EP1357567B1 - Driving device for the spring energy accumulator of an electric switch - Google Patents

Driving device for the spring energy accumulator of an electric switch Download PDF

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Publication number
EP1357567B1
EP1357567B1 EP20030090101 EP03090101A EP1357567B1 EP 1357567 B1 EP1357567 B1 EP 1357567B1 EP 20030090101 EP20030090101 EP 20030090101 EP 03090101 A EP03090101 A EP 03090101A EP 1357567 B1 EP1357567 B1 EP 1357567B1
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EP
European Patent Office
Prior art keywords
drive shaft
cam
motor
spring energy
drive
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EP20030090101
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German (de)
French (fr)
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EP1357567A2 (en
EP1357567A3 (en
Inventor
Jörg-Uwe DAHL
Marc Liebetruth
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Siemens AG
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Siemens AG
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Publication of EP1357567A3 publication Critical patent/EP1357567A3/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor

Definitions

  • the invention relates to a drive device for a spring accumulator of an electrical switch comprising a motor, a drive shaft rotatable by the motor in a clamping direction, a cam coupled to the drive shaft, at the contour thereof during a clamping phase of the spring accumulator coupled to the spring accumulator Clamping element is driven, and at least one coupled to the drive shaft control disc for controlling the motor comprises.
  • the invention relates to an electrical switch, in particular a low-voltage circuit breaker with a spring accumulator, in which such a drive device is used to tension the spring accumulator.
  • a generic drive device is known from US Pat. No. 4,649,244, in which the actuation of a microswitch for switching on and off an engine can be controlled as a function of the position of a cam disc fixedly coupled to the drive shaft.
  • a control disk in the form of a circular toothed disk is fixedly coupled to the drive shaft, which has a driver for actuating the microswitch.
  • the driver acts via a rotatable lever on an actuator of the microswitch. With the actuation of the lever by the driver in this case also a brake system for the engine, or a mechanical decoupling of the motor can be activated by the drive shaft.
  • the drive shaft which during a tension phase of the spring accumulator, with which the engine turned on and the brake system is deactivated, rotates under the force of the motor in a clamping direction, is further accelerated during a Verklinkungsphase the spring accumulator under the force of the spring accumulator in the clamping direction.
  • This accelerated movement of the cam may cause the brake system for the engine to be activated before the engine is effectively shut down. In this case, directed against the still active engine power braking force can lead to damage to the moving parts of the engine or damage due to overheating of the engine.
  • the invention Based on a drive device with the features of the preamble of claim 1 (US 4,649,244), the invention has the object to design the drive device so that it provides the necessary motor drive power for several clamping cycles of the spring accumulator safely available.
  • this object is achieved in that the couplings of cam and control disk are designed with the drive shaft such that after passing through the clamping phase, the cam in the clamping direction of the control disk can at least a little way ahead.
  • a braking system is to be understood as any system which leads to a shutdown of the moving parts of the engine coupled to the drive shaft.
  • a system may include, for example, a per se known circuit arrangement for short-circuit braking of the engine.
  • the control disk is not accelerated in contrast to the drive shaft under the force of the spring accumulator.
  • switches for controlling the motor such as a first switch for switching on and off, a second switch for activating and deactivating a brake system or for mechanical decoupling and coupling of the motor to the drive shaft, can be actuated successively in time such that
  • the activation of the braking system or the mechanical decoupling of the motor from the drive shaft before the effective switching off of the engine and on the other hand the switching on of the engine is still prevented with still activated braking system or not yet completed mechanical coupling of the motor to the drive shaft.
  • a mechanically simple embodiment of the new drive device provides that the control disk is fixed and the cam with limited angular play are connected to the drive shaft. -
  • the value of the angular play should preferably be more than 5 °.
  • a further preferred embodiment provides that in addition to the drive shaft, a transport disk is coupled, which during a relaxation phase of the spring accumulator under the force of the spring accumulator on the Contour of the transport disc, the drive shaft rotates so far that the value of the angular clearance in the clamping direction of the drive shaft is zero.
  • the low-voltage circuit breaker according to FIG. 1 has a housing 1 which serves to receive a contact arrangement consisting of a movable contact 2 and a fixed contact 3, an arc extinguishing chamber 4 and a drive mechanism 6 supported on a supporting structure 5.
  • the drive mechanism 6 serves for actuating the movable contact 2, which has a plurality of contact levers 8 which are supported in a pivotable contact carrier 7 and arranged parallel to one another (only one contact lever is visible in the figure).
  • the contact lever 8 are pivotally mounted in a known manner by means of a hinge pin 9 in the contact carrier 7 and biased by two contact force springs 10. Flexible conductors 11 are used to connect the Contact lever 8 with a lower connection rail 12.
  • the fixed contact 3 assigned to the movable contact 2 of the contact arrangement is connected to an upper connection rail 13.
