CN209778657U - Use H2Optical fiber drawing heating furnace device - Google Patents
Use H2Optical fiber drawing heating furnace device Download PDFInfo
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- CN209778657U CN209778657U CN201822256853.8U CN201822256853U CN209778657U CN 209778657 U CN209778657 U CN 209778657U CN 201822256853 U CN201822256853 U CN 201822256853U CN 209778657 U CN209778657 U CN 209778657U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 60
- 238000012681 fiber drawing Methods 0.000 title claims abstract description 41
- 239000007789 gas Substances 0.000 claims abstract description 82
- 239000013307 optical fiber Substances 0.000 claims abstract description 81
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 76
- 239000001257 hydrogen Substances 0.000 claims abstract description 75
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 74
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 229910052786 argon Inorganic materials 0.000 claims abstract description 37
- 238000000137 annealing Methods 0.000 claims abstract description 30
- 238000011084 recovery Methods 0.000 claims abstract description 30
- 238000009826 distribution Methods 0.000 claims abstract description 16
- 239000012528 membrane Substances 0.000 claims description 22
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 7
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 229910052734 helium Inorganic materials 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 239000001307 helium Substances 0.000 abstract description 9
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 abstract description 9
- 239000011261 inert gas Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 239000012535 impurity Substances 0.000 description 10
- 238000005491 wire drawing Methods 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 239000012510 hollow fiber Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The utility model provides a use H2The optical fiber drawing heating furnace device comprises a furnace body, wherein the top of the furnace body is provided with a sealing cylinder which is communicated with each other, and an optical fiber perform fixing and moving unit is arranged in the sealing cylinder; the top of the sealing cylinder is communicated with a gas recovery unit; a heating coil for heating the optical fiber preform is arranged in the furnace body; the bottom of the furnace body is provided with a gas distribution unit and an annealing pipe, the gas distribution unit is communicated with the hydrogen inlet pipeline, and the annealing pipe is communicated with the argon inlet pipeline; the hydrogen inlet pipe is arranged above the argon inlet pipe. Use H of the utility model2The upper part of the optical fiber drawing heating furnace device adopts integral sealing,The lower part adopts inert gas argon to isolate air, so that hydrogen can be safely used, the price of the hydrogen is lower than that of the helium, and the production cost of the optical fiber can be reduced.
Description
Technical Field
The utility model belongs to the optical fiber manufacturing field especially relates to an use H2The optical fiber drawing heating furnace device.
Background
The drawing furnace, an extremely important functional device in optical fiber drawing, is capable of heating a preform, melting the optical fiber preform in the drawing furnace, and forming an optical fiber having a diameter in the range of 125 + -1 μm under a certain drawing condition. In order to prevent the preform from being oxidized in a high temperature environment, it is generally protected by inert gases (He and Ar) which have a high thermal conductivity and also have a function of keeping the temperature field in the furnace stable.
He is a global strategic resource, where the united states is the world's largest country of He production and supply, followed by aley, catal, russia and polish (the five countries mentioned above are known as the five helium countries), and He currently used in our country is mainly imported from the united states, and since nearly 20, the price of helium gas at the us exit is increasing, which makes the production cost of optical fibers also increasing. A new gas is searched for to replace helium to be used in a drawing heating furnace, so that the production cost of the optical fiber can be effectively reduced.
H2Has higher heat conductivity than He, has better heat conductivity, and uses H2he is replaced by H to keep the temperature field in the furnace stable2The wire drawing heating furnace is a flammable and explosive gas, and the wire drawing heating furnace is a high-temperature environment, so that the wire drawing heating furnace has high danger in use.
disclosure of Invention
In view of this, the present invention provides a use H2The optical fiber drawing heating furnace device overcomes the defects of the prior art, adopts hydrogen as heat-conducting gas in the furnace body of the optical fiber drawing heating furnace, and adopts integral sealing and lower upper partand inert gas argon is adopted to isolate air, so that the operation is safe, and the production cost of the optical fiber can be reduced.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
Use H2The optical fiber drawing heating furnace device comprises a furnace body, wherein the top of the furnace body is provided with a sealing cylinder which is communicated with each other, and an optical fiber perform fixing and moving unit is arranged in the sealing cylinder; the top of the sealing cylinder is communicated with a gas recovery unit; a heating coil for heating the optical fiber preform is arranged in the furnace body; the bottom of the furnace body is provided with a gas distribution unit and an annealing pipe, the gas distribution unit is communicated with the hydrogen inlet pipeline, and the annealing pipe is communicated with the argon inlet pipeline; the hydrogen inlet pipe is arranged above the argon inlet pipe.
