Optical fiber preform processing device and method thereof

Abstract

The invention discloses an optical fiber preform processing device and method, and relates to the technical field of optical fiber preform processing, the optical fiber preform processing device comprises a deposition chamber, a rotary elevator is arranged in the middle of the upper end of the deposition chamber, an optical fiber preform is fixed at the bottom of the rotary elevator, and a graphite heater is arranged at the upper part of the inner wall of the deposition chamber. The blowtorch mechanism adopts the design of spiral laminated distribution, so that oxyhydrogen flames can cover a larger area, the chance of contact between reaction gas and the flames is increased, effective generation of # imgabs0 particles is promoted, the jet flow of the blowtorch mechanism from the bottom to the top is gradually reduced, conical spiral distribution is formed, and the effect of increasing the flow rate of the blowtorch mechanism is achieved. It is ensured that more heat and larger flames are generated in the initial stage of deposition, namely near a target rod core, the deposition process can be rapidly started, the flame size is adjusted along with the growth of a preform so as to adapt to the change of the deposition rate, and the deposition uniformity in the whole process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber preform processing, and in particular to an optical fiber preform processing device and method thereof. Background Art

[0002] For example, the publication number is CN106219961A, and the name is a device and method for preparing optical fiber preform rods by VAD. The device includes a vertical frame, on which a lifting chuck is installed, and the lifting chuck is connected to a cantilever frame, and a rotating suspension rod is installed at the front end of the cantilever frame. A reaction chamber for deposition is correspondingly installed below the rotating suspension rod, and a core layer burner and a cladding burner are respectively provided in the reaction chamber. A laser rangefinder is installed outside the reaction chamber, and the distance measuring point of the laser rangefinder corresponds to the deposition formation position of the core layer of the preform rod above the core layer burner, which is used to detect the diameter of the core layer of the preform rod. The invention has a simple structure, high measurement accuracy, fast feedback, strong reliability, and is easy to operate and use; it can effectively control the core layer diameter of the deposited preform rod, so that the core diameter of the produced optical fiber preform rod is uniform, thereby improving the processing quality of the preform rod.

[0003] However, the above-mentioned torch design often makes it difficult to achieve flame coverage over a large area, resulting in insufficient contact between the reaction gas and the flame, which affects The efficiency and uniformity of particle generation, and during the deposition process, As the particles continue to accumulate, the diameter of the preform gradually increases, causing the distance between the blowtorch mechanism and the surface of the preform to change, thereby affecting the uniformity of deposition. In addition, the reaction gas and flame produce irregular fluctuations, making it difficult to ensure the consistency and repeatability of the entire deposition process. Therefore, the present application provides an optical fiber preform processing device and method to meet the needs. Summary of the invention

[0004] The purpose of the present application is to provide an optical fiber preform processing device and method thereof, which can effectively solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an optical fiber preform processing device, comprising a deposition chamber, a rotary elevator is arranged at the middle of the upper end of the deposition chamber, and an optical fiber preform is fixed at the bottom of the rotary elevator, a graphite heater is arranged at the upper part of the inner wall of the deposition chamber, and a mixed flow cavity mechanism for regulating the vortex mode of the hydrogen-oxygen flame and controlling the reaction gas to mix and deposit on the surface of the target material is arranged on the inner wall of the deposition chamber and below the graphite heater, a plurality of blowtorch mechanisms for spraying hydrogen-oxygen flames are arranged on the inner wall of the mixed flow cavity mechanism in a spirally stacked manner, and the jet flow rates of the plurality of blowtorch mechanisms increase from high to low in sequence, and the blowtorch mechanisms are distributed in a conical spiral, and the distance between the uppermost blowtorch mechanism and the central axis of the optical fiber preform is greater than the distance between the lowermost blowtorch mechanism and the central axis of the optical fiber preform; The bottom of the mixed flow chamber mechanism is provided with a ring-shaped reaction gas ejection mechanism to cooperate with the burner mechanism to control A reactive gas blowing mechanism for depositing particles on an optical fiber preform.

[0006] Among them, the mixed flow chamber mechanism includes an outer shell, which is fixedly mounted on the inner wall of the deposition chamber and is located below the graphite heater. The bottom wall of the outer shell is provided with an inner shell. The inner shell and the outer shell are combined to form a sealed cavity, and a plurality of mixed gas tubes distributed in a circular array are provided inside the cavity, and the mixed gas tubes are attached to the inner wall of the outer shell.

[0007] Among them, a temperature-insulating hollow cylinder is arranged at the upper end of the inner shell, and the interior of the combined cavity of the outer shell and the inner shell is filled with an inert heat-insulating gas, and is connected to the external circulating air pipe of the deposition chamber for heat insulation.

[0008] Wherein, a magnetic coil for generating an electromagnetic field and thus affecting the shape of the flame is arranged in the combined cavity of the outer shell and the inner shell, and the magnetic coil is located in the cavity between the thermal insulation hollow cylinder and the outer shell.

[0009] The blowtorch mechanism comprises a blowtorch shell, and a plurality of guide vanes are arranged inside the blowtorch shell and are evenly spaced and used to control the flow direction of hydrogen and oxygen gases. The guide vanes are in the shape of flat water drops.

