EP0518791B1 - Elektromagnetischer Auslöser mit Schlagbolzen - Google Patents

Elektromagnetischer Auslöser mit Schlagbolzen Download PDF

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Publication number
EP0518791B1
EP0518791B1 EP19920420196 EP92420196A EP0518791B1 EP 0518791 B1 EP0518791 B1 EP 0518791B1 EP 19920420196 EP19920420196 EP 19920420196 EP 92420196 A EP92420196 A EP 92420196A EP 0518791 B1 EP0518791 B1 EP 0518791B1
Authority
EP
European Patent Office
Prior art keywords
trip device
core
electromagnetic trip
rod
fixed core
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
EP19920420196
Other languages
English (en)
French (fr)
Other versions
EP0518791A1 (de
Inventor
Alain Frolla
Olivier Dardare
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.)
Schneider Electric SE
Original Assignee
Schneider Electric SE
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 Schneider Electric SE filed Critical Schneider Electric SE
Publication of EP0518791A1 publication Critical patent/EP0518791A1/de
Application granted granted Critical
Publication of EP0518791B1 publication Critical patent/EP0518791B1/de
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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2409—Electromagnetic mechanisms combined with an electromagnetic current limiting 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures

Definitions

  • the invention relates to an electromagnetic trip device, in particular for a miniature electric circuit breaker, comprising an excitation coil coaxially surrounding an insulating sheath of tubular shape, inside of which is slidably mounted a movable ferromagnetic core cooperating with a ferromagnetic core fixed with interposition of an axial air gap, an actuating rod made of insulating material, passing coaxially through a passage orifice formed in the fixed core, and having a first internal end secured to the movable core on the side of the air gap, an external end piece percussion device secured to the second opposite projecting end of the actuating rod, and return means urging the movable core towards a separated position.
  • Such a trigger is described in document EP-A-0378.030.
  • the mechanism trips, and the contacts open by percussion of the actuating rod of the movable core.
  • the kinetic energy accumulated by the mobile core during the magnetic attraction is thus transmitted to the mobile equipment of the circuit breaker to cause the forced opening of the contacts.
  • the transmission of the percussion energy can nevertheless generate transient mechanical behaviors liable to reduce the efficiency of the trigger, in particular when the actuating rod is snapped onto an attachment point shaped as a protruding boss of the movable core.
  • Such an articulated connection constitutes a ball joint.
  • the axial range of the rod passage orifice is also quite long, for example half the length of the fixed core.
  • the arrangement of such a known trigger can create proper modes of vibration, the first node of which is located approximately at the junction point of the articulation link.
  • the deformation of the rod can interfere with the fixed core, causing mechanical friction and a drop in percussion efficiency.
  • the object of the invention is to improve the efficiency of an electromagnetic trip device with striker for miniature circuit breaker.
  • the trip device according to the invention is characterized in that the first end of the insulating actuating rod is rigidly anchored in a blind hole conjugated with the movable core to form a built-in mechanical connection, said hole being arranged symmetrically with respect to the longitudinal axis, and that the first end of the rod has a non-cylindrical section.
  • the section of the first end of the insulating rod can be frustoconical.
  • the performance of the trigger can be further improved thanks to the annular rim formed in the bore of the fixed core, said rim being shaped as a diaphragm to improve the dynamic behavior of the moving element during the percussion phase following the magnetic attraction of the core movable against the pole surface of the fixed core.
  • the rim has a reduced central span, in particular less than a third of the length of the fixed core.
  • the rim is positioned in the vicinity of the middle of the actuating rod at the time of percussion.
  • an electromagnetic trip device 10 in particular for a control mechanism of a miniature circuit breaker, comprises a magnetic circuit 11 associated with an excitation coil 12 of cylindrical shape mounted coaxially on a tubular insulating sheath 13.
  • the magnetic circuit 11 made of ferromagnetic material comprises a carcass delimited by two lateral flanges 14,15 framing the sheath 13 in the direction of the longitudinal axis 16. Inside the sheath 13 and the carcass is slidably mounted a movable core or plunger 17 with the formation of a radial clearance 18 relative to the sleeve 13 and to the flange 14, allowing the displacement in axial translation of the core 17 along the longitudinal axis 16.
