EP3185275A1 - Device for joining a bimetal strip and a component forming a support for said bimetal strip, and electrical protection unit comprising same - Google Patents

Device for joining a bimetal strip and a component forming a support for said bimetal strip, and electrical protection unit comprising same Download PDF

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Publication number
EP3185275A1
EP3185275A1 EP16194499.6A EP16194499A EP3185275A1 EP 3185275 A1 EP3185275 A1 EP 3185275A1 EP 16194499 A EP16194499 A EP 16194499A EP 3185275 A1 EP3185275 A1 EP 3185275A1
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EP
European Patent Office
Prior art keywords
bimetallic strip
support
length
bimetallic
bimetal
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
EP16194499.6A
Other languages
German (de)
French (fr)
Other versions
EP3185275B1 (en
Inventor
David Couzon
José Garcia
Sylvain Battail
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 Industries SAS
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Schneider Electric Industries SAS
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Publication of EP3185275A1 publication Critical patent/EP3185275A1/en
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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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • 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
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • 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
    • H01H71/7427—Adjusting only the electrothermal 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
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H71/7436—Adjusting the position (or prestrain) of the bimetal
    • 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
    • H01H71/08—Terminals; Connections
    • H01H2071/084—Terminals; Connections specially adapted for avoiding decalibration of trip unit, e.g. bimetal, when fixing conductor wire to connector
    • 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
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating elements
    • 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 present invention relates generally to bimetallic thermal trip units for current-breaking devices, in particular circuit breakers. It relates more particularly to a device for assembling a bimetallic strip and a part serving as support for this bimetallic strip in a current-breaking device, said bimetallic strip being electrically connected by a first end, said free end, to a first connection range. said input, and another end by which the bimetallic is fixed to said support, to a second so-called output connection range.
  • a bimetallic thermal release of a power failure device provides protection against overloads, the heating of the bimetallic strip being representative of the heating of the device or the protected electrical installation, so that to trigger the switchgear when this heating exceeds a predetermined threshold.
  • the heating of the bimetal can be achieved either directly by passing the current through the bimetallic strip, or in a more usual manner, indirectly by passing the current in an insulated electric heater in thermal contact with the bimetallic strip.
  • the document is known FR 2,669,144 describing such an assembly.
  • This document describes the assembly in two perpendicular planes of a bimetallic strip and a conductive flat part serving as a support, this assembly being made by embedding the part lower bimetallic shaped tenon in a recess serving as mortise provided in the support piece.
  • the current flows from an input terminal, through a ribbon surrounding the bimetallic strip, then from the free end of the bimetallic strip, through the length of the bimetallic strip, then through the support of bimetal, then in the winding of an electromagnetic coil which is electrically connected to an output terminal of the apparatus.
  • the bimetallic foot corresponding to the point of attachment of the bimetallic strip on the support, has a reduced section corresponding to the section of the aforementioned tenon.
  • This weak section of the bimetal results in a large power generated by the subset including the bimetallic strip and the support.
  • This section of reduced passage is thus interesting for the weak currents but penalizing for the strong currents.
  • the present invention solves this problem and proposes a device for assembling a bimetallic strip on its support making it possible to increase the operating current of the apparatus which comprises it while keeping the same size of this apparatus, as well as an apparatus power failure device comprising such an assembly device.
  • the subject of the present invention is an assembly device of the kind mentioned above, this device being characterized in that this bimetal is mounted through the aforementioned support so that it can be fixed at different points along the length of the this bimetallic strip, said bimetallic strip thus having a first and a second part situated respectively on one side and the other side of the aforementioned support, the first part situated on the side of the free end of the bimetallic strip, corresponding to the so-called useful surface of this bimetal, the length of this useful surface being variable depending on the length of installation of this bimetallic strip in the support, this embedding length being determined according to the caliber of the apparatus in order to obtain a constant thermal stroke, whatever the caliber.
  • the so-called output electrical connection range is electrically connected to the second part of the aforementioned bimetallic strip.
  • the fixation of the bimetallic strip on the support is carried out by welding.
  • the present invention also relates to an electrical protection apparatus comprising a thermal release device comprising a bimetallic strip, this device comprising a device for assembling the bimetallic strip on its support comprising the previously mentioned characteristics taken alone or in combination.
