JPH0443710Y2 - - Google Patents
Info
- Publication number
- JPH0443710Y2 JPH0443710Y2 JP1986015449U JP1544986U JPH0443710Y2 JP H0443710 Y2 JPH0443710 Y2 JP H0443710Y2 JP 1986015449 U JP1986015449 U JP 1986015449U JP 1544986 U JP1544986 U JP 1544986U JP H0443710 Y2 JPH0443710 Y2 JP H0443710Y2
- Authority
- JP
- Japan
- Prior art keywords
- detection rod
- flame detection
- flame
- ceramic
- rod
- 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
- 238000001514 detection method Methods 0.000 claims description 35
- 239000000919 ceramic Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 7
- 239000003921 oil Substances 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000012212 insulator Substances 0.000 description 3
- 229910000640 Fe alloy Inorganic materials 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000011195 cermet Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000003870 refractory metal Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Control Of Combustion (AREA)
Description
【考案の詳細な説明】
〈産業上の利用分野〉
この考案はガスバーナやオイルバーナに設置さ
れ、その先端が燃焼室内の保炎板の内部周壁に沿
つて挿入されている火炎検知ロツドに係り、特に
性能面においてすぐれた火炎検知ロツドに関する
ものである。[Detailed description of the invention] <Industrial application field> This invention relates to a flame detection rod that is installed in a gas burner or oil burner, and whose tip is inserted along the inner circumferential wall of a flame-holding plate inside the combustion chamber. In particular, it relates to a flame detection rod that is excellent in terms of performance.
〈従来の技術とその問題点〉
ガスバーナやオイルバーナの火炎の消火をすみ
やかに検出するために、火炎検知ロツドが設置さ
れていて、ガスバーナやオイルバーナにおける火
炎が異常なく点火しているかどうかを検知する役
目を果している。<Conventional technology and its problems> In order to quickly detect whether the flame in a gas burner or oil burner is extinguished, a flame detection rod is installed to detect whether the flame in the gas burner or oil burner is ignited without abnormality. It is fulfilling its role.
しかして、この火炎検知ロツドの材質として
は、これまでステンレス（SUS）やFe−Ni−Cr
−Ａの如きFe合金よりなる電熱線が用いられ
ている。 However, the materials used for this flame detection rod have so far been stainless steel (SUS) and Fe-Ni-Cr.
A heating wire made of an Fe alloy such as -A is used.
ところが、これらの火炎検知ロツドでは高温部
では熱によりやせてしまい折れてしまう、耐久性
が悪い、などの欠点があり、該ロツドの点検が常
時必要であつたりして安全性と信頼性の点から問
題があつた。 However, these flame detection rods have drawbacks such as being thinned and broken in high-temperature areas, poor durability, and requiring constant inspection of the rods, which poses a problem in terms of safety and reliability. There was a problem.
そこで、他の従来例として、特公昭41−13313
号に示すように、燃焼する焔中に差し込まれる耐
熱金属又は導電性セラミツク或はサーメツト若し
くはこれらの複合体より成る１個又は１個以上の
検知電極を用いたものが知られている。 Therefore, as another conventional example,
It is known to use one or more sensing electrodes made of refractory metal or conductive ceramic or cermet, or a composite thereof, which are inserted into the burning flame, as shown in No.
ところが、この従来例では、ZrO2−Y2O3系の
導電性セラミツク検知電極であり、このような導
電性セラミツク検知電極では導電率は小さい。し
かも、放電加工性の点でも問題がある。 However, this conventional example uses a ZrO 2 --Y 2 O 3 based conductive ceramic sensing electrode, and such a conductive ceramic sensing electrode has low conductivity. Moreover, there is also a problem in electrical discharge machinability.
この考案は、上記従来の課題を解決するために
なされたもので、ZrO2−Y2O3系セラミツクより
も導電率を10桁以上大きくして、火炎検知性能を
高め、しかも放電加工性に優れた高信頼性の火炎
検知ロツドを提供することを目的とする。 This idea was made to solve the above-mentioned conventional problems, and has a conductivity that is more than 10 orders of magnitude higher than that of ZrO 2 -Y 2 O 3 ceramics, which improves flame detection performance and improves electrical discharge machinability. The purpose is to provide an excellent and highly reliable flame detection rod.
