EP0314540B1 - Opening device for a multipole circuit breaker with a rotating contact bridge - Google Patents

Opening device for a multipole circuit breaker with a rotating contact bridge Download PDF

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Publication number
EP0314540B1
EP0314540B1 EP88402559A EP88402559A EP0314540B1 EP 0314540 B1 EP0314540 B1 EP 0314540B1 EP 88402559 A EP88402559 A EP 88402559A EP 88402559 A EP88402559 A EP 88402559A EP 0314540 B1 EP0314540 B1 EP 0314540B1
Authority
EP
European Patent Office
Prior art keywords
contact
bar
rotary contact
springs
rotary
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
EP88402559A
Other languages
German (de)
French (fr)
Other versions
EP0314540A1 (en
Inventor
Roger Bolongeat-Mobleu
Jean-Pierre Néreau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Merlin Gerin SA
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Merlin Gerin SA
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Publication date
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Publication of EP0314540A1 publication Critical patent/EP0314540A1/en
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Publication of EP0314540B1 publication Critical patent/EP0314540B1/en
Anticipated expiration legal-status Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/32—Self-aligning contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/205—Details concerning the elastic mounting of the rotating bridge in the rotor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/2058—Rotating bridge being assembled in a cassette, which can be placed as a complete unit into a circuit breaker
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring

Definitions

  • the central part of the rotary contact comprises an oblong hole threaded on a fixed support rod to form a guide system having a degree of freedom in translation.
  • the fixed support rod has a cylindrical shape and is mounted coaxially in the bar, so that the rotary contact can move slightly in the direction perpendicular to the longitudinal axis of the pole to ensure a balanced contact pressure at the two cut-off intervals.
  • the diameter of the rod corresponds substantially to the width of the oblong hole, and any displacement of the rotary contact in the longitudinal direction is made impossible.
  • the longitudinal positioning of the rotary contact is precisely determined by the support rod, which imposes strict manufacturing tolerances.
  • a double-cut rotary switch similar to that described in the preamble of claim 1 is for example known from document DE-A-2,845,950.
  • the springs exert a contact pressure effect, and any refocusing towards an equilibrium position in the longitudinal direction is impossible.
  • the object of the invention is to simplify the mounting of a double-break rotary contact on the switching rod of a circuit breaker with molded insulating housing.
  • the breaking device is characterized in that the pair of springs is located in the housing of the rotary contact, the other of the ends of each spring being fixed to a hooking element of the rotary contact, that the two elements for attaching the pair of springs are diametrically opposite with respect to a fictitious axis of rotation of the rotary contact, that the two anchoring elements of said pair of springs are diametrically opposite with respect to the transverse fixed axis of the bar, and that the arrangement of the resorts ensures a floating mounting of the fictitious axis of rotation of the rotary contact relative to the transverse fixed axis of the bar, and simultaneously authorizes a torque of uniform distribution of the contact pressure and an elastic positioning at two degrees of freedom in translation of the rotary contact, the latter being stressed towards a position of equilibrium in the longitudinal direction of the pole by the self-centering effect of the springs.
  • the springs cooperating with the rotary contact can be springs of the torsion, traction or compression type.
  • a breaking pole 10 of a low voltage circuit breaker is housed in a compartment of the housing 12 of molded insulating material.
  • the pole 10 comprises a rotary contact 14 with double break capable of pivoting about a fictitious axis of rotation 16 between a closed position ( Figure 1), and an open position (not shown).
  • the fictitious axis of rotation 16 is located in the central zone of the pole 10, and the rotary contact 14 is constituted by a pair of lever arms 18, 20 extending between the fictitious axis of rotation 16 and two contact parts 22.24 opposite cooperating respectively with fixed contacts 26.28.
  • connection pads 30, 32 crossing two opposite faces of the housing 12.
  • the areas 30, 32 are aligned in the longitudinal direction 34 of the pole, and their internal ends carry the fixed contacts 26, 28.
  • An arc extinguishing chamber 36, 38 comprising a stack of metal sheets, is associated with each pair of contacts 26, 22; 28,24 located on the same side of the imaginary axis of rotation 16.
  • the nominal current flows through the main circuit of the pole by entering through one of the ranges, for example 30, and then passing through the fixed contact 26, the rotary contact 14, the fixed contact 28 to exit the pole by the other area 32.
  • the rotation of the movable contact 14 clockwise causes the two pairs of contacts 26,22 to separate simultaneously; 28,24, and the formation of two arcs connected in series.
  • the rotary contact 14 is rotated by means of a switch bar 40 of insulating material extending in the transverse direction of the imaginary axis of rotation 16 of the contact 14.
  • the bar 40 is guided in rotation around a transverse fixed axis by means of bearings arranged in the housing 12.
  • the bar 40 occupies the central compartment 39 of the housing 12, separated from the extinguishing chambers 36, 38 by walls 37 of subdivision. Ports 35 are provided in the walls 37 for the passage of the movable contact 14.
  • a control mechanism (not shown) is mechanically coupled to the bar 40 to transmit the opening and closing movements to the different poles.
  • the rotary contact 14 of the pole 10 is positioned in a housing 41 of the bar 40 extending perpendicular to the transverse fixed axis and parallel to the longitudinal direction 34.
  • the functions of holding and guiding the rotary contact 14 inside the housing 41 are provided by a pair of torsion springs 42, 44 arranged coaxially along the imaginary axis. of rotation 16 on either side of the contact 14.
  • the first torsion spring 42 has a curved end 46 hooked in a notch 47 of the lever arm 18, and the opposite end 48 is stressed by the elasticity of the spring 42 in abutment against an internal projection 50 of the bar 40.
  • the notch 47 for hooking the spring 42 is located on the opposite side of the contact piece 22.
  • the second spring 44 is anchored in a similar manner in a notch 52 of the lever arm 20, and on an internal projection 54 of the bar 40.
  • the two projections 50, 54 of the bar 40 are diametrically opposite with respect to the fixed axis transverse of the bar 40.
  • the presence of the two torsion springs 42,44 urges the rotary contact in a counterclockwise direction to ensure a uniform distribution of the contact pressure of the contact parts 22,24 on the corresponding fixed contacts 26,28, and at the same time allows a elastic positioning of the movable contact 14 along the longitudinal direction 34 of the pole.
  • the fictitious axis of rotation 16 of the movable contact 14 is mounted floating relative to the transverse fixed axis of the bar 40.
  • the movable contact 14 with double break tends towards a position d balance in the longitudinal direction as a function of the manufacturing tolerances of the housing 12 and of the bar 40.
  • the positioning of the rotary contact 14 in the housing 41 of the bar 40 is effected by means of two tension springs 60,62 arranged in the median plane having as trace the longitudinal direction 34 of the pole.
  • the first tension spring 60 is interposed between a lug 64 fixed on a boss of the lever arm 18, and a lug 66 for anchoring secured to the bar 40.
  • the second tension spring 62 is mounted in a similar manner between a lug 68 of the lever arm 20 and a tab 70 of the bar 40.
  • the two lugs 64 and 68 of the rotary contact 14 with double break are diametrically opposite with respect to the fictitious axis of rotation 16.
  • the two tabs 66 and 70 of the bar 40 are diametrically opposite with respect to the transverse fixed axis of the bar (40).
  • the two tension springs 60, 62 extend parallel to each other in an oblique direction relative to the horizontal direction 34 (FIG. 3). Such an arrangement of the springs 60, 62 makes it possible to generate both a torque of contact pressure, and an equilibrium position of the rotary contact 14 in the longitudinal direction 34.
  • the rotary contact 14 is associated with two compression springs 72,74 making it possible to obtain the contact pressure on the fixed contacts 26,28, and the longitudinal equilibrium position.
  • the rotary contact 14 can be separated from the fixed contacts 26, 28 by the effect of electrodynamic repulsion, while the bar 40 remains stationary until the control mechanism is triggered.
  • This repulsion effect is obtained by an appropriate shape, in particular in a loop, of the pads 30, 32 for supporting the two fixed contacts 26, 28.