[0010] A diverter plate for uniformly controlling the discharge of hydrogen and oxygen gases is arranged inside the blowtorch shell, a plurality of through holes distributed in a rectangular array are opened on the outer surface of the diverter plate, a plurality of rib partitions distributed at equal intervals for guiding the gas into the through holes are arranged on one side of the diverter plate, and the rib partitions are located on the side away from the guide plate.

[0011] The gas outlet of the blowtorch shell is a gradually narrowing and widening outlet for accelerating the ejection of hydrogen and oxygen gases. A ventilation pipe is arranged on one side of the outer surface of the blowtorch shell. The ventilation pipe passes through the inner shell and the heat-insulating hollow cylinder and communicates with the interior of the mixed gas pipe.

[0012] Among them, the reaction gas blowing mechanism includes an air chamber, which is fixedly installed on the inner wall of the deposition chamber. A number of inclined tubes distributed in a circular array are arranged inside the air chamber, and a nozzle is arranged at one end of the several inclined tubes. The nozzle is placed at an angle and is in the shape of a flat nozzle.

[0013] The upper end of the air chamber is provided with a spiral flow channel leading to the interior thereof, and a plurality of vent holes are opened on the outer surface of the spiral flow channel, and the spiral flow channel is in a spiral shape.

[0014] The present invention also provides a method for using the optical fiber preform processing device, and the specific method for using is as follows: S1. The target rod core of the optical fiber preform is preferably installed at the lower end of the rotary elevator and placed in the deposition chamber. The target rod core needs to pass through the graphite heater, the mixed flow cavity mechanism, the reaction gas blowing mechanism and the blowtorch mechanism. When making the optical fiber preform, the rotary elevator drives the target rod core to rotate and gradually lift it upward, while the reaction gas blowing mechanism sprays the reaction gas. At the same time, the blowtorch mechanism sprays hydrogen and oxygen gas and ignites it. The reaction gas is heated by the hydrogen and oxygen flame to form a new Particles continue to accumulate in the target rod core; S2. The torch mechanism is arranged in a spiral stacking distribution, and the jet flow rate of the multiple torch mechanisms increases from high to low and is arranged in a conical spiral distribution. Because the rotating hoist drives the target rod core to rotate and gradually lift upward, the size and temperature of the hydrogen and oxygen flames sprayed by the torch mechanism at the bottom can quickly react with the reaction gas to generate The particles are accumulated on the target rod core. As the optical fiber preform is lifted, the flame size and temperature of the torch mechanism gradually decrease. Since the surface of the optical fiber preform formed by deposition is porous and the optical fiber preform formed by deposition is in an inverted cone shape when it is located inside the mixed flow cavity mechanism, it needs to pass through the torch mechanism to react with the reaction gas. The particles are continuously accumulated and filled on the porous surface of the optical fiber preform, producing a cylindrical optical fiber preform; The distance between the top torch mechanism and the central axis of the optical fiber preform is greater than the distance between the bottom torch mechanism and the central axis of the optical fiber preform. The diameter of the particles increases as they accumulate. As the optical fiber preform rotates and rises, the distance between the torch mechanism and the surface of the optical fiber preform can be ensured to be the same, making the generated The particles are effectively deposited on the surface of the optical fiber preform; S3. When the blowtorch mechanism sprays out the hydrogen-oxygen flame, the electromagnetic field generated by the mixed-flow cavity mechanism affects the vortex of the hydrogen-oxygen flame. When the flame is in the electromagnetic field, the charged particles in the flame, such as electrons and ions, will be affected by the Lorentz force, causing the internal fluid dynamics of the flame to change, thereby affecting the shape, stability and vortex pattern of the flame, thereby changing the combustion reaction path of the hydrogen-oxygen flame, increasing the concentration of free radicals, promoting combustion efficiency, and possibly redistributing the vortex in the flame. The hydrogen-oxygen flame is controlled by the mixed-flow cavity mechanism to change the generated The way particles are deposited on the optical fiber preform.

[0015] In summary, the technical effects and advantages of the present invention are as follows: 1. The burner mechanism of the present invention adopts a spiral stacking distribution design, so that the hydrogen-oxygen flame can cover a larger area, thereby increasing the chance of the reaction gas contacting the flame and promoting The effective generation of particles, and the jet flow rate of the blowtorch mechanism gradually decreases from the bottom to the top, forming a conical spiral distribution, ensuring that more heat and a larger flame are generated near the target rod core at the initial stage of deposition, which is conducive to the rapid start of the deposition process, and adjusting the flame size as the preform grows to adapt to the change in deposition rate and ensure uniform deposition throughout the process. Since the optical fiber preform formed by deposition presents an inverted cone shape inside the mixed flow cavity mechanism, by adjusting the position of the blowtorch mechanism and the flame intensity, The particles are more evenly accumulated on the surface of the preform rod, especially in the porous area, and finally a cylindrical optical fiber preform rod is produced. The high-temperature flame generated by the bottom blowtorch first acts on the core of the target rod. As the preform rod is lifted, the flame gradually becomes smaller and weaker. The temperature can be precisely controlled according to the needs of different stages to avoid local overheating or insufficient cooling, which is conducive to the formation of high-quality preform rods.

