JP4438330B2

JP4438330B2 - Lightning arrestor

Info

Publication number: JP4438330B2
Application number: JP2003184531A
Authority: JP
Inventors: 俊一成田; 幸哉櫻庭; 静夫水口; 敦志澤田
Original assignee: Meidensha Corp
Current assignee: Meidensha Corp
Priority date: 2003-06-27
Filing date: 2003-06-27
Publication date: 2010-03-24
Anticipated expiration: 2023-06-27
Also published as: JP2005019807A

Description

【０００１】
【発明の属する技術分野】
本発明は、雷サージ等による異常電圧から電気機器等を保護するための避雷器に係り、特に避雷器の特性要素を収納する構造に関するものである。
【０００２】
【従来の技術】
避雷器は、電気的性質の特性要素である酸化亜鉛を主成分とする素子、この素子の上下両端に配置される電極、およびこの電極間に組み込まれる素子を保持するためのＦＲＰ(ガラス繊維強化プラスティック)等に代表される保持部材により構成される素子ユニット部と、素子ユニット部内の空間の充填および外部絶縁を担うポリマー材料(一般にシリコーンゴム等が用いられ、表面漏れ距離を確保するために、ひだ付きの形状が採用される)とから構成される。
【０００３】
前述のように素子ユニット部は、素子がＦＲＰ等の保持部材により保持されてユニット化される。このユニット化の方法としては、ＦＲＰ製のパイプを使用する方法と、ＦＲＰ製の棒、板材(平板、円弧版等)等の部材を使用する方法とが一般的である。
【０００４】
ＦＲＰ製のパイプを使用する方法を以下に説明する。図９に示すように、ＦＲＰ製のパイプ１の内部に素子３を積層し、積層した素子３の上部に皿バネ６を介在させて、素子３の上下両端に一対の電極４、５を配置し、電極４、５とＦＲＰ製のパイプ１とをネジ、接着剤等により固定して素子を保持しユニット化を行う。
【０００５】
また、ＦＲＰ製の棒部材を使用する方法を以下に説明する。図１０に示すように、積層した素子３の上部に皿バネ７を介在させて、素子３の上下両端に一対の電極４、５を配置し、素子３の周りにＦＲＰ製の棒部材１５を複数本配置し、上下の電極４、５に設けた装着穴にＦＲＰ製の棒部材１５を嵌合させて上下の電極４、５とＦＲＰ製の棒部材１５とを一体化し、素子３を保持してユニット化を行う。
【０００６】
なお、避雷器を電気機器側と接地側との間に取り付ける際に、避雷器の上下両端をボルトで締め付けるとねじれの方向に圧力がかかってしまう。また、素子の近くでアークが発生した際には、避雷器内部の圧力が上昇してしまう。これらの圧力により、避雷器にねじれが生じてしまうと電極と素子との密着性が低下し、導電性が低下する可能性がある。この問題を解決するために、ＦＲＰ製の棒部材を引張りの圧力を加えた状態で取り付けて、ＦＲＰ製の棒から電極間を圧縮させる力を作用させ、剛性が高く、圧力に対するねじれが小さい避雷器が開示されている(例えば、特許文献１、特許文献２参照。)。
【０００７】
【特許文献１】
特開２００２−２３１５０９号公報
【０００８】
【特許文献２】
特開２００２−２６０９０５号公報
【０００９】
【発明が解決しようとする課題】
