CN103342463B - Optical fiber drawing furnace - Google Patents
Optical fiber drawing furnace Download PDFInfo
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- CN103342463B CN103342463B CN201310281191.9A CN201310281191A CN103342463B CN 103342463 B CN103342463 B CN 103342463B CN 201310281191 A CN201310281191 A CN 201310281191A CN 103342463 B CN103342463 B CN 103342463B
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- ring
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- extension tube
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Abstract
The invention relates to an optical fiber drawing furnace comprising a furnace body, a heating element, a heat preservation element, a middle casing pipe, a flow guide pipe, an extension pipe and a furnace top gaseous disc. The optical fiber drawing furnace is characterized by further comprising a lantern ring, an elastic graphite ring and a gas guide disc. The gas guide disc is mounted on the furnace top gaseous disc. The elastic graphite ring is mounted on a hollow ring plate. The lantern ring is arranged between the flow guide pipe and the extension pipe. A plurality of first air inlet holes can be formed in the side wall of the extension tube at the upper end of the lantern ring. The optical fiber drawing furnace has the advantages of being applicable to drawing prefabricated bars in large diameter and optical fiber prefabricated bars with large diameter fluctuation, meanwhile ensuring that graphite dust has less possibility of being adhered to the prefabricated bars, and effectively controlling the air flow state in the drawing furnace.
Description
Technical field
The present invention relates to a kind of equipment for fiber manufacturing, particularly relate to a kind of fibre drawing furnace being applicable to draw the larger prefabricated rods of diameter and the larger preform of diameter fluctuation.
Background technology
Current fibre drawing furnace comprises body of heater, heating element, thermal insulator, middle sleeve, thrust-augmenting nozzle, extension tube and top gas dish, the upper and lower wall correspondence of body of heater respectively has wire drawing hole and lower wire drawing hole on one, middle sleeve is arranged in body of heater through upper wire drawing hole and lower wire drawing hole, thermal insulator is arranged in body of heater, heating element to be arranged between middle sleeve and thermal insulator in body of heater, upper wire drawing hole arranges top gas dish, extension tube one end is communicated with on the body of heater outside lower wire drawing hole, and thrust-augmenting nozzle one end is sleeved in middle sleeve, and the thrust-augmenting nozzle the other end is sleeved in extension tube, the outer side wall of top gas dish is provided with transfer port, inner side-wall evenly has the gas orifice that several face toward the top gas dish center of circle, when drawing optical fiber, the quartz glass bar end of preform (hereinafter referred to as prefabricated rods) is constantly moved down and enters inside heating furnace, because fiber drawing furnace internal temperature reaches 2200 degrees Celsius, so high purity graphite is commonly used to the material of the heating element as fiber drawing furnace, small―gap suture is had between prefabricated rods in upper wire drawing hole and insertion stove, after entering fiber drawing furnace to prevent extraneous air, graphite is at high temperature oxidized, affect the work-ing life of heating element, graphite dust after simultaneous oxidation can stick to prefabricated rods thawing part, cause the decline of the fiber strength made, need to pass into rare gas element in fiber drawing furnace, as argon gas, helium etc., it is blown in stove by the gas orifice of top gas dish, keep the inert gas atmosphere of certain malleation in stove, on the other hand, drawing optical fibers requires that the air-flow of fiber drawing furnace keeps stable laminar flow regime, in drawing process, the change of air-flow can cause the diameter change of optical fiber and fiber strength to decline, it is less that this requires that preform diameter changes, and general by special extension device, the prefabricated rods changed by diameter greatly at high temperature extends evenly, but along with preform diameter increasing, the fluctuation range of preform diameter just becomes large, the gap fluctuations scope making wire drawing hole and insert between the prefabricated rods in stove, with regard to becoming large, is just difficult to the laminar flow stability of the high-temperature gas controlled in fiber drawing furnace thus.
For this reason, US Patent No. 2006/280578A1 discloses and a kind ofly can respond the method for prefabricated rods external diameter variation for sealing prefabricated rods and wire drawing fire door gap.The method use the wear ring comprising outer shroud and inner ring and be combined into, by spring, sealing ring is shifted onto the surface of prefabricated rods.Japanese Unexamined Patent Publication 2007-70189 publication discloses a kind of containment member, and sealing component has the structure of brush and sac like in fiber drawing furnace mouthpiece.Also has the direct design being sealed prefabricated rods and wire drawing fire door by graphite soft felt; Patent of invention 200810134932.x discloses a kind of structure of graphite flake sealing of two sealing units, this structure is sealed by the elasticity of the graphite flake of particular design, but, in these designs, because fiber drawing furnace adopts downward air-flow trend, the sealing material that fire door uses, under the effect of high temperature and friction, causes some graphite soft felt carbon dusts to enter fiber drawing furnace, thus can cause the strength degradation of optical fiber; In the structure of two unit graphite flake sealings in patent of invention 200810134932.x, the elasticity of graphite flake is at high temperature very little, for the prefabricated rods of larger diameter change, can cause gas leakage, cause the oxidation of fiber drawing furnace.