  • this apparatus comprises an electromagnetic tripping device comprising a coil, this coil having a first end electrically connected to the second bimetal portion and a second end electrically connected to the aforementioned output range.
  • this device is a low voltage circuit breaker.
  • thermal-thermal trigger device D belonging to a low-voltage circuit breaker, this device comprising, in a manner known per se, a thermal tripping device T comprising a bimetallic strip 1, and a magnetic tripping device M comprising a coil 2 said triggering devices being connected in series between a so-called input 3 or upstream connection pad connected to the input terminal of the apparatus and a so-called output or downstream connection pad 4 electrically connected to the output terminal of the device.
  • this magnetothermic assembly comprises a thermal assembly T and a magnetic assembly M.
  • This thermal assembly comprises a bimetallic strip 1 supported by a bimetallic support 5, whereas the magnetic assembly M comprises a coil 2 supported by a bead 6, these two sets being supported by an insulating support 7 intended to isolate the different parts to each other.
  • Such a bimetallic thermal release T is intended to provide protection against overloads, the heating of the bimetallic strip 1 being representative of the heating of the device or the protected electrical installation, so as to trigger the switchgear device. when this heating exceeds a predetermined threshold.
  • This heating of the bimetallic strip is achieved by passing the current through the bimetallic strip 1, and indirectly by passing the current through an insulated electric heater 8 in electrical contact with the bimetallic strip 1.
  • This strip-shaped heater 8 is made of a material having a resistivity appropriate and is applied against a thin insulating sleeve 9 surrounding the bimetallic strip 1, approximately between the two ends of the latter.
  • the ribbon 8 has a first end 8a which is electrically connected to a so-called input 3 or upstream connection zone leading to an input terminal (not represented) of current and a second end 8b which is connected to the bimetallic strip 1, by example by electric welding, at a particular point of the bimetallic strip located near the free end 1a thereof.
  • This bimetallic strip is intended to be fixed on the abovementioned bimetallic support 5, which support is intended to be fixed in the housing of the apparatus.
  • This fixation of the bimetal is advantageously carried out by soldering or brazing.
  • This coil 2 is constituted by a winding comprising a first end 2a electrically connected to the bimetallic strip 1, and a second end 2b electrically connected to a so-called downstream connection zone 10 said output connected to an output terminal of the device.
  • the bimetallic strip 1 is mounted through an opening 5a provided in the abovementioned bimetallic support 5 so as to be fixed to said support 5 at different points of the bimetallic strip selected along the length of the bimetallic strip 1.
  • this useful surface of the bimetallic strip corresponds to its first part 1a located above the support 5. The user will thus be able to choose the length of this useful surface according to the size of the apparatus, such as this is more particularly illustrated on the Figures 4 and 5 .
  • the first end 2a of the coil 2 is electrically connected to the bimetallic strip 1 in an area under the attachment zone z of the bimetallic strip 1 on the aforementioned substrate 5 as illustrated in FIGS. Figures 2 and 3 .
  • bimetallic strip 1 corresponds to that used in a device having a small size.
  • the embedding length 1 of the bimetallic strip 1 with respect to the support 5 is minimal, the zone of the bimetallic strip located under the support corresponding substantially to the area necessary for fixing the coil on the bimetallic strip.
  • the deflection of bimetallic strip 1 in the event of an electrical fault of thermal origin results in a curvature of its free end 1a that can be measured by a length x corresponding to a component of this deflection, this component corresponding to the length between the point of attachment f of the bimetallic strip 1 on the support 5 and a point p corresponding to the projection of the free end 1a of the bimetallic strip on an axis X, this axis X being substantially perpendicular to the longitudinal direction of the bimetallic strip.
  • This component x corresponds to the thermal path of the bimetallic strip.
  • bimetallic strip 1 corresponds to that used in a device with a high rating.
  • the embedding length I is increased by a value Y relative to that of the bimetallic strip of the previous figure so as to reduce the effective area 1 b of bimetallic strip 1.
  • the invention therefore proposes to extend bimetal 1 through the part of the bimetallic support 5 called sole, keeping a welding for example laser between the two parts, then directly solder the end 2a of the winding of the coil 2 on the non-functional part 1d bimetal, under said sole.
  • the bimetallic embedding and current conduction functions are separated.
  • the current line no longer passes through the end portion of the bimetallic having a reduced section, as is the case in the prior art.
  • the power generated by this subset is decreased.
  • the embedding height of the bimetallic strip can therefore be adjusted so as to obtain the desired thermal stroke.
  • the point of attachment of the bimetallic strip on its support is raised towards the free end of the bimetallic strip in order to shorten the useful length of the bimetallic strip.
  • this fixing point will be lowered in order to lengthen the useful length of the bimetal and increase its thermal stroke.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)

