CN117580801A

CN117580801A - Ozone generator, ozone generating unit, and ozone generator

Info

Publication number: CN117580801A
Application number: CN202280045937.3A
Authority: CN
Inventors: 服部洋一; 上山刚; 西山宽幸; 莲沼英树; 今泉润哉; 瀬川昌幸; 大谷贵之; 横山崇广
Original assignee: NGK Spark Plug Co Ltd
Current assignee: Niterra Co Ltd
Priority date: 2021-07-02
Filing date: 2022-03-24
Publication date: 2024-02-20
Also published as: JP2023007610A; JP7398409B2

Abstract

The ozone generator (3) has a 1 st electrode (10), a 1 st dielectric (11) covering the 1 st electrode (10), a 2 nd electrode (30), and a 2 nd dielectric (31) covering the 2 nd electrode (30). A Discharge Space (DS) is formed between the 2 nd dielectric (31) and the 1 st dielectric (11). The ozone generator (3) further has a support section (50) for supporting the 1 st dielectric (11) and the 2 nd dielectric (31). The Young's modulus of the support part (50) is lower than that of either the 1 st dielectric (11) or the 2 nd dielectric (31).

Description

Ozone generator, ozone generating unit, and ozone generator

Technical Field

The present invention relates to an ozone generator, an ozone generating unit, and an ozone generator.

Background

Patent document 1 discloses a plasma generating electrode. The plasma generating electrode has electrodes opposite to each other. The electrode includes a ceramic body as a dielectric and a conductive film disposed inside the ceramic body. The electrodes facing each other are supported by the holding members, respectively.

Prior art literature

Patent literature

Patent document 1: WO2005/005798

Disclosure of Invention

Problems to be solved by the invention

In the technique of patent document 1, when the dielectric vibrates, a portion held by the holding member is stressed, and the dielectric may be broken.

The invention provides a technology capable of making dielectrics not easy to break.

Solution for solving the problem

[1] The ozone generator of the present invention comprises: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; and a 2 nd dielectric covering the 2 nd electrode. The ozone generator further includes a support portion for supporting the 1 st dielectric and the 2 nd dielectric. A discharge space is formed between the 1 st dielectric and the 2 nd dielectric. The Young's modulus of the support portion is lower than that of either the 1 st dielectric or the 2 nd dielectric.

According to such a structure, even if the 1 st dielectric or the 2 nd dielectric vibrates, the portion supported by the support portion is less susceptible to stress. Therefore, the 1 st dielectric and the 2 nd dielectric are not easily broken.

[2] The support portion may be configured to support the 1 st dielectric and the 2 nd dielectric by cantilever at one end side in an orthogonal direction orthogonal to a direction in which the 1 st dielectric and the 2 nd dielectric are aligned.

According to this structure, since the 1 st dielectric and the 2 nd dielectric are cantilever-supported on the same side, the 1 st dielectric and the 2 nd dielectric can be opened at the other end side in the orthogonal direction. Therefore, the gas easily enters the discharge space formed between the 1 st dielectric and the 2 nd dielectric, and as a result, the ozone generation efficiency can be improved.

[3] The support portion may have a spacer disposed between the 1 st dielectric and the 2 nd dielectric.

According to such a configuration, the interval between the 1 st dielectric and the 2 nd dielectric can be easily set by the spacer.

[4] The ozone generator may include: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal may include: a 1 st connection part electrically connected to the 1 st electrode; and a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward the one end side from an end portion of the 1 st dielectric. The 2 nd terminal may include: a 2 nd connection part electrically connected to the 2 nd electrode; and a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion. The spacer may be an insulating member, and the spacer may include: a spacer arranged between the 1 st dielectric and the 2 nd dielectric; and an extension portion extending from the spacer portion and disposed between the 1 st projection and the 2 nd projection.

With this configuration, the 1 st terminal and the 2 nd terminal can be insulated more reliably.

[5] The ozone generator may include: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal may include: a 1 st connection part electrically connected to the 1 st electrode; a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward the one end side from an end portion of the 1 st dielectric; and a 3 rd connection part bent and extended from the top end of the 1 st protruding part. The 2 nd terminal may include: a 2 nd connection part electrically connected to the 2 nd electrode; a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion; and a 4 th connecting portion bent and extended from a tip end of the 2 nd protruding portion.

According to this configuration, since the 3 rd connection portion of the 1 st terminal is bent and extended from the tip end of the 1 st protruding portion, the 1 st terminal can be restrained from expanding in the protruding direction of the 1 st protruding portion. Further, since the 4 th connecting portion of the 2 nd terminal is bent and extended from the tip end of the 2 nd protruding portion, the 2 nd terminal can be restrained from expanding in the protruding direction of the 2 nd protruding portion.

[6] The support portion may have a holder for holding the 1 st dielectric and the 2 nd dielectric with the spacer interposed therebetween.

According to this configuration, the spacing between the 1 st dielectric and the 2 nd dielectric can be kept constant by the spacers and the holders of the support portion.

[7] The ozone generator may include: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal may be disposed on the side of the 1 st dielectric opposite to the spacer side, and the 2 nd terminal may be disposed on the side of the 2 nd dielectric opposite to the spacer side. The holder may have a notch portion in which a notch is formed so as to expose the 1 st terminal and the 2 nd terminal.

According to this structure, the 1 st terminal and the 2 nd terminal can be easily embedded in the resin through the notch.

[8] The holder may have a 2 nd notch portion in which a notch is formed so as to expose the discharge space.

According to such a configuration, the outer peripheries of the 1 st dielectric and the 2 nd dielectric can be surrounded by the holder, and the gas is allowed to flow into the discharge space through the 2 nd notch. Therefore, the decrease in the inflow amount of the gas into the discharge space due to the provision of the holder can be suppressed.

[9] The inter-dielectric gap, which is the gap between the 1 st dielectric and the 2 nd dielectric, may be 0.15mm or more.

According to this structure, the gas is easily introduced into the discharge space, and the gas is easily discharged from the discharge space.

[10] The invention of the ozone generating unit having [1] to [9] any one of the ozone generator and thermosetting resin. The above-mentioned support portion of the above-mentioned ozone generator supports the above-mentioned 1 st dielectric medium and above-mentioned 2 nd dielectric medium on one end side cantilever of the orthogonal direction of the above-mentioned 1 st dielectric medium and above-mentioned 2 nd dielectric medium of the direction orthogonal to side by side, the above-mentioned ozone generator has: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal has: a 1 st connection part electrically connected to the 1 st electrode; and a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward the one end side from an end portion of the 1 st dielectric. The 2 nd terminal has: a 2 nd connection part electrically connected to the 2 nd electrode; and a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion. The thermosetting resin is provided between the 1 st projection and the 2 nd projection.

According to such a configuration, since the 1 st projection and the 2 nd projection are configured to project toward one end side of the 1 st dielectric and the 2 nd dielectric, respectively, the distance between the 1 st projection and the 2 nd projection is relatively short. However, since the 1 st projection and the 2 nd projection are insulated by the thermosetting resin provided between the 1 st projection and the 2 nd projection, insulation between the 1 st projection and the 2 nd projection can be ensured by the thermosetting resin.

[11] The invention of the 1 st ozone generator has a gas flow path, a fan and any one of [1] to [9] ozone generator. The fan sends air from the air inlet side to the air outlet side of the flow path. The ozone generator generates ozone in the flow path using air sucked from the air inlet as a raw material.

According to the structure, can be applied to the [1] to [9] any ozone generator.

[12] In the ozone generator according to [11], the support portion of the ozone generator may support the 1 st dielectric and the 2 nd dielectric by being cantilevered at one end side in an orthogonal direction orthogonal to a direction in which the 1 st dielectric and the 2 nd dielectric are aligned, and the support portion may be held at a position outside a wall surface of the flow path. The 1 st dielectric and the 2 nd dielectric of the ozone generator may be disposed so as to protrude inward from the wall surface.

According to this structure, compared with a double-support structure or a structure with staggered cantilever support, the structure for fixing the ozone generator and the wiring can be concentrated, and therefore the structure can be simplified.

[13] The ozone generator may have a flow path structure portion provided with the flow path inside. The ozone generator may include an axial flow fan that generates a vortex flow around a central axis in the flow path, and may send the gas from the inlet side to the outlet side of the flow path. In the ozone generator, one end of the 1 st dielectric and one end of the 2 nd dielectric may be supported by the flow path structure portion, and the other end of the 1 st dielectric and the other end of the 2 nd dielectric may be separated from an inner wall surface of the flow path structure portion, and a discharge space may be provided between the 1 st dielectric and the 2 nd dielectric. The gas inlet may include an end portion of the 1 st dielectric different from the one end and the other end, and an end portion of the 2 nd dielectric opposite to the end portion of the 1 st dielectric. The direction in which the gas enters from the gas inlet may be inclined with respect to the central axis line in the rotation direction of the axial flow fan.

According to this configuration, since the direction in which the gas enters from the gas inlet is inclined with respect to the rotation direction of the axial flow fan with respect to the central axis, the gas is easily introduced from the gas inlet into the discharge space. Thus, the ozone generating efficiency of the ozone generator is improved.

[14] The support portion may cantilever-support the 1 st dielectric and the 2 nd dielectric at one end side in an orthogonal direction orthogonal to a direction in which the 1 st dielectric and the 2 nd dielectric are aligned. The 1 st dielectric may have a 1 st surface facing the 2 nd dielectric and forming the discharge space between the 2 nd dielectric and the 1 st surface. The 2 nd dielectric may have a 2 nd surface opposite to the 1 st surface. In the ozone generator, the inclination angle θ of the 1 st surface with respect to the 2 nd surface may satisfy the following formula (I) when the direction in which the 1 st surface is away from the 2 nd surface on the other end side in the orthogonal direction is positive,

-1.8[% ] is less than or equal to tan θ×100 is less than or equal to 3.0[% ] … ….

According to this structure, since the 1 st dielectric and the 2 nd dielectric are cantilever-supported on the same side, the 1 st dielectric and the 2 nd dielectric can be opened at the other end side in the orthogonal direction. Therefore, the gas easily enters the discharge space formed between the 1 st dielectric and the 2 nd dielectric, and as a result, the ozone generation efficiency can be improved. Further, since the inclination angle θ is set in a range satisfying the formula (I), it is possible to suppress a case where the gas is not easily flowed into the discharge space due to a decrease in the opening of the other end side of the ozone generator in the orthogonal direction and a case where the ozone generated in the discharge space is not easily discharged, and to suppress the generation of electromagnetic noise due to discharge due to a decrease in the opening of the other end side of the ozone generator in the orthogonal direction.

[15] The ozone generator of the invention 2 has a gas flow path, a fan, the ozone generator, and a diffusion plate. The fan sends air from the air inlet side to the air outlet side of the flow path. The ozone generator is provided in the flow path, and generates ozone in the flow path. The diffusion plate is disposed downstream of the ozone generator in the flow path.

According to this configuration, the ozone generated by the ozone generator is diffused by the diffusion plate disposed further downstream, so that the concentration of ozone in the vicinity of the exhaust port of the flow path can be dispersed.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the dielectric can be made less likely to be broken.

Drawings

Fig. 1 is a perspective view of an ozone generator according to embodiment 1.

Fig. 2 is a perspective view of a cross section of an ozone generator.

Fig. 3 is a cross-sectional view of the ozone generator taken in a different cross-section than fig. 2.

Fig. 4 is a perspective view of an ozone generator.

Fig. 5 is a view of the ozone generator when viewed from the short side direction.

Fig. 6 is a view of the ozone generator viewed from the side-by-side direction.

Fig. 7 is an exploded perspective view of the ozone generator.

Fig. 8 is a perspective view showing a state before the holder of the ozone generator is attached.

Fig. 9 is a cross-sectional view A-A of fig. 6.

Fig. 10 is a perspective view showing a state in which the ozone generator is held by the holding portion in a state in which the resin member is omitted.

Fig. 11 is a cross-sectional view of the ozone generator shown in fig. 10, in which the ozone generator is cut by a cross-section along the longitudinal direction.

Fig. 12 is a view corresponding to fig. 11 in a state where the resin member is not omitted.

Fig. 13 is a block diagram showing an electrical structure of the ozone generator.

Fig. 14 is a view of the ozone generator according to embodiment 2 as seen from the short side direction.

Fig. 15 is an enlarged view of the tip portions of the 1 st electrode and the 2 nd electrode.

Fig. 16 is an explanatory diagram showing experimental results concerning the ozone generation amount.

Fig. 17 is an explanatory diagram showing the experimental results concerning noise.

Fig. 18 is an explanatory diagram showing experimental results concerning ozone generation amount and noise.

Fig. 19 is an explanatory view illustrating the inclination angle of the 1 st surface with respect to the 2 nd surface of the ozone generator according to embodiment 3.

Fig. 20 is an explanatory diagram showing the experimental results of embodiment 3.

Fig. 21 is a plan view of an ozone generator according to embodiment 4, with a finger guard removed.

Fig. 22 is a cross-sectional view of the same cross-sectional plane as fig. 2, as seen from the side.

Fig. 23 is an enlarged view of a portion of the periphery of the ozone generator and the diffusion plate of fig. 22.

Fig. 24 is a cross-sectional view corresponding to fig. 2 of embodiment 5.

Fig. 25 is a cross-sectional view corresponding to fig. 3 of embodiment 5.

Fig. 26 is a cross-sectional view of the same cross-sectional plane as fig. 24, as seen from the side.

Fig. 27 is a view showing a part of a cross section of the ozone generator according to embodiment 6, which corresponds to fig. 26.

Fig. 28 is a cross-sectional view corresponding to fig. 26 of the ozone generator according to embodiment 7.

Fig. 29 is an explanatory view for explaining a method of measuring the eddy current angle.

Detailed Description

1. Embodiment 1

1-1. Structure of ozone generator

The ozone generator 100 shown in fig. 1 is a device that sucks in outside air (air containing oxygen) and generates ozone from the oxygen in the air by dielectric barrier discharge and discharges the ozone to the outside. As shown in fig. 2 and 3, the ozone generator 100 includes a gas flow path 1, a fan 2, and an ozone generator 3.

The flow path 1 has an intake port 5 and an exhaust port 6. The inlet 5 introduces air (e.g., air) outside the ozone generator 100 into the flow path 1. The exhaust port 6 discharges the gas in the flow path 1 to the outside of the ozone generator 100. The flow path 1 discharges the gas sucked from the suction port 5 from the discharge port 6.

The flow path 1 extends along a predetermined Z direction (vertical direction in the present embodiment). The air inlet 5 is disposed at one end side (lower end side in the present embodiment) in the Z direction, and opens to one end side (lower side in the present embodiment) in the Z direction. The suction direction of the suction port 5 is the other end side (upper side in the present embodiment) in the Z direction. The exhaust port 6 is disposed on the other end side (upper end side in the present embodiment) in the Z direction, and opens to the other end side (upper side in the present embodiment) in the Z direction. The exhaust direction of the exhaust port 6 is the other end side (upper side in the present embodiment) in the Z direction.

The air inlet 5 is arranged along an annular shape (specifically, an annular shape) having the Z direction as an axial direction. The exhaust port 6 is disposed inside the annular portion where the intake port 5 is disposed. The exhaust port 6 is arranged in a circular shape.

The flow path 1 includes a 1 st flow path 7 and a 2 nd flow path 8 downstream of the 1 st flow path 7. The 1 st flow path 7 extends from the intake port 5 to the exhaust port 6. The 1 st flow path 7 guides the air sucked from the annular air inlet 5 to the inside of the inner periphery of the air inlet 5. The 2 nd flow path 8 extends from the end portion on the downstream side of the 1 st flow path 7 toward the other end side (upper side in the present embodiment) in the Z direction of the exhaust port 6. The downstream end of the 2 nd flow path 8 is connected to the exhaust port 6. The 2 nd flow path 8 has a smaller outer shape than the inner periphery of the annular intake port 5, and guides the gas inwardly guided through the 1 st flow path 7 toward the exhaust port 6 (upward in the present embodiment) and discharges the gas from the exhaust port 6.

The fan 2 is a device that generates an air flow (specifically, a vortex flow) in the flow path 1, and is an axial flow fan in this embodiment. The fan 2 performs a blowing operation for feeding air from the air inlet 5 side toward the air outlet 6 side of the flow path 1. The fan 2 has a motor (not shown). The fan 2 is driven by the motor by supplying electric power, and performs a blowing operation. The fan 2 is provided in the flow path 1 (specifically, the 2 nd flow path 8). The fan 2 is disposed with the central axis of the fan 2 directed in the Z direction. The fan 2 rotates in the Z direction as an axial direction.

The ozone generator 3 generates a dielectric barrier discharge in a discharge space DS described later by applying an ac voltage, and generates ozone in the flow path 1 using oxygen in the air sucked through the inlet 5 as a raw material. As shown in fig. 4 to 7, the ozone generator 3 includes a 1 st electrode 10, a 2 nd electrode 30, a 1 st dielectric 11, a 2 nd dielectric 31, a 1 st terminal 12, a 2 nd terminal 32, and a support portion 50.

