JP6250965B2 - Resin insulated vacuum valve - Google Patents

Resin insulated vacuum valve Download PDF

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JP6250965B2
JP6250965B2 JP2013141174A JP2013141174A JP6250965B2 JP 6250965 B2 JP6250965 B2 JP 6250965B2 JP 2013141174 A JP2013141174 A JP 2013141174A JP 2013141174 A JP2013141174 A JP 2013141174A JP 6250965 B2 JP6250965 B2 JP 6250965B2
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vacuum valve
resin
ring plate
movable
electric field
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JP2015015155A (en
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今井　隆浩
隆浩 今井
勇介 中村
勇介 中村
顕一 山崎
顕一 山崎
玄 小宮
玄 小宮
竹内　美和
美和 竹内
前田　照彦
照彦 前田
直紀 浅利
直紀 浅利
木下　晋
晋 木下
治 多賀谷
治 多賀谷
義博 竹井
義博 竹井
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Toshiba Corp
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Toshiba Corp
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Description

本発明の実施形態は、真空バルブの外周をエポキシ樹脂のような絶縁材料でモールドした樹脂絶縁真空バルブに関する。   Embodiments of the present invention relate to a resin-insulated vacuum valve in which the outer periphery of a vacuum valve is molded with an insulating material such as an epoxy resin.

最近、ＳＦ６ガスのような絶縁ガスを用いたガス絶縁方式に替わり、エポキシ樹脂を用いた固体絶縁方式のスイッチギヤが環境調和型として採用されている。真空バルブにおいても、外周がエポキシ樹脂でモールドされ、外部絶縁の補強が行われている（例えば、特許文献１参照。）。   Recently, instead of a gas insulation system using an insulating gas such as SF6 gas, a solid insulation system switchgear using an epoxy resin has been adopted as an environmentally conscious type. Also in the vacuum valve, the outer periphery is molded with an epoxy resin to reinforce external insulation (see, for example, Patent Document 1).

この種の樹脂絶縁真空バルブを図４に示すが、アルミナ磁器よりなる筒状の真空絶縁容器１の両端開口部には、円板状の固定側封着金具２、可動側封着金具３が封着されている。固定側封着金具２の中央部には、固定側通電軸４が貫通固定され、真空絶縁容器１内の端部に固定側接点５が固着されている。固定側接点５に対向し、接離自在の可動側接点６が可動側封着金具３の中央開口部を移動自在に貫通する可動側通電軸７の端部に固着されている。可動側通電軸７の中間部には、伸縮自在の筒状のベローズ８の自由端が封着され、固定端が可動側封着金具３の中央開口部に封着されている。接点５、６の外周には、筒状のアークシールド９が設けられ、金属蒸気の捕捉が行われている。これらにより、真空バルブが構成されている。   A resin-insulated vacuum valve of this type is shown in FIG. 4, and a disk-like fixed-side sealing metal fitting 2 and a movable-side sealing metal fitting 3 are provided at both ends of a cylindrical vacuum insulating container 1 made of alumina porcelain. Sealed. A fixed-side energizing shaft 4 is penetrated and fixed at the center of the fixed-side sealing fitting 2, and a fixed-side contact 5 is fixed to an end portion in the vacuum insulating container 1. Opposite to the fixed side contact 5, a movable side contact 6 that is detachable is fixed to the end of the movable side energizing shaft 7 that movably penetrates the central opening of the movable side sealing fitting 3. A free end of a telescopic cylindrical bellows 8 is sealed at an intermediate portion of the movable side energizing shaft 7, and a fixed end is sealed at a central opening of the movable side sealing fitting 3. A cylindrical arc shield 9 is provided on the outer periphery of the contacts 5 and 6 to capture the metal vapor. These constitute a vacuum valve.