〈課題を解決するための手段〉
本考案者らは上記に鑑みて良電導性を有し、し
かも耐熱性があつて高温部での耐久性を備えてい
て、やせたり折れたりすることのない寿命の長い
火炎検知ロツドを得るべく、その材質について検
討の結果、良電導性を有するセラミツクを用いて
製造した火炎検知ロツドであれば、上記の特性が
得られることを見出したのである。<Means for solving the problem> In view of the above, the inventors of the present invention have developed a product that has good conductivity, is heat resistant, has durability in high temperature areas, and does not thin or break. In order to obtain a flame detection rod with a long life, we investigated the materials and found that the above characteristics can be obtained if the flame detection rod is manufactured using ceramics that have good electrical conductivity.
即ち、この考案は、ガスまたはオイルバーナの
火炎の消火を速やかに検出するための火炎検知ロ
ツドであつて、その材質が電気伝導度1S・cm-1以
上であるSi3N4を主成分とした良電導性セラミツ
クからなる火炎検知ロツドである。 That is, this invention is a flame detection rod for quickly detecting the extinguishment of a gas or oil burner flame, and the material is mainly composed of Si 3 N 4 having an electrical conductivity of 1S cm -1 or higher. This is a flame detection rod made of highly conductive ceramic.
〈作用〉
この考案によれば、火炎検知ロツドは電気伝導
度が1S・cm-1以上のSi3N4を主成分とした良電導
性セラミツクで構成されているから、従来の
ZrO2−Y2O3系よりも放電加工性がよく、さらに
導電率を10桁以上大きくできるので、火炎検知性
能が向上し、燃焼の安全が保たれる。<Function> According to this invention, the flame detection rod is made of a highly conductive ceramic mainly composed of Si 3 N 4 with an electrical conductivity of 1S cm -1 or more, so it is different from the conventional one.
It has better electrical discharge machinability than the ZrO 2 −Y 2 O 3 series, and can increase conductivity by more than 10 orders of magnitude, improving flame detection performance and maintaining combustion safety.
〈実施例〉
以下、この考案をその一実施例を示す図面にも
とづいて説明する。<Example> Hereinafter, this invention will be explained based on drawings showing one example of the invention.
第１図がこの考案に係る火炎検知ロツドＡであ
つて、１が良電導性セラミツクよりなる検知棒、
２は絶縁碍子、３は高圧端子である。 FIG. 1 shows a flame detection rod A according to this invention, in which 1 is a detection rod made of a highly conductive ceramic;
2 is an insulator, and 3 is a high voltage terminal.
しかして、このセラミツクよりなる検知棒１と
高圧端子３は絶縁碍子２を被せた部分で両者を接
続してあるが、セラミツク検知棒１の働きは保炎
板の内部周壁に沿つて挿入されている部分にある
ので、この良電導性セラミツツクが高価である点
を考慮すると、出来るだけ短くすることが好まし
い。 The detection rod 1 made of ceramic and the high-voltage terminal 3 are connected by the part covered with the insulator 2, but the function of the ceramic detection rod 1 is to insert it along the inner circumferential wall of the flame-holding plate. Considering that this highly conductive ceramic is expensive, it is preferable to make it as short as possible.
第２図はこの火炎検知ロツドＡのセラミツク検
知棒１を燃焼筒４内でメインガス噴出管５の先端
に取付けた複数の２次空気噴出口７を有する保炎
板６に挿入した状態を示すものであり、８はパイ
ロツトガス供給パイプである。 FIG. 2 shows a state in which the ceramic detection rod 1 of this flame detection rod A is inserted into a flame holding plate 6 having a plurality of secondary air injection ports 7 attached to the tip of the main gas injection pipe 5 in the combustion tube 4. 8 is a pilot gas supply pipe.
