WO2009119132A1 - Electromagnetic flowmeter - Google Patents
Electromagnetic flowmeter Download PDFInfo
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- WO2009119132A1 WO2009119132A1 PCT/JP2009/050372 JP2009050372W WO2009119132A1 WO 2009119132 A1 WO2009119132 A1 WO 2009119132A1 JP 2009050372 W JP2009050372 W JP 2009050372W WO 2009119132 A1 WO2009119132 A1 WO 2009119132A1
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- measurement tube
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- peripheral surface
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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
- 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
Abstract
Recessed parts (6, 6) having flat bottom surfaces depressed outward further than the inner diameter (φ) of a measurement pipe (1) are so formed as to face the inner peripheral surface (5) of the measurement pipe (1). The edge surfaces around the recessed parts (6, 6), which form boundary parts between the inner peripheral surface (5) of the measuring pipe (1) and the recessed parts, are so arranged to be smoothly connected with the inner diameter (φ) of the measurement pipe (1) by tapers or round curved surfaces. Through-holes (6b, 6b) are formed in the bottom surfaces (6a, 6a) of the recessed parts (6, 6). Signal electrodes(7, 7) are mounted to the recessed parts (6, 6) of the measurement pipe (1) with gaskets (8, 8) interposed between the rear surfaces of plate-like electrode parts (7a, 7a) and the bottom surfaces (6a, 6a) of the recessed parts (6, 6). When a lining (3) is made of Teflon, the gaskets (8) can be eliminated.
Description
この発明は、測定管の内周面に信号電極を備えた電磁流量計に関するものである。
The present invention relates to an electromagnetic flow meter provided with a signal electrode on the inner peripheral surface of a measuring tube.
従来より、この種の電磁流量計は、測定管内を流れる流体の流れ方向に対して直交する方向に磁界を作る励磁コイルと、この励磁コイルが作る磁界と直交する方向に対向して測定管の内周面に設けられた信号電極とを有し、励磁コイルが作る磁界により測定管内を流れる流体に発生する起電力を信号電極より取り出すようにしている（例えば、文献１（特開平４－３１９６２２号公報）参照）。
Conventionally, this type of electromagnetic flowmeter has an excitation coil that creates a magnetic field in a direction perpendicular to the flow direction of the fluid flowing in the measurement tube, and a measurement tube that faces the direction perpendicular to the magnetic field created by the excitation coil. And an electromotive force generated in the fluid flowing in the measurement tube by the magnetic field generated by the exciting coil is taken out from the signal electrode (for example, reference 1 (Japanese Patent Laid-Open No. 4-319622). No.)).
図４に従来の電磁流量計の要部を示す。同図において、１０は測定管であり、非磁性金属製パイプ（例えば、非磁性ステンレス製のパイプ）２０と、この非磁性金属製パイプ２０の内側に形成されたライニング３０とから構成される。
Fig. 4 shows the main parts of a conventional electromagnetic flow meter. In the figure, reference numeral 10 denotes a measuring tube, which is composed of a nonmagnetic metal pipe (for example, a nonmagnetic stainless steel pipe) 20 and a lining 30 formed inside the nonmagnetic metal pipe 20.
この例では、フッ素樹脂（テフロン（登録商標））の膜が非磁性金属製パイプ２０の内側に形成されライニング３０とされている。４０，４０は測定管１の内周面５に対向して設けられた信号電極である。
In this example, a film of fluororesin (Teflon (registered trademark)) is formed inside the non-magnetic metal pipe 20 to form a lining 30. Reference numerals 40 and 40 denote signal electrodes provided to face the inner peripheral surface 5 of the measuring tube 1.
なお、図４に概略的に一点鎖線で示すように、測定管１０内を流れる流体の流れ方向に対して直交する方向に磁界を作る励磁コイルＣＬが設けられており、この励磁コイルＣＬが作る磁界と直交する方向に、対向して信号電極４０，４０が設けられている。
In addition, as schematically shown by a one-dot chain line in FIG. 4, an exciting coil CL that creates a magnetic field in a direction orthogonal to the flow direction of the fluid flowing in the measuring tube 10 is provided. Signal electrodes 40 and 40 are provided opposite to each other in a direction orthogonal to the magnetic field.
