Filter screen mounting structure and air purifier

Abstract

This application relates to a filter mounting structure and an air purifier. The filter mounting structure includes a main frame, an annular filter, a driving roller, and a driven roller. The driving roller and the driven roller are rotatably mounted on the upper and lower ends of the main frame, respectively. Both the driving roller and the driven roller include multiple coaxially alternating coarse-diameter portions and fine-diameter portions, with the diameter of the fine-diameter portions being smaller than the diameter of the coarse-diameter portions. Both the driving roller and the driven roller are rotatably connected to the main frame through their fine-diameter portions. The annular filter is fitted onto the driving roller and the driven roller, and the inner surface of the annular filter contacts the coarse-diameter portions of the driving roller and the driven roller. The filter mounting structure and air purifier designed in this application, by designing the roller bodies of the driving roller and the driven roller as multiple coaxially alternating coarse-diameter portions and ensuring that the annular filter mainly contacts the coarse-diameter portions and the roller is connected to the main frame through the fine-diameter portions, effectively improves the bending strength and structural rigidity of the roller and effectively prevents bending deformation of the roller due to stress.

Description

Technical Field

[0001] This application relates to the field of air purifier technology, and in particular to a filter installation structure and an air purifier. Background Technology

[0002] Air purifiers, as devices that effectively improve indoor air quality, can remove particulate matter, harmful gases, and odors from the air, and are widely used in modern homes and offices. To enhance user experience and reduce maintenance frequency, some air purifiers are equipped with a self-cleaning module, which performs preliminary filtration of incoming air, intercepting adhering particles such as pet hair and lint, and then removes and collects them from the filter through an automatic cleaning mechanism, thereby extending the lifespan of the downstream HEPA / activated carbon filter.

[0003] However, the self-cleaning module equipped in air purifiers is prone to bending and deformation under long-term stress or impact loads, resulting in low structural stability and a short service life. Utility Model Content

[0004] To address the aforementioned issues, this application provides a stable filter installation structure and an air purifier suitable for long-term use.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a filter installation structure, including a main frame, an annular filter, a drive roller, and a driven roller. The drive roller and the driven roller are rotatably mounted at the upper and lower ends of the main frame, respectively. Each drive roller and the driven roller includes multiple coaxially alternating coarse-diameter portions and fine-diameter portions, the diameter of the fine-diameter portion being smaller than the diameter of the coarse-diameter portion. Both the drive roller and the driven roller are rotatably connected to the main frame through their fine-diameter portions. The annular filter is fitted onto the drive roller and the driven roller, and the inner surface of the annular filter is in contact with the coarse-diameter portions of the drive roller and the driven roller.

[0006] Preferably, the lower edge of the main frame is provided with bearing seats at both ends, and a first bearing is fixed inside the bearing seat. The two ends of the drive roller are respectively connected and fixed to the inner rings of the first bearings on both sides.

[0007] Preferably, one end of the drive roller extends out of the bearing housing to form an exposed portion, and a gear is connected to the exposed portion for receiving driving force.

[0008] Preferably, the lower edge of the main frame is provided with a support sleeve that fits into the narrow diameter portion of the drive roller. The support sleeve includes a male half-sleeve and a female half-sleeve. The female half-sleeve is an integral structure with the main frame. The male half-sleeve is detachably installed on the main frame by fasteners, and the corresponding positions of the male half-sleeve and the female half-sleeve are provided with a snap-fit ​​structure that engages with each other.

[0009] Preferably, the driven roller is provided with a self-tensioning structure that keeps the annular filter screen taut.

[0010] Preferably, the driven roller is connected to a second bearing at both ends. The self-tensioning structure includes a slider and a first spring. One end of the slider is connected to the outer ring of the second bearing. The main frame is provided with a first groove that cooperates with the slider. The other end of the slider extends into the first groove and slides in cooperation with the first groove. The first spring is housed in the first groove and is in a compressed state to provide an elastic force that moves the driven roller away from the driving roller.

