DE7344180U - Spring-loaded drive for electrical switchgear - Google Patents

Description

126/73 Wei / dh

BBC Aktiengesellschaft Brown, Boveri & Cie., Baden (Switzerland)

Spring-loaded drive for »electrical switchgear

The invention relates to a spring-loaded drive for electrical switching devices, in which a closing spring not only switches on but also tensioning the opening spring causes, the latter after being switched on regardless of the respective charged or discharged state of the Switch-on spring to switch off the switching device able.

The well-known spring-loaded drives for electrical switching devices, in particular for circuit breakers, are built in such a way that that the readiness for disconnection is given at any time if the circuit breaker is in the closed position ", so that his work z * B. in the event of a fault current is possible. The conception is made in such a way that the

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The switch-off spring is in the tensioned state and while ~ %

at the end of the switch-off process. So that switching on ι the switch can be commanded from a distance, for example, |

Si a switch-on spring is provided, which f tensioned by a power source, e.g. by an elevator motor §

has been, whereby the closing spring is dimensioned so, §

that they activate the opening spring at the same time | with tension. Such Peders memory drives bind relatively granular "

complicated in structure and require, in some cases, relatively highly stressed: mechanical elements.

The innovation has the task of creating a simple one
and cheap solution for a Peders memory drive of the type mentioned, in which the number of mechanically stressed elements is a minimum. According to the innovation
this is achieved in that the switch-on and switch-off spring
are each arranged between a fixed and a movable abutment, the abutment each as a piston
are formed and these are each arranged in hydraulic cylinders, and that the abutments with operating rods
are firmly connected, which have actuating tappets.

The drawing shows an embodiment of the invention.

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Show in detail

1 shows a mechanical-hydraulic spring-loaded drive for electrical switches with two controlled control valves in the hydraulic boom in basic position,

Fig. 2 to U three characteristic further positions.

In the figures, corresponding parts are provided with the same references. In FIG. 1, 1 is a hydraulic cylinder. In the latter, the piston-like movable abutment 2 for the closing spring 3 is slidably guided. The abutment 2 is arranged in the cylinder 1 in a quasi-tight and torsion-proof manner. It has a centrally arranged nut thread for receiving a self-locking threaded spindle la, which in turn is rotatably mounted in the bottom part of the cylinder 1. The spindle la carries the pawl lever Ib at the lower end, which cooperates with a holding pawl device 12 that can be actuated electromagnetically, for example. The space below the abutment 2 is denoted by 4 and the upper fixed abutment of the spring 3 is denoted by 13. In an analogous manner, the switch-on memory arrangement consisting of parts 1, la, Ib, 2, 3, 4, 12 and 13 is again present as switch-off memory arrangement 1 '... 13'. Here, the rod IU is only connected to part 2 ¹ , which, for example, acts as an actuator in a manner known per se

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switching device not shown is articulated. The abutment 2 is firmly connected to a member 15. The latter has a plunger 10 which can be displaced to the left against a restoring force. The member 15 is slidably mounted at 16 and has at its upper end a gate 10a through which an auxiliary switch 18 can be operated; In an analogous manner, the member 15 'mounted at 16' is connected to the abutment 2 'and carries the spring-loaded plunger 10'. In this case, no backdrop is required at the upper end of the link 15 '. The two hydraulic working spaces 4, H ¹ are connected to one another by the hydraulic linkage 5, 6, 5 ¹ with the interposition of the control valves 7, 7 ^{1 designed} as three-way valves. The valve 7 is connected through the line 5 to the chamber U, through the line 6 to the valve 7 'and through the line 6' to the hydraulic pressure-generating pump device 11. The valve 7 'is connected to the space 4' by means of the line 5 'and to the environment ^{via the connector 6 1'.} The suction port of the pump 11 is denoted by 6 '^1'. In this embodiment, at least the parts 1, 1 ', 7, 7' are surrounded by OeI. The control valve 7 has an actuating member 8 which is mounted at 17. In the area of the interaction with the plunger 10, part 8 is designed as a backdrop, likewise at its upper end 8a, where it cooperates with the auxiliary switch 19. In an analogous manner, the control valve 7 'has the actuator 9,

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which is stored at 17 'and in the area of the ram 10' is designed as a backdrop. Part 9 doesn't need any additional scenery at the top.

