JPH03146911A - Method for connecting metallic jacket tube of optical fiber cord or cable - Google Patents
Method for connecting metallic jacket tube of optical fiber cord or cableInfo
- Publication number
- JPH03146911A JPH03146911A JP28503189A JP28503189A JPH03146911A JP H03146911 A JPH03146911 A JP H03146911A JP 28503189 A JP28503189 A JP 28503189A JP 28503189 A JP28503189 A JP 28503189A JP H03146911 A JPH03146911 A JP H03146911A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- tube
- welding
- sleeve
- temperature
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims description 17
- 238000003466 welding Methods 0.000 claims abstract description 49
- 239000000463 material Substances 0.000 claims abstract description 32
- 238000005253 cladding Methods 0.000 claims description 49
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 21
- 230000004927 fusion Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052802 copper Inorganic materials 0.000 abstract description 10
- 239000010949 copper Substances 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 abstract description 7
- 230000000116 mitigating effect Effects 0.000 abstract description 7
- 239000010959 steel Substances 0.000 abstract description 7
- 239000000835 fiber Substances 0.000 abstract description 5
- 238000013021 overheating Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 230000003685 thermal hair damage Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000809 Alumel Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 206010017472 Fumbling Diseases 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229920006015 heat resistant resin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は、光ファイバコードまたはケーブルの接続に
おいて、金属製被覆管内に光ファイバが挿入された状態
で被覆管どうしを接続する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for connecting optical fiber cords or cables, with optical fibers being inserted into metal cladding tubes.
この発明における光ファイバとは、コアとクラッド層か
らなる光フアイバ素線、この光フアイバ素線を合成樹脂
、金属、セラミックなどでコーティングしたもの、なら
びにこれらの単心のもの、多心のもの、より線のものお
よびテープ状のものをいう。また、金属製被覆管とは鋼
、銅、アルミニウム、チタンその他の金属製被覆管をい
う。The optical fiber in this invention includes an optical fiber consisting of a core and a cladding layer, an optical fiber coated with a synthetic resin, metal, ceramic, etc., a single core fiber, a multi-core fiber, etc. Refers to stranded wires and tape-shaped wires. Moreover, the metal cladding tube refers to a cladding tube made of steel, copper, aluminum, titanium, or other metals.
［従来の技術］
空中、海底、地下などに延線される光ファイバは、過度
の張力を防止したり、耐環境性をもたせるために金属管
などで被覆して用いられることがある。たとえば、近年
広く用いられるようになった九通郁用ケーブルには、光
ファイバが強度的に弱いことから、金属製被覆管に挿入
された光ファイバが一要求されるようになってきている
。[Prior Art] Optical fibers that are extended in the air, under the sea, underground, etc. are sometimes coated with a metal tube or the like to prevent excessive tension or to provide environmental resistance. For example, the nine-way cables that have become widely used in recent years require optical fibers inserted into metal cladding tubes because the optical fibers are weak in strength.
また、海底光ケーブルのように長距離間に延線されるも
のでは、光ファイバが挿入された状態で金属製被覆管と
うしが接続される。このような接続では、接続部におい
て、被覆管どうしの間に接続管あるいは接続筒を介して
被覆管を接続する。In addition, in cables that are extended over long distances, such as submarine optical cables, metal cladding tubes are connected with optical fibers inserted. In such a connection, the cladding tubes are connected through a connecting tube or a connecting tube between the cladding tubes at the connecting portion.
気密性または水密性が要求される個所では、溶接で接合
する方法が適している。たとえば、光ファイバを被覆す
る金属管どうしの接続方法として、実開昭５９−３３０
１５号公報で開示された方法がある。Welding is suitable for locations where airtightness or watertightness is required. For example, as a method for connecting metal tubes covering optical fibers,
There is a method disclosed in Publication No. 15.
この方法では、接続筒と光フアイバケーブルのシース
（金属製被覆管）との接続部を溶着または溶接により一
体化する際、接続筒および光フアイバケーブルのシース
のそれぞれにまたがる保護パイプ内に、光ファイバを挿
入している。In this method, the connecting tube and the sheath of the optical fiber cable are
When integrating the connection portion with the (metal cladding tube) by welding or welding, the optical fiber is inserted into a protective pipe that spans the connection tube and the sheath of the optical fiber cable.
