An optical fiber preform processing device and method thereof

Abstract

The present invention discloses an optical fiber preform processing device and method, which relates to the technical field of optical fiber preform processing. The device includes a deposition chamber. In the middle of the upper end of the deposition chamber, a rotary hoist is provided, and an optical fiber preform is fixed to the bottom of the rotary hoist. An upper part of the inner wall of the deposition chamber is provided with a graphite heater. The burner mechanism provided in the present invention adopts a design of spiral laminated distribution, so that the hydrogen-oxygen flame can cover a larger area, thereby increasing the chance of contact between the reaction gas and the flame and promoting the effective generation of particles. The gas jet flow rate of the burner 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 beneficial to quickly starting the deposition process, and adjusting the flame size as the preform grows to adapt to the change of the deposition rate and ensure the uniformity of deposition throughout the process.

Description

Technical Field

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

[0002] For example, the publication number is CN106219961A, and the name is a device and method for preparing an optical fiber preform by VAD. The device includes a vertical frame, on which a lifting chuck is installed. The lifting chuck is connected to a cantilever frame, and a rotating boom is installed at the front end of the cantilever frame. A reaction cavity for deposition is installed correspondingly below the rotating boom. A core layer burner and a cladding burner are respectively arranged in the reaction cavity. A laser rangefinder is installed outside the reaction cavity, and the ranging point of the laser rangefinder corresponds to the formation position of the preform core layer above the core layer burner, and is used to detect the diameter of the preform core layer. 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 diameter of the core layer of the deposited preform, make the core diameter of the produced optical fiber preform uniform, and thus improve the processing quality of the preform.

[0003] However, the above burner design often makes it difficult to achieve large-area flame coverage, resulting in insufficient contact between the reaction gas and the flame, affecting the generation efficiency and uniformity of particles. Moreover, during the deposition process, as the particles continuously accumulate, the diameter of the preform gradually increases, resulting in a change in the distance between the burner mechanism and the surface of the preform, thereby affecting the deposition uniformity. Moreover, the reaction gas and the flame generate 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 a method thereof to meet the requirements. Summary of the Invention

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

[0005] To achieve the above purpose, the present application provides the following technical solution: An optical fiber preform processing device includes a deposition chamber. A rotary elevator is arranged in the middle of the upper end of the deposition chamber, and an optical fiber preform is fixed to the bottom of the rotary elevator. A graphite heater is arranged on the upper part of the inner wall of the deposition chamber. A mixed-flow cavity mechanism for regulating the eddy current mode of the hydrogen-oxygen flame, controlling the mixing of the reaction gas and depositing it on the surface of the target material is arranged below the graphite heater on the inner wall of the deposition chamber. A plurality of burner mechanisms for ejecting hydrogen-oxygen flames are arranged on the inner wall of the mixed-flow cavity mechanism in a spiral laminated distribution. The jet gas flow rates of the plurality of burner mechanisms increase sequentially from high to low, and the burner mechanisms are distributed in a conical spiral. The distance from the burner mechanism at the uppermost part to the central axis of the optical fiber preform is greater than the distance from the burner mechanism at the bottommost part to the central axis of the optical fiber preform;

[0006] At the bottom of the mixed-flow cavity mechanism, there is an annular reaction gas ejection mechanism that cooperates with the blowtorch mechanism to control the reaction gas blowing mechanism for depositing particles on the optical fiber preform.

[0007] Among them, the mixed-flow cavity mechanism includes a housing, the housing is fixedly installed on the inner wall of the deposition chamber and is located below the graphite heater, the bottom wall of the housing is provided with an inner housing, the inner housing and the housing are combined to form a sealed cavity, and a plurality of mixed gas pipes distributed in an annular array are arranged inside the cavity, and the mixed gas pipes are attached to the inner wall of the housing.

[0008] Among them, a heat-insulating hollow cylinder is arranged at the upper end of the inner housing, and the cavity formed by the combination of the outer housing and the inner housing is filled with an inert heat-insulating gas, which is communicated with the external circulation gas pipe of the deposition chamber for heat insulation.

