JPH0542343Y2 - - Google Patents
Info
- Publication number
- JPH0542343Y2 JPH0542343Y2 JP13893887U JP13893887U JPH0542343Y2 JP H0542343 Y2 JPH0542343 Y2 JP H0542343Y2 JP 13893887 U JP13893887 U JP 13893887U JP 13893887 U JP13893887 U JP 13893887U JP H0542343 Y2 JPH0542343 Y2 JP H0542343Y2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- electrode
- electrode body
- measuring tube
- 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 - Lifetime
Links
- 239000000919 ceramic Substances 0.000 claims description 26
- 239000004020 conductor Substances 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 16
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 9
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 9
- 238000005259 measurement Methods 0.000 description 8
- 230000035939 shock Effects 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 229910052697 platinum Inorganic materials 0.000 description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 239000011195 cermet Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 238000013020 steam cleaning Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
本考案はセラミツクス製の測定管を有するセラ
ミツクス電磁流量計に関するものである。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a ceramic electromagnetic flowmeter having a measuring tube made of ceramic.
更に詳述すれば、セラミツクス製の測定管を有
するセラミツクス電磁流量計の電極部分の改良に
関するものである。 More specifically, the present invention relates to an improvement in the electrode portion of a ceramic electromagnetic flowmeter having a measuring tube made of ceramics.
〈従来の技術〉
第２図は従来より一般に使用されている従来例
の構成説明図である。<Prior Art> FIG. 2 is a diagram illustrating the configuration of a conventional example that has been commonly used.
図において、１はセラミツクス製の円筒状の測
定管である。測定管１は、この場合は、アルミナ
（Al2O3）が用いられている。２１，２２は測定
管１に対向して配置され導電性粉末を混合して測
定管１と一体に焼成して形成された柱状のサーメ
ツトの電極部である。 In the figure, 1 is a cylindrical measuring tube made of ceramics. In this case, alumina (Al 2 O 3 ) is used for the measurement tube 1 . Reference numerals 21 and 22 denote columnar cermet electrode portions which are disposed opposite to the measuring tube 1 and are formed by mixing conductive powder and firing the mixture together with the measuring tube 1.
〈考案が解決しようとする問題点〉
このようなセラミツクス電磁流量計において
は、測定管１と電極部２１，２２との熱伝導度及
び熱膨脹係数に差があると、測定管１の内面に熱
衝撃が加えられた場合に、測定管１と電極部２
１，２２との境界及びその近傍に、測定管１の他
の内表面よりも大きな応力が発生する。<Problems to be solved by the invention> In such a ceramic electromagnetic flowmeter, if there is a difference in thermal conductivity and coefficient of thermal expansion between the measuring tube 1 and the electrode parts 21 and 22, heat will be generated on the inner surface of the measuring tube 1. When a shock is applied, the measurement tube 1 and the electrode part 2
1 and 22 and in the vicinity thereof, a larger stress is generated than on the other inner surfaces of the measuring tube 1.
例えば、アルミナ（Al2O3）の測定管１に、白
金とアルミナ（Pt−Al2O3）のサーメツトの電極
部２１，２２を埋め込んだ場合には、
アルミナの熱膨脹係数７〜８×10-6／℃＜
白金の熱膨脹係数8.9×10-6／℃
アルミナの熱伝導度21（Ｗ／ｍ・ｋ）＜
白金の熱伝導度72（Ｗ／ｍ・ｋ）
であるので、測定管１の内面が急加熱された場合
に、電極部２１，２２が先に膨脹し、測定管１と
電極部２１，２２との境界及びその近傍に大きな
応力が発生する。 For example, when cermet electrode parts 21 and 22 made of platinum and alumina (Pt-Al 2 O 3 ) are embedded in the measurement tube 1 made of alumina (Al 2 O 3 ), the coefficient of thermal expansion of alumina is 7 to 8 × 10 -6 /°C < Coefficient of thermal expansion of platinum 8.9×10 -6 /°C Thermal conductivity of alumina 21 (W/m・k) < The thermal conductivity of platinum 72 (W/m・k) Therefore, measuring tube 1 When the inner surface of the tube is rapidly heated, the electrode parts 21 and 22 expand first, and a large stress is generated at the boundary between the measuring tube 1 and the electrode parts 21 and 22 and in the vicinity thereof.
