JP2020171777A - Air cleaning device using plasma - Google Patents

Abstract

To provide an air cleaning device capable of solving such a problem that though the practical application of an air cleaner which sterilizes or deactivates by plasma, viruses including new type coronavirus floating in air or new type influenza virus, pathogenic bacterium, mycotoxin or the like is expected, it is difficult to inexpensively, surely and quickly plasma-treat a high-capacity target space.SOLUTION: An air cleaning device is characterized by: disposing in a matrix state, numerous electrodes which make air flow in a turbulent flow state and generates a dielectric barrier discharge narrow gap plasma in a housing comprising an air inlet and a blowout port; and efficiently contacting and blending the electrode-generating plasma with the air including viruses, pathogenic bacteria, mycotoxin and the like. In the above case, it is possible to select a cylindrical or rectangular electrode.SELECTED DRAWING: Figure 5

Description

The present invention relates to an air purifier using plasma that sterilizes, sterilizes, or inactivates pathogenic bacteria, bacteria, viruses, mycotoxins, etc. using atmospheric pressure plasma. In particular, the present invention relates to an air purifier using plasma for the new coronavirus and the new influenza virus.

Recently, outbreaks of infectious diseases caused by the new coronavirus have occurred on a global scale, which has become a major social problem. The infection routes of the new coronavirus are mainly said to be droplet infection and contact infection, and it is known that wearing a mask and washing hands are effective as preventive measures. It is also said that the basis of infection prevention is to avoid the three densities. That is, (i) a closed space with poor ventilation, (ro) a place where people are crowded, and (ha) a place where conversations and vocalizations take place at short distances. When these three densities overlap, the risk of infection is highest.
As is well known, it is said that the droplet infection of the new coronavirus does not occur at a distance of 2 m. At a distance of 2 m, the new coronavirus loses its infectivity due to the drying that occurs while floating at a distance of 2 m. However, in a humid space, the new coronavirus floating in the air is difficult to dry, so that the infectivity is sufficiently maintained for about several tens of minutes. There is also a finding that it survives for 3 hours or more in the state of aerosol. That is, in a delimited space such as a general household, office, hospital, restaurant, pub, etc., there is a high possibility that the new coronavirus with infectivity is floating as an aerosol, so the risk of infection increases. To do.
To protect yourself from the new coronavirus floating in the air, it is necessary to ventilate the air in the separated space almost completely and constantly. If ventilation is not possible, it is required to purify or sterilize the air in the room. In particular, hospitals and nursing homes for the elderly are required to have air conditioning equipment with a sterilizing function.
On the other hand, for example, as described in Non-Patent Documents 1 to 3, sterilizers for agricultural products and medical devices using atmospheric pressure plasma are attracting attention. Sterilization and sterilization by plasma utilizes the electrical, physical and chemical actions of plasma, and is realized by turning air into plasma. For example, when sterilizing bacteria or viruses floating in the indoor air, the air containing the bacteria or viruses may be turned into plasma. In that case, electric field, positive ion, negative ion, ultraviolet ray, active oxygen (O radical, OH radical, etc.), active nitrogen (N radical, NO radical, etc.), ozone, etc. are generated in the air plasma. Bacteria and viruses present in are almost certainly killed or inactivated. It is known that commercially available air purifiers applied to ozonizers utilize the sterilizing effect or deodorizing effect of ozone and are completely useless for the sterilization of the new coronavirus. It is reported that research results show that ozone with a concentration of 6.0 ppm can be inactivated by exposing it to the new coronavirus for about 1 hour, but since ozone is harmful to the human body, the regulated value of ozone concentration in Japan is It is 0.1 ppm or less.
If an air purifier that utilizes the plasma sterilization effect is put into practical use and spread, it will be possible to live a safe and secure life.
From the perspective of promoting active economic activities in an environment where the new coronavirus or a new virus that may appear in the future is floating in the air, the practical application of air purifiers that utilize the plasma sterilization effect is widespread. There is expected.

Ideas or concepts of air purifiers utilizing plasma are disclosed in, for example, Patent Documents 1 to 6.
However, on the premise of practical use and widespread use, there are problems such as high power consumption or high manufacturing cost. That is, all of them have problems in terms of practicality.
Therefore, it is expected to create an idea that can solve the problems of the conventional technology. Then, it is expected that an air purifier that helps prevent droplet infection or aerosol infection with the above-mentioned new coronavirus will appear.

The following is described in Patent Document 1. That is, the induction electrode is formed of an oxidation-resistant and flexible metal wire, the periphery of the induction electrode is covered with an oxidation-resistant dielectric insulating material, and the outer periphery of the dielectric insulating material is oxidized-resistant. An electrode for generating ozone in which a discharge electrode is formed by spirally winding a thin metal wire.

Patent Document 2 describes the following. That is, two metal substrates having a plurality of through holes are arranged in parallel so that the positions of the through holes coincide with each other, and a voltage is applied between the metal substrates to generate a discharge and the through holes. A method for purifying a fluid by passing a fluid through the plasma, wherein a porous dielectric film by a thermal spraying method is exposed and formed on at least one of the opposing surfaces of the metal substrate. Fluid purification method using. Two metal substrates having a plurality of through holes are arranged in parallel so that the positions of the through holes coincide with each other, and a voltage is applied between the metal substrates to generate an electric discharge, and a fluid is formed in the through holes. A device for purifying a fluid by passing through a plasma, which is characterized in that a porous dielectric film formed by a thermal spraying method is exposed on at least one of the opposing surfaces of the metal substrate. There was a fluid purification device.

Patent Document 3 describes the following. That is, one or more conductor electrodes formed on at least one surface of the upper conductor electrode and the lower conductor electrode, and the upper conductor electrode and the lower conductor electrode facing each other inside the upper conductor electrode and the lower conductor electrode. A protruding portion, a dielectric layer formed on at least one surface of the upper conductor electrode and the lower conductor electrode on the inner side where the upper conductor electrode and the lower conductor electrode face each other, and a substantially uniform thickness. When the upper conductor electrode and the lower conductor electrode are brought into close contact with each other, a predetermined shape is formed between one of the upper and lower conductor electrodes and the dielectric layer or between the opposing dielectric layers due to the protruding effect of the protruding portion of the conductor electrode. (D), and a dielectric layer protruding portion in which a dielectric is formed to a uniform thickness on the upper portion of the conductor electrode protruding portion.
At least one through hole is formed in the upper conductor electrode, the lower conductor electrode, and the dielectric layer so as to penetrate the lower conductor electrode from the upper conductor electrode, and the upper conductor electrode and the lower conductor electrode are pulsed. Alternatively, a dielectric barrier discharge type electrode structure characterized by applying an AC power source to generate plasma.

Patent Document 4 describes the following. That is, in an ion generator in which electrodes facing each other with a cylindrical insulator sandwiched between them are provided and an AC voltage is applied between these electrodes to generate positive and negative ions, H ⁺ (H _{2) is used} as the positive ions. _{O) n} and _O ² as a negative ion - _(effective value 0.44~2.0kV in H 2 _O) ion generator that generates and _n, and the AC in which the frequency outside the range of the human audible frequency band An ion generator characterized in that a voltage is applied.

Patent Document 5 describes the following. That is, it is a device that inactivates the floating virus without capturing it in the air. It is placed in a blower that takes the floating virus into the air passage together with the air and in the air passage through which the floating virus passes, and heats the floating virus. A heating device for processing, a high-pressure electrode for plasma-treating suspended viruses, a ground electrode installed facing the high-pressure electrode, a second electrode composed of a positive electrode and a negative electrode, and a high voltage applied to the high-voltage electrode. A high-pressure power source connected for applying is provided, the air heating temperature by the heating device is set to 30 ° C. or higher, and the heating device, the high-pressure electrode, and the ground contact are in order from the wind side of the air passage. A virus inactivating device, characterized in that an electrode and the second electrode are arranged.

Patent Document 6 describes the following. That is, a plasma panel having a structure in which electrode panels in which at least a part of discharge electrodes is covered with a dielectric material are laminated, and plasma is generated by flowing a gas through a gap between adjacent electrode panels and applying a voltage. An air purifier including a plasma generator including a laminated body and an ozone filter arranged on the downstream side of the plasma generator and having a catalyst for decomposing ozone supported on a catalyst carrier.

Japanese Patent Application Laid-Open No. 09-059004 Patent 4947807 Patent 6315482 Patent 3680120 Patent 5683247 JP-A-2018-110648

Masaaki Nagatsu, Plasma Sterilization, J.M. Plasma Fusion Res. Vol. 83, No. 7 (2007), 601-606 Kazuo Shimizu, Atmospheric Pressure Microplasma Technology for Indoor Environmental Conservation, J.M. Plasma Fusion Res. Vol. 89, No. 3 (2013), 158-163 Itarashiki Asamasa, Oshiro Morisaku, Sakudo Shoichi, Hayashi Shinya, Current Status of Medical Sterilizer Development Using Plasma, J.M. Plasma Fusion Res. Vol. 83, No. 91 (2015), 505-513 Yoshinori Hatta, Gas Discharge (Modern Science), p. 159

However, in the conventional air purifier using plasma, when the object to be sterilized or the object to be treated is a large amount of air, there is a problem that it is difficult to sterilize the air reliably, without leakage and evenly. Further, in addition to the large power consumption, there is a problem that the manufacturing cost is high.
That is, the ozone generation electrode described in Patent Document 1 can generate ozone at a high rate, but the ozone concentration regulation value of the sterilizer using ozone is 0.1 ppm or less, so that the new coronavirus can be sterilized. Is difficult to apply. Moreover, it has a problem of high power consumption.
The plasma-based fluid purification device described in Patent Document 2 has a large pressure loss due to the through hole in an application targeting a large amount of air, and it is necessary to power up the blower, but the capacity will be further increased. Has the problem that it is difficult to deal with. When the diameter of the through hole is increased to reduce the pressure loss, the air to be treated passes outside the plasma generating electric field region, so that there is a problem that the air not treated with plasma passes through.
Similar to the apparatus described in Patent Document 2, the dielectric barrier discharge type electrode structure described in Patent Document 3 has a large pressure loss due to the through hole in an application targeting a large amount of air, and the power of the blower is increased. There is a problem that it is necessary to increase the capacity and it is difficult to cope with further increase in capacity. When the diameter of the through hole is increased, the air to be treated passes outside the electric field region where plasma is generated, as in the apparatus described in Patent Document 2, so that there is a problem that the air not treated with plasma passes through. ..
Since the ion generator described in Patent Document 4 has a structure suitable for ozone generation, that is, a structure in which a pair of mesh electrodes facing each other with a cylindrical insulator sandwiched between them are provided, the dielectric can be made very thin. It is difficult to use and has a problem of high power consumption.
The virus inactivating device described in Patent Document 5 is a method of inactivating a virus by using air heating at a temperature of 30 ° C. or higher and an atmospheric pressure plasma generating electrode, and has a large power consumption of air heating and the electrode structure. Since it is a normal atmospheric discharge electrode, the plasma characteristics become arc discharge and the amount of ozone generated increases. Furthermore, it has a problem that the power consumption is extremely large.
The air purifier described in Patent Document 6 employs a parallel plate electrode in which at least a part of the discharge electrode is covered with a dielectric and an electrode panel is laminated. When the distance between the parallel plate electrodes is narrowed, plasma generation is easy, but the pressure loss in the air flow path is significantly increased. When the interval is widened, the pressure loss of the air flow becomes small, but the plasma generation becomes difficult, and as a result, the power consumption increases, the plasma characteristics become arc discharge, and the ozone generation amount increases. Considering both plasma characteristics and pressure loss suppression, the electrode spacing is about 1 mm to 2 mm. At this interval, there is a problem that the pressure loss is large and the power consumption is large.

In view of the above problems, the present invention can treat a large amount of air to be treated, and plasma sterilization or plasma cleaning treatment can be performed without omission and evenly and reliably when applied to plasma sterilization or air cleaning. It is an object of the present invention to realize that the power consumption is low and the manufacturing cost is low, and it is an object of the present invention to provide a device capable of solving the problem.

