EP2188823B1 - Insulating switching rod - Google Patents

Description

The invention relates to an insulating shift rod with a drive element for initiating a drive movement in an electrical contact system of a switching device and for generating a contact force in the closed state of the contact system with a clamping device for the drive element of the shift rod to maintain the contact force.

Such an insulating switching rod is known from the prior art. In switching devices, such as circuit breakers, with an arranged in a vacuum tube electrical contact system, wherein a drive movement is introduced via a drive unit on the contact system, the insulating switching rod serves on the one hand for galvanic separation of the drive unit from the contact system and on the other hand to initiate the drive movement and to generate a substantially constant contact force in the closed state of the contact system. For this purpose, the insulating shift rod comprises a tensioning device, which is arranged in a cavity of the shift rod and acts between a drive element and a housing of the shift rod, so that when closed by the tensioning device, the contact force is maintained on the contact system.

In the insulating switching rod known from the general state of the art, the tensioning device comprises an arrangement of helical compression springs, by means of which the contact force is generated. In this case, the helical compression spring is surrounded by a housing part, which in turn is integrated in a housing part for the shift rod, wherein both the two Housing parts and connecting and / or cover parts of the housing parts are made of insulating material. In this case, the housing parts are fastened together by screw connection and to the switching device by means of a flange, as for example from DE 197 16 956 A1 . DE 9319264 U1 or DE 9203990 U1 is known. Also, instead of a screw connection, a clamping connection from the DE 3742459 A1 known. This represents a particularly complex and complex construction.

Furthermore, from the European publication EP 0 782 162 A2 a high voltage switch is known in which a drive element and a shift rod of the type mentioned are connected to each other by means of a resilient snap ring.

In the publication font JP 2004 241373 A a vacuum interrupter is described in which a sliding bearing is connected by means of a bayonet fitting with an end plate of the interrupter housing.

Object of the present invention is to provide an insulating shift rod of the type mentioned in such a way that it is simple to assemble and mount, with no torsional moments are to be introduced into the switch contact system when mounted.

This object is achieved according to the invention by an insulating shift rod according to claim 1.

By means of a plug-in and latching connection of the shift rod and the drive element, a simple assembly is advantageously made possible, with a high contact force on the switchgear, through the plug-and-detent connection during assembly and latching by further compression of the example designed as a helical compression spring clamping device in particular shunt tube contacts is generated. Thus, the mountable in the switching device shift rod due to the bias spring force of the tensioning device is quasi one piece movable and can only be disassembled in their disassembled from the interrupter state by means of targeted external force and torque introduction. In addition, allows the plug-and-lock connection the reduction of Isolierstoffteile the shift rod on two insulator. Due to the avoidance of metal parts required in the prior art, the insulating shift rod according to the invention (also called Isolierschaltstange) is easy to manufacture and inexpensive.

A possible simple embodiment of the invention provides that the plug-and-detent connection is designed in the form of a bayonet closure. As a result, a simple and quick to manufacture and releasable mechanical connection of shift rod and drive element is possible. These are connected by nesting and twisting each other and pressed against each other. In addition, a catch can be provided to secure the connection.

The shift rod and the drive element are each surrounded by an associated insulating body, which are plugged into one another and locked together. Thus, only two insulating or insulating parts are required, in which one or more spring elements, in particular helical compression springs can be inserted as a clamping device. In this case, the two insulating bodies in a simple manner in casting, injection molding or other suitable method for producing the complex body geometry can be produced.

Conveniently, one of the insulating body, in particular of the switching rod surrounding the insulating body is fixed and thus stored stationary and the surrounding the drive element insulating body movably. As a result, the drive element in a simple manner by handling a single movable insulating body, the up on the stationary insulator or used and on or in this longitudinally movable and rotatable feasible and can be latched, mounted and dismounted.

Depending on the embodiment, the clamping device is associated with one of the insulating body. Thus, for example, at least the insulating element associated with the switching rod has a cavity in which a helical compression spring arrangement is arranged as a clamping device, which comprises at least one helical compression spring arranged around the switching rod. Alternatively or additionally, the tensioning device may comprise a helical compression spring arranged around the drive element. Also, a plurality of separate and / or nested helical compression springs can be arranged in each case around the drive element and / or the shift rod. In other words, the tensioning device designed as a helical compression spring arrangement may comprise separate mutually opposite and a plurality of oppositely wound and nested helical compression springs, which have a total of a large spring force. In particular, it is possible with such a clamping device to produce large contact forces of 3500 N to 5000 N at a working stroke between 0 mm and 5 mm with a compact construction volume, wherein the helical compression spring arrangement an average spring rate of 200 N / mm at an unstretched length of approx 100 mm and for a given inner and outer coil diameter. Furthermore, advantageously a buckling safety of the helical compression spring assembly is substantially increased because one or more mutually opposed helical compression springs are stably guided or the counter-wound helical compression springs mutually stabilize against buckling, whereby the wear of the device is reduced. The helical compression spring assembly also has no edges, so that friction effects on the wall of the cavity are reduced and the wear of the Spring is lowered. In addition, helical compression springs compared to previously conventional disc springs on a flatter characteristic with a comparatively constant contact force in the wake.