このような電磁流量計において、信号電極の設計にあたっては、電磁流量計の測定精度向上の点から、信号電極と測定流体との間に形成される電位に起因して発生するフローノイズの影響を受け難くすることが肝要である。この場合、測定流体と接液する信号電極の面積を大きくとれば、フローノイズの影響を受け難くすることができる。
In such an electromagnetic flow meter, when designing the signal electrode, from the viewpoint of improving the measurement accuracy of the electromagnetic flow meter, the influence of the flow noise generated due to the potential formed between the signal electrode and the measurement fluid is affected. It is important to make it difficult to receive. In this case, if the area of the signal electrode in contact with the measurement fluid is increased, the influence of flow noise can be reduced.
ところで、電磁流量計はプラント等で使用される様々な口径の配管に取り付けられるので、電磁流量計を供給するメーカは電磁流量計の測定管を小さい口径から大きい口径まで複数種類を製造しておく必要がある。この場合、測定管以外の部品（例えば、信号電極）について、測定管の口径の大小に拘わらず共通の部品を使用できるようにしておけば、部品の種類を少なくし、製造コストを低減することができる。
By the way, electromagnetic flowmeters are attached to pipes of various diameters used in plants and the like, so manufacturers that supply electromagnetic flowmeters produce multiple types of measurement pipes for electromagnetic flowmeters from small to large diameters. There is a need. In this case, if the parts other than the measuring tube (for example, signal electrodes) can be used regardless of the diameter of the measuring tube, the number of types of parts can be reduced and the manufacturing cost can be reduced. Can do.
すなわち、電磁流量計の信号電極を設計するうえでは、フローノイズの影響を受け難くするために、信号電極の面積を大きくとることと、測定管の大小に拘わらず共通の部品を使用できることが求められる。
That is, when designing the signal electrode of an electromagnetic flow meter, in order to make it less susceptible to the effects of flow noise, it is required that the area of the signal electrode be large and that common parts can be used regardless of the size of the measurement tube. It is done.
このような要求に応える電磁流量計として、文献２（特開平８－１６７３３９号公報）では、その概略を図５Ａに示すように、測定管の内周面５に所定幅Ｗの平面部Ｐを対向して形成し、この平面部Ｐに信号電極を取り付けるようにしている。これにより、文献２では、測定管の口径によらず信号電極を１種類とすることができ、しかも信号電極を必要に応じて大きくすることができる、という効果が得られるとしている。
As an electromagnetic flow meter that meets such demands, Document 2 (Japanese Patent Application Laid-Open No. 8-167339) discloses an outline of a flat portion P having a predetermined width W on the inner peripheral surface 5 of a measuring tube as shown in FIG. 5A. Oppositely formed, the signal electrode is attached to the plane portion P. Thereby, in Document 2, it is said that one type of signal electrode can be used regardless of the diameter of the measuring tube, and the effect that the signal electrode can be increased as necessary is obtained.
また、文献３（特開平５－１５５０６２号公報）では、その概略を図６Ａに示すように、測定管の内周面５０の一部領域に所定幅Ｗの平面Ｈを有する突部を対向して設け、この突部の平面（突出上面）Ｈに信号電極を取り付けるようにしている。これは、文献１と同様に、信号電極の取付面を平面とすることによって、文献２と同様の効果を得ようとするものである。
Further, in Document 3 (Japanese Patent Laid-Open No. 5-155062), as schematically shown in FIG. 6A, a protrusion having a plane H having a predetermined width W is opposed to a partial region of the inner peripheral surface 50 of the measurement tube. The signal electrode is attached to the flat surface (projecting upper surface) H of the protrusion. This is to obtain the same effect as in Document 2 by making the mounting surface of the signal electrode flat as in Document 1.
