JPH0578142A - Optical fiber wire drawing furnace - Google Patents
Optical fiber wire drawing furnaceInfo
- Publication number
- JPH0578142A JPH0578142A JP24337091A JP24337091A JPH0578142A JP H0578142 A JPH0578142 A JP H0578142A JP 24337091 A JP24337091 A JP 24337091A JP 24337091 A JP24337091 A JP 24337091A JP H0578142 A JPH0578142 A JP H0578142A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- heat
- heater
- optical fiber
- insulating material
- 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
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
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/60—Optical fibre draw furnaces
- C03B2205/62—Heating means for drawing
- C03B2205/63—Ohmic resistance heaters, e.g. carbon or graphite resistance heaters
-
- 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
- C03B2205/70—Draw furnace insulation
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光ファイバ母材から光
ファイバを線引きする光ファイバ線引き炉に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber drawing furnace for drawing an optical fiber from an optical fiber preform.
【０００２】[0002]
【従来の技術】従来のこの種の光ファイバ線引き炉は、
図４に示すように、線引きされる光ファイバ母材１が挿
入されるカーボン製等の炉心管２と、該炉心管２の外周
に配置されたカーボン製のヒータ３と、該ヒータ３の外
周に配置されたカーボン多孔質体等よりなる耐熱性断熱
材４と、これらの構成部材２，３，４を収納する炉体５
とを備えている。該耐熱性断熱材４により、炉体５の外
への無駄な熱拡散を防止するようになっている。2. Description of the Related Art A conventional optical fiber drawing furnace of this type is
As shown in FIG. 4, a core tube 2 made of carbon or the like into which the optical fiber preform 1 to be drawn is inserted, a heater 3 made of carbon arranged on the outer periphery of the core tube 2, and an outer periphery of the heater 3. -Resistant heat-insulating material 4 made of a porous carbon material, etc., and a furnace body 5 for accommodating these constituent members 2, 3, 4
It has and. The heat-resistant heat insulating material 4 prevents unnecessary heat diffusion to the outside of the furnace body 5.
【０００３】炉体５の上部には、光ファイバ母材１が挿
入される入り口６を取巻いて不活性ガスを光ファイバ母
材１の外周に吹出し口７から吹き出す不活性ノズル８が
設けられている。不活性ノズル８には、不活性ガス導入
口９が設けられている。吹出し口７から吹き出された不
活性ガスは、一部は炉体５の外部に、残りは光ファイバ
母材１に沿って炉心管２内に流れ、炉心管２内を不活性
ガス雰囲気に保つようになっている。従って、炉心管２
内が線引き温度である高温に保たれてもカーボン等で形
成された炉心管２の酸化消耗を防止できる。At the upper part of the furnace body 5, an inert nozzle 8 is provided which surrounds an inlet 6 into which the optical fiber preform 1 is inserted and blows an inert gas to the outer periphery of the optical fiber preform 1 from an outlet 7. ing. The inert nozzle 8 is provided with an inert gas inlet 9. Part of the inert gas blown out from the outlet 7 flows to the outside of the furnace body 5 and the rest flows along the optical fiber preform 1 into the furnace core tube 2 to keep the furnace core tube 2 in an inert gas atmosphere. It is like this. Therefore, the core tube 2
Even if the inside is kept at a high temperature which is the drawing temperature, it is possible to prevent the oxidative consumption of the core tube 2 made of carbon or the like.
【０００４】更に、炉体５にも不活性ガス導入口１０が
設けられ、これによって不活性ガスが炉心管２と炉体５
との間の空間１１に導入され、ヒータ３と耐熱性断熱材
４との酸化消耗を防止するようになっている。Further, the furnace body 5 is also provided with an inert gas inlet port 10, whereby the inert gas is transferred to the furnace core tube 2 and the furnace body 5.
It is introduced into a space 11 between the heater 3 and the heat resistant heat insulating material 4 so as to prevent the heater 3 and the heat resistant heat insulating material 4 from being consumed by oxidation.
