JPH0831296A - Circuit breaker - Google Patents
Circuit breakerInfo
- Publication number
- JPH0831296A JPH0831296A JP18542894A JP18542894A JPH0831296A JP H0831296 A JPH0831296 A JP H0831296A JP 18542894 A JP18542894 A JP 18542894A JP 18542894 A JP18542894 A JP 18542894A JP H0831296 A JPH0831296 A JP H0831296A
- Authority
- JP
- Japan
- Prior art keywords
- arc gas
- exhaust passage
- circuit breaker
- opening
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Breakers (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、配線用遮断器や漏電
遮断器などの回路遮断器に関し、特にそのアークガス排
出手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker such as a circuit breaker for wiring or an earth leakage breaker, and more particularly to an arc gas discharging means for the circuit breaker.
【0002】[0002]
【従来の技術】図3は上記回路遮断器の従来構成を示す
電源側半部の縦断面図である。図3において、ケース1
とカバー2とからなる絶縁容器内には、ケース1に固定
された固定接触子3と開閉機構4により開閉駆動される
可動接触子5とからなる遮断部が構成され、この遮断部
には消弧室6が設置されている。なお、図は中央極部分
の遮断部を示しているが、絶縁容器は相間隔壁により内
部が3相空間に区画され、各空間にそれぞれ各相遮断部
が収容されている。また、ケース1には固定接触子3に
近接して左右方向の隔壁1aが形成され、遮断部と開閉
機構部とを隔てている。固定接触子3は一端に電源側端
子3aが一体形成され、固定接点7が設けられた他端は
U字状に折り返されて可動接触子5に沿う平行導体部を
形成している。2. Description of the Related Art FIG. 3 is a vertical cross-sectional view of a power supply side half portion showing a conventional configuration of the circuit breaker. In FIG. 3, case 1
In the insulating container consisting of the cover 2 and the cover 2, there is formed a shutoff portion made up of the fixed contactor 3 fixed to the case 1 and the movable contactor 5 which is driven to be opened / closed by the opening / closing mechanism 4. The arc chamber 6 is installed. Although the figure shows the cutoff portion in the central pole portion, the interior of the insulating container is divided into three-phase spaces by the phase gap walls, and each phase cutoff portion is housed in each space. Further, a partition wall 1a in the left-right direction is formed in the case 1 in the vicinity of the fixed contactor 3 to separate the blocking portion and the opening / closing mechanism portion. The fixed contactor 3 has a power source side terminal 3a integrally formed at one end, and the other end provided with the fixed contact 7 is folded back in a U shape to form a parallel conductor portion along the movable contactor 5.
【0003】固定接点7と接離する可動接点8を有する
可動接触子5は絶縁物のホルダ9を介してケース1に回
動自在に支持され、ホルダ9と一体の開閉軸9aを支点
に開閉駆動される。消弧室6は左右一対の絶縁物の支持
板10に複数枚のグリッド11が適宜の間隔で上下に積
層支持された構造を持ち、グリッド11には可動接触子
5の開閉軌道を囲んでV字形の切欠が設けられている。
遮断部の前方にはアークガス排出口12が設けられ、こ
のアークガス排出口12には異物の侵入を防止する絶縁
物の防護板13が装着されている。このような回路遮断
器において、電流遮断時にアークガスの発生により遮断
部の内圧が上昇すると、この内圧上昇により防護板13
が外側に押されて図に鎖線で示したように湾曲し、これ
により開口したアークガス排出口12からアークガスが
矢印で示すように回路遮断器の電源側に向かって排出さ
れる。A movable contact 5 having a movable contact 8 which comes in contact with and separates from a fixed contact 7 is rotatably supported by a case 1 through an insulator holder 9 and is opened and closed with an opening / closing shaft 9a integral with the holder 9 as a fulcrum. Driven. The arc-extinguishing chamber 6 has a structure in which a plurality of grids 11 are vertically stacked and supported on a pair of left and right support plates 10 of an insulating material. A letter-shaped notch is provided.
