JP2760043B2 - Method of forming power cable connection - Google Patents

Method of forming power cable connection

Info

Publication number
JP2760043B2
JP2760043B2 JP1114592A JP11459289A JP2760043B2 JP 2760043 B2 JP2760043 B2 JP 2760043B2 JP 1114592 A JP1114592 A JP 1114592A JP 11459289 A JP11459289 A JP 11459289A JP 2760043 B2 JP2760043 B2 JP 2760043B2
Authority
JP
Japan
Prior art keywords
heat
shrinkable tube
pressure
cable
pressurized
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 - Fee Related
Application number
JP1114592A
Other languages
Japanese (ja)
Other versions
JPH02294211A (en
Inventor
豊 椎葉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Electric Industries Ltd
Original Assignee
Sumitomo Electric Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Electric Industries Ltd filed Critical Sumitomo Electric Industries Ltd
Priority to JP1114592A priority Critical patent/JP2760043B2/en
Publication of JPH02294211A publication Critical patent/JPH02294211A/en
Application granted granted Critical
Publication of JP2760043B2 publication Critical patent/JP2760043B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はゴム・ブラスチック電力ケーブルのモールド
接続部の形成方法に関するものである。
Description: FIELD OF THE INVENTION The present invention relates to a method for forming a molded connection of a rubber plastic power cable.

(従来の技術) 一般にゴム・プラスチック電力ケーブルの接続部はケ
ーブルの導体接続部上に形成した補強絶縁体によって固
められる。そしてこの補強絶縁体は、例えばポリエチレ
ンテープ等の絶縁テープを巻き重ねたものを原形とし、
加圧缶を用いて加熱、加圧してモールド一体化して形成
される。
2. Description of the Related Art Generally, a connection portion of a rubber / plastic power cable is hardened by a reinforcing insulator formed on a conductor connection portion of the cable. And this reinforcing insulator, for example, the original form is wound insulation tape such as polyethylene tape,
It is formed by heating and pressurizing using a pressurized can and integrating into a mold.

第2図は従来のモールド接続部の形成方法の一例の要
部の断面をあらわした説明図である。
FIG. 2 is an explanatory view showing a cross section of a main part of an example of a conventional method for forming a mold connection portion.

ケーブルの導体接続部上には絶縁テープを巻き重ねた
モールド用補強絶縁体(1)が形成され、その上には一
方のケーブル絶縁体(2)から他方のケーブル絶縁体
(2)にわたって、熱収縮チューブ(21)が施される。
この熱収縮チューブ(21)は圧力が全体に一様に及ぶよ
うにするためと、モールド用補強絶縁体(21)を形成す
る絶縁テープの巻回層間に圧力媒体が流入するのを防止
するためのものである。
On the conductor connecting portion of the cable, a reinforcing insulator for molding (1) formed by winding an insulating tape is formed, and a heat insulating material extends from one cable insulator (2) to the other cable insulator (2). A shrink tube (21) is provided.
The heat-shrinkable tube (21) is used to uniformly apply the pressure to the whole and to prevent the pressure medium from flowing between the winding layers of the insulating tape forming the reinforcing insulator for molding (21). belongs to.

その外側には加圧缶(22)を配置し、加圧缶(22)の
内張りの気密袋体(23)の端部と前記熱収縮チューブ
(21)の合せ部を圧力を加えて接着し、シール(24)す
る。
A pressurized can (22) is placed on the outside, and the end of the airtight bag (23) lining the pressurized can (22) and the mating portion of the heat shrinkable tube (21) are bonded by applying pressure. , Seal (24).

このような状態において、加圧缶(22)を外部から加
熱し、加圧缶(22)の圧力ガス注入孔(25)より缶内に
加圧ガスを封入すると共に、熱収縮チューブ(21)の真
空抽気孔(24)から抽気を行ない、モールド用補強絶縁
体(1)をモールド一体化する。(特公昭60−10494号
公報参照) (解決しようとする課題) 上記した従来の接続部形成方法においては、加圧缶
(22)の内張りの気密袋体(23)の端部を、外から加圧
して熱収縮チューブ(21)に接着してシールしているた
め、内圧を受けた場合、その圧力によって気密袋体(2
3)の端部が膨張し、シール部を破壊し易くなる。
In such a state, the pressurized can (22) is heated from the outside, pressurized gas is sealed in the can through the pressurized gas injection hole (25) of the pressurized can (22), and the heat-shrinkable tube (21) Bleeding is performed through the vacuum bleeding hole (24), and the reinforcing insulator for molding (1) is integrated with the mold. (See Japanese Patent Publication No. 60-10494) (Problem to be Solved) In the above-described conventional method of forming a connection portion, the end of the airtight bag (23) lined with the pressurized can (22) is removed from the outside. Since it is pressurized and adhered to the heat-shrinkable tube (21) to seal it, when it is subjected to internal pressure, the pressure causes the airtight bag (2
The end of 3) expands, and the seal is easily broken.

