JPH06103228B2 - Temperature rise detector - Google Patents
Temperature rise detectorInfo
- Publication number
- JPH06103228B2 JPH06103228B2 JP9638184A JP9638184A JPH06103228B2 JP H06103228 B2 JPH06103228 B2 JP H06103228B2 JP 9638184 A JP9638184 A JP 9638184A JP 9638184 A JP9638184 A JP 9638184A JP H06103228 B2 JPH06103228 B2 JP H06103228B2
- Authority
- JP
- Japan
- Prior art keywords
- shape memory
- memory alloy
- temperature
- alloy wire
- heated
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
- G01K5/483—Measuring temperature based on the expansion or contraction of a material the material being a solid using materials with a configuration memory, e.g. Ni-Ti alloys
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、温度が所定温度以上になったことを検出する
検出器に係り、特に形状記憶合金線を利用した温度検出
器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detector for detecting a temperature higher than a predetermined temperature, and more particularly to a temperature detector using a shape memory alloy wire. .
（従来技術） 例えば、電気導体の接続部が正常か否かを判別するに
は、その接続部の温度を検出するのが最も確実な方法で
ある。接続部の温度が規定温度より高ければその接続部
は異常であり、低ければ正常と判断できる。(Prior Art) For example, the most reliable method is to detect the temperature of the connection portion in order to determine whether or not the connection portion of the electric conductor is normal. If the temperature of the connection part is higher than the specified temperature, the connection part is abnormal, and if it is low, it can be judged as normal.
しかし、この方法は接続部が通電状態にあるときの温度
を検出しなければならないため、通常の例えばサーミス
タを用いた温度検出器などは使用不可能である。また、
電気導体の接続部の温度は負荷電流の大きさによっても
変化するので、接続部が正常か否かを判断するには、そ
の温度を常時監視しなければならないという問題もあ
る。このため、電力系統などで接続端子の異常温度上昇
を検出したいという要求がありこの問題点を解決する温
度検出器として、特開昭58−43125号のようなものが知
られている。However, since this method needs to detect the temperature when the connection portion is in the energized state, a normal temperature detector using a thermistor cannot be used. Also,
Since the temperature of the connecting portion of the electric conductor changes depending on the magnitude of the load current, there is also a problem that the temperature of the connecting portion must be constantly monitored in order to determine whether or not the connecting portion is normal. For this reason, there is a demand for detecting an abnormal temperature rise of the connection terminal in a power system or the like, and as a temperature detector that solves this problem, there is known a temperature detector such as Japanese Patent Laid-Open No. 58-43125.
しかしながら、上記のものは形状記憶効果を有する金属
部材が露出しており、形状記憶合金（前記金属部材）は
熱伝導率が著しく小さいため電路の接続部等で異常発熱
が発生しても、前記形状記憶合金の形状復帰が完全にな
されずに表示部が最後まで回転しない等、温度上昇の検
出が確実に行えないという問題があった。However, in the above, the metal member having the shape memory effect is exposed, and since the shape memory alloy (the metal member) has a remarkably small thermal conductivity, even if abnormal heat is generated at the connection part of the electric circuit, There is a problem in that the temperature rise cannot be reliably detected, for example, the shape of the shape memory alloy is not completely restored and the display unit does not rotate to the end.
（問題点の解決手段） 本発明は、上記のような従来技術の問題点に鑑み、温度
が所定温度以上になったことを簡単に、かつ確実に検出
できる温度上昇検出器を提供するものである。(Means for Solving Problems) The present invention provides a temperature rise detector capable of easily and reliably detecting that the temperature has reached a predetermined temperature or higher in view of the problems of the above-described conventional techniques. is there.
