JP2002372461A - Thermocouple for molten metal - Google Patents

Thermocouple for molten metal

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Publication number
JP2002372461A
JP2002372461A JP2001180326A JP2001180326A JP2002372461A JP 2002372461 A JP2002372461 A JP 2002372461A JP 2001180326 A JP2001180326 A JP 2001180326A JP 2001180326 A JP2001180326 A JP 2001180326A JP 2002372461 A JP2002372461 A JP 2002372461A
Authority
JP
Japan
Prior art keywords
thermocouple
protective tube
molten metal
alloy
heat
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
Application number
JP2001180326A
Other languages
Japanese (ja)
Inventor
Hidenori Kita
英紀 北
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Priority to JP2001180326A priority Critical patent/JP2002372461A/en
Publication of JP2002372461A publication Critical patent/JP2002372461A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To obtain a thermocouple, for a molten metal, in which an alloy strand after its wear is recovered easily and in which a conventional display part can be used as it is. SOLUTION: A protective tube 13 which is composed of a heat-resistant material is inserted into, and passed through, the inside of a heat insulating tube 4 by keeping a gap, and the closed tip part 13a of the protective tube 13 protrudes from the tip of the tube 4. An adhesive 8 is filled into the gap between the tip of the tube 4 and the protective tube 13. A pair of alloy strands 9, 10 whose compositions are different are inserted into the inside of the protective tube 13, and a temperature measuring junction 14 which is formed by coupling tips of the pair of alloy strands 9, 10 is fixed to the inner surface at the tip of the protective tube 13.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明はアルミニウム，銅，
鋳鉄などの金属溶湯の温度測定に用いる熱電対に関する
ものである。TECHNICAL FIELD The present invention relates to aluminum, copper,
The present invention relates to a thermocouple used for measuring the temperature of a molten metal such as cast iron.

【０００２】[0002]

【従来の技術】従来、金属溶湯の温度測定には消耗型熱
電対が使用されている。つまり、従来の金属溶湯用熱電
対は、窒化珪素からなる保護管の内部に、成分の異なる
１対の合金素線［タングステン−レニウム（ W-5Re，W-
26Re）］を挿入し、保護管と合金素線との間の空隙に、
窒化珪素ベースの耐熱性ガラスまたは反応焼結窒化珪素
を充填した構成のものである。また、窒化珪素からなる
保護管の先端外面には、耐溶損性を改善するために、モ
リブデン−硼化ジルコニウム Mo-ZrB2の被膜が溶射など
により形成される。上述の消耗型金属溶湯用熱電対は応
答性に優れ、高温域までの温度測定が可能であるが、セ
ラミックからなる保護管と合金素線が一体化されている
ので、組立てに時間と手数がかかり、また消耗後の高価
な合金素線の回収が難しい。また、消耗型金属溶湯用熱
電対の熱起電力特性が市販の白金−ロジウム系の消耗型
金属溶湯用熱電対とは異なるので、これに適合した表示
部を作製する必要がある。2. Description of the Related Art Conventionally, a consumable thermocouple has been used for measuring the temperature of a molten metal. In other words, the conventional thermocouple for molten metal is a pair of alloy wires [Tungsten-Rhenium (W-5Re, W-
26Re)] into the gap between the protective tube and the alloy strand,
It has a structure filled with heat-resistant glass based on silicon nitride or reactive sintered silicon nitride. Further, the distal end outer surface of the protective tube made of silicon nitride, in order to improve the melting loss resistance, molybdenum - of zirconium boride Mo-ZrB 2 film is formed by a thermal spraying. The above-mentioned thermocouple for consumable metal melt has excellent responsiveness and can measure temperature up to a high temperature range.However, since the protective tube made of ceramic and the alloy element wire are integrated, it takes time and trouble to assemble. In addition, it is difficult to recover expensive alloy strands after consumption. Further, since the thermoelectromotive force characteristics of the consumable metal melt thermocouple are different from those of a commercially available platinum-rhodium-based consumable metal melt thermocouple, it is necessary to manufacture a display unit adapted to this.

【０００３】[0003]

【発明が解決しようとする課題】本発明の課題は上述の
問題に鑑み、消耗後の合金素線の回収が容易であり、従
来の表示部をそのまま使用できる金属溶湯用熱電対を提
供することにある。SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a thermocouple for molten metal in which it is easy to recover spent alloy wires and can use a conventional display portion as it is. It is in.

