JP5344353B2 - Electrode material manufacturing method and ozone ion generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an electrode material, which generates discharge stably, at a low cost by forming a titanium oxide film on a mesh-like member composed of a conductive linear material of titanium, and to provide a structure capable of utilizing a device performing the manufacturing method of electrode material as an ozone/ion generator, as it is. <P>SOLUTION: A pair of mesh-like members are arranged to face each other, and a pair of barrier discharge electrodes are disposed in the vicinity of the mesh-like members. Dielectrics are arranged on the surfaces of the barrier discharge electrodes facing each other, and discharge is generated between the mesh-like members. Furthermore, dielectric barrier discharge is generated between the barrier discharge electrodes, and a titanium oxide film is formed on the mesh-like members. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a method for producing an electrode material, in particular, an electrode material used in an ozone ion generator, and an ozone ion generator using the electrode material.

It has been conventionally known that ozone (O ₃ ) has a strong oxidizing action, and its oxidizing power is used to examine its use in various applications such as sterilization, antibacterial, deodorizing, decoloring, and removal of organic substances. Yes.
In general, ozone is discharged in the air by applying a high voltage between a pair of electrodes, thereby dissociating oxygen molecules (O ₂ ) in the air and generating negative ions (anions) (O ⁻ ). And then recombined with other oxygen molecules.

As an electrode material used in this ozone ion generator, the present inventor coats titanium oxide on an electrode material composed of a mesh member made of titanium in Japanese Patent Application Laid-Open No. 2008-226678 (Patent Document 1). The thing which enabled it to produce | generate ozone efficiently is proposed.
According to this technique, the mesh-like member is shot blasted with a blast material containing titanium oxide, so that the conductive linear material made of titanium constituting the mesh-like member is coated with titanium oxide. Then, at the outer peripheral edge of the mesh member, the end of the linear material on which the titanium oxide film is formed is exposed and discharged from the end to generate ozone.

However, in this technique, since titanium oxide is coated by shot blasting, a certain strength is required for the conductive linear material, and the wire diameter cannot be made very thin. According to the prior art, the wire diameter is at least 0.3 mm or more, and is substantially about 0.5 mm. For this reason, a titanium wire with a certain thickness is necessary, which causes high costs.
Further, there is a limit to the mesh interval, and the mesh cannot be made very small. According to the related art, the minimum interval is 2 mm, which is substantially about 3.0 mm. Therefore, there is a problem that the discharge effect is not always good, and there is a need for an electrode material that generates ozone ions more efficiently.

In addition, in the conventional ozone ion generator using the electrode material, ozone is generated by discharge between the mesh electrodes, so that the discharge voltage is low in the discharge between the mesh electrodes. In the air (H ₂ , HO ₂ ), it is difficult to perform ion decomposition. Moreover, although oxygen (O ₂ ) can be decomposed even at a low voltage, self-decomposition is intense and unstable. Furthermore, the discharge between the mesh electrodes is weak, the voltage at which O ions can be formed and combined with oxygen (O ₂ ) is low, and the amount (concentration) of ozone (O ₃ ) is not sufficient.
For these reasons, there is a problem that ozone having a sufficient concentration cannot be stably generated only by the discharge between the mesh electrodes.

JP 2008-226678 A

In view of the above-described problems of the prior art, the present invention provides a method for producing an electrode material in which a titanium oxide film is formed on a mesh member made of a conductive linear material made of titanium. As a manufacturing method, an electrode material having a small wire diameter can be used, the cost can be reduced, and an electrode material having a small mesh interval can be obtained.
The present invention also provides an ozone ion generator capable of efficiently generating ozone by generating a barrier discharge in the vicinity of the discharge between the electrodes made of the mesh member. .

In order to solve the above problems, the electrode material manufacturing method according to the present invention includes a portion in which a pair of the mesh members are disposed to face each other, a dielectric is provided on a part of the mesh members, and the dielectric is provided. Is used as a barrier discharge electrode, and a discharge is generated between the mesh members and a dielectric barrier discharge is generated between the barrier discharge electrodes to form a titanium oxide film on the mesh member.
Further, oxygen is supplied between the pair of barrier discharge electrodes.

