CN117401899A - Optical fiber preform sintering equipment and method - Google Patents
Optical fiber preform sintering equipment and method Download PDFInfo
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- CN117401899A CN117401899A CN202311593854.0A CN202311593854A CN117401899A CN 117401899 A CN117401899 A CN 117401899A CN 202311593854 A CN202311593854 A CN 202311593854A CN 117401899 A CN117401899 A CN 117401899A
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- loose body
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- 238000005245 sintering Methods 0.000 title claims abstract description 35
- 239000013307 optical fiber Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000006698 induction Effects 0.000 claims abstract description 244
- 238000004017 vitrification Methods 0.000 claims abstract description 33
- 230000018044 dehydration Effects 0.000 claims abstract description 11
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 11
- 239000012495 reaction gas Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- YXTPWUNVHCYOSP-UHFFFAOYSA-N bis($l^{2}-silanylidene)molybdenum Chemical compound [Si]=[Mo]=[Si] YXTPWUNVHCYOSP-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910021343 molybdenum disilicide Inorganic materials 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
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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]
- C03B37/018—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] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
- C03B37/01853—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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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 invention discloses optical fiber preform sintering equipment, which comprises an induction furnace, a preform hanging rod rotating machine and an induction coil, wherein the induction furnace is provided with a rotary shaft; the preform rod hanging rod rotating machine is arranged in the induction furnace and is used for rotating the loose body preform rod; the induction coils are sequentially wound on the induction furnace from bottom to top; the induction coil is connected with a power supply; the induction furnace is integrally heated by the induction coil, so that the loose body preform is dehydrated; the induction furnace is heated layer by layer through the induction coil, so that the loose body preform is heated from bottom to top, and vitrification of the loose body preform is completed; the lower end of the induction furnace is provided with an air inlet which is communicated with the reaction gas supply device. The invention also provides a sintering method of the optical fiber preform. The invention can carry out dehydration and vitrification without passing the preform rod through a high temperature area, thereby reducing the volume of equipment.
Description
Technical Field
The invention relates to the field of optical fiber cable manufacturing, in particular to optical fiber preform sintering equipment and a method.
Background
Currently, in the field of optical fiber preform fabrication, plasma Chemical Vapor Deposition (PCVD) or vapor axial deposition (VA)D) As a core rod, a large-diameter preform is produced by externally adding a sleeve to the core rod, or a large-diameter optical fiber preform is produced by external vapor deposition (OVD) outside the core rod by using PCVD or VAD as the core rod. Either VAD or OVD, a loose preform is first manufactured. And secondly, placing the loose body preform in an environment of 1000-1200 ℃, and introducing dry gas (such as chlorine gas, he gas and Ar gas) to perform chemical reaction. The bulk preform dehydration chemistry is as follows: 2H (H) 2 O+2CL 2 ＝4HCL+O 2 ；
2Si-OH+2CL 2 ＝2Si-CL+2HCL+O 2 . And thirdly, vitrification is carried out on the loose body preform rod in a high-temperature environment with the temperature of 1500-1600 ℃ to obtain the optical fiber preform rod with hard texture and complete transparency.
The publication number is CN103771697A, the patent name is a sintering method and device of large-size optical fiber preform loose body, the defect of a common molybdenum disilicide heating wire is effectively overcome by embedding a graphite heater outside a clean quartz furnace core tube, sintering of a large-diameter preform can be realized, but the sintering device still slowly passes through a high-temperature field to realize dehydration and vitrification processes through the preform, and the whole sintering device is high in structure and occupies large workshop space.
In the patent with publication number CN103739194A, the sintering method of the optical fiber preform and equipment thereof, the temperature of a sintering furnace in the sintering process is adjusted by utilizing a laser feedback control system, the preform is required to pass through a high-temperature area for dehydration and vitrification, and the equipment occupies a large space.
Therefore, a new optical fiber preform sintering apparatus and method are urgently needed.
Disclosure of Invention
The main object of the present invention is to provide an optical fiber preform sintering apparatus and method which can perform dehydration and vitrification without passing the preform through a high temperature region, thereby reducing the volume of the apparatus.
