JPH06140083A - Covering tube for electric wire connecting part - Google Patents

Abstract

PURPOSE:To install a covering tube easily and speedily on an electric wire connecting part without using a heat source or a core member, and obtain stable and sufficient moisture-proof, electrically insulating and mechanically protective effects. CONSTITUTION:A covering tube 10 is composed of an approximately cylindrical tube member having two end parts, and has a tubular covering part 12 to surround the tail end part of a cable casing adjacent to an exposed electric wire and an overall length part of an electric wire exposed in a cable connecting part. Approximately cylindrical sealing parts 14 coming into contact at least watertightly with the outside surface of the tail end part of the cable casing are formed integrally in the two end parts of the covering part 12. The respective sealing parts 14 have respectively three annular projections 16 arranged protrusively from the inner peripheral surface. The covering tube 10 is composed of a flexible material as a whole, and at least the annular projections 16 are composed of an elastically deformable material. The sealing parts 14 are brough into close contact in an annular shape with the cable casing at least by elastic restoring force of the annular projections 16.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、電線の直線接続部、分
岐接続部、終端接続処理部等の電線接続部に、防湿、電
気的絶縁及び機械的保護処理を施すための、電線接続部
の被覆チューブに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric wire connecting portion for applying moisture proof, electrical insulation and mechanical protection treatment to an electric wire connecting portion such as a straight wire connecting portion, a branch connecting portion, a terminal connecting processing portion and the like. Of coated tubes.

【０００２】[0002]

【従来の技術】従来、ケーブル（被覆電線）の接続部や
端末部を絶縁処理するために、様々な方法が用いられて
いる。最も単純な方法として、接続部で露出された電線
に防水テープを巻付け固着し、接続部に防水性及び電気
絶縁性を付与する方法が行われている。また、接続部を
ゴム又はプラスチック製の管部材で被覆し、管部材の端
部を防水テープで封止してケーブル外被に固定する方法
が知られている。これらの方法は、簡便かつ安価である
が、防水テープの巻付け処理が作業者によって仕上がり
に差を生じ易く、均一かつ安定した処理を施すことが困
難である。また、防水テープの防水機能自体が不充分で
あり、確実な電気絶縁性を得ることができない。2. Description of the Related Art Conventionally, various methods have been used to insulate a connecting portion or a terminal portion of a cable (coated electric wire). As the simplest method, a method has been performed in which a waterproof tape is wrapped around and fixed to an electric wire exposed at a connection portion to give the connection portion waterproofness and electrical insulation. Further, a method is known in which the connecting portion is covered with a pipe member made of rubber or plastic, and the end portion of the pipe member is sealed with a waterproof tape to be fixed to the cable jacket. Although these methods are simple and inexpensive, the winding process of the waterproof tape tends to cause a difference in the finish depending on the operator, and it is difficult to perform the uniform and stable process. Further, the waterproof function itself of the waterproof tape is insufficient, and reliable electrical insulation cannot be obtained.

【０００３】実開平２−３３５３７号公報には、加硫ゴ
ム製のガスケットを用いたケーブル接続箱の気密方法が
開示されている。この方法を電線接続部の被覆に適用す
ると、接続部を被覆する管部材とガスケットとの間の気
密性を確保するために、管部材を硬質材料で形成する必
要があり、したがって架空ケーブルのように、接続部に
可撓性が要求される場合には使用できないことになる。Japanese Utility Model Laid-Open No. 2-35537 discloses a method for hermetically sealing a cable connection box using a gasket made of vulcanized rubber. When this method is applied to the coating of electric wire connection parts, it is necessary to form the pipe member with a hard material in order to ensure the airtightness between the pipe member covering the connection portion and the gasket, and therefore, it is necessary to use the pipe member like aerial cable. In addition, it cannot be used when flexibility is required for the connecting portion.