  • the drive mechanism has a drive train consisting of a first coupling linkage 14 and a second coupling linkage 15 and a switching shaft 16 for the movable contact 2.
  • the drive mechanism includes a spring memory 17 by means of which the energy for switching on and off of the switch, ie for closing and opening the contacts 2, 3 can be stored, a latching mechanism 18 for latching the spring latch 17 in its cocked state or for latching Drive train at decided contacts 2, 3 and a drive device 19 for tensioning the spring accumulator 17.
  • the drive device is coupled in the manner known from the publication DE 100 29 123 A1 during a clamping phase of the spring accumulator via a lever system 20 with the spring accumulator and decoupled during a Verklinkungsphase of the spring accumulator of the lever system.
  • the latching of the spring accumulator 17 in its tensioned state takes place in contrast to the known from US Patent 4,649,244 drive mechanism not by means of a cam which is used to tension the spring accumulator, but after decoupling of the lever system of the cam separately by the switching mechanism 18th
  • the drive device 19 comprises a motor 21, a drive shaft 22 driven by the motor 21, a cam disk 24 coupled at its pivot point to the drive shaft 22, a control disk 26 fixed at its pivot point to the drive shaft 22, and two microswitches 27, 28 for controlling the motor.
  • the control disk 26 has two each with a cam 29, 30 provided, offset in the axial direction of the drive shaft 22 arranged portions 31, 32, wherein each section 31, 32 of the microswitch 27, 28 is associated.
  • the first microswitch 27 power switch
  • the motor 21 When the first microswitch 27 (power switch) is closed, an operating voltage is applied to the motor 21, whereby the motor is switched on.
  • the first microswitch 27 When the first microswitch 27 is open, the motor 21 is disconnected from its operating voltage and thus switched off.
  • the second microswitch 28 closed short-circuit switch
  • the motor 21 is short-circuited, whereby the mechanical residual energy of its moving parts is consumed by the short-circuit power and the moving parts of the engine quickly come to a standstill.
  • the second micro-switch 28 When the second micro-switch 28 is open, the motor 21 is not short-circuited.
  • FIG. 2 shows the drive device in its initial position, in which the first microswitch 27 is closed and the second microswitch 28 is opened and thus the motor 21 is switched on, but not short-circuited.
  • the drive shaft 22 therefore rotates during the clamping phase of the spring accumulator 17 under the force of the motor 21 in a clamping direction 33 by a first angle i to the position shown in FIG. Due to the slope of a first portion 34 of the contour of the cam disk, the lever system 20, which rests on its role 35 on the contour of the cam, is stretched during this clamping phase of the spring accumulator so that the one lever 36 of the lever system pivots in the direction of arrow 37 and the spring accumulator 17 tensioned.
  • At the first portion 34 of the contour of the cam is formed as a recessed edge formed second portion 38 at.
  • the transition of the roller 35 to this second section 38 causes the cam 24 is further accelerated under the force of the spring accumulator 17 in its clamping direction 33.
  • the cam plate 24 While the control disk 26 is fixedly arranged on the drive shaft 22, the cam plate 24 is coupled via a wedge-shaped tongue and groove connection with an angular play ⁇ of about 15 ° to 20 ° to the drive shaft 22.
  • a first surface 39 of the spring 40 of the cam engages a first surface 41 of the groove 42 of the drive shaft.
  • the cam 24 is associated with a safety gear 45 in the form of a brake spring, which absorbs the mechanical residual energy of the cam after its decoupling from the lever system so far that it is ensured that at the end of the leading rotation of the cam relative to the drive shaft and thus with respect to the control disk itself when creating the second surface 45 of the spring 40 on the second surface 46 of the groove 42 (see Figure 4) does not lead to an acceleration of the drive shaft or the control disk.
  • a safety gear 45 in the form of a brake spring, which absorbs the mechanical residual energy of the cam after its decoupling from the lever system so far that it is ensured that at the end of the leading rotation of the cam relative to the drive shaft and thus with respect to the control disk itself when creating the second surface 45 of the spring 40 on the second surface 46 of the groove 42 (see Figure 4) does not lead to an acceleration of the drive shaft or the control disk.
  • the transport disc 47 is fixedly arranged in its pivot point on the drive shaft 22 and has a first contour portion 49, which is similar to the known from DE 100 29 123 A1 third section 48 of the contour of the cam designed.
  • the drive shaft 22 is renewed with the lever system 20 coupled.
  • This coupling takes place by means of the transport disc 47, on the contour of which a pin 50 of the lever system acts under the force of the relaxing spring accumulator 17.
  • the transport disk 47 is first rotated by a third angle k in the clamping direction 33 of the drive shaft 22 until the first surface 39 of the spring 40 of the cam again comes into abutment with the first surface 41 of the groove 42 of the drive shaft and thus the value of the angle Play ⁇ in the clamping direction 33 of the drive shaft is 0.
  • the new drive device thus has the advantage that the acceleration of the cam 24, which depends in particular on the force of the spring accumulator 17, does not directly affect the timing of the engine 21. As a result, a short-circuiting of the motor with the operating voltage (mains voltage) of the motor is reliably prevented.
  • the time interval between the two switching operations of the microswitch can be increased by three to ten times in the new drive device compared to the drive device known from DE 100 29 123 A1. This makes it possible, in particular with limited space available for accommodating the microswitch space to arrange the microswitch with respect to the period of their operation even closer to each other.

