EP0831510B1 - Bimetallic thermal triggering apparatus for a protection device - Google Patents
Bimetallic thermal triggering apparatus for a protection device Download PDFInfo
- Publication number
- EP0831510B1 EP0831510B1 EP97401850A EP97401850A EP0831510B1 EP 0831510 B1 EP0831510 B1 EP 0831510B1 EP 97401850 A EP97401850 A EP 97401850A EP 97401850 A EP97401850 A EP 97401850A EP 0831510 B1 EP0831510 B1 EP 0831510B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bimetallic strip
- plate
- foot
- triggering apparatus
- thermal triggering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
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
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H2037/525—Details of manufacturing of the bimetals, e.g. connection to non bimetallic elements or insulating coatings
-
- 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
Definitions
- the present invention relates to a triggering device thermal bimetal for an electrical overcurrent protection device, such as a thermal relay or a circuit breaker, according to the preamble of claim 1, as it is known for example from document FR-A-2 553 928.
- the role of the thermal trip device is ensure the protection of an electrical installation supplied via the device against overload currents, the temperature rise of the bimetallic strip being representative of the overload and determining, the triggering of the protective device when it reaches a threshold predetermined.
- the bimetallic strip generally has a first free end able to deform, and a second end fixed to a support sole in conductive material.
- the mounting of the bimetallic strip can be carried out by embedding the second end in a recess in the sole.
- the heating of the bimetallic strip is carried out in the usual way by passing the current in an electrically insulated heating coil, and in contact thermal with the bimetallic strip, but it can also be carried out directly by passing the running through the bimetallic strip.
- the invention therefore proposes to provide a device for bimetal thermal release without heating winding to achieve a economic gain in the manufacture of protective devices, and whose characteristics allow a tripping time greater than one normalized value.
- connection point is located at a determined distance from the face bottom of the plate, so that we can determine, by the simple choice of this distance, the calibration of the protective device.
- Figure 1 is an elevational view of the device of the invention.
- the thermal trip device illustrated in Figure 1, is intended to be integrated into an electrical protection device, for example a motor circuit breaker, to detect overload currents after a determined time.
- the thermal trip device comprises a bimetallic strip 10 which directly constitutes the heating element.
- the bimetallic strip 10 is fixed to a support plate 20; the wafer 20 is made of an electrically conductive material and is connected by a first end 21 to a conductive part of current output not shown connected to a pole circuit breaker power.
- the bimetallic strip 10 is thin, of generally elongated rectangular shape extending in a QQ 'plane. It includes a first free end 11 capable of being deform, and a second end or foot 12 intended to be electrically connected to a current input conductive part 30 connected to a connection terminal.
- the support plate 20 of generally rectangular shape, of given thickness e , extends in a plane PP 'perpendicular to the plane QQ'. It comprises in the vicinity of a second end 22 a rectangular recess 23 which extends parallel to the longitudinal direction of the wafer.
- the bimetallic strip 10 crosses the plate 20 through the recess 23, its two large opposite lateral faces 13 being located in the plane QQ 'parallel to the longitudinal direction of the wafer.
- the width of the recess 23 is adjusted to the thickness of the bimetallic strip to allow the latter to be embedded.
- the bimetallic strip has on one of its longitudinal sections 14 a shoulder 15 bearing against the upper face 20a of the plate 20 to seat the bimetallic strip on the plate.
- the position of the shoulder 15 is provided so that the foot 12 of the bimetal strip projects over a height h below the lower face 20b of the plate 20.
- the width l of the foot 12 of the bimetallic strip below the shoulder 15 is at more equal to the width l 'of the upper part 11a of the bimetallic strip situated above the brochure.
- the mechanical fixing of the bimetallic strip 10 to the plate 20 is established by welding, for example laser welding, which can be carried out at the face upper 20a of the wafer and / or at its lower face 20b.
- the welding also promotes the electrical connection between the bimetallic strip 10 and the plate 20.
- connection braid 40 The projection of the foot 12 of the bimetallic strip is electrically connected to the part conductive 30 by a connection braid 40; the braid 40 is welded on one side in an electrical connection point 16 of the foot 12 and on the other side at one end 31 of the part 30.
- the connection braid 40 can also constitute a metal strip or an extension of the conductive part 30.
