CN-224226905-U - Optical fiber annealing furnace

CN224226905UCN 224226905 UCN224226905 UCN 224226905UCN-224226905-U

Abstract

The utility model discloses an optical fiber annealing furnace, which belongs to the technical field of optical fiber manufacturing, and comprises a furnace body and a temperature control system, wherein a channel for an optical fiber to pass through is arranged in the middle of the furnace body, an air inlet is arranged at the top of the furnace body, an air outlet is arranged at the bottom of the furnace body, the air inlet and the air outlet are both communicated with a gas protection system through pipelines, the temperature control system comprises a controller and a plurality of temperature sensors, the furnace body is sequentially provided with a plurality of heating areas from top to bottom, each heating area is internally provided with a heating device and a temperature sensor, the heating devices and the temperature sensors are electrically connected with the controller, the optical fiber annealing furnace can monitor and accurately control the temperature in the furnace in real time by arranging the temperature control system, and realize the sectional temperature control of the heating areas of the furnace body by adjusting the heating devices in real time, the temperature control precision is high, the energy consumption is reduced, the strict requirements of high-precision optical fiber manufacturing on temperature control can be met, and the consistency and the stability of the annealing quality of the optical fiber are ensured.

Inventors

ZHANG ZHENGTAO
XIANG LEI
JIA LONG
Xiang Tongwen

Assignees

成都中住光纤有限公司

Dates

Publication Date: 20260512
Application Date: 20250603

Claims (8)

1. The optical fiber annealing furnace is characterized by comprising a furnace body and a temperature control system, wherein a channel for an optical fiber to pass through is arranged in the middle of the furnace body, an air inlet is arranged at the top of the furnace body, an air outlet is arranged at the bottom of the furnace body, and the air inlet and the air outlet are both communicated with a gas protection system through pipelines; the temperature control system comprises a controller and a plurality of temperature sensors; The furnace body has set gradually a plurality of zone of heating from top to bottom, all is provided with a heating device and one in every zone of heating the temperature sensor, heating device and temperature sensor all with controller electric connection.
2. The optical fiber annealing furnace according to claim 1, wherein the furnace body comprises a plurality of mutually spliced furnace body sections, each furnace body section corresponds to one heating area, one heating device is arranged in the wall thickness of each furnace body section, one temperature sensor is arranged on the inner side wall of each furnace body section, the air inlet is arranged on the furnace body section positioned at the top of the plurality of furnace body sections, and the air outlet is arranged on the furnace body section positioned at the bottom of the plurality of furnace body sections.
3. The fiber annealing furnace of claim 2, wherein each furnace body section has an inner and outer double-layer structure, the material of the outer layer of each furnace body section is a high temperature resistant material, and the material of the inner layer is a heat insulating material.
4. The optical fiber annealing furnace according to claim 3, wherein each heating device comprises 4 silicon molybdenum rods, each silicon molybdenum rod is of a U-shaped structure, two end parts of each silicon molybdenum rod are electrically connected with an external power supply through the controller, and the 4 silicon molybdenum rods are vertically arranged and distributed in the wall thickness of a single furnace body section at equal circumferential intervals.
5. The lehr of claim 2 wherein the furnace body comprises three mutually spliced furnace body segments, each of 500mm in length.
6. The optical fiber annealing furnace according to claim 5, wherein the bottom end face of the furnace body section at the top is provided with a mounting groove, the top end face of the furnace body section at the middle is provided with a mounting protrusion, the bottom end face is provided with a mounting groove, the top end face of the furnace body section at the bottom is provided with a mounting protrusion, the mounting groove and the mounting protrusion are mutually matched, the mounting groove and the mounting protrusion are of annular closed structures, and the central lines of the mounting groove and the mounting protrusion coincide with the central line of the furnace body section.
7. The optical fiber annealing furnace according to claim 6, wherein a limiting block is arranged in the installation groove in a protruding mode, and a limiting groove matched with the limiting block is arranged on the installation protrusion.
8. The fiber annealing furnace according to claim 7, wherein the furnace body is of a hollow cylindrical structure, a plurality of locking bolts are arranged at the splicing position of the furnace body sections, the locking bolts are arranged along the radial direction of the furnace body, and the locking bolts penetrate through the mounting grooves and the mounting protrusions at the splicing position of the furnace body sections.

