JPS6081039A - Method for making optical fiber drawing furnace airtight - Google Patents

Method for making optical fiber drawing furnace airtight

Info

Publication number
JPS6081039A
JPS6081039A JP18904683A JP18904683A JPS6081039A JP S6081039 A JPS6081039 A JP S6081039A JP 18904683 A JP18904683 A JP 18904683A JP 18904683 A JP18904683 A JP 18904683A JP S6081039 A JPS6081039 A JP S6081039A
Authority
JP
Japan
Prior art keywords
preform
furnace
sealing body
inert gas
optical fiber
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.)
Pending
Application number
JP18904683A
Other languages
Japanese (ja)
Inventor
Yoshiro Yamane
山根　喜朗
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 JP18904683A priority Critical patent/JPS6081039A/en
Publication of JPS6081039A publication Critical patent/JPS6081039A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/029—Furnaces therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C03B37/02736—Means for supporting, rotating or feeding the tubes, rods, fibres or filaments to be drawn, e.g. fibre draw towers, preform alignment, butt-joining preforms or dummy parts during feeding
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2205/00—Fibre drawing or extruding details
    • C03B2205/60—Optical fibre draw furnaces
    • C03B2205/80—Means for sealing the preform entry or upper end of the furnace
    • C03B2205/81—Means for sealing the preform entry or upper end of the furnace using gas

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To seal effectively a drawing furnace in a noncontact state while reducing the consumption of an inert gas by spouting the inert gas to float a ringlike sealing body having hollows and to seal the preform introducing hole. CONSTITUTION:In an optical fiber drawing furnace 1, the tip of a preform 6 made of quartz or other material is melted by heating with a heater 2, the diameter is reduced, and an optical fiber 8 is drawn from the bottom hole 5. A sealing body 12 through which the preform 6 is passed is placed on the top plate 3 of the furnace 1. The sealing body 12 is composed of a floating section 10 having a hollow 21, a promoting section 11 having a hollow 22, and a connecting section 15 for coupling the sections 10, 11 together. An inert gas introduced into the hollow 21 from the inlets 23 is spouted from the spouting holes 16, 17 to float the sealing body 12 and to seal the opening of the plate 3. Air or gas introduced into the hollow 22 from the inlets 24 under high pressure is spouted from the spouting holes 18 toward the preform 6 to promote the flotation of the sealing body 12 and to hold the preform 6 and the preform passing hole of the sealing body 12 in a coaxial state.

Description

【発明の詳細な説明】 イ、産業上の利用分野 この発明は光フアイバー線引炉においてプリフォームと
炉体間の気密を保ち、炉内の雰囲気を常に清浄に保持す
るための気密（シー）Ｌ／）方法の改良に関するもので
ある。Detailed Description of the Invention A. Field of Industrial Application This invention is an optical fiber drawing furnace that maintains airtightness between the preform and the furnace body and keeps the atmosphere inside the furnace clean at all times. L/) relates to improvement of the method.

口、従来技術 光ファイバーは石英等の祠料で製造したプリフォーム（
母材）を線引炉の上部より送入して先端を加熱溶融し、
該プリフォームの先端から引き出して細径化して光ファ
イバーとし線引炉の下方より引き出して製造する。この
場合線引炉内部は溶融さｔたプリフォームに対する空気
中の異物、酸素、水蒸気、金属イオン等の接触による光
ファイバーの機械的強度や性能の低下及び酸化によるヒ
ーター寿命の低下を防止するため常に不活性ガスが完調
さｎている必要がある。The conventional optical fiber is a preform made of abrasive material such as quartz (
The base material) is fed from the top of the drawing furnace and the tip is heated and melted.
The fiber is pulled out from the tip of the preform, reduced in diameter, and made into an optical fiber by being pulled out from the bottom of a drawing furnace. In this case, the inside of the drawing furnace is always kept in order to prevent the mechanical strength and performance of the optical fiber from decreasing due to contact with the molten preform by foreign substances, oxygen, water vapor, metal ions, etc. in the air, as well as from reducing the life of the heater due to oxidation. The inert gas must be in perfect condition.

従来の線引炉は第１図に示すよう炉体（１）の内部に炉
心管（９）の外側にヒーター（２）をもうけ、炉体（１
）の上面板（３）の孔からプリフォーム（６）をプリフ
ォームフィーター　Ｇ５１　Ｋよってゆっくりと降下さ
せる。As shown in Fig. 1, the conventional drawing furnace has a heater (2) inside the furnace body (1) and outside the furnace tube (9).
) The preform (6) is slowly lowered through the hole in the top plate (3) using a preform feeder G51K.

