CN103771697A - Sintering method and apparatus for large-size optical fiber preform loose body - Google Patents
Sintering method and apparatus for large-size optical fiber preform loose body Download PDFInfo
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- CN103771697A CN103771697A CN201210405574.8A CN201210405574A CN103771697A CN 103771697 A CN103771697 A CN 103771697A CN 201210405574 A CN201210405574 A CN 201210405574A CN 103771697 A CN103771697 A CN 103771697A
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- heater
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- loose media
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- 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
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- 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
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Abstract
The invention discloses a sintering method for a large-size optical fiber preform loose body. According to the invention, furnace construction of a sintering furnace is improved, the manner of combined heating by a clean quartz furnace core tube and an graphite assembly consisting of a graphite heater and a graphite insulation member sleeved at the outer side of the clean quartz furnace core tube is used to replace the conventional manner of combined heating by the clean quartz furnace core tube and a molybdenum disilicide heating member sleeved at the outer side of the clean quartz furnace core tube, the graphite assembly can well compensate for insufficiencies of a molybdenum disilicide material due to its characteristics; an N2 protection system and a furnace body cooling water system are auxilarily arranged to prevent oxidation of the graphite assembly at high temperature and deformation of the furnace body at high temperature, so effective operation of the whole heating system is guaranteed, and the sintering method for the large-size optical fiber preform loose body is realized. Through improvement of the heating manner and a differential pressure control manner, the sintering method provided by the invention successfully sinters the optical fiber preform loose body with a diameter Phi of greater than 250 mm and exerts no adverse influence on product quality and on optical parameters of an optical fiber preform while reducing production cost and improving production efficiency.
Description
Technical field
The invention belongs to optical communication technique, be applied to the manufacture of preform, be specifically related to make in the process of preform of vitrifying sintering process a kind of sintering method of large-scale optical fiber prefabricating stick loose media and device.
Background technology
Manufacture at present the surrounding layer technique of preform, what be most widely used is vapour phase axial deposition technique (VAD) and outer vapour deposition process (OVD), these two kinds of methods all belong to the outer method of pipe, are applicable to manufacturing large-sized preform, have the advantage that production efficiency is high, cost is low.In the process of the preform of gas phase process manufacture outside surrounding layer, also there are deposition and two basic steps of sintering, by optical design requirement, plug is extended to after accurate internal diameter, carry out again loose porous loose media deposition on its surface, again the preform loose media having deposited is carried out to sintering processes, remove residual moisture, manufacture the preform of transparent anhydrous point.
And the sintering process of preform loose media, mainly that preform loose media after outer vapour deposition for example, through (passing into siccative from the temperature range of 1100 ℃ to 1700 ℃, chlorine) making a return journey dewaters and metallic impurity, sinters the glass preform of transparent anhydrous point into.The process of sintering namely preform loose media specific surface area reduces, the densification process that porosity reduces, mechanical property improves.Loose media preform sintering dehydration reaction formula is as follows:
2H
2O（g）+2Cl
2（g）=4HCl（g）+O
2（g）
In preform field, along with the development of Optical Fiber Market, competition.For strengthening the profitability of company, reduce unstripped gas unit consumption amount, reduce prefabricated rods manufacturing cost, be trend of the times.Prefabricated fiber rod depositing length lengthens, internal diameter increases the trend that has slightly become prefabricated rods development, and the equipment and process of Development and Production large-scale optical fiber prefabricating stick has been the essential means that promote the market competitiveness.In OVD technique, the preform loose media internal diameter of deposition is larger, and sedimentation rate is faster, and raw material availability is higher, produces large-sized preform loose media and will reduce greatly the raw material manufacturing cost of prefabricated rods.
Therefore, how sintering large-scale optical fiber prefabricating stick loose media, becomes the key point of prefabricated rods to large size development.
Summary of the invention
In view of this, the invention provides a kind of sintering method of large-scale optical fiber prefabricating stick loose media, to improve outer gas-phase deposition unstripped gas utilization ratio, reduce production costs.
The present invention also provides a kind of agglomerating plant of large-scale optical fiber prefabricating stick loose media.
For achieving the above object, the invention provides following technical scheme:
A kind of sintering method of large-scale optical fiber prefabricating stick loose media, the large-scale optical fiber prefabricating stick loose media (more than Φ 250mm) that outer gas-phase deposition is made is put into quartzy furnace core tube and is carried out sintering, array mode in the nested graphite heater in the outside of described quartzy furnace core tube and graphite heat preservation member heats, and is also arranged with sealing body of heater in the surrounding of described graphite heater.
