JP2550505B2 - Induction heating device - Google Patents

Induction heating device

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Publication number
JP2550505B2
JP2550505B2 JP2206256A JP20625690A JP2550505B2 JP 2550505 B2 JP2550505 B2 JP 2550505B2 JP 2206256 A JP2206256 A JP 2206256A JP 20625690 A JP20625690 A JP 20625690A JP 2550505 B2 JP2550505 B2 JP 2550505B2
Authority
JP
Japan
Prior art keywords
temperature side
low temperature
coil
power source
fixed contact
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 - Lifetime
Application number
JP2206256A
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Japanese (ja)
Other versions
JPH0495385A (en
Inventor
正武 目次
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2206256A priority Critical patent/JP2550505B2/en
Publication of JPH0495385A publication Critical patent/JPH0495385A/en
Application granted granted Critical
Publication of JP2550505B2 publication Critical patent/JP2550505B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明は鍛造業界等で使用される誘導加熱装置に係
り、特に複数の加熱コイル等の接続を切換える技術に関
するものである。
Description: TECHNICAL FIELD The present invention relates to an induction heating device used in the forging industry and the like, and more particularly to a technique for switching connection of a plurality of heating coils and the like.

〔従来の技術〕[Conventional technology]

第4図は例えば実開昭57−117096号公報に開示された
従来の加熱コイル接続装置を使用した誘導加熱装置の概
略構成を示す回路図である。図において、(1)はトラ
ンジスインバータ等を使用した高周波電源で、その出力
周波数は、周波数によって決定される表皮効果による電
流集中度が加熱効率と被加熱材の温度分布に影響するこ
とからこれらの特性が最適となる所定の周波数に設定さ
れる。(2)は矢印(3)の方向に搬送される被加熱材
を誘導加熱する加熱コイルで、低温側コイル(2A)と高
温側コイル(2B)とで構成されている。(4)は加熱コ
イル(2)と並列に接続されるコンデンサで、加熱コイ
ル(2)と同様、低温側コンデンサ(4A)と高温側コン
デンサ(4B)とからなる。
FIG. 4 is a circuit diagram showing a schematic configuration of an induction heating device using a conventional heating coil connecting device disclosed in, for example, Japanese Utility Model Laid-Open No. 57-117096. In the figure, (1) is a high-frequency power source using a transistor inverter, etc., and its output frequency depends on the current concentration due to the skin effect, which is determined by the frequency, since it affects the heating efficiency and the temperature distribution of the heated material. It is set to a predetermined frequency with which the characteristics are optimal. (2) is a heating coil for inductively heating the material to be heated conveyed in the direction of arrow (3), which is composed of a low temperature side coil (2A) and a high temperature side coil (2B). (4) is a capacitor connected in parallel with the heating coil (2), and like the heating coil (2), includes a low temperature side capacitor (4A) and a high temperature side capacitor (4B).

なお、各コンデンサは図に示すように、複数のユニッ
トコンデンサを必要数並列に接続して構成されている。
そして、低温側コイル(2A)と低温側コンデンサ(4A)
とが一対1組となり、前者のインダクタンスと後者のキ
ャパシタンスとは高周波電源(1)の出力周波数におい
て共振するようにその値が設定されている。高温側コイ
ル(2B)および高温側コンデンサ(4B)の対についても
同様である。(5)は低温側コイル(2A)の高周波電源
(1)への接続、切離しを行う開閉器、(6)は低温側
コンデンサ(4A)の高周波電源(1)への接続、切離し
を行うコンタクタである。そして、低温側コンデンサ
(4A)、高温側コンデンサ(4B)およびコンタクタ
(6)はまとめてコンデンサ盤(7)に収容されてい
る。
As shown in the figure, each capacitor is configured by connecting a required number of unit capacitors in parallel.
And low temperature side coil (2A) and low temperature side capacitor (4A)
And 1 are one pair, and the values of the former inductance and the latter capacitance are set so as to resonate at the output frequency of the high frequency power supply (1). The same applies to the pair of high temperature side coil (2B) and high temperature side capacitor (4B). (5) is a switch for connecting and disconnecting the low temperature side coil (2A) to the high frequency power supply (1), and (6) is a contactor for connecting and disconnecting the low temperature side capacitor (4A) to the high frequency power supply (1). Is. The low temperature side condenser (4A), the high temperature side condenser (4B) and the contactor (6) are collectively housed in the condenser board (7).

