JP3465554B2 - Glass rod processing burner and glass rod processing method - Google Patents
Glass rod processing burner and glass rod processing methodInfo
- Publication number
- JP3465554B2 JP3465554B2 JP26835097A JP26835097A JP3465554B2 JP 3465554 B2 JP3465554 B2 JP 3465554B2 JP 26835097 A JP26835097 A JP 26835097A JP 26835097 A JP26835097 A JP 26835097A JP 3465554 B2 JP3465554 B2 JP 3465554B2
- Authority
- JP
- Japan
- Prior art keywords
- burner
- glass rod
- oxygen
- hydrogen
- sectional area
- 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 - Lifetime
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
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/02—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a discontinuous way
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光ファイバの製造
工程において、ガラスロッドの曲がり修正や火炎研磨、
あるいは、ガラスロッドへのダミーガラスロッドの溶着
を行うガラスロッドの加工方法、及び、これに用いられ
るガラスロッド加工用バーナに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to glass fiber bending correction, flame polishing, and
Alternatively, the present invention relates to a glass rod processing method for welding a dummy glass rod to a glass rod, and a glass rod processing burner used therefor.
【０００２】[0002]
【従来の技術】光ファイバの製造工程において、ガラス
ロッドの曲がり修正や火炎研磨、あるいは、ガラスロッ
ドへのダミーロッドの溶着といったガラスロッドの加工
に用いられる従来のバーナとして、特開平４−２９２４
３２号公報従来の技術欄に記載されたものが知られてい
る。図２はこの従来のバーナ構造を示したもので、真円
形状の水素噴出口１中に多数の酸素噴出口２がほぼ均等
間隔で配列された構造である。2. Description of the Related Art In a manufacturing process of an optical fiber, as a conventional burner used for processing a glass rod, such as bending correction of a glass rod, flame polishing, or welding a dummy rod to a glass rod, a conventional burner is disclosed in Japanese Patent Application Laid-Open No. 4-2924.
The publication described in the conventional art column is known. FIG. 2 shows this conventional burner structure, which is a structure in which a large number of oxygen ejection ports 2 are arranged in a hydrogen ejection port 1 having a perfect circular shape at substantially equal intervals.
【０００３】[0003]
【発明が解決しようとする課題】光ファイバの低コスト
化、生産量増大に対する要求から、光ファイバ母材等の
ガラスロッドの大型化が望まれている。大型のガラスロ
ッドを加工するため、バーナーを相似的に大型化してい
くと、それに伴ってガス使用量を多くする必要がある。
その結果、ガス費が増大し、また、ガラスロッドの周辺
設備も同時に加熱されてしまうため、設備の耐熱性が問
題になる等、従来技術の延長線上では解決できない問題
が生じる。本発明は、このような実状に鑑みて、新たな
形状のガラスロッド加工用バーナーとそれに適したガス
の流しかたを開示するものである。Due to the demand for cost reduction and increase in production of optical fibers, it is desired to increase the size of glass rods such as optical fiber preforms. In order to process a large glass rod, if the burner is similarly enlarged, it is necessary to increase the amount of gas used.
As a result, the gas cost increases and the peripheral equipment of the glass rod is also heated at the same time, which causes a problem that the heat resistance of the equipment becomes a problem, which is a problem that cannot be solved by an extension of the conventional technology. In view of such circumstances, the present invention discloses a burner for processing a glass rod having a new shape and a gas flow method suitable for the burner.
