JP2013152847A - Circuit breaker for wiring - Google Patents

Circuit breaker for wiring Download PDF

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JP2013152847A
JP2013152847A JP2012012986A JP2012012986A JP2013152847A JP 2013152847 A JP2013152847 A JP 2013152847A JP 2012012986 A JP2012012986 A JP 2012012986A JP 2012012986 A JP2012012986 A JP 2012012986A JP 2013152847 A JP2013152847 A JP 2013152847A
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intermediate case
fixed contact
circuit breaker
protection member
wiring
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JP5957715B2 (en
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Hiroyuki Okamura
浩之 岡村
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Nitto Kogyo Co Ltd
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Nitto Kogyo Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a circuit breaker for wiring which protects an intermediate case located near a fixed contact from an arc gas thereby preventing the insulation deterioration without increasing the number of components.SOLUTION: A circuit breaker for wiring includes: an intermediate case 1 to which an opening/closing mechanism part and a fixed contact 9 are attached and fixed; and left and right cases 2 covering the intermediate case 1. An intermediate case protective member 14, protecting the intermediate case from an arc gas, is provided in a space between the fixed contact 9 and the intermediate case 1 located near the fixed contact 9 so as to be separated from the intermediate case 1. This structure increases a creepage distance and a space distance between the fixed contact 9 and the intermediate case 1 located near the fixed contact 9 and thus prevents the insulation deterioration due to the arc gas traveling from a space enclosed by insulators in a direction of an exhaust hole.

Description

本発明は、短絡遮断時に発生するアークガスによる中間ケースの絶縁劣化を防止した配線用遮断器に関するものである。   The present invention relates to a circuit breaker for wiring in which insulation deterioration of an intermediate case due to arc gas generated when a short circuit is interrupted is prevented.

配線用遮断器は、回路に短絡電流などの大電流が流れたことを検出すると接点を開放して電流を遮断する機能を有する機器であるが、接点開放時に固定接点と可動接点との間にアーク放電が生じ、アークガスが発生することがある。発生したアークガスは高温で固定接点と可動接点との間の空間に充満し、絶縁物で囲まれた空間から排気孔の方向に移動する。このためアークガスが絶縁物により構成された固定接触子を固定取付した絶縁部の絶縁劣化を招く。   The circuit breaker for wiring is a device that has a function of opening the contact and cutting off the current when it detects that a large current such as a short circuit current has flowed in the circuit. Arc discharge may occur and arc gas may be generated. The generated arc gas fills the space between the fixed contact and the movable contact at a high temperature, and moves from the space surrounded by the insulator toward the exhaust hole. For this reason, the insulation deterioration of the insulation part which fixedly attached the stationary contact in which arc gas was comprised with the insulator is caused.

そこで特許文献１に示すように、配線用遮断器の内部に消弧装置を組み込んで発生したアークを消滅させたり、配線用遮断器を構成する絶縁物をアークから保護する保護部材を設けたりすることが行われている。   Therefore, as shown in Patent Document 1, an arc extinguishing device is incorporated in the circuit breaker for wiring to extinguish the generated arc, or a protective member for protecting the insulator constituting the circuit breaker for wiring from the arc is provided. Things have been done.

しかし、アークの発生時には接点部分が非常に高温になるため、消弧装置を設けて発生したアークを消滅させても、固定接点を支持している中間ケースに絶縁劣化が生ずるおそれがあった。   However, since the contact portion becomes very hot when the arc is generated, there is a possibility that even if the arc generated by disposing the arc extinguishing device is extinguished, insulation deterioration may occur in the intermediate case supporting the fixed contact.

また、固定接点の周囲に別の保護部材を組み込む場合には部品点数が増加し、組み立ての工数も増加するため、コストアップにつながるという問題があった。   Further, when another protective member is incorporated around the fixed contact, the number of parts increases and the number of assembling steps also increases, leading to a problem of increasing costs.

