JPH073555Y2 - Thermal fuse - Google Patents
Thermal fuseInfo
- Publication number
- JPH073555Y2 JPH073555Y2 JP1779788U JP1779788U JPH073555Y2 JP H073555 Y2 JPH073555 Y2 JP H073555Y2 JP 1779788 U JP1779788 U JP 1779788U JP 1779788 U JP1779788 U JP 1779788U JP H073555 Y2 JPH073555 Y2 JP H073555Y2
- Authority
- JP
- Japan
- Prior art keywords
- melting point
- point metal
- low
- metal body
- low melting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008018 melting Effects 0.000 claims description 44
- 238000002844 melting Methods 0.000 claims description 44
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 230000001939 inductive effect Effects 0.000 description 5
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000006023 eutectic alloy Substances 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Landscapes
- Fuses (AREA)
Description
【考案の詳細な説明】 ＜産業上の利用分野＞ 本考案は合成型温度ヒューズの改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of a synthetic thermal fuse.
＜従来の技術＞ 合金型温度ヒューズにおいては、ヒューズエレメントに
低融点金属体を使用しており、保護すべき電気機器に接
触させて用い、当該電気機器が過電流のために異常に温
度上昇すると、温度ヒューズの低融点金属体がその温度
上昇下での受熱により溶融し、この溶融金属の球状化分
断により電気機器への通電が遮断される。<Prior Art> In an alloy type thermal fuse, a low melting point metal body is used for a fuse element, which is used in contact with an electric device to be protected, and when the electric device is abnormally heated due to overcurrent. The low-melting-point metal body of the thermal fuse is melted by receiving heat while the temperature rises, and the spheroidization of this molten metal cuts off the electric power supply to the electric equipment.
＜解決しようとする問題点＞ ところで、上記低融点金属体の溶断時にはアークの発生
があり、このアークのエネルギーのために、溶融金属が
周囲に飛散し、温度ヒューズ近傍の回路部分が酷く損傷
することがある。而して、このアークエネルギーは、電
圧にも依存し、負荷が誘導性の場合に急峻な電流変化に
より逆起電力として発生する進行波の到来（低融点金属
体の分断箇所への到来）があれば、アークエネルギーの
増大を免れ得ない。<Problems to be solved> By the way, an arc is generated when the low melting point metal body is melted, and the energy of this arc causes the molten metal to scatter to the surroundings, which seriously damages the circuit portion near the thermal fuse. Sometimes. Thus, this arc energy also depends on the voltage, and when the load is inductive, the arrival of a traveling wave (arrival at the dividing point of the low melting point metal body) generated as a counter electromotive force due to a sharp current change If so, the increase in arc energy cannot be avoided.
本考案の目的は、負荷が誘導性の場合の上記進行波障害
を確実に排除できる製作容易な温度ヒューズを提供する
ことにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an easy-to-manufacture thermal fuse that can reliably eliminate the traveling wave disturbance when the load is inductive.
＜問題点を解決するための技術的手段＞ 本考案に係る温度ヒューズは、２個の低融点金属体にお
ける一方の低融点金属体の融点を他方の低融点金属体の
融点よりもやや低くし、これらの低融点金属体を直列に
接続し、負荷側に向う方向を順方向とするダイオードを
上記一方の低融点金属体に並列に接続したことを特徴と
する構成である。<Technical Means for Solving Problems> In the thermal fuse according to the present invention, the melting point of one low melting point metal body of the two low melting point metal bodies is made slightly lower than the melting point of the other low melting point metal body. The low melting point metal body is connected in series, and the diode whose forward direction is the direction toward the load side is connected in parallel to the one low melting point metal body.
＜実施例の説明＞ 以下、図面により本考案を説明する。<Description of Embodiments> The present invention will be described below with reference to the drawings.
図において、1a,1bは互に直列に接続した２個の低融点
金属体であり、一方の低融点金属体1aの低融は他方の低
融点金属体1bの融点よりも３〜４℃低くしてある。2a,2
bは各低融点金属体上に被覆したフラックスである。３
は一方の低融点金属体1aに並列に接続したダイオードで
あり、その順方向は負荷Ｚ側に向う方向である。４は絶
縁保護体であり、熱伝導性に秀れた耐熱性絶縁物を使用
している。例えば、セメント注型物、樹脂モールド体
（例えば、常温硬化性のエポキシ樹脂）あるいはセラミ
ックスケース等を用いることができる。In the figure, 1a and 1b are two low melting point metal bodies connected in series with each other, and the low melting point of one low melting point metal body 1a is 3 to 4 ° C. lower than the melting point of the other low melting point metal body 1b. I am doing it. 2a, 2
b is a flux coated on each low melting point metal body. Three
Is a diode connected in parallel to one of the low melting point metal bodies 1a, and its forward direction is a direction toward the load Z side. Reference numeral 4 denotes an insulating protector, which uses a heat-resistant insulator having excellent thermal conductivity. For example, a cement casting, a resin molded body (for example, room temperature curable epoxy resin), a ceramic case, or the like can be used.
