JP2010003569A - Heater wire - Google Patents

Heater wire Download PDF

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JP2010003569A
JP2010003569A JP2008162125A JP2008162125A JP2010003569A JP 2010003569 A JP2010003569 A JP 2010003569A JP 2008162125 A JP2008162125 A JP 2008162125A JP 2008162125 A JP2008162125 A JP 2008162125A JP 2010003569 A JP2010003569 A JP 2010003569A
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wire
heater
return
resin
coated
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Hideji Kurogane
秀司 黒金
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Ebara Electric Wire and Cable Co Ltd
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Ebara Electric Wire and Cable Co Ltd
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Priority to JP2008162125A priority Critical patent/JP2010003569A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To carry out quick and safe electricity shutdown by accurately detecting the abnormal heat generation of a heater wire in use by a detecting wire built in the heater wire, in the heater wire equipped with a function of alleviating a leak of a generated magnetic field, that is, the heater wire equipped with a return wire. <P>SOLUTION: Of the heater wire containing an exothermic conductive wire, a return wire, and a detecting wire for the whole length, the exothermic conductive wire is connected to a power source at a root of the heater wire to the return wire at a tip base of the heater wire, the return wire is connected to the power source at a root of the heater, and the detecting wire is connected to the abnormality detector. The exothermic electric wire is formed by coating resin on a winding core with the conductive wire spirally wound, and the heater wire has an outer coating coated on a complex wire formed by twisting the exothermic electric wire with the detecting wire having the detecting wire spirally wound on the exothermic electric wire and a resin-clad return wire having resin coated on the return wire. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、異常発熱時には電流を直ちに遮断し、危険を防止することのできる暖房用ヒーター線に関する。   The present invention relates to a heating heater wire that can immediately cut off current when abnormal heat is generated to prevent danger.

