JP2016162683A - High voltage electric circuit protection fuse - Google Patents
High voltage electric circuit protection fuse Download PDFInfo
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本発明は、例えば電子レンジの高圧電気回路保護用に用いられ、経年特性に優れ、組み立て容易な高圧電気回路保護用ヒューズに関する。 The present invention relates to a fuse for protecting a high voltage electric circuit which is used for protecting a high voltage electric circuit of a microwave oven, has excellent aging characteristics and is easy to assemble.
例えば、電子レンジのマグネトロンの動作電圧は数千キロボルトの高圧電源が使用され、高圧コンデンサーや高圧ダイオード等の他の部品を含め何れかの高圧側回路の部品が短絡した場合に回路を遮断するために高圧電気回路保護用ヒューズが使用される。この場合のヒューズ本体は、ヒューズ可溶体が溶断して切り離されるとき両極に数千キロボルトの高電圧が発生することになり、溶断時に発生するアークエネルギーも過大となるため、素早くアークを切り離すためのばねが使用されており、また、発生した高温のガスに直接接触するヒューズ可溶体を収納する筒体は一般に耐熱ガラス又はセラミック等の耐熱不燃部材が使用される。また、この高圧電気回路保護用ヒューズには配線用の高圧電線が連結され、むき出しになった充電部の絶縁のために一般にはヒューズ本体は、高絶縁に配慮した保護管の内部に納まった状態にされる。 For example, the operating voltage of a microwave oven's magnetron uses a high-voltage power supply of several thousand kilovolts, and shuts down the circuit when any high-voltage side circuit component is short-circuited, including other components such as a high-voltage capacitor and high-voltage diode. A high-voltage electric circuit protection fuse is used. The fuse body in this case will generate a high voltage of several thousand kilovolts on both poles when the fuse fusible material is melted and disconnected, and the arc energy generated at the time of melting will be excessive, so that the arc can be quickly disconnected. A spring is used, and a heat-resistant and non-combustible member such as heat-resistant glass or ceramic is generally used for a cylindrical body that houses a fusible body that directly contacts the generated high-temperature gas. In addition, a high voltage electric wire for wiring is connected to this high voltage electric circuit protection fuse, and in general, the fuse body is housed in a protective tube designed for high insulation in order to insulate exposed live parts. To be.
図５、図６に高圧電気回路保護用ヒューズの構造及びその保護管の従来例を、図７に保護管の別の例をそれぞれ示す。
図５は、特許文献１において従来例として示されているヒューズ本体と保護管からなる高圧電気回路保護用ヒューズを示すものであり、このヒューズ本体３０及び保護管４０においては、一対の口金端子３１−１、３１−２を両端に有する筒状のハウジング３２と、その内部にヒューズ可溶体３４と引張ばね３３と圧着端子３５で構成されるヒューズ本体３０と、このヒューズ本体３０を外部配線に連結するための一対の高圧電線リード３７−１、３７−２と、ヒューズ本体３０を固定し、高圧電線リード３７−１、３７−２とを連結するための一対のヒューズホルダー３６−１、３６−２と、ヒューズ本体３０を保護し、外部環境との絶縁を図るための一対の絶縁体３８−１、３８−２を嵌着した保護管４０により構成される。この絶縁体３８−１、３８−２は一方がメールキャップ、他方が被メールキャップとなりそれぞれの嵌着部に設けられた溝と突起を互いにねじ込むようにして固定される。
5 and 6 show a structure of a high-voltage electric circuit protecting fuse and a conventional example of the protective tube, and FIG. 7 shows another example of the protective tube.
FIG. 5 shows a high-voltage electric circuit protection fuse composed of a fuse body and a protection tube, which is shown as a conventional example in Patent Document 1. In the fuse body 30 and the protection tube 40, a pair of cap terminals 31 is shown. -1 and 31-2 at both ends, a cylindrical housing 32, a fuse body 30 including a fuse fusible body 34, a tension spring 33, and a crimp terminal 35 therein, and the fuse body 30 connected to external wiring A pair of high-voltage wire leads 37-1, 37-2 and a pair of fuse holders 36-1, 36- for fixing the fuse body 30 and connecting the high-voltage wire leads 37-1, 37-2. 2 and a protective tube 40 fitted with a pair of insulators 38-1 and 38-2 for protecting the fuse body 30 and insulating it from the external environment. The insulators 38-1 and 38-2 are fixed so that one is a mail cap and the other is a mail cap, and a groove and a protrusion provided in each fitting portion are screwed together.
