JP5247401B2 - PTC heating device - Google Patents
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- JP5247401B2 JP5247401B2 JP2008312768A JP2008312768A JP5247401B2 JP 5247401 B2 JP5247401 B2 JP 5247401B2 JP 2008312768 A JP2008312768 A JP 2008312768A JP 2008312768 A JP2008312768 A JP 2008312768A JP 5247401 B2 JP5247401 B2 JP 5247401B2
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- 238000010438 heat treatment Methods 0.000 title claims description 78
- 238000009413 insulation Methods 0.000 claims description 7
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- 229920005989 resin Polymers 0.000 claims description 6
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- 230000020169 heat generation Effects 0.000 description 9
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 239000010974 bronze Substances 0.000 description 2
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005068 transpiration Effects 0.000 description 2
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
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- 238000005476 soldering Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
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- Resistance Heating (AREA)
- Thermistors And Varistors (AREA)
Description
本発明は、例えば、保温加熱用、採暖用、凍結防止用、液体蒸散用などの目的で使用される正特性サーミスタ（以下ＰＴＣと記す）発熱装置に係り、特に、組付けが容易で、接続部の電気的接続を確実とすることができるとともに、発熱効率を高めたものに関する。 The present invention relates to a positive temperature coefficient thermistor (hereinafter referred to as PTC) heating device used for the purpose of, for example, heat insulation heating, warming, anti-freezing, liquid transpiration, etc. The present invention relates to a device that can ensure the electrical connection of the parts and increase the heat generation efficiency.
従来より、発熱体の分野において、ＰＴＣ発熱素子が利用されている。これはＰＴＣ発熱素子が低温で固有の抵抗値を持ち発熱素子として作用し、所定温度（キュリー温度）以上では急激に抵抗値が増大して通電をカットするという自己温度制御機能を有し、安全性が極めて高いからである。このような特性を有するＰＴＣ発熱素子に一対の電極端子を接続し、適宜絶縁処理を施せば、各種機器の保温加熱用ヒータ、凍結防止用ヒータなどとし好適なＰＴＣ発熱体を得ることができる。 Conventionally, PTC heating elements have been used in the field of heating elements. This has a self-temperature control function in which the PTC heating element has a specific resistance value at a low temperature and acts as a heating element, and the resistance value suddenly increases above a predetermined temperature (Curie temperature) and cuts energization. This is because the property is extremely high. If a pair of electrode terminals are connected to a PTC heating element having such characteristics and an appropriate insulation treatment is performed, a suitable PTC heating element can be obtained as a heat retaining heating heater, a freeze prevention heater, etc. for various devices.
ＰＴＣ発熱素子と電極端子を接続する構造としては、例えば、ＰＴＣ発熱素子の両電極層に導電性接着剤や半田を介して一対の電極端子を固着したもの（特許文献１参照）、絶縁ケース内にＰＴＣ発熱素子を収納し、ＰＴＣ発熱素子の両電極層とケースとの間にバネ性を有する電極端子を挿入して電極端子とＰＴＣ発熱素子とを電気的に接続したもの（特許文献２参照）などが知られている。 As a structure for connecting the PTC heating element and the electrode terminal, for example, a structure in which a pair of electrode terminals are fixed to both electrode layers of the PTC heating element via a conductive adhesive or solder (see Patent Document 1), In which a PTC heating element is housed, an electrode terminal having spring properties is inserted between both electrode layers of the PTC heating element and the case, and the electrode terminal and the PTC heating element are electrically connected (see Patent Document 2) ) Etc. are known.
