EP1420432B1 - Contact system for a low voltage switch - Google Patents

Contact system for a low voltage switch Download PDF

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Publication number
EP1420432B1
EP1420432B1 EP03023418A EP03023418A EP1420432B1 EP 1420432 B1 EP1420432 B1 EP 1420432B1 EP 03023418 A EP03023418 A EP 03023418A EP 03023418 A EP03023418 A EP 03023418A EP 1420432 B1 EP1420432 B1 EP 1420432B1
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EP
European Patent Office
Prior art keywords
stop
contact
switch piece
switch
contact system
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 - Lifetime
Application number
EP03023418A
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German (de)
French (fr)
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EP1420432A2 (en
EP1420432A3 (en
Inventor
Volker Heins
Axel Britz
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Eaton Industries GmbH
Original Assignee
Moeller GmbH
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Publication date
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Publication of EP1420432A2 publication Critical patent/EP1420432A2/en
Publication of EP1420432A3 publication Critical patent/EP1420432A3/en
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Publication of EP1420432B1 publication Critical patent/EP1420432B1/en
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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H1/225—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member the supporting member being pivotable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Definitions

  • the invention relates to a contact system for a low-voltage switch, in particular for a circuit breaker.
  • a contact system in which three single-arm contact arm are acted upon by contact force springs.
  • two limiting elements in the upper part of the housing and for the middle contact a limiting element is provided, which serve as stops of the contact arm at the end of the opening movement.
  • the housing is especially reinforced for absorbing and absorbing the kinetic energy when opening the contacts.
  • the limiting elements are formed of shock-absorbing material.
  • a generic contact system is from the DE 3411275 C2 known.
  • a second stop for the contact arm is available. This stop has a function in connection with an enlarged bearing opening for a provided as a rotation axis of the contact arm pivot pin.
  • the enlarged bearing opening allows, in particular in the last phase of the closing of the contact, a change in position of the contact arm such that the movable contact on the fixed contact performs a grinding movement, whereby the burning or welding of the contacts is prevented.
  • a second stop which is in a sense upstream of a single stop and during the movement of the contact piece by the electrodynamic opening force kinetic energy can be absorbed by the contact force spring after hitting the first stop.
  • the switching piece Since the switching piece is mounted floating, the excess energy still present causes the further rotation of the contact piece to the fulcrum of the previously met attack.
  • the contact piece performs a translational movement in the slot, connected to the compression of the compression spring. It then comes to the touch and the impact of the other arm portion on the other stop in the housing or in a housing part, with a final remainder of kinetic energy is consumed.
  • both stops are reached one after the other.
  • the additionally introduced stop lies with respect to the angular travel, preferably in front of an otherwise usually used single stop or as in the US 5,258,733 used double stop.
  • the selector shaft and its bearing also absorb a residual amount of deformation energy.
  • the length of the slot can be selected so that after touching the second stop and the then continuing rotation of the bearing pin abuts the end of the slot before the first stop is reached. When hitting the end of the slot, the shift shaft and its bearing is loaded and energy is dissipated in the stem and in their camp.
  • the two arm sections should preferably not be punctiform. However, the areas of the two arm sections can be chosen small.
  • the dimension of the contact piece (in particular its thickness) need not be particularly changed or adapted; it can be dispensed with in the invention to broadening and extensions of the surfaces of the two stops and the two arm portions.
  • the choice of material for the stop should preferably be directed specifically to impact-resistant plastics, with the person skilled in the art suitable marketable materials are available.
  • the housing may preferably be formed of a plurality of chambers, wherein an upper chamber containing the first stop and a lower chamber containing the second stop.
  • the chambers are designed to be modular with the remaining parts of the contact system and the housing, which aid in ease of manufacture and assembly and allow expansion to contact system with other performance areas in a simple manner.
  • the switching piece can be designed with one arm or two arms. In each case one of these two embodiments, the point of attack and the direction of attack of the contact force spring can be set up for the specific case.
  • the contact force spring can act as a tension or compression spring.
  • each of the two switching piece sections should be arranged on the contact bearing bearing arm of the switching piece.
  • a one-armed contact piece is used.
  • the switching piece may also be formed with two arms, in which case a switching piece section is arranged on each arm of the switching piece.
  • the contact bearing bearing arm of the contact piece may be formed longer than the contact remote arm of the contact piece.
  • Fig. 1 the contact system of a low-voltage circuit breaker is shown with tilt-point-mounted, two-armed contact piece when hitting the second stop 34 during the opening movement.
  • Fig. 2 the impact on the first stop 24 and the remaining contact on the second stop 34 can be seen.
  • Fig. 3 shows three parallel contact systems, which are connected via the switching shaft. This is a preferred embodiment in which the bearing of the contact piece is eccentric in or on the shift shaft. As an alternative is claimed - but not shown in the figures, that the contact piece is mounted on a slot in the housing or in a housing part.
  • the dynamic ratios addressed in the invention are the same in both arrangements. The essential point is that during the opening movement of the contact piece, the slot remains stationary.
  • the current path of the contact is not shown.
  • the current path is opened and closed by the simply interrupting contact piece (as a rotary contact).
  • the contact piece 10 is rotatable about the axis of rotation between its closed and open position.
  • the contact piece has a longer 18 and a shorter arm 20.
  • the longer arm 18 carries a contact pad not shown in detail for contacting the fixed contact.
  • the rated current flows through the circuit path, wherein it passes through a bus bar, flows through the contact, the contact piece and the fixed contact and leaves the housing via a second bus bar with terminal lug.
  • the busbars are designed as a current loop to the electrodynamic effect to achieve a fast switch opening.
  • Reference numeral 70 indicates a quenching chamber.
  • the bearing of the contact piece 10 takes place in a slot 27 floating on a bearing pin 15 which has coaxially directed to the side of the contact piece pivot.
  • the bearing pin forms the axis of rotation during the opening movement.
  • Bearing pin and selector shaft are parallel to each other.
  • the contact piece according to FIG. 1 is tilt-point-mounted. Depending on the rotational position with respect to the dead center of the bearing, the switching piece jumps supported by the force of the contact force spring in the open or in the closed position. Holding and guiding the switching piece 10 is done by the contact force spring 40.
  • the contact force spring 40 is fixed at one end to a counter-bearing 52 in the housing 100.
  • the contact force spring loaded via a spring plunger 42, the contact piece 10 at a bearing point 17 in the direction of the bearing point in the housing.
  • the bearing 17 is formed as a semicircular groove.
  • the contact piece section 22 abuts the long lever arm 18 at the end of the opening movement to only one stop, which corresponds approximately to the stop with reference numeral 24 in the figures.
  • a second stop 34 and, on the short lever arm 20, an associated section 32 are formed in the lower part of the housing 100 - here in a housing partial chamber 104.
  • the section 32 suggests after opening the contact system before any other contact of the switching arm with housing parts on the second stop 34.
  • the contact of the first portion 22 with the first stop 24 takes place later.
  • Both sections are preferably flat and not punctiform.
  • the contact area of the first portion 22 and the associated surface of the stop 24 is greater than the contact surface and abutment surface 34 of the second portion 32nd
  • the floating bearing of the contact piece and the longitudinal extension of the slot 27 in the contact piece is such that the longitudinal extent of the slot parallel to the main component of the movement B2 of the contact piece, while the pivot point is in the first hit stop 34.
  • the switching piece can move translationally in the slot, wherein the contact force spring 40 undergoes further compression (and thus spring work).
  • Reference numeral 36 denotes a first contact surface, which represents a mechanical load zone of the contact piece, the switching shaft and its bearing.
  • the mechanical load occurs by the rotational movement B2 about the given by the second stop 34 pivot point.
  • the rotation B2 is unhindered until the bearing pin 15 abuts the end of the slot when the length of the slot is selected to be correspondingly short.
  • the contact force spring 40 and its abutment 52 is loaded, whereby kinetic energy is consumed in the contact force spring and the bearing.
  • the shift shaft and its bearing After hitting the end of the slot, the shift shaft and its bearing is loaded; Energy is dissipated in the stem and in their bearings.
  • the resulting second contact surface (in this case a second mechanical stress zone) is labeled with the already mentioned reference numeral 36 '.
  • Fig. 3 shows three contact systems, with bearing housing 52 for the contact force spring 40 and the shift shaft 60. Above the contact piece 10, the bearing pin 15 can be seen, form the two ends of the pivot. The switching piece is mounted eccentrically to the switching shaft axis in the switching shaft 60 via the bearing pin.
  • the bearing in the middle bearing block 64 consists of a not visible in the figure slot.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Keying Circuit Devices (AREA)
  • Electronic Switches (AREA)

