JP2545656B2 - Manufacturing method of electrode for electromagnetic flow meter - Google Patents
Manufacturing method of electrode for electromagnetic flow meterInfo
- Publication number
- JP2545656B2 JP2545656B2 JP3289410A JP28941091A JP2545656B2 JP 2545656 B2 JP2545656 B2 JP 2545656B2 JP 3289410 A JP3289410 A JP 3289410A JP 28941091 A JP28941091 A JP 28941091A JP 2545656 B2 JP2545656 B2 JP 2545656B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- lining material
- mounting hole
- manufacturing
- measuring tube
- 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 - Fee Related
Links
Landscapes
- Measuring Volume Flow (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、測定管内を流れる導電
性流体の流量を測定する電磁流量計における電極の製造
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an electrode in an electromagnetic flowmeter for measuring a flow rate of a conductive fluid flowing in a measuring tube.
【０００２】[0002]
【従来の技術】電磁流量計は、電磁誘導現象を利用して
測定管内を流れる導電性流体の流量を電気信号に変換し
て測定するもので、両端部外周面にフランジを有する測
定管と、測定管を導電性流体から電気的に絶縁すると共
に耐食性をもたせるため測定管の内壁面およびフランジ
外側面を被覆する弗素樹脂、ポリウレタン等からなるラ
イニング材と、測定管の外周面に対向して配設され被測
定流体の流れ方向と直交する方向の磁界を形成する一対
の鞍型励磁コイルと、測定管１の中央部に前記磁界と直
交するよう対向して貫通配置され内端が被測定流体と接
液する一対の電極と、測定管と被測定流体を接地してこ
れらを同電位にするためフランジ外側面に配設されたア
ースリングと、変換器等で概ね構成されている。電極と
しては、一般に白金、チタン等の貴金属によって製作さ
れ、ライニング材に設けた電極取付孔に内挿または外挿
方式にて嵌合固定されるが、最近では弗素樹脂等の母材
中にカーボン繊維等の導電材料を混入して電極を製作
し、これを電極取付孔に嵌合してライニング材に超音波
溶着したものが提案されている。2. Description of the Related Art An electromagnetic flow meter converts the flow rate of a conductive fluid flowing in a measuring pipe into an electric signal by utilizing an electromagnetic induction phenomenon, and measures the measuring pipe having flanges on both outer peripheral surfaces. In order to electrically insulate the measuring tube from the conductive fluid and to provide corrosion resistance, a lining material made of fluororesin, polyurethane, etc. that covers the inner wall surface and the flange outer surface of the measuring tube and the outer surface of the measuring tube are arranged facing each other A pair of saddle-type excitation coils that are provided and that form a magnetic field in a direction orthogonal to the flow direction of the fluid to be measured, and the inner ends of the fluid to be measured that are arranged at the center of the measuring tube 1 so as to face each other orthogonally to the magnetic field. It is generally composed of a pair of electrodes that come into contact with the fluid, an earth ring disposed on the outer surface of the flange to ground the measuring tube and the fluid to be measured to the same potential, and a converter. The electrodes are generally made of a noble metal such as platinum or titanium, and are fitted and fixed in the electrode mounting holes provided in the lining material by an internal or external method, but recently, carbon has been added to the base material such as fluororesin. There is proposed a method in which a conductive material such as fiber is mixed to manufacture an electrode, which is fitted into an electrode mounting hole and ultrasonically welded to a lining material.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、弗素樹
脂等の母材中にカーボン繊維等の導電材料を混入して形
成した電極を電極取付孔に嵌合してライニング材に超音
波溶着した上記の電極取付構造にあっては、電極の導電
度を高めるため導電材料の混入割合を多くすると、電極
をライニング材に溶着することが難しく、ライニング材
と電極間の液シールに対する信頼性が低下し、液漏れし
易いという問題があった。However, an electrode formed by mixing a conductive material such as carbon fiber into a base material such as a fluororesin is fitted into the electrode mounting hole and ultrasonically welded to the lining material. In the electrode mounting structure, if the mixing ratio of the conductive material is increased in order to increase the conductivity of the electrode, it is difficult to weld the electrode to the lining material, and the reliability of the liquid seal between the lining material and the electrode decreases, There was a problem that the liquid easily leaked.
【０００４】したがって、本発明は上記したような従来
の問題点に鑑みてなされたものであり、その目的とする
ところは、電極とライニング材間のシール性能を向上さ
せて液漏れを確実に防止し得るようにした電磁流量計用
電極の製造方法を提供することにある。Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to improve the sealing performance between the electrode and the lining material to surely prevent liquid leakage. Another object of the present invention is to provide a method of manufacturing an electrode for an electromagnetic flow meter, which can be manufactured.
【０００５】[0005]
【課題を解決するための手段】本発明は上記目的を達成
するためになされたもので、その第１の発明は、測定管
の内壁面に内張りされたライニング材を貫通して形成さ
れた電極取付孔に、ライニング材と同一材料からなる母
材中に粉状導電材料を混入して形成した電極を嵌挿し、
しかる後この電極の両端に通電部材を接続し、これら通
電部材への通電により前記電極を加熱しライニング材と
電極とを溶着するようにしたものである。第２の発明
は、測定管の内壁面に内張りされたライニング材に測定
管中心に向かって縮小するテーパ状の電極取付孔を貫通
形成し、この電極取付孔に、ライニング材と同一材料か
らなる母材中に粉状導電材料を混入して形成した電極を
嵌挿し、しかる後この電極の両端に通電部材を接続し、
これら通電部材への通電により前記電極を加熱しライニ
ング材と電極とを溶着するようにしたものである。The present invention has been made to achieve the above object, and a first invention thereof is an electrode formed by penetrating a lining material lined on an inner wall surface of a measuring tube. In the mounting hole, insert the electrode formed by mixing the powdery conductive material in the base material made of the same material as the lining material,
After that, a current-carrying member is connected to both ends of the electrode, and the current is applied to the current-carrying member to heat the electrode to weld the lining material and the electrode. According to a second aspect of the present invention, a tapered electrode attachment hole that shrinks toward the center of the measurement pipe is formed through the lining material lined on the inner wall surface of the measurement pipe, and the electrode attachment hole is made of the same material as the lining material. Insert the electrode formed by mixing the powdery conductive material in the base material, and then connect the current-carrying member to both ends of this electrode,
By energizing these energizing members, the electrodes are heated to weld the lining material and the electrodes.
【０００６】[0006]
【作用】本発明において、通電部材は通電されると、ジ
ュール熱によって電極を加熱しライニング材に溶着す
る。テーパ状の電極取付孔は電極に高い機械加工精度を
要求せず、電極の隙間のない密着を可能にし、また小径
側は通電時の抵抗が大で、加熱、溶着効果を高める。In the present invention, the energizing member, when energized, heats the electrode by Joule heat and welds it to the lining material. The tapered electrode mounting hole does not require high machining accuracy for the electrode and enables close contact without gaps between the electrodes. Also, the small diameter side has a large resistance when energized, and enhances heating and welding effects.
