JP2016058304A - Electric heater and method of manufacturing electric heater - Google Patents

Electric heater and method of manufacturing electric heater Download PDF

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JP2016058304A
JP2016058304A JP2014185202A JP2014185202A JP2016058304A JP 2016058304 A JP2016058304 A JP 2016058304A JP 2014185202 A JP2014185202 A JP 2014185202A JP 2014185202 A JP2014185202 A JP 2014185202A JP 2016058304 A JP2016058304 A JP 2016058304A
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heating wire
terminal
electric heater
wound around
diameter side
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JP6373132B2 (en
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諭 安齋
Satoshi Anzai
諭 安齋
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Shinnetsu Co Ltd
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Shinnetsu Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an electric heater in which disconnection of a wire is suppressed at a point where a heating wire is wound around a terminal and crimped.SOLUTION: An electric heater 1 having a terminal 40 for connection with a power supply, and a heating wire 30 at least one end 31 of which is crimped to the terminal while being wound around the terminal, is constituted to have a reinforcement tube 50 formed cylindrically and an area, where the heating wire is wound around the terminal, is inserted into the inner diameter side, where the reinforcement tube is formed of a material having a springback amount into the enlarged diameter direction, after a compressive load is applied from the outer diameter side, is smaller than that of the heating wire. An inner peripheral surface of the reinforcement tube abuts the heating wire.SELECTED DRAWING: Figure 2

Description

本発明は、電気ヒータ及び電気ヒータの製造方法に関し、特には発熱線を端子に巻き回して圧着させた箇所の断線を抑制したものに関する。   The present invention relates to an electric heater and a method for manufacturing the electric heater, and more particularly, to one that suppresses disconnection of a portion where a heating wire is wound around a terminal and is crimped.

一般にシーズヒータと称される電気ヒータは、例えばステンレス鋼製の筒体（シース）の内部に、螺旋状に形成されたニクロム線などの発熱線を配置し、空隙に酸化マグネシウム等の絶縁体からなる粉末を充填して構成されている。
このような電気ヒータにおいて、発熱線の端部は、例えばニッケル等によって形成された円柱状の端子に巻き回された後に、シースを外径側から圧縮し、減径加工することによって端子に圧着させられる。
特許文献１には、このように端子に発熱線を巻き回して、絶縁粉末を充填した筒体内に配置し、減径加工を行うシーズヒータの製造方法が記載されている。 An electric heater generally referred to as a sheathed heater has a heating wire such as a nichrome wire formed in a spiral shape inside a cylindrical body (sheath) made of, for example, stainless steel, and an insulating material such as magnesium oxide is formed in a gap. It is configured to be filled with a powder.
In such an electric heater, after the end of the heating wire is wound around a cylindrical terminal formed of nickel or the like, for example, the sheath is compressed from the outer diameter side, and crimped to the terminal by reducing the diameter. Be made.
Patent Document 1 describes a method for manufacturing a sheathed heater in which a heating wire is wound around a terminal in this manner and placed in a cylinder filled with insulating powder to reduce the diameter.

特開２００７−１０９４４８号公報JP 2007-109448 A

上述した構成を有するシーズヒータにおいて、発熱線の端部が端子に巻き回された箇所において断線する故障が発生する場合があった。
本発明の課題は、発熱線を端子に巻き回して圧着させた箇所の断線を抑制した電気ヒータ及び電気ヒータの製造方法を提供することである。 In the sheathed heater having the above-described configuration, there may be a failure that breaks at a place where the end of the heating wire is wound around the terminal.
The subject of this invention is providing the manufacturing method of the electric heater which suppressed the disconnection of the location which wound the heat generating wire around the terminal, and was crimped | bonded.

本発明は、以下のような解決手段により、上述した課題を解決する。
請求項１に係る発明は、電源に接続される端子と、少なくとも一方の端部が前記端子に巻き回された状態で前記端子に圧着される発熱線とを有する電気ヒータであって、筒状に形成され前記発熱線が前記端子に巻き回された領域が内径側に挿入される補強管を有し、前記補強管は、外径側から圧縮荷重を負荷した後の拡径方向へのスプリングバック量が前記発熱線よりも小さい材料によって形成され、内周面が前記発熱線と当接することを特徴とする電気ヒータである。 The present invention solves the above-described problems by the following means.
The invention according to claim 1 is an electric heater having a terminal connected to a power source and a heating wire that is crimped to the terminal in a state where at least one end is wound around the terminal. A region where the heating wire is wound around the terminal is inserted into the inner diameter side, and the reinforcement tube is a spring in the diameter expansion direction after a compressive load is applied from the outer diameter side. The electric heater is characterized in that a back amount is made of a material smaller than that of the heating wire, and an inner peripheral surface is in contact with the heating wire.

