EP2345056B1 - Relais électrique pour surcharge avec une bascule montée pivotante - Google Patents

Relais électrique pour surcharge avec une bascule montée pivotante Download PDF

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Publication number
EP2345056B1
EP2345056B1 EP09744955A EP09744955A EP2345056B1 EP 2345056 B1 EP2345056 B1 EP 2345056B1 EP 09744955 A EP09744955 A EP 09744955A EP 09744955 A EP09744955 A EP 09744955A EP 2345056 B1 EP2345056 B1 EP 2345056B1
Authority
EP
European Patent Office
Prior art keywords
rocker
closed position
spring
contact
contact point
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.)
Active
Application number
EP09744955A
Other languages
German (de)
English (en)
Other versions
EP2345056A1 (fr
Inventor
Richard Kommert
Rüdiger Schweitzer
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.)
ABB AG Germany
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ABB AG Germany
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Filing date
Publication date
Application filed by ABB AG Germany filed Critical ABB AG Germany
Publication of EP2345056A1 publication Critical patent/EP2345056A1/fr
Application granted granted Critical
Publication of EP2345056B1 publication Critical patent/EP2345056B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H83/00—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
    • H01H83/20—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition
    • H01H83/22—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages
    • H01H83/223—Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current operated by excess current as well as by some other abnormal electrical condition the other condition being imbalance of two or more currents or voltages with bimetal elements
    • 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
    • H01H2071/109—Operating or release mechanisms with provisions for selecting between automatic or manual reset
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/06—Energy stored by deformation of elastic members by compression or extension of coil springs
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element

