JP2762480B2 - Vacuum switch tube - Google Patents
Vacuum switch tubeInfo
- Publication number
- JP2762480B2 JP2762480B2 JP63237106A JP23710688A JP2762480B2 JP 2762480 B2 JP2762480 B2 JP 2762480B2 JP 63237106 A JP63237106 A JP 63237106A JP 23710688 A JP23710688 A JP 23710688A JP 2762480 B2 JP2762480 B2 JP 2762480B2
- Authority
- JP
- Japan
- Prior art keywords
- vacuum vessel
- vacuum
- cylindrical
- switch tube
- cylindrical vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/662—Housings or protective screens
- H01H33/66207—Specific housing details, e.g. sealing, soldering or brazing
- H01H2033/66215—Details relating to the soldering or brazing of vacuum switch housings
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、真空スイッチ管の端板の固着方法の改良
に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of fixing an end plate of a vacuum switch tube.
一般に真空スイッチ管は、絶縁物からなる真空容器内
にベローズを介して接離自在な一対の電極を収納し、こ
れを真空密閉して構成している。In general, a vacuum switch tube includes a pair of electrodes that can be freely connected to and separated from each other via a bellows in a vacuum container made of an insulating material, and is configured to be vacuum-sealed.
従来の真空スイッチ管は排気管から排気して機密封止
を行っていたが、最近は排気管を用いずに真空中でろう
付けする方法が提案されている。これは真空ろう付炉の
中に、真空スイッチ管の構成部品を設置し、炉内を10-4
Torr以下の高真空中に排気し、400℃〜600℃の高温でベ
ーキングして脱ガスを十分に行った後、ろう付温度に加
熱して最終封じ箇所のろう材を溶かし、気蜜封じを行う
方法である。この時の真空スイッチ管の構成部品は、一
般に予めろう付により部品組立された可動側組立部品，
固定側組立品、真空容器から成り、最終封止箇所として
は、真空容器の端部の少なくとも一方が用いられる。A conventional vacuum switch tube exhausts air from an exhaust pipe to seal airtightness, but recently, a method of brazing in a vacuum without using an exhaust pipe has been proposed. This is in a vacuum brazing furnace, installing the components of the vacuum switch tube, the furnace 10 -4
After evacuating to a high vacuum of Torr or less, baking at a high temperature of 400 ° C to 600 ° C and performing sufficient degassing, heating to brazing temperature to melt the brazing material at the final sealing point, How to do it. At this time, the components of the vacuum switch tube generally include a movable-side assembly component previously assembled by brazing,
The fixed-side assembly and the vacuum vessel are used, and at least one of the ends of the vacuum vessel is used as a final sealing portion.
第５図、第６図は例えば特開昭61−230221号公報に示
された上記真空炉中ろう付け法による真空スイッチ管
（100）を示す断面図及び斜視図であり、図において、
（１）は真空容器、（２）は固定側端板、（３）は可動
側端板である。端板（２）は内側端板（16）と外側端板
（17）から成り、内側端板（16）の一端は途中に形成し
た段部（16a）を介して、真空容器内側に折曲げられた
内側突出部（16b）を形成している。内側突出部（16b）
の端面は第６図に示すように周辺に沿って３個の切欠片
（16c）を形成し、切欠片（16c）は外側に円弧状に曲げ
た曲面部（16d）を形成している。外側端板（17）の一
端は段部（16a）に溶接またはろう付けで固定し、他端
は真空容器端面（1a）側に折曲げて外側突出部（17a）
を形成する。外側突出部（17a）は真空容器（1a）端面
に設けたろう材（18）を介して真空容器端面（1a）に固
着する。5 and 6 are a sectional view and a perspective view, respectively, showing a vacuum switch tube (100) by the above-described vacuum furnace brazing method disclosed in JP-A-61-230221.