しかしながら、文献２に示された信号電極の取付方法によると、例えばその測定管の内径に等しい寸法まで信号電極を大きくしようとした場合、図５Ｂに示すように、測定管の流路が配管断面積に比較して極端に狭くなり、測定精度に影響を及ぼす。このため、フローノイズの低減に必要であっても、測定管の内径寸法の制約から、信号電極の面積が制限されてしまう。このため、大きい口径では組み付け寸法上問題ない信号電極が、小さい口径では組み付け寸法上問題となり、信号電極を測定管の全口径で１種類に統一することができない。
However, according to the signal electrode mounting method shown in Document 2, for example, if the signal electrode is to be enlarged to a size equal to the inner diameter of the measurement tube, as shown in FIG. Compared to the area, it becomes extremely narrow and affects the measurement accuracy. For this reason, even if it is necessary for reducing the flow noise, the area of the signal electrode is limited due to the restriction of the inner diameter of the measurement tube. For this reason, a signal electrode having no problem in assembling dimensions with a large diameter becomes a problem in assembling dimensions with a small diameter, and the signal electrodes cannot be unified into one type for all the diameters of the measuring tubes.
また、文献３に示された信号電極の取付方法においても、図５Ｂに対応する図を図６Ｂに示すように、測定管の流路が配管断面積に比較して極端に狭くなり、文献２に示された信号電極の取付方法と同様の問題が生じる。
Also, in the signal electrode mounting method shown in Document 3, as shown in FIG. 6B, the flow channel of the measurement tube becomes extremely narrow compared to the pipe cross-sectional area, as shown in FIG. 6B. The same problem as the signal electrode mounting method shown in FIG.
本発明は、このような課題を解決するためになされたもので、その目的とするところは、口径が小さい測定管においても、測定管の流路を極端に狭くすることなく、信号電極の面積を大きくとり、測定管の全口径で信号電極を１種類に統一することができる電磁流量計を提供することにある。
The present invention has been made in order to solve such a problem, and the object of the present invention is to reduce the area of the signal electrode without extremely narrowing the flow path of the measurement tube even in a measurement tube having a small diameter. The purpose of this invention is to provide an electromagnetic flow meter that can unify signal electrodes into one type with the entire diameter of the measuring tube.
このような目的を達成するために、本発明は、測定管内を流れる流体の流れ方向に対して直交する方向に磁界を作る励磁コイルと、この励磁コイルが作る磁界と直交する方向に対向して測定管の内周面に設けられた信号電極とを備えた電磁流量計において、信号電極を電極部とこの電極部の裏面側に設けられた軸部とを有するものとし、測定管の内周面に対向して測定管の内径よりも外側に凹んだ平面状の底面を有する窪み部を設け、またこの窪み部の底面に測定管の外周面に向けて貫通する貫通孔を有するものとし、この貫通孔にその電極部の裏面側に設けられた軸部を通して、信号電極を窪み部に取り付けるようにしたものである。
In order to achieve such an object, the present invention is directed to an exciting coil that creates a magnetic field in a direction perpendicular to the flow direction of the fluid flowing in the measuring tube, and a direction that is perpendicular to the magnetic field created by the exciting coil. In an electromagnetic flowmeter provided with a signal electrode provided on the inner peripheral surface of the measurement tube, the signal electrode has an electrode portion and a shaft portion provided on the back side of the electrode portion, and the inner circumference of the measurement tube Provided with a hollow portion having a flat bottom face that is recessed outward from the inner diameter of the measurement tube facing the surface, and has a through-hole penetrating toward the outer peripheral surface of the measurement tube on the bottom surface of this depression portion, The signal electrode is attached to the recess through the shaft provided on the back side of the electrode portion through the through hole.
