JP2006167190A - Air purifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a space-saving air purifier capable of effectively removing both of two kinds of contamination factors existing in a space and reducing power consumption. <P>SOLUTION: An element is provided with three electrodes (a first electrode 2, a second electrode 4 and a third electrode 6). Surface discharge between the first electrode 2 and the second electrode 4 shows an effective action to mold, floating fungi, viruses and allergen components, etc., existing in the space. Corona discharge (barrier discharge)between the second electrode 4 and the third electrode 6 shows an effective action to VOCs (volatile organic compounds) existing in the space. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention effectively removes both biological stains such as molds, airborne bacteria, viruses, pollen, and mite allergen components present in the air, and inanimate stains of VOC (volatile organic compounds). The present invention relates to an air purification device that can be removed and inactivated.

  In recent years, since the degree of sealing in the residential environment has increased, there is a strong demand for a healthy and comfortable life by removing odors and dirt by purifying the air in the space.

There are a number of factors overlapping air pollution, but the causes can be broadly classified into two types.
A) Caused by mold, planktonic bacteria, viruses or allergen components.
B) Artificial chemical substance VOC (volatile organic compound).
are categorized.

  When these various components are mixed in a space such as a house, they become various odors or have a harmful effect on the human body. Therefore, in order for human beings to live a healthy and comfortable life, it is desired to effectively remove these causes, and the needs as products are very high.

  First, for a) molds, planktonic bacteria, viruses, etc., a method using the effect of ions in the atmosphere is used as a very preferable method. As disclosed in Patent Document 1 and the like, an air conditioning apparatus using an ion generator can provide a bactericidal action or a deodorizing action.

As an operating principle of the ion generation apparatus using the effect of ions in the atmosphere, the discharge phenomenon is used, and an ion generation element having an ion generation electrode that generates ions is used between the electrodes (first electrode and second electrode). When an alternating high voltage (in many cases, a pulse voltage) is applied, positive ions and negative ions are generated from the ion generation electrode (second electrode) by a creeping discharge phenomenon. As ion species, positive ions are H ⁺ (H ₂ O) _m (m is an arbitrary natural number), and negative ions are O ₂ ⁻ (H ₂ O) _n (n is an integer of 0 or more). Yes.

When these positive ions and negative ions are generated in the air at the same time, a chemical reaction occurs to generate hydrogen peroxide H ₂ O ₂ or hydroxy radicals · OH as active species. These hydrogen oxides H ₂ O ₂ or hydroxy radicals · OH exhibit extremely strong activity, and this can remove mold, airborne bacteria and viruses in the air.

  In order to diffuse the generated positive and negative ions over a wider range in order to remove mold, airborne bacteria and viruses, it is desirable to include a blowing means for discharging the ions through the ion generator. This is because in the case of the ion generator alone without using the air blowing means, the positive and negative ions generated in the ion generator may lose their charge and become ineffective before they sufficiently diffuse into the space.

  The method of removing mold, airborne bacteria, and viruses using this ion generator does not require a filter replacement and is not used in the corners of the space, compared to the methods using various types of filters that have been used with conventional air conditioning devices. There are advantages such as spreading effects, and there is a great advantage that a safe sterilization apparatus and deodorization apparatus can be realized.

In order to exert the effect of removing mold and airborne bacteria by positive and negative ions generated from the ion generating element, it is effective to increase the ion concentration to some extent, and positive ions are generated at a location about 10 cm from the blowing out of the positive and negative ion generating element. When the negative ion concentration is about 100,000 / cm ^3, it exhibits a sufficient removal effect against mold, airborne bacteria and viruses. The method for increasing the ion concentration is not particularly limited, and can be achieved, for example, by increasing the voltage applied to the ion generating element, changing the duty ratio of the pulse voltage application, or increasing the frequency. it can. A method of changing the wiring pattern of the ion generating electrode or the area of the ion generating electrode is also effective.

  FIG. 4 shows a schematic diagram of a conventional air purification device that is effective in removing mold, airborne bacteria, viruses, and the like. The air purification apparatus is composed of an ion generating element 101 and a blowing means 102. The air blowing means 102 may be omitted, but is used in most cases in order to effectively diffuse generated ions into the space.

  A dielectric 120 is provided on the surface of the ion generating element 101, and a dielectric electrode 121 as a first electrode is provided on the back side of the dielectric 120. The dielectric is provided so as to oppose the dielectric electrode 121 as the first electrode. On the surface of 120, an ion generating electrode 103 as a second electrode is attached. In FIG. 4, the shape of the ion generating electrode 103 as the second electrode is a net shape, but is not particularly limited, and a known needle shape, a linear shape, or the like may be used.

