JP2017168197A - Surge protective element - Google Patents

Surge protective element Download PDF

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JP2017168197A
JP2017168197A JP2016049518A JP2016049518A JP2017168197A JP 2017168197 A JP2017168197 A JP 2017168197A JP 2016049518 A JP2016049518 A JP 2016049518A JP 2016049518 A JP2016049518 A JP 2016049518A JP 2017168197 A JP2017168197 A JP 2017168197A
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discharge
pair
discharge auxiliary
enlarged diameter
insulating tube
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JP6691686B2 (en
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田中 芳幸
Yoshiyuki Tanaka
芳幸 田中
次郎 黒柳
Jiro Kuroyanagi
次郎 黒柳
英徳 久保田
Hidenori Kubota
英徳 久保田
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Mitsubishi Materials Corp
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Mitsubishi Materials Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a surge protective element capable of suppressing variations in a break-down voltage by preventing a contact between a discharge auxiliary part and an enlarged diameter portion of a protrusion electrode part.SOLUTION: The surge protective element includes: an insulation tube 2; a pair of sealing electrode 3 which blocks a both-end opening portions of the insulation tube to seal the inside with discharge control gas; and a discharge auxiliary part 4 formed from an ion source material on the inner-peripheral surface of the insulation tube. A pair of sealing electrodes include a pair of flange parts 5 fixed on the both-end opening portions of the insulation tube in a close contact state and a pair of protrusion electrode parts 6 protruding inward from the pair of flange parts and facing each other. On the both-end side of the protrusion electrode, there is provided an enlarged diameter part 6b whose diameter is formed to be larger than a front end portion 6a. The discharge auxiliary part is formed to such a position as to face the enlarged diameter part, and the enlarged diameter part has a recess portion 6c of such a shape that a portion facing the discharge auxiliary part is recessed toward the opposite side to the discharge auxiliary part.SELECTED DRAWING: Figure 1

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接続する部分、電源線、アンテナ或いはCRT、液晶テレビおよびプラズマテレビ等の画像表示駆動回路等、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。   Abnormal voltage (such as lightning surge or static electricity) on the part where electronic devices for communication devices such as telephones, facsimiles, modems, etc. are connected to communication lines, power lines, antennas or image display drive circuits such as CRTs, liquid crystal televisions and plasma televisions. A surge protection element is connected to a portion that is easily subjected to electric shock due to a surge voltage) in order to prevent destruction due to abnormal damage due to thermal damage or ignition of an electronic device or a printed circuit board on which the device is mounted.

従来、例えば特許文献1,2に示すように、一対の封止電極から対向状態に突出した一対の突出電極部を備え、絶縁性管の内周面に放電補助部が形成されたアレスタ型のサージ防護素子が記載されている。通常、このようなサージ防護素子では、炭素材で形成された放電補助部が、絶縁性管の内周面に形成されている。このような放電補助部は、一般的にはグラファイト等の導電性のイオン源材料で形成され、初期放電を助長するためのイオン源となっている。また、このようなサージ防護素子では、絶縁性管と突出電極部との位置決めを行うために、突出電極部の基端側に先端部よりも外径が大きくされた拡径部が設けられている。   Conventionally, as shown in Patent Documents 1 and 2, for example, an arrester type comprising a pair of protruding electrode portions protruding in a facing state from a pair of sealing electrodes, and having a discharge auxiliary portion formed on the inner peripheral surface of the insulating tube A surge protection element is described. Usually, in such a surge protection element, a discharge auxiliary portion made of a carbon material is formed on the inner peripheral surface of the insulating tube. Such a discharge auxiliary portion is generally formed of a conductive ion source material such as graphite and serves as an ion source for promoting initial discharge. Further, in such a surge protection element, in order to position the insulating tube and the protruding electrode portion, an enlarged diameter portion having an outer diameter larger than the distal end portion is provided on the proximal end side of the protruding electrode portion. Yes.

