JP4306293B2

JP4306293B2 - Sheet electric heater

Info

Publication number: JP4306293B2
Application number: JP2003083958A
Authority: JP
Inventors: 健妹尾; 孝菅原
Original assignee: Fujitsu General Ltd
Current assignee: Fujitsu General Ltd
Priority date: 2003-03-26
Filing date: 2003-03-26
Publication date: 2009-07-29
Anticipated expiration: 2023-03-26
Also published as: JP2004296150A

Description

【０００１】
【産発明の属する技術分野】
本発明は電気カーペット、電気毛布、パネルヒータ等の面状電気暖房器に係わり、詳しくは、電磁波の発生を抑え、暖房器本体の発熱面を容易に、複数に分割構成することができる発熱体の配設構造に関するものである。
【０００２】
【従来の技術】
従来の例えば電気カーペットような面状電気暖房器は、発熱線に流れる電流により磁界が発生していた。この流れる電流が直流の場合は一定の磁界が発生し、交流の場合はその周波数に応じて変化する磁界が発生していた。また、これらとは別に不要の高周波（電磁波ノイズ）等によっても磁界が発生していた。このようにして発生した磁界のうち周波数の高いものは、電磁ノイズとして他の電気機器に悪影響を及ぼしていた。また、低い周波数のものにおいても、最近では一部人体に悪影響を及ぼす虞れがあるといわれており、人体を暖房する電気暖房器においては非常に問題であった。
【０００３】
そこで、この対策として例えば以下に示すものが知られている（特許文献１参照）。絶縁体を介して隣接して配置された第１発熱線と第２発熱線よりなる発熱体を暖房器本体に配設し、前記発熱体の第１発熱線と第２発熱線に通電して暖房を行う電気暖房器において、暖房状態においては、前記第１発熱線に通電により発生する磁界と、前記第２発熱線に通電により発生する磁界とが互いに打ち消す方向にのみ通電されるように、前記第１発熱線と第２発熱線を、コントローラに設けた接続点を折り返し点として接続した。また、前記発熱体は第１発熱線と第２発熱線とを絶縁体を介して同心状に巻回した２層構造、又は第１発熱線と第２発熱線とを絶縁体を介して平行に配置した構造としてある。
【０００４】
しかしながら、上記従来の構造の場合、第１発熱線と第２発熱線の接続部（折り返し点）がコントローラ内にあるため、配線は本体内を周回して戻ってくる構造となる。そのため発熱面の分割構成に制限が生じ、例えば電気カーペットなどでは、できるだけ暖房面積を分割して必要な部分のみ暖房することにより、省エネルギーを可能にする機能が求められている。
【０００５】
【特許文献１】
特許第３２２９６１８号公報（請求項１、第１〜４図）
【０００６】
【発明が解決しようとする課題】
本発明は上記問題点に鑑みなされたもので、暖房器本体の発熱面を複数に分割構成し、発熱面に第１発熱線と第２発熱線を夫々直列に接続し、表生地と裏生地との間に、夫々接続部を収納する箱体を分散して設け、電気カーペットなどできるだけ暖房面積を分割して必要な部分のみ暖房することにより、省エネルギーを可能にすることができる面状電気暖房器を提供することを目的としている。
【０００７】
【課題を解決するための手段】
本発明は、上記の課題を解決するために、
絶縁体を介して隣接して配置されるとともに電流が逆方向に流れるように接続された第１発熱線と第２発熱線よりなる発熱体を暖房器本体に配設し、商用電源により前記発熱体の第１発熱線と第２発熱線に通電して暖房を行う面状電気暖房器において、
前記発熱体は温度上昇により抵抗値が変化する短絡検知線を備えており、同短絡検知線の一端をリード線と接続し、他端を制御部が収納されたコントローラ内に導引するとともに、前記暖房器本体内の表生地と裏生地との間に、内部に仕切壁を有する箱体を設け、同箱体内部に、第１発熱線と第２発熱線の接続部と短絡検知線の一端とリード線の接続部とを、前記仕切壁を挟んで収納する構成となっている。
【０００８】
また、前記箱体内に、前記発熱体および前記リード線の抜けを防止するストッパを設けてなる構成となっている。
【０００９】
また、前記箱体内に、前記発熱体および前記リード線の接続先端部の移動を規制する挟持部を設けてなる構成となっている。
【００１０】
また、前記箱体内に、絶縁性の樹脂を充填してなる構成となっている。
【００１１】
また、前記箱体を前記暖房器本体の角部に設けてなる構成となっている。
【００１７】
【発明の実施の形態】
本発明の面状電気暖房器の一実施例を電気カーペットにより図面に基づいて説明する。図１は本発明による電気カーペットの外観概略図で、図２は本発明の発熱体の拡大構造図で、図３は本発明による要部回路図である。
図１〜３において、断熱性の良い素材（例えばポリエステルのフェルト等）からなる裏生地１上に、通電により発熱する発熱体２とカーペットの温度（発熱体２の温度）を検知する感熱体３とを蛇行状に配設し、この発熱体２及び感熱体３の上からタフト生地等からなる表生地４を接着固定し、この全周縁をオーバーロック縫製してカーペット本体５を形成している。このカーペット本体５の周縁部に、前記感熱体３の検知温度によって前記発熱体２への通電量を制御する制御回路や安全保護装置等を有したコントローラ６を設け、同コントローラ６に商用電源７ａへの給電用のプラグ７が接続されている。
【００１８】
前記発熱体２は、ポリエステル等からなる芯材８に銅合金でなる第１発熱線９を螺旋状に巻回し、前記第１発熱線９をポリイミド等の耐熱絶縁体１０で被覆し、前記耐熱絶縁体１０に第１発熱線９と同様の第２発熱線１１を螺旋状に巻回し、前記第２発熱線１１を異常な温度上昇による過熱が生じた場合に融解する融解層１２で被覆し、前記融解層１２に、同融解層１２の融解により前記第２発熱線１１と短絡して安全装置を動作させる短絡検知線１３を螺旋状に巻回し、前記短絡検知線１３を耐熱塩ビ等からなる外被絶縁層１４で被覆して形成している。
【００１９】
前記第１発熱線９と前記第２発熱線１１が前記商用電源７ａに対して直列に接続されると共に、前記暖房器本体５内の表生地４と裏生地１との間に、前記第１発熱線９と前記第２発熱線１１の接続部を収納する箱体１５を設け、前記第１発熱線９と前記第２発熱線１１を互いに電流が逆方向に流れるように、前記箱体１５内の接続点１６を折り返し点として接続してなる構成となっている。
【００２０】
また、図４に示すように、前記発熱体２は前記第１発熱線９と前記第２発熱線１１とを絶縁体１０を介して平行に配置した構造としてもよい。
【００２１】
また、前記発熱体２は、前記第２発熱線１１の外周に絶縁層１２を介して、温度上昇により抵抗値が変化する短絡検知線１３を巻回し、その一端を前記箱体１５内でリード線１７と接続し、他端を制御部６ａが収納されたコントローラ６内に導引してなる構成となっている。
前記リード線１７は前記箱体１５から前記暖房器本体５内を通り、制御部６ａに帰還するが、前記短絡検知線１３は微小電圧、微小電流の回路であり電磁波の発生は極めて少なく、一般のリード線１７は前記発熱体２の線材よりも安価である。
【００２２】
また、図５および図６に示すように、前記箱体１５内に、前記発熱体２と前記リード線１７が交差しないよう仕切壁１５ａを設けると共に、前記発熱体２および前記リード線１７の抜けを防止するストッパ１５ｂを設けてなる構成となっている。
【００２３】
また、前記箱体１５内に、前記発熱体２および前記リード線１７の接続先端部の移動を規制する挟持部１５ｃを設け、前記箱体１５内に、絶縁性の樹脂を充填し、前記箱体１５を前記暖房器本体５の角部に設けてなる構成となっている。
【００２４】
さらに、前記暖房器本体５の発熱面積を複数に分割し、全体もしくは必要な部分のみ暖房可能にしてなる構成となっている。
【００２５】
