EP0117788B1 - Magneto-thermal device for overcurrent relay - Google Patents

Magneto-thermal device for overcurrent relay Download PDF

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Publication number
EP0117788B1
EP0117788B1 EP84400206A EP84400206A EP0117788B1 EP 0117788 B1 EP0117788 B1 EP 0117788B1 EP 84400206 A EP84400206 A EP 84400206A EP 84400206 A EP84400206 A EP 84400206A EP 0117788 B1 EP0117788 B1 EP 0117788B1
Authority
EP
European Patent Office
Prior art keywords
core
magneto
yoke
thermal device
piece
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
Application number
EP84400206A
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German (de)
French (fr)
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EP0117788A1 (en
Inventor
Dominique Moreau
Pierre Duchemin
Jean-Pierre Duchemin
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.)
Telemecanique SA
Original Assignee
Telemecanique Electrique SA
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Publication date
Application filed by Telemecanique Electrique SA filed Critical Telemecanique Electrique SA
Priority to AT84400206T priority Critical patent/ATE22505T1/en
Publication of EP0117788A1 publication Critical patent/EP0117788A1/en
Application granted granted Critical
Publication of EP0117788B1 publication Critical patent/EP0117788B1/en
Expired legal-status Critical Current

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    • 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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7463—Adjusting only the electromagnetic mechanism

