JPH0536344A - Fuse - Google Patents
FuseInfo
- Publication number
- JPH0536344A JPH0536344A JP3188796A JP18879691A JPH0536344A JP H0536344 A JPH0536344 A JP H0536344A JP 3188796 A JP3188796 A JP 3188796A JP 18879691 A JP18879691 A JP 18879691A JP H0536344 A JPH0536344 A JP H0536344A
- Authority
- JP
- Japan
- Prior art keywords
- metal wire
- envelope
- metal
- fuse
- terminals
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/18—Casing fillings, e.g. powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/0078—Security-related arrangements
- H01H85/0082—Security-related arrangements preventing explosion of the cartridge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/044—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified
- H01H85/045—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type
- H01H85/0456—General constructions or structure of low voltage fuses, i.e. below 1000 V, or of fuses where the applicable voltage is not specified cartridge type with knife-blade end contacts
Landscapes
- Fuses (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、電子部品、電子機器な
どを過電流から保護するための保護素子となるヒューズ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuse serving as a protection element for protecting electronic parts, electronic equipment, etc. from overcurrent.
【0002】[0002]
【従来の技術】一般にヒューズの保護機能は、可溶体で
ある金属線に過電流が流れると、そのジュール熱により
金属線が融点に達し溶融気化することにより電流路を断
つことによって行われる。2. Description of the Related Art In general, a fuse protecting function is performed by cutting an electric current path by melting and vaporizing a metal wire by its Joule heat when an overcurrent flows through the metal wire which is a fusible body.
【0003】また、可溶体である金属線の溶断時には金
属が気化することによりこの金属線を収納した外囲器の
内部の圧力が上昇するという現象を伴う。Further, when the metal wire, which is a fusible body, is melted, the metal vaporizes, so that the pressure inside the envelope accommodating the metal wire rises.
【0004】単なる過負荷電流保護という点から見る
と、可溶体である金属線の最も熱放散の行われにくい箇
所である中央部のわずかな部分が溶融気化することでヒ
ューズの保護機能は完了するが、回路短絡で流れる大き
な電流は可溶体である金属線を一様に加熱溶融させて、
さらに溶融後急激に金属線を気化させる。From the point of view of merely overload current protection, the fuse protection function is completed by melting and vaporizing a small portion of the central portion of the metal wire, which is a fusible body, where heat dissipation is least likely to occur. However, a large current flowing due to a short circuit causes the metal wire, which is a fusible material, to be uniformly heated and melted,
Further, after melting, the metal wire is vaporized rapidly.
【0005】このように、短絡電流による溶断では、瞬
間的に大きな熱エネルギーが発生し、内部圧力の上昇も
大きくなる。As described above, in the fusing by the short-circuit current, a large amount of heat energy is generated instantaneously, and the internal pressure also increases.
【0006】このような内部圧力の上昇は、外囲器にと
って機械的負荷となり最悪の場合は外囲器破損などの異
常事態が生じることとなる。[0006] Such an increase in internal pressure causes a mechanical load on the envelope, and in the worst case, an abnormal situation such as damage to the envelope occurs.
【0007】従来はこのようなヒューズの短絡遮断性能
を確保するために、図7に示すように、金属線1の金属
量を考慮して外囲器2内に空間3を設け、この金属線1
の両端に接続した端子4,4を外囲器2の外部に導出し
た構造が採られている。In order to secure the short-circuit breaking performance of such a fuse, conventionally, as shown in FIG. 7, a space 3 is provided in the envelope 2 in consideration of the metal amount of the metal wire 1, and this metal wire is provided. 1
A structure is adopted in which the terminals 4 and 4 connected to both ends of the enclosure are led out of the envelope 2.
【0008】しかしながら、近年急速に電子部品の小形
化が進み、ヒューズにおいてもその要求が高まるにつ
れ、外囲器2内に単なる空間部3を形成するのみで短絡
遮断性能を確保するとともに、外囲器2の破壊を防止す
るようにした構造では、小形化の要請に応じることが困
難となっている。However, with the recent rapid downsizing of electronic components and the increasing demand for fuses, short-circuit breaking performance is ensured by simply forming a space 3 inside the envelope 2 and at the same time, It is difficult to meet the demand for downsizing with a structure that prevents the vessel 2 from being destroyed.