プリフォーム（６）の先端はヒーター（２）によって加
熱溶融され、光ファイバー（８）として炉体下面の孔（
５）から引き出されコーティング工程をへて巻き取らｎ
るようになっている。炉体内は不活性ガスによって充満
されているが、炉体（１）の上面板（３）の上部にプリ
フォーム（６）の外周に密着する孔を有するプラスチッ
ク製の気密板（４）を配置し、且つ気密板（４）と上面
板（３）の上面を接触させることによって炉体内部と外
部をシールするようにしている。プリフォームの真直性
と外径には公差があるので引き出される光ファイバー（
８）が常に線引炉（１）の中心に位置するようにプリフ
ォームフィーダーに）によってプリフォーム（６）を軸
に直角方向に微小屋の位置制御を行う必要があり、従っ
て気密板（４）はプリフォーム（６）の軸に直角方向に
移動可能となっている。The tip of the preform (6) is heated and melted by the heater (2), and the optical fiber (8) is inserted into the hole (
5) It is pulled out from the container, goes through a coating process, and is rolled up.
It has become so. The furnace body is filled with inert gas, and a plastic airtight plate (4) with holes that tightly fits around the outer periphery of the preform (6) is placed on top of the top plate (3) of the furnace body (1). Moreover, the inside and outside of the furnace body are sealed by bringing the airtight plate (4) and the upper surface of the top plate (3) into contact with each other. There are tolerances for the straightness and outer diameter of the preform, so the optical fiber that is drawn out (
It is necessary to control the position of the microshelf in the direction perpendicular to the axis of the preform (6) by means of the preform feeder so that the plate (8) is always located at the center of the drawing furnace (1). ) is movable in a direction perpendicular to the axis of the preform (6).

ところが上記従来の方法では気密板（４）が上面板（３
）と接触し横方向の移動抵抗が大きく且つ気密板（４）
が１リフオーム（６）が常に接触しているためグリフオ
ーム（６）の通人中に外面にわずがな外傷が発生し、そ
扛が原因となって線引きしてファイバー化した後の光フ
ァイバーの引張強度の低下をまねく欠点がある。However, in the above conventional method, the airtight plate (4) is connected to the top plate (3).
) and has a large lateral movement resistance and is airtight (4)
However, since the 1-reform (6) is in constant contact, slight damage occurs to the outer surface of the re-form (6) during passing, and this damage causes damage to the optical fiber after it has been drawn and made into a fiber. It has the disadvantage of decreasing tensile strength.

こ扛に対し気密板（４）とプリフォーム（６）の外周を
非接縁上しながら別の不活性ガスを使用して炉内の雰囲
気を不活性ガスに保持するシール方法が提案されている
が、いずれも不活性ガスの消費量が大きくコスト高とな
る欠点がある。For this purpose, a sealing method has been proposed in which the outer peripheries of the airtight plate (4) and the preform (6) are not in contact with each other, and another inert gas is used to maintain the atmosphere in the furnace at an inert gas level. However, both have the drawback of high consumption of inert gas and high cost.

ハ９発明の目的 この発明はプリフォームの外面に傷を生じない非接触型
のガスシール方法を用い、且つ不活性ガスの消費量を節
減し線引き作業中のプリフォームの外傷を防止しながら
線引きのコストを低下させ従来方法の欠点を解消するこ
とを目的とする。C.9 Purpose of the Invention This invention uses a non-contact gas sealing method that does not cause damage to the outer surface of the preform, reduces the consumption of inert gas, and prevents damage to the preform during wire drawing. The purpose is to reduce the cost and eliminate the drawbacks of conventional methods.

