JPS60253962A - Metallic electrode for flame sensor - Google Patents
Metallic electrode for flame sensorInfo
- Publication number
- JPS60253962A JPS60253962A JP59111975A JP11197584A JPS60253962A JP S60253962 A JPS60253962 A JP S60253962A JP 59111975 A JP59111975 A JP 59111975A JP 11197584 A JP11197584 A JP 11197584A JP S60253962 A JPS60253962 A JP S60253962A
- Authority
- JP
- Japan
- Prior art keywords
- flame
- electrode
- alloy
- temperature
- al2o3
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/126—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electrical or electromechanical means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
ｌ） 目 的
（１）発明の利用分野
ガスバーナーや石油バーナー等の火炎中に金属電極を挿
入し、バーナーと電極間に交流電圧を印加すると、電極
から火炎を通って微弱電流が流れろが、この微弱電流を
測定することで火炎の検出が成される。この微弱電流が
流れる理由は、高温の火炎中で電離した僅かなイオンが
電極へ移動するためで、火炎中の整流作用が流れる電流
を直流とさせる。[Detailed description of the invention] l) Purpose (1) Field of application of the invention When a metal electrode is inserted into the flame of a gas burner, oil burner, etc. and an alternating current voltage is applied between the burner and the electrode, the flame passes from the electrode. Although a weak current flows through the flame, the flame can be detected by measuring this weak current. The reason why this weak current flows is that a small amount of ions dissociated in the high-temperature flame move to the electrodes, and the rectifying action in the flame causes the current to flow as a direct current.
ところで、この種の火炎センサー用金属電極は、直接高
温（１０００℃〜１３００℃）の火炎中に挿入するので
長時間安定して使用可能な材料の選択が重要である。本
発明は、このような金属電極に利用される。By the way, since this type of metal electrode for a flame sensor is directly inserted into a high temperature (1000° C. to 1300° C.) flame, it is important to select a material that can be used stably for a long time. The present invention is utilized for such metal electrodes.
（２）従来技術との関連における本発明の技術的課題 現在使用される金属電極の代表例は、 Ｆｅ−Ｃｒ−Ａｔ系やＮｉ −Ｃｒ系の合金材である。(2) Technical issues of the present invention in relation to the prior art Typical examples of metal electrodes currently used are: It is an alloy material of Fe-Cr-At type or Ni-Cr type.
特に、Ｆｅ−０ｒ−＃系合金材は、大気中或いは酸化性
雰囲気中での高温耐蝕特性が他の金属電極より優れてい
るため、この種の火炎センサー用金属電極として使用さ
れている例が多い。しかしながら、Ｆｅ−Ｃｒ −Ａｔ
系合金は、大気中或いは酸化性雰囲気中では優れた高温
耐蝕特性を示すが、還元性雰囲気中において高温で使用
すると、浸炭し構成成分であるＣｒ ’ｐａｔ等と反応
し炭化物をつくり耐蝕特性が劣化する。ガスバーナーや
石油バーナーは、その燃料ガスと空気との混合比の調節
によって、その火炎が還元炭化性となる。したがって、
このような火炎券囲気中で在来のＦｅ−Ｃｒ−ル系合金
の火炎センサー用電極を長時間使用すると、材質劣化を
生じセンサーとしての機能が維持し得なくなることがあ
る。In particular, Fe-0r-# alloy materials have better high-temperature corrosion resistance in the air or oxidizing atmosphere than other metal electrodes, so there are examples of them being used as metal electrodes for this type of flame sensor. many. However, Fe-Cr-At
These alloys exhibit excellent high-temperature corrosion resistance in the air or in an oxidizing atmosphere, but when used at high temperatures in a reducing atmosphere, they carburize and react with constituent components such as Cr'pat, forming carbides, resulting in poor corrosion resistance. to degrade. In gas burners and oil burners, the flame becomes reductively carbonized by adjusting the mixture ratio of fuel gas and air. therefore,
If a flame sensor electrode made of a conventional Fe-Cr-based alloy is used for a long time in such a flame ticket atmosphere, the material may deteriorate and the function as a sensor may no longer be maintained.
本発明は、それ故に還元浸炭性の強い火炎中で使用して
も耐蝕性に富み且つ通電性を損なわなく、電極としての
充分な機能を長時間に亘り維持する火炎センサー用金属
電極を提供することを目的と１−る。Therefore, the present invention provides a metal electrode for a flame sensor that is highly corrosion resistant and does not impair electrical conductivity even when used in flames with strong reductive carburizing properties, and maintains sufficient function as an electrode for a long period of time. The purpose is 1-.
２）構 成
（１）上記目的達成のための技術的手段本発明において
は、３〜８重童％のＡｔ。2) Structure (1) Technical means for achieving the above object In the present invention, 3 to 8% At.
