JP4488213B2

JP4488213B2 - Vacuum valve unit

Info

Publication number: JP4488213B2
Application number: JP2004554952A
Authority: JP
Inventors: 祐一山地; 雅史植主; 博美古賀; 忠広吉田; 康裕古閑; 周岡澤; 幸治佐野
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-11-28
Filing date: 2002-11-28
Publication date: 2010-06-23
Anticipated expiration: 2022-11-28
Also published as: JPWO2004049366A1; TW577103B; TW200410292A; WO2004049366A1

Description

本発明は、真空バルブユニットに関し、特に主回路電流を開閉する真空遮断器の真空バルブユニットに関するものである。 The present invention relates to a vacuum valve unit, and more particularly to a vacuum valve unit of a vacuum circuit breaker that opens and closes a main circuit current.

従来の真空遮断器に於いては、真空遮断器のフレーム上に操作機構と絶縁フレームに支持された真空バルブとが設けられている。真空バルブはその固定電極に接続された固定電極側主回路端子により絶縁フレームに支持され、可動電極側はシャント導体を介して可動電極側主回路端子に接続されている。可動電極は真空バルブと操作機構を電気的に絶縁する絶縁ロッドを介して操作機構に連結され、操作機構によって作動されて真空バルブの開閉を行う。主回路電流は、固定電極側主回路端子、真空バルブの固定電極、真空バルブの可動電極、可撓導体および可動電極側主回路端子により形成される電流路を通って流れる。
このような真空バルブユニットに於いては、主回路端子、真空バルブ及び可撓導体が気中にあり、金属間の絶縁距離を確保するために主回路端子間、主回路端子とフレーム間等の寸法が大きいものとなっている。また、相間絶縁距離を確保するため相間ピッチも金属間の絶縁距離を大きくとることが必要であった。更に、部品点数も多く、組立時間もかかっていた。
従って、本発明は上述の課題を解決するためになされたもので、真空遮断器の各部間を十分に絶縁して小型化した真空バルブユニットを提供することを目的とするものである。In the conventional vacuum circuit breaker, an operating mechanism and a vacuum valve supported by an insulating frame are provided on the frame of the vacuum circuit breaker. The vacuum valve is supported on the insulating frame by a fixed electrode side main circuit terminal connected to the fixed electrode, and the movable electrode side is connected to the movable electrode side main circuit terminal via a shunt conductor. The movable electrode is connected to the operation mechanism via an insulating rod that electrically insulates the vacuum valve and the operation mechanism, and is operated by the operation mechanism to open and close the vacuum valve. The main circuit current flows through a current path formed by the fixed electrode side main circuit terminal, the fixed electrode of the vacuum valve, the movable electrode of the vacuum valve, the flexible conductor, and the movable electrode side main circuit terminal.
In such a vacuum valve unit, the main circuit terminal, the vacuum valve, and the flexible conductor are in the air, and between the main circuit terminals, between the main circuit terminals and the frame, etc., in order to ensure the insulation distance between the metals. The dimensions are large. In addition, in order to secure the insulation distance between the phases, it is necessary to increase the insulation distance between the metal and the pitch between the phases. In addition, the number of parts is large and assembly time is also required.
Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vacuum valve unit that is miniaturized by sufficiently insulating parts of the vacuum circuit breaker.

本発明の真空バルブユニットは、真空バルブの可動電極棒に接続された可撓導体と、可動電極棒に連結された絶縁ロッドと、真空バルブを埋設支持し、固定側端子および可動側端子の外端を外部に露出させて埋設支持するモールド樹脂絶縁体とを備えている。モールド樹脂絶縁体は可動電極棒を収容する空洞を備え、可撓導体と、可動側端子の一端と、絶縁ロッドとがこの空洞内に収容されている。 The vacuum valve unit of the present invention includes a flexible conductor connected to the movable electrode rod of the vacuum valve, an insulating rod connected to the movable electrode rod, and a vacuum valve embedded and supported, and the outer side of the fixed side terminal and the movable side terminal. And a mold resin insulator that is embedded and supported with the end exposed to the outside. The mold resin insulator has a cavity for accommodating the movable electrode rod, and the flexible conductor, one end of the movable terminal, and the insulating rod are accommodated in the cavity.