〜般に、プラスチックファイバは、光フアイバ素線の短
時間の耐熱温度が約２００℃である。また、ガラス系光
ファイバでは、コアの外側のクラッドを薄く樹脂被覆し
である被覆材の短時間耐熱温度が約２００℃である。い
ずれにしても、約２００℃前後の温度にさらされると、
光フアイバ素線は熱損傷を受ける虞れが生じる。また、
これ以下の温度でも、プラスチック樹脂は軟化もしくは
溶融する可能性がある。光フアイバ素線に応力を与えた
まま凝固し、伝送損失を増加させる場合がある。従って
長時間の通信ラインの信頼性を得るためには軟化もしく
は溶融温度以下で溶着または溶接する必要がある。この
安全温度は約８０℃である。In general, plastic fibers have a short-term heat resistance temperature of about 200°C. Further, in a glass optical fiber, the short-time heat resistance temperature of the coating material, which is a thin resin coating on the outer cladding of the core, is about 200°C. In any case, when exposed to temperatures around 200℃,
There is a risk that the optical fiber wire may be thermally damaged. Also,
Even at temperatures below this, plastic resins can soften or melt. The optical fiber may solidify while still being stressed, increasing transmission loss. Therefore, in order to obtain long-term communication line reliability, it is necessary to weld or weld at a temperature below the softening or melting temperature. This safe temperature is approximately 80°C.
一方、光ファイバが挿入された金属製被覆管を接合する
場合、通常の溶融溶接では溶接部近傍が２００℃を超え
る。被覆管の内径が大きく、光ファイバと被覆管内壁と
の間に十分な隙間がとれる場合には、接続部直下の光フ
ァイバに保護管をかぶせることによって、溶接ｎ！ｉの
熱から光ファイバを絶縁することは容易である。ところ
が、被覆管が細径あるいは内径が小さくなるに従い、溶
接時の熱から光ファイバを遮断することは容易でなくな
る。また、被覆管が厚内になると一度に溶融すべき金属
量が多くなり、溶接に大量の入熱が必要となる。この結
果、溶接部の冷却が間に合わなくなり、管内の光ファイ
バは焼損する。逆に、肉厚が極めて薄くなると、溶融金
属が管内に溶は落ち、光ファイバは損傷する。光ファイ
バの損傷は、伝送損失の増大を招く。On the other hand, when joining metal cladding tubes into which optical fibers have been inserted, the temperature near the welded portion exceeds 200° C. in normal fusion welding. If the inner diameter of the cladding tube is large and there is sufficient clearance between the optical fiber and the inner wall of the cladding tube, welding n! It is easy to insulate optical fibers from the heat of i. However, as the diameter or inner diameter of the cladding tube becomes smaller, it becomes difficult to shield the optical fiber from the heat during welding. Furthermore, when the cladding tube becomes thicker, the amount of metal that must be melted at once increases, and a large amount of heat input is required for welding. As a result, the welded part cannot be cooled in time, and the optical fiber inside the tube is burnt out. Conversely, if the wall thickness becomes extremely thin, molten metal will drip into the tube and damage the optical fiber. Damage to optical fibers results in increased transmission loss.
このような光ファイバの熱による損傷を防止するために
、１回に１点だけ溶接し、できるだけ最小入熱のアーク
を短時間照射しながら点をつないで溶接線を完成させる
方法が採用されている。また、開先形状に工夫を加えて
溶接入熱量を抑え、溶接熱を管の内部に及ぼさない手段
も取られている。さらにまた、水冷、空冷などの冷却方
法も併用されている。In order to prevent such heat damage to optical fibers, a method has been adopted in which only one point is welded at a time, and the weld line is completed by connecting the points while irradiating an arc with the minimum heat input for a short period of time. There is. Additionally, measures have been taken to reduce the amount of welding heat input by modifying the groove shape to prevent welding heat from reaching the inside of the tube. Furthermore, cooling methods such as water cooling and air cooling are also used.
［発明が解決しようとする課題］
しかし、金属製被覆管を接続する上記従来の方法には、
次のような課題があった。[Problem to be solved by the invention] However, the above conventional method of connecting metal cladding tubes has the following problems:
The following issues were encountered.
