A method and device for preventing adhesion of tail tube of PCVD deposited optical fiber preform
By using suspended and relatively rotating hollow quartz glass tubes in the PCVD deposition fiber preform process, the problem of gray adhesion of tail tubes is solved, the quality of optical fiber preform rods and the stability of the deposition process are improved, and a more efficient production process is achieved.
Patent Information
- Application Number
- CN202411970868.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-04
AI Technical Summary
During the PCVD deposition of optical fiber preforms, the problem of dust accumulation and adhesion of tail tubes is difficult to solve, especially when deposition of gases containing or other gases, traditional methods cannot effectively prevent adhesion, and there is a risk of difficulty in taking out or damage to the tail tube.
The hollow quartz glass tube with an outer diameter matched is suspended in the middle of the exhaust end stage pipeline, and is kept relatively rotating but not in contact with the tail tube during the deposition process. It is fixed and connected by the O-ring and rotating collet to ensure the stable suspension and relative rotation of the quartz glass tube.
It effectively avoids direct contact between the dust accumulation in the tail tube and the tail tube, reduces the possibility of adhesion, improves the quality of the optical fiber preform and the stability of the deposition process, reduces production costs, and extends the service life of the tail tube.
Smart Images
Figure CN119750901A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of optical fiber manufacturing, and in particular to a method and a device for preventing adhesion of a tail tube of a PCVD deposited optical fiber preform. Background Art
[0002] In optical fiber manufacturing technology, PCVD (Plasma Chemical Vapor Deposition) is a commonly used optical fiber preform deposition process. This process forms the basic structure of the optical fiber preform in the deposition tube through a specific chemical reaction. However, during the PCVD deposition process, a common and difficult problem is dust accumulation in the tail tube.
[0003] Specifically, during the deposition process, not only will the tube produce chlorine-containing waste gas generated by the reaction, but also incompletely vitrified Solid dust. These solid dusts will randomly adhere to the inner wall of the tail pipe at the exhaust end of the deposition tube under the influence of airflow and temperature differences in the deposition tube. The dust accumulation in the tail pipe has a significant impact on the quality of the optical fiber preform and the stability of the deposition process. It may not only cause internal defects in the preform, but also affect the deposition rate and the uniformity of the deposition layer, which ultimately affects the performance of the optical fiber.
[0004] In order to reduce the adverse effects of tail pipe dust accumulation, the industry has tried some solutions. For example, a common practice is to insert a hollow and unfixed quartz glass tube into the exhaust end tail pipe. This quartz glass tube takes over the dust accumulation on the inner surface of the tail pipe, thereby reducing the amount of dust accumulation on the inner wall of the tail pipe to a certain extent. However, when the reaction gas contains or When the gas is highly viscous, the viscosity of the tail pipe dust will increase significantly. In this case, the hollow glass tube inserted into the tail pipe will often adhere to the tail pipe, making it difficult to remove after the deposition is completed, or the tail pipe may be damaged due to excessive friction when it is removed.
[0005] Another method tried is to insert a loose quartz glass rod into the tail pipe. During the deposition process, as the tail pipe rotates, the glass rod rolls in the tail pipe due to gravity and friction, trying to loosen the floating dust and remove it by vacuum. However, when the viscosity of the accumulated dust is high, the glass rod is easy to stick to the tail pipe, thus losing the function of loosening the accumulated dust.
[0006] In summary, the existing tail tube anti-sticking method has obvious limitations when facing the reaction gas with high viscosity. Therefore, a new PCVD deposition tail tube anti-sticking method is urgently needed to solve the problems existing in the existing technology and improve the quality of optical fiber preform and the stability of deposition process. Summary of the invention
[0007] The technical problem to be solved by the present invention is to provide a method and device for preventing adhesion of the tail tube of a PCVD deposited optical fiber preform rod, so as to solve the specific technical problem of dust accumulation and adhesion of the tail tube during the process of PCVD depositing optical fiber preform rod, especially in the process of depositing optical fiber preform rod containing or When the optical fiber preform rod is filled with gas, the viscosity of the dust accumulated inside the tail tube is relatively high. The traditional method of using unfixed quartz glass tubes or glass rods cannot effectively prevent adhesion, and there is a risk of difficulty in removing or damaging the tail tube.
