Ozone generator

Abstract

To provide an ozone generator with improved ozone generation efficiency.SOLUTION: An ozone generator 1a comprises a blower 2a, a gas feeder 3a feeding air flowing through an adsorption filter 31a adsorbing ammonia or NOx contained in raw material air, an ozone generator 4a generating ozone from air discharged from the gas feeder, a gas conveyor 5a generating ozone-containing gas in the ozone generator from air, i.e., a raw material, allowed to pass through the adsorption filter by sucking raw material air from the gas feeder using air supplied from the blower as a driving force and sucking the ozone-containing gas to mix the ozone-containing gas and air discharged from the blower to convey and discharge the mixed gas, and a throttle 6a. The ozone generator comprises an electrode generating ozone by silent discharge and the throttle supplies the electrode with air of increased speed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to an ozone generator. [Background technology]

[0002] Devices that generate ozone gas using air as a raw material are known. For example, Patent Document 1 below describes a technique for generating ozone gas using air as a raw material, using a pair of electrodes in which conductive silver paste is filled inside a hollow glass tube. Specifically, ozone is generated from oxygen present in the air by causing a silent discharge between the pair of electrodes in the air.

[0003] Patent Document 2 describes that when generating ozone gas using air as a raw material, if the air contains ammonia, it reacts with NOx generated around the electrode to produce ammonium nitrate, which adheres to the electrode, causing a gradual decrease in ozone production. In the ozone generator described in Patent Document 2, air is passed through a filter to remove dust, an ammonia adsorbent, and an ozone generator in that order to generate ozone. The air is said to be drawn in by an air pump or ejector. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] WO2008 / 108331 publication [Patent Document 2] Japanese Patent Application Publication No. 11-263604 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] Patent Document 2 states that ammonia contained in the air reacts with NOx generated near the electrode to produce ammonium nitrate. However, during our investigation, we confirmed that the amount of ammonium nitrate produced from ammonia in the air is trace, and that the main component is ammonium nitrate produced by the reaction of nitrogen oxides (NOx) in the air with ozone generated by the ozone generator.

[0006] In any case, if the raw air supplied to the ozone generator contains impurities, ammonium nitrate may be produced, which is undesirable in terms of ozone generation efficiency. For this reason, it is preferable to purify the raw air before supplying it to the electrodes of the ozone generator.

[0007] In the ozone generator described in Patent Document 2, the air is purified with an adsorbent, and the purified air is supplied to the electrodes. This prevents the adhesion of ammonium nitrate, and thus prevents the phenomenon in which the ozone generation efficiency gradually decreases due to ammonium nitrate.

[0008] However, in the ozone generator described in Reference Document 2, when a configuration is adopted in which air is drawn in by an ejector, the flow rate of air supplied to the ozone generator becomes small, and consequently, the ozone generation efficiency also decreases. The inventors of the present invention investigated and found that when the air flow rate is small, the electrodes are not as well air-cooled, and as a result, the ozone generation efficiency decreases compared to when the flow rate is large.

[0009] The present invention aims to provide an ozone generator that increases the ozone generation efficiency in an ozone generator that draws in raw material air from an air supply section and generates an ozone-containing gas in an ozone generation section using the air that has passed through the adsorption filter as raw material. [Means for solving the problem]

[0010] The system comprises a blower, an air supply unit that supplies air that has passed through an adsorption filter to adsorb ammonia or nitrogen oxides contained in the raw air, an ozone generating unit that generates ozone from the air discharged from the air supply unit, and a gas transport unit that uses the air supplied from the blower as a driving force to draw in raw air from the air supply unit, generates ozone-containing gas in the ozone generating unit using the air that has passed through the adsorption filter as raw material, draws in the ozone-containing gas, mixes and transports the air discharged from the blower unit with the ozone-containing gas, and discharges the mixture. The above problem is solved by an ozone generator having a vent and a throttling section, wherein the ozone generator is equipped with an electrode that generates ozone by silent discharge, the ozone generator is equipped with a flow path that incorporates the electrode, the air supply section is equipped with a flow path that incorporates the adsorption filter, the throttling section is provided downstream of the adsorption filter and upstream of the electrode, and the opening area of ​​the throttling section is configured to be smaller than the opening area of ​​the air supply section's flow path downstream of the adsorption filter and upstream of the flow path that incorporates the electrode.

[0011] In the above invention, in an ozone generator that draws in raw material air from an air supply section and generates ozone-containing gas in the ozone generation section using the air that has passed through the adsorption filter as raw material, the throttling section can be used to supply air with an increased flow rate to the electrodes. This makes it possible to increase the ozone generation efficiency compared to an ozone generator without a throttling section. According to the present invention, it is possible to increase the ozone generation efficiency in a suction-type ozone generator with a small flow rate.

[0012] In the ozone generator described above, it is preferable that the airflow path of the air supply section and the airflow path of the ozone generation section are directly connected without the use of a flexible tube. By directly connecting the airflow path containing the electrodes and the airflow path containing the adsorption filter, rather than through a flexible tube, it is possible to prevent the tube from unintentionally bending, which could interrupt the flow of gas and lead to an accident. Furthermore, in the ozone generator, the airflow path containing the electrodes and the airflow path containing the adsorption filter can be arranged in a space-saving manner. In addition, if a tube is used, the length of the airflow path increases by the length of the tube, causing pressure loss due to frictional resistance and reducing the flow rate of air supplied to the electrodes. By directly connecting the airflow path of the air supply section and the airflow path of the ozone generation section, the reduction in flow rate can be made relatively small.

[0013] In the ozone generator described above, it is preferable that the flow path of the ozone generation section and the transport section are directly connected without the use of a flexible tube. Similarly, this eliminates the problems caused by kinking of the tube and the problem of pressure loss due to the length of the tube, and allows the flow path containing the electrodes and the transport section to be arranged in a space-saving manner.

[0014] In the ozone generator described above, the air supply section has an opening for taking in raw material air, and it is preferable that the opening area of ​​the opening is larger than the opening area of ​​the throttling section. By increasing the opening area of ​​the air supply section, the flow rate of air taken into the ozone generator can be increased, thereby increasing the ozone generation efficiency.

[0015] In the ozone generator, an opening is provided in the flow path of the air supply section, and a cover provided with a plurality of through holes for ventilation is provided at the opening. The plurality of through holes can function as openings for taking in raw air. By appropriately changing the opening area of the through holes for ventilation, the flow rate of the gas containing ozone discharged from the ozone generator and the flow rate of the raw air taken into the ozone generator can be adjusted according to the required specifications, thereby changing the concentration of ozone. Further, by providing the cover, the deviation of the air flow supplied to the adsorption filter can be corrected and adjusted.

[0016] In the ozone generator, a rectifying section is provided downstream of the adsorption filter built in the air supply section and upstream of the electrodes. The rectifying section preferably has a configuration having a plurality of long holes through which the air that has passed through the adsorption filter passes. The rectifying section can correct and adjust the deviation of the air flow supplied to the electrodes. Thereby, the ozone concentration contained in the gas discharged from the ozone generator can be stabilized.

