JP6161354B2 - Vacuum valve - Google Patents

Vacuum valve Download PDF

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JP6161354B2
JP6161354B2 JP2013061261A JP2013061261A JP6161354B2 JP 6161354 B2 JP6161354 B2 JP 6161354B2 JP 2013061261 A JP2013061261 A JP 2013061261A JP 2013061261 A JP2013061261 A JP 2013061261A JP 6161354 B2 JP6161354 B2 JP 6161354B2
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shaped molded
molded body
bowl
insulating container
vacuum valve
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JP2014186879A (en
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糸谷 孝行
孝行 糸谷
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Mitsubishi Electric Corp
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Description

本発明は真空遮断器等に用いられる真空バルブに関するもので、特に汚損雰囲気や湿潤環境下での使用に適した真空バルブに関するものである。   The present invention relates to a vacuum valve used for a vacuum circuit breaker or the like, and more particularly to a vacuum valve suitable for use in a fouling atmosphere or a humid environment.

真空バルブは、一般にセラミックまたはガラスよりなる円筒状の絶縁容器の両端開口部を固定側端板及び可動側端板でそれぞれ密封した気密な真空容器を用い、固定側端板には固定電極を接合した棒状の固定側電極が支持固定され、前記固定電極と対向するように可動電極が接合された棒状の可動側電極が可動側端板に保持される。この可動側電極と可動側端板とは蛇腹状のベローズを介して気密に接続され、真空バルブ内の真空を維持しつつ可動側電極が固定側電極に対して接離動作される。また、電流遮断時に電極間で発生したアークにより、電極から飛散した金属蒸気が絶縁容器の内面に付着して内沿面の絶縁性能が低下するのを防止するため電極周囲にアークシールドが設けられる。通常、真空バルブの絶縁容器は円筒形状であり真空側より大気側の沿面絶縁性能が劣ることから、汚損や湿潤環境の影響を受けた場合、沿面絶縁性能低下を生じ、最悪は沿面閃絡事故に至る可能性がある。従って、このような環境下で使用される真空バルブは、絶縁容器の大気側の沿面長を長くして絶縁性能を向上させる必要があり、その一つの手段として絶縁容器の外形側にひだ形状を設ける方法がある(例えば特許文献1参照)。また、他の手段としては、絶縁容器外径側をエポキシ樹脂等で注型することでひだ形状を製作する方法や、絶縁容器外周部にリングを装着し撥水製の熱収縮チューブを被せる方法なども提案されている(例えば特許文献2参照)。   The vacuum valve uses a hermetic vacuum container in which both ends of a cylindrical insulating container made of ceramic or glass are sealed with a fixed end plate and a movable end plate, and a fixed electrode is joined to the fixed end plate. The rod-like fixed-side electrode is supported and fixed, and the rod-like movable-side electrode joined with the movable electrode so as to face the fixed electrode is held by the movable-side end plate. The movable side electrode and the movable side end plate are hermetically connected via a bellows-like bellows, and the movable side electrode is moved toward and away from the fixed side electrode while maintaining the vacuum in the vacuum valve. In addition, an arc shield is provided around the electrode to prevent the metal vapor scattered from the electrode from adhering to the inner surface of the insulating container due to the arc generated between the electrodes when the current is interrupted and the insulation performance on the inner surface being deteriorated. Normally, the insulation container of the vacuum valve is cylindrical and the creeping insulation performance on the atmosphere side is inferior to that on the vacuum side, so when affected by fouling or a wet environment, the creeping insulation performance deteriorates, the worst being a creeping flash accident May lead to Therefore, the vacuum valve used in such an environment needs to improve the insulation performance by increasing the creeping length on the atmosphere side of the insulating container, and as one means, a pleated shape is formed on the outer side of the insulating container. There is a method of providing (see, for example, Patent Document 1). In addition, as other means, a method of manufacturing a pleated shape by casting the outer diameter side of the insulating container with an epoxy resin or the like, or a method of attaching a ring to the outer periphery of the insulating container and covering the heat-shrinkable tube made of water repellent Have also been proposed (see, for example, Patent Document 2).

特開昭58−169726号公報(第2頁、第2図)JP 58-169726 (page 2, Fig. 2) 特公昭61−6963号公報(第1頁、第2図)Japanese Examined Patent Publication No. 61-6963 (first page, FIG. 2)

従来の技術による絶縁容器の大気側沿面長を長くする手段を用いた真空バルブは、絶縁容器自身にひだ形状を設ける場合は、絶縁容器の外径寸法が大きくなり、絶縁容器自身の価格上昇と、真空バルブ製作時に真空炉内に配置できる数量が減少することによる製作コスト上昇を招く課題がある。また、絶縁性の樹脂で真空バルブの大気側にひだ形状等を設ける場合は、注型するための金型が必要で、絶縁容器と樹脂の熱膨張係数の差を解消するための手段が必要になり、工期が長く、コスト上昇を招く課題がある。また、熱収縮チューブを被せる方法において、絶縁容器部に装着するリングの大きさは熱収縮チューブの収縮量によって制限されるため、大幅な沿面長増は望めないという課題があった。   The vacuum valve using the conventional means for increasing the creeping length on the atmosphere side of the insulation container has a large outer diameter when the insulation container itself is provided with a pleated shape, which increases the price of the insulation container itself. There is a problem in that the manufacturing cost is increased due to a decrease in the number of pieces that can be arranged in the vacuum furnace when the vacuum valve is manufactured. In addition, when a pleated shape is provided on the atmosphere side of the vacuum valve with insulating resin, a mold for casting is required, and means for eliminating the difference in thermal expansion coefficient between the insulating container and the resin is required. Therefore, there is a problem that the construction period is long and the cost is increased. In addition, in the method of covering the heat-shrinkable tube, the size of the ring attached to the insulating container portion is limited by the amount of shrinkage of the heat-shrinkable tube, so that there is a problem that a significant increase in creepage cannot be expected.

