Air purifier

Abstract

An air cleaner includes a main body having an inlet through which air can flow, a blower accommodated in the main body and providing a wind force to make the air flow, a filter filtering the air flowing into the main body, a wind direction adjusting unit adjusting a direction in which purified air flowing through the filter is discharged, an operation module operated by a user to output a signal, and a control device controlling the wind direction adjusting unit by the signal. The wind direction adjusting unit includes a wind direction adjusting member configured to be rotatable with respect to the main body about a rotation axis extending in a horizontal direction, a motor providing a driving force to rotate the wind direction adjusting member, a driving gear rotated by the driving force provided by the motor, and a driven gear rotated by the driving gear. If the driving gear is stopped while rotating, the control device controls the motor such that the driving gear is stopped after rotating in a reverse direction by a predetermined angle.

Description

Technical Field

[0001] This invention relates to an air purifier. Background Technology

[0002] Generally speaking, an air purifier is a device that draws in polluted indoor air and filters out dust, odor particles, and other contaminants to purify it into clean air. After drawing in and purifying the surrounding polluted air, the air purifier discharges the purified air outside the device, thus purifying the indoor air.

[0003] This air purifier may include a blower that draws air in, a filter for filtering dust and odor particles contained in the air, a rotatable airflow adjustment unit to expel the clean, purified air flowing through the filter in multiple directions, and a user-operated control module. The user can rotate the blower and the airflow adjustment unit by manipulating the control module.

[0004] In this regard, LG Electronics Corporation’s Korean Patent Publication No. 10-2019-0049675, “Air Purifier” (hereinafter referred to as Patent Document 1), discloses an air purifier, which includes: a fan housing for exhausting air; a second rack for rotating the fan housing in a vertical direction; a flow conversion device including a second gear that rotates in engagement with the second rack; and a display device placed inside the fan housing and operated by the user.

[0005] However, Patent Document 1 only discloses that the second gear rotates in mesh with the second rack to rotate the fan housing in the vertical direction, without disclosing the method of re-rotating the second gear to prevent the second rack from rotating relative to the second gear under the action of an external force after the second gear has stopped. In other words, according to Patent Document 1, when the user presses the display device after the rotation of the second gear has stopped, the display may wobble relative to the fan housing due to the gap between the second rack and the second gear, and this wobble caused by the gap can cause discomfort to the user. Summary of the Invention

[0006] Technical issues

[0007] One embodiment of the present invention was invented in view of the above background, and aims to provide an air purifier that minimizes the shaking of the operating module caused by the user's operation when the user operates the operating module after the rotation of the drive gear has stopped.

[0008] Problem-solving methods

[0009] An air purifier according to one aspect of the present invention includes: a main body having an inlet for air inflow; a blower housed inside the main body and providing airflow to circulate the air; a filter for filtering the air flowing into the interior of the main body; an airflow direction adjustment unit for adjusting the direction in which purified air flowing through the filter is discharged; an operation module operated by a user to output a signal; and a control device for controlling the airflow direction adjustment unit via the signal, wherein the airflow direction adjustment unit includes: an airflow direction adjustment member configured to rotate relative to the main body about a horizontally extending axis of rotation; a motor providing driving force to rotate the airflow direction adjustment member; and an active... A gear rotates by the driving force provided by the motor; and a driven gear is rotated by the driving gear. The operating module is mounted on the wind direction adjusting member, and when viewed from above, the operating module is spaced apart from the rotation axis of the wind direction adjusting member. When the driving gear rotates clockwise, the wind direction adjusting member rotates in the downward direction of the operating module. When the driving gear rotates in the reverse direction opposite to the clockwise direction, the wind direction adjusting member rotates in the upward direction of the operating module. When the driving gear stops after rotation, the control device controls the motor so that the driving gear rotates a predetermined angle in the reverse direction and then stops.

[0010] Furthermore, the driving gear includes multiple driving gear teeth, and the driven gear includes multiple driven gear teeth. The multiple driven gear teeth include a first driven gear tooth and a second driven gear tooth disposed adjacent to the first driven gear tooth. The multiple driving gear teeth include a meshing driving gear tooth, which is disposed between the first driven gear tooth and the second driven gear tooth. When the driving gear rotates forward, the meshing driving gear tooth is in close contact with the first driven gear tooth to drive the driven gear to rotate. When the driving gear rotates in reverse, the meshing driving gear tooth is in close contact with the second driven gear tooth to drive the driven gear to rotate. When the driving gear stops rotating in the forward direction, the control device controls the motor to rotate the driving gear in the reverse direction so that the meshing driving gear tooth is in close contact with the second driven gear tooth.

