CN202063828U - Loosening body precasting bar sintering device - Google Patents
Loosening body precasting bar sintering device Download PDFInfo
- Publication number
- CN202063828U CN202063828U CN 201120152826 CN201120152826U CN202063828U CN 202063828 U CN202063828 U CN 202063828U CN 201120152826 CN201120152826 CN 201120152826 CN 201120152826 U CN201120152826 U CN 201120152826U CN 202063828 U CN202063828 U CN 202063828U
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- CN
- China
- Prior art keywords
- loose body
- plug
- bar
- chlorine
- standard value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Thermal 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 utility model discloses a loosening body precasting bar sintering device which comprises a heating device, a glass furnace core pipe, a core bar loosening body, a drawing bar, a servo motor, an air inlet and an exhaust port, wherein the heating device is used for warming the glass furnace core pipe; a loosening body precasting bar is suspended in the glass furnace core pipe, and drying gas passes through the glass furnace core pipe; the core bar loosening body is arranged in the glass furnace core pipe; the core bar loosening body is connected with the servo motor through the drawing bar; the servo motor is used for controlling the sintering speed; the air inlet is used as an inlet of the drying gas; and the exhaust port is used as an outlet of the drying gas. According to the glass core bar precasting body manufactured in the utility model, after the glass core bar precasting body is lengthened to have an objective diameter through a lengthening device, through the detection, the relative refractivity of a whole core bar, particularly the relative refractivity of two ends of the core bar is basically controlled within a qualified parameter range, compared with the prior art, the relative refractivity distributing uniformity and the yield of the core bar are improved, and the cost is saved.
Description
Technical field
The utility model relates to a kind of manufacturing field of single-mode fiber, relate to more precisely a kind of by change sintering process control the plug refractive index contrast (
, n wherein
1Be sandwich layer specific refractory power, n
2Be cladding index) improve the method for prefabricated plug homogeneity.
Background technology
At fiber optic communication field, optical fiber is to be mother metal with the preform, and wire drawing is in proportion made, so optical fiber properties depends on the preparation quality of preform to a great extent.Ideal single-mode fiber index distribution state is that phase step type distributes, specific refractory power is suddenlyd change from the sandwich layer to the covering, but in the optical fiber that reality is made, particularly when adopting the VAD(VAD) when method is made preform, deposition corresponding to plug is to produce in an independent operation, the chemical reaction that mainly takes place when the deposition plug loosens body:
Owing to adopt the VAD legal system to be equipped with mandrel process, it is on the low side just to have begun in the deposition process temperature, causes generating in the chemical reaction process GeO
2Content higher relatively, improved the specific refractory power at loose body top; In the loose body sintering process dehydration of plug link, the time of loose body afterbody contact sintering oven high-temperature zone is less relatively, GeO
2Content is also higher relatively, and the reason of above-mentioned two aspects causes the refractive index contrast at plug two ends to be higher than the refractive index contrast (seeing accompanying drawing 3) of plug middle portion.
The main effect of logical chlorine has two kinds in the loose body dehydration of plug link: the one, remove the moisture content of a certain amount of physical adsorption and chemisorption in the loose body, and the 2nd and some metallic impurity reactions, generate metal halide and evaporate.And when high temperature, also be accompanied by a side reaction:
Therefore by increasing the amount of chlorine, cause pyroreaction to be carried out to the right, generate GeCl
4Gas and overflow plug center core layer GeO
2Content reduces, and refractive index contrast also lowers.
In view of the foregoing, the purpose of this utility model provides a kind of loose body prefabricated rods agglomerating plant, with this device flow by control chlorine when the loose body of plug is carried out sintering, particularly control feeds the flow of loose body two ends chlorine, regulate the refractive index contrast of whole plug, make the refractive index contrast of whole plug be distributed in a level, thereby guarantee the homogeneity of the optical fiber parameter that this optical fiber prefabricated rod mandrel of use draws out, also can reduce simultaneously the condemnation factor of plug, improve qualification rate and utilization ratio, thereby save cost.
Summary of the invention
The purpose of this utility model provides a kind of loose body prefabricated rods agglomerating plant, distributes by the refractive index contrast of adjusting prefabricated plug, improves the preform utilization ratio, saves cost.
The technical scheme that the prior art problem that solves the utility model adopts is: heating unit is used for the glass furnace core tube is heated the control sintering temperature; The glass furnace core tube hangs loose body prefabricated rods within it and passes through dry gas within it; The plug body that loosens, it is placed in the glass furnace core tube; Draw bar, the loose body of plug links to each other with servomotor by drawing bar; Servomotor is used to control sintering velocity; Inlet mouth is as the inlet of dry gas; Venting port is as the outlet of dry gas.
Agglomerating plant of the present utility model further comprises the high precision mass flow controller, and it links to each other with inlet mouth, is used for regulating the flow of chlorine.Enter into inlet mouth by the chlorine that divides many time periods to supply different flow, regulate the refractive index contrast of whole plug.