本発明の温度上昇検出器は、ねじり変形が与えらえた形
状記憶合金線の一端に表示部材を固定し、温度上昇によ
って前記ねじり変形が回復するようにしてなる温度上昇
検出器において、金属製の被加熱体に形成した穴に、形
状記憶合金線を、前記表示部材を除いた形状記憶合金線
の露出部分がほぼなくなるように挿入し、かつその穴の
奥部で形状記憶合金線の他端を被加熱体に固定したこと
を特徴とするものである。The temperature rise detector of the present invention is a temperature rise detector in which a display member is fixed to one end of a shape memory alloy wire to which a torsional deformation has been given, and the torsional deformation is recovered by a temperature increase. The shape memory alloy wire is inserted into the hole formed in the object to be heated so that the exposed portion of the shape memory alloy wire excluding the display member is almost eliminated, and the other end of the shape memory alloy wire is located at the inner part of the hole. Is fixed to the object to be heated.
形状記憶合金は、所定の温度（変態点）以下で記憶形状
以外の形に変形させておくと、その温度以上に加熱され
たときに、記憶形状に回復するという性質を有する。本
発明はこの性質を利用したものである。The shape memory alloy has a property that when it is deformed to a shape other than the memorized shape at a predetermined temperature (transformation point) or lower, it is restored to the memorized shape when heated to the temperature or higher. The present invention utilizes this property.
本発明の温度上昇検出器においては、予め形状記憶合金
線に変態点以下の温度で例えばねじり変形を与えてお
く。このねじりは表示部材を所定角度だけ回転させるこ
とにより与えることができる。この状態で、被加熱体が
加熱されると、その穴の中に収納されている形状記憶合
金線の温度も上昇する。その温度が変態点以上になると
形状記憶合金線は記憶形状（なじられる前の状態）に回
復するから、そのとき表示部材を元の位置まで回転させ
る。したがって表示部材が元の位置にもどっているか否
かを目視で確認すれば、被加熱体が所定の温度以上にな
ったか否かを検出できる。In the temperature rise detector of the present invention, the shape memory alloy wire is preliminarily subjected to, for example, torsional deformation at a temperature below the transformation point. This twist can be applied by rotating the display member by a predetermined angle. When the object to be heated is heated in this state, the temperature of the shape memory alloy wire housed in the hole also rises. When the temperature becomes equal to or higher than the transformation point, the shape memory alloy wire recovers to the memorized shape (state before being touched), and at that time, the display member is rotated to the original position. Therefore, by visually confirming whether or not the display member has returned to the original position, it can be detected whether or not the heated object has reached a predetermined temperature or higher.
形状記憶合金は、普通の金属に比べ熱伝導率が著しく小
さいので、形状記憶合金線が外気中に露出している状態
では、それを被加熱体の熱で効率よく加熱することはで
きない。上記のように形状記憶合金線を被加熱体の穴に
収納しておくことは、形状記憶合金線の加熱効率をよく
し、検出感度を向上させるのに有効である。なお被加熱
体の穴の内壁と形状記憶合金線との間隙はできるだけ小
さくしておくことが好ましく、またその間隙にゼリー状
のシリコーン樹脂、黒鉛粉あるいは油などを詰めておく
ことも、被加熱体から形状記憶合金線への熱伝導性を高
めるのに有効である。Since the shape memory alloy has a remarkably lower thermal conductivity than ordinary metals, it is not possible to efficiently heat the shape memory alloy wire by the heat of the object to be heated when the shape memory alloy wire is exposed to the outside air. As described above, storing the shape memory alloy wire in the hole of the object to be heated is effective for improving the heating efficiency of the shape memory alloy wire and improving the detection sensitivity. It is preferable to keep the gap between the inner wall of the hole of the object to be heated and the shape memory alloy wire as small as possible, and to fill the gap with jelly-like silicone resin, graphite powder or oil. It is effective in increasing the thermal conductivity from the body to the shape memory alloy wire.
被加熱体は熱伝導率のよい銅またはアルミニウムで構成
することが好ましい。The object to be heated is preferably made of copper or aluminum having good thermal conductivity.
