JP2019153477A - Surge protective element - Google Patents

Surge protective element Download PDF

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JP2019153477A
JP2019153477A JP2018038158A JP2018038158A JP2019153477A JP 2019153477 A JP2019153477 A JP 2019153477A JP 2018038158 A JP2018038158 A JP 2018038158A JP 2018038158 A JP2018038158 A JP 2018038158A JP 2019153477 A JP2019153477 A JP 2019153477A
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plate
insulating member
surge protection
protection element
groove
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JP6939648B2 (en
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良市 杉本
Ryoichi Sugimoto
良市 杉本
尾木 剛
Takeshi Ogi
剛 尾木
田中 芳幸
Yoshiyuki Tanaka
芳幸 田中
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Mitsubishi Materials Corp
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Abstract

To provide a surge protective element capable of suppressing degradation of life properties caused by metal vapor generated during discharge.SOLUTION: The surge protective element includes: an insulation tube; a pair of sealing electrode for closing openings at both ends of the insulation tube to seal discharge control gas; a planar insulation member 4 which is housed in the insulation tube and whose end parts 4b are in contact with the pair of sealing electrode; and a discharge auxiliary section 5 formed from conductive material in the center of the planar insulation member. The planar insulation member includes a groove part 4a formed, extending in such a direction as to cross an axial line of the insulation tube, between an end part of at least one surface and the discharge auxiliary section.SELECTED DRAWING: Figure 2

Description

本発明は、落雷等で発生するサージから様々な機器を保護し、事故を未然に防ぐのに使用するサージ防護素子に関する。   The present invention relates to a surge protection element used for protecting various devices from a surge caused by a lightning strike and preventing accidents.

電話機、ファクシミリ、モデム等の通信機器用の電子機器が通信線との接続する部分、電源線、アンテナ或いはCRT駆動回路等、雷サージや静電気等の異常電圧(サージ電圧)による電撃を受けやすい部分には、異常電圧によって電子機器やこの機器を搭載するプリント基板の熱的損傷又は発火等による破壊を防止するために、サージ防護素子が接続されている。   Portions where electronic devices for communication equipment such as telephones, facsimiles, modems, etc. are connected to communication lines, power lines, antennas, CRT drive circuits, etc. A surge protection element is connected to the electronic device and a printed circuit board on which the device is mounted due to abnormal voltage to prevent destruction due to thermal damage or fire.

従来、サージ防護素子として、例えば特許文献1に示すように、ガラス管と、ガラス管の両端開口部を閉塞して内部に放電ガスを封止する一対の封止電極と、両端に一対の封止電極を配してガラス管内に収納された板状碍子とを備えたサージアブソーバが記載されている。このサージアブソーバでは、板状碍子の表面中央に導電性材料であるカーボンのトリガ部が形成されているカーボントリガ型のサージ防護素子である。   Conventionally, as a surge protection element, for example, as shown in Patent Document 1, a glass tube, a pair of sealing electrodes that closes both ends of the glass tube and seals discharge gas inside, and a pair of seals at both ends. A surge absorber is described that includes a plate-like insulator provided with a stop electrode and housed in a glass tube. This surge absorber is a carbon trigger type surge protection element in which a carbon trigger portion, which is a conductive material, is formed at the center of the surface of the plate-like insulator.