[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: a method for preventing adhesion of a tail tube of a PCVD deposited optical fiber preform, comprising the following steps: Step 1: Make a quartz glass tube with an outer diameter matching the inner hole of the tail pipe at the exhaust end of the deposition tube; Step 2: Insert one end of the quartz glass tube horizontally into the exhaust end carrier connected to the vacuum pump, and use an O-ring to fix the inserted part to ensure that the quartz glass tube is suspended in the middle of the exhaust end carrier pipeline; Step 3: Insert the other end of the quartz glass tube into the middle of the tail pipe at the exhaust end of the deposition tube; Step 4: Use a rotating chuck to connect the exhaust end tail pipe of the deposition tube to the exhaust end carrier, and use an O-ring to seal to ensure the vacuum degree; Step 5: During the deposition process, the rotating chuck is rotated so that the tail pipe at the exhaust end of the deposition tube and the quartz glass tube suspended inside rotate relative to each other but do not touch each other, thereby effectively preventing the tail pipe from sticking during the deposition process.
[0009] In a preferred solution, the fixing method of the quartz glass tube also includes using a quartz glass tube fixing fixture for auxiliary fixing to ensure that it remains suspended and stable during the deposition process.
[0010] In a preferred embodiment, the quartz glass tube is made of high-purity quartz glass.
[0011] In a preferred embodiment, the rotation speed of the rotating chuck can be adjusted to adapt to different deposition process conditions and different viscosities. powder.
[0012] In a preferred embodiment, the rotation speed of the rotary chuck is adjusted according to the requirements of the deposition process to optimize The adhesion effect of powder in quartz glass tube.
[0013] In the preferred solution, a cooling water jacket is also provided outside the tail pipe at the exhaust end of the deposition tube to control the temperature during the deposition process and further reduce Adhesion and adhesion of powders.
[0014] In a preferred embodiment, the exhaust end carrier is also provided with an exhaust end pressure sensor and an exhaust end gas path connecting pipe for monitoring and controlling the gas pressure and airflow during the deposition process to optimize the deposition effect and prevent the tail pipe from sticking.
[0015] In a preferred embodiment, the method is suitable for depositing or Optical fiber preform with gases.
[0016] A device for preventing the tail tube of a PCVD deposited optical fiber preform from sticking is used to implement any one of the methods for preventing the tail tube of a PCVD deposited optical fiber preform from sticking described above, the device comprising a deposition tube and an exhaust end carrier, the exhaust end of the deposition tube is provided with a deposition tube exhaust end tail tube, a quartz glass tube is suspended inside the deposition tube exhaust end tail tube, and the inner holes and outer diameters of the two are matched; a rotating chuck is installed between the deposition tube exhaust end tail tube and the exhaust end carrier, allowing the two to rotate relative to each other but not contact; a fixed quartz glass tube clamp is installed at the exhaust end carrier end, and O-rings are installed on the clamp and the quartz glass tube.
[0017] In the preferred scheme, it also includes an exhaust end pressure sensor installed on the fixture, which is clamped on the exhaust end gas path connecting pipe between the rotating chuck and the quartz glass tube. The outer circle of the exhaust end gas path connecting pipe is covered with a cooling water jacket, and the cooling water jacket extends forward to cover the fixture.
