CN105271697A - Sintering furnace - Google Patents
Sintering furnace Download PDFInfo
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- CN105271697A CN105271697A CN201510736724.7A CN201510736724A CN105271697A CN 105271697 A CN105271697 A CN 105271697A CN 201510736724 A CN201510736724 A CN 201510736724A CN 105271697 A CN105271697 A CN 105271697A
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- muffle tube
- insulation layer
- thermal insulation
- outer casing
- gas
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Abstract
The invention provides a sintering furnace. According to the sintering furnace, the fluctuation of the pressure of the gas in a muffle pipe can be improved effectively, loose bodies are enabled not to be polluted secondarily, the energy consumption of the sintering furnace is reduced effectively, the stability of the pressure of the gas in the muffle pipe is improved, and simultaneously, the power consumption during the operating of the sintering furnace is reduced. The sintering furnace comprises the muffle pipe, a heating body, a heat insulating layer and an outer shell, wherein the muffle pipe penetrates through the part, on which the heating body is positioned, of the outer shell; the heat insulating layer is arranged between the heating body and the outer shell; the loose bodies are arranged in the cavity, positioned in the outer shell, of the muffle pipe; the sintering furnace is characterized in that a spiral gas pipeline is arranged in the space between the heat insulating layer and the outer shell; the gas inlet of the spiral has pipeline is externally exposed at the outer shell; an outer heat insulating layer sleeves the part, exposed at the outer shell, of the muffle pipe; the gas outlet of the spiral gas pipeline is communicated with the gas inlet in one end of the muffle pipe; a waste gas exhaust opening is formed in the other end of the muffle pipe; a connecting rod is arranged in the cavity, communicated with the waste gas exhaust opening, of the muffle pipe.
Description
Technical field
The present invention relates to the technical field of preform sintering, be specially a kind of sintering oven.
Background technology
In preform manufacturing processed, generally the methods such as OVD, VAD are first adopted to produce silica dust presoma (or being called loosening body), then loosening body is positioned in sintering oven, pass into the gas such as chlorine, helium and slough moisture wherein and hydroxyl, then continue to heat up, make loosening body glass change into preform.
The structure of existing sintering oven is shown in Fig. 1, it is made up of parts such as silica glass muffle tube 1 ', heating element 2 ', thermal insulation layer 3 ', outer casing 4 ', temperature control units, when loosening body dewaters, temperature control unit controls heating element 2 ' by about heating temperatures to 1200 in muffle tube 1 ' DEG C, pass into chlorine and helium and loosening body to react, after moisture removal in loosening body 5 ' is clean, continues to be warming up to about 1500 DEG C, make loosening body 5 ' be glassed to preform.But in dehydration, due to the fluctuation of muffle tube 1 ' internal pressure, external moisture can enter in muffle tube 1 ', and together with the steam of having discharged from loosening body, recontamination has been dewatered loosening body completely, causes the loss of water of optical fiber to increase.On the other hand, along with the increase of heating 2 ' thermal value, a large amount of heats arrives outer casing 4 ' through thermal insulation layer 3 ', even outside atmosphere, causes larger energy loss, and has a certain impact to safety, in Fig. 1,6 ' be outlet port, 7 ' be connecting rod, 8 ' is inlet mouth.
Chinese invention patent 200410100698.0 " dehydration-sintering furnace " discloses a kind of prevention and discharges the method that steam pollutes the complete loosening body that dewatered again in loosening body, namely by installing water-vapor removing device on muffle tube exhaust emission tube road, and simultaneously after water-vapor removing device setting pressure change buffer deal with the pollution of steam to loosening body.The method can reduce the again pollution of steam to loosening body to a certain extent, but because installation site is far away according to loosening body, cannot work to the steam between loosening body and this device, when muffle tube internal pressure diminishes, gas between loosening body and water-vapor removing device can move to loosening body, and loosening body likely can be polluted again.Meanwhile, if muffle tube mouth is poorly sealed, when muffle tube internal pressure diminishes suddenly in a flash at certain, external moisture may enter muffle tube equally and pollute loosening body.
