EP1120803B2 - Vacuum tube for circuit breaker, having a snap-on guide bearing - Google Patents

Vacuum tube for circuit breaker, having a snap-on guide bearing Download PDF

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Publication number
EP1120803B2
EP1120803B2 EP01400156A EP01400156A EP1120803B2 EP 1120803 B2 EP1120803 B2 EP 1120803B2 EP 01400156 A EP01400156 A EP 01400156A EP 01400156 A EP01400156 A EP 01400156A EP 1120803 B2 EP1120803 B2 EP 1120803B2
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EP
European Patent Office
Prior art keywords
tube
cover
flange
tubular
rod
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 - Lifetime
Application number
EP01400156A
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German (de)
French (fr)
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EP1120803B1 (en
EP1120803A1 (en
Inventor
Edgar Spranz
Martin Schlaug
Said Attak
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Grid Solutions SAS
Original Assignee
Areva T&D SAS
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Application filed by Areva T&D SAS filed Critical Areva T&D SAS
Priority to DE60124601T priority Critical patent/DE60124601T3/en
Publication of EP1120803A1 publication Critical patent/EP1120803A1/en
Publication of EP1120803B1 publication Critical patent/EP1120803B1/en
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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
    • 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
    • H01H33/66238—Specific bellows details
    • H01H2033/66246—Details relating to the guiding of the contact rod in vacuum switch belows
    • 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
    • H01H33/66238—Specific bellows details
    • H01H2033/66253—Details relating to the prevention of unwanted rotation of the contact rod in vacuum switch bellows

