JPH0263172B2 - - Google Patents
Info
- Publication number
- JPH0263172B2 JPH0263172B2 JP8330183A JP8330183A JPH0263172B2 JP H0263172 B2 JPH0263172 B2 JP H0263172B2 JP 8330183 A JP8330183 A JP 8330183A JP 8330183 A JP8330183 A JP 8330183A JP H0263172 B2 JPH0263172 B2 JP H0263172B2
- Authority
- JP
- Japan
- Prior art keywords
- thermocouple
- nicrosil
- nisil
- heat resistance
- protective tube
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
(1) 発明の分野
この発明は、耐熱性の向上を図つた熱電対に関
するものである。
(2) 従来技術
異種金属を接合して温度を測定する熱電対には
種々のものがあるが、熱電対、保護管の耐熱特性
の向上が望まれている。
特にステンレス（たとえばSUS310S）、インコ
ネル等の金属保護管は、1100℃以上の高温雰囲気
では酸化による劣化のため、長時間使用すること
は困難であつた。
(3) 発明の目的
この発明の目的は、以上の点に鑑み、酸化雰囲
気における耐熱特性の向上を図つた熱電対を提供
することである。
(4) 発明の実施例
従来からNiを主体としたＫ熱電対（クロメ
ル・アルメル）が知られているが、近年、これの
改良として、Cr、Si、Mgを含み、耐熱性を向上
させたナイクロシル・ナイシル（nicrosil−nisil）
熱電対が開発された。その組成は次表の通りであ
る。
(1) Field of the Invention The present invention relates to a thermocouple with improved heat resistance. (2) Prior Art There are various types of thermocouples that measure temperature by joining dissimilar metals, but it is desired to improve the heat resistance characteristics of thermocouples and protection tubes. In particular, it has been difficult to use metal protective tubes made of stainless steel (for example, SUS310S), Inconel, etc. for long periods of time due to deterioration due to oxidation in high-temperature atmospheres of 1100° C. or higher. (3) Purpose of the Invention In view of the above points, the purpose of the present invention is to provide a thermocouple with improved heat resistance in an oxidizing atmosphere. (4) Embodiments of the invention K thermocouples (chromel/alumel), which mainly contain Ni, have been known for a long time, but in recent years, as an improvement on this, thermocouples containing Cr, Si, and Mg have been developed to improve heat resistance. nicrosil-nisil
Thermocouple was developed. Its composition is shown in the table below.
【表】
本願発明は、このナイクロシルまたはナイシル
と熱電対の保護管として用いたものである。
第１図は、この発明の一実施例を示す構成説明
図である。
図において、１は上記ナイクロシルまたはナイ
シルよりなる保護管、２は保護管１内に設けられ
た熱電対で、保護管１内に絶縁剤３を充填し、こ
の保護管１を減径加工してシース構造としたもの
でもよい。
このように保護管１として、ナイクロシルまた
はナイシルを用いることにより、酸化雰囲気にお
ける耐熱特性に大幅に向上させることができる。
つまり、ナイクロシルは、Cf、Siを多く含み、
これらにより酸化皮膜が形成され、表面を覆い、
内部酸化を防ぐ。また、ナイシルは、Si、Mgを
含み同様に内部酸化を防止するとともに、機械的
強度が強く、シース構造とするといつそう強度は
増大する。
1100℃で、3000時間以上、空気中で加熱した場
合、クロメル・アルメルでは酸化皮膜の厚さは約
0.3mmに対し、ナイクロシル・ナイシルでは約
0.15mmで半分であり、内部酸化が少なく高温にお
ける耐熱特性が大きい。
（TEMPERATURE1982.1129頁）
特に、熱電対としてナイクロシル・ナイシルを
用いると保護管と同材質のため、シース構造とし
た場合、熱膨張率の差はなく、素線の断線等は少
ない。
第２図は、他の実施例を示し、保護管４の先端
に１本の素線５を固着し、保護管４と素線５とで
ナイクロシル・ナイシル熱電対を形成し小型化を
図り、保護管４にナイクロシルまたはナイシルを
用いて耐熱性の向上を図つている。
(5) 発明の要約
以上述べたように、この発明は、熱電対の保護
管として、ナイクロシルまたはナイシルを用いた
熱電対である。
(6) 発明の効果
酸化雰囲気において大幅に耐熱性を向上させる
ことができ、特に熱電対素線としてナイクロシ
ル・ナイシルを用いた熱電対に適用すれば、いつ
そう長寿命化が図れる。また、ナイシルの方が加
工性に富み、保護管として用いた場合、機械的強
度が強い。また、ナイクロシルを保護管として使
用する場合、Mgを添加すると、いつそう酸化雰
囲気での耐熱性が向上する。また、従来、ステン
レス等の保護管をナイクロシル・ナイシル熱電対
に用いると両者の熱膨張率が異なるため特にシー
ス構造とした場合、素線等の断線が生じやすかつ
たが、本願発明では、そのようなことはない。[Table] The present invention uses this Nicrosil or Nisil as a protective tube for a thermocouple. FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention. In the figure, 1 is a protection tube made of Nicrosil or Nisil, and 2 is a thermocouple installed in the protection tube 1. The protection tube 1 is filled with an insulating agent 3, and the protection tube 1 is processed to reduce its diameter. It may also have a sheath structure. By using Nicrosil or Nisil as the protective tube 1 in this way, the heat resistance characteristics in an oxidizing atmosphere can be greatly improved. In other words, Nicrosil contains a lot of Cf and Si,
An oxide film is formed by these, covering the surface,
Prevents internal oxidation. In addition, Nisil contains Si and Mg, which similarly prevents internal oxidation, and has strong mechanical strength, and the strength increases the more it is formed into a sheath structure. When heated in air at 1100℃ for more than 3000 hours, the thickness of the oxide film on chromel and alumel is approximately
0.3mm compared to about 0.3mm for Nicrosil and Nisil
At 0.15mm, it is half that, so there is little internal oxidation and high heat resistance at high temperatures.