Definitions

  • the invention relates to an overload relay, with a pivotally mounted rocker on which at least one movable contact piece of a contact point is mounted, wherein the rocker overflow occurs in the event of overcurrent due to the action of a thermal release from a first closed position to a second closed position, and with a between a first and a second position convertible changeover to manual or automatic provision of the rocker from the second to the first closed position, according to the preamble of claim 1.
  • An electrical overload relay is used to protect an electric motor against overcurrents.
  • Known overcurrent relays have as thermal tripping elements thermostatic bimetals, which are heated by the overcurrents and bend out, thereby opening or closing a switch contact point.
  • US 3866 156 discloses an overload relay according to the preamble of claim 1.
  • the DE 299 17 173 U1 shows an actuating device for an overload relay with a rocker on which two contact bridges for electrically conductive bridging two FestAuthmove are resiliently mounted.
  • the two FestAuthffyschreibe are designed as opener / closer - pair.
  • the rocker In the idle state, the rocker is in its first closed position and the first contact point, the opener, is closed, and the second contact point, the normally open, is open. If an overcurrent heats the bimetallic strip, it acts on the rocker, possibly with the interposition of further mechanical lever or slide arrangements, causing it to snap over into its second closed position. In the second closed position, the first contact point is then opened and the second contact point is closed.
  • the rocker In manual operation, the rocker remains in its second closed position until it is forcibly returned to its first closed position due to the operation of a reset member by an operator from the outside.
  • the rocker In automatic mode, the rocker automatically snaps back to its first closed position as soon as the overcurrent stops.
  • a generic overload relay has a changeover device, which can be changed from outside the device by an operator from a first to a second position.
  • the first position corresponds to the setting "Automatic mode”
  • the second position corresponds to the setting "Manual mode”.
  • a snap-action switch is used in a generic overload relay.
  • the rocker from the first closed position over a dead center position snaps into the second closed position.
  • the contact gap on the normally closed contact is reduced so much that the snap-action switching point of the snap-action mechanism remains in front of the dead center position.
  • the rocker then immediately snaps back into its first closed position when the overcurrent is no longer present.
  • the contact distance at the NC is greater, thus the snap-action point is behind the dead center. After snapping into the second closed position, the rocker then remains there until it is manually forced back into the starting position.
  • the invention is therefore characterized in that the rocker is held by a snap spring in its first and second closed position and can snap against the restoring force of the snap spring on a dead center between the two closed positions that cooperates with the rocker a functional spring, that this one Snapping the rocker supported from the first to the second closed position, and that the functional spring under the influence of the switching device can release a snap back of the rocker from the second to the first closed position or block.
  • the rocker both in automatic and in manual operation snaps from its first stable closed position to its second, stable closed position.
  • the contact distance in manual and in automatic mode is the same.
  • the rocker presses in its first stable closed position, the function spring counter to their restoring force in a first operative position in which the function spring acts by its restoring force the rocker in the direction of the second closed position.
  • the functional spring acts both in automatic and in manual operation to assist opening.
  • the changeover means comprises a push button which is depressed in its first position and thereby holds the functional spring in an intermediate position in which it releases the rocker after overshooting the dead center in the second closed position to snap back into the first closed position ,
  • the overload relay is thus in automatic mode, because an immediate snap back of the rocker after the overcurrent has subsided is made possible.
  • An advantageous embodiment is characterized in that the push button releases the functional spring in its second position, so that it acts on the rocker even after exceeding its dead center in the direction of the second closed position.
  • the overload relay is thus in manual operation, because an immediate snap back of the rocker after the overcurrent has subsided is prevented by the functional spring, which continues to open the rocker. Only by manual reset from the outside can the rocker be snapped back.
  • An advantageous embodiment is characterized in that a first rocker arm cooperates with a first contact point and a second rocker arm with a second contact point, so that closed in the first closed position of the rocker the first contact point and the second contact point, and in the second closed position of the rocker the first contact point is opened and the second contact point is closed.
  • An advantageous embodiment is characterized in that a first contact bridge is mounted on the first rocker arm and a second contact bridge for the electrically conductive bridging of at least two fixed contact pieces is mounted on the second rocker arm.