請求項２に係る発明は、電源に接続される端子の周囲に発熱線を巻き回した領域を、外径側から圧縮荷重を負荷した後の拡径方向へのスプリングバック量が前記発熱線よりも小さい材料によって形成された補強管の内径側に挿入し、前記補強管を減径加工することによって前記発熱線を前記端子に圧着させたことを特徴とする電気ヒータの製造方法である。   In the invention according to claim 2, in the region where the heating wire is wound around the terminal connected to the power source, the springback amount in the diameter expanding direction after applying a compressive load from the outer diameter side is larger than that of the heating wire. The method of manufacturing an electric heater is characterized in that the heating wire is crimped to the terminal by inserting the reinforcing tube made of a small material into the inner diameter side and reducing the diameter of the reinforcing tube.

本発明の発明者らは、端子に巻き回された箇所において発熱線の断線が生じやすい原因は、端子と発熱線との接触面積が不足して電気抵抗（接触抵抗）が増加した結果生じる異常発熱であることを見いだした。
このような接触面積の不足は、発熱線と端子との減径加工後の弾性力による拡径（スプリングバック・弾性回復）に起因するものであると考えられる。
この点、本願発明によれば、外径側から圧縮荷重を負荷した後の拡径方向へのスプリングバック量が発熱線よりも小さい材料によって形成された補強管を発熱体の周囲に配置し、補強管によって発熱線のスプリングバックによる拡径を抑えることによって、発熱線と端子との接触面積を確保し、接触抵抗を低減して過度の発熱を抑制し、断線を防止することができる。 The inventors of the present invention found that the cause of the breakage of the heating wire at the portion wound around the terminal is an abnormality caused as a result of an increase in electrical resistance (contact resistance) due to insufficient contact area between the terminal and the heating wire. Found fever.
Such a shortage of contact area is thought to be due to diameter expansion (springback / elastic recovery) due to the elastic force after diameter reduction between the heating wire and the terminal.
In this regard, according to the present invention, a reinforcing tube formed of a material whose springback amount in the diameter expansion direction after applying a compressive load from the outer diameter side is smaller than the heating wire is disposed around the heating element, By suppressing the expansion of the heating wire due to the spring back by the reinforcing tube, it is possible to secure a contact area between the heating wire and the terminal, reduce contact resistance, suppress excessive heat generation, and prevent disconnection.

以上説明したように、本発明によれば、発熱線を端子に巻き回して圧着させた箇所の断線を抑制した電気ヒータ及び電気ヒータの製造方法を提供することができる。   As described above, according to the present invention, it is possible to provide an electric heater and an electric heater manufacturing method in which disconnection of a portion where a heating wire is wound around a terminal and crimped is suppressed.

本発明の参考例である電気ヒータの構成を示す模式的部分断面図である。It is a typical fragmentary sectional view which shows the structure of the electric heater which is a reference example of this invention. 本発明を適用した電気ヒータの実施例における発熱線と端子との接続箇所の拡大図である。It is an enlarged view of the connection location of a heating wire and a terminal in the example of the electric heater to which the present invention is applied. 実施例の電気ヒータの減径加工時における各部材の応力歪線図である。It is a stress strain diagram of each member at the time of diameter reduction processing of the electric heater of an example.

以下、本発明を適用した電気ヒータ及び電気ヒータの製造方法の実施形態について説明する。
先ず、本発明の参考例として、従来技術に係る電気ヒータ及びその製造方法について説明する。 Hereinafter, an embodiment of an electric heater and an electric heater manufacturing method to which the present invention is applied will be described.
First, as a reference example of the present invention, a conventional electric heater and a method for manufacturing the same will be described.