[0009] Among them, a magnetic winding coil for generating an electromagnetic field to affect the shape of the flame is arranged in the cavity formed by the combination of the outer housing and the inner housing, and the magnetic winding coil is located at the cavity position between the heat-insulating hollow cylinder and the outer housing.

[0010] Among them, the blowtorch mechanism includes a blowtorch housing, and a plurality of flow guiding sheets for controlling the flow direction of hydrogen-oxygen gas are arranged inside the blowtorch housing at equal intervals, and the flow guiding sheets are in the shape of flat water droplets.

[0011] Among them, a shunt sheet for uniformly controlling the discharge of hydrogen-oxygen gas is arranged inside the blowtorch housing, a plurality of through holes distributed in a rectangular array are formed on the outer surface of the shunt sheet, and a plurality of rib partitions for guiding gas into the through holes are arranged on one side of the shunt sheet at equal intervals, and the rib partitions are located on the side far from the flow guiding sheet.

[0012] Among them, the gas ejection port of the blowtorch housing is a gradually narrowing and widening nozzle for accelerating the ejection of hydrogen-oxygen gas, and a ventilation pipe is arranged on one side of the outer surface of the blowtorch housing, and the ventilation pipe penetrates through the inner housing and the heat-insulating hollow cylinder and is communicated with the inside of the mixed gas pipe.

[0013] Among them, the reaction gas blowing mechanism includes a gas chamber, the gas chamber is fixedly installed on the inner wall of the deposition chamber, a plurality of inclined pipes distributed in an annular array are arranged inside the gas chamber, one ends of the plurality of inclined pipes are all provided with nozzles, the nozzles are inclined, and the nozzles are in the shape of flat nozzles.

[0014] Among them, a spiral flow channel communicating with the inside of the gas chamber is arranged at the upper end of the gas chamber, a plurality of ventilation holes are formed on the outer surface of the spiral flow channel, and the spiral flow channel is in a spiral shape.

[0015] The present invention also provides a method for using a fiber preform processing device, and the specific usage method is as follows:

[0016] S1. First, the target rod core of the fiber preform is installed at the lower end of the rotary elevator and placed into the deposition chamber. The target rod core needs to penetrate through the graphite heater, the mixed-flow cavity mechanism, the reaction gas injection mechanism, and the blowtorch mechanism. When manufacturing the fiber preform, the rotary elevator drives the target rod core to rotate and gradually lift upward. At the same time, the reaction gas injection mechanism injects reaction gas, and the blowtorch mechanism injects hydrogen-oxygen gas and ignites it. The reaction gas is heated by the hydrogen-oxygen flame, and the newly generated particles continuously accumulate on the target rod core;

[0017] S2. The set blowtorch mechanisms are arranged in a spiral laminated distribution, and the jet gas flow rates of the multiple set blowtorch mechanisms increase sequentially from high to low and are distributed in a conical spiral. Since the rotary elevator drives the target rod core to rotate and gradually lift upward, the size and temperature of the hydrogen-oxygen flame ejected by the blowtorch mechanism at the bottom can quickly react with the reaction gas to generate particles that accumulate on the target rod core. As the fiber preform is lifted, the size and temperature of the flame ejected by the blowtorch mechanism gradually decrease. Since the surface of the fiber preform formed by deposition is porous, and the fiber preform formed by deposition is in an inverted cone shape when it is inside the mixed-flow cavity mechanism, it is necessary to react the blowtorch mechanism with the reaction gas to continuously accumulate particles to fill the porous surface of the fiber preform, and a cylindrical fiber preform is produced;

[0018] The distance between the blowtorch mechanism at the uppermost part and the central axis of the fiber preform is greater than the distance between the blowtorch mechanism at the bottommost part and the central axis of the fiber preform. Then, due to the continuous accumulation of particles, the diameter of the target rod core of the fiber preform becomes larger. As the fiber preform rotates and rises, it can ensure that the distance between the blowtorch mechanism and the surface of the fiber preform is the same, so that the generated particles can be effectively accumulated on the surface of the fiber preform;

[0019] S3. When the blowtorch mechanism ejects the hydrogen-oxygen flame, the mixed-flow cavity mechanism generates an electromagnetic field to affect the hydrogen-oxygen flame vortex. When the flame is in the electromagnetic field, since the charged particles in the flame, such as electrons and ions, will be affected by the Lorentz force, the hydrodynamic properties inside the flame will change, thereby affecting the shape, stability, and vortex mode of the flame, and then changing the combustion reaction path of the hydrogen-oxygen flame, increasing the free radical concentration, promoting the combustion efficiency, and possibly redistributing the vortices inside the flame. By controlling the hydrogen-oxygen flame through the mixed-flow cavity mechanism, the way of particles accumulating on the fiber preform is changed.

