EP1356488B1 - Adjusting device for a thermal trip element - Google Patents

Adjusting device for a thermal trip element Download PDF

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Publication number
EP1356488B1
EP1356488B1 EP02700161A EP02700161A EP1356488B1 EP 1356488 B1 EP1356488 B1 EP 1356488B1 EP 02700161 A EP02700161 A EP 02700161A EP 02700161 A EP02700161 A EP 02700161A EP 1356488 B1 EP1356488 B1 EP 1356488B1
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EP
European Patent Office
Prior art keywords
bimetallic
limb
strip
adjustment apparatus
bending point
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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
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EP02700161A
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German (de)
French (fr)
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EP1356488A1 (en
Inventor
Christoph Weber
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Siemens AG
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Siemens AG
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Publication of EP1356488A1 publication Critical patent/EP1356488A1/en
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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
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H71/7436—Adjusting the position (or prestrain) of the bimetal

Definitions

  • the invention relates to an adjusting device for a thermal release of a switching device according to the preamble of claim 1.
  • Such adjusting device is known from EP 0 913 848 A2 known.
  • Under switching device while mechanical or electromechanical switching devices, especially circuit breakers, circuit breakers, relays, contactors or the like understood.
  • Such a switching device is used to connect a circuit to a power grid and for manual and automatic disconnection of the circuit from the network when the current exceeds a predetermined value.
  • a miniature circuit breaker protects cables in installations and systems against overload and short circuits. In a network with shutdown by overcurrent protective devices prevents such a switching device in case of failure additionally the existence of high contact voltages.
  • the switching device or circuit breaker is a power storage, eg. As a spring, as part of a mechanical switching mechanism or switching mechanism clamped, which is released during the tripping operation and actuates the switch.
  • the switching device comprises a thermal release in the form of a usually strip-shaped bimetal, which triggers delay-dependent delayed overload.
  • the tripping operation is triggered by a thermal deformation of the bimetallic strip as a result of the overcurrent carried over this.
  • the bimetallic strip acts on a release lever spaced opposite its free end and mechanically coupled to the switch lock.
  • the switching device usually also includes an instantaneous triggering magnetic or electromagnetic trigger for high surge and short circuit currents.
  • the distance between the free end of the bimetal and the release lever is adjustable, what an adjusting screw is usually provided for.
  • Switchgear in which such an adjusting screw are used for bimetallic adjustment are, for example, from DE 1 904 731 A1 and from the EP 0 143 981 A1 as well as from the EP 0 412 953 A3 known.
  • the use of an adjusting screw is associated with corresponding manufacturing and manufacturing costs.
  • the invention is therefore based on the object, a particularly inexpensive and easy to handle adjusting device for a switching device, in particular for a circuit breaker specify.
  • the distance between the trigger lever and the latter as a result of thermal deformation increasingly acting in the triggering free end of the bimetal is adjustable by bending a fixedly connected to this bimetallic.
  • the bimetal has at least one predetermined bending point, preferably two or three predetermined bending points on.
  • the bimetal is effective in its fixation or storage in the housing of such a switching device as a multi-link chain or gearbox.
  • the bimetallic support In the region of a first predetermined bending point, the bimetallic support has a holding limb extending parallel to the bimetal and connected to its contact end, and a handling leg extending at least approximately transversely thereto. The free end of the handling leg may be guided in or against a housing contour, wherein this free end is guided or held pivotably by means of a corresponding actuating tool on an at least approximately circular arc-shaped bending web.
  • Another, second predetermined bending point is provided either along the retaining leg or at its side facing away from the handle leg end.
  • the bimetal in this second predetermined bending point goes over into a holding leg expediently at an obtuse angle transverse fixing legs.
  • the fixing leg itself is then expediently itself in turn twofold, so that there is a total of approximately U-shaped fixing legs and thus a total loop-shaped or loop-shaped bimetallic.
  • the handling leg extending from the first predetermined bending point is bent inwards or outwards.
  • bent handling leg of this front side is suitably guided against an arcuate Justierkontur. This is preferably realized by a corresponding housing contour of the switching device.
  • This having the shape of an arc adjustment or housing contour has a decreasing radius, in which the handling leg is located.
  • the bimetal carrier is bent and thus changes the position of the bimetal for the purpose of Bimetalljust réelle. It can be adjusted according to the requirements by appropriate design of the adjustment or housing contour, the ratio of angle of rotation of the handling leg and movement of Bimetall990des.
  • the adjusting device is in turn bent by twisting the handling leg to the pivot points formed by the two predetermined bending points of the bimetal and thus changed the position of the bimetal for the purpose of adjustment.
  • the distance of the free end of the bimetallic strip or the bimetal tip to the release lever is thus adjusted or adjusted by bending the bimetallic support.
  • the predetermined bending points are expediently formed by material recesses in the corresponding crimping crests of the bimetal carrier.
  • These Nachschwindonne which are commonly used housing materials, lead over the device life to undesirable changes important, constructive dimensional assignments, in particular the distance between the bimetal and trip lever, and thus to an undesirable misalignment or adjustment of the thermal release.
  • FIGS 1 and 3 show a detail of a switching device 1 with the housing cover lifted off the housing 2, in which the essential parts of an adjustable thermal release are shown visibly.
  • the thermal release comprises a bimetallic strip 3, whose contact end 3a is integrally connected to a bimetallic support 4 and thus held stationary.
  • the bimetal 4 is electrically connected to a terminal 5 for power management via the switching device 1.
  • the free end 3b of the bimetal 3, d. H. the bimetal, is a trigger lever 6 spaced opposite, which is coupled to a non-illustrated rear derailleur or switch lock in a conventional manner.
  • This distance A between the bimetallic tip 3b and the release lever 6 is adjustable by bending the bimetal 4.
  • the bimetal 4 is repeatedly bent or bent in the manner of a three-link chain.
  • the contact end 3a of the bimetal 3 is firmly bonded.
  • the holding leg 4b is in this embodiment at a second predetermined bending point 8 in a Fixierschenkel 4c, which is itself bent approximately U-shaped.
  • the bimetallic support 4 is fixed in position in the housing 2 by means of corresponding housing structures or contours 9, 10.
  • the outwardly directed handling leg 4a of the bimetallic support 4 is guided frontally against an arcuate housing contour and is supported there.
  • This housing contour forms the arcuate Justierkontur 12 for Bimetalljust réelle.
  • the radius R of this circular or arcuate Justierbahn B predetermining Justierkontur 12 decreases in a clockwise direction to a reduced radius R 'down.
  • the second predetermined bending point 8 is provided approximately in the middle region of the retaining limb 4b of the bimetallic support 4. Up to this predetermined bending point 8 is then the bimetal 4 with its fixing legs 4c between the correspondingly executed housing structures or contours force-locking clamped. Thus, only one leg portion of the retaining leg 4b and in its extension over the first predetermined bending point 7 of the handling leg 4'a in the direction of the double arrow 11 are bendable.
  • the fixing leg 4c of the bimetallic support 4, which adjoins the retaining limb 4b in this embodiment via a bend 8 ', is in turn bent at least approximately in a U-shape.
  • the handling leg 4'a is bent inwards and thereby even bent to form a third predetermined bending point 13, so that the bimetallic support 4 is effective in the manner of a four-bar chain.
  • the first and second predetermined bending point 7 and 8 are formed in both embodiments according to Figures 2 and 4 by drilling or punching in the sheet material of the bimetal 4.
  • the third predetermined bending point 13 is also made by a corresponding material recess.
  • Freiendlor is on the handling leg 4'a a rotary or positioning pin 14 formed, which is formed by a material recess in the sheet metal flap-like handling leg 4'a.
  • This pivot pin 14 of the handling leg 4'a engages in a housing effective as a rotational contour housing or rotary opening 15 which is provided in a suitably positioned housing contour in the form of expediently a dome-shaped housing structure 16.
  • free end 4 "a of the handling leg 4 ⁇ a attacks the actuating tool for bimetallic adjustment.
  • the bimetallic support 4 is in turn bent by turning the handling leg 4 ' a in the direction of the double arrow B shown, and the position of the bimetal 3 is changed to set the distance A.
  • the bimetallic tip or the free end 3b of the bimetal 3 is rotated in the triggering direction D, thereby performing the bimetallic adjustment.
  • the rotary joint formed by the pivot pin 14 and the rotary opening 15 again predetermines the circular or circular-shaped adjusting track B symbolized by the double arrow.
  • the adjusting device is essentially formed by the bimetallic support 4 with the bimetal 3 held thereon and the rotary opening 15 in the housing attachment 16 which acts as an adjustment contour.
  • the bimetal adjustment serving and provided by the along the bimetallic support 4 provided predetermined bending points 7 and 8 or 7,8 and 13 in the manner of a multi-link chain effective mechanism advantageously also a practically unavoidable GeHousachachschwindung.
  • This Nachschwindung also causes an approximation of effective as Justierkontur housing contour 12 and the Gescouseaufficientes 16 - and thus effective as Justierkontur rotational opening 15 - in the direction
  • the distance or the dimension A increases due to a housing shrinkage.
  • the contour 12 moves toward the contour 9 and the bimetallic strip 3 or its tip 3b is tracked in the clockwise direction.
  • the distance or the dimension A decreases as a result of a housing shrinkage, with the contour 16 moving towards the fastening contour 9. This reduces the distance between the two predetermined bending points 8 and 13, with the result that the predetermined bending point 7 is pressed against the release direction D and the bimetal 3 is moved counterclockwise.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Vending Machines For Individual Products (AREA)
  • Finger-Pressure Massage (AREA)