特開平11−354244号公報JP 11-354244 A 特開2001−102148号公報JP 2001-102148 A

上記従来の技術には、以下の課題が残されている。
従来の構造では、放電補助部を突出電極部の拡径部近傍まで延ばした際に、放電補助部が突出電極部の拡径部と干渉すると放電電圧が低下してしまうと共に、直流放電開始電圧がばらついてしまう場合があった。特に、低電圧品を作製する際、放電開始電圧Vsを安定化させるために、絶縁性管の内周面において放電補助部を軸線方向に沿ってできるだけ長く形成する必要があり、その場合、より拡径部と接触し易くなると共に、突出電極部の先端部側との間で安定して放電を開始させることが難しくなる。
The following problems remain in the conventional technology.
In the conventional structure, when the discharge auxiliary part is extended to the vicinity of the enlarged diameter part of the protruding electrode part, if the discharge auxiliary part interferes with the enlarged diameter part of the protruding electrode part, the discharge voltage decreases and the DC discharge start voltage There was a case where it fluctuated. In particular, when producing a low-voltage product, in order to stabilize the discharge start voltage Vs, it is necessary to form the discharge auxiliary portion as long as possible along the axial direction on the inner peripheral surface of the insulating tube. It becomes easy to come into contact with the enlarged diameter portion, and it becomes difficult to start discharge stably with the tip end side of the protruding electrode portion.

本発明は、前述の課題に鑑みてなされたもので、放電補助部と突出電極部の拡径部との接触を防ぎ、放電開始電圧のばらつきを抑制することが可能な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 provides a surge protection element capable of preventing contact between the discharge auxiliary portion and the enlarged diameter portion of the protruding electrode portion and suppressing variation in the discharge start voltage. For the purpose.

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の発明に係るサージ防護素子は、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、前記絶縁性管の内周面にイオン源材料で形成された放電補助部とを備え、一対の前記封止電極が、前記絶縁性管の両端開口部に密着状態に固定されている一対のフランジ部と、一対の前記フランジ部から内方に突出し互いに対向した一対の突出電極部とを有し、前記突出電極部の基端側に、先端部よりも外径が大きく形成された拡径部が設けられ、前記放電補助部が、前記拡径部に対向する位置まで形成され、前記拡径部が、前記放電補助部に対向する部分に前記放電補助部と反対側に向けてえぐられた形状の窪み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 according to the first invention includes an insulating tube, a pair of sealing electrodes that closes both ends of the insulating tube and seals a discharge control gas therein, and the insulating tube. A pair of flange portions, each having a pair of sealing electrodes fixed in close contact with both end openings of the insulating tube, A pair of projecting electrode portions projecting inwardly from the flange portion and facing each other, and on the proximal end side of the projecting electrode portion, a diameter-enlarged portion having a larger outer diameter than the distal end portion is provided, The discharge auxiliary portion is formed up to a position facing the enlarged diameter portion, and the enlarged diameter portion is hollowed in a portion facing the discharge auxiliary portion toward the opposite side of the discharge auxiliary portion. It is characterized by having.

本発明のサージ防護素子では、拡径部が、放電補助部に対向する部分に放電補助部と反対側に向けてえぐられた形状の窪み部を有しているので、窪み部によって拡径部と放電補助部とが離間し、互いの接触が無くなると共に、拡径部と放電補助部との距離が大きくなり、放電補助部が突出電極部の先端部側との間で安定して放電を開始することで、放電開始電圧のばらつきが抑制される。   In the surge protection element of the present invention, the diameter-enlarged portion has a hollow portion of the shape facing away from the discharge auxiliary portion at the portion facing the discharge auxiliary portion, so the diameter-enlarged portion is formed by the hollow portion. And the discharge auxiliary part are spaced apart from each other, and the distance between the enlarged diameter part and the discharge auxiliary part increases, and the discharge auxiliary part stably discharges between the protruding electrode part and the distal end side. By starting, the variation in the discharge start voltage is suppressed.

