WO1998002892A1 - Switching contact arrangement with a hinge arrangement for a contact lever - Google Patents
Switching contact arrangement with a hinge arrangement for a contact lever Download PDFInfo
- Publication number
- WO1998002892A1 WO1998002892A1 PCT/DE1997/001472 DE9701472W WO9802892A1 WO 1998002892 A1 WO1998002892 A1 WO 1998002892A1 DE 9701472 W DE9701472 W DE 9701472W WO 9802892 A1 WO9802892 A1 WO 9802892A1
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- WO
- WIPO (PCT)
- Prior art keywords
- contact
- contact lever
- lever
- arrangement
- switching
- 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.)
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Classifications
-
- 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
- H01H1/226—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 having a plurality of parallel contact bars
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- 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
- H01H1/24—Contacts characterised by the manner in which co-operating contacts engage by abutting with resilient mounting
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- 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
- H01H1/226—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 having a plurality of parallel contact bars
- H01H2001/228—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 having a plurality of parallel contact bars with insulating spacers between the contact bars
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H2009/305—Means for extinguishing or preventing arc between current-carrying parts including means for screening for arc gases as protection of mechanism against hot arc gases or for keeping arc gases in the arc chamber
Definitions
- the invention relates to a switching contact arrangement of a low-voltage circuit breaker with a contact lever carrier and with at least one contact lever which is arranged movably relative to the contact lever by means of a joint arrangement and is biased by at least one spring in the direction of a fixed switching contact, and with at least one the contact lever with a stationary connecting rail connecting flexible conductor.
- a switch contact arrangement with this feature has become known from DE 44 16 105 Cl.
- the hinge arrangement is formed by a bearing bolt passing through the contact lever. Since the contact levers are made of copper with a given cross-section in consideration of the lowest possible heating during operation, the bearing opening in the contact lever requires such a dimensioning that a sufficient lifespan of the joint arrangement is achieved despite the relatively soft material of the contact lever.
- the bearing opening reduces the cross-section of the contact lever at a mechanically highly stressed point and also reduces the current-carrying cross-section of the contact lever. This entails the risk of increased local heating, which can only be compensated for by an enlarged cross section of the contact lever.
- the object of the invention is to create a switch contact arrangement with a long service life for the joint arrangement of the contact lever without additional material expenditure.
- this object is achieved in that the joint arrangement by a rolling surface arranged on the contact lever and a cooperating with it, on the Contact lever carrier arranged support surface is formed and that a holding device detecting the contact lever is attached to the contact lever carrier to secure against displacement of the contact lever parallel to the support surface.
- the new joint arrangement makes the previous bearing openings of the contact levers unnecessary. As a result, a larger cross section is available, which is favorable for the mechanical strength and the electrical properties of the contact lever.
- the rolling surface can be dimensioned without difficulty so that a lower specific stress than in the previous bearing opening occurs. Therefore, a reduction in the hardness of the copper used to manufacture the contact lever due to the supply of heat when soldering or welding the flexible conductors is less critical than before.
- the new joint arrangement can be implemented with surprisingly few changes to existing switch contact arrangements. This can be done in that the rolling surface arranged opposite the contact lever on its contacting side has a negative curvature and the supporting surface located on the contact lever carrier has a positive curvature, the radius of curvature of the rolling surface being larger than the radius of curvature of the supporting surface.
- the mentioned holding device for the contact lever can also be realized with advantageously simple means.
- the holding device can use the contact lever have on its contacting side in a region opposite the rolling surface overlapping, articulated on the contact lever support brackets, the contact lever having a retaining tab to be overlapped by the retaining bracket.
- Such a retaining bracket can at the same time be formed as a spacer for several adjacent contact levers by integrally formed webs.
- the contact lever carriers of switch contact arrangements of the present type can consist of both metal and plastic. If contact lever carriers made of plastic are to have particularly resistant contact surfaces for the contact lever, it is advisable to provide the contact surfaces with a metal plate.
- Figure l shows schematically a low-voltage power switch in section.
- FIG. 2 the movable part of a switch contact arrangement is partially shown in section.
