JP4878331B2 - Electrical contact opening / closing part - Google Patents

Electrical contact opening / closing part Download PDF

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JP4878331B2
JP4878331B2 JP2007126739A JP2007126739A JP4878331B2 JP 4878331 B2 JP4878331 B2 JP 4878331B2 JP 2007126739 A JP2007126739 A JP 2007126739A JP 2007126739 A JP2007126739 A JP 2007126739A JP 4878331 B2 JP4878331 B2 JP 4878331B2
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fixed contact
contact
yoke
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JP2008282719A (en
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茂 葛西
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Tokin Corp
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NEC Tokin Corp
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Description

本発明は電磁リレーに関し、特に高容量負荷開閉を行うための電磁リレーの電気接点開閉部に関する。   The present invention relates to an electromagnetic relay, and more particularly, to an electrical contact switching part of an electromagnetic relay for performing high capacity load switching.

従来の高容量負荷開閉を行うための電磁リレーでは、接点開閉時に接点消耗を引き起こすアークを短時間に消滅させるため、磁気吹消形接点開閉部が使用されている。   In a conventional electromagnetic relay for performing high-capacity load switching, a magnetic blow-off type contact switching unit is used in order to extinguish an arc that causes contact consumption when the contact is opened and closed in a short time.

図６は、特許文献１に開示された従来の磁気吹消形接点開閉部の一例を示す。図６（ａ）は、それぞれ両面に接点を有する２つの可動接触子３９、４９をそれぞれ保持した２個の電磁アクチュエータの間に設置される固定接点端子ブロック３１の斜視図、図６（ｂ）は、その正面図である。この固定接点端子ブロック３１は、２組の固定接点端子５１、５２をプラスチック部材３２により一体成型しており、そのプラスチック部材３２の両側にマグネット部材４６を備えている。そのマグネット部材４６による磁力線３８、４８の方向は、固定接点端子５１、５２の接点３４、３５、４４、４５と可動接触子３９、４９の接点との間の空隙において両接点が対峙する方向に対して垂直になっている。   FIG. 6 shows an example of a conventional magnetic blow-off type contact opening / closing part disclosed in Patent Document 1. FIG. 6A is a perspective view of a fixed contact terminal block 31 installed between two electromagnetic actuators each holding two movable contacts 39 and 49 each having a contact on both surfaces, and FIG. 6B. Is a front view thereof. The fixed contact terminal block 31 is formed by integrally molding two sets of fixed contact terminals 51 and 52 with a plastic member 32, and includes magnet members 46 on both sides of the plastic member 32. The direction of the magnetic lines of force 38 and 48 by the magnet member 46 is such that both contacts are opposed to each other in the gap between the contacts 34, 35, 44 and 45 of the fixed contact terminals 51 and 52 and the contacts of the movable contacts 39 and 49. It is perpendicular to it.

本構造において、負荷を遮断したとき固定接点端子の接点３５と可動接触子３９の片側の接点との間の空隙部、および固定接点端子の接点４５と可動接触子４９の片側の接点との間の空隙部にアーク３０、４０がそれぞれ発生すると、それらのアークは磁場方向およびアーク電流方向の双方に垂直な方向へローレンツ力を受け伸長する。したがって、この伸長によりアークの消滅が促進されるため、磁場が無い場合に比べ、遮断性能は向上する。このように磁気吹消形接点開閉部は、接点間空隙により決定される負荷電圧、電流の遮断性能を向上させるものである。ここで負荷とは具体的には直流負荷や交流負荷、およびモータ負荷等の電気信号である。   In this structure, when the load is interrupted, a gap between the contact 35 of the fixed contact terminal and the contact on one side of the movable contact 39 and between the contact 45 of the fixed contact terminal and the contact on one side of the movable contact 49 are provided. When the arcs 30 and 40 are generated in the gaps, the arcs are extended by receiving a Lorentz force in a direction perpendicular to both the magnetic field direction and the arc current direction. Therefore, the extinction of the arc is promoted by this elongation, so that the interruption performance is improved as compared with the case where there is no magnetic field. Thus, the magnetic blow-off type contact opening / closing part improves the load voltage and current interruption performance determined by the gap between the contacts. Here, the load is specifically an electric signal such as a DC load, an AC load, and a motor load.

