FR2805921A1 - DEVICE FOR CONTROL MECHANISM OF ELECTRICAL APPARATUS AND CONTROL MECHANISM PROVIDED WITH SUCH A DEVICE - Google Patents

Abstract

The command circuit breaking mechanism has a switching module (1) activating a shaft (3) rotating a cam (4). There is a spring return mechanism. The spring return sub assembly has a deadener (37) and spring mechanism (36) held in a hollow section. The mechanism slides on a piston rod (25).

Description

The invention relates to a device intended to equip a

  spring control of electrical power equipment, such as

  for example a medium or high voltage circuit breaker.

  As is known, this type of electrical equipment conventionally comprises a switching module controlled by a control mechanism where a latching-triggering arrangement is more specifically responsible for switching the module from one position to another by acting on it by means of the '' through a mechanical control link to switch it on or off and therefore on and off

  and o another arrangement is used to arm the previous one.

  A control mechanism of this kind is described in particular in a European patent 651409 in conjunction with FIG. 1 of this patent. It includes in particular a latching-triggering arrangement including a main operating shaft, called a circuiting shaft, on which are fixed various control levers which allow this shaft in particular to act on the module and to be driven in rotation under the action of a cam in a first determined direction, from a starting position for which the module is in a first state to a position for which the module reaches a second state. This rotation is effected by pressing the cam on one of the levers carried by the main shaft and against a return spring which is capable of rotating this main shaft in the opposite direction to the previous one and which acts by the through another lever. The reverse rotation of the main shaft is only possible under certain conditions which are developed further on. End-of-travel damping means are also provided which are made integral with the main shaft and in particular a damper acting on this shaft by a lever different from the previous ones when the shaft returns to the starting position. This kind of spring control mechanism has the disadvantage30 of involving a relatively large number of different parts which constitute functional assemblies which are combined in a relatively complex manner, the commissioning and maintenance of which are difficult to carry out and therefore too expensive. The invention therefore proposes a device for a spring-operated control mechanism of electrical power equipment, in particular medium or high voltage, in which at least one switching module is switched: from one position to another via of a latching-triggering arrangement including a main operating shaft on which are fixed control levers allowing this shaft to be driven in rotation by drive means in a first determined direction, from a first position for which the module is in a first state up to a second position in which the module is brought into a second state, and against a return spring capable of rotating the main shaft in the opposite direction to bring the module from the second state to first state. The arrangement further includes a limit switch acting upon the return of the shaft in

  first position under the action of the return spring.

  According to a characteristic of the invention, the device consists of a return and damping sub-assembly which includes a damper and a return spring coaxially mounted between two articulation pivots, one of which is fixed and the another is fixed at the end of one of the levers carried by the main shaft. The shock absorber tank is articulated on a first of the pivots and the piston rod of this shock absorber is articulated on the second of the pivots. The spring is integral with the shock absorber tank by a first end and the articulation end

  of the piston rod by a second end.

  The invention also provides a control mechanism for electrical power equipment, in particular medium or high voltage, in which at least one switching module is switched from one position to another by means of a latch-trip arrangement including an operating shaft on which are fixed control levers allowing this shaft to be driven in rotation, in a first direction determined under the action of a rotary cam pressing on one of the levers, said to be interlocking-tripping , said rotation being carried out from a first position for which the module is in a first state to a second position in which the module is brought into a second state, and against a return spring capable of making turn the main shaft in the opposite direction to bring the module from the second state to the first state. The rotation in the opposite direction is not possible after erasing a retaining pawl which retains this shaft in its second position by acting on the interlock-release lever, under the control of release means, when the cam has become inoperative. because of its rotation and its profile. The arrangement also includes a limit switch acting when the shaft returns to the first position

under the action of the return spring.

  According to a characteristic of the invention, said mechanism comprises a latching-triggering arrangement o a lever, fixed on the main shaft, carries an end pivot at the level of which is articulated a device constituted by a return sub-assembly and damping, including a damper and a return spring coaxially mounted between two articulation pivots, one of which is fixed and the other of which is said end pivot. The shock absorber tank is articulated on a first of the

  pivots and the piston rod of this shock absorber is articulated on the second.

  The return spring is secured to the shock absorber tank by a first end and to the articulation end of the piston rod by

a second end.

  The invention, its characteristics and its advantages are specified in the

  description which follows in conjunction with the figures mentioned below.

  Figure 1 shows a diagram of a latching arrangement

  trigger that includes a known control mechanism

  of electrical power equipment.