次に動作について説明する。先ず、被加熱材の加熱処
理量(例えば単位時間当りに処理する被加熱材の個数や
重量で表わされる)が予め設定された所定の下限値以上
の場合には、開閉器(5)およびコンタクタ(6)を共
に閉の状態、即ち、全コイル(2A)(2B)および全コン
デンサ(4A)(4B)を高周波電源(1)に接続した状態
で加熱を行う。被加熱材は低温側コイル(2A)→高温側
コイル(2B)の順にその内部を通過していく過程で電磁
誘導による渦電流損が発生して鍛造に適した1250℃程度
の温度に昇温される。
Next, the operation will be described. First, when the heat treatment amount of the material to be heated (represented, for example, by the number or weight of the material to be heated per unit time) is equal to or more than a preset lower limit value, the switch (5) and the contactor Heating is performed with both (6) closed, that is, with all coils (2A) (2B) and all capacitors (4A) (4B) connected to the high frequency power supply (1). The material to be heated rises to a temperature of about 1250 ° C suitable for forging due to eddy current loss due to electromagnetic induction in the process of passing through the inside in the order of low temperature side coil (2A) → high temperature side coil (2B). To be done.

そして、被加熱材が所定の処理速度で加熱コイル
(2)内を進行していった場合、その進行距離につれて
温度が上昇するとともにその周辺部と中心部との温度差
も少なくなっていくよう加熱コイル(2)の長さや電力
分布が設定されている。
When the material to be heated progresses in the heating coil (2) at a predetermined processing speed, the temperature rises as the distance travels and the temperature difference between the peripheral portion and the central portion also decreases. The length and power distribution of the heating coil (2) are set.

ところで、鍛造用成形機において、その成形型を変更
した直後で試打ちと称して被加熱材を数個鍛造しその成
形状態での寸法検査をするような場合がある。この場
合、被加熱材の処理速度が遅くなるため加熱コイル
(2)内位置と温度推移の関係が変化し出口側で1250℃
とすると中間で1300℃等の高温部分が発生し、被加熱材
の溶着等の不具合が発生する。
By the way, in a forging machine, there are cases in which a plurality of materials to be heated are forged and a dimensional inspection is performed in the formed state, which is called trial punching, immediately after changing the forming die. In this case, since the processing speed of the material to be heated becomes slow, the relationship between the position inside the heating coil (2) and the temperature change changes, and 1250 ° C at the outlet side.
If so, a high temperature portion such as 1300 ° C. is generated in the middle, and problems such as welding of the material to be heated occur.

この不具合を解決するため、加熱コイル(2)を2個
に分割し、加熱処理量が定格稼動時の約70%程度以下に
なると開閉器(5)を開放して高温側コイル(2B)のみ
で加熱を行う。この場合、コンデンサ(4)の接続をそ
のままにしておくと加熱コイルのインダクタンスとで決
まる共振周波数がずれるため開閉器(5)の開放と同時
にコンタクタ(6)も開放して低温側コンデンサ(4A)
を回路から切離す訳である。
In order to solve this problem, the heating coil (2) is divided into two, and when the heat treatment amount is about 70% or less of the rated operation, the switch (5) is opened and only the high temperature side coil (2B) is opened. To heat. In this case, if the connection of the capacitor (4) is left as it is, the resonance frequency determined by the inductance of the heating coil shifts, so the contactor (6) is opened at the same time when the switch (5) is opened, and the low temperature side capacitor (4A)
Is to disconnect from the circuit.

