JP2005265324A - Induction heating device - Google Patents
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- JP2005265324A JP2005265324A JP2004079616A JP2004079616A JP2005265324A JP 2005265324 A JP2005265324 A JP 2005265324A JP 2004079616 A JP2004079616 A JP 2004079616A JP 2004079616 A JP2004079616 A JP 2004079616A JP 2005265324 A JP2005265324 A JP 2005265324A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 109
- 230000006698 induction Effects 0.000 title claims abstract description 57
- 230000001681 protective effect Effects 0.000 claims description 28
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 230000020169 heat generation Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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Abstract
Description
本発明は、誘導加熱炉内における被加熱体の隅部に近接して発熱体が設置された誘導加熱装置に関する。特に、被加熱体のサイズにより誘導加熱炉内の内壁と被加熱体の距離が変化する場合に適用される。
例えば、スラブ等の被加熱体を取り巻くように巻かれた誘導加熱コイルを有する誘導加熱装置に関する。
The present invention relates to an induction heating apparatus in which a heating element is installed in the vicinity of a corner of an object to be heated in an induction heating furnace. In particular, it is applied when the distance between the inner wall of the induction heating furnace and the heated body changes depending on the size of the heated body.
For example, the present invention relates to an induction heating apparatus having an induction heating coil wound so as to surround a heated object such as a slab.
スラブ等の被加熱体を取り巻くように巻かれた誘導加熱コイルを有する誘導加熱装置において、被加熱体からの抜熱を防止する方法に関しては従来から種々の提案がなされている。
例えば、実開昭61-39149号公報には、誘導加熱装置において被加熱体の隅部に近接して発熱体を配設せしめたことを特徴とする誘導加熱装置が開示されている。
しかし、実開昭61-39149号公報に記載された従来技術では、発熱体が長時間の使用で曲がってしまうため耐久性に問題があった。
また、発熱温度に対するスラブ抜熱が大き過ぎるため発熱効率が低いという問題があり、実機に採用することはできなかった。
In an induction heating apparatus having an induction heating coil wound around a heated object such as a slab, various proposals have conventionally been made regarding methods for preventing heat removal from the heated object.
For example, Japanese Utility Model Publication No. 61-39149 discloses an induction heating apparatus in which a heating element is disposed in the induction heating apparatus in the vicinity of the corner of the object to be heated.
However, the conventional technique described in Japanese Utility Model Publication No. 61-39149 has a problem in durability because the heating element bends after long-term use.
Moreover, since the slab heat removal with respect to the heat generation temperature is too large, there is a problem that the heat generation efficiency is low, and it cannot be adopted in an actual machine.
また、特開平1-67888号公報には、誘導加熱装置において昇降自在な板状の耐火断熱材を有するものが開示されている。
さらに、特開平3-31422号公報には、誘導加熱装置においてスラブの両端部にコイル電流で誘導加熱できるＦｅ系素材による発熱保温板を近接させることを特徴とするものが開示されている。
しかし、この特開平1-67888号公報や特開平3-31422号公報に記載された従来技術は自己発熱タイプではなくスラブ抜熱を十分に抑制することは困難であった。
Further, Japanese Patent Application Laid-Open No. 3-31422 discloses an induction heating device characterized in that a heat-generating heat insulating plate made of an Fe-based material that can be induction-heated by a coil current is brought close to both ends of a slab.
However, the prior art described in Japanese Patent Laid-Open No. 1-67888 and Japanese Patent Laid-Open No. 3-31422 is not a self-heating type, and it has been difficult to sufficiently suppress slab heat removal.
本発明は、前述のような従来技術の問題点を解決し、誘導加熱炉内における被加熱体の隅部に近接して発熱体が設置された誘導加熱装置において、発熱体の耐久性を向上させ、被加熱体の抜熱を抑制することができる誘導加熱装置を提供することを課題とする。 The present invention solves the problems of the prior art as described above, and improves the durability of the heating element in the induction heating apparatus in which the heating element is installed close to the corner of the heated object in the induction heating furnace. An object of the present invention is to provide an induction heating device that can suppress heat removal from a heated body.