この発明によれば、測定管の内周面に対向して設けられた測定管の内径よりも外側に凹んだ平面状の底面を有する窪み部に信号電極を取り付けることにより、小さい口径の測定管に対しても、その測定管の流路を配管断面積に比較して極端に狭くすることなく、大きな面積の信号電極を取り付けることが可能となる。これにより、小さい口径から大きい口径まで、フローノイズに強い大面積の信号電極を共通で使用することができるようになる。
According to the present invention, a measurement tube having a small diameter is provided by attaching a signal electrode to a recess having a flat bottom surface recessed outward from the inner diameter of the measurement tube provided to face the inner peripheral surface of the measurement tube. However, it is possible to attach a signal electrode having a large area without making the flow path of the measurement tube extremely narrow compared to the cross-sectional area of the piping. As a result, a large-area signal electrode that is resistant to flow noise can be used in common from a small aperture to a large aperture.
また、本発明では、測定管の対向する窪み部の底面が平面状となっているので、窪み部の深さを極力浅く、すなわち測定管電極部位の測定管の外側への張り出しを極力小さくすることができる。窪み部の底面を平面状ではなく、テーパ状にしようとする場合、電磁流量計の測定管の外側に対し、測定管のテーパ状の電極部位が大きく張り出すため、測定管の外側に配置される電極締結のための部品や、コイルなどその他部品の寸法に制約が生じる。これに対し、窪み部の底面を平面状とすれば、電極部を平面状として、窪み部の深さを極力浅くできるため、電極締結のための部品や、コイルなどその他部品の寸法への影響を最小限とできる。
Further, in the present invention, since the bottom surface of the recess portion facing the measurement tube is flat, the depth of the recess portion is as shallow as possible, that is, the protrusion of the measurement tube electrode part to the outside of the measurement tube is minimized. be able to. When the bottom surface of the dent is to be tapered rather than flat, the tapered electrode part of the measuring tube protrudes greatly from the outside of the measuring tube of the electromagnetic flowmeter, so it is placed outside the measuring tube. There are restrictions on the dimensions of the parts for fastening the electrodes and other parts such as coils. On the other hand, if the bottom surface of the recess is made flat, the electrode can be made flat and the depth of the recess can be made as shallow as possible, which affects the dimensions of parts for fastening the electrodes and other parts such as coils. Can be minimized.
本発明によれば、測定管の内周面に対向して測定管の内径よりも外側に凹んだ平面状の底面を有する窪み部を設け、またこの窪み部の底面に測定管の外周面に向けて貫通する貫通孔を有するものとし、この貫通孔にその電極部の裏面側に設けられた軸部を通して信号電極を窪み部に取り付けるようにしたので、小さい口径の測定管に対しても、その測定管の流路を配管断面積に比較して極端に狭くすることなく、大きな面積の信号電極を取り付けることが可能となり、測定管の全口径で信号電極を１種類に統一することができるようになる。
According to the present invention, a recess having a flat bottom surface that is recessed outward from the inner diameter of the measurement tube is provided opposite to the inner peripheral surface of the measurement tube, and the outer surface of the measurement tube is provided on the bottom surface of the recess. Since the signal electrode is attached to the recess through the shaft provided on the back side of the electrode part in this through hole, even for a small-diameter measuring tube, It is possible to attach a large-area signal electrode without making the flow path of the measurement tube extremely narrow compared to the cross-sectional area of the pipe, and the signal electrode can be unified into one type for the entire diameter of the measurement tube. It becomes like this.
