CN108101356B - Method and system for online cooling of optical fiber drawn wire - Google Patents
Method and system for online cooling of optical fiber drawn wire Download PDFInfo
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- CN108101356B CN108101356B CN201711169672.5A CN201711169672A CN108101356B CN 108101356 B CN108101356 B CN 108101356B CN 201711169672 A CN201711169672 A CN 201711169672A CN 108101356 B CN108101356 B CN 108101356B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/50—Cooling the drawn fibre using liquid coolant prior to coating, e.g. indirect cooling via cooling jacket
- C03B2205/51—Cooling the drawn fibre using liquid coolant prior to coating, e.g. indirect cooling via cooling jacket using liquified or cryogenic gas
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Abstract
The invention discloses an optical fiber wire drawing online cooling system which comprises a liquid nitrogen container, a liquid nitrogen pump, a cooling pipe and a gasifier, wherein the liquid nitrogen container is connected with the liquid nitrogen pump and the cooling pipe and is used for storing nitrogen, the liquid nitrogen pump is used for conveying liquid nitrogen from the liquid nitrogen container to the cooling pipe so as to carry out primary cooling on a high-temperature optical fiber penetrating through the whole cooling pipe, the gasifier is connected with the cooling pipe and is used for gasifying one path of liquid nitrogen flowing out after the cooling pipe is cooled and guiding low-temperature nitrogen generated after the liquid nitrogen is gasified into the cooling pipe so as to realize secondary cooling on the high-temperature optical fiber penetrating through the whole cooling pipe, and the liquid nitrogen container is also used for collecting the other path of liquid nitrogen flowing out after the cooling pipe is cooled. The invention can solve the technical problem that the existing hydrogen used as cooling gas is easy to explode at high temperature, so that safety accidents are easy to happen.
Description
Technical Field
The invention belongs to the technical field of optical fiber manufacturing equipment, and particularly relates to an optical fiber drawing on-line cooling method and system.
Background
The speed of optical fiber production is increasing, and the conventional production speed reaches 3000 m/min. In the existing optical fiber production, helium is mainly used for realizing the cooling of optical fiber drawing. However, helium is an expensive noble gas, and its content in air is only about 5.2 parts per million, and therefore, the development of a cooling system that can replace helium is very critical to reduce the production cost of optical fibers.
Chinese patent application CN103274593A proposes an optical fiber drawing on-line cooling system using hydrogen, but this system has some non-negligible disadvantages: firstly, hydrogen is extremely flammable gas, the ignition point is only 574 ℃, and when the concentration of the hydrogen in the mixed gas is 4-74%, the mixed gas is extremely flammable under the stimulation of heat and sunlight; secondly, in the production process of the optical fiber, the temperature of the optical fiber entering the cooling system can reach 900 ℃, and if the process of cooling the optical fiber by using hydrogen is not well controlled, safety accidents are easy to happen.
Disclosure of Invention
In view of the above defects or improvement needs of the prior art, the present invention provides a method and a system for online cooling of an optical fiber drawing wire, which aims to maintain a cooling environment temperature much lower (as low as 200 ℃) than that of the prior cooling method by performing primary cooling on a cooling tube using liquid nitrogen, introduce the liquid nitrogen into a gasification device for gasification, and then introduce the liquid nitrogen into a cavity of the cooling tube to replace helium as a heat-conducting gas, thereby achieving secondary cooling of the optical fiber, and solving the technical problem that the prior art uses hydrogen as a cooling gas to easily explode at high temperature, thereby easily causing safety accidents.
In order to achieve the above object, according to one aspect of the present invention, there is provided an optical fiber drawing on-line cooling system, including a liquid nitrogen container, a liquid nitrogen pump, a cooling pipe, and a vaporizer, wherein the liquid nitrogen container is connected to the liquid nitrogen pump and the cooling pipe and is configured to store nitrogen gas, the liquid nitrogen pump is configured to deliver the liquid nitrogen from the liquid nitrogen container to the cooling pipe so as to perform primary cooling on a high-temperature optical fiber passing through the entire cooling pipe, the vaporizer is connected to the cooling pipe and is configured to vaporize one path of liquid nitrogen flowing out after the cooling pipe is cooled and to introduce low-temperature nitrogen gas generated after the vaporization of the liquid nitrogen into the cooling pipe so as to perform secondary cooling on the high-temperature optical fiber passing through the entire cooling pipe, and the liquid nitrogen container is further configured to collect another path of.
Preferably, the system further comprises an automatic flow control valve connected between the cooling tube and the vaporizer for precisely controlling the flow of liquid nitrogen from the upper exit port of the cooling tube into the vaporizer.
