【考案の詳細な説明】[Detailed explanation of the idea]
本考案は水素、窒素、酸素または空気等の雰囲
気ガスを必要とする、連続または非連続形のガス
雰囲気炉に関する。
従来よりガス雰囲気炉の雰囲気ガスは、炉体外
部に装備した、ガスボンベ、またはガス発生装置
等から、炉体の出口開口部、または炉体の側壁内
に挿着した導入管まで配管し、雰囲気ガスを該導
入管端の側壁孔から炉内に放出し、炉入口に向つ
て流動させて、炉室内の雰囲気を保持する方法が
採用されている。
しかし前述の炉室内に供給された雰囲気ガス
は、加熱され膨張して比重が下り、炉室内の上方
に層流となつて、炉入口方向に流動するため、折
角の高純度の雰囲気ガスも、台板または匣鉢上の
全ての処理物を包含せず、処理物の品質にばらつ
きを生ずる欠点がある。従つて該欠点を補うた
め、状況によつて処理物の処理量を仕様により低
減したり、また雰囲気ガス圧、ガス量を増加し
て、品質の安定化を計つているが、台板や匣鉢に
積載した処理物の内部に、効果的に供給するガス
量の調整が困難であるばかりでなく、生産性も劣
り、ガス量も増加して、従来よりガス雰囲気炉の
免がれ得ない欠点とされていた。
本考案の目的は、台板や匣鉢上の処理物の積載
高、または重ね脚付棚材の数に合せて、雰囲気ガ
スが噴出する細孔を設けた導入管を、処理物に近
接して挿着し、雰囲気ガスを積載処理物の内部迄
導入することにより、熱処理効果、生産性、ガス
量等に係る従来の欠点を全て解消し得る、ガス雰
囲気炉を提供することにある。
即ち本考案によるガス雰囲気炉の構造は、耐熱
鋼またはセラミツク質からなる先端密閉形の管状
体で、該管状体の表面に、雰囲気ガスが水平に噴
出する細孔を設けた導入管を、熱処理炉の天井、
または炉床の断熱壁を貫通し、処理物に近接して
垂直に挿着した構造を特徴とする。
以下本考案の実施例の構造を図面により説明す
る。第１図は従来のガス雰囲気炉本体の側面を示
す断面図で、第２図は本考案による炉本体の側面
を示す断面図、第３図は本考案による雰囲気ガス
導入管の正面を示す断面図である。即ち第１図、
第２図共に、炉殻１、断熱壁２、で炉室を形成
し、レール煉瓦３の上面に、処理物４を積載した
脚付棚材５を、４段積み重ねた台板６を、炉入口
のプツシヤーで、炉内に順次連続装入し、発熱体
７で加熱処理するガス雰囲気炉で、従来炉の第１
図は、断熱壁２の厚さにほぼぼ等しい長さの雰囲
気ガス導入管８を、断熱壁２に挿着した構造で、
第２図の本考案の炉は、第１図と同形同寸の炉
で、第３図に示す導入管１０、即ち処理物４に向
つて、水平にガスを噴出する細孔９を、処理物４
の位置に合せて４個所設けた導入管１０を、天井
壁を貫通し、前記処理物４に近接して垂直に挿着
し、パツキング１１と、止金具１２，１３により
固定した構造である。
次に第１図に示す従来炉と、第２図に示す本考
案炉について、その効果を比較した。即ち前記第
１図、第２図に示す炉は、共に加熱帯４ｍ、均熱
帯５ｍ、冷却帯２ｍからなる、セラミツク質電気
回路素子の焼成用で、焼成温度1300〜1400℃、電
気容量142KWのトンネル形窒素ガス雰囲気炉で、
該炉本体は、幅1240mm、高さ1200mmの炉殻内に、
幅350mm、有効高さ200mmの炉室を形成し、有効高
さの上下に炭化珪素質発熱体を水平に挿着した構
造である。前記炉の内、第１図の従来炉は、炉の
出口開口部に耐熱鋼で、外径34mmφ、内径27.6mm
φの導入管を１個所に挿着し、第２図の本考案炉
は、外径20mmφ、内径15mmφ、長さ850mmのセラ
ミツク質からなる先端密閉管で、該管の表面に処
理物の高さに合せて、1.0〜1.5mmφの細孔を４個
所設けた導入管を、均熱体の処理物を挾み、天井
壁を貫通して、前記細孔と処理物の距離を40mmと
し、処理物の両側に10個所づつ計20個所挿着し
た。前記構造の両炉につき、その効果を比較して
次表の数値を得た。
The present invention relates to continuous or discontinuous gas atmosphere furnaces that require an atmospheric gas such as hydrogen, nitrogen, oxygen or air. Conventionally, the atmosphere gas in gas atmosphere furnaces is piped from a gas cylinder or gas generator installed outside the furnace body to an outlet opening of the furnace body or an inlet pipe inserted into the side wall of the furnace body. A method has been adopted in which gas is released into the furnace from a side wall hole at the end of the introduction tube and made to flow toward the furnace inlet to maintain the atmosphere within the furnace chamber. However, the above-mentioned atmospheric gas supplied into the furnace chamber is heated, expands, lowers its specific gravity, forms a laminar flow above the furnace chamber, and flows toward the furnace inlet. It has the disadvantage that it does not cover all the processed items on the base plate or the sagger, resulting in variations in the quality of the processed items. Therefore, in order to compensate for these drawbacks, depending on the situation, the amount of processed material may be reduced according to specifications, or the atmospheric gas pressure and gas amount may be increased to stabilize quality. Not only is it difficult to effectively adjust the amount of gas supplied to the processed material loaded in the pot, but productivity is also poor and the amount of gas increases, making it impossible to avoid using a gas atmosphere furnace compared to conventional methods. It