【０００４】さらに、安定かつ充分な防水性及び電気絶
縁性を接続部に付与するために、予め拡径状態にある管
部材を、接続部を囲繞して配置した後に何らかの手段を
用いて収縮させ、その収縮力によって接続部を密接被覆
する被覆チューブ（以下、収縮チューブという）が知ら
れている（特開平２−１７９２１７号公報、実開昭５８
−１５３５５号公報参照）。この種の収縮チューブに
は、熱収縮性に富む高分子材料からなる管部材を、外部
の熱源を用いて加熱収縮させるものと、永久伸び特性に
優れた高分子材料からなる管部材を、予め筒状のコア部
材によって弾性的に拡径し、接続部への装着時にコア部
材を除去することによって弾性収縮させるものとがあ
る。いずれの収縮チューブも、作業時間の短縮及び仕上
がり状態の安定化が可能であり、管部材がそれ自体の収
縮力によってケーブル外被に密着するので、充分な防水
性及び電気絶縁性を接続部に付与することができる。し
かしながら、前者の熱収縮チューブは、作業時に熱源を
必要とする問題、及び材料並びに加工コストが高くつく
問題を有する。また、後者のコア付弾性収縮チューブ
は、作業現場でのコア部材の廃棄の問題、及び材料並び
に製造コストが高くつく問題を有する。さらに、いずれ
の収縮チューブも非使用時には拡張状態にあるので、運
搬や保管に際して嵩張るという問題がある。Further, in order to impart stable and sufficient waterproofness and electric insulation to the connecting portion, the pipe member which has been expanded in diameter is arranged by surrounding the connecting portion and then contracted by some means. There is known a covering tube (hereinafter referred to as a contracting tube) that closely coats the connecting portion by its contracting force (Japanese Patent Laid-Open No. 2-179217, Shokai 58).
-15355). In this type of shrinkable tube, a tube member made of a polymer material having a high heat shrinkability, which is heated and shrunk by using an external heat source, and a tube member made of a polymer material having an excellent permanent elongation property are previously prepared. In some cases, the diameter is elastically expanded by a tubular core member, and the core member is removed when the core member is attached to the connecting portion to elastically contract. Any shrink tube can shorten the working time and stabilize the finished state, and the tube member adheres to the cable jacket by its own shrinking force, so that sufficient waterproofness and electrical insulation are applied to the connection part. Can be granted. However, the former heat shrink tube has a problem that a heat source is required at the time of working and a problem that the material and the processing cost are high. In addition, the latter elastic shrinkable tube with a core has a problem of discarding the core member at the work site and a problem of high material and manufacturing costs. Further, since all the contraction tubes are in an expanded state when not in use, there is a problem that they are bulky during transportation and storage.

【０００５】[0005]

【発明が解決しようとする課題】上記のように、ケーブ
ルの電線接続部に、充分な防湿、電気的絶縁及び機械的
保護機能を付与することができ、しかも電線接続部の可
撓性を失することのない手段として、収縮チューブが有
効に利用されている。しかしながら、従来の収縮チュー
ブは、熱源の準備やコア部材の廃棄の問題、さらにコス
トの問題を有している。本発明の目的は、熱源やコア部
材を使用することなく、電線接続部に容易かつ迅速に装
着可能であって、安価に製造でき、しかも従来の収縮チ
ューブと同等の防湿、電気的絶縁及び機械的保護効果を
得ることができる電線接続部の被覆チューブを提供する
ことにある。As described above, it is possible to impart sufficient moisture-proof, electrical insulation and mechanical protection functions to the electric wire connecting portion of the cable and lose the flexibility of the electric wire connecting portion. A shrink tube is effectively used as a means to prevent this. However, the conventional shrink tube has problems of preparing a heat source, discarding the core member, and cost. An object of the present invention is that it can be easily and quickly attached to an electric wire connection portion without using a heat source or a core member, can be manufactured at low cost, and has moisture resistance, electrical insulation and mechanical properties equivalent to those of a conventional shrink tube. Another object of the present invention is to provide a covering tube for an electric wire connecting portion that can obtain a protective effect.

