JPS6213607B2 - - Google Patents
Info
- Publication number
- JPS6213607B2 JPS6213607B2 JP11436481A JP11436481A JPS6213607B2 JP S6213607 B2 JPS6213607 B2 JP S6213607B2 JP 11436481 A JP11436481 A JP 11436481A JP 11436481 A JP11436481 A JP 11436481A JP S6213607 B2 JPS6213607 B2 JP S6213607B2
- Authority
- JP
- Japan
- Prior art keywords
- lining
- electrodes
- fluororesin
- electrode
- electromagnetic flowmeter
- 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
- 229910052751 metal Inorganic materials 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 238000001514 detection method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000002844 melting Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Description
【発明の詳細な説明】
本発明は電磁流量計に係り、特にその電極に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic flowmeter, and particularly to electrodes thereof.
従来の容量電極式電磁流量計の一例を第１図に
示す。非磁性の金属管１の内壁に施されたライニ
ング２内には検出電極３およびシールド用電極４
が備えられている。これら電極３および４は金属
製であるので、ライニング２の材質がフツ素樹脂
である場合、金属の電極３および４とライニング
２との間では完全な接着が不可能となつている。
したがつて、金属管１内を流れる流体の圧力変動
または負圧などにより、ライニング２と電極３お
よび４との間が密着しおよび離間する現象が生じ
ている。このため、金属管１の断面積が変化し測
定誤差が生じていると共に、特に容量形電極の場
合には摩擦により電荷が生じ雑音の原因となつて
いる。 An example of a conventional capacitive electrode electromagnetic flowmeter is shown in FIG. A detection electrode 3 and a shielding electrode 4 are disposed within the lining 2 provided on the inner wall of the non-magnetic metal tube 1.
is provided. Since these electrodes 3 and 4 are made of metal, if the material of the lining 2 is fluororesin, complete adhesion between the metal electrodes 3 and 4 and the lining 2 is impossible.
Therefore, due to pressure fluctuations or negative pressure of the fluid flowing inside the metal tube 1, a phenomenon occurs in which the lining 2 and the electrodes 3 and 4 come into close contact with each other and then separate from each other. For this reason, the cross-sectional area of the metal tube 1 changes, causing measurement errors, and, especially in the case of capacitive electrodes, friction generates electric charges, which causes noise.
また、構造上測定流体から検出電極３を保護す
るためのライニング２の厚さを十分厚くできない
ので、測定流体が腐食性である場合流体中の成分
が薄いライニング２を通して検出電極３を腐食さ
せる心配があつて、検出電極３として高価な貴金
属を使用することもあつた。 Furthermore, because the thickness of the lining 2 to protect the detection electrode 3 from the measurement fluid cannot be made sufficiently thick due to its structure, there is a risk that if the measurement fluid is corrosive, components in the fluid may penetrate the thin lining 2 and corrode the detection electrode 3. In some cases, expensive noble metals were used as the detection electrode 3.
そこで、本発明は上述の欠点に鑑み、測定誤差
や雑音を除きかつ腐食を防止するようにした電磁
流量計の提供を目的とする。 SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, the present invention aims to provide an electromagnetic flowmeter that eliminates measurement errors and noise and prevents corrosion.
かかる目的を達成するため本発明としては、管
路内壁にフツ素樹脂で形成したライニングを有す
る電磁流量計において、
上記ライニングに備えられる電極を導電性フツ
素樹脂にて形成しこのライニングと電極とを融着
したことを特徴とする。 In order to achieve this object, the present invention provides an electromagnetic flowmeter having a lining made of fluororesin on the inner wall of the pipe, in which the electrodes provided in the lining are made of conductive fluororesin, and the lining and electrodes are connected together. It is characterized by being fused.