  The ion generating electrode 103 as the second electrode and the induction electrode 121 as the first electrode are connected to the high voltage pulse driving circuit 123 through the lead wire 122. The high voltage pulse drive circuit 123 is formed inside the ion generating element 101.

  In the ion generator having such a configuration, by driving the ion generator, that is, a pulse voltage having a peak value consisting of positive and negative voltages of, for example, 2.7 kV is applied between the ion generation electrode 103 and the induction electrode 121. Then, by driving the air blowing means 102, the air 104 passes through the passage 105, passes through the ion generating element 101, includes ions generated from the ion generating electrode 103 as the second electrode, and sufficiently contains the air 106. And will be released into space.

  The air 106 containing sufficient ions contains both positive ions and negative ions, and when released into the air, the effect of sterilizing airborne bacteria present in the air and deodorizing existing odor components. Can have a positive impact.

  Therefore, if such an ion generating device composed of the ion generating element 101 and the air blowing means 102 is applied to a housing facility, a building, or a moving means, positive and negative ions are supplied to the space, and mold, virus, and allergen components are removed. Inactivated and comfortable space can be provided.

In order to obtain a sufficient sterilizing / deodorizing effect in these internal spaces, the ion concentration at a position 10 cm away from the ion generating part of the air conditioner is set to 5000 to 10,000 ions / cm ^{3 for} both positive ions and negative ions. In the internal space from which positive and negative ions are released, the ion concentration may be about 2000 / cm ³ . It is very effective for sterilization and deodorization of internal space.
JP 2002-65836 A

  However, although the method using the effect of ions in the atmosphere using the creeping discharge phenomenon described above is effective against biological contamination causes, it is a) contamination by artificial chemical substance VOC (volatile organic compound). It was found that sufficient removal effect may not be confirmed.

  The influence of VOC (volatile organic compounds) existing in the space on the human body has become a major social problem in recent years. Especially in housing relations, it is a cause of sick house syndrome, and there is an urgent need to establish an effective removal technique. Here, VOC is a general term for volatile organic compounds, and there are very many types, and there are only 14 types of substances for which the Ministry of Health, Labor and Welfare defines target numerical values.

  Among these VOCs (volatile organic compounds), especially formaldehyde, acetaldehyde, toluene, and xylene are widely used in housing components. For the time being, it is necessary to remove these chemicals first to solve sick house syndrome. It has become an issue. There are various types of VOCs. For example, formaldehyde, acetaldehyde, toluene, xylene, ammonia, chloroform, paradichlorobenzene, styrene, nonanal, n-tetradecane, ethylbenzene, styrene, and the like can be mentioned. All of these substances are volatile and float in the indoor space with a certain concentration. It has a bad effect on humans.

  That is, VOC is a general term for various volatile organic compounds, and has a wide variety of molecular structures and types. Therefore, positive and negative ions generated from the ion generating element do not have an effect on all VOCs, and may not be effective at all. Therefore, it is not possible to use a method of effectively removing VOC in a space in a house or the like using only an ion generating element.

  On the other hand, with respect to VOC, by using a discharge phenomenon (for example, corona discharge) in which the plasma state is stronger than the creeping discharge phenomenon, VOC is effectively removed and decomposed by using not only positive and negative ions but also the plasma state. It is known that it can be done.

  For example, as a known technique, in Patent Document 2, as a method for stably and effectively reducing NOx and particulates in exhaust gas by low-temperature plasma under atmospheric pressure, a substrate layer made of a highly electrically conductive material is used. In addition, an electronic insulating layer made of a ceramic material and an electrode made of a heat-resistant high electrical conductive material are laminated, an AC power source is connected between the substrate layer and the electrode, and low temperature plasma under atmospheric pressure is used. It is disclosed as an exhaust gas treatment apparatus characterized by exciting residual oxygen in exhaust gas, carbon dioxide conversion by reaction of excited species and particulates, and decomposition of NOx by excited species.

  In Patent Document 3, plasma is generated using discharge at atmospheric pressure and room temperature, and the processing gas is effectively brought into contact with the plasma to decompose the processing gas. At the same time, using activated carbon or a shift converter, A device for removing volatile organic compounds in air that can detoxify secondary discharge products has been proposed. Specifically, a large number of capillary discharge tubes are connected between the processing gas inlet header and the outlet header, and needle electrodes are arranged opposite to each capillary discharge tube, and direct current, alternating current or A device for removing volatile organic compounds in the air using discharge plasma, characterized by connecting a pulse high voltage power supply, has been proposed.

