Optical fiber drawing cooling device

Abstract

The utility model discloses an optical fiber drawing cooling device which comprises a helium pipe, helium is arranged in the helium pipe, the helium is used for cooling an optical fiber passing through the inside of the helium pipe, and a first nitrogen sealing structure and a second nitrogen sealing structure which are used for forming a dynamic nitrogen barrier and preventing the helium from escaping are respectively arranged at an upper port and a lower port of the helium pipe; the plurality of cooling sleeves are arranged in the circumferential direction of the outer side wall of the helium pipe, and the plurality of cooling sleeves are connected with an external liquid nitrogen supply system; the helium pipe and the plurality of cooling sleeves are accommodated in the wire drawing channel; according to the scheme, the cooling sleeves can be cooled through liquid nitrogen, the helium pipe and helium inside the helium pipe can be cooled through the cooling sleeves, and then the surface of the bare optical fiber can be cooled through the helium; and the upper port and the lower port of the helium pipe can form a dynamic gas barrier by using nitrogen, so that the helium in the helium pipe is effectively prevented from escaping, and the usage amount of the helium is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical fiber processing technical field, concretely relates to a kind of optical fiber drawing cooling device. BACKGROUND

[0002] In the optical fiber drawing process, helium is often used to cool high-temperature optical fiber to ensure the performance of the coating layer;However, the following problems exist in the cooling of helium in the traditional process:

[0003] 1. Large helium consumption: due to the use of helium for full-channel cooling and low recovery efficiency, the cost is high;

[0004] 2. Low cooling efficiency: the overall temperature of the drawing channel is high, and the efficiency of helium cooling is limited;

[0005] 3. Serious resource waste: large amount of helium escapes, especially at the upper and lower openings without effective sealing design, resulting in excessive waste. INVENTION CONTENTS

[0006] In view of the above shortcomings of the prior art, the utility model provides an optical fiber drawing cooling device, which aims to reduce the temperature of the helium tube, optimize the use efficiency of helium and save resources.

[0007] To achieve the above purpose, the utility model employs the following technical solutions:

[0008] An optical fiber drawing cooling device is provided, which includes: a helium tube, the helium tube is provided with helium gas, the helium gas is used to cool the optical fiber passing through the inside of the helium tube, the upper and lower ports of the helium tube are respectively provided with first and second nitrogen gas sealing structures for forming a dynamic nitrogen gas barrier and preventing helium gas from escaping;A plurality of cooling jacket tubes are arranged on the circumference of the outer wall of the helium tube, and the plurality of cooling jacket tubes are connected to an external liquid nitrogen supply system;A drawing channel, the helium tube and the plurality of cooling jacket tubes are all contained in the drawing channel.

[0009] The beneficial effects of the above technical solutions are: the liquid nitrogen can cool the plurality of cooling jacket tubes, which can cool the helium tube and the helium gas inside it, and the helium gas can cool the surface of the bare optical fiber;And the upper and lower ports of the helium tube can form a dynamic gas barrier with nitrogen, effectively preventing the helium gas in the helium tube from escaping and reducing the amount of helium used.

[0010] Further, the first nitrogen sealing structure comprises an annular groove, which is arranged on the inner side wall of the upper port of the helium tube, a plurality of first nitrogen holes are arranged on the circumferential direction of the upper end side wall of the helium tube, the inner side ends of the plurality of first nitrogen holes are in communication with the bottom of the annular groove, and the upper end of the helium tube is provided with a first annular sleeve, the first annular sleeve is provided with a first annular gas path, the outer side ends of the plurality of first nitrogen holes are in communication with the first annular gas path, and the first annular gas path is connected with an external nitrogen supply system.

[0011] Further, the plurality of first nitrogen holes are located on the radial direction of the helium tube.

[0012] The beneficial effects of the above technical scheme are that: the nitrogen can be sprayed to the upper port of the helium tube through the first annular gas path and the plurality of first nitrogen holes, and the nitrogen is horizontally sprayed from the four sides of the helium tube to the center and gradually escapes upward, so that a dynamic nitrogen barrier is formed at the upper port of the helium tube, preventing the helium from escaping from the upper port of the helium tube; the arrangement of the annular groove is beneficial to the diffusion of nitrogen, and improves the stability of the dynamic nitrogen barrier.

[0013] Further, the second nitrogen sealing structure comprises a plurality of second nitrogen holes, which are arranged on the circumferential direction of the lower end side wall of the helium tube in an inclined manner, the lower end of the helium tube is provided with a second annular sleeve, the second annular sleeve is provided with a second annular gas path, the outer side ends of the plurality of second nitrogen holes are in communication with the second annular gas path, and the second annular gas path is connected with an external nitrogen supply system.

