JP3640169B2

JP3640169B2 - Circuit breaker trip device

Info

Publication number: JP3640169B2
Application number: JP2001017740A
Authority: JP
Inventors: 満富田; 孝北村
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2001-01-26
Filing date: 2001-01-26
Publication date: 2005-04-20
Anticipated expiration: 2021-01-26
Also published as: JP2002222624A

Description

【０００１】
【発明の属する技術分野】
本発明は、過電流による電磁吸引力で固定鉄心に可動鉄心を吸引して主接点を強制的に開極することにより回路遮断器を開放する回路遮断器の引外し装置に関するものである。
【０００２】
【従来の技術】
従来の回路遮断器の引外し装置として、例えば特開平８−９６６８９号公報に記載されたものがある。上記公報に記載されている引外し装置は、図８に示すようにＵ字溝３１ｃとストッパ３１ａを有する非磁性材料製の固定部材３１に固定鉄心３０を固定し、Ｕ字溝３１ｃに可動鉄心３９を枢支するとともにＵ字溝３１ｃの底面とストッパ３１ａに対して、可動鉄心３９の枢支点に装着され且つ固定部材３１に設けたばね引掛部３１ｂに引っ掛けたばね４０によって常時圧接するように構成されている。
【０００３】
上記従来例では、固定鉄心３０と可動鉄心３９とを固定部材３１を介して一体に組み立てているため、固定鉄心３０及び可動鉄心３９間の空隙が一定となり、吸引特性を安定させることができるものである。
【０００４】
【発明が解決しようとする課題】
しかしながら、上記従来例においては、可動鉄心３９を回動自在に枢支するＵ字溝３１ｃを中心として固定部材３１の長手方向両端部にばね引掛部３１ｂとストッパ３１ａを形成しているため、固定部材３１の長手方向の寸法が大きくなり、固定部材が大型化してしまうという問題があった。
【０００５】
本発明は上記問題に鑑みて為されたものであり、その目的とするところは、小型化が図れる回路遮断器の引外し装置を提供することにある。
【０００６】
【課題を解決するための手段】
請求項１の発明は、上記目的を達成するために、過電流による電磁吸引力で固定鉄心に可動鉄心を吸引して主接点を強制的に開極することにより回路遮断器を開放する引外し装置であって、回路遮断器に固定される固定鉄心と、非磁性材料からなり、固定鉄心に回動自在に支持されるとともに固定鉄心に当接して回動が規制されるストッパを有する固定部材と、固定鉄心と対向するように固定部材に固定された可動鉄心と、固定鉄心と固定部材との間に装着されて固定部材のストッパが固定鉄心に当接する方向に固定部材を付勢する圧縮ばねからなる復帰ばねとを備えた回路遮断器の引外し装置において、一端側が固定鉄心に引っ掛けて固定された復帰ばねの他端側を引っ掛けて固定するばね引掛部をストッパに形成し、固定鉄心は、固定部材の回動方向に略直交する方向に対向する一対の対向片、並びに一対の対向片を連結する連結片を具備し、固定部材は、各対向片に枢支されるとともに可動鉄心が固定される固定部材本体、並びに固定部材本体から連結片における可動鉄心との対向面と反対面側に延出されたストッパを具備し、ばね引掛部は、ストッパの延出方向と略直交する方向に突設される突起からなることを特徴とし、復帰ばねを固定するばね引掛部とストッパを固定部材における別の部位に形成する必要がなく、従来例に比較して小型化が図れるとともに固定部材の材料取りも良くなる。加えて、引張ばねに比較して復帰ばねの装着がし易く、また、ばね引掛部を容易に形成することができる。
【０００９】
請求項２の発明は、請求項１の発明において、ストッパのばね引掛部の周縁における復帰ばねとの当接部位に切り欠き部を設けたことを特徴とし、切り欠き部によって復帰ばねとばね引掛部とのかかり代が大きくなり、復帰ばねをばね引掛部から外れ難くできる。
【００１０】
請求項３の発明は、請求項１又は２の発明において、復帰ばねが内部に収められる開口部を固定鉄心の連結片に設けたことを特徴とし、復帰ばねと固定鉄心とが重なる連結片の厚み分だけ小型化が可能となる。
【００１１】
請求項４の発明は、請求項１又は２又は３の発明において、一対の対向片の対向方向における外側へ突出する段部、並びに段部よりも小径であり且つ段部よりも外側へ突出した軸部を各対向片にそれぞれ形成し、各軸部に回動自在に枢支される脚片を固定部材本体に設けたことを特徴とし、脚片間の間隔を狭くしても段部にしか当接せず、固定鉄心と固定部材との当接部位を少なくすることができる。このため、両者間の摩擦を少なくし、固定部材をスムーズに回動させることができ、もって引外し動作をスムーズに行わせることができる。
【００１２】
【発明の実施の形態】
以下、図１〜図７を参照して本発明の実施形態を説明する。
【００１３】
図７は本実施形態の引外し装置を用いる回路遮断器の一部破断した側面図であり、この回路遮断器は、入出力端子間に電気的に接続されている主接点（図示せず）を開閉する開閉機構部を合成樹脂製のハウジング２０の内部に収納しており、入出力端子間の電路に短絡電流のような過電流が流れたときに引外し装置１が動作し、引外し装置１によって開閉機構部の引外し部材２５が駆動されて引外し動作（トリップ動作）が行われて主接点が強制的に開極されるようになっている。なお、主接点の投入操作、開放操作並びにリセット操作（引外し装置１による引外し状態を解除する操作）はハウジング２０の前面に起伏自在に設けられたハンドル２４によって行なわれるようになっている。