ホットカーペット、電気毛布用など暖房器に用いるヒーター線は、発生磁界の洩れを低減させる機能及び異常発熱時の検知と通電停止する機能を有することが求められている。
前者の機能に関しては、ヒーター線の内部に、第1発熱線と第2発熱線を設けて、両者の電流の流れを逆にして、第1発熱線の電流の流れに起因する磁界を、逆の戻り方向に流れる第2発熱線の電流の磁界で打ち消して発生磁界の洩れを低減する方法が知られている。
この機能を有するヒーター線の場合、電流は電源からヒーター線の第1発熱線から流れて、ヒーター線の末端基で第2発熱線に接続されて、ヒーター線の内部を第2発熱線を逆方向の戻り電流となって流れる。
一方、このようなヒーター線において、衝撃又は急角度の折り曲げを受けた場合に、導線に半断線状態が生じて半断線状態部分の断続的通電によって異常発熱を起こすことがある。
異常発熱した導線の箇所の被覆樹脂が融解して、これが隣接する発熱線の被覆樹脂を融解して、互いに露出した第1発熱線と第2発熱線が直接短絡すると、電気抵抗が激減するので、大きな電流が流れるので、急速な温度上昇を起こし、火災の危険を生じる。
このヒーター線の長手方向の全長に亘って検知線を設け、この検知線と導線との接触を感知して、断続的通電に起因する異常発熱を検知して、直ちに、自動的に通電停止機能を発揮することは知られている。
これら二つの機能を有するヒーター線としては、例えば、特許第3229618号公報があり、この文献には、第1発熱線を芯材にスパイラル状に巻いて形成した内部巻線を耐熱絶縁体で被覆し、さらに、この耐熱絶縁体の被覆の上に、第2発熱線をスパイラル状に巻いて、この上を溶融し易い融解性樹脂で被覆して、この被覆の上に検知線をスパイラル状に巻いたものが開示されている。
この場合、内部の第1発熱線に異常発熱が発生すると、耐熱絶縁体が融解して、ほぼ同時にその外部の溶融し易い融解性樹脂も融解して、検知線が第2発熱線と接触して異常を検知することができ、直ちに通電を自動的に中止できる。そして、第2発熱線に異常発熱が発生すると、直ちに、外部の溶融し易い融解性樹脂被覆が溶解して検知線が第2発熱線と接触して異常を検知することができる。
しかしながら、この技術は、2層の発熱巻線の間の絶縁層として、ポリイミド樹脂等の耐熱絶縁体を使用しているため、耐熱樹脂の剛性が大きく、電気毛布などの細い柔軟なヒーター線の製造は困難である。
また、特許第3312331号公報及び特開平4−278125号公報には、同様の第1発熱線と第2発熱線及び検知線の積層構造が開示されている。
しかしながら、これらの方法では、内部発熱巻線の異常発熱の場合に、内部発熱巻線と外部発熱巻線と信号線の3者がほぼ同時に短絡し、検知線と第2発熱線との接触による温和な短絡条件での検知にならないおそれがある。
また、上記特許文献の欠点を解消するために、特開2005−183018号公報(又は特開2006−261084号公報)のように、上記特許技術の積層方式を3本の樹脂被覆線を互いに接触させながらスパイラル状に撚り合わせる方式が提案されている。この方式では、異常発熱した発熱線の被覆樹脂が溶融したときに、検知線の被覆樹脂が溶解して、異常発熱した発熱線と隣接する検知線との接触が起こり、通電を中止することができる。
この技術では、発熱線の絶縁被覆の融点Th、戻り線の絶縁被覆の融点Tr及び検知線の絶縁被覆の融点Tdとすると、Tr>Th≧Td又はTr>Td>Thの関係を維持することが記載されている。このスパイラル状の構成は、前述の積層方式と異なり、異常発熱線と検知線が直接接しているので、異常発熱の際に、上記の積層型よりも異常が発生した発熱線と検知線との接触が迅速に起こりやすいが、第1発熱線と第2発熱線の接触が同時に起こる可能性を払拭できない。
さらに、ヒーター線の3本の巻き線の撚り合わせ状態が安定していれば良いが、多くの場合、ヒーター線は、上から圧力を受けて扁平になることが多い。
製造直後のヒーター線は、図2(a)のように、樹脂を被覆した発熱電線A、樹脂被覆戻り電線B及び樹脂被覆検知線Cをスパイラル状の3本撚り合わせ複合状態にしたときは、整然とした3円の中心が正三角形の断面を形成している。ところが、ヒーター線の上から強い圧力を受けたり、機器の配線上、極度に曲げて配線すると、図2(b)のような扁平状態になる。このように、発熱電線A、樹脂被覆戻り電線B及び樹脂被覆検知線Cの順になったとき、発熱導線2が半断線状態になり、異常発熱すると、隣接する戻り線(第2発熱線)の導線との間が短絡状態になる問題点がある。すなわち、検知線が検知しない状態で、異常発熱から事故に繋がる。
特許第3229618号公報 特許第3312331号公報 特開平4−278125号公報 特開2005−183018号公報 特開2006−261084号公報
A heater wire used for a heater such as a hot carpet or an electric blanket is required to have a function of reducing leakage of a generated magnetic field and a function of detecting an abnormal heat generation and stopping energization.
Regarding the former function, the first heating wire and the second heating wire are provided inside the heater wire, the current flow of both is reversed, and the magnetic field caused by the current flow of the first heating wire is reversed. There is known a method of reducing leakage of the generated magnetic field by canceling with the magnetic field of the current of the second heating wire flowing in the return direction.
In the case of the heater wire having this function, the current flows from the power source through the first heating wire of the heater wire and is connected to the second heating wire at the terminal end of the heater wire, and the inside of the heater wire is reversed with respect to the second heating wire. It flows as a return current in the direction.
On the other hand, when such a heater wire is subjected to an impact or a sharp bend, a semi-breaking state may occur in the conducting wire, and abnormal heat generation may occur due to intermittent energization of the semi-breaking state portion.
Since the coating resin at the location of the abnormally heated conductor melts and melts the coating resin of the adjacent heating wire, and the first heating wire and the second heating wire exposed to each other are directly shorted, the electrical resistance is drastically reduced. A large current flows, causing a rapid temperature rise and fire hazard.
A detection line is provided over the entire length of the heater wire in the longitudinal direction, the contact between the detection line and the conductor is sensed, abnormal heat generation due to intermittent energization is detected, and the power supply is automatically stopped immediately. It is known to exert
As a heater wire having these two functions, for example, there is Japanese Patent No. 3229618. In this document, an internal winding formed by spirally winding a first heating wire around a core material is covered with a heat resistant insulator. Further, a second heating wire is wound in a spiral shape on the coating of the heat-resistant insulator, and this is covered with a meltable resin that is easy to melt, and the detection wire is spiraled on the coating. A roll is disclosed.
In this case, if abnormal heat generation occurs in the first heating wire inside, the heat-resistant insulator melts, and the meltable resin outside easily melts at the same time, so that the detection wire comes into contact with the second heating wire. Abnormalities can be detected, and energization can be automatically stopped immediately. When abnormal heat generation occurs in the second heat generation line, the meltable resin coating that easily melts externally dissolves and the detection line comes into contact with the second heat generation line to detect abnormality.
However, since this technology uses a heat-resistant insulator such as polyimide resin as an insulating layer between the two layers of heat generating windings, the rigidity of the heat-resistant resin is large, and a thin flexible heater wire such as an electric blanket is used. Manufacturing is difficult.
Japanese Patent No. 3321331 and Japanese Patent Application Laid-Open No. 4-278125 disclose a laminated structure of similar first heat generation lines, second heat generation lines, and detection lines.
However, in these methods, in the case of abnormal heat generation in the internal heat generation winding, the internal heat generation winding, the external heat generation winding, and the signal line are short-circuited almost simultaneously, and the detection line and the second heat generation line are in contact with each other. There is a risk that detection will not occur under mild short-circuit conditions.
In addition, in order to eliminate the drawbacks of the above-mentioned patent document, as described in Japanese Patent Application Laid-Open No. 2005-183018 (or Japanese Patent Application Laid-Open No. 2006-261084), the above-mentioned patented technique is used to contact three resin-coated wires with each other. A method of twisting in a spiral shape while making it happen has been proposed. In this method, when the coating resin of the heating wire that has abnormally heated is melted, the coating resin of the detection wire is melted, and contact between the heating wire that has abnormally heated and the adjacent detection wire may occur, and the energization may be stopped. it can.
In this technique, the relationship of Tr> Th ≧ Td or Tr>Td> Th is maintained, assuming that the melting point Th of the insulating coating of the heating wire, the melting point Tr of the insulating coating of the return wire, and the melting point Td of the insulating coating of the detection wire. Is described. In this spiral configuration, unlike the above-described lamination method, the abnormal heat generation line and the detection line are in direct contact with each other. Although the contact is likely to occur quickly, the possibility that the first heating wire and the second heating wire contact at the same time cannot be eliminated.
Furthermore, it is sufficient that the twisted state of the three windings of the heater wire is stable, but in many cases, the heater wire is often flattened by receiving pressure from above.
As shown in FIG. 2 (a), the heater wire immediately after manufacture is a heat-generating electric wire A coated with resin, a resin-coated return electric wire B, and a resin-coated detection wire C in a spiral-shaped three-stranded composite state. An orderly center of three circles forms a cross section of an equilateral triangle. However, when a strong pressure is applied from above the heater wire, or when the wiring is extremely bent on the wiring of the device, the flat state as shown in FIG. As described above, when the heating wire A, the resin-coated return wire B, and the resin-coated detection wire C are arranged in this order, the heating conductor 2 is in a half-broken state, and abnormal heat is generated, the adjacent return wire (second heating wire) There is a problem that a short circuit occurs between the conductors. That is, an abnormal heat generation leads to an accident in a state where the detection line is not detected.
Japanese Patent No. 3229618 Japanese Patent No. 3321331 JP-A-4-278125 JP 2005-183018 A Japanese Patent Laid-Open No. 2006-261084

