EP0473619B1 - Mecanisme de commutation pour disjoncteur de protection - Google Patents

Mecanisme de commutation pour disjoncteur de protection Download PDF

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Publication number
EP0473619B1
EP0473619B1 EP90906912A EP90906912A EP0473619B1 EP 0473619 B1 EP0473619 B1 EP 0473619B1 EP 90906912 A EP90906912 A EP 90906912A EP 90906912 A EP90906912 A EP 90906912A EP 0473619 B1 EP0473619 B1 EP 0473619B1
Authority
EP
European Patent Office
Prior art keywords
lever
release
switching mechanism
trigger
contact
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
EP90906912A
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German (de)
English (en)
Other versions
EP0473619A1 (fr
Inventor
Dieter Kropp
Gerhard Scholz
Günter Böker
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.)
OFFERTA DI LICENZA AL PUBBLICO
Original Assignee
Licentia Patent Verwaltungs GmbH
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Publication date
Application filed by Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to AT90906912T priority Critical patent/ATE93343T1/de
Publication of EP0473619A1 publication Critical patent/EP0473619A1/fr
Application granted granted Critical
Publication of EP0473619B1 publication Critical patent/EP0473619B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7418—Adjusting both electrothermal and electromagnetic mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H2071/7454—Adjusting only the electrothermal mechanism with adjustable axis of transmission lever between bimetal element and trip lever