  • An advantageous embodiment is characterized in that the contact pressure force is applied to the second contact point in the second closed position of the rocker by the snap spring.
  • An advantageous embodiment is characterized in that the contact pressure force is applied to the first contact point in the first closed position of the rocker by a contact pressure spring.
  • the pivoting back of the rocker from the second closed position over the dead center in the first closed position is supported by the contact pressure spring after elimination of the effect of the thermal release, so that a snap back of the rocker can be made from the second to the first closed position.
  • FIG. 1 shows a partial section of an electrical overcurrent relay 1, with a housing 2 in which a shift key 40 in the form of a push button can be pressed by actuation from outside the housing and let out again.
  • the shift key 40 is shown schematically as a cylindrical body with an actuating extension 41, wherein the cylindrical body 40 is accessible with its operating side 42 from outside the housing for actuation.
  • the exact nature of the storage of the shift key, such as their interaction with a return spring and the necessary locking and unlocking mechanisms are not shown here in detail, since any known configuration can be used for this purpose.
  • a rocker 20 is further arranged in the form of a double lever, with a first arm 22 and a second arm 23.
  • the first arm 22 is associated with a first contact point 17.
  • the second arm 23 is associated with a second contact point 12.
  • the rocker 20 has approximately centrally a bearing extension 21 which is integrally formed approximately perpendicular to the first arm 22 and is mounted with its free end in a housing-fixed bearing cup 201.
  • a pivot point 202 for the rocker 20 is formed on the bearing cup, by which it can be pivoted in the direction of arrow P.
  • the rocker 20 is supported with its bearing extension 21 so on a cutting bearing, which includes the bearing cup 201 and the free end of the bearing extension 21.
  • other known storage methods and devices can be used, as long as they perform the same function, namely to allow a pivotable mounting of the rocker 20 in the housing 2.
  • a pin 24 Approximately in the middle between the first and second arm 22, 23, in the neck region of the bearing extension 21 is located on the rocker 20, a pin 24. At this pin 24 a snap spring 30 is mounted, the other end to a below the cutting bearing and the Lüpfanne 201 fixed housing anchored point 31 is attached. The imaginary connecting line between the pin 24 and the pivot 202 bears the reference numeral 241.
  • the rocker 20 with the snap spring 30 forms a snap-action mechanism.
  • the restoring force of the snap spring 30 acts on the articulation point 24 and acts in the direction of arrow K, on the left, the second arm associated side of the rocker 20. As a result, it pulls the rocker 20 counterclockwise to a position in which the rocker 20 itself in its first stable position or in its first closed position.
  • the first contact point 17 is closed, this is therefore also referred to as an opener.
  • the second contact point 12 is open, it is therefore also referred to as a closer.
  • the first contact point 17 comprises a fixed contact 15 and a movable contact 16 mounted on a pivotably mounted contact arm 18.
  • the contact pressure force is applied to the first contact point 17 by a contact pressure spring 60 acting on the contact arm 18.
  • This is hinged at its other end to an adjusting element 70, which can be adjusted in the direction of arrow E up or down, so that the contact pressure force is adjustable.
  • the second contact point 12 comprises a fixed contact 10 and a movable contact 11 fastened to the free end of the second arm 23 of the rocker 20.
  • the second contact point is open. In its closed position, which will be described below, the contact pressure force is applied to the second pad 12 by the snap spring 30, as will be shown below.
  • a function spring 50 is further attached.
  • this is designed as a leg spring with a first and a second spring arm 51, 52 which is mounted in a housing-fixed axis 53 and the restoring force acts in the opening direction of the angle formed by the two spring arms 51, 52 angle.
  • the first arm 51 is supported fixed to the housing, and the second arm 52 presses with its free end resiliently against a stop 25 on the second arm 23 of the rocker 20 and acts on these in the direction of arrow F with a functional force, which Rocker 20 is looking to turn clockwise.
  • the function spring 50 is here in its first operative position.
  • the pulling force K which exerts the snap spring 30 on the rocker 20 in the counterclockwise direction, is so great that it holds the rocker 20 against the restoring force F of the functional spring 50 in the first stable position.
  • the push button 40 is depressed so that its actuating extension 41 comes to lie in the vicinity of the second arm 52 and thereby allows the second arm 52 only a very small range of motion upwards, ie in the opening direction of the leg spring 50.
  • the overcurrent relay is in the automatic mode, as will be apparent below.
  • the push button can be executed and stored in a known manner. It can be held against the restoring force of a spring, for example, by pressing and twisting in a latching position in the depressed position. To release, it is then first turned back out of the detent position so that the spring can then push it out again.
