Primary filter and air purifier

Abstract

The embodiment of the application discloses a primary filter and an air purifier. The primary filter is applied to the air purifier. The primary filter has an air inlet and a cavity in communication with the air inlet. The side of the primary filter opposite to the air inlet is a closed structure.

Description

[0001] This application claims priority to Chinese patent application No. 202520800556.2, dated 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 household appliance technology, and more particularly to a primary filter and an air purifier. Background Technology

[0003] Modern air purifiers typically employ a multi-stage filtration structure, which includes a pre-filter and a high-efficiency HEPA filter to effectively filter particles of different sizes. The use of a pre-filter can also extend the lifespan of the high-efficiency filter.

[0004] However, in pet-filled homes or dusty environments, pre-filters can easily accumulate a lot of hair and dust. When cleaning the pre-filter, these pollutants may fall off and into the indoor environment, causing secondary pollution. Utility Model Content

[0005] This application discloses a primary filter and an air purifier that can effectively collect pollutants after primary filtration, thereby reducing dust generated during the cleaning of the primary filter and reducing secondary pollution to the indoor environment.

[0006] The first aspect of this application discloses a primary filter element applied in an air purifier. The primary filter element has an air inlet and a cavity communicating with the air inlet, and the side of the primary filter element opposite to the air inlet is a closed structure.

[0007] In one possible implementation, the primary filter element is a breathable dust collection bag or dust collection net.

[0008] In one possible implementation, the primary filter is a single-use filter.

[0009] The second aspect of this application discloses an air purifier, comprising: a primary filter as provided in the first aspect of this application; a housing including an air inlet and an air outlet; a secondary filter disposed in the housing, the secondary filter having a filter cavity, at least a portion of the primary filter being disposed within the filter cavity; and a fan assembly for driving airflow from the air inlet of the primary filter into the cavity of the primary filter, and after passing through the secondary filter, flowing to the air outlet.

[0010] This application also discloses an air purifier, comprising: a primary filter as provided in the first aspect of this application; a housing including an air inlet and an air outlet; a fan assembly disposed on the housing, the fan assembly being used to generate an airflow flowing from the air inlet to the air outlet; and a secondary filter disposed on the housing, wherein the primary filter is flexible, at least a portion of the primary filter is disposed between the air inlet and the secondary filter, and the primary filter is detachably disposed on the housing.

[0011] In one possible implementation, the primary filter element is detachably disposed within the housing.

[0012] In one possible implementation, the secondary filter has a first bracket at its end facing the air inlet, and the primary filter has a second bracket on the outer periphery of the air inlet, the second bracket being detachably connected to the first bracket.

[0013] In one possible implementation, the first support extends circumferentially along the secondary filter and covers the end of the secondary filter.

[0014] In one possible implementation, a seal is provided between the first bracket and the second bracket.

[0015] In one possible implementation, the filtration accuracy of the primary filter element is lower than that of the secondary filter element.

[0016] In one possible implementation, the secondary filter has a first end facing the air inlet and a second end facing away from the air inlet, the outer diameter of the second end being smaller than the outer diameter of the first end.

[0017] In one possible implementation, the housing includes: a top cover, the air inlet being formed in the top cover; and a housing, the secondary filter being disposed within the housing, the top cover being detachably connected to the housing.

[0018] In one possible implementation, a partition is provided at the end of the secondary filter facing away from the air inlet, and the partition closes the filter cavity; an airflow channel is formed between the secondary filter and the inner wall of the housing, and the airflow from the secondary filter enters the airflow channel; the fan assembly is connected to the airflow channel and the air outlet.

[0019] In one possible implementation, the air inlet is located at the top of the housing, and the fan assembly includes a ventilation grille protruding toward the air inlet, the top of which supports the partition, such that vents formed around the ventilation grille communicate with the airflow channel.

[0020] In one possible implementation, along the height direction, the fan assembly is located at the bottom of the secondary filter; the air inlet is located at the top of the housing; the air outlet communicates with the fan assembly; and the air outlet is located on the side wall or bottom wall of the housing.

