JP2014099248A - Vacuum valve - Google Patents

Vacuum valve Download PDF

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JP2014099248A
JP2014099248A JP2012248897A JP2012248897A JP2014099248A JP 2014099248 A JP2014099248 A JP 2014099248A JP 2012248897 A JP2012248897 A JP 2012248897A JP 2012248897 A JP2012248897 A JP 2012248897A JP 2014099248 A JP2014099248 A JP 2014099248A
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movable
side end
bellows
movable side
end plate
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JP6053463B2 (en
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Yusuke Nishimura
勇佑 西村
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a vacuum valve which has a simple structure, therefore is easily assembled, and can be inexpensively manufactured.SOLUTION: The vacuum valve comprises: an insulating cylinder 23 surrounding a fixed electrode and a movable electrode opposed to each other; a movable side end plate 22 which is provided so as to airtightly close a movable electrode side end of the insulating cylinder, and has an insertion hole provided therein through which a movable side electrode bar connected to the movable electrode is inserted to the outside of the insulating cylinder; a bellows 4 which is in close contact with the movable side electrode bar and the movable side end plate, and holds airtightness; and a fixed side end plate 21 which is provided so as to airtightly close a fixed electrode side end of the insulating cylinder. The vacuum valve further has a stretchable insulating cover 5 provided, which is in close contact with a part outer side of the movable side end plate of the movable side electrode bar and the movable side end plate, and forms a sealed space 51 communicated with an airtight chamber 41 of the inside of the bellows.

Description

この発明は、耐圧力性能を向上させた真空バルブに関する。   The present invention relates to a vacuum valve with improved pressure resistance.

可動部の気密確保にベローズを用いた一般的な真空バルブにおいては、真空容器を構成する絶縁筒外部が大気圧下となる条件で使用した場合、ベローズには絶縁筒内の真空と外部の大気圧の差として１気圧の負荷がかかる。定格電圧が例えば７２ｋＶ以上の高圧用真空遮断器になると絶縁筒の沿面耐電圧性能を向上させるために、真空バルブ周囲にＳＦ６又はドライエア等の絶縁ガスが充填されるため、ベローズには真空と絶縁ガスの差圧に応じた負荷がさらに加わる。ベローズの圧力負荷が大きくなると、ベローズの座屈と、開閉時における圧力によって過大な応力が発生し、ベローズの疲労寿命が短くなる。そのため、遮断器の開閉寿命を満足させるベローズは、疲労に強い材料や径を大きくする必要があり、高価になる。ベローズに負荷される圧力を低減するための解決方法として、真空バルブ内部と真空バルブ周囲の絶縁ガスから密封された気密室を設けるようにしたものがある（例えば特許文献１参照）。 In general vacuum valves that use bellows to ensure the airtightness of moving parts, when the outside of the insulating cylinder that constitutes the vacuum vessel is used under atmospheric pressure, the bellows has a vacuum inside the insulating cylinder and a large external pressure. As a difference in atmospheric pressure, a load of 1 atm is applied. In order to improve the creeping withstand voltage performance of the insulation cylinder when the rated voltage is a high voltage vacuum circuit breaker of 72 kV or higher, for example, SF 6 or dry air or the like is filled around the vacuum valve. A load corresponding to the differential pressure of the insulating gas is further applied. When the pressure load of the bellows increases, excessive stress is generated due to the buckling of the bellows and the pressure at the time of opening and closing, and the fatigue life of the bellows is shortened. Therefore, a bellows that satisfies the open / close life of a circuit breaker needs to be made of a material and a diameter that are resistant to fatigue, and is expensive. As a solution for reducing the pressure applied to the bellows, there is one in which an airtight chamber sealed from an insulating gas inside and around the vacuum valve is provided (see, for example, Patent Document 1).

特開２００４−２２０９２２号公報（第１頁、図１）Japanese Patent Laying-Open No. 2004-220922 (first page, FIG. 1)

上記のようなベローズに負荷される圧力を低減する真空バルブにおいては、構造が複雑で、装置が大型化する、組立作業工程が増加する、材料費や組立費が増加するなどの問題点があった。   The vacuum valve for reducing the pressure applied to the bellows as described above has problems such as a complicated structure, an increase in the size of the apparatus, an increase in assembly process, and an increase in material cost and assembly cost. It was.

