Air cleaner and filter element

Abstract

The application discloses an air purifier, comprising: a casing, comprising an air inlet and an air outlet; a fan assembly arranged in the casing, the fan assembly being used for generating an air path from the air inlet to the air outlet; a first filter arranged in the casing and located in the air path; and a second filter, which is detachably arranged in the casing or the first filter, has flexibility and air permeability, is located in the air path between the air inlet and the first filter, and has a filtering precision lower than that of the first filter. The air purifier can preliminarily filter impurities in air by the second filter, avoid excessive accumulation of the impurities on the first filter, and improve the cleanliness and service life of the first filter.

Description

[0001] This application claims priority to Chinese Patent Application No. 202520800556.2, filed on April 24, 2025, entitled "Air Purifier", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of air purification technology, and in particular to an air purifier and filter. Background Technology

[0003] 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.

[0004] Because air passes directly through the filter, dust, particles, and hair easily accumulate on the filter surface. As the usage time increases, the filter's adsorption capacity decreases, and users need to clean or replace the filter frequently. Cleaning the filter requires the use of a vacuum cleaner or a brush, which is quite difficult, and replacing the filter will increase the user's operating costs.

[0005] Therefore, how to reduce the frequency of cleaning and replacing filter elements is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this application is to provide an air purifier and filter element that allows the second filter element to initially filter impurities in the air, preventing excessive accumulation of impurities on the first filter element and improving the cleanliness and service life of the first filter element.

[0007] To achieve the above objectives, this application provides an air purifier, comprising:

[0008] The casing includes the air inlet and the air outlet;

[0009] A fan assembly is disposed in the housing, and the fan assembly is used to generate an air path from the air inlet to the air outlet;

[0010] The first filter element is disposed in the housing and located in the air duct;

[0011] The second filter element is detachably disposed on the housing or the first filter element. The second filter element is flexible and breathable. The second filter element is located in the air path between the air inlet and the first filter element. The filtration accuracy of the second filter element is less than that of the first filter element.

[0012] A filter element, used in an air purifier, comprising:

[0013] The first filter element is installed at the main filter position in the air purifier's airflow path;

[0014] The second filter element, installed on the air inlet side of the first filter element, is flexible and breathable;

[0015] The filtration accuracy of the second filter element is less than that of the first filter element.

[0016] Optionally, the second filter element has an air inlet that communicates with the air intake.

[0017] Optionally, the housing includes:

[0018] The housing contains the first filter element and the second filter element.

[0019] An air inlet shroud is detachably connected to the housing. The air inlet shroud has an air inlet, and the air inlet of the second filter element is directly connected to the air inlet and sealed.

[0020] Optionally, in the direction from the air inlet to the air outlet, the second filter, the first filter, and the fan assembly are arranged sequentially.

[0021] Optionally, the second filter element is spaced apart from the first filter element, and the diameter of the second filter element gradually increases in the direction from the air inlet to the air outlet.

[0022] Optionally, the bottom of the housing is provided with a partition, the inner side of the partition forms a receiving groove in the air passage, the second filter element is placed in the receiving groove, an air inlet channel is formed between the outer side of the partition and the housing, and a plurality of air inlet holes are opened on the housing corresponding to the air inlet channel;

[0023] The air inlet hood has a cavity, one side of which is connected to the second filter element. The air inlet includes a first air inlet located on the side of the air inlet hood away from the second filter element, and a second air inlet located on both sides of the air inlet hood. The first air inlet is used to connect the cavity to the outside of the housing, and the second air inlet connects the cavity to the air inlet channel.

[0024] Optionally, the number of air inlet hoods may be one or more, and the plurality of air inlet hoods may be distributed circumferentially along the bottom of the housing.

[0025] Optionally, an airflow channel is formed between the first filter element and the inner wall of the housing, and the airflow in the air path enters the airflow channel after passing through the second filter element.

[0026] Optionally, the second filter element is connected to the first end of the airflow channel, the second end of the airflow channel is closed, and the air inlet side of the ventilation section of the first filter element is connected between the first end and the second end of the airflow channel.

