JP3609281B2

JP3609281B2 - Circuit breaker

Info

Publication number: JP3609281B2
Application number: JP8652399A
Authority: JP
Inventors: 征浩伏見; 伸示山県; 士郎村田; 孝夫三橋; 満月間
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1998-11-10
Filing date: 1999-03-29
Publication date: 2005-01-12
Anticipated expiration: 2019-03-29
Also published as: JP2000208020A

Description

【０００１】
【発明の属する技術分野】
この発明は、短絡電流のような大電流が流れたとき、可動接触子と固定接触子の間に発生する電磁反発力により、可動接触子が高速に開極するようになされた回路遮断器に関する。
【０００２】
【従来の技術】
図３３は、例えば特開平４ー１２６３１４号公報に示された従来の回路遮断器の可動接触子部分を示す正面図で、図３４はその側面図である。
図において、１は固定接触子、２は固定接触子１に固着された固定接点、３は固定接触子１に対向して接離する可動接触子、４は可動接触子３に固着された可動接点、５は可動接触子３を回動自在に保持するクロスバーである。６は固定導体であり、平行に対向する導体で形成された挟持接続導体７を有しており、この挟持接続導体７は可動接触子３と接触する部分に摺動接触部８を有する。９は可動接触子３の回転軸である。１０は可動接触子３と摺動接触部８を強制的に押し付け、接触部の電気抵抗を低減するための押しばねである。１１は可動接点４を固定接点２に押し付けて所定の接点圧力を与え、接点間の電気抵抗を低減するための押しばねである。
【０００３】
次に従来の回路遮断器の動作について説明する。回路遮断器に短絡電流等の過大な電流が流れると、回路遮断器の検出部（図示せず）の引外しを待たず、平行する固定接触子１と可動接触子３の間に生ずる電磁反発力により、可動接触子３は回転軸９を中心に固定接触子１から離れる方向に反発回動する。従って、回路遮断器に過大電流が流れはじめてから可動接点４と固定接点２が開離するまでの時間を短縮でき、遮断性能が向上する。
【０００４】
【発明が解決しようとする課題】
上記のような従来の回路遮断器では、電磁反発力により可動接触子３が固定接触子１から電磁反発した後、例えばクロスバー５のようなストッパー部材、あるいは、筐体に設けたストッパー部材に激突し、その反動で固定接触子１の方向に跳ね返ることがある。この跳ね返りにより可動接点４と固定接点２との距離が再接近すると、アークの発生状態が継続するので遮断時間が遅くなり、遮断性能が低下するという問題点があった。
【０００５】
この発明は、かかる問題点を解決するためになされたものであり、電磁反発力によって固定接触子から遠ざかった可動接触子が、再び固定接触子方向に跳ね返るのを防止することにより、遮断時間を短くして遮断性能を向上できる回路遮断器を得ることを目的としている。
【０００６】
【課題を解決するための手段】
この発明に係る回路遮断器においては、起倒形の操作ハンドルに連結されたトグルリンク機構と、このトグルリンク機構に連結されて上記トグルリンク機構の動作により回動するようになされたクロスバーと、一端に可動接点を有し、他端が回動できるように上記クロスバー内に軸支され、かつ、上記クロスバーが回動したとき連動して開閉動作を行うようになされた可動接触子と、上記可動接点が接離する固定接点を一端に有する固定接触子とを備えて、上記接触子に大電流が流れたとき上記可動接触子が電磁反発開離するようになされた回路遮断器において、上記可動接触子の他端に突出して形成された制動作用部と、二股状に形成され上記制動作用部を両側から挟持し、かつ、可動接触子に通電できるようになされた挟持接続導体を備え、上記可動接触子が電磁反発開離したとき、上記可動接触子の制動作用部が上記挟持接続導体に挟持される位置に回動するように上記制動作用部を形成し、上記電磁反発したとき、上記挟持接続導体を流れる電流に基づく電磁力により上記挟持接続導体が制動作用部を押圧するように構成したものである。
【０００７】
また、可動接触子が電磁反発開離したとき、制動作用部が挟持接続導体を通り過ぎた位置に回動するように制動作用部を形成し、挟持接続導体を流れる電流に基づく電磁力により挟持接続導体の間隔を狭めるようにしたものである。即ち、回動した制動作用部が狭められた挟持接続導体に当接して跳ね返りが抑止されるようにしたものである。
【０００８】
また、挟持接続導体の外周を囲むように磁性材料で形成されたヨークを設けることにより、挟持接続導体を流れる電流に基づく電磁力と制動作用部との関係を強くしたものである。
【０００９】
また、挟持接続導体の外周を囲む磁性材料製のヨークを設けたものにおいて、可動接触子が電磁反発開離したとき、制動作用部が挟持接続導体を通り過ぎた位置に回動するように制動作用部を形成し、挟持接続導体を流れる電流に基づく電磁力によりヨークの一端が制動作用部を押圧して可動接触子の跳ね返りにブレーキをかけるようにしたものである。
【００１０】
また、挟持接続導体の外周を囲む磁性材料製のヨークを設けたものにおいて、可動接触子が電磁反発開離したとき、制動作用部が挟持接続導体を通り過ぎた位置に回動するように制動作用部を形成すると共に、ヨークに制動作用部の方向に突出できるように構成されたプランジャを設け、挟持接続導体を流れる電流に基づく電磁力によりプランジャが突出するようにしたものである。即ち、突出したプランジャが挟持接続導体に当接して跳ね返りが抑止されるようにしたものである。
【００１１】
また、可動接触子が電磁反発開離したとき、可動接触子の制動作用部が挟持接続導体から若干外れる位置に回動するように制動作用部を形成すると共に、ヨークの開口部側の端面に対向して接離する可動鉄片を設け、可動接触子が電磁反発開離したとき、挟持接続導体を流れる電流に基づく電磁力によりヨークに可動鉄片が吸着し、この可動鉄片が上記回動した制動作用部を係止することにより、跳ね返りが抑止されるようにしたものである。
【００１２】
また、可動接触子に第二の制動作用部を設けることにより、可動接触子が小さな過電流で電磁反発開離したとき、可動鉄片が第二の制動作用部を係止する。この係止により、小さな電磁反発開離であっても可動接触子がもとに戻らないようにしたものである。
【００１３】
さらに、可動接触子が電磁反発開離したとき、可動接触子の制動作用部が挟持接続導体を通り過ぎた位置に回動するように制動作用部を形成すると共に、挟持接続導体の両側に磁性材料で形成された一対の可動ヨークを設け、電磁反発開離したとき、挟持接続導体を流れる電流に基づく電磁力により一対の可動ヨークが挟持接続導体を囲むように吸着し、回動した制動作用部を係止するように構成したものである。
【００１４】
【発明の実施の形態】
実施の形態１．
図１は、この発明の実施の形態１である回路遮断器を示す要部破断側面図であり、可動接触子が反発動作した状態を示す。図２は、図１に示す回路遮断器がオン状態であるときを示す要部破断側面図である。図３は、図１に示す回路遮断器がオフ状態またはトリップ動作状態を示す要部破断側面図である。
【００１５】
これらの図面は、いずれも、ハンドルとクレドルの間に設ける開閉機構部の図示を省略したものである。図４はこの発明の回路遮断器の可動接触子を示す斜視図、図５はこの発明の回路遮断器の固定導体及び挟持接続導体を示す斜視図、図６はこの発明の回路遮断器の可動接触子部を示す斜視図である。
【００１６】
図において、１は固定接触子、２は固定接触子１に固着された固定接点、４は後述の可動接触子１３に固着された可動接点、５は可動接触子１３を回動自在に保持するクロスバーである。９は可動接触子１３の回転軸である。これらは、上記従来装置と同様なものであり、その説明を省略する。
【００１７】
１３は回転軸９に回動自在に軸支された可動接触子であり、図４に示すように、中間部に軸支用の貫通孔１３ａが設けられ、一端部に可動接点４が固着されている。また、他端部には制動作用部１３ｂが突出して形成されている。この制動作用部１３ｂの位置は、可動接触子１３が固定接触子１から電磁反発により開離したとき、後述の挟持接続導体１７に挟持される位置に回動するように形成されている。
【００１８】
さらに、図１において、１４はひねりばねであり、可動接触子１３に対し挟持接続導体１７が電気的に接続されるように押圧すると共に、可動接点４を固定接点２に所定の圧力で押圧する働きを有している。従って、可動接触子１３と挟持接続導体１７の接触部の電気抵抗を低減し、また、可動接点４と固定接点２の電気抵抗を低減し電気的接触を良くしている。１５は回路遮断器の筐体であり、合成樹脂等の絶縁材料で形成され、可動接触子１３が固定接触子１から開離したときに、可動接触子１３が衝突する部分にストッパー部１５ａが設けられている。１６は固定導体であり、図５及び図６に示すように、基部１６ａと、この基部１６ａから立上がり熱動引外し用のヒータ（図示せず）等に接続される接続部１６ｂと、基部１６ａの両端から折り曲げられ基部１６ａに直角方向に平行して延設された二股状の挟持接続導体１７で構成されている。なお、挟持接続導体１７は主として回転軸９の部分で可動接触子１３と電気的に接触するように形成されている。１９は開閉機構部（図示せず）を回路遮断器の外部から開閉操作するハンドルである。なお、クロスバー５は開閉機構部（図示せず）の一部分を構成するものである。また、固定導体１６と挟持接続導体１７に関して、図５に示すものは一枚の銅または銅合金等の薄板で形成されているが、固定導体１６と挟持接続導体１７は別々に製作して一体化したものでもよい。
【００１９】
上記のように構成された回路遮断器においては、回路遮断器に短絡電流等の過大電流が流れると、固定接触子１と可動接触子１３を流れる過大電流に起因する電磁反発力により、可動接触子１３が回転軸９を中心に固定接触子１から離れる方向に回動する。この動作により、図１に示すように、制動作用部１３ｂが固定導体１６の挟持接続導体１７の間に回動した場合、可動接点４と固定接点２はアークにより繋がっているために、可動接触子１３を通って挟持接続導体１７及び固定導体１６に電流が流れる。このため、挟持接続導体１７に流れる同方向電流の電磁力によって、二股の挟持接続導体１７の間に互いに吸引力が作用する。この吸引力により２枚の挟持接続導体１７の間隙が縮まろうとするので、二股の挟持接続導体１７の間に介在する制動作用部１３ｂを両側から押圧する。
【００２０】
この押圧力により、制動作用部１３ｂの動きにブレーキをかけた状態になされる。このブレーキにより、可動接触子１３が筐体１５のストッパー部１５ａと激突した後に跳ね返り、再び固定接触子１の方向に復帰するのを抑制することができる。跳ね返りが抑制されたならば、固定接点２と可動接点４との間に発生したアークの消滅が速くなるので、遮断時間が短くなり遮断性能を向上させることができる。
なお、回路遮断器が電流を遮断した後は、二股の挟持接続導体１７の間に作用する電磁吸引力が消滅するため、制動作用部１３ｂを両側から押圧する押圧力は解除される。
【００２１】
実施の形態２．
図７は、この発明の実施の形態２である回路遮断器を示す要部破断側面図であり、可動接触子が電磁反発開離した状態を示す。図８は、図７に示す回路遮断器がオン状態であるときを示す要部破断側面図である。図９はこの発明の実施の形態２の回路遮断器の可動接触子を示す斜視図、図１０はこの発明の実施の形態２の回路遮断器の可動接触子部を示す斜視図である。図において、上記実施の形態１と同一または相当する部分には、同一符号を付してその説明を省略する。
【００２２】
上記の図面において、２３は回転軸９に回動自在に軸支された可動接触子であり、図９に示すように、中間部に軸支用の貫通孔２３ａが設けられ、一端部に可動接点４が固着されている。また、他端部には制動作用部２３ｂが突出して形成されている。この制動作用部２３ｂの位置は、可動接触子２３が固定接触子１から電磁反発により開離したとき、挟持接続導体１７を通り過ぎた位置に回動するように制動作用部２３ｂが形成されている。つまり、実施の形態１の可動接触子１３の制動作用部１３ｂの位置よりも筐体１５の底面１５ｂ寄りに突出し、可動接触子２３が固定接触子１から反発開離時には、挟持接続導体１７の下端面１７ａから外れる位置になるように形成されている。
【００２３】