For a pluggable and latchable connection of the two insulating body they are provided in a further advantageous embodiment on the inside and / or outside with locking grooves and / or snap-in hooks. Advantageously, the insulating body are provided with mutually corresponding locking grooves and latching hooks which engage positively and non-positively in the inserted and latched state. To increase the impact resistance of the latching hook or pin of the movable insulating body with impact load z. B. during the switching process can additionally reinforcing elements, for. B. star-shaped integrated metallic struts, be provided.

For a simple, safe and largely low-clearance guidance of the movable insulating body of the shift rod during assembly or disassembly guide grooves can additionally be provided on at least one of the insulator, in particular on the stationary insulator inside or outside. For a secure guidance, the guide grooves can be provided with a suitable lubricant. Also, the locking grooves can serve as guide grooves.

FIG 1

einen Schalterpol eines Schaltgerätes mit einer erfindungsgemäßen isolierenden Schaltstange mit Antriebselement,

FIG 2

eine Detailansicht der erfindungsgemäßen isolierenden Schaltstange mit Antriebselement, wobei diese zugehörige ineinander steck- und rastbare Isolierkörper mit innenseitigen Rast- und Führungsnuten aufweisen,

FIG 3

eine Detailansicht der erfindungsgemäßen isolierenden Schaltstange mit Antriebselement, wobei diese zugehörige ineinander steck- und rastbare Isolierkörper mit außenseitigen Rast- und Führungsnuten aufweisen,

FIG 4

eine Detailansicht der erfindungsgemäßen isolierenden Schaltstange mit Antriebselement, wobei diese zugehörige ineinander steck- und rastbare glockenförmige Isolierkörper mit innenseitigen Rast- und Führungsnuten aufweisen, und

FIG 5 bis 8

schematisch im Längsschnitt ein Ausführungsbeispiel einer erfindungsgemäßen isolierenden Schaltstange mit Antriebselement, wobei diese mittels einer als Bajonettverschluss ausgebildeten Steck- und Rast-Verbindung von Schaltstange und Antriebselement in verschiedenen Steck- und Rastpositionen miteinander verbindbar sind.

The invention is explained in more detail below with reference to the drawings and an embodiment with reference to the accompanying figures. Show it:

FIG. 1

a switch pole of a switching device with an insulating switching rod according to the invention with drive element,

FIG. 2

a detailed view of the insulating shift rod according to the invention with drive element, said corresponding interlocking and latchable insulating body having inside locking and guide grooves,

FIG. 3

a detailed view of the insulating shift rod according to the invention with drive element, said corresponding plugged into one another and latchable insulating body with outside locking and guide grooves,

FIG. 4

a detailed view of the insulating shift rod according to the invention with drive element, said corresponding interlocking and latchable bell-shaped insulating body having inside locking and guide grooves, and

FIGS. 5 to 8

schematically in longitudinal section an embodiment of an insulating shift rod according to the invention with drive element, which can be connected to one another by means of a bayonet lock plug and latch connection of shift rod and drive element in different plug and locking positions.

Corresponding parts are provided in all figures with the same reference numerals.

FIG. 1 shows a switch pole 1 of a circuit breaker known as such for switching or interrupting currents of a multi-phase AC network. The switch pole 1 comprises an insulating housing 2, in which a first connection piece 3 and a second connector, not shown, for connection to figuratively not shown busbars or output conductor of the switching device are arranged. To initiate a drive movement in an electrical contact system of a trained as a vacuum interrupter 5 switching device, a drive unit 4 is provided.

Between the first connector 3 and the second connector, not shown, an electrically conductive connection via the contact system of the vacuum interrupter 5 by means of, for example, designed as a magnetic drive unit 4 can be prepared or separated. Here, an unillustrated Bewegkontaktelement the vacuum interrupter 5 by means of an insulating shift rod 7, which comprises a conductive connecting rod 6, with a driving pin formed as a drive element 8 (hereinafter called drive pin 8) movable. In this case, the drive unit 4 engages in order to initiate the drive movement, in particular a translational movement and / or a rotational movement in the drive bolt 8.

