JPS5833537Y2 - electromagnetic flow meter - Google Patents

electromagnetic flow meter

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Publication number
JPS5833537Y2
JPS5833537Y2 JP1977121456U JP12145677U JPS5833537Y2 JP S5833537 Y2 JPS5833537 Y2 JP S5833537Y2 JP 1977121456 U JP1977121456 U JP 1977121456U JP 12145677 U JP12145677 U JP 12145677U JP S5833537 Y2 JPS5833537 Y2 JP S5833537Y2
Authority
JP
Japan
Prior art keywords
measuring tube
magnetic
electromagnetic flowmeter
fluid
metal plate
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
Application number
JP1977121456U
Other languages
Japanese (ja)
Other versions
JPS5447466U (en
Inventor
一郎 和田
Original Assignee
株式会社東芝
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 株式会社東芝 filed Critical 株式会社東芝
Priority to JP1977121456U priority Critical patent/JPS5833537Y2/en
Publication of JPS5447466U publication Critical patent/JPS5447466U/ja
Application granted granted Critical
Publication of JPS5833537Y2 publication Critical patent/JPS5833537Y2/en
Expired legal-status Critical Current

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Description

【考案の詳細な説明】 本考案は被測定流体の流通する測定管を改良した電磁流
量計に関する。
[Detailed Description of the Invention] The present invention relates to an electromagnetic flowmeter with an improved measuring tube through which a fluid to be measured flows.

電磁流量計は周知の如く被測定流体を流通する測定管の
外側に鉄心及び励磁コイルからなる磁束発生装置を設け
、かつ測定管内壁部に一対の電極を露出して対向配置し
ている。
As is well known, in an electromagnetic flowmeter, a magnetic flux generating device consisting of an iron core and an excitation coil is provided on the outside of a measurement tube through which a fluid to be measured flows, and a pair of electrodes are exposed and placed opposite each other on the inner wall of the measurement tube.

そして、被測定流体の流れに対して直角方向に磁束発生
装置より正弦波または矩形波等の交番磁束を加え、これ
により流体内で該磁界の方向及び流れの方向に直角に発
生する起電力を前記一対の電極により流量信号として検
出している。
Then, an alternating magnetic flux such as a sine wave or a rectangular wave is applied from a magnetic flux generator in a direction perpendicular to the flow of the fluid to be measured, thereby reducing the electromotive force generated within the fluid perpendicular to the direction of the magnetic field and the direction of flow. The pair of electrodes detects the flow rate as a signal.

ところで、従来測定管は非金属材料で形成しているが、
管の耐圧、軸線方向の機械的耐圧の観点から金属パイプ
等を用いることも考えられている。
By the way, conventional measurement tubes are made of non-metallic materials,
It is also considered to use a metal pipe or the like from the viewpoint of the pipe's pressure resistance and mechanical pressure resistance in the axial direction.

金属パイプを使用する場合磁場が交番するため流体内部
に生じる起電力によってうず電流が生じ、これが原因で
流量信号が変動し誤差となっている。
When a metal pipe is used, the magnetic field is alternating, and the electromotive force generated inside the fluid generates eddy currents, which cause the flow rate signal to fluctuate and cause errors.

このため、金属パイプの表面の流体流れ方向にそって多
数のみぞを設げてうず電流の減少を図ったものがあるが
、これとて充分な対策とはならず、また構造上特殊なも
のであるので特注となり、価格的に高価なものとなって
実用的なものではない。
For this reason, some have attempted to reduce eddy current by providing a large number of grooves along the fluid flow direction on the surface of metal pipes, but this is not a sufficient countermeasure, and some are structurally special. Therefore, it has to be custom-made and is expensive, making it impractical.

一方、うず電流を減少するための測定管として、前述の
非金属材料で形成したパイプは、所定径のロールにエポ
キシ樹脂等を含浸したファイバーを巻装し、所定肉厚に
なったところでロールから抜きとって乾燥させたもので
ある。
On the other hand, as a measuring tube for reducing eddy current, the pipe made of the non-metallic material mentioned above is made by wrapping fibers impregnated with epoxy resin etc. around a roll of a predetermined diameter, and then removing the pipe from the roll when the thickness reaches a predetermined thickness. It was extracted and dried.