Advantages of the Invention

[0017] According to the present invention, in an ozone generator that sucks raw air from an air supply section and generates a gas containing ozone in an ozone generation section using the air that has passed through the adsorption filter as a raw material, an ozone generator with increased ozone generation efficiency can be provided.

Brief Description of the Drawings

[0018] [Figure 1] It is a cross-sectional view of an ozone generator according to the first embodiment. [Figure 2] It is an enlarged view of the air supply section and the ozone generation section of the ozone generator of FIG. 1. [Figure 3] It is a view showing the state of the throttle section of the ozone generator of FIG. 1 as viewed from the upstream side. [Figure 4] It is a view showing the state of the electrode unit constituting the ozone generator of FIG. 1 as viewed from the upstream side. [Figure 5] This is a cross-sectional view of the electrode at part A in Figure 4. [Figure 6] This is a perspective view showing the air supply section of an ozone generator according to the second embodiment. [Figure 7] Figure 6 is a plan view of the air intake section. [Figure 8] This is a cross-sectional view of section BB' in Figure 7. [Figure 9] This is a cross-sectional view of section CC' in Figure 8. [Figure 10] This is a cross-sectional view of section DD' in Figure 8. [Figure 11] This is a cross-sectional view of part EE' in Figure 8. [Figure 12] This is a cross-sectional view of the air supply section of an ozone generator according to the third embodiment. [Figure 13] This is a cross-sectional view of the air supply section of an ozone generator according to the fourth embodiment. [Figure 14] This is a cross-sectional view of the air supply section of an ozone generator according to the fifth embodiment. [Figure 15] This figure shows the throttle section of the ozone generator in Figure 14, viewed from the upstream side. [Figure 16] This is a cross-sectional view of the air supply section of an ozone generator according to the sixth embodiment. [Figure 17] This is a cross-sectional view of the air supply section of an ozone generator according to the seventh embodiment. [Figure 18] This is a cross-sectional view of the air supply section of an ozone generator according to the eighth embodiment. [Figure 19] This is a cross-sectional view of the air supply section of an ozone generator according to the ninth embodiment. [Figure 20] This is a cross-sectional view showing the configuration of a test ozone generator. [Figure 21] This is a cross-sectional view showing the configuration of a test ozone generator. [Figure 22] This graph shows the relationship between airflow rate and ozone production. [Figure 23] This is a cross-sectional view of an ozone generator in which various parts are connected by flexible tubes. [Modes for carrying out the invention]

[0019] The following describes embodiments of the ozone generator of the present invention. The embodiments and usage examples shown below are merely limited embodiments of the present invention, and the technical scope of the present invention is not limited to the embodiments described herein.

[0020] [First Embodiment] An ozone generator according to the first embodiment is shown in Figures 1 to 5.

[0021] The ozone generator 1a of this embodiment includes a blower unit 2a, an air supply unit 3a that supplies air that has passed through an adsorption filter 31a that adsorbs ammonia or nitrogen oxides contained in the raw air, an ozone generating unit 4a that generates ozone from the air discharged from the air supply unit 3a, a gas transport unit 5a that uses the air supplied from the blower unit 2a as a driving force to draw in raw air from the air supply unit 3a, generates an ozone-containing gas in the ozone generating unit 4a using the air that has passed through the adsorption filter 31a as raw material, draws in the ozone-containing gas, mixes and transports the air discharged from the blower unit 2a and the ozone-containing gas and discharges it, and a throttling unit 6a. The blower unit 2a and the transport unit 5a are airtightly connected and constitute a first path that transports the gas from opening 96a to opening 97a. The air supply unit 3a and the ozone generation unit 4a are airtightly connected and constitute a second path that transports air from opening 91a to opening 94a. The ozone generation unit 4a and the transport unit 5a are airtightly connected and the first and second paths merge midway through the first path.

[0022] In the ozone generator 1a, the blower unit 2a includes a sirocco fan 21a and a blower pipe 22a that discharges the air discharged from the sirocco fan 21a to the transport unit 5a, which will be described later. The blower unit 2a is not limited to this example and can be any unit that can supply air to the transport unit 5a.

[0023] For the air supply unit, known devices such as axial-flow fans like propeller fans; centrifugal fans like turbo fans or sirocco fans; mixed-flow fans like diagonal-flow fans; or transverse-flow fans like cross-flow fans or through-flow fans can be used.

[0024] The air supply section 3a consists of a flow path 32a that incorporates an adsorption filter 31a. The flow path 32a is cylindrical and contains the adsorption filter 31a in its internal space. The flow path 32a has a plate-shaped side wall 321a, a plate-shaped upper part 322a, and a plate-shaped bottom part 323a. An opening 91a for taking in raw material air is provided in the upper part 322a of the flow path 32a. The opening 91a is a circular through-hole that communicates with the internal space of the flow path and functions as a hole for taking in raw material air.

[0025] Above the bottom 323a of the air supply section 3a is a cylindrical space not filled with the adsorption filter 31a, and it communicates with the ozone generating section 4a, which will be described later, through an opening 92a provided in the side wall 321a. In a front view, the opening 92a is a rectangular through-hole with its corners formed in an arc shape.

[0026] The air intake unit only needs to have a shape that allows it to incorporate an adsorption filter and supply air that has passed through the adsorption filter to the ozone generation unit.

[0027] The adsorption filter 31a is detachably filled inside the air supply section 3a. The adsorption filter 31a consists of a plurality of activated carbon pellets 311a, which are porous material, a nonwoven fabric 312a filled between the activated carbon pellets 311a and the opening 91a, and a nonwoven fabric 312a filled below the activated carbon pellets 311a. The upstream nonwoven fabric 312a collects tangible dust contained in the air. The downstream nonwoven fabric 312a prevents the activated carbon pellets 311a from leaking downstream. The activated carbon filter adsorbs ammonia or nitrogen oxides contained in the air. The adsorption filter may be configured to be detachable by providing, for example, a fixing part such as a flange made of protrusions on the inner wall of the flow path 32a.

[0028] The adsorption filter is not limited to the examples above, and any filter capable of adsorbing ammonia or nitrogen oxides is acceptable. Examples of adsorption filters include filters in which porous materials such as zeolite are supported on a substrate such as paper or fiber, and filters in which powdered activated carbon is supported on a substrate such as paper or fiber. The nonwoven fabric mentioned above is not essential and can be omitted; it may be replaced with other known dust collection filters.