前述のように、ＦＲＰ製の棒部材を使用した場合には、アークの発生等により、避雷器内部の圧力が上昇しＦＲＰ製の棒部材が直接圧力を受けるとともに、部材と接着するシリコーンゴム等からなるポリマー材料の外被部分が膨張することによる圧力も受ける。ＦＲＰ製の棒部材の長さが長くなると剛性が小さくなるので、発生するモーメントが大きくなる。この結果、部材の幅、厚さを増す、または前記のようにＦＲＰ製の棒を引張の圧力をかけた状態で取り付ける等の対策が必要となり、避雷器製造のコストが増大してしまう。
【００１０】
また、ＦＲＰ製のパイプを用いた避雷器は、ＦＲＰ製の棒部材を用いた避雷器に比べて剛性が大きいので、ＦＲＰ製の棒部材を用いた避雷器に比べて避雷器にねじれが生じてしまう等の問題が起こる可能性は低い。しかし、ＦＲＰ製のパイプと電極とを固定する際はネジを用いるのが一般的であり(ＦＲＰ製のパイプと電極との双方にネジ加工を施し、ねじ込み、接着により固定する。または、電極に雌ネジを設け、その雌ネジと対応するＦＲＰ製のパイプの側面に雄ネジ貫通用の孔を設けネジ止めする等。)、このネジを用いた構造は組立作業の自動化が困難であり、量産に適していない。この結果、組立費用が増大し避雷器製造のコストが増大してしまうという問題がある。
【００１１】
本発明はかかる事情に鑑みなされたもので、その目的は、前記課題を解決した避雷器を提供することにある。
【００１２】
【課題を解決するための手段】
そこで、前記課題を解決するための請求項１記載の避雷器は、パイプ部材の内部に非直線性の特性要素(例えば、酸化亜鉛を主成分とする素子など)を積層し、その要素を上下から電極で挟み込み、上下の電極とパイプ部材とを固定してなる避雷器において、前記パイプ部材にスリットを設け、
前記スリットは、パイプ部材の上端と下端とから設け、上端から設けたスリットと下端から設けたスリットのと間にパイプ形状部を残すことを特徴とする。
【００１４】
また、請求項２に記載の避雷器は、前記請求項１において、前記パイプ部材の上端から設けたスリットと下端から設けたスリットとの間に中間のスリットを設けて、前記上端から設けたスリットと前記中間のスリットとの間、および前記下端から設けたスリットと前記中間のスリットとの間にパイプ形状部を残すことを特徴とする。
【００１５】
また、請求項３に記載の避雷器は、前記請求項１又は２において、前記上下の電極に凸部を設け、前記パイプ部材の上部と下部とに凹部を設け、これらの凸部と凹部とを嵌合させて、上下の電極とパイプ部材とを固定することを特徴とする。
【００１６】
また、請求項４に記載の避雷器は、前記請求項１又は２において、前記上下の電極に凹部を設け、前記パイプ部材の上部と下部とに凸部を設け、これらの凹部と凸部とを嵌合させて、上下の電極とパイプ部材とを固定することを特徴とする。
【００１７】
また、請求項５に記載の避雷器は、前記請求項１又は２において、前記上下の電極に凹部を設け、前記パイプ部材の上部と下部とに凹部を設け、これらの凹部とリング状部材とを嵌合させて、上下の電極とパイプ部材とを固定することを特徴とする。
【００１８】
請求項１の避雷器は、スリットを設けたことで圧力を逃がすことができ、パイプ部材の端部の加工、端部を広げること等が容易となり、またスリットから容易にポリマー材料を注入できる。また、パイプ部材により素子部がユニット化されており、棒部材を用いたユニット化に比べて組立が容易である。
【００１９】
また、請求項１の避雷器は、上端から設けたスリットと下端から設けたスリットの間にパイプ形状部を残しているので下記の作用効果がある。
【００２０】
通常の棒部材を使用した場合は両端固定となり、例えば長さＬの棒部材で、Ｗの等分布荷重を受けた場合のモーメントＭは
【００２１】
【数１】

