JP4296715B2

JP4296715B2 - Switch

Info

Publication number: JP4296715B2
Application number: JP2001036322A
Authority: JP
Inventors: 徳男安東; 安生武本
Original assignee: Yaskawa Electric Corp
Current assignee: Yaskawa Electric Corp
Priority date: 2001-02-14
Filing date: 2001-02-14
Publication date: 2009-07-15
Anticipated expiration: 2021-02-14
Also published as: JP2002245881A

Description

【０００１】
【発明の属する技術分野】
本発明は、電力配電等に用いられる開閉器に関するものである。
【０００２】
【従来の技術】
従来の開閉器は、図３に示すように、開閉器枠体（図示せず）の内部に、固定電極部１と、可動電極部２とを備えて構成されている。
前記固定電極部１は、一端が円筒状に構成された固定電極３と、前記固定電極３の外周に、反固定電極側端面に耐弧材４を有する複数個の通電材５を円筒状に配列するとともに、固定電極側端部と反固定電極側端部のそれぞれの外周部に接触圧用バネ６ａ、６ｂを設けた固定電極接触子７とを有して構成されている。
前記可動電極部２は、可動電極本体８と、前記可動電極本体８と集電接触子９を介して通電するとともに、前記可動電極本体８の外周面上に軸方向に摺動可能に嵌挿された可動電極１０とを有して構成されている。１１ａ、１１ｂは、前記集電接触子９の外周に設けられた接触圧用バネである。
また、前記固定電極接触子７の可動電極１０との接触部は、円弧状に形成されているが、その曲率半径は、当接する可動電極１０および固定電極３の半径よりも小さく形成されている。
また、固定電極接触子７に取付られる固定電極側の接触圧用バネ６ａのバネ力は、可動電極側の接触圧用バネ６ｂのバネ力よりも強く設定されている。
したがって、固定電極接触子７と可動電極１０が係合した状態でのそれぞれの接触は、固定電極側が２点接触、可動電極側は１点接触となっている。
また、固定電極接触子７は、図４（ａ）、（ｂ）、（ｃ）に示すように、プレス成形された通電材５と機械加工された耐弧材４をロー付けして構成している。したがって、耐弧材４のコーナはエッジＥがある。
上述のように構成された開閉器は、図示しない駆動装置によって、前記可動電極を可動電極本体８をガイドにして矢印方向に摺動させて固定電極部の固定電極接触子との係合、非係合を行うことで電流の入、切を行うようになっている。
なお、図３は、固定電極接触子７と可動電極１０の係合状態（通電状態）を示し、この状態より可動電極１０が右側に動くことにより遮断状態となる。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の開閉器は、以下のような問題があった。
（１）図５に示すように、固定電極部接触子の可動電極との接触は、電流の流れを矢印で示すように、軸直角面で見て両端のどちらか１点での接触となっており、しかも接触点のどちらか片方（図５では右側）の通電材がないために、通電抵抗が大きくなり発熱する。
（２）固定電極接触子７を、プレス成形された通電材と機械加工された耐弧材とをロー付けして構成しているため、耐弧材のコーナにエッジが発生し、負荷遮断時や短絡点投入時にアークが発生し易く、かつアークが消えにくく、固定電極接触子７の寿命が短くなる。
（３）固定電極接触子と可動電極との挿入・引抜き時に、前記耐弧材のコーナエッジで可動電極にキズをつけ、通電信頼性を低下させるおそれがある。
本発明は、このような問題を解消するためになされたもので、固定電極接触子と可動電極との接触部の通電抵抗が小さく、ロスによる発熱を低減することができ、かつ固定電極接触子の寿命が長く、信頼性の高い開閉器を提供することを目的とするものである。
【０００４】
【課題を解決するための手段】
上記課題を解決するために、本発明は、一端が円筒状に構成された固定電極と、前記固定電極の外周に、反固定電極側端面に耐弧材を有する複数個の通電材を円筒状に配列するとともに、固定電極側端部と反固定電極側端部に接触圧用バネを設けた固定電極接触子とを有する固定電極部と、可動電極本体と、前記可動電極本体と集電接触子を介して通電するとともに、前記可動電極本体の外周面上に軸方向に摺動可能に嵌挿された可動電極とを有する可動電極部とからなり、前記可動電極を摺動させて固定電極部の固定電極接触子との係合、非係合を行うことで電流の入、切を行う開閉器において、前記固定電極接触子の、前記可動電極本体と接する側の面およびその反対側の面において前記耐弧材と前記通電材との段差をなくすとともに、前記耐弧材のコーナー部に円弧を形成してエッジをなくしたことを特徴とするものである。
【０００５】
【発明の実施の形態】
以下、本発明の実施例を図に基づいて説明する。
図１は、本発明の実施例における開閉器の固定電極接触子を示す図で、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。図２は固定電極接触子と、可動電極との接触状態を示す軸直角面詳細図である。
本発明にかかる開閉器の基本的な構成は、従来の開閉器の構成と変わらないが、固定電極接触子の構成が異なっている。
すなわち、本発明の固定電極接触子は、図１および図２に示すように、前記固定電極接触子の前記可動電極との接触部の曲率半径を、前記可動電極の半径よりも大きくするようにしている。
このようにすることにより、図２に示すように、固定電極接触子と可動電極との接触点は１点であるが、軸直角面で見て中央部で接触するので、接触部の接触子通電材を確保することができ、通電抵抗が低減される。なお、図２において、矢印は電流の流れを示している。
また、本発明の固定電極接触子は、前記固定電極接触子の耐弧材を通電材でうめ込み鋳造し、その後プレス成形することで、前記固定電極接触子の、前記可動電極本体と接する側の面およびその反対側の面において前記耐弧材と前記通電材との段差をなくすとともに、耐弧材の全てのコーナー部について、円弧Ｒを形成してエッジをなくすようにしている。
このようにすることにより、負荷遮断時や短絡点投入時にアークが発生しにくく、かつアークが消え易くなる。また、固定電極接触子７の寿命も長くなる。さらには、固定電極接触子と可動電極との挿入・引抜き時に、前記耐弧材のコーナエッジで可動電極にキズをつけることがなく、通電信頼性が高くなる。
【０００６】
【発明の効果】
以上述べたように、本発明によれば次のような効果がある。
（１）固定電極接触子と可動電極との接触部の通電抵抗を低減することができ、ロスによる発熱を低減できる。
（２）アークの発生時間が短くなり、固定電極接触子の寿命が長くなる。
【図面の簡単な説明】
【図１】本発明の実施例における開閉器の固定電極接触子を示す図で、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。
【図２】本発明における固定電極接触子と、可動電極との接触状態を示す軸直角面詳細図である。
【図３】従来の開閉器の要部を示す正断面図である。
【図４】従来の開閉器の固定電極接触子を示す図で、（ａ）は平面図、（ｂ）は正面図、（ｃ）は側面図である。
【図５】従来の開閉器における固定電極接触子と、可動電極との接触状態を示す軸直角面詳細図である。
【符号の説明】
１固定電極部、
２可動電極部、
３固定電極、
４耐弧材、
５通電材、
６ａ、６ｂ接触圧用バネ、
７固定電極接触子、
８可動電極本体、
９集電接触子、
１０可動電極
１１ａ、１１ｂ接触圧用バネ、
Ｅエッジ、
Ｒ円弧[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch used for power distribution and the like.
