JP7463320B2 - Ozone Generator - Google Patents

Description

The present invention relates to an ozone generator.

Patent Document 1 discloses an ozone generating device (small air purifier). This device has a base and an air guide cover. Between the base and the air guide cover, an opening is formed to take in indoor air, and a filter is placed inside the opening.

Japanese Patent Application Laid-Open No. 07-323081

With this type of device, the inner filter is visible through the opening, which raises concerns about poor design.

The present invention provides technology that can prevent the design from being impaired by the filter being visible from the outside.

[1] The ozone generator of the present invention has an ozone generator that generates ozone, a flow path in which the ozone generator is provided, and a filter provided in the flow path. The flow path has an exhaust port, an intake port that is located outside the outer periphery of the exhaust port, a guide flow path that guides gas sucked in from the intake port to a position inside the inner periphery of the intake port, and an exhaust-side flow path that leads the gas guided by the guide flow path to the exhaust port. The filter is provided in the guide flow path.

With this configuration, the filter is placed in a guide flow path that guides the gas sucked in from the air intake port to the inside of the inner circumference of the air intake port, so the filter is not visible or is difficult to see from the air intake port. This makes it possible to prevent a loss of design quality due to the filter being visible from the outside.

[2] The air intake may be arranged in a ring shape outside the outer periphery of the exhaust port. The guide flow path may be arranged in a ring shape and guide the gas sucked in from the air intake to the inside of the inner periphery of the air intake. The filter may be arranged in a ring shape in the guide flow path.

With this configuration, gas can be drawn into the flow path from all around the ozone generator, and foreign matter in the drawn gas can be efficiently removed by the filter.

[3] The filter may be arranged along the intake direction of the air intake port.

This configuration makes the filter less visible from the air intake.

[4] The ozone generator may have a filter frame to which a filter is attached, a mounting section to which the filter frame is attached, an intake section having an intake port formed therein, and a mounting section to which the intake section is detachably attached. The intake section may prevent the filter frame from coming off the mounting section when attached to the mounting section, and may allow the filter frame to come off the mounting section when detached from the mounting section.

This configuration allows the filter frame to be attached and removed simply by removing the intake section, making the work of attaching and removing the filter frame easy.

[5] The mounting portion may have a mounting groove into which the filter frame fits. The filter frame may be attached to the mounting portion by fitting into the mounting groove.

This configuration makes it easy to attach and remove the filter frame from the mounting portion.

[6] The ozone generator may have a filter frame to which the filter is attached. The filter frame may have an annular frame body and a knob portion protruding outward from the outer peripheral surface of the frame body.

With this configuration, even if the inner circumferential surface of the frame body is adjacent to a component placed inside and difficult to grasp, it is easy to remove the component by grasping the knob portion protruding from the outer circumferential surface of the frame body.

[7] The filter may be configured to be divided into multiple divided filters in the circumferential direction.

This configuration makes it easy to install the filter.

[8] The ozone generator may have a filter frame having a mounting hole for mounting a filter. The air intake may be arranged along a ring outside the outer periphery of the exhaust port. The induction flow path may be arranged along a ring and may induce gas drawn in from the air intake to the inside of the inner periphery of the air intake. The filter may be arranged along a ring in the induction flow path. The opening width of the mounting hole in the axial direction of the air intake arranged along a ring may be larger than the opening width of the air intake in a direction perpendicular to the axial direction.

With this configuration, the collection area of the filter can be made larger than the opening area of the air intake, which reduces pressure loss caused by the filter while also preventing a decrease in the filter's ability to remove foreign matter.

The present invention makes it possible to prevent the design from being impaired by the filter being visible from the outside.

FIG. 1 is a perspective view of an ozone generator. 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 along a different plane than that of FIG. FIG. 4 is a perspective view of the ozone generator. FIG. 5 is a view of the ozone generator as viewed from the short side direction. FIG. 6 is a view of the ozone generators as viewed from the direction in which they are arranged. FIG. 7 is an exploded perspective view of the ozone generator. FIG. 8 is a perspective view showing a state before the holder for the ozone generator is attached. FIG. 9 is a cross-sectional view taken along line AA in FIG. FIG. 10 is a perspective view showing a state in which the ozone generator is held in the holder. FIG. 11 is a block diagram showing the electrical configuration of the ozone generator. FIG. 12 is an exploded perspective view of the flow passage configuration portion, the filter frame, the filter, and the intake portion. FIG. 13 is a bottom view of the ozone generator. FIG. 14 is a bottom view of the ozone generator with the intake section removed. FIG. 15 is a cross-sectional view of the mounting hole and the intake port of the filter frame.

1. First embodiment 1-1. Configuration of ozone generator 100 The ozone generator 100 shown in Fig. 1 is a device that draws in outside air, generates ozone from oxygen in the air by dielectric barrier discharge, and exhausts it to the outside. As shown in Figs. 2 and 3, the ozone generator 100 has 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 intake port 5 takes in gas (e.g., air) from outside the ozone generator 100 into the flow path 1. The exhaust port 6 exhausts the gas in the flow path 1 to the outside of the ozone generator 100. The flow path 1 exhausts the gas sucked in from the intake port 5 from the exhaust port 6.

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

The intake ports 5 are arranged along a ring shape (specifically, a circular ring shape) with the Z direction as the axial direction. The exhaust ports 6 are arranged inside the ring portion where the intake ports 5 are arranged. The exhaust ports 6 are arranged in a circular shape.

The flow path 1 has an induction flow path 7, an exhaust side flow path 8, and an intake side flow path 9. The intake side flow path 9 extends from the intake port 5 to the exhaust port 6 side. The intake side flow path 9 extends from the intake port 5 to the other end side in the Z direction (upward in this embodiment) and induces the gas sucked from the intake port 5 to the other end side in the Z direction (upward in this embodiment). The induction flow path 7 is connected to the downstream end of the intake side flow path 9 and induces the gas sucked from the intake port 5 arranged along the ring to the inside of the inner circumference of the intake port 5. The exhaust side flow path 8 extends from the downstream end of the induction flow path 7 toward the exhaust port 6 side to the other end side in the Z direction (upward in this embodiment). The downstream end of the exhaust side flow path 8 is connected to the exhaust port 6. The exhaust side flow passage 8 has an outer diameter smaller than the inner circumference of the intake port 5 arranged along a ring, and guides the gas guided inward by the guide flow passage 7 toward the exhaust port 6 (upward in this embodiment) and discharges it from the exhaust port 6. In this specification, "arranged along a ring" does not only mean a configuration in which the entirety is arranged in a ring, but also includes a configuration in which the entirety is arranged in a ring while being partially interrupted, and can also be simply said to be "arranged in a ring."

