JP3745865B2

JP3745865B2 - Compound eggplant

Info

Publication number: JP3745865B2
Application number: JP06077397A
Authority: JP
Inventors: 健一大谷
Original assignee: THE FURUKAW ELECTRIC CO., LTD.
Current assignee: THE FURUKAW ELECTRIC CO., LTD.
Priority date: 1996-03-18
Filing date: 1997-03-14
Publication date: 2006-02-15
Anticipated expiration: 2017-03-14
Also published as: JPH09312109A

Description

【０００１】
【発明の属する技術分野】
本発明は、ＦＲＰ製の絶縁心棒と、該ＦＲＰ製の絶縁心棒の両側に取付けられた端末金具と、前記ＦＲＰ製の絶縁心棒の外周に被覆された有機絶縁材料とからなる複合碍子に関するものである。
【０００２】
【従来の技術】
従来の複合碍子は、図２に示すように、ＦＲＰ製の絶縁心棒１と、該ＦＲＰ製の絶縁心棒１の両端に取付けられた端末金具２Ａ、２Ｂと、前記ＦＲＰ製の絶縁心棒１の外周に被覆された有機絶縁材料３とから構成されている。ＦＲＰ製の絶縁心棒１は、長手方向に一様な剛性を有しており、また端末金具２Ａ、２Ｂは鉄製のものであり、更に有機絶縁材料３としてはシリコーンゴムが使用されており、外周には傘部３Ａが形成されている。
【０００３】
この複合碍子は、軽量であり、耐衝撃力があり、撥水性が高く漏れ電流が流れ難い等の特徴があるので、架空送電線の相間に取付けられる相間スペーサとして、送配電線路の支持碍子として、またはラインポスト碍子、ステーションポスト碍子、電車線路の可動ブラケット用の碍子等として使用されている。
【０００４】
【発明が解決しようとする課題】
上記のように、従来の複合碍子は、端末金具２Ａ、２Ｂ間に、長手方向に一様な剛性を有したＦＲＰ製の絶縁心棒１を配置した構成であり、曲げや座屈に弱いという問題があった。
【０００５】
【課題を解決するための手段】
本発明は、上記課題を解決した複合碍子を提供するもので、その構成は、ＦＲＰ製の絶縁心棒と、該ＦＲＰ製の絶縁心棒の両端に取付けられた端末金具と、前記ＦＲＰ製の絶縁心棒の外周に被覆された有機絶縁材料とからなる複合碍子において、前記ＦＲＰ製の絶縁心棒は、所定長のＦＲＰ製の第１の絶縁心棒であって中空型のものと該ＦＲＰ製の第１の絶縁心棒より縦弾性係数が大きい第２のＦＲＰ製の絶縁心棒であって中実型のものとを長手方向に一体化したものであることを特徴とするものである。
【０００６】
上記のように、ＦＲＰ製の絶縁心棒として、所定長のＦＲＰ製の第１の絶縁心棒と該ＦＲＰ製の第１の絶縁心棒より縦弾性係数が大きい、言い換えると、剛性のある第２の絶縁心棒とを長手方向に一体化した複合心棒を使用することにより、曲げや座屈に弱いＦＲＰ製の絶縁心棒の長さを短くできる。また第２の絶縁心棒はＦＲＰ製の第１の絶縁心棒より剛性があるので、該第２の絶縁心棒がＦＲＰ製の第１の絶縁心棒より先に曲げられたり座屈することがない。このように、曲げや座屈に弱いＦＲＰの長さが短かいことおよび第２の絶縁心棒がＦＲＰ製の第１の絶縁心棒より剛性があることから、曲げや座屈に強い複合碍子を得ることができる。
【０００７】
すなわち複合碍子には、使用状況によって、荷重、曲げ、圧縮等の各種の力が加わる。例えば複合碍子を電車線路の可動ブラケットに使用した場合、複合碍子はいわゆる片持ちはりの状態として使用され、曲げや圧縮等の力が加わる。
【０００８】
本発明のように、絶縁心棒として、所定長のＦＲＰ製の第１の絶縁心棒と該ＦＲＰ製の第１の絶縁心棒より剛性のある第２の絶縁心棒とを長手方向に一体化したものを用いた際の、曲げ力による撓み、圧縮による座屈強度、曲げ強度を検討すると次のようになる。
【０００９】
今、複合碍子への曲げ力が片持ちはりへの荷重として与えられた時、ＦＲＰ製の絶縁心棒に与えられる曲げ力による撓みＶは
Ｖ＝ＷＬ³ ／３ＥＩ（１）式
（但し、Ｗ；荷重、Ｌ；ＦＲＰ製の絶縁心棒の長さ、Ｅ；縦弾性係数、Ｉ；断面２次モーメント）
で与えられる。
【００１０】
また、複合碍子への曲げ力が片持ちはりへの曲げモーメントとして与えられた時、ＦＲＰ製の絶縁心棒に与えられる曲げ力による撓みＶは