Preferably, the internal diameter size of described quartzy furnace core tube is greater than 400mm.
Preferably, in described sealing body of heater, be provided with for isolated O
2n
2securing system.
Preferably, sealing body of heater pressure control system is installed in described sealing body of heater, N2 shielding gas is flowed according to certain orientation, form steady air flow pressure field.
Preferably, offer air outlet in the bottom of described sealing body of heater, described N
2the N of securing system
2shielding gas from top to bottom flows.
Preferably, N when operation
2the flow control of shielding gas is at 10L/Min, poor being controlled in 0-10Pa of described quartzy furnace core tube external and internal pressure.
Preferably, in described sealing body of heater, be provided with the cooling water recirculation system for regulating described Sealing furnace temperature.
Preferably, arrive after sintering temperature, pass into siccative, preform loose media starts decline and be equipped with certain rotational velocity with constant speed, make preform loose media thermally equivalent, control furnace body temperature and change with gradual manner, start to carry out sintering process.
An agglomerating plant for large-scale optical fiber prefabricating stick loose media, adopts above-mentioned method sintering large-scale optical fiber prefabricating stick loose media, comprising:
For the quartzy furnace core tube of sintering preform loose media;
Be nested in the outside of described quartzy furnace core tube, for the graphite heater that heats and the combination of graphite heat preservation member;
Be set in the sealing body of heater of described graphite heater surrounding;
Be arranged in described sealing body of heater for isolated O
2n
2securing system;
Be arranged in described sealing body of heater for driving N
2shielding gas is according to the mobile sealing body of heater pressure control system of certain orientation;
Be arranged in described sealing body of heater for regulating the cooling water recirculation system of described Sealing furnace temperature;
For driving the rolling clamp of preform loose media action.
Can find out from above-mentioned technical scheme, the sintering method of large-scale optical fiber prefabricating stick loose media provided by the invention, improve by the furnace binding to sintering oven, the combined heated mode that adopts nested graphite heater and graphite heat preservation member outside clean quartzy furnace core tube is to substitute the array mode of nested molybdenum disilicide heating member outside original clean silica tube.Molybdenum disilicide well heater is due to the performance limitations of himself on the one hand, and temperature can not rise so high, otherwise very easily causes that heating member scorification, body of heater damage; Because temperature is low, reach fully sintered to sacrifice sintering velocity on the other hand, operating efficiency is low, and efficiency is low, and sintering time is lengthened, and more causes the further rising of sintering gas consumption cost and power cost.And the body of heater of graphite components is because itself feature can well make up the deficiency of molybdenum disilicide material, to protect whole heating system effectively to move, realizes the sintering process of large-scale optical fiber prefabricating stick loose media.
The present invention also provides a kind of device of the sintering large-scale optical fiber prefabricating stick loose media of having applied aforesaid method.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The structural representation of the agglomerating plant of the large-scale optical fiber prefabricating stick loose media that Fig. 1 provides for the embodiment of the present invention;
Qualified plug cored ratio and extension front and back geometrical dimension comparison diagram that Fig. 2 provides for the embodiment of the present invention;
The significant parameter figure of the optical fiber that Fig. 3 provides for the embodiment of the present invention;
Fig. 4 is the external diameter scintigram of the preform after sintering of the present invention.
Wherein, 1 is rolling clamp, and 2 is large-scale optical fiber prefabricating stick loose media, and 3 is quartzy furnace core tube, and 4 is graphite heater, and 5 is N2 securing system, and 6 is cooling water recirculation system, and 7 is sealing body of heater pressure control system, and 8 is sealing body of heater.
Embodiment
Core of the present invention has been to disclose a kind of sintering method of large-scale optical fiber prefabricating stick loose media, to improve outer gas-phase deposition unstripped gas utilization ratio, reduces production costs.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, the structural representation of the agglomerating plant of the large-scale optical fiber prefabricating stick loose media that Fig. 1 provides for the embodiment of the present invention.
