JP5566251B2 - relay - Google Patents

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JP5566251B2
JP5566251B2 JP2010229241A JP2010229241A JP5566251B2 JP 5566251 B2 JP5566251 B2 JP 5566251B2 JP 2010229241 A JP2010229241 A JP 2010229241A JP 2010229241 A JP2010229241 A JP 2010229241A JP 5566251 B2 JP5566251 B2 JP 5566251B2
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contact
arc current
relay
current
edge portion
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JP2012084368A (en
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強平 蓑田
健太郎 小倉
哲也 小林
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Mitsubishi Electric Corp
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Description

この発明は、低コストにてアーク電流を消弧することができる継電器に関するものである。   The present invention relates to a relay that can extinguish an arc current at low cost.

従来の継電器は、２接点が負荷を介してシリーズに接続され、接点間に発生するアーク電流を磁石の磁力を利用してアーク電流を湾曲させ吹き飛ばすものである（例えば、特許文献１参照）。その他の従来としては、一方の接点の断面形状を先端に向かって細くなるように傾斜するような接点形状を有し、その延長上にあるアーク電流走行導体へアーク電流を走行させやすくするものである（例えば、特許文献２参照）。   In a conventional relay, two contacts are connected in series via a load, and the arc current generated between the contacts is bent by using the magnetic force of a magnet to blow off the arc current (see, for example, Patent Document 1). Other conventional ones have a contact shape that inclines so that the cross-sectional shape of one contact becomes narrower toward the tip, making it easier to run the arc current to the arc current running conductor on the extension. Yes (see, for example, Patent Document 2).

特開２００９−８７９１８号公報（［００１１］、［００１３］、［００１４］、図１、４）Japanese Patent Laying-Open No. 2009-87918 ([0011], [0013], [0014], FIGS. 1 and 4) 特開２００２−３３４６４４号公報（［０００４］、［０００５］、図３〜８）JP 2002-334644 A ([0004], [0005], FIGS. 3 to 8)

従来の継電器は、アーク電流の消弧性能向上（アーク電流の消え易さ、消し易さの性能向上のこと）に対して、先の従来例のような場合では、接点付近に永久磁石を配置し、発生したアーク電流に対して永久磁石の磁束を鎖交させ、アーク電流を吹き飛ばすことで、遮断性能向上を可能としている。また、後の従来例のような場合では、接点形状はアーク電流が移動しやすいように接点先端に傾斜を設けるような構造にして接点に接続したアーク電流ランナへアーク電流を移動させることによって、遮断性能向上を可能としている。しかし、いずれの従来例の場合にも、消弧性能を向上させるために接点以外に他の部品の設置が必要となる。小型のリレーにおいては、他部品（永久磁石やアーク電流ランナー）を設置するスペースを確保する必要があり、筐体サイズ増、部品点数増加やコスト増が懸念される。また、後の従来例の場合には、一般的に高価な部品となる永久磁石を設置しなければならないため、遮断性能は格段に向上するがコストの大幅な増加や周辺の磁性材の設置位置に制限を受ける等の問題点があった。   Conventional relays have improved arc extinguishing performance for arc current (improvement of arc current extinction and ease of extinguishing performance). However, the interruption performance can be improved by interlinking the magnetic flux of the permanent magnet with the generated arc current and blowing off the arc current. Also, in the case of the later conventional example, the contact shape is structured so that the tip of the contact is inclined so that the arc current can easily move, and the arc current is moved to the arc current runner connected to the contact, Improves the shut-off performance. However, in any of the conventional examples, it is necessary to install other parts in addition to the contacts in order to improve the arc extinguishing performance. In a small relay, it is necessary to secure a space for installing other components (permanent magnets and arc current runners), and there is a concern about an increase in housing size, an increase in the number of components, and an increase in cost. In the case of the conventional example later, since permanent magnets, which are generally expensive parts, must be installed, the interruption performance is greatly improved, but the cost is greatly increased and the surrounding magnetic materials are installed. There were problems such as being restricted.

この発明は上記のような課題を解決するためになされたものであり、低コストにてアーク電流を消弧することができる継電器を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object thereof is to provide a relay that can extinguish an arc current at low cost.

