EP2755222B1 - Mécanisme de verrouillage pour appareils de protection basse tension - Google Patents

Mécanisme de verrouillage pour appareils de protection basse tension Download PDF

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Publication number
EP2755222B1
EP2755222B1 EP13151144.6A EP13151144A EP2755222B1 EP 2755222 B1 EP2755222 B1 EP 2755222B1 EP 13151144 A EP13151144 A EP 13151144A EP 2755222 B1 EP2755222 B1 EP 2755222B1
Authority
EP
European Patent Office
Prior art keywords
spring
handle
latching mechanism
protection device
torque
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
EP13151144.6A
Other languages
German (de)
English (en)
Other versions
EP2755222A1 (fr
Inventor
Ludwig Niebler
Alexander Zhukowski
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP13151144.6A priority Critical patent/EP2755222B1/fr
Priority to PCT/EP2013/075040 priority patent/WO2014108248A1/fr
Publication of EP2755222A1 publication Critical patent/EP2755222A1/fr
Application granted granted Critical
Publication of EP2755222B1 publication Critical patent/EP2755222B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/56Manual reset mechanisms which may be also used for manual release actuated by rotatable knob or wheel
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/50Manual reset mechanisms which may be also used for manual release
    • H01H71/52Manual reset mechanisms which may be also used for manual release actuated by lever