- FIG. 3 shows a section III-III in FIG. 2 to illustrate details of a holding bracket.
- FIG. 4 shows an enlarged area of a contact lever with adjoining parts.
- the low-voltage circuit breaker 1 shown schematically in section in FIG. 1 has a housing 2 in which, depending on the number of poles required, a switch contact system 3 or more such switch contact systems are arranged in parallel with one another.
- Each switch contact system 3 has an upper connecting rail 4 with a fixed switch contact 5 attached to it and a movable switch contact 6.
- the movable switch contact 6 represents an assembly which comprises a movable contact lever carrier 7 and at least one contact lever 10 pivotally mounted thereon.
- Flexible conductors 11 connect the contact lever (s) 10 to a lower connecting rail 12.
- Above the switch contact system 3 there is an arc extinguishing chamber 13 for extinguishing the switching arc which arises when the switch contact arrangement 3 is opened.
- the contact lever carrier 7 can be actuated by a drive device 14 which has a switching shaft 15 which is common to all adjacent poles of the circuit breaker 1 and which is connected to the contact lever carriers 7 of the individual poles by a coupling linkage 16.
- the contact lever carrier 7 consists of a pole insulating body 17 made of insulating plastic to be connected to the coupling linkage 16 and side walls 20 made of sheet metal attached to the pole insulating body 17 on both sides.
- the contact lever 10 shown is provided with a contact pad 21 on its contacting side 18 facing the fixed switching contact 5.
- On its side opposite the contacting side 18 The rear side of the contact lever 10 has a rolling surface 22, which rests on a bearing surface 23 of the pole insulating body 17. As shown, the rolling surface 22 is designed with a negative curvature, while the bearing surface 23 has a positive curvature, namely with a smaller radius of curvature.
- the contact lever 10 can therefore be pivoted relative to the insulating body 17 in the direction of an arrow 25 against the action of two contact force springs 24 arranged in parallel.
- a contact force of the desired magnitude arises between the contact support 21 and the fixed switch contact 5 when the movable switch contact 6 is actuated by the drive device 14 about a pivot bearing 26 indicated in FIG.
- a holding bracket 27 engages over the contact lever 10 and thereby maintains contact between the rolling surface 22 and the support surface 23.
- the holding bracket 27 ensures that the contact lever 10 cannot be moved parallel to the bearing surface 23.
- a plurality of contact levers 10 can be arranged parallel to one another in each pole of the circuit breaker 1.
- five parallel contact levers 10 are shown in section as an example.
- the holding bracket 27 is common to all contact levers 10 and has integrally formed separating webs 30 which act as spacers for the adjacent contact levers 10. With external pins 31, the holding bracket 27 engages in bearing openings 32 in the side walls 20 of the contact lever carrier 17. Therefore, the bracket 27 can participate in the pivoting movement of the contact lever 10 relative to the Polisolierk ⁇ rper 17.
- Figure 3 is also a fixed with the side Walls 20 connected insulating shield 33 shown that shields the area of the movable switching contact 6 located below the contact pads 21 against the influence of arcing gases (see. DE 295 03 327 Ul).
- the contact levers 10 are each provided on their contacting side 18 with a retaining lug 34 opposite the rolling surface 22, which are overlapped by the retaining bracket 27 with a U-shaped cross section.
- a further embodiment is shown in FIG. 4 as a metal plate 35 which is embedded in the material of the pole insulating body 17 in order to increase the service life of the support surface 23.
- the radius of curvature of the rolling surface 22 and the associated support surface 23 can be dimensioned much larger than is possible in a joint arrangement with a bearing pin passing through the contact lever.
- the contact surface between the surfaces mentioned is relatively large. This results in an advantageously low specific stress on the interacting parts. Heating the contact lever 10 when the flexible conductor 11 is attached (FIG. 1 and FIG. 2) therefore has a less detrimental effect on the life of the joint arrangement than in the case of previously used switch contact arrangements.
- the full cross section is available for the current transmission.