Further, the gas distribution unit comprises an annular closed cavity; the upper surface edge of the annular closed cavity is provided with a plurality of air outlet holes, and the lower surface of the annular closed cavity is provided with a plurality of air inlet holes; the plurality of air inlets are all communicated with the hydrogen inlet pipeline.
Furthermore, 24 air outlet holes are uniformly distributed on the upper surface of the annular closed cavity along the circumferential direction, and two air inlet holes are formed in the lower surface of the annular closed cavity; a cooling water jacket is arranged outside the furnace body.
furthermore, the annealing pipe and the argon inlet pipeline are arranged in a cross shape; the upper end of the annealing pipe is inserted into the inner circumference of the annular closed cavity, and the annealing pipe and the annular closed cavity are fixedly connected in a sealing way; two ends of the communication part of the argon inlet pipeline and the annealing pipe are both provided with splayed openings.
Further, the lower end of the annealing pipe is provided with H2A concentration monitoring element and a first valve; the first valve is positioned at H2Below the concentration monitoring element.
Further, the top of the sealing cylinder is communicated with a gas recovery unit through a mixed gas pipeline, and a fan and a vacuum pump are installed on the pipeline; the fan is positioned between the sealing cylinder and the vacuum pumping pump, and a second valve is arranged on a pipeline between the vacuum pumping pump and the gas recovery unit.
Further, the optical fiber perform fixing and moving unit comprises a screw rod and a rod hanging platform for mounting the optical fiber perform; the screw rod is arranged along the height direction of the sealing cylinder; the hanging rod platform is arranged on the screw rod and can move up and down along with the rotation of the screw rod; the screw rod is driven by a hand wheel or a motor, and the hand wheel or the motor is arranged outside the sealing cylinder.
Further, the gas recovery unit comprises a filter screen and a hydrogen membrane separator; the filter screen is detachably connected in the mixed gas pipeline, and the hydrogen membrane separator is arranged at the tail end of the mixed gas pipeline; the high-permeation-rate gas outlet of the hydrogen membrane separator is communicated with the hydrogen recovery tank, and the low-permeation-rate gas outlet of the hydrogen membrane separator is communicated with the Ar recovery tank.
Further, the filter screen comprises an upper layer and a lower layer which are connected with each other; the filtering pore diameter of the upper layer is larger than that of the lower layer.
Another object of the present invention is to provide a device for carrying out the method of the present invention2the method for drawing an optical fiber by the optical fiber drawing heating furnace device of (1), wherein the optical fiber is drawn.
In order to achieve the above purpose, the technical scheme of the utility model is realized like this:
Based on use H as above2The method for drawing the optical fiber by using the optical fiber drawing heating furnace device comprises the following steps:
s1: installing the optical fiber preform on the rod hanging platform, closing all valves, and vacuumizing the whole furnace body by using a vacuumizing pump;
S2: heating by a heating coil, introducing hydrogen through a hydrogen pipeline, introducing the hydrogen into the furnace body through a gas distribution unit, and introducing Ar gas from an argon inlet pipeline to avoid hydrogen leakage and external air entering the furnace body;
S3: the lead screw rotates, the rod hanging platform moves downwards, the optical fiber preform rod moves into the furnace body, drawing is started, mixed gas and dust in the furnace body enter a gas recovery unit, the dust is filtered and intercepted by a filter screen, and hydrogen and Ar gas are respectively recovered through respective recovery tanks;
S4: while drawing wire, by using H2Concentration monitoring elementMonitoring the hydrogen concentration in the annealing tube: when H is monitored2When the concentration exceeds the preset value range, alarming is started, meanwhile, the H2 flow is reduced, and the Ar flow is increased; when H is monitored2When the concentration reaches a dangerous value, H is turned off2Inputting, increasing the flow of argon, simultaneously increasing the air suction amount of a fan, stopping drawing, checking whether the device is blocked when the temperature of the furnace body is reduced to normal temperature, and recovering the drawing treatment once cleaning is found;
Preferably, the method also comprises the steps of detecting the concentration of the recovered hydrogen and Ar gas, wherein the concentration reaches the standard and is recycled, and the concentration does not reach the standard and is recycled after secondary purification;
Preferably, in step S1, after vacuum pumping, the vacuum degree in the furnace body is ensured to be at least-1 Bar, and the maximum vacuum degree is-3 Bar;
Preferably, in step S4, H2The preset value of concentration is 25% LEL, H2The dangerous value of concentration is 50% LEL.
