Ozone generation apparatus

Patent metadata

Field	Value
Publication number	US-10759661-B2
Application number	US-201615136286-A
Country	US
Kind code	B2
Filing date	Apr 22, 2016
Priority date	Mar 16, 2012
Publication date	Sep 1, 2020
Grant date	Sep 1, 2020

Abstract

An ozone generation apparatus includes a cylindrical shaped first electrode, a cylindrical shaped second electrode disposed coaxially with the first electrode and disposed in the first electrode, a dielectric disposed between the first electrode and the second electrode. Dry air is supplied between the first electrode and the second electrode as raw material gas. A discharge gap length d formed by the first electrode, the second electrode, and the dielectric is set to be in a range of 0.3 to 0.5 mm. A pd product, which is a product of the discharge gap length d and a gas pressure p of the raw material gas, is in a range of 6 to 16 kPa·cm. And the discharge gap length d and the gas pressure p of the raw material gas are set to satisfy following expression.

First claim

The invention claimed is:

1. An ozone generation apparatus, comprising:
a cylindrical first metal electrode;
a cylindrical second metal electrode disposed coaxially with the cylindrical first metal electrode and disposed in the cylindrical first metal electrode;
a cylindrical dielectric member disposed between the cylindrical first metal electrode and the cylindrical second metal electrode; and
a power supply for applying a voltage between the cylindrical first metal electrode and the cylindrical second metal electrode, wherein
the cylindrical second metal electrode is provided on an inner circumference face of the cylindrical dielectric member,
a discharge gap length d between the cylindrical first metal electrode and the cylindrical dielectric member is set to be in a range of 0.3 to 0.5 mm,
the cylindrical first metal electrode includes a plurality of projections oriented toward an inside of the cylindrical first metal electrode, each projection is formed on an inner surface of the cylindrical first metal electrode from a material of the cylindrical first metal electrode, the cylindrical first metal electrode includes an indent formed on an opposite surface of the cylindrical first metal electrode opposite each respective projection, and
each projection of the plurality of projections is in contact with an outer circumference face of the cylindrical dielectric member, maintains the discharge gap length d, and has a height equivalent to the discharge gap length d, wherein an area at a tip of each projection is smaller than an area of a base of each projection,
dry air is supplied between the cylindrical first electrode and the cylindrical second electrode as raw material gas, a voltage is supplied between the cylindrical first electrode and the cylindrical second electrode from the power supply to generate discharge, and ozone is generated by the discharge,
a pd product, which is a product of the discharge gap length d and a gas pressure p of the raw material gas, is in a range of 6 to 16 kPa cm, and
the discharge gap length d and the gas pressure p of the raw material gas are set to satisfy expression
( pd− 250 d− 3.16) 2 +150 d ≤12.5.

2. The ozone generation apparatus according to claim 1 , wherein the cylindrical second metal electrode is formed on the inner circumference face of the cylindrical dielectric member by means of a sputtering method using a conductor as a target.

3. The ozone generation apparatus according to claim 2 , wherein the conductor is stainless steel.

4. The ozone generation apparatus according to claim 1 , wherein the cylindrical second metal electrode is formed by plating a conductor on the inner circumference face of the cylindrical dielectric member.

5. The ozone generation apparatus according to claim 4 , wherein the conductor is nickel.

Assignees

• Toshiba Kk

Inventors

• Murata Takaaki
• Okita Yuji
• Amemori Kiyoyuki
• Kubo Kie
• Makise Ryutaro
• Noda Kazuhiko
• Takahashi Ryoichi

Classifications

• C01B13/11 Primary

  by electric discharge · CPC title

• C01B2201/76

  Water · CPC title

• C01B2201/32

  Constructional details of the dielectrics · CPC title

• B01J2219/0809

  employing two or more electrodes · CPC title

• C01B2201/22

  Constructional details of the electrodes · CPC title