The sintering method of the large-scale optical fiber prefabricating stick loose media that the embodiment of the present invention provides, more than the large-scale optical fiber prefabricating stick loose media 2(Φ 250mm that outer gas-phase deposition is made) put into quartzy furnace core tube 3 and carry out sintering, its core inventive point is, array mode in the nested graphite heater 4 in the outside of quartzy furnace core tube 3 and graphite heat preservation member heats, also be arranged with sealing body of heater 8 in the surrounding of graphite heater 4, use high temperature resistant asbestos material to seal the gap between quartzy furnace core tube 3 and sealing body of heater 8, utilize said structure temperature required when reaching sintering fast, make the vitrifying completely of large-scale optical fiber prefabricating stick loose media.
Can find out from above-mentioned technical scheme, the sintering method of the large-scale optical fiber prefabricating stick loose media that the embodiment of the present invention provides, improve by the furnace binding to sintering oven, adopt in the combined heated mode of the nested graphite heater 4 in the outside of quartzy furnace core tube 3 and graphite heat preservation member to substitute the array mode of nested molybdenum disilicide heating member outside original clean silica tube.Molybdenum disilicide well heater is due to the performance limitations of himself on the one hand, and temperature can not rise so high, otherwise very easily causes that heating member scorification, body of heater damage; Because temperature is low, reach fully sintered to sacrifice sintering velocity on the other hand, operating efficiency is low, and efficiency is low, and sintering time is lengthened, and more causes the further rising of sintering gas consumption cost and power cost.And the body of heater of graphite components is because itself feature can well make up the deficiency of molybdenum disilicide material, to protect whole heating system effectively to move, realizes the sintering process of large-scale optical fiber prefabricating stick loose media.
In order to adapt to the sintering of large-scale optical fiber prefabricating stick loose media, the present invention has further improved the internal diameter size of quartzy furnace core tube 3, with prevent large-scale optical fiber prefabricating stick loose media in sintering process, be unlikely to because of caliber is too small can not sintering, or cause galled spots.The large-scale optical fiber prefabricating stick loose media 2 of processing Φ 300mm here, the internal diameter size of quartzy furnace core tube 3 is greater than 400mm.Certainly, those skilled in the art can adjust the internal diameter size of quartzy furnace core tube 3 accordingly according to practical situation, do not repeat them here.
As the further of technique scheme improved and supplemented, the present invention also comprises following additional technical feature:
In sealing body of heater 8, be provided with for isolated O
2n
2securing system 5, adopts high-purity N2 shielding gas to completely cut off O
2, protection graphite piece, makes the graphite heater 4 at high temperature can ingress of air, and oxidative phenomena occurs.
In order further to optimize above-mentioned technical scheme, sealing body of heater pressure control system 7 is installed in sealing body of heater 3, make N
2shielding gas flows according to certain orientation, forms steady air flow pressure field.
In one embodiment of the invention, offer air outlet, N in the bottom of sealing body of heater 3
2the N of securing system 5
2shielding gas from top to bottom flows, and the oxidation of body of heater graphite piece is all right.
In another embodiment of the present invention, offer air outlet, N at the top of sealing body of heater 3
2the N of securing system
2shielding gas from bottom to top flows.N
2shielding gas flow from bottom to top with from top to bottom implement contrast, in body of heater open top, body of heater, under the condition of high temperature, produces " chimneyeffect ", bottom of furnace body graphite heat preservation member oxidation, well heater oxidation, copper electrode is because of short circuit melting.
In the time of actual job, work as N
2the flow control of shielding gas is at 40L/Min, and the external and internal pressure of quartzy furnace core tube 3 is poor while being controlled at 40Pa, and graphite piece is not oxidized, and furnace core tube distortion is serious.
Therefore N2 flow must accurately be controlled, not only anti-oxidation but also control pressure is poor.As preferably, in the time of operation, by N
2the flow control of shielding gas is at 10L/Min, and the external and internal pressure of quartzy furnace core tube 3 is poor to be controlled in 0-10Pa.Pass into the gas of quartzy furnace core tube 3 inside (as CL
2) with the N of quartzy furnace core tube 3 outsides
2the pressure difference of shielding gas is basically identical, and the quartzy furnace core tube 3 that makes to increase after internal diameter can at high temperature not be out of shape.
In order further to optimize above-mentioned technical scheme, in sealing body of heater 8, be provided with the cooling water recirculation system 6 for regulating sealing body of heater 8 temperature.Make to seal body of heater 8 under long high temperature, protection body of heater and copper electrode, do not deform or the phenomenon such as melting; Meanwhile, body of heater can be lowered the temperature fast after the end of job, to shorten the whole activity duration.Preferably, cooling water flow is controlled at 80L/Min, body of heater thermal insulation barriers outside surface is enough to cooling, and can not cause and make heating power supply the increase of output power phenomenon because calorific loss is excessive.
