CN115893829A - Vapor deposition method and apparatus for optical fiber preform - Google Patents
Vapor deposition method and apparatus for optical fiber preform Download PDFInfo
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- CN115893829A CN115893829A CN202211458020.4A CN202211458020A CN115893829A CN 115893829 A CN115893829 A CN 115893829A CN 202211458020 A CN202211458020 A CN 202211458020A CN 115893829 A CN115893829 A CN 115893829A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
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Abstract
The invention relates to a vapor deposition method and a device of an optical fiber preform rod, which comprises a main deposition process and an auxiliary deposition process, wherein the main deposition process is to deposit powdery silicon dioxide on the first section of a core rod, the middle section of the core rod and the outer surface of the tail section of the core rod by utilizing a plurality of blowlamps which are sequentially arranged along the axial direction of the core rod, the auxiliary deposition process is to deposit the powdery silicon dioxide on the first section of the core rod and the tail section of the core rod by utilizing the blowlamps positioned at the two ends of the core rod, the outer side of the first section of the core rod forms a first section deposition layer, the outer side of the middle section of the core rod forms a middle section deposition layer, the outer side of the tail section of the core rod forms a tail section deposition layer, the outer surface of the middle section deposition layer is a cylindrical outer side surface, and the outer surfaces of the first section deposition layer and the tail section deposition layer are conical outer surfaces. The invention effectively increases the length of the outer side surface part of the powder rod which is a cylinder, thus effectively increasing the wire drawing length in the subsequent wire drawing process, and further improving the efficiency of preparing the prefabricated rod.
Description
Technical Field
The invention relates to the technical field of core rods, in particular to a vapor deposition method and a vapor deposition device for an optical fiber preform rod.
Background
In the process of manufacturing the optical fiber preform, the OVD (out pressure Deposition) process is considered as a main technical means for reducing the production cost of the optical fiber preform due to a plurality of factors such as high Deposition rate, relatively low requirement for raw material purity, and suitability for large-scale production. The existing vapor deposition device for the optical fiber preform comprises a deposition chamber 11, a core rod clamp and a blast burner assembly, wherein the deposition chamber 11 is a closed space, the core rod clamp is arranged in the deposition chamber 11 and is used for positioning a core rod 12 in a horizontal posture and driving the core rod 12 to rotate around a core rod axis; the blowtorch subassembly is located in deposition chamber 11 and is located the side of plug 12, and the blowtorch subassembly includes a plurality of blowtorches 13 and a blowtorch platform 14, and a plurality of blowtorches 13 set gradually along the axial of plug 12, and blowtorch 13 is used for spraying the powder on the lateral surface of plug 12, and blowtorch platform 14 is used for installing a plurality of blowtorches 13 and drives a plurality of blowtorches 13 along the axial displacement of plug 12. The process comprises the following steps: a torch 13 is used for burning combustible gas (such as hydrogen, natural gas and the like) to generate a large amount of water vapor to chemically react with silicon tetrachloride serving as a raw material, silicon dioxide powder is formed and attached to a core rod 12 which rotates horizontally, and a layer of relatively dense powder II is formedAfter the silicon oxide layer, a silicon dioxide powder rod 121 (the outer surface is a cylindrical outer surface) is finally formed on the surface of the core rod 12 by the reciprocating movement of the torch platform 14, and the silicon tetrachloride and the water vapor which are raw materials are subjected to a chemical reaction to form the silicon dioxide powder according to the following formula:
、/>
. Because three torches are moving, moving the core rod once except for two ends is equivalent to spraying three layers, and only one or two layers are sprayed at two ends. Therefore, the product made by the three-lamp mode has a parabolic oblique wedge-shaped profile, and the head part 122 (the outer surface is the outer side surface of the cone) and the tail part 123 (the outer surface is the outer side surface of the cone) of the prepared prefabricated rod have longer irregular shapes, so that the later wire drawing process is difficult to effectively utilize, great waste is caused, and the cost for preparing the prefabricated rod is increased due to the lower utilization rate of the prefabricated rod.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problem of low utilization rate of the prefabricated rod in the prior art.