[0027] Optionally, the first filter element is provided with a first bracket at its first end facing the air inlet, the first bracket sealingly covering the first end of the first filter element, and there is a gap between the first bracket and the housing to connect the second filter element and the first end of the airflow channel;

[0028] The first bracket is provided with a support member, which is distributed between the second filter element and the first filter element.

[0029] Optionally, the first filter element is provided with a second bracket at its second end facing the air outlet. The second bracket seals and covers the second end of the first filter element. The outer edge of the second bracket extends toward the housing and is sealed to the housing to form a closed second end of the airflow channel.

[0030] Optionally, the second bracket is provided with a vent that communicates with the air outlet side of the ventilation section of the first filter element, and the fan assembly communicates with the ventilation section of the first filter element through the vent.

[0031] Optionally, the first filter and the second filter are not at the same height along the vertical direction of the air purifier.

[0032] The beneficial effects of this application are that the second filter element is located in the air path between the air inlet and the first filter element. The first filter element performs preliminary filtration, and the filtration precision of the second filter element is lower than that of the first filter element, allowing larger pollutants to be intercepted and collected. The airflow filtered by the second filter element then re-enters the first filter element for further filtration, reducing the contamination load on the first filter element and effectively extending its service life while reducing the need for cleaning and replacement. Furthermore, the second filter element is detachably mounted on the housing or the first filter element. After the second filter element has absorbed a certain amount of impurities, it can be directly removed and replaced with a new one, avoiding dust generation during cleaning. Attached Figure Description

[0033] 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.

[0034] Figure 1 This is a schematic diagram of an air purifier structure provided in an embodiment of this application;

[0035] Figure 2 for Figure 1 Sectional view along line AA;

[0036] Figure 3 This is a schematic diagram of the structure of the first filter element, the first support, and the second support provided in the embodiments of this application;

[0037] Figure 4 Exploded views of the first filter element, the first support, and the second support provided in the embodiments of this application;

[0038] Figure 5 This is a schematic diagram of another air purifier structure provided in an embodiment of this application;

[0039] Figure 6 for Figure 5 Sectional view along the BB direction;

[0040] Figure 7 This is a schematic diagram showing the second filter element relative to the housing provided in the embodiments of this application;

[0041] Figure 8 This is a schematic diagram of the assembly structure of the first filter element, the first bracket, and the second bracket provided in the embodiments of this application;

[0042] Figure 9 This is a partial cross-sectional view of the air inlet shroud and housing after assembly, as provided in an embodiment of this application.

[0043] In the diagram: 1-Casing; 2-First filter element; 3-Second filter element; 4-First bracket; 5-Filter inner cavity; 6-Airflow channel; 7-Second bracket; 8-Fan assembly; 9-Baffle plate;

[0044] 11-Air inlet; 12-Air outlet; 13-Air inlet cover; 14-Housing shell; 15-Air inlet hole;

[0045] 41-Supporting component;

[0046] 71 - Ventilation opening;

[0047] 91-Accommodation slot; 92-Air inlet channel;

[0048] 111 - First air inlet; 112 - Second air inlet;

[0049] 131-Cavity. Detailed Implementation

[0050] 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 of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] 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.

[0052] 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.

[0053] like Figure 1 As shown, in this embodiment, an air purifier is provided, which includes a housing 1. The housing 1 is provided with an air inlet 11 and an air outlet 12. The housing 1 serves as the exterior component of the air purifier and can provide structural support and protection for the working components of the air purifier (such as the fan assembly 8, the first filter element 2, the second filter element 3, etc.).

[0054] like Figure 2 As shown, the air purifier also includes a fan assembly 8, which is disposed inside the housing 1 and fixed relative to the housing 1. The fan assembly 8 contains a fan wheel, which generates negative pressure suction when rotating, thus creating an airflow path from the air inlet 11 to the air outlet 12. Air from outside the housing 1 is drawn into the air inlet 11 and flows along this airflow path towards the air outlet 12, and is discharged from the air outlet 12 after filtration.

