air purifier

Abstract

This invention provides an air purifier that purifies gas by bringing a photocatalytic liquid and a gas into contact using the pores of a porous material, while irradiating the photocatalyst with light. [Solution] This air purifier comprises a hollow cylindrical body that partially contacts a photocatalytic liquid, and a light source positioned inside and / or outside the cylindrical body, wherein the cylindrical body is rotatable, is made of a porous material, and is configured such that when gas passes through the cylindrical body, the photocatalytic liquid held in the pores of the cylindrical body comes into contact with the gas.

Description

Technical Field

[0001] The present invention relates to an air purifier.

Background Art

[0002] The following Patent Document 1 describes a liquid atomization device provided with a gas chamber formed within a porous member. The porous member is cylindrical, with its upper part exposed from the liquid surface and its lower part arranged to be immersed in the liquid. While rotating the cylindrical porous member, pressurized air is supplied into the gas chamber, and the liquid infiltrated into the porous member is dissipated by the gas to atomize the liquid. The device according to Patent Document 1 is said to have a simpler structure compared to a liquid atomization device using an ultrasonic generator.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The device of Patent Document 1 merely describes a device for generating mist from an arbitrary liquid.

[0005] In a conventional air purifier using a photocatalyst, a liquid containing the photocatalyst is stored in a container, and light is irradiated onto a corresponding volume of the liquid stored in the container to excite the photocatalyst. Then, the excited photocatalyst is brought into contact with the gas to decompose viruses and odor substances contained in the air. If the efficiency of bringing the photocatalyst into contact with the gas is poor, there is a problem that the efficiency of purifying the gas decreases.

[0006] An object of the present invention is to provide an air purifier that purifies a gas by bringing a photocatalyst liquid into contact with the gas while irradiating the photocatalyst with light by utilizing the pores of a porous body. [Means for solving the problem]

[0007] The above problem is solved by an air purifier having a hollow cylindrical body that partially contacts a photocatalytic liquid, and a light source positioned inside and / or outside the cylindrical body, wherein the cylindrical body is rotatable, and the cylindrical body is made of a porous material, and the air purifier is configured such that when gas passes through the cylindrical body, the photocatalytic liquid held in the pores of the cylindrical body comes into contact with the gas. In this air purifier, it is possible to efficiently excite the photocatalyst held in the porous material by irradiating it with light from the light source.

[0008] In the above-described air purifier, it is preferable to have light sources placed both inside and outside the cylindrical body. By placing light sources both inside and outside the cylindrical body, it becomes possible to excite the photocatalyst more efficiently.

[0009] In the air purifier described above, the thickness of the cylindrical body can be 5 to 15 mm. The photocatalytic liquid held inside the cylindrical body is also more easily excited by the light source.

[0010] The above-described air purifier is further equipped with an air intake, and it is preferable that the air intake is provided with a cylindrical portion that supplies the gas taken in from the air intake into the inside of the cylindrical body. By providing the cylindrical portion, the taken-in gas is guided into the inside of the cylindrical body, and the photocatalytic liquid is less likely to flow out from the air intake when the air purifier tips over.

[0011] In the above-described air purifier, a porous material can be placed on the inner wall of the air purifier. When the air purifier tips over, the photocatalytic liquid is absorbed by the inner wall made of the porous material, making it difficult for the photocatalytic liquid to flow out of the air purifier.

[0012] In the above-described air purifier, the photocatalytic liquid may be a liquid containing one or more of the following: tungsten oxide, titanium oxide, zinc oxide, strontium titanate, zinc sulfide, cadmium sulfide, and rose bengal.

[0013] The above air purifier can be further equipped with a deodorizing unit, which removes odors contained in the gas that has passed through the cylindrical body. If there are odor components that cannot be deodorized by the photocatalytic liquid, they can be deodorized by the deodorizing unit. [Effects of the Invention]

[0014] According to the present invention, an air purifier can be provided that purifies a gas by bringing a photocatalytic liquid and a gas into contact using the pores of a porous material, while irradiating the photocatalyst with light. [Brief explanation of the drawing]

[0015] [Figure 1] This is a cross-sectional view showing the internal structure of an air purifier. [Figure 2] This is a cross-sectional view of section AA' in Figure 1. [Figure 3] Figure 2 is an enlarged view of the cylindrical body shown. [Figure 4] This is a cross-sectional view showing the internal structure of an air purifier according to another embodiment. [Figure 5] This is a cross-sectional view showing another example of a sealing material. [Figure 6] This is a cross-sectional view showing another example of a sealing material. [Modes for carrying out the invention]

[0016] The following describes one embodiment of the air purifier of the present invention. The embodiments shown below are merely limited examples of the embodiments of the present invention, and the technical scope of the present invention is not limited to the examples shown.

