JP2011003350A - Current fuse - Google Patents
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- JP2011003350A JP2011003350A JP2009144201A JP2009144201A JP2011003350A JP 2011003350 A JP2011003350 A JP 2011003350A JP 2009144201 A JP2009144201 A JP 2009144201A JP 2009144201 A JP2009144201 A JP 2009144201A JP 2011003350 A JP2011003350 A JP 2011003350A
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本発明は、一対の端子間に張設された可溶体に低融点合金が溶着された電流ヒューズに関する。 The present invention relates to a current fuse in which a low melting point alloy is welded to a fusible member stretched between a pair of terminals.
従来、サージ保護デバイス（Surge Protective Device、以下ＳＰＤという）が故障して故障電流が流れた場合には、このＳＰＤを電源回路から切離す必要があり、ＳＰＤを電源回路から切離す方法として、ＳＰＤと電源回路との間に電流ヒューズを直列に接続する方法が一般的に用いられている。 Conventionally, when a surge protection device (hereinafter referred to as SPD) fails and a fault current flows, it is necessary to disconnect the SPD from the power supply circuit. As a method of disconnecting the SPD from the power supply circuit, the SPD In general, a method of connecting a current fuse in series between the power supply circuit and the power supply circuit is used.
これらを目的とした電流ヒューズは、ＳＰＤの雷サージ吸収能力を最大限に発揮するために、電流ヒューズの可溶体のサージ電流耐量を十分に大きくし、且つ、ＳＰＤが故障し故障電流が流れた際に速やかにＳＰＤを電源回路から切離すため、可溶体のジュール積分値（すなわち溶断電流二乗時間積、以下、溶断I２tという）及び最小溶断電流を小さくする必要がある。 For current fuses for these purposes, in order to maximize the lightning surge absorption capability of the SPD, the surge current tolerance of the fusible body of the current fuse was sufficiently increased, and the SPD failed and a fault current flowed. In order to quickly disconnect the SPD from the power supply circuit, it is necessary to reduce the joule integral value (that is, the fusing current square time product, hereinafter referred to as fusing I 2 t) and the minimum fusing current of the fusible body.
サージ電流耐量を大きくするには、一般に可溶体の断面積を大きくすることが有効であるが、可溶体の断面積を大きくするに伴い、可溶体の溶断I２t及び最小溶断電流が大きくなってしまう欠点がある。 In order to increase the surge current tolerance, it is generally effective to increase the cross-sectional area of the fusible body. However, as the cross-sectional area of the fusible body is increased, the fusing I 2 t and the minimum fusing current of the fusible body increase. There is a drawback.
そこで、最小溶断電流を下げる方法として、可溶体を支持体に螺旋状に巻付けて可溶体の線長を長くすることで、一対の端子間に張設した可溶体の電気抵抗を高くして、小さな電流で可溶体の溶融温度に達するジュール熱を得る方法（例えば、特許文献１参照）や、可溶体の中央部に低融点合金を溶着させ、溶融した低融点合金と可溶体の間で進む相互拡散に伴う可溶体の電気抵抗の増加を利用して、小さな電流で可溶体の溶融温度に達するジュール熱を得る方法（例えば、特許文献２参照）が、知られている。 Therefore, as a method of lowering the minimum fusing current, the fusible body is wound around the support in a spiral shape to increase the wire length of the fusible body, thereby increasing the electric resistance of the fusible body stretched between the pair of terminals. A method of obtaining Joule heat that reaches the melting temperature of the fusible body with a small current (see, for example, Patent Document 1), or a low melting point alloy is welded to the center of the fusible body, and between the melted low melting point alloy and the fusible body A method of obtaining Joule heat that reaches the melting temperature of a soluble material with a small current by utilizing an increase in electrical resistance of the soluble material accompanying the progressing interdiffusion (see, for example, Patent Document 2) is known.
しかしながら、特許文献１に記載の従来のヒューズにおいて、サージ電流が可溶体に印加されると、螺旋状の可溶体は、ピンチ効果により機械的ストレスが加わるため、一対の端子間に可溶体を直線状に張設した場合に比べサージ電流耐量が低下し、所望のサージ電流耐量が得られない。 However, in the conventional fuse described in Patent Document 1, when a surge current is applied to the fusible body, the helical fusible body is subjected to mechanical stress due to the pinch effect. As compared with the case where it is stretched in the shape, the surge current withstand capability is lowered, and the desired surge current withstand capability cannot be obtained.
所望のサージ電流耐量を得るためには、可溶体の断面積を大きくする必要があるが、可溶体の断面積を大きくした場合は、溶断I２tが大きくなり、比較的大きな故障電流が流れた場合に速やかにＳＰＤを電源回路から切離せないと共に、可溶体の電気抵抗が小さくなるため、可溶体を螺旋状にしても一対の端子間の電気抵抗を十分に下げられず、最小溶断電流が大きくなり、比較的小さな故障電流が流れた場合も速やかにＳＰＤを電源回路から切離せない問題がある。 In order to obtain a desired surge current tolerance, it is necessary to increase the cross-sectional area of the fusible body. However, if the cross-sectional area of the fusible body is increased, the fusing I 2 t increases and a relatively large fault current flows. In this case, the SPD cannot be quickly separated from the power supply circuit, and the electric resistance of the fusible body is reduced. Therefore, even if the fusible body is spiraled, the electric resistance between the pair of terminals cannot be sufficiently reduced, and the minimum fusing current is reduced. Even when a relatively small fault current flows, the SPD cannot be quickly disconnected from the power supply circuit.
