JP7619861B2 - Air Purifier - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act Published on the website of IPROS Co., Ltd. on August 24, 2020 Published on the website of Nihon Keizai Shimbun Inc. on September 29, 2020 Published in a newspaper by Nihon Keizai Shimbun Inc. on September 30, 2020 Published on Amano Corporation's company website on September 30, 2020 Published at the 3rd Care & Nursing EXPO held from October 14, 2020 to October 16, 2020

The present invention relates to an air purifier that electrically charges particles in the air, including viruses and bacteria, to collect them and sterilize and/or inactivate them.

Conventionally, devices have been known that capture airborne particles containing viruses and bacteria by charging them with a corona discharge generated by applying a high voltage.

For example, Patent Document 1 discloses a so-called two-stage electrostatic precipitator that has a separate charging section (the "ionization electrode" in Patent Document 1) and dust collection section (the "high-voltage dust collection unit" in Patent Document 1). This electrostatic precipitator is provided with an ultraviolet lamp that corresponds to the dust collection section, and particles including viruses and bacteria that are collected by the dust collection section are inactivated (sterilized) by irradiating ultraviolet rays from this ultraviolet lamp.

JP 2006-175377 A

However, in the electrostatic precipitator described in Patent Document 1, particles containing viruses and bacteria adhere to the charging unit as well, but no germicidal lamp (ultraviolet lamp) is provided for the charging unit. Therefore, when workers remove the charging unit or dust collection unit from the device during maintenance work such as inspection and cleaning, there is a risk that they will inhale particles containing inactivated viruses and bacteria. In addition, since viruses and bacteria may adhere to places other than the dust collection unit (for example, the charging unit or the wall surface of the flow path), if the viruses and bacteria are not captured by the dust collection unit, they may be discharged to the outside. Furthermore, there is a problem that the scattering and diffusion of viruses and bacteria around the outside of the device may result in inactivated viruses and bacteria entering the human body and causing health damage such as illness.

In addition, in the electric dust collector described in Patent Document 1, ultraviolet light is emitted from the ultraviolet lamp only from one side of the dust collection section. Therefore, there is a possibility that the ultraviolet light will not reach the other side of the dust collection section, and there is a problem that it is difficult to reliably inactivate the viruses and bacteria collected by the dust collection section.

The present invention has been made to solve the above problems, and aims to provide an air purifier that can reliably sterilize and/or inactivate particles, including viruses and bacteria, in the charging section and dust collection section.

To solve the above problems, the first air purifier of the present invention is an air purifier that charges particles in the air, collects them, and then sterilizes and/or inactivates them, and is characterized in that it includes a charging unit that applies a high voltage to charge the particles, a dust collecting unit that collects the particles charged by the charging unit, and a sterilization unit that sterilizes and/or inactivates the particles by irradiating them with ultraviolet light, and the sterilization units are arranged opposite each other at positions sandwiching the charging unit and the dust collecting unit.

According to the first air purifying device of the present invention, particles that have adhered to and been collected in the charging section and dust collecting section can be reliably inactivated (sterilized). Furthermore, even when removing the charging section or dust collecting section from inside the device for maintenance or the like, the charging section or dust collecting section can be safely removed from the device, and the leakage of uninactivated viruses and bacteria from the device can be prevented.

In the second air purifier of the present invention, the sterilization unit is disposed in a position close to the charging unit and the dust collecting unit and away from the air flow passage.

According to the second air purifier of the present invention, the sterilization unit is located in a position where air does not circulate, so particles in the circulating air can be prevented from adhering to the sterilization unit, and the sterilization performance of the sterilization unit can be maintained.

The third air purifier of the present invention has a charging section in which a plurality of support substrates supporting a discharge electrode to which a high voltage is applied are arranged in parallel along the air flow direction, and a dust collection section in which a high voltage electrode plate to which a high voltage is applied and a dust collection electrode plate for collecting particles repelled by the high voltage applied to the high voltage electrode plate are arranged in parallel along the air flow direction, and the sterilization section is equipped with an ultraviolet lamp, and the ultraviolet lamp is arranged in a direction intersecting the support substrate, the high voltage electrode plate, and the dust collection electrode plate.

According to the third air purifier of the present invention, the ultraviolet light irradiated from the ultraviolet lamp is reflected and refracted between the surfaces of each electrode plate, allowing the ultraviolet light to reach the deepest part of the electrode plate.

In the fourth air purifier of the present invention, the support substrate, the high voltage electrode plate, and the dust collection electrode plate are made of aluminum.

The fourth air purifier of the present invention has excellent UV reflection efficiency, allowing UV rays to reach farther distances.

The fifth air purifier of the present invention has an opening for ultraviolet irradiation at a location where the charging unit and the dust collecting unit face the sterilizing unit.

The fifth air purifier of the present invention allows ultraviolet light to be efficiently irradiated through the openings to the inside of the charging section and dust collecting section.

In the sixth air purifier of the present invention, the sterilizing section is provided with a reflector that reflects the irradiated ultraviolet light toward the charging section and the dust collecting section, and the reflector is made of aluminum and is positioned opposite the opening for irradiating ultraviolet light.

The sixth air purifier of the present invention is economical because it is equipped with a reflector that reflects ultraviolet light to both the charging section and the dust collecting section. In addition, because the reflector is provided to face the openings of the charging section and the dust collecting section through which ultraviolet light passes, more ultraviolet light can be irradiated to the charging section and the dust collecting section. Furthermore, being made of aluminum increases the efficiency of reflecting ultraviolet light.

The seventh air purifying device of the present invention has a reflector disposed between the polluted air area and the clean air area, a communication section that can open and close and allows communication between the polluted air area and the clean air area, and an ultraviolet power supply section that supplies power to an ultraviolet lamp provided in the sterilizing section is provided in the clean air area.

According to the seventh air purifier of the present invention, operations such as replacing the glow lamp (ignition tube) and switching the frequency (50 Hz, 60 Hz) in the ultraviolet power supply unit can be performed from the contaminated air area side through the communication part without removing the cover of the device that covers the sterilization part.

In the eighth air purifier of the present invention, the sterilization unit irradiates ultraviolet light after the operation of the device is stopped.

According to the eighth air purifier of the present invention, the charging unit and dust collecting unit are always irradiated with ultraviolet light after the operation of the device is stopped, and viruses and bacteria are killed and/or inactivated. Therefore, even if the inspection door is opened and the charging unit and dust collecting unit are removed from the device after the operation of the device is stopped, there is no risk of viruses and bacteria that have not been killed and/or inactivated being dispersed outside the device.