[0029] The ozone generating unit 4a is equipped with a pair of electrodes 41a as shown in Figures 4 and 5, and generates ozone through silent discharge between the electrodes. Each electrode has a shape in which a conductive material 412a is filled inside a cylindrical insulating material 411a. As shown in Figure 4, one electrode 41a and the other electrode 41a are positioned facing each other and in contact such that an overlapping portion is formed between the conductive material 412a of one electrode 41a and the conductive material 412a of the other electrode 41a. When a predetermined voltage is applied to the electrodes 41a, dielectric breakdown occurs, and silent discharge occurs between the electrodes as shown by the bidirectional arrows in Figure 4. This silent discharge occurs in the region where the conductive materials face each other, as shown by L1 in Figure 4.

[0030] As shown in Figure 4, the electrode 41a is attached to a housing 421 that houses an electronic substrate and is part of the electrode unit 42. The lower end of the housing 421 is fixed in a state where it is inserted into the flow path 43a of the ozone generating unit, which will be described later. The lower end of the electrode unit 42 is provided with an opening that exposes a pair of electrodes 41a. As shown in Figure 4, the opening has a shape in which a first opening 422 is provided on the upstream side and a second opening 423 is provided on the downstream side with respect to the electrode 41a. The air discharged from the above-mentioned air supply unit 3a reaches the electrode 41a through the first opening 422 and flows downstream of the electrode 41a through the second opening 423. The first opening 422 and the second opening 423 are elongated holes that are long in the axial direction of the electrode 41a and short in the direction intersecting the axial direction. The length of these elongated holes is the same as or larger than the length of L1, which is the region where silent discharge occurs in the electrode 41a. The length of L1 is not particularly limited, but can be, for example, 2 mm to 20 mm.

[0031] As shown in Figure 2, the ozone generating unit 4a has a channel 43a that houses an electrode 41a. The channel 43a is a rectangular tube with a cross-section where the corners are formed in an arc shape, and air taken in from the air supply unit 3a flows through its interior. A through hole is provided in the wall between the upstream end and the downstream end of the channel 43a for fitting the electrode unit 42. By fitting the electrode unit 42 into this through hole, the electrode 41a is fixed in a position where the air taken in from the air supply unit 3a comes into contact with the electrode 41a.

[0032] An opening 93a located at the upstream end of the flow path 43a is airtightly connected to an opening 92a of the air supply section 3a. An opening 94a located at the downstream end of the flow path 43a is airtightly connected to an opening 95a of the conveying section 5a, which will be described later. As shown in Figure 2, the opening 94a located at the downstream end of the flow path 43a is provided with an inclined section 931a that gradually widens the inner diameter of the flow path 43a toward the downstream side. The inclined section 931a forms a tapered surface. This shape makes it less likely for the airflow to be disturbed at the connection between the flow path 43a and the conveying section 5a, and reduces pressure loss.

[0033] The conductive material constituting the electrodes is not particularly limited, but is silver paste. Other known conductive materials may be used. The insulating material constituting the electrodes is not particularly limited, but is glass tube. Other known insulating materials may be used.

[0034] The number of electrodes is not limited to two and can be changed as appropriate. Silent discharge may also be generated between a conductive material such as metal and one electrode.

[0035] In the ozone generator 1a of this embodiment, a constricted section 6a is provided in the flow path 43a of the ozone generating section 4a. The constricted section 6a is provided downstream of the adsorption filter 31a and upstream of the electrode 41a. The constricted section 6a has an inclined section 62a that reduces the inner diameter of the flow path 43a toward the downstream, a through hole 61a, and a stepped section 63a that extends radially outward from the through hole 61a of the flow path 43a. When viewed from the downstream side in the axial direction of the flow path 43a, the stepped section 63a forms a rectangle with its corners formed in an arc shape, and the flow path 43a forms a rectangular cylindrical space with the same width and a smaller height as the rectangular flow path shown in Figure 3. The opening area of ​​the through hole 61a is set to be smaller than the opening area S of the flow path 32a of the air supply section 3a located downstream of the adsorption filter 311a and upstream of the flow path 43a which contains the electrode 41a. The opening area S is the opening area of ​​the cylindrical portion below the nonwoven fabric 321a of the adsorption filter 31a, as shown in Figure 2. In this embodiment, the through-hole 61a is an elongated hole with a longer side in the direction in which the electrode 41a extends and a shorter side in the direction perpendicular to the electrode 41a, as shown in Figure 3, and the corners of the elongated hole are rounded in an arc shape. The length of the through-hole 61a in the width direction is set to be the same as or greater than the length of L1, which is the region where silent discharge occurs at the electrode 41a. This ensures that the air constricted by the through-hole 61a reaches the entire region where silent discharge occurs at the electrode 41a.

[0036] As shown in Figure 3, the inclined portions 62a are provided above, below, to the left and to the right of the through-hole 61a so as to surround it, and the inclined portions 62a form an inclined surface in which the inner diameter of the flow path 43a gradually narrows toward the through-hole 61a, like a funnel.

[0037] The flow path 43a of the ozone generating unit 4a has a sloping section 931a at the downstream end of the electrode 41, which gradually widens the inner diameter of the flow path toward the downstream direction. When viewed from the axial direction of the flow path 43a, the sloping section 931a is rectangular in shape with its corners formed in an arc shape. The sloping section 931a forms a funnel-shaped inclined surface, which forms the opening 94a of the ozone generating unit 4a and communicates with the opening 95a of the transport unit 5a, which will be described later.

[0038] Since the opening area of ​​the throttling section 6a is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6a increases compared to the flow velocity of the raw material air after it has passed through the adsorption filter 31a of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6a to the electrode 41, the ozone generation efficiency can be increased.

[0039] The detailed principle by which increasing the airflow velocity supplied to electrode 41a increases the ozone generation efficiency is unknown, but heat is generated along with the generation of ozone by silent discharge. It is presumed that increasing the airflow velocity increases the cooling efficiency of the electrode, and consequently, the ozone generation efficiency also increases.

[0040] As shown in Figure 1, the transport unit 5a is a member equipped with a cylindrical flow path inside which air supplied from the air blowing unit 2a circulates in its internal space. It has an opening 96a at one end that communicates with the air blowing pipe 22a of the air blowing unit 2a, and an opening 97a at the other end for discharging gas containing ozone. Between the opening 96a at one end and the opening 97a at the other end, there is an opening 95a that communicates with an opening 94a located at the end of the flow path 43a of the ozone generating unit 4a. The opening 96a at one end is provided on the side of the transport unit 5a, and the opening 96a communicates with a hexahedral space, which communicates with the first flow path 51a described later.

[0041] In the conveying section 5a, air discharged from the blowing section 2a flows through a first flow path 51a that connects an opening 96a at one end with an opening 97a at the other end. A second flow path 52a is provided in a direction intersecting the first flow path 51a, and the first flow path 51a and the second flow path 52a communicate with each other. The second flow path 52a communicates with an opening 95a. Inside the conveying section, there is a first inclined section 511a that slopes in a direction in which the inner diameter decreases toward the downstream, and a second inclined section 512a that slopes in a direction in which the inner diameter increases toward the downstream. The portion where the first flow path 51a and the second flow path 52a intersect is a constricted section 53a formed by the first inclined section 511a and the second inclined section 512a, and negative pressure is generated in the constricted section by the air supplied from the blowing section 2a. The constricted section of the conveying section 5a functions as a suction section of the ejector. The first inclined section 511a and the second inclined section 512a are both flow channels with a circular cross-section, and their inner walls are tapered surfaces with gradually changing inner diameters. The constricted section is a circular through-hole. The second flow channel 52a is a flow channel consisting of a circular through-hole.

