EP0213270A1 - Adjustable bimetallic trip device - Google Patents

Adjustable bimetallic trip device Download PDF

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Publication number
EP0213270A1
EP0213270A1 EP86105150A EP86105150A EP0213270A1 EP 0213270 A1 EP0213270 A1 EP 0213270A1 EP 86105150 A EP86105150 A EP 86105150A EP 86105150 A EP86105150 A EP 86105150A EP 0213270 A1 EP0213270 A1 EP 0213270A1
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EP
European Patent Office
Prior art keywords
bimetal
screw
holder
adjustment
bimetallic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86105150A
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German (de)
French (fr)
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EP0213270B1 (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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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 basic 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 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 must be run as an empty path. 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.
  • 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 bimetal 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-side lever arm of the bimetallic release device when the System advantage with simultaneous shortening of the lever arm located on the side of the bimetal free end results in a considerable and quasi-sudden change in the dependency characteristics of the adjustment path / screw revolution. 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 of the adjustment path / screw revolutions with its transition from the quick to the fine adjustment range can therefore be adapted 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. Together with the bimetal strip 1, this essentially forms the shape of a V.
  • the fixed end 7 of the bimetal strip 1 on the bimetal holder 5 attached 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 lies with its outer side 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 basic 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 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 must be run as an empty path. 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. They are too Applications of the subject matter of the invention are 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 a far improved fine adjustment is possible in the fine setting range. 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 Änderung 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 bimetal 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-side lever arm of the bimetallic release device when the System advantage with simultaneous shortening of the lever arm located on the side of the bimetal free end results in a considerable and quasi-sudden change in the dependency characteristics of the adjustment path / screw revolution. 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 of the adjustment path / screw revolutions with its transition from the quick to the fine adjustment range can therefore be adapted 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 downwards according to the characterizing part of the claim 7, a structurally simple possibility is created to reliably attach 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 die

  • 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.
The invention is explained in more detail in an exemplary embodiment with reference to the accompanying figures. They show
  • 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. Together with the bimetal strip 1, this essentially forms the shape of a V. At the V apex 6 is the fixed end 7 of the bimetal strip 1 on the bimetal holder 5 attached 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 lies with its outer side 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-crest 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 support 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 is in the fine adjustment range 16 an exact adjustment of the triggering device possible. 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.

BezugszeichenlisteReference symbol list

  • 1 Bimetallstreifen1 bimetal strip
  • 2 Freiende2 free users
  • 3 Entklinkungshebel3 unlatching levers
  • 4 Auslöserichtung4 Release direction
  • 5 Bimetallhalter5 bimetal holders
  • 6 V-Scheitel6 V apex
  • 7 Festende7 fixed ends
  • 8 Halteende8 stopping ends
  • 9 Grundträger9 basic carriers
  • 10 Trägerschenkel10 carrier legs
  • 11 Schenkelende11 leg end
  • 12 Anlageschenkel12 contact legs
  • 13 Gewindebohrung13 threaded hole
  • 14 Justierschraube14 adjusting screw
  • 15 Schnelleinstellbereich15 Quick setting range
  • 16 Feineinstellbereich16 fine adjustment range
  • 17 Anlagepunkt17 contact point
  • 18 S-Bogen (unten)18 S-arm (below)
  • 19 Justierweg19 adjustment path
  • 20 Befestigungsbereich20 fastening area
  • 21 S-Bogen (oben)21 S-arm (top)

Claims (7)

