JPH03271103A - Ozonizer with creeping discharge - Google Patents

Abstract

PURPOSE:To provide the title ozonizer intended to reduce the numbers of conductors and lead wires, so designed that one or both of discharge and dielectric electrodes is (are) made of an electric resistor and a pair of terminals are provided, and then a heating electric source is connected to these terminals. CONSTITUTION:One surface of a dielectric plate 1 made of e.g. glass or ceramic is firmly fitted with a discharge electrode 2 and the other surface a dielectric electrode 3 made of an electric resistor, and these electrodes are connected, via lead wires 4a, 4b connected to a pair of terminals 3a, 3b, to a heating electric source 5. And the terminal 2a for the electrode 2 is connected, via a lead wire 6, to a high-voltage electric source 7 for discharge.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention applies a high voltage to a pair of electrodes that are brought into close contact with each other with a plate-shaped dielectric material sandwiched between them to cause creeping discharge, thereby discharging raw materials such as oxygen or air. The present invention relates to a creeping discharge ozonizer that generates ozone from gas, and particularly relates to an ozonizer that is provided with a heating element in order to prevent ozone generation efficiency from decreasing due to moisture contained in raw material gas or condensation thereof.

[Conventional technology]

There are ozonizers that obtain ozone through so-called silent discharge by interposing a dielectric material and an air layer between a pair of electrodes to which a high voltage is applied, and those that obtain ozone through a so-called silent discharge. There is a method in which ozone is obtained by creeping discharge by applying .

The latter creeping discharge type is known from Japanese Utility Model Application Publication No. 125485/1985 (Reference 1), in which the discharge electrode is linear in order to perform effective discharge and prevent wear due to discharge, and the dielectric electrode has a dielectric constant. Make it planar to raise it. In addition, Japanese Patent Application No. 1983-201030 (Reference 2) is known as a method in which the discharge electrode is made into a net shape to increase the effective discharge length, prevent wear of the electrode due to discharge, and obtain ozone with a low applied voltage. .

If the raw material gas contains moisture or condensation occurs on the ozonizer, the ozone generation efficiency will drop sharply, and if the raw material is air, harmful NOx will be generated. Therefore, an electric resistor (hereinafter referred to as There are several known inventions in which gas in the discharge area is dried by arranging heaters (also referred to as heaters) in parallel and applying a low voltage such as commercial voltage to generate heat.

To introduce some of the documents in which such a heater is installed in parallel with an ozonizer, first of all, in Japanese Patent Application Laid-Open No. 63-260802 (Reference 3), a dielectric electrode and a heater are installed in a dielectric body with a discharge electrode on the surface. This heater is located on the opposite side of the discharge electrode across the dielectric electrode. However, Document 3 does not mention the method of embedding the dielectric electrode and heater.

Next, in Japanese Utility Model Application Publication No. 18131/1983 (Reference 4), a discharge electrode and a heater are formed separately on the upper surface of a dielectric material by depositing tungsten powder at the bottom of the hole, and apart from this, a dielectric material of the same type is formed. A dielectric electrode is formed on the wafer in the same manner, and the ozonizer is obtained by welding the two together under heat and pressure. FIG. 2 of this document shows a circuit diagram in which one of the external circuits connected to a pair of terminals taken out from the heater is connected to a high voltage external circuit connected to the terminal of the discharge electrode.

Finally, in Japanese Unexamined Patent Publication No. 1-164702 (Reference 5), i! Example 1 is where a pole is provided and a heater is attached using printed wiring surrounding the discharge electrode on the same surface, and Example 2 is where the discharge electrode and the heater are buried in the dielectric at the same position in the thickness direction. It is shown. In neither case is the burial method indicated.

[Problem to be solved by the invention]

If we take a look at the conventional techniques mentioned above in which heaters are arranged side by side, all of them are left alone! The dielectric electrode is buried in a dielectric material in order to maintain insulation against high voltage between the pole and the mN electrode, and the embedding process is difficult. For example, it is known from Document 4 that another dielectric material is heat-press-bonded to a dielectric material having a dielectric electrode formed at the bottom of the surface thereof. Regarding heaters, there are two types of heaters: one in which the heater is embedded in the dielectric on the side of the dielectric electrode (Reference 3), and one in which the heater is embedded in the dielectric alongside the dielectric electrode (Example 2 in Reference 5). There are difficulties in forming and insulating the heater, and in the case where a heater is provided on the dielectric surface in parallel with the discharge electrode on the discharge electrode side (Example 1 of Reference 5), it is difficult to insulate the heater.

