JPS5841703Y2 - fusible link - Google Patents

Description

【考案の詳細な説明】 本考案は、ヒュージブルリンクに関し、更に詳しくはバ
イメタル等の熱歪みが大きな金属を可溶導体とするヒュ
ージブルリンクの改良に関する。[Detailed Description of the Invention] The present invention relates to a fusible link, and more particularly to an improvement in a fusible link in which a fusible conductor is a metal with large thermal distortion, such as a bimetal.

従来のヒュージブルリンクは一般に軟銅撚線より戊る可
溶導体を耐熱性絶縁体で被覆した構成を有する。Conventional fusible links generally have a structure in which a fusible conductor made of stranded annealed copper wire is covered with a heat-resistant insulator.

これは絶縁体の種類や取付方法によって可溶導体にか・
る引張応力、曲げ応力等が異なることにより、回路ショ
ート時の溶断特性に大きなバラツキがある等の欠点があ
った。Depending on the type of insulator and installation method, this may or may not be the case with fusible conductors.
Due to the difference in tensile stress, bending stress, etc., there was a drawback that there was a large variation in the fusing characteristics when a circuit shorted.

この欠点を克服するものとして、実願昭５５−４１４１
３号において、バイメタル等の熱歪みの大なる金属を可
溶導体とするヒュージブルリンクを提案した。To overcome this drawback, the Utility Application No. 55-4141
In No. 3, we proposed a fusible link that uses a metal with large thermal distortion, such as a bimetal, as a fusible conductor.

しかし、このものは可溶導体自体のショート電流による
溶断と熱歪みによる引張応力との同時作用により即断効
果を発揮し、第５図の曲線Ａの如く、シャープな溶断特
性を示す反面、例えばモータ始動時等の瞬間過電流に敏
感に対応して溶断する虞があり、回路の適切な保護とい
う本来の目的を遠戚し得なくなるという問題があった。However, this material exhibits an instant cutting effect due to the simultaneous action of fusing due to the short current of the fusible conductor itself and tensile stress due to thermal distortion, and exhibits sharp fusing characteristics as shown by curve A in Figure 5. This poses a problem in that it responds sensitively to instantaneous overcurrents such as at the time of starting, and there is a risk of melting, which makes it impossible to achieve the original purpose of properly protecting the circuit.

本考案は上記問題を改善するためになされたもので、発
熱溶断特性を変更し、上記瞬間過電流による溶断を防止
するようにしたものである。The present invention was made to improve the above problem, and the heat-generating fusing characteristics are changed to prevent fusing due to the above-mentioned instantaneous overcurrent.

以下、本考案を図面に基いて説明すると、第１図および
第２図において、１はヒュージブルリンクを示し、可溶
導体２の両端に端子３を直交して接続した構成を有する
。Hereinafter, the present invention will be explained based on the drawings. In FIGS. 1 and 2, reference numeral 1 indicates a fusible link, which has a structure in which terminals 3 are connected to both ends of a fusible conductor 2 orthogonally.

可溶導体２はバイメタル等の熱歪みの大なる金属材料よ
り戒り、中間に中挟の発熱溶断部２ａが形成されている
。The fusible conductor 2 is made of a metal material with large thermal distortion such as bimetal, and a heat-generating fusing part 2a is formed in the middle.

この発熱溶断部２ａの巾ｄは回路の定格電流、最大許容
電流等の設定条件により決定する。The width d of the heat-generating fusing portion 2a is determined by setting conditions such as the rated current of the circuit and the maximum allowable current.

４は透明な蓋５を有する合成樹脂製のハウジングで、ヒ
ュージブルリンク１はハウジング４の底部４ａに端子挿
通孔４ｂを設けて嵌挿するか或いはハウジング４と一体
成形により固定する。Reference numeral 4 denotes a synthetic resin housing having a transparent lid 5. The fusible link 1 is either fitted into a terminal insertion hole 4b provided in the bottom 4a of the housing 4, or fixed to the housing 4 by integral molding.

以上は先願と同様の構成であるが、本考案にあっては、
可溶導体２の発熱溶断部２ａと接触して吸熱体６を配置
し、その基底部６ａはハウジング底部４ａに固定する。The above is the same configuration as the previous application, but in the present invention,
A heat absorber 6 is disposed in contact with the heat-generating fusing portion 2a of the fusible conductor 2, and its base portion 6a is fixed to the housing bottom portion 4a.

