JPH04274120A - Thermal protector - Google Patents
Thermal protectorInfo
- Publication number
- JPH04274120A JPH04274120A JP3397591A JP3397591A JPH04274120A JP H04274120 A JPH04274120 A JP H04274120A JP 3397591 A JP3397591 A JP 3397591A JP 3397591 A JP3397591 A JP 3397591A JP H04274120 A JPH04274120 A JP H04274120A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- thermal protector
- electrode
- contact
- fixed electrode
- 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
- 230000001012 protector Effects 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 239000000155 melt Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 5
- 238000013021 overheating Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000012508 resin bead Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910000743 fusible alloy Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
Landscapes
- Thermally Actuated Switches (AREA)
- Fuses (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、熱応動素子を用いるサ
ーマルプロテクタ,とくに周囲の温度の異常過昇時に、
接点間を常時開状態に保ち、過温に対する二重の安全保
護機能をもつサーマルプロテクタに関するものである。[Industrial Application Field] The present invention relates to a thermal protector using a thermally responsive element, especially when the surrounding temperature rises abnormally.
This relates to a thermal protector that keeps the contacts open at all times and has a dual safety protection function against overtemperature.
【0002】0002
【従来の技術】熱応動板を用いるサーマルプロテクタは
、固定電極と可動電極を主要部とする。固定電極は金属
板よりなり、可動電極は熱応動素子よりなり、可動電極
が温度変化により湾曲変形するとき、両電極の一端が接
触離反し両電極につながる電気回路が断続されるように
対向させられ、他端において固定支持されている。両電
極の接触箇所には、多数回の断続に耐えられるように固
定接点・可動接点が取り付けられている。固定電極の金
属板はそのまま他端で樹脂ビードなどの支持手段に植設
されているが、可動電極の方は、金属の可動電極端子に
接続固定されて、この可動電極端子の他端が支持手段に
植設固定されている。これら両電極は容器内に収められ
、固定電極および可動電極端子は支持手段を貫通し、そ
れにリード線が接続されている。2. Description of the Related Art A thermal protector using a thermally responsive plate has a fixed electrode and a movable electrode as main parts. The fixed electrode is made of a metal plate, and the movable electrode is made of a thermally responsive element. When the movable electrode curves and deforms due to a temperature change, the electrodes are arranged so that they face each other so that when the movable electrode is bent and deformed due to a temperature change, one end of both electrodes comes into contact and separates, and the electric circuit connected to both electrodes is interrupted. and is fixedly supported at the other end. A fixed contact and a movable contact are attached to the contact points between both electrodes so that they can withstand multiple interruptions. The other end of the metal plate of the fixed electrode is implanted in a support means such as a resin bead, but the movable electrode is connected and fixed to a metal movable electrode terminal, and the other end of this movable electrode terminal is supported. The means are planted and fixed. Both electrodes are housed in a container, and the fixed electrode and movable electrode terminals pass through the support means to which lead wires are connected.
【0003】サーマルプロテクタは、モータ,蛍光灯安
定器などに取り付けられ、これらの負荷と電気的に直列
に接続され、これら負荷の過熱保護に用いられる。すな
わち、負荷が故障を起こし、温度過昇を起こしたとき、
サーマルプロテクタの接点が開となり、電気回路を開に
する。負荷の温度が下がり、サーマルプロテクタの復帰
温度に至ると、接点が閉となり、また通電する。そして
、負荷の故障原因が取り除かれるか、または電源が切断
されるまで、サーマルプロテクタは開閉を繰返し、負荷
をある一定温度以下に保ち、負荷を異常過温または火災
から保護する。これが、サーマルプロテクタの過温に対
する第1の安全保護機能である。Thermal protectors are attached to motors, fluorescent lamp ballasts, etc., electrically connected in series with these loads, and used to protect these loads from overheating. In other words, when the load fails and the temperature rises,
The thermal protector contacts open, opening the electrical circuit. When the load temperature decreases and reaches the thermal protector's return temperature, the contacts close and the current is turned on again. The thermal protector repeats opening and closing until the cause of the load failure is removed or the power is turned off, keeping the load below a certain temperature and protecting the load from abnormal overheating or fire. This is the thermal protector's primary safety protection against overtemperature.