[0042] In the conveying section 5a, the air supplied from the blowing section 2a is used as the driving force to draw in raw material air from the air supply section 3a, and the air that has passed through the adsorption filter 31a is used as raw material to generate ozone-containing gas in the ozone generating section. The ozone-containing gas is then drawn into the conveying section 5a, where it is mixed with the air discharged from the blowing section 2a and the ozone-containing gas, and the mixture is conveyed and discharged from the opening 97a located at the other end of the conveying section 5a. The ozone-containing gas discharged from the opening 97a at the other end of the conveying section 5a can be used for any purpose such as deodorization and sterilization.

[0043] In the ozone generator 1a of this embodiment, raw air is drawn in from the air supply unit 3a using the negative pressure generated in the transport unit 5a, and ozone is generated. Because raw air is drawn into the device using negative pressure, the airflow rate at the opening 91a of the air supply unit 3a is small, at 0.5 to 5.0 L / min. Compared to a device with a large airflow rate, a device with a small airflow rate supplies less air to the adsorption filter, thus extending the usable period of the adsorption filter. This shortens the replacement period for the adsorption filter and reduces the burden on the user. The airflow rate at the opening 91a of the air supply unit 3a may be even smaller, such as 0.5 to 4.0 L / min or 0.5 to 3.0 L / min.

[0044] In the ozone generator 1a of this embodiment, the throttling section 6a supplies air with a flow velocity increased compared to the flow velocity of the raw material air downstream of the adsorption filter 31a of the air supply section 3a to the electrode 41a, thereby increasing the ozone generation efficiency without increasing the flow rate. This makes it possible to extend the lifespan of the adsorption filter 31a and increase the ozone generation efficiency.

[0045] In the ozone generator 1a, the opening area of ​​the opening 91a of the air supply section 3a is configured to be larger than the opening area of ​​the throttling section 6a (through hole 61a). This increases the flow rate of air taken into the ozone generator 1a, thereby increasing the ozone generation efficiency. Furthermore, the opening area S of the flow path 32a of the air supply section 3a, the opening area of ​​the flow path 43a excluding the throttling section 61a in the ozone generation section 4a, and the opening 95a of the conveying section 5a are configured to be larger than the opening area of ​​the throttling section 6a (through hole 61a). By increasing the opening area of ​​each flow path, pressure loss is reduced.

[0046] [Second Embodiment] As shown in Figures 6 to 11, the ozone generator 1b of this embodiment has the same configuration as the ozone generator 1a described above, except for the configuration of the air supply section 3b. The configurations of the blower section, ozone generation section, transport section, and throttle section are the same as those of the ozone generator 1a described above, so their explanation is omitted. In the drawings, the same reference numerals are used for components that are the same as those in the ozone generator 1a of the first embodiment. The same applies hereafter.

[0047] The air supply section 3b includes a cylindrical flow path 32b, a cover 33 fitted into an opening 91b at the upper end of the flow path 32b, and a flow straightening section 34. The flow straightening section 34 is located in the space above the bottom of the cylindrical flow path 32b. The flow path 32b, like the flow path 32a, has side walls 321b and a bottom 323b, and its upper end is an opening 91b into which a protrusion of the cover 33 is fitted.

[0048] As shown in Figures 7 to 9, the cover 33 is a plate-shaped member fitted into the opening of the air supply section 3b, and has a plurality of circular through holes 331 and slit holes 332 that penetrate the cover 33. The opening area of ​​the through holes 331 is smaller than the area of ​​the cover 33. The circular through holes 331 are located on the outside of the cover 33, and the slit holes 332 are located on the inside of the cover 33, and the circular through holes 331 and the slit holes 332 are in communication with each other. Raw air is taken in through the plurality of circular through holes 331, passes through the slit holes 332, and then passes through the downstream adsorption filter 31a. The configuration of the adsorption filter 31a is the same as that of the adsorption filter 31a described above.

[0049] The cover is not a required component and may be omitted. The cover configuration is not limited to the example above; for example, it may consist only of multiple elongated holes, each smaller than the area of ​​the cover. Alternatively, for example, it may consist only of a single through-hole smaller than the area of ​​the cover. In this case, the opening area of ​​the single opening is, for example, 10 to 90 mm. 2 It can be done.

[0050] The shape of the opening at the upper end of the air intake section may be such that a single hollow tube, like a nipple, protrudes from it.

[0051] The slit holes 332 have a shape in which multiple elongated holes extend radially outward, and also have a circumferential elongated hole that communicates with the multiple elongated holes. Air taken in from the circular through holes 331 is rectified as it passes through the slit holes 332, correcting any unevenness in the airflow before flowing into the adsorption filter 31a. This prevents a reduction in the lifespan of the adsorption filter 31a due to uneven airflow.

[0052] A flow straightening section 34 is provided at the lower end of the air supply section 3b. The flow straightening section 34 has a plurality of elongated holes 342 extending radially from the center, a rod-shaped section 341 located in the center, and a discharge section 343. The discharge section 343 communicates with the plurality of elongated holes 342 and discharges air to the ozone generating section 4a through a rectangular opening 92b having a major axis perpendicular to the axial direction of the electrode provided in the side wall 321b. The elongated holes 342 are through holes provided in the solid side wall 321b, and are long in the radial direction and short in the circumferential direction. Around the base of the elongated holes, i.e., the rod-shaped section, there are substantially circular holes extending in the circumferential direction. The elongated holes 342 and the rod-shaped section 341 are shaped to extend in the direction in which the raw air flows. The flow straightening section 34 has a convex portion at its upper end and is fitted into the opening at the lower end of the side wall 321b. The discharge section 343 has a rectangular cylindrical shape when viewed from the axial direction. The shape of the flow straightening section is not limited to the above example.

[0053] In the ozone generator 1b of this embodiment, the opening area of ​​the through-hole 61a is smaller than the opening area S2 of the flow path 32b of the air supply section 3b, which is located downstream of the adsorption filter 311a and upstream of the flow path 43a containing the electrode 41a. The opening area S2 is the opening area of ​​the flower-shaped elongated hole 342 located below the nonwoven fabric 321a of the adsorption filter 31a, as shown in Figures 8 and 10.

