CN209456304U - A kind of sintering equipment of preform - Google Patents
A kind of sintering equipment of preform Download PDFInfo
- Publication number
- CN209456304U CN209456304U CN201822233098.1U CN201822233098U CN209456304U CN 209456304 U CN209456304 U CN 209456304U CN 201822233098 U CN201822233098 U CN 201822233098U CN 209456304 U CN209456304 U CN 209456304U
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- China
- Prior art keywords
- pipe
- furnace
- sintering
- preform
- furnace heart
- 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.)
- Expired - Fee Related
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 49
- 238000010438 heat treatment Methods 0.000 claims abstract description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 32
- 239000010439 graphite Substances 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 238000007710 freezing Methods 0.000 claims 1
- 230000008014 freezing Effects 0.000 claims 1
- 239000007789 gas Substances 0.000 description 22
- 239000013307 optical fiber Substances 0.000 description 7
- 230000018044 dehydration Effects 0.000 description 6
- 238000006297 dehydration reaction Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000011261 inert gas Substances 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- VXEGSRKPIUDPQT-UHFFFAOYSA-N 4-[4-(4-methoxyphenyl)piperazin-1-yl]aniline Chemical compound C1=CC(OC)=CC=C1N1CCN(C=2C=CC(N)=CC=2)CC1 VXEGSRKPIUDPQT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005906 dihydroxylation reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000005049 silicon tetrachloride Substances 0.000 description 1
- IEXRMSFAVATTJX-UHFFFAOYSA-N tetrachlorogermane Chemical compound Cl[Ge](Cl)(Cl)Cl IEXRMSFAVATTJX-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Landscapes
- Furnace Details (AREA)
Abstract
The utility model relates to a kind of sintering equipments of preform, including the furnace heart pipe for accommodating preform loosening body, the air inlet pipe that is connected to furnace heart pipe lower end, escape pipe, the heating graphite pipe around the setting of furnace heart tube outside and the sintering stove outer covering around the setting of heating graphite tube outside being connected to furnace heart pipe upper end, seal chamber is constituted between the sintering stove outer covering and heating graphite pipe, and heating coil moving up and down is provided in seal chamber.The preform sintering equipment of the utility model can reduce stick risk, effectively reduce furnace heart length of tube, the temperature accuracy being effectively improved in sintering furnace and thermal field uniformity.
Description
Technical field
The utility model relates to a kind of sintering equipments of preform, belong to preform manufacturing technology field.
Background technique
VAD (vapor axial deposition) and OVD (Outside Vapor deposition) are usually used in the production of large-scale optical fiber prefabricated rods, VAD
Include depositing and being sintered two steps with OVD technique, first uses the raw materials such as silicon tetrachloride, germanium tetrachloride anti-by pyrohydrolysis
The preform loosening body of white should be obtained, preform loosening body is carried out to high temperature in sintering furnace and is taken off in target rod
Water, sintering obtain transparent preform.Wherein, preform loosening body sintering furnace is the important of manufacture preform
Apparatus, the performance superiority and inferiority of sintering furnace determine preform key parameter such as index distribution, water peak hydroxy radical content
And internal microstructure.
The key performance of preform sintering furnace includes temperature accuracy, thermal field uniformity etc., wherein sintering furnace temperature
Too low that preform loosening body cannot be made to be dehydrated or be sintered completely transparent, temperature is excessively high, and preform can be made to be easy to stretch
Deformation；In addition, sintering zone must have thermal field uniformity, the optical fiber prefabricating rod product ability entire body being sintered is transparent, internal
Internal force is smaller, does not have microdefect etc..However, the temperature accuracy and thermal field uniformity of current preform sintering furnace are more difficult
Guarantee, to guarantee the excellent performance parameter of preform, preform needs to move up and down when being sintered in sintering furnace, with
It is sintered the surface of preform equably, but preform moves up and down and is easy to appear stick phenomenon, and one
There is stick phenomenon in denier, then needs to readjust, the key equipment part of replacement sintering furnace, affect the steady in a long-term of sintering furnace
Property.