The technical scheme adopted by the invention is as follows:
an optical fiber preform sintering device comprises an induction furnace, a preform hanging rod rotating machine and an induction coil;
the preform rod hanging rod rotating machine is arranged in the induction furnace and is used for rotating the loose body preform rod;
the induction coils are sequentially wound on the induction furnace from bottom to top; the induction coil is connected with a power supply; the induction furnace is integrally heated by the induction coil, so that the loose body preform is dehydrated; the induction furnace is heated layer by layer through the induction coil, so that the loose body preform is heated from bottom to top, and vitrification of the loose body preform is completed;
the lower end of the induction furnace is provided with an air inlet which is communicated with the reaction gas supply device.
In a further scheme, each induction coil corresponds to one power supply, and all the power supplies are controlled by a controller; the controller controls the power supply to further control the induction coils to increase or decrease power so as to accurately control the temperature in the induction furnace area corresponding to each induction coil.
Still further, the number of the induction coils is 4 so as to control the height of the induction furnace.
In a further aspect, the gas provided by the reactive gas supply device is: he. And reactive gases such as Cl2 and Ar.
In a further scheme, the rotating speed of the preform rod hanging rod rotating machine is 2-10r/min, so that dehydration and vitrification of the loose preform rod can be well realized.
In a further scheme, the central axis of the preform rod hanging rod rotating machine coincides with the central axis of the induction furnace so as to enable the loose preform rod to be dehydrated and vitrified more uniformly.
The invention also discloses an optical fiber preform sintering method, which adopts the optical fiber preform sintering equipment.
In a further aspect, the method includes the steps of:
1) Fixing the loose body preform on a preform hanging rod rotating machine, and starting the preform hanging rod rotating machine to enable the loose body preform to rotate;
2) Introducing reaction gas through a gas inlet;
3) The temperature in the induction furnace is integrally up to 1000-1200 ℃ through the induction coil for dehydration;
4) After the loose body preform is dehydrated, the loose body preform is heated from bottom to top through a plurality of induction coils layer by heating the induction furnace, and vitrification of the loose body preform is completed.
After vitrification of the loose body preform is completed, the temperature of the preform parts corresponding to all the induction coils is reduced to 1000-1200 ℃; all induction coils are kept at power for a certain time, the temperature in the induction furnace is kept at 1000-1200 ℃ as a whole, and the internal stress of the vitrified preform is eliminated.
In a further scheme, the temperature of the part of the prefabricated rod corresponding to all the induction coils is reduced to 1000-1200 ℃; all induction coils are kept at power for 10-20h, the temperature in the induction furnace is kept at 1000-1200 ℃ as a whole, and the internal stress of the vitrified preform is eliminated.
In the step 4), the step of heating the loose body preform from bottom to top by using a plurality of induction coils to heat the induction furnace layer by layer to complete vitrification of the loose body preform is as follows:
41 The induction coil at the lowest end of the induction furnace increases the power, so that the induction furnace area covered by the induction coil increases the temperature to 1500-1600 ℃, and the loose body preform corresponding to the induction coil is vitrified at the temperature;
42 After vitrification of the area corresponding to the induction coil at the lowest end of the induction furnace is completed, the power of the induction coil at the lowest end is reduced, so that the temperature of the vitrified preform part corresponding to the induction coil at the lowest end is reduced to 1000-1200 ℃ and maintained; while reducing the power of the induction coil at the lowest end, the induction coil at the second lower end nearest to the induction coil at the lowest end starts to boost the power, so that the induction furnace area covered by the induction coil at the second lower end is raised to 1500-1600 ℃, and the loose body preform corresponding to the induction coil at the second lower end is partially vitrified;
43 After vitrification of the loose body preform in the area corresponding to the induction coil at the second lower end is completed, the power of the coil at the second lower end is reduced, and the temperature of the preform part corresponding to the induction coil at the second lower end is reduced to 1000-1200 ℃ and maintained, so that the temperature of the induction coil at the lowest end and the area in the induction furnace corresponding to the induction coil at the second lower end is 1000-1200 ℃ and maintained; while reducing the power of the induction coil at the second lower end, starting to increase the power of the induction coil at the third lower end nearest to the induction coil at the second lower end, so that the induction furnace area covered by the induction coil at the third lower end is increased to 1500-1600 ℃, and the loose body preform part corresponding to the induction coil at the third lower end is vitrified;
44 In this way, the induction furnace is heated layer by layer to partially vitrify the loose preform in the heating region, and the power of the induction coil corresponding to the vitrified preform is reduced to maintain the temperature of the induction furnace region corresponding to the vitrified preform at 1000 ℃ to 1200 ℃;
45 After vitrification of the loose body preform in the area corresponding to the uppermost induction coil is completed, reducing power of the uppermost induction coil, reducing the temperature of the preform part corresponding to the uppermost induction coil to 1000-1200 ℃ and keeping, namely: the temperature of the induction furnace area corresponding to all the induction coils is kept at 1000-1200 ℃.