上記の構成において、固定接触子１と可動接触子２３に短絡電流等の過大電流が流れると、その過大電流に起因する電磁反発力により、可動接触子２３が回転軸９を中心にして、固定接触子１から離れる方向に回動する。この回動により、制動作用部２３ｂが挟持接続導体１７の下端面１７ａから外れる位置に移動すると同時に、図１０に示すように、挟持接続導体１７は、Ａ方向の電磁吸引力により二股の挟持接続導体１７の相対向する距離が制動作用部２３ｂの板厚よりも狭くなる位置まで撓む。
【００２４】
この挟持接続導体１７の撓みにより、可動接触子２３がストッパー部１５ａに激突し、その反動で跳ね返りが発生しても、制動作用部２３ｂの上端面２３ｃが挟持接続導体１７の下端面１７ａと係合して制動作用部２３ｂの動きが阻止される。従って、可動接触子２３が再び固定接触子１の方向に復帰するのを抑制することができるため、遮断時間が短くなり遮断性能を向上させることができる。
なお、回路遮断器が電流を遮断した後は、二股の挟持接続導体１７間に働く電磁吸引力が消滅するため、挟持接続導体１７の撓みは無くなり、挟持接続導体１７と制動作用部２３ｂとの係合は解除される。
【００２５】
実施の形態３．
図１１は、この発明の実施の形態３である回路遮断器の可動接触子部を示す斜視図である。図１２は、図１１に示すヨーク３０の部分を切断して示す断面図である。図において、上記実施の形態１と同一または相当する部分、即ち、固定接触子１、固定接点２、クロスバー５、回転軸９、ひねりばね１４、筐体１５、ストッパー１５ａ、ハンドル１９は図示を省略する。従って、可動接触子部についてのみ説明する。
【００２６】
上記の図１１及び図１２において、固定導体１６及び挟持接続導体１７は、上記実施の形態１で説明したものと同様のものである。３３は回転軸９（図示せず）に回動自在に軸支された可動接触子であり、図１１に示すように、中間部に軸支用の貫通孔３３ａが設けられ、一端部に可動接点４が固着されている。
また、他端部には制動作用部３３ｂが突出して形成されている。この制動作用部３３ｂの位置は、可動接触子３３が固定接触子１（図示せず）から電磁反発により開離したとき、挟持接続導体１７を通り過ぎた位置に回動するように制動作用部３３ｂが形成されている。つまり、実施の形態１の可動接触子１３の制動作用部１３ｂの位置よりも、図１２に示すように、筐体１５の底面１５ｂ寄りに突出し、可動接触子３３が固定接触子１から反発開離時には、挟持接続導体１７の下端面１７ａから若干外れる位置になるように形成されている。
【００２７】
３０は磁性材料で形成されたヨークであり、挟持接続導体１７に巻き付けるように設けられている。このヨーク３０の下端には図１２に示すように制動作用部３３ｂの両側に対向して押圧爪３０ａが設けられている。この押圧爪３０ａは、制動作用部３３ｂに当接できるように形成されている。
【００２８】
上記構成の可動接触子部において、固定接触子１と可動接触子３３を流れる過大電流に起因する電磁反発力により、可動接触子３３が回転軸９を中心に固定接触子１から離れる方向に回動する。この動作により、制動作用部３３ｂが固定導体１６の挟持接続導体１７を通り過ぎた位置に回動した場合、可動接点４と固定接点２はアークにより繋がっているために、可動接触子３３を通って固定導体１６に電流が流れるので、固定導体１６の挟持接続導体１７に流れる同方向電流の電磁力によって、ヨーク３０が磁化され押圧爪３０ａが制動作用部３３ｂの両側を押圧する。
【００２９】
この押圧力により、制動作用部３３ｂの動きを阻止するので、可動接触子３３が筐体１５のストッパー部１５ａと激突した後に跳ね返り、再び固定接触子１の方向に復帰するのを抑制することができる。従って、固定接点２と可動接点４との間に発生したアークの消滅が速くなるので、遮断時間が短くなり遮断性能を向上させることができる。
なお、回路遮断器が電流を遮断した後は、ヨーク３０に作用する電磁吸引力が消滅するため、制動作用部３３ｂを両側から押圧する押圧力は解除される。
【００３０】
実施の形態４．
図１３は、この発明の実施の形態４である回路遮断器の可動接触子部を示す斜視図である。図１４は、図１３の線Ｅ−Ｅに沿う断面図である。図１５は、この発明の実施の形態４の回路遮断器の固定導体部分及び挟持接続導体部分を示す分解斜視図である。図において、実施の形態１と同一または相当する部分、即ち、固定接触子１、固定接点２、クロスバー５、回転軸９、ひねりばね１４、筐体１５、ストッパー１５ａ、ハンドル１９は図示を省略する。従って、可動接触子部についてのみ説明する。
【００３１】
上記の図１３ないし図１５において、３６は固定導体であり、実施の形態１と同様の一対の挟持接続導体３７が形成され、図１５に示すように、一方の挟持接続導体３７の下端部３７ａ近傍に貫通孔３７ｂが設けられている。４０は磁性材料で形成されたヨークであり、挟持接続導体３７に巻き付けるように設けられている。そして、一方のヨーク片に貫通孔４０ａが設けられ、それぞれのヨーク片には挟持接続導体３７の下端部３７ａに係合する一対の爪部４０ｂを有している。４１は磁性材料で形成されたプランジャであり、頭部４１ａと、軸部４１ｂと、溝部４１ｃとを備えている。
【００３２】
プランジャ４１の頭部４１ａの外径は、ヨーク４０の貫通孔４０ａの直径よりも大きく、かつ、挟持接続導体３７の貫通孔３７ｂの直径よりも小さく、頭部４１ａの軸方向の長さが挟持接続導体３７の板厚よりも短く形成されている。軸部４１ｂの外径はヨーク４０の貫通孔４０ａの直径よりも小さく形成されている。溝部４１ｃの谷径は軸部４１ｂの外径よりも小さく形成されている。４２はプランジャ４１を矢印Ｂ方向へ付勢する押しばね、４３は押しばね４２の一端を受止める座金、４４はＥ形止め輪でありプランジャ４１の溝部４１ｃに嵌挿されている。
【００３３】
なお、可動接触子５３は前記実施の形態２とほぼ同様のものである。即ち、制動作用部５３ｂの位置は、可動接触子５３が固定接触子１（図示せず）から電磁反発により開離したとき、挟持接続導体３７を通り過ぎた位置に回動するように制動作用部５３ｂが形成されたものである。そして、可動接触子５３と、固定導体３６と、挟持接続導体３７と、ヨーク４０と、プランジャ４１と、押しばね４２などは、図１３、図１４に示すように組立てられている。
【００３４】
上記のように構成された回路遮断器においては、図１４に示すように、固定導体３６の挟持接続導体３７にヨーク４０を組合わせることにより、通常時は、プランジャ４１は押しばね４２によりヨーク４０の内壁面に当接するよう矢印Ｂ方向に引込まれているが、挟持接続導体３７に短絡電流等の過大電流が流れた場合、ヨーク４０、プランジャ４１を通過する磁束により押しばね４２の付勢力を上回る矢印Ｃ方向の電磁力が発生し、プランジャ４１が矢印Ｃ方向へ突出する。
【００３５】
従って、固定接触子１と可動接触子５３を流れる短絡電流等の過大電流に起因する電磁反発力により、可動接触子５３が回転軸９を中心にして、固定接触子１から離れる方向に回動し、可動接触子５３の制動作用部５３ｂがプランジャ４１の位置から外れる位置に達すると、図１４に一点鎖線で示すように、プランジャ４１は矢印Ｃ方向に作用する電磁力により、左方向へ突出し、頭部４１ａの先端と相対向する挟持接続導体３７の壁面との距離Ｌが、可動接触子５３の制動作用部５３ｂの板厚Ｔより狭くなる。
【００３６】
上記のように、可動接触子５３が筐体１５のストッパー部１５ａと激突後に跳ね返りが発生したときに、可動接触子５３の制動作用部５３ｂがプランジャ４１の頭部４１ａと係合するので、可動接触子５３が再び固定接触子１の方向に復帰するのを防止することができる。従って、遮断時間が短くなり遮断性能を向上させることができる。
【００３７】
なお、回路遮断器が電流を遮断した後は、挟持接続導体３７に電流が流れなくなるため、プランジャ４１は押しばね４２の付勢力により矢印Ｂ方向に移動して元の位置に復帰し、頭部４１ａの先端と相対向する挟持接続導体３７の壁面との距離が大きくなる方向に動き、可動接触子５３の制動作用部５３ｂと頭部４１ａの係合は解除される。
【００３８】
実施の形態５．
図１６は、この発明の実施の形態５である回路遮断器を示す要部破断側面図であり、オン状態を示す。図１７は、図１６に示す回路遮断器の可動接触子が反発動作した状態を示す要部破断側面図である。図１８は、図１６に示す回路遮断器の可動接触子が反発動作位置から少し跳ね返った状態を示す要部破断側面図である。図１９は、図１６に示す回路遮断器がオフ状態またはトリップ動作状態を示す要部破断側面図である。図２０は、この発明の実施の形態５の回路遮断器の可動接触子部を示す斜視図である。図２１は、図１８に示す回路遮断器の可動接触子部を示す拡大側面図である。図２２は、可動接触子部の分解斜視図である。
【００３９】
図において、６３は回転軸９に回動自在に軸支された可動接触子であり、図２２に示すように、中間部に軸支用の貫通孔６３ａが設けられ、一端部に可動接点４が固着されている。また、他端部には制動作用部６３ｂが突出して形成されている。この制動作用部６３ｂの位置は、可動接触子６３が固定接触子１から電磁反発により開離したとき、挟持接続導体１７の下端面１７ａを通り過ぎた位置に回動するように制動作用部６３ｂが形成されている。
【００４０】
６５は磁性材料で形成されたヨークであり、断面がＵ字状に形成され、このＵ字状の開口部が一対の挟持接続導体１７を囲むように設けられている。６６は磁性材料で形成された可動鉄片であり、基板６６ａと、この基板６６ａの一端から両側に突出した一対の支軸６６ｂと、基板６６ａの一方の側面から突出したばね掛け部６６ｃとで形成されている。この可動鉄片６６は、挟持接続導体１７の下方でヨーク６５の開口部側の端面６５ａに対向するように配設され、その一対の支軸６６ｂが筐体１５の図示しない軸穴に回動自在に支持されている。そして、この可動鉄片６６は、支軸６６ｂとばね掛け部６６ｃに装着されたひねりばね６７により、図１６に示すように、常時は、ヨーク６５の端面６５ａから開離される方向へ付勢されている。なお、２は固定接点、５はクロスバー、１４はひねりばね、１５は筐体、１５ａはストッパー部、１６は固定導体、１９はハンドルであり、これらは図１に示すものと同様のものである。
【００４１】
上記の構成において、固定接触子１と可動接触子６３を流れる過大電流に起因する電磁反発力により、可動接触子６３が回転軸９を中心に固定接触子１から離れる方向に回動する。この動作により、制動作用部６３ｂが固定導体１６の挟持接続導体１７を通り過ぎた位置に回動した場合、可動接点４と固定接点２はアークにより繋がっているために、可動接触子６３を通って固定導体１６に電流が流れるので、固定導体１６の挟持接続導体１７に流れる同方向電流の電磁力によって、挟持接続導体１７を囲むように装着された一対のヨーク６５が磁化され、図１７に示すように、ヨーク６５の端面６５ａに可動鉄片６６が吸着される。上記の電磁反発力による可動接触子６３の回動と、可動鉄片６６の吸着とは、ほとんど同時に発生する。従って、制動作用部６３ｂが挟持接続導体１７を通り過ぎた位置に回動するとき、吸着中の可動鉄片６６を押しのけて回動することもある。この制動作用部６３ｂが回動し可動鉄片６６が吸着した状態（図１７の状態）においては、可動接触子６３の制動作用部６３ｂと可動鉄片６６の先端面６６ｄとの間には隙間がある。
【００４２】
次に、可動接触子６３が筐体１５のストッパー部１５ａと激突した後に跳ね返り、再び固定接触子１の方向に復帰しようとすると、図１８に示すように、可動接触子６３の制動作用部６３ｂと可動鉄片６６の先端面６６ｄが係合する。
この係合により制動作用部６３ｂの動きを阻止するので、可動接触子６３が筐体１５のストッパー部１５ａと激突した後に跳ね返り、再び固定接触子１の方向に復帰するのを抑制することができる。従って、固定接点２と可動接点４との間に発生したアークの消滅が速くなるので、遮断時間が短くなり遮断性能を向上させることができる。
【００４３】
また、可動接触子６３が電磁反発開離後に、過電流引き外し装置（図示せず）が働き、開閉機構部（図示せず）が動作すると、この開閉機構部に連動したクロスバー５が回転軸９を中心に反時計方向へ回動するので、制動作用部６３ｂと可動鉄片６６の先端面６６ａが係合が解除され、図１９に示すように、可動接触子６３は筐体１５のストッパー部１５ａまで開離し、回路遮断器は電流の遮断動作を行ない周知のトリップ動作状態となる。
【００４４】
実施の形態６．
図２３は、この発明の実施の形態６である回路遮断器を示す要部破断側面図であり、可動接触子が比較的小さな過電流で反発動作した状態を示す。図２４は、図２３に示す回路遮断器の可動接触子部を示す側面図である。図２５は、この発明の回路遮断器の可動接触子を示す側面図である。
【００４５】
