JP4147344B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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Publication number
JP4147344B2
JP4147344B2 JP2002235890A JP2002235890A JP4147344B2 JP 4147344 B2 JP4147344 B2 JP 4147344B2 JP 2002235890 A JP2002235890 A JP 2002235890A JP 2002235890 A JP2002235890 A JP 2002235890A JP 4147344 B2 JP4147344 B2 JP 4147344B2
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contact
movable contact
arm
movable
spring
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JP2004079284A (en
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朗史 佐藤
康弘 高橋
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Fuji Electric FA Components and Systems Co Ltd
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Fuji Electric FA Components and Systems Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring

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Description

【０００１】
【発明の属する技術分野】
本発明は、配線用しゃ断器を対象とした回路しゃ断器に関し、詳しくはその電流しゃ断部の構造に関する。
【０００２】
【従来の技術】
頭記の配線用回路しゃ断器として、その電流しゃ断部に回動式の接触子ホルダで保持した橋絡形可動接触子を採用し、過電流の通電時に固定接触子と可動接触子との間に働く電磁反発力を駆動力として可動接触子を開極させるようにした２接点切り方式の回路しゃ断器が特開平６−２８９６４号公報などに開示されて公知である。
【０００３】
また、前記した回路しゃ断器の電流しゃ断部に関して、回動式の接触子ホルダに装着した可動接触子の接圧ばね（閉極位置で可動接点と固定接触子の接点との間に所定の接触圧力を与えるばね）として、ダブルトーション形の捩じりコイルばねを採用した構成のものが、本発明と同一出願人より特願２００１−１５８０４９号として提案されており、次にその電流しゃ断部の構造を図４に示す。
【０００４】
図４(a) 〜(c) において、１は電流しゃ断部の絶縁ケース、２，３は絶縁ケース１に内装してその対角上に配置した電源側および負荷側の固定接触子、４は固定接触子２と３の間を橋絡する一方の腕部および他方の腕部を有する可動接触子、４ａは固定接触子２，３の接点に対峙して可動接触子４の一方の腕部および他方の腕部にそれぞれ設けた可動接点、５は可動接触子４を後記のように接圧ばねと組合せて搭載保持した回転ドラム形の接触子ホルダ、６は消弧装置（グリッド）であり、可動接触子４は接触子ホルダ５の胴内に形成した空所５ａを直径方向に貫通するよう嵌挿した上で、該可動接触子４の接圧ばねとして可動接触子を挟んでその上下両側（可動接触子４の回転中心Ｏに対して軸対称な偏芯位置）に一対のダブルトーション形の捩じりコイルばね（以下「ダブルトーションばね」と呼称する）７を介装し、このダブルトーションばね７のばね力で可動接触子４を回転中心Ｏの回りで閉極方向（反時計方向）に付勢するようにしている。なお、接触子ホルダ５は回路しゃ断器の開閉機構に連係されており、ハンドル操作および過電流引外し動作に連動して接触子ホルダ５が回動する。
【０００５】
また、固定接触子２，３はその先端側部分をＵ字状に折り返し、主回路に大きな過電流（短絡電流）が流れた際に、固定接触子２，３と可動接触子４との間に働く電磁反発力を利用して回路しゃ断器の過負荷引外し装置（図示せず）が作動する以前に可動接触子４をいち早く開極方向に駆動して限流しゃ断を行うようにしており、さらに固定接触子２，３のＵ字折り返し部分には磁性ヨーク８を配して、電流しゃ断時に固定／可動接触子の接点間に発生したアークに作用する磁場を強めて消弧装置６への電磁駆動力を強めるようにしている。
【０００６】
ここで、接触子ホルダ５に搭載した可動接触子４の支持構造について更に詳しく述べると、接圧ばねとして可動接触子４の上下両側に配したダブルトーションばね７は、図４(c) で示すようにコイル両端から引き出した脚７ａを接触子ホルダ５に係止し、コイル中央部分にはコ字形に屈曲して側方に突き出すオフセットアーム７ｂを形成した構造になり、該オフセットアーム７ｂが可動接触子４の背面（可動接点４ａと反対側の面）を跨ぐようにして架設して接触子ホルダ５との間に撓み状態で介装し、この位置でオフセットアーム７ｂの先端を可動接触子４の背面に押し当てて閉極方向へ押圧するようにしている。なお、可動接触子４の上側に配したダブルトーションばね７はそのオフセットアーム７ｂが可動接触子４の長手方向に沿った上面に当接し、下側に配したダブルトーションばねはオフセットアームが可動接触子４の下面側に当接して可動接触子４に偶力を加えるようにしている。これにより、可動接触子４は接触子ホルダ５に対して回動可能に保持されるとともに、その回転中心Ｏの回りで反時計方向にばね付勢され、図４(b) に示す閉極位置で固定接触子２，３に加圧接触している。
【０００７】
この状態で、主回路に過電流（短絡電流）が流れると、固定接触子２，３と可動接触子４との間に電磁反発力が発生し、この電磁反発力により可動接触子４が開極動作してダブルトーションばね７に抗して図４(b) に鎖線で表した開極位置に移動する。これにより、固定／可動接触子間に発生したアークは引き伸ばされてアーク電圧が上昇し、このアーク電圧の上昇により過電流が限流され、電流ゼロ点でアークが消滅してしゃ断に至るとともに、続く過電流引外し装置の動作により開閉機構を介して接触子ホルダ５を時計方向に回動してしゃ断動作が完了する。
【０００８】
【発明が解決しようとする課題】