この発明は、固定接点と、上記固定接点に対向して配設され可動して接離する可動接点とを備え、
上記固定接点および上記可動接点のいずれもの接点側には、接点面と接点面に連接される側面とのなす角が鋭角となるエッジ部を備えたものである。 The present invention includes a fixed contact, and a movable contact that is disposed opposite to the fixed contact and moves and contacts and separates,
On either contact side of the fixed contact and the movable contact , an edge portion having an acute angle between the contact surface and the side surface connected to the contact surface is provided.

この発明の継電器は、上記のように構成されているので、
エッジ部において発生したアーク電流をローレンツ力により外部に吹き飛ばすことができ、接点面におけるダメージを低減することができる。 Since the relay of this invention is configured as described above ,
The arc current generated in the edge portion can be blown out by the Lorentz force, and damage on the contact surface can be reduced.

この発明の実施の形態１の継電器の構成を示す図である。It is a figure which shows the structure of the relay of Embodiment 1 of this invention. 図１に示した継電器の接点部分の構成を示した断面図である。It is sectional drawing which showed the structure of the contact part of the relay shown in FIG. 図２に示した接点部分の鋭角部の定義を説明するための図である。It is a figure for demonstrating the definition of the acute angle part of the contact part shown in FIG. 図２に示した接点部分の他の鋭角部の定義を説明するための図である。It is a figure for demonstrating the definition of the other acute angle part of the contact part shown in FIG. 図２に示した接点部分の他の鋭角部の定義を説明するための図である。It is a figure for demonstrating the definition of the other acute angle part of the contact part shown in FIG. 図２に示した接点部分のアーク電流の消弧過程を説明するための図である。It is a figure for demonstrating the arc extinguishing process of the arc current of the contact part shown in FIG. 図２の接点部分の接点面をマクロに見た場合のアーク電流の発生過程を説明するための図である。It is a figure for demonstrating the generation | occurrence | production process of the arc current at the time of seeing the contact surface of the contact part of FIG. 2 macroscopically. 図２の接点部分の接点面をマクロに見た場合のアーク電流の発生過程を説明するための図である。It is a figure for demonstrating the generation | occurrence | production process of the arc current at the time of seeing the contact surface of the contact part of FIG. 2 macroscopically. 図２に示した接点部分の接点表面位置と接触抵抗との関係を示す図である。It is a figure which shows the relationship between the contact surface position and contact resistance of the contact part shown in FIG. この発明の実施の形態２の継電器の接点部分の構成を示す図である。It is a figure which shows the structure of the contact part of the relay of Embodiment 2 of this invention.

実施の形態１．
以下、本願発明の実施の形態について説明する。図１はこの発明の実施の形態１における継電器の構成を示す図、図２は図１に示した継電器の接点部分の構成を示した断面図、図３は図２に示した接点部分の鋭角部の定義を説明するための図、図４および図５は図２に示した接点部分の他の鋭角部の定義を説明するための図、図６は図２に示した接点部分のアーク電流の消弧過程を説明するための図、図７および図８は図２の接点部分の接点面をマクロに見た場合のアーク電流の発生過程を説明するための図、図９は図２に示した接点部分の接点表面位置と接触抵抗との関係を示す図である。 Embodiment 1 FIG.
Embodiments of the present invention will be described below. 1 is a diagram showing a configuration of a relay according to Embodiment 1 of the present invention, FIG. 2 is a cross-sectional view showing a configuration of a contact portion of the relay shown in FIG. 1, and FIG. 3 is an acute angle of the contact portion shown in FIG. FIG. 4 and FIG. 5 are diagrams for explaining the definition of another acute angle portion of the contact portion shown in FIG. 2, and FIG. 6 is an arc current of the contact portion shown in FIG. FIG. 7 and FIG. 8 are diagrams for explaining the arc current generation process when the contact surface of the contact portion of FIG. 2 is viewed macroscopically. FIG. 9 is a diagram for explaining the arc extinguishing process of FIG. It is a figure which shows the relationship between the contact surface position and contact resistance of the shown contact part.

