Heating system for dehydrating and sintering loose body

Abstract

The utility model relates to a heating system for dehydrating and sintering a loose body, and the heating system comprises an isolation cylinder which is internally provided with a high-temperature heating area and is provided with a gas inlet, and the gas inlet is used for providing reaction gas for the high-temperature heating area; the rod feeding device is movably arranged in the axis direction of the isolation barrel and is used for moving the loose body to a high-temperature heating area in the isolation barrel; the first heater is arranged on the outer side of the isolation barrel and used for heating the isolation barrel to form a high-temperature heating area; and the second heater is arranged on the rod feeding device and faces one end of the loose body, and the second heater is used for heating the loose body. According to the technical scheme provided by the invention, the difference of geometric dimensions and optical characteristics of each part of the loose body after the dehydration and sintering process of the loose body can be reduced, and the quality of the optical fiber preform is improved.

Description

Technical Field

[0001] The present application relates to the technical field of optical fiber manufacturing, and in particular to a heating system for dehydrating and sintering a loose body. Background Art

[0002] Currently, in the process of producing optical fiber preforms using VAD (Vapour Phase Axial Deposition) or OVD (Outside Chemical Vapor Deposition) methods, an opaque soot is first deposited within a deposition chamber. This soot is then suspended in a high-temperature furnace for dehydration and sintering. In related technologies, the soot is rotated and moved up and down through a high-temperature zone. After undergoing dehydration and sintering stages at different temperatures and gas atmospheres, it ultimately becomes a transparent soot. However, the geometric dimensions and optical properties of each component of the transparent soot vary. Utility Model Content

[0003] Based on the above description, the present application provides a heating system for dehydration and sintering of a soot body to solve the current problem of differences in geometric dimensions and optical properties of various parts of the soot body after the dehydration and sintering process.

[0004] According to one aspect, the present application provides a heating system for dehydration and sintering of a loose body, comprising:

[0005] an isolation cylinder having a high-temperature heating zone therein and an air inlet provided on the isolation cylinder for supplying reaction gas to the high-temperature heating zone;

[0006] A rod feeding device is movably provided along the axis direction of the isolation cylinder, and is used to move the loose body to the high-temperature heating zone in the isolation cylinder;

[0007] a first heater, disposed outside the isolation cylinder, for heating the isolation cylinder to form the high-temperature heating zone; and

[0008] The second heater is arranged on the rod feeding device and is disposed toward one end of the loose body, and the second heater is used to heat the loose body.

[0009] In one or more embodiments, the dimension of the second heater along the first direction is greater than the maximum radial dimension of the loose body;

[0010] The first direction is parallel to the radial direction of the loose body.

[0011] In one or more embodiments, a lifting mechanism is further included, the rod feeding device is connected to the lifting mechanism, and the lifting mechanism is used to pull the rod feeding device to move along the axial direction of the isolation cylinder.

[0012] In one or more embodiments, the rod feeding device includes a main body, a connecting member, and a fixing member sequentially connected along the axial direction of the isolation cylinder;

[0013] The main body is located outside the isolation cylinder and is movably arranged along the axial direction of the isolation cylinder; the second heater is installed on the connecting member and is arranged toward the fixing member; the fixing member is used to fix one end of the loose body.

[0014] In one or more embodiments, the connecting member includes a wire tube and a protective tube sleeved outside the wire tube; the second heater includes a protective shell and a heater body disposed in the protective shell;

[0015] The wire tube and the protection tube pass through the protection shell together; a wire is arranged in the wire tube, and the wire passes through the protection tube and the wire tube, and the wire is electrically connected to the heater body and the power supply.

[0016] In one or more embodiments, the wire tube is provided with an air inlet channel and an exhaust channel, the air inlet channel is used to provide cooling gas into the wire tube, the exhaust channel passes through the protective tube and is connected to the internal space of the protective shell, and the protective shell is provided with an exhaust hole.

[0017] In one or more embodiments, the protection tube and the protection shell are both made of quartz material.