又別の方式として、特公昭60−18113号公報に示され
る接続部の形成方法がある。この方法では加熱加圧容器
の端部と、モールド用補強絶縁体を覆ってケーブル絶縁
体上に施した熱収縮性チューブとの間は0リング状パッ
キングでシールしている。しかし、長い一連のケーブル
の接続部をモールドする場合、上記加熱加圧容器は2分
割構造とせざるを得ないことから0リング状パッキング
はシールが不完全となり易い、という問題点がある。
As another method, there is a method for forming a connection portion disclosed in Japanese Patent Publication No. 60-18113. In this method, an O-ring packing is used to seal between the end of the heating and pressurizing container and the heat-shrinkable tube provided on the cable insulator covering the reinforcing insulator for molding. However, when molding a connection part of a long series of cables, the heating and pressurizing container has to be formed into a two-part structure, so that there is a problem that the O-ring packing tends to be incompletely sealed.

(課題を解決するための手段) 本発明は上述の問題点を解消した電力ケーブル接続部
の形成方法を提供するもので、その特徴は、ケーブルの
導体接続部上にモールド用補強絶縁体を形成した後、一
方のケーブルシース端部から他方のケーブルシース端部
にかけて加圧受用熱収縮チューブで覆い、その外側にヒ
ーターを内蔵した加圧缶を配置し、加圧缶の端部に設け
たフランジ付筒状パッキングの筒状部と前記加圧受用熱
収縮チューブに跨ってシール用熱収縮用チューブを施
し、このシール用熱収縮用チューブとフランジ付筒状パ
ッキングの筒状部との合せ部及び加圧受用熱収縮チュー
ブとシール用熱収縮チューブとの合せ部に粘着剤付テー
プを巻回してシールし、前記加圧缶内に加圧ガスを封入
し、加圧及び加熱することにある。
(Means for Solving the Problems) The present invention provides a method for forming a power cable connection portion which solves the above-mentioned problems, and is characterized by forming a reinforcing insulator for molding on a conductor connection portion of a cable. After that, cover from one end of the cable sheath to the other end of the cable sheath with a heat-shrinkable tube for receiving pressure, place a pressurized can with a built-in heater outside the tube, and provide a flange provided at the end of the pressurized can. Applying a heat-shrinkable tube for sealing over the tubular portion of the attached tubular packing and the heat-shrinkable tube for receiving pressure, and a joint portion between the heat-shrinkable tube for sealing and the tubular portion of the tubular packing with flange and A tape with an adhesive is wound around a joint between the heat-shrinkable tube for receiving pressure and the heat-shrinkable tube for sealing to seal, a pressurized gas is sealed in the pressurized can, and pressurization and heating are performed.

第1図は本発明の電力ケーブル接続部の形成方法の具
体例の要部の縦断面をあらわした説明図である。
FIG. 1 is an explanatory view showing a longitudinal section of a main part of a specific example of a method for forming a power cable connecting portion of the present invention.

ケーブル導体接続部(図示せず)上には、例えばポリ
エチレンテープ等の絶縁テープを巻き重ねてモールド用
補強絶縁体(1)を形成する。そして、一方のケーブル
シース(3)の端部から他方のケーブルシース(3)端
部にかけて加圧受用熱収縮チューブ(4)を施して、上
記モールド用補強絶縁体(1)及びケーブル絶縁体
(2)を覆い、圧力が全体に一様に及ぶようにすると共
に、モールド用補強絶縁体(1)を形成する絶縁テープ
巻層間に圧力媒体が流入するの防止する。
An insulating tape such as a polyethylene tape is wound around a cable conductor connecting portion (not shown) to form a reinforcing insulator for molding (1). Then, a pressure-receiving heat-shrinkable tube (4) is applied from the end of one of the cable sheaths (3) to the end of the other cable sheath (3), and the reinforcing insulator for molding (1) and the cable insulator ( 2), the pressure is uniformly applied to the whole, and the pressure medium is prevented from flowing between the insulating tape winding layers forming the reinforcing insulator for molding (1).

