JPH0132714Y2 - - Google Patents
Info
- Publication number
- JPH0132714Y2 JPH0132714Y2 JP18131284U JP18131284U JPH0132714Y2 JP H0132714 Y2 JPH0132714 Y2 JP H0132714Y2 JP 18131284 U JP18131284 U JP 18131284U JP 18131284 U JP18131284 U JP 18131284U JP H0132714 Y2 JPH0132714 Y2 JP H0132714Y2
- Authority
- JP
- Japan
- Prior art keywords
- resistance element
- discharge
- electrode portion
- surge
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010521 absorption reaction Methods 0.000 claims description 10
- 239000012212 insulator Substances 0.000 claims 1
- 239000000463 material Substances 0.000 description 8
- 239000011521 glass Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は、電圧非直線特性を有する高抵抗体素
子と電極間に形成した放電間隙との複合構造を有
するサージ吸収素子に係り、特に電極構造を改良
することにより、電極のスパツタに起因する上記
電極間の短絡を防止し電流耐量及び繰り返し耐量
を向上させたサージ吸収素子に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a surge absorbing element having a composite structure of a high resistance element having voltage non-linear characteristics and a discharge gap formed between electrodes. The present invention relates to a surge absorbing element whose structure is improved to prevent short circuits between the electrodes due to electrode spatter and to improve current withstand capacity and repeated withstand capacity.
上記サージ吸収素子は、電子回路に加わる過渡
的なサージ電圧や誘導雷等から回路素子を保護す
るため、電子機器等に装着されて使用される。 The above-mentioned surge absorbing element is used by being attached to electronic equipment, etc., in order to protect circuit elements from transient surge voltages applied to electronic circuits, induced lightning, and the like.
従来より、其の種サージ吸収素子としては、電
圧非直線特性を有する高抵抗体素子より成るバリ
スタや放電間隙を気密容器に収容したアレスタが
広く使用されている。ところで、上記両サージ吸
収素子にはそれぞれ一長一短が有り、本出願人
は、その欠点を解消すべく、バリスタとアレスタ
との複合構造を有するサージ吸収素子を提案（特
開昭59−157981）している。
Conventionally, as such surge absorbing elements, varistors made of high resistance elements having non-linear voltage characteristics and arresters in which a discharge gap is housed in an airtight container have been widely used. By the way, both of the above surge absorbing elements have their own merits and demerits, and in order to eliminate these drawbacks, the present applicant has proposed a surge absorbing element having a composite structure of a varistor and an arrester (Japanese Patent Application Laid-Open No. 157981/1983). There is.
上記サージ吸収素子１は、第２図に示す如く、
電圧直線性或いは電圧非直線性特性を具備する高
抵抗体素子２を基体とし、その両端に、放電間隙
３を隔てて相対向させた一対の電極４，４′を接
続して、上記高抵抗体素子２と放電間隙３とを並
列接続し、これを気密容器７中に収容した構造を
有するものである。 As shown in FIG. 2, the surge absorbing element 1 has the following features:
A high resistance element 2 having voltage linearity or voltage nonlinearity characteristics is used as a base, and a pair of electrodes 4, 4' facing each other with a discharge gap 3 in between is connected to both ends of the high resistance element 2, which has voltage linearity or voltage nonlinearity characteristics. It has a structure in which a body element 2 and a discharge gap 3 are connected in parallel and housed in an airtight container 7.
上記サージ吸収素子１の動作としては、電極
４，４′間に、過渡的にサージ電圧が印加された
状態で瞬時に、高抵抗体素子２を通じてサージ電
流が流れ、上記高抵抗体素子２の抵抗値とサージ
電流値との積による電圧降下によつて上記高抵抗
体素子２の両端に制限電圧が現れる。電流量が増
加するに従つて電圧も上昇し、上記制限電圧が上
記電極４，４′間の放電開始電圧を超えると、電
極４，４′間の高抵抗体素子２に近い領域で励起
放電（アーク放電）が生起し、その付勢によつて
瞬時に、電極４，４′間の外側の領域に放電が転
移して大電流を通ずる主放電（アーク放電）が生
成する。従つて、上記サージ吸収素子１は、アレ
スタやバリスタに比べ、サージに対する応答が速
く、しかも大きなサージ電流を吸収し得るという
優れたサージ吸収特性を有するものである。 The operation of the surge absorbing element 1 is such that a surge current instantaneously flows through the high-resistance element 2 while a surge voltage is transiently applied between the electrodes 4 and 4'. A limiting voltage appears across the high resistance element 2 due to a voltage drop due to the product of the resistance value and the surge current value. As the amount of current increases, the voltage also increases, and when the limiting voltage exceeds the discharge starting voltage between the electrodes 4 and 4', an excited discharge occurs in the area close to the high resistance element 2 between the electrodes 4 and 4'. (Arc discharge) occurs, and due to its energization, the discharge instantaneously transfers to the outer region between the electrodes 4 and 4', generating a main discharge (arc discharge) through which a large current flows. Therefore, the surge absorbing element 1 has excellent surge absorbing characteristics, in that it has a faster response to surges and can absorb large surge currents than arresters or varistors.
