JPH0269627A - Protective tube for thermocouple - Google Patents
Protective tube for thermocoupleInfo
- Publication number
- JPH0269627A JPH0269627A JP22276888A JP22276888A JPH0269627A JP H0269627 A JPH0269627 A JP H0269627A JP 22276888 A JP22276888 A JP 22276888A JP 22276888 A JP22276888 A JP 22276888A JP H0269627 A JPH0269627 A JP H0269627A
- Authority
- JP
- Japan
- Prior art keywords
- refractory
- layer
- thermocouple
- protective tube
- refractories
- 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
- 230000001681 protective effect Effects 0.000 title claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000002184 metal Substances 0.000 abstract description 18
- 239000011819 refractory material Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 8
- 230000035939 shock Effects 0.000 abstract description 5
- 239000002893 slag Substances 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract 2
- 230000002093 peripheral effect Effects 0.000 abstract 1
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 6
- 230000003628 erosive effect Effects 0.000 description 5
- 229910052863 mullite Inorganic materials 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 229910052845 zircon Inorganic materials 0.000 description 5
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 230000009970 fire resistant effect Effects 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000008119 colloidal silica Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- LIXXICXIKUPJBX-UHFFFAOYSA-N [Pt].[Rh].[Pt] Chemical compound [Pt].[Rh].[Pt] LIXXICXIKUPJBX-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001179 chromel Inorganic materials 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- -1 light Chemical compound 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は金属溶湯等の高温液体を熱電対で測温する際に
用いる熱電対保護管に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermocouple protection tube used when measuring the temperature of a high-temperature liquid such as molten metal with a thermocouple.
［従来の技術］
金属溶湯等の高温液体あるいはその他の高温ガスの温度
測定には白金−白金ロジウムまたはアルメル−クロメル
等の熱電対が広く使用されている。[Prior Art] Thermocouples such as platinum-platinum rhodium or alumel-chromel are widely used to measure the temperature of high-temperature liquids such as molten metals or other high-temperature gases.
これら熱電対は測温に際して接点を測温対象と同一温度
に保つため、接点を高温液体に浸漬しなり高温ガスにさ
らしたりする必要がある。しかし、これら熱電対の素線
を裸のまま測温対象に接触させるときは、溶湯やスラグ
によって酸化、浸食あるいは汚染を受けるので、物理的
あるいは化学的に劣イヒが激しく、極めて短寿命となる
。そのため、熱電対の接点部分は通常保護管に収容して
使用する。In order to maintain the contacts of these thermocouples at the same temperature as the object to be measured when measuring temperature, the contacts must be immersed in high-temperature liquid or exposed to high-temperature gas. However, when the bare wires of these thermocouples are brought into contact with the object to be measured, they are subject to oxidation, erosion, and contamination by molten metal and slag, resulting in severe physical and chemical deterioration and an extremely short lifespan. . Therefore, the contact portion of the thermocouple is usually housed in a protection tube.
熱電対用の保護管としては金属管を使用することも多い
が、特に測温対象が鉄系やニッケル系などの高温の金属
溶湯の場合には、金属製の保護管では耐熱性が不足する
ので、非金属製の保護管が使用される。Metal tubes are often used as protection tubes for thermocouples, but metal protection tubes lack heat resistance, especially when the temperature to be measured is high-temperature molten metal such as iron or nickel. Therefore, non-metallic protection tubes are used.
［発明が解決しようとする課題］
鉄系金属溶湯あるいはニッケル系金属溶湯などの高温の
金属溶湯の温度測定を連続して実施したい場合、最高使
用温度の高いジルコニア質あるいは再結晶質アルミナな
どの保護管を用いる必要がある。しかし、これらの保護
管を用いる場合、使用に先立って十分に予熱しておかな
ければ、溶湯に浸漬する際のヒートショックにより保護
管に割れが生じたり、また保護管を金属溶湯から取り出
した際の保護管周囲に付着した滓の冷却による収縮応力
によって割れたりして、保護管の再利用が困難になると
いう欠点があった。[Problem to be solved by the invention] When it is desired to continuously measure the temperature of high-temperature molten metal such as iron-based molten metal or nickel-based molten metal, it is necessary to protect zirconia or recrystallized alumina, etc., which have a high maximum operating temperature. It is necessary to use a tube. However, when using these protective tubes, if they are not sufficiently preheated before use, they may crack due to heat shock when immersed in molten metal, or cracks may occur when the protective tube is removed from molten metal. The drawback was that the shrinkage stress caused by the cooling of the slag adhering to the periphery of the protective tube could cause it to crack, making it difficult to reuse the protective tube.
