EP2620971B1 - Unité de commutation pour un commutateur électrique et commutateur électrique - Google Patents

Unité de commutation pour un commutateur électrique et commutateur électrique Download PDF

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Publication number
EP2620971B1
EP2620971B1 EP12189892.8A EP12189892A EP2620971B1 EP 2620971 B1 EP2620971 B1 EP 2620971B1 EP 12189892 A EP12189892 A EP 12189892A EP 2620971 B1 EP2620971 B1 EP 2620971B1
Authority
EP
European Patent Office
Prior art keywords
pawl
switching unit
lever
spring
switching
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
EP12189892.8A
Other languages
German (de)
English (en)
Other versions
EP2620971A1 (fr
Inventor
Pavel Naiman
Milos Petracek
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
Publication of EP2620971A1 publication Critical patent/EP2620971A1/fr
Application granted granted Critical
Publication of EP2620971B1 publication Critical patent/EP2620971B1/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
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • 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
    • H01H71/505—Latching devices between operating and release mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/36—Driving mechanisms
    • H01H21/40—Driving mechanisms having snap action
    • H01H21/42—Driving mechanisms having snap action produced by compression or extension of coil spring
    • 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
    • H01H5/08—Energy stored by deformation of elastic members by compression or extension of coil springs one end of spring transmitting movement to the contact member when the other end is moved by the operating part

