JP2007280662A

JP2007280662A - Cylinder type thermal fuse

Info

Publication number: JP2007280662A
Application number: JP2006102774A
Authority: JP
Inventors: Mitsuaki Uemura; 充明植村
Original assignee: Uchihashi Estec Co Ltd
Current assignee: Uchihashi Estec Co Ltd
Priority date: 2006-04-04
Filing date: 2006-04-04
Publication date: 2007-10-25
Anticipated expiration: 2026-04-04
Also published as: JP4717686B2

Abstract

<P>PROBLEM TO BE SOLVED: To improve operation performance of a cylinder type thermal fuse with a flange at the tip of a lead conductor. <P>SOLUTION: In the thermal fuse made up by connecting a fuse element 2 between opposing lead conductors each having a flange 11 at its tip part, coating a flux 3 on the fuse element, inserting the flux-coated fuse element into a cylindrical case 4 covering it, and sealing a space between each end of the cylindrical case and each lead conductor with a sealant 5, at least either a corner between a front face and an outer periphery face of the flange or that between a rear face and the outer periphery face of the flange is to be a radiused face 120. Hindrance of wetting spread of the melting fuse element at the corners can be mitigated as compared with the case of right-angle corners. Therefore, breaking action performance can be well assured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は筒型温度ヒューズに関するものである。 The present invention relates to a cylindrical thermal fuse.

電子・電気機の熱的な保護素子として温度ヒューズが知られている。
温度ヒューズは、所定融点の可溶合金片にフラックスを塗布したものをヒューズエレメントとしている。使用にあたり保護対象である電子・電気機器に熱的に接触して取付けられ、電子・電気機器が過電流により異常に過熱されるとヒューズエレメントが溶融され、この溶融物が溶融活性化フラックスのバックアップを受けつつリード導体端部若しくは電極への濡れ拡がりにより分断され、電子・電気機器への給電が遮断される。 Thermal fuses are known as thermal protection elements for electronic and electric machines.
A thermal fuse is a fuse element in which a flux is applied to a soluble alloy piece having a predetermined melting point. It is installed in thermal contact with the electronic / electrical equipment that is to be protected in use. When the electronic / electrical equipment is abnormally overheated by overcurrent, the fuse element is melted and this melt is backed up by the melt activation flux. As a result, the lead conductor ends or the electrodes are divided by wetting and spreading, and the power supply to the electronic / electrical equipment is cut off.

温度ヒューズとして、図５に示すように、対向リード導体１’，１’間にヒューズエレメント２’を接続し、ヒューズエレメント２’にフラックス３’を塗布し、該フラックス塗布ヒューズエレメントを覆って筒状ケース４’を挿通し、筒状ケースの各端と各リード導体との間を封止材５’で封止してなる筒型温度ヒューズが汎用されており、フラックス塗布ヒューズエレメントと筒状ケース内面との接触を確実に防止して前記分断の円滑性を確保するために、図５の１１’で示すようにリード導体１’の先端に鍔を設けることが知られている（特許文献１、特許文献２等を参照）。 As a thermal fuse, as shown in FIG. 5, a fuse element 2 ′ is connected between opposing lead conductors 1 ′ and 1 ′, a flux 3 ′ is applied to the fuse element 2 ′, and the flux-applied fuse element is covered to form a cylinder. A cylindrical thermal fuse is used which is inserted through a cylindrical case 4 ′ and sealed between each end of the cylindrical case and each lead conductor with a sealing material 5 ′. In order to reliably prevent contact with the inner surface of the case and to ensure the smoothness of the division, it is known to provide a flange at the tip of the lead conductor 1 ′ as shown by 11 ′ in FIG. 1, see Patent Document 2).

特公平８−０８０３５号公報Japanese Patent Publication No. 8-08035 特公平７−６６７２８号公報Japanese Patent Publication No. 7-66728

しかしながら、本発明者の鋭意検討結果によれば、リード導体先端の鍔の角が実質的に直角であり、溶融ヒューズエレメントの濡れ拡がりがその角で阻害され、分断が生じ難くなって動作温度の範囲が拡がることが判明した。 However, according to the inventor's diligent study results, the corner of the lead conductor tip is substantially perpendicular, and the wetting and spreading of the molten fuse element is hindered by the corner, so that it is difficult for fragmentation to occur. It was found that the range expanded.

本発明の目的は、上記の知見に基づき、リード導体の先端に鍔を設けた筒型温度ヒューズの動作性能の向上を図ることにある。 An object of the present invention is to improve the operation performance of a cylindrical thermal fuse having a flange at the tip of a lead conductor based on the above knowledge.