しかしながら、この従来例においては、次の問題があった。
（１）引張ばね３３と口金端子３１−１、及びヒューズ可溶体３４と口金端子３１−２はそれぞれ単独に半田付けされており、ヒューズ本体３０と外部引出し用の高圧電線リード３７−１、３７−２を連結するためのヒューズホルダー３６−１、３６−２の各部品が必要となる。
However, this conventional example has the following problems.
(1) The tension spring 33 and the base terminal 31-1, and the fuse fusible body 34 and the base terminal 31-2 are individually soldered, and the fuse body 30 and the high-voltage electric wire leads 37-1 and 37 for external lead-out. 2 is required for connecting the fuse holders 36-1 and 36-2.
（２）ヒューズホルダー３６−１、３６−２はそれぞれ一端にキャップ状のヒューズ嵌合部３６−１ａ、３６−２ａ部を有し口金端子３１−１、３１−２との嵌合信頼性を確保するための高度な寸法管理が必要となる等の欠点があり、また、他方端には外部引き出し用の高圧電線リード３７−１、３７−２の先端の被覆剥離部３７−１ａ、３７−２ａを差し込んで圧着接合するための細長い中空差込部３６−１ｂ、３６−２ｂが必要となる等複雑で高コストの部品となる。 (2) Each of the fuse holders 36-1 and 36-2 has cap-like fuse fitting portions 36-1a and 36-2a at one end, and has a fitting reliability with the cap terminals 31-1 and 31-2. There are drawbacks such as the need for advanced dimensional management to ensure, and the other ends have coating stripping portions 37-1a, 37- at the tips of the external lead-out high-voltage wire leads 37-1, 37-2. It becomes a complicated and high-cost component such that the elongated hollow insertion portions 36-1b and 36-2b for inserting and crimping 2a are required.
（３）ヒューズホルダー３６−１、３６−２との接続のため、高圧電線リード３７−１、３７−２との圧着作業工程及びヒューズ本体３０との嵌合作業工程を必要とし、特にヒューズ本体３０との嵌合では、ハウジング３２は通常ガラス製又はセラミック製であることよりその破損につながりやすい等の欠点がある。 (3) For connection with the fuse holders 36-1, 36-2, a crimping operation process with the high-voltage electric wire leads 37-1, 37-2 and a fitting operation process with the fuse body 30 are required. In the fitting with 30, the housing 32 is usually made of glass or ceramic, and thus has a drawback that it tends to be damaged.
（４）前記（３）項の圧着接続及び嵌合取り付けは何れも単に機械的に接合した状態のため、電気的接合としての品質ばらつきにより、接触不良が起きやすい欠点があり、また、経年的な接続劣化も起きやすい。 (4) Since both the crimping connection and the fitting attachment of the above (3) are simply mechanically joined, there is a defect that contact failure is likely to occur due to the quality variation as electrical joining. Connection deterioration is likely to occur.
（５）引張ばね３３とヒューズ可溶体３４との接続は圧着端子３５で圧着接合されて形成されており、通電のＯＮ−ＯＦＦによる衝撃で接触経時劣化が起きやすい。特に、ヒューズ可溶体３４及び引張りばね３３はそれぞれ極細の単一線で構成されることが一般的で、圧着部は密接の完全性が困難で、通電のＯＮ−ＯＦＦのヒートショックによる経年劣化も発生しやすい。 (5) The connection between the tension spring 33 and the fuse fusible body 34 is formed by crimping and joining with the crimp terminal 35, and contact deterioration with time is likely to occur due to an impact caused by ON-OFF of energization. In particular, the fuse fusible body 34 and the tension spring 33 are generally composed of ultra-thin single wires, and the crimped portion is difficult to be intimately perfect, and aged deterioration due to energized ON-OFF heat shock also occurs. It's easy to do.
