WO2011023205A1 - Drive device, in particular for a multi-position switching apparatus - Google Patents

Abstract

The invention relates to a drive device, in particular for a multi-position switching apparatus, for example for a disconnecting and earthing switch, the movable contact piece (11) of which can be brought into three different positions: switched-on position, disconnected position, earthing position, and back, comprising a carrier (22) which can be moved linearly by means of a linear motion drive (18, 16), wherein an electromagnetically controllable link motion (41, 42) is provided, which retains and locks the carrier (22) in the three positions.

Description

 Drive device in particular for a Mehrstellungsschaltqerät

description

The invention relates to a drive device, in particular for a multi-position switching device according to the preamble of claim 1.

Electrical power distribution units are designed as rietall-encapsulated, SF6-gas-insulated switchgear that includes several switchgear, including disconnectors and earthing switches. These earthing switches and circuit breakers are combined with each other in one unit, having a contact system with a movable contact piece, a high voltage fixed contact piece and a grounded fixed contact piece (grounding contact piece). In this case, the movable contact piece may be a thrust contact piece which is brought into contact with the fixed contact piece located at high voltage and the earthing contact piece, the drive of the linearly movable contact piece being effected via a gear spindle, as known, for example, from EP 0 824 264 B4.

The object of the invention is to provide a drive device of the type mentioned, which is simple in construction and with the sufficient reliability of the drive function can be achieved.

This object is achieved by the features of claim 1. According to the invention, a drive device, in particular for a multi-position switching device, for example for a disconnector and earthing switch whose movable contact piece in different positions: switch-on position, disconnected position, grounding position and can be moved back provided with a driver which is linearly movable by means of a linear motion drive, in which a link control is provided which holds the driver in the different positions.

According to a first embodiment, the slide control can have two slide pieces, of which at least one has depressions for receiving the driver.

In this case, this link piece may have three recesses in which the driver is held, the link piece with the recesses of the other link piece by means of a drive is removable, so that the driver is freely movable in the separate position of the two link pieces. In this case, the other link piece on the backdrop piece with the recesses hinweisenden side have a flat surface and be stored stationary.

The operation of this link control is such that when the driver is in one of the wells, the two link pieces are pressed against each other. So that the driver can be moved, the link piece with the recesses must be deducted from the other link piece; In this case, a free mobility of the driver to the next depression is possible.

A particularly advantageous embodiment of the invention can be dahingehen that the link device comprises two link pieces, each of which has a recess and within the recess depending on a strip-like projection, wherein the strip-like projections are offset from each other, so that when joining the two link pieces, the strip-like projections itself overlap and each form a space between them and the end surfaces of the recesses, which serves to receive the driver in each one of the three positions.

In this case, the strip-like projections may each be limited by step walls, of which the one step walls between them form a receiving space and the other step walls with the end faces of the recesses each form a further receiving space. In this case, there is a receiving space between the step walls, which are opposite, whereas between the other step walls and the end surfaces of the recess each further receiving spaces are formed, which are arranged on both sides to the receiving space located between the one step walls.

It goes without saying that the two link pieces must each be locked against each other, so that impermissible movements of the driver do not occur.

In a particularly advantageous manner may be provided as drive elements for the link pieces electromagnet systems. Of course, it is also possible to use hydraulic or pneumatic drive elements for the link pieces.

It is possible that the directions of movement of the drive elements once perpendicular to the direction of movement of the driver and the other parallel to the direction of movement of the driver, in the latter case, the direction of movement of the drive elements by means of a reversing lever for moving the link pieces against each other and away from each other are deflected.

In cases where the drive elements are out of operation, a manual transmission arrangement can be provided in an expedient manner on the lever each with a handle part which converts a rotational movement about a stationary axis into a rotational movement of the reversing lever.

Further advantageous embodiments and improvements of the invention can be found in the further subclaims.