固定側封着金具２には、外周端部を囲むように、碗状の固定側電界緩和シールド１０が設けられている。固定側電界緩和シールド１０は、固定側封着金具２に接して半径方向に広がった円板部１０ａ、円板部１０ａに連接し、略９０度曲折して軸方向と平行に伸びた筒部１０ｂ、筒部１０ｂに連接し、所定の曲率を持って曲折された断面Ｕ字状の湾曲部１０ｃで構成されている。可動側封着金具３の外周端部にも、固定側電界緩和シールド１０と同様の碗状の可動側電界緩和シールド１１が設けられている。可動側電界緩和シールド１１は、可動側封着金具３と所定の間隔を持って半径方向に広がった円板部１１ａ、円板部１１ａに連接し、略９０度曲折して軸方向と平行に伸びた筒部１１ｂ、筒部１１ｂに連接し、所定の曲率を持って曲折された断面Ｕ字状の湾曲部１１ｃで構成されている。湾曲部１０ｃ、１１ｃの内周面は、それぞれ真空絶縁容器１と所定の間隔を保っている。   The fixed-side sealing fitting 2 is provided with a bowl-shaped fixed-side electric field relaxation shield 10 so as to surround the outer peripheral end portion. The fixed-side electric field relaxation shield 10 is in contact with the fixed-side sealing fitting 2 and is connected to the circular plate portion 10a and the circular plate portion 10a. The cylindrical portion is bent approximately 90 degrees and extends parallel to the axial direction. 10b, and is composed of a curved portion 10c having a U-shaped cross section that is connected to the cylindrical portion 10b and is bent with a predetermined curvature. A hook-like movable-side electric field relaxation shield 11 similar to the fixed-side electric field relaxation shield 10 is also provided at the outer peripheral end of the movable-side sealing metal fitting 3. The movable-side electric field relaxation shield 11 is connected to the disk-side portion 11a and the disk-shaped portion 11a that are spread in the radial direction with a predetermined distance from the movable-side sealing metal fitting 3, and is bent approximately 90 degrees to be parallel to the axial direction. The extended cylindrical part 11b is connected to the cylindrical part 11b, and is constituted by a curved part 11c having a U-shaped cross section bent with a predetermined curvature. The inner peripheral surfaces of the bending portions 10c and 11c are kept at a predetermined distance from the vacuum insulating container 1, respectively.

可動側電界緩和シールド１１の円板部１１ａの内周部には、可動側通電軸７を囲むように、筒状の樹脂浸入防止管１２が設けられている。可動側封着金具３と円板部１１ａ間には、導電性のＯリング１３が設けられ、モールド時にエポキシ樹脂が可動側通電軸７側に浸入しないようになっている。真空バルブの外周には、エポキシ樹脂でモールドした絶縁層１４が設けられている。絶縁層１４の両端部は、テーパ状の界面接続部となっている。絶縁層１４の外周には、界面接続部を除いて導電性塗料を塗布した接地層１５が設けられている。   A cylindrical resin intrusion prevention tube 12 is provided on the inner peripheral portion of the disc portion 11 a of the movable-side electric field relaxation shield 11 so as to surround the movable-side conductive shaft 7. A conductive O-ring 13 is provided between the movable side sealing fitting 3 and the disk portion 11a so that epoxy resin does not enter the movable side energizing shaft 7 side during molding. An insulating layer 14 molded with an epoxy resin is provided on the outer periphery of the vacuum valve. Both end portions of the insulating layer 14 are tapered interface connection portions. On the outer periphery of the insulating layer 14, a ground layer 15 to which a conductive paint is applied except for the interface connection portion is provided.

次に、モールド時について、図５を参照して説明する。   Next, the molding will be described with reference to FIG.

注型金型に真空バルブの固定側通電軸４や可動側通電軸７などを固定し、Ｏリング１３を介した可動側電界緩和シールド１１を装着するものの、Ｏリング１３の圧縮程度が円周方向で不安定であると、円板部１１ａと可動側封着金具３の平行がとれないことがある。図５では、誇張して示しているが、円板部１１ａが図示右下がりとなっている。すると、右側では、Ｏリング１３の圧縮が小さく、筒部１１ｂが接地層１５方向に傾斜して絶縁層１４の絶縁厚さが薄くなり、耐電圧特性の低下を招くことになる。左側では、Ｏリング１３が大きく圧縮され、湾曲部１１ｃと真空絶縁容器１の間隔が狭くなり、微小ギャップとなって、電界強度が上昇するとともに、内部応力が上昇することになる。このため、可動側電界緩和シールド１１を可動側封着金具３に略平行して配置することができ、絶縁層１４の絶縁厚さや、真空絶縁容器１との間隔を全周にわたって均一に保つことのできるものが望まれていた。   Although the fixed energizing shaft 4 and the movable energizing shaft 7 of the vacuum valve are fixed to the casting mold and the movable-side electric field relaxation shield 11 is mounted via the O-ring 13, the compression degree of the O-ring 13 is circumferential. If the direction is unstable, the disk part 11a and the movable side sealing fitting 3 may not be parallel. In FIG. 5, although exaggerated, the disk portion 11 a is downwardly shown in the figure. Then, on the right side, the compression of the O-ring 13 is small, the cylindrical portion 11b is inclined toward the ground layer 15 and the insulating thickness of the insulating layer 14 is reduced, leading to a decrease in the withstand voltage characteristic. On the left side, the O-ring 13 is greatly compressed, the interval between the curved portion 11c and the vacuum insulating container 1 is narrowed, forming a minute gap, the electric field strength is increased, and the internal stress is increased. For this reason, the movable-side electric field relaxation shield 11 can be disposed substantially parallel to the movable-side sealing metal fitting 3, and the insulating thickness of the insulating layer 14 and the distance from the vacuum insulating container 1 can be kept uniform over the entire circumference. What could be done was desired.