【0004】0004
【発明が解決しようとする課題】しかし、この故障の除
去または電源の切断が遅れ、サーマルプロテクタが長期
間負荷の開閉を続けると、ついにはサーマルプロテクタ
の開閉耐久回数限界を越え、接点が常時閉状態となり、
負荷が異常過熱し、火災の危険を生じることがある。[Problem to be Solved by the Invention] However, if there is a delay in removing this fault or turning off the power, and the thermal protector continues to open and close the load for a long period of time, the thermal protector's durability limit for opening and closing times will eventually be exceeded, and the contacts will remain closed all the time. state,
The load may overheat and create a fire hazard.
【0005】本発明の目的は、この負荷が異常過熱を起
こした場合に接点を常時開状態にし得るようにして、過
温に対する第2の安全保護機能を付したサーマルプロテ
クタを得ることにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a thermal protector that has a second safety protection function against overheating by allowing the contacts to be kept open when the load abnormally overheats.
【0006】[0006]
【課題を解決するための手段】上記目的を達成するため
、本発明のサーマルプロテクタは、弾性金属板よりなる
固定電極と、熱応動板とよりなる可動電極と、これら両
電極が対向し低温では接触し一定温度以上の高温では熱
応動材料の変形により離反するように両電極を他端で支
持する支持手段と、前記固定電極,前記可動電極、およ
び前記支持手段を収容した容器とよりなり、前記固定電
極の背後に感温可熔体を有し、前記可動電極の変形範囲
に係止手段を有し、前記感温可熔体が前記一定温度以上
の所望の第2の一定温度で熔解し前記固定電極の後退を
可能ならしめ、前記固定電極が後退したとき、前記係止
手段が前記可動電極の前記固定電極への接触を抑止する
ごとくなっているものである。[Means for Solving the Problems] In order to achieve the above object, the thermal protector of the present invention has a fixed electrode made of an elastic metal plate, a movable electrode made of a thermally responsive plate, and these electrodes face each other at low temperatures. comprising a support means for supporting both electrodes at the other end so that they are in contact and separated by deformation of the thermally responsive material at a high temperature above a certain temperature, and a container containing the fixed electrode, the movable electrode, and the support means, A temperature-sensitive meltable body is provided behind the fixed electrode, a locking means is provided in a deformation range of the movable electrode, and the temperature-sensitive meltable body is melted at a desired second constant temperature equal to or higher than the constant temperature. The fixed electrode can be moved back, and when the fixed electrode is moved back, the locking means prevents the movable electrode from coming into contact with the fixed electrode.
【0007】[0007]
【作用】本発明のサーマルプロテクタは、上記のように
構成されているので、負荷の故障による温度過昇時に、
従来と同様に開閉を繰返し、負荷の温度を意図した値以
下に保ち、負荷の過温に対し第1の安全保護機能を果た
し、さらに、万一この負荷の故障の原因が除去されるこ
となく、または電源が切断されることもなく、サーマル
プロテクタが長期間負荷の開閉を続け、ついにはサーマ
ルプロテクタの開閉耐久回数限界を越え両電極が常時閉
状態となり、負荷が異常に過熱し出しても、サーマルプ
ロテクタの周囲温度が感温可熔体の熔融温度に達した時
に、感温可熔体は熔融し、その結果、両電極は常時開状
態となり、負荷を発煙または火災の危険から保護する。
すなわち、負荷の過温に対し、第2の安全保護機能を果
たす。[Operation] Since the thermal protector of the present invention is constructed as described above, when the temperature rises due to a load failure,
It repeats opening and closing in the same way as before, keeps the load temperature below the intended value, fulfills the first safety protection function against overtemperature of the load, and furthermore, in the event that the cause of this load failure is not removed , or the thermal protector continues to open and close the load for a long time without the power being cut off, and eventually the thermal protector exceeds its opening/closing endurance limit and both electrodes become permanently closed, even if the load starts to overheat abnormally. , when the ambient temperature of the thermal protector reaches the melting temperature of the temperature-sensitive fusible body, the temperature-sensitive fusible body melts, so that both electrodes are permanently open, protecting the load from smoke or fire hazards. . That is, it fulfills the second safety protection function against overtemperature of the load.