(1) is a vacuum vessel, (2) is a fixed end plate, and (3) is a movable end plate. The end plate (2) comprises an inner end plate (16) and an outer end plate (17), and one end of the inner end plate (16) is bent inside the vacuum vessel via a step (16a) formed in the middle. The inner protrusion (16b) is formed. Inside protrusion (16b)
6, three notches (16c) are formed along the periphery as shown in FIG. 6, and the notch (16c) forms a curved surface portion (16d) bent outward in an arc shape. One end of the outer end plate (17) is fixed to the step (16a) by welding or brazing, and the other end is bent toward the end surface (1a) of the vacuum vessel to form an outer protrusion (17a).
To form The outer protruding portion (17a) is fixed to the vacuum vessel end face (1a) via a brazing material (18) provided on the vacuum vessel (1a) end face.
真空容器端面（1a）とろう材（18）を介して端板
（２）は当接しているが、真空容器端面（1a）は予めMo
等の金属がメタライズされていて、ろう付け性を良くし
いる。ろう付けはろう材（18）を真空容器端面の円周方
向に沿って凸凹を形成し、外側突出部（17a）はろう材
（18）を当接した状態で真空炉に入れて真空加熱をす
る。炉の温度上昇に伴い曲面部（16d）は熱膨張して、
外側つまり真空容器（１）の内面側に伸びて、真空容器
（１）の内側を押圧して、端板（16）を真空容器（１）
に保持し、位置決めをする。このとき、曲面部（16d）
のバネ応力により、押圧力を緩和し、真空容器（１）の
破損を防いでいる。以上は固定側端板（２）について述
べたが、可動側端板（３）も同様な構成となっている。The end plate (2) is in contact with the end face (1a) of the vacuum vessel via the brazing material (18), but the end face (1a) of the vacuum vessel is Mo in advance.
And other metals are metallized to improve brazing properties. For brazing, the brazing material (18) is formed along the circumferential direction of the end face of the vacuum vessel, and the outer protruding portion (17a) is placed in a vacuum furnace with the brazing material (18) in contact with it to perform vacuum heating. I do. The curved surface (16d) thermally expands as the furnace temperature rises,
The end plate (16) extends to the outside, that is, the inside of the vacuum vessel (1), and presses the inside of the vacuum vessel (1), and the end plate (16) is placed in the vacuum vessel (1).
And position it. At this time, the curved surface part (16d)
The spring force of the above reduces the pressing force and prevents breakage of the vacuum vessel (1). In the above, the fixed-side end plate (2) has been described, but the movable-side end plate (3) has the same configuration.
以上の様に構成した真空スイッチ管（100）内の空気
は矢印で示す様に排気され、封止部のろう材（18）が溶
け、固まることにより内部を真空にした真空スィッチ管
（100）が形成される。The air in the vacuum switch tube (100) configured as described above is exhausted as shown by the arrow, and the brazing filler metal (18) in the sealing portion is melted and solidified to make the inside a vacuum switch tube (100). Is formed.
従来の真空スイッチ管は以上のように構成されていた
が、真空容器はAl2O3等の材料から成る焼成品であるの
で、焼成後の内径寸法のバラツキが大きく、個々の真空
容器内径に合せて、端板の位置決め手段例えば治具が必
要であった。また、大形品ほど端板強度を上げる必要が
あり、肉厚の厚い材料を使用するので、曲面部も機械的
に強固になり、ろう付け時に真空容器を破損する恐れが
あった。Although the conventional vacuum switch tube was configured as described above, since the vacuum container is a fired product made of a material such as Al 2 O 3 , there is a large variation in inner diameter dimensions after firing, and the inner diameter of each vacuum container is large. In addition, positioning means for the end plate, for example, a jig is required. Also, the larger the product, the higher the strength of the end plate and the thicker the material used. Therefore, the curved surface becomes mechanically strong, and the vacuum vessel may be damaged during brazing.
この発明は上記のような問題点を解消するためになさ
れたもので、真空容器を破損する恐れがなく、ろう付に
よる最終封止時に治具を必要とせずに真空容器と端板と
の正確な位置決めが可能な真空スイッチ管を得ること目
的とする。The present invention has been made in order to solve the above-mentioned problems, and there is no possibility of damaging the vacuum container, and the jig is not required at the time of final sealing by brazing. It is an object of the present invention to obtain a vacuum switch tube capable of performing accurate positioning.