In a ninth air purifying device of the present invention, the dose of ultraviolet light irradiated from the sterilizing unit is set to 25 mJ/cm2 or ^more at the center of the irradiated surface.

The ninth air purifier of the present invention can sterilize and/or inactivate major viruses and bacteria, including coronaviruses and influenza viruses.

The tenth air purifier of the present invention has insulators provided in the charging section and the dust collecting section that are located in places that are not irradiated with ultraviolet light from the sterilizing section.

The tenth air purifier of the present invention can prevent deterioration of the insulators due to ultraviolet rays.

In the eleventh air purifier of the present invention, the dust collection section includes a high-voltage electrode plate to which a high voltage of 4 to 8 kV is applied and a dust collection electrode plate that captures particles repelled by the high voltage applied to the high-voltage electrode plate, which are arranged in parallel with a gap of 5 to 10 mm, and the sterilization section includes an ultraviolet lamp that is arranged 20 to 50 mm away from the high-voltage electrode plate and the dust collection electrode plate in a direction perpendicular to each of the high-voltage electrode plate and the dust collection electrode plate, the wavelength of the ultraviolet light irradiated from the ultraviolet lamp is 240 to 260 nm, and the output of the ultraviolet lamp is 4 to 10 W.

The eleventh air purifier of the present invention can most effectively inactivate and/or kill viruses and bacteria.

The twelfth air purifier of the present invention comprises an intake port, the charging unit, the dust collection unit, the sterilization unit, an exhaust port, and a suction fan. The charging unit charges dust, particles, and viruses contained in the air sucked in from the intake port by the suction fan, and the dust collection unit collects the dust, and clean air is discharged from the exhaust port.

The twelfth air purifier of the present invention can reliably charge and capture particles containing viruses and bacteria in the air, thereby improving dust collection efficiency.

According to the present invention, viruses and bacteria that adhere to and are collected in the charging section and dust collection section are reliably inactivated (sterilized), so that the charging section and dust collection section can be safely removed from the device, and various excellent effects can be obtained, such as preventing the risk of uninactivated viruses and bacteria leaking, scattering, or spreading around the outside of the device.

1 is a side view showing an air purifying device according to an embodiment of the present invention. 1 is a perspective view showing a main part of an air purifying device according to an embodiment of the present invention. FIG. 2 is a plan view showing a charging unit and a dust collecting unit of the air purifying device according to the embodiment of the present invention. FIG. 2 is a perspective view showing an upper sterilization section of the air purifying device according to the embodiment of the present invention. FIG. 2 is a perspective view showing a lower sterilizing section of the air purifying device according to the embodiment of the present invention. 1 is a side view showing an air purifying device according to an embodiment of the present invention. 1 is a plan view showing an air purifying device according to an embodiment of the present invention. FIG. 4 is a diagram showing the relationship between viruses/bacteria and a sterilization dose in the air purifying device according to the embodiment of the present invention. 1 is a block diagram showing an air purifying device according to an embodiment of the present invention. 4 is a flowchart showing the overall operation of the air purifying device according to the embodiment of the present invention. 5 is a flowchart showing the operation of an ultraviolet sterilization mode of the air purifying device according to the embodiment of the present invention. 4 is a flowchart showing the operation of an ozone sterilization mode of the air purifying device according to the embodiment of the 4 is a flowchart showing the operation of an ozone/ultraviolet sterilization mode of the air purifying device according to the embodiment of the present invention. 5 is a flowchart showing the operation of an exhaust mode of the air purifying device according to the embodiment of the present invention. 4 is a time chart showing the operation of the air purifying device according to the embodiment of the present invention.

The following describes an embodiment of the present invention with reference to the drawings.

As shown in FIG. 1, the air purifying device 30 according to this embodiment has an intake chamber 1, a main body 2, and an exhaust chamber 3 arranged in that order along the air flow direction (the direction of the arrow in FIG. 1). The intake chamber 1 is formed in a flat box shape, with an intake port 4 opening on its outer surface. The exhaust chamber 3 is also formed in a box shape with a chamfered inclined surface on the lower side, with an exhaust port 5 opening on its upper surface.

Shutters 73 are provided as sealing means 6 at positions adjacent to the intake chamber 1 of the main body 2 and at positions adjacent to the exhaust port 5 of the exhaust chamber 3. The sealing means 6 (shutter 73) can close the intake port 4 and the exhaust port 5 to seal the inside of the main body 2. Note that in this embodiment, shutters 73 are provided as the sealing means 6, but an opening/closing valve such as a butterfly valve or a damper may also be used.

Inside the main body 2, the prefilter 7, the charging section 8, the dust collecting section 9, the ozone decomposition section 10, and the suction fan 11 are arranged in series in the air flow direction (the direction of the arrow in FIG. 1), and the charging section 8 and the dust collecting section 9 form an electric dust collecting section 19. Inside the main body 2, sterilizing sections 12 that irradiate ultraviolet rays are arranged above and below the charging section 8 and the dust collecting section 9 of the electric dust collecting section 19, respectively, at positions spaced apart from the air flow passage. Covers 49 are attached to the outside of the upper and lower sterilizing sections 12 so as to cover the sterilizing sections 12. In this embodiment, the electric dust collecting section 19 is a two-stage type in which the charging section 8 and the dust collecting section 9 are arranged separately, but the electric dust collecting section 19 is not limited to a two-stage type, and may be a one-stage type in which the charging section 8 and the dust collecting section 9 are integrated.

The prefilter 7 is a roughly rectangular coarse filter (not shown), and the ozone decomposition section 10 is formed by storing a porous substance such as activated carbon or zeolite that adsorbs ozone inside the unit. In this embodiment, an activated carbon unit is provided as the ozone decomposition section 10, but a catalyst that decomposes ozone, such as a photocatalyst, may also be used.

As shown in Figures 2 and 3, the charging section 8 includes an upstream ground electrode plate 14 arranged upstream in the air flow direction, a downstream ground electrode plate 15 arranged parallel to the upstream ground electrode plate 14 downstream in the air flow direction from the upstream ground electrode plate 14, and a discharge electrode member 16 arranged between the upstream ground electrode plate 14 and the downstream ground electrode plate 15. The upstream ground electrode plate 14 and the downstream ground electrode plate 15 are connected to earth. The discharge electrode member 16 includes a support substrate 17 and a discharge electrode 18 held by the support substrate 17. An opening 13 for ultraviolet irradiation is formed in the upper and lower parts of the charging section 8 at locations facing the sterilization section 12.