[0021] The beneficial effects of this application are:

[0022] The primary filter provided in this application embodiment allows airflow to enter through the air inlet, where larger pollutants and hair are collected in the cavity of the primary filter. This makes it less likely to generate dust when cleaning the primary filter, improving the ease of cleaning the primary filter and the user experience.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

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

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

[0026] Figure 2 This is a schematic diagram of the structure of an air purifier provided in an embodiment of this application;

[0027] Figure 3 This is a cross-sectional schematic diagram of an air purifier provided in an embodiment of this application;

[0028] Figure 4 An assembly diagram of a secondary filter and a primary filter in an air purifier provided for an embodiment of this application;

[0029] Figure 5 An exploded structural diagram of a secondary filter and a primary filter in an air purifier provided in an embodiment of this application;

[0030] Figure 6 This is a schematic diagram of the structure of a secondary filter element in an air purifier provided in an embodiment of this application;

[0031] Figure 7 This is a schematic diagram of the exploded structure of an air purifier provided in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100-Air purifier; 10-Casing; 101-Air inlet; 102-Air outlet; 103-Top cover; 104-Shell; 20-Fan assembly; 201-Ventilation grille; 202-Ventilation opening; 30-Secondary filter; 301-Filter cavity; 302-First bracket; 303-Partition; 40-Primary filter; 401-Air inlet; 402-Second bracket; 403-Cavity; 50-Airflow channel. Detailed Implementation

[0034] 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.

[0035] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0037] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0038] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0039] Air purifiers typically have multiple air inlets on the side wall of their casing. The negative pressure generated by the internal fan draws indoor air through these inlets, where it is filtered directly by the filter before flowing into the room. However, after prolonged use, dust, particles, and hair quickly accumulate on the filter surface, reducing ventilation area, increasing air resistance, and decreasing purification efficiency. As usage time increases, the filter's adsorption capacity decreases, requiring users to use a vacuum cleaner or brush to clean it, thus shortening the filter's lifespan and negatively impacting the user experience.

[0040] Some air purifiers offer a multi-stage filtration system, where a pre-filter is placed outside the main filter element. Air entering through the air inlet on the side wall of the unit first passes through the pre-filter, then the main filter element, and finally is pressurized and accelerated by the fan assembly before being discharged into the room. However, the pre-filter will take up installation space in the main filter element, thus reducing the filter element's dust holding capacity and filtration efficiency.

[0041] In addition, when cleaning the pre-filter, the housing needs to be disassembled first. Since the pre-filter is located between the filter element and the housing, after the housing is removed, the pre-filter is completely exposed to the indoor environment, which can easily cause dust problems.

[0042] Based on this, this application provides a primary filter and an air purifier. The primary filter can collect larger pollutants and hair in the cavity, reducing dust generated when cleaning the primary filter. The air purifier using the primary filter can improve the cleanliness and service life of the secondary filter (filter element).

[0043] Please see Figure 1 This application provides a primary filter element 40, which has relatively low requirements for filtration accuracy and can be made of materials such as filter cotton layer, activated carbon layer, non-woven fabric or special paper, thereby reducing costs while ensuring the primary filtration effect.

[0044] One end of the primary filter element 40 has an air inlet 401 for allowing airflow. The primary filter element 40 may have a cavity 403, and the air inlet 401 communicates with the cavity 403. The airflow entering the primary filter element through the air inlet 401 may carry larger pollutants such as dust, hair, and lint. After being filtered by the primary filter element 40, the larger pollutants such as dust, hair, and lint are adsorbed or collected in the cavity 403.

[0045] The primary filter 40 has a closed structure at the end opposite to the air inlet 401. For example, the primary filter 40 can be constructed as a hollow cylinder with a bottom at one end and an open end (air inlet 401) at the other. This is equivalent to the primary filter 40 having a closed cavity 403 at one end. Larger particles of dust, hair, and lint, etc., adsorbed and collected by the primary filter 40 can be collected in the cavity 403 of the primary filter 40. This prevents secondary pollution and dust generation during the removal of the primary filter 40 from the air purifier 1.

