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WO2016009696A1 - Débitmètre électromagnétique et noyau - Google Patents

Débitmètre électromagnétique et noyau Download PDF

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Publication number
WO2016009696A1
WO2016009696A1 PCT/JP2015/062297 JP2015062297W WO2016009696A1 WO 2016009696 A1 WO2016009696 A1 WO 2016009696A1 JP 2015062297 W JP2015062297 W JP 2015062297W WO 2016009696 A1 WO2016009696 A1 WO 2016009696A1
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WO
WIPO (PCT)
Prior art keywords
core
magnetic field
flow meter
fluid
electrodes
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.)
Ceased
Application number
PCT/JP2015/062297
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English (en)
Japanese (ja)
Inventor
公一 木村
彰宏 牧野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tohoku University NUC
Aichi Tokei Denki Co Ltd
Original Assignee
Tohoku University NUC
Aichi Tokei Denki Co Ltd
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 Tohoku University NUC, Aichi Tokei Denki Co Ltd filed Critical Tohoku University NUC
Publication of WO2016009696A1 publication Critical patent/WO2016009696A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals

Definitions

  • the technology disclosed in this specification relates to an electromagnetic flow meter and a core.
  • an electromagnetic flow meter includes an exciting coil that generates a magnetic field when energized, and a core made of a magnetic material disposed at the center of the exciting coil.
  • the electromagnetic flow meter is disposed in a magnetic field generated by the excitation coil, and is opposed to the measurement tube in which the fluid flows inside, in the direction perpendicular to the direction of the magnetic field generated in the excitation coil and the direction of the fluid flowing in the measurement tube.
  • a pair of electrodes arranged (see, for example, Japanese Patent Application Laid-Open No. 2007-333392).
  • the square ratio (residual magnetic flux density / saturated magnetic flux density) is close to 1 as the magnetic material used for the core at the center of the exciting coil of the residual excitation type electromagnetic flowmeter.
  • a method of controlling the direction of the magnetization easy axis of the crystal in the magnetic material is used.
  • it was necessary to go through a process such as in a magnetic field or rolling.
  • processes such as a melting process, a forging process, a rolling process, and a cutting process, and many processes and complicated controls are required. Therefore, since the core of the conventional electromagnetic flowmeter requires many processes and complicated control, it is not suitable for production in a small lot, and the core must be produced in a large lot. Also, the cost was high when trying to produce cores in small lots.
  • the present specification aims to provide a technology capable of producing a high quality product in a small lot when producing a core.
  • the core of the exciting coil has a composition represented by any of the following composition formulas (1) to (5), and nanocrystal grains are dispersed in an amorphous phase.
  • Fe a -Si b -B c -P d -Cu e (70 ⁇ a ⁇ 90 at%, 8.0 ⁇ b + c ⁇ 26 at%, 8.0 ⁇ c ⁇ 25 at%, 0.20 ⁇ d ⁇ 5 .0at%, 0 ⁇ e ⁇ 2.0at%)
  • Fe a -Si b -B c -P d 70 ⁇ a ⁇ 90 at%, 1.0 ⁇ b ⁇ 20 at%, 1.0 ⁇ c ⁇ 25 at%, 0 ⁇ d ⁇ 10 at%)
  • Fe a -Si b -B c -Cu e (70 ⁇ a ⁇ 90 at%, 1.0 ⁇ b ⁇ 20 at%, 1.0 ⁇ c
  • the core can be produced without requiring many processes and complicated control as in the prior art. Therefore, it is not necessary to produce in a large lot in order to reduce costs, and it is possible to produce in a small lot. Further, the squareness ratio of the magnetic material can be increased without performing many steps and complicated control. Therefore, high quality cores can be produced in small lots.
  • the core may be formed by heating an amorphous alloy.
  • the residual magnetic flux density of the core may be 1.2 T or more.
  • BH curve magnetic hysteresis curve
  • the core may be a laminate of a plurality of sheet materials.
  • Each sheet material may be solidified in an amorphous state by cooling the molten metal.
  • Each sheet material may be solidified in an amorphous state by discharging molten metal onto a metal roll and cooling it.
  • the core of an electromagnetic flow meter using an alternating magnetic field may be used.
  • the electromagnetic flow meter 1 includes an excitation coil 10 and a core 20 disposed at the center of the excitation coil 10.
  • the electromagnetic flow meter 1 includes a measurement tube 30 and a pair of electrodes 40 and 40 fixed to the measurement tube 30.
  • a yoke 60 is disposed between the exciting coil 10 and the measuring tube 30.
  • the exciting coil 10 is wound around the core 20.
  • a hole 11 is formed at the center of the exciting coil 10.
  • a core 20 is inserted into the hole 11 of the exciting coil 10.
  • the exciting coil 10 surrounds the core 20.
  • the exciting coil 10 is formed by winding a metal conducting wire 12.
  • the conducting wire 12 is connected to a power source (not shown). That is, the exciting coil 10 is connected to a power source (not shown).
  • a magnetic field is generated by energization.
  • a current flows from the power source (not shown) to the exciting coil 10 a magnetic field is generated.
  • the core 20 disposed in the hole 11 of the exciting coil 10 is magnetized.
  • the magnetization direction of the core 20 when a current is passed through the excitation coil 10 depends on the direction of the current flowing through the excitation coil 10.
  • an alternating magnetic field whose magnitude and direction change with time is used.
  • magnetic flux generated by energization of the exciting coil 10 passes through the core 20.
  • a yoke 60 that guides the magnetic flux is fixed to both end portions 22 of the core 20.
