KR20110028296A - Control for a high-voltage/medium-voltage electrical device having a short actuation time - Google Patents

Abstract

The control has opening and closing mechanisms (MO, MF) constituted of elastic units (6, 12) i.e. actuators, for actuating a medium or high voltage electrical apparatus, and transmission elements (8, 14) constituted of flexible belts provided with flexible metallic cables locked in a connection end fitting (50) and another end fitting, respectively. The belts are made of woven or braid fabric fibers. A displacing mechanism displaces a movable part of the apparatus. The flexible belts are arranged between the actuators and the mechanism. A flexible matrix board is locked in the end fittings.

Description

Control for a high-voltage / medium-voltage electrical device having a short actuation time

The present invention relates to drive and mechanical transmission devices for high and medium voltage switchgears, in particular for high and medium voltage interrupters. The invention relates, in particular, to a drive device comprising a spring for carrying out the opening and closing cycles in the interrupter.

Known types of drive devices for high and medium voltage switchgears include springs (opening springs) for opening the interrupter and springs (called closing springs) for closing the interrupter. The closing spring is preloaded, and the closing spring remains in such a state that, when commanded to close the interrupter, the energy in the spring is released to cause the interrupter to close via mechanical coupling means. The drive device is configured such that the release of the stored energy of the closing spring is preloaded on the opening spring, which remains until it is commanded to open the interrupter.

The use of preloaded springs for opening and closing allows the operation to take place for a relatively short and constant length of time, since the operating time is mechanically dependent on the load (amount of energy) and the inertia of the moving parts in the spring. Because it is set.

One of the requirements for this type of drive device is that mechanical opening and closing may result in short switching times of less than one second (eg 90 milliseconds (ms) for closing, and for opening). Note that it should be performed within 20 to 30 ms).

In addition, the transfer elements remain preloaded until a command is given for opening or closing.

As a result, the transfer elements must be able to continue to store mechanical energy in this way for a very long time.

In addition, the transmission elements are subjected to enormous forces over a very short time, especially in the region of fastening to the spring and the corresponding shaft. During the opening operation, all the energy of the spring is released momentarily, from which release a significant tensile stress force is generated, which forces between the fixing element between the transmission element and the opening spring and between the transmission element and the open shaft. The fixing part of is applied to the transmission element in the region of both. The tensile stress may amount to tens of kilonewtons (kN), typically 30 kN.

Therefore, the transmission elements and their engagement to the springs and shafts are designed to withstand the stresses they are associated with.

In addition, such a drive device may be subjected to a stress of weather and the interior of the drive device is configured to withstand temperatures in the range of -50 ° C to + 50 ° C and to allow occasional condensation. Should be.

Such drive devices are also intended to be used for a very long time, for example for decades.

Finally, the drive devices are safety equipment and their reliability must be ensured.

As a result, such drive devices, in particular the elements to which the forces of opening and closing are transmitted, are designed to ensure reliable operation over a very long time under severe conditions in terms of stresses and external conditions applied.

For example, it is known to use chains or cables of metal rollers as transmission elements, such as the drive device described in document FR # 2 # 778 # 492.

The roller chains and cables provide safety over a long period of time.

However, they have a large mass, which reduces the operating speed of the interrupter.

In addition, roller chains require grease to prevent possible malfunctions in the transmission of forces. They are also vulnerable to erosion, which can also cause malfunction of the drive. If a single cable is provided for the transmission of control signals, the diameter of the cable must be large enough to withstand the forces applied thereto. This large diameter increases the rigidity of the cable, which leads to the need to use a large diameter guide pulley (guide pulley), which increases the space conditions for such a drive device.

Accordingly, the present invention aims to provide a fully reliable drive device for a high voltage or medium voltage switchgear, in which the inertia of the moving parts is smaller, thereby reducing the characteristic time or operating time, and also Maintenance requirements and costs are reduced compared to known types of drive devices.

The above object is achieved by a drive device for a high voltage or medium voltage switchgear, the drive device comprising a transmission element comprising a flexible belt between the opening actuator and the opening shaft, the closing actuator and the closing shaft. There is also a delivery element comprising a flexible belt in the liver.

This belt may be a strap made of a plurality of parallel cables or woven fibers, the cables being embedded in a flexible matrix over at least a portion of their length.

The mass of the transmission element can thus be reduced, thereby reducing the operating time. In addition, it is no longer necessary to provide grease of the transfer element, thereby facilitating maintenance. In addition, the cost is lower than that of a drive device of the type having a chain.

The use of such a force transmission element is made possible by providing special connectors suitably adapted at positions subject to stresses exerted by the actuators.

A belt comprising a plurality of cables has the following advantages.

It is flexible so that small diameter return pulleys can be used. The radius of curvature can be optimized by determining the number of cables arranged parallel to the diameter of the cables. Therefore, the overall size is reduced.

The belt requires little or no maintenance.

Operating time is reduced because the belt inertia is reduced.

