JP3551263B2 - Safety device - Google Patents

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Publication number
JP3551263B2
JP3551263B2 JP28547293A JP28547293A JP3551263B2 JP 3551263 B2 JP3551263 B2 JP 3551263B2 JP 28547293 A JP28547293 A JP 28547293A JP 28547293 A JP28547293 A JP 28547293A JP 3551263 B2 JP3551263 B2 JP 3551263B2
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pressure
safety device
receiving blade
release plate
cylindrical body
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JPH07111222A (en
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松次郎 松見
浩堯 城田
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Shizuki Electric Co Inc
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Shizuki Electric Co Inc
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Description

【０００１】
【産業上の利用分野】
この発明はガス封入式コンデンサ等の密閉した容器の内部圧力が異常に上昇したときに作動する安全装置に関するものである。
【０００２】
【従来の技術】
従来、密閉した容器に格納されたガス封入式コンデンサが使用中に絶縁破壊を起こした場合、電源が遮断されるように保護装置が設けられている。しかしこの保護装置が働かず、電源が遮断されなかった場合は、絶縁破壊により容器の内部でガスが発生して内部圧力が上昇し、最悪の場合にはコンデンサ容器の破壊に至ることがある。これを防止するため安全装置が用いられたが、その安全装置は図１１や図１３に示すような構造をしていた。
【０００３】
すなわち従来のものは、図１１に示すように、ガス封入されたコンデンサの密閉容器３１の底面の孔３２の周囲に、円筒形の金具３３を密閉容器３１の外部から取付け、この金具３３の中空部分に放圧板３５を、放圧板押用金具３４により取付けた構造であった。そして放圧板３５の表面には、図１２に示すように、中心から放射状に数条の掻傷をつけて弱点部３６とし、密閉容器３１の内部圧力が高くなるとこの圧力により放圧板３５が弱点部３６から破損し、その破損部分からガスを放出して内部圧力を下げるようにしていた。
【０００４】
また他の従来のガス封入式コンデンサの安全装置は、図１３に示すように、金属製の密閉容器４１の外部に半球状の可撓性を有する放圧板４５を、その凸部分が密閉容器４１の底面の孔４２を閉塞するように配置し、先鋭金具４６を、その先鋭部分が放圧板４５の凹部分に対向するように配置すると共に、それらの放圧板４５と先鋭金具４６とを、金具４３、放圧板押用金具４４、先鋭金具取付板４７及びネジ４８、４８で相互に固定した構造であった。そしてこの構造において、密閉容器４１の内部圧力が高くなると、放圧板４５が、図１３の点線で示すように反転し、先鋭金具４６に突き当たって破損し、その破損部分からガスを放出して内部圧力を下げるようにしていた。
【０００５】
【発明が解決しようとする課題】
しかし前者の例において、放圧板が平面のため破損に至る動作圧力にバラツキが生じ、このバラツキを小さくすることは困難であり、安定した動作を得ることができなかった。また安全装置の動作圧力はできるだけ低い方が安全装置の取付けを必要とする機器等の安全性を図る上で望ましいが、この従来例における放圧板の形状ではあまり低くすることはできなかった。
【０００６】
また後者の例においては上記欠点は防止し得るものの、放圧板が反転して先鋭金具に突き当たって破損した際、先鋭金具４６による穿孔を、先鋭金具４６そのものが閉鎖する構造であることから、放圧板４５の破損による放圧板４５の開口面積が小さく、大量のガスを短時間で放出することが困難であった。
