JP2009242172A - Ozone generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ozone generating device which does not need a blower for supplying ozone to the outside, thereby prevents the generation of noise by the blower, by which the blower does not become dirty, a large quantity of ozone can be generated and the blowing quantity is large, and the generation of an arc discharge is prevented. <P>SOLUTION: An electrode pair is constituted by arranging a rear face side electrode on the rear side of the front surface side electrode with an insulator interposed therebetween so that the positions of the electrodes are shifted each other, a surface plasma generating device is used where the surface plasma is generated from the end edge of the surface electrode by applying an alternate current voltage to both electrodes. The surface plasma generating device is installed in a cylinder which leads an air flow induced by a plasma jet flow of the surface plasma, into the air flow flowing in the cylinder, ozone generated by contacting of the surface plasma and air is mixed and discharged from the cylinder. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ozone generator for generating ozone, and more particularly to an ozone generator that can continuously release ozone without a blower.

Ozone is an allotrope of oxygen, also called “activated oxygen”, whose chemical formula is O ₃ , which is formed by the action of ultraviolet light on oxygen. Ozone can be generated by silent discharge by connecting a high-pressure, high-frequency alternating current source between two electrodes and passing an oxygen-containing gas, for example air, between the electrodes, in which case air passes between the electrodes. As a result, some of the oxygen molecules are excited to produce ozone molecules.

  The generation of ozone using silent discharge has been widely known. Ozone is an effective disinfectant and deodorant, and ozone can kill bacteria by breaking down the bacterial molecular structure. Therefore, in places where there are unpleasant or harmful odors caused by harmful chemicals in the air or surface bacteria, the bacteria are killed and the molecular structure of the chemicals is degraded, resulting in disinfection and deodorization, resulting in low Even in concentration, ozone is an effective disinfectant. Since ozone is unstable, it decomposes to oxygen without any residue. Ozone can also be used to disinfect water by dissolving it in water.

  Taking advantage of these characteristics, more specifically, it has many uses such as sterilization of cooking surfaces in the kitchen, disinfection and deodorization of public toilets, and sterilization of swimming pools as a substitute for chlorine in the dissolved state. There are already commercially available devices that generate ozone for disinfection and deodorization.

  Various types of ozone generators that have been conventionally used exist, and an example is shown in FIG. The ozone generator shown in FIG. 4 is a standard discharge type ozonizer, in which one or both of the electrodes 51 and 52 are separated by a dielectric 55, and the distance between the electrodes is set to about 1 to 2 mm. When an alternating current of about 10 to 20 kV and 50 to several tens of kHz is applied from the power source 53 between the electrodes, a barrier discharge occurs. In this barrier discharge, since the electron temperature is high, oxygen molecules dissociate to generate oxygen atoms, and combine with other oxygen molecules to generate ozone. However, since ozone does not move as it is, the blower 56 is attached.

  As described above, the conventional ozone generator using a blower generates noise noise from the motor that drives the blower, and when used for a long time, dust adheres to the fan and the electrode. There is a problem that the discharge efficiency decreases.

  Therefore, for example, as shown in FIG. 5, an ozone generator that does not use a blower is proposed in Japanese Patent No. 3017146. That is, in the ozone generator shown in FIG. 4, the cylindrical electrode 61 made of a conductive alloy or the like and the needle electrode 62 made of a conductive metal or the like form a substantially cylindrical shape made of an insulating material such as plastic. It is attached to the electrode attachment member 63. The electrode mounting member 63 is provided with a cylindrical portion 63a that holds the cylindrical electrode 61, and an electrode support portion 63c that protrudes from the inner bottom surface or the inner back surface of the electrode mounting member 63. The electrode support portion 63c has a needle-like shape. By attaching the electrode 62, the needle electrode 62 is positioned adjacent to the outside of one opening 61a of the cylindrical electrode 61 and substantially at the center thereof. Reference numeral 64 denotes a high-voltage generator that generates a DC high voltage. The negative potential side lead wire is attached to the needle electrode 32, and the positive potential side lead wire is attached to the cylindrical electrode 31.