Definitions

  • the invention relates to a switch lock, in particular for low-voltage protection devices with a knee joint, which comprises a handle and a first U-bracket attached thereto, wherein in the handle a spring element is arranged and wherein the first U-bracket is mechanically in operative connection with a pawl, which mechanically operatively connected to a shift lever via a second U-bracket, as well as a protective device.
  • the protective device When the protective device is switched on, at least one switch-off spring is preloaded in the switch lock.
  • the protective device is designed so that current monitoring groups such as bimetal triggers, continuously measure the flow of current in a branch line. If the current flow exceeds a defined threshold value, the opening spring, which is pre-tensioned in the switch lock, is unlatched. The unlatched spring force is transmitted to the main contacts via the switch lock mechanism, which are then opened. As a result, the flow of current is interrupted.
  • current monitoring groups such as bimetal triggers
  • a low-voltage protection device In practical use, a low-voltage protection device has a rather passive task, that is, it is switched on once after installation in a control cabinet and remains in this state until a system failure occurs. But since a system failure occurs very rarely, it is common that the switching mechanism in the low-voltage protection device is not operated for decades. There is therefore the risk that components in the switch lock will fail unnoticed due to aging and the protective device will no longer function. In particular, the biased opening springs constitute a potential hazard. For example, hydrogen embrittled feathers in new condition show no abnormalities, but tend, with appropriate bias to break after months.
  • circuit breakers in safety-related controls as a redundant switching element to a contactor in order to achieve a higher safety integrity level.
  • a circuit is on a contactor on and off.
  • the contactor is monitored by a safety evaluation device. If a switch-off fails, the circuit-breaker is triggered or switched off via an undervoltage release. Since a circuit breaker usually has to be switched on manually, an automatic monitoring of the circuit breaker is very expensive. For this reason, such circuits are only interesting in applications that require a low switching frequency operationally.
  • the WO 2004/073008 A1 describes a switch lock with a knee joint, which comprises a handle with a first attached thereto U-bracket 1, wherein in the handle a spring element is arranged and wherein the first U-Büge1 mechanically in operative connection with a pawl, which via a second U-büge1 mechanically in operative connection with a shift lever.
  • the DE 197 03 959 C1 describes a switching mechanism of a switching device with rotary drive.
  • the switch lock has a counter-wheel, which forms a knee joint in conjunction with a U-bracket1.
  • the knee joint is in a backdrop in one Circuit board led.
  • Other attached to the circuit board components of the switch latch are a latch lever, a pawl, a lever, a switch-off spring and a lock.
  • the object of the present invention is to provide a switch lock, in particular for low-voltage protection devices and a corresponding protection device, which works reliably and minimizes the risk of unrecognized material defects.
  • a switch lock in particular for low-voltage protective devices with a knee joint, which comprises a handle and a first U-bracket attached thereto, wherein in the handle a spring element is arranged and wherein the first U-bracket mechanically in operative connection with a pawl is, which is mechanically connected via a second U-bracket with a shift lever.
  • the invention is characterized in that the spring element in the handle is designed such that the knee joint remains stretched under load with a plurality of opening springs, but moves under load with only one opening spring in the off position.
  • the invention also includes a protective device with a switch lock according to the invention.
  • the switching mechanism according to the invention has a knee joint, which comprises a handle, which is preferably designed as a toothed rocker, and a first U-bracket, wherein in the handle a spring element, preferably a torsion spring, is arranged.
  • the U-bracket has two legs, which are arranged on the one hand in the handle and the other in a pawl.
  • a second U-bracket is arranged, which connects the pawl mechanically with the shift lever. This switching mechanism is arranged between two circuit boards.
  • the switching mechanism according to the invention a plurality, in particular at least two Ausschaltfedern on.
  • the first opening spring is preferably designed as a torsion spring, with two ends, wherein the one end is attached to the shift lever and the other end to a first extension of a circuit board.
  • the second opening spring is preferably designed as a tension spring and also has two ends, wherein the one end is attached to a second extension of a circuit board and the other end to the shift lever.
  • a stop is provided in the housing.
  • the force “F” comes from a prestressed opening spring, which is tensioned during the switch-on process, and whose force is transmitted via several mechanical parts to the upper U-bar.
  • the torque “Ma” acts clockwise in the switched position on the shift lever.
  • the feature essential to the invention is that at least two opening springs are provided in the switching mechanism with knee joint. These may be, for example, a tension spring and a torsion spring.
  • F F mainspring + F torsion spring respectively
  • F F 1 + F 2
  • F tension spring corresponds to the force acting on the upper, first U-bracket, which originates from a tension spring located somewhere in the transmission.
