Low-helium wire drawing cooling system

Abstract

The invention belongs to the field of optical fiber processing, and particularly discloses a low-helium wire drawing cooling system which comprises two cooling pipe bodies, the two cooling pipe bodies are arranged in a bilateral symmetry mode, an optical fiber wire drawing channel is formed between the two cooling pipe bodies, and the two ends of the optical fiber wire drawing channel are each of an opening structure; the helium injection mechanism is mounted on the cooling pipe body and is used for injecting helium into the optical fiber drawing channel; the water cooling mechanism is mounted on the cooling pipe body; the cooling pipe body is further provided with a plurality of backflow channels, the inlet ends and the outlet ends of the backflow channels are communicated with the optical fiber drawing channels, and helium in the optical fiber drawing channels flows out through the backflow channels to generate backflow resistance so as to prevent the helium in the optical fiber drawing channels from flowing out. By means of the structural design, the helium flow path is optimized, helium waste is reduced, the water-cooling cooling mechanism is combined, the dual purposes of efficient cooling of optical fibers and cost saving are achieved, and meanwhile it is ensured that cooling is uniform in the optical fiber drawing process.

Description

Technical Field

[0001] The present application belongs to the field of optical fiber processing, and more specifically, relates to a low-helium drawing cooling system. Background Art

[0002] With the rapid development of fiber-optic communication technology, market demand for optical fiber continues to rise. Fiber optic manufacturers are constantly increasing drawing speeds to improve production efficiency. However, this increase in drawing speed poses a significant challenge to the cooling efficiency of equipment. During the high-speed drawing process, optical fiber is rapidly formed from a high-temperature molten state, requiring minimal cooling time. Insufficient cooling can lead to quality issues, impacting performance and stability.

[0003] Traditional cooling methods rely primarily on natural cooling or air cooling, which is slow and difficult to meet the demands of high-speed wire drawing. To extend cooling time, some companies have attempted to address this issue by increasing the height of the drawing tower. However, this not only increases construction costs and floor space, but also makes retrofitting older equipment difficult. Furthermore, the height of the drawing tower cannot be increased indefinitely, making this approach difficult to implement widely. Summary of the Invention

[0004] In response to the defects of the existing technology, the present application provides a low-helium drawing cooling system, which aims to solve the problems of high modification cost of cooling equipment, low cooling efficiency and difficulty in meeting the needs of high-speed drawing in optical fiber production caused by traditional cooling methods.

[0005] The present application provides a low-helium wire drawing cooling system, specifically comprising: A cooling tube body, wherein the cooling tube bodies are provided in two and are arranged symmetrically on the left and right, and an optical fiber drawing channel is formed between the two cooling tube bodies, and both ends of the optical fiber drawing channel are open structures; a helium injection mechanism, the helium injection mechanism being mounted on the cooling tube body and being used for injecting helium into the optical fiber drawing channel; A water-cooling mechanism, which is installed on the cooling tube body and is used to cool the inner wall of the optical fiber drawing channel; The cooling tube body is also provided with a plurality of reflux channels, the inlet and outlet ends of which are both connected to the optical fiber drawing channel. The helium in the optical fiber drawing channel generates reflux resistance after flowing out through the reflux channel, thereby hindering the outflow of helium in the optical fiber drawing channel, thereby reducing the amount of helium injected.

[0006] The above technical solution conceived by the present application, compared with the existing technology, since the water-cooling cooling mechanism cools the inner wall of the optical fiber drawing channel, the helium injected into the optical fiber drawing channel can conduct the heat of the optical fiber, and a reflux channel is provided in the optical fiber drawing channel. The flow path of the helium in the channel is optimized. The design of the reflux channel causes the helium to generate reflux resistance after flowing out, hindering the rapid loss of helium, thereby extending the residence time of the helium in the channel, improving the cooling efficiency of the optical fiber, reducing the waste of helium, and reducing the cost of optical fiber production. It can achieve the dual goals of achieving efficient cooling of the optical fiber and cost savings, while ensuring the beneficial effect of uniform cooling during the optical fiber drawing process.

[0007] As a further preference, the optical fiber drawing channel is a cylindrical structure.