（６）ヒューズ本体３０の保護と絶縁のための一対の絶縁体３８−１、３８−２は、一方の絶縁体の嵌合部に突起部を、他方の絶縁体の嵌合部に案内溝部を設け、それに沿って回転させながら嵌め合せる構造の複雑な形状で作られており部品製作が高コストとなる。
また絶縁体３８−１，３８−２は形状的に樹脂成形以外では製作困難で、高圧回路の短絡事故で万一内部のヒューズ本体３０のハウジング３２が破裂した場合に外部の保護管４０が焼損するなどの予期せぬ事故発生に備えて、不燃性のガラスやセラミック等を採用するなどの予防安全処置を採用することは困難で、製作しようとすればさらに高コストとなる。またこれら一対の絶縁体３８−１，３８−２の結合にネジを使用して固定する方法も提案されているが、その組み立てにドライバーを使用するなど作業が非能率的であった。
(6) A pair of insulators 38-1 and 38-2 for protecting and insulating the fuse body 30 includes a protrusion on the fitting portion of one insulator and a guide groove on the fitting portion of the other insulator. And is manufactured in a complicated shape with a structure that fits while rotating along it, which makes the production of parts expensive.
Also, the insulators 38-1 and 38-2 are difficult to manufacture except for resin molding in shape, and if the housing 32 of the internal fuse body 30 is ruptured due to a short circuit accident in the high voltage circuit, the external protective tube 40 is burned out. It is difficult to adopt preventive safety measures such as adopting nonflammable glass or ceramics in preparation for unexpected accidents such as, and if it is going to be manufactured, it will be more expensive. In addition, a method of fixing the pair of insulators 38-1 and 38-2 by using screws has been proposed, but work such as using a screwdriver for the assembly is inefficient.
図６は特許文献１において提案されている従来例を示すものであり、ヒューズ本体５０は両側のヒューズホルダー５１，５２で支持され、一方のヒューズホルダー５２に高圧電線リード５３が接続され、外部配線接続端子５４に接続されている。ヒューズホルダー５２と高圧電線リード５３の接続部は、保護管６０により覆われて保護されている。この従来例に関する技術及び一対のヒューズホルダー５１及び５２を必要とすることは前記図５に記述された内容と同一である。 FIG. 6 shows a conventional example proposed in Patent Document 1, in which a fuse body 50 is supported by fuse holders 51 and 52 on both sides, a high-voltage wire lead 53 is connected to one fuse holder 52, and an external wiring is shown. Connected to the connection terminal 54. The connecting portion between the fuse holder 52 and the high-voltage electric wire lead 53 is covered and protected by a protective tube 60. The technology relating to this conventional example and the need for the pair of fuse holders 51 and 52 are the same as those described in FIG.
図７は、特許文献２において提案されている従来例を示すものであり、絶縁性の軟質材料にて成る半円筒状の下部ヒューズ装着部７３−１と、同じく半円筒状の上部蓋部７３−２有し、これら上下部の端部は開閉自由に動けるように互いに端部で一体に連結された保護管８０の例が示されている。この保護管８０の下部ヒューズ装着部７３−１に、高圧電線リード７２−１、７２−２を圧着固定したヒューズホルダー７１−１、７１−２に両端をそれぞれ連結したヒューズ本体７０を収納して、保護管８０の上下端部に設けられた突起部と係止顎とを嵌め合わせて固定する構造になっている。 FIG. 7 shows a conventional example proposed in Patent Document 2, and includes a semicylindrical lower fuse mounting portion 73-1 made of an insulating soft material and an upper lid portion 73 that is also semicylindrical. -2 and an example of a protective tube 80 is shown in which the upper and lower ends are integrally connected to each other so that they can be freely opened and closed. The fuse body 70 having both ends connected to fuse holders 71-1 and 71-2 in which the high-voltage electric wire leads 72-1 and 72-2 are fixed by crimping is accommodated in the lower fuse mounting portion 73-1 of the protective tube 80. The projections provided on the upper and lower ends of the protective tube 80 and the locking jaws are fitted and fixed.
しかし、この従来例では次のような欠点がある。
（１）電子レンジの高圧回路側は数ｋＶの高圧が印加されるため、充電部と接地金属間の絶縁距離を考慮して設計され、充電部であるヒューズ本体７０及びヒューズホルダー７１−１、７１−２と外部接地金属との絶縁距離は通常は１５ｍｍ程度確保する必要がある。本保護管８０の場合、上下は嵌め合わせて固定されただけの構造のため、合わせ目には少なからず空隙が存在し、ヒューズ本体７０が内部で中央部に固着されていたとしても、外部との絶縁空間距離を１５ｍｍ以上確保するためには、充電部と保護管８０の上下部合わせ目の外面との距離は少なくとも１５ｍｍ必要で、非常に大きい保護管８０となる欠点がある。
肥大化することを防ぐためには、ヒューズ本体７０を保護管８０に収納後、外部より高絶縁性のテープで全体を巻く等の補完絶縁をする必要があり、補完絶縁の材料及びテープ巻きの手間が必要で高コストとなる。
However, this conventional example has the following drawbacks.