Definitions

  • the invention relates to an electrical switching device, in particular a circuit breaker, such as a molded case circuit breaker.
  • circuit breakers have the task of decoupling one or a number of consumers from a power supply network when a specific fault occurs.
  • the classic fault is the occurrence of a short-circuit current, and the circuit breakers are conventionally designed to move a switching unit in such a short-circuit current and thus to decouple the connection between consumers and the power supply network.
  • the switching unit of the electrical switching device After triggering of such an electrical switching device, the switching unit of the electrical switching device is reset. This means that the switching unit is moved by means of a pivot lever from a TRIP position to a RESET position. This reset operation is part of a switching operation of an electrical switching device and it is therefore necessary after a triggering of the switching device to reset the switching device by a reset operation to then turn it on.
  • One of the main problems during the reset operation is the friction of components of the switching unit, in particular between the surfaces of the triggering mechanism, in particular the triggering shaft, and the pawl, during the reset operation, that is the movement of the switching unit from the TRIP position to the RESET position to be in contact with each other.
  • the friction between the pawl and the triggering mechanism is too great, it may happen that the pawl does not slide off the contact surface of the triggering mechanism and therefore can not pivot.
  • the pawl is not movable or resettable and the electrical switching device, such as a molded case circuit breaker can not be turned on after the reset process.
  • the switching unit is not reset properly (reset), so that during the subsequent switching on the electrical switching device or the switching unit of the electrical switching device, the pawl the clamping lever The switching unit can not be held in the RESET position and therefore the switching unit is not transferred to the ON position, but to the TRIP position.
  • Fig. 1 schematically shows a part of the switching unit of this known circuit breaker.
  • Fig. 1 is the circuit breaker tripped, that is located in the TRIP position.
  • An operator of the circuit breaker can reset the switching unit of the circuit breaker by pressing the clamping lever 5 (reset).
  • the switching unit has a pawl 2 and a triggering mechanism 1.
  • the pawl 2 and the trigger mechanism 1 are pivotally mounted, for example rotatably on a side wall 10 of the circuit breaker. Between the pawl 2 and the trigger mechanism 1, a pawl spring 9 is tensioned, the required torque on the pawl second and also on the triggering mechanism 1 exercises.
  • the force exerted by the pawl spring 9 or the force exerted by the pawl spring 9 generates between the trigger mechanism 1 and the pawl 2 contact forces and frictional forces. During the reset process, it must be ensured that the frictional forces between the pawl 2 and the release mechanism 1 do not prevent pivoting or twisting of the pawl 2 in the direction of the tensioning lever 5 of the shifting unit.
  • the pawl 2 has to pivot or rotate in order to jump on the tensioning lever 5.
  • spring elements in particular also the pawl spring 9, generate the switching unit a torque which pivots the tensioning lever 5, so that the tensioning lever 5, in particular the contact surface 7 of the tensioning lever 5, in Contact with the pawl 2, that is, the contact surface 8 of the pawl 2, device.
  • the pawl 2 pivots and is stopped in the RESET position by the contact surface 6 of the trigger mechanism 1. After reaching the RESET position of the switching unit of the circuit breaker can be turned on.
  • a disadvantage of the mode-3VT1 circuit breaker is that additional elements, such as the hook 3 of the triggering mechanism 1 and the curved portion 11 of the pawl 2, are required to ensure the functionality of the switching unit.
  • additional elements are costly.
  • more material is required, on the other hand, these elements must be manufactured with high precision and calibrated to each other to ensure the functionality of the switching unit and thus of the circuit breaker, in particular the reset operation of the switching unit of the circuit breaker.
  • DE-A-102007044475 discloses a shifting mechanism having a sub-shaft and a ratchet lever swingably fixed to the sub-shaft. At the end of the ratchet lever is a roller which is rotatably fixed to a leading end of the ratchet lever and makes contact with a pawl.
  • the locking lever In a state in which the switching device operating state is shifted from the closed state to the open state, the locking lever is pulled to allow the pawl to rotate in the opposite direction to the biasing direction of the pawl return spring to release contact of the pawl, which is the opening spring causes their energy to release, to spin the secondary shaft.
  • Such a trained switching unit for an electrical switching device in particular for a circuit breaker is simple and inexpensive to produce and allows a simple and safe resetting (resetting) of the electrical switching device.
  • the special design of the switching unit prevents that occurring by friction forces between the pawl and the trigger mechanism of the reset operation of the switching unit and thus the electrical switching device can not be performed.
  • the special design of the pawl and the pawl spring of the switching unit ensures that during the reset process, that is, the pivoting of the shift lever from the TRIP position to the RESET position, an additional torque exerted by the pawl spring on the pawl and on the trigger mechanism is, wherein the additional torque by the deflection of the pawl spring by a side surface of the pawl, which is in contact with the spring, when the reset operation is performed.
  • Additional force or additional torque means that the bending of the pawl spring another force is exerted by the pawl spring on the pawl or the trigger mechanism, the normal force of the pawl spring, that is, the force exerted by the pawl spring on the pawl or on the trigger mechanism if this is not bent, but only braced, supported.
  • the switching unit according to the invention can provide an at least equal force for triggering the switching unit but a greater force to turn the latch during the reset process.
  • the switching unit according to the invention can provide an at least equal force for triggering the switching unit but a greater force to turn the latch during the reset process.
  • no new or additional elements on the pawl and on the trigger mechanism are required compared to the described prior art. Only the arrangement of the pawl spring to the pawl is such that the pawl spring at a certain movement of the pawl it comes into contact, so that the pawl spring is bent by the pawl.
  • the latch spring can be designed in various ways. Particularly preferred is a switching unit in which the pawl spring is designed as a tension spring.
  • a first end of the pawl spring is arranged on the side of the pawl on which the pawl is pivotally or rotatably mounted with a side wall of the switching unit.
  • the second end of the tension spring designed as a pawl spring is on the trigger mechanism, which is in particular a triggering shaft arranged.
  • the trained as a tension spring latch spring can have English or German fastening hooks.
  • the diameter of the trained as a tension spring pawl spring is sized so large that during the movement of the shift lever from the ON position to the TRIP position and / or from the TRIP Position in the RESET position, the pawl spring is bent by the contact with the side surface of the pawl.
