JPS634959Y2 - - Google Patents
Info
- Publication number
- JPS634959Y2 JPS634959Y2 JP1984062353U JP6235384U JPS634959Y2 JP S634959 Y2 JPS634959 Y2 JP S634959Y2 JP 1984062353 U JP1984062353 U JP 1984062353U JP 6235384 U JP6235384 U JP 6235384U JP S634959 Y2 JPS634959 Y2 JP S634959Y2
- Authority
- JP
- Japan
- Prior art keywords
- heating element
- arc
- shaped
- electrode
- electric furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 40
- 125000006850 spacer group Chemical group 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
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
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)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
- Resistance Heating (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は高温を得るための抵抗発熱体電気炉の
特にその電極と発熱体との電気的な接続部に関す
るものである。[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an electric furnace with a resistance heating element for obtaining high temperature, and particularly to an electrical connection between the electrode and the heating element.
（従来技術）
従来、この種の電気炉において、電極と発熱体
との接続部には、発熱体と同種の材料で作られた
ボルトを介して互いを締め付けるもの、または水
冷される金属電極を直接発熱体にねじ込んだも
の、また発熱体自体を電極にねじ込んだものなど
があつた。こけらの電気炉において、特に2000℃
以上の高温を得るためのものにおいては、温度を
上げるにしたがつて主に発熱体と電極との熱膨張
の相違のために互いの締め付けが不完全となつて
接触不良を生じ、加熱温度が不安定となつたり、
電極部での放電や電極部の損傷を生じるなどして
信頼性に乏しいものであつた。また、約100Aも
の大電流を流すにははなはだ不安定であつた。(Prior art) Conventionally, in this type of electric furnace, the connection between the electrode and the heating element is either tightened together with a bolt made of the same material as the heating element, or a water-cooled metal electrode is used. Some were screwed directly into the heating element, and others were screwed into the heating element itself. In the electric furnace of shingles, especially at 2000℃
In devices for obtaining higher temperatures, as the temperature is raised, the heating element and electrode become incompletely tightened together due to the difference in thermal expansion, resulting in poor contact, and the heating temperature increases. Becoming unstable,
The reliability was poor due to discharge in the electrode part and damage to the electrode part. In addition, it was extremely unstable to pass a large current of approximately 100A.
（考案の目的）
本考案は、上記従来の問題を解決するものであ
り、電極と発熱体とを互いに締め付けるように強
固に接続することができて、信頼性の高い抵抗発
熱体電気炉を提供することを目的とする。(Purpose of the invention) The present invention solves the above-mentioned conventional problems, and provides a highly reliable resistance heating element electric furnace in which the electrodes and the heating element can be tightly connected to each other so as to tighten them. The purpose is to
（考案の構成）
本考案の抵抗発熱体電気炉は、円弧状とした電
極に内接するように発熱体側の円弧状発熱体リー
ド部を備え、そしてこの円弧状発熱体リード部の
内周部に、テーパを有するリング状のスペーサを
挿入して、前記円弧状発熱体リード部を前記電極
に押し付けて保持したことを特徴とする。(Structure of the invention) The resistance heating element electric furnace of the invention is provided with an arc-shaped heating element lead part on the heating element side so as to be inscribed in the arc-shaped electrode, and the inner peripheral part of the arc-shaped heating element lead part is , a ring-shaped spacer having a taper is inserted to press and hold the arc-shaped heating element lead portion against the electrode.
（実施例）
以下、本考案の一実施例を図面に基づいて説明
する。(Example) Hereinafter, an example of the present invention will be described based on the drawings.
第１図は、本考案の抵抗発熱体電気炉を石英系
光フアイバ母材の線引き用管状炉に応用したもの
の断面図であり、第２図は第１図の−線に沿
う断面図である。 Fig. 1 is a cross-sectional view of a resistance heating element electric furnace of the present invention applied to a tubular furnace for drawing a silica-based optical fiber base material, and Fig. 2 is a cross-sectional view taken along the - line in Fig. 1. .