特開2010−192322号公報JP 2010-192322 A

上記従来の技術には、以下の課題が残されている。
従来のカーボントリガ型のサージ防護素子では、ガラス管の内径が小さくなると、放電時の封止電極から発生した金属蒸気が板状碍子の表面に付着し易く、繰り返しの寿命特性が早期に劣化してしまう問題があった。すなわち、寿命特性の劣化は、放電開始電圧Vsの低下が主であり、その要因は放電時に生じた金属蒸気が板状碍子の絶縁表面を汚損することによる。特に、ガラス管内径を小さくしてサージ防護素子を小型化しようとすると、放電時の封止電極から発生した金属蒸気が板状碍子の表面に容易に付着し、寿命特性が早期に劣化してしまう不都合があった。
The following problems remain in the conventional technology.
In the conventional carbon trigger type surge protection element, when the inner diameter of the glass tube is reduced, the metal vapor generated from the sealing electrode during discharge tends to adhere to the surface of the plate-like insulator, and the repeated life characteristics deteriorate early. There was a problem. That is, the deterioration of the life characteristics is mainly due to the decrease of the discharge start voltage Vs, and the cause thereof is that the metal vapor generated during the discharge contaminates the insulating surface of the plate insulator. In particular, when attempting to reduce the size of the surge protection element by reducing the inner diameter of the glass tube, the metal vapor generated from the sealing electrode during discharge easily adheres to the surface of the plate-like insulator, and the life characteristics deteriorate early. There was an inconvenience.

本発明は、前述の課題に鑑みてなされたもので、放電時に生じた金属蒸気による寿命特性の劣化を抑制することができるサージ防護素子を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a surge protection element that can suppress deterioration of life characteristics due to metal vapor generated during discharge.

本発明は、前記課題を解決するために以下の構成を採用した。すなわち、第1の発明のサージ防護素子は、絶縁性管と、前記絶縁性管の両端開口部を閉塞して内部に放電制御ガスを封止する一対の封止電極と、前記絶縁性管内に収納され両端部が一対の前記封止電極に接触した板状絶縁性部材と、前記板状絶縁性部材の中央に導電性材料で形成された放電補助部とを備え、前記板状絶縁性部材が、少なくとも一方の面の端部と前記放電補助部との間に前記絶縁性管の軸線を横切る方向に延在して形成された溝部を有していることを特徴とする。   The present invention employs the following configuration in order to solve the above problems. That is, the surge protection element of the first invention includes an insulating tube, a pair of sealing electrodes that closes both ends of the insulating tube and seals the discharge control gas inside, and the insulating tube. A plate-like insulating member housed at both ends thereof in contact with the pair of sealing electrodes; and a discharge assisting portion formed of a conductive material at the center of the plate-like insulating member. However, it has a groove formed so as to extend in a direction crossing the axis of the insulating tube between the end of at least one surface and the auxiliary discharge portion.

このサージ防護素子では、板状絶縁性部材が、少なくとも一方の面の端部と放電補助部との間に絶縁性管の軸線を横切る方向に延在した溝部が形成されているので、溝部内の封止電極に近い側の壁面は飛び散る金属粒子の飛散方向の陰となるため金属で汚損され難く、溝部よりも内側(中心側)の汚損を防止することができる。また、溝部内には金属蒸気による金属の付着がし難く、溝部内も金属で汚損され難い部分となり、表面の絶縁性を確保することができる。したがって、板状絶縁性部材の溝部よりも内側の表面に金属で汚損されない部分が形成されることで、放電開始電圧の低下を抑えることができる。   In this surge protection element, the plate-like insulating member is formed with a groove extending in a direction crossing the axis of the insulating tube between the end of at least one surface and the discharge auxiliary portion. The wall surface on the side close to the sealing electrode is behind the scattering direction of the scattered metal particles, so that it is difficult to be stained with metal, and the inner side (center side) of the groove can be prevented. In addition, it is difficult for the metal vapor to adhere to the inside of the groove portion, and the inside of the groove portion becomes a portion that is not easily contaminated with metal, so that insulation of the surface can be ensured. Therefore, a reduction in the discharge start voltage can be suppressed by forming a portion that is not soiled with metal on the inner surface of the groove portion of the plate-like insulating member.

第2の発明に係るサージ防護素子は、第1の発明において、前記溝部が、前記板状絶縁性部材の両面に形成されていることを特徴とする。
すなわち、このサージ防護素子では、溝部が、板状絶縁性部材の両面に形成されているので、板状絶縁性部材の両面で溝部による汚損抑制効果を得ることができる。
According to a second aspect of the present invention, the surge protection element according to the first aspect is characterized in that the groove is formed on both surfaces of the plate-like insulating member.
That is, in this surge protection element, since the groove portion is formed on both surfaces of the plate-like insulating member, the effect of suppressing fouling by the groove portion can be obtained on both surfaces of the plate-like insulating member.

