Top air sealing device for optical fiber drawing

A furnace top gas and wire drawing technology, which is applied to glass fiber drawing devices, glass manufacturing equipment, manufacturing tools, etc., can solve the problems of increasing tower height and rod feeding stroke, poor consistency and stability, and inconvenient disassembly and assembly of furnaces, etc. problems, to achieve the effect of large diameter variation range, simple structure and low cost of use

CN104445916AActive Publication Date: 2015-03-25JIANGSU FASTEN PHOTONICS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-03-25

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Abstract

The invention relates to a top air sealing device for optical fiber drawing. The top air sealing device is characterized by comprising a self-tightening spring, an annular bottom plate, graphite air sealing rings and an upper pressing ring; a high concave opening and a low concave opening are formed in the annular bottom plate from outside to inside in a sequence; a plurality of equant kerfs are arranged at an inner ring opening of each graphite air sealing ring along the circumference direction; a plurality of graphite air sealing rings are overlapped, and then the outer sides of the graphite air sealing rings are arranged on the high concave opening and compressed through the annular bottom plate; the self-tightening spring is arranged at the low concave opening at the lower side of the inner ring opening of each graphite air sealing ring. The top air sealing device for the optical fiber drawing has the advantages of simple structure, high reliability, convenient maintain and low cost.
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Description

technical field

[0001] The invention relates to a high-temperature gas sealing device, in particular to a furnace top gas sealing device for optical fiber drawing. Background technique

[0002] The process of optical fiber manufacturing is to put the quartz preform into the melting furnace and heat it until the quartz softens, then pull out the thin quartz fiber (that is, the optical fiber) from the bottom of the furnace. The melting furnace uses graphite heating elements, and it is necessary to pass protective gas into the furnace ( Usually argon), so that the flow of argon in the furnace will have a great impact on the optical fiber drawn under the furnace, especially the diameter of the optical fiber, so most of the current optical fiber manufacturers use quartz preforms with uniform diameters (Note: after extension , Finishing, also known as fine rod) drawing, its diameter deviation is usually less than 5mm.

[0003] With the intensification of competition, each optical...

Examples

Embodiment Construction

[0015] Such as figure 1 , figure 2 and image 3 As shown, a furnace top gas sealing device for optical fiber drawing is characterized in that it includes a self-tightening spring 1, an annular bottom plate 2, a graphite gas sealing ring 3 and an upper pressure ring 4; A high notch 2.1 and a low notch 2.2 are provided with several equally divided slits 3.1 along the circumferential direction at the inner ring mouth of the graphite gas seal ring 3; The outer side is arranged on the high notch 2.1 and pressed by the annular bottom plate 2, and the self-tightening spring 1 is arranged at the low notch 2.2 on the lower side of the inner ring mouth of the graphite air seal ring 3.

[0016] The working principle of the present invention is, as Figure 4 As shown, the present invention is installed at the entrance of the furnace roof of the optical fiber drawing furnace 5 through the annular bottom plate 2. During the process of sending the optical fiber preform rod 6 into...