KR20160065390A - An Air Purifier - Google Patents

Abstract

The present invention relates to an air purifier. More specifically, an optical catalyst filter is installed in a housing thereof, and a suctioning hole is installed in the floor of the housing, wherein the housing is supported by a base housing for supporting the housing in a lower side of the housing. The air purifier provided according to the present invention comprises: a housing (20, 30, 40) having an inlet (231) and an outlet (45); a fan (60) installed in the housing and forcibly discharging air to an outlet direction; an optical catalyst filter (80) installed in the housing, and disposed in an air discharging direction of the fan (60); a light source installed between the fan (60) and the optical catalyst filter (80), and irradiating light toward the optical catalyst filter (80); and a base housing (10) installed in a lower end of the housing, and supporting the housing, so a lower surface of the housing is spaced apart from the floor thereof. According to the present invention, deodorization may be performed, and harmful gas may be removed.

Description

An Air Purifier

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air purifier, more particularly, to an air purifier in which a photocatalytic filter is provided inside a housing, a suction port is provided at the bottom of the housing, and a base housing supports the housing at a lower portion of the housing .

 The air purifier is a device that forces air to flow and filter the air flow path to filter dust or impurities mixed in the air. Conventional air purifiers collect dust through a filter or adsorb or decompose noxious gas contained in air.

When collecting dust from an air purifier, it is usually cleaned in the order of a pre-filter that filters large dust and a heap filter that filters fine dust. This is to prevent the relatively expensive HEPA filter from shortening its service life due to the filtering of large dust.

In addition, a filter capable of removing harmful gas may be installed in the air purifier. There are various methods for removing harmful gas, but a method of removing harmful gas by adsorbing harmful gas in the air using activated carbon or the like is common.

Another method for removing harmful gas is to irradiate light for activating the photocatalyst material, to flow air around the photocatalyst material, and to remove harmful gas in the air flowing through the photocatalytic reaction. Although there are many kinds of photocatalyst materials, titanium oxide (TiO ₂ ) is generally used.

Titanium oxide is activated by ultraviolet rays to cause a photocatalytic reaction. In recent years, photocatalyst materials reacting in the visible light range due to the harmfulness of ultraviolet rays have been developed.

In any case, these photocatalytic materials get the energy that they can activate from light. Therefore, ultraviolet rays should be irradiated on the photocatalyst material activated by ultraviolet rays. Therefore, in order to irradiate the photocatalyst material, it is inevitable that the light source and the photocatalyst material are separated from each other by a predetermined distance.

However, a conventional conventional household or small air purifier structure is generally flat and flat, and is unsuitable for applying a photocatalytic filter.

Therefore, in order to apply a photocatalytic filter structure to a domestic or small-sized air purifier, it is necessary to newly install the photocatalytic filter structure in the air flow direction, the air suction direction and the discharge direction, the filter installation structure, the relationship between the filter installation direction and the air flow direction, And must be designed.

Further, when the ultraviolet light source and the photocatalytic filter are constituted in a small air purifier, the characteristics of the ultraviolet light source and the characteristics of the photocatalytic filter must be tuned to such an extent that the effect can be sufficiently obtained.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a small household air purifier structure for removing deodorant and harmful gas using a photocatalytic filter and a light source.

It is another object of the present invention to provide an air purifier structure in which the flow resistance of air is minimized to increase the photocatalytic reaction efficiency.

It is another object of the present invention to provide an air flow direction capable of increasing the efficiency of the photocatalytic reaction, a mounting direction of the photocatalytic filter, a shape of the photocatalytic filter, a relationship between the photocatalytic filter and the light source,

It is another object of the present invention to provide an air purifier in which the maintenance and replacement of the filter is easy despite the compactness.

Another object of the present invention is to provide an air purifier in which various electric and electronic equipment are efficiently arranged.

In order to achieve the above-mentioned object, the present invention provides a method of arranging a structure for photocatalytic reaction in the order of a fan, a light source, and a photocatalytic filter along the flow direction of air while allowing air to flow upward in the body housing, An air inlet is formed and a base housing is further provided under the body housing to separate the body housing from the floor.

More specifically, the present invention relates to a refrigerator comprising: housings (20, 30, 40) having a suction port (231) and a discharge port (45); A fan 60 installed in the housing for forcibly discharging the air in the direction of the discharge port; A photocatalytic filter (80) installed in the housing and disposed in the air discharge direction of the fan (60); A light source installed between the fan (60) and the photocatalytic filter (80) and emitting light toward the photocatalytic filter; And a base housing (10) installed at a lower end of the housing to support the lower surface of the housing so as to be spaced apart from a floor.

The photocatalytic filter may have a form in which a plurality of cells having an air flow path are coated with a photocatalyst material on a support adjacent to each other, and the inlet of the air flow path is disposed toward the ultraviolet light source.

The housing (20, 30, 40) includes: an outer housing (20, 40) having the suction port (231) at a bottom portion and the discharge port (45) And an inner housing 30 on which the fan 60, the light source, and the photocatalytic filter 80 are installed.

The air outlet direction of the fan (60) is upward, and the photocatalytic filter can be fixed to the inner housing by being mounted on the upper part of the inner housing.

The outer housing includes an upper housing 40 including an upper surface on which the discharge port 45 is formed. The upper housing is detachably installed. The photocatalytic filter is inserted and removed through an opening provided separately from the upper housing. It can be withdrawn.

The light source may be a UV LED 51 having a peak wavelength of 360 to 370 nm.

The UV LED 51 may be installed in one or more elongated UV LED substrates 50 supported at both ends by a housing.

The base housing 10 includes a neck member 11 connected to the lower center of the housing and gradually widening toward the lower portion and a lower member 12 formed at the lower end of the neck member, 11 may be installed in a space between the neck member and the lower member so that the control PCB 13, which is in communication with the internal space of the housing, controls the operation of the air cleaner, and is equipped with a connector 14 to which external power is connected, have.

The housing includes a side housing 21 including a side surface thereof, and the side housing 21 may be provided with indicators 211, 212, and 213 for indicating an operation state of the air cleaner.

The base housing 10 includes a neck member 11 connected to a lower center of the housing and gradually widening toward a lower portion of the housing. The housing includes a lower housing 23 forming a lower portion thereof, An upper end of the member 11 and a central portion of the lower housing 23 are fixed and a suction port 231 may be formed at an outer peripheral portion of the central portion of the lower housing 23.

The lower housing 23 may include a plurality of ribs 232 radially extending from the central portion toward the outer circumferential surface, and a grate 233 formed between the plurality of ribs.

The housing (20, 30, 40) includes: an outer housing (20, 40) having the inlet (231) and the outlet (45); And an inner housing 30 in which the fan 60, the light source, and the photocatalytic filter 80 are installed, and the outer housing 20, 40 includes a side housing 21 including a side surface thereof, The mounting portion 25 of the inner housing may protrude inwardly from the inner circumference of the lower end of the side housing 21.

The inner housing includes a fan housing 32 on which the fan 60 is installed and a photocatalyst housing 33 on which the photocatalyst filter 80 and the light source are mounted, And the photocatalyst housing can be disposed above the fan housing.

The housing may include an upper housing 40 including an upper surface thereof, and the upper housing 40 may be provided with operating portions 41, 42, and 43.

According to the present invention, a photocatalytic filter and a light source can be installed inside a compact air purifier, and it is possible to remove noxious gas in the air.

According to the present invention, the air flow direction is made straight and the air flow resistance is reduced, so that the air purifying efficiency is high despite the small size of the air purifier.

According to the present invention, the efficiency of removing harmful gases is very high due to the structure and characteristics of the photocatalytic filter and the light source installed inside, even though the air purifier is compact.

Further, according to the present invention, maintenance of the air purifier is simple.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

1 is a perspective view of an air purifier according to the present invention,
Fig. 2 is a side sectional view of the air purifier of Fig. 1, and
3 is a perspective view of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

FIG. 1 is a perspective view of the air purifier according to the present invention, FIG. 2 is a side sectional view of the air purifier of FIG. 1, and FIG. 3 is a perspective view of FIG.

First, the external shape and structure of the air purifier according to the present invention will be described with reference to FIG. The air purifier according to the present invention includes an outer housing (20, 40) having a substantially cylindrical structure and a base housing (10) serving as a bridge for supporting the outer housings (20, 40). The base housing 10 has a shape for supporting a central portion of a lower surface of the outer housings 20 and 40 so that the bottom surface of the outer housing is exposed to the air. The outer housings 20 and 40 include a top housing 40 defining a top surface of the air cleaner and a body housing 20 defining the body of the air cleaner.

The upper housing 40 has a discharge port 45 formed upward. The discharge port is in the form of a grate, so that foreign matter does not enter the inside. A button (43) is formed at the front portion of the upper housing. Accordingly, the operation of the air purifier can be controlled by the user pressing down the button on the upper surface. The button may be a physical button or a touch-type button. By placing the button at the top, it is possible to prevent the air cleaner from moving even if a force is applied to the air cleaner while the user presses the button. When the button is placed on the front side of the air cleaner, there is a problem that the air cleaner is pushed backward each time the button is pressed. However, if the button is placed on the upper side, such a problem does not occur.

Next, an optic 213, which provides information about the operation of the air cleaner, is formed on the front surface of the body housing 20. Optics have better visibility than what is on the front surface. The body housing 20 is divided into a side housing 21 forming a side surface of the air purifier body and a lower housing 23 forming a bottom surface of the air purifier body. As shown, the side housing 21 is fastened to the upper housing 40 and fastened to the lower housing 23 downward. The lower housing 23 is coupled to the base housing 10 downward. As will be described later, the upper housing 40 is detachably fastened to the side housing 21.

Although not shown in FIG. 1, referring to FIG. 3, the air inlet 231 is formed in the lower housing 23 which forms the bottom of the outer housing. Therefore, according to the air purifier structure of the present invention, the air is sucked through the suction port 231 on the bottom surface and flows upward, and is discharged upward from the discharge port 45.

In the present invention, the discharge port is directed upward so that the flow of the purified air does not cause dust again sitting on the floor of the room. In addition, it is preferable that the discharge port is directed upward when the purified air is discharged to the side, because the person directly facing the wind may feel uncomfortable.

If the discharge port is configured as above, the flow of air in the air cleaner is directed downward from the bottom as a whole, which is advantageous in reducing the flow loss of air. However, since the conventional air purifier generally has a structure in which the body is in contact with the floor and the air intake port is formed on the side surface of the air purifier, when the conventional structure is applied as it is, And the flow loss is large.

Accordingly, the present invention supports the bottom of the outer housings 20 and 40 apart from the floor through the base housing 10, and an air inlet 231 is provided on the bottom of the outer housings 20 and 40 So that the air in the air cleaner flows from bottom to top as a whole. This has the effect of facilitating the flow of air simply, and further enhancing the photocatalytic reaction efficiency by the photocatalytic filter described later.

Next, the internal structure of the air purifier according to the present invention will be described with reference to FIGS. 2 and 3. FIG. An inner housing 30 for accommodating the photocatalytic filter 80, the UV LED substrate 50 and the fan 60 is installed in the space inside the outer housings 20 and 40. That is, the inner housing functions as a housing in which the internal structure of the air purifier is installed.

On the lower inner surface of the side housing 21, the mounting portion 25 is protruded inward. The inner housing is mounted on such an installation. The inner housing includes a fan housing 32 on which a fan 60 is installed and a photocatalyst housing 33 on which a photocatalytic filter and a UV LED substrate are mounted. The fan housing 32 is mounted on the mounting portion 25, And the photocatalyst housing is disposed on the fan housing. Accordingly, the inner housing is provided with the respective components in the order of the fan 60, the UV LED 50, and the photocatalytic filter 80 from below.

The fan 60 installed in the fan housing 32 generates a flow of air flowing upward. Accordingly, the air outside the air purifier flows through the suction port 231 formed on the bottom surface of the housings 20, 30, and 40, and then pressurized by the fan to flow upward.

The installation part 331 of the UV LED substrate 50 is provided on the upper part of the fan installation part 32 and the photocatalytic filter installation part (Not shown).

The UV LED substrate 50 mounted on the mounting portion 331 is in the shape of a long, long plate, and the UV LED 51 is mounted on the upper surface. The number of the substrates may correspond to the number of UV LEDs corresponding to the size of the air purifier. In an embodiment of the present invention, an air purifier using two substrates is shown. Although not shown, it is preferable to form a streamlined air induction shape having a downwardly convex cross section at the lower part of the UV LED substrate 50 to prevent air resistance from increasing due to the flat shape of the substrate.

The ultraviolet light irradiated from the UV LED has a diffusion angle of approximately 120 degrees and is irradiated toward the photocatalytic filter 80. The photocatalyst filter 80 has a structure in which a photocatalyst material is fixed on a support, and titanium oxide is used as a photocatalyst material in the present invention.

 The ultraviolet absorption coefficient of the photocatalytic filter according to the ultraviolet wavelength most absorbs the wavelength near 270 nm, and the absorption rate linearly decreases toward 400 nm. At first glance, it seems advantageous to use a UV LED with a peak wavelength of 270 nm. However, when actual UV LEDs were used, it was confirmed that the UV LED with the best photocatalytic activation was a UV LED having a peak wavelength of 365 nm. It can be confirmed that this is due to the luminous efficiency of the UV LED. In other words, since the light emission amount of the UV LED with a small peak wavelength falls sharply, the photocatalytic reaction is the best when the UV LED having a peak wavelength of 365 nm is actually used there was.

In other words, the UV LED having a peak wavelength around 270 nm is not actively reacting with the UV because the intensity of ultraviolet light itself is weak, which is far below the intensity of the ultraviolet ray required on the surface of the photocatalytic filter. Considering this fact, it is possible to consider using a large number of UV LEDs to increase the intensity of ultraviolet rays. However, since it interferes with air flow, there is a limit to increase the size of the substrate. The manufacturing cost and power consumption are rapidly increased.

As a result, it was confirmed that the deodorization efficiency of the photocatalytic filter was drastically decreased when UV LED having a peak wavelength of 340 nm or less was used.

In addition, when a UV LED having a peak wavelength of 380 nm or more is used, the ultraviolet absorption rate of the photocatalyst itself is very small and there is no difference from the conventional black light. Thus, there is no significant meaning to use the UV LED.

Experimental results show that UV LED with peak wavelength of 360nm or more and 370nm or less can maximize deodorization performance by the photocatalytic filter.

 The photocatalytic filter is a structure in which a photocatalyst material is coated on a support member in which a plurality of cells having an air flow path of a regular hexagonal cross section or a square cross section are formed adjacent to each other similar to a honeycomb type, Are arranged in the vertical direction, that is, in the direction toward the ultraviolet light source. When the photocatalytic filter is manufactured in this form, the ultraviolet rays are projected not only on the outer surface of the photocatalytic filter but also on the inner surface of the air flow path, so that the photocatalytic activation reaction can be further increased.

The distance between the UV LED 51 and the front face of the photocatalytic filter 80 facing the UV LED 51 depends on the change in the air flow characteristics depending on the distance between the UV LED substrate and the photocatalytic filter and on the area and intensity of ultraviolet rays reaching the photocatalyst Will be different. Experimental results showed that the deodorization efficiency dropped sharply when the distance between the UV LED and the front of the photocatalytic filter decreased to less than 2.5 cm or increased to more than 4 cm.

If the distance between the two is too close to 2.5 cm or less, the area of the photocatalytic filter irradiated with ultraviolet rays is reduced in the area of the photocatalytic filter. However, even if the intensity of ultraviolet light per unit area of the photocatalytic filter is increased, . In addition, when the UV LED substrate is too close to the photocatalytic filter, the air is not flowed to the intermediate region of the photocatalytic filter, which is mainly irradiated with ultraviolet rays, so that the amount of air in contact with the film is less in the region where the activation is best, Thereby reducing the deodorization efficiency. Also, if the distance between the two is too long to be more than 4 cm, the UV intensity per unit area of the photocatalytic filter decreases and the degree of activation of the photocatalyst decreases.

On the other hand, it is also necessary to consider the flow direction of the air. According to the present invention, the flow direction of the air is the same as the direction from the UV LED, which is an ultraviolet light source, to the photocatalytic filter.

Experimental results show that the flow of air in the same direction as the direction from the ultraviolet light source to the photocatalytic filter is superior to the flow of air in the opposite direction.

Since the photocatalytic filter has a structure in which air has to pass through a plurality of air flow paths, the air pressure drops due to the flow resistance while passing through the photocatalytic filter. On the other hand, the photocatalytic reaction becomes more active as the surface of the photocatalyst material is in contact with the air. Therefore, before the pressure drops through the photocatalytic filter, the air comes into contact with the photocatalyst material, and the harmful gas in the air is decomposed. After the air passes through the photocatalytic filter, the pressure is reduced and the harmful gas in the air is decomposed by contacting with the photocatalyst material The decomposition efficiency is higher. Therefore, in the present invention, air is flowed in a direction from the ultraviolet light source toward the photocatalytic filter, thereby further improving the air purification efficiency by the photocatalytic filter.

Next, as shown in the figure, the shape of the inner surface of the photocatalytic filter mounting portion 332 of the inner housing corresponds to the shape of the outer surface of the photocatalytic filter, and a step is formed at the lower end. Therefore, the photocatalytic filter 80 can be installed in such a manner that the photocatalytic filter 80 is lowered from the upper part of the inner housing.

On the other hand, the upper housing 40 of the outer housing is detachably mounted on the upper surface of the body housing 20. Accordingly, when the upper housing 40 is separated, an opening is formed in the upper part of the body housing 20, and it is possible to insert and remove the above-described photocatalytic filter through the opening.

A base housing 10 is provided at the lower end of the housing 20, 30, 40 having various components for purifying the air so that a bottom surface of the housing is spaced apart from an installation surface of the air cleaner.

The base housing 10 includes a neck member 11 connected to the center of the lower housing 23 and a lower member 12 formed at the lower end of the neck member. The neck member 11 is formed to be widened in a streamlined manner as it descends from the upper end connected to the lower housing to guide the flow of the air flowing into the inlet 231 formed in the lower housing 23. The suction port 231 is formed at the center portion of the lower housing 23 and serves as a passage for introducing air.

In the present invention, the base housing 10 is fixed to the bottom center portion of the body housing 20 to support the body housing. In view of the body housing, the loads of all the body housings are concentrated at the central portion of the lower housing 23 none. Therefore, the lower housing 23 must have sufficient strength to withstand this. However, as described above, since the suction port 231 is formed in the lower housing 23, the strength of the suction port 231 is rather weak.

Accordingly, the present invention reinforces the strength of the lower housing by forming a plurality of ribs 232 radially extending from the central portion to the outer peripheral surface of the lower housing 23. Also, the strength of the ribs is strengthened again by connecting the arc-shaped grit 233 between the ribs 232 again. Therefore, the grate 233 functions not only to prevent foreign matter from passing through the air purifier, but also to reinforce the strength of the lower housing 23.

According to the present invention, the electric and electronic parts of the air purifier are also arranged very rationally. The base housing 10 serves not only to support the housings 20, 30 and 40 but also the internal space thereof. A PCB 13 for controlling the operation of each configuration of the air cleaner is installed in a space between the neck member 11 and the bottom member 12 constituting the base housing 10. Further, a connector 14 to which an external power source is connected is provided at the rear end of the control PCB 13.

The power received through the connector is transmitted to the fan 60 installed in the inner housing and the UV LED substrate 50. The power source is connected to the display portions 211, 212 and 213 provided in front of the side housing 21 and the operating portions 41, 42 and 43 provided in the upper housing 40. These wirings extend into the housing through the connecting portion of the neck member 11 and the lower housing 23 communicating with each other.

A display PCB 212 is provided on a coupling part 211 formed on the inside of the side housing 21 and an optical part 213 is formed on a part of the front housing adjacent to the coupling part 211 to form a light emitting diode The operation of the air cleaner is displayed on the outside in such a manner as on-off, color, and flashing.

On the other hand, an operation PCB 42 is provided on the fastening part 41 formed on the lower surface of the upper housing 40 and a button 43 is formed on the front part of the upper housing 40 as a position close to the display part.

Thus, the power lines connected to the two PCBs 212 and 42 can be wired together along the inner surface of the side housing.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it can be done. Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments.

10: Base housing
11: neck member
12: Lower surface member
13: Control PCB
14: Connector
20, 30, 40: housing
20, 40: outer housing
20: Body housing
21: side housing
211: Display PCB fastening portion
212: Display PCB
213: Optics
23: Lower housing
231:
232: rib
233: Great
25: Mounting part (for fixing the inner housing)
30: inner housing
32: Fan housing
33: Housing for photocatalyst
331: UV LED board mounting part
332: Photocatalytic filter installation part
40: upper housing
41: Operation PCB fastening part
42: Operation PCB
43: Button
45:
50: UV LED substrate
51: UV LED
60: Fans
80: Photocatalytic filter

Claims (14)

A housing (20, 30, 40) having a suction port (231) and a discharge port (45);
A fan 60 installed in the housing for forcibly discharging the air in the direction of the discharge port;
A photocatalytic filter (80) installed in the housing and disposed in the air discharge direction of the fan (60);
A light source installed between the fan (60) and the photocatalytic filter (80) and emitting light toward the photocatalytic filter; And
And a base housing (10) installed at a lower end of the housing to support the lower surface of the housing so as to be spaced apart from the floor.
The method according to claim 1,
Wherein the photocatalytic filter has a shape in which a plurality of cells having an air flow path are coated with a photocatalyst material on a support member adjacent to each other, and an inlet of the air flow path is disposed toward the ultraviolet light source.
The method according to claim 1,
The housing (20, 30, 40) comprises:
An outer housing (20, 40) provided with the suction port (231) at a bottom portion and the discharge port (45) provided on an upper surface thereof; And
And an inner housing (30) in which the fan (60), a light source, and a photocatalytic filter (80) are installed.
The method of claim 3,
The air discharge direction of the fan (60) is upward,
Wherein the photocatalytic filter is fitted and fixed to the inner housing in a state of being placed on an upper portion of the inner housing.
The method of claim 4,
The outer housing includes a top housing 40 including an upper surface on which the outlet 45 is formed, the top housing is detachably installed,
And the photocatalytic filter can be inserted and extracted through an opening provided separately from the upper housing.
The method according to claim 1,
Wherein the light source is a UV LED (51) having a peak wavelength of 360 to 370 nm.
The method of claim 6,
The UV LED (51) is installed on at least one elongated UV LED substrate (50) supported at both ends by a housing.
The method according to claim 1,
The base housing 10 includes a neck member 11 connected to the lower center of the housing and widening toward the lower portion and a lower member 12 formed at the lower end of the neck member,
The upper end of the neck member 11 communicates with the inner space of the housing,
Wherein a control PCB (13) having a connector (14) for controlling the operation of the air purifier and connected to an external power source is installed in a space between the neck member and the bottom member.
The method of claim 8,
The housing includes a side housing (21) including its side,
Wherein the side housing (21) is provided with display portions (211, 212, 213) for indicating the operation state of the air purifier.
The method according to claim 1,
The base housing 10 includes a neck member 11 connected to the lower center of the housing and gradually widening toward the bottom,
The housing includes a lower housing (23) forming a lower portion thereof,
An upper end of the neck member 11 and a central portion of the lower housing 23 are fixed and an inlet 231 is formed at an outer peripheral portion of a central portion of the lower housing 23.
The method of claim 10,
The lower housing (23) includes a plurality of ribs (232) extending radially from the central portion toward the outer peripheral surface, and a grate (233) formed between the plurality of ribs.
The method according to claim 1,
The housing (20, 30, 40) comprises:
An outer housing (20, 40) having the inlet (231) and the outlet (45); And
And an inner housing 30 on which the fan 60, the light source, and the photocatalytic filter 80 are installed,
Wherein the outer housing includes a side housing including a side surface thereof and an installation portion of the inner housing protrudes inwardly at an inner periphery of a lower end of the side housing.
The method of claim 12,
Said inner housing comprising:
A fan housing 32 on which the fan 60 is installed,
And a photocatalyst housing (33) on which the photocatalytic filter (80) and a light source are installed,
Wherein the fan housing is disposed at an upper portion of the installation portion, and the photocatalytic housing is disposed at an upper portion of the fan housing.
The method according to claim 1,
Wherein the housing includes a top housing including an upper surface thereof, and the top housing includes an operating portion.

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