The 1 st electrode 10 and the 2 nd electrode 30 are made of metal, and in the present embodiment, tungsten (W) is formed as a material. The 1 st electrode 10 and the 2 nd electrode 30 are not limited to tungsten, and may be formed of molybdenum (Mo), silver (Ag), copper (Cu), platinum (Pt), or the like as a material. The 1 st electrode 10 and the 2 nd electrode 30 are formed as thin metal layers and are long in a predetermined direction. The thickness of the 1 st electrode 10 and the 2 nd electrode 30 (metal layers) is preferably 10 μm or more from the viewpoint of securing bonding strength, and preferably 50 μm or less from the viewpoint of suppressing peeling due to excessive thickness. The width and length of the 1 st electrode 10 and the 2 nd electrode 30 are arbitrarily set according to the required ozone generation amount. The width WE (see fig. 6) of the 1 st electrode 10 and the 2 nd electrode 30 is set to 1mm. The lengths of the 1 st electrode 10 and the 2 nd electrode 30 are set with reference to the length LE of the portion where discharge occurs (the length LE of the portion where the support portion 50 does not exist between the 1 st electrode 10 and the 2 nd electrode 30) (see fig. 5). The length LE is set to 10mm.

In the present embodiment, the 1 st dielectric 11 and the 2 nd dielectric 31 are made of alumina (Al ₂ O ₃ ) Is formed as a material. The 1 st dielectric 11 and the 2 nd dielectric 31 are not limited to alumina, and glass (SiO ₂ ) Aluminum nitride (AlN), yttrium oxide (Y) ₂ O ₃ ) And other ceramics, and mixtures thereof. Dielectric 11 1 covers electrode 10 1 and dielectric 31 2 covers electrode 30. The 1 st dielectric 11 and the 2 nd dielectric 31 are each plate-shaped.

The 1 st dielectric 11 and the 2 nd dielectric 31 are arranged side by side in the thickness direction of the 1 st dielectric 11 and the 2 nd dielectric 31. That is, the 1 st dielectric 11 and the 2 nd dielectric 31 are opposed in the thickness direction of the 1 st dielectric 11 and the 2 nd dielectric 31. A discharge space DS is formed between the 1 st dielectric 11 and the 2 nd dielectric 31. The surfaces facing each other are flat surfaces and rectangular. One of the faces opposite to each other extends along the other face. One of the faces opposite to each other may or may not be parallel to the other face. The thickness direction of the 1 st electrode 10 and the 2 nd electrode 30 is the same as the thickness direction of the 1 st dielectric 11 and the 2 nd dielectric 31. The direction in which the 1 st dielectric 11 and the 2 nd dielectric 31 are aligned will be hereinafter referred to as "alignment direction".

The 1 st electrode 10 is arranged in the 1 st dielectric 11 at a position on the 2 nd electrode 30 side in the parallel direction. The 2 nd electrode 30 is arranged in the side-by-side direction on the 1 st electrode 10 side in the 2 nd dielectric 31. The 1 st electrode 10 and the 2 nd electrode 30 are arranged on the upper surface of the dielectric layer formed thinner by printing or the like. A slightly thicker dielectric layer is formed over the 1 st electrode 10 and the 2 nd electrode 30 to manufacture the 1 st dielectric 11 covering the 1 st electrode 10 and the 2 nd dielectric 31 covering the 2 nd electrode 30.

The thickness of the portion of the 1 st dielectric 11 closer to the discharge space DS than the 1 st electrode 10 (the distance between the surface of the 1 st electrode 10 closer to the discharge space DS and the surface of the 1 st dielectric 11 closer to the discharge space DS) is D1 (see fig. 5). The thickness of the portion of the 2 nd dielectric 31 closer to the discharge space DS than the 2 nd electrode 30 (the distance between the surface of the 2 nd electrode 30 closer to the discharge space DS and the surface of the 2 nd dielectric 31 closer to the discharge space DS) is D2 (see fig. 5). In this case, the minimum value of d1+d2 is obtained by the following formula (1).

(minimum value of d1+d2) = (voltage [ kV ] applied to ozone generator 3)/(withstand voltage (kV/mm) … … (1) of the material of dielectric 11 of 1 st and dielectric 31 of 2 nd)

The withstand voltage of alumina was 15kV/mm, and when the peak value of the high-voltage AC voltage was 4.5kV, the minimum value of D1+D2 was 0.3mm.

On the other hand, if D1 and D2 are too thick, the loss in the 1 st dielectric 11 and the 2 nd dielectric 31 increases, and the power efficiency decreases. Therefore, the maximum value of d1+d2 is about 2 times the minimum value of d1+d2. Specifically, D1+D2 is preferably 0.3mm or more and 0.6mm or less. That is, it is preferable that D1 and D2 are each 0.15mm or more and 0.3mm or less. In this embodiment, D1 and D2 are each set to 0.15mm in view of ease of manufacturing.

The extending direction (longitudinal direction) of the 1 st electrode 10 and the 2 nd electrode 30 is the same as the longitudinal direction (hereinafter, simply referred to as "longitudinal direction") of the 1 st dielectric 11 and the 2 nd dielectric 31. The longitudinal direction corresponds to an example of "an orthogonal direction orthogonal to the direction in which the 1 st dielectric and the 2 nd dielectric are aligned. One end side (one side) in the longitudinal direction corresponds to one example of one end side (one side) in the orthogonal direction. The other end side (other side) in the longitudinal direction corresponds to one example of the other end side (other side) in the orthogonal direction. Hereinafter, the short side directions of the 1 st dielectric 11 and the 2 nd dielectric 31 are simply referred to as "short side directions".

The 1 st dielectric 11 has a 1 st dielectric body 13, a 1 st extension 14, and a 1 st recess 15. The 1 st dielectric body 13 has a plate shape and a rectangular parallelepiped shape. The 1 st dielectric body 13 covers the 1 st electrode 10. The 1 st extension portion 14 extends outward of the 1 st dielectric 11 (on the side opposite to the 2 nd dielectric 31) at one end in the longitudinal direction. The 1 st extension 14 is formed in the entire area in the short side direction in the 1 st dielectric 11. The 1 st extension 14 is formed to one end of the 1 st dielectric 11 in the longitudinal direction. The 1 st concave portion 15 is formed on one end side in the longitudinal direction on the surface of the 1 st dielectric 11 on the outer side (the side opposite to the 2 nd dielectric 31 side). The 1 st concave portion 15 is formed to concave the 1 st protruding portion 14. The 1 st recess 15 is open at one end in the longitudinal direction of the 1 st dielectric 11.

The 2 nd dielectric 31 has a 2 nd dielectric body 33, a 2 nd extension 34, and a 2 nd recess 35. The 2 nd dielectric body 33 has a plate shape and a rectangular parallelepiped shape. The 2 nd dielectric body 33 covers the 2 nd electrode 30. The 2 nd dielectric body 33 is opposed to the 1 st dielectric body 13, and a discharge space DS is formed between the 2 nd dielectric body 33 and the 1 st dielectric body 13. The 2 nd extension 34 extends outward of the 2 nd dielectric 31 (on the side opposite to the 1 st dielectric 11) at one end in the longitudinal direction. The 2 nd extension 34 is formed in the entire area in the short side direction in the 2 nd dielectric 31. The 2 nd extension 34 is formed to one end of the 2 nd dielectric 31 in the longitudinal direction. The 2 nd recess 35 is formed on one end side in the longitudinal direction on the surface of the outer side (the side opposite to the 1 st dielectric 11 side) of the 2 nd dielectric 31. The 2 nd concave portion 35 is formed to concave the 2 nd protruding portion 34. The 2 nd recess 35 is open at one end in the longitudinal direction of the 2 nd dielectric 31.

Regarding the distance between the 1 st dielectric 11 (specifically, the 1 st dielectric body 13) and the 2 nd dielectric 31 (specifically, the 2 nd dielectric body 33), that is, the inter-dielectric gap GC (see fig. 5), when considering that the withstand voltage of air is about 3.0kV/mm, when the peak value of the alternating voltage applied to the ozone generator 3 is 4.5kV, the inter-dielectric gap GC needs to be set to be less than 1.5mm in order to discharge the same. However, in order to extend the discharge time and maintain stable discharge, it is preferable to set the discharge time to one third or less, that is, 0.5mm or less. On the other hand, if the inter-dielectric gap GC is too small, the supplied air is insufficient, and the ozone generation amount decreases. Therefore, the inter-dielectric gap GC is preferably 0.2mm or more. For example, it is preferable that the inter-dielectric gap GC be 0.37mm. When the opposing surfaces of the 1 st dielectric 11 and the 2 nd dielectric 31 are not parallel to each other, the inter-dielectric gap GC is based on the positions of the tips (the other ends in the longitudinal direction) of the 1 st electrode 10 and the 2 nd electrode 30.

The natural frequency Fn [ Hz ] of the 1 st dielectric 11 and the 2 nd dielectric 31 is 200Hz or more in the structure in which the 1 st dielectric 11 and the 2 nd dielectric 31 are cantilever-supported. The natural frequency Fn [ Hz ] may be derived from the experimental result or may be obtained from an arithmetic expression. When the natural frequency Fn [ Hz ] is obtained by an operation formula, it can be obtained by the following formula (a), for example.

[ mathematics 1]

Kn is a constant and is 1.875 in the case of the structure in which the 1 st dielectric 11 and the 2 nd dielectric 31 are cantilever-supported. E [ Pa ]]Is the young's modulus of the 1 st dielectric 11 and the 2 nd dielectric 31. E [ Pa ]]In the case where the 1 st dielectric 11 and the 2 nd dielectric 31 are alumina, the thickness is about 280 GPa. I [ m ] ⁴ ]Is the moment of area inertia of the 1 st dielectric 11 and the 2 nd dielectric 31. ρ [ kg/m ] ³ ]Is the density of dielectric 11 and dielectric 31 of 1 st and 2 nd. Am is a number ² ]Is the cross-sectional area of dielectric 1, 11 and dielectric 2, 31. L [ m ]]The length from the fixed end to the free end of the 1 st dielectric 11 and the 2 nd dielectric 31 supported by the supported portion 50 (see fig. 5).

L needs to be longer than the lengths LE of the 1 st electrode 10 and the 2 nd electrode 30. On the other hand, if L is too long, the natural frequency Fn [ Hz ] becomes small. Therefore, in this embodiment, L is set to 21.5mm. In this case, the natural frequency Fn [ Hz ] is 3500Hz, which greatly exceeds 200Hz. If the thickness of the 1 st dielectric 11 and the 2 nd dielectric 31 is 1.15mm, the natural frequency Fn [ Hz ] is 200Hz or more if L is 90mm or less. Further, if the thicknesses of the 1 st dielectric 11 and the 2 nd dielectric 31 are made thicker, the natural frequency Fn [ Hz ] can be made 200Hz even if L is longer.

The 1 st electrode 10 and the 2 nd electrode 30 are of the same size and the same shape, and are arranged in a plane-symmetrical positional relationship. The 1 st dielectric 11 and the 2 nd dielectric 31 are of the same size and the same shape, and are arranged in a plane-symmetrical positional relationship.

The 1 st electrode 10 and the 2 nd electrode 30 are arranged in a plane-symmetrical positional relationship with each other in the same size and shape. The 1 st dielectric 11 and the 2 nd dielectric 31 are identical in size and shape to each other and are arranged in a plane-symmetrical positional relationship.

The 1 st terminal 12 and the 2 nd terminal 32 are both made of metal and have a plate shape. The 1 st terminal 12 is arranged on the side of the 1 st dielectric 11 opposite to the spacer 51 side. The 2 nd terminal 32 is arranged on the side of the 2 nd dielectric 31 opposite to the spacer 51 side. The 1 st terminal 12 is disposed in the 1 st recess 15, and the 2 nd terminal 32 is disposed in the 2 nd recess 35. The 1 st terminal 12 is electrically connected to the 1 st electrode 10, and the 2 nd terminal 32 is electrically connected to the 2 nd electrode 30. The 1 st terminal 12 and the 2 nd terminal 32 each have an L-letter shape as viewed in the short side direction.

The 1 st terminal 12 has a 1 st connection portion 21, a 1 st protrusion portion 22, and a 3 rd connection portion 23. As shown in fig. 5 and 6, the 1 st connection portion 21 is electrically connected to the 1 st electrode 10 via the 1 st conductive portion 24 provided in the 1 st dielectric 11. In the present embodiment, the 1 st conductive portion 24 is a via hole formed in the 1 st dielectric 11. The 1 st conductive portion 24 extends from the 1 st electrode 10 to a surface outside the 1 st dielectric 11 (on the side opposite to the 2 nd dielectric 31 side). The 1 st conductive portion 24 is exposed on the surface of the outer side (the side opposite to the 2 nd dielectric 31 side) of the 1 st dielectric 11, and a pad is formed on the exposed portion of the 1 st conductive portion 24. The 1 st connection portion 21 is soldered to the pad. Thus, the 1 st terminal 12 is electrically connected to the 1 st electrode 10. The 1 st protruding portion 22 is connected to one end of the 1 st connecting portion 21, and protrudes toward one end side from the end of the 1 st dielectric 11. That is, the 1 st protruding portion 22 protrudes from one end of the 1 st dielectric 11 in a direction away from the 1 st dielectric 11 when viewed from the side-by-side direction. The 3 rd connecting portion 23 is bent from the tip (one end side end) of the 1 st protruding portion 22 and extends in the side-by-side direction.

The 2 nd terminal 32 has a 2 nd connection portion 41, a 2 nd protrusion portion 42, and a 4 th connection portion 43. The 2 nd connection portion 41 is electrically connected to the 2 nd electrode 30 via a 2 nd conductive portion 44 provided in the 2 nd dielectric 31. In the present embodiment, the 2 nd conductive portion 44 is a via hole formed in the 2 nd dielectric 31. The 2 nd connection portion 41 is connected to the 2 nd electrode 30 in the same manner as the connection between the 1 st connection portion 21 and the 1 st electrode 10. The 2 nd protrusion 42 is connected to one end of the 2 nd connection 41, and protrudes toward one end side from the end of the 2 nd dielectric 31. That is, the 2 nd protruding portion 42 protrudes from one end of the 2 nd dielectric 31 in a direction away from the 2 nd dielectric 31 when seen in the side-by-side direction. The 4 th connecting portion 43 is bent from the tip (one end side end) of the 2 nd protruding portion 42 and extends in the side-by-side direction. The 3 rd and 4 th connecting portions 23 and 43 extend in opposite directions to each other.

The support 50 supports the 1 st dielectric 11 and the 2 nd dielectric 31. The support portion 50 supports the 1 st dielectric 11 and the 2 nd dielectric 31 at one end side in the longitudinal direction in a cantilever manner. That is, the support portion 50 cantilever supports the 1 st dielectric 11 and the 2 nd dielectric 31 on the same side. The young's modulus of the support portion 50 is lower than that of either the 1 st dielectric 11 or the 2 nd dielectric 31. The support portion 50 is formed of a resin (for example, polycarbonate (PC), ABS, PVC, PP, or the like) as a material. The Young's modulus of these materials is about 1GPa to 2.5GPa, which is very small compared with the Young's modulus of alumina of 280 GPa. Accordingly, the vibration of the 1 st dielectric 11 and the 2 nd dielectric 31 formed of alumina is easily absorbed by the support portion 50.

The support portion 50 has a spacer 51 and a holder 52. The holder 52 is formed of, for example, a resin (for example, PE, PP, PS, ABS, PVC, PET, POM, PC, PBT, PPS, PEI, PTFE, PAI) or a ceramic.

The spacers 51 are disposed between the 1 st dielectric 11 and the 2 nd dielectric 31 on one end side in the longitudinal direction, and form discharge spaces DS between the 1 st dielectric 11 and the 2 nd dielectric 31 on the other end side in the longitudinal direction. The spacer 51 is a member different from the resin member 89 described later. That is, the spacer 51 is a single component (not a component in which a plurality of independent components are combined) and is configured as a member independent of the resin member 89. The spacer 51 is integrated with the resin member 89 after the resin member 89 is formed, but is formed as a single component at the time of assembling the support portion 50 to the 1 st dielectric 11 and the 2 nd dielectric 31 (at the time of disposing the spacer 51 between the 1 st dielectric 11 and the 2 nd dielectric 31). The spacer 51 has a plate shape. The spacer 51 is arranged with the thickness direction facing the side-by-side direction of the 1 st dielectric 11 and the 2 nd dielectric 31. The spacer 51 includes a spacer 53 disposed between the 1 st dielectric 11 and the 2 nd dielectric 31, and an extension 54 extending from the spacer 53 toward one end in the longitudinal direction and disposed between the 1 st projection 22 and the 2 nd projection 42. In this way, the distance between the 1 st dielectric 11 and the 2 nd dielectric 31 is easily set by the spacer 51, and the insulation between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y can be ensured.

The spacer 53 has a plate shape. The spacer 53 is in the range of the 1 st dielectric 11 and the 2 nd dielectric 31 in the short side direction. One end of the spacer 53 in the longitudinal direction is disposed on the other end side of the 1 st dielectric 11 and the 2 nd dielectric 31, and the other end of the spacer 53 in the longitudinal direction is disposed on the one end side of the other ends of the 1 st extension 14 and the 2 nd extension 34.