With reference to the drawings, in which three embodiments of the invention are shown, the invention, further advantageous embodiments and improvements of the invention and further advantages will be explained and described in detail. Show it

1 is a schematic representation of a drive device,

Figures 2 and 3 a first embodiment of the invention in different

 positions

FIGS. 4 to 7 show a further embodiment of the invention in different positions,

Fig. 8 shows a third embodiment of the invention with manual drive, and

9 is a schematic representation of an end region of

 Slotted link pieces with a lock.

Reference is made to FIG. 1.

An electrical switching device 10, shown schematically in FIG. 1, which is a three-position switching device, that is, which can assume a grounding position, a disconnected position and a closed position, has a movable contact piece 11, which is arranged in a cable run 12 within a metal-enclosed switchgear. This movable contact piece 11 can take three positions; in one position, the movable contact piece 11 is in communication with a stationary contact piece 13 located at high-voltage potential; in a further position is the movable contact piece 11 with a grounded contact piece 14, also called Erdungskontaktstück 14, in conjunction and in the third, drawn position, the contact piece 11 is at a sufficient distance from the fixed, located at high voltage potential contact piece 13 and the fixed grounding contact piece 14; this position is the so-called separation position.

The movable contact piece 11 is driven by a drive device 15 which has a drive spindle 16 which has an external thread 17 on which a carriage 18 is guided such that the carriage 18 moves in a rotation of the spindle 16 either upwards in the direction of arrow P1 or down in the direction of arrow P2. The drive spindle 16 is rotated by means of a gear consisting of two gear wheels 19 and 20, which is driven by an electric motor 21 in rotation. The carriage 18 is a driver 22, which, as can be seen from Figures 2 to 7, moves in the direction of arrow P1 and P2 and can be fixed in three positions.

For this purpose, the drive device has two link pieces 23 and 24, of which the one link piece 23 has three recesses 25, 26 and 27, whereas the other link piece 24 has a flat surface 28, against which the open sides of the recesses 25 to 27 are directed ,

The one link piece 23 can be actuated by means of a stationary magnet system 29, specifically in the direction of the arrow P3; It can therefore be separated from the other gate piece 24 accordingly.

Fig. 2 shows the driver 22 in its middle position, ie in the position in which the driver 22 is located in the central recess 26.

If the driver 22, for example, upwards in the direction of arrow P1 to be moved, the one link piece 23 is deducted from the other link piece 24 in the direction of arrow P ₃ by means of the solenoid device or the magnet system 29, whereby the central recess 26 releases the driver 22 and thus the driver 22 can be set in motion by rotation of the drive spindle 16. As a result, the movable contact piece 11 is moved in accordance with the line of action 30 from the position shown in the grounding position. This position is represented by the dashed line position of the driver 22 '. To lock the one link piece 23 is moved in the dashed position 23 'against the other link piece 24, whereby the upper recess 25 is pushed over the driver and the driver 22 is held in the upper recess 25. If the drive spindle 16 is rotated in the opposite direction, the carriage 18 is moved in the direction of arrow P2, so that the driver 22 is moved to the position 22 ", for which purpose a gate piece 23 is again separated from the other gate piece 24, so that the driver 22 is released and on the middle, thick extended position in the position shown in the drawing below, which is extended by 22 ", can be moved; after reaching the position 22 ", the one link piece 23 is moved against the other link piece 24, so that the driver 22 is held in the lower recess 27.

The control of the solenoid system 29 is carried out as needed, taking into account certain locking conditions, which will not be explained in detail here.