【００２２】
変位Ｄは
【００２３】
【数２】

【００２４】
により表される(Ｅは部材材料のヤング率、Ｉは部材の断面２次モーメントである)。本発明ではパイプ形状部を残すことで、同じ長さの棒部材と比べて、パイプ部材の評価長さが１／２となり、前記数式１からモーメントの値は１／４に、前記数式２から変位の値は１／１６に低減できる。また、曲げモーメントに対し、部材には、曲がり側には圧縮力が、その反対側には引張力が発生する。引張力側は部材が破壊するまで荷重に耐えるが、圧縮側は圧縮力が大きくなるに伴い座屈を生じ、荷重を分担できなくなるため、結果として殆どの曲げ荷重を引張力側で担うことになってしまう。座屈の発生は固定条件が同じであれば部材の長さの２乗に反比例するため、本発明のパイプ部材は棒部材と比べて、評価長さが１／２であるので、棒部材の４倍の荷重まで座屈しない。すなわち圧縮荷重を分担することができ、結果として同じ長さの棒部材と比べて曲げモーメントに対する剛性は大きい。
【００２５】
請求項２の避雷器は、中間のスリットを一または複数設けることで、パイプ形状部を２箇所以上残すことができる。これにより、評価長さを小さくすることができ、パイプ部材の長さが長くスリットの面積が大きいことによる剛性の低下を緩和することができる。
【００２６】
請求項３、４、５の避雷器は、電極とパイプ部材とを嵌合により固定できるので、組立に際してネジを用いる必要が無い。結果として組立が容易で、組立作業の自動化を実現しやすい。
【００２７】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。
【００２８】
図１は本発明の実施の形態に用いる素子ユニット部の断面図である。本発明では、パイプ１(例えば、ＦＲＰ製のパイプ)を用いて素子ユニット部のユニット化を行う。図１に示すように、上下部に複数のスリット２、２aを設けたパイプ１の内部に素子３を積層し、積層した素子３と上部の電極４との間に皿バネ６を介在させて、素子３を上下の電極４、５で挟み込む。図１ではスリット２、２aはそれぞれ４個設けた場合を示す。上下の電極４、５とパイプ１との固定は、図２に示すように、上下の電極４、５の外周に凸部８を設け、パイプ１の上部と下部とに凹部９を設け、これら凸部８と凹部９とを嵌合させることにより行う。また、上下の電極４、５に凹部を設け、パイプ１の上部と下部とに凸部を設けて、これらを嵌合させてもよい。また、図３に示すように、上下の電極４、５とパイプ１の上部と下部とに凹部１０、９を設けて、これらの凹部１０、９とリング部材１１とを嵌合させることもできる。これらの嵌合部に対応するパイプ１の外周部に脱落防止リング１２を取り付けることで、嵌合部の脱落を防ぐことができる。なお、前記パイプ１の素材はＦＲＰに限定されず、前記の機能を有するものであればよい。また、凸部と凹部の形状は、円形状、多角形状など、嵌合を行うことができればよい。なお、曲げ強度仕様、放圧の仕様が厳しい場合はコストアップとなるがネジによる固定も適用できる。
【００２９】
スリット２、２aは図４に示すように、パイプ１の上端と下端とから中心方向に向けて設け、パイプ１の中心部はパイプ形状部１３を残すようにする。図４では、スリット２、２aの数は上部に４つ、下部に４つ、合計８つ設けられているが、これに限定されるものではない。また、図４では、パイプ形状部１３は、スリット２、２aを設けたパイプ部分よりも半径が大きくなっているが、これに限定されず、スリット２、２aを設けたパイプ部分と同じ半径でもよい。また図４では、スリット２、２aの先端は半円弧形状になっているがこれに限定されるものではなく、矩形形状、三角形状などでもよい。
【００３０】
前記のようにスリット２、２aを設けることで、パイプ１の上下両端を容易に広げることができ、前記のように電極４、５とパイプ１とを嵌合により固定しやすくなる。嵌合による組立は、ネジによる組立に比べて作業が容易であり、作業の自動化を実現しやすい。また、素子ユニット部内の空間を充填するためのポリマー材料(シリコーンゴム等)をスリット２、２aから容易に注入することができる。また、スリット２、２aはガス放出部としての機能も果たし、異常電圧の印加等によりパイプ１内の圧力が増大した場合には圧力を逃がすことができ、避雷器の破損を防止することができる。
【００３１】
また、図５に記載の変形例について説明する。図５に示すように、スリット２、２aの面積を大きくし、電極との固定に係る上下両端の面積を大きくしてパイプ１を構成する。スリット２、２aの面積を大きくすることで、パイプ１内の圧力が増大した場合にも容易に圧力を逃がすことができる。また、上下両端の面積を大きくして電極との固定をより強固に行うことで、スリット２、２aの面積増大に伴うパイプ１の強度の低下を補うことができる。
【００３２】
また、図６に記載の変形例について説明する。パイプ１の長さが長い場合には、パイプ１にかかる曲げモーメントの大きさは増大し、前記のようにしてスリット２、２aを設けるとパイプ１の剛性は低下し、避雷器に圧力がかかった場合に曲げ応力、変位が増大する等の問題が生じる。そこで図６に示すように、スリット２と２aとの間に中間のスリット２bを設けることによりパイプ形状部１３を２箇所以上残すことができ、パイプ１の剛性の低下を緩和することができる。なお、中間のスリット２bの数を増やすとパイプ形状部１３の数も増加し、さらにパイプ１の剛性の低下を緩和することができる。