Abstract

The contact system has a switch piece (10) for each pole of the low voltage (LV) switch, supported in the switch housing via a floating bearing and acted on by a contact spring. The switch housing has a first stop cooperating with a first switch piece section at the end of the opening movement and a second stop cooperating with a second section of the switch piece, offset angularly from the first stop. A bearing pin (15) of the switch piece is supported within an elongate opening (27) for providing the floating bearing, the longitudinal direction of the opening extending parallel to the acting direction of the contact spring and allowing a rotation of the switch piece after abutting the second stop about a rotation point provided by the latter.

Description

Die Erfindung betrifft ein Kontaktsystem für einen Niederspannungsschalter, insbesondere für einen Leistungsschalter.The invention relates to a contact system for a low-voltage switch, in particular for a circuit breaker.

Aus der DE 39 01 852 A1 ist ein kipp-punkt-gelagertes Kontaktsystem für einen strombegrenzenden Leistungsschalter bekannt mit einem im Kurzschlussfall dynamisch öffnenden drehbeweglichen, ersten Kontaktarm. Dieser erste Kontaktarm wird von einer im Gehäuse abgestützten Druckfeder (Kontaktkraftfeder) über einen Druckbolzen beaufschlagt. Am Ende der Öffnungsbewegung läuft der Kontaktarm nach Überschreiten einer instabilen Stellung im oberen Teil des Gehäuses gegen ein Begrenzungselement, um in dieser zweiten Kipplage in eine sichere AUS-Lage zu gelangen. Die Bewegungsenergie wird vorrangig an dem als Anschlag wirkenden Begrenzungselement absorbiert, wodurch die Bewegung zum Stillstand kommt.From the DE 39 01 852 A1 is a tilt-point-mounted contact system for a current-limiting circuit breaker known with a dynamically opening in case of short-circuiting rotatable, first contact arm. This first contact arm is acted upon by a pressure spring supported in the housing (contact force spring) via a pressure pin. At the end of the opening movement of the contact arm runs after exceeding an unstable position in the upper part of the housing against a limiting element to get into this second tilting position in a safe OFF position. The kinetic energy is absorbed primarily on the limiting element acting as a stop, whereby the movement comes to a standstill.

In der US 5 258 733 ist ein Kontaktsystem beschrieben, in dem drei einarmige Kontaktarm von Kontaktkraftfedern beaufschlagt werden. Für die beiden außenliegenden Kontakte sind im oberen Teil des Gehäuses zwei Begrenzungselemente und für den mittleren Kontakt ist ein Begrenzungselement vorhanden, die als Anschläge des Kontaktarms am Ende der Öffnungsbewegung dienen. Das Gehäuse ist besonders zur Aufnahme und Absorption der Bewegungsenergie beim Öffnen der Kontakte verstärkt. Die Begrenzungselemente sind aus stoßdämpfendem Material ausgebildet.In the US 5,258,733 a contact system is described in which three single-arm contact arm are acted upon by contact force springs. For the two outer contacts, two limiting elements in the upper part of the housing and for the middle contact a limiting element is provided, which serve as stops of the contact arm at the end of the opening movement. The housing is especially reinforced for absorbing and absorbing the kinetic energy when opening the contacts. The limiting elements are formed of shock-absorbing material.