  • the yoke 60 is disposed between the core 20 and the measuring tube 30. One end 61 of the yoke 60 is in contact with the core 20. The other end 62 of the yoke 60 extends toward the measurement tube 30 and is in contact with the measurement tube 30. The yoke 60 guides the magnetic flux from the core 20 to the measuring tube 30. The other end portion 62 of the upper yoke 60 and the other end portion 62 of the lower yoke 60 face each other with the measurement tube 30 in between. A magnetic field is formed between the other end portion 62 of the upper yoke 60 and the other end portion 62 of the lower yoke 60.
  • the other end 62 of the upper yoke 60 and the other end 62 of the lower yoke 60 face each other in a direction orthogonal to the fluid flow direction (the direction in which the measurement tube 30 extends). As a result, a magnetic field is generated in a direction orthogonal to the fluid flow direction (the direction in which the measurement tube 30 extends).
  • the yoke 60 is made of a soft magnetic material. Examples of the soft magnetic material include iron and ferrite.
  • the core 20 includes a plurality of sheet materials 21.
  • a core 20 is formed by a plurality of laminated sheet materials 21. That is, the core 20 is a stacked body of a plurality of sheet materials 21. Each sheet material 21 is formed in a plate shape or a ribbon shape.
  • the sheet material 21 is formed from a semi-rigid magnetic material. Therefore, the core 20 formed of the plurality of sheet materials 21 is formed of a semi-rigid magnetic material. In the semi-rigid magnetic material, the magnetization direction changes according to the direction of the magnetic field.
  • the magnetic material examples include Fe—Si—BP—Cu, Fe—Si—BP, Fe—Si—B—Cu, Fe—Si—B—Nb—Cu, Fe— Examples include Si-B alloys. More specifically, the core 20 is formed of an alloy having a composition represented by any of the following composition formulas (1) to (5).
  • Fe a -Si b -B c -P d -Cu e (70 ⁇ a ⁇ 90 at%, 8.0 ⁇ b + c ⁇ 26 at%, 8.0 ⁇ c ⁇ 25 at%, 0.20 ⁇ d ⁇ 5 0.0 at%, 0 ⁇ e ⁇ 2.0 at%), more preferably (73 ⁇ a ⁇ 85 at%, 9.65 ⁇ b + c ⁇ 24.75 at%, 9.65 ⁇ c ⁇ 22 at%, 0.25 ⁇ d ⁇ 5 at%, 0 ⁇ e ⁇ 0.35 at%, 0 ⁇ y / x ⁇ 0.5)
  • Fe a -Si b -B c -P d (70 ⁇ a ⁇ 90 at%, 1.0 ⁇ b ⁇ 20 at%, 1.0 ⁇ c ⁇ 25 at%, 0 ⁇ d ⁇ 10 at%)
  • the semi-hard magnetic material alloy used for the core 20 includes an amorphous phase and nanocrystal grains. That is, when the cross section of the alloy of the semi-hard magnetic material used for the core 20 is observed, nanocrystal grains are dispersed in the amorphous phase. In the amorphous phase, atoms are arranged irregularly. Nanocrystal grains have a crystal structure of several to several tens of nanometers, and atoms are regularly arranged in the crystal part.
  • the saturation magnetic flux density of the magnetic material used for the core 20 is preferably 1.5 T (tesla) or more, and more preferably 1.6 T (tesla) or more. Further, the residual magnetic flux density of the magnetic material used for the core 20 is preferably 1.2 T (tesla) or higher, and more preferably 1.3 T (tesla) or higher.
  • the holding force of the magnetic material used for the core 20 is preferably 40 to 8000 A / m.
  • An alloy of a semi-hard magnetic material used for the core 20 can be obtained by heat-treating an amorphous alloy having the above composition formula.
  • an amorphous alloy before heating there are no nanocrystal grains, only an amorphous phase exists, and atoms are arranged irregularly.
  • an alloy of a semi-hard magnetic material including an amorphous phase and nanocrystal grains can be obtained.
  • the molten metal having the above composition formula is discharged onto a metal roll, and the molten metal is cooled.
  • the cooled molten metal solidifies in an amorphous state.
  • a plurality of sheet materials 21 are formed by dividing the molten metal that has been solidified by cooling.
  • the core 20 is formed by laminating a plurality of sheet materials 21.
  • the measuring tube 30 has a circular cross section.
  • An insulating lining is formed on the inner surface of the measuring tube 30.
  • the inside of the measuring tube 30 is filled with fluid.
  • a fluid flows inside the measurement tube 30.
  • An example of the fluid is water.
  • the measurement tube 30 extends between the other end 62 of the upper yoke 60 and the other end 62 of the lower yoke 60.
  • the measuring tube 30 is disposed in a magnetic field generated by the exciting coil 10.
  • the fluid flows in the magnetic field generated by the exciting coil 10.
  • the measurement tube 30 is disposed so as to extend in a direction orthogonal to the magnetic field direction.
  • the pair of electrodes 40, 40 fixed to the measuring tube 30 face each other.
  • the pair of electrodes 40, 40 oppose each other in a direction orthogonal to the direction of the fluid flowing through the measurement tube 30 (the direction in which the measurement tube 30 extends).
  • the pair of electrodes 40, 40 face each other in a direction orthogonal to the direction in which the other end portion 62 of the upper yoke 60 and the other end portion 62 of the lower yoke 60 face each other. That is, the pair of electrodes 40 and 40 face each other in a direction orthogonal to the direction of the magnetic field.
  • the electrode 40 is exposed inside the measuring tube 30.
  • the electrode 40 contacts the fluid in the measurement tube 30.
  • the pair of electrodes 40, 40 are opposed to each other with the fluid in the measurement tube 30 interposed therebetween. A fluid flows between the pair of electrodes 40.
  • the pair of electrodes 40 and 40 are connected to the control device 70.
  • the pair of electrodes 40, 40 are energized via the fluid flowing through the measuring tube 30.
  • an electromotive force is generated between the pair of electrodes 40 due to the movement of the fluid.