本発明は、発生磁界の洩れを低減させる機能を有するヒーター線、すなわち、戻り導線を設けたヒーター線において、使用中のヒーター線の異常発熱をヒーター線に内包させた検知線によって正確に検知して、迅速かつ安全な通電停止を行うことを目的とする。   The present invention accurately detects abnormal heating of a heater wire in use in a heater wire having a function of reducing leakage of a generated magnetic field, that is, a heater wire provided with a return conducting wire, by a detection wire included in the heater wire. The purpose is to stop energization quickly and safely.

本発明は、本発明の目的を達成するために、鋭意研究の結果、異常発熱の起こり易い発熱電線の被覆樹脂の表面に密着させて検知線を巻きつけ、これを戻り電線と撚り合わせる配置によって、異常発熱時に、発熱電線と戻り電線が短絡する前に検知線との接触を確実にして、通電を遮断して、発熱電線と戻り電線の短絡を防止する手段を案出したものである。
すなわち、本発明は、
(1)発熱導線、戻り導線、検知線を全長に亘って内包するヒーター線であって、発熱導線はヒーター線の手元部で電源に接続され、ヒーター線の末端基部で戻り導線に接続され、戻り導線はヒーターの手元部で電源に接続され、検知線は、異常検知器に接続されているヒーター線において、巻き芯に発熱導線をスパイラル状に巻きつけた上に樹脂を被覆した発熱電線を形成し、該発熱電線の上に検知線をスパイラル状に巻きつけた検知線付き発熱電線と、戻り導線に樹脂を被覆した樹脂被覆戻り電線とを互いに撚り合わせて形成した複合電線の上に外被を被覆したことを特徴とするヒーター線、
(2)樹脂被覆戻り電線は、巻き芯に戻り導線をスパイラル状に巻きつけた上に樹脂を被覆したものであることを特徴とする(1)項に記載のヒーター線、及び、
(3)発熱導線の単位長さ当たりの抵抗値は、樹脂被覆戻り電線の単位長さ当たりの抵抗値よりも高いことを特徴とする(1)又は(2)項に記載のヒーター線、
を提供するものである。
In order to achieve the object of the present invention, as a result of intensive research, the detection wire is wound around the surface of the coating resin of the heat generating wire that is likely to generate abnormal heat, and this is twisted with the return wire. In the event of abnormal heat generation, a means has been devised that ensures contact with the detection wire before the heating wire and the return wire are short-circuited, cuts off the power supply, and prevents the heating wire and the return wire from being short-circuited.
That is, the present invention
(1) A heater wire including a heat generating lead, a return lead, and a detection wire over the entire length, the heat generating lead being connected to the power source at the proximal portion of the heater wire and being connected to the return lead at the terminal base of the heater wire, The return wire is connected to the power supply at the heater's hand, and the detection wire is a heater wire connected to the anomaly detector. A heating wire with a sensing wire in which a sensing wire is spirally wound on the heating wire, and a composite coated wire formed by twisting a return conductor and a resin-coated return wire coated with resin on the outside. A heater wire characterized by covering the sheath,
(2) The resin-coated return electric wire is a coiled wire in which a return conductor is wound around in a spiral shape and coated with a resin, and the heater wire according to (1),
(3) The heater wire as set forth in (1) or (2), wherein the resistance value per unit length of the heat conducting wire is higher than the resistance value per unit length of the resin-coated return wire,
Is to provide.