The extension 54 is plate-shaped. The thickness of the extension portion 54 is smaller than the thickness of the spacer portion 53. The thickness of the extension portion 54 may be not smaller than the thickness of the spacer portion 53, or may be the same as the thickness of the spacer portion 53, for example. The extension portion 54 extends to the outside in the short side direction than the end portions of both sides of the 1 st terminal 12 and the 2 nd terminal 32. The extension portion 54 extends toward one end side from one end side end portions of the 1 st terminal 12 and the 2 nd terminal 32 in the longitudinal direction. That is, the extension portion 54 extends in a direction away from the 1 st dielectric 11 and the 2 nd dielectric 31 in the longitudinal direction than the 1 st terminal 12 and the 2 nd terminal 32.

The ozone generator 3 has a double-sided tape 55 for adhering the 1 st dielectric 11 and the 2 nd dielectric 31 to the spacer 51. The 1 st dielectric 11 and the 2 nd dielectric 31 are adhered to the spacer 53 of the spacer 51 by the double-sided tape 55. In addition, instead of the double-sided tape 55, an adhesive may be applied to the spacer 51.

The spacer 51 is formed of, for example, a resin (for example, PE, PP, PS, ABS, PVC, PET, POM, PC, PBT, PPS, PEI, PTFE, PAI), a ceramic, or the like as a material. As an example of the present embodiment, the spacer 51 is formed of PET as a material.

The holder 52 is a member for holding the 1 st dielectric 11 and the 2 nd dielectric 31 sandwiching the spacer 51. The holder 52 is annular (specifically, square tubular) and is disposed so as to surround the outer peripheries of the 1 st dielectric 11 and the 2 nd dielectric 31 sandwiching the spacer 51. The holder 52 may have a circular ring shape or a shape other than a circular ring shape. The holder 52 includes a holder body 56, a locking portion 57, a 1 st notch portion 58, and a 2 nd notch portion 59.

The holder main body 56 has a ring shape (specifically, a square tubular shape). The holder body 56 may have a circular ring shape or a shape other than a circular ring shape. The holder main body 56 has a pair of 1 st wall portions 56A arranged on both sides in the side-by-side direction and a pair of 2 nd wall portions 56B arranged on both sides in the short-side direction.

The locking portion 57 protrudes inward from the inner surface of the holder body 56 on the other end side in the longitudinal direction. The locking portions 57 protrude from the inner surfaces of the pair of 1 st wall portions 56A, respectively. The locking portion 57 is formed in the entire area in the short side direction of the 1 st wall portion 56A.

The 1 st notch 58 is notched so as to expose the 1 st terminal 12 and the 2 nd terminal 32. The 1 st cutout 58 is formed by partially cutting out one end portion of the 1 st wall 56A in the longitudinal direction.

The 2 nd notch 59 is notched so as to expose the discharge space DS. The 2 nd cutout 59 is formed by partially cutting out the end portion on the other end side in the longitudinal direction of the pair of 2 nd wall portions 56B. One end of the 2 nd notch 59 in the longitudinal direction is disposed on the other end side of the other end of the 1 st notch 58 in the longitudinal direction. The width (interval in the parallel direction) of the 2 nd notch 59 is preferably larger than the inter-dielectric gap GC.

As shown in fig. 8, the holder 52 is externally fitted from the other end side in the longitudinal direction with the 1 st dielectric 11 and the 2 nd dielectric 31 sandwiching the spacer 51. The holder 52 is positioned by the engagement portion 57 contacting the longitudinal ends of the 1 st extension 14 of the 1 st dielectric 11 and the 2 nd extension 34 of the 2 nd dielectric 31. As shown in fig. 9, in the side-by-side direction, when the interval between the outer surfaces of the 1 st dielectric body 13 and the 2 nd dielectric body 33 in the state of sandwiching the spacer 51 is L1, the interval between the outer surfaces of the 1 st projecting portion 14 and the 2 nd projecting portion 34 in the state of sandwiching the spacer 51 is L2, the minimum interval between the inner surfaces of the pair of 2 nd wall portions 56B of the holder 52 is L3, and the interval between the inner surfaces of the pair of locking portions 57 of the holder 52 is L4, the following expressions (2) and (3) are established.

L1 is less than or equal to L4 … … type (2)

L4 < L2 is less than or equal to L3 … … type (3)

As shown in fig. 2 and 3, the ozone generator 100 includes a flow path structure portion 60, a peripheral wall portion 61, a bottom portion 62, a top portion 63, a finger guard 64, a suction portion 65, and a diffusion plate 66.

The flow path structure 60 is a portion constituting the flow path 1. A flow channel 1 is provided inside the flow channel structure 60. The flow path structure portion 60 is a structure that is divided into a plurality of (two in the present embodiment) divided bodies in the circumferential direction. Specifically, the flow path structure portion 60 includes a 1 st segment 60A and a 2 nd segment 60B that are divided in the circumferential direction, and the flow path structure portion 60 is configured by connecting the 1 st segment 60A and the 2 nd segment 60B.

The peripheral wall portion 61 is annular (specifically, cylindrical, more specifically, cylindrical) and surrounds the flow path structure portion 60 and the outer periphery of the flow path 1. The diameter of the outer periphery of the ozone generator 100 (the outer diameter of the peripheral wall portion 61) is 225mm, for example, and the height of the ozone generator 100 is 204mm, for example.

The bottom 62 is a portion placed on the placement surface. The bottom 62 supports the flow path structure 60 disposed on the upper side. The bottom 62 is positioned inside the air inlet 5 arranged in a ring shape. The bottom 62 has a smaller outer shape than the inner periphery of the peripheral wall 61.

The top 63 is disposed on the other end side of the ozone generator 100 in the Z direction, and has a ring shape with the Z direction as an axial direction. An exhaust port 6 is formed inside the top 63. The outer periphery of the top 63 is connected to the other end (in the present embodiment, the upper end) of the peripheral wall 61, and is integrally formed with the peripheral wall 61. The peripheral wall portion 61 and the ceiling portion 63 are disposed above the flow path structure portion 60 with the finger guard 64 interposed therebetween, and are supported by the flow path structure portion 60. The peripheral wall portion 61 is supported in a state of being lifted from the mounting surface.

The finger guard 64 is a flat (circular in the present embodiment) portion in which a plurality of through holes are formed. The through hole is formed in a slit shape. The finger guard 64 has a function of allowing exhaust gas in the flow path 1 and suppressing entry of foreign matter (for example, fingers or the like) from the outside. The finger guard 64 is formed as a member different from the flow path structure 60 and the top 63. The hand guard 64 is disposed downstream of the ozone generator 3 and downstream of the diffusion plate 66.

The suction portion 65 is a portion where the suction port 5 is formed, and is annular. The air intake portion 65 is disposed between the inner peripheral side of the lower end side of the peripheral wall portion 61 and the outer peripheral side of the upper end side of the bottom portion 62, and is engaged with the flow path structure portion 60. The suction portion 65 is formed with a plurality of suction ports 5. The plurality of air inlets 5 are arranged in a ring shape along the ring-shaped air suction portion 65. The suction port 5 has a radially long shape.

The diffusion plate 66 diffuses ozone generated by the ozone generator 3 in the flow path 1. The diffusion plate 66 is disposed downstream of the ozone generator 3 in the flow path 1. The diffusion plate 66 protrudes inward from the wall surface 1A of the flow path 1. The diffusion plate 66 protrudes from a part of the wall surface 1A in the circumferential direction. The diffusion plate 66 becomes smaller in width as it is away from the wall surface 1A. The diffusion plate 66 has a fan shape. The diffusion plate 66 is disposed at a position overlapping the ozone generator 3 when viewed from the other end side in the Z direction. The diffusion plate 66 is integrally formed with the flow path structure portion 60 (specifically, the 1 st divided body 60A).

As shown in fig. 3, 10 and 12, the ozone generator 100 includes a holding portion 70, a 1 st counterpart terminal 71, a 2 nd counterpart terminal 72, a screw 73, an ac power supply 74 and a resin member 89. The ozone generator 3 constitutes an ozone generating unit 3U together with the holding portion 70, the 1 st counterpart terminal 71, the 2 nd counterpart terminal 72, the screw 73, the ac power source 74, and the resin member 89. The 1 st counterpart terminal 71 corresponds to the "1 st wiring" of the present disclosure. The 2 nd counterpart terminal 72 corresponds to "2 nd wiring" of the present disclosure. The 1 st counterpart terminal 71 is electrically connected to the 1 st terminal 12. The 2 nd counterpart terminal 72 is electrically connected to the 2 nd terminal 32. The 1 st conductor portion 3X is constituted by the 1 st counterpart terminal 71 and the 1 st terminal 12. The 1 st conductor portion 3X is electrically connected to the 1 st electrode 10, and extends from one end side (i.e., one end side in the longitudinal direction) of the 1 st dielectric 11 in the orthogonal direction (i.e., one end side in the longitudinal direction) orthogonal to the parallel direction of the 1 st dielectric 11 and the 2 nd dielectric 31. The 2 nd conductor portion 3Y is constituted by the 2 nd counterpart terminal 72 and the 2 nd terminal 32. The 2 nd conductor portion 3Y is electrically connected to the 2 nd electrode 30, and extends from one end side (the same side as the 1 st conductor portion 3X) of the 2 nd dielectric 31 in the longitudinal direction.

As shown in fig. 12, the 1 st conductor portion 3X (more specifically, the 1 st connection portion 21 and the 1 st protruding portion 22) and the 2 nd conductor portion 3Y (more specifically, the 2 nd connection portion 41 and the 2 nd protruding portion 42) are opposed in the above-described side-by-side direction. A resin member 89 (thermosetting resin) described later is provided between the 1 st conductor portion 3X (more specifically, the 1 st connecting portion 21 and the 1 st projecting portion 22) and the 2 nd conductor portion 3Y (more specifically, the 2 nd connecting portion 41 and the 2 nd projecting portion 42) which are opposed to each other.

The holding portion 70 is a portion for holding the ozone generator 3. The holding portion 70 includes a 1 st accommodating portion 75, a terminal fixing portion 76, and a 2 nd accommodating portion 77. The 1 st accommodation portion 75 has a bottom surface 75B and a surrounding portion 75C protruding from the bottom surface 75B and surrounding the outer periphery of the holder 52. The 1 st accommodation portion 75 accommodates a portion on one end side in the longitudinal direction of the holder 52. At least a part of the holder 52 protrudes from the open end of the 1 st accommodation portion 75. In this way, the 1 st dielectric 11 and the 2 nd dielectric 31 can be held at a constant interval by the spacers 51 and the holders 52, and the 1 st dielectric 11 and the 2 nd dielectric 31 are held by the holding portion 70.

The 1 st housing portion 75 has a notch groove 75A into which the 1 st terminal 12 and the 2 nd terminal 32 of the ozone generator 3 are fitted. The terminal fixing portions 76 are provided corresponding to the 1 st terminal 12 and the 2 nd terminal 32, respectively. The terminal fixing portion 76 has an internal thread portion. The 3 rd connecting portion 23 of the 1 st terminal 12 is fastened to the terminal fixing portion 76 together with the 1 st counterpart terminal 71 by a screw 73. The 4 th connecting portion 43 of the 2 nd terminal 32 is fastened to the other terminal fixing portion 76 together with the 2 nd counterpart terminal 72 by a screw 73. The 1 st counterpart terminal 71 and the 2 nd counterpart terminal 72 are electrically connected to an ac power supply 74, respectively.

The 2 nd housing portion 77 houses at least the 1 st terminal 12 and the 2 nd terminal 32 as a whole in a portion on one end side in the longitudinal direction of the ozone generator 3 housed in the 1 st housing portion 75. The inside of the 2 nd accommodation portion 77 is resin molded by a thermosetting resin to a position at which at least the 1 st terminal 12 and the 2 nd terminal 32 are integrally buried. That is, the resin member 89 made of thermosetting resin is provided in the 2 nd housing portion 77. The resin member 89 is also embedded in the 1 st accommodation portion 75. The 1 st conductor portion 3X and the 2 nd conductor portion 3Y are embedded in a thermosetting resin (resin member 89). A thermosetting resin is provided between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y to insulate the 1 st conductor portion 3X and the 2 nd conductor portion 3Y. The insulation between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y can be ensured by the thermosetting resin (resin member 89), and occurrence of current leakage between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y can be suppressed. Further, the 1 st conductor portion 3X and the 2 nd conductor portion 3Y can be positioned toward one end side in the longitudinal direction (in a cantilever structure), and the ozone generator 3 can be made compact. Further, as described above, since the spacer 53 (the extension portion 54) is disposed between the 1 st terminal 12 (the 1 st protruding portion 22) and the 2 nd terminal 32 (the 2 nd protruding portion 42), the 1 st terminal 12 and the 2 nd terminal 32 can be insulated more reliably. The 1 st terminal 12 and the 2 nd terminal 32 are covered with a thermosetting resin (resin member 89) provided inside the 1 st notch portion 58. As shown in fig. 12, although a part (one end in the longitudinal direction) of the 1 st dielectric 11 and a part (one end in the longitudinal direction) of the 2 nd dielectric 31 are buried in the resin member 89, the upper end (surface exposed on the opening side of the 2 nd accommodating portion 77) of the resin member 89 is located below (on the bottom side of the 2 nd accommodating portion 77) the lower end (one end in the longitudinal direction) of the 2 nd notch portion 59. At least a part of the holder 52 (specifically, at least a part on the other end side than one end in the longitudinal direction of the 2 nd cutout 59) is in a state protruding from the molded resin.

The thermosetting resin constituting the resin member 89 is, for example, PF, EP (epoxy resin), PUR, DAP, SI. As an example of the present embodiment, the thermosetting resin constituting the resin member 89 is formed using EP as a material.

As shown in fig. 12, the resin member 89 includes a 1 st portion 91, a 2 nd portion 92, and a pair of 3 rd portions 93. The 1 st portion 91 is filled in the lower end side of the 1 st accommodating portion 75. The 1 st portion 91 is U-shaped when viewed in cross section as shown in fig. 12, and covers a lower end side portion of the extension portion 54. The 2 nd portion 92 is filled between the lower end of the 1 st dielectric 11, the lower end of the 2 nd dielectric 31, the 1 st terminal 12, and the 2 nd terminal 32. The 2 nd portion 92 sandwiches the upper end side portion of the extension portion 54 in the side-by-side direction. The 1 st portion 91 and the 2 nd portion 92 are integrally connected and filled in the 1 st accommodating portion 75. The 1 st part 91 and the 2 nd part 92 are filled in the 1 st accommodation part 75 via the notch groove 75A (see fig. 11) of the 1 st accommodation part 75 in a softened state by heating, for example, and then cured and molded.

As shown in fig. 12, a pair of 3 rd portions 93 sandwich the 1 st terminal 12 (specifically, the 1 st protruding portion 22) and the 2 nd terminal 32 (specifically, the 2 nd protruding portion 42). The 3 rd portion 93 on the 1 st dielectric 11 side is filled in the 1 st notch 58 of the holder 52 and the 1 st recess 15 of the 1 st dielectric 11. The 3 rd portion 93 on the 1 st dielectric 11 side covers the 3 rd connection portion 23 of the 1 st terminal 12 from above. The 3 rd portion 93 on the 1 st dielectric 11 side is filled inside the bent portion (portion between the 1 st protruding portion 22 and the 3 rd connecting portion 23) of the 1 st terminal 12. The 3 rd portion 93 on the 2 nd dielectric 31 side is filled in the 1 st notch 58 of the holder 52 and the 2 nd recess 35 of the 2 nd dielectric 31. The 3 rd portion 93 on the 2 nd dielectric 31 side covers the 4 th connection portion 43 of the 2 nd terminal 32 from above. The 3 rd portion 93 on the 2 nd dielectric 31 side is filled inside the bent portion (portion between the 2 nd protruding portion 42 and the 4 th connecting portion 43) of the 2 nd terminal 32.

As shown in fig. 12, the 1 st counterpart terminal 71 and the 2 nd counterpart terminal 72 are surrounded by a resin member 89. Therefore, the 1 st counterpart terminal 71 and the 2 nd counterpart terminal 72 can be fixed by the resin member 89 to suppress play. The resin member 89 covers the heads of the respective screws 73 from the upper side.

The holding portion 70 is fixed to the outer surface of the flow path structure portion 60. As shown in fig. 3, the holding portion 70 is disposed outside the wall surface 1A of the flow path 1. The support portion 50 of the ozone generator 3 is held outside the wall surface 1A. Thus, one end in the longitudinal direction of the 1 st dielectric 11 and one end in the longitudinal direction of the 2 nd dielectric 31 are supported by the flow path structure portion 60. An opening 1B is formed in the wall surface 1A of the flow path 1 so as to protrude the ozone generator 3 inward. The 1 st dielectric 11 and the 2 nd dielectric 31 of the ozone generator 3 are arranged in a state protruding from the opening 1B toward the inside of the wall surface 1A. At least a part of the 1 st electrode 10 and at least a part of the 2 nd electrode 30 are disposed inside the wall surface 1A. The holder 52 is also disposed so as to protrude from the opening 1B toward the inside of the wall surface 1A. Thus, the other end in the longitudinal direction of the 1 st dielectric 11 and the other end in the longitudinal direction of the 2 nd dielectric 31 are separated from the inner wall surface (wall surface 1A) of the flow path structure portion 60.