この発明は上記のような課題を解消するためになされたもので、構造が簡素で、従って組立も容易で安価に製造し得る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 an object of the present invention is to provide a vacuum valve that has a simple structure and is therefore easy to assemble and can be manufactured at low cost.

この発明に係る真空バルブは、対向された固定電極と可動電極のまわりを包囲する絶縁筒と、この絶縁筒の可動電極側端部を気密に塞ぐように設けられ前記可動電極に接続された可動側電極棒を前記絶縁筒の外部に挿通させる挿通孔が設けられた可動側端板と、前記可動側電極棒及び前記可動側端板に密着された気密を保持するベローズと、前記絶縁筒の固定電極側端部を気密に塞ぐように設けられた固定側端板を備えた真空バルブであって、前記可動側電極棒の前記可動側端板よりも外側部と前記可動側端板に密着され、前記ベローズの内側の気密室に連通された密閉空間を形成する伸縮性の絶縁カバーを設けたことを特徴とする。   The vacuum valve according to the present invention includes an insulating cylinder surrounding the fixed electrode and the movable electrode facing each other, and a movable electrode provided so as to hermetically close the movable electrode side end of the insulating cylinder and connected to the movable electrode. A movable side end plate provided with an insertion hole through which the side electrode rod is inserted to the outside of the insulating cylinder, a bellows that keeps airtight tightly attached to the movable side electrode rod and the movable side end plate, and the insulating cylinder A vacuum valve having a fixed side end plate provided so as to hermetically close the fixed electrode side end, and is in close contact with the outer side of the movable side electrode plate and the movable side end plate. And an elastic insulating cover that forms a sealed space communicating with the hermetic chamber inside the bellows.

この発明によれば、ベローズ内側の気密室とこの気密室に連通された密閉空間によって中間圧力室が形成されることで、ベローズに負荷される圧力を低減するようにしたので、構成が簡素であり、組立も容易で安価に製造することができる。   According to the present invention, since the intermediate pressure chamber is formed by the hermetic chamber inside the bellows and the sealed space communicating with the hermetic chamber, the pressure applied to the bellows is reduced, so the configuration is simple. Yes, it is easy to assemble and can be manufactured at low cost.

この発明の実施の形態１による真空バルブを概略的に示す縦断面図。BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view which shows schematically the vacuum valve by Embodiment 1 of this invention. 図１に示す真空バルブの電極が開離した状態を概略的に示す縦断面図。The longitudinal cross-sectional view which shows the state which the electrode of the vacuum valve shown in FIG. 1 opened apart. この発明の実施の形態２による真空バルブを概略的に示す縦断面図。The longitudinal cross-sectional view which shows schematically the vacuum valve by Embodiment 2 of this invention.

