JPS5830242B2 - How to regenerate a discharge tube of an ozone generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in an "ozonizer", that is, an ozone generator, which generates ozone by silent discharge from an applied AC high voltage. The present invention relates to a method for regenerating discharge tubes with holes formed due to long-term use or material defects.

FIG. 1 shows a conventional ozone generator, in which 1 is a high-voltage cable, 2 is a raw material gas population 8, an ozone outlet 13, a cooling water population 11. A bushing 7 is provided at a predetermined position on a main body jacket 9 having a cooling water outlet 10, and 7 is a conductive film 4 made of aluminum, carbon, etc. formed on the inner surface.
A high-voltage electrode tube 6 made of a dielectric material such as heat-resistant glass, with the feeder 3 in contact with the electrode tube 6 and whose opening at one end is closed by a lid 5; and a flange portion of the lid 3b on the outside of the high-voltage electrode tube 6; This is a discharge tube formed by a low voltage electrode tube 12 that is concentrically arranged so as to form a discharge gap G with a garter spring 16.

Since the conventional ozone generator is configured as described above, the raw material gas consisting of air or oxygen supplied from the raw material gas port 8 is connected to the high voltage electrode to which AC high voltage is applied and silent discharge is performed. By flowing through the discharge gap G between the tube 6 and the low-voltage electrode tube 12, the oxygen molecules in the raw material gas are dissociated by electrons and the generated oxygen atoms combine with other oxygen molecules to become ozone. The ozone is extracted as ozone from the ozone outlet 10, but the discharge energy from such ozone generating means contributes only about 5% to ozone generation, and the remaining 95% becomes heat.
This heat is cooled by the cooling water supplied from the cooling water outlet 11, and a part of the heat is discharged from the cooling water outlet 10 to the outside of the main body together with the extracted ozone.

In the ozone generator described above, the discharge tube 7 is caused by deterioration due to long-term use of the conductive film 4 or the high voltage electrode tube 6.
Alternatively, due to partial defects in these materials, small circular holes 4a are formed in the conductive film 4 and the high voltage electrode tube 6, which communicate with each other, as shown in FIG.

6a may occur, resulting in a so-called "punk" condition.

When circular small holes 4a and 4b with the same inner diameter are generated in the discharge tube 7, silent discharge caused by the high voltage electrode tube 6 up until now is now caused by the conductive film 4 and the low voltage electrode tube 12. Arc discharge occurs between the two.

If such arc discharge continues, it will develop into a hole in the low voltage electrode tube 12, so to prevent this, a fuse is usually installed on the feeder 3 side to cut off the power supply to the discharge tube 7. The discharge tube had to be replaced each time the fuse blew due to a single puncture.

To deal with this, in order to regenerate and reuse the discharge tube 7 that had been replaced due to a single puncture accident, small holes that have occurred in the conductive film 4 of the discharge tube 7 or in the high voltage electrode tube 6 made of a dielectric. There is a method of filling the insulator with an insulator, but if it is simply closed, the interface between the original dielectric and the closed insulator will still be electrically and thermally weak, so it will not be able to withstand discharge. There is a drawback that it cannot be done.

This invention has been made with attention to this point, and one embodiment thereof will be described below.

That is, FIG. 3 shows a method for regenerating a discharge tube 7 according to the present invention, in which a puncture hole 6a that has occurred in a high voltage electrode tube 6 of a discharge tube is filled with an insulator 14 in order to repair it. , when the diameter of the head on the surface of the high voltage electrode tube 6 is a, the diameter of the small hole 4b of the conductive film 4 is increased, and the relationship between this and the diameter a of the head of the insulator 14 is calculated. may be set such that a≦b.

Another method is to use a high voltage electrode tube 6 made of a dielectric material.
When the small hole 6b is filled with the insulator 14 made of the same or similar material after partially melting, the diameter d of the small hole 4d of the conductive film 4 is made larger than the diameter C of the insulator 14. The relationship between C and the diameter C of the insulator 14 is such that C≦d.

According to the present invention, as described above, puncture holes 6a are formed in the high voltage electrode tube 6 and the conductive film 4 of the discharge tube 7.

4a occurs, the diameter of the small holes 4b and 4d of the conductive film 4 is made larger than the diameter of the insulator 14 filled in the high voltage electrode tube 6a, so that the conductive film 4 and the low voltage electrode tube 12 are separated. This has an excellent effect in that there is no possibility of arc discharge occurring between the tubes, and therefore there is no fear of holes forming in the low voltage electrode tube.

Note that when the discharge tube 7 regenerated by the method described above is operated, the temperature of the non-discharging part filled with the insulator 14 rises due to some heat conduction and convection due to ozone-containing air, but the temperature of the discharging part increases. Since the temperature is lower than that of the re-punctured part, the thermal effect on the re-punctured part is small, and the discharge in the un-punctured part of the discharge tube 7 continues as before the re-regeneration, so the regenerated discharge tube 7 can be fully used. Needless to say.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of the ozone generator, Figure 2 is an enlarged cross-sectional view of the high voltage electrode tube and the punctured hole in the conductive film, and Figure 3 is the regenerated perforated discharge tube according to the present invention. FIG. 4 is an enlarged sectional view showing another embodiment of the present invention. In the drawing, 4 is a conductive film, 6 is a high voltage electrode tube, 7 is a discharge tube,
12 is a low voltage electrode tube, 4a and 6a are puncture holes in the conductive film and high voltage electrode tube, 14 is an insulator, and 4b and 4d are puncture holes in the conductive film whose diameters have been increased by dropping them. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a discharge tube formed by a high voltage electrode tube made of a dielectric material with a conductive film formed on the inner surface, and a low voltage electrode tube corresponding to this high voltage electrode tube through a discharge gap,
A discharge tube regeneration method for an ozone generator, characterized in that the diameter of the corresponding puncture hole in the conductive film is made larger than the diameter of the insulator filled in the puncture hole generated in the high voltage electrode tube.