[0046] Since larger particles of dust, hair, and lint are collected by the primary filter element 40, when these pollutants need to be cleaned, they are concentrated inside the primary filter element 40. Therefore, when the primary filter element 40 is disassembled, the pollutants are less likely to escape to the outside of the primary filter element 40, thus reducing the probability of dust.

[0047] In related technologies, the pre-filter traps contaminants that adhere to one side of its surface. Disassembling the pre-filter causes vibrations that lead to contaminants falling off and escaping. However, in the primary filter 40 provided in this embodiment, because airflow enters the cavity 403 from the air inlet 401, a small portion of the contaminants carried by the airflow may adhere to the inner surface of the cavity 403, significantly reducing the amount of contaminants adhering to the outer surface of the primary filter 40. Therefore, dust is less likely to be generated during the disassembly of the primary filter 40. Furthermore, even if the primary filter 40 vibrates, the contaminants adhering to the inner surface of the cavity 403 will fall into the cavity 403 and are less likely to escape to the outside of the primary filter 40.

[0048] In some embodiments, the primary filter element 40 is a breathable dust collection bag or dust collection net.

[0049] The primary filter 40 can be a breathable dust collection bag, which can be made of non-woven fabric, special paper or other fabrics. Dust collection bags made of non-woven fabric or other fabrics are less expensive and can be discarded after one use. Users do not need to clean the primary filter 40, which improves the convenience of maintaining the air purifier 100.

[0050] The primary filter element 40 can also be a dust collection screen, which can be made of metal. For example, the dust collection screen can be woven from stainless steel or galvanized steel wire. This makes the dust collection screen durable and reusable, effectively removing accumulated pollutants through simple water rinsing or air backflushing, allowing for multiple cycles of use.

[0051] Please see Figure 2 and Figure 3As shown, this application embodiment provides an air purifier 100, including the primary filter 40 in any of the above embodiments. The air purifier 100 also includes a housing 10. The housing 10 is provided with an air inlet 101 and an air outlet 102. The housing 10 serves as the exterior component of the air purifier 100, providing structural support and protection for the working parts of the air purifier 100 (fan assembly 20, secondary filter 30, etc.).

[0052] The air purifier 100 may include a secondary filter 30. The secondary filter 30 is disposed on the housing 10 and fixed relative to the housing 10, so that the secondary filter 30 has structural stability when airflow passes through it.

[0053] like Figure 3 As shown, the secondary filter element 30 may have a filter cavity 301, meaning the secondary filter element 30 is constructed as a cavity structure. The secondary filter element 30 can be a filter cartridge. The filter cartridge can be a hollow cylindrical structure formed by materials such as HEPA (High-Efficiency Particulate Air Filter) filter media, activated carbon composite layers, or electrostatic adsorption filter media. The secondary filter element 30 may have a multi-layer pleated structure. This multi-layer pleated structure can increase the effective filtration area, improve dust holding capacity, and simultaneously reduce the air resistance of the secondary filter element 30, thereby improving airflow efficiency.

[0054] like Figure 3 As shown, the air purifier 100 may include a primary filter 40. The primary filter 40 may be disposed in the housing 10 or the secondary filter 30, and fixed relative to the housing 10. At least a portion of the primary filter 40 is disposed within the filter cavity 301 of the secondary filter 30. That is, the primary filter 40 may be entirely located within the filter cavity 301, or it may be partially located within the filter cavity 301. By placing at least a portion of the primary filter 40 within the filter cavity 301, the space within the filter cavity 301 can be utilized, thereby improving the structural compactness of the air purifier 100.

