JP2012079647A - Induction heating apparatus and heated body - Google Patents

Induction heating apparatus and heated body Download PDF

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JP2012079647A
JP2012079647A JP2010226390A JP2010226390A JP2012079647A JP 2012079647 A JP2012079647 A JP 2012079647A JP 2010226390 A JP2010226390 A JP 2010226390A JP 2010226390 A JP2010226390 A JP 2010226390A JP 2012079647 A JP2012079647 A JP 2012079647A
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induction heating
heated
heating coil
coil
heated body
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JP5558305B2 (en
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Takuya Sakai
拓也 酒井
Kazunari Nakao
一成 中尾
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an induction heating apparatus capable of suppressing temperature rise of an induction heating coil due to heat conduction from a heated body at low cost.SOLUTION: The induction heating apparatus includes: an induction heating coil 1 that heats a heated body 2; and a fan 7 that supplies air from the side opposite to the side on which the heated body 2 of the induction heating coil 1 is provided, only an air space exists between the induction heating coil 1 and the heated body 2, and the air supplied by the fan 7 is sent to the heated body 2 through the induction heating coil 1.

Description

この発明は、被加熱体からの熱伝導による誘導加熱コイルの温度上昇を低コストにて抑制することができる誘導加熱装置および被加熱体に関するものである。   The present invention relates to an induction heating apparatus and a body to be heated that can suppress an increase in temperature of an induction heating coil due to heat conduction from the body to be heated at low cost.

従来の誘導加熱装置は、加熱コイルと、加熱コイルに隣接して配設され、誘導加熱される被加熱体と、加熱コイルと被加熱体の間に配置された断熱体と、加熱コイルおよび被加熱体に送風して冷却するファンをそれぞれ備えているものである。また、ファンをひとつにするために、外部に風洞を設けコイルおよび被加熱体を冷却するものである（例えば、特許文献１参照）。   A conventional induction heating apparatus includes a heating coil, a heated body that is disposed adjacent to the heating coil and is induction-heated, a heat insulating body that is disposed between the heating coil and the heated body, a heating coil, and a heated body. Each is provided with a fan that blows and cools the heating element. Moreover, in order to use one fan, a wind tunnel is provided outside to cool the coil and the object to be heated (for example, see Patent Document 1).

特開２０１０−１７２１０４号公報JP 2010-172104 A

従来の誘導加熱装置は、加熱コイルおよび被加熱体を冷却するためにそれぞれにファンを設置しておりコストがかかるという問題点があった。また、これらのファンをひとつにするために、風洞を新たに設けるために装置が大型になりかつコストがかかるという問題点があった。   The conventional induction heating apparatus has a problem in that a fan is provided for cooling the heating coil and the object to be heated, which is costly. Further, in order to integrate these fans, there is a problem that the apparatus becomes large and expensive because a new wind tunnel is provided.

この発明は上記のような課題を解決するためになされたものであり、被加熱体からの熱伝導による誘導加熱コイルの温度上昇を低コストにて抑制することができる誘導加熱装置および被加熱体を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an induction heating apparatus and a heated body that can suppress an increase in temperature of the induction heating coil due to heat conduction from the heated body at a low cost. The purpose is to provide.

この発明は、被加熱体を誘導加熱する誘導加熱コイルと、上記誘導加熱コイルの上記被加熱体の配置されている側と相反する側から空気を供給するファンとを備え、上記誘導加熱コイルと上記被加熱体と間には空気層のみが存在し、上記ファンにより供給される空気は上記誘導加熱コイルを介して上記被加熱体に到達するものである。   The present invention includes an induction heating coil that induction-heats a heated body, and a fan that supplies air from a side of the induction heating coil that is opposite to the side where the heated body is disposed. There is only an air layer between the object to be heated, and the air supplied by the fan reaches the object to be heated via the induction heating coil.

