JP6513423B2 - Explosion-proof valve - Google Patents

Explosion-proof valve Download PDF

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JP6513423B2
JP6513423B2 JP2015033702A JP2015033702A JP6513423B2 JP 6513423 B2 JP6513423 B2 JP 6513423B2 JP 2015033702 A JP2015033702 A JP 2015033702A JP 2015033702 A JP2015033702 A JP 2015033702A JP 6513423 B2 JP6513423 B2 JP 6513423B2
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rupture
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explosion
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proof valve
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弘幸 下岡
弘幸 下岡
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Nok Corp
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Description

本発明は、防爆弁に関する。本発明の防爆弁は例えば、自動車関連の分野または電気機器関連の分野などで用いられる。また、本発明の防爆弁は例えば、コンデンサの封口部に装着され、あるいはキャパシタや二次電池の封口部などに装着される。   The present invention relates to an explosion-proof valve. The explosion-proof valve of the present invention is used, for example, in the field related to automobiles or the field related to electrical equipment. In addition, the explosion-proof valve of the present invention is attached to, for example, a sealing part of a capacitor, or to a sealing part of a capacitor or a secondary battery.

現在、大型コンデンサの内部で発生するガス圧を調整するため、図５に示すような、膜部５２を備えるシリコーン製の弁５１が用いられている。   Currently, in order to adjust the gas pressure generated inside the large-sized capacitor, a silicone valve 51 provided with a membrane portion 52 as shown in FIG. 5 is used.

この弁５１は、機器の定常作動時、膜部５２からガスを透過させることで微圧を調整するとともに、異常時、急激な圧力上昇が生じたときには膜部５２が破裂作動して圧力を開放することによりコンデンサが爆発するのを防止する。   The valve 51 regulates a slight pressure by allowing gas to permeate from the membrane 52 during steady operation of the device, and in an abnormal case, the membrane 52 bursts and releases the pressure when a rapid pressure rise occurs. Prevents the capacitor from exploding.

よって、この弁５１は「防爆弁」や「安全弁」とも称され、その機能として膜部５２には、定常時における「ガス透過性」と、異常時における膜部５２の破裂による「防爆性」とが必要とされる。   Therefore, the valve 51 is also referred to as an "explosion-proof valve" or "safety valve", and the function of the membrane 52 is "gas permeability" at steady state and "explosion-proof" by rupture of the membrane 52 at abnormal time. And are required.

ここで、前者のガス透過性を向上するには、膜部５２の透過面積を増大し、膜部５２の厚みを薄くすることが有効であるが、このように透過面積を増大し厚みを薄くすると、膜部５２の強度が低下するため、破裂時の圧力（膜部５２を破裂させる圧力の大きさ）が低下してしまうことになる。   Here, in order to improve the gas permeability of the former, it is effective to increase the permeation area of the membrane part 52 and reduce the thickness of the membrane part 52, but it is thus effective to increase the permeation area and make the thickness thin Then, since the strength of the membrane 52 is reduced, the pressure at the time of rupture (the magnitude of the pressure for bursting the membrane 52) is reduced.

昨今におけるコンデンサの性能向上により、発生する内部ガスは増える傾向にあり、よってガス透過性を向上するようにとの要求があるが、その一方で、防爆弁５１の破裂はコンデンサの寿命に直接つながるため、破裂時の圧力が低下することは避けたいとの要求がある。   With the recent improvement of the performance of capacitors, the internal gas generated tends to increase, so there is a demand to improve the gas permeability, but on the other hand, the explosion-proof valve 51 directly leads to the life of the capacitor Therefore, there is a demand to avoid that the pressure at the time of rupture is reduced.