The first invention of the present invention for solving the above-mentioned problems connects a suction port for sucking air in a target space to be sterilized or cleaned and an outlet for blowing air to the target space. An air purifier using plasma, comprising a housing for forming an air flow path, a blower for generating the air flow, and a plasma generating means for converting the air into plasma for plasma processing.
The plasma generating means includes an electrically ungrounded non-grounded electrode, a grounded electrode formed of columnar metal and electrically grounded, and a dielectric covering at least one of the non-grounded electrode and the grounded electrode. A film and a plurality of pairs of electrodes paired with each other are provided spatially separated from each other, and an AC power source for applying a voltage between the non-grounded electrode and the ground electrode paired with each other is provided.
The electrode has a Reynolds number Re of about 40 or more, that is, "Reynolds number Re = (air density) x (flow velocity) x (typical size of the cross-sectional shape of the electrode) / (viscosity coefficient)" is approximately It is characterized by having a hydrodynamic condition of being 40 or more.

The second invention is characterized in that, in the first invention, the plurality of pairs of electrodes are arranged in a matrix.

In the third invention, in the first invention or the second invention, the distance between the grounded electrode and the non-grounded electrode is such that the product of the pressure p and the electrode distance d according to Paschen's law is 0.2 to 10 mmHg. It is characterized in that it is in the range of 3 μm to 130 μm, which is a value substantially equal to the condition satisfying cm, that is, p {mmHg} d {cm} = 0.2 to 10 mmHg · cm.

A fourth invention is characterized in that, in any one of the first to third inventions, the ground electrode has a circular or polygonal cross-sectional shape.

A fifth invention is characterized in that, in any one of the first to fourth inventions, some of the ground electrodes are arranged so that the axes of the ground electrodes are orthogonal to each other. ..

A sixth invention is characterized in that, in any one of the first to fourth inventions, the ground electrode has a staggered arrangement in a matrix-like arrangement.

According to a seventh aspect of the present invention, in any one of the first to sixth inventions, the non-grounded electrode is spirally wound around the grounded electrode in close contact with the grounding electrode via the dielectric film. It is characterized by.

An eighth invention is characterized in that, in the seventh invention, the non-grounded electrode is coated with a dielectric film having excellent flexibility and acid resistance.

A ninth aspect of the invention is the invention of any one of the first to sixth aspects, wherein the plasma generating means is a columnar non-grounded electrode having a rectangular cross section coated with the dielectric and the dielectric. A plurality of pairs of electrodes, which are a pair of a covered columnar ground electrode having a rectangular cross section, are formed as one aggregate in a form in which at least one side of each electrode is in close contact with each other. It is characterized in that it is provided spatially separated.

The tenth invention is the mica in which the particle size of the dielectric film formed on the surface of the ground electrode is in the range of about 10 nm to about 65 μm in any one of the first to ninth inventions. (Mica), ferrite, neodymium, silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), manganese oxide (MnO ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), magnesium oxide (MgO) and It is characterized in that at least two or more of the dielectrics of titanium oxide (TiO ₂ ) are contained.

The eleventh invention is the invention of any one of the first to tenth inventions, wherein the AC power supply applies a voltage having a frequency in the audible region between the non-grounded electrode and the grounded electrode. It is a feature.

A twelfth invention is the invention of any one of the first to eleventh inventions, wherein a plurality of non-ground electrodes having a rectangular, trapezoidal, or triangular cross section coated with the dielectric and the dielectric. A plurality of ground electrodes having a rectangular, trapezoidal, or triangular cross section covered with a cross section are arranged alternately and closely on one plane to form one plate-shaped aggregate, and the plate-shaped aggregate is used as the suction port. It is characterized in that a plurality of rectifying plates are arranged near the.

A thirteenth invention is the invention of any one of the first to twelfth inventions, wherein the housing includes the blower, the plasma generating means, and a catalyst for decomposing ozone, and the plasma generating means and the catalyst. The catalyst for decomposing ozone is arranged in this order from the upstream side of the air flow.

A fourteenth invention is characterized in that, in any one of the first to thirteenth inventions, the housing includes cooling fins for cooling air in the flow path.

A fifteenth invention is characterized in that, in any one of the first to fourteenth inventions, the housing includes a humidity adjusting means for adjusting the humidity of air in the flow path.

The apparatus of the present invention has a problem that the conventional apparatus has, that is, when it is applied to sterilization by plasma or air purification, a large amount of air to be treated can be processed, plasma sterilization or purification treatment is not leaked, and it is surely evenly. It has the effect of being able to solve the problems of being possible, consuming less power, and lowering manufacturing costs.
That is, in the apparatus of the present invention, an electrically ungrounded non-grounded electrode, a grounded electrode formed of columnar metal and electrically grounded, and the non-grounded electrode and the grounded electrode are contained in the housing. A plurality of pairs of electrodes, which are a pair of a dielectric film covering at least one of the two electrodes, are arranged spatially separated from each other, and a Kalman vortex or a turbulent flow is generated by the ground electrode to generate plasma and air at a high rate. The effect of stirring and contact mixing is produced. Further, it is a cherry blossom viewing that the Karman vortex or turbulent flow is effectively generated by arranging the non-grounded electrode and the grounded electrode in a matrix. As a result, the plasma and the viruses contained in the air are efficiently and contact-mixed, so that it is possible to reliably sterilize or inactivate the plasma without leakage and evenly.
Further, since the plurality of pairs of electrodes are spatially spaced apart, pressure loss is small and a large amount of air can be treated. Further, since the plurality of pairs of electrodes are of the narrow gap plasma generation method in which the dielectric film is sandwiched, plasma can be generated with low voltage and low power consumption. As a result, it has the effect of solving the conventional problems.
The air purifier using plasma according to the present invention uses plasma to sterilize and purify the air in a partitioned space (sealed space) such as a general household, office, hospital, elderly care facility, restaurant, etc. It can be put into practical use as a device. Its social contribution and industrial value are remarkably great.

FIG. 1 is a schematic external view showing the configuration of an air purifier using plasma according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to the first embodiment of the present invention. FIG. 3 is a schematic perspective view of a first electrode which is a constituent member of a plasma generating means of an air purifier using plasma according to the first embodiment of the present invention. FIG. 4 is a schematic perspective view showing a configuration of an air purifier using plasma according to a second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to the second embodiment of the present invention. FIG. 6 is a schematic perspective view showing an air purifier using plasma according to a third embodiment of the present invention. FIG. 7 is a schematic perspective view (a) and a sectional view (b) showing electrodes which are constituent members of an air purifier using plasma according to a third embodiment of the present invention. FIG. 8 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to a third embodiment of the present invention. FIG. 9 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to a fourth embodiment of the present invention. FIG. 10 is a schematic perspective view (a) and a cross-sectional view (b) showing a rectifying plate which is a constituent member of an air purifier using plasma according to a third embodiment of the present invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In each figure, similar members are designated by the same reference numerals, and redundant description will be omitted.
The present invention is not limited to the following description, and can be appropriately modified without departing from the gist of the present invention. Further, in the drawings shown below, the scale of each member may differ from the actual one for convenience of explanation. In addition, the scale may differ from the actual scale between the drawings.

(First Embodiment)
First, the configuration of the air purifier using plasma according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic external view showing the configuration of an air purifier using plasma according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to the first embodiment of the present invention. FIG. 3 is a schematic perspective view of a first electrode which is a constituent member of a plasma generating means of an air purifier using plasma according to the first embodiment of the present invention.

Reference numeral 1 is a housing. The housing 1 connects the suction port 2a described later and the outlet 2b described later to form an air flow path 2c described later. Inside the housing 1, a first plasma generating means 20 described later and a blower 4 described later are installed. The housing 1 is installed at an arbitrary place in the target space to be sterilized or cleaned, or at a place adjacent to the target space.
Reference numeral 2a is an intake port. The suction port 2a is provided in the housing 1, and the air 2d in the target space, which is the target of the sterilization treatment or the cleaning treatment, is sucked into the housing 1. The suction port 2a has an opening.
Reference numeral 2b is an outlet. The outlet 2b is provided in the housing 1, and blows the air 2d blown from the blower 4 described later to the outside of the housing 1.
Reference numeral 2c is an air flow path. The air flow path 2c functions in cooperation with the blower 4 described later to allow air 2d to flow from the suction port 2a to the outlet 2b while being in contact with the first plasma generating means 20 described later.
Reference numeral 2d is air. The air 2d is sucked into the housing 1 from the suction port 2a, passes through while contacting the first plasma generating means 20 described later, and is blown out from the blowout port 2b. Further, the air 2d is in a state accompanied by Karman vortices or a turbulent flow state due to the first, second, fifth and sixth electrodes 5aa, 5ab, 5ba and 5bb described later.
Reference numeral 4 is a blower. The blower 4 generates a flow of air 2d. The blower 4 functions to blow out the air in the target space, which is the target of the sterilization treatment or the cleaning treatment, from the suction port 2a through the air flow path 3 and from the outlet 2b. The blower here means that the air in the target space to be sterilized or cleaned is sent from the suction port 2a to the housing 1, and the air is plasma-treated by the first plasma generating means 5 described later. After that, when the air is blown into the target space, kinetic energy is applied to the air 2d to generate an air flow. Here, a blower that combines a motor and an impeller is used, but the present invention is not limited to this. As shown in FIG. 2, the blower 4 is installed between the first plasma generating means 20 and the outlet 2b. It may be installed between the suction port 2a and the first plasma generating means 20.

Reference numeral 5aa is the first electrode. As shown in FIGS. 1 and 2, the first electrode 5aa and the second electrode 5ab, which will be described later, are located near the suction port 2a and in a plane parallel to the opening of the suction port 2a. Arranged in parallel. Here, two of the first and second electrodes 5aa and 5ab are arranged, but a large number may be arranged. The distance between the electrodes 5aa and 5ab is substantially the same as, for example, the value obtained by dividing the opening of the suction port 2a into three equal parts.
As shown in FIG. 3, the first electrode 5aa includes an electrically ungrounded non-grounded electrode 7a described later, and an electrically grounded electrode 6a formed of a columnar metal described later and electrically grounded. It is composed of a dielectric film 8a formed so as to cover the ground electrode 6a.
The diameter D of the first electrode 5aa is selected so that the first electrode 5aa causes a Karman vortex or turbulence in the air flowing in from the suction port 2a. The condition for a columnar object placed in a uniform flow to generate a Karman vortex is that the Reynolds number Re is about 40 to about 300, as taught by fluid mechanics. If the Reynolds number Re is approximately 300 or more, turbulence occurs. For example, when the average flow velocity of the air flow inside the housing 1 is 0.5 m / sec and the diameter D of the columnar object is 3 cm, the Reynolds number Re has the following values. It should be noted that 1 Pa = 1 kg / m · s ² .
Reynolds number Re = (air density) x (typical size of object) x (flow velocity) / viscosity coefficient = (1.206 kg / m ³ ) x (0.03 m) x (0.5 m / s) / ( 1.83x10 ^-5 Pa · s) = 990
Here, the diameter D of the first electrode 5aa is, for example, 3 cm. The length of the first electrode 5aa is, for example, 30 cm.
When a Karman vortex is generated in the flow of air 2d by the first electrode 5aa, or when it becomes a turbulent flow, the flow on the wake side of the first electrode 5aa has a flow direction and speed of time. It fluctuates physically and spatially, and the action of stirring the air 2d occurs. When the air 2d is agitated, in general, when the plasma-ized air is accompanied by a vortex or in a turbulent state, the contact mixing of the radicals and air generated by the plasma is promoted. The diffusion of radicals generated in the plasma 5a of the above causes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect.
Here, the flow accompanied by the Karman vortex generated by the first electrode 5aa and the turbulent flow are shown by Ran1 as shown in FIG.

Reference numeral 5ab is a second electrode. As shown in FIGS. 1 and 2, the second electrode 5ab is parallel to the first electrode 5aa in the vicinity of the suction port 2a and in a plane parallel to the opening of the suction port 2a. Is placed. Here, two of the first and second electrodes 5aa and 5ab are arranged, but a large number may be arranged. The distance between the electrodes 5aa and 5ab is substantially the same as, for example, the value obtained by dividing the opening of the suction port 2a into three equal parts. The diameter D of the second electrode 5ab is the same as that of the first electrode 5aa.
Like the first electrode 5aa, the second electrode 5ab is an electrically ungrounded non-grounded electrode 7b, a grounding electrode 6b formed of a columnar metal and electrically grounded, and a grounding electrode 6b. It is composed of a dielectric film 8b formed so as to cover the above.
The diameter D of the second electrode 5ab is selected to have a size that causes the second electrode 5ab to cause a Karman vortex or turbulence in the air flowing in from the suction port 2a, similarly to the first electrode. The condition for a columnar object placed in a uniform flow to generate a Karman vortex is that the Reynolds number Re is about 40 to about 300, as taught by fluid mechanics. If the Reynolds number Re is approximately 300 or more, turbulence occurs.
In general, when the air to be plasma is accompanied by a vortex or in a turbulent state, the contact mixing of the lycals generated by the plasma and the air is promoted, so that the radicals generated in the plasma 5a described later are promoted. Diffusion becomes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect.
Here, the flow accompanied by the Karman vortex generated by the second electrode 5ab and the turbulent flow are shown by Ran1 as shown in FIG.

