JP2781537B2 - Atmospheric circulation type heat treatment furnace - Google Patents
Atmospheric circulation type heat treatment furnaceInfo
- Publication number
- JP2781537B2 JP2781537B2 JP7278716A JP27871695A JP2781537B2 JP 2781537 B2 JP2781537 B2 JP 2781537B2 JP 7278716 A JP7278716 A JP 7278716A JP 27871695 A JP27871695 A JP 27871695A JP 2781537 B2 JP2781537 B2 JP 2781537B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- atmosphere
- baffle
- heat treatment
- type heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B29/00—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins
- C03B29/02—Reheating glass products for softening or fusing their surfaces; Fire-polishing; Fusing of margins in a discontinuous way
- C03B29/025—Glass sheets
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ガラス製品の熱処
理に適した雰囲気循環式熱処理炉に関するものである。The present invention relates to an atmosphere circulation type heat treatment furnace suitable for heat treatment of glass products.
【０００２】[0002]
【従来の技術】従来、一般に、雰囲気循環式熱処理炉と
しては、図７に示すように、炉１内にバッフル２を設け
て炉壁との間に雰囲気循環路３を形成し、炉天井に設け
た循環ファン４により炉内雰囲気を循環するとともに、
炉内雰囲気をバーナ等の加熱手段５で昇温したのち炉内
底部から上方に向かって吹き出し、メッシュベルトから
なるコンベアベルト６上に載置された処理材（図示せ
ず）を熱処理するようになっている。なお、７は多孔板
からなる支持板である。2. Description of the Related Art Conventionally, as an atmosphere circulation type heat treatment furnace, generally, as shown in FIG. 7, a baffle 2 is provided in a furnace 1 to form an atmosphere circulation path 3 between the furnace wall and a furnace ceiling. The atmosphere in the furnace is circulated by the circulating fan 4 provided,
After the furnace atmosphere is heated by a heating means 5 such as a burner, it is blown upward from the furnace bottom to heat-treat a processing material (not shown) placed on a conveyor belt 6 made of a mesh belt. Has become. Reference numeral 7 denotes a support plate made of a perforated plate.
【０００３】ところで、コンベアベルト上の処理材を均
一に熱処理するためには、循環雰囲気が十分に混合され
て均一温度となっていること、循環雰囲気が均一に処理
材に接触すること、バッフル２にて偏流を生じないこと
が必要である。しかしながら、前記従来のものでは、炉
内循環雰囲気が両側に位置する雰囲気循環路３の下部か
らコンベアベルト６の下部に供給されて、コンベアベル
ト６からバッフル２内に吹き出すため、処理材の部位間
において、雰囲気に接する部位と接しない部位とが生じ
るばかりか、炉幅方向および炉長方向に均一に吹き出さ
ない。また、バーナ等の加熱手段５によって加熱された
雰囲気が直接バッフル２内に供給するため、前記吹き出
し量の不均一性と相俟って、炉幅方向および炉長方向に
おける炉内雰囲気に±１５℃もの温度差が生じ、処理材
を均一に熱処理することは非常に困難であるという問題
を有していた。このことは、徐冷帯および冷却帯でも同
様である。By the way, in order to uniformly heat-treat the processing material on the conveyor belt, it is necessary that the circulating atmosphere is sufficiently mixed to have a uniform temperature, that the circulating atmosphere uniformly contacts the processing material, and that the baffle 2 It is necessary that the drift does not occur. However, in the conventional apparatus, the furnace circulation atmosphere is supplied from the lower part of the atmosphere circulation path 3 located on both sides to the lower part of the conveyor belt 6 and blows out from the conveyor belt 6 into the baffle 2. In addition, not only a part in contact with the atmosphere and a part not in contact with the atmosphere occur, but also the air does not blow out uniformly in the furnace width direction and the furnace length direction. Further, since the atmosphere heated by the heating means 5 such as a burner is supplied directly into the baffle 2, the atmosphere in the furnace in the furnace width direction and the furnace length direction is ± 15% in combination with the non-uniformity of the blowing amount. There was a problem that a temperature difference of as much as ° C. was generated, and it was extremely difficult to heat treat the treated material uniformly. This is the same in the slow cooling zone and the cooling zone.
