EP0213270B1 - Adjustable bimetallic trip device - Google Patents

Adjustable bimetallic trip device Download PDF

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Publication number
EP0213270B1
EP0213270B1 EP86105150A EP86105150A EP0213270B1 EP 0213270 B1 EP0213270 B1 EP 0213270B1 EP 86105150 A EP86105150 A EP 86105150A EP 86105150 A EP86105150 A EP 86105150A EP 0213270 B1 EP0213270 B1 EP 0213270B1
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EP
European Patent Office
Prior art keywords
bimetal
adjustment
holder
screw
arm
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
EP86105150A
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German (de)
French (fr)
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EP0213270A1 (en
Inventor
Harald Dipl.-Ing. Heil
Manfred Hohner
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.)
Lindner Fabrik Elektrischer Lampen und Apparate GmbH
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Lindner Fabrik Elektrischer Lampen und Apparate GmbH
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Application filed by Lindner Fabrik Elektrischer Lampen und Apparate GmbH filed Critical Lindner Fabrik Elektrischer Lampen und Apparate GmbH
Priority to AT86105150T priority Critical patent/ATE44190T1/en
Publication of EP0213270A1 publication Critical patent/EP0213270A1/en
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Publication of EP0213270B1 publication Critical patent/EP0213270B1/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • H01H37/20—Means for adjustment of "on" or "off" operating temperature by varying the position of the thermal element in relation to switch base or casing
    • 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

Definitions

  • the invention relates to an adjustable bimetallic tripping device with the features of the preamble of claim 1.
  • Such tripping devices are installed in particular in circuit breakers in order to provide protection against prolonged current overload of a line system above the rated current.
  • the adjustable bimetal release device in DE-25 04 954 may be mentioned as an example.
  • the bimetallic tripping device In order to ensure simple assembly of the bimetallic tripping device, it is mounted in a housing with a certain clearance, for example in the case of a circuit breaker. At the same time, reliable tripping must be maintained at a specific temperature corresponding to a specific overcurrent point.
  • the adjustment device described at the beginning is necessary for this.
  • An adjusting screw lying in the threaded bore of a base support acts on the apex area of an approximately V-shaped bimetal strip bimetal holder assembly with increasing screw-in depth against the release direction in such a way that the bimetal end is moved like a lever in the release direction. The extent of this movement determines the adjustment path available.
  • the base carrier can be a correspondingly shaped housing part, but a design as a separate component is also conceivable.
  • the invention is based on the knowledge that a considerable part of this adjustment path is not used for the actual adjustment process, but only because of the necessary presence of the relatively large free space around the bimetallic release device to facilitate assembly and to compensate for the tolerances in the mechanics as a free travel must be gone through.
  • the object of the invention is to provide an adjustable bimetallic release device which enables a quick, rational and yet finely adjustable adjustment.
  • This object is achieved in accordance with the characterizing features of claim 1.
  • the desired effect is achieved by dividing the dependency characteristics of the adjustment path of the bimetal free end on the number of screw turns into a quick and a fine adjustment range.
  • the bimetal strip free end moves a large distance along the adjustment path with just a few turns of the adjustment screw. So the actually interesting adjustment range is quickly reached.
  • the dependency characteristics the movement of the bimetal strip free end can then be controlled very finely by turning the adjusting screw in the fine adjustment range. An exact adjustment is possible.
  • the bimetallic holder has, between its leg end bent in the triggering direction, fastened to the base support and the V-apex, a projecting projection which protrudes against the screwing-in direction and which bears against the contact leg of the base support in the rapid adjustment range under pretension.
  • the device is therefore in the rapid setting range, which is characterized by the steeply rising flank of the dependency characteristic for the adjustment path / screw revolution.
  • the pretension of the bimetal holder is compensated by forces against the release direction.
  • the projecting lead lifts off from the surface of the base carrier contact leg facing it.
  • the lever-like movement now takes place around the area of the bimetal holder that is close to its attachment point. Due to the considerable extension of the V-arm lever arm of the bimetal release device with the lifting of the projecting projection while simultaneously shortening the lever arm located on the side of the bimetal free end, there is a considerable and quasi-sudden change in the dependency characteristics of the adjustment path / screw rotation. A much smaller adjustment distance of the bimetallic free end is now produced per screw revolution (fine adjustment range).
  • the preload of the bimetal holder can be adjusted constructively through the choice of material, shape and dimensioning.
  • the time at which the system projection is lifted off the counter-holder can be set via them. With a high preload this will take place later than with a lower one.
  • the dependency characteristic adjustment path / screw rotation Rotations with their transition from quick to fine adjustment range can therefore be adjusted in a practical manner by selecting a defined preload.
  • the characterizing feature of claim 5 describes a structurally simple implementation of the bimetal holder, in which the projecting projection according to the invention results from the shape of the holder itself.
  • the quick setting range is run through with a particularly small number of adjusting screw turns, since the V-arm lever arm is particularly short.
  • the dependency characteristics of the bimetallic release device can also be structurally adapted to the respective circumstances with regard to the quick and fine adjustment range.
  • the adjustable bimetallic release device shown schematically in FIGS. 1 to 4 contains a bimetallic strip 1, the free end 2 of which, in the event of thermal deformation, increasingly acts on the unlatching lever 3, for example of a line circuit breaker in the release direction 4.
  • the bimetallic strip 1 is fastened by a bimetallic holder 5, which is preferably made from an elastic sheet metal strip. This forms together with the bimetallic strip 1 essentially in the form of a V.
  • the fixed end 7 of the bimetallic strip 1 is fastened to the bimetallic holder 5 by means of crimping.
  • the holding end 8 of the bimetal holder 5 rests in parallel on the bimetal strip 1.
  • a right-angled base support 9 is used to fasten the bimetal holder 5.
  • it is rectangular, its support leg 10 extends in the triggering direction 4.
  • the leg end 11 of the bimetal holder 5 bent in this direction extends parallel to it.
  • a fixed connection between the two components is provided created by crimping (not shown).
  • the contact leg 12 of the base support 9 runs approximately parallel to the V-central longitudinal direction downwards. At the level of the V apex 6, it has a threaded bore 13 in which the adjusting screw 14 lies.
  • the dependence characteristic of the adjustment path of the bimetal strip free end 2 shown in FIG. 5 on the number of revolutions of the adjusting screw 14 is achieved. This is namely divided into a quick adjustment area 15 and a fine adjustment area 16.
  • the free end 2 of the bimetallic strip 1 quickly passes through the necessary assembly clearance in a housing, there is virtually a small "translation" between the adjusting screw and the adjustment path.
  • a fine adjustment of the bimetallic release device can be carried out due to the large translation between screw rotation and adjustment path.
  • the dependency characteristic shown results from the presence of the projecting projection 17 of the bimetal holder 5 projecting against the screwing direction between the bent leg end 11 and the V-apex 6 on the contact leg 12 of the base support 9.
  • the projecting projection 17 is formed by the approximately S-shaped design of the bimetal holder 5
  • the lower S-arm 18 bears with its outside under pretension in the triggering direction 4 on the contact leg 12 of the base support 9.
  • the contact projection 17 is arranged near the adjusting screw 14 of the bimetallic release device.
  • FIGS. 1 to 4 The functional sequence during the adjustment process is shown in FIGS. 1 to 4.
  • the free end 2 of the bimetal strip is at the beginning of the adjustment path 19.
  • the adjusting screw 14 acts on the area of the V-apex 6, as a result of which the bimetal strip-bimetal holder assembly rotates lever-like around the projecting projection 17 .
  • the free end 2 of the bimetallic strip 1 travels a relatively large distance (FIG. 2). If the pretensioning of the bimetal holder 5 in the triggering direction 4 is compensated for by the force of the adjusting screw 14, the contact projection 17 lifts off the contact leg 12 of the base support 9.