An arc gas discharge port 12 is provided in front of the shutoff portion, and an insulating protective plate 13 for preventing foreign matter from entering is attached to the arc gas discharge port 12. In such a circuit breaker, when the internal pressure of the breaking portion rises due to the generation of arc gas when the current is cut off, the rise of the internal pressure causes the protective plate 13 to rise.
Is pushed outward and curved as shown by the chain line in the figure, whereby arc gas is discharged from the opened arc gas outlet 12 toward the power source side of the circuit breaker as shown by the arrow.
【0004】[0004]
【発明が解決しようとする課題】電流遮断時に発生する
アークガスは上述した通りアークガス排出口12から排
出されるのであるが、このアークガス排出孔12は図3
からも分かる通り固定接触子3の設置部分よりかなり高
い位置に開口しているため、固定接触子設置部分に拡散
したアークガスは従来からこの部分に滞留する傾向があ
った。アークガスは接点7,8を含む固定・可動接触子
3,5部分やグリッド11がアーク熱で溶融して生じた
金属溶融物を含んでいるが、アークガスが滞留するとこ
の金属溶融物がケース1の内表面に付着して絶縁耐力を
低下させる。そこで、この発明は、固定接触子設置部分
からのアークガスの排出を促進してアークガスの滞留に
よる絶縁耐力の低下を防止した回路遮断器を提供するこ
とを目的とするものである。The arc gas generated when the electric current is cut off is discharged from the arc gas discharge port 12 as described above. This arc gas discharge hole 12 is shown in FIG.
As can be seen from the above, since the opening is at a position considerably higher than the installation portion of the fixed contactor 3, the arc gas diffused to the installation portion of the fixed contactor has conventionally been apt to stay in this portion. The arc gas contains a metal melt produced by melting the fixed / movable contacts 3 and 5 including the contacts 7 and 8 and the grid 11 by arc heat. It adheres to the inner surface and reduces the dielectric strength. Then, this invention aims at providing the circuit breaker which promoted discharge | emission of the arc gas from the fixed contact installation part, and prevented the fall of the dielectric strength due to the retention of the arc gas.
【0005】[0005]
【課題を解決するための手段】この発明は、ケースに固
定された固定接触子と開閉機構により開閉駆動される可
動接触子とからなる遮断部の前方にアークガス排出口が
設けられた回路遮断器において、ケースと固定接触子と
の間に、アークガス排出口に通じる排気通路を形成する
ことにより、上記目的を達成するものとする。その場
合、排気通路のアークガス排出口と反対側の開口部に、
前記排気通路より小径の通気孔を有する絶縁物の遮蔽板
を設ければ、アークガス中の金属溶融物による排気通路
の詰まりを防止する上で有効である。また、上記遮蔽板
は遮断部と開閉機構との間に設けた隔壁に一体形成する
のがよい。SUMMARY OF THE INVENTION The present invention is a circuit breaker in which an arc gas discharge port is provided in front of a breaker portion which is composed of a fixed contactor fixed to a case and a movable contactor which is opened and closed by an opening / closing mechanism. In the above, the above object is achieved by forming an exhaust passage communicating with the arc gas discharge port between the case and the fixed contact. In that case, in the opening on the opposite side of the arc gas discharge port of the exhaust passage,
It is effective to prevent the exhaust passage from being clogged with the metal melt in the arc gas by providing an insulating shield plate having a vent hole having a diameter smaller than that of the exhaust passage. Further, it is preferable that the shielding plate is integrally formed with a partition wall provided between the blocking portion and the opening / closing mechanism.
