CN218989100U - Sintering device for loose bodies - Google Patents
Sintering device for loose bodies Download PDFInfo
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- CN218989100U CN218989100U CN202223462486.XU CN202223462486U CN218989100U CN 218989100 U CN218989100 U CN 218989100U CN 202223462486 U CN202223462486 U CN 202223462486U CN 218989100 U CN218989100 U CN 218989100U
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Abstract
The utility model discloses a sintering device of a loose body, which relates to the technical field of optical fiber manufacturing, and comprises a heating furnace isolation tube, wherein a cavity is arranged in the heating furnace isolation tube; the temperature adjusting unit is adhered to the heating furnace isolation pipe and is used for adjusting the temperature of the cavity of the heating furnace isolation pipe; the air pressure adjusting unit is arranged on the heating furnace isolation tube and is used for driving the pressure environment of the cavity to circularly convert between positive pressure and negative pressure. The sintering device provided by the utility model provides a closed cavity, and the pressure regulating device is used for circularly converting positive pressure and negative pressure to the environment of the cavity. Further, the present application allows for a loose body sintering process by adjustment of the air pressure environment, increasing the rate of chlorine gas ingress into the loose body and the effective reaction ratio with hydroxyl groups during dehydration by positive pressure. And then the negative pressure is used for improving the speed of discharging the hydroxyl from the inside of the loose body and then discharging the hydroxyl out of the furnace. Thereby improving the overall speed of the sintering process of the loose body.
Description
Technical Field
The utility model relates to the technical field of optical fiber manufacturing, in particular to a sintering device of a loose body.
Background
In recent years, with the promotion of a series of infrastructure construction such as 5G construction, FTTx, broadband China and the like, as an important carrier for optical communication, optical fibers are also valued by various levels of governments and enterprises, and for expanding the industry chain of enterprises, a plurality of optical cable production enterprises gradually expand upstream optical fibers and prefabricated bars.
In the VAD manufacturing process of the optical fiber preform, firstly, opaque powder rods are deposited in a deposition chamber, and then the opaque powder rods are sintered into the transparent optical fiber preform by a high-temperature heating furnace. Wherein the sintering stage is subdivided into two stages of dehydration and vitrification, and the dehydration is to discharge water molecules, OH ions and the like generated in the deposition process from the inside or the surface of the loose body in a high-temperature environment; vitrification is the densification of loose bodies into transparent bodies in a higher temperature environment to repair tiny appearance defects; while continuing to exhaust the internal residual gas. The optical fiber preform after sintering is drawn at high speed, so that the quality of the drawn optical fiber, particularly the optical characteristics such as attenuation and the like, can be ensured, and the strength of the drawn optical fiber can be ensured. However, the practitioner finds that the porous body spends a long time in the dehydration process, and the requirements on temperature distribution, density of the porous body and gas flow rate in the whole sintering process are very strict, and the overlong process is extremely easy to cause poor consistency of optical characteristics such as attenuation at different positions of the porous body and change of the outer diameter of the optical fiber preform, so how to quickly and efficiently complete sintering of the porous body becomes a problem to be solved urgently by the skilled artisan.
Disclosure of Invention
To the problem of loose body sintering process is too slow among the prior art, this application provides a sintering device of loose body, and it includes:
the heating furnace isolation tube is internally provided with a cavity for accommodating the loose body, and two ends of the cavity are provided with an air inlet tube and an air outlet tube;
the temperature adjusting unit is attached to the heating furnace isolation pipe and is used for adjusting the temperature of the cavity of the heating furnace isolation pipe;
the air pressure adjusting unit is arranged on the heating furnace isolation pipe in a group mode and is used for driving the pressure environment of the cavity to be circularly converted between positive pressure and negative pressure.
In some embodiments, the air pressure adjustment unit includes:
an air pump arranged on the exhaust pipe;
and the air inlet valve is arranged on the air inlet pipe.
In some embodiments, a pressure detecting part is arranged on the heating furnace isolation pipe and is used for detecting the air pressure of the cavity.
In some embodiments, the heating furnace isolation tube is further provided with an air supplementing device, and the air supplementing device is communicated with the cavity and is used for inputting helium into the cavity.
In some embodiments, the exhaust pipe is provided with a purifying device, and the purifying device is used for receiving the exhaust gas exhausted by the exhaust pipe of the cavity and purifying the exhaust gas to recover helium.