Compared with the prior art, the utility model relates to an use H2The optical fiber drawing heating furnace device has the following advantages:
(1) The upper part of the furnace body of the optical fiber drawing heating furnace is integrally sealed, and the lower part of the furnace body of the optical fiber drawing heating furnace is isolated from air by inert gas argon, so that hydrogen can be safely used, the price of the hydrogen is lower than that of the helium, and the production cost of optical fibers can be reduced;
(2) Hydrogen is used as heat-conducting gas in the furnace body of the optical fiber drawing heating furnace, and the heat conductivity coefficient of the hydrogen is higher than that of helium, so that the uniformity of a temperature field in the furnace is improved, the parameters of roundness, polarization mode dispersion, strength and the like of the optical fiber are improved, and the quality of the optical fiber is improved;
(3) The sealing performance is good, and the external air and impurities can be effectively isolated from entering the furnace body of the optical fiber drawing heating furnace; impurities and floating dust generated in the furnace body can be pumped away through the fan;
(4) the gas recovery system is provided, so that hydrogen and argon can be recovered respectively, the hydrogen and the argon can be recycled, the waste of gas emission is reduced, and the production cost is further reduced.
Based on the above-mentioned use H2Optical fiber drawingAdvantages of the method for drawing optical fibers with a heating furnace device over the prior art, and use of H2The optical fiber drawing heating furnace device is basically the same, so the description is omitted.
Drawings
the accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:
FIG. 1 shows an embodiment of the present invention in use H2The structural schematic diagram of the optical fiber drawing heating furnace device of (1);
FIG. 2 shows an embodiment of the present invention in which the device H is used2The simple structure schematic diagram of the gas distribution unit in the optical fiber drawing heating furnace device;
FIG. 3 illustrates an embodiment of the present invention using a tool H2The simple structure schematic diagram of the gas recovery unit in the optical fiber drawing heating furnace device;
FIG. 4 shows an embodiment of the present invention in which the device H is used2The hydrogen membrane separator in the optical fiber drawing heating furnace device is a simple structure schematic diagram.
description of reference numerals:
1-furnace body; 2-optical fiber prefabricated rod; 3-a gas distribution unit; 301-an annular closed cavity; 302-air outlet holes; 4-annealing the tube; 5-hanging the rod platform; 6-sealing the cylinder; 7-a heating coil; 8-a gas recovery unit; 9-hydrogen gas inlet pipe; 10-argon gas entering a pipeline; 11-H2 concentration monitoring element; 12-a first valve; 13-a screw rod; 14-a fan; 15-vacuum pump; 16-a second valve; 18-a filter screen; 19-a hydrogen membrane separator; 1901-high permeation rate gas outlet; 1902-a low permeation rate gas outlet; 1903-hollow fiber membranes; 20-a hydrogen recovery tank; 21-Ar recovery tank.
Detailed Description
it should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. 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 present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in FIG. 1, a use H2The optical fiber drawing heating furnace device comprises a furnace body 1, an annealing pipe 4, a sealing cylinder 6, a vacuum pumping pump 15 and a gas recovery unit 8.