この発明は、上記のような問題点を解決するためになされたもので、絶縁容器の全長及び外径寸法を大きくすることなく真空バルブ大気側の沿面長の増大が可能で、コストの増大を抑えつつ汚損の発生や湿潤の多い環境下での使用に適した真空バルブを提供することを目的としている。   The present invention has been made to solve the above-described problems, and it is possible to increase the creeping length of the vacuum valve atmosphere side without increasing the overall length and outer diameter of the insulating container, thereby increasing the cost. An object of the present invention is to provide a vacuum valve that is suitable for use in an environment where generation of fouling and humidity is high while suppressing it.

本発明に係る真空バルブは、円筒状の絶縁容器の両端部が封着部材で密封された真空容器と、この真空容器内に対向配置された接離可能な一対の電極と、沿面距離を増大させるための周方向に延在する複数個からなる互いに離間された襞状の突出部を有する円筒状に一体として形成される絶縁性ゴム材からなる襞状成形体を備え、前記襞状成形体は単一の円筒状体として前記絶縁容器の外周面のみへ前記電極の切離空間を囲んで装着されるものであって、前記襞状成形体はそれ自体のゴム弾性を利用して円筒状をなす前記絶縁容器の外周面に密着されているものであり、前記襞状成形体と前記絶縁容器との界面における電気的絶縁力を前記襞状成形体の大気側沿面の電気的絶縁力よりも大きくしたことを特徴とするものである。
A vacuum valve according to the present invention increases a creeping distance by a vacuum container in which both ends of a cylindrical insulating container are sealed with a sealing member, a pair of electrodes that are arranged in contact with each other and disposed opposite to each other in the vacuum container. A flange-shaped molded body made of an insulating rubber material integrally formed in a cylindrical shape having a plurality of spaced-apart flange-shaped protrusions extending in the circumferential direction. Is attached to only the outer peripheral surface of the insulating container as a single cylindrical body so as to surround the separation space of the electrode, and the bowl-shaped molded body has a cylindrical shape utilizing its own rubber elasticity. Is formed in close contact with the outer peripheral surface of the insulating container, and the electrical insulation strength at the interface between the bowl-shaped molded body and the insulating container is greater than the electrical insulation strength on the airside surface of the bowl-shaped molded body. Is also characterized by a larger size.

この発明においては、沿面距離を増大させるための周方向に延在する複数個からなる互いに離間された襞状の突出部を有する円筒状に一体として形成される絶縁性ゴム材からなる襞状成形体を、単一の筒状体として前記絶縁容器の外周面のみへ前記電極の切離空間を囲んで装着されるものであって、前記襞状成形体はそれ自体のゴム弾性を利用して円筒状をなす前記絶縁容器の外周面に密着されているものであり、前記襞状成形体を前記絶縁容器の外周面へ確実に密着させることができ、前記襞状成形体と前記絶縁容器との界面における電気的絶縁力を前記襞状成形体の大気側沿面の電気的絶縁力よりも大きくしたことにより、円筒状をなす絶縁容器の全長及び外径寸法を大きくすることなく真空バルブの大気側の沿面長の増大が可能となり、汚損の発生や湿潤の多い環境下での使用に適した真空バルブが得られる。また、絶縁容器及び襞状成形体の共用化を図ることも可能となり、コストの低減も図れる。

In the present invention, a cage-shaped molding made of an insulating rubber material integrally formed in a cylindrical shape having a plurality of spaced-apart collar-shaped protrusions extending in the circumferential direction for increasing the creepage distance. The body is mounted as a single cylindrical body only on the outer peripheral surface of the insulating container, surrounding the separation space of the electrode, and the bowl-shaped molded body utilizes its own rubber elasticity. It is closely attached to the outer peripheral surface of the insulating container having a cylindrical shape , and the hook-shaped molded body can be securely adhered to the outer peripheral surface of the insulating container, and the hook-shaped molded body, the insulating container, By making the electrical insulation strength at the interface of the cylinder- shaped molded body larger than the electrical insulation strength on the airside surface of the bowl-shaped molded body, the vacuum valve atmosphere is not increased without increasing the overall length and outer diameter of the cylindrical insulating container. The creepage length on the side can be increased Vacuum valve suitable for use in high environment occurrence or wet soiling is obtained. In addition, the insulating container and the bowl-shaped molded body can be shared, and the cost can be reduced.

本発明の実施の形態1に係わる真空バルブの要部構成を示す断面図である。It is sectional drawing which shows the principal part structure of the vacuum valve concerning Embodiment 1 of this invention. 図1に示された襞状成形体を示す断面図である。It is sectional drawing which shows the bowl-shaped molded object shown by FIG. 本発明の実施の形態2に係わる真空バルブの要部構成を示す断面図である。It is sectional drawing which shows the principal part structure of the vacuum valve concerning Embodiment 2 of this invention. 図3に示された襞状成形体を示す断面図及び斜視図である。It is sectional drawing and a perspective view which show the bowl-shaped molded object shown by FIG. 図3に示された実施の形態2の変形例の要部構成を示す断面図である。It is sectional drawing which shows the principal part structure of the modification of Embodiment 2 shown by FIG. 図5に示された変形例の襞状成形体を示す断面図及び斜視図である。It is sectional drawing and a perspective view which show the bowl-shaped molded object of the modification shown by FIG. 本発明の実施の形態3に係わる真空バルブの要部構成を示す断面図である。It is sectional drawing which shows the principal part structure of the vacuum valve concerning Embodiment 3 of this invention. 図7に示された襞状成形体を示す断面図及び斜視図である。It is sectional drawing and a perspective view which show the bowl-shaped molded object shown by FIG.