Definitions

  • the invention relates to a magneto-thermal device, capable of producing the opening of a safety switch when the current flowing through it, either an excessive instantaneous intensity, or a less important intensity but of too long duration;
  • this device comprises a bimetallic strip, a magnetizable yoke with which are associated: on the one hand, an adjustable screwed core which is surrounded by a coil and, on the other hand, an angularly movable pallet around one end of the yoke to cooperate with one end of this core placed substantially at the same level and against a return spring, and blocking means associated with this core to ensure the adjustment position.
  • thermal relays Such devices are widely used in devices, commonly called thermal relays, which are intended to monitor the currents flowing in a load, in particular in an electric motor, to interrupt its supply when the current which it consumes takes abnormal values.
  • the adjustment of the respective position of the active end of the core and of the pallet is effected by the displacement of an opposite threaded end in a threaded opening of the cylinder head, while a blocking of the chosen adjustment is operated using a locking nut which is engaged on this threaded end.
  • Such a known device has the drawback of possible driving of the core at the moment when a locking torque is communicated to the nut; when the thread pitch is fine, such a drive remains weak; but, even in this case, it is not excluded that the locking forces cause a slight lateral displacement of the active end and modify the leakage air gap which exists between it and the end of the cylinder head.
  • the invention therefore proposes to provide a device conforming to that the constitution of which is mentioned above, but in which measures will be taken so that the core locking means do not modify the lateral position of the active end of the core and ensure the permanence of the adjustment made.
  • the desired result is obtained thanks to the fact that, in a plane perpendicular to the axis of the core and close to the end of the cylinder head serving as a pivot for the pallet, a non-magnetizable flat part is placed in compression radial between the end of the core and a face of the breech branch situated opposite, the radial dimension of this part being slightly greater than the distance which separates this end and this face in the absence of this part.
  • a magneto-thermal device 1, visible in FIG. 1, is for example placed inside a protection device 2, so that a current flowing through a load and between terminals 3 and 4 passes through a relay magnetic 5 and a bimetallic strip 6 placed in series.
  • a movable pallet 33 of this relay and a movable end 6a of this bimetallic strip transmit the displacements or deformations which they undergo (possibly via retarder means 7 or association means 8 common to several identical bimetallic strips) to a member or abrupt tripping mechanism 9, the release of which causes the opening of a safety switch 10.
  • the terminals of this switch which have not been shown, are themselves associated with a control circuit capable of establishing or interrupting in a known manner the supply of the load.
  • the relay 5 visible in FIG. 2, comprises a magnetizable yoke 11 having two perpendicular wings 12 and 13, the shortest of which 12 is, in the illustrated embodiment, welded to a support plate 14.
  • an insulating carcass 20 on which is wound, between two cheeks 21,22 of the carcass, a winding 23.
  • the lower cheek 21 adjacent to the branch 12 supports a conductive part 24 which is associated with the terminal 3 and is soldered to one end 25a of the coil wire.
  • the upper cheek 22 has, in a plane PP 'close to the end 19 and substantially perpendicular to the axis XX', see Figures 4 and 5, a groove 26, which is open towards the internal face 27 of the branch 13 and which opens up to the internal bore 28 of the carcass.
  • This groove which is open laterally at least towards one side 29 of the cheek 22, see FIG. 4, receives a non-magnetizable metallic flat piece 30 produced for example from aluminum, brass or stainless steel.
  • This part which can slide in the groove in the manner of a wedge 32, has a radial dimension "d" greater than the distance separating the face 27 of the cylindrical surface 31 of the core 17 placed opposite, this distance being measured when the part 30 is not mounted.
  • this part 30 is placed in compression when it is put in place, or that the core 17 is subjected to a stress perpendicular to the axis XX '; an elastic wedging effect of the core 17 is therefore effected in the region where the end 16 and the opening 15 cooperate.
  • the part 30 consequently comprises a bevelled region 34 which is first followed by a notch 35, then by a rectilinear wall 36; this wall and this bevelled region have widths "e" slightly greater than the distance "d"; the engagement of the part 30 is carried out in the direction of the arrow F by producing slight elastic deformations of the core and of the branch 13, until the snap-action of the notch 35 takes place on the surface 31 of the end 18 of the core 17.
  • the magnetizable pallet 33 which has been mentioned above pivots around an edge 37 placed at the end 19 of the branch 13, perpendicular to the axis XX 'and is subjected to a restoring force delivered by a spring 38.
  • the pallet is held and guided in the rest position, on the one hand by means of a tongue 39 which is placed in the axial extension of the branch 13 to pass through an opening 40 in this pallet and, on the other hand, by means of two ears 41, 42 which surround the latter laterally, see FIGS. 3 and 5.
  • the two ears 41, 42 are carried by a cut flat piece 43, which is fixed to the external face 44 of the branch 13, for example using solder points 45; a notch 46, which is located between the ears 41, 42 at the upper part, is placed lower than the edge 37 and at a level such that no material contact is established with the lower face 48 of this pallet.
  • this part 43 has been used to serve as an adjustable support for bimetallic strip 6, thanks to the welded shape which has been given to it.
  • the transverse portion 47 of the part 43 carrying the 5 ears 41, 42 and the welding points 45 is connected to an extension 49 substantially perpendicular by a constricted portion 50.
  • This constricted portion is adjacent to a first bent tab 51 which is connected at the end 25b of the winding passing through a notch 52 of the branch 13 of the cylinder head, while a second bent tab 53, equipped with a finger 54 for hooking the spring 38, is carried by the extension 49.
  • an edge 55 of the extension 49 which is inclined relative to the axis XX, is placed against the end 56 of a screw 57, of axis parallel to XX ', which is engaged in a threaded opening 58 of the plate 14.
  • This plate finally comprises fixing means, not shown, which allow it to be rigidly associated with a fixed wall 59 of the device.
  • the position of the upper end 6a of the bimetallic strip 6, which is parallel to the axis XX 'and whose lower end 6b is fixed on the tab 53, can be adjusted in the direction G by virtue of the lateral displacement effected by the edge 55 when the screw 57 is moved along its axis; this movement is made possible by the elastic deformation which the constricted portion 50 can undergo.
  • a first end of a heater 6c is connected to the end 6a of the bimetallic strip, while a second end 6d is connected by a conductor 60 to the terminal 4, see FIGS. 2 and 3.
  • the angular movement of the pallet 33 is communicated, in the direction L, by a pusher 61 coming from one piece with a plastic cap 62 which is fixed on this pallet.

Landscapes

  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Breakers (AREA)
  • Transformers For Measuring Instruments (AREA)
  • Electromagnets (AREA)
  • Electronic Switches (AREA)
  • Relay Circuits (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Protection Of Generators And Motors (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Manufacture Of Switches (AREA)

Abstract

The invention provides a magneto-thermal device for overcurrent relays. The end of a core, whose axial position may be adjusted with respect to a mobile plate, placed opposite and pivoting about one end of the yoke, is secured against movement by a wedge which is guided in a groove belonging to a flange of the coil shell. This device may be used in any thermal relay where a stable and precise adjustment of the tripping current threshold is desired.