  Figure 2 shows a diagram of a latching arrangement

  trip device comprising a control mechanism similar to that

  mentioned above which is equipped with a device according to the invention.

  Figure 3 shows a section of a device consisting of a sub-

  recall and amortization assembly according to the invention.

  The known spring control mechanism, one of the main arrangements of which is shown diagrammatically in FIG. 1, corresponds to that which is described in conjunction with FIG. 1 of European application 651409. It is intended to equip electrical equipment with power and in particular a medium or high voltage circuit breaker, comprising a power switching module 1 provided with a latching-tripping arrangement which more particularly ensures switching on and off. For this purpose, this arrangement has means, shown diagrammatically by a mechanical control link L, enabling it to act on the switching module 1, symbolized by a contact which is shown in the open position in FIG. 1 and in the closed position on the

figure 2.

  The control link L is articulated on a lever 2 laterally carried by a main operating shaft 3- rotating in a limited way, either in one direction to allow the passage of a first position or starting position, for which the module switching 1 is in a first state, at a second position, for which this module is brought into a second state, ie in the other direction for a transition from the second position to the first. Generally the first position results in a triggered state of the module, while the second position

corresponds to an engaged state.

  The main shaft 3 is rotated in a determined direction, from its first position and here counterclockwise, by the action of an engagement cam 4 fixed on a shaft 5 whose rotation is provided by drive means, known to those skilled in the art. These means are described in particular in European application 651409 and they are not detailed here insofar as they

  have only an indirect relationship with the subject of the invention.

  Cam 4 has a profile, through which it comes

  press against a roller 6 carried by a latching lever-

  trigger 7, itself fixed laterally on the main shaft 3, so as to rotate this main shaft, from its first position, to its second position for which the switching module 1 is engaged. The profile of the cam 4 is also produced so as to no longer cooperate with the roller 6 to drive the shaft 3, from the moment it has made it possible to reach the second position and as long as, on the one hand, the rotation of the cam did not allow it to return to a first determined starting position and that, on the other hand, the lever 7 is not

  himself returned to a first determined starting position.

  The engagement-trigger lever 7 carries a finger 8 allowing it to cooperate with a roller 9 carried by a retaining pawl, so as to prevent the main shaft 3 from turning clockwise, under the action of a return spring 11. This spring is connected to one end of a lever 20 laterally fixed on the main shaft 3 and it is bandaged during the rotation of the shaft 3 under the action of the cam 4. The retaining pawl 10 is a lever articulated on an axis 12. It is held in the position for which it prevents the main shaft from rotating, by means of a trigger cam 13 against which it is then in stop. The cam 13 is articulated on an axis 14 and controlled by trigger means 15, known to the skilled person and represented in symbolized form in FIGS. 1 and 2. These known means make it possible to control, automatically and / or manually, the rotation of the cam 13 to allow it to pass from a position for which the pawl 10 blocks the rotation of the main shaft 3, under the effect of the spring 11, by immobilization of the finger 8, to a position for which the ratchet is erased by rotation and releases the finger, this rotation being here provided

  clockwise.

  The rotation of the main shaft 3 under the tensile action of the spring 11 is enabled by the release of the finger 8. It acts on the switching module 1 which leaves the engaged position, where it was held, to return first position. This rotation is braked at the end of the stroke by means of a damper 16, which is articulated on a fixed axis 17 and whose piston 18 comes to articulate at the end of a lever.

  19 laterally fixed on the main shaft 3.

  According to the invention, it is planned to replace this sophisticated control mechanism with an efficient and reliable mechanism which is less complex and less bulky, as illustrated in FIGS. 2 and 3. This relates more particularly to functional sub-assemblies whose

  essential elements are the return spring 11 and the damper 16.

  Thus, in the known embodiment succinctly described above, the damper and the spring each occupy a relatively large volume: t in the mechanism and the means for connecting the spring and the damper to the main shaft are mechanically quite complex and imply the presence of specific means of adjustment which have not

  been developed here. For example, in the known mechanism mentioned above

  above, the return spring 11 is fixed by a first end inside a container 21 from which comes out a chain 22 which is fixed, on the one hand, to the second end of the spring 11 and, on the other part, at the end of the lever 20. The container must include means accessible from the outside which make it possible to tension and adjust the tension of the spring. For the purpose of reducing overall dimensions, the chain 22 is folded back, which leads to it passing through idler pulleys 23, according to a relatively complicated path and in a manner which clearly deserves to be simplified. these drawbacks the invention therefore proposes an interlocking-tripping arrangement for a control mechanism, as shown diagrammatically in FIG. 2. This arrangement is intended to actuate a switching module 1 ′ which corresponds to the switching module 1 presented in FIG. 1 , and that it is possible to position either in a triggered position or in a position

engaged, like this module 1.