通常、プラント装置、特に、食品用の装置の場
合には、配管の蒸気洗浄がしばしば必要とされる
が、これに対しては、約150℃に耐える必要があ
る。 Generally, in plant equipment, particularly in the case of equipment for food products, steam cleaning of piping is frequently required, and for this, the equipment must be able to withstand approximately 150°C.
第２図従来例においては、測定管１の内面に急
激な熱衝撃が与えられると、例えば、100℃程度
の熱衝撃で、測定管１は即時破壊される。 In the conventional example shown in FIG. 2, if a sudden thermal shock is applied to the inner surface of the measuring tube 1, the measuring tube 1 will be immediately destroyed by a thermal shock of about 100° C., for example.
以上のことから、耐熱衝撃性の高いセラミツク
ス電磁流量計が得られない問題点があつた。 From the above, there was a problem that a ceramic electromagnetic flowmeter with high thermal shock resistance could not be obtained.
また、強度の高いセラミツクスは、コストも高
いので、測定管１の全部に使用する訳にはいかな
い。 Further, since high-strength ceramics are expensive, they cannot be used for the entire measuring tube 1.
本考案は、この問題点を、解決するものであ
る。 The present invention solves this problem.
本考案の目的は耐熱衝撃性が良好で安価なセラ
ミツクス電磁流量計を提供するにある。 The purpose of the present invention is to provide an inexpensive ceramic electromagnetic flowmeter with good thermal shock resistance.
〈問題を解決するための手段〉
この目的を達成するために、本考案は、測定流
体が流れるセラミツクス製の測定管中の電極部に
導電性物質が埋め込まれ焼成されたセラミツクス
電磁流量計において、前記電極部が前記セラミツ
クスの焼成温度より高い融点をもち所要の電気伝
導度を有する導電性物質からなる柱状の固体から
なる電極本体と該電極本体の周囲に同芯閉曲線状
に設けられ該電極本体と前記セラミツクスとの間
の熱膨張係数を有し筒状の固体からなるバツフア
体とを具備したことを特徴とするセラミツクス電
磁流量計を構成したものである。<Means for Solving the Problem> In order to achieve this objective, the present invention provides a ceramic electromagnetic flowmeter in which a conductive material is embedded and fired in the electrode part of a ceramic measuring tube through which a measuring fluid flows. The electrode portion includes an electrode body made of a columnar solid made of a conductive material having a melting point higher than the firing temperature of the ceramic and a required electrical conductivity, and the electrode body is provided in a concentric closed curve shape around the electrode body. and a buffer body made of a cylindrical solid having a coefficient of thermal expansion between that of the ceramics.
〈作用〉
以上の構成において、測定管の内面が急加熱さ
れた場合に、電極部が先に膨脹し、測定管と電極
部との境界及びその近傍に大きな応力が発生する
恐れがあるが、電極部の周囲には、バツフア体が
設けられているので、測定管が破壊しない。<Function> In the above configuration, when the inner surface of the measuring tube is rapidly heated, the electrode section may expand first, and large stress may be generated at and near the boundary between the measuring tube and the electrode section. Since a buffer body is provided around the electrode section, the measurement tube will not be destroyed.
〈実施例〉
第１図は本考案の一実施例の要部構成説明図
で、Ａは正面図、Ｂは平面図である。<Embodiment> FIG. 1 is an explanatory diagram of the main part of an embodiment of the present invention, in which A is a front view and B is a plan view.
図において、第２図と同一記号は同一機能を表
わす。 In the figure, the same symbols as in FIG. 2 represent the same functions.
１は耐熱衝撃性の良好な窒化珪素（Si3N4）よ
りなる、セラミツクス製の円筒状の測定管であ
る。 1 is a cylindrical measuring tube made of ceramics made of silicon nitride (Si 3 N 4 ) having good thermal shock resistance.
窒化珪素（Si3N4）の熱膨脹係数は３〜４×
10-6／℃である。 The thermal expansion coefficient of silicon nitride (Si 3 N 4 ) is 3 to 4×
10 -6 /℃.
