air purifier

Abstract

To provide an air cleaner in which heat transfer from a light source to a heat sink is improved.SOLUTION: An air cleaner comprises: an approximately L-shaped support member having a bottom part and side parts; a substrate disposed on the bottom part; a light source capable of emitting ultraviolet light, disposed on the substrate; a heat sink having radiation fins disposed on the side parts; approximately L-shaped heat pipes at least portions of which are housed in recesses formed on the support member; and a cover which covers at least a portion of the heat sink. The bottom part of the support member has a first surface and a second surface located on the opposite side of the first surface. The substrate is disposed on the first surface side. The side parts of the support member has a third surface connected to the first surface and a fourth surface located on the opposite side of the third surface. The heat sink is disposed on the third surface side. The recesses are formed on the second surface side and the fourth surface side.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to an air cleaning device. [Background technology]

[0002] Patent Document 1 discloses an air purifying device equipped with a UV light source and plate-like fins. A flow path through which forced air flows is formed between the plate-like fins, and heat transferred to the plate-like fins is dissipated. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-48683 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the device described in Patent Document 1, there is still room for improvement in heat transfer from the light source to the plate-like fins, that is, from the light source to the heat sink. [Means for solving the problem]

[0005] The air purifying device disclosed in the embodiment comprises a substantially L-shaped support member having a bottom and sides, a substrate arranged on the bottom, a light source capable of emitting ultraviolet light arranged on the substrate, a heat sink having heat dissipation fins arranged on the sides, a substantially L-shaped heat pipe at least a portion of which is accommodated in a recess formed in the support member, and a cover covering at least a portion of the heat sink, wherein the bottom of the support member has a first surface and a second surface located opposite the first surface, the substrate is arranged on the first surface side, the side of the support member has a third surface connected to the first surface and a fourth surface located opposite the third surface, the heat sink is arranged on the third surface side, and the recesses are formed on the second surface side and the fourth surface side.

[0006] In at least one of one or more inventions disclosed in the embodiments, it is possible to provide an air purifying device in which heat transfer from a light source to a heat sink is improved. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of an air purifying device according to an embodiment. [Figure 2] FIG. 2 is a perspective view of the rear side corresponding to FIG. [Figure 3] FIG. 3 is a perspective view of a light source unit included in the air purifying device according to the embodiment. [Figure 4] FIG. 4 is a perspective view of the rear side corresponding to FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along a plane parallel to the XZ plane of FIG. [Figure 6] FIG. 6 is a perspective view showing another example of an air purifying device according to an embodiment. [Figure 7] FIG. 7 is a perspective view of the rear surface side corresponding to FIG. [Figure 8] FIG. 8 is a diagram showing the distribution of light emitted from the light source of the air purifying device according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] An air purifying device 100 showing one example of an embodiment of the present invention will be described below with reference to Figures 1 to 5. Note that the drawings referred to in the following description are schematic illustrations of this embodiment, and the scale, spacing, and positional relationships of each component may be exaggerated, or some components may not be shown. Furthermore, in the following description, the same names and symbols generally indicate the same or similar components, and detailed descriptions will be omitted as appropriate.

[0009] For ease of understanding, the following description will use an XYZ Cartesian coordinate system to explain the arrangement and configuration of each part. The X-axis, Y-axis, and Z-axis are mutually orthogonal. In each diagram, the direction of the arrow in the direction of the X-axis is referred to as the "+X direction," and the opposite direction is referred to as the "-X direction." Furthermore, the direction of the arrow in the direction of the Y-axis is referred to as the "+Y direction," and the opposite direction is referred to as the "-Y direction." Furthermore, the direction of the arrow in the direction of the Z-axis is referred to as the "+Z direction," and the opposite direction is referred to as the "-Z direction." The +Z direction is the upward direction, and the -Z direction is the downward direction, but these directions are unrelated to the direction of gravity.

[0010] Additionally, the view from the +Z direction is referred to as a "top view," the view from the +X direction as a "front view," and the view from the +Y direction as a "side view." In this specification or claims, expressions such as up and down, left and right, front and back, front and back, front and back, and the like merely describe the relationship of relative positions, orientations, directions, and the like, and do not necessarily correspond to the relationship during use.