【００１４】
主接点は入力端子に電気的に接続された固定接点（図示せず）と、導電性を有する帯状の金属板からなる可動接触子２６の長手方向一端部に固着されて固定接点に接離する可動接点（図示せず）とからなる。可動接触子２６は、長手方向他端部がハウジング２０内底面より突設された係止片２１に係止されるとともに、係止片２１に係止される端部と可動接点が固着された端部との間の部位で図示しない開閉機構部と連結されており、さらに、この連結部位と係止片２１に係止される端部との間の部位がコイルばね２２によってハウジング２０の前方（図７における上方）に付勢されている。このコイルばね２２は一端側がハウジング２０内底面の係止片２１近傍に突設されている突起２３に挿着され、他端側が可動接触子２６に当接させてある。
【００１５】
開閉機構部は主接点を開放する向き（図７における上向き）に可動接触子２６を駆動するべく弾性付勢され、ハンドル２４の投入操作によって主接点を閉極した状態（投入状態）で引外し部材２５にラッチされるラッチ部材（図示せず）を有しており、ラッチ部材が引外し部材２５にラッチされることで投入状態を保持するとともに、ハンドル２４の開放操作によって主接点を開極させて開放状態とすることができる。引外し部材２５は引外し装置１によって押駆動される駆動片２５ａと、駆動片２５ａの下端部から駆動片２５ａに略直交する向きに突出するラッチ片２５ｂとが一体に形成され、駆動片２５ａの下端部に形成された軸受け部２５ｃに挿通された回動軸（図示せず）を支点として回動自在に配設されるとともに、軸受け部２５ｃの周囲に装着された鋏形ばね（図示せず）によってラッチ片２５ｂがラッチ部材と当接してラッチする向き（図７における時計回り）に付勢されている。なお、これ以外の開閉機構部の構成は従来周知の技術を用いて実現可能であるから、図示並びに詳細な説明は省略する。而して、主接点が閉極された状態（投入状態）で引外し装置１によって駆動片２５ａが押駆動されると、引外し部材２５が図７における反時計回りに回動してラッチ片２５ｂとラッチ部材とのラッチが外れ、コイルばね２２等のばね力によって可動接触子２６が図７における上方へ移動して主接点が強制的に開極される。
【００１６】
引外し装置１は、図１及び図２に示すようにハウジング２０に固定される固定鉄心２と、固定鉄心２に回動自在に支持される固定部材３と、固定鉄心２と対向するように固定部材３に固定された可動鉄心４と、固定鉄心２と固定部材３との間に装着されて固定部材３のストッパ３ｄが固定鉄心２に当接する方向に固定部材３を付勢する復帰ばね５とを備える。
【００１７】
固定鉄心２は磁性材料製であって、略Ｌ字形に形成されて互いに対向する一対の対向片２ａ，２ａと、先端側で２つの対向片２ａ，２ａを連結する連結片２ｂと、連結片２ｂの後端側に段差を介して突出する接続片２ｃと、連結片２ｂの側縁より対向片２ａと反対方向に突出し且つ取付用のねじ孔２ｅを有する取付片２ｄとが一体に形成されている。また、連結片２ｂには、後述するように復帰ばね５が内部に収められる略矩形の開口部２ｆが形成されるとともに、開口部２ｆの先端側内周縁には復帰ばね５の端部が挿着して引っ掛けられるばね受け突起２ｇが形成される。さらに、一対の対向片２ａの対向方向における外側へ突出する略円筒形の段部２ｈ、並びに段部２ｈよりも小径であり且つ段部２ｈよりも外側へ突出した略円筒形の軸部２ｉが各対向片２ａの先端部に形成されている。
【００１８】
可動鉄心４は磁性材料によって矩形平板状に形成されており、固定部材３にかしめ固定するための一対の固定突起４ａ，４ａが長手方向に沿って突設されている。固定部材３は非磁性材料製であって、可動鉄心４が固定される矩形平板状の固定部材本体３ａと、固定部材本体３ａの長手方向に対向する両端縁より略直角に折曲された一対の脚片３ｂ，３ｂと、片方の脚片３ｂの一端縁（図２及び図３における下端縁）から延出された略Ｌ字形のストッパ３ｄと、同じ脚片３ｂの他端縁（図２及び図３における上端縁）から延出された腕片３ｆとが一体に形成されている。固定部材本体３ａには可動鉄心４の固定突起４ａ，４ａを挿通する２つの挿通孔３ｅ，３ｅが長手方向に沿って穿孔されており、挿通孔３ｅ，３ｅに挿通した固定突起４ａ，４ａの先端をかしめることで可動鉄心４が固定部材本体３ａにかしめ固定される。２つの脚片３ｂ，３ｂには下端に開放し且つ上端縁を略円弧形とした軸受け溝３ｃ，３ｃが形成されている。而して、この軸受け溝３ｃ，３ｃに固定鉄心２の対向片２ａ，２ａ先端部に形成されている軸部２ｉ，２ｉを挿通することにより固定部材３の脚片３ｂ，３ｂが軸部２ｉ，２ｉに枢支され、固定部材３が固定鉄心２に対して軸部２ｉ，２ｉの回りに回動自在に取り付けられる。このとき、脚片３ｂと固定鉄心２の対向片２ａとの間には段部２ｈが介在するため、脚片３ｂ，３ｂ間の間隔を狭くしても段部２ｈ，２ｈにしか当接せず、固定鉄心２と固定部材３との当接部位を少なくすることができ、このため、両者間の摩擦を少なくし、固定部材３をスムーズに回動させることができる。
【００１９】
ストッパ３ｄは固定部材本体３ａから離れるにつれて下方へ傾斜するとともに先端側が固定部材本体３ａと対向するように略Ｌ字形に形成されている。ストッパ３ｄの固定部材本体３ａと対向する先端部には、ストッパ３ｄの延出方向と略直交する方向（図２及び図３における上方向）に突出する突起からなり、復帰ばね５の端部が引掛固定されるばね引掛部３ｈが形成されている。ここで、ばね引掛部３ｈをストッパ３ｄの延出方向と略直交する方向に突設される突起で構成しているため、ばね引掛部３ｈを容易に形成することができるという利点がある。