ここで、第２図以下を参照して本発明の実施例
を説明する。なお第１図と同一部分には同一符号
を付す。第２図は容量電極式電磁流量計の一例で
ある。非磁性の金属管１内に施されたライニング
２はフツ素樹脂で形成されている。一方、このラ
イニング２内には検出電極３′とシールド用のガ
ード電極４′とが備えられており、これら電極
３′および４′は導電性フツ素樹脂で形成されてい
る。この導電性フツ素樹脂はたとえばフツ素樹脂
内に黒鉛あるいは金属粉などの導電材料５を充填
し、全体として導電性を持たせたものである。こ
の場合、導電性フツ素樹脂は金属より導電率が悪
いけれども、電磁流量計の電極に接続される変換
器の入力インピーダンスが高いので導電率はさほ
ど良くなくとも差支えない。 Here, an embodiment of the present invention will be described with reference to FIG. 2 and subsequent figures. Note that the same parts as in FIG. 1 are given the same reference numerals. FIG. 2 is an example of a capacitive electrode type electromagnetic flowmeter. The lining 2 provided inside the non-magnetic metal tube 1 is made of fluororesin. On the other hand, a detection electrode 3' and a shielding guard electrode 4' are provided within the lining 2, and these electrodes 3' and 4' are made of conductive fluororesin. This conductive fluororesin is made by filling a fluororesin with a conductive material 5 such as graphite or metal powder, so that the entire body has conductivity. In this case, although the conductive fluororesin has lower conductivity than metal, it does not need to have very good conductivity because the input impedance of the converter connected to the electrodes of the electromagnetic flowmeter is high.
この検出電極３′およびガード電極４′をライニ
ング２に密着させるに当つては、第３図に示すよ
うにライニング２内に電極３′，４′となる導電性
フツ素樹脂フイルム３ａ，４ａを配置し、そして
管路内壁側から導電性フツ素樹脂フイルム３ａ，
４ａに向つて高周波を与えるとこの樹脂フイルム
３ａ，４ａ内にうず電流が発生し自己発熱により
導電性フツ素樹脂フイルム３ａ，４ａとライニン
グ２とは熱溶融により接着する。この場合、熱溶
融接着面を加圧治具６にて加熱密着させる必要が
ある。熱溶融接着ではライニング２のフツ素樹脂
と電極３′および４′のフツ素樹脂との両方の融点
が同じ同一材料の方が好ましく接着性能が向上す
る。 In order to bring the detection electrode 3' and guard electrode 4' into close contact with the lining 2, conductive fluororesin films 3a and 4a, which will become the electrodes 3' and 4', are placed inside the lining 2 as shown in FIG. conductive fluororesin film 3a,
When a high frequency wave is applied to 4a, eddy currents are generated in the resin films 3a, 4a, and the conductive fluorine resin films 3a, 4a and the lining 2 are bonded to each other by thermal melting due to self-heating. In this case, it is necessary to heat and bond the hot-melt adhesive surfaces together using a pressing jig 6. In hot melt bonding, it is preferable that the fluororesin of the lining 2 and the fluororesin of the electrodes 3' and 4' be made of the same material having the same melting point, and the adhesive performance will be improved.
第４図は測定流体に電極３ｂが接触する接液電
極式電磁流量計の例を示すものである。この場合
も、電極３ｂに導電性フツ素樹脂を用いて溶融接
着することで電極３ｂとライニング２とを密着さ
せることができる。この例では測定誤差の軽減、
腐食防止の他、電極３ｂとライニング２との間の
シール不良による液もれ事故の減少も図れる。 FIG. 4 shows an example of a wetted electrode electromagnetic flowmeter in which the electrode 3b contacts the fluid to be measured. In this case as well, the electrode 3b and the lining 2 can be brought into close contact with each other by melt-bonding the electrode 3b using a conductive fluororesin. In this example, reducing measurement errors,
In addition to preventing corrosion, it is also possible to reduce leakage accidents due to poor sealing between the electrode 3b and the lining 2.
接着方法としては前述した高周波による熱溶融
接着のほか、第５図に示すように電極３ｂに電流
を直接通してジユール熱による熱溶融接着でもよ
い。 As an adhesion method, in addition to the above-mentioned heat-melting bonding using high frequency, heat-melting bonding using Joule heat by directly passing an electric current through the electrode 3b as shown in FIG. 5 may be used.
