CN112592048B

CN112592048B - Graphite piece structure for optical fiber drawing furnace

Info

Publication number: CN112592048B
Application number: CN202011338698.XA
Authority: CN
Inventors: 沈小平; 祝君; 魏文涛; 白晓明
Original assignee: Tongding Interconnection Information Co Ltd
Current assignee: Tongding Interconnection Information Co Ltd
Priority date: 2020-11-25
Filing date: 2020-11-25
Publication date: 2022-08-16
Anticipated expiration: 2040-11-25
Also published as: CN112592048A

Abstract

The utility model relates to a novel graphite spare structure for optical fiber wire drawing furnace, including gas ring, center tube, horse fluorine pipe, heat preservation bowl, wherein gas ring, center tube and horse fluorine pipe are high-purity graphite product, and the heat preservation is the soft felt of graphite, and the heat preservation bowl is the hard felt of graphite. The heat preservation bowl, the horse fluorine pipe, the center tube, the heat preservation, the gas ring are the tube-shape design, through stack in proper order, the equipment is placed on wire drawing stove bottom water board to the cover, heat preservation bowl and heat preservation cover are in the horse fluorine pipe and the center tube outside, play thermal-insulated heat preservation effect, horse fluorine pipe, center tube rely on size, step design to stack, gas ring end opening external diameter slightly is less than the center tube and makes its embedding center tube in, gas ring end opening round is equipped with the equidistance through-hole, the protection gas passes through the through-hole and gets into in the wire drawing stove graphite spare. The graphite piece structure provided by the invention simplifies the cleaning operation difficulty, prolongs the service life of the graphite piece and reduces the cost of protective gas.

Description

Graphite piece structure for optical fiber drawing furnace

Technical Field

The invention relates to the technical field of optical fiber production, in particular to a graphite piece structure for an optical fiber wire drawing furnace.

Background

In the optical fiber production field, optic fibre is obtained by melting optical fiber perform, optical fiber perform melts under certain high temperature condition and forms the silk, form commercial optic fibre after coating through drawing, the optical fiber wire drawing stove is prefabricated stick heating machine, most producers can use the intermediate frequency induction furnace, graphite spare that heats in the wire drawing stove through eddy current effect forms the high temperature region, prefabricated stick that is in the high temperature region can melt gradually, because graphite reacts with oxygen easily under high temperature, can let in a certain amount of protective gas and come isolated air in wire drawing stove graphite spare when producing, the structural design of graphite spare can change the temperature field in the wire drawing stove, different temperature field conditions have great influence to the quality of optical fiber product, if the design does not rationally can reduce the life-span of graphite spare simultaneously.

At present, a graphite piece structure designed by most manufacturers in the industry comprises 6 parts, namely an upper air ring, a lower air ring, a central pipe, a fluorine pipe, a central pipe heat-insulating layer and a fluorine pipe heat-insulating layer, the structure is complex, graphite dust deposition is easy to generate on the outer wall of the upper air ring, the graphite piece is difficult to clean, a drawing furnace needs to be disassembled regularly to take out the graphite piece for cleaning, and meanwhile, due to the structural reason, the upper air ring and the lower air ring are matched to form a flow guide effect, the inner diameter of the center is increased, the inner space of the graphite piece is increased, the heating efficiency is reduced, more protective gas is needed to maintain a temperature field, in addition, in order to reduce the inner diameter of the central pipe, the wall thickness of the upper air ring is designed to be thinner, but in the production process, the upper air ring is most easily contacted with air to cause oxidation loss, and the service life of the upper air ring is far shorter than that of other graphite pieces.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to solve the defects in the prior art, the graphite piece structure for the optical fiber drawing furnace is provided.