【０００４】[0004]

【課題を解決するための手段】上記課題を解決するため
に、本発明の構成は断熱筒の内部に耐熱性材料からなる
保護管を空隙を存して挿通し、前記保護管の閉鎖された
先端部を前記断熱筒の先端から突出し、前記断熱筒の先
端と前記保護管との空隙に接着剤を充填し、前記保護管
の内部に組成の異なる１対の合金素線を挿入し、１対の
合金素線の先端を互いに結合してなる測温接点を前記保
護管の先端内面に固定したことを特徴とする。In order to solve the above-mentioned problems, according to the structure of the present invention, a protective tube made of a heat-resistant material is inserted into a heat insulating cylinder with a gap therebetween, and the protective tube is closed. A tip is protruded from a tip of the heat insulating cylinder, an adhesive is filled in a gap between the tip of the heat insulating cylinder and the protection tube, and a pair of alloy wires having different compositions are inserted into the protection tube. A temperature measuring contact formed by connecting the tips of a pair of alloy wires to each other is fixed to the inner surface of the tip of the protective tube.

【０００５】[0005]

【発明の実施の形態】本発明では合金素線の（＋）脚に
白金ロジウムPt-Rh 合金を使用し、合金素線の（−）脚
に白金Ptまたは白金ロジウムPt-Rh 合金を使用する。窒
化珪素 Si3N4などの耐熱性に優れた小径の保護管を、堅
牢性を与えるための積層材などからなる大径の断熱筒に
空隙を存して挿通し、断熱筒の先端と保護管の先端部と
の空隙に接着剤を充填する。合金素線の先端の測温接点
を保護管の先端内面に接着することにより応答性を高め
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a platinum rhodium Pt-Rh alloy is used for the (+) leg of the alloy wire, and platinum Pt or platinum rhodium Pt-Rh alloy is used for the (-) leg of the alloy wire. . Insert a small-diameter protective tube with excellent heat resistance, such as silicon nitride Si 3 N 4 , into a large-diameter heat-insulating cylinder made of a laminated material to provide robustness, with a gap, and protect the tip of the heat-insulating cylinder. Fill the gap with the tip of the tube with adhesive. Responsiveness is improved by bonding the temperature measuring contact at the tip of the alloy wire to the inner surface of the tip of the protection tube.

【０００６】[0006]

【実施例】図１に示すように、本発明による金属溶湯用
熱電対は、断熱筒４の内部に耐熱性材料からなる保護管
１３が空隙を存して挿通され、保護管１３の閉鎖された
先端部１３ａが断熱筒４の先端から突出される。断熱筒
４の先端と保護管１３との空隙に接着剤８が充填され
る。保護管１３の内部には組成の異なる１対の合金素線
９，１０が挿入され、１対の合金素線９，１０の先端を
互いに結合してなる測温接点１４が保護管１３の先端内
面に固定される。As shown in FIG. 1, in a thermocouple for molten metal according to the present invention, a protective tube 13 made of a heat-resistant material is inserted into a heat insulating tube 4 with a gap therebetween, and the protective tube 13 is closed. The tip portion 13a protrudes from the tip of the heat insulating cylinder 4. The adhesive 8 is filled in the gap between the tip of the heat insulating cylinder 4 and the protective tube 13. A pair of alloy wires 9 and 10 having different compositions are inserted into the inside of the protection tube 13, and a temperature measuring contact 14 formed by connecting the tips of the pair of alloy wires 9 and 10 to each other is connected to the tip of the protection tube 13. Fixed to the inner surface.

【０００７】断熱筒４は窒化珪素 Si3N4を主成分とする
材料からなる層４ａと、窒化珪素 Si3N4に窒化硼素BN１
０〜４０vol.％を含有する材料からなる層４ｂとを交互
に密着して積層したうえ焼結した積層体から構成され
る。各層の厚さは６０〜１００μｍであり、積層数は３
０〜４０層である。断熱筒４の最外層は窒化珪素 Si3N4
に窒化硼素BNを添加した材料からなる層４ｂとされる。[0007] heat insulating cylinder 4 and the layer 4a made of a material mainly composed of silicon nitride Si 3 N 4, boron nitride silicon nitride Si 3 N 4 BN1
A layer 4b made of a material containing 0 to 40 vol. The thickness of each layer is 60 to 100 μm, and the number of layers is 3
0 to 40 layers. The outermost layer of the heat insulating cylinder 4 is silicon nitride Si 3 N 4
4b made of a material to which boron nitride BN is added.