The ac power supply 74 has a transformer and is capable of supplying ac power. The ac power supply 74 generates a desired ac power based on the power supplied from the commercial power supply outside the ozone generator 100, and supplies the ac power to the ozone generator 3 and the like.

As shown in fig. 15, the ozone generator 100 includes a control unit 80, an operation unit 81, an ozone detection unit 82, a display unit 83, and a sound output unit 84. The control unit 80 controls the operation of the ozone generator 100. The control unit 80 is composed mainly of a microcomputer, and includes CPU, ROM, RAM, a driving circuit, and the like.

The operation unit 81 is a switch that switches on/off state by pressing, for example, a tact switch. A signal indicating the operation result of the operation unit 81 is input to the control unit 80. The ozone detecting unit 82 detects the ozone concentration of the air outside the ozone generator 100. A signal indicating the detection value of the ozone detecting section 82 is input to the control section 80.

The control unit 80 can control the operation of the ozone generator 3 by the ac power supply 74. The control unit 80 can control the ac voltage applied to the ozone generator 3 to adjust the amount of ozone generated by the ozone generator 3. The control unit 80 can adjust the amount of ozone generated based on the operation result of the operation unit 81. The control unit 80 can feedback-control the operation of the ozone generator 3 so that the ozone concentration approaches the target value based on the ozone concentration detected by the ozone detecting unit 82.

The control unit 80 can control the operation of the fan 2. The control unit 80 applies a PWM signal to the fan 2, thereby PWM-controlling the fan 2. Thereby, the control unit 80 can adjust the air volume.

The control unit 80 can control the operation of the display unit 83. The display unit 83 is, for example, an LED lamp. The display unit 83 indicates the on/off state of the power supply, the operation state of the fan 2, the ozone concentration of the outside, and the like, by the on state of the LED.

The control unit 80 can control the operation of the audio output unit 84. The sound output unit 84 is a member that outputs sound, and is, for example, a buzzer. The sound output unit 84 outputs an alarm sound when, for example, an abnormality occurs in the ozone generator 100.

1-2. Effect of embodiment 1

In embodiment 1, the young's modulus of the support portion 50 is lower than that of either of the 1 st dielectric 11 and the 2 nd dielectric 31. Therefore, even if the 1 st dielectric 11 or the 2 nd dielectric 31 vibrates, the portion supported by the support portion 50 is less susceptible to stress. Therefore, the 1 st dielectric 11 and the 2 nd dielectric 31 are not easily broken.

Since the 1 st dielectric 11 and the 2 nd dielectric 31 are cantilever-supported on the same side, the 1 st dielectric 11 and the 2 nd dielectric 31 can be opened at the other end side in the longitudinal direction. Therefore, the gas easily enters the discharge space DS formed between the 1 st dielectric 11 and the 2 nd dielectric 31, and as a result, the ozone generation efficiency can be improved.

The support portion 50 includes a spacer 51 disposed between the 1 st dielectric 11 and the 2 nd dielectric 31. Therefore, the interval between the 1 st dielectric 11 and the 2 nd dielectric 31 can be easily set by the spacer 51.

The support portion 50 has an extension portion 54 extending from the spacer portion 53 and disposed between the 1 st projection 22 and the 2 nd projection 42. Therefore, the 1 st terminal 12 and the 2 nd terminal 32 can be insulated more reliably.

Further, since the 3 rd connection portion 23 of the 1 st terminal 12 is bent and extended from the tip end of the 1 st protruding portion 22, the 1 st terminal 12 can be restrained from expanding in the protruding direction of the 1 st protruding portion 22. Further, since the 4 th connecting portion 43 of the 2 nd terminal 32 is bent and extended from the tip end of the 2 nd protruding portion 42, the expansion of the 2 nd terminal 32 in the protruding direction of the 2 nd protruding portion 42 can be suppressed.

The support portion 50 includes a holder 52 for holding the 1 st dielectric 11 and the 2 nd dielectric 31 with the spacer 51 interposed therebetween. Therefore, the spacing between the 1 st dielectric 11 and the 2 nd dielectric 31 can be kept constant by the spacers 51 and the holders 52 of the supporting portion 50.

The holder 52 is annular and surrounds the outer circumferences of the 1 st dielectric 11 and the 2 nd dielectric 31 sandwiching the spacer 51. Therefore, the 1 st dielectric 11 and the 2 nd dielectric 31 sandwiching the spacer 51 are inserted through the hole of the holder 52, and thus the assembly can be easily performed.

The holder 52 has a 1 st notch 58 in which notches are formed so as to expose the 1 st terminal 12 and the 2 nd terminal 32. Therefore, the 1 st terminal 12 and the 2 nd terminal 32 can be easily buried in the resin through the 1 st notch 58.

The holder 52 further includes a 2 nd notch portion 59 notched so as to expose the discharge space DS. Therefore, the outer peripheries of the 1 st dielectric 11 and the 2 nd dielectric 31 can be surrounded by the holder 52, and the gas is allowed to flow into the discharge space DS through the 2 nd notch 59. Therefore, the decrease in the inflow amount of the gas into the discharge space DS due to the disposition of the holder 52 can be suppressed.

The 1 st dielectric 11 and the 2 nd dielectric 31 are ceramics, and the support portion 50 is made of resin. Therefore, even when the 1 st dielectric 11 and the 2 nd dielectric 31 are formed of ceramic and the portion supported by the support portion 50 is subjected to stress when vibration is applied, breakage of the 1 st dielectric 11 and the 2 nd dielectric 31 can be suppressed.

The natural frequency Fn of the 1 st electrode 10 and the 2 nd electrode 30 is 200Hz or more. Therefore, in a situation where vibration is applied from the outside at the time of conveyance or the like, the vibration due to resonance can be suppressed to be small, and as a result, stress applied to the 1 st dielectric 11 and the 2 nd dielectric 31 at the time of vibration is small, and therefore, breakage is difficult.

The support 50 has a double-sided tape 55 for adhering the 1 st dielectric 11 and the 2 nd dielectric 31 to the spacer 51. Therefore, the 1 st dielectric 11 and the 2 nd dielectric 31 are easily bonded to the spacer 51.

The support portion 50 of the ozone generator 3 supports the 1 st dielectric 11 and the 2 nd dielectric 31 at one end side in the longitudinal direction in a cantilever manner, and the support portion 50 is held at a position outside the wall surface 1A of the flow path 1. The 1 st dielectric 11 and the 2 nd dielectric 31 of the ozone generator 3 are disposed so as to protrude inward from the wall surface 1A. Accordingly, the ozone generator 100 can concentrate the structure and wiring for fixing the ozone generator 3, compared with a double-support structure or a structure with staggered cantilever support, and therefore, the structure can be simplified.

In embodiment 1, a thermosetting resin (resin member 89) is provided between 1 st conductor portion 3X and 2 nd conductor portion 3Y, and insulates 1 st conductor portion 3X and 2 nd conductor portion 3Y. Accordingly, the 1 st conductor portion 3X and the 2 nd conductor portion 3Y are configured to extend from one end side of the 1 st dielectric 11 and the 2 nd dielectric 31, respectively, and thus the distance between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y is relatively short. However, since the 1 st conductor portion 3X and the 2 nd conductor portion 3Y are insulated by the thermosetting resin (the resin member 89) provided between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y, insulation between the 1 st conductor portion 3X and the 2 nd conductor portion 3Y can be ensured by the thermosetting resin (the resin member 89).

The ozone generator 3 includes a spacer 51, and the spacer 51 is a member different from the thermosetting resin (resin member 89) and is disposed between the 1 st dielectric 11 and the 2 nd dielectric 31. Therefore, the interval between the 1 st dielectric 11 and the 2 nd dielectric 31 can be easily set by the spacer 51, and the insulation between the 1 st dielectric 11 and the 2 nd dielectric 31 is ensured.

The spacer 51 further includes an extension portion 54 extending from the spacer 53 and disposed between the 1 st projection 22 and the 2 nd projection 42. Accordingly, insulation of the 1 st projection 22 and the 2 nd projection 42 can be ensured by the extension portion 54, and therefore, the 1 st terminal 12 and the 2 nd terminal 32 can be insulated more reliably.

Further, the spacer 51 includes a holder 52 for holding the 1 st dielectric 11 and the 2 nd dielectric 31 with the spacer 51 interposed therebetween, and a holding portion 70 for accommodating and holding at least a part of the holder 52. Therefore, the 1 st dielectric 11 and the 2 nd dielectric 31 can be held at a constant interval by the spacers 51 and the holders 52, and the 1 st dielectric 11 and the 2 nd dielectric 31 are held by the holding portions 70.

The 1 st terminal 12 and the 2 nd terminal 32 are covered with a thermosetting resin (resin member 89) provided inside the 1 st notch 58. Therefore, the distance between the 1 st dielectric 11 and the 2 nd dielectric 31 can be kept constant by the spacers 51 and the holders 52, and the insulation properties of the 1 st terminal 12 and the 2 nd terminal 32 are ensured.

Then, the 1 st counterpart terminal 71 electrically connected to the 1 st terminal 12 and the 2 nd counterpart terminal 72 electrically connected to the 2 nd terminal 32 are surrounded by a thermosetting resin (resin member 89). Therefore, the 1 st counterpart terminal 71 and the 2 nd counterpart terminal 72 can be fixed by the thermosetting resin (resin member 89), and play of the 1 st counterpart terminal 71 and the 2 nd counterpart terminal 72 can be suppressed.

2. Embodiment 2

In embodiment 2, a preferred embodiment from the viewpoint of suppressing the consumption of the electrode of the ozone generator will be described. In embodiment 2, a more detailed configuration will be described on the premise of the configuration of embodiment 1.

2-1 Structure of ozone generator

As shown in fig. 14, the 1 st dielectric 11 has a 1 st surface 11X opposed to the 2 nd dielectric 31. The 2 nd dielectric 31 has a 2 nd surface 31X opposite to the 1 st surface 11X. A discharge space DS is formed between the 1 st surface 11X and the 2 nd surface 31X.

The fan 2 shown in fig. 2 and 3 is disposed upstream of the ozone generator 3, and rotates in a predetermined rotation direction, thereby generating a vortex in the rotation direction in the flow path 1. In the present embodiment, the predetermined rotation direction is clockwise when viewed from the exhaust port 6 side (the other end side in the Z direction). The ozone generator 3 is disposed on the wall surface 1A side of the flow path 1. The 1 st surface 11X of the 1 st dielectric 11 and the 2 nd surface 31X of the 2 nd dielectric 31 are inclined in the above-described predetermined rotation direction as going toward the downstream side. Therefore, the gas sent from the fan 2 easily enters the discharge space DS formed between the 1 st surface 11X and the 2 nd surface 31X. The 1 st surface 11X and the 2 nd surface 31X (which are formed between the 1 st dielectric 11 and the 2 nd dielectric 31 and are formed in the opening direction of the gas inlet port for introducing the gas sent from the fan 2) are preferably inclined at an angle of more than 0 ° and 80 ° or less, more preferably more than 0 ° and 50 ° or less, with respect to the Z direction (the central axis of the cylindrical flow path 1 in which the ozone generator 3 is disposed) in the rotation direction of the fan 2.

2-2 regarding the inter-dielectric gap GC and the inter-electrode distance GE

As shown in fig. 14, the inter-dielectric gap GC is a space between the 1 st dielectric 11 and the 2 nd dielectric 31 (specifically, a space between the 1 st surface 11X and the 2 nd surface 31X). The inter-dielectric gap GC was measured with reference to the positions of the other ends (tips) of the 1 st electrode 10 and the 2 nd electrode 30 in the longitudinal direction. As shown in fig. 14, the inter-electrode distance GE is the interval between the 1 st electrode 10 and the 2 nd electrode 30 (specifically, the interval between the other ends (tips) of the 1 st electrode 10 and the 2 nd electrode 30 in the longitudinal direction).

When D1 and D2 shown in fig. 14 are fixed, as the inter-dielectric gap GC increases, the inter-electrode distance GE also increases, and thus the voltage required for discharge also increases. If the voltage required for discharge increases, electromagnetic noise due to discharge may increase, and a transformer for boosting may increase in size. In order to solve such a problem, it is considered to reduce the inter-dielectric gap GC, but if the inter-dielectric gap GC is reduced, there is a concern that ozone generated in the discharge space DS is difficult to be emitted from the discharge space DS. In addition, it is considered that ozone is easily emitted from the discharge space DS by increasing the air volume to be sent from the fan 2 to the discharge space DS, but in this case, there are other problems such as the noise generated by the fan 2 becoming large and the power consumption of the fan 2 becoming large. Accordingly, the inventors have conducted experiments in order to study the appropriate inter-dielectric gap GC and inter-electrode distance GE.

The experimental conditions are as follows. For the ozone generator 3 applied voltage 20kHz frequency, VPP (Voltage peak to peak) is 4.5kV rectangular wave, duty ratio ("communication time and applied to the ozone generator 3 cycle ratio") is 20%. The length of each of the 1 st dielectric 11 and the 2 nd dielectric 31 in the longitudinal direction was 31mm, the length of each of the 1 st dielectric in the short direction was 10mm, and the thickness was 1.3mm. D1 and D2 shown in fig. 14 are each 0.15mm. The material of the 1 st dielectric 11 and the 2 nd dielectric 31 is aluminum oxide.

The length LE of the portion where the discharge was generated of the 1 st electrode 10 and the 2 nd electrode 30 shown in FIG. 14 was set to 10mm. The width WE of the 1 st electrode 10 and the 2 nd electrode 30 shown in fig. 6 is 0.6mm. The material of the 1 st electrode 10 and the 2 nd electrode 30 is tungsten (W). The 1 st electrode 10 and the 2 nd electrode 30 are formed in the pattern shown in fig. 15. As shown in fig. 15, the 1 st electrode 10 and the 2 nd electrode 30 have a 1 st straight portion 291, a 2 nd straight portion 292, an orthogonal portion 293, and an intersecting portion 294. The 1 st and 2 nd linear portions 291, 292 extend in the longitudinal direction and are arranged side by side in the short direction. The perpendicular portion 293 extends in a direction perpendicular to the 1 st and 2 nd linear portions 291, 292 and connects the 1 st and 2 nd linear portions 291, 292. The plurality of orthogonal portions 293 are provided at equal intervals in the longitudinal direction of the 1 st and 2 nd linear portions 291, 292. The intersecting portion 294 alternately connects an intersection P1 of the 1 st straight portion 291 and the orthogonal portion 293 and an intersection P2 of the 2 nd straight portion 292 and the orthogonal portion 293 from one end side toward the other end side in the longitudinal direction. The line width depicting the pattern of the 1 st electrode 10 and the 2 nd electrode 30 is 0.1mm.

For a rectangular wave with an applied voltage of 24V and 20kHz to the fan 2, the duty ratio ("the ratio of the on-time of the PWM signal applied to the fan 2") is 30%. The wind speed of the fan 2 was 2.3m/s.

The ozone generator 3 is disposed in an experimental flow path, not shown, having a diameter of 100 mm. An experimental hand guard, not shown, was placed on the outlet side of the experimental flow path, and a position 150mm from the center of the experimental hand guard was set as a position to be measured for ozone concentration. Ozone concentration was measured by a measuring device (ozone measuring device, model EG-3000F, manufactured by Emula industries Co., ltd.).

Noise was measured by experiments based on the CISPR14-1 standard.

In this experiment, the dielectric gap GC is set to 0.10mm, 0.15mm, 0.20mm, 0.25mm, 0.37mm, 0.50mm, 0.60mm, 0.80mm, 1.00mm ozone concentration measurement. Further, noises were measured when the inter-electrode distance GE was set to 0.40mm, 0.45mm, 0.50mm, 0.55mm, 0.67mm, 0.80mm, 0.90mm, 1.10mm, 1.30 mm.

The measurement results of the ozone concentration are shown in fig. 16. The measurement result of noise is shown in fig. 17. The comprehensive evaluation of ozone concentration and noise is shown in fig. 18.

Evaluation is as follows.

< ozone concentration (ppb) >)

"×" … … is less than 30 or 50 (50 or more is regarded as "×" in consideration of adverse effects due to high ozone concentration)

"good" … … is not less than 35

"verygood" … … is more than 35 and less than 40

"four arms" … … are more than 50 and less than 40

Noise (dB) >, noise (dB) >

"×" … … or more

Not less than "O" … … and less than 30

"verygood" … … is more than or less than 29

"" four of … … is smaller than 28

< comprehensive evaluation >)

The evaluation of at least one of the ozone concentration and noise of "x" … … was "x"

The evaluation of "o" … … was not "x" in the evaluation of ozone concentration and noise, and the evaluation of at least one was "o"

The "very good" … … was evaluated as "very good" in that the ozone concentration and noise were evaluated without "x", "o", and at least one of them was evaluated as "no"

Evaluation of both ozone concentration and noise of "four-star" … … was "four-star"

As is clear from the evaluation results shown in FIG. 16, the inter-dielectric gap GC is preferably 0.15mm or more, more preferably 0.20mm or more, and still more preferably 0.25mm or more. With this configuration, gas easily flows into the discharge space DS, and gas easily exits from the discharge space DS. Accordingly, ozone can be efficiently generated in the discharge space DS, and the generated ozone can be discharged from the discharge space DS.