Arrive after sintering temperature, pass into siccative, preform loose media 1 starts decline and be equipped with certain rotational velocity with constant speed, make preform loose media 1 thermally equivalent, control furnace body temperature and change with gradual manner, start to carry out sintering process, lowering speed is controlled at 4-10mm/Min, Fast Sintering large-scale optical fiber prefabricating stick loose media 1, outside diameter tolerance is controlled at 150 ± 2mm.
The present invention also provides a kind of agglomerating plant of large-scale optical fiber prefabricating stick loose media, and its core improvement is, adopts above-mentioned method sintering large-scale optical fiber prefabricating stick loose media, comprising:
For the quartzy furnace core tube 3 of sintering preform loose media 2;
Be nested in the outside of quartzy furnace core tube 3, for the graphite heater 4 that heats and the combination of graphite heat preservation member;
Be set in the sealing body of heater 8 of graphite heater 4 surroundings;
Be arranged in sealing body of heater 8 for isolated O
2n
2securing system 5;
Be arranged in sealing body of heater 8 for driving N 2 shielding gas according to the mobile sealing body of heater pressure control system 7 of certain orientation;
Be arranged in sealing body of heater 8 for regulating the cooling water recirculation system 6 of sealing body of heater 8 temperature;
For the rolling clamp 1 that drives preform loose media 2 to move.
The sintering method of large-scale optical fiber prefabricating stick loose media provided by the invention, the large-scale optical fiber prefabricating stick loose media (more than Φ 250mm) that outer gas-phase deposition is made carries out sintering, adopt with the following method: a) improve sintering furnace body structure, type of heating adopts graphite heating mode, to reach rapid temperature rise and drop.B) improve furnace core tube scantlings of the structure, more than furnace core tube outside dimension reaches 400mm, be enough to hold large size loose media preform and prevent that surface is scratched.C) adopt N2 securing system, when protection graphite body of heater, control furnace core tube inside and outside differential pressure, prevent that furnace core tube is at high temperature out of shape.D) adopt cooling water recirculation system, protection body of heater and copper electrode.
In sum, positively effect of the present invention is:
1, manufacture method of the present invention, by the improvement to type of heating and pressure reduction control mode, successful sintering is greater than the preform loose media of Φ 250mm, has improved the production efficiency of preform.
2, manufacture method of the present invention, production cost is reduced, when production efficiency improves, does not affect quality product, and the optical parametric of preform is had no adverse effects.
Product performance contrast: with the plug of 2 qualified plugs extension making Φ 80mm prefabricated rods and Φ 150mm prefabricated rods, then carry out outer vapour deposition and produce preform loose media sintering, the indexs such as bubble bending reach requirement, qualified plug cored ratio and extension front and back geometrical dimension comparison diagram that Fig. 2 provides for the embodiment of the present invention; The significant parameter figure of the optical fiber that Fig. 3 provides for the embodiment of the present invention.
Product geometrical dimension after vitrifying: after preform loose media sintering, outside dimension fluctuates in ± 1%, the bending of rod is less than 0.5mm/m.Fig. 4 is the external diameter scintigram of the preform after sintering of the present invention.
In this specification sheets, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple modification of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (9)
1. the sintering method of a large-scale optical fiber prefabricating stick loose media, the large-scale optical fiber prefabricating stick loose media (more than Φ 250mm) that outer gas-phase deposition is made is put into quartzy furnace core tube and is carried out sintering, it is characterized in that, array mode in the nested graphite heater in the outside of described quartzy furnace core tube and graphite heat preservation member heats, and is also arranged with sealing body of heater in the surrounding of described graphite heater.
2. the sintering method of large-scale optical fiber prefabricating stick loose media according to claim 1, is characterized in that, the internal diameter size of described quartzy furnace core tube is greater than 400mm.
3. the sintering method of large-scale optical fiber prefabricating stick loose media according to claim 2, is characterized in that, is provided with for isolated O in described sealing body of heater
2n
2securing system.
4. the sintering method of large-scale optical fiber prefabricating stick loose media according to claim 3, is characterized in that, sealing body of heater pressure control system is installed in described sealing body of heater, makes N
2shielding gas flows according to certain orientation, forms steady air flow pressure field.