実開平５−３１０８２号公報Japanese Utility Model Publication No. 5-31082

従来の磁気吹消形接点開閉部においては、次のような課題があった。第１に、接点部周囲に隣接する他部材への極度のア−ク飛散を防止するため、特定方向についてア−クが伸長する空間を確保する必要があった。そのため、デバイスの幾何学的寸法の設計において大きな制約が生じ、デバイス自体が大型化してしまい、逆に小型化を優先させた場合、遮断性能が低下してしまうという課題があった。第２に、遮断する負荷の電流の極性により、ア−クの伸長方向が決定されてしまうため、遮断性能が負荷の電流の極性によって制限されていた。   The conventional magnetic blow-off type contact opening / closing part has the following problems. First, in order to prevent extreme arc scattering to other members adjacent to the periphery of the contact portion, it is necessary to secure a space in which the arc extends in a specific direction. For this reason, there is a problem in that the design of the device geometric dimensions is greatly restricted, the device itself is enlarged, and conversely, when downsizing is prioritized, the blocking performance is lowered. Secondly, since the arc extension direction is determined by the polarity of the load current, the breaking performance is limited by the polarity of the load current.

そこで本発明の課題は、アークの特定方向への飛散を制限し、デバイスの小型化が可能で、かつ負荷の極性による影響がなく、遮断特性の良好な磁気吹消形の電気接点開閉部を提供することにある。   Therefore, an object of the present invention is to provide a magnetic blow-off type electrical contact switching unit that limits the scattering of the arc in a specific direction, enables the downsizing of the device, is not affected by the polarity of the load, and has a good breaking characteristic. There is to do.

上記課題を解決するため、本発明の電気接点開閉部は、２つの固定接点構造体と、該２つの固定接点構造体を併置し保持する絶縁ホルダと、可動接点構造体と、前記固定接点構造体にそれぞれ接続された２つの固定導電端子とからなる電気接点開閉部において、前記固定接点構造体は、筒形状を有し該筒形状の一方の先端面を固定接点とし、他方の端部に突起部を有する固定接点端子と、円筒形状部分と底面部を有し、前記円筒形状部分の内部に前記固定接点端子を内包し、前記底面部に前記突起部に嵌合する穴を有する継鉄と、該継鉄の前記円筒形状部分の内面に配置される永久磁石と、前記固定接点端子の筒形状の内部に配置され前記継鉄の前記底面部の中央部に接合した略円柱状の補助継鉄とからなり、前記絶縁ホルダは、前記永久磁石と前記継鉄を配置するための略円柱形状の溝部を有し、前記固定接点端子の前記固定接点の周辺部分を空隙を介して内包し、前記固定導電端子は前記固定接点端子との間に前記継鉄の前記底面部を挟み込んで前記固定接点端子の突起部に嵌合する構造を有し、前記可動接点構造体は、前記固定接点と類似の断面形状を有する筒形状を有し前記固定接点と各々空隙を介して対向配置した２つの可動接点と、両端部に前記２つの可動接点が配置され中央部に嵌合穴が設けられた可動板と、該可動板に前記嵌合穴により接合され前記固定接点端子の筒形状の中心線に対して略平行方向へ変位する可動棒とを具備し、前記可動接点と前記固定接点の空隙領域において前記中心線に対して略垂直で、かつ前記中心線に向かう方向または、前記中心線から放射する方向の磁力線を発生させることを特徴とする。   In order to solve the above-described problems, an electrical contact switching unit according to the present invention includes two fixed contact structures, an insulating holder that holds the two fixed contact structures in parallel, a movable contact structure, and the fixed contact structure. In the electrical contact opening / closing part comprising two fixed conductive terminals respectively connected to the body, the fixed contact structure has a cylindrical shape, and one end surface of the cylindrical shape is a fixed contact, and the other end is A fixed contact terminal having a projection, a yoke having a cylindrical portion and a bottom portion, enclosing the fixed contact terminal inside the cylindrical portion, and having a hole that fits into the projection on the bottom portion And a permanent magnet disposed on the inner surface of the cylindrical portion of the yoke, and a substantially columnar auxiliary disposed inside the cylindrical shape of the fixed contact terminal and joined to the center of the bottom surface of the yoke The insulating holder comprises the permanent magnet. And a substantially cylindrical groove portion for disposing the yoke, enclosing a peripheral portion of the fixed contact of the fixed contact terminal via a gap, and the fixed conductive terminal between the fixed contact terminal The movable contact structure has a cylindrical shape having a cross-sectional shape similar to that of the fixed contact, and has a structure in which the bottom surface portion of the yoke is sandwiched and fitted into a protrusion of the fixed contact terminal. Two movable contacts disposed opposite to each other via a gap, a movable plate having the two movable contacts disposed at both ends and having a fitting hole in the center, and the movable plate by the fitting hole A movable bar that is joined and displaced in a direction substantially parallel to the cylindrical center line of the fixed contact terminal, and is substantially perpendicular to the center line in the gap region of the movable contact and the fixed contact; and The direction toward the center line or the center line And wherein the generating the direction of lines of magnetic force emitted.

ここで、前記永久磁石は扇形の断面形状を有する複数の永久磁石から構成されていてもよい。   Here, the said permanent magnet may be comprised from the some permanent magnet which has a fan-shaped cross-sectional shape.