Further, as is clear from the evaluation results shown in FIG. 17, the inter-electrode distance GE is preferably 1.1mm or less, more preferably 0.90mm or less, and still more preferably 0.80mm or less. With this configuration, the dielectric barrier discharge can be generated in the discharge space DS while suppressing the generation of electromagnetic noise due to the discharge, and ozone can be generated from oxygen.

Further, as is clear from the evaluation results shown in fig. 18, it is preferable that the inter-dielectric gap GC is 0.15mm or more and the inter-electrode distance GE is 1.1mm or less, more preferable that the inter-dielectric gap GC is 0.20mm or more and the inter-electrode distance GE is 0.90mm or less, and still more preferable that the inter-dielectric gap GC is 0.25mm or more and the inter-electrode distance GE is 0.80mm or less. With this configuration, the generation of electromagnetic noise due to discharge can be suppressed, ozone can be efficiently generated, and the generated ozone can be discharged from the discharge space DS.

2-3 effects of embodiment 2

The ozone generator 3 of embodiment 2 includes the 1 st electrode 10, the 1 st dielectric 11 covering the 1 st electrode 10, the 2 nd electrode 30, and the 2 nd dielectric 31 covering the 2 nd electrode 30. The ozone generator 3 generates a dielectric barrier discharge in the discharge space DS formed between the 1 st dielectric 11 and the 2 nd dielectric 31. Thus, ozone can be generated from oxygen in the discharge space DS. Further, since the 1 st electrode 10 is covered with the 1 st dielectric 11 and the 2 nd electrode 30 is covered with the 2 nd dielectric 31, the consumption due to oxidation of the 1 st electrode 10 and the 2 nd electrode 30 can be suppressed.

The ozone generator 3 further includes a support portion 50 that supports the 1 st dielectric 11 and the 2 nd dielectric 31 at one end side in the longitudinal direction of the 1 st dielectric 11 and the 2 nd dielectric 31 in a cantilever manner. Thus, since the 1 st dielectric 11 and the 2 nd dielectric 31 are cantilever-supported on the same side, the 1 st dielectric 11 and the 2 nd dielectric 31 can be opened at the other end side in the longitudinal direction. Therefore, the gas easily enters the discharge space DS formed between the 1 st dielectric 11 and the 2 nd dielectric 31, and as a result, the ozone generation efficiency can be improved.

The ozone generator 100 according to embodiment 1 includes a gas flow path 1, a fan 2 for feeding gas from the inlet 5 side to the outlet 6 side of the flow path 1, and an ozone generator 3. The fan 2 is disposed upstream of the ozone generator 3, and rotates in a predetermined rotational direction, thereby generating a vortex in the rotational direction in the flow path 1. The ozone generator 3 is disposed on the wall surface 1A side of the flow path 1. The 1 st surface 11X and the 2 nd surface 31X are arranged so as to incline in the rotation direction as going downstream. Thus, the gas sent from the fan 2 easily enters the discharge space DS formed between the 1 st surface 11X and the 2 nd surface 31X, and therefore, the efficiency of generating ozone by the ozone generator 3 can be improved. Further, since the 1 st surface 11X and the 2 nd surface 31X are inclined toward the downstream side, ultraviolet rays generated by the dielectric barrier discharge can be suppressed from entering the eyes of the person looking into the flow path 1 from the exhaust port 6 side.

3. Embodiment 3

In embodiment 3, a preferred embodiment from the viewpoint of easy air access between electrodes will be described. In embodiment 3, a more detailed configuration will be described on the premise of the configuration of embodiment 1.

As shown in fig. 19, the 1 st dielectric 11 has a 1 st surface 11X opposed to the 2 nd dielectric 31. The 2 nd dielectric 31 has a 2 nd surface 31X opposite to the 1 st surface 11X. A discharge space DS is formed between the 1 st surface 11X and the 2 nd surface 31X.

The inclination angle θ is an angle at which the 1 st surface 11X is inclined with respect to the 2 nd surface 31X when viewed from the short side direction, and the direction in which the 1 st surface 11X is close to the 2 nd surface 31X on the other end side in the long side direction is set to be positive, and the direction in which the 1 st surface 11X is close to the 2 nd surface 31X is set to be negative. That is, the inclination angle θ is 0 ° when the 1 st surface 11X and the 2 nd surface 31X are parallel, positive when the 1 st surface 11X and the 2 nd surface 31X are enlarged from one end side toward the other end side in the longitudinal direction, and negative when the 1 st surface 11X and the 2 nd surface 31X are narrowed from one end side toward the other end side in the longitudinal direction.

If the inclination angle θ is small, the voltage required for discharge can be suppressed, and therefore, the generation of electromagnetic noise due to discharge can be suppressed. However, there is a possibility that the gas is less likely to flow between the 1 st surface 11X and the 2 nd surface 31X and the ozone generated in the discharge space DS is less likely to be discharged from the discharge space DS. Conversely, if the inclination angle θ becomes large, gas easily flows between the 1 st surface 11X and the 2 nd surface 31X, and if D1 and D2 shown in fig. 5 are fixed, the voltage required for discharge also becomes large. If the voltage required for discharge increases, electromagnetic noise due to discharge may increase, and a transformer for boosting may increase in size. Accordingly, the inventors have conducted experiments to investigate the appropriate inclination angle θ from the viewpoint of discharging ozone generated in the discharge space DS and from the viewpoint of suppressing electromagnetic noise caused by discharge.

The experimental conditions are as follows. For the ozone generator 3 applied voltage 20kHz frequency, VPP (Voltage peak to peak) is 4.5kV rectangular wave, duty ratio ("communication time and applied to the ozone generator 3 cycle ratio") is 20%. The length of each of the 1 st dielectric 11 and the 2 nd dielectric 31 in the longitudinal direction was 31mm, the length of each of the 1 st dielectric in the short direction was 10mm, and the thickness was 1.3mm. Both D1 and D2 shown in FIG. 5 are 0.15mm. The material of the 1 st dielectric 11 and the 2 nd dielectric 31 is aluminum oxide.

The length LE (see fig. 5) of the portion where the discharge is generated of the 1 st electrode 10 and the 2 nd electrode 30 is 20mm when the inclination angle θ is 0 °. The width WE (see fig. 6) of the 1 st electrode 10 and the 2 nd electrode 30 is 0.6mm. The material of the 1 st electrode 10 and the 2 nd electrode 30 is tungsten (W). The 1 st electrode 10 and the 2 nd electrode 30 are formed in the pattern shown in fig. 15 described in embodiment 2.

Noise was measured by experiments based on the CISPR14-1 standard.

In this experiment, the concentration of ozone and noise were measured when tan θ×100 was set to-1.8 [% ], -1.0[% ], -0.5[% ], 0.0[% ], 0.5[% ], 1.0[% ], 3.0[% ], 3.6[% ].

As shown in fig. 19, the inclination angle θ is adjusted by disposing an adjustment member 96 between the 1 st dielectric 11 and the 2 nd dielectric 31. The thickness of the adjustment member 96 on the other end side in the longitudinal direction was set to be 0.37mm, and the thickness on the one end side was changed. Specifically, the thickness of one end side of the adjustment member 96 is adjusted by adjusting the height of the 1 st dielectric 11 side surface of the adjustment member 96. The 1 st dielectric 11 is disposed obliquely by a step formed in the adjustment member 96, and is kept in an oblique state. Thus, the 1 st surface 11X is inclined with respect to the 2 nd surface 31X.

tan θ is obtained from the expression (HA 2-HA 1)/LA. HA1 is the shortest distance from the intersection PA of the line passing through the other end of the adjustment member 96 in the longitudinal direction and orthogonal to the 2 nd surface 31X and the 1 st surface 11X to the 2 nd surface 31X. HA2 is the shortest distance from the other end of the 1 st surface 11X in the longitudinal direction to the 2 nd surface 31X. LA is a distance from the intersection PA to the other end of the 1 st surface 11X in the longitudinal direction of the 2 nd surface 31X.

The measurement results of ozone concentration and noise are shown in fig. 20.

Evaluation is as follows.

< ozone concentration (ppb) >)

"good" … … is not less than 35 and not more than 30

"verygood" … … is greater than 35 and less than 40

"four arms" … … are more than 50 and less than 40

Noise (dB) >, noise (dB) >

"×" … … or more

Not less than "O" … … and less than 30

"verygood" … … is more than or less than 29

"" four of … … is smaller than 28

< comprehensive evaluation >)

As is clear from the evaluation results shown in fig. 20, from the viewpoints that dielectric barrier discharge is generated while suppressing the generation of electromagnetic noise due to discharge, and that it is difficult to flow gas into the discharge space DS and that ozone generated in the discharge space DS is difficult to be discharged, tan θ×100 is preferably-1.8 [% ] or more and 3.0[% ] or less.

In particular, from the viewpoint of more reliably suppressing the difficulty of gas flowing into the discharge space DS and the difficulty of ozone generated in the discharge space DS from being discharged, tan θ×100 is more preferably-1.0 [% ] or more, and still more preferably-0.5 [% ] or more.

Further, from the viewpoint of more reliably suppressing the generation of electromagnetic noise due to discharge, tan θ×100 is more preferably 1.0[% ] or less, and still more preferably 0.5[% ] or less.

Further, from the viewpoint of importance attached to suppressing the generation of electromagnetic noise due to discharge and suppressing the difficulty of gas flowing into the discharge space DS and the difficulty of ozone generated in the discharge space DS from being discharged, tan θ×100 is preferably-1.8 [% ] or more and less than 0.0[% ], more preferably-1.0 [% ] or more and less than 0.0[% ], still more preferably-0.5 [% ] or more and less than 0.0[% ].

Further, from the viewpoint of paying attention to the easiness of inflow of gas into the discharge space DS and the easiness of discharge of ozone generated in the discharge space DS and suppressing the generation of electromagnetic noise due to discharge, tan θ×100 is preferably greater than 0.0[% ] and 3.0[% ] or less, more preferably greater than 0.0[% ] and 1.0[% ] or less, and still more preferably greater than 0.0[% ] and 0.5[% ] or less.

4. Embodiment 4

In embodiment 4, a preferred embodiment from the viewpoint of dispersing the ozone concentration in the vicinity of the exhaust port of the flow path will be described. In embodiment 4, the structure of embodiment 1 is assumed, and a more detailed structure will be described.

4-1 details about diffusion plate

Preferably, the material of the diffusion plate 66 has ozone resistance, for example, ABS resin. As shown in fig. 21, the diffusion plate 66 is disposed at a position covering the opening 90 formed between the 1 st dielectric 11 and the 2 nd dielectric 31 when viewed from the exhaust port 6 side.

The 2 nd flow path 8 corresponds to an example of a "straight flow path", and extends straight from the exhaust port 6 to the upstream side as shown in fig. 22. The 2 nd flow path 8 extends cylindrically along the Z direction. The ozone generator 3 is provided in the 2 nd flow path 8.

As shown in fig. 23, the 1 st dielectric 11 has a 1 st surface 11X facing the 2 nd dielectric 31 and forming a discharge space DS with the 2 nd dielectric 31. The 2 nd dielectric 31 has a 2 nd surface 31X opposed to the 1 st surface 11X and forming a discharge space DS with the 1 st surface 11X. The 1 st surface 11X and the 2 nd surface 31X are disposed obliquely with respect to the extending direction of the 2 nd flow path 8. The 1 st surface 11X and the 2 nd surface 31X are the same in size and shape, and specifically rectangular. An opening 90 is formed between the 1 st face 11X and the 2 nd face 31X.

The opening 90 has a 1 st opening 90A, a 2 nd opening 90B, and a 3 rd opening 90C. The 1 st opening 90A is formed between an end on the upstream side of the 1 st surface 11X and an end on the upstream side of the 2 nd surface 31X. The 2 nd opening 90B is formed between the end on the downstream side of the 1 st surface 11X and the end on the downstream side of the 2 nd surface 31X. The 3 rd opening 90C is formed between the end portion on the other end side in the longitudinal direction of the 1 st surface 11X and the end portion on the other end side in the longitudinal direction of the 2 nd surface 31X.

As shown in fig. 21, the 1 st opening 90A and the 3 rd opening 90C are each arranged at an angle that is not visible even if not covered by the diffusion plate 66 when viewed from the exhaust port 6 side to the Z direction. The 2 nd opening 90B is opened to the exhaust port 6 side. That is, only the 2 nd opening 90B of the openings 90 is opened to the exhaust port 6 side. As shown in fig. 21, the diffusion plate 66 is disposed at a position covering the 2 nd opening 90B when viewed from the exhaust port 6 side in the Z direction. That is, the diffusion plate 66 is disposed at a position covering the 2 nd opening 90B formed between the 1 st surface 11X and the 2 nd surface 31X and opened to the exhaust port 6 side when viewed from the exhaust port 6 side in the Z direction.

As shown in fig. 21, the diffusion plate 66 protrudes inward toward the center from a part of the wall surface 1A of the flow path 1 in the circumferential direction, and the circumferential width decreases as the wall surface 1A is separated. The angle of the distal end side of the diffusion plate 66 as viewed from the Z direction is, for example, 15 ° or more and 45 ° or less, and 30 ° in the example shown in fig. 21.

Further, the fan 2 rotates in the rotation direction W shown in fig. 21, and thereby generates a vortex in the rotation direction W in the flow path 1. As shown in fig. 22 and 23, the 1 st surface 11X and the 2 nd surface 31X incline in the rotation direction W toward the exhaust port 6 side (downstream side). As shown in fig. 14, the diffusion plate 66 is disposed on the 1 st virtual line VL1 which virtually extends the 1 st surface 11X and on the 2 nd virtual line VL2 which virtually extends the 2 nd surface 31X, when viewed from the X direction orthogonal to the extending direction (Z direction) of the 2 nd flow path 8. In the present embodiment, the X direction is the same direction as the longitudinal direction of the 1 st dielectric 11 and the 2 nd dielectric 31, and is the same direction as the protruding direction of the 1 st dielectric 11 and the 2 nd dielectric 31.

As shown in fig. 23, when viewed from the X direction, the center C1 of the diffusion plate 66 is disposed so as to be offset from the center C2 of the ozone generator 3 in the rotation direction W in the Y direction orthogonal to the X direction and the extending direction of the 2 nd flow path 8. Further, in the diffusion plate 66, when viewed from the X direction, the rear end 66A of the diffusion plate 66 in the rotation direction W is disposed at a position that coincides with the center C2 of the ozone generator 3 in the Y direction.

As shown in fig. 22, the 2 nd flow path 8 has a tapered surface 8B inclined so as to increase the cross-sectional area of the downstream flow path 1 on the downstream side of the diffusion plate 66. Specifically, the 2 nd flow path 8 has a cylindrical surface 8A and a tapered surface 8B connected to the downstream end of the cylindrical surface 8A. The cylindrical surface 8A has a constant diameter in the extending direction of the 2 nd flow path 8. The tapered surface 8B gradually increases in diameter toward the exhaust port 6.

As shown in fig. 3, the diffusion plate 66 protrudes inward from a part of the wall surface 1A of the flow path 1 in the circumferential direction, and the thickness thereof gradually decreases as it becomes farther from the wall surface 1A. That is, the diffusion plate 66 protrudes from the wall surface 1A toward the center, and gradually becomes smaller in thickness toward the tip end side. The thickness of the diffusion plate 66 is, for example, about 1mm on the tip side (center side) in a range of 2mm to 3mm on the wall surface 1A side.

4-2. Effect of embodiment 4

The diffusion plate 66 is disposed downstream of the ozone generator 3 in the flow path 1. Thus, the ozone generated by the ozone generator 3 is diffused by the diffusion plate 66 disposed further downstream, and thus the concentration of ozone in the vicinity of the exhaust port 6 of the flow path 1 can be dispersed.

The diffusion plate 66 is disposed at a position covering the opening 90 formed between the 1 st dielectric 11 and the 2 nd dielectric 31 when viewed from the exhaust port 6 side. Thus, since the opening 90 is covered with the diffusion plate 66, ultraviolet rays of the dielectric barrier discharge generated in the discharge space DS can be suppressed from entering the eyes of the person looking from the exhaust port 6 side.

The 1 st surface 11X and the 2 nd surface 31X facing each other are disposed obliquely with respect to the extending direction of the 2 nd flow path 8. Thus, since the 1 st surface 11X and the 2 nd surface 31X facing each other are disposed obliquely with respect to the extending direction of the 2 nd flow path 8, ultraviolet rays of the dielectric barrier discharge generated in the discharge space DS can be suppressed from entering the eyes of the person looking from the exhaust port 6 side.

