EP0148111A2 - Contact system with an electrodynamic opening - Google Patents

Contact system with an electrodynamic opening Download PDF

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Publication number
EP0148111A2
EP0148111A2 EP84730132A EP84730132A EP0148111A2 EP 0148111 A2 EP0148111 A2 EP 0148111A2 EP 84730132 A EP84730132 A EP 84730132A EP 84730132 A EP84730132 A EP 84730132A EP 0148111 A2 EP0148111 A2 EP 0148111A2
Authority
EP
European Patent Office
Prior art keywords
contact
spring arrangement
guide
contact part
rotatable
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
EP84730132A
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German (de)
French (fr)
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EP0148111B1 (en
EP0148111A3 (en
Inventor
Bernhard Preuss
Karl-Heinz Manthe
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP0148111A2 publication Critical patent/EP0148111A2/en
Publication of EP0148111A3 publication Critical patent/EP0148111A3/en
Application granted granted Critical
Publication of EP0148111B1 publication Critical patent/EP0148111B1/en
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/104—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement with a stable blow-off position

Definitions

  • the invention relates to an electro-dynamically opening contact system with a fixed contact part and a contact part rotatably arranged about an axis of rotation, and with a prestressed spring arrangement which is held stationary at one end and engages the rotatable contact part at its other end in such a way that the spring arrangement causes a contact pressure when the contact is closed and generates a torque when the contact is open.
  • Such an electro-dynamically opening contact system known from DE-PS 1 079 176, has a spring arrangement with two prestressed tension springs arranged in parallel. These are held stationary at their respective ends and are suspended at their respective other ends on a bolt which penetrates the rotatable contact part transversely.
  • the two tension springs generate a contact force via the rotatable contact part.
  • the rotatable contact part is thrown away from the fixed contact part by the action of electro-dynamic force against the contact force applied by the spring arrangement.
  • With a predetermined opening angle between the fixed and the rotatable contact part the direction of the torque exerted by the spring arrangement on the rotatable contact part reverses, so that the spring arrangement now accelerates the further opening of the contact.
  • the invention has for its object to provide an electro-dynamically opening contact system which has a relatively high contact force in the closed state and opens particularly quickly and safely when an overcurrent occurs.
  • the rotatable contact part has a guide extending transversely to its axis of rotation, that the spring arrangement is oriented so that when the contact is closed, its line of action runs approximately at right angles to the guide and that other end of the spring arrangement is slidably mounted along this guide.
  • a major advantage of the contact system according to the invention is that when the contact is closed, because of the approximately vertical action of the spring force on the guide of the movable contact part, the force component of the spring arrangement effective for generating the contract pressure and thus the contact force is particularly large.
  • Another advantage of the contact system according to the invention results from the displaceable arrangement of the point of application of the spring arrangement on the rotatable contact part, because in the event of an overcurrent the spring arrangement accelerates the further opening of the contact even after the contact has opened only slightly by means of electro-dynamic forces.
  • the guide can have such a contour that the torque exerted by the spring arrangement on the movable contact part during the opening of the contact takes on optimal values depending on the opening angle with regard to a higher opening speed.
  • the spring arrangement has a roller at one end which runs along the guide. It is thereby achieved that the other end of the spring arrangement moves with particularly little friction along the guide of the rotatable contact part during the opening of the contact, so that the opening process takes place particularly quickly and safely.
  • the guide has two stops for the end positions of the other end of the spring arrangement. These stops ensure that the other end of the spring arrangement is moved in the guide against the respective stop both when opening and when closing the contact, so that the rotatable contact part bzu after completion of the opening. Closing process can not perform any vibratory movements. In this way, bouncing phenomena are prevented when the contact system is actuated.
  • a particularly simple construction of the contact system according to the invention is achieved in that the guide is formed by a recess in the rotatably arranged contact part is and that the ends of the recess represent the stops of the guide.
  • a particularly compact structure of the contact system according to the invention can be achieved in that the spring arrangement consists of two tension springs which are arranged on both sides of the rotatable contact part.
  • the contact system shown in Figures 1 to 3 has a U-shaped angled fixed contact part 1 and a further rotatable contact part 2, which is mounted in a housing part 3 or a switch part of the circuit breaker about an axis of rotation 4.
  • the contact system further contains a spring arrangement 5, consisting of two prestressed tension springs 6 and 7, which are arranged parallel to each other on both sides of the rotatable contact part 2.
  • the two tension springs 6 and 7 are each fixed at one end 6a to a bolt 8 which penetrates the housing 3 transversely. At their other end 6b bzu.
  • the roller 9 When the contact is closed, the roller 9 lies in the guide 10 on the stop 11 and transmits the spring force of the spring arrangement to the movable contact part 2 such that it is pressed against the fixed contact part 1 with a predetermined contact pressure.
  • the rotatable contact part 2 and one leg of the U-shaped fixed contact part 1 are parallel to one another and form a current loop. As soon as the current in this current loop exceeds a predetermined value, electro-dynamic forces acting on the rotatable contact part 2 counteracting the contact pressure or the force of the spring arrangement 5, which lift the rotatable contact part 2 from the fixed contact part 1.
  • the roller 9 moves in the guide 10 from its position on the stop 11 in the direction of the stop 12.
  • the respective position of the roller 9 as a function of the opening angle between the fixed contact part and the rotating contact part 2 is determined in that the Spring arrangement 5 strives to apply the lowest possible spring force, so that the line of action of the spring force applied by spring arrangement 5 always runs perpendicular to the direction of freedom of movement of roller 9 in guide 10.
  • the line of action of the spring force moves through the axis of rotation 4 of the rotatable contact part 2, the torque exerted by the spring arrangement 5 on the rotatable contact part 2 reversing its direction.
  • the spring arrangement 5 causes a further opening of the contact with its spring force until the movable con Clock part 2 strikes against a stop device 13.
  • the exemplary embodiment of the contact system according to the invention shown in FIGS. 4 and 5, like the exemplary embodiment described above, has a fixed contact part 20 and a contact part 23 which can be rotated about an axis of rotation 22 in a housing part 21 or in a switching shaft part.
  • the rotatable contact part 23 contains a recess which represents a guide 24 and the ends of which form two stops 25 and 26 of the guide 24.
  • the contact system shown also has a prestressed spring arrangement 27 which contains two pots 28 and 29 which can be displaced telescopically relative to one another, between which a compression spring 30 is arranged.
  • the spring arrangement 27 is rotatably supported at one end about an axis 31 which passes through the housing part 21 transversely; at its other end, the spring arrangement 27 engages a roller 32 which runs in the guide 24 of the rotatable contact part 23 transversely to its axis of rotation 22.
  • the roller 32 When the contact is closed, the roller 32 lies on the first stop 25, the line of action 33 of the force of the spring arrangement 27 and the guide 24 enclosing an angle 34 which is slightly less than 90 °.
  • the roller 32 transmits the spring force of the spring arrangement 24 to the rotatable contact part 23 and presses it against the fixed contact part 20 with a predetermined contact pressure.
  • the rotatable contact part 23 In the event of an overcurrent, the rotatable contact part 23 is thereby occurring electro-dynamic forces moved away from the fixed contact part 20, wherein the angle between the direction of the force applied by the spring arrangement 27 and the guide 24 increases. As soon as this angle is greater than 90 °, the compression spring 30 of the spring arrangement 27 can relax suddenly, the roller 32 being moved along the guide 24 up to the second stop 26.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Contacts (AREA)
  • Mechanisms For Operating Contacts (AREA)