  Means, shown diagrammatically by a mechanical control link L ′ make it possible to act on the switching module 1 ′ symbolized by a contact shown in the closed position. The link L 'is articulated on a lever 2' laterally carried by a main shaft 3 'operating in the

  same conditions as the main tree 3.

  This main shaft 3 'is rotated from a first position or starting position, by the action of a latching cam 4' fixed on a shaft 5 'whose rotation is ensured by drive means such as 'mentioned above. The cam 4 ′, which corresponds to the cam 4, is designed to press against a roller 6 ′ carried by an interlock-trigger lever 7 ′ laterally fixed on the main shaft 3 ′ so as to be able to rotate it from the first position, to a second position for which the module 1 'is in the engaged state. The profile of the cam 4 'is produced, like that of the cam 4, so that it no longer cooperates with the roller 6' to drive the shaft 3 ', from the moment this shaft has reached its second position and as long as the rotation did not allow the cam to return to the first position, as shown in Figure 2. As before, any renewal of this cooperation implies a prior return of the lever 7 'in position

of departure.

  The lever 7 'carries a finger 8' allowing it to cooperate with a roller 9 'carried by a retaining pawl 10', so as to prevent rotation of the main shaft clockwise, under the action of a return spring. The pawl 10 'is articulated on an axis 12' and it is held in a position, for which it prevents the shaft 3 'from rotating under the traction of the return spring, by means of a trigger cam 13' . This cam 13 'is controlled by trigger means 15', under the same conditions as the cam

  trigger 13 by the trigger means 15.

  On the other hand, according to the invention, it is planned to substitute a single mechanical device 35 for the functional sub-assemblies, the essential elements of which were the return spring 11 and the damper 16 in the latch-trip arrangement as described in connection

with figure 1.

  This mechanical device according to the invention is in the form of an autonomous sub-assembly in which a return spring 36 and a damper 37 are associated in a coaxial arrangement. This sub-assembly is provided in particular to allow independent adjustments of the pre-tension applied to the spring and of the damping at the level of the damper. The damper 37 is for example a conventional oil damper which is articulated by a first end on a fixed pivot 24, like the shock absorber 15 on the pivot 16. This shock absorber 37 comprises a piston rod 25, which projects from its second end and which is articulated on a lever 26 laterally fixed on the main shaft 3 '. This lever 26 replaces the

  levers 19 and 20 of the known embodiment, described above.

  In the proposed embodiment, the damper 37 comprises a tank 27, filled with oil, which is at least partially housed in a cylindrical body 28 where it is fixed and it is this body which has a passage

  29 provided to receive the articulation pivot 24.

  The return spring 36 is a helical spring which is fixed at one end to the body 28 which it comes to surround. In the envisaged exemplary embodiment, the body 28 comprises a peripheral groove of helical shape, the dimensions of which are complementary to that of the spring 36 which therefore comes to be subjected to it by a first end, as can be seen in FIGS. 2 and 3. The spring 36 is traversed over its length by the piston rod 25 and it is fixed by its second end to a bush 30 which also passes through the piston rod 25. In the proposed embodiment, the fixing of the spring 25 on the socket

  is made like that of this spring on the body 28.

  An adjustment sleeve 31 is screwed onto the end of the piston rod which projects from the tank 27 of the shock absorber 37 and which is threaded for this purpose. This sleeve is terminated at one end by a support collar 38 which is housed inside the helical spring, when the device is mounted, so as to serve as a stop for the sleeve 30. This arrangement makes it possible to adjust the stress imposed longitudinally at spring 36, by

  screwing or unscrewing the adjustment sleeve 31, it being understood that this spring is designed to exert traction on the lever 26.

  The end of the adjustment sleeve 31, which is opposite that by o penetrates the piston rod 25, is articulated at the end of the lever 26 so that the device 35 according to the invention can pivot following the movement of this end, when the main shaft 3 'is operated. In the proposed embodiment, a yoke 32 receives the threaded end of the piston rod 25. The yoke 32 has an axis passage 33 provided to allow it to come to articulate on a

  end pivot 34 carried by the lever 26.

  The spring 36 of the return and damping device thus formed is therefore elastically stretched, when the main shaft 3 'is rotated under the action of the cam 4' acting by pressing on the lever 7 ',

  when this cam is rotated by its drive means.