【０００７】[0007]
【実施例】以下、本発明を図面に示す実施例に基づいて
詳細に説明する。図１は本発明に係る電磁流量計用電極
の製造方法を説明するための断面図である。同図におい
て、１は測定管で両端開放の筒状体に形成され、両端外
周部にはフランジ２、３がそれぞれ一体に設けられ、ま
た外周面中央部には一対の電極挿入孔４、５が測定管１
の軸線と直交する方向において対向するよう同軸に貫設
されている。６はモールド成形によって測定管１の内壁
面７およびフランジ外側面８に形成されたライニング材
で、このライニング材６は弗素樹脂等からなり、前記各
電極挿入孔４、５に対応する部位には電極取付孔９、１
０がそれぞれ貫通形成されている。１１は電極取付孔９
（１０も同様）に嵌合された電極で、この電極１１は予
めライニング材６と同一材料からなる母材（弗素樹脂、
ネオプレン等）中に耐食性が要求される場合は白金、チ
タン、モネル、ハステロイ、炭素粒子、炭素繊維等の粉
状導電材料を、そうでない場合はニッケル、タングステ
ン、ステンレス等の粉状導電材料を混入して形成され
る。１２、１３は電極１１の両端面にそれぞれ接続され
た通電部材で、これらをコード１４によって電源に接続
し、電流を一定時間流すと、ジュール熱によって電極１
１の表面と、電極取付孔９の周面が溶けて互いに溶着さ
れ、もって電極１１の取付けを完了する。すなわち、本
発明は抵抗溶接法によって電極１１をライニング材６の
電極取付孔９に溶着固定するようにしたものである。こ
の場合、加熱温度は、電流、電圧および通電時間によっ
て決まり、正確に温度管理される。弗素樹脂からなるラ
イニング材６の場合、溶融温度範囲は狭く、温度が上が
り過ぎると、昇華したり、炭化したりするので、厳密に
温度管理することが望ましい。また、上記実施例はライ
ニング材６をモールドした測定管１に適用した場合を示
したが、図２に示すようにアウタータイプの測定管１に
も適用実施し得ることは勿論である。アウタータイプの
場合はストレートな筒状体に形成されたライニング材６
の測定管１から突出する両端部を、電極１１の溶着後
（もしくは溶着前）にフレア加工してフランジ外側面８
に溶着すればよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view for explaining a method of manufacturing an electrode for an electromagnetic flow meter according to the present invention. In the figure, reference numeral 1 denotes a measuring tube which is formed into a cylindrical body with both ends open, flanges 2 and 3 are integrally provided on the outer peripheral portions of both ends, and a pair of electrode insertion holes 4 and 5 are provided in the central portion of the outer peripheral surface. Measuring tube 1
Are coaxially provided so as to face each other in a direction orthogonal to the axis of the. Reference numeral 6 denotes a lining material formed on the inner wall surface 7 and the flange outer surface 8 of the measuring tube 1 by molding. The lining material 6 is made of a fluororesin or the like, and is provided in the portions corresponding to the electrode insertion holes 4 and 5. Electrode mounting holes 9, 1
0 is formed through each. 11 is an electrode mounting hole 9
(10 is also the same), and this electrode 11 is a base material (fluorine resin, made of the same material as the lining material 6 in advance).
When corrosion resistance is required, powdered conductive materials such as platinum, titanium, monel, hastelloy, carbon particles, carbon fibers, etc. are mixed in, and nickel, tungsten, stainless steel, and other powdered conductive materials are mixed. Formed. Reference numerals 12 and 13 denote current-carrying members respectively connected to both end surfaces of the electrode 11. When these are connected to a power source by a cord 14 and a current is passed for a certain period of time, Joule heat causes the electrode 1 to move.
The surface of No. 1 and the peripheral surface of the electrode mounting hole 9 are melted and welded to each other, thereby completing the mounting of the electrode 11. That is, in the present invention, the electrode 11 is welded and fixed to the electrode mounting hole 9 of the lining material 6 by the resistance welding method. In this case, the heating temperature is determined by the current, voltage and energization time, and the temperature is accurately controlled. In the case of the lining material 6 made of fluororesin, the melting temperature range is narrow, and if the temperature rises too much, it sublimes or carbonizes, so it is desirable to strictly control the temperature. Further, although the above-mentioned embodiment shows the case where it is applied to the measuring pipe 1 in which the lining material 6 is molded, it is needless to say that it can be applied to the outer type measuring pipe 1 as shown in FIG. In the case of the outer type, the lining material 6 is formed into a straight tubular body.
Both ends projecting from the measuring tube 1 are flared after the electrode 11 is welded (or before welding) to form the flange outer surface 8
It can be welded to.