この発明に係る真空スイッチ管は真空容器と、この真
空容器の両端に配置され中央部に電極棒が貫通し、外周
部に突出部を設けた端板を有し、真空容器の端部と、端
板の突出部とを真空炉中ろう付けするものにおいて、上
記突出部内面と、真空容器内面にそれそれ係止し、端板
と真空容器との位置決めを行う径方向にばね性を有した
リングを備えたものである。The vacuum switch tube according to the present invention has a vacuum vessel, and an end plate provided at both ends of the vacuum vessel, through which an electrode rod penetrates at a central portion, and provided with a protruding portion at an outer peripheral portion, In the brazing of the protruding portion of the end plate in a vacuum furnace, the protruding portion inner surface and the inner surface of the vacuum vessel are respectively engaged with the protruding portion, and have a resilient property in a radial direction for positioning the end plate and the vacuum container. It has a ring.
この発明における真空スイッチ管は、径方向にばね性
を有するリングによって、端板と真空容器が位置決めさ
れ、さらに真空炉中ろう付けの熱膨張時の正確な位置合
せを保持すると共に真空容器の応力緩和がなされる。In the vacuum switch tube according to the present invention, the end plate and the vacuum vessel are positioned by a ring having a spring property in a radial direction, and further, accurate alignment during thermal expansion of brazing in a vacuum furnace is maintained, and the stress of the vacuum vessel is maintained. Relaxation takes place.
以下、この発明の一実施例を図について説明する。第
１図は真空スイッチ管（100a）を示し、（１）はAl2O3
等の絶縁物で形成された真空容器、（2a）は固定端板、
（3a）は可動側端板、（４）はベローズ、（５）は固定
電極棒、（６）は可動電極棒、（７）は固定電極、
（８）は可動電極であり、それぞれ固定電極棒（５），
可動電極棒（６）に固着されている。（９）はシールド
であり、電流開閉時に電極（７）・（８）から発生する
金属蒸気で真空容器（１）の内面が汚損されるのを防止
している。ベローズ（４）は可動側端板（3a）と可動電
極棒（６）との間に設けられていて、真空スイッチ管
（100a）内部の真空気密を保持しながら電極（７）・
（８）の接離を可能にしている。An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a vacuum switch tube (100a), and (1) shows Al 2 O 3
Vacuum container made of insulators, etc., (2a) is a fixed end plate,
(3a) is a movable end plate, (4) is a bellows, (5) is a fixed electrode rod, (6) is a movable electrode rod, (7) is a fixed electrode,
(8) are movable electrodes, which are fixed electrode rods (5) and (5), respectively.
It is fixed to the movable electrode rod (6). (9) is a shield, which prevents the inner surface of the vacuum vessel (1) from being stained by metal vapor generated from the electrodes (7) and (8) when the current is switched. The bellows (4) is provided between the movable side end plate (3a) and the movable electrode rod (6), and maintains the vacuum tightness inside the vacuum switch tube (100a) while keeping the electrodes (7).
(8) is possible.
この様な構成部品から成る真空スイッチ管（100a）
は、まず、ろう付け等により部分的に組立てられ、第２
図に示す様に固定側組立品（11），可動側組立品（1
2），シールド（９）を組込んだ真空容器組立品（13）
とされる。Vacuum switch tube (100a) consisting of such components
Is partially assembled by brazing, etc.
As shown in the figure, the fixed-side assembly (11) and the movable-side assembly (1
2), Vacuum container assembly incorporating shield (9) (13)
It is said.
