An air purifier

Abstract

This application discloses an air purifier, comprising: a housing with an air inlet on its side wall; and a filter element disposed within the housing, wherein an airflow channel is formed between the filter element and the inner wall of the housing, and the airflow channel is connected to the air inlet; wherein the air inlet is inclined vertically towards the dust collection box, forming an angle of 5°–85° with the horizontal direction. This cyclone air purifier can delay dust accumulation on the filter element, thereby extending the single-use life of the filter element and reducing the need for frequent cleaning or replacement of the filter element.

Description

Technical Field

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

[0002] Currently, air purifiers typically use an air intake scheme with pores in the side wall of the outer casing to allow outside air to directly enter the air purifier and be filtered by the filter element.

[0003] Due to factors such as direct air intake and electrostatic adsorption, dirt can accumulate on the filter element. As the usage time increases, the filter element's adsorption capacity decreases, requiring users to clean or replace the filter element frequently. This not only increases maintenance costs but also reduces the user experience.

[0004] Therefore, how to delay the accumulation of dust on the filter element is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide an air purifier that can delay the accumulation of dust on the filter element, thereby extending the single-use time of the filter element and inhibiting frequent cleaning or replacement of the filter element.

[0006] To achieve the above objectives, this application provides an air purifier, comprising:

[0007] The housing has an air inlet on its side wall;

[0008] A filter element is disposed in the housing, and an airflow channel is provided between the filter element and the inner wall of the housing, the airflow channel being connected to the air inlet;

[0009] The air inlet has an angle of 5°-85° with the horizontal direction.

[0010] Optionally, at least two adjacent air inlets are arranged at the same height on the side wall of the housing.

[0011] Optionally, the airflow channel is an annular channel, and there are multiple air inlets. The multiple air inlets are evenly arranged along the circumference of the housing, and the component of the air inlet direction on the radial surface of the filter element is opposite to the radial direction of the filter element.

[0012] Optionally, the side wall of the housing is provided with an air guide hood, the air inlet is opened in the air guide hood, and the air guide hood has an air guide channel that guides the airflow into the airflow channel along the air inlet direction;

[0013] The extension line of the air guide channel, which extends along the air inlet direction near the side of the housing, is tangent to the surface of the filter element, or is spaced apart from the surface of the filter element.

[0014] Optionally, there may be multiple air inlets, with at least two air inlets arranged axially on the housing, and the air inlets and the filter having an overlapping area in the horizontal direction.

[0015] Optionally, the filter element has a filter cavity, and the airflow of the airflow channel enters the filter cavity through the ventilation section of the filter element.

[0016] Optionally, it also includes an air outlet and a fan assembly disposed in the housing;

[0017] The air outlet is located at the upper part of the housing;

[0018] The air inlet side of the filter element is connected to the airflow channel, and the fan assembly connects the air outlet and the air outlet side of the filter element to create an air path from the air inlet to the air outlet.

[0019] Optionally, the filter element has a first bracket at its upper end, the outer periphery of the first bracket extends toward the housing and is fixedly sealed with the housing, and the first bracket seals and covers the upper end of the filter element, and the filter element is detachably connected to the first bracket or the housing.

[0020] Optionally, the fan assembly is fixedly mounted on the first bracket, and the first bracket has a vent that communicates with the air outlet side of the filter element. The fan assembly communicates with the air outlet side of the filter element through the vent.

[0021] Optionally, the filter element is provided with a second bracket at its lower end, and the second bracket seals and covers the lower end of the filter element.

[0022] Optionally, it also includes a dust collection box and a dust baffle ring. The dust collection box is detachably located at the bottom of the housing. The dust baffle ring is located at the second end of the filter element facing the dust collection box. The outer periphery of the dust baffle ring extends toward the housing. The dust baffle ring has multiple through holes that connect the airflow channel and the dust collection box.