Der Nachteil solcher Anordnungen ist der besondere Aufwand in der Verstärkung des Gehäuses. Der Aufwand muss - auch in bezug auf die schlagbelasteten Teile des Kontaktsystems - noch erhöht werden, wenn leistungsstärkere Kontaktsysteme entwickelt werden sollen. Die Belastung der Schaltwelle und ihrer Lagerung bei Leistungsschaltern wird mit zunehmender Schaltleistung besonders kritisch.The disadvantage of such arrangements is the special effort in the reinforcement of the housing. The effort must be increased - also with regard to the shock-loaded parts of the contact system - if more powerful contact systems are to be developed. The burden of the switching shaft and its storage circuit breakers is particularly critical with increasing switching capacity.

Ein gattungsgemäßes Kontaktsystem ist aus der DE 3411275 C2 bekannt. Ein zweiter Anschlag für den Kontaktarm ist vorhanden. Dieser Anschlag hat eine Funktion in Zusammenhang mit einer vergrößerten Lageröffnung für einen als Drehachse des Kontaktarms vorgesehenen Schwenkstift. Die vergrößerte Lageröffnung erlaubt insbesondere in der letzten Phase des Schließvorgangs des Kontakt eine Lageveränderung des Kontaktarms derart, dass der bewegliche Kontakt auf dem Festkontakt eine Schleifbewegung vollführt, wodurch dem Einbrennen oder Verschweißen der Kontakte vorgebeugt wird. Bei der in der DE 3411275 C2 vorgegebenen Anordnung ist es nicht möglich, kinetische Energie aus der Öffnungsbewegung zu absorbieren oder in das Gehäuse abzuleiten.A generic contact system is from the DE 3411275 C2 known. A second stop for the contact arm is available. This stop has a function in connection with an enlarged bearing opening for a provided as a rotation axis of the contact arm pivot pin. The enlarged bearing opening allows, in particular in the last phase of the closing of the contact, a change in position of the contact arm such that the movable contact on the fixed contact performs a grinding movement, whereby the burning or welding of the contacts is prevented. When in the DE 3411275 C2 given arrangement, it is not possible to absorb kinetic energy from the opening movement or dissipate into the housing.

Es ist daher die Aufgabe der Erfindung, eine Anordnung anzugeben, bei der die Schlagbelastung durch die Aufschlagenergie an den Belastungsstellen im Kontaktsystem und in seinen Gehäuseteilen vermindert wird.It is therefore an object of the invention to provide an arrangement in which the impact load is reduced by the impact energy at the load points in the contact system and in its housing parts.

Die Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des unabhängigen Anspruches gelöst, während den abhängigen Ansprüchen vorteilhafte Weiterbildungen der Erfindung zu entnehmen sind.The object is achieved by the characterizing features of the independent claim, while the dependent claims advantageous developments of the invention can be found.

Kurz gefasst besteht die Erfindung darin, dass im Schaltergehäuse des Kontaktsystems ein zweiter Anschlag ausgebildet ist, der einem zweiten Abschnitt des Schaltstücks für den Aufschlag des zweiten Abschnitts zugeordnet ist;

  • beide Anschläge haben in Bezug auf die Öffnungsbewegung eine solche Winkelstellung zueinander, dass der zweite Abschnitt nach kürzerem Winkelweg als der erste Abschnitt auf den zweiten Anschlag trifft;
  • die schwimmende Lagerung erfolgt derart, dass am Schaltstück ein Lagerstift angeordnet ist, der spielbehaftet und zumindest während des dynamischen Öffnens unverschieblich in einem Langloch gelagert ist;
  • die Längserstreckung des Langlochs liegt parallel oder nahezu parallel zur Wirkrichtung der Kontaktkraftfeder;
  • die Länge des Langlochs erlaubt eine Drehung des Schaltstücks um einen im zweiten Anschlag liegenden Drehpunkt und
  • während der Drehung leistet die Kontaktkraftfeder Federarbeit (Kompressions- oder Dilatationsarbeit, je nach Wirkprinzip der Kontaktkraftfeder).
Briefly, the invention consists in that in the switch housing of the contact system, a second stop is formed, which is associated with a second portion of the contact piece for the impact of the second section;
  • both stops have such an angular position relative to one another with respect to the opening movement that the second section strikes the second stop after a shorter angular path than the first section;
  • the floating bearing takes place in such a way that a bearing pin is arranged on the contact piece, which is subject to play and, at least during the dynamic opening, is mounted non-displaceably in a slot;
  • the longitudinal extension of the slot is parallel or nearly parallel to the effective direction of the contact force spring;
  • the length of the slot allows rotation of the contact piece about a lying in the second stop pivot point and
  • During the rotation, the contact force spring performs spring work (compression or dilation work, depending on the operating principle of the contact force spring).

Es ist also ein zweiter Anschlag vorgesehen, der einem einzigen Anschlag gewissermaßen vorgelagert ist und während der Bewegung des Schaltstücks durch die elektrodynamische Öffnungskraft kann nach dem Auftreffen auf den ersten Anschlag von der Kontaktkraftfeder kinetische Energie absorbiert werden.It is therefore provided a second stop, which is in a sense upstream of a single stop and during the movement of the contact piece by the electrodynamic opening force kinetic energy can be absorbed by the contact force spring after hitting the first stop.

Damit sind weitere Dissipations- und Absorptionsstellen im Schaltergehäuse vorhanden, die zu einer Verringerung der Schlagbelastung der Belastungsstellen, insbesondere zu einer Entlastung der Schaltwelle führen.This further Dissipations- and absorption points are present in the switch housing, which lead to a reduction of the impact load of the load points, in particular to a relief of the shift shaft.