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  • Valve Device For Special Equipments (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Description

Die Erfindung bezieht sich auf eine Antriebsvorrichtung für einen Federspeicher eines elektrischen Schalters, die einen Motor, eine durch den Motor in einer Spann-Richtung drehbare Antriebswelle, eine an die Antriebswelle gekoppelte Kurvenscheibe, an deren Kontur während einer Spannphase des Federspeichers ein an den Federspeicher gekoppeltes Spannelement antreibbar ist, und zumindest eine an die Antriebswelle gekoppelte Steuerscheibe zur Steuerung des Motors umfasst.The invention relates to a drive device for a spring accumulator of an electrical switch comprising a motor, a drive shaft rotatable by the motor in a clamping direction, a cam coupled to the drive shaft, at the contour thereof during a clamping phase of the spring accumulator coupled to the spring accumulator Clamping element is driven, and at least one coupled to the drive shaft control disc for controlling the motor comprises.

Weiterhin bezieht sich die Erfindung auf einen elektrischen Schalter, insbesondere einen Niederspannungs-Leistungsschalter mit einem Federspeicher, bei dem eine derartige Antriebsvorrichtung zum Spannen des Federspeichers dient.Furthermore, the invention relates to an electrical switch, in particular a low-voltage circuit breaker with a spring accumulator, in which such a drive device is used to tension the spring accumulator.

Eine gattungsgemäße Antriebsvorrichtung ist aus der US-Patentschrift 4,649,244 bekannt, bei der in Abhängigkeit von der Stellung einer fest mit der Antriebswelle gekoppelten Kurvenscheibe das Betätigen eines Mikroschalters zum An- und Ausschalten eines Motors steuerbar ist. Hierzu ist an die Antriebswelle eine Steuerscheibe in Form einer Umlauf-Zahnscheibe fest angekoppelt, die einen Mitnehmer zum Betätigen des Mikroschalters aufweist. Dabei wirkt der Mitnehmer über einen drehbaren Hebel auf einen Betätiger des Mikroschalters. Mit der Betätigung des Hebels durch den Mitnehmer kann hierbei auch ein Bremssystem für den Motor, oder eine mechanische Entkopplung des Motors von der Antriebswelle aktiviert werden. - Die Antriebswelle, die während einer Spannphase des Federspeichers, bei der der Motor angeschaltet und das Bremssystem deaktiviert ist, unter der Kraft des Motors in eine Spann-Richtung dreht, wird während einer Verklinkungsphase des Federspeichers unter der Kraft des Federspeichers in der Spann-Richtung beschleunigt weitergedreht. Diese beschleunigte Bewegung der Kurvenscheibe kann dazu führen, dass das Bremssystem für den Motor schon aktiviert wird, bevor der Motor wirksam ausgeschaltet ist. Dabei kann die gegen die noch aktive Motorkraft gerichtete Bremskraft zu einer Beschädigung der beweglichen Teile des Motors oder zu Schäden aufgrund eines Überhitzens des Motors führen. Derartige Schäden können dazu führen, dass während einer sich anschließenden Entspannungsphase des Federspeichers - bei der zwar durch ein Weiterdrehen der Steuerscheibe unter der Kraft des sich entspannenden Federspeichers das Bremssystems deaktiviert oder der Motor erneut mechanisch angekoppelt und anschließend der Motor wieder angeschaltet wird - die notwendige motorische Antriebskraft für einen erneuten Spannzyklus des Federspeichers jedoch durch den geschädigten Motor nicht mehr zur Verfügung steht.A generic drive device is known from US Pat. No. 4,649,244, in which the actuation of a microswitch for switching on and off an engine can be controlled as a function of the position of a cam disc fixedly coupled to the drive shaft. For this purpose, a control disk in the form of a circular toothed disk is fixedly coupled to the drive shaft, which has a driver for actuating the microswitch. The driver acts via a rotatable lever on an actuator of the microswitch. With the actuation of the lever by the driver in this case also a brake system for the engine, or a mechanical decoupling of the motor can be activated by the drive shaft. - The drive shaft, which during a tension phase of the spring accumulator, with which the engine turned on and the brake system is deactivated, rotates under the force of the motor in a clamping direction, is further accelerated during a Verklinkungsphase the spring accumulator under the force of the spring accumulator in the clamping direction. This accelerated movement of the cam may cause the brake system for the engine to be activated before the engine is effectively shut down. In this case, directed against the still active engine power braking force can lead to damage to the moving parts of the engine or damage due to overheating of the engine. Such damage can lead to the necessary motor power during a subsequent relaxation phase of the spring accumulator - in which deactivated by a further rotation of the control disc under the force of the relaxing spring accumulator, the brake system or the engine again mechanically coupled and then the engine is switched on again Driving force for a renewed clamping cycle of the spring accumulator, however, is no longer available due to the damaged motor.

Ausgehend von einer Antriebsvorrichtung mit den Merkmalen des Oberbegriffes des Anspruches 1 (US 4,649,244) liegt der Erfindung die Aufgabe zugrunde, die Antriebsvorrichtung so zu gestalten, dass sie die notwendige motorische Antriebskraft für mehrere Spannzyklen des Federspeichers sicher zur Verfügung stellt.Based on a drive device with the features of the preamble of claim 1 (US 4,649,244), the invention has the object to design the drive device so that it provides the necessary motor drive power for several clamping cycles of the spring accumulator safely available.

Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, dass die Kopplungen von Kurvenscheibe und Steuerscheibe mit der Antriebswelle derart gestaltet sind, dass nach Durchlaufen der Spannphase die Kurvenscheibe in der Spann-Richtung der Steuerscheibe wenigstens ein Stück weit voreilen kann.According to the invention, this object is achieved in that the couplings of cam and control disk are designed with the drive shaft such that after passing through the clamping phase, the cam in the clamping direction of the control disk can at least a little way ahead.

Im Sinne der Erfindung soll unter einem Bremssystem jedes System verstanden werden, das zu einer Stillsetzung der an die Antriebswelle gekoppelten beweglichen Teile des Motors führt. Ein derartiges System kann beispielsweise eine an sich bekannte Schaltungsanordnung zur Kurzschlussbremsung des Motors umfassen.For the purposes of the invention, a braking system is to be understood as any system which leads to a shutdown of the moving parts of the engine coupled to the drive shaft. Such a system may include, for example, a per se known circuit arrangement for short-circuit braking of the engine.