この発明の誘導加熱装置は、被加熱体を誘導加熱する誘導加熱コイルと、上記誘導加熱コイルの上記被加熱体の配置されている側と相反する側から空気を供給するファンとを備え、上記誘導加熱コイルと上記被加熱体と間には空気層のみが存在し、上記ファンにより供給される空気は上記誘導加熱コイルを介して上記被加熱体に到達するので、被加熱体および誘導加熱コイルを直接ファンにて冷却することができるため、被加熱体からの熱伝導による誘導加熱コイルの温度上昇を低コストにて抑制することができる。   An induction heating apparatus according to the present invention includes an induction heating coil that induction-heats an object to be heated, and a fan that supplies air from a side of the induction heating coil that is opposite to the side where the object to be heated is disposed, Since only an air layer exists between the induction heating coil and the heated body, and the air supplied by the fan reaches the heated body via the induction heating coil, the heated body and the induction heating coil Can be directly cooled by a fan, so that an increase in temperature of the induction heating coil due to heat conduction from the object to be heated can be suppressed at a low cost.

この発明の実施の形態１の誘導加熱装置および誘導加熱コイルの構成を示す図である。It is a figure which shows the structure of the induction heating apparatus and induction heating coil of Embodiment 1 of this invention. この発明の実施の形態２の誘導加熱装置および誘導加熱コイルの構成を示す図である。It is a figure which shows the structure of the induction heating apparatus and induction heating coil of Embodiment 2 of this invention. この発明の実施の形態３の誘導加熱装置の構成を示す図である。It is a figure which shows the structure of the induction heating apparatus of Embodiment 3 of this invention. この発明の実施の形態４の誘導加熱装置の構成を示す図である。It is a figure which shows the structure of the induction heating apparatus of Embodiment 4 of this invention. この発明の実施の形態５の誘導加熱装置の構成を示す図である。It is a figure which shows the structure of the induction heating apparatus of Embodiment 5 of this invention.

実施の形態１．
以下、本願発明の実施の形態について説明する。図１はこの発明の実施の形態１における誘導加熱装置および誘導加熱コイルの構成を示した断面図および正面図である。ここでは、誘導加熱装置として、誘導加熱を用いてインバータに回生された電力を消費する電子抵抗器を例に説明する。図１において、誘導加熱コイル１は、電気的エネルギー（電力）を誘導加熱の現象にて被加熱体２を加熱するものであり、共振用コンデンサおよび駆動回路（図示せず）などに接続されている。そして、誘導加熱コイル１が生成した磁束を受け誘導加熱により加熱される被加熱体２と、誘導加熱コイル１の被加熱体２の配置されている側と相反する側から空気を供給するファン７とを備えている。そして、誘導加熱コイル１と被加熱体２との間には断熱材などが存在せず、空気層のみが存在し、ファン７により供給される空気（風Ｂ）は誘導加熱コイル１の隙間などを介して被加熱体２に到達する（風Ａ）。被加熱体２には、誘導加熱コイル１が配設されている側と相対する面上に、放熱のためのフィン部２ａが形成されている。 Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a cross-sectional view and a front view showing configurations of an induction heating device and an induction heating coil according to Embodiment 1 of the present invention. Here, an electronic resistor that consumes the electric power regenerated in the inverter using induction heating will be described as an example of the induction heating device. In FIG. 1, an induction heating coil 1 heats an object 2 to be heated by the phenomenon of induction heating with electric energy (electric power), and is connected to a resonance capacitor and a drive circuit (not shown). Yes. And the to-be-heated body 2 which receives the magnetic flux which the induction heating coil 1 generate | occur | produced, and is heated by induction heating, and the fan 7 which supplies air from the side opposite to the side by which the to-be-heated body 2 of the induction heating coil 1 is arrange | positioned. And. There is no heat insulating material between the induction heating coil 1 and the object 2 to be heated, only an air layer is present, and the air (wind B) supplied by the fan 7 is a gap between the induction heating coil 1 and the like. To reach the heated body 2 (wind A). On the surface to be heated 2, fin portions 2 a for heat radiation are formed on the surface opposite to the side where the induction heating coil 1 is disposed.