実施の形態１．
図１はこの発明の実施の形態１に係る真空バルブを概略的に示す縦断面図、図２は図１に示す真空バルブの電極が開離した状態を概略的に示す縦断面図である。図において、真空バルブは図の上部側に配設された固定側電極１１と、固定側電極１１に電気的、機械的に接続された固定側電極棒１２と、固定側電極棒１２を貫通させて気密に保持する固定側端板２１と、固定側電極１１に接離可能に対向された可動側電極３１と、可動側電極３１に電気的、機械的に接続された可動側電極棒３２と、固定側電極１１と可動側電極３１のまわりを包囲し、図の上端が固定側端板２１の外周部に気密に接合された絶縁筒２３と、この絶縁筒２３の可動電極側端部を気密に塞ぐように設けられ可動側電極棒３２を絶縁筒２３の外部に挿通させる挿通孔２２ａが設けられた可動側端板２２と、中央部に蛇腹部４ａを有し一端部が可動側電極棒３２に他端部が可動側端板２２にそれぞれ密着された気密を保持するベローズ４を備え、さらに可動側端板２２の背面側部に、可撓性の絶縁材料を用いた絶縁カバー５が設けられている。 Embodiment 1 FIG.
1 is a longitudinal sectional view schematically showing a vacuum valve according to Embodiment 1 of the present invention, and FIG. 2 is a longitudinal sectional view schematically showing a state where electrodes of the vacuum valve shown in FIG. 1 are separated. In the figure, the vacuum valve passes through the fixed side electrode 11 disposed on the upper side of the figure, the fixed side electrode rod 12 electrically and mechanically connected to the fixed side electrode 11, and the fixed side electrode rod 12. A fixed-side end plate 21 that is held in an airtight manner, a movable-side electrode 31 that is slidably opposed to the fixed-side electrode 11, and a movable-side electrode rod 32 that is electrically and mechanically connected to the movable-side electrode 31. The insulating cylinder 23 surrounding the fixed side electrode 11 and the movable side electrode 31 and having the upper end of the figure hermetically joined to the outer peripheral portion of the fixed side end plate 21, and the movable electrode side end of the insulating cylinder 23 A movable side end plate 22 provided with an insertion hole 22a that is provided so as to be airtightly closed and through which the movable side electrode rod 32 is inserted to the outside of the insulating cylinder 23, and a bellows portion 4a at the center portion, and one end portion is a movable side electrode. The rod 32 holds the airtightness in which the other end is in close contact with the movable side end plate 22. Comprising a chromatography's 4, further back side of the movable side end plate 22, insulating cover 5 using a flexible insulating material is provided.

この発明の特徴部分の一つである前記絶縁カバー５の材質は、特に限定されるものではないが、例えばベローズ４と同様の物理的電気的特性を有する材料、例えば各種ゴムやＰＴＦＥ（ポリテトラフルオロエチレン）などの可撓性と気密性を有する絶縁材料を好ましく用いることができる。絶縁カバー５は、この例では可動側電極棒３２の可動側端板２２よりも外側部（図の下部側）と可動側端板２２に跨るように設けられ、内側に密閉空間５１を形成するように構成されている。密閉空間５１は、挿通孔２２ａの部分でベローズ４の内側に形成された気密室４１と連通されており、前記密閉空間５１と気密室４１によって気密の中間圧力室６が形成されている。   The material of the insulating cover 5 which is one of the features of the present invention is not particularly limited. For example, the material having the same physical and electrical characteristics as the bellows 4, such as various rubbers and PTFE (polytetra An insulating material having flexibility and airtightness such as (fluoroethylene) can be preferably used. In this example, the insulating cover 5 is provided so as to straddle the outer side (lower side in the figure) and the movable side end plate 22 than the movable side end plate 22 of the movable side electrode rod 32, and forms a sealed space 51 on the inner side. It is configured as follows. The sealed space 51 communicates with an airtight chamber 41 formed inside the bellows 4 at the insertion hole 22a, and an airtight intermediate pressure chamber 6 is formed by the sealed space 51 and the airtight chamber 41.

そして、絶縁カバー５の図の上側の一端部５ａは可動側端板２２の背面部から絶縁筒２３の外周面の下部にまで跨って気密に連続して接合されている。また、絶縁カバー５の図の他端部５ｂは可動側電極棒３２の外周部と気密に接合されている。中間圧力室６内は真空バルブ内の真空空間２０と真空バルブの外部に充填される絶縁ガス（図示省略）の圧力の中間の圧力、又は大気圧とする。真空バルブを開離すると絶縁カバー５は図２に示すように伸長する。絶縁カバー５は遮断器開閉時のベローズ４内部の気密室４１と絶縁カバー５内部の密閉空間５１の体積変化量が同等になる形状にすると良い。また、絶縁カバー５の一端部５ａと他端部５ｂ間の長さ、即ち可動側端板２２から可動側電極棒３２との気密接合部までの長さを可動側電極棒３２の開閉時のストロークに見合った長さにすることでベローズ４と同等の疲労寿命性能を持たせることが好ましい。   The upper end portion 5 a of the insulating cover 5 in the figure is continuously and airtightly joined across from the back surface portion of the movable side end plate 22 to the lower portion of the outer peripheral surface of the insulating cylinder 23. Further, the other end portion 5 b of the insulating cover 5 in the drawing is airtightly joined to the outer peripheral portion of the movable electrode rod 32. The intermediate pressure chamber 6 has a pressure intermediate between the vacuum space 20 in the vacuum valve and the insulating gas (not shown) filled outside the vacuum valve, or atmospheric pressure. When the vacuum valve is opened, the insulating cover 5 extends as shown in FIG. The insulating cover 5 may have a shape in which the volume change amount of the hermetic chamber 41 inside the bellows 4 and the sealed space 51 inside the insulating cover 5 are equal when the circuit breaker is opened and closed. Further, the length between the one end portion 5 a and the other end portion 5 b of the insulating cover 5, that is, the length from the movable side end plate 22 to the hermetic joint between the movable side electrode rod 32, is determined when the movable side electrode rod 32 is opened and closed. It is preferable to give the fatigue life performance equivalent to that of the bellows 4 by making the length corresponding to the stroke.