〔考案が解決しようとする問題点〕
ところが、上述の如く優れた特性を有するサー
ジ吸収素子も、大きなサージが繰り返し印加（例
えば、電流波形８／20μsec、電流値1000A、印加
回数500回以上、印加インターバル10sec）された
場合には、高電界によつて加速されたイオンが電
極の放電面に衝突して、電極の構成物質がスパツ
タ（飛散）される虞れが生じる。このため、上記
スパツタ物質が高抵抗体素子の表面に付着して電
極間の絶縁を劣化させ、更にこれが進行すると短
絡に至り、複合型のサージ吸収素子が本来有する
優れたサージ吸収特性を損なうと共に、またその
寿命を短くする原因ともなる。[Problem to be solved by the invention] However, even the surge absorbing element with excellent characteristics as mentioned above cannot be used when large surges are repeatedly applied (for example, current waveform 8/20μsec, current value 1000A, number of applications 500 times or more). If the interval is 10 seconds), there is a risk that ions accelerated by the high electric field will collide with the discharge surface of the electrode, causing the constituent materials of the electrode to be spattered. For this reason, the spatter substance adheres to the surface of the high-resistance element, deteriorating the insulation between the electrodes, and as this progresses further, it leads to a short circuit, which impairs the excellent surge absorption characteristics inherent to the composite surge absorption element. , and also causes shortening of its lifespan.
その対策としては、電極をスパツタされ難い材
料で構成し、スパツタの発生を防止すれば良いの
であるが、スパツタされ難い材料は融点が高く、
また固くて脆いものがほとんどであるため、製造
加工が困難であるという問題がある。 As a countermeasure for this, it is sufficient to prevent the occurrence of spatter by constructing the electrode with a material that is not easily spattered, but materials that are not easily spattered have a high melting point,
In addition, since most of them are hard and brittle, there is a problem in that they are difficult to manufacture and process.
本考案は、上述の点に鑑み案出されたもので、
サージ吸収に供する電極を製造加工が容易な通常
の電極材料を用いて形成し、電極がある程度スパ
ツタされても電極間に短絡の虞れが生じることな
く、サージ吸収に於ける電流耐量及び繰り返し耐
量に優れ、しかも寿命の長いサージ吸収素子を提
供することを目的とする。 This invention was devised in view of the above points,
The electrodes used for surge absorption are formed using ordinary electrode materials that are easy to manufacture and process, and even if the electrodes are spattered to some extent, there is no risk of short circuit between the electrodes, and the current withstand capacity and repeated withstand capacity in surge absorption are improved. The purpose of the present invention is to provide a surge absorbing element that is excellent in performance and has a long life.
上述の目的は、高抵抗体素子を、電極の放電生
成部分から離して配設することにより達成される
ものであり、従つて本考案のサージ吸収素子は、
気密容器の両端に、それぞれ、内側電極部を有す
る一方の電極及び、放電間隙を隔てて上記内側電
極部を取り囲む外側電極部を有する他方の電極を
配すると共に、上記内側電極部の先端と上記外側
電極部の底部との間に、電圧非直線特性を有する
高抵抗体素子を接続し、更に上記内側電極部の上
記高抵抗体素子近傍に、絶縁被覆を施したことを
特徴とするものである。上記サージ吸収素子は、
サージ吸収による放電が、高抵抗体素子から離れ
た外側電極部の先端部と内側電極部の中途部との
間に生成するため、放電によるスパツタ物質が、
上記高抵抗体素子まで到達することはほとんどな
い。
The above object is achieved by arranging the high resistance element away from the discharge generating part of the electrode. Therefore, the surge absorbing element of the present invention has the following features:
One electrode having an inner electrode portion and the other electrode having an outer electrode portion surrounding the inner electrode portion across a discharge gap are disposed at both ends of the airtight container, and the tip of the inner electrode portion and the above electrode portion are disposed at both ends of the airtight container. A high-resistance element having voltage non-linear characteristics is connected between the bottom of the outer electrode part and an insulating coating is applied to the inner electrode part near the high-resistance element. be. The above surge absorption element is
Because a discharge due to surge absorption is generated between the tip of the outer electrode part away from the high-resistance element and the middle part of the inner electrode part, spatter material due to the discharge is
It almost never reaches the high-resistance element.
