JP4051896B2

JP4051896B2 - Distribution board

Info

Publication number: JP4051896B2
Application number: JP2001165633A
Authority: JP
Inventors: 剛矢野; 圭介辻村
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2001-05-31
Filing date: 2001-05-31
Publication date: 2008-02-27
Anticipated expiration: 2021-05-31
Also published as: JP2002359907A

Description

【０００１】
【発明の属する技術分野】
本発明は、箱本体内に複数のブレーカが収納された分電盤に関するものである。
【０００２】
【従来の技術】
従来の分電盤として、特開２００１−６９６２０号公報に開示されたものがある。この公報に記載の分電盤は、図１３ないし図１７に示すように、前面（図１３の手前側）が開放された箱本体１０’と、箱本体１０’の前面に取着される蓋体２０’とからなる箱体１’に、ブレーカとして１個の主幹開閉器（主幹ブレーカ）３１’および複数個の分岐開閉器（分岐ブレーカ）３２’が収納され、主幹開閉器３１’と分岐開閉器３２’とが導電バー９０ａ’，９０ｂ’，９０ｃ’を介して電気的に接続されている。主幹開閉器３１’および分岐開閉器３２’は、それぞれ開閉操作のためのハンドル３１ａ’，３２ａ’を備え、ハンドル３１ａ’，３２ａ’を前面側となるように箱本体１０’に収納されている。分岐開閉器３２’は上下２段に配列され、上下の分岐開閉器３２’の間に挟まる形で左右方向に延長された導電バー９０ａ’〜９０ｃ’が箱本体１０’に収納されている。蓋体２０’には主幹開閉器３１’のハンドル３１ａ’を操作可能とするように前面側と露出させる窓孔２１ａ’と、上段の分岐開閉器３２’のハンドル３２ａ’を操作可能とするように前面側に露出させる窓孔２１ｂ’と、下段の分岐開閉器３２’のハンドル３２ａ’を操作可能とするように前面側に露出させる窓孔２１ｃ’とが開口されている。
【０００３】
箱本体１０’は矩形状に形成された背板１１’の外周縁の全周に亘って側板１２’が前方に突設された形状に形成され、背板１１’には矩形状に開口した開口窓１３’が形成されている。
【０００４】
ところで、上述の分電盤は、主幹開閉器３１’が前面側に取り付けられた第１架台４０’と、分岐開閉器３２’が前面側に取り付けられた第２架台５０’とで構成される基板が、箱本体１０’の背板１１’に取着されている。第２架台５０’は、図１７に示すように、一対のフレーム１３０，１３０と、両フレーム１３０，１３０間に架設され固定ねじ１４１により固定される取付板１４０とを備えている。フレーム１３０，１３０と取付板１４０とはともに板金（鉄板）により形成されている。また、取付板１４０の前面側には、導電バー９０ａ’〜９０ｃ’を支持する合成樹脂成形品のバー支持部材８０’が取着され、さらに、分岐開閉器３２’を取り付けるための合成樹脂成形品からなる取付ベース１５０（図１５参照）がバー支持部材８０’と取付板１４０とに跨る形で取着されている。
【０００５】
導電バー９０ａ’〜９０ｃ’は分岐開閉器３２’を接続するために設けられており、上下２段に６個ずつの分岐開閉器３２’を配列している。分岐開閉器３２’の電源側には図１５および図１６に示すように、スリット状の３つの端子部３７ａ’，３７ｂ’，３７ｃ’が設けられており、端子部３７ａ’〜３７ｃ’のうち端子部３７ａ’には中性極の導電バー９０ａが挿入され、端子部３７ｂ’，３７ｃ’には電圧極の導電バー９０ｂ’，９０ｃ’の接続片９７’から延長された挿入端子片９７ｂ’，９７ａ’が挿入されている。つまり、分岐開閉器３２’にはいわゆるプラグイン式のものが用いられている。したがって、分岐開閉器３２’を導電バー９０ａ’〜９０ｃ’に接続する作業が容易になっている。ただし、各分岐開閉器３２’はそれぞれ各導電バー９０ａ’〜９０ｃ’のうちの２本にのみ電気的に接続され、他の１本はダミーとして扱われる。例えば、図１５に示す例では、端子部３７ａ’，３７ｃ’にのみ受け刃３５ａ’，３５ｃ’が設けられており、端子部３７ａ’に導電バー９０ａ’が接続され、端子部３７ｃ’に挿入端子片９７ａ’が接続されるが、挿入端子片９７ｂ’は端子部３７ｂ’に挿入されるだけで電気的な接続は行われていない。すなわち、各分岐開閉器３２’は、端子部３７ａ’，３７ｃ’が電源側端子となる。
【０００６】
なお、分岐開閉器３２’の負荷側には、外部から器体内に挿入された電線導体が接続される端子板と、端子板との間に電線導体を挟持する鎖錠ばねとからなるいわゆる速結端子が負荷側端子として設けられている。また、分岐開閉器３２’は、電源側端子と負荷側端子との間の電路に介挿され器体内に収納された接点と、接点の閉極状態において上記電路への通電量に応じて変形して過電流が流れると接点が強制開極するように変形するバイメタルが器体内に収納されている。
【０００７】
【発明が解決しようとする課題】
ところで、分電盤にあっては、一般的に、分岐開閉器と導電バーとの接続部や、分岐開閉器の負荷側端子（出力端子）と電線導体（出力線）との接続部などで熱が発生するが、分岐開閉器の近傍で発生した熱を素早く逃がしにくいという問題がある。ここに、分岐開閉器は、過電流時にバイメタルによって接点を強制開極させる関係上、箱体内部の熱によって引き外し特性がばらついてしまうという不具合がある。
【０００８】
特に、上述した従来構成の分電盤にあっては、分岐開閉器３２’と導電バー９０ａ’〜９０ｃ’のうちの２本とをプラグイン式（差込接続式）で接続するものであり、端子部３７ａ’〜３７ｃ’のうち端子部３７ａ’には中性極の導電バー９０ａが挿入され、端子部３７ｂ’，３７ｃ’には電圧極の導電バー９０ｂ’，９０ｃ’の接続片９７’から延長された挿入端子片９７ｂ’，９７ａ’が挿入されているので、導電バー９０ｂ’，９０ｃ’と分岐開閉器３２’との間の間隔が狭くなって、導電バー９０ａ〜９０ｃ’と分岐開閉器３２’との間に熱が蓄積されてしまい、分岐開閉器３２’の引き外し特性のばらつきが大きいという不具合があった。また、分岐開閉器３２’が上下２段に設けられているので、上下の分岐開閉器３２’の間の距離が短く、上下の分岐開閉器３２’の間の空間に熱が蓄積されやすいという不具合があった。
【０００９】
本発明は、上記事由に鑑みて為されたものであり、その目的は、ブレーカ近傍の熱を逃がしやすく、ブレーカの引き外し特性を安定化することができる分電盤を提供することにある。
【００１０】
【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、背板の周縁の全周が側板に囲まれた前面開口する箱本体と、箱本体の前面に取着される蓋体と、複数のブレーカが前面側に配置され箱本体の内部に収納される基板と、基板の背面に当接する形で配設されブレーカから基板に伝わる熱を放熱する放熱部材とを備え、前記複数のブレーカとして主幹ブレーカと主幹ブレーカの負荷側端子に接続された導電バーの延長方向に並設され電源側端子が導電バーを介して主幹ブレーカに電気的に接続された分岐ブレーカとを備え、前記放熱部材が導電バーの延長方向に直交する方向の両側で前記背板に取着されるものであって、前記背板には、前記放熱部材を取り付けるための複数の取付部が設けられ、取付部は、放熱部材を取着する位置を導電バーの延長方向で可変できるように導電バーの延長方向に並設されてなることを特徴とするものであり、ブレーカから発生する熱が基板に伝わり、基板の熱を放熱部材で素早く放熱させることができるから、ブレーカ近傍の熱を逃がしやすく、ブレーカの引き外し特性が安定する。また、前記放熱部材を取着する位置を導電バーの延長方向で可変することができるから、ブレーカの数に応じて放熱部材を取着する位置を適宜変更することができ、しかも、ブレーカの数が多い場合には、複数の位置にそれぞれ放熱部材を取着することにより、ブレーカの数が多いにも関わらずブレーカ近傍の熱を素早く逃がすことが可能になる。
【００１１】
【発明の実施の形態】
本実施形態は、図１ないし図４に示すように、１つの主幹開閉器（主幹ブレーカ）３１と複数の分岐開閉器（分岐ブレーカ）３２とを内器として箱体１の中に配置した住宅分電盤であって、分岐開閉器３２は上下２段に配置してある。箱体１は合成樹脂成形品であり矩形枠状の箱本体１０と、箱本体１０の前面側（図１における右側）に結合される蓋体２０とで構成される。
【００１２】
箱本体１０は矩形枠状に形成された背板１１の外周縁の全周に亘って側板１２が前方に突設された形状に形成され、背板１１には矩形状に開口した配線用の開口窓１３が形成される。背板１１の左右両端部にはそれぞれ上下２個の支持台１４ａ，１５ａが突設され、両支持台１４ａ，１５ａの周囲にはそれぞれ断面Ｌ字状であって矩形領域の角部をなすように配列されたガイド壁１４ｂ，１５ｂが形成される。上側の支持台１４ａには下方に隣接して背板１１からの突出寸法が支持台１４ａよりもやや大きい抜止ボス１４ｃが形成される。また、下側の支持台１５ａの周囲に設けたガイド壁１５ｂの前端面には下半分程度の受け片１５ｃが連続一体に形成されている。背板１１から受け片１５ｃまでの寸法は背板１１から支持台１５ａの先端面までの寸法よりもやや大きく設定されている。背板１１における開口窓１３の周縁には全周に亘って前方に突出する補強突条１１ａが形成されており、補強突条１１ａにより開口窓１３の周部が補強されている。つまり、比較的大面積である開口窓１３を形成しながらも、補強突条１８により剛性を保つことができる。さらに背板１１のうち開口窓１３の上下の周縁には左右方向に等ピッチで多数個の通し孔１６が形成される。ところで、開口窓１３における左右方向の中間部には上下の通し孔１６に螺合する固定ねじ１７ａ（図３参照）を用いて中桟１７が取り付けられる。中桟１７には上下２個の載置台１８ａ，１９ａが形成され、下側の載置台１９ａには受け片１５ｃと同様に断面Ｌ字状に形成された受け片１９ｂが設けられる。
【００１３】