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、前記窪み部と前記放電補助部との距離が、前記放電補助部と前記先端部との距離よりも大きく設定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、窪み部と放電補助部との距離が、放電補助部と先端部との距離よりも大きく設定されているので、拡径部よりも突出電極部の先端部の方が放電補助部に近くなることで、より安定して放電補助部と先端部との間で放電を開始することができる。
In the surge protection element according to the second invention, in the first invention, the distance between the depression and the discharge auxiliary part is set to be larger than the distance between the discharge auxiliary part and the tip part. Features.
That is, in this surge protection element, the distance between the hollow portion and the discharge auxiliary portion is set to be larger than the distance between the discharge auxiliary portion and the tip portion. Since it becomes close to the discharge auxiliary part, discharge can be started more stably between the discharge auxiliary part and the tip part.

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、前記窪み部が、前記拡径部の基端まで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、窪み部が拡径部の基端まで形成されているので、突出電極部の軸線方向に沿った方向についても放電補助部との距離を大きく取ることができ、放電補助部が軸線方向に沿った方向に多少位置ずれしても接触を防ぐことができる。
A surge protection element according to a third aspect of the present invention is characterized in that, in the first or second aspect, the recess is formed up to a base end of the enlarged diameter portion.
That is, in this surge protection element, since the hollow portion is formed up to the base end of the enlarged diameter portion, the distance from the discharge auxiliary portion can be increased in the direction along the axial direction of the protruding electrode portion. Contact can be prevented even if the auxiliary portion is slightly displaced in the direction along the axial direction.

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、拡径部が、放電補助部に対向する部分に放電補助部と反対側に向けてえぐられた形状の窪み部を有しているので、拡径部と放電補助部との接触が無くなると共に、拡径部と放電補助部との距離が大きくなり、放電補助部が突出電極部の先端部側との間で安定して放電を開始することで、放電開始電圧のばらつきが抑制される。
The present invention has the following effects.
That is, according to the surge protection element according to the present invention, the enlarged diameter portion has a hollow portion that is shaped toward the opposite side of the discharge auxiliary portion in the portion facing the discharge auxiliary portion. The contact between the diameter part and the discharge auxiliary part is eliminated, the distance between the enlarged diameter part and the discharge auxiliary part is increased, and the discharge auxiliary part starts stable discharge between the protruding electrode part and the tip side. Thus, variation in the discharge start voltage is suppressed.

本発明に係るサージ防護素子の第1実施形態を示す軸方向中央の断面図である。It is sectional drawing of the axial center which shows 1st Embodiment of the surge protection element which concerns on this invention. 図1のA−A線矢視断面図である。It is AA arrow sectional drawing of FIG. 本発明に係るサージ防護素子の第2実施形態を示す軸方向中央の断面図である。It is sectional drawing of the center of the axial direction which shows 2nd Embodiment of the surge protection element which concerns on this invention. 図3のB−B線矢視断面図である。FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3.

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及び図2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 and 2. 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の内周面にイオン源材料で形成された放電補助部4とを備えている。
一対の封止電極3は、絶縁性管2の両端開口部に密着状態に固定されている一対のフランジ部5と、一対のフランジ部5から内方に突出し互いに対向した一対の突出電極部6とを有している。
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. A stop electrode 3 and a discharge auxiliary portion 4 formed of an ion source material on the inner peripheral surface of the insulating tube 2 are provided.
The pair of sealing electrodes 3 includes a pair of flange portions 5 fixed in close contact with both end openings of the insulating tube 2 and a pair of protruding electrode portions 6 that protrude inward from the pair of flange portions 5 and face each other. And have.