図１は、参考例の電気ヒータの端部の構成を示す模式的部分断面図である。
参考例の電気ヒータ１は、ヒータ筒体１０、封止部材２０、発熱線３０、端子４０等を有して構成されたシーズヒータである。
ヒータ筒体１０は、電気ヒータ１Ａの外表面部を構成するものであって、例えばステンレス鋼によって円筒状に形成されている。
また、ヒータ筒体１０は、電気ヒータ１の用途に応じて、湾曲あるいは屈曲した形状とされる場合もある。
ヒータ筒体１０の内部には、熱伝導性が良好な絶縁体（例えばＭｇＯ）からなる絶縁粉末が充填されている。 FIG. 1 is a schematic partial cross-sectional view showing a configuration of an end portion of an electric heater of a reference example.
The electric heater 1 of the reference example is a sheathed heater configured to include a heater cylinder 10, a sealing member 20, a heating wire 30, a terminal 40, and the like.
The heater cylinder 10 constitutes an outer surface portion of the electric heater 1A, and is formed in a cylindrical shape by, for example, stainless steel.
Further, the heater cylinder 10 may be curved or bent depending on the application of the electric heater 1.
The heater cylinder 10 is filled with an insulating powder made of an insulator (for example, MgO) having good thermal conductivity.

封止部材２０は、ヒータ筒体１０の端部を閉塞する蓋状の部材である。   The sealing member 20 is a lid-like member that closes the end of the heater cylinder 10.

発熱線３０は、ニッケル−クロム系合金（ニクロム）の線材によって形成され、螺旋状に巻かれている。
発熱線３０は、この螺旋状の巻き回しの中心軸がヒータ筒体１０の中心軸と実質的に同心となるように、ヒータ筒体１０の内部に配置されている。
発熱線３０は、ヒータ筒体１０の内面と間隔を隔てて配置され、この間隔には絶縁粉末が充填されている。
発熱線３０の端部３１は、端子４０に巻き回された状態で、端子４０の端部４１に圧着した状態となっている。 The heating wire 30 is formed of a nickel-chromium alloy (nichrome) wire, and is wound spirally.
The heating wire 30 is arranged inside the heater cylinder 10 so that the center axis of the spiral winding is substantially concentric with the center axis of the heater cylinder 10.
The heating wire 30 is arranged at an interval from the inner surface of the heater cylinder 10, and this interval is filled with insulating powder.
The end 31 of the heating wire 30 is in a state of being crimped to the end 41 of the terminal 40 while being wound around the terminal 40.

端子４０は、電源に接続された電気配線と発熱線３０とを電気的に導通させる部材（電極）である。
端子４０は、例えばニッケルによって円柱状に形成されている。
端子４０は、ヒータ筒体１０と実質的に同心に配置されるとともに、封止部材２０の中央部を貫通してヒータ筒体１０の内外にそれぞれ突出している。
端子４０のヒータ筒体１０外部側の端部には、電源からの配線が接続される。
端子４０のヒータ筒体１０の内部側の端部４１には、発熱線３０の端部３１が巻き回され、圧着される。 The terminal 40 is a member (electrode) that electrically connects the electrical wiring connected to the power source and the heating wire 30.
The terminal 40 is formed in a cylindrical shape with, for example, nickel.
The terminals 40 are disposed substantially concentrically with the heater cylinder 10 and project through the central portion of the sealing member 20 to the inside and outside of the heater cylinder 10.
A wiring from the power source is connected to the end of the terminal 40 on the outside of the heater cylinder 10.
An end portion 31 of the heating wire 30 is wound around the end portion 41 on the inner side of the heater cylinder 10 of the terminal 40 and is crimped.

次に、上述した電気ヒータ１の製造方法について説明する。
先ず、ヒータ筒体１０の内部に発熱線３０及び端子４０を配置し、残部に絶縁粉末を充填する。
このとき、ヒータ筒体１０の径は、完成時の寸法（製品寸法）よりも大きく形成されている。
また、発熱線３０の端部３１における巻き回し内径側の縁部と、端子４０の表面とは、端部３１の内径側に端子４０を挿入するために不可避的に必要な隙間が設けられている。
その後、ヒータ筒体１０の外周面を内径側に押圧することによって、ヒータ筒体１０を所定の製品寸法まで減径加工する。
このとき、発熱線３０の端部３１は、端子４０側へ押圧されて端部４１の外周面に圧着する。 Next, a method for manufacturing the electric heater 1 described above will be described.
First, the heating wire 30 and the terminal 40 are disposed inside the heater cylinder 10, and the remainder is filled with insulating powder.
At this time, the diameter of the heater cylinder 10 is formed larger than the dimension at the time of completion (product dimension).
In addition, a gap necessary for inserting the terminal 40 on the inner diameter side of the end portion 31 is provided between the edge on the winding inner diameter side of the end portion 31 of the heating wire 30 and the surface of the terminal 40. Yes.
Thereafter, the heater cylinder 10 is reduced in diameter to a predetermined product size by pressing the outer peripheral surface of the heater cylinder 10 toward the inner diameter side.
At this time, the end 31 of the heating wire 30 is pressed toward the terminal 40 and is crimped to the outer peripheral surface of the end 41.