[0008] As a further preferred embodiment, the helium injection mechanism includes an adjustable helium nozzle and an external gas source, the adjustable helium nozzle is fixedly connected to any one of the cooling tube bodies and is located at the input end of the optical fiber drawing channel, and the adjustable helium nozzle is connected to the outlet of the external gas source.

[0009] As a further preference, two groups of the water-cooling cooling mechanisms are provided, and the two groups of the water-cooling cooling mechanisms are respectively located on the two cooling pipe bodies and are arranged symmetrically on the left and right.

[0010] As a further preferred embodiment, the water cooling mechanism includes a cooling tube water jacket and an external water source. The cooling tube water jacket is fixedly connected to the cooling tube body. A cavity is provided inside the cooling tube water jacket. A water inlet and a water outlet are respectively provided at both ends of the cooling tube water jacket. The cooling tube water jacket is connected to the external water source through the water inlet and the water outlet so that the cavity is filled with flowing cooling water.

[0011] As a further preference, a plurality of the return channels are evenly distributed along the axial direction of the optical fiber drawing channel.

[0012] As a further preference, the momentum direction of the helium in the optical fiber drawing channel is opposite to the momentum direction of the helium flowing out of the return channel in the axial direction of the optical fiber drawing channel.

[0013] As a further preference, the reflux channel includes a connected straight path and a curved path, the straight path guides the helium from the optical fiber drawing channel into the curved path and realizes circular rotation within the curved path, and the outlet direction of the curved path is set so that the helium flows out in a tangential direction of the circumference.

[0014] As a further preference, the inner wall of the optical fiber drawing channel is set to be a rough surface.

[0015] As a further preference, the low-helium drawing cooling system further includes a helium detector, which is fixedly connected to any one of the cooling tubes and is located at the output end of the optical fiber drawing channel.

[0016] In general, the above technical solutions conceived by this application have the following technical advantages compared with the existing technologies: 1. This water-cooling system combines a water-cooling mechanism with helium heat conduction to cool the moving optical fiber. The water-cooling mechanism cools the inner wall of the optical fiber drawing channel, while the helium conducts heat away from the optical fiber. This combination creates a low-temperature and stable cooling environment in the optical fiber drawing channel. The roughened design of the inner wall of the optical fiber drawing channel and the optimization of the return flow channel further enhance the uniformity of the cooling effect.

[0017] 2. By optimizing the helium flow path and providing a return channel, the water-cooling system in this application significantly improves helium cooling efficiency and reduces its usage. Helium's high thermal conductivity makes it an ideal heat dissipation medium, and the design of the return channel extends the helium's residence time within the fiber drawing channel, reducing helium waste. This not only reduces the cost of optical fiber production but also ensures efficient fiber cooling.

[0018] 3. The symmetrical design and opening structure of the cooling tubes in this application's water-cooling system ensure uniform helium flow and smooth passage of optical fiber, while also improving the overall stability of the system. The reverse-direction reflux design and optimized flow path further stabilize the helium flow and avoid uneven fiber cooling. This not only optimizes cooling efficiency but also enhances system reliability, making it suitable for large-scale optical fiber production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the cooling system provided in an embodiment of the present application; Figure 2 is a schematic side view of the cooling system provided in an embodiment of the present application; Figure 3 yes Figure 2 Schematic diagram of the cross-section structure along line AA; Figure 4 1 is a schematic diagram of the front view of the cooling system provided in an embodiment of the present application; Figure 5 yes Figure 4 Schematic diagram of the cross-section structure along line BB; Figure 6 yes Figure 5 The enlarged structural diagram of the middle C part; Figure 7 This is a helium control flow chart of the cooling system provided in an embodiment of the present application; Figure 8This is a schematic diagram of the connection structure of two cooling tubes in another embodiment; Figure 9 It is a graph showing the temperature change of optical fiber in helium environment and air environment over time; Figure 10 It is a structural diagram of the optical fiber using air and helium segmented cooling method in high-speed drawing production.

