• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention discloses an arrangement for drawing optical fibers. The arrangement comprises a protective jacket cylinder and a cover. The protective jacket cylinder comprises a frustoconical protective jacket section (3) which is located at the lowermost area of the protective jacket cylinder and within which a frustoconical cavity (5) penetrating from top to bottom is provided, which has a base and a top surface, the base being larger than the top surface The protective jacket cylinder is arranged on the top of the lid and presses against the lid under the action of gravity, the top of the lid being provided with a circumferential washer groove (7) which is located at the contact point between the lid and the base of the frustoconical Protective jacket section (3) is located and inside which a washer is installed, the top of the cover being provided with a circumferential oil collecting groove (8) which extends at a transition between an inclined downwardly extending inner wall of the frustoconical protective jacket section (5) and the cover, so that the oil adhering to the inclined inner wall is collected in the oil collecting groove (8) under the action of gravity, the washer groove (7) having a larger circumference than the oil collecting groove (8) and spaced from the oil collecting groove is. In the present invention, the probability of an out-of-round cladding layer when drawing a preform is reduced and thus the out-of-roundness of the cladding layer of optical fibers is reduced.
    公开号:CH715731B1
    申请号:CH01294/19
    申请日:2019-08-22
    公开日:2021-02-15
    发明作者:Zhao Guo；Wang Xiaoquan
    申请人:Nanjing Wasin Fujikura Optical Communication Ltd；
    IPC主号:
    专利说明:

    FIELD OF THE INVENTION
    The present invention relates to an arrangement for drawing optical fibers.
    STATE OF THE ART
    A drawing and heating furnace for optical fibers is a heating device with which a preform is processed after heating and melting by drawing into thin optical fibers that meet the requirement. An existing protective jacket and cover structure of a drawing and heating furnace for optical fibers comprises a protective jacket cylinder and a cover, as can be seen from FIGS. 1 and 2. The interior of the protective jacket cylinder is cylindrical and when heated, the washer between the protective jacket cylinder and the cover of the heating furnace slightly separates oil, so that the jacket layer of a large number of optical fibers has an excessive ovality. In view of the increasing length of the preform used for optical fibers (referred to as preform for short) and the ever-increasing continuous operating time in the production of optical fibers, the safety capability of existing washers for continuous use at high temperatures cannot be guaranteed. Over time, oil is excreted, which evaporates at a high temperature and spreads into the preform, so that when the preform is pulled, the outer layer becomes slightly out of round. Furthermore, cooled oil flows vertically downwards on the inner wall of the protective jacket cylinder and drips off as oil contamination into the heating furnace, which leads to out-of-roundness of the jacket layer when the preform is drawn. In view of the lack of potential for improvement with regard to the material of the washer, the structure of the existing protective jacket and cover structure must be optimized to improve quality, in order to reduce the out-of-roundness of the jacket layer of optical fibers.
    DISCLOSURE OF THE INVENTION
    The present invention is based on the object, in view of the disadvantages in the prior art, an arrangement for drawing optical fibers comprising a protective jacket. To provide a cylinder and a cover, in which by changing the structure of existing protective jacket and cover structures, the separation of oil from washers is effectively reduced and, even if oily volatile substances are present, these collect on the inclined inner wall of the protective jacket cylinder in the oil collecting groove instead of immediately after cooling to drain in the heating oven. This reduces the probability of an out-of-round cladding layer when drawing a preform and thus reduces the out-of-roundness of the cladding layer of optical fibers.
    According to the invention, the object is achieved by the following configuration: An arrangement for pulling optical fibers comprises a protective jacket cylinder and a cover. The protective jacket cylinder comprises a frustoconical protective jacket section which is located at a lowermost area of the protective jacket cylinder and within which a truncated conical cavity penetrating from top to bottom is provided, which has a base and a top surface, the base being larger than the top surface, the protective jacket cylinder is arranged on an upper side of the lid and presses against the lid under the action of gravity, the upper side of the lid being provided with a circumferential washer groove, which is located at the contact point between the lid and the base of the frustoconical protective jacket section and inside which a washer is installed is, wherein the top of the cover is provided with a circumferential oil collecting groove, which extends at a transition between an inclined downwardly extending inner wall of the frustoconical protective jacket section and the cover is located so that the oil adhering to the inclined inner wall is collected under the action of gravity in the oil collecting groove, the washer groove has a larger circumference than the oil collecting groove and is spaced apart from the oil collecting groove.
    In a further development of the present invention it is provided that the protective jacket cylinder further comprises a cylindrical protective jacket section, the base surface of which is firmly connected to the top surface of the frustoconical protective jacket section.
    In a further development of the present invention it is provided that within the cylindrical protective jacket section a running along the longitudinal direction of the cylindrical protective jacket cylinder and penetrating cylindrical cavity is provided, the base of which is the top surface of the frustoconical cavity within the frustoconical protective jacket section and is aligned, wherein the cylindrical protective casing section and the frustoconical protective casing section are formed in one piece.
    In a further development of the present invention it is provided that in the center of the lid a through opening for performing a preform is provided, wherein a surface of the through opening is smaller than the base area of the frustoconical cavity within the frustoconical protective jacket portion.