Ｖ＝ＭＬ² ／２ＥＩ（２）式
（但し、Ｍ；曲げモーメント、Ｌ；ＦＲＰ製の絶縁心棒の長さ、Ｅ；縦弾性係数、Ｉ；断面２次モーメント）
で与えられる。
【００１１】
ＦＲＰ製の絶縁心棒に与えられる曲げ力による撓みＶは小さい方が良く、上記（１）式および（２）式から明らかなように、ＦＲＰ製の絶縁心棒の長さＬを短くするとＦＲＰ製の絶縁心棒に与えられる曲げ力による撓みＶが小さくなる。
【００１２】
本発明においては、絶縁心棒として、所定長のＦＲＰ製の第１の絶縁心棒と該ＦＲＰ製の第１の絶縁心棒より剛性のある第２の絶縁心棒とを長手方向に一体化したものを用いたので、曲げに関与するのはＦＲＰ製の第１の絶縁心棒のみと見做すことができ、従来のものに比してＦＲＰの絶縁心棒の長さが短くなるので曲げ力による撓みを小さくすることができる。
【００１３】
また、圧縮による座屈強度Ｐは
Ｐ＝ｎπ² ＥＩ／Ｌ² （３）式
（但し、ｎ；座屈係数で片端固定の条件ではｎ＝２、Ｅ；縦弾性係数、Ｉ；断面２次モーメント、Ｌ；ＦＲＰ製の絶縁心棒の長さ）
で与えられる。
【００１４】
圧縮による座屈強度Ｐは大きい方が良く、上記（３）式から明らかなように、ＦＲＰ製の絶縁心棒の長さＬが短くなると、座屈強度は向上する。
【００１５】
本発明においては、絶縁心棒として、所定長のＦＲＰ製の第１の絶縁心棒と該ＦＲＰ製の第１の絶縁心棒より剛性のある第２の絶縁心棒とを長手方向に一体化したものを用いたので、座屈に関与するのはＦＲＰ製の第１の絶縁心棒のみと見做すことができ、従来のものに比してＦＲＰの絶縁心棒の長さが短くなるので座屈強度を向上させることができる。
【００１６】
更に、複合碍子への曲げ力が片持ちはりへの荷重として与えられた時、ＦＲＰ製の絶縁心棒の曲げ強度Ｐは
Ｐ＝σp Ｚ／Ｌ（４）式
（但し、σp ；はりの材料の曲げ強さ、Ｚ；断面係数、Ｌ；ＦＲＰ製の絶縁心棒の長さ）
で与えられる。
【００１７】
ＦＲＰ製の絶縁心棒の曲げ強度は大きい方が望ましく、上記（４）式から明らかなように、ＦＲＰ製の絶縁心棒の長さＬが短くなるとＦＲＰ製の絶縁心棒の曲げ強度は大きくなる。
【００１８】
本発明においては、絶縁心棒として、所定長のＦＲＰ製の第１の絶縁心棒と該ＦＲＰ製の第１の絶縁心棒より剛性のある第２の絶縁心棒とを長手方向に一体化したものを用いたので、曲げに関与するのはＦＲＰ製の第１の絶縁心棒のみと見做すことができ、従来のものに比してＦＲＰの絶縁心棒の曲げ強度は大きくなる。
【００１９】
上記のように、本発明は、絶縁心棒として、所定長のＦＲＰ製の第１の絶縁心棒と該ＦＲＰ製の第１の絶縁心棒より剛性のある第２の絶縁心棒とを長手方向に一体化したものを用いたので、曲げ力による撓みを小さくすることができると共に、圧縮による座屈強度および曲げ強度を向上させることができる。
【００２０】
【発明の実施の形態】
以下、本発明を図面を参照して詳細に説明する。
図１は本発明に係る複合碍子の一実施の形態を示す断面図である。この複合碍子は、ＦＲＰ製の絶縁心棒１と、鉄製の端末金具２Ａ２Ｂと、外周に傘部３Ａが形成されたシリコーンゴム等の有機絶縁材料３とから構成されている点は従来のものと同じであるが、端末金具２Ａ２Ｂ間に配置した絶縁心棒１を、所定長のＦＲＰ製の第１の絶縁心棒１Ａと該ＦＲＰ製の第１の絶縁心棒１Ａより剛性のある第２の心棒１Ｂとを長手方向に一体化した複合心棒１Ｃで構成した点に特徴がある。すなわち、第１の絶縁心棒１Ａと第２の絶縁心棒１Ｂとを同じＦＲＰ製としかつ第１の絶縁心棒１Ａを中空型に構成すると共に第２の絶縁心棒１Ｂを中実型に構成したものである。上記の複合心棒１Ｃは、例えば中実型のＦＲＰの一端側の中心部を所定長除去して中空部を形成し、該中空部の部分を第１の絶縁心棒１Ａとし、中実型の部分を第２の絶縁心棒１Ｂとして形成すればよい。このような複合心棒１Ｃは、第２の絶縁心棒１Ｂが第１の絶縁心棒１Ａより剛性が向上している。
【００２１】
なお本発明で使用するＦＲＰ製の第１の絶縁心棒１Ａの断面形状は丸型でも多角柱型等でもよい。
【００２２】
また、ＦＲＰ製の第１の絶縁心棒１Ａの長さは、複合碍子の長手方向の絶縁を確保できる長さが必要であり、使用箇所等に応じて適宜設計するものである。
【００２３】
また同様に、複合碍子に加わる各種の応力等は複合碍子の使用場所によって異なるので、使用場所に適するように、ＦＲＰ製の第１の絶縁心棒１Ａの長さと第２の絶縁心棒１Ｂの長さ、およびＦＲＰ製の第１の絶縁心棒１Ａの太さと第２の心棒１Ｂの太さ等を適宜設計するものである。
【００２４】