Abstract

1. An adjustable bimetal trip mechanism, in particular for fitting in protective circuit breakers, with - a bimetallic strip (1), - whose free end (2) is, in the case of a thermal deformation, increasingly acting on the control lever (delatching lever 3) of the trip mechanism in the tripping direction (4), - a bimetal holder (5), preferably made of a sheet metal strip, - which forms with the bimetallic strip (1) the two arms of a substantially V shaped part, the fixed end (7) of the bimetallic strip (1) in the V tip (6) being fixed to the bimetal holder (5), - a main support (9) designed to be bent, preferably at right angles, - whose support arm (10) extends approximately in the tripping direction (4) and forms the fixing support for the arm end (11) bent into this direction of the bimetal holder (5) and - whose bearing arm (12) extends approximately parallel to the median longitudinal direction of the V and - an adjustment screw (14), - which is inserted in a tapped hole (13) of the main support (9) and - which is increasingly acting on the tip region (6) of the V of the bimetal holder (5) as the screw is being screwed in against the tripping direction (4), in such a way that the free end (2) of the bimetal is moved slong its adjustment path (19) in the tripping direction (4) with a lever type action, characterised in that the adjustment path (19) of the free end (2) of the bimetal is divided, depending on the screwing in depth of the adjustment screw (14), into a rapid adjustment zone (15) with a large displacement path per turn of the screw, and a fine adjustment zone (16) with a small displacement path per turn of the screw.

Description

Die Erfindung betrifft eine justierbare Bimetall-Auslösevorrichtung mit den Merkmalen des Oberbegriffes des Anspruches 1. Solche Auslösevorrichtungen werden insbesondere in Leitungsschutzschalter eingebaut, um den Schutz vor längerwährender Stromüberlastung eines Leitungssystems über den Nennstrom zu übernehmen. Als Beispiel sei die justierbare Bimetall-Auslösevorrichtung in DE-25 04 954 genannt.The invention relates to an adjustable bimetallic tripping device with the features of the preamble of claim 1. Such tripping devices are installed in particular in circuit breakers in order to provide protection against prolonged current overload of a line system above the rated current. The adjustable bimetal release device in DE-25 04 954 may be mentioned as an example.