【０００４】[0004]
【課題を解決するための手段】本発明にかかるガラスロ
ッド加工用バーナは、水素噴出口中に、１個若しくは複
数個の酸素噴出口が配置され、前記酸素噴出口の断面積
の総和が前記水素噴出口の断面積の２％以上１０％以下
であることを特徴とする。また、本発明にかかるガラス
ロッドの加工方法は、前記ガラスロッド加工用バーナを
用い、前記酸素噴出口におけるガス流速を２０ｍ／ｓ以
上１００ｍ／ｓ以下、前記水素噴出口におけるガス流速
を０．５ｍ／ｓ以上２０ｍ／ｓ以下とすることを特徴と
する。In the burner for processing a glass rod according to the present invention, one or a plurality of oxygen jets are arranged in the hydrogen jet, and the sum of the cross-sectional areas of the oxygen jets is the hydrogen. It is characterized by being 2% or more and 10% or less of the cross-sectional area of the ejection port. Further, a glass rod processing method according to the present invention uses the burner for processing a glass rod, a gas flow velocity at the oxygen jet port is 20 m / s or more and 100 m / s or less, and a gas flow velocity at the hydrogen jet port is 0.5 m. / S or more and 20 m / s or less.
【０００５】[0005]
【発明の実施の形態】ガラスロッドを効率よく加熱する
ためには、酸素と水素の流量比を反応の当量（１：２）
に依存する適正範囲にすること、及び、火炎をガラスロ
ッドに集中させることが必要である。発明者が後者の点
について検討を行ったところ、分子量が水素に比べて大
きい酸素の噴出口での流速を大きくすることにより、火
炎がガラスロッドに集中し、少ないガス使用量でガラス
ロッドを効率よく加熱できることが判明した。BEST MODE FOR CARRYING OUT THE INVENTION In order to efficiently heat a glass rod, the flow ratio of oxygen and hydrogen is set to the reaction equivalent (1: 2).
It is necessary to have a proper range depending on the above and to concentrate the flame on the glass rod. When the inventor investigated the latter point, the flame was concentrated on the glass rod by increasing the flow velocity at the oxygen outlet having a larger molecular weight than hydrogen, and the glass rod was efficiently used with a small amount of gas. It turns out that it can be heated well.
【０００６】本発明にかかるガラスロッド加工用バーナ
は、図１に示すように、水素噴出口１中に、１個若しく
は複数個の酸素噴出口２が配置され、酸素噴出口の断面
積の総和が水素噴出口の断面積の２％以上１０％以下で
あることを特徴とする。上記の構成によれば、酸素噴出
口２の断面積は比較的小さいので、酸素流量を多くせず
とも酸素噴出口での酸素流速を大きくできる。その結
果、火炎はガラスロッドに向かって集中して流れるよう
になり、ガラスロッドを効率よく加熱できる。As shown in FIG. 1, the burner for processing a glass rod according to the present invention has one or a plurality of oxygen jets 2 arranged in a hydrogen jet 1 and has a total cross-sectional area of the oxygen jets. Is 2% or more and 10% or less of the cross-sectional area of the hydrogen ejection port. According to the above configuration, since the oxygen jet port 2 has a relatively small cross-sectional area, the oxygen flow rate at the oxygen jet port can be increased without increasing the oxygen flow rate. As a result, the flame is concentrated and flows toward the glass rod, and the glass rod can be efficiently heated.
【０００７】本発明にかかるガラスロッド加工用バーナ
として、酸素噴出口がバーナ中心軸上の１点を指向する
構造とすることができる。これにより、火炎がバーナの
中心軸上に一層集中するので、ガラスロッドをより効率
的に加熱することができる。The burner for processing a glass rod according to the present invention may have a structure in which the oxygen jet port is directed to one point on the central axis of the burner. As a result, the flame is further concentrated on the central axis of the burner, so that the glass rod can be heated more efficiently.