又、特許文献２に記載のヒューズにおいて、可溶体に純銀等の純金属を使用した際は、一般に純金属の電気抵抗は小さく可溶体が低融点合金を溶融させるのに必要なジュール熱を得るのに大きな電流が必要となるため、最小溶断電流を十分さげることはできず、比較的小さな故障電流が流れた場合も速やかにＳＰＤを電源回路から切離せない問題がある。 Further, in the fuse described in Patent Document 2, when pure metal such as pure silver is used for the fusible body, generally the electric resistance of the pure metal is small and the fusible body obtains Joule heat necessary for melting the low melting point alloy. However, since a large current is required, the minimum fusing current cannot be sufficiently reduced, and there is a problem that the SPD cannot be quickly disconnected from the power supply circuit even when a relatively small fault current flows.
一方、特許文献２に記載のヒューズにおいて可溶体に銀合金等の合金を使用した際は、純金属を用いた場合に比べて低融点合金との相互拡散の速度が遅いため、可溶体の電気抵抗が十分に増加する前に、溶融した低融点合金が可溶体上を流れてしまう問題がある。 On the other hand, when an alloy such as a silver alloy is used as the fusible body in the fuse described in Patent Document 2, the speed of mutual diffusion with the low melting point alloy is slower than when pure metal is used. There is a problem that the molten low melting point alloy flows on the fusible body before the resistance is sufficiently increased.
可溶体は十分な低融点合金の量が得られないため、可溶体が溶融温度に達するジュール熱が得られる電気抵抗まで増加しない。そのため可溶体を溶融させるのに必要なジュール熱を得るのに大きな電流が必要となり、最小溶断電流を十分に下げることができず、比較的小さな故障電流が流れた場合に速やかにＳＰＤを電源回路から切離せない問題がある。 Since a sufficient amount of the low melting point alloy cannot be obtained, the fusible body does not increase to an electric resistance at which Joule heat at which the fusible body reaches the melting temperature is obtained. Therefore, a large current is required to obtain the Joule heat necessary to melt the fusible material, and the minimum fusing current cannot be lowered sufficiently. When a relatively small fault current flows, the SPD is quickly connected to the power supply circuit. There is a problem that cannot be separated from.
又、大きな故障電流が流れた際に確実に電流を遮断するために、可溶体の全長周囲に二酸化珪素を主成分とした消弧剤を配置する方法が知られている。 In addition, a method is known in which an arc extinguishing agent mainly composed of silicon dioxide is disposed around the entire length of the fusible body in order to reliably cut off the current when a large fault current flows.
しかしなから、可溶体に低融点合金を溶着したヒューズにおいて、可溶体の全長周囲に二酸化珪素を主成分とした消弧剤を配置すると、低融点合金が溶融したときに、毛細管現象により低融点合金が二酸化珪素を主成分とした消弧剤間の隙間を伝わって流れてしまう。 However, in a fuse in which a low melting point alloy is welded to a fusible body, if an arc extinguishing agent mainly composed of silicon dioxide is placed around the entire length of the fusible body, when the low melting point alloy melts, a low melting point is caused by capillary action. The alloy flows through a gap between arc extinguishing agents mainly composed of silicon dioxide.
そのため、可溶体と低融点合金との間で十分な相互拡散が得られず、可溶体の電気抵抗は、溶融温度に達するジュール熱が得られる電気抵抗まで増加しないため、最小溶断電流を十分に下げることができず、小さな故障電流が流れた場合も速やかにＳＰＤを電源回路から切離すことができない問題がある。 Therefore, sufficient mutual diffusion cannot be obtained between the fusible body and the low melting point alloy, and the electric resistance of the fusible body does not increase to the electric resistance at which Joule heat reaching the melting temperature is obtained. There is a problem that the SPD cannot be quickly disconnected from the power supply circuit even when a small fault current flows.
本発明は、このような点に鑑みなされたもので、サージ電流耐量を大きくした場合でも最小溶断電流を十分に下げることができるようにして、小さな故障電流が流れた場合も速やかに電気的な切離しが行なえる電流ヒューズを提供することを目的とする。 The present invention has been made in view of such points, and even when the surge current withstand capability is increased, the minimum fusing current can be sufficiently reduced so that even when a small fault current flows, the electrical current can be promptly increased. It is an object to provide a current fuse that can be disconnected.
請求項１に記載された発明は、中空の絶縁性を有する外囲器と、この外囲器の一端及び他端に設けられた一対の端子と、これら端子間に設けられた金属の可溶体と、この可溶体に溶着された低融点合金と、この低融点合金の周囲のみを被覆した耐熱性を有する絶縁材料と、この絶縁材料及び可溶体の周囲に配置された消弧剤とを具備した電流ヒューズである。 According to the first aspect of the present invention, there is provided a hollow insulating envelope, a pair of terminals provided at one end and the other end of the envelope, and a metal fusible body provided between the terminals. A low melting point alloy welded to the fusible body, a heat-resistant insulating material covering only the periphery of the low melting point alloy, and an arc extinguishing agent disposed around the insulating material and the fusible body. Current fuse.
