JPH0459931A - Induction heating apparatus - Google Patents
Induction heating apparatusInfo
- Publication number
- JPH0459931A JPH0459931A JP2168548A JP16854890A JPH0459931A JP H0459931 A JPH0459931 A JP H0459931A JP 2168548 A JP2168548 A JP 2168548A JP 16854890 A JP16854890 A JP 16854890A JP H0459931 A JPH0459931 A JP H0459931A
- Authority
- JP
- Japan
- Prior art keywords
- induction heating
- furnaces
- hot air
- magnetic shield
- cold air
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 38
- 230000006698 induction Effects 0.000 title claims abstract description 28
- 239000011810 insulating material Substances 0.000 claims abstract description 9
- 238000007664 blowing Methods 0.000 claims description 4
- 238000009423 ventilation Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 230000004907 flux Effects 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- IDCBOTIENDVCBQ-UHFFFAOYSA-N TEPP Chemical compound CCOP(=O)(OCC)OP(=O)(OCC)OCC IDCBOTIENDVCBQ-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Furnace Details (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、連続焼鈍ラインの鋼板加熱用として使用され
る誘導加熱装置に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an induction heating device used for heating steel plates in a continuous annealing line.
〈従来の技術〉
従来の誘導加熱装置を第４図、第５図に示す。この誘導
加熱装置は、複数（例えば２個）の誘導加熱炉１ａ、ｌ
ｂを有し、この誘導加熱炉１ａ、ｌｂは、加熱用の数タ
ーンのソレノイド型コイル５ａ、５ｂが断熱材８ｍ、８
ｂのまわりに巻回され、更に誘導加熱炉１ａ。<Prior Art> A conventional induction heating device is shown in FIGS. 4 and 5. This induction heating device includes a plurality of (for example, two) induction heating furnaces 1a and 1.
The induction heating furnaces 1a, lb have several turns of solenoid coils 5a, 5b for heating, and insulation materials 8m, 8m.
b and is further wound around the induction heating furnace 1a.
１ｂの上下部分には各誘導加熱炉１ａ、ｌｂ間に誘導電
圧の低減を目的とした磁気シールド板７ｇ、７ｂ、７ｃ
、７ｄが備えられている。この磁気シールド板７ａ、７
ｂ、７ｃ。Magnetic shield plates 7g, 7b, 7c for reducing induced voltage are installed between the induction heating furnaces 1a and 1b in the upper and lower parts of 1b.
, 7d are provided. These magnetic shield plates 7a, 7
b, 7c.
７ｄは、異電源コイル間の相互詞導に伴う誘導電圧によ
り電源がトリップすることがあるのを防止するためであ
る。また、個々の磁気シールド板７ａ、７ｂ、７ｃ、７
ｄは、絶縁材（例えばゴムパツキン）を入れ電気的にオ
ープンループとなるように接続し、誘導電圧の回り込み
による高温化を防止しかつ銅配管２、Ｊｌ、２ｂ、２ｃ
、２ｄに冷却水を通すことにより温度上昇を低減してい
る。7d is for preventing the power supply from tripping due to induced voltage caused by reciprocal conduction between different power supply coils. In addition, individual magnetic shield plates 7a, 7b, 7c, 7
d is connected to an electrically open loop by inserting an insulating material (e.g. rubber gasket) to prevent high temperature due to the wraparound of induced voltage, and copper piping 2, Jl, 2b, 2c.
, 2d to reduce the temperature rise.
第４図、第５図において１６ ａ、 １６ ｂ。16a and 16b in FIGS. 4 and 5.
１６ｃ、１６ｄはサイド磁気シールド板であり、９ｂは
サポート、１０ ａ、 １０ ｂは単機容量の制約か
ら複数個（例えば２個）備えられた高周波電源、ｌｌａ
、ｌｌｂはフロアである。16c and 16d are side magnetic shield plates, 9b is a support, 10a and 10b are high-frequency power supplies that are provided in multiple pieces (for example, two pieces) due to the limitations of single machine capacity, and lla.
, llb is the floor.
〈発明が解決しようとする課題〉 誘導加熱炉１ａ、ｌｂは、高周波電源１０ａ。<Problem that the invention seeks to solve> The induction heating furnaces 1a and lb are high frequency power sources 10a.
