JP2019005094A - Small size air cleaner - Google Patents

Abstract

To enhance a purification efficiency of air of a small size air cleaner.SOLUTION: A small size air cleaner comprises: a cylindrical casing having a suction port and an exhaust port; and an air cleaning unit stored in the casing. The air cleaning unit comprises a suction fan for introducing air from the suction port to the casing, a cleaning part provided between the suction fan and the exhaust port, and at least one light emission part for radiating light to the cleaning part, in which the suction fan, the cleaning part and the light emission part are provided along an axial direction of the casing. The cleaning part comprises a plate-shaped filter where air passes, and a masking part provided on a peripheral part of the filter and blocks passage of the air, and the cleaning part is provided to divide a space in the casing along a direction vertical to the axial direction of the casing. The filter comprises a porous plate and a photocatalyst carried on the porous plate, and purifies air which passes the filter by light radiation from the light emission part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a small air cleaning apparatus using a photocatalyst.

  In recent years, there has been an increasing demand for air purifiers including deodorizers in search of a clean environment. As an air cleaning device for the purpose of removing odorous substances and volatile organic compounds (VOC), for example, there are devices that use physical adsorbents, chemical adsorbents, ions, ozone, photocatalysts, and the like. Among them, the one using a photocatalyst is advantageous in terms of cost because the photocatalyst can be used for a long period of time in addition to its high ability to remove odorous substances and VOCs and safety.

  Patent Document 1 proposes an air purification apparatus including a plurality of reaction tubes including a photocatalytic functional film and a light source. Patent Document 2 proposes a photocatalytic reaction device including a reaction layer, which is used for gas reforming of a refrigerator or the like, in which a visible light responsive photocatalyst is attached to a perforated plate.

JP, 2006-101187, A Japanese Patent Laid-Open No. 2006-140806

  However, when a plurality of reaction tubes are provided as in Patent Document 1, it is easy to increase the purification efficiency of air, but the size of the apparatus cannot be avoided. In Patent Document 2, although the structure is simple and it is easy to reduce the size, it is difficult to increase the purification efficiency of air.

One aspect of the present invention is a cylindrical casing having an intake port and an exhaust port;
An air purification unit housed in the casing,
The air purification unit includes:
An intake fan for introducing air into the casing from the intake port;
A clean part disposed between the intake fan and the exhaust port;
And at least one light emitting unit for irradiating the cleaning unit with light,
The intake fan, the cleaning unit, and the light emitting unit are provided along the axial direction of the casing,
The cleaning unit includes a plate-like filter through which air passes, and a masking unit that is disposed at a peripheral portion of the filter and shields the passage of air, and the space in the casing extends in the axial direction of the casing. Arranged to divide along the vertical direction,
The said filter is equipped with a porous board and the photocatalyst carry | supported by the said porous board, and relates to the small air purifier which purifies the air which passes the said filter by the light irradiation from the said light emission part.

  According to the small air cleaning apparatus according to the above aspect of the present invention, the air purification efficiency can be increased despite the small size.

It is a longitudinal section showing a small air cleaner concerning one embodiment of the present invention roughly. It is a schematic top view of the casing of the small air purification apparatus of FIG. It is a schematic perspective view of the cleaning part which has a frame provided with a masking part. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1. It is a graph which shows the time-dependent change of the relative concentration of ammonia at the time of using the air purifying apparatus of Example 1 and Comparative Example 1. It is a graph which shows the time-dependent change of the relative concentration of ammonia at the time of using the air purifying apparatus of Examples 1-3.

  A small air cleaning apparatus according to an embodiment of the present invention includes a cylindrical casing having an intake port and an exhaust port, and an air cleaning unit housed in the casing. The air purification unit includes an intake fan for introducing air into the casing from the intake port, a clean unit disposed between the intake fan and the exhaust port, and at least one light emitting unit for irradiating the clean unit with light And comprising. The intake fan, the cleaning unit, and the light emitting unit are provided along the axial direction of the casing. The cleaning unit includes a plate-like filter through which air passes, and a masking unit that is disposed at the periphery of the filter and shields the passage of air, and the space in the casing is perpendicular to the axial direction of the casing. It arrange | positions so that it may divide along. The filter includes a porous plate and a photocatalyst carried on the porous plate, and purifies air passing through the filter by light irradiation from the light emitting unit.

  In general, in a small air purifier, the volume occupied by a portion including a filter for purifying air cannot be increased so much, so that the air purification efficiency tends to decrease. In order to compensate for the low purification efficiency, air is convected in the apparatus to purify over time. On the other hand, in the above embodiment of the present invention, by providing a masking portion that shields the passage of air at the peripheral portion of the filter, air can be selectively passed through the central portion of the filter that has a large amount of light to be exposed. In addition, it is possible to more reliably purify air by a reaction using a photocatalyst. Therefore, the air purification efficiency can be increased. In addition, by providing an intake fan, a cleaning unit, and a light emitting unit along the axial direction of the cylindrical casing, it is easy to reduce the size of the apparatus, and the intake fan alone can achieve a high processing speed (that is, a short time). The air can be purified. On the other hand, when the masking portion is not provided, air passes through the peripheral portion of the filter, which tends to reduce the amount of light, and thus air in an insufficiently purified state is also discharged. In addition, by passing air through a wide range of filters, the flow velocity becomes slow and the backflow of air also increases. Therefore, when no masking part is provided, the purification efficiency is relatively low.

  The masking part is preferably arranged in the non-exposed part of the clean part. Thereby, it is suppressed that the air of a state with insufficient purification | cleaning passes a clean part. Therefore, high purification efficiency can be obtained more easily. Moreover, the light irradiated from the light emission part can be utilized effectively for purification of air.

  The non-exposed part of the clean part means that the light from the light emitting part does not strike the main surface of the clean part facing the light emitting part, or the light quantity is 10% or less of the light quantity at the center of the clean part. Shall be said to be an area.

  In a preferred embodiment, the air cleaning unit includes a pair of light emitting units. The pair of light emitting units are respectively arranged on the intake fan side and the exhaust port side so as to sandwich the cleaning unit, and irradiates the filter with light from one main surface side and the other main surface side of the filter. Since light irradiation can be performed from both main surface sides of the filter, the utilization rate of the photocatalyst can be improved, and the air purification rate can be further increased. In this case, the masking portion may be provided on at least one main surface side peripheral portion of the two main surfaces of the filter, or may be provided on the peripheral portion on both main surfaces of the filter.

  The cleaning unit preferably includes a frame including a masking unit and a filter accommodated in the frame and is detachably disposed. In this case, the masking part or the filter can be easily attached to the device. Moreover, the cleaning part and the filter can be easily cleaned and replaced.

  It is preferable to arrange a shielding plate for preventing the backflow of air at the peripheral edge of the intake fan. Thereby, it is suppressed that air convects in the casing. Since the decrease in the flow rate of the air passing through the clean part is suppressed, the air purification efficiency can be further increased.