また、外側電極部先端を、内側に突出部を有す
る形状と成した場合には、外側電極部先端の放電
生成位置が更に安定する。 Moreover, when the outer electrode portion tip end is formed into a shape having a protruding portion on the inside, the discharge generation position of the outer electrode portion tip end is further stabilized.
以下、図面に基づいて本考案の一実施例を説明
する。
Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図は本考案の一実施例に係るサージ吸収素
子を示す概略断面図である、図に於いてサージ吸
収素子１は、例えばZnO，Fe2O3，SnO3等の電圧
非直線特性を有する高抵抗体素子２の両端に、そ
れぞれ、放電間隙３を隔てて対向配置した一方の
電極４及び他方の電極４′を接続して、上記高抵
抗体素子２と放電間隙３とを並列接続し、また上
記電極４，４′のそれぞれの封止キヤツプ部４ａ，
４a′を、例えばセラミツク（フオルステライト
等）等の絶縁物より成る筒状の外囲筐体５の両端
に嵌着し、低融点ガラス等のガラス系封止部材
６，６′を用いて封着することによつて気密容器
７を形成し、該気密容器７内に、上記電圧非直線
特性を有する高抵抗体素子２及び電極４，４′を、
希ガス等の不活性ガスを主体とした放電ガスと共
に収容した構造と成されている。 FIG . 1 is a schematic cross-sectional view showing a surge absorbing element according to an embodiment of the present invention. The high resistance element 2 and the discharge gap 3 are connected in parallel by connecting one electrode 4 and the other electrode 4' facing each other across the discharge gap 3 to both ends of the high resistance element 2. Also, the sealing cap portions 4a, 4a, 4a, 4a, 4a, 4a, 4a, 4a, 4b,
4a' is fitted onto both ends of a cylindrical outer housing 5 made of an insulating material such as ceramic (forsterite, etc.), and sealed using glass-based sealing members 6, 6' such as low melting point glass. An airtight container 7 is formed by attaching the high resistance element 2 and the electrodes 4, 4' having the above-mentioned voltage non-linear characteristics to the airtight container 7.
It has a structure in which an inert gas such as a rare gas is housed together with a discharge gas.
上記一方の電極４及び他方の電極４′は、それ
ぞれ、封止キヤツプ部４ａ及び４a′に溶接された
内側電極部４ｂ及び外側電極部４b′を有してい
る。上記内側電極部４ｂは円柱状と成されて気密
容器７の略中心軸上に配されており、上記外側電
極部４b′は円筒状と成されて上記内側電極部４ｂ
の周囲に、これと略同心円状に取り囲む如くに配
置されている。また上記外側電極部４b′の底部、
即ち封止キヤツプ部４a′の内面と内側電極部４ｂ
先端との間には、高抵抗体素子２が導電性接着剤
によつて接続されており、上記内側電極部４ｂの
上記高抵抗体素子２の近傍、即ち内側電極部４ｂ
の先端部から外側電極部４b′先端との対向部分よ
り若干先端寄りの中途部にかけての表面に絶縁被
覆８が施されている。更に上記外側電極部４b′の
先端は、内側に突出部の有する形状と成されてお
り、この先端と内側電極部４ｂとの間に放電間隙
３が形成される。尚上記内側電極部４ｂ及び外側
電極部４b′は、共に例えばFeやNi等の製造加工
が容易で放電特性に優れた材料より成り、封止キ
ヤツプ部４ａ，４a′は、外囲筐体５及び封止部材
６，６′と熱膨張率が整合する材料、本例の場合
は、セラミツク及びガラスと整合するFe−Ni合
金、42−６合金或いはFe−Ni−Cr−Ti合金等に
よつて形成されている。 The one electrode 4 and the other electrode 4' have an inner electrode part 4b and an outer electrode part 4b' welded to the sealing cap parts 4a and 4a', respectively. The inner electrode portion 4b has a cylindrical shape and is arranged approximately on the central axis of the airtight container 7, and the outer electrode portion 4b' has a cylindrical shape and is arranged approximately on the central axis of the airtight container 7.
It is arranged around this in a substantially concentric circle. Further, the bottom of the outer electrode portion 4b',
That is, the inner surface of the sealing cap part 4a' and the inner electrode part 4b
A high-resistance element 2 is connected to the tip using a conductive adhesive.