一方、蓋体２０は後端部外周面が箱本体１０の側板１２の前端部外周面にほぼ一致し、矩形状に形成された３個の窓孔２１ａ〜２１ｃが開口する。窓孔２１ａは箱本体１０に収納された主幹開閉器３１のハンドル３１ａおよび後述する一次送り開閉器３３のハンドル３３ａを操作可能とするために蓋体２０の前面側に露出させ、窓孔２１ｂ，２１ｃは分岐開閉器３２のハンドル３２ａを操作可能とするために蓋体２０の前面側に露出させる。つまり、主幹開閉器３１と一次送り開閉器３３とのハンドル３１ａ，３３ａを１つの窓孔２１ａから露出させることができる。
【００１４】
ところで、箱本体１０の背板１１に形成した開口窓１３の左側の支持台１４ａ，１５ａと中桟１７に設けた載置台１８ａ，１９ａとの間には主幹開閉器３１を取り付ける第１架台４０が架設され、開口窓１３の右側の支持台１４ａ，１５ａと中桟１７に設けた載置台１８ａ，１９ａとの間には分岐開閉器３２を取り付ける第２架台５０が架設される。第１架台４０と第２架台５０とは互いに連結され一体化される。
【００１５】
第１架台４０と第２架台５０とを連結した状態では全体として矩形状をなし、左右両側縁の上下両端部にそれぞれ支持片４１，５１を突設した形になる。各支持片４１，５１には、支持台１４ａ，１５ａに螺入される取付ねじ２５（図３参照）の頭部の直径よりも大きい丸孔状の大径部の上縁の一部に取付ねじ２５の頭部の直径よりも幅狭の溝部が連続する鍵穴状に形成された取付孔４１ａ，５１ａがそれぞれ形成されている。したがって、各支持台１４ａ，１５ａに取付ねじ２５を緩く螺入した状態で、取付ねじ２５の頭部に取付孔４１ａ，５１ａの大径部を通し、取付ねじ２５の頭部を溝部に対応する部位までスライドさせた後に取付ねじ２５を締め付けることにより箱本体１０に第１架台４０および第２架台５０を容易に取り付けることができる。また、上述したように支持台１４ａ，１５ａの周囲にはガイド壁１４ｂ，１５ｂが形成されているから、第１架台４０および第２架台５０の取付位置をガイド壁１４ｂ，１５ｂに合わせることで容易に位置決めできる。さらに、下側のガイド壁１５ｂおよび中桟１７にはそれぞれ受け片１５ｃ，１９ｂが形成されているから、第１架台４０および第２架台５０の一部を受け片１５ｃ，１９ｂの後面側に重複させれば、取付ねじ２５が万一外れても受け片１５ｃで第１架台４０および第２架台５０の荷重を受けることができる。
【００１６】
取付孔４１ａ，５１ａの溝部に取付ねじ２５を挿入した状態では、取付孔４１ａ，５１ａの大径部に抜止ボス１４ｃが挿入されるように抜止ボス１４ｃの位置が設定されており、取付ねじ２５を締め付けた後には、支持片４１，５１は箱本体１０に対して回り止めされる。また、抜止ボス１４ｃが取付孔４１ａ，５１ａの大径部に挿入されることによって、取付ねじ２５が多少緩んでも支持片４１，５１が箱本体１０に対してがたつくのを防止することができる。例えば、地震などの外部振動によって取付ねじ２５に緩みが生じたとしても、箱本体１０に対して第１架台４０および第２架台５０が移動したり脱落したりするのを防止することができる。
【００１７】
第１架台４０は、箱本体１０に形成した開口窓１３の上下の幅寸法よりも上下の幅寸法が小さい縦長の長方形状に板金（鉄板）により形成されている。図５に示すように、第１架台４０の左側縁には上下一対の支持片４１が突設され、右側縁には上下一対の連結片４２が突設される。連結片４２には支持片４１と同様の鍵穴状の連結孔４２ａが形成され、連結孔４２ａの右側に隣接して止め孔４２ｂが形成されている。主幹開閉器３１は第１架台４０に対して固定ねじ４３を用いて取り付けられる。
【００１８】
本実施形態では、主幹開閉器３１が遮断された状態でも火災報知器などへの電源を確保することができるように、主幹開閉器３１の電源側（一次側）から主幹開閉器３１を通さずに電源を得る電源系を設けてあり、この電源系には箱本体１０に収納される内器としての一次送り開閉器（一次送りブレーカ）３３が挿入される。一次送り開閉器３３は分岐開閉器３２と同構成を有するものであり、第１架台４０の左端部に連結ねじ６３を用いて連結された上下方向に長い矩形状の補助取付板６０に取り付けられる。なお、一次送り開閉器３３は主幹開閉器３１に当接させる形で配設されており、一次送り開閉器３３の位置決めが容易になっている。また、補助取付板６０の長手方向の上半部には、一次送り開閉器３３の電源側端子（図示せず）と主幹開閉器３１の電源側端子３１ｂにおける一方の電圧極と中性極とを接続線７４を介して接続する中継端子台７０が取り付けられている。
【００１９】
分岐開閉器３２を取り付ける第２架台５０は、図６に示す形状に板金（鉄板）により形成されたものであり、右端縁の上端部および下端部に支持片５１が突設され、左端縁の上端部および下端部に連結片５２が突設されている。支持片５１には上述したように鍵穴状の取付孔５１ａが形成されるが、連結片５２には連結突起５２ａが突設され、連結突起５２ａの右側近傍には止めねじ孔５２ｂが形成されている。連結突起５２ａは第１架台４０の連結片４２に設けた連結孔４２ａにおける大径部に挿入され、止めねじ孔５２ｂには止め孔４２ｂを通して連結ねじ５３（図３参照）が螺合する。
【００２０】
したがって、第２架台５０の連結片５２の前面側に第１架台４０の連結片４２を重ね合わせ、連結突起５２ａを連結孔４２ａに挿入するとともに、止め孔４２ｂを通して連結ねじ５３を止めねじ孔５２ｂに螺合させることによって、第１架台４０と第２架台５０とが結合される。この構成によって、連結ねじ５３が多少緩んでも第１架台４０と第２架台５０とが外れるのを防止できる。
【００２１】
ところで、第２架台５０の上下方向の中央部には左右４個の矩形状の貫き孔５４が形成され、第２架台５０の上下両端部には左右方向において貫き孔５４とほぼ同じ位置で保持孔５５が形成されている。貫き孔５４および保持孔５５は第２架台５０の前面側に載置される合成樹脂成形品からなるバー支持部材８０を取り付けるために用いられる。保持孔５５は上下方向の寸法が左右方向の寸法よりも大きい長孔状に形成され、下端部における左右のいずれか一方の側縁から抜止片５５ａが突設された形状に形成されている。
【００２２】
バー支持部材８０は、図７に示すように、上下方向の中央部に隔壁８１を有する。隔壁８１は前方に突出し左右方向に延長されており、隔壁８１における左右方向の両端部には前方に突出する支持ポスト８２が形成される。支持ポスト８２の前面（図７の上面）には凹所８２ａが形成され、凹所８２ａの底部には図示しないナットが保持されている。また、支持ポスト８２の前面には凹所８２ａの近傍に位置決め突起８２ｂが突設される。バー支持部材８０の隔壁８１には分離壁８１ａが一体に形成され、分離壁８１ａにより隔壁８１が８区画に分割されている。
【００２３】
バー支持部材８０には上下に載置片８４が延設されており、各載置片８４の左右両端部には後方に凹没した凹所８４ａが２個ずつ形成され、各凹所８４ａの底部には図示しないナットが保持されている。各載置片８４の上下の中間部には隔壁８１側が後退する段差部８５が形成され、段差部８５と隔壁８１との間には左右方向に並ぶ８本の係止部８６が前方に立設される。係止部８６は左右方向においては分離壁８１ａにより分割された各区間の中間部に位置し、各係止部８６の前端部には隔壁８１に向かって突出する保持爪８６ａ（図９参照）が形成される。さらに、１つおきで４個の分離壁８１ａには引掛爪８１ｂが突設される。引掛爪８１ｂは分離壁８１ａにおいて隔壁８１よりも上側では上向きに突設され、隔壁８１よりも下側では下向きに突設される。さらに、段差部８５において隔壁８１に対向する面には保持爪８５ａが突設される。隔壁８１の上側の載置片８４の上端縁および隔壁８１の下側の載置片８４の下端縁にはそれぞれ８個ずつの遮断器取付片８７が並設されている。遮断器取付片８７の機能については後述する。
【００２４】
ところで、バー支持部材８０における上述の引掛爪８１ｂは、載置片８４に挿通されるスライドコアを用いてアンダカット部を形成する方法で形成してある。したがって、載置片８４にはスライドコアを通過するための透孔８１ｃが形成される。また、載置片８４の後面には図８に示すように各透孔８１ｃの周囲においてボス部８１ｄが後方に突設される。載置片８４の後面には左右方向の断面がＬ字状に形成された上下各４個ずつのスライド片８８が突設される。スライド片８８の上下方向の寸法は、第２架台５０に設けた保持孔５５において抜止片５５ａよりも上側の部分に挿入可能となるように設定される。載置片８４には各スライド片８８の先端部をそれぞれ前方から視認可能とする複数個の確認孔８４ｂが開口する。
【００２５】
しかして、バー支持部材８０を第２架台５０に取り付けるに際しては、スライド片８８を保持孔５５の上部に挿入した後に、図１０に示すように、バー支持部材８０を第２架台５０に対して下方にスライドさせると、スライド片８８が抜止片５５ａに係合し、バー支持部材８０が第２架台５０に結合される。また、バー支持部材８０が第２架台５０に結合された状態においてボス部８１ｄは貫き孔５４に挿入され、バー支持部材８０の第２架台５０に対する取付強度が高まるとともに、透孔８１ｃを通る沿面距離をボス部８１ｄを設けない場合に比べて大きくとることができる。すなわち、後述するように、載置片８４には導電バー９０ｂ，９０ｃが載置されるから、ボス部８１ｄを設けていることによって、導電バー９０ｂ，９０ｃと第２架台５０との沿面距離を大きくとることができる。
【００２６】
バー支持部材８０は中性極の導電バー９０ａと２本の電圧極の導電バー９０ｂ，９０ｃとの３本の導電バー９０ａ〜９０ｃを同時に保持でき、電圧極の導電バー９０ｂ，９０ｃについては幅の異なる２種類の導電バー９０ｂ，９０ｃを選択的に使用することが可能となるように構成されている。つまり、電流容量に応じて幅の異なる導電バー９０ｂ，９０ｃを選択するから、電流容量に応じて厚みの異なる導電バー９０ｂ，９０ｃを選択する場合に比較すると、電流容量が大きい場合に用いる導電バー９０ｂ，９０ｃの表面積をより大きくすることができ、放熱効果を向上させることができる。ただし、図示例では狭幅の導電バー９０ｂ，９０ｃを用いる例を示してある。
【００２７】
中性極の導電バー９０ａは２つの支持ポスト８２の間に架設される。導電バー９０ａには長手方向において等ピッチで挿通孔９１が形成されている。導電バー９０ａの両端部には端子片９２が延設され、端子片９２には端子ねじ９３（図３参照）が挿入される端子孔９４が形成されている。端子ねじ９３は凹所８２ａの底部に設けたナットに螺合し、これによって導電バー９０ａが支持ポスト８２に固定される。