[0011] An example of an air purifying device according to this embodiment will be described below. The air purifying device will be described as an air purifying device that is attached to an air outlet of an air conditioner in a vehicle and sterilizes the air inside the vehicle.

[0012] Fig. 1 is a perspective view of an air purifying device 100 according to an embodiment, and Fig. 2 is a perspective view of the back side corresponding to Fig. 1. As shown in Figs. 1 and 2, the air purifying device 100 includes a light source unit 20 and a cover 10.

[0013] The air purifying device 100 irradiates the gas passing through the inside of the air purifying device with light emitted from the light source unit 20.

[0014] First, each component will be described.

[0015] [cover] The cover 10 is formed in a box shape so that a first opening 11 is formed on the front side and a second opening 12 is formed on the back side. The material of the cover 10 is preferably a light-resistant material, such as Al, SUS, or Cu. From the viewpoints of UV resistance and high reflectivity to ultraviolet light, Al is preferred.

[0016] The cover 10 has an attachment portion 13 extending in the -X direction on the back side (opposite side when viewed from the front) of the air purifying device 100. The attachment portion 13 can be used, for example, when attaching the air purifying device to some member, such as the louvers of an automobile air conditioner.

[0017] [First opening] 1, the air purifying device 100 has a first opening 11 on the front side. The first opening 11 can also be said to be a gap formed when the cover 10 and the light source unit 20 are joined together. The first opening 11 is provided in the upper part of the air purifying device 100, and is open in the YZ plane.

[0018] [Second opening] 2, the air purifying device 100 has a second opening 12 on the back side. The second opening 12 can also be said to be a gap formed when the cover 10 and the light source unit 20 are joined together. The second opening 12 is provided in the lower part of the air purifying device 100, and is open in the YZ plane.

[0019] <Light source unit> Fig. 3 is a perspective view of the light source unit 20, and Fig. 4 is a perspective view of the back side corresponding to Fig. 3. As shown in Fig. 3 and Fig. 4, the light source unit 20 includes a light source 21, a substrate 22, a heat pipe 23, a heat sink 24, and a support member 30.

[0020] [light source] The light source 21 is capable of emitting ultraviolet light. The emission peak wavelength of the ultraviolet light emitted by the light source 21 is, for example, not less than 250 nm and not more than 410 nm, and more preferably not less than 250 nm and not more than 290 nm. However, the emission peak wavelength of the ultraviolet light emitted by the light source 21 is not limited to this wavelength range. The light source 21 includes a light-emitting element. For example, an LED (Light Emitting Diode) or an LD (Laser Diode) can be used as the light-emitting element.

[0021] For example, the light emitting device may include a light emitting device including an active layer made of a GaN-based material, such as GaN, InGaN, and AlGaN.

[0022] [substrate] The substrate 22 is, for example, a wiring substrate having an insulating layer and wiring electrically connected to the light source 21. In this embodiment, the shape of the substrate 22 is generally flat. The substrate 22 has an upper surface and a lower surface, which are generally flat. However, the shape of the substrate is not limited to the above. For example, the substrate may have an uneven surface. The substrate 22 is provided with two through holes for screw fastening. The through holes penetrate the substrate 22 in the Z direction.

[0023] The substrate 22 is, for example, a metal substrate having an insulating layer provided on the surface of a metal plate. Examples of the metal material include Al and Cu. Al is preferable from the viewpoints of weight reduction and heat dissipation. The thermal conductivity of the metal plate of the substrate 22 is, for example, 150 W / mK to 200 W / mK, and the thermal conductivity of the insulating layer is, for example, 1 W / mK to 10 W / mK.

[0024] [Heat pipe] The heat pipe 23 is a member that functions as a thermal conductor. The heat pipe 23 transports heat by phase changes such as evaporation and condensation of the liquid sealed in the container. In this embodiment, a cylindrical heat pipe is used, but a prismatic heat pipe 23 may also be used.