上記の外側にはヒーター(6)を内蔵した加圧缶
(5)を配置する。加圧缶(5)の両端部にはフランジ
付筒状パッキング(9)が設けられている。このフラン
ジ付筒状バッキング(9)はそのフランジ部(9a)が押
えフランジ(10)により加圧缶(5)端部に押圧されて
おり、その筒状部(9b)は加圧缶(5)の内部に延びて
いる。ケーブルシース(3)の外側には上記フランジ付
筒状バッキング(9)を支える2つ割構造のパッキング
支え管(8)があって、フランジ付筒状パッキング
(9)の筒状部(9b)を支えており、その先端部のテー
パ部(8a)に沿ってシール用熱収縮チューブ(11)が施
され、その両端はフランジ付筒状パッキング(9)の筒
状部(9b)上及び加圧受用熱収縮チューブ(4)上に位
置している。そして、上記シール用熱収縮チューブ(1
1)とフランジ付筒状パッキング(9)の筒状部(9b)
の合せ部及びシール用熱収縮チューブ(11)と加圧受用
熱収縮チューブ(4)の合せ部には、例えば粘着剤付の
ポリテトラフルオロエチレンテープのような粘着剤付き
の耐熱性テープの巻回によるシール(12a)(12b)が施
されている。この粘着剤付き耐熱性テープの巻回による
シールは、前記シール用熱収縮チューブ(11)の全面に
わたって巻き付ける方法でもよいが、作業性を良くする
ために両端部の合せ部のみに施した。なお、図面におい
て(7)はヒーター(6)の断熱層である。
A pressurized can (5) containing a heater (6) is arranged outside the above. At both ends of the pressurized can (5), a cylindrical packing (9) with a flange is provided. The flanged tubular backing (9) has its flange portion (9a) pressed against the end of the pressurized can (5) by a holding flange (10), and its tubular portion (9b) has a pressurized can (5). ) Extends inside. On the outside of the cable sheath (3), there is a packing supporting pipe (8) having a split structure for supporting the above-mentioned flanged tubular backing (9), and a tubular portion (9b) of the flanged tubular packing (9). A heat-shrinkable tube (11) for sealing is applied along the tapered portion (8a) at the tip, and both ends of the heat-shrinkable tube are placed on the cylindrical portion (9b) of the cylindrical packing (9) with a flange. It is located on the pressure-receiving heat-shrinkable tube (4). Then, the heat-shrinkable tube for sealing (1
1) and the cylindrical part (9b) of the cylindrical packing with flange (9)
A heat-resistant tape with an adhesive, such as a polytetrafluoroethylene tape with an adhesive, is attached to the joint between the heat-shrinkable tube for sealing and the heat-shrinkable tube for sealing (11) and the heat-shrinkable tube for pressure reception (4). The seals (12a) and (12b) are provided by turns. The sealing by winding the heat-resistant tape with the adhesive may be performed by wrapping the entire surface of the heat-shrinkable tube for sealing (11). However, in order to improve workability, the heat-shrinkable tape is applied only to the joint at both ends. In the drawing, (7) is a heat insulating layer of the heater (6).

このような状態で加圧缶(5)内部に加圧ガス(13)
を封入し、ヒーター(6)で加熱して補強絶縁体をモー
ルド成形する。
In this state, pressurized gas (13) is placed inside the pressurized can (5).
Is sealed and heated by a heater (6) to mold the reinforcing insulator.

(作用) 上述した本発明の接続部形成方法によれば、加圧缶内
の加圧ガスによる内圧は、従来のようにシール部を破壊
するように作用するのではなく、逆にシール力を増す方
向に作用するいわゆる自己シール方式として作用する。
因みに、第1図の構成で加圧缶を組立て、ガス圧9.5kg/
cm2Gを加えてもガス洩れは0であった。
(Operation) According to the connection portion forming method of the present invention described above, the internal pressure due to the pressurized gas in the pressurized can does not act to break the seal portion as in the related art, but rather reduces the sealing force. It acts as a so-called self-sealing method acting in the increasing direction.
By the way, assembling the pressurized can with the configuration of Fig. 1, the gas pressure is 9.5kg /
Gas leakage was zero even when cm 2 G was added.

この場合、加圧缶のヒーター部は断熱層により断熱し
ているとはいえ、洩れる熱によりシール部が昇温するこ
とがあるため、シール部にはポリテトラフロオロエチレ
ンテープのような耐熱性テープを用いた。
In this case, although the heater of the pressurized can is insulated by the heat insulation layer, the heat of the seal may rise due to the leaked heat, so that the seal has a heat resistant material such as polytetrafluoroethylene tape. Tape was used.

(発明の効果) 以上説明したように、本発明の電力ケーブル接続部の
形成方法によれば、加圧缶シール部でのガス洩れがな
く、良好なモールド接続部の形成ができる。特に長尺一
連ケーブルの中間接続部のモールド成形において、2つ
割構造の加圧缶を用いる場合に好適である。
(Effects of the Invention) As described above, according to the method of forming the power cable connection portion of the present invention, it is possible to form a good mold connection portion without gas leakage at the pressure can seal portion. Particularly, it is suitable for the case where a pressurized can having a split structure is used in the molding of the intermediate connection portion of a long series of cables.