【0009】そこで、例えば、実公昭58ー38988
号公報に記載されているように、柔軟性を有する合成樹
脂にて可溶性金属線を覆い、空間部の機能を柔軟性の樹
脂に代替した構造のヒューズが知られている。Then, for example, Jitsuko Sho 58-38988.
As described in Japanese Patent Publication No. JP-A-2003-264, there is known a fuse having a structure in which a fusible metal wire is covered with a flexible synthetic resin and the function of the space portion is replaced with a flexible resin.
【0010】[0010]
【発明が解決しようとする課題】しかしながら、上記従
来の柔軟性を有する合成樹脂にて可溶性金属線を被覆し
た構造のヒューズでは、外囲器の機械的負荷に耐えて充
分な短絡遮断性能を確保することはできない問題を有し
ている。However, in the fuse having the structure in which the fusible metal wire is covered with the conventional synthetic resin having flexibility, the fuse having a mechanical load of the envelope can withstand a sufficient short circuit breaking performance. There is a problem that cannot be done.
【0011】そこで、発明者は図8に示すように、外囲
器2内に収納された可溶性の金属線1をさらに箱状に囲
い枠5で覆うことにより第2の空間部6を形成すること
により、金属線1が溶融気化すると、第2の空間部6内
の圧力が上昇し、その圧力により囲い枠5が耐えられな
くひび、割れなどの破損に至っても、その間に熱エネル
ギーが消散され、外囲器2を破損に至らすに必要なエネ
ルギーが消費され、外囲器2に掛かる負荷が低減される
ことに着目して発明されたものである。Therefore, as shown in FIG. 8, the inventor further forms the second space 6 by covering the fusible metal wire 1 housed in the envelope 2 with a box-like enclosure frame 5. As a result, when the metal wire 1 is melted and vaporized, the pressure in the second space 6 rises, and even if the enclosure frame 5 cannot withstand the pressure and is damaged by cracks, cracks, etc., the heat energy is dissipated during that time. The energy required to damage the envelope 2 is consumed, and the load applied to the envelope 2 is reduced.
【0012】本発明は、短絡遮断時に発生した熱エネル
ギーを外囲器の破損に至る前に確実に消散させ、外囲器
の空間部をより有効に活用して大幅な短絡遮断性能の向
上を図ることのできるヒューズを提供するものである。The present invention surely dissipates the heat energy generated at the time of short-circuit interruption before the damage to the envelope, and makes more effective use of the space of the envelope to greatly improve the short-circuit interruption performance. A fuse that can be designed is provided.
【0013】[0013]
【課題を解決するための手段】本発明のヒューズは、図
1に示すように、一対の金属端子11,11間に可溶体であ
る金属線12を張設し、前記金属端子11,11の各外端が外
側に導出されるようにこの金属線12および金属線12と前
記端子11,11との接続部を絶縁材料からなる外囲器13内
に収納したヒューズ14において、前記金属線12の回りを
発泡性の樹脂15で覆ったものである。As shown in FIG. 1, in a fuse of the present invention, a metal wire 12, which is a fusible body, is stretched between a pair of metal terminals 11 and 11, and the metal terminals 11 and 11 are In the fuse 14 in which the metal wire 12 and the connecting portion between the metal wire 12 and the terminals 11 and 11 are housed in the envelope 13 made of an insulating material so that each outer end is led out to the outside, the metal wire 12 The area around is covered with a foamable resin 15.