Definitions

  • the invention relates to a switching mechanism for a circuit breaker in which a contact lever against the action of a spring can be brought into the closed position with a fixed contact piece and is held in this closed position with the support of the spring, by means of a hand-operated toggle spring-loaded in the switching-off direction and a pivotal lever pivoted thereon the contact lever is supported via a latching point on the latching lever, and with a pivotably mounted release lever acting on the latching point, which can be rotated by a magnetic trigger, with a release lever, pivotably mounted separately from the release lever, which in turn is arranged in a plane parallel to the pivoting plane of the release lever is, and with a rigidly arranged in the housing, designed as a bimetallic strip thermal release.
  • Such a switching mechanism is known from DE-A-29 43 696.
  • the contact lever and a separately mounted pawl together with a bracket serving as a latch lever form the latching point.
  • the contact lever and the pawl are each clamped to one another by means of a spring in such a way that they enclose the bracket like a clamp and this can be supported on the two latching partners mentioned.
  • the bracket held at the latching point pushes the contact lever into the closed position against the fixed contact piece.
  • the pawl in turn has an approach on which the magnetic release works in the event of a short circuit.
  • a self-switch is known (DE-A-35 15 297), in each of which a magnetic and thermal release element by means of individually adjustable transmission elements are operatively connected to a latching point of the switching mechanism.
  • the transmission element for the thermal release element is an intermediate lever acted upon by a rigid, non-adjustable bimetallic strip, which in turn acts on a lever releasing the latching point.
  • This lever can also be pivoted in the unlatching direction by the magnetic release element via a clutch lever and a bracket.
  • the separate arrangement of the transmission elements in particular simplifies the setting of the bimetallic release. Ultimately, however, the movements of both release elements are transferred to a common release lever. With this arrangement, this also results in a mutual coupling of the triggering elements.
  • DE-U-8 500 461 discloses a latching arrangement consisting of a contact lever and a latch lever, which has a release lever which acts directly on the latching point. This transmits the movements of the Release organs do not independently on the latching point, but the release movements influence each other.
  • the mutual coupling of the triggering elements is also disadvantageous here.
  • the invention has for its object to avoid the disadvantages of the known switch and to simplify the switching mechanism mentioned at the outset in such a way that the release movements controlled by the release elements are completely decoupled from one another and the thermal release can be optimally adapted to the release point independently of the magnetic release.
  • the effect of the magnetic release path and the thermal release path on the unlatching point are completely separated from one another. Since there are also only a few parts, a high degree of shock and vibration resistance is achieved.
  • the thermal release system is set, there is also no deformation of components, so that the entire system is relatively insensitive. Due to the small masses to be moved, the entire switching mechanism also shows an extremely fast switch-off behavior.
  • the switching mechanism of a circuit breaker which is shown in the switched-off position and is shown schematically in the single drawing figure, has a pivotable manual control knob (1) to which a bow-shaped latch lever (2) is pivoted. With its angled free end (2a), this forms a latching surface which interacts with a latching lug (3a) of a preferably rigid contact lever (3).
  • the contact lever is pivotally mounted on an axis (3c) by means of an elongated hole (3b) and is itself loaded in the direction of switching off by a tension spring (4) which engages between the elongated hole (3b) and the latching lug (3a).
  • the contact lever works with its contact-side end (3d) on a fixed contact piece (5).
  • the latch lever (2) loaded by a spring (2b) in the clockwise direction comes with its latching surface in front of the latching nose (3a) and then turn the contact lever around the axis (3c) clockwise against the force of the tension spring (4).
  • the contact lever with its contact-side end (3d ') touches the fixed contact piece (5) in order to then lift off from the axis (3c) within the elongated hole (3b), so that the tension spring (4) now generates the contact pressure and tensions the switching mechanism.
  • the elongated hole (3b) in the contact lever thus serves as a fulcrum, enables the dead center bracing of the knee joint formed from the manual control knob (1) and ratchet lever (2) and provides a sufficient burn-up reserve.
  • thermal release (8) and a magnetic release (9) are arranged in the merely indicated housing (6) of the circuit breaker in series connection with the contact point (3d, 5).
  • the thermal release for limiting the overcurrent is designed as a simple smooth bimetallic strip (8a) and with its base (8b) is preferably rigidly attached to a rear extension of an arc guide rail (10), which belongs to the extinguishing chamber (7) of the switch located below the contact point .
  • a line (11a) also leads from the base point (8b) to a connecting terminal (11).
  • the bimetallic strip which is not adjustable and is arranged approximately in the same direction as the contact lever, is connected to the contact lever (3) at its free end (8c), which changes position when exposed to heat, via a flexible line (8d) and engages with its free-standing end (8c) behind a release lever (12).
  • This is designed as an angle lever and in turn is pivotally mounted on a bearing body (13) to be described in more detail.
  • the unlatching lever (12) is preferably a stamped part, which is made electrically non-conductive by surface treatment, or a molded part made of a non-conductive material. With its lever arm (12a) the unlatching lever (12) engages under the angled end (2a) of the ratchet lever (2), the upper side of the lever arm having a curve shape adapted to the pivoting path of the contact lever (3). If a current flows through the thermal release, the bimetal strip (8a), which heats up due to the internal resistance, bends with its free end (8c) in the direction of the release lever (12) and engages behind it Lever arm (12b).
  • the unlatching lever is pivoted clockwise so far that the end (2a) of the pawl lever is raised by the lever arm (12a) and the latch is released. Under the action of the tension spring (4), the contact lever (3) then pivots in the direction of switching off.
  • the magnetic release (9), which is also located in the current path to a further connection terminal, not shown, via the fixed contact piece (5) is essentially formed by a release coil (9a) surrounded by a return iron with a plunger armature (9b) guided therein.
  • the latter works with its end designed as a plunger on a release lever (14) which is arranged pivotably about an axis (14c) fixed to the housing on the side of the contact lever opposite the unlatching lever (12).
  • the angular release lever also engages with its lever arm (14a) under the angled end (2a) of the ratchet lever (2) in a plane parallel to the lever arm (12a).
  • the top of the lever arm (14a) is provided with a curved cam track and is thus optimally adapted to the movement of the ratchet lever (2) when the mechanism is switched on, while the other lever arm (14b) of the release lever is hammer-shaped.
  • the plunger armature (9b) which snaps forward in the direction of the lever arm (14b) in the event of a short-circuit current, pivots the release lever counterclockwise in such a way that it releases the latch (2a, 3a) and then accelerates the contact lever, accelerated by the hammer head, into the open position shown, the Tension spring (4) is also effective as an opening spring.
  • the movement of the magnetic release (9) is thus transmitted to the latching point via the release lever (14) completely independently of the unlatching movement of the thermal release (8).
  • the curved upper sides of the lever arms (12a or 14a) can also be optimally adapted to the sequence of movements of the ratchet lever (2) during the switching-on process, in order also in the event of a fault, i. H. in the event of an overload or short circuit, unlatch early before the contact lever reaches its usual over-dead center position.
  • the unlatching lever (12) By turning the bearing body, which is kept stiff in the housing, the unlatching lever (12) can be moved due to the eccentricity of its bearing point in such a way that the given one overload current and the resulting curvature of the bimetallic strip (8a) the release via the release lever (12) is released precisely and the switching mechanism automatically interrupts the flow of current at the contact point.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Abstract