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Abstract
Description
Beschreibungdescription
Schaltkontaktanordnung mit einer Gelenkanordnung für einen KontakthebelSwitching contact arrangement with a joint arrangement for a contact lever
Die Erfindung betrifft eine Schaltkontaktanordnung eines Niederspannungs-Leistungsschalters mit einem Kontakthebelträger und mit wenigstens einem Kontakthebel, der mittels einer Gelenkanordnung relativ zu dem Kontakthebel räger beweglich angeordnet und durch wenigstens eine Feder in Richtung eines feststehenden Schaltkontaktes vorgespannt ist, sowie mit wenigstens einem den Kontakthebel mit einer ortsfesten Anschlußschiene verbindenden biegsamen Leiter.The invention relates to a switching contact arrangement of a low-voltage circuit breaker with a contact lever carrier and with at least one contact lever which is arranged movably relative to the contact lever by means of a joint arrangement and is biased by at least one spring in the direction of a fixed switching contact, and with at least one the contact lever with a stationary connecting rail connecting flexible conductor.
Eine Schaltkontaktanordnung mit diesen Merkmal ist durch die DE 44 16 105 Cl bekanntgeworden. Die Gelenkanordnung wird dabei durch einen den Kontakthebel durchsetzenden Lagerbolzen gebildet. Da die Kontakthebel bei gegebenem Querschnitt mit Rücksicht auf möglichst geringe Erwärmung im Betrieb aus Kupfer hergestellt werden, bedarf die Lagerδffnung im Kontakthebel einer solchen Bemessung, daß trotz des verhältnismäßig weichen Werkstoffes des Kontakthebels eine ausreichende Lebensdauer der Gelenkanordnung erzielt wird. Die Lageröffnung verringert allerdings den Querschnitt des Kontakthebels an einer mechanisch hochbelasteten Stelle und verringert ebenfalls den stromtragenden Querschnitt des Kontakthebels. Dies bringt die Gefahr einer erhöhten örtlichen Erwärmung mit sich, die nur durch einen vergrößerten Querschnitt des Kontakthebels ausgeglichen werden kann. Als weiteres Problem, das die Lebensdauer der Gelenkanordnung nachteilig beeinflussen kann, kommt die mit einer Wärmeverwendung verbundene Befestigung des biegsamen Leiters an dem Kontakthebel hinzu. Gleichgültig, welches der verschiedenen bekannten Lδt- oder Schweißverfahren eingesetzt wird, kommt es nämlich bei dem zur Herstellung des Kontakthebels verwendeten Kupfer durch Zufuhr von Wärme zu einer Rekristallisation und damit zu einer Verringerung der Härte. Will man vermeiden, daß hiervon auch der Bereich der erwähnten Lagerόff- nung betroffen ist, so kann dies durch einen größeren Abstand der Lagerδffnung von dem Bereich des Kontakthebels erreicht werden, an dem der biegsame Leiter angebracht wird. Dies bedeutet aber eine unerwünschte Vergrößerung des Kontakthebel und damit verschlechterte schalttechnische Eigenschaf en sowie erhöhten Materialbedarf.A switch contact arrangement with this feature has become known from DE 44 16 105 Cl. The hinge arrangement is formed by a bearing bolt passing through the contact lever. Since the contact levers are made of copper with a given cross-section in consideration of the lowest possible heating during operation, the bearing opening in the contact lever requires such a dimensioning that a sufficient lifespan of the joint arrangement is achieved despite the relatively soft material of the contact lever. The bearing opening, however, reduces the cross-section of the contact lever at a mechanically highly stressed point and also reduces the current-carrying cross-section of the contact lever. This entails the risk of increased local heating, which can only be compensated for by an enlarged cross section of the contact lever. Another problem that can adversely affect the life of the hinge assembly is the heat-related attachment of the flexible conductor to the contact lever. Regardless of which of the various known soldering or welding methods is used, the copper used to produce the contact lever recrystallizes and thus reduces the hardness by adding heat. If one wants to avoid that this also affects the area of the mentioned bearing opening, this can be achieved by a greater distance of the bearing opening from the area of the contact lever to which the flexible conductor is attached. However, this means an undesirable enlargement of the contact lever and thus deteriorated switching properties and increased material requirements.