[0025] The material of the container of the heat pipe 23 can be, for example, Cu, Al, SUS, etc., with Cu being preferred from the viewpoints of thermal conductivity and ease of bending. The surface of the container may be plated, with Ni, Sn, etc. being usable as the plating material. The liquid sealed in the heat pipe 23 can be, for example, water, chlorofluorocarbon, methanol, etc., with water being preferred from the viewpoint of being able to reduce vapor pressure within the operating temperature range (for example, 10°C to 100°C). The heat pipe 23 is vacuum-sealed to prevent deterioration.

[0026] The thermal conductivity of the heat pipe 23 is, for example, 2,000 W / mk or more and 100,000 W / mk or less. When the heat pipe 23 is cylindrical, the diameter of the pipe is, for example, 3 mm to 10 mm. When the heat pipe 23 is prismatic, the length of one side of the rectangular cross section in the short direction of the pipe is, for example, 3 mm to 10 mm.

[0027] The heat pipes 23 are arranged along the support member 30, which will be described later, and therefore have a substantially L-shaped shape in the XZ plane. The shape of the heat pipes 23 is not limited to this and can be changed according to the shape of the support member 30. In other words, the bending angle and bending position of the heat pipes 23 may be changed as appropriate.

[0028] [heat sink] The heat sink 24 is a member that functions as a thermal conductor, similar to the heat pipe 23. The heat sink 24 has a base plate 25 and a plurality of heat dissipation fins 26. The base plate 25 and the heat dissipation fins 26 are made of the same material, which is a metal material with good thermal conductivity.

[0029] The base plate 25 is a flat plate arranged parallel to the YZ plane, and a plurality of heat dissipation fins 26 arranged parallel to the XZ plane are connected to the surface on the -X direction side. The base plate 25 has four through holes for screw fastening. The through holes penetrate the base plate 25 in the X direction. The heat dissipation fins 26 are flat plates thinner than the base plate 25 and are arranged at intervals in the Y direction. Three sides are surrounded by adjacent heat dissipation fins 26 and the surface of the base plate 25, thereby forming groove-like flow paths extending in the Z direction. The distance between adjacent heat dissipation fins 26 is, for example, 4 mm or more and 10 mm or less.

[0030] The heat sink 24 can be made of a material such as Al or Cu, with Al being preferred from the standpoint of heat dissipation and weight reduction, as it has high heat dissipation properties and a low specific gravity. Furthermore, it is preferable that the surface of the heat sink 24 be able to reflect and suppress absorption of light irradiated from the light source 21. Therefore, it is preferable that the surface of the heat sink 24 have a reflectivity of 90% or more for the peak wavelength of light irradiated from the light source 21. For example, Al, which has a high reflectivity for ultraviolet light, is preferred. Furthermore, it is preferable that the thickness of the heat dissipation fins 26 is thin, for example, between 0.5 mm and 2 mm, so that light can easily enter the flow path.

[0031] The thermal resistance of the heat sink 24 is, for example, 0.01° C. / W or more and 10° C. / W or less.

[0032] [Supporting member] The support member 30 is a substantially L-shaped member having a bottom portion 31 and a side portion 32. The material of the support member 30 is, for example, Al, Cu, etc. From the viewpoint of heat dissipation and weight reduction, Al, which has high heat dissipation properties and a small specific gravity, is preferable.

[0033] The bottom portion 31 and the side portion 32 of the support member 30 may be integrally formed from the same member, or may be formed by joining separate members.

[0034] The bottom 31 of the support member 30 has a first surface 34 and a second surface 35 located opposite the first surface 34. The side 32 of the support member 30 has a third surface 36 connected to the first surface 34 and a fourth surface 37 located opposite the third surface 36.

[0035] The bottom portion 31 and the side portions 32 are each generally flat. The first surface 34 and the second surface 35 are disposed on the XY plane and are parallel to each other. The third surface 36 and the fourth surface 37 are disposed on the YZ plane and are parallel to each other. The thickness (Z direction) of the bottom portion 31 is, for example, 2 mm or more and 5 mm or less. The thickness (X direction) of the side portions 32 is, for example, 2 mm or more and 5 mm or less.