[0023] The beneficial effect of this application is that the airflow enters the airflow channel between the housing and the filter element through the air inlet, and then passes through the filter element. The filter element filters out impurities in the air, which are then trapped on the filter element, thus contributing to air cleanliness. The airflow direction through the air inlet is inclined downwards in the vertical direction, and the inclination angle is 5°-85° with the horizontal direction. This gives the airflow in the airflow channel a downward component, which can push the impurities accumulated on the surface of the filter element, promoting the separation of impurities from the filter element and thus delaying the accumulation of dust on the filter element. The separated impurities, based on the inclined air inlet, can move downwards in the airflow channel and are eventually collected at the bottom of the housing, which helps to effectively separate impurities from the filter element, thereby extending the service life of the filter element. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the front structure of an air purifier provided in an embodiment of this application;

[0026] Figure 2 This is a three-dimensional structural diagram of an air purifier provided in an embodiment of this application;

[0027] Figure 3 for Figure 1 Sectional view along line AA in the middle;

[0028] Figure 4 This is a schematic diagram of the filter element structure provided in the embodiments of this application;

[0029] Figure 5 for Figure 1 BB-direction sectional view in the middle;

[0030] Figure 6 This is an exploded view of the filter element, the first support, and the second support provided in the embodiments of this application;

[0031] Figure 7 This is a schematic diagram showing the component of the air inlet direction on the radial surface of the filter element, as provided in the embodiments of this application.

[0032] In the diagram: 1-Housing; 2-Dust collection box; 3-Fan assembly; 4-First bracket; 5-Filter element; 6-Second bracket; 7-Dust baffle ring; 8-Filter inner cavity; 9-Airflow channel;

[0033] 11-Air inlet; 12-Air outlet; 13-Air guide cover;

[0034] 41 - Ventilation opening;

[0035] 71 - Through hole. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] It should be noted that in this embodiment, the orientation or positional relationship indicated by terms such as "upper," "lower," "front," and "rear" is based on the orientation or positional relationship shown in the accompanying drawings. It is used only for the convenience of describing this application and for simplifying the description, and does 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, it should not be construed as a limitation of this application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 and Figure 2 As shown, in this embodiment, an air purifier is provided, which includes a housing 1 and a filter 5. The housing 1 is provided with an air inlet 11 and an air outlet 12. The housing 1 serves as the exterior part of the air purifier and can provide structural support and protection for the working parts of the air purifier (such as the fan assembly 3, the filter 5, the dust collection box 2, etc.).

[0040] The air inlet 11 is located on the side wall of the housing 1. The air inlet 11 can be an air intake hole on the housing 1, which can be a single hole of a larger size or multiple holes of a smaller size, as long as it can meet the air volume requirements. Alternatively, a cover structure with a certain protruding shape can be formed on the housing 1. The cover structure is an integral structure with the housing 1, and a cavity structure is formed inside the cover structure. The cavity structure is connected to the inside of the housing 1, and at the same time, the cavity structure is connected to the outside of the housing 1 through the air inlet 11, so that the outside air enters the housing 1 after being guided by the cover structure. It should be noted that the formation of the air inlet 11 includes, but is not limited to, the above-mentioned methods, as long as it is conducive to the airflow entering the inside of the housing 1 through the air inlet 11, all of which fall within the protection scope of this application.

[0041] Furthermore, the air inlet 11 can be a channel structure with a certain extension. For example, when the air inlet 11 is an air inlet hole opened on the side wall of the housing 1, the air inlet hole should have a certain extension length along its axial direction, so as to provide a stable air intake direction for the airflow. Alternatively, when the air inlet 11 is set on the cover structure, the cavity structure of the cover structure can have a certain extension, so as to use the extension length of the cavity structure to guide the airflow, thereby giving the airflow a stable air intake direction.

[0042] The filter element 5 is disposed in the housing 1. The housing 1 can be a hollow columnar structure. The filter element 5 (filter cartridge) can be of various shapes, such as a regular structure like a columnar or conical structure, or a structure with an irregular cross-section. The housing 1 surrounds the outer periphery of the filter element 5. An airflow channel 9 is provided between the inner wall of the housing 1 and the filter element 5. The air inlet 11 connects the outside of the housing 1 with the airflow channel 9, so that when air enters the interior of the housing 1 through the air inlet 11, it first enters the airflow channel 9.

[0043] A dust collection box 2 is provided at the bottom of the housing 1. The dust collection box 2 has a cavity structure inside, which can be used to collect dust. The top of the dust collection box 2 has an opening, which facilitates the connection between the dust collection box 2 and the airflow channel 9. The dust in the airflow channel 9 can move towards the dust collection box 2 under the action of gravity or airflow, which helps to accelerate the settling of particulate matter and finally collect it in the dust collection box 2.

