CN1576764A - Heat processing furnace - Google Patents
Heat processing furnace Download PDFInfo
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- CN1576764A CN1576764A CN 200310100617 CN200310100617A CN1576764A CN 1576764 A CN1576764 A CN 1576764A CN 200310100617 CN200310100617 CN 200310100617 CN 200310100617 A CN200310100617 A CN 200310100617A CN 1576764 A CN1576764 A CN 1576764A
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Abstract
Provided is a heat treatment furnace capable of shortening a time necessary for replacing an initial furnace atmosphere with a desired furnace atmosphere, precisely performing the replacement, and lowering a concentration of residual initial furnace atmospheric gas in comparison with a conventional one, for example, when the furnace atmosphere is replaced with a nitrogen gas. In this heat treatment furnace, a refractory 2 having air permeability, is mounted along a wall face of a furnace wall 1 at the inside of the furnace wall 1. A clearance 3 is formed between the furnace wall 1 and the refractory 2, and a gas for adjusting the atmosphere, of a specific composition introduced into the clearance 3 is sent into the furnace through the inside of the refractor 2, in adjusting the furnace atmosphere.
Description
Technical field
The present invention relates to as the production stove of electronic units such as ferrite the heat-treatment furnace that need adjust furnace atmosphere.
Background technology
In the occasion of electronic units such as ferrite being carried out sintering in heat-treatment furnace, furnace atmosphere need be adjusted to a certain set oxygen concentration.Usually, the atmosphere of this oxygen concentration can be by introducing the gas that is mixed by both certainty ratios by nitrogen and air in stove, and introduces preceding initial furnace atmosphere gas (being generally air) and replace and form.
Fig. 5 is the skeleton diagram that need carry out an example of the employed existing heat-treatment furnace of heat treatment that above-mentioned atmosphere adjusts.In this heat-treatment furnace, inboard in the furnace wall 11 that constitutes by steel plate, dispose with 11 wall and furnace wall 11 contacted state configuration along the furnace wall, ceramic fibre etc. is flocculence and refractory material 12 with aeration, in addition, be provided with and outside stove, pass the gas that furnace wall 11 and refractory material 12 lead to the tubulose in the stove and introduce with nozzle 16.
And, when adjusting furnace atmosphere, what adopt is a kind of like this method, promptly, after utilizing chassis 8 to send in the stove as the goods 9 of heat treatment object, when furnace gas being discharged, will have the set atmosphere adjustment of forming by the gas introducing with nozzle 16 and directly introduce in the stove, initial furnace gas will be replaced (the formerly technology relevant with the prior art do not seen as yet) with the atmosphere adjustment of being introduced with gas with gas (for example nitrogen) from exhaust outlet 17.
Summary of the invention
But, as aforementioned existing heat-treatment furnace, be present in the initial furnace atmosphere gas in the space of flocculence refractory material 12 inside, be difficult to by atmosphere that introduced adjustment gas displacement, and, residue in the initial furnace atmosphere gas of these refractory material 12 inside, after the atmosphere adjustment begins with the introducing of gas, to in for a long time, in stove, spread lentamente, therefore, the displacement of furnace atmosphere needs for a long time, and the reduction of the remaining concentration of initial furnace atmosphere gas is also limited.
For example, in stove, introduce nitrogen, with furnace atmosphere from initial air condition (oxygen concentration 20.6%), reduce oxygen concentration and make remaining oxygen concentration reach 1000ppm, need about 90 minutes time swap, and it has been lower limit that remaining oxygen concentration is reduced to about 300ppm.
The present invention be directed to that above-mentioned present situation puts forward, its objective is, a kind of heat-treatment furnace is provided, when adjusting furnace atmosphere, can shorten that initial furnace atmosphere is replaced into the needed time of desirable furnace atmosphere, and can more critically replace, and, for example furnace atmosphere is being replaced into the such occasion of nitrogen, the remaining concentration of initial furnace atmosphere gas is lower than in the past.
Realize the means of invention task
According to the present invention, a kind of heat-treatment furnace that disposes the refractory material with aeration in the inboard of furnace wall along the wall of this furnace wall can be provided, it is characterized in that, between described furnace wall and described refractory material, be provided with the gap, when adjusting furnace atmosphere, can make the atmosphere adjustment gas that is introduced in the described gap with set composition, from the inside of described refractory material by after enter in the stove.
Description of drawings
Fig. 1 is a skeleton diagram that example is showed to the form of implementation of heat-treatment furnace involved in the present invention.
Fig. 2 is the skeleton diagram that another example of the form of implementation of heat-treatment furnace involved in the present invention is showed.
Fig. 3 is a curve map of showing the result of embodiment.
Fig. 4 is a curve map of showing the result of embodiment.