[0055] The air purifier also includes a first filter element 2, which can be a filter cartridge. The first filter element 2 is disposed inside the housing 1 and located in the aforementioned air duct, allowing air to pass through the first filter element 2 for filtration. The first filter element 2 is fixedly disposed relative to the housing 1, thereby giving the first filter element 2 structural stability when airflow passes through it.

[0056] The air purifier also includes a second filter element 3, which is detachably mounted on the housing 1 or the first filter element 2. After the second filter element 3 is mounted on the housing 1 or the first filter element 2, it can be fixed relative to the housing 1 to ensure the stability of the second filter element 3.

[0057] The second filter element 3 is flexible and can be made of filter cotton, activated carbon, or non-woven fabric. Alternatively, it can be made of metal, such as a flexible metal mesh. The metal mesh is durable and reusable, effectively removing accumulated pollutants through simple rinsing with water or backflushing with air, allowing for multiple cycles of use.

[0058] The second filter element 3 can be made of flexible nonwoven fabric produced from fine fibers such as polyester (PET), polypropylene (PP), or special elastic polymers through processes such as meltblowing, spunbonding, electrospinning, or hydroentangling. To further enhance flexibility and tear resistance, elastic fibers (such as spandex filaments) can be incorporated into the filter layer, or a thin and flexible support layer (such as a very thin spunbond nonwoven fabric or microporous membrane) can be laminated to the outer / inner layer. The body of the second filter element 3 abandons the rigid skeleton design, utilizing the inherent flexibility of the material itself to allow it to be freely bent and folded. Preferably, the second filter element 3 is designed with a multi-layered pleated structure, which provides a larger filtration area when unfolded and is easy to store and maintain flexibility when folded. The inlet flange or mounting interface of the second filter element 3 can be made of elastomeric materials (such as silicone or TPE) or specially treated flexible plastics, so that the second filter element 3 can serve as a flexible filtration structure for the dust collection bag, making it easy to fit tightly into the purifier inlet while also possessing a certain degree of elastic deformation capability. When subjected to external pressure, folding, or impact, the dust bag exhibits excellent wrinkle resistance and resilience, is not prone to permanent deformation or damage, and is easy to transport, store, and replace.

[0059] The flexible second filter element 3 can be bent or deformed to better adapt to the internal spatial structure of the air purifier. Furthermore, after being separated from the housing 1, the flexible second filter element 3 is easier to wash and clean. Additionally, the second filter element 3 can be a breathable dust collection bag; breathability refers to the airflow through a unit area of ​​filter material per unit time under specific pressure differential conditions. The dust collection bag can be made of non-woven fabric, specialty paper, or other fabrics. Dust collection bags made of non-woven fabric or other fabrics are less expensive and can be discarded after single use, eliminating the need for user cleaning of the second filter element 3 and improving the convenience of air purifier maintenance.

[0060] After the airflow enters the second filter element 3, it will fill the second filter element 3. The air pressure generated by the airflow can cause the second filter element 3, made of flexible material, to be stretched and automatically expanded, thereby accommodating more pollutants.

[0061] Furthermore, the second filter element 3 is located in the airflow path between the air inlet 11 and the first filter element 2. This means that the airflow entering from the air inlet 11 first passes through the second filter element 3 before entering the first filter element 2. The spatial relationship between the air inlet 11, the first filter element 2, and the second filter element 3 is not strictly defined. For example, the second filter element 3 can be located outside the first filter element 2, and the spatial relationship between the air inlet 11, the first filter element 2, and the second filter element 3 can be rationally arranged according to actual needs. In other words, the air flowing along this airflow path will first be filtered by the second filter element 3 and then by the first filter element 2.

[0062] One end of the second filter element 3 has an air inlet. The air inlet of the second filter element 3 faces the air inlet 11 of the housing 1, and the air inlet is sealed and connected to the air inlet 11, so that the air can completely enter the air inlet after passing through the air inlet 11, and then enter the second filter element 3 to achieve full filtration of the air.