なお、低温側コイル(2A)と低温側コンデンサ(4A)
とは永久接続とし、両者一体で高周波電源(1)と入切
する回路構成とすれば開閉切(5)とコンタクト(6)
とが共用できて回路が簡単となるが、この場合、低温側
コイル(2A)と低温側コンデンサ(4A)とは共振関係に
あるので、切離して高温側コイル(2B)のみで加熱する
場合、被加熱材が磁気鉄芯の役割をして低温側コイル
(2A)に相互誘導による電圧が誘起し、直列共振現象で
低温側コイル(2A)および低温側コンデンサ(4A)に高
電圧が発生する可能性があり絶縁設計上また作業取扱い
上好ましくない。
The low temperature side coil (2A) and the low temperature side capacitor (4A)
Is a permanent connection, and if the circuit configuration is such that both are integrated with the high-frequency power supply (1), the switching (5) and contact (6)
, And the circuit becomes simple, but in this case, since the low temperature side coil (2A) and the low temperature side capacitor (4A) have a resonance relationship, when disconnecting and heating with only the high temperature side coil (2B), The material to be heated plays the role of a magnetic iron core and a voltage due to mutual induction is induced in the low temperature side coil (2A), and a high voltage is generated in the low temperature side coil (2A) and low temperature side capacitor (4A) due to the series resonance phenomenon. There is a possibility that it is not preferable in terms of insulation design and work handling.

〔発明が解決しようとする課題〕[Problems to be Solved by the Invention]

加熱処理量に応じて加熱コイル等の接続を切換える従
来の誘導加熱装置は以上のように構成されているので、
加熱コイルの切離しと共にコンデンサの切離しが必要と
なる。このため、開閉器(5)に加えてコンタクタ
(6)を設置する必要があり、その分コンデンサ盤
(7)の寸法が増大するという問題点があった。
Since the conventional induction heating device that switches the connection of the heating coil etc. according to the heat treatment amount is configured as described above,
It is necessary to separate the condenser along with the separation of the heating coil. Therefore, it is necessary to install the contactor (6) in addition to the switch (5), and there is a problem that the size of the capacitor panel (7) is increased accordingly.

また、開閉器(5)またはコンタクタ(6)の動作不
良により、低温側コイル(2A)及び低温側コンデンサ
(4A)のいずれか一方が切り離されなかった場合は、加
熱コイルとコンデンサとで決まる共振周波数がずれるた
め、加熱処理が正常に行われなくなるという問題点があ
った。
Also, if either the low temperature side coil (2A) or the low temperature side capacitor (4A) is not disconnected due to malfunction of the switch (5) or the contactor (6), the resonance determined by the heating coil and the capacitor Since the frequency shifts, there is a problem that the heat treatment cannot be performed normally.

この発明は以上のような問題点を解消するためになさ
れたもので、加熱コイル切り離し用開閉器とコンデンサ
切り離し用コンタクタを一体化することにより、コンデ
ンサ切り離し専用のコンタクタをなくして装置寸法の低
減を図ると共に、電源に対する加熱コイルとコンデンサ
との切り離し時の動作不良を防止して加熱処理の信頼性
を向上するものである。
The present invention has been made to solve the above problems, and by integrating a heating coil disconnecting switch and a capacitor disconnecting contactor, a contactor dedicated to disconnecting the capacitor is eliminated to reduce the device size. At the same time, the operation failure is prevented when the heating coil and the capacitor are disconnected from the power source, and the reliability of the heating process is improved.

〔課題を解決するための手段〕[Means for solving the problem]

この発明に係る誘導加熱装置は、電源と、この電源を
共有して並列に接続され被加熱材を誘導加熱する低温側
コイルおよび高温側コイルと、この各コイルと並列に接
続され上記各コイルと対となり上記電源の出力周波数に
おいて上記各コイルのインダクタンウに共振するキャパ
シタンスを有する低温側コンデンサおよび高温側コンデ
ンサと、上記被加熱材を上記低温側コイルから上記高温
側コイルへ通過させて誘導加熱する際、上記被加熱材の
加熱処理量に応じて、上記電源の一端と接続された上記
低温側コイルの一端および上記電源の一端と接続された
上記低温側コンデンサの一端を電気的に接離する開閉手
段とを備えた誘導加熱装置において、上記開閉手段は、
上記低温側コイルの一端に接続された第1の固定接点
と、この第1の固定接点と所定間隔をあけて配置され上
記低温側コンデンサの一端に接続された第2固定接点
と、上記両固定接点と所定間隔をあけて配置され上記電
源の一端に接続された第3の固定接点と、上記各固定接
点と接離可能な1つの可動接点とから構成したものであ
る。
The induction heating device according to the present invention includes a power source, a low temperature side coil and a high temperature side coil that are connected in parallel by sharing the power source and induction-heat a material to be heated, and the above coils connected in parallel with the respective coils A low temperature side capacitor and a high temperature side capacitor having a capacitance that resonates with the inductor of each coil at the output frequency of the power source, and the above-mentioned material to be heated are passed from the low temperature side coil to the high temperature side coil for induction heating. At this time, one end of the low-temperature side coil connected to one end of the power source and one end of the low-temperature side capacitor connected to one end of the power source are electrically connected to and separated from each other according to the heat treatment amount of the material to be heated. In an induction heating device comprising an opening / closing means, the opening / closing means is
A first fixed contact connected to one end of the low temperature side coil, a second fixed contact arranged at a predetermined distance from the first fixed contact and connected to one end of the low temperature side capacitor, and the both fixed The third fixed contact is arranged at a predetermined distance from the contact and is connected to one end of the power source, and one movable contact that can be contacted with and separated from each of the fixed contacts.

