JPH09278410A - Ozone generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently generate ozone and to stably generate the ozone over a long period of time. SOLUTION: The outer peripheral surface of a cylindrical dielectric substance 4 is provided with a dielectric electrode 6 and the inside of this dielectric electrode 6 is provided with a brush-like electrode 5 radially projected out with many brush-like projections 5b from a core wire 5a. When voltage is impressed to the brush-like electrode 5, discharges arise densely between the front ends of the respective brush-like projections 5b and the dielectric electrode 6 in the discharge space between the outer peripheral part of the brush-like electrode 5 and the inner peripheral surface of the cylindrical dielectric 4, further, since the greater part of the gaseous raw materials flowing in the cylindrical dielectric substrate 4 flows in the cylindrical dielectric 4, the ozone generation occurs efficiently. The entire part of the brush-like electrode 5 is formed of the material having electrical conductivity and, therefore, even if the components forming the brush-like electrode 5 adhere to the other parts of the brush-like electrode 5 after sepn. as discharge products, these components do not disturb the discharge and the continuation of the stable discharge is made possible.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, silent discharge type ozone generators have been known as ozone generators.
It is disclosed in Japanese Patent Publication No. 8-107843. This ozone generator will be described with reference to FIG. A tube 1 made of a dielectric material such as glass is provided. Inside the tube 1, a coil electrode 2 formed by forming a spiral coil of nichrome wire or stainless wire is inserted, and the outer peripheral surface of the tube 1 is made of a conductive material. Material 3 has been applied. A high voltage power supply (not shown) is connected to the coil electrode 2.

In this ozone generator, a discharge gas in the tube 1 (inner circumference of the coil electrode 2 and the tube 1) is generated by flowing a raw material gas such as air into the tube 1 and applying a voltage to the coil electrode 2. A discharge is generated in the space between the surface) to generate ozone.

[0004]

[Problems to be Solved by the Invention]
In the ozone generator disclosed in Japanese Patent No. 107843, no discharge is generated in the portion between the coil pitches of the coil electrode 2, and dense discharge cannot be generated in the entire discharge space. Further, the coil electrode 2 has a risk of being cut by vibration during discharge.

Further, since the central portion of the coil electrode 2 is hollow, most of the raw material gas flowing in the tube 1 flows through this hollow portion, and the discharge effectively acts on the ozonization of the raw material gas. No, the efficiency of ozone generation is low.

Therefore, there has been proposed an ozone generator in which a glass rod of quartz or the like is inserted into the hollow portion of the coil electrode 2 shown in FIG. According to this ozone generator, most of the source gas is allowed to flow in the discharge space, and the efficiency of ozone generation is greatly improved. However, when such a glass rod is used, silicon oxide on the surface of the glass rod is sputtered at the time of discharge, and it firmly adheres to the coil electrode 2. Then, when a glass layer is formed on the surface of the coil electrode 2 due to long-time operation, discharge is less likely to occur, and the amount of ozone generated is reduced.

Therefore, an object of the present invention is to provide an ozone generator capable of efficiently and stably generating ozone.

[0008]

According to the first aspect of the present invention,
A tubular dielectric, a discharge electrode installed inside the tubular dielectric, and an induction electrode provided on the outer peripheral surface of the tubular dielectric are provided, and by applying a high voltage to the discharge electrode, In an ozone generator for generating ozone by discharging between a discharge electrode and the induction electrode, as the discharge electrode,
A brush-like electrode was used in which a large number of conductive brush-like projections were radially projected from a conductive core wire and the whole was made of a conductive material. Therefore, when a voltage is applied to the brush-shaped electrode, in the discharge space between the outer peripheral portion of the brush-shaped electrode and the inner peripheral surface of the cylindrical dielectric, discharge occurs between the tip end of each brush-shaped protrusion and the induction electrode. Happened closely, and moreover,
Most of the source gas flowing in the tubular dielectric flows in the discharge space, so that ozone is efficiently generated. Further, since the entire brush-like electrode is formed of a conductive material, the components forming the brush-like electrode due to discharge are separated as discharge products and then adhered to other parts of the brush-like electrode. Also, stable discharge can be continued without disturbing the discharge. The brush-shaped electrode provided with a large number of brush-shaped protrusions has a large surface area and thus has good thermal conductivity and can promote cooling of generated ozone.
It is possible to prevent the generated ozone from being thermally decomposed by heat generated during discharge.

