EP0080393B1 - Bimetallanordnung mit einem in Reihe geschalteten Heizelement - Google Patents

Bimetallanordnung mit einem in Reihe geschalteten Heizelement Download PDF

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Publication number
EP0080393B1
EP0080393B1 EP19820402022 EP82402022A EP0080393B1 EP 0080393 B1 EP0080393 B1 EP 0080393B1 EP 19820402022 EP19820402022 EP 19820402022 EP 82402022 A EP82402022 A EP 82402022A EP 0080393 B1 EP0080393 B1 EP 0080393B1
Authority
EP
European Patent Office
Prior art keywords
bimetallic strip
heater
face
opposite
current
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
EP19820402022
Other languages
English (en)
French (fr)
Other versions
EP0080393A1 (de
Inventor
Dominique Moreau
Pierre Duchemin
Francis Castel
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
La Telemecanique Electrique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of EP0080393A1 publication Critical patent/EP0080393A1/de
Application granted granted Critical
Publication of EP0080393B1 publication Critical patent/EP0080393B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element
    • H01H71/164—Heating elements

Definitions

  • the invention relates to a device for detecting current overcurrents, in particular for a protection device.
  • a device for detecting current overcurrents comprising in a housing, on the one hand, a bimetallic strip having a first fixed fixed end and a second free end which is capable of actuating, directly or indirectly, a safety switch fixed in the housing and. on the other hand, an insulated electric heater which is placed in good thermal contact along a first longitudinal face of the bimetallic strip using insulated transverse clamping members and one end of which is connected at a point in the bimetallic strip situated between the ends, so that the current to be monitored passes through the heater and the bimetallic strip, a thin insulating sheet being placed between the heater and said first face.
  • a device of the kind mentioned is known from document DE-A-2 818 203.
  • Such devices are widely used in protective devices, such as thermal relays, the function of which is to indirectly open the supply circuit of a consumer device to be monitored when the currents flowing through it exceed, during a certain time, a particular setpoint.
  • the heater is generally produced in the form of a coil of resistant wire placed around the bimetallic strip.
  • the first condition is that the device must have a response time greater than a standardized value for current overloads of the order of six times the nominal current.
  • the second condition means that the device containing the protective device must not be too large and that the same protective device case must be able to contain different protective devices to be used with currents of nominal currents different.
  • the reduction in this total resistance can itself be obtained either by the reduction in the resistance of the heater, or by that of the bimetallic strip, or by a combined reduction in the two resistances.
  • the value of the ratio between these two resistances influences the response time: when the power dissipated in the bimetallic strip is preponderant. the response time is shorter than otherwise; this response time also becomes shorter when the heater is coiled over the entire length of the bimetallic strip; too short a response time can cause the device to trip prematurely.
  • Bimetallic devices and coiled heater have the advantage of good mechanical strength when short-circuit currents appear due to the low electrodynamic forces which appear between the bimetallic strip, where the direction of the current flows longitudinally and the turns of the heater, where the direction of the current is perpendicular to the previous one.
  • the invention therefore proposes to provide a bimetallic device and heater capable of being traversed by a large nominal current which is capable of having a response time which meets the requirements and which benefits has good mechanical strength, when the bimetallic strip that it uses has dimensions which have been chosen in advance to respond to lower nominal currents, for which a coiled heater is satisfactory.
  • said clamping members are constituted by a multiplicity of opposite deformable lateral tabs, which are cut in opposite regions of the conductive strip, which bypass the two edges of the bimetallic strip, and whose ends are supported by the 'intermediate folded portions of the insulating sheet, on a second longitudinal face opposite the first face.