次に、上記のように構成された実施の形態１の動作について説明する。まず、真空バルブの周囲に充填される例えばＳＦ６ガスやドライエアなどの絶縁性ガスは腐食性がなく、絶縁カバー５が劣化し難いため、絶縁カバー５の腐食による疲労寿命の低下はない。そして、そのような絶縁性ガスを充填しても、真空バルブ内の真空空間２０の真空圧と周囲に充填された絶縁性ガスとの圧力差が絶縁カバー５とベローズ４で分担されるため、絶縁カバー５が設けられていない場合よりも圧力差による負荷が軽減される。さらに、絶縁カバー５とベローズ４で圧力負荷が分担されることで遮断器開閉時の過大な応力発生も抑制される。 Next, the operation of the first embodiment configured as described above will be described. First, an insulating gas such as SF 6 gas or dry air filled around the vacuum valve is not corrosive and the insulating cover 5 is not easily deteriorated. Therefore, the fatigue life is not reduced by the corrosion of the insulating cover 5. And even if it fills with such an insulating gas, since the pressure difference of the vacuum pressure of the vacuum space 20 in a vacuum valve and the insulating gas with which the circumference | surroundings were filled is shared by the insulating cover 5 and the bellows 4, The load due to the pressure difference is reduced as compared with the case where the insulating cover 5 is not provided. Furthermore, since the pressure load is shared by the insulating cover 5 and the bellows 4, excessive stress generation when the circuit breaker is opened and closed is also suppressed.

遮断器開閉時のベローズ４内部の気密室４１と絶縁カバー５内部の密閉空間５１の体積変動は逆になり、例えば遮断器開極動作時は、ベローズ４内部の気密室４１の体積が減り、絶縁カバー５内部の密閉空間５１は体積が増える。ベローズ４内部と絶縁カバー５内部の伸縮による体積変化を同等とすると、遮断器開閉時の中間圧力室６の圧力変動が小さくなる。さらに、絶縁カバー５の一端部５ａは可動側端板２２の背面部から絶縁筒２３の外周面の下部にまで跨って気密に連続して接合されているため沿面距離が長くなり、絶縁筒２３の沿面耐電圧性能が向上する。   When the circuit breaker is opened and closed, the volume fluctuations of the airtight chamber 41 inside the bellows 4 and the sealed space 51 inside the insulating cover 5 are reversed. For example, when the circuit breaker opens, the volume of the airtight chamber 41 inside the bellows 4 decreases. The volume of the sealed space 51 inside the insulating cover 5 increases. If the volume change due to the expansion and contraction in the bellows 4 and the insulating cover 5 is made equal, the pressure fluctuation in the intermediate pressure chamber 6 when the circuit breaker is opened and closed is reduced. Further, since the one end portion 5a of the insulating cover 5 is continuously joined airtightly from the back surface portion of the movable side end plate 22 to the lower portion of the outer peripheral surface of the insulating tube 23, the creeping distance is increased, and the insulating tube 23 is increased. Improves creepage withstand voltage performance.