    In a development of the present invention it is provided that the top of the lid is provided with a water inlet and a water outlet and a cooling water circuit chamber is provided within the lid, which is connected to the water inlet and the water outlet and within the flowing cooling water is provided which is circulated for use via an external circulatory system.
    In one embodiment it is provided that the cooling water has a flow rate of 18 to 20L / min and a temperature of 16 to 23 degrees Celsius.
    The present invention is advantageously characterized in that the inner cylindrical structure in the lower region of the protective jacket cylinder is replaced by a frustoconical variant in the existing configuration, so that the inner wall of the protective jacket cylinder is inclined and thus the cooling space is enlarged. In addition, the washer located on the cover is further spaced from the diameter of the preform compared to the prior art and therefore absorbs less heat, which reduces the excretion of oil and the spread of oil into the preform, which leads to reduced ovality of the cladding layer of optical fibers contributes. Even if oily volatile substances are present, they collect after cooling on the inclined inner wall of the protective jacket cylinder in the oil collecting groove instead of dripping directly into the heating furnace, which avoids a non-circular jacket layer of the optical fibers. In addition, the washer and the oil collecting groove can be cleaned regularly in order to improve the quality of the optical fibers and to reduce the ovality of the cladding layer of the optical fibers.
    DISCLOSURE OF THE INVENTION
    [0011] Show therein
    [0012] FIG. 1 shows a protective jacket cylinder structure in the prior art,
    [0013] FIG. 2 shows a cover structure in the prior art,
    3 shows the protective jacket cylinder structure according to the invention,
    4 shows the cover structure according to the invention,
    [0016] FIG. 5 shows the protective jacket and cover structure according to the invention.
    CONCRETE EMBODIMENTS
    Specific embodiments of the present invention are described in more detail below with reference to FIGS. 1 to 5: As can be seen from FIGS. 1 and 2, the interior of the protective jacket cylinder 1 in a drawing and heating furnace for optical fibers is cylindrical in the prior art and a washer is provided within a washer groove 7 of a cover 6, which is located in the vicinity of a preform. As the continuous operating time becomes longer and longer when optical fibers are heated, the washer easily separates out oil, which then evaporates and penetrates into the preform, which leads to an out-of-round outer layer of the optical fibers. Furthermore, cooled oil flows vertically downwards on the inner wall of the cylindrical protective jacket cylinder 1 and drips off as oil contamination into the heating furnace, which leads to the jacket layer being out of round when the preform is drawn.
    By optimizing based on the prior art, the present embodiment proposes a novel protective jacket and lid structure of a drawing and heating furnace for optical fibers that includes a protective jacket cylinder 1 and a lid 6. As can be seen from FIGS. 3 and 4, the protective jacket cylinder 1 is a preform protective jacket cylinder and comprises a cylindrical protective jacket section 2 and a frustoconical protective jacket section 3. Inside the cylindrical protective jacket section 2, a cylindrical cavity 4 extending and penetrating along the length is provided. Within the frustoconical protective jacket section 3, a frustoconical cavity 5 penetrating from top to bottom is provided. The lower surface of the cylindrical cavity 4 resembles the upper surface of the frustoconical cavity 5, while the lower surface of the frustoconical cavity 5 is larger than its upper surface. The lower surface of the cylindrical protective jacket section 2 is fixedly connected to the upper surface of the frustoconical protective jacket section 3, and the lower surface of the cylindrical cavity 4 is aligned with the upper surface of the frustoconical cavity 5. The cylindrical protective jacket section 2 and the frustoconical protective jacket section 3 are fastened to one another in one piece. In the middle of the cover 6, a through opening 9 is provided for passing a preform. The protective jacket cylinder 1 is arranged on the upper surface of the cover 6, which is provided with a circumferential washer groove 7, which is located at the contact point between the cover 6 and the lower surface of the frustoconical protective jacket portion 3 and inside which a washer is installed. Under the action of gravity, the protective jacket cylinder 1 is pressed firmly against the cover 6 and is in tight contact with the washer. The upper surface of the through opening 9 is smaller than the lower surface of the cylindrical cavity 4 of the frustoconical protective jacket section 3. The upper surface of the cover 6 is provided with a circumferential oil collecting groove 8, which is located at a point where the inclined inner wall of the frustoconical Protective jacket section 3 extends downward, so that the oil adhering to the inclined inner wall is collected downward into the oil collecting groove 8. The washer groove 7 is located on the outer side of the oil collecting groove 8.
    The surface of the cover 6 is provided with a water inlet and a water outlet and within the cover 6 a cooling water circuit chamber is provided, which is connected to the water inlet and the water outlet and is provided within the flowing cooling water 10, which is via a external circulatory system is circulated for use.
    In the present embodiment, a large preform with a drawing length of 1500 to 2000 km is used. The flow rate of the cooling water in the cover 6 is between 18 and 20 L / min and the temperature of the cooling water is set to 16 to 23 degrees Celsius. In the present embodiment, the protective jacket cylinder 1 and the cover 6 of the heating furnace are cleaned after four to five preforms have been melted and the focus is on the washer and the oil collecting groove 8 during cleaning to reduce the out-of-roundness of the jacket layer of the optical fibers.