[0018] The present invention provides a method and device for preventing adhesion of a PCVD deposited optical fiber preform tail tube, which has the following beneficial effects: 1. The fixed and relatively rotatable hollow quartz glass tube of the present invention replaces the traditional unfixed quartz glass tube or glass rod, effectively avoiding direct contact between the dust accumulation and the tail pipe, thereby reducing the possibility of adhesion; 2. The present invention realizes the stable suspension and relative rotation of the hollow quartz glass tube during the deposition process through a specific assembly method (such as O-ring fixation and rotary chuck connection), further reducing the risk of adhesion; 3. The innovative fixture design of the present invention has a reasonable fixture structure, such as a fixture for fixing the quartz glass tube and a positioning ring, which ensures the stability and reliability of the hollow quartz glass tube during the deposition process; 4. The design of the fixture of the present invention is easy to install and disassemble, and can adapt to hollow quartz glass tubes of different sizes and shapes, thereby improving the flexibility and applicability of the present invention; 5. The design of the sensor of the present invention introduces monitoring equipment such as pressure sensors to monitor various parameters in the deposition process in real time, such as the pressure in the tube, gas flow rate, etc., to ensure the stability and controllability of the deposition process; 6. The sensor of the present invention can also detect abnormal conditions during the deposition process, such as gas leakage, sudden pressure changes, etc., providing the possibility for timely discovery and resolution of problems; 7. The design of the cooling water jacket of the present invention effectively reduces the temperature during the deposition process by introducing the cooling water jacket, protecting the deposition equipment and the liner from high temperature damage; 8. The design of the cooling water jacket of the present invention also improves the deposition efficiency and quality, so that the deposition process can be carried out under more stable temperature conditions; 9. The design of the rotary chuck of the present invention and the reasonable structure of the rotary chuck ensure the stable suspension and relative rotation of the hollow quartz glass tube during the deposition process, avoiding the direct contact between the dust accumulation and the tail tube, and improving the uniformity and stability of the deposition; 10. The introduction of the rotary chuck of the present invention also enables the operator to more conveniently adjust the position and angle of the hollow quartz glass tube to meet different deposition requirements; 11. The design of the gas connection pipe of the present invention and the reasonable structure of the gas connection pipe ensure that the reaction gas can stably and continuously enter the deposition area and fully react under the action of high-frequency plasma; 12. The gas connection pipe of the present invention has good sealing and corrosion resistance, which prevents the adverse effects of gas leakage and pipeline corrosion on the deposition process; 13. The present invention improves the purity and uniformity of the optical fiber preform by reducing dust accumulation and adhesion of the tail tube, thereby improving the performance of the optical fiber product and significantly improving the quality of the optical fiber preform; 14. The innovative solution of the present invention makes the deposition process more stable and controllable, reduces the occurrence of process fluctuations and abnormal conditions, and improves the stability of the deposition process; 15. The present invention simplifies the dust accumulation treatment process, reduces the damage to the tail pipe when removing the dust accumulation, prolongs the service life of the tail pipe, and thus reduces the production cost; 16. The stable deposition process and efficient deposition rate of the present invention significantly improve production efficiency and shorten the production cycle; 17. The design of the cooling water jacket of the present invention effectively protects the deposition equipment and the liner from high temperature damage, thereby extending the service life of the equipment; 18. The present invention is not only applicable to or The optical fiber preform deposition process using gases such as argon and argon can also be extended to other similar gas deposition processes, providing a new and effective solution for the optical fiber manufacturing industry. 19. The present invention successfully solves the problem of dust accumulation and adhesion on the tail tube during the PCVD deposition of optical fiber preform rods by introducing a series of innovative designs and technical advantages, bringing significant technological progress and economic benefits to the optical fiber manufacturing industry. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention is mainly used in the process of depositing optical fiber preform rods in optical fiber manufacturing PCVD equipment to solve the problem of dust accumulation and adhesion of tail tube. The present invention is further described below in conjunction with the accompanying drawings and implementation examples: Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure: tail pipe 1 of the exhaust end of the deposition tube, quartz glass tube 2, rotating chuck 3, cooling water jacket 4, pressure sensor 5, gas path connecting pipe 6, fixture 7, O-ring 8. DETAILED DESCRIPTION
[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments: Example 1 like Figure 1 As shown, a method for preventing adhesion of a tail tube of a PCVD deposited optical fiber preform comprises the following steps: Step 1: Make a quartz glass tube 2 whose outer diameter matches the inner hole of the tail pipe 1 at the exhaust end of the deposition tube; Step 2: Insert one end of the quartz glass tube 2 horizontally into the exhaust end carrier connected to the vacuum pump, and fix the inserted part with an O-ring 8 to ensure that the quartz glass tube 2 is suspended in the middle of the exhaust end carrier pipeline; Step 3: Insert the other end of the quartz glass tube 2 into the middle of the tail pipe 1 at the exhaust end of the deposition tube; Step 4: Use the rotating chuck 3 to connect the exhaust end tail pipe 1 of the deposition tube with the exhaust end carrier, and use the O-ring 8 to seal to ensure the vacuum degree; Step 5: During the deposition process, the rotating chuck 3 is rotated so that the tail pipe 1 at the exhaust end of the deposition tube and the quartz glass tube 2 suspended inside are relatively rotated but not in contact, thereby effectively preventing the tail pipe from sticking during the deposition process.