[0011] In addition, an air purifier may be provided in which, when the drive gear stops rotating in the forward direction, the control device controls the motor so that the drive gear rotates in the reverse direction by a preset first angle, so that the meshing drive gear teeth are in close contact with the second driven gear teeth.

[0012] In addition, an air purifier may be provided in which, when the drive gear stops rotating in the reverse direction, the control device controls the motor so that the drive gear rotates in the reverse direction at a second angle different from the first angle, so that the meshing drive gear teeth and the second driven gear teeth are in closer contact.

[0013] In addition, an air purifier may be provided in which the first angle is greater than the second angle.

[0014] In addition, an air purifier may be provided, which further includes: a lifting unit controlled by the control device for raising or lowering the airflow adjustment unit, wherein the airflow adjustment unit is in an open state, spaced upward relative to the main body to open the upper part of the main body, or in a closed state, in close contact with the main body to close the upper part of the main body, when the airflow adjustment unit switches to the closed state, the driving gear reverses so that the meshing driving gear teeth are in close contact with the second driven gear teeth.

[0015] In addition, an air purifier can be provided in which, when switched to the off state, the airflow adjustment unit drives the airflow adjustment member to descend a first distance from the open state toward the main body, then rise a second distance less than the first distance, and then descend toward the main body again, and the drive gear reverses so that after rising a second distance, the meshing drive gear teeth are in close contact with the second driven gear teeth.

[0016] In addition, an air purifier may be provided in which, when the airflow adjustment unit is switched to the off state, the drive gear reverses, such that the meshing drive gear teeth are in close contact with the second driven gear teeth before the airflow adjustment member begins to descend.

[0017] The effects of the invention

[0018] According to one aspect of the present invention, the operating part has the effect of minimizing the shaking caused by the force of the user pressing the control module. Attached Figure Description

[0019] Figure 1 This is a perspective view showing an air purifier according to a first embodiment of the present invention.

[0020] Figure 2 It is along Figure 1 The cross-sectional view after line II-II is cut off.

[0021] Figure 3 yes Figure 1 A side view of an air purifier.

[0022] Figure 4yes Figure 1 A side view of an air purifier.

[0023] Figure 5 yes Figure 1 A side view of the airflow adjustment unit of an air purifier when the drive gear is rotating forward.

[0024] Figure 6 yes Figure 1 A side view of an air purifier with its airflow adjustment unit in the off position.

[0025] Figure 7 yes Figure 1 A top view of the driving gear and driven gear of an air purifier when the driving gear rotates in both directions.

[0026] Figure 8 yes Figure 1 A top view of the driving gear and driven gear of an air purifier when the driving gear reverses and then reverses again. Detailed Implementation

[0027] Hereinafter, specific embodiments for implementing the technical concept of the present invention will be described in detail with reference to the accompanying drawings.

[0028] Furthermore, in describing the present invention in detail, if a specific description of a related known structure or function is considered to deviate from the spirit of the present invention, its detailed description will be omitted.

[0029] Furthermore, it should be understood that when a component is referred to as “supporting,” “flowing into,” “draining out,” or “flowing toward” other components, it may be directly “supporting,” “flowing into,” “draining out,” or “flowing toward” other components, but it may also exist in other intermediary components.

[0030] The terminology used in this specification is for describing particular embodiments only and is not intended to limit the invention. Unless otherwise stated, the singular form also includes the plural form.

[0031] In addition, various components may be described using ordinal terms such as first and second, but these components are not limited by these terms. These terms are only used to distinguish one component from another.

[0032] The term "comprising" as used in this specification is used to specifically indicate a particular characteristic, region, integer, step, operation, element, and / or ingredient, but does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, ingredients, and / or groups.

[0033] Furthermore, it should be stated in advance that the descriptions of direction such as "up" and "down" in this specification are based on the accompanying drawings. When the illustrated orientation of the object being described changes, the descriptions may differ. On the other hand, the up and down direction in this specification may also refer to the z-axis direction.

[0034] Hereinafter, the specific structure of the air purifier 1 according to the first embodiment of the present invention will be described with reference to the accompanying drawings.

