EP0538155A1 - Herstellungsverfahren für einen Magnetauslöser mit eingegossenem Schlagbolzen und danach hergestellter Auslöser - Google Patents

Herstellungsverfahren für einen Magnetauslöser mit eingegossenem Schlagbolzen und danach hergestellter Auslöser Download PDF

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Publication number
EP0538155A1
EP0538155A1 EP92420357A EP92420357A EP0538155A1 EP 0538155 A1 EP0538155 A1 EP 0538155A1 EP 92420357 A EP92420357 A EP 92420357A EP 92420357 A EP92420357 A EP 92420357A EP 0538155 A1 EP0538155 A1 EP 0538155A1
Authority
EP
European Patent Office
Prior art keywords
fixed core
core
trigger rod
fixed
trip device
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.)
Granted
Application number
EP92420357A
Other languages
English (en)
French (fr)
Other versions
EP0538155B1 (de
Inventor
Gérard Mazuit
Jean-Marc Finet
François Reynaud
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
Merlin Gerin SA
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 Merlin Gerin SA, Schneider Electric SE filed Critical Merlin Gerin SA
Publication of EP0538155A1 publication Critical patent/EP0538155A1/de
Application granted granted Critical
Publication of EP0538155B1 publication Critical patent/EP0538155B1/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
    • H01H71/2463—Electromagnetic mechanisms with plunger type armatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices

Definitions

  • the present invention relates generally to a method of manufacturing an electromagnetic trip device for a circuit breaker.
  • the invention also relates to such an electromagnetic trip device for circuit breaker.
  • Circuit breakers are generally constituted by a switch comprising a movable contact and a fixed contact and by a trigger which actuates the switch to open it when the intensity of electric current flowing through the circuit breaker exceeds a predetermined threshold.
  • the circuit breaker generally includes a thermal trip device and an electromagnetic trip device.
  • Such an electromagnetic trip device constitutes a relatively bulky, expensive and delicate part, in particular when it is used in a miniature circuit breaker intended to be produced in very large series at low costs.
  • the electromagnetic trip device is difficult to make because it has moving mechanical parts which can cause reliability problems, wear, adjustment drift, etc.
  • a widely used electromagnetic trip device comprises a cylinder head on which a fixed core is mounted.
  • a sheath is mounted around the fixed core which is generally of cylindrical shape and this sheath forms in the extension of the fixed core a cylindrical cavity in which is housed so as to be able to slide axially a movable core.
  • a coil surrounds the sheath, and the electric current flowing through the circuit breaker passes through this coil.
  • the movable core is permanently pushed by a spring in the direction of separation from the fixed core so that an air gap is created between a perpendicular flat face of the mobile core and a perpendicular flat face opposite the fixed core, this air gap being located substantially in the central central part of the sheath.
  • a trigger rod is fixed by one of its ends to the movable core and passes right through the fixed core through a bore formed axially in the fixed core, so that its other end projects to the outside the electromagnetic release.
  • An object of the present invention is to provide a method for manufacturing an electromagnetic trip device, this process being particularly simple to implement, so that the electromagnetic trip device is particularly inexpensive while remaining very reliable.
  • Another object of the present invention is to provide such an electromagnetic trip device whose original design makes it very inexpensive and very reliable.
  • the invention therefore relates to a method of manufacturing an electromagnetic trip device, this trip device comprising a fixed core adapted to be mounted on a cylinder head, a movable core which can move between a position remote from the fixed core and a position close to the fixed core, and a trigger rod connected to the movable core and extending through a through hole of the fixed core.
  • this method comprises the following stages: production of a mold comprising an imprint of an assembly formed by the fixed core, the movable core and the trigger rod, the relative positions of these three parts being substantially those they occupy when the three parts are mounted in the trigger and the movable core is distant from the fixed core; placing the fixed core and the movable core in the mold and injecting a molding material to produce the trigger rod by overmolding on the fixed and movable cores, then demolding of the assembly thus formed; and takeoff between the fixed core and the trigger rod which is overmolded on the fixed core.
  • said take-off operation consists of the application of a force causing a longitudinal relative displacement between the fixed core and the trigger rod.
  • the method further comprises a step of mounting the fixed core against the cylinder head, this step being obtained by gripping the assembly formed by the fixed core, the movable core and the trigger rod overmolded, this entry being made at the level of the movable core or of the trigger rod, then by bringing this together against the cylinder head so as to cause a shock meeting between the fixed core and the cylinder head, this shock causing both the mounting of the fixed core on the cylinder head and the takeoff between the fixed core and the trigger rod.
  • the invention also relates to an electromagnetic trip device comprising: a fixed core adapted to be mounted on a cylinder head, a movable core which can move between a position remote from the fixed core and a position close to the fixed core, and a trigger rod connected to the core mobile and passing through the fixed core.
  • the trigger rod is made of plastic, extends both through a bore of the fixed core and through a through hole of the movable core and is overmolded to the inside the fixed and mobile cores; where it follows that a force causing a relative longitudinal displacement between the fixed core and the trigger rod makes it possible to cause a takeoff between the fixed core and the trigger rod.
  • FIG. 1 shows an electromagnetic trip device of the prior art.
  • This trigger is shown schematically and simplified because such a device is well known and because it is therefore not necessary to describe it in its smallest construction details.
  • a known electromagnetic trip device comprises a sheath 1 which has the general shape of a cylindrical tube, a fixed core 2 which is fitted into the bore of the sheath 1 at one of its ends and a movable core 3 which is threaded in the same bore of the sleeve 1 and which is axially movable inside this bore.
  • the trip device further comprises a winding 4 arranged around the sheath 1 and through which an electric current flows which must actuate the trip device when its intensity exceeds a predetermined threshold.
  • the trigger further comprises a fixed cylinder head 5 on which the fixed core 2 is fixed.
  • the fixed core 2 has a generally cylindrical shape and has an axial bore 6 which passes right through it.
  • the movable core 3 has a generally cylindrical shape and comprises at its end directed towards the fixed core 2 a fixing element 7 on which is fixedly mounted a trigger rod 8 which passes through the bore 6 of the fixed core 2 for stand out on the outside at its end 9 furthest from the movable core 3. It follows from this that the assembly formed by the movable core 3, the fixing element 7 and the trigger rod 8 forms a single movable part which can move axially between two extreme positions.
  • the fixed core 2 and the movable core 3 respectively have perpendicular plane faces 10, 11 facing each other.
  • the movable core 3 further comprises a mooring element 12 on which is mounted a spring 13 which permanently exerts a thrust on the movable core 3 in the direction of its separation from the fixed core 2.
  • a predetermined threshold When an electric current flowing in the winding 4 is less than a predetermined threshold, the movable core 3 remains separated from the fixed core 2, due to the action of the spring 13, and the space separating the faces 10 and 11 forms an air gap.
  • the movable core 3 abruptly approaches the fixed core 2 until it comes into contact with it, which causes the displacement of the rod 8 whose end 9 comes out more of the trip device to come trigger the opening of an electrical contact of the circuit breaker (not shown).
  • the end 9 of the trigger rod 8 has a diameter greater than the diameter of the bore 6 in order to limit the spacing of the movable core 3 relative to the fixed core 2. Consequently, it is necessary in this case to start by threading the trigger rod 8 through the bore 6 of the fixed core 2 before proceeding to rigidly fix this trigger rod 8 with the movable core 3.