The fan 2 is a device that generates an airflow (specifically, a swirling flow) in the flow path 1, and in this embodiment is an axial fan. The fan 2 performs a blowing operation by sending gas from the intake port 5 side of the flow path 1 toward the exhaust port 6 side. The fan 2 has a motor. The fan 2 performs a blowing operation by driving the motor when power is supplied. The fan 2 is provided in the flow path 1 (specifically, the exhaust side flow path 8). The fan 2 is arranged with the axial direction of the fan 2 facing the Z direction. The fan 2 rotates with the Z direction as its axial direction.

The ozone generator 3 generates a dielectric barrier discharge by applying an AC voltage, and generates ozone in the flow path 1 using oxygen in the air sucked in from the air intake 5 as a raw material. As shown in Figures 4 to 7, the ozone generator 3 has a first electrode 10, a second electrode 30, a first dielectric 11, a second dielectric 31, a first terminal 12, a second terminal 32, and a support part 50.

The first electrode 10 and the second electrode 30 are made of metal, and in this embodiment, tungsten (W) is used as the material. The first electrode 10 and the second electrode 30 may be made of materials other than tungsten, such as molybdenum (Mo), silver (Ag), copper (Cu), and platinum (Pt). The first electrode 10 and the second electrode 30 are formed as thin metal layers and are long in a predetermined direction. The thickness of the first electrode 10 and the second electrode 30 (metal layer) is preferably 10 μm or more from the viewpoint of ensuring adhesion strength, and is preferably 50 μm or less from the viewpoint of suppressing peeling due to excessive thickness. The width and length of the first electrode 10 and the second electrode 30 are arbitrarily set according to the required amount of ozone generation. The width WE (see FIG. 6) of the first electrode 10 and the second electrode 30 is 1 mm. The length of the first electrode 10 and the second electrode 30 is set based on the length LE (see FIG. 5) of the portion where the support portion 50 does not exist between the first electrode 10 and the second electrode 30. The length LE is 10 mm.

In this embodiment, the first dielectric 11 and the second dielectric 31 are formed of alumina (Al ₂ O ₃ ). The first dielectric 11 and the second dielectric 31 are not limited to alumina, and may be formed of other ceramics such as glass (SiO ₂ ), aluminum nitride (AlN), yttrium oxide (Y ₂ O ₃ ), or a mixture thereof. The first dielectric 11 covers the first electrode 10, and the second dielectric 31 covers the second electrode 30. The first dielectric 11 and the second dielectric 31 are each plate-shaped.

The first dielectric 11 and the second dielectric 31 are arranged side by side in the thickness direction of the first dielectric 11 and the second dielectric 31. That is, the first dielectric 11 and the second dielectric 31 face each other in the thickness direction of the first dielectric 11 and the second dielectric 31. A discharge space DS is formed between the first dielectric 11 and the second dielectric 31. The surfaces facing each other are flat surfaces and have a rectangular shape. One of the surfaces facing each other extends along the other surface. One of the surfaces facing each other may or may not be parallel to the other surface. The thickness direction of the first electrode 10 and the second electrode 30 is the same as the thickness direction of the first dielectric 11 and the second dielectric 31. The arrangement direction of the first dielectric 11 and the second dielectric 31 is hereinafter referred to as the "arrangement direction".

The first electrode 10 is disposed in the first dielectric 11 at a position closer to the second electrode 30 in the arrangement direction. The second electrode 30 is disposed in the second dielectric 31 at a position closer to the first electrode 10 in the arrangement direction. The first electrode 10 and the second electrode 30 are disposed on the top surface of a thinly formed dielectric layer by printing or the like. A thicker dielectric layer is formed on top of this to produce the first dielectric 11 covering the first electrode 10 and the second dielectric 31 covering the second electrode 30.

The thickness of the first dielectric 11 on the discharge space DS side of the first electrode 10 (the distance between the face of the first electrode 10 on the discharge space DS side and the face of the first dielectric 11 on the discharge space DS side) is defined as D1 (see FIG. 5). The thickness of the second dielectric 31 on the discharge space DS side of the second electrode 30 (the distance between the face of the second electrode 30 on the discharge space DS side and the face of the second dielectric 31 on the discharge space DS side) is defined as D2 (see FIG. 5). In this case, the minimum value of D1+D2 can be calculated by the following formula (1).
(Minimum value of D1+D2)=(Voltage applied to ozone generator 3 [kV])/(Withstand voltage (kV/mm) of materials of first dielectric 11 and second dielectric 31)...Equation (1)
The withstand voltage of alumina is 15 kV/mm, and if the peak value of the high voltage AC voltage is 4.5 kV, the minimum value of D1+D2 is 0.3 mm.
On the other hand, if D1 and D2 are too thick, the loss in the first dielectric 11 and the second dielectric 31 increases, and the power efficiency decreases. Therefore, the maximum value of D1+D2 is about twice the minimum value of D1+D2. Specifically, D1+D2 is preferably 0.3 mm or more and 0.6 mm or less. In other words, D1 and D2 are preferably 0.15 mm or more and 0.3 mm or less, respectively. In this embodiment, D1 and D2 are each set to 0.15 mm in consideration of ease of manufacture.

The extension direction (longitudinal direction) of the first electrode 10 and the second electrode 30 is the same as the longitudinal direction (hereinafter simply referred to as the "longitudinal direction") of the first dielectric 11 and the second dielectric 31. The longitudinal direction corresponds to an example of an "orthogonal direction perpendicular to the arrangement direction of the first dielectric and the second dielectric." The short-side direction of the first dielectric 11 and the second dielectric 31 is hereinafter simply referred to as the "short-side direction."