[0054] In the ozone generator 1b of this embodiment, the throttling section 6a supplies air with a flow velocity increased compared to the flow velocity of the raw material air downstream of the adsorption filter 31a of the air supply section 3b to the electrode 41a, thereby increasing the ozone generation efficiency without increasing the flow rate. This makes it possible to extend the lifespan of the adsorption filter 31a and increase the ozone generation efficiency.

[0055] In the ozone generator 1b of this embodiment, the area of ​​the opening for taking in raw material air is the sum of the opening areas of each through-hole 331 provided in the cover 33. The opening area for taking in raw material air is set to be larger than the opening area of ​​the throttling section 6a. This increases the flow rate of air taken into the ozone generator 1b and increases the ozone generation efficiency.

[0056] [Third Embodiment] As shown in Figure 12, the ozone generator 1c of this embodiment is identical to the ozone generator 1a described above, except for the configuration of the throttling section provided in the ozone generating section. The configuration of the air supply section, air blowing section, ozone generating section, and transport section are the same as those of the ozone generator 1a described above, so their explanation is omitted.

[0057] The throttling section 6c of the ozone generator 1c is provided downstream of the adsorption filter 31a and upstream of the electrode 41a. The throttling section 6c has a first stage section 62c extending radially inward from the inner wall of the flow path 43c, a through hole 62c, and a second stage section 63c extending radially outward from the through hole 62c. The configuration of the through hole 61a is the same as that of the through hole 61a described above.

[0058] The aperture portion 6c has the same shape as the orifice. Except for the fact that the aperture portion 6c has the same shape as the orifice, the shape of the ozone generating portion 4c is the same as the shape of the ozone generating portion 4a described above.

[0059] Since the opening area of ​​the throttling section 6c is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6c increases compared to the flow velocity of the raw air downstream of the adsorption filter 31a of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6c to the electrode 41a, the ozone generation efficiency can be increased. [Fourth Embodiment] As shown in Figure 13, the ozone generator 1d of this embodiment is identical to the ozone generator 1a described above, except for the configuration of the throttling section 6d provided in the ozone generating section 4d, with only the configuration of the throttling section being different. The configurations of the air supply section, air blowing section, ozone generating section, and transport section are the same as those of the ozone generator 1a described above, so their explanation will be omitted.

[0060] The throttling section 6d of the ozone generator 1d is provided downstream of the adsorption filter 31a and upstream of the electrode 41a. The throttling section 6d has a first inclined section 62d that slopes from the inner wall of the flow path 43d toward the downstream of the flow path 43d in a direction that reduces the inner diameter of the flow path 43d, a through hole 61d, and a second inclined section 63d that slopes from the through hole 61d toward the downstream of the flow path 43d in a direction that increases the inner diameter of the flow path 43c. The configuration of the through hole 61d is the same as that of the through hole 61a described above. The first inclined section 62d and the second inclined section 63d constitute a funnel-shaped inclined surface similar to that of the ozone generator 4a described above.

[0061] The aperture section 6d has the same shape as a venturi. Except for the fact that the aperture section 6d has the same shape as a venturi, the shape of the ozone generating section 4d is the same as the shape of the ozone generating section 4a described above.

[0062] Since the opening area of ​​the throttling section 6d is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6d increases compared to the flow velocity of the raw air downstream of the adsorption filter 31a of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6d to the electrode 41a, the ozone generation efficiency can be increased. [Fifth Embodiment] As shown in Figure 14, the ozone generator 1e of this embodiment has the same configuration as the ozone generator 1a described above, except for the throttling section 6e and the lower end of the air supply section 3e provided in the ozone generation section. Only the configuration of the throttling section 6e and the lower end of the air supply section 3e differs. The configuration of the intake section, blowing section, ozone generation section, and transport section, excluding the lower end, is the same as that of the ozone generator 1a described above, so a description will be omitted.

[0063] An inclined section 33e is provided below the adsorption filter 31a at the lower end of the ozone generator 1e. This inclined section 33e creates a roughly frustoconical space 331e below the adsorption filter 31a, with the inner diameter decreasing towards the downstream (downward) direction. The opening 92e of the air supply section 3e does not have an inclined section and is not a perfect frustoconical shape. The opening 92e is a rectangular opening with arc-shaped corners, and its upper edge 921 is angled so as to be continuous with the inclined section 62e of the ozone generator 4e, which will be described later. The opening 92e communicates with the opening 93e provided at the upstream end of the flow path 43e.

[0064] The throttling section 6e of the ozone generator 1e is provided downstream of the adsorption filter 31a and upstream of the electrode 41a. The throttling section 6e has an inclined section 62e that slopes in a direction that reduces the inner diameter of the flow path 43e toward the downstream of the flow path 43e, a through hole 61e, and a stepped section 63e that extends radially outward from the through hole 61e to the flow path 43e. The configuration of the stepped section 63e is the same as that of the stepped section 63a described above. The configuration of the section downstream of the through hole 61d is the same as that of the ozone generator 4a. The configuration of the through hole 61e is also the same as that of the through hole 61a.

[0065] As shown in Figure 15, the inclined portions 62e are formed above, to the left of, and to the right of the through-hole 61e. Below the through-hole 61e, it is continuous with the lower edge of the opening 92e and is configured as a surface that extends along the axial direction of the flow path 43e. In portions other than the lower edge of the through-hole 61e, the inclined portions 62e have a funnel-shaped inclined surface.

[0066] Since the opening area of ​​the throttling section 6e is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6e increases compared to the flow velocity of the raw air downstream of the adsorption filter 31a of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6e to the electrode 41a, the ozone generation efficiency can be increased.

[0067] [Sixth Embodiment] As shown in Figure 16, the ozone generator 1f of this embodiment is identical to the ozone generator 1e described above, except for the inclined section 33f and adsorption filter 31f provided in the air supply section 3f. Only the lower end of the air supply section and the adsorption filter 31f differ. A description of the common parts will be omitted.

[0068] The upper end of the inclined portion 33f, which is provided at the lower end of the air supply section 3f, is located higher than the upper edge 921 of the opening 92e, and the lower end of the inclined portion 33f reaches the bottom 323a of the air supply section 3f's flow path 32f. Due to the height of the inclined portion 33f, the thickness of the adsorption filter 31f is reduced to less than 1 / 3 of the height of the air supply section 3f. The thickness of the activated carbon pellets 311f is also reduced. In other respects, the configuration of the flow path 43f is the same as that of the flow path 43e described above. The inclined portion 62e forms a roughly frustoconical space 331f below the adsorption filter 31f.

[0069] Since the opening area of ​​the throttling section 6e is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6e increases compared to the flow velocity of the raw air downstream of the adsorption filter 31f of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6e to the electrode 41a, the ozone generation efficiency can be increased.

[0070] [Seventh Embodiment] As shown in Figure 17, the ozone generator 1g of this embodiment is identical to the ozone generator 1a described above, except for the configuration of the throttling section 6g provided in the ozone generating section 4g, with only the configuration of the throttling section being different. The configurations of the air supply section, air blowing section, ozone generating section, and transport section are the same as those of the ozone generator 1a described above, so their explanation is omitted.