この温度上昇検出器は通常、被加熱体を温度検出すべき
対象（例えば接続端子）に取りつけて使用されるが、被
加熱体自体が温度検出すべき対象であってもよい。ま
た、この温度上昇検出器は電気導体の接続部の温度検出
以外にも使用可能であり、特に人が近寄れない個所の温
度検出に好適である。This temperature rise detector is usually used by attaching the object to be heated to an object to be detected in temperature (for example, a connection terminal), but the object to be heated itself may be an object to be detected in temperature. Further, this temperature rise detector can be used in addition to detecting the temperature of the connecting portion of the electric conductor, and is particularly suitable for detecting the temperature of a place where a person cannot approach.
（実施例） 第１図および第２図は本発明の一実施例を示す。符号１
は被加熱体、２は形状記憶合金線、３は表示部材であ
る。被加熱体１は軸部４と取付部５とからなり、取付部
５にはボルト穴６が形成されている。また、軸部４には
その軸線方向に穴７が形成されており、その穴７には形
状記憶合金線２が挿入されている。形状記憶合金線２の
一端は穴７の奥部で被加熱体１に固定されている。８は
その固定部である。形状記憶合金線２の被加熱体１への
固定は、たとえば被加熱体１をかしめることにより行わ
れる。被加熱体１から突出している形状記憶合金線２の
開放端には旗状の表示部材３が固定され、前記形状記憶
合金線２が露出している部分がほぼなくなっている。表
示部材３は通常、プラスチックで作られ、表と裏の色を
異ならせてある。本実施例では、表を白、裏を赤として
おく。(Embodiment) FIGS. 1 and 2 show an embodiment of the present invention. Code 1
Is a heated object, 2 is a shape memory alloy wire, and 3 is a display member. The object to be heated 1 comprises a shaft portion 4 and a mounting portion 5, and a bolt hole 6 is formed in the mounting portion 5. A hole 7 is formed in the shaft portion 4 in the axial direction, and the shape memory alloy wire 2 is inserted into the hole 7. One end of the shape memory alloy wire 2 is fixed to the object to be heated 1 at the inner part of the hole 7. Reference numeral 8 is the fixed part. The shape memory alloy wire 2 is fixed to the heated body 1, for example, by caulking the heated body 1. A flag-shaped display member 3 is fixed to the open end of the shape memory alloy wire 2 protruding from the object to be heated 1, and the exposed portion of the shape memory alloy wire 2 is almost eliminated. The display member 3 is usually made of plastic and has different colors on the front side and the back side. In this embodiment, the front is white and the back is red.
形状記憶合金線２の記憶形状（ねじられていない状態）
は第２図の状態で、表示部材３は赤を表示している。こ
の状態から矢印Ａで示すように、表示部材３を180°回
転させると、第１図に示すように表示部材３は白にな
り、形状記憶合金線２は180°ねじられる。これが温度
検出のセットの状態である。Memory shape of shape memory alloy wire 2 (untwisted state)
In the state of FIG. 2, the display member 3 displays red. When the display member 3 is rotated 180 ° from this state as shown by the arrow A, the display member 3 becomes white and the shape memory alloy wire 2 is twisted 180 ° as shown in FIG. This is the set state of temperature detection.
第３図は、上記のようにセットされた温度上昇検出器10
が羽子板端子11に取りつけられている状態を示す。12は
相手方の機器端子、13は締付け用のボルトである。羽子
板端子11の温度が上昇すると、熱伝導で被加熱体１の温
度が上がり、そこからの熱輻射および熱伝導で形状記憶
合金線２の温度が上昇する。羽子板端子11が規定の温度
以下のときは、表示部材３は白のままであるが、規定の
温度を越えると形状記憶合金線２が記憶形状に回復する
（ねじりのない状態にもどる）ため、表示部材３は矢印
Ｂ方向（第１図参照）に回転し、第２図のようになって
赤を表示する。いったんこの状態になると温度が低下し
ても表示部材３は赤のままである。FIG. 3 shows the temperature rise detector 10 set as described above.