更に、本発明で使用する有機絶縁材料３としては、シリコーンゴムの他にシリコン樹脂、ＥＰＤＭゴム、ＥＶＡ共重合体等が使用できる。このような有機絶縁材料３を複合心棒の周囲に形成する際には両者の接着性を良くするために、複合心棒の表面にシランカップリング剤を主成分とするプライマーによる処理、または金属表面処理の一種であるクロメート処理を施しておくことが好ましい。
【００２５】
更に、本発明で使用する端末金具２Ａ、２Ｂの形状は特に限定するものではなく、任意の形状のものを使用することができる。
【００２６】
【発明の効果】
以上のように、本発明に係る複合碍子は、ＦＲＰ製の絶縁心棒と、該ＦＲＰ製の絶縁心棒の両端に取付けられた端末金具と、前記ＦＲＰ製の絶縁心棒の外周に被覆された有機絶縁材料とからなる複合碍子において、前記ＦＲＰ製の絶縁心棒は、所定長のＦＲＰ製の第１の絶縁心棒であって中空型のものと該ＦＲＰ製の第１の絶縁心棒より縦弾性係数が大きい第２のＦＲＰ製の絶縁心棒であって中実型のものとを長手方向に一体化したものであることを特徴とするものであり、曲げや座屈に弱いＦＲＰ製の絶縁心棒の長さが短かくしかも第２の絶縁心棒がＦＲＰ製の第１の絶縁心棒より剛性があることから、曲げや座屈に強い複合碍子を得ることができる。
【図面の簡単な説明】
【図１】本発明に係る複合碍子の一実施の形態を示す断面図。
【図２】従来の複合碍子の断面図。
【符号の説明】
１ＡＦＲＰ製の第１の絶縁心棒
１ＢＦＲＰ製の第２の絶縁心棒
１Ｃ複合心棒
２Ａ、２Ｂ端末金具
３有機絶縁材料[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a composite insulator comprising an FRP insulating mandrel, end fittings attached to both sides of the FRP insulating mandrel, and an organic insulating material coated on the outer periphery of the FRP insulating mandrel. is there.
[0002]
[Prior art]
As shown in FIG. 2, the conventional composite insulator includes an FRP insulating mandrel 1, end fittings 2A and 2B attached to both ends of the FRP insulating mandrel 1, and an outer periphery of the FRP insulating mandrel 1. And an organic insulating material 3 coated on the substrate. The insulating mandrel 1 made of FRP has uniform rigidity in the longitudinal direction, the terminal fittings 2A and 2B are made of iron, and the organic insulating material 3 is made of silicone rubber. An umbrella portion 3A is formed in the case.
[0003]
This composite insulator has features such as light weight, impact resistance, high water repellency, and leakage current that is difficult to flow, so as an interphase spacer to be installed between phases of overhead power lines, as a support insulator for transmission and distribution lines Or a line post insulator, a station post insulator, an insulator for a movable bracket of a train track, and the like.
[0004]
[Problems to be solved by the invention]