そして、誘導加熱コイル１は、コイル導線５としての細い線がらせん状に巻回されている。このコイル導線５の間の間隔を形成、維持するために絶縁体で形成されている櫛状もしくはビーズ形状のスペーサ６を挟持して形成している。もしくは、線材として銅板を上記形状に加工して利用してもかまわない。また、コイル導線５の断面形状は、円形のほか多角形、複数の線材がより合わさった形状で形成されていてもよい。さらに、誘導加熱コイル１は熱エネルギーを反射する色に塗装することも考えられる。具体的には、誘導加熱コイル表面を塗装する色としては、例えば金色や銀色などの光沢があるものであればよい。尚、これらの内容は、以下の実施の形態においても同様であるため適宜説明を省略する。   And the induction heating coil 1 is wound with a thin wire as the coil conductor 5 in a spiral shape. In order to form and maintain the space between the coil conductors 5, a comb-like or bead-shaped spacer 6 made of an insulator is sandwiched between the coil conductors 5. Alternatively, a copper plate may be processed into the above shape as a wire. Moreover, the cross-sectional shape of the coil conducting wire 5 may be formed in a circular shape, a polygonal shape, or a shape in which a plurality of wires are more combined. Furthermore, it is conceivable that the induction heating coil 1 is coated in a color that reflects heat energy. Specifically, the color for coating the induction heating coil surface may be any color having a gloss such as gold or silver. Since these contents are the same in the following embodiments, the description will be omitted as appropriate.

上記のように構成された実施の形態１の誘導加熱装置によれば、誘導加熱コイルの被加熱体側では衝突噴流の効果と誘導加熱コイルによる気流の乱れによって被加熱体の壁面での冷却効果が期待できる。しかし、この構成では被加熱体から加熱コイルへの輻射熱が懸念されるが、上記効果による被加熱体の表面温度の低下が見込まれ上記熱伝導の低減が見込まれる。また、被加熱体により暖められた空気が加熱コイルにあたることを防ぐため、従来必要であった断熱材の介在なくして被加熱体から加熱コイルへの熱伝導を減少することができる。さらにふく射を受けにくいコイル表面へ塗装することにより被加熱体から加熱コイルへの熱伝導を減少することができる。このため、加熱コイルと被加熱体の配置によらず、かつ断熱材などを用いなくとも上記被加熱体から加熱コイルへの熱伝導を抑え加熱コイルの温度上昇を小さく維持し、かつ温度上昇してもコイルを形成する巻き線間の絶縁を維持することができる。よって、低コスト、かつ、耐久性を得ることができる。   According to the induction heating apparatus of the first embodiment configured as described above, on the heated object side of the induction heating coil, there is a cooling effect on the wall surface of the heated object due to the effect of the collision jet and the turbulence of the air flow caused by the induction heating coil. I can expect. However, in this configuration, there is a concern about radiant heat from the heated body to the heating coil, but a decrease in the surface temperature of the heated body due to the above effects is expected, and a reduction in the heat conduction is expected. Moreover, in order to prevent the air heated by the to-be-heated body from hitting the heating coil, the heat conduction from the to-be-heated body to the heating coil can be reduced without interposing a heat insulating material that has been necessary in the past. Furthermore, the heat conduction from the object to be heated to the heating coil can be reduced by coating the coil surface which is not easily exposed to radiation. For this reason, regardless of the arrangement of the heating coil and the object to be heated and without using a heat insulating material, the heat conduction from the object to be heated to the heating coil is suppressed and the temperature rise of the heating coil is kept small and the temperature rises. However, the insulation between the windings forming the coil can be maintained. Therefore, low cost and durability can be obtained.

また、コイル導線間が間隔を有しているため空気に触れる表面積が広くなり、伝熱面積が増加され、誘導加熱コイルの熱抵抗が低減される。さらにコイル導線に細い巻き線を使用しているため、伝熱面積が増加するとともに、誘導加熱コイルの巻き線が微小直径円柱のため自然対流時および強制対流時において、熱伝達特性が向上する。そのため、銅損および被加熱体からのふく射による熱を効率よく放熱させることができる。   Moreover, since there is a space between the coil conductors, the surface area in contact with air is increased, the heat transfer area is increased, and the thermal resistance of the induction heating coil is reduced. Further, since a thin winding is used for the coil conductor, the heat transfer area is increased, and the winding of the induction heating coil is a small diameter cylinder, so that heat transfer characteristics are improved during natural convection and forced convection. Therefore, it is possible to efficiently dissipate heat due to copper loss and radiation from the object to be heated.