前記の問題点を解決する方法として、保護管の表面に耐
火物層を形成するものがある。すなわち、再結晶アルミ
ナやムライト等のセラミックからなる筒状体の外周上に
ＩＩ Ｋｍな耐大物粉末のスラリーと、大径耐火物粒子
とを交互に複数回にわたって１寸着させた耐火物層を形
成した熱電対用保護管である。One method for solving the above problems is to form a refractory layer on the surface of the protective tube. That is, on the outer periphery of a cylindrical body made of ceramic such as recrystallized alumina or mullite, a refractory layer is formed by depositing a slurry of II Km large-sized powder and large-diameter refractory particles alternately several times. This is a thermocouple protection tube.
しかしながらに、表面に耐火物層を形成したこの前記の
提案（以下コーティング保護管という）においても、以
下のような幾つかの問題点がある。However, even in the above-mentioned proposal in which a refractory layer is formed on the surface (hereinafter referred to as coated protection tube), there are several problems as described below.
ａ）保護管外周に付着させるＶ＆細耐火物粒子および大
径耐火物粒子の材質がジルコンあるいはムライトのよう
に耐火度があまり高くないものを用いる場き、予め８０
０℃以上でコーティング保護管を焼成して、大小の耐火
物の結合を強くさせるか、あるいは溶湯浸漬直前にコー
ティング保護管を５００℃以上に予熱しておく必要があ
り、操業コストの増大を招来している。a) If the material of the V&fine refractory particles and large-diameter refractory particles to be attached to the outer periphery of the protection tube is not very high in fire resistance, such as zircon or mullite, 80%
It is necessary to bake the coated protective tube at 0°C or higher to strengthen the bonds between large and small refractories, or to preheat the coated protective tube to 500°C or higher just before immersion in the molten metal, which increases operating costs. are doing.
ｂ） ａ）で用いたジルコンあるいはムライトよりも
耐火度の高いジルコニアのような耐火物を用いると、α
）で述べたような焼成あるいは予熱は必要が無いが、ジ
ルコニアを用いると他の低級耐火物に比べてコストが高
い。b) If a refractory such as zirconia, which has a higher refractoriness than the zircon or mullite used in a), is used, α
Although there is no need for firing or preheating as described in ), the cost of using zirconia is higher than that of other low-grade refractories.
Ｃ）たとえ、耐火度の高い耐火物を用いる場なでも、耐
火物の付着回数（層数）をかなり多くしなければならず
、時間的にも材料コスト的にち不利である。C) Even if a refractory with a high degree of fire resistance is used, the number of times the refractory is applied (the number of layers) must be increased considerably, which is disadvantageous in terms of time and material cost.
本発明は、従来のコーティング保護管の前記のごとき問
題点に鑑みてなされたものであって、低級な耐火物でし
かも付着層数を滅らした耐火物層で、従来のコーティン
グ保護管よりも浸れた耐久力を持った熱電対用保護管を
提供することを目的とする。The present invention has been made in view of the above-mentioned problems of conventional coated protective tubes, and uses a refractory layer that is made of low-grade refractory material and has a reduced number of adhesion layers, and is better than conventional coated protective tubes. The purpose of the present invention is to provide a protective tube for thermocouples with excellent durability.
［課題を解決するための手段］
本発明の熱電対用保護管は、先端が密閉され内部に熱電
対が挿入できる筒状体と、前記筒状体の外周に巻きｆす
けられた耐火性繊維からなる繊維層と、微細な耐火物粉
末層と大粒の耐火物粒子層を交互に積層してなり前記繊
維層の表面に形成された耐火物層とからなることを要旨
とする。[Means for Solving the Problems] The thermocouple protection tube of the present invention includes a cylindrical body whose tip is sealed and into which a thermocouple can be inserted, and a fire-resistant fiber wrapped around the outer periphery of the cylindrical body. and a refractory layer formed on the surface of the fiber layer by alternately laminating fine refractory powder layers and large refractory particle layers.