特開２００９−１９３７３４号公報JP 2009-193734 A

本発明が解決しようとする課題は、可動側電界緩和シールド１１の円板部１１ａを可動側封着金具３と略平行に配置し、絶縁層１４の絶縁厚さや、真空絶縁容器１との間隔を全周にわたって均一に保ち、電界強度や内部応力の上昇を抑えて絶縁特性を向上し得る樹脂絶縁真空バルブを提供することにある。   The problem to be solved by the present invention is that the disk portion 11a of the movable-side electric field relaxation shield 11 is disposed substantially parallel to the movable-side sealing fitting 3, and the insulating thickness of the insulating layer 14 and the distance from the vacuum insulating container 1 Is to provide a resin-insulated vacuum valve that can improve the insulation characteristics by keeping the electric field strength uniform over the entire circumference and suppressing the increase in electric field strength and internal stress.

上記課題を解決するために、実施形態の樹脂絶縁真空バルブは、真空絶縁容器、接離自在の一対の接点、封着金具を有する真空バルブと、前記封着金具を囲むように配置される半径方向に広がった円板部、前記円板部に連接され軸方向に伸びた筒部、前記筒部に連接され端部が曲折された湾曲部で構成される電界緩和シールドと、前記円板部に固定されるとともに、前記封着金具に全周が当接する第１のリング板と、前記第１のリング板の外周に設けられるとともに、前記円板部と前記封着金具とで全周が圧縮される弾性部材と、前記真空バルブの外周に設けられた絶縁層と、前記絶縁層の外周に設けられた接地層とを備え、前記第１のリング板、前記弾性部材を少なくとも前記真空バルブの可動側に用いたことを特徴とする。 In order to solve the above-described problems, a resin insulated vacuum valve according to an embodiment includes a vacuum insulated container, a pair of contactable and separable contacts, a vacuum valve having a sealing metal fitting, and a radius arranged to surround the sealing metal fitting. An electric field relaxation shield composed of a disc portion extending in a direction, a cylindrical portion connected to the disc portion and extending in the axial direction, a curved portion connected to the cylindrical portion and bent at an end, and the disc portion a is fixed, a first ring plate the entire circumference abut on the sealing fitting is provided in an outer periphery of the first ring plate, the entire periphery between the disc portion and the sealing fitting An elastic member to be compressed; an insulating layer provided on an outer periphery of the vacuum valve; and a grounding layer provided on an outer periphery of the insulating layer, wherein the first ring plate and the elastic member are at least the vacuum valve. It is used for the movable side of the.

本発明の実施例１に係る樹脂絶縁真空バルブの構成を示す要部拡大断面図。The principal part expanded sectional view which shows the structure of the resin insulation vacuum valve which concerns on Example 1 of this invention. 本発明の実施例２に係る樹脂絶縁真空バルブの構成を示す要部拡大断面図。The principal part expanded sectional view which shows the structure of the resin insulation vacuum valve which concerns on Example 2 of this invention. 本発明の実施例３に係る樹脂絶縁真空バルブの構成を示す要部拡大断面図。The principal part expanded sectional view which shows the structure of the resin insulation vacuum valve which concerns on Example 3 of this invention. 従来の樹脂絶縁真空バルブの構成を示す断面図。Sectional drawing which shows the structure of the conventional resin insulation vacuum valve. 従来の樹脂絶縁真空バルブの構成を示す要部拡大断面図。The principal part expanded sectional view which shows the structure of the conventional resin insulation vacuum valve.