本発明では、検知線が発熱電線の被覆樹脂表面に密着してスパイラル状に巻かれているので、金属面を露出した検知線が、常に発熱電線と樹脂被覆戻り電線との間に存在しているので、発熱導線と戻り導線が短絡する前に確実に検知線が異常発熱した断線の導線と接触し、通電を停止できるので、発熱電線内の発熱導線と樹脂被覆戻り電線内の戻り導線が直接短絡することを完全に回避できる。   In the present invention, since the detection wire is closely wound on the surface of the coating resin of the heating wire and wound in a spiral shape, the detection wire with the metal surface exposed is always present between the heating wire and the resin-coated return wire. Therefore, before the heating conductor and the return conductor are short-circuited, the detection wire can be in contact with the disconnected conductor that has abnormally heated up and the power supply can be stopped.Therefore, the heating conductor in the heating cable and the return conductor in the resin-coated return cable are disconnected. Direct short circuit can be completely avoided.

本発明に用いる発熱導線は、ヒーターの発熱源となる導線であり、断面寸法0.005〜0.2mm2程度の金属線であれば、特に、制限なく使用することができる。そして、この金属線を、発熱電線の単位長さ(cm)当たり、抵抗値0.002〜5Ω程度になるように、スパイラル状に巻き芯に巻き付けて使用することができる。スパイラル状に巻くのは、発熱電線の単位長さ当たりの発熱量(抵抗値0.002〜5Ωに対応)を増加するためである。金属線の材質としては、経済的で、電気抵抗が少なく、柔軟性を有する銅が好ましい。
本発明に用いる戻り導線は、発熱導線と同一の金属線を同様に巻き芯に巻き付けて用いることができる。戻り導線を巻き芯に巻き付けて用いた場合は、発熱電線と戻り導線とを区別をすることができなくなるが、いずれにしても、本発明ではどちらか一方に検知線を巻きつけることを必須構成とするものであり、検知線を巻き付けた方を本発明の発熱電線と定義する。通常は、ヒーター線の単位長さ当たりの発熱量の大きい方に、検知線を巻きつける方が望ましい。
また、別の態様として、発熱導線より、戻り導線の金属線の断面積を大きくしたり、金属線の巻きピッチ間隔を大きくして全長を短くしたりすることによって、樹脂被覆戻り電線の単位長さ当たりの抵抗値を低くして、樹脂被覆戻り電線の発熱量を発熱電線の発熱量より低い発熱量にすることができる。
戻り導線の長さは、スパイラル状の巻き数を少なくしたり、スパイラル状にしないことによって、行うことができる。
本発明のヒーター線においては、樹脂被覆戻り電線の発熱量を、発熱電線の発熱量より低くすることによって、異常発熱が発生する確率を、直接表面に検知線が巻かれている発熱電線の方に集中させて、迅速で確実な異常検知を達成させることができる。
The exothermic conducting wire used in the present invention is a conducting wire that serves as a heat source for the heater, and any metal wire having a cross-sectional dimension of about 0.005 to 0.2 mm 2 can be used without particular limitation. The metal wire can be used by being wound around a winding core in a spiral shape so that the resistance value is about 0.002 to 5Ω per unit length (cm) of the heating wire. The reason for winding in a spiral is to increase the amount of heat generated per unit length of the heating wire (corresponding to a resistance value of 0.002 to 5Ω). The material of the metal wire is preferably copper which is economical, has low electrical resistance, and has flexibility.
The return conductor used in the present invention can be used by winding the same metal wire as the heat generating conductor around the winding core in the same manner. When the return conductor is wound around the winding core, it becomes impossible to distinguish between the heating wire and the return conductor, but in any case, in the present invention, it is essential to wrap the detection wire around either one The direction where the detection wire is wound is defined as the heating wire of the present invention. Usually, it is desirable to wrap the detection wire around the one where the heat generation amount per unit length of the heater wire is large.
Further, as another aspect, the unit length of the resin-coated return electric wire can be shortened by increasing the cross-sectional area of the metal wire of the return wire or by increasing the winding pitch interval of the metal wire to shorten the overall length. By reducing the resistance value per unit, the heat generation amount of the resin-coated return wire can be made lower than the heat generation amount of the heat generation wire.
The length of the return conducting wire can be set by reducing the number of spiral turns or not making it spiral.
In the heater wire of the present invention, the heat generation amount of the resin-coated return wire is made lower than the heat generation amount of the heat generation wire, so that the probability of occurrence of abnormal heat generation is determined for the heat generation wire whose detection wire is wound directly on the surface. It is possible to achieve quick and reliable abnormality detection by concentrating on the system.

