CN214211608U - Cleaning device of optical fiber perform sintering furnace - Google Patents
Cleaning device of optical fiber perform sintering furnace Download PDFInfo
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- CN214211608U CN214211608U CN202022399415.4U CN202022399415U CN214211608U CN 214211608 U CN214211608 U CN 214211608U CN 202022399415 U CN202022399415 U CN 202022399415U CN 214211608 U CN214211608 U CN 214211608U
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- Prior art keywords
- tube
- optical fiber
- furnace core
- furnace
- core tube
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 39
- 238000005245 sintering Methods 0.000 title claims abstract description 36
- 238000004140 cleaning Methods 0.000 title claims abstract description 22
- 238000001179 sorption measurement Methods 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 23
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000004809 Teflon Substances 0.000 claims description 10
- 229920006362 Teflon® Polymers 0.000 claims description 10
- 239000012535 impurity Substances 0.000 abstract description 11
- 239000002245 particle Substances 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000110 cooling liquid Substances 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 229920006240 drawn fiber Polymers 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001089 thermophoresis Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Abstract
The invention provides a cleaning device of an optical fiber preform sintering furnace, which comprises an adsorption tube inserted into a furnace core tube of the sintering furnace, wherein the adsorption tube provides suction by a vacuum system, one end of the adsorption tube penetrates through and extends to the bottom of the furnace core tube, the other end of the adsorption tube extends out of the furnace core tube, and a cooling device is arranged at the part of the adsorption tube extending out of the furnace core tube; the cooling device comprises an inner cylinder and an outer cylinder, a closed heat exchange cavity is formed between the inner cylinder and the outer cylinder, and a water inlet and a water outlet are formed in the outer cylinder; and flow guide members are arranged on the outer wall of the inner barrel and the inner wall of the outer barrel at intervals in a staggered manner, so that a tortuous liquid passing channel is formed inside the heat exchange cavity. According to the invention, the quartz glass tube is connected with the cooling device and the vacuum system, so that impurity particles at the bottom of the furnace core tube are adsorbed and pumped away, the bottom of the furnace core tube is effectively cleaned, the sintering state of the furnace core tube is improved, and the quality of the optical fiber preform is improved.
Description
Technical Field
The invention belongs to the technical field of optical fiber perform production, and particularly relates to a cleaning device of a sintering furnace of an optical fiber perform.
Background
The mainstream processes for producing the optical fiber preform at present are VAD (vapor axial deposition) process and OVD (outside vapor deposition) process, wherein large-size optical fiber preform loose bodies are prepared by high-temperature hydrolysis reaction and thermophoresis effect of raw materials such as Sicl4 and the like, and then the transparent optical fiber preform is obtained by dehydration and sintering processes. The sintering furnace is provided with a furnace core pipe and a heating element surrounding the outer side of a high-temperature area of the furnace core pipe, a high-temperature area is formed inside the sealed furnace core pipe through the heating element, loose bodies of the optical fiber perform rods are vitrified under the action of high temperature, and a negative pressure and a clean environment are required to be formed inside the furnace core pipe in the sintering process so as to avoid the invasion and pollution of external impurities. However, when the loose body of the optical fiber preform is sintered, the loose body needs to be hung on the sintering guide rod firstly, then the upper end cover of the furnace core tube is opened, and the loose body slowly descends to the dehydration and sintering initial position. In the process, external impurity particles are easy to fall into the bottom of the furnace core pipe through the sintering guide rod and the end cover, the temperature of the sintering furnace in the standby stage is usually 850 ℃, the temperature of the sintering furnace in the sintering stage is usually 1500 ℃, the impurity particles (especially metal impurities) are easy to diffuse into the optical fiber perform rod through high-temperature volatilization, the sintering quality of the optical fiber perform rod is influenced, the attenuation of the optical fiber drawn by the optical fiber perform rod is increased, and the quality of the optical fiber is further influenced. Once the attenuation of the optical fiber exceeds the allowable range, the optical fiber preform is scrapped in batches, and the furnace core tube must be replaced to solve the problem, which is one of the main reasons influencing the service life of the furnace core tube in the prior art.
Disclosure of Invention
In view of the above, the present invention provides a cleaning device for a sintering furnace of an optical fiber preform, which is provided to overcome the defects in the prior art.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a cleaning device of a sintering furnace for an optical fiber preform rod comprises an adsorption tube inserted into a furnace core tube of the sintering furnace, wherein the adsorption tube provides suction by a vacuum system, one end of the adsorption tube penetrates through and extends to the bottom of the furnace core tube, the other end of the adsorption tube extends out of the furnace core tube, and a cooling device is arranged at the part of the adsorption tube extending out of the furnace core tube; the cooling device comprises an inner cylinder and an outer cylinder, a closed heat exchange cavity is formed between the inner cylinder and the outer cylinder, and a water inlet and a water outlet are formed in the outer cylinder; and flow guide members are arranged on the outer wall of the inner barrel and the inner wall of the outer barrel at intervals in a staggered manner, so that a tortuous liquid passing channel is formed inside the heat exchange cavity.