ところで、前記のように過電流（短絡電流）が流れた際に、引外し装置の動作に先立ち、固定接触子と可動接触子との間に作用する電磁反発力で可動接触子を開極位置駆動して限流しゃ断する回路しゃ断器では、開極動作時に接点間に生じたアークの膠着を抑えてその限流効果を高めるには、可動接触子４の開極速度をできるだけ速めることが必要であるが、接圧ばねであるダブルトーションばね７のばね力が可動接触子の開極動作に対して負荷力として働くために、可動接触子４の開極速度が減速される。
【０００９】
かかる点、従来構造では図５，図６で示すようにダブルトーションばね７のコイル中央から前方に引き出したオフセットアーム７ｂの先端がそのまま可動接触子４の長手方向と平行な背面４ｂに当接し、その当接点（力点）が可動接触子４の開極動作に合わせて背面上を摺動しながら前方に相対移動する。このために、ダブルトーションばね７の撓み角度（捩じれ角度）αは可動接触子４の開極角度と略同じになり、図示例では図６に示す最大開極位置ではダブルトーションばね７の撓み角度αは４０°にも達する。しかも、ダブルトーションばね７のばね特性として、撓み角αが大きくなるほど可動接触子４を閉極方向に付勢するばね力（負荷力）も大きくなることから、可動接触子４はこのばね力を受けて開極速度が大きく減速して回路しゃ断器のしゃ断特性を低下させる。
【００１０】
本発明は上記の点に鑑みなされたものであり、前記構成の電流しゃ断部を装備した回路しゃ断器を対象に、過電流による電磁反発力を受けて可動接触子が開極動作する際に、その開極速度を減速させる負荷力を低減して限流効果を向上させるように接圧ばねの取付け構造を改良した回路しゃ断器を提供することを目的とする。
【００１１】
【課題を解決するための手段】
上記目的を達成するために、本発明によれば、一端に可動接点を設けた一方の腕部および他端に可動接点を設けた他方の腕部を有する可動接触子を接圧ばねと組合せて回転ドラム形の接触子ホルダに保持し、過電流が流れた際に固定接触子と可動接触子との間に働く電磁反発力を駆動力として可動接触子を開極させるとともに、前記接圧ばねを可動接触子の回転中心と偏芯して前記可動接触子の一方の腕部および他方の腕部の背面側にそれぞれ配したダブルトーション形の捩じりコイルばねとし、そのコイル両端から引き出した脚を接触子ホルダに係止させ、コイル中央から引き出したオフセットアームを可動接触子の一方の腕部および他方の腕部の背面にそれぞれ架け渡して可動接触子を閉極方向にばね付勢するようにした２接点切り方式の回路遮断器において、
（１）第１の発明では、前記可動接触子の一方の腕部および他方の腕部の背面にそれぞれ前下がり勾配をもつテーパ面部を形成した上で、そのテーパ面に前記接圧ばねのオフセットアームを押し当てて可動接触子をばね付勢するようにする（請求項１）。
【００１２】
この構成によれば、可動接触子の開極動作に合わせてダブルトーションばねのオフセットアームの当接点は、前記テーパ面に沿って前方に相対移動することになる。しかも、このテーパ面は前下がり勾配であることから、ダブルトーションばねの撓み角度は図５，図６に示した従来構造と比べて小さくなり、これにより可動接触子の開極動作を妨げる抵抗力が低減する。
【００１３】
（２）また、第２は発明では、前記可動接触子の回転中心と一方の腕部の可動接点との間であって、かつ一方の腕部の側面と、前記可動接触子の回転中心と他方の腕部の可動接点との間であって、かつ他方の腕部の側面にそれぞればね受けピンを設けた上で、該ピンに接圧ばねのオフセットアームを押し当てるようにし、かつ該オフセットアームは、その先端部を可動接触子の開極動作に伴う前記ばね受けピンの移動軌跡から後退する向きに屈曲形成するものとする（請求項２）。
上記の構成において、可動接触子の閉極位置では、接圧ばねのオフセットアームの根元側が可動接触子のばね受けピンに当接して可動／固定接点間に接触圧力を加える。これに対して、可動接触子が開極動作すると、オフセットアームとばね受けピンとの当接点（力点）がオフセットアームの先端側に移動するが、前記のようにオフセットアームの先端部はばね受けピンの移動軌跡から後退する向きに屈曲形成されているために、接圧ばねの撓み角度は従来構造と比べて縮小し、その結果として可動接触子の開極動作を妨げる接圧ばねの抵抗力が低減する。
【００１４】
さらに、本発明によれば、第２の発明の実施態様として、接圧ばねのオフセットアーム先端部の曲げ角度を、電磁反発力により開極動作した可動接触子をその開極位置に押圧付勢するような角度に屈曲形成し、開極動作時には接圧ばねのばね力で可動接触子を開極位置に保持して不要な再投入を防ぐようにすることができる（請求項３）。
【００１５】
【発明の実施の形態】
以下、本発明の実施の形態を図１(a),(b) 、および図２，図３に示す実施例に基づいて説明する。なお、各実施例の図中で図５，図６に対応する部材には同一符号を付してその詳細な説明は省略する。
〔実施例１〕
図１(a),(b) は本発明の請求項１に対応する実施例を示すものである。この実施例は基本的に図５，図６に示した従来構造と同様であり、接触子ホルダ５の空所内に内装して可動接触子４の背面側に介装した接圧ばねとしてのダブルトーションばね（捩じりコイルばね）７については、そのコイル部中央から前方に引き出したオフセットアーム７ｂを可動接触子４の背面に押し当てるようにしている。ここで、図示実施例では、可動接触子４の背面に前下がり勾配をもつテーパ面４ｃを形成した上で、そのテーパ面４ｃにダブルトーションばね７のオフセットアーム７ｂの先端を押し当てて可動接触子４を閉極方向にばね付勢するようにしており、図示実施例ではテーパ面４ｃのテーパ角度θ（可動接触子４の背面に対するテーパ面４ｃの相対角度）を３５°に設定している。
【００１６】
上記の構成で、図１(a) の閉極状態では、可動接触子４に対してダブルトーションばね７のオフセットアーム７ｂの先端が前記テーパ面４ｃの面上に当接して可動接触子４の接点に接触圧力を加えている。この状態から、過電流（短絡電流）による電磁反発力Ｆを受けて可動接触子４が開極動作すると、ダブルトーションばね７のオフセットアーム７ｂはテーパ面４ｃを摺動しながら前方に相対移動し、図１(b) に示す可動接触子４の最大開極位置ではオフセットアーム７ｂの当接点がテーパ面４ｃの前端に移るが、この開極動作に伴うダブルトーションばね７の撓み角度α＝２９°であり、図６に示した従来の撓み角度α＝４０°に比べて縮減している。これにより、可動接触子４の開極速度を減速させる接圧ばねの抵抗力が低減して限流しゃ断効果が向上する。
【００１７】
〔実施例２〕
図２および図３は本発明の請求項２，３に対応する実施例を示すものである。この実施例においては、可動接触子４に対してその回転中心Ｏと先端の中間部位に接触子片を貫通して左右側面に突き出したばね受けピン９が新たに設けてある。一方、接圧ばねとして接触子ホルダ５に搭載したダブルトーションばね７は、先記実施例１と逆に可動接触子４の下面側（背面と反対側）に偏芯配置した上で、そのオフセットアーム７ｂが可動接触子４の左右側面を横切って背面側に掛け渡すように配備されている。また、コイル部中央から前方に引き出したオフセットアーム７ｂの長手方向の中間部位７ｂ-1を「く」字形に屈曲し、その先端部が可動接触子４の回転中心Ｏに対する前記ばね受けピン９の移動軌跡Ｐから内側に後退するように形成している。