Eine andere Möglichkeit besteht in der Anwendung von Schweißverfahren mit einem nur örtlich wirkenden energiereichen Strahl, wie Laserstrahlschweißen oder Elektronenstrahlschwei- ßen. Beide Verfahren erfordern jedoch spezielle und kostspielige Hilfseinrichtungen, deren Anwendung nur bei großen Stückzahlen vertretbar ist.Another possibility is to use welding processes with an energy beam that only acts locally, such as laser beam welding or electron beam welding. However, both methods require special and costly auxiliary devices, the use of which is only justifiable in large quantities.
Der Erfindung liegt hiervon ausgehend die Aufgabe zugrunde, eine Schaltkontaktanordnung mit einer hohen Lebensdauer der Gelenkanordnung des Kontakthebels ohne zusätzlichen Materialaufwand zu schaffen.Proceeding from this, the object of the invention is to create a switch contact arrangement with a long service life for the joint arrangement of the contact lever without additional material expenditure.
Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß die Gelenkanordnung durch eine an dem Kontakthebel angeordnete Wälzfläche und eine mit dieser zusammenwirkende, an dem Kontakthebelträger angeordnete Auflagefläche gebildet ist und daß an dem Kontakthebelträger zur Sicherung gegen eine Verschiebung des Kontakthebels parallel zu der Auflagefläche eine den Kontakthebel erfassende Haltevorrichtung angebracht ist.According to the invention, this object is achieved in that the joint arrangement by a rolling surface arranged on the contact lever and a cooperating with it, on the Contact lever carrier arranged support surface is formed and that a holding device detecting the contact lever is attached to the contact lever carrier to secure against displacement of the contact lever parallel to the support surface.
Durch die neue Gelenkanordnung werden die bisherigen Lageröffnungen der Kontakthebel entbehrlich. Hierdurch steht ein größerer Querschnitt zur Verfügung, was für die mechani- sehe Festigkeit und die elektrischen Eigenschaften des Kontakthebels günstig ist. Auch kann die Wälzfläche ohne Schwierigkeit so bemessen werden, daß eine geringere spezifische Beanspruchung als in der bisherigen Lageröffnung auftritt. Daher ist eine Verringerung der Härte des zur Herstellung des Kontakthebels benutzten Kupfers durch die Wärmezufuhr beim Löten oder Schweißen der biegsamen Leiter weniger kritisch als bisher.The new joint arrangement makes the previous bearing openings of the contact levers unnecessary. As a result, a larger cross section is available, which is favorable for the mechanical strength and the electrical properties of the contact lever. The rolling surface can be dimensioned without difficulty so that a lower specific stress than in the previous bearing opening occurs. Therefore, a reduction in the hardness of the copper used to manufacture the contact lever due to the supply of heat when soldering or welding the flexible conductors is less critical than before.
Die neue Gelenkanordnung ist mit überraschend geringen Ände- rungen an vorhandenen Schaltkontaktanordnungen zu verwirklichen. Dies kann dadurch geschehen, daß die an dem Kontakt- hebel seiner kontaktgebenden Seite gegenüberliegend angeordnete Wälzfläche mit einer negativen Krümmung und die an dem Kontakthebelträger befindliche Auflagefläche eine positive Krümmung aufweist, wobei der Krümmungsradius der Wälzfläche größer als der Krümmungsradius der Auflagefläche bemessen ist.The new joint arrangement can be implemented with surprisingly few changes to existing switch contact arrangements. This can be done in that the rolling surface arranged opposite the contact lever on its contacting side has a negative curvature and the supporting surface located on the contact lever carrier has a positive curvature, the radius of curvature of the rolling surface being larger than the radius of curvature of the supporting surface.