３は電極本体３１とバツフア体３２とよりなる
電極部である。 Reference numeral 3 denotes an electrode portion consisting of an electrode body 31 and a buffer body 32.
電極本体３１はセラミツクスの焼成温度より高
い融点をもち所要の電気伝導度を有する導電性物
質からなる柱状の電極本体である。 The electrode body 31 is a columnar electrode body made of a conductive material having a melting point higher than the firing temperature of ceramics and a required electrical conductivity.
この場合は、白金（Pt）、タングステンカーバ
イト（WC）、チタン（Ti）や炭化珪素（SiC）が
用いられている。 In this case, platinum (Pt), tungsten carbide (WC), titanium (Ti), and silicon carbide (SiC) are used.
バツフア体３２は、第１、第２、第３バツフア
層３２１，３２２，３３３よりなり、電極本体３
１の周囲に同芯閉曲線状に設けられ、電極本体３
１とセラミツクスとの間の熱膨張係数を有してい
る。 The buffer body 32 consists of first, second, and third buffer layers 321, 322, and 333, and the electrode body 3
The electrode body 3 is provided in a concentric closed curve shape around the electrode body 3.
It has a coefficient of thermal expansion between 1 and that of ceramics.
例えばタングステンカーバイト（WC）の場
合、ニツケル（Ni）を添加して熱膨張係数をさ
げる（WC−Ni ４〜５×10-6／℃）ことが可能
であるので、ニツケルの含有率を変えたものを、
第１、第２、第３バツフア層３２１，３２２，３
２３に使用することができる。 For example, in the case of tungsten carbide (WC), it is possible to add nickel (Ni) to lower the coefficient of thermal expansion (WC-Ni 4 to 5 × 10 -6 /℃), so the content of nickel can be changed. what you had,
First, second, third buffer layers 321, 322, 3
It can be used for 23.
この場合は、電極本体３１はタングステンカー
バイト、第１バツフア層３２１はタングステンカ
ーバイトと0.5％ニツケル、第２バツフア層３２
２はタングステンカーバイトと1.0％ニツケル、
第３バツフア層３２３はタングステンカーバイト
と1.5％ニツケルが用いられている。 In this case, the electrode body 31 is made of tungsten carbide, the first buffer layer 321 is made of tungsten carbide and 0.5% nickel, and the second buffer layer 32 is made of tungsten carbide and 0.5% nickel.
2 is tungsten carbide and 1.0% nickel,
The third buffer layer 323 uses tungsten carbide and 1.5% nickel.
以上の構成において、測定管１の内面が急加熱
された場合に、電極本体３１が先に膨脹し、測定
管１と電極本体３１との境界及びその近傍に大き
な応力が発生する恐れがあるが、電極本体３１の
周囲にはバツフア体３２が設けられているので、
測定管１と電極本体３１との間の熱膨張係数が
徐々に変わり、クラツク等が発生しない。 In the above configuration, when the inner surface of the measurement tube 1 is rapidly heated, the electrode body 31 may expand first, and large stress may be generated at the boundary between the measurement tube 1 and the electrode body 31 and its vicinity. , since the buffer body 32 is provided around the electrode body 31,
The coefficient of thermal expansion between the measuring tube 1 and the electrode body 31 changes gradually, and cracks and the like do not occur.
この結果、電極本体３１と測定管１との間の熱
膨張係数の差が緩和され、耐熱性を改善すること
ができる。 As a result, the difference in thermal expansion coefficient between the electrode body 31 and the measurement tube 1 is alleviated, and heat resistance can be improved.
なお、前述の実施例においては、測定管１は窒
化珪素、電極本体３１はタングステンカーバイ
ト、バツフア体３２はタングステンカーバイトと
ニツケルの固定体と説明したが、これに限る事は
ないことは勿論である。 In the above embodiment, the measurement tube 1 is made of silicon nitride, the electrode body 31 is made of tungsten carbide, and the buffer body 32 is made of a fixed body of tungsten carbide and nickel, but it is of course not limited to this. It is.