Abstract

Ein elektro-dynamisch öffnendes Kontaktsystem weist ein feststehendes Kontaktteil (1) und ein um eine Drehachse (4) drehbar angeordnetes Kontaktteil (2) auf. Das Kontaktsystem enthält ferner eine vorgespannte Federanordnung (5), die an ihrem einen Ende ortsfest gehalten ist und an ihrem anderen Ende (6b bzw. 7b) derart an dem drehbaren Kontaktteil (2) angreift, daß die Federanordnung (5) bei geschlossenem Kontakt einen Kontaktdruck bewirkt und bei geöffnetem Kontakt ein diesen geöffnet haltendes Drehmoment erzeugt. Damit das Kontaktsystem in geschlossenem Zustand eine ausreichend hohe Kontaktkraft aufbringt und beim Auftreten eines Überstroms besonders schnell und sicher öffnet, weist das drehbare Kontaktteil (2) eine quer zu seiner Drehachse (4) verlaufende Führung (10) auf, wobei die Federanordnung (5) so ausgerichtet ist, daß bei geschlossenem Kontakt ihre Wirkungslinie etwa im rechten Winkel zu der Führung (10) verläuft; das andere Ende (6b bzw. 7b) der Federanordnung (5) ist dabei entlang dieser Führung (10) verschiebbar gelagert.An electro-dynamically opening contact system has a fixed contact part (1) and a contact part (2) which is rotatable about an axis of rotation (4). The contact system also contains a prestressed spring arrangement (5) which is held stationary at one end and engages the rotatable contact part (2) at its other end (6b or 7b) in such a way that the spring arrangement (5) unites when the contact is closed Contact pressure causes and when the contact is open generates a torque that keeps it open. So that the contact system exerts a sufficiently high contact force in the closed state and opens particularly quickly and safely when an overcurrent occurs, the rotatable contact part (2) has a guide (10) running transversely to its axis of rotation (4), the spring arrangement (5) is aligned so that when the contact is closed, its line of action is approximately at right angles to the guide (10); the other end (6b or 7b) of the spring arrangement (5) is slidably mounted along this guide (10).