【００３３】
また、図７に記載の変形例について説明する。図７に示すように、パイプ１の上端から設けたスリット２と下端から設けたスリット２aとは、長さ方向に対して同じ直線状に位置してなくとも、得られる効果は前記のものと同じである。
【００３４】
また、図８に本発明の避雷器の構造例を示す。図８に示すように、外周部にスリット２、２aを設けたパイプ１の内部に素子３を積層し、積層した素子３と上部の電極４との間に皿バネ６を介在させて、素子３を上下の電極４、５で挟み込み、上下の電極４、５に凸部を設け、パイプの上部と下部とに凹部を設け、これら凸部と凹部とを嵌合させる。また、ポリマー外被１４は、表面漏れ距離を確保するためにひだ付きの形状にすることができる。
【００３５】
【発明の効果】
以上の説明から明らかなように、本発明は、以下の効果を奏する。
【００３６】
避雷器の組立の自動化が実現でき、避雷器の製造コストを低減できる。
【００３７】
スリットから圧力を逃がすことができ、避雷器の破損を防止できる。
【００３８】
パイプ形状部を残すことで、避雷器の剛性の低下を緩和できる。
【００３９】
パイプ部材を用いることで、棒部材と比べて避雷器の直径を小さくでき、小型軽量化が可能となる。
【図面の簡単な説明】
【図１】本発明の素子ユニット部の断面図
【図２】電極とパイプとの嵌合固定を示す要部拡大図。
【図３】電極とパイプとの嵌合固定を示す要部拡大図。
【図４】スリットを設けたパイプの構成図および矢視図。
【図５】スリットを設けたパイプの構成図および矢視図。
【図６】スリットを設けたパイプの構成図および矢視図。
【図７】スリットを設けたパイプの構成図および矢視図。
【図８】本発明の避雷器の断面図。
【図９】ＦＲＰ製のパイプを用いた避雷器の従来例。
【図１０】ＦＲＰ製の棒を用いた避雷器の従来例。
【符号の説明】
１…パイプ
２、２a、２b…スリット
３…素子
４…上部電極
５…下部電極
６…皿バネ
８…電極の凸部
９…パイプの凹部
１０…電極の凹部
１１…リング部材
１２…脱落防止リング
１３…パイプ形状部
１４…ポリマー外被
１５…棒部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightning arrester for protecting an electrical device or the like from an abnormal voltage caused by a lightning surge or the like, and more particularly to a structure for storing a characteristic element of the lightning arrester.
[0002]
[Prior art]
The lightning arrester is composed of an element mainly composed of zinc oxide, which is a characteristic element of electrical properties, electrodes disposed at upper and lower ends of the element, and FRP (glass fiber reinforced plastic) for holding the element incorporated between the electrodes. ) Etc., and a polymer material (generally silicone rubber etc. is used to fill the space in the element unit and the external insulation, and to secure the surface leakage distance, Is used).
[0003]
As described above, the element unit portion is unitized by holding the element by a holding member such as FRP. As a unitization method, a method using a pipe made of FRP and a method using a member such as an FRP bar, plate material (flat plate, arc plate, etc.) are generally used.
[0004]
A method of using an FRP pipe will be described below. As shown in FIG. 9, the element 3 is laminated inside the FRP pipe 1, and a pair of