二９発明の開示 この発明は第２図に示すように光フアイバー線引炉にプ
リフォームをフィードする場合、線引炉（１）の上面板
【３）の上に浮遊部叫と推進部（Ｉｌｌを接続部品（１
５）によって結合したシール体０２１を配置し、不活性
ガスによってシール体を浮遊させ且つ推進部のプリフォ
ーム通過孔の内面から高圧の空気もしくはガスを噴出せ
しめてその自動調心作用により常にシール体のプリフォ
ーム通過孔をプリフォームと同軸に保持して、該通過孔
とプリフォームの外面を非接触状態に保つと共に前記不
活性ガスにより炉内を外部雰囲気とシール（気密）する
光フアイバー線引炉の気密方法である。29 DISCLOSURE OF THE INVENTION As shown in FIG. Ill connect parts (1
5), the seal body 021 is placed, and the seal body is suspended by an inert gas, and high-pressure air or gas is ejected from the inner surface of the preform passage hole of the propulsion section, so that the seal body is always maintained due to its self-aligning action. Optical fiber drawing that holds the preform passage hole coaxially with the preform to keep the passage hole and the outer surface of the preform in a non-contact state, and seals (airtight) the inside of the furnace with the external atmosphere using the inert gas. This is a method of sealing the furnace.

ホ、実施例 以下図面を用いて本発明を実施例により更に詳細に説明
する。E. Examples Hereinafter, the present invention will be explained in more detail with reference to the drawings.

実施例　１ 第３図は第２図の本発明の実施例を示すもので、第２図
のＡ部の詳細断面図である。又第５図、第６図はそｎぞ
れ本実施例のシール体の具体的構造を示す部分断面平面
図、正面断面図である。線引炉（１）の構造は従来の線
引炉と同様であり、図面の部品番号は第２図のものと同
じである。本実施例においてはシール体α２は空洞のリ
ング状の浮遊部ＣＩ□と推進部（Ｉｌｌを接続部品α９
によって結合したものであり、そｎらの中心部の孔をプ
リフォーム（６）が通過するようになっている。浮遊部
ＯＱには不活性ガスの送入Ｌ１（ホ）がもうけられ、ガ
スホース（１９）から不活性ガスが浮遊部０１の空洞部
の）に送入されるようになっている。又浮遊部αＱには
底面に空洞部２ｎと連結するガヌ噴出口ｕ印が、又プリ
フォーム（６）の通過孔の内面に同様に空洞部（２１）
と連結するガス噴出口（１７１が周辺に均等にもうけら
れている。推進部０１）には空気送入口（２４）がもう
けらｎ、ガスホース００）がら空気が推進部Ｇｌｌの空
洞部２２）に送入されるようＫｆｚっている。又推進部
０１）にはプリフォーム（６）ノ通過孔の内面に空洞部
（２２１と連結する空気噴出口（１８）が周辺に均一に
もうけられている。Embodiment 1 FIG. 3 shows an embodiment of the present invention shown in FIG. 2, and is a detailed sectional view of section A in FIG. 2. 5 and 6 are a partial sectional plan view and a front sectional view, respectively, showing the specific structure of the seal body of this embodiment. The structure of the drawing furnace (1) is similar to a conventional drawing furnace, and the part numbers in the drawing are the same as those in FIG. In this embodiment, the seal body α2 connects the hollow ring-shaped floating part CI□ and the propulsion part (Ill) with the part α9.
The preform (6) passes through the hole in the center of the two. An inert gas feed L1 (e) is provided in the floating part OQ, and the inert gas is fed into the hollow part of the floating part 01 from a gas hose (19). In addition, the floating part αQ has a Ganu jet nozzle u mark connected to the cavity 2n on the bottom surface, and a cavity (21) on the inner surface of the passage hole of the preform (6).
Gas outlets (171) connected to the propulsion unit 01 are provided evenly around the periphery.An air inlet port (24) is provided in the propulsion unit 01, and air is supplied from the gas hose 00) to the cavity 22) of the propulsion unit Gll. Kfz to be sent. Further, in the propulsion section 01), air jet ports (18) connected to the cavity section (221) are provided uniformly around the inner surface of the passage hole of the preform (6).