請求項１に係る筒型温度ヒューズは、先端部に鍔を有する対向リード導体間にヒューズエレメントを接続し、ヒューズエレメントにフラックスを塗布し、該フラックス塗布ヒューズエレメントを覆って筒状ケースを挿通し、筒状ケースの各端と各リード導体との間を封止材で封止してなる温度ヒューズにおいて、鍔前面と鍔外周面との間のコーナ及び鍔後面と鍔外周面との間のコーナの少なくとも一方をアール面としたことを特徴とする。
請求項２に係る筒型温度ヒューズは、請求項１の筒型温度ヒューズにおいて、アール面の曲率半径を鍔厚みの１／２〜１／１０としたことを特徴とする。
請求項３に係る筒型温度ヒューズは、請求項１または２記載の筒型温度ヒューズにおいて、フラックスを鍔部の後面にかかるように塗布したことを特徴とする。 The cylindrical thermal fuse according to claim 1 is configured such that a fuse element is connected between opposing lead conductors having a flange at the tip, a flux is applied to the fuse element, and the cylindrical case is inserted through the flux-applied fuse element. In the thermal fuse formed by sealing between each end of the cylindrical case and each lead conductor with a sealing material, the corner between the front surface and the outer peripheral surface of the heel and the rear surface of the heel and the outer peripheral surface of the heel It is characterized in that at least one of the corners is a rounded surface.
A cylindrical thermal fuse according to a second aspect is the cylindrical thermal fuse according to the first aspect, wherein the radius of curvature of the rounded surface is set to 1/2 to 1/10 of the thickness of the flange.
A cylindrical thermal fuse according to a third aspect is the cylindrical thermal fuse according to the first or second aspect, wherein a flux is applied so as to be applied to a rear surface of the flange portion.

リード線先端の鍔外周側のコーナをアール面としたから、直角コーナの場合に較べて溶融ヒューズエレメントの濡れ拡がりがコーナで阻害されるのをよく軽減できる。従って、分断動作性能を充分に保証できる。 Since the corner on the outer periphery side of the lead wire tip is a rounded surface, it is possible to well reduce the obstruction of the molten fuse element by the corner compared to the case of a right angle corner. Therefore, it is possible to sufficiently guarantee the dividing operation performance.

以下、図面を参照しつつ本発明の実施形態について説明する。
図１は本発明の一実施例を示している。
図１において、１は銅リード導体であり、先端に鍔１１を備えている。この鍔はリード導体の先端部を圧縮塑性加工することにより形成できる。鍔前面と鍔外周面との間のコーナ１２及び鍔後面と鍔外周面との間のコーナ１２をアール面としてあり、そのアール面の曲率半径Ｒは、鍔の巾をＷとして、ｗ／２〜ｗ／１０としてある。２は温度ヒューズの設定動作温度に応じた融点のヒューズエレメント合金であり、その径をリード導体の径の０．８〜１．３倍とし、両リード導体の鍔前面間に溶接により接続してある。３はフラックスであり、ヒューズエレメント２上からリード導体の鍔後面１２０にかかるように塗布してある。
４は耐熱性の筒状絶縁体ケース、例えばセラミックス筒である。５は筒状ケースの各端と各リード導体との間を封止した封止材、例えばエポキシ樹脂である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a copper lead conductor, which is provided with a flange 11 at the tip. This ridge can be formed by compressive plastic working the tip of the lead conductor. The corner 12 between the heel front surface and the heel outer peripheral surface and the corner 12 between the heel rear surface and the heel outer peripheral surface are rounded surfaces, and the radius of curvature R of the rounded surface is w / 2, where the width of the heel is W. ~ W / 10. 2 is a fuse element alloy having a melting point corresponding to the set operating temperature of the thermal fuse, the diameter of which is 0.8 to 1.3 times the diameter of the lead conductor, and is connected by welding between the front faces of both lead conductors. is there. Reference numeral 3 denotes a flux, which is applied so as to cover the rear surface 120 of the lead conductor from above the fuse element 2.
Reference numeral 4 denotes a heat-resistant cylindrical insulator case, for example, a ceramic cylinder. Reference numeral 5 denotes a sealing material that seals between each end of the cylindrical case and each lead conductor, for example, an epoxy resin.