The new arrangement works as follows:

In the basic position shown in FIG. 1, the switch-on and switch-off springs 3, 3 'are relaxed. That on the pole 14 The connected switching device is in the switch-off position. The two auxiliary switches 18, 19 are closed. Sis are electrically connected in series and are in a circuit which is used to start the pump device 11 cares. As a result, pressure oil is conveyed via line 6 ', valve 7 and line 5 into space H below the abutment 2, which is thereby brought into the position according to FIG. In this position the closing spring 3 is tensioned, the ratchet lever Ib locked by means of the holding pawl device 12, the actuating member 8 and thus the control valve 7 in the lower The limit position is pushed and the auxiliary switches 18, 19 are brought into the open position, as a result of which the pump 11 is stopped. Now, starting from the position according to FIG. 2, the Spring-loaded drive for the purpose of switching on the switching device triggered. For this purpose, the latch, ebel Ib by means of an electrical impulse to the holding pawl mechanism 12 released, whereby the abutment 2 under the

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Effect of the spring 3 can move into the position shown in FIG. This causes the following: a) the OeI in room 4 becomes |>

pressurized and reaches over 5, 7, 6, 7 ', 5 in ¹ | "

Room 4 ', whereby the abutment 2' under simultaneous K,

I tensioning the switch-off spring 3 'in the position according to FIG

is brought, b) the valve 7 is in its upper and the valve 7 'is controlled in its lower limit position, c) the pawl lever Ib' is locked by means of the holding pawl device 12 ', d) the space 4' is via 5 ', 7 ', 6 ¹ ' connected to the environment and finally the auxiliary switches 18, 19 closed. As a result, the pump 11 starts to work. It promotes pressure oil into the space 4 and thereby brings the abutment 2 while tensioning the closing spring 3 in the position according to tig. 4, whereby the parts 7, 8, 10, 15, 18, 19 act exactly as in the position transition from FIG. 1 to FIG. In the position according to rig. 3, the opening spring 3 'could be discharged and the switching device switched off at any time, regardless of the position in which the abutment 2 of the spring 3 is, ie either at the beginning (Fig. 3), at the end (Fig. 4) or during the Clamping process. A possible disconnection is triggered in the same way as described above for the initiation of the activation. Here parts Ib 'and 12' work on the outside. However, if there is no switch-off release, the situation according to FIG. 4 arises

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both springs 3, 3 'are tensioned and the switching device is located in the "On" position. In this initial situation, the spring-loaded energy store can switch off-on-off, i.e. one carry out the so-called KU cycle.

A major advantage of the new arrangement is that that it only needs a hydraulic pressure condition during a short working phase. This means you need to Hydraulic elements do not have to meet high requirements in terms of tightness. For example, between sliding parts are allowed to have relatively high gap losses, which results in inexpensive manufacture.

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Claims (2)

• ♦ · - 8 '-' * · "5 126/73 DGbm S c h u t ζ a η s ρ r Ü c h e 1. Spring-loaded drive for electrical switchgear, in which a switch-on spring also causes the switch-off spring to be tensioned in addition to the switch-on, the latter being able to switch off the switchgear after the switch-on has been carried out, regardless of the respective charged or discharged state of the switch-on spring, characterized in that the switch-on (3) and the opening spring (3 ¹ ) are each arranged between a fixed (13 or 13 ') and a movable abutment (2 or 2'), the abutments (2, 2 ') being designed as pistons and these are each arranged in hydraulic cylinders (1, 1 '), and that the abutments (2, 2') are firmly connected to actuating rods (15, 15 ') which have actuating tappets (10, 10'). 2. Pedei's memory drive according to claim 1, characterized in that the piston holding the movable abutment (2) for the Closing spring (3) forms, has a gate (10a). BBC Public Company Brown, Boveri & Cie.