また、前記固定接点は前記固定接点端子の他の部分とは異なる金属を前記固定接点端子の先端部に接合配置して形成しても良い。   Further, the fixed contact may be formed by joining and disposing a metal different from other portions of the fixed contact terminal at the tip end portion of the fixed contact terminal.

上述のような構成により、本発明の電気接点開閉部では、可動接点と固定接点の相対峙する筒形状の先端が円輪状の場合、その円輪形状の接点接触部にアークが発生した場合、上記永久磁石と継鉄および補助継鉄により発生する磁場による磁力線でロ−レンツ力がアークに作用し、接点の上記円輪形状に沿ってアークが回転運動する。この回転運動は、アークを熱的に不安定にさせることから、アークの維持が困難となり、遮断性能が向上する。アークの運動は回転運動であるため、特定方向へアークが飛散せず、必要最低限のアーク飛散空間だけを確保するだけでよい。つまり、有効にデバイスの幾何学寸法を設計することができ、小型化が可能となる。   With the configuration as described above, in the electrical contact opening and closing part of the present invention, when the cylindrical tip where the movable contact and the stationary contact are opposed to each other is an annular shape, when an arc occurs in the annular contact point part, A Lorentz force acts on the arc by magnetic lines generated by the magnetic fields generated by the permanent magnet, the yoke and the auxiliary yoke, and the arc rotates along the ring shape of the contact. Since this rotational motion makes the arc thermally unstable, it becomes difficult to maintain the arc and the interruption performance is improved. Since the movement of the arc is a rotational movement, the arc does not scatter in a specific direction, and it is only necessary to ensure a minimum arc scatter space. That is, the device geometric dimensions can be designed effectively, and miniaturization becomes possible.

また、負荷の極性が変わった場合、アークの回転する方向が反転するだけであり、負荷極性に依存しない遮断特性となる。   Further, when the polarity of the load changes, only the direction of rotation of the arc is reversed, and the interruption characteristic does not depend on the load polarity.

また、可動接点と固定接点の円輪形接点接触部に作用する磁界の発生のために、永久磁石のみならず、継鉄および補助継鉄を設置していることから、磁場発生機構の小型化が可能となる。   In addition, not only permanent magnets but also yokes and auxiliary yokes are installed to generate a magnetic field that acts on the ring-shaped contact point between the movable and fixed contacts. It becomes possible.

さらに、固定接点端子の他の部分とは異なる材料の筒形状先端部を有した固定接点を、固定接点端子先端に配置し、可動接点と対向させることで、接点材料選択の幅が広がり、より高い遮断性能が実現可能となる。   Furthermore, by arranging a fixed contact with a cylindrical tip of a material different from the other parts of the fixed contact terminal at the tip of the fixed contact terminal and facing the movable contact, the range of contact material selection is expanded. High shut-off performance can be realized.

以上のように、本発明によりアークの特定方向への飛散を制限し、デバイスの小型化が可能で、かつ負荷の極性による影響がなく、遮断特性の良好な磁気吹消形の電気接点開閉部が得られる。   As described above, according to the present invention, it is possible to limit the scattering of the arc in a specific direction, to reduce the size of the device, and not to be affected by the polarity of the load, and to provide a magnetic blow-off type electric contact switching unit having a good breaking characteristic. can get.

次に、本発明の実施の形態を図面に基づいて説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の実施例１に係る電気接点開閉部の縦断面図である。図２は、図１におけるＡ−Ａ断面図である。図３は、実施例１の部品別展開斜視図である。図４は実施例１における遮断時の負荷極性の一例を示す図である。図５は図４の点線部に示す１つの接点組におけるアーク挙動を説明した図である。以下、これらの図面に基づき説明する。   FIG. 1 is a longitudinal sectional view of an electrical contact switching part according to Example 1 of the present invention. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a developed perspective view of each part according to the first embodiment. FIG. 4 is a diagram illustrating an example of load polarity at the time of interruption in the first embodiment. FIG. 5 is a diagram for explaining the arc behavior in one contact set shown by the dotted line in FIG. Hereinafter, description will be given based on these drawings.