上記のように実施の形態１によれば、真空バルブ内の真空空間２０の真空圧と、真空バルブ外部に充填された絶縁性ガスの充填圧との圧力差を絶縁カバー５とベローズ４で分担させることで、ベローズ４に加わる圧力負荷を従来よりも軽減し、遮断器開閉時の過大な応力も抑制されるため、より径が小さいベローズや強度が低い材料のベローズを用いることができる。ベローズ径が小さくなると真空バルブの小径化及び軽量化が出来るため、遮断器の小型化、軽量化にも繋がり、コストも低減することが出来る。   As described above, according to the first embodiment, the insulating cover 5 and the bellows 4 share the pressure difference between the vacuum pressure in the vacuum space 20 in the vacuum valve and the filling pressure of the insulating gas filled outside the vacuum valve. By doing so, the pressure load applied to the bellows 4 is reduced more than before, and excessive stress at the time of opening and closing the circuit breaker is also suppressed. Therefore, a bellows having a smaller diameter or a material having a low strength can be used. When the bellows diameter is reduced, the diameter and weight of the vacuum valve can be reduced, leading to a reduction in the size and weight of the circuit breaker, and a reduction in cost.

また、遮断器開閉時のベローズ４内部と絶縁カバー５内部の伸縮による体積変化が同等であると、開閉時の圧力変動が小さく、ベローズ４及び絶縁カバー５に圧力変動による座屈や過大な応力発生等の影響がない。また、絶縁カバー５は蛇腹構造を設けていないため、電極接離時の過渡的な振動の伝搬がなく、電極接離後の自由振動による応力発生の影響がない。更に、絶縁カバー５の一端部５ａは可動側端板２２の背面部から絶縁筒２３の外周面の下部にまで跨って気密に連続して接合され沿面耐電圧性能が向上することで、真空バルブの軸方向の長さを小さくすることが可能となり、真空バルブの小型化や軽量化が図られ、コストを安くすることができる。従来のベローズに負荷される圧力を低減する構造よりも、より簡易的に中間圧力室６を設けたことで、装置の大型化抑制、組立作業の工程数増加の抑制、及び材料費や組立費の増加抑制などを図ることができる。   Also, if the volume change due to expansion and contraction inside the bellows 4 and the insulating cover 5 when the circuit breaker is opened and closed is equal, the pressure fluctuation during opening and closing is small, and the bellows 4 and the insulating cover 5 are buckled or excessively stressed due to pressure fluctuation. There is no influence of occurrence. Further, since the insulating cover 5 is not provided with a bellows structure, there is no propagation of transient vibrations when the electrodes are contacted and separated, and there is no influence of stress generation due to free vibration after the electrodes are contacted and separated. Further, the one end portion 5a of the insulating cover 5 is continuously joined airtightly from the back surface portion of the movable side end plate 22 to the lower portion of the outer peripheral surface of the insulating cylinder 23, thereby improving the creeping withstand voltage performance. It is possible to reduce the length in the axial direction, and the vacuum valve can be reduced in size and weight, and the cost can be reduced. By providing the intermediate pressure chamber 6 more simply than the conventional structure for reducing the pressure applied to the bellows, it is possible to suppress the increase in the size of the apparatus, the increase in the number of assembly steps, and the material cost and assembly cost. It is possible to suppress the increase in the amount.