【０００７】
この発明は上記従来の欠点を解決するためになされたものであって、その目的は、動作圧力が低くても安定に作動し、かつ短時間内に内部圧力を低下させることが可能な安全装置を提供することにある。
【０００８】
【課題を解決するための手段】
そこで請求項１の安全装置は、密閉容器に設けた導通孔の周囲に筒状体を取付ける一方、上記筒状体の内周部には、球状部分を有する可撓性の放圧板を、その凸面が上記導通孔に面するよう取付けて筒状体の内外を区画し、さらに上記放圧板よりも外方の位置には、上記密閉容器の内圧上昇による上記放圧板の凹凸反転動作時に、上記放圧板を破損させるため受刃を配置した安全装置において、上記受刃は、上記放圧板の破損時の亀裂進行方向に交差するように曲成したＳ字形の刃部分を有することを特徴としている。
【０００９】
また請求項２の安全装置は、上記筒状体の内周部には、一対の段部が周設され、一方の段部には放圧板が、他方の段部には受刃がそれぞれ嵌入されていることを特徴としている。
【００１０】
さらに請求項３の安全装置は、上記受刃の両端部には摺接部が形成され、上記受刃は段部に、上記摺接部を段部周壁面に弾性的に押圧、接触させた状態で嵌入されていることを特徴としている。
【００１１】
請求項４の安全装置は、上記密閉容器には、コンデンサ素子等の電気機器を収納していることを特徴としている。
【００１２】
【作用】
請求項１の安全装置においては、密閉容器の内部圧力が一定レベルに達すると、導通孔を介してこの圧力が放圧板に伝わり、放圧板の反転が生じて受刃による放圧板の破損が開始される。そして受刃が、亀裂進行方向に交差するように曲成したＳ字形の刃部分を有するので、放圧板の反転で生じた亀裂が曲げ部分を形成したＳ字形の刃部分によって引裂かれ、亀裂を広げることになる。このように破損による放圧板の開口面積が大きくなるため大量のガスを短時間で排出可能となり、内部圧力を短時間で低下させることができる。
【００１３】
また請求項２の安全装置によれば、放圧板と受刃とを同一の筒状体の内側に設けられた段部に嵌入するのみで、微妙な位置調整を要することなく放圧板と受刃との正確な取付けができる。
【００１４】
さらに請求項３の安全装置によれば、受刃の弾性を利用して受刃の固定ができるので、安全装置の組立てが容易となる。
【００１５】
【実施例】
次にこの発明の安全装置の具体的な実施例について、図面を参照しつつ詳細に説明する。図１はこの発明の実施例による安全装置の分解斜視図、図２は同実施例の断面図、図３は同実施例に使用される受刃の平面図、図４は同受刃の正面図、図５はこの実施例による安全装置の取付けられたガス封入式コンデンサの正面図である。
【００１６】
図５において、１は密閉容器、１４はコンデンサ素子、１５はコンデンサに封入された絶縁ガス、１６は外部引出端子、１７は取付脚、１８はこの実施例による安全装置である。
【００１７】
次に上記安全装置１８の細部について説明する。図１、図２において、安全装置１８は、コンデンサ素子の収納された密閉容器１の一部に穿設された導通孔２と、この密閉容器１に取付けられる筒状体３と、この筒状体３の内部に取付けられる放圧板４と、受刃５とから構成される。
【００１８】
これらの放圧板４、受刃５及び筒状体３は次のような形状を有している。まず放圧板４は球状部分を有する可撓金属製のもので、その周囲につば部７を有する。受刃５は金属板を成形したもので、図３及び図４に示すように、三角形状の板の頂点を挟む２辺を鋭利な刃部分１２、１２とし、これを底辺に沿ってＳ字形に湾曲させている。そのためこの受刃５は上から見るとＳ字形（図３）で、側面から見ると三角形状（図４）をしている。また筒状体３は一体成形された開口部を有する円筒状のもので、開口部の外周につば部１１を有する。また筒状体３の内部には、開口部から底面に向かって同心円状で、底面に向かうごとに直径が小さくなる階段状の上段部８、中段部９、下段部１０を設けてある。
【００１９】
そしてこれらの放圧板４、受刃５及び筒状体３は次のように組立てられる。まず筒状体３の下段部１０には、受刃５を、その刃部分１２、１２が上に向くように嵌入し、受刃５の有する弾性により受刃５のＳ字形の両端部分５ａ、５ａを下段部１０の側面に圧接して固定する。また図２のように、下段部１０の上端部１０ａはわずかに内側に張り出しているので、下段部１０に嵌入された受刃５ははずれにくくなる。筒状体３の上段部８には、放圧板４を、その凸面が筒状体３の上側開口部に面するように嵌入し、放圧板のつば部７を上段部８の底面に密着させ、ハンダ付等により固定する。これにより筒状体３の内部空間は、放圧板４の凸面に接する空間と凹面に接する空間の２つに気密性を保って仕切られることになる。なお中段部９は、放圧板４が図２の点線で示すように、反転に必要な空間を確保するために設けられている。