図１および図３において、本電気接点開閉部は、２つの固定接点構造体２１および２２と、固定接点構造体２１および２２を併置し保持する絶縁ホルダ６と、可動接点構造体２３と、前記固定接点構造体にそれぞれ接続された２つの固定導電端子１とからなり、固定接点構造体２１および２２は、それぞれ円筒形状を有しその円筒形状の一方の先端面を固定接点１０とし、他方の端部に突起部２５を有する固定接点端子２と、円筒形状部分６０と底面部６１を有し、円筒形状部分６０の内部に固定接点端子２を内包し、底面部６１に突起部２５に嵌合する穴６２を有する継鉄３と、継鉄３の円筒形状部分６０の内面に配置される永久磁石４と、固定接点端子２の円筒形状の内部に配置され継鉄３の底面部６１の中央部に接合した円柱状の補助継鉄９とからなっている。継鉄３および補助継鉄９は永久磁石４からの磁束を有効に接点部へ印加するために設置されている。また、永久磁石４は扇形の断面形状を有する複数の永久磁石からなっている。   1 and 3, the electrical contact switching unit includes two fixed contact structures 21 and 22, an insulating holder 6 that holds the fixed contact structures 21 and 22 in parallel, the movable contact structure 23, Each of the fixed contact structures 21 and 22 has a cylindrical shape, and one end surface of the cylindrical shape is used as the fixed contact 10 and the other of the fixed contact structures 21 and 22 is connected to the fixed contact structure. The fixed contact terminal 2 having the protruding portion 25 at the end, the cylindrical portion 60 and the bottom surface portion 61, the fixed contact terminal 2 is included inside the cylindrical portion 60, and the protruding portion 25 is fitted to the bottom surface portion 61. The yoke 3 having a hole 62 to be joined, the permanent magnet 4 disposed on the inner surface of the cylindrical portion 60 of the yoke 3, and the bottom surface portion 61 of the yoke 3 disposed inside the cylindrical shape of the fixed contact terminal 2. A cylindrical auxiliary joined to the center It is made from iron 9. The yoke 3 and the auxiliary yoke 9 are installed in order to effectively apply the magnetic flux from the permanent magnet 4 to the contact portion. The permanent magnet 4 is composed of a plurality of permanent magnets having a fan-shaped cross-sectional shape.

絶縁ホルダ６は、略箱型形状で、底部に２つの固定接点端子２を配置するための貫通穴、および永久磁石４と継鉄３を配置するための円柱形状の溝部６３を有し、固定接点端子２の固定接点１０の周辺部分を空隙を介して内包するような形状であり、アークによる金属部材の損傷を防護する機能を持っている。   The insulating holder 6 has a substantially box shape, has a through hole for arranging the two fixed contact terminals 2 at the bottom, and a cylindrical groove 63 for arranging the permanent magnet 4 and the yoke 3 and is fixed. The contact terminal 2 has a shape that encloses the peripheral portion of the fixed contact 10 via a gap, and has a function of protecting the metal member from being damaged by an arc.

外部への信号取り出し用の固定導電端子１は固定接点端子２との間に継鉄３の底面部６１を挟み込んで固定接点端子２の突起部２５に嵌合する構造を有している。   The fixed conductive terminal 1 for taking out signals to the outside has a structure in which the bottom surface portion 61 of the yoke 3 is sandwiched between the fixed conductive terminal 1 and the fixed contact terminal 2 and is fitted to the protruding portion 25 of the fixed contact terminal 2.

可動接点構造体２３は、固定接点１０と類似の断面形状を有する円筒形状を有し固定接点１０と各々空隙を介して対向配置した２つの可動接点５と、両端部に２つの可動接点５が配置され中央部に嵌合穴７０が設けられた可動板７と、可動板７に嵌合穴７０により接合され固定接点端子２の円筒形状の中心線１００に対してほぼ平行に変位する可動棒８とを具備している。   The movable contact structure 23 has a cylindrical shape having a cross-sectional shape similar to that of the fixed contact 10, two movable contacts 5 arranged to face the fixed contact 10 through gaps, and two movable contacts 5 at both ends. The movable plate 7 which is disposed and provided with a fitting hole 70 in the center, and the movable rod which is joined to the movable plate 7 by the fitting hole 70 and is displaced substantially parallel to the cylindrical center line 100 of the fixed contact terminal 2. 8 and.

永久磁石４は上述のように扇型断面形状を有し、継鉄３との接触面および、その反対面が着磁処理してある。絶縁ホルダ６の溝部６３に継鉄３とともに配置され、接点接触部に磁力線を与える。この永久磁石４による磁力線の方向は固定接点端子２の中心線１００側へ向かう方向、または固定接点端子２の中心線１００側から周囲へ放射状に広がる方向である。本実施例では永久磁石４は複数個に分割されているが、単一の円筒形磁石で形成しても同様な磁場が得られる。   The permanent magnet 4 has a fan-shaped cross section as described above, and the contact surface with the yoke 3 and the opposite surface are magnetized. It arrange | positions with the yoke 3 in the groove part 63 of the insulation holder 6, and gives a magnetic force line to a contact contact part. The direction of the lines of magnetic force by the permanent magnet 4 is a direction toward the center line 100 side of the fixed contact terminal 2 or a direction that spreads radially from the center line 100 side of the fixed contact terminal 2 to the periphery. In the present embodiment, the permanent magnet 4 is divided into a plurality of parts, but a similar magnetic field can be obtained even if formed by a single cylindrical magnet.