Definitions

  • the invention relates to a vacuum interrupter for a circuit breaker having an end metal flange which is traversed in leaktight manner by a rod that is movable in axial translation.
  • the rod carries at one end a movable contact in the bulb, and is guided in translation by a guide bearing mounted on the metal flange.
  • a vacuum bulb is known from the document FR-2683940 , and is more particularly intended for a medium voltage circuit breaker.
  • the sealed sliding of the rod through the flange bearing the bearing is obtained by means of a sealed metal bellows disposed inside the bulb. This bellows has at one end a flange welded to the rod, the other end being soldered to the flange by brazing.
  • the guide bearing in translation of the rod is made in part by a plastic bushing which is immobilized in a complementary piece brazed to the flange of the bulb. empty.
  • Locking means for rotating the rod are provided at the contact surface between the rod and the bushing, consisting for example of a longitudinal groove formed in the bore of the bushing and completed by a longitudinal rib formed on the rod. .
  • the bushing is fixed on the complementary part generally by means of a counterplate welded by point or screwed on this part, or by a crimping of the part.
  • the rod is guided by a tubular plastic passage which is fixed to the flange of the vacuum bulb by latching means consisting in particular of circular grooves formed in the bushing, elastic circular lips being fixed to the flange and arranged to fit into the grooves.
  • latching means consisting in particular of circular grooves formed in the bushing, elastic circular lips being fixed to the flange and arranged to fit into the grooves.
  • the assembly provides a longitudinal retention of the bushing to prevent it from being disconnected during the translation of the rod during a circuit breaker maneuver.
  • this construction can have drawbacks in particular in terms of reliability. Indeed, even if they provide a certain longitudinal support, the latching means do not seem arranged to withstand significant extraction efforts. However, such forces can occur in extreme cases of operation where a heating of the vacuum bulb causes an expansion of the rod such that the friction forces with the plastic bushing become important.
  • these latching means are not arranged to provide a maintenance rotation of the bushing. Moreover, it is not expected that the rod is locked in rotation in the bush
  • the object of the invention is to propose a new embodiment of vacuum interrupter for a circuit breaker, with a guide bearing comprising a bushing made of plastic immobilized in a complementary part by latching means which do not have the drawbacks indicated in FIG. -above.
  • DE-A-196 29 204 discloses a vacuum interrupter whose hood and the rod support bushing are joined by a latching system different from the latter of the invention.
  • the subject of the invention is a vacuum interrupter for a circuit breaker defined by the claims.
  • this snap fastening it avoids the risk of deterioration of the vacuum bulb on the one hand during assembly of the guide bearing of the rod, on the other hand when tightening a threaded element at the end of the stem outside the bulb.
  • this construction contributes to reducing the installation time of the vacuum interrupter and therefore the cost of producing a vacuum interrupter circuit breaker.
  • the metal cap is attached pressed against the flange on the outside of the bulb and has lights accessible to unclamping means for insertion into said lights to press the elastic tabs of the tubular bushing, in order to be able to remove said bushing for recycling.
  • the tubular bushing has a first tubular portion surrounded by a second coaxial tubular portion of shorter length, these two tubular portions being integrally connected by a third coaxial tubular portion. of shorter length than the second tubular portion, so as to provide an annular space between said first and second tubular portions.
  • the vacuum interrupter 1 of a circuit breaker comprises an insulating tubular casing 2, for example ceramic, which extends in the axial direction A and two end metal plates or flanges 3,4.
  • the casing 2 is generally of cylindrical shape, in which case at least the flange 4 is a disc having a coaxial circular orifice.
  • To the flange 3 is fixed a fixed rod not shown carrying a fixed contact.
  • the vacuum bottle 1 comprises a movable contact 5 'carried by a metal rod 5 which slides sealingly through the orifice 11 of the flange 4 by means of a metal bellows 7 mounted inside the casing 2.
  • a bearing 8 consisting of a tubular metal cap 9 and a tubular penetration 10 of insulating material which is intended to be inserted coaxially into the cover 9 and snapped into it.
  • the two elements 9 and 10 of the bearing are shown only in axial half section.
  • the cover 9 and the bellows 7 are soldered by brazing to the flange 4 coaxially with the rod 5.
  • the bushing 10 is fitted into the rod 5 and snapped into the cover 9 by passing through the orifice of the flange 4.
  • rod 5 can then slide inside the bushing 10 so as to move in axial translation the movable contact 5 'during operation of the circuit breaker.
  • the figure 2 shows in more detail the tubular metal cap 9.
  • This is made for example from a pressed sheet metal thin and has an end forming an inner flange 9A.
  • the outer surface of this flange 9A is soldered by brazing on the flange 4 of the vacuum bulb.
  • the cover 9 has on its cylindrical inner periphery in the vicinity of its other end, recesses in the form here of radial lights 9B, preferably equidistantly distributed and bosses 9C distributed between the slots 9B.
  • the lights 9B can be made by punching, and the bosses 9C can be made by pushing towards the inside of the cover.
  • the lights 9B can also be replaced by grooves.
  • the figure 3 shows in greater detail the tubular insulating bushing 10.
  • This is preferably made of an injected plastic material. It comprises a first cylindrical tubular portion 10A whose outer diameter is adjusted with the inside diameter of the cover 9 and which is intended to be inserted coaxially inside the metal cap 9, and a second cylindrical tubular portion 10B coaxial in part 10A, smaller diameter and longer length. These two tubular parts are interconnected by a third tubular portion 10J in a zone forming the base of the bushing. This tubular portion 10J is shorter longitudinally than the first tubular portion 10A, so as to provide an annular space 10L between the first and second portions.
  • Part 10B is intended to be inserted coaxially into the orifice 9D delimited by the flange 9A of the cover and in the orifice 11 formed in the flange 4 of the vacuum bottle.
  • the shoulder 10C between the tubular portions 10A and 10B formed by the end of the cylindrical portion 10A is intended to bear on the inner surface of the collar 9A of the cover 9 when the bushing is inserted into the cover.
  • the tubular portion 10A has on its cylindrical outer periphery resilient tongues 10D distributed preferably equidistantly.
  • Each tongue extends axially in alignment with the openings 9B of the cover and carries at its free end a lip which protrudes radially and which is intended to snap into a slot 9B of the cover 9 when the penetration 10 is inserted coaxially in the 9.
  • This clipping of the tabs 10D in the slots 9B thus ensures the immobilization in the axial direction A of the bushing 10 in the cover 9.
  • the snapping of the tabs 10D in the slots 9B can be achieved without mechanical effort on the hood 9 thanks to chamfering lip tabs.
  • the bracing tongues can withstand the large extraction forces that can occur in extreme cases of operation of the circuit breaker comprising a vacuum interrupter according to the invention.
  • the bushing 10 is locked in rotation relative to the flange 4 and therefore relative to the cover 9.
  • the tabs 10D alone do not allow to withstand a large torque that would be exerted on the crossing 10 by the rod 5.
  • the tubular portion 10A also has on its cylindrical outer periphery recesses 10 E which are distributed between the tabs 10D in alignment with the bosses 9C of the cover, so that the bosses 9C are embedded. in the recesses 10 E when the penetration 10 is inserted into the cover 9.
  • the bosses 9C and the recesses 10E are adjusted to prevent any possibility of relative rotation with respect to the axis A of the passage 10 in the cover 9, so as not to damage the metal bellows 7.
  • the tubular portions 10A and 10B of the bushing preferably form a single molded piece and the tubular portion 10B has an internal bore 10F in which the rod 5 slides.
  • the bore 10F has one or two flats 10G consisting of a wide longitudinal groove. , with another longitudinal groove 10H deeper which serves as a ventilation channel as is already known.
  • the flats 10G or are used to prevent rotation of the rod 5 in the bushing.
  • FIG 4 are schematically represented in longitudinal section a flange 4 on which is welded a bearing in a vacuum bottle according to the invention.
  • the crossing 10 of the bearing is shown in partial projection.
  • the metal sealing bellows 7 has an end which terminates in a tubular portion which passes through the orifice 11 formed in the flange 4 and the orifice of the cover 9 of the bearing.
  • the cover 9 and the bellows 7 are welded to the flange 4 by soldering in the oven, preferably in a single pass after the last furnace brazing operation of the vacuum bulb.
  • the bellows 7 is advantageously welded to the inside edge of the opening of the cover 9.
  • the end of the bellows 7 is inserted into the opening of the cover 9 to protrude below the inner collar of said hood. This makes it possible to verify with the eye that the bellows is inserted into the orifice 11 of the flange 4, after the last oven-baking operation.
  • the annular space 10L of the bushing 10 is arranged so that the end of the bellows 7 can be housed in said space without pressing against the bushing 10 after latching thereof.
  • FIG 5 is schematically shown in perspective another embodiment of the bearing of the vacuum bottle according to the invention, in exploded view with the end of the bulb on which this bearing must be mounted. Only part of the rod 5 is shown, surrounded by the bellows 7.
  • the cover 9 of the bearing is identical to that shown in FIG. figure 2 , while the insulating tubular bushing 10 differs somewhat in shape from that shown in FIG. figure 3 .
  • the first tubular portion 10B of the bushing 10 is here contiguous against the second coaxial tubular portion 10A and of shorter length.
  • the two parts 10A and 10B preferably form a single molded piece, but the crossing 10 here has a massive shape.
  • the simplification of the shape of this crossing is made possible by the fact that in this embodiment of the vacuum bottle, the end of the bellows 7 does not pass through the orifice 11 of the flange 4 but is positioned in a circular groove provided for this purpose at the inner surface of said flange, before brazing in the oven.
  • the crossing 10 has an annular space between its two tubular parts in this embodiment.
  • the diameter D 'of the orifice 9D of the collar 9A of the cover 9 can then be equal to or only slightly greater than the outside diameter D of the tubular portion 10B of the bushing 10.
  • the bearing in a vacuum interrupter according to the invention contributes to reducing the installation time of the vacuum interrupter and therefore of a vacuum interrupter circuit breaker.
  • This snap-in also makes it possible to avoid significant mechanical stresses on the bulb during the assembly of the insulating bushing of the bearing, as well as during assembly of the device for actuating the rod of the moving contact of the bulb.