[0018] In one or more embodiments, the first heater is disposed around the isolation cylinder along a circumference of the isolation cylinder.

[0019] In one or more embodiments, the rod feeding device is rotatable so as to rotate the loose body along its axial direction.

[0020] In one or more embodiments, the isolation cylinder is further provided with an exhaust port, and the exhaust port and the air inlet are located on both sides of the first heater along the axial direction of the isolation cylinder.

[0021] Compared with the related art, the technical solution of this application has the following beneficial technical effects:

[0022] When the loose body needs to be dehydrated or sintered, the loose body is fixed on the rod feeding device, the first heater and the second heater are turned on, the isolation cylinder is heated by the first heater to form a high-temperature heating zone, the reaction gas is introduced into the isolation cylinder through the air inlet, and the loose body is moved to the high-temperature heating zone of the isolation cylinder through the rod feeding device. During the movement, the loose body is heated by the second heater. The heating temperature of the second heater can be adjusted according to the vertical distance between the loose body or the second heater and the first heater to compensate for the heat required for the reaction and expand the effective processing range of the loose body per unit time. In particular, the second heater and the loose body keep moving synchronously, which can solve the problem of uneven heating of the part of the loose body near the tail handle end, make the various parts of the loose body react evenly, and reduce the differences in geometric dimensions and optical properties of the loose body in the length direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic structural diagram of a heating system for dehydration and sintering of loose bodies provided in an embodiment of the present application;

[0024] Figure 2 A schematic flow chart of a processing method of a heating system for dehydration and sintering of loose bodies provided in an embodiment of the present application.

[0025] Description of Figure Numbers:

[0026] Heating system 100;

[0027] Isolation cylinder 10, air inlet 10a, exhaust port 10b;

[0028] Rod feeding device 20, main body 21, connecting piece 22, wire tube 221, protective tube 222, fixing piece 23, wire s;

[0029] a first heater 30;

[0030] A second heater 40, a protective shell 41, and a heater body 42;

[0031] Furnace frame 50;

[0032] Loose body I;

[0033] Axial direction L of the isolation cylinder;

[0034] First direction F1. DETAILED DESCRIPTION

[0035] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0037] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0038] A high-temperature heating furnace typically consists of a fixed heater, an insulated tube, a metal frame, and a control system. The heater provides the heat source required for processing. However, due to its fixed position, it can only maintain a high temperature within a certain range of the heater's proximity, while temperatures in other areas decrease as the distance increases. As the soot moves past the heater, only a portion of the soot can be effectively processed. This results in uneven temperature distribution within the furnace, which not only reduces soot processing efficiency but also directly leads to longitudinal variations in the optical fiber preform's geometric dimensions. This also indirectly leads to structural losses near the shank end, as well as longitudinal variations in optical properties such as the mode field diameter and cutoff wavelength.

[0039] At present, in the relevant technology, by increasing the high-temperature zone range of the heater, such as increasing the size of the heater, improving the thermal insulation effect, etc., or adjusting the direction and amount of gas flow in the heating furnace, although there are certain effects, the loose body is always in a state of moving up and down, and the high-temperature zone is always a fixed area, and it is still impossible to fundamentally solve the problem of uneven heating of the loose body.

[0040] Based on this, the embodiments of the present application provide a heating system and a processing method for dehydration and sintering of a loose body, so as to solve the current problem that the geometric dimensions and optical properties of various parts of the loose body are different after the dehydration and sintering process.

[0041] Figure 1 A schematic structural diagram of a heating system for dehydration and sintering of loose bodies provided in an embodiment of the present application is shown. For ease of explanation, this embodiment only shows relevant parts.