- connection point 16 is chosen over the height h at a determined distance d which depends on the calibration of the electrical appliance. It is advantageously made on the foot 12 and not on the upper part 11a of the bimetallic strip so as not to damage it. The direct heating of the bimetallic strip is therefore carried out at the level of the foot 12 and of the weld made between the foot and the plate.
- the calorific power necessary for the deformation of the end 11 of the bimetallic strip remains substantially constant, it is therefore necessary to ability to modify the ohmic resistance R of the bimetallic strip as a function of the the device.
- the ohmic resistance R is all the smaller the caliber of the device, representative of the nominal current, is large.
- the resistance R can thus be modified as a function of the distance d and / or the width l of the foot 12.
- the distance d is all the smaller the higher the gauge and the width l is all the smaller as the caliber is low.
- the bimetallic strip comprises an intermediate layer of copper.
- the conductive part 30 extends in a plane perpendicular to the PP plan; it includes a rising branch 32 whose lower end 31 is connected to the connection braid 40, and a descending branch 33 whose end bent upper 34 is connected to the upper end of the rising leg 32.
- the descending branch 33 has at its lower end 35 an extension bent 36 perpendicular to the branches 32, 33 and situated parallel to the plane PP '; the extension 36 is electrically connected to a connection terminal (not shown).
- the shape of the part 30 makes it possible to obtain a temperature gradient sufficient between bimetallic strip 10 and the current input connection terminal of so that the temperature of the latter is low compared to that of the bimetallic strip.
Landscapes
- Thermally Actuated Switches (AREA)
Description
La présente invention se rapporte à un dispositif de déclenchement thermique à bilame pour un appareil électrique de protection contre les surintensités, tel qu'un relais thermique ou un disjoncteur, selon le préambule de la revendication 1, comme il est connu par example du document FR-A-2 553 928.The present invention relates to a triggering device thermal bimetal for an electrical overcurrent protection device, such as a thermal relay or a circuit breaker, according to the preamble of claim 1, as it is known for example from document FR-A-2 553 928.
Dans un tel appareil, le rôle du dispositif de déclenchement thermique est d'assurer la protection d'une installation électrique alimentée via l'appareil contre les courants de surcharge, l'échauffement du bilame étant représentatif de la surcharge et déterminant, le déclenchement de l'appareil de protection lorsqu'il atteint un seuil prédéterminé.In such an apparatus, the role of the thermal trip device is ensure the protection of an electrical installation supplied via the device against overload currents, the temperature rise of the bimetallic strip being representative of the overload and determining, the triggering of the protective device when it reaches a threshold predetermined.
Le bilame présente d'une manière générale une première extrémité libre apte à se déformer, et une seconde extrémité fixée à une semelle de support en matériau conducteur. Le montage du bilame peut être réalisé par l'encastrement de la seconde extrémité dans un évidement de la semelle.The bimetallic strip generally has a first free end able to deform, and a second end fixed to a support sole in conductive material. The mounting of the bimetallic strip can be carried out by embedding the second end in a recess in the sole.
L'échauffement du bilame est réalisé de manière usuelle par passage du courant dans un enroulement de chauffage électriquement isolé, et en contact thermique avec le bilame, mais il peut être aussi réalisé directement par passage du courant à travers le bilame.The heating of the bimetallic strip is carried out in the usual way by passing the current in an electrically insulated heating coil, and in contact thermal with the bimetallic strip, but it can also be carried out directly by passing the running through the bimetallic strip.
S'il y a passage direct du courant à travers le bilame, sans l'utilisation d'un enroulement de chauffage, le courant provenant de la semelle chauffe immédiatement le bilame ; en cas de surcharge , la déformation de l'extrémité libre est alors rapide, ce qui engendre un temps de déclenchement notablement court.If there is a direct current flow through the bimetallic strip, without the use of a heating winding, the current coming from the soleplate heats up immediately the bimetallic strip; in the event of an overload, the deformation of the free end is then fast, which generates a remarkably short tripping time.
Ce type de dispositif permet une fabrication avantageusement économique de l'appareil de protection. Cependant, pour certaines installations électriques de type départ moteur, le déclenchement de l'appareil de protection en cas de surcharge ne doit pas être prématuré et nécessite donc un temps de réponse déterminé, ce qui n'est réalisable que par la présence de l'enroulement de chauffage.This type of device advantageously allows manufacturing protection device. However, for some installations motor starter type electrical devices, the triggering of the protective device in overload should not be premature and therefore requires response time determined, which is only achievable by the presence of the heating coil.