上記突出電極部6の基端側には、先端部6aよりも外径が大きく形成された拡径部6bが設けられている。すなわち、先端部6aは円柱状に形成され、拡径部6bは先端部6aの外径よりも長径及び短径のどちらも大きな略楕円状に形成されている。
上記拡径部6bは、先端側に向けて外径が漸次小さく形成されたテーパ形状とされている。
On the proximal end side of the protruding electrode portion 6, an enlarged diameter portion 6 b having an outer diameter larger than that of the distal end portion 6 a is provided. That is, the tip portion 6a is formed in a columnar shape, and the enlarged diameter portion 6b is formed in a substantially elliptical shape in which both the major axis and the minor axis are larger than the outer diameter of the tip part 6a.
The said enlarged diameter part 6b is made into the taper shape formed in the outer diameter gradually small toward the front end side.

また、拡径部6bは、その外周面の少なくとも一部が絶縁性管2の内周面に当接可能に形成されており、絶縁性管2と突出電極部6との位置決め機能を有している。すなわち、本実施形態では、拡径部6bの長径方向両端と短径方向両端との少なくとも4カ所で絶縁性管2の内周面に当接している。これにより、突出電極部6と絶縁性管2との軸線が一致するように位置決めされる。   The enlarged diameter portion 6b is formed so that at least a part of the outer peripheral surface thereof can contact the inner peripheral surface of the insulating tube 2, and has a positioning function between the insulating tube 2 and the protruding electrode portion 6. ing. In other words, in the present embodiment, the expanded diameter portion 6b is in contact with the inner peripheral surface of the insulating tube 2 at at least four locations, ie, both ends in the major axis direction and both ends in the minor axis direction. Thereby, it positions so that the axis line of the protruding electrode part 6 and the insulating pipe | tube 2 may correspond.

また、放電補助部4は、拡径部6bに対向する位置まで形成されている。
上記拡径部6bは、放電補助部4に対向する部分に放電補助部4と反対側に向けてえぐられた形状の窪み部6cを有している。
本実施形態では、断面矩形状に形成された絶縁性管2の軸線方向に対する垂直断面において、一対の長辺側の中央にそれぞれ放電補助部4が、軸線方向に沿って直線状に形成されている。これに伴って、拡放電補助部4に対向する部分である拡径部6bの短径方向両端に、それぞれ窪み部6cが形成されている。
Moreover, the discharge auxiliary | assistant part 4 is formed to the position facing the enlarged diameter part 6b.
The said enlarged diameter part 6b has the hollow part 6c of the shape grooved toward the opposite side to the discharge auxiliary part 4 in the part facing the discharge auxiliary part 4. FIG.
In the present embodiment, in the vertical cross section with respect to the axial direction of the insulating tube 2 formed in a rectangular cross section, the discharge auxiliary portions 4 are respectively formed linearly along the axial direction at the center of the pair of long sides. Yes. Along with this, recessed portions 6c are formed at both ends in the minor axis direction of the enlarged diameter portion 6b which is a portion facing the enlarged discharge assisting portion 4, respectively.

上記窪み部6cと放電補助部4との距離は、放電補助部4と先端部6aとの距離よりも大きく設定されている。すなわち、窪み部6cの表面は、放電補助部4に対向した凹曲面とされ、表面のどの位置も放電補助部4との距離が、放電補助部4と先端部6aとの距離よりも大きく設定されている。このため、窪み部6cの一部は、先端部6aの外周面よりも半径方向内方に向けて深くえぐられて形成されている。
また、窪み部6cは、拡径部6bの基端まで形成されている。すなわち、窪み部6cは、フランジ部5まで達している。
The distance between the recessed portion 6c and the discharge auxiliary portion 4 is set to be larger than the distance between the discharge auxiliary portion 4 and the tip portion 6a. That is, the surface of the recessed portion 6c is a concave curved surface facing the discharge assisting portion 4, and the distance between the discharge assisting portion 4 and any position on the surface is set larger than the distance between the discharge assisting portion 4 and the tip end portion 6a. Has been. For this reason, a part of the hollow portion 6c is formed deeper inward in the radial direction than the outer peripheral surface of the tip portion 6a.
Moreover, the hollow part 6c is formed to the base end of the enlarged diameter part 6b. That is, the recessed portion 6 c reaches the flange portion 5.