Fig. 5 is a skeleton diagram that example is showed that needs is carried out the employed existing heat-treatment furnace of heat treatment of atmosphere adjustment.
Concrete form of implementation
Fig. 1 is a skeleton diagram that example is showed to the form of implementation of heat-treatment furnace involved in the present invention.Heat-treatment furnace of the present invention, though be inboard in the furnace wall 1 that steel plate constitutes, the ceramic fibre etc. that disposes along the furnace wall 1 wall configuration has the heat-treatment furnace of the refractory material (heat-insulating material) 2 of aeration, but not that refractory material and furnace wall dispose in contact as aforementioned existing heat-treatment furnace, but 1 separate set arranged spaced apart from the furnace wall, between furnace wall 1 and refractory material 2, form gap 3.
And, when adjusting furnace atmosphere, after utilizing chassis 8 to send in the stove as the goods 9 of heat treatment object, in the time of gas in the exhaust outlet 7 discharging stoves, the atmosphere adjustment that will have a set composition is introduced in the gap 3 between furnace wall 1 and the refractory material 2 with gas (for example nitrogen).Be introduced into the atmosphere adjustment gas in this gap 3, from the inside of byssaceous refractory materials 2 such as ceramic fibre, promptly constitute the space between the fiber etc. of refractory material 2 by after enter the inside of placement goods 9.
As the present invention, by make as mentioned above the atmosphere adjustment with gas from refractory material 2 inside by after enter in the stove, the atmosphere adjustment is present in the initial furnace atmosphere gas (for example air) in the space of refractory material 2 inside before being introduced into gas, from described space, drive out of with gas with the atmosphere adjustment of being introduced, be replaced as atmosphere adjustment gas very soon.
Therefore, if adopt heat-treatment furnace of the present invention, when adjusting furnace atmosphere, can shorten significantly that initial furnace atmosphere is replaced into the needed time of desirable furnace atmosphere.For example, the oxygen concentration that obtains is the gas of 1000ppm introducing with gas that nitrogen and air mix by both certainty ratios as the atmosphere adjustment, furnace atmosphere is replaced into the occasion of this gas from air (oxygen concentration 20.6%), in the atmosphere remaining oxygen concentration reach the needed time of 1000ppm, when adopting existing heat-treatment furnace about 1/2～1/4.
In addition, because as previously mentioned, be present in the initial furnace atmosphere in the space of refractory material 2 inside, can be driven out of from described space with gas by the adjustment of atmosphere that introduced, therefore, can residue in hardly in the space, its result can make the remaining concentration of initial furnace atmosphere gas be lower than existing heat-treatment furnace.For example, with nitrogen as atmosphere adjustment introduce with gas, with furnace atmosphere is the occasion of nitrogen from air displacement, as existing heat-treatment furnace (can as produce stove actual user), it has been lower limit that oxygen concentration remaining in the atmosphere is reduced to about 300ppm, and if adopt heat-treatment furnace of the present invention, even can be reduced to below the 50ppm.
Moreover, as the present invention,, can make furnace wall 1 obtain the cooling of atmosphere adjustment with gas by between furnace wall 1 and refractory material 2, introducing atmosphere adjustment gas, the wall surface temperature of furnace wall 1 is lower than in the past, the thermal efficiency and the operational security of stove are improved.Specifically, the surface temperature of the furnace wall 1 of existing heat-treatment furnace is about 120～180 ℃, adopts heat-treatment furnace of the present invention then can be reduced to about 80～150 ℃.
In addition, refractory material 2 is not contacted with furnace wall 1 in order to be different from existing heat-treatment furnace, apart from furnace wall 1 separate set arranged spaced refractory material 2 make its with furnace wall 1 between form gap 3, the needs employing is supported refractory material 2 someway.For this reason, in the example of Fig. 1, be 1 inboard in the furnace wall, the inwall that will constitute by perforated panel 5 with a plurality of holes 4,1 separates set arranged spaced apart from the furnace wall, with this inwall refractory material 2 is supported.
But the method as refractory material 2 is supported is not limited to this, as long as gas 3 can not blocked to moving of refractory material 2 from the gap, adopts which kind of holding components all can.For example, perforated panel 5 that also can alternate figures 1 is installed copper coin etc. can the spacing that refractory material 2 is supported being vacated the gap.
In addition, in heat-treatment furnace of the present invention, also can be as shown in Figure 2, furnace wall 1 and refractory material 2 are passed in setting outside stove and the gas that feeds in the stove is introduced with nozzle 6, when adjusting furnace atmosphere, and when introducing the atmosphere adjustment with gas in the gap 3 between furnace wall 1 and refractory material 2,, with nozzle 6 the atmosphere adjustment is introduced in stove with gas from the gas introducing also as existing heat-treatment furnace.Since as mentioned above can two kinds introducing method and usefulness, thereby can further shorten the time swap of furnace atmosphere.