  The cylindrical casing preferably includes a top surface and a bottom surface positioned at both ends in the axial direction, and a side surface connecting the top surface and the bottom surface, an air inlet is formed on the top surface, and an exhaust port is formed on the side surface. Formed and used with the bottom side down. With such a structure, even with the intake fan alone, the air taken into the apparatus passes through the clean part without being blocked and flows smoothly to the exhaust port. Therefore, even with a small device, air can be purified efficiently.

  In a preferred embodiment, the battery is housed below the air cleaning unit in the casing. In this case, movement and carrying are facilitated by incorporating a power source while ensuring a smooth air flow in the air cleaning unit.

  The axial length of the casing is preferably 70 to 170 mm. An apparatus provided with such a casing is small and easy to carry and hang. Therefore, it can be used for various purposes.

  The porous plate of the filter is provided with a communication hole extending three-dimensionally inside, and the thickness of the filter is preferably 7 to 13 mm. In this case, the light from the light emitting part easily reaches the inside of the filter, and the internal photocatalyst can be used effectively.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a longitudinal sectional view schematically showing a small air cleaning apparatus according to an embodiment of the present invention.
The small air cleaning device 1 includes a cylindrical casing 2 and an air cleaning unit 3 accommodated in the casing 2. The casing 2 includes an intake port 21 and an exhaust port 22. What is necessary is just to determine the position of the inlet port 21 and the exhaust port 22 in the casing 2 according to the use of the small air purification apparatus 1, for example. In the illustrated example, the cylindrical casing 2 includes a top surface 23 and a bottom surface 24 located at both ends in the axial direction, and a side surface 25 connecting the top surface 23 and the bottom surface 24. The exhaust port 22 is formed in the side surface 25. And the small air purification apparatus 1 provided with such a casing 2 is mainly used in the state which turned the bottom face 24 down. The air introduced into the air cleaning unit 3 in the casing 2 from the air inlet 21 on the top surface 23 of the casing 2 is purified by the air cleaning unit 3 and discharged from the exhaust port 22 on the side surface 25 of the casing 2.

  The air cleaning unit 3 irradiates the cleaning unit 33 with light, an intake fan 31 for introducing air from the intake port 21 into the casing 2, a cleaning unit 33 disposed between the intake fan 31 and the exhaust port 22, and the cleaning unit 33. And a light emitting unit 34 for performing the above. The intake fan 31, the cleaning unit 33, and the light emitting unit 34 are provided along the axial direction of the casing 2 (more specifically, on the same axis). Thus, by providing the components of the air cleaning unit 3 along the axial direction of the casing 2, it becomes easy to reduce the size, and when air is circulated inside the casing 2 only by the intake fan 31 as in the illustrated example. However, the air can be purified at a high processing speed.

  The cleaning unit 33 includes a plate-shaped filter 331 and a masking unit 332 disposed on the peripheral edge of the filter 331. The cleaning part 33 is arranged so as to divide the space in the casing 2 along a direction perpendicular to the axial direction of the casing 2. That is, the cleaning unit 33 is disposed so as to cross the air flow path formed between the intake port 21 and the exhaust port 22 in a direction perpendicular to the axial direction of the casing 2 at a predetermined position of the casing 2. Is done. The filter 331 includes a porous plate and a photocatalyst supported on the porous plate. Therefore, the air introduced from the air inlet 21 inevitably passes through the clean part 33, and when the air passes through the filter 331, the photocatalyst functions by the action of light emitted from the light emitting part 34. The air is purified.

  The plate-like filter 331 allows air to pass therethrough, while the masking portion 332 arranged at the peripheral edge shields the passage of air. By providing such a masking portion 332, the air introduced into the casing 2 by the intake fan 31 selectively passes through the central portion of the filter 331 having a large amount of light to be exposed. Therefore, the purification efficiency of air can be improved by reaction using a photocatalyst. From the viewpoint of further increasing the air purification efficiency by reducing the air exhausted without being purified, it is preferable that the masking part 332 is disposed in the non-exposed part of the cleaning part 33.

  At least one light emitting unit 34 may be provided, but it is preferable that the light emitting unit 34 is disposed on the intake fan 31 side and the exhaust port 22 side so that the cleaning unit 33 is sandwiched between the pair of light emitting units 34 as illustrated. In the latter case, it is possible to irradiate light from both main surfaces of the cleaning section 33 (that is, the main surface on the intake fan side and the main surface on the exhaust port side), so that the utilization rate of the photocatalyst can be increased, and the air Can be more efficiently purified. The light emitting unit 34 includes a light source 341, and an LED (light emitting diode) is preferably used as the light source 341. By using a long-life LED light source, the apparatus can be operated for a long time. The light emitting unit 34 preferably further includes a substrate 342 that supports the light source 341. However, the light emitting part 34 is formed so that air can pass through.

  In FIG. 1, a shielding plate 35 for preventing the backflow of air in the casing 2 is disposed on the peripheral edge of the intake fan 31. In the cylindrical casing 2, air flows through the central portion (the central portion along the axial direction) from the intake port 21 toward the exhaust port 22, so that backflow of air around the inner wall of the casing 2 is prevented. The plate 35 is provided on the periphery of the intake fan 31, that is, in the vicinity of the intake fan 31, on the inner wall along the length direction of the casing 2 and on the periphery thereof. In the illustrated example, the shielding plate 35 is disposed between the intake fan 31 and the cleaning unit 33. However, the shield plate 35 may be disposed between the intake fan 31 and the intake port 21. A pair of shielding plates 35 may be disposed so as to be sandwiched from the side. In particular, as shown in FIG. 1, it is preferable to arrange a shielding plate 35 between at least the intake fan 31 and the cleaning part 33. Thereby, it is suppressed that the space between the intake fan 31 and the cleaning part 33 is released. Therefore, since the convection of the air in the casing 2 is suppressed, it is possible to further improve the air purification efficiency by suppressing a decrease in the flow rate of the air passing through the cleaning unit 33.

  A space is formed below the air cleaning unit 3 in the casing 2, and the battery 4 is accommodated in this space. In this case, the apparatus can be easily moved and carried by incorporating a power source while ensuring a smooth air flow in the air cleaning unit 3. Further, in this space, a circuit board 26 necessary for the operation of the small air cleaning device 1 is also accommodated. The circuit board 26 can be made compact by being housed along the inner wall of the casing 2.

In addition, the casing 2 is provided with switches S _a and S _b , and these switches can be used to start and stop the operation, perform various settings and switching, and measure the remaining battery level. The casing 2 is further provided with display lamps L ₁ , L ₂ , L ₃ , and L ₄ for indicating timer time, operation mode, battery remaining capacity display, and the like.
Below, each element which comprises a small air cleaner is demonstrated in detail.

