CN-224230425-U - Optical fiber drawing cooling device

CN224230425UCN 224230425 UCN224230425 UCN 224230425UCN-224230425-U

Abstract

The utility model discloses an optical fiber drawing cooling device which comprises a helium pipe, a plurality of cooling sleeves, a drawing channel, a helium pipe and a plurality of cooling sleeves, wherein helium is arranged in the helium pipe and used for cooling an optical fiber passing through the interior of the helium pipe, a first nitrogen sealing structure and a second nitrogen sealing structure which are used for forming a dynamic nitrogen barrier and preventing helium from escaping are respectively arranged at the upper port and the lower port of the helium pipe, the plurality of cooling sleeves are arranged on the periphery of the outer side wall of the helium pipe and are connected with an external liquid nitrogen supply system, the drawing channel and the helium pipe and the cooling sleeves are contained in the drawing channel.

Inventors

ZHANG ZHENGTAO
XIANG LEI
Xiang Tongwen
JIA LONG
XIANG YONG
LI YINGJIAN

Assignees

成都中住光纤有限公司

Dates

Publication Date: 20260512
Application Date: 20250428

Claims (8)

1. An optical fiber drawing cooling apparatus, comprising: The helium pipe is internally provided with helium gas, the helium gas is used for cooling optical fibers passing through the inside of the helium pipe, and the upper port and the lower port of the helium pipe are respectively provided with a first nitrogen sealing structure and a second nitrogen sealing structure which are used for forming a dynamic nitrogen barrier and preventing the helium gas from escaping; The cooling sleeves are arranged on the circumference of the outer side wall of the helium pipe and are connected with an external liquid nitrogen supply system; and the helium pipe and the cooling sleeves are contained in the wire drawing channel.
2. The optical fiber drawing cooling device according to claim 1, wherein the first nitrogen sealing structure comprises an annular groove, the annular groove is formed in the inner side wall of the upper port of the helium tube, a plurality of first nitrogen holes are formed in the circumferential direction of the side wall of the upper end of the helium tube, the inner side ends of the first nitrogen holes are communicated with the bottom of the annular groove, a first annular sleeve is arranged at the upper end sealing sleeve of the helium tube, a first annular gas passage is arranged in the first annular sleeve, the outer side ends of the first nitrogen holes are communicated with the first annular gas passage, and the first annular gas passage is connected with an external nitrogen supply system.
3. The optical fiber drawing cooling device according to claim 2, wherein a plurality of the first nitrogen holes are each located in a radial direction of the helium tube.
4. The optical fiber drawing cooling device according to claim 1, wherein the second nitrogen sealing structure comprises a plurality of second nitrogen holes, the second nitrogen holes are obliquely arranged on the circumference of the side wall of the lower end of the helium tube, a second annular sleeve is arranged on the sealing sleeve at the lower end of the helium tube, a second annular air passage is arranged in the second annular sleeve, the outer ends of the second nitrogen holes are communicated with the second annular air passage, and the second annular air passage is connected with an external nitrogen supply system.
5. The optical fiber drawing cooling device according to claim 4, wherein the plurality of second nitrogen holes are all positioned on the same conical surface, and the inner side ports of the second nitrogen holes are close to the lower ports of the helium tube.
6. The optical fiber drawing cooling device according to claim 1, wherein a temperature sensor and a helium concentration sensor are provided in the helium pipe.
7. The optical fiber drawing cooling device according to claim 1, wherein a flow rate regulating valve is provided on a connection line of the cooling jacket and the liquid nitrogen supply system.
8. The optical fiber drawing cooling device according to claim 1, wherein the cooling jacket is made of a metallic heat conductive material.

Description

Optical fiber drawing cooling device Technical Field The utility model relates to the technical field of optical fiber processing, in particular to an optical fiber drawing and cooling device. Background Helium is often used to rapidly cool high temperature optical fibers during fiber drawing to ensure coating performance, however, the cooling of helium in conventional processes has the following problems: 1. helium is consumed in a large amount, and the helium is high in cost due to the fact that the helium is used for full-channel cooling and the recovery efficiency is low; 2. The cooling efficiency is low, the whole temperature of the wire drawing channel is higher, and the efficiency of helium for cooling is limited; 3. The resource waste is serious, the escape amount of helium is large, and particularly, the upper opening and the lower opening have no effective sealing design, so that excessive waste is caused. Disclosure of utility model In order to overcome the defects in the prior art, the utility model provides an optical fiber drawing cooling device, which aims at reducing the temperature of a helium tube, optimizing the use efficiency of helium and saving resources. In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows: The optical fiber drawing and cooling device comprises a helium pipe, a plurality of cooling sleeves, a drawing channel, a helium pipe and a plurality of cooling sleeves, wherein helium is arranged in the helium pipe and used for cooling optical fibers passing through the interior of the helium pipe, a first nitrogen sealing structure and a second nitrogen sealing structure which are used for forming a dynamic nitrogen barrier and preventing helium from escaping are respectively arranged at the upper port and the lower port of the helium pipe, the plurality of cooling sleeves are arranged on the periphery of the outer side wall of the helium pipe and are connected with an external liquid nitrogen supply system, and the helium pipe and the plurality of cooling sleeves are accommodated in the drawing channel. The technical scheme has the advantages that the plurality of cooling sleeves can be cooled through liquid nitrogen, the plurality of cooling sleeves can cool the helium pipe and helium in the helium pipe, 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 utilizing nitrogen, so that the helium in the helium pipe is effectively prevented from escaping, and the use amount of the helium is reduced. Further, the first nitrogen sealing structure comprises an annular groove, the annular groove is formed in the inner side wall of the upper port of the helium pipe, a plurality of first nitrogen holes are formed in the circumferential direction of the side wall of the upper end of the helium pipe, the inner side ends of the plurality of first nitrogen holes are communicated with the bottom of the annular groove, a first annular sleeve is arranged at the upper end sealing sleeve of the helium pipe, a first annular gas passage is arranged in the first annular sleeve, the outer side ends of the plurality of first nitrogen holes are communicated with the first annular gas passage, and the first annular gas passage is connected with an external nitrogen supply system. Further, the first nitrogen holes are all located in the radial direction of the helium pipe. The technical scheme has the beneficial effects that nitrogen can be sprayed to the upper port of the helium pipe through the first annular gas circuit and the first nitrogen holes, and the nitrogen is horizontally sprayed from the periphery of the helium pipe to the center and gradually escapes upwards, so that a dynamic nitrogen barrier is formed at the upper port of the helium pipe to prevent helium from escaping from the upper port of the helium pipe, and the annular groove is beneficial to the diffusion of nitrogen and improves the stability of the dynamic nitrogen barrier. Further, the second nitrogen sealing structure comprises a plurality of second nitrogen holes, the second nitrogen holes are obliquely arranged on the circumference of the side wall of the lower end of the helium pipe, the lower end of the helium pipe is sealed and sleeved with a second annular sleeve, a second annular gas circuit is arranged in the second annular sleeve, the outer ends of the plurality of second nitrogen holes are communicated with the second annular gas circuit, and the second annular gas circuit is connected with an external nitrogen supply system. Further, the second nitrogen holes are all positioned on the same conical surface, and the inner side ports of the second nitrogen holes are close to the lower ports of the helium pipes. The technical scheme has the beneficial effects that nitrogen can be sprayed to the lower port of the helium pipe through the second annular gas circuit