Therefore need a kind of technology can improving gaseous tension fluctuation in muffle tube, again pollute loosening body effectively to prevent steam.Simultaneously along with the novel life ideas such as energy-saving and emission-reduction, low-carbon (LC) life are rooted in the hearts of the people all the more, reduce preform presoma in dehydration, the energy consumption in sintering stage, to save energy, control cost, improve product competitiveness and have very important significance.
Summary of the invention
For the problems referred to above, the invention provides a kind of sintering oven, it effectively can improve the fluctuation of gaseous tension in muffle tube, guarantee that loosening body can not be secondary polluted, and it effectively reduces the energy consumption of sintering oven itself, in raising muffle tube, gaseous tension stability simultaneously, reduces sintering oven power consumption operationally.
A kind of sintering oven, its technical scheme is such: it comprises muffle tube, heating element, thermal insulation layer, outer casing, described muffle tube runs through the outer casing at heating element place, described thermal insulation layer is furnished with between described heating element and described outer casing, the cavity that described muffle tube is positioned at described outer casing is provided with loosening body, it is characterized in that: in the space between described thermal insulation layer and described outer casing, be furnished with spiral air pipeline, the air inlet of described spiral air pipeline exposes to described outer casing, the part that described muffle tube exposes to described outer casing is set with outer thermal insulation layer, the air outlet of described spiral air pipeline is communicated with the inlet mouth of described muffle tube one end, the other end of described muffle tube is provided with outlet port, connecting rod is furnished with in the cavity that described muffle tube is communicated with described outlet port.
It is further characterized in that: described outlet port is arranged in the outer ring surface of the other end of described muffle tube, and described discarded relief outlet runs through the outer thermal insulation layer of described muffle tube correspondence position;
The air outlet of described spiral air pipeline is circumscribed with connecting pipeline, and described connecting pipeline is communicated to the inlet mouth of described muffle tube one end, and described connecting pipeline is positioned at the inside of described outer thermal insulation layer;
Described spiral air pipeline is close to described thermal insulation layer and is arranged, described spiral air pipe ring is around in the outside surface of described thermal insulation layer, and the gas guaranteeing in spiral air pipeline at utmost can absorb the heat that thermal insulation layer distributes.
After adopting the present invention, spiral air pipeline is increased within thermal insulation layer, outer casing 6, gas passes into by entering spiral air pipeline after inlet mouth, while the gas flow in spiral air pipeline, absorbs and produces non-insulation layer by heating element and completely cut off revealed heat, the heat of arrival outer casing is reduced, become give up as use, gas enters in muffle tube after preheating, and in muffle tube between original hot gas the temperature difference reduce, convection current weakens, and muffle tube internal pressure stability improves, hot gas and loosening body react, and waste gas is discharged by outlet port, and be improve furnace inner gas pressure fluctuation and calorific loss further, outer thermal insulation layer is increased outside muffle tube, the heat produced by heating element so is further protected, outer thermal insulation layer also improves the temperature difference of the low gas of two ends temperature and middle part high-temperature gas in muffle tube simultaneously, further improvement muffle tube internal pressure fluctuation, it effectively can improve the fluctuation of gaseous tension in muffle tube, guarantee that loosening body can not be secondary polluted, and it effectively reduces the energy consumption of sintering oven itself, in raising muffle tube, gaseous tension stability simultaneously, reduce sintering oven power consumption operationally.
Accompanying drawing explanation
Fig. 1 is the structural representation of the sintering oven of prior art;
Fig. 2 is the structural representation of sintering oven of the present invention;
Reference name in Fig. 2 corresponding to each sequence number is as follows:
Muffle tube 1, heating element 2, thermal insulation layer 3, outer casing 4, loosening body 5, outlet port 6, connecting rod 7, inlet mouth 8, spiral air pipeline 9, air inlet 10, outer thermal insulation layer 11, connecting pipeline 12.