図において、７３は回転軸９に回動自在に軸支された可動接触子であり、図２５に示すように、中間部に軸支用の貫通孔７３ａが設けられ、一端部に可動接点４が固着されている。また、他端部には第一の制動作用部７３ｂと第二の制動作用部７３ｃが突出して形成されている。この第一の制動作用部７３ｂと第二の制動作用部７３ｃの位置は、可動接触子７３が固定接触子１から電磁反発により開離したとき、挟持接続導体１７を通り過ぎた位置に回動するように制動作用部７３ｂ，７３ｃが形成されている。即ち、第一の制動作用部７３ｂは実施の形態５に示す制動作用部６３ｂ（図２１，図２２参照）と同じ位置に形成され、第二の制動制御部７３ｃの位置は第一の制動作用部７３ｂと同じ円周上で反時計方向に寄った位置に形成されている。
なお、２は固定接点、５はクロスバー、１４はひねりばね、１５は筐体、１５ａはストッパー部、１６は固定導体、１７は挟持接続導体、１９はハンドルであり、これらは図１に示すもの、及び、実施の形態５における図１６ないし図２２に示すものと同様のものである。また、６５はヨーク、６５ａは開口部側の端面、６６は可動鉄片、６７はひねりばねであり、これらは実施の形態５のものと同様のものである。
【００４６】
上記の構成において、固定接触子１と可動接触子７３を流れる過大電流が比較的に小さい場合には、この電流に起因する小さな電磁反発力が発生し、図２３に示すように、この小さな電磁反発力により可動接触子７３が回転軸９を中心に固定接触子１から離れる方向に僅かに回動する。この動作により、第二の制動作用部７３ｃが固定導体１６の挟持接続導体１７を通り過ぎた位置に回動した場合、可動接点４と固定接点２はアークにより繋がっているために、可動接触子７３を通って固定導体１６に電流が流れる。従って、固定導体１６の挟持接続導体１７に流れる同方向電流の電磁力によって、挟持接続導体１７を囲むように装着されたヨーク６５が磁化され、図２３，図２４に示すように、ヨーク６５の端面６５ａに可動鉄片６６が吸着される。この状態において、可動接触子７３の第二の制動作用部７３ｃと可動鉄片６６の先端面６６ｄとが係合する。
【００４７】
この係合により制動作用部７３ｃの動きを阻止するので、可動接触子７３が再び固定接触子１の方向に復帰するのを抑制することができる。従って、固定接点２と可動接点４との間に発生したアークの消滅が速くなるので、遮断時間が短くなり遮断性能を向上させることができる。
【００４８】
また、固定接触子１と可動接触子７３を流れる過大電流が比較的に大きい場合には、この電流に起因する大きな電磁反発力により、実施の形態６で述べたと同様に、第一の制動作用部７３ｂと可動鉄片６６の先端面６６ｄが係合するので、実施の形態６と同様の効果を奏する。
【００４９】
この実施の形態６の構成によれば、固定接触子１と可動接触子７３を流れる過大電流が比較的に小さい場合には、可動接触子７３の第二の制動作用部７３ｃと可動鉄片６６の先端面６６ｄとが係合し、固定接触子１と可動接触子７３を流れる過大電流が比較的に大きい場合には、可動接触子７３の第一の制動作用部７３ｂと可動鉄片６６の先端面６６ｄとが係合するので、固定接触子１と可動接触子７３を流れる大小の過大電流に対して可動接触子７３が再び固定接触子１の方向に復帰するのを抑制することができる。
【００５０】
なお、可動接触子７３が電磁反発開離後に、過電流引き外し装置（図示せず）が働き、開閉機構部（図示せず）が動作すると、この開閉機構部に連動したクロスバー５が回転軸９を中心に反時計方向へ回動するので、第一の制動作用部７３ｂまたは第二の制動作用部７３ｃと可動鉄片６６の先端面６６ｄとの係合が解除され、可動接触子７３は筐体１５のストッパー部１５ａまで開離し、回路遮断器は電流の遮断動作を行ない周知のトリップ動作状態となる。
【００５１】
実施の形態７．
図２６は、この発明の実施の形態７である回路遮断器の可動接触子部を示す斜視図である。図２７は、図２６の線ア−アに沿う断面図である。図２８は、この発明の回路遮断器の可動接触子部の分解斜視図である。図において、上記実施の形態１と同一または相当する部分、即ち、固定接触子１、固定接点２、クロスバー５、回転軸９、ひねりばね１４、筐体１５、ストッパー部１５ａ、底面１５ｂ、ハンドル１９は図示を省略する。従って、可動接触子部についてのみ説明する。
【００５２】
上記の図２６ないし図２８において、８３は回転軸９（図示せず）に回動自在に軸支された可動接触子であり、図２８に示すように、中間部に軸支用の貫通孔８３ａが設けられ、一端部に可動接点４が固着されている。また、他端部には制動作用部８３ｂが突出して形成されている。この制動作用部８３ｂの位置は、可動接触子８３が固定接触子１から電磁反発により開離したとき、挟持接続導体１７を通り過ぎた位置に回動するように制動作用部８３ｂが形成されている。つまり、実施の形態１の可動接触子１３の制動作用部１３ｂの位置よりも筐体１５の底面１５ｂ寄りに突出し、可動接触子８３が固定接触子１から反発開離時には、挟持接続導体１７の下端面１７ａから若干外れる位置になるように形成されている。
【００５３】
８５は磁性材料で形成された一対のヨークであり、断面がＵ字状に形成され、このＵ字状の開口部が挟持接続導体１７を囲むように、一対の挟持接続導体１７の両側に装着され、常時は図２７に二点鎖線で示すように、押しばね８７により筐体１５（図示せず）側へ押付けられ装着されている。この時、一対のヨーク８５の開口部側の端面８５ａ間の距離は、可動接触子８３の制動作用部８３ｂの板厚より広くなるように構成されている。
【００５４】
上記構成の可動接触子部において、固定接触子１と可動接触子８３を流れる過大電流に起因する電磁反発力により、可動接触子８３が回転軸９（図示せず）を中心に固定接触子１から離れる方向に回動する。この動作により、制動作用部８３ｂが固定導体１６の挟持接続導体１７を通り過ぎた位置に回動した場合、可動接点４と固定接点２はアークにより繋がっているために、可動接触子８３を通って固定導体１６に電流が流れるので、固定導体１６の一対の挟持接続導体１７に流れる同方向電流の電磁力によって、挟持接続導体１７の両側に装着された一対のヨーク８５が磁化され、一対のヨーク８５の間にＦ方向の吸引力が働き、押しばね８７を圧縮して挟持接続導体１７を囲むように対向する端面８５ａが吸着される。
【００５５】
この吸着作用により、可動接触子８３の制動作用部８３ｂがヨーク８５の下端面８５ｂと係合して制動作用部８３ｂの動きが阻止されるので、可動接触子８３が筐体１５のストッパー部１５ａと激突した後に跳ね返り、再び固定接触子１の方向に復帰するのを抑制することができる。従って、固定接点２と可動接点４との間に発生したアークの消滅が速くなるので、遮断時間が短くなり遮断性能を向上させることができる。
【００５６】
また、可動接触子８３が電磁反発開離後に、過電流引き外し装置（図示せず）が働き、開閉機構部（図示せず）が動作すると、この開閉機構部に連動したクロスバー５が回転軸９を中心に反時計方向へ回動するので、制動作用部８３ｂとヨーク８５の下端面８５ｂとの係合が解除され、可動接触子８３は筐体１５のストッパー部１５ａまで開離し、回路遮断器は電流の遮断動作を行ない周知のトリップ動作状態となる。
【００５７】
即ち、回路遮断器が電流を遮断した後は、ヨーク８５に作用する電磁吸引力が消滅するため、一対のヨーク８５間の吸引力が無くなり、ヨーク８５の下端面８５ｂと制動作用部８３ｂとの係合は解除される。
【００５８】
さらに、押しばね８７は一対の挟持接続導体１７を可動接触子８３の両側面に押圧する効果も有するので、可動接触子８３に対し挟持接続導体１７が電気的に接続されるように押圧するひねりばね１４（図６に示す）のコイル部の機能を兼ねることができ、遮断容量の小さな回路遮断器に適用可能である。また、遮断容量の大きい回路遮断器に適用した場合には、コイル部の荷重を下げることができるので、ばね応力が低減されてひねりばね１４の耐久性能が向上する。
【００５９】
実施の形態８．
図２９は、この発明の実施の形態８である回路遮断器を示す要部破断側面図であり、オン状態を示す。図３０は、図２９に示す回路遮断器の可動接触子が反発動作した状態を示す要部破断側面図である。図３１は、この発明の実施の形態８の可動接触子部を示す分解斜視図である。図３２は、この発明の実施の形態８の吸引鉄片を示す斜視図である。
【００６０】
図において、９３は回転軸９に回動自在に軸支された可動接触子であり、図３１に示すように、一方の端部に軸支用の貫通孔９３ａが設けられ、他方の端部に可動接点４が固着されている。また、中間部にリベット貫通孔９３ｂが設けられている。９５は磁性材料で形成された吸引鉄片であり、断面がコ字状に形成され、リベット貫通孔９５ａが設けてある。そして、吸引鉄片９５のコ字状の開口部が可動接触子９３を囲むように装着され、リベット９６をリベット貫通孔９５ａからリベット貫通孔９３ｂに通して可動接触子９３に固着される。９７は磁性材料で形成された固定鉄片であり、筐体１５のストッパー部１５ａの側壁において、図３０に示すように可動接触子９３が反発動作した状態で吸引鉄片９５が対向する位置に固着されている。
なお、１は固定接触子、２は固定接点、５はクロスバー、１４はひねりばね、１６は固定導体、１７は挟持接続導体、１９はハンドルであり、これらは図１に示すものと同様のものである。
【００６１】
上記の構成において、固定接触子１と可動接触子９３を流れる過大電流に起因する電磁反発力により、可動接触子９３が回転軸９を中心に固定接触子１から離れ、筐体１５のストッパー１５ａに衝突する位置まで回動する。この位置に回動した場合、可動接点４と固定接点２はアークにより繋がっているために、可動接触子９３を通って固定導体１６に流れる電流によって、可動鉄片９５を通り固定鉄片９７に誘起される磁束が発生し、この磁束により電磁力が発生し、可動鉄片９５が固定鉄片９７に吸引される。
【００６２】
この吸引作用により可動接触子９３の動きが阻止され、可動接触子９３が筐体１５のストッパー部１５ａと激突した後に跳ね返り、再び固定接触子１の方向に復帰するのを抑制することができる。従って、固定接点２と可動接点４との間に発生したアークの消滅が速くなるとともに、可動接触子９３の開極動作時において可動鉄片９５が固定鉄片９７に吸引されることにより、可動接触子９３の開離スピードが速くなるので、遮断時間が短くなり遮断性能を向上させることができる。
【００６３】
【発明の効果】
この発明の回路遮断器は、以上説明したように構成されているので、以下に示すような効果を奏する。
【００６４】
大電流が流れたとき可動接触子が電磁反発開離するようになされた回路遮断器において、可動接触子の他端に突出して形成された制動作用部と、二股状に形成され上記制動作用部を両側から挟持し、かつ、可動接触子に通電できるようになされた挟持接続導体を備え、可動接触子が電磁反発開離したとき、挟持接続導体を流れる電流に基づく電磁力による挟持接続導体の変位によって、可動接触子の電磁反発開離時の跳ね返りを抑制するようにしたので、遮断時間が短くなり遮断性能を向上させることができる。
【００６５】
また、可動接触子に吸引鉄片を装着し、筐体のストッパー部の側壁に固定鉄片を設け、可動接触子が電磁反発開離したとき、固定鉄片に吸引鉄片を吸引させることによっても上記と同様の効果が得られる。
【図面の簡単な説明】
【図１】この発明の実施の形態１である回路遮断器を示す要部破断側面図であり、回路遮断器が反発動作した状態を示す。
【図２】図１に示す回路遮断器がオン状態であるときを示す要部破断側面図である。
【図３】図１に示す回路遮断器がオフ状態またはトリップ動作状態であるときを示す要部破断側面図である。
【図４】この発明の実施の形態１の回路遮断器の可動接触子を示す斜視図である。
【図５】この発明の実施の形態１の回路遮断器の固定導体と挟持接続導体を示す斜視図である。
【図６】この発明の実施の形態１の可動接触子部を示す斜視図である。
【図７】この発明の実施の形態２である回路遮断器を示す要部破断側面図であり、可動接触子が反発動作した状態を示す。
【図８】図７に示す回路遮断器がオン状態であるときを示す要部破断側面図である。
【図９】この発明の実施の形態２の回路遮断器の可動接触子を示す斜視図である。
【図１０】この発明の実施の形態２の回路遮断器の可動接触子部を示す斜視図である。
【図１１】この発明の実施の形態３である回路遮断器の可動接触子部を示す斜視図である。
【図１２】図１１におけるヨーク部分で切断した断面図である。
【図１３】この発明の実施の形態４である回路遮断器の可動接触子部を示す斜視図である。
【図１４】図１３の線Ｅ−Ｅに沿う断面図である。
【図１５】この発明の実施の形態４の主要部を示す分解斜視図である。
【図１６】この発明の実施の形態５である回路遮断器を示す要部破断側面図であり、オン状態を示す。
【図１７】図１６に示す回路遮断器の可動接触子が反発動作した状態を示す要部破断側面図である。
【図１８】図１６に示す回路遮断器の可動接触子が反発動作位置から少し跳ね返った状態を示す要部破断側面図である。
【図１９】図１６に示す回路遮断器がオフ状態またはトリップ動作状態を示す要部破断側面図である。