[0063] As a preliminary filtration device, the filtration accuracy of the second filter element 3 is lower than that of the first filter element 2. In the field of filtration, a higher "filtration accuracy" value indicates a stronger ability to intercept particles (i.e., a smaller particle size that can pass through). After the airflow passes through the second filter element 3, larger pollutants such as dust, hair, and lint are adsorbed or collected by the second filter element 3. Smaller dust particles that the second filter element 3 fails to filter out are then further filtered by the first filter element 2, thereby reducing the filtration load on the first filter element 2. Therefore, the first filter element 2 does not need to be cleaned and replaced frequently, thus extending its service life.

[0064] In summary, in this embodiment, the second filter element 3 is located in the air path between the air inlet 11 and the first filter element 2. It undergoes preliminary filtration by the first filter element 2, and the filtration accuracy of the second filter element 3 is lower than that of the first filter element 2, allowing larger pollutants to be intercepted and collected by the second filter element 3. The airflow filtered by the second filter element 3 then enters the first filter element 2 for further filtration, reducing the contamination load on the first filter element 2 and effectively extending its service life while reducing the efficiency of cleaning and replacing it. Furthermore, the second filter element 3 is detachably mounted on the housing 1 or the first filter element 2. After the second filter element 3 has absorbed a certain amount of impurities, it can be directly removed and replaced with a new one, avoiding dust generation during cleaning.

[0065] It should be noted that the second filter element 3 can be detachably connected to the housing 1 or the first filter element 2 through magnetic connection, snap-on connection, plug-in connection, Velcro connection, etc., and the specific detachable form is not specifically limited.

[0066] This application also provides a filter element. A first filter element 2 is mounted on the main filtration position of the air purifier's airflow path using a rigid frame, forming a primary filtration barrier. A second filter element 3 is detachably mounted on the air inlet side of the first filter element 2. It is flexible and breathable, allowing deformation or vibration under airflow. The filtration accuracy of the second filter element 3 is less than that of the first filter element 2. The structural and positional relationship between the first filter element 2 and the second filter element 3, as well as other implementation methods, can be referred to the foregoing embodiments and will not be repeated here.

[0067] The housing 1 includes a housing 14 and an air inlet shroud 13. The housing 14 has a cavity inside for accommodating the first filter element 2, the second filter element 3, and the fan assembly 8, etc. The air inlet shroud 13 is detachably connected to the housing 14. The air inlet 11 is provided on the air inlet shroud 13, and the air inlet of the second filter element 3 is directly connected to the air inlet 11 and sealed to ensure that the air passing through the air inlet 11 can completely enter the second filter element 3.

[0068] It should be noted that the second filter element 3 can be detachably connected to the air inlet cover 13, or it can be detachably connected to other components, such as the housing 14 or the first filter element 2, to ensure that the second filter element 3 and the air inlet 11 are connected in the air path, or that the air inlet of the second filter element 3 and the air inlet 11 are connected in the air path. All of these fall within the protection scope of this application.

[0069] When it is necessary to replace or clean the second filter element 3, the air inlet cover 13 can be removed from the housing 14, and the second filter element 3 can be removed from the housing 1 or the first filter element 2, so as to conveniently replace or clean the second filter element 3.

[0070] It should be noted that, except for the air inlet, the other parts of the second filter element 3 are all closed structures with air-permeable filtration function, so that the second filter element 3 forms an inner cavity structure with an air inlet on one side. The pollutants adsorbed and collected by the second filter element 3 can be collected in the inner cavity of the second filter element 3. During the process of removing the second filter element 3 from the housing 1 or the first filter element 2, no secondary pollution or dust will be caused.

[0071] In one embodiment, the first filter element 2 and the second filter element 3 are located at different heights along the vertical direction of the air purifier. In other words, the second filter element 3 can be positioned above or below the first filter element 2. This reasonable height difference disperses airflow pressure and prevents uneven filtration caused by localized high-velocity areas. Simultaneously, the height difference design avoids interference between the second filter element 3 and the first filter element 2 during installation and removal, preventing contaminants from the second filter element 3 from falling off and accumulating on the first filter element 2, making maintenance more convenient and quicker.