[0020] In summary, the technical effects and advantages of the present invention are as follows:

[0021] 1. The blowtorch mechanism provided by the present invention adopts a design of spiral laminated distribution, enabling the hydrogen-oxygen flame to cover a larger area, thereby increasing the chance of contact between the reaction gas and the flame, and promoting the effective generation of particles. The gas 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 core of the target rod at the initial stage of deposition, which is beneficial to quickly initiate the deposition process, and adjusting the flame size as the preform grows to adapt to the change of the deposition rate, ensuring the uniformity of deposition throughout the process. Since the fiber preform formed by deposition presents an inverted cone shape inside the mixed-flow cavity mechanism, by adjusting the position and flame intensity of the blowtorch mechanism, the particles can be more evenly deposited on the surface of the preform, especially filling the porous area, and finally producing a cylindrical fiber preform. The high-temperature large flame generated by the bottom blowtorch first acts on the core of the target rod. As the preform is lifted, the flame gradually becomes smaller and weaker. The temperature can be precisely controlled according to the requirements of different stages, avoiding problems such as local overheating or insufficient cooling, which is beneficial to forming a high-quality preform.

[0022] 2. In the present invention, since the blowtorch mechanism at the top is far from the central axis of the fiber preform, while the blowtorch mechanism at the bottom 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, ensuring that all blowtorch mechanisms 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. Maintaining a constant distance from the blowtorch to the surface of the preform means that the flame temperature and reaction gas concentration at each position are relatively stable, which is beneficial to generating high-quality particles and ensuring that they can effectively adhere to the surface of the preform, reducing the occurrence of irregular deposition phenomena. If the distance between the blowtorch and the surface of the preform changes over time without control, it may lead to problems such as unstable deposition rate and irregular shape of the preform. By precisely adjusting the position of the blowtorch, these deviations can be significantly reduced, and 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, cracks, etc., thereby improving the yield and performance consistency of the final product.

[0023] 3. In the present invention, by applying an electromagnetic field, the shape and size of the flame can be precisely controlled. The electromagnetic field acts on charged particles such as electrons and ions in the flame, and uses the Lorentz force to change their movement trajectories, thereby affecting the overall structure of the flame and forming a more concentrated or diffused flame shape to adapt to different deposition requirements. In some cases, the flame may become unstable due to external factors. Applying 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 radical concentration, enabling hydrogen and oxygen to combine more effectively, generating more heat and active species. Higher combustion efficiency means more energy is available for decomposing reaction gases such as , and then generating more particles. Since the physical conditions inside the flame are optimized, the residence time and contact area of the reaction gases in the high-temperature region increase, promoting chemical reactions and increasing the generation rate of particles. Moreover, the electromagnetic field can redistribute the vortices in the flame, making the mixing between the reaction gases and the flame more uniform. Uniform mixing helps form a consistent layer on the entire preform surface, reducing the problem of over-thick or over-thin local deposition. The optimized flame shape and stable combustion conditions help reduce surface defects such as bubbles and cracks caused by local overheating or overcooling, thereby improving the overall quality and performance of the preform. For the already formed porous preform, the flame under the control of the electromagnetic field can better fill these pores, producing a denser and smoother preform surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 FIG. is a three-dimensional structural schematic diagram of an optical fiber preform processing device;

[0026] Figure 2 FIG. is a three-dimensional structural sectional view of an optical fiber preform processing device;

[0027] Figure 3 FIG. is a three-dimensional connection structural sectional view of an optical fiber preform processing device;

[0028] Figure 4 FIG. is a partial three-dimensional connection structural schematic diagram of an optical fiber preform processing device;