A rectangular frame 20 is formed on the outer periphery of the charging section 8. The frame 20 is configured with left and right support columns 21, 22 that are erected facing each other, an upper connecting member 23 that is installed between the upper ends of the support columns 21, 22, and a lower connecting member 24 that is installed between the lower ends of the support columns 21, 22. An upper mounting member 25 is horizontally supported below the upper connecting member 23 on the upper ends of the left and right support columns 21, 22 via an insulator 26 (made of resin), and a lower mounting member 27 is horizontally supported on the lower ends of the left and right support columns 21, 22 via an insulator 28 (made of resin). As a result, the upper mounting member 25 and the lower mounting member 27 are supported in an insulated state by the frame 20.

The lower mounting member 27 has multiple cutouts (not shown) formed in the shape of upper and lower slits at a predetermined interval. A power supply member 29 (see FIG. 1) is attached to the right end of the upper mounting member 25, and a high-voltage power supply unit 72 (see FIG. 9) is connected to the power supply member 29.

The upstream ground electrode plate 14 is formed as a flat rectangular plate of conductive metal (stainless steel in this embodiment) with a large number of round hole-shaped upstream openings 31, and is attached to the frame 20 in a direction that blocks air flow (perpendicular to the air flow direction). The upstream openings 31 are arranged vertically in a series and in multiple rows (14 openings x 14 rows = 196 openings in this embodiment), and are arranged at regular intervals in a staggered pattern so that half the upstream openings 31 are shifted vertically between adjacent rows on the left and right.

The downstream ground electrode plate 15 is formed in a flat shape from a single rectangular conductive metal (stainless steel in this embodiment) with a large number of circular downstream openings 32 formed therein, and is attached to the frame 20 in a direction that blocks air flow (perpendicular to the direction of air flow). The downstream openings 32 of the downstream ground electrode plate 15 are arranged vertically in a row (7 openings x 7 rows = 49 openings in this embodiment), and are aligned at regular intervals. The individual area and total area of the downstream openings 32 of the downstream ground electrode plate 15 are both larger than the upstream openings 31 of the upstream ground electrode plate 14.

3 and 6, the support substrate 17 is made of aluminum and formed into a long plate shape. The support substrate 17 is provided between every other row of upstream openings 31 adjacent to the left and right of the upstream ground electrode plate 14, and is arranged to match the center of the downstream opening 32 of the downstream ground electrode plate 15. In this embodiment, seven support substrates 17 are provided. As a result, the support substrates 17 are arranged so as not to interfere with the upstream openings 31 of the upstream ground electrode plate 14 when viewed from the air flow direction, and the distance between the support substrates 17 is maintained to a degree that does not cause abnormal discharge. In this embodiment, the support substrates 17 are arranged parallel to the air flow direction and perpendicular to the upstream ground electrode plate 14 and the downstream ground electrode plate 15.

The upper end of the support substrate 17 is supported by the upper mounting member 25 by a spring (not shown) interposed between the upper mounting member 25 and a hook hole (not shown) formed in the upper end. The lower end of the support substrate 17 is formed into a hook shape and is supported by the lower mounting member 27 by being hooked into the notch.

The support substrate 17 is integrally formed with a crimping portion 33, which is configured to include an upstream crimping portion 33a extending toward the upstream opening 31 and a downstream crimping portion 33b extending toward the downstream opening 32. The upstream crimping portions 33a are formed in a number corresponding to the number of adjacent two rows of upstream openings 31 (in this embodiment, 14 pieces x 2 rows = 28 pieces), and the downstream crimping portions 33b are formed in a number corresponding to the number of downstream openings 32 in one row (in this embodiment, 10 pieces). The support substrate 17 may be made of any material having electrical conductivity, but is preferably made of a copper plate or an aluminum plate in consideration of the workability of the crimping process, which requires extensibility.

The discharge electrode 18 is a discharge brush 34 made of a number of wires bundled together, and is configured with an upstream discharge electrode 18a held by an upstream crimping portion 33a so as to extend from the support substrate 17 toward the upstream ground electrode plate 14 and arranged corresponding to each upstream opening 31, and a downstream discharge electrode 18b held by a downstream crimping portion 33b so as to extend from the support substrate 17 toward the downstream ground electrode plate 15 and arranged corresponding to each downstream opening 32. Note that although the discharge electrode 18 in this embodiment is formed in a brush shape, it may also be in the shape of a needle, wire, or protrusion.

The upstream discharge electrode 18a is formed by extending from the upstream crimped portion 33a of each stage toward the upstream ground electrode plate 14 (i.e., upstream of the support substrate 17 in the air flow direction) and bending in a staggered manner. The central tip of the bundle of discharge brushes 34 of the upstream discharge electrode 18a is arranged on the center line of the upstream openings 31 adjacent to both the left and right sides of the support substrate 17, spaced apart from the upstream openings 31 without penetrating the openings 31. As a result, as shown in FIG. 3, the tip of the discharge brush 34 of the upstream discharge electrode 18a and the periphery of the upstream opening 31 of the upstream ground electrode plate 14 maintain a substantially constant discharge gap, and the charged area EA1 formed by corona discharge between the upstream discharge electrode 18a and the upstream opening 31 has a substantially conical shape, so that a uniform and stable discharge state can be formed.

The downstream discharge electrode 18b extends horizontally and linearly from the downstream crimped portion 33b of each stage toward the downstream ground electrode plate 15 (i.e., downstream of the support substrate 17 in the air flow direction), and the tip of the discharge brush 34 of the downstream discharge electrode 18b is disposed on the center line of the downstream opening 32, spaced apart from the downstream opening 32 without penetrating the downstream opening 32. As a result, as shown in FIG. 3, a constant discharge gap is maintained between the tip of the discharge brush 34 of the downstream discharge electrode 18b and the periphery of the downstream opening 32, and the charged area EA2 formed by corona discharge between the downstream discharge electrode 18b and the downstream opening 32 forms an approximately conical shape facing in the opposite direction to the upstream side, so that a uniform and stable discharge state can be formed.