しかしながら、まず、特許文献１のような導電性接着剤や半田を使用して電極端子を接続する構造のものは、ＰＴＣ発熱素子の冷熱サイクルにより、接続部に剥離やクラックが生じ、導通不良が生じることがあった。このような導通不良が生じた場合には、所望の発熱量を取り出すことができなくなり、発熱体としての機能が失われてしまうことになる。また、特許文献２のようなバネ性を有する電極端子を利用して接続する構造のものは、上述したような導電性接着剤の使用に起因した問題点は解消されるものの、一対の電極端子によってＰＴＣ発熱素子を挟み込んだだけの構成であるため、これらを使用してＰＴＣ発熱体を組み立てる際に外部から大きな衝撃を受けるようなことがあると、電極端子の位置がズレたり、電極端子とＰＴＣ発熱素子との間に僅かな隙間が生じる恐れがあった。電気的接続部が部分的となった場合には、所望の発熱量を取り出すことができなくなり、発熱体としての機能が失われてしまうことになる。また、この構造のものは、電極端子のバネ性を働かせるためにケースを必要とするため、部品点数が多くなってコストが上昇するとともに、設計の自由度が制限されてしまうという問題点もある。 However, first, in the structure in which the electrode terminals are connected using a conductive adhesive or solder as in Patent Document 1, peeling or cracks are generated in the connection portion due to the cooling / heating cycle of the PTC heating element, resulting in poor conduction. It sometimes occurred. When such a conduction failure occurs, it becomes impossible to extract a desired amount of heat generation, and the function as a heating element is lost. Moreover, the thing of the structure connected using the electrode terminal which has spring property like patent document 2, although the trouble resulting from use of the above-mentioned conductive adhesive is eliminated, a pair of electrode terminals Since the PTC heating element is simply sandwiched by the PTC heating element, when the PTC heating element is used to assemble the PTC heating element, the electrode terminal may be misaligned or There may be a slight gap between the PTC heating element and the PTC heating element. When the electrical connection portion becomes partial, a desired amount of heat generation cannot be taken out, and the function as a heating element is lost. In addition, since this structure requires a case in order to make the electrode terminal springy, the number of parts increases and the cost increases, and the degree of freedom in design is limited. .
このような問題に対するため、バネ弾性を有する金属板からなる電極端子によりＰＴＣ発熱素子を掴持する技術が知られている（特許文献３〜６参照）。 In order to deal with such a problem, a technique for gripping a PTC heating element by an electrode terminal made of a metal plate having spring elasticity is known (see Patent Documents 3 to 6).
この内、特許文献３によるＰＴＣ発熱装置は、電極端子を取り付けるためにＰＴＣ発熱素子の形状を特殊なものに加工しなければならず、その寸法精度のズレにより接続端子が容易に外れてしまう恐れがあった。また、特許文献４によるＰＴＣ発熱装置は、一対の断面コの字形上の電極端子によりＰＴＣ発熱素子を掴持しているが、電極端子の先端部分のみで掴持しているため、振動や衝撃により接続端子が容易に外れてしまう恐れがあった。また、特許文献５，６によるＰＴＣ発熱装置は、ＰＴＣ発熱素子の両主面を一対の断面コの字形上の電極端子により掴持しているが、振動や衝撃によって接続端子がずれてしまうと、一対の電極端子同士が接触してしまい、ショートしてしまう恐れがあった。 Among these, the PTC heat generating device according to Patent Document 3 has to process the shape of the PTC heat generating element into a special one in order to attach the electrode terminal, and the connection terminal may be easily detached due to the deviation of the dimensional accuracy. was there. In addition, the PTC heat generating device according to Patent Document 4 grips the PTC heat generating element by a pair of U-shaped electrode terminals. As a result, the connection terminal could easily come off. Moreover, although the PTC heat generating apparatus by patent documents 5 and 6 is holding both the main surfaces of the PTC heat generating element with a pair of U-shaped electrode terminals, if the connection terminal is displaced due to vibration or impact. The pair of electrode terminals may be in contact with each other and short-circuited.
また、特許文献３〜６のいずれのＰＴＣ発熱装置も、ＰＴＣ発熱素子に電極を広い面積でとることができないため、充分な発熱効率を得ることが困難であった。 In addition, any of the PTC heat generating devices of Patent Documents 3 to 6 cannot obtain sufficient heat generation efficiency because the PTC heat generating element cannot have electrodes in a large area.
本発明はこのような点に基づいてなされたもので、その目的とするところは、組付けが容易で、接続部の電気的接続を確実とすることができるとともに、発熱効率を高めたＰＴＣ発熱装置を提供することにある。 The present invention has been made on the basis of the above points. The object of the present invention is to facilitate the assembly, to ensure the electrical connection of the connecting portion, and to increase the heat generation efficiency. To provide an apparatus.