The technical scheme adopted by the invention for solving the technical problems is as follows:

the utility model provides an optical fiber is graphite spare structure for wire drawing furnace, its characterized in that, includes gas ring, center tube, horse fluorine pipe, heat preservation bowl, the heat preservation bowl is placed on wire drawing furnace bottom water board, the horse fluorine pipe inserts in the heat preservation bowl, and the edge is placed on wire drawing furnace bottom water board, and lower edge passes heat preservation bowl and wire drawing furnace bottom water board, the center tube is straight tube-shape graphite spare, falls on the horse fluorine pipe, the heat preservation is the soft felt of tube-shape graphite, overlaps in the center tube and the horse fluorine outside of tubes, falls on the heat preservation bowl, the gas ring inlays in the center tube, goes up along falling on wire drawing furnace upper mouth flange water board.

Wherein, the heat preservation bowl is graphite hard felt material, has better thermal-insulated effect, and the inner wall size agrees with the external wall size of horse fluorine pipe basically.

The upper edge of the muffle pipe is provided with a step which mainly plays a role in connecting the central pipe and the extension pipe and has certain influence on the trend of air flow in the graphite piece.

The central tube is a high-purity graphite piece and is a main heating piece, the lower edge of the central tube is provided with a step, and the central tube is matched with the step of the upper opening of the Teflon tube, so that the central tube can be fixed in position and does not deviate or incline.

Wherein, the heat preservation is graphite soft felt material, has better thermal-insulated effect, and the inner wall size agrees with the upper half of center tube and fluorine pipe.

Wherein, the gas ring is high-purity graphite, the outer diameter of the gas ring is matched with the inner diameter of the central tube, the gas ring can be inserted along the inner wall of the central tube, and the upper edge of the gas ring falls on a flange water plate at the upper opening of the wire drawing furnace.

Wherein, evenly distributed along the side on the gas ring is 48 through-holes with the diameter of 1mm for introducing protective gas.

Wherein, the through holes uniformly distributed on the gas ring are horizontal through holes.

The invention has the beneficial effects that: through novel one-piece type gas ring structure, wash the wire drawing stove no longer need unpack the wire drawing stove apart, simplified the operation degree of difficulty and improved the life-span of gas ring, the central tube size and the more reasonable horse fluorine pipe of reducing of being convenient for reduce, reduced the use amount of protective gas in the graphite parts and improved the undulant size in silk footpath of optic fibre, when simplifying the operation degree of difficulty, not only improved the optic fibre quality, reduced certain cost moreover.

Drawings

The technical solution of the present application is further explained below with reference to the drawings and the embodiments.

FIG. 1 is a schematic sectional view showing the whole of the structure of a graphite member for an optical fiber drawing furnace according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view illustrating a gas ring of a graphite member structure for an optical fiber drawing furnace according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a central tube showing a graphite member structure for an optical fiber drawing furnace according to an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a muffle tube showing a structure of a graphite member for an optical fiber drawing furnace according to an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view illustrating an insulating layer of a graphite member structure for an optical fiber drawing furnace according to an embodiment of the present invention;

FIG. 6 is a schematic sectional view of an insulating bowl showing a graphite member structure for an optical fiber drawing furnace according to an embodiment of the present invention.

The reference numbers in the figures are:

1 preform

2 ventilating water plate

3 gas ring

4 center tube

5 insulating layer

6-muffle tube

7 Heat preservation bowl

301 air holes.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the scope of the present application. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art through specific situations.

The technical solutions of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Examples

The present embodiment provides a graphite member structure for an optical fiber drawing furnace, as shown in fig. 1, including:

the device comprises a gas ring 3, a central pipe 4, a Teflon pipe 6, a heat-insulating layer 5 and a heat-insulating bowl 7, wherein the heat-insulating bowl 7 is placed on a water plate at the bottom of the wire drawing furnace; the muffle pipe 6 is inserted into the heat preservation bowl 7, the edge of the muffle pipe is placed on the water plate at the bottom of the wire drawing furnace, and the lower edge of the muffle pipe penetrates through the heat preservation bowl 7 and the water plate at the bottom of the wire drawing furnace; the central tube 4 is a straight cylindrical graphite piece and falls on the fluorine tube 6; the heat-insulating layer 5 is cylindrical, is sleeved outside the central pipe 4 and the fluorine pipe 6 and falls on the heat-insulating bowl 7; the gas ring 3 is embedded in the central pipe 4, and the upper edge of the gas ring falls on a flange water plate at the upper opening of the wire drawing furnace.

