JPH041468Y2 - - Google Patents
Info
- Publication number
- JPH041468Y2 JPH041468Y2 JP3512885U JP3512885U JPH041468Y2 JP H041468 Y2 JPH041468 Y2 JP H041468Y2 JP 3512885 U JP3512885 U JP 3512885U JP 3512885 U JP3512885 U JP 3512885U JP H041468 Y2 JPH041468 Y2 JP H041468Y2
- Authority
- JP
- Japan
- Prior art keywords
- sheath
- thermocouple
- boron nitride
- magnesia
- insulating material
- 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
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 27
- 229910052582 BN Inorganic materials 0.000 claims description 14
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 14
- 239000000395 magnesium oxide Substances 0.000 claims description 14
- 239000011810 insulating material Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 150000002739 metals Chemical class 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 9
- 238000005259 measurement Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000809 Alumel Inorganic materials 0.000 description 1
- 229910001179 chromel Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、熱電対素線を金属製のシースで覆
い、このシースと熱電対素線との間に絶縁材を充
填したシース型熱電対に関する。[Detailed description of the invention] [Field of industrial application] This invention is a sheath type thermocouple in which the thermocouple wire is covered with a metal sheath and an insulating material is filled between the sheath and the thermocouple wire. Regarding.
第２図で示すように、従来の一般的なシース型
熱電対は、熱電対素線２と３にそれぞれアルメル
線とクロメル線が、絶縁材４にマグネシア（酸化
マグネシウム）が、またシース１にステンレス管
が使用されていた。このシース型熱電対で温度を
測定するときは、第３図で示すように、シース１
の端部から引き出された熱電対素線２と３の端部
を接合して測温接点５を設け、これを測温個所に
設置する。そして熱電対素線２，３の他端側を冷
接点６，７とし、この間の電位差を測定し、この
測定値と冷接点６，７の温度とから前記測温接点
５の温度を求める。
As shown in Fig. 2, a conventional general sheathed thermocouple uses an alumel wire and a chromel wire for the thermocouple wires 2 and 3, respectively, magnesia (magnesium oxide) for the insulating material 4, and a sheath 1 for the sheath 1. Stainless steel pipes were used. When measuring temperature with this sheath type thermocouple, as shown in Figure 3, the sheath 1
The ends of thermocouple wires 2 and 3 pulled out from the ends of the thermocouple wires 2 and 3 are joined to form a temperature measuring contact 5, which is installed at a temperature measuring point. Then, the other ends of the thermocouple wires 2 and 3 are used as cold junctions 6 and 7, and the potential difference therebetween is measured, and the temperature of the temperature measuring junction 5 is determined from this measured value and the temperature of the cold junctions 6 and 7.
一般に絶縁材４は、温度が高くなると絶縁性が
低下する性質を持つており、温度が100℃上昇す
ると、通常の絶縁材では絶縁抵抗が10-1〜10-2程
度低下する。このため、高温下での温度測定で
は、絶縁材４の絶縁抵抗が大幅に低下し、熱電対
素線２と３の間及びこれら熱電対素線２，３とシ
ース１との間に、その間の電位差に応じた電流が
流れる。これに伴い前記熱電対素線２と３の間の
電位差が変化する。すると、冷接点６と７の間で
は測温接点５との温度差に対応した電位差が示さ
れなくなり、測定結果に誤差を生じる。 In general, the insulating material 4 has a property that its insulation properties decrease as the temperature increases, and when the temperature increases by 100° C., the insulation resistance of a normal insulating material decreases by about 10 -1 to 10 -2 . For this reason, when measuring temperature at high temperatures, the insulation resistance of the insulating material 4 is significantly reduced, and there is A current flows according to the potential difference. Accordingly, the potential difference between the thermocouple wires 2 and 3 changes. Then, a potential difference corresponding to the temperature difference with the temperature measuring contact 5 is not shown between the cold contacts 6 and 7, and an error occurs in the measurement result.
こうしたことから、熱電対素線２，３及びシー
ス１の間には、できる限り絶縁抵抗の高い絶縁材
４を充填することが必要とされ、前記マグネシア
に代わり、窒化ボロン等の使用が試みられてい
る。 For this reason, it is necessary to fill the space between the thermocouple wires 2 and 3 and the sheath 1 with an insulating material 4 having as high insulation resistance as possible, and attempts have been made to use boron nitride or the like instead of magnesia. ing.