FIGS. 4 to 7 show a further embodiment of the invention. The drive device, which bears the reference numeral 40 in its entirety, comprises two slide pieces 41 and 42 which are each driven by means of a solenoid system 43 and 44. On the opposite sides each gate piece has a respective recess 45 and 46, in which strip-like projections 47 and 48 are provided; the strip-like projection 47 of the first link piece 41 is offset relative to the strip-like projection 48 of the second link piece 42 and is located in the drive direction (P1 or P2) below the strip-like projection 48 of the second link piece 42, so that the strip-like projection 47 of the first link piece 41 can engage in the recess 46 of the second link piece 42. The strip-like projection 48 of the second link piece 42 engages above the strip-like projection 47 of the first link piece 41 in the recess 45 of the first link piece 41 a. The strip-like projection 47 has a respective step wall 49 and 51, via which the front surface of the strip-like projection 47 merges into the bottom surface of the recess 45. The recess 45 is bounded by a first end face 50, which is located at a distance A from the step wall 49, and a second end face 52, wherein the end faces 50, 52 are perpendicular to the direction of movement Pi of the carriage 18. In a corresponding manner, the recess 46 of the second link piece 42 also has end faces 55 and 56, which lie at the same height as the end faces 50 and 52 of the recess 45 of the first link piece 41 and also perpendicular to the direction of movement Pi of the carriage 18.

The strip-like projection 48 of the second link piece 42 has similar to the strip-like projection 47 of the first link piece 41 step surfaces 53 and 54 or step walls 53, 54, via which the front surface of the projection 48 merges into the bottom surface of the recess 46.

The strip-like projections 47 and 48 are, as mentioned above, one above the other, wherein they coincide in the contracted state, see Fig. 4 and Fig. 6, wherein the step surface 54 to the end surfaces 52 and 56, the step surfaces 53 of the strip-like projection 48th to the step surface 51 of the strip-like projection 47 and the step surface 49 of the strip-like projection 47 to the end surfaces 50 and 55 of the recesses 45 and 46 each occupy a distance A, so that in the contracted state of the two link pieces 41 and 42 each have a space 57, 58 and 59 is formed, in which the driver 22 can be accommodated. The three spaces 57, 58 and 59 are superposed, with the first space 57 in the drawing above the middle space 58 and the second space 59 below the middle space 58. Above and below mean here the specified in Figures 4 to 7 positions of the driver 22, wherein when the driver is in the first, upper space 57, the movable contact piece 11 is in the grounding position; when the driver 22 is received in the central space 58, then the movable contact piece 11 is in the disconnected position, and when the driver is received in the lower, second space 59, the movable contact piece 11 is in the position in which it the located at high voltage potential contact piece 13 is in communication. It should be noted that in other arrangement or in another embodiment of the switching device 10, the positions of the driver 22 in the three rooms can lead to a different contacting position or separation position of the movable contact piece 11. In the position shown in FIG. 4 is located Depending on the position of the carriage 18, the driver 22 can also be moved into the space 57 or in the space 59.

Reference is now made to FIG. 5.

In the illustration shown in FIG. 4 and FIG. 5, the driver 22 is in its middle position and in this case between the Stufenwänden- or surfaces 51 and 53 of the projections 47 and 48 in space 58. At its movement in the direction of arrow Pi, as From Fig. 4 can be seen, the driver 22 held by the step wall 53. Now, if the gate piece 42 in the direction of arrow P4, see Fig. 5, is subtracted, which is done by means of the electromagnetic system 43, then the step wall 53, the driver 22 free and the driver 22 can move according to the direction of arrow P1 upwards, so that the movable Contact piece 11 in the grounding position, in which the movable contact piece 11 comes into contact with the grounding contact piece 14, is spent. In this case, a restoring element 61 is arranged between the link piece 42 and the electromagnetic drive 44, which then spins the link piece 42 back into the position in which the projection 48 in the recess 45 and the projection 47 engage in the recess 46. Such a return element may for example be a spring arrangement or else part of the electromagnetic system. When the movable contact piece 11 is to be moved back again, for example, from the grounding position to the closed position, that is, when the movable contact piece 11 is to be brought into contact with the fixed contact piece 13, then by means of the electromagnetic drive 43 against the force of a restoring element 62 Slotted link 41 from the drawn in Fig. 6 position against the force of a return element 62 in the direction of arrow P ₅ method, whereby the link piece in the recess 46 can be moved to the end wall 55 and 50, so that the driver 22 in the lower area at E , ie in closed position. The two return elements 61 and 62 act on the respective associated link piece when the solenoid drive 44 or 43 is switched off again, whereby the first link piece 41 and the second link piece 42 is pressed into the position, as shown in Fig. 4 or 6, in which Position the link pieces 41, 42 are pressed against each other. It is from security and Locking reasons to ensure that the two solenoid actuators 43 and 44 are energized or turned on only when the link piece 41 or the link piece 42 to be removed from the other.