[0021] In this embodiment, the fixing method of the quartz glass tube 2 further includes using a fixture 7 for fixing the quartz glass tube 2 for auxiliary fixing, so as to ensure that the quartz glass tube 2 remains suspended and stable during the deposition process.
[0022] Furthermore, the quartz glass tube 2 is made of high-purity quartz glass to ensure its stability and durability during the deposition process.
[0023] Furthermore, the rotation speed of the rotating chuck 3 can be adjusted to adapt to different deposition process conditions and different viscosities. powder.
[0024] Furthermore, the rotation speed of the rotating chuck 3 is adjusted according to the requirements of the deposition process to optimize The adhesion effect of powder in the quartz glass tube 2.
[0025] Furthermore, a cooling water jacket 4 is provided outside the tail pipe 1 at the exhaust end of the deposition tube to control the temperature during the deposition process and further reduce Adhesion and adhesion of powders.
[0026] Furthermore, the exhaust end carrier is also provided with an exhaust end pressure sensor 5 and an exhaust end gas path connecting pipe 6 for monitoring and controlling the gas pressure and gas flow during the deposition process to optimize the deposition effect and prevent the tail pipe from sticking.
[0027] Further, the method is suitable for depositing or The optical fiber preform rod with equal gas can effectively prevent the tail pipe from sticking.
[0028] Example 2 In another preferred embodiment, on the basis of the above-mentioned embodiment 1, a device for preventing the tail tube of a PCVD deposited optical fiber preform from sticking is provided, which is a method for preventing the tail tube of a PCVD deposited optical fiber preform from sticking as described in any one of the embodiments 1, and the device comprises a deposition tube and an exhaust end carrier, the exhaust end of the deposition tube is provided with a deposition tube exhaust end tail tube 1, a quartz glass tube 2 is suspended inside the deposition tube exhaust end tail tube 1, and the inner holes and outer diameters of the two are matched; a rotating chuck 3 is installed between the deposition tube exhaust end tail tube 1 and the exhaust end carrier, allowing the two to rotate relative to each other but not contact; a clamp 7 for fixing the quartz glass tube 2 is installed at the exhaust end carrier end, and an O-ring 8 is installed between the clamp 7 and the quartz glass tube 2.
[0029] In this embodiment, it also includes an exhaust end pressure sensor 5 installed on the fixture 7, an exhaust end gas path connecting pipe 6 clamped between the rotating chuck 3 and the quartz glass tube 2, and the outer circle of the exhaust end gas path connecting pipe 6 is covered with a cooling water jacket 4, and the cooling water jacket 4 extends forward to cover the fixture 7 together.
[0030] Example 3 In another preferred embodiment, based on the above embodiments 1 and 2, this embodiment describes in detail a specific assembly and operation process of anti-sticking of the PCVD deposition tail pipe.
[0031] First, prepare a hollow quartz glass tube 2 whose outer diameter matches the inner diameter of the tail pipe 1 at the exhaust end of the deposition tube. The quartz glass tube 2 needs to be able to withstand high temperature and chemical reaction environment during the deposition process and have good chemical stability and mechanical strength.
[0032] Then, one end of the hollow quartz glass tube 2 is horizontally inserted into the exhaust end carrier connected to the vacuum pump, and the inserted part is fixed with an O-ring 8 to ensure that the quartz glass tube 2 can be suspended in the middle of the exhaust end carrier pipeline; the material and size of the O-ring 8 need to be carefully selected to ensure good sealing and stability.
[0033] Next, the other end of the hollow quartz glass tube 2 is inserted into the middle of the tail pipe 1 at the exhaust end of the deposition tube. The tail pipe 1 at the exhaust end of the deposition tube is connected to the exhaust end carrier using a rotating chuck 3 and sealed with an O-ring 8 to ensure the vacuum degree. The selection and design of the rotating chuck 3 needs to ensure that the tail pipe can be stably driven to rotate during the deposition process without affecting the suspended state of the quartz glass tube 2.
[0034] After the assembly is completed, the deposition equipment is started to start the PCVD deposition process. During the deposition process, the tail pipe 1 at the exhaust end of the deposition tube and the quartz glass tube 2 suspended inside can rotate relative to each other but do not touch each other. This relative rotation setting can effectively prevent Adhesion of powder to the inner wall of the tail pipe.