[0035] Reference Figure 1 and Figure 3 According to the first embodiment of the present invention, the air purifier 1 can purify polluted air into clean air by filtering dust and odor particles from the air flowing into the interior of the air purifier 1. This air purifier 1 can draw in outside air and discharge the purified air to the outside. This air purifier 1 may include a main body 100, a blower 200, a filter 300, an airflow adjustment unit 400, a lifting unit 500, a control device 600, and an operation module 700.

[0036] The main body 100 can internally accommodate the blower 200 and filter 300, and can support the blower 200, filter 300, airflow adjustment unit 400, and lifting unit 500. An inlet 110 can be formed on the main body 100 so that air from outside the air purifier 1 flows into the interior through the inlet 110. This inlet 110 can be formed to penetrate the main body 100, and multiple inlets 110 can be provided. Multiple inlets 110 can be formed along the circumference of the main body 100. Additionally, the main body 100 can be configured to form all or part of an outlet for discharging filtered air to the outside of the air purifier 1. Furthermore, the upper part of the main body 100 can be opened or closed via the airflow adjustment unit 400.

[0037] The blower 200 can provide airflow to draw air from outside the air purifier 1 into its interior and then exhaust it to the outside. Furthermore, the blower 200 can be driven to discharge air filtered by the filter 300 to the outside of the air purifier 1. This blower 200 can be arranged to be surrounded by multiple filters 300.

[0038] Filter 300 can filter outside air into clean air. For example, filter 300 may include known filters such as pre-filters, HEPA filters, and deodorizing filters to filter dust and odor particles from the air. Additionally, filter 300 may include filter components and a filter frame for supporting the filter components. Multiple such filters 300 may be provided, and the multiple filters may be configured to fold or unfold relative to adjacent filters.

[0039] Reference Figures 4 to 6The airflow adjustment unit 400 can adjust the direction in which purified air flowing through the filter 300 is discharged. This airflow adjustment unit 400 can be configured to rotate relative to the main body 100 about a horizontally extending axis of rotation R. This airflow adjustment unit 400 may include an airflow adjustment member 410, a motor 420, a drive gear 430, and a driven gear 440.

[0040] The wind direction adjustment member 410 is configured to rotate relative to the main body 100 with a rotation axis extending horizontally. For example, the wind direction adjustment member 410 can rotate to tilt at a predetermined angle relative to the main body 100 or to be in a horizontal position relative to the main body. Alternatively, when viewed from above, the wind direction adjustment member 410 can be configured such that the operation module 700 is spaced apart from the rotation axis R of the wind direction adjustment member 410.

[0041] The motor can provide driving force to rotate the wind direction adjusting member 410. The motor 420 can be driven to rotate the wind direction adjusting member 410 in one direction or in the opposite direction. In other words, the wind direction adjusting member 410 can be rotated under the drive of the motor 420 to tilt to one side or to the other side.

[0042] Reference Figure 7 and Figure 8 The drive gear 430 can be rotated by the driving force provided by the motor 420. When the drive gear 430 rotates forward, the wind direction adjusting member 410 can rotate in the downward direction of the operation module 700. In addition, when the drive gear 430 rotates in the reverse direction, opposite to the forward rotation direction, the wind direction adjusting member 410 can rotate in the upward direction of the operation module 700.

[0043] Furthermore, the driving gear 430 may include a plurality of driving gear teeth 431. The driving gear 430 may mesh with the driven gear 440 such that any one of the plurality of driving gear teeth 431 is arranged sequentially between the plurality of driven gear teeth 441 and 442 according to the direction of rotation, as will be described later.

[0044] Driven gear 440 can mesh with and rotate through driving gear 430. For example, driven gear 440 can be disposed above driving gear 430 and mesh with driving gear 430. Wind direction adjustment member 410 can rotate through the rotation of driven gear 440. In addition, driven gear 440 may include a plurality of driven gear teeth. The plurality of driven gear teeth may be arranged at certain intervals on the entire circumference of driven gear 440, or may be arranged at certain intervals only on a portion of the circumference of driven gear 440. The plurality of driven gear teeth may include a first driven gear tooth 441 and a second driven gear tooth 442 disposed adjacent thereto, and the plurality of driving gear teeth 431 may include a meshing driving gear tooth 431 disposed between the first driven gear tooth 441 and the second driven gear tooth 442. Among the multiple driving gear teeth and multiple driven gear teeth, the first driven gear tooth 441, the second driven gear tooth 442, and the meshing driving gear tooth 431 can be defined as one driving gear tooth and two driven gear teeth meshing with each other according to the relative rotation of the driving gear 430 and the driven gear 440. The driving gear tooth disposed between the driven gear teeth changes with the rotation of the driving gear 430 and the driven gear 440; therefore, the first driven gear tooth 441, the second driven gear tooth 442, and the meshing driving gear tooth 431 defined above change according to the rotation of the driving gear 430 and the driven gear 440.