was considered a drawback. The purpose of this invention is to install an inlet pipe with pores through which atmospheric gas is ejected close to the material to be processed, in accordance with the height of the material to be processed on the base plate or sagger, or the number of shelves with stacked legs. The object of the present invention is to provide a gas atmosphere furnace which can eliminate all the conventional drawbacks related to heat treatment effect, productivity, gas amount, etc. by inserting the gas atmosphere into the loaded workpiece and introducing atmospheric gas into the interior of the loaded workpiece. That is, the structure of the gas atmosphere furnace according to the present invention is a tubular body made of heat-resistant steel or ceramic with a closed end, and an inlet tube provided with pores through which atmospheric gas is ejected horizontally on the surface of the tubular body, which is heat-treated. furnace ceiling,
Alternatively, it is characterized by a structure in which it penetrates the heat insulating wall of the hearth and is inserted vertically close to the object to be processed. The structure of an embodiment of the present invention will be explained below with reference to the drawings. Fig. 1 is a cross-sectional view showing the side surface of a conventional gas atmosphere furnace main body, Fig. 2 is a cross-sectional view showing the side surface of the furnace main body according to the present invention, and Fig. 3 is a cross-sectional view showing the front side of the atmospheric gas introduction pipe according to the present invention. It is a diagram. That is, Figure 1,
In both Figures 2, a furnace chamber is formed by a furnace shell 1 and an insulating wall 2, and a base plate 6, which is made by stacking four levels of legged shelf materials 5 loaded with processed materials 4, is placed on the top surface of the rail brick 3. This is a gas atmosphere furnace in which charging is carried out sequentially into the furnace using a pusher at the inlet, and heat treatment is performed using a heating element 7.
The figure shows a structure in which an atmospheric gas introduction pipe 8 with a length approximately equal to the thickness of the insulating wall 2 is inserted into the insulating wall 2.
The furnace of the present invention shown in FIG. 2 has the same shape and size as that shown in FIG. 1, and has an inlet pipe 10 shown in FIG. Processed material 4
In this structure, four introduction pipes 10 are provided at four locations corresponding to the positions of the pipes 10, which penetrate the ceiling wall, are vertically inserted in close proximity to the object 4, and are fixed with packing 11 and fasteners 12 and 13. Next, the effects of the conventional furnace shown in FIG. 1 and the inventive furnace shown in FIG. 2 were compared. That is, the furnaces shown in Figures 1 and 2 are for firing ceramic electric circuit elements, each consisting of a 4 m heating zone, a 5 m soaking zone, and a 2 m cooling zone, with a firing temperature of 1300 to 1400°C, and an electrical capacity of 142 KW. Tunnel type nitrogen gas atmosphere furnace
The furnace body has a furnace shell with a width of 1240 mm and a height of 1200 mm.