【図２０】この発明の実施の形態５の回路遮断器の可動接触子部を示す斜視図である。
【図２１】図１８に示す回路遮断器の可動接触子部を示す拡大側面図である。
【図２２】この発明の実施の形態５の回路遮断器の可動接触子部の分解斜視図である。
【図２３】この発明の実施の形態６である回路遮断器を示す要部破断側面図であり、可動接触子が比較的小さな過電流で反発動作した状態を示す。
【図２４】この発明の実施の形態６の回路遮断器の可動接触子部を示す側面図である。
【図２５】この発明の実施の形態６の回路遮断器の可動接触子を示す側面図である。
【図２６】この発明の実施の形態７である回路遮断器の可動接触子部を示す斜視図である。
【図２７】図２６の線ア−アに沿う断面図である。
【図２８】この発明の実施の形態７の回路遮断器の可動接触子部の分解斜視図である。
【図２９】この発明の実施の形態８である回路遮断器を示す要部破断側面図であり、オン状態を示す。
【図３０】図２９に示す回路遮断器の可動接触子が反発動作した状態を示す要部破断側面図である。
【図３１】この発明の実施の形態８の可動接触子部を示す分解斜視図である。
【図３２】この発明の実施の形態８の可動鉄片を示す斜視図である。
【図３３】従来の回路遮断器の可動接触子部分を示す正面図である。
【図３４】従来の回路遮断器の可動接触子部分を示す側面図である。
【符号の説明】
１固定接触子、２固定接点、４可動接点、５クロスバー、
９回転軸、
１３，２３，３３，５３，６３，７３，８３，９３可動接触子、
１３ｂ，２３ｂ，３３ｂ，５３ｂ，６３ｂ，８３ｂ制動作用部、
１５筐体、１６固定導体、１７，３７挟持接続導体、
３０，４０，６５、８５ヨーク、４１プランジャ、６６可動鉄片
、７３ｂ第一の制動作用部、７３ｃ第二の制動作用部、８７押しばね、
９５吸引鉄片、９７固定鉄片。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker in which a movable contact is opened at a high speed by an electromagnetic repulsive force generated between the movable contact and the fixed contact when a large current such as a short-circuit current flows. .
[0002]
[Prior art]
FIG. 33 is a front view showing a movable contact portion of a conventional circuit breaker disclosed in, for example, Japanese Patent Laid-Open No. 4-126314, and FIG. 34 is a side view thereof.
In the figure, 1 is a fixed contact, 2 is a fixed contact fixed to the fixed contact 1, 3 is a movable contact contacting and separating from the fixed contact 1, and 4 is a movable contact fixed to the movable contact 3. A contact 5 is a cross bar that rotatably holds the movable contact 3. Reference numeral 6 denotes a fixed conductor, which has a sandwiching connection conductor 7 formed of conductors facing in parallel, and the sandwiching connection conductor 7 has a sliding contact portion 8 at a portion in contact with the movable contact 3. Reference numeral 9 denotes a rotating shaft of the movable contact 3. Reference numeral 10 denotes a pressing spring for forcibly pressing the movable contact 3 and the sliding contact portion 8 to reduce the electrical resistance of the contact portion. Reference numeral 11 denotes a pressing spring that presses the movable contact 4 against the fixed contact 2 to give a predetermined contact pressure and reduce the electrical resistance between the contacts.
[0003]
Next, the operation of the conventional circuit breaker will be described. When an excessive current such as a short circuit current flows through the circuit breaker, the electromagnetic repulsion generated between the parallel fixed contact 1 and the movable contact 3 without waiting for the trip of the detection unit (not shown) of the circuit breaker. Due to the force, the movable contact 3 repulsively rotates around the rotation shaft 9 in the direction away from the fixed contact 1. Therefore, it is possible to shorten the time from when the excessive current starts to flow to the circuit breaker until the movable contact 4 and the fixed contact 2 are separated, and the breaking performance is improved.
[0004]
[Problems to be solved by the invention]
In the conventional circuit breaker as described above, after the movable contact 3 is electromagnetically repelled from the fixed contact 1 by the electromagnetic repulsive force, for example, a stopper member such as the crossbar 5 or a stopper member provided on the housing is provided. Clash, and the reaction may bounce back in the direction of the stationary contact 1. When the distance between the movable contact 4 and the fixed contact 2 approaches again due to the rebound, the arc generation state continues, so that the interruption time is delayed and the interruption performance is deteriorated.
[0005]
The present invention has been made to solve such a problem, and by preventing the movable contact that has moved away from the fixed contact due to the electromagnetic repulsion force from bouncing back in the direction of the fixed contact, the interruption time can be reduced. The purpose is to obtain a circuit breaker that can be shortened to improve the breaking performance.
[0006]
[Means for Solving the Problems]
In the circuit breaker according to the present invention,A toggle link mechanism connected to a tilting operation handle, a crossbar connected to the toggle link mechanism and rotated by the operation of the toggle link mechanism, a movable contact at one end, and the like A movable contact that is pivotally supported in the crossbar so that the end can be rotated and that opens and closes in conjunction with the rotation of the crossbar, and a fixed contact between the movable contact and the movable contact. In a circuit breaker comprising a fixed contact having a contact at one end, and the movable contact is electromagnetically repelled and separated when a large current flows through the contact,A braking action portion that protrudes from the other end of the movable contact; and a pinching connection conductor that is formed in a bifurcated shape so as to sandwich the braking action portion from both sides and that can be energized to the movable contact. When the movable contact is released from electromagnetic repulsion,The braking action part is formed so that the braking action part of the movable contact is pivoted to a position held by the holding connection conductor, and when the electromagnetic repulsion occurs, an electromagnetic force based on a current flowing through the holding connection conductor is used. The sandwiched connecting conductor is configured to press the braking action part.It is a thing.