【０００４】そこで、炉天井部に循環ファンを設け、こ
の循環ファンと炉内に設けたバッフルにより雰囲気循環
路を形成し、前記循環ファンの下方に１枚あるいは所定
間隔をもって２枚の多孔板を配設し、循環ファンからの
雰囲気を前記多孔板を介して均一に吹き出させようとす
る雰囲気循環式熱処理炉も提案されている。Therefore, a circulation fan is provided on the ceiling of the furnace, an atmosphere circulation path is formed by the circulation fan and a baffle provided in the furnace, and one or two perforated plates are provided below the circulation fan at a predetermined interval. An atmosphere circulation type heat treatment furnace is also proposed, which is disposed to uniformly blow out the atmosphere from a circulation fan through the perforated plate.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、前記多
孔板を設けた構成においても、多孔板から吹き出す雰囲
気の風速分布は均一にならず、２枚の多孔板を配設する
ものではやや均一化されるものの圧力損失が大きくなる
ため、循環ファンを大型化せざるを得ないという課題を
有する。本発明者らは、風速分布の不均一性について検
討したところ、循環ファン（ＲＣファン）１７の特性
は、図５に示すように、羽根１８の中心部を除く内端部
側の風速（風量）が一番強く、外方に向かって徐々に弱
くなる特性を有しているため、多孔板の孔だけではこれ
ら風量差を十分吸収できないためであることを見出し
た。したがって、本発明は循環ファンの下方に雰囲気を
分散させる手段を設けることにより前記課題を解決する
雰囲気循環式熱処理炉を提供することを目的とする。However, even in the configuration in which the perforated plate is provided, the wind speed distribution of the atmosphere blown out of the perforated plate is not uniform, and in the case where two perforated plates are provided, it is somewhat uniform. However, since the pressure loss increases, there is a problem that the circulation fan must be increased in size. The present inventors have studied the non-uniformity of the wind speed distribution. As shown in FIG. 5, the characteristics of the circulation fan (RC fan) 17 are as shown in FIG. ) Is the strongest and has the property of gradually weakening outward, so that it is not possible to sufficiently absorb the difference in air flow with only the holes of the perforated plate. Therefore, an object of the present invention is to provide an atmosphere circulation type heat treatment furnace which solves the above-mentioned problem by providing means for dispersing the atmosphere below the circulation fan.
【０００６】[0006]
【課題を解決するための手段】本発明は、前記目的を達
成するために、炉内天井部に設けた循環ファンと炉内に
設けたバッフルにより雰囲気循環路を形成した雰囲気循
環式熱処理炉において、前記循環ファンの下方にドーナ
ツ状の邪魔板を配設するとともに、この邪魔板の下方に
前記バッフル内を上下に区画する多孔板を設け、炉内雰
囲気を前記多孔板を介して下方に噴出させるようにした
ものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an atmosphere circulation type heat treatment furnace in which an atmosphere circulation path is formed by a circulation fan provided in a furnace ceiling and a baffle provided in the furnace. A donut-shaped baffle plate is provided below the circulation fan, and a perforated plate is provided below the baffle plate to partition the inside of the baffle up and down, and the atmosphere in the furnace is jetted downward through the perforated plate. It is intended to be.
【０００７】[0007]
【発明の実施の形態】つぎに、本発明の実施の形態を図
１〜図３にしたがって説明する。本発明が適用される雰
囲気循環式熱処理炉Ｔは、図２に示すように、加熱・均
熱帯１０、徐冷帯２６および冷却帯２９とからなり、処
理材はコンベアベルト６によって前記各帯域を搬送さ
れ、その間に熱処理されるものである。なお、前記各帯
域は、複数の単位帯域１０Ａ，２６Ａ，２９Ａからなっ
ている。Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 2, the atmosphere circulation type heat treatment furnace T to which the present invention is applied is composed of a heating / soaking zone 10, a slow cooling zone 26, and a cooling zone 29. It is transported and heat treated during that time. Each of the bands includes a plurality of unit bands 10A, 26A, and 29A.