Landscapes

  • Breakers (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)

Description

L'invention est relative à un dispositif de coupure pour un disjoncteur multipolaire à basse tension et à boîtier isolant, comprenant un barreau rotatif de commutation guidé en rotation autour d'un axe fixe transversal au moyen de paliers ménagés dans le boîtier, ledit axe étant perpendiculaire à la direction longitudinale de chaque pôle, lequel comporte:

  • une paire de contacts fixes en liaison avec les plages de raccordement;
  • un contact rotatif à double coupure s'étendant dans un logement du barreau selon la direction longitudinale du pôle, et ayant des pièces de contact opposées coopérant avec les contacts fixes en position de fermeture;
  • une paire de ressorts agencée à l'intérieur du barreau, et prenant appui sur le contact rotatif pour assurer une pression de contact prédéterminée des pièces de contact sur les contacts fixes, l'une des extrémités de chaque ressort coopérant avec un élément d'ancrage du barreau.
The invention relates to a breaking device for a low-voltage multipole circuit breaker and with an insulating housing, comprising a rotary switching bar guided in rotation around a transverse fixed axis by means of bearings provided in the housing, said axis being perpendicular to the longitudinal direction of each pole, which includes:
  • a pair of fixed contacts in connection with the connection pads;
  • a double-break rotary contact extending in a housing of the bar in the longitudinal direction of the pole, and having opposite contact parts cooperating with the fixed contacts in the closed position;
  • a pair of springs arranged inside the bar, and bearing on the rotary contact to ensure a predetermined contact pressure of the contact parts on the fixed contacts, one end of each spring cooperating with an anchoring element from the bar.

L'utilisation dans un disjoncteur d'un contact rotatif à double coupure permet la mise en série de deux arcs favorable à un pouvoir de coupure élevé. Dans un système hyperstatique à guidage intégral en rotation du contact mobile se pose le problème de la répartition uniforme de la pression de contact sur les deux contacts fixes. Une solution à ce problème est proposée dans le document EP-A-0 174904, dans lequel la partie centrale du contact rotatif comporte un trou oblong enfilé sur une tige fixe de support pour former un système de guidage ayant un degré de liberté en translation. La tige fixe de support a une forme cylindrique et est montée coaxialement dans le barreau, tel que le contact rotatif puisse se déplacer légèrement dans la direction perpendiculaire à l'axe longitudinal du pôle pour assurer une pression de contact équilibrée au niveau des deux intervalles de coupure. Le diamètre de la tige correspond sensiblement à la largeur du trou oblong, et tout déplacement du contact rotatif dans la direction longitudinale est rendu impossible. Le positionnement longitudinal du contact rotatif est déterminé avec précision par la tige support, ce qui impose des tolérances sévères de fabrication.The use in a circuit breaker of a double-breaking rotary contact allows the series connection of two arcs favorable to a high breaking capacity. In a hyperstatic system with integral guidance in rotation of the movable contact, the problem arises of the uniform distribution of the contact pressure on the two fixed contacts. A solution to this problem is proposed in document EP-A-0 174904, in which the central part of the rotary contact comprises an oblong hole threaded on a fixed support rod to form a guide system having a degree of freedom in translation. The fixed support rod has a cylindrical shape and is mounted coaxially in the bar, so that the rotary contact can move slightly in the direction perpendicular to the longitudinal axis of the pole to ensure a balanced contact pressure at the two cut-off intervals. The diameter of the rod corresponds substantially to the width of the oblong hole, and any displacement of the rotary contact in the longitudinal direction is made impossible. The longitudinal positioning of the rotary contact is precisely determined by the support rod, which imposes strict manufacturing tolerances.

