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Improved MCVD system tail gas powder removal rod

An improved exhaust gas technology, which is applied in the direction of cleaning hollow objects, cleaning methods and utensils, chemical instruments and methods, etc., can solve the problems of huge fluctuations in the diameter of reaction tubes, reduced product consistency, and reduced product quality, and achieve consistent product quality The effect of guaranteeing stability, reducing the fluctuation of reactant airflow, and increasing the swirling area

Inactive Publication Date: 2020-02-14
CHINA ELECTRONICS TECH GRP NO 46 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation process of the preform, the tail pipe is blocked by the residual material and powder generated by the reaction. Due to the accumulation of reaction tail gas and the thermophoretic effect, the tail pipe is not smooth and blocked, causing pressure and flow fluctuations in the reaction process, resulting in serious deformation of the reaction tube. , resulting in problems such as product quality degradation
The traditional ash removal rod is relatively rigid, and it is not easy to completely scrape the residual powder of the tail pipe. In the MCVD process, it is easy to cause problems such as poor tail pipe and blockage, which makes the diameter of the reaction tube fluctuate greatly during deposition, resulting in consistent products. Therefore, it is necessary to propose a practical and feasible improvement plan for the ash removal rod to improve its flexibility and usability

Method used

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  • Improved MCVD system tail gas powder removal rod
  • Improved MCVD system tail gas powder removal rod
  • Improved MCVD system tail gas powder removal rod

Examples

Experimental program
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Effect test

Embodiment

[0022] Taking the tailpipe with a target inner diameter of 30mm and a length of 800mm as an example, we will illustrate by assembling the ash removal rod that matches it. The specific operation method and steps are as follows:

[0023] (1)) Use a vernier caliper to measure the inner diameter of the tail pipe, and select the rod head 1 with a diameter of 12mm; satisfy the relationship between the diameter of the end of the rod head 1 that is in contact with the inner wall of the tail pipe and the diameter of the inner wall of the tail pipe: 2.5d=D. Its material is Hastelloy alloy.

[0024] (2) Measure the front and rear positions of the expander of the MCVD system and combine the length of the tail pipe to determine the length of the ash removal rod to be 1250mm, and then determine the required shaft length according to the installation position of the rod head 1 and the ash removal rod. The shaft 2 is made of polytetrafluoroethylene.

[0025] (3) Process the air guide groove...

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Abstract

The invention discloses an improved MCVD system tail gas powder removal rod. The improved MCVD system tail gas powder removal rod comprises a rod head and a rod body connected with the rod head; one end of the rod head is provided with four concave air guide grooves around the center axis, and the other end of the rod head is provided with an internal thread; the two ends of each rod body sectionare provided with an external thread and an internal thread, and the multiple rod body sections are connected to form the integrated rod body through the external threads and the internal threads; andthe external thread at one end of the integrated rod body is connected with the internal thread of the rod head so that the tail gas powder removal rod can be formed. According to the improved MCVD system tail gas powder removal rod, in order to avoid the situation that a tail pipe is blocked by residual powder, the phenomenon that the tail pipe is poor in circulation and is blocked is effectively relieved through the improved tail gas powder removal rod, and the capacity of removing the residual powder adhering to the interior of the tail pipe is improved; the powder removal rod is made of Hartz alloy and polytetrafluoroethylen, and the flexibility and corrosion resistance of the rod body are greatly improved; by forming the four concave air guide grooves in the rod head, airflow smoothness of the tail pipe is maintained, the constant tail pressure is ensured, accordingly, reaction pipe deposition is uniform, and the product quality consistency is ensured.

Description

technical field [0001] The invention relates to the technical field of special optical fiber manufacturing, in particular to an improved MCVD (chemical deposition process) system exhaust ash removal rod. Background technique [0002] Special optical fiber is a new type of material for many weapons and equipment, mainly used in high-power fiber lasers, fiber optic gyroscope rings, outer waveguides, and SLD module pigtails. All kinds of special optical fibers are drawn from special optical fiber preforms. During the preparation process of the preform, the tail pipe is blocked by the residual material and powder generated by the reaction. Due to the accumulation of reaction tail gas and the thermophoretic effect, the tail pipe is not smooth and blocked, causing pressure and flow fluctuations in the reaction process, resulting in serious deformation of the reaction tube. , resulting in problems such as product quality degradation. The traditional ash removal rod is relatively ...

Claims

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Application Information

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IPC IPC(8): B08B9/04B08B13/00
CPCB08B9/04B08B13/00
Inventor 韩志辉庞璐张勇王东波王树宇刘笑东
Owner CHINA ELECTRONICS TECH GRP NO 46 RES INST
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