【００２０】
なお上記筒状体３は、筒状体３の上側開口部が密閉容器１の導通孔２を覆うようにして、そのつば部１１を密閉容器１の外面に密着させ溶接して固定されている。
【００２１】
上記により構成された安全装置を有するガス封入式コンデンサにおいては、使用中に絶縁破壊が生じたにも拘らず、保護装置が働かず、電源が遮断されない場合には、絶縁破壊によるガスが密閉容器１内に発生して内部圧力が上昇する。この上昇した内部圧力は、導通孔２を介して放圧板４に伝わり、放圧板４が図２の点線で示すように反転して受刃５に突き当たり、放圧板４が破損される結果、その破損部分からガスを放出し、そのガスを筒状体３の下部排出孔６を介して外部に排出することによって密閉容器１内の内部圧力が低下する。
【００２２】
この場合の安全装置の動作を詳しく説明すると、密閉容器１の内部圧力が一定レベルに達した時点で、放圧板４の反転が開始され、この放圧板４の反転の開始により受刃５の刃部分１２の頂点が放圧板４を突き破ることになり、放圧板４の破損が開始される。そして受刃５の形状が、前述の通り側面から見ると三角形状（図４）で上から見るとＳ字形（図３）であることから、受刃５の刃部分１２の頂点が放圧板４を突き破った時点で生じた亀裂が、放圧板４の反転の進行と共にＳ字形に引裂かれるので、亀裂が広げられることになる。つまり受刃の形状が単なる針状や平板状の場合は、放圧板を突き破った後に受刃自身がこの突き破った亀裂を塞ぐことになるのと比べて、受刃５による放圧板４の破損により生じた亀裂の開口面積が大きくなる。そのため大量のガスを短時間に放出可能で密閉容器１の内部圧力を短時間で低下させることができる。
【００２３】
またこの実施例においては、放圧板４には図１２に示す従来例の放圧板３５にあるような掻傷をつけた弱点部３６はなく、このような弱点部３６の有するわずかの掻傷の深さの違いが動作圧力の違いに結びつくといったことは生じない。またこの実施例における放圧板４と受刃５とが取付けられる筒状体３は、前述のように一体成形され、放圧板４と受刃５とは筒状体３の内部の溝に嵌入するだけでよいので、図１３に示す従来例と比べて放圧板４と受刃５の位置決め誤差を小さくすることができ、動作圧力の安定化が図れる。このことは放圧板４の大きさと原寸を変えることによって動作圧力の異なる安全装置を多種類製作する際に、動作圧力を低圧力から高圧力まで細分化して設定することを可能にする。
【００２４】
上記の実施例に基づき、具体的に試作を行った結果を図６に示す。この試作に用いられた放圧板４は銅製で、直径４０ｍｍ、厚さ０．１５ｍｍである。図６から、動作圧力は３ｋｇｆ／ｃｍ２±０．３ｋｇｆ／ｃｍ２であり、動作圧力が安定していることがわかる。
【００２５】
上記の実施例における受刃５を正面から見ると図４に示すように三角形状をしているが、これに限定されるものではない。
【００２６】
図７〜図１０にこの実施例による安全装置を油入コンデンサに取付けた実施例を示す。図７〜図１０において、２１は密閉容器、２２は外部引出端子、２３は上記同様の安全装置である。油入コンデンサにおいては、コンデンサが絶縁破壊を起こした場合、ガス封入式コンデンサと同様、電源が遮断されるようになっているが、電源が遮断されない場合は、絶縁破壊により生じるガスで内部圧力が上昇し、最悪の場合、コンデンサ容器が破壊し、噴油による火災などの大事故に発展する可能性がある。これを防止するため安全装置を取付けるが、この安全装置をコンデンサの底面に取付けると、安全装置が作動した際、コンデンサ内の油がコンデンサが設置されている床面等に流れ落ち、二次的被害が生じる原因となる。そのためこの発明による安全装置を油入コンデンサに取付ける場合に、安全装置が動作時、油が安全装置の排出孔から流れ落ちないようにするため、安全装置は、図７〜図１０に示すように、コンデンサの設置時に上になる位置に取付けるのが好ましい。
【００２７】
なお上記の実施例においては、ガス封入又は油入コンデンサに安全装置を取付けているが、これに限定されるものではなく、内部圧力上昇の危険性のある密閉容器を用いる他の電気機器に対しても、また同様の電気機器以外のものに対しても取付け可能である。
【００２８】
【発明の効果】
以上のように請求項１の安全装置においては、受刃の形状がもたらす放圧板破損の効力が大きいため、内部圧力が短時間で低下することから、安全装置の性能向上に貢献できる。