[0017] [First Embodiment] Figures 1 to 3 show an example of the air purifier of the present invention. The air purifier 1 of this embodiment has a hollow cylindrical body 11 that partially contacts the photocatalyst liquid 51, and a light source 12 disposed inside and outside the cylindrical body 11. The cylindrical body 11 is configured to be rotatable and is made of a porous body. When gas passes through the cylindrical body 11, the photocatalyst liquid 51 held in the pores of the cylindrical body 11 is configured to contact the gas. The arrow in Fig. 3 indicates the rotation direction of the cylindrical body 11. In the example of Fig. 3, the cylindrical body 11 rotates clockwise, but it may be configured to rotate counterclockwise.

[0018] The air purifier 1 has left and right side walls 13 and front and rear side walls 14. On the left and right side walls 13 and the front and rear side walls 14, the plate-like porous body 141 is disposed on the inner surface of the side walls. When referring to the left and right, front, and rear side walls, Fig. 1 is the reference. The thickness of the porous body 141 disposed on the inner surface of the side walls is not particularly limited, but for example, it can be set to 15 to 20 mm. By disposing the porous body 141 inside the side walls, when the air purifier 1 falls, the porous body can absorb the photocatalyst liquid, preventing the photocatalyst liquid from flowing out of the air purifier.

[0019] The cylindrical body 11 and the light source 12 are disposed in the space inside the side walls. The bottom of the inner space surrounded by the side walls is a liquid storage tank 15. The photocatalyst liquid 51 is stored inside the storage tank 15. As shown in Fig. 1, the bottom part of the space surrounded by the porous body 141 may be used as the storage tank, or a container made of a metal material, a synthetic resin material, etc. may be further provided inside the porous body, and the container may be used as the storage tank.

[0020] The cylindrical body 11 is made of a porous material and is fixed in a rotatable state to the space inside the air cleaner 1. In this embodiment, a support portion 32 for supporting the cylindrical body 11 is fixed to the side wall, and the cylindrical body 11 is fixed to the plate-shaped support portion 32. A plurality of rod-shaped bodies 34 having a circular cross-section are arranged between the support portion 32 and the cylindrical body 11, and the rod-shaped bodies 34 support the cylindrical body 11 in a rotatable state like rollers. The rod-shaped body 34 is supported by a pedestal 33 having a concave hole for supporting the rod-shaped body 34 in a rotatable state. The pedestal 33 is arranged on the support portion 32. The cylindrical body 11 may be fixed to the side wall or the like in a rotatable state by a cylindrical roller bearing. In this case, for example, the cylindrical body 11 is fixed to the inner sleeve of the cylindrical roller bearing, and the outer sleeve of the cylindrical roller bearing is fixed to the side wall or the like, or a support portion of an arbitrary shape is fixed to the outer sleeve. The shape of the support portion is not limited to a plate shape and can be an appropriate shape.

[0021] As shown in FIG. 1, a spur gear 31 is fixed to the outer peripheral portion of the cylindrical body 11. The spur gear can be made of a material such as metal or synthetic resin. The spur gear 31 and the cylindrical body 11 can be fixed by means such as an adhesive in a state where the cylindrical body 11 is fitted into a circular hole provided in the spur gear 31.

[0022] The cylindrical body is rotated by the power of a power source 41 including an electric motor and a reduction mechanism. A spur gear 42 is provided at the tip of the shaft of the power source 41, and the spur gear 31 and the spur gear 42 mesh with each other. The power of the power source 41 is transmitted to the cylindrical body 11 through the shaft, the spur gear 31, and the spur gear 42. As the reduction mechanism, a known gear box can be used.

[0023] A light source 121 is placed inside the cylindrical body 11. The light source 121 is fixed to the side wall 13 via a fixing part 16. In the air purifier 1 of this embodiment, the fixing part 16 also serves to secure a power supply for the light source and is a power socket to which the power terminals on the light source side can be connected. The light source 121 can be any light that emits light of a wavelength suitable for exciting the photocatalyst. In the air purifier 1 of this embodiment, a light-emitting diode (LED) is used as the light source 121.