本発明は、前述の課題を解決するために鋭意検討の結果、発熱体に保護管を設け、この保護管を誘導加熱炉の内壁に埋め込むことによって、発熱体の耐久性を向上させ、被加熱体の抜熱を抑制することができる誘導加熱装置を提供するものであり、その要旨とするところは特許請求の範囲に記載した通りの下記内容である。
（１）誘導加熱炉内における被加熱体の隅部に近接して発熱体が設置された誘導加熱装置であって、
前記発熱体を保護管内に設置することにより、該発熱体を前記誘導加熱炉の炉内雰囲気から遮断することを特徴とする誘導加熱装置。
（２）前記保護管の略１／２が前記誘導加熱炉内の内壁に埋め込まれていることを特徴とする（１）に記載の誘導加熱装置。
（３）前記保護管の埋め込み長さ（Ｌ）が被加熱体の厚さ（Ｔ）の１倍以上であることを特徴とする（１）または（２）に記載の誘導加熱装置。
（４）前記保護管としてＳｉＣを用いることを特徴とする（１）乃至（３）に記載の誘導加熱装置。
（５）前記発熱体の出力を被加熱体と前記誘導加熱炉の内壁との距離（Δｌ）に応じて変更させる出力変更手段を有することを特徴とする（１）乃至（４）に記載の誘導加熱装置。
As a result of intensive studies to solve the above-mentioned problems, the present invention improves the durability of the heating element by providing a protective tube in the heating element and embedding this protective tube in the inner wall of the induction heating furnace. The present invention provides an induction heating apparatus that can suppress heat removal from the body, and the gist thereof is as follows.
(1) An induction heating apparatus in which a heating element is installed in the vicinity of a corner of an object to be heated in an induction heating furnace,
An induction heating apparatus characterized in that the heating element is isolated from the furnace atmosphere of the induction heating furnace by installing the heating element in a protective tube.
(2) The induction heating apparatus according to (1), wherein approximately half of the protective tube is embedded in an inner wall of the induction heating furnace.
(3) The induction heating apparatus according to (1) or (2), wherein the embedded length (L) of the protective tube is one or more times the thickness (T) of the object to be heated.
(4) The induction heating apparatus according to any one of (1) to (3), wherein SiC is used as the protective tube.
(5) The apparatus according to any one of (1) to (4), further including output changing means for changing the output of the heating element in accordance with a distance (Δl) between an object to be heated and an inner wall of the induction heating furnace. Induction heating device.
本発明によれば、発熱体に保護管を設け、この保護管を誘導加熱炉の内壁に埋め込むことによって、発熱体の耐久性を向上させ、被加熱体の抜熱を抑制することができる誘導加熱装置を提供することができる。
具体的には、誘導加熱装置において被加熱体を均一に加熱することができるうえ、発熱体の耐久性も向上し、被加熱体の抜熱も最小限に食い留めることができるなど、産業上有用な著しい効果を奏する。
According to the present invention, a protective tube is provided on the heating element, and the protective tube is embedded in the inner wall of the induction heating furnace, thereby improving the durability of the heating element and suppressing heat removal from the heated body. A heating device can be provided.
Specifically, in the induction heating device, the heated body can be heated uniformly, the durability of the heating element is improved, and the heat removal from the heated body can be kept to a minimum. Useful and significant effect.
発明を実施するための最良の形態について、図１乃至図３を用いて詳細に説明する。
図１は、本発明の誘導加熱装置の実施形態を例示する図で、誘導加熱炉内の一内壁と被加熱体の位置関係を示したものである。
図１において、１は被加熱体、２は内壁を示す。
図１に示すように、スラブ等の被加熱体１は、誘導加熱炉の炉内に設置され、内壁２に埋め込まれた誘導加熱コイルによって加熱される。
本発明においては、誘導加熱炉内における被加熱体１の隅部に近接して発熱体が設置されており、この発熱体を保護管３の内部に設置することにより、該発熱体１を前記誘導加熱炉の炉内雰囲気から遮断することを特徴とする。
発熱体１が酸化性の炉内雰囲気にさらされると、発熱体１が腐食するため、発熱体１を保護管３の内部に設置し、該発熱体１を前記誘導加熱炉の炉内雰囲気から遮断することによって、発熱体１の腐食を防止することができる。
また、図１に示すように、保護管３の略１／２を誘導加熱炉内の内壁２に埋め込むことによって、発熱体が発生する熱量を被加熱体に優先的に投入することができるうえ、保護管３の温度変化による変形を防止して、保護管３の耐久性を著しく向上させることができる。
The best mode for carrying out the invention will be described in detail with reference to FIGS.
FIG. 1 is a diagram illustrating an embodiment of an induction heating apparatus according to the present invention, and shows the positional relationship between one inner wall in an induction heating furnace and an object to be heated.
In FIG. 1, 1 is a to-be-heated body, 2 shows an inner wall.
As shown in FIG. 1, a heated object 1 such as a slab is installed in a furnace of an induction heating furnace and heated by an induction heating coil embedded in an inner wall 2.
In the present invention, a heating element is installed in the induction heating furnace in the vicinity of the corner of the heated object 1, and by installing this heating element inside the protective tube 3, the heating element 1 is It is characterized by shielding from the furnace atmosphere of the induction heating furnace.
When the heating element 1 is exposed to an oxidizing furnace atmosphere, the heating element 1 is corroded. Therefore, the heating element 1 is installed inside the protective tube 3, and the heating element 1 is removed from the furnace atmosphere of the induction heating furnace. By blocking, corrosion of the heating element 1 can be prevented.