Abstract

An adjusting device is for a thermal trip element of a switchgear. It includes a bimetallic element that is stationarily fixed on a bimetallic support. The free end of the bimetallic element is spaced apart form a trip lever and increasingly impinges the same in the direction of release was a result of the thermal deformation, the distance being adjustable by bending the bimetallic support. The adjusting device is especially suitable for circuit breakers or the like.

Description

Die Erfindung bezieht sich auf eine Justiervorrichtung für einen thermischen Auslöser eines Schaltgerätes gemäß dem Oberbegriff des Anspruchs 1. Eine derartige Justiervorrichtung ist aus der EP 0 913 848 A2 bekannt. Unter Schaltgerät werden dabei mechanische oder elektromechanische Schaltgeräte, insbesondere Leitungsschutzschalter, Leistungsschalter, Relais, Schütze oder dergleichen verstanden.The invention relates to an adjusting device for a thermal release of a switching device according to the preamble of claim 1. Such adjusting device is known from EP 0 913 848 A2 known. Under switching device while mechanical or electromechanical switching devices, especially circuit breakers, circuit breakers, relays, contactors or the like understood.

Ein derartiges Schaltgerät dient zum Verbinden eines Stromkreises mit einem Stromnetz sowie zur manuellen und selbsttätigen Trennung des Stromkreises vom Netz, wenn der Strom einen vorbestimmten Wert überschreitet. So dient beispielsweise ein Leitungsschutzschalter zum Schutz von Leitungen in Installationen und Anlagen gegen Überlast und Kurzschluss. In einem Netz mit Abschaltung durch überstrom-Schutzorgane verhindert ein solches Schaltgerät im Fehlerfall zusätzlich das Bestehenbleiben zu hoher Berührungsspannungen.Such a switching device is used to connect a circuit to a power grid and for manual and automatic disconnection of the circuit from the network when the current exceeds a predetermined value. For example, a miniature circuit breaker protects cables in installations and systems against overload and short circuits. In a network with shutdown by overcurrent protective devices prevents such a switching device in case of failure additionally the existence of high contact voltages.