【００２０】
腕片３ｆは脚片３ｂの上端縁から固定部材本体３ａと略平行な上向きに突設されており、その先端部にはストッパ３ｄの延出方向と反対方向に突出する押圧突起３ｇが形成されている。
【００２１】
而して、上述のように軸受け溝３ｃ，３ｃに固定鉄心２の対向片２ａ，２ａの軸部２ｉ，２ｉを挿通して固定部材３を固定鉄心２に対して軸部２ｉ，２ｉの回りに回動自在に取り付けると、図４に示すように固定部材本体３ａに固定された可動鉄心４が固定鉄心２と対向配置されるとともに、ストッパ３ｄの先端部が固定鉄心２の背面（連結片２ｂの対向片２ａが突出する側を正面としたときの反対側の面）に対向し、且つストッパ３ｄの先端部に形成されたばね引掛部３ｈが固定鉄心２の連結片２ｂに設けられた開口部２ｆの近傍に配置される。そして、圧縮ばねからなる復帰ばね５の両端部がそれぞれ連結片２ｂに設けたばね受け突起２ｇ並びにばね引掛部３ｈに挿着され、この復帰ばね５のばね力により、腕片３ｆ先端の押圧突起３ｇが固定鉄心２に近づく回動方向に固定部材３が付勢されるとともに、ストッパ３ｄが固定鉄心２の連結片２ｂに当接することで固定部材３の回動が規制される。ここで、復帰ばね５を圧縮ばねとしているので、引張ばねに比較して復帰ばね５の装着がし易いという利点がある。また、ストッパ３ｄのばね引掛部３ｈの周縁における復帰ばね５との当接部位に略Ｕ字形の切り欠き部３ｉが設けてあるため、切り欠き部３ｉによって復帰ばね５とばね引掛部３ｄとのかかり代が大きくなり、復帰ばね５をばね引掛部３ｄから外れ難くできるという利点もある。さらに、復帰ばね５が内部に収められる開口部２ｆが固定鉄心２の連結片２ｂに設けてあるので、復帰ばね５と固定鉄心２とが重なる連結片２ｂの厚み分だけ引外し装置１の小型化が可能になるという利点がある。
【００２２】
ところで、図３及び図４に示すように固定鉄心２と固定部材３に囲まれた空間には固定鉄心２と可動鉄心４に対向するようにバイメタル６が配設される。バイメタル６は長尺の矩形板状に形成され、下端部が固定鉄心２の接続片２ｃに接続されて対向片２ａ，２ａの間に挿通される。また、バイメタル６の上端部にはバイメタル６の湾曲方向に貫通するねじ孔６ａが形成されており、このねじ孔６ａに調整ねじ６ｂが螺合させてある。さらに、図７に示すようにバイメタル６の中間部が編組線からなる接続線７を介して出力端子に接続されるとともに、バイメタル６の下端部が同じく編組線からなる接続線８を介して可動接触子２６に接続されている。したがって、主接点が閉極した状態（投入状態）では入力端子−主接点−可動接触子２６−バイメタル６−出力端子という経路で電流が流れる主回路（主通電電路）が形成される。なお、バイメタル６と出力端子を接続する接続線７は、図７に示すようにハウジング２０の右端部に収納されている零相変流器ＣＴのトロイダルコアの貫通孔に挿通されており、本実施形態における回路遮断器においては零相変流器ＣＴによって上記主回路に流れる漏洩電流や地絡電流等の漏電電流を検出し、漏電電流が検出された場合に図示しない電磁釈放装置によって開閉機構部の引外し部材２５が駆動されて引外し動作が行われ、主接点が強制的に開極されるようになっている。
【００２３】
上述のように構成される本実施形態の引外し装置１は、図７に示すようにハウジング２０の底面から突設された取付台２７上に固定鉄心２の取付片２ｄを載置し、取付台２７の天面に開口するねじ挿通孔２７ａにハウジング２０の底面外側から挿通した固定ねじ２８を取付片２ｄのねじ孔２ｅに螺合することによって、ハウジング２０内部の定位置に固定される。このとき、固定鉄心２の接続片２ｃはハウジング２０底面の係止片２１と取付台２７との間に生じる空間に収納される（図７参照）。また、引外し装置１を上記定位置に固定した状態では、図５に示すように固定部材３の腕片３ｆに設けた押圧突起３ｇと、バイメタル６の調整ねじ６ｂとが引外し部材２５の駆動片２５ａに対向することになる。
【００２４】
而して、主接点が閉極した状態で入出力端子間に通電するとバイメタル６に流れる電流によって磁界が発生し、固定鉄心２並びに可動鉄心４を通る磁路の磁気抵抗を小さくするように可動鉄心４に対して固定鉄心２との間で吸引力（電磁吸引力）が作用するのであって、バイメタル６の通過電流が短絡電流のような過大な電流であると、図６に示すように復帰ばね５のばね力に抗して可動鉄心４が固定鉄心２に近づくように、すなわち図６においては反時計回りに固定部材３が回動し、腕片３ｆの押圧突起３ｇで駆動片２５ａを押駆動して引外し部材２５を図６における反時計回りに回動させて主接点を強制的に開極させるようになっている。
【００２５】
一方、バイメタル６の通過電流が、過負荷電流のような短絡電流よりも低いが回路遮断器の定格電流よりも大きい電流であると、過電流による熱によってバイメタル６が湾曲し、バイメタル６の上端部に螺合されている調整ねじ６ｂの先端部で引外し部材２５の駆動片２５ａを押駆動することにより、引外し部材２５を図６における反時計回りに回動させて主接点を強制的に開極させるようになっている。ここで、バイメタル６は通過電流に対する湾曲の程度（動作感度）が、バイメタル６の素材のばらつきや接続線７，８の接続位置などによって変化するから、開閉機構部の動作感度（すなわち、開閉機構部が引外し動作するときの主回路の通過電流）がばらつかないようにするためには、バイメタル６に螺合している調整ねじ６ｂの引外し部材２５側へのバイメタル６からの突出量を調整すればよい。
【００２６】