  • the part of the turns of the tension spring comes into contact with the side face of the pawl, which faces the first end of the pawl spring.
  • the trigger contact surface of the trigger mechanism is disposed on a projection of the trigger mechanism and the pawl contact surface of the pawl is formed by a recess, in particular a recess in the pawl, wherein in the TRIP position the trigger contact surface of the trigger mechanism at least partially frictionally abuts the pawl contact surface of the pawl.
  • the triggering mechanism advantageously has a rotatable around a rotational axis of the trigger mechanism body on which the projection is arranged.
  • the latch contact surface is formed by a depression, particularly preferably by a recess, in particular a polygonal recess in the latch.
  • the latch contact surface is advantageously inclined, in particular inclined by 90 °, to the longitudinal extension of the pawl formed on this.
  • the trigger contact surface of the projection of the trigger mechanism is at least partially frictionally engaged with the pawl contact surface of the pawl.
  • the frictional engagement is caused by the bias of the pawl spring in this TRIP position.
  • the deflection of the pawl spring in the TRIP position ensures that when the shift lever is moved from the TRIP position to the RESET position, ie during a reset operation of the switch unit, the pawl contact surface and the trip contact surface slide away from each other Release the triggering mechanism. This is supported by the additional force exerted by the deflection of the pawl spring.
  • the object is achieved by an electrical switching device which has at least one switching unit according to the first aspect of the invention.
  • the electrical switching device is a power switch, in particular a molded case circuit breaker.
  • Circuit breakers are in particular electromagnetic self-switches. In particular, they can be used as circuit breakers to protect circuits against short circuit and / or overload be used. A use as a motor protection switch is widespread. Due to the design of the electrical switching device as a circuit breaker, in particular as a molded case circuit breaker, the electrical switching device can be used in a wide range of electrical applications.
  • Fig. 1 a switching unit of Modeion 3VT1 circuit breaker Siemens AG represented, which represents the state of the art to the switching unit according to the invention.
  • Fig. 2 shows schematically in a sectional view a part of a switching unit 20, which is formed according to the inventive design principle.
  • the switching unit 20 can in an electrical switching device, in particular in a circuit breaker, such as a molded case circuit breaker, are used.
  • the switching unit 20 has a switching mechanism for connecting and disconnecting at least one moving contact of at least one fixed contact of an electrical switching device.
  • the switching mechanism has a clamping lever 25 rotatably mounted about a fixed clamping lever axis, a rocking lever 24 movably mounted on the clamping lever 25, and a hinge mechanism for moving the moving contact.
  • the tensioning lever 25 is for the movement of the movement contact via the hinge mechanism, which is not shown in detail, with this in operative connection.
  • the mounting of the clamping lever 25 may be provided at the end of the clamping lever 25, not shown, or in a central region of the clamping lever 25.
  • the switching unit has a pawl 22 for locking and unlocking the clamping lever 25. That is, the pawl 22 serves to cooperate with the cocking lever 25 to hold it in the ON position.
  • the switching unit comprises a switchable about a stationary bearing axis shift lever 32 for manually connecting and disconnecting the moving contact via the switching mechanism, wherein the shift lever between an OFF position and an ON position manually and a TRIP position T and a RESET position R manually or is automatically swiveled.
  • the shift lever may be gripped by an operator of the electrical switching device to manually switch the shift lever between an OFF and an ON position.
  • the shift lever 32 may be gripped by an operator to transfer the shift lever 32 from a TRIP position T to the RESET position R to reset the shift unit 20.
  • the switching unit has a tension roller 33 which can be driven via the shift lever 32 such that upon movement of the shift lever 32, the tension roller 33 by rolling along a clamping contour 34 of the clamping lever 25 with the clamping lever 25 for pivoting the clamping lever 25 in operative contact stands. That is, at the clamping contour 34th of the clamping lever 25 is a tension roller 33, which can be driven via the shift lever 32 such that during a movement of the shift lever 32, the tension roller 33 rolls on the clamping contour 34 of the clamping lever 25 and thereby pivots.
  • the tension roller 33 is rotatably mounted on the shift lever 32.
  • a clamping element in particular a spring, the switching mechanism, which is not shown, stretched or relaxed. That is, depending on the direction in which the tension roller 33 rolls along the tensioning curve 34 of the tensioning lever 24, the tensioning element is tensioned or relaxed.
  • the switching unit furthermore has a triggering mechanism 21 rotatably mounted about an axis of rotation, which is releasably in operative contact via at least one triggering contact surface 26 with a pawl contact surface 28 of the pawl 22 in the TRIP position T of the switching unit 20.
  • the pawl spring 29 of the switching unit 20 is disposed between the pawl 22 and the triggering mechanism 21, which is also referred to as a drop lock.
  • TRIP position T of the switching unit 20 the trained as a tension spring pawl spring 29 is pulled apart so that this clamps the pawl 22 and the trigger mechanism 21 with each other.
  • the pawl 22 and the pawl spring 29 are formed such that upon movement of the shift lever 32 from the ON position to the TRIP position T, the pawl spring 29 is bent by contact with a side surface 37 of the pawl 22. This is in Fig. 2 shown.
  • One area of the tension spring designed as a pawl spring 29 is due to the relative movement of the pawl spring 29 to the pawl 22 on a side surface 37 of the pawl 22, whereby the pawl spring 29 is bent.
  • the bent pawl spring 29 exerts a force F on the pawl 22 or exerts a torque on the pawl 22, which in addition to the normal clamping force of the pawl spring 29 ensures that in a reset operation that is at the transition of the switching unit 20 of the TRIP Position T in the RESET position R, which is in Fig. 3 is exercised.
  • This additional force exerted by the bending of the pawl spring 29 on the pawl 22 and the trigger mechanism 21 it is ensured that the trigger contact surface 26 of the trigger mechanism 21 and the pawl contact surface 28 of the pawl 22 during the reset process safely slide from each other.
  • Fig. 2 the switching unit 20 of the electrical switching device is triggered.
  • an operator of the switching unit 20 or of the electrical switching device pivots the shift lever 22. In this case, he controls the tension of the tensioning lever 25.
  • the pawl spring 29 is tensioned in the TRIP position T. required torque for the pawl 22 and also for the triggering mechanism 21 in certain directions. The torque of the pawl spring 29 generates between the pawl 22 and the triggering mechanism 21 certain contact forces or frictional forces.
  • the rocker arm 24 of the switching unit 20 is movable relative to the clamping lever 25 in a slotted guide 35 and on a bearing element 36.
  • the embodiment of the switching unit 20 described above describes the present invention by way of example only. Of course, other embodiments of the switching unit 20 are conceivable.