[0029] Figure 5 Schematic diagram of the three-dimensional connection structure of the reaction gas injection mechanism and the mixed-flow cavity mechanism;

[0030] Figure 6 Schematic diagram of the three-dimensional connection structure of the blowtorch mechanism and the mixed-flow cavity mechanism;

[0031] Figure 7 Cross-sectional view of the three-dimensional connection structure of the mixed-flow cavity mechanism;

[0032] Figure 8 Cross-sectional view of the three-dimensional connection structure of the outer shell;

[0033] Figure 9 Cross-sectional view of the three-dimensional connection structure of the outer shell and the inner shell;

[0034] Figure 10 Arrangement and assembly diagram of the blowtorch mechanism;

[0035] Figure 11 Schematic diagram of the three-dimensional connection structure of the blowtorch mechanism;

[0036] Figure 12 Cross-sectional view of the three-dimensional connection structure of the blowtorch mechanism from the first perspective;

[0037] Figure 13 Cross-sectional view of the three-dimensional connection structure of the blowtorch mechanism from the second perspective;

[0038] Figure 14 Schematic diagram of the three-dimensional connection structure of the reaction gas injection mechanism;

[0039] Figure 15 Schematic diagram of the three-dimensional connection structure of the inclined tube and the nozzle;

[0040] Figure 16 Schematic diagram of the three-dimensional connection structure of the spiral flow channel.

[0041] In the figure: 1. Deposition chamber; 2. Rotary elevator; 3. Graphite heater; 4. Mixed-flow cavity mechanism; 41. Outer shell; 42. Mixed gas pipe; 43. Magnetic winding coil; 44. Heat-insulating hollow cylinder; 45. Inner shell; 5. Reaction gas injection mechanism; 51. Gas chamber; 52. Inclined tube; 53. Nozzle; 54. Spiral flow channel; 55. Vent hole; 6. Blowtorch mechanism; 61. Blowtorch shell; 62. Vent pipe; 63. Deflector; 64. Shunt plate; 65. Through hole; 66. Rib partition. Specific implementation mode

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Embodiment 1. Refer to Figures 1 to 16 An optical fiber preform processing device as shown, which includes 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 to the bottom of the rotary elevator 2. A graphite heater 3 is arranged on the upper part of the inner wall of the deposition chamber 1. A mixing flow cavity mechanism 4 for regulating the eddy current mode of the hydrogen-oxygen flame, controlling the mixing of reaction gases and depositing them on the surface of the target is arranged below the graphite heater 3 on the inner wall of the deposition chamber 1. A plurality of burner mechanisms 6 for ejecting hydrogen-oxygen flames are arranged on the inner wall of the mixing flow cavity mechanism 4 in a spiral laminated distribution. The jet gas flow rates of the plurality of burner mechanisms 6 increase sequentially from high to low, and the burner mechanisms 6 are distributed in a conical spiral. The distance from the burner mechanism 6 at the uppermost part to the central axis of the optical fiber preform is greater than the distance from the burner mechanism 6 at the bottommost part to the central axis of the optical fiber preform;

[0044] The bottom of the mixing flow cavity mechanism 4 is provided with an annular reaction gas ejection mechanism 5 that ejects reaction gases and cooperates with the burner mechanism 6 to control the deposition of particles on the optical fiber preform.

[0045] It should be noted that the target rod core of the optical fiber preform is preferably installed at the lower end of the rotary elevator 2 and placed into the deposition chamber 1. The target rod core needs to penetrate through the graphite heater 3, the mixing flow cavity mechanism 4, the reaction gas ejection mechanism 5, and the burner mechanism 6. When manufacturing the optical fiber preform, the rotary elevator 2 drives the target rod core to rotate and gradually lift upward. At the same time, the reaction gas ejection mechanism 5 ejects reaction gases while the burner mechanism 6 ejects hydrogen-oxygen gases and ignites them. The newly generated particles accumulate continuously on the target rod core;