以上に説明したように、前記第１発熱線９と前記第２発熱線１１が前記商用電源７ａに対して直列に接続されると共に、前記暖房器本体５内の表生地４と裏生地１との間に、前記第１発熱線９と前記第２発熱線１１の接続部を収納する箱体１５を設け、前記第１発熱線９と前記第２発熱線１１を互いに電流が逆方向に流れるように、前記箱体１５内の接続点１６を折り返し点として接続してなる構成とすることにより、電磁波の発生を防止することができる面状電気暖房器となる。
【００２６】
【発明の効果】
以上説明した本発明によれば、第１発熱線と第２発熱線が商用電源に対して直列に接続されると共に、暖房器本体内の表生地と裏生地との間に、第１発熱線と第２発熱線の接続部を収納する箱体を設け、第１発熱線と第２発熱線を互いに電流が逆方向に流れるように、箱体内の接続点を折り返し点として接続してなる構成とすることにより、電磁波の発生を防止することができる面状電気暖房器となる。
【図面の簡単な説明】
【図１】本発明における面状電気暖房器（電気カーペット）の外観概略図である。
【図２】本発明における発熱体の要部拡大図である。
【図３】本発明における面状電気暖房器の電気回路図である。
【図４】本発明における発熱体の他の実施例を示す要部拡大図である。
【図５】本発明における箱体の斜視図である。
【図６】本発明における箱体内の配線図である。
【符号の説明】
１裏生地
２発熱体
３感熱体
４表生地
５電気暖房器本体
６コントローラ
６ａ制御回路
７プラグ
８芯材
９第１発熱線
１０耐熱絶縁体
１１第２発熱線
１２融解層
１３短絡検知線
１４外被絶縁層[0001]
[Technical field to which the invention belongs]
The present invention relates to a planar electric heater such as an electric carpet, an electric blanket, and a panel heater, and more specifically, a heating element that can suppress the generation of electromagnetic waves and easily divide the heating surface of the heater body into a plurality of parts. It is related with the arrangement | positioning structure.
[0002]
[Prior art]
In a conventional sheet electric heater such as an electric carpet, a magnetic field is generated by a current flowing through a heating wire. When the flowing current is a direct current, a constant magnetic field is generated, and when the flowing current is an alternating current, a magnetic field that varies depending on the frequency is generated. Apart from these, a magnetic field is also generated by unnecessary high frequency (electromagnetic wave noise) or the like. Of the magnetic field generated in this way, a high frequency has adversely affected other electrical equipment as electromagnetic noise. Moreover, it is said that there is a possibility that some parts of the human body may be adversely affected even at a low frequency recently, and this is a problem in an electric heater for heating a human body.
[0003]
Thus, for example, the following countermeasures are known (see Patent Document 1). A heating element composed of a first heating wire and a second heating wire arranged adjacent to each other via an insulator is disposed in the heater body, and the first heating wire and the second heating wire of the heating element are energized. In the electric heater that performs heating, in the heating state, the magnetic field generated by energizing the first heating line and the magnetic field generated by energizing the second heating line are energized only in a direction that cancels each other, The first heating wire and the second heating wire were connected using a connection point provided on the controller as a turning point. Further, the heating element has a two-layer structure in which the first heating wire and the second heating wire are wound concentrically through an insulator, or the first heating wire and the second heating wire are parallel through the insulator. It is as a structure arranged in.
[0004]
However, in the case of the above conventional structure, since the connection portion (folding point) between the first heat generation line and the second heat generation line is in the controller, the wiring goes around in the main body and returns. For this reason, there is a limitation on the divided structure of the heat generating surface. For example, in an electric carpet or the like, there is a demand for a function that enables energy saving by dividing the heating area as much as possible and heating only necessary portions.
[0005]
[Patent Document 1]
