CN207435310U - A kind of sintering equipment of the loose powder stick of large-scale optical fiber - Google Patents
A kind of sintering equipment of the loose powder stick of large-scale optical fiber Download PDFInfo
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- CN207435310U CN207435310U CN201721275275.1U CN201721275275U CN207435310U CN 207435310 U CN207435310 U CN 207435310U CN 201721275275 U CN201721275275 U CN 201721275275U CN 207435310 U CN207435310 U CN 207435310U
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- furnace core
- core tube
- powder stick
- kuppe
- loose powder
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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]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
- C03B37/0146—Furnaces therefor, e.g. muffle tubes, furnace linings
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- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The utility model discloses a kind of sintering equipments of the loose powder stick of large-scale optical fiber, including sintering furnace core tube and rod feeder, rod feeder is used to implement loose powder stick and realizes upper and lower and rotary motion in sintering furnace core tube, air inlet is equipped in sintering furnace core tube bottom, top is equipped with gas outlet, the lower section that furnace core inside pipe wall is located at loose powder stick is equipped with kuppe, and the air scoop is the up-small and down-big taper air scoop of internal diameter, and the air scoop is located at the top of air inlet.For the utility model by setting kuppe, kuppe causes reaction gas more integrated distribution in the middle part of sintering furnace core tube, can preferably be contacted with loose barred body；By reducing actual internal area, gas flow rate is increased, enhances the less turbulence of gas, so as to reduce the thickness of loose barred body surface air film, it is more advantageous to reaction gas to diffuse to inside loose barred body, so as to which the low and homogeneous preform of OH ion concentrations be made, and reduces resource consumption.
Description
Technical field
The utility model belongs to preform manufacturing technology field more particularly to a kind of loose powder stick of large-scale optical fiber
Sintering equipment.
Background technology
With policy support of the country to information industry --- fiber to the home and integration of three networks etc. are in full swing.Optic communication
Industry is fast-developing, and the preform industry in China achieves significant progress.But China's optical fiber prefabricating industry no matter work
Skill or equipment and technology compared with international most advanced level, still have a certain distance, are finally embodied in the cost of prefabricated rods.
And the most effectual way for solving prefabricated rods cost predicament is exploitation large-scale optical fiber prefabricating stick technology and realizes fully synthetic predispersed fiber
The production domesticization of stick process materials processed.Axial vapor deposition method (VAD) and outside vapor deposition (OVD) are suitble to production large scale light
Fine prefabricated rods, and with production efficiency is high, the advantages such as at low cost.
The powder stick that either OVD or VAD process deposits are prepared all is a kind of loose porous body.It is dredged again by post-depositional
Loose body is sintered, and first dehydration removal residual OH ions, then vitrifying produces the predispersed fiber of transparent low moisture content
Stick processed.Generally chlorine is used as dehydrating agent.At high temperature, gas is aided in using helium etc., is gone using chlorine isoreactivity gas
Except the OH ions in loosening body and moisture, chemical equation are as follows：
2Si-OH+2Cl2=2Si-Cl+O2+2HCl
Because the fundamental vibration absworption peak of Si-Cl keys is located near 25 μm, and the fundamental frequency absworption peak of OH ions is located at
Near 1383nm, it is possible to judge that the OH ions of plug are gone by measuring pad value of the optical fiber near 1383nm i.e. water peak
Except effect.
Basically, above-mentioned reaction is a kind of gas and solid heterogeneous reaction, and chlorine has to pass through loose barred body surface air film,
It is spread again by loose barred body internal gutter, finally contacts with reactant, and then can just react.
In the prior art, the mixture of reactivity gas and auxiliary gas is passed through from the bottom of sintering reactor, instead
Admixture of gas after answering is discharged from top.
