Air purifier

Abstract

This air purifier comprises: a frame; a filter; a fan unit; an opening / closing unit, which can move with respect to the frame so as to be placed in a first opening state in which an outlet is opened, a second opening state in which a part of the outlet is opened so that an open area of the outlet is formed to be smaller than that in the first opening state, or a closing state in which the outlet is closed; a driving unit providing driving force for moving the opening / closing unit; and a controller for controlling the driving unit and the fan unit such that the opening / closing unit is placed in any one of the first opening state, the second opening state and the closing state, wherein the controller can control the fan unit such that the rotational speed of the fan unit is reduced when the driving unit is driven so that the opening / closing unit is placed in any one of the first opening state, the second opening state, and the closing state.

Description

air purifier

[0001] The present invention relates to an air purifier.

[0002] Typically, an air purifier is a device that purifies polluted air, replacing it with fresh air. It does this by passing the incoming air through an air purification filter, eliminating dust, bacteria, and odors. These air purifiers typically include a housing with outlets formed on the front and top surfaces, a blower fan positioned within the housing to draw in air, an air purification filter that purifies the air, and an opening / closing mechanism for opening and closing the outlets.

[0003] In relation to such an opening and closing means, the applicant's Korean Patent Publication No. 10-2018-0046070 entitled "Air Purifier" (Patent Document 1) discloses an air purifier including a housing having a first air discharge port through which air is discharged, a blower fan for drawing outside air into the interior of the housing and flowing it to the first air discharge port, and an opening and closing member that rotates with respect to the housing for opening and closing the first air discharge port.

[0004] However, the air purifier of Patent Document 1 has a problem in that noise may be generated by air discharged from the first air outlet when the opening / closing member rotates to open / close the first air outlet. In other words, although the opening area of ​​the first air outlet changes by the rotation of the opening / closing member of the air purifier of Patent Document 1, the blowing force of the blower remains the same regardless of whether the opening / closing member rotates, so there is a problem in that noise may be generated by air passing through the first air outlet.

[0005] One embodiment of the present invention provides an air purifier capable of reducing noise when an opening / closing unit of the air purifier is moved.

[0006] An air purifier according to one aspect of the present invention comprises: a frame having an inlet for introducing external air and an outlet for discharging the air; a filter disposed inside the frame for filtering air; a fan unit for providing a blowing force so that air is introduced into the frame through the inlet and air filtered by the filter is discharged through the outlet; an opening / closing unit movable with respect to the frame so as to be in a first open state in which the outlet is opened, a second open state in which a portion of the outlet is opened so that an open area of ​​the outlet is formed smaller than when the outlet is in the first open state, or a closed state in which the outlet is closed; a driving unit for providing a driving force for moving the opening / closing unit; And the opening / closing unit includes a controller that controls the driving unit and the fan unit so that the opening / closing unit is placed in any one of the first open state, the second open state, and the closed state, and the controller can control the fan unit so that the rotation speed of the fan unit is reduced when the driving unit is driven so that the opening / closing unit is placed in any one of the first open state, the second open state, and the closed state.

[0007] In addition, the controller controls the driving unit based on a plurality of movement modes so that the opening / closing unit is placed in one of the first open state, the second open state, and the closed state, and the plurality of movement modes include an initial movement mode for controlling the driving unit for an initial operation time from a time point when movement of the opening / closing unit is initiated; and a main movement mode for controlling the driving unit after the initial operation time has elapsed, and the controller can control the driving unit so that the driving unit rotates at an initial rotation speed when in the initial movement mode, and control the driving unit so that the driving unit rotates at a main rotation speed greater than the initial rotation speed when in the main movement mode.

[0008] Additionally, the controller can control the fan unit so that the rotation speed of the fan unit is reduced to a preset reduction speed when in the initial movement mode.

[0009] Additionally, the controller can control the fan unit so that the rotation speed of the fan unit maintains the reduction speed when in the main movement mode.

[0010] Additionally, the air purifier may further include a sensor unit including a single sensor that detects the opening / closing unit when it is in the first open state and the closed state.

[0011] In addition, the plurality of movement modes further include a confirmation movement mode for controlling the driving unit when the opening / closing unit is detected by the sensor unit, and the controller can, when in the confirmation movement mode, stop the driving unit so that the movement of the opening / closing unit is stopped, and then re-rotate the driving unit in the same direction as the direction in which the driving unit was rotated in the main movement mode.