以下、本発明を図面に基づいて詳細に説明する。
図１はこの発明に係る電磁流量計の一実施例の要部を示す図であり、図１Ａは測定管の軸方向に沿った正面断面図、図１Ｂは測定管の軸方向からみた側面図である。また、図２は図１ＡにおけるＡ－Ａ線断面図、図３は図１ＡにけるＢ－Ｂ線断面図である。これらの図において、１は測定管、２は金属製パイプ、３はライニング、５は測定管１の内周面であり、図４に示した従来の電磁流量計における測定管１０、金属製パイプ２０、ライニング３０、測定管１０の内周面５０に対応する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing a main part of one embodiment of an electromagnetic flow meter according to the present invention, FIG. 1A is a front sectional view along the axial direction of the measuring tube, and FIG. 1B is a side view seen from the axial direction of the measuring tube. It is. 2 is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 1A. In these drawings, 1 is a measurement tube, 2 is a metal pipe, 3 is a lining, 5 is an inner peripheral surface of themeasurement tube 1, and the measurement tube 10 and the metal pipe in the conventional electromagnetic flow meter shown in FIG. 20, the lining 30, and the inner peripheral surface 50 of the measuring tube 10.
図１はこの発明に係る電磁流量計の一実施例の要部を示す図であり、図１Ａは測定管の軸方向に沿った正面断面図、図１Ｂは測定管の軸方向からみた側面図である。また、図２は図１ＡにおけるＡ－Ａ線断面図、図３は図１ＡにけるＢ－Ｂ線断面図である。これらの図において、１は測定管、２は金属製パイプ、３はライニング、５は測定管１の内周面であり、図４に示した従来の電磁流量計における測定管１０、金属製パイプ２０、ライニング３０、測定管１０の内周面５０に対応する。 Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing a main part of one embodiment of an electromagnetic flow meter according to the present invention, FIG. 1A is a front sectional view along the axial direction of the measuring tube, and FIG. 1B is a side view seen from the axial direction of the measuring tube. It is. 2 is a cross-sectional view taken along line AA in FIG. 1A, and FIG. 3 is a cross-sectional view taken along line BB in FIG. 1A. In these drawings, 1 is a measurement tube, 2 is a metal pipe, 3 is a lining, 5 is an inner peripheral surface of the
この実施例では、測定管１の内周面５に対向して窪み部６，６を設け、この窪み部６，６に信号電極７，７を取り付けている。窪み部６，６は、その底面６ａ，６ａが平面状とされており、測定管１の内径φよりも外側に凹んでいる。また、窪み部６，６の底面６ａ，６ａには、測定管１の外周面へ向けて貫通孔６ｂ，６ｂが設けられている。また、窪み部６，６の周囲の縁面６ｃ，６ｃは、テーパやＲ曲面などで滑らかに測定管１の内径φにつながっている。
In this embodiment, recesses 6 and 6 are provided facing the inner peripheral surface 5 of the measurement tube 1, and signal electrodes 7 and 7 are attached to the recesses 6 and 6. The bottoms 6 a and 6 a of the recesses 6 and 6 are flat, and are recessed outward from the inner diameter φ of the measuring tube 1. Further, through holes 6 b and 6 b are provided on the bottom surfaces 6 a and 6 a of the recessed portions 6 and 6 toward the outer peripheral surface of the measuring tube 1. Further, the peripheral surfaces 6c and 6c around the depressions 6 and 6 are smoothly connected to the inner diameter φ of the measuring tube 1 by a taper or an R curved surface.
信号電極７，７は、電極部７ａ，７ａと、この電極部７ａ，７ａの裏面側に突出して設けられた軸部７ｂ，７ｂとから構成されている。この信号電極７，７は、その電極部７ａ，７ａの裏面と窪み部６，６の底面６ａ，６ａ（ライニング３の表面）との間にシール性部材としてガスケット８を介在させて、軸部７ｂ，７ｂを貫通孔６ｂ，６ｂを通して測定管１の外周面に突出させ、この測定管１の外周面に突出する軸部７ｂ，７ｂに台座９，９を介してナット１０，１０を締め付けることによって、測定管１の窪み部６，６に取り付けられている。
The signal electrodes 7 and 7 are composed of electrode portions 7a and 7a and shaft portions 7b and 7b provided so as to protrude from the back side of the electrode portions 7a and 7a. The signal electrodes 7 and 7 have shaft portions with gaskets 8 interposed as sealing members between the back surfaces of the electrode portions 7a and 7a and the bottom surfaces 6a and 6a (surfaces of the lining 3) of the recessed portions 6 and 6, respectively. 7b and 7b are protruded to the outer peripheral surface of the measuring tube 1 through the through holes 6b and 6b, and the nuts 10 and 10 are fastened to the shaft portions 7b and 7b protruding from the outer peripheral surface of the measuring tube 1 through the bases 9 and 9. Are attached to the recesses 6 and 6 of the measuring tube 1.
