SU646511A1 - Device for initiating high-voltage discharge - Google Patents

Description

(54) DEVICE FOR INITIATING HIGH-VOLTAGE

DISCHARGE

The invention relates to electrical engineering and can be used in the processing of metals by pressure, particularly in the technology of pulsed sheet stamping. A known method of initiating a discharge with a jet of electrically conducting fluid creates a fluid bridge between the electrodes in the discharge chamber filled with another transmission medium l. In addition, a device for initiating a high voltage discharge 2 is known, comprising a discharge chamber, electrode systems with a hollow positive electrode, a pipeline connecting the hollow positive electrode with a capacitance filled with electroconductive fluid, a unit for creating high pressure, an electrically conductive fluid supply mechanism , including a knife-type solenoid valve, as well as a synchronization system for switching on high voltage at the moment of injection of a jet of electrically conductive fluid into the interelectrode gap. The known device does not ensure the continuity of the jet of electrically conductive fluid due to the special design of the electrode, which provides for the spraying of electrically conductive fluid throughout the chamber, as well as sufficient discharge stability. The aim of the invention is to increase the discharge stability, to simplify the automation of discharge initiation synchronous switching of high voltage at the moment of initiating a high voltage discharge. The goal is achieved by the fact that the node for creating high pressure is made in a pneumohydraulic cylinder. a nadporshnevian cavity of which is connected to the pneumatic network by means of electro-pneumatic valves, equipped with a non-return ball valve connecting the sub-fluted cavity to a container filled with electrically conductive

3

fluid, and a high pressure valve installed at the end connected to the pipeline.

The hollow positive electrode is supplied sequentially # 1m along its axis by a high pressure valve, a damper and a nozzle installed at the outlet.

In addition, the device is equipped with an electromagnetic relay connected to the sub-piston cavity of the pneumatic cylinder, and an electro-contact pressure gauge mounted at the end of the pneumo-hydraulic cylinder on the side of the over-piston cavity,

Fig. 1 is a schematic diagram of the proposed device; Fig 2 - a hollow electrode; FIG. 3, section A-A in FIG. 2

The device consists of a pneumohydro cylinder 1, connected by a ball check valve 2 with a capacity of 3, a locking valve KjJaHOM 4 and a high pressure valve 5 through a pipeline with a positive electrode 6 mounted into the housing of the discharge chamber 7 and containing a high pressure valve 8, a damper 9 and a nozzle ten.

The pneumohydraulic cylinder is connected to the pneumatic network 11 through electropneumatic valves (PEC) 12 and connected to an electrocontact pressure gauge (EKM) 13 and an electromagnetic relay f4.

The device works as follows

When a signal is sent from the control panel, the lower PEC provides compressed air supply from the pneumatic network P to the lower cavity of the pneumatic cylinder. There is an idle stroke - PORTION of electrically conducting fluid is sucked into the hydraulic cylinder. Then, the upper PEK switches on the compressed air supply to the upper cavity of the pneumocipindar. There is a gradual increase in air pressure, which is transmitted through the rod of the hydraulic cylinder to an electrically conductive fluid. The lower cavity of the pneumatic cylinder 1 communicates with the atmosphere. At the same time, air enters EKM. In time, when the pressure in the hydraulic system reaches its value, with EKM a signal is sent to the discharge, the high pressure valve 5 opens.

At the moment of applying the signal to the discharge, the electromagnetic relay 14 provides for ignition of the forging section of the high-voltage installation and are synchronous

1-4 injection under pressure of a jet of electrically conducting fluid into the interelectrode gap. At the same time, the flow of the electric fluid of the Shchey fluid passing through the high-pressure valve 8, the damper 9 and the nozzle 10 takes on the character of a laminar flow, ensuring chiva continuity of the jet.

This device allows to ensure the continuity of the jet of electrically conducting liquid and to increase the discharge stability. In addition, the use of the device simplifies the automation of the initiation of the high-voltage discharge.

Claims (3)

1. A device for initiating a high voltage discharge, containing a discharge chamber, an electrode system with a hollow positive electrode connected by a pipeline to a container filled with an electrically conductive fluid, a node for generating high pressure, characterized in that, to simplify the automation of discharge initiation, the node to create a high pressure, it is made in the form of a pneumohydraulic cylinder, the over-piston cavity of which is connected to the pneumatic network by means of electropneumatic valves, equipped with a reverse ball A new valve connects the bristle chamber with a container filled with electrically conductive fluid and a high pressure valve installed at the end connected to the pipeline. , 2. The device according to any one of the preceding paragraphs, in order to increase the stability of the discharge by ensuring the compactness of the electro-. With a water liquid, the hollow positive electrode is sequentially equipped with a high-pressure valve located on its axis, a damper and a nozzle installed at the outlet. 3. The device according to Clause I., which is indicated by the fact that, in order to synchronously turn on the high voltage at the moment of initiation of the high-voltage discharge, it is supplied; Hay electromagnetic relay, connected to the piston cavity of the pneumatic cylinder, and electromagnetic pressure gauge, mounted