[0016] 2. In the present invention, since the top torch mechanism is far from the central axis of the optical fiber preform, while the bottom torch mechanism is close to the central axis, it can compensate for the change caused by the increase in the diameter of the preform during the deposition process, ensure that all torch mechanisms maintain the same distance from the preform surface, achieve more uniform particle deposition, and avoid the problem of excessive or insufficient deposition in local areas. Maintaining a constant distance from the torch to the preform surface means that the flame temperature and reaction gas concentration at each position are relatively stable, which is conducive to the generation of high-quality The particles are deposited on the preform surface and ensured to be effectively attached to the preform surface, reducing the occurrence of irregular deposition. If the distance between the torch and the preform surface changes over time without being controlled, it may lead to unstable deposition rate and irregular shape of the preform. By precisely adjusting the position of the torch, these deviations can be significantly reduced. In addition, the uniform and stable deposition process helps to reduce various defects that may appear inside and on the surface of the preform, such as bubbles and cracks, thereby improving the yield and performance consistency of the final product.

[0017] 3. In the present invention, the shape and size of the flame can be precisely controlled by applying an electromagnetic field. The electromagnetic field acts on charged particles such as electrons and ions in the flame, and uses the Lorentz force to change their motion trajectory, thereby affecting the overall structure of the flame, forming a more concentrated or diffuse flame shape to meet different deposition requirements. In some cases, the flame may become unstable due to external factors. The application of an electromagnetic field can help stabilize the flame, reduce irregular fluctuations, and ensure the consistency and repeatability of the entire deposition process. The electromagnetic field can change the combustion reaction path by increasing the concentration of free radicals, allowing hydrogen and oxygen to combine more effectively, generating more heat and active species. Higher combustion efficiency means that more energy can be used to decompose reaction gases such as , thus generating more Because the physical conditions inside the flame are optimized, the residence time and contact area of ​​the reaction gas in the high temperature area are increased, which promotes the occurrence of chemical reactions and improves The electromagnetic field can redistribute the eddy currents in the flame, making the mixing between the reaction gas and the flame more uniform. The uniform mixing helps to form a uniform surface on the entire preform. The optimized flame morphology and stable combustion conditions help reduce surface defects such as bubbles and cracks caused by excessively high or low local temperatures, thereby improving the overall quality and performance of the preform. For porous preforms that have already been formed, the flame under electromagnetic field control can better fill these pores and produce a denser and smoother preform surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a three-dimensional structural schematic diagram of an optical fiber preform processing device; Figure 2 It is a three-dimensional structural cross-sectional view of an optical fiber preform processing device; Figure 3 It is a cross-sectional view of the three-dimensional connection structure of the optical fiber preform processing device; Figure 4 It is a schematic diagram of a partial three-dimensional connection structure of an optical fiber preform processing device; Figure 5 It is a schematic diagram of the three-dimensional connection structure of the reaction gas injection mechanism and the mixed flow cavity mechanism; Figure 6 It is a schematic diagram of the three-dimensional connection structure of the blowtorch mechanism and the mixed flow cavity mechanism; Figure 7 It is a cross-sectional view of the three-dimensional connection structure of the mixed flow cavity mechanism; Figure 8 It is a cross-sectional view of the three-dimensional connection structure of the shell; Fig. 9 It is a cross-sectional view of the three-dimensional connection structure of the outer shell and the inner shell; Fig.10 This is the arrangement and assembly diagram of the blowtorch mechanism; Fig.11 It is a schematic diagram of the three-dimensional connection structure of the blowtorch mechanism; Fig.12It is a cross-sectional view of the three-dimensional connection structure of the blowtorch mechanism from a first-person perspective; Fig.13 A sectional view of the stereoscopic connection structure of the blowtorch mechanism from a second viewing angle; Fig.14 It is a schematic diagram of the three-dimensional connection structure of the reaction gas injection mechanism; Fig.15 It is a schematic diagram of the three-dimensional connection structure of the oblique tube and the nozzle; Fig.16 Schematic diagram of the three-dimensional connection structure of the spiral flow channel.

[0020] In the figure: 1. deposition chamber; 2. rotary lifting machine; 3. graphite heater; 4. mixed flow chamber mechanism; 41. outer shell; 42. mixed gas pipe; 43. magnetic winding coil; 44. thermal insulation hollow cylinder; 45. inner shell; 5. reaction gas blowing mechanism; 51. gas chamber; 52. inclined tube; 53. nozzle; 54. spiral flow channel; 55. vent; 6. blowtorch mechanism; 61. blowtorch shell; 62. vent pipe; 63. guide plate; 64. diverter plate; 65. through hole; 66. rib spacer. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1, Reference Figures 1 to 16 An optical fiber preform processing device shown in the figure comprises a deposition chamber 1, a rotary hoist 2 is arranged at the middle of the upper end of the deposition chamber 1, and an optical fiber preform is fixed at the bottom of the rotary hoist 2, a graphite heater 3 is arranged at the upper part of the inner wall of the deposition chamber 1, and a mixed flow cavity mechanism 4 for adjusting the vortex mode of the hydrogen-oxygen flame and controlling the reaction gas to mix and deposit on the surface of the target material is arranged on the inner wall of the deposition chamber 1 and below the graphite heater 3, and a plurality of blowtorch mechanisms 6 for spraying hydrogen-oxygen flames are arranged on the inner wall of the mixed flow cavity mechanism 4 in a spirally stacked distribution, and the jet flow rates of the plurality of blowtorch mechanisms 6 increase from high to low, and the blowtorch mechanisms 6 are distributed in a conical spiral, and the distance between the uppermost blowtorch mechanism 6 and the central axis of the optical fiber preform is greater than the distance between the lowermost blowtorch mechanism 6 and the central axis of the optical fiber preform; The bottom of the mixed flow chamber mechanism 4 is provided with a ring-shaped reaction gas ejection mechanism which cooperates with the burner mechanism 6 to control A reaction gas blowing mechanism 5 for depositing particles on the optical fiber preform.