Un interrupteur rotatif à double coupure analogue à celui décrit dans le préambule de la revendication 1 est par exemple connu du document DE-A-2.845.950. Dans cet interrupteur, les ressorts exercent un effet de pression de contact, et tout recentrage vers une position d'équilibre dans la direction longitudinale est impossible. En fonction de l'usure des contacts au cours de la durée de vie de l'interrupteur, il subsiste un risque de mauvais positionnement du contact mobile par rapport aux contacts fixes, ce qui est néfaste au bon fonctionnement de l'appareil.A double-cut rotary switch similar to that described in the preamble of claim 1 is for example known from document DE-A-2,845,950. In this switch, the springs exert a contact pressure effect, and any refocusing towards an equilibrium position in the longitudinal direction is impossible. Depending on the wear of the contacts during the lifetime of the switch, there remains a risk of incorrect positioning of the movable contact relative to the fixed contacts, which is detrimental to the proper functioning of the device.

L'objet de l'invention consiste à simplifier le montage d'un contact rotatif à double coupure sur le barreau de commutation d'un disjoncteur à boîtier isolant moulé.The object of the invention is to simplify the mounting of a double-break rotary contact on the switching rod of a circuit breaker with molded insulating housing.

Le dispositif de coupure selon l'invention est caractérisé en ce que la paire de ressorts se trouve dans le logement du contact rotatif, l'autre des extrémités de chaque ressort étant fixée à un élément d'accrochage du contact rotatif, que les deux éléments d'accrochage de la paire de ressorts sont diamétralement opposés par rapport à un axe fictif de rotation du contact rotatif, que les deux éléments d'ancrage de ladite paire de ressorts sont diamétralement opposés par rapport à l'axe fixe transversal du barreau, et que l'agencement des resorts assure un montage flottant de l'axe fictif de rotation du contact rotatif par rapport à l'axe fixe transversal du barreau, et autorise simultanément un couple de répartition uniforme de la pression de contact et un positionnement élastique à deux degrés de liberté en translation du contact rotatif, ce dernier étant sollicité vers une position d'équilibre dans la direction longitudinale du pôle par l'effet d'autocentrage des ressorts.The breaking device according to the invention is characterized in that the pair of springs is located in the housing of the rotary contact, the other of the ends of each spring being fixed to a hooking element of the rotary contact, that the two elements for attaching the pair of springs are diametrically opposite with respect to a fictitious axis of rotation of the rotary contact, that the two anchoring elements of said pair of springs are diametrically opposite with respect to the transverse fixed axis of the bar, and that the arrangement of the resorts ensures a floating mounting of the fictitious axis of rotation of the rotary contact relative to the transverse fixed axis of the bar, and simultaneously authorizes a torque of uniform distribution of the contact pressure and an elastic positioning at two degrees of freedom in translation of the rotary contact, the latter being stressed towards a position of equilibrium in the longitudinal direction of the pole by the self-centering effect of the springs.

Le montage flottant du contact rotatif au moyen des deux ressorts symétriques permet d'assurer un autocentrage du contact rotatif sur l'axe fictif de rotation. Ce dernier peut être confondu avec l'axe fixe transversal du barreau, ou au contraire se déplacer dans un plan perpendiculaire à celui-ci.The floating mounting of the rotary contact by means of two symmetrical springs ensures self-centering of the rotary contact on the fictitious axis of rotation. The latter can be confused with the transverse fixed axis of the bar, or on the contrary move in a plane perpendicular thereto.

Les ressorts coopérant avec le contact rotatif peuvent être des ressorts du type à torsion, traction ou compression.The springs cooperating with the rotary contact can be springs of the torsion, traction or compression type.

D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre de plusieurs modes de réalisation, donnés à titre d'exemples non limitatifs et représentés aux dessins annexés, dans lesquels:

  • la figure 1 est une vue schématique en coupe verticale d'un dispositif de coupure selon l'invention, les contacts du disjoncteur étant représentés en position de fermeture;
  • la figure 2 est une vue en coupe horizontale de la figure 1;
  • les figures 3 et 4 montrent des vues analogues à celles des figures 1 et 2, d'une variante de réalisation;
  • les figures 5 et 6 représentent des vues analogues à celles des figures 1 et 2 d'une autre variante.
Other advantages and characteristics will emerge more clearly from the description which follows of several embodiments, given by way of nonlimiting examples and represented in the appended drawings, in which:
  • Figure 1 is a schematic view in vertical section of a breaking device according to the invention, the contacts of the circuit breaker being shown in the closed position;
  • Figure 2 is a horizontal sectional view of Figure 1;
  • Figures 3 and 4 show views similar to those of Figures 1 and 2, of an alternative embodiment;
  • Figures 5 and 6 show views similar to those of Figures 1 and 2 of another variant.