Having, in the present invention, is not to introduce atmosphere adjustment gas from all faces of stove again, for example, can just be provided with between furnace wall and a part of refractory material yet and be used for introducing the gap of atmosphere adjustment with gas, and remaining refractory material contacts with the furnace wall.In addition, the chassis for goods being sent in the stove also can be provided with same interstitial structure.
Embodiment
Below, the present invention is further detailed explanation in conjunction with the embodiments, but the present invention is not limited to these embodiment.
Use existing heat-treatment furnace shown in Figure 5 and heat-treatment furnace of the present invention shown in Figure 1, to be nitrogen mix the oxygen concentration that obtains with air by both certainty ratios is the mist of 1000ppm from air displacement with the atmosphere in the stove.For existing heat-treatment furnace, directly in stove, introduce above-mentioned mist from the gas introducing with nozzle 16, and for heat-treatment furnace of the present invention, introduce above-mentioned mist in the gap 3 between furnace wall 1 and refractory material 2, make this mist from refractory material 2 inside by after enter in the stove.As mentioned above furnace atmosphere is replaced into above-mentioned mist from air (oxygen concentration 20.6%), be reduced to the controllability of setting needed time of oxygen concentration 1000ppm (0.1%) and atmosphere with the remaining oxygen concentration of understanding in the atmosphere, the result plotted the curve of Fig. 3.In addition, introduce nitrogen in two kinds of heat-treatment furnaces, understanding is being the occasion of nitrogen with furnace atmosphere from air displacement, and the lower limit that remaining oxygen concentration reduces in the furnace atmosphere plots the result curve of Fig. 4.
As shown in Figure 3, heat-treatment furnace of the present invention can be with the time below 1/3 of existing heat-treatment furnace, and the remaining oxygen concentration that furnace atmosphere is become as target is the atmosphere of 1000ppm, and the control of atmosphere also can very critically be carried out.In addition, as shown in Figure 4, as existing heat-treatment furnace (can as produce stove actual user), it has been lower limit that remaining oxygen concentration is reduced to about 300ppm, and heat-treatment furnace of the present invention, its remaining oxygen concentration is reduced to 50ppm in the short time, finally can be reduced to 5ppm.
The effect of invention
As previously discussed bright, if adopt heat-treatment furnace of the present invention, when adjusting furnace atmosphere, energy The enough shortening significantly is replaced into the needed time of desirable furnace atmosphere with initial furnace atmosphere, Can further improve the controllability of atmosphere. In addition, can also make the rear initial furnace atmosphere of displacement The remaining concentration of gas is lower than existing heat-treatment furnace. And, the surface temperature of furnace wall is lower than in the past, The thermal efficiency and the operational security of stove are improved.
Claims (3)
1. a heat-treatment furnace that disposes the refractory material with aeration in the inboard of furnace wall along the wall of this furnace wall is characterized in that,
Between described furnace wall and described refractory material, be provided with the gap, when adjusting furnace atmosphere, can make the atmosphere adjustment gas that is introduced in the described gap with set composition, from the inside of described refractory material by after enter in the stove.
2. heat-treatment furnace as claimed in claim 1 is characterized in that, the inboard in described furnace wall, and the inwall that will be made of the perforated panel with a plurality of holes separates set arranged spaced apart from described furnace wall, with this inwall described refractory material is supported.
3. heat-treatment furnace as claimed in claim 1 or 2, it is characterized in that, be provided with the gas introducing nozzle that outside stove, passes in described furnace wall and the described refractory material feeding stove, when adjusting furnace atmosphere, can also introduce with nozzle from this gas the atmosphere adjustment is introduced in the stove with gas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP203652/2003 | 2003-07-30 | ||
| JP2003203652A JP2005048984A (en) | 2003-07-30 | 2003-07-30 | Heat treatment furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1576764A true CN1576764A (en) | 2005-02-09 |
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ID=34262930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310100617 Pending CN1576764A (en) | 2003-07-30 | 2003-10-10 | Heat processing furnace |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005048984A (en) |
| CN (1) | CN1576764A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6007870B2 (en) * | 2013-08-06 | 2016-10-12 | Ｊｆｅスチール株式会社 | Atmospheric heat treatment furnace |
| WO2017163624A1 (en) | 2016-03-24 | 2017-09-28 | 日本碍子株式会社 | Industrial furnace and method of utilizing heat therefrom |
-
2003
- 2003-07-30 JP JP2003203652A patent/JP2005048984A/en active Pending
- 2003-10-10 CN CN 200310100617 patent/CN1576764A/en active Pending
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| Publication number | Publication date |
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| JP2005048984A (en) | 2005-02-24 |
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