先端が密閉され内部に熱電対が挿入できる筒状体は、従
来から保護管材料として使用されている再結晶アルミナ
やムライト等のセラミックスが使用される。筒状体の外
周に巻き付けられる耐火性繊維は１０００℃以上の温度
に堪え得る耐火性のセラミックｍ維からなるものであれ
ば何でも良い。The cylindrical body whose tip is sealed and into which a thermocouple can be inserted is made of ceramics such as recrystallized alumina or mullite, which have been conventionally used as protective tube materials. The refractory fibers wound around the outer periphery of the cylindrical body may be of any type as long as they are made of refractory ceramic fibers that can withstand temperatures of 1000° C. or higher.
また耐火性繊維の形状は繊維のままのものでも良く、あ
るいはシート状としたもの、リボン状としたものでも良
く、要は筒状体の外周に巻き付けてｍ離層を形成できる
ものであれば良い。In addition, the shape of the refractory fiber may be in the form of a fiber, or may be in the form of a sheet or ribbon, as long as it can be wrapped around the outer periphery of a cylindrical body to form a delamination layer. good.
耐火物層を形成する微細な耐火物粉末と大径耐火物粒子
としては、いずれもジルコン、ハイアルミナ、ムライト
、ジルコニアのうちから選ばれた１種または２種以上を
用いることが望ましい。微細耐火物粉末は５０〜５００
メツシユの範囲内の粒度とし、コロイダルシリカあるい
はエチルシリゲート加水分解液をバインダーとしてスラ
リー状にする。この微細耐火物粉末のスラリーと、０１
〜２＋６１鞠の範囲内の粒径の大径耐火物粒子とを繊維
層の上に交互に複数層にわたって１寸着させる。As the fine refractory powder and large-diameter refractory particles forming the refractory layer, it is desirable to use one or more selected from zircon, high alumina, mullite, and zirconia. Fine refractory powder is 50-500
The particle size is within the range of mesh, and the slurry is made using colloidal silica or ethyl silicate hydrolyzate as a binder. This slurry of fine refractory powder and 01
Large-diameter refractory particles having a particle size in the range of ~2+61 mm are alternately deposited on the fiber layer in multiple layers.
形成された耐火物層は６００°Ｃ以上の温度で焼成する
ことが望ましい３
［作用コ
筒状体の外周に巻き付けられたｈＭＩ維層離層筒状体お
よび外周の微細耐火物粉末および大径耐火物粒子からな
る耐火物層に比べて柔斂性があるので、ヒートショック
や滓の付着による収縮応力に対するクツション材として
作用し、耐久力が増加する。It is desirable that the formed refractory layer be fired at a temperature of 600°C or higher. Since it is more flexible than a refractory layer made of refractory particles, it acts as a cushioning material against shrinkage stress due to heat shock and adhesion of slag, increasing durability.
また、繊維層自体が耐火性を有するので、耐火物層の積
層数を減少させることが可能となる。Moreover, since the fiber layer itself has fire resistance, it is possible to reduce the number of laminated refractory layers.
［実施例］
本発明の好適な実施例について以下図面に基づいて説明
する。[Example] A preferred example of the present invention will be described below based on the drawings.
第１図は本発明の一実施例の縦断面図、第２図は第１図
の実施例の横断面図、第３図は第１図の部分拡大図であ
る。筒状体１は外径１３ｍ＋ｎ、内径９Ｉｎｍ、長さ５
００＋ｕｎの先端が密封された管であり、再溶融アルミ
ナ質からなる。筒状体］の外周には耐火性繊維を素材と
するシート（イソライトベブコック製カオウールエース
ペーパ、２ 、５ ＋ｎ＋ｎｌ！ ）カ繊離層６として
１回巻きけけられている。1 is a longitudinal cross-sectional view of one embodiment of the present invention, FIG. 2 is a cross-sectional view of the embodiment of FIG. 1, and FIG. 3 is a partially enlarged view of FIG. 1. Cylindrical body 1 has an outer diameter of 13 m+n, an inner diameter of 9 Inm, and a length of 5
It is a tube with a sealed tip and is made of remelted alumina. A sheet made of fire-resistant fiber (Kao Wool Ace Paper manufactured by Isolite Bevcock, 2,5+n+nl!) is wrapped once around the outer periphery of the cylindrical body as a separation layer 6.