【0008】[0008]
【実施例】図1に示すように、本発明実施例のサーマル
プロテクタは、弾性金属板1よりなり、一端に固定接点
2を付した固定電極3と、熱応動板4を付した可動接点
5とよりなる可動電極6とを、固定接点2と可動接点5
が接するように、対向配置して構成される。可動電極6
の他端には、可動電極端子7が固着されており、固定電
極他端8と可動電極端子7とが樹脂ビードよりなる支持
手段9で固定されており、固定電極他端8と可動電極端
子7には支持手段9の外側の部分でリード線10を付し
た後、この組立体を容器11の中に収納している。熱応
動板4は膨張係数の異なる2枚の金属をはり合わせたい
わゆるバイメタルである。同様な働きをするトリメタル
でもよい。中央に凹面部を設け、弾性飛越し現象ないし
スナップアクションにより、断と続との状態変化がはっ
きりなるようにする。ここにおいて、さらに固定電極3
の固定接点2の背面と容器11との間に感温可熔体12
を配置する。感温可熔体12は、このサーマルプロテク
タがいかにしても、この電気回路を断たなければならな
い第2の一定温度で熔解する。感温可熔体12としては
、熔融温度を各種に選定できる有機化合物の感温ペレッ
ト、低融点可熔合金などが用いられる。固定電極3は、
平時はその弾性により、感温可熔体12を多少圧迫して
おり、感温可熔体12の熔融後は、後方に反り返るごと
く支持されなければならない。容器11に代わる支持体
を別に設けて、固定電極1とその支持体との間に感温可
熔体12を配置しても同じ効果を発揮する。感温可熔体
12の配置位置は、固定接点2の背面付近で、固定接点
2からの発熱の影響が、可能な範囲で少ない位置を選ぶ
ものとする。また、必要な場合は、固定電極1と感温可
熔体12との間に遮熱体を挿入してもよい。そして、可
動電極6の可動接点5側の端部近辺に段よりなる係止手
段13を設ける。すなわち、容器11の底面中程に係止
手段13を設ける。この係止手段13は、感温可熔体1
2が熔融していない状態では両接点2,5は、確実に導
通するが、感温可熔体12が熔融し、固定電極3がその
弾性により開いた後は両接点2,5が確実に開状態にな
る位置関係に設定する。その上で、樹脂フィラー14で
封止固着する。感温可熔体13の熔融温度は、サーマル
プロテクタが如何にしても断路しなければならない第2
の温度である。[Embodiment] As shown in FIG. 1, a thermal protector according to an embodiment of the present invention consists of an elastic metal plate 1, a fixed electrode 3 having a fixed contact 2 attached to one end, and a movable contact 5 having a thermally responsive plate 4 attached. A movable electrode 6 consisting of a fixed contact 2 and a movable contact 5
They are arranged facing each other so that they are in contact with each other. Movable electrode 6
A movable electrode terminal 7 is fixed to the other end, and the other end 8 of the fixed electrode and the movable electrode terminal 7 are fixed by support means 9 made of a resin bead, and the other end 8 of the fixed electrode and the movable electrode terminal A lead wire 10 is attached to the support means 9 on the outer side of the support means 9, and then the assembly is housed in a container 11. The thermally responsive plate 4 is a so-called bimetal made by gluing together two metal sheets having different coefficients of expansion. A trimetal that has a similar function may also be used. A concave portion is provided in the center so that the change in state between discontinuation and continuation becomes clear due to the elastic jump phenomenon or snap action. Here, the fixed electrode 3
A temperature-sensitive fusible material 12 is placed between the back surface of the fixed contact 2 and the container 11.
