High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Vacuum
Patent
1994-09-27
1996-06-18
Scott, J. R.
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Vacuum
218121, 335195, H01H 3366, H01H 300, H01H 3342
Patent
active
055280099
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a vacuum switch including a vacuum interrupter having a displaceable connection bolt, and a drive device and a lever arrangement assigned to the vacuum interrupter, for connecting the common drive device to the vacuum interrupter. The lever arrangement has a two-armed drive lever which is connected in an articulated fashion to the displaceable connection bolt. On one side of the displaceable connection bolt the drive lever is connected to the drive device and interacts on the other side of the displaceable connection bolt with a fixed counter bearing, in addition with a contact spring and a current-loop assembly, formed from a flexible strip conductor, for obtaining a force which increases the contact force of the vacuum interrupter as a function of the current.
A vacuum switch slightly similar to that described above has been disclosed by German Patent Document No. DE-B-24 50 424. The vacuum switch described in this publication is a three pole protector in which the current-loop assembly serves, in the correctly switched on state, to increase the contact force as a function of current and to enlarge the opening force during switching off in order to break apart possible fusing of the switching elements. The current-loop assembly forms an independent assembly whose spatial requirement is approximately equal to the spatial requirement of the two-armed drive lever.
SUMMARY OF THE INVENTION
Taking the above vacuum switch as a point of departure, the present invention is based on substantially reducing the spatial requirement of the lever and current-loop assembly in order to facilitate the construction of compact switching devices.
This is achieved according to the present invention in that the fixed bearing is designed as a stop face against which the drive lever can be rested by the contact spring, the contact spring being designed as a tension spring and being arranged between an end part, which protrudes beyond the stop face, of the drive lever and a fixed counter bearing. One leg of the flexible strip conductor is connected to the displaceable connection bolt and is arranged to rest in a force-transmitting manner on the drive lever, including its end part, while the other leg of the strip conductor is supported in a fixed manner. In this way, it is ensured that the drive lever and the strip conductor form an associated assembly with correspondingly reduced spatial requirement. The contact spring acts at the same time as a switch-off spring during the release of its end connected to the drive device. The common use of a spring as a contact spring and as a switch off spring is known per se in vacuum switches from German Patent Document No. DE-A-34 14 016.
According to a further embodiment of the present invention, the drive lever can have two legs which receive the strip conductor between them and a central part which connects the legs and serves as a support face for supporting the leg, connected to the displaceable connection bolt, of the strip conductor. This design combines a high degree of rigidity of the drive lever with a good degree of protection of the strip conductor against lateral deformation.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is explained in greater detail below with reference to the exemplary embodiment illustrated in the figures.
FIG. 1 illustrates a diagrammatic, plan view of a multipole vacuum switch.
FIG. 2 illustrates a pole unit of the multipole vacuum switch according to FIG. 1 in the closed state.
FIG. 3 is a view of one of the narrow sides of the pole unit according to FIG. 2 in the closed state.
FIG. 4 illustrates one of the shell-like insulating elements from which the insulating arrangement of the pole unit according to FIG. 2 and FIG. 3 is composed.
FIG. 5 illustrates the insulating element according to FIG. 4 from above.
DETAILED DESCRIPTION
The vacuum switch 1 shown in FIG. 1 is of a three pole design and has three pole units 2 which are arranged one next to the other without spacing. T
REFERENCES:
patent: 3663906 (1972-05-01), Barkan et al.
patent: 3921109 (1975-11-01), Hodgson
patent: 4247745 (1981-01-01), Wilson
patent: 4591679 (1986-05-01), Yamat et al.
Marquardt Ulrich
Prietzel Gunter
Scott J. R.
Siemens Aktiengesellschaft
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