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High-precision resistance type heating furnace for medium-low-temperature optical fiber drawing tower

A wire drawing tower and high-precision technology, applied in the field of resistance heating furnaces, can solve problems such as heating technical errors, and achieve the effects of stable fiber diameter, less fiber crystallization, and simple method

Inactive Publication Date: 2012-11-14
西安思翰光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the manufacturing technology of most multi-component glass optical fibers is not mature. In addition to the difficulty in making the glass block material of the optical fiber preform, the drawing of multi-component glass optical fibers at medium and low temperatures is also a difficult problem in the industry. There is no mature heating technology to ensure that the multi-component Divided glass optical fiber can be successfully drawn with controllable error in the sharp temperature range

Method used

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  • High-precision resistance type heating furnace for medium-low-temperature optical fiber drawing tower
  • High-precision resistance type heating furnace for medium-low-temperature optical fiber drawing tower
  • High-precision resistance type heating furnace for medium-low-temperature optical fiber drawing tower

Examples

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Effect test

Embodiment 1

[0051] Example 1: The heating mode of the small electric rod

[0052] The size of the small electric rod is 25mm in diameter and 30mm in length, the diameter of the quartz tube is 25mm, and the length is 80mm, in order to prevent dust from being adsorbed on the quartz tube. In order to form a sharp temperature heating zone, the present invention uses six heating rods, which are kept sealed to each other, and the heating is uniform. From the hot zone to the heating zone, there is a slow gradient upward trend. Through the temperature control system, vacuum control system, gas circulation system and water cooling system to indirectly "affect" the temperature distribution of the heating zone, forming a center at 600 ℃, the temperature accuracy is ± 0.5 ℃, the preheating zone is 65mm, and the gradient is slowly rising. Heat (from room temperature to maximum temperature), the maximum temperature is 600°C, with the maximum temperature as zero point, the vertical distance (temperatur...

Embodiment 2

[0061] Example 2: Resistance wire heating mode

[0062] The resistance wire is wound around the electric furnace for heating, and the resistance wire with 3 turns is selected according to the required heating temperature. The diameter of the quartz tube is 25 mm and the length is 80 mm, so as to prevent dust from being adsorbed on the preform during the process of drawing the optical fiber. Push a refractory material with a thickness of 55mm around the quartz tube, because the refractory material can transfer heat to the quartz tube to form a preheating zone and a heating zone. Three grooves are carved on the refractory material, and the heating resistance wire is wound on it. The diameter of the wire is controlled according to the temperature range of the heating zone and the central temperature, and asbestos is filled outside the refractory material to keep the temperature stable. Through the temperature control system, vacuum control system, gas circulation system and wate...

Embodiment 3

[0072] Example 3: Heater Ring Mode

[0073] The heating ring is evenly heated, and the casting shape of the heating ring is trapezoidal. The diameter of the quartz tube is selected to be 25mm and the length is 80mm, in order to prevent dust from being adsorbed on the preform during the process of drawing the optical fiber. By calculation, the maximum metal thickness of the heating ring is controlled between 10mm, and the inclination angle of the horn area is 30 degrees. Cotton is filled outside the refractory material to keep the temperature stable. Through the temperature control system, vacuum control system, gas circulation system and water cooling system to indirectly "affect" the temperature distribution of the heating zone, forming a center at 450 ℃, the temperature accuracy is ± 0.5 ℃, the preheating zone is 55mm, and the gradient is slowly rising. Heat (from room temperature to maximum temperature), the maximum temperature is 450°C, with the maximum temperature as ze...

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Abstract

The invention discloses a high-precision resistance type heating furnace for a medium-low-temperature optical fiber drawing tower. The high-precision resistance type heating furnace comprises a sharp temperature heating interval formed by a uniform heating module, an inert protective gas circulating system, a temperature control system, a vacuum system and a water cooling system. Compared with the prior art, the high-precision resistance type heating furnace disclosed by the invention has the characteristics that a small electric rod, a resistance wire and a heating ring form a sharp temperature heating zone and the distance between every two hundred-temperature heating zones is strictly controlled. By using the temperature control system, the vacuum control system, the gas circulating system and the water cooling system, temperature distribution of the heating zone is indirectly influenced and further the heating furnace is promoted to form a sharp heating zone. Therefore, the high-precision resistance type heating furnace has the advantages of adoption of simple method, high precision, wide temperature adjustable range, gradient temperature rise, high temperature control precision, stable optical fiber diameter and long service life; and compared with other heating furnaces, the crystallization degree of optical fibers of the high-precision resistance type heating furnace is low.

Description

technical field [0001] The invention belongs to the field of optical fibers, and relates to a 100-600°C medium-low temperature and high-precision heating furnace for heating optical fiber preforms in the manufacturing process of multi-component glass optical fibers, especially suitable for forming a sharp temperature heating zone for optical fiber preforms Resistance heating furnace. Background technique [0002] Optical fiber is an indispensable material for communication and technological development in the 21st century. Among them, it is mainly used in the field of optical fiber communication, and it is also used in many fields such as medical treatment, military affairs, scientific research, atmospheric monitoring and so on. Optical fiber has important and key applications in national production and national defense construction. It is of great significance to realize the rapid development of science and technology, change the means of communication, and improve the con...

Claims

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Application Information

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IPC IPC(8): C03B37/092
Inventor 林傲祥
Owner 西安思翰光电科技有限公司