Landscapes

  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Insulating Bodies (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)

Abstract

The mounted snap fit section forms the end section of a metallic tube. The snap fit section (10) has a sealed inserted sliding rod sliding in the section. The snap fit section has a female part mounted in the tube end and the male section with elastic protruding ends (10D) snapping into position. A groove (10G) prevents rod rotation, and there is an extra insertable section (10E) to assist rotation movement prevention.

Description

L'invention porte sur une ampoule à vide pour disjoncteur, ayant un flasque métallique d'extrémité qui est traversé de manière étanche par une tige mobile en translation axiale. La tige porte à une extrémité un contact mobile dans l'ampoule, et est guidée en translation par un palier de guidage monté sur le flasque métallique. Une telle ampoule à vide est connue du document FR-2683940 , et est plus particulièrement destinée à un disjoncteur moyenne tension. Dans ce type d'ampoule à vide, le coulissement étanche de la tige à travers le flasque portant le palier est obtenu grâce à un soufflet métallique étanche disposé à l'intérieur de l'ampoule. Ce soufflet comporte à une extrémité une collerette soudée à la tige, l'autre extrémité étant soudée au flasque par brasage. Il est nécessaire de guider en translation la tige de façon très précise, et de prévoir des moyens de blocage en rotation de la tige par rapport au flasque afin de ne pas détériorer le soufflet métallique. En particulier, quand un élément fileté rapporté dans le taraudage situé à l'extrémité de la tige est serré, il est important que le couple de serrage exercé ne provoque pas la rotation de la tige.The invention relates to a vacuum interrupter for a circuit breaker having an end metal flange which is traversed in leaktight manner by a rod that is movable in axial translation. The rod carries at one end a movable contact in the bulb, and is guided in translation by a guide bearing mounted on the metal flange. Such a vacuum bulb is known from the document FR-2683940 , and is more particularly intended for a medium voltage circuit breaker. In this type of vacuum bulb, the sealed sliding of the rod through the flange bearing the bearing is obtained by means of a sealed metal bellows disposed inside the bulb. This bellows has at one end a flange welded to the rod, the other end being soldered to the flange by brazing. It is necessary to guide the rod in translation very precisely, and to provide locking means in rotation of the rod relative to the flange so as not to damage the metal bellows. In particular, when a threaded member reported in the tapping at the end of the rod is tightened, it is important that the torque exerted does not cause rotation of the rod.

Dans des constructions d'ampoules à vide connues pour des disjoncteurs à moyenne tension, le palier de guidage en translation de la tige est réalisé en partie par une traversée en matière plastique qui est immobilisée dans une pièce complémentaire brasée sur le flasque de l'ampoule à vide. Des moyens de blocage en rotation de la tige sont prévus au niveau de la surface de contact entre la tige et la traversée, consistant par exemple en une cannelure longitudinale pratiquée dans l'alésage de la traversée et complétée par une nervure longitudinale ménagé sur la tige. La traversée est fixée sur la pièce complémentaire généralement par l'intermédiaire d'une contreplaque soudée par point ou vissée sur cette pièce, ou encore par un sertissage de la pièce. Ces techniques présentent toutes un inconvénient. Le soudage par point d'une contreplaque nécessite une pièce complémentaire suffisamment épaisse pour ne pas risquer de percer l'enveloppe de l'ampoule à vide lors du soudage. De la même façon, le vissage d'une contreplaque nécessite de réaliser des trous borgnes filetés dans la pièce complémentaire qui doit en conséquence avoir une forte épaisseur. Le sertissage de la pièce complémentaire met quant à lui en jeu des efforts mécaniques importants pouvant conduire à la détérioration de la brasure de la pièce complémentaire sur le flasque de l'ampoule à vide.In known vacuum bulb constructions for medium voltage circuit breakers, the guide bearing in translation of the rod is made in part by a plastic bushing which is immobilized in a complementary piece brazed to the flange of the bulb. empty. Locking means for rotating the rod are provided at the contact surface between the rod and the bushing, consisting for example of a longitudinal groove formed in the bore of the bushing and completed by a longitudinal rib formed on the rod. . The bushing is fixed on the complementary part generally by means of a counterplate welded by point or screwed on this part, or by a crimping of the part. These techniques all have a disadvantage. Spot welding of a counter plate requires a sufficiently thick complementary part to avoid piercing the envelope of the vacuum bulb during welding. In the same way, the screwing of a counterplate requires making threaded blind holes in the complementary piece which must consequently have a large thickness. The crimping of the complementary piece puts into play significant mechanical forces that can lead to the deterioration of the brazing of the complementary piece on the flange of the vacuum bulb.

