CN107986612B - Device for preparing optical fiber base material by VAD - Google Patents
Device for preparing optical fiber base material by VAD Download PDFInfo
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- CN107986612B CN107986612B CN201711377640.4A CN201711377640A CN107986612B CN 107986612 B CN107986612 B CN 107986612B CN 201711377640 A CN201711377640 A CN 201711377640A CN 107986612 B CN107986612 B CN 107986612B
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- 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
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01406—Deposition reactors therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
- C03B2201/30—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi
- C03B2201/31—Doped silica-based glasses doped with metals, e.g. Ga, Sn, Sb, Pb or Bi doped with germanium
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/20—Specific substances in specified ports, e.g. all gas flows specified
- C03B2207/24—Multiple flame type, e.g. double-concentric flame
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2207/00—Glass deposition burners
- C03B2207/50—Multiple burner arrangements
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- Chemical Kinetics & Catalysis (AREA)
- General 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)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention relates to a VAD device for preparing optical fiber base metal, which comprises a rotary lifting hanger rod, wherein a reaction cavity for deposition is correspondingly arranged below the rotary lifting hanger rod, a core layer blast burner and a cladding layer blast burner are respectively arranged in the reaction cavity, one side of the reaction cavity is provided with an air inlet, the air inlet is communicated with an air inlet device, the other side of the reaction cavity is provided with an air suction opening, and the air suction opening is connected with an air suction device through an air suction pipeline. The invention can ensure that the core layer deposition area and the cladding layer deposition area in the cavity respectively have a better upper-lower layer flow relationship, thereby reducing the secondary deposition phenomenon of dust in the cavity; meanwhile, the flame area of the core layer can be relatively stable, so that the production stability and the product quality are improved.
Description
Technical Field
The invention relates to a device for preparing an optical fiber base material by VAD (vapor deposition), belonging to the technical field of optical fiber base material manufacturing.
Background
In the optical fiber manufacturing technology, the outside tube deposition method faces an irremediable problem, namely how to discharge the reaction product in a relatively large space, because the deposition environment is open, which is different from the inside tube method, in a relatively small closed space. In the technology of manufacturing the optical fiber base material by Vapor Axial Deposition (VAD), the same hydrolysis reaction is carried out in a relatively empty cavity, namely silicon tetrachloride and germanium tetrachloride raw materials are subjected to a chemical reaction under the action of oxyhydrogen flame to generate silicon dioxide and germanium dioxide, and a certain amount of water vapor. After the positions of the core layer blast lamp and the cladding layer blast lamp are adjusted in advance and the position of the target is preset, products are deposited and stacked on the target rod layer by layer under the guidance of cavity airflow to form a core layer and a cladding layer. Wherein the outer cladding layer only contains silicon dioxide, and the core layer also contains germanium dioxide besides the silicon dioxide. Most of the products generated in the reaction process are silicon dioxide, and the rest of the products are lost in the ambient environment except for a part of the products accumulated on the target rod.
In the optical fiber information transmission, the core layer is the main part for forming optical conduction, and the periphery of the core layer needs to be protected by a thicker outer cladding layer in order to have lower attenuation performance, so that other impurities and hydroxide ions are prevented from entering the core layer, and the outer cladding layer needs to be made larger than the core layer, so that the more raw materials are consumed by the outer cladding layer blowtorch due to larger firepower, and the less silicon tetrachloride raw material is consumed by the core layer flame; the dust in the cavity mainly comes from the cladding, and the function of the airflow in the cavity is particularly important, which is directly related to the stability of the powder rod deposition and the product quality.
If the air current is not in the same direction as having the backward flow in the cavity, the dust after the reaction can not be taken away by a large amount and discharged, and it can be attached to cavity inner wall all around or directly wafts to powder stick itself and forms the dust secondary deposit, and there is very probably blown off at cavity inner wall dust all around, and the bold granule is attached to on the powder stick being deposited, and including the deposit can be wrapped up, follow-up will form bubble and gas line and then influence product quality.
In US patent US7082791, a partition is designed between the cladding flame and the core flame, in order to stabilize the deposition environment of the core layer, which is a critical portion of the powder rod, but the pressure on both sides is different due to the hole-type partition, which aggravates the flutter of the core flame and is not good for the stable reaction; and the partition board is close to the powder rod, and the attached dust in the deposition process can float to the surface of the powder rod at any time, so that the stability of the product quality is influenced. And the core forming region, if partitioned, may form a certain pressure difference region which is not advantageous for stabilizing the deposited core portion.