Description

Optical fiber annealing furnace Technical Field The utility model belongs to the technical field of optical fiber manufacturing, and particularly relates to an optical fiber annealing furnace. Background In the field of optical fiber manufacturing, annealing treatment is an important process, and can effectively eliminate internal stress generated in the drawing process of the optical fiber and improve the mechanical property and optical property of the optical fiber. However, conventional lehr designs have a number of problems that are difficult to meet with the requirements of high precision fiber manufacturing. The temperature control system of the conventional annealing furnace is often inaccurate, and the temperature fluctuation range is larger. During the annealing of the fiber, small changes in temperature can have a significant impact on the performance of the fiber. For example, too high a temperature may result in uneven refractive index distribution of the optical fiber and increase loss of signal transmission, while too low a temperature may not completely eliminate internal stress of the optical fiber, affecting mechanical strength and service life of the optical fiber. Because of low temperature control precision, the consistency and stability of the annealing quality of the optical fiber are difficult to ensure by a conventional annealing furnace, so that the manufacturing of the high-precision optical fiber is limited. Conventional annealing furnaces generally adopt a traditional heating mode and structural design, and the energy utilization efficiency is low. During the heating process, a large amount of heat can be dissipated to the surrounding environment through the surface of the furnace body, so that energy is wasted. In addition, the heating element and the heat insulation material of the conventional annealing furnace have limited performances, can not effectively convert electric energy into heat energy and keep the temperature in the furnace stable, and further increase the energy consumption. The high energy consumption not only increases the manufacturing cost of the optical fiber, but also does not accord with the development trend of energy conservation and emission reduction. In summary, the conventional annealing furnace has the problems of low temperature control precision and high energy consumption, and cannot meet the requirements of high-precision optical fiber manufacturing. Disclosure of utility model Aiming at the problems in the prior art, the utility model aims to provide an optical fiber annealing furnace, which solves the problems of low temperature control precision and high energy consumption of the conventional annealing furnace. In order to achieve the above purpose, the utility model adopts the following technical scheme: The optical fiber annealing furnace comprises a furnace body and a temperature control system, wherein a channel for an optical fiber to pass through is arranged in the middle of the furnace body, an air inlet is arranged at the top of the furnace body, an air outlet is arranged at the bottom of the furnace body, and the air inlet and the air outlet are both communicated with a gas protection system through pipelines; the temperature control system comprises a controller and a plurality of temperature sensors; The furnace body has set gradually a plurality of zone of heating from top to bottom, all is provided with a heating device and a temperature sensor in every zone of heating, and heating device and temperature sensor all are connected with the controller electricity. Further, the furnace body comprises a plurality of mutually spliced furnace body sections, each furnace body section corresponds to one heating area, a heating device is arranged in the wall thickness of each furnace body section, a temperature sensor is arranged on the inner side wall of each furnace body section, an air inlet is arranged on the furnace body section positioned at the topmost part among the plurality of furnace body sections, and an air outlet is arranged on the furnace body section positioned at the bottommost part. Further, each furnace body section is of an inner-outer double-layer structure, the outer layer of each furnace body section is made of high-temperature resistant materials, and the inner layer of each furnace body section is made of heat-insulating materials. Further, each heating device comprises 4 silicon-molybdenum rods, each silicon-molybdenum rod is of a U-shaped structure, two end parts of each silicon-molybdenum rod are electrically connected with an external power supply through a controller, and the 4 silicon-molybdenum rods are vertically arranged and evenly distributed in the wall thickness of a single furnace body section at annular intervals. Further, the furnace body comprises three mutually spliced furnace body sections, and the length of each furnace body section is 500mm. Further, the bottom end face of the furnace body secti