The present invention therefore mainly provides a drive device for a high voltage and a medium voltage switchgear, the drive device including at least one actuator for opening / closing the interrupter of the device, and also moving the movable part of the interrupter. A mechanism suitable for this purpose and a force transmission element are included, the transmission element comprising a flexible drive belt.

The flexible drive belt is for example disposed between the mechanism and the actuator.

The belt may have end connectors for coupling to the mechanism and actuator at two ends of the belt, each end connector having a fixed end for fixing to the end of the belt, and a rod extending in the direction of movement of the belt or And a securing end for securing the connector with respect to the pin perpendicular to the movement.

In one embodiment, the belt includes a plurality of cables disposed parallel to each other, the cables being embedded in the flexible matrix over at least a portion of their length. The matrix can then extend continuously over much of the length of the cables.

The matrix can be made of a thermoplastic material, for example polyethylene.

The cables are preferably held and held in the end connector by stamping.

The matrix can also be held and held in the end connectors.

In one embodiment, at least one of the end connectors is formed with bores, the axes of the bores being directed in the direction of movement of the belt, each bore receiving the free end of the cable, each cable in place by stamping. Is retained. At least one of the end connectors may have a transverse hole extending at right angles to the axes of the bores and parallel to a plane comprising the axes of the bores for cables, wherein a pin is introduced into the transverse hole, The pins have a diameter equal to the diameter of the transverse hole to grip the ends of each cable between the periphery of the corresponding bore and the pins, providing a preassembly prior to final assembly by stamping.

Advantageously, at least one of the end connectors has an inclined surface with respect to the plane comprising the axes of the bores, so that the holding force for the cables obtained by stamping is more at the closed end of the bores than at the open ends of the bores. Larger on the side of the field, the face is inclined at an angle of 1.5 ° with respect to the plane containing the axes of the bores.

In another embodiment, the belt is made of woven or braided fabric fibers. These textile fibers are for example polyethylene, polyester, or aramid.

In a belt comprising woven or braided fibers, at least one of the end connectors may comprise a first mandrel and a second mandrel perpendicular to each other and parallel to each other, wherein the two mandrels It is fixed to the fixing element of the end connector for fixing to the actuator or the mechanism, each end of the belt is wound around the mandrel of the end connector, and a second mandrel is disposed between the first mandrel and the fixing element of the end connector And the end portions of the belt overlap to form a closed loop, the end portions of the belt being secured to the end connector, the loop having an outer side and an inner side, the loop having its inner surface in contact with the first mandrel; A loop passing around the first mandrel and passing around the second mandrel so that its outer surface is in contact with the second mandrel Min is the superposition of the belt has a thickness of two times, the ends of the loop formed by the free end of the belt passes out of the end connector by extending along the first mandrel.

The at least one actuator may comprise a spring, the mechanism comprising a lever rotatably fixed to a shaft adapted to engage a movable portion of the interrupter.

The drive device may further comprise coupling means for coupling the spring and the belt together for the transfer of force between the spring and the belt along the axis of the spring.

The coupling means for engaging the belt and the spring together may comprise a truncated conical member mounted in the spring, which abuts the winding at the end of the spring through the base portion of the truncated conical member, The frustoconical member is coupled to the end connector via a threaded rod that is screwed into the end connector, and the threaded rod is secured to the frustoconical member by a first nut.

It may be preferred that the drive device further comprises a locknut means comprising a tube and a second nut, the tube being gripped between the first nut and the second nut. Advantageously, the length of the tube is at least five times the diameter of the threaded rod.

The drive device of the present invention may further comprise coupling means for engaging the belt and the lever together, the coupling means providing a pivot connection about an axis parallel to the axis of the shaft.

The lever may have a protruding mandrel parallel to the axis of the shaft, the end connector having a bore perpendicular to the direction of movement of the belt, the bore receiving the mandrel, and the end connector being rotatable about the mandrel. .

The end connector may preferably comprise two parts hinged to each other by a coupling rod, the axis of the hinge being perpendicular to the surface of the belt.

The actuator is for example an actuator for opening the interrupter, the lever is an opening lever, the shaft is the main shaft, and the drive device further comprises a second actuator constituting the actuator for closing the interrupter.

The closing actuator may comprise a spring connected to the closing lever via the belt, the closing lever being fixed to the closing shaft parallel to the main shaft to which the opening lever is fixed, the closing lever being rotated by a cam. And the cam is adapted to act against the opening lever to cause the interrupter to close.

The drive device may further comprise a drive wheel with gear teeth for driving the closing lever to rotate, the gear wheel being engaged with a gear train driven by an electric motor to load the spring.

The present invention also provides a high voltage or medium voltage switchgear having the drive device of the present invention.

The invention further provides a method of assembling a drive belt and an end connector together, the belt comprising a plurality of cables arranged parallel to each other, the cables being embedded in a flexible matrix over at least a portion of their length. The free end of the cables is not embedded in the matrix, and bores are formed in the end connector, the number of bores being equal to the number of cables, and the method comprises the following steps:

Introducing one end of each cable into a separate bore; And

Applying a stamping force to the end connector, at right angles to the cables, in the bores in such a way as to primarily modify the bores by stamping.