En référence aux figures 1 et 2, un pôle de coupure 10 d'un disjoncteur à basse tension est logé dans un compartiment du boîtier 12 en matériau isolant moulé. Le pôle 10 comporte un contact rotatif 14 à double coupure susceptible de pivoter autour d'un axe fictif de rotation 16 entre une position de fermeture (figure 1), et une position d'ouverture (non représentée). L'axe fictif de rotation 16 se trouve dans la zone centrale du pôle 10, et le contact rotatif 14 est constitué par une paire de bras de leviers 18,20 s'étendant entre l'axe fictif de rotation 16 et deux pièces de contact 22,24 opposées coopérant respectivement avec des contacts fixes 26,28.Referring to Figures 1 and 2, a breaking pole 10 of a low voltage circuit breaker is housed in a compartment of the housing 12 of molded insulating material. The pole 10 comprises a rotary contact 14 with double break capable of pivoting about a fictitious axis of rotation 16 between a closed position (Figure 1), and an open position (not shown). The fictitious axis of rotation 16 is located in the central zone of the pole 10, and the rotary contact 14 is constituted by a pair of lever arms 18, 20 extending between the fictitious axis of rotation 16 and two contact parts 22.24 opposite cooperating respectively with fixed contacts 26.28.

Le raccordement électrique du pôle s'effectue au moyen de deux plages de connexion 30,32 traversant deux faces opposées du boîtier 12. Les plages 30,32 sont alignées selon la direction longitudinale 34 du pôle, et leurs extrémités internes portent les contacts fixes 26,28. Une chambre d'extinction d'arc 36,38 comprenant un empilage de tôles métalliques, est associée à chaque paire de contacts 26,22; 28,24 située d'un même côté de l'axe fictif de rotation 16.The electrical connection of the pole is made by means of two connection pads 30, 32 crossing two opposite faces of the housing 12. The areas 30, 32 are aligned in the longitudinal direction 34 of the pole, and their internal ends carry the fixed contacts 26, 28. An arc extinguishing chamber 36, 38 comprising a stack of metal sheets, is associated with each pair of contacts 26, 22; 28,24 located on the same side of the imaginary axis of rotation 16.

En position de fermeture du disjoncteur, le courant nominal traverse le circuit principal du pôle en entrant par l'une des plages, par exemple 30, et en parcourant ensuite le contact fixe 26, le contact rotatif 14, le contact fixe 28 pour sortir du pôle par l'autre plage 32. La rotation du contact mobile 14 dans le sens des aiguilles d'une montre provoque la séparation simultanée des deux paires de contacts 26,22; 28,24, et la formation de deux arcs connectés en série. Le contact rotatif 14 est entraîné en rotation au moyen d'un barreau 40 de commutation en matériau isolant s'étendant selon la direction transversale de l'axe fictif de rotation 16 du contact 14. Le barreau 40 est guidé en rotation autour d'un axe fixe transversal au moyen de paliers agencés dans le boîtier 12.In the closed position of the circuit breaker, the nominal current flows through the main circuit of the pole by entering through one of the ranges, for example 30, and then passing through the fixed contact 26, the rotary contact 14, the fixed contact 28 to exit the pole by the other area 32. The rotation of the movable contact 14 clockwise causes the two pairs of contacts 26,22 to separate simultaneously; 28,24, and the formation of two arcs connected in series. The rotary contact 14 is rotated by means of a switch bar 40 of insulating material extending in the transverse direction of the imaginary axis of rotation 16 of the contact 14. The bar 40 is guided in rotation around a transverse fixed axis by means of bearings arranged in the housing 12.

Le barreau 40 occupe le compartiment central 39 du boîtier 12, séparé des chambres d'extinction 36,38 par des parois 37 de subdivision. Des orifices 35 sont ménagés dans les parois 37 pour le passage du contact mobile 14.The bar 40 occupies the central compartment 39 of the housing 12, separated from the extinguishing chambers 36, 38 by walls 37 of subdivision. Ports 35 are provided in the walls 37 for the passage of the movable contact 14.