[0012] Additionally, the controller can control the fan unit so that, when in the confirmation movement mode, the rotation speed of the fan unit increases and is restored to the rotation speed before the decrease.

[0013] In addition, the frame further has an outlet formed therein for discharging air in a direction different from the outlet, and the opening / closing unit can cause air to flow through the outlet when in the closed state, cause less air to flow through the outlet when in the second open state than when in the closed state, and close the outlet when in the first open state.

[0014] In one embodiment of the present invention, when the driving unit is driven to move the opening / closing unit of the air purifier to open or close the exhaust port, the rotation speed of the fan unit is reduced, so that the amount of air discharged from the exhaust port can be reduced, and thus noise generated by the air discharged from the exhaust port can be reduced.

[0015] In addition, when the drive unit is driven, the rotation speed of the fan unit can be reduced, thereby preventing the opening / closing unit from vibrating due to air discharged from the exhaust port.

[0016] In addition, when starting the drive unit, the drive unit can be driven at a low rotational speed, thereby preventing the rotor of the motor from losing its position.

[0017] Figure 1 is a perspective view of an air purifier according to one embodiment of the present invention.

[0018] Fig. 2 is a cross-sectional view of the air purifier taken along line II-II when the opening / closing unit of the air purifier of Fig. 1 is in the first open state.

[0019] Fig. 3 is a cross-sectional view showing the opening / closing unit of the air purifier of Fig. 1 in a second open state.

[0020] Fig. 4 is a cross-sectional view showing the opening / closing unit of the air purifier of Fig. 1 in a closed state.

[0021] Hereinafter, specific embodiments for implementing the technical idea of ​​the present invention will be described in detail with reference to the drawings.

[0022] In addition, when explaining the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0023] Additionally, when it is said that a component is 'connected' or 'flows' to another component, it should be understood that it may be directly connected or flowed to that other component, but there may also be other components in between.

[0024] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0025] Additionally, please note that the terms "upper side," "lower side," and "side" in this specification are based on the illustrations in the drawings and may be expressed differently if the orientation of the subject changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the sizes of each component do not fully reflect the actual size.

[0026] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0027] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0028] Hereinafter, an air purifier (1) according to one embodiment of the present invention will be described with reference to the drawings.

[0029] Referring to FIGS. 1 and 2, an air purifier (1) according to one embodiment of the present invention can purify polluted air into clean air by filtering dust, odor particles, etc. of air drawn into the interior. The air purifier (1) can suck in outside air into the interior and discharge clean air purified inside to the exterior. The air purifier (1) may include a frame (100), a fan unit (200), a filter (300), a sensor unit (400), a driving unit (500), an opening / closing unit (600), and a controller (700).

[0030] The frame (100) accommodates a fan unit (200), a filter (300), a sensor unit (400), a driving unit (500), and an opening / closing unit (600), and can form the exterior of the air purifier (1). In addition, the frame (100) may be formed with an inlet (110) for introducing external air, an outlet (120) for discharging air, and an outlet (130) for discharging air in a direction different from the outlet (120). For example, the inlet (110) and the outlet (130) may be formed on the front surface of the frame (100), and the outlet (120) may be formed on the upper surface of the frame (100), but is not limited thereto, and the inlet (110), the outlet (120), and the outlet (130) may be formed on different surfaces of the frame (100).

[0031] The fan unit (200) can provide a blowing force so that external air can be introduced into the internal space of the frame (100) through the inlet (110). The air introduced into the internal space by the blowing force of the fan unit (200) can be filtered by the filter (300) and then guided by the inner surface of the frame (100) to flow toward the outlet (120) or the discharge port (130). In addition, the fan unit (200) can be placed lower than the opening / closing unit (600).

[0032] The filter (300) can filter the air introduced into the internal space of the frame (100). For example, the filter (300) may be a HEPA filter. This filter (300) may be placed between the inlet (110) and the fan unit (200).

[0033] Referring further to FIGS. 3 and 4, the sensor unit (400) can detect the opening / closing unit (600) when the opening / closing unit (600) is in the first open state and the closed state, which will be described later. In addition, the sensor unit (400) can not detect the opening / closing unit (600) when the opening / closing unit (600) is in the second open state, which will be described later. The sensor unit (400) can include a sensor (410) and a plurality of magnetic materials (420).