【０００８】本発明にかかるガラスロッドの加工方法
は、酸素噴出口の断面積の総和が水素噴出口の断面積の
２％以上１０％以下であるガラスロッド加工用バーナを
用い、酸素噴出口におけるガス流速を２０ｍ／ｓ以上１
００ｍ／ｓ以下、水素噴出口におけるガス流速を０．５
ｍ／ｓ以上２０ｍ／ｓ以下とすることを特徴とする。上
記の構成によれば、火炎がガラスロッドに集中し、ガラ
スロッドを効率よく加熱できる。また、火炎が必要以上
に大きくならず、周辺設備に悪影響を与えることが少な
い。なお、水素噴出口のノズル出口におけるガス流速は
５ｍ／ｓ以上１２ｍ／ｓ以下がより好ましい。The glass rod processing method according to the present invention uses a glass rod processing burner in which the total cross-sectional area of the oxygen ejection port is 2% or more and 10% or less of the cross-sectional area of the hydrogen ejection port. Gas velocity of 20m / s or more 1
00m / s or less, the gas flow velocity at the hydrogen outlet is 0.5
It is characterized in that it is not less than m / s and not more than 20 m / s. According to the above configuration, the flame is concentrated on the glass rod and the glass rod can be efficiently heated. In addition, the flame does not grow larger than necessary, and there is little adverse effect on peripheral equipment. The gas flow velocity at the nozzle outlet of the hydrogen jet outlet is more preferably 5 m / s or more and 12 m / s or less.
【０００９】[0009]
（実施例1）図３に示すように、直径７０ｍｍ、長さ８
００ｍｍの光ファイバ母材３１をダミーガラス棒３２を
介して横形旋盤のチャック３３に保持し、バーナ台３４
に半円周状に等間隔で９本並べたバーナ３５から、酸水
素火炎を光ファイバ母材３１に吹き付けて火炎研磨を行
った。バーナ３５として、図１（ａ）に示す円柱状の水
素噴出口１中に３個の酸素噴出口２が配置されたバーナ
（水素噴出口の内径１０ｍｍ、酸素噴出口の内径０．８
ｍｍ、酸素噴出口の外径２．０ｍｍ、酸素噴出口の断面
積と水素噴出口の断面積の比２．２％；表１のバーナ
Ａ）を用いた。一本のバーナあたり、水素ガスの流量は
５×１０-4ｍ3／ｓ（約３０リットル／分）、酸素の流
量は２×１０-4ｍ3／ｓ（約１２リットル／分）とし
た。この時の母材表面温度と火炎研磨による外径変化量
（ガラス蒸発量）は、それぞれ表２に示すように、１６
００℃、０．６ｍｍであり、火炎研磨後のガラス母材の
表面状態は良好であった。(Example 1) As shown in FIG. 3, diameter 70 mm, length 8
A 00 mm optical fiber preform 31 is held on a chuck 33 of a horizontal lathe via a dummy glass rod 32, and a burner stand 34
The oxyhydrogen flame was blown onto the optical fiber preform 31 from nine burners 35 arranged in a semicircular shape at regular intervals to perform flame polishing. As the burner 35, a burner in which three oxygen outlets 2 are arranged in a cylindrical hydrogen outlet 1 shown in FIG. 1A (inner diameter of hydrogen outlet is 10 mm, inner diameter of oxygen outlet is 0.8 mm).
