CN1253735C - Method for production of large-scale optical fiber precast product - Google Patents
Method for production of large-scale optical fiber precast product Download PDFInfo
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- CN1253735C CN1253735C CN 200410067747 CN200410067747A CN1253735C CN 1253735 C CN1253735 C CN 1253735C CN 200410067747 CN200410067747 CN 200410067747 CN 200410067747 A CN200410067747 A CN 200410067747A CN 1253735 C CN1253735 C CN 1253735C
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Abstract
The present invention relates to a method for producing a large-sized optical fiber prefabricated component. A longitudinal chemical vapor phase deposition coating layer is adopted, and a plurality of spray guns are arranged for deposition in a delaminating mode. In the deposition process, an auxiliary flame spray gun is used for heating the coating layer. The method can enlarge the deposition length of the optical fiber prefabricated component and can thicken the outer diameter of the optical fiber prefabricated component. The coating layer whose density is uniform does not crack. The method is suitable for producing the large-sized optical fiber prefabricated component with high quality.
Description
Technical field
The present invention relates to optical fiber and make the method that the fibre-optical preform in field is produced, especially adopt vertical chemical vapor deposition to produce the method for large-scale optical fiber precast product.
Background technology
Existing method of producing fibre-optical preform is mainly chemical vapor deposition method, and this method all is that lateral deposition fibre-optical preform covering is produced fibre-optical preform in the lateral deposition reaction vessel.This method is the external diameter poor stability when producing large-scale optical fiber precast product, needs to increase the fluctuation that extension device is regulated external diameter, and cost increases; Prefabricated component centrifugal force in rotation is bigger in this way, and prefabricated component and support stick ftracture easily; In the lateral deposition process, SiO to the reaction vessel inwall wafts
2Particulate can peel off the back attached to depositing the preform surfaces that forms, and forms the less zone of density, and this zone easily produces bubble when follow-up fibre-optical preform carries out vitrifacation.
Summary of the invention
The objective of the invention is to overcome the deficiency of existing horizontal chemical vapor deposition method existence and a kind of method that adopts vertical chemical vapor deposition production large-scale optical fiber precast product is provided.
The objective of the invention is to realize by following technical scheme:
A, in vertical deposition reaction container (2) vertical chemical vapor deposition fibre-optical preform (9) covering, quartz glass plug (4) vertically is clipped in lifting clamp (1) and goes up constant speed rotation and at the uniform velocity lifting,
B, vertically arrange the covering that is fixed on the fibre-optical preform that vertical deposition reaction container (2) below deposition is made of inner cladding (10), middle covering (11), surrounding layer (12) with a plurality of spray guns (6), (7), (8), the size of each layer is as follows:
Inner cladding (10) external diameter and quartz glass plug (4) external diameter ratio are 3～7;
Middle covering (11) external diameter and quartz glass plug (4) external diameter ratio are 6～10;
Surrounding layer (12) external diameter and quartz glass plug (4) external diameter ratio are 9～12,
C, spray gun (6), (7), (8) are the multilayer spray gun, middle jet pipe spray coverstock, peripheral multi-layer annular spout spray reacting gas.
D. in deposition prefabricated component covering process by being located at booster flame spray gun (5) the heating optical fiber prefabricated component covering of vertical deposition reaction container (2) below.
Below technical scheme of the present invention is described in further detail:
The first, the lifting clamp (1) that will be clipped in vertical deposition reaction container (2) through the quartz glass plug (4) that test meets the demands goes up and adjusts the height that the quartz glass plug should descend, then light inner cladding spray gun (6) earlier, lifting clamp (1) operation, light middle covering spray gun (7) and surrounding layer spray gun (8) successively according to the height that quartz glass plug (4) promotes, light booster flame spray gun (5) at last, sealed reaction vessel (2), the pressure control that container (2) is interior is at-100～250Pa.
The second, (rotation of 20rpm～35rpm) is simultaneously with (1.0mm～1.5mm/min) promote at the uniform velocity with constant speed for lifting clamp (1).Earlier to the logical raw material SiCl of inner cladding spray gun (6)
4, according to fibre-optical preform (9) hoisting depth middle covering spray gun (7) and surrounding layer spray gun (8) are led to raw material SiCl respectively then
4, through the raw material SiCl of spray gun ejection
4With reacting gas (H
2, O
2) mix, when temperature reaches 1100～1300 ℃ chemical reaction takes place, that is:
, the SiO of generation
2Build-up of particles is to quartz glass plug (4).Adopt many spray guns to prefabricated component (9) layering carry out in the chemical vapor deposition process, for guaranteeing that covering density evenly can not ftracture, adopt booster flame spray gun (5) spray hydrogen one oxygen flame to improve the temperature of preform surfaces, and then improve the density on surface, increase preform surfaces intensity.