[0055] like Figure 4As shown, one end of the primary filter 40 has an air inlet 401. The air inlet 401 of the primary filter 40 faces the air inlet 101 of the housing 10. The air inlet 401 is connected to the air inlet 101. The airflow disturbed by the fan assembly 20 can directly enter the air inlet 401 of the primary filter 40 from the air inlet 101, undergo primary filtration by the primary filter 40, and then enter the secondary filter 30, flowing through the secondary filter 30 before flowing back into the fan assembly 20. In this way, larger pollutants such as dust, hair, and lint are adsorbed or collected by the primary filter 40, while smaller dust particles (e.g., PM2.5, bacteria) that the primary filter 40 fails to filter are further filtered by the secondary filter 30 outside the primary filter 40, thereby reducing the filtration load on the secondary filter 30. The probability of the secondary filter 30 coming into contact with larger dust, particulate matter, hair, and lint is reduced, so it does not need to be replaced frequently, extending the service life of the secondary filter 30.

[0056] It is understood that the primary filter element 40 is a primary filtration component, and its filtration precision can be lower than that of the secondary filter element 30. For example, the primary filter element 40 can be made of materials such as filter cotton layer, activated carbon layer, non-woven fabric, or special paper. This achieves staged filtration in the air purifier 100, reducing costs while ensuring filtration effectiveness.

[0057] The primary filter element 40 may have a cavity. Since the air inlet 401 of the primary filter element 40 is connected to the air inlet 101 of the housing 10, the airflow entering from the air inlet 401 will fill the primary filter element 40. The air pressure generated by the airflow can cause the primary filter element 40, made of flexible material, to be stretched and automatically expanded, thereby accommodating more pollutants.

[0058] like Figure 3 As shown, the air purifier 100 also includes a fan assembly 20. The fan assembly 20 is used to drive airflow from the air inlet 401 of the primary filter 40 into the cavity 403 of the primary filter 40, and then through the secondary filter 30 to the air outlet 102.

[0059] The fan assembly 20 can be mounted on the housing 10 and fixed relative to the housing 10. The fan assembly 20 includes a volute and a fan wheel disposed within the volute. When the fan wheel rotates, it can generate negative pressure suction, thereby generating airflow from the air inlet 101 to the air outlet 102. Air from the indoor environment is drawn into the air inlet 101, and the airflow entering the air inlet 101 passes through the primary filter 40 and the secondary filter 30 before being discharged from the air outlet 102.

[0060] Unlike the multi-stage filtration schemes of related technologies, the air purifier 100 provided in this application embodiment places at least a portion of the primary filter element 40 within the filter cavity 301 of the secondary filter element 30, and connects the air inlet 401 of the primary filter element 40 to the air inlet 101, forming an airflow filtration path from the inside to the outside of the secondary filter element 30. In this way, the primary filter element 40 used for primary filtration does not encroach on the installation space of the secondary filter element 30. The secondary filter element 30 can be sized and structurally designed according to actual needs, enabling it to maintain an effective filtration area and dust holding capacity, achieving an ideal filtration effect.

[0061] In addition, larger particles of dust, hair, and lint can be collected by the primary filter element 40. When these pollutants need to be cleaned, since the pollutants are concentrated inside the primary filter element 40, it is only necessary to separate the primary filter element 40 from the secondary filter element 30. The pollutants are not likely to escape to the outside of the primary filter element 40, thus reducing the probability of dust.

[0062] Thus, the air purifier 100 provided in this application embodiment places the primary filter 40 within the filter cavity of the secondary filter 30, without encroaching on the installation space of the secondary filter 30. This allows the secondary filter 30 to maintain its effective filtration area and dust holding capacity, while also improving the space utilization of the air purifier 100. Furthermore, the airflow path from the inside out, where airflow enters the primary filter 40 and then the secondary filter 30, ensures that larger pollutants are intercepted and collected by the primary filter 40, reducing the pollution load on the secondary filter 30 and effectively extending its service life. Additionally, cleaning the primary filter 40 does not easily generate dust, improving the user experience.

[0063] This application also provides an air purifier, which includes the primary filter element from any of the above embodiments. The air purifier also includes a housing. The housing has an air inlet and an air outlet. As the exterior component of the air purifier, the housing provides structural support and protection for the working parts (fan assembly, secondary filter element, etc.) of the air purifier.