【０００８】詳しくは、断熱筒４の各層４ａ，４ｂを構
成する材料には、窒化珪素 Si3N4を主成分とし、焼結助
剤としてアルミナ Al2O3，イットリアY2O3，酸化タンタ
ル Ta2O5の内の少くとも１つが添加される。More specifically, the material constituting each of the layers 4a and 4b of the heat insulating cylinder 4 is mainly composed of silicon nitride Si 3 N 4 , and sintering aids such as alumina Al 2 O 3 , yttria Y 2 O 3 , oxide At least one of the tantalum Ta 2 O 5 is added.

【０００９】耐熱性を有する保護管１３は、窒化珪素 S
i3N4、サイアロン、炭化珪素 SiC、アルミナAl2O3 の内
の少くとも１つから構成されるか、これらの複合物から
構成される。詳しくは、保護管１３を構成する材料に
は、窒化珪素 Si3N4または炭化珪素 SiCを主成分とし、
焼結助剤としてアルミナ Al2O3，イットリアY2O3，酸化
タンタル Ta2O5の内の少くとも１つが添加される。保護
管１３の外表面には保護管とは異なる成分、つまりモリ
ブデンMoを主成分とする被膜１３ｂが形成される。好ま
しくは、被膜１３ｂはモリブデンMoと硼化ジルコニウム
ZrB2との複合体から構成される。The protective tube 13 having heat resistance is made of silicon nitride S
It is composed of at least one of i 3 N 4 , Sialon, silicon carbide SiC, alumina Al 2 O 3 or a composite thereof. Specifically, the material constituting the protective tube 13 is mainly composed of silicon nitride Si 3 N 4 or silicon carbide SiC,
At least one of alumina Al 2 O 3 , yttria Y 2 O 3 , and tantalum oxide Ta 2 O 5 is added as a sintering aid. On the outer surface of the protective tube 13, a coating 13b containing a component different from that of the protective tube, that is, molybdenum (Mo) as a main component is formed. Preferably, the coating 13b comprises molybdenum Mo and zirconium boride.
Composed of a composite body of ZrB 2.

【００１０】断熱筒４と保護管１３との間の間隙には、
断熱性に優れたセラミックフアイバが充填される。セラ
ミックフアイバを構成するセラミックにはアルミニウム
Al，リン P，酸素 O，マグネシウムMgが含まれる。断熱
筒４と保護管１３とはセラミックフアイバを挟んで固定
され、保護管１３の先端部１３ａから断熱筒４への熱流
が減じられる。In the gap between the heat insulating tube 4 and the protective tube 13,
Filled with ceramic fiber with excellent heat insulation. Aluminum is used for the ceramic that composes the ceramic fiber.
Al, phosphorus P, oxygen O, and magnesium Mg are included. The heat insulating tube 4 and the protective tube 13 are fixed with a ceramic fiber interposed therebetween, and the heat flow from the distal end 13a of the protective tube 13 to the heat insulating tube 4 is reduced.

【００１１】熱電対を構成する合金素線９，１０の測温
接点１４は保護管１３の先端内面に無機系の接着剤によ
り接合される。図示してないが、合金素線９，１０の基
端１０ａ，１０ｂは互いに接合されて基準接点を構成
し、所定の温度（例えば０℃）に保たれる。測温接点１
４と基準接点との間に両者間の電位差を計測する表示部
が接続され、電位差から測温接点１４の温度が求められ
る。合金素線９，１０の代表的な組成は次のとおりであ
る。つまり、合金素線の（＋）脚がロジウムRh３０％を
含有する白金合金であり、合金素線の（−）脚がロジウ
ムRh６％を含有する白金合金である。別の対では合金素
線の（＋）脚がロジウムRh１３％を含有する白金合金で
あり、合金素線の（−）脚がロジウムRh１０％を含有す
る白金合金である。The temperature measuring contacts 14 of the alloy wires 9 and 10 constituting the thermocouple are joined to the inner surface of the distal end of the protective tube 13 with an inorganic adhesive. Although not shown, the base ends 10a and 10b of the alloy wires 9 and 10 are joined together to form a reference contact, and are maintained at a predetermined temperature (for example, 0 ° C.). Temperature measuring contact 1
A display unit for measuring a potential difference between the two is connected between the reference contact 4 and the reference contact, and the temperature of the temperature measuring contact 14 is obtained from the potential difference. A typical composition of the alloy wires 9 and 10 is as follows. That is, the (+) leg of the alloy wire is a platinum alloy containing 30% rhodium Rh, and the (-) leg of the alloy wire is a platinum alloy containing 6% rhodium Rh. In another pair, the (+) leg of the alloy wire is a platinum alloy containing 13% rhodium Rh, and the (-) leg of the alloy wire is a platinum alloy containing 10% rhodium Rh.