Further, the adsorption tube is a quartz glass tube.
Furthermore, one end of the inner cylinder is connected with the adsorption tube, and the other end of the inner cylinder is connected with the vacuum system.
Further, the inner cylinder adopts a Teflon pipe, and the inner cylinder is connected with the adsorption pipe through a Teflon joint.
Further, the vacuum system is connected with the inner cylinder through a Teflon joint.
Furthermore, the flow guide members are all annular baffles.
Furthermore, the adsorption tube extends to one end of the bottom of the furnace core tube and is provided with a bell mouth structure.
Further, the water inlet and the water outlet are respectively arranged at two ends of the outer barrel, and are symmetrically arranged along the axis of the outer barrel.
Compared with the prior art, the invention has the following advantages:
according to the invention, the quartz glass tube is connected with the cooling device and the vacuum system, so that impurity particles at the bottom of the furnace core tube are adsorbed and drawn away, the bottom of the furnace core tube is effectively cleaned, the sintering state of the furnace core tube is improved, the quality of an optical fiber preform is improved, the attenuation quality of a drawn optical fiber is ensured, meanwhile, the replacement of the furnace core tube can be reduced, and the cost is saved. The cooling device can effectively improve the cooling effect, when impurity particles at the bottom of the furnace core pipe are cleaned, the high-temperature hot air flow absorbed in the quartz glass pipe cannot cause harm and pollution, and the whole cleaning process is simple and easy to operate.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
FIG. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of a cooling device in an embodiment of the present invention;
FIG. 3 is a schematic diagram showing the decay average of optical fiber preforms drawn optical fibers produced in batches before and after cleaning of the furnace core tube.
Description of reference numerals:
1-sintering furnace; 2-furnace core tube; 3-an adsorption tube; 4-a cooling device; 5-inner cylinder; 6-outer cylinder; 7-a heat exchange cavity; 8-a water inlet; 9-water outlet; 10-a flow guide member; 11-a teflon linker; 12-a bell mouth structure; 13-vacuum system.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
A cleaning device of an optical fiber preform sintering furnace, as shown in figures 1 and 2, comprises a suction pipe 3 inserted into a furnace core pipe 2 of a sintering furnace 1, wherein the suction pipe is provided with suction force by a vacuum system, one end of the suction pipe penetrates through and extends to the bottom of the furnace core pipe, the other end of the suction pipe extends out of the furnace core pipe, and a cooling device 4 is arranged at the part of the suction pipe extending out of the furnace core pipe; during production, the furnace core tube is generally vertically placed in a sintering furnace, a high-temperature area is generated in the furnace core tube through a heating element of the sintering furnace, and the loose body of the optical fiber preform is dehydrated and sintered in the furnace core tube.
The cooling device comprises an inner cylinder 5 and an outer cylinder 6, a closed heat exchange cavity 7 is formed between the inner cylinder and the outer cylinder, and a water inlet 8 and a water outlet 9 are arranged on the outer cylinder; the outer wall of the inner cylinder and the inner wall of the outer cylinder are provided with guide components 10 at intervals and in a staggered manner, so that a zigzag liquid passing channel is formed inside the heat exchange cavity, namely, two adjacent guide components are respectively fixed on the outer cylinder and the inner cylinder. For example, the diversion members are all circular baffles.
The adsorption tube is a quartz glass tube. The inner cylinder is made of Teflon tube. In an alternative embodiment, the inner cylinder has a diameter generally the same as the diameter of the suction tube, and one end of the inner cylinder is connected to the suction tube via a teflon fitting 11, and the other end is connected to (the suction tube of) the vacuum system 13 via a teflon fitting. The high-temperature hot gas flows through the inner cylinder and is discharged after being cooled. In another alternative embodiment, the inner diameter of the inner cylinder is the same as the outer diameter of the adsorption tube, the inner cylinder of the cooling device is sleeved outside the adsorption tube to cool the high-temperature air flow passing through the adsorption tube, and in this embodiment, the adsorption tube can be directly connected with the air suction tube of the vacuum system through a joint. The technical personnel in the field can select the corresponding installation mode according to the actual needs.
Above-mentioned adsorption tube extends to the one end of furnace core socle bottom, is equipped with horn mouth structure 12, can cover bigger adsorption area, and the effect of adsorbing impurity, granule is better.
Generally, the water inlet and the water outlet are respectively arranged at two ends of the outer cylinder, and the water inlet and the water outlet are symmetrically arranged along the axis of the outer cylinder. Guarantee that cooling liquid gets into the back from the water inlet, discharge from the delivery port again after the tortuous liquid passageway that crosses in the heat transfer intracavity, cooling liquid flows through the path length, full play cooling device's cooling effect, in addition, preferably arrange the water inlet on the urceolus lower edge, and the delivery port is arranged on the urceolus upper edge, and cooling effect is better. During specific implementation, the water inlet is connected with the water inlet pipe, the water outlet is connected with the water outlet pipe, and the sectional area of the water inlet pipe is larger than that of the water outlet pipe generally so as to ensure that cooling liquid can fully play a cooling role in the heat exchange cavity.