そして、低融点合金の周囲のみを耐熱性を有する絶縁材料で被覆しているため、低融点合金が溶融状態となっても可溶体上や消弧剤の隙間を流れることがなく、絶縁材料の内部で低融点合金の初期形状が保たれるので、可溶体の溶融に必要な低融点合金の十分な量が定位置に確保され、溶融した低融点合金と可溶体との間で進む相互拡散によって、可溶体の溶融温度に達するジュール熱が得られる電気抵抗まで、可溶体の電気抵抗が定位置で効率良く増加するため、可溶体の溶融温度に達するジュール熱を得ることができる最小溶断電流が下がり、これにより、可溶体の断面積を大きくしてサージ電流耐量を大きくした場合でも最小溶断電流を十分に下げることが可能であり、小さな故障電流が流れた場合でも速やかに電気的な切離しがなされる。 And since only the periphery of the low melting point alloy is covered with an insulating material having heat resistance, even if the low melting point alloy is in a molten state, it does not flow on the fusible body or the gap of the arc extinguishing agent, Since the initial shape of the low-melting-point alloy is maintained inside, sufficient amount of the low-melting-point alloy necessary for melting the fusible body is secured in place, and interdiffusion that proceeds between the molten low-melting-point alloy and the fusible body The electrical resistance of the fusible body efficiently increases in place up to the electrical resistance at which the Joule heat reaching the melting temperature of the fusible body is obtained, so that the minimum fusing current that can obtain the Joule heat reaching the melting temperature of the fusible body As a result, even when the cross-sectional area of the fusible body is increased to increase the surge current withstand capability, the minimum fusing current can be sufficiently reduced, and even when a small fault current flows, electrical disconnection can be performed quickly. Gana That.
請求項２に記載された発明は、請求項１記載の電流ヒューズにおいて、可溶体を、５μΩ・cm以上の体積抵抗率を有する合金としたものである。 The invention described in claim 2 is the current fuse according to claim 1, wherein the fusible body is an alloy having a volume resistivity of 5 μΩ · cm or more.
そして、金属線に体積抵抗率５μΩ・cm以上の合金を使用することで、可溶体にサージ電流が通電されるときに可溶体を流れる電流が可溶体の表皮部に集中する表皮効果の影響が抑えられる。そのため、可溶体は小さな溶断電流二乗時間積で大きなサージ電流耐量が得られ、最小溶断電流が小さくなり、小さな故障電流が流れた場合も速やかに電気的な切離しがなされる。 By using an alloy having a volume resistivity of 5 μΩ · cm or more for the metal wire, the effect of the skin effect that the current flowing through the fusible body concentrates on the skin part of the fusible body when surge current is applied to the fusible body It can be suppressed. Therefore, the fusible body can obtain a large surge current resistance with a small time-of-fault current square product, the minimum fusing current becomes small, and even when a small fault current flows, electrical disconnection is made quickly.
請求項３に記載された発明は、請求項１又は２記載の電流ヒューズにおいて、低融点合金を、Ｓｎ−5.0Ｓｂなどから成る、遷移金属を含まない合金としたものである。 According to a third aspect of the present invention, in the current fuse of the first or second aspect, the low melting point alloy is an alloy made of Sn-5.0Sb or the like that does not contain a transition metal.
そして、遷移金属を含まない低融点合金を用いることで、遷移金属を含む低融点合金を用いた場合より、可溶体と低融点合金の相互拡散の拡散速度が早くなり、更なる最小溶断電流の低下を実現する。 By using a low melting point alloy that does not contain a transition metal, the diffusion rate of mutual diffusion between the fusible body and the low melting point alloy becomes faster than when a low melting point alloy containing a transition metal is used, and a further minimum fusing current can be obtained. Realize the decline.
請求項４に記載された発明は、請求項１乃至３のいずれか記載の電流ヒューズにおいて、耐熱性を有する絶縁材料に、オルガノポリシロキサン系重合物を用いたものある。 According to a fourth aspect of the present invention, in the current fuse according to any one of the first to third aspects, an organopolysiloxane polymer is used as an insulating material having heat resistance.
そして、絶縁材料のオルガノポリシロキサン系重合物は、硬化前は液状のため、低融点合金の周囲を容易に覆うことが可能であり、又、硬化すると十分な耐熱性を有するため、可溶体の発熱によりオルガノポリシロキサン系重合物が溶融することがない。そのため、低融点合金が可溶体上を流れることなく、最小溶断電流の低下を実現し、且つ、速やかに電気的な切離しがなされる。 Since the organopolysiloxane polymer of the insulating material is liquid before curing, it can easily cover the periphery of the low melting point alloy and has sufficient heat resistance when cured. The organopolysiloxane polymer does not melt due to heat generation. Therefore, the low melting point alloy does not flow on the fusible body, so that the minimum fusing current can be reduced and electrical disconnection can be quickly performed.
請求項５に記載された発明は、請求項１乃至４のいずれか記載の電流ヒューズにおける消弧剤を、二酸化珪素を主成分としたものである。 According to a fifth aspect of the present invention, the arc extinguishing agent in the current fuse according to any one of the first to fourth aspects is mainly composed of silicon dioxide.
そして、可溶体は、低融点合金が溶着された部分を除いて、二酸化珪素を主成分とした消弧剤に接しているため、大きな故障電流が流れた場合も、二酸化珪素を主成分とした消弧剤は、その消弧作用により確実にアーク放電を消滅させて電流を遮断する。 And since the fusible body is in contact with the arc extinguishing agent mainly composed of silicon dioxide except for the portion where the low melting point alloy is deposited, even when a large fault current flows, it is mainly composed of silicon dioxide. The arc extinguishing agent surely extinguishes the arc discharge by its arc extinguishing action and interrupts the current.