【００１２】［具体的実施例］窒化珪素からなる細い保
護管１３の内部に、線径が０．２５ｍｍの１対の合金素
線を挿入した。一方の合金素線にはアルミナからなる絶
縁管を外挿し、合金素線の（＋）脚と（−）脚が互いに
接触しないようにした。[Specific Example] A pair of alloy wires each having a wire diameter of 0.25 mm were inserted into a thin protective tube 13 made of silicon nitride. An insulating tube made of alumina was extrapolated to one of the alloy wires so that the (+) leg and the (-) leg of the alloy wire did not contact each other.

【００１３】合金素線の（＋）脚にはロジウム３０％を
含有する白金合金を、合金素線の（−）脚にはロジウム
６％を含有する白金合金を用いた（Ｂ型）。A platinum alloy containing 30% rhodium was used for the (+) leg of the alloy wire, and a platinum alloy containing 6% rhodium was used for the (-) leg of the alloy wire (B type).

【００１４】他の例として、合金素線の（＋）脚にはロ
ジウム１３％を含有する白金合金を、合金素線の（−）
脚には白金を用いた（Ｒ型）。As another example, a platinum alloy containing 13% of rhodium is used for the (+) leg of the alloy wire, and the (-)
Platinum was used for the legs (R type).

【００１５】他の例として、合金素線の（＋）脚にはロ
ジウム１０％を含有する白金合金を、合金素線の（−）
脚には白金を用いた（Ｓ型）。As another example, a platinum alloy containing 10% rhodium is used for the (+) leg of the alloy wire, and the (-)
Platinum was used for the legs (S type).

【００１６】本発明による金属溶湯熱電対を用いて温度
１４５０℃の鋳鉄溶湯の温度を測定した結果、保護管１
３の先端内面に合金素線９，１０の測温接点１４を無機
系の耐熱性接着剤により接着した金属溶湯熱電対の応答
性は約８秒、繰返し使用可能の回数は４００回であつ
た。また、保護管１３の先端内面に合金素線９，１０の
測温接点１４を密着しただけの金属溶湯熱電対の応答性
は９秒、繰返し使用可能の回数は６２０回であつた。As a result of measuring the temperature of the molten cast iron at a temperature of 1450 ° C. using the molten metal thermocouple according to the present invention, the protective tube 1 was measured.
The responsivity of the molten metal thermocouple in which the temperature measuring contacts 14 of the alloy wires 9 and 10 were bonded to the inner surface of the tip of the metal wire 3 with an inorganic heat-resistant adhesive was about 8 seconds, and the number of reusable times was 400 times. . In addition, the responsiveness of the molten metal thermocouple in which the temperature measuring contacts 14 of the alloy wires 9 and 10 were just brought into close contact with the inner surface of the distal end of the protective tube 13 was 9 seconds, and the number of times of repeated use was 620 times.

【００１７】なお、銅溶湯や鋳鉄溶湯のような高温の金
属溶湯には、上述の組合せの合金素線が使用されるが、
低温の金属溶湯には、各合金素線は同じでも例えば合金
素線の（＋）脚と合金素線の（−）脚に、ニッケル基の
合金を使用してもよい。For a high-temperature metal melt such as a copper melt or a cast iron melt, an alloy wire of the above combination is used.
For the low-temperature molten metal, the alloy wires may be the same or, for example, a nickel-based alloy may be used for the (+) leg of the alloy wire and the (-) leg of the alloy wire.