【００２８】
一方、電圧極の各導電バー９０ｂ，９０ｃは隔壁８１の上下においてそれぞれ載置片８４の前面に重ねて配置される。導電バー９０ｂ，９０ｃの長手方向の両端部にはそれぞれ端子孔９５が形成される。端子孔９５には端子ねじ９６（図３参照）が挿入され、端子ねじ９６は載置片８４に設けた凹所８４ａの底部に保持されているナットに螺合する。さらに、導電バー９０ｂ，９０ｃの短手方向の一側縁には前方に向かって接続片９７が突設される。接続片９７には２本の挿入端子片９７ａ，９７ｂが延設され、一方の挿入端子片９７ａは接続片９７から導電バー９０ｂ，９０ｃに対向するように接続片９７に対して直交方向に延長され、他方の挿入端子片９７ｂは導電バー９０ｂ，９０ｃから離れるように接続片９７に対して直交方向に延長される。また、導電バー９０ｂ，９０ｃから挿入端子片９７ｂまでの距離は挿入端子片９７ａまでの距離よりも大きくなっている。したがって、挿入端子片９７ａ，９７ｂは前後に位置することになる。さらに、導電バー９０ｂ，９０ｃを載置片８４に取り付けた状態では、互いに他方の導電バー９０ｂ，９０ｃに設けた挿入端子片９７ｂ，９７ａが前後に位置し、かつ両挿入端子片９７ａ，９７ｂの先端縁の位置が上下左右において揃うように位置する。このような配置によって、前後に並ぶ２つの挿入端子片９７ｂ，９７ａは互いに他の導電バー９０ｂ，９０ｃに接続されていることになる。ここで、支持ポスト８２に取り付けられた中性極の導電バー９０ａの短手方向の端縁も上下方向における位置が両挿入端子片９７ａ，９７ｂの先端縁と一致する。なお、異なる導電バー９０ｂ，９０ｃに設けた接続片９７は隔壁８１によって絶縁される。
【００２９】
ところで、導電バー９０ｂ，９０ｃの長手方向の両端部には支持ポスト８２の角部に合致する形状の切欠部９８が形成されている。したがって、切欠部９８と支持ポスト８２とが係合することによって、導電バー９０ｂ，９０ｃはバー支持部材８０に対して左右方向に位置決めされることになる。また、導電バー９０ｂ，９０ｃの短手方向の一端部は分離壁８１ａに設けた引掛爪８１ｂと載置片８４との間で保持され、他端部は係止部８６に設けた保持爪８６ａと載置片８４との間で保持される。
【００３０】
したがって、導電バー９０ｂ，９０ｃをバー支持部材８０に装着するには、引掛爪８１ｂと載置片８４との間に導電バー９０ｂ，９０ｃの一端部を挿入し、導電バー９０ｂ，９０ｃを載置片８４に押しつければ係止部８６の保持爪８６ａと載置片８４との間で導電バー９０ｂ，９０ｃの他端部が保持される。なお、広幅の導電バー９０ｂ，９０ｃを用いる場合には、係止部８６が挿入される係止孔を導電バー９０ｂ，９０ｃに形成しておき、導電バー９０ｂ，９０ｃの短手方向の一端部を分離壁８１ａに設けた引掛爪８１ｂと載置片８４との間で保持するとともに、他端部を段差部８５に設けた保持爪８５ａと載置片８４との間で保持することになる。
【００３１】
上述のようにしてバー支持部材８０に取り付けられた導電バー９０ａ〜９０ｃは主幹開閉器３１の負荷側端子３１ｃと電気的に接続される。主幹開閉器３１の負荷側端子３１ｃと導電バー９０ａ，９０ｂ，９０ｃとは端子ねじ９３，９６，９６を用いて外れないように接続される。
【００３２】
導電バー９０ａ〜９０ｃは分岐開閉器３２を接続するために設けられており、上述のように上下２段に８個ずつの分岐開閉器３２を配列している。分岐開閉器３２は一次送り開閉器３３と同形状であって、電源側には図４および図９に示すようなスリット状の３つの端子部３７ａ〜３７ｃが設けられる。端子部３７ａ〜３７ｃのうち端子部３７ａには中性極の導電バー９０ａが挿入され、端子部３７ｂ，３７ｃには電圧極の導電バー９０ｂ，９０ｃの挿入端子片９７ｂ，９７ａが挿入される。つまり、分岐開閉器３２にはいわゆるプラグイン式のものを用いる。ただし、各分岐開閉器３２はそれぞれ各導電バー９０ａ〜９０ｃのうちの２本にのみ電気的に接続され、他の１本はダミーとして扱われる。例えば、図９に示す例では、端子部３７ａ，３７ｃにのみ受け刃３５ａ，３５ｃが設けられており、端子部３７ａに導電バー９０ａが接続され、端子部３７ｃに挿入端子片９７ａが接続されるが、挿入端子片９７ｂは端子部３７ｂに挿入されるだけで電気的な接続は行われていない。
【００３３】
上述したように、バー支持部材８０には遮断器取付片８７が設けられており、また、バー支持部材８０の前面には各遮断器保持片８７にそれぞれ対応する部位で遮断器支持片８９が突設される。分岐開閉器３２の一方の側面には遮断器保持片８７に係合する保持溝３８が開口する。さらに、分岐開閉器３２の前面であって隔壁８１寄りの端部には２個の結束用突部３９が突設されている。
【００３４】
しかして、分岐開閉器３２をバー支持部材８０に取り付けるに際しては、端子部３７ａに導電バー９０ａを挿入し、端子部３７ｂ，３７ｃには挿入端子片９７ｂ，９７ａを挿入せずに分岐開閉器３２を挿入端子片９７ｂ，９７ａの幅方向にずらしている状態から、分岐開閉器３２の保持溝３８に遮断器保持片８７を挿入するとともに挿入端子片９７ｂ，９７ａを端子部３７ｂ，３７ｃに挿入するように分岐開閉器３２をスライドさせる。このとき、遮断器支持片８９が分岐開閉器３２の側面に当接して分岐開閉器３２の位置ずれが防止される。
【００３５】
上述のようにして、分岐開閉器３２がバー支持部材８０に固定された状態では、上下の分岐開閉器３２の間に分離壁８１ａの上下幅程度の隙間が形成される。この隙間を覆う形で分岐開閉器３２の前面には結束部材１００が取り付けられる。結束部材１００は８個の分岐開閉器３２の幅寸法に相当する長さを有し、上下の分岐開閉器３２の間に形成される隙間に挿入される挿入脚１０１を備える。また、結束部材１００は導電バー９０ａの挿通孔９１に圧入される圧入突起１０２を備え、圧入突起１０２が挿通孔９１に圧入されることによって結束部材１００が導電バー９０ａに固定される。結束部材１００には上下の各分岐開閉器３２の前面に重なる部位まで延長された結束片１０３が形成され、結束片１０３の先端部に設けた切欠溝１０４が分岐開閉器３２の前面に突設された結束用突部３９に係合することによって、上下の分岐開閉器３２が結束部材１００に連結されるようにしてある。この結束部材１００を設けていることにより、各分岐開閉器３２が結束部材１００を介して連結されることになる。要旨ではないから詳述しないが、結束部材１００の結束片１０３は各分岐開閉器３２ごとに切欠溝１０４と結束用突部３９との係合状態を解除できるように構成されている。
【００３６】
上述したように、第１架台４０には主幹開閉器３１および一次送り開閉器３３が取り付けられ、第２架台５０には分岐開閉器３２が取り付けられており、本実施の形態では、第１架台４０と第２架台５０とで、複数のブレーカ（主幹開閉器３１、分岐開閉器３２、一次送り開閉器３３）が前面側に配置され箱本体１０の内部に収納される基板を構成している。分岐開閉器３２と一次送り開閉器３３とは同じ構成であってハンドル３２ａ，３３ａの開閉操作の際の移動範囲が等しいものを用いる。主幹開閉器３１と分岐開閉器３２と一次送り開閉器３３とは、いずれもハンドル３１ａ〜３３ａが前面側になるように配置され、かつハンドル３１ａ〜３３ａの開閉操作時の移動方向が上下方向となるように配置される。また、上下各段の分岐開閉器３２ではハンドルの開操作位置と閉操作位置との上下の位置関係が逆になるように配置してある。これは、上下の分岐開閉器３２に同構成のものを用い、上下の分岐開閉器３２の間に上述した位置関係で導電バー９０ａ〜９０ｃを配置することによって実現される。言い換えると、分岐開閉器３２を上下２段に配置しながらも、上下各段の分岐開閉器３２の間に導電バー９０ａ〜９０ｃを配置することになり、主幹開閉器３１と分岐開閉器３２とを接続する電路を箱本体１０の中において省スペースで配設することができる。なお、主幹開閉器３１の電源側端子３１ｂに接続される電線や分岐開閉器３２の負荷側端子に接続される電線は箱本体１０の背板１１に開口した配線用の開口窓１３を通して箱本体１０内に導入される。
【００３７】
ところで、上述の第２架台５０の上下両縁には前方に立設された立設壁５６（図９参照）が形成され、バー支持部材８０の上下両縁にはそれぞれ後方に立設された立設壁８３（図７ないし図９参照）が形成されている。各立設壁５６，８３の前後方向の寸法はバー支持部材８０の載置片８４に設けた段差部８５の段差にほぼ等しく設定されている。ここにおいて、互いに対向する立設壁５６，８３の間にはアルミニウムよりなる角柱状の棒体１２０がそれぞれ配設されている。
【００３８】
各棒体１２０は、分岐開閉器３２と第２架台５０との間に介在し、棒体１２０の前面が分岐開閉器３２の後面に当接し、棒体１２０の後面が第２架台５０に当接している。なお、各棒体１２０は、上下各段の分岐開閉器３２それぞれにおいて負荷側端子が設けられている側の端部（端子部３７ａ〜３７ｃが形成されている側の端部と反対側の端部）の後面に当接している。したがって、分岐開閉器３２の負荷側端子で発生した熱を熱伝導率が鉄板に比べて高いアルミニウムよりなる棒体１２０を介して第２架台５０に伝えることができる。ここに、分岐開閉器３２は、従来の分岐開閉器３２’と同様、外部から器体内に挿入された電線導体が接続される端子板と、端子板との間に電線導体を挟持する鎖錠ばねとからなるいわゆる速結端子が負荷側端子として設けられており、電源側端子と負荷側端子との間の電路に介挿され器体内に収納された接点と、接点の閉極状態において上記電路への通電量に応じて変形して過電流が流れると接点が強制開極するように変形するバイメタルが器体内に収納されている。
【００３９】
上述の各棒体１２０は、導電バー９０ａ〜９０ｃの延長方向、つまり左右方向が長手方向となるように第２架台５０の上下両端部それぞれの前面側に配置されている。ここに、第２架台５０の支持片５１には、上述したように取付孔５１ａが形成されているが、取付孔５１ａの左側近傍には、棒体１２０の右方向への移動を規制するための位置決めねじ５８が取着されている。これに対して、棒体１２０は右端面（長手方向の一端面）の一部が位置決めねじ５８に当接し、左端面（長手方向の他端面）の一部が第１架台４０から突設された連結片４２の右端縁に当接するように長手方向の寸法が設定されている。したがって、棒体１２０は左右方向への移動が連結片４２および位置決めねじ５８により規制され、前後方向への移動が分岐開閉器３２と第２架台５０とにより規制され、上下方向への移動が立設壁５６，８３で規制されることになる。