Um eine einfache Montage der Bimetall-Auslösevorrichtung zu gewährleisten, ist diese - beispielsweise bei einem Leitungsschutzschalter - in einem Gehäuse mit einem gewissen Freiraum montiert. Gleichzeitig muß eine zuverlässige Auslösung bei einer ganz bestimmten Temperatur entsprechend einem bestimmten Überstrompunkt eingehalten werden. Dazu ist die eingangs beschriebene Justiervorrichtung notwendig. Eine in der Gewindebohrung eines Grundträgers einliegende Justierschraube beaufschlagt den Scheitelbereich einer etwa V-förmigen BimetallstreifenBimetallhalter-Baugruppe mit zunehmender Einschraubtiefe derart entgegen der Auslöserichtung, daß das Bimetall-Freiende hebelartig in Auslöserichtung bewegt wird. Das Ausmaß dieser Bewegung legt den zur Verfügung stehenden Justierweg fest. Bei dem Grundträger kann es sich um ein entsprechend geformtes Gehäuseteil handeln, doch ist auch eine Ausführung als gesondertes Bauteil denkbar.In order to ensure simple assembly of the bimetallic tripping device, it is mounted in a housing with a certain clearance, for example in the case of a circuit breaker. At the same time, reliable tripping must be maintained at a specific temperature corresponding to a specific overcurrent point. The adjustment device described at the beginning is necessary for this. An adjusting screw lying in the threaded bore of a base support acts on the apex area of an approximately V-shaped bimetal strip bimetal holder assembly with increasing screw-in depth against the release direction in such a way that the bimetal end is moved like a lever in the release direction. The extent of this movement determines the adjustment path available. The base carrier can be a correspondingly shaped housing part, but a design as a separate component is also conceivable.

Die Erfindung geht von der Erkenntnis aus, daß ein beträchtlicher Teil dieses Justierweges nicht für den eigentlichen Justiervorgang verwendet wird, sondern lediglich wegen des notwendigen Vorhandenseins des relativ großen Freiraums um die Bimetall-Auslösevorrichtung zur Montageerleichterung und zum Ausgleich der in der Mechanik liegenden Toleranzen als Leerweg durchlaufen werden muß. Bei der etwa linearen Abhängigkeitscharakteristik des Verstellweges von der Zahl der Justierschraubenumdrehungen - bestenfalls ist eine leichte Abflachung dieser Abhängigkeit im Bereich der Justierendstellung feststellbar - wird eine große Einschraubtiefe der Justierschraube für das Durchlaufen dieses Leerweges verschwendet, während für den eigentlichen Justiervorgang nurmehr wenige Schraubenumdrehungen zur Verfügung stehen. Damit gestaltet sich der Justiervorgang selbst als unrationell und diffiziel.The invention is based on the knowledge that a considerable part of this adjustment path is not used for the actual adjustment process, but only because of the necessary presence of the relatively large free space around the bimetallic release device to facilitate assembly and to compensate for the tolerances in the mechanics as a free travel must be gone through. Given the approximately linear dependency of the adjustment path on the number of adjusting screw revolutions - at best a slight flattening of this dependency in the area of the adjusting position can be determined - a large screw-in depth of the adjusting screw is wasted for running through this free travel, while only a few screw revolutions are available for the actual adjustment process . This makes the adjustment process itself inefficient and difficult.

Aufgabe der Erfindung ist es, eine justierbare Bimetall-Auslösevorrichtung zu schaffen, die eine schnelle, rationelle und trotzdem fein einstellbare Justierung ermöglicht. Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen des Anspruches 1 gelöst. Durch die Einteilung der Abhängigkeitscharakteristik des Verstellweges des Bimetall-Freiendes von der Zahl der Schraubenumdrehungen in einen Schnell- und einen Feineinstellbereich wird der gewünschte Effekt erzielt. Zu Beginn des Justiervorganges - im Schnelleinstellbereich - bewegt sich das Bimetallstreifen-Freiende mit wenigen Umdrehungen der Justierschraube um eine große Strecke entlang des Justierweges. Damit wird der eigentlich interessante Justierbereich schnell erreicht. Durch die Änderung der Abhängigkeitscharakteristik kann anschließend im Feineinstellbereich die Bewegung des Bimetallstreifen-Freiendes durch Drehung der Justierschraube sehr fein gesteuert werden. Eine exakte Justierung ist damit möglich. Weiterhin wird die benötigte Einschraubtiefe, die Zahl der Schraubenumdrehungen für den gesamten Justiervorgang also, wesentlich gegenüber herkömmlichen Bimetall-Auslösevorrichtungen erniedrigt. Es sind auch Anwendungsfälle des Erfindungsgegenstandes denkbar, in denen durch eine entsprechend geänderte Auslegung der Einstellbereiche zwar gegenüber dem Stand der Technik keine geringere Einschraubtiefe erzielt wird, jedoch im Feineinstellbereich eine weit verbesserte Feinjustierung . möglich ist. Dies scheint bei Verwendung von Justierautomaten besonders vorteilhaft.The object of the invention is to provide an adjustable bimetallic release device which enables a quick, rational and yet finely adjustable adjustment. This object is achieved in accordance with the characterizing features of claim 1. The desired effect is achieved by dividing the dependency characteristics of the adjustment path of the bimetal free end on the number of screw turns into a quick and a fine adjustment range. At the start of the adjustment process - in the quick adjustment range - the bimetal strip free end moves a large distance along the adjustment path with just a few turns of the adjustment screw. So the actually interesting adjustment range is quickly reached. By changing the dependency characteristics, the movement of the bimetal strip free end can then be controlled very finely by turning the adjusting screw in the fine adjustment range. An exact adjustment is possible. Furthermore, the required screw-in depth, the number of screw revolutions for the entire adjustment process, is significantly reduced compared to conventional bimetallic release devices. Applications of the subject matter of the invention are also conceivable, in which a correspondingly changed design of the setting ranges does not achieve a smaller screw-in depth compared to the prior art, but in the fine setting range a much improved fine adjustment . is possible. This appears to be particularly advantageous when using automatic adjustment devices.