１回に１点だけ溶接する方法では、実際の溶接において
内部温度を測定しながら作業できることが少なく、手探
りとなる。したがって、数十点の接合点のすべてが光フ
ァイバの許容温度を超えないという保証を与えるために
は、かなり低温度で接合できることが必要である。殊に
、長期にわたる通信ラインの信頼性を得るためには８０
℃以下の低温度で接合できることが必要である。With the method of welding only one point at a time, it is rare to be able to measure the internal temperature during actual welding, resulting in a lot of fumbling. Therefore, in order to guarantee that all of the dozens of bonding points do not exceed the permissible temperature of the optical fiber, it is necessary to be able to bond at a fairly low temperature. In particular, in order to obtain long-term communication line reliability,
It is necessary to be able to bond at low temperatures below ℃.
また、実際の溶接では常に正常な溶接が行われるとは限
らない。たとえば、溶接不良部を修正するときに、狙い
位置のずれなどで予定よりも太きな熱が管に与えられ、
管内温度が光ファイバの許容限界温度近くになることが
ある。そのため、管内温度の上昇限を更に低く抑えて溶
接する必要がある。Furthermore, in actual welding, normal welding is not always performed. For example, when repairing a defective weld, a greater amount of heat than planned may be applied to the pipe due to misalignment of the target position.
The temperature inside the tube may be close to the allowable limit temperature of the optical fiber. Therefore, it is necessary to perform welding while keeping the temperature rise within the pipe even lower.
溶接部直下の管内温度を上げないために、耐火セラミッ
クまたは耐熱樹脂を遮熱材として使用する方法が考えら
れる。これら材料は熱伝導率がｌＸｌ０５１ ｘ １０
−’ ｋｃａｌ／ｍｈ’ｃのオーダーで小さく、光ファ
イバへの熱移動を阻止できると期待さる。In order to prevent the temperature inside the pipe immediately below the weld from increasing, it is possible to use fire-resistant ceramic or heat-resistant resin as a heat shield material. These materials have a thermal conductivity of lXl051 x 10
It is small on the order of -'kcal/mh'c and is expected to prevent heat transfer to the optical fiber.
しかし、使用形状が薄肉管で単位長さ当たりの質量が小
さく、熱容量か小さいため、遮熱材自身の温度が急速に
上昇し、光ファイバを熱から保護するには十分でない。However, since the used shape is a thin-walled tube, the mass per unit length is small, and the heat capacity is small, the temperature of the heat shield material itself rises rapidly and is not sufficient to protect the optical fiber from heat.
そこで、この発明は溶接時の熱による光ファイバの損傷
を防止することができる、光ファイバコードまたはケー
ブルの金属製被覆管の接続方法を提供するものである。Therefore, the present invention provides a method for connecting a metal cladding tube of an optical fiber cord or cable, which can prevent damage to the optical fiber due to heat during welding.
［課題を解決するための手段］
この発明の光ファイバコードまたはケーブルの金属製被
覆管の接続方法は、光ファイバが金属製被覆管に隙間を
もって挿入された光ファイバコードまたはケーブルの被
覆管どうし・を溶融溶接により接続する際に、溶接部お
よびその前後にわたって上記隙間に過熱緩和材を介！Ｅ
させて溶融溶接する。[Means for Solving the Problems] The method for connecting metal cladding tubes of optical fiber cords or cables of the present invention connects cladding tubes of optical fiber cords or cables in which optical fibers are inserted into metal cladding tubes with gaps. When connecting by fusion welding, use overheat mitigation material in the gap above the weld area and before and after it! E
to melt and weld.