The fan 2 generates a vortex in the flow path 1. The diffusion plate 66 protrudes inward from a part of the wall surface 1A of the flow path 1 in the circumferential direction, and the width in the circumferential direction decreases as the wall surface 1A is separated. For the velocity of the gas of the vortex, the further from the rotational axis of the vortex the velocity is faster and the closer to the rotational axis the velocity is slower. According to this configuration, the diffusion can be performed in a large range at a position far from the rotation axis where the movement speed of the gas is high, and in a small range at a position near to the rotation axis where the movement speed of the gas is low, and therefore, the ozone in the gas can be uniformly diffused while suppressing the pressure loss due to the diffusion plate 66.

Then, the fan 2 rotates in the rotation direction W, thereby generating a vortex in the rotation direction W in the flow path 1. The ozone generator 3 is disposed on the wall surface 1A side of the flow path 1. The 1 st surface 11X and the 2 nd surface 31X incline in the rotation direction W as going toward the exhaust port 6 side. The diffusion plate 66 is disposed on a 1 st virtual line VL1 that virtually extends the 1 st surface 11X and is disposed on a 2 nd virtual line VL2 that virtually extends the 2 nd surface 31X when viewed from the X direction. This allows the gas sent from the fan 2 to smoothly flow into the discharge space DS, ozone to be generated in the discharge space DS, and the gas including ozone discharged from the discharge space DS can be diffused more reliably by the diffusion plate 66.

The diffusion plate 66 protrudes from a part of the wall surface 1A of the flow path 1 in the circumferential direction, and when viewed from the X direction, the center C1 of the diffusion plate 66 is disposed so as to be offset from the center C2 of the ozone generator 3 in the rotation direction W in the Y direction. Therefore, ozone generated by the ozone generator 3 can be uniformly diffused to both sides of the diffusion plate 66.

Further, in the diffusion plate 66, when viewed from the X direction, the rear end 66A of the diffusion plate 66 in the rotation direction W is disposed at a position that coincides with the center C2 of the ozone generator 3 in the Y direction. Therefore, the ozone generated by the ozone generator 3 can be uniformly diffused to both sides of the diffusion plate 66 while suppressing the pressure loss caused by the diffusion plate 66.

The ozone generator 100 further includes a finger guard 64 provided downstream of the diffusion plate 66 and having a plurality of holes formed therein. Therefore, it is possible to allow the gas to be exhausted, and to suppress foreign matter from the outside from entering the upstream side of the finger guard 64.

The flow path 1 has a tapered surface 8B on the downstream side of the diffusion plate 66 so that the cross-sectional area of the flow path 1 increases toward the downstream side. Accordingly, the ozone diffused by the diffusion plate 66 can be further diffused in the tapered surface 8B.

The diffusion plate 66 protrudes inward from a part of the wall surface 1A of the flow path 1 in the circumferential direction, and the thickness thereof decreases as it is away from the wall surface 1A. Therefore, diffusion of ozone generated by the ozone generator 3 and suppression of pressure loss due to the diffusion plate 66 can be achieved in a balanced manner.

The ozone generator 3 is disposed so as to be offset toward the wall surface 1A side from the center of the flow path 1. This allows the ozone generator 3 to be disposed at a position offset toward the wall surface 1A, and thus the degree of freedom in design is high. Further, even if the ozone generator 3 is disposed at a position biased toward the wall surface 1A, the concentration distribution of ozone can be easily dispersed by the above configuration.

5. Embodiment 5

In embodiment 5, a preferred embodiment from the viewpoint of improving ozone generation efficiency will be described. Embodiment 5 is different from embodiment 1 in that it does not have a diffusion plate. Other structures are the same as those of embodiment 1, and detailed description thereof is omitted.

5-1 Structure of ozone generator

Fig. 24 and 25 show an ozone generator 500 according to embodiment 5. The fan 2 is a device that generates an air flow (specifically, a vortex flow) in the flow path 1, and is an axial flow fan in this embodiment. The fan 2 generates a vortex flow around a central axis L (see fig. 26) in the flow path 1. The fan 2 performs a blowing operation for feeding air from the air inlet 5 side to the air outlet 6 side of the flow path. The fan 2 includes a rotor 2A, a plurality of blades 2B protruding radially from the rotor 2A, and a motor (not shown). The fan 2 is driven by the motor by supplying electric power, and performs a blowing operation. The fan 2 is provided in the flow path 1 (specifically, the 2 nd flow path 8). The fan 2 is disposed with the central axis L (see fig. 26) of the fan 2 oriented in the Z direction. The fan 2 rotates in the Z direction as an axial direction. Specifically, the fan 2 rotates clockwise when viewed from the other end side (upper end side in fig. 26) in the axial direction.

As shown in fig. 26, the 1 st dielectric 11 is disposed on the fan 2 side with respect to the 2 nd dielectric 31 in the flow path structure portion 60. The ozone generator 3 is provided with a gas inlet 3A. The gas inlet 3A is an opening for allowing a gas (air containing oxygen) to enter the discharge space DS. The gas inlet 3A forms a part of the discharge space DS. The gas inlet 3A is configured to include an end 11A (end different from one end and the other end) of the 1 st dielectric 11 and an end 31A of the 2 nd dielectric 31 opposing the end 11A of the 1 st dielectric 11. The end 11A of the 1 st dielectric 11 and the end 31A of the 2 nd dielectric 31 are different from the ends in the longitudinal direction, and are ends in the direction orthogonal to the longitudinal direction and the parallel direction. The gas introduction port 3A extends along the extending direction (longitudinal direction) of the 1 st electrode 10 and the 2 nd electrode 30. The gas inlet 3A is provided mainly in the 1 st dielectric 11 and the 2 nd dielectric 31 at a portion on the other end side of the spacer 51 (more specifically, the spacer 53).

As shown in fig. 26, the direction in which the gas enters from the gas inlet 3A (hereinafter, also referred to as the opening direction) is inclined with respect to the central axis L in the rotation direction of the fan 2. The "opening direction" is a direction orthogonal to the direction in which the 1 st dielectric 11 and the 2 nd dielectric 31 are aligned with respect to the extending direction (longitudinal direction) of the 1 st electrode 10 and the 2 nd electrode 30. The opening direction is a direction orthogonal to the region sandwiched between the end 11A of the 1 st dielectric 11 and the end 31A of the 2 nd dielectric 31. The opening direction is along the gap (discharge space DS) between the 1 st dielectric 11 and the 2 nd dielectric 31. For example, as shown in fig. 26, the cross section (the cross section in which the central axis L of the fan 2 and the ozone generator 3 appear to overlap) viewed from the extending direction (longitudinal direction) of the 1 st electrode 10 and the 2 nd electrode 30 is directed upward to the right (the direction of arrow A1 in fig. 26). The "rotational direction of the fan 2" means a clockwise direction when viewed from the other end side (upper end side in fig. 26) in the axial direction. For example, the "rotational direction of the fan 2" refers to a direction in which the right blade (blade 2 BX) rotates toward the front side of the paper and the left blade (blade 2 BY) rotates toward the back side of the paper in the cross section shown in fig. 26.

The vortex generated by the fan 2 is a flow rotating clockwise when viewed from the other end side (upper side) in the Z direction. For example, in the cross section shown in fig. 26, as indicated by an arrow A3, an air flow directed upward to the right is generated in the flow path 1. Therefore, by configuring the opening direction of the gas inlet 3A to be inclined with respect to the central axis L in the rotation direction of the fan 2, the direction in which the vortex flow is directed and the opening direction of the gas inlet 3A are easily overlapped. Thus, the gas is easily introduced from the gas inlet 3A into the discharge space DS, and the ozone generating efficiency of the ozone generator 3 can be improved.

For example, an inclination angle (also simply referred to as an inclination angle) of the opening direction of the gas introduction port 3A with respect to the central axis L in the rotation direction of the fan 2 is preferably greater than 0 ° and 80 ° or less. Preferably, the inclination angle of the opening direction of the gas inlet 3A is, for example, 50 ° or less.

As shown in fig. 25, the entirety of the 1 st dielectric 11 including the other end in the longitudinal direction (hereinafter referred to as the other end 11B) and the entirety of the 2 nd dielectric 31 including the other end in the longitudinal direction (hereinafter referred to as the other end 31B) are located radially outward of the rotor 2A when viewed from the Z direction (up-down direction). The phrase "the 1 st dielectric 11 and the 2 nd dielectric 31 are located radially outward of the rotor 2A" means that the entirety of the 1 st dielectric 11 including the other end in the longitudinal direction of the 1 st dielectric 11 and the entirety of the 2 nd dielectric 31 including the other end in the longitudinal direction of the 2 nd dielectric 31 do not exceed (not pass over) the rotor 2A when viewed from the Z direction (up-down direction). That is, the 1 st dielectric 11 and the 2 nd dielectric 31 do not overlap with the rotor 2A of the fan 2 in the Z direction (up-down direction). The 1 st dielectric 11 and the 2 nd dielectric 31 are located at positions overlapping the blade portions 2B of the fan 2 in the Z direction (up-down direction). Therefore, the gas inlet 3A can be inclined in the rotation direction of the fan 2 with respect to the central axis L as a whole, and the swirl flow can easily enter the gas inlet 3A. Further, since the flow is faster as the vortex is farther from the central axis L, the vortex is likely to enter the gas introduction port 3A located on the wall surface 1A side. Further, since the discharge space DS is located at the wall surface 1A side, ozone generation is efficiently performed by the vortex flow flowing in from the gas introduction port 3A.

As shown in fig. 26, the ozone generator 3 is provided with a gas outlet 3B. The gas discharge port 3B discharges the gas introduced from the gas introduction port 3A. The gas discharge port 3B constitutes a part of the discharge space DS. The gas discharge port 3B is provided on the opposite side of the gas introduction port 3A. The gas discharge port 3B has the same structure as the gas introduction port 3A. The gas discharge port 3B is configured to include an end 11C of the 1 st dielectric 11 (an end on the opposite side to the end 11A) and an end 31C of the 2 nd dielectric 31 opposed to the end 11A of the 1 st dielectric 11. As shown in fig. 26, the flow path structure portion 60 is located in a direction in which the gas is discharged from the gas discharge port 3B (also referred to as a discharge direction). In the present embodiment, the "discharge direction" means the same direction as the opening direction of the gas introduction port 3A. The discharge direction is a direction orthogonal to the region sandwiched between the end 11C of the 1 st dielectric 11 and the end 31C of the 2 nd dielectric 31. For example, in the cross section shown in fig. 26, the direction is upward to the right (the direction of arrow A4 in fig. 26). As shown in fig. 26, the flow path structure portion 60 is located in the discharge direction of the gas discharge port 3B (on a straight line extending from the gas discharge port 3B), and it is difficult to recognize the gas discharge port 3B from the side view of the gas discharge port 6. Therefore, it is difficult to visually recognize the discharge space DS through the gas discharge port 3B, and ultraviolet rays generated during direct-view discharge can be suppressed.

As shown in fig. 13 described in embodiment 1, the ozone generator 500 includes a control unit 80, an operation unit 81, an ozone detecting unit 82, a display unit 83, and a sound output unit 84. The control unit 80 controls the operation of the ozone generator 500. The control unit 80 is composed mainly of a microcomputer, and includes CPU, ROM, RAM, a driving circuit, and the like.

The operation unit 81 is a switch that switches on/off state by pressing, for example, a tact switch. A signal indicating the operation result of the operation unit 81 is input to the control unit 80. The ozone detecting unit 82 detects the ozone concentration of the air outside the ozone generator 500. A signal indicating the detection value of the ozone detecting section 82 is input to the control section 80.

The control unit 80 can control the operation of the audio output unit 84. The sound output unit 84 is a member that outputs sound, and is, for example, a buzzer. The sound output unit 84 outputs an alarm sound when, for example, an abnormality occurs in the ozone generator 500.

5-2 effects of embodiment 5

In embodiment 5, the direction in which the gas enters from the gas inlet 3A (opening direction) is inclined with respect to the central axis L in the rotation direction of the fan 2, so that the gas is easily introduced from the gas inlet 3A into the discharge space DS. Accordingly, the ozone generating efficiency of the ozone generator 500 is improved.

The 1 st dielectric 11 and the 2 nd dielectric 31 are located radially outward of the rotor 2A. Therefore, the gas inlet 3A can be inclined in the rotation direction of the fan 2 with respect to the central axis L as a whole, and the swirl flow can easily enter the gas inlet 3A.

The flow path structure 60 is located in the direction (discharge direction) in which the gas is discharged from the gas discharge port 3B. Therefore, it is difficult to visually recognize the discharge space DS from the exhaust port 6 side of the flow path 1 via the gas discharge port 3B, and direct viewing of ultraviolet rays can be suppressed.

Further, a straight line X extending toward the gas discharge port 3B through the 1 st edge 10A of the 1 st electrode 10 and the 2 nd edge 31D of the 2 nd dielectric 31 intersects the flow path structure 60. Therefore, it is difficult to visually recognize the vicinity of the 1 st electrode 10 from the exhaust port 6 side of the flow path 1 via the gas discharge port 3B, and direct viewing of ultraviolet light generated in the vicinity of the 1 st electrode 10 can be suppressed.

6. Embodiment 6

Fig. 27 is a diagram illustrating a part of the ozone generator according to embodiment 6. Embodiment 6 differs from embodiment 5 mainly in the angle of assembly of ozone generator 3 with respect to flow channel 1. Other structures are the same as those of embodiment 5, and detailed description thereof is omitted.

As shown in fig. 27, the 1 st electrode 10 has the 1 st edge 10A on the gas discharge port 3B side, and the 2 nd dielectric 31 has the 2 nd edge 31D on the gas discharge port 3B side. A straight line X extending toward the gas discharge port 3B through the 1 st edge 10A and the 2 nd edge 31D intersects the flow path structure 60. In fig. 25, the straight line X is illustrated as passing through a predetermined position of the 1 st edge portion 10A, but it is preferable that the straight line X intersect with the flow path structure portion 60 even at other positions (other positions in the longitudinal direction) passing through the 1 st edge portion 10A. Similarly, it is preferable that the straight line X intersect the flow path structure portion 60 even at other positions (other positions in the longitudinal direction) passing through the 2 nd edge portion 31D. With the above configuration, it is difficult to visually recognize the 1 st electrode 10 on the 1 st electrode 10 side from the exhaust port 6 side of the flow path 1 via the gas discharge port 3B. Therefore, direct viewing of ultraviolet light generated between the electrodes can be suppressed.

7. Embodiment 7

Fig. 28 is a diagram illustrating a part of the ozone generator according to embodiment 7. Embodiment 7 differs from embodiment 5 mainly in that the ozone generator has a diffusion plate. Other structures are the same as those of embodiment 5, and detailed description thereof is omitted.

As shown in fig. 28, the ozone generator 700 of embodiment 7 has a diffusion plate 766. The diffusion plate 766 corresponds to an example of a "shielding portion" of the present disclosure. The diffusion plate 766 diffuses ozone generated by the ozone generator 3 in the flow path 1. Preferably, the diffusion plate 766 is made of an ABS resin, for example, having ozone resistance. The diffusion plate 766 is disposed downstream of the ozone generator 3 in the flow path 1. The diffusion plate 766 protrudes inward from the wall surface 1A of the flow path 1. The diffusion plate 766 protrudes from a part of the wall surface 1A in the circumferential direction. The width of the diffusion plate 766 becomes smaller as it is away from the wall surface 1A. The diffusion plate 766 has a fan shape. The diffusion plate 766 is integrally formed with the flow path structure portion 60 (specifically, the 1 st division body 60A (see fig. 25)). The diffusion plate 766 is disposed at a position overlapping the ozone generator 3 (specifically, a part of the ozone generator 3 on the gas discharge port 3B side) when viewed in the axial direction (for example, the other end side in the Z direction) from the central axis L. More specifically, the diffusion plate 766 overlaps the gas discharge port 3B as viewed in the axial direction from the central axis L. This makes it difficult to visually recognize the ozone generator 3 from the exhaust port 6 side of the flow path 1 through the gas discharge port 3B.

As shown in fig. 28, the diffusion plate 766 protrudes inward toward the center from a part of the wall surface 1A of the flow path 1 in the circumferential direction, and the circumferential width becomes smaller as it is away from the wall surface 1A. The angle of the distal end side of the diffusion plate 766 viewed from the Z direction is, for example, 15 ° or more and 45 ° or less, and 30 ° in the example shown in fig. 28. The diffusion plate 766 protrudes from the wall surface 1A toward the center, and gradually decreases in thickness toward the tip end side. The thickness of the diffusion plate 766 is, for example, about 1mm on the tip side (center side) in a range of 2mm to 3mm on the wall surface 1A side.

The opening direction of the gas introduction port 3A may be determined as follows. The inclination angle of the vortex flow generated by the rotation of the fan 2 with respect to the central axis L is set as the vortex flow angle. The swirl angle can be measured by the method shown in fig. 29, for example. Fig. 29 is a schematic view schematically showing a cylinder as the flow path 1 (specifically, the 2 nd flow path 8). The swirling flow is generated by the air blowing operation of the fan 2, and the smoke tube is burned from the lower end side of the cylinder, and as shown in fig. 29, the direction of the swirling flow is determined from the trace S of smoke or the like remaining on the wall surface (corresponding to the surface of the wall surface 1A). For example, a straight line X2 along one edge of the trajectory S of the smoke is determined. The angle θx of the straight line X2 with respect to the straight line X3 extending in the up-down direction is measured and set as the vortex angle. The angle θx is measured, for example, in a state where the cylinder is spread out on a plane. Preferably, the swirl angle θx is, for example, 20 °.