【００２９】
また請求項２の安全装置によれば、放圧板と受刃とを同一の筒状体の内側に設けられた段部に嵌入するのみで、微妙な位置調整を要することなく放圧板と受刃との正確な取付けができるので、組立作業の容易化、及び動作の安定化が図れる。
【００３０】
さらに請求項３の安全装置によれば、受刃の弾性を利用して受刃の固定ができるので、安全装置の組立てが容易となる。
【図面の簡単な説明】
【図１】この発明の実施例における安全装置の分解斜視図である。
【図２】同実施例の断面図である。
【図３】同実施例に使用の受刃の平面図である。
【図４】同受刃の正面図である。
【図５】この発明の実施例におけるガス封入式コンデンサの正面図である。
【図６】同実施例による試作結果を表したグラフである。
【図７】この発明の他の実施例における油入式コンデンサの外観図である。
【図８】この発明の他の実施例における油入式コンデンサの外観図である。
【図９】この発明の他の実施例における油入式コンデンサの外観図である。
【図１０】この発明の他の実施例における油入式コンデンサの外観図である。
【図１１】従来例の安全装置の断面図である。
【図１２】同従来例に使用の放圧板の上面図である。
【図１３】他の従来例の安全装置の断面図である。
【符号の説明】
１ 密閉容器
２ 導通孔
３ 筒状体
４ 放圧板
５ 受刃
６ 排出孔
７ 放圧板のつば部
８ 上段部
１０ 下段部
１２ 刃部分
１３ 底辺[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device that operates when the internal pressure of a sealed container such as a gas-filled condenser rises abnormally.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a protection device is provided so as to shut off a power supply when a gas-filled capacitor stored in a closed container breaks down during use. However, if the protection device does not work and the power supply is not cut off, gas is generated inside the container due to dielectric breakdown and the internal pressure increases, and in the worst case, the capacitor container may be destroyed. To prevent this, a safety device was used, but the safety device had a structure as shown in FIGS.
[0003]
That is, as shown in FIG. 11, a cylindrical fitting 33 is attached from the outside of the closed vessel 31 around the hole 32 on the bottom face of the sealed vessel 31 of the gas-filled condenser. The pressure release plate 35 was attached to the part by the pressure release plate pressing bracket 34. Then, as shown in FIG. 12, the surface of the pressure release plate 35 is scratched radially from the center to form a weak portion 36. When the internal pressure of the closed container 31 increases, the pressure release plate 35 The portion 36 was broken, and gas was released from the broken portion to reduce the internal pressure.