[0014] Further, the plurality of second nitrogen holes are located on the same conical surface, and the inner side port of the second nitrogen hole is close to the lower port of the helium tube.

[0015] The beneficial effects of the above technical scheme are that: the nitrogen can be sprayed to the lower port of the helium tube through the second annular gas path and the plurality of second nitrogen holes, and in the radial direction, the nitrogen is sprayed from the four sides of the helium tube to the center, and in the axial direction, the nitrogen is sprayed downward in an inclined manner, which is beneficial to the downward escape of the nitrogen, so that a dynamic nitrogen barrier is formed at the lower port of the helium tube, preventing the helium from escaping from the lower port of the helium tube.

[0016] Further, the helium tube is provided with a temperature sensor and a helium concentration sensor; to monitor the temperature and concentration of the helium in the helium tube in real time, so as to ensure the cooling effect of the optical fiber.

[0017] Further, a flow regulating valve is arranged on the connecting pipeline of the cooling sleeve and the liquid nitrogen supply system, and the heat exchange effect is adjusted by controlling the flow of the liquid nitrogen, so as to realize the temperature control of the helium tube and the helium inside.

[0018] Further, the cooling sleeve is made of a metal heat-conducting material to enhance the heat-conducting performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic view of the optical fiber drawing cooling device.

[0020] Figure 2 It is Figure 1 It is an enlarged view of area A.

[0021] Figure 3 It is Figure 1 It is an enlarged view of area B.

[0022] Wherein, 1, helium tube, 2, cooling sleeve, 3, drawing channel, 4, annular groove, 5, first nitrogen hole, 6, first annular sleeve, 7, first annular gas path, 8, second nitrogen hole, 9, second annular sleeve, 10, second annular gas path, 11, nitrogen supply system, 12, flow regulating valve, 13, liquid nitrogen supply system, 14, optical fiber. DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model are described below, so that the person skilled in the art can understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific embodiments, for the person skilled in the ordinary skill in the art, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, all the utility model creations using the utility model concept are within the scope of protection.

[0024] As Figures 1 to 3 The optical fiber drawing cooling device of the scheme comprises a drawing channel 3, the helium tube 1 is arranged in the drawing channel 3, helium gas is arranged in the helium tube 1, the helium gas is used to cool the optical fiber 14 passing through the inside of the helium tube 1, the first nitrogen sealing structure and the second nitrogen sealing structure for forming dynamic nitrogen gas barrier and preventing helium gas from escaping are arranged at the upper and lower ports of the helium tube 1 respectively, a plurality of cooling sleeves 2 are arranged on the circumference of the outer side wall of the helium tube 1, the cooling sleeve 2 is made of metal heat-conducting material to enhance its heat-conducting performance, a plurality of cooling sleeves 2 are connected with the external liquid nitrogen supply system 13, and the liquid nitrogen supply system 13 is used to supply the circulating flow of liquid nitrogen to the cooling sleeve 2, the liquid nitrogen can be used to cool a plurality of cooling sleeves 2, a plurality of cooling sleeves 2 can cool the helium tube 1 and the helium gas in the helium tube 1, and the helium gas can be used to cool the surface of the optical fiber 14, and the upper and lower ports of the helium tube 1 can form dynamic gas barrier by using nitrogen, thereby effectively preventing the helium gas in the helium tube 1 from escaping and reducing the use amount of helium gas.

[0025] In particular, the reason why the present solution does not directly use liquid nitrogen for cooling is that: the molecular weight of nitrogen is large, the heat exchange efficiency is low, a large flow is required for cooling, and the contact area of the cooled optical fiber 14 is small, which further increases the demand for flow; while the molecular weight of helium is small, the heat exchange efficiency is high, and the flow required for cooling is small, which is suitable for cooling the surface of the optical fiber 14.

[0026] As an optional implementation, the first nitrogen sealing structure includes an annular groove 4 arranged on the inner side wall of the upper port of the helium tube 1, a plurality of first nitrogen holes 5 are arranged on the circumferential direction of the upper end side wall of the helium tube 1, and the plurality of first nitrogen holes 5 are located on the radial direction of the helium tube 1, the inner side end of the plurality of first nitrogen holes 5 is in communication with the bottom of the annular groove 4, and the upper end sealing sleeve of the helium tube 1 is provided with a first annular sleeve 6, the first annular sleeve 6 is provided with a first annular gas path 7, the outer side end of the plurality of first nitrogen holes 5 is in communication with the first annular gas path 7, and the first annular gas path 7 is connected with the external nitrogen supply system 11 through a pipeline.