  • F torsion corresponds to the force acting on the upper, former U-bracket, which originates from a torsion spring located somewhere in the transmission.
  • Each individual opening spring is dimensioned in terms of power so that it can open the main contacts alone a small piece.
  • the opening travel which can be achieved by a switch-off spring, is so great that at rated voltage, a current flow through the main contacts comes to a standstill.
  • the effect of the return spring in the toothed rocker (“Mdf") is so dimensioned so that the knee joint remains stretched when loaded with two Ausschaltfedern, but is moved when loaded with only one opening spring in the off position counterclockwise.
  • the invention is characterized in that the effect of the return spring in the handle, so in the toothed rocker is dimensioned so that the knee joint under load with two opening springs remains stretched, but is moved under load with only one opening spring in the off position.
  • the advantage is that when a break-off spring breaks in the switch lock, the low-voltage protection device switches off automatically. The plant comes to a standstill and the fault is detected even before a dangerous situation occurs.
  • the low-voltage protection device is preferably a circuit breaker or a motor branch.
  • the handle is designed as a toothed rocker.
  • the spring element is designed as a torsion spring.
  • the first opening spring is designed as a torsion spring.
  • the first opening spring has two ends, wherein the one end is fastened to the shift lever and the other end to a first extension of a circuit board.
  • a second opening spring is designed as a tension spring. It is inventively provided that the second opening spring has two ends, wherein one end is attached to a second extension of a circuit board and the other end on the shift lever.
  • the invention also includes a protective device, in particular a low-voltage protection device, with a switching mechanism according to the invention.
  • the switching mechanism according to the invention is characterized in that the action of the return spring in the handle is dimensioned so that the knee joint is stretched under load with two opening springs, but is moved under load with only one opening spring in the off position.
  • This concept according to the invention has the advantage that when a break-off spring breaks in the switching mechanism, the low-voltage protection device switches off automatically. The plant comes to a halt and the fault is detected even before a dangerous situation occurs.
  • the switching mechanism according to the invention thus enables reliable operation and minimizes the risk of unrecognized material defects.
  • Fig. 1 shows the switching mechanism 1 according to the invention, which has a knee joint, which comprises a handle 2, which is preferably designed as a toothed rocker, and a first U-bracket 3, wherein in the handle 2, a spring element 4, preferably a torsion spring is arranged.
  • the U-bracket 3 has two legs 5, 6, which are arranged on the one hand in the handle 2 and on the other hand in a pawl 7.
  • a second U-bracket 8 is arranged, which connects the pawl 7 mechanically with a shift lever 9.
  • the spring element 4 acts on the handle 2 with the torque "Mdf" in the counterclockwise direction.
  • Fig. 2 is the switching mechanism 1 according to the invention in the installed state between two circuit boards 10, 11 shown.
  • the switching mechanism according to the invention a plurality, in particular at least two Ausschaltfedern 12, 13 has.
  • the first opening spring 12 is preferably designed as a torsion spring with two ends, wherein one end is attached to the shift lever 9 and the other end to a first extension 14 of the circuit board 11.
  • the second opening spring 13 is preferably designed as a tension spring and also has two ends, wherein one end is attached to a second extension 15 of the circuit board 11 and the other end to the shift lever 9.
  • the feature essential to the invention is that at least two opening springs are provided in the switching mechanism with knee joint.
  • This can be for example a To be tension spring and a torsion spring.
  • F F mainspring + F torsion spring respectively
  • F F 1 + F 2
  • tension spring corresponds to the force acting on the upper, first U-bracket, which originates from a tension spring located somewhere in the transmission.
  • F torsion corresponds to the force acting on the upper, former U-bracket, which originates from a torsion spring located somewhere in the transmission.
  • Each individual opening spring is dimensioned in terms of power so that it can open the main contacts alone a small piece.
  • the opening travel which can be achieved by a switch-off spring, is so great that at rated voltage, a current flow through the main contacts comes to a standstill.
  • the action of the return spring in the toothed rocker (“MDF”) is dimensioned so that the knee joint remains stretched under load with two opening springs, but is moved in the off position counterclockwise when loaded with only one opening spring.
  • the invention is characterized in that the effect of the return spring in the handle, so in the toothed rocker is dimensioned so that the knee joint under load with two opening springs remains stretched, but is moved under load with only one opening spring in the off position.
  • the advantage is that when a break-off spring breaks in the switch lock, the low-voltage protection device switches off automatically. The plant comes to a standstill and the fault is detected even before a dangerous situation occurs.
  • the switch lock according to the invention enables reliable operation and minimizes the risk of unrecognized material defects.