しかし、ヒータ筒体１０の外周面への押圧力を除去すると、発熱線３０はスプリングバックによって拡径し、実際には端子４０の表面との間に微小な隙間が形成され、接触抵抗が大きくなる場合があった。
減径加工後、封止部材２０を取り付けてヒータ筒体１０の両端部を封止し、電気ヒータ１は完成する。 However, when the pressing force to the outer peripheral surface of the heater cylinder 10 is removed, the heating wire 30 is expanded in diameter by the spring back, and actually a minute gap is formed between the surface of the terminal 40 and the contact resistance is increased. There was a case.
After the diameter reduction processing, the sealing member 20 is attached to seal both ends of the heater cylinder 10, and the electric heater 1 is completed.

次に、本発明を適用した電気ヒータ及びその製造方法の実施例について説明する。
実施例の説明において、上述した参考例と実質的に共通する箇所については同じ符号を付して説明を省略し、主に相違点について説明する。
図２は、実施例の電気ヒータにおける発熱線と端子との接続箇所の拡大図である。
実施例の電気ヒータにおいては、端子４０の端部４１に発熱線３０の端部３１が巻き回された箇所の外周側に、補強管５０を被せたことを特徴とする。
補強管５０は、端子４０と実質的に同心の円筒状に形成されている。
補強管５０の内周面は、発熱線３０の端部３１の外径側の領域と当接している。
補強管５０の外周面は、ヒータ筒体１０の内周面と間隔を隔てて配置され、この間隔には絶縁粉末が充填されている。 Next, an embodiment of an electric heater to which the present invention is applied and a manufacturing method thereof will be described.
In the description of the embodiments, portions that are substantially the same as those of the reference example described above are denoted by the same reference numerals, description thereof is omitted, and differences are mainly described.
FIG. 2 is an enlarged view of a connection portion between the heating wire and the terminal in the electric heater of the embodiment.
The electric heater according to the embodiment is characterized in that a reinforcing tube 50 is covered on the outer peripheral side of the portion where the end portion 31 of the heating wire 30 is wound around the end portion 41 of the terminal 40.
The reinforcing tube 50 is formed in a cylindrical shape substantially concentric with the terminal 40.
The inner peripheral surface of the reinforcing tube 50 is in contact with the region on the outer diameter side of the end portion 31 of the heating wire 30.
The outer peripheral surface of the reinforcing tube 50 is arranged at a distance from the inner peripheral surface of the heater cylinder 10, and this interval is filled with insulating powder.

補強管５０は、発熱線３０及び端子４０の材料に対して、ヒータ筒体１０を減径加工した後に生じるスプリングバック（弾性回復）量が小さい材料によって形成される。
このような材料は、例えば、発熱線３０の材料よりも（好ましくは発熱体３０及び端子４０の材料よりも）低降伏点の材料である。
補強管５０は、このような塑性変形が生じやすい言わば柔らかい材料を用い、かつ、補強管５０によって抑制された発熱線３０のスプリングバック量が、端子４０の自由スプリングバック量よりも小さくなり、発熱線３０が端子４０に食い込むよう、肉厚に形成することが好ましい。
例えば、発熱線３０がニクロム線であり、端子４０がニッケル製である場合には、補強管５０は、一例として純鉄（Ｆｅ）によって形成することができる。 The reinforcing tube 50 is formed of a material that has a small amount of springback (elastic recovery) that occurs after the diameter reduction of the heater cylinder 10 with respect to the material of the heating wire 30 and the terminal 40.
Such a material is, for example, a material having a lower yield point than the material of the heating wire 30 (preferably, the material of the heating element 30 and the terminal 40).
The reinforcing pipe 50 uses a so-called soft material that easily causes such plastic deformation, and the amount of spring back of the heating wire 30 suppressed by the reinforcing pipe 50 becomes smaller than the amount of free spring back of the terminal 40, thereby generating heat. It is preferable to form the wire 30 thick so that the wire 30 bites into the terminal 40.
For example, when the heating wire 30 is a nichrome wire and the terminal 40 is made of nickel, the reinforcing tube 50 can be formed of pure iron (Fe) as an example.