[0036] In this embodiment, the support member 30 has a generally L-shape with the bottom portion 31 and the side portion 32 forming an angle of approximately 90°, but is not limited to this. For example, the angle formed between the bottom portion 31 and the side portion 32 may be between 60° and 120°.

[0037] Groove-shaped recesses 33 are formed on the second surface 35 side and the fourth surface 37 side of the support member 30. The recesses 33 formed on the second surface 35 side and the recesses 33 formed on the fourth surface 37 side are connected and can accommodate the above-mentioned L-shaped heat pipes 23. The depth of the recesses is, for example, 50% to 80% of the thickness of the bottom portion 31 and the side portion 32.

[0038] The bottom 31 of the support member 30 is provided with two through holes for screw fastening. The through holes penetrate the bottom 31 in the Z direction. The side 32 is provided with four through holes for screw fastening. The through holes penetrate the side 32 in the X direction.

[0039] Next, the air purifying device 100 will be described with reference to FIGS.

[0040] <Air purifier> The air purifying device 100 includes a light source unit 20 and a cover 10, and the cover 10 covers the back side of the light source unit 20. At least a portion of the heat sink 24 is covered by the cover 10. The front side of the light source unit 20 is exposed to the outside of the cover 10. The cover 10 and the light source unit 20 are joined by fitting.

[0041] A substrate 22 is disposed on the first surface 34 side, which is on the bottom 31, of the support member 30 of the light source unit 20. The support member 30 and the substrate 22 are fastened together with screws at two locations using screw holes formed in the bottom 31 of the support member 30 and the substrate 22.

[0042] The heat sink 24 is disposed on the third surface 36 side of the side portion 32 of the support member 30. The support member 30 and the heat sink 24 are fastened together with screws at four locations using screw holes formed in the side portion 32 of the support member 30 and the base plate 25 of the heat sink 24.

[0043] A plurality of light sources 21 are arranged on the substrate 22 along the Y direction (first direction). The light sources 21 are typically LEDs, and external electrodes of the LEDs and wiring on the substrate 22 are electrically and mechanically joined by a conductive joining member such as solder. The number of light sources 21 is, for example, 6 to 12, but is not limited to this. As shown in FIGS. 2 and 4, nine LEDs are arranged in a row in the air purifying device 100. The arrangement of the plurality of light sources 21 is not limited to one row, and may be, for example, two rows, or may be arranged in a zigzag pattern extending along the Y direction.

[0044] The flow paths formed by the heat sink 24 and extending along the Z direction (second direction) intersect with the Y direction. In other words, the direction in which the light sources 21 are arranged intersects with the direction in which the flow paths formed by the heat dissipation fins 26 extend.

[0045] The multiple light sources 21 are arranged on an extension of the flow path formed by the heat sink 24. "Arranged on an extension of the flow path" means that the center of the light source 21 in the Y direction substantially coincides with the center of the flow path in the Y direction. In other words, the light source 21 is arranged between adjacent heat dissipation fins 26 in the Y direction. The advantages of arranging the light source 21 on an extension of the flow path formed by the heat sink 24 will be described later.

[0046] As described above, the flow path is formed as a groove surrounded by the base plate 25 and the adjacent heat dissipation fins 26, but by positioning the surface of the cover 10 so that it is perpendicular to the plate surface of the flat heat dissipation fins 26, the flow path can be surrounded by four surfaces.

[0047] The heat pipe 23 is housed in a recess 33 formed in the support member 30. In this embodiment, the entire heat pipe 23 is housed within the recess so as not to protrude from the second surface 35 of the bottom portion 31 or the fourth surface 37 of the side portion 32. However, a portion of the heat pipe 23 may protrude from at least one of the second surface 35 and the fourth surface 37.

[0048] 3 to 5, the upper end (upper end in the Z direction) of the heat pipe 23 is located at approximately the same position as the upper part (upper end in the Z direction) of the base plate 25. On the other hand, the lower end (end in the X direction) of the heat pipe 23 protrudes from the end face of the substrate 22 in the −X direction.