【０００８】かくしてこのような電極１１の製造方法に
あっては、抵抗溶接法によって電極１１をライニング材
６の電極取付孔９に溶着固定しているので、実質的にシ
ール部をなくすことができる。したがって、これら両者
間の液シールがきわめて良好且つ確実で、電極取付孔９
からの液漏れを確実に防止することができる。また、抵
抗溶接法は加熱温度の制御が容易である。Thus, in the method of manufacturing the electrode 11 as described above, since the electrode 11 is welded and fixed to the electrode mounting hole 9 of the lining material 6 by the resistance welding method, the seal portion can be substantially eliminated. . Therefore, the liquid seal between them is very good and reliable, and the electrode mounting hole 9
It is possible to reliably prevent liquid leakage from the. In addition, the resistance welding method makes it easy to control the heating temperature.
【０００９】図３(a)、(b)は、本発明に係る電極の製造
方法において、溶着および液密の信頼性を向上させるよ
うにした例を示す図である。ライニング材６と電極１１
の溶着が不均一で隙間があると、液漏れを生じるばかり
か、液置換の際電磁流量計の出力が不安定になる可能性
が有るため、溶着および液密の信頼性が要求される。同
(a) 図は電極１１の外端面中央に円錐状の凹部２０を形
成し、通電部材１２に前記凹部２０に嵌合する円錐状の
突部２１を突設し、通電部材１２、１３への通電によっ
て電極１１の表面が溶け始めた際、通電部材１２を押圧
して溶けた電極１１を外側に押し広げ、電極取付孔９に
電極１１の周面全体を溶着するようにしたものである。
(b) 図は単に通電部材１２をガイド２２に沿って電極１
１に押し付け、溶着するようにしたものである。このよ
うな加圧抵抗溶着法による電極の製造方法においては、
電極取付孔９および電極１１の加工精度が悪く、これら
両者間に多少の隙間が生じていても、電極１１を全周に
亙って均一に溶着することができるため、溶着および液
密の信頼性を向上させることができるものである。FIGS. 3 (a) and 3 (b) are views showing an example in which the reliability of welding and liquid tightness is improved in the method of manufacturing an electrode according to the present invention. Lining material 6 and electrode 11
If the welding is uneven and there is a gap, liquid leakage may occur and the output of the electromagnetic flow meter may become unstable during liquid replacement, so reliability of welding and liquid tightness is required. same
(a) In the figure, a conical concave portion 20 is formed at the center of the outer end surface of the electrode 11, and a conical protrusion 21 that fits into the concave portion 20 is provided on the current-carrying member 12 so as to extend to the current-carrying members 12 and 13. When the surface of the electrode 11 starts to be melted by energization, the current-carrying member 12 is pressed to spread the melted electrode 11 to the outside, and the entire peripheral surface of the electrode 11 is welded to the electrode mounting hole 9.
(b) In the drawing, the current-carrying member 12 is simply arranged along the guide 22 into the electrode
It is pressed against 1 and welded. In the method of manufacturing an electrode by such a pressure resistance welding method,
Even if the machining accuracy of the electrode mounting hole 9 and the electrode 11 is poor and there is some gap between them, the electrode 11 can be welded uniformly over the entire circumference. It is possible to improve the property.