Da das Schaltstück schwimmend gelagert ist, bewirkt die noch vorhandene Überschussenergie die Weiterdrehung des Schaltstücks um den Drehpunkt des zeitlich zuvor getroffenen Anschlags. Das Schaltstück vollführt eine translatorische Bewegung im Langloch, verbunden mit der Kompression der Druckfeder. Es kommt dann zur Berührung und zum Auftreffen des anderen Armabschnitts auf den anderen Anschlag im Gehäuse oder in einem Gehäuseteil, wobei ein letzter Rest an Bewegungsenergie verbraucht wird.Since the switching piece is mounted floating, the excess energy still present causes the further rotation of the contact piece to the fulcrum of the previously met attack. The contact piece performs a translational movement in the slot, connected to the compression of the compression spring. It then comes to the touch and the impact of the other arm portion on the other stop in the housing or in a housing part, with a final remainder of kinetic energy is consumed.

Am Ende der Öffnungsbewegung werden beide Anschläge nacheinander erreicht. Der zusätzlich eingebrachte Anschlag liegt bezüglich des Winkelwegs vorzugsweise vor einem sonst üblicherweise eingesetzten einzigen Anschlag oder einem wie in der US 5 258 733 eingesetzten Doppelanschlag.At the end of the opening movement both stops are reached one after the other. The additionally introduced stop lies with respect to the angular travel, preferably in front of an otherwise usually used single stop or as in the US 5,258,733 used double stop.

Es werden weitere Ausgestaltungen vorgeschlagen:

  • Kontaktsystem wirkverbunden mit einem Schaltschloss, womit ein Unterbrechen des Stromflusses erfolgt, so dass auch nach Wieder-Schließen des Kontakts infolge der sinkenden Stromstärke kein erneuter Öffnungsvorgang eingeleitet wird.
  • Kontaktsystem mit einem Kippsprungwerk, wobei das Schaltstück kipp-punkt-gelagert ist. Die Kontaktkraftfeder greift derart am Schaltstück an, dass sie infolge der durch hohe Überströme erzeugten elektrodynamischen Kraft den Kippsprung vermittelt; sie stellt beim Überschreiten des Kipp-Punkts die Öffnungsstellung sicher. Die vorzugsweise druckbeanspruchte Kontaktkraftfeder greift zwischen Gehäuse und Schaltstück an, wobei sich die Drehachse des Schaltstücks bei einer instabilen Zwischenstellung des Schaltstücks in gerader Linie mit der Wirkrichtung der Kontaktkraftfeder befindet.
Further embodiments are proposed:
  • Contact system operatively connected to a switch lock, whereby an interruption of the current flow takes place, so that even after re-closing of the contact due to the decreasing current no reopening process is initiated.
  • Contact system with a Kippsprungwerk, wherein the contact piece is tilt-point-mounted. The contact force spring acts on the switching piece so that it gives the tipping jump as a result of the electrodynamic force generated by high overcurrents; it ensures the opening position when the tilting point is exceeded. The preferably pressure-loaded contact force spring engages between the housing and switching piece, wherein the axis of rotation of the switching piece is in an unstable intermediate position of the switching piece in a straight line with the effective direction of the contact force spring.

In einer besonderen Ausgestaltung bezüglich der Länge des Langlochs, kann jedoch auch erreicht werden, dass auch die Schaltwelle und ihr Lager ein Rest an Verformungsenergie aufnehmen. Die Länge des Langlochs läßt sich so wählen, dass nach Berührung des zweiten Anschlags und der dann sich fortsetzenden Drehung der Lagerstift am Ende des Langlochs anschlägt, bevor der erste Anschlag erreicht wird. Beim Auftreffen am Ende des Langlochs wird die Schaltwelle und ihr Lager belastet und Energie wird in der Schaltwelle und in ihrem Lager dissipiert.In a particular embodiment with respect to the length of the slot, however, it can also be achieved that the selector shaft and its bearing also absorb a residual amount of deformation energy. The length of the slot can be selected so that after touching the second stop and the then continuing rotation of the bearing pin abuts the end of the slot before the first stop is reached. When hitting the end of the slot, the shift shaft and its bearing is loaded and energy is dissipated in the stem and in their camp.

Die Vernichtung der kinetischen Energie des Schaltstücks erfolgt somit in einer Vielzahl von Teilen (Schaltstück selbst; Kontaktkraftfeder, beide Anschläge, Schaltwelle und Lager der Schaltwelle), wobei auch Lagertoleranzen eine Rolle spielen, weil diese von Natur aus und im Zuge der Lebensdauer des Schalters einen Rest von Unbestimmtheit mitsichbringen, die von vornherein konstruktiv nicht vollständig berücksichtigt werden können.The destruction of the kinetic energy of the contact piece is thus in a variety of parts (contact piece itself, contact force spring, both stops, stem and bearings of the shift shaft), bearing tolerances play a role, because these inherently and in the course of the life of the switch a The rest of indeterminacy mitsichbringen, which can not be fully considered constructively from the outset.

Die beiden Armabschnitte sollten möglichst nicht punktförmig ausgebildet sein. Die Flächen der beiden Armabschnitte können jedoch klein gewählt werden. Die Dimension des Schaltstücks (insbesondere seine Dicke) muss nicht besonders verändert oder angepasst sein; es können bei der Erfindung auf Verbreiterungen und Verlängerungen der Flächen der beiden Anschläge und der beiden Armabschnitte verzichtet werden.The two arm sections should preferably not be punctiform. However, the areas of the two arm sections can be chosen small. The dimension of the contact piece (in particular its thickness) need not be particularly changed or adapted; it can be dispensed with in the invention to broadening and extensions of the surfaces of the two stops and the two arm portions.

