JPS60151903A - Watertight insulated wire and method of producing same - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 く所業上の利用分”野〉 本発明は撚線導体の素線…■隙に外周から水密混第１」
物を充填した水蜜絶縁電線ならびにその製造方法に関す
る。[Detailed Description of the Invention] Field of Industrial Use The present invention is directed to the use of stranded conductor strands...
This invention relates to a honey-insulated electric wire filled with a substance and a method for manufacturing the same.

〈従来技術〉 従来の硬銅撚！ｌｌ線を導体とする架空配電線として、
近年応力腐食割れによる断線を防止するため、硬銅撚線
の素線間隙にその外周から水密混和物を充填してなる水
密絶縁％線が用いられている。上記水蜜混和物としてば
粘度の高いものが、充填後も水密性が充分に保たれ、ま
た取り扱いも容易であるので好寸しいが、その反面、外
周からの充填が容易でないという欠点がある。特に、導
体構成として最もよく用いられる中心素線を１本とする
同心撚りのものでは中心素線をとり巻く第１層の素線相
互間に間隙がないので外部から中心部ま−で水密混和物
を充填することが難かしい。この対策として、たとえば
予め中心素線に水密混和物を被覆しておき、その上に第
１層、第２層を順次撚り合せた後、その外周からさらに
水密混和物を充填することも試みられているが工程が複
雑になるという問題がある。捷だ、他の対策として撚線
導体Ｑ構成面から、内層部の素線径を外層部のそれより
も太くしたり、外層の素線数を少なくして外層、素線相
互曲に間隙が形成されるようにし、水密混和物の充填性
を改善したものも提案されている。<Conventional technology> Conventional hard copper twist! As an overhead distribution line with ll wire as a conductor,
In recent years, in order to prevent wire breakage due to stress corrosion cracking, watertight insulated wires have been used, which are made by filling the gaps between the strands of hard copper strands with a watertight mixture from the outer periphery. As for the above-mentioned water honey mixture, one having a high viscosity is suitable because it maintains sufficient watertightness even after filling and is easy to handle, but on the other hand, it has the disadvantage that it is not easy to fill from the outer periphery. In particular, in the concentrically twisted conductor with a single central strand, which is the most commonly used conductor structure, there is no gap between the strands of the first layer surrounding the central strand, so the conductor can be watertightly mixed from the outside to the center. It is difficult to fill things. As a countermeasure against this, attempts have been made to, for example, coat the central strand with a watertight mixture in advance, lay the first and second layers on top of it in sequence, and then fill the outer periphery with a watertight mixture. However, the problem is that the process becomes complicated. Other countermeasures include making the diameter of the strands in the inner layer thicker than that in the outer layer, or reducing the number of strands in the outer layer to create a gap between the outer layer and the strands. It has also been proposed to improve the filling properties of watertight admixtures.

しかしながらこれらの場合でも外層素線と内層素線とか
点または線接触の状態にあるため接触点または接触点近
傍の微少な間隙まで完全に充填することは水密混和物が
高粘度のとき（は非常に困難であり、このため応力腐食
割れの発生要因が未だ完全に解消されていない。さらに
、従来の水密絶縁電線では一度応力腐食割れによる断線
が起ると該電線が地上に垂れ下がってしまい二次災害を
招来する危険性があり、安全対策上からも充分なものと
は言えなかった。However, even in these cases, the outer layer wire and the inner layer wire are in point or line contact, so it is difficult to completely fill the contact point or the minute gap near the contact point when the watertight mixture has a high viscosity (very high viscosity). For this reason, the causes of stress corrosion cracking have not yet been completely eliminated.Furthermore, with conventional watertight insulated wires, once a wire breaks due to stress corrosion cracking, the wire hangs down to the ground, resulting in secondary damage. There was a risk of inviting a disaster, and it could not be said to be sufficient from a safety standpoint.

く目的〉 本発明は従来のかかる問題点を解決し、水密混和物の充
填性を高め素線間に空隙などか゛残存しないようにして
応力腐食割れが起らないようにするとともに、万一断線
が生じた場合でも安全性が確保されるようにすることを
目的とする。Purpose of the present invention: The present invention solves the conventional problems, improves the filling properties of the watertight mixture, prevents any voids from remaining between the strands, prevents stress corrosion cracking, and prevents stress corrosion cracking in the event of wire breakage. The purpose is to ensure safety even when accidents occur.

く構成〉 以下、不発、明を図面に示す一実施例に基づいて詳細に
説明する。Configuration> Hereinafter, the invention will be described in detail based on an embodiment shown in the drawings.