[0072] When the second filter element 3 is located above the first filter element 2, the air inlet shroud 13 can be located on the upper part of the housing 14, and the corresponding air outlet 12 is located on the lower part of the housing 14. Please refer to [reference needed]. Figure 1 and Figure 2 Along the direction from the air inlet 11 to the air outlet 12, the second filter element 3, the first filter element 2, and the fan assembly 8 are arranged sequentially. The first filter element 2 and the second filter element 3 are located above the fan assembly 8, which allows the airflow entering from the air inlet 11 to be purified and filtered before being pressurized and accelerated for discharge by the fan assembly 8. In addition, placing the fan assembly 8 at the bottom of the housing 14 can lower the center of gravity of the air purifier, making the air purifier more stable.

[0073] The second filter element 3 is located above the first filter element 2, and the second filter element 3 is spaced apart from the first filter element 2 to avoid the second filter element 3 from sticking to the first filter element 2, which would affect the efficiency of air passing through the second filter element 3. Furthermore, in the direction from the air inlet 11 to the air outlet 12, the diameter of the second filter element 3 gradually increases, which can gradually increase the volume at the bottom of the second filter element 3, thereby gradually reducing the gas flow velocity inside the second filter element 3 and ensuring the filtration effect when the airflow passes through the second filter element 3.

[0074] The air inlet shroud 13 can be located on the upper wall or upper side wall of the housing 14, and the air outlet 12 can be located on the lower side wall or bottom wall of the housing 14. However, since the housing 1 is usually placed on the ground, in order to ensure that the air outlet 12 can discharge air smoothly, it is preferable to set the air outlet 12 on the lower side wall of the housing 14.

[0075] In another embodiment, please refer to Figure 5 and Figure 6 When the second filter element 3 is located at the lower part 2 of the first filter element, the air inlet hood 13 can be located at the lower part of the housing 14, and the corresponding air outlet 12 can be located at the upper part of the housing 14. In the direction from the air inlet 11 to the air outlet 12, the second filter element 3, the first filter element 2, and the fan assembly 8 are arranged in sequence. Similarly, the second filter element 3 and the first filter element 2 are spaced apart to avoid the second filter element 3 from being in contact with the first filter element 2. In the direction from the air inlet 11 to the air outlet 12, the diameter of the second filter element 3 gradually increases, so that the volume at the bottom of the second filter element 3 gradually increases.

[0076] Considering that placing the air inlet shroud 13 on the upper part of the housing 14 would make it inconvenient for the user to remove the shroud 13 due to the height of the housing 14, this application proposes to place the air inlet shroud 13 on the lower part of the housing 14. Specifically, the air inlet shroud 13 is located on the lower side wall of the housing 14, please refer to... Figure 7 and Figure 9A partition 9 is provided at the bottom of the housing 14. The partition 9 can be distributed circumferentially, so that the inner side of the partition 9 forms a receiving groove 91 in the air passage. At the same time, the second filter element 3 is placed in the receiving groove 91. Air enters the second filter element 3 through the air inlet 11 and is filtered by the second filter element 3. Then it can flow to the first filter element 2 through the receiving groove 91.

[0077] An air inlet channel 92 is formed between the outer side of the partition 9 and the inner wall of the housing 14. A plurality of air inlet holes 15 are provided on the housing 14 corresponding to the air inlet channel 92. Air outside the housing 14 can enter the air inlet channel 92 through the air inlet holes 15. Air in the air inlet channel 92 can enter the second filter element 3 through the air inlet cover 13, so that the air intake of the second filter element 3 is not limited to the air inlet 11, thereby improving the air intake and filtration efficiency of the air purifier.

[0078] Please refer to Figure 9 The air inlet shroud 13 has a cavity 131, one side of which is sealed and connected to the second filter element 3. The air inlet 11 includes a first air inlet 111 located on the side of the air inlet shroud 13 away from the second filter element 3, and a second air inlet 112 located on both sides of the air inlet shroud 13. The first air inlet 111 is located on the outer wall of the housing 14 and is used to connect the cavity 131 and the outside of the housing 14. The first air inlet 111 serves as the main air inlet. The second air inlet 112 can connect the cavity 131 and the air inlet channel 92, so that the airflow passing through the air inlet 11 can enter the cavity 131 and then flow from the cavity 131 into the interior of the second filter element 3.