この吸熱体６は発熱溶断部２ａより十分大きな容量とし
、例えばセラミック、硝子或いは金属材料で構成する。The heat absorbing body 6 has a capacity sufficiently larger than that of the exothermic fusing portion 2a, and is made of, for example, ceramic, glass, or metal material.

上記構成において、モータ起動時等に瞬間過電流が流れ
発熱溶断部２ａが発熱しても、鉄部２ａは吸熱体６と接
触しているため、熱の一部が吸収され、従来の如く直ち
に溶断するようなことがなくなる。In the above configuration, even if an instantaneous overcurrent flows and heats up in the heat-generating fusing part 2a when the motor starts, etc., since the iron part 2a is in contact with the heat absorbing body 6, part of the heat is absorbed, and the heat is immediately absorbed as in the conventional case. No more melting.

また、回路の定格電流よりは大なる溶断範囲での低電流
通電時においては、溶断迄に長時間を要するため発熱溶
断部２ａの熱により可溶導体２が全体的に加熱され、第
３図の如く湾曲し吸熱体６から離れる。In addition, when low current is applied in a fusing range that is larger than the rated current of the circuit, it takes a long time for the fusing to occur, so the fusible conductor 2 is entirely heated by the heat of the heat-generating fusing part 2a, as shown in FIG. It curves and separates from the heat absorbing body 6 as shown in FIG.

従って、この場合には吸熱体６がない状態とほぼ同等の
溶断特性が得られる。Therefore, in this case, almost the same fusing characteristics as in the state without the heat absorber 6 can be obtained.

その結果、ヒュージブルリンク１の溶断特性は第５図の
曲線Ｂの如く瞬間過電流領域が拡大し、適用範囲が広が
る。As a result, in the fusing characteristics of the fusible link 1, the instantaneous overcurrent region is expanded as shown by curve B in FIG. 5, and the range of application is expanded.

即ち、吸熱体６の介在により、瞬間過電流領域での溶断
特性を変化させることができる。That is, the interposition of the heat absorber 6 allows the fusing characteristics in the instantaneous overcurrent region to be changed.

以上は可溶導体２の両端に端子３を一体的に接続固定し
たヒュ・−ジブルリンクについて説明したが、第４図に
示す如く、可溶導体２をそのま・ヒユーズホルダ７の端
子８，８にネジ９により固定して使用することができる
。The above has described a fusible link in which the terminals 3 are integrally connected and fixed to both ends of the fusible conductor 2, but as shown in FIG. It can be used by fixing it with screws 9.

この場合にはヒユーズホルダ７に予め吸熱体６′を設け
ておくようにすればよい。In this case, the fuse holder 7 may be provided with a heat absorbing body 6' in advance.

本考案は上記のように、バイメタル等の熱歪みが大きな
金属導体よりなる可溶導体の中間部に発熱溶断部を形成
すると共に、この発熱溶断部に吸熱体を接触して配置し
て戊るものであるから、瞬間過電流による溶断が防止さ
れ易いヒュージブルリンクを提供することができる。As described above, the present invention forms a heat-generating fusing part in the middle of a fusible conductor made of a metal conductor with large thermal distortion, such as a bimetal, and also arranges a heat absorber in contact with this heat-generating fusing part. Therefore, it is possible to provide a fusible link that is easily prevented from blowing out due to instantaneous overcurrent.

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

第１図は本考案の一実施例を示す斜視図、第２図はその
ハウジングに収容した状態の縦断面図、第３図はその作
用状態の説明図、第４図は他の実施態様を示す要部平面
図、第５図は本考案および従来のヒュージブルリンクの
溶断特性曲線を示すグラフである。 ２・・・・・・可溶導体、２ａ・・・・・・発熱溶断部
、６，６′・・・・・・吸熱体。Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is a vertical sectional view of the device accommodated in its housing, Fig. 3 is an explanatory view of its working state, and Fig. 4 shows another embodiment. FIG. 5 is a graph showing fusing characteristic curves of the fusible link of the present invention and the conventional fusible link. 2... Fusible conductor, 2a... Heat generating fusing part, 6, 6'... Heat absorbing body.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] バイメタル等の熱歪みが大きな金属導体よりなる可溶導
体の中間部に発熱溶断部を形成すると共に、この発熱溶
断部に吸熱体を接触して配置して成ることを特徴とする
ヒュージブルリンク。A fusible link is characterized in that a heat-generating fusing part is formed in the middle of a fusible conductor made of a metal conductor with large thermal distortion such as a bimetal, and a heat absorbing body is placed in contact with the heat-generating fusing part.