Landscapes

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

Claims (7)

  1. Unité de commutation (20) pour un commutateur électrique, notamment un disjoncteur, comprenant
    - un mécanisme de commutation destiné à relier et séparer au moins un contact mobile d'au moins un contact fixe du commutateur électrique, qui comporte un levier tendeur (25) monté à rotation autour d'un axe fixe de levier tendeur, au moins un levier basculant (24) monté mobile sur le levier tendeur (25) et un mécanisme articulé servant à déplacer le contact mobile, lequel levier tendeur (25), de manière à déplacer le contact mobile par l'intermédiaire du mécanisme articulé, est en liaison active avec celui-ci,
    - un cliquet (22) destiné à verrouiller et déverrouiller le levier tendeur (25),
    - un levier de commutation (32) pivotant autour d'un axe de support fixe et destiné à relier et séparer manuellement le contact mobile par l'intermédiaire du mécanisme de commutation, lequel levier de commutation (32) peut être pivoté, manuellement, entre une position OFF et une position ON et, manuellement ou automatiquement, entre une position TRIP (T) et une position RESET (R),
    - un galet tendeur (33) qui peut être entraîné par le levier de commutation (32) de sorte que lors d'un mouvement du levier de commutation (32), le galet tendeur (33), en roulant le long d'un contour (34) du levier tendeur (25), se trouve en contact actif avec le levier tendeur (25) pour faire pivoter le levier tendeur (25) ;
    - un mécanisme de déclenchement (21) qui est monté à rotation autour d'un axe de rotation et qui, par au moins une surface de contact (26) du mécanisme de déclenchement (21), de façon détachable, se trouve en contact actif avec une surface de contact (28) du cliquet (22) en position TRIP (T) de l'unité de commutation (20),
    - un ressort de cliquet (29) qui est disposé entre le cliquet (22) et le mécanisme de déclenchement (21) et qui, au moins en position TRIP (T), serre l'un contre l'autre le cliquet (22) et le mécanisme de déclenchement (21),
    caractérisée en ce que
    le cliquet (22) et le ressort de cliquet (29) sont conçus de telle façon que lorsque le levier de commutation (32) se déplace de la position ON dans la position TRIP (T) et/ou de la position TRIP (T) dans la position RESET (R), le ressort de cliquet (29) se déforme par suite de contact avec une surface latérale (37) du cliquet (22).
  2. Unité de commutation (20) selon la revendication 1,
    caractérisée en ce que
    le ressort de cliquet (29) est réalisé sous forme de ressort de traction.
  3. Unité de commutation (20) selon la revendication 2,
    caractérisée en ce que
    le diamètre du ressort de cliquet (29) réalisé sous forme de ressort de traction est dimensionné de telle sorte que lorsque le levier de commutation (32) se déplace de la position ON dans la position TRIP (T) et/ou de la position TRIP (T) dans la position RESET (R), le ressort de cliquet (29) se déforme par suite de contact avec la surface latérale (37) du cliquet (22).
  4. Unité de commutation (20) selon au moins l'une des revendications précédentes,
    caractérisée en ce que
    une première extrémité (38) du ressort de cliquet (29) est en prise sur le côté du cliquet (22) où le cliquet (22) est monté avec mobilité pivotante ou rotative sur une paroi latérale (30) de l'unité de commutation (20).
  5. Unité de commutation (20) selon au moins l'une des revendications précédentes,
    caractérisée en ce que
    la surface de contact (26) du mécanisme de déclenchement (21) est agencée sur une saillie (39) du mécanisme de déclenchement (21) et en ce que la surface de contact (28) du cliquet (22) est formée par un renfoncement (40), en particulier un évidement, ménagé dans le cliquet (22), sachant qu'en position TRIP, la surface de contact (26) du mécanisme de déclenchement (21) est au moins partiellement en contact par friction avec la surface de contact (28) du cliquet (22).
  6. Commutateur électrique, comportant au moins une unité de commutation selon l'une des revendications précédentes.
  7. Commutateur électrique selon la revendication 6, caractérisé en ce que le commutateur électrique est un disjoncteur, en particulier un disjoncteur compact.
EP12189892.8A 2012-01-30 2012-10-25 Unité de commutation pour un commutateur électrique et commutateur électrique Active EP2620971B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012201260A DE102012201260A1 (de) 2012-01-30 2012-01-30 Schalteinheit für ein elektrisches Schaltgerät sowie elektrisches Schaltgerät