Is attached to the battledore terminal 11. Reference numeral 12 is a counterpart device terminal, and 13 is a tightening bolt. When the temperature of the battledore terminal 11 rises, the temperature of the object 1 to be heated rises due to heat conduction, and the temperature of the shape memory alloy wire 2 rises due to heat radiation and heat conduction therefrom. When the battledore terminal 11 is below the specified temperature, the display member 3 remains white, but when the specified temperature is exceeded, the shape memory alloy wire 2 recovers to the memorized shape (returns to the untwisted state). The display member 3 rotates in the direction of arrow B (see FIG. 1) and displays red as shown in FIG. Once in this state, the display member 3 remains red even if the temperature drops.
したがって羽子板端子11が規定温度以上になったことを
目視確認できるから、羽子板端子11と機器端子12の接続
部の保守点検が的確に行うことができる。同接続部の修
理が終了したならば、表示部材３を矢印Ａ方向に回転し
て第１図の状態にしておけば、再び温度検出が可能であ
る。Therefore, since it can be visually confirmed that the battledore terminal 11 has reached the specified temperature or higher, the maintenance and inspection of the connecting portion between the battledore terminal 11 and the device terminal 12 can be accurately performed. When the repair of the connection portion is completed, the temperature can be detected again if the display member 3 is rotated in the direction of arrow A to be in the state of FIG.
第４図および第５図は本発明の他の実施例を示す。この
温度上昇検出器は、被加熱体１がボルトの形態である。
このボルト形被加熱体１にはその軸線方向に穴が形成さ
れ、その中に形状記憶合金線２が挿入され、それが穴の
奥部（ボルトの先端側）で被加熱体１に固定されてい
る。ボルトの頭部から突出する形状記憶合金線２の開放
端には、ボルトの頭部より一まわり小さい円板状の表示
部材３が固定されている。この円板状表示部材３の表面
は例えば半分が赤、半分が白に塗られている。同様にボ
ルトの頭部も半分が赤半分が白に塗られている。第５図
は表示部材３の赤白とボルト頭部の赤白が反対になって
いる状態を示している。この状態は、表示部材３を180
°回転させて、形状記憶合金線２をねじった状態であ
る。つまりセットの状態である。この状態で、被加熱体
１が加熱され、形状記憶合金線２の温度が変態点を越え
ると、形状記憶合金線２はねじりのない状態にもどって
表示部材３を180°回転させる。これにより表示部材３
の赤白とボルト頭部の赤白が一致するから、被加熱体１
が所定の温度以上になったことを検知できる。4 and 5 show another embodiment of the present invention. In this temperature rise detector, the object to be heated 1 is in the form of a bolt.
A hole is formed in the bolt-shaped heated body 1 in the axial direction thereof, and the shape memory alloy wire 2 is inserted into the hole, which is fixed to the heated body 1 at the inner part of the hole (the tip side of the bolt). ing. At the open end of the shape memory alloy wire 2 protruding from the head of the bolt, a disc-shaped display member 3 which is one size smaller than the head of the bolt is fixed. For example, half of the surface of the disk-shaped display member 3 is painted red and half of the surface is painted white. Similarly, half of the bolt head is painted red and half is painted white. FIG. 5 shows a state in which the red and white of the display member 3 and the red and white of the bolt head are opposite. In this state, the display member 3 is
The shape memory alloy wire 2 is twisted by being rotated by °. In other words, it is a set state. In this state, when the object to be heated 1 is heated and the temperature of the shape memory alloy wire 2 exceeds the transformation point, the shape memory alloy wire 2 returns to the untwisted state and rotates the display member 3 by 180 °. As a result, the display member 3
Since the red and white of the head and the red and white of the bolt head match
It can be detected that the temperature exceeds a predetermined temperature.