以下、図面を参照して本発明の実施例を説明する。   Embodiments of the present invention will be described below with reference to the drawings.

先ず、本発明の実施例１に係る樹脂絶縁真空バルブを図１を参照して説明する。図１は、本発明の実施例１に係る樹脂絶縁真空バルブの構成を示す要部拡大断面図である。なお、樹脂絶縁真空バルブの構成は、可動側を除き、従来と同様であるので、全体の説明を省略する。また、従来と同様の構成部分は、同一符号を付した。   First, a resin insulated vacuum valve according to Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is an enlarged cross-sectional view of a main part showing the configuration of a resin-insulated vacuum valve according to Embodiment 1 of the present invention. Note that the configuration of the resin-insulated vacuum valve is the same as that of the prior art except for the movable side, so the entire description is omitted. Moreover, the same components as those in the prior art are denoted by the same reference numerals.

図１に示すように、可動側電界緩和シールド１１の円板部１１ａには、断面矩形状で環状の第１のリング板２０を同軸上に固定している。第１のリンク板２０の外径は、可動側封着金具３の外径よりも小さい。第１のリング板２０の外周には、Ｏリング１３が設けられ、円板部１１ａと可動側封着金具３端部間で圧縮されるようになっている。第１のリング板２０の高さは、図示上面が可動側封着金具３に当接したとき、Ｏリング１３が１０〜２０％の範囲で圧縮されるように調整されている。内径は、可動側通電軸７の外径よりも大きい。   As shown in FIG. 1, an annular first ring plate 20 having a rectangular cross section is coaxially fixed to the disc portion 11 a of the movable-side electric field relaxation shield 11. The outer diameter of the first link plate 20 is smaller than the outer diameter of the movable side sealing fitting 3. An O-ring 13 is provided on the outer periphery of the first ring plate 20, and is compressed between the disc portion 11a and the end of the movable side sealing fitting 3. The height of the first ring plate 20 is adjusted so that the O-ring 13 is compressed within a range of 10 to 20% when the upper surface in the drawing abuts against the movable side sealing fitting 3. The inner diameter is larger than the outer diameter of the movable energizing shaft 7.

真空絶縁容器１の外周には、従来と同様に、絶縁層１４が設けられ、その外周に接地層１５が設けられている。円板部１１ａの内周には、可動側通電軸７を囲むように樹脂浸入防止管１２が設けられている。   An insulating layer 14 is provided on the outer periphery of the vacuum insulating container 1 as in the prior art, and a ground layer 15 is provided on the outer periphery thereof. A resin intrusion prevention pipe 12 is provided on the inner periphery of the disc portion 11a so as to surround the movable side energizing shaft 7.

モールド時には、第１のリング板２０の全周を可動側封着金具３に当接させた状態で注型金型に固定する。即ち、可動側電界緩和シールド１１を可動側封着金具３に押し付け、Ｏリング１３の全周を均一に圧縮した状態とする。そして、エポキシ樹脂をキャビティーに注入して加熱硬化させ、絶縁層１４を形成する。これにより、円板部１１ａと可動側封着金具３の平行度が向上し、筒部１１ｂ、湾曲部１１ｃが同軸上に配置される。筒部１１ｂから接地層１５までの絶縁厚さ、および真空絶縁容器１と湾曲部１１ｃの間隔は、全周にわたって均一なものとなる。また、Ｏリング１３の全周を均一に圧縮しているので、可動側通電軸７側への樹脂の浸入を確実に防止することができる。   At the time of molding, the entire circumference of the first ring plate 20 is fixed to the casting mold while being in contact with the movable side sealing fitting 3. That is, the movable-side electric field relaxation shield 11 is pressed against the movable-side sealing metal fitting 3 so that the entire circumference of the O-ring 13 is uniformly compressed. Then, an epoxy resin is injected into the cavity and cured by heating to form the insulating layer 14. Thereby, the parallelism of the disc part 11a and the movable side sealing metal fitting 3 improves, and the cylinder part 11b and the curved part 11c are arrange | positioned coaxially. The insulation thickness from the cylindrical portion 11b to the ground layer 15 and the distance between the vacuum insulating container 1 and the curved portion 11c are uniform over the entire circumference. Further, since the entire circumference of the O-ring 13 is uniformly compressed, it is possible to reliably prevent the resin from entering the movable side energizing shaft 7 side.