前記の筒状絶縁体ケースが前記フラックス塗布ヒューズエレメント上に治具を使用して同心位置で挿通され、この同心位置を保持して封止材による封止が行われる。この場合、鍔の外径が筒状絶縁体ケースの内径にほぼ等しくされているので（筒状絶縁体ケース内径の０．７５倍〜０．９５倍）、前記の同心位置をよく保証でき、前記フラックス塗布ヒューズエレメントと筒状絶縁体ケース内面との接触を確実に防止できる。 The cylindrical insulator case is inserted on the flux-applied fuse element at a concentric position using a jig, and the concentric position is maintained and sealing with a sealing material is performed. In this case, since the outer diameter of the flange is substantially equal to the inner diameter of the cylindrical insulator case (0.75 to 0.95 times the inner diameter of the cylindrical insulator case), the above concentric position can be well guaranteed, Contact between the flux-applied fuse element and the inner surface of the cylindrical insulator case can be reliably prevented.

上記ヒューズエレメントには、環境保全上、鉛、ガドミウム等の有害金属を含まない合金を使用することが好ましく、動作温度に応じて次の合金組成か選択できる。
[Ａ]（１）４３％≦Ｓｎ≦７０％，０．５％≦Ｉｎ≦１０％，残Ｂｉ、（２）２５％≦Ｓｎ≦４０％，５０％≦Ｉｎ≦５５％，残Ｂｉ、（３）２５％≦Ｓｎ≦４４％，５５％≦Ｉｎ≦７４％，１％≦Ｂｉ≦２０％、（４）４６％≦Ｓｎ≦７０％，１８％≦Ｉｎ≦４８％，１％≦Ｂｉ≦１２％、（５）５％≦Ｓｎ≦２８％，１５％≦Ｉｎ≦３７％，残Ｂｉ（但し、Ｂｉ５７．５％，Ｉｎ２５．２％，Ｓｎ１７．３％とＢｉ５４％，Ｉｎ２９．７％，Ｓｎ１６．３％のそれぞれを基準にＢｉ±２％，Ｉｎ及びＳｎ±１％の範囲を除く）、（６）１０％≦Ｓｎ≦１８％，３７％≦Ｉｎ≦４３％，残Ｂｉ、（７）２５％≦Ｓｎ≦６０％，２０％≦Ｉｎ≦５０％，１２％≦Ｂｉ≦３３％、（８）（１）〜（７）の何れか１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｓｂ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、（９）３３％≦Ｓｎ≦４３％，０．５％≦Ｉｎ≦１０％，残Ｂｉ、（１０）４７％≦Ｓｎ≦４９％，５１％≦Ｉｎ≦５３％の１００重量部にＢｉを３〜５重量部を添加、（１１）４０％≦Ｓｎ≦４６％，７％≦Ｂｉ≦１２％，残Ｉｎ、（１２）０．３％≦Ｓｎ≦１．５％，５１％≦Ｉｎ≦５４％，残Ｂｉ、（１３）２．５％≦Ｓｎ≦１０％，２５％≦Ｂｉ≦３５％，残Ｉｎ、（１４）（９）〜（１３）の何れか１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｓｂ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、（１５）１０％≦Ｓｎ≦２５％，４８％≦Ｉｎ≦６０％，残Ｂｉを１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｓｂ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、等のＩｎ−Ｓｎ−Ｂｉ系合金の組成[Ｂ]（１６）３０％≦Ｓｎ≦７０％，０．３％≦Ｓｂ≦２０％，残Ｂｉ、（１７）（１６）の１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、等のＢｉ−Ｓｎ−Ｓｂ系合金の組成[Ｃ]（１８）５２％≦Ｉｎ≦８５％，残Ｓｎ、（１９）（１８）の１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｓｂ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、等のＩｎ−Ｓｎ系合金の組成[Ｄ]（２０）４５％≦Ｂｉ≦５５％，残Ｉｎ、（２１）（２０）の組成の１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｓｂ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、等のＩｎ−Ｂｉ系合金の組成、[Ｅ]（２２）５０％≦Ｂｉ≦５６％，残Ｓｎ、（２３）（２２）の１００重量部にＡｇ、Ａｕ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、等のＢｉ−Ｓｎ系合金の組成[Ｆ]（２４）Ｉｎの１００重量部にＡｕ、Ｂｉ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、（２５）９０％≦Ｉｎ≦９９．９％，０．１％≦Ａｇ≦１０％の１００重量部にＡｕ、Ｂｉ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加、（２６）９５％≦Ｉｎ≦９９．９％，０．１％≦Ｓｂ≦５％の１００重量部にＡｕ、Ｂｉ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加等のＩｎ系合金の組成（２７）２％≦Ｚｎ≦１５％，７０％≦Ｓｎ≦９５％，残Ｂｉ及びその合金１００重量部にＡｕ、Ｉｎ、Ｃｕ、Ｎｉ、Ｐｄ、Ｐｔ、Ｇａ、Ｇｅ、Ｐの１種または２種以上を合計０．０１〜７重量部添加した合金の組成。 For the environmental protection, it is preferable to use an alloy that does not contain harmful metals such as lead and cadmium, and the following alloy composition can be selected according to the operating temperature.