Die Materialauswahl für den Anschlag sollte vorzugsweise gezielt auf schlagfeste Kunststoffe gerichtet werden, wobei dem Fachmann geeignete marktgängige Materialien zur Verfügung stehen. Das Gehäuse kann vorzugsweise aus mehreren Kammern ausgebildet sein, wobei eine obere Kammer den ersten Anschlag und eine untere Kammer den zweiten Anschlag enthält. Die Kammern sind so ausgebildet, dass sie mit den übrigen Teilen des Kontaktssystems und des Gehäuses eine Modularität bilden, die zur Vereinfachung der Herstellung und des Zusammenbaus beitragen und Erweiterungen zu Kontaktsystem mit anderen Leistungsbereichen in einfacher Weise zulassen.The choice of material for the stop should preferably be directed specifically to impact-resistant plastics, with the person skilled in the art suitable marketable materials are available. The housing may preferably be formed of a plurality of chambers, wherein an upper chamber containing the first stop and a lower chamber containing the second stop. The chambers are designed to be modular with the remaining parts of the contact system and the housing, which aid in ease of manufacture and assembly and allow expansion to contact system with other performance areas in a simple manner.

Das Schaltstück kann einarmig oder zweiarmig ausgebildet sein. Bei jeweils einer dieser beiden Ausbildungen kann der Angriffspunkt und die Angriffsrichtung der Kontaktkraftfeder für den speziellen Fall eingerichtet sein. Die Kontaktkraftfeder kann als Zug- oder als Druckfeder wirken.The switching piece can be designed with one arm or two arms. In each case one of these two embodiments, the point of attack and the direction of attack of the contact force spring can be set up for the specific case. The contact force spring can act as a tension or compression spring.

Vorzugsweise sollte jedes der beiden Schaltstückabschnitte am die Kontaktauflage tragenden Arm des Schaltstücks angeordnet sein. In diesem Fall wird ein einarmiges Schaltstück eingesetzt.Preferably, each of the two switching piece sections should be arranged on the contact bearing bearing arm of the switching piece. In this case, a one-armed contact piece is used.

Das Schaltstück kann auch zweiarmig ausgebildet sein, wobei dann an jedem Arm des Schaltstücks ein Schaltstückabschnitt angeordnet ist. Hierbei kann vorzugsweise der die Kontaktauflage tragende Arm des Schaltstücks länger ausgebildet sein, als der kontaktferne Arm des Schaltstücks.The switching piece may also be formed with two arms, in which case a switching piece section is arranged on each arm of the switching piece. Here, preferably, the contact bearing bearing arm of the contact piece may be formed longer than the contact remote arm of the contact piece.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus dem folgenden, anhand von Figuren erläuterten Ausführungsbeispiel. Es zeigen im Einzelnen:

  • Fig. 1: die Stellung des Kontaktsystems (im Schnitt) beim Auftreffen auf den zweiten Anschlag während der Öffnungsbewegung,
  • Fig. 2: die Stellung des Kontaktsystems beim Auftreffen auf den ersten Anschlag und
  • Fig. 3: eine Explosionsdarstellung der Kontaktanordnung.
Further details and advantages of the invention will become apparent from the following, explained with reference to figures embodiment. They show in detail:
  • 1: the position of the contact system (in section) when hitting the second stop during the opening movement,
  • Fig. 2: the position of the contact system when hitting the first stop and
  • 3 shows an exploded view of the contact arrangement.

In Fig. 1 ist das Kontaktsystem eines Niederspannungs-Leistungsschalters mit kipppunkt-gelagertem, zweiarmigen Schaltstück beim Auftreffen auf den zweiten Anschlag 34 während der Öffnungsbewegung dargestellt. In Fig. 2 ist das Auftreffen auf den ersten Anschlag 24 und die noch vorhandene Berührung am zweiten Anschlag 34 zu erkennen.In Fig. 1, the contact system of a low-voltage circuit breaker is shown with tilt-point-mounted, two-armed contact piece when hitting the second stop 34 during the opening movement. In Fig. 2, the impact on the first stop 24 and the remaining contact on the second stop 34 can be seen.

Die Fig. 3 zeigt drei parallel angeordnete Kontaktsysteme, die über die Schaltwelle verbunden sind. Hier handelt es sich um eine bevorzugte Ausführungsform, in der die Lagerung des Schaltstücks exzentrisch in oder an der Schaltwelle erfolgt. Als Alternative wird beansprucht - jedoch in den Figuren nicht dargestellt, dass das Schaltstück über ein Langloch im Gehäuse oder in einem Gehäuseteil gelagert ist. Die in der Erfindung angesprochenen dynamischen Verhältnisse sind in beiden Anordnungen dieselben. Der wesentliche Punkt ist, dass während der Öffnungsbewegung des Schaltstücks das Langloch ortsfest bleibt.Fig. 3 shows three parallel contact systems, which are connected via the switching shaft. This is a preferred embodiment in which the bearing of the contact piece is eccentric in or on the shift shaft. As an alternative is claimed - but not shown in the figures, that the contact piece is mounted on a slot in the housing or in a housing part. The dynamic ratios addressed in the invention are the same in both arrangements. The essential point is that during the opening movement of the contact piece, the slot remains stationary.