Publications (2)

Publication Number Publication Date
EP2620971A1 EP2620971A1 (fr) 2013-07-31
EP2620971B1 true EP2620971B1 (fr) 2015-02-25

Family

ID=47143572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12189892.8A Active EP2620971B1 (fr) 2012-01-30 2012-10-25 Unité de commutation pour un commutateur électrique et commutateur électrique

Country Status (4)

Country Link
US (1) US9275811B2 (fr)
EP (1) EP2620971B1 (fr)
CN (1) CN103227079B (fr)
DE (1) DE102012201260A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2998413B1 (fr) * 2012-11-21 2016-02-05 Alstom Technology Ltd Dispositif de commande a ressort pour un disjoncteur
DE102019209747B3 (de) 2019-07-03 2020-10-08 Ellenberger & Poensgen Gmbh Schutzschalter

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
US4146765A (en) * 1976-10-22 1979-03-27 Gould Inc. Circuit breaker closing mechanism
DE3114717C2 (de) * 1981-04-11 1987-04-30 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Unterspannungsauslöser für einen Leitungsschutzschalter
KR880014610A (ko) * 1987-05-18 1988-12-24 시키 모리야 회로 차단기
DE3717733C1 (en) * 1987-05-26 1988-06-01 Geyer Gmbh & Co Christian Mechanism for automatic circuit breakers
US4789848A (en) * 1987-09-03 1988-12-06 General Electric Company Molded case circuit breaker latch and operating mechanism assembly
DE3829301A1 (de) * 1988-08-30 1990-04-26 Bsg Schalttechnik Schalter zur montage auf schaltplatte
DE4336480C2 (de) * 1993-10-26 1995-11-02 Felten & Guilleaume Energie Schaltmechanik für elektrische Schutzschaltgeräte
DE19703972C1 (de) * 1997-02-03 1998-05-14 Siemens Ag Schaltschloß eines Schaltgeräts
DE19802189C1 (de) * 1998-01-16 1999-05-06 Siemens Ag Schaltgetriebe eines elektrischen Schalters
JP4881117B2 (ja) 2006-09-29 2012-02-22 株式会社東芝 開閉装置および開閉装置操作機構
US7449653B2 (en) * 2007-03-29 2008-11-11 Eaton Corporation Positive resetting close latch for closing electrical switching apparatus
US7459650B2 (en) * 2007-04-19 2008-12-02 Eaton Corporation Electrical switching apparatus, and latch assembly and latch engagement control mechanism therefor
US7800007B2 (en) * 2007-06-26 2010-09-21 General Electric Company Circuit breaker subassembly apparatus
KR101015296B1 (ko) * 2008-12-31 2011-02-15 엘에스산전 주식회사 캠 회전 지연기능을 구비한 회로차단기
JP4760998B1 (ja) * 2010-10-12 2011-08-31 オムロン株式会社 スイッチ

Also Published As

Publication number Publication date
CN103227079A (zh) 2013-07-31
US20130192966A1 (en) 2013-08-01
DE102012201260A1 (de) 2013-08-01
EP2620971A1 (fr) 2013-07-31
US9275811B2 (en) 2016-03-01
CN103227079B (zh) 2016-05-04

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