実施の形態２．
図３はこの発明の実施の形態２による真空バルブを概略的に示す縦断面図である。図３において、可動側端板２２の下部に配設された絶縁カバー５Ａは蛇腹状に形成され、一端部５Ａａは可動側端板２２の背面部の外周側部分から絶縁筒２３の外周面下部にまで跨って連続して気密に接合され、他端部５Ａｂは可動側電極棒３２に気密に接合されている。また、可動側端板２２との接合部である絶縁カバー５Ａの蛇腹谷部５２は他の谷部と形状が同等になるよう蛇腹が連続するような形状で接合されている。絶縁カバー５Ａの内部に形成された密閉空間５Ａ１は、ベローズ４側の気密室４１と同様に連通され、中間圧力室６Ａが形成されている。なお、絶縁カバー５Ａは遮断器開閉時のベローズ４内部の気密室４１と絶縁カバー５Ａ内部の密閉空間５Ａ１の体積変化量が同等になる形状にすると良い。絶縁カバー５Ａの蛇腹状部分の山の数や厚み等の形状は、遮断器開閉時にベローズ４に発生する疲労損傷と同等になるようにする。絶縁カバー５Ａの材質など、その他の構成は実施の形態１と同様であるので説明を省略する。 Embodiment 2. FIG.
3 is a longitudinal sectional view schematically showing a vacuum valve according to Embodiment 2 of the present invention. In FIG. 3, the insulating cover 5 </ b> A disposed below the movable side end plate 22 is formed in a bellows shape, and one end portion 5 </ b> Aa extends from the outer peripheral side portion of the back side of the movable side end plate 22 to the lower part of the outer peripheral surface of the insulating cylinder 23. The other end 5Ab is airtightly joined to the movable electrode rod 32. Further, the bellows valley portion 52 of the insulating cover 5A, which is a joint portion with the movable side end plate 22, is joined in such a shape that the bellows is continuous with the other valley portions so as to have the same shape. The sealed space 5A1 formed inside the insulating cover 5A is communicated similarly to the airtight chamber 41 on the bellows 4 side, and an intermediate pressure chamber 6A is formed. The insulating cover 5A may have a shape in which the volume change amount of the hermetic chamber 41 inside the bellows 4 and the sealed space 5A1 inside the insulating cover 5A is equal when the circuit breaker is opened and closed. The shape of the bellows-like portion of the insulating cover 5A, such as the number of ridges and the thickness, is made equal to the fatigue damage that occurs in the bellows 4 when the circuit breaker is opened and closed. Since other structures such as the material of the insulating cover 5A are the same as those in the first embodiment, the description thereof is omitted.

上記のように構成された実施の形態２においては、真空バルブの周囲に絶縁ガスを所定圧力で充填する使い方を行っても、真空バルブ内の真空圧と絶縁ガスの圧力差が実施の形態１と同様に絶縁カバー５Ａとベローズ４で分担されるため、圧力による負荷が軽減される。又、絶縁カバー５Ａとベローズ４で圧力負荷が分担されることで遮断器開閉時の過大な応力発生も抑制される。遮断器開閉時のベローズ４と絶縁カバー５Ａは伸縮動作が逆になる。ベローズ内部と絶縁カバー内部の伸縮による体積変化を同等とすると遮断器開閉時の中間圧力室６Ａの圧力変動が小さくなる。絶縁カバー５Ａを可動側端板２２の背面部から絶縁筒２３の外周面下部まで連続して気密に接合しているため、絶縁筒２３の沿面耐電圧性能が向上する。   In the second embodiment configured as described above, even if the insulating gas is filled around the vacuum valve at a predetermined pressure, the difference between the vacuum pressure in the vacuum valve and the insulating gas is the first embodiment. Since the insulating cover 5A and the bellows 4 share the same load, the load due to pressure is reduced. Further, since the pressure load is shared by the insulating cover 5A and the bellows 4, excessive stress generation at the time of opening and closing the circuit breaker is also suppressed. The bellows 4 and the insulating cover 5A at the time of opening and closing the circuit breaker are reversely expanded and contracted. If the volume change due to expansion and contraction inside the bellows and the insulating cover is made equal, the pressure fluctuation in the intermediate pressure chamber 6A when the circuit breaker is opened and closed becomes small. Since the insulating cover 5A is continuously and airtightly joined from the back surface of the movable side end plate 22 to the lower portion of the outer peripheral surface of the insulating cylinder 23, the creeping voltage resistance performance of the insulating cylinder 23 is improved.