過熱緩和材として、熱伝導率、単位体積当り熱容量もし
くは反射率が被覆管に比べて高い材料、またはこれら性
質の２もしくは３を併わせ持った材料が用いられる。高
熱伝導率物質としては、５０〜３５０ｋｃａｌ／ｍｈ”
ｃの物質が望ましい。たとえば、ＳｉＣセラミックス、
銅、銅合金、アルミニュウム、アルミニュウム合金など
である。被覆管が鋼製である場合、鋼の熱伝導率が３９
ｋｃａｌ／ｍｈ”ｃであり、高熱伝導率物質として入手
しゃすい銅のそれは３４０ｋｃａｌ／ｍｈ’ｃで８倍以
上である。単位体積当り高熱容量物質としては、銅、鋼
、ニッケルなどが用いられる。密度と比熱の積［ｋｃａ
ｌ・ｃｍ−３・ｏｃ−ｌ ］か０．５０以上が望ましい
。また、高反射率物質としては、研磨仕上げの金属など
がある。As the superheat mitigation material, a material having higher thermal conductivity, higher heat capacity per unit volume, or higher reflectance than the cladding tube, or a material having two or three of these properties is used. As a material with high thermal conductivity, it is 50 to 350 kcal/mh”
Substance c is preferable. For example, SiC ceramics,
Copper, copper alloy, aluminum, aluminum alloy, etc. If the cladding is made of steel, the thermal conductivity of steel is 39
kcal/mh'c, and that of copper, which is available as a high thermal conductivity material, is 340 kcal/mh'c, which is more than eight times as high.As the high heat capacity material per unit volume, copper, steel, nickel, etc. are used. Product of density and specific heat [kca
l·cm-3·oc-l] is preferably 0.50 or more. Furthermore, examples of the high reflectance material include polished metal.
過熱緩和材を被覆管と光ファイバとの間に介在させる方
法として、管もしくは管を長手方向に沿って２〜４分割
した形状に高熱伝導率物質を成形したもので光ファイバ
を覆う方法、線状の過熱緩和材を光ファイバに巻き付け
る方法、または粉状もしくは粒状の過熱緩和材を被覆管
と光ファイバとの間の隙間に充填する方法などがある。As a method of interposing a superheat mitigation material between the cladding tube and the optical fiber, there is a method of covering the optical fiber with a tube or a tube divided into 2 to 4 parts along the longitudinal direction with a high thermal conductivity material molded, and a wire. There is a method of winding a desuperheating material around an optical fiber, or a method of filling a gap between a cladding tube and an optical fiber with a powdered or granular desuperheating material.
過熱緩和材を介在させる範囲は溶接部およびこれの前後
であって、その長さは管内径の５〜２０倍程度である。The range in which the overheating alleviation material is interposed is the welded part, before and after the welded part, and its length is about 5 to 20 times the inner diameter of the pipe.
温度勾配を大にするために、被覆管や管状の過熱緩和材
の外の溶接部から離れた部分を冷却すれば、これが内部
の溶接部直下と連続している過熱緩和材を冷却して、溶
接部直下の熱は伝導により大きな移動速度で放散する。In order to increase the temperature gradient, if you cool the outer part of the cladding or tubular desuperheating material away from the weld, this will cool the internal desuperheating material directly below the weld, and Heat immediately below the weld is dissipated by conduction at a high moving speed.
冷却方法としては水流、ガス流、空気流、トライアイス
、液体窒素等を被覆管または過熱緩和材に接触、循環さ
せる。As a cooling method, water flow, gas flow, air flow, tri-ice, liquid nitrogen, etc. are brought into contact with the cladding tube or the superheat mitigation material and circulated.
［作用］
過熱緩和材が高熱伝導率物質よりなる場合には、被覆管
の溶接部の熱の大部分は熱伝導により溶接部から管の上
流側および下流側に分散される。過熱緩和材が単位体積
当り高熱容量物質よりなる場合には、溶接部の熱の大部
分は過熱緩和材により吸収される。また、過熱緩和材が
高反射率物質よりなる場合には、溶接部から管内に放射
された熱の大部分が被覆管の内壁側に反射され、光ファ
イバにはわずかじか到達しない。これらの結果、溶接部
直下にある光ファイバに伝達される熱量は小さく、光フ
ァイバが損傷しない程度に光ファイバの過熱は緩和され
る。すなわち、光ファイバは短時間の許容限界温度の２
００℃かつ軟化もしくは溶融に関する安全温度が約８０
℃以下に保持される。[Function] When the superheat mitigation material is made of a material with high thermal conductivity, most of the heat at the welded portion of the cladding tube is dispersed from the welded portion to the upstream and downstream sides of the tube by thermal conduction. When the desuperheating material is made of a material having a high heat capacity per unit volume, most of the heat in the weld zone is absorbed by the desuperheating material. Furthermore, when the overheating mitigation material is made of a highly reflective material, most of the heat radiated into the tube from the welded portion is reflected by the inner wall of the cladding tube, and only a small amount reaches the optical fiber. As a result, the amount of heat transferred to the optical fiber directly below the weld is small, and overheating of the optical fiber is alleviated to the extent that the optical fiber is not damaged. In other words, the optical fiber has a short-term permissible temperature limit of 2
00℃ and the safe temperature for softening or melting is approximately 80℃
kept below ℃.