〈考案の効果〉
以上説明したように、本考案は、測定流体が流
れるセラミツクス製の測定管中の電極部に導電性
物質が埋め込め焼成されたセラミツクス電磁流量
計において、前記電極部が前記セラミツクスの焼
成温度より高い融点をもち所要の電気伝導度を有
する導電性物質からなる柱状の固体からなる電極
本体と該電極本体の周囲に同芯閉曲線状に設けら
れ該電極本体と前記セラミツクスとの間の熱膨張
係数を有し筒状の固体からなるバツフア体とを具
備したことを特徴とするセラミツクス電磁流量計
を構成したので、電極本体と測定管との熱膨張係
数の差が緩和され、耐熱衝撃性を改善することが
できる。<Effects of the Invention> As explained above, the present invention provides a ceramic electromagnetic flowmeter in which a conductive material is embedded and fired in the electrode part of the ceramic measuring tube through which the measuring fluid flows, and in which the electrode part is made of the ceramic material. An electrode body made of a columnar solid made of a conductive material having a melting point higher than the firing temperature and a required electrical conductivity, and a concentric closed curve formed around the electrode body between the electrode body and the ceramics. Since the ceramic electromagnetic flowmeter is characterized by having a buffer body made of a cylindrical solid having a coefficient of thermal expansion, the difference in coefficient of thermal expansion between the electrode body and the measuring tube is alleviated, and the thermal shock resistance is improved. can improve sex.
したがつて、本考案によれば、耐熱衝撃性が良
好で安価なセラミツクス電磁流量計を実現するこ
とができる。 Therefore, according to the present invention, it is possible to realize an inexpensive ceramic electromagnetic flowmeter with good thermal shock resistance.
第１図は本考案の一実施例の要部構成説明図
で、Ａは正面図、Ｂは平面図、第２図は従来より
一般に使用されている従来例の構成説明図であ
る。
１……測定管、２１，２２……電極部、３……
電極、３１……電極本体、３２……バツフア体、
３２１……第１バツフア層、３２２……第２バツ
フア層、３２３……第３バツフア層。
FIG. 1 is an explanatory view of the main part of an embodiment of the present invention, in which A is a front view, B is a plan view, and FIG. 2 is an explanatory view of the configuration of a conventional example that has been commonly used. 1... Measuring tube, 21, 22... Electrode part, 3...
Electrode, 31... electrode body, 32... buffer body,
321...first buffer layer, 322...second buffer layer, 323...third buffer layer.
Claims (1)
電極部に導電性物質が埋め込み焼成されたセラミ
ツクス電磁流量計において、 前記電極部が前記セラミツクスの焼成温度より
高い融点をもち所要の電気伝導度を有する導電性
物質からなる柱状の固体からなる電極本体と該電
極本体の周囲に同芯閉曲線状に設けられ該電極本
体と前記セラミツクスとの間の熱膨張係数を有し
筒状の固体からなるバツフア体とを具備したこと
を特徴とするセラミツクス電磁流量計。[Claims for Utility Model Registration] A ceramic electromagnetic flowmeter in which a conductive material is embedded and fired in an electrode part of a ceramic measuring tube through which a measuring fluid flows, wherein the electrode part has a melting point higher than the firing temperature of the ceramic. An electrode body made of a columnar solid made of a conductive material having a required electrical conductivity, and a cylinder provided in a concentric closed curve shape around the electrode body and having a coefficient of thermal expansion between the electrode body and the ceramic. A ceramic electromagnetic flowmeter characterized by comprising a buffer body made of a shaped solid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13893887U JPH0542343Y2 (en) | 1987-09-11 | 1987-09-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13893887U JPH0542343Y2 (en) | 1987-09-11 | 1987-09-11 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6444420U JPS6444420U (en) | 1989-03-16 |
| JPH0542343Y2 true JPH0542343Y2 (en) | 1993-10-26 |
Family
ID=31401735
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13893887U Expired - Lifetime JPH0542343Y2 (en) | 1987-09-11 | 1987-09-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0542343Y2 (en) |
-
1987
- 1987-09-11 JP JP13893887U patent/JPH0542343Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6444420U (en) | 1989-03-16 |
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