In order to solve the technical problem, the invention provides a vapor deposition method of an optical fiber preform, wherein a core rod comprises a core rod first section, a core rod middle section and a core rod tail section which are sequentially arranged along the axial direction of the core rod, the vapor deposition method comprises a main deposition process, the main deposition process is to deposit powdery silicon dioxide on the outer surfaces of the core rod first section, the core rod middle section and the core rod tail section by utilizing a plurality of blowlamps which are sequentially arranged along the axial direction of the core rod, the vapor deposition method further comprises an auxiliary deposition process, the auxiliary deposition process is to deposit powdery silicon dioxide on the core rod first section and the core rod tail section by utilizing blowlamps positioned at two ends of the core rod, a first section deposition layer is formed on the outer side of the core rod first section, a middle section deposition layer is formed on the outer side of the core rod middle section, a tail section deposition layer is formed on the outer side of the core rod tail section, the outer surface of the middle section deposition layer is a cylindrical outer surface, the outer surfaces of the first section deposition layer and the tail section deposition layer are conical outer surfaces, the large end of the conical outer surface is the same as the radial size of the cylindrical outer surface and the cylindrical outer surface is connected with the cylindrical outer surface.
In one embodiment of the present invention, the main deposition process is performed simultaneously with the auxiliary deposition process.
The invention also provides another technical scheme: the utility model provides an optical fiber perform's vapour deposition device for with silica powder deposit on the plug, the plug includes the first section of plug, plug middle section and the plug tail-end that set gradually along its axial, the vapour deposition device includes:
the deposition chamber is a closed space;
the mandrel clamp is arranged in the deposition cavity and used for positioning the mandrel in a horizontal posture and driving the mandrel to rotate around a mandrel shaft;
the main burner assembly is arranged in the deposition cavity and positioned on the radial outer side, the main burner assembly comprises a plurality of main burners and a main burner platform, the main burners are sequentially arranged along the axial direction of the core rod, the main burners are used for spraying powder on the outer side surface of the core rod, and the main burner platform is used for installing the main burners and driving the main burners to move along the axial direction of the core rod;
the vapor deposition device also comprises two auxiliary blowtorch components, the two auxiliary blowtorch components are arranged in the deposition cavity and are respectively positioned on the radial outer side of the first section of the core rod and the radial outer side of the tail section of the core rod, each auxiliary blowtorch component comprises at least one auxiliary blowtorch and an auxiliary blowtorch platform, the auxiliary blowtorch is used for jetting powder on the outer side surface of the end part of the core rod, and the auxiliary blowtorch platform is used for installing the auxiliary blowtorch;
the main burner assembly forms a middle section sedimentary layer on the outer side of the middle section of the mandrel, the main burner assembly and one of the auxiliary burner assemblies form a first section sedimentary layer on the outer side of the first section of the mandrel, the main burner assembly and the other auxiliary burner assembly form a tail section sedimentary layer on the outer side of the tail section of the mandrel, the outer surface of the middle section sedimentary layer is a cylindrical outer side surface, the outer surfaces of the first section sedimentary layer and the tail section sedimentary layer are conical outer surfaces, the radial size of the large end of the conical outer surface is the same as that of the cylindrical outer side surface, and the large end of the conical outer surface is connected with the cylindrical outer side surface.
In one embodiment of the invention, the auxiliary torch platform is a fixed platform.
In one embodiment of the present invention, each of the auxiliary torch assemblies includes one of the auxiliary torches.
In one embodiment of the present invention, the auxiliary torch is provided with a high temperature type mass flow controller.
In one embodiment of the present invention, the main burner assembly includes three main burners.
In one embodiment of the present invention, the main burner assembly and the auxiliary burner assembly are disposed below the core rod.
In one embodiment of the invention, the mandrel holder comprises a clamping mechanism located inside the deposition chamber and a rotary power apparatus located outside the deposition chamber.
In one embodiment of the invention, the main burner platform includes a mobile platform located inside the deposition chamber and a mobile power unit located outside the deposition chamber.
Compared with the prior art, the technical scheme of the invention has the following advantages: compared with the prior art, the vapor deposition method and the vapor deposition device for the optical fiber preform effectively increase the length of the outer side surface of the powder rod which is the cylinder, so that the wire drawing length can be effectively increased in the subsequent wire drawing process, and the efficiency of preparing the preform is improved. The length of the powder preform can be obviously increased by adding one blast burner at the head part and the tail part respectively and carrying out effective deposition rate control, thereby achieving the purpose of reducing cost.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings.
Fig. 1 is a schematic structural diagram of an OVD system in the prior art;
FIG. 2 is a schematic structural view of a vapor deposition apparatus for an optical fiber preform according to the present disclosure;
fig. 3 is a block flow diagram of a vapor deposition method for an optical fiber preform according to the present disclosure.