第１図はこの実施例の水蜜絶縁電線の断面図である。こ
の実施例の水密絶縁電線１は、１本の軟銅素線２からな
る内層４を備え、この内層４の外周に上記軟銅素線２よ
りも細径の硬銅素線６が６本撚り合されてなる外層８が
設けられており、内層４と外層８とは圧縮成形により両
者が面接触するよう成形されている。また撚線導体の素
線間隙は熱可塑性物質を主成分とする水密混和物１ｏで
充填され、さらに、外層８の外周にはでポリエチレンな
どからなる絶縁被覆層１２が設けられている。FIG. 1 is a sectional view of the honeycomb insulated wire of this embodiment. The watertight insulated electric wire 1 of this embodiment includes an inner layer 4 made of one annealed copper wire 2, and six hard copper wires 6 having a diameter smaller than the annealed copper wire 2 are twisted around the outer periphery of the inner layer 4. The inner layer 4 and the outer layer 8 are formed by compression molding so that they are in surface contact with each other. The gaps between the strands of the stranded conductor are filled with a watertight mixture 1o mainly composed of a thermoplastic substance, and an insulating coating layer 12 made of polyethylene or the like is provided around the outer periphery of the outer layer 8.

、上記構成の水密絶縁電線１は次のようにして製造され
る。The watertight insulated electric wire 1 having the above structure is manufactured as follows.

まず第３図に示すように、撚線機２０を適用し、軟銅素
線２からなる内層４の周りにこれよりも細径の硬銅素線
６を燗り合せる。これにより第２図に示すような硬銅素
線６間に間隙を備えた外層８をダイス２２を通して形成
する。このようにして形成された撚線導体を予熱装置２
４で予熱し、次段の水蜜混和物充填装置２６に送り出し
てここで外層８の外周から水密混和物１０を撚線導体の
素線間隙に圧入充填する。この場合、硬銅素線６の間隙
は水密混和物１０の粘度を考慮し存大きさに設定されて
おり、また、各素線２，６が予備加熱されることで水密
混和物１０の粘性が低下するので充填はスムーズに行な
われるが、この段階では外層素線と内層素線とが点また
は線接触の状態にあり点接触または接触線近傍の微少空
隙まで完全”に充填しきれない。このため水密混和物１
０を充填した後、さらに、圧縮ローラ２８を通して撚線
全体を圧縮する。その際内層４は軟銅素線２のため容易
に変形し、その結果、外層８の各硬銅素線６と内層４の
軟銅素線２とが面接触し、素線間隙は減少し、同時に、
水密混和物１０の充填されなかった空隙部分が消滅する
こと（なる。このため、応力腐食割れの起る危険性をほ
とんどなくなる。First, as shown in FIG. 3, a wire twisting machine 20 is applied, and a hard copper wire 6 having a smaller diameter than the soft copper wire 2 is twisted around the inner layer 4 made of the soft copper wire 2. As a result, an outer layer 8 with gaps between the hard copper strands 6 as shown in FIG. 2 is formed through the die 22. The stranded conductor thus formed is heated to a preheating device 2.
4, and sent to the next stage, a water-tight mixture filling device 26, where the water-tight mixture 10 is press-fitted from the outer periphery of the outer layer 8 into the gaps between the strands of the stranded wire conductor. In this case, the gap between the hard copper strands 6 is set to a sufficient size considering the viscosity of the watertight mixture 10, and the viscosity of the watertight mixture 10 is set by preheating each strand 2 and 6. However, at this stage, the outer layer strands and the inner layer strands are in point or line contact, and it is not possible to completely fill the minute voids near the point contact or contact line. For this reason, watertight admixture 1
After filling with zero, the entire stranded wire is further compressed through compression rollers 28. At that time, the inner layer 4 is easily deformed due to the annealed copper strands 2, and as a result, each hard copper strand 6 of the outer layer 8 and the annealed copper strand 2 of the inner layer 4 come into surface contact, the strand gap is reduced, and at the same time ,
The unfilled void portions of the watertight mixture 10 disappear.Therefore, the risk of stress corrosion cracking is almost eliminated.

そして、最後に絶縁被覆層１２を押出成形等によ多形成
する。こうして得られた水密絶縁電線１においては、軟
銅素線２には応力腐食割れが起らないので、万一、外層
８の硬銅素線６が応力腐食割れにより断線するようなこ
とがあっても直ちに電線１全体が断線し瞬時に地上に落
下するそいった危険性もない。Finally, the insulating coating layer 12 is formed by extrusion molding or the like. In the thus obtained watertight insulated wire 1, stress corrosion cracking does not occur in the annealed copper wire 2, so in the unlikely event that the hard copper wire 6 of the outer layer 8 breaks due to stress corrosion cracking. There is also no danger that the entire electric wire 1 will break immediately and fall to the ground instantly.

なお、上記実施例では内層４を１本の軟銅素晴２で構成
した場合について説明したが、これに限定されるもので
はなく、たとえば、第４図に示すように内層４′を複数
の軟銅素線２′とした構成のものやさらには外層力；多
層構成のものにも本発明を広く適用することができる。In the above embodiment, the case where the inner layer 4 is composed of one piece of annealed copper material 2 has been explained, but the invention is not limited to this. For example, as shown in FIG. The present invention can be widely applied to those having a structure in which the wire 2' is used, and furthermore, to those having a multi-layer structure.