The induction coil is a high-precision induction coil, and the temperature fluctuation of the induction coil is less than 0.5 ℃.
The invention has the beneficial effects that:
the loose body preform rod does not pass through a high temperature area to realize dehydration and vitrification, and when dehydration is carried out, the whole body is subjected to induction heating to realize temperature control of 1000-1200 ℃; when vitrification sintering is carried out, the temperature of the loose body preform rod is gradually increased by heating layer by layer from bottom to top through a high-precision induction coil; the sintering equipment has the advantages of simple structure, small occupied space and cost reduction;
the used induction coil has high precision and can realize accurate temperature control;
when the loose body preform is sent to the induction furnace, the loose body preform only rotates and does not move up and down (does not need to move longitudinally), so that the complexity of a furnace body and a rod feeding mechanism is reduced, and the dehydration and vitrification processes of the loose body preform are very convenient;
the gradient heating of the loose body preform rod from bottom to top is realized by heating the loose body preform rod from bottom to top through the induction coil, and the electricity-saving effect is obvious;
by arranging the multi-stage induction coils, the temperature gradient can be accurately controlled, and the uniformity of the rod diameter is improved;
the induction coil can be made larger, can meet the sintering vitrification of a loose body preform with the diameter of 500mm, and has wide adaptability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an optical fiber preform sintering apparatus.
In the figure: 1. a preformed rod hanging rod rotating machine, 2, an induction furnace, 3, an air inlet, 4, a loose preformed rod, and 5, a first induction coil, 6, a second induction coil, 7, a third induction coil, 8 and a fourth induction coil.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, an optical fiber preform sintering apparatus includes an induction furnace 2, a preform rod-hanging rotary machine 1, and an induction coil group. The preform rod hanging rotary machine 1 is arranged in the induction furnace 2, the central axis of the preform rod hanging rotary machine 1 coincides with the central axis of the induction furnace 2, and the preform rod hanging rotary machine 1 is used for rotating the loose body preform rod 4. In order to achieve good dewatering and vitrification of the loose preform 4, the rotational speed of the preform rod-hanging rotary machine 1 can be controlled to 2-10r/min. The lower extreme of induction furnace 2 is equipped with air inlet 3, and this air inlet 3 communicates with the reaction gas air feeder, and the gas that reaction gas air feeder provided the induction furnace is: he. And reactive gases such as Cl2 and Ar.
The induction coil group comprises a first induction coil 5, a second induction coil 6, a third induction coil 7 and a fourth induction coil 8, wherein the first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8 are sequentially wound on the induction furnace from bottom to top; each induction coil corresponds to one power supply, and all the power supplies are controlled by a controller; the controller controls the power supply to further control the induction coils to increase or decrease power so as to accurately control the temperature in the induction furnace area corresponding to each induction coil. The induction furnace is integrally heated through the induction coil assembly, so that the loose body preform 4 is dehydrated; the induction furnace is heated layer by layer through the induction coil assembly, so that the loose body preform 4 is heated from bottom to top, and vitrification of the loose body preform 4 is completed.
The induction coils in this embodiment are all high-precision induction coils, and the temperature fluctuation is less than 0.5 °.