[A] (1) 43% ≦ Sn ≦ 70%, 0.5% ≦ In ≦ 10%, remaining Bi, (2) 25% ≦ Sn ≦ 40%, 50% ≦ In ≦ 55%, remaining Bi, ( 3) 25% ≦ Sn ≦ 44%, 55% ≦ In ≦ 74%, 1% ≦ Bi ≦ 20%, (4) 46% ≦ Sn ≦ 70%, 18% ≦ In ≦ 48%, 1% ≦ Bi ≦ 12%, (5) 5% ≦ Sn ≦ 28%, 15% ≦ In ≦ 37%, remaining Bi (Bi57.5%, In25.2%, Sn17.3% and Bi54%, In29.7%, (Excluding ranges of Bi ± 2%, In and Sn ± 1% based on each of Sn 16.3%), (6) 10% ≦ Sn ≦ 18%, 37% ≦ In ≦ 43%, remaining Bi, (7 ) 25% ≦ Sn ≦ 60%, 20% ≦ In ≦ 50%, 12% ≦ Bi ≦ 33%, (8) Ag, Au, Cu, 100 parts by weight of any one of (1) to (7) Add one or more of i, Pd, Pt, Sb, Ga, Ge and P in a total of 0.01 to 7 parts by weight, (9) 33% ≦ Sn ≦ 43%, 0.5% ≦ In ≦ 10 %, Remaining Bi, (10) 47% ≦ Sn ≦ 49%, 51% ≦ In ≦ 53%, 100 parts by weight of Bi is added with 3 to 5 parts by weight of Bi, (11) 40% ≦ Sn ≦ 46%, 7 % ≦ Bi ≦ 12%, remaining In, (12) 0.3% ≦ Sn ≦ 1.5%, 51% ≦ In ≦ 54%, remaining Bi, (13) 2.5% ≦ Sn ≦ 10%, 25 % ≦ Bi ≦ 35%, remaining In, (14) any one of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P in 100 parts by weight of any one of (14), (9) to (13) Add 2 or more kinds in total 0.01 to 7 parts by weight, (15) 10% ≦ Sn ≦ 25%, 48% ≦ In ≦ 60%, 100 parts by weight of remaining Bi, Ag, Au, Cu Composition of In—Sn—Bi-based alloy such as 0.01 to 7 parts by weight in total of one or more of Ni, Pd, Pt, Sb, Ga, Ge, and P [B] (16) 30% ≦ Sn ≦ 70%, 0.3% ≦ Sb ≦ 20%, remaining Bi, (17) One type of Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge, P in (17) (16) Or the composition of the Bi—Sn—Sb alloy, such as addition of two or more kinds in a total of 0.01 to 7 parts by weight, etc. [C] (18) 52% ≦ In ≦ 85%, remaining Sn, (19) (18) Composition of In-Sn based alloy such as one or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P added to 100 parts by weight in a total of 0.01 to 7 parts by weight [D] (20) 45% ≦ Bi ≦ 55%, remaining In, (21) In 100 parts by weight of the composition of (20), Ag, Au, Cu, Ni, Pd, P Composition of In-Bi alloy such as total addition of 0.01 to 7 parts by weight of one or more of t, Sb, Ga, Ge and P, [E] (22) 50% ≦ Bi ≦ 56% , Remaining Sn, (23) Addition of 0.01 to 7 parts by weight of one or more of Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge and P to 100 parts by weight of (22), Bi-Sn based alloy composition [F] (24) One or two or more of Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, P in a total of 0.01 parts by weight of In total 0.01 -7 parts by weight, (25) Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, 100 parts by weight of 90% ≦ In ≦ 99.9%, 0.1% ≦ Ag ≦ 10% Add one or more of P in a total of 0.01 to 7 parts by weight, (26) 95% ≦ In ≦ 99.9%, 0.1% ≦ Sb ≦ 5% 10 Composition of In-based alloy in which one or more of Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, P are added to 0 part by weight in a total of 0.01 to 7 parts by weight (27) 2% ≦ Zn ≦ 15%, 70% ≦ Sn ≦ 95%, remaining Bi and 100 parts by weight of its alloy are combined with one or more of Au, In, Cu, Ni, Pd, Pt, Ga, Ge, P in total 0 The composition of the alloy with 0.01 to 7 parts by weight added.