The first dielectric 11 has a first dielectric body 13, a first protruding portion 14, and a first recess 15. The first dielectric body 13 is plate-shaped and has a rectangular parallelepiped shape. The first dielectric body 13 covers the first electrode 10. The first protruding portion 14 is formed in a form that protrudes to the outside of the first dielectric 11 (the side opposite to the second dielectric 31 side) at one end side in the longitudinal direction. The first protruding portion 14 is formed over the entire region in the short direction of the first dielectric 11. The first protruding portion 14 is formed up to one end of the first dielectric 11 in the longitudinal direction. The first recess 15 is formed on one end side in the longitudinal direction on the outer surface (the side opposite to the second dielectric 31 side) of the first dielectric 11. The first recess 15 is formed in a form in which the first protruding portion 14 is recessed. The first recess 15 opens at one end of the first dielectric 11 in the longitudinal direction.

The second dielectric 31 has a second dielectric body 33, a second protruding portion 34, and a second recess 35. The second dielectric body 33 is plate-shaped and has a rectangular parallelepiped shape. The second dielectric body 33 covers the second electrode 30. The second dielectric body 33 faces the first dielectric body 13 and forms a discharge space DS between the first dielectric body 13 and the second dielectric body 33. The second protruding portion 34 is formed in a shape that protrudes to the outside of the second dielectric 31 (opposite the first dielectric 11 side) at one end side in the longitudinal direction. The second protruding portion 34 is formed over the entire region in the short direction of the second dielectric 31. The second protruding portion 34 is formed up to one end of the second dielectric 31 in the longitudinal direction. The second recess 35 is formed on the outer surface (opposite the first dielectric 11 side) of the second dielectric 31 at one end side in the longitudinal direction. The second recess 35 is formed in a shape that the second protruding portion 34 is recessed. The second recess 35 opens at one end of the second dielectric 31 in the longitudinal direction.

Considering that the withstand voltage of air is about 3.0 kV/mm, the dielectric gap GC (see FIG. 5), which is the distance between the first dielectric 11 (specifically, the first dielectric body 13) and the second dielectric 31 (specifically, the second dielectric body 33), needs to be less than 1.5 mm in order to discharge when the peak value of the AC voltage applied to the ozone generator 3 is 4.5 kV. However, in order to extend the discharge time and maintain a stable discharge, it is preferable to set it to one-third or less, that is, 0.5 mm or less. On the other hand, if the dielectric gap GC becomes too small, the air supplied will be insufficient and the amount of ozone generated will decrease. For this reason, the dielectric gap GC is preferably 0.2 mm or more. For example, the dielectric gap GC is preferably 0.37 mm. In addition, when the opposing surfaces of the first dielectric 11 and the second dielectric 31 are not parallel to each other, the dielectric gap GC is based on the position of the tip (the other end in the longitudinal direction) of the first electrode 10 and the second electrode 30.

Ｋｎは、定数であり、第１誘電体１１及び第２誘電体３１が片持ち支持される構造である場合には１．８７５である。Ｅ［Ｐａ］は、第１誘電体１１及び第２誘電体３１のヤング率である。Ｅ［Ｐａ］は、第１誘電体１１及び第２誘電体３１がアルミナである場合、２８０ＧＰａ程度である。Ｉ［ｍ^４］は、第１誘電体１１及び第２誘電体３１の断面２次モーメントである。ρ［ｋｇ／ｍ^３］は、第１誘電体１１及び第２誘電体３１の密度である。Ａ［ｍ^２］は、第１誘電体１１及び第２誘電体３１の断面積である。Ｌ［ｍ］は、第１誘電体１１及び第２誘電体３１における支持部５０によって支持される固定端から自由端までの長さである（図５参照）。 The natural frequency Fn [Hz] of the first dielectric 11 and the second dielectric 31 is 200 Hz or more in a structure in which the first dielectric 11 and the second dielectric 31 are cantilever-supported. The natural frequency Fn [Hz] may be derived from experimental results or may be calculated using a calculation formula. When the natural frequency Fn [Hz] is calculated using a calculation formula, it can be calculated, for example, by the following formula (A).

Kn is a constant, and is 1.875 when the first dielectric 11 and the second dielectric 31 are cantilever-supported. E [Pa] is the Young's modulus of the first dielectric 11 and the second dielectric 31. E [Pa] is about 280 GPa when the first dielectric 11 and the second dielectric 31 are alumina. I [m ⁴ ] is the second moment of area of the first dielectric 11 and the second dielectric 31. ρ [kg/m ³ ] is the density of the first dielectric 11 and the second dielectric 31. A [m ² ] is the cross-sectional area of the first dielectric 11 and the second dielectric 31. L [m] is the length from the fixed end supported by the support portion 50 to the free end of the first dielectric 11 and the second dielectric 31 (see FIG. 5 ).

L must be longer than the length LE of the first electrode 10 and the second electrode 30. On the other hand, if L is too long, the natural frequency Fn [Hz] will be small. For this reason, in this embodiment, L is set to 21.5 mm. In this case, the natural frequency Fn [Hz] will be 3500 Hz, which is significantly greater than 200 Hz. If the thickness of the first dielectric 11 and the second dielectric 31 is 1.15 mm, and L is 90 mm or less, the natural frequency Fn [Hz] will be 200 Hz or more. Furthermore, if the thickness of the first dielectric 11 and the second dielectric 31 is made thicker, the natural frequency Fn [Hz] can be made 200 Hz even if L is longer.

The first electrode 10 and the second electrode 30 are the same size and shape, and are arranged in a plane-symmetrical positional relationship. The first dielectric 11 and the second dielectric 31 are the same size and shape, and are arranged in a plane-symmetrical positional relationship.

The first terminal 12 and the second terminal 32 are each made of metal and have a plate shape. The first terminal 12 is disposed in the first recess 15, and the second terminal 32 is disposed in the second recess 35. The first terminal 12 is electrically connected to the first electrode 10, and the second terminal 32 is electrically connected to the second electrode 30. The first terminal 12 and the second terminal 32 each have an L-shape when viewed from the short side direction.