Reference numeral 5ba is a fifth electrode. As shown in FIGS. 1 and 2, the fifth electrode 5ba is spatially separated in a plane substantially parallel to the plane on which the first and second electrodes 5aa and 5ab are arranged. Will be installed. Then, the axis of the fifth electrode 5ba is set so as to have a positional relationship orthogonal to the axis of each of the first and second electrodes 5aa and 5ab. The diameter D of the fifth electrode 5ba is the same as that of the first electrode 5aa.
When the axes of the fifth electrode 5ba and the axes of the first and second electrodes 5aa and 5ab are set so as to be orthogonal to each other, the fifth electrode 5ba is generated. The stirring action of air 2d due to Karman vortex or turbulent flow becomes stronger.
Like the first electrode 5aa, the fifth electrode 5ba includes an electrically ungrounded non-grounded electrode 7e, a grounding electrode 6e formed of a columnar metal and electrically grounded, and a grounding electrode 6e. It is composed of a dielectric film 8e formed so as to cover the above.
Reference numeral 5bb is a sixth electrode. As shown in FIGS. 1 and 2, the sixth electrode 5bb is spatially separated in a plane substantially parallel to the plane on which the first and second electrodes 5aa and 5ab are arranged. Will be installed. Then, the axis of the sixth electrode 5bb is set so as to have a positional relationship orthogonal to the axis of each of the first and second electrodes 5aa and 5ab. The diameter D of the sixth electrode 5bb is the same as that of the first electrode 5aa.
When the axes of the sixth electrode 5bb and the axes of the first and second electrodes 5aa and 5ab are set so as to be orthogonal to each other, the sixth electrode 5bb is generated. The stirring action of air 2d due to Karman vortex or turbulent flow becomes stronger.
Like the first electrode 5aa, the sixth electrode 5bb includes an electrically ungrounded non-grounded electrode 7f, a grounded electrode 6f formed of a columnar metal and electrically grounded, and a grounding electrode 6f. It is composed of a dielectric film 8f formed so as to cover the above. The diameter D of the sixth electrode 5bb is the same as that of the first electrode 5aa.

The symbol Ran1 is turbulent. As shown in FIG. 2, the turbulent flow Ran1 is a vortex or turbulent flow generated around the first and second electrodes 5aa and 5ab, and varies randomly in time and space. That is, the airflow that has passed around the first and second electrodes 5aa and 5ab has the property that the direction and speed of the flow fluctuate temporally and spatially and flow to the entire region inside the housing 1. Become Ran1. Since the turbulent air 2d flows in all directions, it is inside the region where the dielectric barrier discharge narrow gap plasma 5a, which will be described later, is generated by the fifth and sixth electrodes 5ba and 5bb. It actively invades and moves while contacting and mixing with plasma. Further, the diffusion of radicals generated in the plasma 5a becomes turbulent diffusion, which has an effect of enhancing the plasma sterilization effect. That is, the turbulent flow Ran1 contacts and mixes the plasma 5a and the air 2d at a high rate.
The symbol Ran2 is turbulent. The turbulent flow Ran2 is an airflow in which the turbulent flow Ran1 hits the fifth and sixth electrodes 5ba and 5bb, and vortices or turbulence are added. Since the air 2d that has become turbulent Ran2 flows in all directions, it moves while contacting and mixing with radicals generated by the dielectric barrier discharge narrow gap plasma 5a described later. Further, the diffusion of radicals generated in the plasma 5a becomes turbulent diffusion, which has an effect of enhancing the plasma sterilization effect. That is, the turbulent flow Ran2 contacts and mixes the plasma 5a and the air 2d at a high rate.

Reference numeral 6a is a ground electrode. The ground electrode 6a is electrically grounded. The ground electrode 6a has, for example, a circular cross-sectional shape. Further, the surface of the ground electrode 6a is uniformly coated with the dielectric film 8a described later. Then, the non-grounded electrode 7a, which will be described later, is brought into close contact with the dielectric film 8a and is spirally wound. An AC voltage is applied between the non-grounded electrode 7a and the grounding electrode 6a from the AC power supply 9 described later.
Reference numeral 7a is a non-grounded electrode. The non-grounded electrode 7a is electrically non-grounded. The non-grounded electrode 7a has a linear or band shape, and is wound around the grounding electrode 6a in close contact with the dielectric film 8a. Here, as shown in FIG. 3, the non-grounded electrode 7a is spirally wound in close contact with the dielectric film 8a so as to be wound around the ground electrode 6a.
For the non-grounded electrode 7a, a covered electric wire having a small diameter, for example, an enamel wire, a formal wire, a polyurethane wire, or a polyester wire having a diameter of about 50 μm to 500 μm is used. Since the non-grounded electrode 7a is exposed to plasma, it is preferable to coat it with a dielectric film having excellent flexibility and acid resistance. Further, a bare wire may be used as long as it is a metal having excellent flexibility and acid resistance.
The distance between the non-grounded electrode 7a and the grounded electrode 6a should be short. The gap between the electrodes 6a and 7a should be as narrow as possible.
In order to generate a dielectric barrier discharge plasma using the non-grounded electrode 7a and the grounded electrode 6a at a low voltage, for example, according to Non-Paschen's Law, the product of the pressure p and the electrode spacing d according to Paschen's law is It is better to select the condition of 0.2 to 10 mmHg · cm. The conditions for generating plasma at a low voltage are as follows. The distance (gap) d between the electrodes 6a and 7a is set.
d {cm} = 0.2 to 10 mmHg · cm / p {mmHg}
= 0.2 to 10 mmHg · cm / 760 {mmHg}
It is preferable to select from 3 μm to 130 μm, which is a value substantially equal to the condition satisfying the condition.

Reference numeral 8a is a dielectric film. The dielectric film 8a is uniformly formed in close contact with the surface of the ground electrode 6a. A dielectric is used as the material of the dielectric film 8a.
When the dielectric film 8a is coated on the surface of the ground electrode 6a and an AC voltage is applied between the ground electrode 6a and the non-ground electrode 7a, plasma is generated. This is a discharge phenomenon called a dielectric barrier discharge narrow gap plasma, and has a special feature.
In the case of the first, second, fifth and sixth electrodes 5aa, 5ab, 5ba and 5bb, a dielectric barrier discharge narrow gap plasma 5a is generated as shown in FIG.
The conditions for generating the dielectric barrier discharge narrow gap plasma 5a and its characteristics are listed below.
(A) The distance between the non-grounded electrode 7a and the grounded electrode 6a is preferably in the range of 3 μm to 130 μm according to Paschen's law.
(B) The surface of one or both of the ground electrode 6a and the non-ground electrode 7a is coated with a dielectric film. That is, it is only necessary to coat the ground electrode 6a with the dielectric film, or to cover the non-ground electrode 7a with the dielectric film. Alternatively, both the ground electrode 6a and the non-ground electrode 7a may be coated with a dielectric film.
(C) Dielectric barrier The voltage and power for generating discharge plasma strongly depend on the thickness of the dielectric (thickness in the electric field direction). In general, the thinner the film, the less power is consumed for generating the dielectric barrier discharge plasma. Since the electric field strength E (V / cm) = the applied voltage V (V) / the distance between the electrodes d (cm), when the distance d between the electrodes is short, the electric field strength E (V / cm) becomes large and the plasma Occurs easily.
(D) The thickness of the dielectric film 8a is preferably uniform. However, the unevenness optically called a rough surface is useful for centralizing the electric field.
(E) The voltage applied between the ground electrode 6a and the non-ground electrode 7a is an AC voltage. It may be a pulse voltage (the pulse waveform is a composite of sinusoidal waves of many frequencies). In the dielectric barrier discharge plasma, a dielectric is interposed at at least one of both electrodes, and polarization, which is a phenomenon peculiar to the dielectric, plays an important role. When an AC voltage is applied between the ground electrode 6a and the non-ground electrode 7a, an electric field (unit: V / cm) is generated between both electrodes 6a and 7a, and the electric field causes polarization in the dielectric film. .. According to condensed matter physics, there are four types of polarization: electronic polarization, ionic polarization, orientation polarization, and interfacial polarization, which depend on the frequency of the applied voltage. Charges are accumulated on the surface and inside of the dielectric due to the polarization phenomenon. The current and voltage values required to generate and maintain the dielectric barrier discharge are greatly affected by the accumulated charge. Further, the value of the non-dielectric constant of the dielectric film affects the generation and maintenance of the dielectric barrier discharge plasma. Since interfacial polarization occurs at a frequency of several kHz or less, an audible frequency is good to utilize this.

In the application of the conventional atmospheric pressure dielectric barrier discharge plasma, since the distance between the electrodes is set to about 1 mm or more, the applied voltage becomes high, heat is generated, and the power consumption becomes large.
Here, in consideration of the above (a) to (e), as the dielectric film 8a, mica (mica), ferrite, neodymium, silicon oxide (SiO ₂ ) having a particle size in the range of about 10 nm to about 65 μm, A thin film is formed by selecting at least two or more dielectrics of aluminum oxide (Al ₂ O ₃ ), manganese oxide (MnO ₂ ), zinc oxide (ZnO), magnesium oxide (MgO) and titanium oxide (TIO ₂ ). ..
The dielectric film 8a is formed by, for example, a sol-gel method. For example, a particulate dielectric material as a raw material is mixed with a plasticizer and a solvent to form a slurry, which is applied as a film on the ground electrode 6a. Then, the method of drying and firing is performed.
The method for forming the dielectric film 8a is not particularly limited. Further, a film forming method in which bubbles are not formed in the dielectric film 8a is preferable.
Further, when the particle size of the particulate dielectric material used as the raw material of the dielectric film 8a is larger than about 65 μm, the electrode spacing d = 130 μm in consideration of Paschen's law exceeds about 1/2, so that the film quality is deteriorated. There is a risk of inviting. Further, fine particles having a particle size of 10 nm or more can be easily and inexpensively entered from a fine particle manufacturer. Further, the dielectric constant of the dielectric material is preferably large because the amount of accumulated charges between the grounded electrode 6a and the non-grounded electrode 7a increases.

Reference numeral 9 is an AC power supply. The AC power supply 9 generates a sinusoidal voltage of, for example, 2 kHz in an audible region (approximately 20 kHz or less) and applies it between the ground electrode 6a and the non-ground electrode 7a. The AC power supply 9 may output a pulsed waveform voltage instead of a sinusoidal voltage. Here, the output voltage of the AC power supply 9 has an amplitude value in the range of about 10 V to 2 kV. The average current depends on the area of the electrode, but is in the range of about 5 mA to 10 A. The frequency of the power supply may be a commercial frequency (50 Hz or 60 Hz) to 20 kHz in the audible range.
When the frequency is about 20 kHz or less, four polarizations of the dielectric, that is, electron polarization, ionic polarization, orientation polarization, and interfacial polarization are easily generated, which is preferable from the viewpoint of increasing the accumulated charge. The peak value of the voltage is generally in the range of about 500V to 2kV. The average current depends on the area of the electrode, but is generally in the range of about 20 mA to 10 A. The frequency of the power supply may be any band in the region from low frequency to ultra-high frequency such as 1 kHz to 1000 MHz, but a frequency in a band of about 10 kHz to 100 kHz is preferable in consideration of an increase in electrode temperature and the like. The peak value of the voltage is generally in the range of about 500V to 2kV. The average current depends on the area of the electrode, but is generally in the range of about 20 mA to 10 A. The frequency of the power supply may be any band in the region from low frequency to ultra-high frequency such as 1 kHz to 1000 MHz, but a frequency in a band of about 10 kHz to 100 kHz is preferable in consideration of an increase in electrode temperature and the like.
Reference numerals 10a and 10b are first and second feeder lines. The first and second feeder lines 10a and 10b are used in combination with the first and second terminals 11a and 11b described later and the first and second introduction lines 12a and 12b described later, and are the outputs of the AC power supply 9. A voltage is applied between the grounded electrode 6a and the non-grounded electrode 7a. The first feeder line 10a connects the AC power supply 9 and the first terminal 11a. The second feeder line 10b connects the AC power supply 9 and the second terminal 11b.
Reference numerals 11a and 11b are first and second terminals. The first terminal 11a connects the first feeder line 10a and the first introduction line 12a described later. The second terminal 11b connects the second feeder line 10b and the second introduction line 12b described later.
Reference numerals 12a and 12b are first and second introduction lines. The first introduction line 12a connects the non-grounded electrode 7a and the first terminal 11a. The second introduction line 12b connects the ground electrode 6a and the second terminal 11b.