[0079] Furthermore, there can be one or more air inlet hoods 13, distributed circumferentially along the housing 14, with the second filter element 3 corresponding to the air inlet hood 13 one by one; the air inlet hood 13 can be removed from the housing 14 by pulling it out, so as to conveniently replace or clean the second filter element 3.

[0080] Please refer to Figure 2 and Figure 6 The first filter element 2 can be a solid filter element such as a plate or column, ensuring it has a corresponding ventilation cross-section for filtration. The ventilation cross-section refers to the effective cross-section through which air flows through the first filter element 2, or the effective cross-section on the first filter element 2 that allows airflow to pass through for filtration. The first filter element 2 can also have a filter cavity 5, meaning the first filter element 2 is constructed as a cavity structure. The first filter element 2 can be a filter cartridge. The filter cartridge can be a hollow cylindrical structure formed by materials such as activated carbon composite layers or electrostatic adsorption filter media. The first filter element 2 can have a multi-layer folded structure, which can increase the effective filtration area, improve dust holding capacity, and at the same time reduce the air resistance of the first filter element 2, improving airflow efficiency.

[0081] Please refer to Figure 2 and Figure 6An airflow channel 6 is formed between the first filter element 2 and the inner wall of the housing 1. The airflow from the first filter element 2 can enter the airflow channel 6. The fan assembly 8 is in fluid communication with the air outlet side of the ventilation section of the first filter element 2. If the first filter element 2 has a filter cavity 5, the fan assembly 8 should be connected to the filter cavity 5, which also enables the fan assembly 8 to be connected to the air outlet side of the ventilation section of the first filter element 2. That is, the filter cavity 5 and the air outlet side of the ventilation section of the first filter element 2 are equivalent in position, and being connected to the filter cavity 5 indicates being connected to the air outlet side of the ventilation section of the first filter element 2.

[0082] The following description uses the example of the first filter element 2 having a filter cavity 5. The negative pressure generated by the fan assembly 8 causes the air in the airflow channel 6 to pass through the first filter element 2 and enter the filter cavity 5, thereby achieving the filtration of air by the first filter element 2. For example, Figure 2 and Figure 6 The dashed line in the figure shows the airflow filtration path of the air purifier in the embodiment of this application.

[0083] The fan assembly 8 connects the filter cavity 5 and the air outlet 12. Under the negative pressure of the fan assembly 8, the airflow passes through the ventilation section of the first filter element 2 from the outside and enters the filter cavity 5, flowing towards the fan assembly 8. Because the airflow moves along the outside of the first filter element 2 towards the filter cavity 5, smaller impurities in the airflow will concentrate on the outer wall of the first filter element 2. Even if the first filter element 2 needs to be cleaned, the accumulation of impurities on the outer wall of the first filter element 2 makes it easier to clean.

[0084] The first filter element 2 can be a hollow cylindrical or conical structure. There are no strict restrictions here, and the layout can be reasonably arranged according to the actual situation.

[0085] When the first filter element 2 is a cylindrical structure, the airflow channel 6 is an annular channel, which allows air to enter the filter cavity 5 evenly around the outer periphery of the first filter element 2, ensuring that there is a high filtration effect at any position on the first filter element 2.

[0086] When the first filter element 2 is a conical structure, the space of the airflow channel 6 can be increased, the airflow that the airflow channel 6 can accommodate can be increased, and the wind resistance and noise in the airflow channel 6 can be reduced.

[0087] Of course, the structure of the first filter element 2 includes, but is not limited to, the methods given above, as long as it has a filter cavity 5, which will not be described in detail here.