Dans une autre construction connue du brevet DE 2440827 , la tige est guidée par une traversée tubulaire en matière plastique qui est fixée au flasque de l'ampoule à vide par des moyens d'encliquetage consistant notamment en des rainures circulaires pratiquées dans la traversée, des lèvres circulaires élastiques étant fixées sur le flasque et agencées pour venir s'insérer dans les rainures. L'ensemble procure un maintien longitudinal de la traversée pour éviter que celle-ci ne se déboite pendant la translation de la tige lors d'une manoeuvre du disjoncteur. Toutefois, cette construction peut présenter des inconvénients notamment en terme de fiabilité. En effet, même s'ils procurent un certain maintien longitudinal, les moyens d'encliquetage ne semblent pas agencés pour pouvoir résister à des efforts d'extraction importants. Or, de tels efforts peuvent se produire dans des cas extrêmes de fonctionnement où un échauffement de l'ampoule à vide provoque une dilatation de la tige telle que les forces de frottement avec la traversée plastique deviennent importantes. D'autre part, ces moyens d'encliquetage ne sont pas agencés pour procurer un maintien en rotation de la traversée. Du reste, il n'est pas prévu que la tige soit bloquée en rotation dans la traversée.In another known construction of the DE 2440827 , the rod is guided by a tubular plastic passage which is fixed to the flange of the vacuum bulb by latching means consisting in particular of circular grooves formed in the bushing, elastic circular lips being fixed to the flange and arranged to fit into the grooves. The assembly provides a longitudinal retention of the bushing to prevent it from being disconnected during the translation of the rod during a circuit breaker maneuver. However, this construction can have drawbacks in particular in terms of reliability. Indeed, even if they provide a certain longitudinal support, the latching means do not seem arranged to withstand significant extraction efforts. However, such forces can occur in extreme cases of operation where a heating of the vacuum bulb causes an expansion of the rod such that the friction forces with the plastic bushing become important. On the other hand, these latching means are not arranged to provide a maintenance rotation of the bushing. Moreover, it is not expected that the rod is locked in rotation in the bushing.

Le but de l'invention est de proposer une nouvelle réalisation d'ampoule à vide pour disjoncteur, avec un palier de guidage comprennant une traversée en matière plastique immobilisée dans une pièce complémentaire par des moyens d'encliquetage qui ne présentent pas les inconvénients indiqués ci-dessus. DE-A-196 29 204 décrit une ampoule à vide dont le capot et la traversée de support de la tige sont unis par un système d'encliquetage différent de celui-ci de l'invention.The object of the invention is to propose a new embodiment of vacuum interrupter for a circuit breaker, with a guide bearing comprising a bushing made of plastic immobilized in a complementary part by latching means which do not have the drawbacks indicated in FIG. -above. DE-A-196 29 204 discloses a vacuum interrupter whose hood and the rod support bushing are joined by a latching system different from the latter of the invention.

A cet effet, l'invention a pour objet une ampoule à vide pour disjoncteur, définie par les revendications.
Avec cette fixation par encliquetage, on évite les risques de détérioration de l'ampoule à vide d'une part lors du montage du palier de guidage de la tige, d'autre part lors du serrage d'un élément fileté à l'extrémité de la tige extérieure à l'ampoule. En outre, cette construction contribue à réduire le temps de montage de l'ampoule à vide et donc le coût de réalisation d'un disjoncteur à ampoule à vide.
Dans un mode de réalisation préféré de l'ampoule à vide selon l'invention, le capot métallique est fixé accolé contre le flasque à l'extérieur de l'ampoule et présente des lumières accessibles à des moyens de décliquetage destinés à s'insérer dans lesdites lumières pour appuyer sur les languettes élastiques de la traversée tubulaire, afin de pouvoir retirer ladite traversée pour son recyclage.For this purpose, the subject of the invention is a vacuum interrupter for a circuit breaker defined by the claims.
With this snap fastening, it avoids the risk of deterioration of the vacuum bulb on the one hand during assembly of the guide bearing of the rod, on the other hand when tightening a threaded element at the end of the stem outside the bulb. In addition, this construction contributes to reducing the installation time of the vacuum interrupter and therefore the cost of producing a vacuum interrupter circuit breaker.
In a preferred embodiment of the vacuum interrupter according to the invention, the metal cap is attached pressed against the flange on the outside of the bulb and has lights accessible to unclamping means for insertion into said lights to press the elastic tabs of the tubular bushing, in order to be able to remove said bushing for recycling.

Dans un autre mode de réalisation préféré de l'ampoule à vide selon l'invention, la traversée tubulaire présente une première partie tubulaire entourée par une seconde partie tubulaire coaxiale de moindre longueur, ces deux parties tubulaires étant solidairement reliées par une troisième partie tubulaire coaxiale de moindre longueur que la seconde partie tubulaire, de façon à ménager un espace annulaire entre lesdites première et seconde parties tubulaires.In another preferred embodiment of the vacuum bottle according to the invention, the tubular bushing has a first tubular portion surrounded by a second coaxial tubular portion of shorter length, these two tubular portions being integrally connected by a third coaxial tubular portion. of shorter length than the second tubular portion, so as to provide an annular space between said first and second tubular portions.

D'autres caractéristiques et avantages de l'invention apparaîtront encore à la lecture de la description qui suit d'un exemple de réalisation d'une ampoule à vide pour disjoncteur selon l'invention illustrée par les dessins.

  • La figure 1 est une représentation schématique en coupe longitudinale d'une ampoule à vide d'un disjoncteur moyenne tension.
  • La figure 2 est une vue en perspective du capot du palier de l'ampoule à vide selon l'invention.
  • La figure 3 est une vue en perspective d'une réalisation préférée de la traversée du palier de l'ampoule à vide selon l'invention.
  • La figure 4 est une représentation schématique en coupe longitudinale et projection du palier de l'ampoule à vide constitué des éléments représentés aux figures 2 et 3, une fois ce palier installé sur l'ampoule.
  • La figure 5 est une représentation schématique en perspective d'un autre mode de réalisation de la traversée du palier de l'ampoule à vide selon l'invention.
Other features and advantages of the invention will become apparent on reading the following description of an exemplary embodiment of a vacuum interrupter lamp according to the invention illustrated by the drawings.
  • The figure 1 is a schematic representation in longitudinal section of a vacuum interrupter of a medium voltage circuit breaker.
  • The figure 2 is a perspective view of the bearing cover of the vacuum bulb according to the invention.
  • The figure 3 is a perspective view of a preferred embodiment of the crossing of the bearing of the vacuum bottle according to the invention.
  • The figure 4 is a schematic representation in longitudinal section and projection of the bearing of the vacuum interrupter constituted by the elements represented in Figures 2 and 3 , once this landing installed on the bulb.
  • The figure 5 is a schematic representation in perspective of another embodiment of the crossing of the bearing of the vacuum bottle according to the invention.