[0020] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Cooling tube body; 11. Fiber drawing channel; 12. Return channel; 121. Straight path; 122. Curved path; 13. Guide rail; 2. Helium injection mechanism; 21. Adjustable helium nozzle; 22. External air source; 3. Water cooling mechanism; 31. Cooling tube water jacket; 311. Cavity; 312. Water inlet; 313. Water outlet; 32. External water source; 4. Helium detector; 5. Compression cylinder. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0022] During the optical fiber drawing process, the fiber preform is first heated to approximately 2000°C, transforming it into molten glass. Under the influence of drawing tension, the molten glass is drawn into glass filaments with a diameter of approximately 125 microns for subsequent processing. Due to the extremely high initial temperature of the molten glass, the temperature of the drawn optical fiber filaments is also correspondingly high. Therefore, after drawing, the optical fiber needs to be cooled to a certain temperature before it can enter the subsequent production process.

[0023] In the actual production process of optical fiber, since the optical fiber is in a state of rapid motion, during the cooling process, the hot optical fiber mainly dissipates heat through radiation and thermal convection, among which thermal convection plays a more important role in optical fiber cooling.

[0024] When using a traditional drawing tower to cool optical fiber, once the tower's height is determined, the cooling time decreases as the drawing speed increases. Specifically, the higher the speed, the shorter the cooling time. If the fiber's temperature does not drop sufficiently during cooling, subsequent fiber production processes will be affected. Therefore, high-speed drawing requires sufficient convective heat transfer efficiency to ensure the fiber is quickly cooled to an appropriate temperature.

[0025] When optical fiber conducts heat in gas, it conforms to the traditional Newtonian convection heat transfer principle. According to the convection heat transfer formula and the actual flow state, the Nusselt number is calculated using the empirical formula related to convection heat transfer. Nu ,in Gr and Pr is a dimensionless quantity characteristic of the fluid; k is the thermal conductivity of gas; d is the fiber diameter, h is the optical fiber convection heat transfer coefficient.

[0026] (1-1) (1-2) According to empirical formulas (1-1) and (1-2), the convective heat transfer coefficient is closely related to the gas flow state, the gas's thermal conductivity, and the characteristic shape of the heat dissipating object. In the optical fiber drawing process, due to the limitations of a stable drawing process, the convective heat transfer coefficient can currently only be improved by changing the thermal conductivity of the gas in the optical fiber's heat dissipation environment.

[0027] According to Newton's law of heat transfer, the convective heat transfer formula (1-3) is obtained. It can be seen that the convective heat transfer coefficient directly affects the convective heat transfer efficiency.

[0028] (1-3) in q is the heat transfer power per unit area of ​​the object, t w is the real-time temperature of the object, t ∞ is the ambient temperature, h is the optical fiber convection heat transfer coefficient.

[0029] During gas convection heat transfer, helium has a relatively high thermal conductivity, significantly better than other common gases. After multiple tests, this application selected helium as the gas in the heat dissipation environment, mainly due to its excellent physical properties (such as high thermal conductivity). Helium can significantly improve heat exchange performance and is an ideal heat dissipation medium. However, as a rare gas, helium is scarce in nature, which makes the acquisition cost of helium high, which in turn puts great pressure on the overall cost of optical fiber production. Therefore, while using helium as a heat dissipation gas, effective measures must be taken to reduce the waste of helium to achieve cost savings.

[0030] The regular characteristics of optical fiber temperature change over time in a certain concentration of helium environment and a pure air environment are simulated based on the relevant data in actual production, such as Figure 9As shown in the figure, when the optical fiber is at a lower temperature, the efficiency difference between air cooling and helium cooling is small. Therefore, from an economic point of view, in practice, in high-speed drawing production, the segmented cooling method of helium cooling and air cooling can be used in sequence to cool the optical fiber. Figure 10 shown.

[0031] The present application discloses a low-helium drawing cooling system. Compared with the traditional optical fiber drawing tower cooling tube, the cooling system has a higher cooling efficiency for cooling optical fibers, can save helium, reduce the production cost of optical fiber drawing, achieve cost reduction and efficiency improvement, and has better economic value. Figure 1 and Figure 4 , which includes a cooling tube body 1, a helium injection mechanism 2, a water cooling mechanism 3 and a helium detector 4; wherein the cooling tube body 1 is provided with two, the two cooling tube bodies 1 are vertically arranged and arranged symmetrically on the left and right, the two cooling tube bodies 1 are locked by bolts to achieve closure, and an optical fiber drawing channel 11 is formed between the two cooling tube bodies 1, and both ends of the optical fiber drawing channel 11 are open structures for optical fiber to pass through; refer to Figure 8 In another feasible embodiment, the two cooling tube bodies 1 are compressed by the compression cylinders 5 on the left and right sides to achieve closure, and the two cooling tube bodies 1 are oriented by the guide rail 13 .