Example 2
An optical fiber preform sintering method using the optical fiber preform sintering apparatus of example 1; the method comprises the following steps:
1) The loose body prefabricated rod 4 enters the induction furnace 2, the loose body prefabricated rod 4 is fixed on the prefabricated rod hanging rod rotating machine 1, and the prefabricated rod hanging rod rotating machine 1 is started to enable the loose body prefabricated rod 4 to rotate;
2) Introducing reaction gases such as He, cl2, ar and the like through the gas inlet 3;
3) The first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8 start to work, and the whole temperature in the induction furnace 2 reaches 1000-1200 ℃ through the first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8 to dehydrate the loose preform 4;
the chemical reaction is as follows: 2H (H) 2 O+2CL 2 ＝4HCL+O 2 ；
2Si-OH+2CL 2 ＝2Si-CL+2HCL+O 2 ；
4) After the loose body preform 4 is dehydrated, the induction furnace 2 is heated layer by the first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8, so that the loose body preform is heated from bottom to top, and vitrification of the loose body preform 4 is completed; the method comprises the following steps:
41 The power of the first induction coil 5 is increased, so that the temperature of the area of the induction furnace 2 covered by the first induction coil 5 is increased to 1500-1600 ℃, and at the temperature, the loose body preform 4 corresponding to the first induction coil 5 is vitrified;
42 After the vitrification of the loose body preform 4 in the corresponding area of the first induction coil 5 is completed, the power of the first induction coil 5 is reduced, so that the temperature of the part of the preform which is vitrified and corresponds to the first induction coil 5 is reduced to 1000-1200 ℃ and maintained; the second induction coil 6 starts to boost power while reducing the power of the first induction coil 5, so that the temperature of the induction furnace 2 area covered by the second induction coil 6 is increased to 1500-1600 ℃, and the loose body preform 4 corresponding to the second induction coil 6 is partially vitrified;
43 After vitrification of the loose body preform 4 in the corresponding region of the second induction coil 6 is completed, the second induction coil 6 reduces power, and the temperature of the preform portion corresponding to the second induction coil 6 is reduced to 1000 ℃ to 1200 ℃ and maintained, so that the temperatures in the induction furnace 2 in the regions of the first induction coil 5 and the second induction coil 6 are 1000 ℃ to 1200 ℃ and maintained; the third induction coil 7 starts to boost power while reducing the power of the second induction coil 6, so that the temperature of the induction furnace 2 area covered by the third induction coil 7 is increased to 1500-1600 ℃, and the loose body preform 4 corresponding to the third induction coil 7 is partially vitrified;
44 After the vitrification of the loose body preform 4 in the corresponding area of the third induction coil 7 is completed, the third induction coil 7 reduces the power, the temperature of the part of the preform corresponding to the third induction coil 7 is reduced to 1000 ℃ to 1200 ℃ and kept, so that the temperatures of the induction furnace areas corresponding to the first induction coil 5, the second induction coil 6 and the third induction coil 7 are 1000 ℃ to 1200 ℃, and the fourth induction coil 8 starts to increase the power while reducing the power of the third induction coil 7, so that the temperature of the induction furnace 2 area covered by the fourth induction coil 8 is increased to 1500 ℃ to 1600 ℃, and the part of the loose body preform 4 corresponding to the fourth induction coil 8 is vitrified;
45 After vitrification of the loose body preform 4 in the corresponding region of the fourth induction coil 8 is completed, the fourth induction coil 8 is reduced in power, so that the temperature of the preform portion corresponding to the fourth induction coil 8 is reduced to 1000 ℃ to 1200 ℃ and maintained, namely: the temperature of induction furnace areas corresponding to all the first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8 is kept at 1000-1200 ℃;
5) After vitrification of the loose preform 4 is completed, the temperatures of the parts of the preform corresponding to the first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8 are reduced to 1000-1200 ℃; the first induction coil 5, the second induction coil 6, the third induction coil 7 and the fourth induction coil 8 are kept at power for 10-20h, the whole temperature in the induction furnace 2 is kept at 1000-1200 ℃, and the internal stress of the vitrified preform is eliminated at the temperature.
What is not described in detail in this specification is prior art known to those skilled in the art.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (10)
1. An optical fiber preform sintering apparatus, characterized in that: comprises an induction furnace, a preform rod hanging rotary machine and an induction coil;
the preform rod hanging rod rotating machine is arranged in the induction furnace and is used for rotating the loose body preform rod;
the induction coils are sequentially wound on the induction furnace from bottom to top; the induction coil is connected with a power supply; the induction furnace is integrally heated by the induction coil, so that the loose body preform is dehydrated; the induction furnace is heated layer by layer through the induction coil, so that the loose body preform is heated from bottom to top, and vitrification of the loose body preform is completed;
the lower end of the induction furnace is provided with an air inlet which is communicated with the reaction gas supply device.
2. The optical fiber preform sintering apparatus according to claim 1, wherein: each induction coil corresponds to one power supply, and all the power supplies are controlled by a controller; the controller controls the power supply to further control the induction coil to increase or decrease power.
3. The optical fiber preform sintering apparatus according to claim 1, wherein: there are 4 induction coils.
4. The optical fiber preform sintering apparatus according to claim 1, wherein: the reaction gas supply device supplies the following gases: he. Cl2 and Ar.
5. The optical fiber preform sintering apparatus according to claim 1, wherein: the rotating speed of the preform rod hanging rotary machine is 2-10r/min.