[0049] 5 is a cross-sectional view of the air purifier 100 taken along a plane parallel to the XZ plane in FIG. 2. As described above, the heat pipes 23 are housed in the recesses 33 formed in the bottom 31 and side 32 of the support member 30. This allows the heat generated when the light source 21 emits light to be efficiently dissipated to the heat sink 24. More specifically, the heat from the light source 21 is transferred from the substrate 22 to the bottom 31 of the support member 30, then through the heat pipes 23 and to the heat sink 24 via the side 32 of the support member 30. This improves heat transfer from the light source 21 to the heat sink 24.

[0050] In the air purifying device 100, light emitted from the light source 21 is irradiated along the Z direction toward the heat sink 24. In FIG. 5, the light emission direction L1 is indicated by an arrow. The flow path is also the portion through which the light from the light source 21 passes. Therefore, the heat sink 24 not only dissipates heat from the light source 21, but also functions as a reflector that reflects the light from the light source 21. It is preferable that the four surfaces surrounding the flow path can suppress absorption of the light irradiated from the light source 21 and can reflect it. For example, it is preferable that the four surfaces have a reflectivity of 90% or more for the peak wavelength of the light irradiated from the light source 21. By surrounding the four surfaces with highly reflective surfaces, it is possible to guide the light to the top of the heat dissipation fins 26.

[0051] The air purifying device 100 is used, for example, by attaching the mounting part 13 to the air outlet of an automobile air conditioner. A second opening 12 is provided on the back side of the air purifying device 100 where the mounting part 13 is provided. Arrows in FIG. 5 indicate the flow of gas W1. Gas entering through the second opening 12 passes through a flow path formed by the heat dissipation fins 26 of the heat sink 24 and is discharged from the first opening 11. In other words, the first opening 11 can be used as an exhaust port, and the second opening 12 can be used as an intake port.

[0052] The gas (air) flowing through the flow path is irradiated with ultraviolet light emitted from the light source 21, so that bacteria floating in the gas are irradiated with the light and can be sterilized. The air taken into the air purifying device 100 through the second opening 12 is sterilized and discharged from the first opening 11.

[0053] The heat sink 24 is cooled by the gas flowing through the flow path. In this embodiment, the heat sink 24, to which light is irradiated, serves both as a sterilization space whose surface is capable of reflecting light and as a heat dissipation member capable of air-cooling the heat of the light source 21.

[0054] A heat sink is generally placed near a light source to dissipate heat from the light source. However, placing a heat sink too close to the light source increases the size of the device. In this embodiment, as described above, the heat sink 24 functions both as a heat dissipation member and a light guide member, making it possible to realize an air purifier that is compact yet has high light irradiation efficiency.

[0055] As shown in Fig. 5, a wavelength conversion member 14 may be disposed on the inside of the upper surface of the cover 10 at a position visible from the outside through the first opening 11. The wavelength conversion member 14 absorbs light from the light source 21 and emits light of a different wavelength from the light from the light source 21. Because ultraviolet light is invisible to the naked eye, it is difficult to determine visually whether the air purifying device 100 is operating. By providing a wavelength conversion member 14 that absorbs and emits ultraviolet light, the wavelength conversion member 14 emits light during operation, making it possible to visually confirm that the air purifying device is operating.

[0056] The wavelength conversion member 14 is made of, for example, a resin containing phosphor particles. 10 O 17 :Eu, (Sr, Ca, Ba) 10 Blue phosphor particles such as (PO4)6Cl2:Eu, green phosphor particles such as LaPO4:Ce,Tb, ZnSiO2:Mn, and red phosphor particles such as Y2O3:Eu, Y(PV)O4:Eu, Y2O2S:Eu, 3.5MgO·0.5MgF2·GeO2:Mn can be used.

[0057] A photocatalyst may be disposed at a location inside the cover 10 where light from the light source 21 is irradiated. By disposing a photocatalyst, the deodorizing function of the air purifier can be improved. A photocatalyst may be disposed on the surface of the heat dissipation fins 26, but heat will be generated when ultraviolet light is absorbed by the photocatalyst. In addition, the light reflectance will decrease, which will result in further heat generation. Because of this decrease in heat dissipation performance, it is preferable not to dispose a photocatalyst on the heat dissipation fins 26.

