JPH0430689B2 - - Google Patents
Info
- Publication number
- JPH0430689B2 JPH0430689B2 JP15249885A JP15249885A JPH0430689B2 JP H0430689 B2 JPH0430689 B2 JP H0430689B2 JP 15249885 A JP15249885 A JP 15249885A JP 15249885 A JP15249885 A JP 15249885A JP H0430689 B2 JPH0430689 B2 JP H0430689B2
- Authority
- JP
- Japan
- Prior art keywords
- sheath
- power cable
- protrusions
- conductor
- large number
- 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
Links
- 239000004020 conductor Substances 0.000 claims description 14
- 229920003002 synthetic resin Polymers 0.000 claims description 9
- 239000000057 synthetic resin Substances 0.000 claims description 9
- 229920001971 elastomer Polymers 0.000 claims description 8
- 239000005060 rubber Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000008602 contraction Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000012212 insulator Substances 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920000915 polyvinyl chloride Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 229920002614 Polyether block amide Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Insulated Conductors (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は端末接続部におけるシース伸縮による
不具合いの発生を防止した電力ケーブルに関し、
主として屋外配線に用いられるものである。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power cable that prevents defects caused by expansion and contraction of the sheath at the terminal connection portion.
It is mainly used for outdoor wiring.
［従来の技術］
ポリエチレン、ポリ塩化ビニール等合成樹脂製
またはゴム製のシースを被覆した電力ケーブル
は、その端末接続部において、前記シースが、使
用中におけるヒートサイクル、外気温度の変化等
に起因して電力ケーブルの軸方向に伸縮を繰り返
す。[Prior Art] A power cable coated with a sheath made of synthetic resin such as polyethylene or polyvinyl chloride or rubber is susceptible to damage caused by heat cycles, changes in outside temperature, etc. during use at the terminal connection portion of the power cable. The cable expands and contracts repeatedly in the axial direction of the power cable.
この結果、シースにずれが発生し、電力ケーブ
ルの内部構成物が露出したり、この内部構成物と
シースとの間に浸水し、電力ケーブルに悪い影響
を与える恐れがある。 As a result, the sheath may shift, exposing the internal components of the power cable, or causing water to enter between the internal components and the sheath, which may adversely affect the power cable.
そこで、従来から電力ケーブルの端末接続部に
おけるシースの伸縮を防止する為、種々の提案が
なされている。例えば、
(1) 電力ケーブルのシースの外径より小さい内径
のコイルばねからなるシースずれ防止具を、シ
ースの外側に嵌融着し、このコイルばねの両端
末をブラケツトに取り付ける。（実開昭59−
99627号公報参照）
(2) 電力ケーブルの端末接続部に係止部材を固着
し、この係止部材を支持物に固定する。（実開
昭58−115826号公報参照）
しかしながら、上述した各従来のシースの伸縮
防止構造には次のような問題点がある。すなわ
ち、
(a) 上記(1)のものは、シースの外径よりも小さ
い内径のコイルばねからなるシースずれ防止
具をシースの外側に嵌融着している関係上、
コイルばねの強い締め付け力により、シース
と共に絶縁体等の内部構成物が締め付けられ
る。 Therefore, various proposals have been made to prevent expansion and contraction of the sheath at the terminal connection portion of the power cable. For example, (1) A sheath slippage prevention device consisting of a coil spring with an inner diameter smaller than the outer diameter of the power cable sheath is fitted and fused to the outside of the sheath, and both ends of this coil spring are attached to a bracket. (Jitsukai 59-
(Refer to Publication No. 99627) (2) A locking member is fixed to the terminal connection portion of the power cable, and this locking member is fixed to a support. (Refer to Japanese Utility Model Application Publication No. 115826/1983) However, each of the conventional sheath expansion/contraction prevention structures described above has the following problems. That is, (a) In the case of (1) above, a sheath slippage prevention device consisting of a coil spring with an inner diameter smaller than the outer diameter of the sheath is fitted and fused to the outside of the sheath.
Due to the strong tightening force of the coil spring, internal components such as the insulator are tightened together with the sheath.
この結果、使用中におけるヒートサイク
ル、外気温度の変化等に起因するケーブルの
伸縮により、絶縁体等電力ケーブルの内部構
成物に悪い影響を与える。 As a result, the internal components of the power cable, such as the insulator, are adversely affected by expansion and contraction of the cable due to heat cycles, changes in outside temperature, etc. during use.