【００１０】図４(a) 〜(d) は溶着および液密の信頼性
を向上させる他の方法を示す図である。同(a) 図は電極
取付孔９を測定管１の中心に向かって縮小するテーパ孔
とし、電極１１を前記電極取付孔９に嵌合し得る截頭円
錐状に形成した例、(b) 図は電極取付孔９を小径孔部９
Ａと、測定管１の中心に向かって縮小するテーパ孔部９
Ｂとで構成し、電極をこの電極取付孔９と略同形状に形
成した例、(c) 図は電極取付孔９と電極１１にねじ溝２
４をそれぞれ形成し、電極１１を電極取付孔９にねじ込
むようにした例、そして(d) 図は電極取付孔９をテーパ
状のねじ孔とし、電極をこの電極取付孔９にねじ込むよ
うにした例を示す。このような構成においては多少の機
械加工精度が悪くても電極取付孔９と電極１１を良好に
且つ大きな接触面積を以て接触させることができ、溶着
および液密の信頼性を向上させることができるという利
点を有している。また、(a) 、(b)および(d)図に示すよ
うに電極取付孔９の穴径を変え、内側端部の穴径を外側
端部より小さくしておくと、通電時に電極１１の接液側
端部の電気抵抗値が反接液側端部より大きくなるため、
発熱量が多く、接液側端部の溶着効果を反接液側端部よ
り高くすることができるという利点も有する。FIGS. 4A to 4D are diagrams showing another method for improving the reliability of welding and liquid tightness. The same figure (a) shows an example in which the electrode mounting hole 9 is a tapered hole that shrinks toward the center of the measuring tube 1, and the electrode 11 is formed in a truncated cone shape that can be fitted into the electrode mounting hole 9, (b) The figure shows the electrode mounting hole 9 with a small diameter hole 9
A and a tapered hole portion 9 that shrinks toward the center of the measuring tube 1.
An example in which the electrode is formed in substantially the same shape as the electrode mounting hole 9 and is configured by B, and (c) shows the screw groove 2 in the electrode mounting hole 9 and electrode 11.
4 is formed, and the electrode 11 is screwed into the electrode mounting hole 9, and (d) in the figure, the electrode mounting hole 9 is a tapered screw hole, and the electrode is screwed into the electrode mounting hole 9. Here is an example: In such a configuration, the electrode mounting hole 9 and the electrode 11 can be satisfactorily brought into contact with each other with a large contact area even if the machining accuracy is somewhat poor, and the reliability of welding and liquid tightness can be improved. Have advantages. Further, as shown in FIGS. (A), (b) and (d), the hole diameter of the electrode mounting hole 9 is changed so that the hole diameter of the inner end portion is smaller than that of the outer end portion. Since the electric resistance value at the liquid contact side end is larger than the liquid contact side end,
There is also an advantage that a large amount of heat is generated and the welding effect at the liquid contact side end can be made higher than that at the liquid contact side end.
【００１１】なお、本発明は上記実施例に特定されるも
のではなく、種々の変更、変形が可能であり、例えば図
５に示すように電極１１の接液側端部を反接液側端部よ
り大径とすれば、測定管１内の内圧に十分耐え得、耐圧
特性を向上させることができる。The present invention is not limited to the above embodiment, but various changes and modifications are possible. For example, as shown in FIG. 5, the liquid contact side end of the electrode 11 is opposite to the liquid contact side end. If the diameter is larger than that of the portion, it is possible to sufficiently withstand the internal pressure in the measuring tube 1 and improve the pressure resistance characteristics.
【００１２】[0012]
【発明の効果】以上説明したように本発明に係る電磁流
量計用電極の製造方法によれば、ライニング材の電極取
付孔に電極を嵌挿し、抵抗溶接法によって溶着固定する
ようにしたので、実質的にシール部位をなくすことがで
きる。この結果、シール性能が高く、電極取付孔からの
液漏れを確実に防止することができ、また電極取付孔を
測定管の中心に向かって小径となるテーパ孔とすると、
高い機械加工精度でなくても電極の周面全体を電極取付
孔に密接させることが可能であり、また接液側端部の溶
着効果を反接液側端部より大きくすることができる。As described above, according to the method for manufacturing an electrode for an electromagnetic flow meter according to the present invention, the electrode is fitted in the electrode mounting hole of the lining material and is welded and fixed by the resistance welding method. The seal area can be substantially eliminated. As a result, the sealing performance is high, liquid leakage from the electrode mounting hole can be reliably prevented, and if the electrode mounting hole is a tapered hole with a smaller diameter toward the center of the measuring tube,
The entire peripheral surface of the electrode can be brought into close contact with the electrode mounting hole without high machining accuracy, and the welding effect at the liquid contact side end can be made greater than that at the non-liquid contact side end.