Disclosure of Invention
The invention aims to solve the technical problem of providing a device for preparing an optical fiber base material by VAD, which can enable airflow in a cavity to form an upper laminar flow and a lower laminar flow corresponding to an inner core layer deposition area and a cladding layer deposition area of a reaction cavity, reduce secondary deposition of dust in the cavity, and stabilize core layer jet flame so as to improve deposition quality.
The technical scheme adopted by the invention for solving the problems is as follows: including rotatory lift jib, correspond in the below of rotatory lift jib and install the reaction cavity who is used for the deposit, be equipped with sandwich layer blowtorch and cladding blowtorch in the reaction cavity respectively, be provided with the air intake on one side of the reaction cavity, the air intake is linked together with hot blast blowpipe apparatus, and relative opposite side is provided with the suction opening, and the suction opening links to each other with updraft ventilator via the suction line, its characterized in that the suction opening pass through the shunt and be linked together with the suction line, the shunt be upper and lower divided binary channels shunt.
According to the above scheme, binary channels shunt include the equal cross-section pipeline of one section rectangle, the low slant baffle in high back before being provided with in the pipeline, separate into two upper and lower convulsions runners with equal cross-section pipeline of rectangle, wherein, go up convulsions runner longitudinal section and be trapezoidal, and the front end import is less than the rear end export, convulsions runner longitudinal section is trapezoidal down, and the front end import is greater than the rear end export.
According to the scheme, the inclination angle of the inclined partition plate is 15 ~ 25 degrees.
According to the scheme, the inlet at the front end of the upper air draft flow channel is larger than or equal to the inlet at the front end of the lower air draft flow channel.
According to the scheme, the inlet at the front end of the upper air draft flow channel corresponds to the cladding blowtorch to form an upper layer flow in the reaction cavity, and the inlet at the front end of the lower air draft flow channel corresponds to the core layer blowtorch to form a lower layer flow in the reaction cavity.
According to the scheme, the reaction cavity inner core layer blowtorch is arranged in the area with the height below the oblique partition plate of the air suction opening, and the cladding layer blowtorch is arranged in the area with the height above the oblique partition plate of the air suction opening.
According to the scheme, the inclined partition plate is an adjustable inclined partition plate with adjustable inclination angle and height.
According to the scheme, the two sides of the front end of the adjustable oblique partition plate are provided with hinged supports which are matched with the upper and lower sliding grooves on the two sides of the front end opening of the shunt, and the two sides of the rear end of the oblique partition plate are hinged with the connecting rod.
According to the scheme, the air suction pipeline is internally provided with the butterfly valve, and the opening degree is adjustable.
The invention has the beneficial effects that: 1. set up the shunt at the suction opening and be linked together with the suction line, constitute upper, two lower convulsions runners, form upper strata flow and lower laminar flow in the reaction chamber, make cladding deposit district and sandwich layer deposit district possess a different wind speed region in an open reaction chamber, the cladding region is the upper strata flow, it is trapezoidal to go up convulsions runner longitudinal section, and the front end import is less than the rear end export, there is acceleration action to the air current, it is big to add the air current, do benefit to the discharge of main dust production region dust, the sandwich layer region is the lower laminar flow, the air current is less relatively, lower convulsions runner longitudinal section is trapezoidal, and the front end import is greater than the rear end export, there is deceleration to the air current, make the sandwich layer possess a stable deposition environment, do benefit to the stable the going on of reaction when discharging the dust, and then guarantee that whole deposition process is stable. The secondary deposition of dust in the cavity is effectively reduced in the reaction process, the cleanliness of the gas atmosphere in the cavity is high, the stability of the quality of subsequent products is facilitated, and the maintenance amount of equipment is reduced. 2. The adjustable inclined partition plate is arranged, so that the inclination angle and the height of the inclined partition plate can be adjusted within a certain range, the core layer region and the cladding layer region in the reaction cavity can have better upper and lower laminar flow relations respectively aiming at different core layer structures, the secondary deposition of dust in the cavity is reduced as much as possible while the flame region of the core layer is kept relatively stable, and the production stability and the product quality are improved. 3. The rear end of the air exhaust pipeline is provided with a butterfly valve, the opening of the butterfly valve can be adjusted in a digital form at a computer end, and the butterfly valve is used for controlling the whole air exhaust amount of the reaction cavity. The invention has simple structure, reasonable arrangement and convenient use and operation.
Drawings
Fig. 1 is a schematic diagram of the overall structure of one embodiment of the present invention.