[0064] Air purifiers also include a fan assembly. The fan assembly is mounted on the casing and fixed to it. Inside the fan assembly is a fan wheel; when the fan wheel rotates, it generates negative pressure suction, creating an airflow that flows directly from the air inlet to the air outlet. Air from the indoor environment is drawn into the air inlet, filtered, and then discharged from the air outlet.

[0065] Air purifiers may include a secondary filter. The secondary filter is mounted on the housing and fixed relative to the housing to ensure structural stability as airflow passes through it.

[0066] The secondary filter element can be a filter cartridge. Filter cartridges can be hollow cylindrical structures formed from materials such as HEPA (High-Efficiency Particulate Air) filter media, activated carbon composite layers, or electrostatic adsorption filter media. Secondary filter elements can have a multi-layered pleated structure, which increases the effective filtration area, improves dust holding capacity, reduces air resistance, and enhances airflow efficiency.

[0067] Air purifiers may include a primary filter. At least part of the primary filter may be placed between the air inlet and the secondary filter. In this way, larger dust, particulate matter, hair, and lint are adsorbed or collected by the primary filter, while smaller particles (such as PM, bacteria, and other fine particles) that the primary filter cannot filter out are further filtered by the secondary filter, thereby reducing the filtration load on the secondary filter.

[0068] It should be noted that at least part of the primary filter element is disposed between the air inlet and the secondary filter element. This can be understood as the airflow entering from the air inlet first passing through at least part of the primary filter element before entering the secondary filter element. The spatial relationship between the air inlet, the secondary filter element, and the primary filter element is not strictly limited. For example, the primary filter element can be located outside or inside the secondary filter element, or at least part of the primary filter element can be located above the secondary filter element. The spatial relationship between the air inlet, the secondary filter element, and the primary filter element can be reasonably arranged according to actual needs.

[0069] The primary filter is removable from the housing. Because larger dust particles, hair, and lint are adsorbed or collected by the primary filter, when the primary filter reaches a certain level of pollution, users can easily separate and disassemble the primary filter from the housing for cleaning or replacement, simplifying the maintenance steps of the air purifier.

[0070] The primary filter element 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. This flexibility allows the primary filter element to be bent or deformed, making it more adaptable to the internal structure of the air purifier. Furthermore, after being separated from the casing, the flexible primary filter element is easier to wash and clean, making it more convenient for users to clean.

[0071] Thus, in the air purifier provided in this application embodiment, the airflow first passes through the primary filter between the air inlet and the secondary filter, allowing larger pollutants to be intercepted and collected by the primary filter, reducing the pollution load on the secondary filter and effectively extending its service life. Simultaneously, when the primary filter needs cleaning, it can be easily removed from the casing for individual cleaning, improving the ease of use of the air purifier.

[0072] In some embodiments, the primary filter element 40 is detachably disposed on the housing 10.

[0073] The primary filter 40 is detachably connected to the housing 10. When the primary filter 40 has adsorbed or collected a large amount of pollutants, it can be removed from the air purifier 100 and cleaned separately to prevent the primary filter 40 from increasing air resistance.

[0074] The primary filter element 40 can be detachably connected to the housing 10 through magnetic connection, snap-on connection, plug-in connection, Velcro connection, etc. This application embodiment does not specifically limit the specific detachable form of the primary filter element 40 and the housing 10.

[0075] In some embodiments, the end of the secondary filter 30 facing the air inlet 101 has a first support 302.

[0076] As mentioned above, the secondary filter element 30 is made of materials such as HEPA filter media, activated carbon composite layer, or electrostatic adsorption filter media, and therefore has a certain degree of flexibility. By placing the first support 302 at the end of the secondary filter element 30, the secondary filter element 30 can maintain its structural shape and prevent deformation under the impact of airflow.

[0077] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, a second bracket 402 may be provided on the outer periphery of the air inlet 401 of the primary filter element 40.