[0045] When the driving gear 430 rotates forward, the driven gear 440 rotates as the meshing driving gear teeth 431 and the first driven gear teeth 441 are in close contact; when the driving gear 430 rotates in reverse, the meshing driving gear teeth 431 and the second driven gear teeth 442 are in close contact and rotate.

[0046] Additionally, the air purifier 1 can provide an exhaust space for discharging clean air between the main body 100 and the airflow adjustment unit 400. In other words, when the airflow adjustment member 410 is moved to a position spaced apart from the main body 100, it can provide an exhaust space.

[0047] This emission space can be divided into a first emission area S1 and a second emission area S2. The first emission area S1 refers to the area where air is emitted to one side of the airflow adjustment unit 400, and the second emission area S2 refers to the area where air is emitted to the other side of the airflow adjustment unit 400. For example, when the drive gear 430 rotates clockwise, the airflow adjustment unit 400 rotates, causing the first emission area S1 to increase and the second emission area S2 to decrease. Conversely, when the drive gear 430 rotates counterclockwise, the airflow adjustment unit 400 rotates, causing the first emission area S1 to decrease and the second emission area S2 to increase. When the air purifier is viewed from the side, the first emission area S1 is located on one side of the lifting unit 500, and the second emission area S2 is located on the other side of the lifting unit 500. The first emission area S1 and the second emission area S2 can form an emission port. In other words, the first emission area S1 can correspond to one side of an emission port, and the second emission area S2 can correspond to the other side of such an emission port.

[0048] The lifting unit 500 can raise or lower the airflow adjustment unit 400 relative to the main body 100. The lifting unit 500 can raise the airflow adjustment unit 400 to open the upper part of the main body 100, or lower the airflow adjustment unit 400 to close the upper part of the main body 100. Through this lifting unit 500, such as... Figure 3 As shown, the wind direction adjustment unit 400 can rise upward relative to the main body 100 to be in an open state where the upper part of the main body 100 is opened, or, as... Figure 6 As shown, it can descend toward the main body 100, thereby reaching a closed state where it is in close contact with the main body 100 to close the upper part. Furthermore, the lifting unit 500 is movably supported by the main body 100 in the vertical direction. For example, the lifting unit 500 may include a rack and pinion for lifting.

[0049] The control device 600 can control the drive of the blower 200, the airflow adjustment unit 400, and the lifting unit 500 via signals from the operation module 700. This control device 600 can be implemented using a computing device including a microprocessor and a memory, and its implementation method is obvious to those skilled in the art; therefore, further detailed description will be omitted.

[0050] The operation module 700 may include multiple input units for user operation of the air purifier 1, such input units including buttons, touchpads, etc. The operation module 700 sends signals based on user operations to the control device 600, which can then operate other components of the air purifier 1 based on the signals input from the operation module 700. Input units provided in the operation module 700 may include, for example, a wind speed input for operating the blower's airflow, a lifting input for raising or lowering the lifting unit, and a rotation input for rotating the airflow direction adjustment unit. The operation module 700 is mounted on the airflow direction adjustment member 410 and, when viewed from above, may be spaced apart from the rotation axis R of the airflow direction adjustment member 410. When the drive gear 430 rotates forward, the operation module 700 descends, and when the drive gear 430 rotates in the reverse direction, the operation module 700 ascends.

[0051] The operation and effects of an air purifier 1 according to an embodiment of the present invention will now be described. The operation described below can be performed by a control device 600 controlling components of the air purifier 1, such as a blower 200, a filter 300, an airflow adjustment unit 400, and a lifting unit 500.

[0052] When the operation of the rotating drive gear 430 stops, the motor 420 of the air purifier 1 according to an embodiment of the present invention can be temporarily driven to change the rotation direction of the drive gear 430, and then the transmission of driving force to the drive gear 430 can be stopped. Specifically, the motor transmits driving force to make the drive gear 430 rotate in one direction, and then drives the drive gear 430 to rotate in the opposite direction by a predetermined angle, and then the transmission of driving force to the drive gear 430 can be stopped. Since the drive gear 430 rotates in the opposite direction when it stops during rotation, the drive gear teeth 431 can be in close contact with the second driven gear teeth 442.