図１は本発明の真空バルブユニットの一実施の形態を示す縦断面図である。
図２は図１の可撓導体の平面図である。
図３は図２の線３−３に沿った可撓導体の断面図である。
図４は本発明の真空バルブユニットの別の実施の形態を示す断面図である。FIG. 1 is a longitudinal sectional view showing an embodiment of a vacuum valve unit of the present invention.
FIG. 2 is a plan view of the flexible conductor of FIG.
FIG. 3 is a cross-sectional view of the flexible conductor taken along line 3-3 in FIG.
FIG. 4 is a sectional view showing another embodiment of the vacuum valve unit of the present invention.

実施の形態１．
第１図は真空遮断器に用いるこの発明の真空バルブユニットを示す縦断面図であり、例えば三相真空遮断器に於いては３台の真空バルブユニットを並設して用いる真空バルブユニットを一台だけ示したものである。真空バルブユニットは真空バルブ１を備えており、真空バルブ１は可動電極棒２の駆動により互いに離接させられる固定電極３および可動電極４を真空容器５内に持っている。真空バルブ１の固定電極３には一端（内端）が固定電極棒６を介して接続され、他端（外端）が図示してない外部回路に接続できる固定側端子７が設けられている。
可動電極棒２は真空容器５を貫通して延びていて、その外側部分にはフランジ８が固着され、フランジ８よりも外側（図で下方）の部分にはネジが切ってあってナット９がネジ係合している。ナット９とフランジ８との間には、可動電極棒２に嵌められたスパイダ状の可撓導体１０が設けられている。可撓導体１０は、図２および図３に示すように、可撓性の薄板状導電性金属材料を積層して形成したスパイダ状部材であり、中央の円板部分３１の穴３４には可動電極棒２が通され、フランジ８とナット９との間でしっかりと固定されている。円板部分からは例えば６本の脚部分３２が図示の如くＪ字型あるいは「し」字型に湾曲して径方向に延びて軸方向に立ち上がっている。脚部分３２の先端には径方向外側に延びる接続部３３が設けられていて、この接続部がネジ等の適当な固着手段により後に詳しく説明する可動側端子１１と共に真空バルブ１の固定用金属ブロック１ａに固着されている。可撓導体１０は主として脚部分３２で撓むので、脚部分３２は撓み部分でもある。図示の可撓導体１０は撓み部分として６本の脚部分３２を持つスパイダ状のものであるが、小型で十分な電流容量と可撓性が確保できれば、撓み部分としての脚部分３２の形状や本数は勿論、可撓導体１０自体の形状をもスポーク付きの車輪状のものやベローズ状のもの等に変更することができる。
可動側端子１１は、真空バルブ１の真空容器５の可動電極側の端部に設けられた導電性の環状部分１２と、環状部分１２から径方向外側に延びた接続導体１３と、接続導体１３上に接続された端子導体１４とを備えている。環状部分１２は真空バルブ１の可動電極棒２から離間してこれを同心に囲むように配置され、ボルト等の固着手段により可撓導体１０の湾曲した脚部の先端の接続部に接続されている。端子導体１４は真空バルブ１の軸心に平行に配置されていて、図示してない外部回路に接続できるようにしてある。この意味で可動側端子１１は一端（内端）で可撓導体１０に接続され、他端（外端）で外部回路に接続でき、可動側端子１１は真空バルブ１に対して離間しかつ固定されているにも拘わらず、間が可撓導体１０により接続されているので、電流通路を確保しながら可動電極棒２の軸方向の開閉運動を妨げることがない。
可動電極棒２の先端には、図示してない外部の操作機構に連結されて駆動され得る絶縁ロッド１５が連結されている。絶縁ロッド１５はエポキシ樹脂等の適当な絶縁材料で形成され、充電部である可動電極棒２を他の金属部分から絶縁する一方、機械的な作動力を伝達するためのものである。絶縁ロッド１５の外周面には沿面距離を増大させるためのシェッド（ｓｈｅｄ：傘）状の障壁１６が設けられ、この障壁１６により環状溝１７が形成されている。
絶縁ロッド１５の先端には更に、固定電極３と可動電極４との間に接触圧力を与えるように絶縁ロッド１５および可動電極棒２を介して可動電極４に接圧に相当する圧力を加える接圧ばね１８が設けられている。接圧ばね１８は、絶縁ロッド１５の先端に固着されて軸方向に延びた作動軸１９上で、作動軸１９に固着されたフランジ２０と作動軸１９上を摺動できるブラケット２１のばね座２２との間に設けられた圧縮ばねである。ブラケット２１は図示してない操作機構に連結させることができて、操作機構の駆動力を接圧ばね１８、絶縁ロッド１５および可動電極棒２を通して可動電極４に伝達することができる。
真空バルブユニットは更に、真空バルブ１を埋設支持し、固定側端子７および可動側端子１１の外端を外部に露出させて埋設支持するモールド樹脂絶縁体２３を備えている。モールド樹脂絶縁体２３は真空バルブ１の周囲に、真空バルブ１に接続された固定側端子７および可動側端子１１と共に、注型成形あるいはインサート成形された、エポキシ樹脂等の適当な樹脂の成形体であって、埋設支持した各部材間の位置関係を一定に維持すると共に、各部材間のまた他の機器との間の電気的絶縁を確保している。モールド樹脂絶縁体２３はまた真空遮断器のフレーム（図示してない）等に固定するための取付金具が埋設された固定用脚部２３ａを持っている。モールド樹脂絶縁体２３の真空バルブ１の真空容器５の可動側端部近傍には、可動電極棒２を離間してほぼ同心に囲む図で下方に延びる円筒状の障壁２４が設けられていて、この障壁２４により空洞２５が形成されている。この空洞２５には、可動電極棒２だけでなく、可動電極棒２に接続された可撓導体１０と、可撓導体１０に接続された可動側端子１１の一端である環状部分１２と、可動電極棒２に連結された絶縁ロッド１５の一部とが収容されている。このような障壁２４に形成された空洞２５内に真空バルブユニットの可動金属部分を収容することにより、この部分を障壁２４で囲んで沿面絶縁距離を大きくして十分な絶縁を確保することができる一方、可動電極棒２や可撓導体１０等の可動部分の作動を妨げることがないようにできる。
このような真空バルブユニットの電流通路は、固定側端子７−真空バルブ１の固定電極棒６−固定電極３−可動電極４−可動電極棒２−可撓導体１０−可動側端子１１の接続導体１３−端子導体１４の経路によって形成されている。
このように、この真空バルブユニットに於いては、固定側および可動側端子７および１１や真空バルブ１等がモールド樹脂絶縁体２３内に一体注型され、コンパクトな一体構造となっている。また、絶縁距離が満足するように真空バルブ１の可動電極棒２の側に絶縁障壁２４を設け、絶縁障壁２４の内側に形成された空洞２５内に小型化したスパイダ状の可撓導体１０を接続してある。さらに、空洞２５内で可動電極棒２に絶縁ロッド１５を接続し、接圧ばね１８を接続してある。
この構造により真空バルブ１が一体注型され、更に可撓導体１０、絶縁ロッド１５がモールド樹脂絶縁体２３の空洞２５内に設けられていることから、この真空バルブユニットの充電部で絶縁距離を確保する必要がある箇所は、固定側および可動側端子７および１１だけとなる。つまりこれらの端子７および１１の部分の絶縁距離が満足できる位置まで高さおよび相間ピッチを縮めることができ、真空バルブユニットおよびそれを用いた真空遮断器を小型化することができる。また、真空バルブを一体注型したことにより、部品点数が削減され、組立時間も削減される。
実施の形態２．
図４はこの発明の真空バルブユニットの別の実施の形態を示す。この真空バルブユニットに於いては、図１に示す真空バルブユニットに対して、絶縁ロッド４０および接圧ばね４１が絶縁ロッド１５および接圧ばね１８と異なっているが、その他の構成は同じである。
