetic-inductive flow measuring device 1 according to the invention in a simplified cross-sectional drawing Center area 10.1 of the measuring tube.
- the flowmeter 1 has a measuring tube 10, a
- Magnetic system 20 a pair of measuring electrodes 30 disposed in the measuring tube, and an electronic measuring / operating circuit 40, which is adapted to operate the measuring electrodes 30 and the magnet system 20 and to provide flow measurements.
- electrical connections are shown between the measuring electrodes and the electronic measuring / operating circuit 40 and only between a coil and the electronic measuring / operating circuit 40.
- the magnet system 20 comprises a coil system 21 and two pole pieces 22 which are set up to conduct the magnetic field generated by the coil system between coil system 21 and measuring tube 10 and to stamp out the spatial distribution of the magnetic field in the measuring tube.
- the coil system comprises four coils 21.1, each with one
- Spool core 21.2 and a field feedback 21.3 with two return parts 21.4, which are arranged on opposite sides of the measuring tube and extend through two coils 21.1 and thus form the coil cores 21.2 of the associated coils.
- the pole shoes each have a thin metal sheet, and lie differently than in Fig. 2 shown on the
- the field feedback 21.3 is magnetically coupled in four contact areas K with the pole shoes 22, wherein the return parts 21.4 rest differently than in Fig. 2 on the pole shoes.
- the different representation is due to the recognizability of the individual components of the magnetic-inductive flowmeter. The decor of the
- Return parts 21.4 as coil cores 21.2 makes it possible to align the coils in a tangential direction to the measuring tube.
- an expansion of the coils along a coil axis can be increased and a number of winding layers can be reduced, resulting in a
- the expansion of the coil along its longitudinal axis has, with respect to the measuring tube axis 10.6, an arc angle a of at least 2 degrees, and in particular at least 5 degrees and preferably at least 10 degrees.
- an arc angle a of at least 2 degrees, and in particular at least 5 degrees and preferably at least 10 degrees.
- the pole shoes in the middle region 10.1 close with respect to the measuring tube axis 10.6
- Arc angle 3M of at least 40 degrees and in particular at least 80 degrees, and preferably at least 120 degrees, wherein the pole pieces are separated by two gaps, each gap includes a bow angle g of at least 5 degrees and in particular at least 10 degrees and preferably at least 15 degrees.
- the gaps are designed to avoid a magnetic short between the pole pieces.
- the return parts may have a lead-through for measuring electrode contacts (not shown).
- a magnetic-inductive flowmeter according to the invention is not limited to four coils and two feedback parts.
- a flow meter according to the invention can have n1 coils and n2 feedback parts, where n1 and n2 are natural numbers and n2 ⁇ n1 +1.
- FIG. 3 a) to c) show schematic side views of alternative exemplary embodiments of a magnet system of a magnetic-inductive flowmeter according to the invention, wherein FIG. 3 a) has a measuring tube 10 with a magnet system 20 arranged thereon in a central region of the measuring tube 10. 1, the magnet system on the side shown a coil system 21 with two pole pieces and a return part 21.4 of a field feedback 21.3 has.
- the field feedback part has a passage for a measuring electrode contacting 21.41 in a central area.
- the measuring tube has in end regions 10.3 in each case a flange 10.5 and a collar 10.4, wherein the flanges are adapted to
- Fig. 3 b shows a symmetrical with respect to a Meßrohrquerroughs magnet system, wherein the coil system shown in Fig. 3a) is made double and is arranged symmetrically with respect to the cross section.
- the electrical connection of the measuring electrodes 30 to the electronic measuring / operating circuit can be configured without a feedthrough 21.41 as shown in FIG. 3a).
- the flow of the magnetic field in the return parts is thus not hindered.
- only one coil 21.1 per return part 21.4 can be set up.
- Fig. 3 c shows another way to set up a magnetic system according to the invention, wherein the pole pieces in the intermediate regions 10.2 a smaller arc angle.
- the magnet system has a shielding device 23 comprising two shielding bands 23.1 on which sides of the collars or flanges are arranged on the coil system 21.
- the shielding bands have a magnetically conductive material and thereby reduce the propagation of the interference to the measuring electrodes.