mm, the outer diameter of the oxygen ejection port was 2.0 mm, the ratio of the cross-sectional area of the oxygen ejection port to the cross-sectional area of the hydrogen ejection port was 2.2%, and the burner A) in Table 1 was used. The flow rate of hydrogen gas was 5 × 10 -4 m 3 / s (about 30 liters / minute) and the flow rate of oxygen was 2 × 10 -4 m 3 / s (about 12 liters / minute) per burner. . At this time, the base material surface temperature and the outer diameter change amount (glass evaporation amount) due to the flame polishing are 16
The temperature was 00 ° C. and 0.6 mm, and the surface condition of the glass base material after flame polishing was good.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【表２】 [Table 2]
【００１２】（実施例２）実施例１で使用したバーナＡ
に代え、表１のバーナＢ（酸素噴出口の断面積と水素噴
出口の断面積の比３．７％），Ｃ（酸素噴出口の断面積
と水素噴出口の断面積の比５．９％），Ｄ（酸素噴出口
の断面積と水素噴出口の断面積の比９．３％）を使用し
て光ファイバ母材の火炎研磨を行った。その他の構成
は、実施例１と同じとした。この時の母材表面温度と火
炎研磨による外径変化量（ガラス蒸発量）は、それぞれ
表２に示すように、１５００−１７００℃、０．４−
０．８ｍｍであり、火炎研磨後のガラス母材の表面状態
は良好であった。(Example 2) Burner A used in Example 1
Instead of the above, the burner B in Table 1 (a ratio of the cross-sectional area of the oxygen ejection port and the cross-sectional area of the hydrogen ejection port of 3.7%), C (the ratio of the cross-sectional area of the oxygen ejection port and the cross-sectional area of the hydrogen ejection port is 5.9). %), D (a ratio of the cross-sectional area of the oxygen jet port and the cross-sectional area of the hydrogen jet port of 9.3%) was used to perform flame polishing of the optical fiber preform. Other configurations are the same as those in the first embodiment. At this time, the base material surface temperature and the outer diameter change amount (glass evaporation amount) due to flame polishing are 1500-1700 ° C. and 0.4-
It was 0.8 mm, and the surface state of the glass preform after flame polishing was good.
【００１３】（実施例３）実施例１で使用したバーナＡ
に代え、図１（ｂ）に示す円柱状の水素噴出口１中に７
個の酸素噴出口２が配置されたバーナ（水素噴出口の内
径１２ｍｍ、酸素噴出口の内径０．８ｍｍ、酸素噴出口
の外径２．０ｍｍ、酸素噴出口の断面積と水素噴出口の
断面積の比３．９％；表１のバーナＥ）を使用して光フ
ァイバ母材の火炎研磨を行った。その他の構成は、実施
例１と同じとした。この時の母材表面温度と火炎研磨に
よる外径変化量（ガラス蒸発量）は、表２に示すよう
に、１６００℃、０．６ｍｍであり、火炎研磨後のガラ
ス母材の表面状態は良好であった。(Example 3) Burner A used in Example 1
Instead of 7 in the cylindrical hydrogen ejection port 1 shown in FIG.
A burner in which the individual oxygen jets 2 are arranged (inner diameter of hydrogen jet 12 mm, inner diameter of oxygen jet 0.8 mm, outer diameter of oxygen jet 2.0 mm, cross-sectional area of oxygen jet and disconnection of hydrogen jet). The area ratio of 3.9%; the burner E) of Table 1 was used to flame polish the optical fiber preform. Other configurations are the same as those in the first embodiment. At this time, the base material surface temperature and the amount of change in outer diameter (glass evaporation amount) due to flame polishing were 1600 ° C. and 0.6 mm, as shown in Table 2, and the surface state of the glass base material after flame polishing was good. Met.
【００１４】（実施例４）実施例３で使用したバーナＥ
に代え、表１のバーナＦ（酸素噴出口の断面積と水素噴
出口の断面積の比７．０％）を使用して光ファイバ母材
の火炎研磨を行った。その他の構成は、実施例１と同じ
とした。この時の母材表面温度と火炎研磨による外径変
化量（ガラス蒸発量）は、表２に示すように、１４００
℃、０．２ｍｍであり、火炎研磨後のガラス母材の表面
状態は良好であった。(Example 4) Burner E used in Example 3
Instead, the burner F in Table 1 (a ratio of the cross-sectional area of the oxygen jet port and the cross-sectional area of the hydrogen jet port of 7.0%) was used to perform flame polishing of the optical fiber preform. Other configurations are the same as those in the first embodiment. At this time, the base material surface temperature and the outer diameter change amount (glass evaporation amount) due to flame polishing are 1400 as shown in Table 2.
C., 0.2 mm, and the surface condition of the glass preform after flame polishing was good.