In the ozone generator having the above configuration, when a high DC voltage is applied between the cylindrical electrode 61 and the needle electrode 62, corona discharge occurs according to Coulomb's law, and ions and ozone are generated by the discharge energy at this time. Including wind is generated. This wind flows outward from the opening 61b of the cylindrical electrode 61, and diffuses ions and ozone generated in the cylindrical electrode 61 to the outside, so that ions can be released without a blower. Yes.
Japanese Patent No. 3017146

  As described above, the conventional ozone generator using a blower as shown in FIG. 2 generates noise noise due to the motor that drives the blower, and when it is used for a long time, dust adheres to the fan and the electrode. Therefore, there is a problem that the diffusion amount and the discharge efficiency are reduced. On the other hand, in the technique as shown in FIG. 4 for solving this problem, the corona discharge is caused by using the needle electrode and the cylindrical electrode, and ozone generation and air blowing are performed simultaneously. In this ozone generator, since the corona discharge does not use a dielectric, there is a problem that the corona discharge shifts to the arc discharge when a large current is supplied.

  That is, in the corona discharge between the needle electrode and the cylindrical electrode, the amount of ozone generated by the corona discharge is small, and the amount of airflow induced by the corona discharge is extremely small. For this reason, in order to generate a large amount of ozone at a practical level, it is necessary to pass a large current between the electrodes. In this case, the corona discharge shifts to the arc discharge. Therefore, when arc discharge occurs, noise is generated and the electrode is damaged. Therefore, it is difficult to put such an ozone generator into practical use.

  Therefore, the present invention does not require a blower for supplying ozone to the outside, thereby preventing noise from being generated by the blower, and preventing the blower from being contaminated with dust, etc. The main object is to provide an ozone generator that can generate a larger amount of ozone than the ozone generator to be used, has a large amount of blown air, and does not generate arc discharge.

  As shown in FIG. 1A, the surface plasma is generated by providing a surface side electrode 2 and a back side electrode 3 with an insulator 1 made of resin, glass, ceramic or the like sandwiched between them. When an alternating electric field is generated, a plasma jet 6 is generated along the surface of the insulator 1 from the edge 5 of the surface side electrode 2. In particular, since the surface plasma is concentrated at high speed, it has a characteristic that induced airflow 7 is generated by inducing surrounding gas. Therefore, using the generation of this induced airflow conventionally, in a wing such as an airplane wing, a blade of a jet engine or a blower, a surface plasma generator as described above is provided in a portion where the air flow is easily separated from the wing surface, Studies have been made to control the induced airflow generated by controlling the generation of surface plasma.

  The present invention uses such a surface plasma, and it has been found that ozone of a practical level can also be generated by this surface plasma, and the induced air current induced by the generation of the surface plasma has a large amount of surface plasma. Even if the voltage is high to generate plasma, it does not lead to arc discharge, making use of the characteristics that can continue silent discharge, and this surface plasma has the effect of preventing separation of the air flow on the blade surface in the moving blade, Considering that the induced air current induced by the surface plasma is actively used, it has been found that it is effective to use the surface plasma generator as an ion generator, and the present invention has been achieved.

  That is, in order to solve the above-described problem, the ozone generator according to the present invention is more specifically formed by disposing the back-side electrodes by shifting the positions of the electrodes on the back side of the front-side electrodes with the insulator interposed therebetween. Induced by a surface plasma generator that generates surface plasma from the edge of the surface electrode by applying an alternating voltage to both electrodes using an electrode pair, and a plasma jet flow of the surface plasma generated by the surface plasma generator A cylindrical body for guiding an air flow, wherein ozone generated by contact between the surface plasma and air is mixed with the air flow flowing through the cylindrical body, and then released from the cylindrical body.

  Another ozone generator according to the present invention is the ozone generator, wherein the surface plasma generator is formed on the entire inner peripheral surface of the cylindrical body to generate a cylindrical surface plasma, and the cylindrical surface plasma is used. An induced air flow is formed at the center of a cylindrical plasma jet.

  Another ozone generator according to the present invention is characterized in that in the ozone generator, a plurality of surface plasma generators for generating the surface plasma in the cylinder are provided in a plurality of stages in the air flow direction.