[0044] Based on this, the airflow entering the airflow channel 9 through the air inlet 11 has a certain airflow direction and airflow velocity, and the airflow direction and airflow velocity are consistent. Furthermore, the airflow direction of the air inlet 11 is inclined towards the dust collection box 2 in the vertical direction. Since the dust collection box 2 is located at the bottom of the housing 1, the windward side of the air inlet 11 is at a high position, and the air outlet side of the air inlet 11 is at a low position. This results in the airflow having a velocity component in the vertical direction after entering the airflow channel 9. This component can be used to make the airflow in the airflow channel 9 tend to move towards the dust collection box 2.

[0045] Furthermore, the tilt angle of the air inlet 11 is 5°-85° with the horizontal direction. Please refer to [reference needed]. Figure 1 With α ≤ 5° ≤ α ≤ 85°, the airflow in the airflow channel 9 has a directional component toward the dust collection box 2, which allows the airflow to push the impurities accumulated on the surface of the filter element 5, promoting the separation of impurities from the filter element 5, thereby delaying the accumulation of dust on the filter element 5; the separated impurities, based on the inclined setting of the air inlet 11, can move toward the dust collection box 2 in the airflow channel 9, and are finally collected in the dust collection box 2, which helps to effectively separate impurities from the filter element 5, thereby extending the service life of the filter element 5.

[0046] In addition, larger impurities, such as hair, are more easily detached from the surface of the filter element 5 by the airflow and are accelerated into the dust collection box 2. The dust collection box 2 is detachable from the housing, which facilitates the cleaning of impurities in the dust collection box and improves cleaning and maintenance efficiency.

[0047] At the same time, the airflow in the airflow channel 9 has not only a velocity component toward the dust collection box 2, but also a velocity component toward the filter element 5, so that the airflow can pass through the filter element 5. The filter element 5 filters out the impurities in the air and accumulates on the filter element 5, which helps to clean the air.

[0048] At least two adjacent air inlets 11 are arranged at the same height on the side wall of the housing 1, and the air inlet 11 is inclined towards the dust collection box 2 in the vertical direction and forms an angle of 5°-85° with the horizontal direction.

[0049] It can be seen that there can be multiple air inlets 11. Multiple air inlets 11 are arranged in a ring around the housing 1. When at least two adjacent air inlets 11 are arranged at the same height, the dust-laden airflow can enter the airflow channel 9 at a uniform speed, thus suppressing the situation of excessive local flow velocity or airflow turbulence.

[0050] The airflow channel 9 is an annular channel, meaning the gap between the housing 1 and the filter element 5 is uniform in the circumference of the filter element 5. For example, the housing 1 can be a cylindrical structure with an inner diameter larger than the outer diameter of the filter element 5, and it can be coaxially arranged with the filter element 5. This provides the most uniform airflow possible in the circumference of the filter element 5, allowing airflow to enter the filter element 5 evenly and reducing localized dust accumulation. It also makes the airflow smoother, reducing airflow stagnation caused by abrupt changes in the cross-sectional area of ​​the flow channel or the angle of the inner wall of the housing 1, which would affect the airflow velocity.

[0051] Please refer to Figure 7 The component of the air inlet 11 on the radial surface of the filter element 5 (which can also be called the "radial plane" or "plane containing the axis") is opposite to the radial direction of the filter element 5. That is, the airflow direction after passing through the air inlet 11 is inclined in the circumferential direction, rather than flowing vertically into the filter element 5 in the radial direction. Subsequently, the airflow forms a cyclone diffusion in the airflow channel 9 between the housing 1 and the filter element 5. Debris impacts the inner wall of the housing 1 under the action of centrifugal force, which helps the debris to stay on the housing 1 and fall off, thereby helping to purify the air and reduce the accumulation of debris in the filter element 5.

[0052] In addition, multiple air inlets 11 can be evenly distributed around the circumference of the housing 1, or at least two air inlets 11 can be distributed along the axial direction of the housing 1, that is, at least two air inlets 11 have different heights, one air inlet 11 is close to the first axial end of the filter element 5, and the other air inlet 11 is close to the second axial end of the filter element 5. The first axial end of the filter element 5 is the end away from the dust collection box 2, and the second axial end of the filter element 5 is the end close to the dust collection box 2.

[0053] The air inlet 11 near the first end of the filter element 5 is the upper air inlet 11, and the air inlet 11 near the second end of the filter element 5 is the lower air inlet 11. The opening area of ​​the upper air inlet 11 is larger than that of the lower air inlet 11, which results in a larger airflow and stronger air pressure at the upper air inlet 11. While increasing the airflow, the airflow at the upper air inlet 11 can be effectively diffused downward through the air pressure difference, improving airflow stagnation, thereby increasing the flow rate, improving cyclone intensity and diffusion efficiency.