Summary of the invention
For above shortcoming, the object of the present invention is to provide a kind of fibre drawing furnace, it can be applicable to draw the larger prefabricated rods of diameter and the larger preform of diameter fluctuation, graphite dust can be made not easily to stick in prefabricated rods and the air-flow condition that can effectively control in fiber drawing furnace simultaneously.
Technology contents of the present invention is, a kind of fibre drawing furnace comprises body of heater, heating element, thermal insulator, middle sleeve, thrust-augmenting nozzle, extension tube and top gas dish; It is characterized in that it also comprises spacer ring, elastic graphite ring plate and air-guide disk; Air-guide disk comprises a cavity ring dish and some ring plates, cavity ring Pan Neihuanchu is an open ports, the upper and lower interleaved adjacent of the upper inwall of some ring plates in cavity ring dish, lower inwall is installed, and is provided with the some production wells of a circle at the upper inwall of cavity ring dish near outer side wall place; Air-guide disk to be arranged on top gas dish and to make production well vertically upward, and elastic graphite ring plate is arranged on the cavity ring dish inside production well; Spacer ring is arranged between thrust-augmenting nozzle and extension tube, makes thrust-augmenting nozzle outer wall be formed with gap respectively and between extension tube inwall and middle sleeve inwall; The extension tube sidewall of spacer ring upper end is provided with some first air inlet ports.
For protecting elastic graphite ring plate further, the present invention also comprises sealing gland cover; The sealing gland enclosure to be contained on the cavity ring dish inside production well and to cover elastic graphite ring plate, and sealing gland cover is provided with some second air inlet ports; Sealing gland cover endoporus is provided with at sealing gland cover center.
The present invention is compared with prior art advantageously: elastic graphite ring plate can make fiber drawing furnace can be applicable to draw the larger prefabricated rods of diameter and the larger preform of diameter fluctuation; By to input protection gas in body of heater and the upwards flowing flowing out from the production well of air-guide disk of the extension tube place of furnace bottom, the shielding gas that the gentle sealing cover of air-guide disk inputs also flows out from the production well of air-guide disk, plays the effect of current stabilization thus; Air-guide disk plays the collecting action of ash content simultaneously; The present invention can be applicable to draw the larger prefabricated rods of diameter and the larger preform of diameter fluctuation thus, graphite dust can be made not easily to stick in prefabricated rods and the air-flow condition that can effectively control in fiber drawing furnace simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of air-guide disk in the present invention.
Fig. 3 be in Fig. 2 A-A to schematic diagram.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, a kind of fibre drawing furnace comprises body of heater 1, heating element 2, thermal insulator 3, middle sleeve 4, thrust-augmenting nozzle 5, extension tube 6 and top gas dish 7; It is characterized in that it also comprises spacer ring 8, elastic graphite ring plate 9, the gentle sealing cover 11 of air-guide disk 10; Air-guide disk 10 comprises a cavity ring dish 10.1 and some ring plates 10.2, cavity ring dish 10.1 inner ring place is an open ports 10.3, the upper and lower interleaved adjacent of the upper inwall 10.4 of some ring plates 10.2 in cavity ring dish, lower inwall 10.5 is installed, and is provided with the some production wells 10.7 of a circle at the upper inwall 10.4 of cavity ring dish 10.1 near outer side wall 10.6 place; Air-guide disk 10 to be arranged on top gas dish 7 and to make production well 10.7 vertically upward, and elastic graphite ring plate 9 is arranged on the cavity ring dish 10.1 inside production well 10.7; Spacer ring 8 is arranged between thrust-augmenting nozzle 5 and extension tube 6, makes thrust-augmenting nozzle 5 outer wall be formed with gap 12 respectively and between extension tube 6 inwall and middle sleeve 4 inwall; Extension tube 6 sidewall of spacer ring 8 upper end is provided with some first air inlet ports 6.1; Sealing gland cover 11 to be sleeved on the cavity ring dish 10.1 inside production well 10.7 and to cover elastic graphite ring plate 9, and sealing gland cover 11 is provided with some second air inlet ports 11.1; Sealing gland cover endoporus 11.2 is provided with at sealing gland cover 11 center.
Principle of work of the present invention is, constantly being moved down by preform 13 end enters in heating furnace body 1, heated by heating element 2 pairs of preforms 13, pass into inert protective gas by the first air inlet port 6.1 simultaneously, this inert protective gas is upwards flowed in body of heater by gap 12, wherein part inert protective gas by thrust-augmenting nozzle 5 by flowing downward the optical fiber 14 protecting drawing in extension tube 6; All the other inert protective gas in body of heater on flowing, flowed out by production well 10.7 after then entering air-guide disk 10, simultaneously the volatile matter particle in inert protective gas blocks and makes it be deposited in cavity ring dish 10.1 by ring plate 10.2; Input inert protective gas to protect elastic graphite ring plate 9 and to prevent from, without there being airflow to enter between elastic graphite ring plate 9 and preform 13, flowing out from production well 10.7 after the inert protective gas that the second air inlet port 11.1 inputs flows into air-guide disk 10 downwards by the second air inlet port 11.1 with this simultaneously; The gas orifice 7.1 of top gas dish 7 is blown into inert protective gas in stove, to make body of heater 1 upper end preform 13 ingress enter in body of heater without air, flows out after the inert protective gas that gas orifice 7.1 inputs upwards flows into air-guide disk 10 from production well 10.7.