請求項１記載の発明によれば、低融点合金の周囲のみを耐熱性を有する絶縁材料で被覆しており、低融点合金が溶融状態となっても可溶体上や消弧剤の隙間を流れることを防止して、絶縁材料の内部で低融点合金の初期形状を保つことができるので、可溶体の溶融に必要な低融点合金の十分な量を定位置に確保でき、溶融した低融点合金と可溶体との間で進む相互拡散によって、可溶体の溶融温度に達するジュール熱が得られる電気抵抗まで、可溶体の電気抵抗が定位置で効率良く増加するため、可溶体の溶融温度に達するジュール熱が得られる最小溶断電流を下げることができ、これにより、可溶体の断面積を大きくしてサージ電流耐量を大きくした場合でも最小溶断電流を十分に下げることができ、小さな故障電流が流れた場合でも速やかに電気的な切離しを行なうことができる。 According to the first aspect of the present invention, only the periphery of the low-melting point alloy is covered with an insulating material having heat resistance, and even if the low-melting point alloy is in a molten state, it flows on the fusible body or the gap of the arc-extinguishing agent. Since the initial shape of the low melting point alloy can be maintained inside the insulating material, a sufficient amount of the low melting point alloy necessary for melting the fusible body can be secured in place, and the molten low melting point alloy Due to the interdiffusion proceeding between the melt and the fusible body, the electric resistance of the fusible body efficiently increases in place, up to the electric resistance at which Joule heat that reaches the melting temperature of the fusible body is obtained. The minimum fusing current at which Joule heat can be obtained can be reduced, and even if the cross-sectional area of the fusible body is increased to increase the surge current withstand capability, the minimum fusing current can be sufficiently reduced and a small fault current flows. Even if It can be to perform the electrical disconnection.
請求項２記載の発明によれば、請求項１の発明の効果に加え、金属線に体積抵抗率５μΩ・cm以上の合金を用いることで、可溶体にサージ電流が通電されるときに可溶体を流れる電流が可溶体の表皮部に集中する表皮効果の影響を抑えることができる。そのため、可溶体は小さな溶断電流二乗時間積で大きなサージ電流耐量が得られ、最小溶断電流を小さくでき、小さな故障電流が流れた場合も速やかに電気的な切離しを行なうことができる。 According to the invention of claim 2, in addition to the effect of the invention of claim 1, by using an alloy having a volume resistivity of 5 μΩ · cm or more for the metal wire, when the surge current is passed through the fuse, It is possible to suppress the influence of the skin effect that the current flowing through the skin concentrates on the skin part of the soluble body. Therefore, the fusible body can obtain a large surge current resistance with a small time-of-fault current square product, the minimum fusing current can be reduced, and even when a small fault current flows, electrical disconnection can be performed quickly.
請求項３記載の発明によれば、請求項１又は請求項２の発明の効果に加え、低融点合金に遷移金属を含まない合金を用いることで、遷移金属を含む低融点合金を用いた場合より、可溶体と低融点合金との相互拡散の拡散速度が早くなり、更に最小溶断電流を低下させることができる。 According to the invention of claim 3, in addition to the effect of the invention of claim 1 or claim 2, when a low melting point alloy containing a transition metal is used by using an alloy that does not contain a transition metal in the low melting point alloy Thus, the diffusion rate of mutual diffusion between the fusible body and the low melting point alloy is increased, and the minimum fusing current can be further reduced.
請求項４記載の発明によれば、請求項１乃至３のいずれかの発明の効果に加え、耐熱性を有する絶縁材料にオルガノポリシロキサン系重合物を用いることで、このオルガノポリシロキサン系重合物は、硬化前は液状のため、低融点合金の周囲を容易に覆うことができ、製造性を向上させることができる。又、このオルガノポリシロキサン系重合物は、硬化すると十分な耐熱性を有するため、可溶体の発熱により溶融することがなく、そのため低融点合金が可溶体上を流れることなく、最小溶断電流の低下を実現でき、且つ、速やかに電気的な切離しを行なうことができる。 According to the invention described in claim 4, in addition to the effects of any one of claims 1 to 3, the organopolysiloxane polymer is used by using the organopolysiloxane polymer as a heat-resistant insulating material. Since it is liquid before hardening, the periphery of the low melting point alloy can be easily covered, and the productivity can be improved. In addition, since this organopolysiloxane polymer has sufficient heat resistance when cured, it does not melt due to the heat generated by the fusible body, so that the low melting point alloy does not flow on the fusible body and the minimum fusing current is reduced. And electrical disconnection can be performed promptly.
請求項５記載の発明によれば、請求項１乃至４のいずれかの発明の効果に加え、可溶体は、低融点合金が溶着された部分を除いて、二酸化珪素を主成分とした消弧剤に接しているため、大きな故障電流が流れた場合も、二酸化珪素を主成分とした消弧剤は、その消弧作用により、確実にアーク放電を消滅させて電流を遮断することができる。 According to the invention described in claim 5, in addition to the effects of any one of claims 1 to 4, the fusible is an arc extinguishing mainly composed of silicon dioxide except for the portion where the low melting point alloy is deposited. Even when a large fault current flows, the arc extinguishing agent mainly composed of silicon dioxide can reliably extinguish arc discharge and cut off the current by the arc extinguishing action.