Un mécanisme de commande (non représenté) est accouplé mécaniquement au barreau 40 pour transmettre les mouvements d'ouverture et de fermeture vers les différents pôles.A control mechanism (not shown) is mechanically coupled to the bar 40 to transmit the opening and closing movements to the different poles.

Le contact rotatif 14 du pôle 10 est positionné dans un logement 41 du barreau 40 en s'étendant perpendiculairement à l'axe fixe transversal et parallèlement à la direction longitudinale 34.The rotary contact 14 of the pole 10 is positioned in a housing 41 of the bar 40 extending perpendicular to the transverse fixed axis and parallel to the longitudinal direction 34.

Les fonctions de maintien et de guidage du contact rotatif 14 à l'intérieur du logement 41 sont assurées par une paire de ressorts de torsion 42,44 disposés coaxialement le long de l'axe fictif de rotation 16 de part et d'autre du contact 14. Le premier ressort 42 de torsion comporte une extrémité recourbée 46 accrochée dans une encoche 47 du bras de levier 18, et l'extrémité opposée 48 est sollicitée par l'élasticité du ressort 42 en butée contre une saillie 50 interne du barreau 40. L'encoche 47 d'accrochage du ressort 42 est située du côté opposé de la pièce de contact 22.The functions of holding and guiding the rotary contact 14 inside the housing 41 are provided by a pair of torsion springs 42, 44 arranged coaxially along the imaginary axis. of rotation 16 on either side of the contact 14. The first torsion spring 42 has a curved end 46 hooked in a notch 47 of the lever arm 18, and the opposite end 48 is stressed by the elasticity of the spring 42 in abutment against an internal projection 50 of the bar 40. The notch 47 for hooking the spring 42 is located on the opposite side of the contact piece 22.

Le deuxième ressort 44 est ancré d'une manière similaire dans une encoche 52 du bras de levier 20, et sur une saillie 54 interne du barreau 40. Les deux saillies 50,54 du barreau 40 sont diamétralement opposées par rapport à l'axe fixe transversal du barreau 40.The second spring 44 is anchored in a similar manner in a notch 52 of the lever arm 20, and on an internal projection 54 of the bar 40. The two projections 50, 54 of the bar 40 are diametrically opposite with respect to the fixed axis transverse of the bar 40.

La présence des deux ressorts de torsion 42,44 sollicite le contact rotatif dans le sens trigonométrique pour assurer une répartition uniforme de la pression de contact des pièces de contact 22,24 sur les contacts fixes 26,28 correspondants, et autorise en même temps un positionnement élastique du contact mobile 14 le long de la direction longitudinale 34 du pôle. A l'intérieur du logement 41, l'axe fictif de rotation 16 du contact mobile 14 est monté flottant par rapport à l'axe fixe transversal du barreau 40. Il en résulte que le contact mobile 14 à double coupure tend vers une position d'équilibre dans la direction longitudinale en fonction des tolérances de fabrication du boîtier 12 et du barreau 40.The presence of the two torsion springs 42,44 urges the rotary contact in a counterclockwise direction to ensure a uniform distribution of the contact pressure of the contact parts 22,24 on the corresponding fixed contacts 26,28, and at the same time allows a elastic positioning of the movable contact 14 along the longitudinal direction 34 of the pole. Inside the housing 41, the fictitious axis of rotation 16 of the movable contact 14 is mounted floating relative to the transverse fixed axis of the bar 40. As a result, the movable contact 14 with double break tends towards a position d balance in the longitudinal direction as a function of the manufacturing tolerances of the housing 12 and of the bar 40.

