JPH0140934B2 - - Google Patents
Info
- Publication number
- JPH0140934B2 JPH0140934B2 JP56189539A JP18953981A JPH0140934B2 JP H0140934 B2 JPH0140934 B2 JP H0140934B2 JP 56189539 A JP56189539 A JP 56189539A JP 18953981 A JP18953981 A JP 18953981A JP H0140934 B2 JPH0140934 B2 JP H0140934B2
- Authority
- JP
- Japan
- Prior art keywords
- electromagnetic flowmeter
- calibrated
- temporary
- magnetic field
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 11
- 229910052708 sodium Inorganic materials 0.000 description 11
- 239000011734 sodium Substances 0.000 description 11
- 229910001338 liquidmetal Inorganic materials 0.000 description 10
- 238000005259 measurement Methods 0.000 description 5
- 150000002739 metals Chemical class 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】
発明の技術分野
本発明は液体金属ナトリウム等の高温の溶融金
属用電磁流量計の校正方法に関する。DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a method for calibrating an electromagnetic flow meter for high temperature molten metals such as liquid metallic sodium.
発明の技術的背景とその問題点
従来、高温の液体金属ナトリウム等の流量測定
には第１図に示すような溶融金属用電磁流量計が
用いられている。この電磁流量計は、液体金属ナ
トリウムを流通させるステンレス製の配管１の外
部に液体金属ナリウムの流通方向に直交する磁界
を発生させる磁界発生部２を設け、かつこの磁界
に直交する方向の配管１外面に一対の電極３，３
を設け、電極３，３間に発生する電圧を測定して
流量を求めるものである。この電極３，３は液体
金属ナトリウムの導電性がステンレス製の配管１
よりも良いので配管１の外面に直接溶接するだけ
でよい。Technical background of the invention and its problems Conventionally, an electromagnetic flowmeter for molten metal as shown in FIG. 1 has been used to measure the flow rate of high-temperature liquid metal sodium. This electromagnetic flowmeter includes a magnetic field generating section 2 that generates a magnetic field perpendicular to the flow direction of the liquid metal sodium on the outside of a stainless steel piping 1 through which liquid metal sodium flows, and a piping 1 in a direction perpendicular to the magnetic field. A pair of electrodes 3, 3 on the outer surface
is provided, and the voltage generated between the electrodes 3 and 3 is measured to determine the flow rate. These electrodes 3, 3 are made of stainless steel piping 1, which is conductive to liquid metal sodium.
Since it is better than the above, it is sufficient to simply weld it directly to the outer surface of the pipe 1.
ところで、従来かかる電磁流量計を校正する場
合には次に述べる実流校正法が行なわれていた。
この実流校正法はまず一定流量の液体金属ナトリ
ウムを流通させる配管を備えた実流校正設備を準
備し、この配管に校正される電磁流量計を設置し
て実際に一定流量の液体金属ナトリウムを流して
電磁流量計を校正する方法である。 By the way, when calibrating such an electromagnetic flowmeter, the following actual flow calibration method has been used.
This actual flow calibration method first prepares an actual flow calibration facility equipped with piping that flows through a constant flow of liquid metal sodium, and then installs an electromagnetic flowmeter to be calibrated in this piping to actually flow a constant flow of liquid metal sodium. This is a method of calibrating an electromagnetic flowmeter by flowing the flow.
ところが、この実流校正法では大掛りな実流校
正設備を必要とし、校正される電磁流量計をこの
実流校正設備に設置しなければならなかつた。し
たがつて実流校正設備を準備するために多大の費
用を要し、校正される電磁流量計を実流校正設備
に設置するために校正作業に長時間を要する不具
合があつた。 However, this actual flow calibration method requires large-scale actual flow calibration equipment, and the electromagnetic flowmeter to be calibrated must be installed in this actual flow calibration equipment. Therefore, a large amount of cost is required to prepare the actual flow calibration equipment, and the calibration work requires a long time to install the electromagnetic flowmeter to be calibrated in the actual flow calibration equipment.
