JPH0589941A - Ozonizer - Google Patents

Abstract

PURPOSE:To enhance ozone generating efficiency of an ozonizer by utilizing surface corona discharge and decrease a necessary applied voltage. CONSTITUTION:A dielectric constituting an ozonizer by using surface corona discharge is made of an aluminum thin film 2 which is produced by applying anodic coating to an aluminum plate 1. Consequently, by the aluminum thin film 2 the dielectric is made to be a thin film so as to decrease an applied voltage, and further, a temperature of a substrate is reduced by a heat radiation effect of the aluminum plate of the base, thus enhancing ozone generating efficiency.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an ozone generator utilizing a surface corona discharge.

[0002]

2. Description of the Related Art Ozone has a strong oxidizing power and is effective in deodorizing, sterilizing, and decomposing organic substances. At present, it is used for purification of pools, cleaning of semiconductor chips, water treatment at water purification plants, sterilization of retort foods, etc., but it is expected to be applied to various fields in the future.

[0003]

Most of the ozone generators currently on the market generate ozone by a cylindrical silent discharge or a creeping corona discharge, and the silent discharge has a sturdy structure and long life. There are many, but a high voltage of 12 to 16 kV is required. The creeping corona discharge operates at a relatively low voltage of 2 to 10 kV, but has a short life due to wear of the discharge electrode.

Due to the above advantages and disadvantages, the silent discharge type is often used for large-sized devices, and the creeping corona discharge type is often used for small-sized devices. Further, in any of the above discharge devices, the ozone generation efficiency sharply decreases at high temperature and high humidity, so it is important to lower the temperature of the electrode part and the humidity of the raw material gas.

The present invention focuses on the cooling of the electrode part among the above problems, and an object thereof is to provide an ozone generator which solves this problem.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to an ozone generator for generating creeping corona discharge in a dielectric material to generate ozone. It is characterized by having done.

[0007]

According to the present invention, by forming alumite on the surface of an aluminum plate and generating ozone by creeping corona discharge, the cooling efficiency of the electrode part is high and the ozone operates in a small size with a low running cost. The generator can be configured to further expand the application field of ozone.

[0008]

1 is a perspective view of an ozone generator according to an embodiment of the present invention. In FIG. 1, 1 is an aluminum plate, 2 is an alumina thin film formed by alumite treatment, 3 is a mesh metal electrode, 4 is a lead wire, and 5 is a power source. The alumina thin film 2 has a thickness of 50 to 100 μm and is chemically sealed. As the mesh metal electrode 3, a silver paste is screen-printed in a mesh shape of 5 mm square, but nickel, platinum, titanium dioxide or the like can be used in addition to silver. Moreover, you may attach the net which knitted the wire instead of screen printing. A 30 μm thick silicon varnish thin film was formed on the net-like metal electrode 3 in the figure by dipping as a whole to improve the life and as a measure against humidity.

(Embodiment 1) Using the apparatus shown in FIG. 1, the input voltage is adjusted so that the output current becomes 10 mA.

[0010]

[Outer 1]

Was measured. The results are shown in Table 1.

[0012]

[Table 1]

(Second Embodiment) FIG. 2 is a perspective view showing the structure of the second embodiment. Reference numeral 1'denotes an aluminum plate in which a heat sink is formed of an aluminum plate, and the other structure is the same as that of FIG. Table 1 shows the results obtained by performing the same measurement as in Example 1 with this configuration.

Comparative Example 1 A discharge electrode similar to that of Example 1 (FIG. 1) was formed on an alumina plate having a thickness of 0.5 mm, and a silver paste as an induction electrode was baked on the entire surface of the alumina plate. Table 1 shows the results of the same measurement as in Example 1 using this apparatus.
Shown in.

"Ozone generation efficiency" in Table 1 is the ozone generation amount per power consumption.

As is apparent from Table 1, the present invention can significantly lower the substrate temperature as compared with the comparative example, and
Since the input voltage can be extremely lower than that of the comparative example by thinning the alumina coating as a dielectric, the amount of ozone generated per power consumption is dramatically increased.

[0017]

As described above, in the ozone generator of the present invention, the alumina coating formed on the aluminum plate is used as a dielectric, and ozone is generated by the creeping corona discharge generated by applying a dielectric voltage to the alumina coating. The heat dissipation effect of the electrode portion is enhanced and the substrate temperature can be kept low. In addition, the thinning of the alumina coating as the dielectric reduces the discharge start voltage, which has the effect of dramatically improving the ozone generation efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view of an ozone generator according to an embodiment of the present invention.

FIG. 2 is a perspective view of another embodiment of the present invention.

[Explanation of symbols]

1, 1 '... aluminum plate, 2 ... alumina thin film, 3 ... reticulated metal electrode, 4 ... lead wire, 5 ... power supply.

Claims (2)

[Claims] 1. An ozone generator for generating ozone by causing creeping corona discharge in a dielectric to generate ozone, characterized in that an alumina coating formed on an aluminum plate also serving as a heat dissipation plate is used as a dielectric electrode. vessel. 2. The ozone generator according to claim 1, wherein a reticulated metal or a metal oxide is used as a discharge electrode.