Preferably, the system further comprises a liquid nitrogen pump control cabinet which is electrically connected with the liquid nitrogen pump and used for controlling the flow rate of the liquid nitrogen delivered by the liquid nitrogen pump according to the current temperature of the cooling pipe transmitted by a flow sensor arranged on the cooling pipe.
Preferably, the system further comprises a flow meter connected between the liquid nitrogen container and the liquid nitrogen pump and used for displaying the flow rate of the liquid nitrogen delivered by the liquid nitrogen pump in real time.
Preferably, the liquid nitrogen enters the lower liquid inlet of the cooling pipe through a liquid nitrogen pump and spirals through the spirally-wound sandwich pipeline in the cooling pipe to reach the upper liquid outlet.
Preferably, the upper part, the middle part and the lower part in the cooling pipe are respectively provided with a plurality of groups of air holes for accommodating low-temperature nitrogen generated after gasification of the gasifier.
According to another aspect of the present invention, there is provided a method for in-line cooling of an optical fiber drawn wire, comprising the steps of:
(1) the liquid nitrogen pump conveys liquid nitrogen in the liquid nitrogen container to the cooling pipe, so that the high-temperature optical fiber passing through the cooling pipe is cooled for the first time;
(2) the cooling pipe discharges the cooled liquid nitrogen, wherein one path of liquid nitrogen enters the gasifier, and the other path of liquid nitrogen returns to the liquid nitrogen pump for cyclic utilization;
(3) the vaporizer introduces low-temperature nitrogen gas generated by vaporizing liquid nitrogen into the interior of the cooling tube, thereby achieving secondary cooling of the high-temperature optical fiber passing through the cooling tube.
Preferably, the liquid nitrogen pump delivers liquid nitrogen to the lower inlet of the cooling tube, and the liquid nitrogen then spirals through the spirally wound sandwich tube in the cooling tube and up to the upper outlet.
Preferably, in the step (3), the vaporizer introduces low-temperature nitrogen gas generated by vaporizing liquid nitrogen into a plurality of groups of air holes respectively arranged at the upper part, the middle part and the lower part in the cooling pipe, wherein each group of air holes has 6 or more air holes.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the invention realizes the high-efficiency cooling of the high-temperature optical fiber by using a cooling mode of combining liquid nitrogen and nitrogen generated after gasification, and can solve the technical problems that the hydrogen used in the existing optical fiber cooling method is easy to explode at high temperature and is easy to cause safety accidents.
2. The liquid nitrogen is used for replacing water as the refrigerating liquid of the cooling pipe, so that the temperature of the inner wall of the cooling pipe can be reduced to-180 ℃ to-20 ℃, and the technical problem of poor refrigerating effect caused by using water as the cooling liquid in the prior art can be solved; in addition, the temperature of a cooling pipe in the traditional water cooling method can only be maintained at 0-20 ℃, the flow of gas must be increased to realize good refrigeration effect, and the increase of airflow disturbance can be caused, so that the optical fiber generates following vibration and is not beneficial to the production of the optical fiber.
3. The invention uses nitrogen to replace expensive helium as a heat-conducting medium, saves the production cost of the optical fiber, and is economic and efficient.
4. The nitrogen used by the invention has good air isolation function, thereby playing a role in protecting the optical fiber.
5. The invention recycles the liquid nitrogen which flows out of the cooling pipe and is not cooled by the gasifier to make the liquid nitrogen flow back to the liquid nitrogen tank, thereby realizing the recycling of the liquid nitrogen and ensuring the economy and high efficiency of the whole cooling mechanism.
Drawings
FIG. 1 is a schematic diagram of an in-line cooling system for fiber drawing according to the present invention.
FIG. 2 is a flow chart of a method of in-line cooling of drawn optical fibers according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, according to a first embodiment of the present invention, there is provided an optical fiber drawing on-line cooling system, which includes a liquid nitrogen container 1, a liquid nitrogen pump 2, a liquid nitrogen pump control cabinet 3, a flow meter 4, a cooling pipe 5, an automatic flow control valve 6, and a vaporizer 7.
The liquid nitrogen pump 2 conveys the liquid nitrogen from the liquid nitrogen container 1 to the lower liquid inlet of the cooling pipe 5 through a pipeline, the liquid nitrogen spirals through the interlayer pipeline spirally surrounded in the cooling pipe 5 and reaches the upper liquid outlet, and the scheme that the liquid nitrogen enters from the lower opening and exits from the upper opening is favorable for the heat exchange between the liquid nitrogen and the pipe wall of the cooling pipe 5 more efficiently.
In the embodiment, the spiral surrounding interlayer pipeline is adopted in the cooling pipe 5, so that the contact area between the liquid nitrogen and the pipe wall of the cooling pipe 5 is increased, the cooling efficiency is improved, and the cooling time for starting wire drawing is saved.