〔作用〕[Action]

この発明に係る上記開閉器の各固定接点に接続された
加熱コイルおよびコンデンサの各他端をそれぞれ電源の
他端に接続しておく。この状態で上記開閉器を閉とする
とその加熱コイルおよびコンデンサが同時に並列となっ
て電源に接続される。また、上記開閉器を開として各固
定接点から可動接点を離反させると、加熱コイルおよび
コンデンサは同時に電源から切離され、しかもそれら相
互間も分離されることになる。
The other end of each of the heating coil and the capacitor connected to each fixed contact of the switch according to the present invention is connected to the other end of the power supply. When the switch is closed in this state, the heating coil and the capacitor are simultaneously connected in parallel and connected to the power supply. Further, when the switch is opened and the movable contact is separated from each fixed contact, the heating coil and the capacitor are simultaneously disconnected from the power supply, and further, they are separated from each other.

〔実施例〕〔Example〕

第1図はこの発明の一実施例による誘導加熱装置の概
略構成を示す回路図である。図において、(1)(2A)
(2B)(4A)(4B)は従来のものと同一であるが、本図
の装置は通常2系列式加熱装置と呼ばれ、加熱コイル
(2A)(2B)に加え加熱コイル(9A)(9B)を設けてい
る。そして、両系列の加熱コイル(2A)(2B)および
(9A)(9B)はそれぞれサイズの異なる被加熱材をその
加熱対象としており、図示しないコイル移動装置によ
り、使用する加熱コイルを短時間に切換えることができ
るようになっている。
FIG. 1 is a circuit diagram showing a schematic configuration of an induction heating device according to an embodiment of the present invention. In the figure, (1) (2A)
(2B) (4A) (4B) is the same as the conventional one, but the device in this figure is usually called a two-series heating device, and in addition to the heating coils (2A) (2B), the heating coil (9A) ( 9B) is provided. The heating coils (2A) (2B) and (9A) (9B) of both series are for heating the materials to be heated having different sizes, and the heating coil to be used can be shortened by a coil moving device (not shown). It can be switched.

(8A)はこの発明の要部であって、従来の開閉器
(5)およびコンタクタ(6)の機能を兼ねそなえた開
閉器で、その詳細は第2図、第3図に基づき後述する。
(8B)は高温側コイル(2B)の高周波電源(1)への接
続、切離しを行う開閉器で、作業時の安全上、不使用中
の系列の加熱コイルと高周波電源(1)との接続を完全
に断つためのものである。
(8A) is a main part of the present invention, and is a switch having the functions of the conventional switch (5) and contactor (6), the details of which will be described later with reference to FIGS. 2 and 3.
(8B) is a switch that connects and disconnects the high temperature side coil (2B) to the high frequency power supply (1), and for safety during work, connects the heating coil of the series not in use and the high frequency power supply (1). It is for completely cutting off.