(b) 上記(2)のものは、その係止部材の構造か
ら、シースと係止部材とをしつかりと固定で
きない一方、これを解消するため、係止部材
を外側から強力に締め付けると、上述した(1)
と同様に、強い締め付け力により絶縁体等電
力ケーブルの内部構成物に悪い影響を与え
る。 (b) In the case of (2) above, due to the structure of the locking member, the sheath and the locking member cannot be securely fixed, but to solve this problem, if the locking member is strongly tightened from the outside, As mentioned above (1)
Similarly, strong clamping force has a negative effect on the internal components of the power cable, such as the insulator.
［発明の目的］
本発明は上述の問題点を解消するために検討し
た結果、達成されたものである。[Object of the Invention] The present invention has been achieved as a result of studies to solve the above-mentioned problems.
従つて本発明の目的はゴムまたは合成樹脂製の
シースを被覆した電力ケーブルの、主として端末
接続部に発生するシースの伸縮による不具合を容
易かつ確実に防止する構造の電力ケーブルを提供
するものである。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a power cable having a structure that easily and reliably prevents malfunctions caused by expansion and contraction of the sheath that occur mainly at the terminal connection portions of power cables coated with rubber or synthetic resin sheaths. .
［発明の構成］
すなわち本発明は導体の外周に中間層を介して
ゴムまたは合成樹脂性のシースを被覆した電力ケ
ーブルにおいて、該シースを互いに収縮率の異な
るゴムまたは可撓性の合成樹脂からなる少なくと
も２層で構成し、かつ内側のシース構成層の外周
面に多数の凸条を並列に配置したことを特徴とす
る電力ケーブル、をその要旨とするものである。[Structure of the Invention] That is, the present invention provides a power cable in which the outer periphery of a conductor is covered with a rubber or synthetic resin sheath via an intermediate layer, and the sheath is made of rubber or flexible synthetic resin with different shrinkage rates. The gist thereof is a power cable that is composed of at least two layers, and is characterized in that a large number of protrusions are arranged in parallel on the outer peripheral surface of the inner sheath-constituting layer.
本発明の電力ケーブルは導体の外周に中間層を
介してゴムまたは合成樹脂製のシースを被覆した
ものであるが、中間層としては内部半導電層、絶
縁体層、半導電性テープ、金属遮蔽テープ、押さ
え巻テープ等がある。 The power cable of the present invention has a conductor coated with a rubber or synthetic resin sheath via an intermediate layer, and the intermediate layer includes an internal semiconductive layer, an insulating layer, a semiconductive tape, and a metal shield. There are tapes, pressure tapes, etc.
また、シースの材質としてはたとえば天然ゴ
ム、合成ゴムまたはポリエチレン、ポリ（エチレ
ン／プロピレン）、ポリ（エチレン／酢酸ビニ
ル）、ポリ塩化ビニル、ポリエーテルエステル、
ポリエーテルアミド等の可撓性の合成樹脂が用い
られる。 In addition, examples of the material of the sheath include natural rubber, synthetic rubber, polyethylene, poly(ethylene/propylene), poly(ethylene/vinyl acetate), polyvinyl chloride, polyether ester,
A flexible synthetic resin such as polyetheramide is used.
シースは２層以上必要とし、内側シースの外周
面には多数の凸条が並列に配置されている。凸条
の配列方向は特に限定されず、導体の長手方向に
平行、直角、あるいは傾斜角を有して螺旋状に配
設されてもよい。 The sheath requires two or more layers, and a large number of protrusions are arranged in parallel on the outer peripheral surface of the inner sheath. The direction in which the protrusions are arranged is not particularly limited, and they may be arranged in a spiral shape parallel to the longitudinal direction of the conductor, at right angles, or at an inclined angle.
またシースの内側層と外側層は互いに収縮率の
異なる材質から選ばれることが必要であり、こう
することによつて各層に収縮が起きても隣接する
層間に強力な摩擦抵抗が働き、シース全体の収縮
を防止する。そして、内側層の方に収縮率の低い
材質を適用するのが特に好ましい。 In addition, the inner and outer layers of the sheath must be selected from materials with different shrinkage rates, so that even if each layer contracts, strong frictional resistance will act between adjacent layers, and the entire sheath will Prevents shrinkage. It is particularly preferable to use a material with a low shrinkage rate for the inner layer.