The method may further comprise pre-assembling the cables in the bores prior to final assembly.

The method may further comprise applying a sealing means to the joint between the end connector and the belt, for example by applying a polyurethane type paste.

According to the present invention, a fully reliable drive device for a high voltage or medium voltage switchgear is provided, which reduces the inertia of moving parts, reducing characteristic time or operating time, and also of known type. Maintenance requirements and costs are reduced compared to drive devices.

The invention will be more clearly understood from the following detailed description with reference to the accompanying drawings.
1 is a perspective view of a drive device for a high or medium voltage switchgear apparatus of one embodiment according to the present invention;
FIG. 2 is a perspective view showing a part of the drive device shown in FIG. 1; FIG.
3 is a perspective view of the interrupter-closing actuator means only;
4 is a partial perspective view of one embodiment of the coupling between the closing spring and the belt;
FIG. 5 shows the coupling between the belt and the elements of the actuator, which is a detailed view taken from FIG. 3;
6 is a sectional view showing one embodiment of a belt having features of the present invention;
7A-7C are cutaway views of one embodiment of a guide pulley used in the drive device of the present invention;
8A-8C are perspective, top, and side views illustrating one example of an end connector particularly suitable for securing the belt shown in FIG. 6;
FIG. 9A is a longitudinal sectional view and FIGS. 9B and 9C are perspective views, showing another example of an end connector which is particularly suitable for fastening a belt, which is a strap made of woven textile fibers;
9D and 9E are perspective and side views of another form of the end connector shown in FIGS. 9A to 9C.

1 and 2 show a drive device according to an exemplary embodiment of the present invention, the drive device having springs as an opening actuator and a closing actuator. Of course, it should be understood that drive devices using different actuators and different mechanical couplings do not depart from the scope of the present invention.

This particular example drive device of the invention is for example a circuit breaker (opening mechanism (MO) for opening the interrupter for a circuit breaker (not shown), and for closing the interrupter). It includes a closing mechanism (MF), which is laterally arranged in the casing 2. The two mechanisms MO, MF are coupled to the main shaft 7. The main shaft itself is coupled to the moveable part of the interrupter.

The opening mechanism MO comprises: elastic means 6 adapted to release mechanical energy in response to a command to store mechanical energy by deformation and to open the interrupter; A transmission element 8 for transmitting a force applied by the elastic means 6; And a lever 10 rotatable with the main shaft 7. In the example shown, the resilient means 6 is presented as a spiral spring which is kept in a preloaded state.

One of the ends (not shown) of the transmission element 8 is coupled to one end of the spring 6, and the other end 8.2 of the transmission element is coupled to the lever 10, by means of a spring via the transmission element. The force applied to the lever causes the main shaft to rotate in a given first direction of rotation, as soon as the first locking system (not shown) releases the lever 10, causing the interrupter to open.

The closing mechanism MF comprises: elastic means 12 adapted to release mechanical energy in response to a command to store mechanical energy by deformation and to close the interrupter; And a transmission element 14 for transmitting the force applied by the elastic means 12; A cam 18, called a closing shaft and fixed to a shaft 19 parallel to the main shaft, which is rotatable with the closing shaft and cooperates with the lever 10. In the example shown, the resilient means 12 is a spiral spring that is kept preloaded.

The transfer element 14 is coupled to the end of the spring 12 via one end 14.1 and to the disk 20 via the other end 14.2, the transfer element being rotated with the closing shaft. The force applied to the disk 20 by the springs causes the cam to rotate as soon as the locking means 11 releases the disk 20 to lock in the closed position. This causes the main shaft 7 to rotate in the second rotational direction opposite to the first rotational direction, in cooperation with the lever 10, so that the interrupter is closed.

The disk 20 has a toothed perimeter, which is a gear train driven by an electric motor (not shown) for the purpose of preloading the closing spring 12. It is configured to cooperate with 21).

According to the invention, the transfer elements 8, 14 are flexible straps or belts, which have a substantially flat shape with a cross section whose thickness is less than the width.

In one embodiment, the belt can be formed, for example, by weaving or braiding textile fibers, such fibers being, for example, polyethylene fibers or aramid fibers, specific examples being KEVLAR: Registered trademarks).

In another exemplary embodiment, the belt may comprise a plurality of metal cables, for example steel cables, the cables being arranged parallel to each other and over at least a portion of their length, for example. Embedded in a thermoplastic flexible material such as polyurethane. An example of this type of belt is shown in FIG. 6, where one can see the cables 22 arranged parallel to each other with a matrix 24 of flexible material.

The matrix 24 holds the cables together, facilitates the handling of the belt and reduces the stress resulting from the surface pressure of the cables.

Advantageously, the matrix 24 can be configured to cover the entire length of the cables, in which case the cables are protected from erosion.