Die erwähnte Haltevorrichtung für den Kontakthebel ist gleichfalls mit vorteilhaft einfachen Mitteln zu verwirklichen. Hierzu kann die Haltevorrichtung einen den Kontakthebel an seiner kontaktgebenden Seite in einem der Wälzfläche gegenüberliegenden Bereich übergreifenden, an dem Kontakt- hebelträger gelenkig abgestützten Haltebügel aufweisen, wobei der Kontakthebel eine von dem Haltebügel zu übergreifende Haltenase besitzt. Ein solcher Haltebügel kann durch angeformte Stege zugleich als Abstandhalter für mehrere benachbarte Kontakthebel ausgebildet sein.The mentioned holding device for the contact lever can also be realized with advantageously simple means. For this purpose, the holding device can use the contact lever have on its contacting side in a region opposite the rolling surface overlapping, articulated on the contact lever support brackets, the contact lever having a retaining tab to be overlapped by the retaining bracket. Such a retaining bracket can at the same time be formed as a spacer for several adjacent contact levers by integrally formed webs.
Die Kontakthebelträger von Schaltkontaktanordnungen der vor- liegenden Art können sowohl aus Metall wie auch aus Kunststoff bestehen. Sollen aus Kunststoff bestehende Kontakthebelträger besonders widerstandsfähige Auflageflächen für die Kontakthebel aufweisen, so empfiehlt es sich, die Auflageflächen mit einer Metallplatte zu versehen.The contact lever carriers of switch contact arrangements of the present type can consist of both metal and plastic. If contact lever carriers made of plastic are to have particularly resistant contact surfaces for the contact lever, it is advisable to provide the contact surfaces with a metal plate.
Die Erfindung wird im folgenden anhand der in den Figuren dargestellten Ausführungsbeispiele näher erläutert .The invention is explained in more detail below with reference to the exemplary embodiments shown in the figures.
Figur l zeigt schematisch einen Niederspannungs-Leistungs- Schalter im Schnitt.Figure l shows schematically a low-voltage power switch in section.
In der Figur 2 ist der bewegbare Teil einer Schaltkontaktanordnung teilweise im Schnitt gezeigt.In FIG. 2, the movable part of a switch contact arrangement is partially shown in section.
Zur Verdeutlichung von Einzelheiten eines Haltebügels zeigt die Figur 3 einen Schnitt III-III in der Figur 2.FIG. 3 shows a section III-III in FIG. 2 to illustrate details of a holding bracket.
In der Figur 4 ist ein mit einer Wälzfläche versehener Bereich eines Kontakthebels mit angrenzenden Teilen vergrö- ßert dargestellt. Der in der Figur 1 schematisch im Schnitt gezeigte Nieder- spannungs-Leistungsschalter 1 weist ein Gehäuse 2 auf, in dem je nach der benötigten Anzahl von Polen ein Schaltkontakt - System 3 oder mehrere solcher Schal kontaktSysteme parallel zueinander angeordnet sind. Jedes Schaltkontaktsystem 3 weist eine obere Anschlußschiene 4 mit einem daran befestigten feststehenden Schaltkontakt 5 sowie einen bewegbaren Schalt- kontakt 6 auf. Der bewegbare Schaltkontakt 6 stellt eine Baugruppe dar, die einen bewegbaren Kontakthebelträger 7 und wenigstens einen daran schwenkbar angebrachten Kontakthebel 10 umfaßt. Biegsame Leiter 11 verbinden den bzw. die Kontakt- hebel 10 mit einer unteren Anschlußschiene 12. Oberhalb des SchaltkontaktSystems 3 befindet sich eine Lichtbogenlöschkammer 13 zur Löschung des beim Öffnen der Schaltkontaktanord- nung 3 entstehenden Schaltlichtbogens.FIG. 4 shows an enlarged area of a contact lever with adjoining parts. The low-voltage circuit breaker 1 shown schematically in section in FIG. 1 has a housing 2 in which, depending on the number of poles required, a switch contact system 3 or more such switch contact systems are arranged in parallel with one another. Each switch contact system 3 has an upper connecting rail 4 with a fixed switch contact 5 attached to it and a movable switch contact 6. The movable switch contact 6 represents an assembly which comprises a movable contact lever carrier 7 and at least one contact lever 10 pivotally mounted thereon. Flexible conductors 11 connect the contact lever (s) 10 to a lower connecting rail 12. Above the switch contact system 3 there is an arc extinguishing chamber 13 for extinguishing the switching arc which arises when the switch contact arrangement 3 is opened.