[0032] Reference Figure 2 and Figure 3 Specifically, the cross-section of the cooling tube body 1 along the axis of the optical fiber drawing channel 11 is Ω-shaped. After the two cooling tube bodies 1 are connected, the grooves in the middle cooperate with each other to form a complete optical fiber drawing channel 11. The optical fiber drawing channel 11 is a cylindrical structure, and the flat plates on both sides fit together to facilitate connection and fixation. This design not only ensures that the optical fiber can pass through the channel stably during the drawing process, but also provides space for the uniform distribution of helium. A helium injection mechanism 2 is installed on the cooling tube body 1 to inject helium into the optical fiber drawing channel 11. Since both ends of the optical fiber drawing channel 11 are open structures, there is a certain amount of helium leakage, so the helium injection needs to be continuous. A water cooling mechanism 3 is installed on the cooling tube body 1 to cool the inner wall of the optical fiber drawing channel 11. Under the heat conduction of helium, the heat transfer efficiency of the optical fiber can be improved, thereby improving the cooling efficiency of the optical fiber. A helium detector 4 is fixedly connected to one of the cooling tube bodies 1 and is located at the output end of the optical fiber drawing channel 11. It is used to monitor the helium concentration and flow rate at the helium escape site in real time.

[0033] More specifically, the cooling system is arranged on the optical fiber drawing path, the central axis of the optical fiber coincides with the axis of the optical fiber drawing channel 11, and the diameter of the optical fiber is smaller than the inner diameter of the optical fiber drawing channel 11, so as to ensure that the optical fiber can stably and quickly pass through the optical fiber drawing channel 11. When the optical fiber passes quickly in the optical fiber drawing channel 11, it will accelerate the flow of helium along the drawing direction. According to fluid theory, the faster the optical fiber passes through the optical fiber drawing channel 11, the faster the helium flows out of the optical fiber drawing channel 11. In this way, the more helium leaks from the cavity, resulting in helium consumption during the drawing process. In order to maintain the helium atmosphere of the cooling tube during production, helium needs to be continuously added to the cavity at a certain flow rate to maintain the cooling efficiency. Therefore, the faster the drawing speed, the more helium leaks. At the same time, the higher the concentration of helium in the cavity needs to be, the more helium is consumed.

[0034] Reference Figure 4 In this embodiment, the helium injection mechanism 2 includes an adjustable helium nozzle 21 and an external gas source 22. The adjustable helium nozzle 21 is fixedly connected to one of the cooling tube bodies 1 by bolts. The adjustable helium nozzle 21 is located at the input end of the optical fiber drawing channel 11. The adjustable helium nozzle 21 is connected to the outlet of the external gas source 22. The external gas source 22 introduces a certain amount of helium into the optical fiber drawing channel 11 through the adjustable helium nozzle 21, so that the helium fills the optical fiber drawing channel 11 to form a helium atmosphere, thereby achieving efficient heat transfer; the mechanism can accurately control the flow rate and pressure of helium injected into the optical fiber drawing channel 11, ensuring that the helium can be evenly distributed in the optical fiber drawing channel 11, thereby achieving efficient convective heat exchange; the helium injection mechanism 2 is also equipped with a flow regulating device, which can adjust the injection amount of helium in real time according to the drawing speed and optical fiber temperature to optimize the cooling effect.