前記目的を達成するべく、本発明の請求項１によるＰＴＣ発熱装置は、一対の電極層を備えた正特性サーミスタ発熱素子と、第一の電極端子と、第二の電極端子と、絶縁ケースと、からなる正特性サーミスタ発熱装置において、上記第一の電極端子と上記正特性サーミスタ発熱素子が電気的に接続した状態で上記絶縁ケース内に配置され、上記第二の電極端子は、バネ弾性を有する金属板からなる断面略コの字形状のものであり、該略コの字形状の開口部によって、上記正特性サーミスタ発熱素子、上記第一の電極端子、及び、上記絶縁ケースを掴持することで、上記第二の電極端子と上記正特性サーミスタ発熱素子が電気的に接続した状態となるとともに、上記第二の電極端子と上記第一の電極端子とが絶縁ケースにより絶縁されているものである。
また、請求項２記載のＰＴＣ発熱装置は、上記絶縁ケースが、１面を開口させた箱形状であり、該絶縁ケースの底面裏側には上記第二の電極の幅とほぼ同幅の溝が形成されていることを特徴とするものである。
また、請求項３記載のＰＴＣ発熱装置は、上記第二の電極端子は、絶縁ケースの底面裏側に配される側の面が絶縁ケースの長さより長く、且つ、絶縁ケースからはみ出る部分について、上記絶縁ケースの溝よりも幅広となっていることを特徴とするものである。
また、請求項４記載のＰＴＣ発熱装置は、上記絶縁ケースが、１面を開口させた箱形状であり、上記第二の電極端子で掴持されない２面を有し、該２面の底面からの高さが、上記第一の電極端子、及び、正特性サーミスタ発熱素子のそれぞれの厚さを足した値よりも大きいことを特徴とするものである。
また、請求項５記載のＰＴＣ発熱装置は、上記第一の電極端子が、バネ弾性を有する金属板からなり、上記正特性サーミスタ発熱素子を上記第二の電極端子側に押し付けるように付勢されていることを特徴とするものである。
また、請求項６記載のＰＴＣ発熱装置は、上記第二の電極端子により上記正特性サーミスタ発熱素子、上記第一の電極端子、及び、上記絶縁ケースを掴持した状態で、これら全体を樹脂又はゴムによりモールドしたことを特徴とするものである。
In order to achieve the above object, a PTC heating device according to claim 1 of the present invention includes a positive temperature coefficient thermistor heating element including a pair of electrode layers, a first electrode terminal, a second electrode terminal, and an insulating case. In the positive temperature coefficient thermistor heating device, the first electrode terminal and the positive temperature coefficient thermistor heating element are arranged in the insulating case in an electrically connected state, and the second electrode terminal has spring elasticity. The positive thermistor heating element, the first electrode terminal, and the insulating case are held by the substantially U-shaped opening formed of a metal plate having a substantially U-shaped cross section. As a result, the second electrode terminal and the positive temperature coefficient thermistor heating element are electrically connected, and the second electrode terminal and the first electrode terminal are insulated by an insulating case. It is.
Further, in the PTC heat generating device according to claim 2, the insulating case has a box shape with one surface opened, and a groove having the same width as the width of the second electrode is formed on the bottom side of the insulating case. It is characterized by being formed.
Further, in the PTC heat generating device according to claim 3, the surface of the second electrode terminal on the back side of the bottom surface of the insulating case is longer than the length of the insulating case, and the portion protruding from the insulating case is It is characterized by being wider than the groove of the insulating case.
Further, in the PTC heat generating device according to claim 4, the insulating case has a box shape with one surface opened, and has two surfaces that are not gripped by the second electrode terminal, from the bottom surface of the two surfaces. Is higher than the sum of the thicknesses of the first electrode terminal and the positive temperature coefficient thermistor heating element.
Further, in the PTC heating device according to claim 5, the first electrode terminal is made of a metal plate having spring elasticity, and is biased so as to press the positive temperature coefficient thermistor heating element toward the second electrode terminal. It is characterized by that.