[0042] See Figure 1, an embodiment of the present application provides a heating system 100 for dehydration and sintering of a loose body, including an isolation cylinder 10, a rod feeding device 20, a first heater 30 and a second heater 40; a high-temperature heating zone is provided in the isolation cylinder 10, and the isolation cylinder 10 is provided with an air inlet 10a, which is used to provide reaction gas to the high-temperature heating zone; the rod feeding device 20 is movably arranged along the axial direction L of the isolation cylinder 10, and the rod feeding device 20 is used to move the loose body I to the high-temperature heating zone in the isolation cylinder 10; the first heater 30 is arranged on the outside of the isolation cylinder 10, and the first heater 30 is used to heat the isolation cylinder 10 to form a high-temperature heating zone; the second heater 40 is arranged on the rod feeding device 20 and is arranged toward one end of the loose body I, and the second heater 40 is used to heat the loose body I.

[0043] It should be noted that the soot body I has a tail handle end, which is a quartz glass rod. The soot body I is fixed to the rod feeding device 20 by the tail handle end of the soot body I. The second heater 40 is arranged toward one end of the soot body I, that is, the second heater 40 is arranged near the end where the soot body I is fixed to the rod feeding device 20, so that the second heater 40 can heat the portion of the soot body I near the tail handle end to compensate for the heat required for the reaction. In this embodiment, during the movement of the rod feeding device 20 along the axial direction L of the isolation cylinder 10, the soot body I and the second heater 40 can be moved synchronously to extend into or remove from the isolation cylinder 10. In this embodiment, the isolation cylinder 10 is made of quartz glass material and is resistant to high temperatures.

[0044] Specifically, when the loose body I needs to be dehydrated or sintered, the loose body I is fixed on the rod feeding device 20, the first heater 30 and the second heater 40 are turned on, the isolation cylinder 10 is heated by the first heater 30 to form a high-temperature heating zone in the isolation cylinder 10, and the reaction gas is introduced into the isolation cylinder 10 through the air inlet 10a. The loose body I is moved to the high-temperature heating zone of the isolation cylinder 10 by the rod feeding device 20. During the movement, the loose body I is heated by the second heater 40. According to the vertical distance between the loose body I or the second heater 40 and the first heater 30, The heating temperature of the second heater 40 is adjusted to compensate for the heat required for the reaction and expand the effective processing range of the loose body I per unit time. In particular, the second heater 40 and the loose body I keep moving synchronously, which can solve the problem of uneven heating of the part of the loose body I near the tail handle end, make the various parts of the loose body react evenly, reduce the difference in the geometric dimensions of the loose body I in the length direction, and at the same time reduce the loss of the tail structure of the loose body I, the mode field diameter, the cutoff wavelength and other optical properties in the length direction, and shorten the processing time of the loose body I in the dehydration and sintering stages as a whole.

[0045] In some embodiments, the dimension of the second heater 40 along the first direction F1 is larger than the maximum radial dimension of the loose body I; the first direction F1 is parallel to the radial direction of the loose body I. By setting the dimension of the second heater 40 along the first direction F1 to be larger than the maximum radial dimension of the loose body I, the heating range of the second heater 40 on the loose body I is expanded, and the heat required by the loose body I is better compensated.

[0046] In certain embodiments, the heating system 100 of the present application further comprises a lifting mechanism (not shown in the figure), and the rod feeding device 20 is connected to the lifting mechanism, and the lifting mechanism is used to traction the rod feeding device 20 to move along the axial direction L of the isolation cylinder 10. Specifically, a lifting mechanism that is grounded or suspended is set on one side of the isolation cylinder 10, and the rod feeding device 20 is pulled to move back and forth on the axial direction L of the isolation cylinder 10 by the lifting mechanism. Briefly speaking, the lifting mechanism may include components such as a drive motor, a guide rail and a transmission member, and the lifting mechanism can be reasonably set according to conventional mechanical technology. The present embodiment is not limited thereto. In this way, by setting a lifting mechanism to traction the rod feeding device 20 to move along the axial direction L of the isolation cylinder 10, the loose body 1 and the second heater 40 can be moved back and forth along the axial direction L of the isolation cylinder 10, which helps to realize dehydration and sintering process.