[0054] Furthermore, the air inlet 11 and the filter element 5 have an overlapping area in the horizontal direction, which is conducive to airflow so that at least part of the airflow can directly act on the outer wall of the filter element 5, so that the airflow can directly push the impurities accumulated on the surface of the filter element 5, promote the separation of impurities from the filter element 5, and thus delay the accumulation of dust on the filter element 5.

[0055] In some embodiments, for multiple air inlets 11 distributed at the same height, the distance between the air inlet 11 and the first end of the filter element 5 in the axial direction is less than the distance between the air inlet 11 and the second end of the filter element 5 in the axial direction. For example, the air inlet 11 can correspond to the first end of the filter element 5, or the air inlet 11 extends to correspond to the first end of the filter element 5. The airflow from the air inlet 11 will diffuse towards the second end of the filter element 5, where the air pressure is lower, thereby forming a cyclone that moves around the filter element 5 circumferentially and toward the second end of the filter element 5. This helps to allow air to enter the filter element 5 over a larger area, while also pushing the debris accumulated on the surface of the filter element 5 toward the second end of the filter element 5, thereby causing the debris to move toward the dust collection box 2, improving the separation effect and facilitating the collection of debris.

[0056] The housing 1 can be a cylindrical structure with a smooth outer circumference, and the air inlet 11 can be an air intake hole on the housing. However, such an arrangement requires the housing 1 to have sufficient wall thickness to ensure that the air inlet 11 has sufficient length to stabilize the air intake direction at the air inlet 11. To help reduce the weight of the sidewalls of the housing 1, a cover structure can also be provided to provide the air inlet 11.

[0057] Specifically, an air guide shroud 13 is provided on the side wall of the housing 1. The air guide shroud 13 is the shroud structure mentioned above. The air inlet 11 is opened on the air guide shroud 13. Please refer to [reference needed]. Figure 1 and Figure 2 The air guide shroud 13 has an air guide channel that guides airflow into the airflow channel 9 along the air inlet direction; and the extension line a (extension line a can be the center line of the air guide channel outlet or a line parallel to the center line) extending along the air inlet direction near the side of the housing 1 is tangent to the surface of the filter element 5, or is spaced apart from the surface of the filter element 5. Please refer to [reference needed]. Figure 5 .

[0058] When the extension line a is tangent to the surface of the filter element 5, the airflow sweeps across the sidewall of the filter element 5 in a direction approximately tangent to it. This improves the pushing effect on debris on the outer wall of the filter element 5, making it easier for the debris to detach. Furthermore, it significantly increases the speed of the airflow moving circumferentially around the filter element 5, which helps to create a cyclone over a larger area. This allows the debris carried by the airflow to be separated by impacting the inner wall of the housing 1 under centrifugal force, thus improving the problem of rapid localized dust accumulation in the filter element 5.

[0059] When the extension line a is spaced from the surface of the filter element 5, the airflow will not directly act on the outer wall of the filter element 5 after passing through the air inlet 11, and the airflow velocity will not be affected by the filter element 5. This allows the airflow to form a higher speed cyclone in the airflow channel 9. The high-speed airflow forming the cyclone is used to separate impurities from the outer wall of the filter element 5 and the inner wall of the housing 1, thereby improving the problem of dust accumulation in the filter element 5 and the housing 1.

[0060] Furthermore, the air inlets 11 located at the same height can be rotationally symmetrical about the axis, that is, the included angle of the air intake direction of each air inlet 11 is the same, which helps to provide a more uniform cyclone on the outer periphery of the filter element 5; of course, the included angle of the air intake direction of different air inlets 11 can also be different, such as only the extension line a of some air inlets 11 is tangent to the side wall of the filter element 5, and the extension line a of other air inlets 11 is spaced apart from the side wall of the filter element 5.

[0061] Please refer to Figure 3 and Figure 6 The filter element 5 may have a filter cavity 8, meaning the filter element 5 is constructed as a cavity structure. The filter element 5 can be a filter cartridge, which can be a hollow cylindrical structure formed by materials such as activated carbon composite layers or electrostatic adsorption filter media. The filter element 5 may have a multi-layer pleated structure, which can increase the effective filtration area, improve dust holding capacity, and simultaneously reduce the air resistance of the filter element 5, thereby improving airflow efficiency. The airflow through the airflow channel 9 can enter the filter cavity 8 through the ventilation section of the filter element 5, thus aiding in the filtration of impurities in the air. The ventilation section refers to the effective cross-sectional area of ​​the airflow filter element 5.