Abstract

La présente invention concerne un dispositif d'assemblage d'un bilame (1) et d'une pièce servant de support (5) à ce bilame dans un appareil de coupure de courant, ledit bilame (1) étant relié électriquement par une première extrémité (1 a) dite extrémité libre à une première plage de raccordement (3) dite d'entrée, et par une autre extrémité par laquelle ce bilame est fixé au support précité (5), à une seconde plage de raccordement dite de sortie (4). Ce dispositif est caractérisé en ce que ce bilame (1) est monté traversant à travers le support précité (5) de manière à pouvoir être fixé en différents endroits de la longueur de ce bilame, ledit bilame présentant ainsi une première (1 c) et une seconde partie (1 d) situées respectivement d'un côté et de l'autre du support précité (5), la première partie située du côté de l'extrémité libre (1a) du bilame (1), correspondant à la surface dite utile (1 b) de ce bilame, la longueur de cette surface utile étant variable en fonction de la longueur d'encastrement I de ce bilame dans le support (5), cette longueur d'encastrement étant déterminée en fonction du calibre de l'appareil afin d'obtenir une course thermique constante, quelque soit le calibre, ainsi qu'un appareil de protection électrique le comportant.The present invention relates to a device for assembling a bimetallic strip (1) and a part serving as support (5) for this bimetallic strip in a current-breaking device, said bimetallic strip (1) being electrically connected by a first end. (1a) said free end to a first input terminal (3), and at another end through which said bimetal is fixed to said support (5), to a second so-called output connection range (4); ). This device is characterized in that this bimetallic strip (1) is mounted through the aforementioned support (5) so as to be fixed at different points along the length of this bimetallic strip, said bimetallic strip thus having a first (1c) and a second part (1 d) located respectively on one side and the other of said support (5), the first part situated on the side of the free end (1a) of the bimetallic strip (1), corresponding to the said surface; it is useful (1 b) of this bimetallic strip, the length of this useful surface being variable as a function of the embedding length I of this bimetallic strip in the support (5), this embedding length being determined as a function of the gauge of the device in order to obtain a constant thermal stroke, whatever the rating, as well as an electrical protection device comprising it.

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention se rapporte d'une manière générale aux déclencheurs thermiques à bilames pour des appareils de coupure de courant, notamment des disjoncteurs. Elle concerne plus particulièrement un dispositif d'assemblage d'un bilame et d'une pièce servant de support à ce bilame dans un appareil de coupure de courant, ledit bilame étant relié électriquement par une première extrémité dite extrémité libre à une première plage de raccordement dite d'entrée, et par une autre extrémité par laquelle ce bilame est fixé au support précité, à une seconde plage de raccordement dite de sortie.The present invention relates generally to bimetallic thermal trip units for current-breaking devices, in particular circuit breakers. It relates more particularly to a device for assembling a bimetallic strip and a part serving as support for this bimetallic strip in a current-breaking device, said bimetallic strip being electrically connected by a first end, said free end, to a first connection range. said input, and another end by which the bimetallic is fixed to said support, to a second so-called output connection range.

ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART

Il est connu qu'un déclencheur thermique à bilame d'un appareil de coupure de courant assure une protection contre les surcharges, l'échauffement du bilame étant représentatif de l'échauffement de l'appareil ou de l'installation électrique protégée, de façon à déclencher l'appareil de coupure lorsque cet échauffement dépasse un seuil prédéterminé. L'échauffement du bilame peut être réalisé soit directement par passage du courant à travers le bilame, soit d'une manière plus usuelle, indirectement par passage du courant dans une chaufferette électrique isolée en contact thermique avec le bilame.It is known that a bimetallic thermal release of a power failure device provides protection against overloads, the heating of the bimetallic strip being representative of the heating of the device or the protected electrical installation, so that to trigger the switchgear when this heating exceeds a predetermined threshold. The heating of the bimetal can be achieved either directly by passing the current through the bimetallic strip, or in a more usual manner, indirectly by passing the current in an insulated electric heater in thermal contact with the bimetallic strip.

Il est également connu d'assembler ce bilame avec une pièce de support réalisée en matériau électriquement conducteur.It is also known to assemble this bimetallic strip with a support piece made of electrically conductive material.

On connaît par exemple le document FR 2 669 144 décrivant un tel assemblage. Ce document décrit l'assemblage dans deux plans perpendiculaires d'un bilame et d'une pièce plate conductrice lui servant de support, cet assemblage étant réalisé par encastrement de la partie inférieure du bilame conformé en tenon dans un évidement faisant office de mortaise prévu dans la pièce de support.For example, the document is known FR 2,669,144 describing such an assembly. This document describes the assembly in two perpendicular planes of a bimetallic strip and a conductive flat part serving as a support, this assembly being made by embedding the part lower bimetallic shaped tenon in a recess serving as mortise provided in the support piece.

Dans un tel dispositif, le courant circule à partir d'une borne d'entrée, à travers un ruban entourant le bilame, puis à partir de l'extrémité libre du bilame, à travers la longueur du bilame, puis à travers le support de bilame, puis dans l'enroulement d'une bobine électromagnétique laquelle étant reliée électriquement à une borne de sortie de l'appareil.In such a device, the current flows from an input terminal, through a ribbon surrounding the bimetallic strip, then from the free end of the bimetallic strip, through the length of the bimetallic strip, then through the support of bimetal, then in the winding of an electromagnetic coil which is electrically connected to an output terminal of the apparatus.