特開２０１４−２１２１４２号公報JP 2014-212142 A 特開２０１４−２０９５２４号公報JP, 2014-209524, A 特開２０１４−３６１１７号公報JP, 2014-36117, A 特開平１０−５０５６９号公報Japanese Patent Application Laid-Open No. 10-50569

本発明は以上の点に鑑みて、膜部の破裂作動による防爆性を維持しつつ、ガス透過性を向上することができる防爆弁を提供することを目的とする。   SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide an explosion-proof valve capable of improving the gas permeability while maintaining the explosion-proof property by the rupture operation of the membrane part.

上記目的を達成するため、本発明の請求項１による防爆弁は、ガス透過性を備える弾性体により一体に成形され、圧力容器の封口部に装着される防爆弁であって、
筒状の取付部と、
前記圧力容器の内外を遮断するように配置される膜部と、
前記膜部の平面上一部に設けられ、前記圧力容器の内圧が所定値に達したときに破裂作動して前記内圧を開放する破裂部と、
前記膜部の平面上一部に設けられ、その強度を前記破裂部の強度よりも高く設定されることにより前記圧力容器の内圧が所定値に達しても破裂作動せず、その厚みを前記膜部の厚みよりも小さく設定されることによりガス透過性を促進するガス透過部と、
を備え、
前記膜部は、平面円形に形成され、
前記破裂部は、前記膜部の平面中央に設けられ、かつ平面円形に形成され、
前記ガス透過部は、前記破裂部の周りに等配で設けられていることを特徴とする。 In order to achieve the above object, the explosion-proof valve according to claim 1 of the present invention is an explosion-proof valve which is integrally formed of an elastic body having gas permeability and attached to a sealing portion of a pressure vessel,
A cylindrical mounting portion,
A membrane portion arranged to block the inside and the outside of the pressure vessel;
A rupture portion provided on a part of a planar surface of the membrane portion, and ruptured to release the internal pressure when the internal pressure of the pressure vessel reaches a predetermined value;
It is provided on a part of the flat surface of the membrane part and its strength is set higher than the strength of the rupture part so that the rupture action does not occur even if the internal pressure of the pressure vessel reaches a predetermined value, A gas permeable portion that promotes gas permeability by being set smaller than the thickness of the portion;
Equipped with
The film portion is formed in a plane circle,
The rupture portion is provided in the center of the plane of the membrane portion, and is formed in a plane circle.
The gas permeable portions may be provided equidistantly around the rupture portion .

上記構成を備える本発明の防爆弁においては、所定の厚み寸法を備える膜部の平面上一部に、圧力容器の内圧が所定値に達したときに破裂作動して内圧を開放する破裂部が設けられているため、先ずはこの破裂部が破裂することによって、従来と同等の防爆性を確保することが可能とされ、併せて、同じく膜部の平面上一部に、破裂作動せず、かつ膜部よりも薄肉であることによりガス透過性を促進するガス透過部が設けられているため、このガス透過部をガスが透過することによって、ガス透過性を向上することが可能とされる。   In the explosion-proof valve of the present invention having the above-described configuration, the rupture portion operates to rupture when the internal pressure of the pressure vessel reaches a predetermined value to open the internal pressure on a part of the plane of the membrane portion having a predetermined thickness dimension. Since it is provided, it is possible to first ensure that the same explosion protection as before can be secured by the rupture of this rupture part, and in addition, the rupture operation does not occur on a part of the plane of the membrane part as well. In addition, since a gas permeable portion that promotes gas permeability by being thinner than the membrane portion is provided, gas permeability can be improved by allowing gas to permeate through the gas permeable portion. .