[0027] The nitrogen gas of the present solution can be sprayed to the upper port of the helium tube 1 through the first annular gas path 7 and the plurality of first nitrogen holes 5, and the nitrogen gas is sprayed from the periphery to the center of the helium tube 1 and gradually escapes upward, so as to form a dynamic nitrogen gas barrier at the inlet port, preventing helium gas from escaping from the inlet port of the helium tube 1; wherein the arrangement of the annular groove 4 is beneficial to the diffusion of nitrogen gas, and improves the stability of the dynamic nitrogen gas barrier.

[0028] As an optional implementation, the second nitrogen sealing structure includes a plurality of second nitrogen holes 8, the plurality of second nitrogen holes 8 are arranged on the circumferential direction of the lower end side wall of the helium tube 1 in an inclined manner, the plurality of second nitrogen holes 8 are located on the same conical surface, and the inner side port of the second nitrogen hole 8 is close to the lower port of the helium tube 1, the lower end sealing sleeve of the helium tube 1 is provided with a second annular sleeve 9, the second annular sleeve 9 is provided with a second annular gas path 10, the outer side end of the plurality of second nitrogen holes 8 is in communication with the second annular gas path 10, and the second annular gas path 10 is connected with the external nitrogen supply system 11 through a pipeline.

[0029] The nitrogen gas of the present solution can be sprayed to the lower port of the helium tube 1 through the second annular gas path 10 and the plurality of second nitrogen holes 8, and in the radial direction, the nitrogen gas is sprayed from the periphery to the center of the helium tube 1, while in the axial direction, the nitrogen gas is sprayed downward in an inclined manner, which is beneficial to the downward escape of the nitrogen gas and the formation of a dynamic nitrogen gas barrier at the lower port of the helium tube 1, preventing helium gas from escaping from the lower port of the helium tube 1.

[0030] As an optional implementation, the helium tube 1 is provided with a temperature sensor and a helium gas concentration sensor; to monitor the temperature and concentration of helium gas in the helium tube 1 in real time, so as to ensure the cooling effect of the optical fiber 14.

[0031] As an optional embodiment, a flow regulating valve 12 is arranged on the connecting pipeline of the cooling jacket 2 and the liquid nitrogen supply system 13, and the heat exchange effect is regulated by controlling the flow of the liquid nitrogen, so as to realize the temperature control of the helium tube 1 and the helium gas inside the helium tube 1.

Claims

1. A fiber drawing and cooling device, characterized in that, include: A vertical helium tube is provided with helium gas inside the tube. The helium gas is used to cool the optical fiber passing through the inside of the helium tube. The upper and lower ports of the helium tube are respectively provided with a first nitrogen gas sealing structure and a second nitrogen gas sealing structure to form a dynamic nitrogen gas barrier and prevent helium gas from escaping. A plurality of cooling sleeves are arranged circumferentially on the outer wall of the helium tube, and all of the cooling sleeves are connected to an external liquid nitrogen supply system. The drawing channel is provided within which the helium tube and several cooling sleeves are housed.

2. The optical fiber drawing and cooling device according to claim 1, characterized in that, The first nitrogen sealing structure includes an annular groove, which is formed on the inner side wall of the upper end of the helium tube. A plurality of first nitrogen holes are formed circumferentially on the upper side wall of the helium tube. The inner ends of the plurality of first nitrogen holes are connected to the bottom of the annular groove. A first annular sleeve is provided on the upper end of the helium tube. A first annular gas passage is provided inside the first annular sleeve. The outer ends of the plurality of first nitrogen holes are connected to the first annular gas passage, and the first annular gas passage is connected to an external nitrogen supply system.

3. The optical fiber drawing and cooling device according to claim 2, characterized in that, Several of the first nitrogen gas holes are located radially on the helium tube.

4. The optical fiber drawing and cooling device according to claim 1, characterized in that, The second nitrogen sealing structure includes a plurality of second nitrogen holes, which are inclinedly opened on the circumferential direction of the lower end sidewall of the helium tube. The lower end of the helium tube is fitted with a second annular sleeve, and a second annular gas passage is provided inside the second annular sleeve. The outer ends of the plurality of second nitrogen holes are connected to the second annular gas passage, and the second annular gas passage is connected to an external nitrogen supply system.

5. The optical fiber drawing and cooling device according to claim 4, characterized in that, Several of the second nitrogen orifices are located on the same conical surface, and the inner port of the second nitrogen orifice is close to the lower port of the helium tube.

6. The optical fiber drawing and cooling device according to claim 1, characterized in that, The helium tube is equipped with a temperature sensor and a helium concentration sensor.

7. The optical fiber drawing and cooling device according to claim 1, characterized in that, A flow regulating valve is installed on the connecting pipe between the cooling jacket and the liquid nitrogen supply system.

8. The optical fiber drawing and cooling device according to claim 1, characterized in that, The cooling sleeve is made of a metallic thermally conductive material.

Images