[0024] A light source 12 can also be provided on the outside of the cylindrical body 11. In the air purifier 1 of this embodiment, a light source 122 that irradiates light onto one side of the cylindrical body 11 and a light source 123 that irradiates light onto the other side of the cylindrical body are arranged above the cylindrical body 11. By arranging the light sources above the cylindrical body 11, it is possible to prevent the light sources from being contaminated by the photocatalytic liquid, which could lead to a decrease in the brightness of the light sources or even cause the light sources to malfunction.

[0025] The light source may be located either inside or outside the cylindrical body. The number of light sources is not particularly limited and can be changed as appropriate. In the example in Figure 1, a light source 121 containing a total of six light-emitting diodes is placed inside the cylindrical body 11. In the drawing, multiple light sources are shown as cylindrical blocks. Outside the cylinder, as shown in Figure 2, a light source 122 containing two light-emitting diodes is placed on the upper right side of the cylindrical body 11, and another light source 122 containing two light-emitting diodes is placed on the upper left side of the cylindrical body 11. In the drawing, multiple light sources are shown as rectangular blocks. Although not shown in the illustration, an additional light source 122 containing a light-emitting diode may be placed between the right-side light source and the left-side light source.

[0026] By placing light sources both inside and outside the cylindrical body 11, the photocatalytic liquid 51 can be excited from both the inside and outside of the cylindrical body 11. For example, when increasing the thickness of the cylindrical body 11 to increase the amount of photocatalytic liquid drawn into the cylindrical body 11, placing light sources both inside and outside the cylindrical body 11 and irradiating the photocatalyst with light from both sides allows for efficient excitation of the photocatalyst. For example, when the thickness of the cylindrical body is 5 to 15 mm, it is preferable to provide light sources both inside and outside the cylindrical body.

[0027] The porous material constituting the cylindrical body and the porous material fixed to the side wall shall have pores, i.e., micropores, that can hold the photocatalytic liquid. As the porous material, for example, nonwoven fabric, foamed synthetic resin, or metal porous material may be used. If the porous material lacks rigidity, a mesh having sufficient rigidity to prevent the porous material from easily deforming and an opening that does not obstruct the passage of the photocatalytic liquid and light may be used as a reinforcing part, and the porous material may be housed within the reinforcing part.

[0028] Porous metals, also known as porous metals, are metal materials that have a sponge-like structure with internal pores. These pores can hold photocatalysts. The materials that make up the porous metal are not particularly limited, but examples include nickel, nickel-chromium alloys, titanium, silver, and aluminum.

[0029] For the porous body, it is preferable to use a metal porous body in terms of rigidity and durability. Metal porous bodies are also excellent in terms of maintaining a certain shape, i.e., shape retention, and are therefore preferred as components of the porous body 141 placed on the inside of the side wall and as components of the cylindrical body 11.

[0030] An air intake port 21, consisting of a through-hole, is provided in the side wall. In the example shown in Figure 1, the air intake port 21 is located above the liquid surface of the photocatalytic liquid 51 and on the side of the cylindrical body 11. An air filter 22 is attached to the air intake port 21 for the purpose of removing dust and debris contained in the air. As the air filter 22, a known filter made of a material such as nonwoven fabric can be used.

[0031] The intake port 21 is provided with a cylindrical portion 23 that supplies the gas taken in from the intake port 21 into the interior of the cylindrical body 11. The cylindrical portion 23 protrudes laterally from the opening of the intake port 21 and guides the gas taken in from the intake port 21 into the interior of the cylindrical body 11. Since the cylindrical portion 23 protrudes from the side wall of the air purifier 1, it can prevent the photocatalytic liquid 51 from flowing out of the intake port when the air purifier 1 tips over, thereby preventing the photocatalytic liquid from flowing out of the air purifier 1 from the intake port 21. The shape of the cylindrical portion 23 may be cylindrical, or it may be a tapered shape with a circular cross-section that narrows downstream in the direction of gas flow, as in the example in Figure 1, or it may be a hollow rectangular prism. It is preferable that the cross-sectional shape of the cylindrical portion 23 be circular, as this makes it less likely for the gas flow to be disturbed.

