WO1991014277A1 - Dispositif de commutation a commande electromagnetique - Google Patents

Dispositif de commutation a commande electromagnetique Download PDF

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Publication number
WO1991014277A1
WO1991014277A1 PCT/SE1990/000164 SE9000164W WO9114277A1 WO 1991014277 A1 WO1991014277 A1 WO 1991014277A1 SE 9000164 W SE9000164 W SE 9000164W WO 9114277 A1 WO9114277 A1 WO 9114277A1
Authority
WO
WIPO (PCT)
Prior art keywords
switching device
electric switching
contact
contact carrier
armature
Prior art date
Application number
PCT/SE1990/000164
Other languages
English (en)
Inventor
Lennart Johansson
Original Assignee
Asea Brown Boveri Ab
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 Asea Brown Boveri Ab filed Critical Asea Brown Boveri Ab
Priority to PCT/SE1990/000164 priority Critical patent/WO1991014277A1/fr
Publication of WO1991014277A1 publication Critical patent/WO1991014277A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature
    • H01H50/32—Latching movable parts mechanically

Definitions

  • the present invention relates to an electric switching device, preferably a contactor, of the kind mentioned in the preamble to claim 1.
  • the electric switching device comprises at least one fixed contact mounted on a stand and one movable contact cooperating with the fixed contact, the movable contact being influenced by a contact pressure spring and being displaceable between a closed and an open position with the aid of a contact carrier connected to an armature on an operating magnet.
  • the purpose of the present device is to provide an electric switching device of the kind described in the preamble to claim 1, which is provided with a simple and little space- demanding latching device which permits the holding force of the operating magnet to be reduced to a minimum and which permits the use of a higher contact pressure (stronger contact pressure springs) .
  • the latching device is to be designed such that its locking function ceases so that the electric switching device is opened as soon as the current to the operating magnet is broken. This is achieved according to the invention with an electric switching device with the characteristic features stated in the characterizing part of claim 1.
  • the contact carrier may, without the holding force therefore having to be increased, be loaded with additional forces, for example forces which are developed by a contact pressure-amplifying magnetic circuit, excited by the current through the contactors, of the kind described in Swedish patent application 8800398-3.
  • additional forces for example forces which are developed by a contact pressure-amplifying magnetic circuit, excited by the current through the contactors, of the kind described in Swedish patent application 8800398-3.
  • Figure 1 shows a longitudinal section of a contactor designed according to the invention in open position
  • Figures 2-7 show different stages during the closing and opening operations of the contactor.
  • the contactor shown in Figure 1 is of three-pole design and has a rated insulation voltage of, for example, 750 V.
  • the rated operating current may, for example, be in the range 40-1000 A.
  • the contactor is built up on a stand 11 of glass-fibre-reinforced polyester with a bottom plate 12 of metal.
  • the contact assembly of the contactor comprises in each pole two electrically series-connected breaks. Each break has a fixed contact 13 which is attached to a connection bar 1 .
  • the fixed contacts are, in closed contact position, connected to each other through a movable contact 15.
  • the contact assembly is surrounded by an arc chute 16 of plastic which is provided with deionization plates 17.
  • the movable contact 15 is attached together with a contact pressure spring 18 into an opening of a contact carrier 19 made of plastic, which with the aid of a leaf spring 20 is connected to the armature 21 of the operating magnet of the contactor, the magnetic core and coil of which are designated 22 and 23, respectively. Between the magnetic core 22 and the bottom plate 12 there is a damping washer 24. Between the contact carrier 19 and the bottom plate 12, opening springs (not shown) are prestressed. When the coil 23 is currentless, these springs press the contact carrier 19 and thus the armature 21 to the open position shown in Figure 1.
  • the latching device 30 Adjacent to the contacts in the central contactor pole, a latching device 30 is mounted.
  • the latching device comprises the following parts:
  • a sleeve 31 of tempered steel which is fixedly mounted in relation to the stand 11.
  • the sleeve has a cylindrical hole.
  • a pin 32 of tempered steel which is fixedly mounted in relation to the contact carrier 19.
  • the pin has a conical portion.
  • the cone has its largest diameter in a direction towards the armature 21.
  • the pin 32 is, in the embodiment shown, fixed to the contact carrier 19 by means of a resilient tubular pin 33. Freedom from play in the connection between the parts 32 and 19 is achieved by a relatively weak compression spring 34.
  • a number of ball bearing balls 35 which with the aid of a spring 36 are prestressed in a direction towards the armature 21.
  • the task of the balls is to lock the axial position of the pin 32 in relation to the sleeve 31 in a direction towards the movable contact, when the magnet is closed.
  • a tube 37 which is mounted such that it is influenced by the movements of the armature 21 in relation to the contact carrier 19.
  • the task of the tube 37 is to disengage the balls 35 when the magnet is open.
  • the tube 37 is loosely laid into the cylindrical gap between the pin 32 and the sleeve 31.
  • the tube need not necessarily be fixedly mounted to the armature 21.
  • Figures 1-7 show the course of events upon switching on and switching off the control voltage to the magnet of the contactor.
  • the dimensional figures are fictitious and are only given to show more clearly the relationship between the movements of the various parts.
  • Figure 1 shows the contactor in its open position (rest position) .
  • the control voltage is switched off.
  • the contact distance is 6 mm and the distance between the armature 21 of the magnet and the core 22 is 10 mm.
  • Figure 2 shows what happens during a first stage of the closing operation.
  • the armature 21, the contact carrier 19 and the movable contacts 15 move downwards towards the magnetic core 22 until the movable contacts hit the fixed contacts 13.
  • the movement of the armature 21 is greater than that of the other parts, since with the aid of the leaf spring 20 it is loosely suspended in relation to the contact carrier 19.
  • the extra movement of the armature in the direction of the magnetic core results in termination of the disengaging of the balls 35 by the tube 37 and in the balls engaging between the sleeve 31 and the conical portion of the pin 32.
  • Figure 3 shows the contactor after a second stage of the closing operation.
  • the armature 21 and the contact carrier 19 have continued downwards until the armature has hit the magnetic core 22, and an additional small distance (0.5 mm) corresponding to the resilience of the bottom plate 12 and the damping washer 24.
  • the contact pressure is built up with the aid of the springs 18 which are arranged between the contact carrier and the movable contacts .
  • Figure 4 shows the contactor in its closed position, after the armature 21, the bottom plate 12 and the damping washer 24 have sprung back. Because of the locking in the latching device, the contact carrier 19 is now prevented from moving upwards, with the exception of the minimum movement (0.2 mm) caused by small elastic surface deformations on the sleeve 31, the pin 32 and the balls 35. In this position, the contact carrier is subjected to the compressive forces from both the contact pressure springs 18 and the opening springs (including the corresponding springs for a number of auxiliary contacts, not shown in the figure) . The holding force of the magnet can now be reduced to a level which need not be higher than that the magnet is able to resist the force from the leaf spring 20. In addition, the contact carrier has in this position been loaded with additional forces which act in a dirction away from the magnet without the holding force of the magnet therefore having to be increased.
  • Figure 5 shows what happens during the first stage of an opening operation. After the control voltage has been broken, the leaf spring 20 pulls up the armature 21 towards the contact carrier 19. The tube 37 is urged by the force from the leaf spring and by the kinetic energy of the armature and disengages the balls 35 from their locked position.
  • Figure 6 shows the contactor after the second stage of the opening operation, during which the armature 21 and the contact carrier 19 move upwards until the contact carrier hits the movable contacts 15.
  • Figure 7 finally shows the final stage of the opening operation, when the armature 21, the contact carrier 19 and the movable contacts 15 completely resume their original positions (the rest position) .