  As shown in these Patent Documents 2 and 3, VOC existing in the space, which is a causative substance of sick house syndrome, can be effectively removed and decomposed by plasma due to a discharge phenomenon.

  As long as the plasma region can be effectively formed, the form of discharge is not limited. Among various discharge phenomena, the use of the corona discharge phenomenon (or barrier discharge phenomenon) is a viewpoint of the discharge state or cost. Is also preferable.

  Therefore, plasma generated at atmospheric pressure can be used for removal and decomposition of VOC existing in the indoor space by such a discharge phenomenon, but depending on the plasma due to these discharge phenomena, A) It is not effective to remove and inactivate fungi, planktonic bacteria, viruses and allergen components.

Therefore, as a method for removing dirt in the air in a residential environment,
A) Due to fungi, floating bacteria, viruses, etc.
B) Since it can be classified into those due to VOC (volatile organic compounds), mold fungi, airborne bacteria, viruses and allergen components are removed and inactivated by positive and negative ions generated by the ion generating element due to creeping discharge phenomenon. And a method of removing VOC by passing dirty air through a plasma region having a wide region generated by corona discharge (barrier discharge) generated between the second electrode and the third electrode. Therefore, a comfortable space can be provided.

  However, simply combining a biological contamination cause removing device such as a virus, mold or allergen component using an ion generating element by a creeping discharge method and a VOC removing device by a corona discharge method causes a problem of installation space. There is a case.

In addition, the installation space increases when power is installed in the device for removing the cause of biological contamination such as viruses, molds, and allergen components using ion generating elements based on the creeping discharge method and the VOC removing device using the corona discharge (barrier discharge) method. In addition, there were problems such as an increase in power consumption.
JP-A-8-105317 JP, 10-325, A In light of the above-mentioned subject, the present invention can remove both the two kinds of pollution causes which exist in space effectively, and can save space and can also reduce power consumption. The purpose is to provide.

  In order to achieve the above object, the present inventor has found the following items and completed the present invention after extensive research. That is, in the air purifying apparatus according to the present invention, an element including three electrodes (first electrode, second electrode, third electrode) is provided between the first electrode and the second electrode due to a creeping discharge phenomenon. It works effectively against mold, airborne bacteria, viruses, allergen components, etc. that exist in the space, and at the same time, the corona discharge (barrier discharge) phenomenon occurs between the second electrode and the third electrode. It is intended to be able to show an effective action on VOC existing in the.

According to the air purification device having the above configuration, two types of contamination existing in the space,
A) Caused by mold, planktonic bacteria, viruses or allergen components.
B) Artificial chemical substance VOC (volatile organic compound).
Both causes of contamination can be effectively removed.

As a method for removing dirt in the air in a residential environment, etc., a) largely due to mold fungi, planktonic bacteria, viruses, allergen components, etc.
B) Since it can be classified into those due to VOC (volatile organic compounds), there are a method for removing mold fungi, airborne bacteria and viruses by positive and negative ions by an ion generating element, and a method for removing VOC by corona discharge. By combining them, it is possible to completely remove both the cause of biological contamination in the air and VOC in residential spaces and the like, and a clean and comfortable space can be provided.

  Furthermore, in the air purification apparatus according to the present invention, a power source that generates a creeping discharge phenomenon that is effective against biological contamination causes between the first electrode and the second electrode, and the second electrode and the third electrode. It is characterized in that each power source for generating a corona discharge (barrier discharge) phenomenon that is effective against an inanimate contamination cause such as VOC can be independently operated.

  That is, as described above, the causes of contamination in a general space are a) biological contamination causes such as molds, viruses and allergen components, and a) abiotic contamination causes such as VOC (volatile organic compounds). However, the mixing ratio of these varies depending on the respective housing environment. In some cases, the percentage of biological contamination is high, while in other cases, the percentage of abiotic pollution is high.

  Therefore, when the ratio of biological contamination is high, a power source that generates a creeping discharge phenomenon that has an effect on the biological contamination between the first electrode and the second electrode is connected to the second electrode and the second electrode. More corona discharge (barrier discharge) phenomenon that is effective against inanimate contamination causes such as VOC is generated between the three electrodes. As a method for this, each power supply can be adjusted.