As described below, a guide pulley for guiding the belt is provided. In a variant embodiment, the matrix 24 is arranged only around the area of the cables and not sliding on the pulleys, which (partial) members of the matrix further increase the flexibility of the belt in the bent area of the belt. The shape of the guide pulley (see FIG. 7C) may be adapted for this variant.

The following describes in detail the coupling between the belt and the spring and other mechanical elements.

The following description is based on the closing mechanism, but the same applies to the opening mechanism.

Only a closing mechanism is shown in FIG. 3, a portion of which is shown cut in the longitudinal direction.

The first end 14.1 of the belt 14 is attached to one end of the spring 12 by means of coupling 26.

Coupling means 26 ensures alignment between the axis of the spring and the portion of the belt attached thereto, thereby ensuring that force is transmitted between the belt and the spring along the axis of the spring.

The engaging means comprises a truncated conical member 28, wherein the truncated conical member 28 is disposed inside the spring, and the first longitudinal end of the base portion 30 of the member 28 is Abuts the endmost turn 32 of the spring. Preferably, the base portion 30 has a stepped shape and includes a relatively small cylindrical portion 33 so that the second spring can be fitted, the second spring having a first spring. It has a smaller diameter and is disposed coaxially in the first spring.

The truncated conical member has a passage 35 at its second longitudinal end.

The coupling means 26 also includes a rod 34, which extends through the passage 35 to join the first end 14.1 of the belt 14 to the truncated conical member 28.

In the example shown, the rod 34 is threaded and screwed into the end connector 36 through one end 34.1, which end connector 36 has a threaded bore 38 and also It is fixed to the first end 14. 1 of the belt 14.

A first nut 40 is screwed into a threaded rod 34 within the interior of the truncated cone member 28 and abuts against the frustoconical end wall. In the example shown, a washer 42 is disposed between the first nut 40 and the closed end of the truncated cone.

For the purpose of preventing accidental loosening of the nut 40, it may be advantageous to provide a locknut means 44.

In the example shown, the lock nut means comprises a tube 46 and a second nut 48, which surrounds the rod 34 and the first nut 40 and the second nut. It is compressed and mounted between 48.

The tube 46 preferably has a length that is at least five times the diameter of the screw 34. This length prevents loosening of the assembly.

The minimum length of the rod 34 is that firstly the spring can be assembled with pre-tension from the rest position, and secondly the pre-tension force of the spring is adjusted to the correct value. The tube 46 and locking nut 48 are then selected to enable the fitting.

As shown in FIG. 4, it is desirable for the end connector 36 to have a through hole 49 that is open into the bore 38, which allows a tool to be inserted to locally deform the rod. This provides a simple way to prevent the rod 14 from being unscrewed. Any other means for preventing the rod 34 and the end connector from disengaging from each other can be contemplated.

The second end 14.2 of the belt 14 is fixed to a pivoting member, which in this particular example of the closing mechanism MF is the disk 20. Therefore, the engagement between the belt 14 and the disc is made in such a way as to accommodate its rotation without its own movement.

To this end, the end 14. 2 comprises an end connector 50 with a bore 52 perpendicular to the direction of movement of the belt and parallel to the axis of rotation of the disc 20, which bore 52 has a disc axis. and a mandrel 54 parallel to the disk axis and fixed to the disk. The end connector 50 can be freely rotated in the mandrel 54, thus forming the axis of rotation.

End connector 50 and mandrel 54 are retained on the disk by studs 56, as can be seen in FIG.

In another embodiment, shown in FIG. 5, a degree of freedom is added to the end connector 50 ′, which end connector is not integrally formed here but is fixed to the belt 58. ), A second rod 60 adapted to be rotatably mounted to the mandrel 54, a joining rod 62 for joining together the first portion 58 and the second portion 60, and the second portion. A pivot axle 63 defining an axis of rotation of the engaging rod on 60, the axis being perpendicular to the axis of the bore 52 receiving the mandrel 54.

This additional degree of freedom gives the additional flexibility to allow the load to be balanced over the entire width of the belt, in particular a belt comprising a plurality of parallel cables, and also allows the load to spread equally across all cables. Let's do it. This then makes it possible to increase the load which can be applied to the belt.

Advantageously, the end connectors 36, 50 are made of steel to withstand any applied impact.

The following describes an example of fixing the core of the belt to the end connector.

Preferably, the cables of the belt are gripped in the end connectors 36, 50 to ensure a completely dependent fixation of the belt on the end connector.

4 and 8a to 8c show an attachment of a type particularly suitable for a belt comprising a plurality of parallel cables. The end connector 36 has a plurality of blocked bores 64 at the opposite end of the end where the bore 38 is formed, each of which blocked bores receives one end of the cable, the cables being securely therein. Is retained. The axis of the bores 64 is included in a plane that includes the axis of the bore 38.

The bores 64 are parallel to each other, each of which constitutes a housing for the end of the cable. The bores are arranged in relation to each other in a manner corresponding to the relative distance of the cables in the belt.