上記のように実施の形態２によれば、真空と絶縁ガスの圧力差を絶縁カバー５Ａとベローズ４で分担し、圧力負荷を軽減し、遮断器開閉時の過大な応力も抑制されるため、径が小さいベローズや強度が低い材料のベローズを用いることができる。ベローズ径が小さくなると真空バルブの小径化及び軽量化が出来るため、遮断器の小型化・軽量化にも繋がり、コストも安くすることが出来る。遮断器開閉時のベローズ内部と絶縁カバー内部の伸縮による体積変化を同等にすることで、開閉時の圧力変動が小さく、ベローズ４及び絶縁カバー５Ａに圧力変動による座屈や過大な応力発生等の影響を抑制できる。可動側端板２２と絶縁カバー５Ａの接合部である蛇腹谷部５２の形状が他の谷部と異なると、真空バルブ接離時に応力集中が発生し、疲労破壊部になる可能性があるが、形状が同等になるよう連続した形状で接合することで、真空バルブ接離時の伸縮による疲労寿命を各部均一にすることができる。   As described above, according to the second embodiment, since the pressure difference between the vacuum and the insulating gas is shared by the insulating cover 5A and the bellows 4, the pressure load is reduced, and excessive stress at the time of opening and closing the circuit breaker is also suppressed. A bellows having a small diameter or a material having a low strength can be used. As the bellows diameter becomes smaller, the vacuum valve can be made smaller and lighter, leading to a smaller and lighter circuit breaker and a lower cost. By making the volume change due to expansion and contraction inside the bellows and the inside of the insulating cover when the circuit breaker is opened and closed, the pressure fluctuation at the time of opening and closing is small, buckling due to pressure fluctuation and excessive stress generation etc. in the bellows 4 and insulating cover 5A The influence can be suppressed. If the shape of the bellows valley portion 52, which is the joint between the movable side end plate 22 and the insulating cover 5A, is different from other valley portions, stress concentration occurs when the vacuum valve contacts and separates, and there is a possibility of becoming a fatigue fracture portion. By joining in a continuous shape so that the shapes are the same, the fatigue life due to expansion and contraction at the time of vacuum valve contact and separation can be made uniform in each part.

さらに、絶縁カバー５Ａを真空バルブの可動側端板２２の背面部から絶縁筒２３の外周面下部にまで跨って気密に連続的に接合し、沿面耐電圧性能が向上することで、真空バルブの軸方向の長さを小さくでき、真空バルブの小型化や軽量化を図り、さらにコストを安くすることができる。従来の構造よりも、より簡易的に中間圧力室６Ａを設けたことで、装置の大型化抑制、組立作業の工程数増加の抑制、及び材料費や組立費の増加抑制などを図ることができる。   Furthermore, the insulating cover 5A is continuously and airtightly joined from the back surface of the movable side end plate 22 of the vacuum valve to the lower portion of the outer peripheral surface of the insulating cylinder 23, and the creeping voltage resistance performance is improved. The axial length can be reduced, the vacuum valve can be made smaller and lighter, and the cost can be further reduced. By providing the intermediate pressure chamber 6A more simply than the conventional structure, it is possible to suppress the increase in the size of the apparatus, the increase in the number of assembly steps, and the increase in material costs and assembly costs. .

なお、本発明は、その発明の範囲内において、各実施の形態の一部または全部を自由に組み合わせたり、各実施の形態を適宜、変形、省略することが可能である。   It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

１１ 固定側電極、 １２ 固定側電極棒、 ２０ 真空空間、 ２１ 固定側端板、 ２２ 可動側端板、 ２２ａ 挿通孔、 ２３ 絶縁筒、 ３１ 可動側電極、 ３２ 可動側電極棒、 ４ ベローズ、 ４ａ 蛇腹部、 ４１ 気密室、 ５、５Ａ 絶縁カバー、 ５ａ、５Ａａ 一端部、 ５ｂ、５Ａｂ 他端部、 ５１、５Ａ１ 密閉空間、 ５２ 蛇腹谷部、 ６、６Ａ 中間圧力室。   DESCRIPTION OF SYMBOLS 11 Fixed side electrode, 12 Fixed side electrode rod, 20 Vacuum space, 21 Fixed side end plate, 22 Movable side end plate, 22a Insertion hole, 23 Insulating cylinder, 31 Movable side electrode, 32 Movable side electrode rod, 4 Bellows, 4a A bellows portion, 41 an airtight chamber, 5, 5A insulating cover, 5a, 5Aa one end portion, 5b, 5Ab the other end portion, 51, 5A1 sealed space, 52 a bellows valley portion, 6, 6A intermediate pressure chamber.