Beim Einschalten des Schaltgerätes oder Schutzschalters wird ein Kraftspeicher, z. B. eine Feder, als Teil eines mechanischen Schaltwerkes oder Schaltschlosses gespannt, die beim Auslösevorgang freigegeben wird und den Schalter betätigt. Dabei umfasst das Schaltgerät einen thermischen Auslöser in Form eines üblicherweise streifenförmigen Bimetalls, der überlastzeitabhängig verzögert auslöst. Der Auslösevorgang wird durch eine thermische Verformung des Bimetallstreifens infolge des über diesen geführten Überstroms ausgelöst. Dazu beaufschlagt der Bimetallstreifen einen dessen Freiende beabstandet gegenüberliegenden und mit dem Schaltschloss mechanisch gekoppelten Auslösehebel. Somit entklinkt über diesen der Bimetallstreifen das Schaltschloss, während der Kraftspeicher des Schaltschlosses einen beweglichen Kontakt oder Bewegkontakt öffnet, indem dieser von einem Festkontakt ab-Ohebt. Zudem umfasst das Schaltgerät üblicherweise zusätzlich einen unverzögert auslösenden magnetischen oder elektromagnetischen Auslöser für hohe Stoß- und Kurzschlussströme.When switching the switching device or circuit breaker is a power storage, eg. As a spring, as part of a mechanical switching mechanism or switching mechanism clamped, which is released during the tripping operation and actuates the switch. In this case, the switching device comprises a thermal release in the form of a usually strip-shaped bimetal, which triggers delay-dependent delayed overload. The tripping operation is triggered by a thermal deformation of the bimetallic strip as a result of the overcurrent carried over this. For this purpose, the bimetallic strip acts on a release lever spaced opposite its free end and mechanically coupled to the switch lock. Thus unlatched about this the bimetallic strip switching mechanism, while the energy storage of the switching mechanism opens a movable contact or moving contact by this from a fixed contact-off. In addition, the switching device usually also includes an instantaneous triggering magnetic or electromagnetic trigger for high surge and short circuit currents.

Der Abstand zwischen dem Freiende des Bimetalls und dem Auslösehebel ist einstellbar zu gestalten, wozu üblicherweise eine Justierschraube vorgesehen ist. Schaltgeräte, bei denen eine solche Justierschraube zur Bimetalljustierung eingesetzt sind, sind beispielsweise aus der DE 1 904 731 A1 und aus der EP 0 143 981 A1 sowie aus der EP 0 412 953 A3 bekannt. Der Einsatz einer Justierschraube ist allerdings mit entsprechenden Herstellungs- und Fertigungskosten verbunden.The distance between the free end of the bimetal and the release lever is adjustable, what an adjusting screw is usually provided for. Switchgear, in which such an adjusting screw are used for bimetallic adjustment are, for example, from DE 1 904 731 A1 and from the EP 0 143 981 A1 as well as from the EP 0 412 953 A3 known. However, the use of an adjusting screw is associated with corresponding manufacturing and manufacturing costs.

Aus der EP 0 913 848 A2 sind zudem ein Verfahren zur thermischen Kalibrierung des Auslösemechanismus eines Schaltgerätes und ein entsprechender Auslösemechanismus bekannt, bei dem die Justierung thermisch mittels eines Lasers erfolgt.From the EP 0 913 848 A2 In addition, a method for thermal calibration of the triggering mechanism of a switching device and a corresponding triggering mechanism are known in which the adjustment takes place thermally by means of a laser.

Der Erfindung liegt daher die Aufgabe zugrunde, eine besonders kostengünstige und einfach handhabbare Justiervorrichtung für ein Schaltgerät, insbesondere für einen Leitungsschutzschalter, anzugeben.The invention is therefore based on the object, a particularly inexpensive and easy to handle adjusting device for a switching device, in particular for a circuit breaker specify.

Diese Aufgabe wird erfindungsgemäß gelöst durch die Merkmale des Anspruchs 1. Dazu ist der Abstand zwischen dem Auslösehebel und dem diesen infolge thermischer Verformung zunehmend in Auslöserichtung beaufschlagenden Freiende des Bimetalls durch Verbiegen eines mit diesem fest verbundenen Bimetallträgers einstellbar.This object is achieved by the features of claim 1. For this purpose, the distance between the trigger lever and the latter as a result of thermal deformation increasingly acting in the triggering free end of the bimetal is adjustable by bending a fixedly connected to this bimetallic.

Dabei weist der Bimetallträger mindestens eine Sollbiegestelle, vorzugsweise zwei oder drei Sollbiegestellen, auf. Dadurch ist der Bimetallträger bei dessen Fixierung oder Lagerung im Gehäuse eines derartigen Schaltgerätes als Mehrgelenkkette oder -getriebe wirksam. Im Bereich einer ersten Sollbiegestelle weist der Bimetallträger einen parallel zum Bimetall verlaufenden und mit dessen Kontaktende verbundenen Halteschenkel sowie einen zumindest annähernd quer hierzu verlaufenden Handhabungsschenkel auf. Das Freiende des Handhabungsschenkels kann in einer oder gegen eine Gehäusekontur geführt sein, wobei dieses Freiende mittels eines entsprechenden Betätigungswerkzeugs auf einer zumindest annähernd kreisbogenförmigen Biegebahn verschwenkbar geführt bzw. gehalten ist.In this case, the bimetal has at least one predetermined bending point, preferably two or three predetermined bending points on. As a result, the bimetal is effective in its fixation or storage in the housing of such a switching device as a multi-link chain or gearbox. In the region of a first predetermined bending point, the bimetallic support has a holding limb extending parallel to the bimetal and connected to its contact end, and a handling leg extending at least approximately transversely thereto. The free end of the handling leg may be guided in or against a housing contour, wherein this free end is guided or held pivotably by means of a corresponding actuating tool on an at least approximately circular arc-shaped bending web.