【００１５】（実施例５）実施例１で使用したバーナＡ
に代え、図１（ｃ）のバーナ（水素噴出口の内寸８ｍｍ
×１２ｍｍ、酸素噴出口の内径１ｍｍ、酸素噴出口の外
径２．５ｍｍ、酸素噴出口の断面積と水素噴出口の断面
積の比７．０％；表1のバーナＩ）を使用して光ファイ
バ母材の火炎研磨を行った。この時の母材表面温度と火
炎研磨による外径変化量（ガラス蒸発量）は、表２に示
すように、１４００℃、０．２ｍｍであり、火炎研磨後
のガラス母材の表面状態は良好であった。(Example 5) Burner A used in Example 1
Instead of the burner shown in FIG.
X12 mm, oxygen jet inner diameter 1 mm, oxygen jet outer diameter 2.5 mm, ratio of oxygen jet cross-sectional area to hydrogen jet cross-sectional area 7.0%; using burner I in Table 1) The optical fiber preform was flame-polished. At this time, the base material surface temperature and the amount of change in outer diameter (glass evaporation amount) due to flame polishing are 1400 ° C. and 0.2 mm, as shown in Table 2, and the surface condition of the glass base material after flame polishing is good. Met.
【００１６】（比較例１）実施例３で使用したバーナＥ
に代え、表１のバーナＧ（酸素噴出口の断面積と水素噴
出口の断面積の比１２％），Ｈ（酸素噴出口の断面積と
水素噴出口の断面積の比２３％）を使用して光ファイバ
母材の火炎研磨を行った。その他の構成は、実施例１と
同じとした。この時の母材表面温度と火炎研磨による外
径変化量（ガラス蒸発量）は、それぞれ表２に示すよう
に、１３００−１３５０℃、０．０５−０．１５ｍｍで
あり、火炎研磨後のガラス母材の表面にはクラックが生
じた。これは、母材中心まで高温に加熱できなかったた
め、冷却時に表面が急冷し生じたものである。(Comparative Example 1) Burner E used in Example 3
In place of the above, the burner G in Table 1 (a ratio of the cross-sectional area of the oxygen ejection port and the cross-sectional area of the hydrogen ejection port is 12%) and H (the ratio of the cross-sectional area of the oxygen ejection port and the cross-sectional area of the hydrogen ejection port is 23%) are used. Then, the optical fiber preform was flame-polished. Other configurations are the same as those in the first embodiment. At this time, the base material surface temperature and the outer diameter change amount (glass evaporation amount) due to flame polishing were 1300 to 1350 ° C. and 0.05 to 0.15 mm, respectively, as shown in Table 2, and the glass after flame polishing was used. A crack was generated on the surface of the base material. This is because the surface of the base material could not be heated to a high temperature, and the surface was rapidly cooled during cooling.
【００１７】実施例１乃至５、及び、比較例１により断
面積比が２%以上１０%以下のバーナで効率よく火炎研磨
を行うことができ、火炎研磨後の表面状態が良好となる
ことがわかった。According to Examples 1 to 5 and Comparative Example 1, it is possible to efficiently perform flame polishing with a burner having a cross-sectional area ratio of 2% or more and 10% or less, and the surface condition after flame polishing becomes good. all right.
【００１８】（実施例６）表１のバーナＡ，Ｃ，Ｅ，Ｆ
を使用し、実施例1と同一形状の光ファイバ母材の火炎
研磨を行った。バーナの配置は実施例1と同一で、水素
ガスの流量は一本のバーナあたり５×１０-4ｍ3／ｓ
（約３０リットル／分）に固定した。酸素の流量を変化
させて、母材表面温度、外径変化量、表面状態を調べた
結果を表３に示す。(Embodiment 6) Burners A, C, E and F in Table 1
Using, the optical fiber preform having the same shape as in Example 1 was flame-polished. The burner arrangement was the same as in Example 1, and the flow rate of hydrogen gas was 5 × 10 −4 m 3 / s per burner.
It was fixed at (about 30 liters / minute). Table 3 shows the results of examining the base material surface temperature, the outer diameter change amount, and the surface state by changing the flow rate of oxygen.