Three, can detect prefabricated component (9) external diameter in fibre-optical preform (9) the covering deposition process and whether reach desired value, can be by regulating the trace adjusting that pulling speed realizes external diameter, until the fibre-optical preform of making target.
After making the fibre-optical preform of target, this prefabricated component is put on the vitrification device its glass transparentization, thereby obtains glass optical fiber prefabricating stick, be put into again and carry out fibre-optical drawing on the wire-drawing equipment, obtain light transmitting fiber.
The invention has the beneficial effects as follows to overcome the deficiency that horizontal chemical vapor deposition method exists, the one, adopt vertical deposition that prefabricated component is increased on deposition length, can deposit large scale prefabricated of length 2000mm, but more than single rod pulling optical fiber 1200km; The 2nd, the method for many spray guns of employing stratified sedimentation can make the external diameter of the prefabricated component covering of deposition reach 300～350mm, has improved deposition efficiency, and the optical fiber prefabricating rod outside diameter after the vitrifacation can reach more than the 120mm; The 3rd, adopt the booster flame spray gun that prefabricated component is heated in the deposition process and can make covering density even, increase the intensity of preform surfaces, can not ftracture.
Description of drawings
Fig. 1 adopts the present invention to produce the synoptic diagram of the relative position of the outer lifting clamp of vertical deposition reaction container of large-scale optical fiber precast product and the spray gun in the container, booster flame spray gun, fibre-optical preform, container, and Fig. 2 is the cross sectional representation that adopts the fibre-optical preform that the present invention makes.
In Fig. 1, Fig. 2,1. lifting clamp, 2. vertical deposition reaction container, 3. exhausr port, 4. quartz glass plug, 5. booster flame spray gun, 6. inner cladding spray gun, 7. middle covering spray gun, 8. surrounding layer spray gun, 9. fibre-optical preform, 10. fibre-optical preform inner cladding, 11. covering in the middle of the fibre-optical preform, 12. fibre-optical preform surrounding layers.
Embodiment
With two embodiment the specific embodiment of the present invention is described below.
Embodiment 1:
Make the fibre-optical preform of Φ 280mm * 1800mm.
Vertically be clipped on the anchor clamps with Φ 35mm * 2100mm quartz glass plug earlier, the entire container internal control is made as negative pressure-120Pa.Anchor clamps are with constant speed 30rpm rotation, at the uniform velocity promote with the speed of 1.5mm/min.Is reference point decline 1900mm with the quartz glass plug with the internal layer spray gun, carry out the igniting of each spray gun, put the internal layer spray gun earlier, put middle covering spray gun and outer spray gun successively according to the height that promotes, rearmost point booster flame spray gun, sealing entire reaction container, the pressure control in the container is at negative pressure-150Pa.To the logical raw material of inner cladding spray gun, the height according to each spray gun leads to raw material to middle covering spray gun and surrounding layer spray gun again, through the raw material SiCl of spray gun ejection
4Fully and gas (H
2, O
2) mix, when reaching certain temperature (1100～1300 ℃) back chemical reaction takes place, generation SiO
2Build-up of particles is to the quartz glass plug.
For improving raw material availability, inner cladding spray gun and middle covering spray gun adopt 9 layers of lance tube, and the surrounding layer spray gun adopts 4 layers of lance tube, and the booster flame spray gun adopts 2 layers of lance tube.Each spray gun is followed successively by to outer field raw material and distribution of gas from internal layer:
| Spray gun | 1 layer | 2 layers | 3 layers | 4 layers | 5 layers | 6 layers | 7 layers | 8 layers | 9 layers |
| Inner cladding spray gun (9 layers) | SiCl 4 | H 2 | Ar | O 2 | Ar | H 2 | Ar | O 2 | N 2 |
| Middle covering spray gun (9 layers) | SiCl 4 | H 2 | Ar | O 2 | Ar | H 2 | Ar | O 2 | N 2 |
| Surrounding layer spray gun (4 layers) | SiCl 4 | H 2 | Ar | - | - | - | - | - | - |
| The shop helps flame gun (2 layers) | O 2 | H 2 | - | - | - | - | - | - |
The external diameter of control prefabricated component is at 280mm, when the length of prefabricated component reaches desired value 1800mm, this prefabricated component is taken off from vertical deposition reaction container, to the enterprising oozy glassization of vitrified equipment, the temperature of vitrifacation stove is controlled at 1600 ℃, feeds chlorine 250sccm, helium 15000sccm, prefabricated component is made its glass transparentization through the heating zone, thereby obtain the quartz glass optical fiber prefabricated rods.This prefabricated rods can draw 1000 kilometers light transmitting fibers.