絶縁ロッド４０の外周面には沿面距離を増大させるための軸方向かつ周方向に延びたシェッド（傘）状の障壁１６が設けられ、この障壁１６により環状溝１７が形成されている。絶縁ロッド４０の更に先端部には、障壁１６と同様の軸方向かつ周方向に一体に延びた管状の第２の障壁４１が設けられ、環状溝状の空洞４２が形成されている。空洞４２の径方向内側の絶縁ロッド４０の円柱状部分４３の先端には、そこから軸方向に延びた作動軸４４が埋設されて設けられていて、この作動軸４４の先端部には作動軸４４上を摺動し得るブラケット４５が設けられている。ブラケット４５はばね座４６を有し、このばね座４６と絶縁ロッド４０の空洞４２即ち環状溝の底４７との間には圧縮ばねである接圧ばね４８が設けられている。この空洞４２内には接圧ばね４８およびそれに関連する部品が収容されているので、この空洞４２はばね空洞と呼ぶことができる。ブラケット４５は図示してない操作機構に連結させることができて、操作機構の駆動力を接圧ばね４８、絶縁ロッド４０および可動電極棒２を通して可動電極４に伝達することができる。
この構造によれば、接圧ばね４８の大部分が管状の障壁によって囲まれているので、真空バルブユニットの各部間の絶縁が更に有利になり、更に小型化することができる。Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view showing a vacuum valve unit of the present invention used for a vacuum circuit breaker. For example, in a three-phase vacuum circuit breaker, three vacuum valve units used in parallel are used. Only the table is shown. The vacuum valve unit includes a vacuum valve 1, and the vacuum valve 1 has a fixed electrode 3 and a movable electrode 4 that can be separated from each other by driving a movable electrode rod 2 in a vacuum vessel 5. One end (inner end) is connected to the fixed electrode 3 of the vacuum valve 1 via a fixed electrode rod 6, and the other end (outer end) is provided with a fixed terminal 7 that can be connected to an external circuit (not shown). .
The movable electrode rod 2 extends through the vacuum vessel 5, and a flange 8 is fixed to an outer portion thereof, and a screw is cut on a portion outside the flange 8 (downward in the drawing) so that a nut 9 is provided. The screw is engaged. A spider-like flexible conductor 10 fitted to the movable electrode rod 2 is provided between the nut 9 and the flange 8. As shown in FIGS. 2 and 3, the flexible conductor 10 is a spider-like member formed by laminating flexible thin plate-like conductive metal materials, and is movable in the hole 34 of the central disc portion 31. The electrode rod 2 is passed through and is firmly fixed between the flange 8 and the nut 9. From the disc portion, for example, six leg portions 32 are curved in a J-shape or “shi” -shape as shown in the drawing, extend in the radial direction, and rise in the axial direction. A connecting portion 33 extending radially outward is provided at the distal end of the leg portion 32, and this connecting portion is fixed to the metal block for fixing the vacuum valve 1 together with the movable terminal 11 which will be described in detail later by appropriate fixing means such as screws. It is fixed to 1a. Since the flexible conductor 10 is bent mainly at the leg portion 32, the leg portion 32 is also a bent portion. The illustrated flexible conductor 10 has a spider shape having six leg portions 32 as bent portions. However, if a small and sufficient current capacity and flexibility can be ensured, the shape of the leg portion 32 as the bent portion and Of course, the shape of the flexible conductor 10 itself can be changed to a wheel-like one with a spoke or a bellows-like one.
The movable terminal 11 includes a conductive annular portion 12 provided at the end of the vacuum vessel 1 on the movable electrode side of the vacuum valve 1, a connection conductor 13 extending radially outward from the annular portion 12, and a connection conductor 13. And a terminal conductor 14 connected to the top. The annular portion 12 is disposed so as to be concentrically spaced apart from the movable electrode rod 2 of the vacuum bulb 1, and is connected to a connection portion at the tip of the curved leg portion of the flexible conductor 10 by a fixing means such as a bolt. Yes. The terminal conductor 14 is disposed parallel to the axis of the vacuum valve 1 so that it can be connected to an external circuit (not shown). In this sense, the movable terminal 11 is connected to the flexible conductor 10 at one end (inner end) and can be connected to an external circuit at the other end (outer end), and the movable terminal 11 is separated and fixed with respect to the vacuum valve 1. In spite of this, since the gap is connected by the flexible conductor 10, the opening and closing movement of the movable electrode rod 2 in the axial direction is not hindered while securing a current path.