【００１８】
上記の構成により、図２(a),(b) に示す可動接触子４の閉極状態では、前記ばね受けピン９に対してダブルトーションばね７はオフセットアーム７ａの中間屈曲点より根元側の部分が当接して可動接触子４を閉極方向にばね付勢している。一方、過電流による電磁反発力Ｆを受けて可動接触子４が開極動作すると、その動作過程でばね受けピン９が可動接触子４とともに移動軌跡Ｐに沿って回動し、この動きに伴いダブルトーションばね７のオフセットアーム７ｂとの当接点も先端側に移動する。そして、ばね受けピン９との当接点（力点）がオフセットアーム７ｂの中間屈曲点を越えて先端部側の領域に移行すると、ばね受けピン９に作用するダブルトーションばね７のばね力の向き（ベクトル）が変わり、その屈曲角度によりばね受けピン９を介して可動接触子４を開極位置に保持するように働く。なお、図示例では、可動接触子４の閉極位置から最大開極位置への移動に対応するダブルトーションばね７の撓み角度αは、図６に示した従来構造では撓み角度α＝４０°に対して僅か１４°に縮減する。
【００１９】
つまり、可動接触子４の開極動作過程で、ある程度開極してばね受けピン９がダブルトーションばね７のオフセットアーム７ｂの中間屈曲点を越えると、可動接触子４の開極動作を妨げる方向に働く接圧ばねの負荷力が急激に低減する。これにより可動接触子４の開極速度の減速が抑えられて高い限流しゃ断効果を発揮きる。しかも、図３のように開極位置に到達した可動接触子４をダブルトーションばね７のばね力で開極位置に保持するようオフセットアーム７ｂの屈曲角度を設定しておけば、開極動作した可動接触子４が電流しゃ断部のケース１（図４(b) 参照）の壁面に突き当たり、その反動で閉極位置に反転して接点が再投入するといったトラブルを回避してしゃ断動作の信頼性を高めることができる。
【００２０】
なお、開極位置に押圧保持されている可動接触子４は、トリップ動作後に行う回路しゃ断器のリセット操作で接触子ホルダ５を時計方向に回動させることにより、ダブルトーションばね７のオフセットアーム７ｂとばね受けピン９との当接点がオフセットアームの根元側に移行し、これにより可動接触子４が閉極位置に復帰する。
【００２１】
【発明の効果】
以上述べたように、本発明の構成により次記の効果を奏する。
すなわち、一端に可動接点を設けた一方の腕部および他端に可動接点を設けた他方の腕部を有する可動接触子を接圧ばねと組合せて回転ドラム形の接触子ホルダに保持し、過電流が流れた際に固定接触子と可動接触子との間に働く電磁反発力を駆動力として可動接触子を開極させるとともに、前記接圧ばねを可動接触子の回転中心と偏芯して前記可動接触子の一方の腕部および他方の腕部の背面側にそれぞれ配したダブルトーション形の捩じりコイルばねとし、そのコイル両端から引き出した脚を接触子ホルダに係止させ、コイル中央から引き出したオフセットアームを可動接触子の一方の腕部および他方の腕部の背面にそれぞれ架け渡して可動接触子を閉極方向にばね付勢するようにした２接点切り方式の回路遮断器において、
（１）前記可動接触子の一方の腕部および他方の腕部の背面にそれぞれ前下がり勾配をもつテーパ面部を形成した上で、そのテーパ面に前記接圧ばねのオフセットアームを押し当てて可動接触子をばね付勢するようにした請求項１の構成によれば、可動接触子の開極動作に伴うダブルトーションばねの撓み角度は従来構造と比べて小さくなり、これにより可動接触子の開極速度を減速する抵抗力が低減して限流しゃ断効果が向上する。
【００２２】
（２）また、前記可動接触子の回転中心と一方の腕部の可動接点との間であって、かつ一方の腕部の側面と、前記可動接触子の回転中心と他方の腕部の可動接点との間であって、かつ他方の腕部の側面にそれぞればね受けピンを設けた上で、該ピンに接圧ばねのオフセットアームを押し当てるようにし、かつ該オフセットアームは、その先端部を可動接触子の開極動作に伴う前記ばね受けピンの移動軌跡から後退する向きに屈曲形成するようにした請求項２の構成によれば、可動接触子の開極動作に伴う接圧ばねの撓み角度は従来構造と比べて縮小し、前項(1) と同様に限流しゃ断効果の向上化が図れる。
【００２３】
(3) さらに、前項(2) の構成において、接圧ばねのオフセットアーム先端部の曲げ角度を、電磁反発力により開極動作した可動接触子をその開極位置に押圧付勢するような角度に屈曲形成した請求項３の構成により、開極動作時には接圧ばねのばね力で可動接触子を開極位置に保持して不要な再投入を防ぐことができてしゃ断動作の信頼性が向上する。
【図面の簡単な説明】
【図１】本発明の実施例１に対応する電流しゃ断部の構成図で、(a),(b) はそれぞれ閉極，およ開極動作の状態を表す側面図
【図２】本発明の実施例２に対応する電流しゃ断部の構成図で、(a),(b) は閉極状態を表す側面図，および可動接触子，接圧ばね部分の平面図
【図３】図２の実施例に対応する開極状態を表す側面図
【図４】本発明の実施対象となる回路しゃ断器の電流しゃ断部の従来構成図であり、(a) は一部切欠平面図、(b) は内部構造を表す側面図、(c) は接触子ホルダに可動接触子，接圧ばねを搭載した組立構造を表す外観斜視図
【図５】図４における主要部の構成図で、(a),(b) はそれぞれ可動接触子の閉極状態を表す側面図，および接圧ばねと組合せた可動接触子の平面図
【図６】図５(a) に対応する可動接触子の開極動作状態を表す側面図
【符号の説明】
２，３ 固定接触子
４ 可動接触子
４ａ 可動接点
４ｂ 背面
５ 接触子ホルダ
７ ダブルトーションばね（接圧ばね）
７ａ 脚
７ｂ オフセットアーム
７ｃ 中間屈曲点
９ テーパ面
Ｏ 可動接触子の回転中心[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker intended for a wiring breaker, and more particularly to the structure of a current breaker.
[0002]
[Prior art]
As the circuit breaker for wiring mentioned above, a bridged movable contact held by a rotating contact holder is adopted for the current interrupting part, and between the fixed contact and the movable contact when overcurrent is applied. A two-contact circuit breaker that opens a movable contact by using an electromagnetic repulsive force acting on the motor as a driving force is disclosed in Japanese Patent Laid-Open No. Hei 6-28964.
