JP3040731U - Sheathed heater - Google Patents

Abstract

(57)【要約】 【目的】 本考案は製造作業性が効率的で、耐電圧不良
や作業不良が少なく、かつ耐久寿命の長いシーズヒータ
を提供することを目的とする。 【構成】 電熱線として、電熱用合金帯を用いて構成さ
れるシーズヒータ。 (57) [Summary] [Object] An object of the present invention is to provide a sheathed heater which is efficient in manufacturing workability, has few withstand voltage defects and work defects, and has a long durable life. [Constitution] A sheathed heater constituted by using an electric heating alloy strip as a heating wire.

Description

【考案の詳細な説明】[Detailed description of the invention]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、シーズヒータの電熱線に係わるものであり、詳しくは高出力化する 際にトラブルの少ないシーズヒータに関するものである。 The present invention relates to a heating wire of a sheathed heater, and more particularly to a sheathed heater with less troubles when increasing the output.

【０００２】[0002]

【従来の技術】[Prior art]

従来、シーズヒータの電熱線としては、断面が真円状の電熱用合金線が用いら れていた。 シーズヒータを高出力とするには、電熱線の抵抗値を小さくする必要があり、 図２（ａ−１）および（ａ−２）に示すように、電熱用合金線の直径を大きくす るか、図２（ｂ−１）および（ｂ−２）に示すように、小さい直径の電熱用合金 線を２本用い並列に接続する方法が用いられていた。 大きな直径の電熱用合金線を用いた場合、曲げ強度が大きくて、スパイラルコ イルにしにくく加工作業性が悪い。また、直径が大きい分だけシーズとの絶縁距 離が小さくなり、高出力化による電熱線表面電力密度上昇と相伴って、耐久寿命 の短くなる傾向にあった。 ここで、電熱線表面電力密度とは、電熱線の単位表面積当たりの電熱消費電力 であり、この数字が大きいと電熱線表面からの熱の放熱が小さくなり、電熱線の 温度が上昇し、耐久寿命が低下する。 小さな直径の電熱用合金線を２本用いスパイラルコイルとした場合、２本の電 熱線を接触させずに、絶縁物充填材中に埋設することは技術的に難しい課題であ った。 Conventionally, as a heating wire for a sheathed heater, an alloy wire for heating which has a circular cross section has been used. In order to make the sheathed heater have a high output, it is necessary to reduce the resistance value of the heating wire, and as shown in FIGS. 2A-1 and 2A-2, the diameter of the alloy wire for heating is increased. Alternatively, as shown in FIGS. 2 (b-1) and (b-2), a method has been used in which two electrothermal alloy wires having a small diameter are used and connected in parallel. When a large diameter alloy wire for electric heating is used, the bending strength is large and it is difficult to form a spiral coil and the workability is poor. The larger the diameter, the smaller the insulation distance from the sheath, and the higher the power output, the higher the power density on the heating wire surface, and the shorter the service life. Here, the heating wire surface power density is the electric power consumption per unit surface area of the heating wire.If this number is large, the heat radiation from the heating wire surface is reduced and the heating wire temperature rises, resulting in Service life is reduced. In the case of using a spiral coil with two small-diameter electric heating alloy wires, it was a technically difficult task to embed the two heating wires in the insulating filler without contacting them.

【０００３】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

本考案は、スパイラルコイル作製の作業性が良く、かつ電熱線表面電力密度が 低く、また、電熱線とシーズとの絶縁距離を安全に確保し、不良が少なく、耐久 寿命の長いシーズヒータを提供することを目的とする。 The present invention provides a sheathed heater that has good workability in spiral coil production, low heating wire surface power density, and secures the insulation distance between the heating wire and the sheath, has few defects, and has a long service life. The purpose is to do.

【０００４】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

本考案は電熱線として断面が長方形状の１本の電熱用合金帯を用いて、上記課 題を解決したものである。 The present invention solves the above-mentioned problems by using one electric heating alloy strip having a rectangular cross section as a heating wire.