[0047] Continue reading Figure 1 In some embodiments, the rod feeding device 20 includes a main body 21, a connecting member 22, and a fixing member 23 connected in sequence along the axial direction L of the isolation cylinder 10; the main body 21 is located outside the isolation cylinder 10 and is movably arranged along the axial direction L of the isolation cylinder 10; the second heater 40 is mounted on the connecting member 22 and is arranged toward the fixing member 23; the fixing member 23 is used to fix one end of the loose body I. Specifically, the main body 21 is located outside the isolation cylinder 10 and is connected to the lifting mechanism, which pulls the main body 21 to move back and forth along the axial direction L of the isolation cylinder 10. The second heater 40 is mounted on the connecting member 22 and is arranged toward the fixing member 23 so as to be close to the tail handle end of the loose body I. The fixing member 23 is configured as a chuck having three or four claws, and the tail handle end of the loose body I is suspended on the chuck and fastened by the claws. In this way, by setting up the rod feeding device 20 including the main body 21, the connecting part 22 and the fixing part 23 connected in sequence along the axial direction L of the isolation cylinder 10, it is convenient to install and fix the loose body I and the second heater 40. The loose body I and the second heater 40 can move synchronously, and the second heater 40 can be used to heat the loose body I to compensate for the heat required for the reaction.

[0048] In some embodiments, the connecting member 22 includes a wire tube 221 and a protective tube 222 sleeved outside the wire tube 221; the second heater 40 includes a protective shell 41 and a heater body 42 arranged in the protective shell 41; the wire tube 221 and the protective tube 222 pass through the protective shell 41 together; a wire s is provided in the wire tube 221, and the wire s passes through the protective tube 222 and the wire tube 221, and the wire s electrically connects the heater body 42 and the power supply.

[0049] Specifically, the connecting member 22 is connected between the main body 21 and the fixing member 23. The connecting member 22 is provided to include a wire tube 221 and a protective tube 222 sleeved outside the wire tube 221, that is, the connecting member 22 is provided as a double-layer tube body. In this embodiment, the wire tube 221 is a metal tube for accommodating the wire s and providing force support. The protective tube 222 is made of high-purity quartz and is resistant to high temperatures. Furthermore, the second heater 40 is provided to include a protective shell 41 and a heater body 42 arranged in the protective shell 41, that is, the second heater 40 is provided as a double-layer structure. In this embodiment, the protective shell 41 is made of high-purity quartz, and the heater body 42 is made of a graphite material with good thermal conductivity and electrical resistance. The wire tube 221 and the protective tube 222 pass through the protective shell 41 together, and the protective tube 222 and the protective shell 41 can be connected and fixed by screwing, so that the second heater 40 is installed on the connecting member 22. By disposing a wire s within the wire tube 221, the wire s is a cable, extending through the wire tube 221 and the main body 21 of the rod feeding device 20. One end of the wire s is connected to the heater body 42, and the other end is connected to a low-voltage, high-current AC power source, so that the second heater 40 can be powered on and used. When powered on, the heater body 42 generates heat through graphite, which can continuously provide a high-temperature environment of over 900°C. In this embodiment, the second heater 40 and the connector 22 constructed as described above can be processed for a long time in the range of 900°C to 1500°C. In this way, by configuring the connector 22 and the second heater 40 as a double-layer structure, the wire tube 221, the wire s, and the heater body 42 can be protected from corrosion and damage by the gas in the isolation cylinder 10, and the loose body I can be prevented from being contaminated by foreign matter, and long-term high-temperature processing can be performed.

[0050] In some embodiments, the wire tube 221 is provided with an air inlet channel and an exhaust channel. The air inlet channel is used to provide cooling gas to the wire tube 221. The exhaust channel passes through the protective tube 222 and is connected to the internal space of the protective shell 41. The protective shell 41 is provided with an exhaust hole. Specifically, an air inlet channel can be opened at the top of the wire tube 221 near the main body 21 of the rod feeding device 20, and the wire tube 221 and the protective tube 222 are provided with through openings on the side walls inside the protective shell 41 of the second heater 40 to form an exhaust channel. In this embodiment, helium can be used as the cooling gas. Helium is provided to the wire tube 221 through the air inlet channel to cool the wire s in a high temperature environment and take away the heat from the wire s. The helium that has undergone heat exchange is passed into the protective shell 41 through the exhaust channel and discharged into the isolation cylinder 10 through the exhaust hole. The heat source of the heater body 42 can be quickly transferred to the isolation cylinder 10 to compensate for the reaction temperature.