5. the sintering method of large-scale optical fiber prefabricating stick loose media according to claim 4, is characterized in that, offers air outlet in the bottom of described sealing body of heater, described N
2the N of securing system
2shielding gas from top to bottom flows.
6. the sintering method of large-scale optical fiber prefabricating stick loose media according to claim 3, is characterized in that, N when operation
2the flow control of shielding gas is at 10L/Min, poor being controlled in 0-10Pa of described quartzy furnace core tube external and internal pressure.
7. the sintering method of large-scale optical fiber prefabricating stick loose media according to claim 1, is characterized in that, in described sealing body of heater, is provided with the cooling water recirculation system for regulating described Sealing furnace temperature.
8. according to the sintering method of the large-scale optical fiber prefabricating stick loose media described in claim 1-7 any one, it is characterized in that, arrive after sintering temperature, pass into siccative, preform loose media starts decline and be equipped with certain rotational velocity with constant speed, make preform loose media thermally equivalent, control furnace body temperature and change with gradual manner, start to carry out sintering process.
9. an agglomerating plant for large-scale optical fiber prefabricating stick loose media, is characterized in that, adopts the method sintering large-scale optical fiber prefabricating stick loose media as described in claim 1-8 any one, comprising:
For the quartzy furnace core tube of sintering preform loose media;
Be nested in the outside of described quartzy furnace core tube, for the graphite heater that heats and the combination of graphite heat preservation member;
Be set in the sealing body of heater of described graphite heater surrounding;
Be arranged in described sealing body of heater for isolated O
2n
2securing system;
Be arranged in described sealing body of heater for driving N
2shielding gas is according to the mobile sealing body of heater pressure control system of certain orientation;
Be arranged in described sealing body of heater for regulating the cooling water recirculation system of described Sealing furnace temperature;
For driving the rolling clamp of preform loose media action.
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|---|---|---|---|
| CN201210405574.8A CN103771697A (en) | 2012-10-22 | 2012-10-22 | Sintering method and apparatus for large-size optical fiber preform loose body |
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|---|---|---|---|
| CN201210405574.8A CN103771697A (en) | 2012-10-22 | 2012-10-22 | Sintering method and apparatus for large-size optical fiber preform loose body |
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ID=50564535
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529148A (en) * | 2014-12-29 | 2015-04-22 | 长飞光纤光缆股份有限公司 | Dehydrating device and dehydrating method for optical fiber powdery loose rod body |
| CN106116122A (en) * | 2016-08-31 | 2016-11-16 | 中国建筑材料科学研究总院 | Prepare sintering equipment and the system of quartz glass |
| CN107300325A (en) * | 2017-07-25 | 2017-10-27 | 江苏亨通光纤科技有限公司 | Wire drawing induction furnace fast cooling device and its cool-down method |
| CN110316955A (en) * | 2019-07-29 | 2019-10-11 | 富通集团有限公司 | The manufacturing method of optical fiber |
| CN111960658A (en) * | 2020-09-20 | 2020-11-20 | 连云港三明石英制品有限公司 | Special OVD sintering quartz furnace with core tube positioning fixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104529148A (en) * | 2014-12-29 | 2015-04-22 | 长飞光纤光缆股份有限公司 | Dehydrating device and dehydrating method for optical fiber powdery loose rod body |
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| CN107300325A (en) * | 2017-07-25 | 2017-10-27 | 江苏亨通光纤科技有限公司 | Wire drawing induction furnace fast cooling device and its cool-down method |
| CN110316955A (en) * | 2019-07-29 | 2019-10-11 | 富通集团有限公司 | The manufacturing method of optical fiber |
| CN110316955B (en) * | 2019-07-29 | 2021-08-31 | 富通集团有限公司 | Method for manufacturing optical fiber |
| CN113371994A (en) * | 2019-07-29 | 2021-09-10 | 富通集团有限公司 | Optical fiber drawing cooling device |
| CN113371994B (en) * | 2019-07-29 | 2022-11-04 | 富通集团有限公司 | Optical fiber drawing cooling device |
| CN111960658A (en) * | 2020-09-20 | 2020-11-20 | 连云港三明石英制品有限公司 | Special OVD sintering quartz furnace with core tube positioning fixture |
| CN111960658B (en) * | 2020-09-20 | 2023-08-22 | 连云港三明石英制品有限公司 | Special OVD sintering quartz furnace with core tube positioning clamp |
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Application publication date: 20140507 |