Utility model content
Technical problem to be solved by the utility model is: for solve existing fiber prefabricated rods sintering furnace temperature accuracy and
Thermal field uniformity is relatively difficult to guarantee long-time stability, preform have it is larger fall stick risk the technical issues of, a kind of optical fiber is provided
The sintering equipment of prefabricated rods.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
A kind of sintering equipment of preform, including the furnace heart pipe and the furnace heart for accommodating preform loosening body
Pipe lower end connection air inlet pipe, escape pipe be connected to furnace heart pipe upper end, around furnace heart tube outside be arranged heating graphite pipe and
Around the sintering stove outer covering of heating graphite tube outside setting, seal chamber is constituted between the sintering stove outer covering and heating graphite pipe,
Heating coil moving up and down is provided in seal chamber.
Preferably, in seal chamber, the upper end of heating coil and/or lower end be provided with upper supplementary heating element and/or under it is auxiliary
Heating member is helped, upper supplementary heating element and/or lower supplementary heating element carry out heating work after heating coil leaves.
Preferably, the air inlet pipe is connected by the first intake valve, flowmeter with air supply source, the escape pipe and exhaust gas
Processing unit is connected, and the pressure sensor being connected to furnace heart pipe is additionally provided on the furnace heart pipe.
Preferably, gas pre-mixed tank is provided between the air inlet pipe and furnace heart pipe, gas pre-mixed tank passes through the second air inlet
Valve is connected with furnace heart pipe.
Preferably, the sintering stove outer covering has recirculated water cooling or air cooling equipment, is provided on the furnace heart pipe and furnace
The temperature sensor of heart pipe connection.
Preferably, the heating graphite tube outer surface is provided with disorderly arranged heat preservation graphite felt, the heat preservation graphite felt
It is provided with protecting tube outside.
Preferably, several apertures are offered on the protecting tube, the upper end and/or lower end of heating coil are provided with temperature-sensitive spy
Head and abnormal acoustic-optic alarm.
Preferably, the furnace heart pipe top is provided at least two layers of sealing cover, and furnace heart pipe upper end is also connected with protective gas
Air inlet pipe.
The beneficial effects of the utility model are:
The sintering equipment of preform of the present invention is provided with heating graphite pipe around furnace heart tube outside, surrounds heating graphite
Tube outside is provided with sintering stove outer covering, and furnace can be parallel to by being provided in the seal chamber between heating graphite pipe and sintering stove outer covering
The heating coil that heart pipe direction moves up and down can make optical fiber prefabricating to heating graphite pipe in such a way that coil moves up and down
Stick loosening body does not need to move up and down, and reduces stick risk, and can effectively reduce furnace heart length of tube, furnace heart length of tube only needs
Meet the length of preform loosening body, the temperature accuracy that can also be effectively improved in preform sintering furnace
With thermal field uniformity；Further, the gas in the sintering equipment input furnace heart pipe of the utility model is introduced into gas pre-mixed tank in advance,
It injects in furnace heart pipe after mixing, each gas, which is sufficiently mixed, uniformly facilitates thermal field uniformity, can make the predispersed fiber of production
Stick internal stress processed is smaller, and dehydroxylation and vitrifying effect are good；In addition, the sintering equipment installation of the utility model and maintenance side
Just, it is suitble to large-scale production.
Detailed description of the invention
The present invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the sintering furnace sectional structure chart of the utility model embodiment 1；
Appended drawing reference in figure are as follows: 1- air inlet pipe, 2- gas buffer tank, 3- furnace heart pipe, 4- heating graphite pipe, 5- heat preservation
Layer, 6- protecting tube, 7- heating coil, 8- escape pipe, 9- are sintered stove outer covering, 10- preform loosening body, and 11- first is sealed
Lid 11, the second sealing cover of 12-, 13- third sealing cover, 14- pressure sensor, 15- temperature sensor.