Eine weitere, zweite Sollbiegestelle ist entweder entlang des Halteschenkels oder an dessen dem Handhabungsschenkel abgewandten Schenkelende vorgesehen. Bei dieser Ausführungsform geht der Bimetallträger in dieser zweiten Sollbiegestelle in einen zum Halteschenkel zweckmäßigerweise unter einem stumpfen Winkel quer verlaufenden Fixierschenkel über. Der Fixierschenkel selbst ist dann zweckmäßigerweise selbst wiederum zweifach abgekröpft, so dass sich ein insgesamt etwa U-förmiger Fixierschenkel und damit ein insgesamt ösen- oder schlaufenförmig gebogener Bimetallträger ergibt.Another, second predetermined bending point is provided either along the retaining leg or at its side facing away from the handle leg end. In this embodiment, the bimetal in this second predetermined bending point goes over into a holding leg expediently at an obtuse angle transverse fixing legs. The fixing leg itself is then expediently itself in turn twofold, so that there is a total of approximately U-shaped fixing legs and thus a total loop-shaped or loop-shaped bimetallic.

Bei dieser etwa ösen- bzw. schlaufenförmigen Ausbildung des Bimetallträgers ist der sich von der ersten Sollbiegestelle aus erstreckende Handhabungsschenkel nach innen oder nach außen abgebogen. Bei ausgebogenem Handhabungsschenkel ist dieser stirnseitig zweckmäßigerweise gegen eine bogenförmige Justierkontur geführt. Diese ist vorzugsweise durch eine entsprechende Gehäusekontur des Schaltgerätes realisiert.In this approximately looped or loop-shaped design of the bimetallic strip, the handling leg extending from the first predetermined bending point is bent inwards or outwards. When bent handling leg of this front side is suitably guided against an arcuate Justierkontur. This is preferably realized by a corresponding housing contour of the switching device.

Diese die Form eines Bogens aufweisende Justier- oder Gehäusekontur weist einen sich verkleinernden Radius auf, in dem der Handhabungsschenkel liegt. Beim Verdrehen des Handhabungsschenkels um die einen Drehpunkt bildende erste Sollbiegestelle gegen die Justierkontur wird der Bimetallträger verbogen und damit die Lage des Bimetalls zum Zwecke der Bimetalljustierung verändert. Dabei kann durch entsprechende Gestaltung der Justier- bzw. Gehäusekontur das Übersetzungsverhältnis von Drehwinkel des Handhabungsschenkels und Bewegung des Bimetallfreiendes den Erfordernissen entsprechend eingestellt werden.This having the shape of an arc adjustment or housing contour has a decreasing radius, in which the handling leg is located. When the handling leg is rotated about the first predetermined bending point forming a fulcrum against the adjusting contour, the bimetal carrier is bent and thus changes the position of the bimetal for the purpose of Bimetalljustierung. It can be adjusted according to the requirements by appropriate design of the adjustment or housing contour, the ratio of angle of rotation of the handling leg and movement of Bimetallfreiendes.

Bei nach innen eingebogenem Handhabungsschenkel ist entlang dieses zweckmäßigerweise eine weitere (dritte) Sollbiegestelle vorgesehen. Zwischen dieser (dritten) Sollbiegestelle und dem Freiende des Handhabungsschenkels ist dann ein quer zur Schenkellängsrichtung verlaufender und in einer ortsfesten Positionieröffnung im Gehäuse des Schaltgerätes lagefixierbarer Positionierzapfen an den Handhabungsschenkel angeformt.When bent inward handling leg along this expediently another (third) predetermined bending point is provided. Between this (third) predetermined bending point and the free end of the handling leg then a transversely extending to the longitudinal direction of the leg and in a fixed positioning in the housing of the switching device position fixable positioning pin is formed on the handling leg.

Auch bei dieser Ausführungsform des Bimetallträgers und damit der Justiervorrichtung wird durch Verdrehen, des Handhabungsschenkels um die durch die beiden Sollbiegestellen gebildeten Drehpunkte wiederum der Bimetallträger verbogen und damit die Lage des Bimetalls zum Zwecke dessen Justierung verändert. Bei beiden Ausführungsformen wird somit durch Verbiegen des Bimetallträgers der Abstand des Freiendes des Bimetalls oder der Bimetallspitze zum Auslösehebel eingestellt bzw. justiert. Die Sollbiegestellen sind zweckmäßigerweise durch Materialaussparungen in den entsprechenden Kröpfungsscheiteln des Bimetallträgers gebildet.Also in this embodiment of the bimetal and thus the adjusting device is in turn bent by twisting the handling leg to the pivot points formed by the two predetermined bending points of the bimetal and thus changed the position of the bimetal for the purpose of adjustment. In both embodiments, the distance of the free end of the bimetallic strip or the bimetal tip to the release lever is thus adjusted or adjusted by bending the bimetallic support. The predetermined bending points are expediently formed by material recesses in the corresponding crimping crests of the bimetal carrier.

Die mit der Erfindung erzielten Vorteile bestehen insbesondere darin, dass durch geeignete Ausgestaltung und Anordnung eines das Bimetall tragenden Bimetallträgers dieser gezielt verbogen werden kann und damit eine einfache und kostengünstige Justiervorrichtung für einen thermischen Auslöser eines Schaltgerätes bereitgestellt ist.The advantages achieved by the invention are, in particular, that by suitable design and arrangement of a bimetallic support carrying the bimetal this can be specifically bent and thus a simple and cost-effective Adjustment device is provided for a thermal release of a switching device.