The furnace body 1 is provided with a heating coil 7 therein for heating and melting the optical fiber preform 2. The side wall of the furnace body 1 is externally provided with a cooling water jacket or an interlayer, and the high-temperature furnace body can be cooled by circulating cooling water. The top of the furnace body 1 is provided with a mutually communicated sealing cylinder 6, and an optical fiber perform fixing and moving unit is arranged in the sealing cylinder 6. The optical fiber perform fixing and moving unit comprises a screw rod 13 and a rod hanging platform 5 for installing the optical fiber perform 2; the lead screw 13 is arranged along the height direction of the sealing cylinder 6, the rod hanging platform 5 is connected to the lead screw 13 through threads, the lead screw 13 is driven by a motor, and the motor is arranged outside the sealing cylinder 6 (not shown in a motor drawing). During the use, the excellent process is controlled by hanging excellent platform 5 and reciprocating along with the rotation of lead screw 13 to the excellent entering of optical fiber perform 2, finally accomplishes the optical fiber perform 2 and installs in sealed section of thick bamboo 6 and stretches into the process in furnace body 1 completely. Specifically, under the drive of the motor, the screw rod 13 rotates, and the rod hanging platform 5 rotates along with the screw rod 13 to move up and down.
The hydrogen enters from a hydrogen inlet pipeline 9 below the furnace body 1, and enters into the furnace body 1 after being distributed by a gas distribution unit 3 arranged at the bottom of the furnace body 1. Particularly, gas distribution unit 3 is annular closed cavity 301, and its upper surface has 24 diameters to be 2 mm's venthole 302 along circumference evenly distributed, and the lower surface has two inlet ports to connect hydrogen admission line 9, and hydrogen gets into in the annular closed cavity 301 from hydrogen admission line 9, evenly flows out from venthole 302 through atmospheric pressure, therefore hydrogen can get into in the heating furnace body 1 uniformly, guarantees the homogeneity of the interior gas of furnace body 1, just also can guarantee the homogeneity of warm court. The inner circle of the annular closed cavity 301 in the gas distribution unit 3 is a passage for argon and optical fibers.
An annealing pipe 4 is arranged below the furnace body 1, and the annealing pipe 4 is communicated with an argon inlet pipeline 10. The annealing pipe 4 and the argon inlet pipeline 10 are arranged in a cross shape; the upper end of the annealing pipe 4 is inserted into the inner circumference of the annular closed cavity 301, and the annealing pipe and the annular closed cavity are fixedly connected in a sealing way; the two ends of the connection part of the argon inlet pipeline 10 and the annealing pipe 4 are both provided with splayed openings. During the use, argon gas then gets into from argon gas admission pipe 10, and argon gas admission pipe 10 is "eight" word shape opening with the intercommunication department both ends of annealing pipe 4, and this kind of setting makes the Ar air current can upwards flow and get into the furnace body after this pipeline gets into, and the air circumstance of isolated annealing pipe 4 lower part of downward flow avoids hydrogen to reveal downwards and outside air gets into the stove, takes place combustion explosion.
Annealingthe lower end of the tube 4 is provided with H2A concentration monitoring element 11 (hydrogen concentration detector GT-HYZLG/B manufactured by Shanghai Zhongcheng instruments and meters Co., Ltd.) and a first valve 12, the first valve 12 being located at H2below the concentration monitoring element 11. When in use, the mixture is mixed with H2The concentration monitoring element 11 is electrically connected with the existing automatic control device of the enterprise, H2The concentration monitoring element 11 sets two values, one is an automatic alarm value (25% LEL) and one is an automatic hydrogen off value (50% LEL) (i.e., a dangerous value) when H is monitored2When the concentration exceeds the preset value range, the alarm is started, and H is reduced simultaneously2The flow rate is increased, and the uniformity of the temperature field in the furnace can be ensured by controlling the change of the flow rates of the two gases in the process; when H is monitored2When the concentration reaches a dangerous value, H is automatically closed2Inputting, increasing the flow of argon gas, stopping drawing the wire simultaneously, preventing hydrogen from leaking, when the temperature of the wire drawing furnace is reduced to be close to normal temperature, checking the devices such as the fan 14, the filter screen 18, the hydrogen membrane separator 19 and the like, ensuring that a gas channel of the whole system is not blocked, and restarting a wire drawing program after the gas fluidity is good in the wire drawing process.
