CN105271700A - Control device for environment airflow in VAD reaction cavity and application thereof - Google Patents
Control device for environment airflow in VAD reaction cavity and application thereof Download PDFInfo
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- CN105271700A CN105271700A CN201510785082.XA CN201510785082A CN105271700A CN 105271700 A CN105271700 A CN 105271700A CN 201510785082 A CN201510785082 A CN 201510785082A CN 105271700 A CN105271700 A CN 105271700A
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Abstract
The invention provides a control device for environment airflow in a VAD reaction cavity. The control device comprises a deposition cavity, a wrapping lamp, a core lamp, a leading bar extending into the deposition cavity, a partition plate located in the disposition cavity and provided with a passing hole, an upper air extraction opening connected with an air extraction system of an external wrapping layer disposition cavity, a lower air extraction opening connected with an air extraction system of an external core layer disposition cavity, and a target rod located in the deposition cavity and passing through the passing hole in the partition plate. The target rod ascends, descends and rotates through the leading bar. The partition plate partitions the deposition cavity into the wrapping layer disposition cavity in the upper portion and the core layer disposition cavity in the lower portion. The wrapping lamp and the upper air extraction opening are arranged corresponding to the target rod part located in the wrapping layer disposition cavity, and the core lamp and the lower air extraction opening are arranged corresponding to the target rod part located in the core layer disposition cavity. According to the control device, mutual interference between core layer flames and wrapping layer flames can be reduced or even isolated, core layer and wrapping layer independent deposition is achieved, and the deposition environment airflow is controlled more effectively due to independent air extraction of the core layer deposition cavity and the wrapping layer deposition cavity.
Description
Technical field
The invention belongs to preform research and development and manufacturing technology field, especially relate to a kind of control device and application thereof of VAD reaction cavity environment air-flow.
Background technology
VAD (vapor axial deposition) technique is one of a kind of important method preparing preform, and its principal feature is the axial growth of preform.Molecule (SiO is oxidized to by hydrolysis reaction from the halide feedstock of blowtorch ejection
2or GeO
2), sandwich layer and covering particulate are deposited on one end of the silica glass target rod of rotation simultaneously vertically, and are finally deposited as the loosening body (soot) of a cylindrical shape.This loosening body is online or dewater and be sintered to transparent glass stick separately subsequently.
Current, VAD is mainly for the preparation of the plug soot of prefabricated rods.In the process of deposition, general employing is a covering blowtorch and a sandwich layer blowtorch, by carrying out adjustment to a certain degree to the position of the distance between two blowtorch, the elevation angle and extractor fan, bag lights flame is made to become a metastable general layout with core lights flame, by chemical vapour deposition by GeO
2and SiO
2particle is deposited into target rod simultaneously, forms the loosening body of a cylindrical shape gradually.In whole process, very high requirement is had, once a certain processing parameter occurs that namely deviation can produce considerable influence to the stable refractive index of the plug after the size of sedimentation rate, collection effciency and whole soot and sintering to the position of blowtorch, the fitness of extractor fan.With regard to VAD technique, sedimentation rate directly determines production efficiency; Collection effciency directly determines the cost of product; The stable refractive index of soot size and plug directly determines the qualification rate of product.
Current VAD depositing system comes with some shortcomings part.Such as: in the process that whole VAD deposits, what primarily do is the shape ensureing soot, if soot bottom can not maintain desirable shape during deposition, the refractive index profile of the plug after the soot sintering generally deposited can not meet the demands.And the lower shape of soot controls very relevant with general layout with the shape of core lights flame and bag lights flame, not only to consider the layout between two blowtorch and target rod, also need to consider influencing each other between core lamp and blowtorch, make its position be in one and compare the state suited.Therefore calibrating whole system, particularly blowtorch position is a technique activity very complicated and consuming time.If core bag deposition can be realized to be separated, make between core lights flame and bag lights flame, no longer to introduce air-flow, raw material and flame and mix some the unmanageable factors brought, so, only need to consider separately for the calibration between target rod when the adjustment of the position of core lamp and bag lamp, thus make each adjustment become very easy.And in deposition process, core lamp and bag lamp will complete the deposition of sandwich layer and covering independently of one another, make the plasticity-of soot shape stronger, more easily reach perfect condition.