【００１９】[0019]
【表３】 [Table 3]
【００２０】酸素噴出口におけるガス流速が１８ｍ／ｓ
の場合、火炎研磨後の表面の一部に、クラックが発生し
た。また、酸素噴出口におけるガス流速が１３０ｍ／ｓ
の場合、酸素噴出口におけるガス流速が６５ｍ／ｓの場
合と比べて母材温度、外径変化量に大差は無く酸素ガス
流量を増やした効果は認められなかった。以上の結果よ
り、酸素噴出口におけるガス流量の好適値は、２０ｍ／
ｓ以上１００ｍ／ｓ以下であることがわかった。The gas flow velocity at the oxygen outlet is 18 m / s.
In the case of, cracks were generated on a part of the surface after flame polishing. Also, the gas flow velocity at the oxygen outlet is 130 m / s.
In the case of No. 2, compared with the case where the gas flow velocity at the oxygen jet port was 65 m / s, there was no great difference in the base material temperature and the outer diameter change amount, and the effect of increasing the oxygen gas flow rate was not recognized. From the above results, the preferable value of the gas flow rate at the oxygen ejection port is 20 m /
It was found to be s or more and 100 m / s or less.
【００２１】（実施例７）表１のバーナＦを使用し、実
施例1と同一形状の光ファイバ母材の火炎研磨を行っ
た。バーナの配置は実施例1と同一で、酸素の流量は一
本のバーナあたり３×１０-4ｍ3／ｓ（約１８リットル
／分）に固定した。水素の流量を変化させて、母材表面
温度、外径変化量、表面状態を調べた結果を表４に示
す。(Example 7) Using the burner F shown in Table 1, the optical fiber preform having the same shape as in Example 1 was flame-polished. The burner arrangement was the same as in Example 1, and the flow rate of oxygen was fixed at 3 × 10 −4 m 3 / s (about 18 liter / min) per burner. Table 4 shows the results of examining the base material surface temperature, the outer diameter change amount, and the surface state by changing the flow rate of hydrogen.
【００２２】[0022]
【表４】 [Table 4]
【００２３】水素噴出口におけるガス流速が０．３８ｍ
／ｓの場合、火炎研磨後の表面に折り返し点の近くに、
クラックが発生した。また、水素噴出口におけるガス流
速が大きくなるにしたがって母材表面温度は高くなり、
ガラスロッドは強く加熱されているが、水素流量の増加
とともに経費が急速に増大するので、２０ｍ／ｓを超え
る流速は実用的ではない。以上の結果より、水素噴出口
におけるガス流量の好適値は、０．５ｍ／ｓ以上２０ｍ
／ｓ以下であることがわかった。The gas flow velocity at the hydrogen outlet is 0.38 m.
/ S, near the turning point on the surface after flame polishing,
A crack has occurred. Also, as the gas flow velocity at the hydrogen jet increases, the base metal surface temperature rises,
Although the glass rod is heated strongly, the cost increases rapidly as the hydrogen flow rate increases, so flow velocities above 20 m / s are not practical. From the above results, the preferable value of the gas flow rate at the hydrogen ejection port is 0.5 m / s or more and 20 m or more.
It was found to be below / s.
【００２４】（実施例８）表１のバーナＣとバーナ先端
の断面形状が同じであり、酸素噴出口がバーナ中心軸上
の一点を指向した焦点型構造のバーナを用いて火炎研磨
を行った。光ファイバ母材の形状、バーナの配置、酸
素、水素の流量は実施例１と同じである。この時の母材
表面温度は１６５０℃で、実施例１のバーナＣでの母材
表面温度より５０Ｋ高かった。焦点型構造とすれば、酸
素噴出口がストレートに配置されるバーナよりもガラス
ロッドを効率的に加熱できることを確認した。(Embodiment 8) The burner C shown in Table 1 and the burner tip have the same cross-sectional shape, and flame polishing was carried out using a burner having a focal structure in which the oxygen ejection port was directed to a point on the central axis of the burner. . The shape of the optical fiber preform, the arrangement of burners, and the flow rates of oxygen and hydrogen are the same as those in the first embodiment. At this time, the base material surface temperature was 1650 ° C., which was 50 K higher than the base material surface temperature of the burner C of Example 1. It was confirmed that the glass rod can be heated more efficiently than with the burner in which the oxygen ejection port is arranged straight if the focus structure is used.