Moreover, as shown in FIG. 1, by embedding approximately half of the protective tube 3 in the inner wall 2 in the induction heating furnace, the amount of heat generated by the heating element can be preferentially input to the object to be heated. The deformation of the protective tube 3 due to temperature changes can be prevented, and the durability of the protective tube 3 can be significantly improved.
さらに、保護管３の埋め込み長さ（Ｌ）を被加熱体の厚さ（Ｔ）の１倍以上とすることによって、被加熱体１からの抜熱を著しく低減することができる。
本発明においては、保護管３の材質は問わないが、ＳｉＣを用いることによって、被加熱体の加熱毎の周期的温度昇降に起因する熱応力変形に耐えうる設備とすることができ、さらに耐久性を向上させることができる。
ここに、被加熱体１の隅部とは、被加熱体１の辺（エッジ）または角部をいう。
また、本発明における発熱体は、被加熱体の隅部を無酸化加熱できればよく、発熱体の種類は問わない。
なお、本発明は、被加熱体１の隅部と内壁２との距離（Δｌ）が被加熱体１のサイズ等により変化する場合特に有効である。従って、図１については、この他の内壁についても本位置関係を適用しても何ら差し支えない。また、被加熱体１の隅部と内壁２との距離（Δｌ）が余り変化しない辺については、通常の内壁のみでも構わない。
Furthermore, heat removal from the heated body 1 can be remarkably reduced by setting the embedded length (L) of the protective tube 3 to be equal to or greater than one time the thickness (T) of the heated body.
In the present invention, the material of the protective tube 3 is not limited, but by using SiC, it is possible to provide a facility that can withstand the thermal stress deformation caused by the periodic temperature rise and fall at every heating of the heated object, and further durable. Can be improved.
Here, the corner of the heated body 1 refers to a side (edge) or a corner of the heated body 1.
Moreover, the heat generating body in this invention should just be a non-oxidative heating of the corner part of a to-be-heated body, and the kind of heat generating body is not ask | required.
The present invention is particularly effective when the distance (Δl) between the corner of the heated body 1 and the inner wall 2 varies depending on the size of the heated body 1 and the like. Therefore, as for FIG. 1, the present positional relationship can be applied to the other inner walls. Further, only the normal inner wall may be used as the side where the distance (Δl) between the corner of the heated body 1 and the inner wall 2 does not change much.
図２は、本発明の誘導加熱装置における発熱体の設置状況を示す詳細図であり、上段は縦断面図、下段は横断面図を示す。
図２において、２は内壁、３は保護管、４は熱電対、５は発熱体を示す。
図２に示すように、保護管３の直径Ｄの略１／２に相当するＲだけ内壁２に埋め込むことによって、保護管３に温度変化による曲げ応力がかかりにくくなるので保護管３の耐久性を著しく向上させることができる。
また、保護管３の内部に熱電対４を設けることによって、保護管３の内部の温度を検出し、これによって発熱体５の出力を調節することによって、被加熱体１の隅部と内壁２との距離（Δｌ）に応じて発熱体５の出力を変更させることができるので、発熱体５の発熱効率を向上させることができるうえ、被加熱体１からの抜熱を均一化させることができる。
図３は、被加熱体１の隅部と内壁２との距離（Δｌ）と被加熱体の中央部と端部との温度差の関係を示す図であり、横軸は被加熱体１の隅部と内壁２との距離（Δｌ）、縦軸は被加熱体の中央部と端部との温度差（℃）を示す。
図３に示すように、ヒーター（発熱体）を設置した場合は、ヒーター（発熱体）を設置しない場合に比べて被加熱体の中央部と端部との温度差（℃）を著しく低めることができる。
さらに、ヒーター（発熱体）の出力制御を行うことによって、被加熱体１の隅部と内壁２との距離（Δｌ）変化に依存せず、被加熱体の中央部と端部との温度差をほぼ一定に制御することができる。
FIG. 2 is a detailed view showing the state of installation of the heating element in the induction heating apparatus of the present invention, wherein the upper part shows a longitudinal sectional view and the lower part shows a transverse sectional view.
In FIG. 2, 2 is an inner wall, 3 is a protective tube, 4 is a thermocouple, and 5 is a heating element.
As shown in FIG. 2, by burying only R corresponding to approximately ½ of the diameter D of the protective tube 3 in the inner wall 2, bending stress due to temperature change is less likely to be applied to the protective tube 3. Can be significantly improved.
Further, by providing the thermocouple 4 inside the protective tube 3, the temperature inside the protective tube 3 is detected, and by adjusting the output of the heating element 5 thereby, the corner and the inner wall 2 of the heated body 1 are detected. The output of the heating element 5 can be changed according to the distance (Δl) between the heating element 5 and the heat generation efficiency of the heating element 5 can be improved, and the heat removal from the heated body 1 can be made uniform. it can.
