High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1994-05-25
1996-06-04
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218140, H01H 3366
Patent
active
055235360
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a multi-pole vacuum switch with, for each pole, a vacuum switching tube which has a linearly movable operating plunger, and with a pole operating unit which is assigned to each vacuum switching tube, the pole operating unit having a lever arrangement for changing the direction of the operating force provided by a drive device which is common to all poles, on the operating plunger, and a contact force spring which is arranged approximately parallel to the direction of movement of the operating plunger, as well as a casing which supports the lever arrangement and the contact force spring.
A vacuum switch of this kind has been disclosed in DE-A-34 14 016. The properties of the vacuum switch described there include the drive device being loaded by the contact forces of all the poles when the vacuum switching tubes are switched on. These forces are transmitted in a known manner by the lever arrangement via an insulating coupling rod to the drive device and must be supported there. The invention is based on the object of reducing the stressing of the drive device by the reaction of the contact forces. At the same time, displacement of the contact force springs is to be avoided overall during the switching-on and switching-off by means of a single-side secure support, such as is known per se (cf. DE-A-33 00 979).
This object is achieved according to the invention in that the lever arrangement comprises two toggle levers, one of which is connected in an articulated fashion to the operating plunger of the vacuum switching tube and the other of which is connected in an articulated fashion to a supporting lever which is pivotably mounted at one of its ends on the casing and which is connected at its other end to the contact force spring, the supporting lever assuming in its position of rest a position which extends approximately at right angles to the direction of movement of the operating plunger and the toggle levers being close to their extended position in the ON position of the vacuum switch.
By means of the specified arrangement of the toggle levers, it is ensured that the greater part of the reaction of the contact force springs in each pole is supported in the lever arrangement itself and in particular in the casing which receives the lever arrangement. The drive device of the vacuum switch and the parts which serve to transmit the operating force to the pole operating unit are thus largely relieved of mechanical loading. This load relief occurs irrespective of whether the toggle levers are in the pre-extended position or the overextended position. In the switching processes, the contact force spring is not moved as a whole but rather can be supported fixedly at one end since a connection to the supporting lever which is part of the lever arrangement is only required at the opposite end.
According to a further development of the invention, the toggle lever which is connected to the supporting lever can be extended beyond the toggle joint and the protruding lever part which is formed in this way can be constructed as a coupling point with an insulating coupling rod which connects the drive device to the pole operating unit. As a result, on the one hand the connection of the coupling rod to the pole operating unit is made easier because the toggle joint bolt has no further function to perform apart from connecting the toggle levers. On the other hand, by suitably selecting the length of the protruding lever part, it is possible to influence the transmission ratio of the lever arrangement.
The protruding lever part can have at least two through-openings, which are arranged at different distances from the end of the toggle lever which is connected to the supporting lever, for the optional insertion of a coupling bolt, by means of which the drive device is connected to the pole operating unit. In this way, the transmission ratio of the lever arrangement can be easily changed with the same movement of the drive device if, for example, a vacuum switching tube with a larger or smaller switchi
REFERENCES:
patent: 4713503 (1987-12-01), Kamp
patent: 5422450 (1995-06-01), Miyazawa et al.
Binder Manfred
Gruner Werner
Schmidt Detlev
Seebold Ralf
Steinemer Norbert
Friedhofer Michael A.
Scott J. R.
Siemens Aktiengesellschaft
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