次に第2図、第3図について開閉部(8A)の詳細を説
明する。第2図は開閉器(8A)の機構全体を示す構成
図、第3図はその固定接点の部分を示す斜視図である。
図において、(10)は第1の固定接点で、固定設定(1
1)をともに絶縁板(12)に取付けられている。(13)
および(14)は、それぞれ低温側コイル(2A)の一端と
固定接点(10)と、および低温側コイル(2A)の他端と
固定接点(11)とを接続され導体である。なお、固定接
点への導体の取付けは、例えば前者に設けられたタップ
穴を使用してボルト締め等によりなされる。(15)およ
び(16)は第2および第3の固定接点で、固定接点(1
7)とともに絶縁板(18)に取付けられている。(19)
および(20)は、それぞれ低温側コンデンサ(4A)の一
端と固定接点(15)と、および高周波電源(1)の一端
と固定接点(16)とを接続する導体、(21)は高周波電
源(1)および低温側コンデンサ(4A)のそれぞれの他
端と固定接点(17)とを接続する導体である。(22)お
よび(23)はそれぞれ固定接点(10)(15)(16)およ
び固定接点(11)(17)とその山形の部分で同時に接離
可能に構成された可動接点である。なお、詳細な図示は
省略しているが、各固定接点(10)等には穴加工により
冷却水通路が形成されており、図示しないテトロン製等
のホースを介して冷却水が供給される。また、導体(1
3)等には冷却パイプが適宜ロー付等により固着されて
おりこの冷却パイプ内に冷却水が供給される。
Next, the details of the opening / closing section (8A) will be described with reference to FIGS. FIG. 2 is a block diagram showing the entire mechanism of the switch (8A), and FIG. 3 is a perspective view showing the fixed contact portion thereof.
In the figure, (10) is the first fixed contact, and the fixed setting (1
Both 1) are attached to the insulating plate (12). (13)
Reference numerals (14) and (14) are conductors respectively connecting one end of the low temperature side coil (2A) and the fixed contact (10), and the other end of the low temperature side coil (2A) and the fixed contact (11). The conductor is attached to the fixed contact by, for example, bolting using the tap hole provided in the former. (15) and (16) are the second and third fixed contacts, which are fixed contacts (1
It is attached to the insulating plate (18) together with 7). (19)
And (20) are conductors that connect one end of the low temperature side capacitor (4A) and the fixed contact (15), and one end of the high frequency power supply (1) and the fixed contact (16), respectively, and (21) is a high frequency power supply ( 1) and a conductor for connecting the other end of the low temperature side capacitor (4A) to the fixed contact (17). Reference numerals (22) and (23) are movable contacts configured so that the fixed contacts (10), (15) and (16) and the fixed contacts (11) and (17) and their chevron portions can be simultaneously contacted and separated. Although not shown in detail, a cooling water passage is formed in each fixed contact (10) and the like by drilling, and the cooling water is supplied through a hose made of Tetron (not shown). Also, the conductor (1
A cooling pipe is appropriately fixed to 3) etc. by brazing, etc., and cooling water is supplied into this cooling pipe.

(24)は油圧シリンダで、支持具(25)により回動自
在に支持されたレバー(26)を介して可動接点(22)お
よび(23)をその進退方向に駆動する。(27)は固定−
可動接点間に所定の接着圧力を与えるための皿バネであ
る。
A hydraulic cylinder (24) drives the movable contacts (22) and (23) in the advancing / retreating direction via a lever (26) rotatably supported by a supporting member (25). (27) is fixed-
A disc spring for applying a predetermined adhesive pressure between the movable contacts.

次に動作について説明する。加熱コイル(2)の系列
を使用する場合で、加熱処理量が高レベルのときは、開
閉器(8B)とともに開閉器(8A)も閉とする。即ち、開
閉器(8A)については第2図の状態にある。この場合、
可動接点(22)を介して固定接点(10)と固定接点(1
5)(16)とが、また、可動接点(23)を介して固定接
点(11)と固定接点(17)とがそれぞれ接触状態とな
る。これにより、低温側コイル(2A)および低温側コン
デンサ(4A)が並列となって高周波電源(1)に接続さ
れることになる。ここで、可動−固定接点間は、主とし
て固定接点および絶縁板の平行度、面精度の管理により
十分な精度で確実な接触状態が得られる。なお、開閉器
(8B)はその詳細構造の説明を省略しているが、開閉器
(8A)と類似の構造で、この閉動作により高温側コイル
(2B)が高周波電源(1)に接続されることになる。
Next, the operation will be described. When a series of heating coils (2) is used and the amount of heat treatment is high, the switch (8B) and the switch (8A) are closed. That is, the switch (8A) is in the state shown in FIG. in this case,
Fixed contact (10) and fixed contact (1) via movable contact (22)
5) and (16), and the fixed contact (11) and the fixed contact (17) are brought into contact with each other via the movable contact (23). As a result, the low temperature side coil (2A) and the low temperature side capacitor (4A) are connected in parallel and connected to the high frequency power supply (1). Here, between the movable and fixed contacts, a reliable contact state can be obtained with sufficient accuracy mainly by controlling the parallelism and surface accuracy of the fixed contact and the insulating plate. Although the detailed structure of the switch (8B) is omitted, the switch (8B) has a structure similar to that of the switch (8A), and the closing operation connects the high temperature side coil (2B) to the high frequency power supply (1). Will be.