図において、継電器として、電磁アクチュエータ１１と、固定接点９と、固定接点９に対向して配設され可動して接離する可動接点１０とを備えている。この発明の継電器は、例えば、電力量計の遠隔操作開閉用リレーなど、特に高電圧の交流電流または直流電流を遮断するのに必要な回路に適用可能なものとして用いられることが考えられる。可動接点１０の可動動作は、電磁アクチュエータ１１により行われている。尚、他の機構であってもよく、例えば、バネ操作等によって可動する構成でも良い。そして、可動接点１０および固定接点９には電流Ａが通電される。このために、例えばベース材として銅材が用いられ、表面処理として銀メッキ等のメッキ処理が施され形成されている。また、可動接点１０および固定接点９の接点側の平面形状は円形、または矩形にて形成されることが考えられる。   In the figure, as a relay, an electromagnetic actuator 11, a fixed contact 9, and a movable contact 10 that is disposed so as to face the fixed contact 9 and that moves and contacts are provided. The relay according to the present invention can be used as a relay applicable to a circuit necessary for interrupting a high-voltage AC current or DC current, such as a remote control switching relay of a watt-hour meter. The movable operation of the movable contact 10 is performed by an electromagnetic actuator 11. In addition, another mechanism may be sufficient, for example, the structure movable by spring operation etc. may be sufficient. The current A is applied to the movable contact 10 and the fixed contact 9. For this purpose, for example, a copper material is used as a base material, and a plating treatment such as silver plating is applied as a surface treatment. In addition, it is conceivable that the planar shape of the contact side of the movable contact 10 and the fixed contact 9 is a circle or a rectangle.

そして、固定接点９または可動接点１０の接点側には、図３に示すように、接点面９ａ、１０ａと接点面９ａ、１０ａに連接される側面９ｂ、１０ｂとのなす角θが鋭角となるエッジ部１、２が、固定接点９および可動接点１０の両方の、接点面９ａ、１０ａと接点面９ａ、１０ａに連接される側面９ｂ、１０ｂとの全周において形成されている。そして、接点面９ａ、１０ａと側面９ｂ、１０ｂとの交点Ｘは電界を集中させることが可能となる。   As shown in FIG. 3, an angle θ formed between the contact surfaces 9a and 10a and the side surfaces 9b and 10b connected to the contact surfaces 9a and 10a becomes an acute angle on the contact side of the fixed contact 9 or the movable contact 10. Edge portions 1 and 2 are formed on the entire circumference of contact surfaces 9a and 10a and side surfaces 9b and 10b connected to contact surfaces 9a and 10a of both fixed contact 9 and movable contact 10. The electric field can be concentrated at the intersection X between the contact surfaces 9a and 10a and the side surfaces 9b and 10b.

次に上記のように構成された実施の形態１の継電器の動作について図６ないし図８に基づいて説明する。まず、接点の部分をマクロにみると、接点面９ａ、１０ａは凹凸がある。よって、接点面９ａ、１０ａが開極するとき、この凹凸中の最終接触点に電流が集中する（図７（ａ））。よって、この最終接触点が溶解し熱ガスが発生する（図７（ｂ））。次に、接点間にて発生した熱ガスはそのガス圧の関係から接点の外側方向へ押し出されるように移動する（図８（ａ））。次に、接点間で発生した熱ガスが接点外側へ移動することによって、エッジ部１、２（電界集中エリア）に、その熱ガスがふれることで、エッジ部１、２でブレークダウンを生じ、エッジ部１、２で熱ガスがアーク電流へと成長する（図８（ｂ））。   Next, the operation of the relay of the first embodiment configured as described above will be described with reference to FIGS. First, when the contact portion is viewed macroscopically, the contact surfaces 9a and 10a are uneven. Therefore, when the contact surfaces 9a and 10a are opened, the current is concentrated at the final contact point in the unevenness (FIG. 7A). Therefore, the final contact point is dissolved and hot gas is generated (FIG. 7B). Next, the hot gas generated between the contacts moves so as to be pushed outward from the contact due to the gas pressure (FIG. 8A). Next, when the hot gas generated between the contacts moves to the outside of the contacts, the thermal gas touches the edge portions 1 and 2 (electric field concentration area), thereby causing a breakdown at the edge portions 1 and 2. The hot gas grows into an arc current at the edge portions 1 and 2 (FIG. 8B).