[0046] The provided burner mechanisms 6 are distributed in a spiral laminated manner, and the jet gas flow rates of the multiple provided burner mechanisms 6 increase sequentially from high to low and are distributed in a conical spiral. Since the rotary elevator 2 drives the target rod core to rotate and gradually lift upward, the size and temperature of the hydrogen-oxygen flame ejected by the burner mechanism 6 at the bottom can quickly react with the reaction gases to generate Particles are deposited on the core of the target rod. As the preform is lifted, the size and temperature of the flame ejected by the torch mechanism 6 gradually decrease. The surface of the preform formed by deposition is porous, and the preform formed by deposition is in an inverted cone shape when it is inside the mixing chamber mechanism 4. It is necessary to react with the reaction gas through the torch mechanism 6 to continuously deposit and fill the porous surface of the preform with particles to produce a cylindrical preform;

[0047] Among them, the torch mechanism 6 adopts a spiral laminated distribution design, enabling the oxyhydrogen flame to cover a larger area, thereby increasing the chance of contact between the reaction gas and the flame, and promoting the effective generation of particles. The gas jet flow rate of the torch mechanism gradually decreases from the bottom to the top, forming a conical spiral distribution, ensuring more heat and a larger flame are generated near the core of the target rod at the initial stage of deposition, which is beneficial for quickly starting the deposition process, and adjusting the flame size as the preform grows to adapt to the change of the deposition rate, ensuring the uniformity of deposition throughout the process.

[0048] Since the preform formed by deposition is in an inverted cone shape inside the mixing chamber mechanism 4, by adjusting the position and flame intensity of the torch mechanism 6, particles can be more evenly deposited on the surface of the preform, especially filling the porous area, and finally producing a cylindrical preform. The high-temperature large flame generated by the bottom torch first acts on the core of the target rod. As the preform is lifted, the flame gradually becomes smaller and weaker. The temperature can be precisely controlled according to the requirements of different stages, avoiding problems such as local overheating or insufficient cooling, which is beneficial for forming a high-quality preform.

[0049] The distance between the topmost torch mechanism 6 and the central axis of the preform is greater than the distance between the bottommost torch mechanism 6 and the central axis of the preform. Due to the continuous deposition of particles on the core of the target rod of the preform, the diameter becomes larger. As the preform rotates and rises, it can ensure that the distance between the torch mechanism 6 and the surface of the preform is the same, enabling the generated particles to be effectively deposited on the surface of the preform;

[0050] Among them, since the topmost torch mechanism is far from the central axis of the 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, ensuring that all torch mechanisms 6 maintain the same distance from the surface of the preform, achieving more uniform particle deposition, and avoiding problems of excessive or insufficient deposition in local areas.

[0051] Maintaining a constant distance from the torch to the surface of the preform means that the flame temperature and reaction gas concentration at each position are relatively stable, which is beneficial for generating high-quality particles and ensure that they can effectively adhere to the surface of the preform to reduce the occurrence of irregular deposition.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The optimized flame shape and stable combustion conditions help reduce surface defects such as bubbles and cracks caused by excessive or too low local temperatures, thereby improving the overall quality and performance of the preform. For the already formed porous preform, the flame under electromagnetic field control can better fill these pores, producing a denser and smoother preform surface.

[0058] Example 2. Based on the blowtorch mechanism 6 proposed in Example 1, this example provides a further technical solution for the blowtorch mechanism 6.

[0059] The blowtorch mechanism 6 includes a blowtorch housing 61. The gas outlet of the blowtorch housing 61 is a tapered and widened nozzle for accelerating the ejection of hydrogen-oxygen gas. On one side of the outer surface of the blowtorch housing 61, there is a ventilation pipe 62. The ventilation pipe 62 penetrates through the inner housing 45 and the heat-insulating hollow cylinder 44 and is communicated with the inside of the mixed gas pipe 42.

[0060] Inside the blowtorch housing 61, there is a flow dividing plate 64 for uniformly controlling the discharge of hydrogen-oxygen gas. A number of through holes 65 distributed in a rectangular array are formed on the outer surface of the flow dividing plate 64. On one side of the flow dividing plate 64, there are a number of equally spaced rib partitions 66 for guiding the gas into the through holes 65, and the rib partitions 66 are located on the side away from the guide vane 63.