Selon la variante des figures 3 et 4, le positionnement du contact rotatif 14 dans le logement 41 du barreau 40 s'opère au moyen de deux ressorts de traction 60,62 disposés dans le plan médian ayant pour trace la direction longitudinale 34 du pôle. Le premier ressort de traction 60 est intercalé entre un ergot 64 fixé sur un bossage du bras de levier 18, et une patte 66 d'ancrage solidaire du barreau 40. Le deuxième ressort de traction 62 est monté d'une manière similaire entre un ergot 68 du bras de levier 20 et une patte 70 du barreau 40. Les deux ergots 64 et 68 du contact rotatif 14 à double coupure sont diamétralement opposés par rapport à l'axe fictif de rotation 16. Les deux pattes 66 et 70 du barreau 40 sont diamétralement opposées par rapport à l'axe fixe transversal du barreau (40). Les deux ressorts de traction 60,62 s'étendent parallèlement l'un à l'autre selon une direction oblique par rapport à la direction horizontale 34 (figure 3). Une telle disposition des ressorts 60,62 permet d'engendrer à la fois un couple de pression de contact, et une position d'équilibre du contact rotatif 14 dans la direction longitudinale 34.According to the variant of Figures 3 and 4, the positioning of the rotary contact 14 in the housing 41 of the bar 40 is effected by means of two tension springs 60,62 arranged in the median plane having as trace the longitudinal direction 34 of the pole. The first tension spring 60 is interposed between a lug 64 fixed on a boss of the lever arm 18, and a lug 66 for anchoring secured to the bar 40. The second tension spring 62 is mounted in a similar manner between a lug 68 of the lever arm 20 and a tab 70 of the bar 40. The two lugs 64 and 68 of the rotary contact 14 with double break are diametrically opposite with respect to the fictitious axis of rotation 16. The two tabs 66 and 70 of the bar 40 are diametrically opposite with respect to the transverse fixed axis of the bar (40). The two tension springs 60, 62 extend parallel to each other in an oblique direction relative to the horizontal direction 34 (FIG. 3). Such an arrangement of the springs 60, 62 makes it possible to generate both a torque of contact pressure, and an equilibrium position of the rotary contact 14 in the longitudinal direction 34.

Sur les figures 5 et 6, le contact rotatif 14 est associé à deux ressorts de compression 72,74 permettant d'obtenir la pression de contact sur les contacts fixes 26,28, et la position longitudinale d'équilibre.In FIGS. 5 and 6, the rotary contact 14 is associated with two compression springs 72,74 making it possible to obtain the contact pressure on the fixed contacts 26,28, and the longitudinal equilibrium position.

On remarque sur les trois variantes des figures 1 à 6, que le contact rotatif 14 peut être séparé des contacts fixes 26,28 par effet de répulsion électrodynamique, pendant que le barreau 40 reste immobile jusqu'au déclenchement du mécanisme de commande. Cet effet de répulsion est obtenu par une forme appropriée, notamment en boucle, des plages 30, 32 de support des deux contacts fixes 26, 28.It will be noted in the three variants of FIGS. 1 to 6, that the rotary contact 14 can be separated from the fixed contacts 26, 28 by the effect of electrodynamic repulsion, while the bar 40 remains stationary until the control mechanism is triggered. This repulsion effect is obtained by an appropriate shape, in particular in a loop, of the pads 30, 32 for supporting the two fixed contacts 26, 28.

Claims (6)