Les disjoncteurs de protection présentent un point d'interruption de contact qui est encliqueté le plus souvent par l'intermédiaire d'un mécanisme à genouillère. Si un courant d'intensité anormalement élevé circule, le point d'encliquetage est désaccouplé au moyen d'un interrupteur thermique ou magnétique, de sorte que le courant est interrompu. Pour le mécanisme de commutation, les mouvements de déclenchement des deux interrupteurs doivent être transmis au point d'encliquetage, par l'intermédiaire de moyens aussi simples que possible, entièrement désaccouplés les uns des autres. A cet effet, un levier de déclenchement (14) sollicité par un interrupteur magnétique (9) et un levier de décliquetage (12) sollicité par un interrupteur thermique (8) sont montés de manière à pouvoir pivoter indépendamment l'un de l'autre et séparément, chacun sur un côté d'un levier de contact (3). Les deux leviers précités (12, 14) sont en prise par leurs bras parallèles superposés (14a, 12a), au dessous d'un point d'encliquetage qui est formé par l'extrémité repliée (2a) d'un levier à cliquet (2) et par un nez (3a) formant une saillie façonnée directement sur le levier de contact (3). Par déplacement d'une manette à commande manuelle (1) en une position correspondant au point mort supérieur du levier à cliquet (2), le mécanisme de commutation se trouve tendu, le levier de contact (3) prenant alors appui sur le contact fixe (5) et sur le point d'encliquetage (2a, 3a). En cas de surintensité, l'interrupteur thermique (8/8a) non réglable et fixé rigidement s'incurve et déplace le levier de décliquetage (12) dans le sens des aiguilles d'une montre, cependant qu'en cas de court-circuit, le mouvement de déclenchement de l'interrupteur magnétique (9) est transmis dans le sens inverse des aiguilles d'une montre au levier de déclenchement (14), de sorte que le point d'encliquetage peut être dégagé indépendamment. Le mécanisme de commutation convient notamment pour des disjoncteurs de protection de construction étroite.

Claims (10)