【０００８】前記加熱・均熱帯１０の単位帯域１０Ａ
は、大略、図１に示すように、耐火断熱材からなる炉本
体１１の炉内に設けたバッフル１３と循環ファン１７と
加熱手段であるバーナ１９とからなる。このバーナ１９
はラジアントチューブあるいは電熱ヒータであってもよ
い。[0008] The unit band 10A of the heating and leveling 10
1, comprises a baffle 13 provided in the furnace of a furnace main body 11 made of a refractory heat insulating material, a circulation fan 17, and a burner 19 serving as a heating means. This burner 19
May be a radiant tube or an electric heater.
【０００９】そして、前記バッフル１３は、両側に側板
１４を有するとともに、上面は舟底天井１５となってお
り、このバッフル１３は炉天井から吊持固定されてい
る。また、側板１４と炉底部との間および炉側壁との間
には、それぞれ空間が設けられる一方、炉天井に取り付
けられた循環ファン１７の羽根１８が、前記天井１５部
に位置して、前記空間とで炉内雰囲気循環路（以下、循
環路という）１６を形成している。The baffle 13 has side plates 14 on both sides, and the upper surface is a boat bottom ceiling 15, and the baffle 13 is suspended and fixed from the furnace ceiling. Further, spaces are provided between the side plate 14 and the furnace bottom and between the furnace side wall, and the blades 18 of the circulation fan 17 attached to the furnace ceiling are located at the ceiling 15, The space forms a furnace atmosphere circulation path (hereinafter, referred to as a circulation path) 16.
【００１０】そして、前記循環ファン１７の下方にドー
ナツ状の邪魔板２０を配設するとともに、この邪魔板２
０の下方に前記バッフル１３内を上下に区画する多孔板
２４を設けている。A donut-shaped baffle plate 20 is provided below the circulation fan 17 and the baffle plate 2
Below 0, a perforated plate 24 is provided which partitions the inside of the baffle 13 up and down.
【００１１】ところで、前記邪魔板２０は開孔率３８．
２％の多数の孔Ｈ1を有する多孔板（パンチングメタ
ル）からなり、図３，４に示すように中心に開口を有す
るドーナツ状のもので、円周を８等分するように８枚の
Ｌ字状リブ２２が取り付けられている。なお、実施例に
おいては、この邪魔板２０は２分割構造となっており、
一片２０ａを吊りボルト２３により吊り下げたのち、他
片２０ｂを同様に吊り下げ、その後、リブ２２，２２を
リベット等により一体化したものである。また、前記邪
魔板２０の直径は、前記循環ファン１７の羽根径を１と
すると、１．５であり、かつ、開口２１の直径は前記羽
根胴部径ｄの０．７〜０．８としてある。The baffle plate 20 has an aperture ratio of 38.
Porous plate having a number of holes H 1 2% consists (punching metal), those donut-shaped having an opening at the center as shown in FIGS. 3 and 4, the eight to the circumference 8 equal parts An L-shaped rib 22 is attached. In the embodiment, the baffle plate 20 has a two-part structure.
After one piece 20a is hung by the hanging bolt 23, the other piece 20b is hung in the same manner, and then the ribs 22, 22 are integrated by rivets or the like. The diameter of the baffle plate 20 is 1.5 when the blade diameter of the circulation fan 17 is 1, and the diameter of the opening 21 is 0.7 to 0.8 of the blade body diameter d. is there.
【００１２】つぎに、前記構成からなる雰囲気循環式熱
処理炉の操業について述べる。まず、加熱・均熱帯１０
においては、バーナ１９を燃焼させて循環ファン１７を
回転すると、炉内雰囲気は循環路１６を矢印で示すよう
に循環し、所定温度に加熱された炉内雰囲気は、循環フ
ァン１７により吸引撹拌されてバッフル１３内で前記邪
魔板２０に向けて吹き出すことになる。Next, the operation of the atmospheric circulation type heat treatment furnace having the above-described configuration will be described. First, heating and level tropical 10
When the circulating fan 17 is rotated by burning the burner 19, the furnace atmosphere circulates through the circulation path 16 as indicated by the arrow, and the furnace atmosphere heated to a predetermined temperature is suction-stirred by the circulating fan 17. Thus, the air blows out toward the baffle plate 20 in the baffle 13.