Der Kontakthebelträger 7 ist durch eine Antriebsvorrichtung 14 betätigbar, die eine für alle benachbarten Pole des Leistungsschalters 1 gemeinsame Schaltwelle 15 aufweist, die mit den Kontakthebelträgern 7 der einzelnen Pole durch ein Koppelgestänge 16 verbunden is .The contact lever carrier 7 can be actuated by a drive device 14 which has a switching shaft 15 which is common to all adjacent poles of the circuit breaker 1 and which is connected to the contact lever carriers 7 of the individual poles by a coupling linkage 16.
Einzelheiten des bewegbaren Teils der Schaltkontaktanordnung 3 werden im folgenden anhand der Figur 2 erläutert. Der Kon- takthebelträger 7 besteht aus einem mit dem Koppelgestänge 16 zu verbindenden Polisolierkörper 17 aus isolierendem Kunststoff sowie beidseitig an den Polisolierkörper 17 angesetzten Seitenwänden 20 aus Blech. Der gezeigte Kontakthebel 10 ist an seiner dem feststehenden Schaltkontakt 5 zugewandten kon- taktgebenden Seite 18 mit einer Kontaktauflage 21 versehen. An seiner der kontaktgebenden Seite 18 gegenüberliegenden Rückseite besitzt der Kontakthebel 10 eine Wälzfläche 22, die an einer Auflagefläche 23 des Polisolierkörpers 17 aufliegt. Wie gezeigt, ist die Wälzfläche 22 mit einer negativen Krümmung ausgeführt, während die Auflagefläche 23 eine positive Krümmung aufweist, und zwar mit einem geringeren Krümmungsradius. Der Kontakthebel 10 kann daher relativ zu den Poliso- lierkδrper 17 entgegen der Wirkung von zwei parallel angeordneten Kontaktkraftfedern 24 in Richtung eines Pfeiles 25 geschwenkt werden. Auf diese Weise entsteht zwischen der Kon- taktauflage 21 und dem feststehenden Schaltkontakt 5 eine Kontaktkraft gewünschter Größe, wenn der bewegliche Schalt- kontakt 6 durch die Antriebsvorrichtung 14 um ein in der Figur 2 angedeutetes Schwenklager 26 betätigt wird. Ein Haltebügel 27 übergreift den Kontakthebel 10 und hält hier- durch die Berührung zwischen der Wälzfläche 22 und der Auflagefläche 23 aufrecht. Zugleich sorgt der Haltebügel 27 dafür, daß der Kontakthebel 10 nicht parallel zu der Auflagefläche 23 verschoben werden kann.Details of the movable part of the switching contact arrangement 3 are explained below with reference to FIG. 2. The contact lever carrier 7 consists of a pole insulating body 17 made of insulating plastic to be connected to the coupling linkage 16 and side walls 20 made of sheet metal attached to the pole insulating body 17 on both sides. The contact lever 10 shown is provided with a contact pad 21 on its contacting side 18 facing the fixed switching contact 5. On its side opposite the contacting side 18 The rear side of the contact lever 10 has a rolling surface 22, which rests on a bearing surface 23 of the pole insulating body 17. As shown, the rolling surface 22 is designed with a negative curvature, while the bearing surface 23 has a positive curvature, namely with a smaller radius of curvature. The contact lever 10 can therefore be pivoted relative to the insulating body 17 in the direction of an arrow 25 against the action of two contact force springs 24 arranged in parallel. In this way, a contact force of the desired magnitude arises between the contact support 21 and the fixed switch contact 5 when the movable switch contact 6 is actuated by the drive device 14 about a pivot bearing 26 indicated in FIG. A holding bracket 27 engages over the contact lever 10 and thereby maintains contact between the rolling surface 22 and the support surface 23. At the same time, the holding bracket 27 ensures that the contact lever 10 cannot be moved parallel to the bearing surface 23.