【００４０】
ところで、第２架台５０の背面側には、開口窓１３における左右方向の中間部で第２架台５０の背面に当接する形で箱本体１１の背板１１に取着される放熱ブロック１１０が配設されている。放熱ブロック１１０は、図１１および図１２に示すような形状の放熱部材１１１を厚み方向に複数枚重ねて連結ピン１１２で連結することにより形成されている。放熱部材１１１は、第２架台５０の背面に短手方向の一側縁が当接する細長い平板状の放熱板１１１ａと、放熱板１１１ａの短手方向の他側縁から突出し放熱板１１１ａの長手方向に等ピッチで配列された多数のフィン１１１ｂとを備えている。ここにおいて、各放熱部材１１１は、放熱板１１の長手方向におけるフィン１１１ｂの幅と隣り合うフィン１１１ｂ間の距離とを同じ値に設定し、さらに、放熱板１１１ａの長手方向の一端からフィン１１１ｂまでの距離と放熱板１１１ａの長手方向の他端からフィン１１１ｂまでの距離とを上記ピッチの半分だけ異ならせてある。また、放熱板１１１ａは、長手方向に沿って並ぶ複数の突起１１４が厚み方向の一面側および他面側に交互に打ち出された形で形成されている。つまり、突起１１４は、放熱板１１１ａの一部を厚み方向に打ち出して形成されており、放熱板１１１ａは、突起１１４が突設された面と反対側の面において突起１１４に重なる部位に突起１１４の打ち出し時に形成された穴１１５が設けられている。
【００４１】
これに対して、放熱ブロック１１０は、複数枚（図示例では５枚）の放熱部材１１１を放熱板１１１ａの厚み方向に重ねて複数個並設するにあたって、放熱板１１１ａの厚み方向において隣り合う放熱部材１１１同士で放熱板１１１ａの長手方向の両端部が逆になるようにして並設してある。したがって、隣り合う放熱部材１１１で長手方向の両端面の位置を揃えているにもかかわらず、隣り合う放熱部材１１１について見ればフィン１１１ｂが放熱板１１１ａの厚み方向において重ならないので、隣り合う放熱部材１１１でフィン１１１ｂが放熱板１１１ａの厚み方向において重なる場合に比べて放熱面積を大きくすることができ、放熱効果を向上させることができる。また、上述のように各放熱板１１１ａの厚み方向の両面にはそれぞれ複数の突起１１４が突設されているので、厚み方向において隣り合う放熱板１１１ａ間に突起１１４が介在して放熱板１１１ａ間に隙間が形成されるから、放熱面積をさらに大きくすることができ、放熱効果をさらに向上させることができる。
【００４２】
上述の放熱部材１１１を製造する際、２つの放熱部材１１１の長手方向の両端部が逆になり且つ一方の放熱部材１１１の隣り合うフィン１１１ｂ間の隙間に他方の放熱部材１１１のフィン１１１ｂが挟まる形で打ち抜き形成することによって、切屑が少なくなって、放熱部材１１１を形成するための材料を無駄なく有効に利用できる。しかも、平板状の材料を打ち抜いて放熱板１１１ａとフィン１１１ｂとを備えた放熱部材１１１を形成した後に突起１１４を打ち出して形成することができるので、放熱部材１１１の製造作業が容易になる。
【００４３】
ところで、各放熱部材１１１の放熱板１１１ａには、厚み方向に貫設され上述した連結ピン１１２が挿通される複数の連結孔１１３が長手方向に沿って設けられており、放熱ブロック１１０は、複数個の放熱部材１１１の放熱板１１１ａを上述のように重ね合わせた状態で連結ピン１１２を挿入し連結ピンの先端部をかしめることによって複数の放熱部材１１１を連結している。
【００４４】
上述のようにして構成された放熱ブロック１１０は、各放熱板１１１ａの一側縁が前面側となり各放熱板１１１ａの上記一端縁が第２架台５０の背面に当接する形で、つまり、フィン１１１ｂが後方に向かって突出する形で、金属製の２つの取付部材１１７を用いて箱本体１０の背板１１に取着される。取付部材１１７は、上述の補強突条１８との間に放熱ブロック１１０の長手方向の端部を挟持する押さえ片１１７ａを備え、放熱ブロック１１０の左側面に当接する保持片１１７ｂが押さえ片１１７ａの一側縁（図１における左側縁）から後方に向かって突設され、押さえ片１１７ａの他側縁（図１における右側縁）から段差部１１７ｃを介して取付片１１７ｄを設けた形状に形成されている。ここに、取付部材１１７の取付片１１７ｄには、背板１１の開口窓１３の上下の周縁に形成された上述の通し孔１６に螺合する取付ねじ１１８（図３参照）が挿通される挿通孔（図示せず）が形成されている。なお、本実施の形態では、複数枚の放熱部材１１１を連結ピン１１２を用いて連結することで放熱ブロック１１０を構成しているが、放熱部材１１１を１枚だけ用いてもよい。また、通し孔１６が、放熱部材１１１（本実施の形態では、放熱ブロック１１０）を取り付けるための取付部を構成している。また、上述のように第１架台４０と第２架台５０とで基板を構成している。
【００４５】
しかして、本実施形態では、基板の背面に当接する形で配設され分岐開閉器３２から基板に伝わる熱を放熱する放熱部材１１１（放熱ブロック１１０）を備えているので、分岐開閉器３２から発生する熱が基板に伝わり、基板の熱を放熱部材１１１で素早く放熱させることができるから、分岐開閉器３２近傍の熱を逃がしやすく、分岐開閉器３２の引き外し特性が安定する。また、上述のように分岐開閉器３２と第２架台５０との間にアルミニウムにより形成された棒体１２０を介在させてあるので、分岐開閉器３２と第２架台５０との間での放熱面積を大きくすることができ、分岐開閉器３２で発生した熱を第２架台５０へより素早く伝えることができるので、放熱部材１１１のフィン１１１ｂで放熱させやすくなる。
【００４６】
しかも、箱本体１０の背板１１には、放熱部材１１１（放熱ブロック１１０）を取り付けるための複数の取付部が導電バー９０ａ〜９０ｃの延長方向（図３の左右方向）に並設されているので、放熱部材１１１（放熱ブロック１１０）を取着する位置を導電バー９０ａ〜９０ｃの延長方向で可変することができ、分岐開閉器３２の数に応じて放熱部材１１１（放熱ブロック１１０）を取着する位置を適宜変更することができ、分岐開閉器３２の数が多い場合には、複数の位置にそれぞれ放熱部材１１１（放熱ブロック１１０）を取着することにより、分岐開閉器３２の数が多いにも関わらず各分岐開閉器３２近傍の熱を素早く逃がすことが可能になる。ここに、放熱部材１１１は、アルミニウムにより形成されているので、放熱部材１１１として例えば鉄板を用いる場合に比べて熱伝導率が高く熱を吸収しやすくなり、分岐開閉器３２で発生した熱を基板を介して素早く吸収することが可能となり、分岐開閉器３２で発生する熱が引き外し特性へ与える影響をさらに少なくすることができる。また、放熱部材１１１として例えば鉄板を用いる場合に比べて軽量化が図れ、放熱部材１１１を設けたことによる分電盤の重量の増加を少なくできるから、放熱部材１１１の重みで箱本体１０が破損する恐れを少なくすることができる。
【００４７】
【発明の効果】
請求項１の発明は、背板の周縁の全周が側板に囲まれた前面開口する箱本体と、箱本体の前面に取着される蓋体と、複数のブレーカが前面側に配置され箱本体の内部に収納される基板と、基板の背面に当接する形で配設されブレーカから基板に伝わる熱を放熱する放熱部材とを備え、前記複数のブレーカとして主幹ブレーカと主幹ブレーカの負荷側端子に接続された導電バーの延長方向に並設され電源側端子が導電バーを介して主幹ブレーカに電気的に接続された分岐ブレーカとを備え、前記放熱部材が導電バーの延長方向に直交する方向の両側で前記背板に取着されるものであって、前記背板には、前記放熱部材を取り付けるための複数の取付部が設けられ、取付部は、放熱部材を取着する位置を導電バーの延長方向で可変できるように導電バーの延長方向に並設されてなるものであり、ブレーカから発生する熱が基板に伝わり、基板の熱を放熱部材で素早く放熱させることができるから、ブレーカ近傍の熱を逃がしやすく、ブレーカの引き外し特性が安定するという効果がある。また、前記放熱部材を取着する位置を導電バーの延長方向で可変することができるから、ブレーカの数に応じて放熱部材を取着する位置を適宜変更することができ、しかも、ブレーカの数が多い場合には、複数の位置にそれぞれ放熱部材を取着することにより、ブレーカの数が多いにも関わらずブレーカ近傍の熱を素早く逃がすことが可能になるという効果がある。
【図面の簡単な説明】
【図１】実施形態における分電盤を示す分解斜視図である。
【図２】同上の正面図である。
【図３】同上の蓋体を外した状態の正面図である。
【図４】同上の縦断面図である。
【図５】同上の要部正面図である。
【図６】同上の要部分解斜視図である。
【図７】同上の要部分解斜視図である。
【図８】同上に用いるバー支持部材を示す斜視図である。
【図９】同上の要部縦断面図である。
【図１０】同上の要部を一部破断した正面図である。
【図１１】同上の要部を一部破断した分解斜視図である。
【図１２】同上の要部を一部破断した断面図である。
【図１３】従来例を示し蓋体を外した状態の正面図である。
【図１４】同上の正面図である。
【図１５】同上の要部断面図である。
【図１６】同上の要部分解斜視図である。
【図１７】同上の要部分解斜視図である。
【符号の説明】
１箱体
１０箱本体
１１背板
１２側板
１３開口窓
１６通し孔
１８補強突条
２０蓋体
３１主幹開閉器
３１ａハンドル
３１ｂ電源側端子
３１ｃ負荷側端子
３２分岐開閉器
３２ａハンドル
３３一次送り開閉器
３３ａハンドル
４０第１架台
５０第２架台
９０ａ〜９０ｃ導電バー
１１０放熱ブロック
１１１放熱部材
１１１ａ放熱板
１１１ｂフィン
１１２連結ピン
１１４突起[0001]
BACKGROUND OF THE INVENTION
  The present invention provides a power distribution device in which a plurality of breakers are housed in a box body.BoardIt is about.