Here, power is supplied to the first, second, fifth, and sixth electrodes 5aa, 5ab, 5ba, and 5bb, and the first, second, fifth, and sixth electrodes 5aa, 5ab, 5ba, and 5bb. A set of plasma generating means including an AC power source 9 and first and second feeder lines 10a and 10b, first and second terminals 11a and 11b, and first and second introduction lines 12a12b. It is called the plasma generating means 20 of the above.

In FIG. 3, reference numeral 5a is a dielectric barrier discharge narrow gap plasma. In the dielectric barrier discharge narrow gap plasma 5a, as shown in FIG. 3, a high voltage of the AC power supply 9 is applied between the ground electrode 6a coated with the dielectric film 8a and the non-ground electrode 7a, and both electrodes 6a , 7a is generated when the electric field reaches the discharge start voltage.
When the dielectric barrier discharge narrow gap plasma 5a is generated, positive ions, negative ions, ultraviolet rays, active oxygen (O radical, OH radical, etc.), active nitrogen (N radical, NO radical, etc.), ozone, etc. are generated, and plasma chemistry Promotes reactions and plasma physical reactions.
When the dielectric barrier discharge narrow gap plasma 5a is generated, the bacteria and viruses existing therein are almost certainly killed or inactivated by the plasma chemical reaction effect and the plasma physical reaction effect. It is known that sterilization or sterilization by plasma has a strong sterilization effect, and for example, as shown in Non-Patent Documents 1 to 3, it is possible to kill or sterilize almost 100% within a few seconds. There is.
That is, when the new coronavirus is mixed with the air 2d and is mixed with the turbulent flow Ran1 and the turbulent flow Ran2 from the suction port 2a and transported to the vicinity of the first plasma generating means 20, the new type coronavirus is mixed with the air 2d. It is converted to plasma. As a result, it is sterilized or inactivated within approximately a few seconds. The fact that the new coronavirus is sterilized or inactivated within approximately a few seconds is one of the great merits regarding the application of the dielectric barrier discharge narrow gap plasma 5a to an indoor air linear device.

In the air purifier, various methods other than the plasma method are adopted. However, they have little practical value because they take a long time to sterilize (exposure time). The sterilization method using ultraviolet light is dangerous to the eyes (inducing cataracts, pterygium, etc.) and requires an irradiation time of several tens of seconds to 60 seconds or more. The photocatalytic method requires a treatment time of several tens of minutes or more, and its bactericidal effect is very gentle. Since ozone is harmful to the human body, the sterilization method using ozone uses a low concentration of ozone, so that the sterilization effect is very mild.
It is well known that ozone can inactivate the new coronavirus. For example, there is a finding that the new coronavirus can be inactivated by exposing the new coronavirus to ozone having a concentration of 6.0 ppm for about 1 hour. However, since ozone is harmful to the human body, it is dangerous to release high-concentration ozone into the room during application.
As is well known, ozone is a very unstable substance with strong oxidizing power and high reactivity, and exhibits strong toxicity when its concentration is high. Since it is difficult to be absorbed by water, when it is taken into the respiratory system, it reaches the deep part of the lung and causes respiratory disorders (pulmonary edema, etc.). An odor is felt at an ozone concentration of 0.01 to 0.02 ppm. A strong odor is felt at an ozone concentration of 0.1 ppm, and the nose and throat are irritated. At an ozone concentration of 0.2 to 0.5 ppm for 3 to 6 hours, symptoms of visual impairment appear. At an ozone concentration of 1-2 ppm, a person will have headache, chest pain, thirst and cough in the upper airways in 2 hours. At an ozone concentration of 5 to 10 ppm, the pulse increases and the symptoms of emphysema appear. Small animals die within 2 hours at an ozone concentration of 15-20 ppm. In Japan, the Japan Society for Occupational Health and the Central Occupational Accident Prevention Association have defined 0.1 ppm as the controlled concentration in the working environment.

Next, a method for sterilizing or inactivating enveloped viruses such as the new type coronavirus and influenza virus floating in the air will be described using the air purifier using plasma according to the first embodiment of the present invention. .. Here, for example, the target space is 6 tatami mats of a Japanese house. The space volume between 6 tatami mats is 3.6mx 2.7mx height 2.4m = 23.3m ³ .
The air contained in the 6 tatami mats is sucked into an air purifier using the virus according to the first embodiment of the present invention with an air volume capable of sterilizing in 10 minutes, and the plasma-treated air is blown out. Explain that it sterilizes or inactivates enveloped viruses such as new corona virus and influenza virus contained in the air.
The blowing capacity of the blower, which is a component of the air purifier using plasma according to the first embodiment of the present invention, is, for example, 2.33 m ³ / min. The size of the housing 1 is, for example, 30 cm x 30 cm x 50 cm in terms of internal dimensions.
The area of the entrance 2a of the housing 1 is, for example, approximately 900 cm ² (for example, an opening of 30 cm in length × 30 cm in width).
The diameters and lengths of the first and second electrodes 5aa and 5ab, and the fifth and sixth electrodes 5ba and 5bb are, for example, 3 cm and 30 cm, respectively. The first and second electrodes 5aa and 5ab are installed, for example, at a distance of about 10 cm from the suction port 2a, for example, at a position about 5 cm away. The fifth and sixth electrodes 5ba and 5bb are installed on the wake side from the positions of the first and second electrodes 5aa and 5ab, for example, at a position approximately 43 cm away. The blower 4 is installed on the wake side, for example, at a position approximately 10 cm away from the positions of the second and fourth electrodes 5ba and 5bb.
The average flow velocity inside the housing 1 is approximately 43 cm / sec. It should be noted that the value calculated from the relational expression of the air volume (Q: m ³ / min), the cross-sectional area of the housing 1 (S: m ² ), and the average flow velocity (v: m / sec), Q = S · v. is there. However, the cross-sectional area S 30cmx0cm = 900cm ^2, air volume Q was set to 23.3 m ^3/10 min.
In this case, Reynolds number Re = (air density) x (typical size of object) x (flow velocity) / viscosity coefficient = (1.206 kg / m ³ ) x (0.03 m) x (0.43 m / s) ^{) / (1.83x10 -5 Pa · s} ) = 850, it is.
Air 2d containing enveloped viruses such as the new coronavirus and influenza virus passes through the inside of the housing 1 at an average flow velocity of about 43 cm / sec, so that the first and second electrodes 5aa, 5ab, and the fifth and sixth electrodes are used. The time to pass through the region sandwiched between the electrodes 5ba and 5bb of the virus is about 1 second. During that time, the region of the dielectric barrier discharge narrow gap plasma 5a generated by the first and second electrodes 5aa and 5ab and the dielectric barrier discharge narrow gap plasma 5a generated by the fifth and sixth electrodes 5ba and 5bb Pass through the area of. That is, it is exposed twice to the region of the dielectric barrier discharge narrow gap plasma 5a. Further, the air 2d containing an enveloped virus such as a new type coronavirus or an influenza virus is caused by plasma generation existing in a region sandwiched between the first and second electrodes 5aa and 5ab and the fifth and sixth electrodes 5ba and 5bb. Contact and mix with radicals.

First, the air purifier using plasma according to the first embodiment of the present invention is installed at an arbitrary place between 6 tatami mats, which is the target space.
Next, the blower 4 is operated, and the air between the 6 tatami mats is sucked into the housing 1 and blown out. Then, the voltage of the AC power supply 9 is set to a predetermined value and operated. As for the operating conditions such as the voltage and current of the AC power supply 9, when the plasma generating means 20 is attached to the housing 1, the relationship between the voltage, current and the amount of ozone generated is grasped as data in advance, and the data is used. Evaluate and analyze to select the optimum conditions. When acquiring the above data, it is desirable to carry out an experiment with an ozone concentration regulation value of 0.01 ppm or less.
Non-grounded electrode 7a and grounded electrode 6a from the AC power supply 9 via the first and second feeder lines 10a and 10b, the first and second terminals 11a and 11b, and the first and second introduction lines 12a and 12b. When a voltage is applied between the above, a dielectric barrier discharge narrow gap plasma 5a is generated as shown in FIG.
When the dielectric barrier discharge narrow gap plasma 5a is generated, enveloped viruses such as the new corona virus and influenza virus become positive ions, negative ions, ultraviolet rays, active oxygen (O radicals, OH radicals, etc.), as described above. It is almost certainly killed or inactivated by plasma chemical reactions such as active nitrogen (N radicals, NO radicals, etc.) and ozone, and plasma physical reactions.
In the air purifier using plasma according to the first embodiment of the present invention, the air 2d to be treated with plasma is exposed twice to the region of the dielectric barrier discharge narrow gap plasma 5a, so that a plasma sterilization effect is expected. it can. Further, the air 2d containing an enveloped virus such as a new type coronavirus or an influenza virus is caused by plasma generation existing in a region sandwiched between the first and second electrodes 5aa and 5ab and the fifth and sixth electrodes 5ba and 5bb. Since it is in contact with and mixed with radicals, a plasma sterilizing effect can be expected.
The operation of the air purifier using plasma according to the first embodiment of the present invention can be arbitrarily performed, such as constant operation or operation at a predetermined time zone.

As shown in the above description, the plasma-based air purifier according to the first embodiment of the present invention includes the first and second electrodes 5aa and 5ab and the fifth and sixth electrodes 5ba and 5bc. The Kalman vortex or turbulent flow generated by the above-mentioned first and second electrodes 5aa and 5ab effectively contact the plasma generated by the fifth and sixth electrodes 5ba and 5bc with the air to be processed. It is possible to mix. Further, the air 2d to be treated can be effectively agitated by Karman vortex or turbulent flow in the region sandwiched between the first and second electrodes 5aa and 5ab and the fifth and sixth electrodes 5ba and 5bb. Is.
As a result, the sterilization target or the purification target contained in the air is reliably and evenly contact-mixed with the plasma, and plasma sterilization is effectively possible.
Moreover, since the plurality of pairs of electrodes are spatially separated from each other, there is little pressure loss and a large amount of air can be treated. Further, since the plurality of pairs of electrodes are of the narrow gap plasma generation method in which the dielectric film is sandwiched, plasma can be generated with low voltage and low power consumption. As a result, it has the effect of solving the conventional problems.
The air purifier using plasma according to the first embodiment of the present invention sterilizes and purifies the air in a partitioned space (sealed space) such as a general household, office, hospital, elderly care facility, restaurant, etc. It is possible to put it into practical use as an air purifier using plasma. Its social contribution and industrial value are remarkably great.

(Second Embodiment)
Next, the air purifier using plasma according to the second embodiment of the present invention will be described with reference to FIGS. 4 and 5. See also FIGS. 1 to 3.
First, the configuration of the atmospheric pressure plasma sterilization processing apparatus according to the second embodiment of the present invention will be described.
FIG. 4 is a schematic perspective view showing a configuration of an air purifier using plasma according to a second embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to the second embodiment of the present invention.