上記において、融点の高い方の低融点金属体1bには低融
点共晶合金を使用でき、融点のやや低い方の低融点金属
体1aには、共晶点を基準にして組成比を低融点側にやや
づらせたものを使用できる。例えば、前者には、スズ:4
2重量部、鉛:1重量部、ビスマス:57重量部、の共晶合金
（融点135,0℃）を使用でき、後者には前者に対して、
鉛量を２〜３重量部（融点132〜131℃）としたものを使
用できる。In the above, it is possible to use a low melting point eutectic alloy for the low melting point metal body 1b having a higher melting point, and for the low melting point metal body 1a having a slightly lower melting point, the composition ratio is lower than the eutectic point. You can use something that is slightly squeezed on the side. For example, for the former, tin: 4
2 parts by weight, lead: 1 part by weight, bismuth: 57 parts by weight, a eutectic alloy (melting point: 135,0 ° C) can be used.
A lead content of 2 to 3 parts by weight (melting point 132 to 131 ° C.) can be used.
上記温度ヒューズの平常時における抵抗値は、両低融点
金属体1a,1bの抵抗値の総和値以下であり、従来の合金
型温度ヒューズと同程度に低抵抗にでき、回路のインピ
ーダンス上何らの問題もない。The resistance value of the above-mentioned temperature fuse in the normal condition is equal to or less than the total value of the resistance values of both the low melting point metal bodies 1a and 1b, and the resistance can be as low as that of the conventional alloy type temperature fuse. There is no problem.
上記温度ヒューズの作動温度は融点の高い方の低融点金
属体1bの融点Tbによって定まる。而るに、一方の低融点
金属体1aの融点Taは、他方の低融点金属体1bの融点Tbよ
りも低くしてあり、周囲温度がこの融点Tbに近づくと、
温度Tbの直前温度（Ta）において一方の低融点金属体1a
が溶断する。従って、周囲温度がTbに達して、他方の低
融点金属体1bが溶断する際、この低融点金属体1bと負荷
Ｚとの間に電気的に介入したままで存在し得るものは、
ダイオード３のみであり、負荷Ｚが誘導性であって他方
の低融点金属体1bの溶断時に（回路の導通遮断時）その
誘導性負荷Ｚに逆起電力に基づく衝撃波が発生しこれが
ダイオード３に向って進行しても、この進行波に対して
ダイオード３が逆方向であるので、この進行波の他方の
低融点金属体1bへの到来を排除できる。而して、他方の
低融点金属体にその溶断時に作用す電圧を上記進行波の
波高値に起因せる電圧分だけ軽減でき、その溶断時に発
生するアークのエネルギーを充分に低減できる。Operating temperature of the thermal fuse is determined by the melting point T b of the low melting metal member 1b of higher melting point. Therefore, the melting point T a of the one low melting point metal body 1a is lower than the melting point T b of the other low melting point metal body 1b, and when the ambient temperature approaches this melting point T b ,
One of the low melting point metal bodies 1a at a temperature (T a ) immediately before the temperature T b
Will melt down. Therefore, when the ambient temperature reaches T b and the other low-melting-point metal body 1b is melt-fused, the one that can exist while electrically intervening between the low-melting-point metal body 1b and the load Z is:
Only the diode 3, the load Z is inductive, and when the other low-melting-point metal body 1b is melted (when the circuit is cut off), a shock wave based on the back electromotive force is generated in the inductive load Z, and this is generated in the diode 3. Even if the traveling wave proceeds in the opposite direction, the diode 3 is in the opposite direction with respect to this traveling wave, so that the traveling wave can be prevented from reaching the other low melting point metal body 1b. Thus, the voltage acting on the other low melting point metal body at the time of its melting can be reduced by the amount of the voltage caused by the peak value of the traveling wave, and the energy of the arc generated at the time of the melting can be sufficiently reduced.
＜考案の効果＞ 上述した通り本考案に係る温度ヒューズにおいては、負
荷が誘導性があっても、低融点金属の溶断時に発生する
アークのエネルギーを弱小にできるので、溶断時の飛散
障害をよく軽減できる。<Effects of the Invention> As described above, in the thermal fuse according to the present invention, even if the load is inductive, the energy of the arc generated when the low melting point metal is melted can be weakened, so that the scattering failure at the time of melting can be improved. Can be reduced.
図面は本考案に係る温度ヒューズを示す説明図である。 図において、1a,1bは低融点金属体、３はダイオード、
Ｚは負荷である。The drawings are explanatory views showing a thermal fuse according to the present invention. In the figure, 1a and 1b are low melting point metal bodies, 3 is a diode,
Z is the load.
Claims (1)
金属体の融点を他方の低融点金属体の融点よりもやや低
くし、これらの低融点金属体を直列に接続し、負荷側に
向う方向を順方向とするダイオードを上記一方の低融点
金属体に並列に接続したことを特徴とする温度ヒュー
ズ。1. A low-melting-point metal body of two low-melting-point metal bodies is set to have a melting point slightly lower than a melting point of the other low-melting-point metal body, and these low-melting-point metal bodies are connected in series, and a load side is provided. A thermal fuse in which a diode whose forward direction is a parallel direction is connected to the one low melting point metal body in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1779788U JPH073555Y2 (en) | 1988-02-12 | 1988-02-12 | Thermal fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1779788U JPH073555Y2 (en) | 1988-02-12 | 1988-02-12 | Thermal fuse |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01122241U JPH01122241U (en) | 1989-08-18 |
| JPH073555Y2 true JPH073555Y2 (en) | 1995-01-30 |
Family
ID=31231894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1779788U Expired - Lifetime JPH073555Y2 (en) | 1988-02-12 | 1988-02-12 | Thermal fuse |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073555Y2 (en) |
-
1988
- 1988-02-12 JP JP1779788U patent/JPH073555Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01122241U (en) | 1989-08-18 |
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