Further, in the PTC heating device according to claim 6, the positive electrode thermistor heating element, the first electrode terminal, and the insulating case are gripped by the second electrode terminal, and the whole is made of resin or It is characterized by being molded with rubber.
本発明によるＰＴＣ発熱装置によれば、第二の電極端子のコの字開口部により、ＰＴＣ発熱素子、第一の電極端子、及び、絶縁ケースがしっかりと掴持・固定されているため、振動や衝撃を受けても電極端子がずれて導通不良が生じてしまうことはない。また、ＰＴＣ発熱素子に直接導電性接着剤や半田を付けることはなく、電極端子を介しての接続になるため、ＰＴＣ発熱素子の冷熱サイクルによって導通不良が生じることもない。また、組付けも、絶縁ケース内に第一の電極端子とＰＴＣ発熱素子を配置した後に第二の電極端子を嵌め込むだけの簡単な作業とすることができる。また、ＰＴＣ発熱素子の主面全体を電極とし、対向する両主面をそれぞれ＋極、−極とすることができるので、ＰＴＣ発熱素子の発熱効率を最大限に生かした使用形態とすることができる。
特に、絶縁ケースの形状として、１面を開口させた箱形状であり、該絶縁ケースの底面裏側には第二の電極端子の幅とほぼ同幅の溝が形成されている、或いは、上記第二の電極端子で掴持されない２面を有し、該２面の底面からの高さが、上記第一の電極端子、及び、ＰＴＣ発熱素子のそれぞれの厚さを足した値よりも大きいものとすれば、振動や衝撃が加わっても、第二の電極端子が上記した絶縁ケースの溝による壁や２面の壁に当たってスライドしないので、導通不良の可能性は更に低いものとなる。更に、上記のように第二の電極端子の一部が幅広になっていれば、この部分がストッパーとなって、第二の電極端子を嵌め込んだ方向と逆方向に抜けてしまうことも防止することができる。
また、第一の電極端子が、バネ弾性を有する金属板からなり、上記ＰＴＣ発熱素子を第二の電極端子側に押し付けるように付勢されていれば、第一の電極端子も積極的にＰＴＣ発熱素子に接触することとなり、導通不良の可能性は更に低いものとなる。
また、全体を樹脂又はゴムによりモールドした構成とすれば、ＰＴＣ発熱装置として防水性を有することとなるとともに、第二の電極端子にズレが生じることによる導通不良の可能性は確実になくなる。
また、本発明によるＰＴＣ発熱装置は、ＰＴＣ発熱素子について、一方の面は第二の電極端子のみが存在するのに対し、もう一方の面には、第一の電極端子、絶縁ケース、第二の電極端子が積層されて断熱されるため、両面で発熱の温度差が生じることになる。そのため、ＰＴＣ発熱装置を被加熱体に貼り付ける際には、第二の電極端子のみが存在する面を貼り付けることで、被加熱体には強い加熱を行い、外面へは弱い加熱を行うことになるため、高効率な加熱ができるとともに、使用者が不用意に接触することによる火傷を防止することも可能である。
According to the PTC heating device of the present invention, the PTC heating element, the first electrode terminal, and the insulating case are firmly held and fixed by the U-shaped opening of the second electrode terminal. Even when subjected to an impact, the electrode terminal is not displaced and a conduction failure does not occur. In addition, the conductive adhesive or solder is not directly applied to the PTC heating element, and the connection is made through the electrode terminals, so that a conduction failure does not occur due to the cooling / heating cycle of the PTC heating element. Also, the assembly can be as simple as simply fitting the second electrode terminal after disposing the first electrode terminal and the PTC heating element in the insulating case. In addition, since the entire main surface of the PTC heating element can be used as an electrode, and both opposing main surfaces can be used as a positive electrode and a negative electrode, respectively, it is possible to use the PTC heating element so as to maximize the heat generation efficiency. it can.