1. Justierbare Bimetall-Auslösevorrichtung, insbesondere zum Einbau in Leitungsschutzschalter, mit
- einem Bimetallstreifen (1),
-- dessen Freiende (2) bei thermischer Verformung zunehmend den Steuerhebel (Entklinkungshebel 3) der Auslösevorrichtung in Auslöserichtung (4) beaufschlagt,
- einem vorzugsweise aus einem Metallblechstreifen gefertigten Bimetallhalter (5),
-- der mit dem Bimetallstreifen (1) die beiden Schenkel im wesentlichen eines V bildet, wobei im V-Scheitel (6) das Festende (7) des Bimetall­streifens (1) am Bimetallhalter (5) fixiert ist,
- einem winklig, vorzugsweise rechtwinklig ausgebil­deten Grundträger (9),
-- dessen Trägerschenkel (10) sich etwa in Auslöse­richtung (4) erstreckt und Befestigungslager des in diese Richtung umgebogenen Schenkelendes (11) des Bimetallhalters (5) ist und
-- dessen Anlageschenkel (12) etwa parallel zur V-Mittellängsrichtung verläuft und
- einer Justierschraube (14),
-- die in einer Gewindebohrung (13) des Grundträ­gers (9) einliegt und
-- die den V-Scheitelbereich (6) des Bimetallhal­ters (5) mit zunehmender Einschraubtiefe entgegen der Auslöserichtung (4) derart beaufschlagt, daß das Bimetallfreiende (2) entlang seines Justierweges (19) hebelartig in Auslöserichtung (4) bewegt wird,
dadurch gekennzeichnet,
daß der Justierweg (19) des Bimetallfreiendes (2) in Abhängigkeit der Einschraubtiefe der Justierschraube (14) in einen Schnelleinstellbereich (15) mit großem Verstellweg/Schraubenumdrehung und einen Feineinstell­bereich (16) mit kleinem Verstellweg/Schraubenumdrehung geteilt ist.1. Adjustable bimetallic tripping device, especially for installation in miniature circuit breakers
- a bimetal strip (1),
the free end (2) of which is subjected increasingly to the control lever (unlatching lever 3) of the release device in the release direction (4) during thermal deformation,
a bimetal holder (5) preferably made from a sheet metal strip,
- which forms the two legs with the bimetal strip (1) essentially in a V, the fixed end (7) of the bimetal strip (1) being fixed to the bimetal holder (5) in the V-apex (6),
- an angular, preferably rectangular base support (9),
- The support leg (10) extends approximately in the release direction (4) and mounting bearing of the bent leg end in this direction (11) of the bimetal holder (5) and
- The contact leg (12) extends approximately parallel to the V-longitudinal direction and
- an adjusting screw (14),
- Which lies in a threaded bore (13) of the base support (9) and
- The V-apex region (6) of the bimetal holder (5) acts with increasing screw-in depth against the triggering direction (4) in such a way that the bimetal-free end (2) is moved lever-like in the triggering direction (4) along its adjustment path (19),
characterized,
that the adjustment path (19) of the bimetallic end (2), depending on the screw-in depth of the adjustment screw (14), is divided into a quick adjustment range (15) with a large adjustment range / screw revolution and a fine adjustment range (16) with a small adjustment range / screw revolution. 2. Bimetall-Auslösevorrichtung nach Anspruch 1,
dadurch gekennzeichnet,
daß der Bimetallhalter (5) einen entgegen der Ein­schraubrichtung vorstehenden, zwischen dem Schenkelende (11) und V-Scheitel (6) angeordneten Anlagevorsprung (17) aufweist, der im Schnelleinstellbereich (15) unter Vorspannung am Anlageschenkel (12) des Grundträgers (9) anliegt.2. Bimetallic release device according to claim 1,
characterized,
that the bimetallic holder (5) has a projecting projection (17) which protrudes in the opposite direction to the screwing in and is arranged between the leg end (11) and V-apex (6) and which is pretensioned on the contact leg (12) of the base support (9) in the quick setting area (15) is present. 3. Bimetall-Auslösevorrichtung nach Anspruch 2,
dadurch gekennzeichnet,
daß der Anlagevorsprung (17) im Feineinstellbereich (16) vom Anlageschenkel (12) des Grundträgers (9) abgehoben ist.3. Bimetal release device according to claim 2,
characterized,
that the contact projection (17) is lifted in the fine adjustment area (16) from the contact leg (12) of the base support (9). 4. Bimetall-Auslösevorrichtung nach Anspruch 3,
dadurch gekennzeichnet,
daß der Anlagevorsprung (17) beim Übergang vom Schnell- (15) zum Feineinstellbereich (16) durch die Beaufschla­gung des V-Scheitels (6) durch die Justierschraube (14) in Einschraubrichtung vom Anlageschenkel (12) des Grundträgers abgehoben wird.4. Bimetal release device according to claim 3,
characterized,
that the system projection (17) during the transition from the quick (15) to the fine adjustment range (16) by the application of the V-part (6) by the adjusting screw (14) in the screwing direction is lifted from the contact leg (12) of the base support. 5. Bimetall-Auslösevorrichtung nach einem der vorgenannten Ansprüche,
dadurch gekennzeichnet,
daß der Bimetallhalter (5) zwischen seinem umgebo­genen Schenkelende (11) und dem V-Scheitel (6) etwa S-förmig ausgebildet ist, wobei der untere S-Bogen (18) als Anlagevorsprung (17) mit seiner Außenseite an der ihm zugewandten Fläche des Grundträger-Anla­geschenkels (12) anliegt.5. Bimetal release device according to one of the preceding claims,
characterized,
that the bimetal holder (5) between its bent leg end (11) and the V-apex (6) approximately S-shaped, the lower S-bend (18) as an abutment projection (17) lies with its outside against the surface of the base carrier abutment leg (12) facing it. 6. Bimetall-Auslösevorrichtung nach einem der Ansprü­che 2 bis 5,
dadurch gekennzeichnet,
daß der Anlagevorsprung (17) in einem Bereich nahe der Justierschraube (14) am Anlageschenkel (12) des Grundträgers (9) anliegt.6. Bimetal release device according to one of claims 2 to 5,
characterized,
that the contact projection (17) rests in an area near the adjusting screw (14) on the contact leg (12) of the base support (9). 7. Bimetall-Auslösevorrichtung nach einem der Ansprü­che 2 bis 5,
dadurch gekennzeichnet,
daß das untere Ende (Halteende 8) des Bimetallhal­ters (5) zur parallelen Anlage des Festendes (7) des Bimetallstreifens (1) nach unten abgebogen ist.7. Bimetal release device according to one of claims 2 to 5,
characterized,
that the lower end (holding end 8) of the bimetallic holder (5) for the parallel contact of the fixed end (7) of the bimetallic strip (1) is bent downwards.
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 true EP0213270A1 (en) 1987-03-11
EP0213270B1 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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003005395A1 (en) * 2001-07-02 2003-01-16 Siemens Aktiengesellschaft Adjusting device for a thermal trip
US6636141B2 (en) 2001-07-10 2003-10-21 Yingco Electronic Inc. Controllable electronic switch
US6816055B2 (en) * 2001-01-31 2004-11-09 Siemens Aktiengesellschaft Adjusting device for a thermal trip element
US7265652B2 (en) 2001-07-10 2007-09-04 Yingco Electronic Inc. Controllable electronic switch
US7324876B2 (en) 2001-07-10 2008-01-29 Yingco Electronic Inc. System for remotely controlling energy distribution at local sites