Through the refrigeration process of the liquid nitrogen to the tube wall of the cooling tube 5, the cooling tube 5 is cooled to a certain low temperature according to the requirement of the production process (about-180 ℃ to-20 ℃), thereby realizing the primary cooling of the high-temperature optical fiber 8 passing through the whole cooling tube 5.
Be provided with temperature sensor (not shown) on the lateral wall of cooling tube 5, temperature sensor is connected with liquid nitrogen pump control cabinet 3 electricity to can transmit the liquid nitrogen pump control cabinet 3 with the temperature of the cooling tube 5 who gathers, liquid nitrogen pump control cabinet 3 can be according to the flow that the temperature control liquid nitrogen pump 2 of cooling tube 5 that temperature sensor gathered carried the liquid nitrogen, and then the temperature of control cooling tube 5 inner wall.
The flow meter 4 is arranged between the liquid nitrogen container 1 and the liquid nitrogen pump 2 and is used for displaying the flow of the liquid nitrogen conveyed by the liquid nitrogen pump 2 in real time.
An automatic flow control valve 6 is provided between the cooling pipe 5 and the vaporizer 7 for precisely controlling the flow of liquid nitrogen from the upper liquid outlet of the cooling pipe 5 into the vaporizer 7. In this embodiment, the flow rate is in the range of 0 to 30 liters/minute.
The vaporizer 7 vaporizes liquid nitrogen introduced therein, and introduces low-temperature nitrogen gas generated after the vaporization of the liquid nitrogen into the cooling tube 5, thereby achieving secondary cooling of the high-temperature optical fiber 8 passing through the entire cooling tube 5.
In the present embodiment, the vaporizer 7 introduces low-temperature nitrogen gas generated by vaporizing liquid nitrogen into 3 sets of gas holes provided in the upper, middle, and lower portions of the cooling pipe, respectively, through pipelines, and each set of gas holes has 6 or more gas holes.
The optical fiber 8 being manufactured passes through the cavity of the cooling tube 5, and is cooled by being placed in a nitrogen atmosphere having a low temperature, and the temperature of the optical fiber 8 is lowered to a suitable temperature required for coating. Meanwhile, the other path of liquid nitrogen which flows out from the upper liquid outlet of the cooling pipe 5 but does not pass through the automatic flow control valve 6 flows back to the liquid nitrogen tank 1 through a pipeline and is recycled. The residual amount of the liquid nitrogen in the liquid nitrogen tank 1 can be measured by a pressure sensor arranged at the bottom of the tank, and if the residual amount of the liquid nitrogen reaches a critical value, the liquid nitrogen can be supplemented by a manual or automatic feeding system.
As shown in fig. 2, according to a second embodiment of the present invention, there is provided a method for realizing on-line cooling of optical fiber drawing using the above system, comprising the steps of:
(1) the liquid nitrogen pump conveys liquid nitrogen in the liquid nitrogen container to the cooling pipe, so that the high-temperature optical fiber passing through the cooling pipe is cooled for the first time;
preferably, the liquid nitrogen pump is a subsurface liquid inlet that delivers liquid nitrogen to the cooling tube.
Preferably, the step may further include that during the liquid nitrogen transportation process, the liquid nitrogen pump control cabinet controls the flow rate of the liquid nitrogen delivered by the liquid nitrogen pump according to the temperature of the cooling pipe collected by the temperature sensor arranged on the side wall of the cooling pipe, so as to control the temperature of the inner wall of the cooling pipe.
(2) The cooling pipe discharges the cooled liquid nitrogen, wherein one path of liquid nitrogen enters the gasifier, and the other path of liquid nitrogen returns to the liquid nitrogen pump for cyclic utilization;
preferably, the liquid nitrogen is discharged from the upper liquid outlet through a sandwich pipe spirally surrounded by the inner part of the cooling pipe.
Preferably, an automatic flow control valve arranged between the cooling pipe and the gasifier is used for accurately regulating and controlling the gas flow of the liquid nitrogen before the liquid nitrogen enters the gasifier, and the flow range is 0-30 liters/minute.
(3) The vaporizer introduces low-temperature nitrogen gas generated by vaporizing liquid nitrogen into the interior of the cooling tube, thereby achieving secondary cooling of the high-temperature optical fiber passing through the cooling tube.