L'invention se propose, par suite, de foumir un dispositif de déclenchement thermique à bilame sans enroulement de chauffage pour réaliser un gain économique dans la fabrication des appareils de protection, et dont les caractéristiques permettent d'obtenir un temps de déclenchement supérieur à une valeur normalisée.The invention therefore proposes to provide a device for bimetal thermal release without heating winding to achieve a economic gain in the manufacture of protective devices, and whose characteristics allow a tripping time greater than one normalized value.
Selon l'invention le dispositif comprend un bilame électriquement conducteur et une plaquette d' épaisseur donnée, servant de support au bilame, le bilame ayant une première extrémité libre apte à se déformer et une seconde extrémité, ou pied, encastrée dans un évidement de la plaquette, caractérisé en ce que :
- le pied du bilame traverse l'évidement de façon à être en saillie en-dessous de la face inférieure de la plaquette d'une hauteur amplement supérieure à l'épaisseur de la plaquette;
- la saillie du pied présente un point de connexion électrique à une pièce conductrice de manière à constituer l'élément de chauffage direct du bilame.
- the foot of the bimetallic strip passes through the recess so as to protrude below the underside of the wafer of a height that is much greater than the thickness of the wafer;
- the projection of the foot has an electrical connection point to a conductive part so as to constitute the direct heating element of the bimetallic strip.
Le point de connexion est situé à une distance déterminée de la face inférieure de la plaquette, de sorte que l'on peut déterminer, par le simple choix de cette distance, le calibrage de l'appareil de protection.The connection point is located at a determined distance from the face bottom of the plate, so that we can determine, by the simple choice of this distance, the calibration of the protective device.
D'autres caractéristiques et avantages de l'invention apparaítront mieux dans la description qui suit, en regard au dessin annexé donné à titre d'exemple.Other characteristics and advantages of the invention will appear better in the description which follows, with reference to the attached drawing given by way of example.
La figure 1 est une vue en élévation du dispositif de l'invention.Figure 1 is an elevational view of the device of the invention.
Le dispositif de déclenchement thermique, ilustré à la figure 1, est destiné à être intégré à un appareil électrique de protection, par exemple un disjoncteur-moteur, pour détecter les courants de surcharge au bout d'un temps déterminé.The thermal trip device, illustrated in Figure 1, is intended to be integrated into an electrical protection device, for example a motor circuit breaker, to detect overload currents after a determined time.
Le dispositif de déclenchement thermique comporte un bilame 10 qui
constitue directement l'élément chauffant.The thermal trip device comprises a
Le bilame 10 est fixé à une plaquette de support 20 ; la plaquette 20 est
réalisée en un matériau électriquement conducteur et est reliée par une première
extrémité 21 à une partie conductrice de sortie de courant non figurée reliée à un pôle
de puissance du disjoncteur.The
Le bilame 10 est mince, de forme générale rectangulaire allongée
s'étendant dans un plan QQ'. Il comprend une première extrémité libre 11 apte à se
déformer, et une seconde extrémité ou pied 12 destinée à être reliée électriquement à
une pièce conductrice 30 d'entrée de courant reliée à une borne de raccordement.The
La plaquette de support 20 de forme générale rectangulaire, d'épaisseur
donnée e, s'étend dans un plan PP' perpendiculaire au plan QQ'. Elle comporte au
voisinage d'une seconde extrémité 22 un évidement rectangulaire 23 qui s'étend
parallèlement à la direction longitudinale de la plaquette.The
Le bilame 10 traverse la plaquette 20 par l'évidement 23, ses deux
grandes faces latérales opposées 13 étant situées dans le plan QQ' parallèlement à
la direction longitudinale de la plaquette. La largeur de l'évidement 23 est ajustée à
l'épaisseur du bilame pour permettre l'encastrement de ce dernier.The
Le bilame présente sur l'une de ses tranches longitudinales 14 un
épaulement 15 venant en appui contre la face supérieure 20a de la plaquette 20 pour
asseoir le bilame sur la plaquette. La position de l'épaulement 15 est prévue de
manière que le pied 12 du bilame soit en saillie sur une hauteur h en dessous de la
face inférieure 20b de la plaquette 20.The bimetallic strip has on one of its longitudinal sections 14 a
