KR102447990B1 - Air Sterilizer and Method for Controlling the Same - Google Patents

Abstract

The present invention relates to a space sterilization device which includes an excimer Ultraviolet (UV) lamp, which emits UV rays having the wavelength of 222 nm harmless even when emitted to the human body, to sterilize or kill various harmful bacteria floating in air in a living space so that an environment, in which the human body is exposed to harmful bacteria, is minimized, thereby forming a pleasant and healthy environment; and a control method thereof. According to one aspect of the present invention, the space sterilization device comprises: a UV head unit equipped with a UV lamp; a driving unit adjusting the emission direction of UV rays of the UV head unit; a sensor unit detecting whether a person exists in an area emitted with the UV lamp; a photocatalyst unit decomposing substances attached to the surface thereof by the UV rays emitted from the UV head unit; and a control unit controlling whether the UV rays emitted from the UV head unit are directed toward an indoor space or toward the photocatalyst unit according to the presence or absence of the human body detected by the sensor unit.

Description

Air Sterilizer and Method for Controlling the Same

The present invention relates to a space sterilization apparatus to which an excimer ultraviolet lamp is applied and a control method therefor, and more particularly, to a 222 nm wavelength excimer ultraviolet lamp that is harmless even when irradiated to the human body to sterilize various harmful bacteria floating in the air of a living space It relates to a space sterilization device and a method for controlling the same, which can create a pleasant and healthy environment by minimizing the environment in which the human body is exposed to harmful bacteria by removing or removing it.

Recently, the world is in chaos due to the pandemic caused by Corona 19, and cases of exposure to or infection of serious diseases through direct contact with the human body or spread to the space through the respiratory tract such as SARS, MERS, and pneumonia are occurring frequently. Moreover, in the case of highly contagious pathogens according to the globalization trend, they spread widely within a short period of time regardless of borders between countries.

As this situation frequently occurs, efforts to minimize the risk of infection by paying attention to personal hygiene are necessary, so the reality is that technologies for space sterilization by applying ultraviolet lamps, ozone, photocatalysts, plasma, etc. are widely applied.

As a prior art, when sterilization is performed by irradiating ultraviolet light, UVC ultraviolet light (especially 254.7 nm among 200 nm to 280 nm) is usually used. There is a risk of skin cancer when exposed for a long time through penetration, so it was either turned on in a limited space where the human body is not exposed to ultraviolet light, or it was turned on only in an empty room without people.

In particular, a human body detection sensor is installed to turn off the lamp when detecting a human body to sterilize only when no one is present, or it can be installed inside an air purifier to sterilize the air forced in by a fan or attach it to a filter. Since there is a restriction in sterilizing the infected pathogens, there is a problem that continuous sterilization is difficult when there are occupants in the room.

Moreover, in the case of the 222nm wavelength used in the present invention, it has been proven in several papers and clinical trials that there is no damage even when directly irradiated to the human body. There is a problem that causes a problem, so it is difficult to continuously sterilize if there are occupants in the room.

Korean Patent No. 10-2242894

An object of the present invention is to provide a space sterilization device that is safe for the human body and capable of continuously sterilizing regardless of the presence or absence of people or companion animals in the room and a method for controlling the same in order to solve the above problems. .

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

In order to solve the above problems, according to an aspect of the present invention, a head unit provided with an ultraviolet lamp; a driving unit for adjusting the ultraviolet irradiation direction of the ultraviolet head unit; a sensor unit for detecting whether a person is present in the area to which the ultraviolet lamp is irradiated; a photocatalyst unit for decomposing a material attached to the surface by ultraviolet rays irradiated from the head unit; A space sterilization apparatus comprising a; a control unit for controlling whether the ultraviolet rays irradiated from the head unit to the indoor space or to the photocatalyst according to the presence of the human body detected by the sensor unit; is disclosed.

An ultraviolet lamp is provided on one side of the head part, and the control unit positions the head part in a first direction so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room when a human body is not detected by the sensor part, and the sensor part When a human body is sensed in , the head unit may be rotated in the second direction so that the ultraviolet light emitted from the UV lamp is directed toward the photocatalyst unit.