Families Citing this family (5)

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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
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

Citations (2)

* Cited by examiner, † Cited by third party
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
FR2271656A1 (en) * 1974-05-14 1975-12-12 Kopp Theodor Simoneit

Patent Citations (2)

* Cited by examiner, † Cited by third party
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
FR2271656A1 (en) * 1974-05-14 1975-12-12 Kopp Theodor Simoneit

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6816055B2 (en) * 2001-01-31 2004-11-09 Siemens Aktiengesellschaft Adjusting device for a thermal trip element
WO2003005395A1 (en) * 2001-07-02 2003-01-16 Siemens Aktiengesellschaft Adjusting device for a thermal trip
US7135953B2 (en) 2001-07-02 2006-11-14 Siemens Aktiengesellschaft Adjusting device for a thermal trip
US6636141B2 (en) 2001-07-10 2003-10-21 Yingco Electronic Inc. Controllable electronic switch
US7265652B2 (en) 2001-07-10 2007-09-04 Yingco Electronic Inc. Controllable electronic switch
US7324876B2 (en) 2001-07-10 2008-01-29 Yingco Electronic Inc. System for remotely controlling energy distribution at local sites
US7688175B2 (en) 2001-07-10 2010-03-30 I/O Controls Corporation Controllable electronic switch
US10074498B2 (en) 2001-07-10 2018-09-11 I/O Controls Corporation Controllable electronic switch

Also Published As

Publication number Publication date
DE3517039A1 (en) 1986-11-13
EP0213270B1 (en) 1989-06-21
GR861196B (en) 1986-09-09
ATE44190T1 (en) 1989-07-15
DE3664078D1 (en) 1989-07-27

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