[0053] Reference Figure 7 When the drive gear 430 stops during forward rotation, the motor 420 rotates before the drive gear 430 comes to a complete stop, causing the drive gear 430 to reverse by a preset first angle. Therefore, because the motor reverses before coming to a complete stop, the meshing drive gear teeth 431 can make close contact with the second driven gear teeth 442. Thus, even if the user presses the operation module 700 to operate the air purifier 1 while the airflow adjustment member 410 is tilted, it prevents the airflow adjustment unit 400 from shaking.

[0054] Reference Figure 8When the driving gear 430 stops after reversing, it reverses to a second angle different from the first angle to control the motor 420, so that any driving gear tooth 431 and the second driven gear tooth 442 are in closer contact. The second angle can be smaller than the first angle, but is not limited to this.

[0055] On the other hand, when the wind direction adjustment unit 400 switches from the open state to the closed state, the motor 420 can rotate the wind direction adjustment member 410 parallel to the upper surface of the main body 100 and relative to it (e.g., relative in the horizontal direction) before the wind direction adjustment member 410 completely closes the exhaust spaces S1 and S2. In order to switch to the closed state where the wind direction adjustment member 410 closes the upper part of the main body 100, the wind direction adjustment member 410 rotates as it descends toward the main body 100, or it can be pre-rotated before descending toward the main body 100.

[0056] Furthermore, when the wind direction adjustment component 410 descends towards the main body 100, it can rise a predetermined distance after descending towards the main body 100 and then descend again towards the main body 100 to prevent the user's fingers or other objects from being trapped between the wind direction adjustment component 410 and the main body 100. In other words, if the distance the wind direction adjustment component 410 descends to switch to the off state is called the first distance, the distance the wind direction adjustment component 410 rises again after descending can be called the second distance. In this case, the second distance can be less than the first distance.

[0057] On the other hand, when the wind direction adjustment unit 400 switches from the open state to the closed state, the motor 420 can be driven, causing the drive gear 430 to reverse the second angle or rotate by a preset angle less than the second angle. Therefore, when a part of the drive gear 430 switches to the closed state, if the wind direction adjustment unit 400 is in the closed state, it can make close contact with the second driven gear teeth 442.

[0058] As described above, when the drive gear 430 reverses when switching from the open state to the closed state, the wind direction adjusting member 410 can be configured such that the second discharge region S2 is larger than the first discharge region S1. In other words, the wind direction adjusting member 410 can descend in an inclined state. The wind direction adjusting member 410 descending in an inclined state can be arranged relative to each other (e.g., relative in the horizontal direction) so as to rotate in contact with the main body 100 and be placed in the closed state. On the other hand, since the driven gear 440 meshes with and rotates with the wind direction adjusting member 410, the driven gear 440 can rotate relative to the wind direction adjusting member 410, so that the wind direction adjusting member 410 is placed in the closed state. At this time, the direction of rotation of the driven gear 440 will become the direction in which a portion of the second driven gear teeth 442 and the drive gear teeth 431 are in close contact.

[0059] When the wind direction adjustment unit 400 is switched to the closed state, any previously defined driving gear tooth 431 will be in close contact with the second driven gear tooth 442. Therefore, the driving gear tooth 431 can be in close contact with the second driven gear tooth 442 before entering the open state. Thus, even if the user presses the operation module 700 immediately after the wind direction adjustment member 410 is switched from the closed state to the open state, the wind direction adjustment unit 400 can be prevented from shaking.

[0060] Furthermore, during the process of switching the wind direction adjustment unit 400 from the open state to the closed state, when the wind direction adjustment member 410 rises after descending to the main body 100 to prevent pinching the user's fingers, the motor 420 can be driven to reverse the drive gear 430. At this time, when switching from the open state to the closed state, the wind direction adjustment member 410 initially descends to the main body 100 in a state parallel to the side opposite to the closed wind direction adjustment member 410, and after rising, it can descend at an angle relative to the side opposite to the closed wind direction adjustment member 410 when descending to the main body 100 again.

[0061] On the other hand, the above description describes the wind direction regulating member 410 reversing during the second descent. However, embodiments of the present invention are not limited to this. As an example, the drive gear 430 can reverse to switch from the open to the closed state when descent begins from the open state, driven by the motor 420, and the number of descents of the wind direction regulating member 410 during the switch from the open to the closed state is not limited. Furthermore, as another example, the drive gear 430 can be reversed by the motor 420 before the first switch from the open to the closed state begins. The reversal of the drive gear 430 is a preparatory operation before the descent of the wind direction regulating member 410, and it includes the entire process of switching the wind direction regulating unit 400 from the open to the closed state.