[0003]
In addition, with respect to the current interrupting portion of the circuit breaker described above, the contact pressure spring of the movable contact mounted on the rotary contact holder (predetermined contact between the movable contact and the contact of the fixed contact at the closed position) A spring using a torsion coil spring of a double torsion type is proposed as Japanese Patent Application No. 2001-158049 by the same applicant as the present invention. the structure shown in FIG.
[0004]
4 (a) to 4 (c), 1 is an insulation case of a current interrupting part, 2 and 3 are power contact side and load side fixed contacts which are arranged in the insulation case 1 and are diagonally arranged. one arm bridging between the fixed contact 2 and 3 and the movable contactor with the other arm portion, 4a is one arm of the movable contact 4 so as to face the contact point of the fixed contacts 2 and 3 A movable contact 5 provided on each of the other arms , 5 is a rotary drum-type contact holder in which the movable contact 4 is mounted and held in combination with a contact pressure spring as described later, and 6 is an arc extinguishing device (grid). The movable contact 4 is inserted into a space 5a formed in the body of the contact holder 5 so as to penetrate in the diameter direction, and the movable contact 4 is sandwiched between the movable contact 4 as a contact pressure spring. A pair of double torsion type on both sides (eccentric position axisymmetric with respect to the rotation center O of the movable contact 4) A torsion coil spring (hereinafter referred to as “double torsion spring”) 7 is interposed, and the spring force of the double torsion spring 7 causes the movable contact 4 to close around the rotation center O (counterclockwise). I am trying to be energized. The contact holder 5 is linked to an opening / closing mechanism of the circuit breaker, and the contact holder 5 rotates in conjunction with the handle operation and the overcurrent tripping operation.
[0005]
The fixed contacts 2 and 3 are folded back in a U shape at the tip side, and when a large overcurrent (short-circuit current) flows through the main circuit, the fixed contacts 2 and 3 and the movable contact 4 Before the circuit breaker overload trip device (not shown) is activated using the electromagnetic repulsive force, the movable contactor 4 is quickly driven in the opening direction to perform the current limiting interruption. Further, a magnetic yoke 8 is arranged at the U-shaped folded portion of the fixed contacts 2 and 3 to strengthen the magnetic field acting on the arc generated between the contacts of the fixed / movable contact when the current is interrupted, and to the arc extinguishing device 6. The electromagnetic driving force is strengthened.