Furthermore, in an ozone ion generator that includes a pair of electrodes arranged opposite to each other and generates ozone ions by discharge between the electrodes, the electrodes are formed of a conductive linear material made of titanium. It is made of an electrode material in which a titanium oxide film is formed on a member, and includes a pair of barrier discharge electrodes in the vicinity of the mesh member, and a dielectric on the opposing surface of the barrier discharge electrode. To do.
In addition, a metal plate is bent and provided so as to include a part of the mesh member and a power supply lead for supplying power to the mesh member, and the metal plate constitutes the barrier discharge electrode.
Further, a dielectric is provided on a part of the opposing surface of the mesh member, and the portion provided with the dielectric constitutes the barrier discharge electrode.
In addition, a part of the mesh member is folded, and a power supply lead for supplying power to the mesh member is sandwiched and electrically connected between the folded portions, and includes the folded portions of the pair of mesh members. A dielectric is disposed on the surface.
The dielectric is made of an insulating resin and is covered with a mesh member constituting the electrode.

  According to the method for producing an electrode material of the present invention, by using the barrier discharge between the barrier discharge electrodes in addition to the main discharge between the mesh members constituting the electrode material, Since materials such as O, Fe, Cr, and Ni are eluted from the inside of the base material (titanium) and a non-conductive film is formed to form an oxide film (titanium oxide film), a mesh like conventional shot blasting An oxide film can be formed without impacting the member, and the wire diameter of the mesh member can be as thin as 0.1 mm, for example.

According to the ozone ion generator of the present invention, since the barrier discharge electrode is disposed in the vicinity of the mesh member (electrode), O ions formed by separating oxygen by discharge between the mesh electrodes are converted into ozone. Without being used for formation, this is combined with the ozone generated by the barrier discharge and charged, and by surrounding the ozone, the self-degradability of ozone is prevented, and a sufficient amount of ozone (concentration) is stably maintained. This has the effect of being And, since the self-decomposition rate of ozone is low, the effectiveness of sterilization, deodorization, etc. is effectively exhibited without increasing the ozone concentration more than necessary, leading to low cost.
Also, the ions are charged with ozone, so that the ozone is surrounded and maintained as ions (O3 + e), which creates a situation where the amount of charged ions is large. By charging with ozone, the amount of ions increases, and when the amount of ions increases, charging efficiency by ions to the target component increases, and the ion effect increases.
In addition, by increasing the amount of ions, moisture and ions in the air are charged and a moisturizing effect can be obtained.

Explanatory drawing of the manufacturing method of the electrode material of this invention, and explanatory drawing of an ozone ion generator. Explanatory drawing of another Example. Explanatory drawing of another Example. Explanatory drawing of another Example. Explanatory drawing of another Example.

First, the manufacturing method of an electrode material is demonstrated.
FIG. 1 is an explanatory view of a method for producing an electrode material of the present invention, in which (A) is a perspective view and (B) is a front view.
The electrode material of the present invention comprises a mesh member 1 made of a conductive linear material made of titanium, and the pair of mesh members 1 and 1 are arranged so as to face each other with an appropriate interval. . The peripheral edge of the mesh member 1 protrudes so that the end of the linear material protrudes the needle tip as it is, and when the mesh member 1 is used as an electrode, the discharge also occurs from this protruding end. Is called.
A metal plate 5 is attached to the lower ends of the mesh members 1, 1, and the metal plate 7 is bent together with the mesh member 1, and the power supply leads 4 are encased in the metal plates 7. The member 1 is electrically connected.
Dielectric bodies 3 and 3 made of ceramic resin, polyimide resin, silica (silicon) resin, or the like are disposed on the opposing surfaces of the metal plates 5 and 5.
Thereby, the said metal plates 5 and 5 comprise a pair of barrier discharge electrodes 2 and 2 which oppose.
Then, oxygen (O ₂ ) may be supplied between the barrier discharge electrodes 2 as necessary.