Dans un tel dispositif, le pied de bilame, correspondant au point de fixation du bilame sur le support, présente une section amoindrie correspondant à la section du tenon précité. Cette section faible du bilame entraîne une puissance importante générée par le sous-ensemble comprenant le bilame et le support. Cette section de passage réduite est donc intéressante pour les faibles courants mais pénalisante pour les forts courants.In such a device, the bimetallic foot, corresponding to the point of attachment of the bimetallic strip on the support, has a reduced section corresponding to the section of the aforementioned tenon. This weak section of the bimetal results in a large power generated by the subset including the bimetallic strip and the support. This section of reduced passage is thus interesting for the weak currents but penalizing for the strong currents.

Or, le problème se pose actuellement de faire passer un courant plus important à volume constant.However, the problem currently arises of passing a larger current at constant volume.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

La présente invention résout ce problème et propose un dispositif d'assemblage d'un bilame sur son support permettant d'augmenter le courant d'emploi de l'appareil qui le comporte en conservant un même encombrement de cet appareil, ainsi qu'un appareil de coupure de courant comportant un tel dispositif d'assemblage.The present invention solves this problem and proposes a device for assembling a bimetallic strip on its support making it possible to increase the operating current of the apparatus which comprises it while keeping the same size of this apparatus, as well as an apparatus power failure device comprising such an assembly device.

A cet effet, la présente invention a pour objet un dispositif d'assemblage du genre précédemment mentionné, ce dispositif étant caractérisé en ce que ce bilame est monté traversant à travers le support précité de manière à pouvoir être fixé en différents endroits de la longueur de ce bilame, ledit bilame présentant ainsi une première et une seconde partie situées respectivement d'un côté et de l'autre du support précité, la première partie située du côté de l'extrémité libre du bilame, correspondant à la surface dite utile de ce bilame, la longueur de cette surface utile étant variable en fonction de la longueur d'encastrement de ce bilame dans le support, cette longueur d'encastrement étant déterminée en fonction du calibre de l'appareil afin d'obtenir une course thermique constante, quelque soit le calibre.For this purpose, the subject of the present invention is an assembly device of the kind mentioned above, this device being characterized in that this bimetal is mounted through the aforementioned support so that it can be fixed at different points along the length of the this bimetallic strip, said bimetallic strip thus having a first and a second part situated respectively on one side and the other side of the aforementioned support, the first part situated on the side of the free end of the bimetallic strip, corresponding to the so-called useful surface of this bimetal, the length of this useful surface being variable depending on the length of installation of this bimetallic strip in the support, this embedding length being determined according to the caliber of the apparatus in order to obtain a constant thermal stroke, whatever the caliber.

Selon une caractéristique particulière, la plage de raccordement électrique dite de sortie, est reliée électriquement à la seconde partie du bilame précitée.According to a particular characteristic, the so-called output electrical connection range is electrically connected to the second part of the aforementioned bimetallic strip.

Selon une autre caractéristique, la fixation du bilame sur le support est réalisée par soudure.According to another characteristic, the fixation of the bimetallic strip on the support is carried out by welding.

La présente invention a encore pour objet un appareil de protection électrique comportant un dispositif de déclenchement thermique comportant un bilame, cet appareil comportant un dispositif d'assemblage du bilame sur son support comportant les caractéristiques précédemment mentionnées prises seules ou en combinaison.The present invention also relates to an electrical protection apparatus comprising a thermal release device comprising a bimetallic strip, this device comprising a device for assembling the bimetallic strip on its support comprising the previously mentioned characteristics taken alone or in combination.

Selon une autre caractéristique, cet appareil comporte un dispositif de déclenchement électromagnétique comportant une bobine, cette bobine comportant une première extrémité reliée électriquement à la seconde partie de bilame précitée et une seconde extrémité reliée électriquement à la plage de sortie précitée.According to another characteristic, this apparatus comprises an electromagnetic tripping device comprising a coil, this coil having a first end electrically connected to the second bimetal portion and a second end electrically connected to the aforementioned output range.

Selon une caractéristique, cet appareil est un disjoncteur basse tension.According to one characteristic, this device is a low voltage circuit breaker.