[0062] The air purifier also includes an air outlet 12 located on the housing 1 and a fan assembly 3. Please refer to... Figure 2 and Figure 3 The air outlet 12 is located at the upper part of the housing 1. Specifically, the air outlet 12 can be located at the top or upper side wall of the housing 1, without much restriction. The air inlet side of the filter element 5 is connected to the airflow channel 9. The fan assembly 3 can connect the air outlet side (filter cavity 8) of the filter element 5 and the air outlet 12. Thus, under the negative pressure of the fan assembly 3, the airflow enters the filter cavity 8 (air outlet side of the filter element 5) from the air inlet side of the filter element 5 and flows to the fan assembly 3.

[0063] In this embodiment, the filter element 5 can be a plate-shaped filter element 5 without a filter cavity, or a filter element 5 of other shapes; while in the filter element 5 with a filter cavity 8, the position of the filter cavity 8 is equivalent to the air outlet side of the filter element 5. Therefore, this embodiment will be described in terms of the filter cavity 8 instead of the air outlet side of the filter element 5. Since the airflow moves along the outside of the filter element 5 to the filter cavity 8, the impurities in the airflow will be concentrated on the outer wall of the filter element 5. When it is necessary to clean the filter element 5, since the impurities are accumulated on the outer wall of the filter element 5, it is easier to clean the filter element 5.

[0064] The filter element 5 can be a hollow cylindrical structure, and the airflow channel 9 is an annular channel, which allows air to enter the filter cavity 8 evenly around the outer periphery of the filter element 5, which is beneficial to achieving a high filtration effect at any position on the filter element 5.

[0065] A first bracket is provided at the upper end of the filter element 5, that is, a first bracket 4 is provided at the first end of the filter element 5 facing the air outlet 12. Please refer to [reference needed]. Figure 3 , Figure 4 and Figure 6 The outer edge of the first bracket 4 can extend toward the housing 1 and be fixedly sealed with the housing 1, so that the airflow channel 9 is located at one end of the first bracket 4 to form a closed structure. This is beneficial because the air in the airflow channel 9 cannot move directly to the air outlet 12, but instead enters the filter inner cavity 8 through the filter element 5, or moves toward the dust collection box 2.

[0066] The first support 4 is sealed to the first end of the filter element 5. The first support 4 has a certain limiting effect on the filter element 5 in the circumferential direction, which can maintain the structural shape of the filter element 5 and prevent the filter element 5 from deforming under the impact of airflow. Under the sealing effect of the first support 4, air can be prevented from flowing out directly from the first end of the filter element 5, so that air can only enter the filter cavity 8 through the ventilation section of the filter element 5, which is beneficial to the filtration effect of the filter element 5.

[0067] The fan assembly 3 can be fixed on the first bracket 4. The first bracket 4 is provided with a vent 41 that communicates with the filter inner cavity 8. The fan assembly 3 can communicate with the filter inner cavity 8 through the vent 41. The fan assembly 3 is provided with a fan wheel. When the fan wheel rotates, it can generate negative pressure suction, thereby creating an air path from the air inlet 11 to the air outlet 12. Air outside the housing 1 is drawn into the air inlet 11 and flows along the air path to the air outlet 12. After filtration, it is discharged from the air outlet 12.

[0068] The lower end of the filter element 5 is provided with a second space, that is, the second end of the filter element 5 facing the dust collection box 2 is provided with a second support 6. The second support 6 seals and covers the second end of the filter element 5 and the filter inner cavity 8. Under the sealing effect of the second support 6, the gas in the filter inner cavity 8 will not move towards the dust collection box 2, nor will it move towards the dust collection box 2 through the second end of the filter element 5.

[0069] Please refer to Figure 3 , Figure 4 and Figure 6 The air purifier also includes a dust baffle ring 7, which is located at the second end of the filter 5 facing the dust collection box 2. It can be detachably fixed to the second bracket 6. Alternatively, the outer periphery of the dust baffle ring 7 extends toward the housing 1 and is fixedly connected to the housing 1, thereby facilitating the fixed installation of the dust baffle ring 7.