Embodiment 2:
Make the fibre-optical preform of Φ 350mm * 1800mm.
Vertically be clipped on the anchor clamps with Φ 40mm * 2100mm quartz glass plug earlier, the entire container internal control is made as negative pressure-120Pa.Anchor clamps are with constant speed 30rpm rotation, at the uniform velocity promote with the speed of 1.0mm/min.Is reference point decline 1900mm with the quartz glass plug with the internal layer spray gun, carry out the igniting of each spray gun, put the internal layer spray gun earlier, put middle covering spray gun and outer spray gun successively according to the height that promotes, rearmost point booster flame spray gun, sealing entire reaction container, the pressure control in the container is at negative pressure-250Pa.To the logical raw material of inner cladding spray gun, the height according to each spray gun leads to raw material to middle covering spray gun and surrounding layer spray gun again, through the raw material SiCl of spray gun ejection
4Fully and gas (H
2, O
2) mix, when reaching certain temperature (1100～1300 ℃) back chemical reaction takes place, generation SiO
2Build-up of particles is to the glass plug of quartz.
For improving raw material availability, inner cladding spray gun and middle covering spray gun adopt 9 layers of lance tube, and the surrounding layer spray gun adopts 4 layers of lance tube, and the booster flame spray gun adopts 2 layers of lance tube.Each spray gun is followed successively by to outer field gas raw material and distribution of gas from internal layer:
| Spray gun | 1 layer | 2 layers | 3 layers | 4 layers | 5 layers | 6 layers | 7 layers | 8 layers | 9 layers |
| Inner cladding spray gun (9 layers) | SiCl 4 | H 2 | Ar | O 2 | Ar | H 2 | Ar | O 2 | N 2 |
| Middle covering spray gun (9 layers) | SiCl 4 | H 2 | Ar | O 2 | Ar | H 2 | Ar | O 2 | N 2 |
| Surrounding layer spray gun (4 layers) | SiCl 4 | H 2 | Ar | - | - | - | - | - | - |
| The shop helps flame gun (2 layers) | O 2 | H 2 | - | - | - | - | - | - |
The external diameter of control prefabricated component is at 350mm, when the length of prefabricated component reaches desired value 1800mm, this prefabricated component is taken off from vertical deposition reaction container, to the enterprising oozy glassization of vitrified equipment, the temperature of vitrifacation stove is controlled at 1600 ℃, feeds chlorine 250sccm, helium 15000sccm, fibre-optical preform is made its glass transparentization through the heating zone, thereby obtain the quartz glass optical fiber prefabricated rods.This prefabricated rods can draw 1200 kilometers light transmitting fibers.
Claims (1)
1, a kind of method of large-scale optical fiber precast product production is characterized in that:
A. vertical chemical vapor deposition fibre-optical preform covering in vertical deposition reaction container, quartz glass plug vertically are clipped on the lifting clamp constant speed rotation and at the uniform velocity promote,
B. vertically arrange with a plurality of spray guns and be fixed on the fibre-optical preform covering that vertical deposition reaction container below deposition is made of inner cladding, middle covering, surrounding layer, the size of each layer is as follows:
The inner cladding external diameter is 3～7 with quartz glass plug external diameter ratio;
Middle covering external diameter is 6～10 with quartz glass plug external diameter ratio;
The surrounding layer external diameter is 9～12 with quartz glass plug external diameter ratio,
C. spray gun is the multilayer spray gun, middle jet pipe spray coverstock, and peripheral multi-layer annular spout spray reacting gas,
D. in deposition prefabricated component covering process by being located at the booster flame spray gun heating optical fiber prefabricated component covering below vertical deposition reaction container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067747 CN1253735C (en) | 2004-10-29 | 2004-10-29 | Method for production of large-scale optical fiber precast product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410067747 CN1253735C (en) | 2004-10-29 | 2004-10-29 | Method for production of large-scale optical fiber precast product |
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| Publication Number | Publication Date |
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| CN1603867A CN1603867A (en) | 2005-04-06 |
| CN1253735C true CN1253735C (en) | 2006-04-26 |
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|---|---|---|---|
| CN 200410067747 Active CN1253735C (en) | 2004-10-29 | 2004-10-29 | Method for production of large-scale optical fiber precast product |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103011579B (en) * | 2012-12-27 | 2015-05-20 | 中天科技精密材料有限公司 | Online annealing device and online annealing method for large-size optical fiber preform rod |
| JP6570489B2 (en) * | 2016-08-16 | 2019-09-04 | 信越化学工業株式会社 | Equipment for producing glass particulate deposits |
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