[0004]
As another conventional safety device for a gas-filled capacitor, as shown in FIG. 13, a hemispherical flexible pressure-releasing plate 45 is provided outside a metal sealed container 41, and a convex portion thereof has a closed container 41. Is arranged so as to close the hole 42 on the bottom surface of the pressure-release plate 45, and the sharpened metal fitting 46 is arranged so that the sharpened portion thereof faces the concave portion of the pressure-releasing plate 45. 43, a pressure release plate pressing metal fitting 44, a sharp metal fitting mounting plate 47, and screws 48, 48. In this structure, when the internal pressure of the sealed container 41 is increased, the pressure release plate 45 is inverted as shown by the dotted line in FIG. 13, hits the sharp metal fitting 46 and breaks, and discharges gas from the damaged portion to release the internal gas. I was trying to lower the pressure.
[0005]
[Problems to be solved by the invention]
However, in the former example, since the pressure release plate is flat, the operating pressure that causes breakage is varied, and it is difficult to reduce the variation, and a stable operation cannot be obtained. It is desirable that the operating pressure of the safety device be as low as possible in order to ensure the safety of equipment that requires the attachment of the safety device. However, the shape of the pressure relief plate in this conventional example cannot be reduced so much.
[0006]
Further, in the latter example, although the above-mentioned disadvantage can be prevented, when the pressure release plate is inverted and hits the sharp metal fittings and breaks, the drilling by the sharp metal fittings 46 itself is closed. The opening area of the pressure release plate 45 due to the damage of the pressure plate 45 was small, and it was difficult to discharge a large amount of gas in a short time.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a safety device capable of operating stably even at a low operating pressure and capable of reducing the internal pressure within a short time. Is to provide.
[0008]
[Means for Solving the Problems]
Therefore, the safety device according to claim 1 attaches a cylindrical body around the conduction hole provided in the closed container, and on the inner peripheral portion of the cylindrical body, a flexible pressure relief plate having a spherical portion is provided. The convex surface is attached so as to face the conduction hole to partition the inside and outside of the cylindrical body, and further, at a position outside the pressure release plate, the concave / convex inversion operation of the pressure release plate due to an increase in the internal pressure of the closed vessel is performed. A safety device in which a receiving blade is arranged to damage a pressure relief plate, wherein the receiving blade has an S-shaped blade portion curved so as to intersect with a crack traveling direction when the pressure relief plate is damaged. .
[0009]
Further, in the safety device according to the second aspect, a pair of steps are provided around the inner periphery of the cylindrical body, and a pressure relief plate is fitted into one of the steps and a receiving blade is fitted into the other step. It is characterized by being.
[0010]
Further, in the safety device according to the third aspect, sliding contact portions are formed at both ends of the receiving blade, and the receiving blade elastically presses and contacts the step contact portion with the peripheral wall surface of the step portion. It is characterized by being fitted in a state.
[0011]
The safety device according to claim 4 is characterized in that electric equipment such as a capacitor element is housed in the closed container.
[0012]
[Action]
In the safety device according to the first aspect, when the internal pressure of the sealed container reaches a certain level, the pressure is transmitted to the pressure relief plate via the conduction hole, the pressure relief plate is inverted, and the pressure relief plate is damaged by the receiving blade. Is done. And, since the receiving blade has an S-shaped blade portion bent so as to intersect with the crack traveling direction, a crack generated by inversion of the pressure relief plate is torn by the S-shaped blade portion forming the bent portion, and the crack is formed. Will spread. As described above, since the opening area of the pressure release plate due to breakage increases, a large amount of gas can be discharged in a short time, and the internal pressure can be reduced in a short time.
[0013]
According to the safety device of the second aspect, the pressure release plate and the receiving blade are merely fitted into the step provided inside the same cylindrical body, and no fine adjustment of the position is required. Accurate installation with
[0014]
Furthermore, according to the safety device of the third aspect, the receiving blade can be fixed by utilizing the elasticity of the receiving blade, so that the safety device can be easily assembled.
[0015]
【Example】
Next, a specific embodiment of the safety device of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a safety device according to an embodiment of the present invention, FIG. 2 is a sectional view of the embodiment, FIG. 3 is a plan view of a receiving blade used in the embodiment, and FIG. FIG. 5 and FIG. 5 are front views of a gas-filled condenser equipped with a safety device according to this embodiment.