The discharge brush 34 of the discharge electrode 18 has a bundled portion formed into a brush shape by bundling a large number of fibrous wires. The wires are made of non-magnetic stainless steel fibers with a diameter of 12 μm, and the stainless steel used is SUS304, which contains 18% Cr and 8% Ni, and is highly marketable, economical, and corrosion-resistant. Note that other materials may be used for the wires, as long as they are non-magnetic stainless steel, such as SUS316, which contains 18% Cr, 12% Ni, and molybdenum (Mo) added.

One discharge electrode 18 is formed by bundling, for example, about 100 wires. The discharge electrode 18 may be formed by bundling 10 to 200 wires with a diameter of 5 to 25 μm. The discharge electrodes 18 are provided in a state in which they extend from the support substrate 17 toward the upstream and downstream sides in the flow direction. When a high voltage is applied to the discharge electrode 18, in addition to the repulsion between the wires, the flowing air directly hits the tips of the wires, so that the wires are separated from the bundled part, and a corona discharge can be generated in a strong electric field. The length of the protrusion of the wires from the crimped part is preferably about 5 mm for the number of bundled wires and wire diameter described above. In addition, in FIG. 3, the tip side of the wire of the discharge electrode 18 is shown in an open state, which shows the usage state in which a high voltage is applied. This is because when a high voltage is applied, electric charges corresponding to the polarity of the high voltage are accumulated in each wire, causing the wires to repel each other.

In addition, corona discharge actually occurs only in a portion of the many wires, and because corona discharge alternates between these and other wires from moment to moment, the roughly conical shape of the charged areas EA1 and EA2 changes slightly from moment to moment.

As described above, the discharge brushes 34 of the upstream discharge electrode 18a and downstream discharge electrode 18b form an almost linear bundle when no high voltage is applied, and the center of the discharge brush 34 is the center of the brush bundle. Strictly speaking, when a high voltage is applied, the center of the discharge brush 34 bundle changes from moment to moment, but for the sake of simplicity, this point is not taken into consideration here.

2 and 3, the dust collection section 9 is formed by alternately arranging a plurality of aluminum dust collection electrode plates 35 connected to earth and aluminum high-voltage electrode plates 36 connected to the high-voltage power supply section 72 (see FIG. 9) at equal intervals. The dust collection electrode plates 35 are arranged in a vertical position in a direction perpendicular to the downstream ground electrode plate 15 downstream of the downstream ground electrode plate 15 in the air flow direction, and the high-voltage electrode plate 36 is arranged in a vertical position so as to face the dust collection electrode plate 35. At the top and bottom of the dust collection section 9, openings 39 for ultraviolet irradiation are formed at locations facing the sterilization section 12. When the high voltage applied to the dust collection section 9 is 4 to 8 kV, the distance S (see FIG. 7) between the high-voltage electrode plate 36 and the dust collection electrode plate 35 is preferably 5 to 10 mm, and most preferably 6.8 mm. If the gap S between the high voltage electrode plate 36 and the dust collection electrode plate 35 is too narrow, insulation breakdown (sparks) is more likely to occur, and if the gap S is too far away, there is a risk of the dust collection capacity decreasing.

As shown in Figures 1, 2, 6, and 7, a rectangular frame 37 is formed on the outer periphery of the dust collection unit 9, and left and right side plates 38 are attached to the frame 37 so as to stand facing each other. Four connecting shafts 40 are horizontally installed between the left and right side plates 38, and these connecting shafts 40 penetrate the dust collection electrode plate 35 and the high-voltage electrode plate 36.

The first power supply member 41 and the second power supply member 42, and the upper mounting member 43 and the lower mounting member 44 are attached to the upper and lower outer surfaces of the left and right side plates 38, respectively. A first insulator 45 (made of resin) is interposed between the first power supply member 41 and the upper mounting member 43, and a second insulator 46 (made of resin) is interposed between the second power supply member 42 and the lower mounting member 44, and each insulator 45, 46 is disposed in a location where it is not irradiated with ultraviolet light from the sterilization section 12. In this way, the first power supply member 41 and the second power supply member 42 are supported in an insulated state by the left and right side plates 38, and the first power supply member 41 and the second power supply member 42 are connected to a high-voltage power supply unit 72 (see FIG. 9).

As shown clearly in Figures 4 to 6, the upper and lower sterilization sections 12 each include a reflector 47 formed to cover both the charging section 8 and the dust collection section 9 from above and below, an ultraviolet unit 48a for the charging section provided at a position on the reflector 47 corresponding to the charging section 8 in a direction perpendicular to the air flow direction, and an ultraviolet unit 48b for the dust collection section 9 provided at a position on the reflector 47 corresponding to the dust collection section 9 in a direction perpendicular to the air flow direction.

The reflector 47 is made of aluminum (or stainless steel, or may have a mirror-finished surface) and is formed in a flat plate shape, and is disposed opposite the openings 13, 39 for ultraviolet irradiation in the charger 8 and dust collector 9. The reflector 47 is disposed between the polluted air area and the clean air area, and is provided with a communication section 50 that can communicate between the polluted air area and the clean air area. The communication section 50 is formed of a plate-shaped member made of aluminum (or stainless steel, or may have a mirror-finished surface, but is made of the same material as the reflector 47), and is detachably attached to the reflector 47 via screws 51 or the like so that a maintenance opening (not shown) formed in the reflector 47 can be opened and closed.

Each ultraviolet unit 48a, 48b is composed of an ultraviolet lamp 52a, 52b that is provided on the inner surface of the reflector 47 and irradiates ultraviolet light, and an ultraviolet power supply unit 53a, 53b that is provided on the outer surface of the reflector 47 and supplies power to the ultraviolet lamps 52a, 52b. The ultraviolet units 48a, 48b of this embodiment use a method of lighting using a glow lamp (ignition tube), which is generally widely used because it is simple and inexpensive.

The ultraviolet lamps 52a and 52b may be of the LED type, but the lamp type is preferable because it allows for a larger output. The LED type has a smaller radiation amount than the lamp type, but has the advantage of a longer lifespan, so in order to compensate for the radiation amount, multiple ultraviolet LEDs may be arranged opposite the charging unit 8 and the dust collection unit 9. In particular, two or more rows of ultraviolet LEDs may be arranged opposite each other on the top and bottom of the dust collection unit 9. In the case of ultraviolet LEDs, it is also possible to increase the linearity of the ultraviolet rays by using a lens shape, etc. Also, to increase safety, an electromagnetic lock function (not shown) may be installed to prevent the front door (not shown) of the main body 2 from opening when the ultraviolet lamps 52a and 52b are irradiating.