Mais d'autres avantages et caractéristiques de l'invention apparaîtront mieux dans la description détaillée qui suit et se réfère aux dessins annexés donnés uniquement à titre d'exemple et dans lesquels :

  • La figure 1 est une vue en perspective éclatée d'un dispositif de déclenchement magnétothermique selon l'invention,
  • Les figures 2 et 3 sont deux vues en perspective illustrant ce même dispositif selon deux orientations différentes de manière à montrer deux faces opposées de ce dispositif, et
  • Les figures 4 et 5 illustrent respectivement la déflexion du bilame pour deux appareils présentant respectivement un faible calibre et un fort calibre, lesdits appareils comportant un dispositif d'assemblage selon l'invention.
But other advantages and features of the invention will become more apparent in the detailed description which follows and refers to the accompanying drawings given solely by way of example and in which:
  • The figure 1 is an exploded perspective view of a magnetothermic trip device according to the invention,
  • The Figures 2 and 3 are two perspective views illustrating the same device in two different orientations so as to show two opposite faces of this device, and
  • The Figures 4 and 5 illustrate respectively the deflection of the bimetallic strip for two devices having respectively a low caliber and a high caliber, said devices comprising an assembly device according to the invention.

Sur les figures 1 à 3, on a représenté dispositif de déclenchement dit magnéto-thermique D appartenant à un disjoncteur basse tension, ce dispositif comportant de manière connue en soi, un dispositif de déclenchement thermique T comportant un bilame 1, et un dispositif de déclenchement magnétique M comportant une bobine 2, lesdits dispositifs de déclenchement étant montés en série entre une plage de raccordement dite d'entrée 3 ou amont reliée à la borne d'entrée de l'appareil et une plage de raccordement dite de sortie ou aval 4 reliée électriquement à la borne de sortie de l'appareil.On the Figures 1 to 3 , there is shown said thermal-thermal trigger device D belonging to a low-voltage circuit breaker, this device comprising, in a manner known per se, a thermal tripping device T comprising a bimetallic strip 1, and a magnetic tripping device M comprising a coil 2 said triggering devices being connected in series between a so-called input 3 or upstream connection pad connected to the input terminal of the apparatus and a so-called output or downstream connection pad 4 electrically connected to the output terminal of the device.

Tel qu'illustré sur la figure 1, cet ensemble magnétothermique comporte un ensemble thermique T et un ensemble magnétique M. Cet ensemble thermique comporte un bilame 1 supporté par un support de bilame 5, tandis que l'ensemble magnétique M comporte une bobine 2 supportée par un fut 6, ces deux ensembles étant supportés par un support isolant 7 destiné à isoler les différentes parties les unes aux autres.As illustrated on the figure 1 , this magnetothermic assembly comprises a thermal assembly T and a magnetic assembly M. This thermal assembly comprises a bimetallic strip 1 supported by a bimetallic support 5, whereas the magnetic assembly M comprises a coil 2 supported by a bead 6, these two sets being supported by an insulating support 7 intended to isolate the different parts to each other.

Un tel déclencheur thermique à bilame T est destiné à assurer une protection contre les surcharges, l'échauffement du bilame 1 étant représentatif de l'échauffement de l'appareil ou de l'installation électrique protégée, de façon à déclencher l'appareil de coupure lorsque cet échauffement dépasse un seuil prédéterminé.Such a bimetallic thermal release T is intended to provide protection against overloads, the heating of the bimetallic strip 1 being representative of the heating of the device or the protected electrical installation, so as to trigger the switchgear device. when this heating exceeds a predetermined threshold.

Cet échauffement du bilame est réalisé par passage du courant à travers le bilame 1, et, indirectement par passage du courant dans une chaufferette électrique 8 isolée en contact électrique avec le bilame 1. Cette chaufferette 8 en forme de ruban est réalisée en un matériau ayant une résistivité appropriée et est appliquée contre un mince manchon isolant 9 entourant le bilame 1, approximativement entre les deux extrémités de ce dernier.This heating of the bimetallic strip is achieved by passing the current through the bimetallic strip 1, and indirectly by passing the current through an insulated electric heater 8 in electrical contact with the bimetallic strip 1. This strip-shaped heater 8 is made of a material having a resistivity appropriate and is applied against a thin insulating sleeve 9 surrounding the bimetallic strip 1, approximately between the two ends of the latter.

Le ruban 8 possède une première extrémité 8a qui est électriquement reliée à une plage de raccordement dite d'entrée 3 ou amont menant à une borne d'entrée (non représentée) de courant et une seconde extrémité 8b qui est reliée au bilame 1, par exemple par soudure électrique, en un point particulier du bilame situé à proximité de l'extrémité libre 1 a de celui-ci.The ribbon 8 has a first end 8a which is electrically connected to a so-called input 3 or upstream connection zone leading to an input terminal (not represented) of current and a second end 8b which is connected to the bimetallic strip 1, by example by electric welding, at a particular point of the bimetallic strip located near the free end 1a thereof.

Ce bilame est destiné à être fixé sur le support de bilame précité 5, lequel support est destiné à être fixé dans le boîtier de l'appareil. Cette fixation du bilame est réalisée avantageusement par soudure ou brasage.This bimetallic strip is intended to be fixed on the abovementioned bimetallic support 5, which support is intended to be fixed in the housing of the apparatus. This fixation of the bimetal is advantageously carried out by soldering or brazing.