１０ｂより高周波電流をソレノイド型コイルに供給して
鋼板６に誘導電流（渦電流）を発注させ、鋼板６を連続
的に加熱することを目的とする。しかし誘導電流は、鋼
板６だけでなく、装置を構成する磁気シールド板７ａ。The purpose is to supply a high frequency current from 10b to a solenoid type coil to cause the steel plate 6 to generate an induced current (eddy current), thereby continuously heating the steel plate 6. However, the induced current is generated not only in the steel plate 6 but also in the magnetic shield plate 7a that constitutes the device.
７ｂ、７ｃ、７ｄ、サポート９ａ、９ｂ、ソレノイド型
コイル５ａ、Ｓｂ自体等も加熱する。そのためソレノイ
ド型コイル５ａ、Ｓｂ自体：よ、中空とし、磁気シール
ド板７ａ、７ｂ。7b, 7c, 7d, supports 9a, 9b, solenoid coil 5a, Sb itself, etc. are also heated. Therefore, the solenoid type coil 5a, Sb itself is hollow, and the magnetic shield plates 7a, 7b are used.
７ｃ、７ｄは、その表面に冷却用配管２ａ。7c and 7d have cooling pipes 2a on their surfaces.
２ｂ、２ｃ、２ｄを設けそれぞれの中に冷却水を流すこ
とで温度上昇を防止している。しかしサポート類９ａ、
９ｂは嫂雑な構造をしており、冷却配管長および水量等
の問題により冷却困難である。そのため断熱材８ａ、８
ｂとシールド板７ｍ、７ｂ、７ｃ、７ｄとで区画される
中空部は、自然対流による空気冷却のみであり内部は高
温となる。そして、この内部には、ケーブル、絶縁材（
ゴムパツキン）。2b, 2c, and 2d are provided and cooling water is allowed to flow through each of them to prevent temperature rise. However, support type 9a,
9b has a complicated structure and is difficult to cool due to problems such as the length of the cooling piping and the amount of water. Therefore, the insulation materials 8a, 8
The hollow portion defined by the shield plate 7m, 7b, 7c, and 7d is cooled by air only by natural convection, and the inside becomes high temperature. Inside this, there are cables, insulation materials (
rubber pads).
冷却配管等があり、特に冷却系の一部は絶縁を目的とし
たテトロン系のホースがあるが、このホースは、高温に
なるにつれて耐圧性が低下し水漏れの原因ともなる。以
上の問題点は装置の寿命を短縮するものである。There are cooling pipes, etc., and in particular, some parts of the cooling system include Tetron hoses for the purpose of insulation, but as the temperature increases, the pressure resistance of these hoses decreases, which can cause water leaks. The above problems shorten the life of the device.
本発明は、上述の問題を解決するため、補機類の高温化
を防止するための冷却装置とエネルギロス低減のための
温風装置とを備え外部磁束もれを防止した３導加熱装置
の提供を目的とする。In order to solve the above-mentioned problems, the present invention provides a three-conductor heating device that is equipped with a cooling device to prevent the temperature of auxiliary equipment from rising and a hot air device to reduce energy loss, and which prevents external magnetic flux leakage. For the purpose of providing.
〈課題を解決するための手段〉
上述の目的を達成する本発明は、中空の断熱材に巻回さ
れたソレノイド型コイルを有する複数個の誘導加熱炉を
穐み重ねたものにおいて、この誘導加熱炉間及び加熱炉
周囲に磁気シールド板を僅え、上記断熱材と磁気シール
ド板との間に通風を行なうための冷風配管を備え、上記
誘導加熱炉の最下部にバスラインに熱風を通すための温
風吹き出し装置を備えた、ことを特徴とする。<Means for Solving the Problems> The present invention, which achieves the above-mentioned object, provides a method for induction heating in a stack of a plurality of induction heating furnaces each having a solenoid coil wound around a hollow heat insulating material. A magnetic shield plate is installed between the furnaces and around the heating furnace, and cold air piping is provided for ventilation between the above-mentioned heat insulating material and the magnetic shield plate, and hot air is passed through the bus line at the bottom of the above-mentioned induction heating furnace. It is characterized by being equipped with a warm air blowing device.
く作 用〉
強制冷却装置を備えることにより団えっ材と磁気シール
ド板間の中空部に加熱炉側面より強制的に冷却を流し込
むことで装置内部の温度上昇を低減し、また、加熱した
鋼板の自然放冷および強制冷却することによる放熱を防
止するため加熱炉の最下部に温風装置を設はエネルギー
ロスを低減するものである。Equipped with a forced cooling device, cooling is forced into the hollow space between the aggregate material and the magnetic shield plate from the side of the heating furnace, reducing the temperature rise inside the device, and also reducing the temperature rise of the heated steel plate. In order to prevent heat radiation due to natural cooling and forced cooling, a hot air device is installed at the bottom of the heating furnace to reduce energy loss.