  1. Mécanisme de commutation pour disjoncteur de protection, comportant un levier de contact (3) qui peut être amené en position de fermeture avec une pièce de contact (5) fixe contre l'action d'un ressort (4) et être maintenu dans cette position de fermeture avec l'appui du ressort (4), au moyen d'une manette de manoeuvre (1) chargée par ressort dans le sens de la coupure, et d'un levier d'encliquetage (2) articulé à cette dernière de façon à pouvoir pivoter, le levier de contact (3) se trouvant en appui sur le levier d'encliquetage (2) par le biais d'un encliquetage (2a, 3a); comportant également un levier déclencheur (14) pivotant, agissant sur l'encliquetage (2a, 3a), qui peut être tourné par un disjoncteur magnétique (9); un levier de décliquetage (12) pouvant pivoter séparément du levier déclencheur (14) et qui est placé quant à lui dans un plan parallèle au plan de pivotement du levier déclencheur (14); et un disjoncteur thermique (8) réalisé sous forme de bilame (8a), monté de façon rigide dans le boîtier (6), mécanisme de commande caractérisé en ce que l'encliquetage (2a, 3a) est prévu seulement entre le levier d'encliquetage (2) articulé à la manette de manoeuvre (1) et le levier de contact (3) en appui sur celui-ci, en ce que le levier déclencheur (14) et le levier de décliquetage (12) agissent directement sur le levier d'encliquetage (2), le levier de décliquetage (12) étant contacté en cas de surintensité de courant par le bilame (8a) non-ajustable et en ce que le décliquetage s'effectue par le levier déclencheur (14) ou par le levier de décliquetage (12), dans tous les cas indépendamment l'un de l'autre.
  2. Mécanisme de commutation suivant la revendication 1, caractérisé en ce que le levier de décliquetage (12) est un levier coudé, dont le point d'appui (12c) est disposé sur un pivot (13a) ajustable.
  3. Mécanisme de commutation suivant la revendication 2, caractérisé en ce que le pivot (13a) du levier de décliquetage (12) est placé excentriquement dans un logement (13) monté à rotation dans le boîtier (6).
  4. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 3, caractérisé en ce que le levier déclencheur (14) et le levier de décliquetage (12) sont placés chacun sur un côté opposé du levier de contact (3) de préférence rigide et muni d'un ergot d'encliquetage (3a).
  5. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le levier de décliquetage (12) est directement poussé dans le sens de décliquetage à un de ses bras (12b) par l'extrémité libre (8c) du bilame (8a).
  6. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 5, caractérisé en ce que le levier de décliquetage (12) s'engage par son autre bras coudé (12a) sous une extrémité coudée (2a) du levier d'encliquetage (2) et bascule dans le sens des aiguilles d'une montre lors d'un processus de déclenchement.
  7. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 4, caractérisé en ce que le levier déclencheur (14) s'engage par un bras libre coudé (14a) sous une extrémité coudée (2a) du levier d'encliquetage (2) et bascule dans le sens contraire des aiguilles d'une montre lors d'un processus de déclenchement.
  8. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 7, caractérisé en ce que les bras (12a ou 14a) du levier déclencheur (14) et du levier de décliquetage (12) qui agissent sur le levier d'encliquetage (2) sont disposés chacun au-dessus du point d'appui (3b, 3c) du levier de contact, sur une face large opposée du levier de contact (3), en se chevauchant en sens contraire.
  9. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que le levier de décliquetage (12) est une pièce découpée métallique qui est rendue non-électroconductrice par un traitement de surface ultérieur.
  10. Mécanisme de commutation suivant l'une quelconque des revendications 1 à 8, caractérisé en ce que le levier de décliquetage (12) est une pièce moulée dans une matière non-électroconductrice.
EP90906912A 1989-05-27 1990-05-18 Mecanisme de commutation pour disjoncteur de protection Expired - Lifetime EP0473619B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90906912T ATE93343T1 (de) 1989-05-27 1990-05-18 Schaltmechanismus fuer einen leitungsschutzschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917326A DE3917326A1 (de) 1989-05-27 1989-05-27 Schaltmechanismus fuer einen leitungsschutzschalter
DE3917326 1989-05-27

Publications (2)

Publication Number Publication Date
EP0473619A1 EP0473619A1 (fr) 1992-03-11
EP0473619B1 true EP0473619B1 (fr) 1993-08-18

Family

ID=6381536

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90906912A Expired - Lifetime EP0473619B1 (fr) 1989-05-27 1990-05-18 Mecanisme de commutation pour disjoncteur de protection

Country Status (4)

Country Link
EP (1) EP0473619B1 (fr)
DE (2) DE3917326A1 (fr)
ES (1) ES2044582T3 (fr)
WO (1) WO1990015431A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4313207A1 (de) * 1993-04-22 1994-10-27 Kopp Heinrich Ag Leitungsschutzschalter
ES2147158B1 (es) * 1998-12-30 2001-03-01 Power Controls Iberica Sl Perfeccionamientos en los disyuntores automaticos de escape a tierra.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1067514B (de) * 1955-10-15 1959-10-22 Calor Emag Elektrizitaets Ag Ausloeseeinrichtung fuer mehrpolige Leistungs-Selbstschalter
FR2344949A1 (fr) * 1976-03-15 1977-10-14 Merlin Gerin Disjoncteur miniature basse tension
DE2938858C2 (de) * 1979-09-26 1983-10-13 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltmechanismus für einen Leitungsschutzschalter
DE2943696C2 (de) * 1979-10-30 1982-06-24 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltmechanismus für Leitungsschutzschalter
DE8500461U1 (de) * 1985-01-10 1986-02-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Verklinkungsanordnung eines Leitungsschutzschalters
DE3515297A1 (de) * 1985-04-27 1986-11-06 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Selbstschalter mit magnetischem und thermischem ausloeseorgan

Also Published As

Publication number Publication date
DE3917326A1 (de) 1990-11-29
EP0473619A1 (fr) 1992-03-11
WO1990015431A1 (fr) 1990-12-13
DE59002402D1 (de) 1993-09-23
ES2044582T3 (es) 1994-01-01

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