第3の発明に係るサージ防護素子は、第1又は第2の発明において、前記溝部が、前記板状絶縁性部材の全幅にわたって形成されていることを特徴とする。
すなわち、このサージ防護素子では、溝部が、板状絶縁性部材の全幅にわたって形成されているので、板状絶縁性部材の全幅にわたって溝部による汚損抑制効果を得ることができる。
A surge protection element according to a third invention is characterized in that, in the first or second invention, the groove is formed over the entire width of the plate-like insulating member.
That is, in this surge protection element, since the groove portion is formed over the entire width of the plate-like insulating member, it is possible to obtain a fouling suppression effect by the groove portion over the entire width of the plate-like insulating member.

第4の発明に係るサージ防護素子は、第1から第3の発明のいずれかにおいて、前記溝部が、前記板状絶縁性部材の前記端部と前記放電補助部との間で前記板状絶縁性部材の長さ方向に並んで複数形成されていることを特徴とする。
すなわち、このサージ防護素子では、溝部が、板状絶縁性部材の端部と放電補助部との間で板状絶縁性部材の長さ方向に並んで複数形成されているので、複数の溝部によって、より高い汚損抑制効果を得ることができる。
The surge protection device according to a fourth aspect of the present invention is the surge protection element according to any one of the first to third aspects, wherein the groove portion is formed between the end portion of the plate-like insulating member and the discharge auxiliary portion. A plurality of the sexual members are formed side by side in the length direction.
That is, in this surge protection element, a plurality of groove portions are formed side by side in the length direction of the plate-like insulating member between the end portion of the plate-like insulating member and the discharge assisting portion. Thus, a higher antifouling effect can be obtained.

本発明によれば、以下の効果を奏する。
すなわち、本発明に係るサージ防護素子によれば、板状絶縁性部材が、少なくとも一方の面の端部と放電補助部との間に絶縁性管の軸線を横切る方向に延在した溝部が形成されているので、溝部よりも内側の表面に金属が付着し難くなる。
したがって、本発明に係るサージ防護素子では、板状絶縁性部材の溝部内の封止電極に近い側の壁面よりも内側の表面に金属で汚損されない部分が形成されることで、放電開始電圧の低下を抑えることができ、寿命特性の劣化を抑制することができる。特に、小型化した際に、絶縁性管内径が小さくなった場合や、板状絶縁性部材の端部と放電補助部との距離が短くなった場合に本発明は効果的である。
The present invention has the following effects.
That is, according to the surge protection element of the present invention, the plate-like insulating member is formed with a groove portion extending in a direction crossing the axis of the insulating tube between the end portion of at least one surface and the discharge auxiliary portion. Therefore, it becomes difficult for the metal to adhere to the inner surface of the groove.
Therefore, in the surge protection device according to the present invention, a portion that is not soiled with metal is formed on the inner surface of the wall surface near the sealing electrode in the groove portion of the plate-like insulating member, so that the discharge start voltage is reduced. The decrease can be suppressed, and the deterioration of the life characteristics can be suppressed. In particular, the present invention is effective when the inner diameter of the insulating tube is reduced when the size is reduced, or when the distance between the end portion of the plate-like insulating member and the discharge auxiliary portion is shortened.

本発明に係るサージ防護素子の第1実施形態において、絶縁性管及び封止電極を破断した際のサージ防護素子を示す正面図である。In 1st Embodiment of the surge protection element which concerns on this invention, it is a front view which shows the surge protection element when an insulating tube and a sealing electrode are fractured | ruptured. 第1実施形態において、板状絶縁性部材を示す平面図(a)及びA−A線断面図(b)である。In 1st Embodiment, it is the top view (a) and AA sectional view (b) which show a plate-shaped insulating member. 第1実施形態において、金属蒸気の飛散を示す説明図である。In 1st Embodiment, it is explanatory drawing which shows scattering of metal vapor | steam. 本発明に係るサージ防護素子の第2から第4実施形態において、溝部を示す要部の拡大断面図である。In 2nd to 4th embodiment of the surge protection element which concerns on this invention, it is an expanded sectional view of the principal part which shows a groove part. 本発明に係るサージ防護素子の第5実施形態において、板状絶縁性部材を示す平面図(a)及びB−B線断面図(b)である。In 5th Embodiment of the surge protection element which concerns on this invention, it is the top view (a) and BB sectional view (b) which show a plate-shaped insulating member.