[0002]
[Prior art]
  A conventional distribution board is disclosed in Japanese Patent Application Laid-Open No. 2001-69620. As shown in FIGS. 13 to 17, the distribution board described in this publication includes a box body 10 ′ whose front surface (front side in FIG. 13) is open, and a lid attached to the front surface of the box body 10 ′. A box body 1 ′ composed of a body 20 ′ houses one main switch (main branch breaker) 31 ′ and a plurality of branch switches (branch breakers) 32 ′ as breakers, and branches from the main switch 31 ′. The switch 32 'is electrically connected via the conductive bars 90a', 90b ', 90c'. The main switch 31 ′ and the branch switch 32 ′ have handles 31 a ′ and 32 a ′ for opening and closing operations, respectively, and are accommodated in the box body 10 ′ so that the handles 31 a ′ and 32 a ′ are on the front side. . The branch switches 32 ′ are arranged in two upper and lower stages, and conductive bars 90 a ′ to 90 c ′ extending in the left-right direction so as to be sandwiched between the upper and lower branch switches 32 ′ are housed in the box body 10 ′. The lid 20 'is operable to operate the handle 31a' of the trunk switch 31 ', the window hole 21a' exposed from the front side, and the handle 32a 'of the upper branch switch 32'. A window hole 21b ′ exposed to the front side and a window hole 21c ′ exposed to the front side so that the handle 32a ′ of the lower branching switch 32 ′ can be operated are opened.
[0003]
  The box body 10 ′ is formed in a shape in which a side plate 12 ′ is projected forward over the entire outer periphery of the back plate 11 ′ formed in a rectangular shape, and the rectangular shape is opened in the back plate 11 ′. An opening window 13 'is formed.
[0004]
  By the way, the distribution board described above is composed of a first gantry 40 ′ in which the main switch 31 ′ is attached to the front side and a second gantry 50 ′ in which the branch switch 32 ′ is attached to the front side. The substrate is attached to the back plate 11 ′ of the box body 10 ′. As shown in FIG. 17, the second pedestal 50 ′ includes a pair of frames 130 and 130, and a mounting plate 140 that is installed between the frames 130 and 130 and is fixed by a fixing screw 141. Both the frames 130 and 130 and the mounting plate 140 are formed of sheet metal (iron plate). Further, a synthetic resin molded bar support member 80 ′ for supporting the conductive bars 90a ′ to 90c ′ is attached to the front surface side of the mounting plate 140, and further, a synthetic resin molding for mounting the branch switch 32 ′. A mounting base 150 (see FIG. 15) made of a product is attached so as to straddle the bar support member 80 ′ and the mounting plate 140.
[0005]
  The conductive bars 90a 'to 90c' are provided to connect the branch switches 32 ', and six branch switches 32' are arranged in two upper and lower stages. As shown in FIGS. 15 and 16, three slit-like terminal portions 37 a ′, 37 b ′, and 37 c ′ are provided on the power source side of the branch switch 32 ′, and among the terminal portions 37 a ′ to 37 c ′, A neutral electrode conductive bar 90a is inserted in the terminal portion 37a ', and an insertion terminal piece 97b' extended from the connection piece 97 'of the voltage electrode conductive bars 90b' and 90c 'in the terminal portions 37b' and 37c '. , 97a ′ are inserted. That is, a so-called plug-in type is used for the branch switch 32 '. Accordingly, the operation of connecting the branch switch 32 'to the conductive bars 90a' to 90c 'is facilitated. However, each branch switch 32 'is electrically connected to only two of the conductive bars 90a' to 90c ', and the other one is treated as a dummy. For example, in the example shown in FIG. 15, receiving blades 35a ′ and 35c ′ are provided only in the terminal portions 37a ′ and 37c ′, and a conductive bar 90a ′ is connected to the terminal portion 37a ′ and inserted into the terminal portion 37c ′. The terminal piece 97a ′ is connected, but the insertion terminal piece 97b ′ is merely inserted into the terminal portion 37b ′ and is not electrically connected. That is, in each branch switch 32 ′, the terminal portions 37 a ′ and 37 c ′ are power supply side terminals.
[0006]
  Note that the load side of the branch switch 32 ′ is a so-called speed composed of a terminal plate to which a wire conductor inserted from the outside into the body is connected, and a locking spring for sandwiching the wire conductor between the terminal plates. A connection terminal is provided as a load side terminal. Further, the branch switch 32 'is deformed according to the amount of power supplied to the electric circuit when the contact is inserted in the electric circuit between the power supply side terminal and the load side terminal and accommodated in the device body and the contact is closed. A bimetal that is deformed so that the contact is forcibly opened when an overcurrent flows is stored in the container.
[0007]
[Problems to be solved by the invention]
  By the way, in the distribution board, generally, at the connection part between the branch switch and the conductive bar, the connection part between the load side terminal (output terminal) of the branch switch and the electric wire conductor (output line), etc. Although heat is generated, there is a problem that it is difficult to quickly release the heat generated in the vicinity of the branch switch. Here, the branch switch has a problem that the tripping characteristics vary due to the heat inside the box because the contact is forcibly opened by the bimetal at the time of overcurrent.
[0008]
  In particular, in the distribution board having the conventional configuration described above, the branch switch 32 'and two of the conductive bars 90a' to 90c 'are connected by a plug-in type (plug-in type). Among the terminal portions 37a ′ to 37c ′, the neutral electrode conductive bar 90a is inserted into the terminal portion 37a ′, and the connecting pieces 97 of the voltage electrode conductive bars 90b ′ and 90c ′ are inserted into the terminal portions 37b ′ and 37c ′. Since the insertion terminal pieces 97b 'and 97a' extended from 'are inserted, the interval between the conductive bars 90b' and 90c 'and the branch switch 32' becomes narrow, and the conductive bars 90a to 90c ' There was a problem that heat accumulated between the branch switch 32 'and variation in tripping characteristics of the branch switch 32' was large. Further, since the branch switches 32 'are provided in two upper and lower stages, the distance between the upper and lower branch switches 32' is short, and heat is likely to be accumulated in the space between the upper and lower branch switches 32 '. There was a bug.
[0009]
  The present invention has been made in view of the above reasons, and its purpose is to easily distribute heat near the breaker and to stabilize the tripping characteristics of the breaker.BoardIs to provide.
[0010]
[Means for Solving the Problems]
  The invention of claim 1In order to achieve the above object, a box body having a front opening in which the entire periphery of the back plate is surrounded by side plates, a lid attached to the front surface of the box body, and a plurality of breakers are arranged on the front side. A substrate housed inside the box body, and a heat dissipating member disposed in contact with the back surface of the substrate to dissipate heat transmitted from the breaker to the substrate, and the main breaker and the load side of the main breaker as the plurality of breakers A branch breaker that is arranged in parallel in the extending direction of the conductive bar connected to the terminal and the power supply side terminal is electrically connected to the main breaker via the conductive bar, and the heat dissipation member is orthogonal to the extending direction of the conductive bar Attached to the back plate on both sides in the direction, The plate is provided with a plurality of attachment portions for attaching the heat radiating member, and the attachment portions are arranged in parallel in the extending direction of the conductive bar so that the position where the heat radiating member is attached can be changed in the extending direction of the conductive bar. BecomeThe heat generated from the breaker is transferred to the board, and the heat from the board can be quickly dissipated by the heat dissipating member, so that the heat in the vicinity of the breaker is easily released and the tripping characteristics of the breaker are stable.. Further, since the position where the heat radiating member is attached can be changed in the extending direction of the conductive bar, the position where the heat radiating member is attached can be appropriately changed according to the number of breakers, and the number of breakers can be changed. If there are many, installing heat dissipation members at multiple positions makes it possible to quickly release the heat near the breakers despite the large number of breakers..
[0011]
DETAILED DESCRIPTION OF THE INVENTION
  This embodimentstateAs shown in FIG. 1 to FIG. 4, a residential distribution board in which a main trunk switch (main trunk breaker) 31 and a plurality of branch switches (branch breakers) 32 are arranged in the box 1 as an inner unit. The branch switch 32 is arranged in two upper and lower stages. The box body 1 is a synthetic resin molded product and includes a rectangular frame-shaped box body 10 and a lid body 20 coupled to the front side of the box body 10 (the right side in FIG. 1).
[0012]
  The box body 10 is formed in a shape in which a side plate 12 protrudes forward all around the outer peripheral edge of a back plate 11 formed in a rectangular frame shape, and the back plate 11 has a rectangular shape for wiring. An opening window 13 is formed. Two upper and lower support bases 14a and 15a project from the left and right ends of the back plate 11, respectively, and each support base 14a and 15a has an L-shaped cross section and forms a corner of a rectangular region. Guide walls 14b and 15b are formed. The upper support 14a is formed with a retaining boss 14c adjacent to the lower side and having a protruding dimension from the back plate 11 slightly larger than that of the support 14a. Further, a receiving piece 15c of about the lower half is formed continuously and integrally on the front end surface of the guide wall 15b provided around the lower support base 15a. The dimension from the back plate 11 to the receiving piece 15c is set to be slightly larger than the dimension from the back plate 11 to the front end surface of the support base 15a. Reinforcing ridges 11a that protrude forward are formed over the entire periphery of the periphery of the opening window 13 in the back plate 11, and the peripheral portion of the opening window 13 is reinforced by the reinforcing ridges 11a. That is, the rigidity can be maintained by the reinforcing protrusion 18 while the opening window 13 having a relatively large area is formed. Further, a large number of through holes 16 are formed at equal pitches in the left-right direction on the upper and lower peripheral edges of the opening window 13 in the back plate 11. By the way, the middle rail 17 is attached to the middle part of the left-right direction in the opening window 13 using the fixing screw 17a (refer FIG. 3) screwed in the upper and lower through-holes 16. FIG. The middle rail 17 is formed with two upper and lower mounting tables 18a and 19a, and the lower mounting table 19a is provided with a receiving piece 19b having an L-shaped cross section similar to the receiving piece 15c.
[0013]
  On the other hand, the outer peripheral surface of the rear end portion of the lid 20 substantially coincides with the outer peripheral surface of the front end portion of the side plate 12 of the box body 10, and three window holes 21a to 21c formed in a rectangular shape are opened. The window hole 21a is exposed to the front side of the lid 20 so that the handle 31a of the main switch 31 accommodated in the box body 10 and the handle 33a of the primary feed switch 33 to be described later can be operated. 21c is exposed to the front side of the lid 20 so that the handle 32a of the branch switch 32 can be operated. That is, the handles 31a and 33a of the main switch 31 and the primary feed switch 33 can be exposed from one window hole 21a.