上記フラックスには、ロジンを主成分とするものを使用できる。ロジンの成分は、アビエチン酸１６〜２９％、ネオアビエチン酸１５〜２０％、パラストリン酸１８〜２０％、イソピマル酸１６〜１８％、ピマル酸３〜４％、サンダラコピマル酸１〜２％、コムン酸３〜４％、デヒドロアビエチン酸４〜７％、その他２〜３％であり、活性を高めるために有機酸、例えばモノまたはジカルボン酸、例えばアビエチン酸を添加できる。 As the flux, one containing rosin as a main component can be used. The components of rosin are 16 to 29% abietic acid, 15 to 20% neoabietic acid, 18 to 20% parastrinic acid, 16 to 18% isopimaric acid, 3 to 4% pimaric acid, 1 to 2% sandaracopimaric acid, Comnic acid 3-4%, dehydroabietic acid 4-7%, others 2-3%, organic acids such as mono- or dicarboxylic acids such as abietic acid can be added to increase activity.

本発明に係る温度ヒューズは、例えば電子機器（コンピュータ、テレビ、ビデオ、トランス、ソレノイド、アダプター、ＩＣ等）、電動機（扇風機、掃除機等の小型モータ使用機器）、電熱機器（ドライヤー、電気カーペット、ストーブ等）の保護に使用される。
その保護対象機器が過電流により発熱されると、まず、フラックスが溶融され、更に、ヒューズエレメントが溶融され、この溶融合金がフラックスの活性作用（主に酸化膜除去作用）のバックアップを受けつつ界面張力によりリード導体の鍔を越えて濡れ拡がり分断される。 Thermal fuses according to the present invention include, for example, electronic devices (computers, televisions, videos, transformers, solenoids, adapters, ICs, etc.), electric motors (devices using small motors such as electric fans and vacuum cleaners), electric heating devices (dryers, electric carpets, Used to protect stoves, etc.)
When the device to be protected generates heat due to overcurrent, the flux is first melted, the fuse element is melted, and the molten alloy is backed up by the flux active action (mainly oxide film removal action). Tension breaks and spreads over the lead conductor ridges.

本発明に係る温度ヒューズでは、リード導体の鍔外周のコーナをアール面としているから、当該コーナが実質的に直角である従来品に較べ前記の鍔を乗り越えての溶融ヒューズエレメントの濡れ拡がりをよく促進でき、良好な分断性能を得ることができる。
上記鍔のアール面の曲率半径を鍔の巾Ｗに対しＷ／１０以上とした理由は、これ未満では前記分断性能の充分な向上を得ることが困難であるからである。同曲率半径をＷ／２以下とした理由は、これを越えると鍔外周面が山状に膨らみ、これが前記濡れ拡がりを阻害するようになるからである。 In the thermal fuse according to the present invention, the corner of the outer periphery of the lead conductor has a rounded surface, so that the melted fuse element is better spread over the aforementioned flange than the conventional product in which the corner is substantially perpendicular. It can be promoted and good cutting performance can be obtained.
The reason why the radius of curvature of the rounded surface of the ridge is set to W / 10 or more with respect to the width W of the ridge is that if it is less than this, it is difficult to obtain a sufficient improvement in the cutting performance. The reason why the radius of curvature is set to W / 2 or less is that if this radius is exceeded, the outer peripheral surface of the ridge swells in a mountain shape, which inhibits the wetting and spreading.

本発明に係る温度ヒューズにおいては、図２に示すように、リード導体１の鍔１１が筒状ケース内面で支持されていてもよい。
また、フラックス層３は、図３に示すように、長手方向に連続されていれば、周方向に対し部分的であってもよい。また、鍔１１は図４に示すように、リード導体先端１０から０．４〜１．０ｍｍの距離ΔＬを隔てた位置に設けることもできる。 In the thermal fuse according to the present invention, as shown in FIG. 2, the flange 11 of the lead conductor 1 may be supported by the inner surface of the cylindrical case.
Moreover, as shown in FIG. 3, the flux layer 3 may be partial in the circumferential direction as long as it is continuous in the longitudinal direction. Further, as shown in FIG. 4, the flange 11 can be provided at a position separated from the lead conductor tip 10 by a distance ΔL of 0.4 to 1.0 mm.