[0071] The throttling section 6g of the ozone generator 1g is provided downstream of the adsorption filter 31a and upstream of the electrode 41a. The throttling section 6g has an inclined section 62g that slopes from the inner wall of the flow path 43g toward the downstream of the flow path 43g in a direction that reduces the inner diameter of the flow path, and a through hole 61g. The opening area and shape of the through hole 61g are the same as the opening area and shape of the flow path 43g downstream of the electrode 41a. The flow path 43g is shaped to be connected to an inclined section 931a having the same configuration as described above.

[0072] The flow path 43g has a rectangular cylindrical cross-section with arc-shaped corners, and the shape of the through-hole when viewed from the upstream and downstream sides in the axial direction is a rectangular elongated hole with arc-shaped corners, similar to the embodiment described above. The inclined portion 62g forms a funnel-shaped inclined surface.

[0073] A first hole and a second hole are provided in the middle of the through hole 61g for fitting the electrode unit 42. The electrode unit 42 is fixed in place by fitting it into the first hole and the second hole.

[0074] Since the opening area of ​​the throttling section 6g is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6g increases compared to the flow velocity of the raw air downstream of the adsorption filter 31a of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6g to the electrode 41a, the ozone generation efficiency can be increased.

[0075] [Eighth Embodiment] As shown in Figure 18, the ozone generator 1h of this embodiment is identical to the ozone generator 1a described above, except for the configuration of the throttling section 6h provided in the ozone generating section 4h. The configuration of the air supply section, air blowing section, ozone generating section, and transport section are the same as those of the ozone generator 1a described above, so their explanation is omitted.

[0076] The throttling section 6h of the ozone generator 1h is located downstream of the adsorption filter 31a and upstream of the electrode 41a. The throttling section 6h is configured such that the opening area of ​​the flow path 43h, i.e., the cross-sectional area, is smaller than the opening area S of the opening 91a of the air supply section 3a. The configuration of the electrode 41a and the electrode unit 42 is the same as that of the ozone generator 1a. There is no inclined section at the end of the flow path 43h. The flow path 43h has a rectangular cylindrical cross-section with its corners formed in an arc shape. The throttling section 6g does not have any protrusions for restricting the flow.

[0077] Since the opening area of ​​the throttling section 6h is smaller than the opening area S of the air supply section 3a, the flow velocity of the air flowing through the throttling section 6h increases compared to the flow velocity of the raw air downstream of the adsorption filter 31a of the air supply section 3a. By supplying the air whose flow velocity has been increased in the throttling section 6h to the electrode 41a, the ozone generation efficiency can be increased.

[0078] [Ninth Embodiment] As shown in Figure 19, the ozone generator 1i of this embodiment is identical to the ozone generator 1a described above, except for the configuration of the air blower 2i and the transport unit 5i. The configuration of the air supply unit and the ozone generation unit are the same as those of the ozone generator 1a described above, so their explanation is omitted.

[0079] The conveying section 5i is a cylindrical member having a first opening 96i at one end, a second opening 97i at the other end, and an opening 95i in the peripheral wall located between the first opening 96i and the second opening 97i. When the supply section 2i is activated, air is taken in through the first opening 96i, flows through the cylindrical passage, and is discharged through the second opening 97i.

[0080] The air blower unit 2i is provided in the second opening 97i. In this embodiment, the air blower unit 2i uses an axial flow fan.

[0081] The opening area of ​​the first opening 96i is smaller than that of the second opening 97i. Therefore, when air is introduced into the conveying section 5i by the blowing section 2i, the resistance during air supply increases, and negative pressure is generated at the opening 95i provided in the peripheral wall. The air supply section 3a and the ozone generation section 4a are connected to this opening. Due to the negative pressure, raw material air is drawn in from the opening of the air supply section 3a. Ozone is generated from the oxygen contained in the raw material air by silent discharge in the ozone generation section 4a. The generated ozone-containing gas is drawn into the conveying section 5i from the opening 95i due to the negative pressure, mixed with the air taken in from the first opening 96i, and discharged from the second opening 97i at the other end.

[0082] In the ozone generator of this embodiment, a flange is provided on the edge of the first opening 96i to reduce the opening area of ​​the first opening and generate negative pressure in the opening 95i. The opening area may also be reduced by attaching a cover 33 similar to the one described above to the first opening 96i. Alternatively, the opening area of ​​the first opening may be reduced by making the first opening tapered. Furthermore, a material that resists the flow, such as a nonwoven fabric, may be provided at the first opening.

[0083] [effect] In the ozone generators of the above embodiments, negative pressure is used to reduce the flow rate of air drawn in from the air supply section. This makes it possible to extend the lifespan of the adsorption filter and reduce the frequency of its replacement. In addition, the throttling section increases the flow velocity of the air supplied to the electrodes, which can compensate for the decrease in ozone generation efficiency caused by the reduced flow rate.

[0084] As is clear from the structure of each embodiment described above, by using a throttling section with a smaller opening area compared to the opening area of ​​the air supply section's flow path downstream of the adsorption filter and upstream of the flow path containing the electrode, air with a higher flow velocity than the raw air flow velocity downstream of the adsorption filter in the air supply section can be supplied to the electrode. By supplying air with a higher flow velocity to the electrode, the ozone generation efficiency can be increased.

[0085] As shown in each of the embodiments described above, pressure loss due to vortex generation and the like can be reduced by providing a tapered surface with an inclined section at at least one of the following locations: the downstream portion of the adsorption filter in the air supply section, the throttling section located upstream of the electrode, the connection section between the ozone generation section and the transport section downstream of the electrode, and the constricted section in the transport section. By gradually changing the inner diameter of the flow path with the inclined section in these areas and reducing pressure loss, it becomes possible to increase the volume of the adsorption filter, for example. Increasing the volume of the adsorption filter, especially increasing the thickness of the adsorption filter, increases the volume through which air passes, resulting in pressure loss. However, by reducing the pressure loss as described above, it is possible to compensate for the pressure loss due to the increase in the volume of the adsorption filter. Furthermore, by increasing the volume of the adsorption filter, it is possible to reduce the frequency of adsorption filter replacement. Also, for example, reducing the opening area of ​​the throttling section results in pressure loss. However, by reducing the pressure loss as described above, the opening area of ​​the throttling section can be further reduced, increasing the flow velocity of the air supplied to the electrode and further increasing the ozone generation efficiency.