実施の形態1.
図1はこの実施の形態1の真空バルブの要部構成を概略的に示す断面図、図2は図1に示された襞状成形体を示す断面図である。図において、真空バルブはガラスあるいはアルミナセラミックス等からなる円筒状の絶縁容器1、この絶縁容器1の一方の開口端部にろう付けにより封着された封着部材2、絶縁容器1の他方の開口端部にろう付けにより封着された封着部材3からなる真空容器10と、封着部材2の中心部に貫通されてその封着部材2の貫通部分に気密にろう付け接合され、絶縁容器1の内部側の先端に固定電極4aを有する棒状の固定側電極4と、封着部材3に対して気密を保持しつつ軸方向(図の上下方向)に移動可能に貫通・保持され、絶縁容器1の内部側の先端に固定電極4aに対向する可動電極5aを有し、固定側電極4に対して接離可能に配設された棒状の可動側電極5を備えている。
Embodiment 1 FIG.
FIG. 1 is a cross-sectional view schematically showing a main part configuration of the vacuum valve according to the first embodiment, and FIG. 2 is a cross-sectional view showing the bowl-shaped formed body shown in FIG. In the figure, a vacuum valve is a cylindrical insulating container 1 made of glass or alumina ceramics, a sealing member 2 sealed by brazing at one opening end of the insulating container 1, and the other opening of the insulating container 1. A vacuum vessel 10 composed of a sealing member 3 sealed by brazing at an end, and an airtight brazed joint to the through portion of the sealing member 2 through the central portion of the sealing member 2, and an insulating container The rod-like fixed side electrode 4 having a fixed electrode 4a at the tip of the inner side of 1 and the sealing member 3 are hermetically sealed and penetrated and held so as to be movable in the axial direction (vertical direction in the figure). A movable electrode 5 a facing the fixed electrode 4 a is provided at the tip on the inner side of the container 1, and a rod-shaped movable side electrode 5 disposed so as to be able to contact with and separate from the fixed side electrode 4 is provided.

可動側電極5は封着部材3に対して、例えば薄いステンレス材などで蛇腹状に製作されたベローズ6を介して気密に保持されており、可動側電極5が真空気密を保ちながら軸方向に移動可能なように構成されている。また、絶縁容器1の内部には固定電極4aと可動電極5aの切離空間のまわりを包囲するように形成された円筒状のアークシールド7が設けられており、電流遮断時に電極間で発生するアークによる金属蒸気が絶縁容器1の内面に付着する量を抑制するように構成されている。また、ベローズカバー8は可動電極5aとベローズ6の間に配設され、可動側電極5に固定されており、電流遮断時に電極間で発生するアークによる金属蒸気のベローズ6への付着を抑制している。   The movable side electrode 5 is held airtight with respect to the sealing member 3 via a bellows 6 made of, for example, a thin stainless steel material in a bellows shape, and the movable side electrode 5 is kept in the axial direction while maintaining vacuum airtightness. It is configured to be movable. In addition, a cylindrical arc shield 7 formed so as to surround the separation space between the fixed electrode 4a and the movable electrode 5a is provided inside the insulating container 1, and is generated between the electrodes when the current is interrupted. The amount of the metal vapor caused by the arc adhering to the inner surface of the insulating container 1 is suppressed. The bellows cover 8 is disposed between the movable electrode 5a and the bellows 6 and is fixed to the movable electrode 5. The bellows cover 8 suppresses adhesion of metal vapor to the bellows 6 due to an arc generated between the electrodes when the current is interrupted. ing.

絶縁容器1の外周面1aには、この発明の典型的な特徴部分の一つであるシリコン系ゴム等の絶縁性ゴム材の成形品からなり、周方向に襞状に延在する複数の突出部9aを有する筒状体からなる襞状成形体9が設けられている。襞状成形体9の内周面9bは絶縁容器1の外周面1aに沿うような形状となっている。襞状成形体9の突出部9aは沿面長を増大させるもので、この例では1つの成形体に複数設けることで必要な沿面長が得られる形状としている。襞状成形体9の内径寸法は、絶縁容器1の外形寸法より若干小さく形成されており、襞状成形体9を絶縁容器1の所定の場所に装着した後は襞状成形体9自体がゴム弾性により収縮する圧力が常時働き、両者が密着するような関係にしている。その際に、両者をより密着させるため、接着剤(図示省略)により接着するか、例えばシリコングリースなどのグリース(図示省略)を予め塗布しておき密着性を向上させる方法などを行うことができる。   The outer peripheral surface 1a of the insulating container 1 is made of a molded product of an insulating rubber material such as silicon rubber, which is one of the typical features of the present invention, and has a plurality of protrusions extending in the shape of a bowl in the circumferential direction. A bowl-shaped molded body 9 made of a cylindrical body having a portion 9a is provided. The inner peripheral surface 9 b of the bowl-shaped molded body 9 has a shape along the outer peripheral surface 1 a of the insulating container 1. The protrusions 9a of the bowl-shaped molded body 9 increase the creeping length. In this example, a plurality of protrusions 9a are provided on a single molded body to obtain a necessary creeping length. The inner diameter dimension of the bowl-shaped molded body 9 is slightly smaller than the outer dimension of the insulating container 1, and after the bowl-shaped molded body 9 is mounted on a predetermined place of the insulating container 1, the bowl-shaped molded body 9 itself is a rubber. The pressure that contracts due to elasticity always works, and the two are in close contact with each other. At that time, in order to make them more closely contact each other, an adhesive (not shown) can be bonded, or a grease (not shown) such as silicon grease can be applied in advance to improve the adhesion. .