実施の形態２．
図２はこの発明の実施の形態２の誘導加熱装置の誘導加熱コイルの構成を示す断面図および正面図である。図において、上記実施の形態１と同様の部分は同一符号を付して説明を省略する。誘導加熱コイル１は、コイル導線５、１５の巻回しを複数層形成し、各層のコイル導線５、１５のおいて巻回方向を異なる方向として、各層のコイル導線５、１５を直列に接続して形成されている。具体的には、コイル導線５は反時計回りに巻回され、コイル導線１５は時計回りに巻回され、コイル導線５とコイル導線１５とは中心部分で接続され、２つは直列に接続され、ひとつの誘導加熱コイル１にて構成されているものである。このような構成によって、コイル導線５、１５の中心軸方向から見て、コイル導線５、１５に流れる電流は同じ方向に流れるので、被加熱体２に対して生成する磁束を打消し合うことがない。そして、２つのコイル導線５とコイル導線１５との空間をおき互いが接触しないようにスペーサ１６により間隔が保たれている。 Embodiment 2. FIG.
2 is a cross-sectional view and a front view showing the configuration of the induction heating coil of the induction heating apparatus according to Embodiment 2 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The induction heating coil 1 is formed by forming a plurality of windings of the coil conductors 5 and 15 and connecting the coil conductors 5 and 15 of each layer in series with the winding directions of the coil conductors 5 and 15 of each layer being different directions. Is formed. Specifically, the coil conducting wire 5 is wound counterclockwise, the coil conducting wire 15 is wound clockwise, the coil conducting wire 5 and the coil conducting wire 15 are connected at the central portion, and the two are connected in series. A single induction heating coil 1 is used. With such a configuration, since the currents flowing through the coil conductors 5 and 15 flow in the same direction when viewed from the central axis direction of the coil conductors 5 and 15, it is possible to cancel the magnetic fluxes generated with respect to the heated body 2. Absent. And the space | interval is maintained by the spacer 16 so that the space of the two coil conducting wires 5 and the coil conducting wires 15 may be left, and it may not contact each other.

上記のように構成された実施の形態２の誘導加熱装置によれば、上記実施の形態１と同様の効果を奏するのはもちろんのこと、誘導加熱コイルの形状により巻き数が多くなり、大きなインダクタンスを得ることができる。また、外部回路との接続端子や、複数のコイルを並列接続するための端子を外側に設けることが容易となる。
なお、各層のコイル導線を並列接続してもよい。この場合、コイル導線の中心軸方向から見て、コイル導線に流れる電流は同じ方向にするために、各層における巻回方向を同じ方向にした方が良い。 According to the induction heating device of the second embodiment configured as described above, the number of turns increases due to the shape of the induction heating coil as well as the same effect as that of the first embodiment. Can be obtained. Moreover, it becomes easy to provide a connection terminal with an external circuit and a terminal for connecting a plurality of coils in parallel.
In addition, you may connect the coil conducting wire of each layer in parallel. In this case, when viewed from the central axis direction of the coil conducting wire, it is preferable that the winding direction in each layer be the same direction in order to make the current flowing in the coil conducting wire the same direction.

実施の形態３．
図３はこの発明の実施の形態３の誘導加熱装置の構成を示す図である。図において、上記各実施の形態と同様の部分は同一符号を付して説明を省略する。図において、被加熱体２の誘導加熱コイル１と相反する面上に放熱のフィン部２ｂが形成されたものである。 Embodiment 3 FIG.
FIG. 3 is a diagram showing the configuration of an induction heating apparatus according to Embodiment 3 of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. In the figure, a heat dissipating fin portion 2b is formed on the surface of the object to be heated 2 opposite to the induction heating coil 1.

