JP2016033881A - Electrode feeding apparatus for in-liquid streamer discharge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such a problem that when continuous discharge in liquid is performed for a long period of time, a tip of a high-voltage electrode is worn away, a gap between electrodes is separated, generation of discharge is deteriorated, and finally streamer discharge is stopped, so that it is necessary to stably generate in-liquid streamer discharge for a long period of time without interrupting it on the way.SOLUTION: An electrode feeding apparatus for in-liquid streamer discharge feeds only necessary quantity of a worn electrode while measuring a generation rate of in-liquid streamer discharge so that the generation rate of the streamer discharge becomes a restoration set value or more, so that a gap between two appropriate poles can be held and stable in-liquid streamer discharge can be generated over a long period of time.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electrode feeding device for generating a stable submerged streamer discharge for a long time for application in pulse power technology.

For pulse power technology applications, discharge from the high voltage electrode placed in the liquid to the ground electrode is generated from the pulse power generator that repeatedly generates large power with a short pulse width, generating streamer discharge in liquid However, in order to apply the technology, it is necessary to be able to discharge continuously and stably over a long period of time without interrupting the streamer discharge in the liquid.

When the high-voltage electrode placed in the liquid is discharged for a long time, the electrode tip wears out so that the proper inter-electrode gap cannot be maintained and the discharge stops, so that the electrode feeding device can restore and maintain the inter-electrode gap. Development was required.

Japanese Patent No. 3949454 Japanese Patent No. 4391863 Patent No. 4,489,490

For pulse power technology application, it is necessary to generate a stable submerged streamer discharge for a long time without stopping the discharge. The gap cannot be maintained. If the gap between the two electrodes becomes far, submerged streamer discharge will not occur, and if it is too close, submerged spark discharge will occur.

Therefore, in order to generate the streamer discharge in the liquid in a stable state, it is necessary to restore and hold the gap between the two poles to an appropriate distance.

In addition, for the application of the pulse power technology, it is desirable that the work for restoring the gap between the two electrodes can be performed without interrupting the submerged streamer discharge.

Therefore, in order to restore the appropriate gap between the two electrodes when the streamer discharge occurrence rate falls below the set value while measuring the occurrence rate during submerged streamer discharge, a considerable amount of wear of the high-voltage electrode is used. By sending out over a long time, the problem of applying pulse power technology is solved.

In the pulse power technology, the streamer discharge generated in the liquid generates an ultra-high electric field, ultraviolet rays, shock waves, ozone, radicals, and the like, and therefore can be expected to be applied to new water environment technology.

Utilizing these phenomena, it can be applied to water purification such as the elimination of microorganisms in liquids and the decomposition of harmful organic compounds. There is a problem in that the gap changes, the discharge becomes worse, and the discharge stops at the end.

For this reason, it is necessary to replace the high voltage electrode to restore the interelectrode gap to the initial state, or to extrude the high voltage electrode to restore the interelectrode gap to the initial state.

The electrode feeder of the present invention controls the feed rate of the electrode with the occurrence rate of the submerged streamer discharge as the target value of the restoration setting, so that the submerged streamer discharge is continuously stabilized without stopping the submerged streamer discharge. Since the generation of electric discharge can be realized, the contribution to pulse power technology application is great.

It is the figure which showed the structure of the electrode feeder of the submerged streamer discharge which shows the form for implementing this invention. It is the figure which showed the example of the submerged streamer discharge incidence and the timing of electrode feed which show the form for implementing this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is the figure which showed schematic structure of the submerged streamer discharge generator in which the electrode automatic feed apparatus of the submerged streamer discharge which shows the form for implementing this invention is used.

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an electrode feeder for submerged streamer discharge according to the present invention.

This apparatus is connected to a pulse power source by an electrode cable (13) at the upper part of the apparatus, and a high voltage electrode (2) that serves as a submerged streamer discharge part projects from the lower end of the apparatus.

The rotation of the electrode delivery motor (3) in the outer casing (1) is transmitted to the spur gear (5) via the output-side pinion gear (4), and the outer periphery of the sparger is pinion gear and two idler gears (6). Is supported at three points, and can rotate stably.