以下、本発明の実施例を図面を参照して具体的
に説明する。 Embodiments of the present invention will be specifically described below with reference to the drawings.
［実施例］
第１図は本発明の第１の実施例を示す電力ケー
ブルの斜視図であり、金属線の撚線から成る導体
１の外周には内部半導電層２が被覆され、その外
側には絶縁体層３が被覆されている。また、絶縁
体層３には半導電性テープ４、金属遮蔽テープ５
および押さえ巻テープ６が順次巻回されている。[Embodiment] FIG. 1 is a perspective view of a power cable showing a first embodiment of the present invention, in which the outer periphery of a conductor 1 made of twisted metal wires is coated with an internal semiconducting layer 2, and the outer is coated with an insulating layer 3. In addition, the insulating layer 3 includes a semiconductive tape 4 and a metal shielding tape 5.
and a pressure winding tape 6 are sequentially wound.
押さえ巻テープ６の外周には内側シース７およ
び外側シース８が２層構造で被覆されている。そ
して内側シース７は外側シース８より収縮率の小
さい材質で構成され、その外周表面には多数の凸
条９が導体の長手方向に平行して配列されてい
る。 The outer periphery of the pressure tape 6 is covered with an inner sheath 7 and an outer sheath 8 in a two-layer structure. The inner sheath 7 is made of a material with a smaller contraction rate than the outer sheath 8, and a large number of protrusions 9 are arranged on its outer peripheral surface in parallel to the longitudinal direction of the conductor.
この実施例では内側シースの凸状９が導体の長
手方向に配列されているので、たとえば外側シー
ス８が収縮し、いわゆるシユリンクバツクを起こ
しても内側シース７との間に大きな摩擦が働き、
中間層あるいは導体の露出等の不具合は起こらな
い。 In this embodiment, the convex portions 9 of the inner sheath are arranged in the longitudinal direction of the conductor, so that even if the outer sheath 8 contracts and causes so-called shrink back, a large amount of friction acts between it and the inner sheath 7.
No defects such as exposure of intermediate layers or conductors occur.
第２図は第２の実施例で示しており、電力ケー
ブルの積層構造は第１の実施例で同じであるが、
内側シース７の凸条９が導体１の長手方向に対し
て傾斜角を有し、螺旋状に配列されている。 FIG. 2 shows the second embodiment, and the laminated structure of the power cable is the same as in the first embodiment, but
The protrusions 9 of the inner sheath 7 have an inclination angle with respect to the longitudinal direction of the conductor 1, and are arranged in a spiral shape.
この実施例の場合、内側シース７と外側シース
８との摩擦力は更に大きくなつて、外側シース８
のシユリンクバツクの影響を受けにくくなる。 In this embodiment, the frictional force between the inner sheath 7 and the outer sheath 8 is further increased, and the outer sheath 8
becomes less susceptible to the effects of shrinkage.
第３図は第３の実施例を示しており、電力ケー
ブルの積層構造は第１，第２の実施例と同じであ
るが、内側シース７の凸条９が導体１の長手方向
に対して直角であり、リング状に設けられてい
る。 FIG. 3 shows a third embodiment, in which the laminated structure of the power cable is the same as in the first and second embodiments, but the protrusions 9 of the inner sheath 7 are arranged in the longitudinal direction of the conductor 1. It is perpendicular and arranged in a ring shape.
この実施例の場合、特に外側シース８の長手方
向に対するシユリンクバツクを防止する効果が大
きい。 This embodiment is particularly effective in preventing shrinkage in the longitudinal direction of the outer sheath 8.
以上３つの実施例を挙げたが、いずれも内側シ
ースと外側シースの材質は異なつており、更に内
側シースに収縮率の低い材質を選ぶことが好まし
い。また、各凸条は並列になつていれば十分であ
り、上記３実施例の他、ジグザグ、波状などのパ
ターンも可能である。 In the three embodiments described above, the inner sheath and outer sheath are made of different materials, and it is preferable to select a material with a low shrinkage rate for the inner sheath. It is sufficient that the protrusions are arranged in parallel, and in addition to the three embodiments described above, zigzag, wavy, and other patterns are also possible.
［発明の効果］
本発明は電力ケーブルのシースを互いに収縮率
の異なるゴムまたは可撓性の合成樹脂からなる少
なくとも２層で構成し、内側シースの外周面に多
数の凸条を並列に設けたものであるため、次のよ
うな効果を奏する。[Effects of the Invention] The present invention comprises a power cable sheath made of at least two layers made of rubber or flexible synthetic resin with different shrinkage rates, and a large number of protrusions arranged in parallel on the outer peripheral surface of the inner sheath. As a result, it has the following effects.