The ultraviolet lamps 52a, 52b are arranged vertically so as to face the support substrate 17 and the electrode plates (dust collecting electrode plate 35, high voltage electrode plate 36) according to the arrangement of the ultraviolet units 48a, 48b, and are arranged in a direction perpendicular to the arrangement of the support substrate 17 and the electrode plates 35, 36. If the ultraviolet lamps 52a, 52b are arranged in a direction along the arrangement of the support substrate 17 and the electrode plates 35, 36, specifically, parallel to the support substrate 17 and the electrode plates 35, 36, they need to be arranged away from the support substrate 17 and the electrode plates 35, 36 so as not to be in the shadow of the adjacent support substrate 17 and the electrode plates 35, 36. However, since the ultraviolet lamp has spatial attenuation, if it is arranged away from the support substrate 17 and the electrode plates 35, 36, even if the ultraviolet lamps are arranged vertically, there is a risk that the required dose will not be obtained. In contrast, when the ultraviolet lamps 52a, 52b are arranged vertically in a direction perpendicular to the arrangement of the support substrate 17 and the electrode plates 35, 36 as in this embodiment, even if the ultraviolet lamps are arranged near the support substrate 17 and the electrode plates 35, 36, the ultraviolet rays irradiated from the upper and lower ultraviolet lamps 52a, 52b are reflected and refracted between the support substrate 17 and the electrode plates 35, 36, respectively, and reach the back of the support substrate 17 and the electrode plates 35, 36, so that the ultraviolet rays can be reliably irradiated within a range of half the length (1/2Y) of the vertical length Y of the support substrate 17 and the electrode plates 35, 36 as shown in Fig. 6. In addition, since the support substrate 17 and the electrode plates 35, 36 are made of aluminum and have excellent light reflection efficiency, the ultraviolet rays can reach every corner of the support substrate 17 and the electrode plates 35, 36, and the collected viruses and bacteria can be inactivated. In addition, the ultraviolet lamps 52a and 52b are positioned outside the area where air circulates, making them less likely to become dirty, allowing for stable irradiation of ultraviolet rays.

The ultraviolet lamps 52a, 52b for the dust collection unit 9 facing the electrode plates 35, 36 are preferably disposed at the midpoint (1/2X) of the horizontal length X (air flow direction) of the electrode plates 35, 36 as shown in FIG. 6. This ensures that the entire electrode plates 35, 36 are irradiated with ultraviolet light.

Furthermore, it is preferable that the ultraviolet lamps 52a, 52b are arranged 20 to 50 mm apart in the vertical direction from the high voltage electrode plate 36 and the dust collecting electrode plate 35. If the distance is closer than 20 mm, there is a risk that ultraviolet rays will not be able to irradiate the entire high voltage electrode plate 36 and the dust collecting electrode plate 35, and if the distance is greater than 50 mm, there is a risk that the amount of ultraviolet rays irradiated will decrease. In addition, the output of the ultraviolet lamps 52a, 52b is preferably 4 to 10 W, and most preferably 8 W, taking into account the length of ultraviolet lamps generally available on the market.

The ultraviolet light irradiated (radiated) from the ultraviolet lamps 52a, 52b is preferably UV-C ultraviolet light with a wavelength (200-280 nm) that is highly effective in suppressing viruses and bacteria. This is because UV-C ultraviolet light is highly effective in suppressing the proliferation function of viruses and bacteria by acting on the DNA and RNA in the cells of viruses and bacteria. The wavelength of the ultraviolet light irradiated (radiated) from the ultraviolet lamps 52a, 52b is more preferably 240-260 nm, and most preferably around 253.7 nm. Compared with ultraviolet light of other wavelengths, ultraviolet light with a wavelength in the range of 240-260 nm is more effective in suppressing the proliferation function of viruses and bacteria by acting on the DNA and RNA in the cells of viruses and bacteria. Furthermore, the wavelength of 253.7 nm is more preferably 240-260 nm.
This is because nearby ultraviolet light has the most effective sterilization effect.

In general, the sterilization dose required to sterilize viruses and bacteria is calculated using the following formula.
Sterilization dose (mJ/ ^cm2 ) = Sterilization irradiance (mW/cm2) x irradiation time (sec)

As shown in Figure 8, the sterilization dose required for inactivation is high for rotavirus (including coronavirus).

The germicidal ray irradiance is the irradiance of ultraviolet light on the surface of the electrode plate measured by a measuring device (UV intensity meter), and the irradiation time is set based on the measurement result of the irradiance. Alternatively, an ultraviolet ray irradiation means capable of securing the necessary germicidal ray irradiance by setting the irradiation time in advance may be selected.
For example, if the sterilization dose for a specific virus or bacteria is 24 (mJ/cm ² ) and the irradiation time is 10 minutes (600 sec), the required sterilization radiation illuminance is calculated by the above formula as follows:
Germicidal irradiance (mW/cm ² ) = 24/600 = 0.04 (mW/cm ² )
It is calculated as follows.

The output of the ultraviolet lamps 52a and 52b is fixed at a few watts, but the output may be changed depending on the virus or bacteria to be inactivated. Specifically, as shown in FIG. 8, when comparing the sterilization dose required for inactivating rotavirus with other viruses and bacteria, the dose required for other viruses and bacteria is less than half that of rotavirus, so the output of the ultraviolet lamps 52a and 52b may be made variable in two stages depending on the type of virus or bacteria to be sterilized, or the output of the ultraviolet lamps 52a and 52b may be made variable in two stages depending on the period to be sterilized, such as setting the output to a high dose only in winter (around February to March), when rotavirus is generated, and setting the output to a low dose during other periods.

The ultraviolet power supply units 53a and 53b are provided in the clean air area and are equipped with a glow lamp replacement port 55 and a frequency changeover switch 54. The ultraviolet lamps 52a and 52b are detachably attached to the mounting parts of the ultraviolet power supply units 53a and 53b. The settings for replacing the glow lamp and switching the frequency (50 Hz, 60 Hz) using the frequency changeover switch 54 can be changed from the contaminated air area side through the communication part 50. For example, the glow lamp replacement work is performed by removing the charging part 8 and the dust collecting part 9 from the main body 2, and then removing the communication part 50 and performing the work through the maintenance opening of the reflector 47. In other words, the glow lamp replacement work and the frequency switching work can be performed without removing the cover 49 covering the sterilization part 12, so there is no risk of the worker coming into contact with parts unnecessary for the glow lamp replacement work and the frequency switching work when the cover 49 is removed. Therefore, it is possible to prevent inadvertent malfunctions during the above work.