Description

L'invention se rapporte à un dispositif magnéto-thermique, apte à produire l'ouverture d'un interrupteur de sécurité lorsque le courant qui le traverse présente, soit une intensité instantanée excessive, soit une intensité moins importante mais de trop grande durée; ce dispositif comprend un bilame, une culasse magnétisable à laquelle sont associés: d'une part, un noyau réglable vissé qui est entouré par une bobine et, d'autre part, une palette angulairement mobile autour d'une extrémité de la culasse pour coopérer avec une extrémité de ce noyau placée sensiblement au même niveau et à rencontre d'un ressort de rappel, et des moyens de blocage associés à ce noyau pour assurer la position de réglage.The invention relates to a magneto-thermal device, capable of producing the opening of a safety switch when the current flowing through it, either an excessive instantaneous intensity, or a less important intensity but of too long duration; this device comprises a bimetallic strip, a magnetizable yoke with which are associated: on the one hand, an adjustable screwed core which is surrounded by a coil and, on the other hand, an angularly movable pallet around one end of the yoke to cooperate with one end of this core placed substantially at the same level and against a return spring, and blocking means associated with this core to ensure the adjustment position.

De tels dispositifs sont largement utilisés dans des appareils, couramment appelés relais thermiques, qui sont destinés à surveiller les courants circulant dans une charge, notamment dans un moteur électrique, pour interrompre son alimentation lorsque le courant qu'il consomme prend des valeurs anormales.Such devices are widely used in devices, commonly called thermal relays, which are intended to monitor the currents flowing in a load, in particular in an electric motor, to interrupt its supply when the current which it consumes takes abnormal values.

Dans les dispositifs dont la constitution répond à celle mentionnée ci-dessus il est nécessaire de procéder à un réglage du noyau pour que l'intensité du courant qui circule dans la bobine provoque l'attraction de la palette lorsqu'un seuil de courant bien défini est atteint; ce seuil d'intensité, qui est déterminé en fonction des caractéristiques propres à chaque moteur, provoque un déclenchement en fonction des divers paramètres géométriques de la bobine, du circuit magnétique et du ressort de rappel, qui sont sujets à de légères variations au cours d'une fabrication en grande série; par ailleurs, un réglage effectué en usine pour que l'appareil fini présente les propriétés de protection souhaitées, doit être conservé au cours du montage et après celui-ci lorsqu'apparaissent, soit des contraintes mécaniques ou thermiques, soit un vieillissement des matériaux de l'appareil ou de son boîtier.In devices whose constitution responds to that mentioned above, it is necessary to adjust the core so that the intensity of the current flowing in the coil causes the attraction of the pallet when a well defined current threshold is reached; this intensity threshold, which is determined as a function of the characteristics specific to each motor, triggers as a function of the various geometric parameters of the coil, the magnetic circuit and the return spring, which are subject to slight variations during '' mass production; in addition, an adjustment carried out in factory so that the finished device presents the desired protective properties, must be preserved during the assembly and after this one when appear, either mechanical or thermal stresses, or an aging of the materials of the device or its casing.

Parmi les réglages dont l'importance est prépondérante figurent ceux qui influent sur la dimension des entrefers qui existent entre l'extrémité du noyau, la palette et l'extrémité de la culasse; la modification du premier de ces entrefers ne doit notamment pas influencer le second.Among the settings which are of paramount importance are those which influence the size of the air gaps which exist between the end of the core, the pallet and the end of the cylinder head; the modification of the first of these air gaps must not in particular influence the second.

Dans certains dispositifs connus, le réglage de la position respective de l'extrémité active du noyau et de la palette est opéré grâes au déplacement d'une extrémité opposée filetée dans une ouverture filetée de la culasse, tandis qu'un blocage du réglage choisi est opéré à l'aide d'un écrou de blocage qui est engagé sur cette extrémité filetée. Un tel dispositif connu présente l'inconvénient d'un entraînement possible du noyau au moment où un couple de blocage est communiqué à l'écrou; lorsque le pas du filetage est fin, un tel entraînement reste faible; mais, même dans ce cas, il n'est pas exclu que les efforts de blocage provoquent un léger déplacement latéral de l'extrémité active et modifient l'entrefer de fuite qui existe entre elle et l'extrémité de la culasse.In certain known devices, the adjustment of the respective position of the active end of the core and of the pallet is effected by the displacement of an opposite threaded end in a threaded opening of the cylinder head, while a blocking of the chosen adjustment is operated using a locking nut which is engaged on this threaded end. Such a known device has the drawback of possible driving of the core at the moment when a locking torque is communicated to the nut; when the thread pitch is fine, such a drive remains weak; but, even in this case, it is not excluded that the locking forces cause a slight lateral displacement of the active end and modify the leakage air gap which exists between it and the end of the cylinder head.