[0006]
Here, the support structure of the movable contact 4 mounted on the contact holder 5 will be described in more detail. The double torsion springs 7 disposed on the upper and lower sides of the movable contact 4 as contact pressure springs are shown in FIG. 4 (c). In this way, the leg 7a pulled out from both ends of the coil is locked to the contact holder 5, and an offset arm 7b that is bent in a U-shape and protrudes to the side is formed at the center of the coil, and the offset arm 7b is movable. It is constructed so as to straddle the back surface (surface opposite to the movable contact 4a) of the contact 4 and is interposed between the contact holder 5 in a bent state, and the tip of the offset arm 7b is moved at this position to the movable contact. 4 is pressed against the back surface of 4 to press in the closing direction. The double torsion spring 7 disposed on the upper side of the movable contact 4 has its offset arm 7b in contact with the upper surface along the longitudinal direction of the movable contact 4, and the double torsion spring disposed on the lower side has a movable contact with the offset arm. A couple of force is applied to the movable contact 4 by contacting the lower surface of the child 4. As a result, the movable contact 4 is rotatably held with respect to the contact holder 5 and is spring-biased counterclockwise around its rotation center O, so that the closed position shown in FIG. In pressure contact with the stationary contacts 2 and 3.
[0007]
In this state, when an overcurrent (short-circuit current) flows in the main circuit, an electromagnetic repulsive force is generated between the stationary contacts 2 and 3 and the movable contact 4, and the movable contact 4 is opened by the electromagnetic repulsive force. The pole moves and moves to the opening position shown by the chain line in FIG. As a result, the arc generated between the fixed / movable contacts is stretched and the arc voltage rises, the overcurrent is limited by the increase of the arc voltage, the arc disappears at the current zero point, and the interruption occurs. By the operation of the subsequent overcurrent tripping device, the contact holder 5 is rotated clockwise through the opening / closing mechanism to complete the cutting operation.
[0008]
[Problems to be solved by the invention]
By the way, when an overcurrent (short-circuit current) flows as described above, the movable contact is opened by an electromagnetic repulsive force acting between the fixed contact and the movable contact prior to the operation of the trip device. In a circuit breaker that drives and limits current limiting, it is necessary to increase the opening speed of the movable contact 4 as much as possible in order to suppress arc sticking between the contacts during the opening operation and enhance the current limiting effect. However, since the spring force of the double torsion spring 7 which is a contact pressure spring acts as a load force on the opening operation of the movable contact, the opening speed of the movable contact 4 is reduced.
[0009]
In this respect, in the conventional structure, as shown in FIGS. 5 and 6, the tip of the offset arm 7 b drawn forward from the coil center of the double torsion spring 7 directly contacts the back surface 4 b parallel to the longitudinal direction of the movable contact 4. The contact point (power point) relatively moves forward while sliding on the back surface in accordance with the opening operation of the movable contact 4. For this purpose, the deflection angle (twist angle) alpha double torsion spring 7 becomes substantially equal to the opening angle of the movable contact 4 the same, the deflection of the double torsion spring 7 at the maximum opening position shown in FIG. 6 in the illustrated example the angle α reaches 40 °. Moreover, as the spring characteristic of the double torsion spring 7, the spring force (load force) that urges the movable contact 4 in the closing direction increases as the deflection angle α increases, so the movable contact 4 uses this spring force. In response, the opening speed is greatly reduced and the circuit breaker's breaking characteristics are degraded.
[0010]
The present invention has been made in view of the above points, and is intended for a circuit breaker equipped with a current breaker having the above-described configuration. It is an object of the present invention to provide a circuit breaker having an improved attachment structure of a contact pressure spring so as to reduce a load force for reducing the opening speed and improve a current limiting effect.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a movable contact having one arm provided with a movable contact at one end and the other arm provided with a movable contact at the other end is combined with a contact pressure spring. held in contact holder of the rotating drum type, causes the opening of the movable contact of the electromagnetic repulsion force as a driving force acting between the fixed contact and the movable contact when an overcurrent flows through the contact pressure spring Is a torsion coil spring of a double torsion type that is eccentric to the rotation center of the movable contact and is arranged on the back side of one arm part and the other arm part of the movable contact, respectively , and pulled out from both ends of the coil The leg is locked to the contact holder, and the offset arm pulled out from the center of the coil is bridged on the back of one arm and the other arm of the movable contact, and the movable contact is spring-biased in the closing direction. 2-contact cutting method In the circuit breaker,
(1) In the first aspect of the invention, after forming a tapered surface portion having a slope forwardly downwardly respectively to the back of one arm and the other arm portion of the movable contact, the offset of the contact pressure spring to the tapered surface The arm is pressed so that the movable contact is spring-biased (claim 1).
[0012]
According to this configuration, the contact point of the offset arm of the double torsion spring relatively moves forward along the tapered surface in accordance with the opening operation of the movable contact. In addition, since the tapered surface has a downward slope, the bending angle of the double torsion spring is smaller than that of the conventional structure shown in FIGS. 5 and 6, thereby preventing the opening action of the movable contact. Is reduced.