[0061] It should be noted that during use, the hydrogen-oxygen gas is sprayed into the inside of the blowtorch housing 61 through the ventilation pipe 62. After the gas enters the inside of the blowtorch housing 61, it passes through the through holes 65 under the guidance of the rib partitions 66, enabling the gas to pass through the through holes 65 evenly.

[0062] Inside the blowtorch housing 61, there are a number of equally spaced guide vanes 63 for controlling the flow direction of hydrogen-oxygen gas. The guide vanes 63 are in the shape of flat water droplets.

[0063] Among them, when the hydrogen-oxygen gas passes through the through holes 65, it will be guided by the guide vanes 63. Since the set guide vanes 63 are in the shape of flat water droplets and the gas outlet of the blowtorch housing 61 is a tapered and widened nozzle, the hydrogen-oxygen gas is accelerated and ejected, and the jet combustion distance of the flame can be increased.

[0064] Among them, the gas outlet of the blowtorch housing 61 adopts a tapered and widened design, similar to the Venturi effect, which increases the speed of the gas when passing through, not only improving the ejection speed of the gas but also enhancing the penetration power of the flame, enabling the flame to maintain a high-temperature state at a farther distance.

[0065] The guide vanes 63 set in the shape of flat water droplets further guide the gas flow direction, ensuring that the gas is ejected from the nozzle at the most optimized angle and speed, forming a more concentrated and stable flame shape, which is conducive to the effective contact and full reaction between the reaction gas and the flame.

[0066] Due to the accelerated ejection of gas and the nozzle design that increases the jet combustion distance of the flame, the flame can maintain a high-temperature state in a larger area, which is beneficial for promoting the decomposition of reaction gases such as and the generation of particles. At the same time, it also helps to improve the overall combustion efficiency. Moreover, the uniform gas distribution, combined with the optimized jet angle and speed, jointly form a more stable and controllable flame structure.

[0067] Due to the more uniform distribution of the flame temperature, the reaction gases can be fully heated and participate in chemical reactions in a larger range, thereby forming a more uniform deposition layer on the surface of the target rod core, reducing defects caused by uneven local deposition, such as thickness differences, bubbles, etc., improving the quality of the preform. For the already formed porous preform, under the optimized flame conditions, the particles can more effectively fill these pores, producing a more dense and smooth preform surface, meeting the requirements of the subsequent wire drawing process.

[0068] Example 3: Based on the mixed-flow cavity mechanism 4 proposed in Example 1, this example provides a further technical solution for the mixed-flow cavity mechanism 4.

[0069] The mixed-flow cavity mechanism 4 includes a housing 41, which is fixedly installed on the inner wall of the deposition chamber 1 and is located below the graphite heater 3. The bottom wall of the housing 41 is provided with an inner housing 45. The inner housing 45 and the housing 41 form a sealed cavity, and a number of mixed gas pipes 42 distributed in a circular array are arranged inside the cavity, and the mixed gas pipes 42 are attached to the inner wall of the housing 41.

[0070] The upper end of the inner housing 45 is provided with a heat-insulating hollow cylinder 44. The cavity formed by the combination of the housing 41 and the inner housing 45 is filled with an inert heat-insulating gas, which is communicated with the external circulation gas pipe of the deposition chamber 1 for heat insulation.

[0071] It should be noted that the cavity formed by the housing 41 and the inner housing 45 is filled with a heat-insulating and flame-retardant gas, which can prevent the high temperature from affecting the normal operation of the magnetic winding coil 43. The hydrogen-oxygen gas inside the ventilation pipe 62 extends to the inside of the mixed gas pipe 42, and the mixed gas pipe 42 is used to mix the hydrogen-oxygen gas, and each mixed gas pipe 42 is separately connected to the air flow pipe outside the deposition chamber 1.

[0072] A magnetic winding coil 43 for generating an electromagnetic field to affect the shape of the flame is arranged in the cavity formed by the combination of the housing 41 and the inner housing 45. The magnetic winding coil 43 is located at the cavity position between the heat-insulating hollow cylinder 44 and the housing 41.