【０００６】[0006]

【課題を解決するための手段】上記目的を達成するため
に、本発明は、電線の接続部を囲繞する管部材からなる
被覆チューブであって、管部材は、接続部にて露出した
電線の全長部及び接続部に隣接する電線外被の末端部を
被覆する管状の被覆部と、被覆部の複数の端部の各々に
設けられ、電線外被の外表面に少なくとも水密状に接触
する管状のシール部とを具備し、シール部の各々は、そ
の内周面から突設される少なくとも１つの弾性変形可能
な環状突起を備え、環状突起の弾性復元力によって電線
外被に環状に密接することを特徴とする電線接続部の被
覆チューブを提供する。In order to achieve the above object, the present invention is a covered tube comprising a pipe member surrounding a connecting portion of an electric wire, wherein the pipe member is formed of an electric wire exposed at the connecting portion. A tubular covering portion for covering the end portion of the electric wire casing adjacent to the full length portion and the connecting portion, and a tubular member provided at each of a plurality of end portions of the covering portion and contacting the outer surface of the electric wire casing at least in a watertight manner. Each of the seal portions includes at least one elastically deformable annular protrusion protruding from the inner peripheral surface of the seal portion, and is in close contact with the electric wire jacket in an annular shape by the elastic restoring force of the annular protrusion. A covering tube for an electric wire connecting part is provided.

【０００７】好適な実施態様によれば、上記管部材は、
全体として可撓性材料からなり、かつ少なくとも上記シ
ール部が、永久伸び特性及び圧縮永久歪特性に優れたゴ
ム材料からなる被覆チューブが提供される。また、上記
管部材は一体成形品からなることが好ましい。さらに、
上記管部材を直線管又は分岐管から構成してもよい。According to a preferred embodiment, the tube member is
Provided is a coated tube which is made of a flexible material as a whole, and at least the seal portion is made of a rubber material excellent in permanent elongation and compression set characteristics. Further, it is preferable that the pipe member is an integrally molded product. further,
The pipe member may be a straight pipe or a branched pipe.

【０００８】上記実施態様にて要求される永久伸びは、
ＪＩＳ：Ｋ６３０１に準拠した測定方法（１００℃、２
２時間）により、好ましくは４０％以下、さらに好まし
くは１５％以下である。永久伸びが４０％を超えると、
シール部における水密性が時間の経過とともに劣化する
おそれがあり、他方、１５％以下であれば、屋外使用で
かつ電線接続部の径寸法が大きいといった厳しい条件下
でも、充分なシール効果が得られる。The permanent elongation required in the above embodiment is
Measurement method according to JIS: K6301 (100 ° C, 2
2 hours), preferably 40% or less, more preferably 15% or less. When the permanent elongation exceeds 40%,
The watertightness of the seal part may deteriorate over time. On the other hand, if it is 15% or less, sufficient sealing effect can be obtained even under severe conditions such as outdoor use and large diameter dimension of the wire connection part. .

【０００９】また、上記実施態様にて要求される圧縮永
久歪は、ＪＩＳ：Ｋ６３０１に準拠した測定方法（１０
０℃、２２時間、圧縮率１００％）により、好ましくは
６０％以下、さらに好ましくは１５％以下である。圧縮
永久歪が６０％を超えると、シール部における耐クリー
プ性が乏しくなり、結果として環状突起の弾性復元力が
時間の経過とともに劣化するおそれがある。他方、１５
％以下であれば、永久伸びと同様に、厳しい条件下でも
充分なシール効果が得られる。The compression set required in the above embodiment is measured by a measuring method (10) in accordance with JIS: K6301.
According to 0 ° C., 22 hours, compression rate 100%), it is preferably 60% or less, more preferably 15% or less. If the compression set exceeds 60%, the creep resistance of the seal portion becomes poor, and as a result, the elastic restoring force of the annular projection may deteriorate with the passage of time. On the other hand, 15
If it is at most%, a sufficient sealing effect can be obtained even under severe conditions, as in the case of permanent elongation.

【００１０】[0010]