襞状成形体9として好ましく用いることができる材料としては、長期信頼性(耐劣化)の点からシリコン系樹脂またはフッ素系樹脂のゴム材が良く、さらに外面を形成する襞状の突出部9aは撥水性を有している方が良い。また、絶縁容器1の外周面1aは襞状成形体9との密着性を図るためにできるだけ平滑である方が良く、絶縁容器1は表面が平滑なガラス製の円筒として製作する、またはアルミナ等のセラミック円筒の外側面にガラス質の釉薬を焼付けて表面を平滑にするように製作することが望ましい。   As a material that can be preferably used as the bowl-shaped molded body 9, a rubber material of silicon resin or fluorine-based resin is good from the viewpoint of long-term reliability (deterioration resistance), and the bowl-shaped protrusion 9a that forms the outer surface is It is better to have water repellency. Further, the outer peripheral surface 1a of the insulating container 1 is preferably as smooth as possible in order to achieve adhesion with the bowl-shaped molded body 9, and the insulating container 1 is manufactured as a glass cylinder having a smooth surface, or alumina or the like. It is desirable to fabricate the ceramic cylinder with a glassy glaze on the outer surface to smooth the surface.

上記のように構成された実施の形態1においては、絶縁容器1の外周面に装着された襞状成形体9がそれ自体のゴム弾性を利用して絶縁容器1の外周面に密着されていることで、絶縁容器1と襞状成形体9との界面の電気的絶縁特性(「電気的絶縁力」)は、突出部9aが軸方向に複数設けられている襞状成形体9の外周面における大気中で清浄な表面状態での絶縁力よりも大きくなる。そして、絶縁容器1の襞状成形体9を装着した沿面部分1bの長さよりも、突出部9aを有する襞状成形体9の大気側の表面部における沿面の長さの方が、突出されていることで、相当寸法長くなるため、襞状成形体9を装着した後の真空バルブの大気側絶縁部沿面距離は襞状成形体9の装着前よりも長くなり、大気側絶縁性能が向上する。そのため、真空バルブの耐久性が向上し、長寿命化が図れる。   In the first embodiment configured as described above, the bowl-shaped molded body 9 attached to the outer peripheral surface of the insulating container 1 is in close contact with the outer peripheral surface of the insulating container 1 using its own rubber elasticity. Thus, the electrical insulation characteristic ("electrical insulation strength") at the interface between the insulating container 1 and the bowl-shaped molded body 9 is the outer peripheral surface of the bowl-shaped molded body 9 in which a plurality of protrusions 9a are provided in the axial direction. It is larger than the insulation strength in a clean surface state in the atmosphere. And, the length of the creeping surface in the surface portion on the atmosphere side of the bowl-shaped molded body 9 having the protruding portion 9a is projected rather than the length of the creeping surface portion 1b on which the bowl-shaped molded body 9 of the insulating container 1 is mounted. Therefore, the creeping distance of the atmosphere-side insulating portion of the vacuum valve after mounting the bowl-shaped molded body 9 is longer than that before mounting the bowl-shaped molded body 9, and the atmosphere-side insulation performance is improved. . Therefore, the durability of the vacuum valve is improved, and the life can be extended.

また、絶縁容器1を大形化するような変更の必要がないので、絶縁容器1を安価に入手できる。さらに真空バルブ製造工程内でのろう付け組立工程は炉中でろう付けを行うため、真空バルブの外形寸法が炉内に配置できる数を決め、製造コストに影響を及ぼすので、結果的には製造コストの低減や環境負荷の低減効果がある。また、襞状成形体9を界面絶縁で真空バルブの絶縁容器1に装着することにより、絶縁容器1の全長及び外径寸法を大きくすることなく真空バルブ大気側の沿面長増が可能で、絶縁容器を安価に製作できる上、真空バルブの製作コスト低減も図れるため、汚損及び湿潤の多い環境下での使用に適した真空バルブを経済的に提供することができる。   Further, since there is no need to change the size of the insulating container 1, the insulating container 1 can be obtained at a low cost. Furthermore, since the brazing assembly process in the vacuum valve manufacturing process brazes in the furnace, the external dimensions of the vacuum valve determine the number that can be placed in the furnace and affect the manufacturing cost. Cost reduction and environmental impact reduction effect. Further, by mounting the bowl-shaped molded body 9 on the insulating container 1 of the vacuum valve by interfacial insulation, it is possible to increase the creeping length on the atmosphere side of the vacuum valve without increasing the overall length and outer diameter of the insulating container 1, Since the container can be manufactured at a low cost and the manufacturing cost of the vacuum valve can be reduced, it is possible to economically provide a vacuum valve suitable for use in an environment with much contamination and moisture.