  • This mounting operation has proved to be delicate and expensive .
  • such an electromagnetic trip device undergoes sudden forces or shocks at its movable elements constituted by the movable core 3, the fixing element 7 and the trigger rod 8, and these mechanical shocks can rapidly deteriorate the mechanical connection between the trigger rod 8 and the movable core 3.
  • FIG. 2 represents an electromagnetic trip device of a general design similar to that illustrated by FIG. 1 but in which the movable core, the fixed core and the trigger rod have differences in their design and in their manufacturing process which constitute the originality of the present invention.
  • a sheath 1 can be distinguished around which is wound a winding 4 and a cylinder head 5, all these parts possibly being identical to those described in relation to the electromagnetic trip device of the prior art represented in FIG. 1.
  • this trigger according to the invention comprises a fixed core 20 which has a bore 21 which passes right through it, a trigger rod 22 which passes through the bore 21 and which passes through a through hole 23 of a movable core 24 and which emerges from the other side of the movable core 24 so that its free end 25 constitutes a securing element of a spring 13
  • the rod 22 forms a single piece, preferably made of plastic, from its end 25 which serves as mooring for the spring 13 to its other opposite end 26 which makes it possible to trigger an electrical contact of a circuit breaker (not shown ).
  • the assembly of the trigger rod that is to say the trigger rod itself 22, and its two opposite ends 25 and 26, constitutes a single piece of plastic.
  • This part is in fact molded inside the passage hole 23 which passes right through the movable core 24.
  • the fact of overmolding the trigger rod 22 in the passage hole 23 of the movable core 24 ensures a definitive rigid connection the trigger rod 22 and the movable core 24.
  • This connection has excellent mechanical characteristics.
  • the bore 21 of the fixed core 20 has a diameter slightly larger than that of the trigger rod 22 at the same level, in order to allow the sliding of these two parts one over the other.
  • the hole 23 which passes through the movable core 24 may have a flared part at the two opposite ends of the hole, so that the trigger rod 22 which follows the shape of the hole 23 remains integral with the movable core 24 even if it doesn’t there is no real adhesion between the material of the rod 22 and that of the movable core 24.
  • the rod 22 has a diameter which varies without discontinuity all along the rod, which makes it possible to increase the resistance to fatigue of this rod 22 and to reduce its fragility. This is all the more important since the trigger rod 22 is preferably made of plastic material.
  • the presence of this plastic rod 22 passing right through both the fixed core 20 and the movable core 24 limits the mass of these two cores which are metallic, which reduces the mass of the together and this significantly improves the tripping speed of the circuit breaker.
  • FIG. 3 illustrates a first step in the method of producing such an assembly.
  • This first step consists in producing a particular mold (not shown) which includes an imprint of the assembly formed by the fixed core 20, the movable core 24 and the trigger rod 22.
  • the relative positions of these three parts are those they occupy when the three parts 20, 23, 22 are mounted in the trigger while the movable core 24 is distant from the fixed core 20 (positions as shown in Figure 3).
  • the fixed core 20 and the movable core 24 are placed in such a mold, then a plastic molding material is injected which occupies the rest of the mold footprint by being overmolded against the fixed and mobile cores 20, 24, this overmolding taking place simultaneously at the bore 21 of the fixed core 20 and at the passage hole 23 of the mobile core 24.
  • the plastic material thus injected into the mold constitutes the rod trigger 22 of the electromagnetic trigger. It follows from this that the trigger rod 22 adheres both to the fixed core 20 and to the movable core 24, after demolding of the assembly.
  • the adhesion of the trigger rod 22 with the movable core 24 is useful because it contributes to ensuring the final rigid connection of these two parts.
  • a mold is produced, for example a mold in two parts having a joint plane passing through the longitudinal axis of the trigger rod 22, this mold matching the external shapes of all the parts such as shown in Figure 3.
  • the cores are made of metal, in order to fulfill their magnetic function, it is easy to mold the trigger rod 22, for example using a plastic material, by choosing a melting temperature of this plastic material which does not alter the movable core 24 and the fixed core 20.
  • FIG. 4 A next step in the manufacturing process is illustrated in FIG. 4. During this next step, takeoff is carried out between the fixed core 20 and the trigger rod 22. To take off, it suffices to exert an axial thrust on the fixed core 20 in the direction of the movable core 24 (arrow F).
  • the bore 21 of the fixed core 20 may be cylindrical, but, in certain cases, it is preferable that this bore 21 (as shown in FIG. 4) is slightly conical so that its diameter is larger in its part the most distant from the movable core 24. Under these conditions, the fact of moving the fixed core 20 in the direction of the movable core 24 causes the detachment of the fixed core 20 relative to the trigger rod 22, and reveals a slight play J between the movable core 20 and the trigger rod 22.
  • the taper of the bore 21 is relatively small so that the clearance J remains weak.
  • This operation mounting can be performed in particular automatically by bringing the assembly formed by the trigger rod 22, the fixed core 20 and the movable core 24 opposite the cylinder head 5, then by moving axially This assembly in the direction of the cylinder head 5 (along arrow H) by exerting a push on the trigger rod 22, until the bearing face 30 of the fixed core 20 abuts against the cylinder head 5.
  • the reaction force of the cylinder head 5 against the face 30 of the fixed core 20 makes it possible to detach the fixed core 20 relative to the trigger rod 22.
  • this reaction force is used in a manner similar to the force which is illustrated by the arrows F in FIG. 4 in order to cause the separation of the fixed core with respect to the trigger rod during the assembly operation.
  • Such a manufacturing method according to the invention makes it possible to obtain a reinforcement of the mechanical strength of the striker and of the movable core. This process also makes it possible to obtain a lightening of the mobile core and consequently an increase in the percussion speed.
  • a plastic material as a molding material
  • a non-magnetic metallic molding material in particular based on zinc, for example the product known commercially under the name ZAMAK.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnets (AREA)
  • Breakers (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
EP19920420357 1991-10-14 1992-10-09 Herstellungsverfahren für einen Magnetauslöser mit eingegossenem Schlagbolzen und danach hergestellter Auslöser Expired - Lifetime EP0538155B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112726 1991-10-14
FR9112726A FR2682532B1 (fr) 1991-10-14 1991-10-14 Procede de fabrication d'un declencheur electromagnetique a percuteur surmoule et declencheur ainsi obtenu.

