DE1055644B - Compressed air switch with a device for blocking the movable contact piece in the switch-off position when the operating pressure is removed - Google Patents

Description

GERMAN

The subject of patent 1 039 601 is a compressed air switch, the latter of which is arranged in a compressed air tank Switching point is at least in the switch-off position under operating pressure and its movable contact piece in the switch-on position by spring force and in the switch-off position by the operating pressure of the Pressurized gas is held. For blocking the movable contact piece in the switch-off position if there is no operating pressure to prevent switching on, a locking device is used, the one slidably arranged on the drive rod of the movable contact piece There is a piston with pin-like approaches, which by the operating pressure against a spring force in its Location is held. This arrangement can advantageously be used in compressed air switches with a high operating voltage with several switching paths connected in series per pole. The pressure in the pressurized gas container falls in the switched-off position of the contacts in a switching path, caused by major leakage z. B. as a result of external damage, the movable contact is recorded in the exhibition. The remaining Switching sections that are under pressure are still able to maintain the operating voltage. However, only a few, for example one or two switching paths per pole are required, as is the case with switching devices for 30 or 60 kV is the case, if a fault occurs, even if the moving Contact piece is blocked in its switched-off position, the switching paths due to the absence of the operating pressure unable to hold the applied voltage and a flashover will occur, leading to can cause sensitive disturbances.

An arrangement must therefore be made that the switching paths are in the switched-off position increase if the operating pressure is absent, as already proposed for compressed air switches became. While so far, however, the contact piece, which is stationary during normal switching, when the operating pressure is absent was moved in the sense of an enlargement of the switching distance, takes place with compressed air switches of the type characterized above, according to the invention, the enlargement of the switching path in the switch-off position if the operating pressure is absent due to an additional axial movement of the movable one Contact piece in the disconnection direction. The stroke of the locking piston with the pin-type is useful Approaches so enlarged that when there is no operating pressure in the switch-off position after concern the pin-like lugs on the locking disc this and thus also the drive rod the moving contact piece is moved in the sense of an increase in the switching distance.

The locking piston is advantageously designed

Compressed air switch with a device

to block the moving
Contact piece in the switch-off position
when there is no operating pressure

Addendum to patent 1,039,601

Applicant:
Voigt & Haeffner Aktiengesellschaft,
Frankfurt / M., Hanauer Landstr. 142-172

Herbert Worch _r Frankfurt / M.,
has been named as the inventor

formed that it is in its off position when the operating pressure is present as a stop for the Switching piston is used.

The pictures serve to explain the invention, namely in

Figure 1 shows the compressed air switch in the switch-off position when the operating pressure is present;

Figure 2 shows an intermediate position when the operating pressure and disappears

Figure 3 shows the final position of the movable contact piece with the enlarged switching path.

1 is the stationary contact piece, 2 the moving contact piece. Both are located in the compressed air tank 3 which is at high voltage potential and which is carried by the support 4 . The latter is also used to supply compressed air. The stationary contact 1 is attached to the insulator 5 and is thus isolated from the live housing 3. The drive rod 7 is connected to the piston 8 by the movable contact piece 2 and the consumable pin 6. The disk 9 is rotatably attached to the drive rod 7 and has bores (not shown) into which the pins 10 and 11 can penetrate when the switch is in the on position and the operating pressure remains off. Here, the spring 15 moves the piston 15 to the right, so that nothing changes in the switch position. The disk 9 has axial grooves on its outer circumference which enclose the guide strips 12 and 13 . These run helically and turn the disk 9 and thus the holes for the pins 10 and 11 when the switch is in the off position. Stay in this

909 507/426

Claims (3)

When the operating pressure is off, the spring 15 acting on the piston 14 can relax because it is stronger than the closing spring 16. The pins 10 and 11 press against the disk 9 and thus prevent a movement of the drive rod 7 with the contact piece 2 to the left. As can be seen from Fig. 2, the stroke of the piston 14 is selected so large that the pins 10 and 11 are in contact with the disk 9 before reaching its end position, and the disk 9 is in contact with the further movement of the piston 14 when the spring 15 is released is shifted to the right, so that, as Figure 3 shows, the contact distance X is increased. The increase in the contact distance is determined by the size of the stroke of the piston 14, which is selected according to the required contact distance. From Figure 1 it can also be seen that the piston 14 has such a shape that it "forms a stop for the piston 8 in the switched-off position. The mode of operation of the switch during normal switching on and off is the same as that of the switch in the main patent . Patent claims: 1. Compressed air switch with a device for blocking the moving contact piece in the switch-off position when there is no operating pressure due to a locking device, the one slidably arranged on the drive rod of the movable contact piece with pin-like lugs provided piston, which by the operating pressure against a Spring force is held in place, according to patent 1 039 601, with a device for enlarging the switching path in the switch-off position when there is no operating pressure, characterized in that that the increase in the switching distance in the switch-off position when there is no operating pressure by an additional axial movement of the movable contact piece in the disconnection direction he follows. 2. Compressed air switch according to claim 1, characterized in that the stroke of the piston (14), on which the force of the spring (15) acts, which is greater than the force of the closing spring (16), can be increased so that when the Operating pressure in the switch-off position after the pin-like lugs (10 and 11) are in contact with the disc (9), this and thus also the drive rod (7) with the movable contact piece (2) is moved in the sense of an increase in the switching distance. 3. Compressed air switch according to claim 1 and 2, characterized in that the piston (14) is designed so that it serves as a stop for the piston (8) in the off position when the operating pressure is present. 1 sheet of drawings © 909 507/426 4.59