なお、モールドにあたって、真空絶縁容器１は、例えばサンドブラスト処理により粗面化し、シランカップリング剤のような表面改質剤を塗布し、また、可動側封着金具３は、粗面化後、エポキシ樹脂とダイマー酸により構成されるプライマー処理を施こすことが好ましい。更に、エポキシ樹脂には、ビスフェノールＡ型、あるいはビスフェノールＦ型と酸無水物硬化剤とシリカ粒子の組合せを用い、熱膨張率を約１．８×１０−５（１／Ｋ）とする。可動側電界緩和シールド１１、第１のリング板２０には、このモールド樹脂と同程度の熱膨張率を有する真鍮などの銅合金を用いることが応力緩和上、好ましい。 In the molding, the vacuum insulating container 1 is roughened by, for example, sandblasting, and a surface modifier such as a silane coupling agent is applied, and the movable-side sealing metal fitting 3 is epoxy-coated after roughening. It is preferable to apply a primer treatment composed of a resin and dimer acid. Furthermore, the epoxy resin uses a combination of bisphenol A type or bisphenol F type, an acid anhydride curing agent and silica particles, and has a thermal expansion coefficient of about 1.8 × 10 −5 (1 / K). In terms of stress relaxation, it is preferable to use a copper alloy such as brass having a thermal expansion coefficient comparable to that of the mold resin for the movable-side electric field relaxation shield 11 and the first ring plate 20.

これらの結果、部分放電開始電圧は、従来に比べて実験値で約５０％向上した。また、湾曲部１１ｃ先端の応力は、解析値で１ｍｍ偏芯させると約２０％上昇する。供試した真空バルブは外径φ１５０ｍｍ、絶縁層１４の絶縁厚さは３５ｍｍ、湾曲部１１ｃと真空絶縁容器１の間隔は５ｍｍ、第１のリング板２０の高さは３ｍｍである。   As a result, the partial discharge start voltage was improved by about 50% in experimental values compared to the conventional case. Further, the stress at the tip of the bending portion 11c increases by about 20% when the analytical value is decentered by 1 mm. The tested vacuum valve has an outer diameter of 150 mm, the insulating layer 14 has an insulating thickness of 35 mm, the distance between the curved portion 11c and the vacuum insulating container 1 is 5 mm, and the height of the first ring plate 20 is 3 mm.

なお、固定側電界緩和シールドは、固定側封着金具や固定側通電軸に固定され、同軸上に配置されるが、可動側と同様に、Ｏリング１３と第１のリング板２０を用いて固定することができる。このため、Ｏリング１３と第１のリング板２０は、少なくとも可動側に用いるものとなる。   The fixed-side electric field relaxation shield is fixed to the fixed-side sealing metal fitting or the fixed-side energizing shaft and is arranged on the same axis. However, similarly to the movable side, the O-ring 13 and the first ring plate 20 are used. Can be fixed. For this reason, the O-ring 13 and the first ring plate 20 are used at least on the movable side.

また、Ｏリング１３に替えて、導電性のゴムパッキンを用いてもよい。これらを、弾性部材と称する。弾性部材は、モールド時の温度に耐える耐熱性を有していることは勿論であるが、中空のものを用いると、小さい圧縮力で全周を圧縮することができ、第１のリング板２０を容易に可動側封着金具３に当接させることができる。   Further, instead of the O-ring 13, a conductive rubber packing may be used. These are called elastic members. Of course, the elastic member has heat resistance that can withstand the temperature at the time of molding, but if a hollow member is used, the entire circumference can be compressed with a small compression force, and the first ring plate 20 can be compressed. Can be easily brought into contact with the movable-side sealing fitting 3.

上記実施例１の樹脂絶縁真空バルブによれば、可動側電界緩和シールド１１の円板部１１ａに第１のリング板２０を設け、この全周が可動側封着金具３に当接するまでＯリング１３を圧縮するようにしているので、円板部１１ａと可動側封着金具３の平行度が向上し、筒部１１ｂと湾曲部１１ｃを真空バルブの同軸上に配置することができる。そして、筒部１１ｂから接地層１５までの絶縁厚さ、および真空絶縁容器１と湾曲部１１ｃの間隔を全周にわたって均一なものとすることができ、絶縁特性や内部応力特性を向上させることができる。   According to the resin-insulated vacuum valve of the first embodiment, the first ring plate 20 is provided on the disc portion 11a of the movable-side electric field relaxation shield 11, and the O-ring is provided until the entire circumference contacts the movable-side sealing fitting 3. Since 13 is compressed, the parallelism of the disc part 11a and the movable side sealing metal fitting 3 improves, and the cylinder part 11b and the curved part 11c can be arrange | positioned on the coaxial of a vacuum valve. And the insulation thickness from the cylinder part 11b to the grounding layer 15, and the space | interval of the vacuum insulation container 1 and the curved part 11c can be made uniform over a perimeter, and an insulation characteristic and an internal stress characteristic can be improved. it can.