Fig. 2 is a schematic structural view of an oblique partition plate according to another embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
One embodiment of the device of the invention is shown in figure 1 and comprises a rotary lifting hanger rod 1, the rotary lifting hanger rod is connected with a vertical frame through a cantilever and a lifting slide seat, a reaction cavity 2 for deposition is correspondingly arranged below the rotary lifting hanger rod, the rotary lifting hanger rod clamps a target rod 9 through a chuck, the rotary lifting hanger rod drives a powder rod 8 growing in a continuous lengthening way to rotate and continuously pull upwards in the deposition process, a core layer blast lamp 3 and a cladding layer blast lamp 4 are respectively arranged in the reaction cavity corresponding to the rotary lifting hanger rod, the nozzles of the core layer blast lamp and the cladding layer blast lamp are inclined upwards, and the core layer blast lamp is positioned below the cladding layer blast lamp. In the deposition reaction process, a core layer blowtorch is introduced with a mixture of silicon tetrachloride and germanium tetrachloride for forming a core layer with relatively high refractive index; the cladding blowtorch is fed with silicon tetrachloride raw material steam for forming a pure silicon dioxide outer cladding. An air inlet 5 is arranged at one side of the reaction cavity and is communicated with an air inlet device, the air inlet is arranged by adopting a large-area air port, and the area of the air port is the same as or similar to the lateral area of the reaction cavity; the other side opposite to the air inlet is provided with an air suction opening 12, a flow divider is arranged at the air suction opening, the air suction opening is communicated with an air suction pipeline 6 through the flow divider 11, the flow divider 11 is a double-channel flow divider which is divided up and down, the double-channel flow divider comprises a section of rectangular uniform-section pipeline, an inclined baffle plate 10 which is high in front and low in back is arranged in the pipeline, the rectangular uniform-section pipeline is divided into an upper air suction flow channel and a lower air suction flow channel, the longitudinal section of the upper air suction flow channel is trapezoidal, the front end inlet is smaller than the rear end outlet, the longitudinal section of the lower air suction flow channel is trapezoidal, and the front end inlet; the inclination of slant baffle be 20, last convulsions runner front end import be greater than down convulsions runner front end import, last convulsions runner front end import correspond to the cladding blowtorch, form the upper layer flow in the reaction chamber, lower convulsions runner front end import correspond to the sandwich layer blowtorch, form the lower layer flow in the reaction chamber. The core layer blowtorch in the reaction cavity is arranged in the area with the height below the oblique clapboard of the air suction opening, and the cladding layer blowtorch is arranged in the area with the height above the oblique clapboard of the air suction opening. The rear end of the flow divider 11 is connected with an air suction pipeline, the air suction pipeline is communicated with an air suction device, a butterfly valve 7 is arranged in the air suction pipeline, and the opening degree of the butterfly valve is adjustable so as to adjust the air suction flow of the pipeline.
Another embodiment of the present invention is shown in fig. 2, which is different from the previous embodiment in that the inclined partition plate is an adjustable inclined partition plate with adjustable inclination angle and height, two sides of the front end of the adjustable inclined partition plate are provided with hinge supports, two sides a1 and a2 of the front port of the flow divider are correspondingly provided with upper and lower sliding grooves, the hinge supports are matched with the upper and lower sliding grooves on the two sides of the front port of the flow divider, two sides of the rear end of the inclined partition plate are respectively hinged with connecting rods A3 and a4, and the rear end of the connecting rods are hinged with two sides of the rear lower end of the flow divider through rear connecting rods a5 and a6, thereby forming the adjustable inclined partition plate. The adjustable inclined partition plate can adjust the inclination angle and the height of the inclined partition plate within a certain range aiming at different core cladding layer structures, so that the inner core layer region and the cladding layer region of the reaction cavity respectively have better upper and lower laminar flow relations.
Claims (8)
1. A VAD device for preparing optical fiber base material comprises a rotary lifting hanger rod, a reaction cavity for deposition is correspondingly arranged below the rotary lifting hanger rod, a core layer blast burner and a cladding layer blast burner are respectively arranged in the reaction cavity, an air inlet is arranged at one side of the reaction cavity, the air inlet is communicated with an air inlet device, an air suction opening is arranged at the opposite side of the reaction cavity, the air suction opening is connected with an air suction device through an air suction pipeline, and the VAD device is characterized in that the air suction opening is communicated with the air suction pipeline through a splitter, and the splitter is a double-channel splitter which is vertically divided; the double-channel flow divider comprises a section of rectangular uniform-section pipeline, an inclined partition plate with a high front part and a low rear part is arranged in the pipeline, and the rectangular uniform-section pipeline is divided into an upper air draft flow channel and a lower air draft flow channel, wherein the longitudinal section of the upper air draft flow channel is trapezoidal, the front end inlet is smaller than the rear end outlet, the longitudinal section of the lower air draft flow channel is trapezoidal, and the front end inlet is larger than the rear end outlet; the front end inlet of the upper air draft flow channel is larger than or equal to the front end inlet of the lower air draft flow channel.