In addition, the internal diameter of the reactor of sintering is more sufficiently large than the outer diameter of loose barred body, it just can guarantee that loose media is being sintered
The tube wall of reactor will not be encountered in the process.The very low annular of pressure drop is formed so between barred body and reactor wall to lead to
Road, a large amount of gases include reaction gas chlorine and auxiliary gas helium etc. and just fail effectively to participate in from the passage outflow reactor
Reaction, but also the concentration distribution of various gases and VELOCITY DISTRIBUTION are very uneven in reactor.Not only cause the wave of resource
Take, also reduce the removal effect of the quality of sintering, especially OH ions.In order to reduce preform and optical fiber cost,
Powder stick size and agglomerating plant size develop instantly toward enlargement direction, and the problem is also more and more prominent.
Chinese patent CN205590559U discloses a kind of low attenuation optical fiber prefabricated rods production dehydration device, by going out
Gas port sets moisture content detection device for detecting the moisture in discharge gas, and threshold is set in moisture content detection device
Value, by the moisture concentration detected with threshold value compared with and in this, as feedback signal come control the heating of heating unit and
Moisture that is no, being indirectly controlled in preform.Chinese patent CN101426742B discloses a kind of optical fiber base material
Manufacturing method hangs on base material in the furnace core tube for possessing heating region, and base material is made to move through the heating zone from the bottom up
Domain carries out dehydration procedure in first environment with the first temperature；After the base material is made to move downwards, with second in second environment
Temperature simultaneously carries out vitrifying process from the bottom up again, and the attenuation of optical fiber prepared by base material is reduced simultaneously into bar mode by such
Improve the uniformity to decay along base material stick length direction.But above-mentioned patent does not refer to the concentration distribution of gas in sintering equipment and fills
Divide Utilizing question.
Utility model content
The technical problem to be solved by the utility model is to provide kind in view of the deficiency of the prior art to make instead
Gas is answered to concentrate among reactor so that reaction gas can be contacted preferably with loose barred body more fully participates in reaction, from
And the low and homogeneous preform of OH ion concentrations is made, and the sintering for the loose powder stick of large-scale optical fiber for reducing resource consumption
Device..
Technical solution is used by the utility model：A kind of sintering equipment of the loose powder stick of large-scale optical fiber, feature
It is：It is clamped including sintering furnace core tube and rod feeder, upper end by target rod, and passes through quartzy push rod and be connected with rod feeder,
Rod feeder is used to implement loose powder stick and upper and lower and rotary motion, the quartz push rod and sintering furnace is realized in sintering furnace core tube
The cover plate for sealing sliding configuration of core pipe upper end, is equipped with air inlet, top is equipped with gas outlet, furnace core tube in sintering furnace core tube bottom
The lower section that inner wall is located at loose powder stick is equipped with kuppe, and the opening of the kuppe is corresponding with the lower end of loose powder stick, described
Air scoop is the up-small and down-big taper air scoop of internal diameter, and the air scoop is located at the top of air inlet, described to be sintered outside furnace core tube
Heating furnace is provided with, and heating furnace is located at the top of kuppe.
By above-mentioned technical proposal, the opening diameter of the kuppe, which accounts for, is sintered the ratio of furnace core tube internal diameter as 10%-90%.
By above-mentioned technical proposal, the kuppe forms an angle with sintering furnace core tube inner wall, and the angle is 10-90 °.
By above-mentioned technical proposal, the material of the kuppe is quartz glass.
By above-mentioned technical proposal, the thickness of the kuppe is 2-8mm.
By above-mentioned technical proposal, distance of the water conservancy diversion cover opening away from loose powder stick lower end is 10-1000mm.
Having the beneficial effect that acquired by the utility model：
1st, for the utility model by setting kuppe, kuppe causes reaction gas more integrated distribution in sintering furnace core tube
Middle part can preferably be contacted with loose barred body；By reducing actual internal area, gas flow rate is increased, enhances the rapids of gas
Traverse degree so as to reduce the thickness of loose barred body surface air film, is more advantageous to reaction gas and diffuses to inside loose barred body, from
And the low and homogeneous preform of OH ion concentrations is made, and reduce resource consumption；
2nd, after the dehydration of entire loose powder stick is completed, the position heating that dehydration terminates is parked in, then completes glass
Change step, can prevent loose powder stick when not completing vitrifying with regard to loose after rod withdrawal to the dehydration being sintered caused by furnace core tube top
So that the optical fiber that the prefabricated rods institute wire drawing being sintered goes out is decayed near 1383nm, (water peak) increases the secondary water suction of powder stick, favorably
In the optical fiber for the low pad value (water peak) being made near 1383nm；
3rd, by setting kuppe, contact reactant of the gas more fully with loose powder stick, reaction gas is more abundant
Ground participates in reaction, can more effectively reduce OH ion concentrations in preform, so as to which low water peak fiber be made.Also increase simultaneously
The utilization rate of reaction gas, reduces the consumption of the materials such as chlorine, helium.