The first terminal 12 has a first connection portion 21, a first protrusion portion 22, and a third connection portion 23. As shown in FIG. 5 and FIG. 6, the first connection portion 21 is electrically connected to the first electrode 10 through a first conductive portion 24 provided in the first dielectric 11. In this embodiment, the first conductive portion 24 is a via formed in the first dielectric 11. The first conductive portion 24 extends from the first electrode 10 to the outer surface (opposite the second dielectric 31 side) of the first dielectric 11. The first conductive portion 24 is exposed on the outer surface (opposite the second dielectric 31 side) of the first dielectric 11, and a land is formed on the exposed portion of the first conductive portion 24. The first connection portion 21 is brazed to this land. As a result, the first terminal 12 is electrically connected to the first electrode 10. The first protrusion portion 22 is connected to one end of the first connection portion 21 and protrudes toward the one end side beyond the end of the first dielectric 11. The third connection portion 23 is bent from the tip (the end on one side) of the first protrusion portion 22 and extends in the alignment direction.

The second terminal 32 has a second connection portion 41, a second protrusion portion 42, and a fourth connection portion 43. The second connection portion 41 is electrically connected to the second electrode 30 through a second conductive portion 44 provided in the second dielectric 31. In this embodiment, the second conductive portion 44 is a via formed in the second dielectric 31. The second connection portion 41 is connected to the second electrode 30 in the same manner as the connection between the first connection portion 21 and the first electrode 10 described above. The second protrusion portion 42 is connected to one end of the second connection portion 41 and protrudes further toward the one end side than the end of the second dielectric 31. The fourth connection portion 43 is bent from the tip (the end on the one end side) of the second protrusion portion 42 and extends in the line direction. The third connection portion 23 and the fourth connection portion 43 extend in opposite directions to each other.

The support 50 supports the first dielectric 11 and the second dielectric 31. The support 50 supports the first dielectric 11 and the second dielectric 31 in a cantilever manner at one end side in the longitudinal direction. In other words, the support 50 supports the first dielectric 11 and the second dielectric 31 in a cantilever manner on the same side. The support 50 has a lower Young's modulus than both the first dielectric 11 and the second dielectric 31. The support 50 is formed of a resin (e.g., polycarbonate (PC), ABS, PVC, PP, etc.). The Young's modulus of a resin material such as PC is about 1 to 2.5 GPa, which is very small compared to the Young's modulus of alumina, which is 280 GPa. For this reason, the vibration of the first dielectric 11 and the second dielectric 31, which are made of alumina, is easily absorbed by the support 50. The support 50 has a spacer 51 and a holder 52.

The spacer 51 is disposed between the first dielectric 11 and the second dielectric 31 at one end in the longitudinal direction, and forms a discharge space DS between the first dielectric 11 and the second dielectric 31 at the other end in the longitudinal direction. The spacer 51 is plate-shaped. The thickness direction of the spacer 51 is oriented in the arrangement direction of the first dielectric 11 and the second dielectric 31. The spacer 51 has a spacer portion 53 disposed between the first dielectric 11 and the second dielectric 31, and an extension portion 54 extending from the spacer portion 53 to one end in the longitudinal direction and disposed between the first protrusion 22 and the second protrusion 42.

The spacer portion 53 is plate-shaped. In the short direction, the spacer portion 53 falls within the range of the first dielectric 11 and the second dielectric 31. One end of the spacer portion 53 in the longitudinal direction is disposed closer to the other end than one end of the first dielectric 11 and the second dielectric 31 in the longitudinal direction, and the other end of the spacer portion 53 in the longitudinal direction is disposed closer to the one end than the other ends of the first protrusion portion 14 and the second protrusion portion 34.

The extension portion 54 is plate-shaped. The extension portion 54 is thinner than the spacer portion 53. The extension portion 54 does not have to be thinner than the spacer portion 53, and may be the same thickness as the spacer portion 53, for example. The extension portion 54 extends outward beyond the ends on both sides of the first terminal 12 and the second terminal 32 in the short direction. The extension portion 54 extends toward one end beyond the ends on one end side of the first terminal 12 and the second terminal 32 in the long direction.

The ozone generator 3 has a double-sided tape 55 that adheres the first dielectric 11 and the second dielectric 31 to the spacer 51. The first dielectric 11 and the second dielectric 31 are each adhered to the spacer portion 53 of the spacer 51 by the double-sided tape 55.

The holder 52 is a member that holds the first dielectric 11 and the second dielectric 31 with the spacer 51 sandwiched between them. The holder 52 is annular (specifically, rectangular cylindrical) and is arranged to surround the outer periphery of the first dielectric 11 and the second dielectric 31 with the spacer 51 sandwiched between them. The holder 52 may be annular or may have a shape other than annular. The holder 52 has a holder body 56, a locking portion 57, a first cutout portion 58, and a second cutout portion 59.

The holder body 56 is annular (specifically, rectangular cylindrical). The holder body 56 may be annular or may have a shape other than annular. The holder body 56 has a pair of first walls 56A arranged on both sides in the arrangement direction, and a pair of second walls 56B arranged on both sides in the short direction.

The locking portion 57 protrudes inward from the inner surface of the other end of the holder body 56 in the longitudinal direction. The locking portion 57 protrudes from the inner surfaces of the pair of first wall portions 56A. The locking portion 57 is formed over the entire area of the first wall portion 56A in the short direction.

The first cutout portion 58 is cut out to expose the first terminal 12 and the second terminal 32. The first cutout portion 58 is cut out at one end of the pair of first wall portions 56A in the longitudinal direction.

The second cutout portion 59 is cut out to expose the discharge space DS. The second cutout portion 59 is cut out at the other longitudinal end of the pair of second wall portions 56B. One longitudinal end of the second cutout portion 59 is located closer to the other longitudinal end of the first cutout portion 58. It is preferable that the width (spacing in the arrangement direction) of the second cutout portion 59 is greater than the inter-dielectric gap GC.

As shown in Fig. 8, the holder 52 is inserted from the other end side in the longitudinal direction into the first dielectric 11 and the second dielectric 31 sandwiching the spacer 51. The holder 52 is positioned by the locking portion 57 contacting the longitudinal ends of the first overhanging portion 14 of the first dielectric 11 and the second overhanging portion 34 of the second dielectric 31. As shown in Fig. 9, when the distance between the outer surfaces of the first dielectric body 13 and the second dielectric body 33 sandwiching the spacer 51 in the arrangement direction is L1, the distance between the outer surfaces of the first overhanging portion 14 and the second overhanging portion 34 sandwiching the spacer 51 is L2, the minimum distance between the inner surfaces of the pair of second wall portions 56B of the holder 52 is L3, and the distance between the inner surfaces of the pair of locking portions 57 of the holder 52 is L4, the following formulas (2) and (3) are satisfied.
L1≦L4 ...Equation (2)
L4<L2≦L3 ...Equation (3)

As shown in Figures 2 and 3, the ozone generator 100 has a flow path configuration section 60, a peripheral wall section 61, a bottom section 62, a ceiling section 63, a finger guard 64, an intake section 65, and a diffusion plate 66.