  • the sleeve 13 serves both as a support means of the coil 12, and of means for axially guiding the plunger core 17.
  • the plunger core 17 cooperates with a fixed core 19 arranged without play inside the sheath 13, and rigidly secured to the flange 15.
  • the plunger core 17 is equipped with a cylindrical actuating rod 20 of insulating material, extending along the longitudinal axis 16 and passing coaxially through an orifice 21 tubular passage formed in the fixed core 19.
  • the projecting end 22 of the rod 20 carries a percussion end piece 23 intended to cooperate firstly with a release lever to ensure the unlocking of the lock, and secondly with the support lever of the arm.
  • movable contact when the current flowing in the coil 12 exceeds the magnetic tripping threshold, causing the attraction of the plunger core 17 against the fixed core 19 (dotted in the figure). The operation of such a trigger is described in detail in document FR-A-2,641,644.
  • the plunger core 17 is provided with an annular notch 24 for housing a return spring 25, urging the plunger core 17 towards the separated position (in solid lines in the figure).
  • the magnetic triggering threshold of the trigger 10 depends on the preload of the return spring 25 which determines the return force antagonistic to the magnetic attraction force of the movable core 17.
  • the first internal end 26 of the insulating actuating rod 20 is rigidly anchored in a hole 27 conjugated with the ferromagnetic plunger core 17 to form a built-in mechanical connection.
  • the blind hole 27 is located on the side of the fixed core 19, and is arranged symmetrically with respect to the longitudinal axis 16.
  • the internal end 26 of the rod 20 is frustoconical, but may have any other non-cylindrical shape favoring embedding in hole 27.
  • the built-in mechanical connection can be reinforced by adding adhesive inside the hole 27, before the end 26 is introduced.
  • the depth of the hole 27 in the direction of the longitudinal axis 16 extends over a fraction of the axial length of the core plunger 17, in particular greater than 10%.
  • the plunger core 17 and embedded rod 20 assembly forms a rigid monobloc piece made of two different metal - plastic materials. This part constitutes the mobile assembly of the electromagnetic trip device 10.
  • the tubular orifice 21 for the passage of the rod 20 is delimited by an annular rim 28 of the hollow fixed core 19.
  • the diameter of the orifice 21 corresponds to the internal diameter of the rim 28, which is smaller than that of the bore 29 of the fixed core 19.
  • the guide rim 28 in which the actuating rod 20 slides, is arranged in the part intermediate of the bore 29, and has a bearing surface with a reduced axial length, in particular less than a third of that of the fixed core 19.
  • the rim 28 is shaped as a diaphragm located in the vicinity of the neutral of the main mode of vibration so as to reduce the mechanical friction of the actuating rod 20, and to improve the dynamic behavior of the moving assembly after the effect of the unfavorable modes on percussion.
  • the operation of the electromagnetic trip device 10 according to the invention is as follows:
  • the actuating rod 20 and the percussion endpiece 23 move with the movable core 17 from the inactive position (in solid lines) to the active position (in dotted lines), causing the mechanism to trigger, and an effect of percussion causing the forced opening of the moving contact of the circuit breaker.
  • the shock generated by the magnetic attraction of the movable core 17 is transmitted to the rod actuator 20 made of plastic material.
  • the rigid embedding of the end 26 of the rod 20 in the conjugate hole 27 of the movable core 17 prevents any buckling of the rod 20 and modifies the distribution of the natural modes of vibration following the axial shift from the middle of the rod 20 towards the built-in connection. Percussion occurs when a portion of the rod 20, in particular less than half the axial length, is released from the fixed core 19. The percussion is then in good performance conditions for the transmission of energy from the core mobile 17 to the mobile contact.
  • the second criterion for improving the efficiency of the energy transmission results from the presence of the diaphragm-shaped rim 28 having a reduced axial range.
  • the provision of a diaphragm in place of a longer reach in the fixed core 19 allows a significant reduction in friction of the actuating rod 20, and the elimination of unfavorable modes of vibration on percussion.
  • the fixed core 19 then plays the role of node selector.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Electric Clocks (AREA)

Claims (7)