Embodiment
A kind of sintering oven, see Fig. 2, it comprises muffle tube 1, heating element 2, thermal insulation layer 3, outer casing 4, muffle tube 1 runs through the outer casing 4 at heating element 2 place, thermal insulation layer 3 is furnished with between heating element 2 and outer casing 4, the cavity that muffle tube 1 is positioned at outer casing 4 is provided with loosening body 5, spiral air pipeline 9 is furnished with in space between thermal insulation layer 3 and outer casing 4, the air inlet 10 of spiral air pipeline 9 exposes to outer casing 4, the part that muffle tube 1 exposes to outer casing 4 is set with outer thermal insulation layer 11, the air outlet of spiral air pipeline 9 is communicated with the inlet mouth 8 of muffle tube 1 one end, the other end of muffle tube 1 is provided with outlet port 6, connecting rod 7 is furnished with in the cavity that muffle tube 1 is communicated with outlet port 6.
Outlet port 6 is arranged in the outer ring surface of the other end of muffle tube 1, and discarded relief outlet 6 runs through the outer thermal insulation layer 11 of muffle tube 1 correspondence position;
The air outlet of spiral air pipeline 9 is circumscribed with connecting pipeline 12, and connecting pipeline 12 is communicated to the inlet mouth 8 of muffle tube 1 one end, and connecting pipeline 12 is positioned at the inside of outer thermal insulation layer 11;
Spiral air pipeline 9 is close to thermal insulation layer 3 and is arranged, the gas guaranteeing in spiral air pipeline 9 at utmost can absorb the heat that thermal insulation layer distributes.
Its principle of work is as follows:
First, spiral air pipeline 9 is increased in space between thermal insulation layer 3, outer casing 4, will from mass flow controller (MFC) effluent air access spiral air pipeline 9, gas is preheated while flowing through in spiral element spiral air pipeline 9 road, passes in muffle tube 1 subsequently; The temperature difference in the gas and muffle tube 1 of preheating between hot gas diminishes, and between gas, convection current dies down, and in muffle tube 1, gaseous tension fluctuation improves.Simultaneously because the heat through thermal insulation layer 3 is by the gas absorption flow through, the surface temperature of outer casing 4 reduces, and security improves, and outer casing 4 generates heat and also to reduce the impact of envrionment temperature, and envrionment temperature controls energy consumption and decreases.
In addition, due to sintering oven limited height, and muffle tube 1 length is longer, and the gas temperature being in sintering oven high-temperature area will certainly be caused to be significantly higher than the gas temperature at muffle tube 1 two ends, the fluctuation to gaseous tension in the aggravation muffle tube 1 that fails to be convened for lack of a quorum between high/low temperature gas.Therefore, the present invention carries out isothermal holding to muffle tube non high temperature part by outer thermal insulation layer 11, to reduce in pipe hot gas and External cooling gas by the cold and hot exchange of tube wall, thus slackens the convection current of the interior cold and hot gas of pipe.
Above two aspects, gaseous tension stability simultaneously, can reduce sintering oven power consumption operationally in raising muffle tube 1.
Above specific embodiments of the invention have been described in detail, but content being only the preferred embodiment of the invention, the practical range for limiting the invention can not being considered to.All equalizations done according to the invention application range change and improve, and all should still belong within patent covering scope of the present invention.