[0034] The sensor (410) may be placed inside the frame (100). In other words, the sensor (410) may be supported by the frame (100) so as to be placed between the outlet (120) and the flow member (620) inside the frame (100). One such sensor (410) may be provided. In addition, the sensor (410) may detect the opening / closing unit (600) by detecting any one of a plurality of magnetic bodies (420).

[0035] A plurality of magnetic bodies (420) may be arranged on the opening / closing member (610) so as to be spaced apart from each other in the front-back direction. In other words, the plurality of magnetic bodies (420) may be moved together with the opening / closing member (610). One of the plurality of magnetic bodies (420) may be arranged on the rear side of the opening / closing member (610), and another of the plurality of magnetic bodies (420) may be arranged on the front side of the opening / closing member (610). One of the plurality of magnetic bodies (420) may be detected by the sensor (410) when the opening / closing unit (600) is placed in the first open state. In other words, one of the plurality of magnetic bodies (420) may be arranged to face the sensor (410) when the opening / closing member (610) is moved forward so that the opening / closing unit (600) is placed in the first open state. In addition, another one of the plurality of magnetic bodies (420) may be detected by the sensor (410) when the opening / closing unit (600) is placed in the closed state. In other words, another one of the plurality of magnetic bodies (420) may be arranged to face the sensor (410) when the opening / closing member (610) is moved rearward so that the opening / closing unit (600) is placed in the closed state. In addition, the plurality of magnetic bodies (420) may not be detected by the sensor (410) when the opening / closing unit (600) is placed in the second open state. In other words, the sensor (410) may be positioned between the plurality of magnetic bodies (420) when the opening / closing unit (600) is placed in the second open state.

[0036] The driving unit (500) can provide a driving force to move the opening / closing unit (600). The driving unit (500) can be rotated around a rotation axis extending in the left / right direction and can be placed between the opening / closing member (610) and the flow path member (620). By rotating, the driving unit (500) can move the opening / closing member (610) and the flow path member (620) in different directions. In other words, when the driving unit (500) is rotated in one direction (counterclockwise in FIG. 2), the opening / closing member (610) can be moved forward, and the flow path member (620) can be moved rearward. In addition, when the driving unit (500) is rotated in the other direction (clockwise in FIG. 2), which is the opposite direction to one direction, the opening / closing member (610) can be moved rearward, and the flow path member (620) can be moved forward. This driving unit (500) may include a motor (510) and a gear unit (520).

[0037] The motor (510) can provide driving force to move the opening / closing unit (600). This motor (510) can be supported on the frame (100). For example, the motor (510) can be supported on the frame (100) so as to be positioned between the directional member (620) and the opening / closing member (610).

[0038] The gear unit (520) can be engaged with the opening / closing unit (600) and rotated around the rotation axis by the driving force of the motor (510), thereby moving the opening / closing unit (600). The gear unit (520) can be engaged with the opening / closing member (610) and the flow path member (620) simultaneously. In other words, the gear unit (520) can be rotated between the opening / closing member (610) and the flow path member (620). When the gear unit (520) is rotated, the flow path member (620) and the opening / closing member (610) can move in different directions.

[0039] The opening / closing unit (600) is movably arranged within the frame (100) and can open / close at least one of the discharge port (120) and the outlet port (130). In other words, the opening / closing unit (600) is moved by the driving unit (500) and can be placed in any one of the first open state, the second open state, and the closed state.

[0040] The first open state is a state in which the opening / closing unit (600) opens the discharge port (120) and closes the discharge port (130). In other words, when the opening / closing unit (600) is in the first open state, filtered air can only be discharged through the discharge port (120) and is not discharged from the discharge port (130).

[0041] The second open state may be a state in which a portion of the exhaust port (120) is opened and the exhaust port (130) is opened so that the open area of ​​the exhaust port (120) is formed smaller than when the opening / closing unit (600) is in the first open state. In other words, when the opening / closing unit (600) is in the closed state, air can flow to the exhaust port (120) and the exhaust port (130). When the opening / closing unit (600) is in the second open state, filtered air can be discharged from the exhaust port (120) and the exhaust port (130). The open area of ​​the exhaust port (120) may mean an area not covered by the opening / closing member (610) described below when viewed in the vertical direction.