FIG. 3 is a diagram showing the relationship between the distance (Δl) between the corner of the body 1 to be heated and the inner wall 2 and the temperature difference between the center and the end of the body to be heated. The distance (Δl) between the corner and the inner wall 2 and the vertical axis indicate the temperature difference (° C.) between the center and the end of the heated object.
As shown in FIG. 3, when a heater (heating element) is installed, the temperature difference (° C.) between the central portion and the end of the heated object is significantly lower than when no heater (heating element) is installed. Can do.
Further, by controlling the output of the heater (heating element), the temperature difference between the central portion and the end portion of the heated body does not depend on the change in the distance (Δl) between the corner of the heated body 1 and the inner wall 2. Can be controlled almost constant.
図１および図２に示す本発明の誘導加熱装置にて被加熱体としてスラブを用い、そのスラブサイズを変更することにより、スラブを内壁との距離を0.5ｍとする加熱A と、スラブを内壁との距離を1.5ｍとする加熱Bの２つの条件にて1300℃に加熱した結果を表１に示す。
表１の耐久性の評価は発熱体の連続使用時間を基準として、×は1日、 △は1週間、○は1ヶ月、◎は1年以上であり、ΔTはスラブ中央部と隅部との温度差を示す。
No.1〜No.4は、発熱体の設置例であり、発熱体を設置しない比較例No.5と比べてスラブ中央部と隅部の温度差ΔＴが著しく低減している。
No.1〜No.3は、発熱体に保護管を設けた本発明例であり、保護管の略１/２を内壁に埋め込んだため、保護管を設けていない比較例であるNo.4に比べて耐久性が著しく向上している。
また、スラブサイズに応じて発熱体の出力変更を行ったNo.2およびNo.3においては、スラブ中央部と隅部との温度差ΔＴを著しく低減することができることが確認された。
The durability evaluation in Table 1 is based on the continuous use time of the heating element, x is 1 day, △ is 1 week, ○ is 1 month, ◎ is 1 year or more, and ΔT is the center and corner of the slab. The temperature difference is shown.
No. 1 to No. 4 are installation examples of heating elements, and the temperature difference ΔT between the slab center and corners is significantly reduced as compared with Comparative Example No. 5 in which no heating element is installed.
No.1 to No.3 are examples of the present invention in which a protective tube is provided on the heating element, and No. 4 is a comparative example in which approximately 1/2 of the protective tube is embedded in the inner wall, and thus no protective tube is provided. Durability is remarkably improved compared to.
Further, in No. 2 and No. 3 in which the output of the heating element was changed according to the slab size, it was confirmed that the temperature difference ΔT between the slab center part and the corner part can be remarkably reduced.
１ 被加熱体
２ 内壁
３ 保護管
４ 熱伝対
５ 発熱体
1 Heated object 2 Inner wall 3 Protective tube 4 Thermocouple 5 Heating element
Claims (5)
前記発熱体を保護管内に設置することにより、該発熱体を前記誘導加熱炉の炉内雰囲気から遮断することを特徴とする誘導加熱装置。 An induction heating apparatus in which a heating element is installed in the vicinity of a corner of an object to be heated in an induction heating furnace,
An induction heating apparatus characterized in that the heating element is isolated from the furnace atmosphere of the induction heating furnace by installing the heating element in a protective tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004079616A JP4283715B2 (en) | 2004-03-19 | 2004-03-19 | Induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004079616A JP4283715B2 (en) | 2004-03-19 | 2004-03-19 | Induction heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2005265324A true JP2005265324A (en) | 2005-09-29 |
| JP4283715B2 JP4283715B2 (en) | 2009-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2004079616A Expired - Fee Related JP4283715B2 (en) | 2004-03-19 | 2004-03-19 | Induction heating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007080909A1 (en) * | 2006-01-13 | 2007-07-19 | Ngk Insulators, Ltd. | Support structure of heater |
| JP2014126312A (en) * | 2012-12-27 | 2014-07-07 | Kyocera Corp | Heater |
-
2004
- 2004-03-19 JP JP2004079616A patent/JP4283715B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007080909A1 (en) * | 2006-01-13 | 2007-07-19 | Ngk Insulators, Ltd. | Support structure of heater |
| JP5134375B2 (en) * | 2006-01-13 | 2013-01-30 | 日本碍子株式会社 | Heater support structure |
| US8411723B2 (en) | 2006-01-13 | 2013-04-02 | Ngk Insulators, Ltd. | Support structure of heater |
| JP2014126312A (en) * | 2012-12-27 | 2014-07-07 | Kyocera Corp | Heater |
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| Publication number | Publication date |
|---|---|
| JP4283715B2 (en) | 2009-06-24 |
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