Die Stromlaufbahn des Kontakts ist nicht dargestellt. Die Stromlaufbahn wird durch das einfach unterbrechende Schaltstück (als Drehkontakt) geöffnet und geschlossen. Das Schaltstück 10 ist um die Rotationsachse zwischen seiner Schließ- und Öffnungsposition drehbeweglich. Das Schaltstück hat einen längeren 18 und einen kürzeren Arm 20. Der längere Arm 18 trägt eine nicht näher gezeigte Kontaktauflage zur Kontaktierung des Festkontakts. Am kürzeren Arm 20 ist ein Abschnitt 32 (eine Anschlagnase) ausgebildet, der mit einem Anschlag 34 im Gehäuse korrespondiert.The current path of the contact is not shown. The current path is opened and closed by the simply interrupting contact piece (as a rotary contact). The contact piece 10 is rotatable about the axis of rotation between its closed and open position. The contact piece has a longer 18 and a shorter arm 20. The longer arm 18 carries a contact pad not shown in detail for contacting the fixed contact. On the shorter arm 20, a portion 32 (a stop lug) is formed, which corresponds to a stop 34 in the housing.

In der Einschaltstellung des Schalters fließt der Nennstrom durch die Stromlaufbahn, wobei er durch eine Stromschiene eintritt, durch den Kontakt, das Schaltstück und den festen Kontakt fließt und über eine zweite Stromschiene mit Anschlussfahne das Gehäuse verlässt. Durch Drehung B1 des Schaltstücks 10 im Uhrzeigersinn wird das Kontaktpaar getrennt. Die Stromschienen sind als Stromschleife ausgebildet, um mit dem elektrodynamischen Effekt eine schnelle Schalteröffnung zu erreichen. Mit Bezugszeichen 70 ist eine Löschkammer angedeutet.In the switch-on position of the switch, the rated current flows through the circuit path, wherein it passes through a bus bar, flows through the contact, the contact piece and the fixed contact and leaves the housing via a second bus bar with terminal lug. By rotation B1 of the contact piece 10 in a clockwise direction, the contact pair is disconnected. The busbars are designed as a current loop to the electrodynamic effect to achieve a fast switch opening. Reference numeral 70 indicates a quenching chamber.

Die Betätigung und das Auslösen des Schaltantriebs sind wie üblich ausgeführt. Beide sind jedoch hier nicht dargestellt.The actuation and the triggering of the switching drive are carried out as usual. Both are not shown here.

Die Lagerung des Schaltstücks 10 erfolgt in einem Langloch 27 schwimmend über einen Lagerstift 15, der koaxial zur Seite des Schaltstücks gerichtete Drehzapfen hat. Der Lagerstift bildet die Rotationsachse während der Öffnungsbewegung. Lagerstift und Schaltwelle liegen parallel zueinander. Das Schaltstück gemäß der Fig. 1 ist kipp-punkt-gelagert. Je nach Drehlage bezüglich des Totpunkts der Lagerung springt das Schaltstück unterstützt durch die Kraft der Kontaktkraftfeder in die Offen- oder in die Geschlossen-Stellung. Halten und Führen des Schaltstücks 10 geschieht durch die Kontaktkraftfeder 40. Die Kontaktkraftfeder 40 ist mit einem Ende an einem Gegenlager 52 im Gehäuse 100 fixiert. Die Kontaktkraftfeder belastet über einen Federstößel 42 das Schaltstück 10 an einer Lagerstelle 17 in Richtung auf den Lagerpunkt im Gehäuse. Die Lagerstelle 17 ist als halbrunde Auskehlung ausgebildet.The bearing of the contact piece 10 takes place in a slot 27 floating on a bearing pin 15 which has coaxially directed to the side of the contact piece pivot. The bearing pin forms the axis of rotation during the opening movement. Bearing pin and selector shaft are parallel to each other. The contact piece according to FIG. 1 is tilt-point-mounted. Depending on the rotational position with respect to the dead center of the bearing, the switching piece jumps supported by the force of the contact force spring in the open or in the closed position. Holding and guiding the switching piece 10 is done by the contact force spring 40. The contact force spring 40 is fixed at one end to a counter-bearing 52 in the housing 100. The contact force spring loaded via a spring plunger 42, the contact piece 10 at a bearing point 17 in the direction of the bearing point in the housing. The bearing 17 is formed as a semicircular groove.

In bekannten Anordnungen mit einer üblichen Ausgestaltung an solchen Leistungsschaltern schlägt der Schaltstückabschnitt 22 am langen Hebelarm 18 am Ende der Öffnungsbewegung auf nur einen Anschlag auf, der in den Figuren etwa dem Anschlag mit Bezugszeichen 24 entspricht. Mit dem Auftreffen ist eine besonders starke dynamische Belastung der Schalterelemente (insbesondere der Lager- und Gehäuseteile) verbunden.In known arrangements with a conventional design of such circuit breakers, the contact piece section 22 abuts the long lever arm 18 at the end of the opening movement to only one stop, which corresponds approximately to the stop with reference numeral 24 in the figures. With the impact of a particularly strong dynamic load of the switch elements (in particular the bearing and housing parts) is connected.

Erfindungsgemäß sind im Unterteil des Gehäuses 100 - hier in einer Gehäuse-Teilkammer 104 - ein zweiter Anschlag 34 und am kurzen Hebelarm 20 ein zugeordneter Abschnitt 32 ausgebildet. Der Abschnitt 32 schlägt nach dem Öffnen des Kontaktsystems vor jeder anderen Berührung des Schaltarms mit Gehäuseteilen am zweiten Anschlag 34 an. Die Berührung des ersten Abschnitts 22 mit dem ersten Anschlag 24 erfolgt später. Beide Abschnitte sind vorzugsweise flächig und nicht punktförmig ausgebildet. In der in der Zeichnung dargestellten Ausführungsform ist die Berührungsfläche des ersten Abschnitts 22 und die zugehörige Fläche des Anschlags 24 größer als die Berührungsfläche und Anschlagfläche 34 des zweiten Abschnitts 32.According to the invention, a second stop 34 and, on the short lever arm 20, an associated section 32 are formed in the lower part of the housing 100 - here in a housing partial chamber 104. The section 32 suggests after opening the contact system before any other contact of the switching arm with housing parts on the second stop 34. The contact of the first portion 22 with the first stop 24 takes place later. Both sections are preferably flat and not punctiform. In the embodiment shown in the drawing, the contact area of the first portion 22 and the associated surface of the stop 24 is greater than the contact surface and abutment surface 34 of the second portion 32nd