In particular, the shape of the insulating case is a box shape with one surface opened, and a groove having the same width as the width of the second electrode terminal is formed on the back side of the bottom surface of the insulating case. Two surfaces that are not gripped by the two electrode terminals, and the height from the bottom surface of the two surfaces is greater than the sum of the thicknesses of the first electrode terminal and the PTC heating element. In this case, even if vibration or impact is applied, the second electrode terminal does not slide against the wall of the groove or the two surfaces of the insulating case described above, so the possibility of poor conduction is further reduced. Furthermore, if a part of the second electrode terminal is wide as described above, this part serves as a stopper to prevent the second electrode terminal from coming off in the direction opposite to the direction in which the second electrode terminal is fitted. can do.
In addition, if the first electrode terminal is made of a metal plate having spring elasticity and is urged to press the PTC heating element against the second electrode terminal side, the first electrode terminal is also positively PTC. The contact with the heating element is further reduced, and the possibility of poor conduction is further reduced.
Further, if the entire structure is molded with resin or rubber, the PTC heat generating device has waterproofness, and the possibility of poor conduction due to deviation in the second electrode terminal is reliably eliminated.
In the PTC heat generating device according to the present invention, only one second electrode terminal is present on one surface of the PTC heat generating element, whereas the first electrode terminal, the insulating case, the second electrode surface are provided on the other surface. Since the electrode terminals are laminated and insulated, a temperature difference of heat generation occurs on both sides. Therefore, when the PTC heating device is attached to the object to be heated, the surface to which only the second electrode terminal exists is attached, so that the object to be heated is heated strongly and the outer surface is weakly heated. Therefore, high-efficiency heating can be performed, and it is also possible to prevent burns due to careless contact by the user.
図１〜図７を参照して本発明のＰＴＣ発熱装置の実施の形態を説明する。 An embodiment of the PTC heating device of the present invention will be described with reference to FIGS.
第一の電極端子１は、厚さ０．２ｍｍのバネ弾性に優れたステンレス板からなり、側面から見て弧状の曲面形状となっている。そのため、平面に配して押さえつければ、それに反発するように付勢されることになる。 The first electrode terminal 1 is made of a stainless steel plate having a thickness of 0.2 mm and excellent in spring elasticity, and has an arcuate curved shape when viewed from the side. Therefore, if it is arranged on a flat surface and pressed down, it will be biased to repel it.
第二の電極端子２は、図５に示す形状となっている。厚さ０．５ｍｍのバネ弾性に優れたステンレス板により、断面コの字形状に形成されている。図５に示すように、２つの略水平面とそれらをつなぐ垂直面があり、一方の略水平面は他方より長くなっており、且つ、先端が幅広となっている。第二の電極端子２は、垂直部の高さ４．６ｍｍ、開口部先端の隙間は１．２ｍｍで設計されており、ＰＴＣ発熱素子、第一の電極、及び、絶縁ケースを掴持した際には、開口部が閉じるように付勢されることになる。尚、垂直部は厳密に垂直である必要はなく、例えば、傾きを持っていても良いし、この部分が略「く」の字状になっていても良い。 The second electrode terminal 2 has a shape shown in FIG. A stainless steel plate having a thickness of 0.5 mm and excellent spring elasticity is formed in a U-shaped cross section. As shown in FIG. 5, there are two substantially horizontal planes and a vertical plane connecting them, one of which is longer than the other, and the tip is wider. The second electrode terminal 2 is designed with a vertical portion height of 4.6 mm and an opening tip clearance of 1.2 mm. When the PTC heating element, the first electrode, and the insulating case are gripped, Is biased to close the opening. Note that the vertical portion does not need to be strictly vertical, and may have, for example, an inclination, or may have a substantially “<” shape.
第一の電極端子１や第二の電極端子２を構成する材料としては、バネ弾性を有し、かつ電極として機能するものであれば特に限定されない。例えば、ステンレス板、りん青銅板、ニッケルメッキ真鍮板、スズメッキ真鍮板、銀メッキ真鍮板などを挙げることができる。これらの中でも、ステンレス板、りん青銅板などは長期間冷熱サイクルを受けた場合にも、そのバネ弾性を充分に保持することができるため、特に好ましい。 The material constituting the first electrode terminal 1 and the second electrode terminal 2 is not particularly limited as long as it has spring elasticity and functions as an electrode. For example, a stainless plate, a phosphor bronze plate, a nickel plated brass plate, a tin plated brass plate, a silver plated brass plate, and the like can be given. Among these, stainless steel plates, phosphor bronze plates, and the like are particularly preferable because they can sufficiently retain their spring elasticity even when subjected to a long-term cooling cycle.