(1) Since a high voltage of several kV is applied to the high voltage circuit side of the microwave oven, it is designed in consideration of the insulation distance between the charging part and the ground metal, and the fuse main body 70 and the fuse holder 71-1, which are the charging parts, The insulation distance between 71-2 and the external ground metal is usually required to be about 15 mm. In the case of the present protective tube 80, since the upper and lower portions are simply fitted and fixed, there is not a little gap in the joint, and even if the fuse body 70 is fixed to the center portion inside, In order to secure an insulating space distance of 15 mm or more, the distance between the charging part and the outer surface of the upper and lower joints of the protective tube 80 is required to be at least 15 mm.
In order to prevent the enlargement, it is necessary to perform complementary insulation such as winding the whole body with a highly insulating tape from the outside after the fuse body 70 is housed in the protective tube 80. Is necessary and expensive.
電子レンジ内部での取り付け場所を絶縁距離が確実に確保できる位置に固定して取り付けるなどすれば、補完絶縁の必要はないが、固定用部品と取り付けのコストが必要で、且つ、取り付け場所の制限が必要となるなど非常に不便である。
上述の図７の例では一般的なヒューズホルダーの外径８ｍｍ程度を想定すれば、外部との絶縁空間距離は到底１５ｍｍは確保できていない。
（２）高圧ヒューズ部、ヒューズホルダー部に関する欠点は前記図５の例とほぼ同様である。
If the installation location inside the microwave oven is fixed and installed at a position where the insulation distance can be surely secured, supplementary insulation is not necessary, but fixing parts and installation costs are required, and the installation location is limited. Is very inconvenient.
In the example of FIG. 7 described above, assuming that the outer diameter of a general fuse holder is about 8 mm, the insulation space distance from the outside cannot be secured to 15 mm.
(2) The drawbacks relating to the high-voltage fuse part and fuse holder part are almost the same as in the example of FIG.
電流ヒューズは一般に通電のジュール熱により応動する装置で、その発熱量は電流の二乗×ヒューズ内部抵抗に比例する。したがって外部配線取り出し部を含めた内部抵抗の変動はヒューズの特性のばらつきに直結し、経年劣化の要因となるため、できるだけ小さく安定させる必要がある。 A current fuse is generally a device that responds to energized Joule heat, and the amount of heat generated is proportional to the square of the current times the fuse internal resistance. Therefore, fluctuations in internal resistance including the external wiring lead-out portion are directly connected to variations in fuse characteristics and cause deterioration over time. Therefore, it is necessary to stabilize as small as possible.
本発明は、前述した従来技術の導体間の接続に関する問題点を解決するために案出されたもので、各導体間の連結に関して圧接などの機械接合を採用せず、接触抵抗をほとんど零に抑えて経年信頼性が高い高圧電気回路保護用ヒューズを提供することを第１の目的とする。
また、ヒューズホルダーを使用せず、簡素な構造の保護管とすることにより、組み立て容易で低コストの高圧電気回路保護用ヒューズを提供することを第２の目的とする。
さらに、電子レンジの回路条件によっては回路の短絡時に内部ヒューズの筒状ハウジングが破損するなどの異常事態が想定されるような場合には、発生するアークや飛散する溶解金属に直接接触する近接の外部絶縁体で保護できるようにするため、保護管の絶縁体をガラスやセラミック等、耐熱性で不燃性の材料とすることが容易に実施できる構造とすることを第３の目的とする。
The present invention has been devised to solve the problems related to the connection between the conductors of the prior art described above, and does not employ mechanical bonding such as pressure welding for the connection between the conductors, and makes the contact resistance almost zero. A first object is to provide a fuse for protecting a high-voltage electric circuit that is suppressed and has high aging reliability.
It is a second object of the present invention to provide a fuse for protecting a high-voltage electric circuit that is easy to assemble and low in cost by using a simple structure protective tube without using a fuse holder.