In addition, the insulating shift rod 7 comprises the connecting rod 6. The insulating shift rod 7 and the drive bolt 8 are each surrounded by an associated insulating body 9 and 10 respectively. The insulating body 9 and 10 are made of insulating material. The connecting rod 6 and the drive pin 8 are part of the insulating shift rod 7, which with respect to the FIGS. 2 to 8 will be explained in more detail below.

The insulating shift rod 7 is mechanically coupled to the drive unit 4 via the drive pin 8, via which a drive movement is introduced into the moving contact element of the vacuum interrupter 5.

FIG. 2 shows the insulating shift rod 7 with drive pin 8 FIG. 1 in a detailed view.

The insulating shift rod 7 comprises the insulating body 9, in which the connecting rod 6 is cast. In the insulating body 10 of the drive pin 8 is cast. In this embodiment, the insulating body 9 has a cylindrical cavity 11, which is closed by means of the other insulating body 10. The cast-in in the insulating body 9 connecting rod 6 and cast in the insulating body 10 drive pin 8 extend surrounded by the insulating material from the respective bottom of the insulating body 9 and 10 out cylindrically. The drive bolt 8 further has a connection-like portion 12, which serves to receive a connection element, not shown.

The two insulating body 9 and 10 are plug-in connection 13 in or one another plugged and locked together connectable. For this purpose, the insulating body 9 is stationary with the connected to the vacuum interrupter 5 connecting rod 6 and thus executed fixed. The insulating body 10 with the drive pin 8 is movable, in particular longitudinally movable and rotatable.

To limit the movement of the drive pin 8, the cavity 11 at its open end 13 a introduced into the wall of the fixed insulator 9, for example, segmentally circumferential groove-shaped and serving as a locking groove 14 recess. The movable insulating body 10 has for this purpose a serving as a latching hook 15 projection on, which is guided in the locking groove 14 and can be latched in an end position. The detent groove 14 limited by the height of the movement of the locking groove 14 longitudinally movable and rotatably guided insulator 10 and thus serves as a stop element. The height of the locking groove 14 is chosen so that it is substantially greater than the height of the latching hook 15. In addition, the height or the course of the locking groove 14 is selected such that by means of the clamping device 18, a biasing force is set.

In the cavity 11 is a tensioning device 18 is a helical compression spring arrangement (hereinafter called helical compression spring assembly 18) arranged with at least one helical compression spring F. The helical compression spring assembly 18 is biased at a single helical compression spring F between a spring plate 16 arranged in the bottom region of the cavity 11 and a further spring plate 17 arranged in the bottom region of the insulating body 10. The helical compression spring F has an inner diameter on which the outer diameter of the cylindrical elevations from the bottom regions of the two insulating 9 or 10 corresponds, so that the helical compression spring F is guided on the inner wall of these surveys.

Alternatively, the helical compression spring assembly 18 may comprise two separate helical compression springs F1 and F2, which are arranged opposite each other on the connecting rod 6 and the drive pin 8 and are moved towards each other and biased upon actuation of the drive pin 8.

With such an insulating switching rod 7 with drive pin 8, a galvanic isolation between the drive unit 4 and the contact system of the vacuum interrupter 5 is formed in a switching device on the one hand, as a Drive movement of the drive unit 4 is transmitted via the insulating shift rod 7, wherein no galvanic connection between the drive pin 8 and the connecting rod 6 is present. Furthermore, after a successful drive movement to close the contact system of the vacuum interrupter 5, a contact force transmitted by the helical compression spring assembly 18 of the insulating shift rod 7 on the Bewegkontaktelement in the closed state of the contact system of the vacuum interrupter 5, because after the drive movement and locked drive pin 8 by the helical compression spring assembly 18 between the bottom portion over the latched in the locking groove 14 movable insulating body 10 of the drive pin 8, the spring force of the helical compression spring assembly 18 acts on the connecting rod 6 and thus on the Bewegkontaktelement the vacuum interrupter 5.

Like from the FIG. 2 it can be seen, in particular by the arrangement of the helical compression spring arrangement 18 a tilting security of the spring arrangement is ensured because the helical compression spring / F or F1, F2 out in the spring plates 16, 17 and is stabilized against tilting or are. With such a helical compression spring arrangement 18, it is possible, in particular, to generate large contact forces of 3,500 to 5,000 N with a working stroke between 0 and 5 mm, the helical compression spring arrangement 18 having an average spring rate of 200 N / mm at an unstretched length of approx 100 mm and for a given inner and outer coil diameter. Depending on the nature and structure of the helical compression spring assembly 18, this may also include more than one helical compression spring. In the case of several helical compression springs, these can in particular be wound in opposite directions.

Figures 3 and 4 show different embodiments of different housing shapes of the insulating body 9 and 10 and different plug-and-detent connections 13th

In FIG. 3 the detent groove 14 is inserted on the fixed insulating body 9 on the outside in the wall thereof. The movable insulating body 10 has with the locking groove 14 corresponding locking hooks 15 which engage around the fixed insulating body 10 and are guided in the locking groove 14 longitudinally movable and rotatable in this latched.