[0007]
Also,When the movable contact is separated from the electromagnetic repulsion, the braking action part is formed so that the braking action part rotates to a position past the sandwiching connection conductor, and the sandwiching connection conductor of the sandwiching connection conductor is formed by the electromagnetic force based on the current flowing through the sandwiching connection conductor. The interval is narrowed. In other words, the revolving braking action part is brought into contact with the narrowed connecting conductor to suppress the rebound.Is.
[0008]
Also,By providing a yoke made of a magnetic material so as to surround the outer periphery of the sandwiched connection conductor, the relationship between the electromagnetic force based on the current flowing through the sandwiched connection conductor and the braking action portion is strengthened.
[0009]
Also,In the case where a yoke made of a magnetic material surrounding the outer periphery of the sandwiching connection conductor is provided, when the movable contact is separated from the electromagnetic repulsion, the braking action portion is arranged so that the braking action portion rotates to a position past the sandwiching connection conductor. The one end of the yoke presses the braking action part by the electromagnetic force based on the current flowing through the sandwiched connection conductor, and the movable contact is rebounded.Is.
[0010]
Also,In the case where a yoke made of a magnetic material surrounding the outer periphery of the sandwiching connection conductor is provided, when the movable contact is separated from the electromagnetic repulsion, the braking action portion is arranged so that the braking action portion rotates to a position past the sandwiching connection conductor. In addition, the plunger is provided on the yoke so as to be able to protrude in the direction of the braking action portion, and the plunger is protruded by an electromagnetic force based on the current flowing through the holding connection conductor. In other words, the protruding plunger abuts against the pinching connection conductor to prevent rebound.Is.
[0011]
Also,When the movable contact is separated from the electromagnetic repulsion, the braking action part is formed so that the braking action part of the movable contact rotates slightly away from the sandwiched connection conductor, and is opposed to the end surface on the opening side of the yoke. The movable iron piece is attracted to the yoke by the electromagnetic force based on the current flowing through the holding connection conductor when the movable contact piece is separated from the electromagnetic repulsion and separated, and the movable iron piece is rotated as described above. Bounce is suppressed by lockingIs.
[0012]
Also,By providing the second braking action part on the movable contact, the movable iron piece locks the second braking action part when the movable contact is electromagnetically repelled and released by a small overcurrent. This locking prevents the movable contact from returning to its original state even with a small electromagnetic repulsion separation.Is.
[0013]
Furthermore, when the movable contact is electromagnetically repelled and separated, the braking action portion of the movable contact is rotated so as to rotate to a position past the sandwiched connection conductor, and a magnetic material is formed on both sides of the sandwich connection conductor. When the pair of movable yokes formed in the above are provided and electromagnetic repulsion is released, the pair of movable yokes are attracted so as to surround the sandwiched connection conductor by the electromagnetic force based on the current flowing through the sandwiched connection conductor, and the braking action part rotated. Configured to lockIs.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a cutaway side view showing a main part of a circuit breaker according to Embodiment 1 of the present invention, and shows a state in which a movable contact is repelled. FIG. 2 is a cutaway side view of an essential part showing when the circuit breaker shown in FIG. 1 is in an ON state. FIG. 3 is a fragmentary cutaway side view showing the circuit breaker shown in FIG. 1 in an off state or a trip operation state.
[0015]
In these drawings, the opening / closing mechanism provided between the handle and the cradle is not shown. 4 is a perspective view showing a movable contact of the circuit breaker according to the present invention, FIG. 5 is a perspective view showing a fixed conductor and a pinching connection conductor of the circuit breaker according to the present invention, and FIG. 6 is a movable view of the circuit breaker according to the present invention. It is a perspective view which shows a contact part.
[0016]
In the figure, 1 is a fixed contact, 2 is a fixed contact fixed to the fixed contact 1, 4 is a movable contact fixed to a movable contact 13, which will be described later, and 5 is rotatably held by the movable contact 13. It is a crossbar. Reference numeral 9 denotes a rotating shaft of the movable contact 13. These are the same as those of the above-described conventional apparatus, and the description thereof is omitted.
[0017]
1Reference numeral 3 denotes a movable contact that is pivotally supported by a rotating shaft 9. As shown in FIG. 4, a pivotal support through-hole 13 a is provided at an intermediate portion, and the movable contact 4 is fixed to one end. ing. Moreover, the braking action part 13b protrudes and is formed in the other end part. When the movable contact 13 is separated from the fixed contact 1 by electromagnetic repulsion, the position of the braking action portion 13b is formed so as to rotate to a position that is held by a holding connection conductor 17 described later.
[0018]
Further, in FIG. 1, reference numeral 14 denotes a torsion spring that presses the movable contact 13 so that the sandwiched connection conductor 17 is electrically connected, and presses the movable contact 4 to the fixed contact 2 with a predetermined pressure. Has a function. Therefore, the electrical resistance of the contact portion between the movable contact 13 and the sandwiching connection conductor 17 is reduced, and the electrical resistance between the movable contact 4 and the fixed contact 2 is reduced to improve the electrical contact. Reference numeral 15 denotes a circuit breaker housing, which is formed of an insulating material such as a synthetic resin. When the movable contact 13 is separated from the fixed contact 1, a stopper portion 15a is formed at a portion where the movable contact 13 collides. Is provided. Reference numeral 16 denotes a fixed conductor. As shown in FIGS. 5 and 6, a base portion 16a, a connecting portion 16b connected to a heater (not shown) that rises from the base portion 16a and rises in thermal motion, and the base portion 16a. It is composed of a bifurcated sandwiched connecting conductor 17 that is bent from both ends and extends in parallel to the base 16a in a direction perpendicular to the base 16a. The sandwiching connection conductor 17 is formed so as to be in electrical contact with the movable contact 13 mainly at the portion of the rotary shaft 9. Reference numeral 19 denotes a handle for opening / closing a switching mechanism (not shown) from the outside of the circuit breaker. The cross bar 5 constitutes a part of an opening / closing mechanism (not shown). Further, with respect to the fixed conductor 16 and the sandwiching connection conductor 17, the one shown in FIG. 5 is formed of a single sheet of copper or copper alloy, but the fixed conductor 16 and the sandwiching connection conductor 17 are separately manufactured and integrated. It may be converted.
[0019]
In the circuit breaker configured as described above, when an excessive current such as a short-circuit current flows through the circuit breaker, the movable contact is caused by the electromagnetic repulsive force caused by the excessive current flowing through the fixed contact 1 and the movable contact 13. The child 13 rotates about the rotation shaft 9 in a direction away from the fixed contact 1. By this operation, as shown in FIG. 1, when the braking action portion 13b is rotated between the sandwiching connection conductors 17 of the fixed conductor 16, the movable contact 4 and the fixed contact 2 are connected by an arc. A current flows through the child 13 to the sandwiching connection conductor 17 and the fixed conductor 16. For this reason, an attractive force acts between the bifurcated sandwiching connection conductors 17 due to the electromagnetic force of the same direction current flowing in the sandwiching connection conductors 17. Since the gap between the two sandwiched connecting conductors 17 tends to be reduced by this suction force, the braking action portion 13b interposed between the two sandwiched connecting conductors 17 is pressed from both sides.
[0020]
By this pressing force, the braking action portion 13b is brought into a braked state. With this brake, it is possible to prevent the movable contact 13 from bouncing off after colliding with the stopper portion 15a of the housing 15 and returning to the fixed contact 1 again. If the rebound is suppressed, the arc generated between the fixed contact 2 and the movable contact 4 disappears quickly, so that the interruption time is shortened and the interruption performance can be improved.
After the circuit breaker cuts off the current, the electromagnetic attractive force acting between the bifurcated sandwiched connecting conductors 17 disappears, so that the pressing force that presses the braking action portion 13b from both sides is released.
[0021]
Embodiment 2. FIG.
FIG. 7 is a fragmentary side view showing a circuit breaker according to the second embodiment of the present invention, and shows a state where the movable contact is electromagnetically repelled and separated. FIG. 8 is a fragmentary cutaway side view showing the circuit breaker shown in FIG. 7 in an on state. FIG. 9 is a perspective view showing a movable contact of a circuit breaker according to Embodiment 2 of the present invention, and FIG. 10 is a perspective view showing a movable contact of the circuit breaker according to Embodiment 2 of the present invention. In the figure, parts that are the same as or equivalent to those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
[0022]
In the above drawings, reference numeral 23 denotes a movable contact that is pivotally supported by a rotating shaft 9, and as shown in FIG. 9, a shaft-supporting through hole 23a is provided at an intermediate portion and movable at one end. The contact 4 is fixed. Moreover, the braking action part 23b protrudes and is formed in the other end part. The position of the braking action portion 23b is such that when the movable contact 23 is separated from the fixed contact 1 by electromagnetic repulsion, the braking action portion 23b is rotated so as to rotate to a position past the pinching connection conductor 17. . That is, when the movable contact 23 protrudes closer to the bottom surface 15b of the housing 15 than the position of the braking action portion 13b of the movable contact 13 of the first embodiment, It forms so that it may become a position which remove | deviates from the lower end surface 17a.
[0023]
In the above configuration, when an excessive current such as a short circuit current flows through the fixed contact 1 and the movable contact 23, the movable contact 23 is fixed around the rotary shaft 9 due to an electromagnetic repulsive force caused by the excessive current. It rotates in a direction away from the contact 1. By this rotation, the braking action portion 23b moves to a position away from the lower end surface 17a of the sandwiching connection conductor 17, and at the same time, as shown in FIG. 10, the sandwiching connection conductor 17 is bifurcated by the electromagnetic attracting force in the A direction. The conductor 17 bends to a position where the opposing distance of the conductor 17 becomes narrower than the plate thickness of the braking action portion 23b.
[0024]
Even if the movable contact 23 collides with the stopper portion 15 a due to the bending of the sandwiching connection conductor 17 and rebounds, the upper end surface 23 c of the braking action portion 23 b is engaged with the lower end surface 17 a of the sandwiching connection conductor 17. At the same time, the movement of the braking action portion 23b is prevented. Therefore, since it can suppress that the movable contact 23 returns to the direction of the stationary contact 1 again, interruption | blocking time becomes short and interruption | blocking performance can be improved.
After the circuit breaker cuts off the current, the electromagnetic attractive force acting between the bifurcated sandwiching connection conductor 17 disappears, so that the sandwiching connection conductor 17 is not bent, and the sandwiching connection conductor 17 and the braking action portion 23b are not bent. The engagement is released.
[0025]
Embodiment 3 FIG.
FIG. 11: is a perspective view which shows the movable contact part of the circuit breaker which is Embodiment 3 of this invention. 12 is a cross-sectional view showing the yoke 30 shown in FIG. In the figure, the same or corresponding parts as in the first embodiment, that is, the fixed contact 1, the fixed contact 2, the cross bar 5, the rotary shaft 9, the twist spring 14, the casing 15, the stopper 15a, and the handle 19 are shown in the drawing. Omitted. Therefore, only the movable contact portion will be described.