Reference numerals 5aa and 5ab are electrodes similar to the first and second electrodes shown in FIG.
Reference numeral 5ac is a third electrode. As shown in FIG. 4, the third electrode 5ac is spatially arranged in a plane parallel to the opening of the suction port 2a along with the first, second, and fourth electrodes 5aa, 5ab, and 5ad described later. Are placed apart from each other. Similar to the first electrode 5aa, the third electrode 5ac includes an electrically ungrounded non-grounded electrode 7c, a grounding electrode 6c made of columnar metal and electrically grounded, and a grounding electrode 6c. It is composed of a dielectric film 8c formed so as to cover it.
As for the diameter D of the third electrode 5ac, the size at which the third electrode 5ac causes a Karman vortex or turbulence in the air flowing in from the suction port 2a is selected in the same manner as in the first electrode 5aa. The condition for a columnar object placed in a uniform flow to generate a Karman vortex is that the Reynolds number Re is about 40 to about 300, as taught by fluid mechanics. If the Reynolds number Re is approximately 300 or more, turbulence occurs.
In general, when the air to be plasma is accompanied by a vortex or in a turbulent state, the contact mixing of the lycals generated by the plasma and the air is promoted, so that the radicals generated in the plasma 5a described later are promoted. Diffusion becomes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect. Here, the flow accompanied by the Karman vortex generated by the third electrode 5ac and the turbulent flow are shown by Ran1 as shown in FIG.
Reference numeral 5ad is a fourth electrode. As shown in FIG. 4, the fourth electrode 5ad is spatially separated along with the first, second and third electrodes 5aa, 5ab and 5ac in a plane parallel to the opening of the suction port 2a. Is placed. Like the first electrode 5aa, the fourth electrode 5ad includes an electrically ungrounded non-grounded electrode 7d, a grounded electrode 6d formed of a columnar metal and electrically grounded, and a grounded electrode 6d. It is composed of a dielectric film 8d formed so as to cover the above.
The diameter D of the fourth electrode 5ad is selected to have a size that causes the fourth electrode 5ad to cause a Karman vortex or turbulence in the air flowing in from the suction port 2a, similarly to the first electrode 5aa. The condition for a columnar object placed in a uniform flow to generate a Karman vortex is that the Reynolds number Re is about 40 to about 300, as taught by fluid mechanics. If the Reynolds number Re is approximately 300 or more, turbulence occurs.
In general, when the air to be plasma is accompanied by a vortex or in a turbulent state, the contact mixing of the lycals generated by the plasma and the air is promoted, so that the radicals generated in the plasma 5a described later are promoted. Diffusion becomes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect. Here, the flow accompanied by the Karman vortex generated by the fourth electrode 5ad and the turbulent flow are shown by Ran1 as shown in FIG.

Here, the arrangement form of the electrodes shown in FIGS. 4 and 5 is referred to as a matrix-like arrangement. The first row in the matrix arrangement of the first, second, third and fourth electrodes 5aa, 5ab, 5ac and 5ad in a plasma-based air purifier according to a second embodiment of the present invention. It is called an electrode located in.

Reference numerals 5ba and 5bb are electrodes similar to the fifth and sixth electrodes shown in FIG.
Reference numeral 5bc is a seventh electrode. As shown in FIG. 4, the seventh electrode 5bc is spatially arranged in a plane parallel to the opening of the suction port 2a, along with the fifth, sixth, and eighth electrodes 5ba, 5bb, and 5bd described later. Are placed apart from each other. The fifth, sixth, seventh and eighth electrodes 5ba, 5bb, 5bc and 5bd described later have their axes of the first, second, third and fourth electrodes 5aa, 5ab, 5ac and 5ad, respectively. It is arranged so as to be orthogonal to the axis of.
Similar to the first electrode 5aa, the seventh electrode 5bc includes an electrically ungrounded non-grounded electrode 7g, a grounding electrode 6g formed of a columnar metal and electrically grounded, and a grounding electrode 6g. It is composed of 8 g of a dielectric film formed so as to cover the above.
As for the diameter D of the seventh electrode 5bc, similarly to the first electrode 5aa, the size at which the seventh electrode 5bc causes a Karman vortex or turbulence in the air flowing in from the suction port 2a is selected. The condition for a columnar object placed in a uniform flow to generate a Karman vortex is that the Reynolds number Re is about 40 to about 300, as taught by fluid mechanics. If the Reynolds number Re is approximately 300 or more, turbulence occurs.
In general, when the air to be plasma is accompanied by a vortex or in a turbulent state, the contact mixing of the lycals generated by the plasma and the air is promoted, so that the radicals generated in the plasma 5a described later are promoted. Diffusion becomes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect. Here, the flow accompanied by the Karman vortex generated by the seventh electrode 5bc and the turbulent flow are shown by Ran2 as shown in FIG.
When the axis of the seventh electrode 5bc and the axis of the first and second electrodes 5aa and 5ab are set so as to be orthogonal to each other, the seventh electrode 5bc is generated. The stirring action of air 2d due to Karman vortex or turbulent flow becomes stronger.

Reference numeral 5bd is the eighth electrode. As shown in FIG. 4, the eighth electrode 5bd is spatially separated from the fifth, sixth, and seventh electrodes 5ba, 5bb, and 5bc in a plane parallel to the opening of the suction port 2a. Is placed.
Like the first electrode 5aa, the eighth electrode 5bd includes an electrically ungrounded non-grounded electrode 7h, a grounding electrode 6h formed of a columnar metal and electrically grounded, and a grounding electrode 6h. It is composed of a dielectric film 8h formed so as to cover the above.
The diameter D of the eighth electrode 5bd is selected to have a size that causes the eighth electrode 5bd to cause a Karman vortex or turbulence in the air flowing in from the suction port 2a, similarly to the first electrode 5aa. The condition for a columnar object placed in a uniform flow to generate a Karman vortex is that the Reynolds number Re is about 40 to about 300, as taught by fluid mechanics. If the Reynolds number Re is approximately 300 or more, turbulence occurs.
In general, when the air to be plasma is accompanied by a vortex or in a turbulent state, the contact mixing of the lycals generated by the plasma and the air is promoted, so that the radicals generated in the plasma 5a described later are promoted. Diffusion becomes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect. Here, the flow accompanied by the Karman vortex generated by the eighth electrode 5bc and the turbulent flow are shown by Ran2 as shown in FIG.
When the axis of the eighth electrode 5bd and the axis of the first and second electrodes 5aa and 5ab are set so as to be orthogonal to each other, the eighth electrode 5bd is generated. The stirring action of air 2d due to Karman vortex or turbulent flow becomes stronger.

Here, the arrangement form of the electrodes shown in FIGS. 4 and 5 is referred to as a matrix-like arrangement. The second row in the matrix arrangement of the fifth, sixth, seventh and eighth electrodes 5ba, 5bb, 5bc, 5bd in the plasma-based air purifier according to the second embodiment of the present invention. It is called an electrode located in.

Reference numeral 5ca is a ninth electrode. As shown in the ninth electrode 5ca and FIG. 4, spatially, along with the tenth, eleventh, and twelfth electrodes 5cc, 5cc, and 5cd described later, in a plane parallel to the opening of the suction port 2a. They are placed apart. The axes of the ninth, tenth, eleventh and twelfth electrodes 5ca, 5cc, 5cc and 5cd are the axes of the first, second, third and fourth electrodes 5aa, 5ab, 5ac and 5ad, respectively. Arranged so as to be parallel to the heart.
Similar to the first electrode 5aa, the ninth electrode 5ca includes an electrically ungrounded non-grounded electrode 7i, a grounding electrode 6i formed of a columnar metal and electrically grounded, and a grounding electrode 6i. It is composed of a dielectric film 8i formed so as to cover the above.
As for the diameter D of the ninth electrode 5ca, similarly to the first electrode 5aa, the size at which the ninth electrode 5ca causes a Karman vortex or turbulence in the air flowing in from the suction port 2a is selected.
In general, when the air to be plasma is accompanied by a vortex or in a turbulent state, the contact mixing of the lycals generated by the plasma and the air is promoted, so that the radicals generated in the plasma 5a described later are promoted. Diffusion becomes turbulent diffusion, which has the effect of enhancing the plasma sterilization effect. Here, a flow accompanied by a Karman vortex generated by the ninth electrode 5ca and a turbulent flow are shown by Ran3 as shown in FIG.
Reference numerals 5cc, 5cc and 5cd are tenth, eleventh and twelfth electrodes. The tenth, eleventh, and twelfth electrodes 5cc, 5cc, and 5cd have the same structure as the ninth electrode, and their diameter D is the same as that of the ninth electrode.

Here, the arrangement form of the electrodes shown in FIGS. 4 and 5 is referred to as a matrix-like arrangement. The third row in the matrix-like arrangement of the ninth, tenth, eleventh and twelfth electrodes 5ca, 5cc, 5cc and 5cd in the matrix-like arrangement of the air purifier using plasma according to the second embodiment of the present invention. It is called an electrode located in.

Further, here, the first to twelfth electrodes 5aa, 5ab, 5ac, 5ad, 5ba, 5bb, 5bc, 5bd, 5ca, 5cc, 5cc, and 5cd shown in FIGS. A set of plasma generating means including an AC power source 9 for supplying the first and second feeding lines 10a and 10b, first and second terminals 11a and 11b, and first and second introduction lines 12a and 12b. Is called the second plasma generating means 21.
When a high voltage is applied between the non-grounded electrode 7 and the grounded electrode 6 from the AC power source 9 in the second plasma generating means 21, a dielectric barrier discharge plasma 5a is generated as shown in FIG.

Reference numeral 17 is an ozone decomposition catalyst. The ozone decomposition catalyst 17 is arranged between the second plasma generating means 21 and the outlet 2b, decomposes ozone, and transforms it into safe oxygen. Since a small amount of ozone is generated by the second plasma generating means 21, the ozone is decomposed and transformed into oxygen. As a result, the ozone does not leak to the outside of the housing 1. As the ozone decomposition catalyst 17, a commercially available catalyst such as activated carbon, manganese dioxide, or nickel oxide may be used. It may be a plasma-assisted catalyst.

Next, a method for sterilizing or inactivating enveloped viruses such as the new type coronavirus and influenza virus floating in the air will be described using the air purifier using plasma according to the second embodiment of the present invention. ..
Here, for example, the target space is 6 tatami mats of a Japanese house. The space volume between 6 tatami mats is 3.6mx 2.7mx height 2.4m = 23.3m ³ .
The air contained in the 6 tatami mats is sucked into an air purifier using the virus according to the second embodiment of the present invention with an air volume capable of sterilizing in 10 minutes, and the plasma-treated air is blown out. Explain that it sterilizes or inactivates enveloped viruses such as new corona virus and influenza virus contained in the air.

The blowing capacity of the blower, which is a component of the air purifying device using plasma according to the second embodiment of the present invention, is, for example, 2.33 m ³ / min. The size of the housing 1 is, for example, 30 cm x 30 cm x 100 cm in terms of internal dimensions.
The area of the entrance 2a of the housing 1 is, for example, approximately 900 cm ² (for example, an opening of 30 cm in length × 30 cm in width).
In FIG. 4, the diameters and lengths of the first to twelfth electrodes 5aa, 5ab, 5ac, 5ad, 5ba, 5bb, 5bc, 5bd, 5ca, 5cab, 5cc, and 5cd are, for example, 3 cm and 30 cm, respectively. ..
The first to fourth electrodes 5aa, 5ab, 5ac, and 5ad are installed in parallel, for example, at intervals of about 6 cm in a plane separated from the suction port 2a, for example, by about 5 cm.
The fifth to eighth electrodes 5ba, 5bb, 5bc, and 5bd are parallel to the wake side from the positions of the first to fourth electrodes 5aa, 5ab, 5ac, and 5ad, for example, approximately 21.5 cm away. Will be installed. The axes of the fifth to eighth electrodes 5ba, 5bb, 5bc, and 5bd are arranged 90 degrees apart from the axes of the first to fourth electrodes 5aa, 5ab, 5ac, and 5ad. That is, the axes of the fifth to eighth electrodes 5ba, 5bb, 5bc, and 5bd and the axes of the first to fourth electrodes 5aa, 5ab, 5ac, and 5ad are in an orthogonal positional relationship. Since the two are in an orthogonal positional relationship, there is an action that the function of making the air flow 2d turbulent becomes stronger. The distance between the fifth to eighth electrodes 5ba, 5bb, 5bc, and 5bd is, for example, 6 cm.
The 9th to 12th electrodes 5ca, 5cc, 5cc, and 5cd are located on the wake side from the position where the 5th to 8th electrodes 5ba, 5bb, 5bc, and 5bd are installed, for example, approximately 21.5 cm away. It is installed parallel to. The axes of the ninth to twelfth electrodes 5ca, 5cc, 5cc, and 5cd are arranged parallel to the axes of the first to fourth electrodes 5aa, 5ab, 5ac, and 5ad. That is, the axes of the 5th to 8th electrodes 5ba, 5bb, 5bc, and 5bd and the axes of the 9th to 12th electrodes 5ca, 5cc, 5cc, and 5cd are orthogonal to each other. Since the two are in an orthogonal positional relationship, there is an action that the function of making the air flow 2d turbulent becomes stronger. The distance between the ninth to twelfth electrodes 5ca, 5cc, 5cc, and 5cd is, for example, 6 cm.