[0042] The closed state may be a state in which the opening / closing unit (600) closes the discharge port (120) and opens the discharge port (130). In other words, when the opening / closing unit (600) is in the closed state, filtered air can only be discharged from the discharge port (130). In addition, when in the closed state, the opening / closing unit (600) can allow more air to flow to the discharge port (130) than when in the second open state.

[0043] This opening / closing unit (600) may include an opening / closing member (610) and a euro member (620).

[0044] The opening / closing member (610) is movably supported on the frame (100) and can open / close the discharge port (120). In other words, the opening / closing member (610) can open the discharge port (120) when the opening / closing unit (600) is in a first open state, can open a portion of the discharge port (120) when the opening / closing unit (600) is in a second open state, and can close the discharge port (120) when the opening / closing unit (600) is in a closed state. This opening / closing member (610) can be reciprocated in the front / rear direction within the frame (100) by the driving unit (500). For example, the opening / closing member (610) may be positioned below the exhaust port (120) and moved forward toward the side where air is discharged to the exhaust port (130) to open the exhaust port (120), or moved rearward toward the opposite side of the front to close the exhaust port (120). When the opening / closing unit (600) is moved to be in either the second open state or the closed state, the opening / closing member (610) may be moved rearward, thereby reducing the open area of ​​the exhaust port (120). In addition, when the opening / closing unit (600) is moved to be in the first open state or the second open state, the opening / closing member (610) may be moved forward, thereby increasing the open area of ​​the exhaust port (120).

[0045] The flow path member (620) is movably supported on the frame (100) and can open and close the outlet (130). The flow path member (620) can be moved in the opposite direction to the opening and closing member (610). In addition, the flow path member (620) can be reciprocated in the forward and backward direction inside the frame (100) by the driving unit (500). The flow path member (620) can provide a passage so that the filtered air is guided toward the outlet (130). When the flow path member (620) is moved forward, the rear end of the flow path member (620) is spaced apart from the inside of the frame (100), so that the passage of the flow path member (620) and the inside of the frame (100) can be communicated. In other words, when the opening / closing unit (600) is placed in either the second open state or the closed state, the flow path member (620) is spaced apart from the inside of the frame (100), so that the filtered air flowing inside the frame (100) can flow to the outlet (130) through the internal passage of the flow path member (620). In addition, when the flow path member (620) moves rearward, the rear end of the flow path member (620) may come into contact with the inside of the frame (100), so that the passage of the flow path member (620) and the inside of the frame (100) may be blocked. In other words, when the opening / closing unit (600) is placed in the first open state, and the flow path member (620) moves rearward and comes into contact with the inside of the frame (100), the filtered air flowing inside the frame (100) can be blocked from flowing into the inside of the flow path member (620). In addition, the directional member (620) may be formed so that the movement distance when the opening / closing unit (600) moves from the first open state to the closed state is smaller than the movement distance of the opening / closing member (610). In other words, when the opening / closing unit (600) is in the first open state, the directional member (620) may close the outlet (130) by blocking air from flowing into the interior by having the rear end contact the rear surface of the frame (100).In addition, when the opening / closing unit (600) is in the second open state, the rear end of the flow member (620) is spaced apart from the rear of the frame (100) by a predetermined first distance, so that air can flow into the interior and outward toward the discharge port (130). In addition, when the opening / closing unit (400) is in the closed state, the rear end of the flow member (620) is spaced apart from the rear of the frame (100) by a second distance greater than the first distance, so that air drawn into the interior can flow toward the discharge port (130). The amount of air flowing into the flow member (620) may be greater when the opening / closing unit (600) is in the closed state than when it is in the second open state.

[0046] The controller (700) can control the fan unit (200) and the drive unit (500). The controller (800) can control the operation of the drive unit (500) so that the opening / closing unit (600) is placed in any one of the first open state, the second open state, and the closed state. When the controller (700) drives the drive unit (500) so that the opening / closing unit (600) is placed in any one of the first open state, the second open state, and the closed state, the controller (700) can control the fan unit (200) so that the rotation speed of the fan unit (200) is reduced. In other words, when the drive unit (500) starts to rotate from a stopped state, the controller (700) can reduce the rotation speed of the fan unit (200) to a preset reduction speed.