  Conversely, when the proportion of inanimate contamination is high, a power source that generates a creeping discharge phenomenon that has an effect on the biological contamination between the first electrode and the second electrode is connected to the second electrode. A smaller number of corona discharge (barrier discharge) phenomena that are effective against inanimate causes such as VOCs are generated between the third electrodes.

  By adjusting in this way, it is possible to achieve a reduction in power consumption without unnecessarily operating the power source while achieving the cleanest space.

  As described above, according to the present invention, positive and negative ions are generated from the ion generating element by the creeping discharge method, and a plasma region is formed by the corona discharge method, causing biological contamination such as mold, virus, and allergen components present in the space. In addition, it can effectively remove and inactivate both inanimate artificial chemical substances such as VOC by the action of plasma, and can exhibit a comfortable air purification action.

  In addition, biological and abiotic pollution causes can be controlled by independent control of creeping discharge phenomena and corona discharge (barrier discharge) phenomena, so the indoor space can always be optimally cleaned. It is. In addition, power consumption can be suppressed, which is effective. Furthermore, it is possible to reduce the installation space by combining these.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an air purifying apparatus which is effective against both a biological contamination cause and an inanimate contamination cause such as VOC according to the present invention, and FIG. 2 is a first electrode, a dielectric, and a second electrode of FIG. It is the schematic when an electrode and a 3rd electrode are seen from another direction.

  In the air purification apparatus 1 according to the present invention, a first electrode 2, a dielectric 3, and a second electrode 4 are disposed in order, and a space 5 is disposed in the vicinity of the second electrode 4 and facing the second electrode 4. A third electrode 6 is disposed, and an air blowing means 7 is provided outside thereof.

  The air blowing means 7 plays a role of supplying air A including inanimate and biological contamination causes to the regions where the first electrode 2, the second electrode 4, the third electrode 6, and the space 5 are formed. The blower unit 7 includes, for example, a blower motor and a blower fan. The air A sent by the blower 7 is discharged as the cleaned air B through the creeping discharge part and the corona (barrier) discharge part.

  Moreover, between the 1st power supply 8 which generates the creeping discharge phenomenon which shows an effect with respect to the cause of biological contamination between the 1st electrode 2 and the 2nd electrode 4, and between the 2nd electrode 4 and the 3rd electrode 6. And a second power source 9 that generates a corona discharge (barrier discharge) phenomenon that is effective against an inanimate contamination cause such as VOC.

  These power supplies 8 and 9 can be adjusted independently. For example, the voltage control between the first electrode 2 and the second electrode 4 and the voltage control between the second electrode 4 and the third electrode 6 are performed independently. The degree of change in voltage applied between the first electrode 2 and the second electrode 4 and the degree of change in voltage applied between the second electrode 4 and the third electrode 6 can be synchronized.

  In addition, the first power supply 8 and the second power supply 9 can be shared, and the potentials of both the first electrode 2 and the third electrode 6 can be increased or decreased with respect to the second electrode 4. Further, an AC voltage can be applied between the first electrode 2 and the second electrode 4, and a DC voltage can be applied between the second electrode 4 and the third electrode 6.

  Furthermore, the control of the creeping discharge phenomenon caused between the first electrode 2 and the second electrode 4 and the control of the corona discharge or the barrier discharge caused between the second electrode 4 and the third electrode 6 are independent or It can also be performed in conjunction.

  FIG. 3 shows a schematic view of a site causing a creeping discharge phenomenon, (a) shows a schematic side view thereof, and (b) shows a schematic front view. Among these, the A) stage shows the arrangement relationship between the first electrode 2 and the dielectric 3, and the B) stage shows the arrangement of the second electrode 4 and the dielectric 3 when viewed through the same plane as the first electrode 2. The relationship C shows the state where the arrangement relationship of the steps A) and B) is synthesized.

  As shown in FIG. 3, the region using the discharge phenomenon composed of the first electrode 2, the dielectric 3, and the second electrode 4 generates positive and negative ions that have a removal / inactivation effect against the cause of biological contamination. To do. The first electrode 2 acts as a dielectric electrode, and an ion generating electrode as the second electrode 4 is provided on the surface of the dielectric so as to face the dielectric electrode. The shape of the ion generating electrode as the second electrode 4 is not particularly limited as long as it can effectively release positive and negative ions. Furthermore, in order to generate positive and negative ions more effectively, an electrode pattern shape, an edge shape, a material, and the like can be appropriately determined.