く実 施 例〉
ここで、第１図ないし第３図を参照して本発明の詳細な
説明する。なお、第４図、第５図と同一部分には同符号
を付す。第１図、第２図において、加熱炉１ａ、Ｉｂに
あって、鋼板６が通る中空の断熱材８ａ、８ｂには、そ
れぞれソレノイド型コイル５ａ、５ｂが巻回され、この
上下に配置された誘導加熱炉１哀。EMBODIMENTS> The present invention will now be described in detail with reference to FIGS. 1 to 3. Note that the same parts as in FIGS. 4 and 5 are given the same reference numerals. In FIGS. 1 and 2, in the heating furnaces 1a and Ib, solenoid-type coils 5a and 5b are wound around hollow heat insulating materials 8a and 8b, through which the steel plate 6 passes, respectively, and are arranged above and below. Induction heating furnace 1.
１ｂ間の相互誘導作用（相互干渉）の低減を目的として
磁気シールド板７ａ、７ｂ、７ｃ。Magnetic shield plates 7a, 7b, 7c for the purpose of reducing mutual induction (mutual interference) between 1b.
７ｄが備えられ、サポート９０が配置されている。磁気
シールド板７ａ７ｂには冷却用として冷却配管２ａ、２
ｂ、２ｃが設けられている。磁気シールド板７ａ、７ｂ
、７ｃ、７ｄの間にあってコイル５ａ、５ｂを覆うよう
にサイド磁気シールド板１６ａ、１６ｂ、１．６ｃ。7d and a support 90 is arranged. The magnetic shield plate 7a7b has cooling pipes 2a, 2 for cooling.
b, 2c are provided. Magnetic shield plates 7a, 7b
, 7c, 7d, and side magnetic shield plates 16a, 16b, 1.6c so as to cover the coils 5a, 5b.
１６ｄが配置されている。16d is arranged.
また、誘導加熱炉〕ａ、１ｂの側面から：、ｆ１冷風配
管３ａ、３ｂが誘導加熱炉１ａ、Ｉｂ内に強制的に吹き
込むように構成され、第１図、第３図に示すように、冷
風配ＩＷ；３ａ、３ｂは号イド磁気シールド板１６ｃ、
１６ｄに連通され取付けられている。そして、冷風配管
３ａ、３ｂは配管３を介して冷風機に連通され、冷風が
誘導加熱炉１ａ、Ｉｂ内に強制的に吹き込むようになっ
ている。In addition, from the side of the induction heating furnaces a and 1b, the f1 cold air pipes 3a and 3b are configured to forcefully blow into the induction heating furnaces 1a and Ib, as shown in FIGS. 1 and 3. Cold air distribution IW; 3a and 3b are numbered magnetic shielding plates 16c,
It is connected to and attached to 16d. The cold air pipes 3a, 3b are connected to a cooling air fan via the pipe 3, so that the cold air is forcibly blown into the induction heating furnaces 1a, Ib.
一方、誘導加熱炉１ａ、ｌｂの最下部には、温風吹き出
し装置１２ｇ、１２ｂが備えられ、温風機につながった
温風配管４により熱風を鋼板６のバスライン内に流すこ
とで温度低下を防止している。On the other hand, hot air blowing devices 12g and 12b are provided at the bottom of the induction heating furnaces 1a and 1b, and hot air is flowed into the bus line of the steel plate 6 through a hot air pipe 4 connected to a hot air fan, thereby reducing the temperature. It is prevented.
鋼板６の加熱に当って、誘導加熱炉１ａ。In heating the steel plate 6, an induction heating furnace 1a is used.
１ｂは、高周波電源１０より高周波電流をソレノイド型
コイル５ａ、５ｂに供給することにより鋼板６に誘導電
流（渦電流）を発生させ、鋼板６を連続的に加熱する装
置である。1b is a device that continuously heats the steel plate 6 by generating an induced current (eddy current) in the steel plate 6 by supplying a high frequency current from the high frequency power supply 10 to the solenoid type coils 5a, 5b.
この場合、鋼板６のみならず装置を構成する様々類も加
熱されるが冷却配管２ａ、２ｂ。In this case, not only the steel plate 6 but also various components of the device are heated, including the cooling pipes 2a and 2b.
２ｃ、２ｄに冷却水を流すことで高温化を防止し、更に
冷風配管３ａ、３ｂより冷風を誘導加熱炉１ａ、ｌｂ内
に吹き込むことにより、内部の湿度上昇を低減し内部補
機類の破損を防止する。。By flowing cooling water through pipes 2c and 2d, high temperatures are prevented, and by blowing cold air into induction heating furnaces 1a and 1b from cold air pipes 3a and 3b, increases in internal humidity are reduced and damage to internal auxiliary equipment is prevented. prevent. .
第３図は磁気シー）Ｌド板の接続状態を示す。FIG. 3 shows the connection state of the magnetic shield plate.
第３図に示すように、■方向の接続（よ絶縁材（ゴムパ
ツキン）１４ａ、１４ｂ、１４ｃ。As shown in FIG. 3, connections in direction (1) (insulating materials (rubber gaskets) 14a, 14b, 14c).
１４ｄを入れ電気的にオーブンループとし誘導電流の回
り込みによる発熱を低減し、Ｈ方向の一部は銅パツキン
１３ａ、１３ｂ、１３ｃで接続し閉ループとすることで
外部への磁束漏れが低減でき、周辺金属の加熱がこの磁
気シールド板の接続方法により防止できる。第３図（ｂ
） （ｃ）において、１５は接続用ボルト、１１ａ、ｌ
ｌｂは銅製座金、１８ ｇ、 １８ ｂは絶縁用座金で
ある。14d is inserted to create an electrical oven loop to reduce heat generation due to the wraparound of induced current, and a part of the H direction is connected with copper gaskets 13a, 13b, and 13c to form a closed loop, which reduces magnetic flux leakage to the outside and Heating of metal can be prevented by this method of connecting magnetic shield plates. Figure 3 (b
) In (c), 15 is a connecting bolt, 11a, l
lb is a copper washer, 18 g and 18 b are insulating washers.
〈発明の効果〉
思上説明したように本発明によえば、ソレノイド型コイ
ルを巻き付けた断熱材とそれを囲む磁気シールド板間の
空間部分を強制冷却することにより、その内部が高温状
態とならずに内部に装備した補ｌ１ｌｉ類の破損が防止
でき、しかも磁気シールド板の接続状態により誘導電流
回り込みによる磁気シールド板の発熱及び磁気シールド
板の接続部からの磁束漏れによる外部サポートやフロア
等の周辺金属の加熱を低減し、更に、温風吹き出し装置
を設けて熱風を鋼板のバスライン内に流すことにより放
熱によるエネルギーワスの低減が可能となった。<Effects of the Invention> As explained above, according to the present invention, by forcibly cooling the space between the heat insulating material around which the solenoid coil is wound and the magnetic shield plate surrounding it, it is possible to prevent the inside from becoming high temperature. It can prevent damage to the internal components without damaging the external supports, floors, etc. due to heat generation of the magnetic shield plate due to induced current wraparound and leakage of magnetic flux from the connection part of the magnetic shield plate due to the connection state of the magnetic shield plate. By reducing the heating of surrounding metals and by installing a hot air blower to flow hot air into the steel plate bus line, it has become possible to reduce energy waste due to heat radiation.
第１図ないし第３図は本発明の実施例を示し、第１図は
一部切欠いた斜視図、第２図は内部斜視図、第３図（ａ
）ば磁気シールド板組立構成図、第３ｒＭ（ｂｌはＨ方
向拡大図、第３図（Ｃ１ば防向拡大図、第４図は従来例
の斜視図、第５図は断面図である。
図 中、
１ａ、ｌｂは誘導加熱炉、
２ａ、２ｂ、２ｃ、２ｄは冷却配管、
３ａ、３ｂは冷風配管、
４ａ、４ｂは温風配管、
５ａ、５ｂはソレノイド型コイル、
７ａ、７ｂ、７ｃ、７ｄは磁気シールド板、８ａ、８ｂ
は断熱材、
１０ｇ、１０ｂは高周波電源
１３ａ、１３ｂ、１３ｃは銅パツキン、１４ａ、１４ｂ
、１４ｃ、１４ｄは絶縁物、１６ ａ、 １６ ｂ、
１６ ｃ、 １６ ｄはサイド磁気シールド板で
ある。1 to 3 show embodiments of the present invention, in which FIG. 1 is a partially cutaway perspective view, FIG. 2 is an internal perspective view, and FIG.