[0013]
(2) Further, in the second aspect of the invention, between the rotation center of the movable contact and the movable contact of one arm, and the side surface of one arm and the rotation center of the movable contact a between the movable contact of the other arm, and on which is provided the other arm side, respectively spring receiving the pin, so pressing the offset arm of the contact pressure spring to the pin, and the offset arms shall be bent in a direction to retreat from the locus of movement of the spring receiving pin with its tip open pole operation of the movable contactor (claim 2).
In the above configuration, at the closed position of the movable contact, the base side of the offset arm of the contact pressure spring contacts the spring receiving pin of the movable contact to apply contact pressure between the movable / fixed contacts. On the other hand, when the movable contact opens, the contact point (force point) between the offset arm and the spring receiving pin moves to the tip side of the offset arm. As described above, the tip of the offset arm is the spring receiving pin. Therefore, the bending angle of the contact pressure spring is reduced as compared with the conventional structure, and as a result, the resistance force of the contact pressure spring hinders the opening operation of the movable contact. To reduce.
[0014]
Furthermore, according to the present invention, as an embodiment of the second invention, the bending angle of the tip end portion of the offset arm of the contact pressure spring is pressed and biased to the opening position of the movable contact that is opened by electromagnetic repulsion. The movable contactor can be held at the opening position by the spring force of the contact pressure spring during the opening operation to prevent unnecessary recharging.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described based on the examples shown in FIGS. 1 (a) and 1 (b) and FIGS. 2 and 3. FIG. In the drawings of the respective embodiments, members corresponding to those in FIGS. 5 and 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
[Example 1]
FIGS. 1A and 1B show an embodiment corresponding to claim 1 of the present invention. This embodiment is basically the same as the conventional structure shown in FIGS. 5 and 6, and is double as a contact pressure spring that is installed in the space of the contact holder 5 and is interposed on the back side of the movable contact 4. With respect to the torsion spring (torsion coil spring) 7, an offset arm 7 b drawn forward from the center of the coil portion is pressed against the back surface of the movable contact 4. Here, in the illustrated embodiment, a taper surface 4c having a downward slope is formed on the back surface of the movable contact 4, and then the tip of the offset arm 7b of the double torsion spring 7 is pressed against the taper surface 4c to move the contact. In the illustrated embodiment, the taper angle θ of the taper surface 4c (relative angle of the taper surface 4c with respect to the back surface of the movable contact 4) is set to 35 °. .
[0016]
With the above configuration, in the closed state of FIG. 1A, the tip of the offset arm 7b of the double torsion spring 7 abuts on the surface of the tapered surface 4c with respect to the movable contact 4, and the movable contact 4 Contact pressure is applied to the contact. From this state, when the movable contact 4 is opened by receiving an electromagnetic repulsive force F caused by an overcurrent (short-circuit current), the offset arm 7b of the double torsion spring 7 relatively moves forward while sliding on the tapered surface 4c. In the maximum opening position of the movable contact 4 shown in FIG. 1 (b), the contact point of the offset arm 7b moves to the front end of the tapered surface 4c. The deflection angle α of the double torsion spring 7 accompanying this opening operation is 29. This is a reduction compared to the conventional deflection angle α = 40 ° shown in FIG. Thereby, the resistance force of the contact pressure spring that decelerates the opening speed of the movable contact 4 is reduced, and the current limiting effect is improved.
[0017]
[Example 2]
2 and 3 show an embodiment corresponding to claims 2 and 3 of the present invention. In this embodiment, a spring receiving pin 9 is newly provided to the movable contact 4 so as to pass through the contact piece and project to the left and right side surfaces at an intermediate portion between the rotation center O and the tip. On the other hand, the double torsion spring 7 mounted on the contact holder 5 as a contact pressure spring is eccentrically arranged on the lower surface side (opposite the back surface) of the movable contact 4 opposite to the first embodiment, and its offset. The arm 7b is arranged so as to cross over the left and right side surfaces of the movable contact 4 to the back side. Further, an intermediate portion 7b-1 in the longitudinal direction of the offset arm 7b drawn forward from the center of the coil portion is bent into a "<" shape, and a tip portion of the spring receiving pin 9 with respect to the rotation center O of the movable contact 4 is provided. It is formed so as to retreat inward from the movement locus P.
[0018]
With the above configuration, in the closed state of the movable contact 4 shown in FIGS. 2 (a) and 2 (b), the double torsion spring 7 is closer to the base side than the intermediate bending point of the offset arm 7a with respect to the spring receiving pin 9. The portions are in contact with each other, and the movable contact 4 is spring-biased in the closing direction. On the other hand, when the movable contact 4 is opened by receiving an electromagnetic repulsive force F caused by an overcurrent, the spring receiving pin 9 is rotated along the movement path P together with the movable contact 4 in the operation process. The contact point of the double torsion spring 7 with the offset arm 7b also moves to the tip side. When the contact point (force point) with the spring receiving pin 9 exceeds the intermediate bending point of the offset arm 7b and moves to the region on the tip end side, the direction of the spring force of the double torsion spring 7 acting on the spring receiving pin 9 ( The vector) changes, and works to hold the movable contact 4 in the open position via the spring receiving pin 9 depending on the bending angle. In the illustrated example, the bending angle α of the double torsion spring 7 corresponding to the movement of the movable contact 4 from the closing position to the maximum opening position is set to be the bending angle α = 40 ° in the conventional structure shown in FIG. On the other hand, it is reduced to only 14 °.