Publications (2)

Publication Number Publication Date
EP0538155A1 true EP0538155A1 (de) 1993-04-21
EP0538155B1 EP0538155B1 (de) 1997-02-12

Family

ID=9417956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920420357 Expired - Lifetime EP0538155B1 (de) 1991-10-14 1992-10-09 Herstellungsverfahren für einen Magnetauslöser mit eingegossenem Schlagbolzen und danach hergestellter Auslöser

Country Status (5)

Country Link
EP (1) EP0538155B1 (de)
CN (1) CN1026739C (de)
DE (1) DE69217442T2 (de)
ES (1) ES2099236T3 (de)
FR (1) FR2682532B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753836A1 (fr) * 1996-09-23 1998-03-27 Schneider Electric Sa Declencheur electromagnetique pour appareil electrique de protection

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005044540A1 (de) * 2005-09-17 2007-03-22 Abb Patent Gmbh Elektrisches Installationsschaltgerät
DE102007043869B4 (de) * 2007-09-14 2016-02-25 Siemens Aktiengesellschaft Spulenträger und Joch eines elektromagnetischen Auslösers eines Schutzschaltgerätes, elektromagnetischer Auslöser sowie Schutzschaltgerät

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7017627U (de) * 1970-05-12 1971-11-04 Siemens Ag Magnetischer schnellausloeser.
GB2000379A (en) * 1977-06-27 1979-01-04 Weber Ag Fab Elektro Magnetic trip mechanism for automatic cut-out
EP0041049A2 (de) * 1980-05-28 1981-12-02 Weber AG Fabrik elektrotechnischer Artikel und Apparate Leitungsschutzschalter
DE8527361U1 (de) * 1985-09-25 1986-01-09 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Kurzschlußauslöseorgan
EP0369899A1 (de) * 1988-11-16 1990-05-23 Merlin Gerin Magnetischer Auslöser mit breitem Bereich zur Regelung des Auslöseansprechwertes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7017627U (de) * 1970-05-12 1971-11-04 Siemens Ag Magnetischer schnellausloeser.
GB2000379A (en) * 1977-06-27 1979-01-04 Weber Ag Fab Elektro Magnetic trip mechanism for automatic cut-out
EP0041049A2 (de) * 1980-05-28 1981-12-02 Weber AG Fabrik elektrotechnischer Artikel und Apparate Leitungsschutzschalter
DE8527361U1 (de) * 1985-09-25 1986-01-09 Lindner Gmbh, Fabrik Elektrischer Lampen Und Apparate, 8600 Bamberg Kurzschlußauslöseorgan
EP0369899A1 (de) * 1988-11-16 1990-05-23 Merlin Gerin Magnetischer Auslöser mit breitem Bereich zur Regelung des Auslöseansprechwertes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2753836A1 (fr) * 1996-09-23 1998-03-27 Schneider Electric Sa Declencheur electromagnetique pour appareil electrique de protection
EP0834895A1 (de) * 1996-09-23 1998-04-08 Schneider Electric Sa Elektromagnetischer Auslöser für elektrisches Schutzgerät
US5894257A (en) * 1996-09-23 1999-04-13 Schneider Electric Sa Electromagnetic trip for an electrical apparatus for protection

Also Published As

Publication number Publication date
FR2682532A1 (fr) 1993-04-16
EP0538155B1 (de) 1997-02-12
DE69217442D1 (de) 1997-03-27
CN1026739C (zh) 1994-11-23
FR2682532B1 (fr) 1993-11-26
DE69217442T2 (de) 1997-07-10
ES2099236T3 (es) 1997-05-16
CN1071531A (zh) 1993-04-28

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