[0011] Preferably, the self-tensioning structure further includes a positioning sleeve and a second spring. One end of the positioning sleeve is sleeved on the narrow diameter portion in the middle of the driven roller. The main frame is provided with a second sliding groove corresponding to the position of the positioning sleeve. The other end of the positioning sleeve extends into the second sliding groove and slides with the second sliding groove. The second spring is housed in the second sliding groove and is in a compressed state to provide elastic force that causes the driven roller to move away from the driving roller.

[0012] Preferably, one end of the positioning sleeve is a C-shaped sleeve, the inner peripheral wall of the C-shaped sleeve is provided with a positioning protrusion, and the outer peripheral wall of the narrow diameter portion of the driven roller is provided with an annular groove of a width adapted to the positioning protrusion. The positioning protrusion extends into the annular groove and allows the narrow diameter portion of the driven roller to rotate around the C-shaped sleeve.

[0013] Secondly, embodiments of this application provide an air purifier, including a housing and a filter mounting structure as described in any embodiment of the first aspect, wherein the filter mounting structure is disposed on the air inlet side of the housing.

[0014] Preferably, the air purifier further includes a scraper and a dust collection module. The scraper is disposed on the dust collection module or the housing. The top of the dust collection module is provided with a collection port. One end of the scraper extends above the collection port and is disposed close to the mesh surface of the annular filter to scrape off the adhering substances on the surface of the annular filter. A breathable dust collection bag is detachably disposed in the inner cavity of the dust collection module. The dust collection bag is used to collect the adhering substances scraped off from the annular filter and falling into the collection port.

[0015] The filter installation structure and air purifier designed in this application improve the bending strength and structural rigidity of the rollers by designing the roller bodies of the active roller and the driven roller as multiple coaxially alternating coarse and fine diameter sections, and by making the annular filter mainly contact the coarse diameter section and the rollers connected to the main frame through the fine diameter section. This effectively prevents the rollers from bending and deforming due to stress, and ensures the smooth operation and uniform tension of the annular filter. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the air purifier provided in the embodiments of this application.

[0017] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0018] Figure 3 This is a schematic diagram of the filter installation structure provided in the embodiments of this application.

[0019] Figure 4 This is an exploded view of the filter installation structure provided in the embodiments of this application.

[0020] Figure 5 yes Figure 4 Enlarged diagram of point B in the middle.

[0021] Figure 6 This is a schematic diagram of the self-tensioning structure provided in the embodiments of this application.

[0022] Figure 7 This is a schematic diagram of the assembly of the driving roller and the driven roller provided in the embodiments of this application.

[0023] Figure 8 yes Figure 7 Enlarged diagram of point C in the middle.

[0024] The components include: filter installation structure 100, air purifier 200, main frame 10, bearing seat 11, first bearing 12, support sleeve 13, male half sleeve 131, female half sleeve 132, snap-fit ​​structure 133, first slide groove 14, second slide groove 15, annular filter 20, drive roller 30, coarse diameter section 31, fine diameter section 32, exposed section 33, gear 34, driven roller 40, second bearing 41, annular groove 42, self-tensioning structure 50, slider 51, first spring 52, positioning sleeve 53, C-shaped ferrule 531, positioning protrusion 532, second spring 54, housing 60, scraper 70, dust collection module 80, collection port 81, and dust collection bag 82. Detailed Implementation

[0025] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0026] In one example, the air purifier's air intake side features a self-cleaning module. This module includes a frame, a drive roller and a driven roller rotatably mounted at the top and bottom of the frame, an annular filter screen fitted onto the drive roller and driven roller respectively at both ends, and a drive device for rotating the drive roller. Both the drive roller and driven roller are cylindrical rollers of equal diameter. Because the annular filter screen is wide and has high tension, and is fitted and tensioned on these two rollers, and because both rollers are cylindrical with equal diameter, their axial span is relatively long, especially in the middle region, making them prone to bending deformation under long-term stress or impact loads. This deformation not only affects the uniformity of tension and operational stability of the annular filter screen, leading to filter misalignment, abnormal noise, or premature wear, but may also reduce the structural stability and service life of the entire self-cleaning module.