  • the control device 70 measures an electromotive force generated between the pair of electrodes 40 and 40, and calculates a fluid flow rate based on the measured electromotive force.
  • the calculation of the flow rate of the fluid is based on Faraday's law of electromagnetic induction, namely, “When a conductor (fluid in this embodiment) moves in a magnetic field, an electromotive force is generated in the direction perpendicular to both the magnetic field direction and the moving direction through the conductor Can be implemented based on the law that "is generated and its magnitude is proportional to magnetic flux density and speed". Since a calculation method for calculating the flow rate of the fluid based on the electromotive force is known, a detailed description thereof will be omitted.
  • the electromagnetic flow meter 1 having the above-described configuration, when a power source connected to the excitation coil 10 is turned on, a current flows through the excitation coil 10 to generate a magnetic field.
  • a magnetic field is generated, the magnetic flux in this magnetic field passes through the core 20 disposed at the center of the exciting coil 10 and the yoke 60 connected to the core 20.
  • a magnetic field is formed between the other end portion 62 of the upper yoke 60 and the other end portion 62 of the lower yoke 60.
  • the measuring tube 30 is disposed in a magnetic field formed between the upper yoke 60 and the lower yoke 60, and the fluid flows in the measuring tube 30. Thereby, the fluid flows in the magnetic field generated by the exciting coil 10.
  • the fluid flows in a direction orthogonal to the magnetic field direction.
  • an electromotive force is generated between the pair of electrodes 40 due to the movement of the fluid.
  • the electromotive force is generated in a direction perpendicular to the direction of the magnetic field and the direction of fluid flow.
  • the control device 70 connected to the electrode 40 measures the electromotive force, and calculates the flow rate of the fluid flowing through the measuring tube 30 based on the electromotive force. In this way, the fluid flow rate can be measured.
  • the core 20 includes an alloy represented by any one of the composition formulas (1) to (5), and the alloy is amorphous. Nanocrystal grains are dispersed in the phase.
  • the core 20 in order to increase the squareness ratio of the magnetic material, it is necessary to perform a process of heat-treating the magnetic material in a magnetic field, a process such as a melting process, a forging process, a rolling process, and a cutting process. It required many processes and complicated controls to produce.
  • the core 20 can be produced without requiring such many steps and complicated control.
  • the squareness ratio of the magnetic material can be increased without performing many steps and complicated control. Therefore, the high quality core 20 can be produced in a small lot.
  • the core 20 can be manufactured only by heat-treating the amorphous alloy, many processes and complicated control are not required, and the cost can be reduced. Moreover, according to said structure, since the residual magnetic flux density of the core 20 is 1.2 T (Tesla) or more, the magnetic field produced by energization of the exciting coil 10 becomes strong. Thereby, since a strong magnetic field acts on the fluid flowing through the measurement tube 30, the measurement accuracy of the electromagnetic flow meter 1 is increased. Further, in the conventional technique, in order to obtain measurement accuracy equivalent to that of the core 20 described above, it is necessary to increase the current flowing through the exciting coil to increase the magnetic field, resulting in an increase in power consumption. However, with the core 20 described above, measurement accuracy can be increased with less power consumption.
  • the yoke 60 is disposed above and below the measurement tube 30, and the magnetic field generated by one excitation coil 10 acts on the fluid in the measurement tube 30 via the yoke 60.
  • the present invention is not limited to this configuration.
  • the excitation coil 10 may be disposed above and below the measurement tube 30, and the magnetic field generated by the two excitation coils 10 may act on the fluid in the measurement tube 30.
  • the measurement tube 30 had a circular cross section, it is not limited to this structure, The measurement tube 30 may have a rectangular cross section.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre électromagnétique (1) équipé d'une bobine (10) d'excitation qui génère un champ magnétique lorsqu'elle est alimentée, et d'un noyau (20) comportant un matériau magnétique disposé dans la partie centrale de la bobine (10) d'excitation. Le débitmètre électromagnétique (1) est également équipé d'un conduit (30) de mesure disposé à l'intérieur du champ magnétique généré par la bobine (10) d'excitation, et à l'intérieur duquel s'écoule un fluide, et d'une paire d'électrodes (40) fixées au conduit (30) de mesure de façon à se faire face dans une direction orthogonale à la direction du champ magnétique généré par la bobine (10) d'excitation et à la direction d'écoulement du fluide dans le conduit (30) de mesure. Le débit volumique du fluide est mesuré sur la base de la force électromotrice générée entre les électrodes de la paire d'électrodes (40) lorsqu'un fluide s'écoule entre les électrodes de la paire d'électrodes (40). Le noyau (20) contient un alliage représenté par la formule de composition Fea - Sib - Bc - Pd - Cue (où 70≤a≤90% at., 8.0≤b+c≤26% at., 8.0≤c≤25% at., 0.20≤d≤5.0% at., et 0<e≤2.0% at.), et ledit alliage comprend une phase amorphe et une phase nano-cristalline.
PCT/JP2015/062297 2014-07-14 2015-04-22 Débitmètre électromagnétique et noyau Ceased WO2016009696A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014144311A JP2016020835A (ja) 2014-07-14 2014-07-14 電磁流量計およびコア
JP2014-144311 2014-07-14