Cette bobine 2 est constituée par un enroulement comprenant une première extrémité 2a reliée électriquement au bilame 1, et une seconde extrémité 2b reliée électriquement à une plage de raccordement aval 10 dite de sortie reliée à une borne de sortie de l'appareil.This coil 2 is constituted by a winding comprising a first end 2a electrically connected to the bimetallic strip 1, and a second end 2b electrically connected to a so-called downstream connection zone 10 said output connected to an output terminal of the device.

Conformément à l'invention, le bilame 1 est monté traversant à travers une ouverture 5a prévue dans le support de bilame précité 5 de manière à pouvoir être fixé audit support 5 en différents endroits du bilame choisis sur la longueur du bilame 1. Le bilame présente ainsi une première partie 1c située au-dessus du support 5 et située du côté de son extrémité libre 1a, et une seconde partie 1d située en dessous du support 5. On obtient ainsi une position d'encastrement du bilame variable permettant d'obtenir une surface utile 1 b du bilame également variable. On notera que cette surface utile du bilame correspond à sa première partie 1 a située au-dessus du support 5. L'utilisateur pourra ainsi choisir la longueur de cette surface utile en fonction du calibre de l'appareil, tel que ceci est plus particulièrement illustré sur les figures 4 et 5.According to the invention, the bimetallic strip 1 is mounted through an opening 5a provided in the abovementioned bimetallic support 5 so as to be fixed to said support 5 at different points of the bimetallic strip selected along the length of the bimetallic strip 1. The bimetallic strip and a first portion 1c located above the support 5 and located on the side of its free end 1a, and a second portion 1d located below the support 5. This gives a position of embedding the bimetallic variable to obtain a useful surface 1 b bimetallic also variable. It will be noted that this useful surface of the bimetallic strip corresponds to its first part 1a located above the support 5. The user will thus be able to choose the length of this useful surface according to the size of the apparatus, such as this is more particularly illustrated on the Figures 4 and 5 .

La première extrémité 2a de la bobine 2 est reliée électriquement au bilame 1 en une zone située sous la zone de fixation z du bilame 1 sur le support précité 5 tel qu'illustré sur les figures 2 et 3.The first end 2a of the coil 2 is electrically connected to the bimetallic strip 1 in an area under the attachment zone z of the bimetallic strip 1 on the aforementioned substrate 5 as illustrated in FIGS. Figures 2 and 3 .

Sur la figure 4, le bilame 1 correspond à celui utilisé dans un appareil présentant un faible calibre. Sur cette figure, la longueur d'encastrement 1 du bilame 1 par rapport au support 5 est minimale, la zone du bilame située sous le support correspondant sensiblement à la zone nécessaire pour la fixation de la bobine sur le bilame. Dans cette configuration, la déflexion du bilame 1 en cas de défaut électrique d'origine thermique se traduit par une courbure de son extrémité libre 1a pouvant se mesurer par une longueur x correspondant à une composante de cette déflexion, cette composante correspondant à la longueur entre le point de fixation f du bilame 1 sur le support 5 et un point p correspondant à la projection de l'extrémité libre 1a du bilame sur un axe X, cet axe X étant sensiblement perpendiculaire à la direction longitudinale du bilame. Cette composante x correspond à la course thermique du bilame. A cette course thermique du bilame correspond une course mécanique de l'actionneur destiné à coopérer avec ce bilame de manière à provoquer le déclenchement de l'appareil de coupure de courant. Sur la figure 5, le bilame 1 correspond à celui utilisé dans un appareil présentant un calibre élevé. Sur cette figure, la longueur d'encastrement I est augmentée d'une valeur Y par rapport à celle du bilame de la figure précédente de manière à diminuer la surface utile 1 b du bilame 1. L'invention propose donc de prolonger le bilame 1 à travers la partie du support 5 de bilame appelée semelle, en conservant une soudure par exemple au laser entre les deux pièces, puis de souder directement l'extrémité 2a de l'enroulement de la bobine 2 sur la partie 1d non fonctionnelle du bilame, sous ladite semelle.On the figure 4 bimetallic strip 1 corresponds to that used in a device having a small size. In this figure, the embedding length 1 of the bimetallic strip 1 with respect to the support 5 is minimal, the zone of the bimetallic strip located under the support corresponding substantially to the area necessary for fixing the coil on the bimetallic strip. In this configuration, the deflection of bimetallic strip 1 in the event of an electrical fault of thermal origin results in a curvature of its free end 1a that can be measured by a length x corresponding to a component of this deflection, this component corresponding to the length between the point of attachment f of the bimetallic strip 1 on the support 5 and a point p corresponding to the projection of the free end 1a of the bimetallic strip on an axis X, this axis X being substantially perpendicular to the longitudinal direction of the bimetallic strip. This component x corresponds to the thermal path of the bimetallic strip. At this thermal stroke of the bimetallic strip corresponds to a mechanical stroke of the actuator intended to cooperate with this bimetallic strip in such a way as to trigger the breaking device. On the figure 5 bimetallic strip 1 corresponds to that used in a device with a high rating. In this figure, the embedding length I is increased by a value Y relative to that of the bimetallic strip of the previous figure so as to reduce the effective area 1 b of bimetallic strip 1. The invention therefore proposes to extend bimetal 1 through the part of the bimetallic support 5 called sole, keeping a welding for example laser between the two parts, then directly solder the end 2a of the winding of the coil 2 on the non-functional part 1d bimetal, under said sole.