An insulating rod 15 that can be driven by being connected to an external operation mechanism (not shown) is connected to the tip of the movable electrode rod 2. The insulating rod 15 is formed of an appropriate insulating material such as an epoxy resin, and insulates the movable electrode rod 2 as a charging part from other metal parts, while transmitting a mechanical operating force. On the outer peripheral surface of the insulating rod 15, a shed-like barrier 16 for increasing the creeping distance is provided, and an annular groove 17 is formed by the barrier 16.
Further, a contact corresponding to a pressure corresponding to the contact pressure is applied to the movable electrode 4 via the insulation rod 15 and the movable electrode rod 2 so that a contact pressure is applied between the fixed electrode 3 and the movable electrode 4 at the tip of the insulation rod 15. A pressure spring 18 is provided. The contact pressure spring 18 is fixed to the tip of the insulating rod 15 and extends on the operating shaft 19 in the axial direction. The flange 20 is fixed to the operating shaft 19 and the spring seat 22 of the bracket 21 that can slide on the operating shaft 19. Is a compression spring provided between the two. The bracket 21 can be connected to an operating mechanism (not shown), and the driving force of the operating mechanism can be transmitted to the movable electrode 4 through the contact pressure spring 18, the insulating rod 15 and the movable electrode rod 2.
The vacuum valve unit further includes a mold resin insulator 23 that embeds and supports the vacuum valve 1 and that embeds and supports the outer ends of the fixed side terminal 7 and the movable side terminal 11 exposed to the outside. The molded resin insulator 23 is cast or insert-molded together with the fixed-side terminal 7 and the movable-side terminal 11 connected to the vacuum valve 1 around the vacuum valve 1 and is molded from an appropriate resin such as an epoxy resin. And while maintaining the positional relationship between each member embed | buried and supported constant, the electrical insulation between each member and another apparatus is ensured. The mold resin insulator 23 also has a fixing leg 23a in which a mounting bracket for fixing to a frame (not shown) of the vacuum circuit breaker is embedded. In the vicinity of the movable side end of the vacuum vessel 5 of the vacuum valve 1 of the mold resin insulator 23, a cylindrical barrier 24 extending downward in the figure surrounding the movable electrode rod 2 in a substantially concentric manner is provided. A cavity 25 is formed by the barrier 24. In this cavity 25, not only the movable electrode rod 2 but also the flexible conductor 10 connected to the movable electrode rod 2, the annular portion 12 that is one end of the movable side terminal 11 connected to the flexible conductor 10, and a movable A part of the insulating rod 15 connected to the electrode rod 2 is accommodated. By accommodating the movable metal portion of the vacuum valve unit in the cavity 25 formed in such a barrier 24, this portion can be surrounded by the barrier 24 to increase the creeping insulation distance and ensure sufficient insulation. On the other hand, the operation of movable parts such as the movable electrode rod 2 and the flexible conductor 10 can be prevented from being hindered.