Dieser zur Bimetalljustierung dienende Mechanismus, bei dem der zweckmäßigerweise mit Sollbiegestellen versehene Bimetallträger nach Art einer Mehrgelenkkette, insbesondere einer Drei- oder Viergelenkkette, wirksam ist, ermöglicht zudem eine praktisch automatische oder selbsttätige Kompensation von Gehäusenachschwindungen. Diese Nachschwindungen, denen üblicherweise eingesetzte Gehäusewerkstoffe unterliegen, führen über die Gerätelebensdauer zu unerwünschten Veränderungen wichtiger, konstruktiver maßlicher Zuordnungen, wie insbesondere dem Abstand zwischen Bimetallspitze und Auslösehebel, und damit zu einer unerwünschten Dejustierung oder Verstellung auch der thermischen Auslösung.This serving for bimetal adjustment mechanism in which the suitably provided with predetermined bending bimetallic in the manner of a multi-link chain, in particular a three- or four-link chain, is effective, also allows a virtually automatic or automatic compensation of housing Nachschwindungen. These Nachschwindungen, which are commonly used housing materials, lead over the device life to undesirable changes important, constructive dimensional assignments, in particular the distance between the bimetal and trip lever, and thus to an undesirable misalignment or adjustment of the thermal release.

Nachfolgend werden Ausführungsbeispiele der Erfindung anhand einer Zeichnung näher erläutert. Darin zeigen:

  • FIG 1 in perspektivischer Darstellung eine in ein Schaltgerät endmontierte thermische Auslösevorrichtung mit einer ersten Ausführungsform einer erfindungsgemäßen Justiervorrichtung mit einem zwei Sollbiegestellen aufweisenden Bimetallträger,
  • FIG 2 den mit einem Bimetallstreifen verbundenen Bimetallträger aus FIG 1,
  • FIG 3 in einer Darstellung gemäß FIG 1 eine zweite Ausführungsform der erfindungsgemäßen Justiervorrichtung mit einem drei Sollbiegestellen aufweisenden Bimetallträger, und
  • FIG 4 in einer Darstellung gemäß FIG 2 den Bimetallträger aus FIG 3.
Embodiments of the invention will be explained in more detail with reference to a drawing. Show:
  • 1 shows a perspective view of a final device in a switching device thermal tripping device with a first embodiment of an adjusting device according to the invention with a two predetermined bending points having bimetal,
  • 2 shows the bimetal carrier of FIG. 1 connected to a bimetal strip,
  • 3 shows a representation according to FIG. 1 of a second embodiment of the adjusting device according to the invention with a bimetal carrier having three predetermined bending points, and FIG
  • 4 in a representation according to FIG. 2 the bimetal carrier from FIG. 3.

Einander entsprechende Teile sind in allen Figuren mit den gleichen Bezugszeichen versehen.Corresponding parts are provided in all figures with the same reference numerals.

Die Figuren 1 und 3 zeigen ausschnittsweise ein Schaltgerät 1 bei abgehobenem Gehäusedeckel dessen Gehäuses 2, in dem die wesentlichen Teile eines justierbaren thermischen Auslösers sichtbar dargestellt sind. Der thermische Auslöser umfasst einen Bimetallstreifen 3, dessen Kontaktende 3a mit einem Bimetallträger 4 stoffschlüssig verbunden und somit ortsfest gehalten ist. Der Bimetallträger 4 ist mit einer Anschlussklemme 5 zur Stromführung über das Schaltgerät 1 elektrisch leitend verbunden.Figures 1 and 3 show a detail of a switching device 1 with the housing cover lifted off the housing 2, in which the essential parts of an adjustable thermal release are shown visibly. The thermal release comprises a bimetallic strip 3, whose contact end 3a is integrally connected to a bimetallic support 4 and thus held stationary. The bimetal 4 is electrically connected to a terminal 5 for power management via the switching device 1.

Das Freiende 3b des Bimetalls 3, d. h. die Bimetallspitze, steht einem Auslösehebel 6 beabstandet gegenüber, der mit einem nicht näher dargestellten Schaltwerk oder Schaltschloss in an sich bekannter Art und Weise gekoppelt ist. Dieser Abstand A zwischen der Bimetallspitze 3b und dem Auslösehebel 6 ist durch Verbiegen des Bimetallträgers 4 einstellbar.The free end 3b of the bimetal 3, d. H. the bimetal, is a trigger lever 6 spaced opposite, which is coupled to a non-illustrated rear derailleur or switch lock in a conventional manner. This distance A between the bimetallic tip 3b and the release lever 6 is adjustable by bending the bimetal 4.

Bei der Ausführungsform des justierbaren thermischen Auslösers und damit der Justiervorrichtung gemäß den Figuren 1 und 2 ist der Bimetallträger 4 nach Art einer Dreigelenkkette mehrfach abgekröpft oder abgebogen. Dabei sind an einer ersten Sollbiegestelle 7 ein Handhabungsschenkel 4a und ein hierzu quer, d.h. zumindest annähernd rechtwinklig verlaufender Halteschenkel 4b des Bimetallträgers 4 gebildet. Mit diesem Halteschenkel 4b ist das Kontaktende 3a des Bimetalls 3 stoffschlüssig verbunden.In the embodiment of the adjustable thermal release and thus the adjusting device according to Figures 1 and 2, the bimetal 4 is repeatedly bent or bent in the manner of a three-link chain. In this case, at a first predetermined bending point 7, a handling leg 4a and a transverse thereto, i. formed at least approximately perpendicular extending leg 4b of the bimetal 4. With this holding leg 4b, the contact end 3a of the bimetal 3 is firmly bonded.