  The dielectric 3 can be used as a material as long as it causes a polarization phenomenon, but alumina is preferably used.

  It consists of the first electrode 2, the dielectric 3, and the second electrode 4, and causes creeping discharge between the first electrode 2 and the second electrode 4, thereby generating positive and negative ions. In the case of containing both positive ions and negative ions at the same concentration, when ions are released into the air, an inactivation effect on mold and allergen components is exhibited.

The effect of positive and negative ions is described in detail in Japanese Patent Application Laid-Open No. 2002-95731. Here, the operation principle will be briefly described. The principle of operation is that of a second electrode disposed between a first electrode and a dielectric. By applying an alternating voltage between the electrodes, positive ions and negative ions are generated from the first electrode (ion generating electrode). H ⁺ (H ₂ O) _m (m is an arbitrary natural number) is generated as the positive ion, and O ₂ ⁻ (H ₂ O) _n (n is an arbitrary natural number) is generated most stably as the negative ion. . This ion species has been confirmed by precise measurement by mass spectrometry.

When these positive ions and negative ions are simultaneously generated in the air, a chemical reaction occurs to generate hydrogen peroxide H ₂ O ₂ or a hydroxy radical / OH which is an active species. These hydrogen peroxide H ₂ O ₂ or hydroxy radicals · OH exhibit extremely strong activity, which can remove and inactivate airborne microbes, viruses, pollen and mite allergens. .

  Therefore, in order to exhibit the above-mentioned effect, both positive ions and negative ions must be supplied to the space. Further, in order to spread the above-described effect to the space, it is necessary to release air containing positive and negative ions to the space. Therefore, the blowing unit 7 is provided, and the ions are spread by the air flow from the blowing unit 7. The method is preferred.

  The second electrode 4 and the third electrode 6 are disposed to face each other with a space 5 therebetween. A corona discharge (barrier discharge) phenomenon can be generated between the second electrode 4 and the third electrode 6. At this time, a plasma region is formed in the space 5. In the range in which such a plasma region is formed, VOC that is a causative substance of sick house syndrome can be removed and decomposed among the causes of contamination in the air.

  In order to generate a corona discharge (barrier discharge) phenomenon, a voltage is applied between the second electrode 4 and the third electrode 6. In order to cause a discharge phenomenon, the distance between the second electrode 4 and the third electrode 6 needs to be set appropriately. Specifically, an effective corona discharge (barrier discharge) phenomenon can be caused by setting the thickness to about 0.5 mm to 20 mm.

  The shape of the third electrode 6 facing the second electrode 4 is not particularly limited, and a needle shape is well known. However, if the degree of overlap between the second electrode 4 and the third electrode 6 increases. Since the plasma region is formed widely, it is effective for removing and decomposing VOC. In the present embodiment, the third electrode 6 has an elongated plate-like electrode shape. Moreover, since the overlap part with the 2nd electrode 4 is wide, the 3rd electrode 6 becomes a shape where a plasma area | region is easy to be formed.

  FIG. 2 schematically shows the first electrode, the dielectric, the second electrode, and the third electrode when viewed from a direction different from that in FIG.

  A creeping discharge phenomenon is caused between the first electrode 2 and the second electrode 4 with the dielectric 3 interposed therebetween. A corona discharge (barrier discharge) phenomenon is caused between the second electrode 4 and the third electrode 6 facing the space with a space. The second electrode 4 and the third electrode 6 can increase the plasma region of corona discharge (barrier discharge) by increasing the overlap region. Therefore, when passing through the space 5 between the second electrode 4 and the third electrode 6, the cause of contamination by the inanimate VOC existing in the space 5 is effectively removed and decomposed.

  Thus, by combining these creeping discharges and corona discharges (barrier discharges), it is possible to effectively remove the inanimate and biological contamination causes of the space. The following three operation modes are conceivable depending on the combination of both discharge phenomena.

(First operation mode)
The first operation mode is an operation mode in which driving is performed to effectively generate discharge between the second electrode 4 and the third electrode 6. In this operation mode, the effect is particularly great against inanimate dirt out of inanimate dirt and biological dirt in the air. For inanimate soil, a plasma region is formed between the second electrode 4 and the third electrode 6 by a corona discharge (barrier discharge) phenomenon, and air is passed through this region to eliminate the cause of inanimate contamination. To do.

