DE651169C - Fluid switch, in which a pump piston driven by the movable contact causes a fluid flow within a deletion chamber - Google Patents

Description

• ^ ciHGüm

In the case of a liquid switch, it is important - (during the disconnection process, let the pole clic In the vicinity of the arc, gases and vapors are created through skillful movement the liquid content of the switch must be removed as quickly as possible. This is done either by taking advantage of the im Inside the switching chamber in the vicinity of the arc pressure increase SeIl) St, in that as a result of the increasing speed of expansion during the outflow the pressurized gases from the switching chamber, the remaining liquid content is swirled through, or it will the increase in pressure due to the arc gases forming to actuate a pumping device used, which sets part of the liquid content in motion and feeds it to the arc. In the former! "All

so there is no orderly flow of liquid, which would be able to close the arc gap sufficiently thoroughly and quickly clean, in the second case the fluid flow created is not a steady one, in the same strength during the shutdown process, but the flow rate fluctuates with the changing arc energy.

It has also already been proposed to close the movable switching pole with a piston provided that a liquid flow to delete the during the shutdown process Arc generated. With this device, the piston remains during the entire formwork t process firmly connected to the switching spindle, so that the cylinder chamber a Must have a length that corresponds to the entire switching path. However, it is desirable in order to save on overall length, shorten the cylinder space so far that the piston can only cover a distance that corresponds to the switching path in a few half waves.

Furthermore, switches have become known in which a spring force actuated " Piston creates an extinguishing flow for the arc, the drive spring of the piston being driven by the movable pole during of the final shift process is charged. Such a pump piston moves from the start

j I'on den l'atenlsnelier has been given as the inventor »:

F. W. l'ape in Her / in.

(551169

the contact separation is completely free and independent of the moving contact. from a connection of the pump piston with the pole contact, the same speed of movement for both parts cannot be spoken.

In contrast, in the present invention, the pump piston from the beginning of the Pole separation up to arc extinction

ίο with the moving contact through a detachable Coupling are in communication to achieve that the piston and the pole contact move at the same speed, so with increased switching speed a more powerful flush is also ensured. After the deletion has taken place, a separation the coupling connection between the piston and the pole contact, so that the latter alone can continue its switch-off and leave the arcing chamber. the Separation of the releasable coupling from the spindle should be done in that for the Piston a stop is provided, which in turn by its the piston movement opposite resistance makes a decoupling. Once the decoupling has taken place, the piston is compressed by a helical spring, which during the opening movement was removed again from its stop and in its initial position returned, releasing the lock for the clutch.

During the switch-on process, the one provided with a bevel on its face penetrates Pole pin into the piston coupling and displaces the coupling pins until they move into Jump into the recesses of the potentiometer. The coupling of the piston with the moving one Pole part is done automatically by the pole part itself.

Of course, in addition to the acceleration work for the moving pole parts, the actuation device also has to expend the work for compressing and displacing the extinguishing liquid during the switch-off process. In order to reduce this additional work, the displacement piston forcibly guided by the pole pin is to receive an additional pressure surface, which is loaded on the one hand by the pressure of the peeling chamber and on the other hand by the pressure in the discharge chamber, so that a force supporting this movement during the disconnection process takes effect. Two exemplary embodiments are shown schematically in the figures. In Fig. Ι the piston £ is releasably coupled to the switching spindle c. The piston carries iii this embodiment, a number on the 'Kreisiläche of the piston arranged distributed Kupplungsbolzeu / imported c by springs in recesses in the spindle and held there. The coupling bolts are at the outer end with a bracket ;; Mistake.

With pole separation, the piston g is moved downwards with the sound speed of the spindle c. The displaced liquid shoots through the annular gap 0 and through the hollow pole pin to the arc and to the contact poles. At the moment when the stirrups ;; When the coupling bolt / stop pins reach ρ , the piston g is uncoupled by the pins /> penetrating the recess of the bolts / and pulling the latter out of the recesses in the switching pole c. The spindle c can continue the switch-off path on its own, while the piston is snapped back into its initial position by the tension of the spring q. As soon as the stop η leaves the stop pin ρ , the coupling bolts are also returned to their switched-on position by the springs m.

During the switch-on process, the sharpened head of the pole spindle c penetrates the gap between the coupling bolts / and pushes them to the side. When the spindle c has reached its final switch-on position, the bolts / jump into the recesses of the spindles, whereby the coupling state between the piston and the spindle is automatically restored.

In Fig. 2 the piston g , which is connected to the spindle, is provided with an additional pressure wall / ■ which is loaded on the one hand by the pressure of the switching chamber and on the other hand by the pressure in the outflow space.

If the switching poles are separated from each other and the moving pole is moved downwards with the displacement piston, the process below the piston g remains the same as in Fig. 1.The arc gases that form are created in the switching chamber and thus above the additional piston surface r a Pressure increase, since the connection openings .v of the switching chamber with the outflow space act as throttle cross-sections, and can optionally also be closed by spring-loaded overflow valves. The pressure of the outflow space prevails below the annular piston surface r , since the liquid can escape through the openings t in the cylinder wall and through the pipe connection u to the outflow space e. Due to the additional force acting on the piston area , caused by the pressure difference above and below this area, the drive device for the indexing spindle

05t

relieved during the shutdown process and the shutdown process accelerated accordingly.

Claims (5)

Patent claims: i. Liquid switch, in which one driven by the movable contact Pump piston causes a flow of liquid within an extinguishing chamber, ίο from the pressure side to the suction side of the Piston passes the arc tightly enclosing, characterized in that the Pump piston for a period of a few half-waves after pole separation with the moving contact by a detachable one Coupling is connected, so that the 'piston inevitably with the contact from the beginning of the pole separation' The same speed follows, whereupon the coupling connection is disconnected is carried out between the piston and the pole contact and the latter alone continues its path and the arcing chamber leaves. 2. Liquid switch according to claim j, characterized in that the separation of the releasable coupling between the pump piston and movable contact is effected by a fixed stop for the piston (g) . 3. Liquid switch according to claim 1; md 2, characterized in that according to Separation of the clutch, the piston removed again from its stop by accumulated opposing forces and as a result of this Movement the lock for the clutch is released again. 4. Liquid switch according to claim 1 to 3, characterized in that when The coupling of the piston with the movable pole pin is automatically switched on he follows. 5. Liquid switch according to claim 1 to 4, characterized in that the Verdrängungskoiben has an additional pressure surface (r) which is loaded on the one hand by the pressure of the switching chamber and on the other hand by the pressure in the Äusströmraum, so that an additional force on the Piston in the direction of the disengaging pole pin arises. 1 sheet of drawings