The flow path configuration section 60 is a part that configures the flow path 1. The flow path configuration section 60 is structured to be divided into multiple (two in this embodiment) divided bodies in the circumferential direction. Specifically, the flow path configuration section 60 has a first divided body 60A and a second divided body 60B that are divided in the circumferential direction, and is configured by connecting the first divided body 60A and the second divided body 60B.

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

The bottom 62 is the portion that is placed on the placement surface. The bottom 62 supports the flow path configuration portion 60 that is placed above it. The bottom 62 is shaped to fit inside the air intake 5 that is arranged in a ring shape. The bottom 62 also has an outer shape that is smaller than the inner circumference of the peripheral wall portion 61.

The ceiling portion 63 is disposed at the other end side in the Z direction of the ozone generator 100, and is annular with the Z direction as the axial direction. An exhaust port 6 is formed inside the ceiling portion 63. The outer periphery of the ceiling portion 63 is connected to the end portion (the upper end portion in this embodiment) on the other end side of the peripheral wall portion 61, and is formed integrally with the peripheral wall portion 61. The peripheral wall portion 61 and the ceiling portion 63 are disposed above the flow path configuration portion 60 with the finger guard 64 sandwiched therebetween, and are supported by the flow path configuration portion 60. The peripheral wall portion 61 is supported in a state where it is floating above the mounting surface.

The finger guard 64 is a planar (disk-shaped in this embodiment) portion with multiple through holes. The through holes are formed in a slit shape. The finger guard 64 has the function of preventing the intrusion of foreign objects (e.g., fingers) from the outside while allowing exhaust from the flow path 1. The finger guard 64 is configured as a separate member from the flow path configuration portion 60 and the ceiling portion 63. The finger guard 64 is positioned downstream of the diffusion plate 66.

The intake section 65 is a portion that forms the intake port 5 and is annular. The intake section 65 is disposed between the inner circumferential side of the lower end of the peripheral wall section 61 and the outer circumferential side of the upper end of the bottom section 62, and is engaged with the flow path configuration section 60. The intake section 65 has multiple intake ports 5 formed therein. The multiple intake ports 5 are arranged in a ring shape along the annular intake section 65. The intake ports 5 are long in the radial direction.

The diffusion plate 66 diffuses the ozone generated by the ozone generator 3 into 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 portion of the circumferential direction of the wall surface 1A. The width of the diffusion plate 66 decreases with increasing distance from the wall surface 1A. The diffusion plate 66 is fan-shaped. The diffusion plate 66 is disposed at a position overlapping with the ozone generator 3 when viewed from the other end side in the Z direction. The diffusion plate 66 is formed integrally with the flow path configuration portion 60 (specifically, the first divided body 60A).

As shown in Figures 3 and 10, the ozone generator 100 has a holding part 70, a first mating terminal 71, a second mating terminal 72, a screw 73, and an AC power source 74.

The holding part 70 is a part that holds the ozone generator 3. The holding part 70 has a first storage part 75, a terminal fixing part 76, and a second storage part 77. The first storage part 75 has a bottom surface and a surrounding part that protrudes from the bottom surface and surrounds the outer periphery of the holder 52. The first storage part 75 accommodates one end side of the longitudinal direction of the holder 52. At least a part of the holder 52 protrudes from the open end of the first storage part 75. The first storage part 75 has a notched groove 75A into which the first terminal 12 and the second terminal 32 of the ozone generator 3 are fitted. The terminal fixing part 76 is provided corresponding to each of the first terminal 12 and the second terminal 32. The terminal fixing part 76 has a female screw part. The third connection part 23 of the first terminal 12 is fastened together with the first mating terminal 71 by a screw 73 to one of the terminal fixing parts 76. The fourth connection portion 43 of the second terminal 32 is fastened together with the second mating terminal 72 to the other terminal fixing portion 76 by a screw 73. The first mating terminal 71 and the second mating terminal 72 are each electrically connected to an AC power source 74.

The second storage section 77 stores one longitudinal end of the ozone generator 3 stored in the first storage section 75, and stores at least the entire first terminal 12 and the entire second terminal 32. The inside of the second storage section 77 is resin molded up to a position where at least the entire first terminal 12 and the entire second terminal 32 are buried. At least a portion of the holder 52 (specifically, at least the other end side of the longitudinal end of the second cutout section 59) protrudes from the molded resin.

The holding part 70 is fixed to the outer surface of the flow path configuration part 60. As shown in FIG. 3, the holding part 70 is arranged on the outside of the wall surface 1A of the flow path 1. The holding part 70 holds the support part 50 of the ozone generator 3 on the outside of the wall surface 1A. The wall surface 1A of the flow path 1 has an opening 1B that allows the ozone generator 3 to protrude inward. The first dielectric 11 and the second dielectric 31 of the ozone generator 3 are arranged in a state where they protrude from the opening 1B to the inside of the wall surface 1A. At least a part of the first electrode 10 and at least a part of the second electrode 30 are arranged inside the wall surface 1A. The holder 52 is also arranged in a state where it protrudes from the opening 1B to the inside of the wall surface 1A.

The AC power supply 74 has a transformer and can supply AC power. The AC power supply 74 generates the desired AC power based on the power supplied from a commercial power supply external to the ozone generator 100, and supplies it to the ozone generator 3, etc.

As shown in FIG. 11, the ozone generator 100 has 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 mainly composed of a microcomputer, and has a CPU, ROM, RAM, a drive circuit, etc.

The operation unit 81 is, for example, a switch that switches between an on and off state by pressing, such as a tactile switch. A signal indicating the operation result of the operation unit 81 is input to the control unit 80. The ozone detection unit 82 detects the ozone concentration of the air outside the ozone generator 100. A signal indicating the detection value of the ozone detection unit 82 is input to the control unit 80.

