WO2020107961A1

WO2020107961A1 - Sheath cover structure of optical fiber wire drawing furnace

Info

Publication number: WO2020107961A1
Application number: PCT/CN2019/102007
Authority: WO
Inventors: 赵国; 王小泉
Original assignee: 南京华信藤仓光通信有限公司
Priority date: 2018-11-26
Filing date: 2019-08-22
Publication date: 2020-06-04
Also published as: CN109264986A; CN109264986B; CH715731B1

Abstract

The present invention discloses a sheath cover structure of an optical fiber wire drawing furnace, comprising a sheath socket and a cover. The sheath socket comprises a cone sheath segment located at the bottom of the sheath socket, and a cone-shaped cavity penetrating from top to bottom is arranged in the interior of the cone sheath segment, the lower surface area of the cone-shaped cavity being larger than the upper surface area thereof. The sheath socket is placed on the upper surface of the cover, and the upper surface of the cover is provided with a round washer groove which is located at the contact position between the cover and the lower surface of the cone sheath segment, a washer being mounted inside the washer groove. The upper surface of the cover is also provided with a round catcher groove which is located at the position where the inner wall slope of the cone sheath segment extends downwards, so that oil on the inner wall slope flows downwards to be collected in the catcher groove. The washer groove is located at the outer side of the catcher groove. The present invention reduces the situation of out-of-round cladding during the wiredrawing of the optical wand, thereby reducing the out-of-round rate of optical cladding.

Description

Sheath cover structure of optical fiber drawing heating furnace

Technical field

The invention relates to an optical fiber drawing heating furnace, in particular to a sheath cover plate structure of the optical fiber drawing heating furnace.

Background technique

The optical fiber drawing heating furnace is a heating device that heats and melts the optical fiber preform to form fine optical fiber fibers with suitable diameters. The sheath cover plate structure of the existing optical fiber drawing heating furnace includes a protective sleeve and a cover plate. As shown in Figure 1 and Figure 2, the inner cavity of the protective sleeve is a straight tube. During the heating process, the sealing ring between the protective sleeve and the heating furnace cover is prone to oil, which causes a large number of fiber claddings to have out-of-roundness. Because the length of the optical fiber preform (referred to as the optical rod) is getting longer and longer, the continuous production time of the optical fiber is getting longer and longer. The original gasket can not guarantee the safe use under continuous high temperature. Grease volatilizes at high temperature and diffuses into the light rod, which leads to the unevenness of the cladding during the drawing process of the light rod, and the grease cooled by the inner wall of the protective sleeve will flow vertically downwards, and the oil stain will drop and the oil stain will drop. Fall into the heating furnace, so that the cladding is not round during the drawing process of the light rod. The best material has been used for the gasket. To improve the quality, only the existing jacket cover structure can be improved to reduce the non-circularity of the fiber cladding.

Summary of the invention

The technical problem to be solved by the present invention is to provide a sheath cover plate structure of an optical fiber drawing heating furnace in view of the above-mentioned deficiencies of the prior art. The sheath cover plate structure of the optical fiber drawing heating furnace changes the original protective sleeve and cover The plate structure effectively reduces the oil leakage phenomenon of the gasket, and even if there are oily volatiles, they will be cooled from the inner wall of the slope of the protective sleeve and collected in the oil collection tank, and will not directly drop into the heating furnace, reducing The cladding is not round during the drawing process of the optical rod, which reduces the non-roundness of the fiber cladding.

To achieve the above technical objectives, the technical solutions adopted by the present invention are:

A sheath cover plate structure of an optical fiber drawing heating furnace includes a protective sleeve and a cover plate. The protective sleeve includes a round table sheath section and the round table sheath section is located at the bottom of the protective sleeve. The inside is provided with a circular truncated-shaped cavity penetrating from top to bottom, the lower surface area of the circular truncated-shaped cavity is larger than the upper surface area of the circular truncated-shaped cavity, the protective sleeve is placed on the upper surface of the cover plate, and a circle is provided on the upper surface of the cover plate A gasket groove, and the gasket groove is located at the contact position of the cover plate and the lower surface of the round table sheath section, a gasket is installed in the gasket groove, a ring of oil collecting groove is provided on the upper surface of the cover plate, and the oil collection groove is located on the sloped inner wall of the round table sheath section The position extending downwards causes the oil on the inner wall of the slope to collect downwardly into the oil collecting groove, and the gasket groove is located outside the oil collecting groove.

As a further improved technical solution of the present invention, the protective sleeve further includes a straight cylindrical sheath segment, and the lower surface of the straight cylindrical sheath segment is fixedly connected to the upper surface of the round platform sheath segment.

