Sintering device for optical fiber preform loose body and application method thereof

Abstract

The invention provides a sintering device for an optical fiber preform loose body. The sintering device comprises a lifting device, a telescopic platform, a rotating device, a guide rod, a furnace core pipe, a guide sleeve and a heater; the guide rod is connected with a flow guide sleeve, a loose body is arranged below the flow guide sleeve, and a necking area of the loose body is completely covered in the flow guide sleeve; the furnace core pipe is arranged below the guide rod, and a heater is arranged outside the furnace core pipe; the flow guide sleeve comprises a conical barrel and a cylindrical base which are distributed up and down, process gas can be covered into the necking area of the loose body, and a plurality of small hollow holes are formed in the surface of the conical barrel. The invention also provides an application method of the sintering device for the loose body of the optical fiber preform. The process dehydroxylation gas completely covers the necking region of theloose body of the optical fiber preform by virtue of the conical flow guide sleeve, so that the chlorine concentration partial pressure of the necking region is guaranteed, the dehydroxylation effectof the necking region is improved, the product quality of the optical fiber is improved, and the manufacturing cost of the optical fiber preform is effectively reduced.

Description

Technical field: [0001] The invention belongs to the technical field of optical fiber prefabricated rod manufacturing, and in particular relates to a sintering device for a loose body of an optical fiber preformed rod and an application method thereof. Background technique: [0002] At present, the domestic optical fiber market is unstable, and the unit price of optical fibers has been declining year after year, greatly reducing the profit margins of major optical fiber companies. Therefore, enterprises can only make up for losses by reducing the manufacturing cost of optical fiber raw materials-optical fiber preforms layer by layer. The most effective way to reduce production costs is to increase the qualified rate of preforms and reduce the scrap rate of semi-finished products in the production process. [0003] In the existing optical fiber preform preparation process, the axial vapor deposition method (VAD) is mostly used to produce the core rod, and then the external va...

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Problems solved by technology

[0005] Chinese patent CN207435310 discloses a sintering device for large-sized loose powder rods of optical fibers. By installing a shroud with a top constriction below the loose powder rods in the furnace core tube, the contact between the loose powder and the dehydroxylation gas is increased, and low Shuifeng optical fiber preform, but this patent mentions that placing the shroud directly in the furnace core tube will cause the following problems in the actual use process: 1. The top necking size of the middle shroud in the furnace core tube is set once, It can only match loose powder rods whose sintering outer diameter is smaller than the size of the constriction; 2. If the loose powder rods crack and fall during the sintering process, it will directly smash the diversion cover at the bottom of the furnace core tube. Due to the limitations of the furnace core tube bottom cleaning will be more troublesome, the equipment can not continue to use

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