Bei einer Ausgestaltung der Antriebsvorrichtung gemäß dem Kennzeichen des Anspruches 1 wird die Steuerscheibe im Gegensatz zur Antriebswelle unter der Kraft des Federspeichers nicht beschleunigt. Auch räumlich eng angeordnete Schalter zur Steuerung des Motors wie beispielsweise ein erster Schalter zum An- und Ausschalten, ein zweiter Schalter zum Aktivieren und Deaktivieren eines Bremssystems oder zum mechanischen Ent- und Ankoppeln des Motors an die Antriebswelle können hierbei zeitlich aufeinanderfolgend so betätigt werden, dass zum Einen beispielsweise das Aktivieren des Bremssystems oder das mechanische Entkoppeln des Motors von der Antriebswelle vor dem wirksamen Ausschalten des Motors und zum Anderen das Einschalten des Motors bei noch aktiviertem Bremssystem oder noch nicht abgeschlossener mechanischer Ankopplung des Motors an die Antriebswelle sicher verhindert ist.In one embodiment of the drive device according to the characterizing part of claim 1, the control disk is not accelerated in contrast to the drive shaft under the force of the spring accumulator. Even spatially closely arranged switches for controlling the motor, such as a first switch for switching on and off, a second switch for activating and deactivating a brake system or for mechanical decoupling and coupling of the motor to the drive shaft, can be actuated successively in time such that On the one hand, for example, the activation of the braking system or the mechanical decoupling of the motor from the drive shaft before the effective switching off of the engine and on the other hand, the switching on of the engine is still prevented with still activated braking system or not yet completed mechanical coupling of the motor to the drive shaft.

Eine mechanisch einfache Ausgestaltungsform der neuen Antriebsvorrichtung sieht vor, dass die Steuerscheibe fest und die Kurvenscheibe mit begrenztem Winkel-Spiel mit der Antriebswelle verbunden sind. - Der Wert des Winkelspieles sollte bevorzugt mehr als 5° betragen.A mechanically simple embodiment of the new drive device provides that the control disk is fixed and the cam with limited angular play are connected to the drive shaft. - The value of the angular play should preferably be more than 5 °.

Eine weitere bevorzugte Ausgestaltungsform sieht vor, dass an die Antriebswelle zusätzlich eine Transportscheibe gekoppelt ist, die während einer Entspannungsphase des Federspeichers unter der Krafteinwirkung des Federspeichers auf die Kontur der Transportscheibe die Antriebswelle soweit dreht, dass der Wert des Winkel-Spieles in Spann-Richtung der Antriebswelle Null ist. - Durch eine derartige Ausgestaltung kann sichergestellt werden, dass alle Elemente der Antriebsvorrichtung am Ende der Entspannungsphase des Federspeichers eine definierte Ausgangsstellung für einen erneuten Spannzyklus des Federspeichers einnehmen.A further preferred embodiment provides that in addition to the drive shaft, a transport disk is coupled, which during a relaxation phase of the spring accumulator under the force of the spring accumulator on the Contour of the transport disc, the drive shaft rotates so far that the value of the angular clearance in the clamping direction of the drive shaft is zero. - By such a configuration can be ensured that all elements of the drive device occupy a defined starting position for a renewed clamping cycle of the spring accumulator at the end of the relaxation phase of the spring accumulator.

Ein Ausführungsbeispiel eines elektrischen Schalters in Form eines Niederspannungs-Leistungsschalters mit der neuen Antriebsvorrichtung ist in den Figuren 1 bis 5 dargestellt. Dabei zeigen

  • Figur 1 einen schematisch dargestellten Niederspannungs-Leistungsschalter mit einem Antriebsmechanismus, der einen Federspeicher, ein Schaltschloss zum Verklinken des Federspeichers und eine Antriebsvorrichtung zum Spannen des Federspeichers aufweist und
  • Figuren 2 bis 5 die Antriebsvorrichtung in fünf verschiedenen Phasen ihres Bewegungsablaufes.
An embodiment of an electrical switch in the form of a low-voltage circuit breaker with the new drive device is shown in Figures 1 to 5. Show
  • Figure 1 is a schematically illustrated low-voltage circuit breaker with a drive mechanism having a spring accumulator, a latching mechanism for latching the spring accumulator and a drive device for tensioning the spring accumulator and
  • Figures 2 to 5, the drive device in five different phases of their movement.