［実施例コ
第１図（ａ）および（ｂ）は、この発明による被覆管の
接続例を示している。[Example 1] Figures 1(a) and 1(b) show examples of connections of cladding tubes according to the present invention.
光フアイバ心線１ （外径０．４ｍｍ）が銅管４ （外
径２ 、８ｍｍ、内径２．４ｍｍ、長さ６００ｍｍ）を
介して軟鋼製被覆管２ （外径８．０ｍｍ、内径３ 、
０ｍｍ）に挿入されており、この被覆管２がスリーブ３
にプラズマ接合され接続部を構成する。スリーブ３ （
外径１１ 、０ｍｍ、内径８．１ ｍｍ）は軟鋼管であ
り、っば５（突出し長さ １．０ｍｍ、厚さ ０．５ｍ
ｍ）を備えている。つば５は溶接の際溶加材として溶融
する。An optical fiber core 1 (outer diameter 0.4 mm) is connected to a mild steel cladding tube 2 (outer diameter 8.0 mm, inner diameter 3,
0mm), and this cladding tube 2 is inserted into the sleeve 3.
is plasma bonded to form the connection part. Sleeve 3 (
The outer diameter 11.0 mm, inner diameter 8.1 mm) is a mild steel tube, and the tube 5 (projection length 1.0 mm, thickness 0.5 m) is made of mild steel.
m). The collar 5 is melted as a filler metal during welding.
まず、被覆管２の端部から光フアイバ心線１を口出しし
、スリーブ３を被覆管２にかぶせ、接合部の奥（第１図
（ａ）において左側）に後退させておく。ついで、内部
に光フアイバ心線１を通しながら、銅管４を被覆管２に
挿入する。光フアイバ心線１どうじの接合が終ったら、
接合部およびこれの前後にわたるように銅管４を移動す
る。さらに、スリーブ３を移動して接合部につば５を重
ねる。被覆管２とスリーブ３の重ね代は８０ＩＩＩＩＩ
ｌである。First, the optical fiber core 1 is brought out from the end of the cladding tube 2, the sleeve 3 is placed over the cladding tube 2, and the sleeve 3 is retracted to the back of the joint (to the left in FIG. 1(a)). Next, the copper tube 4 is inserted into the cladding tube 2 while the optical fiber core wire 1 is passed through the inside. Once the optical fiber core wire 1 has been spliced,
Move the copper tube 4 so that it spans the joint and the front and back of this. Furthermore, the sleeve 3 is moved to overlap the collar 5 at the joint. The overlap between cladding tube 2 and sleeve 3 is 80III
It is l.
溶接はまず、第１図（ｂ）に示す位置Ｗ０゜＋Ｗ２゜：
ＷＩｏ：Ｗ２Ｏ順に移動して点接合し、スリーブ３の端
面を固定する。ついで、出発点Ｗｏｏに戻って順次点接
合を繰り返し、全周溶接線を完成する。Welding begins at the position W0° + W2° shown in Figure 1(b):
Moving in the order of WIo:W2O, point joining is performed to fix the end face of the sleeve 3. Then, returning to the starting point Woo, point joining is repeated one after another to complete the entire circumference weld line.
溶接は直流プラズマを用い、溶接トーチ方向６は第１図
（ａ）に示すように被覆管２と４５′の角度をなし、溶
接ビームはつば５を狙って照射する。１溶接点の溶接条
件は、溶接電流８０ Ａ、アーク電圧２８Ｖ、アーク照
射時間０．５ｓｅｃで、シールドはＡｒシールド、流量
５ Ｑ／ｍｉｎである。溶接は４０点仕−Ｌげを標準と
している。Welding is performed using direct current plasma, the welding torch direction 6 forms an angle 45' with the cladding tube 2, as shown in FIG. 1(a), and the welding beam is directed at the collar 5. The welding conditions for one welding point were a welding current of 80 A, an arc voltage of 28 V, an arc irradiation time of 0.5 sec, an Ar shield, and a flow rate of 5 Q/min. The standard welding is 40-point welding.