[0035] Specifically, two groups of water-cooling cooling mechanisms 3 are provided, and the two groups of water-cooling cooling mechanisms 3 are respectively located on the two cooling pipe bodies 1 and are arranged symmetrically on the left and right; the water-cooling cooling mechanism 3 includes a cooling pipe water jacket 31 and an external water source 32, the cooling pipe water jacket 31 is vertically fixedly connected to the cooling pipe body 1, a cavity 311 is opened inside the cooling pipe water jacket 31, and a water inlet 312 and a water outlet 313 are respectively provided at both ends of the cooling pipe water jacket 31, and the position of the water inlet 312 is lower than the water outlet 313, the cooling pipe water jacket 31 is connected to the external water source 32 through the water inlet 312 and the water outlet 313, so that the cavity 311 is filled with circulating cooling water, and the cooling water circulates in the cavity 311, absorbs heat in the cooling pipe body 1 and the optical fiber drawing channel 11, thereby reducing the temperature in the channel, and the cooling pipe body 1 is made of high thermal conductivity material. When the optical fiber is cooled, the helium gas can quickly transfer the heat of the optical fiber to the cooling tube body 1, and the circulating water in the water jacket then takes away the heat from the cooling tube, thereby achieving a constant temperature of the cooling tube body 1 and maintaining stable and efficient heat transfer. In actual use, the water-cooling mechanism 3 is also equipped with a temperature sensor and a flow controller. The temperature sensor is installed in the cavity 311, and the flow controller is set at the water inlet 312. It can monitor the temperature and flow of the cooling water in real time and automatically adjust it as needed to ensure the stability and reliability of the cooling effect. The temperature sensor and the flow controller are both commonly used equipment in the pump field. They are not the innovation points of this application and will not be introduced in detail here.

[0036] Reference Figure 5 and Figure 6Furthermore, a plurality of reflux channels 12 are provided on the cooling tube body 1, and the reflux channels 12 are evenly arranged along the axial direction of the optical fiber drawing channel 11, and the inlet and outlet ends of these reflux channels 12 are connected to the optical fiber drawing channel 11. Specifically, the reflux channels 12 are provided on the flat plate parts on both sides of the cooling tube body 1, and are located on the side where the two cooling tube bodies 1 are close to each other. After the two cooling tube bodies 1 are connected, the flat plate parts on both sides fit together. When helium flows in the optical fiber drawing channel 11, it can enter from the inlet end of the reflux channel 12 and generate reflux resistance after flowing out from the outlet end of the reflux channel 12, so as to hinder the helium flow speed in the optical fiber drawing channel 11, thereby reducing the escape of helium in the optical fiber drawing channel 11 and reducing the amount of helium injected; at the same time, the setting of the reflux channel 12 increases the contact area between the helium and the inner wall of the optical fiber drawing channel 11, thereby improving the heat transfer efficiency. The helium in the optical fiber drawing channel 11 has a consistent momentum direction during normal flow, usually flowing downward along the axial direction of the optical fiber drawing channel 11. When the helium flows out through the return channel 12, its momentum direction in the axial direction of the optical fiber drawing channel 11 is opposite to the momentum direction of the helium in the optical fiber drawing channel 11. This difference in momentum direction enables the helium flowing out of the return channel 12 to hinder the flow of helium in the optical fiber drawing channel 11, thereby forming a dynamic flow balance in the channel, which helps to stabilize the flow state of the helium and avoid problems such as uneven cooling effect caused by excessive helium flow.

[0037] Specifically, the optical fiber drawing channel 11 is the space where the optical fiber moves. When the optical fiber moves at high speed, the helium will flow rapidly along the middle cylinder with the optical fiber at a certain speed. When the helium flows to the air inlet end of the return channel 12, the gas will be divided into two paths. One path continues to flow along the middle cylindrical space, and the other path flows along the return channel 12. When the airflow in the return channel 12, it will first pass through a straight line, and then enter the curved path 122 to realize circular rotation. After the airflow has completed the circular path, it will flow out of the return channel 12 in the tangential direction of the circular path. At this time, the speed direction of the gas flowing out of the return channel 12 is the same as that of the middle flow channel. The velocity direction in the middle will form a certain obtuse angle. Through the momentum theorem, it can be analyzed that the momentum direction of the gas in the middle cylindrical flow channel in the flow channel direction is opposite to the vertical direction of the gas in the return channel 12. The airflow velocity in the middle flow channel will be weakened. When the airflow passes through several groups of middle cylindrical flow channels and the return channel 12, the airflow velocity will be reduced a lot, so the outflowing airflow will be reduced a lot, and the airflow velocity at the flow channel outlet will be greatly attenuated, which can greatly reduce the flow velocity of helium. When the optical fiber drawing speed increases, the helium flow velocity will not be significantly increased, which greatly reduces the leakage of helium, thereby reducing the consumption of helium.