ＰＴＣ発熱素子３は、縦６．５ｍｍ、横１８．１ｍｍ、厚さ２．５ｍｍの角板状に形成されたチタン酸バリウム系セラミック素子からなり、相対する両主面にはそれぞれ銀ペーストからなる電極が形成されている。この電極を形成した主面の一方が＋極、もう一方が−極とされる。尚、ＰＴＣ発熱素子の材料については、必要とされる発熱特性（例えば、キュリー温度等）に応じて適宜設定すればよい。 The PTC heating element 3 is composed of a barium titanate-based ceramic element formed in a square plate shape with a length of 6.5 mm, a width of 18.1 mm, and a thickness of 2.5 mm. An electrode is formed. One of the main surfaces on which this electrode is formed is a positive pole and the other is a negative pole. In addition, what is necessary is just to set suitably about the material of a PTC heat generating element according to the heat-generating characteristic (for example, Curie temperature etc.) required.
絶縁ケース４は、ポリフェニレンサルファイド樹脂からなり、図６、７に示す形状となっている。１面を開口させた箱形状であり、絶縁ケース４の底面裏側には上記第二の電極端子２の幅とほぼ同幅の溝が形成されている。また、図６でいう長手方向の側面は、底面からの高さが３．３ｍｍであり、第一の電極端子１とＰＴＣ発熱素子３のそれぞれの厚さを足した値よりも大きくなっている。 The insulating case 4 is made of polyphenylene sulfide resin and has a shape shown in FIGS. It has a box shape with one surface opened, and a groove having the same width as the width of the second electrode terminal 2 is formed on the back side of the bottom surface of the insulating case 4. Further, the side surface in the longitudinal direction in FIG. 6 has a height from the bottom surface of 3.3 mm, which is larger than the sum of the thicknesses of the first electrode terminal 1 and the PTC heating element 3. .
これらの構成部材の組付けについて説明する。まず、絶縁ケース４内に第一の電極端子１とＰＴＣ発熱素子３を順次配置する。この状態で、第二の電極端子２の開口部を広げ、第一の電極端子１とＰＴＣ発熱素子３が配置された絶縁ケース４を第二の電極端子２の開口部に嵌め込む。すると、第二の電極端子２は、開口部を閉じる方向に付勢され、第一の電極端子１はＰＴＣ発熱素子３を第二の電極２側に押し付けるように付勢され、これらが固定保持される。これにより、第一の電極１とＰＴＣ発熱素子３の電気的接続、及び、第二の電極２とＰＴＣ発熱素子３の電気的接続が図られることになる。また、第一の電極１と第二の電極２とは、絶縁ケース４により絶縁されることになる。 The assembly of these components will be described. First, the first electrode terminal 1 and the PTC heating element 3 are sequentially arranged in the insulating case 4. In this state, the opening of the second electrode terminal 2 is widened, and the insulating case 4 in which the first electrode terminal 1 and the PTC heating element 3 are arranged is fitted into the opening of the second electrode terminal 2. Then, the second electrode terminal 2 is urged in the direction of closing the opening, and the first electrode terminal 1 is urged so as to press the PTC heating element 3 toward the second electrode 2, and these are fixedly held. Is done. Thereby, the electrical connection between the first electrode 1 and the PTC heating element 3 and the electrical connection between the second electrode 2 and the PTC heating element 3 are achieved. Further, the first electrode 1 and the second electrode 2 are insulated by the insulating case 4.
