EP0813742B1 - Mechanical and-member for mutually locking power switches - Google Patents

Description

• jeder Leistungsschalter ist mit einem biegsamen Übertragungsorgan versehen, wobei
  • zwei der Übertragungsorgane in Abhängigkeit von der Schaltstellung der zugehörigen Leistungsschalter im Sinne eines dem UND-Glied zuzuführenden Eingangssignales und das verbleibende Übertragungsorgan durch gleichzeitige Betätigung der beiden ersten Übertragungsorgane im Sinne eines zu dem dritten Leistungsschalter zu übertragenden Ausgangssignales betätigbar sind,
• das UND-Glied weist einen Träger sowie einen relativ zu dem Träger bewegbaren Kupplungschlitten auf,
• jedes biegsame Übertragungsorgan weist einen Mantel und einen in dem Mantel verschiebbaren Seilzug auf, wobei
  • der Träger als Widerlager zur Abstutzung der Mäntel ausgebildet ist,
• die Übertragungsorgane sind mit dem Träger derart verbunden, daß die Seilzüge mit parallelen Längsachsen in das UND-Glied eintreten,
• jeder der Seilzüge ist zur Verbindung mit dem Kupplungsschlitten mit einem Mitnehmer versehen,
• der Kupplungsschlitten ist als Balken ausgebildet, der sich quer zu den Längsachsen der Seilzüge erstreckt und die Mitnehmer der Seilzüge mit gegenseitigen Abstand aufnimmt,
• der das Ausgangssignal übertragende Seilzug ist mit dem Kupplungsschlitten außenliegend verbunden, während der Seilzug für das eine der Eingangssignale etwa mittig und der dem verbleibenden Eingangssignal zugeordnete Seilzug dem das Ausgangssignal übertragenden Seilzug gegenüberliegend mit dem Kupplungsschlitten verbunden ist,
• die den Eingangssignalen zugeordneten Seilzüge sind mit einander entgegengesetzter Wirkungsrichtung angeordnet.

The invention relates to a mechanical AND gate for interlocking three circuit breakers with the following features:

• each circuit breaker is provided with a flexible transmission element, whereby
  • two of the transmission elements can be actuated as a function of the switching position of the associated circuit breakers in the sense of an input signal to be supplied to the AND gate and the remaining transmission element can be actuated by simultaneous actuation of the first two transmission elements in the sense of an output signal to be transmitted to the third circuit breaker,
• the AND element has a carrier and a coupling slide which can be moved relative to the carrier,
• each flexible transmission member has a jacket and a cable that is displaceable in the jacket, wherein
  • the carrier is designed as an abutment for supporting the coats,
• the transmission elements are connected to the carrier in such a way that the cables with parallel longitudinal axes enter the AND element,
• each of the cables is provided with a driver for connection to the coupling slide,
• the coupling slide is designed as a bar which extends transversely to the longitudinal axes of the cable pulls and receives the drivers of the cable pulls at a mutual distance,
• the cable that transmits the output signal is connected to the coupling carriage on the outside, while the cable for one of the input signals is connected approximately in the middle and the cable that is assigned to the remaining input signal is connected to the coupling carriage opposite to the cable that transmits the output signal,
• the cable pulls assigned to the input signals are arranged with opposite directions of action.

An AND gate of this type is known from DE 44 09 172 A1 known. The cables are opposite Coupling slide biased by springs. Therefore requires it has the desired function that the spring forces are accurate are coordinated. With another already known AND gate according to DE 36 11 020 Al, that of the aforementioned AND element is similar, are the flexible transmission organs designed as a wire release that transmit pressure forces. The clutch carriage is powered by a wire release for a first input signal shifted and itself serves as a carrier of the wire release for the second input signal. To this The wise man only then arrives at the exit of the AND gate complete stroke occurs when both input signals available. However, this way of working requires that the Cable release for the second input signal can be moved must be performed. Furthermore, careful care is required Adjust all wire triggers to ensure that only with full stroke of both wire releases for the input signals the correct actuation of the wire release for the Output signal occurs and therefore only the desired one Process occurs. For this purpose, the known AND gate between the coupling carriage and the wire release for the output signal to change the gear ratio a graded intermediate lever is provided.

The invention has for its object to build a mechanical AND gate to simplify and reliable Ensure working methods.

• der Mitnehmer wirkt mit dem Kupplungsschlitten im Sinne einer Freilaufkupplung derart zusammen, daß zwischen dem Kupplungsschlitten und den Seilzügen nur Zugkräfte übertragbar sind,
• im unbetätigten Ruhezustand des UND-Gliedes liegen der Mitnehmer des in mittlerer Position mit dem Kupplungsschlitten verbundenen Seilzuges und der Mitnehmer des Seilzuges für das Ausgangssignal an dem Kupplungsschlitten an, während der Mitnehmer des in außenliegender Position angeordneten Seilzuges für das eine Eingangssignal dem Kupplungsschlitten mit einem Abstand derart gegenübersteht, daß der Kupplungsschlitten bei einer Betätigung des in der mittleren Position angebrachten Seilzuges um den Mitnehmer des in außenliegender Position angebrachten Seilzuges schwenkbar ist.