[0023] It is worth noting that the target rod core of the optical fiber preform is preferably installed at the lower end of the rotary hoist 2 and placed in the deposition chamber 1. The target rod core needs to pass through the graphite heater 3, the mixed flow cavity mechanism 4, the reaction gas blowing mechanism 5 and the blowtorch mechanism 6. When making the optical fiber preform, the rotary hoist 2 drives the target rod core to rotate and gradually lift it upward, while the reaction gas blowing mechanism 5 sprays the reaction gas. At the same time, the blowtorch mechanism 6 sprays hydrogen and oxygen gas and ignites it. The reaction gas is heated by the hydrogen and oxygen flame to form a new Particles continue to accumulate in the target rod core; The torch mechanism 6 is arranged in a spiral stacking distribution, and the jet flow rate of the multiple torch mechanisms 6 increases from high to low and is arranged in a conical spiral distribution. Because the rotating hoist 2 drives the target rod core to rotate and gradually lift upward, the size and temperature of the hydrogen and oxygen flames sprayed by the torch mechanism 6 at the bottom can quickly react with the reaction gas to generate The particles are accumulated on the target rod core. As the optical fiber preform is lifted, the flame size and temperature of the torch mechanism 6 gradually decrease. Since the surface of the optical fiber preform formed by deposition is porous and the optical fiber preform formed by deposition is in an inverted cone shape when located inside the mixed flow cavity mechanism 4, it needs to pass through the torch mechanism 6 to react with the reaction gas to The particles are continuously accumulated and filled on the porous surface of the optical fiber preform, producing a cylindrical optical fiber preform; The blowtorch mechanism 6 adopts a spiral stacking distribution design, so that the hydrogen-oxygen flame can cover a larger area, thereby increasing the chance of the reaction gas contacting the flame and promoting The particles are effectively generated, and the jet flow rate of the blowtorch mechanism gradually decreases from the bottom to the top, forming a conical spiral distribution, ensuring that more heat and a larger flame are generated near the target rod core at the initial stage of deposition, which is conducive to the rapid start of the deposition process. The flame size is adjusted as the preform grows to adapt to the change in deposition rate and ensure uniformity of deposition throughout the process.

[0024] Since the optical fiber preform formed by deposition presents an inverted cone shape inside the mixed flow cavity mechanism 4, by adjusting the position and flame intensity of the blowtorch mechanism 6, The particles are more evenly accumulated on the surface of the preform rod, especially in the porous area, and finally a cylindrical optical fiber preform rod is produced. The high-temperature flame generated by the bottom blowtorch first acts on the core of the target rod. As the preform rod is lifted, the flame gradually becomes smaller and weaker. The temperature can be precisely controlled according to the needs of different stages to avoid local overheating or insufficient cooling, which is conducive to the formation of high-quality preform rods.

[0025] The distance between the top torch mechanism 6 and the central axis of the optical fiber preform is greater than the distance between the bottom torch mechanism 6 and the central axis of the optical fiber preform. The diameter of the particles increases as they accumulate. As the optical fiber preform rotates and rises, the distance between the torch mechanism 6 and the surface of the optical fiber preform can be ensured to be the same, so that the generated The particles are effectively deposited on the surface of the optical fiber preform; Among them, since the top blowtorch mechanism is far away from the central axis of the optical fiber preform, while the bottom blowtorch mechanism is close to the central axis, it can compensate for the changes caused by the increase in the diameter of the preform during the deposition process, ensuring that all blowtorch mechanisms 6 maintain the same distance from the surface of the preform, achieving more uniform particle deposition, and avoiding the problem of excessive or insufficient deposition in local areas.

[0026] Maintaining a constant distance from the torch to the preform surface means that the flame temperature and reaction gas concentration at each position are relatively stable, which is conducive to the production of high-quality particles and ensure that they can effectively adhere to the surface of the preform to reduce the occurrence of irregular deposition.

[0027] If the distance between the blowtorch and the preform surface changes over time without being controlled, it may lead to unstable deposition rate and irregular preform shape. By precisely adjusting the position of the blowtorch, these deviations can be significantly reduced. In addition, the uniform and stable deposition process helps to reduce various defects that may appear inside and on the surface of the preform, such as bubbles and cracks, thereby improving the yield and performance consistency of the final product.