[0035] In particular, when the deposition process uses or When the reaction gas is a gas such as The powder has a high viscosity and is easy to adhere to the tail pipe; however, since the present invention uses a suspended and relatively rotating quartz glass tube 2, these sticky Most of the powder will adhere to the inner wall of the quartz glass tube 2, and a very small amount may adhere to the inside of the tail tube and the outside of the quartz glass tube 2. Since the two are not in contact, no adhesion will occur.
[0036] After the deposition is completed, the device is turned off. After the device is cooled, the suspended quartz glass tube 2 can be easily taken out, cleaned and replaced. Since the quartz glass tube 2 is not in contact with the tail tube, the tail tube will not be damaged during the removal process.
[0037] Example 4 In another preferred embodiment, based on the above-mentioned embodiment 3, this embodiment provides an implementation method from different angles to demonstrate the diversity and practicality of the technical features of the present invention.
[0038] In this embodiment, in addition to using the above-mentioned hollow quartz glass tube 2 and rotating chuck 3, a cooling water jacket 4 can be further provided on the exhaust end carrier. The function of the cooling water jacket 4 is to cool the tail pipe and the quartz glass tube 2 during the deposition process to reduce the temperature during the deposition process and further reduce Powder adhesion.
[0039] The design of the cooling water jacket 4 needs to ensure good heat transfer between the water jacket and the tail pipe and the quartz glass tube 2, while not affecting the relative rotation between the two; the material and size of the cooling water jacket 4 also need to be selected and designed according to the specific deposition equipment and process parameters.
[0040] During the deposition process, the temperature of the tail pipe and the quartz glass tube 2 can be controlled by adjusting parameters such as the cooling water flow rate and temperature of the cooling water jacket 4, thereby further optimizing the deposition effect and preventing adhesion.
[0041] In addition, this embodiment can further set accessories such as a pressure sensor 5 and a gas path connecting pipe 6 at the exhaust end to monitor the pressure changes and gas flow conditions during the deposition process in real time; the setting of these accessories can help the operator better understand the dynamic changes of the deposition process, so as to adjust the process parameters and optimize the deposition effect in time.
[0042] The above four embodiments demonstrate the specific implementation method and operation process of a PCVD deposition tail tube anti-sticking method of the present invention; through the technical solution of the present invention, the problem of tail tube adhesion in the process of PCVD deposition of preform rods can be effectively solved, and the quality of the preform rods and the stability of the deposition process can be improved; at the same time, the technical solution of the present invention also has the advantages of simple structure, convenient operation, easy implementation, etc., and is suitable for various PCVD deposition equipment and process parameters.
[0043] In the preferred embodiment, the fixing method of the quartz glass tube 2 also includes using a clamp 7 for fixing the quartz glass tube 2 for auxiliary fixing to ensure that it remains suspended and stable during the deposition process; the above arrangement further improves the accuracy and uniformity of the deposition process. At the same time, the design of the clamp 7 takes into account the thermal expansion coefficient, effectively avoiding deformation or cracking of the quartz glass tube 2 due to thermal stress at high temperature.
[0044] In a preferred solution, the quartz glass tube 2 is made of high-purity quartz glass; the above arrangement can ensure that the quartz glass tube 2 has excellent stability and light transmittance in a high temperature environment, while reducing the influence of impurities on the experimental results and improving the accuracy and reliability of the entire system.
[0045] In a preferred embodiment, the rotation speed of the rotating chuck 3 can be adjusted to adapt to different deposition process conditions and different viscosities. Powder; the above settings ensure The powder is evenly distributed on the rotating chuck 3, which improves both the deposition efficiency and the coating quality. In addition, the material of the rotating chuck 3 is also optimized, and has good wear resistance and corrosion resistance, thereby extending the service life of the equipment.
[0046] In a preferred embodiment, the rotation speed of the rotating chuck 3 is adjusted according to the requirements of the deposition process to optimize The above arrangement ensures that the powder adheres to the quartz glass tube 2. The powder is evenly distributed on the inner wall of the quartz glass tube 2, which reduces agglomeration and improves deposition efficiency and finished product quality; at the same time, the solution is also flexible and can quickly adjust the rotation speed according to different process requirements.