Sur la figure 1, l'ampoule à vide 1 d'un disjoncteur comprend une enveloppe tubulaire isolante 2, par exemple en céramique, qui s'étend suivant la direction axiale A et deux plaques métalliques d'extrémité ou flasques 3,4. L'enveloppe 2 est généralement de forme cylindrique, auquel cas au moins le flasque 4 est un disque présentant un orifice circulaire coaxial. Au flasque 3 est fixée une tige fixe non représentée portant un contact fixe. L'ampoule à vide 1 comporte un contact mobile 5' porté par une tige métallique 5 qui coulisse de manière étanche à travers l'orifice 11 du flasque 4 grâce à un soufflet métallique 7 monté à l'intérieur de l'enveloppe 2. La tige 5 est guidée en translation suivant la direction axiale A par un palier 8 constitué par un capot métallique tubulaire 9 et par une traversée tubulaire 10 en matière isolante qui est destinée à être insérée coaxialement dans le capot 9 et encliquetée dans celui-ci. Sur la figure 1, les deux éléments 9 et 10 du palier sont montrés seulement en demi-coupe axiale. Le capot 9 ainsi que le soufflet 7 sont soudés par brasage au four au flasque 4 coaxialement à la tige 5. Ensuite, la traversée 10 est emmanchée dans la tige 5 et encliquetée dans le capot 9 en traversant l'orifice du flasque 4. La tige 5 peut alors coulisser à l'intérieur de la traversée 10 de façon à déplacer en translation axiale le contact mobile 5' lors d'une manoeuvre du disjoncteur.On the figure 1 , the vacuum interrupter 1 of a circuit breaker comprises an insulating tubular casing 2, for example ceramic, which extends in the axial direction A and two end metal plates or flanges 3,4. The casing 2 is generally of cylindrical shape, in which case at least the flange 4 is a disc having a coaxial circular orifice. To the flange 3 is fixed a fixed rod not shown carrying a fixed contact. The vacuum bottle 1 comprises a movable contact 5 'carried by a metal rod 5 which slides sealingly through the orifice 11 of the flange 4 by means of a metal bellows 7 mounted inside the casing 2. 5 is guided in translation in the axial direction A by a bearing 8 consisting of a tubular metal cap 9 and a tubular penetration 10 of insulating material which is intended to be inserted coaxially into the cover 9 and snapped into it. On the figure 1 the two elements 9 and 10 of the bearing are shown only in axial half section. The cover 9 and the bellows 7 are soldered by brazing to the flange 4 coaxially with the rod 5. Then, the bushing 10 is fitted into the rod 5 and snapped into the cover 9 by passing through the orifice of the flange 4. rod 5 can then slide inside the bushing 10 so as to move in axial translation the movable contact 5 'during operation of the circuit breaker.

La figure 2 montre plus en détail le capot métallique tubulaire 9. Celui-ci est réalisé par exemple à partir d'une tôle emboutie de faible épaisseur et comporte une extrémité formant une collerette intérieure 9A. La surface extérieure de cette collerette 9A est soudée par brasage au four sur le flasque 4 de l'ampoule à vide. Le capot 9 présente sur sa périphérie intérieure cylindrique au voisinage de son autre extrémité, des évidements sous la forme ici de lumières radiales 9B, de préférence réparties de façon équidistante et des bossages 9C répartis entre les lumières 9B. Les lumières 9B peuvent être réalisées par poinçonnage, et les bossages 9C peuvent être réalisés par repoussage vers l'intérieur du capot. Les lumières 9B peuvent aussi être remplacées par des rainures.The figure 2 shows in more detail the tubular metal cap 9. This is made for example from a pressed sheet metal thin and has an end forming an inner flange 9A. The outer surface of this flange 9A is soldered by brazing on the flange 4 of the vacuum bulb. The cover 9 has on its cylindrical inner periphery in the vicinity of its other end, recesses in the form here of radial lights 9B, preferably equidistantly distributed and bosses 9C distributed between the slots 9B. The lights 9B can be made by punching, and the bosses 9C can be made by pushing towards the inside of the cover. The lights 9B can also be replaced by grooves.