In some embodiments, the purge device is in communication with the inlet conduit and delivers helium gas into the cavity through the inlet conduit.
In some embodiments, a mobile hanger is provided in the cavity for suspending the loose body, the mobile hanger being adapted to move up and down in a vertical direction and/or to act in rotation about its axis.
In some embodiments, the pump comprises a vacuum pump.
In some embodiments, a mobile hanger is provided in the cavity for suspending the loose body, the mobile hanger being adapted to move up and down in a vertical direction and/or to act in rotation about its axis.
In some embodiments, the temperature regulating unit comprises: the heating wires are attached to the heating furnace isolation tube; and each heater is connected with one heating wire.
In some embodiments, the temperature regulating unit comprises: the two heating wires and the two heaters are symmetrically arranged on two sides of the heating furnace isolation tube.
Compared with the prior art, the sintering device provided by the utility model provides a closed cavity, and the pressure regulating device is used for circularly converting positive pressure and negative pressure to the environment of the cavity. Further, the present application allows for a loose body sintering process by adjustment of the air pressure environment, increasing the rate of chlorine gas ingress into the loose body and the effective reaction ratio with hydroxyl groups during dehydration by positive pressure. And then the negative pressure is used for improving the speed of discharging the hydroxyl from the inside of the loose body and then discharging the hydroxyl out of the furnace. Thereby improving the overall speed of the sintering process of the loose body.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a sintering apparatus for loose bodies in an embodiment of the present utility model.
In the figure: 1. a heating furnace isolation tube; 11. a cavity; 12. an air inlet pipe; 13. an exhaust pipe; 2. a temperature adjusting unit; 3. loosening the body; 4. an air pressure adjusting unit; 41. an air extracting pump; 42. an intake valve; 5. an air supplementing device; 6. a pressure detection unit; 7. and a purifying device.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Embodiments of the present utility model are described in further detail below with reference to the accompanying drawings. To the problem of loose body sintering process is too slow among the prior art, this application provides a sintering device of loose body, and it includes: a heating furnace isolation tube 1, a temperature adjusting unit 2 and an air pressure adjusting unit 4; wherein, the liquid crystal display device comprises a liquid crystal display device,
a cavity 11 is formed in the heating furnace isolation tube 1, the cavity 11 is used for accommodating the loose bodies 3, and an air inlet tube 12 and an air outlet tube 13 are arranged at two ends of the cavity 11; the temperature adjusting unit 2 is attached to the heating furnace isolation tube 1, and the temperature adjusting unit 2 is used for adjusting the temperature of the cavity 11 of the heating furnace isolation tube 1; the air pressure adjusting unit 4 is arranged on the heating furnace isolation tube 1 in a group, and the air pressure adjusting unit 4 is used for adjusting the pressure of the cavity 11.
It should be noted that the dehydration of the bulk 3 in the conventional sintering process is greatly affected by the flow rate of the reaction gas, the dehydration reference temperature, and the dehydration movement speed. The inventors have found in work that the speed of the porous body 3 to absorb and react with chlorine and the hydroxyl groups after reaction to be discharged from the interior of the porous body is very slow, which greatly slows down the speed of the whole process. Therefore, the positive and negative pressure environment can be flexibly adjusted through the air pressure adjusting unit 4 in the loose body sintering device, so that when chloride ions firstly enter the loose body 3, the entering speed of the chlorine gas and the effective reaction ratio of the chlorine gas and hydroxyl groups are improved through positive pressure. In the second stage, the hydroxyl groups are discharged from the inside of the porous body 3 and discharged outside of the furnace, and the discharge speed is increased by negative pressure. The whole dehydration process can be switched repeatedly at the 2 stages. Thereby improving the efficiency of dehydration.
Specifically, as shown in fig. 1, the air pressure adjusting unit 4 includes: a suction pump 41 and an intake valve 42; a suction pump 41 provided in the exhaust pipe 13; an intake valve 42 is provided in the intake pipe 12. Both act to rapidly adjust the air pressure environment of the cavity 11. The pump 41 may be a vacuum pump, so as to achieve flow control more simply and quickly.