【0006】[0006]
【作用】この発明においては、ケースと固定接触子との
間に、アークガス排出口に通じる排気通路を形成し、固
定接触子設置部分に拡散してきたアークガスをこの排気
通路を介して積極的に外部に排出する。これにより、固
定接触子設置部分でアークガスが滞留しなくなる。その
場合、排気通路のアークガス排出口と反対側の開口部、
つまり排気通路のアークガス入口側に、排気通路より小
径の通気孔を有する絶縁物の遮蔽板を設ければ、アーク
ガス中の金属溶融物の排気通路への侵入を遮蔽板で阻止
することができ、また通気孔を通して侵入するものがあ
っても排気通路より小径であるため、それが詰まって排
気通路が閉塞される恐れがない。遮蔽板は遮断部と開閉
機構との間に設ける隔壁に一体形成することができ、そ
れにより遮蔽板を別部品として設ける必要がなくなる。According to the present invention, the exhaust passage communicating with the arc gas discharge port is formed between the case and the fixed contact, and the arc gas diffused to the fixed contact installation portion is positively externalized through this exhaust passage. To discharge. As a result, the arc gas does not stay in the fixed contactor installation portion. In that case, the opening on the side opposite to the arc gas outlet of the exhaust passage,
That is, if an insulating material shield plate having a vent hole having a diameter smaller than that of the exhaust passage is provided on the arc gas inlet side of the exhaust passage, the shield plate can prevent the metal melt in the arc gas from entering the exhaust passage. Further, even if there is something that enters through the ventilation hole, it has a smaller diameter than the exhaust passage, so there is no possibility that it will be clogged and the exhaust passage will be blocked. The shield plate can be formed integrally with the partition wall provided between the shield portion and the opening / closing mechanism, thereby eliminating the need to provide the shield plate as a separate component.
【0007】[0007]
【実施例】以下、図1及び図2に基づいてこの発明の実
施例を説明する。ここで、図1は回路遮断器の電源側半
部の縦断面図、図2はその固定接触子部分の拡大斜視図
である。なお、従来例と対応する部分には同一の符号を
用い、特に同一構成部分については説明を省略する。ま
ず、図1において、ケース1の各相空間の内底面は固定
接触子3の下面に沿って全幅に渡って削除され、隔壁1
aからアークガス排出口12に達する排気通路14が設
けられている。そして、固定接触子3を支持するために
排気通路14の途中に円柱状のボス1bがケース1と一
体に突出形成され、このボス1bは固定接触子3の下面
に当接している。なお、ボス1bの両側では排気通路の
幅が広げられ、ボス1bによる通気の妨げが生じないよ
うになっている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a vertical sectional view of a power supply side half of the circuit breaker, and FIG. 2 is an enlarged perspective view of a fixed contact portion thereof. The same reference numerals are used for the parts corresponding to those of the conventional example, and the description of the same parts in particular is omitted. First, in FIG. 1, the inner bottom surface of each phase space of the case 1 is removed over the entire width along the lower surface of the fixed contactor 3, and the partition wall 1
An exhaust passage 14 is provided to reach the arc gas discharge port 12 from a. In order to support the fixed contact 3, a cylindrical boss 1b is integrally formed with the case 1 so as to project in the middle of the exhaust passage 14, and the boss 1b is in contact with the lower surface of the fixed contact 3. The width of the exhaust passage is widened on both sides of the boss 1b so that the boss 1b does not hinder ventilation.
【0008】また、遮断部と開閉機構4との間には、樹
脂成形品の隔壁15が設けられている。隔壁15は図2
に示すように、直立した隔壁本体15aとその基部に形
成された袋状のカバー部15bとからなり、カバー部1
5bを介して固定接触子3のU字状部に被着されてい
る。隔壁本体15aにはスリット16が形成され、可動
接触子5はこのスリット16内で開閉動作をする。この
隔壁15は開閉機構4の設置空間へのアークガスの拡散
・侵入を阻止し、すでに述べたアークガス中の金属溶融
物が開閉機構3に付着してその動作が妨げられることを
防止するために設置されたものであるが、いまの場合、
隔壁15には遮蔽板17が一体形成され、かつこの遮蔽
板17には排気通路14より小径の左右2個の長方形の
通気孔18が設けられている。遮蔽板17はカバー部1
5bの後端上部から隔壁1a側に水平に延び出し、図1
に示すように排気通路14のアークガス排出口12と反
対側の開口部14aに隙間19を介して被さっている。
その他の構成は従来例と同じである。Further, a partition wall 15 of a resin molded product is provided between the shutoff portion and the opening / closing mechanism 4. The partition wall 15 is shown in FIG.
As shown in FIG. 1, it comprises an upright partition wall body 15a and a bag-shaped cover portion 15b formed on the base portion thereof.