electrodes

4, 5 are arranged on the upper and lower ends of the element 3 with a disc spring 6 interposed above the laminated element 3. Then, the

electrodes

4 and 5 and the FRP pipe 1 are fixed with screws, an adhesive, etc., and the element is held and unitized.
[0005]
In addition, a method of using a FRP bar member will be described below. As shown in FIG. 10, a pair of

electrodes

4, 5 are disposed on the upper and lower ends of the element 3 with a disc spring 7 interposed between the stacked elements 3, and a bar member 15 made of FRP is disposed around the element 3. A plurality of FRP bar members 15 are fitted into mounting holes provided in the upper and

lower electrodes

4 and 5 so that the upper and

lower electrodes

4 and 5 and the FRP bar member 15 are integrated to hold the element 3. And unitize.
[0006]
When the lightning arrester is attached between the electrical equipment side and the grounding side, if the upper and lower ends of the lightning arrester are tightened with bolts, pressure is applied in the direction of twisting. Further, when an arc is generated near the element, the pressure inside the lightning arrester increases. If the lightning arrester is twisted by these pressures, the adhesion between the electrode and the element is lowered, and the conductivity may be lowered. In order to solve this problem, an FRP rod member is attached in a state where a tensile pressure is applied, a force is applied to compress the space between the electrodes from the FRP rod, and the lightning arrester is high in rigidity and has little torsion against pressure. (For example, refer to Patent Document 1 and Patent Document 2).
[0007]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-231509
[Patent Document 2]
Japanese Patent Laid-Open No. 2002-260905
[Problems to be solved by the invention]
As described above, when an FRP rod member is used, the pressure inside the lightning arrester rises due to the occurrence of an arc, etc., and the FRP rod member receives direct pressure and from the silicone rubber or the like that adheres to the member. It is also subjected to pressure due to the expansion of the outer jacket portion of the resulting polymer material. When the length of the FRP bar member is increased, the rigidity is reduced, and the generated moment is increased. As a result, it is necessary to take measures such as increasing the width and thickness of the member, or attaching the FRP rod in a state where tension is applied as described above, and the cost of manufacturing the lightning arrester increases.
[0010]
In addition, a lightning arrester using an FRP pipe is more rigid than a lightning arrester using an FRP rod member, and therefore, the lightning arrester is twisted compared to an arrester using an FRP rod member. It is unlikely that a problem will occur. However, when fixing the FRP pipe and the electrode, a screw is generally used (both the FRP pipe and the electrode are threaded, screwed, and fixed by bonding, or fixed to the electrode. A female screw is provided, a hole for penetrating the male screw is provided on the side of the FRP pipe corresponding to the female screw, and the screw is fixed.) The structure using this screw is difficult to automate the assembly work, and mass production Not suitable for. As a result, there is a problem that the assembly cost increases and the cost of manufacturing the lightning arrester increases.
[0011]
This invention is made | formed in view of this situation, The objective is to provide the lightning arrester which solved the said subject.
[0012]
[Means for Solving the Problems]
In view of this, the lightning arrester according to claim 1 for solving the above-mentioned problem is obtained by laminating non-linear characteristic elements (for example, elements mainly composed of zinc oxide) inside the pipe member, and the elements are arranged from above and below. In a lightning arrester sandwiched between electrodes and fixing the upper and lower electrodes and the pipe member, the pipe member is provided with a slit ,
The slit is provided from an upper end and a lower end of the pipe member, and a pipe-shaped portion is left between a slit provided from the upper end and a slit provided from the lower end .
[0014]
Moreover, the lightning arrester of Claim 2 provides the slit provided in the said upper end in the said Claim 1 between the slit provided from the upper end of the said pipe member, and the slit provided from the lower end, and the slit provided from the said upper end. A pipe-shaped portion is left between the intermediate slit and between the slit provided from the lower end and the intermediate slit.
[0015]
A lightning arrester according to a third aspect of the present invention is the lightning arrester according to the first or second aspect , wherein the upper and lower electrodes are provided with convex portions, the pipe member is provided with concave portions, and the convex portions and the concave portions are provided. The upper and lower electrodes and the pipe member are fixed by fitting.
[0016]
According to a fourth aspect of the present invention , in the lightning arrester according to the first or second aspect , the upper and lower electrodes are provided with concave portions, the pipe members are provided with convex portions, and the concave portions and the convex portions are provided. The upper and lower electrodes and the pipe member are fixed by fitting.
[0017]
According to a fifth aspect of the present invention , in the lightning arrester according to the first or second aspect , the upper and lower electrodes are provided with recesses, and the upper and lower portions of the pipe member are provided with recesses. The upper and lower electrodes and the pipe member are fixed by fitting.
[0018]
According to the lightning arrester of the first aspect, it is possible to relieve pressure by providing the slit, it becomes easy to process the end of the pipe member, widen the end, and the like, and the polymer material can be easily injected from the slit. Moreover, the element part is unitized by the pipe member, and assembly is easy compared with unitization using a rod member.
[0019]
Moreover, since the lightning arrester of Claim 1 leaves the pipe-shaped part between the slit provided from the upper end, and the slit provided from the lower end, there exists the following effect.
[0020]
When a normal bar member is used, both ends are fixed. For example, the moment M of a length L bar member subjected to an evenly distributed load of W is
[Expression 1]

