Method for connecting high-purity glass tube and metal tube in manufacturing of ultralow-water-peak optical fiber preform
A technology of optical fiber preform and connection method, which is applied in the field of connection of high-purity glass tube and metal tube in the manufacture of ultra-low water peak optical fiber preform, can solve the problems of hidden danger, no description of connection method, easy introduction of water in the sintering system, etc. The effect of reducing moisture content and reasonable process design
Active Publication Date: 2014-12-24
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD +2
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Problems solved by technology
[0006] Chinese invention patents 200410041908.3 and 200610008534.4 describe a sintering device for a soot optical fiber preform. There is a gas port at the bottom of the sintering tube used, but there is no description of the shape design of the gas port and the connection method with the external gas pipeline. At present, manufacturers basically adopt the method of connecting metal tubes and glass tubes with convenient hose transitions, which has buried the hidden danger of moisture being easily introduced into the sintering system, and cannot guarantee the production of optical fiber preforms with ultra-low water peaks.
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[0028] Refer to attached Figure 1~3 , the steps of the connection method between high-purity glass and metal pipe in the manufacture of ultra-low water peak optical fiber preform are as follows:
[0029] 1. Bending the glass tube connected to the air inlet below the glass furnace core tube 1 into a right-angled glass tube 2 by heating with a hydrogen-oxygen flame to facilitate connection with the metal pipe 3. The transformation of the bent tube is divided into three processes: preheating, processing and polishing. With 150~200 L / min H 2 Add 70~90 L / min O 2 Preheat the glass tube connected to the air inlet with a hydrogen-oxygen flame for 8 to 10 minutes. When the surface of the glass tube connected to the air inlet turns white, use a poker to bend the glass tube connected to the air inlet by 90°. h 2 Adjust to 50~80 L / min, O 2 Adjust it to 20-30 L / min and polish in one direction along the direction where the air inlet connects to the end of the glass tube for 5-8 minutes...
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The invention discloses a method for connecting a high-purity glass tube and a metal tube in manufacturing of an ultralow-water-peak optical fiber preform, relating to the field of manufacturing of optical fiber preforms. An oxidation infiltration method is utilized to implement seamless sealing between all the glass tubes and metal tubes in a sintering system to satisfy the production requirements for low-water-peak optical fiber preforms. The method comprises the following steps: (1) bending a gas inlet connecting glass tube below a glass furnace core tube into a right-angled glass tube by heating with oxyhydrogen flame; (2) inspecting the stress and bent tube surface condition; (3) in order to prevent impurities on the metal tube surface from penetrating into the welding joint in the welding process, carry out electrochemical polishing on the internal and external surfaces of the metal tube; (4) sheathing the metal tube subjected to cleaning and surface pretreatment on the end of the cleaned right-angled gas inlet connecting tube; (5) sealing the metal tube and the right-angled glass tube by a gas welding machine; and (6) detecting and rinsing the welded metal glass connecting joint to ensure the sealability and internal cleanness of the tube.
Description
technical field [0001] The method for connecting high-purity glass tubes and metal tubes in the manufacture of ultra-low water peak optical fiber preforms of the present invention relates to the field of optical fiber preforms, and realizes seamless sealing between all glass tubes and metal tubes in the sintering system by adopting the oxidation infiltration method. It replaces the method of connecting metal tubes and glass tubes with flexible tubes (such as: Teflon tubes), reducing the area where moisture can adhere to in the sintering system, thereby reducing the moisture content in the sintering mandrel, and achieving low water peak optical fiber prefabrication rod production requirements. Background technique [0002] Axial Vapor Deposition (VAD) and External Vapor Deposition (OVD) are two commonly used processes for preparing low water peak optical fiber preforms. These two low water peak optical fiber preform manufacturing methods both involve a sintering process, whi...
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IPC IPC(8): C03C29/00
Inventor 谢康周建峰钱宜刚汤明明沈一春薛济萍
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD