JP3985075B2 - High frequency induction heating device - Google Patents
High frequency induction heating device Download PDFInfo
- Publication number
- JP3985075B2 JP3985075B2 JP2002185400A JP2002185400A JP3985075B2 JP 3985075 B2 JP3985075 B2 JP 3985075B2 JP 2002185400 A JP2002185400 A JP 2002185400A JP 2002185400 A JP2002185400 A JP 2002185400A JP 3985075 B2 JP3985075 B2 JP 3985075B2
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- JP
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- Prior art keywords
- coil
- induction heating
- frequency induction
- high frequency
- inverter circuit
- 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.)
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Description
【０００１】
【産業上の利用分野】
本発明は、ワークコイルへの高周波電流の供給によってワークを誘導加熱する高周波誘導加熱装置に関する。
【０００２】
【従来の技術】
従来、この種の高周波誘導加熱装置においては、トランジスタ式のインバータ回路の出力側にカレントトランスの一次側が接続されており、このカレントトランスの二次側に誘導加熱すべきワークの形状に対応したワークコイルが接続されている。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような高周波誘導加熱装置にあっては、カレントトランスの二次側に単にワークコイルが接続されているのみであるため、例えば誘導加熱時にワークコイルが何らかの原因で破壊されて開放状態となった場合等に、無負荷状態となってカレントトランスやインバータ回路に異常電流等が流れてこれらを破壊する虞がある。
【０００４】
そのため、カレントトランスの二次側の電流を常時検知して、異常時にインバータ回路の作動を停止させる等の制御的に対応する方法が考えられているが、これらの場合、部品点数が増加してコスト高になると共に、瞬間的な大電流を即座に検知してインバータ回路を保護することが現実的に難しく、装置の破壊を確実に防止することが難しいという問題点を有している。
【０００５】
本発明は、このような事情に鑑みてなされたもので、その目的は、簡易な構成によりワークコイルの開放等による異常発生時に装置の破壊を確実に防止し得る高周波誘導加熱装置を提供することにある。
【０００６】
【課題を解決するための手段】
かかる目的を達成すべく、本発明のうち請求項１に記載の発明は、所定周波数の高周波電流を発生するトランジスタ式のインバータ回路と、該インバータ回路の出力側に接続された共振回路と、該共振回路の出力側にその一次側が接続されると共にその二次側の絶縁板で挟持された一対の銅板からなるホルダーにワークコイルが接続されたカレントトランスと、を備えた高周波誘導加熱装置において、前記ホルダーの銅板にワークコイルと並列に保護コイルが接続されると共に、該保護コイルに前記銅板の外周面に固定された冷却パイプから冷却水が循環供給されることを特徴とする。
【０００７】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて詳細に説明する。
図１〜図４は、本発明に係わる高周波誘導加熱の一実施例を示している。図において、高周波誘導加熱装置１は、筐体２の内部には、図示しないトランジスタ式のインバータ回路と、このインバータ回路の出力側に接続された出力トランスや共振コンデンサ等からなる共振回路と、この共振回路の出力側にその一次側が接続されたカレントトランス等が内蔵されている。
【０００８】
また、カレントトランスの出力側には、ワークコイル３が接続されている。このワークコイル３は、カレントトランスの出力側に、絶縁板で挟持された一対の銅板４ａ、４ｂからなり前記筐体２の前面に突出したホルダー４の先端部に連結固定されている。そして、このホルダー４の銅板４ａ、４ｂ間で筐体２側の上面には、保護コイル５が接続されており、これにより、カレントトランスの出力側にワークコイル３と保護コイル５とが並列接続されていることになる。
【０００９】
なお、ホルダー４の各銅板４ａ、４ｂの外面には、通電時の該ホルダー４の発熱を防止するための冷却パイプ６がそれぞれロウ付け固定されており、この冷却パイプ６を介してワークコイル３や保護コイル５に冷却水が循環供給されるようになっている。
【００１０】
この高周波誘導加熱装置において、例えば円筒状のワークを出力が２００キロワットの高周波電流で誘導加熱する場合、ワークコイル３のインピーダンスを０．０２５マイクロヘンリーに設定し、保護コイル５のインピーダンスを０．２７マイクロヘンリーに設定すれば、ワークコイル３が開放した場合であっても、前記インバータ回路等が破壊されないことが確認されている。
【００１１】
つまり、ワークコイル３に対して保護コイル５を並列的に配置することにより、例えば長期の使用によるワークコイル３を形成する銅パイプが切断したり、あるいはワークコイル３がホルダー４に確実に固定されず、ワークコイル３が開放状態となった場合等に、保護コイル５がカレントトランスの二次側に接続される状態となって、インバータ回路やカレントトランス等が保護されて、これらの破壊が防止されることになる。
【００１２】
その結果、インバータ回路の高価なＳＩＴやＦＥＴ、ＩＧＢＴ等のトランジスタを交換する必要がなくなり、高周波誘導加熱装置１のメンテナンスを容易かつ安価に行うことができて、該装置１を長期に亘り安定して使用することが可能になる。
【００１３】
なお、以上の例における、ワークコイル３と保護コイル５のインピーダンスは一例であって、ワークの形状、周波数やワット数等の出力状態、ワークコイル３の形状等に応じて適宜に変更することができる。
【００１４】
【発明の効果】
以上詳述したように、請求項１に記載の発明によれば、カレントトランスの二次側に接続されるワークコイルに保護コイルが並列接続されると共に保護コイルに冷却水が循環供給されるため、この保護コイルでワークコイルが開放状態となった場合等に、例えば異常電流がカレントトランスやインバータ回路に流れるのを防止でき、その結果、ワークコイル開放時等の保護コイルに流れる電流値を検知することでインバータ回路を瞬時に遮断できる等、簡易な構成で装置破壊を確実に防止することができて、長期に亘り安定した誘導加熱状態を得ることが可能になる。
【図面の簡単な説明】
【図１】本発明に係わる高周波誘導加熱装置の一実施例を示す斜視図
【図２】同その要部の側面図
【図３】同その正面図
【図４】同その平面図
【符号の説明】
１ 高周波誘導加熱装置
２ 筐体
３ ワークコイル
４ ホルダー
４ａ、４ｂ 銅板
５ 保護コイル[0001]
[Industrial application fields]
The present invention relates to a high frequency induction heating apparatus that induction heats a workpiece by supplying a high frequency current to a work coil.
[0002]
[Prior art]
Conventionally, in this type of high-frequency induction heating apparatus, the primary side of a current transformer is connected to the output side of a transistor-type inverter circuit, and the work corresponding to the shape of the work to be induction-heated is connected to the secondary side of the current transformer. The coil is connected.
[0003]
[Problems to be solved by the invention]
However, in such a high-frequency induction heating apparatus, since the work coil is simply connected to the secondary side of the current transformer, for example, the work coil is broken for some reason during induction heating and is in an open state. In such a case, there is a possibility that an abnormal current or the like flows through the current transformer or the inverter circuit due to a no-load state and destroys them.
[0004]
For this reason, a method of controlling the secondary current of the current transformer at all times by detecting it constantly and stopping the operation of the inverter circuit at the time of abnormality is considered, but in these cases, the number of parts increases. In addition to increasing the cost, it is practically difficult to detect an instantaneous large current immediately to protect the inverter circuit, and it is difficult to reliably prevent the destruction of the device.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a high-frequency induction heating apparatus that can reliably prevent destruction of the apparatus when an abnormality occurs due to opening of a work coil or the like with a simple configuration. There is.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the invention according to claim 1 of the present invention includes a transistor type inverter circuit that generates a high-frequency current of a predetermined frequency, a resonance circuit connected to an output side of the inverter circuit , In a high-frequency induction heating apparatus comprising a current transformer having a work coil connected to a holder made of a pair of copper plates sandwiched between insulating plates on the secondary side and connected to the output side of the resonance circuit, A protective coil is connected to the copper plate of the holder in parallel with the work coil, and cooling water is circulated and supplied to the protective coil from a cooling pipe fixed to the outer peripheral surface of the copper plate.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 4 show an embodiment of high frequency induction heating according to the present invention. In the figure, a high-frequency induction heating apparatus 1 includes a transistor-type inverter circuit (not shown), a resonance circuit including an output transformer and a resonance capacitor connected to the output side of the inverter circuit, A current transformer having a primary side connected to the output side of the resonance circuit is incorporated.
[0008]
A
[0009]
A
[0010]
In this high frequency induction heating apparatus, for example, when a cylindrical workpiece is induction heated with a high frequency current having an output of 200 kilowatts, the impedance of the
[0011]
That is, by arranging the
[0012]
As a result, it is no longer necessary to replace expensive transistors such as SIT, FET, and IGBT in the inverter circuit, and the high-frequency induction heating device 1 can be easily and inexpensively maintained. Can be used.
[0013]
Note that the impedances of the
[0014]
【The invention's effect】
As described above in detail, according to the first aspect of the present invention, the protective coil is connected in parallel to the work coil connected to the secondary side of the current transformer, and the cooling water is circulated and supplied to the protective coil. When the work coil is opened by this protective coil, for example, abnormal current can be prevented from flowing to the current transformer or inverter circuit, and as a result, the current value flowing through the protective coil when the work coil is open is detected. By doing so, it is possible to reliably prevent the destruction of the apparatus with a simple configuration, such as instantaneously shutting off the inverter circuit, and to obtain a stable induction heating state over a long period of time.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a high-frequency induction heating apparatus according to the present invention. FIG. 2 is a side view of the main part thereof. FIG. 3 is a front view thereof. Explanation】
DESCRIPTION OF SYMBOLS 1 High frequency induction heating apparatus 2
Claims (1)
前記ホルダーの銅板にワークコイルと並列に保護コイルが接続されると共に、該保護コイルに前記銅板の外周面に固定された冷却パイプから冷却水が循環供給されることを特徴とする高周波誘導加熱装置。 Transistor-type inverter circuit for generating a high-frequency current of a predetermined frequency, a resonance circuit connected to the output side of the inverter circuit, and a primary side connected to the output side of the resonance circuit and an insulating plate on the secondary side In a high frequency induction heating apparatus comprising a current transformer having a work coil connected to a holder made of a pair of copper plates sandwiched between
A high frequency induction heating apparatus , wherein a protective coil is connected to the copper plate of the holder in parallel with the work coil, and cooling water is circulated and supplied to the protective coil from a cooling pipe fixed to the outer peripheral surface of the copper plate. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002185400A JP3985075B2 (en) | 2002-06-26 | 2002-06-26 | High frequency induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002185400A JP3985075B2 (en) | 2002-06-26 | 2002-06-26 | High frequency induction heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004031105A JP2004031105A (en) | 2004-01-29 |
| JP3985075B2 true JP3985075B2 (en) | 2007-10-03 |
Family
ID=31181040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002185400A Expired - Lifetime JP3985075B2 (en) | 2002-06-26 | 2002-06-26 | High frequency induction heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3985075B2 (en) |
-
2002
- 2002-06-26 JP JP2002185400A patent/JP3985075B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004031105A (en) | 2004-01-29 |
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