  Another ozone generator according to the present invention is characterized in that a plurality of surface plasma generators for generating the surface plasma are arranged in parallel in the ozone generator.

  In addition, since the present invention is configured as described above, it does not require a blower for supplying ozone to the outside, thereby preventing generation of noise by the blower, and the blower is not contaminated with dust or the like. A larger amount of ozone can be generated than an ozone generator using a needle electrode and a cylindrical electrode, and an ozone generator that does not generate arc discharge even when the voltage is increased in order to increase the amount of blown air can be obtained. .

  The ozone generator according to the present invention is an ozone generator that does not require a blower and does not generate arc discharge, so that the position of each electrode is shifted to the back side of the front side electrode with an insulator interposed therebetween. A surface plasma generator for generating surface plasma from the edge of the surface electrode by applying an alternating voltage to both electrodes using an electrode pair in which electrodes are arranged, and plasma of the surface plasma generated by the surface plasma generator A cylindrical body for guiding an air flow induced by a jet flow, and ozone generated by contact between the surface plasma and air is mixed with the air flow flowing through the cylindrical body and released from the cylindrical body It is a thing.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1A shows the principle of the surface plasma generator. Since this principle itself is as described above, a description thereof is omitted here. FIG.1 (b) has shown the schematic diagram of the ozone generator 10 which used the surface plasma generator shown in the figure (a) as it is. In the ozone generator 10 shown in FIG. 1B, similarly to the above, the front surface side electrode 12 and the back surface side electrode 13 are provided with an insulator 11 made of resin, glass, ceramic or the like interposed therebetween, and this is directly used in the cylinder 18. The example fixed to is shown.

  Also in the ozone generator 10, silent discharge is performed from the edge 15 of the surface side electrode 12 along the surface of the insulator 11 by connecting the AC power supply 14 to both electrodes 12 to generate a pulse and an AC electric field. As a result, a plasma jet 16 is generated. By this plasma jet, an induced air flow 17 is generated in the surroundings, whereby ambient air is sucked from the opening 19 of the cylindrical body 18 to become an intake air flow 20, and an air flow is formed in the cylindrical body 18. Thereby, room air is always supplied around the plasma jet 16, and a part of the supplied room air is ozonized by the surface plasma. The generated air stream containing ozone can be blown out as an ozone-containing air stream 21 from the opening 22 to the outside without a special blower.

  In order to use the above apparatus as an actual ozone generator, for example, as shown in FIG. 1 (c), the cylinder 18 shown in FIG. it can. When such an ozone generator 10 is used, switches for adjusting the ozone generation amount are appropriately provided, and the ozone generation amount is controlled by controlling the duty ratio of the pulse current supplied to the electrodes or by adjusting the supply voltage. Can be adjusted.

  Such an ozone generator can be further manufactured in various forms, for example, an ozone generator 30 as shown in the cross-sectional view of FIG. In the ozone generator 30 shown to Fig.2 (a), the example which formed the surface plasma generator in the whole inner surface of the cylinder 38 is shown. That is, a cylindrical insulator 31 is provided on the inner surface of the cylindrical body 38, the surface electrode 32 is provided on the inner surface side of the insulator 31, and the position is shifted from the surface electrode 32 on the outer surface side of the cylindrical body 38 on the back surface side. Provided.

  In the ozone generator shown in FIG. 2A as well, when a pulse current as an alternating current is supplied to the front electrode 32 and the back electrode 33, the edge of the front electrode 33 extends along the surface of the cylindrical insulator. As a result, surface plasma is generated in a cylindrical shape, and air at the center is induced to generate an induced airflow 37. A part of this induced airflow 37 is ozonized by surface plasma, blown as an ozone-containing airflow 41 from the opening 40 of the cylindrical body 21 to the outside of the room, and the indoor air is introduced from the opening 39 to continuously generate ozone. Occurrence occurs.