As described above, the conventional composite insulator has a configuration in which the insulating mandrel 1 made of FRP having uniform rigidity in the longitudinal direction is disposed between the end fittings 2A and 2B, and is vulnerable to bending and buckling. was there.
[0005]
[Means for Solving the Problems]
The present invention provides a composite insulator in which the above-mentioned problems are solved, and the structure thereof includes an FRP insulating mandrel, terminal fittings attached to both ends of the FRP insulating mandrel, and the FRP insulating mandrel. In the composite insulator made of an organic insulating material coated on the outer periphery of the FRP, the FRP insulating mandrel is a first insulating mandrel made of FRP having a predetermined length , which is a hollow type and the FRP first mandrel. Ru der which characterized in that the as a solid type and a second FRP made insulating mandrel longitudinal elastic coefficient is larger than the insulating mandrel integral longitudinally.
[0006]
As described above, as the FRP insulator mandrel longitudinal elastic coefficient than the first insulating mandrel and said FRP made of the first insulating mandrel predetermined length made of FRP is large, in other words, a second insulating a rigid By using a composite mandrel in which the mandrel is integrated in the longitudinal direction, the length of the FRP insulating mandrel that is vulnerable to bending and buckling can be shortened. Further, since the second insulating mandrel is more rigid than the FRP first insulating mandrel, the second insulating mandrel is not bent or buckled before the FRP first insulating mandrel. Thus, since the length of the FRP that is vulnerable to bending and buckling is short and the second insulating mandrel is more rigid than the first insulating mandrel made of FRP, a composite insulator that is strong against bending and buckling is obtained. be able to.