この構造のシール体（Ｉａを第３図に示すように線引炉
（１）の上面板（３）の」二に配置しプリフォーム（６
）をシール体（１２の孔の中を通過させる。そうすると
不活性ガスはガスホース（」９から浮遊部ＯＱの空洞部
２１）に送入され、底面の噴出Ｏｆ１６１及び通過孔の
内面の噴出口（１７１から噴出し、図面の矢印イ、口、
ハの方向に流出する。この圧力によってシール体（抑は
線引炉の上面板（３）から僅かの量だけ浮上させら扛シ
ーｐ体０２）の横方向の移動に対する抵抗は極小になる
。さらに不活性ガスの流れがイ」近の空気を排除し炉内
への空気の流入を防止して完全なシールがさ扛且つ炉内
の不活性ガスによる充満が保持される。一方ガヌホース
（２０）からは高圧空気が推進部（１１）の空洞部Ｃ２
）に送入さ扛プリフォームの通過孔の内面の噴出口０８
）から噴出し、図面の矢印二、ホの方向に流出する。こ
の場合矢印二の方向への空気の流れは浮遊部ＧＯからの
図中の不活性ガスの矢印への流れと合流して炉外に排出
さｎるので空気の炉内への浸入は防止される。プリフォ
ーム（６）と推進部０１）の通過孔との間には噴出口（
１８）から噴出した空気によって高圧部分が形成さ汎、
この高圧部分はグリフオーム（６）と通過孔との接触を
防ぐと共に推進部（Ｌｌ＋に自動調心作用を生ずる。即
ち第４図に示すようにプリフォーム（６）がフィーダー
の位置制御動作によって推進部の通過孔と図面の矢印の
方向に偏心を生ずると推進部とプリフォームの隙間の右
側（１３）の圧力は左側の圧力より高くなる。推進部０
１）と浮遊部ａＱは連結され且つシール体は前記のよう
に浮遊しているのでシール体（１２１は全体としてこの
圧力差によって素早く第４図の右方向に移動し全体とし
てプリフォーム（６）と同心の位置に移動する。The sealing body (Ia) of this structure is placed on the top plate (3) of the drawing furnace (1) as shown in Figure 3.
) is passed through the hole in the sealing body (12).Then, the inert gas is fed from the gas hose ('9 to the cavity 21 of the floating part OQ), and the inert gas is passed through the gas hose ('9) into the cavity part 21 of the floating part OQ, and the inert gas is passed through the jet hole Of161 on the bottom and the jet port ( Spouting from 171, arrow A in the drawing, mouth,
It flows out in the direction of H. This pressure minimizes the resistance to the lateral movement of the sealing body (the sealing body 02 which is floated by a small amount from the top plate (3) of the drawing furnace). Additionally, the flow of inert gas eliminates air in the vicinity of the furnace and prevents air from entering the furnace, creating a complete seal and maintaining the furnace filled with inert gas. On the other hand, high pressure air is supplied from the Ganu hose (20) to the cavity C2 of the propulsion section (11).
) The spout 08 on the inner surface of the passage hole of the comb preform fed into
) and flows out in the direction of arrows 2 and 5 in the drawing. In this case, the air flow in the direction of arrow 2 merges with the flow of inert gas from the floating part GO in the direction of the arrow in the figure and is discharged outside the furnace, preventing air from entering the furnace. Ru. There is a spout (
18) A high pressure area is formed by the air blown out from the
This high-pressure part prevents contact between the glyform (6) and the passage hole, and also produces a self-aligning effect on the propelling part (Ll+. In other words, the preform (6) is propelled by the position control operation of the feeder, as shown in Fig. 4. If eccentricity occurs in the direction of the passage hole of the part and the arrow in the drawing, the pressure on the right side (13) of the gap between the propelling part and the preform will be higher than the pressure on the left side.Propelling part 0
1) and the floating part aQ are connected, and the seal body is floating as described above, the seal body (121) as a whole quickly moves to the right in FIG. 4 due to this pressure difference, and the whole preform (6) Move to a position concentric with

従ってこの方法によ扛ば線引炉の気密をたもちながら、
シール体（１２）の通過孔とプリフォーム（６）を常に
同軸に保持して非接触にたもつことができる。Therefore, by using this method, while maintaining the airtightness of the drawing furnace,
The passage hole of the seal body (12) and the preform (6) can always be held coaxially and without contact.

一般にプリフォーム（６）の外径は公差が大きく非接触
状態を保持するにはシール体の通過孔とプリフォームの
外径上の隙間は約０．５　ｍｍ以上と大きくする必要が
ある。従って充分な自動調心作用を得るためには大量の
ガスを必要とするが、本発明の方法によれば浮遊部Ｑｔ
）と推進部０１）が分離さ扛ているので、浮遊部による
ガスシールのための不活性ガスは小量で充分であり、一
方推進部には安価な空気を大量に使用して前記自動調心
作用を確実に且つコスト安で実現することができる。Generally, the outer diameter of the preform (6) has a large tolerance, and in order to maintain a non-contact state, the gap between the passage hole of the seal body and the outer diameter of the preform must be as large as about 0.5 mm or more. Therefore, a large amount of gas is required to obtain sufficient self-aligning action, but according to the method of the present invention, the floating portion Qt
) and the propulsion section 01) are separated, so a small amount of inert gas is sufficient for gas sealing by the floating section, while a large amount of cheap air is used in the propulsion section to perform the automatic adjustment. Cardiac action can be achieved reliably and at low cost.