Place. The thermosensitive fusible body 12 melts at a second constant temperature at which the thermal protector must break the electrical circuit in any way. As the temperature-sensitive fusible body 12, temperature-sensitive pellets of organic compounds whose melting temperatures can be selected from various types, low-melting point fusible alloys, etc. are used. The fixed electrode 3 is
At normal times, the temperature-sensitive fusible body 12 is somewhat compressed due to its elasticity, and after the temperature-sensitive fusible body 12 is melted, it must be supported so as to curve backward. The same effect can be obtained by separately providing a support instead of the container 11 and arranging the temperature-sensitive fusible body 12 between the fixed electrode 1 and the support. The temperature-sensitive fusible body 12 is arranged at a position near the back surface of the fixed contact 2 where the influence of heat generated from the fixed contact 2 is as small as possible. Further, if necessary, a heat shield may be inserted between the fixed electrode 1 and the temperature-sensitive fusible body 12. A locking means 13 consisting of a step is provided near the end of the movable electrode 6 on the movable contact 5 side. That is, the locking means 13 is provided in the middle of the bottom surface of the container 11. This locking means 13
2 is not melted, both contacts 2 and 5 are reliably electrically connected, but after the temperature-sensitive meltable body 12 is melted and the fixed electrode 3 is opened due to its elasticity, both contacts 2 and 5 are reliably electrically connected. Set the position so that it is in the open state. Then, it is sealed and fixed with a resin filler 14. The melting temperature of the temperature-sensitive fusible body 13 is the second temperature that the thermal protector must be disconnected from in any case.
temperature.
【0009】[0009]
【発明の効果】本発明のサーマルプロテクタが、従来の
ものと同様に、モータ,蛍光灯安定器等の負荷に取付け
られ、負荷の故障による温度過昇時に接点の開閉を繰返
し、負荷の温度をある一定の値以下に制限し、負荷を保
護することは勿論である。さらに、万一この負荷の故障
の原因を除去することなく、または電源を切断すること
もなく、サーマルプロクタが負荷を長期間開閉し続け、
ついには可動電極の開閉耐久回数限界を越えて、両電極
が常時閉状態になって、負荷が異常に過熱し出した場合
でも、サーマルプロテクタの周囲温度が感温可熔体の熔
融温度に達した時、感温可熔体が熔融し、固定電極3は
、自らの弾性により反り返って可動電極6と離れぬよう
になる。そして可動電極6の方は、係止手段13によっ
て止められて固定電極3に接近することができない。
その結果、両電極は常時開状態となり、負荷を発煙また
は火災の危険から保護する。また、感温可熔体の熔融温
度の選定によっては負荷の機能を重大に損なうことなく
保護することも可能である。さらに、感温可熔体として
は、小型で、安価なものが入手可能であり、従来のサー
マルプロテクタの形状や大きさを大幅に変えずに、安価
に、負荷の過温に対する二重安全保護機能をもつサーマ
ルプロテクタを実現できる。[Effects of the Invention] The thermal protector of the present invention is attached to a load such as a motor or a fluorescent lamp ballast in the same way as conventional ones, and when the temperature rises due to a failure of the load, the contacts are repeatedly opened and closed to reduce the temperature of the load. Of course, it is necessary to protect the load by limiting it to a certain value or less. Furthermore, in the unlikely event that the thermal proctor continues to open and close the load for an extended period of time without eliminating the cause of this load failure or disconnecting the power supply,
Even if the movable electrode's durability limit for opening and closing is exceeded and both electrodes become permanently closed and the load begins to overheat abnormally, the ambient temperature of the thermal protector will reach the melting temperature of the thermosensitive fusible material. At this time, the temperature-sensitive meltable body melts, and the fixed electrode 3 is warped by its own elasticity so that it does not separate from the movable electrode 6. The movable electrode 6 is stopped by the locking means 13 and cannot approach the fixed electrode 3. As a result, both electrodes are permanently open, protecting the load from smoke or fire hazards. Further, depending on the selection of the melting temperature of the temperature-sensitive fusible material, it is possible to protect the load without seriously impairing its function. Furthermore, small and inexpensive temperature-sensitive fusible materials are available, and double safety protection against overheating of the load can be achieved at low cost without significantly changing the shape or size of conventional thermal protectors. A functional thermal protector can be realized.
