JP2009250474A - Heating drying device of cylindrical body by high-frequency induction heating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an induction heating device free from unevenness in heating or drying in the axial direction and diametrical direction of a heated object, even if an axial length of a cylindrical heated object is longer than its diameter. <P>SOLUTION: The heated object sandwiched by electrodes to which high frequencies are applied is rotated on a long axis to make a temperature in the peripheral direction and a water content uniform, the temperature and the water content of the heated object near the electrodes are arbitrarily controlled by dividing the electrodes to the axial direction and changing positions from the heated object of the electrodes, furthermore auxiliary electrode plates are disposed in a state of being supported by a hinge structure, and an opening angle of the auxiliary electrode plates is changed to perform uniform heating and drying also in the cross-sectional direction of the heated object. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、１〜３００ＭＨｚの高周波を利用し、巻き取られた繊維、ハニカム構造体のセラミックス、円筒状食品などを短時間で加熱あるいは乾燥させるための装置に関するものである。 The present invention relates to an apparatus for heating or drying wound fibers, honeycomb structure ceramics, cylindrical foods and the like in a short time using a high frequency of 1 to 300 MHz.

高周波を利用して円筒状の被加熱物を加熱する場合、アース側電極を一方の端面に接触させ、高圧側電極を対向する端面から一定の間隔をあけて設置するのが普通である。しかし、この装置によると以下のような問題があった。 When a cylindrical object to be heated is heated using a high frequency, it is common to place the ground side electrode in contact with one end face, and place the high voltage side electrode at a certain distance from the facing end face. However, this apparatus has the following problems.

円筒状の被加熱物の軸方向の長さが直径よりも小さい場合には誘電加熱によって効率的に加熱、乾燥することが可能であるが、軸方向の長さが直径を超え、電極間隔が広くなるにつれて加熱効率が非常に低下する。軸方向の長さが直径方向の長さに比べて長い場合の加熱効率を改善する装置として、電極を被加熱物の長軸方向に平行して一対を対向させる方式が提案されている。
特開平６−２９８５６３号公報この装置を用いると、加熱効率は高くできるものの、円筒状の被加熱物の上端面側と下端面側では温度分布が生じる。すなわち、加熱時あるいは乾燥時に移動する水蒸気の移動方向が上向きであること、あるいは加熱空気の対流が上方向であることなどから上下方向に温度分布ができることによるものである。 If the axial length of the cylindrical object to be heated is smaller than the diameter, it can be efficiently heated and dried by dielectric heating, but the axial length exceeds the diameter and the electrode spacing is As it becomes wider, the heating efficiency is greatly reduced. As a device for improving the heating efficiency when the length in the axial direction is longer than the length in the diameter direction, a method has been proposed in which a pair of electrodes are opposed in parallel to the long axis direction of the object to be heated.
When this apparatus is used, the heating efficiency can be increased, but temperature distribution occurs on the upper end surface side and the lower end surface side of the cylindrical object to be heated. That is, this is due to the fact that the direction of water vapor moving during heating or drying is upward, or that the convection of heated air is upward, so that a temperature distribution can be created in the vertical direction.

本発明は、円筒状の被加熱物の軸方向長さが直径に比べて大きい場合でも、被加熱物の軸方向や直径方向で加熱あるいは乾燥の不均一が発生しない誘電加熱装置を提供することを課題としている。 The present invention provides a dielectric heating device in which heating or drying unevenness does not occur in the axial direction or the diameter direction of a heated object even when the axial length of the cylindrical heated object is larger than the diameter. Is an issue.