[0051] In some embodiments, the first heater 30 is arranged around the isolating cylinder 10 along the circumference of the isolating cylinder 10. In this embodiment, the first heater 30 is made of graphite material with good thermal conductivity and electrical resistance, and is connected to a low-voltage, high-current AC power supply via a cable. When the first heater 30 is powered on, heat is generated by graphite, and a high temperature of more than 900°C can be continuously provided. Furthermore, the first heater 30 is an annular heater, which is arranged around the side wall of the isolating cylinder 10. In this embodiment, the first heater 30 can be fixed to the annular furnace frame 50 outside the isolating cylinder 10 by providing an insulating base. In this way, the isolating cylinder 10 can be evenly heated to form a high-temperature heating zone with evenly distributed heat, which helps to evenly heat all parts of the loose body I.

[0052] Furthermore, the rod-feeding device 20 can be rotatably arranged to rotate the loose body I along its axis. Specifically, the main body 21 of the rod-feeding device 20 can be configured as a rotatable chuck structure to achieve the rotatable arrangement of the rod-feeding device 20. In this way, the rod-feeding device 20 rotates while descending, driving the loose body I to rotate, so that all radial portions of the loose body I are evenly heated.

[0053] In some embodiments, the isolation cylinder 10 is further provided with an exhaust port 10b, and the exhaust port 10b and the air inlet 10a are located on both sides of the first heater 30 along the axial direction L of the isolation cylinder 10; in this embodiment, the air inlet 10a is used to provide reaction gas to the high-temperature heating zone, and the exhaust port 10b and the air inlet 10a are located on both sides of the first heater 30 along the axial direction L of the isolation cylinder 10. In this way, an air flow channel can be formed in the isolation cylinder 10 to improve the fluidity of the reaction gas.

[0054] See Figure 1 and Figure 2Based on the same inventive concept, the embodiment of the present application further provides a processing method of a heating system 100 for dehydration and sintering of a loose body, comprising:

[0055] S201 , starting the first heater 30 and the second heater 40 , so that the first heater 30 is heated to a first temperature and the second heater 40 is heated to a second temperature.

[0056] S202: Use the rod feeding device 20 to move the loose body I toward the high-temperature heating zone of the isolation cylinder 10, and introduce the reaction gas into the air inlet 10a.

[0057] S203 , when the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolation cylinder 10 reaches a first distance threshold, the second heater 40 is heated to a third temperature.

[0058] S204. When the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolation cylinder 10 reaches a second distance threshold, the second heater 40 is cooled to a second temperature, and the loose body I is moved back toward the high-temperature heating zone of the isolation cylinder 10 through the rod feeding device 20; wherein the second distance threshold is smaller than the first distance threshold.

[0059] It should be noted that when the distance between the second heater 40 and the first heater 30 in the axial direction L of the insulating cylinder 10 reaches a first distance threshold, the head of the loose body I extends into the high-temperature heating zone, and when the distance between the second heater 40 and the first heater 30 in the axial direction L of the insulating cylinder 10 reaches a second distance threshold, the tail of the loose body I reaches the high-temperature heating zone. In this embodiment, the distance between the second heater 40 and the first heater 30 in the axial direction L of the insulating cylinder 10 can be determined by counting the number of times the drive motor of the lifting mechanism is used, and a controller can be provided to automatically control the temperature of the second heater 40 to increase or decrease through feedback control.