Claims (1)
1. a fibre drawing furnace comprises body of heater, heating element, thermal insulator, middle sleeve, thrust-augmenting nozzle, extension tube and top gas dish; It is characterized in that it also comprises spacer ring, elastic graphite ring plate and air-guide disk; Air-guide disk comprises a cavity ring dish and some ring plates, cavity ring Pan Neihuanchu is an open ports, the upper and lower interleaved adjacent of the upper inwall of some ring plates in cavity ring dish, lower inwall is installed, and is provided with the some production wells of a circle at the upper inwall of cavity ring dish near outer side wall place; Air-guide disk to be arranged on top gas dish and to make production well vertically upward, and elastic graphite ring plate is arranged on the cavity ring dish inside production well; Spacer ring is arranged between thrust-augmenting nozzle and extension tube, makes thrust-augmenting nozzle outer wall be formed with gap respectively and between extension tube inwall and middle sleeve inwall; The extension tube sidewall of spacer ring upper end is provided with some first air inlet ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310281191.9A CN103342463B (en) | 2013-07-05 | 2013-07-05 | Optical fiber drawing furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310281191.9A CN103342463B (en) | 2013-07-05 | 2013-07-05 | Optical fiber drawing furnace |
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| Publication Number | Publication Date |
|---|---|
| CN103342463A CN103342463A (en) | 2013-10-09 |
| CN103342463B true CN103342463B (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310281191.9A Active CN103342463B (en) | 2013-07-05 | 2013-07-05 | Optical fiber drawing furnace |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107555780B (en) * | 2017-09-05 | 2023-08-08 | 江苏斯德雷特光纤科技有限公司 | Sealing device under extension furnace |
| CN109608032B (en) * | 2018-12-26 | 2021-11-26 | 南京华信藤仓光通信有限公司 | Rod conveying device of resistance furnace for hanging round-handle rod |
| CN112939449A (en) * | 2021-03-09 | 2021-06-11 | 通鼎互联信息股份有限公司 | Graphite assembly for helium-free optical fiber drawing furnace |
| CN114014534B (en) * | 2021-12-21 | 2023-08-22 | 江苏亨通光纤科技有限公司 | Optical fiber drawing furnace gas sealing method and device adopting three-dimensional graphite felt sealing structure |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4030901A (en) * | 1976-07-19 | 1977-06-21 | Bell Telephone Laboratories, Incorporated | Method for drawing fibers |
| US5637130A (en) * | 1993-07-13 | 1997-06-10 | Sumitomo Electric Industries, Inc. | Method and furnace for drawing optical fibers |
| JPH10279326A (en) * | 1997-04-02 | 1998-10-20 | Yazaki Corp | Drawing and heating furnace for optical fiber |
| CN1206696A (en) * | 1997-07-24 | 1999-02-03 | 阿尔卡塔尔-阿尔斯托姆通用电气公司 | Top gaseous diffuser of the deivce for drawing optical fiber from optical fiber prefabricated bar |
| JP2003267745A (en) * | 2002-03-15 | 2003-09-25 | Fujikura Ltd | Method and apparatus for drawing optical fiber |
| CN1474786A (en) * | 2000-11-17 | 2004-02-11 | ά | Apparatus and process for producing optical fibre preform |
| CN203319858U (en) * | 2013-07-05 | 2013-12-04 | 江苏法尔胜光子有限公司 | Optical fiber drawing furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100545814B1 (en) * | 2002-08-31 | 2006-01-24 | 엘에스전선 주식회사 | Optical Fiber Edge Melting Furnace and Optical Fiber Edge Cutting Method Using The Same |
-
2013
- 2013-07-05 CN CN201310281191.9A patent/CN103342463B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4030901A (en) * | 1976-07-19 | 1977-06-21 | Bell Telephone Laboratories, Incorporated | Method for drawing fibers |
| US5637130A (en) * | 1993-07-13 | 1997-06-10 | Sumitomo Electric Industries, Inc. | Method and furnace for drawing optical fibers |
| JPH10279326A (en) * | 1997-04-02 | 1998-10-20 | Yazaki Corp | Drawing and heating furnace for optical fiber |
| CN1206696A (en) * | 1997-07-24 | 1999-02-03 | 阿尔卡塔尔-阿尔斯托姆通用电气公司 | Top gaseous diffuser of the deivce for drawing optical fiber from optical fiber prefabricated bar |
| CN1474786A (en) * | 2000-11-17 | 2004-02-11 | ά | Apparatus and process for producing optical fibre preform |
| JP2003267745A (en) * | 2002-03-15 | 2003-09-25 | Fujikura Ltd | Method and apparatus for drawing optical fiber |
| CN203319858U (en) * | 2013-07-05 | 2013-12-04 | 江苏法尔胜光子有限公司 | Optical fiber drawing furnace |
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| CN103342463A (en) | 2013-10-09 |
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