【０００５】 電熱用合金帯の厚さと幅の比は１：１．４〜５が好ましい。The ratio of thickness to width of the electrothermal alloy strip is preferably 1: 1.4-5.

【０００６】[0006]

【作用】[Action]

電熱用合金帯の厚さは、電熱用合金線の直径に比べ薄く、巻線作業時には、幅 方向でなく厚さ方向に巻き廻しし易い特性となり、スパイラル加工が容易となる 。 また、電熱線とシーズとの絶縁距離も大きくなり、絶縁信頼性が向上する。 The thickness of the alloy band for electric heating is smaller than the diameter of the alloy wire for electric heating, and it has the characteristic that it can be easily wound in the thickness direction rather than in the width direction during winding work, which facilitates spiral processing. Further, the insulation distance between the heating wire and the sheath is increased, and the insulation reliability is improved.

【０００７】 電熱線は１本であるため、２本の電熱用合金線を用いた場合のように、巻線作 業時に電熱線が重なったり、組み立て作業時に電熱線相互が接触することはなく なり、不良品の発生は減少する。Since there is only one heating wire, there is no possibility that the heating wires will overlap during the winding work and will not come into contact with each other during the assembly work as in the case where two heating alloy wires are used. Therefore, the number of defective products is reduced.

【０００８】 電熱線の断面形状が円から長方形になると、同じ断面積でも、電熱線表面積は 大きくなり、電熱線表面電力密度が低くなるので耐久寿命は長くなる。また、電 熱線の電熱表面積の大きいことは、シーズ面への熱伝達が良いことであり、熱効 率の高くなることが期待される。When the cross-sectional shape of the heating wire is changed from a circle to a rectangle, the heating wire surface area is large and the heating wire surface power density is low even if the heating wire has the same cross-sectional area, so that the durable life is extended. In addition, the fact that the heating surface area of the heating wire is large means that the heat transfer to the sheath surface is good, and it is expected that the thermal efficiency will be high.

【０００９】[0009]

【実施例】【Example】

以下、本考案の具体的実施例を図について説明する。 図１（ａ）は本考案によるシーズヒータの一部の破断斜視図、図１（ｂ−１） はその横断面図、図１（ｂ−２）はその縦断面図である。 電熱線１は、電熱用合金帯であり、スパイラルコイルに加工した後、電気端子 のコールドピン４に溶接し、シーズ２の中央に位置するように、マグネシア等の 耐熱絶縁物の充填材３の中に埋設する。 Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings. FIG. 1 (a) is a partially broken perspective view of a sheathed heater according to the present invention, FIG. 1 (b-1) is a transverse sectional view thereof, and FIG. 1 (b-2) is a longitudinal sectional view thereof. The heating wire 1 is an alloy band for electric heating, and after being processed into a spiral coil, it is welded to the cold pin 4 of the electric terminal, and the filler 3 of heat-resistant insulating material such as magnesia is placed so as to be located at the center of the sheath 2. Buried inside.

【００１０】 本考案と従来仕様によるシーズヒータについて、その特性を比較して表１に示 す。実施例は、電熱用合金帯の厚さと幅の比が１：２の実施例Ａと１：４の実施 例Ｂのシーズヒータを作成した。従来仕様は、大きな直径の電熱用合金線を１本 用いた従来仕様Ａと小さな直径の電熱用合金線を２本用いた従来仕様Ｂのシーズ ヒータを作成した。ヒータ仕様は全て共通とし、定格電圧１００Ｖ、定格出力１ ２００Ｗ（抵抗値８．３３Ω）とし、電熱線材質は電熱用ニッケルクロム１種と した。 シーズ管外径は６．６ｍｍ、シーズ管内径は５．８ｍｍとし、電熱線は内径１ ．７ｍｍにスパイラルしたものをシーズ管中央に埋設した。Table 1 shows a comparison of the characteristics of the sheathed heater according to the present invention and the conventional specification. In the example, the sheathed heaters of the example A in which the thickness-width ratio of the electrothermal alloy strip was 1: 2 and the example B in which the ratio was 1: 4 were prepared. As for the conventional specifications, the sheathed heaters of the conventional specification A that uses one large-diameter alloy wire for electric heating and the conventional specification B that uses two small-diameter alloy wires for electric heating were created. All the heater specifications were the same, the rated voltage was 100V, the rated output was 1200W (resistance value 8.33Ω), and the heating wire material was nickel chrome for heating. The outside diameter of the sheath tube is 6.6 mm, the inside diameter of the sheath tube is 5.8 mm, and the heating wire has an inside diameter of 1. A spiral of 7 mm was embedded in the center of the seed tube.