以下、本発明に係る電流ヒューズを、図１に示された一実施の形態及び実施例に基いて詳細に説明する。 Hereinafter, a current fuse according to the present invention will be described in detail based on the embodiment and the example shown in FIG.
図１に示された電流ヒューズ１は、可溶体11と、この可溶体11の両端部に設けられた一対の端子としての金属端子12を有している。可溶体11は、５μΩ・cm以上の体積抵抗率を有する銀合金及び銅合金から成り、一対の金属端子12間に半田付けあるいは溶接により直線状に張設されている。
The current fuse 1 shown in FIG. 1 has a fusible body 11 and
一対の金属端子12は、銅あるいは黄銅から成る母材からつくられ、円筒型のキャップ状に形成される。この一対の金属端子12の表面にはニッケルが施されている。なお、一対の金属端子12は、可溶体11と半田付けあるいは溶接にて接続できれば、円筒型のキャップ状に限定されない。
The pair of
さらに、可溶体11の中間部、すなわち両端間の中央付近には、低融点合金13がボール状に溶着されている。この低融点合金13は、Ｓｎ−5.0Ｓｂ、Ｓｎ−3.5Ａｇ、Ｓｎ−0.75Ｃｕ等の、融点の低い合金を用いる。 Further, a low melting point alloy 13 is welded in a ball shape in the middle part of the fusible body 11, that is, near the center between both ends. As the low melting point alloy 13, an alloy having a low melting point such as Sn-5.0Sb, Sn-3.5Ag, or Sn-0.75Cu is used.
この低融点合金13の周囲のみが、オルガノポリシロキサン系重合物、フェノール樹脂、エポキシ樹脂、セラミック等の耐熱性を有する絶縁材料14により、被覆されている。 Only the periphery of the low melting point alloy 13 is covered with a heat-resistant insulating material 14 such as an organopolysiloxane polymer, a phenol resin, an epoxy resin, or a ceramic.
この絶縁材料14および可溶体11の周囲には、二酸化珪素を主成分とした消弧剤15が配置され、この消弧剤15は、一対の金属端子12と、中空の絶縁性を有するアルミナを主成分とした外囲器16とにより封止されている。なお、外囲器16は、消弧材15を封止するための円筒形の容器であるが、消弧材15を封止できる形状ならば、円筒形に限定されない。この外囲器16の一端及び他端に上記一対の金属端子12が嵌着されて一体的に設けられている。
An arc extinguishing agent 15 mainly composed of silicon dioxide is disposed around the insulating material 14 and the fusible element 11, and the arc extinguishing agent 15 includes a pair of
このように構成された電流ヒューズ１によれば、低融点合金13は、その周囲のみを耐熱性を有する絶縁材料14で被覆しているため、低融点合金13が溶融状態となっても可溶体11上や二酸化珪素を主成分とした消弧剤15の隙間を流れることがなく、絶縁材料14の内部で低融点合金13の初期形状を保つことができるので、可溶体11の溶融に必要な低融点合金13の十分な量を定位置に確保でき、溶融した低融点合金13と可溶体11との間で進む相互拡散によって、可溶体11の溶融温度に達するジュール熱が得られる電気抵抗まで、可溶体11の電気抵抗が定位置で効率良く増加するため、可溶体11の断面積を大きくしてサージ電流耐量が大きい場合でも、可溶体11の溶融温度に達するジュール熱が得られる最小溶断電流を下げることができ、これにより、比較的小さな故障電流が流れた場合でも速やかにＳＰＤを電源回路から電気的に切離すことができる。 According to the current fuse 1 configured as described above, the low melting point alloy 13 is covered only with the insulating material 14 having heat resistance, so that the fusible body 13 is soluble even when the low melting point alloy 13 is in a molten state. Since the initial shape of the low-melting-point alloy 13 can be maintained inside the insulating material 14 without flowing through the gap between the arc extinguishing agent 15 mainly composed of silicon dioxide and the silicon dioxide, it is necessary for melting the fusible body 11 A sufficient amount of the low melting point alloy 13 can be secured in a fixed position, and the electric resistance at which Joule heat reaching the melting temperature of the fusible body 11 can be obtained by the interdiffusion proceeding between the molten low melting point alloy 13 and the fusible body 11 In order to increase the electrical resistance of the fusible body 11 efficiently at a fixed position, even if the cross-sectional area of the fusible body 11 is increased and the surge current withstand capability is large, the minimum fusing that provides Joule heat reaching the melting temperature of the fusible body 11 The current can be reduced, which makes it relatively small May electrically disconnect it from the power circuit quickly SPD even when the Do fault current flows.
又、金属線に体積抵抗率５μΩ・cm以上の合金を用いることで、可溶体11にサージ電流が通電されるときに可溶体11を流れる電流が可溶体11の表皮部に集中する表皮効果の影響を抑えられる。そのため、可溶体11は小さな溶断電流二乗時間積（以下、「溶断I２t」という）で大きなサージ電流耐量が得られ、最小溶断電流を小さくでき、比較的小さな故障電流が流れた場合も速やかにＳＰＤを電源回路から電気的に切離すことができる。 Further, by using an alloy having a volume resistivity of 5 μΩ · cm or more for the metal wire, the skin effect that the current flowing through the fusible body 11 concentrates on the skin part of the fusible body 11 when a surge current is applied to the fusible body 11 is achieved. The influence can be suppressed. Therefore, the fusible body 11 can obtain a large surge current with a small fusing current square time product (hereinafter referred to as “fusing I 2 t”), the minimum fusing current can be reduced, and even when a relatively small fault current flows. In addition, the SPD can be electrically disconnected from the power supply circuit.