この実施例において、ガスケット８はゴムなどの弾性体とされている。また、信号電極７，７の電極部７ａ，７ａは、窪み部６，６に取り付けられた状態において、その一部が測定管１の内周面５よりも僅かに測定管１の流路内に突出している。なお、電極部７ａ，７ａは、ガスケット８，８も含めて、全て窪み部６，６内に収まるようにしてもよい。
In this embodiment, the gasket 8 is an elastic body such as rubber. In addition, the electrode portions 7 a and 7 a of the signal electrodes 7 and 7 are partially attached to the recesses 6 and 6, and a part thereof is slightly in the flow path of the measurement tube 1 than the inner peripheral surface 5 of the measurement tube 1. Protruding. The electrode portions 7a and 7a including the gaskets 8 and 8 may all be accommodated in the recessed portions 6 and 6.
また、ライニング３をテフロンとする場合には、ガスケット８を省略してもよい。ライニング３がテフロンである場合、電極部７ａ，７ａの裏面とライニング３を直接接触させて密着できるので、電極部７ａ，７ａの裏面と窪み部６，６の底面６ａ，６ａとの間にはガスケット８，８を設ける必要はない。
Further, when the lining 3 is made of Teflon, the gasket 8 may be omitted. When the lining 3 is Teflon, the back surface of the electrode portions 7a and 7a and the lining 3 can be brought into direct contact with each other so that the lining 3 can be brought into close contact therewith, so that the gap between the back surface of the electrode portions 7a and 7a It is not necessary to provide the gaskets 8 and 8.
これに対し、絶縁性の樹脂粉末を粉体塗装してライニング３とする場合などには、電極部７ａ，７ａの裏面とライニング３とを直接接触させて密着させることが難しいので、電極部７ａ，７ａの裏面と窪み部６，６の底面６ａ，６ａとの間にはガスケット８，８を設けるようにすることが好ましい。
On the other hand, when the insulating resin powder is powder-coated to form the lining 3, it is difficult to bring the back surfaces of the electrode portions 7a and 7a and the lining 3 into direct contact with each other. , 7a and gaskets 8 and 8 are preferably provided between the bottom surfaces 6a and 6a of the recesses 6 and 6.
本実施例の電磁流量計では、測定管１の内周面５に対向して平面状の底面６ａ，６ａを有する窪み部６，６を設け、この窪み部６，６に平板状の電極部７ａ，７ａを有する信号電極７，７を取り付けている。このような構造とするこにより、小さい口径の測定管１に対しても、その測定管１の流路を配管断面積に比較して極端に狭くすることなく、大きな面積の信号電極７，７を取り付けることができ、小さい口径から大きい口径まで、フローノイズに強い大面積の信号電極７を共通で使用することができる、という効果が得られる。
In the electromagnetic flow meter of the present embodiment, recesses 6 and 6 having flat bottom surfaces 6a and 6a are provided facing the inner peripheral surface 5 of the measuring tube 1, and flat electrode portions are provided in the recesses 6 and 6 respectively. Signal electrodes 7 and 7 having 7a and 7a are attached. By adopting such a structure, even for a measurement tube 1 having a small diameter, the signal electrodes 7 and 7 having a large area can be obtained without making the flow path of the measurement tube 1 extremely narrow compared to the pipe cross-sectional area. From the small aperture to the large aperture, the large-area signal electrode 7 that is resistant to flow noise can be used in common.