L'invention se propose par suite de fournir un dispositif conforme à celui dont la constitution est mentionnée ci-dessus, mais dans lequel des mesures seront prises pour que les moyens de blocage du noyau ne modifient pas la position latérale de l'extrémité active du noyau et assurent la permanence du réglage effectué.The invention therefore proposes to provide a device conforming to that the constitution of which is mentioned above, but in which measures will be taken so that the core locking means do not modify the lateral position of the active end of the core and ensure the permanence of the adjustment made.

Selon l'invention, le résultat visé est obtenu grâce au fait que, dans un plan perpendiculaire à l'axe du noyau et voisin de l'extrémité de le culasse servant de pivot à la palette, une pièce plate non magnétisable est placée en compression radiale entre l'extrémité du noyau et une face de la branche de culasse située en regard, la dimension radiale de cette pièce étant légèrement supérieure a la distance qui sépare cette extrémité et cette face en l'absence de cette pièce.According to the invention, the desired result is obtained thanks to the fact that, in a plane perpendicular to the axis of the core and close to the end of the cylinder head serving as a pivot for the pallet, a non-magnetizable flat part is placed in compression radial between the end of the core and a face of the breech branch situated opposite, the radial dimension of this part being slightly greater than the distance which separates this end and this face in the absence of this part.

L'invention, ainsi que des mesures complémentaires propres à faciliter l'ensemble des réglages du dispositif et à en simplifier la fabrication, seront mieux comprises à la lecture de la description ci-dessous.The invention, as well as additional measures capable of facilitating all of the adjustments of the device and of simplifying its manufacture, will be better understood on reading the description below.

Aux dessins annexés:

  • La figure 1 représente une vue achématique du dispositif associé à un appareil de protection;
  • La figure 2 est une vue en élévation du dispositif;
  • La figure 3 est une vue de côté du dispositif selon la figure 2;
  • La figure 4 est une vue, du dispositif en coupe partielle par le plan PP' des figures 2 et 3, et;
  • La figure 5 montre un agrandissement de la région supérieure du relais magnétique.
In the accompanying drawings:
  • Figure 1 shows a schematic view of the device associated with a protective device;
  • Figure 2 is an elevational view of the device;
  • Figure 3 is a side view of the device according to Figure 2;
  • Figure 4 is a view of the device in partial section through the plane PP 'of Figures 2 and 3, and;
  • Figure 5 shows an enlargement of the upper region of the magnetic relay.

Un dispositif magnéto-thermique 1, visible à la figure 1, est par exemple disposé à l'intérieur d'un appareil de protection 2, de façon qu'un courant circulant à travers une charge et entre les bornes 3 et 4 traverse un relais magnétique 5 et un bilame 6 placés en série. Une palette mobile 33 de ce relais et une extrémité mobile 6a de ce bilame transmettent les déplacements ou déformations qu'ils subissent (éventuellement par l'intermédiaire de moyens ralentisseurs 7 ou de moyens d'association 8 communs à plusieurs bilames identiques) à un organe ou mécanisme de déclenchement brusque 9 dont la libération provoque l'ouverture d'un interrupteur de sécurité 10. Les bornes de cet interrupteur, qui n'ont pas été représentés sont elles-mêmes associées à un circuit de commande apte à établir ou à interrompre de façon connue l'alimentation de la charge.A magneto-thermal device 1, visible in FIG. 1, is for example placed inside a protection device 2, so that a current flowing through a load and between terminals 3 and 4 passes through a relay magnetic 5 and a bimetallic strip 6 placed in series. A movable pallet 33 of this relay and a movable end 6a of this bimetallic strip transmit the displacements or deformations which they undergo (possibly via retarder means 7 or association means 8 common to several identical bimetallic strips) to a member or abrupt tripping mechanism 9, the release of which causes the opening of a safety switch 10. The terminals of this switch, which have not been shown, are themselves associated with a control circuit capable of establishing or interrupting in a known manner the supply of the load.