8b shows an end connector without a cable.

Preferably, the open or insertion ends of the bores 64 can be chamfered, to facilitate insertion of the cables into the bores.

The ends of the cables are held in the bores by deformation of the bores by stamping, which deformation of the bore causes the cables to be firmly gripped.

The diameter of each bore 64 will be made slightly larger than the diameter of the cables.

The deformation may preferably be intermittent and is performed along the bores. The force is applied against the face 69 of the end connector parallel to the plane including the axis of the bores, and along the axes of the bores, but not across the entire surface of the end connector. Therefore, the material of the end connector, for example steel, is deformed around the ends of the cables and fills at least part of the void space between the wires constituting the cables and the inner surface of the bore.

8A, there is shown a deforming tool (DF) having no flat surface, the surfaces of the deforming tool each extending parallel to the axis of the bore 64 and protruding fingers parallel to each other. Formed by the projecting fingers 65.

Advantageously, more gripping occurs in the area of the base 64a of the bore than in the area of the open end 64b of the bore; This improves fixation.

As can be seen in FIG. 8C, this can be achieved, for example, by making the surface 69 on which the strain is applied is inclined with respect to the plane on which the strain is applied, the inclination being for example 1.5 °. Alternatively, the tool applying the deformation may be inclined at such an angle.

The impression made on the end connector is, for example, about 0.5 times the cable diameter.

In carrying out the assembly operation, it is particularly advantageous to provide a means for retaining the ends of the cables in the bores 64 prior to the deforming step, so that one of the cables can be dislodged or moved during the deforming step of the end connector. The possibility is avoided.

As shown in FIGS. 8A-8C, this is accomplished by forming a bore 70 that is perpendicular to the bores 64 and extends radially into each of the bores 64. When the cables are located in the bores 64, a dowel 72 having a diameter equal to the diameter of the transverse bore 70 is introduced into the bore and slightly deforms the cables, with the cables and the end connector already present. Makes it possible to assemble. For example, the dowel 72 can penetrate approximately 0.3 mm into the bores 64.

The pin 72 also improves the tensile strength of the bond between the cables 72 and the end connector 36.

It may also be possible to prepare a preassembly by adhesive bonding, where the adhesive is preferably only partially applied to the base 64a of the bores 64, for example.

According to this assembly method, the strength in the region of the gripping zone is at least equal to that of the belt itself.

A seal may be provided to protect the cables from erosion in the region of the gripping zone of the cables, the seal being for example polyurethane paste on the sides of the end connector 36 and the sides of the matrix 24. By applying The matrix 24 may be arranged to be gripped directly in a housing (not shown) that is formed in the end connector and forms a slot upstream of the bores.

9A-9C show an example of fastening a belt made of woven fiber.

As can be seen from FIGS. 9A-9C, the belt is wound around two mandrel in the end connector.

The end connector 36 'includes a stirrup member 74 with two parallel sidewalls 76, the sidewalls of the base wall 78 having a bore 38'. Screwed rods 34 which are joined together, and which are adapted to be fixed to the elements of the drive device in the bore. End connector 36 ′ has a first mandrel 80 and a second mandrel 82 formed by short pins and parallel to each other, the ends of each of the short pins being fixed to sidewall 76, The second mandrel is disposed between the base wall 78 and the first mandrel 80.

The following describes how the belt is wound around the mandrel 80, 82. The end portion of the belt is folded in two, and the free end of the belt is hemed, for example by adhesive bonding or stitching, to form a closed loop 90. The belt receives the first mandrel and the two belt strips are placed together and wound around the second mandrel, then exit from the end connector by passing along the first mandrel.

The loop is formed after or before the belt is wound over the mandrels, and therefore it is the first mandrel that is made detachable so that it can be inserted into the loop.

The tensile stress acting on the end connector 36 'in the opposite direction to the force applied to the end connector 36' by the belt is exerted on the same plane as the plane that receives the end of the loop exiting the end connector 36 '. All.

9B and 9C are perspective views of the end connector of FIG. 9A, with no belts shown.

In this example, the side walls 76 have holes into which the longitudinal ends of the mandrel are fitted, each mandrel having a shoulder 88 at the first end and a screwed bore 89 at the second end. In this case, it is possible to fit the bolt 91 for holding the mandrel in the transverse direction. In the example shown, the bolt has a hexagonal head.

9d shows an end connector 36 "which is a modified form of the end connector 36 '. The end connector 36" shows the end connector 36' in terms of the manner in which the belt is substantially secured thereto. Is different from

In this form, the end connector 36 "is substantially perpendicular to the first plate portion 100 and the first plate portion 100 for securing the belt to the end connector and is end connector 36". A second plate portion 102 which enables the coupling to a suitable element of the drive device.

In this example, the second plate portion 102 has a bore (not shown) in which a threaded rod 34 is screwed into which is fixed to a suitable element of the drive device.

The first plate portion 100 has an orientation with respect to the second plate portion 102 in a manner that includes the axis of the threaded rod 34.