Description

Die Erfindung betrifft einen elektro-dynamisch öffnendes Kontaktsystem mit einem feststehenden Kontaktteil und einem um eine Drehachse drehbar angeordneten Kontaktteil sowie mit einer vorgespannten Federanordnung, die an ihrem einen Ende ortsfest gehalten ist und an ihrem anderen Ende derart an dem drehbaren Kontaktteil angreift, daß die Federanordnung bei geschlossenem Kontakt einen'Kontaktdruck bewirkt und bei geöffnetem Kontakt ein diesen geöffnet haltendes Drehmoment erzeugt.The invention relates to an electro-dynamically opening contact system with a fixed contact part and a contact part rotatably arranged about an axis of rotation, and with a prestressed spring arrangement which is held stationary at one end and engages the rotatable contact part at its other end in such a way that the spring arrangement causes a contact pressure when the contact is closed and generates a torque when the contact is open.

Ein derartiges, aus der DE-PS 1 079 176 bekanntes elektro-dynamisch öffnendes Kontaktsystem weist eine Federanordnung mit zwei parallel angeordneten vorgespannten Zugfedern auf. Diese sind an ihrem jeweils einen Ende ortsfest gehalten und an ihrem jeweils anderen Ende an einem das drehbare Kontaktteil quer durchdringenden Bolzen eingehängt. Bei geschlossenem Kontakt erzeugen die beiden Zugfedern über das drehbare Kontaktteil eine Kontaktkraft. Sobald ein Überstrom durch das geschlossene Kontaktsystem fließt, wird das drehbar Kontakteil durch elektro-dynamische Krafteinwirkung entgegen dervon der Federanordnung aufgebrachten Kontaktkraft von dem feststehenden Kontaktteil weggeschleudert. Bei einem vorgegebenen Öffnungswinkel zwischen dem feststehenden und dem drehbaren Kontaktteil dreht sich die Richtung des von der Federanordnung auf das drehbare Kontaktteil ausgeübten Drehmoments um, so daß die Federanordnung nunmehr die weitere Öffnung des Kontaktes beschleunigt.Such an electro-dynamically opening contact system, known from DE-PS 1 079 176, has a spring arrangement with two prestressed tension springs arranged in parallel. These are held stationary at their respective ends and are suspended at their respective other ends on a bolt which penetrates the rotatable contact part transversely. When the contact is closed, the two tension springs generate a contact force via the rotatable contact part. As soon as an overcurrent flows through the closed contact system, the rotatable contact part is thrown away from the fixed contact part by the action of electro-dynamic force against the contact force applied by the spring arrangement. With a predetermined opening angle between the fixed and the rotatable contact part, the direction of the torque exerted by the spring arrangement on the rotatable contact part reverses, so that the spring arrangement now accelerates the further opening of the contact.

Der Erfindung liegt die Aufgabe zugrunde, einen elektro-dynamisch öffnendes Kontaktsystem anzugeben, das in geschlossenem Zustand eine verhältnismäßig hohe Kontaktkraft aufweist und beim Auftreten eines Überstromes besonders schnell und sicher öffnet.The invention has for its object to provide an electro-dynamically opening contact system which has a relatively high contact force in the closed state and opens particularly quickly and safely when an overcurrent occurs.

Die erfindungsgemäße Lösung dieser Aufgabe besteht darin, daß bei dem eingangs erwähnten Kontaktsystem das drehbare Kontaktteil eine quer zu seiner Drehachse verlaufende Führung aufueist, daß die Federanordnung so ausgerichtet ist, daß bei geschlossenem Kontakt ihre Wirkungslinie etwa im rechten Winkel zu der Führung verläuft und daß das andere Ende der Federanordnung entlang dieser Führung verschiebbar gelagert ist.The solution to this problem according to the invention is that in the contact system mentioned above, the rotatable contact part has a guide extending transversely to its axis of rotation, that the spring arrangement is oriented so that when the contact is closed, its line of action runs approximately at right angles to the guide and that other end of the spring arrangement is slidably mounted along this guide.