An angle obtained by adding an angle within a range of-30 DEG to 30 DEG is set as an addition angle. More preferably, the addition angle is an angle in the range of-10 ° or more and 10 ° or less. The direction in which the gas enters from the gas inlet 3A (opening direction) is inclined at an added angle to the central axis L in the rotation direction of the fan 2. In this way, the opening direction of the gas inlet 3A is inclined at an angle close to the swirl angle, so that the swirl flow is likely to enter the gas inlet 3A. Thus, the diffusion plate 766 makes it difficult to visually recognize the ozone generator 3, and the gas is easily introduced into the discharge space DS from the gas inlet 3A, thereby improving the ozone generation efficiency.

< other embodiments >

The present invention is not limited to the embodiments described above and illustrated in the drawings, and, for example, the following embodiments are included in the technical scope of the present invention. The various features of the above-described embodiment and the embodiments described below may be combined in any combination as long as they are not contradictory.

In embodiments 1 to 7, the Z direction is the up-down direction, but is not limited to the up-down direction. For example, the Z direction may be a direction inclined with respect to the up-down direction.

In the above embodiments 1 to 4, the support portion has a structure in which the 1 st dielectric and the 2 nd dielectric are supported by a cantilever, but may have a double-support structure.

In the above embodiments 1 to 4, the support portion is configured to support the 1 st dielectric and the 2 nd dielectric on the same side cantilever, but may not be configured to support the same side cantilever, and may be configured to support end portions of opposite sides cantilever alternately, for example.

In the above embodiments 5 to 7, the opening direction of the gas inlet 3A and the direction of the gas outlet 3B are the same, but may be different.

In the above embodiments 5 to 7, the gas inlet 3A is constituted by one opening region, but may be constituted by a plurality of divided opening regions.

The embodiments disclosed herein are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is not limited to the embodiments disclosed herein, but is intended to include all modifications within the scope indicated by the claims or the scope equivalent to the claims.

(additionally remembered)

The present invention can include the following aspects.

(additionally, 1)

[1] The ozone generator of the present invention comprises: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; and a 2 nd dielectric covering the 2 nd electrode. The ozone generator further has a support portion for supporting the 1 st dielectric and the 2 nd dielectric. A discharge space is formed between the 1 st dielectric and the 2 nd dielectric. The Young's modulus of the support portion is lower than that of either of the 1 st dielectric and the 2 nd dielectric.

[2] The support portion may be configured to support the 1 st dielectric and the 2 nd dielectric by cantilever at one end side in an orthogonal direction orthogonal to the direction in which the 1 st dielectric and the 2 nd dielectric are aligned.

[4] The ozone generator may include: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal may have: a 1 st connection part electrically connected to the 1 st electrode; and a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward one end side from an end portion of the 1 st dielectric. The 2 nd terminal may have: a 2 nd connection part electrically connected to the 2 nd electrode; and a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion. The spacer may be an insulating member, and the spacer may include: a spacer disposed between the 1 st dielectric and the 2 nd dielectric; and an extension portion extending from the spacer portion and disposed between the 1 st protruding portion and the 2 nd protruding portion.

[5] The ozone generator may include: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal may have: a 1 st connection part electrically connected to the 1 st electrode; a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward one end side from an end portion of the 1 st dielectric; and a 3 rd connection portion bent and extended from the tip of the 1 st protrusion portion. The 2 nd terminal may have: a 2 nd connection part electrically connected to the 2 nd electrode; a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion; and a 4 th connecting portion bent and extended from a tip end of the 2 nd protruding portion.

[7] The holder may have a ring shape surrounding the outer circumferences of the 1 st dielectric and the 2 nd dielectric sandwiching the spacer.

According to such a configuration, the 1 st dielectric and the 2 nd dielectric sandwiching the spacer are inserted through the hole of the holder, and thus the assembly can be easily performed.

[8] The ozone generator may include: a 1 st terminal electrically connected to the 1 st electrode; and a 2 nd terminal electrically connected to the 2 nd electrode. The 1 st terminal may be disposed on the side opposite to the spacer side of the 1 st dielectric, and the 2 nd terminal may be disposed on the side opposite to the spacer side of the 2 nd dielectric. The holder may have a notch portion in which a notch is formed so as to expose the 1 st terminal and the 2 nd terminal.

[9] The holder may have a 2 nd notch portion in which a notch is formed so as to expose the discharge space.

[10] The 1 st dielectric and the 2 nd dielectric may be ceramics. The support portion may be made of resin.

According to such a structure, the 1 st dielectric and the 2 nd dielectric are formed of ceramic, and even when the portion supported by the support portion is subjected to stress when vibration is applied, breakage of the 1 st dielectric and the 2 nd dielectric can be suppressed.

[11] The natural frequency of the 1 st dielectric and the 2 nd dielectric may be 200Hz or more.

According to such a configuration, in a situation where vibration is applied from the outside at the time of conveyance or the like, the vibration due to resonance can be suppressed to be small, and as a result, stress applied to the 1 st dielectric and the 2 nd dielectric at the time of vibration is small, and therefore breakage is difficult.

[12] The support portion may have a double-sided tape for adhering the 1 st dielectric and the 2 nd dielectric to the spacer.

According to such a structure, the 1 st dielectric and the 2 nd dielectric are easily bonded to the spacer.

[13] The invention relates to an ozone generator comprising a gas flow path, a fan and any one of [1] to [12 ]. The fan sends air from the air inlet side to the air outlet side of the flow path. The ozone generator generates ozone in the flow path using air sucked from the air inlet as a raw material.

According to the structure, can be applied to the [1] to [12] any ozone generator.

[14] The support portion of the ozone generator may cantilever-support the 1 st dielectric and the 2 nd dielectric on one end side in an orthogonal direction orthogonal to the direction in which the 1 st dielectric and the 2 nd dielectric are aligned, and the support portion may be held at a position outside the wall surface of the flow path. The 1 st dielectric and the 2 nd dielectric of the ozone generator may be disposed so as to protrude inward from the wall surface.

(additionally remembered 2)

[1] The ozone generating unit of the invention comprises: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; a 2 nd dielectric covering the 2 nd electrode, a discharge space being provided between the 1 st dielectric and the 2 nd electrode; a 1 st conductor portion electrically connected to the 1 st electrode and extending from one end side of the 1 st dielectric in an orthogonal direction orthogonal to the direction in which the 1 st dielectric and the 2 nd dielectric are aligned; and a 2 nd conductor portion electrically connected to the 2 nd electrode and extending from one end side of the 2 nd dielectric in the orthogonal direction. A thermosetting resin is provided between the 1 st conductor portion and the 2 nd conductor portion to insulate the 1 st conductor portion and the 2 nd conductor portion.

According to such a configuration, since the 1 st conductor portion and the 2 nd conductor portion are configured to extend from one end sides of the 1 st dielectric and the 2 nd dielectric, respectively, the distance between the 1 st conductor portion and the 2 nd conductor portion is relatively short. However, since the 1 st conductor portion and the 2 nd conductor portion are insulated by the thermosetting resin provided between the 1 st conductor portion and the 2 nd conductor portion, the insulation between the 1 st conductor portion and the 2 nd conductor portion can be ensured by the thermosetting resin.

[2] The insulating member may be provided with a different thermosetting resin than the thermosetting resin provided between the 1 st conductor portion and the 2 nd conductor portion, and may be disposed between the 1 st dielectric and the 2 nd dielectric.

According to such a structure, the interval between the 1 st dielectric and the 2 nd dielectric can be easily set by the insulating member, and the insulation between the 1 st dielectric and the 2 nd dielectric is ensured.

[3] The 1 st conductor part may have a 1 st terminal electrically connected to the 1 st electrode, the 2 nd conductor part may have a 2 nd terminal electrically connected to the 2 nd electrode, and the 1 st terminal may include: a 1 st connection part electrically connected to the 1 st electrode; and a 1 st protruding portion connected to the 1 st connecting portion, the 1 st terminal protruding toward one end side from an end portion of the 1 st dielectric, the 2 nd terminal having: a 2 nd connection part electrically connected to the 2 nd electrode; and a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion. The insulating member may have: a spacer disposed between the 1 st dielectric and the 2 nd dielectric; and an extension portion extending from the spacer portion and disposed between the 1 st protruding portion and the 2 nd protruding portion.

According to this configuration, the insulation between the 1 st projection and the 2 nd projection can be ensured by the extension portion, and therefore, the 1 st terminal and the 2 nd terminal can be insulated more reliably.

[4] The present invention may be provided with: a holder for holding the 1 st dielectric and the 2 nd dielectric sandwiching the insulating member; and a holding portion that accommodates and holds at least a portion of the holder.

According to such a configuration, the 1 st dielectric and the 2 nd dielectric can be held at a constant interval by the insulating member and the holder, and the 1 st dielectric and the 2 nd dielectric can be held by the holder.

[5] The 1 st conductor portion may have a 1 st terminal, and the 1 st terminal may have a 1 st connection portion electrically connected to the 1 st electrode. The 2 nd conductor portion may have a 2 nd terminal, and the 2 nd terminal may have a 2 nd connection portion electrically connected to the 2 nd electrode. The 1 st terminal may be disposed on the side opposite to the insulating member side of the 1 st dielectric, and the 2 nd terminal may be disposed on the side opposite to the insulating member side of the 2 nd dielectric. The holder may have a notch portion in which a notch is formed so as to expose the 1 st terminal and the 2 nd terminal. The 1 st terminal and the 2 nd terminal may be covered with a thermosetting resin provided inside the notch.

According to such a configuration, the insulation member and the holder can maintain the interval between the 1 st dielectric and the 2 nd dielectric constant, and ensure the insulation properties of the 1 st terminal and the 2 nd terminal.

[6] The holder may have a 2 nd notch portion in which a notch is formed so as to expose the discharge space.

[7] The 1 st conductor part may have a 1 st terminal electrically connected to the 1 st electrode and a 1 st wiring electrically connected to the 1 st terminal, and the 2 nd conductor part may have a 2 nd terminal electrically connected to the 2 nd electrode and a 2 nd wiring electrically connected to the 2 nd terminal. The 1 st conductor part may have a 1 st wiring electrically connected to the 1 st terminal, and the 2 nd conductor part may have a 2 nd wiring electrically connected to the 2 nd terminal. The 1 st wiring and the 2 nd wiring may be surrounded by a thermosetting resin.

According to this structure, the 1 st wiring and the 2 nd wiring can be fixed by the thermosetting resin, and the play of the 1 st wiring and the 2 nd wiring can be suppressed.

[8] The ozone generator of the present invention comprises the ozone generating unit described in any one of [1] to [7], a gas flow path, and a fan that sends gas from a gas inlet side to a gas outlet side of the flow path, wherein the ozone generating unit generates ozone in the flow path using air sucked from the gas inlet as a raw material.

According to the structure, can be applied to the above [1] to [7] any ozone generating unit applied to an ozone generator.

(additionally, the recording 3)

[1] The ozone generator of the present invention comprises: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; and a 2 nd dielectric covering the 2 nd electrode. The ozone generator of the present invention causes dielectric barrier discharge to be generated in a discharge space formed between the 1 st dielectric and the 2 nd dielectric.

According to this structure, by generating dielectric barrier discharge in the discharge space, ozone can be generated from oxygen. Further, since the 1 st electrode is covered with the 1 st dielectric and the 2 nd electrode is covered with the 2 nd dielectric, consumption due to oxidation of the 1 st electrode and the 2 nd electrode can be suppressed.

[2] The ozone generator of the present invention may have a support portion that supports the 1 st dielectric and the 2 nd dielectric by cantilever at one end side in an orthogonal direction orthogonal to the direction in which the 1 st dielectric and the 2 nd dielectric are aligned.

According to this structure, the 1 st dielectric and the 2 nd dielectric are supported by the cantilever on the same side, and therefore, the 1 st dielectric and the 2 nd dielectric can be opened at the other end side in the orthogonal direction. Therefore, the gas easily enters the discharge space formed between the 1 st dielectric and the 2 nd dielectric, and as a result, the ozone generation efficiency can be improved.

[3] The inter-dielectric gap, which is the gap between the 1 st dielectric and the 2 nd dielectric, may be 0.15mm or more.

According to such a configuration, gas easily flows into the discharge space, and gas easily exits from the discharge space.

[4] The inter-dielectric gap, which is the gap between the 1 st dielectric and the 2 nd dielectric, may be 0.20mm or more.

According to this structure, the gas is further easily flowed into the discharge space, and the gas is easily discharged from the discharge space.

[5] The inter-dielectric gap, which is the gap between the 1 st dielectric and the 2 nd dielectric, may be 0.25mm or more.

[6] The inter-electrode distance, which is the distance between the 1 st electrode and the 2 nd electrode, may be 1.1mm or less.

According to this structure, the generation of electromagnetic noise due to discharge can be suppressed, dielectric barrier discharge can be generated in the discharge space, and ozone can be generated from oxygen.

[7] The inter-electrode distance, which is the distance between the 1 st electrode and the 2 nd electrode, may be 0.90mm or less.

According to this structure, the generation of electromagnetic noise due to discharge can be further suppressed, dielectric barrier discharge can be generated in the discharge space, and ozone can be generated from oxygen.

[8] The inter-electrode distance, which is the distance between the 1 st electrode and the 2 nd electrode, may be 0.80mm or less.

[9] The ozone generator of the present invention comprises: a flow path for the gas; a fan that sends air from the air inlet side to the air outlet side of the flow path; and the ozone generator of any one of [1] to [8 ]. The ozone generator generates ozone in the flow path using air sucked from the air inlet as a raw material.

According to this structure, the ozone generator can be applied to an ozone generator.

[10] The fan may be disposed upstream of the ozone generator, and may rotate in a predetermined rotation direction to generate a vortex in the rotation direction in the flow path. The 1 st dielectric of the ozone generator may have a 1 st surface facing the 2 nd dielectric and forming a discharge space between the 2 nd dielectric and the 1 st surface. The 2 nd dielectric of the ozone generator may have a 2 nd surface opposite to the 1 st surface. The ozone generator may be disposed on the wall surface side of the flow path. The 1 st and 2 nd surfaces may be arranged so as to incline in the rotation direction as going toward the downstream side.

According to this structure, the air sent from the fan easily enters the discharge space formed between the 1 st surface and the 2 nd surface, so that the ozone generating efficiency of the ozone generator can be improved. Further, since the 1 st surface and the 2 nd surface are inclined toward the downstream side, ultraviolet rays generated by the dielectric barrier discharge can be suppressed from entering the eyes of a person looking into the flow path from the exhaust port side.

(additionally remembered 4)

[1] The ozone generator of the present invention comprises: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; and a 2 nd dielectric covering the 2 nd electrode. A discharge space is formed between the 1 st dielectric and the 2 nd dielectric. The ozone generator of the present invention further includes a support portion for cantilever-supporting the 1 st dielectric and the 2 nd dielectric on one end side in an orthogonal direction orthogonal to the direction in which the 1 st dielectric and the 2 nd dielectric are aligned. The 1 st dielectric has a 1 st surface facing the 2 nd dielectric and forming the discharge space between the 2 nd dielectric and the 1 st surface. The 2 nd dielectric has a 2 nd face opposite to the 1 st face. The inclination angle θ of the 1 st surface with respect to the 2 nd surface satisfies the following formula (I) when the direction of the 1 st surface away from the 2 nd surface on the other end side in the orthogonal direction is positive,

[2] The inclination angle θ may satisfy the following formula (II).

-1.0[% ] is less than or equal to tan θ×100 … … formula (II)

According to this configuration, the opening of the other end side of the ozone generator in the orthogonal direction is reduced, and thus the gas is less likely to flow into the discharge space and the ozone generated in the discharge space is less likely to be discharged.

[3] The inclination angle θ may satisfy the following formula (III).

-0.5[% ] is equal to or less than tan θ×100 … … (III)

[4] The inclination angle θ may satisfy the following formula (IV).

tan theta x 100 is less than or equal to 1.0[% ] … … type (IV)

According to this structure, the occurrence of electromagnetic noise due to discharge can be more reliably suppressed due to the increase in the opening of the ozone generator at the other end side in the orthogonal direction.

[5] The inclination angle θ may satisfy the following expression (V).

tan theta x 100 is less than or equal to 0.5[% ] … … type (V)

[6] The ozone generator of the present invention comprises: a flow path for the gas; a fan that sends air from the air inlet side to the air outlet side of the flow path; and the ozone generator of any one of [1] to [5 ]. The ozone generator generates ozone in the flow path using air sucked from the air inlet as a raw material.