また、本実施例では、測定管１の対向する窪み部６，６の底面が平面状となっているので、窪み部６，６の深さを浅くすることができる。すなわち、窪み部６，６の底面をテーパ状にした場合、電磁流量計の測定管１の外側に対し、測定管１のテーパ状の電極部位が大きく張り出すため、測定管１の外側に配置される電極締結のための部品や、コイルなどその他部品の寸法に制約が生じる。これに対し、窪み部６，６の底面を平面状とすれば、電極部７ａ，７ａを平面状として、窪み部６，６の深さを極力浅くできるため、電極締結のための部品や、コイルなどその他部品の寸法への影響を最小限とできる。
Further, in the present embodiment, since the bottom surfaces of the opposed recessed portions 6 and 6 of the measuring tube 1 are flat, the depth of the recessed portions 6 and 6 can be reduced. That is, when the bottom surfaces of the depressions 6 and 6 are tapered, the tapered electrode portion of the measuring tube 1 protrudes greatly from the outside of the measuring tube 1 of the electromagnetic flowmeter, so that it is arranged outside the measuring tube 1. There are restrictions on the dimensions of the parts for fastening the electrodes and other parts such as coils. On the other hand, if the bottom surfaces of the recesses 6 and 6 are planar, the electrode portions 7a and 7a can be planar and the depth of the recesses 6 and 6 can be made as shallow as possible. The influence on the dimensions of other parts such as coils can be minimized.
また、本実施例では、窪み部６，６の周囲の縁面６ｃ，６ｃをテーパやＲ曲面などで滑らかに測定管１の内径φにつながっているものとしているので、窪み部６，６の前後の測定管１内の流路と窪み部６，６での流体の流れの乱れを抑制でき、安定した流量計測を実現することができるようになる。
In the present embodiment, the peripheral surfaces 6c, 6c around the recesses 6, 6 are smoothly connected to the inner diameter φ of the measurement tube 1 with a taper or an R curved surface. Disturbances in the flow of fluid in the flow path and the depressions 6 and 6 in the front and rear measurement tubes 1 can be suppressed, and stable flow rate measurement can be realized.
本発明の電磁流量計は、配管内を流れる流体の流量を計測する機器として、プロセス制御など様々な分野で利用することが可能である。
The electromagnetic flow meter of the present invention can be used in various fields such as process control as a device for measuring the flow rate of a fluid flowing in a pipe.
Claims (3)
- 測定管内を流れる流体の流れ方向に対して直交する方向に磁界を作る励磁コイルと、この励磁コイルが作る磁界と直交する方向に対向して前記測定管の内周面に設けられた信号電極とを備え、
前記信号電極は、
電極部と、この電極部の裏面側に設けられた軸部とを有し、
前記測定管は、
当該測定管の内周面に対向して設けられた当該測定管の内径よりも外側に凹んだ平面状の底面を有する窪み部と、
この窪み部の底面に前記測定管の外周面に向けて貫通して設けられた貫通孔とを有し、
前記信号電極が前記窪み部に前記電極部の裏面側に設けられた軸部を前記貫通孔に通して取り付けられている
ことを特徴とする電磁流量計。 An excitation coil that creates a magnetic field in a direction orthogonal to the flow direction of the fluid flowing in the measurement tube, and a signal electrode provided on the inner peripheral surface of the measurement tube opposite to the direction perpendicular to the magnetic field created by the excitation coil; With
The signal electrode is
Having an electrode part and a shaft part provided on the back side of the electrode part,
The measuring tube is
A recess having a flat bottom surface recessed outward from the inner diameter of the measurement tube provided to face the inner peripheral surface of the measurement tube;
It has a through hole provided through the bottom surface of the hollow portion toward the outer peripheral surface of the measurement tube,
The electromagnetic flowmeter, wherein the signal electrode is attached to the hollow portion through a through hole provided on a shaft portion provided on the back side of the electrode portion. - 請求項１に記載された電磁流量計において、
前記電極部の裏面と前記窪み部の底面との間にシール性部材が介在されている
ことを特徴とする電磁流量計。 The electromagnetic flow meter according to claim 1,
An electromagnetic flow meter, wherein a sealing member is interposed between a back surface of the electrode portion and a bottom surface of the hollow portion. - 請求項１に記載された電磁流量計において、