また、この火炎検知ロツドＡは第３図に示すよ
うに、パイロツトガス供給パイプ８に対して、そ
の対向する側に設置した点火ロツドＢとともに用
いられる。 Further, as shown in FIG. 3, this flame detection rod A is used together with an ignition rod B installed on the opposite side of the pilot gas supply pipe 8.
このような良電導性セラミツク製検知ロツドを
有する火炎検知ロツドであれば、従来の材質とし
て使われてきたSUSやFe合金に比べて高温部で
の耐久性もあり、従つてやせたり、折れたりとい
う事故は全くその心配がなく、点検も常時必要と
せず、寿命が半永久であるなど安全性と信頼性に
大きな特徴を有するのである。 Flame detection rods with detection rods made of such highly conductive ceramics are more durable in high-temperature areas than conventional materials such as SUS and Fe alloys, and are therefore less prone to thinning or breaking. There is no need to worry about such accidents, constant inspections are not required, and the product has a semi-permanent lifespan, making it extremely safe and reliable.
かくして第２図および第３図に示すようなガス
またはオイル用バーナにおいて、この考案の良電
導性を有するセラミツクからなる火炎検知ロツド
を用いるだけでも前述した特徴が得られるのであ
るが、これに加えて、点火ロツドや保炎板をも良
電導性を有するセラミツク製とするならば、その
効果をさらに相乗的とすることができる。 Thus, in gas or oil burners as shown in Figs. 2 and 3, the above-mentioned features can be obtained simply by using the flame detection rod made of ceramic with good electrical conductivity of this invention. If the ignition rod and flame holding plate are also made of ceramic having good electrical conductivity, the effect can be made even more synergistic.
この考案において、火炎検知ロツドの材質とし
て使用する良電導性のセラミツクとは、平均粒径
2μm以下のSi3N4粒子と少なくとも一部が互いに
連結したTiNまたは／およびTiC粉末からなる電
気伝導度が1S・cm-1以上であるセラミツクであ
る。そしてこのようなセラミツクの製造法の１例
を挙げると、Si3N4粉末に導電性付与剤として
TiNまたは／およびTiC粉末を15〜40体積％、焼
結助剤としてMgOまたは／およびＡ2O3粉末を
0.01〜3.0体積％添加し、非酸化雰囲気中、加圧
下で1600〜2000℃で焼結することにより得られる
ものであり、このセラミツクは良電導性とともに
放電加工性にもすぐれているのでこの考案のよう
な形状への加工も簡単に行なうことができるので
ある。 In this invention, the ceramic with good conductivity used as the material of the flame detection rod has an average particle size of
It is a ceramic having an electrical conductivity of 1S·cm -1 or more, which is made of Si 3 N 4 particles of 2 μm or less and TiN or/and TiC powders at least partially connected to each other. One example of a method for producing ceramics is to use Si 3 N 4 powder as a conductivity imparting agent.
15-40% by volume of TiN or/and TiC powder, MgO or/and A2O3 powder as sintering aid .
It is obtained by adding 0.01 to 3.0% by volume and sintering at 1600 to 2000℃ under pressure in a non-oxidizing atmosphere.This ceramic has good electrical conductivity and excellent electrical discharge machinability, so this idea was developed. It can also be easily processed into shapes like this.
このような良電導性セラミツクよりなる火炎検
知ロツドはガス湯沸器、ガス風呂などのガスバー
ナのみならず、重油、軽油、灯油などを燃料とす
るボイラやフアーネスなどのオイル用バーナにお
ける火炎検知ロツドとしても有用であり、重油や
軽油中の不純物であるＳの影響を全く受けないも
のである。 Flame detection rods made of such highly conductive ceramics can be used not only for gas burners such as gas water heaters and gas baths, but also for oil burners such as boilers and furnaces that use heavy oil, light oil, kerosene, etc. as fuel. It is also useful and is completely unaffected by S, which is an impurity in heavy oil and light oil.