The ozone decomposition catalyst 17 is installed on the wake side, for example, at a position approximately 10 cm away from the positions of the ninth to twelfth electrodes 5ca, 5cc, 5cc, and 5cd.
The blower 4 is installed on the wake side from the position of the ozone decomposition catalyst 17, for example, at a position approximately 10 cm away.
The average flow velocity inside the housing 1 is approximately 43 cm / sec. It should be noted that the value calculated from the relational expression of the air volume (Q: m ³ / min), the cross-sectional area of the housing 1 (S: m ² ), and the average flow velocity (v: m / sec), Q = S · v. is there. However, the cross-sectional area S 30cmx0cm = 900cm ^2, air volume Q was set to 23.3 m ^3/10 min.
In this case, Reynolds number Re = (air density) x (typical size of object) x (flow velocity) / viscosity coefficient = (1.206 kg / m ³ ) x (0.03 m) x (0.43 m / s) ^{) / (1.83x10 -5 Pa · s} ) = 850, it is.
Air 2d containing enveloped viruses such as the new coronavirus and influenza virus flows in a Kalman vortex-like airflow or in a turbulent state at an average flow velocity of 43 cm / s.
The air 2d containing the virus enters the Karman vortex or turbulent state Ran1, Ran2 and Ran3 and passes near the second plasma generating means 21, so that it is efficiently contact-mixed with the dielectric barrier discharge narrow gap plasma 5a. Will be done. Region sandwiched between the first to fourth electrodes 5aa, 5ab, 5ac, 5ad in the first row of the matrix arrangement and the ninth to twelfth electrodes 5ca, 5cc, 5cc, 5cd in the third row of the matrix arrangement. The time to pass through is about 1 second. During that time, in the region of the dielectric barrier discharge narrow gap plasma 5a generated by the second plasma generating means 21, the plaza 5a and the air 2d are effectively contacted and mixed, so that the viruses are surely released. Dead or inactivated. Further, since the viruses diffuse while being agitated with the radicals generated by the second plasma generating means 21, the plasma bactericidal effect works effectively.
In the air purifier using plasma according to the second embodiment of the present invention, the matrix (matrix) arrangement is 3 rows and 3 columns, but for example, 5 rows and 5 columns and 10 rows and 10 columns are arranged. You can choose the arrangement etc.
Further, in the matrix-like arrangement, a staggered arrangement, that is, a staggered arrangement may be selected for each row.

As shown in the above description, in the air purifying device using plasma according to the second embodiment of the present invention, the second plasma generating means 21 has an electrically ungrounded non-grounded electrode and a columnar column. A plurality of pairs of electrodes, which are a pair of a ground electrode formed of the metal of the above and electrically grounded, and a dielectric film covering at least one of the non-ground electrode and the ground electrode, are spatially separated from each other. It is equipped with an AC power supply that applies a voltage between the non-ground electrode and the ground electrode that are paired with each other, and the plurality of pairs of electrodes are arranged in a matrix, which is typical of the cross section of the ground electrode. The size is such that the Reynolds number Re is approximately 40 or more, that is, the relational expression of the Reynolds number Re = (air density) x (flow velocity) x (typical size of the cross-sectional shape) / (viscosity coefficient). The representative size of the ground electrode is selected so that the number of Reynolds derived in (1) is approximately 40 or more.
As a result, the sterilization target or purification target contained in the air is agitated and diffused as a Karman vortex or turbulent flow, and is reliably and evenly contact-mixed with the plasma, and plasma sterilization can be effectively performed. is there. Moreover, since the plurality of pairs of electrodes are spatially separated from each other, there is little pressure loss and a large amount of air can be treated. Further, since the plurality of pairs of electrodes are of the narrow gap plasma generation method in which the dielectric film is sandwiched, plasma can be generated with low voltage and low power consumption. As a result, it has the effect of solving the conventional problems.
The air purifier using plasma according to the second embodiment of the present invention sterilizes and purifies the air in a partitioned space (sealed space) such as a general household, office, hospital, elderly care facility, restaurant, etc. It is possible to put it into practical use as an air purifier using plasma. Its social contribution and industrial value are remarkably great.

(Third Embodiment)
Next, the air purifier using plasma according to the third embodiment of the present invention will be described with reference to FIGS. 6 to 8. See also FIGS. 1-5.
First, the configuration of the atmospheric pressure plasma sterilization processing apparatus according to the third embodiment of the present invention will be described.
FIG. 6 is a schematic perspective view showing an air purifier using plasma according to a third embodiment of the present invention. FIG. 7 is a schematic perspective view (a) and a cross-sectional view (b) showing electrodes which are constituent members of an air purifier using plasma according to a third embodiment of the present invention. FIG. 8 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to a third embodiment of the present invention.

In the air purifier using plasma according to the third embodiment of the present invention, the third plasma generating means 22, the ozone decomposition catalyst 17, the cooling fin 18 and the blower 4 described later are contained in the housing 1. Be prepared.
The plasma-based air purifier according to the third embodiment of the present invention has the 13th to 21st electrodes 5da, 5db, 5dc, 5ea, arranged in a matrix (matrix), as described below. It includes 5 eb, 5 ec, 5 fa, 5 fb, and 5 fc.
Here, the 13th, 14th, and 15th electrodes 5da, 5db, and 5dc are located in the first row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. It is called an electrode to be used. Further, the 16th, 17th and 18th electrodes 5ea, 5eb and 5ec are located in the second row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. Called an electrode. Further, the 19th, 20th and 21st electrodes 5fa, 5fb and 5fc are located in the third row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. Called an electrode.

Reference numeral 5da is the thirteenth electrode. As shown in FIGS. 6 and 8, the thirteenth electrode 5da is used in combination with the fourteenth and fifteenth electrodes 5db and 5dc described later. The thirteenth, fourteenth and fifteenth electrodes 5da, 5db and 5dc are arranged at equal intervals in a plane parallel to the opening of the suction port 2a as shown in FIGS. 6 and 8.
When air 2d is sucked into the housing 1 from the suction port 2a, it hits the thirteenth electrode 5da and a Karman vortex is generated. When the Reynolds number is about 40 to about 300, Karman vortices are generated around an object having a circular or rectangular cross section placed in an air flow. When the Reynolds number is about 300 or more. It becomes a turbulent flow. That is, the air 2d flowing in from the suction port 2a becomes a flow in which a Karman vortex is generated or a flow in a turbulent state by the thirteenth electrode 5da. The state is shown by turbulent Ran1 in FIG. In the state of Ran1, the air 2d flows toward the 16th electrode 5ea, which will be described later, located on the wake side while being agitated temporally and spatially.
The thirteenth electrode 5da is formed by combining a plurality of rectangular electrodes. Here, as shown in FIGS. 7 (a) and 7 (b), for example, two ground electrodes and two non-ground electrodes, two rectangular columnar non-ground electrodes coated with a dielectric, and the dielectric. The two ground electrodes having a rectangular columnar shape covered with a body and a plurality of pairs of electrodes paired with each other are formed as an aggregate in a form in which one side of each electrode is in close contact with each other.
As shown in FIGS. 7A and 7B, the thirteenth electrode 5da is electrically formed of the electrically ungrounded non-grounded electrodes 7ma and 7mb and a metal having a rectangular cross section and a columnar shape. It is composed of grounded ground electrodes 6ma and 6mb, and a dielectric film 8m formed so as to cover the non-grounding electrodes 7ma and 7mb and the grounding electrodes 6ma and 6mb.
A voltage for plasma generation is applied from the AC power source 9 between the ground electrodes 6ma and 6mb and the non-ground electrodes 7ma and 7mb. When a high voltage between the ground electrodes 6ma and 6mb and the non-ground electrodes 7ma and 7mb is applied from the flow power source 9, a dielectric barrier discharge narrow gap plasma 5b is generated as shown in FIG. 7B. To. The dielectric barrier discharge narrow gap plasma 5b is generated in the adjacent gaps and corners of the ground electrodes 6ma and 6mb and the non-ground electrodes 7ma and 7mb, respectively. The dielectric barrier discharge narrow gap plasma 5b looks like a band in appearance.

Here, the non-grounded electrodes 7ma and 7mb and the grounding electrodes 6ma and 6mb have a rectangular cross-sectional shape, but the cross-sectional shape is not limited to this. Instead of a rectangle, a triangle, a trapezoid, or the like may be used.

Reference numeral 5db is the 14th electrode. As shown in FIGS. 6 and 8, the 14th electrode 5db is used in combination with the 14th electrode 5db and the 15th electrode 5dc described later.
When air 2d flows from the suction port 2a to the housing 1, it hits the 14th electrode 5db and a Karman vortex is generated. When the Reynolds number is about 40 to about 300, Karman vortices are generated around an object having a circular or rectangular cross section placed in an air flow. When the Reynolds number is about 300 or more. It becomes a turbulent flow. That is, the air 2d flowing from the suction port 2a becomes a flow in which a Karman vortex is generated or a flow in a turbulent state by the 14th electrode 5db. The state is shown by turbulent Ran1 in FIG. In the state of Ran1, the air 2d flows toward the 17th and 18th electrodes 5ea and 5ec, which will be described later, located on the wake side while being agitated temporally and spatially.
The 14th electrode 5db is formed by combining a plurality of rectangular electrodes. Here, as shown in FIGS. 7 (a) and 7 (b), for example, two ground electrodes and two non-ground electrodes, two rectangular columnar non-ground electrodes coated with a dielectric, and the dielectric. The two ground electrodes having a rectangular columnar shape covered with a body and a plurality of pairs of electrodes paired with each other are formed as an aggregate in a form in which one side of each electrode is in close contact with each other.
Similar to the thirteenth electrode 5da, the fourteenth electrode 5db includes the electrically ungrounded non-grounded electrodes 7na and 7nb, and the grounding electrode 6na which is formed of a columnar metal having a rectangular cross section and is electrically grounded. , 6nb, and a dielectric film 8n formed so as to cover the non-grounded electrode 7na and the grounding electrode 6na. Then, a voltage for plasma generation is applied from the AC power source 9 between the ground electrodes 6na and 6nb and the non-ground electrodes 7na and 7nb. When a high voltage between the ground electrodes 6na and 6nb and the non-ground electrodes 7na and 7nb is applied from the flow power source 9, a dielectric barrier discharge narrow gap plasma 5b is generated. The dielectric barrier discharge narrow gap plasma 5b is generated in the adjacent gaps and corners of the ground electrodes 6na and 6nb and the non-ground electrodes 7na and 7nb. The dielectric barrier discharge narrow gap plasma 5b looks like a band in appearance.

Reference numeral 5dc is a fifteenth electrode. The fifteenth electrode 5dc is used in combination with the thirteenth electrode 5da and the fourteenth electrode 5db as shown in FIGS. 6 and 8. When air 2d flows from the suction port 2a to the housing 1, it hits the fifteenth electrode 5dc and a Karman vortex is generated. When the Reynolds number is about 40 to about 300, Karman vortices are generated around an object having a circular or rectangular cross section placed in an air flow. When the Reynolds number is about 300 or more. It becomes a turbulent flow. That is, the air 2d flowing from the suction port 2a becomes a flow in which a Karman vortex is generated or a flow in a turbulent state by the fifteenth electrode 5dc. The state is shown by turbulent Ran1 in FIG. In the state of Ran1, the air 2d flows toward the 17th and 18th electrodes 5eb and 5ec, which will be described later, located on the wake side while being agitated temporally and spatially.
Similar to the thirteenth electrode da, the fifteenth electrode 5dc includes the electrically ungrounded non-grounded electrodes 7pa and 7pb, and the grounded electrode 6pa which is formed of a columnar metal having a rectangular cross section and is electrically grounded. , 6pb, and a dielectric film 8p formed so as to cover the non-grounded electrode 7pa and the grounding electrode 6pa. Then, a voltage for plasma generation is applied from the AC power source 9 between the ground electrodes 6pa and 6pb and the non-ground electrodes 7pa and 7pb. When a high voltage between the ground electrodes 6pa and 6pb and the non-ground electrodes 7pa and 7pb is applied from the flow power source 9, a dielectric barrier discharge narrow gap plasma 5b is generated. The dielectric barrier discharge narrow gap plasma 5b is generated in the adjacent gaps and corners of the ground electrodes 6pa and 6pb and the non-ground electrodes 7pa and 7pb, respectively. The dielectric barrier discharge narrow gap plasma 5b looks like a band in appearance.
Here, the non-grounded electrodes 7ma and 7mb and the grounding electrodes 6ma and 6mb have a rectangular cross-sectional shape, but the cross-sectional shape is not limited to this. Instead of a rectangle, a triangle, a trapezoid, or the like may be used.
Here, the 13th, 14th, and 15th electrodes 5da, 5db, and 5dc arranged side by side in parallel with the opening of the suction port 2a are air-cleaned using plasma according to the third embodiment of the present invention. It is called an electrode located in the first row in the matrix arrangement of the device.