  An apparatus for generating a cylindrical surface plasma as described above can be manufactured, for example, in the form as shown in FIG. In the example shown in FIG. 2B, an example in which three cylindrical ozone generators 44 having a rectangular cross section are arranged in parallel is shown, and each ozone generator 44 is the same as that shown in FIG. This is configured and accommodated in the casing 43. Such an ozone generator 30 can generate ozone more efficiently than the apparatus shown in FIG. 1 (c), and the air flow can be sufficiently high.

  FIG. 2 (c) shows an example in which the ozone generator 44 in the ozone generator 30 shown in FIG. 2 (b) is formed in a cylindrical shape, and three ozone generators 44 are arranged in parallel in the illustrated example. Then, the plasma plasma generated by the surface plasma is generated by the same action as in FIG. 5B, and a part of the air in the induced airflow is ozonized and supplied into the room as an ozone-containing airflow. The inner diameter and the number of the ozone generating section 44 as described above can be arbitrarily selected and manufactured.

  In the above-described embodiment, an example in which a plurality of surface plasma generating portions for generating surface plasma are arranged side by side has been shown. However, for example, as shown in FIG. 3, the surface plasma generating portion shown in FIG. In this case, a plurality of, i.e., multiple stages may be arranged along the direction of the airflow flowing through the inside. The example shown in FIG. 3 shows an example in which three surface plasma generators A, B, and C are provided, and the number of stages can be arbitrarily selected. When the surface plasma generators are provided in multiple stages as described above, in addition to those provided in multiple stages in the single cylindrical apparatus as shown in FIG. 1, a plurality of cylindrical bodies are arranged in parallel as shown in FIGS. The provided one may be provided in multiple stages.

  Thus, the ozone generator provided with the surface plasma generator in multiple stages can increase the concentration of generated ozone as compared with the ozone generator having the surface plasma generator as a single stage. That is, the ozone generated in one surface plasma generation part is only generated from a part of the introduced air flow. Therefore, by providing the same surface plasma generation part in multiple stages, the air still having sufficient ozone generation ability is provided. With respect to the flow, it is possible to generate ozone at a higher concentration by the multi-stage surface plasma generator.

It is explanatory drawing of the ozone generator by this invention, (a) is a principle figure of surface plasma generation, (b) shows the basic composition of the ozone generator by the same surface plasma generation, (c) is an ozone generator It is a figure which shows the example of commercialization. It is a figure which shows the other ozone generator of this invention, (a) is sectional drawing, (b) is a perspective view of the example of commercialization, (c) is a perspective view of the other commercialization example. It is a figure which shows the other Example which has arrange | positioned the surface plasma generation part in multiple stages. It is a figure which shows the example of the conventional ozone generator. It is a figure which shows the example of the other conventional ozone generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Insulator 2 Front surface side electrode 3 Back surface side electrode 4 AC power supply 5 Edge 6 Plasma jet 7 Inductive air current 10 Ozone generator 11 Insulator 12 Front surface side electrode 13 Back surface side electrode 14 AC power source 15 Edge 16 Plasma jet 17 Induced air current 18 Cylindrical body 19 Opening 20 Intake air flow 21 Ozone-containing air flow 22 Opening 23 Casing

Claims (4)

Using an electrode pair in which the positions of the electrodes on the back side of the surface side electrode are shifted on the back side of the surface side electrode across the insulator, and an alternating voltage is applied to both electrodes, surface plasma is generated from the edge of the surface electrode. A surface plasma generator for generating
A cylindrical body for guiding an air flow induced by a plasma jet flow of the surface plasma generated by the surface plasma generator,
An ozone generator that mixes ozone generated by contact between the surface plasma and air into an air flow flowing through the cylinder and releases the mixture from the cylinder.   A cylindrical surface plasma is generated by forming the surface plasma generator on the entire inner peripheral surface of the cylindrical body, and an induced air flow is formed at the center of the cylindrical plasma jet by the cylindrical surface plasma. The ozone generator according to claim 1.   The ozone generator according to claim 1 or 2, wherein a plurality of surface plasma generators for generating surface plasma in the cylindrical body are provided in a plurality of stages in the air flow direction.   The ozone generator according to any one of claims 1 to 3, wherein a plurality of surface plasma generators for generating the surface plasma are arranged side by side.

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