Specific embodiment
The utility model is described in further detail presently in connection with attached drawing.These attached drawings are simplified schematic diagram,
Only illustrate the basic structure of the utility model in a schematic way, therefore it only shows composition related with the utility model.
Embodiment 1
A kind of sintering equipment of preform is present embodiments provided, as shown in Figure 1, including for accommodating optical fiber prefabricating
The furnace heart pipe 3 of stick loosening body, the air inlet pipe 1 being connected to 3 lower end of furnace heart pipe, the escape pipe 8 being connected to 3 upper end of furnace heart pipe surround
The heating graphite pipe 4 being arranged outside furnace heart pipe 3 and the sintering stove outer covering 9 being arranged outside heating graphite pipe 4, the sintering furnace
Seal chamber is constituted between shell 9 and heating graphite pipe 4, is provided with heating coil 7 moving up and down in seal chamber, when work,
It is passed through inert gas in seal chamber, seal chamber is made to be in the state of a high pressure, being sintered the gas outside stove outer covering 9 will not enter
Into seal chamber, heating coil 7 and protecting tube 6 are not easy to be oxidized.
In the seal chamber, the upper end of heating coil and/or lower end be provided with supplementary heating element 17 and/or lower auxiliary plus
Warmware 16, upper supplementary heating element 17 and/or lower supplementary heating element 16 carry out heating work after heating coil 7 leaves, this design
Temperature control in furnace heart pipe 3 can be made more accurate, reduction heating coil 7 moves up and down frequency and speed, further increases
Sintering velocity and quality.
The air inlet pipe 1 is connected by the first intake valve, flowmeter with air supply source, the escape pipe 8 and exhaust-gas treatment
Device is connected, and the pressure sensor 14 being connected to furnace heart pipe 3 is additionally provided on the furnace heart pipe 3, for detecting in furnace heart pipe 3
Gas pressure, pressure sensor connect with PLC controller electric signal, and the pressure that can be obtained according to PLC controller passes through stream
Meter adjusts charge flow rate, it is ensured that gas steadily enters in furnace heart pipe 3.
Be provided with gas pre-mixed tank 2 between the air inlet pipe 1 and furnace heart pipe 3, gas pre-mixed tank 2 by the second intake valve with
Furnace heart pipe 3 is connected, and the various gases entered from air inlet pipe 1 first pass through gas pre-mixed tank 2 after mixing, is re-filled with furnace heart pipe
In 3, air turbulence bring thermal field inhomogeneities is avoided.
The sintering stove outer covering 9 has recirculated water cooling or air cooling equipment, is provided with and furnace heart pipe 3 on the furnace heart pipe 3
The temperature sensor 15 of connection, temperature sensor is connect with PLC controller electric signal, when in the furnace heart pipe 3 that PLC controller obtains
When the temperature is excessively high, 7 temperature of heating coil is adjusted by recirculated water cooling or air cooling equipment, when the furnace heart pipe 3 that PLC controller obtains
When interior temperature is too low, PLC program can control heating coil 7 to mend temperature automatically, make to reach required temperature in furnace heart pipe 3.
4 outer surface of heating graphite pipe is provided with disorderly arranged heat preservation graphite felt 5, to reduce heating graphite pipe 4
Heat losses reach preferable heat insulation effect, can save electric energy, reduce production cost；The outer surface of the heat preservation graphite felt 5
It is provided with protecting tube, prevents moving up and down for heating coil 7 from scratching heating graphite pipe 4.
Several apertures are offered on the protecting tube 6, the upper end and/or lower end of heating coil 7 are provided with temperature-sensing probe, sense
Temperature probe can detect by aperture and indicate the temperature of heating graphite pipe 3, and temperature-sensing probe is connect with PLC controller electric signal,
When 3 temperature of heating graphite pipe that PLC controller obtains is too low, PLC program can control heating coil 7 to mend temperature automatically, when PLC is controlled
When the temperature is excessively high, PLC program can control recirculated water cooling or air cooling equipment to adjust heating coil to the heating graphite pipe 3 that device processed obtains
7 temperature；It is additionally provided with abnormal acoustic-optic alarm on the heating coil 7, has sound-light alarm if there is unusual condition, it is different
It often include cooling water or cold wind temperature, 3 temperature anomaly of heating graphite pipe etc. in sintering stove outer covering 9.