前記窪み部は、前記内周面との境界部をなす周囲の縁面が滑らかに前記測定管の内径とつながっている
ことを特徴とする電磁流量計。 The electromagnetic flow meter according to claim 1,
In the electromagnetic flowmeter, the peripheral edge surface forming the boundary portion with the inner peripheral surface is smoothly connected to the inner diameter of the measurement tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008087641A JP2009243922A (en) | 2008-03-28 | 2008-03-28 | Electromagnetic flowmeter |
| JP2008-087641 | 2008-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2009119132A1 true WO2009119132A1 (en) | 2009-10-01 |
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ID=41113342
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2009/050372 WO2009119132A1 (en) | 2008-03-28 | 2009-01-14 | Electromagnetic flowmeter |
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| JP (1) | JP2009243922A (en) |
| WO (1) | WO2009119132A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931991A (en) * | 2017-12-15 | 2019-06-25 | 阿自倍尔株式会社 | The potentiometric detection electrode of electromagnetic flowmeter |
| WO2020207827A1 (en) * | 2019-04-12 | 2020-10-15 | Endress+Hauser SE+Co. KG | Hygienic tube adapter |
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| JPH01237418A (en) * | 1988-03-17 | 1989-09-21 | Yamatake Honeywell Co Ltd | Electrode structure in electromagnetic flowmeter |
| JPH0712605A (en) * | 1993-06-25 | 1995-01-17 | Toshiba Corp | Electromagnetic flowmeter |
| JP2006162615A (en) * | 2004-12-02 | 2006-06-22 | Krohne Ag | Magnetic induction flowmeter and manufacturing method of magnetic induction flowmeter |
| JP2007298398A (en) * | 2006-04-28 | 2007-11-15 | Aichi Tokei Denki Co Ltd | Electromagnetic flowmeter |
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2008
- 2008-03-28 JP JP2008087641A patent/JP2009243922A/en active Pending
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2009
- 2009-01-14 WO PCT/JP2009/050372 patent/WO2009119132A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01237418A (en) * | 1988-03-17 | 1989-09-21 | Yamatake Honeywell Co Ltd | Electrode structure in electromagnetic flowmeter |
| JPH0712605A (en) * | 1993-06-25 | 1995-01-17 | Toshiba Corp | Electromagnetic flowmeter |
| JP2006162615A (en) * | 2004-12-02 | 2006-06-22 | Krohne Ag | Magnetic induction flowmeter and manufacturing method of magnetic induction flowmeter |
| JP2007298398A (en) * | 2006-04-28 | 2007-11-15 | Aichi Tokei Denki Co Ltd | Electromagnetic flowmeter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109931991A (en) * | 2017-12-15 | 2019-06-25 | 阿自倍尔株式会社 | The potentiometric detection electrode of electromagnetic flowmeter |
| CN109931991B (en) * | 2017-12-15 | 2021-03-16 | 阿自倍尔株式会社 | Electrode for potential detection of electromagnetic flowmeter |
| WO2020207827A1 (en) * | 2019-04-12 | 2020-10-15 | Endress+Hauser SE+Co. KG | Hygienic tube adapter |
| CN113631895A (en) * | 2019-04-12 | 2021-11-09 | 恩德莱斯和豪瑟尔欧洲两合公司 | Sanitary pipe adapter |
| US20220205572A1 (en) * | 2019-04-12 | 2022-06-30 | Endress+Hauser SE+Co. KG | Hygienic tube adapter |
| US11781696B2 (en) | 2019-04-12 | 2023-10-10 | Endress+Hauser SE+Co. KG | Hygienic tube adapter |
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| Publication number | Publication date |
|---|---|
| JP2009243922A (en) | 2009-10-22 |
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