[0078] Since the primary filter element 40 may be a flexible filter element, the second bracket 402 can provide structural support and an assembly base for the primary filter element 40. The primary filter element 40 can be made of rigid material. The second bracket 402 is connected to the outer periphery of the air inlet 401 of the primary filter element 40, so that the air inlet 401 can maintain a fixed shape and will not deform or shift under the impact of airflow, thereby increasing the air intake volume of the air inlet 401.

[0079] In some embodiments, such as Figure 5 As shown, the second bracket 402 is detachably connected to the first bracket 302.

[0080] The second bracket 402 can be detachably connected to the secondary filter element 30 through magnetic connection, snap connection, plug connection, Velcro connection, etc. In this embodiment, the specific detachable form of the primary filter element 40 and the secondary filter element 30 is not specifically limited.

[0081] The first bracket 302 and the second bracket 402 not only provide structural support for the secondary filter element 30 and the primary filter element 40 respectively, maintaining their morphological stability, but can also be reused as detachable and connectable components, realizing the dual function of the first bracket 302 and the second bracket 402, and simplifying the number of structural components of the air purifier 100.

[0082] In some embodiments, such as Figure 6 As shown, the first support 302 extends circumferentially along the secondary filter element 30 and covers the end of the secondary filter element 30.

[0083] The first bracket 302 is installed over the end of the secondary filter element 30, which can close or seal the end of the secondary filter element 30. In this way, the airflow entering through the air inlet 101 will not directly enter the secondary filter element 30 from the end of the secondary filter element 30, but will pass through the primary filter element 40 and then enter the ventilation section of the secondary filter element 30 from the filter cavity 301 of the secondary filter element 30. This prevents the airflow from directly entering the secondary filter element 30 from the end of the secondary filter element 30 without passing through the primary filter element 40 and accumulating at the end of the secondary filter element 30, thereby improving the effect of multi-stage filtration.

[0084] In some embodiments, a seal is provided between the first bracket 302 and the second bracket 402. When assembling the first bracket 302 and the second bracket 402, the seal can be placed between the first bracket 302 and the second bracket 402 to allow as much airflow as possible from the air inlet 101 to enter the primary filter 40, rather than flowing out from the gap between the first bracket 302 and the second bracket 402 and directly into the fan assembly 20, thereby improving the filtration effect of the air purifier 100.

[0085] In some embodiments, the filtration accuracy of the primary filter 40 is lower than that of the secondary filter 30. As a primary filtration component, the primary filter 40 can have a lower filtration accuracy than the secondary filter 30, thereby mainly adsorbing or collecting larger pollutants such as dust, particulate matter, hair, and lint. This not only achieves graded interception of pollutants but also makes the overall cost of the air purifier 100 more controllable.

[0086] In some embodiments, such as Figure 1 and Figure 3 As shown, along the height direction of the air purifier 100, the end of the primary filter 40 opposite to the air inlet 401 is a closed structure.

[0087] The primary filter 40 has a closed structure at the end opposite to the air inlet 401. For example, the primary filter 40 can be constructed as a hollow cylindrical structure with a bottom at one end and an open end (air inlet 401) at the other. This is equivalent to the primary filter 40 having a closed inner cavity at one end, where pollutants adsorbed and collected by the primary filter 40 can be collected. This prevents secondary pollution and dust generation during the removal of the primary filter 40 from the housing 10 or the secondary filter 30.

[0088] In some embodiments, the primary filter element 40 is a breathable dust collection bag or dust collection net.

[0089] The primary filter 40 can be a breathable dust collection bag, which can be made of non-woven fabric, special paper or other fabrics. Dust collection bags made of non-woven fabric or other fabrics are less expensive and can be discarded after one use. Users do not need to clean the primary filter 40, which improves the convenience of maintaining the air purifier 100.

[0090] The primary filter element 40 can also be a dust collection screen, which can be made of metal. For example, the dust collection screen can be woven from stainless steel or galvanized steel wire. This makes the dust collection screen durable and reusable; accumulated pollutants can be effectively removed by simple rinsing with water or backflushing with air, allowing for multiple cycles of use.