) is an assembled configuration diagram of a magnetic shield plate, 3rd rM (bl is an enlarged view in the H direction, FIG. 3 is an enlarged view of the shielding direction, FIG. 4 is a perspective view of a conventional example, and FIG. 5 is a sectional view. Inside, 1a, lb are induction heating furnaces, 2a, 2b, 2c, 2d are cooling pipes, 3a, 3b are cold air pipes, 4a, 4b are hot air pipes, 5a, 5b are solenoid type coils, 7a, 7b, 7c, 7d is a magnetic shield plate, 8a, 8b
10g, 10b are high frequency power supplies 13a, 13b, 13c are copper gaskets, 14a, 14b
, 14c, 14d are insulators, 16 a, 16 b,
16 c and 16 d are side magnetic shield plates.
Claims (1)
複数個の誘導加熱炉を精み重ねたものにおいて、 この誘導加熱炉間及び加熱炉周囲に磁気シールド板を備
え、 上記断熱材と磁気シールド板との間に通風を行なうため
の冷風配管を備え、 上記誘導加熱炉の最下部にバスラインに熱風を通すため
の温風吹き出し装置を備えた、 ことを特徴とする誘導加熱装置。[Claims] A sophisticated stack of multiple induction heating furnaces each having a solenoid coil wound around a hollow heat insulating material, comprising a magnetic shield plate between and around the induction heating furnaces, A cold air pipe is provided for ventilation between the heat insulating material and the magnetic shield plate, and a hot air blowing device is provided at the lowest part of the induction heating furnace for passing hot air to the bus line. Induction heating device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2168548A JP2755798B2 (en) | 1990-06-28 | 1990-06-28 | Induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2168548A JP2755798B2 (en) | 1990-06-28 | 1990-06-28 | Induction heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0459931A true JPH0459931A (en) | 1992-02-26 |
| JP2755798B2 JP2755798B2 (en) | 1998-05-25 |
Family
ID=15870064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2168548A Expired - Lifetime JP2755798B2 (en) | 1990-06-28 | 1990-06-28 | Induction heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2755798B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007335640A (en) * | 2006-06-15 | 2007-12-27 | Matsushita Electric Ind Co Ltd | Method of attaching electronic component onto printed wiring board |
| JP2008066411A (en) * | 2006-09-05 | 2008-03-21 | Denso Corp | Electronic component mounting structure |
-
1990
- 1990-06-28 JP JP2168548A patent/JP2755798B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007335640A (en) * | 2006-06-15 | 2007-12-27 | Matsushita Electric Ind Co Ltd | Method of attaching electronic component onto printed wiring board |
| JP2008066411A (en) * | 2006-09-05 | 2008-03-21 | Denso Corp | Electronic component mounting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2755798B2 (en) | 1998-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5895599A (en) | Induction heating device and continuous treatment installation including same | |
| KR102163167B1 (en) | Heating System using Waste Heat | |
| CN203966735U (en) | A kind of novel transformer | |
| US2635168A (en) | Eddy current heater | |
| JP4833906B2 (en) | Induction heating equipment | |
| JPH0459931A (en) | Induction heating apparatus | |
| CN107326152B (en) | A kind of magnetic heat treatment furnace that performance is stablized | |
| KR0142908B1 (en) | Protecting device for induction poles and inductor provided with this device | |
| US4247736A (en) | Induction heater having a cryoresistive induction coil | |
| WO2023068743A1 (en) | Induction heating-type fan heater | |
| JP2009144977A (en) | Electromagnetic induction heating type water heater | |
| JP4842946B2 (en) | Method and apparatus for a water-cooled power module in an inductive calendering control actuator system | |
| KR20100084295A (en) | Electic hot blast heater using high frequency induction heating | |
| US4520487A (en) | High temperature electric furnace with metallic resistances in the form of hollow vertical heating tubes | |
| KR20200075662A (en) | Induction Heating Apparatus | |
| CN214064865U (en) | Steam generating equipment | |
| JPH04354312A (en) | Gas insulation transformer | |
| US20220167470A1 (en) | Electric range | |
| US1859419A (en) | Electric induction furnace | |
| RU2196279C1 (en) | Gas heating device | |
| JP2670336B2 (en) | Gas insulated transformer | |
| JPS5926728Y2 (en) | closed switchboard | |
| JPH10116737A (en) | Gas insulated transformer | |
| RU2237386C2 (en) | Automatic coupler shank heating unit | |
| US857122A (en) | Electric heater. |