[0022]
Displacement D is [0023]
[Expression 2]

[0024]
(E is the Young's modulus of the member material, and I is the second moment of section of the member). In the present invention, by leaving the pipe-shaped portion, the evaluation length of the pipe member becomes ½ compared to the rod member of the same length, the moment value is reduced to ¼ from Equation 1 and from Equation 2 above. The displacement value can be reduced to 1/16. Further, with respect to the bending moment, the member generates a compressive force on the bending side and a tensile force on the opposite side. The tensile force side can withstand the load until the member breaks, but the compression side can buckle as the compressive force increases, making it impossible to share the load. turn into. Since the occurrence of buckling is inversely proportional to the square of the length of the member if the fixing conditions are the same, the evaluation length of the pipe member of the present invention is ½ compared to the rod member. Does not buckle up to 4 times the load. That is, the compressive load can be shared, and as a result, the rigidity with respect to the bending moment is greater than that of the rod member having the same length.
[0025]
The lightning arrester of claim 2 can leave two or more pipe-shaped portions by providing one or more intermediate slits. Thereby, evaluation length can be made small and the fall of the rigidity by the length of a pipe member being long and the area of a slit being large can be relieved.
[0026]
According to the lightning arresters of

claims

3 , 4 , and 5 , since the electrode and the pipe member can be fixed by fitting, it is not necessary to use a screw for assembly. As a result, assembly is easy and automation of assembly work is easy to realize.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0028]
FIG. 1 is a sectional view of an element unit used in the embodiment of the present invention. In the present invention, the element unit unit is unitized using the pipe 1 (for example, an FRP pipe). As shown in FIG. 1, an element 3 is laminated inside a pipe 1 provided with a plurality of

slits

2 and 2a on the upper and lower parts, and a disc spring 6 is interposed between the laminated element 3 and the upper electrode 4. The element 3 is sandwiched between the upper and