[0091] In some embodiments, such as Figure 2 , Figure 3 and Figure 7 As shown, the air inlet 101 is located at the top of the housing 10, and the air outlet 102 is located on the side wall or bottom wall of the housing 10. The air outlet 102 is connected to the fan assembly 20.

[0092] The air inlet 101 is located at the top of the casing 10, realizing the top air intake mode of the air purifier 100. In this way, larger particles, hair and lint entering from the top can fall naturally into the primary filter 40 by gravity. At the same time, with the impact of the airflow, these pollutants will be stably collected in the primary filter 40, and the pollutants in the primary filter 40 are not likely to escape again.

[0093] In addition, since smaller particles (such as PM2.5, dust, etc.) tend to rise naturally, the top air intake design of the air purifier 100 can more efficiently capture and inhale the tiny particles floating in the upper and middle layers of the indoor environment, thus improving the air purification effect.

[0094] In some embodiments, such as Figure 3 As shown, along the height direction, the fan assembly 20 is located at the bottom of the secondary filter element 30.

[0095] The secondary filter 30 and the primary filter 40 are located at the top of the fan assembly 20, which allows the airflow entering from the air inlet 101 to be purified and filtered before being pressurized and accelerated for discharge by the fan assembly 20. In addition, by placing the fan assembly 20 at the bottom of the air purifier 100, the center of gravity of the air purifier 100 can be lowered, making the air purifier 100 more stable in the indoor environment.

[0096] In some embodiments, such as Figure 7 As shown, the housing 10 includes a top cover 103 and a housing 104. An air inlet 101 is located on the top cover 103, and the top cover 103 and housing 104 are detachably connected. Thus, when the primary filter 40 needs to be replaced or cleaned, the top cover 103 can be removed from the housing 104, making the primary filter 40 visible to the user. The user can directly remove the primary filter 40 from the housing 10 or the secondary filter 30 and pull it upwards, thereby facilitating the replacement or cleaning of the primary filter 40.

[0097] In some embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, a baffle 303 is provided on the side of the secondary filter 30 facing away from the air inlet 101. The baffle 303 closes the filter cavity 301. An airflow channel 50 is formed between the secondary filter 30 and the inner wall of the housing 10. The airflow from the secondary filter 30 enters the airflow channel 50, and the fan assembly 20 is connected to the airflow channel 50 and the air outlet 102.

[0098] The partition 303 seals the filter cavity 301 of the secondary filter 30. In this way, the airflow after being filtered by the primary filter 40 can only flow out of the secondary filter 30 through the filter section of the secondary filter 30, instead of flowing directly to the fan assembly 20. This achieves directional guidance of the airflow, so that the airflow entering the fan assembly 20 is fully filtered by the primary filter 40 and the secondary filter 30. This reduces the probability that the airflow will directly enter the fan assembly 20 without being filtered by the secondary filter 30, thereby improving the overall filtration efficiency of the air purifier 100.

[0099] Because the bottom of the filter cavity 301 of the secondary filter element 30 is closed, the airflow from the secondary filter element 30 will enter the airflow channel 50 between the housing 10 and the secondary filter element 30, and then enter the fan assembly 20 through this airflow channel 50. For example, Figure 2 The dashed lines in the diagram show the airflow filtration path of the air purifier 100 according to an embodiment of this application.

[0100] In some embodiments, the secondary filter 30 has a first end facing the air inlet 101 and a second end facing away from the air inlet 101, the outer diameter of the second end being smaller than the outer diameter of the first end. In this way, the secondary filter 30 can be approximately constructed as an inverted cone structure, the space of the airflow channel 50 is increased, the airflow rate that the airflow channel 50 can accommodate is increased, and the wind resistance and noise within the airflow channel 50 are reduced.

[0101] In some embodiments, such as Figure 3 As shown, the fan assembly 20 includes a ventilation grille 201 protruding toward the air inlet 101, which is connected to the air inlet opening of the fan housing 10. A top support partition 303 of the ventilation grille 201 connects the ventilation opening 202 of the ventilation grille 201 to the airflow channel 50.