The current path of the vacuum valve unit is such that the fixed terminal 7 -the fixed electrode rod 6 of the vacuum valve 1 -the fixed electrode 3 -the movable electrode 4 -the movable electrode rod 2 -the flexible conductor 10 -the connecting conductor of the movable side terminal 11 13-formed by the path of the terminal conductor 14.
Thus, in this vacuum valve unit, the fixed side and movable side terminals 7 and 11, the vacuum valve 1 and the like are integrally cast in the molded resin insulator 23 to form a compact integrated structure. Further, an insulating barrier 24 is provided on the movable electrode rod 2 side of the vacuum valve 1 so that the insulating distance is satisfied, and the spider-like flexible conductor 10 reduced in size is formed in a cavity 25 formed inside the insulating barrier 24. Connected. Furthermore, the insulating rod 15 is connected to the movable electrode rod 2 in the cavity 25, and the contact pressure spring 18 is connected.
With this structure, the vacuum valve 1 is integrally cast, and further, the flexible conductor 10 and the insulating rod 15 are provided in the cavity 25 of the mold resin insulator 23. Only the fixed side and movable side terminals 7 and 11 need to be secured. That is, the height and the interphase pitch can be reduced to a position where the insulation distance between the terminals 7 and 11 can be satisfied, and the vacuum valve unit and the vacuum circuit breaker using the same can be miniaturized. In addition, by integrally casting the vacuum valve, the number of parts is reduced and the assembly time is also reduced.
Embodiment 2. FIG.
FIG. 4 shows another embodiment of the vacuum valve unit of the present invention. In this vacuum valve unit, the insulating rod 40 and the contact pressure spring 41 are different from the insulation rod 15 and the contact pressure spring 18 with respect to the vacuum valve unit shown in FIG. .
A shed-like barrier 16 extending in the axial direction and the circumferential direction for increasing the creeping distance is provided on the outer peripheral surface of the insulating rod 40, and an annular groove 17 is formed by the barrier 16. A tubular second barrier 41 extending integrally in the axial direction and circumferential direction similar to the barrier 16 is provided at the distal end portion of the insulating rod 40, and an annular groove-shaped cavity 42 is formed. An operating shaft 44 extending in the axial direction is embedded in the tip of the cylindrical portion 43 of the insulating rod 40 on the radially inner side of the cavity 42. A bracket 45 that can slide on the upper surface 44 is provided. The bracket 45 has a spring seat 46, and a contact pressure spring 48, which is a compression spring, is provided between the spring seat 46 and the cavity 42 of the insulating rod 40, that is, the bottom 47 of the annular groove. Since the contact pressure spring 48 and related parts are accommodated in the cavity 42, the cavity 42 can be called a spring cavity. The bracket 45 can be connected to an operating mechanism (not shown), and the driving force of the operating mechanism can be transmitted to the movable electrode 4 through the contact pressure spring 48, the insulating rod 40 and the movable electrode rod 2.
According to this structure, since most of the contact pressure spring 48 is surrounded by the tubular barrier, the insulation between each part of the vacuum valve unit becomes more advantageous, and the size can be further reduced.