[0060] In this embodiment, when the loose body I needs to be dehydrated or sintered, the loose body I is fixed on the rod feeding device 20 so that the loose body I is located at a preset initial position in the isolation cylinder 10, and the first heater 30 and the second heater 40 are turned on, so that the first heater 30 is heated to a first temperature, and the second heater 40 is heated to a second temperature. In this way, the isolation cylinder 10 is heated by the first heater 30 to form a high-temperature heating zone, and the loose body I is preheated by the second heater 40; the reaction gas is introduced into the isolation cylinder 10 through the air inlet 10a, and the loose body I is moved toward the high-temperature heating zone of the isolation cylinder 10 through the rod feeding device 20. During the movement, the loose body I is heated by the second heater 40, and the heating temperature of the second heater 40 can be adjusted according to the vertical distance between the second heater 40 and the first heater 30. Specifically, when the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolation cylinder 10 reaches a first distance threshold, the second heater 40 is heated to a third temperature. When the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolation cylinder 10 reaches a second distance threshold, the second heater 40 is cooled to the second temperature, and the loose body I is moved back to the high-temperature heating zone of the isolation cylinder 10 through the rod feeding device 20, and the loose body I is quickly restored to the preset initial position.

[0061] In some embodiments, the processing method of the present application further includes: during the dehydration process, the reaction gas includes chlorine and helium, the first temperature is 1100°C to 1200°C, the second temperature is 900°C, and the third temperature is 1200°C to 1300°C. It should be noted that during the dehydration process, the reaction gas may include chlorine and helium, and may also include oxygen. The reaction gas can enter the soot body I, use the low molecular weight helium to transfer heat, use the chlorine to replace the residual hydroxide ions in the soot body I, and use the oxygen to compensate for the silica defects, thereby reducing the signal attenuation of the optical fiber preform at a wavelength of 1383nm.

[0062] Specifically, during the dehydration process, the loose body I is fixed on the rod feeding device 20 so that the loose body I is located at a preset initial position in the isolation cylinder 10, the first heater 30 and the second heater 40 are turned on, the first heater 30 is heated to 1100°C to 1200°C, the second heater 40 is heated to 900°C, chlorine, helium and oxygen are introduced into the isolation cylinder 10 through the air inlet 10a, and the loose body I is lowered toward the high-temperature heating zone of the isolation cylinder 10 through the rod feeding device 20. When the second heater 4 When the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolation cylinder 10 reaches a specified first distance threshold, the second heater 40 is heated to 1200°C to 1300°C. When the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolation cylinder 10 reaches a second distance threshold, the second heater 40 is cooled to 900°C, and the loose body I is moved back to the high-temperature heating zone of the isolation cylinder 10 through the rod feeding device 20, and the loose body I is quickly restored to the preset initial position.

[0063] Furthermore, during the sintering process, the reaction gas includes helium, the first temperature is 1500°C to 1600°C, the second temperature is 900°C, and the third temperature is 1400°C to 1500°C.

[0064] It should be noted that during the sintering process, the reaction gas includes helium, which can enter the soot body I and transfer heat by utilizing the small molecular weight of helium, thereby shrinking the soot body I into a transparent body.

[0065] Specifically, during the sintering process, the loose body I is fixed on the rod feeding device 20 so that the loose body I is located at a preset initial position in the isolation cylinder 10, the first heater 30 and the second heater 40 are turned on, the first heater 30 is heated to 1500°C to 1600°C, the second heater 40 is heated to 900°C, helium is introduced into the isolation cylinder 10 through the air inlet 10a, and the loose body I is lowered toward the high-temperature heating zone of the isolation cylinder 10 through the rod feeding device 20. When the second heater 40 and the When the distance between the first heater 30 and the isolating cylinder 10 in the axial direction L reaches a specified first distance threshold, the second heater 40 is heated to 1400°C to 1500°C. When the distance between the second heater 40 and the first heater 30 in the axial direction L of the isolating cylinder 10 reaches a second distance threshold, the second heater 40 is cooled to 900°C, and the rod feeding device 20 is used to move the loose body I away from the high-temperature heating zone of the isolating cylinder 10, quickly returning the loose body I to the preset initial position. Finally, the first heater 30 is gradually cooled to 900°C to 1000°C, and the second heater 40 is gradually cooled to 60°C to 100°C. The tail end of the loose body I is loosened from the fixing member 23 of the rod feeding device 20, and the transparent loose body I is removed.