尚、圧力容器の内圧が所定値に達したとき、破裂部が破裂してもガス透過部が破裂しないのは、破裂部よりもガス透過部のほうが強度が高いためであり、このためガス透過部には以下に例示する特性が設定される。
（ａ）ガス透過部の厚みを破裂部の厚みと同じとして、ガス透過部の平面積を破裂部の平面積よりも小さくする。
（ｂ）反対に、ガス透過部の平面積を破裂部の平面積と同じとして、ガス透過部の厚みを破裂部の厚みよりも大きくする。
（ｃ）また、これら双方を備える態様として、ガス透過部の平面積を破裂部の平面積よりも小さくし、かつガス透過部の厚みを破裂部の厚みよりも大きくする。
（ｄ）ガス透過部の平面形状を細長（幅狭）の形状として、破裂しにくくする。 When the internal pressure of the pressure vessel reaches a predetermined value, the gas permeation portion does not rupture even if the rupture portion ruptures because the strength of the gas permeation portion is higher than that of the rupture portion, and hence the gas permeation In the part, the characteristics exemplified below are set.
(A) The planar area of the gas permeable portion is made smaller than the planar area of the ruptured portion, with the thickness of the gas permeable portion being the same as the thickness of the ruptured portion.
(B) Conversely, the thickness of the gas permeable part is made larger than the thickness of the ruptured part, with the planar area of the gas permeable part being the same as the planar area of the ruptured part.
(C) Further, as an aspect including both of them, the plane area of the gas permeable portion is made smaller than the plane area of the rupture portion, and the thickness of the gas permeable portion is made larger than the thickness of the rupture portion.
(D) The planar shape of the gas-permeable portion is elongated (narrow) to make it difficult to rupture.

また、ガス透過部を膜部の平面上に複数設けることにより、ガス透過性を一層促進することができる。   Moreover, gas permeability can be further promoted by providing a plurality of gas permeable parts on the plane of the membrane part.

本発明は、以下の効果を奏する。   The present invention has the following effects.

すなわち本発明においては以上説明したように、膜部の平面上一部に破裂部およびガス透過部を双方設けることにより、膜部の破裂作動による防爆性を維持しつつ、ガス透過性を向上することができる。   That is, in the present invention, as described above, the gas permeability is improved while maintaining the explosion-proof property by the rupture operation of the membrane portion by providing both the rupture portion and the gas permeation portion on a part of the plane of the membrane portion. be able to.

本発明の実施例に係る防爆弁を示す図で、（Ａ）はその平面図、（Ｂ）はその断面図であって（Ａ）におけるＥ−Ｅ線断面図BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the explosion-proof valve which concerns on the Example of this invention, (A) is the top view, (B) is the sectional drawing, and the EE sectional drawing in (A) 同防爆弁の装着状態を示す断面図Sectional view showing the mounting state of the same explosion-proof valve 本発明の他の実施例に係る防爆弁の要部平面図Top view of essential parts of an explosion-proof valve according to another embodiment of the present invention 本発明の他の実施例に係る防爆弁の要部平面図Top view of essential parts of an explosion-proof valve according to another embodiment of the present invention 従来例に係る防爆弁の断面図Cross-sectional view of a conventional explosion-proof valve

本発明には、以下の実施形態が含まれる。
（１）ガス透過性向上のため、膜部の透過面積をアップし、膜厚を薄くした仕様でも、膜部の強度が低下しない仕様とし、これにより従来の問題を解決する。具体的には、膜部に薄い箇所と厚い箇所を設けて、薄い箇所からガスを透過させ、厚い箇所で圧力を支えて強度を確保する。
（２）本発明によれば、内圧を多く逃がすことができるようになるため、電解液の増量や電圧のアップが可能となり、コンデンサの性能をアップすることができる。また、使用温度範囲を拡大できる可能性もあり、コンデンサの用途が拡大することから、自動車関連や電機関連に使用するキャパシタ・コンデンサの性能向上に寄与することができる。 The present invention includes the following embodiments.
(1) In order to improve the gas permeability, even if the transmission area of the membrane part is increased and the film thickness is reduced, the strength of the membrane part is not reduced, thereby solving the conventional problems. Specifically, thin portions and thick portions are provided in the membrane portion, gas is allowed to permeate from the thin portions, and pressure is supported at the thick portions to ensure strength.
(2) According to the present invention, since a large amount of internal pressure can be released, the amount of electrolytic solution can be increased and the voltage can be increased, and the performance of the capacitor can be improved. In addition, there is a possibility that the operating temperature range can be expanded, and the application of the capacitor is expanded, which can contribute to the improvement of the performance of the capacitor / capacitor used in the automobile-related or electric-related devices.