SUMMARY OF THE INVENTION An object of the present invention is to provide a creeping discharge ozonizer whose heater, ie, electric resistor, can be simplified.

[Means to solve the problem]

The creeping discharge ozonizer of the present invention includes: a discharge electrode provided in close contact with one surface of a plate-shaped dielectric; and a dielectric electrode opposed to the discharge electrode and provided in close contact with the other surface of the dielectric. In the creeping discharge ozonizer, at least one of the discharge electrode and the dielectric electrode is formed from an electric resistor, and a pair of terminals are provided, and a heating power source is connected to the terminal.

[Effect]

Since either the discharge electrode or the dielectric electrode is made of an electrical resistor and is integrated into a unit that also serves as a heating source, the number of parts and lead wires are reduced in this respect.

〔Example〕

FIG. 1 is a back view of the embodiment, showing an external electric circuit, and FIG. 2 is a front view of FIG. 1.

In the figure, a radiation pole 2 is located on one surface, the front, of a plate-shaped (including cylindrical surface) dielectric material 1 made of glass or ceramic.
On the other side, the back side, a pole 3 with a dielectric t1 is provided in close contact with it. This dielectric NN pole 3 is made of an electrical resistor, and terminals 3 at both ends
It is connected to a heating power source 5 through heater lead wires 4a and 4b connected to terminals a and 3b, and generates heat.

The terminal 2a of the discharge electrode 2 is connected to one pole of a high voltage power source 7 for discharge via a lead wire 6.

One of the heater lead wires, as shown in the figure, heater lead wire 4a is connected to the other pole of this high voltage power source.

In this way, the dielectric electrode 3 forms a pair with the discharge electrode 2 and has the role of one of the electrodes for discharge, and also serves as a heating element, so that even when the humidity of the raw material gas is high, the relative humidity around the discharge electrode 2 ozone generation by discharge is improved.

The electrode that also serves as a heating element may be a discharge electrode. Further, the discharge electrode and the dielectric electrode may also serve as a heating element, but in order to avoid short circuits caused by connection of a high-voltage power source, it is preferable to interpose an insulating transformer in the heating power source, for example.

As in Reference 2, the reticular number i! The voltage applied to the discharge can be lowered by using the t! The poles may be embedded in the dielectric or an insulating film may be adhered to the dielectric electrodes. However, the appeal of this embodiment is that instead of requiring three conductive materials as in the conventional case, it is sufficient to have one conductive material on each surface of the dielectric.
By increasing the width of the dielectric a little, insulation of the picture electrode can be ensured by the creepage distance, and if necessary, ribs may be provided on the edges of the dielectric.

〔Effect of the invention〕

The creeping discharge ozonizer of the present invention includes: a discharge electrode provided in close contact with one surface of a plate-shaped dielectric; and a dielectric electrode opposed to the discharge electrode and provided in close contact with the other surface of the dielectric. In the creeping discharge ozonizer, at least one of the discharge electrode and the dielectric electrode is formed from an electric resistor, and a pair of terminals are provided, and a heating power source is connected to this terminal, so that moisture in the raw material gas is reduced. As a countermeasure, when providing a heater, that is, an electric resistor, the electric resistor is also used as at least one of the electrodes, which has the effect of simplifying the structure by reducing the number of conductors and lead wires. Since there is only one conductor on each side of the dielectric, it has become practical to increase the width of the dielectric a little to ensure insulation by creepage distance, and it is now possible to bury dielectric electrodes and electrical resistors in the dielectric. This has the effect of eliminating the need for difficult manufacturing processes.

[Brief explanation of drawings]

FIG. 1 is a back view of the embodiment, showing an external electric circuit, and FIG. 2 is a front view of FIG. 1. 1... Dielectric, 2... Discharge electrode, 2a, 3a, 3b
...Terminal, 3...Dielectric electrode, 4a, 4b...Heater lead wire, 5...Heating power source.

Claims (1)

[Scope of Claims] 1) A discharge electrode provided in close contact with one surface of a plate-shaped dielectric, and a dielectric electrode opposed to this discharge electrode and provided in close contact with the other surface of the dielectric. A creeping discharge ozonizer characterized in that: at least one of the discharge electrode and the dielectric electrode is formed from an electric resistor, a pair of terminals are provided, and a heating power source is connected to the terminal.