Der Niederspannungs-Leistungsschalter gemäß der Figur 1 weist ein Gehäuse 1 auf, das zur Aufnahme einer - aus einem beweglichen Kontakt 2 und einem feststehenden Kontakt 3 bestehenden - Kontaktanordnung, einer Lichtbogenlöschkammer 4 und eines an einem Tragwerk 5 abgestützten Antriebsmechanismus 6 dient. Der Antriebsmechanismus 6 dient hierbei zur Betätigung des beweglichen Kontaktes 2, der mehrere in einem schwenkbaren Kontaktträger 7 abgestützte und parallel zueinander angeordnete Kontakthebel 8 (in der Figur ist nur ein Kontakthebel sichtbar) aufweist. Die Kontakthebel 8 sind in bekannter Weise mittels eines Gelenkbolzens 9 in dem Kontaktträger 7 schwenkbar angebracht und durch je zwei Kontaktkraftfedern 10 vorgespannt. Biegsame Leiter 11 dienen zur Verbindung der Kontakthebel 8 mit einer unteren Anschluss-Schiene 12. Der dem beweglichen Kontakt 2 der Kontaktanordnung zugeordnete feststehende Kontakt 3 ist mit einer oberen Anschluss-Schiene 13 verbunden. Der Antriebsmechanismus weist einen aus einem ersten Koppelgestänge 14 und einem zweiten Koppelgestänge 15 sowie einer Schaltwelle 16 bestehenden Antriebsstrang für den beweglichen Kontakt 2 auf. Weiterhin gehören zu dem Antriebsmechanismus ein Federspeicher 17 mittels dessen die Energie zum Ein- und Ausschalten des Schalters, d. h. zum Schließen und Öffnen der Kontakte 2, 3 speicherbar ist, ein Schaltschloss 18 zum Verklinken des Federspeichers 17 in seinem gespannten Zustand bzw. zum Verklinken des Antriebsstranges bei beschlossenen Kontakten 2, 3 sowie eine Antriebsvorrichtung 19 zum Spannen des Federspeichers 17 auf. Dabei ist die Antriebsvorrichtung in der aus der Druckschrift DE 100 29 123 A1 bekannten Weise während einer Spannphase des Federspeichers über ein Hebelsystem 20 mit dem Federspeicher gekoppelt und während einer Verklinkungsphase des Federspeichers von dem Hebelsystem entkoppelt. Das Verklinken des Federspeichers 17 in seinem gespannten Zustand erfolgt dabei im Gegensatz zu dem aus der US-Patentschrift 4,649,244 bekannten Antriebsmechanismus nicht mittels einer Kurvenscheibe, die zum Spannen des Federspeichers dient, sondern nach Entkopplung des Hebelsystems von der Kurvenscheibe separat durch das Schaltschloss 18.The low-voltage circuit breaker according to FIG. 1 has a housing 1 which serves to receive a contact arrangement consisting of a movable contact 2 and a fixed contact 3, an arc extinguishing chamber 4 and a drive mechanism 6 supported on a supporting structure 5. The drive mechanism 6 serves for actuating the movable contact 2, which has a plurality of contact levers 8 which are supported in a pivotable contact carrier 7 and arranged parallel to one another (only one contact lever is visible in the figure). The contact lever 8 are pivotally mounted in a known manner by means of a hinge pin 9 in the contact carrier 7 and biased by two contact force springs 10. Flexible conductors 11 are used to connect the Contact lever 8 with a lower connection rail 12. The fixed contact 3 assigned to the movable contact 2 of the contact arrangement is connected to an upper connection rail 13. The drive mechanism has a drive train consisting of a first coupling linkage 14 and a second coupling linkage 15 and a switching shaft 16 for the movable contact 2. Furthermore, the drive mechanism includes a spring memory 17 by means of which the energy for switching on and off of the switch, ie for closing and opening the contacts 2, 3 can be stored, a latching mechanism 18 for latching the spring latch 17 in its cocked state or for latching Drive train at decided contacts 2, 3 and a drive device 19 for tensioning the spring accumulator 17. The drive device is coupled in the manner known from the publication DE 100 29 123 A1 during a clamping phase of the spring accumulator via a lever system 20 with the spring accumulator and decoupled during a Verklinkungsphase of the spring accumulator of the lever system. The latching of the spring accumulator 17 in its tensioned state takes place in contrast to the known from US Patent 4,649,244 drive mechanism not by means of a cam which is used to tension the spring accumulator, but after decoupling of the lever system of the cam separately by the switching mechanism 18th

Gemäß der Figuren 2 bis 5 umfasst die Antriebsvorrichtung 19 einen Motor 21, eine durch den Motor 21 angetriebene Antriebswelle 22, einen in ihrem Drehpunkt an die Antriebswelle 22 gekoppelte Kurvenscheibe 24, eine in ihrem Drehpunkt fest an die Antriebswelle 22 gekoppelte Steuerscheibe 26 sowie zwei Mikroschalter 27, 28 zur Steuerung des Motors. Hierbei weist die Steuerscheibe 26 zwei jeweils mit einem Nocken 29, 30 versehene, in axialer Richtung der Antriebswelle 22 versetzt angeordnete Abschnitte 31, 32 auf, wobei jedem Abschnitt 31, 32 einer der Mikroschalter 27, 28 zugeordnet ist.According to FIGS. 2 to 5, the drive device 19 comprises a motor 21, a drive shaft 22 driven by the motor 21, a cam disk 24 coupled at its pivot point to the drive shaft 22, a control disk 26 fixed at its pivot point to the drive shaft 22, and two microswitches 27, 28 for controlling the motor. In this case, the control disk 26 has two each with a cam 29, 30 provided, offset in the axial direction of the drive shaft 22 arranged portions 31, 32, wherein each section 31, 32 of the microswitch 27, 28 is associated.

Bei geschlossenem ersten Mikroschalter 27 (Netzschalter) liegt am Motor 21 eine Betriebsspannung an, wodurch der Motor eingeschaltet ist. Bei geöffnetem ersten Mikroschalter 27 ist der Motor 21 von seiner Betriebsspannung getrennt und damit ausgeschaltet. Bei geschlossenem zweiten Mikroschalter 28 (Kurzschluss-Schalter) ist der Motor 21 kurzgeschlossen, wodurch die mechanische Restenergie seiner beweglichen Teile durch die Kurzschluss-Leistung verbraucht wird und die beweglichen Teile des Motors schnell zum Stillstand kommen. Bei geöffnetem zweiten Mikroschalter 28 ist der Motor 21 nicht kurzgeschlossen.When the first microswitch 27 (power switch) is closed, an operating voltage is applied to the motor 21, whereby the motor is switched on. When the first microswitch 27 is open, the motor 21 is disconnected from its operating voltage and thus switched off. With the second microswitch 28 closed (short-circuit switch), the motor 21 is short-circuited, whereby the mechanical residual energy of its moving parts is consumed by the short-circuit power and the moving parts of the engine quickly come to a standstill. When the second micro-switch 28 is open, the motor 21 is not short-circuited.