Ein wesentlicher Vorteil des erfindungsgemäßen Kontaktsystems besteht darin, daß bei geschlossenem Kontakt wegen der ungefähr senkrechten Einwirkung der Federkraft auf die Führung des beweglichen Kontaktteiles die zur Erzeugung des Kontraktdruckes wirksame Kraftkomponente der Federanordnung und damit die Kontaktkraft besonders groß ist. Ein weiterer Vorteil des erfindungsgemäßen Kontaktsystems ergibt sich aus der verschiebbaren Anordnung des Angriffspunktes der Federanordnung an dem drehbaren Kontaktteil, weil dadurch die Federanordnung im Überstromfall schon nach geringer Öffnung des Kontaktes durch elektro- dynamische Kräfte die weitere Öffnung des Kontaktes beschleunigt. Sobald nämlich ein Überstrom durch den geschlossenen Kontakt fließt und infolge elektro-dynamischer Krafteinuirkung'ein Abheben des drehbaren Kontaktteils von dem feststehenden Kontaktteil beuirkt, wird das andere Ende der Federanordnung entlang der Führung kontinuierlich in Abhängigkeit von dem Öffnungswinkel zwischen dem drehbaren und dem feststehenden Kontaktteil in jeweils derartige neue Lagen beuegt, in denen die von der Federanordnung aufgebrachte Kraft den jeweils geringstmöglichen Wert annimmt. Daher wird schon bei kleinem Öffnungswinkel eine Stellung der Federanordnung erreicht, bei der das auf das drehbare Kontaktteil Wirkende Drehmoment seine Richtung umkehrt und so eine weitere Öffnung des Kontaktes bewirkt.A major advantage of the contact system according to the invention is that when the contact is closed, because of the approximately vertical action of the spring force on the guide of the movable contact part, the force component of the spring arrangement effective for generating the contract pressure and thus the contact force is particularly large. Another advantage of the contact system according to the invention results from the displaceable arrangement of the point of application of the spring arrangement on the rotatable contact part, because in the event of an overcurrent the spring arrangement accelerates the further opening of the contact even after the contact has opened only slightly by means of electro-dynamic forces. Namely, once an overcurrent flows through the closed contact and beuirkt due to electro-dynamic Krafteinuirkung 'lifting of the rotary contact part of the fixed contact portion, the other end of the spring assembly along the guide is continuously in dependence upon the opening angle between the rotatable and the fixed contact part in in each case such new layers are flexed in which the force applied by the spring arrangement is the lowest possible in each case Assumes value. Therefore, even at a small opening angle, a position of the spring arrangement is reached in which the torque acting on the rotatable contact part reverses its direction and thus causes the contact to open further.

Die Führung kann eine derartige Kontur auf weisen, daß das von der Federanordnung auf das bewegliche Kontaktteil ausgeübte Drehmoment während der Öffnung des Kontaktes in Abhängigkeit vom Öffnungsuinkel im Hinblick auf eine höhere Öffnungsgeschwindigkeit optimale Werte annimmt.The guide can have such a contour that the torque exerted by the spring arrangement on the movable contact part during the opening of the contact takes on optimal values depending on the opening angle with regard to a higher opening speed.

Bei einer vorteilhaften Ausführungsform des erfindungsgemäßen Kontaktsystems Weist die Federanordnung an ihrem einen Ende eine Rolle auf, die entlang der Führung läuft. Dadurch Wird erreicht, daß sich das andere Ende der Federanordnung während der Öffnung des Kontaktes besonders reibungsarm entlang der Führung des drehbaren Kontaktteiles bewegt, so daß der Öffnungsvorgang besonders schnell und sicher erfolgt.In an advantageous embodiment of the contact system according to the invention, the spring arrangement has a roller at one end which runs along the guide. It is thereby achieved that the other end of the spring arrangement moves with particularly little friction along the guide of the rotatable contact part during the opening of the contact, so that the opening process takes place particularly quickly and safely.

Bei einer weiteren vorteilhaften Ausführungsform des erfindungsgemäßen Kontaktsystems weist die Führung zwei Anschläge für die Endlagen des anderen Endes der Federanordnung auf. .Durch diese Anschläge wird erreicht, daß sowohl beim Öffnen als auch beim Schließen des Kontaktes das andere Ende der Federanordnung in der Führung gegen den jeweiligen Anschlag .bewegt wird, so daß das drehbare Kontaktteil nach Beendigung des Öffnungs- bzu. Schließvorganges keine Schwingungsbewegungen ausführen kann. Auf diese Weise wird verhindert, daß bei Betätigung des Kontaktsystems Prellerscheinungen auftreten.In a further advantageous embodiment of the contact system according to the invention, the guide has two stops for the end positions of the other end of the spring arrangement. These stops ensure that the other end of the spring arrangement is moved in the guide against the respective stop both when opening and when closing the contact, so that the rotatable contact part bzu after completion of the opening. Closing process can not perform any vibratory movements. In this way, bouncing phenomena are prevented when the contact system is actuated.