[0014]
  By the way, the 1st mount 40 which attaches the main switch 31 between the support bases 14a and 15a of the left side of the opening window 13 formed in the backplate 11 of the box main body 10, and the mounting bases 18a and 19a provided in the middle rail 17 is provided. A second frame 50 for mounting the branch switch 32 is installed between the right support bases 14a and 15a of the opening window 13 and the mounting bases 18a and 19a provided on the middle rail 17. The first mount 40 and the second mount 50 are connected and integrated with each other.
[0015]
  In a state where the first mount 40 and the second mount 50 are connected, the overall shape is rectangular, and support pieces 41 and 51 protrude from the upper and lower ends of the left and right side edges, respectively. Each support piece 41, 51 is attached to a part of the upper edge of a round hole-shaped large-diameter portion larger than the diameter of the head of the attachment screw 25 (see FIG. 3) screwed into the support bases 14a, 15a. Mounting holes 41a and 51a each having a keyhole shape in which a groove narrower than the diameter of the head of the screw 25 is formed are formed. Therefore, with the mounting screws 25 loosely screwed into the support bases 14a and 15a, the large diameter portions of the mounting holes 41a and 51a are passed through the heads of the mounting screws 25, and the heads of the mounting screws 25 correspond to the groove portions. The first mount 40 and the second mount 50 can be easily attached to the box body 10 by tightening the mounting screw 25 after sliding to the site. Further, as described above, since the guide walls 14b and 15b are formed around the support bases 14a and 15a, it is easy to match the mounting positions of the first base 40 and the second base 50 with the guide walls 14b and 15b. Can be positioned. Further, since receiving pieces 15c and 19b are formed on the lower guide wall 15b and the intermediate rail 17, respectively, a part of the first frame 40 and the second frame 50 is overlapped on the rear surface side of the pieces 15c and 19b. By doing so, even if the mounting screw 25 is removed, the receiving pieces 15c can receive the loads of the first mount 40 and the second mount 50.
[0016]
  In a state where the mounting screws 25 are inserted into the groove portions of the mounting holes 41a and 51a, the position of the retaining boss 14c is set so that the retaining boss 14c is inserted into the large diameter portion of the mounting holes 41a and 51a. After tightening, the support pieces 41 and 51 are prevented from rotating with respect to the box body 10. Further, by inserting the retaining boss 14c into the large diameter portions of the mounting holes 41a and 51a, it is possible to prevent the support pieces 41 and 51 from rattling against the box body 10 even if the mounting screw 25 is somewhat loosened. For example, even if the mounting screw 25 is loosened due to an external vibration such as an earthquake, the first mount 40 and the second mount 50 can be prevented from moving or dropping from the box body 10.
[0017]
  The first mount 40 is formed of a sheet metal (iron plate) in a vertically long rectangular shape whose vertical width is smaller than the vertical width of the opening window 13 formed in the box body 10. As shown in FIG. 5, a pair of upper and lower support pieces 41 project from the left edge of the first mount 40, and a pair of upper and lower connection pieces 42 project from the right edge. The connection piece 42 is formed with a keyhole-like connection hole 42a similar to the support piece 41, and a stop hole 42b is formed adjacent to the right side of the connection hole 42a. The main switch 31 is attached to the first mount 40 using a fixing screw 43.
[0018]
  In the present embodiment, the main switch 31 is not passed from the power supply side (primary side) of the main switch 31 so that the power to the fire alarm can be secured even when the main switch 31 is shut off. A power supply system for obtaining power is provided, and a primary feed switch (primary feed breaker) 33 as an internal unit housed in the box body 10 is inserted into the power supply system. The primary feed switch 33 has the same configuration as the branch switch 32 and is attached to a rectangular auxiliary mounting plate 60 that is long in the vertical direction and connected to the left end portion of the first mount 40 using a connection screw 63. . The primary feed switch 33 is disposed in contact with the main switch 31 so that the primary feed switch 33 can be easily positioned. Further, in the upper half of the auxiliary mounting plate 60 in the longitudinal direction, one voltage electrode and a neutral electrode of the power supply side terminal (not shown) of the primary feed switch 33 and the power supply side terminal 31b of the main switch 31 are provided. Are connected via a connection line 74.
[0019]
  The second gantry 50 to which the branch switch 32 is attached is formed by sheet metal (iron plate) in the shape shown in FIG. 6, and support pieces 51 project from the upper end and lower end of the right end edge, and the left end edge A connecting piece 52 projects from the upper end and the lower end. The support piece 51 is formed with the keyhole-shaped mounting hole 51a as described above, but the connection piece 52 is provided with a connection protrusion 52a, and a set screw hole 52b is formed near the right side of the connection protrusion 52a. Yes. The connection protrusion 52a is inserted into the large diameter portion of the connection hole 42a provided in the connection piece 42 of the first mount 40, and the connection screw 53 (see FIG. 3) is screwed into the set screw hole 52b through the set hole 42b.
[0020]
  Therefore, the connecting piece 42 of the first mount 40 is overlapped on the front side of the connecting piece 52 of the second mount 50, the connecting protrusion 52a is inserted into the connecting hole 42a, and the connecting screw 53 is set through the set hole 42b. The first gantry 40 and the second gantry 50 are coupled to each other by being screwed together. With this configuration, it is possible to prevent the first mount 40 and the second mount 50 from coming off even if the connecting screw 53 is somewhat loosened.
[0021]
  By the way, four rectangular through holes 54 on the left and right sides are formed in the central portion of the second frame 50 in the vertical direction, and are held at substantially the same positions as the through holes 54 in the horizontal direction at both upper and lower ends of the second frame 50. A hole 55 is formed. The through hole 54 and the holding hole 55 are used for attaching a bar support member 80 made of a synthetic resin molded product placed on the front surface side of the second frame 50. The holding hole 55 is formed in the shape of a long hole whose vertical dimension is larger than the horizontal dimension, and is formed in a shape in which a retaining piece 55a projects from either the left or right side edge at the lower end.
[0022]
  As shown in FIG. 7, the bar support member 80 has a partition wall 81 at the center in the vertical direction. The partition wall 81 projects forward and extends in the left-right direction, and support posts 82 projecting forward are formed at both ends of the partition wall 81 in the left-right direction. A recess 82a is formed on the front surface (upper surface in FIG. 7) of the support post 82, and a nut (not shown) is held at the bottom of the recess 82a. Further, a positioning protrusion 82b is provided on the front surface of the support post 82 in the vicinity of the recess 82a. A partition wall 81a is integrally formed on the partition wall 81 of the bar support member 80, and the partition wall 81 is divided into eight sections by the separation wall 81a.
[0023]
  The bar support member 80 has upper and lower mounting pieces 84 extending vertically, and two left and right recesses 84a are formed in the left and right ends of each mounting piece 84. A nut (not shown) is held at the bottom. A stepped portion 85 whose back side is retracted is formed at the upper and lower intermediate portions of each mounting piece 84, and eight locking portions 86 arranged in the left-right direction stand between the stepped portion 85 and the partition wall 81. Established. The locking portion 86 is located in the middle of each section divided by the separation wall 81a in the left-right direction, and a holding claw 86a that protrudes toward the partition wall 81 at the front end of each locking portion 86 (see FIG. 9). Is formed. Furthermore, hooking claws 81b are projected from every other four separation walls 81a. The hooking claw 81 b protrudes upward on the separation wall 81 a above the partition wall 81 and protrudes downward on the lower side of the partition wall 81. Further, a holding claw 85 a is projected from the surface of the step portion 85 that faces the partition wall 81. Eight breaker mounting pieces 87 are juxtaposed on the upper end edge of the mounting piece 84 on the upper side of the partition wall 81 and the lower end edge of the mounting piece 84 on the lower side of the partition wall 81. The function of the circuit breaker mounting piece 87 will be described later.
[0024]
  By the way, the above-mentioned hooking claw 81 b in the bar support member 80 is formed by a method of forming an undercut portion using a slide core inserted through the mounting piece 84. Therefore, the mounting piece 84 is formed with a through hole 81c for passing through the slide core. Further, as shown in FIG. 8, a boss portion 81d protrudes rearward from the rear surface of the mounting piece 84 around each through hole 81c. On the rear surface of the mounting piece 84, four slide pieces 88, each having four upper and lower portions, each having a L-shaped cross section in the left-right direction are projected. The vertical dimension of the slide piece 88 is set such that the slide piece 88 can be inserted into a portion above the retaining piece 55 a in the holding hole 55 provided in the second frame 50. The mounting piece 84 has a plurality of confirmation holes 84b that allow the front end of each slide piece 88 to be visually recognized from the front.
[0025]
  Thus, when attaching the bar support member 80 to the second mount 50, after inserting the slide piece 88 into the upper portion of the holding hole 55, the bar support member 80 is attached to the second mount 50 as shown in FIG. When slid downward, the slide piece 88 engages with the retaining piece 55 a, and the bar support member 80 is coupled to the second frame 50. Further, in a state where the bar support member 80 is coupled to the second pedestal 50, the boss portion 81d is inserted into the through hole 54, the attachment strength of the bar support member 80 to the second pedestal 50 is increased, and the creeping surface passing through the through hole 81c. The distance can be increased as compared with the case where the boss portion 81d is not provided. That is, as will be described later, since the conductive bars 90b and 90c are mounted on the mounting piece 84, the creepage distance between the conductive bars 90b and 90c and the second mount 50 can be increased by providing the boss portion 81d. It can be taken big.
[0026]
  The bar support member 80 can simultaneously hold three conductive bars 90a to 90c including a neutral electrode conductive bar 90a and two voltage electrode conductive bars 90b and 90c, and the voltage electrode conductive bars 90b and 90c have a width. The two different types of conductive bars 90b and 90c can be selectively used. That is, since the conductive bars 90b and 90c having different widths are selected according to the current capacity, the conductive bars used when the current capacity is large as compared to selecting the conductive bars 90b and 90c having different thicknesses according to the current capacity. The surface areas of 90b and 90c can be increased, and the heat dissipation effect can be improved. However, in the illustrated example, an example using narrow conductive bars 90b and 90c is shown.
[0027]
  The neutral electrode conductive bar 90 a is installed between the two support posts 82. Insertion holes 91 are formed in the conductive bar 90a at equal pitches in the longitudinal direction. A terminal piece 92 extends from both ends of the conductive bar 90a, and a terminal hole 94 into which a terminal screw 93 (see FIG. 3) is inserted is formed in the terminal piece 92. The terminal screw 93 is screwed into a nut provided at the bottom of the recess 82 a, whereby the conductive bar 90 a is fixed to the support post 82.