The utility model advantage:
Preform according to the manufacturing of the utility model device, distribute by regulating the plug refractive index contrast, guarantee the homogeneity of the optical fiber parameter that this optical fiber prefabricated rod mandrel of use draws out, also can reduce the condemnation factor of plug simultaneously, improve qualification rate and utilization ratio, thereby save cost.
Description of drawings
Fig. 1 is the agglomerating plant synoptic diagram of the loose body prefabricated rods of the utility model.
Fig. 2 is the utility model chlorine flowrate control synoptic diagram.
Fig. 3 is a plug refractive index contrast distribution plan before the utility model process modification.
Fig. 4 is plug A, B after the utility model process modification, C refractive index contrast distribution plan.
Fig. 5 is plug D, E after the utility model process modification, F refractive index contrast distribution plan.
Number in the figure explanation: 1, heating unit; 2, glass furnace core tube; 3, the loose body of plug; 4, draw bar; 5, servomotor; 6, inlet mouth; 7, venting port; 8, high precision mass flow controller (MFC); 9, improve preceding plug 1; 10, improve preceding plug 2; 11, improve preceding plug 3; 12, improve back plug A; 13, improve back plug B; 14, improve back plug C; 15, improve back plug D; 16, improve back plug E; 17, improve back plug F.
Embodiment
Below in conjunction with Figure of description the utility model is specifically described.
According to shown in Figure 1, the agglomerating plant of loose body prefabricated rods comprises: heating unit is used for the glass furnace core tube is heated the control sintering temperature; The glass furnace core tube hangs loose body prefabricated rods within it and passes through dry gas within it; The plug body that loosens, it is placed in the glass furnace core tube; Draw bar, the loose body of plug links to each other with servomotor by drawing bar; Servomotor is used to control sintering velocity; Inlet mouth is as the inlet of dry gas; Venting port, as the outlet of dry gas, high precision mass flow controller (MFC) links to each other with inlet mouth and regulates the flow of chlorine.
Sintering is in the glass furnace core tube of a sealing, and by to sintering temperature, sintering velocity, gas flow are controlled and finished, and specifically are divided into dehydration and two processes of vitrifying.Adopt the loose body of conventional VAD method deposition plug, the loose body of plug is finished dehydration, vitrifying process in sintering oven.The utility model is intended to feed chlorine in the loose body dehydration of plug, regulates the flow of chlorine by high precision mass flow controller (MFC), and then regulates the refractive index contrast of plug behind the sintering.Specific implementation process be standard value of flow regulation of chlorine be 0.6-1.4 lpm(liter/minute), divide a plurality of time periods supply chlorine, the flow control of chlorine is at the 110%-120% with respect to standard value.The flow control of helium 10-40 lpm(liter/minute), approximately dewatered 2-5 h(hour).Accompanying drawing 2 is seen in chlorine flowrate control, a high-temperature heating equipment 1 is housed in the sintering oven, have only when loose body enters into this high-temperature area, just can finish dehydration, transverse axis is represented the position coordinates of loose body among Fig. 2, and for example in loose preceding 20 millimeters time periods that enter high-temperature area of body, control high precision mass flow controller (MFC) is regulated the flow of chlorine, by that analogy, the realization time segment is controlled chlorine flowrate.Be warmed up to 1400-1600 ℃ then, carry out vitrifying, allow loose SiO
2Particle is fusion at high temperature, gets rid of internal gas, and loose like this body has just become transparent prefabricated glass plug, after the process extension device extends to aimed dia again, by detecting, draws the refractive index contrast distribution plan.Whole process control sintering velocity (servomotor lowering speed) is a 1-5 mmpm(mm/min).Glass plug prefabricated rods according to the utility model manufacturing, after the process extension device extends to aimed dia, detect, find the refractive index contrast of whole plug, especially the refractive index contrast basic controlling at plug two ends is compared in qualified parameter area than before, improves the homogeneity that the plug refractive index contrast distributes, qualification rate is saved cost.
Embodiment 1:
Get 3 and deposit the good A that is numbered, B, the loose body prefabricated rods of C, hang on respectively in 3 glass furnace core tube sintering ovens with 4-10 rpm(revolutions per minute) the speed rotation, control sintering velocity (servomotor lowering speed) is a 1-5 mmpm(mm/min), furnace temperature is raised to 1100-1300 ℃, allow dry gas such as chlorine and helium slowly loose body prefabricated rods be dewatered from the bottom to top by furnace core tube, standard value of the flow of chlorine regulation be 0.6-1.4 lpm(liter/minute), divide 3 time period supplies, chlorine flowrate is respectively: the 60-120mm(millimeter of loose body tail end) be with respect to 120% of standard value; Loose body middle part is a standard value; The 60-120mm(millimeter of loose body head end) be with respect to 120% of standard value.The flow control of helium 10-40 lpm(liter/minute), approximately dewatered 2-5h(hour).Be warmed up to 1400-1600 ℃ then, carry out vitrifying, allow loose SiO
2Particle is fusion at high temperature, gets rid of internal gas, and loose like this body has just become transparent prefabricated glass plug, after the process extension device extends to the target plug again, by detecting, draws the refractive index contrast distribution plan.See accompanying drawing 4.