しかし、このような測定管はその材料の性質上半径方向
に対する強度に弱く、このため流体の圧力によって内径
に変動を生じ、これが原因で外側に配置している励磁コ
イルが変化し流量信号の変動によって零点が動く等の問
題がある。
However, due to the nature of the material used, such measurement tubes have weak strength in the radial direction, which causes fluctuations in the inner diameter due to the pressure of the fluid, which causes changes in the excitation coil placed on the outside, causing fluctuations in the flow rate signal. There are problems such as the zero point moving.

また、測定管の強度が弱いために大きな電磁流量計を製
作することができず、その適用範囲がおのずと制限され
る欠点がある。
Furthermore, since the strength of the measuring tube is weak, it is impossible to manufacture a large electromagnetic flowmeter, which naturally limits the scope of its application.

本考案は以上の点に鑑みなされてなされたもので、うず
電流を大幅に減少させるとともに強度のすぐれた測定管
を安価に実現し、これによって大形のものでも製作可能
にし、かつ高精度の流量測定を行なうことのできる電磁
流量計を提供するものである。
The present invention was devised in view of the above points, and it is possible to significantly reduce eddy currents, realize a measuring tube with excellent strength at low cost, and thereby make it possible to manufacture even large-sized tubes with high precision. An electromagnetic flowmeter capable of measuring flow rate is provided.

以下、図面を参照して本考案の実施例を説明する。Embodiments of the present invention will be described below with reference to the drawings.

第1図は電磁流量計における測定管の一例を示す図であ
って、これは被測定流体を流通するために必要な所定内
径となるように非磁性薄板12を成層に巻装しこれによ
り所定肉厚の測定管13を作る。
FIG. 1 is a diagram showing an example of a measuring tube in an electromagnetic flowmeter, in which a non-magnetic thin plate 12 is wrapped in layers so as to have a predetermined inner diameter necessary for flowing the fluid to be measured. A thick measuring tube 13 is made.

この非磁性薄板12は例えばS U S 316(オー
ステナイト系)ステンレス鋼板、インコネルにッケル系
非磁性鋼又はチタン等)を用い、その厚みは0.35t
〜0.200tのものを用いる。
This non-magnetic thin plate 12 is made of, for example, SUS 316 (austenitic stainless steel plate, Inconel, Kkel non-magnetic steel, titanium, etc.), and its thickness is 0.35 t.
~0.200t is used.

その管の内側にゴム、樹脂、ガラス等の電気絶縁材料に
よるライニング11を施す。
A lining 11 made of an electrically insulating material such as rubber, resin, or glass is applied to the inside of the tube.

なお、図示していないが測定管13の外側には鉄心及び
励磁コイルよりなる磁束発生装置を、また内側に一対の
電極を対向配置することは従来周知の手段で行なう。
Although not shown, a magnetic flux generating device consisting of an iron core and an excitation coil is disposed on the outside of the measurement tube 13, and a pair of electrodes are disposed facing each other on the inside, using conventionally known means.

また、測定管13の他の例として、例えば第2図のよう
に非磁性金属薄基板12aの表面に電気絶縁材12bを
塗布して焼成し酸化皮膜を設けるとか、あるいは直接電
気絶縁材12bを添わせる等した非磁性金属薄板12を
巻装し測定管13を実現してもよい。
Further, as other examples of the measuring tube 13, for example, as shown in FIG. 2, an electrical insulating material 12b is applied to the surface of a non-magnetic metal thin substrate 12a and fired to form an oxide film, or an electrical insulating material 12b is directly applied. The measuring tube 13 may be realized by wrapping a thin non-magnetic metal plate 12 such as a non-magnetic thin plate 12.

この絶縁材12bとしては例えば樹脂系ワニス、ポリエ
ステルフィルム、金属酸化物あるいは紙等を用いる。
As this insulating material 12b, for example, resin varnish, polyester film, metal oxide, paper, or the like is used.

このような構造の測定管13は第1図のものよりうず電
流を著しく減少することができる。
A measuring tube 13 having such a structure can significantly reduce eddy currents compared to the one shown in FIG.

次に第3図は本考案の他の実施例である。Next, FIG. 3 shows another embodiment of the present invention.

この測定管13は絶縁処理した所定幅の非磁性金属板1
2′を、流体の流れの方向に所定の内径でラセン状に巻
装して作ったものである。
This measuring tube 13 is an insulated non-magnetic metal plate 1 of a predetermined width.
2' is wound in a spiral shape with a predetermined inner diameter in the direction of fluid flow.