According to a second aspect of the present invention, there is provided a tubular dielectric, a discharge electrode provided inside the tubular dielectric, and an induction electrode provided on an outer peripheral surface of the tubular dielectric. In an ozone generator for generating ozone by discharging between the discharge electrode and the induction electrode by applying a high voltage to the discharge electrode, as the discharge electrode, conductivity is provided on the outer periphery of the central shaft having conductivity. The spiral-shaped electrode having the spiral-shaped protrusions and having the entire structure made of a conductive material was used. Therefore, when a voltage is applied to the spiral electrode, in the discharge space between the spiral electrode and the inner peripheral surface of the cylindrical dielectric, discharge occurs between the outer peripheral portion of the spiral protrusion and the induction electrode, and Most of the source gas flowing in the tubular dielectric flows in the discharge space, so that ozone is efficiently generated. Further, since the entire spiral electrode is formed of a conductive material, the components forming the spiral electrode due to discharge are separated as discharge products and then adhered to other parts of the spiral electrode. Also, stable discharge can be continued without disturbing the discharge.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the invention described in claim 1 will be described with reference to FIG. A cylindrical dielectric 4 formed of glass, ceramics, or the like is provided, and a brush electrode 5 is installed inside the cylindrical dielectric 4. This brush-like electrode 5 is obtained by knitting a large number of brush-like projections 5b made of the same metal as the core wire 5a on a core wire 5a made of a conductive metal. Radially protruding with respect to.

An induction electrode 6 coated with a metal such as copper or aluminum is formed on the outer peripheral surface of the cylindrical dielectric 4. The brush-shaped electrode 5 and the induction electrode 6 are connected to a high-voltage power supply 7 that applies a high voltage to the brush-shaped electrode 5. In the cylindrical dielectric 4, a discharge space 8 is defined between the outer peripheral portion of the brush electrode 5 and the inner peripheral surface of the cylindrical dielectric 4.

In the above structure, when ozone is generated, the raw material gas is caused to flow from the one end side to the other end side inside the cylindrical dielectric 4, and at the same time, a high voltage is applied to the brush-like electrode 5. . When a high voltage is applied to the brush electrode 5,
In the discharge space 8, discharge occurs between the tip of the brush-like protrusion 5b and the induction electrode 6, and this discharge occurs densely for each brush-like protrusion 5b.

On the other hand, the brush-like electrode 5 has a large number of brush-like projections 5b radially projected from the core wire 5a. The density of the brush-like projections 5b becomes higher toward the central portion near the core wire 5a. . Therefore, most of the raw material gas flowing in the tubular dielectric 4 flows in the discharge space 8, and the discharge effectively acts on the ozonization of the raw material gas.
Owing to the dense discharge in the discharge space 8, the efficiency of ozone generation is increased.

When ozone is generated, the cylindrical dielectric 4 is discharged due to discharge.
The temperature inside rises. However, many brush-like protrusions 5b
Since the surface area of the brush-like electrode 5 provided with is large, the heat in the cylindrical dielectric 4 can be efficiently radiated to the outside, and the cooling of the ozone generated thereby can be promoted. It is possible to prevent ozone from being thermally decomposed by the heat of discharge and returned to oxygen.

Further, since the brush-like electrode 5 is entirely formed of the same metal having conductivity, after the metal component forming the brush-like electrode 5 is separated as a discharge product by discharge, it is separated. Even if it adheres to other parts of the brush-like electrode 5, it does not hinder the discharge, and therefore, stable discharge can be continued even after long-term use.

An ozone generation test was conducted using the brush-shaped electrode 5 and the conventional coil electrode 2 shown in FIG. 3 at a flow rate of the raw material gas of 0.5 liter / min. When the coil electrode 2 was used, the ozone generation amount was 0.9 g / h, and when the brush electrode 5 was used, the ozone generation amount was 1.51 g / h. When the brush electrode 5 was used, the coil electrode 2 was used. Compared to the case, the amount of ozone generated could be increased by about 70%.

In the present embodiment, the amount of ozone generated can be changed by changing the density and length of the brush-like protrusions 5b.

Next, an embodiment of the invention according to claim 2 will be described with reference to FIG. The same parts as those described in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, a spiral electrode 9 is used instead of the brush electrode 5. The spiral electrode 9 has a central shaft 9a and a spiral protrusion 9b located on the outer periphery of the central shaft 9a made of a conductive metal. The spiral electrode 9 and the induction electrode 6 are connected to a high voltage power source 7 that applies a high voltage to the spiral electrode 9. In the tubular dielectric 4,
A discharge space 10 is defined between the outer peripheral portion of the spiral electrode 9 and the inner peripheral surface of the tubular dielectric 4.