The driving unit may include: a left-right adjustment unit for adjusting a left-right direction of the head part; It may include; a vertical direction adjustment unit for adjusting the vertical tilt angle of the head portion.

Or, according to another aspect of the present invention, the head portion, the first irradiation portion formed on one side facing the indoor space; and a second irradiator formed on the other side facing the photocatalyst, wherein the control unit includes the first irradiating part of the head so that the ultraviolet ray emitted from the ultraviolet lamp is emitted into the room when a human body is not detected by the sensor unit. is turned on, the second irradiator turns off, and when a human body is detected by the sensor unit, the first irradiator of the head part turns off, and the second irradiator turns off so that the ultraviolet ray emitted from the ultraviolet lamp is directed toward the photocatalyst part can

The driving unit may include: a left/right direction adjusting unit for adjusting a left/right direction of the head unit; may include

The photocatalyst unit may include: a housing fixed to an installation surface; a reflector provided on a surface of the housing facing the head, and formed of a photocatalytic material that decomposes pollutants by generating hydroxyl radicals by ultraviolet rays irradiated from the head; a suction unit formed around the reflecting plate of the housing and formed around the reflecting plate so that air near the reflecting plate is sucked into the housing; It may include a; provided in the housing, the fan for sucking the air toward the suction unit and then flowing the air to discharge.

The ultraviolet lamp may emit ultraviolet rays having a wavelength of 222 nm.

The head unit may further include a filter body that is provided on the front side of the ultraviolet lamp and selectively transmits only a wavelength of 200 to 230 nm.

A method of controlling a space sterilizing apparatus for controlling the aforementioned space sterilizing apparatus, the method comprising: a sensing step of confirming whether a movement of a human body is detected by a sensor unit; a direct sterilization step of directly sterilizing the indoor space by irradiating the indoor space with the ultraviolet rays of the head part when the movement of the human body is not detected in the sensing step; Indirect sterilization comprising; when the movement of the human body is sensed in the sensing step, an indirect sterilization step of directing the ultraviolet rays of the head to the photocatalyst so that ambient air is sterilized while passing through the photocatalyst and then circulated to the indoor space; A method of controlling an apparatus is disclosed.

The control unit, in the direct sterilization step, positions the head part in the first direction so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room, and in the indirect sterilization step, the ultraviolet rays emitted from the ultraviolet lamp are directed to the photocatalyst part The head unit may be rotated in the second direction to operate the fan of the photocatalyst unit.

Alternatively, according to another aspect of the present invention, in the direct sterilization step, the control unit turns on the first irradiation unit of the head unit so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room, the second irradiation unit turns off, and the indirect In the sterilization step, the first irradiation unit of the head unit may be turned off so that the ultraviolet rays emitted from the ultraviolet lamp are directed toward the photocatalyst unit, the second irradiation unit may be turned on, and a fan of the photocatalyst unit may be operated.

According to the space sterilization apparatus and the control method of the present invention, since the ultraviolet light irradiated from the head that emits ultraviolet light is excimer ultraviolet light of 222 nm, the harmfulness to the human body is minimized.

In addition, in order to prevent odors that may occur when UV light touches the skin of the human body or companion animals, the indirect sterilization stage is switched to the indirect sterilization stage when the movement of the human body or companion animal is detected indoors. Because sterilization is possible, there is an effect of preventing the spread of infectious diseases due to the sterilization blank period, and there is an effect of preventing the generation of odors due to ultraviolet light.

The effects of the present invention 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 description of the claims.

The summary set forth above as well as the detailed description of the preferred embodiments of the present application set forth below may be better understood when read in conjunction with the accompanying drawings. For the purpose of illustrating the invention, there are shown in the drawings preferred embodiments. It should be understood, however, that the present application is not limited to the precise arrangements and instrumentalities shown.
1 is a perspective view showing a space sterilization apparatus according to an embodiment of the present invention;
Fig. 2 is a longitudinal cross-sectional view of Fig. 1;
Fig. 3 is a transverse cross-sectional view of Fig. 1;
FIG. 4 is a longitudinal cross-sectional view showing when the space sterilization apparatus of FIG. 1 is in a direct sterilization step;
5 is a longitudinal cross-sectional view showing when the space sterilization apparatus of FIG. 1 is an indirect sterilization step;
6 is a perspective view showing a space sterilization device according to another embodiment of the present invention;
Fig. 7 is a longitudinal cross-sectional view of Fig. 6;
8 is a flowchart illustrating a control method of the space sterilization apparatus of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

The embodiments of the present invention are provided to more completely explain the present invention to those of ordinary skill in the art, and the embodiments described below may be modified in various other forms, The scope is not limited to the following examples. Rather, these examples are provided so as to more fully and complete the present invention, and to fully convey the spirit of the present invention to those skilled in the art.