In FIG. 4 the insulating body 10 also has a cavity 19. The two insulating body 9 and 10 are performed in the manner of nested bells, wherein in the inner wall of the stationary insulating body 9, the locking groove 14 is introduced, in which a projection of the insulating body 10 is guided as a latching hook 15 longitudinally movable and rotatable and latched.

FIGS. 5 to 8 show schematically in longitudinal section an embodiment of an insulating shift rod 7 according to the invention with a constructed as a bayonet lock plug and locking connection 13 of shift rod 7 and drive pin 8 in different plug and detent positions. For this purpose, the movable insulating body 10 of the drive pin 8 is inserted into the opening area and the cavity 11 of the stationary or fixed insulating body 9 and 10, in particular plugged. Depending on the embodiment - both or only one of the two insulating body 9 and 10 is movable during assembly / disassembly - the two insulator 9 and 10 are also inserted into one another.

For nesting or insertion into the inner wall of the one, in particular the fixed Insulating body 9 distributed over the surface of a plurality of locking grooves 14, in which are guided to these corresponding locking hooks 15 of the other, in particular movable insulating body 10. For this purpose, the latching hooks 15 are radially from the movable insulating body 10.

The two insulators 9 and 10 are, as in FIG. 6 shown plugged into each other in the insertion direction to a stop and then at least one of the two insulating 9 or 10 or both mutually rotated to a rotation stop and then moved against the direction of insertion to a latching stop and there latching connected, as in FIGS. 7 and 8 shown.

Such as a bayonet lock plug-and-latching connection 13 is a simple and quick to manufacture and releasable mechanical connection of shift rod 7 and drive bolt 8 allows.

The in the FIGS. 5 to 8 illustrated embodiment of the male and female connection 13 is an embodiment, wherein the number, type, shape and / or the course of latching hooks 15 and / or locking grooves 14 may vary.

LIST OF REFERENCE NUMBERS

1

A pole

2

Insulated

3

First connection piece

4

drive unit

5

Vacuum interrupter

6

connecting rod

7

Insulating shift rod

8th

drive pin

9

Solid insulating body

10

Movable insulating body

11

Cavity in the solid insulating body

12

connecting element

13

Plug-locking connection

14

locking groove

15

latch hook

16

Spring plate of the solid insulating body

17

Spring plate of the movable insulating body

18

jig

19

Cavity in the movable insulating body

F, F1, F2

Helical compression springs

Claims (8)

1. Insulating switching rod (7) having a drive element (8) for introduction of a drive movement into an electrical contact system of a switching device and for production of a contact force in the closed state of the contact system having a stressing apparatus (18) for the drive element (8) of the switching rod (7) in order to maintain the contact force, wherein the switching rod (7) and the drive element (8) can be connected indirectly or directly by means of a plug and latching connection (13),
   characterized in that
   the switching rod (7) and the drive element (8) are each surrounded by an associated insulating body (9, 10) which can be plugged into one another and can be connected to one another such that they can be latched.
2. Insulating switching rod according to Claim 1,
   characterized in that
   the plug and latching connection (13) is in the form of a bayonet fitting.
3. Insulating switching rod according to Claim 1 or 2,
   characterized in that
   one of the insulating bodies (9) is arranged in a fixed manner, into which the other insulating body (10) can be movably plugged and latched.
4. Insulating switching rod according to one of Claims 1 to 3,
   characterized in that
   at least that insulating body (9) which is associated with the switching rod (7) has a cavity (11) in which a helical compression spring arrangement comprising at least one helical compression spring (F, F1) which is arranged around the switching rod (7), is formed as the stressing apparatus (18).
5. Insulating switching rod according to one of Claims 1 to 4,
   characterized in that
   the stressing apparatus (18) additionally has a helical compression spring (F, F2) which is arranged around the drive element (8).
6. Insulating switching rod according to one of Claims 1 to 5,
   characterized in that
   a plurality of helical compression springs (F, F1, F2), which are interleaved in one another or are in each case separate, are in each case arranged around the drive element (8) and/or the switching rod (7).
7. Insulating switching rod according to one of Claims 1 to 6,
   characterized in that
   the insulating bodies (9, 10) are provided on the inside and/or on the outside with at least one latching groove (14) and/or at least one latching hook (15).
8. Insulating switching rod according to one of Claims 1 to 7,
   characterized in that
   the insulating bodies (9, 10) are provided with mutually corresponding latching grooves (14) and latching hooks (15) which, when plugged together, engage in one another in an interlocking and force-fitting manner.

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