La largeur ℓ du pied 12 du bilame en dessous de l'épaulement 15 est au
plus égale à la largeur ℓ' de la partie supérieure 11a du bilame située au-dessus de la
plaquette.The width ℓ of the
La fixation mécanique du bilame 10 à la plaquette 20 est établie par
soudage, par exemple un soudage laser, qui peut être effectué au niveau de la face
supérieure 20a de la plaquette et/ou au niveau de sa face inférieure 20b. La soudure
favorise par ailleurs la liaison électrique entre le bilame 10 et la plaquette 20.The mechanical fixing of the
La saillie du pied 12 du bilame est reliée électriquement à la pièce
conductrice 30 par une tresse de connexion 40 ; la tresse 40 est soudée d'un côté en
un point de connexion électrique 16 du pied 12 et de l'autre côté à une extrémité 31
de la pièce 30. La tresse de connexion 40 peut aussi constituer un feuillard métallique
ou un prolongement de la pièce conductrice 30.The projection of the
Le point de connexion 16 est choisi sur la hauteur h à une distance
déterminée d qui est fonction du calibrage de l'appareil électrique. Il est
avantageusement réalisé sur le pied 12 et non sur la partie supérieure 11a du bilame
afin de ne pas détériorer celle-ci. L'échauffement direct du bilame est donc réalisé au
niveau du pied 12 et de la soudure faite entre le pied et la plaquette.The
On sait que la puissance calorique nécessaire à la déformation de
l'extrémité 11 du bilame reste sensiblement constante, il est donc nécessaire de
pouvoir faire modifier la résistance ohmique R du bilame en fonction du calibre de
l'appareil. La résistance ohmique R est d'autant plus petite que le calibre de l'appareil,
représentatif de l'intensité nominale, est grand.We know that the calorific power necessary for the deformation of
the
La résistance R peut ainsi être modifiée en fonction de la distance d et/ou
de la largeur ℓ du pied 12. La distance d est d'autant plus petite que le calibre est
élevé et la largeur ℓ est d'autant plus petite que le calibre est faible.The resistance R can thus be modified as a function of the distance d and / or the width ℓ of the
Il est aussi possible pour adapter la résistance R, en particulier pour la diminuer, que le bilame comprenne une couche intermédiaire de cuivre.It is also possible to adapt the resistance R, in particular for the decrease, that the bimetallic strip comprises an intermediate layer of copper.
Enfin, la pièce conductrice 30 s'étend dans un plan perpendiculaire au
plan PP' ; elle comprend une branche montante 32 dont l'extrémité inférieure 31 est
reliée à la tresse de connexion 40, et une branche descendante 33 dont l'extrémité
supérieure coudée 34 est reliée à l'extrémité supérieure de la branche montante 32.
La branche decendante 33 présente à son extrémité inférieure 35 un prolongement
coudé 36 perpendiculaire aux branches 32, 33 et situé parallèlement au plan PP'; le
prolongement 36 est connecté électriquement à une borne de raccordement (non
représentée).Finally, the
La forme de la pièce 30 permet d'obtenir un gradient de température
suffisant entre le bilame 10 et la borne de raccordement d'entrée de courant de
manière que la température de ce dernier soit basse par rapport à celle du bilame.The shape of the
Claims (4)
- Thermal triggering apparatus, for a protection device featuring an electrically conductive bimetallic strip (10) and a plate (20) of thickness (e) which supports the bimetallic strip and which is connected by a first end to a conductive part of the current output. The bimetallic strip has a first end (11) free that is capable of deforming and a second end or foot (12) which is fitted into a cavity (23) in the plate (20) characterised in that:the foot (12) of the bimetallic strip (10) passes through the cavity (23) so that it protrudes below the bottom face (20b) of the plate (20) by a length (h) that easily exceeds the thickness (e) of the plate.the protruding part of the foot (12) has an electrical connection point (16) linked to a conductive part (30) so as to form the direct heating element of the bimetallic strip (10).
- Thermal triggering apparatus of Claim 1, characterised in that the connection point (16) is situated at a determined distance (d) from the bottom face (20b) of the plate, to suit the rating of the device.
- Thermal triggering apparatus of claim 1 or 2, characterised in that the protruding foot (12) has a width (l) that is at maximum equal to the width (l') of the top half (11a) of the bimetallic strip, situated above the plate so as to form a shoulder (15) that is supported by the top face (20a) of the plate when the foot (12) of the bimetallic strip passes through it.