第２図は、この発明の他の実施例を示している。この実
施例では、スリーブは使用しない。すなわち、被覆管２
と光フアイバ心線１との間に管状の高熱伝導率物質４を
挿入し、２本の被覆管２を接合部７で突合わせ周溶接す
る。FIG. 2 shows another embodiment of the invention. In this embodiment, no sleeve is used. That is, the cladding tube 2
A tubular high thermal conductivity material 4 is inserted between the optical fiber core 1 and the cladding tubes 2, and the two cladding tubes 2 are butted together at the joint 7 and circumferentially welded.
第３図は、溶接時の溶接点直下におけるピーク温度をア
ーク点ごとに示したものである。被覆管内の溶接点直下
に熱電対（クロメル−アルメル）を挿入して、温度を測
定した。また、室温の接合部にアークスポットを照射し
、ピーク温度に達すると同時に接合部を空気流で冷却し
、被覆管内が室温になるのを待って次の溶接点に移るま
でを１サイクルとし、全周について温度測定をな行った
。FIG. 3 shows the peak temperature immediately below the welding point during welding for each arc point. A thermocouple (chromel-alumel) was inserted into the cladding just below the welding point to measure the temperature. In addition, one cycle consists of irradiating an arc spot onto a joint at room temperature, cooling the joint with an air flow as soon as the peak temperature is reached, waiting for the inside of the cladding tube to reach room temperature, and moving on to the next welding point. Temperature measurements were taken around the entire circumference.
第３図において、従来法は第１図に示す状態で銅管４な
しで溶接した場合であり、点溶接は２３点１
で終γした。管内のピーク温度は、最高温度が９７℃、
最低温度が７２℃、平均８３．８℃であった。また、第
３図の本発明法は第１図に示す状態で、つまり銅管４を
使用して溶接した場合であり、点溶接は３６点で終了し
た。管内最高温度が６８℃、最低温度が４３℃、平均５
５．４℃であった。In FIG. 3, the conventional method is welding without the copper tube 4 in the state shown in FIG. 1, and spot welding was completed at 23 points 1. The peak temperature inside the tube is 97℃,
The lowest temperature was 72°C and the average was 83.8°C. Further, the method of the present invention shown in FIG. 3 is performed in the state shown in FIG. 1, that is, when welding was performed using the copper tube 4, and spot welding was completed at 36 points. Maximum temperature inside the tube is 68℃, minimum temperature is 43℃, average 5
The temperature was 5.4°C.
第３図より明らかなように、この発明によれば従来方法
よりも３０℃近く管内ピーク温度を引きＦげることがで
き、しかも７０℃以下の管内温度で溶接可能である。こ
れは短時間の許容限界温度の２００℃よりもはるかに低
く、かつ軟化もしくは溶融に関する安全温度の約８０℃
よりも低く、被覆管の溶接による光フアイバ心線の熱損
傷は避けられる。As is clear from FIG. 3, according to the present invention, the peak temperature inside the pipe can be lowered by nearly 30°C compared to the conventional method, and welding can be performed at an inside temperature of 70°C or less. This is much lower than the short-term permissible limit temperature of 200°C, and the safe temperature for softening or melting of about 80°C.
thermal damage to the optical fiber core due to welding of the cladding tube can be avoided.
したがって、本発明の接合部は光フアイバ素線に熱損傷
のない高品質の製品を保証し少なくとも溶接部における
伝送損失の増大は心配しなくてよくなった。Therefore, the joint of the present invention guarantees a high quality product without thermal damage to the optical fiber strands, and at least there is no need to worry about increased transmission loss at the weld.
［発明の効果］
この発明では、被覆管と光ファイバとの間に過 ２
熱緩和材を挿入して被覆管どうしを溶融溶接により接続
するので、光ファイバは許容限界温度以下かつ安全温度
以下に保持される。したがって、光ファイバは溶接時の
熱により損傷を受けることはなく、光ファイバの劣化に
よる伝送損失の増大を防止することができる。[Effects of the Invention] In this invention, a heat-reducing material is inserted between the cladding tube and the optical fiber, and the cladding tubes are connected by fusion welding, so that the optical fiber temperature is below the allowable limit temperature and below the safe temperature. Retained. Therefore, the optical fiber is not damaged by heat during welding, and an increase in transmission loss due to deterioration of the optical fiber can be prevented.