上記のように構成された実施の形態３の誘導加熱装置によれば、上記各実施の形態と同様の効果を奏するのはもちろんのこと、誘導加熱コイルを通過する風は被加熱体のフィン部に当接するため、被加熱体の熱抵抗値が小さくなり、効率よく被加熱体を冷却することができる。   According to the induction heating apparatus of the third embodiment configured as described above, the wind passing through the induction heating coil is of course the fin part of the object to be heated, as well as the same effects as those of the above embodiments. Therefore, the heat resistance value of the heated object is reduced, and the heated object can be efficiently cooled.

実施の形態４．
図４はこの発明の実施の形態４の誘導加熱装置の構成を示す断面図である。図において、上記各実施の形態と同様の部分は同一符号を付して説明を省略する。図において、被加熱体２０に誘導加熱コイル１の相反する面上にフィン部２０ａが形成されている。また、被加熱体２０の誘導加熱コイル１の配置されている側から相反する側に向けて貫通する通風孔２１を形成する。尚、本実施の形態ではフィン部２０ａを有する被加熱体２０に通風孔２１を形成する場合について示したが、上記他の実施の形態の被加熱体であっても同様の通風孔を形成する例も考えられる。 Embodiment 4 FIG.
4 is a cross-sectional view showing a configuration of an induction heating apparatus according to Embodiment 4 of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. In the figure, a fin portion 20 a is formed on the opposite surface of the induction heating coil 1 in the body to be heated 20. Moreover, the ventilation hole 21 penetrated toward the opposite side from the side where the induction heating coil 1 of the heated body 20 is disposed is formed. In the present embodiment, the case where the ventilation hole 21 is formed in the heated body 20 having the fin portion 20a has been described. However, the same ventilation hole is formed even in the heated body of the other embodiment described above. Examples are also possible.

次に、上記のように構成された実施の形態４の誘導加熱装置の動作は、ファン７により送られた風Ｂは誘導加熱コイル１を冷却したのち、さらに被加熱体２０の内部を、通風孔２１を介して貫通し、被加熱体２０を冷却し外部へ風Ａ’が吹き抜ける。そして、誘導加熱コイル１と被加熱体２０とを冷却する。   Next, in the operation of the induction heating apparatus of the fourth embodiment configured as described above, after the wind B sent by the fan 7 cools the induction heating coil 1, the inside of the heated body 20 is further ventilated. It penetrates through the hole 21, cools the heated body 20, and wind A ′ blows out to the outside. And the induction heating coil 1 and the to-be-heated body 20 are cooled.

上記のように構成された実施の形態４の誘導加熱装置によれば、誘導加熱コイルを冷却するファンと被加熱体を冷却するファンとをひとつのファンにて行うことができる。また、被加熱体で暖められた高温の空気が誘導加熱コイルにあたることを防ぐことができるため、誘導加熱コイルの温度上昇を抑えることができる。また、通風孔により暖められた空気が外部に排気されるため、駆動回路など周辺機器への熱の影響を防ぐことができる。   According to the induction heating apparatus of the fourth embodiment configured as described above, the fan for cooling the induction heating coil and the fan for cooling the object to be heated can be performed by one fan. Moreover, since it can prevent that the high temperature air heated with the to-be-heated body hits the induction heating coil, the temperature rise of the induction heating coil can be suppressed. In addition, since the air heated by the ventilation holes is exhausted to the outside, the influence of heat on peripheral devices such as a drive circuit can be prevented.

実施の形態５．
図５はこの発明の実施の形態５の誘導加熱装置の構成を示す断面図である。図において、上記各実施の形態と同様の部分は同一符号を付して説明を省略する。図５に示すように、被加熱体２０の誘導加熱コイル１が配設されている側と相反する側に、底部を有するフィン部２０ｂを形成している。 Embodiment 5 FIG.
5 is a cross-sectional view showing a configuration of an induction heating apparatus according to Embodiment 5 of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 5, the fin part 20b which has a bottom part is formed in the opposite side to the side by which the induction heating coil 1 of the to-be-heated body 20 is arrange | positioned.