ところが、この窒化ボロンは、鱗片状の結晶体
からなつており、粉末状のマグネシアに比べて流
動性が悪い。
However, this boron nitride is composed of scale-like crystals and has poor fluidity compared to powdered magnesia.
一般にこの種のシース型熱電対は、第２図で示
すような構造のものを、ダイス引きやスエージン
グといつた方法で長手方向に延伸し、所定の線径
に調整する手段がとられる。しかし、流動性の悪
い窒化ボロンの場合は、延伸に伴うシース１の径
の変化に対応することが困難である。このため、
延伸して作られるシース型熱電対につていは、絶
縁材４として粉末状のマグネシアを使用する一
方、熱電対素線２，３の線径をできるだけ太くす
ることにより、絶縁材４に対する電気抵抗を相対
的に低くするという測定誤差低減の対策とられて
きた。 Generally, this type of sheath type thermocouple has a structure as shown in FIG. 2, and is stretched in the longitudinal direction by a method such as die drawing or swaging to adjust the wire diameter to a predetermined value. However, in the case of boron nitride, which has poor fluidity, it is difficult to cope with changes in the diameter of the sheath 1 due to stretching. For this reason,
For sheath type thermocouples made by stretching, powdered magnesia is used as the insulating material 4, and the electrical resistance to the insulating material 4 is reduced by making the wire diameters of the thermocouple wires 2 and 3 as thick as possible. Countermeasures have been taken to reduce measurement errors by making the value relatively low.
この考案は、従来のシース型熱電対における前
記の問題点を解消すべくなされたもので、熱電対
素線の間及びこれらとシースとの間に、高い絶縁
抵抗が得られ、しかも延伸による線径の変化にも
充分対応できるシース型熱電対を提供することを
目的とするものである。 This invention was made to solve the above-mentioned problems with conventional sheathed thermocouples, and it is possible to obtain high insulation resistance between the thermocouple wires and between these wires and the sheath, and to make the wires by stretching. The object of the present invention is to provide a sheath type thermocouple that can sufficiently cope with changes in diameter.
以下、この考案の構成を図面に基づき説明する
と、この考案によるシース型熱電対は、熱電対素
線１２，１３のまわりを窒化ボロン１５で覆い、
この窒化ボロン１５とシース１１の間にマグネシ
ア１４を充填したものである。
Hereinafter, the configuration of this invention will be explained based on the drawings. The sheath type thermocouple according to this invention covers the thermocouple wires 12 and 13 with boron nitride 15,
Magnesia 14 is filled between the boron nitride 15 and the sheath 11.
既に述べた通り、窒化ボロン１５は、流動性が
悪く、延伸に伴うシース１１の径の変化に対応し
難い。これに対してマグネシア１４は、流動性が
良く、シース１１の径の変化に比較的対応しやす
い。しかし、これを前記のように２層に配した場
合、シース１１の線径の変化に伴い、これら各層
の絶縁物が相互にどのように変動するかについて
は容易に予測できない。
As already mentioned, boron nitride 15 has poor fluidity and is difficult to respond to changes in the diameter of sheath 11 due to stretching. On the other hand, magnesia 14 has good fluidity and can relatively easily respond to changes in the diameter of the sheath 11. However, when these are arranged in two layers as described above, it is not easy to predict how the insulators in these layers will change with each other as the wire diameter of the sheath 11 changes.
本件考案者はこの点について検討した結果、延
伸に伴うシース１１の径の減少を、絶縁材の外層
を構成するマグネシア１４が吸収すると共に、こ
のマグネシア１４を介して窒化ボロン１５へ作用
する圧力が、シース１１の中心へ向けて概ね万遍
なく均等に分散されて働く。この結果、窒化ボロ
ン１５のシース１１径の変化に伴う長手方向への
移動が、それのみを充填した場合に比べてスムー
ズに行われ、これによつて、相当大幅な減径にも
対応できることが分かつた。 After considering this point, the present inventor found that the reduction in the diameter of the sheath 11 due to stretching is absorbed by the magnesia 14 constituting the outer layer of the insulating material, and the pressure acting on the boron nitride 15 through the magnesia 14 is reduced. , are almost evenly distributed and work towards the center of the sheath 11. As a result, the movement of the boron nitride 15 in the longitudinal direction as the diameter of the sheath 11 changes is smoother than in the case where only boron nitride is filled. I understand.