ここで、絶縁ケース４の底面裏側には第二の電極２の幅とほぼ同幅の溝が形成されており、この溝に第二の電極端子２が嵌め込まれた状態となっている。また、絶縁ケース４の開口した面においても、上記したように、絶縁ケース４の長手方向の側面は、底面からの高さが、第一の電極端子１、及び、ＰＴＣ発熱素子３のそれぞれの厚さを足した値よりも大きく、この絶縁ケース４の長手方向の側面間に第二の電極端子２が嵌め込まれた状態となる。そのため、第二の電極端子２が上記した絶縁ケース４の溝による壁や長手方向の側面に当たって横ズレしないので、導通不良の可能性は更に低いものとなる。 Here, a groove having substantially the same width as the width of the second electrode 2 is formed on the back side of the bottom surface of the insulating case 4, and the second electrode terminal 2 is fitted in this groove. In addition, as described above, the side surface in the longitudinal direction of the insulating case 4 on the opened surface of the insulating case 4 has a height from the bottom surface of each of the first electrode terminal 1 and the PTC heating element 3. It is larger than the value obtained by adding the thickness, and the second electrode terminal 2 is fitted between the longitudinal side surfaces of the insulating case 4. Therefore, since the second electrode terminal 2 hits against the wall or longitudinal side surface of the groove of the insulating case 4 described above and does not shift laterally, the possibility of poor conduction is further reduced.
また、第二の電極端子２は、絶縁ケース４の底面裏側に配される側の面が絶縁ケース４の長さより長く、且つ、上記したように、絶縁ケース４からはみ出る部分について、上記絶縁ケース４の溝よりも幅広となっている。そのため、この幅広の部分が絶縁ケース４の底面に形成された溝の壁の端に当たり、ストッパーとなることから、第二の電極端子２を嵌め込んだ方向と逆方向に抜けてしまうことも防止することができる。 Further, the second electrode terminal 2 has a surface on the back side of the bottom surface of the insulating case 4 longer than the length of the insulating case 4 and, as described above, the portion protruding from the insulating case 4 is the above insulating case. It is wider than 4 grooves. Therefore, since this wide part hits the end of the wall of the groove formed on the bottom surface of the insulating case 4 and becomes a stopper, it is possible to prevent the second electrode terminal 2 from coming off in the direction opposite to the direction in which the second electrode terminal 2 is fitted. can do.
また、上記のように本発明によるＰＴＣ発熱装置は、一方の面は第二の電極端子２のみが存在するのに対し、もう一方の面には、第一の電極端子１、絶縁ケース３、第二の電極端子２が積層されて断熱されるため、両面で発熱の温度差が生じることになる。ここで、絶縁ケース４の底面の厚さを変更する、絶縁ケース４の底面に穴を設ける、絶縁ケース４の材料について熱伝導率の異なる材料に変更する、といったことにより、両面での発熱の温度差を適宜設定することも考えられる。 Further, as described above, the PTC heat generating device according to the present invention has only the second electrode terminal 2 on one side, whereas the first electrode terminal 1, the insulating case 3, Since the second electrode terminal 2 is laminated and insulated, a temperature difference of heat generation occurs on both sides. Here, by changing the thickness of the bottom surface of the insulating case 4, providing a hole in the bottom surface of the insulating case 4, and changing the material of the insulating case 4 to a material having a different thermal conductivity, It is also conceivable to set the temperature difference as appropriate.
第一の電極１に接続されるリード線６、第二の電極端子２に接続されるリード線７については、半田付け、溶接、端子打ちなど、適宜に接続すればよい。作業の容易さから、当初の段階でリード線６，７を接続し、その後に各部材の組付けをした方が好ましい。 The lead wire 6 connected to the first electrode 1 and the lead wire 7 connected to the second electrode terminal 2 may be appropriately connected by soldering, welding, terminal punching, or the like. From the viewpoint of ease of work, it is preferable to connect the lead wires 6 and 7 in the initial stage, and then assemble each member.
このようにして第一の電極端子１、ＰＴＣ発熱素子３、絶縁ケース４、及び、第二の電極端子２の組付けをした後、これら全体について、樹脂又はゴムによりモールド５をしても良い。こうすることにより、ＰＴＣ発熱装置として防水性を有することとなるとともに、第二の電極端子２にズレが生じることによる導通不良の可能性は確実になくなる。また、モールドにより、外部からの衝撃を弾力的に吸収することもできる。モールド５に使用される樹脂又はゴムとしては一般的なものを適宜に使用すればよいが、柔軟で耐熱性に優れるシリコーンゴムを使用することが好ましい。 After assembling the first electrode terminal 1, the PTC heating element 3, the insulating case 4, and the second electrode terminal 2 in this way, the mold 5 may be molded with resin or rubber for all of them. . By doing so, the PTC heat generating device is waterproof, and the possibility of poor conduction due to the occurrence of misalignment in the second electrode terminal 2 is reliably eliminated. Also, the impact from the outside can be elastically absorbed by the mold. As the resin or rubber used for the mold 5, a general one may be used as appropriate, but it is preferable to use a silicone rubber that is flexible and excellent in heat resistance.