In the example shown, the end connector is preferably made in one piece by press-forming a sheet steel blank; A profiled portion 104 connects the first plate portion 100 with the second plate portion; The bend 104 has a shape that makes an angle to space the second plate portion 102 relative to the first plate portion, such that the axis of the threaded rod 34 is the plane of the first plate portion 100. This is as shown in FIG. 9E, in which the end connector 36 ″ is shown as a side view and partially cut in the longitudinal direction.

The first plate portion 100 includes means for securing the belt by winding the belt around the end connector, which is similar to the manner of securing to the end connector 36 '.

To this end, the first plate portion 100 has three long holes 108, 110, 112, each of which is perpendicular to the axis of the belt, the three holes being wound around the belt 14. Loss is separated by bar elements 114 and 116.

The holes are formed, for example, by stamping with a punching tool.

The winding of the belt is the same as that of FIG. 9A, where the bar element 114 has the same function as the mandrel 80 and the bar element 116 has the same function as the mandrel 82. However, it is advantageous to allow the belt to pass back into the hole 103 after the belt has been wound around the bar elements 114, 116, which then passes along the lower side of the first plate portion 100.

The end connector 36 "is very easy to fabricate because only one press-forming and stamping step is required.

Although only one end of the belt fixed to the end connector has been described above, the other end of the belt may naturally also be configured with the same type of end connector.

2 shows a reinforcing lever 66 fixed to the disk 20, wherein the second end 14.2 of the belt is fixed to the lever 66 by an end connector 50. The lever 66 assists in the transmission of force by reducing the flexibility of the disk 20.

As mentioned above, the belts are guided by guide pulleys 68 for changing the direction of the belts.

The minimum radius of the pulley is calculated as a function of the diameter of the belt that the pulley guides. Here, according to the present invention, in a belt including a plurality of cables each having a small diameter compared to when there is only one large cable, a small diameter pulley can be used. Thus, the overall size of the drive device can be reduced.

7A-7C show some embodiments of these pulleys. The pulleys are mounted on the rolling bearings 92.

The surface 94 of the pulleys in contact with the belt may be of various types. It may be smoothly formed by a cylinder of circular cross section with side portions by two side guides 96 as shown in FIG. 7A.

The surface may have a form that is substantially inflated at its center as in surface 94 'in FIG. 7B, which improves guidance to the belt.

In FIG. 7C, the surface 94 ″ has an annular groove 98 coaxial with the axis of the pulley, each of which is adapted to receive a portion of the cable at the portions of the belt to which the cables are exposed.

(See FIGS. 1 and 2) The engagement of the belt 8 to the lever 10 takes place in the same way as the end connection of the belt 14 to the disc 20, ie the pivot is parallel to the main axis. By an end connector 77 mounted for rotation about a pin. In this particular example, this pivot pin is mounted between two plates 81 that are part of the lever 10.

The engagement of the belt 8 to the spring 6 is similar to the engagement between the belt 14 and the spring 12, ie they are joined together by a truncated cone member and a threaded rod (see FIG. 3).

It should be clearly understood that a belt with two end connectors having a different structure at the two ends of the belt is also within the scope of the present invention.

In the following, the operation of the driving device described above as an example will be described.

The motor drives the geared disk 20 to rotate via the gear train 21, so that the mandrel 54 is driven to rotate around the closing shaft 19. This causes the second end 14.2 of the belt 14 to move, which is the direction in which the first end 14.1 of the belt also moves to compress the spring 12.

The first locking device 11 is configured to prevent rotation of the disk 20 when the level of energy stored in the spring 12 is sufficient, in which case the rotational movement of the disk is at top dead center. This is when a few degrees have passed.

Given a command to close the interrupter, the first locking device 11 releases the disk 20, which is driven to rotate by a force applied by the spring 12 via the belt 14 , The closing shaft 19 and the cam 18 are driven. The cam 18 then comes into contact with the lever 10, the lever pivoting to rotate the main shaft 7 in the second direction of rotation, which causes the movable element (contact part) of the interrupter to move, closing the interrupter. Let's do it. The second locking device locks the lever 10 when the closing position is reached by the interrupter contact.

At the same time, the movement of the lever 10 applies a pulling force to the belt 8, which causes the opening spring 6 to be compressed.

Subsequently, the motor is driven to reload the closing spring as described above.

When given the command to open the interrupter, the second locking device releases the lever 10, which is driven to rotate by a force applied to the spring 6 via the belt 8, so that the main shaft 7 The interrupter is opened by rotating in the first rotational direction.

The high and medium voltage drive devices of the present invention using drive belts as transmission elements provide reliable operation over a sufficiently long period of time.

In this respect, the drive device of the present invention has the advantage that it operates without requiring lubrication, thus requiring no maintenance and eliminating the risk of abrasion due to poor lubrication.

In addition, the transfer elements are not susceptible to erosion.