The terminology used herein is used to describe specific embodiments, not to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly dictates otherwise. Also, as used herein, “comprise” and/or “comprising” refers to the presence of the recited shapes, numbers, steps, actions, members, elements, and/or groups of those specified. and does not exclude the presence or addition of one or more other shapes, numbers, movements, members, elements and/or groups. As used herein, the term “and/or” includes any one and any combination of one or more of those listed items.

Although the terms first, second, etc. are used herein to describe various elements, regions and/or regions, it is to be understood that these elements, parts, regions, layers, and/or regions are not limited by these terms. . These terms do not imply a specific order, upper and lower, or superiority, and are used only to distinguish one member, region or region from another member, region or region. Accordingly, a first member, region, or region described below may refer to a second member, region, or region without departing from the teachings of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings schematically illustrating embodiments of the present invention. In the drawings, variations of the illustrated shape may be expected, for example depending on manufacturing technology and/or tolerances. Therefore, the embodiment of the present invention should not be construed as limited to the specific shape of the region shown in this specification, but should include, for example, a change in shape caused by manufacturing.

As shown in FIGS. 1 and 2 , the space sterilization apparatus 100 according to the present embodiment has a head unit 120 , a driving unit 130 , a sensor unit 140 , a photocatalyst unit 150 and a control unit 160 . may include.

The head part 120 may be provided with an ultraviolet lamp 122 on one side. In this case, the ultraviolet lamp 122 may be an excimer ultraviolet lamp 122 emitting a single wavelength of 222 nm harmless to the human body. The excimer ultraviolet rays do not cause skin cancer 136 or retinal damage even when directly irradiated to the human body.

Alternatively, a filter body (not shown) that selectively transmits only a wavelength of 200 to 230 nm among the light emitted from the ultraviolet lamp may be provided on the front portion of the UV lamp 122 of the head unit 120 .

As the filter body, various filters such as a band-pass filter, a short-pass filter, a long-pass filter, or a notch filter that transmit only a wavelength of a specific region may be selected and applied or combined.

The driving unit 130 may adjust the UV irradiation direction of the UV head unit 120 . In the present embodiment, the driving unit 130 may include a left-right control unit 131 for adjusting the left-right direction of the head unit 120 and a vertical direction control unit 135 for adjusting the vertical tilt angle.

As shown in FIGS. 2 and 3 , the left-right direction adjustment unit 131 and the up-down direction adjustment unit 135 can adjust directions using motors 134 and 137 and gears.

To describe in more detail, a base 110 fixed to the installation surface is provided, the left-right direction adjustment unit 131 is provided on the base 110, and the left-right direction adjustment unit 131 has a vertical direction adjustment unit ( 135) is provided.

The left-right control unit 131 includes a first horizontal gear 132 and the first horizontal gear 132 coaxial with the rotation center axis of the housing 151 having a substantially circular cross section coupled to the base 110 . A second horizontal gear 133 which is meshed with and rotated by the motor 134 may be provided.

The vertical direction control unit 135 includes an arm 136 that extends downward from the side of the left and right direction control unit 131 to rotate around the left and right direction control unit 131 , A motor that meshes with the first horizontal gear 132 of the left and right control unit 131 may be provided on the arm 136 . In addition, the head unit 120 may be tiltably coupled to the arm 136 in the vertical direction.

At this time, the first horizontal gear 132 is fixed to the housing 151 and the arm 136 and the head unit 120 are rotated according to the rotation of the motor.

In addition, the vertical direction adjustment unit 135 may be provided such that the head unit 120 is tilted by being rotated in the vertical direction according to the motor 137 and the motor 137 provided in the arm 136 .