（３）本発明では、破裂部は所定の圧力で破裂する従来の防爆弁としての機能を持たせ、透過性を向上するため、薄肉のガス透過部を設ける構成とする。これにより、所定の防爆性能を維持しつつ、ガス透過性能を向上することができる。ガス透過部は破裂部よりも強度があるような構造であれば良い。
（４）十分なガス透過量を得るために、膜厚はより薄いほうが好ましい。しかし薄くなり過ぎると破裂部より先に破裂してしまう問題がある。このため、ガス透過部は膜厚を薄くしても破裂しにくい形状とする。また、透過性のためには、膜面積も大きいほうが良い。
（５）破裂部において、破裂強度のバラつきは小さいほうが良いので、膜口径を小さくし過ぎると設定膜厚が薄くなり過ぎ、成形が難しいので、適当な膜厚となる口径を設定する。 (3) In the present invention, the rupture portion has a function as a conventional explosion-proof valve that ruptures at a predetermined pressure, and in order to improve permeability, a thin gas permeable portion is provided. Thereby, the gas permeation performance can be improved while maintaining a predetermined explosion proof performance. The gas permeable portion may have a structure that is stronger than the ruptured portion.
(4) The film thickness is preferably thinner to obtain a sufficient gas permeation amount. However, if it becomes too thin, there is a problem that it ruptures earlier than the ruptured part. For this reason, the gas permeable portion is shaped so as not to be easily ruptured even if the film thickness is reduced. Also, for permeability, it is better for the membrane area to be larger.
(5) In the rupture portion, the smaller the variation in burst strength, the better. If the diameter of the membrane is too small, the set film thickness becomes too thin and molding is difficult.

（６）ガス透過部は、ガス透過部１つ当たりの平面積を小さくして（平面円形の場合はその径を小さくする）破裂しにくくし、数を多くしてガス透過面積を拡大する。
（７）ガス透過部は、その平面形状を細長い形状として（例えば平面形状を円弧形とする）破裂しにくくし、ガス透過面積を拡大する。 (6) The gas permeation part makes the plane area per gas permeation part small (in the case of a plane circle, the diameter is made small) to make it difficult to burst and increase the number to enlarge the gas permeation area.
(7) The gas permeable portion has a flat shape with an elongated shape (for example, an arc shape of the flat shape), so that it is difficult to burst and the gas permeable area is expanded.

つぎに本発明の実施例を図面にしたがって説明する。   Next, an embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の実施例に係る防爆弁１１を示し、図１（Ａ）はその平面図、図１（Ｂ）はその断面図であって図１（Ａ）におけるＥ−Ｅ線断面図を示している。また、図２は同防爆弁１１の装着状態を示している。   FIG. 1 shows an explosion-proof valve 11 according to an embodiment of the present invention, FIG. 1 (A) is a plan view thereof, and FIG. 1 (B) is a cross-sectional view thereof. Figure is shown. Further, FIG. 2 shows the mounting state of the explosion-proof valve 11.

当該実施例に係る防爆弁１１は、圧力容器の一種であるコンデンサ（図示せず）の封口部（封口板の貫通穴部）２１（図２参照）に装着（圧入）され、機器の定常作動時、コンデンサ内部Ｃで発生するガスの一部を透過させて外部Ｄへ放出することによりコンデンサ内部Ｃの圧力を調整するとともに、異常時、コンデンサ内部Ｃで急激な圧力上昇が生じたときに破裂作動して内部Ｃの高圧を外部Ｄへ開放することによりコンデンサが爆発するのを防止する。   The explosion-proof valve 11 according to the embodiment is attached (press-fitted) to the sealing portion (through hole portion of the sealing plate) 21 (see FIG. 2) of a capacitor (not shown) which is a type of pressure vessel. When the pressure inside the capacitor C is adjusted by transmitting part of the gas generated in the capacitor C internally and releasing it to the outside D, it bursts when a sudden pressure rise occurs in the capacitor C at abnormal times By operating to release the internal C high pressure to the external D, the capacitor is prevented from exploding.