実施の形態2.
図3は本発明の実施の形態2に係わる真空バルブの要部構成を概略的に示す断面図、図4は図3に示された襞状成形体を示す図であり、(a)は断面図、(b)は斜視図である。また、図5は図3に示された実施の形態2の変形例の要部構成を概略的に示す断面図、図6は図5に示された変形例の襞状成形体を示す図であり、(a)は断面図、(b)は斜視図である。なお、この実施の形態2の真空バルブの襞状成形体を除く基本的な構成部分は、前述の実施の形態1と同様であり、襞状成形体及びその装着部分を中心に説明する。なお、同一または相当部分には同一符号を付し、重複する説明を省略する。
Embodiment 2. FIG.
FIG. 3 is a cross-sectional view schematically showing a main part configuration of the vacuum valve according to the second embodiment of the present invention, FIG. 4 is a view showing the bowl-shaped molded body shown in FIG. 3, and (a) is a cross-sectional view. FIG. 4B is a perspective view. FIG. 5 is a cross-sectional view schematically showing a main configuration of a modification of the second embodiment shown in FIG. 3, and FIG. 6 is a view showing a bowl-shaped molded body of the modification shown in FIG. (A) is a sectional view and (b) is a perspective view. The basic components other than the saddle-shaped molded body of the vacuum valve according to the second embodiment are the same as those of the first embodiment described above, and the explanation will focus on the saddle-shaped molded body and its mounting portion. In addition, the same code | symbol is attached | subjected to the same or an equivalent part, and the overlapping description is abbreviate | omitted.

実施の形態2における襞状成形体9Aは、図2に示す複数の襞状の突出部9aの内、1つの突出部9aを独立して成形したリング状体からなる。襞状成形体9Aの素材は実施の形態1と同様、シリコン系ゴム等の絶縁性ゴム材からなる。真空バルブは、複数の襞状成形体9Aを軸方向に所定間隔で互いに離間させて絶縁容器1の外周面に装着している。襞状成形体9Aの装着個数は、必要な沿面長に対して適宜決められる。また、装着する場所や間隔は、絶縁容器1上であれば問題ないが、等間隔に配置したほうが良い。   The bowl-shaped molded body 9A in the second embodiment is a ring-shaped body obtained by independently molding one of the plurality of bowl-shaped protrusions 9a shown in FIG. The material of the bowl-shaped molded body 9A is made of an insulating rubber material such as silicon rubber as in the first embodiment. The vacuum valve is mounted on the outer peripheral surface of the insulating container 1 with a plurality of bowl-shaped molded bodies 9A spaced apart from each other at predetermined intervals in the axial direction. The number of the hook-shaped molded bodies 9A attached is determined as appropriate for the required creepage length. Further, there is no problem as long as the mounting location and interval are on the insulating container 1, but it is better to arrange them at regular intervals.

襞状成形体9Aの内径寸法は、絶縁容器1の外形寸法より若干小さくしており、襞状成形体9Aを絶縁容器1の所定の場所に装着した後は襞状成形体9Aがゴム弾性によって収縮する圧力が常時働き、両者が密着するような関係にしている。その際に、両者をより密着させるため、接着剤により接着するか、グリースを予め塗布しておき密着性を向上させることが好ましい。襞状成形体9Aの材料は、長期信頼性(耐劣化)の点からシリコン系またはフッ素系のゴム材が良く、さらに突出部9aの外側部分は撥水性を有している方が良い。なお、図4の襞状成形体9Aは図の上下方向に対称な形状であり装着方向に規定はない。   The inner diameter dimension of the bowl-shaped molded body 9A is slightly smaller than the outer dimension of the insulating container 1, and after the bowl-shaped molded body 9A is attached to a predetermined place of the insulating container 1, the bowl-shaped molded body 9A is elastically elastic. The shrinking pressure always works and the two are in close contact with each other. At that time, in order to make them more closely contact, it is preferable to bond them with an adhesive or to apply grease in advance to improve the adhesion. The material of the bowl-shaped molded body 9A is preferably a silicon-based or fluorine-based rubber material from the viewpoint of long-term reliability (deterioration resistance), and the outer portion of the protruding portion 9a is preferably water-repellent. Note that the bowl-shaped molded body 9A in FIG. 4 has a symmetrical shape in the vertical direction in the figure, and is not specified in the mounting direction.

一方、図5に示す実施の形態2の変形例の場合、襞状成形体9Bは図の上下方向に非対称形状に形成されている。真空バルブの取り付け方向が、図5のように固定側電極4が上である場合は、図5に示すように、突出部9aの半径方向の傾斜が下方向になるように各襞状成形体9Bの向きを揃えて装着する必要があり、この装着方向に揃えることで、襞状成形体9Bに付着した水分がより流れ落ちやすくなる。なお、絶縁容器1に装着する襞状成形体の形状は、特定の1種類に統一する必要はなく、例えば図4の襞状成形体9Aと図6の襞状成形体9Bを混在させるなど、1つの絶縁容器1に複数種類の襞状成形体を装着しても良い。   On the other hand, in the modification of the second embodiment shown in FIG. 5, the bowl-shaped molded body 9B is formed in an asymmetric shape in the vertical direction of the figure. When the mounting direction of the vacuum valve is the fixed side electrode 4 as shown in FIG. 5, as shown in FIG. 5, each bowl-shaped molded body is set so that the radial inclination of the protruding portion 9a is downward. It is necessary to mount 9B in the same direction. By aligning in this mounting direction, moisture attached to the bowl-shaped molded body 9B is more likely to flow down. In addition, the shape of the bowl-shaped molded body to be attached to the insulating container 1 does not need to be unified into one specific type. For example, the bowl-shaped molded body 9A of FIG. 4 and the bowl-shaped molded body 9B of FIG. A plurality of types of bowl-shaped molded bodies may be mounted on one insulating container 1.