(Casing 2)
The casing 2 only needs to be cylindrical, and may be rectangular, cylindrical, elliptical, or the like. The cylindrical casing 2 usually includes a side surface along the axial direction and a pair of end surfaces located at both ends of the side surface. Although the orientation of the small air cleaning device 1 is not limited to the example shown in the drawing, the intake fan 31, the cleaning unit 33, the light emitting unit 34, and the like are arranged along the axial direction of the casing 2 to secure storage space for batteries, circuits, and the like. From this point of view, it is preferable to use the casing 2 in a state where the axial direction of the casing 2 is along the vertical direction. In this case, it is preferable that one end face is the top face, the other end face is the bottom face, and the bottom face is used downward, and the inlet 21 is formed on the top and the exhaust 22 is formed on the side. By using the small air cleaning device 1 in such a state, the air flows smoothly in the casing 2.

  The casing 2 can be formed of, for example, resin. Examples of the resin include polyolefins such as polypropylene, engineering plastics such as polycarbonate, etc., and may be determined according to the application.

  The position, size, and shape of the intake port 21 and the exhaust port 22 are not particularly limited, and may be determined within a range that does not excessively prevent air intake and exhaust. In a preferred embodiment, the position, size, and / or shape of each of the intake port 21 and the exhaust port 22 are determined so that light emitted from the light emitting unit 34 does not leak from the intake port 21 and the exhaust port 22. .

  For example, when the intake fan 31 has a blade portion including a plurality of rotating blades as described later, light easily leaks from a gap between adjacent blades when the blade rotates. Therefore, the position, size and / or shape of the air inlet 21 formed in the top surface 23 is determined so that the top surface 23 of the casing 2 (specifically, the non-opening portion of the top surface 23) covers at least the blade portion. It is preferable to do. In this case, it is possible to prevent light from leaking from the intake port 21 to the outside without hindering intake from the intake port 21.

  FIG. 2 is a schematic top view of the casing 2. FIG. 2 shows a case where the top surface 23 covers a blade portion having a plurality of rotating blades of the intake fan 31. The top surface 23 of the casing 2 is formed with a circular air inlet 21 divided into four fan shapes at the center, and substantially triangular air inlets 21 are formed at the four corners. Between the shaped inlets 21, the top surface 23 remains in a ring shape. Since the ring-shaped portion can cover the blade portion of the intake fan 31, light leakage from the inside of the casing 2 can be suppressed.

  The casing 2 is molded and assembled, for example, in a state of being divided into two along the axial direction, but the casing 2 having the top surface 23 shaped as shown in FIG. 2 has the strength of the circular inlet 21 portion. Since it is difficult to secure, it cannot be simply divided into two. In such a case, the top surface 23 may be asymmetrically divided into two.

  When the exhaust port 22 is formed on the side surface of the casing 2, it is possible to prevent light from leaking from the exhaust port 22 without disturbing the exhaust by shifting the position of the exhaust port 22 from the position of the light emitting unit 34. When the light emitting unit 34 is formed on the downstream side of the cleaning unit 33, the exhaust port 22 is formed in a state shifted to the opposite side of the light emitting unit 34 from the cleaning unit 33 (downstream side of the light emitting unit 34). It is preferable.

  When the apparatus 1 is installed so that the casing 2 has a rectangular tube shape and the axial direction is the vertical direction, the exhaust ports 22 may be formed on all four side surfaces of the casing 2, and may be formed on some side surfaces. It may be formed. For example, an exhaust port 22 is formed on three side surfaces, and when the apparatus 1 is installed, it becomes the back surface, the circuit board 26 is arranged along the inner wall of the casing 2, and an indication indicating the operating state, the remaining battery level, etc. The exhaust port 22 may not be formed on the remaining side surface where the lamp is provided. Further, when the apparatus 1 is placed horizontally so that the axial direction of the rectangular tubular casing 2 is the horizontal direction, the exhaust port 22 is formed on one of the four surfaces along the axial direction. Instead, the exhaust ports 22 may be formed on the remaining three surfaces. The exhaust ports 22 may be formed on the remaining surface without forming the exhaust ports 22 on the bottom surface and the front surface and / or the back surface.

  The area S1 of the air inlet 21 preferably occupies 17% or more of the area of the top surface 23, and more preferably occupies 25% or more. When the area S1 is in such a range, a large amount of air can be taken into the casing 2. Even if it occupies an area larger than this, the influence of the catalyst filter becomes larger than the influence of the opening of the intake port. Even when the device 1 is placed horizontally, the ratio of the area S1 to the area of the surface on which the air inlet 21 is provided may be in the above range.

  The area S2 of the exhaust port 22 is preferably at least 1 time, more preferably 1 to 2 times, the area S1 of the intake port 21. When the area S2 is in such a range, the pressure on the exhaust side in the casing 2 is suppressed from being increased, and the air can be efficiently purified by suppressing the decrease in the intake capacity.

  The area S1 of the air inlet 21 is an area of the air inlet 21 in a plane when the surface of the casing 2 in which the air inlet 21 is formed is viewed from the vertical direction. Similarly, the area S2 of the exhaust port 22 is an area of the exhaust port 22 in a plane when the surface of the casing 2 in which the exhaust port 22 is formed is viewed from the vertical direction. When there are a plurality of intake ports 21, the area S <b> 1 of the intake ports 21 means the total area of the plurality of intake ports 21. Similarly, when there are a plurality of exhaust ports 22, the area S <b> 2 of the exhaust ports 22 means the total area of the plurality of exhaust ports 22.

  The exhaust port 22 may be in a state in which the flow path is inclined from the inside to the outside of the casing 2. For example, the upper and lower side walls of the opening portion of the exhaust port 22 of the casing 2 may be inclined in the same direction so that the air is exhausted obliquely downward or obliquely upward from the exhaust port 22. In such a case, leakage of light from the exhaust port 22 to the outside of the casing 2 can be reduced.

The axial length of the casing 2 is preferably 70 to 170 mm. The apparatus including the casing 2 having such a length is small and can be easily moved, carried, and suspended. As for the size of the casing 2, for example, in the portable type, the axial length of the casing 2 is 130 to 170 mm (preferably 130 to 150 mm), and the length (width) in the direction perpendicular to the axial direction is 30 to 50 mm ( Preferably it is 35-45 mm). In the desktop type, the length of the casing 2 in the axial direction is 70 to 130 mm (preferably 70 to 100 mm), and the length (width) in the direction perpendicular to the axial direction is 60 to 90 mm (preferably 60 to 80 mm). It is preferable that
Although the thickness of the casing 2 can be determined according to the kind of material of the casing 2, it is 0.8-2.5 mm, for example.