Reference numeral 5ea is the 16th electrode. As shown in FIGS. 6 and 8, the 16th electrode 5ea is used in combination with the 17th electrode 5eb and the 18th electrode 5ec, which will be described later. As shown in FIG. 8, the 16th, 17th, and 18th electrodes 5ea, 5eb, and 5ec are distanced to the wake side of the electrodes 5da, 5db, and 5dc located in the first row in the matrix arrangement. Are placed at equal intervals in a plane parallel to the opening of the suction port 2a. When air 2d flows from the upstream side, it hits the 16th electrode 5ea and a Karman vortex is generated or becomes a turbulent flow. That is, the air 2d flowing from the upstream side becomes a turbulent flow Ran2 as shown in FIG. 8 by the 16th electrode 5ea, and while being agitated, the 19th and 20th electrodes 5fa described later located on the wake side. It flows toward 5fb.
Similar to the thirteenth electrode da, the sixteenth electrode 5ea includes the electrically ungrounded non-grounded electrodes 7qa and 7qb and the grounded electrode 6qa which is formed of a columnar metal having a rectangular cross section and is electrically grounded. , 6qb, and a dielectric film 8q formed so as to cover the non-grounded electrode 7qa and the grounding electrode 6qa. Then, a voltage for plasma generation is applied from the AC power supply 9 between the ground electrodes 6qa and 6qb and the non-ground electrodes 7qa and 7qb. When a high voltage between the ground electrodes 6qa and 6qb and the non-ground electrodes 7qa and 7qb is applied from the flow power source 9, a dielectric barrier discharge narrow gap plasma 5b is generated. The dielectric barrier discharge narrow gap plasma 5b is generated in the adjacent gaps and corners of the ground electrodes 6pa and 6pb and the non-ground electrodes 7pa and 7pb, respectively. The dielectric barrier discharge narrow gap plasma 5b looks like a band in appearance.
Reference numeral 5eb is the 17th electrode. As shown in FIGS. 6 and 8, the 17th electrode 5eb is used in combination with the 16th electrode 5ea and the 18th electrode 5ec described later. When air 2d flows from the upstream side, it hits the 17th electrode 5eb and a Karman vortex is generated or becomes a turbulent flow. That is, the air 2d flowing from the upstream side becomes the turbulent flow Ran2 shown in FIG. 8 by the 17th electrode 5eb, and while being agitated, the 20th and 21st electrodes 5fb and 5fc described later located on the wake side. It flows toward.
The configuration of the 17th electrode 5eb is the same as that of the 16th electrode.
Reference numeral 5 ec is the 18th electrode. The 18th electrode 5ec is used in combination with the 16th and 17th electrodes 5ea and 5eb, as shown in FIGS. 6 and 8. When air 2d flows from the upstream side, it hits the 18th electrode 5ec and a Karman vortex is generated or becomes a turbulent flow. That is, the air 2d flowing from the upstream side becomes the turbulent flow Ran2 shown in FIG. 8 by the 18th electrode 5ec, and while being agitated, the 20th and 21st electrodes 5fb, which will be described later, are located on the wake side. It flows toward 5fc.
The configuration of the 18th electrode 5ec is the same as that of the 16th electrode.
Here, the second row in the matrix-like arrangement of the 16th, 17th, and 18th electrodes 5ea, 5eb, and 5ec in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. It is called an electrode located in.

Reference numerals 5fa, 5fb, and 5fc are the 19th, 20th, and 21st electrodes. The 19th, 20th and 21st electrodes fa, fb and fc are located in the second row in the matrix arrangement, as shown in FIG. 8, the 16th, 17th and 18th electrodes 5ea, They are arranged at equal intervals in a plane parallel to the opening of the suction port 2a at a distance on the wake side of 5eb and 5ec. When air 2d flows from the upstream side, it hits the 19th, 20th and 21st electrodes 5fa, 5fb and 5fc, and a Karman vortex is generated or becomes a turbulent flow. That is, the air 2d flowing from the upstream side becomes the turbulent flow Ran3 shown in FIG. 8 by the 19th electrode 5fa, and flows to the wake side while being agitated.
The configurations of the 19th, 20th and 21st electrodes fa, fb and fc are the same as those of the 16th, 17th and 19th electrodes 5ea, 5eb and 5ec.
Here, the 19th, 20th, and 21st electrodes 5fa, 5bb, and 5fc arranged side by side in parallel with the opening of the suction port 2a used the plasma according to the third embodiment of the present invention. It is called an electrode located in the third row in the matrix arrangement of the air purifier.
A set of the 13th to 21st electrodes 5da, 5db, 5dc, 5ea, 5eb, 5ec, 5fa, 5fb, and 5fc arranged in a matrix is collectively referred to as a third plasma generating means 22.

Reference numeral 18 is a cooling fin. The cooling fin 18 cools while passing air. The cooling fin 18 is supplied with a refrigerant from the refrigerant inlet pipe 18a described later, and is discharged from the refrigerant outlet pipe 18b described later. The cooling fin 18 can adjust the air to an arbitrary temperature in the range of about 10 ° C. to about 40 ° C. like a general air conditioner.
Reference numeral 18a is a refrigerant inlet pipe. The refrigerant inlet pipe 18a supplies the cooling fin 18 with a refrigerant adjusted to an arbitrary temperature of about 10 ° C. to about 40 ° C.
Reference numeral 18b is a refrigerant outlet pipe. The refrigerant outlet pipe 18b discharges the refrigerant from the cooling fin 18 to the outside. The cooling fin 18, the refrigerant inlet pipe 18a, and the refrigerant outlet pipe 18b are used in cooperation with each other.

A humidity controller (not shown) may be installed. The grounding location of the humidity controller (not shown) may be near the suction port 2a or on the wake side of the cooling fin 18. It can be installed in any position.

Next, a method for sterilizing or inactivating enveloped viruses such as the new type coronavirus and influenza virus floating in the air will be described using the air purifying device using plasma according to the third embodiment of the present invention. ..
Here, for example, the target space is 6 tatami mats of a Japanese house. The space volume between 6 tatami mats is 3.6mx 2.7mx height 2.4m = 23.3m ³ .
The air contained in the 6 tatami mats is taken into an air purifier using the virus according to the third embodiment of the present invention with an air volume capable of sterilizing in 10 minutes, and the plasma-treated air is blown out. Explain that the enveloped virus such as a new type corona virus or influenza virus contained in the air is sterilized or inactivated.
The blowing capacity of the blower, which is a component of the air purifying device using plasma according to the third embodiment of the present invention, is, for example, 2.33 m ³ / min. The size of the housing 1 is, for example, 30 cm x 30 cm x 105 cm in terms of internal dimensions.
The area of the entrance 2a of the housing 1 is, for example, approximately 900 cm ² (for example, an opening of 30 cm in length × 30 cm in width).
The sizes of the 13th to 21st electrodes 5da, 5db, 5dc, 5ea, 5eb, 5ec, 5fa, 5fb, and 5fc are, for example, 3 cm square x 30 cm in external dimensions, respectively.
The 13th, 14th, and 15th electrodes 5da, 5db, and 5dc, which are the electrodes located in the first row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. It is arranged parallel to the opening of the suction port 2a, for example, at a position 1 cm from the opening. The distance between the electrodes is, for example, 6 cm. The distance between the wall of the housing 1 and the electrodes is, for example, 4.5 cm.
The 16th, 17th, and 18th electrodes 5ea, 5eb, and 5ec, which are the electrodes located in the second row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. , The electrodes are arranged at a distance of, for example, about 22 cm from the electrodes located in the first row in the matrix arrangement. The distance between the 16th, 17th, and 18th electrodes 5ea, 5eb, and 5ec is, for example, 6 cm. The distance between the wall of the housing 1 and the electrodes is, for example, 4.5 cm.
The 19th, 20th, and 21st electrodes 5fa, 5fb, and 5fc, which are the electrodes located in the third row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. , Arranged at a distance of, for example, approximately 22 cm from the electrodes located in the second row in the matrix arrangement. The distance between the 19th, 20th and 21st electrodes 5fa, 5fb and 5fc is set to, for example, 6 cm. The distance between the wall of the housing 1 and the electrodes is, for example, 4.5 cm.
The 19th, 20th, and 21st electrodes 5fa, 5fb, and 5fc, which are the electrodes located in the third row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. The distance of the ozone decomposition catalyst 17 is, for example, 20 cm.

The distance between the ozone decomposition catalyst 17 and the cooling fin 18 is, for example, 10 cm. The distance between the cooling fin 18 and the blower 4 is, for example, 10 cm.
The average flow velocity inside the housing 1 is approximately 43 cm / sec. It should be noted that the value calculated from the relational expression of the air volume (Q: m ³ / min), the cross-sectional area of the housing 1 (S: m ² ), and the average flow velocity (v: m / sec), Q = S · v. is there. However, the cross-sectional area S 30cmx0cm = 900cm ^2, air volume Q was set to 23.3 m ^3/10 min.
Since the wind speed is 0.43 m / s and the typical size D of the electrodes, which are the constituent members of the third plasma generating means 22, is 3 cm, the Reynolds number has the following values.
Reynolds number Re = (air density) x (typical size of object) x (flow velocity) / viscosity coefficient = (1.206 kg / m ³ ) x (0.03 m) x (0.43 m / s) / ( ^{1.83x10 -5 Pa · s) = 850} . Since the Reynolds number Re is 850, the air 2d passing through the third plasma generating means 22 is in a turbulent state. That is, the air 2d flows while changing temporally and spatially like Ran1, Ran2, and Ran3 shown in FIG.
As a result, the electrodes 5ea, 5eb of the 16th, 17th, and 18th electrodes located in the second row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. When passing in the vicinity of 5 ec, the turbulent air 2d is efficiently contact-mixed with the plasma 5b. Further, the 19th, 20th and 21st electrodes 5fa, 5fb, which are electrodes located in the third row in the matrix-like arrangement of the air purifier using plasma according to the third embodiment of the present invention. When passing in the vicinity of 5fc, the turbulent air 2d is efficiently contact-mixed with the plasma 5b.

First, the air purifier using plasma according to the third embodiment of the present invention is installed at an arbitrary place between 6 tatami mats, which is the target space.
Next, the blower 4 is operated, and the air between the 6 tatami mats is sucked into the housing 1 and blown out. Then, the voltage of the AC power supply 9 is set to a predetermined value and operated. As for the operating conditions such as the voltage and current of the AC power supply 9, when the plasma generating means 22 is attached to the housing 1, the relationship between the voltage, current and the amount of ozone generated is grasped as data in advance, and the data is used. Evaluate and analyze to select the optimum conditions. When acquiring the above data, it is desirable to carry out an experiment with an ozone concentration regulation value of 0.01 ppm or less.
From the AC power supply 9 to the third plasma generating means 22 via the first and second feeder lines 10a and 10b, the first and second terminals 11a and 11b, and the first and second introduction lines 12a and 12b. When a voltage is applied, a dielectric barrier discharge narrow gap plasma 5b is generated, as shown in FIGS. 7A and 7B.
When the dielectric barrier discharge narrow gap plasma 5b is generated, enveloped viruses such as the new corona virus and influenza virus become positive ions, negative ions, ultraviolet rays, active oxygen (O radicals, OH radicals, etc.), and active nitrogen (N). Radicals, NO radicals, etc.), plasma chemical reactions such as ozone, and plasma physical reactions will almost certainly kill or inactivate.
In the air purifier using plasma according to the third embodiment of the present invention, the air 2d to be treated with plasma flows into the region of the dielectric barrier discharge narrow gap plasma 5b in a turbulent state while being stirred. Efficiently contact-mixes with plasma 5b. As a result, a plasma sterilization effect can be expected.
In the air purifier using plasma according to the third embodiment of the present invention, the matrix (matrix) arrangement is 3 rows and 3 columns, but for example, 5 rows and 5 columns and 10 rows and 10 columns are arranged. You can choose the arrangement etc.
Further, in the matrix-like arrangement, a staggered arrangement, that is, a staggered arrangement may be selected for each row.
The operation of the air purifier using plasma according to the third embodiment of the present invention is arbitrarily possible, such as constant operation or operation at a predetermined time zone.