Wie dies an sich bekannt ist, können in jedem Pol des Leistungsschalters 1 mehrere Kontakthebel 10 parallel zueinander angeordnet sein. In der Schnittdarstellung gemäß der Figur 3 sind als Beispiel fünf parallele Kontakthebel 10 im Schnitt gezeigt. Der Haltebügel 27 ist für alle Kotakthebel 10 ge- meinsam und besitzt angeformte Trennstege 30, die als Abstandhalter für die benachbarten Kontakthebel 10 wirken. Mit außenliegenden Zapfen 31 greift der Haltebügel 27 in Lagerδffnungen 32 der Seitenwände 20 des Kontakthebelträgers 17 ein. Daher vermag der Haltebügel 27 an der Schwenkbewegung der Kontakthebel 10 relativ zu dem Polisolierkδrper 17 teilzunehmen. In der Figur 3 ist ferner ein fest mit den Seiten- wänden 20 verbundener isolierender Abschir kδrper 33 gezeigt, der den unterhalb der Kontaktauflagen 21 befindlichen Bereich des bewegbaren Schaltkontaktes 6 gegen den Einfluß von Lichtbogengasen abschirmt (vgl. DE 295 03 327 Ul) .As is known per se, a plurality of contact levers 10 can be arranged parallel to one another in each pole of the circuit breaker 1. In the sectional view according to FIG. 3, five parallel contact levers 10 are shown in section as an example. The holding bracket 27 is common to all contact levers 10 and has integrally formed separating webs 30 which act as spacers for the adjacent contact levers 10. With external pins 31, the holding bracket 27 engages in bearing openings 32 in the side walls 20 of the contact lever carrier 17. Therefore, the bracket 27 can participate in the pivoting movement of the contact lever 10 relative to the Polisolierkδrper 17. In Figure 3 is also a fixed with the side Walls 20 connected insulating shield 33 shown that shields the area of the movable switching contact 6 located below the contact pads 21 against the influence of arcing gases (see. DE 295 03 327 Ul).
Wie näher der Figur 4 zu entnehmen ist, sind die Kontakthebel 10 jeweils an ihrer kontaktgebenden Seite 18 mit einer der Wälzfläche 22 gegenüberliegenden Haltenase 34 versehen, die von dem im Querschnitt U-förmigen Haltebügel 27 übergriffen werden. Im Bereich der Auflagefläche 23 ist in der Figur 4 ferner als weitere Ausgestaltung eine Metallplatte 35 gezeigt, die in das Material des Polisolierkδrpers 17 eingebettet ist, um die Lebensdauer der Auflagefläche 23 zu erhöhen.As can be seen in more detail in FIG. 4, the contact levers 10 are each provided on their contacting side 18 with a retaining lug 34 opposite the rolling surface 22, which are overlapped by the retaining bracket 27 with a U-shaped cross section. In the area of the support surface 23, a further embodiment is shown in FIG. 4 as a metal plate 35 which is embedded in the material of the pole insulating body 17 in order to increase the service life of the support surface 23.
Wie insbesondere die Figuren 2 und 4 zeigen, kann der Krümmungsradius der Wälzfläche 22 und der zugehörigen Auflagefläche 23 wesentlich größer bemessen werden, als dies bei einer Gelenkanordnung mit einem die Kontakthebel durchsetzenden Lagerbolzen möglich ist. Hierdurch ist die Berührungsfläche zwischen den genannten Flächen relativ groß. Daher ergibt sich eine vorteilhaft geringe spezifische Beanspruchung der zusammenwirkenden Teile. Eine Erwärmung des Kotakthebels 10 bei der Anbringng der biegsamen Leiter 11 {Figur 1 und Figur 2) wirkt sich daher weniger abträglich auf die Lebensdauer der Gelenkanordnung aus als bei bisher gebräuchlichen Schaltkontaktanordnungen. Durch den Wegfall einer Lagerδffnung in den Kontakthebeln 10 steht der volle Querschnitt für die Stromübertragung zur Verfügung. As particularly shown in Figures 2 and 4, the radius of curvature of the rolling surface 22 and the associated support surface 23 can be dimensioned much larger than is possible in a joint arrangement with a bearing pin passing through the contact lever. As a result, the contact surface between the surfaces mentioned is relatively large. This results in an advantageously low specific stress on the interacting parts. Heating the contact lever 10 when the flexible conductor 11 is attached (FIG. 1 and FIG. 2) therefore has a less detrimental effect on the life of the joint arrangement than in the case of previously used switch contact arrangements. By eliminating a bearing opening in the contact levers 10, the full cross section is available for the current transmission.