Ein besonders einfacher Aufbau des erfindungsgemäßen Kontaktsystems wird dadurch erreicht, daß die Führung von einer Ausnehmung in dem drehbar angeordneten Kontaktteil gebildet ist und daß die Enden der Ausnehmung die Anschläge der Führung darstellen.A particularly simple construction of the contact system according to the invention is achieved in that the guide is formed by a recess in the rotatably arranged contact part is and that the ends of the recess represent the stops of the guide.

Ein besonders kompakter Aufbau des erfindungsgemäßen Kontaktsystems läßt sich dadurch erzielen, daß die Federanordnung aus zwei Zugfedern besteht, die beiderseits des drehbaren Kontaktteiles angeordnet sind.A particularly compact structure of the contact system according to the invention can be achieved in that the spring arrangement consists of two tension springs which are arranged on both sides of the rotatable contact part.

Zur Erläuterung der Erfindung ist in

  • Figur 1 eine Seitenansicht eines Ausführungsbeispiels des erfindungsgemäßen Kontaktsystems mit Zugfeder bei geschlossenem Kontakt dargestellt;
  • Figur 2 zeigt das Kontaktsystem nach Figur 1 bei geöffnetem Kontakt und
  • Figur 3 eine Draufsicht auf das Kontaktsystem nach Figur 1. In
  • Figur 4 ist eine Seitenansicht eines Ausführungsbeispiels des erfindungsgemäßen Kontaktsystems mit einer Druckfeder bei geschlossenem Kontakt dargestellt und Figur
  • 5 zeigt eine weitere Ansicht des Kontaktsystems nach Figur 4 bei geöffnetem Kontakt.
To explain the invention is in
  • Figure 1 shows a side view of an embodiment of the contact system according to the invention with tension spring with closed contact;
  • Figure 2 shows the contact system of Figure 1 with the contact open and
  • Figure 3 is a plan view of the contact system of Figure 1. In
  • FIG. 4 shows a side view of an exemplary embodiment of the contact system according to the invention with a compression spring when the contact is closed, and FIG
  • 5 shows a further view of the contact system according to FIG. 4 with the contact open.

Das in den Figuren 1 bis 3 dargestellte Kontaktsystem weist ein U-förmig-abgewinkeltes feststehendes Kontaktteil 1 und ein weiteres drehbares Kontaktteil 2 auf, das in einem Gehäuseteil 3 oder einem Schaltuellenteil des Selbstschalters um eine Drehachse 4 gelagert ist. Das Kontaktsystem enthält weiterhin eine Federanordnung 5, bestehend aus zwei vorgespannten Zugfedern 6 und 7, die parallel zueinander beiderseits des drehbaren Kontaktteiles 2 angeordnet sind. Die beiden Zugfedern 6 und 7 sind an jeweils einem Ende 6a ortsfest an einem das Gehäuse 3 quer durchdringenden Bolzen 8 eingehängt. An ihrem jeweils anderen Ende 6b bzu. 7b greifen die beiden Zugfedern 6 und 7 an der Achse einer Rolle 9 an, die in einer Führung 10 des drehbaren Kontaktteiles 2 quer zu dessen Drehachse 4 läuft. Die Führung 10 ist von einer Ausnehmung in dem drehbaren Kontaktteil 2 gebildet, wobei die Enden der Ausnehmung zwei Anschläge 11 und 12 für die Endlagen des anderen Endes 6b bzu. 7b der Federanordnung 5 mit der Rolle 9 bilden.The contact system shown in Figures 1 to 3 has a U-shaped angled fixed contact part 1 and a further rotatable contact part 2, which is mounted in a housing part 3 or a switch part of the circuit breaker about an axis of rotation 4. The contact system further contains a spring arrangement 5, consisting of two prestressed tension springs 6 and 7, which are arranged parallel to each other on both sides of the rotatable contact part 2. The two tension springs 6 and 7 are each fixed at one end 6a to a bolt 8 which penetrates the housing 3 transversely. At their other end 6b bzu. 7b engage the two tension springs 6 and 7 on the axis of a roller 9, which transversely in a guide 10 of the rotatable contact part 2 to the axis of rotation 4 runs. The guide 10 is formed by a recess in the rotatable contact part 2, the ends of the recess having two stops 11 and 12 for the end positions of the other end 6b. 7b form the spring arrangement 5 with the roller 9.