本実施形態の引外し装置１は上述のように構成したものであり、一端側が固定鉄心２に引っ掛けて固定された復帰ばね５の他端側を引っ掛けて固定するばね引掛部３ｈをストッパ３ｄに形成しているので、復帰ばね５を固定するばね引掛部３ｈとストッパ３ｄを固定部材３における別の部位に形成する必要がなく、従来例に比較して小型化が図れるとともに固定部材３の材料取りも良くなるという利点がある。
【００２７】
【発明の効果】
請求項１の発明は、過電流による電磁吸引力で固定鉄心に可動鉄心を吸引して主接点を強制的に開極することにより回路遮断器を開放する引外し装置であって、回路遮断器に固定される固定鉄心と、非磁性材料からなり、固定鉄心に回動自在に支持されるとともに固定鉄心に当接して回動が規制されるストッパを有する固定部材と、固定鉄心と対向するように固定部材に固定された可動鉄心と、固定鉄心と固定部材との間に装着されて固定部材のストッパが固定鉄心に当接する方向に固定部材を付勢する圧縮ばねからなる復帰ばねとを備えた回路遮断器の引外し装置において、一端側が固定鉄心に引っ掛けて固定された復帰ばねの他端側を引っ掛けて固定するばね引掛部をストッパに形成し、固定鉄心は、固定部材の回動方向に略直交する方向に対向する一対の対向片、並びに一対の対向片を連結する連結片を具備し、固定部材は、各対向片に枢支されるとともに可動鉄心が固定される固定部材本体、並びに固定部材本体から連結片における可動鉄心との対向面と反対面側に延出されたストッパを具備し、ばね引掛部は、ストッパの延出方向と略直交する方向に突設される突起からなるので、復帰ばねを固定するばね引掛部とストッパを固定部材における別の部位に形成する必要がなく、従来例に比較して小型化が図れるとともに固定部材の材料取りも良くなるという効果がある。加えて、引張ばねに比較して復帰ばねの装着がし易いという効果があり、また、ばね引掛部を容易に形成することができるという効果がある。
【００３０】
請求項２の発明は、請求項１の発明において、ストッパのばね引掛部の周縁における復帰ばねとの当接部位に切り欠き部を設けたので、切り欠き部によって復帰ばねとばね引掛部とのかかり代が大きくなり、復帰ばねをばね引掛部から外れ難くできるという効果がある。
【００３１】
請求項３の発明は、請求項１又は２の発明において、復帰ばねが内部に収められる開口部を固定鉄心の連結片に設けたので、復帰ばねと固定鉄心とが重なる連結片の厚み分だけ小型化が可能となるという効果がある。
【００３２】
請求項４の発明は、請求項１又は２又は３の発明において、一対の対向片の対向方向における外側へ突出する段部、並びに段部よりも小径であり且つ段部よりも外側へ突出した軸部を各対向片にそれぞれ形成し、各軸部に回動自在に枢支される脚片を固定部材本体に設けたので、脚片間の間隔を狭くしても段部にしか当接せず、固定鉄心と固定部材との当接部位を少なくすることができ、このため、両者間の摩擦を少なくし、固定部材をスムーズに回動させることができ、もって引外し動作をスムーズに行わせることができるという効果がある。
【図面の簡単な説明】
【図１】本発明の実施形態を示す分解斜視図である。
【図２】同上の他の方向から見た分解斜視図である。
【図３】同上の斜視図である。
【図４】同上の他の方向から見た斜視図である。
【図５】同上の動作していない状態の側面図である。
【図６】同上の動作した状態の側面図である。
【図７】同上を用いた回路遮断器を示す一部破断した側面図である。
【図８】従来例を示す分解斜視図である。
【符号の説明】
１引外し装置
２固定鉄心
２ａ対向片
２ｂ連結片
２ｇばね受け突起
３固定部材
３ｄストッパ
３ｇ押圧突起
４可動鉄心
５復帰ばね[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tripping device for a circuit breaker that opens a circuit breaker by attracting a movable iron core to a fixed iron core with an electromagnetic attraction force due to overcurrent to forcibly open a main contact.
[0002]
[Prior art]
As a conventional circuit breaker tripping device, for example, there is one disclosed in JP-A-8-96689. As shown in FIG. 8, the tripping device described in the above publication fixes a fixed iron core 30 to a fixed member 31 made of a nonmagnetic material having a U-shaped groove 31c and a stopper 31a, and a movable iron core to the U-shaped groove 31c. 39 is pivotally supported and is always in pressure contact with the bottom surface of the U-shaped groove 31c and the stopper 31a by a spring 40 attached to a pivot point of the movable iron core 39 and hooked on a spring hook 31b provided on the fixed member 31. ing.