【作用】シール部の環状突起は、電線を管部材に挿入す
ると、電線外被によって押し拡げられ弾性変形する。し
たがってシール部は、環状突起の弾性復元力によって電
線外被に密接し、環状かつ少なくとも水密状のシールが
得られる。この環状突起が、管部材の複数の端部にそれ
ぞれ少なくとも１つ設けられるので、被覆部によって被
覆された露出電線の全長部及び電線外被の末端部は、充
分な防湿、電気的絶縁及び機械的保護作用を受ける。こ
の作用は、管部材に電線を挿通するだけの簡単な作業に
よって迅速に実現される。また、防水テープ等の補助手
段を必要とせず一部材により構成されるので、安定した
被覆構造が得られる。When the electric wire is inserted into the pipe member, the annular projection of the seal portion is expanded and elastically deformed by the electric wire jacket. Therefore, the seal portion comes into close contact with the electric wire jacket by the elastic restoring force of the annular protrusion, and an annular and at least watertight seal is obtained. Since at least one annular projection is provided at each of the plurality of ends of the pipe member, the entire length of the exposed electric wire covered by the covering and the end of the electric wire sheath are sufficiently moisture-proof, electrically insulating and mechanical. Receive protective action. This action is quickly realized by a simple operation of inserting an electric wire into the pipe member. Further, since it is constituted by one member without requiring auxiliary means such as a waterproof tape, a stable covering structure can be obtained.

【００１１】[0011]

【実施例】以下、添付図面に示した好適な実施例に基づ
き、本発明をさらに詳細に説明する。図１は、本発明の
実施例による電線接続部の被覆チューブ１０の斜視図、
図２は被覆チューブ１０の部分断面側面図である。被覆
チューブ１０は、２つの端部を有する略円筒状の管部材
からなり、主としてケーブルの直線接続部を被覆保護す
る。被覆チューブ１０は、ケーブル接続部にて露出した
電線の全長部及び露出電線に隣接するケーブル外被の末
端部分を囲繞する管状の被覆部１２を備える。被覆部１
２の２つの端部には、ケーブル外被の末端部分の外表面
に少なくとも水密状に接触するシール部１４が形成され
る。各シール部１４は、被覆部１２の延長部分として、
略円筒形状を有して被覆部１２に一体形成される。各シ
ール部１４は、それぞれ３つの環状突起１６を内周面か
ら突設して備える（図２参照）。被覆チューブ１０は、
全体として可撓性材料からなり、かつ少なくとも環状突
起１６が、弾性変形可能な材料からなる。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the preferred embodiments shown in the accompanying drawings. FIG. 1 is a perspective view of a covering tube 10 of an electric wire connecting portion according to an embodiment of the present invention,
FIG. 2 is a partial cross-sectional side view of the covering tube 10. The covering tube 10 is formed of a substantially cylindrical tube member having two ends, and mainly covers and protects the straight connecting portion of the cable. The covering tube 10 includes a tubular covering portion 12 that surrounds the entire length of the electric wire exposed at the cable connecting portion and the end portion of the cable jacket adjacent to the exposed electric wire. Cover 1
The two ends of 2 are provided with a seal 14 which at least contacts the outer surface of the end of the cable jacket in a watertight manner. Each seal part 14 is an extension part of the covering part 12,
It has a substantially cylindrical shape and is integrally formed with the covering portion 12. Each seal portion 14 is provided with three annular protrusions 16 protruding from the inner peripheral surface (see FIG. 2). The covering tube 10 is
It is made of a flexible material as a whole, and at least the annular projection 16 is made of an elastically deformable material.

【００１２】図３を参照すると、ケーブルの直線接続部
では、接続される２本のケーブル１８の、外被２０及び
絶縁体（図示せず）の除去により露出された電線２２
が、コネクタ２４によって相互に接続される。被覆チュ
ーブ１０には、接続に先立って、一端のシール部１４か
ら少なくとも電線２２が延出されるまで、一方のケーブ
ル１８が挿通される。その状態で他方のケーブル１８と
接続した後、被覆チューブ１０を移動して、被覆部１２
が各ケーブル１８の外被２０の末端部分、露出電線２２
及びコネクタ２４を囲繞する作用位置（図３）に配置す
る。Referring to FIG. 3, in the straight cable connecting portion, the electric wire 22 exposed by the removal of the jacket 20 and the insulator (not shown) of the two cables 18 to be connected.
Are connected to each other by the connector 24. Prior to connection, one cable 18 is inserted into the covering tube 10 until at least the electric wire 22 extends from the seal portion 14 at one end. In that state, after connecting with the other cable 18, the covering tube 10 is moved to the covering portion 12
Is the end portion of the jacket 20 of each cable 18, the exposed wire 22
And the connector 24 in the working position (FIG. 3) surrounding the connector.