Description of the drawings
Fig. 1 is the schematic diagram of the sintering equipment of the utility model.
Fig. 2 exists for the optical fiber that preform institute wire drawing prepared in the utility model embodiment goes out and conventional apparatus
The contrast schematic diagram of 1383nm attenuation (water peak) nearby.
The chlorine consumption of unit mass agglomerated powder stick and the comparison diagram of conventional apparatus in Fig. 3 the utility model embodiments.
Specific embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of sintering equipment of the loose powder stick of large-scale optical fiber is present embodiments provided, including being sintered furnace core
Pipe 6 and rod feeder 1, the upper end of loose powder stick 7 are clamped by target rod 5, and are passed through quartzy push rod 2 and be connected with rod feeder 1, are sent
Bar device 1 is used to implement loose powder stick and upper and lower and rotary motion, the quartz push rod 2 and sintering furnace is realized in sintering furnace core tube
The sealing sliding configuration of cover board 3 of core pipe upper end, air inlet 12 is equipped in sintering furnace core tube bottom, air inlet is filled with gas supply
It puts to be connected and can be passed through the process gas such as chlorine, helium；Top is equipped with gas outlet 4, and gas outlet is connected with exhaust system so as to timely
The exhaust gas generated after discharge sintering；The lower section that furnace core inside pipe wall is located at loose powder stick is equipped with kuppe 11, the material of the kuppe
Matter is quartz glass, and the thickness of the kuppe is 2-8mm.The opening of the kuppe 11 is opposite with the lower end of loose powder stick 7
Should, distance of the water conservancy diversion cover opening away from loose powder stick lower end is 10-1000mm.The air scoop 11 is up-small and down-big for internal diameter
Taper air scoop, the air scoop is located at the top of air inlet 12, and the sintering furnace core tube is provided outside heating furnace 8, and adds
Hot stove 8 is located at the top of kuppe 11.The ratio that the opening diameter of the kuppe accounts for sintering furnace core tube internal diameter is 10%-
90%.The kuppe forms an angle 10 with sintering furnace core tube inner wall, and the angle is 10-90 °.
The present embodiment additionally provides the method being sintered to loose powder stick using above-mentioned sintering equipment, below by 4
A specific example illustrates.
Embodiment 1
Loose powder stick 7 is clamped in quartzy 2 lower end of push rod, loose powder stick 7 is sent by sintering furnace core tube by rod feeder 1
6 tops；Loose powder stick 7 in place after, the cover board 3 at sintering furnace core tube 6 top also covers simultaneously；Using induction heater 8 by furnace core
Temperature is improved to 1000 DEG C in pipe, and the process gas such as chlorine, the helium of specified amount are passed through in furnace core tube by air inlet 12,
The flow 0.05slm of chlorine, the flow 5slm of helium are opened rod feeder 1 and are sent loose powder stick 7 downwards with speed 10mm/min
Stick, and with speed 1rpm rotations, by 8 hot-zone of heating furnace, after the dehydration procedure of entire loose powder stick 7 is completed, which stops
In the position that dehydration terminates, temperature in furnace core tube is improved to 1500 DEG C using heating furnace 8, and passes through air inlet in furnace core tube
The process gas such as chlorine, the helium of specified amount are passed through, chlorine flowrate 0.05slm, the flow 5slm of helium open rod feeder 1
Loose powder stick 7 is sent to stick upwards with command speed 1mm/min, and rotated simultaneously through furnace hot zone with speed 1rpm, complete
The vitrification procedures of entire loose powder stick 7, are made transparent preform.The gas passes through in sintering furnace core tube inner wall increasing
The kuppe 11 added is contacted again with loose powder stick 7 after guiding, reacted, and the diameter of the opening 9 of the kuppe 11 accounts for sintering furnace
The ratio 10% of 6 diameter of core pipe, kuppe 11 and 10 ° of 6 inner wall angle of sintering furnace core tube, the thickness 2mm of kuppe 11.