また、当該防爆弁１１は、シリコーンゴム等の、ガス透過性を備える弾性体を成形材料として金型にて一体に成形されており、筒状の取付部１２の一端に正圧（内圧）に対するフランジ状の抜け止め用係合部（抜け止め部）１３が設けられるとともに、他端に逆圧（外圧）に対する抜け止め用係合部（抜け止め部）１４および膜部１５が設けられ、この膜部１５がコンデンサの内部Ｃと外部Ｄを遮断するよう配置されるので、この膜部１５が上記した定常作動時におけるガス透過性と異常時における防爆性（防爆作動性）とを発揮する。   Further, the explosion-proof valve 11 is integrally formed of a gas-permeable elastic material such as silicone rubber as a molding material by a mold, and one end of the cylindrical attachment portion 12 is subjected to a positive pressure (internal pressure) A flange-shaped retaining engagement portion (disengagement retaining portion) 13 is provided, and at the other end, a detachment preventing engagement portion (disengagement retaining portion) 14 against the reverse pressure (external pressure) and a membrane portion 15 are provided. Since the film portion 15 is disposed so as to shut off the inside C and the outside D of the capacitor, the film portion 15 exhibits the gas permeability in the above-described steady operation and the explosion proof (explosion proof operation) in the abnormal state.

膜部１５は、所定の厚みｔ１を備える平面円形の膜状に形成されているが、当該実施例では、とくに、この膜部１５の平面上一部に、コンデンサの内圧が所定値に達したときに破裂作動して内圧を開放することにより上記防爆性を発揮する破裂部１６が設けられるとともに、同じく膜部１５の平面上一部に、破裂作動せず、かつ上記ガス透過性を促進するガス透過部１７が併せ設けられている。 Film 15 has been formed in a planar circular membrane having a predetermined thickness t 1, in this embodiment, in particular, on a plane part of the film unit 15, the internal pressure of the capacitor reaches a predetermined value While the rupture portion 16 which exhibits the above-mentioned explosion-proof property is provided by rupturing operation and releasing the internal pressure at the same time, it does not perform the rupture operation in a part of the plane of the membrane portion 15 as well. A gas permeable portion 17 is also provided.

破裂部１６は、所定の平面積および厚みｔ２を備える平面円形の薄膜状に形成されており、その厚みｔ２が膜部１５の厚みｔ１よりも小さく設定されているのでその強度が膜部１５よりも弱められており、よってコンデンサの内圧が所定値に達したときに破裂作動して内圧を開放することにより上記防爆性を発揮する。 The ruptured portion 16 is formed in a planar circular thin film having a predetermined planar area and thickness t 2 , and since its thickness t 2 is set smaller than the thickness t 1 of the membrane portion 15, its strength is It is weaker than the portion 15, and therefore, when the internal pressure of the condenser reaches a predetermined value, the explosion action is exerted to release the internal pressure, thereby exhibiting the above-mentioned explosion-proof property.

一方、ガス透過部１７は、所定の平面積および厚みｔ３を備える平面略三角形の薄膜状に形成されており、その厚みｔ３が膜部１５の厚みｔ１よりも小さく設定されているので上記ガス透過性を促進することができるが、その強度は破裂部１６よりも強く設定されており、よってコンデンサの内圧が所定値に達しても破裂作動しないように設定されている。 On the other hand, the gas permeable portion 17 is formed in a thin film of a substantially triangular flat surface having a predetermined planar area and thickness t 3 , and the thickness t 3 is set smaller than the thickness t 1 of the film portion 15. Although the gas permeability can be promoted, its strength is set to be stronger than that of the rupture portion 16 so that it does not rupture even if the internal pressure of the capacitor reaches a predetermined value.