[0028] When the blowtorch mechanism 6 sprays out the hydrogen-oxygen flame, the mixed-flow cavity mechanism 4 generates an electromagnetic field that affects the vortex of the hydrogen-oxygen flame. When the flame is in the electromagnetic field, the charged particles in the flame, such as electrons and ions, are affected by the Lorentz force, which causes the internal fluid dynamics of the flame to change, thereby affecting the shape, stability and vortex pattern of the flame, thereby changing the combustion reaction path of the hydrogen-oxygen flame, increasing the concentration of free radicals, promoting combustion efficiency, and possibly redistributing the vortex in the flame. The mixed-flow cavity mechanism 4 controls the hydrogen-oxygen flame to change the generated The way particles are deposited on the optical fiber preform.

[0029] Among them, by applying an electromagnetic field, the shape and size of the flame can be precisely controlled. The electromagnetic field acts on charged particles in the flame, such as electrons and ions, and uses the Lorentz force to change their motion trajectories, thereby affecting the overall structure of the flame and forming a more concentrated or diffuse flame shape to meet different deposition requirements.

[0030] In some cases, the flame may be affected by external factors and become unstable. The application of electromagnetic fields can help stabilize the flame, reduce irregular fluctuations, and ensure consistency and repeatability throughout the deposition process. Electromagnetic fields can change the combustion reaction path by increasing the concentration of free radicals, allowing hydrogen and oxygen to combine more effectively, generating more heat and active species. Higher combustion efficiency means more energy is available to decompose the reaction gases such as , thus generating more Particles.

[0031] As the physical conditions inside the flame are optimized, the residence time and contact area of ​​the reaction gas in the high temperature area are increased, which promotes the occurrence of chemical reactions and improves The electromagnetic field can redistribute the eddy currents in the flame, making the mixing between the reaction gas and the flame more uniform. The uniform mixing helps to form a uniform surface on the entire preform. layer, reducing the problem of local deposition being too thick or too thin.

[0032] The optimized flame morphology and stable combustion conditions help reduce surface defects such as bubbles and cracks caused by local temperatures that are too high or too low, thereby improving the overall quality and performance of the preform. For porous preforms that have already been formed, the flame under electromagnetic field control can better fill these pores and produce a denser and smoother preform surface.

[0033] Embodiment 2: Based on the blowtorch mechanism 6 proposed in Embodiment 1, this embodiment provides a further technical solution of the blowtorch mechanism 6.

[0034] The blowtorch mechanism 6 includes a blowtorch shell 61, the gas outlet of the blowtorch shell 61 is a gradually narrowing and widening outlet for accelerating the ejection of hydrogen and oxygen gases. A ventilation pipe 62 is provided on one side of the outer surface of the blowtorch shell 61, and the ventilation pipe 62 passes through the inner shell 45 and the heat-insulating hollow cylinder 44 and communicates with the interior of the mixed gas pipe 42.

[0035] A diverter plate 64 for uniformly controlling the discharge of hydrogen and oxygen gases is arranged inside the blowtorch housing 61, and a plurality of through holes 65 distributed in a rectangular array are provided on the outer surface of the diverter plate 64. A plurality of rib partitions 66 distributed at equal intervals and used to guide the gas into the through holes 65 are arranged on one side of the diverter plate 64, and the rib partitions 66 are located on the side away from the guide plate 63.

[0036] It is worth noting that when in use, hydrogen and oxygen gas is sprayed into the interior of the blowtorch housing 61 through the vent pipe 62 . After entering the interior of the blowtorch housing 61 , the gas is guided by the rib spacer 66 through the through hole 65 , so that the gas can pass through the through hole 65 evenly.

[0037] A plurality of guide vanes 63 are arranged inside the burner housing 61 and are distributed at equal intervals to control the flow direction of hydrogen and oxygen gases. The guide vanes 63 are in the shape of flat water drops.

[0038] Among them, when the hydrogen and oxygen gases pass through the through hole 65, they will be guided by the guide plate 63. Because the guide plate 63 is set in a flat water drop shape and the gas outlet of the blowtorch shell 61 is a gradually narrowing and widening outlet, the hydrogen and oxygen gases are accelerated to be ejected and the flame injection and combustion distance can be increased.

[0039] The gas outlet of the blowtorch housing 61 is designed to be gradually narrowed and widened, similar to the Venturi effect, so that the gas speed increases when passing through, which not only improves the gas injection speed, but also enhances the penetration of the flame, allowing the flame to maintain a high temperature at a greater distance.

[0040] The guide plate 63, which is configured in a flat water drop shape, further guides the gas flow direction, ensuring that the gas is ejected from the nozzle at an optimized angle and speed, forming a more concentrated and stable flame shape, which is beneficial to the effective contact and full reaction between the reaction gas and the flame.

[0041] Since the gas is ejected faster and the nozzle design increases the flame injection and combustion distance, the flame can maintain a high temperature in a larger area, which is beneficial to promoting Decomposition of reaction gases and Particle generation is highly beneficial and helps improve overall combustion efficiency, while uniform gas distribution combined with optimized injection angles and velocities create a more stable and controllable flame structure.

[0042] Since the flame temperature distribution is more uniform, the reaction gas can be fully heated in a larger range and participate in the chemical reaction, thus forming a more uniform surface on the target rod core. The deposition layer reduces defects caused by uneven local deposition, such as thickness differences and bubbles, and improves the quality of the preform. For the porous preform that has been formed, under the optimized flame conditions, The particles can fill these pores more effectively, producing a denser and smoother preform surface that meets the requirements of the subsequent wire drawing process.