そこで、校正される電磁流量計を測定部位に設
置した状態で、測定部位に発生する磁界の磁束密
度を測定し、この磁界により発生する起電力を算
出して電磁流量計を校正する理論校正法が開発さ
れた。 Therefore, a theoretical calibration method that calibrates the electromagnetic flowmeter by measuring the magnetic flux density of the magnetic field generated in the measurement area with the electromagnetic flowmeter to be calibrated installed at the measurement area, and calculating the electromotive force generated by this magnetic field. was developed.
ところが、この理論校正法では算出される起電
力と実際に発生する起電力との間に誤差が生じ、
十分な精度で校正をすることができない不具合が
あつた。 However, with this theoretical calibration method, an error occurs between the calculated electromotive force and the actually generated electromotive force,
There was a problem that made it impossible to calibrate with sufficient accuracy.
本発明の目的
本発明は大掛りな実流校正設備を要せず溶融金
属用電磁流量計を測定部位に取付けた状態で正確
にかつ容易に校正する溶融金属用電磁流量計の校
正方法を提供することを目的とする。Purpose of the Invention The present invention provides a method for calibrating an electromagnetic flowmeter for molten metals, which does not require large-scale actual flow calibration equipment and allows accurate and easy calibration of the electromagnetic flowmeter for molten metals while the electromagnetic flowmeter is attached to a measurement site. The purpose is to
本発明の概要
本発明は溶融金属が流通する配管に取付けられ
た電磁流量計の同一配管径路内の配管外面に一対
の電極を対向して取付け、この電極に対して垂直
方向の磁界を発生させる既に校正された磁界発生
部を設けて仮設電磁流量計を形成し、この仮設電
磁流量計から得られる出力信号により上記電磁流
量計を比較校正し、上記目的を達成するものであ
る。Summary of the present invention The present invention is an electromagnetic flowmeter attached to a pipe through which molten metal flows, in which a pair of electrodes are mounted facing each other on the outer surface of the pipe in the same pipe route, and a magnetic field is generated in a direction perpendicular to the electrodes. The above object is achieved by forming a temporary electromagnetic flowmeter by providing an already calibrated magnetic field generating section, and comparing and calibrating the electromagnetic flowmeter using an output signal obtained from the temporary electromagnetic flowmeter.
本発明の実施例
第２図にしたがつて本発明の実施例を説明す
る。図中４はステンレス製の配管であり、この配
管４には校正される液体金属ナトリウム用の電磁
流量計５が設けられている。この電磁流量計５の
近傍の配管４外面には互いに対向して一対の電極
６，６を溶接する。そして、別途あらかじめ校正
された磁界発生部としての永久磁石７を上記電極
６，６に垂直方向の磁界を発生させるよう設け、
仮設電磁流量計８を形成する。そして、配管４に
液体金属ナトリウムを流すと校正される電磁流量
計５および仮設電磁流量計８の電極６，６には起
電力が生じる。このとき、仮設電磁流量計８の永
久磁石７はあらかじめ校正されているので上記電
極６，６に生じる起電力と比較して電磁流量計５
を校正する。そして校正後には永久磁石７を取除
く。Embodiment of the present invention An embodiment of the present invention will be described with reference to FIG. In the figure, 4 is a stainless steel pipe, and this pipe 4 is provided with an electromagnetic flowmeter 5 for liquid metal sodium to be calibrated. A pair of electrodes 6, 6 are welded to the outer surface of the pipe 4 near the electromagnetic flowmeter 5 so as to face each other. Then, a permanent magnet 7 as a magnetic field generating section, which is separately calibrated in advance, is provided to generate a magnetic field in the perpendicular direction to the electrodes 6, 6.
A temporary electromagnetic flowmeter 8 is formed. When liquid metal sodium is poured into the pipe 4, an electromotive force is generated in the electrodes 6, 6 of the electromagnetic flowmeter 5 and the temporary electromagnetic flowmeter 8 to be calibrated. At this time, since the permanent magnet 7 of the temporary electromagnetic flowmeter 8 has been calibrated in advance, the electromotive force generated in the electrodes 6, 6 is compared with the electromotive force generated in the electromagnetic flowmeter 8.
Proofread. After the calibration, the permanent magnet 7 is removed.