The embodiment according to Figures 4 to 7 has the advantage that the driver 22, when the one link piece is removed from the other link piece, always a step surface 51 or 53 or an end surface 52, 56 and 50, 55 as a stop for the Driver is used so that a movement of the driver over the respective positions addition, as could be the case in the embodiment according to Figures 2 and 3, definitely avoided. This additional security for the operation of a movable contact piece of a switching device is effected.

The drive of the motor 21 can be pneumatic, hydraulic or electric. Of course, there is also the possibility of a manual drive. In the same way, the gear 19, 20 may be formed in different ways. By means of the gear 19, 20, the spindle 16 is driven, which is a so-called Huberzeugungselement, which has the task to convert a rotational movement in a linear movement of the switch 18.

The actuation of the link pieces 23, 24 or the link pieces 41, 42 may, as described above, be made electromagnetically. Of course, there is also the possibility to use other types of drives, in particular of hydraulic or pneumatic drives.

Referring now to FIG. 8.

Here are the two link pieces 41 and 42 side by side, that the projections 47 and 48 respectively engage in the recesses 46 and 45. It can be seen from Fig. 8 that the end faces 52, 56, 50 and 55 are generally equal in height to the step walls 49, 51, 53 and 54 so that the end faces 52, 56; 50 and 55 each about half the height of each step wall 49, 51, 53 and 54 correspond. In the embodiment of Figures 4 to 7, the solenoid actuators 43 and 44 are opposite, wherein the direction of movement of the solenoid actuators 43, 44 is perpendicular to the movement of the driver 22.

In the variant according to FIG. 8, electromagnetic drives 81 and 82 are located on both sides of the link pieces 41 and 42 such that the direction of movement of the drives 81 and 82 runs parallel to the direction of movement of the driver 22.

Reference is made to the one solenoid 82. The operation of the other solenoid 81 and the transmission of the movement of the drive in the other electromagnetic drive 81 is then correspondingly.

From the electromagnetic drive 82 protrudes a plunger 83, which is hingedly connected via an axis 84 with a reversing lever 85 shown here in the form of a triangle. The bell crank 85 is articulated to a stationary axle 86, and the center axes of the axles 84 and 86 are approximately on a line perpendicular to the direction of travel of the ram 83. At the reversing lever 85, a further axis 87 is articulated, to which a further plunger 88 is articulated, which is connected to the link piece 42. The reversing lever 85 is thus designed as a kind of toggle lever and also acts like a toggle lever, wherein the center lines of the axes 86 and 87 lie on a line which is parallel to the direction of movement of the plunger 83 and the driver 22. Thus, the three axes 84, 86 and 87 form an L-shaped toggle lever assembly, which converts the direction of movement P _{2 of} the plunger 83 in the direction of movement P4 of the gate piece 42. Therefore, the reversing lever 85, which is drawn triangular here, could also be designed as L-shaped toggle lever, wherein the fixed axis of the toggle lever would be in the knee. As a return element, a coil spring 89 is provided which is fixedly mounted on the axis 86 and two arms 90 and 91 which project tangentially and at an obtuse angle to each other from the coil spring 89 and there on the one hand to a stationary retaining pin 92 and on the other hand on the axis Abut 87, wherein the force effect is such that when the plunger 83 is moved against the direction of the arrow P2 in the direction of arrow P1, the coil spring 89 is tensioned. Once the solenoid system 82 is turned off or released is, the spring 89, the axis 87 against the direction of arrow P4 in the direction of arrow P4 ', so that the sliding block 42 is pressed against the gate 41.

In the same way, the arrangement is also constructed for the electromagnetic system 81, wherein only the directions of movement are reversed.