Le relais 5, visible à la figure 2, comprend une culasse magnétisable 11 ayant deux ailes perpendiculaires 12 et 13 dont la plus courte 12 est, dans l'exemple de réalisation figuré, soudée sur une plaquette de support 14. L'une des pièces 12 ou 14, ou même les deux, présentent une ouverture filetée à pas fin 15 d'axe XX' qui est apte à recevoir une première extrémité filetée 16 d'un noyau magnétisable 17, dont une seconde extrémité opposée 18 se trouve sensiblement en regard d'une extrémité 19 de la branche 13.The relay 5, visible in FIG. 2, comprises a magnetizable yoke 11 having two perpendicular wings 12 and 13, the shortest of which 12 is, in the illustrated embodiment, welded to a support plate 14. One of the parts 12 or 14, or even both, have a fine pitch threaded opening 15 of axis XX 'which is capable of receiving a first threaded end 16 of a magnetizable core 17, including a second opposite end 18 is located substantially opposite one end 19 of branch 13.

Sur ce noyau est emmanchée une carcasse isolante 20, sur laquelle est enroulé, entre deux joues 21,22 de la carcasse, un bobinage 23. La joue inférieure 21 voisine de la branche 12 supporte une pièce conductrice 24 qui est associée à la borne 3 et est soudée à une extrémité 25a du fil de la bobine.On this core is fitted an insulating carcass 20, on which is wound, between two cheeks 21,22 of the carcass, a winding 23. The lower cheek 21 adjacent to the branch 12 supports a conductive part 24 which is associated with the terminal 3 and is soldered to one end 25a of the coil wire.

La joue supérieure 22 présente, dans un plan PP' voisin de l'extrémité 19 et sensiblement perpendiculaire à l'axe XX', voir figures 4 et 5, une gorge 26, qui est ouverte en direction de la face interne 27 de la branche 13 et qui débouche jusqu, à l'alésage intérieur 28 de la carcasse. Cette gorge, qui est ouverte latéralement au moins vers un côté 29 de la joue 22, voir figure 4, reçoit une pièce plate métallique non magnétisable 30 réalisée par exemple en aluminium, en laiton ou en acier inoxydable. Cette pièce, qui peut coulisser dans la gorge à la manière d'un coin 32, présente une dimension radiale "d" supérieure à la distance séparant la face 27 de la surface cylindrique 31 du noyau 17 placée en regard, cette distance étant mesurée lorsque la pièce 30 n'est pas montée.The upper cheek 22 has, in a plane PP 'close to the end 19 and substantially perpendicular to the axis XX', see Figures 4 and 5, a groove 26, which is open towards the internal face 27 of the branch 13 and which opens up to the internal bore 28 of the carcass. This groove, which is open laterally at least towards one side 29 of the cheek 22, see FIG. 4, receives a non-magnetizable metallic flat piece 30 produced for example from aluminum, brass or stainless steel. This part, which can slide in the groove in the manner of a wedge 32, has a radial dimension "d" greater than the distance separating the face 27 of the cylindrical surface 31 of the core 17 placed opposite, this distance being measured when the part 30 is not mounted.

Il en résulte que cette pièce 30 est placée en compression lorsqu'elle est mise en place, ou que le noyau 17 est soumis à une contrainte perpendiculaire à l'axe XX'; un effet de coincement élastique du noyau 17 est donc opéré dans la région où coopèrent l'extrémité 16 et l'ouverture 15 filetées.It follows that this part 30 is placed in compression when it is put in place, or that the core 17 is subjected to a stress perpendicular to the axis XX '; an elastic wedging effect of the core 17 is therefore effected in the region where the end 16 and the opening 15 cooperate.

Lorsque, en l'absence de mesures complémentaires, une rotation est communiquée au noyau pour modifier la valeur de l'entrefer de travail Et qui sépare l'extrémité 18 d'une palette mobile 33, on peut craindre un glissement du coin 32 dans la gorge 26 en raison de la force de frottement qui lui est communuquée.When, in the absence of additional measures, a rotation is communicated to the core to modify the value of the working air gap And which separates the end 18 of a movable pallet 33, one can fear a sliding of the corner 32 in the groove 26 due to the friction force imparted to it.

La pièce 30 comporte par suite une région biseautée 34 qui est suivie d'abord d'une encoche 35, ensuite d'une paroi rectiligne 36; cette paroi et cette région biseautée présentent des largeurs "e" légèrement supérieures à la distance "d"; l'engagement de la pièce 30 est effectué dans le sens de la fléche F en produisant des légères déformations élastiques du noyau et de la branche 13, jusqu'au moment où s'opére un encliquetage de l'encoche 35 sur la surface 31 de l'extrémité 18 du noyau 17.The part 30 consequently comprises a bevelled region 34 which is first followed by a notch 35, then by a rectilinear wall 36; this wall and this bevelled region have widths "e" slightly greater than the distance "d"; the engagement of the part 30 is carried out in the direction of the arrow F by producing slight elastic deformations of the core and of the branch 13, until the snap-action of the notch 35 takes place on the surface 31 of the end 18 of the core 17.