【００１３】この場合において、前記循環ファン１７か
ら吹き出す風量は前述の通り、羽根１８の中心部を除く
内端部において多いが、前記邪魔板２０により遮られ、
かつ、リブ２２の存在により一方向に片寄ることなく放
射状に均一に外方に流れるとともに、中央部では、その
一部が邪魔板２０の孔Ｈ1から下方に吹き出し、その
後、多孔板２４の孔Ｈ2によって整流されて多孔板２４
からほぼ均一流量（風量）で下方へ真直に吹き出すこと
になる。図６（Ａ）は炉巾方向の風速分布、図６（Ｂ）
は炉長手方向の風速分布を示し、図からも明らかなよう
に、全体として多孔板２４からの流量はほぼ均一となっ
ている。In this case, the amount of air blown out from the circulation fan 17 is large at the inner end except for the center of the blade 18 as described above, but is blocked by the baffle plate 20.
And, together with the uniform flow radially outwardly without biased in one direction by the presence of the ribs 22, the central portion, partly blown out of the hole H 1 of the baffle plate 20 downwardly, then the hole of the perforated plate 24 Perforated plate 24 rectified by H 2
And blows straight down at a substantially uniform flow rate (air volume). Fig. 6 (A) is a wind speed distribution in the furnace width direction, Fig. 6 (B)
Indicates the wind speed distribution in the longitudinal direction of the furnace, and as is clear from the figure, the flow rate from the perforated plate 24 is substantially uniform as a whole.
【００１４】なお、前記説明は加熱・均熱帯１０につい
て説明したが、徐冷帯２６においては、バッフル１３の
上方に大気を導入する冷却ダクトを設けるとともに、多
孔板上方のバッフル空間に排気ダクトを設け、炉内循環
雰囲気温度を、バーナ１９の燃焼量、冷却ダクトからの
大気等の量および排気ダクトからの排気量を調節して所
定温度にするようにする。また、冷却帯２９において
は、徐冷帯２６の構造において、バーナをなくするとと
もに炉本体１１を非断熱構造とすればよい。In the above description, the heating / uniform tropical zone 10 has been described. In the slow cooling zone 26, a cooling duct for introducing the atmosphere is provided above the baffle 13, and an exhaust duct is provided for the baffle space above the perforated plate. The temperature of the circulating atmosphere in the furnace is adjusted to a predetermined temperature by adjusting the combustion amount of the burner 19, the amount of the atmosphere from the cooling duct and the amount of exhaust from the exhaust duct. In the cooling zone 29, the burner may be eliminated and the furnace body 11 may have a non-insulated structure in the structure of the slow cooling zone 26.
【００１５】[0015]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、循環ファンの下方にドーナツ状の邪魔板を配設
したため、中央部の大流量は外方に流れて、直接多孔板
を介して流入せず、全体として循環ファンから下方にほ
ぼ均一に吹き出す。なお、邪魔板を多孔板で構成すれ
ば、より整流されるため、より流量分布が均一となる。
また、バッフル内を上下に区画する多孔板は１枚である
ため、２枚のものに比べて圧損が少なく、それだけ循環
ファン駆動モータの容量も小さいものとすることができ
る。As is apparent from the above description, according to the present invention, since the donut-shaped baffle plate is disposed below the circulation fan, a large flow rate at the center portion flows outward, and the perforated plate is directly provided. Does not flow through the circulating fan but blows out almost uniformly downward as a whole. If the baffle plate is formed of a perforated plate, the flow is more rectified and the flow rate distribution becomes more uniform.
In addition, since the number of perforated plates dividing the inside of the baffle up and down is one, the pressure loss is smaller than that of the two plates, and the capacity of the circulation fan drive motor can be reduced accordingly.
【図１】 加熱・均熱帯の断面図。FIG. 1 is a cross-sectional view of a heated / uniform tropical zone.
【図２】 雰囲気循環式熱処理炉の概略平面図。FIG. 2 is a schematic plan view of an atmosphere circulation type heat treatment furnace.