Claims (4)
1. a sintering oven, it comprises muffle tube, heating element, thermal insulation layer, outer casing, described muffle tube runs through the outer casing at heating element place, described thermal insulation layer is furnished with between described heating element and described outer casing, the cavity that described muffle tube is positioned at described outer casing is provided with loosening body, it is characterized in that: in the space between described thermal insulation layer and described outer casing, be furnished with spiral air pipeline, the air inlet of described spiral air pipeline exposes to described outer casing, the part that described muffle tube exposes to described outer casing is set with outer thermal insulation layer, the air outlet of described spiral air pipeline is communicated with the inlet mouth of described muffle tube one end, the other end of described muffle tube is provided with outlet port, connecting rod is furnished with in the cavity that described muffle tube is communicated with described outlet port.
2. a kind of sintering oven as claimed in claim 1, is characterized in that: described outlet port is arranged in the outer ring surface of the other end of described muffle tube, described discarded relief outlet runs through the outer thermal insulation layer of described muffle tube correspondence position.
3. a kind of sintering oven as claimed in claim 1, it is characterized in that: the air outlet of described spiral air pipeline is circumscribed with connecting pipeline, described connecting pipeline is communicated to the inlet mouth of described muffle tube one end, and described connecting pipeline is positioned at the inside of described outer thermal insulation layer.
4. as claim 1 sintering oven, it is characterized in that: described spiral air pipeline is close to described thermal insulation layer and is arranged, described spiral air pipe ring is around in the outside surface of described thermal insulation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736724.7A CN105271697A (en) | 2015-11-03 | 2015-11-03 | Sintering furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510736724.7A CN105271697A (en) | 2015-11-03 | 2015-11-03 | Sintering furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105271697A true CN105271697A (en) | 2016-01-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510736724.7A Pending CN105271697A (en) | 2015-11-03 | 2015-11-03 | Sintering furnace |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108178501A (en) * | 2018-02-05 | 2018-06-19 | 烽火通信科技股份有限公司 | For the muffle tube and its application method of the sintering of prefabricated rods loosening body |
| CN109012494A (en) * | 2018-09-18 | 2018-12-18 | 湖南顶立科技有限公司 | A kind of safe air intake structure of high-temperature high-pressure apparatus and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176329A (en) * | 1987-01-14 | 1988-07-20 | Hitachi Cable Ltd | Drawing device for optical fiber |
| CN1626468A (en) * | 2003-12-08 | 2005-06-15 | 株式会社藤仓 | Dewatering fritting furnace, method of mfg. optical fiber precast by using such furnace and optical fiber precast by same method |
| CN1740108A (en) * | 2004-08-23 | 2006-03-01 | 古河电气工业株式会社 | Method for producing optical fiber substrate |
| WO2015105008A1 (en) * | 2014-01-07 | 2015-07-16 | 古河電気工業株式会社 | Method for producing optical fiber preform and method for producing optical fiber |
-
2015
- 2015-11-03 CN CN201510736724.7A patent/CN105271697A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63176329A (en) * | 1987-01-14 | 1988-07-20 | Hitachi Cable Ltd | Drawing device for optical fiber |
| CN1626468A (en) * | 2003-12-08 | 2005-06-15 | 株式会社藤仓 | Dewatering fritting furnace, method of mfg. optical fiber precast by using such furnace and optical fiber precast by same method |
| CN1740108A (en) * | 2004-08-23 | 2006-03-01 | 古河电气工业株式会社 | Method for producing optical fiber substrate |
| WO2015105008A1 (en) * | 2014-01-07 | 2015-07-16 | 古河電気工業株式会社 | Method for producing optical fiber preform and method for producing optical fiber |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108178501A (en) * | 2018-02-05 | 2018-06-19 | 烽火通信科技股份有限公司 | For the muffle tube and its application method of the sintering of prefabricated rods loosening body |
| CN108178501B (en) * | 2018-02-05 | 2024-02-27 | 武汉烽火锐拓科技有限公司 | Muffle tube for sintering loose body of preform and use method thereof |
| CN109012494A (en) * | 2018-09-18 | 2018-12-18 | 湖南顶立科技有限公司 | A kind of safe air intake structure of high-temperature high-pressure apparatus and method |
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Application publication date: 20160127 |