  • Such a device does not allow an easy adaptation of the response time insofar as one cannot then benefit from the speed of deformation provided by a bimetallic strip which heats up directly in its mass; moreover, the need to fold the copper strip to locate the current input and output in the vicinity of the bimetal root does not provide good thermal efficiency and requires the use of two electrical connection parts instead of a.
  • a protective device visible in FIG. 1, comprises a housing 1 having a multiplicity of housings of given length m such as 2, in each of which is arranged a device for detecting current overcurrents 3; this box which can contain other organs has been deliberately limited in size in the figure.
  • Each device such as 3 is connected, on the one hand, to a current input terminal 4 connected to a phase R of a supply network and, on the other hand, directly or not to an output terminal of current 5 which is connected by a conductor to a corresponding terminal of a current consuming device, not shown.
  • the device 3 comprises a bimetallic strip 6 having a first fixed end 7 which is connected to the terminal 5 and which is made integral with the housing by any suitable means, for example by a screw 8 so as to constitute an embedding; this bimetallic strip has a second end 9 which is free and which cooperates with a transmission device 10 capable of directly or indirectly causing the opening of a safety switch 11 when the end 9 moves by a certain amount.
  • This switch is, for example, placed in series with the coil 12 of an electromagnet belonging to a contactor 14 having power switches 15 placed in the supply circuit of the current-consuming device 16 (see also block diagram in Figure 2).
  • a heater of the type with a coil of resistant wire may be associated with the bimetallic strip.
  • the device 3 uses a heater 17, which consists of a thin conductive strip or ribbon 18 made of a copper material which is a good conductor of the current (see FIGS. 3 and 4).
  • This blade has a first end 19 which is electrically connected with the terminal 4 and a second end 20 which is connected to the bimetallic strip 6, for example by electrical welding, at a particular point 21 thereof situated between the ends 7 and 9.
  • the blade 18 extends longitudinally along a portion 36. of the bimetallic strip and is applied against a thin insulating film 22 which is itself placed against a first face 23 of the bimetallic strip , (see also figure 5).
  • Good thermal transfer between the blade 18 and the face 23, through the insulating sheet 22, is provided by the pressure imparted by two multiplicity of opposite lateral tabs 24, 25 which are placed on either side of the blade 18 and which are curved in such a way that ends such as 26, 27 of each of the legs such as 28, 28 come to bear, by means of the insulating sheet, on a second face 29 opposite the first face 23
  • the insulating sheet 22 has a sufficient width to circumvent, like the legs, the opposite edges 30, 31 of the bimetallic strip and also to present under the ends of the legs, insulating portions 32, 33 of the sheet 22.
  • the heater 17 is made flat, in one piece, by cutting from a suitable metal sheet (see Figure 6), and the legs are then bent by a tool or machine studied for this purpose.
  • the first end 19 of the blade has a lateral extension 34 which is not placed opposite the bimetallic strip, this arrangement making it possible to protect the blade from deformations which could appear when the 'The electrical connection between the heater and a conductor 35 going to terminal 4 is made, for example by welding.
  • the choice of the number of legs and their width depends, on the one hand on the mechanical characteristics of the material used for the blade 18, on the forces which it is necessary to communicate to this blade to make it press well against the insulating sheet and allow it to withstand the electrodynamic forces which appear during short circuits and, on the other hand, precautions taken to avoid that the mechanical association of the heater with the bimetallic strip communicates to it a parasitic rigidity.
  • the materials used for the heater will be, for example, copper or a suitable brass.
  • bimetallic strip comprising a pair of metals having very different coefficients of expansion, such as invar and a Fe-Ni-Cr alloy, or to a bimetallic strip further comprising a couple of metals having very different coefficients of expansion such as those mentioned, an intermediate layer of copper or nickel, when it is necessary to reduce the inherent electrical resistance of the bimetallic strip.

Landscapes

  • Thermally Actuated Switches (AREA)

Claims (2)