Secondly, in deposition process, the stability of soot size is very important, and the instability of size will directly affect the quality of plug, such as on the impact of plug D/d parameter after sintering (the diameter ratio of covering and sandwich layer), this impact also will produce chain unfavorable factor to subsequent handling.If follow-up employing RIC technique, then can improve the cost of sleeve pipe; If adopt OVD to do outsourcing, then unfavorable factor can be caused to OVD depositing operation stability.For existing VAD system, in deposition process, influence each other owing to existing between two blowtorch, make bag lights flame can have influence on size, the density of sandwich layer deposition, and when sandwich layer deposition is affected, the deposition of covering can be affected conversely.If the deposition of sandwich layer is realized in an independent cavity by core lamp completely, so the size of sandwich layer will become better control, more stable, thus covering deposition also can become relatively stable, and finally realizes more stable soot size control.
Moreover sedimentation rate directly determines the production efficiency of VAD technique.In VAD technique, sedimentation rate is directly decided by core lamp, but can be subject to the impact of bag lamp simultaneously.Existing depositing system, because sandwich layer and covering are in a cavity, in deposition process, under same raw and auxiliary material supply prerequisite, needs to improve sedimentation rate, is subject to the restriction with bag lamp position, bag lights flame so to a great extent.
Also have, exhausting system also can not be ignored the impact in whole deposition process, the size of suction pressure, to the size of prefabricated rods, sedimentation effect, collection rate has larger impact, and in traditional VAD cavity, suction opening is the flue dust simultaneously extracting core lamp and the generation of bag lamp, and to having an impact to both flames simultaneously, and in fact the flame flow of bag lamp will much larger than core lamp, therefore, in order to meet the exhausting demand of covering deposition, overall exhausting is relatively made to remain on a stronger position, this can affect greatly the shape of core lights flame and stability to a certain extent, thus limit speed and the efficiency of sandwich layer deposition.
In addition, VAD is in the process of carrying out plug deposition, and the whether stable index distribution directly having influence on the rear plug of sintering of sandwich layer deposition, this is primarily of GeO in sandwich layer deposition process
2deposition effect determine therefore how to avoid bag lamp flame flow to the impact of core lamp, and offset the SiO produced in bag lights flame at the same time
2particulate mixes the impact of Ge concentration to sandwich layer, and can to make plug refractive index profile stablize, and to be easier to design be very important.
Known in sum, in the deposition process of whole VAD prefabricated rod mandrel soot, due to the special construction of plug, the airshed of general covering blowtorch will much larger than the airshed of sandwich layer blowtorch, and the laminar air flow of reaction cavity inner cladding region is also larger, covering blowtorch also can be higher to the requirement of exhausting simultaneously.These all can produce disturbance to the less sandwich layer flame of flow, thus affect the sedimentation rate of sandwich layer, sedimentation effect and index distribution, and then affect stable production.
Summary of the invention
In view of this, the present invention is intended to the control device and the application thereof that propose a kind of VAD reaction cavity environment air-flow, the mutual interference even isolated between sandwich layer and covering flame can be reduced, simultaneously by controlling the independence of exhausting, more accurate sandwich layer and covering depositional control are provided further, realize sandwich layer and covering independent deposition, the independence of sandwich layer deposit cavity and covering deposit cavity exhausting separately also makes sedimentary environment air-flow obtain more effective control, improve sandwich layer sedimentation rate and stability, and during adjustment to sedimentation effect in covering deposition process, decrease the impact on sandwich layer, index distribution will become and more easily control.
For achieving the above object, technical scheme of the present invention is achieved in that
A control device for VAD reaction cavity environment air-flow, comprises deposition chamber, bag lamp, core lamp, to stretch into drawing in bar and deposition chamber of deposition chamber excellent with the target passing dividing plate via hole in the dividing plate of via hole and the upper suction opening is connected with extramural cladding deposit cavity exhausting system and the lower suction opening is connected with outside sandwich layer deposit cavity exhausting system and deposition chamber; Described target rod is fixed on and draws on bar, realizes lifting by drawing bar and rotates; Deposition chamber is separated into the covering deposit cavity on top and the sandwich layer deposit cavity of bottom by described dividing plate; The target rod part that described bag lamp and described upper suction opening correspondence are in described covering deposit cavity is arranged; The target rod part that described core lamp and described lower suction opening correspondence are in described sandwich layer deposit cavity is arranged.