そしてこの場合、マグネシア１４に比べて絶縁
抵抗が高い窒化ボロン１５で熱電対素線１２と１
３が覆われているため、この間の絶縁抵抗がマグ
ネシア１４のみを充填した場合に比べて高くな
る。また、これら熱電対素線１２，１３とシース
１１の間にも前記窒化ボロン１５が介在されるた
め、この間の絶縁抵抗もマグネシア１４のみを充
電した場合に比べて高くなる。 In this case, the thermocouple wires 12 and 1 are made of boron nitride 15, which has higher insulation resistance than magnesia 14.
3 is covered, the insulation resistance during this period is higher than when only magnesia 14 is filled. Further, since the boron nitride 15 is also interposed between the thermocouple wires 12, 13 and the sheath 11, the insulation resistance therebetween is also higher than when only magnesia 14 is charged.
以上説明した通り、この考案によれば、延伸に
伴うシース径の大幅な変化にも対応することがで
きる。これと同様に、熱電対素線１２と１３及び
これら熱電対素線１２，１３とシース１１との間
の絶縁抵抗を高く維持できる結果、測定誤差を低
減することができるようになる。
As explained above, according to this invention, it is possible to cope with a large change in the sheath diameter due to stretching. Similarly, since the insulation resistance between the thermocouple wires 12 and 13 and between the thermocouple wires 12 and 13 and the sheath 11 can be maintained high, measurement errors can be reduced.
第１図はこの考案の実施例を示すシース型熱電
対の一部半断面斜視図、第２図はシース型熱電対
の従来例を示す一部半断面斜視図、第３図は同シ
ース型熱電対の使用状態を示す略示断面図であ
る。
１１……シース、１２，１３……熱電対素線、
１４……マグネシア、１５……窒化ボロン。
Fig. 1 is a partial half-sectional perspective view of a sheathed thermocouple showing an embodiment of this invention, Fig. 2 is a partial half-sectional perspective view showing a conventional example of a sheathed thermocouple, and Fig. 3 is the same sheath type thermocouple. FIG. 2 is a schematic cross-sectional view showing a thermocouple in use. 11... Sheath, 12, 13... Thermocouple wire,
14...Magnesia, 15...Boron nitride.
Claims (1)
種類の金属製の熱電対素線を収納したシース型熱
電対において、熱電対素線のまわりを窒化ボロン
で覆い、この窒化ボロンとシースとの間にマグネ
シアを充填してなることを特徴とするシース型熱
電対。 In a sheathed thermocouple, thermocouple wires made of different metals are housed in a sheath filled with an insulating material, the thermocouple wires are covered with boron nitride, and the space between the boron nitride and the sheath is A sheath type thermocouple characterized by being filled with magnesia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3512885U JPH041468Y2 (en) | 1985-03-12 | 1985-03-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3512885U JPH041468Y2 (en) | 1985-03-12 | 1985-03-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61152942U JPS61152942U (en) | 1986-09-22 |
| JPH041468Y2 true JPH041468Y2 (en) | 1992-01-20 |
Family
ID=30539124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3512885U Expired JPH041468Y2 (en) | 1985-03-12 | 1985-03-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH041468Y2 (en) |
-
1985
- 1985-03-12 JP JP3512885U patent/JPH041468Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61152942U (en) | 1986-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2054120A (en) | Pyrometric device | |
| US3005171A (en) | Electrical resistance type thermometer | |
| US4647710A (en) | Heat sensitive cable and method of making same | |
| US3317353A (en) | Thermocouple comprising intimately twisted wires | |
| US4638107A (en) | Heat sensitive tape and method of making same | |
| US3463674A (en) | Thermocouple having composite sheath | |
| US2694313A (en) | Brush thermocouple temperature measuring apparatus | |
| US6846983B1 (en) | Millivoltage generator | |
| JP2003057120A (en) | Multi-point temperature measuring device | |
| JPS5938623A (en) | Thermometer | |
| CN212779626U (en) | Quick temperature measuring thermocouple | |
| JPH07174639A (en) | Thermocouple compensating wire | |
| JPS6313610Y2 (en) | ||
| GB2107516A (en) | Thermocouple | |
| GB2341975A (en) | Thermocouple device and method of manufacture | |
| JPH0263172B2 (en) | ||
| JPH0131121B2 (en) | ||
| JPS64579Y2 (en) | ||
| JP6335125B2 (en) | Sheath type thermocouple and manufacturing method thereof | |
| JPH0537231Y2 (en) | ||
| US2827404A (en) | Elastic sheath cables | |
| JPS5930031A (en) | high temperature sensor | |
| JPS6234270Y2 (en) | ||
| JPH0464017B2 (en) | ||
| JPS585941Y2 (en) | thermocouple thermometer |