【００１３】シール部１４の環状突起１６の内径は、装
着されるケーブル１８の外被２０の外径よりも所定寸法
だけ小さく形成される。したがって、ケーブル１８を被
覆チューブ１０に挿入すると、シール部１４、又は少な
くとも環状突起１６が弾性変形（拡張）し、その復元力
（収縮力）によってケーブル１８の外被２０の外面に環
状かつ少なくとも水密状に接触する。The inner diameter of the annular protrusion 16 of the seal portion 14 is smaller than the outer diameter of the outer cover 20 of the cable 18 to be mounted by a predetermined dimension. Therefore, when the cable 18 is inserted into the covering tube 10, the seal portion 14, or at least the annular protrusion 16 elastically deforms (expands), and the restoring force (contracting force) thereof causes an annular and at least watertight seal to the outer surface of the jacket 20 of the cable 18. In contact with each other.

【００１４】シール部１４の弾性復元力（収縮力）の大
きさは、いわゆるシールストレス（％）によって表示さ
れる。本発明では、シール部１４の環状突起１６におい
て５％以上のシールストレスが得られるように設計する
ことにより、充分な防湿絶縁保護効果が得られる。上記
実施例では、シールストレスは次式で示される。 シールストレス＝〔（ケーブル外被２０の外径−非拡径
時の環状突起１６の内径）／非拡径時の環状突起１６の
内径〕×１００The magnitude of the elastic restoring force (contracting force) of the seal portion 14 is indicated by so-called seal stress (%). In the present invention, by designing the annular projection 16 of the seal portion 14 so as to obtain a seal stress of 5% or more, a sufficient moisture-proof insulation protection effect can be obtained. In the above embodiment, the seal stress is expressed by the following equation. Seal stress = [(outer diameter of cable jacket 20-inner diameter of annular projection 16 when not expanded) / inner diameter of annular projection 16 when not expanded] × 100

【００１５】シール部１４の環状突起１６は、確実な防
湿絶縁保護効果を得るために、図示の実施例のように、
各シール部１４において複数個設けることが好ましい。
それにより、接続部への装着後、温度変化等によりケー
ブルの伸縮が生じて、ケーブル外被の末端が被覆チュー
ブ１０の最内部に配置された環状突起１６の外側にずれ
ても、さらに外側の環状突起１６によって接続部は安定
的に防湿絶縁保護される。また、環状突起１６の個数
は、適用ケーブルに印加される電圧によって決まるシー
ル距離（シールに要する長さ）に対応して、適宜設定さ
れる。The annular projection 16 of the seal portion 14 is, as in the illustrated embodiment, to obtain a reliable moisture-proof insulation protection effect.
It is preferable to provide a plurality of each seal portion 14.
As a result, even after the cable is expanded and contracted due to temperature change after the attachment to the connection portion, and the end of the cable jacket is displaced to the outside of the annular projection 16 arranged in the innermost portion of the covering tube 10, the outside of the outside still further outside. The annular projection 16 stably protects the connection portion from moisture and insulation. Further, the number of the annular protrusions 16 is appropriately set in accordance with the sealing distance (length required for sealing) that is determined by the voltage applied to the applicable cable.