[0047] In addition, the controller (700) can control the operation of the drive unit (500) based on a plurality of movement modes so that the opening / closing unit (600) is placed in any one of the first open state, the second open state, and the closed state. The plurality of movement modes can include an initial movement mode, a main movement mode, and a confirmation movement mode, and the movement speed of the opening / closing unit (600) is controlled based on each movement mode, but each movement mode does not determine the movement direction of the opening / closing unit (600). In other words, the controller (700) can control the drive unit (500) and the fan unit (200) based on the initial movement mode, the main movement mode, and the confirmation movement mode so that the opening / closing unit (600) is placed in any one of the first open state, the second open state, and the closed state. The initial movement mode, the main movement mode, and the confirmation movement mode can be sequentially performed.

[0048] The initial movement mode is a mode in which the drive unit (500) is controlled during the initial operation time, which is the time from the time when the movement of the opening / closing unit (600) is initiated until a predetermined time has elapsed. The initial operation time may be set differently according to a plurality of states. For example, a first initial operation time, a second initial operation time, and a third initial operation time may be set corresponding to a first open state, a second open state, and a closed state, respectively. The controller (700) may control the drive unit (500) so that the drive unit (500) rotates at a predetermined initial rotation speed when in the initial movement mode. In other words, the controller (700) may rotate the drive unit (500) at the initial rotation speed during the initial operation time, thereby moving the opening / closing unit (600) so that the opening / closing unit (600) is placed in one of the first open state, the second open state, and the closed state. For example, the initial rotation speed may be the rotation speed when the motor rotates at 200 pps (pulse per second). In addition, the controller (700) may control the fan unit (200) so that the rotation speed of the fan unit (200) is reduced to a predetermined rotation speed, which is a reduction speed, when in the initial movement mode. When the rotation speed of the fan unit (200) is reduced in the initial movement mode, the air flowing into the interior of the frame (100) and the filtered air discharged to the outside of the frame (100) through at least one of the outlet (120) and the discharge outlet (130) may also be reduced.

[0049] For example, in the first open state, in the initial movement mode, the opening / closing unit (600) can rotate the driving unit (500) forward so as to move forward during the first initial operation time. In addition, in the second open state, in the initial movement mode, the opening / closing unit (600) can rotate the driving unit (500) forward or backward so as to move forward or backward during the second initial operation time. In addition, in the closed state, in the initial movement mode, the opening / closing unit (600) can rotate the driving unit (500) backward so as to move forward during the third initial operation time. The main movement mode is a mode in which the driving unit (500) is controlled after the initial operation time has elapsed. In other words, the main movement mode is a mode performed after the initial movement mode. The controller (700) can control the driving unit (500) to rotate at a main rotation speed greater than the initial rotation speed when in the main movement mode. For example, the large main rotation speed can be the rotation speed when the motor (430) rotates at 500 pps. In addition, the controller (700) can control the rotation speed of the fan unit (200) to maintain a predetermined rotation speed, which is a reduction speed, when in the main movement mode. In addition, the direction of the driving unit (500) in the initial movement mode can be maintained in the main movement mode.

[0050] The confirmation movement mode is a mode in which the operation of the driving unit (500) is controlled when the opening / closing unit (600) is detected by the sensor unit (400). This confirmation movement mode can be performed when the opening / closing unit (600) is placed in the first open state or the closed state. In other words, the confirmation movement mode can be a mode for confirming whether the opening / closing unit (600) is correctly positioned in the first open state or the closed state. The controller (700) can stop the driving unit (500) so that the movement of the opening / closing unit (600) is stopped when in the confirmation movement mode. In addition, after stopping the driving unit (500) in the confirmation movement mode, the controller (700) can re-rotate the driving unit (500) in the same direction in which the driving unit (500) rotated in the main movement mode. For example, if the drive unit (500) has been rotated in one direction in the main movement mode, the controller (700) can rotate the drive unit (500) in one direction again in the confirmation movement mode. In addition, if the drive unit (500) has been rotated in the other direction opposite to one direction in the main movement mode, the controller (700) can rotate the drive unit (500) in the other direction again in the confirmation movement mode.

[0051] In addition, when the controller (700) is in the confirmation movement mode, if the driving unit (500) is stopped, the rotation speed of the fan unit (200) can be increased so that the rotation speed of the fan unit (200) is restored to the rotation speed before the rotation speed of the fan unit (200) was adjusted to decrease. In other words, the controller (700) can control the rotation speed of the fan unit (200) that was decreased in the initial movement mode to become the rotation speed before the initial movement mode. Since the rotation of the fan unit (200) can be increased in this initial movement mode, the amount of filtered air discharged to the outside from at least one of the outlet (120) and the discharge outlet (130) can be increased.