[0007]
That is, various forces such as load, bending, and compression are applied to the composite insulator depending on use conditions. For example, when a composite insulator is used as a movable bracket of a train track, the composite insulator is used as a so-called cantilever state, and a force such as bending or compression is applied.
[0008]
As in the present invention, as an insulating mandrel, a material obtained by integrating the second insulating mandrel having rigidity than the first insulating mandrel and said FRP made of the first insulating mandrel predetermined length made of FRP in the longitudinal direction Examination of bending due to bending force, buckling strength due to compression, and bending strength when used is as follows.
[0009]
Now, when the bending force applied to the composite insulator is applied as a load to the cantilever, the bending V due to the bending force applied to the FRP insulating mandrel is V = WL ³ / 3EI (1) (W; Load, L: Length of FRP insulating mandrel, E: Longitudinal elastic modulus, I: Secondary moment of section)
Given in.
[0010]
Further, when the bending force to the composite insulator is given as the bending moment to the cantilever, the bending V due to the bending force given to the FRP insulating mandrel is expressed as V = ML ² / 2EI (2) (where M Bending moment, L: length of FRP insulating mandrel, E: longitudinal elastic modulus, I: secondary moment of section)
Given in.
[0011]
The bending V due to the bending force applied to the FRP insulating mandrel should be small, and as is clear from the equations (1) and (2) above, if the length L of the FRP insulating mandrel is shortened, the FRP The bending V due to the bending force applied to the insulating mandrel is reduced.
[0012]
In the present invention, as the insulating mandrel , a first insulating mandrel made of FRP having a predetermined length and a second insulating mandrel that is more rigid than the first insulating mandrel made of FRP are integrated in the longitudinal direction . since had, to participate in the bend can be regarded only as a first insulating mandrel made of FRP, less deflection due to bending force and the length of the FRP insulator mandrel is shorter than that of conventional can do.
[0013]
Also, the buckling strength P due to compression is P = nπ ² EI / L ² (3) (where n is the buckling coefficient and n = 2 in the condition of being fixed at one end, E is the longitudinal elastic modulus, I is the secondary section) Moment , L: Length of FRP insulation mandrel)
Given in.
[0014]
The buckling strength P due to compression is better, and as is clear from the above equation (3), when the length L of the insulating mandrel made of FRP is shortened, the buckling strength is improved.
[0015]
In the present invention, as the insulating mandrel , a first insulating mandrel made of FRP having a predetermined length and a second insulating mandrel that is more rigid than the first insulating mandrel made of FRP are integrated in the longitudinal direction . since had, improved buckling strength so to participate in the buckling can be regarded only as a first insulating mandrel made of FRP, the length of the FRP insulator mandrel is shorter than that of conventional Can be made.
[0016]
Further, when the bending force to the composite insulator is given as a load to the cantilever beam, the bending strength P of the FRP insulating mandrel is P = σp Z / L (4) where σp is the material of the beam Bending strength, Z: Section modulus, L: Length of FRP insulating mandrel)
Given in.
[0017]
It is desirable that the bending strength of the FRP insulating mandrel is large. As is clear from the above equation (4), when the length L of the FRP insulating mandrel is shortened, the bending strength of the FRP insulating mandrel increases.
[0018]
In the present invention, as the insulating mandrel , a first insulating mandrel made of FRP having a predetermined length and a second insulating mandrel that is more rigid than the first insulating mandrel made of FRP are integrated in the longitudinal direction . since had, to participate in the bend it can be regarded only as a first insulating mandrel made of FRP, flexural strength of the insulating mandrel FRP compared with the conventional increases.