端板（2a）（3a）の外周部は真空容器端面（1a）側に
折曲げて突出部（2b）（3b）を形成しており、真空容器
端面（1a）に設けられたろう材（18）を介して真空容器
端面（1a）に設置される。固定側組立品（11）および可
動側組立品（12）と真空容器組立品（13）の位置決め
は、第１図に示すように真空容器（１）の内周側および
端板（2a）（3a）の突出部（2b）（3b）に係止して設置
されたリング（15）により行なわれる。このリング（1
5）は0.5mm以下の薄肉の金属材料で、断面が円筒部（15
a）と曲面部（15b）形状を有する円環で、全体としてバ
ネ性をもっている。ここで曲面部（15b）形状を有する
側のリング（15）の端部を第１のリング端部といい、円
筒形状（15a）を有する他のリングの端部を第２のリン
グ端部という。それ故に、真空容器（１）の内径寸法の
バラツキに応じて円筒部（15a）は端板（2a）（3a）の
突出部（2b）（3b）の内面（2c）（3c）に係止し、曲面
部（15b）が真空容器（１）の内面（1b）に係止して端
板（2a）（3a）と真空容器（１）との位置決めを行って
いる。真空容器（１）の端面（1a）にはろう材（18）が
設けられ、その形状は円周方向に沿って凹凸を形成して
いる。また、端板（2a）（3a）の突出部（2b）（3b）と
リング（15）の円筒部（15a）の間にも図示を省略した
ろう材が設けられている。この様に設置された状態で真
空炉に入れて真空加熱すると、リング（15）は熱膨張が
均一におこり、軸方向に曲面部（15b）を有している
為、熱膨張によって真空容器（１）を押圧する力は緩和
され、真空容器（１）を破壊する恐れなく、またバネ性
をもつため正確な位置合わせを保持することが可能とな
る。また、リング（15）は端板（2a）・（3a）と別個の
部品であるので、大形の真空スイッチ管に必要とされる
端板（2a）・（3a）の厚肉寸法の設定が自由となり従来
の如く、バネ性と端板強度のかね合いによるろう付け時
の熱膨張による真空容器の破損はない。The outer peripheral portions of the end plates (2a) and (3a) are bent toward the vacuum vessel end face (1a) to form protrusions (2b) and (3b), and the brazing material (18) provided on the vacuum vessel end face (1a) is formed. ) Is installed on the end face (1a) of the vacuum vessel. As shown in FIG. 1, the fixed side assembly (11), the movable side assembly (12) and the vacuum vessel assembly (13) are positioned on the inner peripheral side of the vacuum vessel (1) and the end plate (2a) ( This is performed by a ring (15) which is installed by being locked to the protrusions (2b) and (3b) of 3a). This ring (1
5) is a thin metal material of 0.5mm or less and has a cylindrical section (15
a) and a ring having the shape of a curved surface portion (15b), which has spring properties as a whole. Here, the end of the ring (15) having the curved surface (15b) shape is referred to as a first ring end, and the end of the other ring having a cylindrical shape (15a) is referred to as a second ring end. . Therefore, the cylindrical portion (15a) is locked to the inner surfaces (2c) (3c) of the protruding portions (2b) (3b) of the end plates (2a) (3a) according to the variation in the inner diameter of the vacuum vessel (1). Then, the curved surface portion (15b) is engaged with the inner surface (1b) of the vacuum vessel (1) to position the end plates (2a) (3a) and the vacuum vessel (1). A brazing material (18) is provided on the end surface (1a) of the vacuum vessel (1), and the shape thereof is uneven along the circumferential direction. Also, a brazing material (not shown) is provided between the projections (2b) (3b) of the end plates (2a) (3a) and the cylindrical portion (15a) of the ring (15). When placed in such a state and placed in a vacuum furnace and heated in vacuum, the ring (15) undergoes uniform thermal expansion and has a curved surface portion (15b) in the axial direction. The force for pressing 1) is reduced, and there is no danger of breaking the vacuum vessel (1), and accurate positioning can be maintained due to the spring property. Since the ring (15) is a separate part from the end plates (2a) and (3a), the thickness of the end plates (2a) and (3a) required for large vacuum switch tubes must be set. As in the prior art, there is no breakage of the vacuum vessel due to thermal expansion during brazing due to the balance between spring properties and end plate strength.