上記のように構成された実施の形態2においては、絶縁容器1に1個の襞状成形体9Aまたは襞状成形体9Bを装着した状態で、絶縁容器1と襞状成形体9A(9B)との界面の電気的絶縁力は、襞状成形体9A(9B)の突出部9aの大気中で清浄な表面状態での絶縁力より大きくなる。襞状成形体9A(9B)を装着した絶縁容器1の沿面部分1bの長さより、襞状成形体9A(9B)の突出部9aによる大気側沿面の長さの方がかなり長くなるため、襞状成形体9A(9B)装着後の真空バルブの大気側絶縁部沿面距離は襞状成形体9A(9B)装着前よりも長くなり、大気側絶縁性能が向上する。   In the second embodiment configured as described above, the insulating container 1 and the bowl-shaped molded body 9A (9B) in a state where one bowl-shaped molded body 9A or the bowl-shaped molded body 9B is mounted on the insulating container 1. The electrical insulation strength at the interface between the projections 9A and 9B is larger than the insulation strength in the clean surface state of the protrusion 9a of the bowl-shaped molded body 9A (9B). Since the length of the creeping portion 9a of the bowl-shaped molded body 9A (9B) is considerably longer than the length of the creeping portion 1b of the insulating container 1 equipped with the bowl-shaped molded body 9A (9B), The creeping distance of the air-side insulating portion of the vacuum valve after mounting the shaped molded body 9A (9B) is longer than that before mounting the bowl-shaped molded body 9A (9B), and the air-side insulating performance is improved.

そのため、襞状成形体9A(9B)を所要個数装着することで、必要な沿面長が得られる。また、絶縁容器1を大形化するような変更が必要なく、絶縁容器1を安価に入手でき、さらに真空バルブ製造工程内でのろう付け組立工程は炉中でろう付けを行うため、真空バルブの外形寸法が炉内に配置できる数を決め、製造コストに影響を及ぼすので、結果的には製造コスト低減効果がある。   Therefore, a necessary creepage length can be obtained by attaching a required number of bowl-shaped molded bodies 9A (9B). Further, since there is no need to change the size of the insulating container 1, the insulating container 1 can be obtained at a low cost, and the brazing assembly process in the vacuum valve manufacturing process is brazed in a furnace. Since the number of external dimensions determines the number that can be arranged in the furnace and affects the manufacturing cost, there is an effect of reducing the manufacturing cost as a result.

上記のように実施の形態2によれば、1つの突出部9aを設けたリング状体からなる襞状成形体9A(9B)を絶縁容器1に複数個装着して真空バルブを構成することにより、絶縁容器1の全長及び外径寸法を大きくすることなく真空バルブ大気側の沿面長増が可能で、絶縁容器及び襞状成形体の共用化が図れる利点もあり、絶縁容器を安価に製作できる上、真空バルブの製作コスト低減も図れるため、汚損及び湿潤の多い環境下での使用に適した真空バルブを経済的に提供することができる。   As described above, according to the second embodiment, the vacuum valve is configured by mounting a plurality of bowl-shaped molded bodies 9A (9B) made of a ring-shaped body provided with one protrusion 9a on the insulating container 1. Further, it is possible to increase the creeping length on the atmosphere side of the vacuum valve without increasing the overall length and outer diameter of the insulating container 1, and there is an advantage that the insulating container and the bowl-shaped molded body can be shared, and the insulating container can be manufactured at low cost. In addition, since the manufacturing cost of the vacuum valve can be reduced, it is possible to economically provide a vacuum valve suitable for use in an environment with much contamination and moisture.

実施の形態3.
図7は本発明の実施の形態3に係わる真空バルブの要部構成を示す断面図、図8は図7に示された襞状成形体を示す図であり、(a)は断面図、(b)は斜視図である。なお、この実施の形態3の真空バルブの真空容器と襞状成形体を除く基本的な構成部分は、前述の実施の形態1と同様であり、真空容器と襞状成形体及びその装着部分を中心に説明する。図において、絶縁容器1Aの外周面1aには界面絶縁部とする周方向に凹設された滑らかな曲面の窪み部1cが、絶縁容器1の中心軸と平行な方向に所定間隔で複数個所に設けられている。窪み部1cの形状は特に限定されるものではないが、後述するリング状体からなる襞状成形体9Cを装着した際に隙間なく密着できる形状とする必要があり、角などの無い滑らかな曲面形状が良い。
Embodiment 3 FIG.
7 is a cross-sectional view showing the configuration of the main part of the vacuum valve according to Embodiment 3 of the present invention, FIG. 8 is a view showing the bowl-shaped molded body shown in FIG. 7, (a) is a cross-sectional view, b) is a perspective view. The basic components of the vacuum valve according to the third embodiment excluding the vacuum container and the bowl-shaped molded body are the same as those of the first embodiment, and the vacuum container, the bowl-shaped molded body, and its mounting portion are the same. The explanation is centered. In the figure, smooth curved dents 1c, which are recessed in the circumferential direction as interfacial insulating parts, are provided at a plurality of locations at predetermined intervals in a direction parallel to the central axis of the insulating container 1 on the outer peripheral surface 1a of the insulating container 1A. Is provided. The shape of the indented portion 1c is not particularly limited, but it is necessary to have a shape that can be closely contacted when a flange-shaped molded body 9C made of a ring-shaped body, which will be described later, is mounted. Good shape.