[0026]
11 and 12 aboveAnd hardThe constant conductor 16 and the sandwiching connection conductor 17 are the same as those described in the first embodiment. Reference numeral 33 denotes a movable contact pivotally supported on a rotary shaft 9 (not shown). As shown in FIG. 11, a pivotal support through-hole 33a is provided in the intermediate portion and movable at one end. The contact 4 is fixed.
Moreover, the braking action part 33b protrudes and is formed in the other end part. The position of the braking action portion 33b is such that when the movable contact 33 is separated from the fixed contact 1 (not shown) by electromagnetic repulsion, the braking action portion 33b is rotated to a position past the pinching connection conductor 17. Is formed. That is, as shown in FIG. 12, it protrudes closer to the bottom surface 15b of the housing 15 than the position of the braking action portion 13b of the movable contact 13 of the first embodiment, and the movable contact 33 is repelled from the fixed contact 1. At the time of separation, the sandwiched connection conductor 17 is formed so as to be slightly out of the lower end surface 17a.
[0027]
A yoke 30 made of a magnetic material is provided so as to be wound around the sandwiched connection conductor 17. As shown in FIG. 12, a pressing claw 30a is provided at the lower end of the yoke 30 so as to face both sides of the braking action portion 33b. The pressing claw 30a is formed so as to be able to contact the braking action portion 33b.
[0028]
In the movable contact portion configured as described above, the movable contact 33 rotates in the direction away from the fixed contact 1 about the rotating shaft 9 due to the electromagnetic repulsive force caused by the excessive current flowing through the fixed contact 1 and the movable contact 33. Move. By this operation, when the braking action portion 33b is rotated to a position past the pinching connection conductor 17 of the fixed conductor 16, the movable contact 4 and the fixed contact 2 are connected by an arc. Since a current flows through the fixed conductor 16, the yoke 30 is magnetized by the electromagnetic force of the same direction current flowing through the pinching connection conductor 17 of the fixed conductor 16, and the pressing claw 30 a presses both sides of the braking action portion 33 b.
[0029]
Since this pressing force prevents the movement of the braking action portion 33b, it is possible to suppress the movable contact 33 from bouncing back after colliding with the stopper portion 15a of the housing 15 and returning to the fixed contact 1 again. it can. Accordingly, the disappearance of the arc generated between the fixed contact 2 and the movable contact 4 is accelerated, so that the interruption time is shortened and the interruption performance can be improved.
After the circuit breaker cuts off the current, the electromagnetic attractive force acting on the yoke 30 disappears, so that the pressing force that presses the braking action portion 33b from both sides is released.
[0030]
Embodiment 4 FIG.
FIG. 13: is a perspective view which shows the movable contact part of the circuit breaker which is Embodiment 4 of this invention. 14 is a cross-sectional view taken along line EE in FIG. FIG. 15 is an exploded perspective view showing the fixed conductor portion and the sandwiching connection conductor portion of the circuit breaker according to Embodiment 4 of the present invention. In the figure, the same or corresponding parts as in the first embodiment, that is, the fixed contact 1, the fixed contact 2, the cross bar 5, the rotary shaft 9, the twist spring 14, the casing 15, the stopper 15a, and the handle 19 are not shown. To do. Therefore, only the movable contact portion will be described.
[0031]
13 to 15, the reference numeral 36 denotes a fixed conductor, and a pair of sandwiching connection conductors 37 similar to those of the first embodiment are formed. As shown in FIG. 15, the lower end portion 37a of one sandwiching connection conductor 37 is formed. A through hole 37b is provided in the vicinity. A yoke 40 made of a magnetic material is provided so as to be wound around the sandwiched connection conductor 37. One yoke piece is provided with a through hole 40 a, and each yoke piece has a pair of claw portions 40 b that engage with the lower end portion 37 a of the sandwiching connection conductor 37. 41 is a plunger made of a magnetic material, and includes a head portion 41a, a shaft portion 41b, and a groove portion 41c.
[0032]
The outer diameter of the head portion 41a of the plunger 41 is larger than the diameter of the through hole 40a of the yoke 40 and smaller than the diameter of the through hole 37b of the holding connection conductor 37, and the axial length of the head portion 41a is held. The connection conductor 37 is formed shorter than the plate thickness. The outer diameter of the shaft portion 41 b is formed smaller than the diameter of the through hole 40 a of the yoke 40. The trough diameter of the groove part 41c is formed smaller than the outer diameter of the shaft part 41b. Reference numeral 42 denotes a push spring that urges the plunger 41 in the direction of arrow B, 43 denotes a washer that receives one end of the push spring 42, and 44 denotes an E-shaped retaining ring that is fitted into the groove 41 c of the plunger 41.
[0033]
The movable contact 53 is substantially the same as that in the second embodiment. That is, the position of the braking action portion 53b is such that when the movable contact 53 is separated from the stationary contact 1 (not shown) by electromagnetic repulsion, the braking action portion 53b is rotated to a position past the pinching connection conductor 37. 53b is formed. The movable contact 53, the fixed conductor 36, the sandwiching connection conductor 37, the yoke 40, the plunger 41, the push spring 42, and the like are assembled as shown in FIGS.
[0034]
In the circuit breaker configured as described above, as shown in FIG. 14, by combining the yoke 40 with the pinching connection conductor 37 of the fixed conductor 36, the plunger 41 is normally moved by the pressing spring 42 by the yoke 40. Is pulled in the direction of arrow B so as to abut against the inner wall surface, but when an excessive current such as a short-circuit current flows through the pinching connection conductor 37, the biasing force of the push spring 42 is applied by the magnetic flux passing through the yoke 40 and the plunger 41. An electromagnetic force in the direction of arrow C that exceeds the level is generated, and the plunger 41 projects in the direction of arrow C.
[0035]
Therefore, the movable contact 53 rotates about the rotation shaft 9 in the direction away from the fixed contact 1 due to an electromagnetic repulsive force caused by an excessive current such as a short-circuit current flowing through the fixed contact 1 and the movable contact 53. When the braking action portion 53b of the movable contact 53 reaches a position deviating from the position of the plunger 41, the plunger 41 protrudes to the left by the electromagnetic force acting in the direction of arrow C, as shown by a one-dot chain line in FIG. The distance L between the front end of the head 41 a and the wall surface of the sandwiching connection conductor 37 facing the tip is smaller than the plate thickness T of the braking action portion 53 b of the movable contact 53.
[0036]
As described above, when the movable contact 53 bounces after the collision with the stopper portion 15a of the casing 15, the braking action portion 53b of the movable contact 53 engages with the head portion 41a of the plunger 41. It is possible to prevent the contact 53 from returning to the fixed contact 1 again. Therefore, the interruption time is shortened and the interruption performance can be improved.
[0037]
After the circuit breaker cuts off the current, the current does not flow to the pinching connection conductor 37, so that the plunger 41 moves in the direction of arrow B by the urging force of the push spring 42 and returns to its original position, The distance between the front end of 41a and the wall surface of the sandwiched connecting conductor 37 facing each other increases, and the engagement between the braking action portion 53b of the movable contact 53 and the head portion 41a is released.
[0038]
Embodiment 5 FIG.
FIG. 16: is a principal part fracture side view which shows the circuit breaker which is Embodiment 5 of this invention, and shows an ON state. FIG. 17 is a cutaway side view of an essential part showing a state in which the movable contact of the circuit breaker shown in FIG. 16 is repelled. 18 is a cutaway side view of the main part showing a state in which the movable contact of the circuit breaker shown in FIG. 16 has slightly bounced from the repulsive operation position. FIG. 19 is a cutaway side view of a main part of the circuit breaker shown in FIG. 16 showing an off state or a trip operation state. FIG. 20 is a perspective view showing a movable contact portion of a circuit breaker according to Embodiment 5 of the present invention. FIG. 21 is an enlarged side view showing a movable contact portion of the circuit breaker shown in FIG. FIG. 22 is an exploded perspective view of the movable contact portion.
[0039]
In the figure, reference numeral 63 denotes a movable contact that is pivotally supported on the rotary shaft 9, and as shown in FIG. Is fixed. Moreover, the braking action part 63b protrudes and is formed in the other end part. The position of the braking action part 63b is such that when the movable contact 63 is separated from the fixed contact 1 by electromagnetic repulsion, the braking action part 63b is rotated to a position past the lower end surface 17a of the sandwiching connection conductor 17. Is formed.
[0040]
A yoke 65 made of a magnetic material has a U-shaped cross section, and the U-shaped opening is provided so as to surround the pair of sandwiching connection conductors 17. Reference numeral 66 denotes a movable iron piece made of a magnetic material, which is formed by a substrate 66a, a pair of support shafts 66b protruding from one end of the substrate 66a to both sides, and a spring hooking portion 66c protruding from one side surface of the substrate 66a. Has been. The movable iron piece 66 is disposed below the sandwiching connection conductor 17 so as to face the end surface 65a on the opening side of the yoke 65, and the pair of support shafts 66b can freely rotate in shaft holes (not shown) of the housing 15. It is supported by. Then, this movable iron piece 66 is normally urged in a direction to be separated from the end face 65a of the yoke 65 by a torsion spring 67 attached to the support shaft 66b and the spring hook 66c, as shown in FIG. Yes. 2 is a fixed contact, 5 is a cross bar, 14 is a twist spring, 15 is a housing, 15a is a stopper, 16 is a fixed conductor, and 19 is a handle, which are the same as those shown in FIG. is there.
[0041]
In the above configuration, the movable contact 63 rotates about the rotation shaft 9 in a direction away from the fixed contact 1 due to an electromagnetic repulsive force caused by an excessive current flowing through the fixed contact 1 and the movable contact 63. By this operation, when the braking action portion 63b is rotated to a position past the pinching connection conductor 17 of the fixed conductor 16, the movable contact 4 and the fixed contact 2 are connected by an arc. Since a current flows through the fixed conductor 16, the pair of yokes 65 that are mounted so as to surround the sandwiched connection conductor 17 are magnetized by the electromagnetic force of the current in the same direction flowing through the sandwiched connection conductor 17 of the fixed conductor 16, as shown in FIG. As described above, the movable iron piece 66 is attracted to the end surface 65 a of the yoke 65. The rotation of the movable contact 63 by the electromagnetic repulsion and the adsorption of the movable iron piece 66 occur almost simultaneously. Therefore, when the braking action part 63b rotates to a position past the sandwiching connection conductor 17, the movable iron piece 66 being attracted may be pushed and rotated. In a state where the braking action portion 63b is rotated and the movable iron piece 66 is attracted (state shown in FIG. 17), there is a gap between the braking action portion 63b of the movable contact 63 and the front end surface 66d of the movable iron piece 66. .
[0042]
Next, when the movable contact 63 bounces after colliding with the stopper portion 15a of the housing 15 and tries to return to the fixed contact 1 again, as shown in FIG. 18, the braking action portion 63b of the movable contact 63 is obtained. And the front end surface 66d of the movable iron piece 66 are engaged.
Since the movement of the braking action part 63b is prevented by this engagement, it is possible to prevent the movable contact 63 from bouncing after colliding with the stopper part 15a of the housing 15 and returning to the direction of the fixed contact 1 again. . Accordingly, the disappearance of the arc generated between the fixed contact 2 and the movable contact 4 is accelerated, so that the interruption time is shortened and the interruption performance can be improved.