(Second operation mode)
The second operation mode is particularly effective for biological dirt among abiotic dirt and biological dirt in the air. For biological contamination, positive and negative ions are generated by a creeping discharge phenomenon between the first electrode 2, the dielectric 3, and the second electrode 4, and positive and negative ions are diffused and released into the space 5 by the blowing means 7. This removes and inactivates biological dirt.

(Third operation mode)
The third operation mode is an operation mode for effectively removing both inanimate and biological dirt in the air. In this operation mode, a corona discharge (barrier discharge) phenomenon is caused between the second electrode 4 and the third electrode 6 to remove / decompose an inanimate contamination cause such as VOC. A creeping discharge phenomenon is caused between the electrodes 4 to remove and inactivate the cause of biological contamination.

  In addition, in the case where the degree of mixing of the inanimate pollution cause and the biological pollution cause is known (for example, it is known that the cause of the contamination in a certain indoor space is mostly caused by VOC), the cause of the inanimate pollution is It is effective to increase the degree of removal / decomposition. In this case, the degree of the corona (barrier) discharge phenomenon between the second electrode 4 and the third electrode 6 is increased (in contrast, the degree of the creeping discharge phenomenon between the first electrode 2 and the second electrode 4 is increased). It is effective to increase the effect of removal / decomposition against inanimate causes of contamination.

  In order to change the inanimate pollution cause and the degree of action on the biological pollution cause, it is possible to change the degree of each discharge phenomenon. That is, if the degree of corona discharge (barrier discharge) is increased, the effect against abiotic pollution causes is increased. Conversely, if the degree of creeping discharge is increased, the effect against biological contamination causes is increased.

  Further, as a method for increasing the degree of discharge, the degree of discharge is increased by a method of increasing the applied voltage or, if it is a pulse voltage, increasing the period and rise time.

  Thus, in this embodiment, the corona discharge which consists of the ventilation means 7, the creeping discharge part which consists of the 1st electrode 2, the dielectric material 3, and the 2nd electrode 4, and the 2nd electrode 4 and the 3rd electrode 6 ( By combining the (barrier discharge) part, it is possible to exhibit an effect of removing both inanimate and biological stains floating in the air and to exhibit a comfortable air cleaning action.

  In addition, this invention is not limited to the said embodiment, Of course, correction and a change can be added within the scope of the present invention.

Schematic of the air purification apparatus which is embodiment of this invention Schematic when the first electrode, dielectric, second electrode and third electrode of FIG. 1 are viewed from different directions (A) is a schematic side view of a portion that causes a creeping discharge phenomenon, and (b) is a schematic front view thereof. Schematic diagram of a conventional air purification device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Air purification apparatus 2 1st electrode 3 Dielectric material 4 2nd electrode 5 Space 6 3rd electrode 7 Blower means 8 1st power supply 9 2nd power supply

Claims (9)

An air purifying device, wherein a first electrode, a dielectric, and a second electrode are sequentially disposed, and a third electrode is disposed at a position facing the second electrode through a space. The air purification apparatus according to claim 1, wherein a creeping discharge phenomenon is caused between the first electrode and the second electrode, and a corona discharge or a barrier discharge is caused between the second electrode and the third electrode. The air purification device according to claim 1, wherein voltage control between the first electrode and the second electrode and voltage control between the second electrode and the third electrode are performed independently. 4. The degree of change in voltage applied between the first electrode and the second electrode is synchronized with the degree of change in voltage applied between the second electrode and the third electrode. The air purification apparatus in any one of. A power source that applies a voltage between the first electrode and the second electrode and a power source that applies a voltage between the second electrode and the third electrode are shared, and the first electrode and the second electrode The air purifier according to claim 1 or 2, wherein the potential of both of the three electrodes is large or small. The AC voltage is applied between the first electrode and the second electrode, and the DC voltage is applied between the second electrode and the third electrode. Air purification device. The cause of biological contamination is removed and inactivated by positive and negative ions generated by the creeping discharge phenomenon caused between the first electrode and the second electrode, and corona discharge or barrier discharge between the second electrode and the third electrode A volatile organic compound is removed and decomposed, The air purification apparatus in any one of Claims 1-6 characterized by the above-mentioned. The control of the creeping discharge phenomenon caused between the first electrode and the second electrode and the control of the corona discharge or the barrier discharge caused between the second electrode and the third electrode are performed independently or in conjunction with each other. The air purifier according to claim 1. The air purification apparatus according to any one of claims 1 to 8, further comprising a blowing unit.

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