以上実施例にて説明したように本発明によれ
ば、フツ素樹脂のライニングに備えられる電極と
してこれと同材質の導電性フツ素樹脂にて形成し
たことにより、ライニングと電極とを融着するこ
とができるのでより密に接着でき、よつて断面積
変化による測定誤差や雑音、また腐食に対する高
価な金属の使用は除去することができた。 As explained above in the embodiments, according to the present invention, the electrodes included in the fluororesin lining are made of the same conductive fluororesin, thereby making it possible to fuse the lining and the electrodes. This allows for tighter bonding, thereby eliminating measurement errors and noise due to changes in cross-sectional area, as well as the use of expensive metals that are resistant to corrosion.
第１図ａ，ｂは従来の電磁流量計の一例でａは
一部破断斜視図、ｂは断面図、第２図ａ，ｂない
し第５図は本発明による電磁流量計の実施例で、
第２図ａは一例の断面図、第２図ｂは第２図ａの
部分拡大断面図、第３図は接着方法の説明のため
の断面図、第４図は他の例の断面図、第５図は他
の例の接着方法の説明のための拡大断面図であ
る。
図面中、１は金属管、２はライニング、３，
３′は検出電極、４，４′はガード電極である。
Figures 1a and 1b are examples of conventional electromagnetic flowmeters, where a is a partially cutaway perspective view and b is a cross-sectional view, and Figures 2a, b to 5 are examples of electromagnetic flowmeters according to the present invention.
FIG. 2a is a sectional view of an example, FIG. 2b is a partially enlarged sectional view of FIG. 2a, FIG. 3 is a sectional view for explaining the bonding method, and FIG. 4 is a sectional view of another example. FIG. 5 is an enlarged sectional view for explaining another example of the bonding method. In the drawing, 1 is a metal tube, 2 is a lining, 3,
3' is a detection electrode, and 4 and 4' are guard electrodes.
Claims (1)
を有する電磁流量計において、上記ライニングに
備えられる電極を導電性フツ素樹脂にて形成し上
記ライニングと上記電極とを融着したことを特徴
とする電磁流量計。1. An electromagnetic flowmeter having a lining made of fluororesin on the inner wall of the pipe, characterized in that the electrodes provided in the lining are made of conductive fluororesin, and the lining and the electrodes are fused. Electromagnetic flowmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11436481A JPS5817318A (en) | 1981-07-23 | 1981-07-23 | Electromagnetic flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11436481A JPS5817318A (en) | 1981-07-23 | 1981-07-23 | Electromagnetic flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5817318A JPS5817318A (en) | 1983-02-01 |
| JPS6213607B2 true JPS6213607B2 (en) | 1987-03-27 |
Family
ID=14635864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11436481A Granted JPS5817318A (en) | 1981-07-23 | 1981-07-23 | Electromagnetic flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5817318A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014041114A (en) * | 2012-08-21 | 2014-03-06 | Krohne A.G. | Electromagnetic induction flowmeter and manufacturing method of electromagnetic induction flowmeter |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2289514A (en) * | 1994-05-13 | 1995-11-22 | Peek Measurement Ltd | A liner for determining characteristics of fluid within a conduit |
| DE59505302D1 (en) * | 1994-10-07 | 1999-04-15 | Krohne Messtechnik Kg | MAGNETIC-INDUCTIVE MEASURING DEVICE FOR FLOWING MEDIA |
| US6711947B2 (en) | 2001-06-13 | 2004-03-30 | Rem Scientific Enterprises, Inc. | Conductive fluid logging sensor and method |
| CA2825499A1 (en) * | 2003-10-01 | 2005-04-14 | Rem Scientific Enterprises, Inc. | Apparatus and method for fluid flow measurement with sensor shielding |
| US7155983B2 (en) * | 2005-02-04 | 2007-01-02 | Entegris, Inc. | Magnetic flow meter with unibody construction and conductive polymer electrodes |
| JP4842766B2 (en) * | 2006-10-31 | 2011-12-21 | 株式会社山武 | Capacity type electromagnetic flow meter |
| CA2667498C (en) | 2006-11-10 | 2013-01-15 | Rem Scientific Enterprises, Inc. | Rotating fluid measurement device and method |
-
1981
- 1981-07-23 JP JP11436481A patent/JPS5817318A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014041114A (en) * | 2012-08-21 | 2014-03-06 | Krohne A.G. | Electromagnetic induction flowmeter and manufacturing method of electromagnetic induction flowmeter |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5817318A (en) | 1983-02-01 |
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