[0028]
  On the other hand, the conductive bars 90 b and 90 c of the voltage electrode are arranged on the front surface of the mounting piece 84 above and below the partition wall 81, respectively. Terminal holes 95 are respectively formed at both ends in the longitudinal direction of the conductive bars 90b and 90c. A terminal screw 96 (see FIG. 3) is inserted into the terminal hole 95, and the terminal screw 96 is screwed into a nut held at the bottom of the recess 84 a provided in the mounting piece 84. Furthermore, a connecting piece 97 projects forward from one side edge of the conductive bars 90b and 90c in the short direction. Two insertion terminal pieces 97a and 97b are extended on the connection piece 97, and one insertion terminal piece 97a extends in a direction orthogonal to the connection piece 97 from the connection piece 97 so as to face the conductive bars 90b and 90c. The other insertion terminal piece 97b is extended in a direction orthogonal to the connection piece 97 so as to be separated from the conductive bars 90b and 90c. Further, the distance from the conductive bars 90b and 90c to the insertion terminal piece 97b is larger than the distance to the insertion terminal piece 97a. Therefore, the insertion terminal pieces 97a and 97b are positioned forward and backward. Further, in a state where the conductive bars 90b and 90c are attached to the mounting piece 84, the insertion terminal pieces 97b and 97a provided on the other conductive bars 90b and 90c are positioned forward and backward, and both the insertion terminal pieces 97a and 97b It is positioned so that the position of the leading edge is aligned vertically and horizontally. With such an arrangement, the two insertion terminal pieces 97b, 97a arranged in the front-rear direction are connected to the other conductive bars 90b, 90c. Here, the edge in the short-side direction of the conductive bar 90a of the neutral electrode attached to the support post 82 also coincides with the tip edge of both insertion terminal pieces 97a and 97b in the vertical direction. The connection pieces 97 provided on the different conductive bars 90 b and 90 c are insulated by the partition wall 81.
[0029]
  By the way, a notch 98 having a shape matching the corner of the support post 82 is formed at both ends of the conductive bars 90b and 90c in the longitudinal direction. Therefore, the conductive bars 90 b and 90 c are positioned in the left-right direction with respect to the bar support member 80 by engaging the notch 98 and the support post 82. Also, one end of the conductive bars 90b and 90c in the short direction is held between the hooking claw 81b provided on the separation wall 81a and the mounting piece 84, and the other end is a holding claw 86a provided on the locking portion 86. And the mounting piece 84.
[0030]
  Therefore, in order to attach the conductive bars 90b and 90c to the bar support member 80, one end of the conductive bars 90b and 90c is inserted between the hooking claw 81b and the mounting piece 84, and the conductive bars 90b and 90c are mounted. When pressed against the piece 84, the other ends of the conductive bars 90b and 90c are held between the holding claw 86a of the locking portion 86 and the mounting piece 84. When wide conductive bars 90b and 90c are used, locking holes into which the locking portions 86 are inserted are formed in the conductive bars 90b and 90c, and one ends of the conductive bars 90b and 90c in the short direction. Is held between the hooking claw 81 b provided on the separation wall 81 a and the mounting piece 84, and the other end is held between the holding claw 85 a provided on the stepped portion 85 and the mounting piece 84. .
[0031]
  The conductive bars 90 a to 90 c attached to the bar support member 80 as described above are electrically connected to the load side terminal 31 c of the main switch 31. The load-side terminal 31c of the main switch 31 and the conductive bars 90a, 90b, 90c are connected so as not to be detached by using terminal screws 93, 96, 96.
[0032]
  The conductive bars 90a to 90c are provided to connect the branch switches 32. As described above, eight branch switches 32 are arranged in two upper and lower stages. The branch switch 32 has the same shape as the primary feed switch 33, and is provided with three slit-shaped terminal portions 37a to 37c as shown in FIGS. Among the terminal portions 37a to 37c, the neutral electrode conductive bar 90a is inserted into the terminal portion 37a, and the insertion terminal pieces 97b and 97a of the voltage electrode conductive bars 90b and 90c are inserted into the terminal portions 37b and 37c. That is, a so-called plug-in type is used for the branch switch 32. However, each branch switch 32 is electrically connected to only two of the respective conductive bars 90a to 90c, and the other one is treated as a dummy. For example, in the example shown in FIG. 9, the receiving blades 35a and 35c are provided only in the terminal portions 37a and 37c, the conductive bar 90a is connected to the terminal portion 37a, and the insertion terminal piece 97a is connected to the terminal portion 37c. However, the insertion terminal piece 97b is merely inserted into the terminal portion 37b and is not electrically connected.
[0033]
  As described above, the bar support member 80 is provided with the circuit breaker mounting piece 87, and the circuit breaker support piece 89 is provided on the front surface of the bar support member 80 at a portion corresponding to each circuit breaker holding piece 87. Projected. A holding groove 38 that engages with the circuit breaker holding piece 87 is opened on one side surface of the branch switch 32. Further, two bundling projections 39 project from the front surface of the branch switch 32 and at the end near the partition wall 81.
[0034]
  Therefore, when the branch switch 32 is attached to the bar support member 80, the conductive bar 90a is inserted into the terminal portion 37a, and the insertion switch pieces 97b and 97a are not inserted into the terminal portions 37b and 37c. Is inserted in the holding groove 38 of the branch switch 32, and the insertion terminal pieces 97b, 97a are inserted into the terminal portions 37b, 37c from the state where the insertion terminal pieces 97b, 97a are shifted in the width direction. Then, the branch switch 32 is slid. At this time, the circuit breaker support piece 89 abuts against the side surface of the branch switch 32 to prevent the position of the branch switch 32 from being displaced.
[0035]
  As described above, in the state where the branch switch 32 is fixed to the bar support member 80, a gap of about the vertical width of the separation wall 81a is formed between the upper and lower branch switches 32. A bundling member 100 is attached to the front surface of the branch switch 32 so as to cover this gap. The bundling member 100 has a length corresponding to the width of the eight branch switches 32 and includes insertion legs 101 inserted into a gap formed between the upper and lower branch switches 32. The bundling member 100 includes a press-fitting protrusion 102 that is press-fitted into the insertion hole 91 of the conductive bar 90a, and the bundling member 100 is fixed to the conductive bar 90a by being press-fitted into the insertion hole 91. The bundling member 100 is formed with a bundling piece 103 that extends to a portion that overlaps the front surface of each of the upper and lower branch switches 32, and a notch groove 104 provided at the tip of the bundling piece 103 projects from the front side of the branch switch 32. The upper and lower branch switches 32 are connected to the binding member 100 by engaging with the binding protrusions 39 formed. By providing the binding member 100, the branch switches 32 are connected via the binding member 100. Although not described in detail because it is not a gist, the binding piece 103 of the binding member 100 is configured to be able to release the engagement state between the notch groove 104 and the binding protrusion 39 for each branch switch 32.
[0036]
  As described above, the main switch 31 and the primary feed switch 33 are attached to the first base 40, and the branch switch 32 is attached to the second base 50. In the present embodiment, the first base 40 A plurality of breakers (main switch 31, branch switch 32, and primary feed switch 33) are arranged on the front side by 40 and the second pedestal 50 to constitute a substrate that is housed inside the box body 10. . The branch switch 32 and the primary feed switch 33 have the same configuration and use the same moving range when the handles 32a and 33a are opened and closed. The main switch 31, the branch switch 32, and the primary feed switch 33 are all arranged so that the handles 31 a to 33 a are on the front side, and the moving direction when the handles 31 a to 33 a are opened and closed is the vertical direction. It is arranged to become. The upper and lower branch switches 32 are arranged so that the upper and lower positional relationship between the opening operation position and the closing operation position of the handle is reversed. This is realized by using the same structure for the upper and lower branch switches 32 and disposing the conductive bars 90a to 90c between the upper and lower branch switches 32 in the positional relationship described above. In other words, while the branch switches 32 are arranged in two upper and lower stages, the conductive bars 90a to 90c are arranged between the branch switches 32 in the upper and lower stages, and the main switch 31 and the branch switch 32 Can be disposed in the box body 10 in a space-saving manner. The electric wire connected to the power supply side terminal 31b of the main switch 31 and the electric wire connected to the load side terminal of the branching switch 32 pass through the wiring opening window 13 opened in the back plate 11 of the box main body 10 and the box main body. 10 is introduced.
[0037]
  By the way, standing walls 56 (see FIG. 9) are formed on the upper and lower edges of the second frame 50 described above, and the upper and lower edges of the bar support member 80 are respectively provided on the rear. A standing wall 83 (see FIGS. 7 to 9) is formed. The longitudinal dimension of each of the standing walls 56 and 83 is set substantially equal to the step of the step portion 85 provided on the mounting piece 84 of the bar support member 80. Here, prismatic rods 120 made of aluminum are disposed between the standing walls 56 and 83 facing each other.
[0038]
  Each bar 120 is interposed between the branch switch 32 and the second frame 50, the front surface of the bar 120 abuts against the rear surface of the branch switch 32, and the rear surface of the bar 120 contacts the second frame 50. It touches. Each rod 120 has an end on the side where the load side terminal is provided in each of the branch switches 32 at the upper and lower stages (the end opposite to the end on which the terminal portions 37a to 37c are formed). Part). Therefore, the heat generated at the load side terminal of the branch switch 32 can be transmitted to the second frame 50 via the rod body 120 made of aluminum having a higher thermal conductivity than the iron plate. Here, the branch switch 32 is a lock that holds the wire conductor between the terminal plate and the terminal plate to which the wire conductor inserted from the outside is connected, like the conventional branch switch 32 '. A so-called quick-connection terminal comprising a spring is provided as a load-side terminal, and a contact point inserted in an electric path between the power-side terminal and the load-side terminal and housed in the body, A bimetal that is deformed so that the contact is forcedly opened when an overcurrent flows by being deformed according to the energization amount to the electric path is housed in the body.
[0039]
  Each rod 120 described above is disposed on the front side of each of the upper and lower ends of the second frame 50 so that the extending direction of the conductive bars 90a to 90c, that is, the left-right direction is the longitudinal direction. Here, as described above, the mounting hole 51a is formed in the support piece 51 of the second pedestal 50. In the vicinity of the left side of the mounting hole 51a, the movement of the rod 120 in the right direction is restricted. A set screw 58 is attached. On the other hand, part of the right end surface (one end surface in the longitudinal direction) of the rod 120 abuts on the positioning screw 58, and a part of the left end surface (the other end surface in the longitudinal direction) projects from the first mount 40. The dimension in the longitudinal direction is set so as to contact the right end edge of the connecting piece 42. Therefore, the movement of the rod 120 in the left-right direction is restricted by the connecting piece 42 and the positioning screw 58, the movement in the front-rear direction is restricted by the branch switch 32 and the second mount 50, and the movement in the up-down direction is established. It is restricted by the installation walls 56 and 83.