According to the invention, this object is achieved by the following further features:

• the driver cooperates with the coupling carriage in the sense of a one-way clutch in such a way that only tensile forces can be transmitted between the coupling carriage and the cable pulls,
• In the unactuated idle state of the AND element, the driver of the cable pull connected in the middle position to the coupling slide and the driver of the cable pull for the output signal are in contact with the coupling slide, while the driver of the cable pull arranged in the external position for the one input signal is at a distance from the coupling slide stands in such a way that when the cable pull attached in the middle position is actuated, the coupling slide can be pivoted about the driver of the cable pull attached in the external position.

The AND gate according to the invention has the property that only a full stroke of the cables for the input signals operated the cable for the output signal. There is only one of the input signals, the cable remains for the output signal in peace.

In contrast to the AND gate known at the outset, only transfer tensile forces to the AND gate according to the invention. This leads to the possibility of the cables being flexible Transmission links with the coupling slide directly to connect. In the context of the invention can therefore be of use special guide means for the coupling slide be disregarded. Rather, the coupling carriage on the Carrier be guided only by the cables. To this The coupling carriage is directed towards the cables out. Such an arrangement proves to be special low friction and is subject to practically no wear.

With sufficient dimensions of the AND gate, the relative change in the distance between the cables when swiveling of the coupling carriage so low that of special means can be dispensed with to compensate for the misalignment. However, if the AND gate is intended to be used for Circuit breakers with compact dimensions also small and compact, it is recommended that the Coupling slides extending in its longitudinal direction Elongated holes for receiving a slide for each passage who has cables assigned to the input signals. At this arrangement, the coupling slide depends on remaining third, assigned to the output signal Pull out.

The invention is described below with reference to the figures illustrated embodiment explained in more detail.

FIG. 1 shows a basic circuit diagram with three circuit breakers.

Figures 2 and 3 show an AND gate schematically in the Top view and in a side view.

FIG. 4 shows the AND gate according to FIGS. 2 and 3 when one of the input signals is present, while FIG. 5 represents the state when the other input signal is present.

6 shows the state that both input signals are present and accordingly output an output signal becomes.

In Figure 1 is a schematic diagram with three Circuit breakers LS1, LS2 and LS3 shown. Here are the Circuit breakers LS1 and LS2 each of a power supply assigned via a transformer while the circuit breaker LS3 is assigned to an emergency power generator G. In such a circuit is for operational reasons required that the circuit breaker LS3 is open, when one of the circuit breakers LS1 and LS2 is closed are.

A mechanical AND gate U, using which the mutual locking task described above the circuit breaker LS1, LS2 and LS3 to solve the following figures show. First, the construction of the AND gate explained with reference to Figures 2 and 3. The AND gate U has a sheet metal, for example Carrier T on the top and bottom of the Formation of an edge web T1 is folded twice. Openings T2 are used for any attachment of the AND gate U in a switchgear or on a circuit breaker. The edges of the beam T serve as an abutment of three flexible transmission elements S1, S2 and S3, the each a jacket S4, S5 or S6 and one in the jacket S4, S5, S6 have guided cable S7, S8 and S9. For Support of the jackets S4, S5 and S6 of the flexible transmission elements S1, S2 and S3 on the carrier T is in each case one End piece S10 provided. Point in the area of the AND gate U. the cables 57, 58 and S9 have parallel longitudinal axes.

The wire rope hoists S7, S8 and S9 are with a beam-like Coupling carriage K connected, the two parallel Sheet metal parts K6 is formed, as is closer to FIG can be seen. Both sheet metal parts K6 are riveted Spacers K7 connected. The wire rope hoists 57, S8 and S9 push through a cylindrical slide K1, K2 or K3, that in opposite openings of the coupling carriage K intervenes. The openings for the sliders are K1 and K2 as elongated holes K4 and K5. Of the Coupling carriage K is thus through the connection with the Cables S7, S8 and S9 floating on the support T. Only to secure the coupling carriage K in The relaxed state of the cable pulls S7, S8 and S9 is on the Edge webs T1 a protective cover T3 placed in the figure 3 is shown. In Figure 2, the protective cover is T3 omitted so that the coupling slide K completely is visible. Each of the cables S7, S8 and S9 is with one associated driver S11, S12 or S13. Like that FIGS. 2 and 3 show the catches S12 and S13 on the sliders K2 and K3 while the driver S11 is at a distance D from the slider K1.