[0038] Furthermore, the reflux channel 12 includes a connected straight path 121 and a curved path 122. The straight path 121 can guide helium from the optical fiber drawing channel 11 into the curved path 122 and realize circular rotation within the curved path 122. The outlet direction of the curved path 122 is set so that the helium flows out in a tangential direction of the circumference. The function of the straight path 121 is to guide the helium gas to flow smoothly from the optical fiber drawing channel 11 into the return channel 12, reducing the turbulence and energy loss of the helium gas when entering the return channel 12. After the helium gas enters the curved path 122, it rotates in a circular motion therein. This circular rotation design enables the helium gas to be fully mixed in the return channel 12, increasing the contact area between the helium gas and the inner wall of the channel, thereby improving the cooling efficiency of the helium gas. At the same time, the circularly rotating helium gas can flow out in a tangential direction of the circle when leaving the return channel 12. The outlet direction of the curved path 122 is carefully designed to ensure that the velocity direction of the helium gas when it flows out forms a certain obtuse angle with the velocity direction of the helium gas in the optical fiber drawing channel 11, further enhancing the effect of the return resistance. Through this unique design of the return channel 12, not only can the flow state of the helium gas in the optical fiber drawing channel 11 be effectively regulated and the helium gas flow be precisely controlled, but the cooling efficiency of the helium gas can also be improved, ensuring that the optical fiber is evenly and efficiently cooled during the drawing process, thereby improving the quality and production efficiency of the optical fiber.

[0039] In this embodiment, the inner wall of the optical fiber drawing channel 11 is set to a rough surface. When helium is in the optical fiber drawing channel 11, the contact area with the inner wall of the channel is increased, thereby further improving the heat conduction effect and improving the optical fiber cooling efficiency.

[0040] Reference Figure 7 In this cooling system, the helium gas flow mainly leaks through the lower port of the optical fiber drawing channel 11. Since the Mach number of the gas in the cavity is much lower than 0.3, it can be considered that there is no compression effect on the gas in the cavity, and the gas in the system follows the law of conservation of volume. In order to ensure the stability of the helium concentration inside the optical fiber drawing channel 11, a helium detector 4 is installed at the outlet of the optical fiber drawing channel 11. The helium detector 4 is connected to an external programmable logic controller (PLC). The detector can feed back the helium concentration data to the PLC. The PLC compares the detected concentration value with the preset parameters and controls the helium mass flow controller in the external gas source 22 according to the comparison result to adjust the gas flow, thereby realizing closed-loop control. In this way, the stability of the helium concentration inside the cylindrical cavity can be guaranteed, the stable heat transfer efficiency can be ensured, and the stable control of the process can be achieved.

[0041] To further verify the effect of the return channel 12 in this application, this application designed two sets of comparative tests. In the test, the optical fiber of the same temperature was passed through the optical fiber drawing channel 11 with the return channel 12 and the optical fiber drawing channel 11 without the return channel 12, respectively, so that the temperature of the optical fiber dropped to the same target temperature. The test results showed that when the optical fiber passed through the optical fiber drawing channel 11 with the return channel 12, the mass flow rate of helium injected by the adjustable helium nozzle 21 was 3.2L / min, the helium concentration inside the optical fiber drawing channel 11 was 71.20%, and the helium flow rate at the outlet of the output end of the optical fiber drawing channel 11 was 1.89m / s; when the optical fiber passed through the optical fiber drawing channel 11 without the return channel 12, the mass flow rate of helium injected by the adjustable helium nozzle 21 was 7.4L / min, the helium concentration inside the optical fiber drawing channel 11 was 56%, and the helium flow rate at the outlet of the output end of the optical fiber drawing channel 11 was 4.36m / s. Through comparative tests, it can be clearly seen that the optical fiber drawing channel 11 provided with the reflux channel 12 has significant advantages in helium utilization efficiency and cooling effect, which are specifically manifested as follows: under the premise of achieving the same cooling effect, the provision of the reflux channel 12 can significantly reduce the amount of helium used; the provision of the reflux channel 12 can increase the residence time and utilization rate of helium in the optical fiber drawing channel 11, thereby achieving more efficient cooling; the provision of the reflux channel 12 can effectively control the flow state of helium, reduce the turbulence and waste of helium, and further optimize the cooling effect.