In the above configuration, when the mesh member 1 (hereinafter also referred to as “mesh electrode”) and the barrier discharge electrode 2 are energized through the power supply leads 4 and 4, the main discharge X is generated between the mesh electrodes 1 and 1. At the same time, a dielectric barrier discharge Y is generated between the barrier discharge electrodes 2 and 2 via the dielectrics 3 and 3.
The strong discharge force of the barrier discharge also affects the mesh member 1 integrated therewith, and a strong discharge is formed between the mesh members 1, 1, and the strong discharge causes the mother of the mesh member 1. A material such as O, Fe, and Cr is diffused from the material (titanium) to the surface, and O ₂ is adsorbed and reacts on the surface to form a thin oxide film first. Since this oxide film is thin, electrons in the metal (titanium) pass through it, and O ₂ adsorbed on the surface is negatively charged. As a result, an electric field is generated between the surface of the oxide film and the surface of the metal, which causes O ions to be attracted to the interface between the metal and the oxide film to cause an oxidation reaction to form an oxide film having a predetermined thickness. is there.
When the oxide film grows to a certain thickness (2 to 5 μm), it is no longer affected by the electric field. Therefore, only the diffusion of oxygen ions in the oxide film becomes a factor of the oxide film, and the growth rate becomes very slow and the growth proceeds. Stop. For this reason, the thickness of the oxide film formed on the surface of the base material of the mesh member 1 is kept constant.

In the above embodiment, the barrier discharge electrode 2 is constituted by the metal plate 7 separate from the mesh electrode 1. However, a part of the mesh member may be a barrier discharge electrode.
The embodiment is shown in FIG. 2, and dielectrics 3 and 3 are provided on a part of opposing surfaces of a mesh electrode (mesh member) 1 and 1, and a portion provided with this dielectric is shown in FIG. The barrier discharge electrode 2 is configured.

  In the embodiment shown in FIG. 3, a part of the mesh electrode 1 is folded to form the folded portion 8, and the power supply lead 4 is included and sandwiched inside the folded portion 8. The dielectric 3 is provided in a portion including the folded portion 8, and the portion provided with the dielectric 3 constitutes the barrier discharge electrode 2.

In the embodiment described above, the dielectric 4 is shown separately from the mesh electrode 1 or the metal plate 7 (barrier discharge electrode 2). However, in FIG. Is shown.
In the embodiment shown in FIG. 4, as shown in FIG. 4A, an insulating resin such as a ceramic resin, a polyimide resin, or a silica (silicon) resin is sprayed and applied to a part of the mesh electrode 1, As shown in FIGS. 4B and 4C, a dielectric film 9 is formed on the mesh member 1.
The portion where the dielectric film 7 is formed constitutes the barrier discharge electrode 2. The spray coating of the insulating resin may be performed from one side of the mesh electrode 1 facing each other. However, in order to form a more reliable dielectric film 7, it is preferable to apply from both sides.

FIG. 5 shows a modified embodiment of the embodiment of FIG. 4, the lower end of the mesh electrode 1 is folded, and the feeding lead 4 is sandwiched by the folded portion 6. And mesh electrode 1 and barrier discharge electrode 2 are connected vigorously.
A part of the mesh member 1 including the folded portion 8 is covered with a dielectric film made of an insulating resin, and this portion constitutes the barrier discharge electrode 2. The folded portion 6 may be folded back to the opposite side as shown in FIG. 5A, or folded back to the opposite side as shown in FIG. 5B. May be.

2 to 5, the action of forming the titanium oxide film on the mesh member 1 is the same as that described in the embodiment 1 of FIG.
And

In the above description, the structure of FIGS. 1 to 5 has been described as an apparatus for forming a titanium oxide film on the mesh member 1 made of titanium. However, these apparatuses can be used as ozone / ion generators as they are. .
That is, for example, in the configuration of FIG. 1, at the start of operation of the apparatus, a pair of mesh members 1, 1 that are raw materials are installed and energized between the mesh member 1 and the barrier discharge electrode 2. By this energization, a main discharge is generated between the mesh members 1 and 1 and a barrier discharge is generated between the barrier discharge electrodes 2 and 2.
By these discharges, as described above, a titanium oxide film is first formed on the mesh member 1.
After the titanium oxide film is formed on the mesh member 1, it functions as an ozone / ion generator, and thereafter, when the operation is resumed after the operation is interrupted, it functions as an ozone / ion generator from the beginning.