【００１６】このように被覆チューブ１０は、従来のコ
ア付弾性収縮チューブと同様の物性によって、ケーブル
接続部に安定かつ充分な防湿、電気的絶縁及び機械的保
護効果を付与するものである。したがって被覆チューブ
１０の材料としては、従来のコア付弾性収縮チューブと
同様の材料が使用でき、具体的にはエチレンプロピレン
ゴム、クロロプレンゴム、ブチルゴム、シリコンゴム等
の、永久伸び特性及び圧縮永久歪特性に優れた軟質ゴム
材料が好ましい。ただし、このような物性は少なくとも
シール部１４が有していれば良く、したがって被覆部１
２を異なる材料、例えばより安価な材料から形成するこ
ともできる。しかしながらこの場合も、ケーブル接続部
に一般的に要求される可撓性を喪失しないように、被覆
部１２を可撓性材料から形成する必要がある。また、当
業者にとって自明であるが、被覆チューブ１０の全体に
おいて、裂け強度、引張り強度、耐候性等に優れる材料
を使用することが好ましい。さらに、部品点数及び作業
工数を削減し、より確実な防湿絶縁保護効果を得るため
に、被覆チューブ１０を例えば金型成形によって一体成
形することが好ましい。As described above, the covering tube 10 imparts stable and sufficient moisture-proof, electrical insulation and mechanical protection effects to the cable connecting portion by the same physical properties as the conventional elastic shrinkable tube with a core. Therefore, as the material of the covering tube 10, the same material as the conventional elastic shrinkable tube with a core can be used. Specifically, permanent elongation characteristics and compression set characteristics such as ethylene propylene rubber, chloroprene rubber, butyl rubber, and silicone rubber can be used. An excellent soft rubber material is preferable. However, it is sufficient that at least the seal portion 14 has such physical properties, and therefore the covering portion 1
It is also possible for 2 to be formed from different materials, for example cheaper materials. However, in this case as well, it is necessary to form the covering portion 12 from a flexible material so as not to lose the flexibility generally required for the cable connection portion. Further, as will be apparent to those skilled in the art, it is preferable to use a material having excellent tear strength, tensile strength, weather resistance and the like for the entire coated tube 10. Furthermore, in order to reduce the number of parts and the number of work steps and to obtain a more reliable moisture-proof insulation protection effect, it is preferable to integrally form the covering tube 10 by, for example, die molding.

【００１７】図３に示すように、ケーブル接続部を囲繞
する作用位置において、被覆部１２の内周面は、外被２
０、電線２２及びコネクタ２４の外周面との間に円筒状
の隙間２６を形成する。したがって被覆チューブ１０
は、環状突起１６の内周面のみによってケーブルに接触
する。このような形状により、被覆チューブ１０にケー
ブル１８を挿通する際の摩擦抵抗が減少し、容易に挿通
できるようになる。あるいはまた、被覆部１２がケーブ
ル接続部を締付けない程度に、隙間２６を低減又は排除
することもできる。As shown in FIG. 3, in the working position surrounding the cable connecting portion, the inner peripheral surface of the covering portion 12 has an outer jacket 2
0, the wire 22 and the outer peripheral surface of the connector 24 form a cylindrical gap 26. Therefore, the covering tube 10
Contacts the cable only by the inner peripheral surface of the annular protrusion 16. With such a shape, the friction resistance when inserting the cable 18 into the coating tube 10 is reduced, and the cable 18 can be easily inserted. Alternatively, the gap 26 can be reduced or eliminated to the extent that the cover 12 does not tighten the cable connection.

【００１８】また、図示の実施例では、被覆部１２はケ
ーブル接続部の可撓性を妨害しないように比較的薄肉に
形成され、シール部１４は充分な弾性復元力を得るため
に比較的厚肉に形成される。しかしながら、本発明によ
る被覆チューブはこのような形状及び寸法に限定される
ものではなく、確実な防湿絶縁保護効果が得られる他の
あらゆる適切な形状及び寸法を有することができる。そ
の場合にも、非使用時にチューブを拡張状態に維持する
必要が無いので、運搬や保管に要するスペースを縮小で
きる。Further, in the illustrated embodiment, the covering portion 12 is formed to be relatively thin so as not to impede the flexibility of the cable connecting portion, and the sealing portion 14 is relatively thick to obtain a sufficient elastic restoring force. Formed in meat. However, the coated tube according to the present invention is not limited to such a shape and size, and may have any other suitable shape and size that provides a reliable moisture-proof insulation protection effect. Even in that case, since it is not necessary to maintain the expanded state of the tube when not in use, the space required for transportation and storage can be reduced.

【００１９】上記実施例では、ケーブルの直線接続部に
適用される被覆チューブ１０を示したが、本発明による
被覆チューブは、分岐接続部や末端接続処理部にも使用
することができる。本発明の他の実施例として、分岐接
続部に適用される被覆チューブ２８を図４に示す。図４
において、図１〜図３に示した実施例と同一又は類似の
構成要素には、同一の符号を付す。Although the coated tube 10 applied to the straight connection portion of the cable is shown in the above-mentioned embodiment, the coated tube according to the present invention can be used for the branch connection portion and the end connection treatment portion. As another embodiment of the present invention, a covering tube 28 applied to a branch connection part is shown in FIG. Figure 4
In FIG. 3, the same or similar components as those of the embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals.