Landscapes

  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Claims (10)

  1. Mécanisme de verrouillage (1) notamment pour appareils de protection basse tension avec une genouillère qui comprend une manette (2) à laquelle est fixé un premier étrier en U (3), un élément élastique (4) étant agencé dans la manette (2) et le premier étrier en U (3) étant en interaction mécanique avec un cliquet (7), lequel est en interaction mécanique avec un levier de commande (9) par l'intermédiaire d'un deuxième étrier en U (8), caractérisé en ce que l'élément élastique (4) est réalisé dans la manette (2) de telle manière que la genouillère reste tendue lorsqu'elle est sollicitée par une pluralité de ressorts de coupure (12, 13), mais se met en position de coupure lorsqu'elle est sollicitée par un seul ressort de coupure (12 ou 13), la force de chaque ressort de coupure (12, 13) étant dimensionnée de telle sorte qu'il parvient seul à ouvrir un peu les contacts principaux, et dans la position de commutation enclenchée l'élément élastique (4) appliquant à la manette (2) un premier couple ("Mdf") et audit premier couple étant opposé un deuxième couple avec un bras de levier ("H") et une force ("F"), et dans la position de commutation enclenchée ledit deuxième couple ("F"x"H") étant supérieur au premier couple ("Mdf").
  2. Mécanisme de verrouillage (1) selon la revendication 1, caractérisé en ce que la manette (2) est réalisé sous forme de bascule dentée.
  3. Mécanisme de verrouillage (1) selon la revendication 1 ou 2, caractérisé en ce que l'élément élastique (4) est réalisé sous forme de ressort de torsion.
  4. Mécanisme de verrouillage (1) selon l'une des revendications précédentes, caractérisé en ce qu'un premier ressort de coupure (12) est réalisé sous forme de ressort de torsion.
  5. Mécanisme de verrouillage (1) selon la revendication 4, caractérisé en ce que le premier ressort de coupure (12) présente deux extrémités, l'une des extrémités étant fixée au levier de commande (9) et l'autre extrémité à un premier prolongement (14) sur une plaquette de circuit imprimé (11).
  6. Mécanisme de verrouillage (1) selon l'une des revendications précédentes, caractérisé en ce qu'un deuxième ressort de coupure (13) est réalisé sous forme de ressort de traction.
  7. Mécanisme de verrouillage (1) selon la revendication 6, caractérisé en ce que le deuxième ressort de coupure (13) présente deux extrémités, l'une des extrémités étant fixée à un deuxième prolongement (15) d'une plaquette de circuit imprimé (11) et l'autre extrémité au levier de commande (9).
  8. Appareil de protection, notamment appareil de protection basse tension doté d'un mécanisme de verrouillage selon l'une des revendications 1 à 7.
  9. Appareil de protection selon la revendication 8, caractérisé en ce que l'appareil de protection basse tension est un disjoncteur.
  10. Appareil de protection selon la revendication 8, caractérisé en ce que l'appareil de protection basse tension est un branchement de moteur.
EP13151144.6A 2013-01-14 2013-01-14 Mécanisme de verrouillage pour appareils de protection basse tension Active EP2755222B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP13151144.6A EP2755222B1 (fr) 2013-01-14 2013-01-14 Mécanisme de verrouillage pour appareils de protection basse tension
PCT/EP2013/075040 WO2014108248A1 (fr) 2013-01-14 2013-11-29 Verrouillage de connexion destiné à un appareil de protection basse tension

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13151144.6A EP2755222B1 (fr) 2013-01-14 2013-01-14 Mécanisme de verrouillage pour appareils de protection basse tension

Publications (2)

Publication Number Publication Date
EP2755222A1 EP2755222A1 (fr) 2014-07-16
EP2755222B1 true EP2755222B1 (fr) 2016-03-23

Family

ID=47563210

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13151144.6A Active EP2755222B1 (fr) 2013-01-14 2013-01-14 Mécanisme de verrouillage pour appareils de protection basse tension

Country Status (2)

Country Link
EP (1) EP2755222B1 (fr)
WO (1) WO2014108248A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015213032B4 (de) 2015-07-13 2022-04-21 Siemens Aktiengesellschaft Schaltschloss für Niederspannungsschutzgeräte und Leistungsschalter mit einem Schaltschloss

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE468987C (de) * 1925-01-31 1928-12-04 Otto Dreyer Dipl Ing Selbstschalter mit Freiausloesung
DE652199C (de) * 1932-03-20 1937-10-27 Siemens Schuckertwerke Akt Ges Antrieb fuer Fluessigkeitsschalter mit Lichtbogenloeschung durch den beim Abschalten entwickelten Dampf, insbesondere fuer Expansionsschalter
DE722734C (de) * 1939-05-17 1942-07-20 Stotz Kontakt Gmbh Installations-Schalter mit Kippschaltwerk
GB1131785A (en) * 1966-04-05 1968-10-30 Square D Co Current responsive electric switch
DE19703959C1 (de) * 1997-02-03 1998-04-23 Siemens Ag Schaltgerät mit Tripped-Stellung des Schaltschlosses
DE29701829U1 (de) * 1997-02-03 1997-04-10 Siemens AG, 80333 München Schaltgerät mit Drehantrieb
DE10306319B3 (de) * 2003-02-14 2004-11-04 Siemens Ag Elektromechanischer Leistungsschalter

Also Published As

Publication number Publication date
EP2755222A1 (fr) 2014-07-16
WO2014108248A1 (fr) 2014-07-17

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