Embodiment 2:
Get 3 and deposit the good D that is numbered, E, the loose body prefabricated rods of F, hang on respectively in 3 glass furnace core tube sintering ovens with 4-10 rpm(revolutions per minute) the speed rotation, control sintering velocity (servomotor lowering speed) is 1-5mmpm, furnace temperature is raised to 1100-1300 ℃, allow dry gas such as chlorine and helium slowly loose body prefabricated rods be dewatered from the bottom to top by furnace core tube, standard value of the flow of chlorine regulation be 0.6-1.4 lpm(liter/minute), divide 7 time period supplies, chlorine flowrate is respectively: the 60-120 mm(millimeter of loose body tail end) be with respect to 120% of standard value, 115%, 110%; Loose body middle part is a standard value; The 60-120 mm(millimeter of loose body head end) be with respect to 110%, 115%, 120% of standard value.The flow control of helium 10-40 lpm(liter/minute), approximately dewatered 2-5 h(hour).Be warmed up to 1400-1600 ℃ then, carry out vitrifying, allow loose SiO
2Particle is fusion at high temperature, gets rid of internal gas, and loose like this body has just become transparent prefabricated glass plug, after the process extension device extends to the target plug again, by detecting, draws the refractive index contrast distribution plan.See accompanying drawing 5.
By the experiment of the logical chlorine of above segmentation, find to regulate the division step of loose logical chlorine of body prefabricated rods dehydration period, the refractive index contrast that can regulate whole plug distributes and is in a level substantially, and the step of dividing is many more, is tending towards smooth more.Therefore, by revising the chlorine flowrate sequence of control, between the 110%-130% of standard value, smooth curve of match, can make whole plug homogeneity be improved significantly.
Claims (7)
1. loose body prefabricated rods agglomerating plant is characterized in that comprising with lower member:
Heating unit is used for the glass furnace core tube is heated, the control sintering temperature; The glass furnace core tube hangs loose body prefabricated rods within it and passes through dry gas within it; The plug body that loosens, it is placed in the glass furnace core tube; Draw bar, the loose body of plug links to each other with servomotor by drawing bar; Servomotor is used to control sintering velocity; Inlet mouth is as the inlet of dry gas; Venting port is as the outlet of dry gas.
2. device according to claim 1 is characterized in that:
Dry gas comprises chlorine and helium.
3. device according to claim 2 is characterized in that:
The high precision mass flow controller links to each other with inlet mouth, is used for regulating the flow of chlorine.
4. device according to claim 3 is characterized in that:
Enter into inlet mouth by the chlorine that divides many time periods to supply different flow, regulate the refractive index contrast of whole plug.
5. device according to claim 4 is characterized in that:
Described a plurality of time period can be 3 time periods or 7 time periods.
6. device according to claim 5 is characterized in that:
When dividing 3 time periods to supply, chlorine flowrate is respectively: 60 ~ 120 millimeters of loose body tail end is with respect to 120% of standard value; Loose body middle part is a standard value; 60 ~ 120 millimeters of loose body head end is with respect to 120% of standard value.
7. device according to claim 5 is characterized in that:
When dividing 7 time periods to supply, chlorine flowrate is respectively: 60 ~ 120 millimeters of loose body tail end is with respect to 120%, 115%, 110% of standard value; Loose body middle part is a standard value; 60 ~ 120 millimeters of loose body head end is with respect to 110%, 115%, 120% of standard value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120152826 CN202063828U (en) | 2011-05-13 | 2011-05-13 | Loosening body precasting bar sintering device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120152826 CN202063828U (en) | 2011-05-13 | 2011-05-13 | Loosening body precasting bar sintering device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202063828U true CN202063828U (en) | 2011-12-07 |
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ID=45057697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120152826 Expired - Fee Related CN202063828U (en) | 2011-05-13 | 2011-05-13 | Loosening body precasting bar sintering device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202063828U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730961A (en) * | 2012-07-16 | 2012-10-17 | 江苏亨通光电股份有限公司 | Device and method for preparing large-size bend insensitive fiber preform |
-
2011
- 2011-05-13 CN CN 201120152826 patent/CN202063828U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102730961A (en) * | 2012-07-16 | 2012-10-17 | 江苏亨通光电股份有限公司 | Device and method for preparing large-size bend insensitive fiber preform |
| CN102730961B (en) * | 2012-07-16 | 2015-01-14 | 江苏亨通光电股份有限公司 | Device and method for preparing large-size bend insensitive fiber preform |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111207 Termination date: 20130513 |