  1. Elektromagnetischer Auslöser, insbesondere für einen Kleinleistungsschalter, mit einer Erregerspule (12), die koaxial um einen rohrförmigen Isolierstoff-Spulenträger (13) geführt ist, in dessem Inneren ein beweglicher ferromagnetischer Kern (17) gleitend gelagert ist, welcher über einen zwischengefügten Luftspalt (31) mit einem feststehenden ferromagnetischen Kern (19) zusammenwirkt, einer Isolierstoff-Betätigungsstange (20), die eine im feststehenden Kern (19) ausgebildete Durchführungsöffnung (21) koaxial durchragt und ein mit dem beweglichen Kern (17) auf der dem Luftspalt (31) zugewandten Seite fest verbundenes erstes, innenliegendes Ende (26), eine am gegenüberliegenden zweiten, herausstehenden Ende (22) der Betätigungsstange (20) befestigte äußere Schlagplatte (23) sowie Rückstellmittel (25) umfaßt, die den beweglichen Kern (17) in Richtung einer zurückgezogenen Stellung beaufschlagen, dadurch gekennzeichnet, daß das erste Ende (26) der Isolierstoff-Betätigungsstange (20) biegesteif in einer zugehörigen Blindbohrung (27) des beweglichen Kerns (17) verankert ist, um eine mechanische Einfassungsverbindung zu bilden, wobei die genannte Bohrung (27) symmetrisch zur Längsachse (16) ausgebildet ist und das erste Ende (26) der Betätigungsstange (20) einen nicht-zylindrischen Querschnitt aufweist.
  2. Elektromagnetischer Auslöser nach Anspruch 1, dadurch gekennzeichnet, daß das erste Ende (26) einen konischen Querschnitt aufweist
  3. Elektromagnetischer Auslöser nach Anspruch 2, dadurch gekennzeichnet, daß die mechanische Einfassungsverbindung dadurch verstärkt ist, daß vor dem Einsetzen des Endes (26) der Betätigungsstange (20) zusätzlich ein Klebstoff im Innern der Bohrung (27) aufgebracht wird.
  4. Elektromagnetischer Auslöser nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sich die Tiefe der Bohrung (27) in Richtung der Längsachse (16) gesehen über einen Teilabschnitt der axialen Länge des beweglichen Kerns (17) erstreckt, der insbesondere mehr als 10% dieser Länge beträgt.
  5. Elektromagnetischer Auslöser nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Durchführungsöffnung (21) für die Betätigungsstange (20) durch einen in der Ausnehmung (29) des feststehenden Kerns (19) ausgebildeten ringförmigen Vorsprung (28) begrenzt ist, wobei der genannte Vorsprung (19) als Blende ausgeführt ist, um das dynamische Verhalten des beweglichen Systems während der durch die magnetische Anziehung des beweglichen Kerns (17) gegen die Polfläche (30) des feststehenden Kerns (19) eingeleiteten Schlagphase zu verbessern.
  6. Elektromagnetischer Auslöser nach Anspruch 5, dadurch gekennzeichnet, daß der Vorsprung (28) eine verkürzte mittige Führungsfläche aufweist, deren Länge insbesondere weniger als ein Drittel der Länge des feststehenden Kerns (19) beträgt.
  7. Elektromagnetischer Auslöser nach Anspruch 6, dadurch gekennzeichnet, daß der Vorsprung (28) im Augenblick des Schlags etwa in der Mitte der Betätigungsstange (20) liegt.
EP19920420196 1991-06-14 1992-06-10 Elektromagnetischer Auslöser mit Schlagbolzen Expired - Lifetime EP0518791B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9107405 1991-06-14
FR9107405A FR2677807B1 (fr) 1991-06-14 1991-06-14 Declencheur electromagnetique a percuteur.

Publications (2)

Publication Number Publication Date
EP0518791A1 EP0518791A1 (de) 1992-12-16
EP0518791B1 true EP0518791B1 (de) 1996-03-20

Family

ID=9413935

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920420196 Expired - Lifetime EP0518791B1 (de) 1991-06-14 1992-06-10 Elektromagnetischer Auslöser mit Schlagbolzen

Country Status (4)

Country Link
EP (1) EP0518791B1 (de)
DE (1) DE69209155T2 (de)
ES (1) ES2086702T3 (de)
FR (1) FR2677807B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3721266B2 (ja) * 1998-08-04 2005-11-30 株式会社日立産機システム 回路遮断器
CN104681369B (zh) * 2015-02-10 2017-03-15 浙江正泰电器股份有限公司 电子式漏电保护开关脱扣装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7111834U (de) * 1971-03-29 1971-06-16 Bbc Ag
US3704435A (en) * 1971-12-20 1972-11-28 Ite Imperial Corp Tripping system for circuit breaker
DE3824546A1 (de) * 1988-07-20 1990-01-25 Asea Brown Boveri Elektrischer leistungsschalter
FR2641644B1 (fr) * 1989-01-11 1996-05-10 Merlin Gerin Dispositif de reglage inviolable d'un appareil electrique

Also Published As

Publication number Publication date
DE69209155D1 (de) 1996-04-25
FR2677807B1 (fr) 1993-09-03
ES2086702T3 (es) 1996-07-01
DE69209155T2 (de) 1996-10-02
EP0518791A1 (de) 1992-12-16
FR2677807A1 (fr) 1992-12-18

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