The specification reference numbers indicate: 11. a deposition chamber; 12. a core rod; 121. a silica powder rod; 122. prefabricating the head of the rod; 123. the tail of the prefabricated rod; 13. a blowtorch; 14. a blowtorch platform;
21. a core rod; 211. a first section of the core rod; 212. a middle core rod section; 213. a tail section of the core rod; 214. depositing a middle section; 215. depositing a layer at the first section; 216. depositing a tail section; 217. a head end increasing part; 218. a tail end extension part; 22. a deposition chamber; 23. a main jet lamp assembly; 231. a main blast lamp; 232. a main spray lamp platform; 24. an auxiliary torch assembly; 241. an auxiliary blowtorch; 242. an auxiliary torch platform.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example one
Referring to fig. 2, a vapor deposition apparatus for an optical fiber preform is used to deposit silica powder on a core rod, the core rod 21 includes a first core rod segment 211, a middle core rod segment 212 and a last core rod segment 213 sequentially arranged along an axial direction thereof, the vapor deposition apparatus includes:
the deposition chamber 22, wherein the deposition chamber 22 is a closed space;
a mandrel holder (not shown in the figure) disposed in the deposition chamber 22, the mandrel holder being configured to position the mandrel 21 in a horizontal posture and drive the mandrel 21 to rotate around a mandrel axis;
the main burner assembly 23 is arranged in the deposition chamber 22 and positioned on the side of the mandrel 21, the main burner assembly 23 comprises a plurality of main burners 231 and a main burner platform 232, the main burners 231 are sequentially arranged along the axial direction of the mandrel 21, the main burners 231 are used for spraying powder on the outer side surface of the mandrel 21, and the main burner platform 232 is used for installing the main burners 231 and driving the main burners 231 to move along the axial direction of the mandrel 21;
the vapor deposition device further comprises two auxiliary torch assemblies 24, the two auxiliary torch assemblies 24 are arranged in the deposition chamber 22 and are respectively located on the sides of the two ends of the core rod 21, each auxiliary torch assembly comprises at least one auxiliary torch 241 and an auxiliary torch platform 242, the auxiliary torch 241 is used for spraying powder on the outer side surface of the end portion of the core rod 21, and the auxiliary torch platform 242 is used for installing the auxiliary torch 241;
the main burner assembly 23 forms a middle section sedimentary deposit 214 outside the middle section 212 of the mandrel, the main burner assembly 23 and one of the auxiliary burner assemblies 24 form a first section sedimentary deposit 215 outside the first section 211 of the mandrel, the main burner assembly 23 and the other auxiliary burner assembly 24 form a tail section sedimentary deposit 216 outside the tail section 213 of the mandrel, the outer surface of the middle section sedimentary deposit 214 is a cylindrical outer surface, the outer surfaces of the first section sedimentary deposit 215 and the tail section sedimentary deposit 216 are conical outer surfaces, the radial size of the conical outer surface is the same as that of the cylindrical outer surface, and the large end of the conical outer surface is connected with the cylindrical outer surface.
Compared with the prior art, the vapor deposition method and the vapor deposition device for the optical fiber preform effectively increase the length of the outer side surface of the powder rod which is a cylinder, the head end increasing part 217 and the tail end increasing part 218, so that the drawing length can be effectively increased in the subsequent drawing process, and the efficiency of preparing the preform is improved. One blast burner is respectively added at the head part and the tail part, and effective deposition rate control is carried out, so that the length of the powder preform can be obviously increased, and the aim of reducing the cost is fulfilled. The flame and the amount of raw material of the main burner and the auxiliary burner can be precisely controlled by the MFC control. Those skilled in the art can set the process parameters according to the desired shape and size, and the main spray lamp can perform deposition with high efficiency without variation of the deposition amount when moving to both ends. The invention can control the profiles of two ends after deposition more precisely on one hand and can follow the deposition speed of the main blast lamp better on the other hand.
An auxiliary torch and an auxiliary torch platform are added at the head of the core rod, an auxiliary torch and an auxiliary torch platform are added at the tail of the core rod, and the two auxiliary torches are deposited synchronously in the process of technological deposition. The specific process comprises the following steps: the head part utilizes an auxiliary blowtorch to burn combustible gas (such as hydrogen, natural gas and the like) to generate a large amount of water vapor to chemically react with the raw material silicon tetrachloride with the flow precisely controlled by a formula, so as to form silicon dioxide powder to be attached to the end face of the head part of the core rod which horizontally rotates; the tail part is burnt in combustible gas (such as hydrogen, natural gas and the like) by using an auxiliary blowtorch to generate a large amount of water vapor to chemically react with the raw material silicon tetrachloride with the flow precisely controlled by a formula, so that silicon dioxide powder is formed and attached to the tail end face of the core rod which rotates horizontally.