【００１１】[0011]

【表１】 これによると、本考案による電熱線表面電力密度は従来仕様Ａより２０〜３０ ％低くなり、耐久寿命の長くなることが期待される。また、電熱線表面とシーズ との絶縁距離も０．２〜０．３ｍｍ長くなるので耐電圧性は高くなる、さらに作 業のばらつきによる余裕も大きくなり、不良品は少なくなる。 従来仕様Ａの大きな直径の電熱用合金線は固くて、スパイラルコイルに加工し にくく、作業性が悪い。従来仕様Ｂの小さな直径の電熱用合金線を２本並列にス パイラルする場合、コイル間距離が一定でないと、２本の電熱線が接触する恐れ があり、取扱いが困難である。本考案による電熱用合金帯を用いれば厚さが薄い のでその方向にスパイラルすることは容易となり、コイル間ピッチを一様にでき る。[Table 1] According to this, the heating wire surface power density according to the present invention is 20 to 30% lower than the conventional specification A, and it is expected that the durable life is extended. Further, the insulation distance between the surface of the heating wire and the sheath is increased by 0.2 to 0.3 mm, so that the withstand voltage is improved, and the margin due to variations in the work is increased, resulting in fewer defective products. The large-diameter alloy wire for electric heating of the conventional specification A is hard and difficult to process into a spiral coil, resulting in poor workability. When two small diameter heating alloy wires of the conventional specification B are spirally arranged in parallel, the two heating wires may come into contact with each other if the distance between the coils is not constant, which makes the handling difficult. If the alloy band for electric heating according to the present invention is used, it is easy to spiral in that direction because the thickness is thin, and the pitch between the coils can be made uniform.

【００１２】[0012]

【考案の効果】[Effect of the invention]

本考案によれば、シーズヒータの電熱線として電熱用合金帯を用いたので、ス パイラルコイル作製の加工が容易であり、かつ電熱線とシーズとの絶縁距離も長 くなり、耐電圧不良や作業不良が少なくなる、また電熱線表面電力密度が低くな り、耐久寿命の長いシーズヒータを得ることができる。 According to the present invention, since the alloy strip for electric heating is used as the heating wire of the sheathed heater, the fabrication of the spiral coil is easy, and the insulation distance between the heating wire and the sheath is long, and the withstand voltage failure or It is possible to obtain a sheathed heater having a long service life because it reduces work defects and lowers the surface electric power density of the heating wire.

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

【図１】 本考案のシーズヒータの一部の破断斜視図と
横断面図および縦断面図FIG. 1 is a partially cutaway perspective view, a horizontal sectional view and a vertical sectional view of a sheathed heater of the present invention.

【図２】 従来仕様のシーズヒータの横断面図および縦
断面図FIG. 2 is a transverse sectional view and a longitudinal sectional view of a conventional sheath heater.

【符号の説明】[Explanation of symbols]

１ 電熱線Ａ １’電熱線Ｂ ２ シーズ ３ 充填材 ４ コールドピン 1 Heating wire A 1'heating wire B 2 Seeds 3 Filler 4 Cold pin

Claims (1)

【実用新案登録請求の範囲】[Utility model registration claims] 【請求項１】 電熱線として電熱用合金帯を用いたこと
を特徴とするシーズヒータ。1. A sheathed heater using an alloy band for electric heating as a heating wire.