この線引き炉は、水冷された炉体１の内部に円
筒状のカーボン製の発熱体４を有し、そしてその
発熱体４の周囲に断熱材７を配置していて、その
炉上部から石英系光フアイバの母材８を導入し
て、フアイバ９に線引きするものである。発熱体
４からはリード部５ａ，５ｂがでており、このリ
ード部５ａ，５ｂは、水冷された金属電極２ａ，
２ｂに対し、外周部にテーパを有する石英ガラス
製の絶縁スペーサ６によつて、内側から押し付け
られて接続されている。すなわち、第２図に示す
ように、電極２ａ，２ｂは判割りの円筒形状で対
をなし、また発熱体リード部５ａ，５ｂもそれぞ
れの電極２ａ，２ｂに対応すべく対をなして同心
円状に配置されている。スペーサ６は単体のリン
グ状であり、リード部５ａ，５ｂと接する外周部
がテーパ状となつている。発熱体４の組み立てに
際しては、発熱体リード部５ａ，５ｂを１対の電
極２ａ，２ｂの所定の位置にセツトし、そしてリ
ード部５ａ，５ｂの内側にリング状のスペーサ６
を差し込むだけで完了する。このように、電極２
ａ，２ｂと発熱体４の接続部は極めて簡便な構造
となつている。 This wire drawing furnace has a cylindrical carbon heating element 4 inside a water-cooled furnace body 1, and a heat insulating material 7 is arranged around the heating element 4. An optical fiber base material 8 is introduced and a fiber 9 is drawn. Lead parts 5a and 5b come out from the heating element 4, and these lead parts 5a and 5b are connected to water-cooled metal electrodes 2a and 5b.
2b is pressed and connected from the inside by an insulating spacer 6 made of quartz glass having a tapered outer circumferential portion. That is, as shown in FIG. 2, the electrodes 2a and 2b have a cylindrical shape and form a pair, and the heating element lead portions 5a and 5b are also formed in a concentric pair to correspond to the respective electrodes 2a and 2b. It is located in The spacer 6 is in the form of a single ring, and has a tapered outer peripheral portion that contacts the lead portions 5a and 5b. When assembling the heating element 4, the heating element lead parts 5a and 5b are set at predetermined positions of the pair of electrodes 2a and 2b, and a ring-shaped spacer 6 is placed inside the lead parts 5a and 5b.
Just plug it in and you're done. In this way, electrode 2
The connection portion between a, 2b and the heating element 4 has an extremely simple structure.
発熱体４に通電すると、その発熱体温度が高く
なるにつれてリード部５ａ，５ｂも温度が高くな
る。一方、電極２ａ，２ｂは、水冷されているた
め温度の上昇が抑制される。また、スペーサ６も
温度上昇にともなつて膨張する。それらの結果、
温度が高くなるにしたがつて、リード部５ａ，５
ｂは電極２ａ，２ｂに対してより強く締め付けら
れることになり、高い温度ほど電極２ａ，２ｂと
リード部５ａ，５ｂの接触力が高まることにな
る。 When the heating element 4 is energized, as the temperature of the heating element increases, the temperature of the lead parts 5a and 5b also increases. On the other hand, since the electrodes 2a and 2b are water-cooled, a rise in temperature is suppressed. Further, the spacer 6 also expands as the temperature rises. As a result,
As the temperature increases, the lead parts 5a, 5
b will be tightened more strongly against the electrodes 2a, 2b, and the higher the temperature, the higher the contact force between the electrodes 2a, 2b and the lead portions 5a, 5b.
ちなみに、本実施例において加熱温度2200℃と
した場合、リード部５ａ，５ｂと電極２ａ，２ｂ
との接触面における電流密度が約170A／cm2まで
は電極２ａ，２ｂの損傷は全く認められず、数日
にわたる連続運転を安定して行うことができた。 By the way, in this example, when the heating temperature is 2200°C, the lead parts 5a, 5b and the electrodes 2a, 2b
No damage was observed to the electrodes 2a and 2b until the current density at the contact surface was about 170 A/cm 2 , and continuous operation over several days could be carried out stably.