(1) 外側シースに残留歪が生じても、隣接するシ
ース層の収縮率が互いに異なり、かつ内側のシ
ース層の表面に凸条が配置されているので、凸
条による摩擦が働き、端末部にシユリンクバツ
クによる不具合が生じない。(1) Even if residual strain occurs in the outer sheath, the shrinkage rates of adjacent sheath layers are different from each other, and the protrusions are arranged on the surface of the inner sheath layer, so the friction caused by the protrusions acts and the terminal part No problems occur due to shrinkage.
(2) シユリンクバツク防止のための治具および融
着作業が不要となり、コストダウンがはかれ
る。(2) There is no need for jigs or fusing work to prevent shrinkage, leading to cost reductions.
(3) 従来のシユリンクバツク防止方法に比べ内部
構造を損傷することがなく、製造も容易であ
る。(3) Compared to conventional shrink-back prevention methods, this method does not damage the internal structure and is easy to manufacture.
第１図〜第３図は本発明の実施例であり、第１
図は第１実施例の電力ケーブルの斜視図、第２図
は第２実施例の電力ケーブルの斜視図、第３図は
第３実施例の電力ケーブルの斜視図である。
１……導体、２……内部半導体層、３……絶縁
体層、７……内側シース、８……外側シース、９
……凸条。
1 to 3 show embodiments of the present invention, and the first
FIG. 2 is a perspective view of the power cable of the first embodiment, FIG. 2 is a perspective view of the power cable of the second embodiment, and FIG. 3 is a perspective view of the power cable of the third embodiment. DESCRIPTION OF SYMBOLS 1... Conductor, 2... Inner semiconductor layer, 3... Insulator layer, 7... Inner sheath, 8... Outer sheath, 9
...Protrusions.
Claims (1)
樹脂性のシースを被覆した電力ケーブルにおい
て、該シースを互いに収縮率の異なるゴムまたは
可撓性の合成樹脂からなる少なくとも２層で構成
し、かつ内側のシース構成層の外周面に多数の凸
条を並列に配置したことを特徴とする電力ケーブ
ル。 ２ 多数の凸条が、導体の長手方向に配列されて
いることを特徴とする特許請求の範囲第１項記載
の電力ケーブル。 ３ 多数の凸条が、導体の長手方向に対して螺旋
状に配列されていることを特徴とする特許請求の
範囲第１項記載の電力ケーブル。 ４ 多数の凸条が、導体の長手方向に対して直角
方向に配列されていることを特徴とする特許請求
の範囲第１項記載の電力ケーブル。[Scope of Claims] 1. A power cable in which the outer periphery of a conductor is coated with a rubber or synthetic resin sheath via an intermediate layer, the sheath being made of at least two rubber or flexible synthetic resins having different shrinkage rates. A power cable consisting of layers, and characterized in that a large number of protrusions are arranged in parallel on the outer peripheral surface of the inner sheath forming layer. 2. The power cable according to claim 1, wherein a large number of protrusions are arranged in the longitudinal direction of the conductor. 3. The power cable according to claim 1, wherein a large number of protrusions are arranged spirally in the longitudinal direction of the conductor. 4. The power cable according to claim 1, wherein a large number of protrusions are arranged in a direction perpendicular to the longitudinal direction of the conductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60152498A JPS6215706A (en) | 1985-07-12 | 1985-07-12 | power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60152498A JPS6215706A (en) | 1985-07-12 | 1985-07-12 | power cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6215706A JPS6215706A (en) | 1987-01-24 |
| JPH0430689B2 true JPH0430689B2 (en) | 1992-05-22 |
Family
ID=15541776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60152498A Granted JPS6215706A (en) | 1985-07-12 | 1985-07-12 | power cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6215706A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0532902Y2 (en) * | 1987-03-31 | 1993-08-23 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4728241Y1 (en) * | 1971-12-22 | 1972-08-26 | ||
| JPS52138721A (en) * | 1976-05-15 | 1977-11-19 | Matsushita Electric Works Ltd | Eaves trough |
-
1985
- 1985-07-12 JP JP60152498A patent/JPS6215706A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6215706A (en) | 1987-01-24 |
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