- the magnet system preferably has at least one further coil and at least one further return part on the side of the measuring tube opposite the side shown, which are advantageously arranged symmetrically to a longitudinal section of the measuring tube to the coils shown and return parts.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Volume Flow (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017131202.1A DE102017131202A1 (de) | 2017-12-22 | 2017-12-22 | Magnetisch-induktives Durchflussmessgerät |
| PCT/EP2018/084182 WO2019121107A1 (de) | 2017-12-22 | 2018-12-10 | Magnetisch-induktives durchflussmessgerät |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3729006A1 true EP3729006A1 (de) | 2020-10-28 |
Family
ID=64664762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18819074.8A Withdrawn EP3729006A1 (de) | 2017-12-22 | 2018-12-10 | Magnetisch-induktives durchflussmessgerät |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11473948B2 (de) |
| EP (1) | EP3729006A1 (de) |
| CN (1) | CN111566454A (de) |
| DE (1) | DE102017131202A1 (de) |
| WO (1) | WO2019121107A1 (de) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019123409A1 (de) * | 2019-09-02 | 2021-03-04 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
| DE102019123528B4 (de) | 2019-09-03 | 2024-05-08 | Krohne Ag | Magnetisch-induktives Durchflussmessgerät und Magnetkreisvorrichtung |
| DE102019133460A1 (de) | 2019-12-06 | 2021-06-10 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
| DE102020112129B3 (de) | 2020-05-05 | 2021-09-30 | Endress+Hauser Flowtec Ag | Magnetisch-induktive Durchflussmessvorrichtung und Verfahren zum Ermitteln eines Füllstandes |
| DE102020114056A1 (de) | 2020-05-26 | 2021-12-02 | Krohne Ag | Magnetkreisvorrichtung für ein magnetisch-induktives Durchflussmessgerät und Verfahren zur Fertigung einer Magnetkreisvorrichtung |
| DE102020114034A1 (de) | 2020-05-26 | 2021-12-02 | Krohne Ag | Magnetisch-induktives Durchflussmessgerät und Messrohr für ein magnetisch-induktives Durchflussmessgerät |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1095915A (en) * | 1965-03-24 | 1967-12-20 | George Kent Stroud Ltd | Improvements in or relating to flowmeters |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1260840A (en) * | 1968-05-10 | 1972-01-19 | Nat Res Dev | Improvements relating to fluid flow meters |
| US3633401A (en) * | 1969-07-03 | 1972-01-11 | Tokyo Shibaura Electric Co | Method and apparatus for checking electromagnetic flowmeters |
| US4459857A (en) | 1982-06-16 | 1984-07-17 | Rosemount Inc. | Electromagnetic flowmeter |
| JPS60173024U (ja) * | 1984-04-26 | 1985-11-16 | 株式会社東芝 | 電磁流量計 |
| DE3501768A1 (de) | 1985-01-21 | 1986-07-24 | Danfoss A/S, Nordborg | Elektromagnetischer durchflussmesser |
| EP0649005B1 (de) * | 1993-10-14 | 1997-04-23 | Endress + Hauser Flowtec AG | Magnetisch-induktive Durchflussaufnehmer |
| DE19958285C2 (de) | 1999-12-03 | 2002-05-02 | Krohne Ag Basel | Magnetisch-induktives Durchflussmessgerät |
| DE102011079352A1 (de) * | 2011-07-18 | 2013-01-24 | Endress + Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
| DE202012104036U1 (de) * | 2012-10-19 | 2014-01-20 | Endress + Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
| DE102015120730A1 (de) | 2015-11-30 | 2017-06-01 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät und Anordnung umfassend eine Rohrleitung und ein magnetisch-induktives Durchflussmessgerät |
| DE102015122664B4 (de) | 2015-12-23 | 2021-12-02 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
| DE102017115155B4 (de) * | 2017-07-06 | 2022-02-24 | Endress+Hauser Flowtec Ag | Magnetisch-induktives Durchflussmessgerät |
-
2017
- 2017-12-22 DE DE102017131202.1A patent/DE102017131202A1/de not_active Withdrawn
-
2018
- 2018-12-10 US US16/956,969 patent/US11473948B2/en active Active
- 2018-12-10 CN CN201880081446.8A patent/CN111566454A/zh active Pending
- 2018-12-10 EP EP18819074.8A patent/EP3729006A1/de not_active Withdrawn
- 2018-12-10 WO PCT/EP2018/084182 patent/WO2019121107A1/de not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1095915A (en) * | 1965-03-24 | 1967-12-20 | George Kent Stroud Ltd | Improvements in or relating to flowmeters |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019121107A1 (de) | 2019-06-27 |
| DE102017131202A1 (de) | 2019-06-27 |
| US11473948B2 (en) | 2022-10-18 |
| CN111566454A (zh) | 2020-08-21 |
| US20200393276A1 (en) | 2020-12-17 |
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