特開２００３−２９７２１５号公報JP 2003-297215 A

従って本発明の主な目的は上記した従来の問題点を解決し、固定接点の周辺の中間ケースをアークガスから保護して絶縁劣化を防止することができる配線用遮断器を提供することである。また本発明の他の目的は、部品点数を増加させることなく、中間ケースの絶縁劣化を防止できる配線用遮断器を提供することである。   Accordingly, a main object of the present invention is to provide a circuit breaker for wiring which can solve the above-mentioned conventional problems and protect an intermediate case around a fixed contact from arc gas to prevent insulation deterioration. Another object of the present invention is to provide a wiring breaker that can prevent insulation deterioration of the intermediate case without increasing the number of components.

上記の課題を解決するためになされた本発明は、開閉機構部及び固定接触子が取付固定された中間ケースと、この中間ケースを覆う左右のケースとを備えた配線用遮断器において、固定接触子とその近傍の中間ケースとの間の空間内に、アークガスから中間ケースを保護する中間ケース保護部材を、中間ケース部から分離させて設けたことを特徴とするものである。   In order to solve the above problems, the present invention provides a circuit breaker having a fixed contact in an intermediate case in which an opening / closing mechanism and a fixed contact are attached and fixed, and a left and right case covering the intermediate case. An intermediate case protection member for protecting the intermediate case from the arc gas is provided in a space between the child and the adjacent intermediate case separately from the intermediate case portion.

なお、前記中間ケース保護部材が、左右のケースの内面に突設されたものであることが好ましく、固定接触子の先端を中間ケース部より浮き上がらせて形成し、前記中間ケース保護部材が固定接触子の下側を覆う形状であることが好ましい。   It is preferable that the intermediate case protection member is protruded from the inner surfaces of the left and right cases, and the tip of the fixed contact is formed so as to be lifted from the intermediate case portion, and the intermediate case protection member is fixedly contacted. It is preferable that the shape covers the lower side of the child.

本発明の配線用遮断器は、固定接触子とその近傍の中間ケースとの間の空間内に、アークガスから中間ケースを保護する中間ケース保護部材を、中間ケースから分離させて設けたものであるから、固定接触子と中間ケースとの沿面距離及び空間距離を長くすることができ、アークが中間ケースの表面に沿って移動することを遮断できる。   The circuit breaker for wiring according to the present invention is provided with an intermediate case protection member for protecting the intermediate case from arc gas, separated from the intermediate case, in a space between the stationary contact and the intermediate case in the vicinity thereof. Thus, the creeping distance and the spatial distance between the fixed contact and the intermediate case can be increased, and the arc can be prevented from moving along the surface of the intermediate case.

また中間ケース保護部材は中間ケースから分離させてあるので中間ケース保護部材を経由してアークが連続することもなく、中間ケースの絶縁劣化を防止することができる。さらに請求項２のように中間ケース保護部材を左右のケースの内面に突設した構造とすれば、部品点数の増加や組み立て工数の増加もない。   Further, since the intermediate case protection member is separated from the intermediate case, the arc does not continue through the intermediate case protection member, and insulation deterioration of the intermediate case can be prevented. Further, if the intermediate case protection member is provided so as to protrude from the inner surfaces of the left and right cases as in claim 2, there is no increase in the number of parts and the number of assembly steps.

実施形態の配線用遮断器の分解斜視図である。It is a disassembled perspective view of the circuit breaker for wiring of embodiment. 左ケースを開いた状態の斜視図である。It is a perspective view of the state which opened the left case. 要部の側面図である。It is a side view of the principal part. 中間ケース保護部材の形状を示す左右のケースの斜視図である。It is a perspective view of the right and left cases showing the shape of the intermediate case protection member. 中間ケース保護部材と左右のケースを省略した要部の斜視図である。It is the perspective view of the principal part which abbreviate | omitted the intermediate case protection member and the right and left cases. 中間ケース保護部材と左右のケースと固定接触子を省略した要部の斜視図である。It is a perspective view of the principal part which abbreviate | omitted the intermediate case protection member, the right and left cases, and the stationary contact. 本発明におけるアークガスの伝わり方を示す説明図である。It is explanatory drawing which shows how to transmit the arc gas in this invention.