[0002]
[Prior art]
As shown in FIG. 3, the conventional switch includes a fixed electrode portion 1 and a movable electrode portion 2 inside a switch frame (not shown).
The fixed electrode portion 1 includes a fixed electrode 3 having one end formed in a cylindrical shape, and a plurality of current-carrying materials 5 having an arc-resistant material 4 on an outer surface of the fixed electrode 3 on the outer periphery of the fixed electrode 3 in a cylindrical shape. The fixed electrode contacts 7 are provided with contact pressure springs 6a and 6b on the outer periphery of each of the fixed electrode side end and the anti-fixed electrode side end.
The movable electrode portion 2 is energized through the movable electrode body 8, the movable electrode body 8 and the current collecting contact 9, and is slidably inserted in the axial direction on the outer peripheral surface of the movable electrode body 8. The movable electrode 10 is configured. Reference numerals 11 a and 11 b are contact pressure springs provided on the outer periphery of the current collecting contact 9.
Further, the contact portion of the fixed electrode contactor 7 with the movable electrode 10 is formed in an arc shape, but its radius of curvature is smaller than the radius of the movable electrode 10 and the fixed electrode 3 that are in contact with each other. .
The spring force of the contact pressure spring 6a on the fixed electrode side attached to the fixed electrode contact 7 is set to be stronger than the spring force of the contact pressure spring 6b on the movable electrode side.
Therefore, in the state in which the fixed electrode contact 7 and the movable electrode 10 are engaged, the contact is a two-point contact on the fixed electrode side and a one-point contact on the movable electrode side.
Further, as shown in FIGS. 4A, 4B, and 4C, the fixed electrode contact 7 is constituted by brazing the press-formed current-carrying material 5 and the machined arc-resistant material 4 together. ing. Therefore, the corner of the arc resistant material 4 has an edge E.
The switch configured as described above is configured so that the movable electrode is slid in the arrow direction with the movable electrode body 8 as a guide by a driving device (not shown) to engage with the fixed electrode contact of the fixed electrode portion. The current is turned on and off by engaging.
FIG. 3 shows an engaged state (energized state) between the fixed electrode contact 7 and the movable electrode 10, and the movable electrode 10 moves to the right from this state to be in a cut-off state.
[0003]
[Problems to be solved by the invention]
However, such a conventional switch has the following problems.
(1) As shown in FIG. 5, the contact of the fixed electrode contactor with the movable electrode is a contact at either one of the both ends as seen from the plane perpendicular to the axis, as indicated by the arrows. In addition, since there is no energizing material on either one of the contact points (right side in FIG. 5), the energizing resistance increases and heat is generated.
(2) Since the fixed electrode contactor 7 is formed by brazing a press-molded current-carrying material and a machined arc-proof material, an edge is generated at the corner of the arc-proof material and the load is interrupted. In addition, an arc is likely to occur when the short circuit point is turned on, and the arc is difficult to disappear, and the life of the fixed electrode contact 7 is shortened.