[0019]
As described above, the present invention, as the insulating mandrel, integrating the second insulating mandrel having rigidity than the first insulating mandrel and said FRP made of the first insulating mandrel predetermined length made of FRP in the longitudinal direction Since what was used was used , the bending by bending force can be made small, and the buckling strength and bending strength by compression can be improved.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of a composite insulator according to the present invention. This composite insulator is composed of an insulating mandrel 1 made of FRP, an iron terminal fitting 2A 2B, and an organic insulating material 3 such as silicone rubber having an umbrella 3A formed on the outer periphery. Although the same, the insulating mandrel 1 disposed between the terminal fittings 2A and 2B is replaced with a first insulating mandrel 1A made of FRP having a predetermined length and a second mandrel 1B that is more rigid than the first insulating mandrel 1A made of FRP. Is characterized in that it is composed of a composite mandrel 1C integrated in the longitudinal direction. That is, the first insulating mandrel 1A and the second insulating mandrel 1B are made of the same FRP, the first insulating mandrel 1A is formed in a hollow type, and the second insulating mandrel 1B is formed in a solid type. is there. In the composite mandrel 1C, for example, a central portion on one end side of a solid type FRP is removed by a predetermined length to form a hollow portion, and the portion of the hollow portion is used as a first insulating mandrel 1A. May be formed as the second insulating mandrel 1B. In such a composite mandrel 1C, the second insulating mandrel 1B is more rigid than the first insulating mandrel 1A.
[0021]
The cross-sectional shape of the first insulating mandrel 1A made of FRP used in the present invention may be round or polygonal.
[0022]
Further, the length of the first insulating mandrel 1A made of FRP is required to be long enough to ensure insulation in the longitudinal direction of the composite insulator, and is designed as appropriate depending on the place of use.
[0023]
Similarly, since various stresses applied to the composite insulator vary depending on the place where the composite insulator is used, the length of the first insulating mandrel 1A made of FRP and the length of the second insulator mandrel 1B are suitable for the place of use. The thickness of the first insulating mandrel 1A made of FRP, the thickness of the second mandrel 1B, and the like are appropriately designed.
[0024]
Furthermore, as the organic insulating material 3 used in the present invention, silicon resin, EPDM rubber, EVA copolymer and the like can be used in addition to silicone rubber. When such an organic insulating material 3 is formed around the composite mandrel, the surface of the compound mandrel is treated with a primer mainly composed of a silane coupling agent or a metal surface treatment in order to improve the adhesion between the two. It is preferable to perform a chromate treatment which is a kind of the above.
[0025]
Furthermore, the shape of the terminal fittings 2A and 2B used in the present invention is not particularly limited, and any shape can be used.
[0026]
【The invention's effect】
As described above, the composite insulator according to the present invention includes an FRP insulating mandrel, terminal fittings attached to both ends of the FRP insulating mandrel, and organic insulation coated on the outer periphery of the FRP insulating mandrel. In the composite insulator made of a material, the FRP insulating mandrel is a first insulating mandrel made of FRP having a predetermined length and has a longitudinal elastic modulus larger than that of the hollow type and the first insulating mandrel made of FRP. A second FRP insulating mandrel , which is integrated with a solid type in the longitudinal direction, and is the length of an FRP insulating mandrel that is vulnerable to bending and buckling However, since the second insulating mandrel is more rigid than the FRP first insulating mandrel, it is possible to obtain a composite insulator that is resistant to bending and buckling.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a composite insulator according to the present invention.
FIG. 2 is a sectional view of a conventional composite insulator .
[Explanation of symbols]
1A FRP first insulating mandrel 1B FRP second insulating mandrel 1C Composite mandrel 2A, 2B Terminal fitting 3 Organic insulating material

Claims

In a composite insulator comprising an FRP insulating mandrel, end fittings attached to both ends of the FRP insulating mandrel, and an organic insulating material coated on the outer periphery of the FRP insulating mandrel, the FRP insulation mandrel medium a predetermined length made of FRP first insulating ones mandrel at a in the hollow of the first insulating longitudinal elastic coefficient is larger than the mandrel second insulating mandrel made FRP made the FRP of the real composite insulator, characterized in that is obtained by integrating the of a type in the longitudinal direction.