次に、可動接点１０が動作し接点間が開く時に発生するアーク電流を吹き消す過程について図６に基づいて説明する。図に示すように電流Ａの可動接点１０側での経路は、電流Ａ１、電流Ｂ１となり、固定接点９に流れる経路は電流Ａ２、電流Ｂ２となる。電流Ａ１および電流Ａ２から生じるローレンツ力の水平方向成分ＦＡと、電流Ｂ１および電流Ｂ２から生じる水平方向のローレンツ力ＦＢの方向が同方向で、外部側に向かって吹き飛ばす方向に働く。このため、アーク電流４（破線にて囲まれた部分）からアーク電流５（実線にて囲まれた部分）に示すように、このローレンツ力ＦＡ、ＦＢの合力によって、アーク電流４には外部側に向かって引き伸ばされる力が作用し、アーク電流５となり外部側へとすみやかに吹き飛ばされる。これにより、接点面９ａ、１０ａのダメージを抑制することが可能になる。   Next, the process of blowing off the arc current generated when the movable contact 10 operates and the contact is opened will be described with reference to FIG. As shown in the drawing, the path of the current A on the movable contact 10 side is the current A1 and the current B1, and the path flowing through the fixed contact 9 is the current A2 and the current B2. The horizontal direction component FA of the Lorentz force generated from the current A1 and the current A2 and the horizontal direction Lorentz force FB generated from the current B1 and the current B2 are the same direction, and work in the direction of blowing toward the outside. For this reason, as shown in the arc current 4 (portion surrounded by a broken line) to the arc current 5 (portion surrounded by a solid line), the arc current 4 has an external side due to the resultant force of the Lorentz forces FA and FB. As a result, a force that is stretched toward the surface acts, and an arc current 5 is generated, which is immediately blown off to the outside. Thereby, it becomes possible to suppress damage to the contact surfaces 9a and 10a.

次に、多数回の開閉動作において接点のエッジ部１、２は損耗が進行していくことが想定される。エッジ部１、２の損耗度合いについては、エッジ部１、２のなす角θに依存する。エッジ部１、２のなす角θが小さいほど、電界集中の効果は大きいが、多数回の開閉動作による損耗度合いは大きくなり、なす角θが大きいほど、電界集中の効果が低減するが損耗度合いを抑制することができる。つまり、エッジ部１、２のなす角θの下限値はアーク電流に曝されたとしても物理的に対応可能となる角度であり、上限値は上記示したような電界集中効果が得られる程度の角度であると言える。さらに、機械加工精度、多数回開閉動作に耐えることができる機械的な強度も併せて考慮する必要がある。これらのことから、エッジ部１、２のなす角θは３０°〜６０°程度が最適形状だと考えられる。   Next, it is assumed that wear and tear of the edge portions 1 and 2 of the contact proceeds in many opening and closing operations. The degree of wear of the edge portions 1 and 2 depends on the angle θ formed by the edge portions 1 and 2. The smaller the angle θ formed by the edge portions 1 and 2, the greater the effect of electric field concentration, but the greater the degree of wear due to many opening / closing operations, the greater the formed angle θ, the less the effect of electric field concentration, but the degree of wear Can be suppressed. That is, the lower limit value of the angle θ formed by the edge portions 1 and 2 is an angle that can be physically handled even when exposed to the arc current, and the upper limit value is such that the electric field concentration effect as described above can be obtained. It can be said that it is an angle. Furthermore, it is necessary to consider together the machining strength and the mechanical strength that can withstand many opening and closing operations. From these facts, it is considered that the angle θ formed by the edge portions 1 and 2 is about 30 ° to 60 ° as the optimum shape.

次に、継電器の寿命において寿命劣化の要因の一つに通電性能劣化が考えられる。本発明の接点形状のようにエッジ部１、２のなす角θを鋭角にすることで、接点間に発生するアーク電流はローレンツ力によってエッジ部１、２からすみやかに消すことが可能となる。図９に、多数回の開閉動作によってエッジ部１、２の損耗が増加し消耗部６ａ、６ｂが発生した後の接点面９ａ、１０ａの接触抵抗分布を示す。図９（ｂ）のＸ軸は接点面９ａ、１０ａの水平方向の位置関係を示し、Ｙ軸は各位置における接触抵抗を示している。Ｘ軸の水平方向の位置関係は図９（ａ）に示している位置関係である。   Next, in the life of the relay, one of the causes of the life deterioration is considered to be deterioration of the energization performance. By making the angle θ formed by the edge portions 1 and 2 acute as in the contact shape of the present invention, the arc current generated between the contacts can be quickly extinguished from the edge portions 1 and 2 by the Lorentz force. FIG. 9 shows the contact resistance distribution of the contact surfaces 9a and 10a after the wear of the edge portions 1 and 2 is increased and the consumable portions 6a and 6b are generated by many opening and closing operations. In FIG. 9B, the X axis indicates the positional relationship of the contact surfaces 9a and 10a in the horizontal direction, and the Y axis indicates the contact resistance at each position. The positional relationship in the horizontal direction of the X axis is the positional relationship shown in FIG.