Claims (4)

対向された固定電極と可動電極のまわりを包囲する絶縁筒と、この絶縁筒の可動電極側端部を気密に塞ぐように設けられ前記可動電極に接続された可動側電極棒を前記絶縁筒の外部に挿通させる挿通孔が設けられた可動側端板と、前記可動側電極棒及び前記可動側端板に密着された気密を保持するベローズと、前記絶縁筒の固定電極側端部を気密に塞ぐように設けられた固定側端板を備えた真空バルブであって、前記可動側電極棒の前記可動側端板よりも外側部と前記可動側端板に密着され、前記ベローズの内側の気密室に連通された密閉空間を形成する伸縮性の絶縁カバーを設けたことを特徴とする真空バルブ。   An insulating cylinder surrounding the fixed electrode and the movable electrode facing each other, and a movable side electrode rod provided so as to airtightly close the movable electrode side end of the insulating cylinder and connected to the movable electrode. The movable side end plate provided with an insertion hole for insertion to the outside, the bellows that keeps airtight tightly attached to the movable side electrode rod and the movable side end plate, and the fixed electrode side end of the insulating cylinder are hermetically sealed. A vacuum valve provided with a fixed end plate provided so as to be closed, and is in close contact with the outer side of the movable side electrode plate and the movable side end plate of the movable side electrode rod, and the gas inside the bellows. A vacuum valve comprising a stretchable insulating cover that forms a sealed space communicating with a closed chamber. 前記絶縁カバーの前記可動側端板との密着部は、前記可動側端板の背面部から前記絶縁筒の外周面に跨って連続して密着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 contact portion of the insulating cover with the movable side end plate is continuously in contact with the outer peripheral surface of the insulating tube from the back surface of the movable side end plate. Vacuum valve. 前記絶縁カバーは、前記可動側電極棒の外周部を包囲する部分が蛇腹状に形成されていることを特徴とする請求項１又は請求項２に記載の真空バルブ。   3. The vacuum valve according to claim 1, wherein the insulating cover has a bellows-shaped portion surrounding the outer peripheral portion of the movable electrode rod. 4. 前記ベローズと前記絶縁カバーの前記可動側電極棒の作動に伴う伸縮による体積変化が互いに同等となるようにした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 vacuum valve according to any one of claims 1 to 3, wherein volume changes due to expansion and contraction due to operation of the movable electrode rod of the bellows and the insulating cover are equal to each other.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114334529A (en) * 2020-10-09 2022-04-12 西安西电高压开关有限责任公司 Vacuum arc-extinguishing chamber and vacuum switch

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979587A (en) * 1958-10-28 1961-04-11 Jennings Radio Mfg Corp Vacuum electric switch
JPS5229946U (en) * 1975-08-25 1977-03-02
JPS54137863U (en) * 1978-03-20 1979-09-25
JP2003031091A (en) * 2001-07-12 2003-01-31 Mitsubishi Electric Corp Electric power switch device
JP2003187679A (en) * 2001-12-14 2003-07-04 Meidensha Corp Vacuum interrupter
JP2004236455A (en) * 2003-01-31 2004-08-19 Hitachi Ltd Gas-insulated switchgear
JP2005243441A (en) * 2004-02-26 2005-09-08 Mitsubishi Electric Corp Switching device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2979587A (en) * 1958-10-28 1961-04-11 Jennings Radio Mfg Corp Vacuum electric switch
JPS5229946U (en) * 1975-08-25 1977-03-02
JPS54137863U (en) * 1978-03-20 1979-09-25
JP2003031091A (en) * 2001-07-12 2003-01-31 Mitsubishi Electric Corp Electric power switch device
JP2003187679A (en) * 2001-12-14 2003-07-04 Meidensha Corp Vacuum interrupter
JP2004236455A (en) * 2003-01-31 2004-08-19 Hitachi Ltd Gas-insulated switchgear
JP2005243441A (en) * 2004-02-26 2005-09-08 Mitsubishi Electric Corp Switching device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114334529A (en) * 2020-10-09 2022-04-12 西安西电高压开关有限责任公司 Vacuum arc-extinguishing chamber and vacuum switch
CN114334529B (en) * 2020-10-09 2023-11-10 西安西电高压开关有限责任公司 Vacuum arc-extinguishing chamber and vacuum switch

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