  • the overcurrent relay 1 is shown in the tripped state.
  • the zugfederbte by the snap spring 30 rocker 20 is pivoted or snapped clockwise into its second stable position or its second closed position.
  • the thermal release optionally with the interposition of an actuating element and a lever and / or slide assembly - not shown here - on the bearing extension 21 and on the snap spring 30, so on the snap-action mechanism exerts.
  • the actuator acts on the snap spring and presses clockwise down to the left until the dead center, also referred to as dead center, reached and overcome and the snap spring 30 then the rocker 20 in the second stable closed position draws.
  • the snapping can also be caused by the fact that the actuating element exerts a triggering force on the bearing extension 21.
  • the triggering force is in FIG. 2 indicated for this case by an arrow A.
  • the release force A supported by the functional force F of the functional spring 50, first pivots the rocker 20 clockwise until the force arrow K of the snap spring 30 is in line with the imaginary connecting line 241 between the pin 24 and the pivot point 202 is located. This is the dead center or the dead center of the rocker 20. If the release force A presses in this position a little further clockwise, then pulls the force of the snap spring 30 to the right of the imaginary connection line 241, so that thereby further pivots the rocker in a clockwise direction and in their second stable position according to Fig. 2 snaps.
  • the rocker 20 In the second stable position, also called the second closed position, the rocker 20, the second contact point 12 is closed and the first Kunststoffste ! e 17 is open, wherein at the first contact point 17, the full contact distance is reached.
  • the second arm 22 of the rocker 20 presses the contact arm 18 against the restoring force of the contact pressure spring 60 down.
  • the contact pressure force at the second pad 12 is applied by the snap spring 30.
  • the second spring arm 52 of the function spring 50 is blocked by the actuating extension 41 of the shift key 40, so that it can no longer press on the stop 25 in the second closed position of the rocker 20.
  • the restoring forces of the contact pressure spring 60, the snap spring 30 and the release force A are coordinated so that the superposition of the release force A with the force K of the snap spring 30 is sufficient to keep the first contact point 17 against the restoring force of the contact pressure spring 60 open.
  • the magnitude of the restoring force of the contact pressure spring 60 can be adjusted with the adjusting member 70.
  • the counterclockwise pivoting is possible because the second spring arm 52 of the function spring 50 can no longer press on the stop 25 and thus the rocker 20 is released for pivoting back.
  • the snap back into the first stable position takes place automatically after elimination of the overcurrent. Therefore, the overcurrent relay 1 is in the in the FIGS. 1 and 2 shown depressed position of the shift key 40 in the automatic mode.
  • the restoring force of the contact pressure spring 60 can be adjusted so that it is neither too large, thereby opening the first contact point 17 would be prevented, nor too small, whereby an automatic reset of the rocker 20 could not be done.
  • FIGS. 1 and 2 show the overcurrent relay 1 in the "manual reset" mode.
  • the shift key 40 is now exposed, so that thereby a greater distance between the actuating extension 41 of the shift key 40 and the second spring arm 52 of the function spring 50 is, as in the operating mode "automatic” according to the FIGS. 1 and 2 with depressed shift key.
  • rocker 20 If the rocker 20 is to be set back into its first stable position from this position, a corresponding manual reset force M must be exerted on the rocker from the outside via a reset button, which forcibly pivots it counterclockwise over the dead center position, so that it can move from From there back to the first stable position can snap back.
  • the reset force M can for example be exerted on the first arm 23 of the rocker 20 via a suitable lever arrangement, as indicated by the arrow M in Fig. 4 indicated.
  • a suitable lever arrangement as indicated by the arrow M in Fig. 4 indicated.
  • the arrangement of an externally operable reset button or reset switch with an associated lever assembly for acting on the rocker in the manual reset operation is known in principle and should therefore not be shown here for the sake of clarity of illustration.
  • FIGS. 5 to 8 show an electrical overload relay 1 similar to that in the Figures 1 to 4 shown, with the difference that in the embodiment according to the FIGS. 5 to 8 the first and second contact points 17, 12 are each designed as a double contact point.
  • the first contact point 17 thus comprises two fixed contacts 151, which are conductively bridged when the contact point is closed via two movable contact pieces attached to a movable contact bridge 161.
  • an adjusting element for the contact pressure spring 60 is here an adjusting screw 701st
  • the second contact point 12 comprises two fixed contacts 101, which are conductively bridged when the contact point is closed via two movable contact pieces attached to a movable contact bridge 111.
  • the contact bridges 111, 161 can also be designed as so-called double contact bridges.
  • a double contact bridge connects two adjacent pairs of contacts, ie a total of 4 contacts, with each other.