[0027] like Figure 1 As shown, this application provides a filter mounting structure 100 and an air purifier 200 including the filter mounting structure 100. The filter mounting structure 100 disclosed in this application, through its roller structure and its cooperation with the annular filter 20, aims to improve the operational stability of the annular filter 20 and the overall durability of the structure. When the filter mounting structure 100 is applied to the air purifier 200, the cyclic rotation of the annular filter 20, in conjunction with the fixed scraping element, enables automatic and continuous interception and efficient removal of larger particles such as pet hair and dander from the air, effectively reducing the frequency and difficulty of manual maintenance by the user.

[0028] Specifically, such as Figure 1 , Figure 2 As shown, the filter mounting structure 100 is disposed on the air inlet side of the air purifier 200. In this embodiment, the air purifier also includes a scraper 70 and a dust collection module 80. The scraper 70 is disposed on the dust collection module 80 or the housing 60. The top of the dust collection module 80 is provided with a collection port 81. One end of the scraper 70 extends above the collection port 81 and is disposed close to the mesh surface of the annular filter 20 to scrape off the adhering substances on the surface of the annular filter 20. A breathable dust collection bag 82 is detachably disposed in the inner cavity of the dust collection module 80. The dust collection bag 82 is used to collect the adhering substances scraped off from the annular filter 20 and falling into the collection port 81.

[0029] During operation: The air duct with a predetermined path is defined inside the housing 60. When the fan installed in the air duct is started, the ambient air is drawn into the air duct from the air intake side of the air purifier 200. The air first flows through the filter installation structure 100 located on the air intake side. The annular filter 20 on it effectively physically intercepts airborne particles such as pet hair, dander, and lint. The air that has undergone preliminary filtration then flows to the downstream air duct for deep purification, such as HEPA filter or activated carbon filter. Finally, the clean air is discharged into the indoor environment from the air outlet at the top, rear, or side of the housing 60. During the air purification process described above, the annular filter 20 within the filter installation structure 100 rotates continuously or intermittently under the drive of its driving mechanism. When the deposits intercepted on the annular filter 20 reach the location of the scraper 70 as the filter rotates, the scraper 70 scrapes them off the filter surface. At this time, the collection port 81 at the top of the dust collection module 80 accurately receives these scraped deposits, which then fall into and are stored in a removable, breathable dust collection bag 82 within its inner cavity. Users can easily remove, clean, or replace the dust collection bag 82 when needed. In this embodiment, the angle between the scraper 70 and the vertical direction, i.e., the tilt angle, can be set from 5 degrees to 40 degrees, specifically 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, etc.

[0030] It should be understood that although this embodiment mainly illustrates the application of the filter installation structure 100 in the air purifier 200, those skilled in the art should understand that the filter installation structure 100, with its automatic cleaning and deposit interception capabilities, can also be widely used in other devices that require pre-filtration of air or gas to remove larger particles or fibrous deposits, such as fresh air systems, air conditioning equipment, vacuum cleaners, etc. This application does not specifically limit such application scenarios.

[0031] Next, the specific structural features of the filter installation structure 100 in the embodiments of this application will be described in detail.

[0032] like Figure 3 , Figure 4 As shown in the figure, this application provides a filter installation structure, which mainly includes a main frame 10, an annular filter 20, an active roller 30, and a driven roller 40.

[0033] Specifically, such as Figures 4 to 6As shown, the driving roller 30 and driven roller 40 are rotatably mounted on opposite ends of the main frame 10, such as the upper and lower ends shown in the figure, via rotating connecting parts such as bearings or bushings, to form the circulation path of the annular filter 20. Both the driving roller 30 and driven roller 40 include multiple coaxially alternating coarse-diameter portions 31 and fine-diameter portions 32, with the diameter of the fine-diameter portion 32 being smaller than the diameter of the coarse-diameter portion 31. Both the driving roller 30 and driven roller 40 are rotatably connected to the main frame 10 through their fine-diameter portions 32. The annular filter 20 is fitted onto the driving roller 30 and driven roller 40, and the inner surface of the annular filter 20 contacts the coarse-diameter portions 31 of the driving roller 30 and driven roller 40. In this embodiment, the annular filter 20 can be made of a flexible material with good air permeability, sufficient mechanical strength, and ease of cleaning, such as nylon mesh of a specific mesh count or durable plastic mesh fabric. Its overall shape can be designed as follows: Figure 1 The annular structure, resembling a flat running track, forms an arc-shaped segment around the drive roller 30 and driven roller 40, while a straight segment with relatively parallel front and rear sides forms between the two rollers. Furthermore, the annular filter 20 can be driven by a motor, which drives the drive roller 30 to rotate at a preset speed via a gear transmission assembly or a synchronous belt transmission assembly, thereby causing the annular filter 20 to continuously and cyclically rotate on the main frame 10. In this embodiment, the annular filter 20 is arranged vertically, or at a slight angle to the vertical direction, such as an angle between 0.5 degrees and 3 degrees.