円筒状物体を誘電加熱する際に用いられてきた両端面に対向する従来の平板状電極では電極間距離が大きくなってしまい、被加熱物に加わる電位差（電界強度）が小さくなり、加熱効率が低下する。本発明の電極は円筒状の被加熱物の長軸に対して平行である。したがって従来の電極より電極間距離は小さくなり、その結果被加熱物に加わる電位差（電界強度）を大きくすることができ、効率的な加熱乾燥が可能となる。さらに、高周波を印加する電極にはさまれた被加熱物を長軸を中心として回転させることにより、周方向の温度、水分を均一なものとすることができる。 The distance between the electrodes is increased in the conventional flat electrodes facing both end faces that have been used for dielectric heating of cylindrical objects, the potential difference (electric field strength) applied to the object to be heated is reduced, and the heating efficiency is increased. descend. The electrode of the present invention is parallel to the long axis of the cylindrical object to be heated. Therefore, the distance between the electrodes is smaller than that of the conventional electrodes, and as a result, the potential difference (electric field strength) applied to the object to be heated can be increased, and efficient heating and drying can be achieved. Furthermore, the temperature and moisture in the circumferential direction can be made uniform by rotating an object to be heated sandwiched between electrodes to which a high frequency is applied about the major axis.

また、加熱乾燥時に被加熱物の内部や外部を移動する蒸気や空気の対流の影響により発生する軸方向の温度、水分の不均一を防止するために、電極を軸方向に対して分割し、それぞれの電極の被加熱物からの位置を変更することにより、電極近傍の被加熱物の温度、水分を任意に制御することが可能となる。 Also, in order to prevent uneven temperature and moisture in the axial direction caused by the influence of convection of steam and air moving inside and outside the heated object during heating and drying, the electrode is divided with respect to the axial direction, By changing the position of each electrode from the object to be heated, the temperature and moisture of the object to be heated near the electrode can be arbitrarily controlled.

さらに、それぞれの主となる電極板の両側にヒンジ構造で支える補助電極板を複数枚設け、補助電極板の開き角度を被加熱物の直径や内部構造に合わせて変更することにより、被加熱物の断面方向についても均一な加熱乾燥を行うことが可能となる。 Furthermore, by providing a plurality of auxiliary electrode plates supported by hinge structures on both sides of each main electrode plate, and changing the opening angle of the auxiliary electrode plates according to the diameter of the object to be heated and the internal structure, Even in the cross-sectional direction, uniform heating and drying can be performed.

本発明による誘電加熱装置を使用して円筒状に巻き取られた繊維、ハニカム構造体のセラミックス、円筒状食品などを短時間でかつ均一に加熱あるいは乾燥させることが可能となる。 Fibers wound in a cylindrical shape using the dielectric heating device according to the present invention, ceramics of a honeycomb structure, cylindrical foods and the like can be heated or dried uniformly in a short time.

以下、図面に基づいて本発明による誘電加熱装置にかかる一実施形態について説明する。図１〜図６は本発明に係る発明の実施の形態を示す。
円筒状に巻き取られた繊維や、ハニカム状の高水分のセラミクスに対して高周波を印加すると、熱風や赤外線などの加熱方法とは異なり被加熱物内部からの自己発熱により均一に加熱される。円筒形状の軸方向の長さが直径より小さい場合には、高周波を利用して円筒状の被加熱物を加熱する場合、図１に示すように、アース側電極１を一方の端面に接触させ、高圧側電極２を対向する端面から一定の間隔をあけて設置するのが普通である。しかし、円筒状の軸方向の長さが直径より大きい場合には電極間距離が大きくなり加熱効率が悪くなるため、本発明で開示したように図２に示す軸方向に平行して設置される電極３を用いる。被加熱物４はターンテーブル５の上にセットされ、回転することにより被加熱物の周囲方向の加熱むらや水分むらが解消される。電極の軸方向の長さは被加熱物の軸方向長さ＋被加熱物の直径を目安として大きめに作られている。被加熱物は絶縁物（碍子あるいは樹脂）の保持台６によってターンテーブル上に保持されており、必要であれば気体が通過するハニカム構造を使用することにより、発生する蒸気を効率的に除去することができる。また、軸を回転軸として利用できる場合には図３に示すようにターンテーブルを必要としない。 Hereinafter, an embodiment of a dielectric heating device according to the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of the invention according to the present invention.
When a high frequency is applied to a cylindrically wound fiber or a honeycomb-like high-moisture ceramic, it is heated uniformly by self-heating from the inside of the object to be heated, unlike a heating method such as hot air or infrared rays. When the cylindrical axial length is smaller than the diameter, when heating the cylindrical object to be heated using high frequency, the ground side electrode 1 is brought into contact with one end face as shown in FIG. In general, the high-voltage side electrode 2 is installed at a predetermined interval from the opposing end face. However, when the cylindrical axial length is larger than the diameter, the distance between the electrodes is increased and the heating efficiency is deteriorated, so that it is installed parallel to the axial direction shown in FIG. 2 as disclosed in the present invention. The electrode 3 is used. The object to be heated 4 is set on the turntable 5 and rotated to eliminate uneven heating and moisture in the peripheral direction of the object to be heated. The length of the electrode in the axial direction is made larger with reference to the axial length of the object to be heated + the diameter of the object to be heated. The object to be heated is held on the turntable by a holding base 6 of an insulator (insulator or resin), and if necessary, the generated steam is efficiently removed by using a honeycomb structure through which gas passes. be able to. Further, when the shaft can be used as a rotating shaft, a turntable is not required as shown in FIG.