Bevorzugte Ausführungsformen des Erfindungsgegenstandes beschreiben die Kennzeichnungsmerkmale der Ansprüche 2 - 4. Der Bimetallhalter weist zwischen seinem in Auslöserichtung umgebogenen, am Grundträger befestigten Schenkelende und dem V-Scheitel einen entgegen der Einschraubrichtung vorstehenden Anlagevorsprung auf, der im Schnelleinstellbereich unter Vorspannung am Anlageschenkel des Grundträgers anliegt. Durch diesen Anlagevorsprung ist die momentan effektiv wirksame Hebellänge des Bimetallhalters erheblich verkürzt. Eine Beaufschlagung des V-Scheitels der Bimetallstreifen-Bimetallhalter-Baugruppe auf der kurzen Hebelarmseite durch die Justierschraube entgegen der Auslöserichtung hat also einen großen Verstellweg des als zweiter Hebelarm wirkenden Bimetall-Freiendes in Auslöserichtung zur Folge. Die Vorrichtung befindet sich also im Schnelleinstellbereich, der durch die steil ansteigende Flanke der Abhängigkeitscharakteristik für Verstellweg/Schraubenumdrehung charakterisiert ist. Mit zunehmender Beaufschlagung des kurzen Hebelarmes wird die Vorspannung des Bimetallhalters durch Kräfte entgegen der Auslöserichtung kompensiert. Der Anlagevorsprung hebt von der ihm zugewandten Fläche des Grundträger-Anlageschenkels ab. Die hebelartige Bewegung erfolgt nun um den nahe seines Befestigungspunktes liegenden Bereich des Bimetallhalters. Durch die beträchtliche Verlängerung des V-scheitelseitigen Hebelarmes der Bimetall-Auslösevorrichtung mit dem Abheben des Anlagevorsprunges bei gleichzeitiger Verkürzung des auf der Seite des Bimetall-Freiendes gelegenen Hebelarmes ergibt sich eine beträchtliche und quasi sprunghafte Anderung der Abhängigkeitscharakteristik von Verstellweg/Schraubenumdrehung. Pro Schraubenumdrehung wird nunmehr ein sehr viel kleinerer Verstellweg des Bimetall-Freiendes hervorgerufen (Feineinstellbereich).Preferred embodiments of the subject matter of the invention describe the characterizing features of claims 2-4. The bimetallic holder has, between its leg end bent in the triggering direction, fastened to the base support and the V-apex, a projecting projection which protrudes against the screwing-in direction and which bears against the contact leg of the base support in the rapid adjustment range under pretension. This system advantage significantly reduces the currently effective lever length of the bimetal holder. An action on the V-apex of the bimetal strip bimetal holder assembly on the short lever arm side by the adjusting screw against the release direction therefore results in a large adjustment path of the bimetal free end acting as the second lever arm in the release direction. The device is therefore in the rapid setting range, which is characterized by the steeply rising flank of the dependency characteristic for the adjustment path / screw revolution. With increasing loading of the short lever arm, the pretension of the bimetal holder is compensated by forces against the release direction. The projecting lead lifts off from the surface of the base carrier contact leg facing it. The lever-like movement now takes place around the area of the bimetal holder that is close to its attachment point. Due to the considerable extension of the V-arm lever arm of the bimetal release device with the lifting of the projecting projection while simultaneously shortening the lever arm located on the side of the bimetal free end, there is a considerable and quasi-sudden change in the dependency characteristics of the adjustment path / screw rotation. A much smaller adjustment distance of the bimetallic free end is now produced per screw revolution (fine adjustment range).

Die Vorspannung des Bimetallhalters kann durch Materialauswahl, Formgebung und dessen Dimensionierung konstruktiv eingestellt werden. Über sie ist der Zeitpunkt des Abhebens des Anlagevorsprunges vom Gegenhalter einstellbar. Bei einer hohen Vorspannung wird dies entsprechend später als bei einer niedrigeren stattfinden. Die Abhängigkeitscharakteristik Verstellweg/Schraubenumdrehungen mit ihrem Übergang von Schnell- in Feineinstellbereich kann also durch Auswahl einer definierten Vorspannung praxisgerecht angepaßt werden.The preload of the bimetal holder can be adjusted constructively through the choice of material, shape and dimensioning. The time at which the system projection is lifted off the counter-holder can be set via them. With a high preload this will take place later than with a lower one. The dependency characteristic adjustment path / screw rotation Rotations with their transition from quick to fine adjustment range can therefore be adjusted in a practical manner by selecting a defined preload.