(3) At the time of insertion / extraction of the fixed electrode contactor and the movable electrode, the movable electrode may be scratched by the corner edge of the arc-resistant material, and the energization reliability may be reduced.
The present invention has been made to solve such a problem, and the conduction resistance of the contact portion between the fixed electrode contact and the movable electrode is small, heat generation due to loss can be reduced, and the fixed electrode contact The purpose of this invention is to provide a highly reliable switch with a long lifetime.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a cylindrical fixed electrode having a cylindrical end and a plurality of current-carrying materials having an arc-proof material on the end surface opposite to the fixed electrode on the outer periphery of the fixed electrode. A fixed electrode part having a fixed electrode contact provided with a contact pressure spring at the fixed electrode side end and the anti-fixed electrode side end, a movable electrode body, the movable electrode body and a current collecting contact And a movable electrode portion having a movable electrode slidably inserted in an axial direction on the outer peripheral surface of the movable electrode body, and the movable electrode is slid to fix the fixed electrode portion. In a switch that turns on / off current by engaging / disengaging with the fixed electrode contact of the fixed electrode contact, the surface of the fixed electrode contact that is in contact with the movable electrode body and the surface on the opposite side with eliminating a step between the energizing member and the anti-arcing material in, Forming a circular arc in the corner portion of the serial arc-proof material is characterized in that eliminate edge.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
1A and 1B are diagrams showing a fixed electrode contact of a switch according to an embodiment of the present invention, wherein FIG. 1A is a plan view, FIG. 1B is a front view, and FIG. 1C is a side view. FIG. 2 is a detailed view perpendicular to the axis showing the contact state between the fixed electrode contact and the movable electrode.
The basic configuration of the switch according to the present invention is the same as that of the conventional switch, but the configuration of the fixed electrode contactor is different.
That is, in the fixed electrode contactor of the present invention, as shown in FIGS. 1 and 2, the radius of curvature of the contact portion of the fixed electrode contactor with the movable electrode is made larger than the radius of the movable electrode. ing.
By doing so, as shown in FIG. 2, the contact point between the fixed electrode contactor and the movable electrode is one point, but since the contact is made at the center as viewed in the plane perpendicular to the axis, the contactor of the contact part An energization material can be secured, and energization resistance is reduced. In FIG. 2, the arrows indicate the flow of current.
Further, the fixed electrode contactor of the present invention is a side of the fixed electrode contactor that is in contact with the movable electrode body by immersing and casting the arc-resistant material of the fixed electrode contactor with a current-carrying material and then press-molding it. The step between the arc-resistant material and the current-carrying material is eliminated on the surface and the opposite surface, and an arc R is formed at every corner portion of the arc-resistant material to eliminate the edge.