[0073] Among them, the way in which the magnetic winding coil 43 generates an electromagnetic field to affect the hydrogen-oxygen flame eddy current is that when the flame is in the electromagnetic field, since charged particles such as electrons and ions in the flame will be affected by the Lorentz force, it causes changes in the hydrodynamic properties inside the flame, thereby affecting the shape, stability, and eddy current pattern of the flame, further changing the combustion reaction path of the hydrogen-oxygen flame, increasing the free radical concentration, promoting the combustion efficiency, and possibly redistributing the eddy current inside the flame. By controlling the hydrogen-oxygen flame with the magnetic winding coil 43, the generated way in which the particles accumulate on the optical fiber preform, and the provided magnetic winding coil 43 can be set as a transverse winding coil or a longitudinal winding coil.

[0074] Among them, by setting a heat-insulating and flame-retardant gas inside the cavity formed by the outer shell 41 and the inner shell 45, it can effectively prevent the influence of high temperature on the magnetic winding coil 43. This not only extends the service life of the magnetic winding coil but also ensures its stable operation in a high-temperature environment, providing a continuous and uniform electromagnetic field.

[0075] When the hydrogen-oxygen flame is in the electromagnetic field generated by the magnetic winding coil 43, charged particles such as electrons and ions in the flame will be affected by the Lorentz force, resulting in changes in the hydrodynamic properties inside the flame. The shape, stability, and eddy current pattern of the flame can be adjusted to make it more concentrated or diffused to adapt to different deposition requirements.

[0076] The electromagnetic field can change the combustion reaction path by increasing the free radical concentration, enabling hydrogen and oxygen to combine more effectively, generating more heat and active species, and using a higher combustion efficiency for decomposing reaction gases such as so as to generate more particles.

[0077] The electromagnetic field can redistribute the eddy current inside the flame, making the mixing between the reaction gas and the flame more uniform. Uniform mixing helps to form a consistent layer on the entire surface of the preform, reducing the problem of excessive or insufficient local deposition.

[0078] The magnetic winding coil 43 can be set as a transverse winding or a longitudinal winding according to needs, which are respectively suitable for the magnetic field regulation requirements in different directions. For example, the transverse winding is more suitable for adjusting the width and expansion angle of the flame, while the longitudinal winding is beneficial for controlling the height and length of the flame. Each mixing gas tube 42 is separately connected to the air flow tube outside the deposition chamber 1, ensuring that the ratio of hydrogen-oxygen gas in each mixing gas tube is precisely controllable, which helps to maintain the consistency of the working state of each torch mechanism 6 and avoid deposition deviation caused by uneven gas flow.

[0079] Example 4: Based on the reaction gas blowing mechanism 5 provided in Example 1, this example provides a further technical solution for the reaction gas blowing mechanism 5.

[0080] The reaction gas injection mechanism 5 includes a gas chamber 51, which is fixedly installed on the inner wall of the deposition chamber 1. Inside the gas chamber 51, a number of inclined tubes 52 are arranged in a circular array. One end of each of the number of inclined tubes 52 is provided with a nozzle 53. The nozzle 53 is arranged obliquely and is in the shape of a flat nozzle.

[0081] It should be noted that the reaction gas enters the inside of the inclined tube 52 and then is ejected through the nozzle 53. The arranged inclined tubes 52 are distributed in a circular array, and the multiple arranged nozzles 53 eject the reaction gas in a vortex state to catalytically generate particles. Since the arranged blowtorch mechanism 6 is distributed in a spiral laminated manner and cooperates with it, the generated particles can be evenly stacked on the optical fiber preform.

[0082] At the upper end of the gas chamber 51, there is a spiral flow channel 54 communicating with its interior. A number of ventilation holes 55 are formed on the outer surface of the spiral flow channel 54, and the spiral flow channel 54 is in a spiral shape.

[0083] Among them, the spiral flow channel 54 is in a spiral shape, and the positions of the coiled ventilation holes 55 of the spiral flow channel 54 are all located below the blowtorch housing 61. When the reaction gas is ejected through the ventilation holes 55, it can quickly react with the hydrogen-oxygen flame.