On the other hand, a fine female screw (7) is cut inside the sparger, and the fine male screw (8) is meshed with the feed screw rod (9). The feed screw rod with the fine male screw cut can be moved by rotating the female screw, and the feed screw rod can be lowered and raised by forward and reverse rotation of the motor. The electrode (2) to be fed is fixed to the central portion of the feed screw rod (9) and moves together with the feed screw rod.

The feed screw rod is preliminarily threaded with a fine male screw having a length corresponding to the feed amount of the electrode, and slides along the guide groove inside the guide tube (10). By attaching a rotation stopper (11) to the motor, the rotation of the motor can be accurately converted into the amount of movement of the feed screw rod.

Further, the lower end of the electrode feed rod protrudes by a minute length as an electrode gap between two electrodes in which the electrode tip is set from the central portion of the insulating tube plug (12).

When continuous discharge in liquid is performed for a long time, the tip of the high-voltage electrode wears away, the gap between the electrodes becomes far away, the generation of discharge worsens, and the streamer discharge in liquid stops at the end. The electrode is fed out by an amount necessary for recovering the occurrence rate of the streamer discharge in liquid to the restoration set value or more, when the electrode is less than the restoration set value.

The electrode feed amount is controlled in association with the motor drive time. In addition, the setting of a minute electrode feed amount for restoring the gap between the electrodes can maintain stable generation of submerged streamer discharge for a long time without interrupting discharge by performing feedback control.

FIG. 1 shows the configuration of an electrode feeder for submerged streamer discharge. The upper tip of the device is connected to a pulse power source via an electrode cable (13), and the lower electrode tip of the device is opposed to the ground electrode so as to maintain an appropriate gap between two electrodes in the liquid.

FIG. 2 shows the streamer discharge rate in the liquid and the timing of electrode feed. If the electrode feed timing is set to the restoration set value when the streamer discharge occurrence rate becomes 80% or less, this time is the electrode feed timing, and the occurrence rate of the liquid streamer discharge is recovered to the restoration set value or more. Therefore, the electrode is fed out to restore the gap between the electrodes between the two electrodes.

FIG. 3 shows a schematic configuration diagram of the submerged streamer discharge generator. When streamer discharge occurs in the liquid, various high-density phenomena such as ultra-high electric field, ultraviolet rays, shock waves, and generation of radicals occur at the tip of the discharge. These high energy phenomena directly act on suspended matter in the liquid and can be used for water purification.

DESCRIPTION OF SYMBOLS 1 ... Outer cylinder container 2 ... Electrode 3 ... Motor 4 ... Pinion gear 5 ... Spur gear 6 ... Idler gear 7 ... Fine female screw 8 ... Fine male screw 9 ... Feed screw rod 10 ... guide tube 11 ... rotation stopper 12 ... insulating tube plug 13 ... electrode cable 14 ... container 15 ... liquid 16 ... pulse power power supply 17 ... high Voltage electrode 18 ... Earth electrode 19 ... Streamer discharge

Claims (5)

An electrode feed device for generating a streamer discharge in liquid for a long time between a high voltage electrode and a ground electrode placed in liquid from a pulse power generator that repeatedly generates large power with a short pulse width. In order to generate a submerged streamer discharge between the high-voltage electrode and the ground electrode placed in the liquid for a long time, it is necessary to maintain an appropriate interelectrode gap, and the electrode feed for maintaining the interelectrode gap is necessary. apparatus. When the high voltage electrode placed in the liquid is discharged for a long time, the tip of the electrode is worn and the appropriate gap between the electrodes cannot be maintained and the discharge stops. Electrode feeding device that can be used. Restores the streamer discharge rate in the liquid without stopping the discharge between the high-voltage electrode and the earth electrode placed in the liquid from the pulse power generator that repeatedly generates large power with a short pulse width As an electrode feed device, the electrode feed amount can be automatically controlled. The present invention is an in-liquid streamer discharge electrode feeding device that maintains an appropriate gap between electrodes in order to generate a long-time discharge between a high-voltage electrode and a ground electrode placed in the liquid. It is apparent that the same method can be used as an electrode feeder for medium spark discharge.