Bei geschlossenem Kontakt liegt die Rolle 9 in der Führung 10 an dem Anschlag 11 und überträgt die Federkraft der Federanordnung derart auf das bewegliche Kontaktteil 2, daß dieses mit einem vorgegebenen Kontaktdruck gegen das feststehende Kontaktteil 1 gedrückt wird. Dabei liegen das drehbare Kontaktteil 2 und ein Schenkel des U-förmigen feststehenden Kontaktteiles 1 parallel zueinander und bilden eine Stromschleife. Sobald der Strom in dieser Stromschleife einen vorgegebenen Wert überschreitet, wirken auf das drehbare Kontaktteil 2 dem Kontaktdruck bzw. der Kraft der Federanordnung 5 entgegenwirkende elektro-dynamische Kräfte, die das drehbare Kontaktteil 2 von dem feststehenden Kontaktteil 1 abheben. Dabei bewegt sich die Rolle 9 in der Führung 10 aus ihrer Lage an dem Anschlag 11 in Richtung auf den Anschlag 12. Die jeweilige Lage der Rolle 9 in Abhängigkeit von dem Öffnungswinkel zwischen dem feststehenden Kontaktteil und dem drehenden Kontaktteil 2 ist dadurch bestimmt, daß die Federanordnung 5 bestrebt ist,'die jeweils geringstmögliche Federkraft aufzubringen, so daß die Wirkungslinie der von der Federanordnung 5 aufgebrachten Federkraft stets senkrecht zu der Richtung der Bewegungsfreiheit der Rolle 9 in der Führung 10 verläuft. Bei einem vorgegebenen Öffnungswinkel zwischen den Kontaktteilen 1 und 2 bewegt sich die Wirkungslinie der Federkraft durch die Drehachse 4 des drehbaren Kontaktteils 2, wobei das von der Federanordnung 5 auf das drehbare Kontaktteil 2 ausgeübte Drehmoment seine Richtung umkehrt. Im folgenden bewirkt daher die Federanordnung 5 mit ihrer Federkraft eine weitere Öffnung des Kontaktes, bis das bewegliche Kontaktteil 2 gegen eine Anschlagvorrichtung 13 schlägt. Bei dieser in Figur 2 dargestellten Stellung der Kontaktteile 1 und 2 liegt die Rolle 9 an dem zweiten Anschlag 12 der Führung 10, wobei die Federanordnung 5 über die Rolle 9 ein den Kontakt geöffnet haltendes Drehmoment auf das drehbare Kontaktteil 2 ausübt. Bei einer Rückstellung des drehbaren Kontaktteils in die in Figur 1 dargestellte Position wird die Rolle 9 entlang der Führung 10 wieder in ihre Ausgangslage an dem Anschlag 11 zurückbeuegt.When the contact is closed, the roller 9 lies in the guide 10 on the stop 11 and transmits the spring force of the spring arrangement to the movable contact part 2 such that it is pressed against the fixed contact part 1 with a predetermined contact pressure. The rotatable contact part 2 and one leg of the U-shaped fixed contact part 1 are parallel to one another and form a current loop. As soon as the current in this current loop exceeds a predetermined value, electro-dynamic forces acting on the rotatable contact part 2 counteracting the contact pressure or the force of the spring arrangement 5, which lift the rotatable contact part 2 from the fixed contact part 1. The roller 9 moves in the guide 10 from its position on the stop 11 in the direction of the stop 12. The respective position of the roller 9 as a function of the opening angle between the fixed contact part and the rotating contact part 2 is determined in that the Spring arrangement 5 strives to apply the lowest possible spring force, so that the line of action of the spring force applied by spring arrangement 5 always runs perpendicular to the direction of freedom of movement of roller 9 in guide 10. At a predetermined opening angle between the contact parts 1 and 2, the line of action of the spring force moves through the axis of rotation 4 of the rotatable contact part 2, the torque exerted by the spring arrangement 5 on the rotatable contact part 2 reversing its direction. In the following, therefore, the spring arrangement 5 causes a further opening of the contact with its spring force until the movable con Clock part 2 strikes against a stop device 13. In this position of the contact parts 1 and 2 shown in FIG. 2, the roller 9 lies on the second stop 12 of the guide 10, the spring arrangement 5 exerting a torque which keeps the contact open on the rotatable contact part 2 via the roller 9. When the rotatable contact part is returned to the position shown in FIG. 1, the roller 9 is moved back along the guide 10 into its starting position at the stop 11.