Die Figur 2 zeigt die Antriebsvorrichtung in ihrer AusgangsStellung, bei der der erste Mikroschalter 27 geschlossen und der zweite Mikroschalter 28 geöffnet ist und somit der Motor 21 angeschaltet, jedoch nicht kurzgeschlossen ist. Die Antriebswelle 22 dreht sich daher während der Spannphase des Federspeichers 17 unter der Kraft des Motors 21 in einer Spannrichtung 33 um einen ersten Winkel i bis in die Figur 3 dargestellte Stellung. Durch die Steigung eines ersten Abschnittes 34 der Kontur der Kurvenscheibe wird während dieser Spannphase des Federspeichers das Hebelsystem 20, das über seine Rolle 35 an der Kontur der Kurvenscheibe anliegt, derart gestreckt, dass der eine Hebel 36 des Hebelsystems in Richtung des Pfeiles 37 schwenkt und den Federspeicher 17 spannt. An den ersten Abschnitt 34 der Kontur der Kurvenscheibe schließt sich ein als rückspringende Kante ausgebildeter zweiter Abschnitt 38 an. Der Übergang der Rolle 35 auf diesen zweiten Abschnitt 38 bewirkt, dass die Kurvenscheibe 24 unter der Kraft des Federspeichers 17 in ihre Spannrichtung 33 beschleunigt weitergedreht wird. Während die Steuerscheibe 26 fest auf der Antriebswelle 22 angeordnet ist, ist die Kurvenscheibe 24 über eine keilförmige Nut-Feder-Verbindung mit einem Winkelspiel δ von etwa 15° bis 20° an die Antriebswelle 22 angekoppelt. Während der Spannphase des Federspeichers liegt eine erste Fläche 39 der Feder 40 der Kurvenscheibe an einer ersten Fläche 41 der Nut 42 der Antriebswelle an. Hierdurch verläuft das Winkelspiel δ der Kurvenscheibe gegenüber der Antriebswelle in Spannrichtung 33 der Antriebswelle, so dass zwar die Kurvenscheibe 24 beim Übergang in die Verklinkungsphase beschleunigt wird, nicht jedoch die Antriebswelle 22. Die Antriebswelle 22 und die fest auf ihr angeordnete Steuerscheibe 26 drehen sich lediglich unter der Kraft des Motors 21 um einen zweiten Winkel j weiter. Kurz nach Beginn der Verklinkungsphase gelangt dabei zuerst der Nocken 29 des ersten Abschnittes 31 in Anlage mit einem Betätiger 43 des ersten Mikroschalters 27, wodurch der Mikroschalter geöffnet, d. h. der Motor ausgeschaltet wird. Danach gelangt der Nocken 30 des zweiten Abschnittes 32 in Anlage mit dem Betätiger 44 des zweiten Mikroschalters 28, wodurch der zweite Mikroschalter geschlossen, d. h. der Motor kurzgeschlossen wird. Das gleichförmige Weiterdrehen der Steuerscheibe 26 garantiert dabei, dass der Zeitabstand zwischen den beiden Schaltvorgängen der Mikroschalter so groß ist, dass der Motor 21 von seiner Betriebsspannung sicher getrennt ist, bevor er kurzgeschlossen wird. Der Kurvenscheibe 24 ist eine Fangvorrichtung 45 in Form einer Bremsfeder zugeordnet, die die mechanische Restenergie der Kurvenscheibe nach ihrer Entkopplung von dem Hebelsystem so weit aufnimmt, dass sichergestellt ist, dass am Ende der vorlaufenden Drehung der Kurvenscheibe gegenüber der Antriebswelle und damit gegenüber der Steuerscheibe selbst bei einem Anlegen der zweiten Fläche 45 der Feder 40 an der zweiten Fläche 46 der Nut 42 (vgl. Figur 4) nicht zu einer Beschleunigung der Antriebswelle bzw. der Steuerscheibe führt.FIG. 2 shows the drive device in its initial position, in which the first microswitch 27 is closed and the second microswitch 28 is opened and thus the motor 21 is switched on, but not short-circuited. The drive shaft 22 therefore rotates during the clamping phase of the spring accumulator 17 under the force of the motor 21 in a clamping direction 33 by a first angle i to the position shown in FIG. Due to the slope of a first portion 34 of the contour of the cam disk, the lever system 20, which rests on its role 35 on the contour of the cam, is stretched during this clamping phase of the spring accumulator so that the one lever 36 of the lever system pivots in the direction of arrow 37 and the spring accumulator 17 tensioned. At the first portion 34 of the contour of the cam is formed as a recessed edge formed second portion 38 at. The transition of the roller 35 to this second section 38 causes the cam 24 is further accelerated under the force of the spring accumulator 17 in its clamping direction 33. While the control disk 26 is fixedly arranged on the drive shaft 22, the cam plate 24 is coupled via a wedge-shaped tongue and groove connection with an angular play δ of about 15 ° to 20 ° to the drive shaft 22. During the clamping phase of the spring accumulator, a first surface 39 of the spring 40 of the cam engages a first surface 41 of the groove 42 of the drive shaft. As a result, the angular play δ of the cam relative to the drive shaft in the clamping direction 33 of the drive shaft, so that although the cam 24 is accelerated at the transition to the Verklinkungsphase, but not the drive shaft 22. The drive shaft 22 and the fixedly arranged on her control disc 26 rotate only under the power of the motor 21 by a second angle j on. Shortly after the start of Verklinkungsphase thereby first reaches the cam 29 of the first section 31 into contact with an actuator 43 of the first microswitch 27, whereby the micro-switch is opened, that is, the engine is turned off. Thereafter, the cam 30 of the second section 32 comes into abutment with the actuator 44 of the second micro-switch 28, whereby the second micro-switch is closed, that is, the motor is short-circuited. The uniform further rotation of the control disk 26 guarantees that the time interval between the two switching operations of the micro-switch is so large that the motor 21 is safely separated from its operating voltage before it is short-circuited. The cam 24 is associated with a safety gear 45 in the form of a brake spring, which absorbs the mechanical residual energy of the cam after its decoupling from the lever system so far that it is ensured that at the end of the leading rotation of the cam relative to the drive shaft and thus with respect to the control disk itself when creating the second surface 45 of the spring 40 on the second surface 46 of the groove 42 (see Figure 4) does not lead to an acceleration of the drive shaft or the control disk.