  Ribs may be provided in the casing 2 as necessary. The rib is formed, for example, in a state of extending from the inner wall of the casing 2 to the inside of the casing 2. In addition, the rib can be arranged in a shape according to the purpose at a position according to the purpose. The rib may be provided along the axial direction of the casing 2 or may be provided in a direction perpendicular to the axial direction. For example, if ribs are provided around the intake port 21 and the exhaust port 22, light leakage from the inside of the apparatus 1 can be further suppressed. If ribs are provided on the upstream side and / or downstream side of the intake fan 31, or ribs are provided on the upstream side and / or downstream side of the cleaning unit 33, backflow of air in the casing 2 can be suppressed. For example, when a rib is provided at a position sandwiching the intake fan 31 and the cleaning part 33, the intake fan 31 can be mounted in the casing 2 and the cleaning part 33 can be attached and detached using the rib as a guide. Similarly, a rib serving as a guide for mounting the light emitting unit 34 in the casing 2 may be provided. Moreover, you may give the role of a masking part, the role of a shielding board, etc. to a rib. Furthermore, for example, a plurality of ribs may be provided in parallel along the axial direction, and the wiring may be accommodated between adjacent ribs. The casing 2 can be reinforced by providing the ribs.

(Air purification unit 3)
(Intake fan 31)
The intake fan 31 introduces air into the casing 2 from the intake port 21. The intake fan 31 is preferably arranged in the casing 2 so as to face the intake port 21 in order to efficiently introduce air into the casing 2. By arranging the intake fan 31 in this way, outside air can be smoothly taken into the casing 2.

  The intake fan 31 preferably has a blade portion including a plurality of rotating blades. In this case, light leakage from the light emitting unit 34 can be reduced by devising the shape of the intake port 21 as described above while sufficiently securing the air volume of intake and exhaust. As the intake fan 31, for example, a sirocco fan, a turbo fan, a mixed flow fan, a blower fan, or the like may be used. However, a propeller fan is preferable from the viewpoint of low cost and a large air volume of intake and exhaust.

  From the viewpoint of suppressing the vibration of the intake fan 31, a vibration suppression unit may be provided on the intake fan 31 or its periphery. For example, a part of the side surface of the intake fan 31 is fixed to a protrusion provided on the inner wall of the casing 2, and a spring structure as a vibration suppressing part is provided on a part of the side surface (such as the side opposite to the portion fixed to the protrusion). Thus, vibration during operation can be suppressed, and displacement of the intake fan 31 can be suppressed. By suppressing the displacement of the intake fan 31 (particularly, the displacement of the rotating shaft), it is possible to suppress the air from passing through the intake fan 31 and to suppress the excessive increase in the sound of the intake fan 31. .

(Cleaning part 33)
The cleaning unit 33 is disposed between the intake fan 31 and the exhaust port 22. The cleaning unit 33 is arranged so as to divide the space in the casing 2 along a direction perpendicular to the axial direction of the casing 2. Thereby, since the air introduced into the casing 2 from the intake port 21 always passes through the cleaning part 33, the air can be purified efficiently.

  The air cleaning unit 3 may include a plurality of cleaning units 33. The plurality of cleaning parts 33 may be arranged along the axial direction of the casing 2, or may be arranged in the surface direction of the cleaning part 33. When arranging along the axial direction of the casing 2, since it is necessary to arrange | position so that the light from the light emission part 34 may hit, it is preferable to arrange the light emission part 34 and the cleaning part 33 alternately. When arranging in the surface direction of the cleaning part 33, it is preferable to arrange the cleaning parts 33 so that the space in the casing 2 is divided by a plurality of cleaning parts 33 along a direction perpendicular to the axial direction of the casing 2. . In this way, the cleaning part 33 is connected in the surface direction and widened, and the size of the parts other than the casing 2 and the cleaning part 33 of the air cleaning unit 3 is increased to increase the processing speed of air purification with a simple structure. Can do. When arranging the cleaning parts 33 along the axial direction of the casing 2, the number of the cleaning parts 33 is 2-3, for example. When arrange | positioning in the surface direction of the cleaning part 33, the number of the cleaning parts 33 is 2-20 pieces, for example, and 2-9 pieces or 2-4 pieces are preferable.

  The cleaning unit 33 includes a plate-like filter 331 through which air passes, and a masking unit 332 that is arranged at the peripheral edge of the filter 331 and shields the passage of air. The filter 331 includes a porous plate and a photocatalyst carried on the porous plate, and purifies the air passing through the filter 331 by light irradiation from the light emitting unit. By forming the masking part 332, the purification efficiency of air improves.

  In this embodiment, in order to purify air in the small apparatus 1, from the viewpoint of enhancing the contact efficiency between the air and the photocatalyst to increase the purification efficiency, the porous plate constituting the filter 331 circulates air. A plate-like substance having a plurality of holes can be used. As the porous plate, a perforated plate, a honeycomb structure plate, a plate in which fins are connected, and the like can be used. However, it is preferable to use a plate having a communication hole extending three-dimensionally inside. Examples of the porous plate having communication holes that extend three-dimensionally inside include a plate-like body having a porous structure having pores such as sponges. Further, by using such a porous plate, the light from the light emitting section 34 can easily reach the inside of the filter 331, and the purification efficiency can be improved by effectively using the internal photocatalyst.

  The material for the porous plate is not particularly limited, and examples thereof include metals, ceramics, and resins. Among these, ceramics are preferable from the viewpoint of durability against a light source (particularly ultraviolet light). Examples of ceramics include alumina, silica, titania, zirconia, and the like.

  From the viewpoint of supporting a large number of photocatalysts while ensuring appropriate air permeability, the porous plate (or filter 331) has a length of 1 inch (≈25.4 mm) on at least one main surface. It is preferable that ~ 13 cells are formed, and it is more preferable that 8-12 cells are formed.

  The thickness of the filter 331 can be selected from a range of 5 to 20 mm, for example, is preferably 7 to 13 mm, and more preferably 7.5 to 11 mm. Although depending on the porosity of the porous plate, when the thickness of the filter is in such a range, the light from the light emitting portion 34 easily reaches the inside of the filter 331, and the internal photocatalyst can be used effectively, so that the purification efficiency Can be improved.

The photocatalyst supported on the porous plate is not particularly limited. For example, a photocatalyst that is responsive to ultraviolet light and / or visible light is used. From the viewpoint of easily obtaining high purification performance, an ultraviolet light-responsive photocatalyst is preferable. Examples of the photocatalyst include a titanium oxide photocatalyst and a tungsten photocatalyst. However, the photocatalyst is not limited to these, and may be selected according to the application of the small air cleaning device 1.
The photocatalytic porous substrate can be supported by a known procedure.

  The shape of the filter 331 is not particularly limited, and may be, for example, a square disk shape or a disk shape.