[0042] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or combination thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0043] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0045] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0046] It is easy for those skilled in the art to understand that the above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A low-helium wire drawing cooling system, characterized in that: include: A cooling tube body (1), wherein the cooling tube bodies (1) are provided in two and arranged symmetrically on the left and right, an optical fiber drawing channel (11) is formed between the two cooling tube bodies (1), and both ends of the optical fiber drawing channel (11) are open structures; A helium injection mechanism (2), the helium injection mechanism (2) being installed on the cooling tube body (1) and used for injecting helium into the optical fiber drawing channel (11); A water-cooling cooling mechanism (3), the water-cooling cooling mechanism (3) being installed on the cooling tube body (1) and used for cooling the inner wall of the optical fiber drawing channel (11); The cooling tube body (1) is further provided with a plurality of reflux channels (12), the inlet and outlet ends of the reflux channels (12) being both connected to the optical fiber drawing channel (11). After the helium in the optical fiber drawing channel (11) flows out through the reflux channels (12), a reflux resistance is generated to hinder the outflow of the helium in the optical fiber drawing channel (11), thereby reducing the amount of helium injected.

2. A low-helium wire drawing cooling system according to claim 1, characterized in that: The optical fiber drawing channel (11) is a cylindrical structure.

3. A low-helium wire drawing cooling system according to claim 2, characterized in that: The helium injection mechanism (2) comprises an adjustable helium nozzle (21) and an external gas source (22); the adjustable helium nozzle (21) is fixedly connected to any one of the cooling tube bodies (1) and is located at the input end of the optical fiber drawing channel (11); the adjustable helium nozzle (21) is in communication with the gas outlet of the external gas source (22).

4. A low-helium wire drawing cooling system according to claim 1, characterized in that: The water-cooling and cooling mechanisms (3) are provided in two groups, and the two groups of water-cooling and cooling mechanisms (3) are respectively located on the two cooling pipe bodies (1) and are arranged symmetrically on the left and right.

5. A low-helium wire drawing cooling system according to claim 4, characterized in that: The water-cooling mechanism (3) comprises a cooling pipe water jacket (31) and an external water source (32). The cooling pipe water jacket (31) is fixedly connected to the cooling pipe body (1). A cavity (311) is provided inside the cooling pipe water jacket (31). A water inlet (312) and a water outlet (313) are provided at both ends of the cooling pipe water jacket (31). The cooling pipe water jacket (31) is connected to the external water source (32) via the water inlet (312) and the water outlet (313), so that the cavity (311) is filled with flowing cooling water.

6. A low-helium wire drawing cooling system according to claim 1, characterized in that: The plurality of return channels (12) are evenly distributed along the axial direction of the optical fiber drawing channel (11).

7. The low-helium wire drawing cooling system according to claim 1, characterized in that: The momentum direction of the helium in the optical fiber drawing channel (11) is opposite to the momentum direction of the helium flowing out of the return channel (12) in the axial direction of the optical fiber drawing channel (11).

8. A low-helium wire drawing cooling system according to claim 7, characterized in that: The return channel (12) comprises a connected straight path (121) and a curved path (122); the straight path (121) guides helium from the optical fiber drawing channel (11) into the curved path (122) and realizes circumferential rotation within the curved path (122); the outlet direction of the curved path (122) is set so that the helium flows out in a tangential direction of the circumference.

9. The low-helium wire drawing cooling system according to claim 1, characterized in that: The inner wall of the optical fiber drawing channel (11) is configured as a rough surface.

10. The low-helium wire drawing cooling system according to claim 2, characterized in that: The low-helium drawing cooling system further comprises a helium detector (4), which is fixedly connected to any one of the cooling tube bodies (1) and is located at the output end of the optical fiber drawing channel (11).

Images