以下に本発明の実施形態を示す。
図１は本発明の配線用遮断器の分解斜視図であり、この図に示すように、本発明の配線用遮断器は中間ケース１と、左右のケース２により外郭を形成し、その内部に開閉機構部などを組み込んだ構造である。左右のケース２はビス３によって相互に固定される。なおこれらの中間ケース１と左右のケース２はともに、絶縁性の樹脂により成形されたものである。 Embodiments of the present invention will be described below.
FIG. 1 is an exploded perspective view of a circuit breaker according to the present invention. As shown in this figure, the circuit breaker according to the present invention has an outer case formed by an intermediate case 1 and left and right cases 2. The structure incorporates an opening and closing mechanism. The left and right cases 2 are fixed to each other by screws 3. The intermediate case 1 and the left and right cases 2 are both formed of an insulating resin.

開閉機構部はバイメタル４、トリガレバー５、ハンドル６、クロスバー７等からなり、過電流を検出したときに可動接触子８を固定接触子９から上昇させ、可動接点１０を固定接点１１から引き離して回路を遮断することは従来と同様である。なお、本実施形態の配線用遮断器はプラグイン型であるため、電源側には複数のプラグ部１２が設けられ、図示しない母線バーにプラグイン接続される構造となっている。   The opening / closing mechanism is composed of a bimetal 4, a trigger lever 5, a handle 6, a cross bar 7, and the like. When an overcurrent is detected, the movable contact 8 is lifted from the fixed contact 9 and the movable contact 10 is pulled away from the fixed contact 11. The circuit is shut off as before. In addition, since the circuit breaker for wiring of this embodiment is a plug-in type, a plurality of plug portions 12 are provided on the power supply side, and are configured to be plug-in connected to a bus bar (not shown).

図２、図３に示すように、固定接触子９の先端部上面には固定接点１１が形成されており、その上方位置に可動接点１０がある。固定接触子９は中間ケース１の底部上面に固定されているが、図３に示すように固定接触子９の先端は中間ケース１よりも突出し、中間ケース１の底部上面から浮き上がった位置にある。なお図５、図６に示すように固定接触子９の固定接点１１を保持する中間ケース１に一体に形成された固定接点保持部１５を有しており、固定接点１１の先端を浮かせるように形成している。   As shown in FIGS. 2 and 3, a fixed contact 11 is formed on the top surface of the tip of the fixed contact 9, and a movable contact 10 is located above the fixed contact 11. The fixed contact 9 is fixed to the upper surface of the bottom of the intermediate case 1. However, as shown in FIG. . As shown in FIGS. 5 and 6, it has a fixed contact holding portion 15 formed integrally with the intermediate case 1 that holds the fixed contact 11 of the fixed contact 9 so that the tip of the fixed contact 11 is floated. Forming.

図２、図４に示されるように、左右のケース２の内面には中間ケース１の中央隔壁１３に向かって中間ケース保護部材１４が水平に突設されている。この実施形態の中間ケース保護部材１４は図３、図４に示されるように、上下の水平面間を垂直壁で連結した略クランク状の断面形状を備えたもので、左右のケース２を中間ケース１に組み付けた際に、固定接触子９とその近傍の中間ケース１との間の空間内に挿入される構造である。またこの中間ケース保護部材１４は、中間ケース１から分離した位置において上記空間内に挿入される。なお、左右のケース２をビス３によって相互に固定したとき、中間ケース保護部材１４の先端面は中間ケース１の中央隔壁１３に当接するようになっている。   As shown in FIG. 2 and FIG. 4, an intermediate case protection member 14 projects horizontally from the inner surfaces of the left and right cases 2 toward the central partition wall 13 of the intermediate case 1. As shown in FIGS. 3 and 4, the intermediate case protection member 14 of this embodiment has a substantially crank-shaped cross-sectional shape in which upper and lower horizontal planes are connected by a vertical wall. 1 is a structure that is inserted into the space between the stationary contact 9 and the intermediate case 1 in the vicinity thereof when assembled to 1. The intermediate case protection member 14 is inserted into the space at a position separated from the intermediate case 1. When the left and right cases 2 are fixed to each other with screws 3, the front end surface of the intermediate case protection member 14 comes into contact with the central partition wall 13 of the intermediate case 1.