[0016]
In FIG. 5, 1 is a sealed container, 14 is a capacitor element, 15 is an insulating gas sealed in a capacitor, 16 is an external lead-out terminal, 17 is a mounting leg, and 18 is a safety device according to this embodiment.
[0017]
Next, details of the safety device 18 will be described. In FIGS. 1 and 2, a safety device 18 includes a conduction hole 2 formed in a part of a sealed container 1 in which a capacitor element is stored, a tubular body 3 attached to the sealed container 1, It comprises a pressure release plate 4 attached inside the body 3 and a receiving blade 5.
[0018]
The pressure release plate 4, the receiving blade 5, and the cylindrical body 3 have the following shapes. First, the pressure relief plate 4 is made of a flexible metal having a spherical portion, and has a collar portion 7 around the periphery thereof. The receiving blade 5 is formed by molding a metal plate. As shown in FIGS. 3 and 4, two sides sandwiching the apex of the triangular plate are formed as sharp blade portions 12, 12, and this is formed into an S-shape along the base. It is curved. Therefore, the receiving blade 5 has an S-shape (FIG. 3) when viewed from above and a triangular shape (FIG. 4) when viewed from the side. The cylindrical body 3 is a cylindrical body having an integrally formed opening, and has a flange 11 on the outer periphery of the opening. Further, inside the cylindrical body 3, there are provided a stepped upper section 8, a middle section 9, and a lower section 10 which are concentric from the opening to the bottom and whose diameter decreases toward the bottom.
[0019]
The pressure release plate 4, the receiving blade 5, and the cylindrical body 3 are assembled as follows. First, the receiving blade 5 is fitted into the lower step portion 10 of the tubular body 3 so that the blade portions 12, 12 thereof face upward. Due to the elasticity of the receiving blade 5, the S-shaped both end portions 5a of the receiving blade 5 are provided. 5a is pressed into contact with the side surface of the lower portion 10 and fixed. Further, as shown in FIG. 2, since the upper end portion 10a of the lower step portion 10 slightly protrudes inward, the receiving blade 5 fitted in the lower step portion 10 does not easily come off. The pressure release plate 4 is fitted into the upper portion 8 of the cylindrical body 3 so that the convex surface thereof faces the upper opening of the cylindrical body 3, and the flange 7 of the pressure release plate is brought into close contact with the bottom surface of the upper portion 8. And fixed by soldering. As a result, the internal space of the cylindrical body 3 is partitioned into a space in contact with the convex surface of the pressure release plate 4 and a space in contact with the concave surface with airtightness. The middle section 9 is provided to secure a space required for the pressure release plate 4 to be inverted as shown by a dotted line in FIG.
[0020]
The tubular body 3 is fixed by welding so that the upper opening of the tubular body 3 covers the conduction hole 2 of the closed casing 1, and the flange 11 is brought into close contact with the outer surface of the closed casing 1. .
[0021]
In a gas-filled capacitor having a safety device configured as described above, despite the occurrence of dielectric breakdown during use, if the protection device does not work and the power supply is not shut off, the gas due to the dielectric breakdown is a sealed container. 1 and the internal pressure rises. This increased internal pressure is transmitted to the pressure relief plate 4 via the conduction hole 2, and the pressure relief plate 4 is reversed as shown by the dotted line in FIG. By releasing gas from the damaged portion and discharging the gas to the outside through the lower discharge hole 6 of the tubular body 3, the internal pressure in the closed container 1 is reduced.