併せて、低融点合金13の溶着部分を除いた可溶体11は、二酸化珪素を主成分とした消弧剤15に接しているため、大きな故障電流が流れた場合も、二酸化珪素を主成分とした消弧剤15の消弧作用により、確実にアーク放電を消滅させて電流を遮断することができる。 At the same time, the fusible body 11 excluding the welded portion of the low melting point alloy 13 is in contact with the arc extinguishing agent 15 mainly composed of silicon dioxide, so that even when a large fault current flows, silicon dioxide is the major component. By the arc extinguishing action of the arc extinguishing agent 15, the arc discharge can be reliably extinguished and the current can be interrupted.
要するに、低融点合金13の周囲のみを耐熱性を有する絶縁材料14で被覆し、それ以外の可溶体11の周囲には消弧剤15を用いることで、低融点合金13と可溶体11の間で進む相互拡散作用と、消弧剤15の消弧作用により、可溶体11の小さな溶断I２t及び低い最小溶断電流で大きなサージ電流耐量を確保でき、且つ、高い電流遮断能力を有する、ＳＰＤの分離に適した電流ヒューズを提供することができる。 In short, only the periphery of the low-melting-point alloy 13 is covered with the insulating material 14 having heat resistance, and an arc extinguishing agent 15 is used around the other fusible body 11, so that the low-melting-point alloy 13 and the fusible-body 11 are separated. SPD which can secure a large surge current resistance with a small fusing I 2 t of the fusible body 11 and a low minimum fusing current, and has a high current interruption capability, due to the interdiffusion action proceeding in step 1 and the arc extinguishing action of the arc extinguishing agent 15. Therefore, it is possible to provide a current fuse suitable for isolation.
又、遷移金属を含まない低融点合金13を用いることで、遷移金属を含む低融点合金を用いた場合より、可溶体11と低融点合金13との相互拡散の拡散速度が早くなり、更なる最小溶断電流の低下を実現できる。 Further, by using the low melting point alloy 13 that does not contain a transition metal, the diffusion rate of mutual diffusion between the fusible body 11 and the low melting point alloy 13 becomes faster than when a low melting point alloy containing a transition metal is used. A reduction in the minimum fusing current can be realized.
更に、耐熱性を有する絶縁材料14のオルガノポリシロキサン系重合物は、硬化前は液状のため、低融点合金13の周囲を容易に覆うことができ、製造性を向上させることができる。又、このオルガノポリシロキサン系重合物は、硬化すると十分な耐熱性を有するため、可溶体11の発熱により溶融することがない。そのため、低融点合金13が可溶体11上を流れることなく、最小溶断電流の低下を実現でき、且つ、速やかにＳＰＤを電源回路から電気的に切離すことができる。 Further, since the organopolysiloxane polymer of the insulating material 14 having heat resistance is in a liquid state before being cured, the periphery of the low melting point alloy 13 can be easily covered, and the productivity can be improved. Further, since this organopolysiloxane polymer has sufficient heat resistance when cured, it is not melted by the heat generated by the soluble material 11. Therefore, the low melting point alloy 13 does not flow on the fusible body 11 and a reduction in the minimum fusing current can be realized, and the SPD can be quickly electrically disconnected from the power supply circuit.
上記の一実施形態の電流ヒューズに対し、可溶体11に直径１．２mmの、56Ａｇ−22Ｃｕ−17Ｚｎ−5Ｓｎから成る銀ろう線を用い、低融点合金13に遷移金属を含まないＳｎ−5.0Ｓｂ、耐熱性を有する絶縁材料14としてオルガノポリシロキサン系重合物であるＫＥ−１８６７（信越化学工業株式会社）を用いた。又、二酸化珪素を主成分とした消弧剤15は、ＳｉＯ２−残０．５を用い、直径１３mm、長さ５０mmの円筒形の外囲器16と円筒形のキャップにて封止してサージ耐久性試験、通電試験を行った。 For the current fuse of the above-described embodiment, a silver solder wire made of 56Ag-22Cu-17Zn-5Sn having a diameter of 1.2 mm is used as the fusible element 11, and Sn-5.0Sb containing no transition metal in the low melting point alloy 13 is used. As the insulating material 14 having heat resistance, KE-1867 (Shin-Etsu Chemical Co., Ltd.), which is an organopolysiloxane polymer, was used. The arc extinguishing agent 15 mainly composed of silicon dioxide uses SiO 2 -the remaining 0.5, and is sealed with a cylindrical envelope 16 having a diameter of 13 mm and a length of 50 mm and a cylindrical cap. Surge durability test and energization test were conducted.
上記一実施形態の電流ヒューズにおける実施例について、表１及び表２を参照して説明する。 Examples of the current fuse of the above-described embodiment will be described with reference to Tables 1 and 2.
比較例として、可溶体の金属及び形状、低融点合金を変えた４種類のヒューズに対して同一の試験を行った。なお、比較例として用いた４種類のヒューズは、可溶体、低融点合金及び耐熱性を有する絶縁材料を除き、上記一実施形態のヒューズと同一構造である。 As a comparative example, the same test was performed on four types of fuses having different fusible metals and shapes and low melting point alloys. Note that the four types of fuses used as comparative examples have the same structure as the fuse of the above-described embodiment except for a fusible body, a low melting point alloy, and an insulating material having heat resistance.