次に、加熱処理量が低下して開閉器(8A)を開放する
場合は、油圧シリンダ(24)を操作してレバー(26)を
手前に引寄せる。これにより、可動接点(22)および
(23)が共に後退してそれぞれ接触していた固定接点か
ら離反する。固定接点(15)および(16)は、可動接点
(22)と離反すると同時に、相互間も接続が断たれるこ
とになる。従って、低温側コイル(2A)および低温側コ
ンデンサ(4A)は共に高周波電源(1)から着離される
とともに、相互間の並列接続も解除される。
Next, when the heat treatment amount decreases and the switch (8A) is opened, the hydraulic cylinder (24) is operated to pull the lever (26) toward you. As a result, the movable contacts (22) and (23) both retreat and separate from the fixed contacts that were in contact with each other. The fixed contacts (15) and (16) are separated from the movable contact (22) and, at the same time, are disconnected from each other. Therefore, both the low temperature side coil (2A) and the low temperature side capacitor (4A) are attached / detached from the high frequency power source (1), and the parallel connection between them is released.

なお、上記実施例のものは、電流が相互に逆向きに流
れる部分を絶縁板(12)等の表裏に対称配置することに
よりインピーダンスの増加抑制、更に漏洩磁束による周
囲金属の局部発熱の抑制を図る構造のものとしたが、こ
の発明は必ずしも第2図等に示す構成に限られる訳では
ない。
In addition, in the above-mentioned embodiment, impedance increase is suppressed by arranging portions where currents flow in opposite directions symmetrically on the front and back of the insulating plate (12), and further, local heat generation of surrounding metal due to leakage magnetic flux is suppressed. Although the structure is intended, the present invention is not necessarily limited to the configuration shown in FIG.

例えば、可動接点をボルト締付による半固定式の構成
としてもよく、また、上記のような2極開閉式でなく単
極開閉式の組合わせとしてもよい。
For example, the movable contact may be of a semi-fixed type by bolting, or may be a combination of a single-pole open / close type instead of the two-pole open / close type described above.

更に、上記実施例では加熱コイルを2系列設けたもの
について説明したが、この発明は1系列または3系列以
上のものであっても同様に適用することができ同等の効
果を奏する。
Further, in the above embodiment, the heating coil provided with two series has been described, but the present invention can be similarly applied even if it has one series or three series or more, and has the same effect.

また、上記実施例は、加熱コイルをその処理進行方向
に2分割して場合であるが、3分割以上としてもよい。
Further, in the above-mentioned embodiment, the heating coil is divided into two in the processing progress direction, but it may be divided into three or more.

〔発明の効果〕〔The invention's effect〕

以上のように、この発明によれば、電源に対する低温
側コイルと低温側コンデンサとの切り離しを同一の可動
接点で同時に行うようにしたので、低温側コンデンサ切
り離し専用のコンタクタが不要となり、その分装置内の
必要スペースが低減できると共に、低温側コイルと低温
側コンデンサとの切り離し時の動作不良によるコイルと
コンデンサとで決まる共振周波数のずれを防止して、加
熱処理の信頼性を向上することができる。
As described above, according to the present invention, the low temperature side coil and the low temperature side capacitor with respect to the power source are disconnected at the same movable contact at the same time. It is possible to reduce the required space inside and to prevent the deviation of the resonance frequency determined by the coil and the capacitor due to a malfunction when the low temperature side coil and the low temperature side capacitor are disconnected, and improve the reliability of the heat treatment. .