Aus der DE 100 29 123 A1 ist bekannt, einen dritten Abschnitt 48 der Kontur der Kurvenscheibe 24 derart zu gestalten, dass er am Ende der Entspannungsphase des Federspeichers in Anlage mit der Rolle 35 gelangt und die Kurvenscheibe unter der Kraft des Federspeichers 17 um einen Differenzwinkel γ (vgl. Figur 5) in ihre Ausgangsstellung dreht. Eine derartige Gestaltung der Kurvenscheibe zur Rückstellung in ihre Ausgangsstellung kann auch bei der neuen Antriebsvorrichtung vorgesehen sein, wenn der verbleibende Differenzwinkel γ bis zum Erreichen der Ausgangsstellung der Kurvenscheibe noch so groß ist, dass nacheinander beide Mikroschalter durch die sich dabei mit der Kurvenscheibe und der Antriebswelle mitdrehenden Steuerscheibe betätigt werden. Je größer der Wert des Winkel-Spieles δ jedoch ist, desto geringer wird der verbleibende Differenzwinkel γ der Kurvenscheibe sein. Bei der in den Figuren gezeigten Antriebsvorrichtung ist eine derartige Steuerung der Rückstellung der Kurvenscheibe in ihre Ausgangsstellung etwa bis zu einem Wert des Winkel-Spieles δ von 20° sicher realisierbar. Bei einem Wert des Winkel-Spieles über 20° ist es vorteilhaft, das Rückstellen der Kurvenscheibe mittels einer Transportscheibe 47 zu realisieren. Hierzu ist die Transportscheibe 47 in ihrem Drehpunkt fest auf der Antriebswelle 22 angeordnet und weist einen ersten Konturabschnitt 49 auf, der ähnlich dem aus der DE 100 29 123 A1 bekannten dritten Abschnitt 48 der Kontur der Kurvenscheibe gestaltet ist.From DE 100 29 123 A1 it is known to make a third section 48 of the contour of the cam 24 so that it comes into contact with the roller 35 at the end of the relaxation phase of the spring accumulator and the cam disc under the force of the spring accumulator 17 by a differential angle γ (see Figure 5) rotates to its initial position. Such a design of the cam to return to its initial position may also be provided in the new drive device, if the remaining difference angle γ until reaching the starting position of the cam is still so large that successively both microswitch by the case with the cam and the drive shaft be rotated with rotating control disk. However, the greater the value of the angular clearance δ, the lower will be the remaining difference angle γ of the cam. In the case of the drive device shown in the figures, such a control of the return of the cam disk into its starting position can be reliably realized up to a value of the angular clearance δ of 20 °. With a value of the angle clearance over 20 °, it is advantageous to realize the return of the cam disk by means of a transport disk 47. For this purpose, the transport disc 47 is fixedly arranged in its pivot point on the drive shaft 22 and has a first contour portion 49, which is similar to the known from DE 100 29 123 A1 third section 48 of the contour of the cam designed.

Gemäß der Figur 5 wird dabei am Ende der auf die Freigabe des Federspeichers folgenden Entspannungsphase des Federspeichers zunächst die Antriebswelle 22 erneut mit dem Hebelsystem 20 gekoppelt. Dieses Ankoppeln erfolgt mittels der Transportscheibe 47, auf deren Kontur ein Bolzen 50 des Hebelsystems unter der Krafteinwirkung der sich entspannenden Federspeichers 17 wirkt. Die Transportscheibe 47 wird dabei zunächst um einen dritten Winkel k in Spannrichtung 33 der Antriebswelle 22 soweit gedreht, bis die erste Fläche 39 der Feder 40 der Kurvenscheibe wieder in Anlage mit der ersten Fläche 41 der Nut 42 der Antriebswelle gelangt und somit der Wert des Winkel-Spieles δ in Spannrichtung 33 der Antriebswelle 0 ist. Beim Weiterdrehen der Transportscheibe um einen vierten Winkel 1, dessen Wert dem Wert des Differenzwinkels γ der Kurvenscheibe entspricht, in ihrer Ausgangsstellung werden dann auch die Antriebswelle und die Steuerscheibe bis in ihre Ausgangsstellung gemäß Figur 2 zurückgestellt. Da diese Rückstellung am Ende der Entspannungsphase des Federspeichers erfolgt, d. h. lediglich die Restenergie des Federspeichers genutzt wird, ist die Beschleunigung der Transportscheibe und damit der Steuerscheibe so gering, dass zunächst der zweite Nocken 30 den zweiten Betätiger 44 freigibt, d. h. der zweite Mikroschalter geöffnet und damit der Kurzschluss wirksam aufgehoben wird, bevor der in Spannrichtung länger als der zweite Nocken ausgebildete erste Nocken 29 den ersten Betätiger 43 freigibt, d. h. der erste Mikroschalter 27 geschlossen und damit der Motor 21 wieder an seine Betriebsspannung angeschlossen und der Motor wirksam eingeschaltet wird.According to FIG. 5, at the end of the release phase of the spring accumulator following the release of the spring accumulator, first the drive shaft 22 is renewed with the lever system 20 coupled. This coupling takes place by means of the transport disc 47, on the contour of which a pin 50 of the lever system acts under the force of the relaxing spring accumulator 17. The transport disk 47 is first rotated by a third angle k in the clamping direction 33 of the drive shaft 22 until the first surface 39 of the spring 40 of the cam again comes into abutment with the first surface 41 of the groove 42 of the drive shaft and thus the value of the angle Play δ in the clamping direction 33 of the drive shaft is 0. Upon further rotation of the transport disc by a fourth angle 1, whose value corresponds to the value of the differential angle γ of the cam, in its initial position then the drive shaft and the control disc are returned to their original position shown in FIG. Since this provision is made at the end of the relaxation phase of the spring accumulator, ie only the residual energy of the spring accumulator is used, the acceleration of the transport disc and thus the control disc is so low that initially the second cam 30 releases the second actuator 44, ie the second microswitch open and so that the short circuit is effectively canceled before the formed in the clamping direction longer than the second cam first cam 29 releases the first actuator 43, ie the first microswitch 27 closed and thus the motor 21 is connected to its operating voltage and the motor is switched on effectively.

