Equipment for depositing optical fiber preforms by OVD (Outside Vapor Deposition) process

Abstract

The invention relates to equipment for depositing optical fiber preforms by an OVD (Outside Vapor Deposition) process. The equipment comprises a deposition chamber, wherein a row of equidistantly-spaced blast lamps are vertically placed at one side of the deposition chamber and are connected with an inlet air flow guiding chamber, an upper rotary collet and a lower rotary collet are correspondingly arranged at the upper and lower sides of the middle part of the deposition chamber, and an air outlet is formed in the other side of the deposition chamber. The equipment is characterized in that upper and lower reciprocating mobile tables are arranged at the upper and lower sides of the middle part of the deposition chamber, horizontal shifting seats are arranged on the upper and lower reciprocating mobile tables, and the upper and lower rotary collets are connected with the horizontal shifting seats. According to the equipment, the deposition of etching powder sticks is more uniform; the blast lamps stay still during blasting, so that the state of flame and air flow in the deposition chamber is kept stable, and the improvement on the accuracy and quality of deposition of the preforms is facilitated; the deposition can achieve a relatively good thermal up-welling effect; and stable advection wind inside the deposition chamber is maintained, and the flame and the advection wind in the chamber are consistent in direction, so that a relatively good shape for the flame can be maintained, divergence is difficult, and the increase of efficiency of deposition is facilitated.

Description

technical field [0001] The invention relates to a device for depositing an optical fiber preform by an OVD process, and belongs to the technical field of optical fiber manufacturing equipment. Background technique [0002] With the development of the optical fiber market, especially in recent years, the price of raw materials has continued to rise, but the price of optical fiber has not risen at the same time. For optical fiber preform manufacturers, it is the general trend to reduce the cost of preform manufacturing and reduce the consumption of raw material gas. [0003] The OVD process, that is, the Outside Vapor Deposition method, is one of the main processes for depositing and manufacturing optical fiber preforms at present. The out-of-tube deposition method has no limitation on the outer diameter of the optical fiber preform, and can produce preforms with larger sizes, so the manufacturing cost can be effectively reduced. The silicon-containing raw material used in th...

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Problems solved by technology

However, moving the torch will cause changes in the state of the flame and air flow in the deposition chamber, which will cause the state of the flame to change accordingly, resulting in unstable process control

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