[0086] If the distance between the throttling section and the electrode increases, the effect of increasing the ozone generation efficiency decreases. For this reason, it is preferable to provide the throttling section upstream of the electrode in the flow path that constitutes the ozone generation section. Furthermore, it is preferable to provide a constricted section by providing a convex portion on the inner wall of the flow path that constitutes the ozone generation section. With this configuration, it is possible to make the inner diameter of the flow path in parts other than the convex portion larger, which increases the degree of design freedom. For example, by making the inner diameter of the flow path in parts other than the convex portion larger, it is possible to reduce pressure loss and narrow the gas flow more to the convex portion, thereby increasing the flow velocity of the gas supplied to the electrode. The convex portion includes stepped portions such as the first stage portion or the second stage portion mentioned above; and inclined portions such as the first inclined portion and the second inclined portion. It is preferable to provide a tapered surface on the convex portion due to the inclined portion.

[0087] By utilizing the protrusions, it becomes possible to increase the inner diameter of the flow path containing the electrodes other than those on the protrusions. This makes it possible to reduce pressure loss in the flow path. Similarly, it also becomes possible to increase the volume of the adsorption filter.

[0088] To reduce pressure loss, for example, the opening area of ​​the air intake opening can be increased to 100-1000 mm². 2 Therefore, the opening area of ​​the air intake section is increased, and the opening area of ​​the part of the air intake section where the flow path opening area is smallest is set to 500-1500 mm². 2 Therefore, widen the airflow path in the air intake section, and in the ozone generation section, increase the opening area of ​​the airflow path excluding the constricted section to 100-300 mm². 2 This can be achieved by widening the inner diameter of the flow path in the ozone generation section, gradually changing the inner diameter of the flow path by utilizing the tapered surface created by the inclined section as described above, or by directly connecting each part without using flexible tubing. In addition, the opening of the conveying section can be 110 to 330 mm. 2 By increasing the opening area of ​​the opening, the pressure loss can also be reduced.

[0089] The flow rate at the air intake opening is not particularly limited, but can be, for example, 0.5 to 5.0 L / min. The flow rate at the air intake opening may also be smaller, such as 0.5 to 4.0 L / min or 0.5 to 3.0 L / min.

[0090] The flow velocity of the raw air downstream of the adsorption filter in the air intake section is not particularly limited, but can be, for example, 0.001 to 0.24 m / sec. The flow velocity of the air in the throttling section is not particularly limited, but can be, for example, 0.2 to 3.0 m / sec.

[0091] The aperture area in the diaphragm is not particularly limited, but for example, 20 to 290 mm². 2 This can be achieved. The aperture area in the diaphragm is more preferably 20 to 100 mm². 2 That is the case.

[0092] The aperture magnification, as described later, is preferably 1.2 to 50 times, and more preferably 5 to 40 times. The aperture magnification is determined by dividing the opening area (S or S2) of the air supply section's flow path downstream of the adsorption filter and upstream of the flow path containing the electrode by the opening area of ​​the aperture section.

[0093] It is preferable that the opening area in the throttling section be smaller than the opening area of ​​the air intake section opening and the opening area of ​​the section in the air intake section where the flow path opening area is smallest. For example, in the example in Figure 8, the section in the air intake section where the flow path area is smallest is the elongated hole 342.

[0094] In the ozone generator according to each of the above embodiments, the flow path of the ozone generation section and the flow path of the air supply section are directly connected without the use of a flexible tube. Furthermore, in the ozone generator according to each of the above embodiments, the flow path of the ozone generation section and the transport section are directly connected without the use of a flexible tube.

[0095] As shown in Figure 23, in an ozone generator 1j in which an air supply unit 3j containing an adsorption filter 31j, an ozone generating unit 4j, and a transport unit (not shown) are connected by a flexible tube 8, the positions of the air supply unit 3j, the ozone generating unit 4j, and the transport unit (not shown) can be freely changed by bending the tube 8, and the layout of each part can be changed to match the shape of the housing of the ozone generator. However, when bending the tube 8, it may bend unintentionally, blocking the flow of gas taken in from the air supply unit 3j and potentially leading to an accident. In addition, the length of the tube 8 increases the length of the flow path, causing pressure loss due to frictional resistance and reducing the flow rate of air supplied to the electrode 41a.

[0096] In the ozone generators according to each of the above embodiments, the air supply unit and the ozone generation unit are directly connected without using a flexible tube 8, and the ozone generation unit and the transport unit are also directly connected, thus eliminating the problems described above.

[0097] For example, as shown in Figure 1, by shaping the air supply unit 3a so that its longitudinal direction extends vertically, arranging the ozone generating unit 4a to the side of the air supply unit 3a, arranging the blower unit 2 below the air supply unit 3a and the ozone generating unit 4a, and arranging the transport unit so that its longitudinal direction extends vertically to the side of the ozone generating unit 4a and the blower unit 2a, the gaps can be minimized and each part can be arranged in a space-saving manner. This makes it possible to further miniaturize the ozone generator 1a. If the volume of the adsorption filter 31a built into the air supply unit 3a is increased, the air supply unit 3a may be made to protrude above the ozone generating unit 4a. In the above ozone generator 1a, the airflow direction of the blower unit 2a is horizontal, and the airflow direction in the air supply unit 3a and the ozone generating unit 4a is L-shaped, flowing from top to bottom and then to the side. [Examples]

[0098] Using the test apparatus shown in Figures 20 and 21, the relationship between the gas flow rate (L / min) and the amount of ozone generated per hour (mg / hour) was investigated.

[0099] The device shown in FIG. 20 has an air supply section 3b similar to the ozone generation device shown in FIG. 8 and an ozone generation section 4a similar to the ozone generation section shown in FIG. 1, and includes a throttle section 6a. As the electrode unit in the ozone generation section, SFG1210 manufactured by Ornit Co., Ltd. was used. This electrode unit generates ozone at an efficiency of 10 mg / h. Instead of the conveying section, the flow of the gas discharged from the ozone generation section 4a was throttled through a block 71 with a funnel-shaped interior, and the throttled gas was made to flow into an ozone concentration meter 72. For the ozone concentration meter 72, EG-3000D of Ebara Industries Co., Ltd. was used. The device shown in FIG. 20 has a throttle section 6a similar to that shown in FIG. 1, and the opening area of the through hole 61a of the throttle section 6a is 31.142 mm 2 This throttle section is referred to as "throttle section 1". The device shown in FIG. 20 has an air supply section 3b similar to that shown in FIG. 8, and the opening area of the opening for taking in raw material air by summing up the opening areas of the plurality of through holes 331 provided in the air supply section 3b was determined. The opening area of the opening of the air supply section 3b is 213.628 mm 2 In the air supply section 3b, the portion where the opening area is the smallest is the long hole 342 of the rectifying section 34, and its opening area S2 is 674.557 mm 2 This is the case.

[0100] The above-mentioned ozone concentration meter 72 includes, in order from upstream to downstream, a sample cell, a flow meter, and a pump. The pump sucks the gas containing ozone generated in the ozone generation section 4a, and circulates and discharges the gas in the order of the sample cell and the flow meter. In the sample cell, the amount of ultraviolet light (253.7 nm) transmitted is measured, and based on the following formula, the ozone concentration (ppm) is automatically calculated. C = K·log(I0 / I x )[[ID=十七]] Here, C is the ozone concentration, k is the proportionality constant, I0 is the light transmittance of a sample not containing ozone, that is, air, I x is the light transmittance of a sample containing ozone.