本発明に用いる検知線は、金属線であればよく、発熱導線又は戻り導線と接触したときに瞬間的に電流が流れるので、金属の種類にかかわらず、どのような金属でも使用することができる。特に、細い金属線にしたときに、屈曲、圧縮又は衝撃によって、断線しない耐屈曲性と耐衝撃性のよい金属線が好ましい。特に好ましいのは、繰り返し屈曲性に優れている点で、純ニッケル線などが好ましい。
本発明では、検知線を発熱電線の表面に直接スパイラル状に巻き付けているので、発熱電線に異常発熱が発生して、発熱電線の被覆樹脂が溶解した場合は、直ちに、検知線と発熱導線が接触して、検知器に電流が流れて、異常を検知して、通電を停止できる。
また、樹脂被覆戻り電線に異常発熱が発生しても、樹脂被覆戻り電線の樹脂が溶解したときに、直ぐ傍に存在する発熱電線の表面の検知線に戻り導体が接触する。戻り導線が、樹脂被覆の中の発熱導線に、接触することはない。異常発熱を検知線と戻り導線の接触で検知したときに、通電が停止されるので、発熱電線の樹脂被膜が溶解することはない。
検知線が発熱電線の表面にスパイラル状に巻かれていて、かつ、検知線付き発熱電線と樹脂被覆戻り電線が互いに撚り合わせられている構造によって、異常発熱が発生する箇所がヒーター線の全長のどこであっても、必然的に異常発生箇所の導線と検知線が接触することになる。
The detection wire used in the present invention may be a metal wire, and since an electric current flows instantaneously when it comes into contact with the heat generating lead wire or the return lead wire, any metal can be used regardless of the type of metal. . In particular, when a thin metal wire is used, a metal wire having good bending resistance and impact resistance that does not break due to bending, compression, or impact is preferable. Particularly preferred is a pure nickel wire because it is excellent in repeated flexibility.
In the present invention, since the detection wire is directly wound around the surface of the heating wire in a spiral shape, if the heating wire is abnormally heated and the coating resin of the heating wire is dissolved, the detection wire and the heating wire are immediately connected. When contacted, a current flows through the detector, an abnormality is detected, and energization can be stopped.
Further, even if abnormal heat generation occurs in the resin-coated return wire, when the resin of the resin-coated return wire is dissolved, the return conductor comes into contact with the detection wire on the surface of the heat-generating wire that exists immediately. The return conductor does not contact the heat generating conductor in the resin coating. When abnormal heat generation is detected by contact between the detection wire and the return lead, the energization is stopped, so that the resin coating of the heating wire does not dissolve.
The detection wire is spirally wound around the surface of the heating wire, and the heating wire with detection wire and the resin-coated return wire are twisted together, so that the location where abnormal heat generation occurs is the length of the heater wire. Regardless of the location, the conductor where the abnormality occurs and the detection line inevitably come into contact.