実施例の電気ヒータ１においては、補強管５０は当初発熱線３０の端部３１を挿入するために不可避的に必要な隙間が確保できる径に形成されており、ヒータ筒体１０の減径加工を行う際に、外径側から絶縁粉末を介して圧縮荷重を受けて減径し、発熱線３０の端部３１を内径側（端子４０側）へ押圧する。   In the electric heater 1 of the embodiment, the reinforcing pipe 50 is formed to have a diameter that can inevitably secure a gap that is inevitably necessary for inserting the end portion 31 of the heating wire 30. When performing, the diameter is reduced by receiving a compressive load from the outer diameter side through the insulating powder, and the end portion 31 of the heating wire 30 is pressed toward the inner diameter side (terminal 40 side).

以下、実施例の効果について図３を参照して説明する。
図３は、実施例の電気ヒータの減径加工時における各部材の応力歪線図である。
図３において、縦軸は応力（上方が圧縮、下方が引張）を示し、横軸は歪を示している。
発熱線３０、端子４０、補強管５０ともに、減径加工時には歪が応力と比例する弾性域を通過後、降伏点を過ぎて塑性域に入る。その後、外径側からの圧縮力を取り除くと、残留応力によって歪が減少するスプリングバック（弾性回復）が発生する。
発熱線３０の線図におけるａ点からｃ点、端子４０の線図におけるｆ点からｅ点、補強管５０の線図におけるｆ‘点からｅ’点の部分がスプリングバックに相当する。
発熱線３０、端子４０、補強管５０それぞれを単独で圧縮した場合の自由スプリングバック量は、図３におけるε発、ε端、ε補となる。 Hereinafter, effects of the embodiment will be described with reference to FIG.
FIG. 3 is a stress strain diagram of each member during diameter reduction processing of the electric heater of the example.
In FIG. 3, the vertical axis indicates stress (upward is compression, lower is tensile), and the horizontal axis indicates strain.
The heating wire 30, the terminal 40, and the reinforcing pipe 50 all enter the plastic region past the yield point after passing through an elastic region in which strain is proportional to the stress during diameter reduction processing. Thereafter, when the compressive force from the outer diameter side is removed, a springback (elastic recovery) in which the strain is reduced by the residual stress occurs.
The points from point a to point c in the diagram of the heating wire 30, point f to point e in the diagram of the terminal 40, and portion from point f 'to point e' in the diagram of the reinforcing tube 50 correspond to springback.
The amount of free spring back when the heating wire 30, the terminal 40, and the reinforcing pipe 50 are individually compressed is the ε origin, the ε end, and the ε complement in FIG.

仮に、補強管５０が設けられていない場合（参考例の構成の場合）には、発熱線３０及び端子４０のスプリングバック量は、実質的にこの自由スプリングバック量と等しくなり、図３におけるｃ点からｅ点までの距離に相当する歪が隙間を形成することになる。   If the reinforcing pipe 50 is not provided (in the case of the configuration of the reference example), the springback amount of the heating wire 30 and the terminal 40 is substantially equal to this free springback amount, and c in FIG. Strain corresponding to the distance from point to point e forms a gap.