[0052] Hereinafter, the operation and effect of an air purifier (1) according to one embodiment of the present invention will be described.

[0053] In an air purifier (1) according to one embodiment of the present invention, when the driving unit (500) is driven, the rotation speed of the fan unit (200) can be reduced, thereby preventing the opening / closing unit (400) from vibrating due to air discharged from the exhaust port (120).

[0054] In addition, when the opening / closing unit (400) of the air purifier (1) moves to open or close the exhaust port (120), the rotation speed of the fan unit (200) is reduced, so that the amount of air discharged from the exhaust port (120) can be reduced, and thus noise generated by the air discharged from the exhaust port (120) can be reduced.

[0055] In addition, when the driving unit (500) is started, the driving unit (500) can be driven at a low rotational speed, thereby preventing the rotor of the motor (320) from being out of sync. In other words, since the driving unit (500) can be rotated at the initial rotational speed, the motor (320) can be driven stably in the initial movement mode.

[0056] Although specific embodiments of the present invention have been described, these are merely examples, and the present invention is not limited thereto, but should be construed to have the broadest scope consistent with the technical concepts disclosed herein. Those skilled in the art may combine / substitute the disclosed embodiments to implement patterns of shapes not specified, but this also does not depart from the scope of the present invention. In addition, those skilled in the art may easily modify or alter the disclosed embodiments based on the present specification, and it is clear that such modifications and alterations also fall within the scope of the present invention.

Claims

1. A frame having an inlet for external air to flow in and an outlet for discharging the air; A filter placed inside the frame to filter air; A fan unit that provides blowing force so that air is drawn into the frame through the inlet and air filtered by the filter is discharged through the outlet; An opening / closing unit movable with respect to the frame so as to be in a first open state in which the outlet is opened, a second open state in which a portion of the outlet is opened so that the open area of ​​the outlet is formed smaller than when the outlet is in the first open state, or a closed state in which the outlet is closed; A driving unit that provides a driving force to move the above opening / closing unit; and The opening / closing unit includes a controller that controls the driving unit and the fan unit so that the opening / closing unit is in one of the first open state, the second open state, and the closed state, The above controller, When the driving unit is driven so that the opening / closing unit is placed in one of the first open state, the second open state, and the closed state, the fan unit is controlled so that the rotation speed of the fan unit is reduced. Air purifier.

2. In paragraph 1, The above controller, Controlling the driving unit based on a plurality of movement modes so that the opening / closing unit is placed in one of the first open state, the second open state, and the closed state, The above multiple movement modes are: An initial movement mode that controls the driving unit during an initial operation time from the time when the movement of the opening / closing unit is initiated; and a main movement mode that controls the driving unit after the initial operation time has elapsed. The above controller, When in the initial movement mode, the driving unit is controlled so that the driving unit rotates at the initial rotation speed, and when in the main movement mode, the driving unit is controlled so that the driving unit rotates at the main rotation speed greater than the initial rotation speed. Air purifier.

3. In paragraph 2, The above controller, When in the initial movement mode, the fan unit is controlled so that the rotation speed of the fan unit is reduced to a preset reduction speed. Air purifier.

4. In paragraph 3, The above controller, When in the above main movement mode, the fan unit is controlled so that the rotation speed of the fan unit maintains the reduction speed. Air purifier.

5. In paragraph 2, Further comprising a sensor unit including a single sensor that detects the opening / closing unit when placed in the first open state and the closed state. Air purifier.

6. In paragraph 5, The above multiple movement modes are: When the above opening / closing unit is detected by the above sensor unit, a confirmation movement mode for controlling the above driving unit is further included. The above controller, When in the above confirmation movement mode, after stopping the driving unit so that the movement of the opening / closing unit stops, the driving unit is rotated again in the same direction as the direction in which the driving unit was rotated in the main movement mode. Air purifier.

7. In paragraph 6, The above controller, When in the above confirmation movement mode, the fan unit is controlled so that the rotation speed of the fan unit increases and is restored to the rotation speed before the decrease. Air purifier.

8. In paragraph 1, In the above frame, an outlet is further formed to discharge air in a direction different from the outlet, The above opening / closing unit, when in the closed state, allows air to flow through the outlet, when in the second open state, allows less air to flow through the outlet than when in the closed state, and closes the outlet when in the first open state. Air purifier.

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