耐火物層３を構成する微細耐火物粒子４はジルコン、ハ
イアルミナサンド、ノ、ライト、ジルコニアのうちから
ｉｌｌ！ばれた１種の粒度２００〜４００メツシユの粉
末である。また、耐火物層３を構成する大径耐火物粒子
５はジルコン、ハイアルミナサンド、ノ、ライト、ジル
コニアのうちから選ばれた１種の粒径０．３〜１．５ｍ
ｍの粒子である。The fine refractory particles 4 constituting the refractory layer 3 are selected from among zircon, high alumina sand, light, and zirconia. It is a powder with a particle size of 200 to 400 mesh. Further, the large-diameter refractory particles 5 constituting the refractory layer 3 are selected from zircon, high alumina sand, porcelain, and zirconia, and have a particle size of 0.3 to 1.5 m.
m particles.
微細耐火物粒子４は１０％Ｓ ｉ Ｏ２濃度のコロイダ
ルシリカをバインダとしてスラリー状とし、この微細耐
火物粒子４からなるスラリーと大径耐火物粒子５とを繊
維層６の上に交互に４層もしくは６層付着して耐火物層
３が形成されている。The fine refractory particles 4 are made into a slurry using colloidal silica with a 10% SiO2 concentration as a binder, and the slurry consisting of the fine refractory particles 4 and large-diameter refractory particles 5 are alternately placed on the fiber layer 6 in four layers. Alternatively, the refractory layer 3 is formed by depositing six layers.
このようにして筒状体１の上に繊維層６および耐火物層
３の形成された保護管は、一部のものについては９００
℃で１時間焼成する処理を施した。Some of the protective tubes in which the fiber layer 6 and the refractory layer 3 are formed on the cylindrical body 1 have a diameter of 900 mm.
It was subjected to baking treatment at ℃ for 1 hour.
なお、比較のためにもＣ来のコーティング保護管を作成
した。第４図は従来のコーティング保護管の縦断面図、
第５ＵＡは第４１１Ａの作表管の横断面図、第６Ｉ７１
は第、１図の部分拡大断面図である。第４［２１〜第６
ｒ３から明らかなように、比Ｉ咬例のコーティング保
護管は繊維層６を形成しない以外は本発明方法と同じ方
法で作成され、一部のものについては焼成３施した。For comparison, a coated protection tube was also prepared. Figure 4 is a longitudinal cross-sectional view of a conventional coated protective tube.
5UA is a cross-sectional view of the 411A tabulation tube, 6I71
FIG. 1 is a partially enlarged sectional view of FIG. 4th [21st to 6th
As is clear from r3, the coated protective tube of the ratio I bite was produced by the same method as the method of the present invention except that the fiber layer 6 was not formed, and some of the tubes were subjected to firing 3 times.
以上のようにして作成した本発明例の保護管と、比較例
のＩＸ 護管について、次のようにして耐溶湯溶損性（
耐侵食性）および耐熱１Ｒ撃性を試験した。Regarding the protective tube of the present invention example prepared as described above and the IX protective tube of the comparative example, the molten metal erosion resistance (
Erosion resistance) and heat 1R impact resistance were tested.
すなわち、ＪＩＳ ５Ｃ３１３相当のステンレス鋳鋼
の１４００〜１４５０℃に保持した溶湯中に各保護管を
２４時間浸漬し、その溶損を調べた。That is, each protective tube was immersed for 24 hours in a molten stainless steel cast steel equivalent to JIS 5C313 maintained at 1400 to 1450°C, and its melt damage was examined.
また、各保護管分子熱なしらしくは５００°Ｃに予熱し
て前記の１４００〜１４５０’Ｃの溶湯中に浸漬した時
の保護管グ）ヒートクラックによる割れの有無を調べた
。さらに、各１’Ｒ３ｆｆ管を１０００℃に予熱後、前
記Ｌ −１００〜１４５０°Ｃに保持した溶湯中に８時
間浸漬し、然る綴溶湯から取り出して放冷後、再度１０
００°Ｃに予熱して前記と同様に溶湯中に８時間浸漬し
、取り出して放冷するというサイクルを繰り返した場合
の、保護管の繰り返し使用可能な回数を調べた。その評
価結果を各保護管のＩＰ成条件とともに本発明例の場合
を第１表に、比較例の場合を第２表に示した。In addition, each protective tube was preheated to 500° C. and immersed in the molten metal at 1400 to 1450° C. The presence or absence of cracks due to heat cracks was examined for each protective tube. Furthermore, after preheating each 1'R3ff tube to 1000°C, it was immersed in the molten metal maintained at L -100 to 1450°C for 8 hours, taken out from the molten metal, left to cool, and then heated again for 100°C.