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Abstract

L'invention concerne un relais pour surcharge, avec une bascule montée pivotante (20) qui est positionné sur au moins une pièce de contact mobile (11) d'un point de contact (12) et qui, en cas de surintensité, en raison de l'action d'un déclencheur thermique, passe d'une première position de fermeture à une deuxième position de fermeture, avec un dispositif d'inversion (40) pouvant passer d'une première position à une deuxième position pour le réarmement manuel ou automatique de la bascule entre la deuxième et la première position de fermeture, et a) la bascule est maintenue par un ressort de rappel dans sa première ou deuxième position de fermeture et peut commuter contre la forme de rappel du ressort de rappel en passant par une position de point mort, b) ,a bascule coopère avec un ressort fonctionnel afin que celui-ci assiste la bascule dans la commutation entre la première et la deuxième position de fermeture et c) le ressort fonctionnel, sous l'effet du dispositif de commutation, peut autoriser ou interdire le retour de la bascule entre la deuxième et la première position de fermeture.

Claims (9)

  1. Relais anti-surcharge (1) comprenant une bascule (20) montée de manière pivotante, sur laquelle est monté au moins un élément de contact mobile (11) d'un point de contact (12), la bascule (20), en cas de surintensité, passant d'une première position fermée à une deuxième position fermée en raison de l'effet d'un déclencheur thermique, et comprenant un dispositif d'inversion (40) qui peut être permuté entre une première et une deuxième position sur rappel manuel ou automatique de la bascule (20) de la deuxième vers la première position fermée, la bascule (20) étant maintenue par un ressort à déclic (30) dans sa première ou sa deuxième position fermée et pouvant sauter brusquement en contrant la force de rappel du ressort à déclic (30) sur une position de point mort entre les deux positions fermées, et un ressort fonctionnel (50) interagissant avec la bascule (20) de telle sorte que celui-ci assiste un saut brusque de la bascule (20) de la première vers la deuxième position fermée, caractérisé en ce que le ressort fonctionnel (50), sous l'influence du dispositif d'inversion (40), peut libérer ou bloquer un saut en arrière de la bascule (20) de la deuxième vers la première position fermée.
  2. Relais anti-surcharge (1) selon la revendication 1, caractérisé en ce que la bascule (20), dans sa première position fermée stable, pousse le ressort fonctionnel (50) contre la force de rappel dans une première position active dans laquelle le ressort fonctionnel (50), par sa force de rappel, sollicite la bascule (20) en direction de la deuxième position fermée.
  3. Relais anti-surcharge (1) selon la revendication 2, caractérisé en ce que le dispositif d'inversion (40) comprend un bouton-poussoir (40) qui, dans sa première position, est poussé vers le bas et maintient ainsi le ressort fonctionnel (50) dans une position intermédiaire dans laquelle celui-ci libère la bascule (20) dans la deuxième position fermée après avoir franchi la position de point mort en vue de son retour brusque dans la première position fermée.
  4. Relais anti-surcharge (1) selon la revendication 3, caractérisé en ce que le bouton-poussoir (40) libère le ressort fonctionnel (50) dans sa deuxième position, de sorte que celui-ci sollicite la bascule (20) même après avoir franchi sa position de point mort en direction de la deuxième position fermée.
  5. Relais anti-surcharge (1) selon l'une des revendications précédentes, caractérisé en ce qu'un premier bras de bascule (22) interagit avec un premier point de contact (17) et un deuxième bras de bascule (23) avec un deuxième point de contact (12), de sorte que dans la première position fermée de la bascule (20), le premier point de contact (17) est fermé et le deuxième point de contact (12) est ouvert et, dans la deuxième position fermée de la bascule (20), le premier point de contact (17) est ouvert et le deuxième point de contact (12) est fermé.
  6. Relais anti-surcharge (1) selon la revendication 5, caractérisé en ce qu'un premier cavalier de contact (161) est monté sur le premier bras de bascule (22) et un deuxième cavalier de contact (111) sur le deuxième bras de bascule (23) pour réaliser un pontage électriquement conducteur entre à chaque fois au moins deux éléments de contact fixes (151 ; 101).
  7. Relais anti-surcharge (1) selon la revendication 5, caractérisé en ce que la force de pression de contact au niveau du deuxième point de contact (12) dans la deuxième position fermée de la bascule (20) est appliquée par le ressort à déclic (30).
  8. Relais anti-surcharge (1) selon la revendication 5, caractérisé en ce que la force de pression de contact au niveau du premier point de contact (17) dans la première position fermée de la bascule (20) est appliquée par un ressort de compression de contact (60).
  9. Relais anti-surcharge (1) selon la revendication 8, caractérisé en ce qu'après la disparition de l'effet du déclencheur thermique, le pivotement en arrière de la bascule (20) depuis la deuxième position fermée dans la première position fermée en passant par la position de point mort est assisté par le ressort de compression de contact (60), de telle sorte qu'un saut en arrière de la bascule (20) de la deuxième vers la première position fermée puisse avoir lieu.
EP09744955A 2008-11-12 2009-10-21 Relais électrique pour surcharge avec une bascule montée pivotante Active EP2345056B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102008056998 2008-11-12
DE102009043780A DE102009043780B4 (de) 2008-11-12 2009-09-30 Elektrisches Überlastrelais mit einer schwenkbar gelagerten Wippe
PCT/EP2009/007524 WO2010054739A1 (fr) 2008-11-12 2009-10-21 Relais électrique pour surcharge avec une bascule montée pivotante

Publications (2)

Publication Number Publication Date
EP2345056A1 EP2345056A1 (fr) 2011-07-20
EP2345056B1 true EP2345056B1 (fr) 2012-08-08

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ID=42105333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09744955A Active EP2345056B1 (fr) 2008-11-12 2009-10-21 Relais électrique pour surcharge avec une bascule montée pivotante

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EP (1) EP2345056B1 (fr)
CN (1) CN102217023B (fr)
DE (1) DE102009043780B4 (fr)
WO (1) WO2010054739A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104795287B (zh) * 2015-04-30 2017-11-03 浙江天正电气股份有限公司 一种具有弹性储能组件的断路器
DE102017109426A1 (de) 2017-05-03 2018-11-08 Eaton Electrical Ip Gmbh & Co. Kg Sprungschalter mit einer stromführenden Sprungfeder, Verfahren zur Herstellung eines derartigen Sprungschalters sowie Überlastrelais und Ausgelöstmelder mit einem derartigen Sprungschalter

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3866156A (en) * 1973-12-26 1975-02-11 Bernard Dimarco Overload relay indicating means
FR2536905A1 (fr) * 1982-11-25 1984-06-01 Telemecanique Electrique Relais thermique
DE29917173U1 (de) 1999-09-30 2000-08-24 Abb Patent Gmbh Betätigungseinrichtung für ein elektrisches Überstromrelais
DE102005043655B4 (de) * 2005-09-13 2007-10-25 Siemens Ag Verfahren zum Betreiben eines elektrischen Schaltgerätes und nach diesem Verfahren betriebenes elektrsches Schaltgerät

Also Published As

Publication number Publication date
CN102217023A (zh) 2011-10-12
DE102009043780B4 (de) 2011-01-27
WO2010054739A1 (fr) 2010-05-20
EP2345056A1 (fr) 2011-07-20
CN102217023B (zh) 2014-02-12
DE102009043780A1 (de) 2010-05-20

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