【０００５】このような光ファイバ線引き炉において
は、炉心管２内で光ファイバ母材１の下部が加熱溶融さ
れ、その加熱溶融部分から光ファイバ１２が線引きされ
る。In such an optical fiber drawing furnace, the lower portion of the optical fiber preform 1 is heated and melted in the core tube 2, and the optical fiber 12 is drawn from the heated and melted portion.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、従来の
このような光ファイバ線引き炉では、炉体５の外への無
駄な熱拡散を防止するために設けられている耐熱性断熱
材４がカーボン多孔質体等よりなる熱良導体であるの
で、多孔質構造にしても熱絶縁性が劣ることは避けられ
ない問題点がある。線引き炉内の線引き温度は2200℃程
度の高温になるため、耐熱性断熱材４の熱絶縁性が悪い
と、エネルギーロスが多く、省エネルギーを図れず、ま
たや耐熱性断熱材４の厚みを増やす等しないといけない
ので、炉の大型化をまねく等の問題点があった。However, in such a conventional optical fiber drawing furnace, the heat-resistant heat insulating material 4 provided to prevent wasteful heat diffusion to the outside of the furnace body 5 is made of carbon porous material. Since it is a good conductor of heat composed of a substance or the like, there is an unavoidable problem that the heat insulation is inferior even if it has a porous structure. Since the wire drawing temperature in the wire drawing furnace is as high as about 2200 ° C, if the heat insulating property of the heat resistant heat insulating material 4 is poor, energy loss is large and energy saving cannot be achieved, and the thickness of the heat resistant heat insulating material 4 is increased Since there is a need to do so, there was a problem such as causing the furnace to become larger.
【０００７】本発明の目的は、炉体の外への熱逸散を防
止できる光ファイバ線引き炉を提供することにある。An object of the present invention is to provide an optical fiber drawing furnace which can prevent heat dissipation to the outside of the furnace body.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成する本
発明の構成を説明すると、本発明は線引きされる光ファ
イバ母材が挿入される炉心管と、前記炉心管の外周に配
置されたヒータと、前記ヒータの外周に配置された耐熱
性断熱材と、これらの構成部材を収納する炉体とを有す
る光ファイバ線引き炉において、前記ヒータと前記耐熱
性断熱材との間に反射板が配置されていることを特徴と
する。The structure of the present invention for achieving the above object will be described. The present invention has a core tube into which an optical fiber preform to be drawn is inserted, and the core tube is arranged on the outer periphery of the core tube. In a fiber optic drawing furnace having a heater, a heat-resistant heat insulating material arranged on the outer periphery of the heater, and a furnace body housing these constituent members, a reflection plate is provided between the heater and the heat resistant heat insulating material. It is characterized by being arranged.
【０００９】[0009]
【作用】このようにヒータと耐熱性断熱材との間に反射
板を配置すると、該反射板が熱線を反射するので、耐熱
性断熱材を介して炉体の外へ排出される熱量を減少させ
ることができる。When the reflector is arranged between the heater and the heat-resistant heat insulating material as described above, the heat radiation is reflected by the reflector and the amount of heat discharged to the outside of the furnace body through the heat-resistant heat insulating material is reduced. Can be made
【００１０】[0010]
【実施例】図１及び図２は、本発明に係る光ファイバ線
引き炉の一実施例を示したものである。なお、前述した
図４と対応する部分には、同一符号を付けて示してい
る。本実施例の光ファイバ線引き炉においては、ヒータ
３と耐熱性断熱材４との間に反射板１３が配置されてい
る。ヒータ３は、導体１４，１５を経て通電されるよう
になっている。1 and 2 show an embodiment of an optical fiber drawing furnace according to the present invention. The parts corresponding to those in FIG. 4 described above are designated by the same reference numerals. In the optical fiber drawing furnace of this embodiment, the reflection plate 13 is arranged between the heater 3 and the heat resistant heat insulating material 4. The heater 3 is adapted to be energized via the conductors 14 and 15.
【００１１】なお、反射板１３は、一重でもよいし、或
いは反射効力を上げるべく多重でもよい。また、その材
質はタングステン又はモリブデン等のような耐熱性に優
れたものが使用される。The reflection plate 13 may be a single layer or multiple layers to enhance the reflection efficiency. As the material, a material having excellent heat resistance such as tungsten or molybdenum is used.