[0034] In this way, the inner surface of the annular filter 20 mainly contacts the larger diameter portion 31, which provides a more stable support surface and a larger effective contact area for the annular filter 20. The presence of the larger diameter portion 31 effectively increases the moment of inertia of the roller section in these key stress areas, thereby significantly improving the roller's ability to resist bending deformation caused by the tension of the annular filter 20 or external operating loads. At the same time, both the driving roller 30 and the driven roller 40 are rotatably connected to the main frame 10 through the smaller diameter portion 32 of their roller bodies. These smaller diameter portions 32 can appropriately reduce the overall weight of the rollers while meeting the requirements of connection strength and bearing (or bushing) fit. More ingeniously, the radial space formed between the smaller diameter portion 32 and the adjacent larger diameter portion 31 can be used to accommodate the support structure on the main frame 10 used to connect and support the smaller diameter portion 32 (such as the protruding part of the bearing seat or the fixed end of the bushing), making the overall structure more compact and ensuring that the support structure of the main frame does not interfere with the cyclically rotating annular filter 20, thus ensuring the smooth rotation of the annular filter 20.

[0035] In some embodiments, such as Figure 4 , Figure 5 , Figure 7As shown, bearing seats 11 are provided at both ends of the lower edge of the main frame 10, and a first bearing 12 is fixed inside the bearing seat 11. The two ends of the drive roller 30 are respectively connected and fixed to the inner rings of the first bearings 12 on both sides. The two ends of the roller body of the drive roller 30 can be inserted into and fixedly connected to the inner rings of the first bearings 12 on both sides by means of interference fit, key connection, etc., to ensure that the drive roller 30 and the inner rings of the first bearings 12 can rotate synchronously and the axial position is reliably fixed.

[0036] In some embodiments, such as Figure 3 , Figure 5 As shown, one end of the drive roller 30 extends out of the bearing housing 11 to form an exposed portion 33, and a gear 34 is connected to the exposed portion 33 to receive driving force. When, for example, the motor drive mechanism is working, the power is transmitted to the drive roller 30 through the gear 34, thereby driving the drive roller 30 to rotate, and finally driving the annular filter screen 20 to rotate in a cycle.

[0037] In some embodiments, such as Figure 5 , Figure 7 As shown, the lower edge of the main frame 10 is provided with a support sleeve 13 that fits into the narrow diameter portion 32 of the drive roller 30. The support sleeve 13 includes a male half-sleeve 131 and a female half-sleeve 132. The female half-sleeve 132 is an integral structure with the main frame 10. For example, during the injection molding of the main frame 10, a semi-cylindrical groove or U-shaped seat is directly formed on its edge, and its inner diameter is adapted to the outer diameter of the narrow diameter portion 32 of the drive roller 30. The male half-sleeve 131 is detachably installed on the main frame 10 by fasteners. Its shape corresponds to the female half-sleeve 132 and also has a semi-cylindrical concave surface. When the narrow diameter portion 32 of the drive roller 30 is placed in the groove of the female half-sleeve 132, the male half-sleeve 131 covers it from the other side and together with the female half-sleeve 132, forms a complete cylindrical hole sleeve, which encloses the narrow diameter portion 32 of the drive roller 30.