以下、本発明に係るサージ防護素子の第1実施形態を、図1から図3を参照しながら説明する。なお、以下の説明に用いる各図面では、各部材を認識可能又は認識容易な大きさとするために縮尺を適宜変更している。   Hereinafter, a first embodiment of a surge protection element according to the present invention will be described with reference to FIGS. 1 to 3. In each drawing used for the following description, the scale is appropriately changed in order to make each member recognizable or easily recognizable.

本実施形態のサージ防護素子1は、図1及び図2に示すように、絶縁性管2と、絶縁性管2の両端開口部を閉塞して内部に放電制御ガスを封止する一対の封止電極3と、絶縁性管2内に収納され両端部4bが一対の封止電極3に接触した板状絶縁性部材4と、板状絶縁性部材4の中央に導電性材料で形成された放電補助部5とを備えている。   As shown in FIGS. 1 and 2, the surge protection element 1 of this embodiment includes a pair of seals that close the insulating tube 2 and both ends of the insulating tube 2 and seal the discharge control gas inside. The stop electrode 3, the plate-like insulating member 4 housed in the insulating tube 2 and having both end portions 4 b in contact with the pair of sealing electrodes 3, and a conductive material at the center of the plate-like insulating member 4 were formed. Discharge assisting unit 5 is provided.

上記板状絶縁性部材4は、少なくとも一方の面の端部4bと放電補助部5との間に絶縁性管2の軸線を横切る方向に延在して形成された溝部4aを有している。
本実施形態では、溝部4aが板状絶縁性部材4の両面にそれぞれ形成されている。すなわち、溝部4aが、板状絶縁性部材4の片面に2本ずつ、両面で4本形成されている。
また、各溝部4aは、板状絶縁性部材4の全幅にわたって形成されている。
さらに、各溝部4aは、図2の(b)に示すように、断面形状が半円状となっている。なお、溝部4aの溝幅は、例えば0.1mmに設定される。
The plate-like insulating member 4 has a groove portion 4 a formed between the end portion 4 b of at least one surface and the discharge auxiliary portion 5 so as to extend in a direction crossing the axis of the insulating tube 2. .
In this embodiment, the groove part 4a is formed in both surfaces of the plate-shaped insulating member 4, respectively. That is, two groove portions 4 a are formed on each side of the plate-like insulating member 4 and four on both sides.
Further, each groove 4 a is formed over the entire width of the plate-like insulating member 4.
Further, each groove 4a has a semicircular cross section as shown in FIG. In addition, the groove width of the groove part 4a is set to 0.1 mm, for example.

上記絶縁性管2は、例えばガラス管であって、封止用ガラスあるいは鉛ガラスやソーダ石灰ガラスのような軟質ガラスで構成されており、円筒状となっている。また、絶縁性管2の両端近傍において封止電極3の外周面が絶縁性管2の内周面と溶着されている。
上記封止電極3は、例えばFe(鉄)−Ni(ニッケル)合金の表面を酸化銅で被覆した金属で形成された放電電極であり、円柱状となっている。また、封止電極3の外面にはリード線3aが溶接されている。このリード線3aは、銅覆鋼線等で形成されている。
The said insulating tube 2 is a glass tube, for example, Comprising: It is comprised with soft glass like sealing glass or lead glass, soda-lime glass, and is cylindrical. Further, the outer peripheral surface of the sealing electrode 3 is welded to the inner peripheral surface of the insulating tube 2 in the vicinity of both ends of the insulating tube 2.
The sealing electrode 3 is a discharge electrode made of, for example, a metal in which the surface of an Fe (iron) -Ni (nickel) alloy is coated with copper oxide, and has a cylindrical shape. A lead wire 3 a is welded to the outer surface of the sealing electrode 3. The lead wire 3a is formed of a copper-clad steel wire or the like.