Das Kennzeichnungsmerkmal des Anspruches 5 beschreibt eine konstruktiv einfache Realisierung des Bimetallhalters, bei der sich der erfindungsgemäße Anlagevorsprung aus der Form des Halters selbst ergibt.The characterizing feature of claim 5 describes a structurally simple implementation of the bimetal holder, in which the projecting projection according to the invention results from the shape of the holder itself.

Durch das Kennzeichnungsmerkmal des Anspruches 6 wird der Schnelleinstellbereich mit besonders wenigen Justierschraubenumdrehungen durchlaufen, da der V-scheitelseitige Hebelarm besonders kurz ist. Durch eine differenzierte Wahl der Hebelarmlänge kann die Abhängigkeitscharakteristik der Bimetall-Auslösevorrichtung ebenfalls hinsichtlich Schnell- und Feineinstellbereich den jeweiligen Gegebenheiten konstruktiv angepaßt werden.Due to the characterizing feature of claim 6, the quick setting range is run through with a particularly small number of adjusting screw turns, since the V-arm lever arm is particularly short. Through a differentiated choice of the lever arm length, the dependency characteristics of the bimetallic release device can also be structurally adapted to the respective circumstances with regard to the quick and fine adjustment range.

Durch die Abbiegung des unteren Halteendes des Bimetallhalters nach unten gemäß Kennzeichen des Anspruches 7 ist eine konstruktiv einfache Möglichkeit geschaffen, das Festende des Bimetallstreifens zuverlässig am Bimetallhalter zu befestigen. Es ist beispielsweise an Verschweißen oder Verlöten zu denken, auch eine Verkrimpung hat sich als vorteilhaft erwiesen. Durch die parallele Anlage von Bimetallstreifen und Bimetallhalter am V-Scheitel ist zudem eine exakte Führung des Bimetallstreifens entlang des Verstellweges gewährleistet. Dadurch werden die Justiereigenschaften weiter verbessert.By bending the lower holding end of the bimetal holder downward according to the characterizing part of claim 7, a structurally simple possibility is created to reliably fasten the fixed end of the bimetal strip to the bimetal holder. For example, welding or soldering should be considered, and crimping has also proven to be advantageous. The parallel arrangement of the bimetallic strip and the bimetallic holder on the V-apex also ensures exact guidance of the bimetallic strip along the adjustment path. This further improves the adjustment properties.

Die Erfindung wird an Hand der beiliegenden Figuren in einem Ausführungsbeispiel näher erläutert. Es zeigen dieThe invention is explained in more detail in an exemplary embodiment with reference to the accompanying figures. They show

Fig. 1 - 4 schematische Seitenansichten der Bimetall-Auslösevorrichtung in vier verschiedenen Stadien:

  • Fig. 1 am Beginn des Verstellweges,
  • Fig. 2 beim Durchfahren des Schnelleinstellbereiches,
  • Fig. 3 am Beginn des Feineinstellbereiches (Abheben des Anlagevorsprunges) und
  • Fig. 4 am Entklinkungspunkt.
  • Fig. 5 zeigt ein qualitatives Diagramm der Abhängigkeitscharakteristik Verstellweg/Schraubenumdrehung.
1 - 4 schematic side views of the bimetallic release device in four different stages:
  • 1 at the beginning of the adjustment path,
  • 2 when passing through the quick setting range,
  • Fig. 3 at the beginning of the fine adjustment range (lifting off the system projection) and
  • Fig. 4 at the unlatching point.
  • Fig. 5 shows a qualitative diagram of the dependency characteristic adjustment path / screw revolution.

Die in den Figuren 1 bis 4 schematisch in Seitenansicht dargestellte, justierbare Bimetall-Auslösevorrichtung enthält einen Bimetallstreifen 1, dessen Freiende 2 bei thermischer Verformung zunehmend den Entklinkungshebel 3 beispielsweise eines Leitungsschutzschalters in Auslöserichtung 4 beaufschlagt. Der Befestigung des Bimetallstreifens 1 dient ein Bimetallhalter 5, der vorzugsweise aus einem elastischen Metallblechstreifen gefertigt ist. Dieser bildet zusammen mit dem Bimetallstreifen 1 im wesentlichen die Form eines V. Am V-Scheitel 6 ist das Festende 7 des Bimetallstreifens 1 am Bimetall halter 5 mittels Verkrimpung befestigt. Dazu liegt das Halteende 8 des Bimetallhalters 5 parallel am Bimetallstreifen 1 an.The adjustable bimetallic release device shown schematically in FIGS. 1 to 4 contains a bimetallic strip 1, the free end 2 of which, in the event of thermal deformation, increasingly acts on the unlatching lever 3, for example of a line circuit breaker in the release direction 4. The bimetallic strip 1 is fastened by a bimetallic holder 5, which is preferably made from an elastic sheet metal strip. This forms together with the bimetallic strip 1 essentially in the form of a V. On the V apex 6, the fixed end 7 of the bimetallic strip 1 is fastened to the bimetallic holder 5 by means of crimping. For this purpose, the holding end 8 of the bimetal holder 5 rests in parallel on the bimetal strip 1.

