Blast lamp suitable for VAD deposition

Abstract

The invention discloses a blast lamp suitable for VAD deposition, wherein the blast lamp comprises a lamp body; the lamp body is provided with a slotted feed pore and multi-layer annular gas pores around the outer side of the feed pore; the shape of the multi-layer annular gas pores is matched with the shape of the feed pore; the multi-layer annular gas pores include inner-layer isolation gas pores, inner-layer flame pores, outer-layer flame pores and outer-layer isolation gas pores arranged sequentially from inside to outside; the inner-layer flame pores include inner-layer hydrogen pores andinner-layer oxygen pores, and the outer-layer flame pores include outer-layer hydrogen pores and outer-layer oxygen pores; the feed pore, the inner-layer hydrogen pores, the inner-layer oxygen pores,the outer-layer hydrogen pores and the outer-layer oxygen pores are separated to form multiple branch pores respectively; the branch pores, the inner-layer isolation gas pores and the outer-layer isolation gas pores are connected with a gas intake pipeline, and the gas intake pipeline is provided with a flow regulating valve. Continuous regional deposition is adopted, the deposition end face is more smooth and uniform, and the temperature control of the deposition end face is facilitated. With regulation of the hydrogen flow rate in different areas of the outer layer, the temperature field can be uniformed and the cracking and fracture problems of powder rods are reduced.

Description

Technical field [0001] The invention relates to the technical field of optical fiber manufacturing, in particular to a torch suitable for VAD deposition. Background technique [0002] In recent years, with the rapid development of information technology, the general public's demand for data services has continued to increase, and it is particularly important to accelerate the implementation of the "fiber to the home" strategy. The Ministry of Industry and Information Technology emphasized that it will further increase the implementation of the "Broadband China" strategy in the future. As an important information infrastructure, optical fiber, optical cable and optical communication equipment have ushered in a new wave of development. [0003] Optical fiber preform is an important basic material for manufacturing optical fibers and cables, and is a key core technology in the optical fiber production process. At present, the domestic processes for preparing preforms mainly include ...

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Problems solved by technology

[0004] In the prior art, multi-point deposition is usually used, that is, multiple torches are used for deposition. However, when multi-point deposition is used, the raw material gas deposition flames formed by each torch are discontinuous, and the powder sticks will be damaged due to the powder sticks during the deposition process. Due to factors such as temperature fluctuations on the end surface, uneven density of powder rods, and internal stress, cracking and fractures occur, and the deposition efficiency of germanium dioxide is not high.

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