    In the present invention, the inner cylindrical structure in the lower region of the protective jacket cylinder 1 is replaced by a frustoconical variant in the existing configuration, so that the inner wall of the protective jacket cylinder 1 is inclined and thus the cooling space is enlarged. In addition, the washer located on the cover 6 is arranged at a greater distance from the diameter of the preform compared to the prior art and therefore absorbs less heat, which reduces the excretion of oil and largely prevents oil from dripping off. Even if oily volatile substances are present, these collect on the inclined wall in the oil collecting groove 8 after cooling, instead of dripping off directly into the heating furnace. In the present exemplary embodiment, the protective jacket cylinder 1 and the cover 6, in particular the washer and the oil collecting groove 8, should also be cleaned regularly in order to improve the quality of the optical fibers and to reduce the ovality of the jacket layer of the optical fibers. With the present invention, a substantial non-conformity due to non-circular cladding layer of the optical fibers can be reduced and the good fraction rate of the optical fibers can be increased by optimizing the construction of the cover of a drawing and heating furnace for optical fibers and preventing the preform from being contaminated by Washer drained oil is reduced.
    权利要求:
    Claims (5)
    [1]
    1. An arrangement for pulling optical fibers, comprising a protective jacket cylinder (1) and a cover (6), characterized in that the protective jacket cylinder (1) comprises a frustoconical protective jacket section (3) which extends at a lowermost area of the protective jacket cylinder (1) is located and within which a frustoconical cavity (5) penetrating from top to bottom is provided, which has a base and a top surface, the base surface being larger than the top surface, the protective jacket cylinder (1) being arranged on an upper side of the cover (6) and presses against the cover (6) under the action of gravity, the top of the cover (6) being provided with a circumferential washer groove (7) which is located at the contact point between the cover (6) and the base of the frustoconical protective jacket section ( 3) is located and inside which a washer is installed, the top of the cover (6) with a circulation ends oil collecting groove (8) is provided, which is located at a transition between an inclined downwardly extending inner wall of the frustoconical protective jacket section (3) and the cover (6), so that oil adhering to the inclined inner wall under the action of gravity in the oil collecting groove (8) is collected, the washer groove (7) has a larger circumference than the oil collecting groove (8) and is spaced apart from the oil collecting groove (8).
    [2]
    2. Arrangement according to claim 1, characterized in that the protective jacket cylinder (1) further comprises a cylindrical protective jacket section (2), the base surface of which is firmly connected to the top surface of the frustoconical protective jacket section (3).
    [3]
    3. Arrangement according to claim 2, characterized in that within the cylindrical protective jacket portion (2) a along the longitudinal direction of the cylindrical protective jacket cylinder (2) extending and penetrating cylindrical cavity (4) is provided, the base of which is the top surface of the frustoconical cavity (5) inside of the frustoconical protective casing section (3) and is aligned therewith, the cylindrical protective casing section (2) and the frustoconical protective casing section (3) being formed in one piece.
    [4]
    4. Arrangement according to claim 1, characterized in that in the middle of the lid (6) a through opening (9) for passing a preform is provided, the area of the through opening (9) smaller than the base area of the frustoconical cavity (5) inside of the frustoconical protective jacket section (3).
    [5]
    5. Arrangement according to claim 4, characterized in that the top of the lid (6) is provided with a water inlet and a water outlet and a cooling water circuit chamber is provided within the lid (6), which is connected to the water inlet and the water outlet and inside which flowing cooling water (10) is provided, which can be circulated via an external circulatory system.
    类似技术:
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    DE19921290B4|2004-05-06|Device for manufacturing glass tubes
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    同族专利:
    公开号 | 公开日
    WO2020107961A1|2020-06-04|
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    CN109264986B|2019-03-29|
    引用文献:
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    GB503369A|1937-05-25|1939-04-05|Corning Glass Works|Process and apparatus for the manufacture of foliated glass and product produced thereby|
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    CN205917171U|2016-08-26|2017-02-01|江苏富春江光电有限公司|Air sealer of optical -fiber wiredrawing furnace|
    CN206289171U|2016-12-16|2017-06-30|青海中利光纤技术有限公司|The water-cooling air-sealing device of fibre drawing furnace|
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    CN108409130A|2018-05-21|2018-08-17|江苏亨通光纤科技有限公司|Drawing optical fibers annealing device|
    CN109264986B|2018-11-26|2019-03-29|南京华信藤仓光通信有限公司|A kind of sheath covering plate structure of optical fiber drawing heating furnace|CN109264986B|2018-11-26|2019-03-29|南京华信藤仓光通信有限公司|A kind of sheath covering plate structure of optical fiber drawing heating furnace|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN201811413823.1A|CN109264986B|2018-11-26|2018-11-26|A kind of sheath covering plate structure of optical fiber drawing heating furnace|
    PCT/CN2019/102007|WO2020107961A1|2018-11-26|2019-08-22|Sheath cover structure of optical fiber wire drawing furnace|
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