補助継鉄９は、接点接触部の接点表面に効率よく磁力線が印加されるよう、上述のように一方が継鉄３と接合された状態で、固定接点端子２の内部に配置される。   The auxiliary yoke 9 is arranged inside the fixed contact terminal 2 in a state where one of the auxiliary yokes 9 is joined to the yoke 3 as described above so that the magnetic field lines are efficiently applied to the contact surface of the contact contact portion.

固定導電端子１は、上述のように、継鉄３の底面を挟み込んで固定接点端子２の突起部に嵌合され、固定接点端子２とは機械的にかつ、電気的にも一体化してある。   As described above, the fixed conductive terminal 1 is fitted into the protrusion of the fixed contact terminal 2 with the bottom surface of the yoke 3 interposed therebetween, and is mechanically and electrically integrated with the fixed contact terminal 2. .

可動板７は、上述のように両端部に２つの可動接点５が配置され、中央部で可動棒８と機械的に一体化されている。可動棒８は、磁気駆動型プランジャやエアプランジャ等の並進運動を行う一般的なアクチュエータに機械的に連結され、固定接点１０および固定接点端子２の中心線１００にほぼ平行な方向へ変位する。   As described above, the movable plate 7 has two movable contacts 5 disposed at both ends, and is mechanically integrated with the movable rod 8 at the center. The movable bar 8 is mechanically connected to a general actuator that performs translational movement, such as a magnetic drive type plunger and an air plunger, and is displaced in a direction substantially parallel to the center line 100 of the fixed contact 10 and the fixed contact terminal 2.

次に、図２を基に、本実施例の電気接点開閉部で生ずる磁力線の方向、すなわち磁場方向について述べる。図２に示す磁場方向２６は、永久磁石４の継鉄３側の面がＳ極で、その反対側の固定接点１０側の面がＮ極の場合である。表面形状がほぼ円輪形である固定接点１０を、絶縁ホルダ６を介して内包するように永久磁石４が配置されていることから、生ずる磁力線は、固定接点１０の中心線１００に対して略垂直で、かつ中心線１００に向かう方向となっている。また、磁束密度分布は固定接点１０と可動接点５の接点間空隙においてほぼ均一な分布となっている。この磁場方向は一例であって、これに限定されるものではない。   Next, based on FIG. 2, the direction of the magnetic lines generated in the electrical contact switching part of the present embodiment, that is, the direction of the magnetic field will be described. The magnetic field direction 26 shown in FIG. 2 is a case where the surface on the yoke 3 side of the permanent magnet 4 is the S pole and the surface on the opposite side of the fixed contact 10 is the N pole. Since the permanent magnet 4 is disposed so as to enclose the fixed contact 10 having a substantially annular surface shape via the insulating holder 6, the generated magnetic field lines are substantially perpendicular to the center line 100 of the fixed contact 10. In addition, the direction is toward the center line 100. The magnetic flux density distribution is substantially uniform in the gap between the fixed contact 10 and the movable contact 5. This magnetic field direction is an example, and the present invention is not limited to this.

次に、図３を基に、本実施例の電気接点開閉部を構成する各構成部材の詳細について述べる。絶縁ホルダ６は、セラミックのような高耐熱材を加工したものである。永久磁石４は、フェライト系磁石や希土類磁石等で形成されている。継鉄３および補助継鉄９は、電磁軟鉄等の磁性材である。固定導電端子１、固定接点端子２、可動接点５および可動板７は銅系材料である。   Next, based on FIG. 3, the detail of each structural member which comprises the electrical contact switching part of a present Example is described. The insulating holder 6 is obtained by processing a high heat resistant material such as ceramic. The permanent magnet 4 is formed of a ferrite magnet, a rare earth magnet, or the like. The yoke 3 and the auxiliary yoke 9 are magnetic materials such as electromagnetic soft iron. The fixed conductive terminal 1, the fixed contact terminal 2, the movable contact 5 and the movable plate 7 are made of a copper-based material.

次に、図４、図５を基に本実施例の電気接点開閉部で発生するアークの挙動について説明する。磁力線の方向は、図２で説明した方向である。負荷電流の極性は、一方の固定接点側が正（＋）で、他方の固定接点側が負（−）である。したがって、負荷（＋）に接続された固定接点１０と対向する可動接点５は（−）となり、負荷（−）に接続された固定接点１０と対向する可動接点５は（＋）となる。それらの２組の接点組のうち、図４の点線部で示した接点組１０１についてアークの挙動を説明する。なお、負荷電流の極性および磁場方向は一例であって、これに限定されるものではない。   Next, the behavior of the arc generated in the electrical contact switching part of this embodiment will be described with reference to FIGS. The direction of the magnetic lines of force is the direction described in FIG. The polarity of the load current is positive (+) on one fixed contact side and negative (-) on the other fixed contact side. Therefore, the movable contact 5 facing the fixed contact 10 connected to the load (+) is (−), and the movable contact 5 facing the fixed contact 10 connected to the load (−) is (+). Of these two contact sets, the behavior of the arc will be described for the contact set 101 shown by the dotted line in FIG. The polarity of the load current and the magnetic field direction are examples, and are not limited to these.