Japanese Patent No. 3229618 (Claim 1, FIGS. 1 to 4)
[0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and the heating surface of the heater main body is divided into a plurality of parts, and the first heating wire and the second heating wire are connected in series to the heating surface, respectively, so that the front fabric and the back fabric are formed. Between each of the two, a box-like electric housing that stores the connecting portions is provided in a distributed manner, and a heating area such as an electric carpet is divided as much as possible to heat only the necessary portions, thereby making it possible to save energy. The purpose is to provide a vessel.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention
A heating element composed of a first heating wire and a second heating wire, which are arranged adjacent to each other through an insulator and connected so that current flows in the opposite direction, is disposed in the heater body, and the heat generation is performed by a commercial power source. In a planar electric heater for heating by energizing the first heating wire and the second heating wire of the body,
The heating element includes a short-circuit detection line whose resistance value changes as the temperature rises.One end of the short-circuit detection line is connected to the lead wire, and the other end is led into the controller in which the control unit is housed. A box having a partition wall is provided between the front fabric and the back fabric in the heater body, and a connection between the first heating wire and the second heating wire and a short-circuit detection wire are provided inside the box. One end and the connecting portion of the lead wire are stored with the partition wall interposed therebetween.
[0008]
Further, a stopper for preventing the heating element and the lead wire from coming off is provided in the box.
[0009]
Further, the box is provided with a clamping portion for restricting the movement of the connecting tip of the heating element and the lead wire.
[0010]
Further, the box is filled with an insulating resin.
[0011]
Moreover, it has the structure which provides the said box in the corner | angular part of the said heater main body.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the planar electric heater of the present invention will be described with reference to the drawings using an electric carpet. FIG. 1 is a schematic external view of an electric carpet according to the present invention, FIG. 2 is an enlarged structural view of a heating element according to the present invention, and FIG. 3 is a circuit diagram of essential parts according to the present invention.
1 to 3, on a backing fabric 1 made of a material having good heat insulation properties (for example, polyester felt), a heating element 2 that generates heat by energization and a temperature sensing element 3 that detects the temperature of the carpet (temperature of the heating element 2). Are arranged in a meandering manner, and a surface fabric 4 made of tufted fabric or the like is bonded and fixed on the heating element 2 and the heat sensitive body 3, and the entire periphery is overlock sewn to form a carpet body 5. . A controller 6 having a control circuit, a safety protection device, and the like for controlling the energization amount to the heating element 2 according to the detected temperature of the heat sensitive body 3 is provided at the peripheral edge of the carpet body 5, and the commercial power source 7a is provided in the controller 6. A power supply plug 7 is connected.