Embodiment 2
Loose powder stick 7 is clamped in quartzy 2 lower end of push rod, loose powder stick 7 is sent by sintering furnace core tube by rod feeder 1
6 tops；Loose powder stick 7 in place after, the cover board 3 at sintering furnace core tube 6 top also covers simultaneously；Using induction heater 8 by furnace core
Temperature is improved to 1200 DEG C in pipe, and in process gas such as interior chlorine, the helium that specified amount is passed through by air inlet 12 of furnace core tube 6
Body, the flow 1slm of chlorine, the flow 10slm of helium opens rod feeder 1 loose powder stick 4 is downward with speed 15mm/min
Stick is sent, and passes through 8 hot-zone of heating furnace, after the dehydration procedure of entire loose powder stick 7 is completed, the barred body with speed 3rpm rotations
Be parked in dehydration terminate position, temperature in furnace core tube 6 is improved to 1600 DEG C using heating furnace 8, and in furnace core tube by into
Gas port 12 is passed through the process gas such as the chlorine of specified amount, helium, chlorine flowrate 1slm, stick is sent in the flow 10slm of helium, unlatching
Device 1 send loose powder stick 7 to stick upwards with command speed 2mm/min, and speed 3rpm is rotated simultaneously through 8 hot-zone of heating furnace,
The vitrification procedures of entire loose powder stick 7 are completed, transparent preform is made.The gas passes through in sintering furnace core tube 6
It contacts, react with loose powder stick again after the increased kuppe guiding of inner wall, 9 diameter of opening of the kuppe 11 accounts for sintering furnace
The ratio 50% of core pipe diameter, kuppe and 60 ° of sintering furnace core tube inner wall angle, the thickness 5mm of kuppe.
Embodiment 3
Loose powder stick 7 is clamped in quartzy 2 lower end of push rod, loose powder stick 7 is sent by sintering furnace core tube by rod feeder 1
6 tops；Loose powder stick 7 in place after, the cover board at sintering furnace core tube 6 top also covers simultaneously；Using induction heater 8 by furnace core tube
Interior temperature is improved to 1300 DEG C, and is passed through the process gas such as chlorine, the helium of specified amount in the furnace core tube 6 by air inlet 12,
The flow 2slm of chlorine, the flow 20slm of helium is opened rod feeder 1 and is sent loose powder stick 7 downwards with speed 20mm/min
Stick, and with speed 5rpm rotations, by furnace hot zone, after the dehydration procedure of entire loose powder stick 7 is completed, which stops
In the position that dehydration terminates, temperature in furnace core tube 6 is improved to 1700 DEG C using heating furnace 8, and passes through air inlet in furnace core tube 6
Mouth 12 is passed through the process gas such as the chlorine of specified amount, helium, and chlorine flowrate 2slm, the flow 20slm of helium open rod feeder
1 send loose powder stick 7 to stick upwards with command speed 6mm/min, and is rotated simultaneously through furnace hot zone with speed 5rpm, completes
The vitrification procedures of entire loose powder stick, are made transparent preform.The gas passes through in sintering 6 inner wall increasing of furnace core tube
The kuppe 11 added is contacted again with loose powder stick 7 after guiding, reacted, and 9 diameter of opening of the kuppe 11 accounts for sintering furnace core
The ratio 90% of 6 diameter of pipe, kuppe and 90 ° of sintering furnace core tube inner wall angle, the thickness 8mm of kuppe.