本発明の発熱電線及び樹脂被覆戻り電線の被覆樹脂は、ヒーター線に必要な柔軟性を有し、繰り返しの折り曲げに対して耐えられる強度を有し、常時使用温度で融解しない熱可塑性樹脂であれば、通常の積層ヒーター線絶縁層に使用されるものを特に制限することなく使用することができる。例えば、ポリエチレン、ポリプロピレン、エチレンプロピレンコポリマー、ポリブチレンなどのポリオレフィン類、ナイロン6、ナイロン66、ナイロン11、ナイロン12などのポリアミド類などの合成樹脂製のものを使用することができる。特に、ポリエチレン、ポリプロピレン、エチレンプロピレンコポリマー、ナイロンなどの熱可塑性合成樹脂製のものを好適に使用することができる。ナイロン12製のものを特に好適に使用することができる。   The covering resin of the heating wire and the resin-covered return wire of the present invention should be a thermoplastic resin that has the necessary flexibility for the heater wire, has the strength to withstand repeated bending, and does not melt at normal use temperatures. For example, what is used for a normal laminated heater wire insulating layer can be used without any particular limitation. For example, those made of synthetic resins such as polyolefins such as polyethylene, polypropylene, ethylene propylene copolymer and polybutylene, and polyamides such as nylon 6, nylon 66, nylon 11 and nylon 12 can be used. In particular, those made of a thermoplastic synthetic resin such as polyethylene, polypropylene, ethylene propylene copolymer, and nylon can be suitably used. Those made of nylon 12 can be used particularly preferably.

本発明に用いる発熱電線及び樹脂被覆戻り電線の直径は、暖房用具用ヒーター線仕様に応じて適宜選択することができる。両者の直径は同一が望ましいが、通常は、直径0.5〜10mmのものを使用することができる。
本発明の巻き芯に用いる材質は、巻き芯の使用に耐えられる剛性と柔軟性がある絶縁材料であれば、いかなる材質も使用することができる。通常、直径0.6mmの樹脂線を使用することができる。この場合、樹脂は、熱硬化性樹脂でもある程度の柔軟性があれば使用することができる。
本発明のヒーター線の最外側の外被7に用いる材質は、通常電線の外側被覆に用いるものであれば、特に制限なく用いることができる。樹脂を用いる場合は、屈曲性がある比較的融点が高い熱可塑性樹脂又は屈曲性がある熱硬化性樹脂が望ましい。
The diameters of the heating wire and the resin-coated return wire used in the present invention can be appropriately selected according to the heater wire specifications for the heating tool. The diameters of both are preferably the same, but usually those having a diameter of 0.5 to 10 mm can be used.
As the material used for the winding core of the present invention, any material can be used as long as it is an insulating material having rigidity and flexibility that can withstand the use of the winding core. Usually, a resin wire having a diameter of 0.6 mm can be used. In this case, even if the resin is a thermosetting resin, it can be used if it has a certain degree of flexibility.
The material used for the outermost jacket 7 of the heater wire of the present invention can be used without particular limitation as long as it is usually used for the outer sheath of the electric wire. In the case of using a resin, a thermoplastic resin having flexibility and a relatively high melting point or a thermosetting resin having flexibility is desirable.

本発明の1態様の実施例の図面によって説明する。
図1は、本発明実施例のヒーター線の中間部の内部構造を示す斜視図である。図の左側は、ヒーター線が電源に接続されるヒーター線の手元(図面では省略)側であり、右側は、ヒーター線の末端(図示していない)側である。
図1の発熱導線2は、ヒーター線の手元側の電源と接続されて、ヒーター線の末端において、戻り導線4と接続している。電源−発熱導線2−戻り導線4−電源の回路を形成している。
発熱電線Aは、巻き芯1に発熱導線2がスパイラル状に巻かれて、融点180℃のナイロン12の被覆樹脂5によって被覆して形成されている。
発熱電線Aの被覆樹脂5の表面には、直径0.08mmのニッケル製検知線3がスパイラル状にピッチ間隔0.4mmで巻き付けられている。検知線3は、被覆樹脂5の表面に食い込むように巻き付いているので、検知線つき発熱電線Aは、一体的電線として取り扱える。
樹脂被覆戻り電線Bも巻き芯1に発熱導線2がスパイラル状に巻かれて、融点210℃のポリエステルエラストマーの被覆樹脂6によって被覆して形成されている。
発熱電線及び樹脂被覆戻り電線の直径は両者とも1.07mmであり、同一直径であるために、発熱電線及び樹脂被覆戻り電線を撚り合わせ複合電線の形状は全長に亘って断面形状をほぼ均一な円形にすることができる。撚り合わせのピッチは、ヒーターの長さ方向に25mmであり、ヒーターの全長に亘って、両電線は互いに強く密着している。このとき、検出線は、発熱電線の被覆樹脂に全長に亘って、密着している。さらに、樹脂被覆戻り電線の被覆樹脂は、発熱電線に全長に亘って、密着しているので、発熱電線の表面に一体的にスパイラル状に巻きついている露出検知線とも、ほぼ全長に亘って密着している。
この撚り合わせた複合電線の表面を、塩化ビニル樹脂で被覆して、直径3.25mmのヒーター線を形成している。
An embodiment of one aspect of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an internal structure of an intermediate portion of a heater wire according to an embodiment of the present invention. The left side of the figure is the hand side (not shown) of the heater line where the heater line is connected to the power source, and the right side is the end (not shown) side of the heater line.
1 is connected to a power supply on the proximal side of the heater wire, and is connected to the return wire 4 at the end of the heater wire. A circuit of power source-heating conductor 2-return conductor 4-power source is formed.
The heat generating wire A is formed by winding a heat generating conductive wire 2 around a winding core 1 in a spiral shape and covering it with a coating resin 5 of nylon 12 having a melting point of 180 ° C.
On the surface of the coating resin 5 of the heating wire A, a nickel detection wire 3 having a diameter of 0.08 mm is wound spirally at a pitch interval of 0.4 mm. Since the detection wire 3 is wound around the surface of the coating resin 5, the heating wire A with the detection wire can be handled as an integral wire.
The resin-coated return electric wire B is also formed by winding the heat generating conductive wire 2 around the winding core 1 in a spiral shape and covering it with a polyester elastomer coating resin 6 having a melting point of 210 ° C.
The diameters of the heating wire and the resin-coated return wire are both 1.07 mm, and are the same diameter. Therefore, the shape of the composite wire is almost uniform over the entire length by twisting the heating wire and the resin-coated return wire. Can be round. The twisting pitch is 25 mm in the length direction of the heater, and both electric wires are in close contact with each other over the entire length of the heater. At this time, the detection wire is in close contact with the covering resin of the heating wire over the entire length. Further, since the coating resin of the resin-coated return wire is in close contact with the heat generating wire over the entire length, it is also in close contact with the exposed detection wire that is integrally wound around the surface of the heat generating wire in a spiral shape. is doing.
The surface of the twisted composite electric wire is covered with a vinyl chloride resin to form a heater wire having a diameter of 3.25 mm.