第１図（ａ）はこの発明による被覆管の接続方法を説明
するの斜視図、第１図（ｂ）は第１図（ａ）の正面図、
第２図はこの発明の詳細な説明する断面図、および第３
図は溶接時の管内ピーク温度をこの発明と従来法とを比
較して示すグラフである。
１・・・光フアイバ心線、２・・・金属製被覆管、３・
・・スリーブ、４・・・高熱伝導率物質、５・・・つば
、６・・・アーク照射方向、７・・・接合部、Ｗ ｏ
ｏ ： Ｗ ＋ ｏ ： Ｗ ２゜：Ｗ３ｏ−・・点溶
接位置。FIG. 1(a) is a perspective view illustrating the cladding pipe connection method according to the present invention, FIG. 1(b) is a front view of FIG. 1(a),
FIG. 2 is a sectional view explaining the invention in detail, and FIG.
The figure is a graph showing a comparison of the peak temperature inside the pipe during welding between the present invention and the conventional method. 1... Optical fiber core wire, 2... Metal cladding tube, 3...
...Sleeve, 4...High thermal conductivity material, 5...Brim, 6...Arc irradiation direction, 7...Joint part, W o
o: W + o: W 2°: W3o-...Spot welding position.
Claims (1)
た光ファイバコードまたはケーブルの被覆管どうしを溶
融溶接により接続する方法において、溶接部およびその
前後にわたって前記隙間に過熱緩和材を介在させて溶融
溶接することを特徴とする光ファイバコードまたはケー
ブルの金属製被覆管の接続方法。1. In a method of connecting the cladding tubes of optical fiber cords or cables inserted into optical fibers or metal cladding tubes with a gap therebetween by fusion welding, a desuperheating material is interposed in the gap at the welding part and before and after the welding part, and melting is performed. A method for connecting a metal cladding of an optical fiber cord or cable, characterized by welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1285031A JP2863222B2 (en) | 1989-11-02 | 1989-11-02 | Connection method for metal cladding of optical fiber cord or cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1285031A JP2863222B2 (en) | 1989-11-02 | 1989-11-02 | Connection method for metal cladding of optical fiber cord or cable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03146911A true JPH03146911A (en) | 1991-06-21 |
| JP2863222B2 JP2863222B2 (en) | 1999-03-03 |
Family
ID=17686262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1285031A Expired - Lifetime JP2863222B2 (en) | 1989-11-02 | 1989-11-02 | Connection method for metal cladding of optical fiber cord or cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2863222B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0690321A1 (en) * | 1994-06-27 | 1996-01-03 | Nkk Corporation | A method for connecting optical fiber cables |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59184313A (en) * | 1983-04-05 | 1984-10-19 | Fujikura Ltd | Formation of intermediate connecting part and terminal part of metallic coat optical fiber |
| JPH0192705A (en) * | 1987-10-05 | 1989-04-12 | Nippon Steel Weld Prod & Eng Co Ltd | Connecting part for optical fiber-contained metallic tube |
| JPH02142804U (en) * | 1989-05-08 | 1990-12-04 |
-
1989
- 1989-11-02 JP JP1285031A patent/JP2863222B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59184313A (en) * | 1983-04-05 | 1984-10-19 | Fujikura Ltd | Formation of intermediate connecting part and terminal part of metallic coat optical fiber |
| JPH0192705A (en) * | 1987-10-05 | 1989-04-12 | Nippon Steel Weld Prod & Eng Co Ltd | Connecting part for optical fiber-contained metallic tube |
| JPH02142804U (en) * | 1989-05-08 | 1990-12-04 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0690321A1 (en) * | 1994-06-27 | 1996-01-03 | Nkk Corporation | A method for connecting optical fiber cables |
| US5557697A (en) * | 1994-06-27 | 1996-09-17 | Nkk Corporation | Method for connecting optical fiber cables |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2863222B2 (en) | 1999-03-03 |
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