It is attached to the U-shaped portion of the fixed contactor 3 via 5b. A slit 16 is formed in the partition wall body 15 a, and the movable contact 5 is opened and closed in the slit 16. This partition wall 15 is installed in order to prevent the arc gas from diffusing and entering the installation space of the opening / closing mechanism 4 and preventing the metal melt in the arc gas described above from adhering to the opening / closing mechanism 3 and hindering its operation. In the present case,
A shield plate 17 is integrally formed on the partition wall 15, and two left and right rectangular ventilation holes 18 having a smaller diameter than the exhaust passage 14 are provided in the shield plate 17. The shielding plate 17 is the cover 1
5b extends horizontally from the upper part of the rear end of 5b to the partition wall 1a side.
As shown in FIG. 3, the opening 14 a of the exhaust passage 14 on the opposite side of the arc gas discharge port 12 is covered via a gap 19.
Other configurations are the same as the conventional example.
【0009】このような回路遮断器において、電流遮断
時にアークガスが発生し遮断部の内圧が上昇すると、こ
のアークガスはすでに述べたように防護板13を押し開
いてアークガス排出口12から外部に排出されるが、ア
ークガスはまたその圧力により絶縁容器内で四方八方に
拡散しようとする。そのうち、固定接触子3の設置部分
に下降したアークガスは矢印で示すように固定接触子3
の側方から回り込んで排気通路14に集められ、圧力の
低いアークガス排出口12方向に導かれてここから外部
に排出される。開閉機構4方向に向かうアークガスは大
部分は隔壁15により阻止されるが、スリット16(図
2)などからその裏側に侵入したアークガスは矢印で示
すように遮蔽板17の通気孔18や隙間19などを介し
て排気通路14内に回収される。In such a circuit breaker, when an arc gas is generated when the current is interrupted and the internal pressure of the interrupting part rises, this arc gas pushes the protective plate 13 open as described above and is discharged from the arc gas discharge port 12 to the outside. However, the arc gas also tries to spread in all directions in the insulating container due to the pressure. Among them, the arc gas descending to the installation portion of the fixed contactor 3 is fixed as shown by the arrow.
Is collected in the exhaust passage 14, is guided to the arc gas discharge port 12 having a low pressure, and is discharged to the outside. Most of the arc gas directed toward the opening / closing mechanism 4 is blocked by the partition wall 15, but the arc gas that enters the back side from the slit 16 (FIG. 2) or the like is shown by arrows, such as the vent hole 18 and the gap 19 of the shield plate 17. It is collected in the exhaust passage 14 via the.
【0010】その際、上向きに開放した開口部14aは
そのままではアークガス中の金属溶融物が溜まりやすい
が、図示構成では遮蔽板17があるのでここで阻止さ
れ、排気通路14が金属溶融物で詰まることがない。ま
た、金属溶融物には通気孔18を通して侵入するものも
あるが、通気孔18は排気通路14よりも小径であるた
め、通気孔18を通過した金属溶融物では排気通路14
は詰まらない。At this time, the metal melt in the arc gas is likely to accumulate if the opening 14a opened upward is left as it is, but it is blocked by the shield plate 17 in the illustrated structure, and the exhaust passage 14 is clogged with the metal melt. Never. Although some of the metal melt penetrates through the vent hole 18, since the vent hole 18 has a smaller diameter than the exhaust passage 14, the metal melt that has passed through the vent hole 18 has an exhaust passage 14.
Does not get stuck.
【0011】[0011]
【発明の効果】この発明によれば、ケースと固定接触子
との間に、アークガス排出口に通じる排気通路を形成す
ることにより、アークガスが滞留しやすかった固定接触
子設置部分の排気が良好となり、アークガス中の金属溶
融物のケースへの付着による絶縁耐力の低下が防がれ
る。また、その場合、排気通路のアークガス排出口と反
対側の開口部に、排気通路より小径の通気孔を有する絶
縁物の遮蔽板を設ければ、アークガス中の金属溶融物に
よる排気通路の詰まりを防止する上で有効であり、また
遮蔽板を遮断部と開閉機構との間に設けた隔壁に一体形
成すれば部品点数を増やすことなく所望の構成とするこ
とができる。According to the present invention, the exhaust passage communicating with the arc gas discharge port is formed between the case and the fixed contact, so that the exhaust of the fixed contact installation portion where the arc gas is likely to stay becomes good. It is possible to prevent the dielectric strength from being lowered due to the adhesion of the metal melt in the arc gas to the case. Further, in that case, if a shield plate of an insulator having a vent hole having a diameter smaller than that of the exhaust passage is provided at the opening of the exhaust passage on the side opposite to the arc gas outlet, clogging of the exhaust passage due to the metal melt in the arc gas is provided. It is effective in preventing it, and if the shielding plate is integrally formed with the partition wall provided between the blocking portion and the opening / closing mechanism, the desired configuration can be achieved without increasing the number of parts.