上記板状絶縁性部材4は、アルミナ,ムライト焼結体などのセラミックス材料で板状に形成されている碍子である。
板状絶縁性部材4の両端部4bは、中央部よりも幅が広く設定されている。
上記放電制御ガスは、放電開始電圧などの電気特性が所望の値となるように組成などを調整された封止ガスであって、He、Ar、Ne、Xe、SF、CO、C、C、CF、H及びこれらの混合ガス等の不活性ガスである。
The plate-like insulating member 4 is an insulator formed in a plate shape with a ceramic material such as alumina or mullite sintered body.
Both ends 4b of the plate-like insulating member 4 are set wider than the center.
The discharge control gas is a sealing gas whose composition is adjusted so that electrical characteristics such as a discharge start voltage become a desired value, and is He, Ar, Ne, Xe, SF 6 , CO 2 , C 3. An inert gas such as F 8 , C 2 F 6 , CF 4 , H 2 or a mixed gas thereof.

上記放電補助部5は、導電性材料であって、例えば炭素材で形成されたカーボントリガである。
放電補助部5は、板状絶縁性部材4の中央に矩形状又は軸線に沿った短い直線状に形成されている。
The discharge auxiliary portion 5 is a conductive material, for example, a carbon trigger formed of a carbon material.
The discharge assisting part 5 is formed in the center of the plate-like insulating member 4 in the shape of a rectangle or a short straight line along the axis.

この本実施形態のサージ防護素子1では、過電圧又は過電流が侵入すると、まず放電補助部5と封止電極3との間で初期放電が行われる。この初期放電をきっかけに、さらに放電が伸展して、放電電極である一対の封止電極3間でアーク放電が行われる。このアーク放電は、板状絶縁性部材4の端部4bと封止電極3との接触する部分又はその近傍から図3に示すように進展する。   In the surge protection element 1 of this embodiment, when an overvoltage or overcurrent enters, initial discharge is first performed between the discharge assisting unit 5 and the sealing electrode 3. As a result of this initial discharge, the discharge further expands, and arc discharge is performed between the pair of sealing electrodes 3 that are discharge electrodes. This arc discharge progresses as shown in FIG. 3 from a portion where the end 4b of the plate-like insulating member 4 and the sealing electrode 3 are in contact with each other or in the vicinity thereof.

このように本実施形態のサージ防護素子1のように、板状絶縁性部材4が、少なくとも一方の面の端部4bと放電補助部5との間に絶縁性管2の軸線を横切る方向に延在した溝部4aが形成されているので、溝部4a内の封止電極3に近い側の壁面は飛び散る金属粒子の飛散方向の陰となるため金属で汚損され難く、溝部4aよりも内側(中心側)の汚損を防止することができる。   Thus, like the surge protection element 1 of the present embodiment, the plate-like insulating member 4 is in a direction crossing the axis of the insulating tube 2 between the end portion 4b of at least one surface and the discharge auxiliary portion 5. Since the extended groove 4a is formed, the wall surface on the side close to the sealing electrode 3 in the groove 4a is behind the scattering direction of the scattered metal particles, so that it is not easily contaminated with metal, and the inner side (center) of the groove 4a. Side) can be prevented.