本実施例では、発熱導線及び戻り導線は同一の断面寸法0.045×0.3mmの銅合金平角線を使用している。そして巻き芯1は、ポリエステル製の直径は、0.6mmのモノフィラメントを用いている。
発熱電線は、単位ヒーター線の長さ当たりの抵抗を0.1043Ω/cmになるように、スパイラル状の巻きピッチを調整し、樹脂被覆戻り電線は、0.0501Ω/cmになるように、巻きピッチを調節して樹脂被覆戻り電線の発熱量を発熱電線より少し低くなるようにした。巻きピッチの間隔によって、発熱導線及び戻り導線の全長が決まり、発熱量も決まる。
発熱電線には、検知線3がスパイラル状に巻き付けてあり、発熱導線に異常発熱が発生して被覆樹脂が溶融して、発熱導線が露出した場合に、直ちに、検知線に接触して、通電されて異常を検知できる。また、発熱電線と樹脂被覆戻り電線は、互いに強く密着して撚り合わせられているので、戻り導線に異常が発生して樹脂被覆戻り電線の樹脂が溶融して戻り導線が露出した場合も、まず、戻り導線が検知線に接触する。異常発熱の熱によって溶融した樹脂被覆戻り電線の樹脂の熱によって、発熱電線の樹脂が溶融して、発熱電線が露出して、戻り導線と短絡する前に、検知線の信号を受けた検知器によって、通電が停止されるので、戻り導線と発熱電線の短絡は発生しない。この短絡が、ヒーター線の電源側に近い位置で起こると、異常発熱は急激に拡大する。
本実施例の場合は、発熱電線及び樹脂被覆戻り電線の両方が発熱源となるが、導線の巻きピッチが狭く、発熱量が多い発熱電線の方に異常発熱が発生する確率が大きくなり、発熱電線に、食い込むように、巻き付けた検知線と発熱導線との接触が確実に実行できる。
In this embodiment, the heat conducting wire and the return conducting wire use copper alloy rectangular wires having the same cross-sectional dimension of 0.045 × 0.3 mm. The winding core 1 is a monofilament made of polyester having a diameter of 0.6 mm.
For the heating wire, the spiral winding pitch is adjusted so that the resistance per unit heater wire length is 0.1043 Ω / cm, and the resin-coated return wire is wound so that the resistance is 0.0501 Ω / cm. The amount of heat generated by the resin-coated return wire was made slightly lower than that of the heat-generating wire by adjusting the pitch. Depending on the winding pitch interval, the total length of the heat generating lead wire and the return lead wire is determined, and the amount of heat generation is also determined.
The detection wire 3 is spirally wound around the heating wire. When abnormal heating occurs in the heating wire and the coating resin melts and the heating wire is exposed, it immediately contacts the detection wire and is energized. Can detect anomalies. In addition, since the heating wire and the resin-coated return wire are twisted in close contact with each other, even if an abnormality occurs in the return conductor and the resin of the resin-coated return wire melts and the return wire is exposed, The return lead contacts the detection line. Detector that receives the signal of the detection line before the resin of the heat generation wire melts due to the heat of the resin-coated return wire melted by the heat of abnormal heat and the heat generation wire is exposed and short-circuited with the return lead As a result, the energization is stopped, so that a short circuit between the return conductor and the heating wire does not occur. When this short circuit occurs at a position near the power supply side of the heater wire, the abnormal heat generation rapidly expands.
In the case of this example, both the heat generating wire and the resin-covered return wire are heat sources, but the winding pitch of the conductive wires is narrow, and the probability of abnormal heat generation occurring in the heat generating wire with a large amount of heat generation increases. Contact between the wound detection wire and the heat conducting wire can be reliably performed so as to bite into the electric wire.