  Although the masking part 332 is arrange | positioned at the peripheral part of the cleaning part 33, it is preferable to arrange | position in the non-exposed part. By not allowing the air to pass through the non-exposed portion, it is possible to suppress the air from passing through the cleaning portion 33 without being cleaned, thereby improving the air purification efficiency. Moreover, the light irradiated from the light emission part 34 can be utilized effectively for purification of air.

  The masking part 332 is only required to be arranged at the peripheral part or non-exposed part of the filter 331. For example, the masking part 332 is inserted by fitting the filter 331 into the opening of the frame-shaped masking part 332 having an opening at the center. It may be formed. From the viewpoint of easy manufacture of the filter 331, the masking portion 332 may be formed so as to cover the peripheral edge portion and the non-exposed portion of the filter 331. Specifically, the peripheral portion and the non-exposed portion of the filter 331 may be covered with the masking portion 332 on the main surface of the filter 331 facing the light emitting portion 34.

  The masking portion 332 may be integrated with the inner wall of the casing 2 or may be independent from the casing 2. It is preferable that at least the filter 331 is detachable in the cleaning part 33, and the cleaning part 33 may be detachable from the casing 2. By making the filter 331 and the cleaning part 33 detachable, the filter 331 can be easily cleaned (including washing) and replaced. In a preferred embodiment, the cleaning unit 33 includes a frame including a masking unit 332 and a filter 331 accommodated in the frame, and is disposed so as to be detachable from the casing 2. Moreover, in such a cleaning part 33, it is more preferable that the filter 331 is detachable from the frame. When such a cleaning unit 33 is used, the masking unit 332 or the filter 331 can be easily attached to the device 1. Further, the cleaning unit 33 and the filter 331 can be easily cleaned (including cleaning) and replaced.

  For example, the cleaning unit 33 is preferably detachable from the casing 2 in a pull-out manner. It is preferable that the filter 331 is also detachable from the casing 2 and the frame in a pull-out manner. In these cases, the cleaning part 33 and the filter 331 can be easily attached and detached. For example, a rib as described above can be provided at a position where the cleaning part 33 of the casing 2 is accommodated, and the cleaning part 33 can be detachable in a pull-out manner using the rib as a guide. Further, if the width of the rib is increased, the gap inevitably formed between the side surface of the clean part 33 and the inner wall of the casing 2 can be covered with the rib. Light leakage can be suppressed.

  It is preferable that the frame including the masking portion 332 can be accommodated in a state in which the frame is fitted to the inner wall of the casing 2 in order to suppress the backflow of air. For example, a spring structure may be provided on the frame. In this case, since the spring structure also functions as a vibration suppression unit, vibration of the cleaning unit 33 due to the operation of the intake fan 31 and displacement or chipping of the filter 331, the masking unit 332, the frame, and the like due to vibration can be suppressed. The frame may be formed with a claw portion or a projection portion for fixing to the casing 2, or may be formed with a recess portion into which the claw portion or the projection portion formed on the inner wall of the casing 2 can be fitted. In these cases and when the frame has a spring structure, the cleaning section 33 can be stably installed and the stable performance of the cleaning section 33 can be ensured.

FIG. 3 is a schematic perspective view of a cleaning unit having a frame including a masking unit.
The cleaning unit 33 in the illustrated example includes a frame F including a masking unit 332 and a filter 331 accommodated in the frame and carrying a photocatalyst. Circular openings are formed in the vicinity of the center in the plane direction of the two plate-like masking portions 332 arranged so as to sandwich the filter 331 therebetween. The filter 331 is exposed from the opening. Air passes through the exposed area and is irradiated with light to purify the air. Two masking portions 332 are fixed to or integrated with the frame F, and the frame F can be attached to and detached from the small air purifier in a pull-out manner in a state in which the filter 331 is accommodated. The masking portion 332 may be disposed on at least one main surface side of the two main surfaces of the filter 331, or may be disposed only on one of the main surface sides.

  The material constituting the masking portion 332 is not particularly limited and may be metal or ceramics. However, it is preferable to use a resin from the viewpoint of being relatively flexible and easy to attach the filter 331. Examples of the resin include those described for the casing 2.

(Light Emitting Unit 34)
The air cleaning unit 3 includes a light emitting unit 34 for irradiating the cleaning unit 33 (specifically, the filter 331) with light. The air purification unit 3 should just have at least one light emission part 34, and may have multiple. Further, the pair of light emitting units 34 are arranged on the intake fan 31 side and the exhaust port 22 side of the cleaning unit 33 so as to sandwich the cleaning unit 33, and one main surface side and the other main surface of the filter 331 of the cleaning unit 33. It is preferable to irradiate the filter 331 with light from the surface side. By irradiating from both main surfaces of the filter 331, the photocatalyst inside the filter 331 can be effectively used, and air can be purified efficiently.

  The light emitting unit 34 preferably includes a light source 341 and a substrate 342 that supports the light source 341. A circuit for a light source is usually mounted on the substrate 342. Moreover, the circuit of the whole air purification apparatus 1 may be installed collectively in one place. From the viewpoint of long life, it is preferable to use an LED light source as the light source 341. The wavelength of the light source 341 may be selected from a wavelength range in which the photocatalyst can be activated, and is selected from, for example, a visible light region and / or an ultraviolet light region. If the light source 341 that irradiates ultraviolet rays is used, the air can be directly purified by the ultraviolet rays, and the purification can be performed efficiently even if the contact time with the air is short. For example, the LED light source may be a mounting type or a bullet type.

  The light emitting unit 34 may include at least one light source 341 (specifically, a lamp) such as an LED light source, and may include two or more light sources. From the viewpoint of arranging the light sources 341 as densely as possible, when using a plurality of light sources 341, for example, four light sources 341 are arranged in two rows in a state where they are as close as possible, or six light sources 341 are arranged around one light source 341. It is preferable to arrange the light sources 341 as close to each other as possible so as to be the apex of a regular hexagon. When the light sources 341 are arranged closely, variation in light irradiation to the filter 331 when a plurality of light sources 341 are used can be reduced.

  The substrate 342 extends inward from the inner wall of the casing 2 and preferably has a shape that supports the light source 341 near the center of a cross section perpendicular to the axial direction of the casing 2. By arranging the light source 341 in the vicinity of the center so that the light irradiation surface is substantially parallel to the filter, the filter 331 can be irradiated more uniformly with a large amount of light. However, an air flow path needs to be secured around the substrate 342 so as not to block the air flow.