この場合、金属材料として5US16ステンレス鋼、T
iあるいはZr等を使用し、また絶縁処理材料には例え
ば樹脂塗料、ガラス質ホーロー、樹脂フィルムを用いる
In this case, the metal material is 5US16 stainless steel, T
I, Zr, etc. are used, and as the insulation treatment material, for example, resin paint, vitreous enamel, or resin film is used.

また、非磁性金属板12′をラセン状に巻装した測定管
130強度を上げる方法としては、巻装した非磁性金属
板12′の各層間を接着するとか、第4図のように測定
管13表面を部分的に溶接部14を設けるとか、あるい
は第5図のように所定距離ごとに孔部15を設け、この
非磁性金属板12′を巻装した後に、図示していないが
孔部15にボルトを通してボルト止めをしてもよいもの
である。
In addition, as a method of increasing the strength of the measuring tube 130 in which the non-magnetic metal plate 12' is wound in a helical shape, it is possible to bond each layer of the wound non-magnetic metal plate 12', or as shown in FIG. 13 surface is partially provided with welded portions 14, or holes 15 are provided at predetermined distances as shown in FIG. 15 may be passed through and bolted.

なお、この測定管13の内側にライニング11を施こす
ことは言うまでもない。
It goes without saying that the lining 11 is applied to the inside of the measuring tube 13.

また、第3図に示す測定管13の変形例として、例えば
薄肉のパイプ16を予め設定し、このパイプの上側に非
磁性金属板12′をラセン状に巻装して測定管13を形
成することも可能である。
Further, as a modification of the measuring tube 13 shown in FIG. 3, for example, a thin-walled pipe 16 is set in advance, and a non-magnetic metal plate 12' is wound in a spiral shape on the upper side of this pipe to form the measuring tube 13. It is also possible.

あるいは第1図のようにL字状の非磁性金属板12′を
ラセン状に巻装して測定管13を作ってもよいものであ
る。
Alternatively, the measuring tube 13 may be made by winding an L-shaped non-magnetic metal plate 12' in a helical shape as shown in FIG.

また、測定管13として、例えば第8図のように非磁性
の金属リング12〃を接着したもの、あるいは第9図の
ように異形の非磁性金属板12“をフープ巻にして実現
することもできる。
The measuring tube 13 can also be realized by, for example, gluing a non-magnetic metal ring 12 as shown in FIG. 8, or by hoop-wound a non-magnetic metal plate 12'' of an irregular shape as shown in FIG. can.

以上詳記したように本考案によれば、非磁性金属板を底
層巻き又はラセン状に巻装して測定管を構成したので、
市販の非磁性金属板で簡単に製作でき価格的に安価に実
現できる。
As detailed above, according to the present invention, since the measuring tube is constructed by winding the non-magnetic metal plate in a bottom layer or in a helical shape,
It can be easily manufactured using commercially available non-magnetic metal plates and can be realized at low cost.

また、エポキシ樹脂を含浸したファイバーの測定管と比
較し強度的に非常にすぐれているので、流体圧力によっ
て変形したり、永年の使用によって変形するようなこと
がなく、従って、磁束発生装置の変位による零点変動等
の不都合な問題がなくなり、被測定流体の流量信号を高
精度に測定できる。
In addition, since it has much superior strength compared to a measuring tube made of fiber impregnated with epoxy resin, it will not deform due to fluid pressure or deform due to long-term use, and therefore the displacement of the magnetic flux generator This eliminates inconvenient problems such as zero point fluctuations caused by this, and allows highly accurate measurement of the flow rate signal of the fluid to be measured.

また、ユーザの要望に応じて種々の大きさの測定管を簡
単に作ることができる。
Furthermore, measurement tubes of various sizes can be easily made according to the user's wishes.

さらに、正弦波等の交流励磁方式の場合には、測定管が
非磁性材料の積層形態を採っていることにより、うず電
流を大幅に減少させることが可能となり、零点の安定性
にも寄与する。
Furthermore, in the case of an AC excitation method such as a sine wave, the measurement tube is made of laminated non-magnetic materials, which makes it possible to significantly reduce eddy currents and contributes to the stability of the zero point. .

また矩形波、台形波等のように2回微分して零になるよ
うな波形励磁では励磁電流の切換時のトランジェットに
よるうず電流に基因して矩形波等が正弦波形になりやす
(、これを除去するため矩形波等の時間幅を長くするこ
とで解決しているが、これでは応答速度が低下してしま
う。
Furthermore, in the case of excitation waveforms such as square waves and trapezoidal waves that become zero after being differentiated twice, the rectangular waves tend to become sinusoidal waves due to eddy currents caused by transients when switching the excitation current. In order to eliminate this, the problem is solved by increasing the time width of a rectangular wave, etc., but this reduces the response speed.