【0014】[0014]
【作用】本発明のヒューズは、可溶体である金属線12の
回りを発泡性の樹脂15で覆ったため、金属線12の回りは
発泡性の樹脂15にて無数に区切られた空間が形成される
ことになり、可溶性の金属線12が溶融気化したとき、無
数に区切られた空間部内の圧力が上昇して、各区切られ
た空間を形成する部分の一部が破損に至っても、その間
に熱エネルギーが消散され、外囲器13を破損に至らすに
必要なエネルギーが消費され、外囲器13に掛かる負荷が
低減され、外囲器13が破損されることがなく、充分な短
絡遮断性能が確保できる。In the fuse of the present invention, since the metal wire 12 which is a fusible body is covered with the foaming resin 15, the metal wire 12 is surrounded by an infinite number of spaces formed by the foaming resin 15. That is, when the soluble metal wire 12 is melted and vaporized, the pressure in the infinitely divided space portion rises, and even if a part of the portion forming each divided space is damaged, in the meantime. Thermal energy is dissipated, the energy required to damage the envelope 13 is consumed, the load on the envelope 13 is reduced, the envelope 13 is not damaged, and sufficient short-circuit cutoff is performed. Performance can be secured.
【0015】[0015]
【実施例】本発明の一実施例の構成を図2および図3に
ついて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the present invention will be described with reference to FIGS.
【0016】20は可溶体である金属線で、この金属線20
は一対の金属端子21,21間に張設されている。そして、
前記金属端子21,21の各外端を外側に導出させて金属線
20を絶縁材料、例えば、ポリエーテルサルフォンにて成
型した外囲器22の開口部23からこの外囲器22内に収納す
る。そして、この外囲器22の開口部23から発泡性の樹脂
24、例えば、信越化学工業株式会社製KE521(A・
B)を流し込み、金属線20および金属線20と前記端子2
1,21との接続部の回りを発泡性の樹脂24で覆う。Reference numeral 20 denotes a metal wire which is a fusible material.
Is stretched between a pair of metal terminals 21, 21. And
The outer ends of the metal terminals 21 and 21 are led out to the outside to form a metal wire.
20 is housed in the envelope 22 through the opening 23 of the envelope 22 formed of an insulating material, for example, polyether sulfone. From the opening 23 of the envelope 22, a foamable resin
24, for example, Shin-Etsu Chemical Co., Ltd. KE521 (A.
B) is poured, the metal wire 20 and the metal wire 20 and the terminal 2
The area around the connection with 1, 21 is covered with a foaming resin 24.
【0017】また、発泡性樹脂24を充填して外囲器22の
開口部23を絶縁性を有する樹脂、例えば、ポリエチレン
テレフタレートにて成型した蓋体25で覆う。Further, a foaming resin 24 is filled and the opening 23 of the envelope 22 is covered with a lid 25 formed of an insulating resin, for example, polyethylene terephthalate.
【0018】次にこの実施例の作用を説明する。Next, the operation of this embodiment will be described.
【0019】可溶体である金属線21の回りを発泡性の樹
脂24で覆ったため、金属線21の回りは発泡性の樹脂24に
て無数に区切られた空間が形成されることになり、可溶
性の金属線21が溶融気化したとき、無数に区切られた空
間部内の圧力が上昇して、各区切られた空間を形成する
部分の一部が破損に至っても、その間に熱エネルギーが
消散され、外囲器22を破損に至らすに必要なエネルギー
が消費される。したがって、外囲器22に掛かる負荷が低
減され、外囲器22が破損されることがない。Since the metal wire 21 which is a fusible body is covered with the foaming resin 24, a space innumerable divided by the foaming resin 24 is formed around the metal wire 21. When the metal wire 21 of is melted and vaporized, the pressure in the innumerable divided space portion rises, and even if a part of the portion forming each divided space is damaged, thermal energy is dissipated during that time, Energy required to damage the envelope 22 is consumed. Therefore, the load on the envelope 22 is reduced and the envelope 22 is not damaged.