[0003]
In the above conventional example, since the fixed iron core 30 and the movable iron core 39 are integrally assembled via the fixed member 31, the gap between the fixed iron core 30 and the movable iron core 39 is constant, and the suction characteristics can be stabilized. It is.
[0004]
[Problems to be solved by the invention]
However, in the above-described conventional example, the spring hooking portion 31b and the stopper 31a are formed at both longitudinal ends of the fixing member 31 around the U-shaped groove 31c that pivotally supports the movable iron core 39. There was a problem that the dimension of the longitudinal direction of the member 31 became large and the fixing member was enlarged.
[0005]
The present invention has been made in view of the above problems, and an object thereof is to provide a tripping device for a circuit breaker that can be reduced in size.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is a tripping device that opens a circuit breaker by forcibly opening a main contact by attracting a movable iron core to a fixed iron core by electromagnetic attraction caused by overcurrent. A fixed member comprising a fixed iron core fixed to a circuit breaker and a non-magnetic material and having a stopper that is rotatably supported by the fixed iron core and is in contact with the fixed iron core and is restricted from rotating. And a movable iron core fixed to the fixed member so as to face the fixed iron core, and a compression that is mounted between the fixed iron core and the fixed member so that the stopper of the fixed member abuts the fixed iron core In a tripping device for a circuit breaker comprising a return spring comprising a spring, a spring hooking portion is formed on the stopper for fixing the other end side of the return spring that is fixed by hooking one end side to the fixed iron core. The fixed part A pair of facing pieces that oppose each other in a direction substantially orthogonal to the rotation direction, and a connecting piece that connects the pair of facing pieces, and the fixing member is pivotally supported by each facing piece and the movable iron core is fixed. The fixed member main body and a stopper extending from the fixed member main body to the surface opposite to the surface facing the movable core of the connecting piece are provided, and the spring hooking portion protrudes in a direction substantially orthogonal to the extending direction of the stopper. It is not necessary to form a spring hook and a stopper for fixing the return spring in different parts of the fixing member, and it is possible to reduce the size of the fixing member and to remove the material of the fixing member. Also gets better. In addition, the return spring can be easily mounted compared to the tension spring, and the spring hooking portion can be easily formed.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, a notch portion is provided in a contact portion with the return spring at the periphery of the spring hook portion of the stopper, and the return spring and the spring hook are provided by the notch portion. The engagement allowance with the portion increases, and the return spring can be made difficult to come off from the spring hooking portion.
[0010]
The invention of claim 3 is characterized in that, in the invention of claim 1 or 2 , an opening for accommodating the return spring is provided in the connection piece of the fixed core, and the connection piece of the return spring and the fixed core overlaps. The size can be reduced by the thickness.
[0011]
According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, the pair of opposed pieces projecting outward in the facing direction, and having a smaller diameter than the step and projecting outward from the step. A shaft portion is formed on each opposing piece, and a leg piece pivotally supported by each shaft portion is provided on the fixed member body. Even if the interval between the leg pieces is narrowed, the step portion is provided. However, the contact portion between the fixed iron core and the fixed member can be reduced. For this reason, the friction between both can be reduced, the fixing member can be smoothly rotated, and the tripping operation can be performed smoothly.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
[0013]
FIG. 7 is a partially broken side view of a circuit breaker using the tripping device of the present embodiment, and this circuit breaker is a main contact (not shown) electrically connected between the input and output terminals. The opening / closing mechanism that opens and closes the housing is housed in the housing 20 made of synthetic resin. When an overcurrent such as a short-circuit current flows in the electric circuit between the input and output terminals, the tripping device 1 operates and trips. The trip member 25 of the opening / closing mechanism section is driven by the device 1 to perform a trip operation (trip operation) so that the main contact is forcibly opened. The main contact opening operation, the opening operation, and the resetting operation (operation for releasing the tripping state by the tripping device 1) are performed by a handle 24 provided on the front surface of the housing 20 so as to be freely raised and lowered.
[0014]
The main contact is fixedly connected to the fixed contact (not shown) electrically connected to the input terminal and one end in the longitudinal direction of the movable contact 26 made of a conductive belt-like metal plate, and is brought into contact with and separated from the fixed contact. It consists of a movable contact (not shown). The movable contact 26 is locked to a locking piece 21 projecting from the inner bottom surface of the housing 20 at the other end in the longitudinal direction, and the end locked to the locking piece 21 and the movable contact are fixed. An opening / closing mechanism portion (not shown) is connected to a portion between the end portion and a portion between the connecting portion and the end portion locked by the locking piece 21 is connected to the front of the housing 20 by a coil spring 22. (Upward in FIG. 7) is urged. One end of the coil spring 22 is inserted into a protrusion 23 projecting near the locking piece 21 on the inner bottom surface of the housing 20, and the other end is in contact with the movable contact 26.
[0015]
The opening / closing mechanism is elastically biased to drive the movable contact 26 in the direction to open the main contact (upward in FIG. 7), and trips in a state in which the main contact is closed by the closing operation of the handle 24 (closed state). A latch member (not shown) latched by the member 25 is held. The latch member is latched by the tripping member 25 to maintain the closing state, and the main contact is opened by opening the handle 24. Can be opened. The tripping member 25 is integrally formed with a driving piece 25a that is pushed and driven by the tripping device 1 and a latch piece 25b that protrudes from the lower end of the driving piece 25a in a direction substantially perpendicular to the driving piece 25a. A hook-shaped spring (not shown) is disposed around the bearing portion 25c and is rotatably arranged with a turning shaft (not shown) inserted through a bearing portion 25c formed at the lower end of the bearing portion 25c as a fulcrum. The latch piece 25b is urged in a direction (clockwise in FIG. 7) in which the latch piece 25b comes into contact with and latches the latch member. In addition, since the structure of the opening / closing mechanism part other than this is realizable using a conventionally well-known technique, illustration and detailed description are abbreviate | omitted. Thus, when the driving piece 25a is pushed and driven by the tripping device 1 with the main contact closed (closed state), the tripping member 25 rotates counterclockwise in FIG. The latch between 25b and the latch member is released, and the movable contact 26 moves upward in FIG. 7 by the spring force of the coil spring 22 or the like, so that the main contact is forcibly opened.