Preferably, the vaporizer introduces low-temperature nitrogen gas generated by vaporizing liquid nitrogen into 3 sets of gas holes provided in the upper, middle, and lower portions of the cooling pipe, respectively, and each set of gas holes has 6 or more gas holes.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. An optical fiber drawing on-line cooling system comprises a liquid nitrogen container, a liquid nitrogen pump, a cooling pipe and a gasifier, and is characterized in that,
the liquid nitrogen container is connected with the liquid nitrogen pump and the cooling pipe and used for storing nitrogen;
the liquid nitrogen pump is used for conveying liquid nitrogen from the liquid nitrogen container to the cooling pipe, so that the high-temperature optical fiber passing through the whole cooling pipe is cooled once;
the gasifier is connected with the cooling pipe and is used for gasifying one path of liquid nitrogen flowing out after the cooling pipe is cooled and guiding low-temperature nitrogen generated after the liquid nitrogen is gasified into the cooling pipe so as to realize secondary cooling of the high-temperature optical fiber penetrating through the whole cooling pipe, wherein the upper part, the middle part and the lower part in the cooling pipe are respectively provided with a plurality of groups of air holes for containing the low-temperature nitrogen generated after the gasifier is gasified;
the liquid nitrogen container is also used for collecting the other path of liquid nitrogen flowing out after the cooling pipe is cooled.
2. The system of claim 1, further comprising an automatic flow control valve coupled between the cooling tube and the vaporizer for precisely controlling the flow of liquid nitrogen from the upper exit port of the cooling tube into the vaporizer.
3. The system of claim 1, further comprising a liquid nitrogen pump control cabinet electrically connected to the liquid nitrogen pump for controlling the flow rate of the liquid nitrogen delivered by the liquid nitrogen pump according to the current temperature of the cooling pipe transmitted by the flow sensor arranged on the cooling pipe.
4. The system of claim 1, further comprising a flow meter connected between the liquid nitrogen container and the liquid nitrogen pump for displaying in real time the flow rate of liquid nitrogen delivered by the liquid nitrogen pump.
5. The system of claim 1, wherein the liquid nitrogen is pumped into the lower inlet port of the cooling tube by a liquid nitrogen pump and spirals up through the helically wound sandwich tube in the cooling tube to the upper outlet port.
6. A method for in-line cooling of drawn optical fiber using the system of any one of claims 1 to 5, comprising the steps of:
(1) the liquid nitrogen pump conveys liquid nitrogen in the liquid nitrogen container to the cooling pipe, so that the high-temperature optical fiber passing through the cooling pipe is cooled for the first time;
(2) the cooling pipe discharges the cooled liquid nitrogen, wherein one path of liquid nitrogen enters the gasifier, and the other path of liquid nitrogen returns to the liquid nitrogen pump for cyclic utilization;
(3) the vaporizer introduces low-temperature nitrogen generated after the liquid nitrogen is vaporized into the cooling tube, thereby realizing secondary cooling of the high-temperature optical fiber passing through the cooling tube, and the vaporizer specifically introduces the low-temperature nitrogen generated after the liquid nitrogen is vaporized into a plurality of groups of air holes respectively arranged at the upper part, the middle part and the lower part in the cooling tube, and each group of air holes has more than 6 air holes.
7. The method of claim 6, wherein the liquid nitrogen pump delivers liquid nitrogen to the lower inlet port of the cooling tube, and the liquid nitrogen then spirals up through the helically coiled sandwich tube in the cooling tube to the upper outlet port.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711169672.5A CN108101356B (en) | 2017-11-22 | 2017-11-22 | Method and system for online cooling of optical fiber drawn wire |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711169672.5A CN108101356B (en) | 2017-11-22 | 2017-11-22 | Method and system for online cooling of optical fiber drawn wire |
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| CN108101356A CN108101356A (en) | 2018-06-01 |
| CN108101356B true CN108101356B (en) | 2020-01-24 |
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| CN110899921A (en) * | 2019-12-23 | 2020-03-24 | 兰州理工大学 | Welding-following chilling device for controlling welding deformation and welding method |
| CN111907029A (en) * | 2020-07-29 | 2020-11-10 | 安徽集虹材料科技有限公司 | Water-cooling drying integrated device for color masterbatch production |
| CN113725702A (en) * | 2021-08-30 | 2021-11-30 | 安徽长青建筑制品有限公司 | High-stability cooling system of optical fiber laser |
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| JPH0316937A (en) * | 1989-06-13 | 1991-01-24 | Furukawa Electric Co Ltd:The | Production of optical fiber |
| JPH04362038A (en) * | 1991-06-06 | 1992-12-15 | Fujikura Ltd | Optical fiber producing device |
| NZ504479A (en) * | 1997-11-21 | 2003-04-29 | Pirelli Cavi E Sistemi Spa | Method and apparatus for cooling optical fibers |
| CN203256136U (en) * | 2013-04-27 | 2013-10-30 | 江苏亨通光纤科技有限公司 | Online device for cooling optical fibers by hydrogen in fiber drawing process |
| JP2015071505A (en) * | 2013-10-02 | 2015-04-16 | 住友電気工業株式会社 | Manufacturing method and manufacturing apparatus for optical fiber |
| CN105601099A (en) * | 2016-03-25 | 2016-05-25 | 威海威信光纤科技有限公司 | Optical fiber drawing cooling system |
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