上記放電補助部4は、導電性材料であって、例えば炭素材で形成されている。
上記絶縁性管2は、例えばアルミナなどの結晶性セラミックス材で形成された角筒状部材である。なお、絶縁性管2は、鉛ガラス等の非晶質管を採用しても構わない。また、円筒状部材の絶縁性管2を採用しても構わない。
The discharge auxiliary portion 4 is a conductive material, and is formed of, for example, a carbon material.
The insulating tube 2 is a rectangular tube member made of a crystalline ceramic material such as alumina. The insulating tube 2 may be an amorphous tube such as lead glass. Moreover, you may employ | adopt the insulating tube 2 of a cylindrical member.

上記封止電極3は、例えば42アロイ(Fe:58wt%、Ni:42wt%)やCu等で構成されている。
封止電極3は、絶縁性管2の両端開口部に導電性融着材(図示略)により加熱処理によって密着状態に固定されている角板状のフランジ部5を有している。このフランジ部5と突出電極部6とは一体に設けられている。
The sealing electrode 3 is made of, for example, 42 alloy (Fe: 58 wt%, Ni: 42 wt%), Cu, or the like.
The sealing electrode 3 has a square plate-like flange portion 5 that is fixed in a close contact state by heat treatment with a conductive adhesive (not shown) at both ends of the insulating tube 2. The flange portion 5 and the protruding electrode portion 6 are provided integrally.

上記導電性融着材は、例えばAgを含むろう材としてAg−Cuろう材で形成されている。
上記絶縁性管2内に封入される放電制御ガスは、不活性ガス等であって、例えばHe,Ar,Ne,Xe,Kr,SF,CO,C,C,CF,H,大気等及び これらの混合ガスが採用される。
The conductive fusing material is formed of, for example, an Ag—Cu brazing material as a brazing material containing Ag.
The discharge control gas sealed in the insulating tube 2 is an inert gas or the like, for example, He, Ar, Ne, Xe, Kr, SF 6 , CO 2 , C 3 F 8 , C 2 F 6 , CF 4 , H 2 , air, etc. and mixed gas thereof are used.

上記突出電極部6の先端部6aの先端面には、封止電極3の材料よりも電子放出特性の高い材料で放電活性層7が形成されている。
上記放電活性層7は、例えばSi,Oを主成分元素とし、Na,Cs,Cのうちの少なくとも一つを含んでいる。この放電活性層7は、例えばケイ酸ナトリウム溶液に炭酸セシウム粉末を加えて前駆体を作製し、この前駆体を封止電極3の表面に塗布した後、前駆体に対してケイ酸ナトリウムが軟化する温度以上かつ炭酸セシウムが融解及び分解する温度以上の温度で熱処理を行うことで作製される。
A discharge active layer 7 is formed of a material having higher electron emission characteristics than the material of the sealing electrode 3 on the distal end surface of the distal end portion 6 a of the protruding electrode portion 6.
The discharge active layer 7 includes, for example, Si and O as main components and includes at least one of Na, Cs, and C. The discharge active layer 7 is prepared, for example, by adding a cesium carbonate powder to a sodium silicate solution and applying the precursor to the surface of the sealing electrode 3. Then, the sodium silicate is softened with respect to the precursor. The heat treatment is performed at a temperature equal to or higher than a temperature at which the cesium carbonate is melted and decomposed.

このサージ防護素子1では、過電圧又は過電流が侵入すると、まず放電補助部4と突出電極部6の先端部6aとの間で優先的に初期放電が行われ、この初期放電をきっかけに、さらに放電が進展して一対のフランジ部5間又は突出電極部6間で放電が行われる。   In this surge protection element 1, when an overvoltage or overcurrent enters, first, initial discharge is preferentially performed between the discharge auxiliary portion 4 and the tip portion 6a of the protruding electrode portion 6, and triggered by this initial discharge, Discharge progresses and discharge is performed between the pair of flange portions 5 or between the protruding electrode portions 6.