  1. A breaking device for a low voltage multipole circuit breaker with moulded case (12), comprising a rotary switching bar (40) guided in rotation around a transverse fixed axis by means of bearings arranged in the case (12), said axis being perpendicular to the longitudinal direction (34) of each pole, which comprises :
    - a pair of stationary contacts (26, 28) connected to the connection terminals (30, 32);
    - a double-break rotary contact (14) extending in a housing (41) of the bar (40) according to the longitudinal direction (34) of the pole, and having opposing contact parts (22, 24) cooperating with the stationary contacts (26, 28) in the closed position;
    - a pair of springs (42, 44; 60, 62; 72, 74) arranged inside the bar (40) and bearing on the rotary contact to provide a pre-determined contact pressure of the contact parts (22, 24) on the stationary contacts (26, 28), one of the ends of each spring (42, 44; 60, 62; 72, 74) cooperating with a securing part (50, 54; 66, 70) of the bar (40);
    characterized in that the pair of springs (42, 44; 60, 62; 72, 74) is located in the housing (41) of the rotary contact (14), the other of the ends of each spring (42, 44; 60, 62; 72, 74) being fixed to a latching part (47, 52; 64, 68) of the rotary contact (14), that the two latching parts (47, 52; 64, 68) of the pair of springs (42, 44; 60, 62; 72, 74) are diametrically opposite with respect to a dummy rotation axis (16) of the rotary contact (14), that the two securing parts (50, 54; 66, 70) of said pair or springs are diametrically opposite with respect to the transverse fixed axis of the bar (40), and that the arrangement of the springs (42, 44; 60, 62; 72, 74) ensures floating mounting of the dummy rotation axis (16) of the rotary contact (14) with respect to the transverse fixed axis of the bar (40), and simultaneously enables a contact pressure torque of uniform distribution and flexible positioning with two degrees of freedom in translation of the rotary contact (14), the latter being urged to an equilibrium position in the longitudinal direction (34) of the pole by the self-centering effect of the springs (42, 44; 60, 62; 72, 74).
  2. The breaking device according to claim 1, characterized in that the rotary contact (14) comprises two opposite lever arms (18, 20), that the two positioning springs of the rotary contact (14) are torsion springs (42, 44) arranged coaxially along the dummy rotation axis (16) and on each side of the rotary contact (14), that each of said latching parts is formed by a notch (47, 52) located on the corresponding lever arm (18, 20) and on the opposite side from the contact part (22, 24), and that each of said securing parts is formed by an internal protrusion (50, 54) of the bar (40).
  3. The breaking device according to claim 1, characterized in that the rotary contact (14) comprises two opposite lever arms (18, 20) and that the two positioning springs of the rotary contact (14) are tension springs (60, 62) extending parallel to one another in an oblique direction to the longitudinal direction.
  4. The breaking device according to claim 3, characterized in that each of said securing parts is formed by a catch (64, 68) situated on the corresponding lever arm (18, 20), and that each of said securing parts is formed by a lug (66, 70) of the bar (40).
  5. The breaking device according to one of the claims 1 to 4, characterized in that two are extinguishing chambers (36, 38) are disposed on each side of the bar (40) along the longitudinal direction (34), with interposed subdividing walls (37) having orifices (35) for the rotary contact (14) to pass through.
  6. The breaking device according to one of the claims 1 to 5, characterized in that the terminals (30, 32) supporting the stationary contacts (26, 28) are loop-shaped to generate an electrodynamic repulsion effect at the beginning of separation of the circuit breaker contacts.
EP88402559A 1987-10-26 1988-10-11 Opening device for a multipole circuit breaker with a rotating contact bridge Expired - Lifetime EP0314540B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8714964A FR2622347B1 (en) 1987-10-26 1987-10-26 CUTTING DEVICE FOR A MULTIPOLAR CIRCUIT BREAKER WITH DOUBLE ROTARY CONTACT
FR8714964 1987-10-26

Publications (2)

Publication Number Publication Date
EP0314540A1 EP0314540A1 (en) 1989-05-03
EP0314540B1 true EP0314540B1 (en) 1993-09-29

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ID=9356273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402559A Expired - Lifetime EP0314540B1 (en) 1987-10-26 1988-10-11 Opening device for a multipole circuit breaker with a rotating contact bridge

Country Status (6)

Country Link
US (1) US4910485A (en)
EP (1) EP0314540B1 (en)
JP (1) JP2666828B2 (en)
DE (1) DE3884557T2 (en)
ES (1) ES2046322T3 (en)
FR (1) FR2622347B1 (en)

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Also Published As

Publication number Publication date
JPH01166429A (en) 1989-06-30
FR2622347A1 (en) 1989-04-28
ES2046322T3 (en) 1994-02-01
FR2622347B1 (en) 1995-04-14
DE3884557D1 (en) 1993-11-04
EP0314540A1 (en) 1989-05-03
JP2666828B2 (en) 1997-10-22
US4910485A (en) 1990-03-20
DE3884557T2 (en) 1994-05-05

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