而して、以上のような溶融金属用電流流量計の
校正方法によれば、大掛りな実流校正設備を使用
せず電磁流量計５を測定部位に設置したままで実
流校正法と同様に正確な校正を行なうことができ
る。また、校正される電磁流量計５を測定部位か
ら取外す必要がないので容易に短時間で校正作業
を行なうことができる。さらに、配管４には電極
６，６を溶接するだけで、永久磁石７は別途保管
しておけばよいので既存の設備にも容易に実施す
ることができる。 Therefore, according to the method for calibrating a current flowmeter for molten metal as described above, the electromagnetic flowmeter 5 can be installed at the measurement site without using large-scale actual flow calibration equipment, and it can be calibrated in the same way as the actual flow calibration method. Accurate calibration can be performed. Further, since it is not necessary to remove the electromagnetic flowmeter 5 to be calibrated from the measurement site, the calibration work can be easily carried out in a short time. Further, since the electrodes 6, 6 only need to be welded to the pipe 4 and the permanent magnet 7 can be stored separately, it can be easily applied to existing equipment.
本発明の変形例
第３図にしたがつて本発明の変形例を説明す
る。図中９はポンプであり、このポンプ９から吐
出される液体金属ナトリウムは左右の配管径路に
分岐される。そして、分岐点の左右にはそれぞれ
閉止弁１０，１１が設けられている。そして、右
側径路には校正済の電磁流量計１２が設けられ、
左側径路には未校正の電磁流量計１３が設けられ
ている。また、左右の径路にはそれぞれ熱交換器
１４，１５，１６が設けられている。Modification of the present invention A modification of the present invention will be described with reference to FIG. In the figure, 9 is a pump, and the liquid metal sodium discharged from this pump 9 is branched into left and right piping paths. Shutoff valves 10 and 11 are provided on the left and right sides of the branch point, respectively. A calibrated electromagnetic flowmeter 12 is installed in the right path.
An uncalibrated electromagnetic flowmeter 13 is provided in the left path. Furthermore, heat exchangers 14, 15, and 16 are provided in the left and right paths, respectively.
このような配管径路において、校正済の電磁流
量計１２を用いて未校正の電磁流量計１３を校正
することは、左右の配管径路に流れる液体金属ナ
トリウムの流量が異なるので不可能である。そこ
で、左右の配管径路が共通する部分、すなわちポ
ンプ９の近傍に仮設電磁流量計１４を設ける。こ
の仮設電磁流量計１４は未校正のものでもよい。
次に、閉止弁１０を閉止し全流量を右側配管径路
に流通させる。そして電磁流量計１２で仮設電磁
流量計１４を校正する。次に、閉止弁１１を閉止
し閉止弁１０を開成して全流量を左側配管径路に
流通させる。そして、校正された仮設電流量計１
４で電磁流量計１３を校正する。そして、校正後
には仮設電磁流量計１４を取外す。 In such a piping route, it is impossible to calibrate an uncalibrated electromagnetic flowmeter 13 using a calibrated electromagnetic flowmeter 12 because the flow rates of liquid metal sodium flowing in the left and right piping routes are different. Therefore, a temporary electromagnetic flowmeter 14 is provided at a portion where the left and right piping paths are common, that is, near the pump 9. This temporary electromagnetic flowmeter 14 may be an uncalibrated one.
Next, the shutoff valve 10 is closed to allow the entire flow to flow through the right piping path. Then, the temporary electromagnetic flowmeter 14 is calibrated using the electromagnetic flowmeter 12. Next, the shutoff valve 11 is closed and the shutoff valve 10 is opened to allow the entire flow to flow through the left piping path. Then, the calibrated temporary ammeter 1
4, calibrate the electromagnetic flowmeter 13. After the calibration, the temporary electromagnetic flowmeter 14 is removed.
また、仮設電磁流量計１４の磁界発生部は前述
の実施例のように永久磁石７に限らずコイルを用
いて磁界を発生させるものでもよい。 Furthermore, the magnetic field generating section of the temporary electromagnetic flowmeter 14 is not limited to the permanent magnet 7 as in the above-described embodiment, but may also be one that generates a magnetic field using a coil.