【図１】本発明に係る電磁流量計用電極の製造方法の一
実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of a method for manufacturing an electrode for an electromagnetic flow meter according to the present invention.
【図２】フレアタイプの測定管に実施した場合の例を示
す図である。FIG. 2 is a diagram showing an example in which the measurement is performed on a flare type measuring tube.
【図３】(a) 、(b) は加圧抵抗溶着による電極の製造方
法を示す図である。3 (a) and 3 (b) are views showing a method for manufacturing an electrode by pressure resistance welding.
【図４】(a) 〜(d)は電極取付孔と電極の種々の変形例
を示す図である。4A to 4D are views showing various modifications of an electrode mounting hole and an electrode.
【図５】電極の更に他の変形例を示す図である。FIG. 5 is a diagram showing still another modified example of the electrode.
１ 測定管 ２、３ フランジ ４、５ 電極挿通孔 ６ ライニング材 ９、１０ 電極取付孔 １１ 電極 １２、１３ 通電部材 1 Measuring Tube 2, 3 Flange 4, 5 Electrode Insertion Hole 6 Lining Material 9, 10 Electrode Mounting Hole 11 Electrode 12, 13 Conductive Member
Claims (2)
グ材を貫通して形成された電極取付孔に、ライニング材
と同一材料からなる母材中に粉状導電材料を混入して形
成した電極を嵌挿し、しかる後この電極の両端に通電部
材を接続し、これら通電部材への通電により前記電極を
加熱しライニング材と電極とを溶着するようにしたこと
を特徴とする電磁流量計用電極の製造方法。1. An electrode formed by mixing a powdery conductive material into a base material made of the same material as the lining material in an electrode mounting hole formed by penetrating the lining material lined on the inner wall surface of the measuring tube. Electrodes for electromagnetic flowmeter, characterized in that a current-carrying member is connected to both ends of this electrode, and the electrodes are heated by energizing the current-carrying members to weld the lining material and the electrode. Manufacturing method.
グ材に測定管中心に向かって縮小するテーパ状の電極取
付孔を貫通形成し、この電極取付孔にライニング材と同
一材料からなる母材中に粉状導電材料を混入して形成し
た電極を嵌挿し、しかる後この電極の両端に通電部材を
接続し、これら通電部材への通電により前記電極を加熱
しライニング材と電極とを溶着するようにしたことを特
徴とする電磁流量計用電極の製造方法。2. A base material made of the same material as the lining material is formed through a lining material lined on the inner wall surface of the measuring pipe, and a tapered electrode mounting hole that shrinks toward the center of the measuring pipe is formed therethrough. An electrode formed by mixing a powdery conductive material therein is inserted, and then an energizing member is connected to both ends of this electrode, and the electrode is heated by energizing these energizing members to weld the lining material and the electrode. A method for manufacturing an electrode for an electromagnetic flowmeter, characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3289410A JP2545656B2 (en) | 1991-10-09 | 1991-10-09 | Manufacturing method of electrode for electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3289410A JP2545656B2 (en) | 1991-10-09 | 1991-10-09 | Manufacturing method of electrode for electromagnetic flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0599716A JPH0599716A (en) | 1993-04-23 |
| JP2545656B2 true JP2545656B2 (en) | 1996-10-23 |
Family
ID=17742883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3289410A Expired - Fee Related JP2545656B2 (en) | 1991-10-09 | 1991-10-09 | Manufacturing method of electrode for electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2545656B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5817948A (en) * | 1997-01-21 | 1998-10-06 | Elsag International N.V. | Electromagnetic flowmeter with non-protruding contacting electrodes and method for producing the same |
| DE102012017904A1 (en) * | 2012-08-21 | 2014-03-20 | Krohne Ag | Magnetic-inductive flowmeter and method for its manufacture |
-
1991
- 1991-10-09 JP JP3289410A patent/JP2545656B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0599716A (en) | 1993-04-23 |
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