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Abstract

L'invention concerne un contacteur présentant au moins un contact mobile (15) déplaçable entre une position fermée et une position ouverte à l'aide d'un porte-contact (19) relié à un rotor (21) disposé sur un aimant de travail. Le contacteur comprend un dispositif de verrouillage (30) qui bloque le porte-contact par rapport au support (11) du contacteur lorsque l'aimant de travail est dans la position fermée. Le dispositif de verrouillage comprend des billes (35) qui, à l'aide d'un ressort (36), sont comprimées entre une surface cylindrique et une surface conique de deux éléments disposés coaxialement (31, 32), dont l'un (31) est monté de manière fixe par rapport au support (11) et l'autre (32) est monté de manière fixe par rapport au porte-contact (19). Le dispositif de verrouillage est conçu de manière que la fonction de verrouillage soit suspendue dès que la tension de commande alimentant l'aimant est interrompue.
PCT/SE1990/000164 1990-03-15 1990-03-15 Dispositif de commutation a commande electromagnetique WO1991014277A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE1990/000164 WO1991014277A1 (fr) 1990-03-15 1990-03-15 Dispositif de commutation a commande electromagnetique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE1990/000164 WO1991014277A1 (fr) 1990-03-15 1990-03-15 Dispositif de commutation a commande electromagnetique

Publications (1)

Publication Number Publication Date
WO1991014277A1 true WO1991014277A1 (fr) 1991-09-19

Family

ID=20378272

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1990/000164 WO1991014277A1 (fr) 1990-03-15 1990-03-15 Dispositif de commutation a commande electromagnetique

Country Status (1)

Country Link
WO (1) WO1991014277A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009105916A1 (fr) * 2008-02-29 2009-09-03 Siemens Aktiengesellschaft Dispositif de commutation, procédé d'assemblage ou de fonctionnement d'un tel dispositif de commutation, et dispositif électrique comprenant ledit dispositif de commutation
CN104867785A (zh) * 2015-05-11 2015-08-26 温州大学 带分断保护装置的永磁式接触器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR825324A (fr) * 1936-11-14 1938-03-01 Andre Citroe N Contact électrique à verrouillage automatique de sécurité
US3265941A (en) * 1963-09-24 1966-08-09 Hi G Inc Electromagnetic operator
CH501303A (de) * 1969-12-18 1970-12-31 Sprecher & Schuh Ag Elektrisches Schaltgerät mit einer Verklinkungsvorrichtung für das bewegliche Schaltstück
CH514227A (de) * 1971-03-10 1971-10-15 Sprecher & Schuh Ag Elektrisches Schaltgerät mit einer Verklinkungsvorrichtung für das bewegliche Schaltstück
US4437079A (en) * 1982-09-29 1984-03-13 Eaton Corporation Magnetic snap latch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR825324A (fr) * 1936-11-14 1938-03-01 Andre Citroe N Contact électrique à verrouillage automatique de sécurité
US3265941A (en) * 1963-09-24 1966-08-09 Hi G Inc Electromagnetic operator
CH501303A (de) * 1969-12-18 1970-12-31 Sprecher & Schuh Ag Elektrisches Schaltgerät mit einer Verklinkungsvorrichtung für das bewegliche Schaltstück
CH514227A (de) * 1971-03-10 1971-10-15 Sprecher & Schuh Ag Elektrisches Schaltgerät mit einer Verklinkungsvorrichtung für das bewegliche Schaltstück
US4437079A (en) * 1982-09-29 1984-03-13 Eaton Corporation Magnetic snap latch

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009105916A1 (fr) * 2008-02-29 2009-09-03 Siemens Aktiengesellschaft Dispositif de commutation, procédé d'assemblage ou de fonctionnement d'un tel dispositif de commutation, et dispositif électrique comprenant ledit dispositif de commutation
EP2260498A1 (fr) * 2008-02-29 2010-12-15 Siemens Aktiengesellschaft Dispositif de commutation, procédé d'assemblage ou de fonctionnement d'un tel dispositif de commutation, et dispositif électrique comprenant ledit dispositif de commutation
CN101939809A (zh) * 2008-02-29 2011-01-05 西门子公司 开关装置、组装或操作此开关装置的方法及包括此开关装置的电子装置
EP2260498A4 (fr) * 2008-02-29 2014-08-13 Siemens Ag Dispositif de commutation, procédé d'assemblage ou de fonctionnement d'un tel dispositif de commutation, et dispositif électrique comprenant ledit dispositif de commutation
CN104867785A (zh) * 2015-05-11 2015-08-26 温州大学 带分断保护装置的永磁式接触器

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