In addition, depending on the circuit conditions of the microwave oven, if an abnormal situation is assumed such as the cylindrical housing of the internal fuse being damaged when the circuit is short-circuited, the proximity of the direct contact with the arc generated or the molten metal scattered In order to be able to protect with an external insulator, a third object is to provide a structure in which the insulator of the protective tube can be easily made of a heat-resistant and non-combustible material such as glass or ceramic.
前掲の課題を解決するため、本発明の高圧電気回路保護用ヒューズの第１の構成は、一対の口金端子を両端に有する筒状の絶縁性ハウジングと、該ハウジング内部にヒューズ可溶体と該ヒューズ可溶体の溶断時に溶断面を瞬時に遠く切り離すための引張ばねとを連結架張して構成されるヒューズ本体と、このヒューズ本体に接続した外部引出し用の高圧電線リードと、前記ヒューズ本体を保護及び外部絶縁するための筒状の保護管とを備えた高圧ヒューズにおいて、前記ヒューズ可溶体及び引張ばねの端末を前記一対の口金端子の底部中央部に設けた孔よりそれぞれ外部に引き出し、それぞれの端末と前記高圧電線リード及び口金端子とを一体的に溶接又はロウ接合したことを特徴とする。
本発明の第２の構成は、第１の構成において、前記ヒューズ可溶体と引張ばねとの連結において、引張ばね端末に設けたフック部にヒューズ可溶体を巻きつけて固定した状態で溶接又はロウ接により接合したことを特徴とする。
本発明の第３の構成は、第１又は第２の構成において、前記筒状の保護管は、筒状の絶縁管の両端の開口部に、中心に外部引出し用の前記高圧電線リードを貫通させるための孔を有するキャップが固着されていることを特徴とする。
本発明の第４の構成は、第１ないし第３の構成において、前記筒状の保護管は、透明のガラス管又はセラミック管からなることを特徴とする。
In order to solve the above-mentioned problems, a first configuration of the fuse for protecting a high-voltage electric circuit according to the present invention includes a cylindrical insulating housing having a pair of base terminals at both ends, a fuse fusible body and the fuse inside the housing. A fuse body constructed by connecting and stretching a tension spring for instantly separating the melted section when the meltable body is melted, a high-voltage wire lead for external lead connected to the fuse body, and protecting the fuse body And a high-temperature fuse having a cylindrical protective tube for external insulation, the fuse fusible body and the end of the tension spring are respectively drawn out from the holes provided in the center of the bottom of the pair of base terminals. The terminal, the high-voltage electric wire lead and the cap terminal are integrally welded or brazed.
According to a second configuration of the present invention, in the first configuration, in the connection between the fuse fusible body and the tension spring, the fuse fusible body is wound and fixed in a state where the fuse fusible body is wound around the hook portion provided at the end of the tension spring. It is characterized by being joined by contact.
According to a third configuration of the present invention, in the first or second configuration, the cylindrical protective tube passes through the high-voltage electric wire lead for external drawing in the center at the openings at both ends of the cylindrical insulating tube. A cap having a hole for making it adhere is fixed.
According to a fourth configuration of the present invention, in the first to third configurations, the cylindrical protective tube is made of a transparent glass tube or a ceramic tube.
本発明においては、外部引出し用の高圧電線リードとヒューズ本体の口金とヒューズ可溶体の連結、外部引出し用の高圧電線リードとヒューズ本体の口金と引張バネの連結、及び引張バネとヒューズ可溶体の各導電体の連結に関して、機械的圧接がなく、すべて溶接又はロウ接合とすることにより第１の目的が達成される。
また、前項の手段により連結用ホルダー部品を使用せず、また、保護管の絶縁体の構造を、安価で容易に市場で入手可能な簡素なパイプ状の形状にし、両端末を軽量で簡素な形状のキャップで封止した保護管とすることにより第２の目的が達成される。
さらに、保護管の絶縁体を前項に記すように簡素なパイプ状の形態にすることにより、ガラス管又はセラミック管を使用することが可能となり、第３の目的が達成される。
このように、本発明によれば、低コストで容易に製造され、経年特性に優れた高圧電気回路保護用ヒューズ、特に電子レンジ用に適したヒューズが提供される。
In the present invention, the connection between the high-voltage electric wire lead for external drawing and the base of the fuse body and the fuse fusible body, the connection between the high-voltage electric wire lead for external drawing and the base of the fuse main body and the tension spring, and the tension spring and the fuse fusible body Regarding the connection of each conductor, there is no mechanical pressure welding, and the first object is achieved by all welding or brazing.