本発明の効果
本発明による溶融金属用電磁流量計の校正方法
は、溶融金属が流通する配管に取付けられた電磁
流量計の同一配管径路内の配管外面に一対の電極
を対向して取付け、この電極に対して垂直方向の
磁界を発生させる既に校正された磁界発生部を設
けて仮設電磁流量計を形成し、この仮設電磁流量
計から得られる出力信号により上記電磁流量計を
比較校正するものである。したがつて、大掛りな
実流校正設備を使用せず実流校正法と同様に正確
な校正を容易に行なうことができる等その効果は
大である。Effects of the Present Invention The method of calibrating an electromagnetic flowmeter for molten metal according to the present invention involves attaching a pair of electrodes facing each other to the outer surface of the pipe in the same pipe path of the electromagnetic flowmeter installed in a pipe through which molten metal flows. A temporary electromagnetic flowmeter is formed by providing an already calibrated magnetic field generating section that generates a magnetic field perpendicular to the electrodes, and the above electromagnetic flowmeter is comparatively calibrated using the output signal obtained from this temporary electromagnetic flowmeter. be. Therefore, it has great effects, such as being able to easily perform accurate calibration in the same way as the actual flow calibration method without using large-scale actual flow calibration equipment.
第１図は溶融金属用電磁流量計の構成図、第２
図は本発明の実施例の斜視図、第３図は本発明の
変形例を示す配管系統図である。
４……配管、５……電磁流量計、６……電極、
７……永久磁石（磁界発生部）、８……仮設電磁
流量計。
Figure 1 is a configuration diagram of an electromagnetic flowmeter for molten metal, Figure 2
The figure is a perspective view of an embodiment of the invention, and FIG. 3 is a piping system diagram showing a modification of the invention. 4... Piping, 5... Electromagnetic flowmeter, 6... Electrode,
7... Permanent magnet (magnetic field generating part), 8 ... Temporary electromagnetic flowmeter.
Claims (1)
流量計の同一配管径路内の配管外面に一対の電極
を対向して取付け、この電極に対して垂直方向の
磁界を発生させる既に校正された磁界発生部を設
けて仮設電磁流量計を形成し、この仮設電磁流量
計から得られる出力信号により上記電磁流量計を
比較校正することを特徴とする溶融金属用電磁流
量計の校正方法。1 A pair of electrodes are installed facing each other on the outer surface of the pipe in the same pipe path of an electromagnetic flowmeter installed in a pipe through which molten metal flows, and a magnetic field that has already been calibrated is generated to generate a magnetic field in a direction perpendicular to the electrodes. A method for calibrating an electromagnetic flowmeter for molten metal, characterized in that a temporary electromagnetic flowmeter is formed by providing a temporary electromagnetic flowmeter, and the electromagnetic flowmeter is comparatively calibrated using an output signal obtained from the temporary electromagnetic flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56189539A JPS5890123A (en) | 1981-11-26 | 1981-11-26 | Calibration of electro-magnetic flow meter for molten metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56189539A JPS5890123A (en) | 1981-11-26 | 1981-11-26 | Calibration of electro-magnetic flow meter for molten metal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5890123A JPS5890123A (en) | 1983-05-28 |
| JPH0140934B2 true JPH0140934B2 (en) | 1989-09-01 |
Family
ID=16242996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56189539A Granted JPS5890123A (en) | 1981-11-26 | 1981-11-26 | Calibration of electro-magnetic flow meter for molten metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5890123A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1491903A1 (en) * | 2003-05-12 | 2004-12-29 | Kasmatic Innovation A/S | Fiberoptic Faraday effect sensor |
| CN105509824B (en) * | 2016-01-25 | 2018-10-09 | 中国原子能科学研究院 | A kind of magneto flow of liquid metal gauge |
| CN109186722B (en) * | 2018-11-14 | 2020-07-31 | 合肥工业大学 | Online calibration method and system for permanent magnet type sodium flowmeter with embedded vortex generator |
| CN109959434B (en) * | 2019-04-19 | 2020-07-31 | 合肥工业大学 | Sodium flowmeter online calibration method based on phase frequency characteristics |
| CN112212951B (en) * | 2020-10-12 | 2021-12-28 | 合肥工业大学 | Nonlinear correction method for in-situ calibration of permanent magnet sodium flowmeter based on signal frequency band selection |
-
1981
- 1981-11-26 JP JP56189539A patent/JPS5890123A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5890123A (en) | 1983-05-28 |
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