The control unit 80 can control the operation of the ozone generator 3 via the AC power supply 74. The control unit 80 can adjust the amount of ozone generated by the ozone generator 3 by controlling the AC voltage applied to 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 based on the ozone concentration detected by the ozone detection unit 82 so that the ozone concentration approaches a target value.

The control unit 80 can control the operation of the fan 2. The control unit 80 PWM controls the fan 2 by providing a PWM signal to the fan 2. In this way, 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 power on/off state, the operating state of the fan 2, the external ozone concentration, etc., depending on the lighting state of the LED.

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

1-2. Regarding the Filter 90 The ozone generator 100 includes a filter 90 and a filter frame 91, as shown in FIGS.

The filter 90 is disposed in the induction flow path 7. The filter 90 is, for example, a HEPA (High Efficiency Particulate Air) filter, a medium-performance filter, or the like. The filter 90 is annular (specifically, annular). The filter 90 has multiple (four in this embodiment) divided filters 90A that are divided in the circumferential direction.

The filter frame 91 has a frame body 92 and a knob portion 93. The frame body 92 is annular (specifically, annular). The frame body 92 has a plurality (two in this embodiment) of divided frames 92A divided in the circumferential direction. The frame body 92 has a mounting hole 94 to which the filter 90 is attached. A plurality (four in this embodiment) of mounting holes 94 are provided along the circumferential direction of the filter frame 91. Each of the divided filters 90A is attached to each mounting hole 94. As a result, the filter 90 is attached to the mounting hole 94. The knob portion 93 protrudes outward from the outer peripheral surface of the frame body 92. The knob portion 93 is plate-shaped, and the circumferential direction is the thickness direction. The knob portion 93 is disposed in the circumferential center of the divided frame 92A. The knob portion 93 is disposed biased to one side in the axial direction of the frame body 92. The knob portion 93 protrudes beyond one end of the frame body 92 in the axial direction of the frame body 92.

The following description relates to the mounting structure of the filter 90.
As shown in FIG. 12 , the above-mentioned flow path component 60 has a tubular (specifically, cylindrical) first component 101 that constitutes the exhaust side flow path 8, a second component 102 that extends radially outward from one end side of the first component 101 in the Z direction, and an annular third component 103 that extends from the outer circumferential end side of the second component 102 to one end side in the Z direction.

The second component 102 is annular and has a component surface 104 facing one end side in the Z direction. The component surface 104 forms a part of the guide flow path 7. The second component 102 further has a mounting portion 110 to which the filter frame 91 is attached. The mounting portion 110 is disposed on the component surface 104. The mounting portion 110 has a mounting groove 111, a guide groove 112, a partition portion 113, and a knob accommodating groove 114.

The mounting groove 111 is provided on the component surface 104 and is formed in an annular shape (specifically, a circular ring shape) so as to surround the outer periphery of the first component 101 (exhaust side flow path 8). The mounting groove 111 opens at one end side in the Z direction. The filter frame 91 is mounted in the mounting groove 111.

The guide groove 112 is formed by extending a portion of the mounting groove 111 in the circumferential direction toward one end in the Z direction. A plurality of guide grooves 112 (four in this embodiment) are provided at equal intervals along the circumferential direction of the mounting groove 111. The partition portion 113 is a portion that separates the split frames 92A, and is provided in the mounting groove 111 and the guide groove 112. The knob accommodating groove 114 is a portion that accommodates the knob portion 93 of the filter frame 91, and is formed to extend radially outward from the guide groove 112.

When the filter frame 91 is mounted to the mounting portion 110, the filter 90 is first attached. Then, the filter frame 91 is moved along the guide groove 112 to the other end in the Z direction with the knob portion 93 oriented to be disposed at one end in the Z direction, and is mounted in the mounting groove 111. Specifically, the divided frames 92A are individually mounted to the portions partitioned by the partition portion 113. The filter frame 91 fits into the mounting groove 111 to complete mounting to the mounting portion 110. The filter frame 91 is not locked to the mounting portion 110, and is therefore allowed to move to one end in the Z direction. In other words, the filter frame 91 is allowed to come out of the mounting portion 110.

The third component 103 has a mounting portion 115. The mounting portion 115 is configured as a locking groove. By mounting the above-mentioned intake portion 65 to the mounting portion 115, the intake portion 65 is positioned on one end side of the filter frame 91 in the Z direction, thereby preventing the filter frame 91 from coming off the mounting portion 110.

As shown in FIG. 12, the intake section 65 has an intake section main body 120 and an attachment section 121.

The intake unit body 120 is annular (specifically, circular). The intake unit body 120 has multiple (two in this embodiment) divided intake units 120A divided in the circumferential direction. The intake unit body 120 is plate-shaped, and the axial direction of the intake unit body 120 is the thickness direction. The intake ports 5 are formed penetrating the intake unit body 120 in the axial direction. The intake ports 5 are arranged at equal intervals along the circumferential direction of the intake unit body 120. The radial length of the intake port 5 is longer than the circumferential length of the intake unit body 120.

The mounting portion 121 is attached to the mounting portion 115 of the flow path configuration portion 60. As shown in FIG. 2, the mounting portion 121 is a cantilever-shaped locking piece that extends to the other end side in the Z direction. When the intake portion 65 is pressed against the other end side in the Z direction against the flow path configuration portion 60, the tip side of the locking piece, which is the mounting portion 121, bends. When the intake portion 65 is pressed further, the mounting portion 121 is locked into the locking groove, which is the mounting portion 115, by its own elastic force. This causes the intake portion 65 to be attached to the mounting portion 115 of the flow path configuration portion 60. The intake portion 65 attached to the mounting portion 115 prevents the filter frame 91 from coming off the mounting portion 110.

When replacing the filter 90, the ozone generator 100 is in the state shown in FIG. 13, with the intake section 65 and plug 130 removed, and in the state shown in FIG. 14. The intake section 65 is removed by pulling it toward one end in the Z direction. In the state shown in FIG. 14, the filter frame 91 is exposed at one end in the Z direction. The bottom 62 is disposed adjacent to the inner circumference of the frame body 92 in the filter frame 91. This makes it difficult to grasp the frame body 92. However, the outer circumference of the frame body 92 is provided with a knob portion 93 that protrudes radially outward. This allows the operator to easily remove the filter frame 91 by grasping the knob portion 93, and replace the filter 90.