なお、この考案に係る火炎検知ロツドの形状は
第１図に示すものがその１例であつて、これに何
ら限定されるものではない。 Incidentally, the shape of the flame detection rod according to this invention is shown in FIG. 1 as an example, and is not limited to this in any way.
〈考案の効果〉
以上説明したように、この考案によれば、火炎
検知ロツドの材質として電気伝導度1S・cm-1の
Si3N4を主成分とした良電導性セラミツクを用い
たから、従来のZrO2−Y2O3系セラミツクよりも
導電率を10桁以上大きくでき、火炎検知性能が向
上すると共に、放電加工性にも優れる結果、長寿
命化を実現して高信頼の検知ロツドが得られると
いう格別の効果を奏する。<Effects of the invention> As explained above, according to this invention, the material for the flame detection rod has an electrical conductivity of 1S cm -1 .
Since we use a highly conductive ceramic mainly composed of Si 3 N 4 , we can increase the electrical conductivity by more than 10 orders of magnitude compared to conventional ZrO 2 -Y 2 O 3 ceramics, improve flame detection performance, and improve electrical discharge machinability. As a result, it has the exceptional effect of achieving a long life and providing a highly reliable detection rod.
第１図は、この考案になるセラミツク製火炎検
知ロツドの斜視図、第２図は燃焼筒内におけるこ
の考案のセラミツク製火炎検知ロツドの配置を示
す説明図、第３図は同じく点火ロツドとこの考案
のセラミツク製火炎検知ロツドとの関係を示す一
部切欠説明図である。
Ａ……火炎検知ロツド、Ｂ……点火ロツド、１
……良電導性セラミツクよりなる検知棒、２……
絶縁碍子、３……高圧端子、４……燃焼室、５…
…メインガス噴出管、６……保炎板、７……２次
空気噴出口、８……パイロツトガス供給パイプ。
Fig. 1 is a perspective view of the ceramic flame detection rod of this invention, Fig. 2 is an explanatory diagram showing the arrangement of the ceramic flame detection rod of this invention in the combustion cylinder, and Fig. 3 is the same as the ignition rod. It is a partially cutaway explanatory diagram showing the relationship with the invented ceramic flame detection rod. A...Flame detection rod, B...Ignition rod, 1
...Detection rod made of highly conductive ceramic, 2...
Insulator, 3... High voltage terminal, 4... Combustion chamber, 5...
...Main gas blowout pipe, 6...Flame holding plate, 7...Secondary air blowout port, 8...Pilot gas supply pipe.
Claims (1)
ドであつて、その材質が電気伝導度1S・cm-1以上
であるSi3N4を主成分とした良導電性セラミツク
からなることを特徴とする火炎検知ロツド。 A flame detection rod used in a gas or oil burner, characterized in that the material is made of highly conductive ceramic mainly composed of Si 3 N 4 with an electrical conductivity of 1S cm -1 or higher. Rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986015449U JPH0443710Y2 (en) | 1986-02-05 | 1986-02-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986015449U JPH0443710Y2 (en) | 1986-02-05 | 1986-02-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62131250U JPS62131250U (en) | 1987-08-19 |
| JPH0443710Y2 true JPH0443710Y2 (en) | 1992-10-15 |
Family
ID=30806395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986015449U Expired JPH0443710Y2 (en) | 1986-02-05 | 1986-02-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0443710Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59101702A (en) * | 1982-11-30 | 1984-06-12 | 株式会社日立製作所 | Ceramic conductive material and electric device using same |
| JPS60138324A (en) * | 1983-12-26 | 1985-07-23 | Hitachi Heating Appliance Co Ltd | Flame rod |
-
1986
- 1986-02-05 JP JP1986015449U patent/JPH0443710Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59101702A (en) * | 1982-11-30 | 1984-06-12 | 株式会社日立製作所 | Ceramic conductive material and electric device using same |
| JPS60138324A (en) * | 1983-12-26 | 1985-07-23 | Hitachi Heating Appliance Co Ltd | Flame rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62131250U (en) | 1987-08-19 |
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