[0043] Embodiment 3: Based on the mixed flow cavity mechanism 4 proposed in Embodiment 1, this embodiment provides a further technical solution of the mixed flow cavity mechanism 4.

[0044] The mixed flow chamber mechanism 4 includes an outer shell 41, which is fixedly mounted on the inner wall of the deposition chamber 1 and is located below the graphite heater 3. The bottom wall of the outer shell 41 is provided with an inner shell 45. The inner shell 45 and the outer shell 41 are combined to form a sealed cavity, and a plurality of mixed gas tubes 42 distributed in a circular array are provided inside the cavity. The mixed gas tubes 42 are attached to the inner wall of the outer shell 41.

[0045] An insulating hollow cylinder 44 is provided at the upper end of the inner shell 45. The interior of the combined cavity of the outer shell 41 and the inner shell 45 is filled with an inert insulating gas and communicates with an external circulating gas pipe of the deposition chamber 1 for thermal insulation.

[0046] It is worth mentioning that a heat-insulating and flame-resistant gas is arranged inside the cavity formed by the outer shell 41 and the inner shell 45, which can prevent high temperature from affecting the normal operation of the magnetic winding coil 43, and the hydrogen and oxygen gas inside the ventilation pipe 62 extends to the inside of the mixed gas pipe 42. The mixed gas pipe 42 is used to mix the hydrogen and oxygen gases, and each mixed gas pipe 42 is separately connected to the airflow pipe outside the deposition chamber 1.

[0047] A magnetic coil 43 for generating an electromagnetic field and thus affecting the shape of a flame is disposed in the combined cavity of the outer shell 41 and the inner shell 45 . The magnetic coil 43 is located in the cavity between the thermal insulation hollow cylinder 44 and the outer shell 41 .

[0048] Among them, the electromagnetic field generated by the magnetic winding coil 43 affects the vortex of the hydrogen-oxygen flame. When the flame is in the electromagnetic field, the charged particles in the flame, such as electrons and ions, will be affected by the Lorentz force, causing the internal fluid dynamics of the flame to change, thereby affecting the shape, stability and vortex pattern of the flame, thereby changing the combustion reaction path of the hydrogen-oxygen flame, increasing the concentration of free radicals, promoting combustion efficiency, and possibly redistributing the vortex in the flame. The hydrogen-oxygen flame is controlled by the magnetic winding coil 43 to change the generated The particles are deposited on the optical fiber preform rod, and the magnetic winding coil 43 can be set as a transverse winding coil or a longitudinal winding coil.

[0049] Among them, a heat-insulating and flame-resistant gas is set inside the cavity formed by the outer shell 41 and the inner shell 45, which can effectively prevent the influence of high temperature on the magnetic winding coil 43, not only extending the service life of the magnetic winding coil, but also ensuring that it can work stably in a high temperature environment and provide a continuous and uniform electromagnetic field.

[0050] When the hydrogen-oxygen flame is in the electromagnetic field generated by the magnetically wound coil 43, the charged particles in the flame, such as electrons and ions, are affected by the Lorentz force, causing the fluid dynamic properties inside the flame to change. The shape, stability and vortex pattern of the flame can be adjusted to make it more concentrated or diffuse to meet different deposition requirements.

[0051] Electromagnetic fields can change the combustion reaction path by increasing the concentration of free radicals, making hydrogen and oxygen combine more effectively, generating more heat and active species, and higher combustion efficiency for decomposing reaction gases such as , thus generating more Particles.

[0052] The electromagnetic field redistributes the eddy currents within the flame, resulting in a more uniform mixing of the reactant gas and the flame. This uniform mixing helps to form a uniform layer, reducing the problem of local deposition being too thick or too thin.

[0053] The magnetic winding coil 43 can be set as a horizontal winding or a vertical winding as needed, which is suitable for the magnetic field control requirements in different directions. For example, the horizontal winding is more suitable for adjusting the width and expansion angle of the flame, while the vertical winding is conducive to controlling the height and length of the flame. Each mixed gas tube 42 is separately connected to the gas flow tube outside the deposition chamber 1 to ensure that the hydrogen and oxygen gas ratio in each mixed gas tube is accurately controllable, which helps to maintain the consistency of the working state of each blowtorch mechanism 6 and avoid deposition deviation caused by uneven gas flow.

[0054] Embodiment 4: Based on the reaction gas blowing mechanism 5 provided in Embodiment 1, this embodiment provides a further technical solution of the reaction gas blowing mechanism 5.

[0055] The reaction gas blowing mechanism 5 includes an air chamber 51, which is fixedly mounted on the inner wall of the deposition chamber 1. A plurality of inclined tubes 52 distributed in a circular array are arranged inside the air chamber 51. A nozzle 53 is arranged at one end of each of the inclined tubes 52. The nozzle 53 is tilted and is in the shape of a flat nozzle.

[0056] It is worth noting that the reaction gas enters the interior of the inclined tube 52 and then is ejected through the nozzle 53, and the inclined tube 52 is arranged in a circular array, and the plurality of nozzles 53 are arranged to eject the reaction gas in a vortex state and catalytically generate hydrogen and oxygen flames. The particles are formed by the burner mechanism 6 which is arranged in a spiral layered manner and can be formed by cooperating with the burner mechanism 6. The particles are evenly stacked on the optical fiber preform.