The graphite piece structure for the optical fiber drawing furnace in the embodiment is mainly adjusted to the following points:

1. the upper and lower air rings are integrated, so that space is provided for reducing the size of the central pipe, and the difficulty of brushing the furnace is reduced; 2. changing an air inlet mode from the original laminar flow between an upper air ring and a lower air ring to a direct blowing mode; 3. the inner diameter size of the central tube is reduced, and the using amount of protective gas is reduced by reducing the size of the space between the preform and the heating body of the wire drawing furnace; 4. the opening angle of the muffle tube is reduced, the muffle tube structure is more suitable for the reducing shape of the prefabricated rod, and the fluctuation size of bare fibers is improved.

Preferably, in the graphite piece structure for the optical fiber drawing furnace of the embodiment, the heat preservation bowl 7 is made of a graphite hard felt material, and the size of the inner wall of the heat preservation bowl is matched with the size of the outer wall of the muffle tube 6.

Preferably, in the graphite piece structure for the optical fiber drawing furnace of the embodiment, the muffle tube 6 is a high-purity graphite piece, and the upper edge of the muffle tube is provided with a step for connecting the central tube 4 and the extension tube and influencing the direction of the air flow in the graphite piece.

Preferably, in the graphite piece structure for the optical fiber drawing furnace of the present embodiment, the central tube 4 is a high-purity graphite piece, and the lower edge of the central tube is provided with a step, which is matched with the step of the upper opening of the teflon tube 6, so that the central tube can be fixed in position without deviation or inclination.

Preferably, in the graphite part structure for the optical fiber drawing furnace of the embodiment, the insulating layer 5 is made of a graphite soft felt material, and the size of the inner wall of the insulating layer is matched with the central pipe 4 and the upper half part of the fluorine pipe 6.

Preferably, in the graphite piece structure for the optical fiber drawing furnace of the embodiment, the gas ring 3 is made of high-purity graphite, the outer diameter of the gas ring is matched with the inner diameter of the central tube 4, the gas ring can be inserted into the inner wall of the central tube 4, and the upper edge of the gas ring falls on the flange water plate at the upper opening of the drawing furnace.

Preferably, in the graphite piece structure for an optical fiber drawing furnace of the present embodiment, 48 through holes with a diameter of 1mm are uniformly distributed on the gas ring 3 along the side surface for introducing shielding gas.

Preferably, in the graphite piece structure for an optical fiber drawing furnace according to the present embodiment, the through holes uniformly distributed on the gas ring 3 are horizontal through holes.

The graphite piece structure for the optical fiber drawing furnace in the embodiment is characterized in that during installation, the heat preservation bowl 7 is placed on a water plate at the bottom of the drawing furnace, the hollow circle centers of the heat preservation bowl and the water plate at the bottom are located on the same longitudinal axis, then the lower edge of the fluorine tube 6 penetrates through the heat preservation bowl and the water plate at the bottom of the drawing furnace, the edge of the fluorine tube 6 can be placed on the water plate at the bottom of the drawing furnace, the central tube 4 is continuously installed, the lower edge of the central tube corresponds to the upper edge of the fluorine tube 6 along the step, the position of the central tube 4 is fixed without lateral movement, then the central tube 5 is sleeved with the heat preservation layer until the heat preservation bowl 7 is directly inserted until the heat preservation bowl is contacted, then after the two water plates of the drawing furnace are installed, the gas ring 3 is inserted along the inner wall of the central tube 4, the upper edge of the gas ring 3 is placed on the water plate of the drawing furnace, and finally the other water plate 2 for ventilating the drawing furnace is installed.

The heat preservation 5 and the heat preservation bowl 7 are graphite materials, and the central pipe 4 and the fluorine pipe 6 are wrapped, so that heat loss can be greatly reduced due to the heat insulation characteristic, wherein the heat preservation 5 is a graphite soft felt, and the heat preservation bowl 7 is a graphite hard felt.