【００１２】このようにヒータ３と耐熱性断熱材４との
間に反射板１３を配置すると、該反射板１３が熱線を反
射するので、従来と同じ耐熱性断熱材４を用いても、そ
の厚みを減少させることができる。このため炉体５を小
型化することができる。また、炉体５の外への熱逸散を
防止できるので、省エネルギーを図ることができる。更
に、炉体５へ与える熱量が減少するので、設備の信頼性
を向上させることができる。When the reflection plate 13 is arranged between the heater 3 and the heat-resistant heat insulating material 4 as described above, since the reflection plate 13 reflects heat rays, even if the same heat-resistant heat insulating material 4 as the conventional one is used, The thickness can be reduced. Therefore, the furnace body 5 can be downsized. Further, heat can be prevented from being dissipated to the outside of the furnace body 5, so that energy can be saved. Furthermore, since the amount of heat applied to the furnace body 5 is reduced, the reliability of the equipment can be improved.
【００１３】本発明の光ファイバ線引き炉（本発明炉）
と従来の光ファイバ線引き炉（従来炉）との比較を行っ
たところ、図３に示すような結果が得られた。なお、ヒ
ータ３の表面温度は1700℃になるようにした。そのとき
の消費電力と温度分布を表１に示す。Optical fiber drawing furnace of the present invention (furnace of the present invention)
When compared with a conventional optical fiber drawing furnace (conventional furnace), the results shown in FIG. 3 were obtained. The surface temperature of the heater 3 was set to 1700 ° C. Table 1 shows the power consumption and temperature distribution at that time.
【００１４】[0014]
【表１】 [Table 1]
【００１５】このように従来炉では、ヒータ長が長い方
が消費電力が大きい。ヒータ長が短いと、約14パーセン
ト位消費電力が少ない。As described above, in the conventional furnace, the longer the heater length, the larger the power consumption. When the heater length is short, the power consumption is about 14% less.
【００１６】一方、本発明炉では、多少消費電力は大き
くなるが、その大きさは約５％である。On the other hand, in the furnace of the present invention, the power consumption is somewhat increased, but the size is about 5%.
【００１７】これによりヒータ３の温度は、設定温度17
00℃に対し、従来炉は1580℃、本発明炉は1670℃であっ
た。設定値に対する温度差は、従来炉は120 ℃、本発明
炉は30℃であり、本発明炉によれば消費電力が少ないこ
とがわかる。また、本発明炉では、温度分布が従来炉に
比べシャープである。従来炉は、ヒータ長が長いと、最
高温度点はあまり変わらず、温度分布が広くなることが
わかった。最高温度点を本発明炉と同じくするには、更
に沢山の電力を加えなければならず、ヒータ長が最高温
度を得るための有効な手段にはならないこともわかっ
た。従来炉では、本発明炉と同じ最高温度を得るには、
必要とする電力量は1.5 〜1.7 倍かかった。As a result, the temperature of the heater 3 is set to 17
Compared to 00 ° C, the conventional furnace was 1580 ° C, and the furnace of the present invention was 1670 ° C. The temperature difference with respect to the set value was 120 ° C. in the conventional furnace and 30 ° C. in the furnace of the present invention, which shows that the furnace of the present invention consumes less power. In addition, the furnace of the present invention has a sharper temperature distribution than the conventional furnace. It was found that in the conventional furnace, when the heater length was long, the maximum temperature point did not change much and the temperature distribution became wider. It was also found that in order to make the maximum temperature point the same as that of the furnace of the present invention, more electric power had to be applied, and the heater length was not an effective means for obtaining the maximum temperature. In the conventional furnace, to obtain the same maximum temperature as the furnace of the present invention,
The amount of power required was 1.5 to 1.7 times.
【００１８】以上により、本発明によれば、消費電力が
少なく、経済的に優れており、必要以上に高温領域が広
くならず、設備の安定性にも優れていることがわかる。From the above, according to the present invention, it is understood that the power consumption is low, the cost is excellent, the high temperature region is not unnecessarily widened, and the facility is stable.
【００１９】[0019]
【発明の効果】以上説明したように本発明に係る光ファ
イバ線引き炉では、ヒータと耐熱性断熱材との間に反射
板を配置したので、該反射板が熱線を反射することにな
り、耐熱性断熱材を介して炉体の外へ排出される熱量を
減少させることができる。このため、従来と同じ熱量を
得るための消費電力が少なくてすみ、省エネルギー型の
炉を実現することができる。また、本発明によれば、ヒ
ータ長を短くすることができ、炉の小型化を図ることが
できる。更に、本発明によれば、温度分布も従来に比べ
てシャープになるので、炉体に熱負荷がかかり難く、設
備の安全性を向上させることができる。As described above, in the optical fiber drawing furnace according to the present invention, since the reflector is arranged between the heater and the heat-resistant heat insulating material, the reflector reflects the heat rays and the heat The amount of heat discharged to the outside of the furnace body through the heat insulating material can be reduced. For this reason, the power consumption for obtaining the same amount of heat as the conventional one is small, and an energy-saving furnace can be realized. Further, according to the present invention, the heater length can be shortened, and the furnace can be downsized. Furthermore, according to the present invention, the temperature distribution becomes sharper than in the conventional case, so that the furnace body is less likely to be subjected to a heat load, and the safety of the equipment can be improved.