電極には同軸構造をもつ給電線７と高周波発振機８が接続されている。
本発明の特徴である電極構造は、図４に示すように電極３は軸方向に分割された構造を持ち、それぞれが被加熱物との距離を変更することができる。電極近傍の被加熱物の温度を上げたい、あるいは乾燥を促進したい場合には電極と被加熱物の距離を小さくすればよく、複数ある電極の位置を調整することにより、被加熱物の軸方向の温度あるいは水分を均一にすることが可能である。 A feed line 7 having a coaxial structure and a high-frequency oscillator 8 are connected to the electrodes.
As shown in FIG. 4, the electrode structure which is a feature of the present invention has a structure in which the electrode 3 is divided in the axial direction, and each can change the distance to the object to be heated. If you want to increase the temperature of the object to be heated near the electrode or accelerate drying, the distance between the electrode and the object to be heated should be reduced, and by adjusting the position of multiple electrodes, the axial direction of the object to be heated It is possible to make the temperature or moisture of the water uniform.

また、被加熱物の直径が変更になった場合や、中心と外側に温度や水分の分布が発生する場合には、図５に示すようにヒンジ構造１０をもつ補助電極１１を設けて補助電極の角度を調整することが有効である。補助電極の角度の効果は、図６の破線で示すように、ヒンジ部分で角度をもたせない場合には被加熱物の中心により多くの電気力線が集中し、ヒンジ部分で角度をもたせると電気力線は被加熱物の外側にも広がる。これらの補助電極の角度の効果により温度や水分を均一にすることが可能であるとともに加熱効率を上げることが可能である。 When the diameter of the object to be heated is changed, or when temperature or moisture distribution occurs at the center and outside, an auxiliary electrode 11 having a hinge structure 10 is provided as shown in FIG. It is effective to adjust the angle. As shown by the broken line in FIG. 6, the effect of the angle of the auxiliary electrode is that when the angle is not provided at the hinge portion, more electric lines of force are concentrated at the center of the object to be heated. The lines of force also extend outside the object to be heated. The temperature and moisture can be made uniform by the effect of the angle of these auxiliary electrodes, and the heating efficiency can be increased.