3 top of furnace heart pipe is provided at least two layers of sealing cover, if the sealing device of the present embodiment includes the first sealing
Lid 11, the second sealing cover 12 and third sealing cover 13 can be effectively prevented outside air and impurity pollution 3 cavity of furnace heart pipe and use up
It may prevent heat from leaking.
3 upper end of furnace heart pipe is also connected with protective gas air inlet pipe, is passed through inert gas by protective gas air inlet pipe,
Keep the air pressure in furnace heart pipe 3 more stable.
Embodiment 2
A kind of sintering method of preform, comprising the following steps:
Preform loosening body 10 to be sintered is fixedly mounted in furnace heart pipe 3, and makes preform loosening body
10 rotations, and it will be passed through inert gas in seal chamber, so that seal chamber is in high pressure conditions；Wherein, preform is loose
During body 10 is mounted in furnace heart pipe 3, sealing cover is not installed on the top of furnace core tube 3, i.e., tears sealing cover from furnace core tube 3 open
Get off, be installed on furnace core tube 3 after preform loosening body 10 enters furnace core tube 3, then by sealing cover, carries out furnace core tube 3
Sealing；
Inert protective gas (such as nitrogen, argon gas, helium) and chlorine are passed through into furnace core tube 3 by air inlet pipe 1, makes furnace core
Overpressure is in barotropic state；
Heating coil 7 is moved up and down, so that the temperature in furnace core tube 3 is reached dehydration temperature, and keep optical fiber prefabricating
Dehydration is completed in 10 rotation of stick loosening body；
Close chlorine, continue through air inlet pipe 1 be continually fed into furnace core tube 3 inert protective gas (such as nitrogen, argon gas,
Helium), maintain heating coil 7 move up and down with 10 rotation of preform loosening body, so that the temperature in furnace core tube 3 is reached glass
Change treatment temperature, until completing vitrifying processing.
Preferably, the dehydration temperature is 1050-1250 DEG C (such as 1050 DEG C, 1100 DEG C, 1200 DEG C, 1250 DEG C),
The heating rate for reaching dehydration temperature is 3-5 DEG C/min (such as 3 DEG C/min, 4 DEG C/min, 5 DEG C/min), dehydration process
The movement speed of middle heating coil 7 is 3-6mm/min (such as 3mm/min, 4mm/min, 5mm/min, 6mm/min), optical fiber prefabricating
The rotation speed of stick loosening body 10 is 3-6rpm (such as 3rpm, 4rpm, 5rpm, 6rpm)；Vitrifying treatment temperature is 1450-1550
DEG C (such as 1450 DEG C, 1500 DEG C, 1550 DEG C), the heating rate for reaching vitrifying treatment temperature from dehydration temperature is 6-9 DEG C/
Min (such as 6 DEG C/min, 7 DEG C/min, 9 DEG C/min), the movement speed of heating coil 7 is 7-10mm/ in vitrifying treatment process
Min (such as 7mm/min, 8mm/min, 9mm/min, 10mm/min), the rotation speed of preform loosening body 10 are 3-6rpm
(such as 3rpm, 4rpm, 5rpm, 6rpm).
It is enlightenment, through the above description, related work people with the above-mentioned desirable embodiment according to the utility model
Member can carry out various changes and amendments in the range of without departing from this item utility model technical idea completely.This item is real
It is not limited to the contents of the specification with novel technical scope, it is necessary to its technology is determined according to scope of the claims
Property range.