【図1】この発明の実施例を示す回路遮断器の要部縦断
面図である。FIG. 1 is a longitudinal sectional view of an essential part of a circuit breaker showing an embodiment of the present invention.
【図2】図1における固定接触子部分の斜視図である。FIG. 2 is a perspective view of a fixed contactor portion in FIG.
【図3】従来例を示す回路遮断器の要部縦断面図であ
る。FIG. 3 is a longitudinal sectional view of a main part of a circuit breaker showing a conventional example.
1 ケース 2 カバー 3 固定接触子 4 開閉機構 5 可動接触子 6 消弧室 12 アークガス排出口 13 防護板 14 排気通路 15 隔壁 17 遮蔽板 18 通気孔 1 Case 2 Cover 3 Fixed Contact 4 Opening / Closing Mechanism 5 Movable Contact 6 Arc-Extinguishing Chamber 12 Arc Gas Discharge Port 13 Protective Plate 14 Exhaust Passage 15 Partition Wall 17 Shielding Plate 18 Vent
Claims (3)
により開閉駆動される可動接触子とからなる遮断部の前
方にアークガス排出口が設けられた回路遮断器におい
て、 ケースと固定接触子との間に、アークガス排出口に通じ
る排気通路を形成したことを特徴とする回路遮断器。1. A circuit breaker in which an arc gas discharge port is provided in front of a breaker composed of a fixed contact fixed to a case and a movable contact driven to open / close by an opening / closing mechanism, wherein the case and the fixed contact are provided. A circuit breaker characterized in that an exhaust passage communicating with the arc gas discharge port is formed between the two.
口部に、前記排気通路より小径の通気孔を有する絶縁物
の遮蔽板を設けたことを特徴とする請求項1記載の回路
遮断器。2. The circuit breaker according to claim 1, wherein an insulating shielding plate having a vent hole having a diameter smaller than that of the exhaust passage is provided at an opening of the exhaust passage opposite to the arc gas discharge port. .
隔壁に一体形成したことを特徴とする請求項2記載の回
路遮断器。3. The circuit breaker according to claim 2, wherein the shielding plate is integrally formed with a partition wall provided between the breaking portion and the opening / closing mechanism.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18542894A JPH0831296A (en) | 1994-07-14 | 1994-07-14 | Circuit breaker |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18542894A JPH0831296A (en) | 1994-07-14 | 1994-07-14 | Circuit breaker |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0831296A true JPH0831296A (en) | 1996-02-02 |
Family
ID=16170618
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18542894A Pending JPH0831296A (en) | 1994-07-14 | 1994-07-14 | Circuit breaker |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0831296A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003065396A1 (en) * | 2002-01-31 | 2003-08-07 | Mitsubishi Denki Kabushiki Kaisha | Air circuit breaker |
CN1333419C (en) * | 2003-11-26 | 2007-08-22 | Lg产电株式会社 | Circuit breaker |
CN102810437A (en) * | 2011-06-02 | 2012-12-05 | Ls产电株式会社 | Arc extinguishing device for circuit breaker |
-
1994
- 1994-07-14 JP JP18542894A patent/JPH0831296A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003065396A1 (en) * | 2002-01-31 | 2003-08-07 | Mitsubishi Denki Kabushiki Kaisha | Air circuit breaker |
CN1333419C (en) * | 2003-11-26 | 2007-08-22 | Lg产电株式会社 | Circuit breaker |
CN102810437A (en) * | 2011-06-02 | 2012-12-05 | Ls产电株式会社 | Arc extinguishing device for circuit breaker |
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