[0016]
As shown in FIGS. 1 and 2, the tripping device 1 has a fixed iron core 2 fixed to the housing 20, a fixing member 3 rotatably supported by the fixed iron core 2, and the fixed iron core 2. A movable iron core 4 fixed to the fixed member 3, and a return spring that is mounted between the fixed iron core 2 and the fixed member 3 and biases the fixed member 3 in a direction in which the stopper 3 d of the fixed member 3 contacts the fixed iron core 2. 5.
[0017]
The fixed iron core 2 is made of a magnetic material, and is formed in a substantially L shape and faces each other, a pair of facing pieces 2a, 2a, a connecting piece 2b that connects the two facing pieces 2a, 2a on the tip side, and a connecting piece A connecting piece 2c protruding through a step on the rear end side of 2b and a mounting piece 2d protruding in a direction opposite to the opposing piece 2a from the side edge of the connecting piece 2b and having a screw hole 2e for mounting are integrally formed. ing. Further, as will be described later, the connection piece 2b is formed with a substantially rectangular opening 2f in which the return spring 5 is housed, and the end of the return spring 5 is inserted into the inner peripheral edge on the front end side of the opening 2f. A spring receiving projection 2g to be hooked is formed. Furthermore, a substantially cylindrical step 2h that protrudes outward in the facing direction of the pair of opposing pieces 2a, and a substantially cylindrical shaft portion 2i that has a smaller diameter than the step 2h and protrudes outward from the step 2h. It is formed in the front-end | tip part of each opposing piece 2a.
[0018]
The movable iron core 4 is formed in a rectangular flat plate shape with a magnetic material, and a pair of fixed projections 4a and 4a for caulking and fixing to the fixed member 3 are provided along the longitudinal direction. The fixed member 3 is made of a non-magnetic material, and has a rectangular flat plate-shaped fixed member main body 3a to which the movable iron core 4 is fixed, and a pair bent at a substantially right angle from both ends facing the longitudinal direction of the fixed member main body 3a. Leg pieces 3b, 3b, a substantially L-shaped stopper 3d extending from one end edge (the lower end edge in FIGS. 2 and 3) of one leg piece 3b, and the other end edge of the same leg piece 3b (FIG. 2). And the arm piece 3f extended from the upper end edge in FIG. 3 is integrally formed. The fixing member main body 3a has two insertion holes 3e, 3e through which the fixing protrusions 4a, 4a of the movable iron core 4 are inserted along the longitudinal direction, and the fixing protrusions 4a, 4a inserted through the insertion holes 3e, 3e. The movable iron core 4 is caulked and fixed to the fixed member main body 3a by caulking the tip. The two leg pieces 3b, 3b are formed with bearing grooves 3c, 3c that open to the lower ends and have upper end edges that are substantially arc-shaped. Thus, by inserting the shaft portions 2i, 2i formed at the front ends of the opposing pieces 2a, 2a of the fixed iron core 2 into the bearing grooves 3c, 3c, the leg pieces 3b, 3b of the fixing member 3 become the shaft portions 2i. , 2i, and a fixed member 3 is attached to the fixed core 2 so as to be rotatable around the shaft portions 2i, 2i. At this time, since the step portion 2h is interposed between the leg piece 3b and the opposing piece 2a of the fixed iron core 2, even if the interval between the leg pieces 3b and 3b is narrowed, the step piece 2h is brought into contact with only the step portions 2h and 2h. Therefore, the contact portion between the fixed iron core 2 and the fixing member 3 can be reduced, and therefore, the friction between the both can be reduced and the fixing member 3 can be smoothly rotated.
[0019]
The stopper 3d is formed in a substantially L shape so that the stopper 3d is inclined downward as it is away from the fixing member main body 3a and the front end side faces the fixing member main body 3a. The distal end portion of the stopper 3d facing the fixing member main body 3a is formed of a protrusion that protrudes in a direction substantially perpendicular to the extending direction of the stopper 3d (upward in FIGS. 2 and 3). A spring hook portion 3h to be hooked and fixed is formed. Here, since the spring hooking portion 3h is constituted by a protrusion protruding in a direction substantially orthogonal to the extending direction of the stopper 3d, there is an advantage that the spring hooking portion 3h can be easily formed.
[0020]
The arm piece 3f protrudes upward from the upper end edge of the leg piece 3b so as to be substantially parallel to the fixing member main body 3a, and a pressing protrusion 3g protruding in the direction opposite to the extending direction of the stopper 3d is formed at the tip. ing.