また、溝部4a内には金属蒸気Mによる金属の付着がし難く、溝部4a内も金属で汚損され難い部分となり、表面の絶縁性を確保することができる。
したがって、板状絶縁性部材4の溝部4aよりも内側の表面に金属で汚損されない部分が形成されることで、放電開始電圧の低下を抑えることができる。
また、溝部4aが、板状絶縁性部材4の両面に形成されているので、板状絶縁性部材4の両面で溝部4aによる汚損抑制効果を得ることができる。
さらに、溝部4aが、板状絶縁性部材4の全幅にわたって形成されているので、板状絶縁性部材4の全幅にわたって溝部4aによる汚損抑制効果を得ることができる。
In addition, the metal vapor M hardly adheres to the inside of the groove portion 4a, and the groove portion 4a also becomes a portion that is not easily contaminated with metal, so that insulation of the surface can be ensured.
Therefore, a decrease in the discharge start voltage can be suppressed by forming a portion that is not soiled with metal on the inner surface of the groove 4a of the plate-like insulating member 4.
Moreover, since the groove part 4a is formed in both surfaces of the plate-shaped insulating member 4, the stain | pollution | contamination suppression effect by the groove part 4a can be acquired on both surfaces of the plate-shaped insulating member 4.
Furthermore, since the groove 4 a is formed over the entire width of the plate-like insulating member 4, the effect of suppressing fouling by the groove 4 a can be obtained over the entire width of the plate-like insulating member 4.

次に、本発明に係るサージ防護素子の第2から第5実施形態について、図4及び図5を参照して以下に説明する。なお、以下の各実施形態の説明において、上記実施形態において説明した同一の構成要素には同一の符号を付し、その説明は省略する。   Next, second to fifth embodiments of the surge protection element according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

第2実施形態と第1実施形態との異なる点は、第1実施形態では、溝部4aの断面形状が半円状であるのに対し、第2実施形態のサージ防護素子では、図4の(a)に示すように、板状絶縁性部材24の溝部24aが、V字状の断面形状を有している点である。
また、第3実施形態のサージ防護素子では、図4の(b)に示すように、板状絶縁性部材34の溝部34aが、矩形状の断面形状を有している。
また、第4実施形態のサージ防護素子では、図4の(c)に示すように、板状絶縁性部材44の溝部44aが、表面に対して垂直な壁部と断面円弧状の底面とからなる断面形状を有している。
The difference between the second embodiment and the first embodiment is that the cross-sectional shape of the groove 4a is semicircular in the first embodiment, whereas the surge protection element of the second embodiment is shown in FIG. As shown to a), the groove part 24a of the plate-shaped insulating member 24 is a point which has V-shaped cross-sectional shape.
Moreover, in the surge protection element of 3rd Embodiment, as shown in FIG.4 (b), the groove part 34a of the plate-shaped insulating member 34 has a rectangular cross-sectional shape.
Moreover, in the surge protection element of 4th Embodiment, as shown in FIG.4 (c), the groove part 44a of the plate-shaped insulating member 44 is from the wall part perpendicular | vertical with respect to the surface, and the bottom face of cross-sectional arc shape. It has a cross-sectional shape.

これら第2から第4実施形態のサージ防護素子では、第1実施形態と同様に、端部4bから放電補助部5までの途中に介在している溝部24a,34a,44aにより金属蒸気Mの汚損抑制効果を得ることができる。
なお、これら溝部24a,34a,44aは、深いほど金属蒸気Mの汚損抑制効果を得ることができる。
In the surge protection elements of the second to fourth embodiments, as in the first embodiment, the metal vapor M is contaminated by the grooves 24a, 34a, and 44a interposed in the middle from the end 4b to the discharge auxiliary portion 5. An inhibitory effect can be obtained.
Note that the deeper the groove portions 24a, 34a, and 44a, the greater the effect of suppressing the contamination of the metal vapor M.

次に、第5実施形態と第1実施形態との異なる点は、第1実施形態では、溝部4aが板状絶縁性部材4の各端部4bと放電補助部5との間で1本ずつ形成されているのに対し、第5実施形態のサージ防護素子では、図5に示すように、溝部4aが板状絶縁性部材54の端部4bと放電補助部5との間で板状絶縁性部材54の長さ方向に並んで複数形成されている点である。   Next, the difference between the fifth embodiment and the first embodiment is that, in the first embodiment, one groove portion 4 a is provided between each end portion 4 b of the plate-like insulating member 4 and the discharge auxiliary portion 5. On the other hand, in the surge protection element of the fifth embodiment, as shown in FIG. 5, the groove 4 a has a plate-like insulation between the end 4 b of the plate-like insulating member 54 and the discharge auxiliary portion 5. It is a point that a plurality of the sexual members 54 are formed side by side in the length direction.