【0020】次に本発明の効果を定性的に表すために比
較実験した結果について説明する。サンプルAは前記実
施例に示す構成で図4に示す。また、サンプルBは図5
に示すように、外囲器30に金属端子31を両端に接続して
収納した可溶性金属線32の周囲に空間部33を形成した従
来の構造である。さらに、サンプルCは図6に示すよう
に、外囲器35に金属端子36を両端に接続して収納した可
溶性金属線37の周囲を柔軟性の樹脂38(信越化学工業株
式会社製シリコーンワニスKRー2038)で覆った構
造である。Next, the results of comparative experiments will be described in order to qualitatively express the effects of the present invention. Sample A has the structure shown in the above embodiment and is shown in FIG. Sample B is shown in FIG.
As shown in FIG. 3, the conventional structure has the space portion 33 formed around the fusible metal wire 32 in which the metal terminals 31 are connected to both ends of the envelope 30 and accommodated therein. Further, in the sample C, as shown in FIG. 6, a flexible resin 38 (silicone varnish KR manufactured by Shin-Etsu Chemical Co., Ltd.) is used around the soluble metal wire 37 which is housed in the envelope 35 with the metal terminals 36 connected to both ends. -2038).
【0021】そして、この各サンプルA〜Cに直流電流
を130ボルト、50アンペア、時定数1.3ミリ秒の
規約条件にて短絡遮断試験を行った結果、次の表1に示
す結果が得られた。A short circuit interruption test was conducted on each of the samples A to C under a standard condition of a direct current of 130 V, 50 amperes and a time constant of 1.3 milliseconds, and the results shown in Table 1 below were obtained. Was given.
【0022】[0022]
【表1】 [Table 1]
【0023】表1中の○印は問題なく電流を遮断したも
のであり、×印は電流を遮断できなかったか、外囲器に
ひび、割れなどの異常が観察されたものである。In Table 1, the mark "O" indicates that the current was cut off without any problem, and the mark "X" indicates that the current could not be cut off, or that the envelope had abnormalities such as cracks or cracks.
【0024】この実験の結果、金属線を発泡樹脂で覆っ
たサンプルAのヒューズは全て問題なく電流を遮断し、
本発明のヒューズが優れた性能を有することが確認され
た。また、金属線の周囲に空間部を形成したサンプルB
のヒューズは全て端子間のアークを消弧できず、外囲器
が破壊された。さらに、金属線の周囲を柔軟性の樹脂で
覆ったヒューズでは3/5個は外囲器にひび、割れなど
の異常が観察された。また、前記実施例では、可溶性金
属線を発泡樹脂で覆った構造について説明したが、例え
ば、発泡性樹脂に柔軟性樹脂を組合わせることもでき
る。また、発泡性樹脂に消弧材などのフィラーを発泡性
樹脂に分散させて外囲器を破損することなく短絡遮断性
能を向上させることもできる。As a result of this experiment, all the fuses of Sample A in which the metal wire was covered with the foamed resin cut off the current without any problem,
It was confirmed that the fuse of the present invention has excellent performance. In addition, sample B in which a space is formed around the metal wire
All fuses could not extinguish the arc between the terminals, and the envelope was destroyed. Furthermore, in the case of a fuse in which the metal wire was covered with a flexible resin, 3/5 of the fuses were found to have abnormalities such as cracks and cracks in the envelope. Further, in the above-described embodiment, the structure in which the soluble metal wire is covered with the foamed resin has been described, but it is also possible to combine the foamable resin with the flexible resin. Further, a filler such as an arc extinguishing material may be dispersed in the foamable resin to improve the short circuit breaking performance without damaging the envelope.
【0025】さらに、前記実施例では、箱状の外囲器に
発泡性樹脂を流入したが、この方法に限られるものでは
なく、例えば、可溶性金属線の回りを注型などの成型に
より発泡樹脂で覆うこともでき、また、外囲器を注型成
型し、さらには、低圧のトランスファー成型などによっ
て製造することもできる。Further, in the above-mentioned embodiment, the foamable resin is flown into the box-shaped envelope, but the invention is not limited to this method. For example, the foamable resin is molded around the soluble metal wire by casting or the like. Alternatively, the envelope may be cast, and further manufactured by low-pressure transfer molding or the like.