La figure 3 montre plus en détail la traversée isolante tubulaire 10. Celle-ci est réalisée de préférence en une matière plastique injectée. Elle comporte une première partie tubulaire cylindrique 10A dont le diamètre extérieur est ajusté avec le diamètre intérieur du capot 9 et qui est destinée à venir s'insérer coaxialement à l'intérieur du capot métallique 9, ainsi qu'une seconde partie tubulaire cylindrique 10B coaxiale à la partie 10A, de plus petit diamètre et de longueur supérieure. Ces deux parties tubulaires sont reliées entre elles par une troisième partie tubulaire 10J dans une zone formant la base de la traversée. Cette partie tubulaire 10J est plus courte longitudinalement que la première partie tubulaire 10A, de façon à ménager un espace annulaire 10L entre les premières et seconde parties. La partie 10B est destiné à s'insérer coaxialement dans l'orifice 9D délimité par la collerette 9A du capot et dans l'orifice 11 ménagé dans le flasque 4 de l'ampoule à vide. L'épaulement 10C entre les parties tubulaires 10A et 10B formé par l'extrémité de la partie cylindrique 10A est destiné à venir en appui sur la surface intérieure de la collerette 9A du capot 9 quand la traversée est insérée dans le capot.
La partie tubulaire 10A présente sur sa périphérie extérieure cylindrique des languettes élastiques 10D réparties de préférence de façon équidistante. Chaque languette s'étend axialement en alignement avec les lumières 9B du capot et porte à son extrémité libre une lèvre qui saille radialement et qui est destinée à venir s'encliqueter dans une lumière 9B du capot 9 quand la traversée 10 est insérée coaxialement dans le capot 9. Cet encliquetage des languettes 10D dans les lumières 9B assure ainsi l'immobilisation selon la direction axiale A de la traversée 10 dans le capot 9. L'encliquetage des languettes 10D dans les lumières 9B peut être réalisé sans effort mécanique sur le capot 9 grâce à un chanfreinage de la lèvre des languettes. Lorsque la lèvre d'une languette 10D est engagée dans une lumière 9B, la languette s'arc-boute contre un bord de la lumière pour résister à un effort d'extraction de la traversée 10 du capot 9. L'arc-boutement des languettes permet de résister aux efforts d'extraction importants qui peuvent se produire dans des cas extrêmes de fonctionnement du disjoncteur comportant une ampoule à vide selon l'invention. Comme expliqué précédemment, il est essentiel dans l'invention que la traversée 10 soit bloquée en rotation par rapport au flasque 4 et donc par rapport au capot 9. Or, les languettes 10D ne permettent pas à elles seules de résister à un couple important qui serait exercé sur la traversée 10 par la tige 5.
Afin de procurer un blocage en rotation efficace, la partie tubulaire 10A comporte également sur sa périphérie extérieure cylindrique des renfoncements 10 E qui sont répartis entre les languettes 10D en alignement avec les bossages 9C du capot, de sorte que les bossages 9C viennent s'encastrer dans les renfoncements 10 E quand la traversée 10 est insérée dans le capot 9. Les bossages 9C et les renfoncements 10 E sont ajustés pour empêcher toute possibilité de rotation relative par rapport à l'axe A de la traversée 10 dans le capot 9, de façon à ne pas détériorer le soufflet métallique 7.
Les parties tubulaires 10A et 10B de la traversée forment préférablement une seule pièce venue de moulage et la partie tubulaire 10B comporte un alésage intérieur 10F dans lequel coulisse la tige 5. L'alésage 10F présente un ou deux méplats 10G consistant en une large rainure longitudinale, avec une autre rainure longitudinale 10H plus profonde qui sert de canal de ventilation comme cela est déjà connu. Le ou les méplats 10G servent à éviter une rotation de la tige 5 dans la traversée.The figure 3 shows in greater detail the tubular insulating bushing 10. This is preferably made of an injected plastic material. It comprises a first cylindrical tubular portion 10A whose outer diameter is adjusted with the inside diameter of the cover 9 and which is intended to be inserted coaxially inside the metal cap 9, and a second cylindrical tubular portion 10B coaxial in part 10A, smaller diameter and longer length. These two tubular parts are interconnected by a third tubular portion 10J in a zone forming the base of the bushing. This tubular portion 10J is shorter longitudinally than the first tubular portion 10A, so as to provide an annular space 10L between the first and second portions. Part 10B is intended to be inserted coaxially into the orifice 9D delimited by the flange 9A of the cover and in the orifice 11 formed in the flange 4 of the vacuum bottle. The shoulder 10C between the tubular portions 10A and 10B formed by the end of the cylindrical portion 10A is intended to bear on the inner surface of the collar 9A of the cover 9 when the bushing is inserted into the cover.
The tubular portion 10A has on its cylindrical outer periphery resilient tongues 10D distributed preferably equidistantly. Each tongue extends axially in alignment with the openings 9B of the cover and carries at its free end a lip which protrudes radially and which is intended to snap into a slot 9B of the cover 9 when the penetration 10 is inserted coaxially in the 9. This clipping of the tabs 10D in the slots 9B thus ensures the immobilization in the axial direction A of the bushing 10 in the cover 9. The snapping of the tabs 10D in the slots 9B can be achieved without mechanical effort on the hood 9 thanks to chamfering lip tabs. When the lip of a tongue 10D is engaged in a light 9B, the tongue is arched against an edge of the light to withstand an extraction force of the passage 10 of the cover 9. The bracing tongues can withstand the large extraction forces that can occur in extreme cases of operation of the circuit breaker comprising a vacuum interrupter according to the invention. As explained above, it is essential in the invention that the bushing 10 is locked in rotation relative to the flange 4 and therefore relative to the cover 9. However, the tabs 10D alone do not allow to withstand a large torque that would be exerted on the crossing 10 by the rod 5.
In order to provide an effective locking rotation, the tubular portion 10A also has on its cylindrical outer periphery recesses 10 E which are distributed between the tabs 10D in alignment with the bosses 9C of the cover, so that the bosses 9C are embedded. in the recesses 10 E when the penetration 10 is inserted into the cover 9. The bosses 9C and the recesses 10E are adjusted to prevent any possibility of relative rotation with respect to the axis A of the passage 10 in the cover 9, so as not to damage the metal bellows 7.
The tubular portions 10A and 10B of the bushing preferably form a single molded piece and the tubular portion 10B has an internal bore 10F in which the rod 5 slides. The bore 10F has one or two flats 10G consisting of a wide longitudinal groove. , with another longitudinal groove 10H deeper which serves as a ventilation channel as is already known. The flats 10G or are used to prevent rotation of the rod 5 in the bushing.