[0070] Multiple through holes 71 are provided on the dust baffle ring 7 to connect the airflow channel 9 and the dust collection box 2, which facilitates the entry of impurities into the dust collection box 2 through the through holes 71; or the dust baffle ring 7 may have a certain gap with the inner wall of the housing 1, so that impurities can enter the dust collection box 2 through the gap.

[0071] The dust collection box 2 is detachably connected to the housing 1. The connection methods between the dust collection box 2 and the housing 1 include, but are not limited to, snap-fit, hook-fit, threaded connection, clamp connection, plug-in, magnetic attraction and adhesive, etc., which makes it easy to remove and clean the dust collection box 2 and clean it separately.

[0072] In the direction from the air outlet 12 to the dust collection box 2, the diameter of the through hole 71 gradually decreases, or the gap between the dust baffle ring 7 and the housing 1 gradually decreases. Impurities can enter the dust collection box 2 through the through hole 71 or the gap under the action of the airflow in the airflow channel 9. However, since the through hole 71 and the gap are gradually narrowing, they can hinder the upward movement of dust in the dust collection box 2, inhibiting the dust from reaching the airflow channel 9 again and re-accumulating on the filter element 5.

[0073] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0074] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An air purifier, characterized in that, include: The housing (1) has an air inlet (11) on its side wall. A filter element (5) is disposed in the housing (1), and an airflow channel (9) is provided between the filter element (5) and the inner wall of the housing (1), and the airflow channel (9) is connected to the air inlet (11). The air inlet (11) has an air intake direction that forms an angle of 5°-85° with the horizontal direction.

2. The air purifier according to claim 1, characterized in that, At least two adjacent air inlets (11) are arranged around the side wall of the housing (1) at the same height.

3. The air purifier according to claim 1, characterized in that, The airflow channel (9) is an annular channel, and there are multiple air inlets (11). The multiple air inlets (11) are evenly arranged around the circumference of the housing (1). The air inlet direction of the air inlet (11) is the component on the radial surface of the filter element (5), which is opposite to the radial direction of the filter element (5).

4. The air purifier according to claim 1, characterized in that, The side wall of the housing (1) is provided with an air guide hood (13), the air inlet (11) is opened on the air guide hood (13), and the air guide hood (13) has an air guide channel that guides the airflow into the airflow channel (9) along the air inlet direction. The extension line of the air guide channel extending along the air inlet direction near the side of the housing (1) is tangent to the surface of the filter element (5), or is spaced apart from the surface of the filter element (5).

5. The air purifier according to claim 1, characterized in that, There are multiple air inlets (11), with at least two air inlets (11) arranged axially on the housing (1), and the air inlets (11) and the filter element (5) having an overlapping area in the horizontal direction.

6. The air purifier according to claim 1, characterized in that, The filter element (5) has a filter cavity (8), and the airflow of the airflow channel (9) enters the filter cavity (8) through the ventilation section of the filter element (5).

7. The air purifier according to claim 1, characterized in that, It also includes an air outlet (12) and a fan assembly (3) provided in the housing (1); The air outlet (12) is located at the upper part of the housing (1); The air inlet side of the filter element (5) is connected to the airflow channel (9), and the fan assembly (3) is connected to the air outlet (12) and the air outlet side of the filter element (5) to generate an air path from the air inlet (11) to the air outlet (12).

8. The air purifier according to claim 7, characterized in that, The filter element (5) is provided with a first bracket (4) at its upper end. The outer periphery of the first bracket (4) extends toward the housing (1) and is fixedly sealed with the housing (1). The first bracket (4) seals and covers the upper end of the filter element (5). The filter element (5) is detachably connected to the first bracket (4) or the housing (1).

9. The air purifier according to claim 8, characterized in that, The fan assembly (3) is fixedly mounted on the first bracket (4). The first bracket (4) has a vent (41) that communicates with the air outlet side of the filter element (5). The fan assembly (3) communicates with the air outlet side of the filter element (5) through the vent (41).

10. The air purifier according to claim 1, characterized in that, The filter element is provided with a second bracket (6) at its lower end, and the second bracket (6) seals and covers the lower end of the filter element (5).

11. The air purifier according to claim 1, characterized in that, It also includes a dust collection box (2) and a dust baffle ring (7). The dust collection box (2) is detachably located at the bottom of the housing (1). The dust baffle ring (7) is located at the end of the filter element (5) facing the dust collection box (2). The outer periphery of the dust baffle ring (7) extends toward the housing (1). The dust baffle ring (7) has multiple through holes (71) that connect the airflow channel (9) and the dust collection box (2).

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