図１において、銅リード導体１の外径を０．６ｍｍφ、鍔外径を１．２ｍｍφ、鍔巾を０．２ｍｍ、鍔コーナの曲率半径を８０μｍとした。ヒューズエレメント２には、外径０．６ｍｍφ、長さ３ｍｍのＢＩＳ系合金線（Ｓｎ：３％，Ｉｎ：６４％，Ｂｉ：３３％、固相線温度：７０℃）を使用し、フラックス３には天然ロジンにアジピン酸と融点降下剤としてのエステルを混合したものを使用した。筒状ケース４には、長さ１０ｍｍ、内径１．５ｍｍのセラミックス筒を使用し、封止材５にはエポキシ樹脂を使用した。 In FIG. 1, the outer diameter of the copper lead conductor 1 was 0.6 mmφ, the heel outer diameter was 1.2 mmφ, the heel width was 0.2 mm, and the curvature radius of the heel corner was 80 μm. For the fuse element 2, a BIS alloy wire (Sn: 3%, In: 64%, Bi: 33%, solidus temperature: 70 ° C.) having an outer diameter of 0.6 mmφ and a length of 3 mm is used. In this example, natural rosin mixed with adipic acid and an ester as a melting point depressant was used. A ceramic cylinder having a length of 10 mm and an inner diameter of 1.5 mm was used for the cylindrical case 4, and an epoxy resin was used for the sealing material 5.

〔比較例〕
実施例に対し、リード導体に鍔無しのものを使用した以外、実施例に同じとした。 [Comparative example]
The example was the same as the example except that no lead conductor was used.

実施例及び比較例のそれぞれにつき（ｎ＝５０）、オイルバス中に浸漬し、０．１Ａの電流を通電し、５℃／１分の速度でオイルを昇温して分断温度を測定したところ、実施例品はすべて ℃〜 ℃で動作したが、比較例品でこの温度範囲で動作したものはなく、すべて３℃〜４℃高い温度で動作した。 For each of the examples and comparative examples (n = 50), the oil was immersed in an oil bath, a current of 0.1 A was applied, the oil was heated at a rate of 5 ° C./1 minute, and the cutting temperature was measured. All of the example products operated at a temperature of from ℃ to ℃, but none of the comparative products operated at this temperature range, and all of them operated at a temperature higher by 3 ℃ to 4 ℃.

本発明に係る筒型温度ヒューズの一実施例を示す図面である。1 is a view showing an embodiment of a cylindrical thermal fuse according to the present invention. 本発明に係る筒型温度ヒューズの上記とは別の実施例を示す図面である。It is drawing which shows the Example different from the above of the cylindrical thermal fuse which concerns on this invention. 本発明に係る筒型温度ヒューズの上記とは別の実施例を示す図面である。It is drawing which shows the Example different from the above of the cylindrical thermal fuse which concerns on this invention. 本発明に係る筒型温度ヒューズの上記とは別の実施例を示す図面である。It is drawing which shows the Example different from the above of the cylindrical thermal fuse which concerns on this invention. 従来の筒型温度ヒューズを示す図面である。1 is a view showing a conventional cylindrical temperature fuse.

Explanation of symbols

１リード導体
１１鍔
１２コーナ
１２０鍔後面
２ヒューズエレメント
３フラックス
４筒状ケース
５封止材 1 Lead conductor 11 １２ 12 Corner 120 鍔 Rear surface 2 Fuse element 3 Flux 4 Cylindrical case 5 Sealing material

Claims

A fuse element is connected between opposing lead conductors having a flange at the tip, a flux is applied to the fuse element, a cylindrical case is inserted through the flux-applied fuse element, each end of the cylindrical case and each lead conductor In the thermal fuse formed by sealing the gap between and the heel, at least one of the corner between the heel front surface and the heel outer peripheral surface and the corner between the heel rear surface and the heel outer peripheral surface is a round surface. Characteristic cylindrical thermal fuse.

2. The cylindrical thermal fuse according to claim 1, wherein the radius of curvature of the rounded surface is set to 1/2 to 1/10 of the thickness of the ridge.

3. The cylindrical thermal fuse according to claim 1, wherein a flux is applied so as to be applied to a rear surface of the collar portion.