中間ケース保護部材１４は、大電流遮断時に固定接点１１と可動接点１０との間で発生するアークガスから中間ケース１を保護するための部材であり、この実施形態では中間ケース保護部材１４の下側の水平面と垂直壁とによって固定接触子９の先端部下側を覆うようになっている。これによって固定接点１１から下側の中間ケース１にアークが流れることを防止している。   The intermediate case protection member 14 is a member for protecting the intermediate case 1 from arc gas generated between the fixed contact 11 and the movable contact 10 when a large current is interrupted. The lower surface of the fixed contact 9 is covered with the horizontal plane and the vertical wall. This prevents an arc from flowing from the fixed contact 11 to the lower intermediate case 1.

このほか、図７に示すように固定接点１１の近傍の中間ケース１には複数の凹凸部１６をリブ状に形成し、沿面距離を長くしている。これらの凹凸部１６には、大電流遮断時によるガスに対して固定接点１１付近を補強する効果もある。   In addition, as shown in FIG. 7, the intermediate case 1 in the vicinity of the fixed contact 11 is formed with a plurality of concave and convex portions 16 in a rib shape to increase the creepage distance. These concavo-convex portions 16 also have an effect of reinforcing the vicinity of the fixed contact 11 against a gas generated when a large current is interrupted.

次に本発明の作用効果を説明する。
本発明の中間ケース保護部材１４を持たない通常の配線用遮断器では、大電流遮断時に固定接点１１と可動接点１０との間で発生するアークはその近傍の絶縁材の表面に沿って流れようとする。しかし本発明の配線用遮断器は、固定接触子９とその近傍の中間ケース１との間の空間内に左右ケース２の内面より形成した中間ケース保護部材１４を中間ケース１から分離させて設けてあるので、中間ケース保護部材１４と中間ケース１とは直接接触していないので、固定接触子９と中間ケース１との間が中間ケース保護部材１４を介してアークが連続することもない。直接接触していると、中間ケース保護部材１４に沿って中間ケース１にアークが移動することにより中間ケース１の絶縁が劣化する問題があるので、中間ケース保護部材１４が固定接触子９及び中間ケース１と分離させて形成するものである。また、固定接触子９の側方には凹凸部１６を形成しているため、沿面距離が図７に示すように長くなる。 Next, the function and effect of the present invention will be described.
In a normal circuit breaker having no intermediate case protection member 14 according to the present invention, an arc generated between the fixed contact 11 and the movable contact 10 when a large current is interrupted will flow along the surface of the insulating material in the vicinity thereof. And However, the circuit breaker according to the present invention is provided with an intermediate case protection member 14 formed from the inner surfaces of the left and right cases 2 separated from the intermediate case 1 in the space between the stationary contact 9 and the intermediate case 1 in the vicinity thereof. Therefore, since the intermediate case protection member 14 and the intermediate case 1 are not in direct contact, the arc does not continue between the fixed contact 9 and the intermediate case 1 via the intermediate case protection member 14. If there is a direct contact, there is a problem that the insulation of the intermediate case 1 deteriorates due to the arc moving to the intermediate case 1 along the intermediate case protection member 14. It is formed separately from the case 1. Moreover, since the uneven part 16 is formed on the side of the fixed contact 9, the creeping distance becomes longer as shown in FIG.

さらに固定接触子９とその近傍の中間ケース１との間の空間距離も、それらの間に存在する中間ケース保護部材１４によって長くなる。このように中間ケース保護部材１４によって沿面距離とともに空間距離も長くなるので、絶縁物で囲まれた空間から排気孔の方向に移動するアークガスにより中間ケース１の表面の絶縁劣化を防止することができる。   Further, the spatial distance between the stationary contact 9 and the intermediate case 1 in the vicinity thereof is also increased by the intermediate case protection member 14 existing between them. Thus, since the intermediate case protection member 14 increases the creepage distance and the spatial distance, it is possible to prevent the deterioration of the insulation of the surface of the intermediate case 1 by the arc gas moving in the direction of the exhaust hole from the space surrounded by the insulator. .

上記したように、この実施形態では中間ケース保護部材１４を断面が略クランク状のものとしたが、可動接触子９の動きと干渉しない程度に垂直部などを形成し、空間距離をより長くすることも可能である。   As described above, in this embodiment, the intermediate case protection member 14 has a substantially crank-shaped cross section, but a vertical portion or the like is formed so as not to interfere with the movement of the movable contact 9 and the spatial distance is made longer. It is also possible.