【図３】 図１の邪魔板の平面図。FIG. 3 is a plan view of the baffle plate of FIG. 1;
【図４】 図３のＩＶ−ＩＶ線断面図。FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;
【図５】 循環ファンの風量の状態を示す説明図。FIG. 5 is an explanatory diagram showing a state of air volume of a circulation fan.
【図６】 （Ａ）は図２の加熱・均熱帯における循環フ
ァンを中心とする炉巾方向の風量分布図、（Ｂ）は炉長
方向の風量分布図。6 (A) is an air flow distribution diagram in the furnace width direction centering on the circulation fan in the heating / uniform tropics of FIG. 2, and FIG.
【図７】 従来の雰囲気循環式熱処理炉の断面図。FIG. 7 is a cross-sectional view of a conventional atmosphere circulation type heat treatment furnace.
１０Ａ…加熱・均熱帯、１１…炉本体、１３…バッフ
ル、１７…循環ファン、１８…羽根、１９…バーナ、２
０…邪魔板、２１…開口、２２…リブ、２３…吊りボル
ト、２４…多孔板、Ｈ1，Ｈ2…孔。10A: heating / uniform tropicalization, 11: furnace body, 13: baffle, 17: circulation fan, 18: blade, 19: burner, 2
0 ... baffles 21 ... opening, 22 ... rib, 23 ... hanger rod, 24 ... porous plate, H 1, H 2 ... hole.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭58−12985（ＪＰ，Ａ) 特開 平６−323755（ＪＰ，Ａ) 特開 平６−323756（ＪＰ，Ａ) 実開 平５−77246（ＪＰ，Ｕ) 実公 昭52−31687（ＪＰ，Ｙ２) (58)調査した分野(Int.Cl.6，ＤＢ名) C03B 27/012 C21D 1/767 F27B 9/10 F27B 9/30──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-12985 (JP, A) JP-A-6-323755 (JP, A) JP-A-6-323756 (JP, A) 77246 (JP, U) Jikken 52-31687 (JP, Y2) (58) Fields investigated (Int. Cl. 6 , DB name) C03B 27/012 C21D 1/767 F27B 9/10 F27B 9/30
Claims (1)
設けたバッフルにより雰囲気循環路を形成した雰囲気循
環式熱処理炉において、前記循環ファンの下方にドーナ
ツ状の邪魔板を配設するとともに、この邪魔板の下方に
前記バッフル内を上下に区画する多孔板を設け、炉内雰
囲気を前記多孔板を介して下方に噴出させるようにした
ことを特徴とする雰囲気循環式熱処理炉。1. An atmosphere circulation type heat treatment furnace in which an atmosphere circulation path is formed by a circulation fan provided in a furnace ceiling and a baffle provided in the furnace, a donut-shaped baffle plate is disposed below the circulation fan. An atmosphere circulation type heat treatment furnace, wherein a perforated plate for vertically dividing the inside of the baffle is provided below the baffle plate, and an atmosphere in the furnace is blown downward through the perforated plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7278716A JP2781537B2 (en) | 1995-10-26 | 1995-10-26 | Atmospheric circulation type heat treatment furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7278716A JP2781537B2 (en) | 1995-10-26 | 1995-10-26 | Atmospheric circulation type heat treatment furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09118533A JPH09118533A (en) | 1997-05-06 |
| JP2781537B2 true JP2781537B2 (en) | 1998-07-30 |
Family
ID=17601204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7278716A Expired - Fee Related JP2781537B2 (en) | 1995-10-26 | 1995-10-26 | Atmospheric circulation type heat treatment furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2781537B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102897533B (en) * | 2012-10-23 | 2014-11-12 | 昆山特力伯传动科技有限公司 | Conveyor belt heating method |
| CN103951176B (en) * | 2014-04-11 | 2016-06-15 | 洛阳兰迪玻璃机器股份有限公司 | The process furnace of a kind of rapid heating sheet glass |
| CN107631600A (en) * | 2017-11-03 | 2018-01-26 | 天津市三木森电炉股份有限公司 | A kind of fireproof material drying oven |
-
1995
- 1995-10-26 JP JP7278716A patent/JP2781537B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09118533A (en) | 1997-05-06 |
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