[0047] In the preferred solution, a cooling water jacket 4 is also provided outside the tail pipe 1 at the exhaust end of the deposition tube to control the temperature during the deposition process and further reduce The above settings not only improve the deposition efficiency, but also ensure the long-term stable operation of the deposition tube; at the same time, an inert gas protection device is added to the deposition area to effectively isolate impurities in the air, making the prepared The film purity is higher.
[0048] In the preferred solution, the exhaust end carrier is also provided with an exhaust end pressure sensor 5 and an exhaust end gas path connecting pipe 6, which are used to monitor and control the gas pressure and airflow during the deposition process to optimize the deposition effect and prevent the tail pipe from sticking; the above settings not only improve the controllability of the deposition process, but also ensure the uniformity and quality stability of the deposited layer; in addition, the exhaust end carrier is also equipped with an intelligent temperature control system 7, which automatically adjusts the temperature to effectively prevent the deposit from cooling and solidifying in the pipeline.
[0049] In a preferred embodiment, the method is suitable for depositing or The optical fiber preform with gases such as carbon dioxide effectively prevents the tail tube from sticking. The above settings, by precisely controlling the gas concentration and deposition rate, not only ensure the high-quality preparation of the optical fiber preform, but also significantly improve the production efficiency. At the same time, the special coating technology used further enhances the anti-sticking performance of the tail tube and ensures the smooth progress of the production process.
[0050] In the preferred scheme, it also includes an exhaust end pressure sensor 5 installed on the fixture 7, an exhaust end gas path connecting pipe 6 clamped between the rotating chuck 3 and the quartz glass tube 2, and the outer circle of the exhaust end gas path connecting pipe 6 is covered with a cooling water jacket 4, and the cooling water jacket 4 extends forward to cover the fixture 7 together; the above arrangement not only ensures that the exhaust end pressure sensor 5 can accurately monitor the gas path pressure, but also effectively reduces the temperature of the exhaust end gas path connecting pipe 6 and the fixture 7 through the cooling water jacket 4, thereby improving the stability and durability of the overall system.
[0051] In summary, the present invention provides an innovative method and device for preventing adhesion of the tail tube of a PCVD-deposited optical fiber preform rod, which successfully overcomes the technical bottleneck of dust accumulation and adhesion of the tail tube in the PCVD deposition process, especially in the deposition of or When the gas is prone to cause dust accumulation and increased viscosity inside the tail pipe, the traditional method of using unfixed quartz glass tubes or glass rods cannot effectively prevent adhesion and there is a risk of difficulty in removing or damaging the tail pipe, which is difficult to meet production needs; the present invention proposes a revolutionary solution, which uses a hollow quartz glass tube 2 with matching outer diameter for fixing, ensuring that it is suspended in the middle of the exhaust end carrier pipeline and maintains a relative rotation but non-contact state with the tail pipe during the deposition process; through the ingenious design of the O-ring 8, the hollow quartz glass tube 2 is firmly fixed in the exhaust end carrier, which not only ensures its stability but also cleverly avoids direct contact with the tail pipe; at the same time, the innovative design of the rotating chuck 3 makes it easy for the tail pipe 1 at the exhaust end of the deposition tube and the quartz glass tube 2 suspended inside to achieve relative rotation, thereby effectively avoiding the occurrence of adhesion and significantly improving the stability of the deposition process.
[0052] The uniqueness of this dust treatment method is that the viscous or The powder is mainly attached to the suspended quartz glass tube 2, while a small amount of powder attached to the inside of the tail tube and the outer quartz glass tube does not contact each other, so there is no adhesion problem; this method is more efficient and easier to implement than the traditional method. After using this method, the sticky powder no longer causes the tail tube to adhere, thereby ensuring the high-quality output of the optical fiber preform and the continuous stability of the deposition process.
[0053] In addition, the present invention significantly enhances the heat dissipation effect by optimizing the structural design of key components such as the exhaust end carrier, the cooling water jacket 4, the gas path connecting pipe 6, and the clamp 7, and is equipped with a pressure sensor 5 to achieve real-time monitoring and precise adjustment of the temperature and pressure during the deposition process; these innovative designs not only further reduce the occurrence of dust accumulation, but also greatly improve the deposition efficiency and yield of optical fiber preform rods, injecting new technical vitality into the development of the optical fiber communication industry.