The top of the sealing cylinder 6 is connected with a fan 14 through a mixed gas pipeline, the fan 14 is arranged in the sealed pipeline, and the fan 14 can take away hydrogen, argon and floating dust in the furnace body 1 and the sealing cylinder 6 in time. The rear end of the fan 14 is connected with a vacuum pump 15 through another mixed gas pipeline, the mixed gas pipeline at the rear end of the vacuum pump 15 is provided with a second control valve 16, and when the first control valve 12 and the second control valve 16 at the lower end of the annealing pipe 4 are closed, the device is vacuumized, and the sealing performance of the device is checked.
And a gas recovery unit 8 is arranged behind the vacuum pumping pump 15 and is communicated with the vacuum pump through another mixed gas pipeline. The gas recovery unit 8 comprises a filter screen 18 and a hydrogen membrane separator 19; 18 detachable connections of filter screen are in the mist pipeline, and the mode of detachable connection is threaded connection, specifically, and the both ends of filter screen all have the screw thread, can with mist pipeline zonulae occludens, need regularly to dismantle the inspection filter screen state, can install once more after the washing when impurity is more and use. The filter screen comprises an upper layer and a lower layer which are fixedly connected with each other; the filtering pore diameter of the upper layer is larger than that of the lower layer, preferably, the upper layer is a coarse screen, the filtering pore diameter is 100 meshes, and a metal wire mesh with higher strength is adopted for filtering large-particle impurities in the gas; the lower layer is a fine net, the filtering aperture is 325 meshes, and a cotton net is adopted for filtering small-particle impurities. The hydrogen membrane separator 19 is installed at the end of the mixed gas pipeline; the hydrogen membrane separator 19 is a hollow fiber membrane separator, and specifically adopts a hydrogen recovery membrane element produced by the state original technology, and the hydrogen recovery membrane element takes a hollow fiber membrane 1903 as a separation membrane. The hydrogen membrane separator 19 has a hydrogen outlet on the high permeation rate side (i.e., high permeation rate gas outlet 1901) in line communication with the hydrogen recovery tank 20, and an argon outlet on the low permeation rate side (i.e., low permeation rate gas outlet 1902) in line communication with the Ar recovery tank 21. When the device is used, large-particle impurities in the gas are filtered and extracted from the upper layer of the filter screen, small-particle impurities are filtered from the lower layer of the filter screen, and the filtered gas enters the hydrogen membrane separator 19 (shown in figure 4). After the filter screen 18 is used for a long time, impurities can be accumulated to cause the blockage of a mixed gas pipeline, so that the filter screen 18 needs to be cleaned and replaced regularly. The concentration of the recovered hydrogen and argon needs to be detected, the recovered hydrogen and argon can be directly recycled when the concentration reaches the standard, and the recovered hydrogen and argon can be recycled by the wire drawing heating furnace after secondary purification when the concentration does not reach the standard.
the mixed gas pipeline, the hydrogen inlet pipeline, the argon inlet pipeline and other pipelines are all metal pipelines, preferably stainless steel pipelines.
Rubber sealing rings are arranged between the furnace body and the sealing cylinder, between the furnace body and the annealing pipe, between the furnace body and the gas distribution unit, and are tightly connected through screws, so that the sealing performance of each component is ensured. The seam between the control circuit connected to the external environment and the outer wall of the device is sealed by a sealing ring and a sealant, so that the sealing performance of the whole device is guaranteed against being damaged.
based on the above-mentioned use H2The optical fiber drawing heating furnace apparatus for drawing an optical fiber according to (1), wherein the optical fiber drawing heating furnace apparatus using H2 is used for drawing an optical fiber of H2Sealing is performed to prevent leakage thereof. The specific wire drawing method comprises the following steps:
S1: and (3) installing the optical fiber perform 2 on the rod hanging platform 5, closing all valves, vacuumizing the whole device by using a vacuumizing pump 15, and ensuring that the vacuum degree in the furnace body 1 is at least-1 Bar after vacuumizing when needing to be explained.