（発明の効果） 以上説明したように本発明の温度上昇検出器は、形状記
憶合金の温度による変化で温度上昇の検出を行うもので
あって、形状記憶合金線は被加熱体の穴の中に収納され
前記形状記憶合金線の露出部がほぼなくなっているか
ら、形状記憶合金線への熱供給が効率よく行われ、温度
上昇の検出を確実に行うことができる。(Effect of the invention) As described above, the temperature rise detector of the present invention detects a temperature rise due to a change due to the temperature of the shape memory alloy, and the shape memory alloy wire is inside the hole of the heated object. Since the exposed portion of the shape memory alloy wire stored in the shape memory alloy is almost eliminated, heat can be efficiently supplied to the shape memory alloy wire, and the temperature rise can be reliably detected.
第１図は本発明の一実施例に係る温度上昇検出器の温度
上昇検出前の状態を示す一部切開正面図、第２図は同検
出器の温度上昇検出後の状態を示す一部欠載正面図、第
３図は同検出器の使用状態を示す正面図、第４図および
第５図は本発明の他の実施例を示す正面図および右側面
図である。 １〜被加熱体、２〜形状記憶合金線、３〜表示部材、７
〜穴、８〜固定部。FIG. 1 is a partially cutaway front view showing a state before temperature rise detection of a temperature rise detector according to one embodiment of the present invention, and FIG. 2 is a partial cutaway showing a state after temperature rise detection of the same detector. FIG. 3 is a front view showing the usage state of the same detector, and FIGS. 4 and 5 are a front view and a right side view showing another embodiment of the present invention. 1-To-be-heated object, 2-Shape memory alloy wire, 3-Display member, 7
~ Hole, 8 ~ Fixed part.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−43125（ＪＰ，Ａ) 実開 昭55−105139（ＪＰ，Ｕ) 実開 昭59−121520（ＪＰ，Ｕ) 実開 昭60−31043（ＪＰ，Ｕ) 実開 昭60−66951（ＪＰ，Ｕ) 実開 昭50−93574（ＪＰ，Ｕ) 実公 昭57−13456（ＪＰ，Ｙ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-43125 (JP, A) real-opening Sho-55-105139 (JP, U) real-opening Sho-59-121520 (JP, U) real-opening Sho-60- 31043 (JP, U) Actual opening Sho 60-66951 (JP, U) Actual opening Sho 50-93574 (JP, U) Actual opening Sho 57-13456 (JP, Y2)
Claims (1)
一端に表示部材を固定し、温度上昇によって前記ねじり
変形が回復するようにしてなる温度上昇検出器におい
て、金属製の被加熱体に形成した穴に、形状記憶合金線
を、前記表示部材を除いた形状記憶合金線の露出部分が
ほぼなくなるように挿入し、かつその穴の奥部で形状記
憶合金線の他端を被加熱体に固定したことを特徴とする
温度上昇検出器。1. A temperature rise detector in which a display member is fixed to one end of a shape memory alloy wire to which a torsional deformation has been applied so that the torsional deformation is recovered by a temperature increase. The shape memory alloy wire is inserted into the formed hole so that the exposed portion of the shape memory alloy wire excluding the display member is almost eliminated, and the other end of the shape memory alloy wire is placed at the back of the hole to be heated. Temperature rise detector characterized by being fixed to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9638184A JPH06103228B2 (en) | 1984-05-16 | 1984-05-16 | Temperature rise detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9638184A JPH06103228B2 (en) | 1984-05-16 | 1984-05-16 | Temperature rise detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60242331A JPS60242331A (en) | 1985-12-02 |
| JPH06103228B2 true JPH06103228B2 (en) | 1994-12-14 |
Family
ID=14163380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9638184A Expired - Lifetime JPH06103228B2 (en) | 1984-05-16 | 1984-05-16 | Temperature rise detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06103228B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4812826A (en) * | 1987-03-26 | 1989-03-14 | Carnegie-Mellon University | Thermal sensor for detection of railroad bearing failures |
-
1984
- 1984-05-16 JP JP9638184A patent/JPH06103228B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60242331A (en) | 1985-12-02 |
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