【００１８】[0018]

【発明の効果】本発明は上述のように、断熱筒の内部に
耐熱性材料からなる保護管を空隙を存して挿通し、前記
保護管の閉鎖された先端部を前記断熱筒の先端から突出
し、前記断熱筒の先端と前記保護管との空隙に接着剤を
充填し、前記保護管の内部に組成の異なる１対の合金素
線を挿入し、１対の合金素線の先端を互いに結合してな
る測温接点を前記保護管の先端内面に固定したので、生
産性と耐久性が向上され、製造単価が低減される。As described above, according to the present invention, a protective tube made of a heat-resistant material is inserted into a heat insulating tube with a gap therebetween, and the closed end of the protective tube is moved from the front end of the heat insulating tube. Protruding, filling the gap between the tip of the heat insulating cylinder and the protection tube with an adhesive, inserting a pair of alloy wires having different compositions into the inside of the protection tube, and connecting the tips of the pair of alloy wires to each other. Since the joined temperature measuring contact is fixed to the inner surface of the distal end of the protective tube, productivity and durability are improved, and the manufacturing cost is reduced.

【００１９】合金素線の成分である白金と白金合金の回
収が容易であり、また市販の消耗型金属溶湯用熱電対に
使用される合金素線と成分が同じであるので、熱起電力
の特性が等しく、表示部をそのまま使用できる。It is easy to recover platinum and a platinum alloy, which are the components of the alloy wire, and since the components are the same as those of the alloy wire used in the commercially available thermocouple for consumable metal melt, the thermoelectromotive force is reduced. The characteristics are equal and the display unit can be used as it is.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明に係る金属溶湯用熱電対の側面断面図で
ある。FIG. 1 is a side sectional view of a thermocouple for molten metal according to the present invention.

【符号の説明】 ４：断熱筒 ５：空隙 ６：絶縁管 ７：空隙 ８：無
機接着剤 ９，１０：合金素線 ９ａ，１０ａ：端子
１２：被膜 １３：保護管 １３ａ：先端部 １４：測
温接点[Explanation of Signs] 4: Heat insulation cylinder 5: Air gap 6: Insulation tube 7: Air gap 8: Inorganic adhesive 9, 10: Alloy wire 9a, 10a: Terminal
12: Coating 13: Protection tube 13a: Tip 14: Temperature measuring contact

Claims (13)