[0062] Although embodiments of the invention have been described above by way of specific examples, these are merely examples, and the invention is not limited thereto. The invention should be interpreted as having the broadest scope of the technical concepts disclosed herein. Those skilled in the art can implement patterns of shapes not specified by combining / substituting the disclosed embodiments; however, these should also be included within the scope of the invention. Furthermore, those skilled in the art can readily modify or alter the disclosed embodiments based on this specification, and such modifications or alterations are obviously also included within the scope of the invention.

Claims

1. An air purifier, comprising: The main body forms an entrance through which air can flow in; A blower, housed inside the main body, provides airflow to circulate the air. A filter that filters the air flowing into the interior of the main body; The airflow adjustment unit adjusts the direction in which the air flowing through the filter is discharged; The operation module is operated by the user to output signals; as well as The control device controls the wind direction adjustment unit via the signal. The wind direction adjustment unit includes: The wind direction adjustment component is configured to rotate relative to the main body about a rotation axis extending in the horizontal direction; An electric motor provides driving force to rotate the wind direction regulating component; The drive gear rotates by the driving force provided by the motor; and The driven gear is rotated by the driving gear. The operating module is mounted on the wind direction adjusting component, and when viewed from above, the operating module is spaced apart from the rotation axis of the wind direction adjusting component. When the drive gear rotates clockwise, the wind direction adjusting component rotates in the downward direction of the operating module; when the drive gear rotates in the opposite direction (reverse rotation), the wind direction adjusting component rotates in the upward direction of the operating module. When the drive gear stops after rotating in the forward direction, the control device controls the motor to cause the drive gear to rotate a predetermined angle in the reverse direction and then stop. When the drive gear stops after rotating in the reverse direction, the control device controls the motor to make the drive gear rotate another predetermined angle in the reverse direction and then stop.

2. The air purifier according to claim 1, wherein, The driving gear includes multiple driving gear teeth. The driven gear includes multiple driven gear teeth. The plurality of driven gear teeth includes a first driven gear tooth and a second driven gear tooth disposed adjacent to the first driven gear tooth. The plurality of driving gear teeth includes meshing driving gear teeth, which are disposed between the first driven gear teeth and the second driven gear teeth. When the driving gear rotates clockwise, the meshing driving gear teeth are in close contact with the first driven gear teeth to drive the driven gear to rotate. When the driving gear rotates counterclockwise, the meshing driving gear teeth are in close contact with the second driven gear teeth to drive the driven gear to rotate. When the driving gear stops rotating in the forward direction, the control device controls the motor to rotate the driving gear in the reverse direction so that the meshing driving gear teeth are in close contact with the second driven gear teeth.

3. The air purifier according to claim 2, wherein, When the driving gear stops rotating in the forward direction, the control device controls the motor so that the driving gear rotates in the reverse direction by a preset first angle, so that the meshing driving gear teeth and the second driven gear teeth are in close contact.

4. The air purifier according to claim 3, wherein, When the driving gear stops rotating in the reverse direction, the control device controls the motor so that the driving gear rotates in the reverse direction at a second angle different from the first angle, so that the meshing driving gear teeth and the second driven gear teeth are in closer contact.

5. The air purifier according to claim 4, wherein, The first angle is greater than the second angle.

6. The air purifier according to claim 2, further comprising: The lifting unit, controlled by the control device, is used to raise or lower the wind direction adjustment unit. The wind direction adjustment unit, driven by the lifting unit, is either in an open state, spaced upwards relative to the main body to open the upper part of the main body, or in a closed state, in close contact with the main body to close the upper part of the main body. When the wind direction adjustment unit is switched to the off state, the drive gear reverses so that the meshing drive gear teeth are in close contact with the second driven gear teeth.

7. The air purifier according to claim 6, wherein, When switched to the off state, the wind direction adjustment unit drives the wind direction adjustment component to descend a first distance from the open state towards the main body, then rise a second distance less than the first distance, and then descend towards the main body again. The driving gear reverses so that after rising the second distance, the meshing driving gear teeth and the second driven gear teeth are in close contact.

8. The air purifier according to claim 6, wherein, When the wind direction adjustment unit is switched to the off state, the drive gear reverses, so that the meshing drive gear teeth are in close contact with the second driven gear teeth before the wind direction adjustment component begins to descend.

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