次に、本発明の実施例２に係る樹脂絶縁真空バルブを図２を参照して説明する。図２は、本発明の実施例２に係る樹脂絶縁真空バルブの構成を示す要部拡大断面図である。なお、この実施例２が実施例１と異なる点は、湾曲部を断面Ｕ字状から断面円状としたことである。図２において、実施例１と同様の構成部分においては、同一符号を付し、その詳細な説明を省略する。   Next, a resin insulated vacuum valve according to Example 2 of the present invention will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional view of the main part showing the configuration of the resin insulated vacuum valve according to the second embodiment of the present invention. The second embodiment differs from the first embodiment in that the curved portion is changed from a U-shaped cross section to a circular cross section. In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

図２に示すように、可動側電界緩和シールド１１の湾曲部１１ｃを、端部が筒部１１ｂと対向するまで曲折させ、断面円状としている。なお、湾曲部１１ｃを丸棒とし、筒部１１ｂに連接してもよい。   As shown in FIG. 2, the curved portion 11c of the movable-side electric field relaxation shield 11 is bent until the end portion faces the cylindrical portion 11b, and has a circular cross section. The curved portion 11c may be a round bar and connected to the tube portion 11b.

上記実施例２の樹脂絶縁真空バルブによれば、実施例１による効果のほかに、湾曲部１１ｃ近傍における絶縁層１４の内部応力の低減を図ることができる。   According to the resin insulated vacuum valve of the second embodiment, in addition to the effects of the first embodiment, the internal stress of the insulating layer 14 in the vicinity of the curved portion 11c can be reduced.

次に、本発明の実施例３に係る樹脂絶縁真空バルブを図３を参照して説明する。図３は、本発明の実施例３に係る樹脂絶縁真空バルブの構成を示す要部拡大断面図である。なお、この実施例３が実施例２と異なる点は、円板部に第２のリング板を設けたことである。図３において、実施例２と同様の構成部分においては、同一符号を付し、その詳細な説明を省略する。   Next, a resin insulated vacuum valve according to Example 3 of the present invention will be described with reference to FIG. FIG. 3 is an enlarged cross-sectional view of a main part showing the configuration of a resin insulated vacuum valve according to Example 3 of the present invention. The third embodiment is different from the second embodiment in that a second ring plate is provided in the disc portion. In FIG. 3, the same components as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

図３に示すように、可動側電界緩和シールド１１の円板部１１ａには、Ｏリング１３の外周に、環状の第２のリング板２１を同軸上に固定している。第２のリング板２１は、内径が可動側封着金具３の外径よりも僅かに大きく、高さが第１のリング板２０よりも高くなっている。第１のリング板２０と第２のリング板２１の間隔は、Ｏリング１３の圧縮を妨げるものではない。   As shown in FIG. 3, an annular second ring plate 21 is coaxially fixed on the outer periphery of the O-ring 13 in the disc portion 11 a of the movable-side electric field relaxation shield 11. The inner diameter of the second ring plate 21 is slightly larger than the outer diameter of the movable-side sealing metal fitting 3 and the height thereof is higher than that of the first ring plate 20. The distance between the first ring plate 20 and the second ring plate 21 does not hinder the compression of the O-ring 13.

上記実施例３の樹脂絶縁真空バルブによれば、実施例２による効果のほかに、第２のリング板２１に可動側封着金具３を嵌め込むことにより、より確実に可動側電界緩和シールド１１を同軸上に配置することができる。   According to the resin-insulated vacuum valve of the third embodiment, in addition to the effects of the second embodiment, the movable-side electric field relaxation shield 11 can be more reliably attached by fitting the movable-side sealing metal fitting 3 into the second ring plate 21. Can be arranged on the same axis.