[0058] In addition to the light source 21, a temperature sensor such as a thermistor may be arranged on the substrate 22. The temperature sensor detects the temperature near the light source 21. When the amount of air blowing on the light source 21 decreases, the light source 21 is no longer air-cooled, and the temperature of the substrate near the light source 21 rises. By providing a circuit that stops the power supply to the light source 21 when the temperature exceeds a certain level, it is possible to provide a fail-safe function that can turn off the light source 21 when there is no wind.

[0059] Next, we will explain the advantage of arranging the light source 21 on an extension of the flow path formed by the heat sink 24. Fig. 8 is a YZ plane view showing the simulation results of the irradiation distribution of light from the light source 21 in the state of Fig. 4. The closer to white an area is, the more irradiated it is, and the closer to black an area is, the less irradiated it is. The bottom side of the page is the side where the light source 21 is arranged.

[0060] In Fig. 8(a), the center of the light source 21 is disposed on an extension line of the heat dissipation fin 26 in the YZ plane. In Fig. 8(b) and Fig. 8(c), the center of the light source 21 is disposed at the center of the flow path in the YZ plane. In Fig. 8(a) and Fig. 8(b), the full angle at half maximum (2θ1 / 2) of the light source 21 is 110°, whereas in Fig. 8(c), the full angle at half maximum (2θ1 / 2) of the light source 21 is 60°.

[0061] As shown in Figure 8(a), when the center of the light source 21 is positioned on the extension line of the heat dissipation fin 26, the amount of light irradiated upward is insufficient compared to the arrangements of Figures 8(b) and 8(c). In contrast, in the arrangement of Figure 8(b), where the center of the light source 21 is positioned at the center of the flow path, it can be seen that light is irradiated upward more than in the arrangement of Figure 8(a). Furthermore, it can be seen that by narrowing the light distribution of the light source 21, light is irradiated uniformly up to the top of the heat sink 24, as shown in Figure 8(c).

[0062] If the cumulative amount of light irradiated onto the air discharged from the exhaust port of the air purifier in the arrangement of Fig. 8(a) is taken as 100%, then it was 112% in the arrangement of Fig. 8(b) and 140% in the arrangement of Fig. 8(c). From these results, it can be seen that it is preferable to position the center of light source 21 at the center of the flow path, and that it is preferable to narrow the light distribution angle of light source 21 and irradiate light between heat dissipation fins 26.

[0063] 6 and 7 show an example in which the air purifying device 100 shown in FIGS. 1 and 2 is housed in a housing 41. In FIG. [Case] The housing 41 is a housing having a main body 42 in the shape of a vertical rectangular parallelepiped and a protrusion 43 protruding in the -X direction from the main body 42. A third opening 44 is provided at the top of the front side of the main body 42 of the housing 41, and a fourth opening 45 is provided from the center to the top of the back side of the protrusion 43. The protrusion 43 protrudes to allow air to efficiently enter the second opening 12, and is hollow inside.

[0064] The opening shape of the third opening 44 is a rectangle that is longer in the Y direction than in the Z direction, and the opening shape of the fourth opening 45 is a rectangle that is longer in the Z direction than in the Y direction. The third opening 44 is formed at a position overlapping the first opening 11 and functions as an exhaust port like the first opening 11. The fourth opening 45 functions as an air intake port like the second opening 12, but the fourth opening 45 and the second opening 12 do not overlap and are formed at different positions. This prevents the light source 21 from being exposed to the outside. Furthermore, by making the opening area of ​​the fourth opening 45 larger than the opening area of ​​the second opening 12, the amount of air taken in can be increased. The second opening 12 is covered by the protrusion 43 of the housing 41.

[0065] 7, the attachment portion 13 protrudes from the fourth opening 45. A portion of the cover 10 of the air purifying device 100 is exposed through the fourth opening 45. The gas taken in through the fourth opening 45 flows in the −Z direction and is taken in through the second opening 12.

[0066] The main body 42 of the housing 41 is not directly irradiated with ultraviolet light. Therefore, the material of the main body 42 can be, for example, a resin such as ABS, PC, or PMMA. Since the protrusions 43 are irradiated with ultraviolet light, it is preferable to use Al, SUS, or the like.