径方向に磁化された永久磁石４と継鉄３および補助継鉄９とによる磁場は、円輪状の接点空隙の全周に印加される。この磁場方向２６は、固定接点１０の中心線１００に対して垂直で、かつ中心線１００に向かう方向である。また、磁束密度分布は接点空隙において、ほぼ均一な分布となっている。このような円形終端型固定磁場中において、高負荷を遮断しアーク２７を発生させると、アーク２７はフレミングの左手の法則に従い、ローレンツ力を受けて円輪形状の接点接触部の表面を反時計回りに回転し始める。アーク２７自体は熱的に定常状態であるが、回転運動を始めると、その熱的定常状態が不安定となり、その維持が困難となる。したがって、磁場によりアーク２７が消滅しやすくなり遮断性能は向上する。なお、アーク２７が回転する方向は、アーク電流の極性および磁力線の向きによって決定される。   The magnetic field by the permanent magnet 4 magnetized in the radial direction, the yoke 3 and the auxiliary yoke 9 is applied to the entire circumference of the annular contact gap. The magnetic field direction 26 is a direction perpendicular to the center line 100 of the fixed contact 10 and toward the center line 100. Further, the magnetic flux density distribution is substantially uniform in the contact gap. In such a circular termination type fixed magnetic field, when the high load is interrupted and the arc 27 is generated, the arc 27 receives the Lorentz force in accordance with Fleming's left-hand rule, and counterclockwise contacts the surface of the ring-shaped contact contact portion. Begin to rotate around. The arc 27 itself is in a thermally steady state. However, when the rotary motion starts, the thermally steady state becomes unstable and it is difficult to maintain it. Therefore, the arc 27 is easily extinguished by the magnetic field, and the interruption performance is improved. The direction in which the arc 27 rotates is determined by the polarity of the arc current and the direction of the lines of magnetic force.

次に、本実施例１の電気接点開閉部の幾何学的寸法値の具体例について述べる。無論、これらは一例であって、これに限定するものではない。   Next, a specific example of the geometric dimension value of the electrical contact switching part of the first embodiment will be described. Of course, these are examples, and the present invention is not limited to these.

絶縁ホルダ６は、長さが４０ｍｍ〜５０ｍｍ、幅が２５ｍｍ〜３５ｍｍ、高さが２５ｍｍ〜３５ｍｍ、固定接点端子２は、外径がΦ６ｍｍ〜１５ｍｍ、高さが１０ｍｍ〜１５ｍｍ、可動接点５の外径はΦ４ｍｍ〜１０ｍｍ、永久磁石４は外径がΦ１５ｍｍ〜２０ｍｍ、内径がΦ１４ｍｍ〜１９ｍｍ、高さが８ｍｍ〜１２ｍｍ、継鉄３の外径はΦ１６ｍｍ〜２２ｍｍ、内径がΦ１５ｍｍ〜２０ｍｍ、高さが８ｍｍ〜１２ｍｍ、補助継鉄９の外形はΦ３ｍｍ〜５ｍｍ、高さは１２ｍｍ〜１５ｍｍ、固定導電端子１の外径はΦ１０ｍｍ〜１５ｍｍ、高さが５ｍｍ〜７ｍｍ、可動板７は長さが２５ｍｍ〜３５ｍｍ、幅が８ｍｍ〜１２ｍｍ、厚みが１ｍｍ〜２ｍｍである。   The insulating holder 6 has a length of 40 mm to 50 mm, a width of 25 mm to 35 mm, a height of 25 mm to 35 mm, and the fixed contact terminal 2 has an outer diameter of Φ6 mm to 15 mm, a height of 10 mm to 15 mm, and the outside of the movable contact 5 The diameter is Φ4mm to 10mm, the permanent magnet 4 is Φ15mm to 20mm, the inner diameter is Φ14mm to 19mm, the height is 8mm to 12mm, the outer diameter of the yoke 3 is Φ16mm to 22mm, the inner diameter is Φ15mm to 20mm, the height is The outer diameter of the auxiliary yoke 9 is Φ3 mm to 5 mm, the height is 12 mm to 15 mm, the outer diameter of the fixed conductive terminal 1 is Φ10 mm to 15 mm, the height is 5 mm to 7 mm, and the movable plate 7 is 25 mm to 25 mm in length It is 35 mm, the width is 8 mm to 12 mm, and the thickness is 1 mm to 2 mm.