本発明は、暖房用ヒーター線を用いる暖房機器分野において、火災発生予防策として有用に利用できる。   INDUSTRIAL APPLICABILITY The present invention can be effectively used as a fire prevention measure in the field of heating equipment using a heater wire for heating.

本発明のヒーター線の一態様の中間部の内部構造を示す斜視図である。It is a perspective view which shows the internal structure of the intermediate part of the one aspect | mode of the heater wire of this invention. 従来技術のヒーター線が押圧によって扁平になった状態の断面図である。It is sectional drawing of the state by which the heater wire of the prior art was flattened by press.

符号の説明Explanation of symbols

A 発熱電線
B 樹脂被覆戻り電線
C 樹脂被覆検知線
1 巻き芯
2 発熱導線
3 検知線
4 戻り導線
5 被覆樹脂
6 被覆樹脂
7 外被
A Heating wire B Resin-coated return wire C Resin-coated sensing wire 1 Winding core 2 Heating wire 3 Sensing wire 4 Returning wire 5 Coating resin 6 Coating resin 7 Jacket

Claims (3)

発熱導線、戻り導線、検知線を全長に亘って内包するヒーター線であって、発熱導線はヒーター線の手元部で電源に接続され、ヒーター線の末端基部で戻り導線に接続され、戻り導線はヒーターの手元部で電源に接続され、検知線は、異常検知器に接続されているヒーター線において、巻き芯に発熱導線をスパイラル状に巻きつけた上に樹脂を被覆した発熱電線を形成し、該発熱電線の上に検知線をスパイラル状に巻きつけた検知線付き発熱電線と、戻り導線に樹脂を被覆した樹脂被覆戻り電線とを互いに撚り合わせて形成した複合電線の上に外被を被覆したことを特徴とするヒーター線。   A heater wire that includes a heat generating lead, a return lead, and a detection wire over the entire length, and the heat generating lead is connected to the power supply at the proximal portion of the heater wire, is connected to the return lead at the terminal base of the heater wire, and the return lead is Connected to the power supply at the heater's hand, the detection wire is a heater wire connected to the anomaly detector, forming a heat generating wire covered with resin on a winding core wound in a spiral shape, Cover the sheath on a composite wire formed by twisting together a heat-generating wire with a detection wire that is wound around the heat-generating wire in a spiral shape and a resin-coated return wire that is coated with resin on the return conductor. A heater wire characterized by 樹脂被覆戻り電線は、巻き芯に戻り導線をスパイラル状に巻きつけた上に樹脂を被覆したものであることを特徴とする請求項1に記載のヒーター線。   The heater wire according to claim 1, wherein the resin-coated return electric wire is obtained by winding a lead wire around a winding core in a spiral shape and coating a resin. 発熱導線の単位長さ当たりの抵抗値は、樹脂被覆戻り電線の単位長さ当たりの抵抗値よりも高いことを特徴とする請求項1又は2に記載のヒーター線。   3. The heater wire according to claim 1, wherein a resistance value per unit length of the heat conducting wire is higher than a resistance value per unit length of the resin-coated return wire.
JP2008162125A 2008-06-20 2008-06-20 Heater wire Pending JP2010003569A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011238437A (en) * 2010-05-10 2011-11-24 Ebara Electric Wire Co Ltd Heater wire

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10340778A (en) * 1997-06-05 1998-12-22 Totoku Electric Co Ltd Heater wire
JP2006261084A (en) * 2005-02-18 2006-09-28 Totoku Electric Co Ltd Heater wire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10340778A (en) * 1997-06-05 1998-12-22 Totoku Electric Co Ltd Heater wire
JP2006261084A (en) * 2005-02-18 2006-09-28 Totoku Electric Co Ltd Heater wire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011238437A (en) * 2010-05-10 2011-11-24 Ebara Electric Wire Co Ltd Heater wire

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