In order to more precisely adjust the air pressure environment in the cavity 11 in real time, the heating furnace isolation tube 1 is provided with a pressure detection part 6, and the pressure detection part 6 is used for detecting the air pressure of the cavity 11. The pressure detecting section 6 includes a pressure gauge provided in the cavity 11 and a pressure gauge provided outside the road and connected to the pressure gauge.
It can be understood that the heating furnace isolation tube 1 is further provided with a gas supplementing device 5, and the gas supplementing device 5 is communicated with the cavity 11 and is used for inputting chlorine and helium into the cavity 11 so as to ensure that the reaction is sufficient.
In order to save the amount of helium, as shown in fig. 1, a purifying device 7 is disposed on the exhaust pipe 13, and the purifying device 7 is configured to receive the exhaust gas exhausted from the exhaust pipe 13 of the cavity 11 and purify the exhaust gas to recover helium.
Further, the purifying device 7 is communicated with the air inlet pipe 12, and helium is directly conveyed into the cavity 11 through the air inlet pipe 12.
In some preferred embodiments, in order to better adjust the dewatering movement speed of the porous body 3, a mobile hanger is provided in the cavity 11 in the present application for suspending the porous body 3, said mobile hanger being adapted to move up and down in a vertical direction and/or to act in rotation about its axis. Axial movement and rotation of the loosening body 3 can be achieved by moving the hanger, thereby achieving miniaturization of the device to save space.
Further, as shown in fig. 1, the temperature adjusting unit 2 includes: the two heating wires and the two heaters are symmetrically arranged on two sides of the heat furnace isolation tube 1.
Of course, a plurality of heating wires and a corresponding number of heaters can be arranged according to actual heating requirements.
In another aspect, the present application also provides a loose body sintering method using the above sintering device, which includes the steps of:
s1, conveying the loose bodies 3 into a cavity 11 of a heating furnace isolation tube 1;
specifically, the furnace isolation tube 1 is preferably kept at a heating temperature, and then the porous body 3 is mounted on a moving hanger by which the porous body 3 is moved into the cavity 11.
S2, dehydration: the temperature in the cavity 11 is maintained at a first preset interval by using the temperature adjusting unit 2, and the air pressure of the cavity 11 is adjusted by the air pressure adjusting unit 4, so that the air pressure environment of the cavity 11 is circularly converted between positive pressure and negative pressure, and the loose body 3 meets the dehydration standard state.
Preferably, step S2 includes: the cavity 11 is heated by the temperature regulating unit 2, when the temperature reaches 1100-1200 ℃, the movable hanging frame starts to rotate slowly, the air inlet pipe 12 and the air supplementing device 5 start to be filled with gases such as helium, chlorine and the like, the air sucking pump 41 on the air outlet pipe 13 is opened by 10 percent, and the positive pressure in the heating furnace is maintained to be 0.5+/-0.1 kPa. After a certain period of time, the vacuum pump of the suction pump 41 is started to have a 100% opening, and the negative pressure in the heating furnace is maintained at-0.2.+ -. 0.1kPa. After the exhausted gas passes through the purification device 7, most helium enters the heating furnace isolation tube 1 through the air inlet tube 12, and the rest chlorine, moisture and the like are sent to the waste gas treatment system for subsequent treatment. The above process is always circulated, and the loose body 3 meets the dehydration standard state.
It will be appreciated that the number of cycles of positive and negative pressure will need to be determined based on factors such as different temperatures, gas flow rates, bulk density, rate of movement, etc. Preferably, the dehydration process is switched back every 10-15 minutes during mass production.
S3, vitrification stage: the temperature in the cavity 11 is maintained at a second preset interval by using the temperature adjusting unit 2, and the air pressure of the cavity 11 is adjusted by the air pressure adjusting unit 4, so that the air pressure environment of the cavity 11 is maintained in a positive pressure environment until the loose body 3 meets the vitrification standard state.
Preferably, the vitrification process is started by heating the inside of the cavity 11 to 1400 to 1500 ℃. The mobile hanger starts to move downward while rotating slowly. The intake pipe 12 starts to be supplied with a gas such as helium. The vacuum pump of the exhaust pipe 13 is opened by 50 percent, and the positive pressure in the heating furnace is maintained to be 0.2+/-0.1 kPa. And the supplementary air inlet control valve is closed, and all the discharged gas is sent to the exhaust gas treatment system for subsequent treatment.