この場合浮遊部ｏ１及び推進部Ｇｌｌの空洞部２１＋　
、　（２，）の断面積は円周方向に一様にし、史にガス
噴出が均一に行わ！するようにガス噴出口の面積より十
分大きくすることが望ましい。またガスの噴出を均一に
するため浮遊部叫、推進部（ＩＩ）へのガスの送入口を
円周上に複数個もうけ、ガスホースを複数本、多方向か
ら浮遊部、推進部の空洞部に送入して噴出ガスの周方向
の均一化を図ることもできる。また以上は推進に用いる
ガスとして空気を用いる場合を説明したが、空気以外に
安価なガス、例えば窒素ガス等も使用できることは勿論
である。In this case, the floating part o1 and the cavity part 21+ of the propulsion part Gll
, The cross-sectional area of (2,) is made uniform in the circumferential direction, so that the gas is ejected evenly! It is desirable that the area be sufficiently larger than the area of the gas ejection port. In order to make the gas eject uniform, multiple gas inlets to the floating part and the propulsion part (II) are provided on the circumference, and multiple gas hoses are connected from multiple directions to the cavities of the floating part and the propulsion part. It is also possible to uniformize the ejected gas in the circumferential direction by feeding it. Moreover, although the case where air is used as the gas used for propulsion has been described above, it is of course possible to use inexpensive gases other than air, such as nitrogen gas.

実施例　２ 第７図は本発明の他の実施例を示す断面図である。即ち
シール体（１りは浮遊部叫と推進部Ｇｌｌとを接続部品
０５１を用いて結合したものであることは実施例１の場
合と同様である。浮遊部（１０にはその通過孔の内面に
空洞部に連結した噴出口（１７１をもうけ、推進部（１
１）にも同様に通過孔の内面に噴出口（１８）がもうけ
らｎている。一方線引炉の上面板（３）は空洞になって
おり、該空洞部例と連結して」二面板（３）の上面にガ
ス噴出口筒が円周上に配置してもうけら扛ており、不活
性ガスが上面板（３）から浮遊部ａＱに対して噴出する
ようになっている。Embodiment 2 FIG. 7 is a sectional view showing another embodiment of the present invention. That is, the sealing body (10 is the same as the case of Example 1 in that the floating part 10 is connected to the propulsion part Gll using the connecting part 051. The floating part (10 has the inner surface of its passage hole It has a spout (171) connected to the cavity, and a propulsion part (171) connected to the cavity.
1) also has a spout (18) on the inner surface of the passage hole. On the other hand, the top plate (3) of the drawing furnace is hollow, and connected to the hollow part, gas jet nozzles are arranged circumferentially on the top surface of the two-face plate (3). Therefore, inert gas is ejected from the top plate (3) toward the floating portion aQ.

このシール体Ｏ２を炉の上面板１３）の上に配置して」
−面板１３）の空洞部（２１ｉ）と浮遊部０１の空洞部
ｃ！１）に不活性ガスを送入すると不活性ガスは噴出口
から噴出して第７図の矢印イ、口、ハの方向に流汎る。Place this seal body O2 on the top plate 13) of the furnace.
- Cavity part (21i) of face plate 13) and cavity c of floating part 01! When inert gas is fed into 1), the inert gas is ejected from the ejection port and spreads in the directions of arrows A, C, and C in FIG.

即ち上面板（３）の上面の噴出口（イ）からのガスによ
って、シール体（］２）は上面板（３）から浮遊する。That is, the seal body (2) is suspended from the top plate (3) by the gas from the jet port (a) on the top surface of the top plate (3).

このガス及び噴出口＋１７１からのガスはイ、口、へ方
向に流れて炉内を完全にシールする。一方実施例１と同
様に推進部Ｇｌｌには高圧の空気が送入され、噴出口（
Ｉ８）から噴出して図面の矢印二、ホの方向に流扛てシ
ール体（１２に自動調心作用を生じ、且つこの空気は浮
遊部（１０の噴出１コ０ηからの不活性ガスの流扛ハと
混合して炉外に排出される。この方法によっても実施例
１と同様の効果が得られることは明らかである。This gas and the gas from the ejection port +171 flow in the direction of A and I, completely sealing the inside of the furnace. On the other hand, similarly to Embodiment 1, high-pressure air is fed into the propulsion section Gll, and the ejection port (
I8), the air flows in the directions of arrows 2 and E in the drawing, causing a self-aligning effect on the sealing body (12), and this air flows into the floating part (10 jets 1 and 0η of the inert gas flow). It is mixed with the powder and discharged outside the furnace.It is clear that the same effect as in Example 1 can be obtained by this method as well.