[0101] The ozone concentration (ppm) was converted to the amount of ozone generated per hour (mg / hour) using the following formula. Ozone generation rate (mg / hour) = Ozone concentration (ppm) × 10 -6 × Measured flow rate (L / min) × 60 (min) × 48 (ozone molecular weight) ÷ 22.4 (1 mol) × 1000

[0102] The air supply section 3k of the apparatus shown in Figure 21 has a basic configuration similar to the air supply section in Figure 8, but the inner diameter of the opening of the air supply section connected to the flow path 43k of the ozone generation section 4k is enlarged to match the inner diameter of the flow path 43k of the ozone generation section 4k. The opening area of ​​the opening for taking in raw air in the air supply section 3k, calculated by summing the opening areas of the multiple through holes 331 provided in the air supply section 3k, is 213.628 mm². 2 Therefore, the opening area S3 of the channel 43k upstream of electrode 41a in the channel 43k of the ozone generation unit 4k is 226.265 mm². 2 In the air intake section 3k, the part with the smallest opening area is the elongated hole 342 of the rectifier section 34, and its opening area S2 is 674.557 mm². 2 The opening area S2 is the opening area of ​​the air supply section 3k's flow path 32k, located downstream of the adsorption filter 31a and upstream of the flow path 43k containing the electrode 41a. The opening area S3 of the flow path 43k is smaller than the opening area S2 of the air supply section 3a, forming a throttling section. This throttling section will hereinafter be referred to as "throttling section 2". The funnel-shaped block 71k was modified to match the inner diameter of the flow path of the ozone generation section. The ozone concentration meter 72 used was the same device as described above.

[0103] The aperture magnification of aperture section 1 of the device shown in Figure 20 is approximately 21.7 times, calculated by dividing 674.557 by 31.142, based on the aperture area. The aperture magnification of aperture section 2 of the device shown in Figure 21 is approximately 3 times, calculated by dividing 674.557 by 226.265. Note that the aperture magnification was calculated by dividing the aperture area S2 by the aperture area of ​​the aperture section.

[0104] Under the following conditions, the relationship between the gas flow rate (L / min) and the amount of ozone generated per hour (mg / hour) was investigated using the apparatus shown in Figures 20 and 21, respectively. Note that "gas flow rate" refers to the flow rate (L / min) measured by a flow meter placed immediately after the sample cell of the ozone concentration meter described above. Since the ozone concentration meter and the ozone generation unit are airtightly connected, and the air drawn in from the air supply unit passes through the electrodes of the ozone generation unit, this can be considered equivalent to the flow rate in the flow path where the electrodes are located. Environmental temperature: 22.1℃ Humidity: 16%RH Moisture content in the air: 3.128 g / m² 3 Dew point: -4.863℃

[0105] Figure 22 shows the relationship between the gas flow rate and the amount of ozone produced for the ozone generator (throttling section 1) in Figure 20 and the ozone generator (throttling section 2) in Figure 21.

[0106] As is clear from the graph in Figure 22, it was found that as the flow rate of gas flowing through the ozone generator increases, the amount of ozone produced per hour, i.e., the ozone production efficiency, also increases in correlation with this increase.

[0107] For example, if the flow rate of the gas flowing through the ozone generator is reduced from 3.0 L / min to 1.5 L / min, the amount of ozone generated per hour in the ozone generator (throttling section 2) shown in Figure 21 decreases by 37%. However, even at a flow rate of 1.5 L / min, the amount of ozone generated per hour differs depending on the throttling ratio of the throttling section. In an ozone generator with a relatively low throttling ratio, such as the device in Figure 21, the amount of ozone generated per hour is about 10 mg at a flow rate of 1.5 L / min, whereas in an ozone generator with a relatively high throttling ratio, such as the one in Figure 20, the amount of ozone generated per hour is about 12 mg at a flow rate of 1.5 L / min. In this example, it can be seen that by increasing the throttling ratio, a higher velocity of air is supplied to the electrodes, resulting in a 14% improvement in the amount of ozone generated per hour. If no throttling section is provided, the amount of ozone generated per hour will be even lower than that of the device in Figure 21.

[0108] As described above, in an ozone generator, the decrease in ozone generation efficiency caused by reducing the flow rate of the raw air can be improved by using a throttling section. Since the flow rate of the raw air is small in suction-type devices, the lifespan of the adsorption filter can be extended and the frequency of adsorption filter replacement can be reduced compared to ozone generators with a large flow rate of raw air. [Explanation of symbols]

[0109] 2a Air blower 3a Air supply section 32a Flow channel 31a Adsorption filter 4a Ozone generating unit 43a Flow channel 4a electrode 5a Conveying section 6a Aperture section 33 Cover 34 Rectifier 8. Flexible tube

Claims

1. The air blower unit, An air supply unit that supplies air that has passed through an adsorption filter that adsorbs ammonia or nitrogen oxides contained in the raw air, An ozone generating unit that generates ozone from the air discharged from the aforementioned air supply unit, An ozone generator having a gas transport section and a throttle section, which uses the air supplied from the blowing section as a driving force to draw in raw material air from the air supply section, generates ozone-containing gas in the ozone generating section using the air that has passed through the adsorption filter as raw material, draws in the ozone-containing gas, mixes and transports the air discharged from the blowing section with the ozone-containing gas and discharges it, and The ozone generating unit is equipped with electrodes that generate ozone by silent discharge, The ozone generating unit is equipped with a channel that incorporates the electrodes, The air supply unit is equipped with a flow path that incorporates the adsorption filter, The aforementioned throttling section is provided downstream of the adsorption filter and upstream of the electrode. An ozone generator in which the opening area of ​​the constricted portion is smaller than the opening area of ​​the air supply portion flow path downstream of the adsorption filter and upstream of the flow path containing the electrode.

2. The ozone generator according to claim 1, wherein the air supply section's flow path and the ozone generation section's flow path are directly connected without the use of a flexible tube.

3. The ozone generator according to claim 1 or 2, wherein the flow path of the ozone generating section and the transport section are directly connected without the use of a flexible tube.

4. The air supply section has an opening for taking in raw material air. The ozone generator according to claim 1 or 2, wherein the opening area of ​​the aforementioned opening is configured to be larger than the opening area of ​​the constricted portion.

5. The air intake section has an opening in its flow path. The ozone generator according to claim 1 or 2, wherein the opening is provided with a cover having a plurality of ventilation through-holes, and the plurality of through-holes function as openings for taking in raw air.

6. A flow straightening section is provided downstream of the adsorption filter built into the air supply section and upstream of the electrode. The ozone generator according to claim 1 or 2, wherein the rectifier section has a plurality of elongated holes through which air that has passed through the adsorption filter passes.

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