6. An optical fiber preform sintering method is characterized in that: the method employs the optical fiber preform sintering apparatus according to any one of claims 1 to 5.
7. The optical fiber preform sintering method according to claim 6, comprising the steps of:
1) Fixing the loose body preform on a preform hanging rod rotating machine, and starting the preform hanging rod rotating machine to enable the loose body preform to rotate;
2) Introducing reaction gas through a gas inlet;
3) The temperature in the induction furnace is integrally up to 1000-1200 ℃ through the induction coil for dehydration;
4) After the loose body preform is dehydrated, the loose body preform is heated from bottom to top through a plurality of induction coils layer by heating the induction furnace, and vitrification of the loose body preform is completed.
8. The optical fiber preform sintering method according to claim 7, wherein: after vitrification of the loose body preform is completed, the temperature of the preform parts corresponding to all the induction coils is reduced to 1000-1200 ℃; all induction coils are kept at power for a certain time, the temperature in the induction furnace is kept at 1000-1200 ℃ as a whole, and the internal stress of the vitrified preform is eliminated.
9. The optical fiber preform sintering method according to claim 8, wherein: the temperature of the part of the prefabricated rod corresponding to all the induction coils is reduced to 1000-1200 ℃; all induction coils are kept at power for 10-20h, the temperature in the induction furnace is kept at 1000-1200 ℃ as a whole, and the internal stress of the vitrified preform is eliminated.
10. The optical fiber preform sintering method according to claim 7, wherein:
in the step 4), the induction furnace is heated layer by layer through a plurality of induction coils, so that the loose body preform is heated from bottom to top, and the step of completing vitrification of the loose body preform is as follows:
41 The induction coil at the lowest end of the induction furnace increases the power, so that the induction furnace area covered by the induction coil increases the temperature to 1500-1600 ℃, and the loose body preform corresponding to the induction coil is vitrified at the temperature;
42 After vitrification of the area corresponding to the induction coil at the lowest end of the induction furnace is completed, the power of the induction coil at the lowest end is reduced, so that the temperature of the vitrified preform part corresponding to the induction coil at the lowest end is reduced to 1000-1200 and maintained; while reducing the power of the induction coil at the lowest end, the induction coil at the second lower end nearest to the induction coil at the lowest end starts to boost the power, so that the induction furnace area covered by the induction coil at the second lower end is raised to 1500-1600 ℃, and the loose body preform corresponding to the induction coil at the second lower end is partially vitrified;
43 After vitrification of the loose body preform in the area corresponding to the induction coil at the second lower end is completed, the power of the coil at the second lower end is reduced, and the temperature of the preform part corresponding to the induction coil at the second lower end is reduced to 1000-1200 ℃ and maintained, so that the temperature of the induction coil at the lowest end and the area in the induction furnace corresponding to the induction coil at the second lower end is 1000-1200 ℃ and maintained; while reducing the power of the induction coil at the second lower end, starting to increase the power of the induction coil at the third lower end nearest to the induction coil at the second lower end, so that the induction furnace area covered by the induction coil at the third lower end is increased to 1500-1600 ℃, and the loose body preform part corresponding to the induction coil at the third lower end is vitrified;
44 In this way, the induction furnace is heated layer by layer to partially vitrify the loose preform in the heating region, and the power of the induction coil corresponding to the vitrified preform is reduced to maintain the temperature of the induction furnace region corresponding to the vitrified preform at 1000 ℃ to 1200 ℃;
45 After vitrification of the loose body preform in the area corresponding to the uppermost induction coil is completed, reducing power of the uppermost induction coil, reducing the temperature of the preform part corresponding to the uppermost induction coil to 1000-1200 ℃ and keeping, namely: the temperature of the induction furnace area corresponding to all the induction coils is kept at 1000-1200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311593854.0A CN117401899A (en) | 2023-11-24 | 2023-11-24 | Optical fiber preform sintering equipment and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311593854.0A CN117401899A (en) | 2023-11-24 | 2023-11-24 | Optical fiber preform sintering equipment and method |
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| CN117401899A true CN117401899A (en) | 2024-01-16 |
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| CN202311593854.0A Pending CN117401899A (en) | 2023-11-24 | 2023-11-24 | Optical fiber preform sintering equipment and method |
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- 2023-11-24 CN CN202311593854.0A patent/CN117401899A/en active Pending
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