(TEMPERATURE 1982.1129 page) In particular, when Nicrosil/Nisil is used as a thermocouple, it is made of the same material as the protective tube, so when it has a sheath structure, there is no difference in the coefficient of thermal expansion, and there is little chance of wire breakage. FIG. 2 shows another embodiment, in which a single wire 5 is fixed to the tip of the protective tube 4, and the protective tube 4 and the wire 5 form a Nicrosil/Nisil thermocouple to achieve miniaturization. Nicrosil or Nisil is used for the protection tube 4 to improve heat resistance. (5) Summary of the Invention As described above, the present invention is a thermocouple that uses Nicrosil or Nisil as a thermocouple protection tube. (6) Effects of the invention The heat resistance can be greatly improved in an oxidizing atmosphere, and especially when applied to thermocouples using Nicrosil/Nisil as the thermocouple wire, the lifespan can be significantly extended. In addition, Nisil has better workability and has higher mechanical strength when used as a protective tube. Furthermore, when Nicrosil is used as a protective tube, adding Mg will improve the heat resistance in an oxidizing atmosphere. In addition, conventionally, when a protective tube made of stainless steel or the like is used for a Nicrosil/Nisil thermocouple, the coefficient of thermal expansion of the two is different, so the wires are likely to break, especially when a sheath structure is used. There is no such thing.
第１図、第２図は、この発明の一実施例を示す
構成説明図である。
１……保護管、２……熱電対、３……絶縁剤。
FIGS. 1 and 2 are configuration explanatory diagrams showing one embodiment of the present invention. 1... Protection tube, 2... Thermocouple, 3... Insulating material.
Claims (1)
ナイシルを用いたことを特徴とする熱電対。 ２ 熱電対として、ナイクロシル・ナイシルを用
いたことを特徴とする特許請求の範囲第１項記載
の熱電対。 ３ 保護管と１本の熱電対素線とでナイクロシ
ル・ナイシル熱電対を構成したことを特徴とする
特許請求の範囲第１項記載の熱電対。 ４ 前記保護管内に絶縁剤を充填したことを特徴
とする特許請求の範囲第１項から第３項記載の熱
電対。[Scope of Claims] 1. A thermocouple characterized in that Nicrosil or Nisil is used as a protective tube of the thermocouple. 2. The thermocouple according to claim 1, characterized in that Nicrosil/Nisil is used as the thermocouple. 3. The thermocouple according to claim 1, characterized in that the Nicrosil/Nisil thermocouple is constituted by a protection tube and one thermocouple element wire. 4. The thermocouple according to claims 1 to 3, wherein the protective tube is filled with an insulating agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8330183A JPS59208425A (en) | 1983-05-12 | 1983-05-12 | Thermocouple |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8330183A JPS59208425A (en) | 1983-05-12 | 1983-05-12 | Thermocouple |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59208425A JPS59208425A (en) | 1984-11-26 |
| JPH0263172B2 true JPH0263172B2 (en) | 1990-12-27 |
Family
ID=13798582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8330183A Granted JPS59208425A (en) | 1983-05-12 | 1983-05-12 | Thermocouple |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59208425A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU613902B2 (en) * | 1987-05-14 | 1991-08-15 | Nicrobell Pty Limited | Stable high-temperature thermocouple cable |
| AU622856B2 (en) * | 1987-10-23 | 1992-04-30 | Nicrobell Pty Limited | Thermocouples of enhanced stability |
-
1983
- 1983-05-12 JP JP8330183A patent/JPS59208425A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59208425A (en) | 1984-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6190038B1 (en) | Thermocouple lance with alternating molybdenum layered sheath for measuring temperature in molten metal bath | |
| CA1305538C (en) | High-temperature mineral-insulated metal-sheathed cable | |
| JPH01501108A (en) | stable metal sheathed thermocouple cable | |
| US4909855A (en) | Stable high-temperature thermocouple cable | |
| US3317353A (en) | Thermocouple comprising intimately twisted wires | |
| US3329534A (en) | Thermocouple with platinum group metal inner sheath | |
| JPH0263172B2 (en) | ||
| JP3572312B2 (en) | Ceramic sheath type thermocouple | |
| US2472808A (en) | Thermocouple junction with radiation shield | |
| CA1085967A (en) | Thermocouple probe | |
| JP3416101B2 (en) | Double metal tube sheath | |
| JPH0882557A (en) | Sheath thermocouple | |
| JP2006090742A (en) | Sheath type K thermocouple | |
| JPS598294A (en) | Method of producing sheathed heater | |
| JP3014093U (en) | Temperature sensor with thermocouple and protective tube integrated | |
| JP3329189B2 (en) | Ceramic sheath type thermocouple | |
| US2121930A (en) | Heating device and the like | |
| JPS6313610Y2 (en) | ||
| JP3003567B2 (en) | Temperature detector | |
| JPH041468Y2 (en) | ||
| JPH0262811B2 (en) | ||
| US2957037A (en) | Thermocouple | |
| JPH08152364A (en) | High-temperature measuring platinum resistor element | |
| JPS63190301A (en) | thermistor | |
| JP3550828B2 (en) | Thermocouple structure |