さらにこの中間ケース保護部材１４は左右のケース２の内面に突設されたものであるため、中間ケース１に対して左右のケース２をビス３で組み付けるだけでよく、別部品を必要としないので、組み立てが簡単であるうえ、部品点数が増加することもなく、コストアップを抑制することができる。   Further, since the intermediate case protection member 14 is projected from the inner surfaces of the left and right cases 2, it is only necessary to assemble the left and right cases 2 with screws 3 with respect to the intermediate case 1, and no separate parts are required. In addition, the assembly is simple and the number of parts does not increase, and the cost increase can be suppressed.

以上に説明したように、本発明によれば、部品点数を増加させることなく、固定接点１１の周辺の中間ケース１をアークガスから保護して絶縁劣化を防止することができる。このため中間ケース１の絶縁性の劣化に伴うトラブルを、低コストで回避することができる利点がある。   As described above, according to the present invention, it is possible to protect the intermediate case 1 around the fixed contact 11 from arc gas and prevent insulation deterioration without increasing the number of parts. For this reason, there exists an advantage which can avoid the trouble accompanying the insulation deterioration of the intermediate case 1 at low cost.

１ 中間ケース
２ 左右のケース
３ ビス
４ バイメタル
５ トリガレバー
６ ハンドル
７ クロスバー
８ 可動接触子
９ 固定接触子
１０ 可動接点
１１ 固定接点
１２ プラグ部
１３ 中央隔壁
１４ 中間ケース保護部材
１５ 固定接点保持部
１６ 凹凸部 DESCRIPTION OF SYMBOLS 1 Intermediate case 2 Right and left case 3 Screw 4 Bimetal 5 Trigger lever 6 Handle 7 Crossbar 8 Movable contact 9 Fixed contact 10 Movable contact 11 Fixed contact 12 Plug part 13 Central partition 14 Intermediate case protection member 15 Fixed contact holding part 16 Uneven part

Claims (3)

固定接触子が取付固定された中間ケースと、この中間ケースを覆う左右のケースとを備えた配線用遮断器において、
固定接触子とその近傍の中間ケースとの間の空間内に、アークガスから中間ケースを保護する中間ケース保護部材を、中間ケースから分離させて設けたことを特徴とする配線用遮断器。 In a circuit breaker comprising an intermediate case with a fixed contact mounted and fixed, and left and right cases covering the intermediate case,
A circuit breaker for wiring, wherein an intermediate case protection member for protecting the intermediate case from arc gas is provided separately from the intermediate case in a space between the fixed contact and the adjacent intermediate case. 前記中間ケース保護部材が、左右のケースの内面に突設されたものであることを特徴とする請求項１記載の配線用遮断器。   2. The circuit breaker according to claim 1, wherein the intermediate case protection member is provided on the inner surfaces of the left and right cases. 固定接触子の先端を中間ケースより浮き上がらせて形成し、前記中間ケース保護部材が固定接触子の下側を覆う形状であることを特徴とする請求項２記載の配線用遮断器。   3. The circuit breaker according to claim 2, wherein a tip of the fixed contact is formed so as to float above the intermediate case, and the intermediate case protection member covers the lower side of the fixed contact.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102055140B1 (en) * 2018-08-29 2019-12-12 엘에스산전 주식회사 Molded Case Circuit Breaker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61113359U (en) * 1984-12-24 1986-07-17
JPH0883555A (en) * 1994-09-13 1996-03-26 Nitto Kogyo Kk Circuit breaker for wiring

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61113359U (en) * 1984-12-24 1986-07-17
JPH0883555A (en) * 1994-09-13 1996-03-26 Nitto Kogyo Kk Circuit breaker for wiring

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102055140B1 (en) * 2018-08-29 2019-12-12 엘에스산전 주식회사 Molded Case Circuit Breaker
CN110875164A (en) * 2018-08-29 2020-03-10 Ls产电株式会社 Circuit breaker for wiring
US11309155B2 (en) 2018-08-29 2022-04-19 Ls Electric Co., Ltd. Molded case circuit breaker

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