[0066] In this way, during the dehydration and sintering process, when the loose body I descends and approaches the high-temperature heating zone formed by the first heater 30, the heating temperature of the second heater 40 is increased, so that the reaction temperature of the part of the loose body I close to the tail handle end is continuously stable and increased by 15% to 25%, reducing the difference in reaction temperature with the head of the loose body I, improving the heating uniformity of the loose body I during the dehydration or sintering process, and making the various parts of the loose body react uniformly, so as to reduce the difference in the geometric dimensions of the loose body I in the length direction, and at the same time reduce the loss of the tail structure of the loose body I, the mode field diameter, the cutoff wavelength and other optical properties in the length direction, and shorten the processing time of the loose body I in the dehydration and sintering stages as a whole, and reduce the consumption of electricity and reaction gas, thereby realizing efficient, energy-saving and high-quality processing of the loose body I on the above-mentioned heating system 100.

[0067] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heating system for dehydration and sintering of loose bodies, characterized in that: include: an isolation cylinder having a high-temperature heating zone therein and an air inlet provided on the isolation cylinder for supplying reaction gas to the high-temperature heating zone; A rod feeding device is movably arranged along the axis direction of the isolation cylinder, and is used to move the loose body to the high-temperature heating zone in the isolation cylinder; a first heater, disposed outside the isolation cylinder, for heating the isolation cylinder to form the high-temperature heating zone; and The second heater is arranged on the rod feeding device and is disposed toward one end of the loose body, and the second heater is used to heat the loose body.

2. The heating system for dehydration and sintering of loose bodies according to claim 1, characterized in that: The dimension of the second heater along the first direction is greater than the maximum radial dimension of the loose body; The first direction is parallel to the radial direction of the loose body.

3. The heating system for dehydration and sintering of loose bodies according to claim 1, characterized in that: It also includes a lifting mechanism, the rod feeding device is connected to the lifting mechanism, and the lifting mechanism is used to pull the rod feeding device to move along the axial direction of the isolation cylinder.

4. The heating system for dehydration and sintering of loose bodies according to claim 1, characterized in that: The rod feeding device includes a main body, a connecting piece and a fixing piece which are sequentially connected along the axial direction of the isolation cylinder; The main body is located outside the isolation cylinder and is movably arranged along the axial direction of the isolation cylinder; the second heater is installed on the connecting member and is arranged toward the fixing member; the fixing member is used to fix one end of the loose body.

5. The heating system for dehydration and sintering of loose bodies according to claim 4, characterized in that: The connecting piece includes a wire tube and a protective tube sleeved outside the wire tube; the second heater includes a protective shell and a heater body arranged in the protective shell; The wire tube and the protection tube pass through the protection shell together; a wire is arranged in the wire tube, and the wire passes through the protection tube and the wire tube, and the wire is electrically connected to the heater body and the power supply.

6. The heating system for dehydration and sintering of loose bodies according to claim 5, characterized in that: The wire tube is provided with an air inlet channel and an exhaust channel. The air inlet channel is used to provide cooling gas into the wire tube. The exhaust channel passes through the protective tube and communicates with the inner space of the protective shell. The protective shell is provided with an exhaust hole.

7. The heating system for dehydration and sintering of loose bodies according to claim 5, characterized in that: The protection tube and the protection shell are both made of quartz material.

8. The heating system for dehydration and sintering of loose bodies according to any one of claims 1 to 7, characterized in that: The first heater is disposed around the isolation cylinder along the circumference of the isolation cylinder.

9. The heating system for dehydration and sintering of loose bodies according to any one of claims 1 to 7, characterized in that: The rod feeding device can be rotatably arranged to rotate the loose body along its axial direction.

10. The heating system for dehydration and sintering of loose bodies according to any one of claims 1 to 7, characterized in that: The isolation cylinder is further provided with an exhaust port, and the exhaust port and the air inlet are located on both sides of the first heater along the axial direction of the isolation cylinder.

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