In the preferred embodiment of this embodiment, the auxiliary torch platform 242 is a fixed platform. In order to make the structure of the auxiliary blowtorch simpler and to be convenient for reform transform the existing equipment, the auxiliary blowtorch platform is set as a fixed platform. In other embodiments, the auxiliary torch platform body can be designed as a movable platform according to actual needs.
In the preferred embodiment of the present embodiment, each auxiliary torch assembly 24 includes one auxiliary torch 241. In order to make the structure of the auxiliary torch simpler and to facilitate the modification of the existing equipment, each auxiliary torch assembly is configured to include one auxiliary torch. In other embodiments, each auxiliary torch assembly may be configured to include a plurality of auxiliary torches according to actual needs.
In a preferred embodiment of this embodiment, the auxiliary torch 241 is provided with a high-temperature mass flow controller. The high-temperature mass flow controller can accurately control the injection amount of the auxiliary blowtorch, so that the deposition amount is more controllable.
In a preferred embodiment of this embodiment, the main burner assembly 23 includes three main burners 231. Three main torches are provided in this embodiment, which is a mainstream production method in the field. In other embodiments, the main burner assembly may also include four main burners or five main burners or two main burners. The number of the specific main jet lamps is designed according to actual production requirements.
In the preferred embodiment of the present embodiment, the main burner assembly 23 and the auxiliary burner assembly 24 are both provided below the mandrel 21. Because the top of the deposition chamber is generally provided with a suction opening, and the side of the deposition chamber is generally provided with a movable door, the auxiliary blast lamp is not suitable for being directly additionally arranged, and the auxiliary blast lamp is arranged at the bottom of the deposition chamber.
In a preferred embodiment of this embodiment, the mandrel holder comprises a clamping mechanism located inside the deposition chamber and a rotary power apparatus located outside the deposition chamber. The rotary power equipment is a servo motor, and the clamping mechanism directly clamps two ends of the core rod.
In the preferred embodiment of this embodiment, the main jet lamp stage 232 comprises a mobile stage located inside the deposition chamber 22 and a mobile power unit located outside the deposition chamber.
Referring to fig. 2 and 3, the vapor deposition method of the vapor deposition apparatus for an optical fiber preform described above is described below, and the vapor deposition method includes a primary deposition process of depositing powdered silica on the outer surfaces of the first mandrel segment 211, the middle mandrel segment 212, and the last mandrel segment 213 using a plurality of primary torches 231 arranged in sequence along the axial direction of the mandrel 21, and an auxiliary deposition process of depositing powdered silica on the first mandrel segment 211 and the last mandrel segment 213 using auxiliary torches 241 located at both ends of the mandrel 21, wherein the first segment 211 forms a first segment deposition layer 215 on the outer side of the first mandrel segment 211, the middle segment 212 forms a middle segment deposition layer 214 on the outer side of the middle mandrel segment 213, the last segment deposition layer 216 on the outer side of the last mandrel segment 213, the middle segment deposition layer 214 has a cylindrical outer side surface, the outer surfaces of the first segment deposition layer 215 and the last segment deposition layer 216 are conical outer surfaces, the large end of the conical outer surface has the same radial dimension as the cylindrical outer surface, and the large end of the conical outer surface is connected to the cylindrical outer surface.
The flame and the amount of the raw material of the main burner and the auxiliary burner can be precisely controlled by the MFC control. Those skilled in the art can set the process parameters according to the desired shape and size, and the main spray lamp can perform deposition with high efficiency without a change in the deposition amount when moving to both ends. The invention can control the profiles of two ends after deposition more precisely on one hand and can follow the deposition speed of the main blast lamp better on the other hand.