The transmission elements have a smaller mass than the roller trains generally used, so that the amount of energy required for the opening and closing operations is relatively small. In addition, since the moving mass is reduced, the time of opening and closing can also be reduced to approximately 3 ms to 4 ms.

In addition, the overall size of the belt is smaller than that of the roller train, so that the overall size of the drive device itself can also be smaller.

Finally, the belt drive components have a much lower first cost than those generally used, which makes it possible to reduce the first cost of the drive device itself, which is of the type using two force transmission elements. Above all, the driving device is remarkably distinguished.

The above description has been made with reference to the case where a flexible belt is used for the force transmission between the levers of the control mechanism and the actuator. However, it should be clearly understood that the belts described above can also be used in a force transmission chain between a moving contact of a high voltage or medium voltage switch device, for example a spring-in actuator, to which the belts are tensioned. For example, the belts described above can be used to transfer forces between the circuit breaker and the control mechanism, in which case the opening spring is arranged in the area of the circuit breaker.

6: elastic means 7: main shaft
8: transmission element 10: lever
11: locking means 12: elastic means
14: transmission element 18: cam
19: shaft 20: disc
MO: opening mechanism MF: closing mechanism

Claims (29)

A drive device for a high and medium voltage switchgear, the drive device comprising at least one actuator (6, 12) for opening and closing an interrupter of the device. A mechanism adapted to move the movable portion of the interrupter, and a force transmission element 8, 14 connecting the two zones to which the force must be transmitted; The transmission element comprises a belt comprising a plurality of flexible longitudinal elements intended to connect two zones to which a force must be transmitted, and at least one flexible transverse element extending between the longitudinal elements. A drive device for a high voltage and medium voltage switchgear formed by a flexible transversal element. The method of claim 1,
The flexible drive belt is disposed between the mechanism and the actuator (6, 12), drive device for high voltage and medium voltage switchgear. The method according to claim 1 or 2,
The belt 8, 14 has end connectors 36, 36 ′, 36 ″, 50, 50 ′ for coupling to the mechanism and to the actuators 6, 12 at both ends of the belt and Each end connector has a fastening end for fastening to the end of the belt and a rod extending in the direction of movement of the belt or a fastening for securing the connector to a pin perpendicular to the movement. A drive device for high voltage and medium voltage switchgear having an end portion. The method according to any one of claims 1 to 3,
Belts 8 and 14 comprise a plurality of cables arranged parallel to each other, the cables being embedded in a flexible matrix 24 over at least a portion of their length, high voltage and medium voltage switches. Drive mechanism for gears. The method of claim 4, wherein
Wherein the matrix (24) extends continuously over a major portion of the length of the cables. The method according to claim 4 or 5,
Drive device for high voltage and medium voltage switchgear, wherein the matrix (24) is made of thermoplastic material, for example polyethylene. The method according to any one of claims 4, 5, and 6 associated with claim 3,
The cables are held and held in end connectors (36, 36 ', 36 ", 50, 50') by stamping. The method of claim 7, wherein
The matrix device (24) is held and held in the end connectors (36, 50, 50 '). The method according to claim 7 or 8,
Bore 64 is formed in the end connectors 36, the axes of the bores being oriented in the direction of movement of the belt, each bore 64 receiving the free end of the cable, The drive device for high voltage and medium voltage switchgear, wherein the cable is held in place by stamping. The method of claim 9,
Each end connector 36 has a transverse hole 70 extending perpendicular to the axes of the bores 64 and parallel to the plane comprising the axes of the bores 64 for cables. Pin 72 is introduced into the transverse hole 70, the pin having a diameter equal to the diameter of the transverse hole 70 such that the ends of each cable between the periphery of the pin 72 and the corresponding bore 64. A drive device for high and medium voltage switchgear, which is gripped to provide a pre-assembly prior to final assembly by stamping. The method of claim 10,
The end connectors 36 have an inclined face 69 with respect to a plane comprising the axes of the bores 64 such that the holding force in the cable obtained by stamping is on the open ends 64b side of the bores 64. Larger at the same side as the closed ends 64a of the bores 64 than in the plane, the face being inclined at an angle of for example 1.5 ° with respect to the plane containing the axes of the bores 64, high voltage and medium voltage Drive gear for switchgear. The method according to any one of claims 1, 2, and 3,
Drive device for high and medium voltage switchgears, wherein the belts (8, 14) are made of woven or braided fabric fibers. The method of claim 12,
Textile fibers are made of polyethylene, polyester, or aramid, drive devices for high voltage and medium voltage switchgear. The method according to claim 12 or 13, wherein