１８〜２８．ｍ：ｉｔ％のＣｒ、残部が実質的にＦｅで
あるＦ ｅ ７ Ｃｒ Ａ！糸金合金火炎センサー用電
極とし、該電極の火炎挿入部を予め酸化募囲気中で加熱
し、その表面に〃２０３の保ｎ皮膜を形成させる手段を
採用する。18-28. m: it% of Cr, the remainder being substantially Fe 7 Cr A! An electrode for a metal thread alloy flame sensor is used, and the flame insertion part of the electrode is heated in advance in an oxidizing atmosphere to form an n-retaining film of 203 on its surface.
（２） 上記手段の作用
前述したＡ４０．からなる保護皮膜は、高温還元性火炎
雰囲中でも浸炭現象を防止し、高温耐蝕、特性を向上さ
せると共に、通電特性を損なうことはない。ここで、Ｆ
ｅ −Ｃｒ−〃系合金に含まれる友が３重量％以下、Ｃ
ｒ が１８重量％以下では、高温耐蝕性が充分でなく、
又、〃が８重量％以上、Ｃｒか２ｓ、！ｔ％以上となる
とその加工性が悪化する。(2) Effect of the above means A40 mentioned above. The protective film made of the above prevents carburization even in a high-temperature reducing flame atmosphere, improves high-temperature corrosion resistance and properties, and does not impair current carrying properties. Here, F
e -Cr- type alloy contains less than 3% by weight, C
When r is less than 18% by weight, high temperature corrosion resistance is insufficient.
Also, 〃 is 8% by weight or more, Cr or 2s,! When it exceeds t%, the processability deteriorates.
（３）実施例
第１図は火炎センサー１０例を示す。ガスや石油バーナ
ー２０火炎３中に金属電極４を挿入し、たとえば１００
〜２００ポルトの電圧を印加し、１２〜２４ミリボルト
の電圧を検出することで、火炎を検出する。(3) Examples FIG. 1 shows ten examples of flame sensors. A metal electrode 4 is inserted into the flame 3 of a gas or oil burner 20, for example 100
Flame is detected by applying a voltage of ~200 volts and detecting a voltage of 12-24 millivolts.
このような火炎センサー１用の金属電極４として、Ｆ’
ｅ −Ｃｙ −７４１系合金材を用い、該電極４を、大
気中で、ＦＪ１０００℃で、２０時間加熱し、その表面
に、Ａｔ２０３の保護皮膜を、約５〜１００μの厚みに
形成する。As the metal electrode 4 for such a flame sensor 1, F'
Using an e-Cy-741 alloy material, the electrode 4 is heated in the atmosphere at FJ 1000° C. for 20 hours to form a protective film of At203 on its surface to a thickness of about 5 to 100 μm.
前述した保護皮膜を有する本発明による電極を試料１お
よび２とし、ｎｉｌ ；ホした保護皮膜を有しない従来
の電極を試料３および４とする。試料１〜４の成分は以
下の通りであ７．）。Samples 1 and 2 are electrodes according to the present invention having the above-mentioned protective coating, and Samples 3 and 4 are conventional electrodes having no protective coating. The components of samples 1 to 4 are as follows7. ).
前記試料１〜４を、２．３ ｗ＋ｌφ×１００−の試材
とし、先端部の約７０謳を火炎中に挿入し、酸化減量を
測定する実用試験と、酸化増量を測定する基礎試験をな
した。実用試験は、火炎温度１３００℃の石油バーナー
を用い５００時間加熱の条件で成し、又、基礎試験は、
大気中１２００℃で２０時間加熱の条件で成した。その
結果を第２図に示す。Samples 1 to 4 were used as specimens of 2.3 w + lφ x 100 -, and about 70 pieces of the tip were inserted into a flame, and a practical test to measure the oxidation weight loss and a basic test to measure the oxidation weight gain were conducted. did. Practical tests were conducted using an oil burner with a flame temperature of 1300°C under heating conditions for 500 hours, and basic tests were conducted under the following conditions:
It was made under the conditions of heating at 1200° C. for 20 hours in the air. The results are shown in FIG.
第２図から明らかなように、火炎中においても試料１と
２とが最つども優れた耐蝕特性を示し、試料３と４とは
、腐蝕量が試料１と２に比べ約３倍にも達することが分
る。尚、石油バーナーやガスバーナーは、その燃焼ガス
と空気の調節とによって還元雰囲気部分が存在する。As is clear from Figure 2, Samples 1 and 2 exhibit the most excellent corrosion resistance even in flames, and Samples 3 and 4 exhibit approximately three times the amount of corrosion compared to Samples 1 and 2. I know I can reach it. Note that in oil burners and gas burners, a reducing atmosphere exists due to the adjustment of combustion gas and air.