このような幾何学的寸法値の電気接点開閉部について磁束密度および遮断特性を大気中で測定した。磁束密度は固定接点２の表面中央で３００Ｇｓ〜６００Ｇｓ程度であった。また、遮断特性は、固定接点と可動接点との空隙が０．５ｍｍ〜１．０ｍｍ程度の場合において、直流抵抗負荷３００Ｖｄｃ-５０Ａまで遮断が可能であることを確認できた。   The magnetic flux density and breaking characteristics of the electrical contact switching part having such a geometric dimension value were measured in the atmosphere. The magnetic flux density was about 300 Gs to 600 Gs at the center of the surface of the fixed contact 2. Moreover, the interruption | blocking characteristic has confirmed that interruption | blocking to DC resistance load 300Vdc-50A is possible when the space | gap of a stationary contact and a movable contact is about 0.5 mm-1.0 mm.

次に、本発明による電気接点開閉部の実施例２について説明する。本発明の実施例１では、固定接点端子２の一方の端面が固定接点１０の機能を有していた。しかし、実施例２では、固定接点端子２の筒形状の先端部の固定接点１０は他の部分とは異なる材料で形成し、可動接点５と対向させた。例えば、タングステン等のように、より高融点の金属や、より硬度の大きい金属を先端部に接合して固定接点として用いることができる。これにより、固定接点材料選択の幅が広がり、より高い遮断性能が実現可能となる。   Next, a second embodiment of the electrical contact switching part according to the present invention will be described. In Example 1 of the present invention, one end face of the fixed contact terminal 2 has the function of the fixed contact 10. However, in Example 2, the fixed contact 10 at the distal end of the cylindrical shape of the fixed contact terminal 2 was formed of a material different from that of the other portions and opposed to the movable contact 5. For example, a metal having a higher melting point or a metal having a higher hardness such as tungsten can be used as a fixed contact by joining the tip. Thereby, the range of fixed contact material selection spreads, and it becomes possible to realize higher breaking performance.

以上のように、上記実施例ではアークの特定方向への飛散を制限し、デバイスの小型化が可能で、かつ負荷の極性による影響がなく、遮断特性の良好な磁気吹消形の電気接点開閉部が得られる。   As described above, in the above embodiment, the electric contact switching unit of the magnetic blow-off type that restricts the scattering of the arc in a specific direction, can reduce the size of the device, is not affected by the polarity of the load, and has a good breaking characteristic. Is obtained.

なお、本発明は上記の実施例に限定されるものではないことは言うまでもなく、用途や必要とされる機能、性能に応じて設計変更が可能である。例えば、固定接点端子の筒形状は円筒形状である必要はなく多角形の筒状でもよく、固定接点端子、永久磁石、継鉄、補助継鉄、可動接点、可動板、絶縁ホルダの形状や寸法、固定接点端子の突起部の形状やその個数なども目的に合わせて変更可能である。   Needless to say, the present invention is not limited to the above-described embodiments, and the design can be changed in accordance with the application, required function, and performance. For example, the cylindrical shape of the fixed contact terminal need not be a cylindrical shape, and may be a polygonal cylindrical shape. The shape and dimensions of the fixed contact terminal, permanent magnet, yoke, auxiliary yoke, movable contact, movable plate, and insulation holder The shape and number of protrusions of the fixed contact terminal can be changed according to the purpose.

本発明の実施例１に係る電気接点開閉部の縦断面図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of an electrical contact switching part according to a first embodiment of the present invention. 図１におけるＡ−Ａ断面図。AA sectional drawing in FIG. 実施例１の部品別展開斜視図。FIG. 3 is an exploded perspective view of parts according to the first embodiment. 実施例１における遮断時の負荷極性の一例を示す図。FIG. 3 is a diagram illustrating an example of load polarity at the time of interruption in the first embodiment. 図４の点線部に示す１つの接点組におけるアーク挙動を説明した図。The figure explaining the arc behavior in one contact group shown to the dotted line part of FIG. 従来の磁気吹消形接点開閉部の一例を示す図、図６（ａ）はそれに使用される固定接触子端子ブロックの斜視図、図６（ｂ）はその正面図。The figure which shows an example of the conventional magnetic blow-off type contact opening / closing part, Fig.6 (a) is a perspective view of the stationary contact terminal block used for it, FIG.6 (b) is the front view.