図に示すように、本発明の接点形状を適用することで、多数回の開閉動作によって、エッジ部１、２は消耗部６ａ、６ｂとなり接触抵抗が増加することが予想される。しかし、電流Ａはエッジ部１、２の損耗部６ａ、６ｂを通らず、接触抵抗値が小さい他の接点面９ａ、１０ａを通電する。さらに、開閉回数を増加させたとしても、エッジ部１、２（ｘ＝０、Ｌ付近）の接触抵抗値はある程度上昇するが、その他接点面９ａ、１０ａにはダメージが及ばないことから接触抵抗値の大幅な上昇の抑制が可能となる。よって、接点の通電するための接点面のダメージが抑制され、継電器の長寿命化が可能となる。   As shown in the figure, by applying the contact shape of the present invention, it is expected that the edge portions 1 and 2 become the consumable portions 6a and 6b and the contact resistance is increased by many opening and closing operations. However, the current A does not pass through the worn portions 6a and 6b of the edge portions 1 and 2, and energizes the other contact surfaces 9a and 10a having a small contact resistance value. Furthermore, even if the number of times of opening and closing is increased, the contact resistance value of the edge portions 1 and 2 (x = 0, near L) rises to some extent, but the contact points 9a and 10a are not damaged, so the contact resistance It is possible to suppress a significant increase in value. Therefore, the damage of the contact surface for energizing the contact is suppressed, and the life of the relay can be extended.

また、エッジ部１、２は、上記に示したように通電においてほぼ寄与していないため、他の接点面９ａ、１０ａと同様に抵抗を低減する必要がない。よって、耐アーク電流に優れている、例えばエッジ部１、２の形成されていない箇所の固定接点９または可動接点１０より高融点材にて形成することもできる。高融点材としては、先のメッキ加工を施さないものにて対応する場合、タングステン材にて形成する場合が考えられる。このように形成すれば、耐アーク電流に優れているため、多数回の開閉動作を行っても損耗しにくくなる。尚、このことは以下の実施の形態でも同様であるためその説明は適宜省略する。   Further, since the edge portions 1 and 2 do not substantially contribute to energization as described above, it is not necessary to reduce the resistance like the other contact surfaces 9a and 10a. Therefore, it can also be formed of a high melting point material that is superior in arc-proof current, for example, from the fixed contact 9 or the movable contact 10 where the edge portions 1 and 2 are not formed. As the high melting point material, a case where the material is not subjected to the previous plating process, or a case where it is formed of a tungsten material can be considered. If formed in this manner, the arc-proof current is excellent, so that it is difficult to wear even if the switching operation is performed many times. Since this is the same in the following embodiments, the description thereof will be omitted as appropriate.

上記のように構成された実施の形態１の継電器によれば、電界集中箇所を制御することができるエッジ部を有しているため、エッジ部にアーク電流が発生する。その際に、アーク電流を接点外側へ吹き飛ばす力（ローレンツ力）を効果的にアーク電流に作用させることができ、アーク電流の消弧性能が向上する。また、多数回の開閉（接離）動作において、エッジ部にダメージが集中するため、他の接点面のダメージが軽減および接点接触抵抗値上昇が抑制できる。このような効果を、エッジ部を形成することにて得ることができるため、他に部品など備える必要が無く、低コストにて実施することができる。また、他の部品などが必要ないため、減量化となり、包装が削減でき、それによる、環境負荷の軽減が実施可能となる。   According to the relay of the first embodiment configured as described above, an arc current is generated at the edge portion because the edge portion capable of controlling the electric field concentration location is provided. At that time, the force (Lorentz force) for blowing the arc current to the outside of the contact can be effectively applied to the arc current, and the arc extinguishing performance of the arc current is improved. In addition, in many opening / closing (contact / separation) operations, damage concentrates on the edge portion, so that damage to other contact surfaces can be reduced and increase in contact contact resistance value can be suppressed. Since such an effect can be obtained by forming the edge portion, it is not necessary to provide other components and can be implemented at a low cost. In addition, since no other parts are required, the amount can be reduced and packaging can be reduced, thereby reducing the environmental load.