【００２０】本発明の被覆チューブによるケーブル接続
部の防湿絶縁保護効果を、以下の実験の評価結果によっ
てさらに明確にする。実験される被覆チューブは、ＥＰ
ＤＭ（エチレンプロピレンジモノマー）主成分の従来の
コア付弾性収縮チューブ用ゴム材料（ＨＳＲ：High Str
etch EPDM Rubber）から、金型成形によって形成したも
のを使用した。この被覆チューブを、高圧引下線架橋ポ
リエチレン絶縁電線（ＰＤＣ：Pole transformer drop
wire crosslinked polyethylene)の直線接続部に装着し
た。その後、接続部を水没させ、電線と水との間の絶縁
抵抗をＤＣ１０００Ｖの条件で絶縁抵抗計にて測定し、
防水絶縁特性を比較評価した（実験１）。さらに、電線
の端部から、被覆チューブを装着した電線接続部へエア
ー圧を印加し、エアーリーク発生時の圧力を測定して気
密特性を比較評価した（実験２）。The moisture-proof insulation protection effect of the cable connection portion by the coating tube of the present invention will be further clarified by the evaluation results of the following experiments. The coated tube tested is EP
Conventional rubber material with elastic core for DM (ethylene propylene dimonomer) main component (HSR: High Str)
Etching EPDM Rubber) was used by molding. This coated tube is used as a high-voltage draw-down cross-linked polyethylene insulated wire (PDC: Pole transformer drop).
It was attached to the straight line connection part of wire crosslinked polyethylene). After that, the connection part is submerged in water, and the insulation resistance between the electric wire and water is measured with an insulation resistance meter under the condition of DC1000V.
The waterproof insulation characteristics were comparatively evaluated (Experiment 1). Further, air pressure was applied from the end portion of the electric wire to the electric wire connection portion where the covering tube was attached, and the pressure at the time of air leak was measured to compare and evaluate the airtight property (Experiment 2).

【００２１】比較対象の従来技術による被覆処理例とし
て、（１）電線接続部を防水テープによって巻付け被覆
したもの、（２）接続部をプラスチック製の管部材で被
覆し、管部材の両端部を３０mmに亙って防水テープで封
止したもの、及び（３）接続部をコア付弾性収縮チュー
ブによって絶縁処理したもの、にそれぞれ上記の実験１
及び２を行った。評価結果を以下の表１に示す。As an example of the covering treatment according to the prior art for comparison, (1) the electric wire connecting portion is wound and covered with a waterproof tape, (2) the connecting portion is covered with a plastic pipe member, and both end portions of the pipe member are covered. The above Experiment 1 was applied to each of the ones sealed with waterproof tape over 30 mm, and (3) the connection part was insulated with an elastic shrinkable tube with a core.
And 2 were performed. The evaluation results are shown in Table 1 below.

【００２２】[0022]

【表１】 [Table 1]

【００２３】表１から分かるように、本発明による被覆
チューブは、従来例の防水テープ処理及び管部材＋防水
テープ処理に比べて、防水絶縁特性、気密特性共はるか
に良好な結果が得られた。しかもそれらの特性値は、従
来のコア付弾性収縮チューブと略同等であった。したが
って、本発明による被覆チューブは、熱源やコア部材を
使用することなく、電線接続部に容易かつ迅速に装着可
能で、安定かつ充分な防湿絶縁保護効果を得ることがで
きる。As can be seen from Table 1, the coated tube according to the present invention showed much better results in waterproof insulation property and airtight property than the conventional waterproof tape treatment and pipe member + waterproof tape treatment. . Moreover, those characteristic values were almost the same as those of the conventional elastic shrinkable tube with core. Therefore, the coated tube according to the present invention can be easily and quickly attached to the wire connecting portion without using a heat source or a core member, and a stable and sufficient moisture-proof insulation protection effect can be obtained.