As explained in the above embodiment, the ultraviolet lamps 52a, 52b of the sterilization unit 12 are preferably arranged in a direction perpendicular to the support substrate 17 and the electrode plates 35, 36, respectively, but they do not necessarily have to be arranged in a perpendicular direction and may be arranged in a crossing direction.

The reflector 47 is formed in a flat plate shape behind the ultraviolet lamps 52a, 52b, but instead of this reflector 47, as shown by the dashed line in Figure 6, a reflector 56 formed in an expanding shape (horn shape) gradually expanding from the ultraviolet lamps 52a, 52b toward the ultraviolet irradiation openings 13, 39 of the charging section 8 and the dust collecting section 9 may be provided in accordance with the size of each opening 13, 39.

9, the air purifier 30 of this embodiment is connected to a control unit 60 having a memory 61 and a CPU 62 via an interface 63, and includes a display unit 64, an operation unit 65, a UV irradiation unit 66, a fan rotation detection unit 67, an ozone concentration detection unit 68, a front door opening/closing detection unit 69, a solenoid drive unit 70, a motor drive unit 71, a high voltage power supply unit 72, and the like. The display unit 64 displays the operation state of the air purifier 30, the operation unit 65 has input keys, and the UV irradiation unit 66 irradiates ultraviolet lamps 52a and 52b. The fan rotation detection unit 67 is, for example, an encoder, and detects whether the suction fan 11 is rotating or stopped. The front door opening/closing detection unit 69 is, for example, a limit switch, and detects the opening/closing state of the front door, and functions as a safety device for turning off the high voltage and the operation of the fan motor 74 when the front door is open. The solenoid drive unit 70 drives a shutter 73 that blocks the intake and exhaust paths when the device is not in operation. The motor drive unit 71 controls a fan motor 74. The high-voltage power supply unit 72 includes a high-voltage generation unit 75, a polarity switching unit 76, and a current detection unit 77, and is configured to boost the AC power source with a high-voltage transformer, convert the AC current to DC in the voltage multiplier, and further boost the voltage to generate a high voltage of several kV. The high-voltage power supply unit 72 also functions as an output control unit for controlling the output of the high voltage applied to the charging unit 8 and the dust collecting unit 9.

As shown in Figures 1 to 3, 6, and 7, in the air purifying device 30 according to the embodiment of the present invention having the above-mentioned configuration, air that flows into the main body 2 from the suction port 4 by driving the suction fan 11 is filtered by the prefilter 7 and then flows into the charging section 8.

The air that flows into the charging section 8 passes through the upstream opening 31 of the upstream grounding electrode plate 14, and then passes through the downstream opening 32 of the downstream grounding electrode plate 15. At this time, a high voltage (e.g., -6 kV) supplied from the high voltage power supply unit 72 under constant voltage control is applied to the support substrate 17 and the discharge electrode 18 via the power supply member 29, and as shown in Figure 3, approximately cone-shaped charged areas EA1 and EA2 are formed by corona discharge between the tip of the discharge electrode 18 (brush tip) and the openings 31 and 32.

When the air that has flowed into the charging section 8 passes through the upstream opening 31 of the upstream grounding electrode plate 14 and the downstream opening 32 of the downstream grounding electrode plate 15, particles such as fine dust or mist in the air and minute viruses are charged and collected in the dust collection section 9, and then pass through the ozone decomposition section 10. As a result, the air is filtered to become purified air, and is discharged outside the air purification device 30 from the exhaust port 5.

Next, with reference to Figures 10 to 15, the operation performed by the control unit 60 when the air purifier 30 according to the embodiment of the present invention sterilizes and/or inactivates particles after collecting particles in the air as described above will be described. Here, Figure 10 is a flowchart showing the overall operation of the air purifier 30, Figure 11 is a flowchart showing the operation of the air purifier 30 in the ultraviolet sterilization mode, Figure 12 is a flowchart showing the operation of the air purifier 30 in the ozone sterilization mode, Figure 13 is a flowchart showing the operation of the air purifier 30 in the ozone and ultraviolet sterilization mode, Figure 14 is a flowchart showing the operation of the air purifier 30 in the exhaust mode, and Figure 15 is a time chart showing the operation of the air purifier 30.

It is assumed that the number of bacteria and viruses inside the air purifier 30 increases as the level of pollution increases, so a pre-set sterilization mode is selected according to the level of pollution inside the air purifier 30. In this embodiment, three types of modes are pre-set: an "ultraviolet sterilization mode" that is selected when the level of pollution is low (low dirt), an "ozone sterilization mode" that is selected when the level of pollution is medium, and an "ozone and ultraviolet sterilization mode" that is selected when the level of pollution is high (high dirt).

In this embodiment, the degree of contamination inside the air purifier 30 is determined by the degree of contamination of the charging unit 8 (discharging unit) before the start of sterilization operation after the end of normal operation. Note that normal operation (dust collection operation) refers to an operation in which particles in the air sucked into the inside of the main body by the suction fan are charged and collected by the electric dust collector. When the charging unit 8 becomes dirty, it becomes difficult for current to flow to the charging unit 8, and as a result, the discharge current decreases. Therefore, the current value flowing through the charging unit 8 is detected and the above-mentioned three types of modes are assigned according to two thresholds, a first threshold and a second threshold, which are set in advance. Specifically, when the detected current value of the charging unit 8 exceeds the first threshold (e.g., several mA), the "ultraviolet sterilization mode" is selected, when it is equal to or less than the first threshold and exceeds the second threshold (e.g., several hundred μA), the "ozone sterilization mode" is selected, and when it is equal to or less than the second threshold, the "ozone and ultraviolet sterilization mode" is selected.

First, we will explain the overall operation flow with reference to Figure 10.

In step 1 (S1), it is determined whether the front door open/close detection unit 69 has detected that the front door of the air purifier 30 is closed. If it is determined that the front door is closed, the process proceeds to steps 2 to 4 (S2 to S4), and if it is not determined that the front door is closed, the operation of step 1 is repeated.

Then, in each of steps 2 to 4 (S2 to S4), the rotation of the suction fan 11 is stopped (see S2), the application of high voltage to the electrostatic precipitator 19 is stopped (see S3), and the shutters 73 of the suction port 4 and the exhaust port 5 are closed (see S4).