さらに、試料１〜４を用いた印加電圧と検出電圧との関
係を強火炎（１２００℃）と物火炎（１０００℃）の条
件下で測定した。該テストは石油バーナーを用い、試片
の寸法および火炎への電極挿入量は前回と同じである。Furthermore, the relationship between the applied voltage and the detected voltage using Samples 1 to 4 was measured under the conditions of strong flame (1200°C) and material flame (1000°C). The test used an oil burner, and the dimensions of the specimen and the amount of electrode insertion into the flame were the same as before.
その結果を第３図に示す。同図から明らかなように、Ａ
ｌ２Ｏφ・らなる保護皮膜が存在しても、検出電圧にほ
とんど影響を与えない。The results are shown in FIG. As is clear from the figure, A
Even if a protective film of l2Oφ is present, it has little effect on the detection voltage.
なお本発明の火炎センサー用金属電極に用いられるＦｅ
−Ｃｒ−Ａｔ系合金は、Ｆｅ、Ｃｒ。Note that Fe used in the metal electrode for the flame sensor of the present invention
-Cr-At alloys include Fe and Cr.
〃を主要構成成分とするが、これら主成分以外に通常台
まれる若干量の微量元素や不純物あるいは特性改良成分
として、Ｚｒ、ｎ。〃 are the main constituents, but in addition to these main constituents, Zr, n.
Ｎｂ等希土類元素を少量含んでも差支えない。There is no problem even if a small amount of rare earth elements such as Nb are included.
第１図は火炎検出装置を示す図、第２図は酸化減量と増
量を示すグラフ図、および第３図は印加電圧と検出電圧
との関係を示すグラフ図である。
図中：２・・・バーナー、３・・・火炎、４・・・金属
電極。
代理人 弁理士 桑 原 英 明FIG. 1 is a diagram showing a flame detection device, FIG. 2 is a graph diagram showing oxidation weight loss and weight gain, and FIG. 3 is a graph diagram showing the relationship between applied voltage and detected voltage. In the figure: 2...Burner, 3...Flame, 4...Metal electrode. Agent Patent Attorney Hideaki Kuwahara
Claims (1)
質的にＦｅ であるＦｅ−Ｃｒ−Ａｔ系金属からなり、
その火炎挿入部を予め酸化雰囲気中で加熱し表面に、４
４０３の保護皮膜を形成させたことを特徴とする火炎セ
ンサー用金属電極。3 to 8% by weight of Cr, 18 to 28% by weight of Cr, and the balance substantially Fe-Cr-At based metal,
The flame insertion part is heated in advance in an oxidizing atmosphere and the surface is exposed to 4
A metal electrode for a flame sensor, characterized in that a protective film of No. 403 is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59111975A JPS60253962A (en) | 1984-05-31 | 1984-05-31 | Metallic electrode for flame sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59111975A JPS60253962A (en) | 1984-05-31 | 1984-05-31 | Metallic electrode for flame sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60253962A true JPS60253962A (en) | 1985-12-14 |
Family
ID=14574816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59111975A Pending JPS60253962A (en) | 1984-05-31 | 1984-05-31 | Metallic electrode for flame sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60253962A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001020281A1 (en) * | 1999-09-14 | 2001-03-22 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Sheathed conductor arrangement for use in a corrosive environment and method for producing a sheathed conductor arrangement |
| US20090200564A1 (en) * | 2004-06-02 | 2009-08-13 | Semiconductor Manufacturing International (Shanghai) Corporation | Method and Structure for Fabricating Smooth Mirrors for Liquid Crystal on Silicon Devices |
| KR20190007402A (en) * | 2017-07-12 | 2019-01-22 | 린나이코리아 주식회사 | Flame rod |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5952747A (en) * | 1982-09-20 | 1984-03-27 | Hitachi Metals Ltd | Flame current detecting sensor |
-
1984
- 1984-05-31 JP JP59111975A patent/JPS60253962A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5952747A (en) * | 1982-09-20 | 1984-03-27 | Hitachi Metals Ltd | Flame current detecting sensor |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001020281A1 (en) * | 1999-09-14 | 2001-03-22 | Emitec Gesellschaft Für Emissionstechnologie Mbh | Sheathed conductor arrangement for use in a corrosive environment and method for producing a sheathed conductor arrangement |
| US20090200564A1 (en) * | 2004-06-02 | 2009-08-13 | Semiconductor Manufacturing International (Shanghai) Corporation | Method and Structure for Fabricating Smooth Mirrors for Liquid Crystal on Silicon Devices |
| US9310643B2 (en) * | 2004-06-02 | 2016-04-12 | Semiconductor Manufacturing International (Shanghai) Corporation | Method and structure for fabricating smooth mirrors for liquid crystal on silicon devices |
| KR20190007402A (en) * | 2017-07-12 | 2019-01-22 | 린나이코리아 주식회사 | Flame rod |
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