lower electrodes

4 and 5. FIG. 1 shows a case where four

slits

2 and 2a are provided. As shown in FIG. 2, the upper and

lower electrodes

4 and 5 and the pipe 1 are fixed by providing convex portions 8 on the outer periphery of the upper and

lower electrodes

4 and 5 and providing concave portions 9 on the upper and lower portions of the pipe 1. This is done by fitting the convex portion 8 and the concave portion 9 together. Alternatively, the upper and

lower electrodes

4 and 5 may be provided with recesses, and the upper and lower portions of the pipe 1 may be provided with protrusions to be fitted. Moreover, as shown in FIG. 3, the recessed parts 10 and 9 can be provided in the upper and

lower electrodes

4 and 5 and the upper part and the lower part of the pipe 1, and these recessed parts 10 and 9 and the ring member 11 can also be fitted. . By attaching the drop prevention ring 12 to the outer peripheral portion of the pipe 1 corresponding to these fitting portions, the fitting portions can be prevented from falling off. The material of the pipe 1 is not limited to FRP, and any material having the above function may be used. Moreover, the shape of a convex part and a recessed part should just be able to fit, such as circular shape and polygonal shape. In addition, when the bending strength specification and the pressure release specification are strict, the cost increases, but fixing with screws can also be applied.
[0029]
As shown in FIG. 4, the

slits

2, 2 a are provided toward the center from the upper end and the lower end of the pipe 1, and the pipe-shaped portion 13 is left at the center of the pipe 1. In FIG. 4, the number of

slits

2, 2 a is four at the top and four at the bottom, for a total of eight, but is not limited to this. In FIG. 4, the pipe-shaped portion 13 has a radius larger than that of the pipe portion provided with the

slits

2 and 2a. However, the present invention is not limited to this, and the pipe shape portion 13 may have the same radius as the pipe portion provided with the

slits

2 and 2a. Good. In FIG. 4, the tips of the

slits

2 and 2a have a semicircular arc shape, but the present invention is not limited to this, and may be a rectangular shape or a triangular shape.
[0030]
By providing the

slits

2 and 2a as described above, the upper and lower ends of the pipe 1 can be easily widened, and the

electrodes

4 and 5 and the pipe 1 can be easily fixed by fitting as described above. The assembly by fitting is easier than the assembly by screws, and it is easy to realize automation of the operation. Further, a polymer material (silicone rubber or the like) for filling the space in the element unit portion can be easily injected from the

slits

2 and 2a. In addition, the

slits

2 and 2a also function as a gas discharge part. When the pressure in the pipe 1 increases due to application of abnormal voltage or the like, the pressure can be released, and the lightning arrester can be prevented from being damaged.
[0031]
Further, a modified example shown in FIG. 5 will be described. As shown in FIG. 5, the area of the

slits

2 and 2a is increased, and the areas of the upper and lower ends related to fixing with the electrodes are increased to constitute the pipe 1. By increasing the area of the

slits

2 and 2a, the pressure can be easily released even when the pressure in the pipe 1 increases. In addition, the strength of the pipe 1 can be compensated for by increasing the area of the

slits

2, 2 a by increasing the area of the upper and lower ends to more firmly fix the electrodes.
[0032]
Further, a modified example shown in FIG. 6 will be described. When the length of the pipe 1 is long, the magnitude of the bending moment applied to the pipe 1 is increased. When the

slits

2 and 2a are provided as described above, the rigidity of the pipe 1 is lowered and the lightning arrester is pressurized. In some cases, problems such as increased bending stress and displacement occur. Therefore, as shown in FIG. 6, two or more pipe-shaped portions 13 can be left by providing an intermediate slit 2 b between the