In der Stellung des Schaltstücks gemäß Fig. 2 herrscht die stärkste Belastung für die Teile des Gehäuses und des Kontaktsystems. Am Ende des Öffnungsvorgangs - also in seiner Ruhestellung - hat das Kontaktsystem etwa wieder die Stellung wie in Fig. 1. Das Schaltstück ist von der Druckfeder einen kurzen Weg zurückbewegt worden. In dieser nicht gezeigten Endstellung liegt der zweite Armabschnitt am zweiten Anschlag, jedoch der erste Armabschnitt nicht mehr am ersten Anschlag an.In the position of the contact piece shown in FIG. 2, the strongest load for the parts of the housing and the contact system prevails. At the end of the opening process - so in its rest position - the contact system has approximately the same position as in Fig. 1. The switching piece has been moved back a short distance from the compression spring. In this end position, not shown, the second arm portion is located on the second stop, but the first arm portion is no longer on the first stop.

Die schwimmende Lagerung des Schaltstücks und die Längserstreckung des Langlochs 27 im Schaltstück ist dergestalt, dass die Längserstreckung des Langlochs parallel der Hauptkomponente der Bewegung B2 des Schaltstücks liegt, während sich der Drehpunkt im zeitlich zuerst getroffenen Anschlag 34 befindet. Das Schaltstück kann sich translatorisch im Langloch bewegen, wobei die Kontaktkraftfeder 40 eine weitere Kompression (und damit Federarbeit) erfährt.The floating bearing of the contact piece and the longitudinal extension of the slot 27 in the contact piece is such that the longitudinal extent of the slot parallel to the main component of the movement B2 of the contact piece, while the pivot point is in the first hit stop 34. The switching piece can move translationally in the slot, wherein the contact force spring 40 undergoes further compression (and thus spring work).

Mit Bezugszeichen 36 ist eine erste Anlagefläche gekennzeichnet, die eine mechanische Belastungszone des Schaltstücks, der Schaltwelle und ihres Lagers darstellt. Die mechanische Belastung tritt durch die Dreh-Bewegung B2 um den durch den zweiten Anschlag 34 gegebenen Drehpunkt auf. Die Drehung B2 ist solange unbehindert, bis der Lagerstift 15 am Ende des Langlochs anschlägt, wenn die Länge des Langlochs entsprechend kurz gewählt ist. Während der Drehung wird die Kontaktkraftfeder 40 und ihr Gegenlager 52 belastet, wodurch kinetische Energie in der Kontaktkraftfeder und im Lager verbraucht wird.Reference numeral 36 denotes a first contact surface, which represents a mechanical load zone of the contact piece, the switching shaft and its bearing. The mechanical load occurs by the rotational movement B2 about the given by the second stop 34 pivot point. The rotation B2 is unhindered until the bearing pin 15 abuts the end of the slot when the length of the slot is selected to be correspondingly short. During the rotation, the contact force spring 40 and its abutment 52 is loaded, whereby kinetic energy is consumed in the contact force spring and the bearing.

Nach Auftreffen am Ende des Langlochs wird die Schaltwelle und ihr Lager belastet; Energie wird in der Schaltwelle und in ihrem Lager dissipiert. Die hierbei entstehende zweite Anlagefläche (hier also eine zweite mechanische Belastungszone) ist mit dem schon geannten Bezugszeichen 36' gekennzeichnet.After hitting the end of the slot, the shift shaft and its bearing is loaded; Energy is dissipated in the stem and in their bearings. The resulting second contact surface (in this case a second mechanical stress zone) is labeled with the already mentioned reference numeral 36 '.

Die Fig. 3 zeigt drei Kontaktsysteme, mit Lagergehäuse 52 für die Kontaktkraftfeder 40 und die Schaltwelle 60. Oberhalb des Schaltstücks 10 ist der Lagerstift 15 zu erkennen, dessen beide Enden die Drehzapfen bilden. Das Schaltstück ist über den Lagerstift exzentrisch zur Schaltwellenachse in der Schaltwelle 60 gelagert. Das Lager im mittleren Lagerblock 64 besteht aus einem in der Figur nicht erkennbarem Langloch.Fig. 3 shows three contact systems, with bearing housing 52 for the contact force spring 40 and the shift shaft 60. Above the contact piece 10, the bearing pin 15 can be seen, form the two ends of the pivot. The switching piece is mounted eccentrically to the switching shaft axis in the switching shaft 60 via the bearing pin. The bearing in the middle bearing block 64 consists of a not visible in the figure slot.

Bezugszeichenliste: (nicht mitschicken an das Patentamt)List of Reference Signatures: (do not send to the Patent Office)

1010
Schaltstückswitching piece
1515
Lagerstift mit DrehzapfenBearing pin with pivot
1717
Ausnehmungrecess
1818
langer Hebelarmlong lever arm
2020
kurzer Hebelarmshort lever arm
2222
erster Abschnittfirst section
2424
erster Anschlagfirst stop
2727
Lagerstelle, LanglochBearing point, oblong hole
3232
zweiter Abschnittsecond part
3434
zweiter Anschlagsecond stop
3636
Belastungszoneloading zone
4040
KontaktkraftfederContact force spring
4242
Federstößelspring plunger
5252
Federlagerspring camp
6060
Schaltwelleshift shaft
6464
Lagerblockbearing block
7070
Löschkammerextinguishing chamber
100100
Gehäusecasing
102102
obere Kammerupper chamber
104104
untere Kammerlower chamber
B1B1
Öffnungsbewegungopening movement
B2B2
TranslationTranslation

Claims (10)