[0054] In general, the present invention provides reliable technical support for the production of PCVD deposited optical fiber preforms and promotes the sustainable development of the optical fiber communication industry. Through this innovative solution, we have successfully solved the problem of dust accumulation and adhesion in the tail tube, laying a solid foundation for the high-quality and high-efficiency production of optical fiber preforms, and also providing a strong guarantee for the continuous advancement and wide application of optical fiber communication technology.
Claims
1. A method for preventing adhesion of a PCVD deposited optical fiber preform tail tube, characterized in that: The following steps are involved: Step 1: Make a quartz glass tube (2) whose outer diameter matches the inner hole of the tail pipe (1) at the exhaust end of the deposition tube; Step 2: Insert one end of the quartz glass tube (2) horizontally into the exhaust end carrier connected to the vacuum pump, and use an O-ring (8) to fix the inserted part to ensure that the quartz glass tube (2) is suspended in the middle of the exhaust end carrier pipeline; Step 3: Insert the other end of the quartz glass tube (2) into the middle of the tail pipe (1) at the exhaust end of the deposition tube; Step 4: Use a rotary chuck (3) to connect the exhaust end tail pipe (1) of the deposition tube to the exhaust end carrier, and use an O-ring (8) to seal to ensure vacuum; Step 5: During the deposition process, the rotating chuck (3) is rotated so that the tail pipe (1) at the exhaust end of the deposition tube and the quartz glass tube (2) suspended inside are relatively rotated but not in contact with each other, thereby effectively preventing the tail pipe from sticking during the deposition process.
2. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 1, characterized in that: The method for fixing the quartz glass tube (2) further comprises using a fixture (7) for fixing the quartz glass tube (2) for auxiliary fixing, so as to ensure that the quartz glass tube (2) remains suspended and stable during the deposition process.
3. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 2, characterized in that: The material of the quartz glass tube (2) is high-purity quartz glass.
4. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 3, characterized in that: The rotation speed of the rotating chuck (3) can be adjusted to adapt to different deposition process conditions and different viscosities. powder.
5. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 4, characterized in that: The rotation speed of the rotating chuck (3) is adjusted according to the requirements of the deposition process to optimize The adhesion effect of powder in the quartz glass tube (2).
6. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 5, characterized in that: The invention also includes arranging a cooling water jacket (4) outside the tail pipe (1) at the exhaust end of the deposition pipe to control the temperature during the deposition process and further reduce Adhesion and adhesion of powders.
7. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 6, characterized in that: The exhaust end carrier is also provided with an exhaust end pressure sensor (5) and an exhaust end gas path connecting pipe (6) for monitoring and controlling the gas pressure and gas flow during the deposition process, so as to optimize the deposition effect and prevent the tail pipe from sticking.
8. The method for preventing adhesion of a PCVD deposited optical fiber preform tail tube according to claim 7, characterized in that: The method is suitable for depositing or Optical fiber preform with gases.
9. A device for preventing adhesion of a tail tube of a PCVD deposited optical fiber preform, characterized in that: A method for preventing adhesion of a tail tube of a PCVD deposited optical fiber preform rod is used to implement any one of claims 1 to 8, the device comprising a deposition tube and an exhaust end carrier, the exhaust end of the deposition tube is provided with a deposition tube exhaust end tail tube (1), a quartz glass tube (2) is suspended inside the deposition tube exhaust end tail tube (1), and the inner holes and outer diameters of the two are matched; a rotating chuck (3) is installed between the deposition tube exhaust end tail tube (1) and the exhaust end carrier, allowing the two to rotate relative to each other but not contact; a fixture (7) for fixing the quartz glass tube (2) is installed at the exhaust end carrier end, and an O-ring (8) is installed between the fixture (7) and the quartz glass tube (2).
10. The device for preventing adhesion of the tail tube of a PCVD deposited optical fiber preform according to claim 9, characterized in that: It also includes an exhaust end pressure sensor (5) mounted on the fixture (7), an exhaust end gas path connecting pipe (6) clamped between the rotating chuck (3) and the quartz glass tube (2), the exhaust end gas path connecting pipe (6) being covered with a cooling water jacket (4) on the outer ring, and the cooling water jacket (4) extending forward to cover the fixture (7) together.