S4, moving the loose bodies 3 out of the heating furnace isolation tube 1 through a movable hanging frame.
It is worth to say that the influence of temperature in the sintering process is embodied in that the high temperature can promote the flowing speed of chlorine, hydroxyl and the like in and out of the loose body, and the reaction efficiency of the chlorine, the hydroxyl and the like is improved. However, if the temperature is too high, the porous body tends to shrink, and chlorine gas or the like having a higher density cannot enter or exit the porous body 3. I.e. the whole sintering process, including both vitrification and dehydration, requires very stringent control of temperature.
Therefore, in a specific embodiment provided herein, the temperature value of the first preset interval is between 1100 and 1200 ℃ (the fluctuation range is about ±10°), and the temperature value of the second preset interval is between 1400 and 1500 ℃.
In summary, the sintering device of the present utility model provides a closed cavity, and the pressure regulating device is used to circularly convert the positive pressure and the negative pressure of the cavity. Further, the present application allows for a loose body sintering process by adjustment of the air pressure environment, increasing the rate of chlorine gas ingress into the loose body and the effective reaction ratio with hydroxyl groups during dehydration by positive pressure. And then the negative pressure is used for improving the speed of discharging the hydroxyl from the inside of the loose body and then discharging the hydroxyl out of the furnace. Thereby improving the overall speed of the sintering process of the loose body.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A device for sintering a porous body, comprising:
the heating furnace isolation tube (1) is internally provided with a cavity (11), the cavity (11) is used for accommodating the loosening body (3), and two ends of the cavity (11) are provided with an air inlet tube (12) and an air outlet tube (13);
a temperature adjusting unit (2) attached to the heating furnace isolation tube (1), wherein the temperature adjusting unit (2) is used for adjusting the temperature of the cavity (11) of the heating furnace isolation tube (1);
the air pressure adjusting unit (4) is arranged on the heating furnace isolation tube (1) in a group mode, and the air pressure adjusting unit (4) is used for driving the pressure environment of the cavity (11) to circularly convert between positive pressure and negative pressure.
2. Sintering device according to claim 1, wherein the air pressure adjustment unit (4) comprises:
an air pump (41) provided on the exhaust pipe (13);
an intake valve (42) provided in the intake pipe (12).
3. Sintering device according to claim 2, wherein the furnace isolation tube (1) is provided with a pressure detection part (6), the pressure detection part (6) being adapted to detect the air pressure of the cavity (11).
4. Sintering device according to claim 2, characterized in that the furnace isolation tube (1) is further provided with a gas supplementing device (5), the gas supplementing device (5) being in communication with the cavity (11) and being adapted to feed helium into the cavity (11).
5. Sintering device according to claim 4, wherein said exhaust pipe (13) is provided with purification means (7), said purification means (7) being adapted to receive the exhaust gases exiting said exhaust pipe (13) of said cavity (11) and to purify said exhaust gases to recover helium.
6. Sintering plant according to claim 5, wherein said purification device (7) communicates with said inlet duct (12) and delivers helium into said cavity (11) through said inlet duct (12).
7. Sintering device according to claim 2, wherein the suction pump (41) comprises a vacuum pump.
8. Sintering device according to claim 1, wherein a mobile hanger is provided in the cavity (11) for suspending the loose body (3) for moving up and down in a vertical direction and/or for rotating about its axial direction.
9. Sintering device according to claim 1, wherein the temperature regulating unit (2) comprises:
the heating wires are attached to the heating furnace isolation tube (1);
and each heater is connected with one heating wire.
10. Sintering device according to claim 9, wherein the temperature regulating unit (2) comprises: the two heating wires and the two heaters are symmetrically arranged on two sides of the heating furnace isolation tube (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223462486.XU CN218989100U (en) | 2022-12-24 | 2022-12-24 | Sintering device for loose bodies |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223462486.XU CN218989100U (en) | 2022-12-24 | 2022-12-24 | Sintering device for loose bodies |
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| CN218989100U true CN218989100U (en) | 2023-05-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115974400A (en) * | 2022-12-24 | 2023-04-18 | 藤仓烽火光电材料科技有限公司 | Loose body sintering device and loose body sintering method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115974400A (en) * | 2022-12-24 | 2023-04-18 | 藤仓烽火光电材料科技有限公司 | Loose body sintering device and loose body sintering method |
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