An insulating coating 8 is applied to the surface from the tip of the outer electrode portion 4b' to a midway portion slightly closer to the tip than the portion facing the tip of the outer electrode portion 4b'. Furthermore, the tip of the outer electrode portion 4b' has a shape with a protruding portion on the inside, and a discharge gap 3 is formed between this tip and the inner electrode portion 4b. The inner electrode portion 4b and the outer electrode portion 4b' are both made of a material that is easy to manufacture and has excellent discharge characteristics, such as Fe or Ni. and a material whose coefficient of thermal expansion matches that of the sealing members 6, 6', in this example, Fe-Ni alloy, 42-6 alloy, Fe-Ni-Cr-Ti alloy, etc., which matches ceramic and glass. It is formed as follows.
尚、上記電極４，４′間に接続されている高抵
抗体素子２の放電空間内に露出した表面には、製
造工程中或いは電極４，４′間の放電による高抵
抗体素子２の非直線係数の変動を防止するため、
ビスマスガラス等の脱鉛ガラスを主体とした保護
被膜２ａが形成されている。 Note that the surface of the high-resistance element 2 connected between the electrodes 4 and 4' exposed in the discharge space is exposed to non-contamination of the high-resistance element 2 during the manufacturing process or due to discharge between the electrodes 4 and 4'. To prevent fluctuations in the linear coefficient,
A protective coating 2a is formed mainly of lead-free glass such as bismuth glass.
以上詳述の如く、本考案のサージ吸収素子は、
サージ吸収によつて放電が生成する部分と高抵抗
体素子との位置が十分に離れているため、放電に
よつて電極がスパツタしても、スパツタ物質が高
抵抗体素子へは到達せず、その表面に付着するこ
とがないため、製造加工が容易な材料で電極を形
成しても絶縁劣化を生じる虞れがなく、製造容易
にして、複合型のサージ吸収素子が本来有する優
れた特性を十分発揮し得ると共に、電流耐量及び
繰り返し耐量が向上して長寿命が得られる等種々
の実用的価値を有するものである。
As detailed above, the surge absorption element of the present invention is
Since the position where the discharge is generated by surge absorption and the high-resistance element are sufficiently far apart, even if the electrode sputters due to the discharge, the spattered material will not reach the high-resistance element. Since it does not adhere to the surface, there is no risk of insulation deterioration even if the electrode is made of a material that is easy to manufacture and process. It has various practical values such as improved current withstand capacity and repeated withstand capacity and long life.
第１図は本考案の一実施例の概略断面図、第２
図は従来例の概略断面図である。
１……サージ吸収素子、２……高抵抗体素子、
４，４′……電極、４ｂ……内側電極部、４b′…
…外側電極部、７……気密容器。
Fig. 1 is a schematic sectional view of one embodiment of the present invention;
The figure is a schematic sectional view of a conventional example. 1...Surge absorption element, 2...High resistance element,
4, 4'...electrode, 4b...inner electrode part, 4b'...
...Outer electrode section, 7...Airtight container.
Claims (1)
有する一方の電極及び、放電間隙を隔てて上記
内側電極部を取り囲む外側電極部を有する他方
の電極を配すると共に、上記内側電極部の先端
と上記外側電極部の底部との間に、電圧非直線
特性を有する高抵抗体素子を接続し、更に上記
内側電極部の上記高抵抗体素子近傍に、絶縁被
覆を施したことを特徴とするサージ吸収素子。 (2) 外側電極部の先端が内側に突出部を有する形
状と成されていることを特徴とする実用新案登
録請求の範囲第１項に記載のサージ吸収素子。[Claims for Utility Model Registration] (1) One electrode having an inner electrode portion and the other electrode having an outer electrode portion surrounding the inner electrode portion across a discharge gap are disposed at both ends of an airtight container. At the same time, a high-resistance element having voltage nonlinearity is connected between the tip of the inner electrode part and the bottom of the outer electrode part, and an insulator is further connected near the high-resistance element of the inner electrode part. A surge absorption element characterized by being coated. (2) The surge absorbing element according to claim 1, wherein the tip of the outer electrode portion has a shape with an inner protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18131284U JPH0132714Y2 (en) | 1984-11-29 | 1984-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18131284U JPH0132714Y2 (en) | 1984-11-29 | 1984-11-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6196491U JPS6196491U (en) | 1986-06-20 |
| JPH0132714Y2 true JPH0132714Y2 (en) | 1989-10-05 |
Family
ID=30738864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18131284U Expired JPH0132714Y2 (en) | 1984-11-29 | 1984-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0132714Y2 (en) |
-
1984
- 1984-11-29 JP JP18131284U patent/JPH0132714Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6196491U (en) | 1986-06-20 |
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