For the operation of the AND gate U, the arrangement of the Transmission elements S1, S2 and S3 relative to the coupling carriage K important. As shown in Figure 2, the cables S7 and. assigned to input signals E1 and E2 S8 of the transmission elements S1 and S2 in opposite Direction on the coupling carriage K. The S9 wire rope hoist Transmission device S3 for the output signal A is parallel arranged to the cable pull S7 and engages on the opposite End of the coupling carriage K. The S8 cable pull Transmission device S2 for the input signal E2 intervenes approximately in the middle of the coupling carriage K and acts in the opposite direction as the cables S7 and S9.

The transmission elements S1 and S2 are each an input signal E1 or E2 assigned, while the transmission element S3 to Forwarding an output signal A is used. In the state of AND gate U according to Figures 2 and 3 are no input signals E1 and E2 before. Accordingly, the Coupling slide K in its rest position, in which it is on a dot-dash basic position labeled "0" is aligned. The designations of the input signals E1 and E2 and the output signal A are placed in brackets, to indicate that these signals are not active.

4 shows the state that an input signal El acts on the cable pull S7. The driver S is the Slider K1 no longer in the distance D, but in compared to a shorter distance D1. The coupling slide K thus remains unactuated, so that no output signal A is delivered.

In Figure 5 it is shown that the coupling carriage K a assumes an inclined position if instead of the input signal E1 there is an input signal E2. The S8 wire rope hoist for the output side of the AND gate U, however, remains in Quiet, as can be seen from the fact that the slide K3 remains unchanged in the reference plane "C".

However, both input signals E1 and E2 occur like this 6 shows, the coupling carriage K is taken along and from the reference level "0" to the one below Reference plane "1" moved parallel to itself. Here the cable pull S9 is actuated, which emits the output signal A corresponds. This is used in a known manner the circuit breaker LS3 (Fig. 1) against engagement block if by closing the circuit breaker LS1 and LS2 the input signals E1 and E2 are output.

Claims (3)

1. Mechanical AND gate (U) for mutual interlocking of three circuit breakers (LS1, LS2, LS3) having the following features:

   each circuit breaker (LS1, LS2, LS3) is provided with a flexible transmission member (S1, S2, S3),

   two of the transmission members (S1, S2) being operable as a function of the switch position of the associated circuit breakers (LS1, LS2) in the sense of an input signal (E1, E2) which is to be supplied to the AND gate (U), and the remaining transmission member (S3) being operable by simultaneous operation of the two first transmission members (S1, S2) in the sense of an output signal (A) which is to be transmitted to the third circuit breaker (LS3),

   the AND gate (U) has a carrier (T) as well as a coupling slide (K) which can move relative to the carrier (T),

   each flexible transmission member (S1, S2, S3) has a casing (S4, S5, S6) and a cable run (S7, S8, S9) which can be displaced in the casing (S4, S5, S6),

   the carrier (T) being designed as an opposing bearing for supporting the casings (S4, S5, S6),

   the transmission members (S1, S2, S3) are connected to the carrier (T) in such a manner that the cable runs (57, S8, S9) enter the AND gate (U) with parallel longitudinal axes,

   each of the cable runs (S7, S8, S9) is provided with a driver (S11, S12, S13) for connection to the coupling slide (K),

   the coupling slide (K) is designed as a beam which extends transversely with respect to the longitudinal axes of the cable runs (S7, S8, S9) and holds the drivers (S11, S12, S13) of the cable runs (S7, S8, S9) spaced apart from one another,

   the cable run (S9) which transmits the output signal (A) is connected, located on the outside, to the coupling slide (K), while the cable run (S8) for one (E2) of the input signals (E1, E2) is connected approximately centrally to the coupling slide (K), and the cable run (S7) which is assigned to the remaining input signal (E1) is connected to the coupling slide (K) opposite the cable run (S9) which transmits the output signal (A),

   the cable runs (S7, S8) which are assigned to the input signals (E1, E2) are arranged such that they act in mutually opposite directions,

   characterized by the following features:
   the driver (S11, S12, S13) interacts with the coupling slide (K) in the sense of a freewheeling coupling in such a manner that only tensile forces can be transmitted between the coupling slide (K) and the cable runs (S7, S8, S9),

   when the AND gate (U) is in the unoperated, quiescent state, the driver (S12) of the cable run (S8) which is connected to the coupling slide (K) in the central position, and the driver (S13) of the cable run (S9) for the output signal (A) rest against the coupling slide (K), while the driver (S11) of the cable run (S7), which is arranged in the outer position, for one input signal (El) is opposite the coupling slide (K) and at a distance (D) from it, in such a manner that the coupling slide (K) can be pivoted, during operation of the cable run (S8) which is fitted in the central position, about the driver (S13) of the cable run (S9) which is fitted in the outer position.
2. Mechanical AND gate according to Claim 1, characterized in that the coupling slide (K) is guided on the carrier just by the cable runs (S7, S8, S9).
3. Mechanical AND gate according to Claim 1 or 2, characterized in that the coupling slide (K) has elongated holes (K4, K5), which extend in its longitudinal direction, for holding in each case one sliding element (K1, K2) for those cable runs (S7, S8) which are assigned to the input signals (E1, E2) to pass through.

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