JP3134342B2 - Ozone generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone generator.

[0002]

2. Description of the Related Art Some ozone generators for generating ozone from pure oxygen or a gas containing oxygen utilize a silent discharge. However, the ozone generation apparatus using the silent discharge has a drawback that the conversion efficiency from discharge energy to chemical reaction energy is low and the amount of generated ozone is inferior.

[0003] Therefore, there is an apparatus which attempts to generate ozone by corona discharge having higher energy conversion efficiency. This involves applying a pulsed high voltage to the corona discharge electrodes arranged opposite to each other, causing a corona discharge in the gap between these electrodes and causing a chemical reaction in the oxygen in the gas passing therethrough. To generate ozone.

[0004]

Conventionally, in order to generate a strong and stable corona discharge, an extremely short pulse voltage having a very short time width has been applied to the corona discharge electrode. However, when ozone is generated by applying such an extremely short pulse voltage, the amount of ozone can be increased as compared with that using silent discharge, but a sufficient amount of ozone has not yet been obtained.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an ozone generator capable of increasing the amount of generated ozone.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for generating a corona discharge between corona discharge electrodes disposed opposite to each other in an ozone generation reactor so that a pure water passing therethrough can be produced. In an ozone generator for generating ozone from oxygen or a gas containing oxygen, a first rotary spark gap switch is provided between the corona discharge electrodes.
Are connected in parallel, and the first rotary spark gap switch
A second rotary spark gap switch at both ends of the
A DC power supply is connected in series, and both rotary spark gaps
The switches are turned on and off alternately to allow the corona discharge
Is obtained so as to apply a square-wave pulse voltage of several tens ns~ several hundred ns to the machining gap.

[0007]

The amount of ozone generated can be increased by applying a square-wave pulse voltage between the corona discharge electrodes from a square-wave pulse voltage power supply.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a schematic configuration of an ozone generator according to the present invention. In the figure, reference numeral 10 denotes an ozone generation reactor that generates ozone from pure oxygen or an oxygen-containing gas (such as air), and reference numeral 11 denotes a square-wave pulse voltage power supply that repeatedly applies a square-wave pulse voltage to the ozone generation reactor 10.

As shown in FIG. 2, the ozone generation reactor 10 has a flow path 13 for pure oxygen or an oxygen-containing gas.
A pair of corona discharge electrodes extending along the flow path 13, that is, a discharge electrode 14 and an induction electrode 15 are disposed to face each other. In the figures, one of the electrodes 14 and 15 has a flat plate shape and the other has a knife edge shape, but both may have a knife edge shape. Both electrodes 14, 15
Are other coaxial cylindrical shapes (Fig. 3 (b)) and opposed flat plate shapes (Fig.
(a)), and the electrode 1 including the induction electrode described above.
What inserted the dielectric 16 between 4 and 15 may be sufficient.

On the other hand, a square-wave pulse voltage power supply 11 is connected between the discharge electrode 14 and the induction electrode 15 via a high-voltage cable 12, and a square-wave pulse voltage (rise time and rise time) is applied between the electrodes 14 and 15. Fall time + ns
~ Several hundred ns and a duty ratio of 1/10 to 9/10) repeatedly to generate a corona discharge in a gap between the electrodes 14 and 15.

FIG. 4 shows the details of the square-wave pulse voltage power supply 11.

Reference numeral 17 denotes a DC voltage source, and a lead 1 is connected to both ends thereof.
Output terminals 19, 19 are connected via 8, 18. The ozone generation reactor 10 described above is connected between these terminals 19, 19 to form a series circuit. A first switch 20 is connected in series and a second switch 21 is connected in parallel in a series circuit that connects the DC voltage source 17 and the ozone generation reactor 10. Here, a rotary spark gap switch is used for the first and second switches 20 and 21. These spark gap switches 20, 2
Numerals 1 rotate at the same number of revolutions so as to be in a conductive state in the same cycle as each other, and at a timing such that they are alternately in a conductive state (FIGS. 5A and 5B). .

When the switches 20 and 21 are driven to rotate, the first switch 20 is turned on, and a voltage is applied between the discharge electrode 14 and the induction electrode 15 in the ozone generation reactor 10. . At this time, the electrodes 14,
Since the power supply 11 is equivalent to a capacitive load for the power supply 11, a current flows between the two electrodes 14 and 15 when the applied voltage rises, and after the discharge occurs, charging is performed. Next, when the first switch 20 is turned off and the second switch 21 is turned on, the charge between the electrodes 14 and 15 is released through the switch 21 and the potential between the electrodes 14 and 15 is released. Is returned to the ground potential. At this time, a current flows contrary to the above, and discharge occurs.

Thus, by repeating this, a square wave pulse voltage as shown in FIG. 5C is applied between the discharge electrode 14 and the induction electrode 15, and when the square wave pulse voltage rises and falls. At times, corona discharge occurs as shown in FIG. 5 (d). Therefore, these electrodes 1
If an oxygen-containing gas such as air is flowed beforehand between the flow passages 4 and 15 (flow path 13), oxygen in the gas causes a chemical reaction by corona discharge to generate ozone.

As described above, in this embodiment, since the square-wave pulse voltage is repeatedly applied by the square-wave pulse voltage power supply 11, a strong corona discharge is generated to increase the amount of ozone generated. Can be. That is, since both the discharge and induction electrodes 14 and 15 are of the capacitive type as described above, in order to apply a very short pulse voltage as in the prior art, the power supply is replaced by a resistor instead of the switch 21 of FIG. When a very short pulse voltage is applied between the electrodes 14 and 15, most of the current flows through this resistor and is converted into heat energy, and the important electrode 1
The current flowing between 4 and 15 becomes small. Therefore, if a power supply structure in which a square-wave pulse voltage is applied by utilizing charge and discharge between the electrodes 14 and 15 as in this embodiment, the switches 20 and 21 are alternately used without using the above-described resistors. Corona discharge can be generated only by turning on and off, and electric energy can be efficiently converted to discharge energy to increase the amount of ozone generated.

[0017]

[0018]

In summary, according to the present invention, a square-wave pulse voltage is applied from a square-wave pulse voltage power supply between opposed corona discharge electrodes. Can be enhanced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an ozone generation device of the present invention.

FIG. 2 is a diagram illustrating an example of an ozone generation reactor used in the ozone generation device.

FIG. 3 is a diagram showing another example of the ozone generation reactor.

FIG. 4 is a diagram illustrating an example of a square-wave pulse voltage power supply used in the ozone generator.

FIG. 5 is a diagram showing an operation waveform by a square-wave pulse voltage power supply.

[Explanation of symbols]

 Reference Signs List 10 ozone generation reactor 11 square wave pulse voltage power supply 13 flow path 14 discharge electrode 15 induction electrode 16 dielectric

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-1-153504 (JP, A) JP-A-63-112402 (JP, A) JP-A-64-51303 (JP, A) JP-A-2- 267101 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) C01B 13/11

Claims (1)

(57) [Claims] An ozone generation apparatus for generating ozone from pure oxygen or a gas containing oxygen by generating corona discharge between corona discharge electrodes disposed opposite to each other in an ozone generation reactor. Between the corona discharge electrodes, the first rotary spark gap switch.
Switches in parallel, and the first rotary spark gap switch
Switches at both ends of the switch
And a DC power supply connected in series, and a double-sided spark gap
The corona discharge is performed by alternately turning on the switches.
An ozone generator characterized in that a square wave pulse voltage of several tens to several hundreds of ns is applied between the electrodes .