比較例１のヒューズは、可溶体に直径０．７５mmの銅を用い、可溶体両端間の中央付近にＳｎ−3.5Ａｇから成る低融点合金を溶着させ、低融点合金に対し、耐熱性を有する絶縁材料による被覆を施さないものである。 The fuse of Comparative Example 1 uses copper having a diameter of 0.75 mm as a fusible body, and a low melting point alloy made of Sn-3.5Ag is deposited near the center between both ends of the fusible body, and has heat resistance to the low melting point alloy. It is not coated with an insulating material.
比較例２のヒューズは、直径０．７５mmの銅を用い、直径４mm、６mm間隔で螺旋状に成型したものを可溶体とし、可溶体両端間の中央付近にＳｎ−3.5Ａｇから成る低融点合金を溶着させ、低融点合金に対し、耐熱性を有する絶縁材料による被覆を施さないものである。 The fuse of Comparative Example 2 is made of copper having a diameter of 0.75 mm, spirally formed at intervals of 4 mm and 6 mm in diameter, and a fusible body, and a low melting point alloy made of Sn-3.5Ag near the center between both ends of the fusible body. The low melting point alloy is not coated with a heat-resistant insulating material.
比較例３のヒューズは、可溶体に直径１．２mmの、56Ａｇ−22Ｃｕ−17Ｚｎ−5Ｓｎから成る銀ろう線を用い、可溶体両端間の中央付近にＳｎ−3.5Ａｇから成る低融点合金を溶着させ、低融点合金に対し、耐熱性を有する絶縁材料による被覆を施さないものである。 The fuse of Comparative Example 3 uses a silver brazing wire made of 56Ag-22Cu-17Zn-5Sn with a diameter of 1.2 mm for the fusible body, and a low melting point alloy made of Sn-3.5Ag is deposited near the center between both ends of the fusible body. Thus, the low melting point alloy is not coated with a heat-resistant insulating material.
比較例４のヒューズは、可溶体に直径１．２mmの、56Ａｇ−22Ｃｕ−17Ｚｎ−5Ｓｎから成る銀ろう線を用い、可溶体両端間の中央付近にＳｎ−5.0Ｓｂから成る遷移金属を含まない低融点合金を溶着させ、低融点合金に対し、耐熱性を有する絶縁材料による被覆を施さないものである。 The fuse of Comparative Example 4 uses a silver brazing wire made of 56Ag-22Cu-17Zn-5Sn with a diameter of 1.2 mm for the fusible body, and does not contain a transition metal made of Sn-5.0Sb near the center between both ends of the fusible body. A low melting point alloy is deposited, and the low melting point alloy is not coated with an insulating material having heat resistance.
まず、上記の実施例、比較例１、比較例２、比較例３及び比較例４に示すヒューズに対し、８／２０μｓのサージ波形、２０ｋＡのサージ電流、６０００Ａ２ｓのジュール積分値を有するサージを印加し、およそ３０回のサージ耐久性を有するために必要な溶断I２tを求めた。その結果を、表１に示す。
又、実施例、比較例１、比較例２、比較例３及び比較例４に示すヒューズに通電試験を行いおよそ５００秒で可溶体が溶断する溶断電流を求めた。その結果を表２に示す。
表１に示すように、可溶体に純金属を用いた比較例１、比較例２に示すヒューズはおおよそ３０回耐久性を有するのに１８０００Ａ２ｓ以上の溶断I２tが必要なのに対し、可溶体に体積抵抗率が５μΩ・cm以上の銀ろう線を用いた実施例、比較例３、比較例４に示すヒューズは１３０００Ａ２ｓという極めて小さな溶断I２tで３０回耐久性を実現した。 As shown in Table 1, the fuses shown in Comparative Example 1 and Comparative Example 2 using pure metal as the fusible body have a durability of about 30 times, but need a fusing I 2 t of 18000 A 2 s or more. The fuses shown in Examples, Comparative Example 3, and Comparative Example 4 using a silver solder wire having a volume resistivity of 5 μΩ · cm or more as the solution realized durability 30 times with a very small fusing I 2 t of 13000 A 2 s.
更に、実施例、比較例３、比較例４の溶断特性を比較すると、表２に示すように、比較例の最小溶断電流が４６Ａ以上であるのに対し、実施例は低融点合金の周囲のみをオルガノポリシロキサン系重合物で覆い、且つ、低融点合金に遷移金属を含まないＳｎ−5.0Ｓｂを用いたことで、最小溶断電流が４１Ａと最も低い電流により、およそ５００秒で溶断した。 Furthermore, when the fusing characteristics of the example, the comparative example 3 and the comparative example 4 are compared, as shown in Table 2, the minimum fusing current of the comparative example is 46 A or more, whereas the example is only around the low melting point alloy. Was covered with an organopolysiloxane-based polymer, and Sn-5.0Sb containing no transition metal was used for the low melting point alloy, so that the minimum fusing current was 41 A and the lowest current was about 500 seconds.
以上のことより、実施例のヒューズは、１３０００Ａ２ｓという低い溶断I２tで、８／２０μｓのサージ波形、２０ｋＡのサージ電流、６０００Ａ２ｓのジュール積分値を有するサージに対し、おおよそ３０回の耐久性を有すると共に、４１Ａという低い最小溶断電流を示すことが認められた。 From the above, the fuse of the example has a fusing I 2 t as low as 13000 A 2 s, a surge waveform of 8/20 μs, a surge current of 20 kA, and a surge having a Joule integral value of 6000 A 2 s approximately 30 times. And having a minimum fusing current as low as 41 A.