本測定管のような構造ではうず電流を著しく小さくでき
るので、一対の電極から取り出される流量信号の波形は
矩形波等と同程度の立上りを持った信号を取り出すこと
が可能となり、応答速度の改善を図ることができる。
With a structure like this measurement tube, eddy current can be significantly reduced, so the waveform of the flow rate signal extracted from the pair of electrodes can have a rise comparable to that of a rectangular wave, etc., improving response speed. can be achieved.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本考案に係る電磁流量計の測定管の斜視図、第
2図は第1図に示す非磁性金属薄板の他の例を説明する
一部切欠して拡大した図、第3図は測定管の他の実施例
を説明する斜視図、第4図及び第5図は第3図に示す測
定管の強度を保持するための2態様例図、第6図及び第
1図は第3図に示すラセン巻きの測定管の変形例を説明
する一部切欠きして示す図、第8図及び第9図は測定管
の他の例を示す図である。 11・・・ライニング、12・・・非磁性金属薄板、1
2′・・・非磁性金属板、12“・・・非磁性金属リン
グ、 12a・・・非磁性金属基板、 12b・・・電気絶縁 材。
Fig. 1 is a perspective view of a measurement tube of an electromagnetic flowmeter according to the present invention, Fig. 2 is a partially cutaway enlarged view illustrating another example of the non-magnetic metal thin plate shown in Fig. 1, and Fig. 3 is a perspective view for explaining another embodiment of the measuring tube, FIGS. 4 and 5 are illustrations of two embodiments for maintaining the strength of the measuring tube shown in FIG. 3, and FIG. 6 and FIG. FIG. 3 is a partially cutaway view illustrating a modified example of the spiral-wound measuring tube shown in FIG. 3, and FIGS. 8 and 9 are views showing other examples of the measuring tube. 11... Lining, 12... Non-magnetic metal thin plate, 1
2'...Nonmagnetic metal plate, 12''...Nonmagnetic metal ring, 12a...Nonmagnetic metal substrate, 12b...Electrical insulating material.

Claims (1)

【実用新案登録請求の範囲】 (リ 被測定流体を流す測定管の外側に磁束発生装置を
設け、該装置の交番磁束を測定管内部の流体に作用させ
て管内壁部に対向配置した一対の電極から流量信号を取
り出す電磁流量計において、薄肉の非磁性金属板を半径
方向に成層巻き又は所定幅の非磁性金属板を半径方向と
直交する方向にラセン状に巻装して液密に形成した測定
管を用いたことを特徴とする電磁流量計。 (2)非磁性金属板として、非磁性金属素板の表面に電
気絶縁材を添着したことを特徴とする実用新案登録請求
の範囲第1項記載の電磁流量計。
[Scope of Claim for Utility Model Registration] (Li. A magnetic flux generating device is provided outside the measuring tube through which the fluid to be measured flows, and the alternating magnetic flux of the device is applied to the fluid inside the measuring tube. In an electromagnetic flowmeter that extracts a flow rate signal from an electrode, a thin non-magnetic metal plate is wound in layers in the radial direction, or a non-magnetic metal plate of a predetermined width is wound in a spiral shape in a direction perpendicular to the radial direction to form a liquid-tight structure. An electromagnetic flowmeter characterized in that it uses a measurement tube that is made of a metal. The electromagnetic flowmeter described in item 1.
JP1977121456U 1977-09-09 1977-09-09 electromagnetic flow meter Expired JPS5833537Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1977121456U JPS5833537Y2 (en) 1977-09-09 1977-09-09 electromagnetic flow meter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1977121456U JPS5833537Y2 (en) 1977-09-09 1977-09-09 electromagnetic flow meter

Publications (2)

Publication Number Publication Date
JPS5447466U JPS5447466U (en) 1979-04-02
JPS5833537Y2 true JPS5833537Y2 (en) 1983-07-27

Family

ID=29078617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1977121456U Expired JPS5833537Y2 (en) 1977-09-09 1977-09-09 electromagnetic flow meter

Country Status (1)

Country Link
JP (1) JPS5833537Y2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5042778U (en) * 1973-08-13 1975-04-30

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5042778U (en) * 1973-08-13 1975-04-30

Also Published As

Publication number Publication date
JPS5447466U (en) 1979-04-02

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