【００２４】[0024]

【発明の効果】以上の説明から明らかなように、本発明
によれば、電線接続部に、従来の収縮チューブと略同等
の安定かつ充分な防湿性、電気絶縁性、及び機械的保護
特性が付与される。しかも、熱源やコア部材を使用する
ことなく、電線接続部に挿入するだけの簡単な作業で迅
速に装着可能であり、作業性が向上する。また金型成形
工程のみによって容易に形成できるので、製造コストを
低減できる。さらに、拡張状態を維持する必要がないの
で、非使用時の寸法が小さく、運搬や保管に好都合であ
る。As is apparent from the above description, according to the present invention, the electric wire connecting portion has a stable and sufficient moisture proof property, an electrical insulating property, and a mechanical protective property which are substantially equal to those of the conventional shrink tube. Granted. Moreover, without using a heat source or a core member, it can be quickly mounted by a simple operation of inserting it into the electric wire connecting portion, and workability is improved. In addition, since it can be easily formed only by the mold forming step, the manufacturing cost can be reduced. Further, since it is not necessary to maintain the expanded state, the size when not in use is small, which is convenient for transportation and storage.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例による被覆チューブの斜視図で
ある。FIG. 1 is a perspective view of a coated tube according to an embodiment of the present invention.

【図２】図１の被覆チューブの部分断面側面図である。FIG. 2 is a partial cross-sectional side view of the covering tube of FIG.

【図３】ケーブル接続部に装着した図１の被覆チューブ
の断面図である。FIG. 3 is a cross-sectional view of the sheath tube of FIG. 1 mounted on a cable connecting portion.

【図４】本発明の他の実施例による被覆チューブの断面
図である。FIG. 4 is a sectional view of a covering tube according to another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１０，２８…被覆チューブ １２…被覆部 １４…シール部 １６…環状突起 １８…ケーブル ２０…外被 ２６…隙間 10, 28 ... Covering tube 12 ... Covering portion 14 ... Sealing portion 16 ... Annular protrusion 18 ... Cable 20 ... Outer sheath 26 ... Gap

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 電線の接続部を囲繞する管部材からなる
被覆チューブであって、該管部材は、接続部にて露出し
た電線の全長部及び接続部に隣接する電線外被の末端部
を被覆する管状の被覆部と、該被覆部の複数の端部の各
々に設けられ、前記電線外被の外表面に少なくとも水密
状に接触する管状のシール部とを具備し、該シール部の
各々は、その内周面から突設される少なくとも１つの弾
性変形可能な環状突起を備え、該環状突起の弾性復元力
によって前記電線外被に環状に密接することを特徴とす
る電線接続部の被覆チューブ。1. A covering tube comprising a pipe member surrounding a connecting portion of an electric wire, wherein the pipe member comprises a full-length portion of the electric wire exposed at the connecting portion and an end portion of an electric wire jacket adjacent to the connecting portion. A tubular coating portion for coating, and a tubular sealing portion provided at each of a plurality of end portions of the coating portion and contacting the outer surface of the electric wire jacket at least in a watertight manner, each of the sealing portions being provided. Is provided with at least one elastically deformable annular protrusion protruding from its inner peripheral surface, and is in close annular contact with the electric wire jacket by the elastic restoring force of the annular protrusion. tube. 【請求項２】 前記管部材は、全体として可撓性材料か
らなり、かつ少なくとも前記シール部が、永久伸び特性
及び圧縮永久歪特性に優れたゴム材料からなる請求項１
に記載の電線接続部の被覆チューブ。2. The pipe member as a whole is made of a flexible material, and at least the seal portion is made of a rubber material having excellent permanent elongation characteristics and compression set characteristics.
The covered tube of the electric wire connecting portion described in. 【請求項３】 前記管部材が一体成形品からなる請求項
２に記載の電線接続部の被覆チューブ。3. The covering tube for an electric wire connecting portion according to claim 2, wherein the pipe member is an integrally molded product. 【請求項４】 前記管部材が直線管からなる請求項１〜
３のいずれか１つに記載の電線接続部の被覆チューブ。4. The method according to claim 1, wherein the pipe member is a straight pipe.
3. The covering tube for the electric wire connecting portion according to any one of 3 above. 【請求項５】 前記管部材が分岐管からなる請求項１〜
３のいずれか１つに記載の電線接続部の被覆チューブ。5. The method according to claim 1, wherein the pipe member is a branch pipe.
3. The covering tube for the electric wire connecting portion according to any one of 3 above.