実施例　３ 第８図はさらに本発明の他の実施例を示す断面図である
。シール体（１２）は浮遊部σＱと推進部（Ｈｌとを接
続部品（１５）を用いて結合したものであることは前記
実施例と同様である。この場合浮遊部ａｃｈは空洞であ
り、その下面に不活性ガスの噴出口止がもうけらｎ１推
進部Ｏ１ｌは空洞であり、推進部０Ｄのプリフォーム（
６）の通過孔の内面に空洞と連結した噴出口Ｑ８）がも
うけられている。Embodiment 3 FIG. 8 is a sectional view showing another embodiment of the present invention. The seal body (12) is the same as the above embodiment in that the floating part σQ and the propulsion part (Hl) are connected using the connecting part (15). In this case, the floating part ach is hollow, and its The n1 propulsion section O1l is hollow with an inert gas jet stop provided on the lower surface, and the preform of the propulsion section 0D (
A spout Q8) connected to the cavity is provided on the inner surface of the passage hole 6).

この構造のシール体１２＋を炉体の上面板（３）の上に
配置して、浮遊部ＱＱの空洞部ｃ！１）に不活性ガスを
送入すると不活性ガスは噴出口（１６）から噴出して図
面の矢印イ、ハの方向に流ｎるが、その圧力によって浮
遊部（１０従ってシール体（Ｉ２）全体は炉の上面板（
３）かられずかに浮遊させらｎる。又一般に線引炉は不
活性ガスで充満し且つ高温であるのでガスの浮力によっ
て炉内のガスは上昇しようとし、図面の口の方向のガス
の流れが生じ、この流れは不活性ガスのハ方向の流れと
混合して付近の空気を排除し炉を完全に外気とシールす
る。一方推進部０１）の空洞部Ｃ２には高圧の空気が送
入さｎ、空気は噴出口止から噴出して図面の矢印二、ホ
の方向に流れ推進部０１）即ちシール体（１２に対して
自動調心作用が行わ扛る。空気の二方向の流れは不活性
ガスの）＼方向の流れと混合して炉外に排出されるので
、空気が炉内に浸入することはない。この構造のシール
体を用いても前記実施例と同様の効果をゆうするもので
ある。The seal body 12+ having this structure is placed on the top plate (3) of the furnace body, and the cavity c! When inert gas is fed into 1), the inert gas is ejected from the ejection port (16) and flows in the direction of arrows A and C in the drawing, but the pressure causes the floating part (10 and therefore the sealing body (I2) The entire top plate of the furnace (
3) Do not let it float in the air. Generally, a drawing furnace is filled with inert gas and is at a high temperature, so the gas inside the furnace tends to rise due to the buoyancy of the gas, causing a flow of gas in the direction of the mouth of the drawing, and this flow is caused by the inert gas flow. It mixes with the directional flow to exclude nearby air and completely seal the furnace from outside air. On the other hand, high-pressure air is fed into the cavity C2 of the propulsion section 01), and the air is ejected from the jet nozzle stop and flows in the directions of arrows 2 and 1 in the drawing, relative to the seal body (12). The two-way flow of air mixes with the direction of inert gas flow and is discharged outside the furnace, so that no air enters the furnace. Even if a seal body having this structure is used, the same effects as in the above embodiment can be achieved.