Ein rechtwinklig geformter Grundträger 9 dient zur Befestigung des Bimetallhalters 5. Dazu ist er rechtwinklig ausgebildet, sein Trägerschenkel 10 verläuft in Auslöserichtung 4. In paralleler Anlage dazu erstreckt sich das in diese Richtung umgebogene Schenkelende 11 des Bimetallhalters 5. Eine feste Verbindung zwischen beiden Bauteilen ist durch eine Verkrimpung (nicht dargestellt) geschaffen. Der Anlageschenkel 12 des Grundträgers 9 verläuft etwa parallel zur V-Mittellängsrichtung nach unten. Auf der Höhe des V-Scheitels 6 weist er eine Gewindebohrung 13 auf, in der die Justierschraube 14 einliegt. Diese beaufschlagt den Bimetallhalter 5 im Bereich des V-Scheitels 6 mit zunehmender Einschraubtiefe entgegen der Auslöserichtung 4, wodurch das Freiende 2 des Bimetallstreifens 1 entlang seines Justierweges 19 hebelartig in Auslöserichtung 4 bewegt wird.A right-angled base support 9 is used to fasten the bimetal holder 5. For this purpose, it is rectangular, its support leg 10 extends in the triggering direction 4. The leg end 11 of the bimetal holder 5 bent in this direction extends parallel to it. A fixed connection between the two components is provided created by crimping (not shown). The contact leg 12 of the base support 9 runs approximately parallel to the V-central longitudinal direction downwards. At the level of the V apex 6, it has a threaded bore 13 in which the adjusting screw 14 lies. This acts on the bimetal holder 5 in the region of the V-apex 6 with increasing screw-in depth against the triggering direction 4, whereby the free end 2 of the bimetal strip 1 is moved in a lever-like manner in the triggering direction 4 along its adjustment path 19.

Durch die besondere Formgebung des Bimetallhalters wird die in Fig. 5 dargestellte Abhängigkeitscharakteristik des Verstellweges des Bimetallstreifen-Freiendes 2 von der Zahl der Umdrehungen der Justierschraube 14 erzielt. Diese ist nämlich in einen Schnelleinstellbereich 15 und einer Feineinstellbereich 16 aufgeteilt. Im ersten durchläuft das Freiende 2 des Bimetallstreifens 1 den notwendigerweise vorhandenen Montage-Freiraum in einem Gehäuse schnell, es ist quasi eine kleine "Übersetzung" zwischen Justierschraube und Verstellweg vorhanden. Nach dem Ubergang in den Feineinstellbereich kann wegen der großen Übersetzung zwischen Schraubenumdrehung und Verstellweg eine Feinjustage der Bimetall-Auslösevorrichtung vorgenommen werden.Due to the special shape of the bimetal holder, the dependence characteristic of the adjustment path of the bimetal strip free end 2 shown in FIG. 5 on the number of revolutions of the adjusting screw 14 is achieved. This is namely divided into a quick adjustment area 15 and a fine adjustment area 16. In the first, the free end 2 of the bimetallic strip 1 quickly passes through the necessary assembly clearance in a housing, there is virtually a small "translation" between the adjusting screw and the adjustment path. After the transition to the fine adjustment range, a fine adjustment of the bimetallic release device can be carried out due to the large translation between screw rotation and adjustment path.

Die dargestellte Abhängigkeitscharakteristik ergibt sich durch das Vorhandensein des entgegen der Einschraubrichtung vorstehenden Anlagevorsprunges 17 des Bimetallhalters 5 zwischen dem umgebogenen Schenkelende 11 und dem V-Scheitel 6 am Anlageschenkel 12 des Grundträgers 9. Der Anlagevorsprung 17 entsteht durch die etwa S-förmige Ausbildung des Bimetallhalters 5. Der untere S-Bogen 18 liegt mit seiner Außenseite unter Vorspannung in Auslöserichtung 4 am Anlageschenkel 12 des Grundträgers 9 an. Der Anlagevorsprung 17 ist dabei nahe der Justierschraube 14 der Bimetall-Auslösevorrichtung angeordnet.The dependency characteristic shown results from the presence of the projecting projection 17 of the bimetal holder 5 projecting against the screwing direction between the bent leg end 11 and the V-apex 6 on the contact leg 12 of the base support 9. The projecting projection 17 is formed by the approximately S-shaped design of the bimetal holder 5 The lower S-arm 18 bears with its outside under pretension in the triggering direction 4 on the contact leg 12 of the base support 9. The contact projection 17 is arranged near the adjusting screw 14 of the bimetallic release device.