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WO2016009696A1 true WO2016009696A1 (fr) 2016-01-21

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WO (1) WO2016009696A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111636039A (zh) * 2020-05-11 2020-09-08 北京科技大学 一种高饱和磁化强度Fe-B-P-C-Cu-M系非晶纳米晶软磁合金及制备方法

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WO2007032531A1 (fr) * 2005-09-16 2007-03-22 Hitachi Metals, Ltd. Alliage magnétique nanocristallin, son procédé de production, bande mince d’alliage, et composant magnétique
JP2007270271A (ja) * 2006-03-31 2007-10-18 Hitachi Metals Ltd 軟磁性合金、その製造方法ならびに磁性部品
JP2007333392A (ja) * 2006-06-12 2007-12-27 Yokogawa Electric Corp 電磁流量計
WO2008129803A1 (fr) * 2007-03-20 2008-10-30 Nec Tokin Corporation Alliage magnétique doux, élément magnétique doté de cet alliage et leurs procédés de production

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JP2000252107A (ja) * 1999-03-02 2000-09-14 Sumitomo Special Metals Co Ltd 高磁束密度の半硬質磁性材料およびその製造方法、ならびにヒステリシスカップリング装置
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WO2007032531A1 (fr) * 2005-09-16 2007-03-22 Hitachi Metals, Ltd. Alliage magnétique nanocristallin, son procédé de production, bande mince d’alliage, et composant magnétique
JP2007270271A (ja) * 2006-03-31 2007-10-18 Hitachi Metals Ltd 軟磁性合金、その製造方法ならびに磁性部品
JP2007333392A (ja) * 2006-06-12 2007-12-27 Yokogawa Electric Corp 電磁流量計
WO2008129803A1 (fr) * 2007-03-20 2008-10-30 Nec Tokin Corporation Alliage magnétique doux, élément magnétique doté de cet alliage et leurs procédés de production

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111636039A (zh) * 2020-05-11 2020-09-08 北京科技大学 一种高饱和磁化强度Fe-B-P-C-Cu-M系非晶纳米晶软磁合金及制备方法

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