へ８発明の効果 以上に詳しく説明したように本発明は光フアイバー線引
炉においてプリフォームを供給する入口の気密方法にお
いて、浮遊部と推進部を接続部品で結合したシール体を
用いて、不活性ガスの作用により浮遊部によってシール
体を浮遊せしめてシール体の横方向への移動抵抗を極小
にすると共に気密を保持し、さらに推進部において安価
な高圧ガスを用いてその自動調心作用により常にシール
体のプリフォーム通過孔とプリフォームを同心に保持す
るようにしたものであり、非接触で死金な力゛ヌシール
ができる。従ってシールによるプリフォームの外傷を防
止し良好な性能の光ファイノく−を得ることができると
共に従来の非接触型のシール方法に比し自動調心用のガ
スとして安価をガスを用いることができコスト安で完全
な気密を保持することができる有効な気密方法である。8. Effects of the Invention As explained in detail above, the present invention is a method for air-tightening the entrance for supplying preforms in an optical fiber drawing furnace, by using a sealing body in which a floating part and a propelling part are connected by a connecting part. The seal body is suspended by the floating part by the action of the active gas, minimizing the resistance to the seal body's lateral movement and maintaining airtightness.Furthermore, by using an inexpensive high-pressure gas in the propulsion part, its self-aligning action allows the seal body to float. The preform passage hole of the seal body and the preform are always held concentrically, allowing for a non-contact and powerful seal. Therefore, it is possible to prevent damage to the preform due to sealing and obtain an optical fiber with good performance, and it is also possible to use a cheaper gas as a self-aligning gas than in the conventional non-contact sealing method. This is an effective airtight method that can maintain complete airtightness at low cost.

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

第１図は従来の光フアイバー線引炉の断面図であり、第
２図は本発明の線引炉の気密方法を示す断面図、第４図
はその自動調心作用を説明する１３−Ｂ断面図である。 第３図、第７図、第８図は本発明の実施例において第２
図のＡ部の詳細を示す断面図であ。す、第５図ぼ抛３図
の実施例に用いるシール体の部分断面平面図、第６図は
その正面断面図である。 （１）・・・線引炉、＋２）・・・ヒーター、（３）・
・・上面板、　（４）・・・気密板、（５）・・・孔、
　（６）・・・プリフォーム、（８）・・・光ファイバ
ー、　（９）・・・炉心管、ＱＱ・・・浮遊部、　■・
・・推進部、（１渇・・・シール体、　（１３１、ｔｌ
ト・隙間、（１ω・・・接続部品、　（Ｉυ、　［１７
１、（１８１、菫・−・噴出口、（１９１，囚）・・・
ガスホース、盟１．（２２１，■−・空洞部、（ト）、
（至）・・・送入口、（ハ）・・・フィーダー。 弁理士田中理夫Fig. 1 is a cross-sectional view of a conventional optical fiber drawing furnace, Fig. 2 is a cross-sectional view showing the airtight method of the drawing furnace of the present invention, and Fig. 4 is a 13-B illustrating its self-aligning action. FIG. FIGS. 3, 7, and 8 show the second embodiment of the present invention.
FIG. 3 is a sectional view showing details of section A in the figure. FIG. 5 is a partially sectional plan view of the seal body used in the embodiment shown in FIG. 3, and FIG. 6 is a front sectional view thereof. (1)...Drawing furnace, +2)...Heater, (3)...
...Top plate, (4)...Airtight plate, (5)...Hole,
(6)... Preform, (8)... Optical fiber, (9)... Furnace tube, QQ... Floating part, ■.
...propulsion section, (1 thirst...seal body, (131, tl
gap, (1ω...connection parts, (Iυ, [17
1, (181, Violet... spout, (191, prisoner)...
Gas hose, alliance 1. (221, ■-・Cavity part, (g),
(to)...inlet, (c)...feeder. Patent attorney Rio Tanaka

Claims (5)