Ainsi, grâce à l'invention, les fonctions d'encastrement du bilame et de conduction du courant sont séparées
Ainsi, la ligne de courant ne passe plus par la partie d'extrémité du bilame présentant une section diminuée, comme ceci est le cas dans l'art antérieur. Ainsi, la puissance générée par ce sous-ensemble est diminuée.Thus, thanks to the invention, the bimetallic embedding and current conduction functions are separated.
Thus, the current line no longer passes through the end portion of the bimetallic having a reduced section, as is the case in the prior art. Thus, the power generated by this subset is decreased.

La hauteur d'encastrement du bilame peut donc être ajustée de manière à obtenir la course thermique souhaitée. Sur les forts courants, le point de fixation du bilame sur son support est remonté en direction de l'extrémité libre du bilame afin de raccourcir la longueur utile du bilame. Sur les faibles courants, ce point de fixation sera descendu afin d'allonger la longueur utile du bilame et augmenter sa course thermique.The embedding height of the bimetallic strip can therefore be adjusted so as to obtain the desired thermal stroke. On strong currents, the point of attachment of the bimetallic strip on its support is raised towards the free end of the bimetallic strip in order to shorten the useful length of the bimetallic strip. On weak currents, this fixing point will be lowered in order to lengthen the useful length of the bimetal and increase its thermal stroke.

Ainsi, une adaptation en fonction du courant est alors possible afin d'obtenir une course thermique constante, ceci permettant d'obtenir une course mécanique constante sur toute la gamme d'un même produit.Thus, an adaptation according to the current is then possible in order to obtain a constant thermal stroke, this making it possible to obtain a constant mechanical stroke over the entire range of the same product.

Du fait de cette diminution de la puissance générée, il est possible de fabriquer un appareil de protection présentant un calibre plus important à volume constant.Due to this decrease in the power generated, it is possible to manufacture a protection device having a larger size at a constant volume.

Bien entendu, l'invention n'est pas limitée aux modes de réalisation décrits et illustrés qui n'ont été donnés qu'à titre d'exemple.Of course, the invention is not limited to the embodiments described and illustrated which have been given by way of example.

Au contraire, l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont réalisées selon son esprit.On the contrary, the invention comprises all the technical equivalents of the means described and their combinations if they are carried out according to its spirit.

Claims (6)