The number of times the protective tube could be used repeatedly was investigated by repeating the cycle of preheating to 00°C, immersing it in the molten metal for 8 hours as described above, taking it out and letting it cool. The evaluation results are shown in Table 1 for the present invention examples and in Table 2 for the comparative examples, along with the IP formation conditions of each protection tube.
なお、ここで評価方法は、同一条件で作成された保護管
を各計画項目ごとに３本用意し、溶損量は殆ど溶損が認
められなかった場合を○印、再代用不能な程度に溶損が
激しい場合をＸ印、その中間をΔ印で評価した。また、
ヒートクラックによる割れは、３木とも割れが生じなか
った場きを○印、１本または２木に割れが生じた場合を
Δ印、３本命部が割れた渇きをＸ印で評価した。また繰
り返し使用可能な回数は、３木の平均（直とした。The evaluation method here is to prepare three protective tubes for each planning item that were created under the same conditions, and mark the amount of erosion loss as ○ if almost no erosion was observed, and indicate that it cannot be replaced again. The case where the melting loss was severe was evaluated by the mark "X", and the case in between was marked by the mark "Δ". Also,
Regarding cracking due to heat cracking, the marks were ○ if no cracks occurred in any of the three trees, Δ marks if cracks occurred in one or two trees, and X marks if the three favorite parts were cracked. In addition, the number of times that can be used repeatedly is the average of the three trees.
ただし、この繰り遅し試験は５回までしか繰りｊｇさな
かった。However, this repeat test was repeated only up to 5 times.
く 以 下 余 白 ）
第１人および第２ノ七から明らかなように、本発明例の
熱電対ＩＺ護管（Ｎｏ、 ］〜１６）においては、耐
火物層を形成する倣Ｒ■耐火物扮末および大径耐火物粒
子の種類、ＪΔ数、焼成の有無によって差はあるものの
、いずれも繊ｆｌｆ層を形成しなかっｆＳ従宋のコーテ
ィング保護管（Ｎｏ、］、７〜３２）と比較してヒート
ショックによる割れが少なくかつ繰り返し便用可能回数
が多く、保護管の耐久性が著しく改善されていることが
確認された２［発明の効果］
本発明の熱電対保護管は耐熱用撃性や耐ン容湯溶損性が
従来のコーティング（呆護管と比較して格段に改善され
そのため保護管としての耐久性が向上して保護管の耐用
期間、耐用回数が増大するという顕著な効果が得られる
。As is clear from the first person and the second No. 7, in the thermocouple IZ protection tubes (No. 1 to 16) of the examples of the present invention, the patterned R refractories forming the refractory layer are Although there are differences depending on the type of refractory and large-diameter refractory particles, JΔ number, and presence or absence of firing, none of them form a fiber flf layer. It was confirmed that the thermocouple protection tube of the present invention is less likely to crack due to heat shock and can be used repeatedly, and the durability of the protection tube is significantly improved.2 [Effects of the Invention] The thermocouple protection tube of the present invention This is a significant improvement in the durability and corrosion resistance of the protective tube compared to conventional coatings (protective tubes), which improves the durability of the protective tube and increases the service life and number of times the protective tube can be used. Effects can be obtained.
また、この発明による熱電対１′Ａ護管は、耐火性繊維
からなる繊維層を巻き１寸けることにより、繊ｔ、ｌｔ
層がヒートショックや滓のけ着による収縮応力に対する
クツション材として作用するので、耐久力が増加し、筒
状体としては比較的低級な低コストのセラミックスを使
用することが可能であり、また耐火物層を形成する微細
耐火物粉末および大径耐火物粒子も比較的低級で低コス
トの耐火物の使用が可能である。さらには耐火物層を形
成する微細耐火物粉末と大径耐火物粒子の積層回数を減
らすことが可能となり、そのため全体としてのコストも
増大せず、低コストで熱電対保護管を製造することでき
る。In addition, the thermocouple 1'A protection tube according to the present invention can be made by winding a fiber layer made of fire-resistant fiber and cutting it by one inch.