[0021]
Thus, as described above, the shaft portions 2i, 2i of the opposing pieces 2a, 2a of the fixed iron core 2 are inserted into the bearing grooves 3c, 3c, and the fixing member 3 is rotated around the shaft portions 2i, 2i with respect to the fixed iron core 2. 4, the movable iron core 4 fixed to the fixing member main body 3a is disposed to face the fixed iron core 2 as shown in FIG. 4, and the tip of the stopper 3d is connected to the back surface of the fixed iron core 2 (the connecting piece). 2b is an opening provided on the connecting piece 2b of the fixed iron core 2 and a spring hooking portion 3h formed on the tip of the stopper 3d. It arrange | positions in the vicinity of the part 2f. Then, both end portions of the return spring 5 made of a compression spring are inserted into the spring receiving projection 2g and the spring hooking portion 3h provided on the connecting piece 2b, respectively, and the pressing projection 3g at the tip of the arm piece 3f is caused by the spring force of the return spring 5. The fixed member 3 is urged in the rotation direction approaching the fixed iron core 2, and the rotation of the fixed member 3 is restricted by the stopper 3 d coming into contact with the connecting piece 2 b of the fixed iron core 2. Here, since the return spring 5 is a compression spring, there is an advantage that the return spring 5 can be easily mounted as compared with a tension spring. Further, since a substantially U-shaped cutout portion 3i is provided at a contact portion with the return spring 5 at the periphery of the spring hook portion 3h of the stopper 3d, the cutout portion 3i causes the return spring 5 and the spring hook portion 3d to be in contact with each other. There is also an advantage that the hook is increased and the return spring 5 can hardly be detached from the spring hooking portion 3d. Further, since the opening 2f in which the return spring 5 is accommodated is provided in the connecting piece 2b of the fixed iron core 2, the tripping device 1 is reduced in size by the thickness of the connecting piece 2b where the return spring 5 and the fixed iron core 2 overlap. There is an advantage that it becomes possible.
[0022]
By the way, as shown in FIGS. 3 and 4, a bimetal 6 is disposed in a space surrounded by the fixed iron core 2 and the fixed member 3 so as to face the fixed iron core 2 and the movable iron core 4. The bimetal 6 is formed in a long rectangular plate shape, and the lower end portion is connected to the connection piece 2c of the fixed iron core 2 and is inserted between the facing pieces 2a and 2a. Further, a screw hole 6a penetrating in the bending direction of the bimetal 6 is formed at the upper end portion of the bimetal 6, and an adjusting screw 6b is screwed into the screw hole 6a. Further, as shown in FIG. 7, the intermediate portion of the bimetal 6 is connected to the output terminal via a connecting wire 7 made of a braided wire, and the lower end portion of the bimetal 6 is movable via a connecting wire 8 also made of a braided wire. It is connected to the contact 26. Therefore, in a state where the main contact is closed (closed state), a main circuit (main energization circuit) in which current flows through a path of input terminal-main contact-movable contact 26-bimetal 6-output terminal is formed. The connection line 7 connecting the bimetal 6 and the output terminal is inserted through the through-hole of the toroidal core of the zero-phase current transformer CT housed in the right end portion of the housing 20 as shown in FIG. In the circuit breaker in the embodiment, a leakage current such as a leakage current and a ground fault current flowing in the main circuit is detected by the zero-phase current transformer CT, and when the leakage current is detected, an open / close mechanism is provided by an electromagnetic release device (not shown). The tripping member 25 is driven to perform a tripping operation so that the main contact is forcibly opened.
[0023]
As shown in FIG. 7, the tripping device 1 of the present embodiment configured as described above places the mounting piece 2d of the fixed iron core 2 on the mounting base 27 protruding from the bottom surface of the housing 20, and is mounted. The fixing screw 28 inserted from the outside of the bottom surface of the housing 20 into the screw insertion hole 27a opened on the top surface of the base 27 is screwed into the screw hole 2e of the mounting piece 2d, thereby being fixed at a fixed position inside the housing 20. At this time, the connecting piece 2c of the fixed iron core 2 is housed in a space formed between the locking piece 21 on the bottom surface of the housing 20 and the mounting base 27 (see FIG. 7). Further, in the state where the tripping device 1 is fixed at the above-mentioned fixed position, the pressing projection 3g provided on the arm piece 3f of the fixing member 3 and the adjusting screw 6b of the bimetal 6 are connected to the tripping member 25 as shown in FIG. It faces the drive piece 25a.
[0024]
Thus, when a current is passed between the input and output terminals with the main contact closed, a magnetic field is generated by the current flowing through the bimetal 6, so that the magnetic resistance of the magnetic path passing through the fixed iron core 2 and the movable iron core 4 is reduced. When an attractive force (electromagnetic attractive force) acts between the iron core 4 and the fixed iron core 2 and the passing current of the bimetal 6 is an excessive current such as a short-circuit current, as shown in FIG. The fixed member 3 rotates counterclockwise in FIG. 6 so that the movable iron core 4 approaches the fixed iron core 2 against the spring force of the return spring 5, and the driving piece 25a is pressed by the pressing protrusion 3g of the arm piece 3f. And the tripping member 25 is rotated counterclockwise in FIG. 6 to forcibly open the main contact.
[0025]
On the other hand, when the passing current of the bimetal 6 is lower than the short-circuit current such as an overload current but larger than the rated current of the circuit breaker, the bimetal 6 is bent by heat due to the overcurrent, and the upper end of the bimetal 6 is By pushing and driving the driving piece 25a of the tripping member 25 with the tip of the adjusting screw 6b that is screwed into the part, the tripping member 25 is rotated counterclockwise in FIG. It is supposed to open the pole. Here, since the degree of bending (operation sensitivity) of the bimetal 6 with respect to the passing current varies depending on variations in the material of the bimetal 6 and the connection positions of the connection lines 7 and 8, the operation sensitivity of the opening / closing mechanism section (that is, the opening / closing mechanism). In order to prevent variation in the current passing through the main circuit when the part trips, the amount of protrusion of the adjusting screw 6b screwed to the bimetal 6 from the bimetal 6 to the tripping member 25 side Can be adjusted.