Claims (8)
1. a kind of sintering equipment of preform, which is characterized in that including the furnace heart for accommodating preform loosening body
Pipe (3), the air inlet pipe (1) being connected to furnace heart pipe (3) lower end, the escape pipe (8) being connected to furnace heart pipe (3) upper end surround the furnace heart
The sintering stove outer covering (9) managing the heating graphite pipe (4) being arranged outside (3) and being arranged outside heating graphite pipe (4), the burning
Seal chamber is constituted between freezing of a furnace shell (9) and heating graphite pipe (4), and heating coil moving up and down is provided in seal chamber
(7)。
2. the sintering equipment of preform according to claim 1, which is characterized in that in seal chamber, heating coil
Upper end and/or lower end be provided with supplementary heating element (17) and/or lower supplementary heating element (16), upper supplementary heating element (17)
And/or lower supplementary heating element (16) carries out heating work after heating coil (7) leaves.
3. the sintering equipment of preform according to claim 1 or 2, which is characterized in that the air inlet pipe (1) passes through
First intake valve, flowmeter are connected with air supply source, and the escape pipe (8) is connected with emission-control equipment, the furnace heart pipe
(3) pressure sensor (14) being connected to furnace heart pipe (3) is additionally provided on.
4. the sintering equipment of preform according to claim 1 or 2, which is characterized in that the air inlet pipe (1) and furnace
It is provided between heart pipe (3) gas pre-mixed tank (2), gas pre-mixed tank (2) is connected by the second intake valve with furnace heart pipe (3).
5. the sintering equipment of preform according to claim 1 or 2, which is characterized in that the sintering stove outer covering (9)
With recirculated water cooling or air cooling equipment, the temperature sensor being connected to furnace heart pipe (3) is provided on the furnace heart pipe (3)
(15)。
6. the sintering equipment of preform according to claim 1 or 2, which is characterized in that the heating graphite pipe (4)
Outer surface is provided with disorderly arranged heat preservation graphite felt (5), is provided with protecting tube (6) outside the heat preservation graphite felt (5).
7. the sintering equipment of preform according to claim 6, which is characterized in that opened up on the protecting tube (6)
There are several apertures, the upper end and/or lower end of heating coil (7) are provided with temperature-sensing probe and abnormal acoustic-optic alarm.
8. the sintering equipment of preform according to claim 1 or 2, which is characterized in that furnace heart pipe (3) top
It is provided at least two layers of sealing cover, furnace heart pipe (3) upper end is also connected with protective gas air inlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822233098.1U CN209456304U (en) | 2018-12-28 | 2018-12-28 | A kind of sintering equipment of preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822233098.1U CN209456304U (en) | 2018-12-28 | 2018-12-28 | A kind of sintering equipment of preform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209456304U true CN209456304U (en) | 2019-10-01 |
Family
ID=68042718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822233098.1U Expired - Fee Related CN209456304U (en) | 2018-12-28 | 2018-12-28 | A kind of sintering equipment of preform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209456304U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111320375A (en) * | 2020-04-13 | 2020-06-23 | 远东通讯有限公司 | VAD loose body dehydration sintering device |
| CN113716858A (en) * | 2020-05-25 | 2021-11-30 | 中天科技精密材料有限公司 | Sintering equipment and sintering method |
| CN115536264A (en) * | 2022-09-27 | 2022-12-30 | 浙江富通光纤技术有限公司 | Automatic air supply device for optical fiber preform sintering process and control method thereof |
-
2018
- 2018-12-28 CN CN201822233098.1U patent/CN209456304U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111320375A (en) * | 2020-04-13 | 2020-06-23 | 远东通讯有限公司 | VAD loose body dehydration sintering device |
| CN113716858A (en) * | 2020-05-25 | 2021-11-30 | 中天科技精密材料有限公司 | Sintering equipment and sintering method |
| CN115536264A (en) * | 2022-09-27 | 2022-12-30 | 浙江富通光纤技术有限公司 | Automatic air supply device for optical fiber preform sintering process and control method thereof |
| CN115536264B (en) * | 2022-09-27 | 2023-12-08 | 浙江富通光纤技术有限公司 | Automatic air supply device for optical fiber preform sintering process and control method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191001 |