Each end connector 36 ', 36 "includes a first axle 80, 114 and a second axle 82, 116 perpendicular to the direction of movement of the belt and parallel to each other; Two mandrel 80, 82, 114, 116 are fastened to fastening elements 78, 102 of the end connector for fastening to the mechanism or actuator, each end of the belt being end connector 36. ', 36 ") around the mandrel 80, 114, 82, 116, and the second mandrel 82, 116 is wound around the first mandrel 80, 114 and the end connectors 36', 36". Disposed between the fastening elements 78, 102, the end portion of the belt being folded, the end portion of the belt being fixed to the end connector to form a closed loop 90, the loop 90 being inward Having a face and an outer face, the loop 90 passes around the first mandrel 80, 114 such that its inner surface is in contact with the first mandrel 80, 114, and whose outer surface is the second mandrel. The loop portion passing around the second mandrel 82, 116 to contact 82, 116 and passing around the second mandrel 82, 116 has a double thickness with overlapping belts, An end portion of the defined loop (90) extends along the first mandrel (80, 114) to pass out of the end connector (36 ', 36 "). The method according to any of the preceding claims,
The at least one actuator comprises a spring 6, 12, the mechanism being rotatably fixed to a shaft 7, 19 adapted to engage the movable portion of the interrupter 10. Drive device for high voltage and medium voltage switchgear. The method of claim 15,
Further comprising coupling means 26 for coupling the spring 12 and the belt 14 together to transmit force between the spring 12 and the belt 14 along the axis of the spring 12, Drive device for high and medium voltage switchgear. 17. The method of claim 16,
Coupling means 26 for coupling belt 14 and spring 12 together comprises a frusto-conical member 28 mounted in spring 12, the frustoconical member being the base of the frustoconical member. Abutting the end winding portion 32 of the spring 12 through the portion 30, the truncated cone member 28 is passed through the end of the end connector (36) through the threaded rod 34 screwed to the end connector (36). 36. A drive device for a high voltage and medium voltage switchgear, coupled to 36, wherein the threaded rod is fixed to the truncated cone member by a first nut. The method of claim 17,
The drive device for the high and medium voltage switchgear further comprises a lock nut means comprising a tube 46 and a second nut 48, the tube 46 having a first nut 40 and a second nut 48. Drive device for high voltage and medium voltage switchgear held between. The method of claim 18,
The length of the tube (46) is at least five times the diameter of the threaded rod (34), drive device for high voltage and medium voltage switchgear. The method according to any one of claims 15 to 19,
The drive device for the high and medium voltage switchgear comprises a coupling means for coupling the belts 8, 14 and the levers 10, 66 together and pivoting about an axis parallel to the axes of the shafts 7, 19. Further comprising, the drive device for high voltage and medium voltage switchgear. The method of claim 20,
The levers 10, 66 have a protruding mandrel parallel to the axes of the shafts 7, 19, and the end connectors 50, 50 ′ have a bore perpendicular to the direction of movement of the belts 8, 14 ( 52), wherein the bore (52) receives a mandrel and the end connector (50, 50 ') is rotatable around the mandrel. 22. The method according to claim 20 or 21,
The end connector comprises two parts 58, 60 articulated with each other by a coupling rod 62 and the articulating pin 63 is perpendicular to the surface of the belts 8, 14, with a high voltage and a medium voltage. Drive equipment for pressure switchgear. The method according to any one of claims 15 to 22,
The actuator is an interrupter opening actuator, the lever 10 is an opening lever, the shaft 7 is a main shaft, and the driving device for the high voltage and medium voltage switchgear further comprises a second actuator constituting the interrupter closing actuator. Drive device for high voltage and medium voltage switchgear provided. The method of claim 23,
The closing actuator comprises a spring 12 connected to the closing lever 66 via the belt 14, the closing lever 66 for closing parallel to the main shaft 7 to which the opening lever is fixed. Fixed to the shaft 19, the closing lever 66 is fixed to the cam 18 for rotation with the cam, and the cam is adapted to act on the opening lever 10 so that the interrupter is closed. And a drive device for a medium voltage switchgear. The method of claim 24,
The drive device for the high voltage and medium voltage switchgear further includes a toothed driving wheel 20 with gear teeth for driving the closing lever 66 to rotate, the gear wheel formed drive wheel 20 having an electric motor. Drive device for a high voltage and medium voltage switchgear, in engagement with a gear train (21) driven by the spring to put the spring (12) in a load state. A high voltage or medium voltage switchgear comprising a drive device for a high voltage and medium voltage switchgear according to any one of the preceding claims. A method of manufacturing a drive device for a high voltage and medium voltage switchgear according to any one of claims 1 to 25 in connection with claims 3 and 4, the method of manufacturing the drive belt and the end connector together. Wherein the belt comprises a plurality of cables disposed parallel to each other, the cables being embedded in the flexible matrix 24 over at least a portion of their length, and the free ends of the cables being dug in the matrix. Not buried, end connectors are formed with bores, the number of bores being equal to the number of cables,
The method is:
Introducing one end of each cable into each bore; And
Applying a stamping force, at right angles to the cables, to the end connector at the bores in such a way as to deform the bores primarily by stamping. . The method of claim 27,
Pre-assembling cables in said bores prior to final assembly. The method of claim 27 or 28,
Further comprising applying a sealing means to the junction between the end connectors and the belt, for example by applying a polyurethane type paste. Manufacturing method.

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