Die neue Antriebsvorrichtung weist damit den Vorteil auf, dass sich die Beschleunigung der Kurvenscheibe 24, die insbesondere von der Kraft des Federspeichers 17 abhängt, nicht direkt auf die Steuerzeiten des Motors 21 auswirkt. Dadurch ist ein Kurzschließen des Motors mit der Betriebsspannung (Netzspannung) des Motors sicher verhindert. Der Zeitabstand zwischen den beiden Schaltvorgängen der Mikroschalter kann bei der neuen Antriebsvorrichtung gegenüber der aus der DE 100 29 123 A1 bekannten Antriebsvorrichtung um das drei- bis zehnfache erhöht werden. Dies ermöglicht es insbesondere bei begrenztem zur Unterbringung der Mikroschalter zur Verfügung stehenden Bauraum, die Mikroschalter bezüglich der Zeitspanne ihrer Betätigung noch enger aneinander anzuordnen.The new drive device thus has the advantage that the acceleration of the cam 24, which depends in particular on the force of the spring accumulator 17, does not directly affect the timing of the engine 21. As a result, a short-circuiting of the motor with the operating voltage (mains voltage) of the motor is reliably prevented. The time interval between the two switching operations of the microswitch can be increased by three to ten times in the new drive device compared to the drive device known from DE 100 29 123 A1. This makes it possible, in particular with limited space available for accommodating the microswitch space to arrange the microswitch with respect to the period of their operation even closer to each other.

Claims (4)

  1. Drive apparatus (19) for a spring energy store (17) of an electric switch having a motor (21), a drive shaft (22) which can be rotated in a tensioning direction (33) by the motor (21), a cam disc (24) which is coupled to the drive shaft (22) and whose contour can be used to drive a tensioning element, which is coupled to the spring energy store, during a tensioning phase of the spring energy store (17), and having at least one control disc (26), which is coupled to the drive shaft (22), for the purpose of controlling the motor (21), characterized in that the couplings between the cam disc (24) and control disc (26) and the drive shaft (22) are designed such that, once the tensioning phase has been completed, the cam disc (24) can lead the control disc (26) at least slightly in the tensioning direction (33).
  2. Drive apparatus according to Claim 1, characterized in that the control disc (26) is fixedly connected to the drive shaft (22), and the cam disc (24) is connected to the drive shaft (22) with limited angular play (δ).
  3. Drive apparatus according to Claim 2, characterized in that, in addition, a transport disc (47) is coupled to the drive shaft (22) and, during a tensioning-relief phase of the spring energy store (17), rotates the drive shaft (22) under the effect of the force of the spring energy store on the contour of the transport disc (47) to such an extent that the value for the angular play (δ) in the tensioning direction (33) of the drive shaft is zero.
  4. Electric switch, in particular low-voltage circuit breaker having a spring energy store (17) and having a drive apparatus (19) according to one of Claims 1 to 3 for the purpose of tensioning the spring energy store.
EP20030090101 2002-04-26 2003-04-09 Driving device for the spring energy accumulator of an electric switch Expired - Fee Related EP1357567B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002119559 DE10219559C1 (en) 2002-04-26 2002-04-26 Drive device for a spring accumulator of an electrical switch
DE10219559 2002-04-26

Publications (3)

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EP1357567A2 EP1357567A2 (en) 2003-10-29
EP1357567A3 EP1357567A3 (en) 2004-04-14
EP1357567B1 true EP1357567B1 (en) 2006-06-21

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EP20030090101 Expired - Fee Related EP1357567B1 (en) 2002-04-26 2003-04-09 Driving device for the spring energy accumulator of an electric switch

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DE (2) DE10219559C1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101291791B1 (en) 2011-09-05 2013-07-31 현대중공업 주식회사 Driver of gas insulated switchgear

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2307567A (en) * 1940-07-09 1943-01-05 Gen Electric Switch closing mechanism
FR2558986B1 (en) * 1984-01-30 1986-11-21 Merlin Gerin DEVICE FOR CONTROLLING AN ELECTRIC CIRCUIT BREAKER
US5224590A (en) * 1991-11-06 1993-07-06 Westinghouse Electric Corp. Circuit interrupter having improved operating mechanism
DE10029123C2 (en) * 2000-06-14 2002-10-31 Siemens Ag Clamping device for a spring accumulator of a circuit breaker

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EP1357567A2 (en) 2003-10-29
DE10219559C1 (en) 2003-11-20
EP1357567A3 (en) 2004-04-14
DE50303899D1 (en) 2006-08-03

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