ガラス繊維ロープを円筒状にまいた製品の水分を乾燥させることを目的として、本発明による電極を用いて高周波による加熱乾燥を実施した。巻き取り後のロール直径は４００ｍｍ、軸方向長さ９００ｍｍである。周波数１３．５６ＭＨＺ、出力２０ｋＷの高周波発振機を用いて、電極幅２００ｍｍ、補助電極幅１００ｍｍ、軸方向長さ３７０ｍｍの電極を軸方向に沿って図４に示すように３対設置した。ロールは毎分６回転の速度で回転させた。補助電極の曲がり角度を４５度とし、３対の電極の製品表面からの最短距離をそれぞれ１５ｍｍ、２０ｍｍ、２５ｍｍに設定した。上記条件で初期水分１０％のロープが、４５分間の加熱乾燥後に水分は１％まで低下し、また表面と中心部、あるいは端面と中心部の水分差も無く均一で良好に乾燥させることができた。 For the purpose of drying the moisture of the product in which the glass fiber rope is cylindrically formed, heat drying by high frequency was performed using the electrode according to the present invention. The roll diameter after winding is 400 mm and the axial length is 900 mm. Three pairs of electrodes having an electrode width of 200 mm, an auxiliary electrode width of 100 mm, and an axial length of 370 mm were installed along the axial direction using a high frequency oscillator having a frequency of 13.56 MHz and an output of 20 kW as shown in FIG. The roll was rotated at a speed of 6 revolutions per minute. The bending angle of the auxiliary electrode was 45 degrees, and the shortest distances from the product surface of the three pairs of electrodes were set to 15 mm, 20 mm, and 25 mm, respectively. Under the above conditions, a rope with an initial moisture of 10% can be dried uniformly and satisfactorily with no moisture difference between the surface and the center, or between the end surface and the center after the heat drying for 45 minutes. It was.

従来の電極の構成図。The block diagram of the conventional electrode. 改良された従来の電極の構成図。The block diagram of the conventional electrode improved. ターンテーブルをもたない回転機構の例。An example of a rotating mechanism without a turntable. 本発明に係る具体的な装置の主要動作部を示す概略図。Schematic which shows the main operation | movement part of the concrete apparatus based on this invention. 本発明に係る、ヒンジ機構をもつ電極を示す概略図。Schematic which shows the electrode which has a hinge mechanism based on this invention. ヒンジ機構をもつ補助電極の動作説明図。Operation | movement explanatory drawing of the auxiliary electrode which has a hinge mechanism.

符号の説明Explanation of symbols

１ 下側電極
２ 上側電極
３ 電極
４ 円筒状被加熱乾燥物
５ ターンテーブル
６ 絶縁保持台
７ 給電腺
８ 高周波電源
９ スライド機構
１０ ヒンジ機構
１１ 補助電極
１２ 回転機構


DESCRIPTION OF SYMBOLS 1 Lower electrode 2 Upper electrode 3 Electrode 4 Cylindrical to-be-heated dried material 5 Turntable
6 Insulation holding table 7 Feeding gland 8 High frequency power supply 9 Slide mechanism 10 Hinge mechanism 11 Auxiliary electrode 12 Rotating mechanism

Claims (4)

１〜３００ＭＨｚの高周波を使用し、円筒状物体を均一に加熱乾燥させる装置において、高周波を印加する電極を被加熱物の軸方向に複数対配置することを特徴とする加熱乾燥装置。 An apparatus for heating and drying a cylindrical object uniformly using a high frequency of 1 to 300 MHz, wherein a plurality of pairs of electrodes to which a high frequency is applied are arranged in the axial direction of an object to be heated. 被加熱物をはさんで両側に設置される複数の電極の被加熱物からの距離を任意に変更できることを特徴とする請求項１記載の加熱乾燥装置。 The heating and drying apparatus according to claim 1, wherein the distance from the object to be heated of the plurality of electrodes installed on both sides of the object to be heated can be arbitrarily changed. 電極の一部をヒンジ構造として角度を可変とし、電極の断面形状を被加熱物の直径、形状に合わせて変形することを特徴とする請求項１記載の加熱乾燥装置。 2. The heating and drying apparatus according to claim 1, wherein a part of the electrode has a hinge structure and the angle is variable, and the sectional shape of the electrode is deformed according to the diameter and shape of the object to be heated. 電極にはさまれた被加熱物を軸を中心として回転させることを特徴とする請求項１記載の加熱乾燥装置。
The heating and drying apparatus according to claim 1, wherein an object to be heated sandwiched between electrodes is rotated about an axis.

Images