In addition, by using the means described in the previous section, the connection holder parts are not used, and the structure of the protective tube insulator is made into a simple pipe-like shape that is cheap and easily available on the market, making both terminals light and simple. The second object is achieved by using a protective tube sealed with a cap having a shape.
Furthermore, by making the insulator of the protective tube into a simple pipe shape as described in the previous section, it becomes possible to use a glass tube or a ceramic tube, and the third object is achieved.
Thus, according to the present invention, a fuse for protecting a high-voltage electric circuit, particularly a fuse suitable for a microwave oven, which is easily manufactured at low cost and has excellent aging characteristics is provided.
以下、本発明の実施の形態に係る高圧電気回路保護用ヒューズを、図１から図４に基いて説明する。 Hereinafter, a fuse for protecting a high-voltage electric circuit according to an embodiment of the present invention will be described with reference to FIGS.
図１は、本発明の実施の形態に係る高圧電気回路保護用ヒューズの全体図であり、一対の口金端子１−１、１−２を両端に有する筒状のハウジング２と、ヒューズ可溶体３とこれに連結架張され可溶体の溶断時に溶断面を瞬時に遠く切り離すための引張ばね４と、外部引出し用の高圧電線リード５−１、５−２とで構成されるヒューズ本体１０と、ヒューズ本体１０を保護及び外部絶縁するための筒状の絶縁体７と、その両端に接着するなどの方法で固定された一対のキャップ８−１、８−２とで構成される保護管２０を備えた高圧電気回路保護用ヒューズを示すものである。このヒューズは電子レンジの電気回路保護用に好適に利用することができ、そのような用途では、遮断時のアークの発生を減少させるために、ハウジング２の内部空隙をシリカ粒等の消弧材で充填することも容易に実施可能である。 FIG. 1 is an overall view of a high-voltage electrical circuit protection fuse according to an embodiment of the present invention, a cylindrical housing 2 having a pair of cap terminals 1-1 and 1-2 at both ends, and a fuse fuse 3 And a fuse body 10 composed of a tension spring 4 that is connected and stretched to the fuser body 4 to disconnect the melted section instantaneously and far away when the fusible member is melted, and high-voltage electric wire leads 5-1 and 5-2 for external drawing, A protective tube 20 comprising a cylindrical insulator 7 for protecting and externally insulating the fuse body 10 and a pair of caps 8-1 and 8-2 fixed by bonding to both ends thereof. 1 shows a high-voltage electric circuit protection fuse provided. This fuse can be suitably used for protecting an electric circuit of a microwave oven. In such an application, an arc extinguishing material such as silica particles is formed in the internal space of the housing 2 in order to reduce the occurrence of an arc when interrupted. Filling with can also be easily performed.
図２に示すように、引張ばね４の端部に設けたフック４ａを口金端子１−１の孔１−１ａより外部に引き出し、このフック４ａを口金端子の孔１−１ａに引っ掛け、外部引出し用の高圧電線リード５−１の先端被覆剥離部５−１ａを口金端子１−１の中央部に突き当て、引張ばね４、口金端子１−１及び高圧電線リード５−１を同時一体的に半田６−１により接合した。 As shown in FIG. 2, the hook 4a provided at the end of the tension spring 4 is pulled out from the hole 1-1a of the base terminal 1-1, and this hook 4a is hooked into the hole 1-1a of the base terminal 1-1 so as to be pulled out to the outside. The high-voltage wire lead 5-1 is covered with the tip coating peeling portion 5-1 a against the center of the base terminal 1-1, and the tension spring 4, the base terminal 1-1, and the high-voltage wire lead 5-1 are integrated simultaneously. It joined by solder 6-1.
さらに、図３に示すように、引張ばね４の端部に設けたフック４ｂにヒューズ可溶体３の端部を数回巻きつけ、さらにその上から半田６−２により接合した。 Further, as shown in FIG. 3, the end of the fuse fusible body 3 was wound around the hook 4b provided at the end of the tension spring 4 several times, and further joined by solder 6-2 from above.