La palette magnétisable 33 qui a été mentionnée ci-dessus pivote autour d'une arête 37 placée à l'extrémité 19 de la branche 13, perpendiculairement à l'axe XX' et est soumise à une force de rappel délivrée par un ressort 38.The magnetizable pallet 33 which has been mentioned above pivots around an edge 37 placed at the end 19 of the branch 13, perpendicular to the axis XX 'and is subjected to a restoring force delivered by a spring 38.

Le maintien et le guidage en position de repos de cette palette sont opérés, d'une part grâce à une languette 39 qui est placée dans le prolongement axial de la branche 13 pour traverser une ouverture 40 de cette palette et, d'autre part, grâce à deux oreilles 41, 42 qui entourent latéralement celle-ci, voir figures 3 et 5.The pallet is held and guided in the rest position, on the one hand by means of a tongue 39 which is placed in the axial extension of the branch 13 to pass through an opening 40 in this pallet and, on the other hand, by means of two ears 41, 42 which surround the latter laterally, see FIGS. 3 and 5.

Afin d'assurer la qualité du pivot formé par l'arête 37, les deux oreilles 41, 42 sont portées par une pièce plate découpée 43, qui est fixée sur la face externe 44 de la branche 13, par exemple à l'aide de points de soudure 45; une entaille 46, qui se trouve entre les oreilles 41,42 à la partie supérieure, est placée plus bas que l'arête 37 et à un niveau tel qu'aucun contact matériel ne soit établi avec la face inférieure 48 de cette palette.In order to ensure the quality of the pivot formed by the edge 37, the two ears 41, 42 are carried by a cut flat piece 43, which is fixed to the external face 44 of the branch 13, for example using solder points 45; a notch 46, which is located between the ears 41, 42 at the upper part, is placed lower than the edge 37 and at a level such that no material contact is established with the lower face 48 of this pallet.

La présence de cette pièce 43 a été mise à profit pour servir de support ajustable au bilame 6,grâce à la forme soudée qui lui a été donnée.The presence of this part 43 has been used to serve as an adjustable support for bimetallic strip 6, thanks to the welded shape which has been given to it.

La portion 47 transversale de la pièce 43 portant les 5 oreilles 41, 42 et les points de soudure 45 est reliée à un prolongement 49 sensiblement perpendiculaire par une portion étranglée 50. Cette portion étranglée est voisine d'une première patte coudée 51 qui est reliée à l'extrémité 25b du bobinage passant à travers une échancrure 52 de la 10 branche 13 de la culasse, tandis qu'une seconde patte coudée 53, équipée d'un doigt 54 pour accrocher le ressort 38, est portée par le prolongement 49. Par ailleurs, un bord 55 du prolongement 49, qui est incliné par rapport à l'axe XX, se trouve placé contre l'extrémité 56 d'une vis 57, d'axe parallèle à XX', qui est engagée dans une ouverture filetée 58 de la plaquette 14. Cette plaquette comporte enfin des moyens de fixation, non représentés, qui permettent de l'associer rigidement à une paroi fixe 59 de l'appareil. La position de l'extrémité supérieure 6a du bilame 6, qui 20 est parallèle à l'axe XX' et dont l'extrémité inférieure 6b est fixée sur la patte 53, peut être ajustée dans la direction G grâce au déplacement latéral effectué par le bord 55 lorsque la vis 57 est déplacée le long de son axe; ce déplacement est rendu possible par la déformation élastique que peut subir la portion étranglée 50. La répartition des masses magnétiques de la culasse et de la palette n'est pas sensiblement modifiée par les déplacements du prolongement, 49 en raison de la position de ce dernier contre la face externe 44 et de la présence du coin 32, tandis que la présence de la portion transversale soudée 47 de la pièce 43 dans la région du plan PP' confère à la région 19 de la branche 13 une rigidité qui aurait pu être compromise par la présence de l'échancrure 52.The transverse portion 47 of the part 43 carrying the 5 ears 41, 42 and the welding points 45 is connected to an extension 49 substantially perpendicular by a constricted portion 50. This constricted portion is adjacent to a first bent tab 51 which is connected at the end 25b of the winding passing through a notch 52 of the branch 13 of the cylinder head, while a second bent tab 53, equipped with a finger 54 for hooking the spring 38, is carried by the extension 49. Furthermore, an edge 55 of the extension 49, which is inclined relative to the axis XX, is placed against the end 56 of a screw 57, of axis parallel to XX ', which is engaged in a threaded opening 58 of the plate 14. This plate finally comprises fixing means, not shown, which allow it to be rigidly associated with a fixed wall 59 of the device. The position of the upper end 6a of the bimetallic strip 6, which is parallel to the axis XX 'and whose lower end 6b is fixed on the tab 53, can be adjusted in the direction G by virtue of the lateral displacement effected by the edge 55 when the screw 57 is moved along its axis; this movement is made possible by the elastic deformation which the constricted portion 50 can undergo. The distribution of the magnetic masses of the cylinder head and of the pallet is not appreciably modified by the movements of the extension, 49 due to the position of the latter against the external face 44 and the presence of the wedge 32, while the presence of the welded transverse portion 47 of the part 43 in the region of the plane PP 'gives the region 19 of the branch 13 a rigidity which could have been compromised by the presence of the notch 52.