[0032] By providing the cylindrical body 11 at the air intake port 21, the photocatalytic liquid stored at the bottom of the air purifier is less likely to flow out of the air intake port 21 when the air purifier 1 tips over. As shown in Figure 1, the tip of the cylindrical body 11 is located inside the cylindrical body 11 and has a tapered shape, which further prevents the photocatalytic liquid from leaking out of the air intake port 21.

[0033] A deodorizing section 61 is provided above the cylindrical section 23, that is, downstream in the direction of gas flow. The deodorizing section 61 is provided for the purpose of removing odor components that could not be decomposed by the photocatalytic reaction using the photocatalytic liquid. For example, a filter supported with a porous material such as activated carbon or zeolite can be used as the deodorizing section. The deodorizing section 61 is provided so that the gas taken into the air purifier from the intake port 21 cannot be discharged outside the air purifier unless it passes through the deodorizing section 61.

[0034] Downstream of the deodorizing unit 61, a blower 71 and an exhaust port 72 are provided. The gas treated with the photocatalytic liquid and passed through the deodorizing unit 61 is discharged outside the air purifier through the exhaust port 72 by the blower 71. A cylindrical exhaust pipe may be connected to the exhaust port 72. In the example shown in Figure 1, the exhaust port 72 and the blower 71 are located in the space at the upper end of the air purifier.

[0035] As a blower, known blowers such as turbo fans, centrifugal fans, and propeller fans can be used.

[0036] As the photocatalytic liquid, a liquid containing a substance that is excited by light irradiation and carries out a chemical reaction that contributes to air purification such as deodorization or sterilization can be used. As the photocatalyst, one or more photocatalysts from among tungsten oxide, titanium oxide, zinc oxide, strontium titanate, zinc sulfide, cadmium sulfide, and rose bengal can be suitably used.

[0037] The aforementioned photocatalyst can be used as a photocatalytic solution by adding it to a suitable solvent. For example, water can be suitably used as the solvent. The concentration of the photocatalyst can be adjusted as appropriate.

[0038] The shape of the cylindrical body is not limited to a circular cross-section; for example, it may have a polygonal cross-section. However, a circular cross-section makes it easier to irradiate the photocatalyst supported on the porous body with light from a light source evenly. Furthermore, a circular cross-section stabilizes the rotation of the cylindrical body when it contains the photocatalytic liquid.

[0039] [Second Embodiment] Figure 4 shows another embodiment of the air purifier of the present invention. The configurations common to the air purifier 1 according to the first embodiment described above will not be explained.

[0040] In this embodiment, the air purifier 1b is equipped with measures to prevent gas leakage at both ends of the cylindrical body 11. As shown in Figure 4, annular sealing material 111 is provided at both ends of the cylindrical body 11. The sealing material 111 is fixed to the cylindrical body 11 by fixing annular reinforcing parts 112 to both ends of the cylindrical body 11 and holding the sealing material 111 in the space formed between the annular reinforcing parts 112 and both ends of the cylindrical body 11.

[0041] The reinforcing portion 112 is a member with a U-shaped cross-section, having a plate-shaped first portion disposed on the outside of the cylindrical body 11 and extending in the axial direction of the cylindrical body, a plate-shaped second portion disposed on the inside of the cylindrical body 11 and extending in the axial direction of the cylindrical body, and a plate-shaped third portion connecting the first portion and the second portion and covering the end of the cylindrical body 11.

[0042] The intake port 21 that supplies external gas into the cylindrical body 11 is provided with a flange-shaped first receiving portion 113 that protrudes radially outward from the cylindrical portion 23. The first receiving portion 113 is circular and plate-shaped, and is provided between the base end and the tip end of the cylindrical portion 23, protruding radially from the cylindrical portion 23. The second portion of the reinforcing portion 112, which is fixed to one end of the cylindrical body 11, is positioned to contact the first receiving portion 113.

[0043] An annular second receiving portion 114 is provided on the other end of the cylindrical body 11, which is fixed to the side wall. The second receiving portion 114 has a plate-shaped first portion fixed to the side wall, a plate-shaped second portion connecting the first portion to a third portion which will be described later, a plate-shaped third portion which serves as the receiving surface for the reinforcing portion 112, and a plate-shaped fourth portion which protrudes from the third portion in the extending direction of the cylindrical body 11. The second portion of the reinforcing portion 112 fixed to the other end of the cylindrical body 11 is positioned to contact the third portion of the second receiving portion 113.