At the axis 84 engages a lever linkage 93, which has an approximately L-shaped grip member 94 which is rotatably mounted in its knee on a stationary axle 95. On the free, shorter leg 96 of the L-shaped handle 94, a transmission rod 97 is articulated, which is connected at its other end pivotally connected to the axis 84. The movement of the link piece 42 in the direction of arrow P4, ie away from the link 41, is effected by the pivoting of the handle 94 clockwise U1 about the stationary axis 95, so that the short lever arm 96 is also pivoted clockwise U1 and the transmission rod 97 in the arrow direction P1 are shifted, whereby the link piece 42 is deducted from the link piece 41 via the reversing lever 85.

Of course, the operation of the handle assembly for the drive or for the movement of the link piece 41 is analog, only vice versa. The equality of the two arrangements is underlined by the fact that the corresponding elements or components are denoted by a "'". So that the link 41 can be deducted from the link 42, the handle 94 'counterclockwise about the fixed axis 95' is pivoted, whereby the transmission lever 97 'moved in the direction of arrow P1 and the toggle lever assembly 85' and the lever 85 'is pivoted so in that the link piece 41 is pulled off the link piece 42.

Of course, this special locking conditions must be met, but here are not essential to the invention, since they must be complied with in all electrical switching devices within a switchgear.

Reference is now made to FIG. 9. This FIG. 9 shows a schematic representation of a plan view of the two link pieces 41 and 42 with the recesses 45 and 46 and the strip-like projection 48 of the second Gate piece 42. At the upper end in the region of the end walls 52 and 56 of the recesses 45 and 46, an extension 70 of the first gate piece 41 above the two end walls 52 and 56 partially covers the second gate piece 42. In the gate piece 42 is an insert screw 71, which engages in a slot 72 in the extension 70. The length of the slot 72 is sized according to the path of movement of the two scenes 41 and 42. If now the second link piece 42 is subtracted from the first link piece 41, then the second link piece 42 and thus the screw 71 moves within the slot in the direction of arrow P4, so that the screw 71 is moved within the slot 72 against the end of the slot 72, which is adjacent to the free end of the extension 70. In this position, for example due to an error in the control, the first link piece 41 can not be moved in the direction of arrow P5, because the movement of the first link piece 41, the screw 71 is hindered within the slot 72.

In the drawing Fig. 9, the extension 70 is on the side of the transmission 19 and 20 (see Fig. 1); at the opposite end of the link piece 41 a same, projecting in the same direction extension is formed, which is not shown in FIG. 9.

In the embodiments according to FIGS. 1 to 9, the drives for the link pieces are designed as electromagnetic systems. Of course, it is also possible to design the drives hydraulically or pneumatically.

In the embodiments according to Figures 2 to 8, the link pieces are each connected to a pin with the respective drive elements. Of course, a suitable guide provided so that the link pieces can be moved exactly parallel to each other and exactly transverse to its longitudinal extent. For this purpose, an additional guidance of the link pieces is required.

It is also possible to form the link pieces by two parallel sliding piece elements, which are interconnected, so that instead of a driver two driving pins are provided, between the two Sliding link elements and project in opposite directions.

The invention has been described with reference to a switching device, here a disconnector and earthing switch. Of course, it is also possible to use the slide control according to FIGS. 1 to 8 in other devices in which a specific component is to be moved into three different, precisely defined positions.

LIST OF REFERENCE NUMBERS

switchgear

movable contact piece

cable run

fixed contact piece to high voltage

fixed contact piece at earth potential

driving means

drive spindle

external thread

carriage

Zahnradgetrieberad

Zahnradgetrieberad

electric motor

takeaway

first set piece

second set piece

deepening

deepening

deepening

flat surface

fixed magnet system, electromagnetic device

line of action

driving means

first set piece

second set piece

Electromagnet system, magnet system, electromagnet device electromagnet system, magnet system, electromagnet device recess deepening