[0057] The upper end of the air chamber 51 is provided with a spiral flow channel 54 leading to the interior thereof. The outer surface of the spiral flow channel 54 is provided with a plurality of vent holes 55 . The spiral flow channel 54 is in a spiral shape.

[0058] The spiral flow channel 54 is in a spiral shape, and the winding vents 55 of the spiral flow channel 54 are all located below the blowtorch housing 61 . When the reaction gas is ejected through the vents 55 , it can quickly react with the hydrogen-oxygen flame.

[0059] The inclined tubes 52 are distributed in a circular array, and the multiple nozzles 53 are arranged at a specific angle, so that the reaction gas forms a vortex state when it is ejected. The vortex flow helps to increase the contact area between the reaction gas and the hydrogen-oxygen flame, promote a more efficient chemical reaction, and thus generate more Since the reaction gas is directly ejected into the hydrogen-oxygen flame through the vent hole 55, the time from the ejection of the reaction gas to the participation in the reaction is shortened, ensuring that the reaction gas can be quickly decomposed in the high temperature area and participate in the chemical reaction.

[0060] The design of the spiral flow channel 54 allows the reaction gas to pass through a spiral path before entering the burner housing 61, further enhancing the mixing uniformity of the gas, ensuring that the reaction gas is evenly distributed in the entire flame area, and avoiding problems such as insufficient reaction or overheating in local areas.

[0061] Since the burner mechanism 6 is arranged in a spiral stack, and the plurality of nozzles 53 are distributed to spray the reaction gas in a vortex state, the generated The particles are evenly stacked on the surface of the optical fiber preform, reducing defects caused by local uneven deposition, such as thickness differences, bubbles, etc., and improving the quality of the preform. The blowtorch mechanism 6 is distributed in a spiral stack, and the flame characteristics and position can be flexibly adjusted according to the actual deposition situation, which is suitable for manufacturing preforms of different diameters and lengths.

[0062] The present invention also provides a method for using the optical fiber preform processing device, and the specific method for using is as follows: S1. The target rod core of the optical fiber preform is preferably installed at the lower end of the rotary hoist 2 and placed in the deposition chamber 1. The target rod core needs to pass through the graphite heater 3, the mixed flow cavity mechanism 4, the reaction gas blowing mechanism 5 and the blowtorch mechanism 6. When making the optical fiber preform, the rotary hoist 2 drives the target rod core to rotate and gradually lift it upward, while the reaction gas blowing mechanism 5 sprays the reaction gas. At the same time, the blowtorch mechanism 6 sprays hydrogen and oxygen gas and ignites it. The reaction gas is heated by the hydrogen and oxygen flame to form a new Particles continue to accumulate in the target rod core; S2, the torch mechanism 6 is arranged in a spiral stacking distribution, and the jet flow rate of the multiple torch mechanisms 6 increases from high to low and is distributed in a conical spiral. Because the rotating hoist 2 drives the target rod core to rotate and gradually lift upward, the size and temperature of the hydrogen and oxygen flames sprayed by the torch mechanism 6 at the bottom can quickly react with the reaction gas to generate The particles are accumulated on the target rod core. As the optical fiber preform is lifted, the flame size and temperature of the torch mechanism 6 gradually decrease. Since the surface of the optical fiber preform formed by deposition is porous and the optical fiber preform formed by deposition is in an inverted cone shape when located inside the mixed flow cavity mechanism 4, it needs to pass through the torch mechanism 6 to react with the reaction gas to The particles are continuously accumulated and filled on the porous surface of the optical fiber preform, producing a cylindrical optical fiber preform; The distance between the top torch mechanism 6 and the central axis of the optical fiber preform is greater than the distance between the bottom torch mechanism 6 and the central axis of the optical fiber preform. The diameter of the particles increases as they accumulate. As the optical fiber preform rotates and rises, the distance between the torch mechanism 6 and the surface of the optical fiber preform can be ensured to be the same, so that the generated The particles are effectively deposited on the surface of the optical fiber preform; S3. When the blowtorch mechanism 6 sprays out the hydrogen-oxygen flame, the mixed-flow cavity mechanism 4 generates an electromagnetic field that affects the vortex of the hydrogen-oxygen flame. When the flame is in the electromagnetic field, the charged particles in the flame, such as electrons and ions, are affected by the Lorentz force, which causes the internal fluid dynamics of the flame to change, thereby affecting the shape, stability and vortex pattern of the flame, thereby changing the combustion reaction path of the hydrogen-oxygen flame, increasing the concentration of free radicals, promoting combustion efficiency, and possibly redistributing the vortex in the flame. The mixed-flow cavity mechanism 4 controls the hydrogen-oxygen flame to change the generated The way particles are deposited on the optical fiber preform.