S2: the heating coil 7 starts to heat, and hydrogen is introduced through the hydrogen pipeline, the hydrogen enters the furnace body 1 through the gas distribution unit 3, and simultaneously, in order to avoid hydrogen leakage and external air entering the furnace body 1, Ar gas is introduced from the argon inlet pipeline 10.
S3: lead screw 13 rotates, hangs excellent platform 5 and moves down, and optical fiber perform 2 moves to furnace body 1 in, begins the wire drawing, and the mist and the dust in the furnace body 1 get into gas recovery unit 8, and the dust is filtered the interception by filter screen 18, and hydrogen and Ar gas are retrieved through respective recovery jar respectively, carry out concentration detection to hydrogen and Ar gas after retrieving afterwards, and concentration is up to standard directly recycles, and concentration is not up to standard to wait to recycle behind the secondary purification. It should be noted that there are manufacturers for purifying helium in the furnace in China, and the secondary purification can be carried out by related manufacturers.
S4: while drawing wire, by using H2The concentration monitoring element 11 monitors the hydrogen concentration in the annealing tube 4: when H is monitored2When the concentration exceeds the preset value by 25 percent LEL, the alarm is started, and H is reduced simultaneously2Increasing the flow of Ar; when H is monitored2When the concentration reaches 50% LEL, H is turned off2Inputting, increasing the flow of argon, simultaneously increasing the air suction amount of a fan, stopping drawing, checking whether the device is blocked when the temperature of the furnace body 1 is reduced to normal temperature, and recovering the drawing treatment once cleaning is found;
use H2The optical fiber drawing heating furnace device can safely use hydrogen in the optical fiber drawing heating furnace, the hydrogen is lower in price than helium, and the production cost of the optical fiber is reduced.
Use H2The device and the method of the optical fiber drawing heating furnace adopt hydrogen as heat-conducting gas in the optical fiber drawing heating furnace, the heat conductivity coefficient of the hydrogen is higher than that of helium, the uniformity of a temperature field in the furnace is favorably improved, the parameters of roundness, polarization mode dispersion, strength and the like of an optical fiber are improved, and the quality of the optical fiber is improvedamount of the compound (A).
Use H2The optical fiber drawing heating furnace device has good sealing performance, and can effectively isolate external air and impurities from entering the optical fiber drawing heating furnace; and impurities and floating dust generated in the furnace can be pumped away through the fan.
Use H2The optical fiber drawing heating furnace device is provided with the gas recovery system, hydrogen and argon can be respectively recovered, the hydrogen and the argon can be recycled, the waste of gas emission is reduced, and the production cost is further reduced.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Use H2The optical fiber drawing heating furnace device comprises a furnace body (1), and is characterized in that: the top of the furnace body (1) is hermetically provided with mutually communicated sealing cylinders (6), and optical fiber perform fixing and moving units are arranged in the sealing cylinders (6); the top of the sealing cylinder (6) is communicated with a gas recovery unit (8); a heating coil (7) for heating the optical fiber preform (2) is arranged in the furnace body (1); the bottom of the furnace body (1) is hermetically provided with a gas distribution unit (3) and an annealing pipe (4), the gas distribution unit (3) is communicated with a hydrogen inlet pipeline (9), and the annealing pipe (4) is communicated with an argon inlet pipeline (10); the hydrogen inlet pipe (9) is arranged above the argon inlet pipe (10).
2. Use H according to claim 12The optical fiber drawing heating furnace device is characterized in that: the gas distribution unit (3) comprises an annular closed cavity (301); a plurality of air outlet holes (302) are formed in the upper surface edge of the annular closed cavity (301), and a plurality of air inlet holes are formed in the lower surface of the annular closed cavity; the plurality of air inlets are all communicated with a hydrogen inlet pipeline (9).