At this time, the motor 134 of the left and right direction adjustment unit 131 and the motor 137 of the vertical direction adjustment unit 135 may be one or may be provided separately.

Accordingly, the left and right angles of the head unit 120 are adjusted by the rotation of the left and right adjustment unit 131 , and the vertical tilting angle of the head unit 120 is adjusted as the vertical direction adjustment unit 135 rotates. can be adjusted.

Meanwhile, the photocatalyst unit may be provided in the housing 151 , and may include a reflecting plate 153 , a suction unit 155 , and a fan 157 .

The reflective plate 153 is formed on the lower side of the housing 151 facing the head part 120 , and a photocatalytic material that generates hydroxyl radicals in the ultraviolet rays irradiated from the head part 120 to decompose contaminants. can be formed with The photocatalytic material may be titanium oxide (TiO2). In addition, the photocatalytic material is zinc oxide (ZnO), tin oxide (SnO2), tungsten oxide (WO3), tungsten oxide-titanium dioxide (WO3-TiO2), zinc sulfide (ZnS), nickel oxide (NiO) in addition to the titanium oxide. and various materials such as iron oxide (Fe2O3).

In addition, the reflective plate 153 may have a central portion convexly protruding downward, and an edge portion may be obliquely inclined toward the inner side of the housing 151 .

In addition, the suction part 155 is formed such that a portion corresponding to the circumference of the reflection plate 153 of the housing 151 is spaced apart from the edge of the reflection plate 153, so that the air near the reflection plate 153 is absorbed into the housing ( 151) may be formed to be sucked into the interior.

In addition, a fan 157 is provided inside the housing 151 to flow the air to discharge the air sucked into the suction unit 155 to the outside of the housing 151 . In addition, a plurality of outlets 159 for discharging the sucked air may be formed around the side surface of the housing 151 .

Accordingly, the indoor air is introduced into the housing 151 through the suction unit 155 by the fan 157 and then discharged. When irradiated, viruses or bacteria in the air introduced into the suction unit 155 are sterilized by ultraviolet rays, or bacteria and viruses are destroyed by ozone generated by the ultraviolet rays, and harmful substances can be purified. In addition, hydroxide radicals (OH) are generated on the surface of the reflection plate by the ultraviolet rays irradiated to the reflection plate 153, and the generated hydroxide radicals are very strong oxidizing agents, which can sterilize and decompose various kinds of organic compounds.

In addition, the housing 151 or the arm 136 may be provided with a sensor unit 140 for detecting the movement of a person or a companion animal in the space.

On the other hand, the control unit 160 controls the head unit 120 , the driving unit 130 , and the sensor unit 140 , and determines whether the movement of the human body or companion animal detected by the sensor unit 140 is detected. Accordingly, it is possible to control whether the ultraviolet rays irradiated from the head unit 120 are directed to the indoor space or to the photocatalyst unit 150 .

That is, when the sensor unit 140 does not detect a human body, as shown in FIG. 4 , the head unit 120 is positioned in the first direction so that the ultraviolet light emitted from the ultraviolet lamp 122 is emitted into the room. The head unit directly sterilizes the indoor space, and when a human body is detected by the sensor unit 140 , the UV light emitted from the UV lamp 122 is directed toward the photocatalyst unit 150 as shown in FIG. 5 . By rotating 120 in the second direction, it is possible to indirectly sterilize the air in the indoor space.

Hereinafter, a space sterilization apparatus 200 according to another embodiment of the present invention will be described.

As shown in FIGS. 6 and 7 , the space sterilization apparatus 200 according to the present embodiment includes a head unit 220 , a driving unit 230 , a sensor unit 240 , a photocatalyst unit 250 and a control unit 260 . may include.

The sensor unit 240 and the photocatalyst unit 250 are the same as in the above-described embodiment, and a detailed description thereof will be omitted.

The head unit 220 may include a first irradiation unit 222 and a second irradiation unit 224 .

The first irradiating part 222 is formed on one side of the ultraviolet lamp irradiating ultraviolet ray toward the indoor space, and the second irradiating part 224 is formed on the other side of the ultraviolet ray lamp irradiating ultraviolet ray facing the photocatalyst 250 . can be

In addition, the driving unit 230 may include a left-right direction adjustment unit 231 for adjusting the left-right direction of the head unit 220 .

