Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific circuit breaker or control structure
Patent
1999-02-16
2000-03-21
Sherry, Michael J.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific circuit breaker or control structure
218 53, 218 54, H01H 7300
Patent
active
060409703
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an interrupter unit of a high-voltage circuit breaker that has at least two arcing contacts and one hollow cylindrical nozzle made of insulating material for blowing out an arc that may form between the arcing contacts and is fastened to a cylindrical component of the interrupter unit.
BACKGROUND OF THE INVENTION
A conventional interrupter unit is described, for example, in French Patent No. 2 491 675 A1. According to the design of the unit described there, a nozzle body made of insulating material is held in a metallic cylindrical component of the interrupter unit.
Under the influence of the hot switching gases, such a nozzle body made of insulating material may become deformed due to the effect of either high temperature or high gas pressure, and it may ultimately become detached from the fastening. The function of the circuit breaker is then no longer guaranteed, since without a properly operating nozzle the arc can no longer be blown out or reliably extinguished.
SUMMARY OF THE INVENTION
An object of the present invention is therefore to design an interrupter unit in which the nozzle made of insulating material is reliably fastened using the simplest possible means.
This object is achieved according to the present invention by the fact that the nozzle made of insulating material has an internal or external thread engaging with the cylindrical component, and a connection piece that can be fastened to the interrupter unit is provided, which supports the nozzle on its lateral surface opposite the thread and is provided with knurling on its side facing the nozzle made of insulating material to secure it against twisting.
Therefore, the connection piece according to the present invention has two functions. It supports the nozzle made of insulating material on the side opposite the thread, so that the nozzle made of insulating material cannot be removed from the thread even by high mechanical and thermal loads. The connection piece, through its knurling on its side facing the nozzle made of insulating material, also prevents the nozzle made of insulating material from twisting, thus preventing the nozzle from being unscrewed from the thread.
The design may feature an internal thread of the nozzle made of insulating material, screwed onto a component of the interrupter unit with the connection piece set onto the nozzle made of insulating material on the outside. The connection piece then has a knurling on its inside. An alternative embodiment of the present invention provides for the nozzle made of insulating material to have an external thread on its outer lateral surface, which is screwed into a cylindrical component of the interrupter unit and the connection piece to be inserted in the nozzle made of insulating material. The connection piece then has a knurling on its external lateral surface.
In both cases, the dimensions of the connection piece and the nozzle made of insulating material are matched to one another so that the knurling is pressed into the material of the nozzle when the connection piece is set onto or inserted into it.
The connection piece is then bonded to the interrupter unit and cannot be twisted.
In a further advantageous embodiment of the present invention the connection piece is connected to a flange, which is non-rotatably connected to the cylindrical component of the interrupter unit.
This flange can be connected to the cylindrical component of the interrupter unit via screws distributed on its periphery, for example.
The cylindrical component of the interrupter unit can, for example, be formed by the bottom of a compressed gas or hot gas chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 schematically shows a longitudinal section of an interrupter unit, FIG. 2 shows a lateral view of a connection piece with a flange.
DETAILED DESCRIPTION
The interrupter unit has two arcing contacts 1, 2, which coaxially oppose one another, and two continuous current contacts 12, 13, which concentrically surround the arcing contact
REFERENCES:
patent: 3855436 (1974-12-01), Marin
patent: 5902980 (1999-05-01), Reincke et al.
Gericke Joachim
Lehmann Volker
Sherry Michael J.
Siemens AG
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