  The shape of the substrate 342 is not particularly limited as long as the air flow path can be secured while supporting the light source 341 and the circuit for the light source 341. For example, a substrate 342 such as a bar protrudes from the inner wall of the casing 2 to the vicinity of the center in the cross section perpendicular to the axial direction of the casing 2 and the light source 341 is disposed at the tip of the substrate 342 such as a bar. Good. Alternatively, a substrate 342 having an X-shaped or Y-shaped planar shape may be formed in the space of the casing 2, and the light source 341 may be disposed at the intersection of the X-shaped or Y-shaped near the center. A board with an E-shaped (or ω-shaped) planar shape is used to project the E-shaped substrate from the standpoint that it is easy to mount and wire in the casing 2 and not obstruct air flow while ensuring a suitable strength. Of the three rod-shaped portions, the central rod-shaped portion is preferably arranged so as to extend inward from the inner wall of the casing 2. And it is preferable to arrange | position the light source 341 in the front-end | tip part of the center rod-shaped part extended to the center part of the cross section perpendicular | vertical to the axial direction of the casing 2. As shown in FIG. When the E-shaped substrate 342 is used, not only the air flow path can be easily secured, but also the lead wire can be accommodated in two concave portions formed between the three rod-shaped portions protruding from the E shape. Note that the portion of the substrate 342 facing the inner wall of the casing 2 has a shape (for example, a part of a curved surface) that conforms to the shape of the inner wall of the casing 2 so that the substrate 342 can be easily disposed along the inner wall. Good.

  4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 4 shows a light emitting unit 34 including an E-shaped substrate 342. More specifically, a rib R for accommodating the substrate 342 is formed on the inner wall side of the casing 2, and the rib R is fixed to the inner wall of the casing 2. In FIG. 4, the ribs R are formed not only on the front side of the substrate 342 but also on the back side, and the substrate 342 is accommodated between the ribs R. In the illustrated example, the substrate 342 has an E-shaped shape, a rod-like base portion extending along the inner wall of the casing 2 in a cross section perpendicular to the axial direction of the casing 2, and the base portion. Three rod-shaped portions extending to the vicinity of the center in the cross section perpendicular to the axial direction of the casing 2 are provided in a substantially vertical direction. Of the three rod-shaped portions, the two rod-shaped portions at both ends extend along the inner wall of the casing 2 in a cross section perpendicular to the axial direction of the casing 2, and the middle rod-shaped portion extends from the base portion to the casing 2. It extends substantially parallel to the two rod-shaped portions at both ends up to near the center in the cross section perpendicular to the axial direction. And the light source 341 is arrange | positioned at the front-end | tip of the center rod-shaped part.

  As described above, the rib R is basically arranged so as to sandwich the light emitting portion 34, but on one main surface side of the light emitting portion 34 like the light emitting portion 34 on the inlet 21 side in FIG. When the shielding plate 35 is disposed, the shielding plate 35 has the function of the rib R, and therefore the rib R may be disposed only on the other main surface side of the light emitting unit 34. Further, even when the shielding plate 35 is disposed close to the light emitting unit 34, the rib R may be provided so as to sandwich the light emitting unit 34.

  In the E-shaped substrate 342, the width of the two rod-shaped portions at the base portion and both ends extending along the inner wall of the casing 2 is preferably larger than the width of the middle rod-shaped portion. Thereby, it is possible to reduce the backflow of air on the inner wall side of the casing 2. Moreover, it can suppress that the flow of air is interrupted | blocked because the width | variety of a center rod-shaped part is small.

  The axial direction of the casing 2 occupies the cross-sectional area in the casing 2 (specifically, the area surrounded by the inner wall of the casing 2 in the cross section perpendicular to the axial direction) in the portion where the substrate 342 is disposed. The ratio of the projected area of the substrate 342 is, for example, 75% or less (for example, 10 to 75%), preferably 12 to 42%. When the area ratio is in such a range, it is easy to secure the air flow path while securing the strength of the light emitting unit 34.

  It is preferable that the light emitting unit 34 and / or the light source 341 are detachably disposed so that the light emitting unit 34 and / or the light source 341 can be repaired or replaced when they deteriorate. For example, if a rib as described above is formed in the casing 2 and the substrate 342 on which the light source 341 is mounted is disposed using the rib as a guide, the casing 2 can be attached and detached in a pull-out manner.

  The material of the substrate 342 is not particularly limited, and examples thereof include metals and resins. Examples of the resin include those exemplified for the casing 2. Further, if the control circuit is manufactured using the same material as the substrate, the manufacturing process can be reduced, leading to a reduction in manufacturing cost.

  Although it depends on the type and light quantity of the light source 341, the distance between the filter 331 and the light emitting unit 34 is, for example, 5 to 20 mm, and preferably 6 to 13 mm. When the distance between the filter 331 and the light emitting unit 34 is within such a range, the light from the light emitting unit 34 can be applied to the filter 331 more uniformly and without waste.

  Note that the distance between the filter 331 and the light emitting unit 34 refers to the shortest distance between the main surface of the filter 331 facing the light emitting unit 34 and the end of the light emitting unit 34 on the filter 331 side.

  A vibration suppressing unit may be provided in the light emitting unit 34 or in the vicinity thereof. By providing the vibration suppressing unit, it is possible to suppress the light emitting unit 34 from vibrating during the operation of the device 1 (specifically, the intake fan 31). Moreover, the shift | offset | difference and chipping | missing of the light emission part 34 accompanying a vibration can be prevented. A spring structure or the like can be used as the vibration suppressing unit. In this case, vibration of the light emitting unit 34 can be suppressed with a simple structure. For example, when the substrate 342 of the light emitting unit 34 is accommodated in a pull-out manner using two ribs as a guide, a spring structure is provided in a portion accommodated between the two ribs of the substrate 342, and the substrate 342 is fixed between the two ribs. May be. In addition, a part of the side surface of the substrate 342 is fixed to a protrusion provided on the inner wall of the casing 2, and a spring structure as a vibration suppressing part is provided on a part of the side surface (opposite the portion fixed to the protrusion). The inner wall of the casing 2 may be fixed.

  The intake fan 31, the cleaning unit 33, and the light emitting unit 34 are provided along the axial direction of the casing 2. Thereby, the apparatus 1 can be easily miniaturized and the air can be cleaned at a high processing speed. In particular, it is preferable to arrange the intake fan 31, the cleaning unit 33, and the light emitting unit 34 coaxially in the casing 2. In addition, arrange | positioning coaxially means arrange | positioning each member so that the central axis in each surface direction of the intake fan 31, the clean part 33, and the light emission part 34 may become the same (that is, it overlaps). However, the central axis of each member may be slightly deviated. For example, if the deviation of each central axis is within 5 mm, each member is arranged coaxially.

(Other)
The air purification unit 3 may include a dust collection filter as necessary. By providing the dust collecting filter, it is possible to prevent the performance of the cleaning unit 33 from being deteriorated and the parts are damaged due to the dust or dust entering the casing 2. From the viewpoint of suppressing clogging of the cleaning part 33, the dust collection filter is preferably provided at least upstream of the cleaning part 33. For example, the dust collection filter may be provided between the intake port 21 and the intake fan 31, or may be provided on the opposite side of the intake fan 21 from the intake port 21 and upstream of the cleaning unit 33 and the light emitting unit 34. Good. The dust collection filter is provided along the axial direction of the casing 2 together with the intake fan 31 and the like so that the air passing through the casing 2 always passes through the dust collection filter, and passes through the casing 2 in a direction perpendicular to the axial direction. It is arranged to cross.