Ladder-like projection

Ladder-like projection

 Step wall from the projection 47

End surface of the recess 45

 Step wall of projection 47

 End surface of the recess 45

 Step surface wall of the projection 48

Step surface wall of the projection 48

End surface of the recess 46th

 End surface of the recess 46th

 room

 room

 room

 Return element

 Return element

 extension

 Long hole

 Tenon, screw

 Electromagnetic drive

 Electromagnetic drive

 tappet

 axis

 Umlenkhebel

fixed axis

another axis

more pestles

 coil spring

 poor

 poor

 spigot

 lever linkage

 Handle

fixed axis 96 shorter lever arm

97 transmission rod

Claims

claims 1. Drive device, in particular for a multi-position switching device, for example, for a disconnector and earthing switch whose movable contact piece (11) in different positions: switch-on position, disconnected position, grounding position and back is moved, with a driver (22) by means of a linear motion drive (18 , 16) is linearly movable, wherein a controllable slide control (41, 42) is provided, which holds the driver (22) in the different positions and locked. 2. Drive device according to claim 1, characterized in that the slide control has two link pieces (23, 24, 41, 42), of which at least one has recesses for receiving the driver. 3. Drive device according to claim 1, characterized in that one of the link pieces (23) has three recesses (25, 26, 27), in which the driver (22) is held, wherein the link piece (23) with the recesses of the other Sliding link (24) by means of a drive (29) is removable, so that the driver (22) in a separate position of the two link pieces (23,24) is freely movable. 4. Drive device according to claim 3, characterized in that the other link piece (24) on the gate piece (23) pointing to the recesses side has a flat surface and is mounted stationary. 5. Drive device according to claim 1 and 2, characterized in that the link device comprises two link pieces (41, 42), each of which a recess (45, 46) and within the recess (45, 46) each have a strip-like projection (47, 48), wherein the strip-like projections (47, 48) are offset from each other, so that when joining the two sliding pieces (41, 42), the strip-like projections overlap and between them and the end surfaces of the recesses (45, 46) each have a receiving space (57, 58, 59), which serves to receive the driver in each one of the three position. 6. Drive device according to claim 5, characterized in that the strip-like projections (47, 48) in each case by step walls (49, 51, 53, 54) are limited, of which the one step walls (51, 53) between them a receiving space (58 ) and the other step walls (49) with the end faces (50, 55; 54, 52, 56) of the depressions each form the further receiving spaces (57, 59). 7. Drive device according to one of claims 5 and 6, characterized in that at the opposite ends, based on the direction of movement of the driver (22) of the link pieces (41, 42) on one of the link pieces at least one extension (70) is integrally formed , which at least partially covers the second link piece (42), and in that an elongated hole (71) is provided in the extension (70) into which engages a pin (72), preferably a grub screw, attached to the second link piece, the length of the oblong hole (71) corresponds to the path of movement of one of the link pieces (41, 42), so that the slot (71) with the pin (72) an additional, inadmissible movement of the first link piece (41) and the second link piece (42) after regular displacement of the second link piece (42) and the first link piece (41) prevented. 8. Drive device according to one of the preceding claims, characterized in that as drive elements for the link pieces (23; 41, 42) are provided electromagnetic systems (29; 43, 44; 81, 82). 9. Drive device according to one of claims 1 to 7, characterized in that as drive elements for the link pieces (23, 41, 42) pneumatic or hydraulic systems are provided. 10. Drive device according to one of claims 8 and 9, characterized in that the directions of movement of the drive elements (43, 44) perpendicular to the direction of movement of the driver (22) on the link pieces (41, 42) act. 11. Drive device according to one of claims 8 and 9, characterized in that the movement direction of the drive elements (81, 82) parallel to the direction of movement of the driver (22) and that the movement of the drive elements (81, 82) by means of a respective deflection lever (85 , 85 ') for the movement of the link pieces (41, 42) against each other and away from each other are deflected. 12. Drive device according to claim 11, characterized in that on the reversing lever (85, 85 ') in each case a manual transmission arrangement (93, 93') is provided, each having a handle part (94, 94 '), which rotates about a stationary axis ( 95, 95 ') in a rotational movement of the reversing lever (85, 85') converts.