In the next step 5 (S5), it is determined whether the detected current value of the charging unit 8 is equal to or less than the first threshold value. If it is determined that the detected current value of the charging unit 8 is equal to or less than the first threshold value, the process proceeds to the next step 6 (S6). If it is determined that the current value is not equal to or less than the first threshold value (i.e., exceeds the first threshold value), the "ultraviolet sterilization mode" is selected, and the operation in the ultraviolet sterilization mode described below is performed, as shown in FIG. 11.

In the next step 6 (S6), it is determined whether the detected current value of the charging unit 8 is equal to or less than the second threshold value. If it is determined that the detected current value of the charging unit 8 is not equal to or less than the second threshold value (i.e., exceeds the second threshold value), the "ozone sterilization mode" is selected, and operation in the ozone sterilization mode described below is performed, as shown in FIG. 12. On the other hand, if it is determined in step 6 (S6) that the detected current value of the charging unit 8 is equal to or less than the second threshold value, the "ozone/ultraviolet sterilization mode" is selected, and operation in the ozone/ultraviolet sterilization mode described below is performed, as shown in FIG. 13.

In the above embodiment, the degree of contamination of the charging section 8 of the electrostatic precipitator 19 is used to determine the degree of contamination inside the air purifier 30, but this is not limited to the above. In this embodiment, constant voltage control is used, so the current varies depending on the degree of contamination, but if the voltage varies depending on the degree of contamination (constant current control), the voltage variation may be used.

In addition, a sensor whose output changes depending on the level of contamination (for example, the output decreases when the level of contamination is high) may be installed inside the air purification device 30, and the level of contamination inside the air purification device 30 may be determined based on the output result of the sensor during the most recent normal operation before the sterilization process. Specifically, the level of contamination inside the air purification device 30 may be determined by comparing the number of particles in the air measured by a dust sensor with a threshold value, or by comparing the dose of ultraviolet light measured by an ultraviolet sensor installed at the ultraviolet light irradiation position with a threshold value.

Next, the operation flow in UV sterilization mode will be explained with reference to Figures 11 and 15.

As shown in step 11 (S11) of FIG. 11, when the ultraviolet lamps 52a and 52b start irradiating the charge unit 8 and the dust collector 9 with ultraviolet rays, in step 12 (S12), it is determined whether a preset time has elapsed since the start of ultraviolet irradiation. Then, the ultraviolet lamps 52a and 52b irradiate the charge unit 8 and the dust collector 9 with ultraviolet rays until the preset time has elapsed, and if it is determined that the preset time has elapsed, the process proceeds to the next steps 13 and 14 (S13 and S14).

In the next steps 13 and 14 (S13 and S14), the irradiation of ultraviolet light to the charging unit 8 and dust collection unit 9 is stopped (see S13), the shutters 73 of the intake port 4 and exhaust port 5 are closed (see S14), and the ultraviolet sterilization mode is terminated.

Next, the operation flow in ozone sterilization mode will be explained with reference to Figures 12 and 15.

As shown in step 21 (S21) of FIG. 12, the polarity of the high voltage applied to the electrostatic precipitator 19 is switched from negative (-) to positive (+), and as shown in step 22 (S22), a high voltage (e.g., +10 kV) is applied to the electrostatic precipitator 19 to generate a streamer discharge.

Then, in step 23 (S23), it is determined whether a preset time has elapsed since the start of application of high voltage. Then, high voltage is applied to the electric dust collector 19 until the preset time has elapsed. If it is determined that the preset time has elapsed, in the next step 24 (S24), application of high voltage to the electric dust collector 19 is stopped, and operation in the ozone sterilization mode is terminated.

Next, the operation flow in ozone/UV sterilization mode will be explained with reference to Figures 13 and 15.

As shown in step 31 (S31) of FIG. 13, the polarity of the high voltage applied to the electrostatic precipitator 19 is switched from negative (-) to positive (+), and as shown in step 32 (S32), a high voltage (e.g., +10 kV) is applied to the electrostatic precipitator 19 to generate a streamer discharge. Also, as shown in step 33 (S33), irradiation of the charging unit 8 and the precipitator 9 with ultraviolet rays is started from the ultraviolet lamps 52a and 52b.

Then, in step 34 (S34), it is determined whether a preset time has elapsed since the start of the application of high voltage and the start of irradiation of ultraviolet light. Then, until the preset time has elapsed, high voltage is applied to the electrostatic precipitator 19, and ultraviolet light is irradiated from the ultraviolet lamps 52a and 52b to the charger 8 and precipitator 9. If it is determined that the preset time has elapsed, the process proceeds to the next steps 35 and 36 (S35 and S36).

In steps 35 and 36 (S35 and S36), the application of high voltage to the electrostatic precipitator 19 is stopped (see S35), and the irradiation of ultraviolet light to the charger 8 and precipitator 9 is stopped (see S36), and the ozone/ultraviolet sterilization mode is terminated.

As shown in FIG. 15, in the ozone/ultraviolet sterilization mode, the set time for irradiating ultraviolet rays may be extended and the amount of ultraviolet rays irradiated may be increased compared to other modes.

As described above, when the ozone sterilization mode or the ozone/UV sterilization mode ends, the exhaust mode is then performed.

As shown in FIG. 14, in this exhaust mode, in step 41 (S41), the shutters 73 of the intake port 4 and exhaust port 5 are opened, and then, as shown in step 42 (S42), the suction fan 11 starts operating at a slower speed than the normal operating speed.

Then, in step 43 (S43), it is determined whether a preset time has elapsed since the start of operation of the suction fan 11, and the suction fan 11 is operated at a low speed until the preset time has elapsed. Then, when it is determined that the preset time has elapsed, as shown in step 44 (S44), the operation of the suction fan 11 is stopped and the exhaust mode ends. In the exhaust mode, ozone is exhausted outside the device little by little, improving the ozone removal effect of the ozone decomposition unit 10 and suppressing a sudden increase in the ozone concentration outside the device.

In the above-mentioned exhaust mode, the suction fan 11 is controlled to operate at a lower speed when the sterilization operation is completed than the suction fan 11 during normal operation (dust collection operation). However, an ozone concentration detection unit 68 (see FIG. 9) that detects the ozone concentration may be provided inside the air purifier 30, and the suction fan 11 may be configured to control the suction fan 11 rotation speed according to the ozone concentration detected by the ozone concentration detection unit 68. For example, when the ozone concentration is high, the suction fan 11 may be operated at a lower speed, and the suction fan 11 rotation speed may be increased as the ozone concentration decreases. The suction fan 11 may continue to operate at a low speed until the ozone concentration becomes zero or almost zero. Furthermore, the suction fan 11 rotation speed may be linked to the opening operation of the sealing means 6 (shutter 73).