  Examples of the dust collection filter include known filters such as a metal filter such as stainless steel and brass, a glass fiber filter, and a nonwoven fabric filter. The glass fiber filter and the nonwoven fabric filter may contain a polymer binder. The dust collection filter is, for example, on the inner surface of the top surface 23 of the casing 2, the main surface of the intake fan 31, the rear surface of the light emitting unit 34 (surface opposite to the light source 341), the inner wall of the casing 2, etc. What is necessary is just to fix using an adhesive tape or welding. For example, if a filter containing glass fiber and vinyl chloride resin or a net-like glass fiber coated with vinyl chloride resin is used as a dust collection filter, it can be easily fixed by thermal welding.

  The air cleaning unit 3 may include a light blocking member as necessary. The light blocking member is disposed so as to surround the light source 341 of the light emitting unit 34. When a bullet-type LED light source is used, it is preferable to arrange a light blocking member because the light source 341 has a certain height. As the light blocking member, a foil, a plate-shaped frame, or the like is used. The material of the light blocking member is not particularly limited, and metal or resin is used. As the metal, aluminum or an aluminum alloy is preferable from the viewpoint of weight reduction. When using a metal, it is necessary to arrange so that it may not contact with another electroconductive member. As the resin, a resin that does not easily deteriorate with respect to visible light or ultraviolet light may be used. Examples of the resin include a polycarbonate resin and an acrylic resin.

  The air purification unit 3 may further include an exhaust fan as necessary. The exhaust fan can be selected from those exemplified for the intake fan, and a sirocco fan or a turbo fan is preferably used. The exhaust fan may be disposed at the position of the exhaust port 22 or may be disposed slightly upstream from the exhaust port 22. The exhaust fan is preferably provided along the axial direction of the casing 2 together with the intake fan 31 and the like from the viewpoint of easily reducing the size of the device 1 and improving the air purification capability.

  Apart from the masking portion 332 and the shielding plate 35, a masking member or a shielding plate for preventing the backflow of air may be provided in the casing 2 as necessary. By providing the masking member and the shielding plate, air convection is suppressed and the purification efficiency can be further increased. The masking member and the shielding plate are preferably provided so as to cover the peripheral edge portion of each member constituting the air cleaning unit 3 (that is, the portion on the inner wall side of the casing 2).

  The battery 2 may be accommodated in the casing 2 and the device 1 may be operated by the battery. In this case, the device 1 can be used in various places (or various places) because it can be used even in a place without an external power source and is easy to carry. When the battery 4 is accommodated in the casing 2, from the viewpoint of easily ensuring a smooth air flow in the air purification unit, the air purification unit 3 is located below the air purification unit 3 in the casing 2 (specifically, from the exhaust port 22. It is preferable to accommodate the battery 4 on the lower side (that is, the side opposite to the air inlet 21). As the battery 4, for example, a dry battery or a secondary battery is used. As the dry battery, an alkaline manganese dry battery is preferable, the purchase of the battery is simple, and it can be easily replaced. As the secondary battery, a lithium ion secondary battery, a nickel metal hydride storage battery, and the like are preferable because they are small and light and have a large capacity. In the case of a secondary battery, it is preferable that the secondary battery can be directly charged from an external power source while being accommodated in the casing 2.

  The small air cleaning device 1 may be operated while supplying power from an external power source. Since a large amount of electric power can be supplied, it is easy to increase the power of the small air cleaning device 1. When the device 1 is installed and used, troubles such as battery replacement and charging are reduced.

  Each member constituting the air purification unit 3 and the battery (or power source) can be connected by a known method. A flexible substrate may be used for connection. When the flexible substrate is used, it can be arranged along the inner wall of the casing 2, so that the air in the casing 2 can be smoothly distributed and the casing 2 can be easily downsized.

  The control circuit (ON / OFF of the intake fan, ON / OFF of the light emitting unit, etc.) of each member of the air cleaning unit is preferably combined on one substrate. By arranging them on a single substrate, wiring and the like can be easily arranged and arranged, for example, along the inside of the side surface of the casing, so that the air cleaning unit can be made compact and further miniaturized.

  The small air cleaning device 1 may further include a control unit for controlling the function of each member constituting the air cleaning unit 3. The control unit is accommodated in the casing 2, for example. The control unit may be disposed in the vicinity of the air purification unit 3 or may be disposed in a space in which the battery 4 is accommodated. The control unit can control, for example, the intake amount of the intake fan 31, the emission intensity of the light emitting unit 34, the operating time of the apparatus 1, the exhaust amount of the exhaust fan, and the like. Capability, rechargeable battery operating time, noise level, etc. can be adjusted.

  The control unit includes a control circuit. The control unit is fixed to, for example, a claw portion or a screw hole provided on the inner wall of the casing 2.

The apparatus 1 further performs various settings and switching such as switches (or buttons) for starting and stopping operation and checking the remaining battery level, such as the switches S _a and S _{b in} FIG. It is preferable to provide a switch (or button) for this purpose. With these switches, for example, timer time setting, fan strength setting, operation mode (for example, high power mode, power saving mode, etc.) may be selected. Further, the device 1, for example, as L ₁ ~L ₄ in FIG. 1, the battery remaining amount, setting time of the timer, be provided with a display lamp for indicating the state such as a fan strength (e.g., LED lamps) Good. The switch is formed so as to be pressed from the outside of the casing 2, and the indicator lamp is formed so as to be visible from the outside of the casing 2.

  Although the small air purification apparatus 1 can be used in the installed state, it can also be used in a suspended state. A part for hanging (ring, hook, etc.) may be provided outside the casing 2.

  The air purification unit 3 may further include a sensor that detects the degree of purification of air, the degree of odor, and the like. What is necessary is just to install a sensor in the air flow path of a load rather than the clean part 33 and the light emission part 34. FIG.

  In order to give a scent to the air exhausted from the exhaust port 22, a fragrance may be accommodated in the air flow path downstream of the cleaning unit 33 and the light emitting unit 34 in the casing 2. In this case, the fragrance is preferably contained in the casing 2 so as to be replenished or possible.

[Example]
EXAMPLES Hereinafter, although this invention is demonstrated concretely based on an Example and a comparative example, this invention is not limited to a following example.

Example 1
The purification performance for ammonia was evaluated using the small air purification apparatus 1 shown in FIG. Specifically, the small air purification apparatus 1 was installed in a 12 L sealed container, ammonia was injected as an evaluation gas into a 240 μmol container, and the ammonia concentration in the air discharged from the exhaust port was measured. Then, assuming that the initial ammonia concentration was 100, the change over time in the ammonia concentration after the small air purifier was operated (from the start of light irradiation) was obtained as a relative concentration (%).