[0044] A cover 115 is provided on the other end of the cylindrical body 11 to close the opening at the end of the cylindrical body 11. The outer edge of the cover 115 is in contact with a reinforcing part 112 fixed to the other end of the cylindrical body 11. The inner edge of the cover 115 is fixed to the light source fixing part of the cylindrical body 11 in a rotatable manner via a bearing part 116. A ball bearing or a roller bearing can be used as the bearing part.

[0045] A support portion 263 is provided at one end of the cylindrical body 11 to support the cylindrical body 11 in a rotatable state. The support portion 263 consists of a rotatable roller, a rotation axis of the roller, and a support portion for the rotation axis. The roller is positioned to be in contact with a reinforcing portion 112 fixed to one end of the cylindrical body 11. The support portion for the rotation axis is made of an L-shaped plate and is fixed to the bottom of the liquid storage tank 62, which will be described later.

[0046] When the cylindrical body 11 is rotated by the power source 41, the reinforcing portion 112 at one end of the cylindrical body 11 rotates so as to slide against the first receiving portion 113, and the reinforcing portion 112 at the other end of the cylindrical body 11 rotates so as to slide against the second receiving portion 114. The space between the reinforcing portion 112 and the first receiving portion 113 is moistened with photocatalytic liquid, providing lubrication and sealing.

[0047] One end of the light source 121, which is positioned inside the cylindrical body 11, is fixed to the cylindrical part 23 via a fixing device 261. In the example in Figure 4, an L-shaped stay is used as the fixing device 261, but other known fixing devices may be used. The other end of the light source 121 is fixed by connecting the fixing part 16 and the light source 121 with a shaft portion 262. The shaft portion 262 is fixed so as to be removable by inserting it into the fixing part 16, and the light source 121 can be easily removed by pulling out the shaft portion 262 from the fixing part 16.

[0048] An annular retaining portion 231 is provided at the base edge of the intake port 21. The retaining portion 231 is a U-shaped portion in cross-section, having a plate-shaped first portion extending along the direction of extension of the side wall, a plate-shaped third portion extending along the direction of extension of the side wall and provided at a distance from the first portion, and a plate-shaped second portion connecting the first and second portions. The air filter 22 can be easily attached to and detached by fitting the air filter 22 into the retaining portion 231.

[0049] The storage tank 62 has a box-like shape with an open top. The storage tank 62 is made of synthetic resin or metal material and is positioned on the bottom of an inner space surrounded by side walls. Since the storage tank 62 is positioned on the bottom and the cylindrical body 11 is supported only by a support part 263 at one end and a fixed part at the other end by a bearing part 116, the cylindrical body 11 and the storage tank 62 can be easily removed from the air purifier for cleaning and maintenance by removing the air filter 22, the cylindrical body 23 and the light source 121.

[0050] The holding portion 231 is integrally formed with the cylindrical portion 23. After removing the fixing device 261 that secures the light source 121, the holding portion 231 and the cylindrical portion 23 can be removed together by pulling the light source 121 in the axial direction. The light source 121 can be removed by pulling it in the axial direction, thereby pulling the shaft out of the fixing portion. The cylindrical body 11 can be removed by pulling the cylindrical body 11 in the axial direction, thereby detaching the bearing portion 116 from the fixing portion 16.

[0051] The usage method for the air purifiers 1 and 1b described above will now be explained. A photocatalytic liquid suitable for the application is poured into the storage tanks 15 and 62 of the air purifiers 1 and 1b. The liquid level of the catalyst liquid should be such that, for example, the light source is not submerged in the catalyst liquid, but the lower part of the cylindrical body 11 is submerged in the photocatalytic liquid. The power source 41 is activated to rotate the cylindrical body 11 as shown in Figure 3. The photocatalytic liquid is held in the pores of the rotated cylindrical body 11, and the photocatalytic liquid 51 is drawn up above the liquid surface. As shown in Figure 3, any excess photocatalytic liquid that could not be held in the pores will drip down along the cylindrical body 11 or vertically due to gravity, and the liquid will be drained.