ガス透過部１７の強度が破裂部１６よりも強いのは、ガス透過部１７の厚みは破裂部１６の厚みと同じであるものの、ガス透過部１７の平面積が破裂部１６の平面積よりも小さいことによる。   The gas-permeable portion 17 is stronger than the ruptured portion 16 in that the thickness of the gas-permeable portion 17 is the same as the thickness of the ruptured portion 16, but the plane area of the gas-permeable portion 17 is greater than the plane area of the ruptured portion 16. By small.

また、破裂部１６は、膜部１５の平面上に１箇所設けられており、これに対し、ガス透過部１７は膜部１５の平面上に複数個所（図では４箇所）設けられている。   Further, the rupture portion 16 is provided at one place on the flat surface of the membrane part 15, whereas the gas permeable part 17 is provided at a plurality of places (four places in the figure) on the flat surface of the membrane part 15.

また、破裂部１６は、膜部１５の平面上中央位置に設けられており、これに対し、ガス透過部１７は破裂部１６の周りの位置に放射状・等配状に設けられている。   In addition, the rupture portion 16 is provided at a central position on the plane of the membrane portion 15, while the gas permeable portion 17 is provided radially and equidistantly around the rupture portion 16.

尚、当該防爆弁１１において、コンデンサの内圧が所定値に達したときに破裂作動するのは膜部１５における破裂部１６のみであり、上記したようにガス透過部１７は破裂作動せず、また膜部１５における破裂部１６およびガス透過部１７を設けた部位以外の、厚みｔ１の部位も破裂作動しない。 In the explosion-proof valve 11, only the ruptured part 16 in the membrane part 15 is ruptured when the internal pressure of the condenser reaches a predetermined value, and the gas permeation part 17 does not rupture as described above, and other than portions provided with the rupture portion 16 and the gas permeable portion 17 of film 15, no rupture operation site of thickness t 1.

上記構成を備える防爆弁１１においては所定の厚みｔ１を備える膜部１５の平面上一部に、コンデンサの内圧が所定値に達したときに破裂作動して内圧を開放する破裂部１６が設けられているため、先ずはこの破裂部１６によって、防爆性を確保することが可能とされ、併せて、同じく膜部１５の平面上一部に、破裂作動せず、かつ膜部１５よりも薄肉であることによりガス透過性を促進するガス透過部１７が設けられているため、このガス透過部１７によって、ガス透過性を向上することが可能とされている。 On a plane portion of the film portion 15 having a predetermined thickness t 1 in the explosion-proof valve 11 having the above construction, the rupture portion 16 is provided with the internal pressure of the capacitor to release the internal pressure burst operation when it reaches a predetermined value Therefore, first, the explosion-proof property can be secured by the ruptured part 16, and in addition, the film part 15 is not ruptured in part on the plane of the film part 15 and thinner than the film part 15. Since the gas permeation part 17 which promotes the gas permeability is provided by this, it is possible to improve the gas permeability by the gas permeation part 17.

また、ガス透過部１７が膜部１５の平面上に複数設けられているため、ガス透過性を一層促進することができる。   In addition, since a plurality of gas permeable portions 17 are provided on the plane of the membrane portion 15, gas permeability can be further promoted.

ガス透過部１７は、その平面積が小さいほど強度が高められるので、一層破裂しにくくなる。したがってガス透過部１７の平面積を小さくすることにより破裂しにくくし、その設置数を多くすることによりガス透過面積を増大させるのが有効である。   The strength of the gas-permeable portion 17 is enhanced as the planar area thereof is smaller, so the gas-permeable portion 17 becomes more difficult to rupture. Therefore, it is effective to make it difficult to rupture by reducing the planar area of the gas permeable portion 17 and to increase the gas permeable area by increasing the number of the gas permeable portions.