すなわち、第5実施形態では、溝部4aが板状絶縁性部材54の各端部4bと放電補助部5との間で2本ずつ形成されている。したがって、溝部4aが、板状絶縁性部材54の一方の面に4本形成され、他方の面に4本形成されている。
このように第5実施形態のサージ防護素子では、溝部4aが、板状絶縁性部材54の端部4bと放電補助部5との間で板状絶縁性部材54の長さ方向に並んで複数形成されているので、複数の溝部4aによって、より高い汚損抑制効果を得ることができる。
That is, in the fifth embodiment, two groove portions 4 a are formed between each end portion 4 b of the plate-like insulating member 54 and the discharge auxiliary portion 5. Therefore, four groove portions 4a are formed on one surface of the plate-like insulating member 54, and four grooves are formed on the other surface.
As described above, in the surge protection element according to the fifth embodiment, a plurality of groove portions 4 a are arranged in the length direction of the plate-like insulating member 54 between the end portion 4 b of the plate-like insulating member 54 and the discharge auxiliary portion 5. Since it is formed, a higher antifouling effect can be obtained by the plurality of grooves 4a.

なお、本発明の技術範囲は上記各実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。   The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1…サージ防護素子、2…絶縁性管、3…封止電極、4,54…板状絶縁性部材、4a…溝部、4b…板状絶縁性部材の端部、5…放電補助部   DESCRIPTION OF SYMBOLS 1 ... Surge protection element, 2 ... Insulating tube, 3 ... Sealing electrode, 4,54 ... Plate-like insulating member, 4a ... Groove part, 4b ... End part of plate-like insulating member, 5 ... Discharge auxiliary part

Claims (4)

絶縁性管と、
前記絶縁性管の両端開口部を閉塞して内部に放電制御ガスを封止する一対の封止電極と、
前記絶縁性管内に収納され両端部が一対の前記封止電極に接触した板状絶縁性部材と、
前記板状絶縁性部材の中央に導電性材料で形成された放電補助部とを備え、
前記板状絶縁性部材が、少なくとも一方の面の端部と前記放電補助部との間に前記絶縁性管の軸線を横切る方向に延在して形成された溝部を有していることを特徴とするサージ防護素子。
An insulating tube;
A pair of sealing electrodes for closing the opening at both ends of the insulating tube and sealing the discharge control gas inside;
A plate-like insulating member housed in the insulating tube and having both ends in contact with the pair of sealing electrodes;
A discharge auxiliary portion formed of a conductive material in the center of the plate-like insulating member,
The plate-like insulating member has a groove formed so as to extend in a direction crossing the axis of the insulating tube between the end of at least one surface and the discharge auxiliary portion. Surge protective element.
請求項1に記載のサージ防護素子において、
前記溝部が、前記板状絶縁性部材の両面に形成されていることを特徴とするサージ防護素子。
The surge protection element according to claim 1,
The surge protection element, wherein the groove is formed on both surfaces of the plate-like insulating member.
請求項1又は2に記載のサージ防護素子において、
前記溝部が、前記板状絶縁性部材の全幅にわたって形成されていることを特徴とするサージ防護素子。
The surge protection element according to claim 1 or 2,
The surge protection element, wherein the groove is formed over the entire width of the plate-like insulating member.
請求項1から3のいずれか一項に記載のサージ防護素子において、
前記溝部が、前記板状絶縁性部材の前記端部と前記放電補助部との間で前記板状絶縁性部材の長さ方向に並んで複数形成されていることを特徴とするサージ防護素子。
In the surge protection element according to any one of claims 1 to 3,
A surge protection element, wherein a plurality of the groove portions are formed side by side in the length direction of the plate-like insulating member between the end portion of the plate-like insulating member and the discharge auxiliary portion.
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