The discharge X between the mesh electrodes 1 dissociates oxygen molecules (O ₂ ) in the atmosphere and generates negative ions (anions) (O ⁻ ), while the barrier discharge Y between the barrier discharge electrodes 2. As a result, a large amount of ozone (O ₃ ) is generated. Ions generated by the mesh electrode 1 are combined with the ozone and charged. As a result, ions bind to and surround the ozone, so that the self-decomposition of ozone is prevented and the amount of ozone (concentration) becomes stable.
That is, oxygen in the atmosphere is decomposed by the barrier discharge Y to generate ions (O ⁻ ), which are recombined with other oxygen molecules to generate ozone (O ₃ ), but the barrier discharge has a discharge voltage. Since it is high, ozone is immediately self-decomposed and separated, and the ozone concentration cannot be stably maintained. This ozone is charged by being combined with the main discharge X between the mesh electrodes and ions generated by the discharge from the protruding tip of the peripheral edge of the mesh electrode, thereby preventing the self-decomposition of ozone.
Further, by supplying oxygen (O ₂ ) between the barrier discharge electrodes 2, a large amount of ozone (O ₃ ) due to the barrier discharge is generated.

As described above, in the present invention, in the method for producing an electrode material in which a titanium oxide film is formed on a mesh member made of titanium, a pair of the mesh members are arranged to face each other and in the vicinity of the mesh member. A pair of barrier discharge electrodes is disposed on the surface of the barrier discharge electrode, and a dielectric is disposed on the opposite surfaces of the barrier discharge electrode to generate a discharge between the mesh members, and a dielectric barrier discharge between the barrier discharge electrodes. Since the titanium oxide film is formed on the mesh member by generating a large load on the mesh member when the titanium oxide film is formed unlike the conventional shot blast method, A diameter can be made thin and a significant cost saving can be achieved as an electrode material using expensive titanium.
Moreover, since the mesh | interval of a mesh electrode can be made small, the stable discharge is maintained.
Furthermore, the above structure can be used as an ozone / ion generator as it is, and in the initial stage of use, a titanium oxide film is naturally formed on the mesh member simply by energizing between the electrodes. is not.
Further, when it is repeatedly used as an ozone / ion generator thereafter, the function of generating ozone and ions is exhibited from the beginning of the restart.
As an ozone / ion generator, the ions generated by the discharge between the mesh electrodes are bound to and charged with the ozone generated by the barrier discharge, so that the self-decomposition of ozone is prevented and the ozone is generated. The effect is that the concentration is kept high.
Further, since ions are charged in ozone, the amount of ions is also stabilized.

1 Mesh member (mesh electrode)
2 Barrier discharge electrode 3 Dielectric 4 Feed lead 5 Metal plate (barrier discharge electrode)
6 Folding part 7 Dielectric coating X Main discharge Y Barrier discharge

Claims (7)

  In a method of manufacturing an electrode material in which a titanium oxide film is formed on a mesh member composed of a conductive linear material made of titanium, a pair of mesh members are arranged to face each other, and a part of the mesh member is formed. A portion provided with a dielectric is used as a barrier discharge electrode, and a discharge is generated between the mesh members and a dielectric barrier discharge is generated between the barrier discharge electrodes. A method for producing an electrode material, comprising forming a titanium oxide film. The method for producing an electrode material according to claim 1, wherein oxygen is supplied between the pair of barrier discharge electrodes.

In an ozone ion generator comprising a pair of electrodes arranged opposite to each other and generating ozone ions by discharge between the electrodes,
The electrode is made of an electrode material in which a titanium oxide film is formed on a mesh member made of a conductive linear material made of titanium, and a barrier discharge electrode is formed on a part of the mesh member, An ozone ion generator comprising a dielectric on the opposing surface of a barrier discharge electrode.
  The metal plate is bent and provided so as to include a part of the mesh member and a power supply lead for supplying power to the mesh member, and the metal plate constitutes the barrier discharge electrode. The ozone ion generator described in 1.   4. The ozone ion generator according to claim 3, wherein a dielectric is provided on a part of the opposing surface of the mesh member, and the portion provided with the dielectric constitutes the barrier discharge electrode. .   A part of the mesh member is folded, and a power supply lead for feeding power to the mesh member is sandwiched and electrically connected between the folded parts. The ozone ion generator according to claim 5, wherein a dielectric is provided. The ozone ion generator according to claim 5 or 6, wherein the dielectric is made of an insulating resin, and is covered with a mesh member constituting the electrode.

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