次に、一実施形態のヒューズに対し、試験条件ＡＣ２５０Ｖ、１００ｋＡ、力率０．２３で短絡遮断試験を実施した。 Next, a short circuit breaking test was performed on the fuse of one embodiment under the test conditions of AC 250 V, 100 kA, and a power factor of 0.23.
この短絡遮断試験の結果、一実施形態のヒューズは、可溶体の周囲に配置した二酸化珪素を主成分とした消弧剤の消弧作用により、破裂等の外観不良及び、再発弧等の問題なく遮断に成功した。又、遮断後の絶縁抵抗は１０００ＭΩ以上得られ、絶縁性が高いことがわかった。 As a result of this short-circuit interruption test, the fuse of one embodiment has no problem of appearance failure such as rupture and recurring arc due to the arc extinguishing action of the arc extinguishing agent mainly composed of silicon dioxide disposed around the fusible body. Successfully blocked. Moreover, the insulation resistance after interruption was obtained at 1000 MΩ or more, and it was found that the insulation was high.
本発明は、短絡又は劣化したＳＰＤなどを電源回路から切離し保護する電流ヒューズに利用可能である。 INDUSTRIAL APPLICABILITY The present invention can be used for a current fuse that protects a short circuited or deteriorated SPD from a power supply circuit.
１ 電流ヒューズ
11 可溶体
12 端子としての金属端子
13 低融点合金
14 絶縁材料
15 消弧剤
16 外囲器
1 Current fuse
11 Soluble body
12 Metal terminal as terminal
13 Low melting point alloy
14 Insulating material
15 Arc-extinguishing agent
16 Envelope
Claims (5)
この外囲器の一端及び他端に設けられた一対の端子と、
これら端子間に設けられた金属の可溶体と、
この可溶体に溶着された低融点合金と、
この低融点合金の周囲のみを被覆した耐熱性を有する絶縁材料と、
この絶縁材料及び可溶体の周囲に配置された消弧剤と
を具備したことを特徴とする電流ヒューズ。 A hollow insulating envelope;
A pair of terminals provided at one end and the other end of the envelope;
A metal fusible body provided between these terminals,
A low melting point alloy welded to the fusible body,
An insulating material having heat resistance coated only around the low melting point alloy;
A current fuse comprising: an arc extinguishing agent disposed around the insulating material and the fusible body.
ことを特徴とする請求項１記載の電流ヒューズ。 The current fuse according to claim 1, wherein the fusible body is an alloy having a volume resistivity of 5 μΩ · cm or more.
ことを特徴とする請求項１又は２記載の電流ヒューズ。 The current fuse according to claim 1, wherein the low melting point alloy is an alloy that does not include a transition metal.
ことを特徴とする請求項１乃至３のいずれか記載の電流ヒューズ。 The current fuse according to any one of claims 1 to 3, wherein the insulating material is an organopolysiloxane polymer.
ことを特徴とする請求項１乃至４のいずれか記載の電流ヒューズ。 5. The current fuse according to claim 1, wherein the arc-extinguishing agent is mainly composed of silicon dioxide.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400732A (en) * | 2013-07-08 | 2013-11-20 | 东莞市博钺电子有限公司 | Arc-extinguishing material for fuse and preparation method of arc-extinguishing material |
| CN107452558A (en) * | 2017-08-30 | 2017-12-08 | Aem科技(苏州)股份有限公司 | A kind of surface mounting fuse protector and its manufacture method |
| WO2020237770A1 (en) * | 2019-05-31 | 2020-12-03 | 厦门大恒科技有限公司 | Multi-stage fuse structure capable of withstanding lightning current, and fuse using same |
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| JPH09115418A (en) * | 1995-10-16 | 1997-05-02 | Matsuo Denki Kk | Thin film fuse of delay type |
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| JPS5618333A (en) * | 1979-07-24 | 1981-02-21 | Tokyo Shibaura Electric Co | Current limiting fuse |
| JPS5763742A (en) * | 1980-10-03 | 1982-04-17 | Hitachi Ltd | Method of forming fuse element stationary rod |
| JPS62180929A (en) * | 1986-02-04 | 1987-08-08 | 富士電機株式会社 | Miniature fuse |
| JPH0333938U (en) * | 1989-08-11 | 1991-04-03 | ||
| JPH09115418A (en) * | 1995-10-16 | 1997-05-02 | Matsuo Denki Kk | Thin film fuse of delay type |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103400732A (en) * | 2013-07-08 | 2013-11-20 | 东莞市博钺电子有限公司 | Arc-extinguishing material for fuse and preparation method of arc-extinguishing material |
| CN107452558A (en) * | 2017-08-30 | 2017-12-08 | Aem科技(苏州)股份有限公司 | A kind of surface mounting fuse protector and its manufacture method |
| CN107452558B (en) * | 2017-08-30 | 2020-03-31 | Aem科技(苏州)股份有限公司 | Surface-mounted fuse and manufacturing method thereof |
| WO2020237770A1 (en) * | 2019-05-31 | 2020-12-03 | 厦门大恒科技有限公司 | Multi-stage fuse structure capable of withstanding lightning current, and fuse using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5346705B2 (en) | 2013-11-20 |
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