実施例においては、発熱線３０に対してスプリングバックが小さい補強管５０を設けたことによって、補強管５０が発熱線３０の拡径を防止するよう作用する。
すなわち、発熱線３０が補強管５０の内周面を押圧しつつ拡径しようとした際に、発熱線３０内部に残留する圧縮応力と、発熱線３０に押圧された結果補強管５０の内部に発生した引張応力とが釣り合う点（図３におけるｇ点）において、発熱線３０の端部３１の拡径は抑えられる。
この場合、発熱線３０の端部３１と端子４０の端部４１との間に発生する隙間は、図３におけるｇ点からｅ点までの距離に相当する歪によって形成されるものとなる。 In the embodiment, by providing the reinforcing tube 50 having a small spring back with respect to the heating wire 30, the reinforcing tube 50 acts to prevent the heating wire 30 from expanding in diameter.
That is, when the heating wire 30 attempts to expand the diameter while pressing the inner peripheral surface of the reinforcing tube 50, the compressive stress remaining inside the heating wire 30 and the result of being pressed by the heating wire 30 are inside the reinforcing tube 50. At the point where the generated tensile stress is balanced (point g in FIG. 3), the diameter expansion of the end 31 of the heating wire 30 is suppressed.
In this case, the gap generated between the end portion 31 of the heating wire 30 and the end portion 41 of the terminal 40 is formed by distortion corresponding to the distance from the point g to the point e in FIG.

以下、具体的な数値例をあげて説明する。
発熱線３０は線径ｄ＝０．６５ｍｍのニクロム線であるとする。
端子４０は、ニッケル製でありかつ端部４１での端子径Ｄ＝３ｍｍであるとする。
補強管５０として、厚さｈ＝１ｍｍの純鉄製の円筒を用いたものとする。
なお、発熱線３０、端子４０、補強管５０の縦弾性係数Ｅ＝２１０００ｋｇ／ｍｍ２であるとする。 Hereinafter, specific numerical examples will be described.
The heating wire 30 is assumed to be a nichrome wire having a wire diameter d = 0.65 mm.
The terminal 40 is made of nickel and has a terminal diameter D = 3 mm at the end 41.
As the reinforcing tube 50, a pure iron cylinder having a thickness h = 1 mm is used.
It is assumed that the longitudinal elastic modulus E of the heating wire 30, the terminal 40, and the reinforcing tube 50 is 21000 kg / mm 2 .

発熱線３０、端子４０、補強管５０の減径時の最大応力を、それぞれσ１＝４５ｋｇ／ｍｍ２、σ２＝２５ｋｇ／ｍｍ２、σ３＝１２ｋｇ／ｍｍ２であるとする。
この場合、発熱線３０、端子４０、補強管５０それぞれの自由スプリングバック量は、以下の通りとなる。
ε発＝σ１／Ｅ＝０．００２１
ε端＝σ２／Ｅ＝０．００１２
ε補＝σ３／Ｅ＝０．０００５７ It is assumed that the maximum stress when the heating wire 30, the terminal 40, and the reinforcing pipe 50 are reduced in diameter is σ1 = 45 kg / mm 2 , σ2 = 25 kg / mm 2 , and σ3 = 12 kg / mm 2 , respectively.
In this case, the free springback amounts of the heating wire 30, the terminal 40, and the reinforcing pipe 50 are as follows.
ε departure = σ1 / E = 0.0021
ε end = σ2 / E = 0.0012
ε complement = σ3 / E = 0.00057

以上の条件において、発熱線３０の圧縮応力と、補強管５０の引張応力とが釣り合う際の発熱線３０と端子４０との隙間は、直径において−０．３８μｍとなる。
ここで、隙間がマイナスになるということは、発熱線３０が端子４０に食い込んで密着していることを示している。
なお、仮に補強管５０を設けない場合には、隙間は、直径において４．１μｍとなり、発熱線３０と端子４０との接触抵抗が増加して異常発熱の原因となる。 Under the above conditions, the gap between the heating wire 30 and the terminal 40 when the compressive stress of the heating wire 30 and the tensile stress of the reinforcing tube 50 are balanced is −0.38 μm in diameter.
Here, the fact that the gap is negative indicates that the heating wire 30 bites into the terminal 40 and is in close contact therewith.
If the reinforcing pipe 50 is not provided, the gap is 4.1 μm in diameter, and the contact resistance between the heating wire 30 and the terminal 40 increases, causing abnormal heat generation.

このように、本実施例においては、補強管５０を設けることによって、発熱線３０のスプリングバックによる拡径を抑制し、発熱線３０の端部３１が端子４０の端部４１から浮き上がって局所的に電気抵抗（接触抵抗）が増大し、異常発熱が発生して断線等の故障の原因となることを防止できる。   Thus, in this embodiment, by providing the reinforcing pipe 50, the diameter of the heating wire 30 due to the spring back is suppressed, and the end portion 31 of the heating wire 30 is lifted from the end portion 41 of the terminal 40 and locally. It is possible to prevent electrical resistance (contact resistance) from increasing and abnormal heat generation to cause a failure such as disconnection.