slits

2 and 2 a, and a reduction in rigidity of the pipe 1 can be mitigated. In addition, when the number of the intermediate slits 2b is increased, the number of the pipe-shaped portions 13 is also increased, and further, the reduction in the rigidity of the pipe 1 can be alleviated.
[0033]
Further, a modified example shown in FIG. 7 will be described. As shown in FIG. 7, even if the slit 2 provided from the upper end of the pipe 1 and the slit 2a provided from the lower end are not located in the same straight line with respect to the length direction, the obtained effect is as described above. The same.
[0034]
Moreover, the structural example of the lightning arrester of this invention is shown in FIG. As shown in FIG. 8, an element 3 is laminated inside a pipe 1 having

slits

2 and 2a provided on the outer periphery, and a disc spring 6 is interposed between the laminated element 3 and the upper electrode 4 to thereby form an element. 3 is sandwiched between upper and

lower electrodes

4 and 5, convex portions are provided on the upper and

lower electrodes

4 and 5, and concave portions are provided at the upper and lower portions of the pipe, and these convex portions and the concave portions are fitted. Also, the polymer jacket 14 can have a pleated shape to ensure a surface leakage distance.
[0035]
【The invention's effect】
As is clear from the above description, the present invention has the following effects.
[0036]
The assembly of the lightning arrester can be automated, and the manufacturing cost of the lightning arrester can be reduced.
[0037]
Pressure can be released from the slit, and damage to the lightning arrester can be prevented.
[0038]
Leaving the pipe-shaped part can alleviate the decrease in the rigidity of the lightning arrester.
[0039]
By using the pipe member, the diameter of the lightning arrester can be made smaller than that of the rod member, and the size and weight can be reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an element unit according to the present invention. FIG.
FIG. 3 is an enlarged view of a main part showing fitting and fixing between an electrode and a pipe.
FIG. 4 is a configuration diagram and an arrow view of a pipe provided with a slit.
FIG. 5 is a configuration diagram and an arrow view of a pipe provided with a slit.
FIG. 6 is a configuration diagram and an arrow view of a pipe provided with a slit.
FIG. 7 is a configuration diagram and an arrow view of a pipe provided with a slit.
FIG. 8 is a cross-sectional view of the lightning arrester of the present invention.
FIG. 9 shows a conventional example of a lightning arrester using an FRP pipe.
FIG. 10 is a conventional example of a lightning arrester using FRP rods.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ...

Pipe

2, 2a, 2b ... Slit 3 ... Element 4 ... Upper electrode 5 ... Lower electrode 6 ... Disc spring 8 ... Electrode convex part 9 ... Pipe concave part 10 ... Electrode concave part 11 ... Ring member 12 ... Drop-off prevention ring 13 ... Pipe-shaped part 14 ... Polymer jacket 15 ... Bar member

Claims

In a lightning arrester in which non-linear characteristic elements are stacked inside the pipe member, the elements are sandwiched by electrodes from above and below, and the upper and lower electrodes and the pipe member are fixed.
A slit is provided in the pipe member ,
The slit is provided from an upper end and a lower end of a pipe member, and a pipe-shaped portion is left between a slit provided from the upper end and a slit provided from the lower end .

An intermediate slit is provided between the slit provided from the upper end of the pipe member and the slit provided from the lower end, between the slit provided from the upper end and the intermediate slit, and the slit provided from the lower end, and The lightning arrester according to claim 1 , wherein a pipe-shaped portion is left between the slit and the intermediate slit.

Protruding portions are provided on the upper and lower electrodes, concave portions are provided on the upper and lower portions of the pipe member, and the upper and lower electrodes and the pipe member are fixed by fitting the convex portions and the concave portions. The lightning arrester according to claim 1 or 2 .

The upper and lower electrodes are provided with concave portions, the pipe members are provided with convex portions at the upper and lower portions, and the concave and convex portions are fitted to fix the upper and lower electrodes and the pipe member. The lightning arrester according to claim 1 or 2 .

The upper and lower electrodes are provided with recesses, the upper and lower portions of the pipe member are provided with recesses, and the recesses and the ring-shaped member are fitted to fix the upper and lower electrodes and the pipe member. The lightning arrester according to claim 1 or 2 .