  Maximum stretching of the spring 36 is obtained when the cam 4 'has

  driven the switching module 1 'in the engaged position.

  Simultaneously the piston rod 25 of the shock absorber is brought into its

  maximum projection position, outside of the tank 27 of the shock absorber.

  The positioning of the sleeve 31 on the piston rod is adjusted by screwing or unscrewing, it makes it possible to adjust the return force exerted by the spring 36 on the main shaft 3 'via the lever 26. This force ensures the return of the main shaft in its first position, for which the switch 1 'is triggered, as soon as the cam 13 is returned back due to operating conditions corresponding to the predetermined trigger conditions. The damper 37 comes into action when the main shaft returns to the first position, under the action of the spring 36 and it provides braking to avoid

  the appearance of oscillations at the end of the race.

Claims (6)

  1 / Device for a spring-operated control mechanism of electrical power equipment, in particular medium or high voltage, in which at least one switching module (1 ') is switched from one position to another by means of a trigger-trigger arrangement including a main operating shaft (3 ') on which are fixed control levers allowing this shaft to be driven in rotation under the action of a cam (4') in a first determined direction , from a first position for which the module is in a first state to a second position in which the module is brought into a second state, and against a return spring capable of rotating the main shaft in the opposite direction to bring the module from the second state to the first state, said engagement-trigger arrangement also comprising an end-of-travel damper acting when the shaft returns to the first position under the action of the rap spring pel, characterized in that said device consists of a return and damping sub-assembly which comprises a shock absorber (37) and a return spring (36) coaxially mounted between two articulation pivots, one of which (16 ') is fixed and the other (34) is fixed at the end of one of the levers (26) carried by the main shaft, in that the tank (27) of the shock absorber (37) is articulated on a first of the pivots and the piston rod (25) of this damper is articulated on the second of the pivots and in that the spring is integral with the tank of the damper by a first end and the articulation end of the piston rod by a second end.   2 / Device according to claim 1, wherein the piston rod is threaded at the end to receive a tension adjustment arrangement for the return spring which it passes through, so as to allow the position of this arrangement to be modified on a part of the length of   this rod and the prestress imposed on the spring.   3 / Device according to one of claims 1, 2, wherein is provided   an adjustment arrangement, of the stress applied to the return spring, which comprises an adjustment sleeve (31), screwed onto the piston rod and provided at one end with a support collar (38) which is housed at I interior of the spring, as well as a sleeve (30) for fixing the spring end threaded onto the sleeve and in abutment against the support collar under the spring tension.   4 / Device according to one of claims 1 to 3, wherein the rod   piston is articulated on a pivot (34) carried by a lever (26) fixed on the main shaft.   / Device according to one of claims 1 to 4, wherein the rod   piston (25) is articulated by a yoke (32) on a pivot (34) of a lever (26) laterally fixed on the main shaft, this yoke being fixed at the end   rod, beyond the return spring (36).   6 / Control mechanism for electrical power equipment, in particular medium or high voltage, in which at least one switching module (1 ′) is switched from one position to another by means of a latch-trip arrangement including an operating shaft (3 ') on which are fixed control levers allowing this shaft to be driven in rotation, in a first direction determined under the action of a rotary cam (4') pressing on one of the levers (7 '), said to be interlocking-tripping, said rotation being carried out from a first position for which the module is in a first state to a second position in which the module is brought into a second state, and to against a return spring capable of rotating the main shaft in the opposite direction to bring the module from the second state to the first state, said rotation in the opposite direction being possible after erasing a retaining pawl (10 ') who r holds this shaft in its second position by acting on the interlock-release lever (7 '), under the control of release means (5), when the cam has become inoperative due to its rotation and its profile, said arrangement further comprising an end-of-travel damper acting when the shaft returns to the first position under the action of the return spring, said mechanism being characterized in that said latch-release arrangement comprises a lever (26), fixed on the main shaft, which carries an end pivot (34) at the level of which is articulated a device constituted by a return and damping sub-assembly, including a shock absorber (37) and a return spring (36 ) coaxially mounted between two articulation pivots, one of which is fixed and the other of which is said end pivot (34), in that the tank (27) of the damper is articulated on a first of the pivots and the piston rod (25) of this shock absorber is rear ticulated on the second of these pivots and in that the return spring is integral with the l! l tank of the damper by a first end and the end   articulation of the piston rod by a second end.   7 / control mechanism according to claim 6, characterized in that   that it comprises a device according to at least one of the claims previous of device.