[0043]
Further, after the movable contact 63 is separated from the electromagnetic repulsion, an overcurrent tripping device (not shown) is operated, and when the opening / closing mechanism (not shown) is operated, the crossbar 5 interlocked with the opening / closing mechanism is rotated. Since it rotates counterclockwise about the shaft 9, the engagement between the braking action portion 63 b and the tip surface 66 a of the movable iron piece 66 is released, and the movable contact 63 is a stopper of the housing 15 as shown in FIG. 19. The circuit breaker is cut off to the part 15a, and the circuit breaker performs a current breaking operation to be in a known trip operation state.
[0044]
Embodiment 6 FIG.
FIG. 23 is a cutaway side view showing a main part of a circuit breaker according to Embodiment 6 of the present invention, and shows a state in which the movable contact is repelled with a relatively small overcurrent. 24 is a side view showing a movable contact portion of the circuit breaker shown in FIG. FIG. 25 is a side view showing the movable contact of the circuit breaker according to the present invention.
[0045]
In the figure, reference numeral 73 denotes a movable contact that is pivotally supported by the rotary shaft 9, and as shown in FIG. Is fixed. Further, a first braking action part 73b and a second braking action part 73c are formed protruding from the other end part. The positions of the first braking action part 73b and the second braking action part 73c are rotated to a position past the pinching connection conductor 17 when the movable contact 73 is separated from the fixed contact 1 by electromagnetic repulsion. Thus, braking action portions 73b and 73c are formed. That is, the first braking action portion 73b is formed at the same position as the braking action portion 63b (see FIGS. 21 and 22) shown in the fifth embodiment, and the position of the second braking control portion 73c is the first braking action portion. It is formed at a position close to the counterclockwise direction on the same circumference as the portion 73b.
2 is a fixed contact, 5 is a cross bar, 14 is a twist spring, 15 is a housing, 15a is a stopper, 16 is a fixed conductor, 17 is a clamping connection conductor, 19 is a handle, and these are shown in FIG. And those similar to those shown in FIGS. 16 to 22 in the fifth embodiment. Also, 65 is a yoke, 65a is an end surface on the opening side, 66 is a movable iron piece, and 67 is a twister.NedeThese are the same as those in the fifth embodiment.
[0046]
In the above configuration, when the excessive current flowing through the fixed contact 1 and the movable contact 73 is relatively small, a small electromagnetic repulsive force is generated due to this current. As shown in FIG. Due to the repulsive force, the movable contact 73 rotates slightly in the direction away from the fixed contact 1 about the rotation shaft 9. By this operation, when the second braking action portion 73c is rotated to a position past the pinching connection conductor 17 of the fixed conductor 16, the movable contact 4 and the fixed contact 2 are connected by an arc, so that the movable contact 73 A current flows through the fixed conductor 16 through the fixed conductor 16. Therefore, the yoke 65 mounted so as to surround the sandwiching connection conductor 17 is magnetized by the electromagnetic force of the current in the same direction flowing through the sandwiching connection conductor 17 of the fixed conductor 16, and as shown in FIGS. The movable iron piece 66 is adsorbed on the end face 65a. In this state, the second braking action portion 73 c of the movable contact 73 engages with the tip end surface 66 d of the movable iron piece 66.
[0047]
Since the movement of the braking action part 73c is prevented by this engagement, it is possible to prevent the movable contact 73 from returning to the fixed contact 1 again. Accordingly, the disappearance of the arc generated between the fixed contact 2 and the movable contact 4 is accelerated, so that the interruption time is shortened and the interruption performance can be improved.
[0048]
Further, when the excessive current flowing through the stationary contact 1 and the movable contact 73 is relatively large, the first braking action is caused by the large electromagnetic repulsive force caused by this current, as described in the sixth embodiment. Since the portion 73b and the tip end surface 66d of the movable iron piece 66 are engaged, the same effect as in the sixth embodiment is obtained.
[0049]
According to the configuration of the sixth embodiment, when the excessive current flowing through the stationary contact 1 and the movable contact 73 is relatively small, the second braking action portion 73c of the movable contact 73 and the movable iron piece 66 When the tip surface 66d is engaged and the excessive current flowing through the stationary contact 1 and the movable contact 73 is relatively large, the first braking action portion 73b of the movable contact 73 and the tip surface of the movable iron piece 66 are used. Since 66d is engaged, it is possible to prevent the movable contact 73 from returning again in the direction of the fixed contact 1 due to a large and small excessive current flowing through the fixed contact 1 and the movable contact 73.
[0050]
After the movable contact 73 is separated from the electromagnetic repulsion, when the overcurrent tripping device (not shown) is operated and the opening / closing mechanism (not shown) is operated, the crossbar 5 interlocked with the opening / closing mechanism is rotated. Since it rotates counterclockwise around the shaft 9, the engagement between the first braking action portion 73 b or the second braking action portion 73 c and the tip surface 66 d of the movable iron piece 66 is released, and the movable contact 73 is The circuit breaker is opened up to the stopper 15a of the casing 15, and the circuit breaker performs a current breaking operation to enter a known trip operation state.
[0051]
Embodiment 7 FIG.
FIG. 26 is a perspective view showing a movable contact portion of a circuit breaker according to Embodiment 7 of the present invention. FIG. 27 is a cross-sectional view taken along the line area of FIG. FIG. 28 is an exploded perspective view of the movable contact portion of the circuit breaker according to the present invention. In the figure, the same or corresponding parts as in the first embodiment, that is, the fixed contact 1, the fixed contact 2, the cross bar 5, the rotary shaft 9, the twist spring 14, the casing 15, the stopper portion 15a, the bottom surface 15b, the handle. 19 is not shown. Therefore, only the movable contact portion will be described.
[0052]
In FIG. 26 to FIG. 28, reference numeral 83 denotes a movable contact that is pivotally supported on a rotary shaft 9 (not shown). As shown in FIG. 83a is provided, and the movable contact 4 is fixed to one end. Moreover, the braking action part 83b protrudes and is formed in the other end part. The position of this braking action part 83b is such that the braking action part 83b is formed so as to rotate to a position past the sandwiching connection conductor 17 when the movable contact 83 is separated from the fixed contact 1 by electromagnetic repulsion. . That is, when the movable contact 83 protrudes closer to the bottom surface 15b of the housing 15 than the position of the braking action portion 13b of the movable contact 13 of the first embodiment, It is formed so as to be slightly out of the lower end surface 17a.
[0053]
Reference numeral 85 denotes a pair of yokes made of a magnetic material. The yoke is mounted on both sides of the pair of sandwiching connection conductors 17 so that the cross section is formed in a U shape and the U-shaped opening surrounds the sandwiching connection conductor 17. In general, as shown by a two-dot chain line in FIG. At this time, the distance between the end surfaces 85 a on the opening side of the pair of yokes 85 is configured to be larger than the plate thickness of the braking action portion 83 b of the movable contact 83.
[0054]
In the movable contact portion configured as described above, the movable contact 83 is centered around the rotation shaft 9 (not shown) by the electromagnetic repulsive force caused by the excessive current flowing through the fixed contact 1 and the movable contact 83. Rotate in a direction away from By this operation, when the braking action portion 83b is rotated to a position past the pinching connection conductor 17 of the fixed conductor 16, the movable contact 4 and the fixed contact 2 are connected by an arc. Since a current flows through the fixed conductor 16, the pair of yokes 85 mounted on both sides of the sandwiching connection conductor 17 are magnetized by the electromagnetic force of the same direction current flowing through the pair of sandwiching connection conductors 17 of the fixed conductor 16. A suction force in the F direction works between the end faces 85a and the opposite end faces 85a are adsorbed so as to compress the push springs 87 and surround the sandwiched connection conductors 17.
[0055]
Due to this adsorption action, the braking action part 83b of the movable contactor 83 engages with the lower end surface 85b of the yoke 85 and the movement of the braking action part 83b is prevented, so that the movable contactor 83 becomes the stopper part 15a of the housing 15. It is possible to suppress the rebound after the collision and return to the stationary contact 1 again. Accordingly, the disappearance of the arc generated between the fixed contact 2 and the movable contact 4 is accelerated, so that the interruption time is shortened and the interruption performance can be improved.
[0056]
Further, after the movable contact 83 is separated from the electromagnetic repulsion, when the overcurrent tripping device (not shown) is operated and the opening / closing mechanism (not shown) is operated, the crossbar 5 interlocked with the opening / closing mechanism is rotated. Since it rotates counterclockwise about the shaft 9, the engagement between the braking action portion 83b and the lower end surface 85b of the yoke 85 is released, and the movable contact 83 is released to the stopper portion 15a of the housing 15, and the circuit The circuit breaker performs a current breaking operation and enters a known trip operation state.
[0057]
That is, after the circuit breaker cuts off the current, the electromagnetic attractive force acting on the yoke 85 disappears, so the attractive force between the pair of yokes 85 disappears, and the lower end surface 85b of the yoke 85 and the braking action portion 83b The engagement is released.
[0058]
Further, since the pressing spring 87 has an effect of pressing the pair of sandwiching connection conductors 17 on both side surfaces of the movable contactor 83, a twist that presses the sandwiching connection conductor 17 to be electrically connected to the movable contactor 83. The function of the coil portion of the spring 14 (shown in FIG. 6) can be doubled and can be applied to a circuit breaker having a small breaking capacity. Further, when applied to a circuit breaker having a large breaking capacity, the load on the coil portion can be reduced, so that the spring stress is reduced and the durability performance of the twist spring 14 is improved.
[0059]
Embodiment 8 FIG.
FIG. 29 is a fragmentary cutaway side view showing a circuit breaker according to Embodiment 8 of the present invention, and shows an ON state. 30 is a cutaway side view of the main part showing a state in which the movable contact of the circuit breaker shown in FIG. 29 is repelled. FIG. 31 is an exploded perspective view showing the movable contact portion according to the eighth embodiment of the present invention. FIG. 32 is a perspective view showing a suction iron piece according to the eighth embodiment of the present invention.
[0060]
In the figure, 93 is a movable contact pivotally supported on the rotary shaft 9, and as shown in FIG. 31, a shaft-supporting through hole 93a is provided at one end and the other end. The movable contact 4 is fixed to the surface. A rivet through-hole 93b is provided in the middle part. Reference numeral 95 denotes a suction iron piece made of a magnetic material, which has a U-shaped cross section and is provided with a rivet through hole 95a. The U-shaped opening of the suction iron piece 95 is mounted so as to surround the movable contact 93, and the rivet 96 is passed through the rivet through hole 95a through the rivet through hole 93b and fixed to the movable contact 93. Reference numeral 97 denotes a fixed iron piece made of a magnetic material, and is fixed to the side wall of the stopper portion 15a of the housing 15 at a position where the suction iron piece 95 faces in a state where the movable contact 93 is repelled as shown in FIG. ing.
1 is a fixed contact, 2 is a fixed contact, 5 is a cross bar, 14 is a twist spring, 16 is a fixed conductor, 17 is a clamping connection conductor, and 19 is a handle, which are the same as those shown in FIG. Is.