【特許請求の範囲】[Claims] 【請求項１】断熱筒の内部に耐熱性材料からなる保護管
を空隙を存して挿通し、前記保護管の閉鎖された先端部
を前記断熱筒の先端から突出し、前記断熱筒の先端と前
記保護管との空隙に接着剤を充填し、前記保護管の内部
に組成の異なる１対の合金素線を挿入し、１対の合金素
線の先端を互いに結合してなる測温接点を前記保護管の
先端内面に固定したことを特徴とする、金属溶湯用熱電
対。1. A protective tube made of a heat-resistant material is inserted into a heat-insulating cylinder with a gap therebetween, and a closed end of the protective tube projects from the distal end of the heat-insulating cylinder. An adhesive is filled in a gap between the protective tube and a pair of alloy wires having different compositions are inserted into the protective tube, and a temperature measuring contact formed by connecting the tips of the pair of alloy wires to each other is formed. A thermocouple for molten metal, wherein the thermocouple is fixed to an inner surface of a distal end of the protective tube. 【請求項２】前記合金素線の（＋）脚がロジウム３０％
を含有する白金合金であり、前記合金素線の（−）脚が
ロジウム６％を含有する白金合金であるか、前記合金素
線の（＋）脚がロジウム１３％を含有する白金合金であ
り、前記合金素線の（−）脚が白金であるか、前記合金
素線の（＋）脚がロジウム１０％を含有する白金合金で
あり、前記合金素線の（−）脚が白金である、請求項１
に記載の金属溶湯用熱電対。2. The alloy wire has a (+) leg of 30% rhodium.
And the (-) leg of the alloy strand is a platinum alloy containing 6% rhodium, or the (+) leg of the alloy strand is a platinum alloy containing 13% rhodium. The (-) leg of the alloy strand is platinum, or the (+) leg of the alloy strand is a platinum alloy containing 10% rhodium, and the (-) leg of the alloy strand is platinum. , Claim 1
The thermocouple for molten metal described in the above. 【請求項３】前記保護管を構成する耐熱性材料が窒化珪
素、サイアロン、炭化珪素、アルミナの１つまたはこれ
らの複合物である、請求項１に記載の金属溶湯用熱電
対。3. The thermocouple for molten metal according to claim 1, wherein the heat-resistant material forming the protective tube is one of silicon nitride, sialon, silicon carbide, and alumina, or a composite thereof. 【請求項４】前記保護管の表面に該保護管とは異なる成
分の被膜が形成されている、請求項１，３に記載の金属
溶湯用熱電対。4. The thermocouple for molten metal according to claim 1, wherein a coating of a component different from that of the protective tube is formed on a surface of the protective tube. 【請求項５】前記被膜がモリブデンを主成分とする、請
求項４に記載の金属溶湯用熱電対。5. The thermocouple for molten metal according to claim 4, wherein said coating mainly comprises molybdenum. 【請求項６】前記被膜がモリブデンと硼化ジルコニウム
との複合体である、請求項４に記載の金属溶湯用熱電
対。6. A thermocouple for molten metal according to claim 4, wherein said coating is a composite of molybdenum and zirconium boride. 【請求項７】前記断熱筒は窒化珪素を主成分とする材料
からなる層と、窒化珪素に窒化硼素１０〜４０vol.％を
含有する材料からなる層とを交互に密着して積層したも
のである、請求項１に記載の金属溶湯用熱電対。7. The heat insulating cylinder is formed by alternately contacting and laminating a layer composed of a material containing silicon nitride as a main component and a layer composed of silicon nitride containing 10 to 40 vol.% Of boron nitride. The thermocouple for molten metal according to claim 1. 【請求項８】前記断熱筒は各層の厚さが６０〜１００μ
ｍ、積層数が３０〜４０層であり、最外層が窒化珪素を
主成分とする材料に窒化硼素を含有する、請求項１に記
載の金属溶湯用熱電対。8. The heat insulating cylinder has a thickness of each layer of 60 to 100 μm.
The thermocouple for molten metal according to claim 1, wherein m, the number of layers is 30 to 40, and the outermost layer contains boron nitride in a material containing silicon nitride as a main component. 【請求項９】前記保護管は窒化珪素を主成分とする材料
に、アルミナ，イットリア，酸化タンタルの内の１つま
たはこれらの複合物を添加してなる、請求項１に記載の
金属溶湯用熱電対。9. The molten metal as set forth in claim 1, wherein said protective tube is formed by adding one of alumina, yttria, and tantalum oxide or a compound thereof to a material containing silicon nitride as a main component. thermocouple. 【請求項１０】前記断熱筒を構成する窒化珪素は、焼結
助剤としてアルミナ，イットリア，酸化タンタルの内の
１つまたはこれらの複合物を含有する、請求項１に記載
の金属溶湯用熱電対。10. The thermoelectric element for molten metal according to claim 1, wherein said silicon nitride forming said heat insulating cylinder contains one of alumina, yttria and tantalum oxide or a composite thereof as a sintering aid. versus. 【請求項１１】前記断熱筒と前記保護管との空隙に断熱
性に優れたセラミックフアイバを充填して前記断熱筒に
前記保護管を固定し、前記保護管の先端部から前記断熱
筒の内部への熱流を減じる、請求項１に記載の金属溶湯
用熱電対。11. A space between the heat insulating cylinder and the protective tube is filled with a ceramic fiber having excellent heat insulating properties, and the protective tube is fixed to the heat insulating tube. The thermocouple for molten metal according to claim 1, which reduces a heat flow to the metal. 【請求項１２】前記断熱性のセラミックはアルミニウム
とリンと酸素とマグネシウムとを含んでいる、請求項１
１に記載の金属溶湯用熱電対。12. The thermal insulating ceramic according to claim 1, wherein said ceramic comprises aluminum, phosphorus, oxygen and magnesium.
2. The thermocouple for molten metal according to 1. 【請求項１３】前記合金素線の測温接点が前記保護管の
先端内面に無機系の接着剤により固定される、請求項１
に金属溶湯用熱電対。13. The temperature measuring contact of the alloy strand is fixed to the inner surface of the distal end of the protective tube with an inorganic adhesive.
Thermocouple for molten metal.
JP2001180326A 2001-06-14 2001-06-14 Thermocouple for molten metal Pending JP2002372461A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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JP2002372461A true JP2002372461A (en) 2002-12-26

Family

ID=19020767

Family Applications (1)

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