Der Funktionsablauf beim Justiervorgang ist in den Fig. 1 bis 4 dargestellt. In Fig. 1 befindet sich das Freiende 2 des Bimetallstreifens am Beginn des Justierweges 19. Bei Eindrehen der Justierschraube 14 entgegen der Auslöserichtung 4 beaufschlagt sie den Bereich des V-Scheitels 6, wodurch sich die Bimetallstreifen-Bimetallhalter-Baugruppe um den Anlagevorsprung 17 hebelartig dreht. Durch den kurzen Hebel-rm auf der Beaufschlagungsseite legt das Freiende 2 des Bimetallstreifens 1 einen relativ großen Weg zurück (Fig. 2). Ist durch die Beaufschlagungskraft der Justierschraube 14 die Vorspannung des Bimetallhalters 5 in Auslöserichtung 4 kompensiert, so hebt der Anlagevorsprung 17 vom Anlageschenkel 12 des Grundträgers 9 ab. Bei einer weiteren Beaufschlagung des V-Scheitels 6 durch die Justierschraube 14 dreht sich die Anordnung nunmehr im Prinzip um den oberen Befestigungsbereich 20 des Bimetallhalters 5 am Grundträger 9 (Fig. 3). Bei weiterem Eindrehen der Justierschraube 14 wird das Freiende 2 des Bimetallstreifens 1 nur noch um kleine Wege verschoben, da der Hebelarm zwischen Beaufschlagungsstelle und Befestigungsstelle weitaus länger ist. Dadurch ist im Feineinstellbereich 16 eine exakte Justage der Auslösevorrichtung möglich. In der Praxis wird dabei die Justierschraube 14 bis zum Auslösen der Vorrichtung (Fig. 4) ein- und anschließend um eine definierte Zahl von Umdrehungen zurückgedreht.The functional sequence during the adjustment process is shown in FIGS. 1 to 4. In Fig. 1, the free end 2 of the bimetal strip is at the beginning of the adjustment path 19. When the adjusting screw 14 is screwed in against the triggering direction 4, it acts on the area of the V-apex 6, as a result of which the bimetal strip-bimetal holder assembly rotates lever-like around the projecting projection 17 . Due to the short lever arm on the loading side, the free end 2 of the bimetallic strip 1 travels a relatively large distance (FIG. 2). If the pretensioning of the bimetal holder 5 in the triggering direction 4 is compensated for by the force of the adjusting screw 14, the contact projection 17 lifts off the contact leg 12 of the base support 9. When the V-apex 6 is further acted upon by the adjusting screw 14, the arrangement now in principle rotates around the upper fastening region 20 of the bimetal holder 5 on the base bracket ger 9 (Fig. 3). When the adjusting screw 14 is screwed in further, the free end 2 of the bimetallic strip 1 is only displaced by small distances, since the lever arm between the application point and the fastening point is much longer. This enables an exact adjustment of the triggering device in the fine adjustment area 16. In practice, the adjusting screw 14 is screwed in until the device is triggered (FIG. 4) and then turned back by a defined number of revolutions.

Durch den Freiraum zwischen Bimetallhalter 5 und Grundträger 9 im Bereich des oberen S-Bogens 21 wird sofort nach Abheben ces Anlagevorsprunges 17 ein möglichst langer Hebelarm erzielt. Auch ist der Ubergang zwischen Schnell- (15) und Feineinstellbereich (16) damit quasi sprunghaft.Due to the space between the bimetallic holder 5 and the base support 9 in the area of the upper S-bow 21, the longest possible arm is achieved immediately after lifting off the ces projection 17. The transition between the quick (15) and fine adjustment range (16) is therefore almost leaping.

Claims (7)