【００２５】[0025]
【発明の効果】以上説明したように、本願の構成によれ
ば、酸素流量を大幅に増やさずにガラスロッドを効率よ
く加熱できる。As described above, according to the configuration of the present application, the glass rod can be efficiently heated without significantly increasing the oxygen flow rate.
【図1】本発明にかかるガラスロッド加工用バーナを示
す模式図である。FIG. 1 is a schematic view showing a burner for processing a glass rod according to the present invention.
【図２】従来のガラスロッド加工用バーナを示す模式図
である。FIG. 2 is a schematic view showing a conventional burner for processing a glass rod.
【図3】ガラス母材の火炎研磨の一例を示した概略説明
図である。FIG. 3 is a schematic explanatory view showing an example of flame polishing of a glass base material.
１：水素噴出口 ２：酸素噴出口 ３１：光ファイバ母材 ３２：ダミーガラス棒 ３３：チャック ３４：バーナ台 ３５：バーナ 1: Hydrogen spout 2: Oxygen outlet 31: Optical fiber base material 32: Dummy glass rod 33: Chuck 34: Burner stand 35: Burner
Claims (3)
酸素噴出口が配置され、前記酸素噴出口の断面積の総和
が前記水素噴出口の断面積の２％以上１０％以下である
ことを特徴とするガラスロッド加工用バーナ。1. One or a plurality of oxygen jets are arranged in the hydrogen jet, and the total cross-sectional area of the oxygen jet is 2% or more and 10% or less of the cross-sectional area of the hydrogen jet. A burner for processing glass rods.
点を指向していることを特徴とする請求項１に記載のガ
ラスロッド加工用バーナ。2. The oxygen outlet is 1 on the central axis of the burner.
The glass rod processing burner according to claim 1, wherein the burner is directed to a point.
ーナを用い、前記酸素噴出口におけるガス流速を２０ｍ
／ｓ以上１００ｍ／ｓ以下、前記水素噴出口におけるガ
ス流速を０．５ｍ／ｓ以上２０ｍ／ｓ以下とすることを
特徴とするガラスロッドの加工方法。3. The burner for processing a glass rod according to claim 1, wherein the gas flow velocity at the oxygen jet port is 20 m.
/ S or more and 100 m / s or less, and the gas flow velocity at the hydrogen jet port is 0.5 m / s or more and 20 m / s or less, a method of processing a glass rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26835097A JP3465554B2 (en) | 1997-10-01 | 1997-10-01 | Glass rod processing burner and glass rod processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26835097A JP3465554B2 (en) | 1997-10-01 | 1997-10-01 | Glass rod processing burner and glass rod processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11106230A JPH11106230A (en) | 1999-04-20 |
| JP3465554B2 true JP3465554B2 (en) | 2003-11-10 |
Family
ID=17457322
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26835097A Expired - Lifetime JP3465554B2 (en) | 1997-10-01 | 1997-10-01 | Glass rod processing burner and glass rod processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3465554B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4628613B2 (en) * | 2001-09-11 | 2011-02-09 | 株式会社フジクラ | Flame polishing method for optical fiber preform |
| JP4498802B2 (en) * | 2004-04-01 | 2010-07-07 | 株式会社フジクラ | Glass rod flame polishing method, optical fiber manufacturing method |
-
1997
- 1997-10-01 JP JP26835097A patent/JP3465554B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11106230A (en) | 1999-04-20 |
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