The layer acts as a cushioning material against the shrinkage stress caused by heat shock and slag build-up, increasing durability, allowing the use of relatively low-grade, low-cost ceramics for the cylindrical body, and making it fire-resistant. As for the fine refractory powder and large-diameter refractory particles that form the material layer, it is possible to use relatively low-grade and low-cost refractories. Furthermore, it is possible to reduce the number of times the fine refractory powder and large-diameter refractory particles that form the refractory layer are laminated, and therefore the overall cost does not increase, making it possible to manufacture thermocouple protection tubes at low cost. .
第１図は本発明の一実施例の縦断面図、第２１３は第１
図の実施例の横断面図、第３図は第１１１Ｎの部分拡大
断面図、第４図は従来のコーティング保護管の縦断面図
、第５図は第４図の保護管の横断面図、第６図は第４図
の部分拡大断面図である。
１ ・筒状体、３・ ・耐火物層、４微細耐火物粉末
、５ ・大径耐火物粒子、６・繊Ｈ１層
第１図
第２図FIG. 1 is a vertical cross-sectional view of one embodiment of the present invention, and FIG.
3 is a partially enlarged sectional view of 111N, FIG. 4 is a vertical sectional view of a conventional coated protection tube, and FIG. 5 is a cross sectional view of the protection tube shown in FIG. 4. FIG. 6 is a partially enlarged sectional view of FIG. 4. 1 - Cylindrical body, 3 - Refractory layer, 4 Fine refractory powder, 5 - Large diameter refractory particles, 6 - Fiber H1 layer Figure 1 Figure 2
Claims (1)
と、前記筒状体の外周に巻き付けられた耐火性繊維から
なる繊維層と、微細な耐火物粉末層と大粒の耐火物粒子
層を交互に積層してなり前記繊維層の表面に形成された
耐火物層とからなることを特徴とする熱電対用保護管。(1) A cylindrical body whose tip is sealed and into which a thermocouple can be inserted, a fiber layer made of refractory fibers wrapped around the outer periphery of the cylindrical body, a fine refractory powder layer, and large refractory particles. 1. A protective tube for a thermocouple, comprising a refractory layer formed on the surface of the fibrous layer, the layer being alternately laminated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22276888A JPH0269627A (en) | 1988-09-06 | 1988-09-06 | Protective tube for thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22276888A JPH0269627A (en) | 1988-09-06 | 1988-09-06 | Protective tube for thermocouple |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0269627A true JPH0269627A (en) | 1990-03-08 |
Family
ID=16787591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22276888A Pending JPH0269627A (en) | 1988-09-06 | 1988-09-06 | Protective tube for thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0269627A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280083B2 (en) * | 1998-01-12 | 2001-08-28 | Isuzu Ceramics Research Institute Co., Ltd. | Thermocouple lance with layered sheath for measuring temperature in molten metal |
| JP2006053128A (en) * | 2004-07-05 | 2006-02-23 | Heraeus Electro-Nite Internatl Nv | Container for molten metal, use of container, and method of determining interface layer |
| US7039346B2 (en) | 1998-12-22 | 2006-05-02 | Ricoh Company, Ltd. | Flexible toner container and toner delivery apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61262625A (en) * | 1985-05-16 | 1986-11-20 | Toyota Motor Corp | Protective pipe for thermocouple and its preparation |
-
1988
- 1988-09-06 JP JP22276888A patent/JPH0269627A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61262625A (en) * | 1985-05-16 | 1986-11-20 | Toyota Motor Corp | Protective pipe for thermocouple and its preparation |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6280083B2 (en) * | 1998-01-12 | 2001-08-28 | Isuzu Ceramics Research Institute Co., Ltd. | Thermocouple lance with layered sheath for measuring temperature in molten metal |
| US7039346B2 (en) | 1998-12-22 | 2006-05-02 | Ricoh Company, Ltd. | Flexible toner container and toner delivery apparatus |
| US7277665B2 (en) | 1998-12-22 | 2007-10-02 | Ricoh Company, Ltd. | Toner container configured for toner replenishment through blow system |
| JP2006053128A (en) * | 2004-07-05 | 2006-02-23 | Heraeus Electro-Nite Internatl Nv | Container for molten metal, use of container, and method of determining interface layer |
| US9829385B2 (en) | 2004-07-05 | 2017-11-28 | Heraeus Electro-Nite International N.V. | Container for molten metal, use of the container and method for determining an interface |
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