[0084] Among them, 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 ejected. The vortex flow helps to increase the contact area between the reaction gas and the hydrogen-oxygen flame, promotes a more efficient chemical reaction, and thus generates more particles. Since the reaction gas is directly ejected into the hydrogen-oxygen flame through the ventilation holes 55, the time from ejection to participation in the reaction of the reaction gas is shortened, ensuring that the reaction gas can be quickly decomposed and participate in the chemical reaction in the high-temperature region.

[0085] The design of the spiral flow channel 54 enables the reaction gas to pass through a spiral path before entering the blowtorch housing 61, further enhancing the gas mixing uniformity, ensuring that the reaction gas is evenly distributed throughout the flame area, and avoiding problems such as insufficient reaction or overheating in local areas.

[0086] Since the blowtorch mechanism 6 is distributed in a spiral laminated manner and the multiple nozzles 53 eject the reaction gas in a vortex state, it can ensure that the generated particles are evenly stacked on the surface of the optical fiber preform, reducing defects caused by uneven local deposition, such as thickness differences, bubbles, etc., improving the quality of the preform. The blowtorch mechanism 6 being distributed in a spiral laminated manner can flexibly adjust the flame characteristics and position according to the actual deposition situation, and is suitable for manufacturing preforms with different diameters and lengths.

[0087] The present invention also provides a method for using an optical fiber preform processing device, and the specific usage method is as follows:

[0088] S1. First, the target rod core of the optical fiber preform is installed at the lower end of the rotary elevator 2 and placed into the deposition chamber 1. The target rod core needs to penetrate through the graphite heater 3, the mixed-flow cavity mechanism 4, the reaction gas injection mechanism 5, and the blowtorch mechanism 6. When manufacturing the optical fiber preform, the rotary elevator 2 drives the target rod core to rotate and gradually lift upward. At the same time, the reaction gas injection mechanism 5 injects the reaction gas, and the blowtorch mechanism 6 injects and ignites the hydrogen-oxygen gas. The reaction gas is heated by the hydrogen-oxygen flame, and the newly generated particles continuously accumulate on the target rod core;

[0089] S2. The provided blowtorch mechanism 6 is arranged in a spiral laminated distribution, and the jet gas flow rates of the multiple provided blowtorch mechanisms 6 increase sequentially from high to low and are distributed in a conical spiral. Since the rotary elevator 2 drives the target rod core to rotate and gradually lift upward, the size and temperature of the hydrogen-oxygen flame ejected by the blowtorch mechanism 6 at the bottom can quickly react with the reaction gas to generate particles that accumulate on the target rod core. As the optical fiber preform is lifted, the size and temperature of the flame ejected by the blowtorch mechanism 6 gradually decrease. Since the surface of the deposited optical fiber preform is porous and the deposited optical fiber preform is in an inverted cone shape when inside the mixed-flow cavity mechanism 4, it is necessary to react the blowtorch mechanism 6 with the reaction gas to continuously accumulate particles to fill the porous surface of the optical fiber preform, and a cylindrical optical fiber preform is produced;

[0090] The distance between the blowtorch mechanism 6 at the uppermost part and the central axis of the optical fiber preform is greater than the distance between the blowtorch mechanism 6 at the bottommost part and the central axis of the optical fiber preform. Then, due to the continuous accumulation of particles, the diameter of the target rod core of the optical fiber preform becomes larger. As the optical fiber preform rotates and rises, it can ensure that the distance between the blowtorch mechanism 6 and the surface of the optical fiber preform is the same, so that the generated particles can be effectively accumulated on the surface of the optical fiber preform;

[0091] S3. When the blowtorch mechanism 6 ejects the hydrogen-oxygen flame, the mixed-flow cavity mechanism 4 generates an electromagnetic field to affect the hydrogen-oxygen flame vortex. When the flame is in the electromagnetic field, since the charged particles in the flame, such as electrons and ions, will be affected by the Lorentz force, the hydrodynamic properties inside the flame will change, thereby affecting the shape, stability, and vortex mode of the flame, and then changing the combustion reaction path of the hydrogen-oxygen flame, increasing the free radical concentration, promoting the combustion efficiency, and possibly redistributing the vortices inside the flame. By controlling the hydrogen-oxygen flame through the mixed-flow cavity mechanism 4, the way of particles accumulating on the optical fiber preform is changed.

[0092] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within 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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