De façon connue, une première extrémité d'une chaufferette 6c est reliée à l'extrémité 6a du bilame, tandis qu'une seconde extrémité 6d est reliée par un conducteur 60 à la borne 4, voir figures 2 et 3.In known manner, a first end of a heater 6c is connected to the end 6a of the bimetallic strip, while a second end 6d is connected by a conductor 60 to the terminal 4, see FIGS. 2 and 3.

Le mouvement angulaire de la palette 33 est communiqué, dans le sens L, par un poussoir 61 venant d'une pièce avec un capuchon en matière plastique 62 qui est fixé sur cette palette.The angular movement of the pallet 33 is communicated, in the direction L, by a pusher 61 coming from one piece with a plastic cap 62 which is fixed on this pallet.

On constate, en particulier à l'examen de la figure 4, que le flux de fuite qui passe dans l'entrefer Ef conserve, grâce à la présence du coin 32, une valeur bien définie, même si les moyens de fixation utilisés pour associer le relais 5 au boîtier 59 de l'appareil ou l'action de la vis 57 sur la branche 13 produisent de légères déformations de la culasse. Enfin, si l'on souhaite que l'axe XX' du noyau soit parfaitement parallèle au plan de la branche 13 de la culasse, après la mise en place du coin, on peut donner à l'axe de l'ouverture filetée 15 une direction faisant avec ce plan, et avant mise en placé du coin, un petit angle dont le sommet est placé du côté opposé à cette ouverture.It can be seen, in particular on examining FIG. 4, that the leakage flow which passes through the air gap E f retains, thanks to the presence of the wedge 32, a well-defined value, even if the fixing means used for associating the relay 5 with the housing 59 of the device or the action of the screw 57 on the branch 13 produce slight deformations of the cylinder head. Finally, if we want the axis XX 'of the nucleus to be perfectly parallel to the plane of the branch 13 of the cylinder head, after the insertion of the wedge, the axis of the threaded opening 15 can be given a direction making with this plane, and before positioning of the wedge, a small angle the top of which is placed on the side opposite this opening.

Claims (5)