図４に示されるように、ヒューズ可溶体３の端末を口金端子１−２の孔１−２ａより外部に引き出し、外部引出し用の高圧電線リード５−２の先端被覆剥離部５−２ａを口金端子１−２の中央部に突き当て、ヒューズ可溶体３端末と口金端子１−２及び高圧電線リード５−２を同時一体的に半田６−３により接合した。 As shown in FIG. 4, the end of the fuse fusible body 3 is pulled out from the hole 1-2a of the base terminal 1-2, and the tip cover peeling portion 5-2a of the high voltage electric wire lead 5-2 for external lead is connected to the base. The fuse fusible body 3 terminal, the cap terminal 1-2, and the high-voltage electric wire lead 5-2 were joined simultaneously and integrally with the solder 6-3 by abutting against the center of the terminal 1-2.
本実施の形態は、以上のように構成することにより、次の効果を奏する。
（１）外部引出用の高圧電線リード５−１，５−２とヒューズ口金端子１−１，１−２とヒューズ可溶体３の連結（連結部Ｐ−１，Ｐ−３）、ヒューズ可溶体３と引張ばね４の連結（連結部Ｐ−２）、及び引張ばね４と外部引出用の高圧電線リード５−１，５−２の連結（図２，図４参照）のすべての導電体の連結に機械的接合がなく、電気的に接触抵抗のほとんどない溶接又はロウ接で接合することにより、安定した品質特性の電子レンジ用ヒューズを提供することができる。また、各導体間の接続において電気的接触抵抗がほとんどなく、経年的に接触抵抗が徐々に増加することがないので、経年劣化による不必要な溶断に対する予防として効果が見込める。
This embodiment has the following effects when configured as described above.
(1) Connection of high voltage electric wire leads 5-1 and 5-2 for external lead-out, fuse base terminals 1-1 and 1-2 and fuse fusible body 3 (connecting portions P-1 and P-3), fuse fusible body 3 and the tension spring 4 (connection part P-2), and the connection of the tension spring 4 and the high-voltage electric wire leads 5-1 and 5-2 for external drawing (see FIGS. 2 and 4) By connecting by welding or brazing without mechanical contact in connection and having almost no electrical contact resistance, it is possible to provide a microwave oven fuse having stable quality characteristics. Moreover, since there is almost no electrical contact resistance in the connection between each conductor and a contact resistance does not increase gradually with the passage of time, an effect can be expected as prevention against unnecessary fusing due to deterioration over time.
（２）導電体の連結が機械接合だけの場合は、かなりの圧力で圧接しなければ接触抵抗にばらつきが発生しやすく、それでもほとんど零にすることは困難で、特に通電のＯＮ−ＯＦＦによるヒートショックに伴う接触面の経年劣化により接触抵抗が増加していく。本実施の形態によれば、前項に説明したように接触抵抗はほとんど零に等しく、したがって、各導電体の連結部のヒートショックによる接触抵抗の経年変化はほとんどなく、経年信頼性に優れた電子レンジ用ヒューズを提供することができる。 (2) When the conductors are connected only by mechanical joining, the contact resistance is likely to vary unless they are pressed by a considerable pressure, and it is still difficult to make the resistance almost zero. Contact resistance increases due to aging of the contact surface due to shock. According to the present embodiment, as described in the previous section, the contact resistance is almost equal to zero. Therefore, there is almost no secular change of the contact resistance due to the heat shock of the connecting portion of each conductor, and the electron having excellent aging reliability. A range fuse can be provided.
（３）外部引出用の高圧電線リード５−１，５−２を直接口金端子１−１，１−２に接続することにより、ヒューズホルダー等の取付用の部材が不要となり、その組立取付費用も含めて節約でき低コストが実現できる。また、ヒューズホルダー部分の長さが不要となり、ヒューズ全長の長さを短縮でき小型化が可能となる。 (3) By connecting the high-voltage electric wire leads 5-1 and 5-2 for external drawing directly to the cap terminals 1-1 and 1-2, a member for mounting such as a fuse holder becomes unnecessary, and its assembly and installation cost Can be saved and low cost can be realized. In addition, the length of the fuse holder portion is not required, and the length of the entire fuse can be shortened and the size can be reduced.