[0018]
In the heating element 2, a first heating wire 9 made of copper alloy is spirally wound around a core material 8 made of polyester or the like, and the first heating wire 9 is covered with a heat-resistant insulator 10 such as polyimide. A second heating wire 11 similar to the first heating wire 9 is spirally wound around the insulator 10, and the second heating wire 11 is covered with a molten layer 12 that melts when overheating occurs due to an abnormal temperature rise. The melting layer 12 is spirally wound with a short-circuiting detection line 13 for operating the safety device by short-circuiting the second heating wire 11 by melting the melting layer 12, and the short-circuiting detection line 13 is made of heat-resistant PVC or the like. It is formed by covering with an outer insulating layer 14.
[0019]
The first heating wire 9 and the second heating wire 11 are connected in series to the commercial power source 7a, and the first heating wire 9 and the second heating wire 11 are disposed between the front fabric 4 and the back fabric 1 in the heater body 5. A box body 15 is provided for housing the connecting portion between the heating wire 9 and the second heating wire 11, and the box body 15 is configured such that current flows through the first heating wire 9 and the second heating wire 11 in opposite directions. The connection point 16 is connected as a turning point.
[0020]
Further, as shown in FIG. 4, the heating element 2 may have a structure in which the first heating wire 9 and the second heating wire 11 are arranged in parallel via an insulator 10.
[0021]
In addition, the heating element 2 is wound around the outer periphery of the second heating wire 11 with an insulating layer 12 and a short-circuiting detection wire 13 whose resistance value changes as the temperature rises. The other end is connected to the wire 17 and the other end is led into the controller 6 in which the control unit 6a is housed.
The lead wire 17 passes through the heater body 5 from the box 15 and returns to the control unit 6a. However, the short circuit detection wire 13 is a circuit of a minute voltage and a minute current, and the generation of electromagnetic waves is very small. The lead wire 17 is less expensive than the wire rod of the heating element 2.
[0022]
Further, as shown in FIGS. 5 and 6, a partition wall 15a is provided in the box 15 so that the heating element 2 and the lead wire 17 do not intersect, and the heating element 2 and the lead wire 17 are disconnected. It is the structure which provides the stopper 15b which prevents this.
[0023]
Further, a clamping part 15c for restricting movement of the connecting tip of the heating element 2 and the lead wire 17 is provided in the box 15, and the box 15 is filled with an insulating resin, The body 15 is configured to be provided at the corner of the heater body 5.
[0024]
Furthermore, the heat generating area of the heater body 5 is divided into a plurality of parts so that the whole or only a necessary part can be heated.
[0025]
As described above, the first heating wire 9 and the second heating wire 11 are connected in series to the commercial power source 7a, and the front fabric 4 and the back fabric 1 in the heater body 5 A box 15 for accommodating the connecting portion of the first heating wire 9 and the second heating wire 11 is provided between the first heating wire 9 and the second heating wire 11, and currents flow in opposite directions to each other in the first heating wire 9 and the second heating wire 11. Thus, it becomes a planar electric heater which can prevent generation | occurrence | production of electromagnetic waves by setting it as the structure formed by connecting the connection point 16 in the said box 15 as a turning point.