[0088] The second filter element 3 is connected to the first end of the airflow channel 6, the second end of the airflow channel 6 is closed, and the air inlet side of the ventilation section of the first filter element 2 is connected between the first end and the second end of the airflow channel 6, so that the airflow in the airflow channel 6 comes from the second filter element 3, and the airflow in the airflow channel 6 enters the filter cavity 5 through the ventilation section of the first filter element 2.

[0089] A first bracket 4 is provided at the first end of the first filter element 2 facing the air inlet 11. Please refer to... Figure 3 , Figure 4 and Figure 8 The first support 4 seals and covers the first end of the first filter element 2. When the first filter element 2 has a filter cavity 5, the first support 4 also seals and covers the filter cavity 5. The first support 4 has a certain limiting effect on the first filter element 2 in the circumferential direction, which can maintain the structural shape of the first filter element 2 and prevent the first filter element 2 from deforming under the impact of airflow. The first end of the first filter element 2 is located on the same side as the first end of the airflow channel 6, and the second end of the first filter element 2 is located on the same side as the second end of the airflow channel 6.

[0090] Meanwhile, through the sealing effect of the first bracket 4, the air filtered by the second filter element 3 will not directly enter the first filter element 2 from the first end and the filter cavity 5. Instead, the air filtered by the second filter element 3 will enter the filter cavity 5 from the outside of the first filter element 2 through the ventilation section of the first filter element 2, thereby ensuring the filtration effect of the first filter element 2 and allowing smaller impurities to concentrate on the outer wall of the first filter element 2.

[0091] In addition, there is a gap between the first bracket 4 and the housing 1 to connect the second filter 3 and the first end of the airflow channel 6, so that the airflow can enter the airflow channel 6 through the gap after passing through the second filter 3.

[0092] Based on this, if the second filter element 3 is placed above the first filter element 2, please refer to... Figure 2 Since the second filter element 3 is flexible, it may come into contact with the first filter element 2 after deformation, which will affect the filtration effect of the second filter element 3. Therefore, multiple strip-shaped or plate-shaped support elements 41 can be added to the first bracket 4 to effectively support the second filter element 3 and keep the second filter element 3 and the first filter element 2 or the first bracket 4 at a distance.

[0093] The support member 41 has a strip-shaped support surface, so that when it comes into contact with the second filter member 3, it has a small contact area and will not affect the ventilation efficiency and filtration effect of the second filter member 3.

[0094] The second filter element 3 has a second bracket 7 at its second end facing the air outlet 12. Please refer to... Figure 3 , Figure 4 and Figure 8 The second bracket 7 can seal and cover the second end of the first filter element 2, and the outer edge of the second bracket 7 extends toward the housing 1 and is sealed to the housing 1, thereby forming a closed structure at the second end of the airflow channel 6. This ensures that the air in the airflow channel 6 cannot move directly to the air outlet 12, but can only move to the air outlet 12 after passing through the first filter element 2 and entering the filter inner cavity 5, thus ensuring that the air can be fully filtered by the first filter element 2.

[0095] The sealing arrangement between the second bracket 7 and the second end of the first filter element 2 also prevents air from flowing out directly from the second end of the first filter element 2, so that air can only enter the filter cavity 5 through the airflow channel 6 along the ventilation section of the first filter element 2, thus ensuring the filtration effect of the first filter element 2.

[0096] In addition, please refer to Figure 4 and Figure 8 The second bracket 7 is provided with a vent that communicates with the air outlet side of the ventilation section of the first filter element 2. The first filter element 2 has a filter cavity 5, and the vent communicates with the filter cavity 5. The fan assembly 8 can communicate with the filter cavity 5 through the vent 71, so that under the action of the fan assembly 8, the air in the filter cavity 5 moves through the vent 71 to the air outlet 12 and is finally discharged outside the casing 1.

[0097] 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.

[0098] 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 casing (1) includes an air inlet (11) and an air outlet (12); A fan assembly (8) is disposed on the housing (1), and the fan assembly (8) is used to generate an air path from the air inlet (11) to the air outlet (12); The first filter element (2) is disposed in the housing (1) and located in the air duct; The second filter element (3) is detachably disposed on the housing (1) or the first filter element (2). The second filter element (3) is flexible and breathable. The second filter element (3) is located in the air path between the air inlet (11) and the first filter element (2). The filtration accuracy of the second filter element (3) is less than that of the first filter element (2).