[0040]
  By the way, on the back side of the second frame 50, a heat dissipating block 110 attached to the back plate 11 of the box body 11 is arranged so as to abut on the back surface of the second frame 50 at an intermediate portion of the opening window 13 in the horizontal direction. It is installed. The heat dissipating block 110 is formed by overlapping a plurality of heat dissipating members 111 having a shape as shown in FIGS. 11 and 12 in the thickness direction and connecting them with connecting pins 112. The heat dissipating member 111 is an elongated flat plate heat dissipating plate 111a whose one side edge is in contact with the back surface of the second pedestal 50, and the heat dissipating member 111a protrudes from the other side edge in the short direction of the heat dissipating plate 111a. And a large number of fins 111b arranged at an equal pitch. Here, each heat radiating member 111 sets the width of the fin 111b in the longitudinal direction of the heat radiating plate 11 and the distance between adjacent fins 111b to the same value, and further, from one end in the longitudinal direction of the heat radiating plate 111a to the fin 111b. And the distance from the other end in the longitudinal direction of the heat radiating plate 111a to the fin 111b are different from each other by half of the pitch. Further, the heat radiating plate 111a is formed in a form in which a plurality of protrusions 114 arranged along the longitudinal direction are alternately ejected on one surface side and the other surface side in the thickness direction. In other words, the protrusion 114 is formed by punching a part of the heat radiating plate 111a in the thickness direction, and the heat radiating plate 111a is formed at a portion overlapping the protrusion 114 on the surface opposite to the surface on which the protrusion 114 is provided. A hole 115 formed at the time of launching is provided.
[0041]
  On the other hand, in the heat dissipation block 110, when a plurality of (five in the illustrated example) heat dissipating members 111 are arranged side by side in the thickness direction of the heat dissipating plate 111a, adjacent heat dissipating members in the thickness direction of the heat dissipating plate 111a. The members 111 are arranged side by side so that both end portions in the longitudinal direction of the heat radiation plate 111a are reversed. Therefore, even if the positions of both end faces in the longitudinal direction of the adjacent heat radiating member 111 are aligned, the fins 111b do not overlap in the thickness direction of the heat radiating plate 111a when viewed from the adjacent heat radiating member 111. As compared with the case where the fin 111b overlaps in the thickness direction of the heat radiating plate 111a, the heat radiating area can be increased and the heat radiating effect can be improved. Further, as described above, the plurality of projections 114 are provided on both surfaces of the heat dissipation plate 111a in the thickness direction, so that the projections 114 are interposed between the heat dissipation plates 111a adjacent to each other in the thickness direction. Since a gap is formed, the heat dissipation area can be further increased, and the heat dissipation effect can be further improved.
[0042]
  When manufacturing the above-described heat radiating member 111, both end portions in the longitudinal direction of the two heat radiating members 111 are reversed, and the fin 111 b of the other heat radiating member 111 is sandwiched between the adjacent fins 111 b of one heat radiating member 111. By punching and forming in a shape, chips are reduced, and the material for forming the heat dissipation member 111 can be used effectively without waste. Moreover, since the protrusion 114 can be formed after the heat radiation member 111 having the heat radiation plate 111a and the fins 111b is formed by punching a flat plate material, the manufacturing work of the heat radiation member 111 is facilitated.
[0043]
  By the way, the heat sink 111a of each heat radiating member 111 is provided with a plurality of connection holes 113 penetrating in the thickness direction and through which the above-described connection pins 112 are inserted along the longitudinal direction. A plurality of heat dissipating members 111 are connected by inserting the connecting pins 112 with the heat dissipating plates 111a of the individual heat dissipating members 111 being overlapped as described above and caulking the tips of the connecting pins.
[0044]
  The heat dissipating block 110 configured as described above is such that one end edge of each heat dissipating plate 111a becomes the front side and the one end edge of each heat dissipating plate 111a abuts the back surface of the second mount 50, that is, the fin 111b. Is attached to the back plate 11 of the box body 10 using two metal mounting members 117. The mounting member 117 includes a pressing piece 117a that sandwiches the longitudinal end portion of the heat dissipation block 110 between the mounting protrusion 117 and the holding piece 117b that contacts the left side surface of the heat dissipation block 110. It protrudes from one side edge (left side edge in FIG. 1) toward the rear, and is formed in a shape in which a mounting piece 117d is provided from the other side edge (right side edge in FIG. 1) via a stepped portion 117c. ing. Here, the mounting piece 117d of the mounting member 117 is inserted with mounting screws 118 (see FIG. 3) that are screwed into the above-described through holes 16 formed on the upper and lower peripheral edges of the opening window 13 of the back plate 11. A hole (not shown) is formed. In the present embodiment, the heat dissipation block 110 is configured by connecting a plurality of heat dissipation members 111 using the connection pins 112, but only one heat dissipation member 111 may be used. In addition, the through hole 16 constitutes an attachment portion for attaching the heat radiating member 111 (in this embodiment, the heat radiating block 110). Further, as described above, the first gantry 40 and the second gantry 50 constitute a substrate.
[0045]
  This embodimentstateThen, since the heat dissipation member 111 (heat dissipation block 110) is disposed so as to be in contact with the back surface of the substrate and dissipates heat transmitted from the branch switch 32 to the substrate, the heat generated from the branch switch 32 is applied to the substrate. Since the heat of the board can be quickly dissipated by the heat radiating member 111, the heat in the vicinity of the branch switch 32 is easily released, and the tripping characteristic of the branch switch 32 is stabilized. Moreover, since the rod body 120 formed of aluminum is interposed between the branch switch 32 and the second frame 50 as described above, the heat radiation area between the branch switch 32 and the second frame 50. Since the heat generated by the branch switch 32 can be transmitted to the second gantry 50 more quickly, it is easy to radiate the heat by the fins 111b of the heat radiating member 111.
[0046]
  Moreover, on the back plate 11 of the box body 10, a plurality of attachment portions for attaching the heat radiating member 111 (heat radiating block 110) are juxtaposed in the extending direction of the conductive bars 90a to 90c (the left-right direction in FIG. 3). Therefore, the position where the heat radiating member 111 (heat radiating block 110) is attached can be changed in the extending direction of the conductive bars 90a to 90c, and the heat radiating member 111 (heat radiating block 110) is attached according to the number of branch switches 32. The wearing position can be changed as appropriate, and when the number of branch switches 32 is large, the number of branch switches 32 can be increased by attaching the heat radiation member 111 (heat radiation block 110) to each of a plurality of positions. In spite of the large number, the heat in the vicinity of each branch switch 32 can be quickly released. Here, since the heat radiating member 111 is made of aluminum, the heat radiating member 111 has a higher thermal conductivity than the case where, for example, an iron plate is used, and easily absorbs heat. Thus, it is possible to absorb quickly, and the influence of heat generated by the branch switch 32 on the tripping characteristics can be further reduced. Moreover, since the weight can be reduced as compared with the case where, for example, an iron plate is used as the heat radiating member 111, the increase in the weight of the distribution board due to the provision of the heat radiating member 111 can be reduced. You can reduce the risk of doing it.
[0047]
【The invention's effect】
  The invention of claim 1A box body having a front opening whose entire periphery of the back plate is surrounded by a side plate, a lid attached to the front surface of the box body, and a plurality of breakers are disposed on the front side and stored inside the box body A conductive member connected to the main breaker and the load-side terminal of the main breaker as the plurality of breakers; and a heat dissipating member that dissipates heat transmitted from the breaker to the substrate. A branch breaker that is juxtaposed in the extending direction and whose power supply side terminal is electrically connected to the main breaker via a conductive bar, and the heat dissipation member is attached to the back plate on both sides in a direction perpendicular to the extending direction of the conductive bar. The back plate is provided with a plurality of attachment portions for attaching the heat dissipation member, and the attachment portion can change the position of attaching the heat dissipation member in the extending direction of the conductive bar. In the direction of extension of the conductive bar Formed by setBecause the heat generated from the breaker is transferred to the substrate and the heat from the substrate can be quickly dissipated by the heat radiating member, the heat in the vicinity of the breaker is easily released and the tripping characteristics of the breaker are stabilized.. Further, since the position where the heat radiating member is attached can be changed in the extending direction of the conductive bar, the position where the heat radiating member is attached can be appropriately changed according to the number of breakers, and the number of breakers can be changed. If there are many, installing heat dissipation members at multiple positions makes it possible to quickly release the heat near the breakers despite the large number of breakers.There is an effect.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a distribution board in an embodiment.
FIG. 2 is a front view of the above.
FIG. 3 is a front view showing a state in which the lid is removed.
FIG. 4 is a longitudinal sectional view of the above.
FIG. 5 is a front view of the main part of the above.
FIG. 6 is an exploded perspective view of the main part of the above.
FIG. 7 is an exploded perspective view of the main part of the above.
FIG. 8 is a perspective view showing a bar support member used in the above.
FIG. 9 is a longitudinal sectional view of the main part of the above.
FIG. 10 is a front view in which the main part is partially broken.
FIG. 11 is an exploded perspective view in which the main part is partially broken.
FIG. 12 is a cross-sectional view in which the main part is partially broken.
FIG. 13 is a front view showing a conventional example with a lid removed.
FIG. 14 is a front view of the above.
FIG. 15 is a sectional view of the main part of the above.
FIG. 16 is an exploded perspective view of the main part of the above.
FIG. 17 is an exploded perspective view of the main part of the above.
[Explanation of symbols]
  1 box
  10 Box body
  11 Backboard
  12 Side plate
  13 Open window
  16 through hole
  18 Reinforcing ridge
  20 Lid
  31 Main switch
  31a Handle
  31b Power supply terminal
  31c Load side terminal
  32 Branch switch
  32a handle
  33 Primary feed switch
  33a Handle
  40 First stand
  50 Second stand
  90a-90c conductive bar
  110 Heat dissipation block
  111 Heat dissipation member
  111a Heat sink
  111b fin
  112 Connecting pin
  114 protrusion

Claims

A box body having a front opening whose entire periphery of the back plate is surrounded by a side plate, a lid attached to the front surface of the box body, and a plurality of breakers are disposed on the front side and stored inside the box body A conductive member connected to the main breaker and the load-side terminal of the main breaker as the plurality of breakers, and a heat dissipating member that dissipates heat transmitted from the breaker to the substrate. A branch breaker that is juxtaposed in the extending direction and whose power supply side terminal is electrically connected to the main breaker via a conductive bar, and the heat dissipation member is attached to the back plate on both sides in a direction perpendicular to the extending direction of the conductive bar. The back plate is provided with a plurality of attachment portions for attaching the heat radiating member, and the attachment portion can change the position where the heat radiating member is attached in the extending direction of the conductive bar. In the direction of extension of the conductive bar Panelboard characterized by comprising been set.