En figure 4 sont représentés schématiquement en coupe longitudinale un flasque 4 sur lequel est soudé un palier dans une ampoule à vide selon l'invention. La traversée 10 du palier est représentée en projection partielle. Le soufflet métallique d'étanchéité 7 présente une extrémité qui se termine par une partie tubulaire qui traverse l'orifice 11 ménagé dans le flasque 4 ainsi que l'orifice du capot 9 du palier. Le capot 9 ainsi que que soufflet 7 sont soudés au flasque 4 par brasage au four, préférablement en une seule passe après la dernière opération de brasage au four de l'ampoule à vide. En outre, pendant cette passe unique, le soufflet 7 est avantageusement soudé au bord intérieur de l'orifice du capot 9. Dans le mode de réalisation préféré représenté, l'extrémité du soufflet 7 est insérée dans l'orifice du capot 9 pour dépasser en deçà de la collerette intérieure dudit capot. Ceci permet de vérifier à l'oeil que le soufflet est bien inséré dans l'orifice 11 du flasque 4, après la dernière opération de brasage au four. L'espace annulaire 10L de la traversée 10 est agencé pour que l'extrémité du soufflet 7 puisse se loger dans ledit espace sans appuyer contre la traversée 10 après l'encliquetage de celle-ci.In figure 4 are schematically represented in longitudinal section a flange 4 on which is welded a bearing in a vacuum bottle according to the invention. The crossing 10 of the bearing is shown in partial projection. The metal sealing bellows 7 has an end which terminates in a tubular portion which passes through the orifice 11 formed in the flange 4 and the orifice of the cover 9 of the bearing. The cover 9 and the bellows 7 are welded to the flange 4 by soldering in the oven, preferably in a single pass after the last furnace brazing operation of the vacuum bulb. In addition, during this single pass, the bellows 7 is advantageously welded to the inside edge of the opening of the cover 9. In the preferred embodiment shown, the end of the bellows 7 is inserted into the opening of the cover 9 to protrude below the inner collar of said hood. This makes it possible to verify with the eye that the bellows is inserted into the orifice 11 of the flange 4, after the last oven-baking operation. The annular space 10L of the bushing 10 is arranged so that the end of the bellows 7 can be housed in said space without pressing against the bushing 10 after latching thereof.

En figure 5 est représenté schématiquement en perspective un autre mode de réalisation du palier de l'ampoule à vide selon l'invention, en vue éclatée avec l'extrémité de l'ampoule sur laquelle ce palier doit être monté. Seule une partie de la tige 5 est représentée, entourée par le soufflet 7. Le capot 9 du palier est identique à celui représenté à la figure 2, tandis que la traversée tubulaire isolante 10 diffère quelque peu par sa forme de celle représentée à la figure 3. La première partie tubulaire 10B de la traversée 10 est ici accolée contre la seconde partie tubulaire 10A coaxiale et de moindre longueur. De même que dans la réalisation précédente, les deux parties 10A et 10B forment préférablement une seule pièce venue de moulage, mais la traversée 10 présente ici une forme massive. La simplification de la forme de cette traversée est rendue possible par le fait que dans ce mode de réalisation de l'ampoule à vide, l'extrémité du soufflet 7 ne traverse pas l'orifice 11 du flasque 4 mais est positionnée dans une rainure circulaire ménagée à cet effet au niveau de la surface interne dudit flasque, avant le brasage au four. Ainsi, il n'est pas nécessaire que la traversée 10 présente un espace annulaire entre ses deux parties tubulaires dans cette réalisation. Le diamètre D' de l'orifice 9D de la collerette 9A du capot 9 peut alors être égal ou à peine supérieur au diamètre extérieur D de la partie tubulaire 10B de la traversée 10.In figure 5 is schematically shown in perspective another embodiment of the bearing of the vacuum bottle according to the invention, in exploded view with the end of the bulb on which this bearing must be mounted. Only part of the rod 5 is shown, surrounded by the bellows 7. The cover 9 of the bearing is identical to that shown in FIG. figure 2 , while the insulating tubular bushing 10 differs somewhat in shape from that shown in FIG. figure 3 . The first tubular portion 10B of the bushing 10 is here contiguous against the second coaxial tubular portion 10A and of shorter length. As in the previous embodiment, the two parts 10A and 10B preferably form a single molded piece, but the crossing 10 here has a massive shape. The simplification of the shape of this crossing is made possible by the fact that in this embodiment of the vacuum bottle, the end of the bellows 7 does not pass through the orifice 11 of the flange 4 but is positioned in a circular groove provided for this purpose at the inner surface of said flange, before brazing in the oven. Thus, it is not necessary that the crossing 10 has an annular space between its two tubular parts in this embodiment. The diameter D 'of the orifice 9D of the collar 9A of the cover 9 can then be equal to or only slightly greater than the outside diameter D of the tubular portion 10B of the bushing 10.

Le palier dans une ampoule à vide selon l'invention, réalisé par un encliquetage de deux pièces complémentaires, contribue à réduire le temps de montage de l'ampoule à vide et donc d'un disjoncteur à ampoule à vide. Cet encliquetage permet également d'éviter les contraintes mécaniques importantes sur l'ampoule lors du montage de la traversée isolante du palier, ainsi que lors du montage du dispositif de manoeuvre de la tige du contact mobile de l'ampoule.The bearing in a vacuum interrupter according to the invention, achieved by a snap of two complementary parts, contributes to reducing the installation time of the vacuum interrupter and therefore of a vacuum interrupter circuit breaker. This snap-in also makes it possible to avoid significant mechanical stresses on the bulb during the assembly of the insulating bushing of the bearing, as well as during assembly of the device for actuating the rod of the moving contact of the bulb.