また、リング（15）は真空容器（１）の両端面（1a）
に設けられた図示しないメタライズ層を被っている。こ
のメタライズ層部は10μ程度の薄い金属層で、電界集中
の発生する箇所であり、リング（15）が電界緩和の役目
を果たしている。従って、従来例のものに比べて耐電圧
特性が向上するとともに、特別の電界緩和リング等の設
置を必要としない。The ring (15) is at both ends (1a) of the vacuum vessel (1).
(Not shown). This metallized layer portion is a thin metal layer of about 10 μm, where the electric field concentration occurs, and the ring (15) plays a role of electric field relaxation. Therefore, the withstand voltage characteristics are improved as compared with the conventional example, and no special electric field relaxation ring or the like is required.
なお、上記実施例ではリング（５）は円筒部と曲面部
を持つものについて説明したが、第３図に示す様にＳ字
形とすることによりバネ力を更に増すことが可能であ
る。またさらに第４図に示す様にくの字形にすることも
でき、径方向にバネ力を持つ形状ならば上記実施例の形
状に限定されることなく、上記実施例と同様の効果を奏
する。In the above embodiment, the ring (5) is described as having a cylindrical portion and a curved surface portion. However, the spring force can be further increased by forming the ring (5) into an S shape as shown in FIG. Further, as shown in FIG. 4, it is also possible to form a U-shape, and if the shape has a spring force in the radial direction, it is not limited to the shape of the above embodiment, and the same effect as the above embodiment can be obtained.
また、リング（15）はその中央に切欠き部や穴部を設
け、排気コンダクタンスを大きくすることも可能であ
る。In addition, the ring (15) can be provided with a notch or a hole at the center thereof to increase the exhaust conductance.
また真空容器（１）は絶縁物のものを示したが端板と
は絶縁された金属性のものであってもよい。Although the vacuum container (1) is made of an insulating material, it may be made of a metal material insulated from the end plate.
真空容器（１）を第１の円筒状真空容器、端板（2a）
または端板（3a）を第２の円筒状真空容器と言う。Vacuum container (1) as first cylindrical vacuum container, end plate (2a)
Alternatively, the end plate (3a) is referred to as a second cylindrical vacuum vessel.
以上のように、この発明によれば、真空容器の端部
と、端板の突出部とを真空炉中ろう付けする真空スイッ
チ管において、上記突出部内面と、真空容器内面に係止
した径方向にばね性を有するリングを備えるように構成
したので、真空容器のバラツキによる端板との位置決め
が容易となって、位置決め用の治工具類を不要とし、ま
た、ばね性をもつ故にろう付け時の熱膨張による位置合
せを保持しつつ、真空容器の押圧力が緩和されて真空容
器の破損が無くなり、精度のよい、安価な真空スイッチ
層を提供出来る効果がある。As described above, according to the present invention, in a vacuum switch tube for brazing an end portion of a vacuum vessel and a projection of an end plate in a vacuum furnace, the inner diameter of the projection and the diameter locked to the inner surface of the vacuum vessel. Since it is configured to have a ring having a spring property in the direction, positioning with the end plate due to the variation of the vacuum vessel becomes easy, and no jigs and tools for positioning are required. While maintaining the alignment by thermal expansion at the time, the pressing force of the vacuum container is reduced, and the vacuum container is not damaged, so that an accurate and inexpensive vacuum switch layer can be provided.
第１図はこの発明の一実施例による真空スイッチ管を示
す断面図、第２図は部品組立品を示す真空スイッチ管の
断面図、第３図・第４図はこの発明の他の実施例を示す
断面図、第５図・第６図は従来の真空スイッチ管を示す
断面図及び斜視図である。 （１）は真空容器、（2a）は固定側端板、（3a）は可動
側端板、（2b）（3b）は突出部、（2c）（3c）は突出部
内面、（15）はリング、（15a）は円筒部、（15c）は曲
面部である。 なお図中、同一符号は、同一または相当部分を示す。1 is a sectional view showing a vacuum switch tube according to an embodiment of the present invention, FIG. 2 is a sectional view of a vacuum switch tube showing a component assembly, and FIGS. 3 and 4 are other embodiments of the present invention. 5 and 6 are a sectional view and a perspective view showing a conventional vacuum switch tube. (1) is a vacuum vessel, (2a) is a fixed end plate, (3a) is a movable end plate, (2b) and (3b) are protrusions, (2c) and (3c) are protrusion protrusion inner surfaces, and (15) is A ring, (15a) is a cylindrical portion, and (15c) is a curved surface portion. In the drawings, the same reference numerals indicate the same or corresponding parts.