In such a structure, when ozone is generated, the raw material gas is caused to flow from the one end side to the other end side inside the cylindrical dielectric 4, and at the same time, a high voltage is applied to the spiral electrode 9. . When a high voltage is applied to the spiral electrode 9, the spiral protrusion 9 in the discharge space 10
A discharge occurs between the outer peripheral portion of b and the induction electrode 6. The spiral electrode 9 has a central shaft 9a at its central portion.
Therefore, most of the source gas flowing in the cylindrical dielectric 4 flows in the discharge space 10. Therefore,
The discharge effectively acts on the ozonization of the raw material gas, and the efficiency of ozone generation increases.

Further, since the entire spiral-shaped electrode 9 is formed of the same conductive metal, the metal component forming the spiral-shaped electrode 9 is separated as a discharge product by the discharge. Even if it later adheres to other parts of the spiral electrode 9, the discharge is not hindered, and therefore,
Stable discharge can be continued even after long-term use.

[0021]

According to the first aspect of the present invention, when a voltage is applied to the brush-like electrode, a discharge can be densely generated between each brush-like protrusion and the induction electrode in the discharge space. Moreover, most of the raw material gas flowing in the cylindrical dielectric can be made to flow into the discharge space, so that ozone can be efficiently generated, and the entire brush-like electrode is made of a conductive material. Therefore, even if the component forming the brush-like electrode is separated as a discharge product by the discharge and then adheres to other parts of the brush-like electrode, it is possible to continue the stable discharge without hindering the discharge. Can
Further, the brush-like electrode having a large number of brush-like protrusions has a large surface area and thus has good thermal conductivity, which promotes cooling of ozone and prevents ozone from being thermally decomposed by heat during discharge. .

According to the second aspect of the invention, when a voltage is applied to the spiral electrode, a discharge can be generated between the outer peripheral portion of the spiral protrusion and the induction electrode in the discharge space, and Most of the raw material gas flowing in the cylindrical dielectric can be made to flow into the discharge space, so that ozone can be efficiently generated, and the entire spiral electrode is made of a conductive material. Because
Even if the component forming the spiral electrode by the discharge is separated as a discharge product and then adheres to another portion of the spiral electrode, the stable discharge can be continued without disturbing the discharge.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of the invention according to claim 1;

FIG. 2 is a vertical sectional front view showing an embodiment of the invention according to claim 2;

FIG. 3 is a longitudinal sectional front view showing a conventional example.

[Explanation of symbols]

 4 Cylindrical Dielectric 5 Brush-shaped Electrode 5a Core Wire 5b Brush-shaped Protrusion 6 Induction Electrode 9 Spiral-shaped Electrode 9a Central Shaft 9b Spiral-shaped Protrusion

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Nakamura 1-1-1, Ishishiba, Matsumoto-shi, Nagano Ishikawajima Shibaura Machinery Co., Ltd. Matsumoto factory (72) Inventor Katsuji Yamamoto 3-chome, Toyoshu, Koto-ku, Tokyo No. 15 Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center (72) Inventor Masami Shimizu Ishikawajima Harima Heavy Industries Co., Ltd. Toji Technical Center (72) Inventor Takahashi Ryoji Ishikawajima Harima Heavy Industries Co., Ltd. Toni Technical Center, 1-1-15 Hoshu, Koto-ku, Tokyo

Claims (2)

[Claims] 1. A tubular dielectric, a discharge electrode installed inside the tubular dielectric, and an induction electrode provided on an outer peripheral surface of the tubular dielectric, and a high voltage is applied to the discharge electrode. In an ozone generator for generating ozone by discharging between the discharge electrode and the induction electrode by applying, as the discharge electrode, a large number of conductive brush-like projections are radially formed from a conductive core wire. An ozone generator characterized by using a brush-like electrode that is made to protrude and is entirely formed of a conductive material. 2. A cylindrical dielectric body, a discharge electrode installed inside the cylindrical dielectric body, and an induction electrode provided on the outer peripheral surface of the cylindrical dielectric body, and a high voltage is applied to the discharge electrode. In an ozone generator for generating ozone by discharging between the discharge electrode and the induction electrode by applying, a conductive spiral-shaped protrusion is provided on the outer periphery of a conductive central shaft as the discharge electrode. An ozone generator characterized in that a spiral electrode made entirely of a conductive material is used.