Also, as shown in FIG. 15, the opening width WK1 of the mounting hole 94 in the axial direction (Z direction) of the intake port 5 arranged along the annular shape is larger than the opening width WK2 of the intake port 5 in the direction perpendicular to the axial direction (Z direction).

1-3. Effects of the First Embodiment In the first embodiment, the support portion 50 has a lower Young's modulus than both the first dielectric 11 and the second dielectric 31. Therefore, even if the first dielectric 11 or the second dielectric 31 vibrates, stress is unlikely to be applied to the portion supported by the support portion 50. Therefore, the first dielectric 11 and the second dielectric 31 are unlikely to be damaged.

Furthermore, since the first dielectric 11 and the second dielectric 31 are cantilevered on the same side, an opening can be created between the first dielectric 11 and the second dielectric 31 at the other end in the longitudinal direction. This makes it easier for gas to enter the discharge space DS formed between the first dielectric 11 and the second dielectric 31, thereby improving the efficiency of ozone generation.

Furthermore, the support portion 50 has a spacer 51 disposed between the first dielectric 11 and the second dielectric 31. Therefore, the distance between the first dielectric 11 and the second dielectric 31 can be easily set by the spacer 51.

Furthermore, the support portion 50 has an extension portion 54 that extends from the spacer portion 53 and is disposed between the first protrusion portion 22 and the second protrusion portion 42. This makes it possible to more reliably insulate the first terminal 12 and the second terminal 32.

Furthermore, since the third connection portion 23 of the first terminal 12 is bent and extends from the tip of the first protrusion 22, it is possible to suppress the spread of the first terminal 12 in the protruding direction of the first protrusion 22. Furthermore, since the fourth connection portion 43 of the second terminal 32 is bent and extends from the tip of the second protrusion 42, it is possible to suppress the spread of the second terminal 32 in the protruding direction of the second protrusion 42.

Furthermore, the support part 50 has a holder 52 that holds the first dielectric 11 and the second dielectric 31 sandwiched between the spacer 51. Therefore, the spacer 51 and the holder 52 of the support part 50 can maintain a constant distance between the first dielectric 11 and the second dielectric 31.

Furthermore, the holder 52 is annular and surrounds the outer periphery of the first dielectric 11 and the second dielectric 31 with the spacer 51 sandwiched between them. Therefore, the first dielectric 11 and the second dielectric 31 with the spacer 51 sandwiched between them can be easily assembled by inserting them through the hole in the holder 52.

Furthermore, the holder 52 has a first cutout portion 58 that is cut out to expose the first terminal 12 and the second terminal 32. This makes it easier to fill the first terminal 12 and the second terminal 32 with resin through the first cutout portion 58.

Furthermore, the holder 52 has a second cutout portion 59 that is cut out to expose the discharge space DS. Therefore, while the holder 52 surrounds the outer periphery of the first dielectric 11 and the second dielectric 31, it is possible to allow gas to flow into the discharge space DS through the second cutout portion 59. Therefore, it is possible to suppress a decrease in the amount of gas flowing into the discharge space DS due to the provision of the holder 52.

Furthermore, the first dielectric 11 and the second dielectric 31 are made of ceramic, and the support portion 50 is made of resin. Therefore, even though the first dielectric 11 and the second dielectric 31 are made of ceramic, damage to the first dielectric 11 and the second dielectric 31 can be suppressed when stress is applied to the portion supported by the support portion 50 when vibration is applied.

Furthermore, the natural frequency Fn of the first electrode 10 and the second electrode 30 is 200 Hz or more. Therefore, in a situation where vibration is applied from the outside, such as during transportation, the vibration caused by resonance can be suppressed to a small value, and as a result, the stress acting on the first dielectric 11 and the second dielectric 31 during vibration is reduced, making them less likely to break.

Furthermore, the support portion 50 has a double-sided tape 55 that adheres the first dielectric 11 and the second dielectric 31 to the spacer 51. This makes it easy to adhere the first dielectric 11 and the second dielectric 31 to the spacer 51.

Furthermore, the support part 50 of the ozone generator 3 supports the first dielectric 11 and the second dielectric 31 in a cantilever manner at one end in the longitudinal direction, and is held outside the wall surface 1A of the flow path 1. The first dielectric 11 and the second dielectric 31 of the ozone generator 3 are arranged to protrude inward from the wall surface 1A. Therefore, the ozone generator 100 can simplify its structure because the structure and wiring for fixing the ozone generator 3 can be consolidated compared to a configuration in which the ozone generator 100 is supported at both ends or in which the ozone generator 100 is supported at alternate cantilevers.

The following effects relate to filter 90:
The flow path 1 has an exhaust port 6, an intake port 5 arranged outside the outer periphery of the exhaust port 6, an induction flow path 7 that induces the gas sucked from the intake port 5 to the inside of the inner periphery of the intake port 5, and an exhaust-side flow path 8 that leads the gas induced by the induction flow path 7 to the exhaust port 6. The filter 90 is arranged in the induction flow path 7. As a result, the filter 90 is arranged in the induction flow path 7 that induces the gas sucked from the intake port 5 to the inside of the inner periphery of the intake port 5, so that the filter 90 is not visible or is difficult to see from the intake port 5. Therefore, it is possible to suppress a decrease in design due to the filter 90 being visible from the outside. In this specification, "outside the outer periphery of the exhaust port 6" means "outside the outer periphery of the exhaust port 6 when viewed from the direction in which the exhaust port 6 opens (Z direction)" and can also be said to be "radially outside the circular exhaust port 6 (radially outside the circular exhaust port 6 when viewed from the direction in which the exhaust port 6 opens)".

Furthermore, the intake port 5 is arranged along a ring outside the outer periphery of the exhaust port 6. The guide flow passage 7 is arranged along a ring, and guides the gas sucked in from the intake port 5 to the inside of the inner periphery of the intake port 5. The filter 90 is arranged along a ring in the guide flow passage 7. Therefore, gas can be sucked into the flow passage 1 from the entire circumference of the ozone generator 100, and foreign matter in the sucked gas can be efficiently removed by the filter 90.