In a preferred embodiment of this embodiment, the main deposition process is performed simultaneously with the auxiliary deposition process. The main deposition process and the auxiliary deposition process can improve deposition efficiency. In other embodiments it may also be: the main deposition process and the auxiliary deposition process are not performed simultaneously, and may be performed in tandem.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Various other modifications and alterations will occur to those skilled in the art upon reading the foregoing description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. A vapor deposition method of an optical fiber preform rod, the core rod comprises a core rod first section, a core rod middle section and a core rod tail section which are sequentially arranged along the axial direction of the core rod, the vapor deposition method comprises a main deposition process, the main deposition process is to deposit powdery silicon dioxide on the outer surfaces of the core rod first section, the core rod middle section and the core rod tail section by utilizing a plurality of blowlamps which are sequentially arranged along the axial direction of the core rod, the vapor deposition method is characterized by further comprising an auxiliary deposition process, the auxiliary deposition process is to deposit the powdery silicon dioxide on the core rod first section and the core rod tail section by utilizing blowlamps positioned at two ends of the core rod, the outer side of the core rod first section forms a first section deposition layer, the outer side of the core rod middle section forms a middle section deposition layer, the outer side of the core rod tail section forms a tail section deposition layer, the outer surface of the deposition layer is a cylindrical outer surface, the outer surfaces of the first section and the tail section deposition layer are conical outer surfaces, the large end of the conical outer surface is the same as the radial size of the cylindrical outer surface, and the large end of the conical outer surface is connected with the cylindrical outer surface.
2. A vapour deposition process according to claim 1, wherein the primary deposition process is carried out simultaneously with the secondary deposition process.
3. The utility model provides an optical fiber perform's vapor deposition device for with silica powder deposit on the plug, the plug includes the first section of plug, plug middle section and the plug end section that set gradually along its axial, the vapor deposition device includes:
the deposition chamber is a closed space;
the mandrel clamp is arranged in the deposition cavity and used for positioning the mandrel in a horizontal posture and driving the mandrel to rotate around a mandrel shaft;
the main burner assembly is arranged in the deposition cavity and positioned on the radial outer side, the main burner assembly comprises a plurality of main burners and a main burner platform, the main burners are sequentially arranged along the axial direction of the core rod, the main burners are used for spraying powder on the outer side surface of the core rod, and the main burner platform is used for installing the main burners and driving the main burners to move along the axial direction of the core rod;
the device is characterized by further comprising two auxiliary torch components, wherein the two auxiliary torch components are arranged in the deposition cavity and are respectively positioned on the radial outer side of the first section of the core rod and the radial outer side of the tail section of the core rod, each auxiliary torch component comprises at least one auxiliary torch and an auxiliary torch platform, the auxiliary torch is used for spraying powder on the outer side surface of the core rod, and the auxiliary torch platform is used for installing the auxiliary torch;
the main burner assembly forms a middle section sedimentary layer on the outer side of the middle section of the mandrel, the main burner assembly and one of the auxiliary burner assemblies form a first section sedimentary layer on the outer side of the first section of the mandrel, the main burner assembly and the other auxiliary burner assembly form a tail section sedimentary layer on the outer side of the tail section of the mandrel, the outer surface of the middle section sedimentary layer is a cylindrical outer side surface, the outer surfaces of the first section sedimentary layer and the tail section sedimentary layer are conical outer surfaces, the radial size of the large end of the conical outer surface is the same as that of the cylindrical outer side surface, and the large end of the conical outer surface is connected with the cylindrical outer side surface.
4. A vapor deposition apparatus according to claim 3, wherein the auxiliary torch platform is a fixed platform.
5. A vapor deposition apparatus according to claim 3, wherein each of said auxiliary torch assemblies comprises one of said auxiliary torches.
6. A vapor deposition apparatus according to claim 3, wherein said auxiliary torch is provided with a high temperature type mass flow controller.
7. A vapor deposition apparatus according to claim 3, wherein the main burner assembly includes three main burners.
8. A vapor deposition apparatus according to claim 3, wherein the main burner assembly and the auxiliary burner assembly are provided below the core rod.
9. A vapour deposition apparatus according to claim 3, wherein the mandrel holder comprises a clamping mechanism located inside the deposition chamber and a rotary power device located outside the deposition chamber.
10. A vapor deposition apparatus according to claim 3, wherein the main torch platform comprises a moving platform inside the deposition chamber and a moving power device outside the deposition chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211458020.4A CN115893829A (en) | 2022-11-16 | 2022-11-16 | Vapor deposition method and apparatus for optical fiber preform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211458020.4A CN115893829A (en) | 2022-11-16 | 2022-11-16 | Vapor deposition method and apparatus for optical fiber preform |
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| Publication Number | Publication Date |
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| CN115893829A true CN115893829A (en) | 2023-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211458020.4A Pending CN115893829A (en) | 2022-11-16 | 2022-11-16 | Vapor deposition method and apparatus for optical fiber preform |
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| CN (1) | CN115893829A (en) |
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- 2022-11-16 CN CN202211458020.4A patent/CN115893829A/en active Pending
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