That is, the vertical tilt angle of the head unit 220 is fixed, and the left and right directions can be adjusted by the left and right direction adjusting unit 231 .

On the other hand, the control unit 260, when the movement of the human body or companion animal is not detected by the sensor unit 240, the first irradiation unit of the head unit 220 so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room. (222) is turned on to directly sterilize the indoor space, the second irradiation unit 224 is turned off, and when a movement of a human body or companion animal is detected by the sensor unit 240, ultraviolet rays emitted from the ultraviolet lamp are emitted from the photocatalyst unit. The first irradiation unit 222 of the head unit 220 may be turned off to face 250 and the second irradiation unit 224 may be turned on to control indirect sterilization of the indoor space.

Hereinafter, an embodiment of the control method of the space sterilization apparatus of the present invention will be described.

First, the control method of the space sterilization apparatus according to the present embodiment may include a regular lighting step (S110), a time control step (S120), and a sensor detection step (S130).

The always-on step ( S110 ) is a step of constantly sterilizing the indoor space by operating the UV lamp of the head part at all times while power is applied to the product.

In addition, the time control step ( S120 ) is a step in which the UV lamp of the head unit is turned on/off according to the operating time set in the control unit.

The sensor detecting step (S130) may include a detecting step (S132), a direct sterilization step (S134), and an indirect sterilization step (S136).

That is, when power is applied, the sensor unit is operated to check whether the movement of the human body or companion animal is detected in the indoor space.

The direct sterilization step (S134) is a step of directly sterilizing the indoor space by allowing the UV rays of the head to irradiate the indoor space when the movement of the human body or companion animal is not detected in the detecting step (S132).

In addition, in the indirect sterilization step (S136), when the movement of the human body or companion animal is detected in the detection step (S132), the ultraviolet rays of the head part are directed to the photocatalyst part so that the surrounding air passes through the photocatalyst part and sterilization is performed. It is a step of indirectly sterilizing the air in the indoor space by allowing it to circulate to the indoor space.

This sensor detection step (S130) is integrated with the time control step (S120) so that the UV lamp is not operated outside of a set operating time, and the UV lamp can be operated within a set operating time.

On the other hand, when the space sterilization apparatus 100 has the structure of the above-described embodiment, in the direct sterilization step (S134), the control unit controls the head unit 120 so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room. positioned in the first direction, and in the indirect sterilization step (S136), the head unit 120 is rotated in the second direction so that the ultraviolet rays emitted from the ultraviolet lamp are directed toward the photocatalyst unit 150, and the photocatalyst unit The fan 157 of 150 may be operated.

Alternatively, when the space sterilization device 200 has the structure of the other embodiment described above, in the direct sterilization step (S134), the head unit 220 so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room. The first irradiator 222 of The first irradiation unit 222 of 220 may be turned off, the second irradiation unit 224 may be turned on, and the fan 259 of the photocatalyst unit 250 may be operated.

Of course, even in the direct sterilization step (S134), the second irradiation unit 224 and the fan 259 may be operated.

As described above, preferred embodiments according to the present invention have been reviewed, and the fact that the present invention can be embodied in other specific forms without departing from the spirit or scope of the present invention in addition to the above-described embodiments is one of ordinary skill in the art. It is obvious to them. Therefore, the above-described embodiments are to be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description, but may be modified within the scope of the appended claims and their equivalents.

100 space sterilizer 110 base
120 Head 122 UV Lamp
130 drive unit 131 left/right control unit
132 1st horizontal gear 133 2nd horizontal gear
134 Motor 135 Up/Down Control
136 female 137 motor
140 Sensor 150 Photocatalyst
151 housing 153 reflector
155 Suction 157 Fan
159 outlet 160 control unit

Claims (11)

a head unit equipped with an ultraviolet lamp;
a driving unit for controlling the UV irradiation direction of the head unit;
a sensor unit for detecting whether a person is present in the area to which the ultraviolet lamp is irradiated;
a photocatalyst unit for decomposing substances attached to the surface by generating hydroxyl radicals by ultraviolet rays irradiated from the head unit;
a control unit for controlling whether the ultraviolet rays irradiated from the head unit are directed to an indoor space or to the photocatalyst unit according to the presence or absence of a human body detected by the sensor unit;
includes,
The control unit is
When a human body is not detected by the sensor unit, ultraviolet rays emitted from the head unit irradiate the indoor space to directly sterilize the indoor space,
A space sterilization apparatus for indirectly sterilizing an indoor space by directing the ultraviolet rays emitted from the head to the photocatalyst when a human body is detected by the sensor unit to circulate the ambient air through the photocatalyst and then circulate to the indoor space after sterilization. According to claim 1,
The head part is provided with an ultraviolet lamp on one side,
The control unit is
When a human body is not detected by the sensor unit, the head unit is positioned in the first direction so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room,
When a human body is detected by the sensor unit, the space sterilization apparatus rotates the head unit in a second direction so that the ultraviolet light emitted from the UV lamp is directed toward the photocatalyst unit. 3. The method of claim 2,
The driving unit,
a left-right control unit for adjusting the left-right direction of the head part;
a vertical direction adjusting unit for adjusting the vertical tilting angle of the head part;
Including, space sterilizer. According to claim 1,
The head part,
a first irradiation unit formed on one side facing the indoor space;
a second irradiation unit formed on the other side facing the photocatalyst;
includes,
The control unit is
When a human body is not detected by the sensor unit, the first irradiation unit of the head unit is turned on so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room, and the second irradiation unit is turned off,
When a human body is detected by the sensor unit, the first irradiator of the head unit turns off and the second irradiator turns on so that the ultraviolet rays emitted from the ultraviolet lamp are directed toward the photocatalyst. 5. The method of claim 4,
The driving unit,
a left-right control unit for adjusting the left-right direction of the head part; Including, space sterilizer. According to claim 1,
The photocatalyst unit,
a housing fixed to the mounting surface;
a reflector provided on a surface of the housing facing the head, and formed of a photocatalytic material that decomposes pollutants by generating hydroxyl radicals by ultraviolet rays irradiated from the head;
a suction unit formed around the reflecting plate of the housing and formed around the reflecting plate so that air near the reflecting plate is sucked into the housing;
a fan provided inside the housing, the fan sucking air toward the suction unit and flowing the air to discharge it;
Including, space sterilizer. According to claim 1,
The ultraviolet lamp is a space sterilization device that emits ultraviolet rays of a wavelength of 222 nm. According to claim 1,
The head part,
The space sterilization apparatus further comprising a filter body provided on the front part of the ultraviolet lamp to selectively transmit only wavelengths in the range of 200 to 230 nm. In the control method of the space sterilization apparatus for controlling the space sterilization apparatus according to any one of claims 1 to 8,
A sensing step of confirming whether the motion of the human body is detected by the sensor unit;
a direct sterilization step of directly sterilizing the indoor space by irradiating the indoor space with the ultraviolet rays of the head part when the movement of the human body is not detected in the sensing step;
When the movement of the human body is sensed in the sensing step, the ultraviolet ray is directed to the photocatalyst that decomposes the pollutants by generating hydroxyl radicals by the ultraviolet rays irradiated to the head, and the ambient air passes through the photocatalyst after sterilization is performed. Indirect sterilization step to circulate to the indoor space;
Including, a control method of a space sterilization device. 10. The method of claim 9,
The control unit is
In the direct sterilization step, the head portion is positioned in the first direction so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room,
In the indirect sterilization step, the head unit is rotated in a second direction so that the ultraviolet rays emitted from the ultraviolet lamp are directed to the photocatalyst unit, and the fan of the photocatalyst unit is operated. 10. The method of claim 9,
The control unit is
In the direct sterilization step, the first irradiation part of the head part is turned on so that the ultraviolet rays emitted from the ultraviolet lamp are emitted into the room, and the second irradiation part is turned off,
In the indirect sterilization step, the first irradiation part of the head part is turned off so that the ultraviolet rays emitted from the ultraviolet lamp are directed to the photocatalyst part, the second irradiation part is turned on, and the fan of the photocatalyst part is operated. .

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