2. The apparatus for manufacturing an optical fiber preform according to VAD of claim 1, wherein the inclined angle of the inclined partition plate is 15 ~ 25 °.
3. The apparatus for manufacturing an optical fiber preform according to VAD of claim 1 or 2, wherein the front end inlet of the upper draft flow path corresponds to a cladding torch to form an upper layer flow in the reaction chamber, and the front end inlet of the lower draft flow path corresponds to a core torch to form a lower layer flow in the reaction chamber.
4. The apparatus for manufacturing an optical fiber preform according to VAD of claim 1 or 2, wherein the core layer torch is disposed in the reaction chamber at a height in a region below the oblique partition plate of the suction port, and the cladding layer torch is disposed at a height in a region above the oblique partition plate of the suction port.
5. The apparatus for manufacturing an optical fiber preform according to VAD of claim 1 or 2, wherein the slant plate is an adjustable slant plate whose slant angle and height are adjustable.
6. The apparatus for manufacturing an optical fiber preform according to VAD of claim 5, wherein hinge supports are provided at both sides of a front end of the adjustable slant plate, the hinge supports are engaged with the upper and lower sliding grooves at both sides of a front end of the splitter, and both sides of a rear end of the slant plate are hinged to the connecting rod.
7. The apparatus for manufacturing an optical fiber preform according to VAD of claim 1 or 2, wherein the suction pipe is provided with a butterfly valve having an adjustable opening.
8. The apparatus for manufacturing an optical fiber preform according to VAD of claim 1 or 2, wherein the air inlet is provided with a large area of air inlet having an area equal to or similar to a lateral area of the reaction chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711377640.4A CN107986612B (en) | 2017-12-19 | 2017-12-19 | Device for preparing optical fiber base material by VAD |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711377640.4A CN107986612B (en) | 2017-12-19 | 2017-12-19 | Device for preparing optical fiber base material by VAD |
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| CN107986612A CN107986612A (en) | 2018-05-04 |
| CN107986612B true CN107986612B (en) | 2020-01-14 |
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| CN108609845B (en) * | 2018-05-17 | 2021-02-02 | 成都富通光通信技术有限公司 | Deposition reaction kettle for preparing optical fiber preform |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS59152234A (en) * | 1983-02-14 | 1984-08-30 | Nippon Telegr & Teleph Corp <Ntt> | Preparation of parent material for optical fiber |
| JPS6065742A (en) * | 1983-09-16 | 1985-04-15 | Furukawa Electric Co Ltd:The | Production of porous glass base material for optical fiber by vad method |
| JPH06316421A (en) * | 1993-04-30 | 1994-11-15 | Fujikura Ltd | Producing device for glass preform |
| JPH09118537A (en) * | 1995-10-25 | 1997-05-06 | Fujikura Ltd | Production of porous glass preform for optical fiber |
| JP3524426B2 (en) * | 1999-04-02 | 2004-05-10 | 古河電気工業株式会社 | Porous optical fiber preform manufacturing equipment |
| KR100817195B1 (en) * | 2000-10-18 | 2008-03-27 | 신에쓰 가가꾸 고교 가부시끼가이샤 | An apparatus for manufacturing a preform for porous optical fiber |
| CN101481207B (en) * | 2009-02-09 | 2012-02-15 | 富通集团有限公司 | Apparatus for manufacturing optical fiber preform part |
| CN102173571B (en) * | 2011-03-04 | 2013-01-09 | 中天科技精密材料有限公司 | Device and method for manufacturing optical fiber prefabrication rod mandrel |
| CN103241938B (en) * | 2013-04-27 | 2015-08-12 | 中天科技精密材料有限公司 | A kind of manufacture method of preform and producing apparatus thereof |
| CN104445915B (en) * | 2014-12-01 | 2017-07-21 | 长飞光纤光缆股份有限公司 | A kind of VAD methods prepare the device and method of preform |
| CN105271700A (en) * | 2015-11-16 | 2016-01-27 | 江苏通鼎光棒有限公司 | Control device for environment airflow in VAD reaction cavity and application thereof |
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