2. The air purifier according to claim 1, characterized in that, The second filter element (3) has an air inlet that is connected to the air inlet (11).

3. The air purifier according to claim 1, characterized in that, The housing (1) includes: The housing (14) contains the first filter element (2) and the second filter element (3). The air inlet hood (13) is detachably connected to the housing (14). The air inlet hood (13) is provided with the air inlet (11). The air inlet of the second filter element (3) is directly connected to the air inlet (11) and sealed.

4. The air purifier according to claim 1, characterized in that, In the direction from the air inlet (11) to the air outlet (12), the second filter element (3), the first filter element (2), and the fan assembly (8) are arranged in sequence.

5. The air purifier according to claim 1, characterized in that, The second filter element (3) is spaced apart from the first filter element (2), and the diameter of the second filter element (3) gradually increases in the direction from the air inlet (11) to the air outlet (12).

6. The air purifier according to claim 3, characterized in that, The bottom of the housing (14) is provided with a partition (9), and the inner side of the partition (9) forms a receiving groove (91) in the air passage. The second filter element (3) is placed in the receiving groove (91). An air inlet channel (92) is formed between the outer side of the partition (9) and the housing (14). A plurality of air inlet holes (15) are opened on the housing (14) corresponding to the air inlet channel (92). The air inlet hood (13) has a cavity (131), one side of which is connected to the second filter element (3). The air inlet (11) includes a first air inlet (111) located on the side of the air inlet hood (13) away from the second filter element (3), and a second air inlet (112) located on both sides of the air inlet hood (13). The first air inlet (111) is used to connect the cavity (131) and the outside of the housing (14), and the second air inlet (112) connects the cavity (131) and the air inlet channel (92).

7. The air purifier according to claim 6, characterized in that, The number of air inlet hoods (13) is one or more, and the plurality of air inlet hoods (13) are distributed circumferentially along the bottom of the housing (14).

8. The air purifier according to claim 1, characterized in that, An airflow channel (6) is formed between the first filter element (2) and the inner wall of the housing (1), and the airflow in the air path enters the airflow channel (6) after passing through the second filter element (3).

9. The air purifier according to claim 8, characterized in that, The second filter element (3) is connected to the first end of the airflow channel (6), the second end of the airflow channel (6) is closed, and the air inlet side of the ventilation section of the first filter element (2) is connected between the first end and the second end of the airflow channel (6).

10. The air purifier according to claim 9, characterized in that, The first filter element (2) is provided with a first bracket (4) at the first end facing the air inlet (11). The first bracket (4) seals and covers the first end of the first filter element (2). There is a gap between the first bracket (4) and the housing (1) to connect the second filter element (3) and the first end of the airflow channel (6). The first bracket (4) is provided with a support member (41), which is distributed between the second filter element (3) and the first filter element (2).

11. The air purifier according to claim 9, characterized in that, The first filter element (2) is provided with a second bracket (7) at the second end facing the air outlet (12). The second bracket (7) seals and covers the second end of the first filter element (2). The outer edge of the second bracket (7) extends toward the housing (1) and is sealed and connected to the housing (1) to form the closed second end of the airflow channel (6). The second bracket (7) is provided with a vent (71) that communicates with the air outlet side of the ventilation section of the first filter (2), and the fan assembly (8) communicates with the ventilation section of the first filter (2) through the vent (71).

12. The air purifier according to claim 1, characterized in that, Along the vertical height direction of the air purifier, the first filter element (2) and the second filter element (3) are not at the same height.

13. A filter element used in an air purifier, characterized in that, include: The first filter element (2) is installed at the main filter position of the air purifier's air duct. The second filter element (3) is installed on the air inlet side of the first filter element (2) and has flexibility and air permeability; The filtration accuracy of the second filter element (3) is less than that of the first filter element (2).

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