尚、上記実施の形態１においては、エッジ部の鋭角の交点Ｘを図３に示したような構造を例に示したが、これに限られることはなく、例えば、図４および図５に示すように交点Ｘが、電界を集中できる程度の微小な面取り加工、Ｃ加工、または、Ｒ加工された構造でもよく、上記実施の形態１と同様の効果を奏することができる。   In the first embodiment, the acute intersection point X of the edge portion is shown as an example of the structure shown in FIG. 3, but the present invention is not limited to this. For example, as shown in FIG. 4 and FIG. Thus, the crossing point X may be a fine chamfering process, C process, or R process that can concentrate the electric field, and the same effect as in the first embodiment can be obtained.

また、上記実施の形態１においては、エッジ部を固定接点および可動接点の両方に形成する例を示したが、これに限られることはなく、例えば固定接点または可動接点のいずれか一方に形成する場合であっても、エッジ部の形成された部分においては、力の大きさの差はあるものの上記実施の形態１と同様にローレンツ力を生じるため、上記実施の形態１と同様の効果を奏することができる。このことは以下の実施の形態においても同様のことが言えるため、その説明は適宜省略する。   In the first embodiment, the example in which the edge portion is formed on both the fixed contact and the movable contact is shown. However, the present invention is not limited to this. For example, the edge is formed on either the fixed contact or the movable contact. Even in such a case, the Lorentz force is generated in the portion where the edge portion is formed, although there is a difference in the magnitude of the force, the same effect as in the first embodiment is obtained. be able to. The same applies to the following embodiments, and the description thereof will be omitted as appropriate.

また、上記実施の形態１においては、エッジ部を固定接点および可動接点の接点面と接点面に連接される側面との全周において形成する例を示したが、これに限られることはなく、例えば固定接点または可動接点のいずれか一方において、接点面と接点面に連接される側面との一部において形成する場合であっても、エッジ部の形成された部分においては、力の大きさの差はあるものの上記実施の形態１と同様にローレンツ力を生じるため、上記実施の形態１と同様の効果を奏することができる。このことは以下の実施の形態においても同様のことが言えるため、その説明は適宜省略する。   In the first embodiment, the edge portion is formed on the entire circumference of the contact surface of the fixed contact and the movable contact and the side surface connected to the contact surface. However, the present invention is not limited to this. For example, in either one of the fixed contact and the movable contact, even when the contact surface and the side surface connected to the contact surface are partly formed, in the portion where the edge portion is formed, the magnitude of the force Although there is a difference, Lorentz force is generated in the same manner as in the first embodiment, so that the same effect as in the first embodiment can be obtained. The same applies to the following embodiments, and the description thereof will be omitted as appropriate.

実施の形態２．
図１０はこの発明の実施の形態２による継電器の構成を示す断面図である。図において、上記実施の形態１と同様の部分は同一符号を付して説明を省略する。上記実施の形態１の場合と異なる箇所は、エッジ部７、８であり、固定接点９および可動接点１０が接している配置において（図１０の状態）、エッジ部７、８と相対する固定接点９あるいは可動接点１０の接点面９ａ、１０ｂと離反しているものである。 Embodiment 2. FIG.
FIG. 10 is a cross-sectional view showing the configuration of the relay according to Embodiment 2 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The portions different from the case of the first embodiment are the edge portions 7 and 8, and the fixed contact facing the edge portions 7 and 8 in the arrangement in which the fixed contact 9 and the movable contact 10 are in contact (the state of FIG. 10). 9 or the contact surfaces 9 a and 10 b of the movable contact 10.