襞状成形体9Cはリング形状かつ絶縁容器1の窪み部1cの形状に沿って密着できるように、内周面9cが窪み部1cの形状に対応するように中心方向に突出した曲面からなり、実施の形態1、2と同様のシリコン系ゴム等の絶縁性ゴム材を成形で製作した部品である。装着する襞状成形体9Cの個数は、必要な沿面長に対して適宜決められる。襞状成形体9Cを絶縁容器1の窪み部1cに装着した後は、襞状成形体9C自体がゴム弾性によって収縮する圧力が常時働き、両者が密着するような関係にしている。なお、密着力を高めるため、実施の形態1、2と同様に接着剤、またはグリースを用いることも望ましい。また、襞状成形体9Cの材料は、長期信頼性(耐劣化)の点からシリコン系樹脂またはフッ素系樹脂のゴム材が良く、さらに突出部9aの表面は撥水性を有している方が良い。   The bowl-shaped molded body 9C has a curved surface protruding in the center direction so that the inner peripheral surface 9c corresponds to the shape of the recessed portion 1c so that it can be closely attached along the shape of the recessed portion 1c of the insulating container 1 in the ring shape. This is a part produced by molding an insulating rubber material such as silicon rubber similar to the first and second embodiments. The number of hook-shaped molded bodies 9C to be mounted is determined as appropriate for the required creepage length. After the hook-shaped molded body 9C is mounted in the recess 1c of the insulating container 1, the pressure that causes the hook-shaped molded body 9C itself to shrink due to rubber elasticity always works, and the two are in close contact with each other. In order to enhance the adhesion, it is also desirable to use an adhesive or grease as in the first and second embodiments. In addition, the material of the bowl-shaped molded body 9C is preferably a rubber material of silicon-based resin or fluorine-based resin from the viewpoint of long-term reliability (deterioration resistance), and the surface of the protruding portion 9a should have water repellency. good.

上記のように構成された実施の形態3においては、絶縁容器1の窪み部1cにおける界面絶縁部分の襞状成形体9Cとの沿面距離は窪みを形成していることで直線の場合よりも長くなるため、界面絶縁力もより大きくなり、襞状成形体9Cの突出部9aにおける大気絶縁部沿面の距離をより長くした形状にすることができる。絶縁容器1の界面絶縁部となる窪み部1cに1個の襞状成形体9Cを装着した状態で、絶縁容器1と襞状成形体9Cとの界面の「電気的絶縁力」は、襞状成形体9Cの外側部である突出部9aの大気中で清浄な表面状態での絶縁力より大きくなる。襞状成形体9Cを装着した絶縁容器1の界面絶縁部となる窪み部1cの沿面部分の長さより、襞状成形体9Cの大気側沿面の長さの方がかなり長くなるため、襞状成形体9C装着後の真空バルブの大気側絶縁部沿面距離は襞状成形体9C装着前よりも長くなり、大気側絶縁性能が向上する。   In the third embodiment configured as described above, the creepage distance between the ridge-shaped molded body 9C of the interfacial insulating portion in the dent 1c of the insulating container 1 is longer than that of a straight line by forming the dent. Therefore, the interfacial insulating force is also increased, and the distance along the air insulating portion along the protruding portion 9a of the bowl-shaped molded body 9C can be made longer. In a state in which one bowl-shaped molded body 9C is mounted in the recess 1c serving as the interface insulating section of the insulating container 1, the “electrical insulation strength” at the interface between the insulating container 1 and the bowl-shaped molded body 9C is a bowl-shaped It becomes larger than the insulation strength in a clean surface state in the atmosphere of the protruding portion 9a which is the outer portion of the molded body 9C. Since the length of the creeping portion 9C on the atmosphere side is considerably longer than the length of the creeping portion of the recess 1c, which becomes the interface insulating portion of the insulating container 1 equipped with the saddle-shaped molded body 9C, the saddle-shaped molding The creeping distance on the atmosphere side insulating portion of the vacuum valve after the body 9C is mounted is longer than that before the bowl-shaped molded body 9C is mounted, and the atmosphere side insulation performance is improved.

上記の実施の形態3によれば、襞状成形体9Cを所要個数装着することで必要な沿面長が得られる。また、絶縁容器1に界面絶縁部となる窪み部1cを設けることで、襞状成形体9Cを装着する場所が明確になり、装着の作業性が向上する上、絶縁容器1に対する据わりがよく、襞状成形体9Cを絶縁容器1外周面に確実に保持させることができる。また、絶縁容器1を大形化するような変更が必要なく、絶縁容器1を安価に入手でき、さらに真空バルブ製造工程内でのろう付け組立工程は炉中でろう付けを行うため、真空バルブの外形寸法が炉内に配置できる数を決め、製造コストに影響を及ぼすので、結果的には製造コスト低減効果がある。   According to the above-described third embodiment, a necessary creepage length can be obtained by mounting a required number of hook-shaped molded bodies 9C. Further, by providing the insulating container 1 with the recess 1c serving as the interface insulating part, the place where the bowl-shaped molded body 9C is mounted is clarified, the workability of the mounting is improved, and the installation with respect to the insulating container 1 is good. The bowl-shaped molded body 9C can be reliably held on the outer peripheral surface of the insulating container 1. Further, since there is no need to change the size of the insulating container 1, the insulating container 1 can be obtained at a low cost, and the brazing assembly process in the vacuum valve manufacturing process is brazed in a furnace. Since the number of external dimensions determines the number that can be arranged in the furnace and affects the manufacturing cost, there is an effect of reducing the manufacturing cost as a result.

また、リング状体からなる襞状成形体9Cを界面絶縁で真空バルブの絶縁容器1に複数個装着することにより、絶縁容器1の全長及び外径寸法を大きくすることなく真空バルブ大気側の沿面長増が可能で、絶縁容器及び襞状成形体の共用化が図れる利点もあり、絶縁容器を安価に製作できる上、真空バルブの製作コスト低減も図れるため、汚損及び湿潤の多い環境下での使用に適した真空バルブを経済的に提供することができる。   Further, by mounting a plurality of ring-shaped molded bodies 9C made of ring-shaped bodies on the insulating container 1 of the vacuum valve by interfacial insulation, the creeping surface on the atmosphere side of the vacuum valve without increasing the overall length and outer diameter of the insulating container 1 There is an advantage that the insulation container and the bowl-shaped molded body can be shared, and the insulation container can be manufactured at a low cost and the manufacturing cost of the vacuum valve can be reduced. A vacuum valve suitable for use can be economically provided.