As described above, according to the air purifying device 30 of the embodiment of the present invention, the sterilizing power of ozone from the electrostatic precipitator 19 and the sterilizing power of ultraviolet light from the sterilizing unit 12 are used in combination, so that the sterilizing effects of ozone and ultraviolet light complement each other. In other words, even if there is an area that cannot be reached by ultraviolet light, ozone can be filled over a wide area to sterilize, and ultraviolet light can be concentrated in a narrow area to reliably sterilize the irradiated area, so that viruses, bacteria, and dust in the air can be inactivated reliably in a synergistic manner.

As described above, during normal operation, when particles in the air are charged and collected, a high voltage (e.g., -6 kV) is applied to the electrostatic precipitator 19 under constant voltage control. However, in the ozone sterilization mode or ozone/ultraviolet sterilization mode, the polarity is changed to increase the voltage (e.g., +10 kV) when streamer discharge is performed, so that more ozone is generated and the sterilization effect is improved.

The above description of the embodiments of the present invention describes preferred embodiments of the air purifying device according to the present invention, and therefore may include various technically preferable limitations, but the technical scope of the present invention is not limited to these aspects unless there is a specific description that limits the present invention. In other words, the components in the above-mentioned embodiments of the present invention can be appropriately replaced with existing components, etc., and various variations, including combinations with other existing components, are possible, and the above description of the embodiments of the present invention does not limit the content of the invention described in the claims.

The technology of the present invention is expected to be suitably used in air purifiers for home and commercial use.

Reference Signs 4: Inlet port 5: Exhaust port 6: Sealing means 8: Charger 9: Dust collector 10: Ozone decomposition section 11: Suction fan 12: Sterilizer 17: Support substrate 18: Discharge electrode 19: Electric dust collector 13: Opening for ultraviolet irradiation (charger)
26 Insulator (charged part)
28 Insulator (charged part)
30 Electric dust collector 35 Dust collection electrode plate 36 High voltage electrode plate 39 Opening for ultraviolet irradiation (dust collection section)
45 First insulator (dust collection part)
46 Second insulator (dust collection section)
47 Reflector 50 Communication section 52a Ultraviolet lamp (charging section)
52b Ultraviolet lamp (dust collection section)
53a Ultraviolet power supply unit (charging unit)
53b Ultraviolet power supply unit (dust collection unit)
60 Control unit 68 Ozone concentration detection unit

Claims (12)

An air purifying device that electrostatically charges and collects particles in the air, and then sterilizes and/or inactivates them,
a charging unit that applies a high voltage to charge the particles;
a dust collecting unit that collects the particles charged by the charging unit;
A sterilization unit that irradiates ultraviolet light to sterilize and/or inactivate particles;
Equipped with
The sterilization unit is disposed opposite the charging unit and the dust collection unit ,
The sterilization unit includes a reflector that reflects the irradiated ultraviolet light toward the charging unit and the dust collecting unit,
The reflector includes a communication section that can open and close and allows communication between the contaminated air area and the clean air area, and an ultraviolet power supply section that supplies power to the sterilization section is provided in the clean air area.
An air purifying device characterized by: The air purifier according to claim 1, wherein the sterilizing unit is disposed in a position close to the charging unit and the dust collecting unit and away from the air flow passage. In the charging section, a plurality of support substrates for supporting a discharge electrode to which a high voltage is applied are provided in parallel along the air flow direction,
The dust collecting section includes a high-voltage electrode plate to which a high voltage is applied, and a dust collecting electrode plate that collects particles repelled by the high voltage applied to the high-voltage electrode plate, the high-voltage electrode plate being provided in parallel along the air flow direction,
3. The air purifying device according to claim 1, wherein the sterilizing unit includes an ultraviolet lamp, and the ultraviolet lamp is disposed in a direction intersecting the supporting substrate, the high-voltage electrode plate, and the dust collecting electrode plate. The air purifier according to claim 3, wherein the support substrate, the high voltage electrode plate, and the dust collecting electrode plate are made of aluminum. An air purifier according to any one of claims 1 to 4, wherein the charging unit and the dust collecting unit have openings for ultraviolet irradiation at locations facing the sterilizing unit. 6. The air purifying device according to claim 5, wherein the reflecting plate is made of aluminum and is disposed opposite the opening for irradiating ultraviolet light. 7. The air purifying device according to claim 6, wherein the reflector is disposed between the polluted air region and the clean air region , and an ultraviolet power supply unit that supplies power to an ultraviolet lamp provided in the sterilizing unit is provided in the clean air region. An air purifier according to any one of claims 1 to 7, wherein the sterilizing unit irradiates ultraviolet light after the operation of the device is stopped. An air purifier according to any one of claims 1 to 8, in which the dose of ultraviolet light irradiated from the sterilizing unit is set to 25 mJ/cm2 or more at the center of the irradiated surface. An air purifier according to any one of claims 1 to 9, wherein the insulators provided in the charging section and the dust collecting section are provided in locations that are not irradiated with ultraviolet light from the sterilizing section. In the dust collecting section, a high-voltage electrode plate to which a high voltage of 4 to 8 kV is applied and a dust collecting electrode plate for collecting particles repelled by the high voltage applied to the high-voltage electrode plate are arranged in parallel with each other at an interval of 5 to 10 mm,
The sterilization unit includes an ultraviolet lamp, and the ultraviolet lamp is disposed 20 to 50 mm away from the high voltage electrode plate and the dust collecting electrode plate in a direction perpendicular to each of the high voltage electrode plate and the dust collecting electrode plate,
The wavelength of the ultraviolet light irradiated from the ultraviolet lamp is 240 to 260 nm,
The air purifying device according to any one of claims 1 to 10, wherein the output of the ultraviolet lamp is 4 to 10 W. The device includes a suction port, the charging unit, the dust collecting unit, the sterilizing unit, an exhaust port, and a suction fan.
The air purifying device according to any one of claims 1 to 11, wherein the charging unit charges dust, fine particles, and viruses contained in the air sucked in from the suction port by the suction fan, and then the dust collecting unit collects the dust, and clean air is discharged from the exhaust port.

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