[0052] The light source is activated to irradiate the photocatalytic liquid 51 held in the cylindrical body 11 with light, thereby exciting the photocatalyst. When the blower 71 is activated, outside air is taken into the air purifier 1 from the air intake 21 and supplied to the inside of the cylindrical body 11. The gas is held in the cylindrical body 11 and comes into contact with the excited photocatalyst 51, and is purified. In the air purifier 1b, the reinforcing part 112, sealing material 111, lid 115, first receiving part 113, or second receiving part 114 are configured to prevent air taken in from leaking out from the end of the cylindrical body, so that more of the gas taken in passes through the cylindrical body 11 in the thickness direction. As a result, the gas comes into contact with the photocatalyst more easily, and the efficiency of the photocatalytic treatment is increased.

[0053] The gas that has passed through the cylindrical body 11 then passes through the deodorizing unit 61, where auxiliary deodorization is performed. The gas that has passed through the deodorizing unit 61 is discharged outside the air purifier through the exhaust port 72.

[0054] The above-described air purifier can be suitably used for deodorizing facilities that emit strong odors. It can also be suitably used in enclosed spaces to inactivate viruses and other pathogens in the air and deodorize the environment. Examples of facilities that emit strong odors include livestock farms such as pig farms.

[0055] The size of the air purifier can be changed according to the application. Because it employs a structure that prevents the photocatalytic liquid from leaking out in the event of tipping, the dimensions and external shape can be freely selected.

[0056] In the air purifier described above, a cylindrical body is used to pump up the photocatalytic liquid, and light is irradiated from a light source to excite the photocatalytic liquid, bringing the gas into contact with the photocatalytic liquid. Because of this reaction mechanism, the amount of photocatalytic liquid required for the reaction can be reduced. This makes it possible to reduce the operating costs of the air purifier.

[0057] In the air purifier described above, the cylindrical body rests on a part that rotatably supports it. Therefore, the cylindrical body can be easily removed when necessary.

[0058] In the above example, a configuration was shown in which the air intake port 21 and the cylindrical body 23 are located on only one side of the cylindrical body 23. The structure shown in Figure 4 may also be made symmetrical so that the air intake port 21 and the cylindrical body 23 are located on both sides of the cylindrical body 11.

[0059] In the air purifier described above, an example was shown in which an O-ring with a circular cross-section was used as the sealing material. As the sealing material, for example, multiple sheets of annular sealing material 111b with a sheet-like cross-section may be used in layers, as shown in Figure 5. Alternatively, a sealing material called a V-ring 111c, which has a shape in which a plate-like lip protrudes from the end of a block-shaped sealing material, may be used, as shown in Figure 6. In the example shown in Figure 6, an annular sealing material 111d with a sheet-like cross-section is placed between the sealing material 111c and the reinforcing part 112 to further improve airtightness. Note that in Figures 5 and 6, only the upper end of the cylindrical body 11 is shown, and the lower end of the cylindrical body 11 is not shown. The sealing material can be made of a material such as NBR (nitrile rubber) which has excellent wear resistance. [Explanation of Symbols]

[0060] 1. Air purifier 1b Air purifier 11. Cylindrical body 51 Photocatalyst liquid 12 light source 21 Air intake 23 Cylindrical part 61 Deodorizing section

Claims

1. An air purifier having a hollow cylindrical body that is partially in contact with a photocatalytic liquid, and a light source positioned inside and / or outside the cylindrical body, The cylindrical body is configured to be rotatable, The tubular body is made of a porous material, An air purifier configured such that when a gas passes through the cylindrical body, the gas comes into contact with a photocatalytic liquid held in the pores of the cylindrical body.

2. The deodorizing device according to claim 1, wherein a light source is arranged both inside and outside the cylindrical body.

3. The air purifier according to claim 2, wherein the thickness of the cylindrical body is 5 to 15 mm.

4. It also has an air intake, The air purifier according to claim 1 or 2, wherein the air intake is provided with a cylindrical portion that supplies gas taken in from the air intake into the inside of the cylindrical body.

5. An air purifier according to claim 1 or 2, wherein a porous material is arranged on the inner wall.

6. The air purifier according to claim 1 or 2, wherein the photocatalytic liquid is a liquid containing one or more of tungsten oxide, titanium oxide, zinc oxide, strontium titanate, zinc sulfide, cadmium sulfide, and rose bengal.

7. It also has a deodorizing unit, An air purifier according to claim 1 or 2, wherein odors contained in gas that has passed through a cylindrical body are removed in a deodorizing section.

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