〈効果〉 以上のように本発明によれば水蜜混和物の充填後、内外
Ａｒ全体を圧縮するので水密混和物充填の際残存してい
た空隙部分が内層の変形にともなって消滅する。このた
め水蜜混和物の充填性が向上し応力腐食割れによる断線
がほとんど発生しなくなる。また、万一硬銅素線が応力
腐食割れにより断線しても軟銅素線により電線全体の断
線が防止されるので、安全性の高い水蜜絶縁電線が得ら
れるという優れた効果が発揮される。また、緊線相互間
に間隙を備えた外層を形成する方法は、外層を内層の軟
銅素線径より細い線区の硬銅素線によって形成する方法
に限定されるものではなく、内外層とも同径の素線を用
い、外層の素線数を標準の構成より少なくすることによ
り外層素線間に間隙を設ける方法なども含まれる。<Effects> As described above, according to the present invention, after filling with the water-tight mixture, the entire inner and outer Ar is compressed, so that the voids remaining during filling with the water-tight mixture disappear as the inner layer deforms. As a result, the filling properties of the honey-water mixture are improved, and wire breakage due to stress corrosion cracking almost never occurs. In addition, even if the hard copper wire is broken due to stress corrosion cracking, the annealed copper wire prevents the entire wire from breaking, resulting in the excellent effect of obtaining a highly safe water-insulated wire. In addition, the method of forming the outer layer with gaps between the wires is not limited to the method of forming the outer layer with hard copper strands having a wire section smaller than the diameter of the annealed copper strands of the inner layer; This also includes a method of creating a gap between the outer layer wires by using wires of the same diameter and reducing the number of wires in the outer layer than the standard configuration.

【図面の簡単な説明】[Brief explanation of the drawing]

図面は本発明の実施例を示し、第１図は水密絶縁電線の
断面図、第２図は第１図の水密絶縁電線の製造途中の内
・外層の断面図、第３図は水密絶、縁電線の製造装置の
概略断面図、第４図は他の実施例の水密絶縁電線の断面
図である。 １．１′・・水蜜絶縁電線、２，２′・・軟銅素線、４
゜４′・・内層、６，６′・・硬銅素線、８，８′・・
外層、１（１，１０’・・水密混和物。 出　願　人　タック電線株式会社 代　理　人　弁理士岡田和秀The drawings show embodiments of the present invention; FIG. 1 is a sectional view of a watertight insulated wire, FIG. 2 is a sectional view of the inner and outer layers of the watertight insulated wire shown in FIG. 1 during manufacture, and FIG. 3 is a watertight insulated wire; FIG. 4 is a schematic cross-sectional view of an apparatus for manufacturing edge electric wires, and FIG. 4 is a cross-sectional view of a watertight insulated electric wire of another embodiment. 1.1'...Mixture insulated wire, 2,2'...Annealed copper wire, 4
゜4'...Inner layer, 6,6'...Hard copper wire, 8,8'...
Outer layer, 1 (1,10'... watertight mixture. Applicant: TAC Electric Cable Co., Ltd. Agent: Kazuhide Okada, patent attorney)

Claims (1)

【特許請求の範囲】 ｉｌｌ　撚線導体の内層が軟銅素線、外層が硬銅素線か
ら成り前記内層の素線と外層の素線とが圧縮成形により
面接触するように形成され、素線間隙に水蜜混和物が充
填されていることを特徴とする水密絶縁電線。 （２）軟銅素線からなる内層の周りに所定の本数および
線径を有する硬銅素線を撚り合わせてこの硬銅素線相互
間に間隙を有する外層を形成し、外周から水密混オロ物
を圧入充填した後、撚線導体を圧縮して前記軟銅素線と
硬鋼素鯨とを面接触させることにより素線間の空隙をｆ
ｒｊ滅させることを特徴とする水蜜絶縁を線の製造方法
。[Scope of Claims] ill The inner layer of the stranded wire conductor is made of annealed copper strands, and the outer layer is made of hard copper strands, and the strands of the inner layer and the strands of the outer layer are formed in surface contact by compression molding, and the strands are formed by compression molding. A watertight insulated wire characterized in that the gaps are filled with a water honey mixture. (2) Hard copper wires having a predetermined number and wire diameter are twisted around an inner layer made of annealed copper wires to form an outer layer with gaps between the hard copper wires, and a watertight mixed metal wire is formed from the outer periphery. After press-fitting and filling, the stranded conductor is compressed to bring the annealed copper wire and the hard steel wire into surface contact, thereby reducing the gap between the wires.
A method for manufacturing a wire with water honey insulation, which is characterized by annihilation of rj.