（４）ヒューズ本体１０を保護及び外部絶縁するための保護管２０において、ヒューズ本体１０の絶縁体部を安価で容易に市場で入手可能な単純パイプ形状とし、その両端末を軽量で単純な形状のキャップ８−１，８−２を固定した構造とすることにより、簡素で安価な保護管２０の製作が可能となり、必要に応じてパイプ状絶縁体７をガラス又はセラミックで製作することも容易に可能となる。 (4) In the protective tube 20 for protecting and externally insulating the fuse body 10, the insulator portion of the fuse body 10 is formed into a simple pipe shape that can be easily obtained at a low cost, and both ends thereof are light and simple in shape. The structure in which the caps 8-1 and 8-2 are fixed makes it possible to manufacture a simple and inexpensive protective tube 20, and the pipe-like insulator 7 can be easily made of glass or ceramic as necessary. It becomes possible.
本発明は、各導体間の連結に関して圧接などの機械接合を採用せず、接触抵抗をほとんど零に抑えた経年信頼性が高い高圧電気回路保護用ヒューズとして、電子レンジ等の高圧回路保護に好適に用いることができる。 The present invention is suitable for high voltage circuit protection such as a microwave oven as a fuse for high voltage electrical circuit protection with high aging reliability that does not employ mechanical bonding such as pressure welding for connection between conductors and suppresses contact resistance to almost zero. Can be used.
１０ ヒューズ本体
２０ 保護管
１−１，１−２ 口金端子
１−１ａ 孔
２ ハウジング
３ ヒューズ可溶体
４ 引張ばね
４ａ，４ｂ フック
５−１，５−２ 高圧電線リード
５−１ａ 先端被覆剥離部
６−１，６−２ 半田
７ 絶縁体
８−１，８−２キャップ
Ｐ−１，Ｐ−２，Ｐ−３ 連結部
DESCRIPTION OF SYMBOLS 10 Fuse main body 20 Protection tube 1-1, 1-2 Cap terminal 1-1a Hole 2 Housing 3 Fuse fusible body 4 Tension spring 4a, 4b Hook 5-1, 5-2 High voltage electric wire lead 5-1a End coating peeling part 6 -1,6-2 Solder 7 Insulator 8-1, 8-2 Cap P-1, P-2, P-3 Connecting part
Claims (4)
該ハウジング内部にヒューズ可溶体と該ヒューズ可溶体の溶断時に溶断面を瞬時に遠く切り離すための引張ばねとを連結架張して構成されるヒューズ本体と、
このヒューズ本体に接続した外部引出し用の高圧電線リードと、
前記ヒューズ本体を保護及び外部絶縁するための筒状の保護管とを備えた高圧電気回路保護用ヒューズにおいて、
前記ヒューズ可溶体及び引張ばねの端末を前記一対の口金端子の底部中央部に設けた孔よりそれぞれ外部に引き出し、それぞれの端末と前記高圧電線リード及び口金端子とを一体的に溶接又はロウ接合したことを特徴とする高圧電気回路保護用ヒューズ。 A cylindrical insulating housing having a pair of cap terminals at both ends;
A fuse body constituted by connecting and stretching a fuse fusible body and a tension spring for instantaneously separating the melted section when the fuse fusible body is blown,
High-voltage wire lead for external lead connected to the fuse body,
In the fuse for high-voltage electric circuit protection provided with a cylindrical protective tube for protecting and externally insulating the fuse body,
The fuse fusible body and the terminal of the tension spring are pulled out to the outside from the holes provided at the center of the bottom of the pair of base terminals, respectively, and each terminal and the high-voltage wire lead and the base terminal are integrally welded or brazed. A fuse for protecting a high voltage electrical circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015042667A JP2016162683A (en) | 2015-03-04 | 2015-03-04 | High voltage electric circuit protection fuse |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015042667A JP2016162683A (en) | 2015-03-04 | 2015-03-04 | High voltage electric circuit protection fuse |
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| JP2016162683A true JP2016162683A (en) | 2016-09-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110277744A (en) * | 2019-06-21 | 2019-09-24 | 许继电气股份有限公司 | The contact apparatus and handcart circuit breaker of handcart circuit breaker |
| WO2020112031A1 (en) * | 2018-11-29 | 2020-06-04 | Razvojni Center Enem Novi Materiali D.O.O. | Electro thermal fuse |
-
2015
- 2015-03-04 JP JP2015042667A patent/JP2016162683A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020112031A1 (en) * | 2018-11-29 | 2020-06-04 | Razvojni Center Enem Novi Materiali D.O.O. | Electro thermal fuse |
| CN110277744A (en) * | 2019-06-21 | 2019-09-24 | 许继电气股份有限公司 | The contact apparatus and handcart circuit breaker of handcart circuit breaker |
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