Embodiment 4
Conventional apparatus as a comparison, kuppe is not provided in the sintering furnace core tube.Loose powder stick 7 is clamped in quartz
Loose powder stick 7 is sent into 6 top of sintering furnace core tube by 2 lower end of push rod by rod feeder 1；Loose powder stick 7 in place after, sintering furnace
The cover board 3 at 6 top of core pipe also covers simultaneously；Temperature in furnace core tube 6 is improved to 1300 DEG C, and in stove using induction heater 8
It is passed through the process gas such as chlorine, the helium of specified amount in core pipe 6 by air inlet 12, the flow 3slm of chlorine, the flow of helium
30slm is opened rod feeder 1 and send loose powder stick 7 to stick downwards with speed 20mm/min, and added with being passed through with speed 5rpm rotations
Hot stove hot-zone, after the dehydration procedure of entire loose powder stick 7 is completed, which is parked in the position that dehydration terminates, and utilizes heating furnace
Temperature in furnace core tube is improved to 1700 DEG C, and in works such as interior chlorine, the helium that specified amount is passed through by air inlet 12 of furnace core tube 6
Skill gas, chlorine flowrate 3slm, the flow 30slm of helium, open rod feeder by loose powder stick with command speed 6mm/min to
On send stick, and speed 5rpm is rotated simultaneously through furnace hot zone, is completed the vitrification procedures of entire loose powder stick, is made transparent
Preform.The experimental data drawn is as shown in Figures 2 and 3.
Claims (6)
1. a kind of sintering equipment of the loose powder stick of large-scale optical fiber, it is characterised in that：Including being sintered furnace core tube and rod feeder, on
End is clamped by target rod, and is passed through quartzy push rod and be connected with rod feeder, and rod feeder is used to implement loose powder stick in sintering furnace
It realizes in core pipe and is configured up and down with rotary motion, the quartz push rod and the cover plate for sealing sliding of sintering furnace core tube upper end,
It is sintered furnace core tube bottom and is equipped with air inlet, top is equipped with gas outlet, and the lower section that furnace core inside pipe wall is located at loose powder stick is equipped with water conservancy diversion
Cover, the opening of the kuppe is corresponding with the lower end of loose powder stick, and the air scoop is the up-small and down-big taper air guide of internal diameter
Cover, the air scoop are located at the top of air inlet, and the sintering furnace core tube is provided outside heating furnace, and heating furnace is located at kuppe
Top.
2. sintering equipment according to claim 1, it is characterised in that：The opening diameter of the kuppe accounts for sintering furnace core tube
The ratio of internal diameter is 10%-90%.
3. sintering equipment according to claim 1 or 2, it is characterised in that：The kuppe with sintering furnace core tube inner wall into
Certain angle, the angle are 10-90 °.
4. sintering equipment according to claim 1 or 2, it is characterised in that：The material of the kuppe is quartz glass.
5. sintering equipment according to claim 1 or 2, it is characterised in that：The thickness of the kuppe is 2-8mm.
6. sintering equipment according to claim 1 or 2, it is characterised in that：The water conservancy diversion cover opening is away from loose powder stick lower end
The distance in portion is 10-1000mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721275275.1U CN207435310U (en) | 2017-09-30 | 2017-09-30 | A kind of sintering equipment of the loose powder stick of large-scale optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721275275.1U CN207435310U (en) | 2017-09-30 | 2017-09-30 | A kind of sintering equipment of the loose powder stick of large-scale optical fiber |
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| Publication Number | Publication Date |
|---|---|
| CN207435310U true CN207435310U (en) | 2018-06-01 |
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| CN201721275275.1U Active CN207435310U (en) | 2017-09-30 | 2017-09-30 | A kind of sintering equipment of the loose powder stick of large-scale optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277716A (en) * | 2021-05-27 | 2021-08-20 | 四川神光石英科技有限公司 | Equipment for producing high-quality synthetic quartz glass |
-
2017
- 2017-09-30 CN CN201721275275.1U patent/CN207435310U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113277716A (en) * | 2021-05-27 | 2021-08-20 | 四川神光石英科技有限公司 | Equipment for producing high-quality synthetic quartz glass |
| CN113277716B (en) * | 2021-05-27 | 2022-06-03 | 四川神光石英科技有限公司 | Equipment for producing high-quality synthetic quartz glass |
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