このように本実施形態のサージ防護素子1では、拡径部6bが、放電補助部4に対向する部分に放電補助部4と反対側に向けてえぐられた形状の窪み部6cを有しているので、窪み部6cによって拡径部6bと放電補助部4とが離間し、互いの接触が無くなると共に、拡径部6bと放電補助部4との距離が大きくなり、放電補助部4が突出電極部6の先端部6a側との間で安定して放電を開始することで、放電開始電圧のばらつきが抑制される。   As described above, in the surge protection element 1 of the present embodiment, the enlarged diameter portion 6b has the recessed portion 6c of the shape that is grooved toward the opposite side of the discharge auxiliary portion 4 in the portion facing the discharge auxiliary portion 4. As a result, the enlarged diameter portion 6b and the discharge auxiliary portion 4 are separated from each other by the recess 6c, and contact with each other is eliminated, and the distance between the enlarged diameter portion 6b and the discharge auxiliary portion 4 increases, and the discharge auxiliary portion 4 protrudes. By starting discharge stably with the tip portion 6a side of the electrode portion 6, variations in the discharge start voltage are suppressed.

また、窪み部6cと放電補助部4との距離が、放電補助部4と先端部6aとの距離よりも大きく設定されているので、拡径部6bよりも突出電極部6の先端部6aの方が放電補助部4に近くなることで、より安定して放電補助部4と先端部6aとの間で放電を開始することができる。   Moreover, since the distance between the recessed portion 6c and the discharge assisting portion 4 is set to be larger than the distance between the discharge assisting portion 4 and the distal end portion 6a, the distal end portion 6a of the protruding electrode portion 6 is larger than the enlarged diameter portion 6b. By being closer to the discharge auxiliary portion 4, it is possible to start discharge more stably between the discharge auxiliary portion 4 and the tip portion 6a.

さらに、窪み部6cが拡径部6bの基端まで形成されているので、突出電極部6の軸線方向に沿った方向についても放電補助部4との距離を大きく取ることができ、放電補助部4が軸線方向に沿った方向に多少位置ずれしても接触を防ぐことができる。   Furthermore, since the hollow portion 6c is formed up to the base end of the enlarged diameter portion 6b, the distance from the discharge auxiliary portion 4 can be increased in the direction along the axial direction of the protruding electrode portion 6, and the discharge auxiliary portion. Contact can be prevented even if 4 is slightly displaced in the direction along the axial direction.

次に、本発明に係るサージ防護素子の第2実施形態について、図3及び図4を参照して以下に説明する。なお、以下の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, a second embodiment of the surge protection element according to the present invention will be described below with reference to FIGS. Note that, in the following description of the embodiment, the same components 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、窪み部6cが拡径部6bの短径方向両端に形成されているのに対し、第2実施形態のサージ防護素子21では、図3及び図4に示すように、拡径部26bの短径方向端部と長径方向端部との間に窪み部26cが形成されている点である。すなわち、第2実施形態では、一対の放電補助部4が第1実施形態の放電補助部4よりも長径方向にずれて形成されているため、対応する窪み部26cも、第1実施形態の窪み部6cよりも長径方向にずれて配置されている。   The difference between the second embodiment and the first embodiment is that, in the first embodiment, the recess 6c is formed at both ends in the minor axis direction of the enlarged diameter portion 6b, whereas the surge protection of the second embodiment. In the element 21, as shown in FIG.3 and FIG.4, it is the point by which the hollow part 26c is formed between the short-diameter direction edge part and the long-diameter direction edge part of the enlarged diameter part 26b. That is, in the second embodiment, the pair of discharge assisting portions 4 are formed so as to be displaced in the major axis direction from the discharge assisting portion 4 of the first embodiment, so that the corresponding recesses 26c are also the recesses of the first embodiment. The portions 6c are arranged so as to be shifted in the major axis direction.