In the small air purification apparatus 1, the size of the casing 2 was set to 140 mm × 38 mm × 38 mm. As shown in FIG. 1, the pair of light emitting units 34 are arranged so as to sandwich the cleaning unit 33. As shown in FIG. 4, each light emitting unit 34 has one ultraviolet light mounted LED as a light source 341 arranged on the middle protrusion of the E-shaped substrate 342, and the distance from the filter 331 of the cleaning unit 33. Was 7 mm. A pair of masking parts 332 having an opening with a radius of 10 mm are arranged at the peripheral edge of the filter 331 of the cleaning part 33 so as to sandwich the filter 331 therebetween. As the intake fan 31, an intake fan having an intake speed of about 0.05 m ³ / min was used.

Comparative Example 1
In the small air cleaning device 1 of Example 1, the pair of masking portions 332 were not arranged. Except this, it carried out similarly to Example 1, assembled the air purifying apparatus, and evaluated the purification | cleaning performance with respect to ammonia.

  The results of Example 1 and Comparative Example 1 are shown in FIG. Example 1 is A1, and Comparative Example 1 is B1. As shown in FIG. 5, in Example 1 in which the masking part 332 was arranged, ammonia in the sealed container could be purified in about 70% of the short time of Comparative Example 1 in which the masking part 332 was not installed. This is considered to be due to the fact that by installing the masking section 332, the air can be allowed to pass through a portion of the filter 331 where the photocatalyst is irradiated with light, thereby improving the purification capability.

  In addition, the size of the opening of the masking portion 332 was changed, and the purification ability and the radiation intensity at the end of the opening with respect to the radiation intensity at the center of the opening were measured. As a result, if masking was performed at a portion of 10% or less with respect to the radiant intensity at the center, a more effective effect was seen compared to the case where the masking portion was not installed.

Example 2
In the small air cleaning device 1 of Example 1, the light emitting unit 34 was provided only on the intake port 21 side, and the light emitting unit 34 on the exhaust port 22 side was not provided. Except this, it carried out similarly to Example 1, and assembled the air purification apparatus 1, and evaluated the purification | cleaning performance with respect to ammonia.

Example 3
In the small air cleaning device 1 of Example 1, the light emitting unit 34 was provided only on the exhaust port 22 side, and the light emitting unit 34 on the intake port 21 side was not provided. Except this, it carried out similarly to Example 1, and assembled the air purification apparatus 1, and evaluated the purification | cleaning performance with respect to ammonia.

  The results of Examples 1 to 3 are shown in FIG. Examples 1 to 3 are A1 to A3. From FIG. 6, high ammonia purification performance was also obtained in Examples 2 and 3 in which one light emitting unit 34 was arranged. Regardless of whether the light emitting unit 34 is disposed on the intake port 21 side or the exhaust port 22 side, the air could be purified in substantially the same time.

  In the first embodiment in which the pair of light emitting units 34 are disposed so as to sandwich the cleaning unit 33, the ammonia in the sealed container is purified in substantially half the time compared to the second and third embodiments in which one light emitting unit 34 is disposed. We were able to. From this point, from the viewpoint of improving the air purification capability and purifying in a shorter time, the light emitting unit 34 is disposed in a pair so as to sandwich the cleaning unit 33 between both main surfaces of the cleaning unit 33. It is preferable to do.

  The small air purification apparatus according to the present embodiment has a high air purification function while being small, and can be purified at a high purification rate, so that it can be used in various places depending on applications. Small air purifiers can be installed in various places in buildings such as indoors, entrances, shoe boxes, toilets, closets, around pets and trash cans, put directly in bags and shoes, and with clothes. It can also be used for hanging.

1: Small air cleaning device 2: Casing, 21: Inlet port, 22: Exhaust port, 23: Top surface, 24: Bottom surface, 25: Side surface 3: Air cleaning unit, 31: Intake fan, 33: Cleaning unit, 331: Filter, 332: Masking part, 34: Light emitting part, 341: Light source, 342: Substrate, 35: Shielding plate 4: Battery, 5: Circuit board, F: Frame, R: Rib, S _a , S _b : Switch, L ₁ , L ₂ , L ₃ , L ₄ : Display lamp

Claims (10)

A cylindrical casing with an inlet and an outlet,
An air purification unit housed in the casing,
The air purification unit includes:
An intake fan for introducing air into the casing from the intake port;
A clean part disposed between the intake fan and the exhaust port;
And at least one light emitting unit for irradiating the cleaning unit with light,
The intake fan, the cleaning unit, and the light emitting unit are provided along the axial direction of the casing,
The cleaning unit includes a plate-like filter through which air passes, and a masking unit that is disposed at a peripheral portion of the filter and shields the passage of air, and the space in the casing extends in the axial direction of the casing. Arranged to divide along the vertical direction,
The filter includes a porous plate and a photocatalyst supported on the porous plate, and purifies air passing through the filter by light irradiation from the light emitting unit.   The said masking part is a small air cleaning apparatus of Claim 1 arrange | positioned at the non-exposed part of the said cleaning part. The light emitting unit includes at least one LED light source and a substrate that supports the LED light source,
The small air cleaning apparatus according to claim 1 or 2, wherein the substrate extends inward from an inner wall of the casing, and an air flow path is secured around the substrate. The air cleaning unit includes a pair of light emitting units as the light emitting unit,
The pair of light emitting portions are respectively arranged on the intake fan side and the exhaust port side so as to sandwich the clean portion, and from one main surface side and the other main surface side of the filter to the filter The small air cleaning apparatus of any one of Claims 1-3 which irradiates light.   The said cleaning | cleaning part is provided with the frame provided with the said masking part, and the said filter accommodated in the said frame, and is arrange | positioned so that attachment or detachment is possible with respect to the said casing. The small air purifier of description.   The small air cleaning apparatus of any one of Claims 1-5 by which the shielding board for preventing the backflow of air is arrange | positioned at the peripheral part of the said intake fan. The cylindrical casing includes a top surface and a bottom surface located at both ends in the axial direction, and a side surface connecting the top surface and the bottom surface,
The air inlet is formed on the top surface,
The exhaust port is formed on the side surface,
The small air cleaning apparatus of any one of Claims 1-6 used in the state which turned down the said bottom face.   The small air purification apparatus of Claim 7 with which a battery is accommodated under the said air purification unit in the said casing. The porous plate includes a communication hole that extends three-dimensionally inside,
The small air purifier according to any one of claims 1 to 8, wherein the filter has a thickness of 7 to 13 mm.   The small-sized air cleaning apparatus of any one of Claims 1-9 whose length of the axial direction of the said casing is 70-170 mm.

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