It has a furnace chamber with a width of 350 mm and an effective height of 200 mm, with silicon carbide heating elements inserted horizontally above and below the effective height. Among the above-mentioned furnaces, the conventional furnace shown in Fig. 1 is made of heat-resistant steel at the outlet opening of the furnace, and has an outer diameter of 34 mmφ and an inner diameter of 27.6 mm.
The inventive furnace shown in Fig. 2 has an introductory pipe of φ inserted in one place, and the tip of the furnace is sealed at the tip made of ceramic with an outer diameter of 20 mmφ, an inner diameter of 15 mmφ, and a length of 850 mm. In accordance with this, an inlet pipe with four pores of 1.0 to 1.5 mmφ was inserted between the processed material of the heat equalizer and penetrated through the ceiling wall, so that the distance between the pores and the processed material was 40 mm, A total of 20 locations, 10 locations on each side of the treated object, were inserted. The effects of both furnaces of the above structure were compared and the numerical values shown in the following table were obtained.
【表】
上表のように、本考案によるガス雰囲気炉は、
従来炉に比し、ガス量で半減し、処理量で1.33倍
となり、製品得率は９〜10％の向上を得た。
更に本考案の導入管は、第３図に示す構造であ
るので、ガス噴出細孔の方向を任意且つ容易に調
整し得る効果がある。即ち処理物に対し、直角水
平に、また処理物に対し、炉入口側に向つてやや
角度を付けて水平にガスを噴出させ、積載した処
理物の内部まで高純度の噴出ガスを導入すること
により、処理物空間内の不純物を含むガスを、積
載処理物外に排除し、炉入口に流動させて炉外に
排出する為の、導入管の噴出角度を、容易に調整
することができる。
以上のように本考案は、極めて簡単な構造で、
且つ安価な導入管を炉に挿着することにより、ガ
ス量の低減と、製品得率の向上に加え、生産量の
増大も可能となり、その効果は極めて大なるもの
がある。[Table] As shown in the table above, the gas atmosphere furnace according to the present invention is
Compared to conventional furnaces, the gas volume has been halved, the throughput has been increased 1.33 times, and the product yield has improved by 9 to 10%. Furthermore, since the introduction pipe of the present invention has the structure shown in FIG. 3, it has the advantage that the direction of the gas ejection pores can be arbitrarily and easily adjusted. In other words, the gas is ejected horizontally at right angles to the processed material, or horizontally at a slight angle toward the furnace inlet, and the high-purity ejected gas is introduced into the loaded processed material. Accordingly, it is possible to easily adjust the ejection angle of the inlet pipe for expelling the gas containing impurities in the processing material space to the outside of the loaded processing material, flowing it to the furnace inlet, and discharging it outside the furnace. As mentioned above, the present invention has an extremely simple structure,
In addition, by inserting an inexpensive introduction tube into the furnace, it is possible to reduce the amount of gas, improve the product yield, and increase the production amount, which has extremely large effects.
【図面の簡単な説明】[Brief explanation of the drawing]
第１図は従来のガス雰囲気炉本体の断面図で、
第２図は本考案による炉本体の断面図、第３図は
本考案による雰囲気ガス導入管の断面図である。
２……断熱壁、３……レール煉瓦、４……処理
物、５……脚付棚材、６……台板、７……発熱
体、８，１０……ガス導入管、９……細孔。
Figure 1 is a cross-sectional view of the main body of a conventional gas atmosphere furnace.
FIG. 2 is a cross-sectional view of the furnace body according to the present invention, and FIG. 3 is a cross-sectional view of the atmospheric gas introduction pipe according to the present invention. 2...Insulating wall, 3...Rail brick, 4...Processing material, 5...Shelf material with legs, 6...Bedboard, 7...Heating element, 8, 10...Gas introduction pipe, 9... pore.