Das in den Figuren 4 und 5 dargestellte Ausführungsbeispiel des erfindungsgemäßen Kontaktsystems weist ebenso wie das zuvor beschriebene Ausführungsbeispiel ein feststehendes Kontaktteil 20 und ein in einem Gehäuseteil 21 oder in einem Schaltwellenteil um eine Drehachse 22 drehbares Kontaktteil 23 auf. Das drehbare Kontaktteil 23 enthält eine Ausnehmung, die eine Führung 24 darstellt und deren Enden zwei Anschläge 25 und 26 der Führung 24 bilden. Das dargestellte Kontaktsystem weist ferner eine vorgespannte Federanordnung 27 auf, die zwei teleskopartig gegeneinander verschiebbare Töpfe 28 und 29 enthält, zwischen denen eine Druckfeder 30 angeordnet ist. Die Federanordnung 27 ist an ihrem einen Ende um eine das Gehäuseteil.21 quer durchsetzende Achse 31 drehbar gelagert; an ihrem anderen Ende greift.die Federanordnung 27 an einer Rolle 32 an, die in der Führung 24 des drehbaren Kontaktteiles 23 quer zu dessen Drehachse 22 läuft.The exemplary embodiment of the contact system according to the invention shown in FIGS. 4 and 5, like the exemplary embodiment described above, has a fixed contact part 20 and a contact part 23 which can be rotated about an axis of rotation 22 in a housing part 21 or in a switching shaft part. The rotatable contact part 23 contains a recess which represents a guide 24 and the ends of which form two stops 25 and 26 of the guide 24. The contact system shown also has a prestressed spring arrangement 27 which contains two pots 28 and 29 which can be displaced telescopically relative to one another, between which a compression spring 30 is arranged. The spring arrangement 27 is rotatably supported at one end about an axis 31 which passes through the housing part 21 transversely; at its other end, the spring arrangement 27 engages a roller 32 which runs in the guide 24 of the rotatable contact part 23 transversely to its axis of rotation 22.

Bei geschlossenem Kontakt liegt die Rolle 32 an dem ersten Anschlag 25, wobei die Wirkungslinie 33 der Kraft der Federanordnung 27 und die Führung 24 einen Winkel 34 einschließen, der geringfügig kleiner als 90° ist. Dabei überträgt die Rolle 32 die Federkraft der Federanordnung 24 auf das drehbare Kontaktteil 23 und drückt dieses mit einem vorgegebenen Kontaktdruck gegen das feststehende Kontaktteil 20. Im Überstromfall wird das drehbare Kontaktteil 23 durch die dabei auftretenden elektro-dynamischen Kräfte von dem feststehenden Kontaktteil 20 wegbewegt, wobei sich der Winkel zwischen der Richtung der von der Federanordnung 27 aufgebrachten Kraft und der Führung 24 vergrößert. Sobald dieser Winkel größer als 90° uird, kann sich die Druckfeder 30 der Federanordnung 27 ruckartig entspannen, wobei die Rolle 32 entlang der Führung 24 bis zu dem zweiten Anschlag 26 bewegt uird. Sobald die Rolle 32 gegen den zweiten Anschlag 26 gelaufen ist, wird die von der Federanordnung 27 erzeugte Federkraft wieder über die Rolle 32 auf das drehbare Kontaktteil 23 übertragen. Dabei wirkt das auf das drehbare Kontaktteil 23 ausgeübte Drehmoment bedingt durch die Lage der Rolle 32 an dem Anschlag 26 in Richtung einer weiteren Öffnung des Kontaktes, bis das drehbare Kontaktteil 23 gegen eine Anschlagvorrichtung 35 schlägt (Figur 5).When the contact is closed, the roller 32 lies on the first stop 25, the line of action 33 of the force of the spring arrangement 27 and the guide 24 enclosing an angle 34 which is slightly less than 90 °. The roller 32 transmits the spring force of the spring arrangement 24 to the rotatable contact part 23 and presses it against the fixed contact part 20 with a predetermined contact pressure. In the event of an overcurrent, the rotatable contact part 23 is thereby occurring electro-dynamic forces moved away from the fixed contact part 20, wherein the angle between the direction of the force applied by the spring arrangement 27 and the guide 24 increases. As soon as this angle is greater than 90 °, the compression spring 30 of the spring arrangement 27 can relax suddenly, the roller 32 being moved along the guide 24 up to the second stop 26. As soon as the roller 32 has run against the second stop 26, the spring force generated by the spring arrangement 27 is again transmitted via the roller 32 to the rotatable contact part 23. The torque exerted on the rotatable contact part 23 acts due to the position of the roller 32 on the stop 26 in the direction of a further opening of the contact until the rotatable contact part 23 strikes a stop device 35 (FIG. 5).