By doing so, an arc is less likely to occur when a load is interrupted or a short-circuit point is turned on, and the arc is more likely to disappear. In addition, the life of the fixed electrode contact 7 is extended. Furthermore, when the fixed electrode contactor and the movable electrode are inserted and pulled out, the movable electrode is not damaged by the corner edge of the arc-resistant material, and the energization reliability is improved.
[0006]
【The invention's effect】
As described above, the present invention has the following effects.
(1) The energization resistance of the contact portion between the fixed electrode contact and the movable electrode can be reduced, and heat generation due to loss can be reduced.
(2) The generation time of the arc is shortened and the life of the fixed electrode contact is lengthened.
[Brief description of the drawings]
[1] a view showing a stationary electrode contact of that open閉器put to an embodiment of the present invention, (a) a plan view, the (b) is a front view, (c) is a side view.
FIG. 2 is a detailed view perpendicular to the axis showing a contact state between a fixed electrode contact and a movable electrode in the present invention.
FIG. 3 is a front sectional view showing a main part of a conventional switch.
4A and 4B are diagrams showing a fixed electrode contactor of a conventional switch, in which FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a side view.
FIG. 5 is a detailed view perpendicular to the axis showing a contact state between a fixed electrode contact and a movable electrode in a conventional switch.
[Explanation of symbols]
1 fixed electrode part,
2 movable electrode part,
3 fixed electrodes,
4 Arc resistant material,
5 conductive material,
6a, 6b spring for contact pressure,
7 fixed electrode contacts,
8 Movable electrode body,
9 Current collecting contact,
10 Movable electrodes 11a, 11b Contact pressure springs,
E edge,
R arc

Claims

A fixed electrode having one end formed in a cylindrical shape, and a plurality of current-carrying materials having an arc-resistant material on the end surface on the side opposite to the fixed electrode are arranged in a cylindrical shape on the outer periphery of the fixed electrode, A fixed electrode portion having a fixed electrode contactor provided with a spring for contact pressure at the fixed electrode side end; and
A movable electrode section having a movable electrode body, and a movable electrode that is energized through the movable electrode body and a current collecting contact and is slidably inserted in the axial direction on the outer peripheral surface of the movable electrode body; Consists of
In the switch for turning on and off the current by sliding the movable electrode to engage and disengage with the fixed electrode contact of the fixed electrode part,
The fixed electrode contactor is formed by pressing the arc-resistant material with an energizing material and then press-molded, and on the surface of the fixed electrode contactor in contact with the movable electrode main body and on the opposite surface thereof A switch that eliminates a step between the arc-resistant material and the current-carrying material and forms an arc at a corner portion of the arc-resistant material to eliminate an edge.