[0038] In addition, the male half-set 131 and the female half-set 132 are provided with a snap-fit ​​structure 133 at corresponding positions. For example, a protruding tenon can be provided on the edge of one half-set, and a recessed groove can be provided at the corresponding position of the other half-set. When the two half-sets are closed, the tenon and the groove engage to form an auxiliary positioning and locking mechanism, preventing the male half-set 131 from loosening or misaligning when the fasteners are not fully locked or when it is subjected to an accidental impact.

[0039] In some embodiments, such as Figure 4 As shown, the driven roller 40 is provided with a self-tensioning structure 50 to keep the annular filter screen 20 taut. This maintains the optimal working tension of the annular filter screen 20, ensuring stable and smooth operation of the annular filter screen 20 and preventing slippage and abnormal wear.

[0040] In some embodiments, such as Figure 4 , Figure 6 , Figure 7 As shown, the driven roller 40 has two ends connected to second bearings 41. The self-tensioning structure 50 includes a slider 51 and a first spring 52. One end of the slider 51 is connected to the outer ring of the second bearing 41. The main frame 10 has a first groove 14 that cooperates with the slider 51. The other end of the slider 51 extends into the first groove 14 and slides with it. The first spring 52 is housed in the first groove 14 and is in a compressed state, providing a spring force to move the driven roller 40 away from the driving roller 30. With this structural arrangement, when the annular filter screen 20 becomes loose, the spring force of the first spring 52 will automatically push the slider 51, thereby causing the driven roller 40 to move outward to compensate for the increase in the length of the filter screen, thus re-tensioning the annular filter screen 20 and restoring it to the preset tension state.

[0041] In some embodiments, such as Figure 4 , Figure 6 , Figure 7 As shown, the self-tensioning structure 50 also includes a positioning sleeve 53 and a second spring 54. One end of the positioning sleeve 53 is sleeved on the narrow diameter portion 32 in the middle of the driven roller 40. The main frame 10 has a second groove 15 corresponding to the position of the positioning sleeve 53. The other end of the positioning sleeve 53 extends into the second groove 15 and slides in cooperation with the second groove 15. The second spring 54 is housed in the second groove 15 and is in a compressed state, providing a spring force to move the driven roller 40 away from the driving roller 30. Similarly, when the annular filter 20 relaxes, the spring force of the second spring 54 will push the positioning sleeve 53 and the driven roller 40 connected thereto to move outward to restore the preset tension of the relaxed annular filter 20. When the self-tensioning mechanism of the central positioning sleeve 53 and the second spring 54 is used in conjunction with the self-tensioning mechanism of the sliders 51 at both ends of the driven roller 40 and the first spring 52, it can provide more balanced and distributed support and tension along the entire axial length of the driven roller 40, thus avoiding operational problems that may occur due to the excessive width of the annular filter screen 20.

[0042] In some embodiments, such as Figure 4 , Figure 6 , Figure 7 , Figure 8As shown, one end of the positioning sleeve 53 is a C-shaped sleeve 531. The inner peripheral wall of the C-shaped sleeve 531 is provided with a positioning protrusion 532. The outer peripheral wall of the narrow diameter portion 32 of the driven roller 40 is provided with an annular groove 42 whose width is adapted to the positioning protrusion 532. The positioning protrusion 532 extends into the annular groove 42 and enables the narrow diameter portion 32 of the driven roller 40 to rotate around the C-shaped sleeve 531. During assembly, the C-shaped sleeve 531 is aligned with the narrow diameter portion 32 of the driven roller 40 through its opening, and an appropriate force is applied to make it snap into place. When the C-shaped sleeve 531 is fully fitted onto the narrow diameter portion 32, the positioning protrusion 532 on its inner wall extends into the annular groove 42 on the outer peripheral wall of the narrow diameter portion 32, so that the positioning protrusion 532 is constrained between the two side walls of the annular groove 42, effectively restricting the relative movement of the driven roller 40 relative to the positioning sleeve 53 in the axial direction, and without interfering with the free rotation of the narrow diameter portion 32 of the driven roller 40 around its own axis relative to the C-shaped sleeve 531.