なお、本発明は、その発明の範囲内において適宜、変形、あるいは省略することが可能である。例えば、図1の筒状体からなる襞状成形体9を軸方向に複数に分割し、あるいは絶縁容器1の外周面に窪み部1cを設けて襞状成形体9を装着しても差し支えない。また、リング状体からなる襞状成形体9B、9Cは、突出部9aを複数にしても良い。その他、種々の変形や変更が可能であることは言うまでもない。   The present invention can be appropriately modified or omitted within the scope of the invention. For example, the hook-shaped molded body 9 formed of the cylindrical body of FIG. 1 may be divided into a plurality of parts in the axial direction, or the hollow-shaped molded body 9 may be mounted by providing the recessed portion 1 c on the outer peripheral surface of the insulating container 1. . Moreover, the collar-shaped molded bodies 9B and 9C made of a ring-shaped body may have a plurality of protruding portions 9a. Needless to say, various modifications and changes can be made.

1、1A 絶縁容器、 1a 外周面、 1b 沿面部分、 1c 窪み部、 2 封着部材、 3 封着部材、 4 固定側電極、 4a 固定電極、 5 可動側電極、 5a 可動電極、 6 ベローズ、 7 アークシールド、 8 ベローズカバー、 9、9A、9B、9C 襞状成形体、 9a 突出部、 9b 内周面、 9c 内周面、 10 真空容器。   DESCRIPTION OF SYMBOLS 1, 1A insulation container, 1a outer peripheral surface, 1b Creeping part, 1c hollow part, 2 sealing member, 3 sealing member, 4 fixed side electrode, 4a fixed electrode, 5 movable side electrode, 5a movable electrode, 6 bellows, 7 Arc shield, 8 bellows cover, 9, 9A, 9B, 9C bowl-shaped body, 9a protrusion, 9b inner peripheral surface, 9c inner peripheral surface, 10 vacuum vessel.

Claims (4)

円筒状の絶縁容器の両端部が封着部材で密封された真空容器と、この真空容器内に対向配置された接離可能な一対の電極と、沿面距離を増大させるための周方向に延在する複数個からなる互いに離間された襞状の突出部を有する円筒状に一体として形成される絶縁性ゴム材からなる襞状成形体を備え、前記襞状成形体は単一の円筒状体として前記絶縁容器の外周面のみへ前記電極の切離空間を囲んで装着されるものであって、前記襞状成形体はそれ自体のゴム弾性を利用して円筒状をなす前記絶縁容器の外周面に密着されているものであり、前記襞状成形体と前記絶縁容器との界面における電気的絶縁力を前記襞状成形体の大気側沿面の電気的絶縁力よりも大きくしたことを特徴とする真空バルブ。 A vacuum container in which both ends of a cylindrical insulating container are sealed with a sealing member, a pair of electrodes that can be contacted and separated disposed in the vacuum container, and a circumferential direction for increasing a creeping distance A plurality of ridge-shaped molded bodies made of an insulating rubber material integrally formed in a cylindrical shape having ridge-shaped protrusions spaced apart from each other, wherein the ridge-shaped molded body is a single cylindrical body The insulating container is attached to only the outer peripheral surface of the insulating container so as to surround the separation space of the electrode, and the flange-shaped molded body has a cylindrical shape using its own rubber elasticity. The electrical insulation strength at the interface between the bowl-shaped molded body and the insulating container is made larger than the electrical insulation strength on the airside surface of the bowl-shaped molded body. Vacuum valve. 前記襞状成形体と前記絶縁容器との界面に、接着材またはグリースが介在されていることを特徴とする請求項1に記載の真空バルブ。   The vacuum valve according to claim 1, wherein an adhesive or grease is interposed at an interface between the bowl-shaped molded body and the insulating container. 前記襞状成形体は、シリコン樹脂系ゴム材またはフッ素樹脂系ゴム材からなることを特徴とする請求項1または請求項2に記載の真空バルブ。   The vacuum valve according to claim 1 or 2, wherein the bowl-shaped molded body is made of a silicon resin rubber material or a fluororesin rubber material. 前記絶縁容器は、セラミックでかつ表面に釉薬が焼き付けられ、前記釉薬が焼き付けられた部分に前記襞状成形体が装着されていることを特徴とする請求項1から請求項3の何れかに記載の真空バルブ。   The said insulating container is ceramic, the glaze is baked on the surface, and the said molded object is mounted | worn to the part into which the said glaze was baked. Vacuum valve.
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JPS4910047U (en) * 1972-04-28 1974-01-28
JPS5622019A (en) * 1979-07-28 1981-03-02 Mitsubishi Electric Corp Vacuum switch
JPS5866213A (en) * 1981-10-15 1983-04-20 株式会社東芝 Insulator
JPS62184728A (en) * 1986-02-08 1987-08-13 神鋼電機株式会社 Vacuum switch
JPH0398216A (en) * 1989-09-11 1991-04-23 Nitto Denko Corp Manufacture of complex insulator
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US6753493B2 (en) * 2001-06-01 2004-06-22 Hubbell Incorporated Electrical circuit interrupting device
FR2868875B1 (en) * 2004-04-07 2011-09-23 Areva T & D Sa ELECTRICAL APPARATUS COMPRISING A COMPOSITE INSULATOR HAVING A CONTACTS OBSERVATION WINDOW
JP5203343B2 (en) * 2009-12-14 2013-06-05 日本特殊陶業株式会社 Ceramic insulator with glaze layer

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