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97933631A EP0910858B1 (en) | 1996-07-12 | 1997-07-09 | Switching contact arrangement with a hinge arrangement for a contact lever |
| DE59702407T DE59702407D1 (en) | 1996-07-12 | 1997-07-09 | SWITCHING CONTACT ARRANGEMENT WITH A JOINT ARRANGEMENT FOR A CONTACT LEVER |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19629482A DE19629482C1 (en) | 1996-07-12 | 1996-07-12 | Low-voltage (LV) circuit breaker switch contact design |
| DE19629482.7 | 1996-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998002892A1 true WO1998002892A1 (en) | 1998-01-22 |
Family
ID=7800468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/DE1997/001472 Ceased WO1998002892A1 (en) | 1996-07-12 | 1997-07-09 | Switching contact arrangement with a hinge arrangement for a contact lever |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0910858B1 (en) |
| DE (2) | DE19629482C1 (en) |
| WO (1) | WO1998002892A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10149020C1 (en) * | 2001-09-28 | 2003-01-16 | Siemens Ag | Contact set for LV switching device has cooperating contours between contact lever and contact carrier in vicinity of bearing pin for ensuring smooth pivot movement of contact lever |
| DE10148947C1 (en) * | 2001-09-28 | 2003-02-13 | Siemens Ag | Switch contact arrangement of a low-voltage circuit breaker |
| DE102014107630B4 (en) * | 2014-05-30 | 2020-01-30 | Eaton Intelligent Power Limited | Circuit breaker with improved isolation of the control shaft |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0225207A1 (en) * | 1985-10-31 | 1987-06-10 | Merlin Gerin | Cinematic transmission chain between the control mechanism and the poles of an electric circuit breaker with a moulded insulating casing |
| US5093988A (en) * | 1991-01-24 | 1992-03-10 | Kohler Co. | Method for attaching a flexible connector |
| DE4416105C1 (en) * | 1994-04-19 | 1995-05-24 | Siemens Ag | LV power switch |
| DE4416104A1 (en) * | 1994-04-19 | 1995-10-26 | Siemens Ag | Switch contact arrangement of an electrical circuit breaker |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29503327U1 (en) * | 1995-02-16 | 1995-04-13 | Siemens AG, 80333 München | Contact lever assembly for a low voltage circuit breaker |
-
1996
- 1996-07-12 DE DE19629482A patent/DE19629482C1/en not_active Expired - Fee Related
-
1997
- 1997-07-09 DE DE59702407T patent/DE59702407D1/en not_active Expired - Fee Related
- 1997-07-09 WO PCT/DE1997/001472 patent/WO1998002892A1/en not_active Ceased
- 1997-07-09 EP EP97933631A patent/EP0910858B1/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0225207A1 (en) * | 1985-10-31 | 1987-06-10 | Merlin Gerin | Cinematic transmission chain between the control mechanism and the poles of an electric circuit breaker with a moulded insulating casing |
| US5093988A (en) * | 1991-01-24 | 1992-03-10 | Kohler Co. | Method for attaching a flexible connector |
| DE4416105C1 (en) * | 1994-04-19 | 1995-05-24 | Siemens Ag | LV power switch |
| DE4416104A1 (en) * | 1994-04-19 | 1995-10-26 | Siemens Ag | Switch contact arrangement of an electrical circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19629482C1 (en) | 1997-09-11 |
| DE59702407D1 (en) | 2000-11-02 |
| EP0910858B1 (en) | 2000-09-27 |
| EP0910858A1 (en) | 1999-04-28 |
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