（変形例）
本発明は、以上説明した実施例に限定されることなく、種々の変形や変更が可能であって、それらも本発明の技術的範囲内である。
例えば、電気ヒータを構成する各部材の形状、構造、材質、製法等は、上述した実施例に限定されず適宜変更することが可能である。 (Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
For example, the shape, structure, material, manufacturing method and the like of each member constituting the electric heater are not limited to the above-described embodiments, and can be changed as appropriate.

１ 電気ヒータ １０ ヒータ筒体
２０ 封止部材 ３０ 発熱線
３１ 端部 ４０ 端子
５０ 補強管 DESCRIPTION OF SYMBOLS 1 Electric heater 10 Heater cylinder 20 Sealing member 30 Heating wire 31 End part 40 Terminal 50 Reinforcing pipe

Claims (2)

電源に接続される端子と、
少なくとも一方の端部が前記端子に巻き回された状態で前記端子に圧着される発熱線と
を有する電気ヒータであって、
筒状に形成され前記発熱線が前記端子に巻き回された領域が内径側に挿入される補強管を有し、
前記補強管は、外径側から圧縮荷重を負荷した後の拡径方向へのスプリングバック量が前記発熱線よりも小さい材料によって形成され、内周面が前記発熱線と当接すること
を特徴とする電気ヒータ。 A terminal connected to a power source;
An electric heater having a heating wire crimped to the terminal in a state where at least one end is wound around the terminal,
A region where the heating wire is wound around the terminal and formed in a cylindrical shape has a reinforcing tube inserted into the inner diameter side,
The reinforcing pipe is formed of a material whose spring back amount in the diameter expansion direction after applying a compressive load from the outer diameter side is smaller than that of the heating wire, and an inner peripheral surface is in contact with the heating wire. Electric heater to do. 電源に接続される端子の周囲に発熱線を巻き回した領域を、外径側から圧縮荷重を負荷した後の拡径方向へのスプリングバック量が前記発熱線よりも小さい材料によって形成された補強管の内径側に挿入し、前記補強管を減径加工することによって前記発熱線を前記端子に圧着させたこと
を特徴とする電気ヒータの製造方法。 Reinforcement formed of a material in which the amount of springback in the diameter-expanding direction after applying a compressive load from the outer diameter side is smaller than that of the heating wire in the region where the heating wire is wound around the terminal connected to the power source A method of manufacturing an electric heater, wherein the heating wire is crimped to the terminal by inserting into the inner diameter side of the tube and reducing the diameter of the reinforcing tube.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6197132B1 (en) * 2016-09-06 2017-09-13 株式会社エム・アイMI Co., Ltd. Piping system parts that prevent the accumulation of exhaust matter on the piping system

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KR102341282B1 (en) * 2021-06-30 2021-12-21 상도전기공업 주식회사 Connector compression structure of sheath heater made of tungsten heating wire

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Publication number Priority date Publication date Assignee Title
JPS5481541A (en) * 1977-12-09 1979-06-29 Matsushita Electric Ind Co Ltd Sheath heater
JPH0572052U (en) * 1992-03-03 1993-09-28 日本航空電子工業株式会社 Crimping structure between cable core and contact
JP2012122280A (en) * 2010-12-09 2012-06-28 Fuji Bolt Seisakusho:Kk Mechanical joint of reinforcing-bar

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5481541A (en) * 1977-12-09 1979-06-29 Matsushita Electric Ind Co Ltd Sheath heater
JPH0572052U (en) * 1992-03-03 1993-09-28 日本航空電子工業株式会社 Crimping structure between cable core and contact
JP2012122280A (en) * 2010-12-09 2012-06-28 Fuji Bolt Seisakusho:Kk Mechanical joint of reinforcing-bar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6197132B1 (en) * 2016-09-06 2017-09-13 株式会社エム・アイMI Co., Ltd. Piping system parts that prevent the accumulation of exhaust matter on the piping system
JP2018041945A (en) * 2016-09-06 2018-03-15 株式会社エム・アイMI Co., Ltd. Piping system component for preventing exhausted matter from being attached and accumulated to piping system

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