（考案の効果）
以上説明したように、この考案の抵抗発熱体電
気炉は、円弧状の電極に、それと対応する円弧状
の発熱体リード部を内接させて、そのリード部の
内側に挿入するスペーサによつて発熱体リード部
を電極に押し付けて保持するものであるから、特
に高温下における電極とスペーサの熱膨張差によ
つて発熱体リード部と電極の接続をより確実なも
のとすることができる。したがつて、簡易な接続
構造で信頼性の高い抵抗発熱体電気炉を提供する
ことができる。As explained above, the resistance heating electric furnace of this invention has an arc-shaped electrode with a corresponding arc-shaped heating element lead inscribed therein, and the heating element lead is pressed against the electrode by a spacer inserted inside the lead, so that the difference in thermal expansion between the electrode and the spacer, especially at high temperatures, can ensure a more reliable connection between the heating element lead and the electrode. Therefore, a highly reliable resistance heating electric furnace can be provided with a simple connection structure.
第１図は本考案の一実施例の断面図、第２図は
第１図の−線に沿う断面図である。
１……炉体、２ａ，２ｂ……電極、４……発熱
体、５ａ，５ｂ……発熱体リード部、６……スペ
ーサ。
FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. DESCRIPTION OF SYMBOLS 1...Furnace body, 2a, 2b...Electrode, 4...Heating element, 5a, 5b...Heating element lead part, 6...Spacer.
Claims (1)
抵抗発熱体電気炉において、炉体の内壁に沿つて
円弧状の電極が設けられ、前記発熱体側の円弧状
発熱体リード部が前記電極に内接して備えられ、
前記円弧状発熱体リード部の内周部に、テーパを
有するリング状のスペーサが挿入れて、前記円弧
状発熱体リード部が前記円弧状の電極に押し付け
られて保持されていることを特徴とする抵抗発熱
体電気炉。 In a resistance heating element electric furnace having a heating element made of a cylindrical heat-resistant conductive material, an arc-shaped electrode is provided along the inner wall of the furnace body, and an arc-shaped heating element lead portion on the side of the heating element is inscribed in the electrode. be prepared,
A tapered ring-shaped spacer is inserted into the inner peripheral portion of the arc-shaped heating element lead portion, and the arc-shaped heating element lead portion is pressed against and held by the arc-shaped electrode. Resistance heating element electric furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6235384U JPS60176097U (en) | 1984-04-27 | 1984-04-27 | Resistance heating element electric furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6235384U JPS60176097U (en) | 1984-04-27 | 1984-04-27 | Resistance heating element electric furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60176097U JPS60176097U (en) | 1985-11-21 |
| JPS634959Y2 true JPS634959Y2 (en) | 1988-02-09 |
Family
ID=30591491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6235384U Granted JPS60176097U (en) | 1984-04-27 | 1984-04-27 | Resistance heating element electric furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60176097U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3986611B2 (en) * | 1997-05-01 | 2007-10-03 | 株式会社フジクラ | Heating furnace for optical fiber preform manufacturing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US982420A (en) * | 1908-07-20 | 1911-01-24 | Nat Carbon Co | Electric furnace. |
| US3160693A (en) * | 1962-04-26 | 1964-12-08 | Titanium Metals Corp | Furnace for determining melting points of metals |
-
1984
- 1984-04-27 JP JP6235384U patent/JPS60176097U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US982420A (en) * | 1908-07-20 | 1911-01-24 | Nat Carbon Co | Electric furnace. |
| US3160693A (en) * | 1962-04-26 | 1964-12-08 | Titanium Metals Corp | Furnace for determining melting points of metals |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60176097U (en) | 1985-11-21 |
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