Claims (2)
器と、該第１の円筒状真空容器の軸方向端面に互いにろ
う付けされる軸方向端面を有する第２の円筒状真空容器
とを有する真空スイッチ管において、前記第１の円筒状
真空容器と前記第２の円筒状真空容器の前記ろう付けさ
れる端面をまたいで設けられ、前記第１の円筒状真空容
器の内径の寸法のバラツキに応じて前記第１の円筒状真
空容器の軸方向円筒端部近傍の内面に係止する曲面状断
面を有する第１のリング部と、前記第２の円筒状真空容
器の軸方向円筒端部近傍の内面に係止する円筒状の第２
のリング部とを有するものであって前記第１、第２の円
筒状真空容器とは別の薄肉金属材料で形成され且つ前記
第１、第２の円筒状真空容器の径方向にばね性を有する
リングを備えたことを特徴とする真空スイッチ管。1. A first cylindrical vacuum vessel having an axial end face, and a second cylindrical vacuum vessel having an axial end face brazed to the axial end face of the first cylindrical vacuum vessel. A vacuum switch tube comprising: a first cylindrical vacuum vessel provided across the brazed end faces of the first cylindrical vacuum vessel and the second cylindrical vacuum vessel; and a dimension of an inner diameter of the first cylindrical vacuum vessel. A first ring portion having a curved cross section which is locked to an inner surface near an axial cylindrical end of the first cylindrical vacuum vessel in accordance with the variation of the first cylindrical vacuum vessel, and an axial cylinder of the second cylindrical vacuum vessel A cylindrical second member that locks to the inner surface near the end
And formed of a thin-walled metal material different from the first and second cylindrical vacuum vessels, and having a spring property in the radial direction of the first and second cylindrical vacuum vessels. A vacuum switch tube comprising a ring having
容器の両側に配置され中央部に電極棒が貫通し外周部に
前記第１の円筒状真空容器の端面に当接する突出部を有
する端板であることを特徴とする特許請求の範囲第１項
に記載の真空スイッチ管。2. A second cylindrical vacuum vessel is disposed on both sides of the first cylindrical vacuum vessel, and has a central portion through which an electrode rod penetrates, and an outer peripheral portion which abuts against an end face of the first cylindrical vacuum vessel. The vacuum switch tube according to claim 1, wherein the vacuum switch tube is an end plate having a portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63237106A JP2762480B2 (en) | 1988-09-21 | 1988-09-21 | Vacuum switch tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63237106A JP2762480B2 (en) | 1988-09-21 | 1988-09-21 | Vacuum switch tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0286022A JPH0286022A (en) | 1990-03-27 |
| JP2762480B2 true JP2762480B2 (en) | 1998-06-04 |
Family
ID=17010502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63237106A Expired - Fee Related JP2762480B2 (en) | 1988-09-21 | 1988-09-21 | Vacuum switch tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2762480B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7766855B1 (en) * | 2025-02-21 | 2025-11-10 | 三菱電機株式会社 | Vacuum valve and its manufacturing method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5851429A (en) * | 1981-09-19 | 1983-03-26 | 株式会社明電舎 | Vacuum interrupter |
| JPS58195934U (en) * | 1982-06-23 | 1983-12-26 | 株式会社日立製作所 | Vacuum valve shield |
| JPS6190136U (en) * | 1984-11-19 | 1986-06-12 | ||
| JPS61230221A (en) * | 1985-04-05 | 1986-10-14 | 株式会社日立製作所 | Terminal plate fastening for vacuum valve |
-
1988
- 1988-09-21 JP JP63237106A patent/JP2762480B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0286022A (en) | 1990-03-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |