KR20200044333A - Purification apparatus - Google Patents

Abstract

A purification device according to one embodiment comprises a photocatalyst filter; and a light source module which emits light to the photocatalyst filter to activate a photocatalytic reaction. In the light source module, the wavelength of light whose relative intensity is the strongest among wavelengths of emitting lights is 380 to 420 nm. The photocatalyst filter comprises tungsten oxide. The light source module can be spaced a predetermined distance apart from the photocatalyst filter. According to the present invention, heat dissipation properties can be improved by natural convection.

Description

Purification device {PURIFICATION APPARATUS}

The embodiment relates to a purification device.

Recently, as demand for air cleaners for purifying indoor air has increased due to air pollution, fine dust, and yellow dust, various types of air cleaners have been produced. For example, a non-woven type filter or an electrostatic filtration type electrostatic filter is currently used in the mass-produced air cleaner, but it is possible to filter dust, but it is difficult to remove odors or sterilize bacteria.

In order to solve this problem, a filter technology using a photocatalytic material capable of performing air purification functions such as deodorization and sterilization has been studied. The photocatalytic material generates radicals when it receives ultraviolet rays. It can sterilize microorganisms by the strong oxidizing power of these radicals and decompose odorous substances that cause odor.

In order to use such a photocatalyst material, it is necessary to be provided with a separate light source for irradiating light so that the photocatalyst material is activated. Here, the light source may be embodied as an ultraviolet (UV) lamp or an ultraviolet LED.

However, UV lamps cause environmental pollution by including harmful chemicals such as mercury (Hg) in order to maintain a stable output, and their lifetime is very short due to low output, and selectively select an appropriate wavelength for activating a photocatalyst. There is a problem in that deodorization efficiency is poor because it cannot be investigated.

In addition, UV LEDs are vulnerable to heat dissipation due to high power consumption, and if separate heat sinks and cooling circulation channels are installed to improve heat dissipation characteristics, costs increase and the product becomes large.

In addition, the photocatalytic filter that decomposes odor substances needs to be replaced at regular intervals in order to prevent the growth of captured bacteria, but the consumer needs to cover a considerable cost to replace the filter of the air purifier, thereby extending the life of the filter as much as possible. And, there is an increasing technical need to improve the performance of capture and odor deodorization.

Thus, the embodiment is to provide a purifying device capable of improving the deodorizing efficiency and extending the replacement cycle or life of the filter while improving heat dissipation characteristics by natural convection.

The technical problem to be solved in the embodiment is not limited to the technical problem mentioned above, and another technical problem not mentioned will be clearly understood by a person having ordinary knowledge in the technical field to which the present invention belongs from the following description. Will be able to.

Purification apparatus according to an embodiment, a photocatalyst filter; A light source module that activates a photocatalytic reaction by irradiating light to the photocatalyst filter, wherein the light source module has a wavelength of 380 nm to 420 nm, which has the strongest relative intensity among the wavelengths of light emitted, and the photocatalyst filter includes tungsten oxide. And, the light source module and the photocatalyst filter may be spaced a predetermined distance.

Here, the predetermined distance may be 7.5mm to 12mm.

The purification device may further include an inlet and an outlet, and the photocatalytic filter may be disposed close to the inlet, and the light source module may be disposed close to the outlet.

The purification device further includes a hepa filter, and the hepa filter is disposed to surround the photocatalyst filter, but may be disposed closer to the inlet than the photocatalyst filter.

In the photocatalyst filter, a photocatalyst may be coated on a surface of a porous structure filled with an adsorbent.

Further, the light source module includes a substrate and a plurality of light emitting device packages disposed on the substrate, the plurality of light emitting device packages are arranged at equal intervals, and the substrate has a maximum width in a horizontal direction, but the horizontal The maximum width of the direction may be 25 mm to 35 mm.

In addition, the diameter of the substrate may be formed smaller than the inner diameter of the photocatalyst filter.

Further, the light source module may selectively drive some or all of the plurality of light emitting device packages.

Meanwhile, the fluid introduced into the suction port may be discharged through the photocatalyst filter and the light source module to the discharge port.

The purification apparatus according to an embodiment may improve heat dissipation characteristics by natural convection by disposing a light source module at a predetermined distance from the top of the filter so as to face the discharge path of air.

In addition, the light source module according to an embodiment outputs light in a wavelength band matching the maximum activation wavelength of the photocatalyst material coated on the surface of the photocatalyst filter, thereby improving the photocatalytic reaction performance and extending the replacement cycle or life of the filter. have.

The effects obtainable in this embodiment are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description. .

1 is a perspective view showing the arrangement of a purification device according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line A-A 'shown in FIG. 1.
3 is a cross-sectional view taken along line B-B 'shown in FIG. 1.
4A to 4B show perspective views of a light source module according to an embodiment of the present invention.
5 is a perspective view of a light source module according to another embodiment of the present invention.
6 is a graph comparing the removal rate of acetaldehyde according to power consumption between a 405nm LED and a white LED according to an embodiment.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiment may be variously changed and have various forms, and specific embodiments will be illustrated in the drawings and described in detail in the text. However, it is not intended to limit the embodiment to a specific disclosure form, it should be understood that includes all modifications, equivalents, or substitutes included in the spirit and scope of the embodiment. Therefore, embodiments may be combined in various forms without departing from the spirit of the invention.

In addition, terms specifically defined in consideration of the configuration and operation of the embodiments are only for describing the embodiments, and do not limit the scope of the embodiments.

In the description of the embodiment, when described as being formed on the "top (top)" or "bottom (bottom) (on or under)" of each element, the top (top) or bottom (bottom) (on or under) ) Includes both two elements directly contacting each other or one or more other elements formed indirectly between the two elements. In addition, when expressed as "up (up)" or "down (down) (on or under)", it may include the meaning of the downward direction as well as the upward direction based on one element.

In addition, relational terms, such as "top / top / top" and "bottom / bottom / bottom" as used below, do not necessarily require or imply any physical or logical relationship or order between such entities or elements, It can also be used to distinguish one entity or element from another.

Terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "include" or "have" are intended to indicate the presence of features, numbers, steps, actions, components, parts or combinations thereof described herein, one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Unless defined otherwise, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms, such as those defined in a commonly used dictionary, can be interpreted as having meanings that are consistent with meanings in the context of related technologies, and are interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not work.

Hereinafter, a purification device according to an embodiment will be described with reference to the accompanying drawings.

1 is a perspective view showing an arrangement of a purification device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line A-A 'shown in FIG. 1.

1 and 2, the purification apparatus 10 using a photocatalyst according to an embodiment of the present invention includes a housing 100, a filter unit 200, a light source module 300, and a blower fan 400 It can contain.

The housing 100 includes other components of the purification device 10 therein and may be formed in a cylindrical shape to form the overall appearance of the purification device 10. However, the shape of the housing 100 is not limited thereto.

The housing 100 may include an intake port 110 through which external air is introduced, and a discharge port 120 through which purified air is discharged from inside the housing 100. The air containing contaminants flows in through the intake port 110 disposed on the side and the bottom of the housing 100, and the air in which the malodorous material is decomposed through the discharge port 120 disposed on the top of the housing 100 is external. Can be discharged.

The intake port 110 may include a plurality of through holes 110a formed by at least a portion of the housing 100 passing through, and the through holes 110a can intake air from any direction based on the housing 100. So that it can be evenly formed in the circumferential direction along the outer peripheral surface of the housing 100. In this way, a plurality of through holes are formed along the outer circumferential surface of the housing 100, so that the intake amount of air can be increased.

The discharge port 120 may have a plurality of grills 120a disposed in an annular shape, and the grill 120a discharges air so that the purified air inside the housing 100 can be discharged upwardly from the housing 100. You can guide the route.

On the other hand, the housing 100 is the light source module 220 is located at the height of the through hole is not formed to prevent the ultraviolet light from leaking to the outside, the inner surface is coated with aluminum or the like that can block ultraviolet light or the part itself May be formed of aluminum or the like.

The filter unit 200 includes at least one filter (210, 220) for removing contaminants of the air sucked from the outside through the inlet 110, each of the at least one filter (210, 220) is empty inside It can be made into a cylindrical shape. However, this is only exemplary, and the shapes of the filters 210 and 220 may vary depending on the shape of the housing 100.

Meanwhile, the air that has passed through the plurality of through holes 110a passes through the outer circumferential surface of the filter unit 200 and flows into the inside, and the filter unit 200 is passed through the opening 230 formed at the top of the filter unit 200. Can be discharged from

Here, the at least one filter 210 and 220 may include at least one of a HEPA filter 210 and a photocatalyst filter 220.

The HEPA (High Efficiency Particulate Air) filter 210 is a part through which the air introduced into the housing 100 passes for the first time, among particulates contained in the air, such as particulate matter, such as fine dust, mold, and harmful bacteria It can serve to filter the back. For example, the HEPA filter 210 may be a high-efficiency filter capable of removing 99% or more particles having a particle diameter of 0.3 μm.

In addition, according to another embodiment, a pre-filter (not shown) may be formed outside the hepa filter 210. The pre-filter (not shown) may be in contact with air before the HEPA filter 210, and the filtration efficiency of the HEPA filter 210 may be further improved by allowing large particles to be filtered.

The air filtered from the HEPA filter 210 passes through the photocatalyst filter 220 disposed inside the HEPA filter 210 and is sterilized, deodorized, and antibacterial, and thus is purified and is opened in the upper portion of the filter unit 200. ). Here, the HEPA filter 210 may be disposed surrounding the photocatalyst filter 220 and may be disposed closer to the inlet 110 than the photocatalyst filter 220.

The photocatalyst filter 220 may be formed by coating a photocatalyst on a surface of a porous structure filled with an adsorbent, and may generate a photocatalytic reaction by receiving light in a predetermined wavelength band from the light source module 300. At this time, the adsorbent may adsorb ammonia and acetic acid first to increase the decomposition efficiency of acetaldehyde, which reacts later than ammonia and acetic acid in a competitive reaction by a photocatalyst. Here, the adsorbent according to an embodiment includes activated carbon, zeolite, sepolite, etc., and the photocatalyst is tungsten oxide (WO ₃ ), silicon oxide (SiO ₂ ), or zirconium oxide (ZnO). ), Etc., but this is only exemplary and the scope of the present invention is not limited thereto.

The adsorbent filled in the photocatalyst filter 220 adsorbs and removes odorous substances such as ammonia and acetic acid contained in the filtered air, such as gaseous substances such as VOCs (volatile organic compounds), VICs (volatile inorganic compounds) and harmful gases. In addition, the photocatalyst coated on the surface can improve deodorization and antibacterial efficiency by decomposing non-adsorbed odor substances such as acetaldehyde through photocatalytic reaction with light in a predetermined wavelength band.

A and / or the superoxide ion (O ^2-) can be generated, this time generated ^- in more detail, when the photocatalyst I excited by the photocatalytic reaction the hydroxy radical (OH) that has a strong oxidizing power on the surface of the photocatalytic filter 220 hydroxyl radical (OH ^-) can be changed into water and carbon dioxide that does not harm the human body by decomposing the malodorous substances such as acetaldehyde contained in the air that passes through the photocatalytic filter 220. Therefore, most of the odor particles and odor substances contained in the air can be removed by oxidation.

As described above, according to the arrangement order of the filter unit 210 according to the air flow path of the purification device 10, the air sucked into the housing 100 includes a pre-filter (not shown) and a HEPA filter 210. By passing through, particulate matter among the pollutants contained in the air is filtered, and odor substances such as ammonia and acetic acid are adsorbed and removed while passing through the sensitizer filled in the photocatalyst filter 220, and through the photocatalytic reaction of the photocatalyst filter 220 The malodorous substances that are not adsorbed, such as acetaldehyde, are decomposed and purified air may be discharged to the outlet 120. In summary, the fluid introduced into the suction port 110 may be discharged through the HEPA filter 210, the photocatalyst filter 220, and the light source module 300 to the discharge port 120.

The light source module 300 may include a substrate 310 and at least one light emitting device package 320 disposed on one surface of the substrate 310. Hereinafter, for convenience of description, the light emitting device package 320 will be referred to as a light source 320.

The light source 320 may irradiate light of a predetermined wavelength band with the photocatalyst filter 220 to activate the photocatalyst material coated on the surface of the photocatalyst filter 220, wherein the light emitting device package 320 has a predetermined wavelength band. It means the wavelength of the light having the strongest relative intensity among the wavelengths of light emitting light, for example, a peak wavelength.

In addition, the predetermined wavelength band output from the light source 320 may include an activation wavelength band of the photocatalytic material. For example, the predetermined wavelength band may include a wavelength band of 380 nm to 420 nm so that the decomposition efficiency of the photocatalytic material applied to an embodiment of the present invention, such as tungsten oxide (WO ₃ ), can be improved. , More preferably, it may be 400nm to 410nm.

The reason is that the photocatalytic reaction means a reaction in which a photocatalytic material is decomposed into radicals and / or ions by light in a predetermined wavelength band excited by the photocatalyst filter 220, and the predetermined wavelength band output by the light source 320 This is because when the activation wavelength band of the photocatalyst material is matched, the photocatalytic reaction speed is increased, deodorization or antibacterial efficiency is improved, and the replacement cycle or life of the photocatalyst filter 220 can be extended. A detailed description thereof will be described later with reference to Tables 1 to 6.

The light source module 300 is spaced a predetermined distance from the top of the filter unit 200, and may be disposed facing the top of the filter unit 200. In addition, the photocatalyst filter 220 may be disposed close to the suction port 110, and the light source module 300 may be disposed close to the discharge port 120. Alternatively, the light source module 300 is disposed between the filter unit 200 and the discharge port 120, and may be positioned to face the discharge path fd of air sucked under the blowing fan 400. Here, the flow of air flowing along the discharge path is indicated by 'fd'.

In general, the deodorization efficiency depends on the photocatalytic reaction rate, and a high-power light source 320 is required to increase the photocatalytic reaction rate. However, when the heat generated from the high-power light source 320 is not effectively discharged to the outside, the luminous efficiency is reduced not only due to the decrease in the net voltage due to the temperature rise of the light source 320, but also the life of the light source 320. Can be shortened.

Accordingly, as described above, heat dissipation characteristics may be improved by positioning the light source module 300 according to an embodiment facing the discharge path fd of air. Specifically, as shown in FIG. 1, when the light source module 300 is disposed at a predetermined distance from the top of the filter unit 200, the high-temperature heat generated by the light source 320 is caused by natural convection to the housing 100 ) Is flowed upward, and the heat discharge path fh is formed in the same direction as the air discharge path fd, so that the heat dissipation efficiency can be significantly improved. Here, the flow of air flowing along the heat dissipation path is indicated by 'fh'.

In addition, the light source module 300 according to an embodiment does not require a separate heat sink for cooling heat and a cooling circulation channel, thereby reducing costs and providing an effect of miniaturizing the size of the purification device 10. .

Meanwhile, the light source module 300 according to another embodiment may further include a heat sink (not shown, Heatsink) disposed on the central portion of the substrate 310 so as not to overlap with the at least one light source 320. The heat sink (not shown) can absorb heat generated from at least one light source 320 and radiate in the same direction as the air discharge path fd, and the heat dissipation effect may be improved through the heat sink (not shown). .

In addition, the light source module 300 according to another embodiment may selectively drive some or all of the plurality of light sources 320. For example, the driving control unit (not shown) included in the light source module 300 supplies a dimming signal (DIM, Dimming) for identifying the plurality of light sources 320 in block units to the light source driving unit (not shown), The light source driving unit (not shown) individually drives the plurality of light sources 224 in block units with pulse width modulation (PWM) in response to a dimming signal DIM to irradiate or radiate light in block units. The luminance can be individually adjusted. As such, by individually adjusting the amount of light emitted from the light source 320, the amount of light directly exposed to the user is minimized, and mechanical design or development suitable for the photobiological safety standard (IEC 62471) can be facilitated.

The blowing fan 400 is disposed on the filter unit 200 and can be rotated by the motor 410. When the blowing fan 400 is driven, external air is introduced through the intake port 110, and the introduced air passes through the filter unit 200, and contaminants in the air may be removed as described above in this process. have.

Then, the purified air flows into the blowing fan 400 through the opening 230 at the top of the filter unit 200, and the air that has passed through the blowing fan 400 flows upward of the housing 100 and discharges 120 It can be discharged upward.

Hereinafter, an arrangement relationship between the light source module 300 and the filter unit 200 will be described in more detail with reference to FIG. 3.

3 is a cross-sectional view taken along line B-B 'shown in FIG. 1.

Referring to FIG. 3, due to the light emission characteristics of the light source 320 having a predetermined directivity angle, the diameter d1 of the substrate 310 may be smaller than the inner diameter d2 of the photocatalyst filter 220. . The reason is that when the diameter d1 of the substrate 310 is larger than the inner diameter d2 of the photocatalyst filter 220, the illuminance efficiency decreases as the amount of light irradiated on the surface of the photocatalyst filter 220 decreases. . Here, the diameter d1 of the substrate 310 may range from 25 mm to 35 mm, and the inner diameter d2 of the photocatalytic filter 220 may range from 90 mm to 100 mm, but is not limited thereto.

In addition, the light source module 300 may be arranged spaced a predetermined distance from the top of the filter unit 200. Here, the separation distance h ₁ between the light source module 300 and the filter unit 200 means a height such that light emitted from the at least one light source 320 can be irradiated to the top of the photocatalyst filter 220. And, it can be varied in consideration of the uniformity and illuminance of light according to the directivity of at least one light source 320.

For example, assuming that the directivity angle of the at least one light source 320 is θ, and the distance on the horizontal line between the at least one light source 320 and the photocatalyst filter 220 is d3, the light source module 300 and the photocatalyst filter ( The separation distance h ₁ between 220) may be defined by Equation 1 below.

Referring to FIG. 3, the height of the photocatalyst filter h ₂ may be 150 mm to 200 mm, and the separation distance h ₁ between the light source module 300 and the photocatalyst filter 220 may be 0.05 h ₂ to 0.06 h ₂ . . For example, the separation distance h ₁ may be 7.5 mm to 12 mm.

In addition, the separation distance h ₁ between the light source module 300 and the photocatalytic filter 220 may be adjusted in consideration of the uniformity and illuminance of light irradiated to the photocatalyst filter 220 from Equation ( ₁ ). If the separation distance h ₁ becomes too large, the illuminance of light irradiated to the photocatalyst filter 220 decreases, so that activation of the catalyst may be lowered. And, if the separation distance h ₁ becomes too small, the difference in activation in the area facing the light source and the surrounding area becomes too large, which may be insufficient for the filter unit to operate efficiently. Accordingly, the separation distance h ₁ may be determined according to Equation 1 above.

In addition, the light source module 300 may be disposed at the top center of the filter unit 200, wherein the distance d3 on the horizontal line between the at least one light source 320 and the photocatalyst filter 220 is as shown in Equation 2 above. , It may correspond to half the difference between the inner diameter d2 of the photocatalyst filter 220 and the diameter d1 of the substrate 310. However, the scope of the present invention is not limited to this, and the light source module 300 may be formed at a position where the photocatalytic reaction rate can be increased. For example, when the photocatalyst filter 220 is manufactured in a cylindrical shape, the light source 320 may have the same central axis as the central axis of the cylindrical photocatalyst filter 220. However, when the photocatalyst filter 220 has a polygonal plane such as a hexahedron, the light source 320 may be disposed in consideration of the light uniformity of the plane, and may have a different central axis from the central axis of the photocatalyst filter 220. have.

Hereinafter, an arrangement state of at least one light source 320 disposed on the substrate 310 will be described with reference to FIG. 4.

4A to 4B show perspective views of a light source module according to an embodiment of the present invention. FIG. 4 (a) shows a form in which six light sources 320 are arranged at predetermined intervals on the substrate 310, and FIG. 4 (b) shows nine light sources 320 on the substrate 310 arranged at predetermined intervals. This is an example of each form.

Referring to FIGS. 4A to 4B, at least one light source may include a plurality of light sources 320 that are radially disposed on the substrate 310. However, the arrangement form of the plurality of light sources 320 is not limited thereto, and may be changed according to the shape of the substrate 310.

Further, the number of the plurality of light sources 320 according to an embodiment may be 3 to 15. However, the scope of the present invention is not limited to this, and the number of the plurality of light sources 320 may be less than 3 or greater than 15 depending on the diameter d1 of the substrate 310. Here, the diameter d1 of the substrate 310 means the maximum width in the horizontal direction of the substrate 310 shown in FIGS. 4A to 4B, and the maximum width in the horizontal direction ranges from 25 mm to 35 mm. Can be

In addition, the plurality of light sources 320 may be arranged spaced apart from each other on the substrate 310 at predetermined intervals, and the predetermined intervals may include equal intervals d _a and d _b . However, the plurality of light sources 320 may be arranged to have different intervals instead of equal intervals depending on the shape of the substrate 310.

In addition, a predetermined distance between a plurality of adjacent light sources 320 may vary depending on the size of the substrate 310, the number of light sources 320 and / or the directivity angle of the light sources 320. For example, the predetermined interval may be smaller as the directivity angle of the light source 320 is smaller and the number of light sources 320 is larger.

More specifically, referring to FIGS. 4A to 4B, the directivity angle θ _a of each of the six light sources 320 illustrated in FIG. 4A is illustrated in FIG. 4B. Each of the nine light sources 320 may be larger than the directivity angle θ _b , and a predetermined distance d _a between a plurality of adjacent light sources 320_1a, 320_2a, and 320_3a shown in FIG. 4 ( _a ) may be It may be smaller than a predetermined distance (d _b ) between a plurality of adjacent light sources 320_1b, 320_2b, and 320_3b shown in ( _b ) of 4. For example, when the diameter d1 of the substrate 310 is 30 mm, a predetermined distance d _a between the six light sources 320_1a, 320_2a, and 320_3a shown in FIG. 4A is 9 mm, and FIG. 4 The predetermined distance d _b between the nine light sources 320_1b, 320_2b, and 320_3b shown in ( _b ) may be 6 mm.

Meanwhile, according to another embodiment, a lens (not shown) may be formed on a plurality of light sources 320 arranged on the substrate 310. Here, the lens (not shown) formed on the light source 320 has a predetermined refractive index, and can adjust the directing angle of the emitted light according to the number of the plurality of light sources 320 arranged on the substrate 310.

Hereinafter, a light source module according to another embodiment of the present invention will be described with reference to FIG. 5.

5 is a perspective view of a light source module according to another embodiment of the present invention. The content overlapping with the above-described embodiment will not be described again, and will be described based on differences.

As shown in (a) to (b) of Figure 5, the light source module according to another embodiment, unlike the light source module 300 shown in Figure 4, the heat dissipation unit 330 in the center of the substrate 310 It can be further deployed.

Referring to (a) of FIG. 5, the light source module 300a according to another embodiment further includes a heat dissipation part 330 disposed over the central part of the substrate 310 so as not to overlap with at least one light source 320. It can contain.

The heat dissipation unit 330 may absorb heat generated from at least one light source 320 and radiate in the same direction as the air discharge path, and the heat dissipation effect may be improved through the heat dissipation unit 330. At this time, since heat radiated from the heat dissipation unit 330 flows upward of the housing by natural convection, a separate cooling circulation flow path may be omitted, and an effect of reducing the number of parts may be provided.

In addition, referring to (b) of FIG. 5, the light source module 300b according to another embodiment surrounds the outer circumferential surface of the heat dissipation unit 330, one end being coupled to the substrate 310 and the other end having an opening formed The lamp-shaped reflector 340 may be further included.

The reflector 340 has a shape in which an inner diameter becomes narrower toward an upward direction, and may be formed of a metal material having a heat dissipation function. Here, as an example of the metal material may include aluminum (Al), copper (Cu), copper alloy, and the like, but the scope of the present invention is not necessarily limited thereto.

The reflector 340 may increase the amount of light irradiated on the surface of the photocatalyst filter 220 by reflecting the light emitted from the at least one light source 320 and adjusting the directivity. Accordingly, as the illuminance value per unit area reaching the irradiation surface of the photocatalyst filter 220 increases, the photocatalytic reaction rate may be improved, and the deodorization efficiency may be further improved.

In addition, the reflector 340 may adjust the directivity angle of the light source 320 and simultaneously radiate heat generated from the at least one light source 320. Specifically, a part of the heat generated from the light source 320 is discharged to the outside through natural convection, and the other part can be conducted to the substrate 310. As described above, the heat conducted to the substrate 310 is radiated to the outside through the opening formed at the other end of the reflection unit 340 via the heat dissipation unit 330, or is rapidly transmitted through the reflection unit 340 coupled to the substrate 310. Can be discharged to the outside. In other words, the reflector 340 may provide an effect of widening the heat dissipation area, and heat dissipation characteristics may be further improved.

6 is a graph comparing the removal rate of acetaldehyde according to power consumption between a 405nm LED and a white LED according to an embodiment. Here, the 405nm LED may mean a light emitting diode that outputs light having a wavelength of 405nm.

In the experiment, the substrate coated with tungsten oxide (WO3) was sealed in a 3L gas bag under vacuum, and 2.5 ppm of acetaldehyde was injected, and a predetermined power consumption for 30 minutes per 405 nm LED and white LED was applied. It was carried out by application, and the removal rate of acetaldehyde was measured through liquid chromatography (HLPC, High Performance Liquid Chromatography) analysis. In this regard, the experimental results will be first described with reference to Table 1 below.

Table 1 below shows the experimental results of measuring the removal rate of acetaldehyde according to the power consumption between the 405nm LED and the white LED. Here, the removal rate of acetaldehyde means a value obtained by converting the ratio of the concentration removed by the photocatalytic reaction to the initial concentration of acetaldehyde as a percentage.

Power consumption (W) Applied current (mA) Removal rate of acetaldehyde (%) 405nm LED White LED 405nm LED White LED 1.1 60 70 60 41 2.2 120 130 72 58 3.3 170 190 80 66 4.4 230 260 85 72 5.5 290 320 88 77 6.6 340 380 92 81

Referring to Table 1, it can be seen that the removal rate of acetaldehyde is superior to that of a 405nm LED when a white LED is used as a light source included in the light source module. As described above, the removal rate of acetaldehyde is related to the deodorization efficiency by photocatalytic activation, and it can be determined that the higher the removal rate, the better the deodorization effect.

In addition, it can be seen that when using a 405nm LED rather than a white LED, the same photocatalytic reaction performance or deodorization effect can be expressed with less power consumption. For example, as shown in Table 1, the removal rate of acetaldehyde when the power consumption of the white LED is 6.6W (81%) is the removal rate of acetaldehyde when the power consumption of the 405nm LED is 3.3W (80%). Almost similar. At this time, it can be seen that the current applied to the light source is reduced to approximately 380mA for the white LED and 170mA for the 405nm LED, respectively.

In other words, since the 405nm LED has superior power consumption compared to the photocatalytic reaction compared to the white LED, the number of light sources can be increased to further improve the deodorization performance, and the 405nm LED has less applied current compared to the white LED, so the heat dissipation is smaller. The effect of improving the characteristics can be obtained.

Hereinafter, a graph comparing the removal rate of acetaldehyde according to power consumption between the 405nm LED and the white LED will be described by reflecting the experimental results in Table 1 above.

6, the x-axis of the graph represents the power consumption (W), and the y-axis represents the removal rate (%) of acetaldehyde.

Referring to FIG. 6, it can be seen that the removal rate of acetaldehyde increases nonlinearly with increasing power consumption. The reason is that as the power consumption increases, the amount of light output from the light source increases, and the activation reaction speed of the photocatalyst material increases.

In addition, it can be seen that the removal rate of acetaldehyde according to the wavelength of light output from the light source is excellent in the 405 nm wavelength band as shown in FIG. 6. This is because the output wavelength band of the 405 nm LED matches the maximum activation wavelength band of the photocatalytic material tungsten oxide (WO ₃ ). However, this is only exemplary, and the scope of the present invention is not necessarily limited to the 405nm LED. For example, as described above, an LED having a peak wavelength of 380 nm to 420 nm can be applied to the light source of the present invention.

In summary, it can be seen that an LED having an output wavelength band of 380 nm or more and 420 nm or less is used, and as the number of light sources is increased, deodorization performance by a photocatalyst filter can be improved.

Although only a few are described as described above in connection with the embodiments, various forms of implementation are possible. The technical contents of the above-described embodiments may be combined in various forms, unless the technologies are incompatible with each other, and may be implemented as a new embodiment.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit and essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all respects, but should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

Claims (10)

Photocatalyst filter;
Includes a; a light source module for activating a photocatalytic reaction by irradiating light to the photocatalyst filter,
In the light source module, the wavelength of light having the strongest relative intensity among the wavelengths of light emitting light is 380 nm to 420 nm,
The photocatalyst filter includes tungsten oxide,
The light source module and the photocatalyst filter, the purification device spaced a predetermined distance. According to claim 1,
The predetermined distance is 7.5mm to 12mm, purification device. According to claim 2,
Further comprising an inlet and outlet,
The photocatalytic filter is disposed close to the inlet,
The light source module, the purification device is disposed close to the discharge port. According to claim 3,
More hepa filters,
The HEPA filter is disposed around the photocatalyst filter, and is disposed closer to the inlet than the photocatalyst filter. According to claim 4,
The photocatalyst filter, the purification device, the photocatalyst is coated on the surface of the porous structure filled with the adsorbent. According to claim 4,
The light source module includes a substrate and a plurality of light emitting device packages disposed on the substrate,
The plurality of light emitting device packages are disposed at equal intervals, the purification device. The method of claim 6,
The substrate has a maximum width in the horizontal direction,
The maximum width of the horizontal direction is 25mm to 35mm, the purification device. The method of claim 7,
The diameter of the substrate is smaller than the inner diameter of the photocatalyst filter, the purification device. The method of claim 8,
The light source module, the purification device for selectively driving a part or all of the plurality of light emitting device packages. According to claim 2,
The fluid flowing into the suction port is discharged through the photocatalyst filter and the light source module to the discharge port.

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