1. An adjustable bimetal trip mechanism, in particular for fitting in protective circuit breakers, with
- a bimetallic strip (1),
- whose free end (2) is, in the case of a thermal deformation, increasingly acting on the control lever (delatching lever 3) of the trip mechanism in the tripping direction (4),
- a bimetal holder (5), preferably made of a sheet metal strip,
- which forms with the bimetallic strip (1) the two arms of a substantially V shaped part, the fixed end (7) of the bimetallic strip (1) in the V tip (6) being fixed to the bimetal holder (5),
- a main support (9) designed to be bent, preferably at right angles,
- whose support arm (10) extends approximately in the tripping direction (4) and forms the fixing support for the arm end (11) bent into this direction of the bimetal holder (5) and
- whose bearing arm (12) extends approximately parallel to the median longitudinal direction of the V and
- an adjustment screw (14),
- which is inserted in a tapped hole (13) of the main support (9) and
- which is increasingly acting on the tip region (6) of the V of the bimetal holder (5) as the screw is being screwed in against the tripping direction (4), in such a way that the free end (2) of the bimetal is moved slong its adjustment path (19) in the tripping direction (4) with a lever type action, characterised in that the adjustment path (19) of the free end (2) of the bimetal is divided, depending on the screwing in depth of the adjustment screw (14), into a rapid adjustment zone (15) with a large displacement path per turn of the screw, and a fine adjustment zone (16) with a small displacement path per turn of the screw.
2. A bimetal trip mechanism according to claim 1, characterised in that the bimetal holder (5) has a bearing projection (17) projecting against the screwing-in direction, arranged between the arm end (11) and the V tip (6), which projection bears in the rapid adjustment zone (15) in a prestressed condition on the bearing arm (12) of the main support (9).
3. A bimetal trip mechanism according to claim 2, characterised in that in the fine adjustment zone (16), the bearing projection (17) is lifted off from the bearing arm (12) of the main support (9).
4. A bimetal trip mechanism according to claim 3, characterised in that in the transition from the rapid adjustment zone (15) to the fine adjustment zone (16), the bearing projection (17) is lifted off from the bearing arm (12) of the main support by the action of the adjustment screw (14) in the screwing-in direction on the V tip (6).
5. A bimetal trip mechanism according to one of the preceding claims, characterised in that the bimetal holder (5) is approximately S-shaped between its bent arm end (11) and the V tip (6), the lower S curve (18) bearing, as the bearing projection (17) with its outer side on the surface facing it of the bearing arm (12) of the main support.
6. A bimetal trip mechanism according to one of claims 2 to 5, characterised in that in a zone near the adjustment screw (14), the bearing projection (17) bears on the bearing arm (12) of the main support (9).
7. A bimetal trip mechanism according to one of claims 2 to 5, characterised in that the lower end (holder end 8) of the bimetal holder (5) is bent down for the parallel application of the fixed end (7) of the bimetallic strip (1).
EP86105150A 1985-05-11 1986-04-15 Adjustable bimetallic trip device Expired EP0213270B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86105150T ATE44190T1 (en) 1985-05-11 1986-04-15 ADJUSTABLE BIMETAL TRIP DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853517039 DE3517039A1 (en) 1985-05-11 1985-05-11 ADJUSTABLE BIMETAL RELEASE DEVICE
DE3517039 1985-05-11

Publications (2)

Publication Number Publication Date
EP0213270A1 EP0213270A1 (en) 1987-03-11
EP0213270B1 true EP0213270B1 (en) 1989-06-21

Family

ID=6270494

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86105150A Expired EP0213270B1 (en) 1985-05-11 1986-04-15 Adjustable bimetallic trip device

Country Status (4)

Country Link
EP (1) EP0213270B1 (en)
AT (1) ATE44190T1 (en)
DE (2) DE3517039A1 (en)
GR (1) GR861196B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7693610B2 (en) 2001-07-10 2010-04-06 Yingco Electronic Inc. Remotely controllable wireless energy control unit
US7961073B2 (en) 2001-07-10 2011-06-14 Yingco Electronic Inc. Controllable electronic switch

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Publication number Priority date Publication date Assignee Title
US4780697A (en) * 1987-04-02 1988-10-25 Texas Instruments Incorporated Miniature circuit breaker with improved longevity
FR2735614B1 (en) * 1995-06-19 1997-07-18 Schneider Electric Sa DEVICE FOR ADJUSTING THE THERMAL TRIGGER OF A CIRCUIT BREAKER
US6816055B2 (en) 2001-01-31 2004-11-09 Siemens Aktiengesellschaft Adjusting device for a thermal trip element
ES2266548T3 (en) 2001-07-02 2007-03-01 Siemens Aktiengesellschaft ADJUSTMENT DEVICE FOR A THERMAL SWITCH.
US6636141B2 (en) 2001-07-10 2003-10-21 Yingco Electronic Inc. Controllable electronic switch
DE10327379A1 (en) * 2003-06-18 2005-01-05 Abb Patent Gmbh Adjustment device for altering release characteristics of thermic or electromagnetic release device in line protection switch using adjustment screw for altering spring force opposing release movement
DE102011004216A1 (en) * 2011-02-16 2012-08-16 Siemens Aktiengesellschaft Adjusting device for use in thermal magnetic trip device of power switch for adjusting tip of bimetallic strip, has holder whose actuation element is designed as screw and connected to expandable metal sheet
DE102012200544A1 (en) * 2012-01-16 2013-07-18 Siemens Aktiengesellschaft Device for adjustment of tip of bimetallic strip in thermal-magnetic trip device of electrical switch i.e. power switch, has actuating unit and deformable legs that are tilted with strip such that tip of strip is able to be adjusted

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Publication number Priority date Publication date Assignee Title
GB502052A (en) * 1937-11-13 1939-03-10 Schiele Industriewerke Improvements in, or relating to, thermally-operated tripping devices for use in connection with automatic circuit breakers and similar electrical switchgear
DE7508649U (en) * 1974-05-14 1975-08-28 Kopp H High performance circuit breaker

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7693610B2 (en) 2001-07-10 2010-04-06 Yingco Electronic Inc. Remotely controllable wireless energy control unit
US7925388B2 (en) 2001-07-10 2011-04-12 Yingco Electronics, Inc. Remotely controllable wireless energy control unit
US7961073B2 (en) 2001-07-10 2011-06-14 Yingco Electronic Inc. Controllable electronic switch

Also Published As

Publication number Publication date
DE3517039A1 (en) 1986-11-13
GR861196B (en) 1986-09-09
EP0213270A1 (en) 1987-03-11
DE3664078D1 (en) 1989-07-27
ATE44190T1 (en) 1989-07-15

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