このようにして得られたＰＴＣ発熱装置１０について、温度測定を行った。図２に示すように、第二の電極端子２のみが存在する面の中心部をＡ点、第一の電極端子１、絶縁ケース４、第二の電極端子２が積層された面の中心部をＢ点とし、両方の点での温度差を検証した。資料数を４としてその平均値を算出し、結果を表１に示す。 The PTC heating device 10 obtained in this way was measured for temperature. As shown in FIG. 2, the center of the surface where only the second electrode terminal 2 is present is the point A, and the center of the surface where the first electrode terminal 1, the insulating case 4, and the second electrode terminal 2 are stacked. Was the point B, and the temperature difference at both points was verified. The average value was calculated by setting the number of materials to 4, and the results are shown in Table 1.
表１に示すように、本発明のＰＴＣ発熱装置は、一方の面ともう一方の面で温度差を有するものであることが確認された。 As shown in Table 1, it was confirmed that the PTC heat generating device of the present invention has a temperature difference between one surface and the other surface.
以上詳述したように本発明によれば、組付けが容易で、接続部の電気的接続を確実とすることができるとともに、発熱効率を高めたＰＴＣ発熱装置を提供することができる。このようなＰＴＣ発熱装置は、例えば、家電製品、住宅設備、自動車機関部、プラント、配管などの保温加熱用、採暖用、凍結防止用ヒータとして、また、芳香剤などの液体蒸散用のヒータとして好適に使用することができる。 As described above in detail, according to the present invention, it is possible to provide a PTC heat generating device that is easy to assemble, can ensure electrical connection of the connecting portion, and has improved heat generation efficiency. Such a PTC heating device is used as a heater for heat insulation and heating, anti-freezing, etc. for home appliances, housing equipment, automobile engine parts, plants, piping, etc., and as a heater for liquid transpiration such as fragrance. It can be preferably used.
１ 第一の電極端子
２ 第二の電極端子
３ ＰＴＣ発熱素子
４ 絶縁ケース
５ モールド
６，７ リード線
１０ ＰＴＣ発熱装置
DESCRIPTION OF SYMBOLS 1 1st electrode terminal 2 2nd electrode terminal 3 PTC heat generating element 4 Insulation case 5 Mold 6, 7 Lead wire 10 PTC heat generating apparatus
Claims (6)
上記第一の電極端子と上記正特性サーミスタ発熱素子が電気的に接続した状態で上記絶縁ケース内に配置され、
上記第二の電極端子は、バネ弾性を有する金属板からなる断面略コの字形状のものであり、該略コの字形状の開口部によって、上記正特性サーミスタ発熱素子、上記第一の電極端子、及び、上記絶縁ケースを掴持することで、上記第二の電極端子と上記正特性サーミスタ発熱素子が電気的に接続した状態となるとともに、上記第二の電極端子と上記第一の電極端子とが絶縁ケースにより絶縁されている正特性サーミスタ発熱装置。 In a positive temperature coefficient thermistor heating device comprising a positive temperature coefficient thermistor heating element having a pair of electrode layers, a first electrode terminal, a second electrode terminal, and an insulating case,
The first electrode terminal and the positive temperature coefficient thermistor heating element are arranged in the insulating case in an electrically connected state,
The second electrode terminal has a substantially U-shaped cross section made of a metal plate having spring elasticity, and the positive temperature coefficient thermistor heating element and the first electrode are formed by the substantially U-shaped opening. By holding the terminal and the insulating case, the second electrode terminal and the positive temperature coefficient thermistor heating element are electrically connected, and the second electrode terminal and the first electrode A positive temperature coefficient thermistor heating device that is insulated from the terminal by an insulation case
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