なお、本発明の接続部形成方法は中間接続部に限ら
ず、終端接続部の形成にも適用出来るのは勿論である。
Note that the method of forming the connection portion of the present invention is not limited to the intermediate connection portion, but can be applied to the formation of the terminal connection portion.

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

第1図は本発明の電力ケーブル接続部の形成方法の具体
例の要部の縦断面をあらわした説明図である。 第2図は従来のモールド接続部の形成方法の一例の要部
の縦断面をあらわした説明図である。 1……モールド用補強絶縁体、2……ケーブル絶縁体、
3……ケーブルシース、4……加圧受用熱収縮チュー
ブ、5……加圧缶、6……ヒーター、7……断熱層、8
……パッキング支え管、9……フランジ付筒状パッキン
グ、9a……フランジ部、9b……筒状部、10……押えフラ
ンジ、11……シール用熱収縮チューブ、12a、12b……粘
着剤付耐熱性テープ巻きシール、13……加圧ガス。
FIG. 1 is an explanatory view showing a longitudinal section of a main part of a specific example of a method for forming a power cable connecting portion of the present invention. FIG. 2 is an explanatory view showing a longitudinal section of a main part of an example of a conventional method for forming a mold connection portion. 1 ... Reinforcement insulator for molding, 2 ... Cable insulator,
3 ... cable sheath, 4 ... heat-shrinkable tube for receiving pressure, 5 ... pressurized can, 6 ... heater, 7 ... heat insulating layer, 8
…… Packing support pipe, 9 …… Flanged cylindrical packing, 9a …… Flange section, 9b …… Cylinder section, 10 …… Holding flange, 11… Heat shrink tubing for sealing, 12a, 12b …… Adhesive Heat-resistant tape-wrapped seal, 13 ... Pressurized gas.

───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6,DB名) H02G 15/08 H02G 1/14──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) H02G 15/08 H02G 1/14

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】ゴム・プラスチック電力ケーブルのモール
ド接続部の形成において、ケーブルの導体接続部上にモ
ールド用補強絶縁体を形成した後、一方のケーブルシー
ス端部から他方のケーブルシース端部にかけて加圧受用
熱収縮チューブで覆い、その外側にヒーターを内蔵した
加圧缶を配置し、加圧缶の端部に設けたフランジ付筒状
パッキングの筒状部と前記加圧受用熱収縮チューブに跨
ってシール用熱収縮チューブを施し、このシール用熱収
縮チューブとフランジ付筒状パッキングの筒状部との合
せ部及び加圧受用熱収縮チューブとシール用熱収縮チュ
ーブとの合せ部に粘着剤付テープを巻回してシールし、
前記加圧缶内に加圧ガスを封入し、加圧及び加熱するこ
とを特徴とする電力ケーブル接続部の形成方法。
In the formation of a molded connection part of a rubber / plastic power cable, a reinforcing insulator for molding is formed on a conductor connection part of the cable, and then a cable is applied from one cable sheath end to the other cable sheath end. A pressure can, which is covered with a pressure-receiving heat-shrinkable tube and has a built-in heater outside of the pressure-receiving heat-shrinkable tube, straddles the tubular portion of the cylindrical packing with a flange provided at the end of the pressure can and the pressure-receiving heat-shrinkable tube. Apply a heat-shrinkable tube for sealing, and attach an adhesive to the joint between the heat-shrinkable tube for sealing and the cylindrical portion of the cylindrical packing with flange and the joint between the heat-shrinkable tube for receiving pressure and the heat-shrinkable tube for sealing. Wrap the tape and seal,
A method for forming a power cable connecting portion, wherein a pressurized gas is sealed in the pressurized can, and pressurization and heating are performed.
JP1114592A 1989-05-08 1989-05-08 Method of forming power cable connection Expired - Fee Related JP2760043B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1114592A JP2760043B2 (en) 1989-05-08 1989-05-08 Method of forming power cable connection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1114592A JP2760043B2 (en) 1989-05-08 1989-05-08 Method of forming power cable connection

Publications (2)

Publication Number Publication Date
JPH02294211A JPH02294211A (en) 1990-12-05
JP2760043B2 true JP2760043B2 (en) 1998-05-28

Family

ID=14641718

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1114592A Expired - Fee Related JP2760043B2 (en) 1989-05-08 1989-05-08 Method of forming power cable connection

Country Status (1)

Country Link
JP (1) JP2760043B2 (en)

Also Published As

Publication number Publication date
JPH02294211A (en) 1990-12-05

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