[0026]
The tripping device 1 of the present embodiment is configured as described above, and a spring hooking portion 3h for hooking and fixing the other end side of the return spring 5 which is fixed by hooking one end side to the fixed iron core 2 to the stopper 3d. Since it is formed, it is not necessary to form the spring hooking portion 3h and the stopper 3d for fixing the return spring 5 in different parts of the fixing member 3, and the size can be reduced as compared with the conventional example and the material of the fixing member 3 can be achieved. There is an advantage that the removal is also improved.
[0027]
【The invention's effect】
The invention of claim 1 is a tripping device that opens a circuit breaker by attracting a movable iron core to a fixed iron core by electromagnetic attraction by overcurrent and forcibly opening a main contact, A fixed core made of a non-magnetic material, fixed to the fixed iron core, rotatably supported by the fixed iron core, and having a stopper that abuts against the fixed iron core and is restricted from rotating, and faces the fixed iron core A movable iron core fixed to the fixed member, and a return spring comprising a compression spring that is mounted between the fixed iron core and the fixed member and biases the fixed member in a direction in which the stopper of the fixed member contacts the fixed iron core. In the circuit breaker tripping device, the stopper is formed with a spring hooking portion that hooks and fixes the other end of the return spring that is hooked and fixed to the fixed iron core. Who is almost orthogonal to A pair of facing pieces facing each other, and a connecting piece for connecting the pair of facing pieces. The fixing member is pivotally supported by each facing piece and the movable core is fixed from the fixing member main body, and the fixing member main body. Since the connecting piece has a stopper extending on the opposite side of the surface facing the movable iron core, and the spring hooking portion is formed by a protrusion projecting in a direction substantially orthogonal to the extending direction of the stopper , the return spring There is no need to form a spring hooking portion and a stopper for fixing the fixing member in different parts of the fixing member, and there is an effect that the size can be reduced and the material of the fixing member can be improved as compared with the conventional example. In addition, there is an effect that it is easy to mount the return spring as compared with the tension spring, and there is an effect that the spring hooking portion can be easily formed.
[0030]
In the invention of claim 2, in the invention of claim 1 , since the notch portion is provided in the contact portion with the return spring at the periphery of the spring hook portion of the stopper, the notch portion causes the return spring and the spring hook portion to There is an effect that the hook is increased and the return spring can be hardly detached from the spring hooking portion.
[0031]
According to the invention of claim 3, in the invention of claim 1 or 2 , since the opening portion in which the return spring is accommodated is provided in the connecting piece of the fixed core, only the thickness of the connecting piece where the return spring and the fixed iron core overlap is provided. There is an effect that miniaturization becomes possible.
[0032]
According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, the pair of opposed pieces projecting outward in the facing direction, and having a smaller diameter than the step and projecting outward from the step. Since the shaft part is formed on each opposing piece and the leg piece pivotally supported by each shaft part is provided on the fixed member main body, it contacts only the step part even if the interval between the leg pieces is narrowed. Therefore, the contact portion between the fixed iron core and the fixing member can be reduced, and therefore, the friction between them can be reduced, the fixing member can be smoothly rotated, and the tripping operation can be smoothly performed. There is an effect that it can be done.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view seen from the other direction.
FIG. 3 is a perspective view of the same.
FIG. 4 is a perspective view seen from another direction of the above.
FIG. 5 is a side view showing a state where the apparatus is not operating.
FIG. 6 is a side view of the above operating state.
FIG. 7 is a partially cutaway side view showing a circuit breaker using the same.
FIG. 8 is an exploded perspective view showing a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tripping device 2 Fixed iron core 2a Opposing piece 2b Connecting piece 2g Spring receiving protrusion 3 Fixing member 3d Stopper 3g Pressing protrusion 4 Movable iron core 5 Return spring

Claims

A tripping device that opens a circuit breaker by attracting a movable iron core to a fixed iron core by electromagnetic attraction by overcurrent and forcibly opening a main contact, and a fixed iron core fixed to the circuit breaker; The fixing member is made of a non-magnetic material, is rotatably supported by the fixed iron core, and has a stopper that is in contact with the fixed iron core and whose rotation is restricted, and is fixed to the fixed member so as to face the fixed iron core. Tripping of a circuit breaker comprising a movable iron core and a return spring comprising a compression spring mounted between the stationary iron core and the stationary member and biasing the stationary member in a direction in which the stopper of the stationary member abuts the stationary iron core In the device, a spring hooking portion is formed on the stopper for hooking and fixing the other end of the return spring fixed at one end to the fixed iron core, and the fixed iron core faces in a direction substantially perpendicular to the rotation direction of the fixing member. A pair of And a fixed member that is pivotally supported by each of the opposing pieces and to which the movable iron core is fixed, and a movable iron core in the connecting piece from the fixed member main body. The circuit breaker is characterized by comprising a stopper extending on the opposite side to the surface opposite to the surface of the circuit breaker , wherein the spring hooking portion comprises a protrusion projecting in a direction substantially perpendicular to the extending direction of the stopper . Tripping device.

2. A tripping device for a circuit breaker according to claim 1, wherein a notch portion is provided at a contact portion with the return spring at the periphery of the spring hooking portion of the stopper .

Trip device according to claim 1 or 2 circuit breaker according return spring is characterized by providing a connecting piece of the fixed core opening to be included therein.

A pair of opposed pieces projecting outward in the facing direction, and a shaft portion having a smaller diameter than the stepped portion and projecting outward from the stepped portion are formed on each opposed piece, and each shaft portion is rotatable. 4. A tripping device for a circuit breaker according to claim 1, wherein a leg piece pivotally supported on the fixing member main body is provided on the fixing member main body .