[0019]
That is, if the spring contact pin 9 is opened to some extent during the opening operation process of the movable contact 4 and the spring receiving pin 9 exceeds the intermediate bending point of the offset arm 7b of the double torsion spring 7, the opening direction of the movable contact 4 is hindered. The load force of the contact pressure spring acting on the abruptly decreases. Thereby, the deceleration of the opening speed of the movable contactor 4 is suppressed, and a high current limiting effect can be exhibited. In addition, if the bending angle of the offset arm 7b is set so that the movable contact 4 that has reached the opening position is held at the opening position by the spring force of the double torsion spring 7 as shown in FIG. Reliability of interrupting operation by avoiding the trouble that the movable contact 4 hits the wall surface of case 1 (see Fig. 4 (b)) of the current interrupting part and reverses to the closed position by the reaction. Can be increased.
[0020]
The movable contact 4 pressed and held in the open position is rotated by rotating the contact holder 5 in the clockwise direction by the reset operation of the circuit breaker performed after the trip operation, whereby the offset arm 7b of the double torsion spring 7 is obtained. And the contact point of the spring receiving pin 9 shift to the base side of the offset arm, whereby the movable contact 4 returns to the closed position.
[0021]
【The invention's effect】
As described above, the following effects are achieved by the configuration of the present invention.
That is, a movable contact having one arm portion having a movable contact at one end and the other arm portion having a movable contact at the other end is held in a rotary drum-shaped contact holder in combination with a contact pressure spring. together thereby opening the movable contact as a driving force of electromagnetic repulsive force acting between the fixed contact and the movable contact when current flows, the contact pressure spring with the center of rotation and eccentricity of the movable contact Double torsion type torsion coil springs arranged on the back side of one arm part and the other arm part of the movable contact, respectively , the legs drawn from both ends of the coil are locked to the contact holder, and the coil center In a two-contact circuit breaker in which an offset arm pulled out from the arm is stretched over one arm and the other arm of the movable contact so that the movable contact is spring-biased in the closing direction. ,
(1) on which is formed a tapered surface portion having a slope forwardly downwardly respectively to the back of one arm and the other arm portion of the movable contact, the movable pressing a offset arm of the contact pressure spring to the tapered surface According to the structure of claim 1 in which the contact is spring-biased, the bending angle of the double torsion spring accompanying the opening operation of the movable contact is smaller than that of the conventional structure, thereby opening the movable contact. The resistance force to decelerate the extreme speed is reduced, and the current limiting effect is improved.
[0022]
(2) Also, it is between the rotation center and the movable contact of one arm of the movable contact, and the side surface of the one arm, the movable center of rotation and the other arm portion of the movable contact a between the contact point and on which is provided the other arm side, respectively spring receiving the pin, so pressing the offset arm of the contact pressure spring to the pin, and the offset arm, the distal end According to the structure of claim 2, the contact pressure spring of the movable contact according to the opening operation of the movable contact is bent in a direction retreating from the movement trajectory of the spring receiving pin accompanying the opening operation of the movable contact. The deflection angle is reduced compared to the conventional structure, and the current-limiting effect can be improved as in the previous item (1).
[0023]
(3) Further, in the configuration of (2), the bending angle of the tip of the offset arm of the contact pressure spring is an angle that presses and urges the movable contact that has been opened by electromagnetic repulsion to its opening position. According to the configuration of the third aspect, the movable contactor is held at the opening position by the spring force of the contact pressure spring at the time of opening operation, and unnecessary recharging can be prevented, and the reliability of the cutting operation is improved. To do.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a current interrupting unit corresponding to Example 1 of the present invention, in which (a) and (b) are side views showing states of closing and opening operations, respectively. FIG. 3 is a configuration diagram of a current interrupting unit corresponding to Example 2 of the present invention, in which (a) and (b) are side views showing a closed state, and a plan view of a movable contactor and a contact pressure spring portion. The side view showing the open state corresponding to an Example. [FIG. 4] It is the conventional block diagram of the electric current interruption part of the circuit breaker used as the implementation object of this invention, (a) is a partially notched top view, (b) Is a side view showing the internal structure, (c) is an external perspective view showing an assembly structure in which a movable contact and a contact pressure spring are mounted on the contact holder. FIG. 5 is a configuration diagram of the main part in FIG. , (b) is a side view showing the closed state of the movable contact, and a plan view of the movable contact combined with the contact pressure spring. [FIG. 6] The opening operation of the movable contact corresponding to FIG. State side Plan [Explanation of symbols]