[7] The fan may be disposed upstream of the ozone generator, and may rotate in a predetermined rotation direction to generate a vortex in the rotation direction in the flow path. The 1 st dielectric of the ozone generator may have a 1 st surface facing the 2 nd dielectric and forming a discharge space between the 2 nd dielectric and the 1 st surface. The 2 nd dielectric of the ozone generator may have a 2 nd surface opposite to the 1 st surface. The ozone generator may be disposed on the wall surface side of the flow path. The 1 st and 2 nd surfaces may be arranged so as to incline in the rotation direction as going toward the downstream side.

(additionally noted 5)

[1] The ozone generator of the present invention has a gas flow path, a fan, an ozone generator, and a diffusion plate. The fan sends air from the air inlet side to the air outlet side of the flow path. The ozone generator is provided in the flow path, and generates ozone in the flow path. The diffusion plate is disposed downstream of the ozone generator in the flow path.

[2] The ozone generator may include: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; and a 2 nd dielectric covering the 2 nd electrode. A discharge space may be formed between the 1 st dielectric and the 2 nd dielectric. The diffusion plate may be disposed at a position covering an opening formed between the 1 st dielectric and the 2 nd dielectric when viewed from the exhaust port side.

According to this configuration, since the opening is covered with the diffusion plate, ultraviolet rays of the dielectric barrier discharge generated in the discharge space can be suppressed from entering the eyes of the person looking from the exhaust port side.

[3] The flow path may have a straight flow path extending straight from the exhaust port to the upstream side. The ozone generator may be provided in a straight flow path. The ozone generator may include: 1 st electrode; a 1 st dielectric covering the 1 st electrode; a 2 nd electrode; and a 2 nd dielectric covering the 2 nd electrode. The 1 st dielectric may have a 1 st surface facing the 2 nd dielectric and forming a discharge space with the 2 nd dielectric. The 2 nd dielectric may have a 2 nd surface opposite to the 1 st surface. The 1 st surface and the 2 nd surface may be disposed obliquely with respect to the extending direction of the straight flow path.

According to this configuration, since the 1 st surface and the 2 nd surface facing each other are disposed obliquely with respect to the extending direction of the straight flow path, ultraviolet rays of the dielectric barrier discharge generated in the discharge space can be suppressed from entering the eyes of the person looking from the exhaust port side.

[4] The ozone generator may have a fan that generates a vortex in the flow path. The diffusion plate may protrude inward from a part of the wall surface of the flow path in the circumferential direction, and may have a width that decreases in the circumferential direction as the diffusion plate is separated from the wall surface.

For the velocity of the gas of the vortex, the further from the rotational axis of the vortex the velocity is faster and the closer to the rotational axis the velocity is slower. According to the above configuration, diffusion can be performed in a large range at a position far from the rotation axis where the movement speed of the gas is high, and diffusion can be performed in a small range at a position near to the rotation axis where the movement speed of the gas is low, so that the ozone in the gas can be uniformly diffused while suppressing the pressure loss caused by the diffusion plate.

[5] The ozone generator may have a fan that generates a vortex in a predetermined rotation direction in the flow path by rotating in the rotation direction. The ozone generator may be disposed on the wall surface side of the flow path. The 1 st and 2 nd surfaces may be inclined in the rotation direction as they face the exhaust port side. The diffusion plate may be disposed on a 1 st virtual line that virtually extends the 1 st surface and on a 2 nd virtual line that virtually extends the 2 nd surface when viewed from an X direction orthogonal to the extending direction of the linear flow path.

According to this configuration, the gas sent from the fan can smoothly flow into the discharge space, ozone is generated in the discharge space, and the gas including ozone discharged from the discharge space can be diffused more reliably by the diffusion plate.

[6] The diffusion plate may protrude from a part of the wall surface of the flow path in the circumferential direction, and the center of the diffusion plate may be disposed so as to be offset from the center of the ozone generator in the rotational direction in the Y direction orthogonal to the extending direction of the straight flow path and the X direction when viewed from the X direction.

With this configuration, ozone generated by the ozone generator can be uniformly diffused to both sides of the diffusion plate.

[7] The diffusion plate may be arranged such that the rear end of the diffusion plate in the rotation direction coincides with the center of the ozone generator in the Y direction when viewed from the X direction.

With this configuration, ozone generated by the ozone generator can be uniformly diffused to both sides of the diffusion plate while suppressing pressure loss caused by the diffusion plate.

[8] The ozone generator may have a finger guard provided downstream of the diffusion plate and having a plurality of holes formed therein.

According to this structure, it is possible to allow the gas to be exhausted and to suppress foreign matter from outside from entering the upstream side of the finger guard.

[9] The flow path may have a tapered surface on the downstream side of the diffusion plate, the tapered surface being inclined so that the cross-sectional area of the flow path increases toward the downstream side.

According to this structure, ozone diffused by the diffusion plate can be further diffused in the tapered surface.

[10] The diffusion plate may protrude inward from a part of the wall surface of the flow path in the circumferential direction, and may have a thickness that decreases as the diffusion plate is away from the wall surface.

According to this structure, the diffusion of ozone generated by the ozone generator and the suppression of pressure loss by the diffusion plate can be realized in a balanced manner.

[11] The ozone generator may be disposed so as to be offset to the wall surface side from the center of the flow path.

According to this structure, the ozone generator can be arranged at a position deviated to the wall surface side, so that the degree of freedom in design is high. Further, even if the ozone generator is disposed at a position deviated to the wall surface side, the concentration distribution of ozone is easily dispersed according to the above configuration.

(additionally described 6)

[1] The ozone generator of the present invention comprises: a flow path structure part provided with a flow path for gas inside; an axial flow fan that generates a vortex flow around a central axis in a flow path, and sends gas from a suction port side to an exhaust port side of the flow path; and an ozone generator having a 1 st electrode, a 1 st dielectric, a 2 nd electrode, and a 2 nd dielectric, wherein the 1 st dielectric covers the 1 st electrode, the 2 nd dielectric covers the 2 nd electrode, wherein one end of the 1 st dielectric and one end of the 2 nd dielectric are supported by the flow path structure portion, and the other end of the 1 st dielectric and the other end of the 2 nd dielectric are separated from an inner wall surface of the flow path structure portion, and a discharge space is provided between the 1 st dielectric and the 2 nd dielectric. The gas inlet is configured to include an end portion of the 1 st dielectric different from one end and the other end, and an end portion of the 2 nd dielectric opposite to the end portion of the 1 st dielectric. The direction of the gas entering from the gas inlet is inclined relative to the rotation direction of the axial flow fan along the central axis.

[2] The axial flow fan may have a rotor and a blade portion protruding radially from the rotor. The 1 st dielectric and the 2 nd dielectric may be located radially outward of the rotor.

According to this configuration, the gas inlet is inclined with respect to the rotation direction of the axial flow fan with respect to the central axis, and the vortex flow can easily enter the gas inlet.

[3] The ozone generator may have a gas outlet provided on the side opposite to the gas inlet and configured to discharge the gas introduced from the gas inlet. The flow path structure may be located in a direction in which the gas is discharged from the gas discharge port.

With this configuration, it is difficult to visually recognize the discharge space from the exhaust port side of the flow path through the gas discharge port, and direct viewing of ultraviolet rays can be suppressed.

[4] The 1 st dielectric may be disposed on the axial flow fan side with respect to the 2 nd dielectric. When the 1 st electrode has the 1 st edge and the 2 nd dielectric has the 2 nd edge, a straight line extending through the 1 st edge and the 2 nd edge toward the gas outlet may intersect with the flow path structure.

With this configuration, it is difficult to visually recognize the vicinity of the 1 st electrode from the exhaust port side of the flow path through the gas discharge port, and it is possible to suppress direct viewing of ultraviolet light generated in the vicinity of the 1 st electrode.

[5] The ozone generator may further include a shielding portion provided on the exhaust port side of the ozone generator. At least a part of the shielding portion may overlap with the ozone generator when seen in the axial direction from the central axis.

With this configuration, it is possible to make it difficult to visually recognize the ozone generator from the exhaust port side of the flow path through the gas discharge port.

[6] The inclination angle of the vortex flow generated by the rotation of the axial flow fan with respect to the central axis may be a vortex angle, and the angle obtained by adding an angle in the range of-30 ° or more and 30 ° or less to the vortex angle may be an addition angle, and the direction in which the gas enters from the gas inlet may be inclined with respect to the central axis in the rotation direction of the axial flow fan at the addition angle.

According to this configuration, it is possible to improve the ozone generating efficiency by making it difficult to visually recognize the ozone generating body by the shielding portion and by making it easy to introduce the gas into the discharge space through the gas introduction port.

[7] The ozone generator may have a gas outlet provided on the side opposite to the gas inlet and configured to discharge the gas introduced from the gas inlet. The shielding portion may overlap the gas discharge port when seen in the axial direction from the central axis.

With this configuration, it is difficult to recognize the gas discharge port from the side view of the gas discharge port of the flow path, and the direct view of ultraviolet rays can be suppressed.

Description of the reference numerals

1. A flow path; 1A, wall surface; 2. a fan (axial flow fan); 2A, a rotor; 2B, blade portions; 3. an ozone generator; 3B, 1 st conductor portion; 3C, the 2 nd conductor portion; 3U, ozone generating unit; 3X, a gas inlet; 3Y, gas outlet; 5. an air suction port; 6. an exhaust port; 8. a 2 nd flow path (straight flow path); 8B, a conical surface; 10. 1 st electrode; 10A, 1 st edge; 11. a 1 st dielectric; 11A, end; 11B, the other end; 11C, end; 11X, 1 st side; 12. a 1 st terminal; 21. a 1 st connection part; 22. a 1 st projection; 23. a 3 rd connection part; 30. a 2 nd electrode; 31. a 2 nd dielectric; 31A, end; 31B, the other end; 31C, end; 31D, the 2 nd edge; 31X, 2 nd surface; 32. a 2 nd terminal; 41. a 2 nd connecting part; 42. a 2 nd protrusion; 43. a 4 th connecting part; 50. a support section; 51. a spacer; 52. a holder; 53. a spacer; 54. an extension setting part; 55. double-sided tape; 58. 1 st notch portion (notch portion); 59. a 2 nd notch portion; 60. a flow path structure portion; 64. hand guard; 66. a diffusion plate; 66A, the rear end of the diffusion plate; 70. a holding section; 71. 1 st counterpart terminal (1 st wiring); 72. a 2 nd counterpart terminal (2 nd wiring); 89. a resin member; 90. an opening; 90A, 1 st opening; 90B, opening 2; 90C, 3 rd opening; 100. an ozone generator; 500. an ozone generator; 700. an ozone generator; 766. a diffusion plate; c1, the center of the diffusion plate; c2, the center of the ozone generator; DS, discharge space; GC. An inter-dielectric gap; GE. An inter-electrode distance; l, central axis; VL1, 1 st virtual line; VL2, 2 nd virtual line; w, the rotation direction; θ, inclination angle.

Claims

1. An ozone generator, wherein,

the ozone generator comprises:

1 st electrode;

a 1 st dielectric covering the 1 st electrode;

a 2 nd electrode;

a 2 nd dielectric covering the 2 nd electrode; and

a support portion that supports the 1 st dielectric and the 2 nd dielectric,

a discharge space is formed between the 1 st dielectric and the 2 nd dielectric,

the Young's modulus of the support portion is lower than that of either one of the 1 st dielectric and the 2 nd dielectric.

2. The ozone generator according to claim 1, wherein,

the support portion supports the 1 st dielectric and the 2 nd dielectric by cantilever at one end side in an orthogonal direction orthogonal to a direction in which the 1 st dielectric and the 2 nd dielectric are aligned.

3. The ozone generator according to claim 2, wherein,

the support portion has a spacer disposed between the 1 st dielectric and the 2 nd dielectric.

4. The ozone generator according to claim 3, wherein,

the ozone generator comprises:

a 1 st terminal electrically connected to the 1 st electrode; and

a 2 nd terminal electrically connected to the 2 nd electrode,

the 1 st terminal has: a 1 st connection part electrically connected to the 1 st electrode; and a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward the one end side than an end portion of the 1 st dielectric,

The 2 nd terminal has: a 2 nd connection part electrically connected to the 2 nd electrode; and a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion,

the spacer is an insulating member, and has: a spacer disposed between the 1 st dielectric and the 2 nd dielectric; and an extension portion extending from the spacer portion and disposed between the 1 st protruding portion and the 2 nd protruding portion.

5. The ozone generator according to claim 3 or 4, wherein,

the ozone generator comprises:

a 1 st terminal electrically connected to the 1 st electrode; and

a 2 nd terminal electrically connected to the 2 nd electrode,

the 1 st terminal has: a 1 st connection part electrically connected to the 1 st electrode; a 1 st protruding portion connected to the 1 st connecting portion, the 1 st protruding portion protruding toward the one end side than an end portion of the 1 st dielectric; and a 3 rd connection part bent and extended from the tip of the 1 st protrusion part,

the 2 nd terminal has: a 2 nd connection part electrically connected to the 2 nd electrode; a 2 nd protruding portion connected to the 2 nd connecting portion and protruding in the same direction as the 1 st protruding portion; and a 4 th connecting portion bent and extended from a tip end of the 2 nd protruding portion.

6. The ozone generator according to any one of claims 3 to 5, wherein,

the support portion has a holder for holding the 1 st dielectric and the 2 nd dielectric sandwiching the spacer.

7. The ozone generator according to claim 6, wherein,

the ozone generator comprises:

a 1 st terminal electrically connected to the 1 st electrode; and

a 2 nd terminal electrically connected to the 2 nd electrode,

the 1 st terminal is arranged on the side of the 1 st dielectric opposite to the spacer side,

the 2 nd terminal is arranged on the side of the 2 nd dielectric opposite to the spacer side,

the holder has a notch portion in which a notch is formed so as to expose the 1 st terminal and the 2 nd terminal.

8. The ozone generator according to claim 7, wherein,

the holder has a 2 nd notch portion in which a notch is formed in such a manner that the discharge space is exposed.

9. The ozone generator according to any one of claims 1 to 8, wherein,

an inter-dielectric gap, which is a gap between the 1 st dielectric and the 2 nd dielectric, is 0.15mm or more.

10. An ozone generating unit, wherein,

The ozone generating unit comprises:

the ozone generator of any one of claims 1 to 9; and

a thermosetting resin is used as the heat-curable resin,

the support portion of the ozone generator supports the 1 st dielectric and the 2 nd dielectric at one end side cantilever in an orthogonal direction orthogonal to a side-by-side direction of the 1 st dielectric and the 2 nd dielectric,

the ozone generator comprises:

a 1 st terminal electrically connected to the 1 st electrode; and

a 2 nd terminal electrically connected to the 2 nd electrode,

the thermosetting resin is provided between the 1 st projection and the 2 nd projection.

11. An ozone generator, wherein,

the ozone generator comprises:

a flow path for the gas;

a fan that sends gas from a suction port side to an exhaust port side of the flow path; and

The ozone generator according to any one of claim 1 to 9,

the ozone generator generates ozone in the flow path using air sucked from the air inlet as a raw material.

12. The ozone generator of claim 11, wherein,

the ozone generator support portion is configured to support the 1 st dielectric and the 2 nd dielectric by cantilever at one end side in an orthogonal direction orthogonal to a direction in which the 1 st dielectric and the 2 nd dielectric are aligned, and the support portion is held at a position outside a wall surface of the flow path,

the 1 st dielectric and the 2 nd dielectric of the ozone generator are disposed so as to protrude inward from the wall surface.

13. The ozone generator of claim 11 or 12, wherein,

the ozone generator comprises: a flow path structure portion provided with the flow path inside; and

an axial flow fan that generates a vortex flow around a central axis in the flow path, sends gas from a suction port side to an exhaust port side of the flow path,

in the ozone generator, one end of the 1 st dielectric and one end of the 2 nd dielectric are supported by the flow path structure part, and the other end of the 1 st dielectric and the other end of the 2 nd dielectric are separated from the inner wall surface of the flow path structure part, a discharge space is arranged between the 1 st dielectric and the 2 nd dielectric,

The gas inlet is configured to include an end portion of the 1 st dielectric different from the one end and the other end and an end portion of the 2 nd dielectric opposite to the end portion of the 1 st dielectric,

the direction in which the gas enters from the gas inlet is inclined with respect to the rotation direction of the axial flow fan with respect to the central axis.

14. The ozone generator of any one of claims 11 to 13, wherein,

the support portion supports the 1 st dielectric and the 2 nd dielectric by cantilever at one end side in an orthogonal direction orthogonal to a side-by-side direction of the 1 st dielectric and the 2 nd dielectric,

the 1 st dielectric has a 1 st face opposite to the 2 nd dielectric and forming the discharge space with the 2 nd dielectric,

the 2 nd dielectric has a 2 nd face opposite the 1 st face,

the inclination angle θ of the 1 st surface with respect to the 2 nd surface, when the direction of the 1 st surface away from the 2 nd surface on the other end side of the orthogonal direction is positive, satisfies the following formula (I),

15. An ozone generator, wherein,

the ozone generator comprises:

a flow path for the gas;

A fan that sends gas from a suction port side to an exhaust port side of the flow path;

the ozone generator according to any one of claims 1 to 9, which is provided in the flow path and generates ozone in the flow path; and

and a diffusion plate disposed downstream of the ozone generator in the flow path.