[0102] The ventilation grille 201 can protrude toward the air inlet 101. The top of the ventilation grille 201 can support the partition 303, and the top of the ventilation grille 201 can be connected to or abut against the partition 303.

[0103] The ventilation grille 201 has ventilation openings 202 located on its periphery, and the ventilation openings 202 can be distributed throughout the entire outer periphery of the ventilation grille 201. The ventilation openings 202 can face the housing 10 to communicate with the airflow channel 50 on the periphery of the air purifier 100.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A primary filter element, characterized in that, The primary filter element is used in air purifiers. The primary filter element has an air inlet and a cavity communicating with the air inlet, and the end of the primary filter element opposite to the air inlet is a closed structure.

2. The primary filter element according to claim 1, characterized in that, The primary filter element is a breathable dust collection bag or dust collection mesh; and / or The primary filter element is a disposable filter element.

3. An air purifier, characterized in that, include: The primary filter element as described in claim 1 or 2; A housing, the housing including an air inlet and an air outlet; A secondary filter element is disposed in the housing, the secondary filter element having a filter cavity, and at least a portion of the primary filter element is disposed within the filter cavity; A fan assembly is used to drive airflow from the air inlet of the primary filter into the cavity of the primary filter, and then through the secondary filter to the air outlet.

4. The air purifier according to claim 3, characterized in that, The primary filter element is detachably mounted on the housing.

5. The air purifier according to claim 3, characterized in that, The secondary filter element has a first bracket at its end facing the air inlet, and the primary filter element has a second bracket on the outer periphery of the air inlet, the second bracket being detachably connected to the first bracket.

6. The air purifier according to claim 5, characterized in that, The first support extends circumferentially along the secondary filter element and covers the end of the secondary filter element; and / or A sealing element is provided between the first bracket and the second bracket.

7. The air purifier according to claim 3, characterized in that, The filtration accuracy of the primary filter element is lower than that of the secondary filter element; and / or The secondary filter element has a first end facing the air inlet and a second end facing away from the air inlet, wherein the outer diameter of the second end is smaller than the outer diameter of the first end.

8. An air purifier, characterized in that, include: The primary filter element as described in claim 1 or 2; A housing, the housing including an air inlet and an air outlet; A fan assembly is disposed in the housing, the fan assembly being used to generate an airflow from the air inlet to the air outlet; A secondary filter element is disposed in the housing. The primary filter element is flexible. At least a portion of the primary filter element is disposed between the air inlet and the secondary filter element. The primary filter element is detachably disposed in the housing.

9. The air purifier according to claim 8, characterized in that, The filtration accuracy of the primary filter element is lower than that of the secondary filter element; and / or The secondary filter element has a first end facing the air inlet and a second end facing away from the air inlet, wherein the outer diameter of the second end is smaller than the outer diameter of the first end.

10. The air purifier according to any one of claims 3 to 9, characterized in that, The housing includes: Top cover, wherein the air inlet is formed on the top cover; The housing contains the secondary filter element, and the top cover is detachably connected to the housing.

11. The air purifier according to any one of claims 3 to 9, characterized in that, The secondary filter element is provided with a baffle at the end opposite to the air inlet, and the baffle closes the filter cavity; An airflow channel is formed between the secondary filter and the inner wall of the housing. The airflow from the secondary filter enters the airflow channel, and the fan assembly is connected to the airflow channel and the air outlet.

12. The air purifier according to claim 11, characterized in that, The air inlet is located at the top of the housing, and the fan assembly includes a ventilation grille protruding toward the air inlet. The top of the ventilation grille supports the partition, so that the ventilation openings formed around the ventilation grille are connected to the airflow channel.

13. The air purifier according to any one of claims 3 to 9, characterized in that, Along the height direction of the air purifier, the fan assembly is located at the bottom of the secondary filter element; The air inlet is located at the top of the housing, the air outlet is connected to the fan assembly, and the air outlet is located on the side wall or bottom wall of the housing.

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