As a further improved technical solution of the present invention, a cylindrical cavity extending in the extension direction and penetrating through is provided inside the straight cylindrical sheath section, and the lower surface area of the cylindrical cavity and the circular truncated cone-shaped cavity in the circular truncated sheath section The upper surface area of the cavity is equal, the lower surface of the cylindrical cavity is aligned with the upper surface of the circular table-shaped cavity, and the straight cylinder sheath section and the circular platform sheath section are fixed as an integral mechanism.

As a further improved technical solution of the present invention, the central part of the cover plate is provided with a through groove for inserting the light rod, and the upper surface area of the through groove is smaller than the lower surface area of the cylindrical cavity in the jacket section of the round table.

As a further improved technical solution of the present invention, a water inlet and a water outlet are provided on the surface of the cover plate and a cooling water circulation cavity is provided inside the cover board, and the cooling water circulation cavity is respectively communicated with the water inlet and the water outlet. The cooling water circulation cavity is provided with flowing cooling water and the cooling water is circulated and used through an external circulation system.

As a further improved technical solution of the present invention, the flow rate of cooling water is 18-20 L/min, and the temperature of cooling water is 16-23 degrees.

The beneficial effects of the present invention are as follows: the present invention changes the internal straight tube shape under the existing protective sleeve to a round table shape, and the inner wall of the protective sleeve is sloped, which increases the cooling space, and the gasket on the cover plate is in accordance with the prior art It is farther away from the diameter of the light rod, receives less heat, and there will be less oil escaping, reducing the phenomenon of oil volatilization into the light rod, and reducing the non-circularity of the fiber cladding; The material will also cool down from the slope of the round table-shaped cavity of the protective sleeve and collect in the oil collecting tank, and will not drip into the heating furnace, making the fiber cladding out of round. In addition, the gasket and the oil collecting groove can be cleaned regularly to improve the quality of the optical fiber and reduce the non-circularity of the optical fiber cladding.

BRIEF DESCRIPTION

FIG. 1 is a structure of a protective sleeve in the prior art.

Fig. 2 is a prior art cover structure.

Fig. 3 is a protective sleeve structure of the present invention.

FIG. 4 is the cover plate structure of the present invention.

FIG. 5 is a structure of a sheath cover plate of the present invention.

detailed description

The specific implementation of the present invention will be further described below according to FIGS. 1 to 5:

Referring to FIGS. 1 and 2, the inner cavity of the protective sleeve 1 in the fiber drawing heating furnace in the prior art is a straight cylinder, and a gasket is provided in the gasket groove 7 of the cover plate 6, the gasket is relatively close to the light rod, and the optical fiber is continuous The heating time becomes longer and longer, the gasket is prone to oil and volatilizes into the light rod, resulting in the phenomenon of non-roundness of the optical fiber cladding, and the cooling grease on the inner wall of the straight cylindrical protective sleeve 1 will flow vertically downward and appear oily Dripping phenomenon, dripping into the heating furnace, so that the cladding is not round during the drawing process of the light rod.

This embodiment is improved on the basis of the original, invented a new sheathing cover structure of the fiber drawing heating furnace, including a protective sleeve 1 and a cover 6, as shown in Figures 3 and 4, the protection The sleeve 1 is a light rod protective sleeve, which includes a straight cylindrical sheath section 2 and a round table sheath section 3, and a cylindrical cavity 4 extending in the extension direction and penetrating therethrough is provided inside the straight barrel sheath section 2. The inside of the sheath section 3 is provided with a circular truncated cavity 5 penetrating from top to bottom. The lower surface area of the cylindrical cavity 4 is equal to that of the circular truncated cavity 5. The lower surface area of the circular truncated cavity 5 is greater than The upper surface area of the circular truncated cavity 5, the lower surface of the straight cylindrical sheath section 2 is fixedly connected to the upper surface of the circular truncated sheath section 3 and the lower surface of the cylindrical cavity 4 is aligned with the upper surface of the circular truncated cavity 5, The straight tube sheath section 2 and the round table sheath section 3 are fixed to each other as an integral mechanism. The central part of the cover plate 6 is provided with a through slot 9 for inserting the light rod. The protective sleeve 1 is placed on the upper surface of the cover plate 6 and the cover plate 6 There is a ring of washer grooves 7 on the upper surface and the washer grooves 7 are located at the contact position of the cover plate 6 and the lower surface of the round table sheath section 3. Washers are installed in the washer grooves 7 and the protective sleeve 1 is compressed by its own gravity The cover plate 6 is in sealing contact with the gasket. The upper surface area of the through groove 9 is smaller than the lower surface area of the cylindrical cavity 4 of the round table sheath section 3. The upper surface of the cover plate 6 is provided with a ring of oil collecting grooves 8 and the oil collecting grooves 8 are located The position where the inner wall of the slope of the round table sheath section 3 extends downward so that the oil on the inner wall of the slope is collected downward into the oil collecting groove 8, and the gasket groove 7 is located outside the oil collecting groove 8.