上記のように構成された実施の形態２の継電器の動作について説明する。まず、上記実施の形態１と同様に電流は流れる。そして、エッジ部７、８は常に離反した構成となるため、通電経路として機能させず、アーク電流を発弧、吹き飛ばして消弧させる機能のみに限定される。これによって、通電経路となる他の接点面９ａ、１０ａはアーク電流によるダメージがなくなるため、接触抵抗が増加しない。   The operation of the relay of the second embodiment configured as described above will be described. First, a current flows as in the first embodiment. And since the edge parts 7 and 8 become the structure which always left | separated, it is not made to function as an electricity supply path | route, but is limited only to the function to ignite and blow off the arc current. As a result, the other contact surfaces 9a and 10a serving as energization paths are not damaged by the arc current, and the contact resistance does not increase.

上記のように構成された実施の形態２の継電器によれば、上記実施の形態１と同様の効果を奏するのはもちろんのこと、エッジ部を電気的に常に切り離された構造にて形成しているため、エッジ部でアーク電流をすみやかに消弧させることで他の接点表面にダメージをより一層抑制することができる。また、エッジ部はアーク電流が点弧するため損耗が生じるが、定格通電時にはエッジ部に電流が通電されないため、接触抵抗値の上昇をより一層抑制することができる。   According to the relay of the second embodiment configured as described above, the edge portion is formed with a structure that is always electrically disconnected, as well as the same effect as the first embodiment. Therefore, it is possible to further suppress damage to the other contact surfaces by promptly extinguishing the arc current at the edge portion. Further, although the edge portion is worn out because the arc current is ignited, the current is not supplied to the edge portion at the time of rated energization, so that the increase in the contact resistance value can be further suppressed.

尚、上記実施の形態２においては、上記に示したような平坦な面にて形成する場合に限られることはなく、例えばエッジ部の離反させるために、接点面全体に微小なＲ曲面にて形成し、エッジ部を離反するように形成しても、上記実施の形態２と同様の効果を奏することができる。   In the second embodiment, the present invention is not limited to the flat surface as shown above. For example, in order to separate the edge portion, the entire contact surface is formed with a small R curved surface. Even if it is formed so that the edge portions are separated from each other, the same effect as in the second embodiment can be obtained.

１，２，７，８ エッジ部、４，５ アーク電流、９ 固定接点、
９ａ，１０ａ 接点面、９ｂ，１０ｂ 側面、１０ 可動接点、
ＦＡ，ＦＢ ローレンツ力。 1, 2, 7, 8 Edge, 4, 5 Arc current, 9 Fixed contact,
9a, 10a contact surface, 9b, 10b side surface, 10 movable contact,
FA, FB Lorentz force.

Claims (4)

固定接点と、上記固定接点に対向して配設され可動して接離する可動接点とを備え、
上記固定接点および上記可動接点のいずれもの接点側には、接点面と接点面に連接される側面とのなす角が鋭角となるエッジ部を備えたことを特徴とする継電器。 A fixed contact; and a movable contact that is disposed opposite to the fixed contact and that moves and contacts and is separated,
A relay comprising: an edge portion having an acute angle formed by a contact surface and a side surface connected to the contact surface on the contact side of each of the fixed contact and the movable contact. 上記固定接点および上記可動接点が接している配置において、
上記エッジ部は、上記エッジ部と相対する上記固定接点あるいは上記可動接点の上記接点面と離反していることを特徴とする請求項１に記載の継電器。 In the arrangement where the fixed contact and the movable contact are in contact,
The relay according to claim 1, wherein the edge portion is separated from the contact surface of the fixed contact or the movable contact facing the edge portion. 上記エッジ部は、上記エッジ部の形成されていない箇所の上記固定接点または上記可動接点より高融点材にて形成されていることを特徴とする請求項１または請求項２に記載の継電器。 The relay according to claim 1 or 2, wherein the edge portion is formed of a high melting point material than the fixed contact or the movable contact at a portion where the edge portion is not formed. 上記エッジ部は、上記固定接点および上記可動接点のいずれもの上記接点面と上記接点面に連接される上記側面との全周において形成されていることを特徴とする請求項１ないし請求項３のいずれか１項に記載の継電器。 The edge portion is formed on the entire circumference of the contact surface of either the fixed contact or the movable contact and the side surface connected to the contact surface. The relay according to any one of the above.
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