Furthermore, the filter 90 is arranged along the intake direction of the air intake 5. This makes it possible to make the filter 90 less visible from the air intake 5.

The ozone generator 100 further includes a filter frame 91 to which the filter 90 is attached, a mounting portion 110 to which the filter frame 91 is attached, an intake portion 65 in which an intake port 5 is formed, and a mounting portion 115 to which the intake portion 65 is detachably attached. When the intake portion 65 is attached to the mounting portion 115, it prevents the filter frame 91 from coming off the mounting portion 110, and when it is removed from the mounting portion 115, it allows the filter frame 91 to come off from the mounting portion 110. This makes it possible to mount and remove the filter frame 91 simply by removing the intake portion 65, making it easy to mount and remove the filter frame 91.

Furthermore, the mounting portion 110 has a mounting groove 111 into which the filter frame 91 fits, and the filter frame 91 is mounted to the mounting portion 110 by fitting into the mounting groove 111. This makes it easy to mount and remove the filter frame 91 to and from the mounting portion 110.

Furthermore, the filter frame 91 has an annular frame body 92 and a knob portion 93 that protrudes outward from the outer peripheral surface of the frame body 92. Even if the inner peripheral surface of the frame body 92 is adjacent to the bottom portion 62, it is easy to remove the filter frame 91 by grasping the knob portion 93 that protrudes from the outer peripheral surface of the frame body 92.

Furthermore, the filter 90 is divided into multiple divided filters 90A in the circumferential direction. This makes it easy to install the filter 90.

Furthermore, the opening width WK1 of the mounting hole 94 in the axial direction of the intake port 5 arranged along the annular shape is formed larger than the opening width WK2 of the intake port 5 in the direction perpendicular to this axial direction. This allows the collection area of the filter 90 to be larger than the opening area of the intake port 5, thereby suppressing the pressure loss caused by the filter 90 while suppressing the deterioration of the function of the filter 90 to remove foreign matter.

<Other embodiments>
The present invention is not limited to the embodiments described above and in the drawings, and the following embodiments are also included in the technical scope of the present invention. In addition, the various features of the above-mentioned embodiments and the embodiments to be described later may be combined in any combination as long as they are not contradictory.

In the above embodiment, the Z direction is the up-down direction, but it is not limited to the up-down direction. For example, the Z direction may be a direction that is inclined with respect to the up-down direction.

In the above embodiment, the support portion supports the first dielectric and the second dielectric at one end, but it may support them at both ends.

In the above embodiment, the support portion supports the first dielectric and the second dielectric in a cantilever manner on the same side, but the support portion does not have to support the first dielectric and the second dielectric in a cantilever manner on the same side. For example, the support portion may support the first dielectric and the second dielectric in a cantilever manner on opposite ends in a staggered manner.

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

Reference Signs List 1...flow path 3...ozone generator 5...intake port 6...exhaust port 7...guiding flow path 8...exhaust side flow path 60...flow path configuration section 65...intake section 90...filter 90A...split filter 91...filter frame 92...filter body 93...grip section 94...mounting hole 100...ozone generator 110...mounting section 113...partition section 114...accommodation groove 115...mounted section 120...intake section body 121...mounting section WK1...opening width of mounting hole WK2...opening width of intake port

Claims (7)

An ozone generator that generates ozone;
a flow path in which the ozone generator is provided;
A filter provided in the flow path,
the flow path includes an exhaust port, an intake port disposed outside an outer periphery of the exhaust port, a guide flow path that guides the gas sucked through the intake port to a position inside an inner periphery of the intake port, and an exhaust-side flow path that guides the gas guided by the guide flow path to the exhaust port,
The filter is disposed in the induction flow path,
a filter frame to which the filter is attached;
a mounting portion to which the filter frame is mounted;
an intake section in which the intake port is formed;
A mounting portion to which the intake portion is detachably attached,
The ozone generator has an intake section that prevents the filter frame from coming off the mounting section when attached to the mounting portion, and allows the filter frame to come off the mounting section when detached from the mounting portion. the mounting portion has a mounting groove into which the filter frame fits,
The ozonizer according to claim 1 , wherein the filter frame is attached to the attachment portion by fitting into the attachment groove. An ozone generator that generates ozone;
a flow path in which the ozone generator is provided;
A filter provided in the flow path,
the flow path includes an exhaust port, an intake port disposed outside an outer periphery of the exhaust port, a guide flow path that guides the gas sucked through the intake port to a position inside an inner periphery of the intake port, and an exhaust-side flow path that guides the gas guided by the guide flow path to the exhaust port,
The filter is disposed in the induction flow path,
The filter further comprises a filter frame to which the filter is attached,
The filter frame of the ozone generator has an annular frame body and a knob portion protruding outward from an outer circumferential surface of the frame body. An ozone generator that generates ozone;
a flow path in which the ozone generator is provided;
A filter provided in the flow path,
the flow path includes an exhaust port, an intake port disposed outside an outer periphery of the exhaust port, a guide flow path that guides the gas sucked through the intake port to a position inside an inner periphery of the intake port, and an exhaust-side flow path that guides the gas guided by the guide flow path to the exhaust port,
The filter is disposed in the induction flow path,
The filter further includes a filter frame having a mounting hole to which the filter is attached,
The intake port is disposed along an annular shape outside an outer periphery of the exhaust port,
the induction flow passage is disposed along an annular shape and induces the gas sucked through the intake port to a position inside an inner periphery of the intake port;
The filter is disposed along an annular path in the induction flow path,
an ozone generator, wherein an opening width of the mounting hole in an axial direction of the air intake ports arranged along an annular shape is larger than an opening width of the air intake ports in a direction perpendicular to the axial direction. The intake port is disposed along an annular shape outside an outer periphery of the exhaust port,
the induction flow passage is disposed along an annular shape and induces the gas sucked through the intake port to a position inside an inner periphery of the intake port;
5. The ozone generator according to claim 1 , wherein the filter is disposed along an annular path in the induction flow path. 6. The ozone generator according to claim 1, wherein the filter is disposed along an intake direction of the intake port. 6. The ozone generator according to claim 1, wherein the filter is divided into a plurality of divided filters in a circumferential direction.

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