3. Use H according to claim 22The optical fiber drawing heating furnace device is characterized in that: 24 air outlets (302) are uniformly distributed on the upper surface of the annular closed cavity (301) along the circumferential direction, and two air inlets are formed in the lower surface of the annular closed cavity.
4. Use H according to claim 22The optical fiber drawing heating furnace device is characterized in that: the annealing pipe (4) and the argon inlet pipeline (10) are arranged in a cross shape; the upper end of the annealing pipe (4) is inserted into the inner circumference of the annular closed cavity (301), and the annealing pipe and the annular closed cavity are fixedly connected in a sealing way; two ends of the connection part of the argon inlet pipeline (10) and the annealing pipe (4) are both provided with splayed openings.
5. Use H according to claim 42The optical fiber drawing heating furnace device is characterized in that: the lower end of the annealing pipe (4) is provided with H2A concentration monitoring element (11) and a first valve (12); the first valve (12) is located at H2a concentration monitoring element (11).
6. Use H according to claim 12The optical fiber drawing heating furnace device is characterized in that: the top of the sealing cylinder (6) is communicated with a gas recovery unit (8) through a mixed gas pipeline, and a fan (14) and a vacuum pump (15) are installed on the pipeline; the fan (14) is positioned between the sealing cylinder (6) and the vacuum pumping pump (15), and a second valve (16) is arranged on a pipeline between the vacuum pumping pump (15) and the gas recovery unit (8).
7. Use according to claim 6H2The optical fiber drawing heating furnace device is characterized in that: the gas recovery unit (8) comprises a filter screen (18) and a hydrogen membrane separator (19); the filter screen (18) is detachably connected in the mixed gas pipeline, and the hydrogen membrane separator (19) is arranged at the tail end of the mixed gas pipeline; the high-permeation-rate gas outlet (1901) of the hydrogen membrane separator (19) is communicated with the hydrogen recovery tank (20), and the low-permeation-rate gas outlet (1902) of the hydrogen membrane separator (19) is communicated with the Ar recovery tank (21).
8. Use H according to claim 72The optical fiber drawing heating furnace device is characterized in that: the filter screen comprises an upper layer and a lower layer which are connected with each other; the filtering pore diameter of the upper layer is larger than that of the lower layer.
9. Use H according to claim 1 or 62The optical fiber drawing heating furnace device is characterized in that: the optical fiber perform fixing and moving unit comprises a screw rod (13) and a rod hanging platform (5) for installing the optical fiber perform (2); the screw rod (13) is arranged along the height direction of the sealing cylinder (6); the hanging rod platform (5) is arranged on the screw rod (13) and can move up and down along with the rotation of the screw rod (13); the screw rod (13) is driven by a hand wheel or a motor, and the hand wheel or the motor is arranged outside the sealing cylinder (6).
10. use H according to claim 22the optical fiber drawing heating furnace device is characterized in that: and a cooling water jacket is arranged outside the furnace body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822256853.8U CN209778657U (en) | 2018-12-29 | 2018-12-29 | Use H2Optical fiber drawing heating furnace device |
Applications Claiming Priority (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109678339A (en) * | 2018-12-29 | 2019-04-26 | 通鼎互联信息股份有限公司 | It is a kind of to use H2Optical fiber drawing heating furnace device and method |
| CN113402163A (en) * | 2021-07-26 | 2021-09-17 | 郭俊滔 | Airflow stabilizing structure of heating furnace for optical fiber drawing |
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2018
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109678339A (en) * | 2018-12-29 | 2019-04-26 | 通鼎互联信息股份有限公司 | It is a kind of to use H2Optical fiber drawing heating furnace device and method |
| CN109678339B (en) * | 2018-12-29 | 2023-10-20 | 通鼎互联信息股份有限公司 | H is used 2 Optical fiber drawing furnace apparatus and method |
| CN113402163A (en) * | 2021-07-26 | 2021-09-17 | 郭俊滔 | Airflow stabilizing structure of heating furnace for optical fiber drawing |
| CN113402163B (en) * | 2021-07-26 | 2023-08-08 | 郭俊滔 | Heating furnace airflow stabilizing structure for optical fiber drawing |
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