2,3 Fixed contact 4 Movable contact 4a Movable contact 4b Back surface 5 Contact holder 7 Double torsion spring (contact pressure spring)
7a Leg 7b Offset arm 7c Intermediate bending point 9 Tapered surface O Rotation center of movable contact

Claims (3)

一端に可動接点を設けた一方の腕部および他端に可動接点を設けた他方の腕部を有する可動接触子を接圧ばねと組合せて回転ドラム形の接触子ホルダに保持し、過電流が流れた際に固定接触子と可動接触子との間に働く電磁反発力を駆動力として可動接触子を開極させるとともに、前記接圧ばねを可動接触子の回転中心と偏芯して前記可動接触子の一方の腕部および他方の腕部の背面側にそれぞれ配したダブルトーション形の捩じりコイルばねとし、そのコイル両端から引き出した脚を接触子ホルダに係止させ、コイル中央から引き出したオフセットアームを可動接触子の一方の腕部および他方の腕部の背面にそれぞれ架け渡して可動接触子を閉極方向にばね付勢するようにした２接点切り方式の回路遮断器において、
前記可動接触子の一方の腕部および他方の腕部の背面にそれぞれ前下がり勾配をもつテーパ面部を形成した上で、そのテーパ面に前記接圧ばねのオフセットアームを押し当てて可動接触子をばね付勢するようにしたことを特徴とする回路しゃ断器。 A movable contact having one arm portion having a movable contact at one end and the other arm portion having a movable contact at the other end is held in a rotary drum-shaped contact holder in combination with a contact pressure spring, and overcurrent is generated. together thereby opening the movable contact as a driving force of electromagnetic repulsive force acting between the fixed contact and the movable contact upon the flow, the movable said contact pressure spring to rotate around the eccentric of the movable contact Double torsion type torsion coil springs arranged on the back side of one arm part and the other arm part of the contact , respectively , the legs pulled out from both ends of the coil are locked to the contact holder and pulled out from the center of the coil an offset arm in the circuit breaker of one arm and the other of the two-contact cutting method in which the movable contact in bridging respectively to spring bias in the closing direction on the back of the arm portion of the movable contact with,
After having formed a tapered surface portion having a slope forwardly downwardly respectively to the back of one arm and the other arm portion of the movable contact, the movable contact is pressed against the offset arm of the contact pressure spring to the tapered surface A circuit breaker characterized by being spring-biased. 一端に可動接点を設けた一方の腕部および他端に可動接点を設けた他方の腕部を有する可動接触子を接圧ばねと組合せて回転ドラム形の接触子ホルダに保持し、過電流が流れた際に固定接触子と可動接触子との間に働く電磁反発力を駆動力として可動接触子を開極させるとともに、前記接圧ばねを可動接触子の回転中心と偏芯して前記可動接触子の一方の腕部および他方の腕部の反背面側にそれぞれ配したダブルトーション形の捩じりコイルばねとし、そのコイル両端から引き出した脚を接触子ホルダに係止させ、コイル中央から引き出したオフセットアームを可動接触子の一方の腕部および他方の腕部の背面にそれぞれ架け渡して可動接触子を閉極方向にばね付勢するようにした２接点切り方式の回路遮断器において、
前記可動接触子の回転中心と一方の腕部の可動接点との間であって、かつ一方の腕部の側面と、前記可動接触子の回転中心と他方の腕部の可動接点との間であって、かつ他方の腕部の側面にそれぞればね受けピンを設けた上で、該ピンに接圧ばねのオフセットアームを押し当てるようにし、かつ該オフセットアームは、その先端部を可動接触子の開極動作に伴う前記ばね受けピンの移動軌跡から後退する向きに屈曲形成したことを特徴とする回路しゃ断器。 A movable contact having one arm portion having a movable contact at one end and the other arm portion having a movable contact at the other end is held in a rotary drum-shaped contact holder in combination with a contact pressure spring, and overcurrent is generated. together thereby opening the movable contact as a driving force of electromagnetic repulsive force acting between the fixed contact and the movable contact upon the flow, the movable said contact pressure spring to rotate around the eccentric of the movable contact one arm and the other arm of the double torsion type torsion coil Banetoshi which arranged respectively in the counter back side of the contact, is engaged legs drawn from the coil ends to the contact holder, a coil center In a circuit breaker of a two-contact cutting type in which the offset arm that has been pulled out is stretched over the back of one arm part and the other arm part of the movable contact so that the movable contact is spring-biased in the closing direction.
Between the rotation center of the movable contact and the movable contact of one arm, and between the side surface of one arm and the rotation center of the movable contact and the movable contact of the other arm. there are, and on which is provided the other arm side, respectively spring receiving the pin, so pressing the offset arm of the contact pressure spring to the pin, and the offset arm, the movable contact of the tip portion A circuit breaker, wherein the circuit breaker is bent in a direction retreating from a movement locus of the spring receiving pin accompanying the opening operation. 請求項２記載の回路しゃ断器において、接圧ばねのオフセットアームの先端部を、電磁反発力により開極動作した可動接触子をその開極位置に押圧付勢するような角度に屈曲形成したことを特徴とする回路しゃ断器。3. The circuit breaker according to claim 2, wherein the tip end portion of the offset arm of the contact pressure spring is bent at an angle that presses and urges the movable contact that has been opened by electromagnetic repulsion to its opening position. Circuit breaker characterized by.
JP2002235890A 2002-08-13 2002-08-13 Circuit breaker Expired - Lifetime JP4147344B2 (en)

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CN100418174C (en) * 2005-04-15 2008-09-10 德力西电气有限公司 Circuit breaker contact mechanism
CN100418172C (en) * 2005-04-15 2008-09-10 德力西电气有限公司 Current-limiting mechanism for circuit breaker
CN108133868B (en) * 2017-12-29 2024-04-30 武汉长海电气科技开发有限公司 Direct current contactor contact system

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JPS492642B1 (en) * 1970-12-29 1974-01-22
JPS5475055A (en) * 1977-11-28 1979-06-15 Hitachi Ltd Current limiting breaker
JPS62184648U (en) * 1986-05-14 1987-11-24
DE3852455T2 (en) * 1987-10-01 1996-04-18 Cge-Compagnia Generale Elettromeccanica S.P.A., Mailand/Milano Manual and electromagnetically operated contact arrangement for current-limiting switches.
JPH088507Y2 (en) * 1988-06-14 1996-03-06 株式会社東芝 Circuit breaker
JPH11185590A (en) * 1997-12-25 1999-07-09 Hitachi Ltd Circuit breaker

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