[0026]
【The invention's effect】
According to the present invention described above, the first heating wire and the second heating wire are connected in series to the commercial power source, and the first heating wire is interposed between the front fabric and the back fabric in the heater body. And a box that houses the connection portion of the second heating wire, and the first heating wire and the second heating wire are connected to each other as a turning point so that current flows in the opposite direction. By doing, it becomes a planar electric heater which can prevent generation of electromagnetic waves.
[Brief description of the drawings]
FIG. 1 is a schematic external view of a planar electric heater (electric carpet) according to the present invention.
FIG. 2 is an enlarged view of a main part of a heating element in the present invention.
FIG. 3 is an electric circuit diagram of a planar electric heater according to the present invention.
FIG. 4 is an enlarged view of a main part showing another embodiment of the heating element in the present invention.
FIG. 5 is a perspective view of a box according to the present invention.
FIG. 6 is a wiring diagram inside a box according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Back fabric 2 Heat generating body 3 Heat sensitive body 4 Front fabric 5 Electric heater main body 6 Controller 6a Control circuit 7 Plug 8 Core material 9 1st heating wire 10 Heat-resistant insulator 11 2nd heating wire 12 Melting layer 13 Short-circuit detection wire 14 Outside Insulated layer

Claims

A heating element composed of a first heating wire and a second heating wire, which are arranged adjacent to each other through an insulator and connected so that current flows in the opposite direction, is disposed in the heater body, and the heat generation is performed by a commercial power source. In a planar electric heater for heating by energizing the first heating wire and the second heating wire of the body,
The heating element includes a short-circuit detection line whose resistance value changes as the temperature rises.One end of the short-circuit detection line is connected to the lead wire, and the other end is led into the controller in which the control unit is housed.
A box having a partition wall is provided between the front fabric and the back fabric in the heater body, and a connection between the first heating wire and the second heating wire and a short-circuit detection wire are provided inside the box. A planar electric heater, wherein one end and a connecting portion of a lead wire are accommodated with the partition wall interposed therebetween.

The planar electric heater according to claim 1, wherein a stopper for preventing the heating element and the lead wire from coming off is provided in the box.

The planar electric heater according to claim 1, wherein a clamping portion that restricts movement of the connecting end portion of the heating element and the lead wire is provided in the box.

Planar electric heater according to claim 1 in the box body, characterized in that formed by filling an insulating resin.

The planar electric heater according to claim 1, wherein the box is provided at a corner of the heater main body.