Claims

A vacuum valve having a fixed electrode and a movable electrode which are separated from each other by driving a movable electrode rod;
A fixed-side terminal connected to the fixed electrode at one end and connected to an external circuit at the other end;
A flexible conductor connected to the movable electrode rod;
A movable terminal connected to the flexible conductor at one end and connected to an external circuit at the other end;
An insulating rod that is connected to the movable electrode rod at one end and connected to an external operating mechanism at the other end;
A contact pressure spring connected to the insulating rod and applying contact pressure to the movable electrode;
The vacuum valve is embedded and supported, and includes a mold resin insulator that supports the embedded side by exposing the outer ends of the fixed side terminal and the movable side terminal to the outside,
The mold resin insulator includes a cavity for accommodating the movable electrode rod, the flexible conductor connected to the movable electrode rod, one end of the movable terminal connected to the flexible conductor, and the movable electrode An insulating rod connected to a rod is housed in the cavity,
The one end of the movable terminal has an annular portion that surrounds the movable electrode bar in a spaced manner, and the flexible conductor is formed integrally with the central portion connected to the movable electrode rod and the central portion, A curved bent portion extending in a radial direction from a central portion; and a connecting portion provided at a radially outer end of the bent portion and connected to the annular portion of the movable terminal. Vacuum valve unit.

The vacuum valve unit according to claim 1, wherein the cavity is formed by being surrounded by a tubular barrier integrally extending from the main body of the molded resin insulator.

The vacuum valve unit according to claim 1 or 2, wherein the insulating rod includes a spring cavity, and the contact pressure spring is accommodated in the spring cavity.

The vacuum valve unit according to claim 3, wherein the spring cavity of the insulating rod is formed by being surrounded by a tubular barrier integrally extending from the main body of the insulating rod.