以上述べたような実施形態によれば、固定側と可動側の電界緩和シールドを真空絶縁容器や封着金具の同軸上に配置することができるので、絶縁層の絶縁厚さと、湾曲部と真空絶縁容器との間隔を、全周にわたって均一化することができ、絶縁特性を向上させることができる。   According to the embodiment as described above, the electric field relaxation shields on the fixed side and the movable side can be arranged on the same axis of the vacuum insulating container or the sealing metal fitting. The space | interval with an insulation container can be equalized over a perimeter, and an insulation characteristic can be improved.

本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。   Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

１ 真空絶縁容器
２ 固定側封着金具
３ 可動側封着金具
１０ 固定側電界緩和シールド
１０ａ、１１ａ 円板部
１０ｂ、１１ｂ 筒部
１０ｃ、１１ｃ 湾曲部
１１ 可動側電界緩和シールド
１３ Ｏリング
１４ 絶縁層
２０ 第１のリング板
２１ 第２のリング板 DESCRIPTION OF SYMBOLS 1 Vacuum insulating container 2 Fixed side sealing metal fitting 3 Movable side sealing metal fitting 10 Fixed side electric field relaxation shield 10a, 11a Disc part 10b, 11b Cylindrical part 10c, 11c Bending part 11 Movable electric field relaxation shield 13 O-ring 14 Insulation layer 20 First ring plate 21 Second ring plate

Claims (5)

真空絶縁容器、接離自在の一対の接点、封着金具を有する真空バルブと、
前記封着金具を囲むように配置される半径方向に広がった円板部、前記円板部に連接され軸方向に伸びた筒部、前記筒部に連接され端部が曲折された湾曲部で構成される電界緩和シールドと、
前記円板部に固定されるとともに、前記封着金具に全周が当接する第１のリング板と、
前記第１のリング板の外周に設けられるとともに、前記円板部と前記封着金具とで全周が圧縮される弾性部材と、
前記真空バルブの外周に設けられた絶縁層と、
前記絶縁層の外周に設けられた接地層とを備え、
前記第１のリング板、前記弾性部材を少なくとも前記真空バルブの可動側に用いたことを特徴とする樹脂絶縁真空バルブ。 A vacuum insulating container, a pair of contactable and separable contacts, a vacuum valve having a sealing fitting,
A radially extending disk portion arranged so as to surround the sealing metal fitting, a cylindrical portion connected to the disk portion and extending in the axial direction, and a curved portion connected to the cylindrical portion and bent at the end portion. An electric field relaxation shield configured;
A first ring plate that is fixed to the disk portion and has an entire circumference in contact with the sealing fitting;
An elastic member that is provided on the outer periphery of the first ring plate, and whose entire periphery is compressed by the disk portion and the sealing fitting;
An insulating layer provided on the outer periphery of the vacuum valve;
A grounding layer provided on the outer periphery of the insulating layer,
A resin-insulated vacuum valve, wherein the first ring plate and the elastic member are used at least on the movable side of the vacuum valve. 前記湾曲部の端部を前記筒部と対向するまで曲折したことを特徴とする請求項１に記載の樹脂絶縁真空バルブ。   The resin-insulated vacuum valve according to claim 1, wherein an end portion of the curved portion is bent until it faces the cylindrical portion. 前記円板部に、内径が前記封着金具の外径よりも僅かに大きく、高さが前記第１のリング板よりも高い第２のリング板を設けたことを特徴とする請求項１または請求項２に記載の樹脂絶縁真空バルブ。   2. The second ring plate having an inner diameter slightly larger than an outer diameter of the sealing metal fitting and having a height higher than that of the first ring plate is provided on the disc portion. The resin insulation vacuum valve according to claim 2. 前記電界緩和リング、前記第１のリング板に、モールド樹脂の熱膨張率と同様な銅合金を用いたことを特徴とする請求項１乃至請求項３のいずれか１項に記載の樹脂絶縁真空バルブ。   The resin insulation vacuum according to any one of claims 1 to 3, wherein the electric field relaxation ring and the first ring plate are made of a copper alloy having a thermal expansion coefficient similar to that of a mold resin. valve. 前記弾性部材を中空としたことを特徴とする請求項１乃至請求項４のいずれか１項に記載の樹脂絶縁真空バルブ。   The resin-insulated vacuum valve according to any one of claims 1 to 4, wherein the elastic member is hollow.
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