Further, described via hole is circular hole.
Further, described dividing plate is titanium plate.
Further, the both sides being arranged on described deposition chamber that described upper suction opening is relative with described bag lamp.
Further, the both sides being arranged on described deposition chamber that described lower suction opening is relative with described core lamp.
The control device applying above-mentioned VAD reaction cavity environment air-flow carries out the method for vapor axial deposition to target rod, comprise the steps:
1., when ensureing deposition chamber sealing, first preheating is carried out to target rod with core lamp and bag lamp;
2. respectively technique adjustment is carried out to core lamp and bag lamp;
3. control the covering deposit cavity exhausting system be connected with upper suction opening and the sandwich layer deposit cavity exhausting system be connected with lower suction opening respectively, make the air-flow in sandwich layer deposit cavity and covering deposit cavity all reach steady state;
4. control to draw bar and make rotation, rising, the part that target rod sandwich layer has been deposited enters covering deposit cavity and carries out covering deposition.
Further, step 2. in adjustment to core lamp angle and coordinate position is comprised to the technique adjustment of core lamp.
Further, step 2. in adjustment to bag lamp angle, coordinate position and gas flow is comprised to the technique adjustment of bag lamp.
Relative to prior art, the present invention has following advantage:
1) by the separation of core lamp, bag lamp, improve the adjustability of total system, controllability, reduce influencing each other between bag lamp and core lamp, make the deposition process parameters such as loosening body size, sedimentation rate, sedimentation effect more stablize controlled, and be that follow-up lifting development provides larger space.
2) core lamp, bag lamp are separated and arrange, and reduce the impact of bag lamp on core lamp, make the refractive index profile of plug more stable, refractive index profile is designed and is also more prone to comparatively before.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is structural representation of the present invention.
Description of reference numerals:
1-deposition chamber, 2-draws bar, 3-target rod, 4-loosening body covering, 5-loosening body sandwich layer, 6-dividing plate, 7-core lamp, 8-bag lamp, the upper suction opening of 9-, suction opening under 10-, 11-covering deposit cavity, 12-sandwich layer deposit cavity, 13-via hole.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
A control device for VAD reaction cavity environment air-flow, comprises deposition chamber 1, bag lamp 8, core lamp 7, stretches into the target rod 3 drawn with the dividing plate 6 of via hole 13 and the upper suction opening 9 is connected with extramural cladding deposit cavity exhausting system and the lower suction opening 10 is connected with outside sandwich layer deposit cavity exhausting system and the interior via hole 13 passed on dividing plate 6 of deposition chamber 1 in bar 2 and deposition chamber 1 of deposition chamber 1; Described target rod 3 is fixed on and draws on bar 2, realizes lifting by drawing bar 2 and rotates; Deposition chamber 1 is separated into the covering deposit cavity 11 on top and the sandwich layer deposit cavity 12 of bottom by described dividing plate 6; The target rod part that described bag lamp 8 and described upper suction opening 9 correspondence are in described covering deposit cavity 11 is arranged; The target rod part that described core lamp 7 and described lower suction opening 12 correspondence are in described sandwich layer deposit cavity 12 is arranged.
The present invention carries out the isolation of non-fully formula by the covering deposition region in dividing plate 6 pairs of deposition chamber and sandwich layer deposition region, the negative pressure of upper suction opening 11 and lower suction opening 12 can independently carry out regulating and detecting, considerably reduce the mutual interference between deposition process center core layer and covering flame, the independence of respective exhausting also makes sedimentary environment air-flow obtain more effective control, to the stability of sandwich layer sedimentation rate, and during adjustment on sedimentation effect in covering deposition process, also can reduce the impact on sandwich layer; Index distribution will become and more easily control.
In deposition process, exhausting system can directly cause chamber environment air-flow to change on the impact of lights flame, and the flame flow of bag lamp exceedes core lamp greatly usually, utilized same exhausting system to control, be the dual optimized object of deposition effect being difficult to reach sandwich layer and covering in the past.In the present invention, covering deposition and sandwich layer deposition all gather around separately independently exhaust control system, the autumn can be needed to carry out independent adjustment for sandwich layer and covering deposition separately, and greatly reduce interference each other.The stability of flame profile can be increased by the exhausting pressure reducing sandwich layer deposit cavity exhausting system.And the Independent adjustable of covering deposit cavity exhausting system can avoided, under the impact on sandwich layer deposition, realizing higher sedimentation effect.