1. A magneto-thermal device adapted for causing the opening of a safety switch when the current which passes therethrough presents either an excessive instantaneous intensity or a smaller intensity, but of too long a duration, said device comprising a bi-metallic strip (6), a magnetizable yoke (11) with which are associated, on the one hand, an adjustable screwed core (17) which is surreounded by a coil (23) and on the other hand a plate (33) angularly movable about one end of the yoke (11) for cooperating with an end (18) of this core (17) placed substantially at the same level and against a return spring (38) and locking means associated with this core (17) for ensuring the adjustment position, characterized in that, in a plane (PP') perpendicular to the axis (XX') of the core (17) and adjacent the end (19) of the yoke (11) serving as a pivot for the plate (33), a flat non magnetizable piece (30) is placed under radial compression between the end (18) of the core and a face (27) of the leg (13) of the yoke situated opposite, the radial dimension ("d") of said piece being slightly greater than the distance which separates said end and said face in the absence of said piece.
2. The magneto-thermal device as claimed in claim 1, characterized in the said non magnetizable flat piece (30) is guided in its plane (PP') by a groove (26) which is placed in a flange (22) of the shell of the coil (23) and extends as far as the inner bore (28) of said shell receiving the adjustable core (17).
3. The magneto-thermal device as claimed in claim 1 or 2, characterized in that said non magnetizable flat piece (30) has the shape of a wedge (32) with a bevelled edge (34) followed by a notch (35) adapted for cooperation with the endmost cylindrical surface (31) of said core (17).
4. The magneto-thermal device as claimed in one of claims 1 to 3, characterized in that said non magnetizable flat piece (30) bears on an internal surface (27) of the end (19) of the leg (13) of the yoke (11) which is opposite an external face (44) bearing means (43) for supporting and adjusting a bi-metallic strip (6).
5. The magneto-thermal device as claimed in claim 4, characterized in that said support means (43) comprise a first transverse portion (47) which is firmly secured to said leg (13) substantially in the plane (PP') of the flat piece (30) and a second axial portion (49) which is connected to the first one by a constricted portion (50) capable of being deformed by the action of a screw (57) parallel to the axis (XX') of the mobile core, the bi-metallic strip (6) being fixed axially to this second portion.
EP84400206A 1983-02-23 1984-01-31 Magneto-thermal device for overcurrent relay Expired EP0117788B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84400206T ATE22505T1 (en) 1983-02-23 1984-01-31 MAGNETO-THERMAL DEVICE FOR OVERCURRENT RELAYS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8302909A FR2541508A1 (en) 1983-02-23 1983-02-23 MAGNETO-THERMAL DEVICE FOR OVERCURRENT RELAY
FR8302909 1983-02-23

Publications (2)

Publication Number Publication Date
EP0117788A1 EP0117788A1 (en) 1984-09-05
EP0117788B1 true EP0117788B1 (en) 1986-09-24

Family

ID=9286177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400206A Expired EP0117788B1 (en) 1983-02-23 1984-01-31 Magneto-thermal device for overcurrent relay

Country Status (10)

Country Link
US (1) US4535309A (en)
EP (1) EP0117788B1 (en)
JP (1) JPS59160932A (en)
AT (1) ATE22505T1 (en)
BR (1) BR8400792A (en)
CA (1) CA1200267A (en)
DE (2) DE3460785D1 (en)
DK (1) DK95784A (en)
ES (1) ES8501165A1 (en)
FR (1) FR2541508A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0346728A (en) * 1989-07-13 1991-02-28 Omron Corp Electromagnetic relay
US5866996A (en) * 1996-12-19 1999-02-02 Siemens Energy & Automation, Inc. Contact arm with internal in-line spring
US6087914A (en) * 1996-12-19 2000-07-11 Siemens Energy & Automation, Inc. Circuit breaker combination thermal and magnetic trip actuator
US5844188A (en) * 1996-12-19 1998-12-01 Siemens Energy & Automation, Inc. Circuit breaker with improved trip mechanism
US5894260A (en) * 1996-12-19 1999-04-13 Siemens Energy & Automation, Inc. Thermal sensing bi-metal trip actuator for a circuit breaker
JP2010009906A (en) * 2008-06-26 2010-01-14 Fuji Electric Fa Components & Systems Co Ltd Thermal relay
DE102016105341B4 (en) * 2016-03-22 2022-05-25 Eaton Intelligent Power Limited protective switching device
CN108461362B (en) * 2017-02-22 2020-06-30 浙江正泰电器股份有限公司 Method for assembling circuit breaker

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1825312A (en) * 1925-10-17 1931-09-29 Cutler Hammer Inc Circuit controller
US3275959A (en) * 1964-12-15 1966-09-27 Zinsco Electrical Products Circuit breaker with externally adjustable tripping mechanism
GB1401181A (en) * 1971-10-19 1975-07-16 Crabtree & Co Ltd J A Circuit breakers and the like electrical products

Also Published As

Publication number Publication date
DE117788T1 (en) 1984-12-20
US4535309A (en) 1985-08-13
DK95784D0 (en) 1984-02-23
FR2541508A1 (en) 1984-08-24
DK95784A (en) 1984-08-24
CA1200267A (en) 1986-02-04
EP0117788A1 (en) 1984-09-05
ES529987A0 (en) 1984-11-01
DE3460785D1 (en) 1986-10-30
BR8400792A (en) 1984-09-25
ATE22505T1 (en) 1986-10-15
ES8501165A1 (en) 1984-11-01
JPS59160932A (en) 1984-09-11
FR2541508B1 (en) 1985-03-22

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