【図１】本発明に係る光ファイバ線引き炉の一実施例を
示す縦断面図である。FIG. 1 is a vertical sectional view showing an embodiment of an optical fiber drawing furnace according to the present invention.
【図２】図１のＡ−Ａ線断面図である。FIG. 2 is a sectional view taken along the line AA of FIG.
【図３】本発明炉と従来炉との温度分布の比較図であ
る。FIG. 3 is a comparison diagram of temperature distributions of a furnace of the present invention and a conventional furnace.
【図４】従来炉の縦断面図である。FIG. 4 is a vertical sectional view of a conventional furnace.
１…光ファイバ母材、２…炉心管、３…ヒータ、４…耐
熱性断熱材、５…炉体、６…入り口、７…吹出し口、８
…不活性ノズル、９，１０…不活性ガス導入口、１１…
空間、１２…光ファイバ、１３…反射板。DESCRIPTION OF SYMBOLS 1 ... Optical fiber preform, 2 ... Reactor tube, 3 ... Heater, 4 ... Heat resistant heat insulating material, 5 ... Furnace body, 6 ... Entrance, 7 ... Outlet, 8
... Inert nozzle, 9, 10 ... Inert gas inlet, 11 ...
Space, 12 ... Optical fiber, 13 ... Reflector.
Claims (1)
る炉心管と、前記炉心管の外周に配置されたヒータと、
前記ヒータの外周に配置された耐熱性断熱材と、これら
の構成部材を収納する炉体とを有する光ファイバ線引き
炉において、前記ヒータと前記耐熱性断熱材との間に反
射板が配置されていることを特徴とする光ファイバ線引
き炉。1. A furnace core tube into which an optical fiber preform to be drawn is inserted, and a heater arranged on the outer periphery of the furnace core tube,
In a fiber optic drawing furnace having a heat resistant heat insulating material arranged on the outer periphery of the heater and a furnace body housing these constituent members, a reflection plate is arranged between the heater and the heat resistant heat insulating material. An optical fiber drawing furnace characterized in that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24337091A JPH0578142A (en) | 1991-09-24 | 1991-09-24 | Optical fiber wire drawing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24337091A JPH0578142A (en) | 1991-09-24 | 1991-09-24 | Optical fiber wire drawing furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0578142A true JPH0578142A (en) | 1993-03-30 |
Family
ID=17102837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24337091A Pending JPH0578142A (en) | 1991-09-24 | 1991-09-24 | Optical fiber wire drawing furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0578142A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100563501B1 (en) * | 2001-08-16 | 2006-03-28 | 가부시키가이샤 고베 세이코쇼 | Optical fiber preform-heating furnace |
| WO2006075461A1 (en) * | 2005-01-14 | 2006-07-20 | Shin-Etsu Chemical Co., Ltd. | Drawing method of optical fiber |
| CN114349329A (en) * | 2021-11-22 | 2022-04-15 | 山东阳谷电缆集团有限公司 | Longitudinal extending device for optical fiber preform |
-
1991
- 1991-09-24 JP JP24337091A patent/JPH0578142A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100563501B1 (en) * | 2001-08-16 | 2006-03-28 | 가부시키가이샤 고베 세이코쇼 | Optical fiber preform-heating furnace |
| WO2006075461A1 (en) * | 2005-01-14 | 2006-07-20 | Shin-Etsu Chemical Co., Ltd. | Drawing method of optical fiber |
| CN114349329A (en) * | 2021-11-22 | 2022-04-15 | 山东阳谷电缆集团有限公司 | Longitudinal extending device for optical fiber preform |
| CN114349329B (en) * | 2021-11-22 | 2023-11-07 | 山东阳谷电缆集团有限公司 | Longitudinal extension device for optical fiber preform |
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