Der Halteschenkel 4b geht bei dieser Ausführungsform an einer zweiten Sollbiegestelle 8 in einen Fixierschenkel 4c über, der selbst etwa U-förmig gebogen ist. Mit diesem Fixierschenkel 4c wird der Bimetallträger 4 im Gehäuse 2 durch entsprechende Gehäuseaufbauten oder -konturen 9,10 lagefixiert. Dabei ist der Halteschenkel 4b sowohl um die (zweite) Sollbiegestelle 8 als auch um die (erste) Sollbiegestelle 7 in Richtung des Doppelpfeils 11 verbiegbar und liegt somit über dessen gesamter Schenkellänge anlagefrei im Gehäuse 2 ein.The holding leg 4b is in this embodiment at a second predetermined bending point 8 in a Fixierschenkel 4c, which is itself bent approximately U-shaped. With this fixing leg 4c, the bimetallic support 4 is fixed in position in the housing 2 by means of corresponding housing structures or contours 9, 10. there is the holding leg 4b both to the (second) predetermined bending point 8 and to the (first) predetermined bending point 7 in the direction of the double arrow 11 bendable and thus lies over the entire length of the leg without installation in the housing 2 a.

Der nach außen gerichtete Handhabungsschenkel 4a des Bimetallträgers 4 ist stirnseitig gegen eine bogenförmige Gehäusekontur geführt und stützt sich dort ab. Diese Gehäusekontur bildet die bogenförmige Justierkontur 12 zur Bimetalljustierung. Der Radius R dieser eine kreisförmige oder kreisbogenförmige Justierbahn B vorgebenden Justierkontur 12 nimmt im Uhrzeigersinn zu einem verkleinerten Radius R' hin ab.The outwardly directed handling leg 4a of the bimetallic support 4 is guided frontally against an arcuate housing contour and is supported there. This housing contour forms the arcuate Justierkontur 12 for Bimetalljustierung. The radius R of this circular or arcuate Justierbahn B predetermining Justierkontur 12 decreases in a clockwise direction to a reduced radius R 'down.

Zur Bimetalljustierung und damit zur Einstellung des Abstands A zwischen dem Freiende 3b des Bimetalls 3 und dem Auslösehebel 6 wird mittels eines (nicht dargestellten) Handhabungswerkzeugs der Handhabungsschenkel 4a des Bimetallträgers 4 um den durch die erste Sollbiegestelle 7 gebildeten Drehpunkt gegen die Justierkontur 12 verdreht und damit der Bimetallträger 4 verbogen, so dass sich die Lage des Bimetalls 3 zur Einstellung des Abstands A entsprechend verändert. So wird bei einer Drehung des Handhabungsschenkels 4a im Uhrzeigersinn, d. h. in der dargestellten Pfeilrichtung der Justierbahn B das Bimetall 3 und damit dessen Freiende oder Bimetallspitze 3b in Auslöserichtung D gedreht. Die Justiervorrichtung ist bei dieser Ausführungsform im Wesentlichen durch den Bimetallträger 4 mit dem daran gehaltenen Bimetall 3 und die Justierkontur 12 gebildet.For bimetallic adjustment and thus for adjusting the distance A between the free end 3b of the bimetal 3 and the release lever 6 by means of a (not shown) handling tool of the handling leg 4a of the bimetal 4 is rotated about the first predetermined bending point 7 pivot point against the Justierkontur 12 and thus the bimetal 4 bent, so that the position of the bimetal 3 to adjust the distance A changed accordingly. Thus, upon rotation of the handling leg 4a clockwise, i. H. in the illustrated arrow direction of the Justierbahn B, the bimetal 3 and thus the free end or bimetal 3b in the release direction D rotated. The adjusting device is formed in this embodiment substantially by the bimetal 4 with the bimetal 3 held thereon and the Justierkontur 12.

Bei der Ausführungsform des Bimetallträgers 4 gemäß den Figuren 3 und 4 ist die zweite Sollbiegestelle 8 etwa im mittleren Bereich des Halteschenkels 4b des Bimetallträgers 4 vorgesehen. Bis zu dieser Sollbiegestelle 8 ist dann der Bimetallträger 4 mit dessen Fixierschenkel 4c zwischen den entsprechend ausgeführten Gehäuseaufbauten bzw. -konturen kraftschlüssig klemmfixiert. Somit sind lediglich ein Schenkelabschnitt des Halteschenkels 4b und in dessen Verlängerung über die erste Sollbiegestelle 7 der Handhabungsschenkel 4'a in Richtung des Doppelpfeils 11 verbiegbar. Der sich bei dieser Ausführungsform über eine Abkröpfung 8' an den Halteschenkel 4b anschließende Fixierschenkel 4c des Bimetallträgers 4 ist wiederum zumindest annähernd U-förmig gebogen.In the embodiment of the bimetallic support 4 according to FIGS. 3 and 4, the second predetermined bending point 8 is provided approximately in the middle region of the retaining limb 4b of the bimetallic support 4. Up to this predetermined bending point 8 is then the bimetal 4 with its fixing legs 4c between the correspondingly executed housing structures or contours force-locking clamped. Thus, only one leg portion of the retaining leg 4b and in its extension over the first predetermined bending point 7 of the handling leg 4'a in the direction of the double arrow 11 are bendable. The fixing leg 4c of the bimetallic support 4, which adjoins the retaining limb 4b in this embodiment via a bend 8 ', is in turn bent at least approximately in a U-shape.