[0043] The filter installation structure and air purifier provided in this application embodiment are designed with multiple coaxially alternating coarse and fine diameter sections on the roller body of the active roller and the driven roller. The annular filter mainly contacts the coarse diameter section, and the roller is connected to the main frame through the fine diameter section. This effectively improves the bending strength and structural rigidity of the roller, effectively prevents the roller from bending and deforming due to force, and ensures the smooth operation and uniform tension of the annular filter.

[0044] In the description of this application, it should be noted that the terms "vertical", "up", "down", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0045] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A filter screen installation structure, characterized in that, The system includes a main frame, an annular filter screen, a drive roller, and a driven roller. The drive roller and the driven roller are rotatably mounted at the upper and lower ends of the main frame, respectively. Each drive roller and the driven roller includes multiple coaxially arranged alternating coarse-diameter portions and fine-diameter portions. The diameter of the fine-diameter portion is smaller than the diameter of the coarse-diameter portion. Both the drive roller and the driven roller are rotatably connected to the main frame through their fine-diameter portions. The annular filter screen is fitted onto the drive roller and the driven roller, and the inner surface of the annular filter screen is in contact with the coarse-diameter portions of the drive roller and the driven roller.

2. The filter installation structure according to claim 1, characterized in that, Bearing seats are provided at both ends of the lower edge of the main frame, and a first bearing is fixed inside the bearing seat. The two ends of the drive roller are respectively connected and fixed to the inner rings of the first bearing on both sides.

3. The filter installation structure according to claim 2, characterized in that, One end of the drive roller extends out of the bearing housing to form an exposed portion, and a gear is connected to the exposed portion for receiving driving force.

4. The filter installation structure according to claim 1, characterized in that, The lower edge of the main frame is provided with a support sleeve that fits into the narrow diameter portion of the drive roller. The support sleeve includes a male half-sleeve and a female half-sleeve. The female half-sleeve is an integral structure with the main frame. The male half-sleeve is detachably installed on the main frame by fasteners, and the corresponding positions of the male half-sleeve and the female half-sleeve are provided with a snap-fit ​​structure that engages with each other.

5. The filter screen installation structure according to claim 1, characterized in that, The driven roller is provided with a self-tensioning structure that keeps the annular filter screen taut.

6. The filter screen installation structure according to claim 5, characterized in that, The driven roller is connected to a second bearing at both ends. The self-tensioning structure includes a slider and a first spring. One end of the slider is connected to the outer ring of the second bearing. The main frame is provided with a first groove that cooperates with the slider. The other end of the slider extends into the first groove and slides in cooperation with the first groove. The first spring is housed in the first groove and is in a compressed state to provide elastic force that moves the driven roller away from the driving roller.

7. The filter screen installation structure according to claim 5, characterized in that, The self-tensioning structure also includes a positioning sleeve and a second spring. One end of the positioning sleeve is sleeved on the narrow diameter portion in the middle of the driven roller. The main frame is provided with a second sliding groove corresponding to the position of the positioning sleeve. The other end of the positioning sleeve extends into the second sliding groove and slides with the second sliding groove. The second spring is housed in the second sliding groove and is in a compressed state to provide elastic force to move the driven roller away from the driving roller.

8. The filter installation structure according to claim 7, characterized in that, One end of the positioning sleeve is a C-shaped sleeve, and the inner peripheral wall of the C-shaped sleeve is provided with a positioning protrusion. The outer peripheral wall of the narrow diameter portion of the driven roller is provided with an annular groove of a width adapted to the positioning protrusion. The positioning protrusion extends into the annular groove and allows the narrow diameter portion of the driven roller to rotate around the C-shaped sleeve.

9. An air purifier, characterized in that, It includes a housing and a filter mounting structure as described in any one of claims 1-8, wherein the filter mounting structure is disposed on the air inlet side of the housing.

10. The air purifier according to claim 9, characterized in that, The air purifier also includes a scraper and a dust collection module. The scraper is disposed on the dust collection module or the housing. The top of the dust collection module is provided with a collection port. One end of the scraper extends above the collection port and is disposed close to the mesh surface of the annular filter to scrape off the adhering substances on the surface of the annular filter. A breathable dust collection bag is detachably disposed in the inner cavity of the dust collection module. The dust collection bag is used to collect the adhering substances scraped off from the annular filter and falling into the collection port.

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