この観点からして、図３に示す他の実施例では、平面円形のガス透過部１７を小径として破裂しにくくし、その設置数を多く（図では８箇所）することによりガス透過面積を増大させる構造とされている。   From this point of view, in the other embodiment shown in FIG. 3, it is difficult to rupture the flat circular gas transmission part 17 with a small diameter, and the number of installation is increased (eight places in the drawing) to increase the gas transmission area. It is supposed to be

また、ガス透過部１７の強度を高めて破裂しにくくするには、ガス透過部１７の平面形状を細長（幅狭）の形状とすることも考えられ、この観点からして図４に示す他の実施例では、ガス透過部１７の平面形状を細長の円弧形とすることによりガス透過部１７の強度を高める構造とされている。円弧形は膜部１５の平面上中央位置を中心点とする円弧形である。ガス透過部１７の平面形状を細長の円弧形とすれば、その設置数が比較的少なくても（図では３箇所）、ガス透過面積を増大させることができる。   Moreover, in order to increase the strength of the gas transmission part 17 and make it difficult to rupture, it is also conceivable to make the planar shape of the gas transmission part 17 into a slender (narrow) shape, and from this point of view In the second embodiment, the gas permeable portion 17 has a flat arc shape in a plan view to increase the strength of the gas permeable portion 17. The arc shape is an arc shape having a central position on the plane of the film portion 15 as a center point. If the planar shape of the gas transmission part 17 is made into a slender circular arc, the gas transmission area can be increased even if the number of installation is relatively small (three places in the figure).

１１ 防爆弁
１２ 取付部
１３，１４ 抜け止め用係合部
１５ 膜部
１６ 破裂部
１７ ガス透過部
２１ コンデンサ封口部 DESCRIPTION OF SYMBOLS 11 Explosion-proof valve 12 mounting part 13, 14 Engagement part for prevention 15 membrane part 16 bursting part 17 gas permeation part 21 capacitor sealing part

Claims (1)

ガス透過性を備える弾性体により一体に成形され、圧力容器の封口部に装着される防爆弁であって、
筒状の取付部と、
前記圧力容器の内外を遮断するように配置される膜部と、
前記膜部の平面上一部に設けられ、前記圧力容器の内圧が所定値に達したときに破裂作動して前記内圧を開放する破裂部と、
前記膜部の平面上一部に設けられ、その強度を前記破裂部の強度よりも高く設定されることにより前記圧力容器の内圧が所定値に達しても破裂作動せず、その厚みを前記膜部の厚みよりも小さく設定されることによりガス透過性を促進するガス透過部と、
を備え、
前記膜部は、平面円形に形成され、
前記破裂部は、前記膜部の平面中央に設けられ、かつ平面円形に形成され、
前記ガス透過部は、前記破裂部の周りに等配で設けられていることを特徴とする防爆弁。 An explosion-proof valve integrally formed of an elastic body having gas permeability and attached to a sealing portion of a pressure vessel,
A cylindrical mounting portion,
A membrane portion arranged to block the inside and the outside of the pressure vessel;
A rupture portion provided on a part of a planar surface of the membrane portion, and ruptured to release the internal pressure when the internal pressure of the pressure vessel reaches a predetermined value;
It is provided on a part of the flat surface of the membrane part and its strength is set higher than the strength of the rupture part so that the rupture action does not occur even if the internal pressure of the pressure vessel reaches a predetermined value, A gas permeable portion that promotes gas permeability by being set smaller than the thickness of the portion;
Equipped with
The film portion is formed in a plane circle,
The rupture portion is provided in the center of the plane of the membrane portion, and is formed in a plane circle.
The explosion-proof valve , wherein the gas permeable parts are provided equidistantly around the rupture part .
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