[0022]
The operation of the safety device in this case will be described in detail. When the internal pressure of the airtight container 1 reaches a certain level, the reversing of the pressure relief plate 4 is started. The apex of the portion 12 breaks through the pressure relief plate 4, and the pressure relief plate 4 starts to be damaged. As described above, the shape of the receiving blade 5 is triangular (FIG. 4) when viewed from the side and S-shaped (FIG. 3) when viewed from above. Is cracked at the point of breaking through, and is torn in an S-shape with the reversal of the pressure release plate 4, so that the crack is spread. In other words, when the shape of the receiving blade is a mere needle or a flat plate, the receiving blade itself closes the pierced crack after piercing the pressure releasing plate. The opening area of the generated crack increases. Therefore, a large amount of gas can be released in a short time, and the internal pressure of the sealed container 1 can be reduced in a short time.
[0023]
Further, in this embodiment, the pressure-release plate 4 does not have the weak portion 36 with the scratch as in the conventional pressure-release plate 35 shown in FIG. It does not occur that a difference in depth leads to a difference in operating pressure. Further, the cylindrical body 3 to which the pressure release plate 4 and the receiving blade 5 in this embodiment are attached is integrally formed as described above, and the pressure release plate 4 and the receiving blade 5 are fitted into grooves inside the cylindrical body 3. 13, the positioning error between the pressure release plate 4 and the receiving blade 5 can be reduced as compared with the conventional example shown in FIG. 13, and the operating pressure can be stabilized. This makes it possible to subdivide and set the operating pressure from a low pressure to a high pressure when manufacturing various types of safety devices having different operating pressures by changing the size and the original size of the pressure relief plate 4.
[0024]
FIG. 6 shows the results of specific trial production based on the above embodiment. The pressure relief plate 4 used in this prototype is made of copper, has a diameter of 40 mm and a thickness of 0.15 mm. From Figure 6, the operating pressure is 3kgf / cm 2 ± 0.3kgf / cm 2, it can be seen that the operating pressure is stable.
[0025]
When the receiving blade 5 in the above embodiment is viewed from the front, it has a triangular shape as shown in FIG. 4, but is not limited to this.
[0026]
7 to 10 show an embodiment in which the safety device according to this embodiment is attached to an oil-filled condenser. 7 to 10, reference numeral 21 denotes a closed container, 22 denotes an external lead-out terminal, and 23 denotes a safety device similar to the above. In the case of oil-filled capacitors, if the capacitor breaks down, the power is cut off in the same way as a gas-filled capacitor.However, if the power is not cut off, the internal pressure is reduced by the gas generated by the breakdown. In the worst case, the capacitor container may be destroyed, leading to a major accident such as a fire caused by oil spill. To prevent this, a safety device is installed, but if this safety device is installed on the bottom of the capacitor, the oil in the capacitor will flow down to the floor where the capacitor is installed when the safety device is activated, causing secondary damage May cause. Therefore, when the safety device according to the present invention is mounted on the oil-filled capacitor, in order to prevent oil from flowing down from the discharge hole of the safety device when the safety device operates, as shown in FIGS. It is preferable to mount the capacitor at a position which is located above when installing the capacitor.
[0027]
In the above-described embodiment, the safety device is attached to the gas-filled or oil-filled condenser, but the present invention is not limited to this. However, it can also be attached to something other than similar electrical equipment.
[0028]
【The invention's effect】
As described above, in the safety device of the first aspect, since the shape of the receiving blade has a large effect of breaking the pressure release plate, the internal pressure is reduced in a short time, which can contribute to the improvement of the performance of the safety device.
[0029]
According to the safety device of the second aspect, the pressure release plate and the receiving blade are merely fitted into the step provided inside the same cylindrical body, and no fine adjustment of the position is required. Since it can be accurately attached to the device, the assembling work can be facilitated and the operation can be stabilized.
[0030]
Furthermore, according to the safety device of the third aspect, the receiving blade can be fixed by utilizing the elasticity of the receiving blade, so that the safety device can be easily assembled.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a safety device according to an embodiment of the present invention.
FIG. 2 is a sectional view of the embodiment.
FIG. 3 is a plan view of a receiving blade used in the embodiment.
FIG. 4 is a front view of the receiving blade.
FIG. 5 is a front view of the gas-filled capacitor according to the embodiment of the present invention.