Bei dieser Ausführungsform ist der Handhabungsschenkel 4`a nach innen abgebogen und dabei selbst unter Bildung einer dritten Sollbiegestelle 13 abgekröpft, so dass der Bimetallträger 4 nach Art einer Viergelenkkette wirksam ist. Die erste und zweite Sollbiegestelle 7 bzw. 8 sind bei beiden Ausführungsformen nach den Figuren 2 und 4 durch Bohrungen oder Stanzungen im Blechmaterial des Bimetallträgers 4 gebildet. Zweckmäßigerweise ist bei der Ausführungsfo,rm nach den Figuren 3 und 4 zusätzlich auch die dritte Sollbiegestelle 13 durch eine entsprechende Materialaussparung hergestellt.In this embodiment, the handling leg 4'a is bent inwards and thereby even bent to form a third predetermined bending point 13, so that the bimetallic support 4 is effective in the manner of a four-bar chain. The first and second predetermined bending point 7 and 8 are formed in both embodiments according to Figures 2 and 4 by drilling or punching in the sheet material of the bimetal 4. Conveniently, in the Ausführungsfo, rm according to Figures 3 and 4 in addition, the third predetermined bending point 13 is also made by a corresponding material recess.

Freiendseitig ist an den Handhabungsschenkel 4'a ein Dreh- oder Positionierzapfen 14 angeformt, der durch eine Materialaussparung im blechlappenartigen Handhabungsschenkel 4'a gebildet ist. Mit diesem Drehzapfen 14 greift der Handhabungsschenkel 4'a in eine als Drehkontur wirksame Gehäuseaufnahme oder Drehöffnung 15 ein, die in einer entsprechend positionierten Gehäusekontur in Form zweckmäßigerweise eines domförmigen Gehäuseaufbaus 16 vorgesehen ist. An dem im Bereich des Drehzapfens 14 liegenden Freiende 4"a des Handhabungsschenkels 4`a greift das Betätigungswerkzeug zur Bimetalljustierung an.Freiendseitig is on the handling leg 4'a a rotary or positioning pin 14 formed, which is formed by a material recess in the sheet metal flap-like handling leg 4'a. With this pivot pin 14 of the handling leg 4'a engages in a housing effective as a rotational contour housing or rotary opening 15 which is provided in a suitably positioned housing contour in the form of expediently a dome-shaped housing structure 16. At the lying in the region of the pivot pin 14 free end 4 "a of the handling leg 4`a attacks the actuating tool for bimetallic adjustment.

Auch bei dieser Ausführungsform wird durch Verdrehen des Handhabungsschenkels 4'a in Richtung des dargestellten Doppelpfeils B der Bimetallträger 4 wiederum verbogen und die Lage des Bimetalls 3 zur Einstellung des Abstands A verändert. Auch hier wird bei einer Drehung des Handhabungsschenkels 4a im Uhrzeigersinn der dargestellten Pfeilrichtung der Justierbahn B die Bimetallspitze bzw. das Freiende 3b des Bimetalls 3 in Auslöserichtung D gedreht und dadurch die Bimetalljustierung durchgeführt. Dabei gibt das durch den Drehzapfen 14 und die Drehöffnung 15 gebildete Drehgelenk wiederum die durch den Doppelpfeil symbolisierte kreisförmige bzw. kreisbogenförmige Justierbahn B vor. Hier ist die Justiervorrichtung im Wesentlichen durch den Bimetallträger 4 mit dem daran gehaltenen Bimetall 3 und die als Justierkontur wirksame Drehöffnung 15 im Gehäuseaufsatz 16 gebildet.In this embodiment too, the bimetallic support 4 is in turn bent by turning the handling leg 4 ' a in the direction of the double arrow B shown, and the position of the bimetal 3 is changed to set the distance A. Again, upon rotation of the handling leg 4a in a clockwise direction of the illustrated arrow direction of Justierbahn B, the bimetallic tip or the free end 3b of the bimetal 3 is rotated in the triggering direction D, thereby performing the bimetallic adjustment. In this case, the rotary joint formed by the pivot pin 14 and the rotary opening 15 again predetermines the circular or circular-shaped adjusting track B symbolized by the double arrow. Here, the adjusting device is essentially formed by the bimetallic support 4 with the bimetal 3 held thereon and the rotary opening 15 in the housing attachment 16 which acts as an adjustment contour.

Bei beiden Ausführungsformen kompensiert der zur Bimetalljustierung dienende und durch die entlang des Bimetallträgers 4 vorgesehenen Sollbiegestellen 7 und 8 bzw. 7,8 und 13 nach Art einer Mehrgelenkkette wirksame Mechanismus vorteilhafterweise auch eine praktisch unvermeidliche Gehäusenachschwindung. Ändert sich nämlich auf Grund einer solchen Gehäuseschwindung die Position des Auslösehebels 6 in Richtung größer werdenden Abstands A, so bewirkt diese Nachschwindung auch eine Annäherung der als Justierkontur wirksamen Gehäusekontur 12 bzw. des Gehäuseaufsatzes 16 - und damit der als Justierkontur wirksamen Drehöffnung 15 - in Richtung des Bimetalls 3. Dies wiederum bewirkt ein selbsttätiges Verbiegen des Bimetallträgers 4 und damit ein Nachführen des Bimetalls 3 in Richtung des sich entfernenden Auslösehebels 6, so dass der Abstand A praktisch konstant bleibt.In both embodiments, the bimetal adjustment serving and provided by the along the bimetallic support 4 provided predetermined bending points 7 and 8 or 7,8 and 13 in the manner of a multi-link chain effective mechanism advantageously also a practically unavoidable Gehäusachachschwindung. Changes the position of the release lever 6 in the direction of increasing distance A due to such a housing shrinkage, so this Nachschwindung also causes an approximation of effective as Justierkontur housing contour 12 and the Gehäuseaufsatzes 16 - and thus effective as Justierkontur rotational opening 15 - in the direction This in turn causes an automatic bending of the bimetallic support 4 and thus a tracking of the bimetal 3 in the direction of the withdrawing release lever 6, so that the distance A remains practically constant.