【図1】本発明の一実施例のサーマルプロテクタの縦断
面図[Fig. 1] A vertical cross-sectional view of a thermal protector according to an embodiment of the present invention.
【図2】同サーマルプロテクタにおいて感温可熔体が熔
融した後の状態を示す縦断面図[Fig. 2] A vertical cross-sectional view showing the state after the temperature-sensitive fusible material is melted in the same thermal protector.
1 弾性金属板 2 固定接点 3 固定電極 4 熱応動板 5 可動接点 6 可動電極 9 支持手段 11 容器 12 感温可熔体 13 係止手段 1 Elastic metal plate 2 Fixed contact 3 Fixed electrode 4 Thermal response plate 5. Movable contact 6. Movable electrode 9 Support means 11 Container 12 Temperature-sensitive meltable material 13 Locking means
Claims (1)
よりなる可動電極と、これら両電極が対向し低温では接
触し一定温度以上の高温では熱応動材料の変形により離
反するように両電極を他端で支持した支持手段と、前記
固定電極,前記可動電極および前記支持手段を収容した
容器とよりなるサーマルプロテクタであって、前記固定
電極の背後に感温可熔体を有し、前記可動電極の変形範
囲に係止手段を有し、前記感温可熔体が前記一定温度以
上の所望の第2の一定温度で熔解し前記固定電極の後退
を可能ならしめ、前記固定電極が後退したとき、前記係
止手段が前記可動電極の前記固定電極への接触を抑止す
るごとくなっていることを特徴とするサーマルプロテク
タ。Claim 1: A fixed electrode made of an elastic metal plate and a movable electrode made of a thermally responsive plate; these electrodes face each other at low temperatures, and at high temperatures above a certain temperature, they separate due to deformation of the thermally responsive material. A thermal protector comprising a support means supporting an electrode at the other end, and a container housing the fixed electrode, the movable electrode, and the support means, the thermal protector having a temperature-sensitive fusible body behind the fixed electrode, A locking means is provided in a deformation range of the movable electrode, and the temperature-sensitive meltable body melts at a desired second constant temperature equal to or higher than the constant temperature to enable the fixed electrode to retreat; A thermal protector characterized in that, when the thermal protector is moved backward, the locking means prevents the movable electrode from coming into contact with the fixed electrode.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3397591A JPH04274120A (en) | 1991-02-28 | 1991-02-28 | Thermal protector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3397591A JPH04274120A (en) | 1991-02-28 | 1991-02-28 | Thermal protector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04274120A true JPH04274120A (en) | 1992-09-30 |
Family
ID=12401492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3397591A Pending JPH04274120A (en) | 1991-02-28 | 1991-02-28 | Thermal protector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04274120A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100351976C (en) * | 2004-09-07 | 2007-11-28 | 游聪谋 | Protector of inductive circuit with dual-temperature |
US7639112B2 (en) * | 2007-04-25 | 2009-12-29 | Sony Corporation | Fuse device with integrated switch |
-
1991
- 1991-02-28 JP JP3397591A patent/JPH04274120A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100351976C (en) * | 2004-09-07 | 2007-11-28 | 游聪谋 | Protector of inductive circuit with dual-temperature |
US7639112B2 (en) * | 2007-04-25 | 2009-12-29 | Sony Corporation | Fuse device with integrated switch |
US7965168B2 (en) | 2007-04-25 | 2011-06-21 | Sony Corporation | Fuse device with integrated switch |
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