Wherein, described via hole 13 is circular hole, and like this, the partial shape rule that covering deposit cavity 11 communicates with sandwich layer deposit cavity 12, around target rod, even if there is slight air-flow process, does not also affect deposition, ensures deposition chamber 1 environment steady air current.The size of via hole 13 should meet deposited by sandwich layer after with in target rod 3 situations of loosening body sandwich layer 5, as far as possible little.
Above-mentioned deposition chamber 1 cross section circular, for air flowing principle features, reduces minimum by the impact of air-flow, ensures deposition chamber 1 environment steady air current.
Described dividing plate 6 is titanium plate.It is pointed out that dividing plate 6 best level is arranged, ensure that the air-flow in covering deposit cavity and sandwich layer deposit cavity is steady.Thickness≤the 1mm of dividing plate 6, like this, reaching isolation covering deposit cavity 11 with under the prerequisite of air-flow in sandwich layer deposit cavity 12, also do not hinder heat to transmit between the two, warm field linking overall in deposition chamber 1 still can maintain a relatively stable state.
The both sides of described deposition chamber 1 that what described upper suction opening 9 was relative with described bag lamp 8 be arranged on.The both sides of described deposition chamber 1 that what described lower suction opening 10 was relative with described core lamp 7 be arranged on.Like this, suction opening, at the least significant end of wind direction, can reach the effect of better steady air flow.
Sandwich layer deposition is deposited independent with covering, impact between the two when reducing deposition, when calbiration system, only need adjust the collimation of two blowtorch separately and between target excellent 3, and without the need to consider flame between two blowtorch mutually intersect bring raw material, air-flow impact.When depositing, once run into soot shape anomaly, can operate control separately to core lamp 7 or bag lamp 8, and on the impact of another lamp flame distribution, can not realize more stable sedimentation state and control, simple to operate, convenient, efficiency is high.
Wherein, drawing bar 2 can by electric cylinder rotating band moving-target rod 3 lifting, and can realize accurately controlling, level of automation is high.
The control device applying above-mentioned VAD reaction cavity environment air-flow carries out the method for vapor axial deposition to target rod, comprise the steps:
1., when ensureing that deposition chamber 1 seals, first preheating is carried out to target rod 3 with core lamp 7 and bag lamp 8;
2. respectively technique adjustment is carried out to core lamp 7 and bag lamp 8;
3. control the covering deposit cavity exhausting system be connected with upper suction opening 9 and the sandwich layer deposit cavity exhausting system be connected with lower suction opening 10 respectively, make the air-flow in sandwich layer deposit cavity 12 and covering deposit cavity 11 all reach steady state;
4. control to draw bar 2 and make rotation, rising, the part that target rod 3 sandwich layers have been deposited enters covering deposit cavity 11 and carries out covering deposition.Loosening body through via hole 13, then carries out deposition covering and forms loosening body covering 4, until finally reach required soot length after sandwich layer blowtorch deposition.
Adopt this device to carry out vapor axial deposition, achieve core bag stepped depositions, when the size control to soot, also progressively can pass through the distribution adjustment to sandwich layer and covering, accomplish more accurate, stable control.Because the independence of sandwich layer deposition and exhausting controls, be not subject to impact and the restriction of covering flame and covering exhausting demand.
In process of production, when needs adjustment sedimentation rate, only need adjust sandwich layer flame, air-flow etc., the raising of sedimentation rate and production efficiency be become and is more prone to controlled.Meanwhile, in order to ensure the size qualification of product, after reaching required sedimentation rate, more corresponding adjustment is made to covering deposition can realize required deposition effect separately.
The independence that sandwich layer deposition and covering deposit is controlled, has independently exhausting system simultaneously, is more of value to the stability of Ge dopant profiles when sandwich layer deposits, obtains better precast rod refractivity section.
Step 2. in adjustment to core lamp 7 angle and coordinate position is comprised to the technique adjustment of core lamp 7.Adjustment to bag lamp 8 angle, coordinate position and gas flow is comprised to the technique adjustment of bag lamp 8.
In deposition process, if the shape running into sandwich layer goes wrong, such as bottom is partially flat, then can independently by regulate core lamp 7 angle and coordinate position up and down and front and back complete technique adjustment, and without the need to the impact of the factors such as the flame envelope that is subject to covering.