Claims (6)

  1. A vacuum tube for a circuit breaker, having a metal end flange (4) through which an axially translationally movable rod (5) sealingly passes, said flange (4) carrying a bearing translationally guiding the rod consisting of a metal cover (9) attached to the flange and by a through tube (10) of insulating material wherein said rod (5) is slidable, means (log) arranged to prevent the rotation of said rod (5) in the through tube, the cover including on the inner periphery thereof bosses (9C) for being inserted in indentations (10C) having a complementary shape provided on the outer periphery of the through tube in order to prevent any rotational movement of the through tube after snapping; said through tube (10) comprising snapping means to be inserted and maintained in the cover coaxially, said snapping means comprising elastic tabs (10D) provided on the outer periphery of said through tube (10), characterised in that the elastic tabs comprise an axially extending part and a radially outwardly projecting free end part, are carried by a part (10A) of the through tube (10) inserted inside the cover (9), and penetrate recesses or ports (9B) provided on the inner tubular periphery of said cover (9), and in that each elastic tab is braceable against an edge of a port (9B) once the through tube (10) is snapped into the cover (9) so as to resist any extracting strain of the through tube.
  2. The vacuum tube according to claim 1, wherein the cover (9) is adjoining the flange (4) outside the tube and has ports (9B) accessible to dissnapping means for being inserted in said ports to press on the elastic tabs (10D), to allow the through tube (10) to be removed for the recycling thereof.
  3. The vacuum tube according to one of claims 1 and 2, wherein the insulation through tube (10) has a first tubular part (10A) which surrounds a second tubular part (10B) which is coaxial and of higher length, both parts being integrally connected by a third coaxial tubular part (10J) of lesser length than the first tubular part (10A), so as to provide an annular space (10L) between said first and second tubular parts.
  4. The vacuum tube according to claim 3, wherein an end of the bellows (7) terminates in a tubular part which passes through the hole (11) provided in the flange (4) as well as the hole (9D) of the cover (9), and wherein said annular space (10L) of said through tube (10) is arranged so that said end of the bellows (7) can be accommodated in said space without pressing on the through tube (10) after the latter is snapped.
  5. The vacuum tube according to one of claims 1 to 2, wherein the insulation tubular through tube (10) has a first tubular part (10B) adjoining a second coaxial tubular part (10A) of lesser length which surrounds it such that said through tube (10) has a bulky form.
  6. The vacuum tube according to any of claims 1 to 5, wherein the through tube (10) is made of an injected plastic material and the cover (9) is a drawn metal plate.
EP01400156A 2000-01-25 2001-01-19 Vacuum tube for circuit breaker, having a snap-on guide bearing Expired - Lifetime EP1120803B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE60124601T DE60124601T3 (en) 2000-01-25 2001-01-19 Vacuum tube for circuit breaker, with snap-mounted guide bearing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0000907 2000-01-25
FR0000907A FR2804241B1 (en) 2000-01-25 2000-01-25 VACUUM BULB FOR CIRCUIT BREAKER HAVING LOCKING MOUNTED BEARING

Publications (3)

Publication Number Publication Date
EP1120803A1 EP1120803A1 (en) 2001-08-01
EP1120803B1 EP1120803B1 (en) 2006-11-22
EP1120803B2 true EP1120803B2 (en) 2012-07-11

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EP01400156A Expired - Lifetime EP1120803B2 (en) 2000-01-25 2001-01-19 Vacuum tube for circuit breaker, having a snap-on guide bearing

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EP (1) EP1120803B2 (en)
AT (1) ATE346371T1 (en)
DE (1) DE60124601T3 (en)
FR (1) FR2804241B1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305169B4 (en) * 2003-01-31 2005-01-27 Siemens Ag Arrangement with a vacuum interrupter
KR101697580B1 (en) * 2015-02-23 2017-02-01 엘에스산전 주식회사 Vacuum Interrupter
FR3037709B1 (en) * 2015-06-22 2018-05-11 Schneider Electric Industries Sas VACUUM BULB AND ELECTRICAL PROTECTIVE APPARATUS COMPRISING SUCH BULB
JP6537378B2 (en) * 2015-07-07 2019-07-03 三菱電機株式会社 Vacuum valve and vacuum circuit breaker using the same
CN108447727B (en) * 2018-05-10 2024-08-23 厦门宏发电力电器有限公司 Vacuum arc extinguishing chamber
EP4421838A1 (en) * 2023-02-27 2024-08-28 Abb Schweiz Ag Vacuum interrupter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629204A1 (en) † 1996-07-19 1998-01-22 Abb Patent Gmbh Electrical vacuum switch chamber with movable contact-piece

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2440827B2 (en) * 1974-08-26 1978-07-20 Siemens Ag, 1000 Berlin Und 8000 Muenchen Vacuum switching tube
FR2683940B1 (en) * 1991-11-20 1993-12-31 Gec Alsthom Sa MEDIUM VOLTAGE CIRCUIT BREAKER FOR INDOOR OR OUTDOOR USE.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19629204A1 (en) † 1996-07-19 1998-01-22 Abb Patent Gmbh Electrical vacuum switch chamber with movable contact-piece

Also Published As

Publication number Publication date
EP1120803B1 (en) 2006-11-22
FR2804241B1 (en) 2002-06-21
ATE346371T1 (en) 2006-12-15
EP1120803A1 (en) 2001-08-01
DE60124601T3 (en) 2012-10-25
DE60124601T2 (en) 2007-09-13
FR2804241A1 (en) 2001-07-27
DE60124601D1 (en) 2007-01-04

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