【特許請求の範囲】[Claims] （１）光フアイバー線引炉のプリフォーム導入孔の気密
方法において、空洞を有するリング状体の浮遊部及び推
進部を接続部品によって結合したシール体を線引炉の上
面板の上に配置し、不活性ガスによってシール体を浮遊
せしめ且つ該不活性ガス流によって炉をシールすると共
に推進部のプリフォーム通過孔の内面より高圧の空気も
しくはガスを噴出せしめてその自動調心作用により常に
プリフォームとシール体のプリフォーム通過孔を同軸に
保持することを特徴とする非接触シール体による光フア
イバー線引炉の気密方法。(1) In a method for air-tightening the preform introduction hole of an optical fiber drawing furnace, a sealing body in which a floating part and a propulsion part of a ring-shaped body having a cavity are connected by a connecting part is placed on the top plate of the drawing furnace. , the sealing body is suspended by an inert gas, the furnace is sealed by the flow of the inert gas, and high-pressure air or gas is ejected from the inner surface of the preform passage hole in the propulsion section, and its self-aligning action always keeps the preform in check. An airtight method for an optical fiber drawing furnace using a non-contact sealing body, characterized in that a preform passage hole of the sealing body and a preform passage hole are held coaxially. （２）浮遊部の下面及びプリフォーム通過孔の内面から
不活性ガスを噴出せしめることによってシール体を浮遊
せしめ且つ炉をシールすることを特徴とする特許請求の
範囲第１項記載の非接触シール体による光フアイバー線
引炉の気密方法。(2) A non-contact seal according to claim 1, characterized in that the seal body is made to float and the furnace is sealed by jetting inert gas from the lower surface of the floating portion and the inner surface of the preform passage hole. Airtight method of optical fiber drawing furnace by body. （３）線引炉の上面板に空洞及び該空洞と連結する噴出
口を上面板の上面にもつげ、浮遊部のプリフォーム通過
孔の内面に噴出口をもうけて前記両噴出口より不活性ガ
スを噴出せしめてシール体を浮遊せしめ且つ炉をシール
することを特徴とする特許請求の範囲第１項記載の非接
触シール体による光フアイバー線引炉の気密方法。(3) A cavity and a jet nozzle connected to the cavity are provided on the top plate of the drawing furnace, and a jet nozzle is provided on the inner surface of the preform passage hole in the floating part, and the jet nozzle is inert from both of the jet nozzles. A method for airtightening an optical fiber drawing furnace using a non-contact sealing body according to claim 1, characterized in that the sealing body is made to float by blowing out gas and the furnace is sealed. （４）浮遊部の下面に噴出口をもうけ、該噴出口より不
活性ガスを噴出してシール体を浮遊すると共に該不活性
ガスの流扛と炉内から流出する不活性ガスの流れによっ
て炉をシールすることを特徴とする特許請求の範囲第１
項記載の非接触シール体による光フアイバー線引炉の気
密方法。(4) A spout is provided on the lower surface of the floating part, and an inert gas is spouted from the spout to float the sealing body, and the inert gas and the flow of the inert gas flowing out from inside the furnace are used to create a furnace. Claim 1 characterized in that the
A method for air-tightening an optical fiber drawing furnace using a non-contact sealing body as described in 2. （５）　高圧ガスとして空気を用いることを特徴とする
特許請求の範囲第１項乃至第４項いず牡かに記載の非接
触シール体による光ファイバ−線引炉の気密方法。(5) A method for air-tightening an optical fiber drawing furnace using a non-contact sealing body according to any one of claims 1 to 4, characterized in that air is used as the high-pressure gas.
JP18904683A 1983-10-07 1983-10-07 Method for making optical fiber drawing furnace airtight Pending JPS6081039A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18904683A JPS6081039A (en) 1983-10-07 1983-10-07 Method for making optical fiber drawing furnace airtight

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18904683A JPS6081039A (en) 1983-10-07 1983-10-07 Method for making optical fiber drawing furnace airtight

Publications (1)

Publication Number Publication Date
JPS6081039A true JPS6081039A (en) 1985-05-09

Family

ID=16234381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18904683A Pending JPS6081039A (en) 1983-10-07 1983-10-07 Method for making optical fiber drawing furnace airtight

Country Status (1)

Country Link
JP (1) JPS6081039A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050351A1 (en) * 1999-02-26 2000-08-31 Corning Incorporated Method and apparatus for sealing the top of a furnace for drawing optical fibre from a preform
FR2802916A1 (en) * 1999-12-27 2001-06-29 Cit Alcatel PREFORM INPUT ARRANGEMENT FOR FIBER OPTIC DRAWING OVEN, OVEN HAVING SUCH ARRANGEMENT AND PREFORM EQUIPPED TO COOPERATE WITH THIS ARRANGEMENT

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050351A1 (en) * 1999-02-26 2000-08-31 Corning Incorporated Method and apparatus for sealing the top of a furnace for drawing optical fibre from a preform
FR2802916A1 (en) * 1999-12-27 2001-06-29 Cit Alcatel PREFORM INPUT ARRANGEMENT FOR FIBER OPTIC DRAWING OVEN, OVEN HAVING SUCH ARRANGEMENT AND PREFORM EQUIPPED TO COOPERATE WITH THIS ARRANGEMENT
EP1112978A1 (en) * 1999-12-27 2001-07-04 Alcatel Preform entry device for an optical fibre draw furnace and draw furnace comprising said entry device
US6993937B2 (en) 1999-12-27 2006-02-07 Alcatel Preform inlet arrangement for an optical fiber drawing furnace, a furnace provided with that kind of inlet arrangement, and a preform equipped to co-operate with that inlet arrangement

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