[0067] (experiment) Assuming that the air purifying device 101 according to the embodiment shown in FIGS. 6 and 7 is attached to an air conditioner in a general automobile, the following characteristics were measured. Light source used: LED with peak wavelength of 280 nm Air purifier dimensions: 100mm x 75mm x 35mm Input power: 18W LED radiant flux: 560mW Outlet wind speed: 1.8 m / s LED surface temperature: 54.9℃ The cumulative amount of light irradiated onto the air discharged from the exhaust port of the air purifier: 2.3 mJ / cm 2 Volume of air discharged from the exhaust port of the air purifier: 0.05 m 3 / min Interior volume of a typical car: 3.6m 3

[0068] In addition, an LED with a peak wavelength of 280 nm, created in the same way as the light source used, was used to conduct an inactivation experiment on microdroplet-like COVID-19 (alpha strain, UK variant). As a result, in a one-pass test, the inactivation rate was approximately 1 mJ / cm. 2 It was confirmed that the infectious titer was reduced to 1 / 10 or less (virus survival rate 4.5%) with this cumulative light dose.

[0069] From these results, it is estimated that when the air purifying device 101 according to this embodiment is installed in a typical car air conditioner, it can inactivate 95% or more of the new coronavirus in about 72 minutes. It is also clear that the surface temperature of the LED is kept at around 55 degrees, providing appropriate heat dissipation.

[0070] As explained above, the present invention having the technical features disclosed in the specification is not limited to the structures described in the embodiments of the specification. For example, the present invention can also be applied to an air purifying device having components not disclosed in the embodiments. [Industrial Applicability]

[0071] The air purifying device described in the embodiment can be used as an air purifying device attached to an automobile air conditioner. However, the present invention is not limited to this, and can also be used for sterilizing air conditioning systems, entire buildings such as nursing homes, hospitals, and buildings, and sterilizing clean rooms. [Explanation of symbols]

[0072] 100, 101 Air purifier 10 Cover 11 First opening 12 Second opening 13 Mounting part 14 Wavelength conversion material 20 Light source unit 21 Light source 22 PCB 23 Heat pipe 24 Heatsink 25 base plate 26 Heat dissipation fin 27 Screw 30 Support member 31 Bottom 32 Side 33 Recess 34 Page 1 35 2nd page 36 Page 3 37 Page 4 41 Case 42 Main body 43 Convex part 44 Third Opening 45 4th opening

Claims

1. a generally L-shaped support member having a bottom and sides; a substrate disposed on the bottom; a light source that is disposed on the substrate and is capable of emitting ultraviolet light; a heat sink having heat dissipation fins disposed on the side; a substantially L-shaped heat pipe at least a portion of which is accommodated in a recess formed in the support member; a cover that covers at least a portion of the heat sink, the bottom of the support member has a first surface and a second surface located opposite to the first surface, and the substrate is disposed on the first surface side; the side portion of the support member has a third surface connected to the first surface and a fourth surface located opposite to the third surface, and the heat sink is disposed on the third surface side; The recessed portion is formed on the second surface side and the fourth surface side.

2. The light source is a plurality of light sources arranged along a first direction, The air purifying device according to claim 1 , wherein the flow path formed by the heat dissipation fins extends along a second direction intersecting the first direction.

3. The air purifying device according to claim 2 , wherein the plurality of light sources are arranged on an extension of the flow path.

4. The air purifying device according to any one of claims 1 to 3, wherein the light source is an LED having an emission peak wavelength of 250 nm or more and 290 nm or less.

5. The air purifying device according to any one of claims 1 to 4, wherein the heat sink has a surface made of aluminum.

6. The air purifying device according to any one of claims 1 to 5, wherein a wavelength conversion member is disposed inside the cover and in a position visible from the outside.

7. The air purifying device according to any one of claims 1 to 6, wherein a photocatalyst is disposed on the inside of the cover.

8. The air purifying device according to any one of claims 1 to 7, wherein a temperature sensor is disposed on the substrate.

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