A water inlet and a water outlet are provided on the surface of the cover plate 6 and a cooling water circulation cavity is provided inside the cover plate 6, the cooling water circulation cavity is respectively communicated with the water inlet and the water outlet, and the cooling water circulation cavity is provided with a flow The cooling water 10 and the cooling water 10 are recycled through an external circulation system.

In this embodiment, a large light rod of 1500-2000km is used, the flow rate of the cooling water in the cover 6 is 18-20L/min, and the temperature of the cooling water is set between 16-23 degrees. In this embodiment, each time 4-5 light rods are melted, the protective sleeve 1 and the cover plate 6 of the heating furnace are cleaned once, and emphasis is placed on cleaning the gasket and the oil collecting groove 8 during cleaning to reduce the non-circularity of the optical fiber cladding.

The present invention changes the internal straight cylinder under the existing protective sleeve 1 to a round table shape, and makes the inner wall of the protective sleeve 1 slope-shaped, which increases the cooling space, and the gasket on the cover plate 6 is lighter than the prior art. The diameter of the rod is farther, the heat is less, the phenomenon of oil leakage will be less, and the phenomenon of oil dripping will not occur easily; in addition, even if there are oily volatiles in the future, it will be cooled from the slope and collected in the oil sump 8, Will not drip into the furnace. In this embodiment, the protective sleeve 1 and the cover 6 should be cleaned regularly, and the gasket and the oil collecting groove 8 should be cleaned during cleaning to improve the quality of the optical fiber and reduce the non-circularity of the optical fiber cladding. The invention can reduce the major unqualified phenomenon of the optical fiber due to the out-of-roundness of the core cladding, improve the yield of the optical fiber, mainly improve the cover plate structure of the wire drawing heating furnace, and reduce the contamination of the light rod by the gasket oil.

The scope of protection of the present invention includes but is not limited to the above embodiments. The scope of protection of the present invention is subject to the claims. Any substitution, modification, or improvement made to the technology by those skilled in the art that are easy to think of fall into the scope of the present invention. protected range.

Claims

A sheath cover plate structure of an optical fiber drawing heating furnace includes a protective sleeve and a cover plate, characterized in that the protective sleeve includes a round table sheath section and the round table sheath section is located at the bottom of the protective sleeve, and the round platform The inside of the sheath section is provided with a circular truncated-shaped cavity that runs from top to bottom. The lower surface area of the circular truncated-shaped cavity is larger than the upper surface area of the circular truncated-shaped cavity. The protective sleeve is placed on the upper surface of the cover plate, the cover plate There is a ring of washer groove on the surface and the washer groove is located at the contact position between the cover plate and the lower surface of the round table sheath section. A washer is installed in the washer groove, and a ring of oil collecting groove is provided on the upper surface of the cover plate and the oil collecting groove is located on the round table sheath The position where the inner wall of the slope of the segment extends downward so that the oil on the inner wall of the slope is collected downward into the oil collecting groove, and the gasket groove is located outside the oil collecting groove.
The sheathing cover plate structure of the fiber drawing heating furnace according to claim 1, characterized in that the sheathing sleeve further comprises a straight tube sheathing section, the lower surface of the straight tube sheathing section and the upper part of the round table sheathing section Surface fixed connection.
The sheath cover structure of the fiber drawing heating furnace according to claim 2, wherein a cylindrical cavity extending in the extension direction and penetrating is provided inside the straight sheath segment The lower surface area is equal to the upper surface area of the circular table-shaped cavity in the circular table sheath section, the lower surface of the cylindrical cavity is aligned with the upper surface of the circular table-shaped cavity, and the straight cylindrical jacket section and the circular table jacket section are fixed as an integral mechanism.
The sheathing cover plate structure of the fiber drawing heating furnace according to claim 1, characterized in that: the central part of the cover plate is provided with a through groove for inserting a light rod, and the upper surface area of the through groove is smaller than that of the round table sheath section The lower surface area of the inner cylindrical cavity.
The sheathing cover plate structure of the fiber drawing heating furnace according to claim 4, characterized in that: a water inlet and a water outlet are provided on the surface of the cover plate and a cooling water circulation cavity is provided inside the cover plate, and the cooling water is circulated The cavity is respectively communicated with the water inlet and the water outlet. The cooling water circulation cavity is provided with flowing cooling water and the cooling water is circulated and used through an external circulation system.
The sheathing cover plate structure of the fiber drawing heating furnace according to claim 5, wherein the flow rate of the cooling water is 18-20L/min, and the temperature of the cooling water is 16-23 degrees.