  1. Contact system for a low voltage switch, in particular a power switch, having an electrodynamically induced opening force, with a switch piece (10) floatingly mounted in a switch housing (100) for each pole, said switch piece having a contact support and a fixed contact with the associated fixed contact support,
    with a contact pressure spring (40) acting on the switch piece,
    with a first stop (24) arranged in the switch housing (100) for stopping a first switch piece portion (22) at the end of the opening movement (B1) of the switch piece (10),
    a second stop (34) being formed in the switch housing (100) of the contact system, which stop is associated with a second portion (32) of the switch piece (10) for stopping the second portion (32),
    the second stop (34) being positioned at such an angle to the first stop (24) that the second portion (32) meets the second stop (34) after a shorter angular path in the opening movement than the first portion (22) meets the first stop (24);
    that the floating mount is achieved in that there is located at the switch piece (10) a bearing pin (15) which is mounted with play and undisplaceably, at least during the dynamic opening, in a slot (27),
    characterised
    in that the longitudinal extension of the slot (27) lies parallel or virtually parallel to the effective direction of the contact pressure spring (40), the longitudinal extension of the slot (27) allowing a rotation (B2) of the switch piece (10) after meeting the second stop (34) around a centre of rotation which lies in the second stop (34) and
    in that during rotation (B2) the contact pressure spring (40) performs spring work.
  2. Contact system according to any one of the preceding claims, characterised in that the length of the slot (27) is such that during rotation (B2) of the switch piece (10) after meeting the second stop (34) but before the first portion (22) meets the first stop (24) the bearing pin (15) reaches the end (36') of the slot (27) and work of deformation is produced in the bearing shaft or in the bearing thereof.
  3. Contact system according to either claim 1 or claim 2, characterised in that the bearing pin (15) engages in a slot (27) on both sides of the switch piece.
  4. Contact system according to any one of the preceding claims, characterised in that the slot bearing (27) is arranged in the housing or in a housing part.
  5. Contact system according to any one of claims 1, 2 or 3, characterised in that the slot bearing (27) is arranged off-centre on the selector shaft of the contact system.
  6. Contact system according to any one of the preceding claims, characterised in that the switch piece (10) is formed with two arms and in that a switch piece portion (22, 32) is arranged on each arm of the switch piece (10).
  7. Contact system according to any one of the preceding claims, characterised in that at least a stop (24, 34) is formed in a respective housing compartment (102, 104) of shock-resistant plastics material.
  8. Contact system according to any one of the preceding claims, characterised in that the working point of the contact pressure spring (40) is formed as a recess (17) in the switch piece (10).
  9. Contact system according to any one of the preceding claims, characterised in that the contact system is effectively connected to a switch latch.
  10. Contact system according to any one of the preceding claims, characterised in that the switch piece (10) is mounted with a change-over point and the contact pressure spring (40) acts on the switch piece (10) in such a way that said spring acts as a trigger.
EP03023418A 2002-11-13 2003-10-17 Contact system for a low voltage switch Expired - Lifetime EP1420432B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10252741A DE10252741B3 (en) 2002-11-13 2002-11-13 Contact system for low voltage power switch, has switch piece floating bearing provided by bearing pin located in elongate opening for rotation of switch piece upon abutting stop provided by switch housing
DE10252741 2002-11-13

Publications (3)

Publication Number Publication Date
EP1420432A2 EP1420432A2 (en) 2004-05-19
EP1420432A3 EP1420432A3 (en) 2004-09-08
EP1420432B1 true EP1420432B1 (en) 2007-11-28

Family

ID=30775615

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03023418A Expired - Lifetime EP1420432B1 (en) 2002-11-13 2003-10-17 Contact system for a low voltage switch

Country Status (3)

Country Link
EP (1) EP1420432B1 (en)
AT (1) ATE379844T1 (en)
DE (2) DE10252741B3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007003674B3 (en) * 2007-01-18 2008-11-06 Moeller Gmbh Bearing block for e.g. power switch, has axle with half shell section positioned such that switching piece is pivoted during engagement of force device, where piece is switched-on, switched-off and released in three positions
WO2011097612A1 (en) * 2010-02-08 2011-08-11 Siemens Aktiengesellschaft Circuit breaker electrical contact assembly, and systems and methods using same
CN102376497B (en) * 2010-08-23 2014-02-26 上海电科电器科技有限公司 Slice-type contact structure of moulded case circuit breaker
DE102011003131A1 (en) 2011-01-25 2012-07-26 Siemens Aktiengesellschaft Electric switch
CN108597921B (en) * 2018-06-08 2023-11-14 苏州华之杰电讯股份有限公司 Switch using contact group mechanism

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488133A (en) * 1983-03-28 1984-12-11 Siemens-Allis, Inc. Contact assembly including spring loaded cam follower overcenter means
DE3901852A1 (en) * 1989-01-23 1990-07-26 Kloeckner Moeller Elektrizit CONTACT SYSTEM FOR CURRENT CIRCUIT BREAKERS
US5258733A (en) * 1992-08-06 1993-11-02 Eaton Corporation Molded case circuit breaker having improved trip unit
IT1292453B1 (en) * 1997-07-02 1999-02-08 Aeg Niederspannungstech Gmbh ROTATING GROUP OF CONTACTS FOR HIGH FLOW SWITCHES
US5926081A (en) * 1997-09-23 1999-07-20 Siemens Energy & Automation, Inc. Circuit breaker having a cam structure which aids blow open operation
US6114641A (en) * 1998-05-29 2000-09-05 General Electric Company Rotary contact assembly for high ampere-rated circuit breakers

Also Published As

Publication number Publication date
EP1420432A2 (en) 2004-05-19
ATE379844T1 (en) 2007-12-15
EP1420432A3 (en) 2004-09-08
DE10252741B3 (en) 2004-02-26
DE50308679D1 (en) 2008-01-10

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