[0063] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical fiber preform processing device, comprising a deposition chamber (1), a rotary elevator (2) is arranged in the middle of the upper end of the deposition chamber (1), and an optical fiber preform is fixed at the bottom of the rotary elevator (2), characterized in that: A graphite heater (3) is arranged on the upper part of the inner wall of the deposition chamber (1); a mixed flow cavity mechanism (4) for regulating the vortex pattern of the hydrogen-oxygen flame and controlling the reaction gas to mix and deposit on the target surface is arranged on the inner wall of the deposition chamber (1) and below the graphite heater (3); a plurality of blowtorch mechanisms (6) for spraying the hydrogen-oxygen flame are arranged on the inner wall of the mixed flow cavity mechanism (4) in a spirally stacked arrangement; the jet flow rates of the plurality of blowtorch mechanisms (6) increase from high to low, and the blowtorch mechanisms (6) are arranged in a conical spiral arrangement; the distance between the top blowtorch mechanism (6) and the central axis of the optical fiber preform is greater than the distance between the bottom blowtorch mechanism (6) and the central axis of the optical fiber preform; The bottom of the mixed flow chamber mechanism (4) is provided with a ring-shaped reaction gas ejection mechanism that cooperates with the blowtorch mechanism (6) to control A reaction gas blowing mechanism (5) for depositing particles on an optical fiber preform.

2. The optical fiber preform processing device according to claim 1, characterized in that: The mixed flow chamber mechanism (4) comprises an outer shell (41), the outer shell (41) being fixedly mounted on the inner wall of the deposition chamber (1) and located below the graphite heater (3), the bottom wall of the outer shell (41) being provided with an inner shell (45), the inner shell (45) and the outer shell (41) being combined to form a sealed cavity, and a plurality of mixed gas tubes (42) distributed in a ring array being provided inside the cavity, the mixed gas tubes (42) being attached to the inner wall of the outer shell (41).

3. The optical fiber preform processing device according to claim 2, characterized in that: The upper end of the inner shell (45) is provided with a temperature-insulating hollow cylinder (44); the interior of the combined cavity of the outer shell (41) and the inner shell (45) is filled with an inert heat-insulating gas and is connected to an external circulating gas pipe of the deposition chamber (1) for heat insulation.

4. The optical fiber preform processing device according to claim 3, characterized in that: A magnetic coil (43) for generating an electromagnetic field and thus affecting the shape of a flame is arranged in the combined cavity of the outer shell (41) and the inner shell (45); the magnetic coil (43) is located in the cavity between the thermal insulation hollow cylinder (44) and the outer shell (41).

5. The optical fiber preform processing device according to claim 1, characterized in that: The blowtorch mechanism (6) comprises a blowtorch housing (61), wherein a plurality of guide vanes (63) are arranged inside the blowtorch housing (61) and are distributed at equal intervals for controlling the flow direction of hydrogen and oxygen gases. The guide vanes (63) are in the shape of flat water drops.

6. The optical fiber preform processing device according to claim 5, characterized in that: A flow divider (64) for uniformly controlling the discharge of hydrogen and oxygen gases is arranged inside the blowtorch housing (61); a plurality of through holes (65) distributed in a rectangular array are provided on the outer surface of the flow divider (64); a plurality of rib spacers (66) distributed at equal intervals and used for guiding the gas to enter the through holes (65) are arranged on one side of the flow divider (64); and the rib spacers (66) are located on a side away from the guide plate (63).

7. The optical fiber preform processing device according to claim 6, characterized in that: The gas outlet of the burner shell (61) is a gradually narrowing and widening outlet for accelerating the discharge of hydrogen and oxygen gases. A ventilation pipe (62) is provided on one side of the outer surface of the burner shell (61). The ventilation pipe (62) passes through the inner shell (45) and the temperature-insulating hollow cylinder (44) and communicates with the interior of the mixed gas pipe (42).

8. The optical fiber preform processing device according to claim 1, characterized in that: The reaction gas injection mechanism (5) comprises an air chamber (51), wherein the air chamber (51) is fixedly mounted on the inner wall of the deposition chamber (1), wherein a plurality of inclined tubes (52) distributed in a ring array are arranged inside the air chamber (51), and a nozzle (53) is arranged at one end of each of the inclined tubes (52), wherein the nozzle (53) is tilted and is in the shape of a flat nozzle.

9. The optical fiber preform processing device according to claim 8, characterized in that: The upper end of the air chamber (51) is provided with a spiral flow channel (54) leading to the interior thereof, and the outer surface of the spiral flow channel (54) is provided with a plurality of vent holes (55), and the spiral flow channel (54) is in a spiral shape.

10. A method for using the optical fiber preform processing device according to any one of claims 1 to 9, characterized in that: The specific usage is as follows: First, the target rod core of the optical fiber preform is first installed at the lower end of the rotary elevator (2) and placed in the deposition chamber (1). The target rod core needs to pass through the graphite heater (3), the mixed flow chamber mechanism (4), the reaction gas blowing mechanism (5) and the blowtorch mechanism (6). When making the optical fiber preform, the rotary elevator (2) drives the target rod core to rotate and gradually lift it upward, while the reaction gas blowing mechanism (5) sprays the reaction gas. At the same time, the blowtorch mechanism (6) sprays the hydrogen and oxygen gas and ignites it. The reaction gas is heated by the hydrogen and oxygen flame to form a new The particles are continuously accumulated in the core of the target rod and then heated by a graphite heater (3) to form an optical fiber preform.

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