For covering, when the deposited stabilizer of sandwich layer, sedimentation rate remain on certain numerical value, so for wanting the prefabricated rods manufacturing predetermined size, only need starting material and the gas flow of considering covering.
The present invention adopts deposition process center core layer and covering cavity to be separated by dividing plate, adopt independent environmental gas system layer stream and tail gas gathering system, realize the independent deposition system that core bag separates, both the mutual interference reduced between the two improves stability, more effectively can analyze again and control whole deposition process in real time.During prefabricated rods due to design different refractivity section, mainly to the control of sandwich layer deposition, and use the present invention to carry out vapor axial deposition, independently sandwich layer deposition has cast aside the impact of covering flame and whole cavity exhausting, make more easily to control when carrying out core refractive rate Section Design, therefore, in deposition process, there is larger room for promotion to the stability of the shape, size, sedimentation rate, collection effciency, index distribution etc. of prefabricated rods soot and controllability.While enhancing product performance, production cost can be reduced again, and be convenient to develop new product.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a control device for VAD reaction cavity environment air-flow, is characterized in that: comprise deposition chamber, bag lamp, core lamp, to stretch into drawing in bar and deposition chamber of deposition chamber excellent with the target passing dividing plate via hole in the dividing plate of via hole and the upper suction opening is connected with extramural cladding deposit cavity exhausting system and the lower suction opening is connected with outside sandwich layer deposit cavity exhausting system and deposition chamber; Described target rod is fixed on and draws on bar, realizes lifting by drawing bar and rotates; Deposition chamber is separated into the covering deposit cavity on top and the sandwich layer deposit cavity of bottom by described dividing plate; The target rod part that described bag lamp and described upper suction opening correspondence are in described covering deposit cavity is arranged; The target rod part that described core lamp and described lower suction opening correspondence are in described sandwich layer deposit cavity is arranged.
2. the control device of a kind of VAD reaction cavity environment air-flow according to claim 1, is characterized in that: described via hole is circular hole.
3. the control device of a kind of VAD reaction cavity environment air-flow according to claim 1, is characterized in that: described dividing plate is titanium plate.
4. the control device of a kind of VAD reaction cavity environment air-flow according to claim 1, is characterized in that: the both sides being arranged on described deposition chamber that described upper suction opening is relative with described bag lamp.
5. the control device of a kind of VAD reaction cavity environment air-flow according to claim 1, is characterized in that: the both sides being arranged on described deposition chamber that described lower suction opening is relative with described core lamp.
6. application rights requires that the control device of the VAD reaction cavity environment air-flow described in 1 carries out the method for vapor axial deposition to target rod, it is characterized in that, comprises the steps:
1., when ensureing deposition chamber sealing, first preheating is carried out to target rod with core lamp and bag lamp;
2. respectively technique adjustment is carried out to core lamp and bag lamp;
3. control the covering deposit cavity exhausting system be connected with upper suction opening and the sandwich layer deposit cavity exhausting system be connected with lower suction opening respectively, make the air-flow in sandwich layer deposit cavity and covering deposit cavity all reach steady state;
4. control to draw bar and make rotation, rising, the part that target rod sandwich layer has been deposited enters covering deposit cavity and carries out covering deposition.
7. the control device of application VAD reaction cavity environment air-flow according to claim 6 carries out the method for vapor axial deposition to target rod, it is characterized in that: step 2. in adjustment to core lamp angle and coordinate position is comprised to the technique adjustment of core lamp.
8. the control device of application VAD reaction cavity environment air-flow according to claim 6 carries out the method for vapor axial deposition to target rod, it is characterized in that: step 2. in adjustment to bag lamp angle, coordinate position and gas flow is comprised to the technique adjustment of bag lamp.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107986612A (en) * | 2017-12-19 | 2018-05-04 | 长飞光纤光缆股份有限公司 | A kind of VAD prepares the device of fibre parent material |
| CN109516686A (en) * | 2018-12-21 | 2019-03-26 | 江苏通鼎光棒有限公司 | A kind of the preform female rod stretching device and drawing process of VAD sintering |
| CN113480161A (en) * | 2021-08-20 | 2021-10-08 | 武汉智纤科技有限公司 | Device for improving stability of VAD (vapor deposition) prepared optical fiber preform |
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