Claims (5)

1. Elektro-dynamisch öffnendes Kontaktsystem mit einem feststehenden Kontaktteil und einem um eine Drehachse drehbar angeordneten Kontaktteil sowie mit einer vorgespannten Federanordnung, die an ihrem einen Ende ortsfest gehalten ist und an ihrem anderen Ende derart an dem drehbaren Kontaktteil angreift, daß die Federanordnung bei geschlossenem Kontakt einen Kontaktdruck bewirkt und bei geöffnetem Kontakt ein diesen geöffnet haltendes Drehmoment erzeugt , dadurch gekennzeichnet , daß das drehbare Kontaktteil (2) eine quer zu seiner Drehachse (4) verlaufende Führung (10) aufueist, daß die Federanordnung (5) so ausgerichtet ist, daß bei geschlossenem Kontakt ihre Wirkungslinie etwa im rechten Winkel zu der Führung (10) verläuft und daß das andere Ende (6b bzw. 7b) der Federanordnung (5) entlang dieser Führung (1D) verschiebbar gelagert ist.1. Electro-dynamically opening contact system with a fixed contact part and a contact part rotatably arranged about an axis of rotation and with a pretensioned spring arrangement which is held stationary at one end and engages at the other end on the rotatable contact part such that the spring arrangement when closed Contact causes a contact pressure and, when the contact is open, generates a torque which keeps it open, characterized in that the rotatable contact part (2) has a guide (10) running transversely to its axis of rotation (4) such that the spring arrangement (5) is oriented such that that when the contact is closed, its line of action runs approximately at right angles to the guide (10) and that the other end (6b or 7b) of the spring arrangement (5) is slidably mounted along this guide (1D). 2. Elektro-dynamisch öffnendes Kontaktsystem nach Anspruch 1, dadurch gekennzeichnet , daß die Federanordnung (5) an ihrem anderen Ende (6b bzu. 7b) eine Rolle (9) aufweist, die entlang der Führung (10) läuft.2. Electro-dynamically opening contact system according to claim 1, characterized in that the spring arrangement (5) at its other end (6b bzu. 7b) has a roller (9) which runs along the guide (10). 3. Elektro-dynamisch öffnendes Kontaktsystem nach einem der Ansprüche 1 oder 2 , dadurch gekennzeichnet, daß die Führung (10) zwei Anschläge (11 und 12) für die Endlägen des anderen Endes (6b bzw. 7b) der Federanordnung (5) aufweist.3. Electro-dynamically opening contact system according to one of claims 1 or 2, characterized in that the guide (10) has two stops (11 and 12) for the end positions of the other end (6b and 7b) of the spring arrangement (5). 4. Elektro-dynamisch öffnender Selbstschalter nach Anspruch 3, dadurch gekennzeichnet , daß die Führung (10) von einer Ausnehmung in dem drehbaren Kontaktteil (2) gebildet ist und daß die Enden der Ausnehmung die Anschläge (11 und 12) darstellen.4. Electro-dynamically opening auto switch according to claim 3, characterized in that the guide (10) is formed by a recess in the rotatable contact part (2) and that the ends of the recess represent the stops (11 and 12). 5. Elektro-dynamisch öffnendes Kontaktsystem nach einem der vorangehenden Ansprüche , dadurch gekennzeichnet, daß die Federanordnung (5) aus zwei Zugfedern (6 und 7) besteht, die beiderseits des drehbaren Kontaktteiles (2) angeordnet sind.5. Electro-dynamically opening contact system according to one of the preceding claims, characterized in that the spring arrangement (5) consists of two tension springs (6 and 7) which are arranged on both sides of the rotatable contact part (2).
EP84730132A 1983-12-22 1984-12-04 Contact system with an electrodynamic opening Expired EP0148111B1 (en)

Applications Claiming Priority (2)

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DE3347120 1983-12-22
DE19833347120 DE3347120A1 (en) 1983-12-22 1983-12-22 ELECTRO-DYNAMIC OPENING CONTACT SYSTEM

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EP0148111A2 true EP0148111A2 (en) 1985-07-10
EP0148111A3 EP0148111A3 (en) 1985-08-07
EP0148111B1 EP0148111B1 (en) 1987-03-04

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EP (1) EP0148111B1 (en)
JP (1) JPS60157115A (en)
DE (2) DE3347120A1 (en)

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Publication number Priority date Publication date Assignee Title
DE3708807A1 (en) * 1987-03-18 1988-10-06 Licentia Gmbh ELECTRICAL CIRCUIT BREAKER WITH AN ELECTRO-DYNAMIC OPENING CONTACT SYSTEM
US4841266A (en) * 1987-03-18 1989-06-20 Licentia Patent-Verwaltungs-Gmbh Circuit breaker having an electrodynamically opening contact system

Also Published As

Publication number Publication date
DE3462563D1 (en) 1987-04-09
EP0148111B1 (en) 1987-03-04
US4562419A (en) 1985-12-31
EP0148111A3 (en) 1985-08-07
DE3347120A1 (en) 1985-07-11
JPH0151845B2 (en) 1989-11-07
JPS60157115A (en) 1985-08-17

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