As shown in the above description, in the air purifying device using plasma according to the third embodiment of the present invention, air 2d containing an enveloped virus such as a new type corona virus or influenza virus generates a third plasma. Since a turbulent flow state occurs around the means 22, it is efficiently contact-mixed with the dielectric barrier discharge narrow gap plasma 5b. As a result, plasma sterilization or inactivation can be performed reliably, without leakage, and evenly. Moreover, since the electrodes are spatially spaced apart, there is little pressure loss and a large amount of air can be treated. Further, since the plurality of pairs of electrodes are of the narrow gap plasma generation method in which the dielectric film is sandwiched, plasma can be generated with low voltage and low power consumption. As a result, it has the effect of solving the conventional problems.
The air purifier using plasma according to the third embodiment of the present invention sterilizes and purifies the air in a partitioned space (sealed space) such as a general household, office, hospital, elderly care facility, restaurant, etc. It is possible to put it into practical use as an air purifier using plasma. Its social contribution and industrial value are remarkably great.

(Fourth Embodiment)
Next, the air purifier using plasma according to the fourth embodiment of the present invention will be described with reference to FIGS. 9 and 10. See also FIGS. 1-8.
First, the configuration of the air purifier using plasma according to the fourth embodiment of the present invention will be described.
FIG. 9 is a schematic cross-sectional view showing the configuration of an air purifier using plasma according to a fourth embodiment of the present invention. FIG. 10 is a schematic perspective view (a) and a cross-sectional view (b) showing a rectifying plate which is a constituent member of an air purifier using plasma according to a fourth embodiment of the present invention.

The plasma-based air purifier according to the fourth embodiment of the present invention is arranged in the housing 1 in a matrix (matrix) of the first to third straightening vanes 5xa, 5xb, 5xc described later. The 13th to 21st electrodes 5da, 5db, 5dc, 5ea, 5eb, 5ec, 5fa, 5fb, 5fc, ozone decomposition catalyst 17, cooling fin 18, and blower 4 are provided.
The first to third straightening vanes 5xa, 5xb, and 5xc can generate the dielectric barrier discharge narrow gap plasma 5c described later, and can adjust the air flow.

Reference numerals 5xa, 5xb and 5xc are first, second and third straightening vanes. The first, second, and third straightening vanes 5xa, 5xb, and 5xc are arranged in the vicinity of the suction port 2a, and regulate the flow of air sucked from the suction port 2a to the housing 1. Then, the first, second and third straightening vanes 5xa, 5xb and 5xc can generate a dielectric barrier discharge narrow gap plasma 5c as shown in FIGS. 9A and 9B.
Here, for example, the case where the first, second and third straightening vanes 5xa, 5xb and 5xc are combined with, for example, the air purifier using plasma according to the third embodiment of the present invention is described below. explain.
The configurations of the first, second and third straightening vanes 5xa, 5xb and 5xc are as follows. As shown in FIGS. 9A and 9B, strip-shaped non-grounded electrodes 7x and 7y having a rectangular cross-sectional shape and grounding electrodes 6x, 6y and 6z are arranged side by side in a plane and illustrated closely. Not fixed by fixing means. Dielectric thin films 8x, 8y, 8z are formed on the surfaces of the non-grounded electrodes 7x, 7y and the grounding electrodes 6x, 6y, 6z, respectively. The thickness should be thin. For example, it is set to 80 μm. The material may be a dielectric material. The dielectric thin films 8x, 8y, and 8z have mica (mica), ferrite, neodymium, silicon oxide (SiO ₂ ), aluminum oxide (Al ₂ O ₃ ), and manganese oxide having a particle size in the range of about 10 nm to about 65 μm. A dielectric film containing at least two or more of the dielectrics of (MnO ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), magnesium oxide (MgO) and titanium oxide (TiO ₂ ) is preferable.
Between the non-grounded electrodes 7x and 7y and the grounded electrodes 6x, 6y and 6z, a high voltage is applied from the AC power supply 9 as in the case of the air purifier using plasma according to the third embodiment of the present invention. It is applied.
When a high voltage is applied between the non-grounded electrodes 7x, 7y and the grounded electrodes 6x, 6y, 6z, a dielectric barrier discharge narrow is applied to the gap between the adjacent non-grounded electrode 7x and the grounded electrode 6x and the corner of the electrode. Gap plasma 5c is generated.
Similarly, a dielectric barrier discharge narrow gap plasma 5c is generated in the gap between the adjacent non-grounded electrodes 7x and the grounding electrode 6y and at the corners of the electrodes. Similarly, a dielectric barrier discharge narrow gap plasma 5c is generated in the gap between the adjacent non-grounded electrodes 7y and the grounding electrode 6y and at the corners of the electrodes. Similarly, a dielectric barrier discharge narrow gap plasma 5c is generated in the gap between the adjacent non-grounded electrodes 7y and the grounding electrode 6z and at the corners of the electrodes.

The cross-sectional shapes of the first, second and third straightening vanes 5xa, 5xb and 5xc are not limited to rectangles. Trapezoidal, triangular, semi-circular and the like can be used.

Next, there is a method of sterilizing or inactivating enveloped viruses such as new corona virus and influenza virus floating in the air by using an air purifier using plasma according to a fourth embodiment of the present invention. , 1st to 3rd sterilizing plates 5xa, 5xb, 5xc are installed near the suction port 2a, but are the same as in the case of the air purifying device using plasma according to the third embodiment of the present invention.

As shown in the above description, the air purifier using plasma according to the fourth embodiment of the present invention can adjust the air flow and can generate a dielectric barrier discharge narrow gap plasma 5c. Since the first to third rectifying plates 5xa, 5xb, and 5xc are provided, air 2d containing enveloped viruses such as new corona virus and influenza virus can be effectively, reliably, leaked, and evenly executed. is there. Moreover, since the electrodes are spatially spaced apart, there is little pressure loss and a large amount of air can be treated. Further, since the plurality of pairs of electrodes are of the narrow gap plasma generation method in which the dielectric film is sandwiched, plasma can be generated with low voltage and low power consumption. As a result, it has the effect of solving the conventional problems.
The air purifier using plasma according to the fourth embodiment of the present invention sterilizes and purifies the air in a partitioned space (sealed space) such as a general household, office, hospital, elderly care facility, restaurant, etc. It is possible to put it into practical use as an air purifier using plasma. Its social contribution and industrial value are remarkably great.

1 ... housing,
2a ... Inhalation port,
2b ... outlet,
2c ... air flow path,
4 ... Blower,
Ran1, Ran2, runn3 ... Turbulence,
5a, 5b, 5c ... Dielectric barrier discharge narrow gap plasma,
6a ... Ground electrode,
7a ... Non-grounded electrode,
8a ... Dielectric film,
9 ... AC power supply,
5aa, 5ab, 5ac, 5ad, 5ba, 5bb, 5bc, 5bd, 5ca, 5cab, 5cc and 5cd ... Ninth, tenth, eleventh and twelfth electrodes,
5da, 5db, 5dc, 5ea, 5eb, 5ec, 5fa, 5fb and 5fc ... 13th, 14th, 15th, 16th, 17th, 18th, 19th, 20th and 21st electrodes,
5xa, 5xb, 5xc ... First, second, third straightening vanes.

Claims (15)

A housing that forms an air flow path connecting an intake port that sucks in air in a target space to be sterilized or cleaned and an outlet that blows air out to the target space, and an air flow are generated. An air purifier using plasma provided with a blower and a plasma generating means for converting the air into plasma and processing the air.
The plasma generating means includes an electrically ungrounded non-grounded electrode, a grounded electrode formed of columnar metal and electrically grounded, and a dielectric covering at least one of the non-grounded electrode and the grounded electrode. A film and a plurality of pairs of electrodes paired with each other are provided spatially separated from each other, and an AC power source for applying a voltage between the non-grounded electrode and the ground electrode paired with each other is provided.
The electrode has a Reynolds number Re of about 40 or more, that is, "Reynolds number Re = (air density) x (flow velocity) x (typical size of the cross-sectional shape of the electrode) / (viscosity coefficient)" is approximately An air purifier using plasma, which is characterized by having a hydrodynamic condition of being 40 or more. The air purifier using plasma according to claim 1, wherein the plurality of pairs of electrodes are arranged in a matrix. The distance between the grounded electrode and the non-grounded electrode is such that the product of the pressure p and the electrode distance d according to Paschen's law is 0.2 to 10 mmHg · cm, that is, p {mmHg} d {cm} = 0.2 to The air purifying device using plasma according to claim 1 or 2, wherein the value is in the range of 3 μm to 130 μm, which is a value substantially equal to the condition satisfying 10 mmHg · cm. The air purifier using plasma according to any one of claims 1 to 3, wherein the ground electrode has a circular or polygonal cross-sectional shape. The air purifying device using plasma according to any one of claims 1 to 4, wherein some of the ground electrodes are arranged so that the axes of the ground electrodes are orthogonal to each other. The air purifying device using plasma according to any one of claims 1 to 4, wherein the ground electrode has a staggered arrangement of matrices in the matrix arrangement. The plasma according to any one of claims 1 to 6, wherein the non-grounded electrode is spirally wound around the grounded electrode in close contact with the grounding electrode via the dielectric film. Air purifier. The air purifier using plasma according to claim 7, wherein the non-grounded electrode is coated with a dielectric film having excellent flexibility and acid resistance. The plasma generating means has a plurality of pairs of electrodes, each of which is a pair of a columnar non-grounded electrode having a rectangular cross section coated with the dielectric and a columnar ground electrode having a rectangular cross section coated with the dielectric. Any one of claims 1 to 6, wherein at least one side of the electrode is formed as one aggregate in a form in which at least one side is in close contact with each other, and a plurality of the aggregates are provided spatially separated from each other. The air purifier using the plasma described in the section. The dielectric film formed on the surface of the ground electrode has a particle size in the range of about 10 nm to about 65 μm, such as mica (mica), ferrite, neodymium, silicon oxide (SiO ₂ ), and aluminum oxide (Al ₂ O ₃ ). , Manganese oxide (MnO ₂ ), zinc oxide (ZnO), tin oxide (SnO ₂ ), magnesium oxide (MgO) and titanium oxide (TiO ₂ ), which are characterized by containing at least two or more dielectrics. The air purifying device using the plasma according to any one of claims 1 to 9. The air using the plasma according to any one of claims 1 to 10, wherein the AC power supply applies a voltage having a frequency in the audible region between the non-grounded electrode and the grounded electrode. Cleaning device. A plurality of non-ground electrodes having a rectangular, trapezoidal, or triangular cross section covered with the dielectric and a plurality of ground electrodes having a rectangular, trapezoidal, or triangular cross section coated with the dielectric are placed on one plane. The first to eleventh aspects of the present invention, wherein one plate-shaped aggregate is formed by arranging them in close contact with each other, and a plurality of the plate-shaped aggregates are arranged as a rectifying plate near the suction port. The air purifying device using the plasma according to any one of the items. The housing includes the blower, the plasma generating means, and a catalyst for decomposing ozone, and the plasma generating means and the catalyst for decomposing ozone are arranged in this order from the upstream side of the air flow. The air purifying device using plasma according to any one of claims 1 to 12, wherein the air purifying device uses plasma. The air purifying device using plasma according to any one of claims 1 to 13, wherein the housing includes cooling fins for cooling the air in the flow path. The air purifying device using plasma according to any one of claims 1 to 14, wherein the housing includes a humidity adjusting means for adjusting the humidity of the air in the flow path.

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