このように第2実施形態のサージ防護素子21においても、第1実施形態と同様に、突出電極部26の拡径部26bが、放電補助部4に対向する部分に窪み部26cを有しているので、拡径部26bと放電補助部4との接触が無くなると共に、拡径部26bと放電補助部4との距離が大きくなり、放電開始電圧のばらつきが抑制される。   As described above, also in the surge protection element 21 of the second embodiment, the enlarged diameter portion 26b of the protruding electrode portion 26 has the recess portion 26c in the portion facing the discharge assisting portion 4 as in the first embodiment. Therefore, the contact between the enlarged diameter portion 26b and the discharge auxiliary portion 4 is eliminated, the distance between the enlarged diameter portion 26b and the discharge auxiliary portion 4 is increased, and the variation in the discharge start voltage is suppressed.

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。
例えば、第1実施形態では、窪み部を拡径部の短径方向両端に形成し、第2実施形態では、窪み部を短径方向両端から長径方向にずれた位置に形成しているが、窪み部を拡径部の長径方向両端にそれぞれ形成しても構わない。
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.
For example, in the first embodiment, the depressions are formed at both ends of the enlarged diameter part in the minor axis direction, and in the second embodiment, the depressions are formed at positions shifted in the major axis direction from both ends of the minor axis direction. You may form a hollow part in the both ends of the major axis direction of an enlarged diameter part, respectively.

1,21…サージ防護素子、2…絶縁性管、3,23…封止電極、4…放電補助部、5…フランジ部、6…突出電極部、6a…突出電極部の先端部、6b,26b…拡径部、6c,26c…窪み部   DESCRIPTION OF SYMBOLS 1,21 ... Surge protective element, 2 ... Insulating tube, 3,23 ... Sealing electrode, 4 ... Discharge auxiliary | assistant part, 5 ... Flange part, 6 ... Projection electrode part, 6a ... Tip part of a projection electrode part, 6b, 26b ... expanded diameter part, 6c, 26c ... recessed part

Claims (3)

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、
前記絶縁性管の内周面にイオン源材料で形成された放電補助部とを備え、
一対の前記封止電極が、前記絶縁性管の両端開口部に密着状態に固定されている一対のフランジ部と、
一対の前記フランジ部から内方に突出し互いに対向した一対の突出電極部とを有し、
前記突出電極部の基端側に、先端部よりも外径が大きく形成された拡径部が設けられ、
前記放電補助部が、前記拡径部に対向する位置まで形成され、
前記拡径部が、前記放電補助部に対向する部分に前記放電補助部と反対側に向けてえぐられた形状の窪み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 discharge auxiliary portion formed of an ion source material on the inner peripheral surface of the insulating tube;
A pair of sealing electrodes, a pair of flange portions fixed in close contact with both end openings of the insulating tube;
A pair of protruding electrode portions protruding inward from the pair of flange portions and facing each other;
On the base end side of the protruding electrode portion, a diameter-expanded portion formed with an outer diameter larger than the tip portion is provided,
The discharge auxiliary part is formed up to a position facing the enlarged diameter part,
The surge protective element according to claim 1, wherein the enlarged diameter portion has a hollow portion that is shaped toward the opposite side of the discharge assisting portion at a portion facing the discharge assisting portion.
請求項1に記載のサージ防護素子において、
前記窪み部と前記放電補助部との距離が、前記放電補助部と前記先端部との距離よりも大きく設定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,
A surge protection element, wherein a distance between the hollow portion and the discharge auxiliary portion is set to be larger than a distance between the discharge auxiliary portion and the tip portion.
請求項1又は2に記載のサージ防護素子において、
前記窪み部が、前記拡径部の基端まで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 recess is formed up to a base end of the enlarged diameter portion.
JP2016049518A 2016-03-14 2016-03-14 Surge protection element Expired - Fee Related JP6691686B2 (en)

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