When cleaning operation is needed in the production process, the sealing end cover of the furnace core pipe is firstly opened, the quartz glass pipe with the lower end wiped by alcohol is vertically inserted into the bottom of the sintering furnace core pipe,
opening a water inlet pipe and a water outlet pipe of the cooling device in sequence; and then, opening a vacuum system switch, cleaning the periphery of the bottom of the furnace core pipe by the quartz glass pipe, and adsorbing impurity particles to a vacuum system.
After the use, the switch of the vacuum system is closed, the quartz glass tube is vertically moved out of the furnace core tube, and the sealing end cover of the furnace core tube is covered.
After the cleaning operation, the dehydration and sintering process of the loose body of the optical fiber perform is continuously carried out, the decay average value of the optical fiber perform drawn fibers produced in batches before and after the furnace core pipe is cleaned is shown in the attached drawing 3, the 1310nm decay of the sintered preform drawn fibers before the furnace core pipe is cleaned is continuously unqualified, and the 1310nm decay of the sintered preform drawn fibers after the furnace core pipe is cleaned is recovered to a normal level, which shows that the cleaning method of the furnace core pipe has obvious effect, the furnace core pipe can be cleaned to replace a new furnace core pipe, so that the service life of the existing furnace core pipe is prolonged, the furnace core pipe replacement and the baking time are saved, and the production efficiency of the optical fiber perform is improved.
According to the invention, the quartz glass tube is connected with the cooling device and the vacuum system, so that impurity particles at the bottom of the furnace core tube are adsorbed and drawn away, the bottom of the furnace core tube is effectively cleaned, the sintering state of the furnace core tube is improved, the quality of an optical fiber preform is improved, the attenuation quality of a drawn optical fiber is ensured, meanwhile, the replacement of the furnace core tube can be reduced, and the cost is saved. The cooling device can effectively improve the cooling effect, when impurity particles at the bottom of the furnace core pipe are cleaned, the high-temperature hot air flow absorbed in the quartz glass pipe cannot cause harm and pollution, and the whole cleaning process is simple and easy to operate.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (8)
1. The utility model provides a cleaning device of optical fiber perform fritting furnace which characterized in that: the adsorption tube is inserted into a furnace core tube of the sintering furnace, the adsorption tube provides suction by a vacuum system, one end of the adsorption tube penetrates through and extends to the bottom of the furnace core tube, the other end of the adsorption tube extends out of the furnace core tube, and a cooling device is arranged at the part of the adsorption tube extending out of the furnace core tube; the cooling device comprises an inner cylinder and an outer cylinder, a closed heat exchange cavity is formed between the inner cylinder and the outer cylinder, and a water inlet and a water outlet are formed in the outer cylinder; and flow guide members are arranged on the outer wall of the inner barrel and the inner wall of the outer barrel at intervals in a staggered manner, so that a tortuous liquid passing channel is formed inside the heat exchange cavity.
2. The apparatus for cleaning a sintering furnace for an optical fiber preform according to claim 1, wherein: the adsorption tube is a quartz glass tube.
3. The apparatus for cleaning a sintering furnace for an optical fiber preform according to claim 1, wherein: one end of the inner cylinder is connected with the adsorption tube, and the other end of the inner cylinder is connected with the vacuum system.
4. The cleaning apparatus for a sintering furnace of an optical fiber preform according to claim 1 or 3, wherein: the inner cylinder adopts the teflon pipe, and it is connected with the adsorption tube through teflon joint.
5. The apparatus for cleaning a sintering furnace for an optical fiber preform according to claim 4, wherein: the vacuum system is connected with the inner cylinder through a Teflon joint.
6. The apparatus for cleaning a sintering furnace for an optical fiber preform according to claim 1, wherein: the flow guide members are all annular baffles.
7. The apparatus for cleaning a sintering furnace for an optical fiber preform according to claim 1, wherein: the adsorption tube extends to one end of the bottom of the furnace core tube and is provided with a bell mouth structure.
8. The apparatus for cleaning a sintering furnace for an optical fiber preform according to claim 1, wherein: the water inlet and the water outlet are respectively arranged at two ends of the outer cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022399415.4U CN214211608U (en) | 2020-10-26 | 2020-10-26 | Cleaning device of optical fiber perform sintering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022399415.4U CN214211608U (en) | 2020-10-26 | 2020-10-26 | Cleaning device of optical fiber perform sintering furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214211608U true CN214211608U (en) | 2021-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022399415.4U Expired - Fee Related CN214211608U (en) | 2020-10-26 | 2020-10-26 | Cleaning device of optical fiber perform sintering furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214211608U (en) |
-
2020
- 2020-10-26 CN CN202022399415.4U patent/CN214211608U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20210917 |