FIG. 6 is a graph showing the results of a prototype according to the example.
FIG. 7 is an external view of an oil-filled capacitor according to another embodiment of the present invention.
FIG. 8 is an external view of an oil-filled capacitor according to another embodiment of the present invention.
FIG. 9 is an external view of an oil-filled capacitor according to another embodiment of the present invention.
FIG. 10 is an external view of an oil-filled capacitor according to another embodiment of the present invention.
FIG. 11 is a sectional view of a conventional safety device.
FIG. 12 is a top view of a pressure release plate used in the conventional example.
FIG. 13 is a sectional view of another conventional safety device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Closed container 2 Conducting hole 3 Cylindrical body 4 Pressure relief plate 5 Receiving blade 6 Discharge hole 7 Collar 8 of pressure relief plate 8 Upper step 10 Lower step 12 Blade part 13 Base

Claims (4)

密閉容器に設けた導通孔の周囲に筒状体を取付ける一方、上記筒状体の内周部には、球状部分を有する可撓性の放圧板を、その凸面が上記導通孔に面するよう取付けて筒状体の内外を区画し、さらに上記放圧板よりも外方の位置には、上記密閉容器の内圧上昇による上記放圧板の凹凸反転動作時に、上記放圧板を破損させるため受刃を配置した安全装置において、上記受刃は、上記放圧板の破損時の亀裂進行方向に交差するように曲成したＳ字形の刃部分を有することを特徴とする安全装置。While attaching the cylindrical body around the conduction hole provided in the closed container, a flexible pressure-release plate having a spherical portion is provided on the inner peripheral portion of the cylindrical body so that the convex surface faces the conduction hole. Attach and partition the inside and outside of the cylindrical body, and further, at a position outside of the pressure release plate, at the time of reversing the unevenness of the pressure release plate due to the increase of the internal pressure of the closed container, a receiving blade to damage the pressure release plate. In the safety device arranged, the receiving blade has an S-shaped blade portion curved so as to intersect with a crack progressing direction when the pressure relief plate is broken. 上記筒状体の内周部には、一対の段部が周設され、一方の段部には放圧板が、他方の段部には受刃がそれぞれ嵌入されていることを特徴とする請求項１の安全装置。A pair of steps are provided around the inner periphery of the cylindrical body, and a pressure-releasing plate is fitted into one of the steps, and a receiving blade is fitted into the other step. Item 1. The safety device according to Item 1. 上記受刃の両端部には摺接部が形成され、上記受刃は上記段部に対し、上記摺接部を段部周壁面に弾性的に押圧、接触させた状態で嵌入されていることを特徴とする請求項２の安全装置。Sliding contact portions are formed at both end portions of the receiving blade, and the receiving blade is fitted into the step portion in a state where the sliding contact portion is elastically pressed and brought into contact with the peripheral wall surface of the step portion. 3. The safety device according to claim 2, wherein: 上記密閉容器には、コンデンサ素子等の電気機器を収納していることを特徴とする請求項１、請求項２又は請求項３いずれかの安全装置。The safety device according to any one of claims 1 to 3, wherein an electric device such as a capacitor element is housed in the closed container.
JP28547293A 1993-10-08 1993-10-08 Safety device Expired - Lifetime JP3551263B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28547293A JP3551263B2 (en) 1993-10-08 1993-10-08 Safety device

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Application Number Priority Date Filing Date Title
JP28547293A JP3551263B2 (en) 1993-10-08 1993-10-08 Safety device

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JP3551263B2 true JP3551263B2 (en) 2004-08-04

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DE102016004648A1 (en) * 2016-04-16 2017-10-19 Daimler Ag Pressure relief device for a battery case, battery case with the pressure relief device, battery and method for depressurizing a battery
CN111919367A (en) * 2018-03-28 2020-11-10 日本电产株式会社 Motor with a stator having a stator core
CN113906625B (en) * 2021-03-22 2023-06-23 宁德新能源科技有限公司 Battery core and electricity utilization device

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