このように形成された実施の形態５によれば、ファン７により送られた風Ｂは被加熱体２０に接続されたフィン部２０ｂの底部に衝突して被加熱体２０を冷却し外部へ風Ｃとして吹き抜ける。このとき風Ｂはフィン部２０ｂの底面に衝突するため、被加熱体２０の放熱効果を高めることができる。   According to the fifth embodiment formed in this way, the wind B sent by the fan 7 collides with the bottom of the fin portion 20b connected to the heated body 20, cools the heated body 20, and winds outside. It blows through as C. At this time, since the wind B collides with the bottom surface of the fin portion 20b, the heat dissipation effect of the heated body 20 can be enhanced.

１ 誘導加熱コイル、２，２０ 被加熱体、２ａ，２ｂ，２０ａ，２０ｂ フィン部、５，１５ コイル導線、６，１６ スペーサ、７ ファン、２１ 通風孔、
Ａ，Ａ’，Ｂ ，Ｃ 風。 DESCRIPTION OF SYMBOLS 1 Induction heating coil, 2,20 To-be-heated body, 2a, 2b, 20a, 20b Fin part, 5,15 Coil lead, 6,16 Spacer, 7 Fan, 21 Ventilation hole,
A, A ', B, C style.

Claims (7)

被加熱体を誘導加熱する誘導加熱コイルと、上記誘導加熱コイルの上記被加熱体の配置されている側と相反する側から空気を供給するファンとを備え、上記誘導加熱コイルと上記被加熱体と間には空気層のみが存在し、上記ファンにより供給される空気は上記誘導加熱コイルを介して上記被加熱体に到達することを特徴とする誘導加熱装置。 An induction heating coil that induction-heats the object to be heated, and a fan that supplies air from a side of the induction heating coil that is opposite to the side where the object to be heated is disposed, the induction heating coil and the object to be heated An induction heating apparatus characterized in that there is only an air layer between them and the air supplied by the fan reaches the heated object via the induction heating coil. 上記誘導加熱コイルは、コイル導線が径方向に複数回巻回され、上記径方向において上記コイル導線間は間隔を有することを特徴とする請求項１に記載の誘導加熱装置。 The induction heating apparatus according to claim 1, wherein the induction heating coil has a coil conductor wound a plurality of times in the radial direction, and the coil conductor has a gap in the radial direction. 上記コイル導線間の間隔を保持するスペーサを備えたことを特徴とする請求項２に記載の誘導加熱装置。 The induction heating apparatus according to claim 2, further comprising a spacer that maintains a space between the coil conductors. 上記誘導加熱コイルは、上記コイル導線の巻回しを複数層形成し、当該各層が直列または並列にて接続されていることを特徴とする請求項２または請求項３に記載の誘導加熱装置。 4. The induction heating apparatus according to claim 2, wherein the induction heating coil includes a plurality of layers of the coil conductor wound, and the layers are connected in series or in parallel. 上記誘導加熱コイルは、上記コイル導線の巻回しを複数層形成し、当該各層のおいて巻回方向を異なる方向として、当該各層を直列に接続して形成されていることを特徴とすると請求項２または請求項３に記載の誘導加熱装置。 The induction heating coil is formed by forming a plurality of windings of the coil conductor, and connecting the layers in series with the winding directions of the layers being different directions. The induction heating apparatus according to claim 2 or claim 3. 上記コイル導線は、熱エネルギーを反射する色が塗装されていることを特徴とする請求項１ないし請求項５のいずれか１項に記載の誘導加熱装置。 The induction heating apparatus according to any one of claims 1 to 5, wherein the coil conductor is coated with a color that reflects thermal energy. 請求項１ないし請求項６のいずれか１項に記載の誘導加熱装置により加熱される上記被加熱体は、
上記誘導加熱コイルの配置されている側から相反する側向けて貫通する通風孔を備えたことを特徴とする被加熱体。 The heated object heated by the induction heating device according to any one of claims 1 to 6,
An object to be heated, comprising a ventilation hole penetrating from the side where the induction heating coil is disposed toward the opposite side.
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