符号の説明Explanation of symbols

１ 固定導電端子
２ 固定接点端子
３ 継鉄
４ 永久磁石
５ 可動接点
６ 絶縁ホルダ
７ 可動板
８ 可動棒
９ 補助継鉄
１０ 固定接点
２１、２２ 固定接点構造体
２３ 可動接点構造体
２５ 突起部
２６ 磁場方向
６０ 円筒形状部分
６１ 底面部
６２ 穴
６３ 溝部
７０ 嵌合穴
１００ 中心線
１０１ 接点組
２７、３０，４０ アーク
３１ 固定接触子端子ブロック
３２ プラスチック部材
３４、３５、４４、４５ 接点
３８、４８ 磁力線
３９、４９ 可動接触子
４６ マグネット部材
５１、５２ 固定接点端子 1 fixed conductive terminal 2 fixed contact terminal 3 yoke 4 permanent magnet 5 movable contact 6 insulating holder 7 movable plate 8 movable rod 9 auxiliary yoke 10 fixed contacts 21 and 22 fixed contact structure 23 movable contact structure 25 protrusion 26 magnetic field Direction 60 Cylindrical portion 61 Bottom portion 62 Hole 63 Groove portion 70 Fitting hole 100 Center line 101 Contact set 27, 30, 40 Arc 31 Fixed contact terminal block 32 Plastic member 34, 35, 44, 45 Contact point 38, 48 Magnetic field line 39 , 49 Movable contact 46 Magnet member 51, 52 Fixed contact terminal

Claims (3)

２つの固定接点構造体と、該２つの固定接点構造体を併置し保持する絶縁ホルダと、可動接点構造体と、前記固定接点構造体にそれぞれ接続された２つの固定導電端子とからなる電気接点開閉部において、
前記固定接点構造体は、筒形状を有し該筒形状の一方の先端面を固定接点とし、他方の端部に突起部を有する固定接点端子と、円筒形状部分と底面部を有し、前記円筒形状部分の内部に前記固定接点端子を内包し、前記底面部に前記突起部に嵌合する穴を有する継鉄と、該継鉄の前記円筒形状部分の内面に配置される永久磁石と、前記固定接点端子の筒形状の内部に配置され前記継鉄の前記底面部の中央部に接合した略円柱状の補助継鉄とからなり、前記絶縁ホルダは、前記永久磁石と前記継鉄を配置するための略円柱形状の溝部を有し、前記固定接点端子の前記固定接点の周辺部分を空隙を介して内包し、前記固定導電端子は前記固定接点端子との間に前記継鉄の前記底面部を挟み込んで前記固定接点端子の突起部に嵌合する構造を有し、前記可動接点構造体は、前記固定接点と類似の断面形状を有する筒形状を有し前記固定接点と各々空隙を介して対向配置した２つの可動接点と、両端部に前記２つの可動接点が配置され中央部に嵌合穴が設けられた可動板と、該可動板に前記嵌合穴により接合され前記固定接点端子の筒形状の中心線に対して略平行方向へ変位する可動棒とを具備し、前記可動接点と前記固定接点の空隙領域において前記中心線に対して略垂直で、かつ前記中心線に向かう方向または、前記中心線から放射する方向の磁力線を発生させることを特徴とする電気接点開閉部。 An electric contact comprising two fixed contact structures, an insulating holder for juxtaposing and holding the two fixed contact structures, a movable contact structure, and two fixed conductive terminals respectively connected to the fixed contact structures In the opening and closing part,
The fixed contact structure has a cylindrical shape, and has a cylindrical contact portion and a bottom surface portion, a fixed contact terminal having one cylindrical end surface as a fixed contact, and a projecting portion at the other end, A yoke containing the fixed contact terminal inside a cylindrical portion, and having a hole fitted in the protrusion on the bottom surface portion; and a permanent magnet disposed on the inner surface of the cylindrical portion of the yoke; It consists of a substantially columnar auxiliary yoke that is arranged inside the cylindrical shape of the fixed contact terminal and joined to the center of the bottom surface of the yoke, and the insulating holder arranges the permanent magnet and the yoke A substantially cylindrical groove portion for enclosing a peripheral portion of the fixed contact terminal with a gap, and the bottom surface of the yoke between the fixed conductive terminal and the fixed contact terminal. Having a structure that sandwiches the portion and fits into the protrusion of the fixed contact terminal, The movable contact structure has a cylindrical shape having a cross-sectional shape similar to that of the fixed contact, and has two movable contacts arranged opposite to the fixed contact via gaps, and the two movable contacts are arranged at both ends. And a movable plate provided with a fitting hole at the center, and a movable rod joined to the movable plate by the fitting hole and displaced in a direction substantially parallel to the cylindrical center line of the fixed contact terminal. In the gap region between the movable contact and the fixed contact, a magnetic force line is generated that is substantially perpendicular to the center line and is directed toward or radiates from the center line. Contact opening / closing part. 前記永久磁石は扇形の断面形状を有する複数の永久磁石からなることを特徴とする請求項１記載の電気接点開閉部。   The electrical contact switching part according to claim 1, wherein the permanent magnet includes a plurality of permanent magnets having a fan-shaped cross-sectional shape. 前記固定接点は前記固定接点端子の他の部分とは異なる金属を前記固定接点端子の先端部に接合配置してなることを特徴とする請求項１または２記載の電気接点開閉部。   The electrical contact switching part according to claim 1 or 2, wherein the fixed contact is formed by joining and disposing a metal different from other parts of the fixed contact terminal to a tip part of the fixed contact terminal.
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