- Thermal triggering apparatus as claimed in any of the above Claims, characterised in that the conductive part (30) extends in parallel to the bimetallic strip (10) and has a rising arm (32) whose bottom end (31) is connected electrically to the connection point (16), and a descending arm (33) whose bent top end (34) is connected to the rising arm (32), the descending arm (33) having at its bottom end (35) a bent extension (36) which is perpendicular to the arms (32, 33) and electrically connected to a connection terminal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9611649 | 1996-09-23 | ||
| FR9611649A FR2753835B1 (en) | 1996-09-23 | 1996-09-23 | THERMAL TRIGGERING DEVICE FOR PROTECTIVE APPARATUS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0831510A1 EP0831510A1 (en) | 1998-03-25 |
| EP0831510B1 true EP0831510B1 (en) | 2001-10-17 |
Family
ID=9496035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97401850A Expired - Lifetime EP0831510B1 (en) | 1996-09-23 | 1997-07-31 | Bimetallic thermal triggering apparatus for a protection device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5844466A (en) |
| EP (1) | EP0831510B1 (en) |
| DE (1) | DE69707387T2 (en) |
| FR (1) | FR2753835B1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6445274B1 (en) * | 2000-11-10 | 2002-09-03 | Eaton Corporation | Circuit interrupter with thermal trip adjustability |
| US6803850B2 (en) * | 2002-10-10 | 2004-10-12 | Square D Company | Thermal trip assembly and method for producing same |
| DE102004054176A1 (en) * | 2004-11-10 | 2006-05-24 | Abb Patent Gmbh | Thermal release |
| DE102007005135A1 (en) * | 2007-02-01 | 2008-08-07 | Siemens Ag | Electromechanical switching device for protecting electrical lines or consumers and using a thermal coupling in an electromechanical switching device |
| DE102008017472A1 (en) * | 2007-04-28 | 2008-11-06 | Abb Ag | Service switching device |
| US7800478B2 (en) * | 2008-05-30 | 2010-09-21 | Eaton Corporation | Electrical switching apparatus and heater assembly therefor |
| DE102012202153B4 (en) * | 2012-02-14 | 2021-09-16 | Siemens Aktiengesellschaft | Thermomagnetic release for small current ranges as well as electrical switching device with it |
| FR3045931B1 (en) | 2015-12-21 | 2017-12-22 | Schneider Electric Ind Sas | DEVICE FOR ASSEMBLING A BILAME AND A COMPONENT FORMING THE SUPPORT OF THIS BILAME AND ELECTRICAL PROTECTION APPARATUS COMPRISING IT. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2406325A (en) * | 1942-04-29 | 1946-08-27 | Westinghouse Electric Corp | Circuit interrupter |
| DE2448026C3 (en) * | 1974-10-09 | 1978-09-28 | Ellenberger & Poensgen Gmbh, 8503 Altdorf | Directly heated bimetal strip for thermal tripping of an overcurrent switch |
| JPS5696439A (en) * | 1979-12-28 | 1981-08-04 | Fuji Electric Co Ltd | Bimetal unit for circuit breaker |
| FR2553928B1 (en) * | 1983-10-21 | 1986-08-08 | Merlin Gerin | MIXED HEATING BILAMET FOR THERMAL TRIGGER OF A CUTTING APPARATUS |
| GB2205998B (en) * | 1987-05-19 | 1991-03-13 | Crabtree Electrical Ind Ltd | Temperature responsive devices |
| JPH01176621A (en) * | 1987-12-29 | 1989-07-13 | Fuji Electric Co Ltd | Overcurrent trip gear of circuit breaker |
| GB2228829B (en) * | 1989-02-22 | 1992-11-25 | Crabtree Electrical Ind Ltd | Improvements relating to circuit breakers |
-
1996
- 1996-09-23 FR FR9611649A patent/FR2753835B1/en not_active Expired - Fee Related
-
1997
- 1997-07-31 EP EP97401850A patent/EP0831510B1/en not_active Expired - Lifetime
- 1997-07-31 DE DE69707387T patent/DE69707387T2/en not_active Expired - Fee Related
- 1997-08-07 US US08/908,523 patent/US5844466A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69707387D1 (en) | 2001-11-22 |
| FR2753835B1 (en) | 1998-10-30 |
| DE69707387T2 (en) | 2002-05-23 |
| US5844466A (en) | 1998-12-01 |
| EP0831510A1 (en) | 1998-03-25 |
| FR2753835A1 (en) | 1998-03-27 |
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