【0026】[0026]
【発明の効果】本発明によれば、可溶性金属線の回りを
発泡性樹脂で覆ったので、簡単な構造で金属線の溶融気
化で外囲器内の圧力が上昇しても外囲器がひび、割れが
生じることなく、短絡遮断性能を向上できる。According to the present invention, since the fusible metal wire is covered with the foaming resin, even if the pressure inside the envelope rises due to the vaporization of the metal wire with a simple structure, the envelope does not Short-circuit breaking performance can be improved without cracking or cracking.
【図1】本発明のヒューズの説明図である。FIG. 1 is an explanatory diagram of a fuse of the present invention.
【図2】aは本発明の一実施例を示すヒューズの分解正
面図、bは分解側面図である。FIG. 2A is an exploded front view of a fuse showing one embodiment of the present invention, and b is an exploded side view.
【図3】同上蓋体を外した状態の縦断面図である。FIG. 3 is a vertical cross-sectional view showing a state in which the upper lid is removed.
【図4】同上縦断面図である。FIG. 4 is a vertical sectional view of the same.
【図5】従来のヒューズの縦断面図である。FIG. 5 is a vertical sectional view of a conventional fuse.
【図6】従来の他のヒューズの縦断面図である。FIG. 6 is a vertical cross-sectional view of another conventional fuse.
【図7】従来のヒューズの説明図である。FIG. 7 is an explanatory diagram of a conventional fuse.
【図8】本発明の前提となるヒューズの説明図である。FIG. 8 is an explanatory diagram of a fuse which is a premise of the present invention.
11 金属端子 12 金属線 13 外囲器 15 樹脂 11 Metal terminal 12 Metal wire 13 Enclosure 15 Resin
Claims (1)
を張設し、前記金属端子の各外端が外側に導出されるよ
うにこの金属線および金属線と前記端子との接続部を絶
縁材料からなる外囲器内に収納したヒューズにおいて、 前記金属線の回りを発泡性の樹脂で覆ったことを特徴と
したヒューズ。Claim: What is claimed is: 1. A metal wire, which is a fusible body, is stretched between a pair of metal terminals, and the metal wire and the metal wire are arranged so that each outer end of the metal terminal is led out to the outside. A fuse in which a connecting portion with the terminal is housed in an envelope made of an insulating material, wherein the metal wire is covered with a foaming resin.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3188796A JPH0536344A (en) | 1991-07-29 | 1991-07-29 | Fuse |
EP19920306533 EP0526050A3 (en) | 1991-07-29 | 1992-07-16 | Fuse |
US08/135,064 US5420560A (en) | 1991-07-29 | 1993-10-12 | Fuse |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3188796A JPH0536344A (en) | 1991-07-29 | 1991-07-29 | Fuse |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0536344A true JPH0536344A (en) | 1993-02-12 |
Family
ID=16229954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3188796A Pending JPH0536344A (en) | 1991-07-29 | 1991-07-29 | Fuse |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0526050A3 (en) |
JP (1) | JPH0536344A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2706625B2 (en) * | 1994-10-03 | 1998-01-28 | エス・オー・シー株式会社 | Micro chip fuse |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1203861A (en) * | 1968-05-23 | 1970-09-03 | Reyrolle A & Co Ltd | Improvements relating to low-voltage electric fuses |
JPS6142834A (en) * | 1984-08-06 | 1986-03-01 | 株式会社 エス・ケ−・ケ− | Fuse unit |
GB8519601D0 (en) * | 1985-08-05 | 1985-09-11 | Dubilier Plc | Time-lag fuses |
GB8717579D0 (en) * | 1987-07-24 | 1987-09-03 | Gen Electric Co Plc | Protective electric fuses |
-
1991
- 1991-07-29 JP JP3188796A patent/JPH0536344A/en active Pending
-
1992
- 1992-07-16 EP EP19920306533 patent/EP0526050A3/en not_active Ceased
Also Published As
Publication number | Publication date |
---|---|
EP0526050A2 (en) | 1993-02-03 |
EP0526050A3 (en) | 1993-08-25 |
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