DE1080187B - Device for maintaining the operating condition of compressed air switches - Google Patents

Description

GERMAN

Devices for maintaining the operating state of compressed air switches are known which the compressed air generation system on a connecting line works, from the lines equipped with non-return valves to the compressed air tanks to lead. Post insulators, which in turn, are used to carry the compressed air forward, are attached to these carry the switching points. Due to the position of the check valves in the known switches, only achieves that the compressed air supplied by the compressed air generation system, all containers at the same time feeds, is not pushed into a sick container. What is not prevented here is that the compressed air escapes from the switching point via the post insulator and the defective compressed air tank.

But since the contact pieces of one or more switching points are affected by the compressed air in the On and / or off position are held, the switch interior is damaged in the event of damage to the outside closing component and thus an automatic entry through the escape of the compressed air or switching off the switching point. This is particularly disadvantageous when there are several post insulators are built on a common compressed air tank, because then the contents of the compressed air tank are emptied via the sick supporter, and all switching points are either switched on or off. In order to increase the operational safety of such switches, it has already been proposed that each post insulator be one Allocate a special compressed air tank to Pols with simultaneous use of blocking elements, which ensure that the compressed air can only escape from the damaged pole piece. The undamaged Switch parts remain in order and retain their switch position.

The invention shows a further solution for maintaining the operating state of a compressed air switch in the event of a fault. This is according to the invention Check valve inserted between the compressed air tank and the post insulator, as the Air responds in the post insulator and closes the outlet channel of the compressed air tank. In itself it is known Use safety valves that have an impermissible Prevent the discharge of compressed air, but the valves of known devices serve, as mentioned, not to close the outlet channel of the compressed air tank, but its inlet channel. Through this but the compressed air tank is put out of operation, which is avoided by the invention. This is special important when several post insulators are installed on the compressed air tank.

In order to achieve a reliable response of the shut-off valve, the valve disk of the shut-off valve is equipped with a Piston firmly connected to maintain the pressure in the compressed air device

the operating status

of compressed air switches

Applicant:

Continental electrical industry
Corporation '
Voigt & Haeffher,
Frankfurt / M., Hanauer Landstr. 142-172

Richard Schulz, Friedberg (Hess.),
has been named as the inventor

container is pressurized. The piston chamber of the shut-off valve, which receives a return spring, is located directly with the inside of the post insulator in connection. This connection is expediently made between Piston chamber and post insulator through a hole in the valve disk of the shut-off valve.

Is it a compressed air switch with an inserted between the compressed air tank and the post insulator Blow valve, which is the switching point when switching off and compressed air in the off position supplies, the shut-off valve, which reacts in the event of a pressure drop in the post insulator, controls the blow valve such that it closes the outlet channel of the compressed air tank. If the blow valve is controlled pneumatically, the valve disk of the shut-off valve blocks the access of the expensive air to the Piston of the blow valve and simultaneously vents the piston chamber of the blow valve, so that the spring-loaded The valve disk of the blow valve closes the compressed air outlet channel. If, on the other hand, the blow valve is mechanically controlled, in the event of a malfunction, this is done by the movement of the check valve plate from its control rods uncoupled and forced to reverse.

The pictures serve to explain the invention. Figure 1 shows an arrangement in which between the Compressed air tank 1 and the post insulator 2 on which the switching point is built and the one for forwarding the compressed air is used, a shut-off valve is inserted. In the housing 3 is a valve plate 4 with a sensor tube 5 protruding into the post insulator. The valve plate 4 stands with a Drive piston 6 in connection, in turn the

909 787/305

I 080187

The piston chamber 7 closes and on its rear side from the compressed air produced in the compressed air tank 1 is applied. If the compressed air suddenly escapes from the post insulator 2, the Sensor tube 5, the piston chamber 7 is also emptied. The resulting pressure difference at piston 6 has the consequence that the check valve is immediately moved upwards, in its end position the outlet of the Compressed air tank 1 closes towards the defective part of the switch. This is an emptying of the whole Compressed air tank and thus a spread of the disturbance to others on the same compressed air tank built-up post insulators and their switching points reliably prevented.

Figure 2 shows another possible application of the invention. Here is between the compressed air tank 1 and support insulator 2, a blow valve 8 is arranged. In the example shown, the position of the Blow valve in switch position »On«, d. That is, the interior of the post insulator 2 is above the outlet port 9 vented. To bring the switching points on the post insulator to the "Off" position, use the Control air line '10 supplied to the control valve 11 with compressed air. As a result, the blow valve 8 reverses, closes the outlet connection 9 and allows compressed air to flow from the boiler 1 into the post insulator 2. Is the Switch construction carried out so that, for example the switch contacts close the switch interior to the outside even after the switch-off process, then the blow valve 8 maintains its position, d. i.e., it exists as long as the switching contacts are in the "Off" position stand, a direct connection between the compressed air tank 1 and the post insulator 2. In the event of damage of the switching point space or post insulator would thus be the entire in the compressed air tank 1 accumulated compressed air flow out. However, this is prevented by reversing the blow valve 8 on the damaged switch part in such a malfunction and thus the outlet channel 16 of the compressed air tank 1 closes.

When the pressure drops sharply in the post insulator 2, the space 13 behind the second piston of the Check valve 11 is emptied via the monitoring line 14 so that the one on the other side of the piston Control air coming via channel 15 is effective, the shut-off valve reverses and closes the control air line 10 and empties the space 12 behind the piston of the blow valve 8 into the open. The latter controls by the effect of the compressed air stored in the container 1 also to. This is the outlet to the damaged switch part and the control air line 10 closed. The pending control air holds over the Channel 15 the check valve 11 in the closed position.

If the control line is vented, the shut-off valve automatically returns to its starting position.

Claims (5)

Patent claims: 1. Device for maintaining the operating condition of compressed air switches where ■ the contact pieces are held in the on and / or off position by the compressed air and on the compressed air tank, one that serves to forward the compressed air and carries the switching point Post insulator is constructed by using one of the disturbed part of the remaining parts the shut-off valve of the compressed air system, characterized in that the shut-off valve between Compressed air tank and post insulator is inserted so that it is when the pressure drops Air responds in the post insulator and closes the outlet channel of the compressed air tank. 2. Compressed air switch according to claim 1, characterized in that the valve disk of the control valve (11) is firmly connected to a second piston, which on one side is affected by the pressure in the Compressed air tank is acted upon and its piston chamber on the other side, which has a return spring receives, is in direct contact with the interior of the post insulator (Fig. 2). 3. Compressed air switch according to claim 1 and 2 with one between the compressed air tank and post insulator Intermediate blow valve that the switching point when switching off and in the off position Compressed air supplies, characterized in that that when the pressure drops in the post insulator responsive shut-off valve (11) controls the blow valve so that it opens the outlet channel of the compressed air tank locks. 4. Compressed air switch according to claim 3 with pneumatic controlled blow valve, characterized in that the valve plate of the shut-off valve at its response blocks the access of the control air to the piston of the blow valve and at the same time the The piston chamber of the blow valve is vented so that the spring-loaded valve disk of the blow valve denotes the Compressed air outlet channel closes. 5. Compressed air switch according to claim 3 with a mechanically controlled blow valve, characterized in that that the blow valve in the event of a malfunction by the movement of the check valve plate of his Control linkage is uncoupled and forced to reverse. Considered publications:
German Auslegeschriften No. 1 002 440, 1 014 624. 1 sheet of drawings © 909 787/305 4.6Q