1. Vorrichtung zur Detektion von Überstrom (3), insbesondere für Schutzgeräte, welche in einem Gehäuse (1) einerseits einen Bimetallstreifen (6) besitzt, mit einem ersten fest versenkten Ende (7) und einem zweiten freien Ende (9), das direkt oder indirekt einen, im Gehäuse befestigten, Sicherheitsschalter (11) betätigt und, andererseits, ein isoliertes elektrisches Heizelement (17), bestehend aus einer dünnen leitenden Lamelle (18), welche, in gutem Wärmekontakt, entlang einer ersten Längsfläche (23) des Bimetallstreifens (6) verläuft, mit Hilfe von isolierten quer verlaufenden Befestigungselementen, deren eines Ende (20) mit einem, zwischen den Enden befindlichen, Punkt des Bimetallstreifens (6) so verbunden ist, dass der zu überwachende Strom durch das Heizelement (17) und den Bimetallstreifen (6) fliesst, wobei eine dünne Isolierfolie (22) zwischen dem Heizelement (17) und besagter erster Fläche angebracht ist, dadurch gekennzeichnet, dass besagte Befestigungselemente aus einer Vielzahl (24. 25) von einander gegenüberliegenden verformbaren Seitenklammern (28, 28) bestehen die aus gegenüberliegenden Zonen (24, 25) gestanzt sind, die um die zwei Kanten (30, 31) des Bimetallstreifens herumführen und deren Enden (26, 27) sich, mit Hilfe von umgebogenen Abschnitten (32, 33) der Isolierfolie (22), auf eine zweite, der ersten gegenüberliegenden, Längsfläche (29) stützen.
2. Vorrichtung zur Überstromdetektion gemäss Anspruch 1, dadurch gekennzeichnet, dass der Bimetallstreifen (6) ausser zwei Metallen mit sehr verschiedenen Dehnungskoeffizienten, eine Schicht Kupfer oder Nickel besitzt.
EP19820402022 1981-11-09 1982-11-03 Bimetallanordnung mit einem in Reihe geschalteten Heizelement Expired EP0080393B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8120921 1981-11-09
FR8120921A FR2516301A1 (fr) 1981-11-09 1981-11-09 Dispositif de bilame placee en serie avec une chaufferette

Publications (2)

Publication Number Publication Date
EP0080393A1 EP0080393A1 (de) 1983-06-01
EP0080393B1 true EP0080393B1 (de) 1985-04-03

Family

ID=9263814

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820402022 Expired EP0080393B1 (de) 1981-11-09 1982-11-03 Bimetallanordnung mit einem in Reihe geschalteten Heizelement

Country Status (3)

Country Link
EP (1) EP0080393B1 (de)
DE (1) DE3262898D1 (de)
FR (1) FR2516301A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5221915A (en) * 1991-05-24 1993-06-22 Matsushita Electric Industrial Co., Ltd. Thermal protector
DE4406377A1 (de) * 1994-02-26 1995-08-31 Abb Patent Gmbh Vorrichtung zur Beheizung eines Streifens aus Thermobimetall, Formgedächtnislegierung oder dergleichen
DE19610106A1 (de) * 1996-03-15 1997-09-18 Holzschuh Gmbh & Co Kg Anordnung zur Fernsteuerung eines Elektromotors, insbesondere für einen Heiz- und Gebläselüfter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE560551C (de) * 1929-06-25 1932-10-05 Felten & Guilleaume Carlswerk Bi-Metallausloeser mit Shunt
NL27671C (de) * 1929-06-28
US1854007A (en) * 1930-03-18 1932-04-12 Gen Electric Thermal relay
DE738071C (de) * 1941-10-15 1943-08-02 Siemens Ag Thermischer Ausloeser fuer elektrische Schalter
DE1053640B (de) * 1954-06-12 1959-03-26 Ellenberger & Poensgen UEberstromschutzschalter
DE1059552B (de) * 1956-08-16 1959-06-18 Stotz Kontakt Gmbh Selbstschalter fuer Wechselstrom
DE1513256B2 (de) * 1965-03-16 1971-02-11 Licentia Patent Verwaltungs GmbH, 6000 Frankfurt Bimetalleinnchtung, insbesondere Bimetallauslöser
DE2818203A1 (de) * 1978-04-26 1979-11-08 Bbc Brown Boveri & Cie Thermobimetallanordnung

Also Published As

Publication number Publication date
EP0080393A1 (de) 1983-06-01
FR2516301B1 (de) 1984-11-30
DE3262898D1 (en) 1985-05-09
FR2516301A1 (fr) 1983-05-13

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