[0061]
In the above configuration, the movable contact 93 is separated from the fixed contact 1 around the rotating shaft 9 due to the electromagnetic repulsive force caused by the excessive current flowing through the fixed contact 1 and the movable contact 93, and the stopper 15 a of the housing 15. It will rotate to the position where it collides with. When it is rotated to this position, since the movable contact 4 and the fixed contact 2 are connected by an arc, the current flowing through the movable contact 93 to the fixed conductor 16 is induced by the fixed iron piece 97 through the movable iron piece 95. Magnetic flux is generated, electromagnetic force is generated by this magnetic flux, and the movable iron piece 95 is attracted to the fixed iron piece 97.
[0062]
The movement of the movable contact 93 is prevented by this suction action, and it is possible to suppress the movable contact 93 from rebounding after colliding with the stopper portion 15a of the housing 15 and returning to the fixed contact 1 again. Accordingly, the disappearance of the arc generated between the fixed contact 2 and the movable contact 4 is accelerated, and the movable iron piece 95 is attracted to the fixed iron piece 97 during the opening operation of the movable contact 93. Since the opening speed of 93 is increased, the blocking time is shortened and the blocking performance can be improved.
[0063]
【The invention's effect】
Since the circuit breaker according to the present invention is configured as described above, it has the following effects.
[0064]
In a circuit breaker in which the movable contact is electromagnetically repelled and separated when a large current flows, a braking action portion formed to project from the other end of the movable contact and the braking action portion formed in a bifurcated shape Of the sandwiched connection conductor by electromagnetic force based on the current flowing through the sandwiched connection conductor when the movable contact is separated from the electromagnetic repulsion when the movable contactor is electromagnetically repelled and released. The displacement is prevented from rebounding at the time of electromagnetic repulsion and separation of the movable contact, so that the interruption time is shortened and the interruption performance can be improved.
[0065]
Also, the same as above by attaching a suction iron piece to the movable contact, providing a fixed iron piece on the side wall of the stopper part of the housing, and causing the fixed iron piece to attract the suction iron piece when the movable contact is separated by electromagnetic repulsion The effect is obtained.
[Brief description of the drawings]
FIG. 1 is a cutaway side view of a main part of a circuit breaker according to a first embodiment of the present invention, showing a state in which the circuit breaker has repelled.
FIG. 2 is a cutaway side view of an essential part showing when the circuit breaker shown in FIG. 1 is in an ON state.
FIG. 3 is a cutaway side view of an essential part showing when the circuit breaker shown in FIG. 1 is in an off state or a trip operation state.
FIG. 4 is a perspective view showing a movable contact of the circuit breaker according to the first embodiment of the present invention.
FIG. 5 is a perspective view showing a fixed conductor and a sandwiching connection conductor of the circuit breaker according to Embodiment 1 of the present invention.
FIG. 6 is a perspective view showing a movable contact portion according to the first embodiment of the present invention.
FIG. 7 is a cutaway side view of a main part of a circuit breaker according to a second embodiment of the present invention, showing a state where the movable contact is repelled.
8 is a cutaway side view of an essential part showing when the circuit breaker shown in FIG. 7 is in an ON state. FIG.
FIG. 9 is a perspective view showing a movable contact of a circuit breaker according to Embodiment 2 of the present invention.
FIG. 10 is a perspective view showing a movable contact portion of a circuit breaker according to Embodiment 2 of the present invention.
FIG. 11 is a perspective view showing a movable contact portion of a circuit breaker that is Embodiment 3 of the present invention.
12 is a cross-sectional view taken along a yoke portion in FIG. 11. FIG.
FIG. 13 is a perspective view showing a movable contact portion of a circuit breaker that is Embodiment 4 of the present invention.
14 is a cross-sectional view taken along line EE of FIG.
FIG. 15 is an exploded perspective view showing a main part of a fourth embodiment of the present invention.
FIG. 16 is a cutaway side view of a main part showing a circuit breaker according to a fifth embodiment of the present invention, showing an ON state.
17 is a cutaway side view of the main part showing a state in which the movable contact of the circuit breaker shown in FIG. 16 has repelled.
18 is a cutaway side view of the main part showing a state in which the movable contact of the circuit breaker shown in FIG. 16 has slightly bounced from the repulsion operation position.
FIG. 19 is a cutaway side view of a main part of the circuit breaker shown in FIG. 16 showing an off state or a trip operation state.
FIG. 20 is a perspective view showing a movable contact portion of a circuit breaker according to a fifth embodiment of the present invention.
21 is an enlarged side view showing a movable contact portion of the circuit breaker shown in FIG.
FIG. 22 is an exploded perspective view of a movable contact portion of a circuit breaker according to a fifth embodiment of the present invention.
FIG. 23 is a cutaway side view showing a main part of a circuit breaker according to a sixth embodiment of the present invention, showing a state where the movable contact is repelled by a relatively small overcurrent.
FIG. 24 is a side view showing a movable contact portion of a circuit breaker according to Embodiment 6 of the present invention.
FIG. 25 is a side view showing a movable contact of a circuit breaker according to Embodiment 6 of the present invention.
FIG. 26 is a perspective view showing a movable contact portion of a circuit breaker according to a seventh embodiment of the present invention.
FIG. 27 is a cross-sectional view taken along the line area in FIG.
FIG. 28 is an exploded perspective view of a movable contact portion of a circuit breaker according to a seventh embodiment of the present invention.
FIG. 29 is a fragmentary cutaway side view showing a circuit breaker according to an eighth embodiment of the present invention, showing an on state.
30 is a cutaway side view of an essential part showing a state in which the movable contact of the circuit breaker shown in FIG. 29 has repelled.
FIG. 31 is an exploded perspective view showing a movable contact portion according to an eighth embodiment of the present invention.
FIG. 32 is a perspective view showing a movable iron piece according to an eighth embodiment of the present invention.
FIG. 33 is a front view showing a movable contact portion of a conventional circuit breaker.
FIG. 34 is a side view showing a movable contact portion of a conventional circuit breaker.
[Explanation of symbols]
1 fixed contact, 2 fixed contact, 4 movable contact, 5 crossbar,
9 rotation axis,
13, 23, 33, 53, 63, 73, 83, 93 movable contacts,
13b, 23b, 33b, 53b, 63b, 83b braking part,
15 Housing, 16 Fixed conductor, 17, 37 Holding connection conductor,
30, 40, 65, 85 Yoke, 41 Plunger, 66 Movable iron piece
73b first braking action part, 73c second braking action part, 87 push spring,
95 suction iron pieces, 97 fixed iron pieces.

Claims

A toggle link mechanism connected to a tilting operation handle, a crossbar connected to the toggle link mechanism and rotated by the operation of the toggle link mechanism, a movable contact at one end, and the like A movable contact that is pivotally supported in the crossbar so that the end can be rotated and that opens and closes in conjunction with the rotation of the crossbar, and a fixed contact between the movable contact and the movable contact. A circuit breaker provided with a fixed contact at one end, wherein the movable contact is electromagnetically repelled and separated when a large current flows through the contact; at the other end of the movable contact A projecting braking action part, and a sandwiching connecting conductor formed in a bifurcated shape, sandwiching the braking action part from both sides and energizing the movable contact, and the movable contact is electromagnetically repulsive Separated Can, braking action of the movable contactor to form the braking action portion to pivot to the position to be clamped to the clamping connecting conductors, when the electromagnetic repulsion, an electromagnetic based on current flowing through the clamping connecting conductors A circuit breaker characterized in that the holding connecting conductor presses the braking action portion by force .

A toggle link mechanism connected to a tilting operation handle, a crossbar connected to the toggle link mechanism and rotated by the operation of the toggle link mechanism, a movable contact at one end, and the like A movable contact that is pivotally supported in the crossbar so that the end can be rotated and that opens and closes in conjunction with the rotation of the crossbar, and a fixed contact between the movable contact and the movable contact. A circuit breaker provided with a fixed contact at one end, wherein the movable contact is electromagnetically repelled and separated when a large current flows through the contact; at the other end of the movable contact A projecting braking action part, and a sandwiching connecting conductor formed in a bifurcated shape, sandwiching the braking action part from both sides and energizing the movable contact, and the movable contact is electromagnetically repulsive. Separated Can, braking action of the movable contactor to form the braking action portion to pivot to a position past the clamping connecting conductors, when the electromagnetic repulsion, an electromagnetic force based on a current flowing through the clamping connecting conductors the clamping connection by narrowing the spacing of conductors, circuits breakers characterized by being configured to lock the braking action portion that pivoting by.

3. The circuit breaker according to claim 1, further comprising a yoke made of a magnetic material so as to surround an outer periphery of the sandwiched connection conductor.

When the movable contact is separated from the electromagnetic repulsion, the braking action portion is formed so that the braking action portion of the movable contact is rotated to a position past the sandwiching connection conductor. 4. The circuit breaker according to claim 3 , wherein an electromagnetic force based on an electric current is configured to press a braking action portion at a position where one end of the yoke passes the position.

When the movable contact is separated from the electromagnetic repulsion, the braking action part is formed so that the braking action part of the movable contact rotates slightly away from the sandwiched connection conductor, and the yoke projects in the direction of the braking action part. A plunger configured so as to be able to be provided, and when the electromagnetic repulsion occurs, the plunger protrudes by an electromagnetic force based on a current flowing through the holding connection conductor, and is configured to lock a braking action portion rotated. The circuit breaker according to claim 3 .

When the movable contact is separated from the electromagnetic repulsion, the braking action part is formed so that the braking action part of the movable contact rotates slightly away from the sandwiched connection conductor, and is opposed to the end face on the opening side of the yoke. When the movable contact is separated from the electromagnetic repulsion, the movable iron piece is attracted to the yoke by the electromagnetic force based on the current flowing through the sandwiched connecting conductor, and the movable iron piece is rotated. The circuit breaker according to claim 3 , wherein the brake action portion is configured to be locked.

By providing the second braking action part on the movable contact, the movable iron piece is configured to lock the second braking action part when the movable contact is electromagnetically repelled and released by a small overcurrent. The circuit breaker according to claim 6 .

A toggle link mechanism connected to a tilting operation handle, a crossbar connected to the toggle link mechanism and rotated by the operation of the toggle link mechanism, a movable contact at one end, and the like A movable contact that is pivotally supported in the crossbar so that the end can be rotated and that opens and closes in conjunction with the rotation of the crossbar, and a fixed contact between the movable contact and the movable contact. A circuit breaker provided with a fixed contact at one end, wherein the movable contact is electromagnetically repelled and separated when a large current flows through the contact; at the other end of the movable contact A projecting braking action part, and a sandwiching connecting conductor formed in a bifurcated shape, sandwiching the braking action part from both sides and energizing the movable contact, and the movable contact is electromagnetically repulsive. Separated Can, together with the braking action of the movable contactor to form the braking action portion to pivot to a position past the clamping connecting conductors, a pair of movable made of a magnetic material on both sides of the clamping connection conductor When a yoke is provided and the electromagnetic repulsion is separated, the pair of movable yokes are attracted so as to surround the sandwiched connection conductor by electromagnetic force based on the current flowing through the sandwiched connection conductor, and the rotated braking action portion is engaged. circuitry breaker characterized by being configured so as to stop.