【図面の簡単な説明】[Brief description of drawings]

第1図はこの発明の一実施例による誘導加熱装置の概略
構成を示す図、第2図および第3図はその開閉器の詳細
を示すそれぞれ全体構成図および部分斜視図、第4図は
従来の誘導加熱装置を示す回路図である。 図において、(1)は高周波電源、(2)(2A)(2B)
は加熱コイル、(4)(4A)(4B)はコンデンサ、(8
A)開閉器、(10)、(15)および(16)はそれぞれ第
1、第2および第3の固定接点、(22)は可動接点であ
る。 なお、各図中同一符号は同一または相当部分を示す。
FIG. 1 is a diagram showing a schematic configuration of an induction heating apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are detailed overall views and partial perspective views showing the switch thereof, and FIG. It is a circuit diagram which shows the induction heating apparatus. In the figure, (1) is a high frequency power source, (2) (2A) (2B)
Is a heating coil, (4) (4A) (4B) is a condenser, (8
A) Switches, (10), (15) and (16) are first, second and third fixed contacts, respectively, and (22) is a movable contact. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】電源と、 この電源を共有して並列に接続され被加熱材を誘導加熱
する低温側コイルおよび高温側コイルと、 この各コイルと並列に接続され上記各コイルと対となり
上記電源の出力周波数において上記各コイルのインダク
タンスに共振するキャパシタンスを有する低温側コンデ
ンサおよび高温側コンデンサと、 上記被加熱材を上記低温側コイルから上記高温側コイル
へ通過させて誘導加熱する際、上記被加熱材の加熱処理
量に応じて、上記電源の一端と接続された上記低温側コ
イルの一端および上記電源の一端と接続された上記低温
側コンデンサの一端を電気的に接離する開閉手段と を備えた誘導加熱装置において、 上記開閉手段は、 上記低温側コイルの一端に接続された第1の固定接点
と、 この第1の固定接点と所定間隔をあけて配置され上記低
温側コンデンサの一端に接続された第2の固定接点と、 上記両固定接点と所定間隔をあけて配置され上記電源の
一端に接続された第3の固定接点と、 上記各固定接点と接離可能な1つの可動接点と から構成したことを特徴とする誘導加熱装置。
1. A power source, a low temperature side coil and a high temperature side coil which are connected in parallel to share the power source and which induction-heat a material to be heated, and the power source which is connected in parallel with each coil to form a pair with each coil Low temperature side capacitor and high temperature side capacitor having a capacitance that resonates with the inductance of each coil at the output frequency of, and the above heating target when the above heating target material is passed through the above low temperature side coil to the above high temperature side coil for induction heating. An opening / closing means for electrically connecting and disconnecting one end of the low temperature side coil connected to one end of the power source and one end of the low temperature side capacitor connected to one end of the power source, according to the heat treatment amount of the material. In the induction heating device, the opening / closing means has a first fixed contact connected to one end of the low temperature side coil, and a predetermined distance from the first fixed contact. A second fixed contact which is arranged at a distance and is connected to one end of the low temperature side capacitor; a third fixed contact which is arranged at a predetermined distance from both fixed contacts and is connected to one end of the power source; An induction heating device comprising a fixed contact and one movable contact that can be contacted and separated.
JP2206256A 1990-08-01 1990-08-01 Induction heating device Expired - Lifetime JP2550505B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2206256A JP2550505B2 (en) 1990-08-01 1990-08-01 Induction heating device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2206256A JP2550505B2 (en) 1990-08-01 1990-08-01 Induction heating device

Publications (2)

Publication Number Publication Date
JPH0495385A JPH0495385A (en) 1992-03-27
JP2550505B2 true JP2550505B2 (en) 1996-11-06

Family

ID=16520323

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2206256A Expired - Lifetime JP2550505B2 (en) 1990-08-01 1990-08-01 Induction heating device

Country Status (1)

Country Link
JP (1) JP2550505B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4446964B2 (en) * 2006-01-11 2010-04-07 三菱電機株式会社 Induction heating cooker
US8247749B2 (en) * 2009-07-04 2012-08-21 Inductoheat, Inc. Application of electric induction energy for manufacture of irregularly shaped shafts with cylindrical components including non-unitarily forged crankshafts and camshafts

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0744063B2 (en) * 1988-12-22 1995-05-15 三菱電機株式会社 Induction heating device

Also Published As

Publication number Publication date
JPH0495385A (en) 1992-03-27

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