In the use process, after external protective gas is introduced into the water plate for ventilation of the wire drawing furnace through a pipeline, the external protective gas enters the gas ring along the inner gas hole 301 after being shunted, and finally enters the graphite piece.

During production, protective gas is introduced firstly, the prefabricated rod 1 is inserted into the wire drawing furnace, the upper opening of the wire drawing furnace is sealed, a power supply of the wire drawing furnace is opened, the graphite central tube 4 is heated by using the eddy current effect, the protective gas flows downwards along the prefabricated rod 1 and the gas ring 3, and the protective gas flows downwards along the space between the central tube 4 and is discharged out of the wire drawing furnace after passing through the muffle tube 6 and the annealing tube, the heat conduction effect of the protective gas and the design structure inside the graphite piece can form a high-efficiency and stable temperature field, when the temperature in the wire drawing furnace reaches a certain degree, the prefabricated rod 1 is gradually melted, under the influence of gravity, the molten quartz prefabricated rod hangs downwards, and the quartz glass is drawn by the high-speed rotation of the traction wheel to form the optical fiber with the target diameter.

In light of the foregoing description of the preferred embodiments according to the present application, it is to be understood that various changes and modifications may be made without departing from the spirit and scope of the invention. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of the claims.

Claims

1. A graphite part structure for an optical fiber drawing furnace is characterized by comprising a gas ring (3), a central pipe (4), a fluorine pipe (6), a heat-insulating layer (5) and a heat-insulating bowl (7), wherein the heat-insulating bowl (7) is placed on a water plate at the bottom of the drawing furnace; the muffle pipe (6) is inserted into the heat preservation bowl (7), the edge of the muffle pipe is placed on the water plate at the bottom of the wire drawing furnace, and the lower edge of the muffle pipe penetrates through the heat preservation bowl (7) and the water plate at the bottom of the wire drawing furnace; the central pipe (4) is a straight cylindrical graphite piece and falls on the fluorine pipe (6); the heat-insulating layer (5) is cylindrical, is sleeved outside the central pipe (4) and the muffle pipe (6) and falls on the heat-insulating bowl (7); the gas ring (3) is embedded in the central pipe (4), and the upper edge of the gas ring falls on a flange water plate at the upper opening of the wire drawing furnace;

the heat preservation bowl (7) is made of graphite hard felt, and the size of the inner wall of the heat preservation bowl is matched with that of the outer wall of the muffle pipe (6);

the muffle pipe (6) is a high-purity graphite piece, and the upper edge of the muffle pipe is provided with a step for connecting the central pipe (4) and the extension pipe and influencing the trend of air flow in the graphite piece.

2. The graphite member structure for an optical fiber drawing furnace according to claim 1, wherein the central tube (4) is a high purity graphite member, and the lower edge thereof is provided with a step which is engaged with the step of the upper opening of the muffle tube (6) to allow the fixing thereof without deviation or inclination.

3. The graphite piece structure for the optical fiber drawing furnace according to claim 2, wherein the heat insulating layer (5) is made of graphite soft felt, and the size of the inner wall of the heat insulating layer is matched with the upper half parts of the central tube (4) and the fluorine tube (6).

4. The graphite piece structure for the optical fiber drawing furnace according to claim 3, wherein the gas ring (3) is made of high-purity graphite, the outer diameter of the gas ring is matched with the inner diameter of the central tube (4), the gas ring can be inserted along the inner wall of the central tube (4), and the upper edge of the gas ring falls on a flange water plate at the upper opening of the drawing furnace.

5. The graphite member structure for an optical fiber drawing furnace according to any one of claims 1 to 4, wherein 48 through holes having a diameter of 1mm are uniformly distributed along the side surface of the gas ring (3) for introducing a shielding gas.

6. The graphite member structure for an optical fiber drawing furnace according to claim 5, wherein the through holes uniformly distributed on the gas ring (3) are horizontal through holes.