So wird bei der Ausführungsform nach FIG 1 aufgrund einer Gehäuseschwindung der Abstand oder das Maß A größer. Gleichzeitig bewegt sich die Kontur 12 auf die Kontur 9 zu und der Bimetallstreifen 3 bzw. dessen Spitze 3b wird im Uhrzeigersinn nachgeführt.Thus, in the embodiment according to FIG. 1, the distance or the dimension A increases due to a housing shrinkage. At the same time, the contour 12 moves toward the contour 9 and the bimetallic strip 3 or its tip 3b is tracked in the clockwise direction.

Demgegenüber wird bei der Ausführungsform nach FIG 3 der Abstand bzw. das Maß A infolge einer Gehäuseschwindung kleiner, wobei sich die Kontur 16 auf die Befestigungskontur 9 zubewegt. Dadurch verringert sich der Abstand zwischen den beiden Sollbiegestellen 8 und 13 mit der Folge, dass die Sollbiegestelle 7 entgegen der Auslöserichtung D gedrückt und das Bimetall 3 gegen den Uhrzeigersinn bewegt wird.In contrast, in the embodiment according to FIG. 3, the distance or the dimension A decreases as a result of a housing shrinkage, with the contour 16 moving towards the fastening contour 9. This reduces the distance between the two predetermined bending points 8 and 13, with the result that the predetermined bending point 7 is pressed against the release direction D and the bimetal 3 is moved counterclockwise.

Claims (9)

  1. Adjustment apparatus for a thermal release for a switching device (1), having a bimetallic-strip (3) which is held in a fixed position on a bimetallic-strip mount (4) and whose free end (3b) is at a distance from a tripping lever (6) and acts on this increasingly in the tripping direction (D) as a result of thermal deformation, with the distance (A) being adjustable by bending of the bimetallic-strip mount (4), with the bimetallic-strip mount (4) having a holding limb (4b) which runs parallel to the bimetallic-strip (3) and is connected to its contact end (3a) as well as a handling limb (4a), which runs approximately transversely with respect thereto, in the area of a (first) nominal bending point (7), characterized in that the free end of the handling limb (4a) is guided in or against a housing contour (12 or 15, 16) and can be pivoted on an at least approximately circular adjustment path (B).
  2. Adjustment apparatus according to Claim 1, characterized in that the bimetallic-strip mount (4) has a second nominal bending point (8), which is at a distance from the first nominal bending point (7), along its holding limb (4b).
  3. Adjustment apparatus according to Claim 1 or 2, characterized in that the bimetallic-strip mount (4) has an at least approximately U-shaped fixing limb (4c) which is connected to the holding limb (4b) via a bend (8,8').
  4. Adjustment apparatus according to one of Claims 1 to 3, characterized in that the handling limb (4a) of the bimetallic-strip mount (4) is guided at the end against a curved adjustment contour (12).
  5. Adjustment apparatus according to Claim 4, characterized in that the adjustment contour (12) has an adjustment path (B) which is at least approximately in the form of a circular arc and has a decreasing radius (R,R').
  6. Adjustment apparatus according to one of Claims 1 to 3, characterized in that the handling limb (4'a) of the bimetallic-strip mount (4) has a Journal (14) which runs transversely with respect to the limb at longitudinal direction and can be fixed in position in a stationary rotation opening (15) between which Journal (14) and the first nominal bending point (7) a further (third) nominal bending point (13) is provided.
  7. Adjustment apparatus according to one of Claims 1 to 6, characterized in that the or each nominal bending point (7, 8, 13) is formed by a material cutout in the respective bend peak of the bimetallic-strip mount (4).
  8. Switching device, in particular a circuit breaker, having an adjustment apparatus (4, 12 or 15) according to one of Claims 1 to 7.
  9. Switching device, according to Claim 8, in which the adjustment apparatus (4, 12 or 15) compensates for housing contracting in such a manner that, in the event of a change in the distance (A) between the tripping lever (6) and the free end (3b) of the bimetallic-strip (3), the latter is automatically moved in the appropriate manner in the clockwise or anti-clockwise direction.
EP02700161A 2001-01-31 2002-01-18 Adjusting device for a thermal trip element Expired - Lifetime EP1356488B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10104272 2001-01-31
DE10104272 2001-01-31
PCT/DE2002/000155 WO2002061785A1 (en) 2001-01-31 2002-01-18 Adjusting device for a thermal trip element

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EP1356488A1 EP1356488A1 (en) 2003-10-29
EP1356488B1 true EP1356488B1 (en) 2007-08-01

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EP02700161A Expired - Lifetime EP1356488B1 (en) 2001-01-31 2002-01-18 Adjusting device for a thermal trip element

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US (1) US6816055B2 (en)
EP (1) EP1356488B1 (en)
CN (1) CN1224072C (en)
AT (1) ATE368935T1 (en)
DE (1) DE50210588D1 (en)
ES (1) ES2289074T3 (en)
WO (1) WO2002061785A1 (en)

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Publication number Publication date
WO2002061785A1 (en) 2002-08-08
CN1488157A (en) 2004-04-07
ATE368935T1 (en) 2007-08-15
US20040100350A1 (en) 2004-05-27
CN1224072C (en) 2005-10-19
US6816055B2 (en) 2004-11-09
DE50210588D1 (en) 2007-09-13
ES2289074T3 (en) 2008-02-01
EP1356488A1 (en) 2003-10-29

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