DE655480C - Compressed gas switch - Google Patents

Description

The invention relates to an innovation in a compressed gas switch with a stationary one and a movable switching contact, both of which serve as gas outlet channels and from the compressed gas in the opposite direction flow through from the arc chamber. In this known type of switch, the pipe contacts either hit with their end faces butt to one another, or else they are in contact with one another coming ends of the pipe contacts sharpened in the wall thickness like a cutting edge, and the wall thicknesses butt with the inclined surfaces on each other. These Kontaktverbindüngen are unsatisfactory because the contact surface of the two contacts is very small and the contact pressure can only be low, as soon as the force to generate the switch-on movement ceases. Accordingly is also the contact resistance of such a contact connection is great. Do you want but choose the far cheaper contact connection in which the tubes are pushed into one another be that the outer diameter of a pipe contact is equal to the inner diameter of the other pipe contact, the inconvenience arises that the two pipe contacts have different flow cross-sections exhibit. However, these unequal flow conditions for both contacts are disadvantageous for the extinguishing process.

This disadvantage is in a pressure gas switch with a fixed and a movable, both serving as gas outlet channels and from the pressurized gas in opposite directions Direction of flow through pipe contacts that penetrate one another when making contact, avoided by the fact that according to the invention the larger, the mating contact enclosing Pipe contact inside a movable, covering the contact surfaces, also carries tubular gas guide body, which when switched on by the smaller Pipe contact is displaced and the one released by the smaller contact inside the larger pipe contact when it is switched off Takes up space again automatically.

This structure of the switching contacts enables the flow conditions to make the same through both hollow contacts and the passage cross-section to be able to adapt the desired flow rate through the contacts regardless of the diameter of the same, without do without the reliable contact connection by sliding the pipe contacts into one another to have to.

*) The patent seeker indicated "as the inventor":

Cesare Cippitelli in Frankfurt, Main.

So that inside the larger pipe contact arranged gas guide body automatically occupy the space released by the smaller contact again when switched off can, he carries an annular piston that, loaded with pressurized gas, the insert body moves after the moving pole during switch-off. But it can also be Piston additionally with a compression spring or

ίο also by a compression spring alone for introduction be burdened with the movement.

In Figs. Ι and 2 an embodiment of the subject invention is shown. Fig. Ι shows the switch in a position during the switch-off process, while in Fig. 2 the switch is shown in the switched-on state. The fixed electrode b with the fixed contacts c, with which the movable contact d is in contact when switched on, is installed in an insulating housing α. In the tubular contacts there are gas guiding bodies e and /, of which e is fixedly connected to the contact d or made of one piece with it, while the hollow body / can slide in the contact c and in 'the electrode b. This sliding insert body f carries an annular piston g, the upper side of which is connected to the compressed air ring channel h and which can also be loaded with a compression spring. For good ventilation of the annular space below the piston g , ventilation holes are advantageously provided in the wall of the insert body. As has already been proposed, auxiliary pole pins i and k, to which the arc is transferred by the gas flow, are located in the center axis of the gas discharge channels.

If the switching contacts are separated, the contact d moves downwards, and the insert body f follows it, driven by compressed air, until the piston g has reached its stop. In this position, the pipe contact d has left the fixed contacts c and is about to separate from the current-conducting body /. An arc is created between the latter and the movable contact, which is driven reliably and quickly by the compressed air flowing in from the annular channel h to the auxiliary poles i and k , at which the quenching takes place. -

When switched on, the end face of the contact d hits that of the insert body /, moves it upwards and penetrates the fixed finger contacts c . Both when switching off and when switching on, the arc first takes hold of the front surface of the gas guide body e and / "before it is blown further into the pipe interior. In both cases, the friction surfaces of the actual contacts c and d remain clean and completely protected from erosion .

Claims (2)

Patent claims: 1. Compressed gas switch with one fixed and one movable, both serving as gas outlet channels and flowed through by the compressed gas in the opposite direction from the arc chamber , Pipe contacts which penetrate into one another when making contact, characterized in that the larger pipe contact enclosing the mating contact carries a movable, likewise tubular gas guide body (J) which covers the contact surfaces and which is displaced by the smaller pipe contact when switched on and when switched off automatically occupies the space released by the smaller contact inside the larger pipe contact. 2. Compressed gas switch according to claim 1, characterized in that the gas guide body (/) carries an annular piston (g) which, loaded with compressed gas, tracks the gas guide body during the switching-off process of the movable contact. 1 sheet of drawings