Dispositif d'assemblage d'un bilame et d'une pièce servant de support à ce bilame dans un appareil de coupure de courant, ledit bilame étant relié électriquement par une première extrémité, dite extrémité libre, à une première plage de raccordement dite d'entrée, et par une autre extrémité, par laquelle ce bilame est fixé au support précité, à une seconde plage de raccordement dite de sortie, caractérisé en ce que ce bilame (1) est monté traversant à travers le support précité (5) de manière à pouvoir être fixé en différents endroits de la longueur de ce bilame (1), ledit bilame présentant ainsi une première (1c) et une seconde (1d) partie situées respectivement d'un côté et de l'autre du support précité (5), la première partie située du côté de l'extrémité libre (1a) du bilame (1), correspondant à la surface dite utile (1b) de ce bilame (1), la longueur de cette surface utile (1b) étant variable en fonction de la longueur d'encastrement (1) de ce bilame (1) dans le support (5), cette longueur d'encastrement (1) étant déterminée en fonction du calibre de l'appareil afin d'obtenir une course thermique (x) constante, quelque soit le calibre.Device for assembling a bimetallic strip and a part serving as a support for this bimetallic strip in a current-breaking device, said bimetallic strip being electrically connected by a first end, said free end, to a first connection zone called input, and by another end, by which this bimetal is fixed to the aforementioned support, to a second so-called output connection range, characterized in that this bimetal (1) is mounted through through the aforesaid support (5) so it can be fixed in different places along the length of this bimetallic strip (1), said bimetallic strip thus having a first (1c) and a second (1d) part located respectively on one side and the other side of said support (5) , the first part situated on the side of the free end (1a) of the bimetallic strip (1), corresponding to the so-called useful surface (1b) of this bimetallic strip (1), the length of this useful surface (1b) being variable depending on length of installation (1) of this bimetallic strip (1) in the support (5), this embedding length (1) being determined according to the gauge of the apparatus in order to obtain a constant thermal stroke (x), whatever the rating. Dispositif d'assemblage selon la revendication 1, caractérisé en ce que la plage de raccordement électrique (4) dite de sortie, est reliée électriquement à la seconde partie (1 d) du bilame (1).Connecting device according to claim 1, characterized in that the so-called outlet electrical connection region (4) is electrically connected to the second part (1d) of the bimetallic strip (1). Dispositif d'assemblage selon la revendication 1 ou 2, caractérisé en ce que la fixation du bilame (1) sur le support (5) est réalisé par soudure.Connecting device according to claim 1 or 2, characterized in that the attachment of the bimetal (1) on the support (5) is made by welding. Appareil de protection électrique comportant un dispositif de déclenchement thermique comportant un bilame (1), caractérisé en ce qu'il comporte un dispositif d'assemblage du bilame (1) sur son support (5) selon l'une quelconque des revendications 1 à 3.Electrical protection device comprising a thermal tripping device comprising a bimetallic strip (1), characterized in that it comprises a device for assembling the bimetallic strip (1) on its support (5) according to any one of Claims 1 to 3 . Appareil de protection électrique selon la revendication 4, caractérisé en ce qu'il comporte un dispositif de déclenchement électromagnétique comportant une bobine (2), caractérisé en ce que cette bobine (2) comporte une première extrémité (2a) reliée électriquement à la seconde partie de bilame précitée (1d) et une seconde extrémité (2b) reliée électriquement à la plage de sortie précitée (4)Electrical protection device according to claim 4, characterized in that it comprises an electromagnetic tripping device comprising a coil (2), characterized in that this coil (2) has a first end (2a) electrically connected to the second part of said bimetallic strip (1d) and a second end (2b) electrically connected to said output range (4) Appareil de protection électrique selon la revendication 4 ou 5, caractérisé en ce que c'est un disjoncteur basse tension.Electrical protection device according to claim 4 or 5, characterized in that it is a low-voltage circuit breaker.
EP16194499.6A 2015-12-21 2016-10-19 Device for joining a bimetal strip and a component forming a support for said bimetal strip, and electrical protection unit comprising same Active EP3185275B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1562925A FR3045931B1 (en) 2015-12-21 2015-12-21 DEVICE FOR ASSEMBLING A BILAME AND A COMPONENT FORMING THE SUPPORT OF THIS BILAME AND ELECTRICAL PROTECTION APPARATUS COMPRISING IT.

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EP3185275A1 true EP3185275A1 (en) 2017-06-28
EP3185275B1 EP3185275B1 (en) 2018-08-01

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US (1) US9916955B2 (en)
EP (1) EP3185275B1 (en)
CN (1) CN107017135B (en)
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE462367C (en) * 1928-07-10 Voigt & Haeffner Akt Ges Arrangement for regulating overcurrent heat elements made of bimetal by means of a contact slide that can be set on the bimetal strip
EP0291835A2 (en) * 1987-05-19 1988-11-23 Crabtree Electrical Industries Limited Temperature responsive device and circuit breaker
EP0831510A1 (en) * 1996-09-23 1998-03-25 Schneider Electric Sa Bimetallic thermal triggering apparatus for a protection device
EP2544206A1 (en) * 2011-07-05 2013-01-09 Siemens Aktiengesellschaft Circuit breaker

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4983939A (en) * 1989-10-05 1991-01-08 Westinghouse Electric Corp. Circuit breaker with adjustable low magnetic trip
FR2669144B1 (en) 1990-11-08 1995-02-10 Telemecanique ASSEMBLY OF A BILAME FOR A CURRENT SWITCHING APPARATUS AND A PART SERVING AS A SUPPORT FOR THE BILAME.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE462367C (en) * 1928-07-10 Voigt & Haeffner Akt Ges Arrangement for regulating overcurrent heat elements made of bimetal by means of a contact slide that can be set on the bimetal strip
EP0291835A2 (en) * 1987-05-19 1988-11-23 Crabtree Electrical Industries Limited Temperature responsive device and circuit breaker
EP0831510A1 (en) * 1996-09-23 1998-03-25 Schneider Electric Sa Bimetallic thermal triggering apparatus for a protection device
EP2544206A1 (en) * 2011-07-05 2013-01-09 Siemens Aktiengesellschaft Circuit breaker

Also Published As

Publication number Publication date
CN107017135B (en) 2020-03-13
US9916955B2 (en) 2018-03-13
US20170178852A1 (en) 2017-06-22
FR3045931A1 (en) 2017-06-23
EP3185275B1 (en) 2018-08-01
CN107017135A (en) 2017-08-04
FR3045931B1 (en) 2017-12-22

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