Filter device for fan

Abstract

The utility model provides a filter device for a fan, which comprises a filter base, a filter element and a filter element, the mask is detachably connected to the filtering base, and a filtering cavity used for containing a filtering material is formed between the mask and the filtering base; the fixed air guide structure is formed on the mask, and the fixed air guide structure and the mask are integrally formed; the fixed air guide structure is provided with a plurality of ventilation openings with fixed shapes; wherein the mask and the filtering base are provided with mutually matched butt joint surfaces, and when the mask and the filtering base are assembled in place, the front projections of the mask and the filtering base cover the ventilation opening to form a sealing interface. The utility model solves the problems that the mask and the base of the existing fan filter are not tightly sealed, so that the stability of the filtering efficiency is influenced; and the disassembly and assembly process is complicated, so that the maintenance operation is tedious.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and more specifically, to a filtration device for fans. Background Technology

[0002] As a key purification component in fan systems, the performance of fan filters directly affects system operational stability, equipment lifespan, and output air quality. Currently, common fan filters have significant shortcomings in practical applications: Firstly, high filtration precision designs often result in a substantial increase in air resistance, leading to higher system energy consumption; conversely, simplifying the structure to reduce air resistance can decrease filtration efficiency, causing unfiltered particles to accelerate equipment wear. Secondly, traditional connection methods often require specialized tools, making disassembly and assembly cumbersome, and dust diffusion can easily occur due to structural disturbances during filter media replacement, leading to secondary pollution. Furthermore, existing filter structures are prone to deformation under high wind speeds or vibration conditions, resulting in seal failure, increased air leakage, and impacting the long-term operational reliability of the device.

[0003] The problems are: the existing fan filter's faceplate and base are not properly sealed, affecting the stability of the filtration efficiency; and the disassembly and assembly process is complicated, leading to cumbersome maintenance operations. Utility Model Content

[0004] This invention solves the technical problems of existing fan filters, such as poor sealing between the mask and the base, which affects the stability of filtration efficiency, and complex disassembly and assembly processes, leading to cumbersome maintenance. This invention improves filtration stability while achieving ease of installation and high efficiency of maintenance by providing mating surfaces for the mask and filter base, and allowing for detachable connection between them.

[0005] To address the aforementioned problems, this utility model provides a filtration device for a fan, comprising: a filter base for detachable installation on a fan flange; a face shield detachably connected to the filter base, forming a filter cavity for accommodating filter media; and a fixed air guide structure formed on the face shield, integrally molded with the face shield; the fixed air guide structure having multiple fixed-shape ventilation openings; wherein the face shield and the filter base have mating surfaces that cooperate with each other, and when the two are assembled in place, the front projections of the face shield and the filter base cover the ventilation openings to form a sealed interface.

[0006] Compared with existing technologies, the technical advantages of this solution are as follows: By integrally molding a fixed air guide structure with a fixed-shape vent onto the face mask and forming a sealed interface with the filter base, the reliability of the seal between the filter chamber and the external airflow path is ensured. Its integral structure eliminates the risk of leakage caused by assembly gaps and component tolerances, allowing airflow to pass through the filter material uniformly and stably only through the predetermined-shaped vent, thus guaranteeing long-term consistency in filtration efficiency. Simultaneously, integrating the fixed air guide structure and the face mask into a single component simplifies the overall construction and avoids the cumbersome steps and potential errors associated with traditional multi-component assembly. Furthermore, by combining sealing and air guiding functions, filtration stability is improved while achieving ease of installation and high efficiency in maintenance.

[0007] In one possible design, the filter base is provided with a snap-fit ​​structure, which allows the filter base to be detachably installed on the fan flange; wherein the snap-fit ​​structure includes multiple layers of snaps.

[0008] Compared with existing technologies, the technical advantages of this solution are as follows: By incorporating a multi-layered snap-fit ​​structure, the filter base can be directly and securely installed onto the fan flange. The snap-fit ​​structure eliminates the need for additional tools during the installation and disassembly of the entire filter unit, achieving truly rapid assembly and disassembly and significantly improving the convenience and efficiency of maintenance operations. The multi-layered snap-fit ​​mechanism provides a phased, progressive locking function, ensuring precise guidance during installation and reliable locking of the final position. This effectively prevents accidental loosening due to vibration or airflow impact, enhancing the structural stability and safety of the connection.

[0009] In one possible design, the side profile of the mask is a smoothly transitioning continuous curved surface.

[0010] Compared with existing technologies, the technical effects achieved by adopting this solution are as follows: By setting the side profile of the mask to a smooth, continuous curved surface, airflow can pass smoothly through the mask, effectively reducing eddies and turbulence, and significantly lowering overall wind resistance and aerodynamic noise. At the same time, the smooth curved surface eliminates dead corners and dead zones prone to water and dust accumulation at traditional right angles or edges, simplifying the cleaning and maintenance process; furthermore, the continuous curved surface avoids stress concentration points, enhancing the structural integrity and deformation resistance of the mask under vibration or pressure conditions.

[0011] In one possible design, drainage outlets are symmetrically arranged at the ends of the mask, extending to the edge of the mask.

[0012] Compared with existing technologies, the technical effects achieved by adopting this technical solution are as follows: By symmetrically setting drainage outlets at the end of the mask and extending to the edge, a highly efficient and rapid liquid drainage function is achieved; this allows condensate or other liquids to be quickly guided to the edge of the mask and completely drained, effectively avoiding water residue inside or on the surface of the mask; this smooth drainage mechanism prevents corrosion or mold growth caused by long-term water accumulation, significantly improving the durability and hygiene safety of the equipment.

[0013] In one possible design, the mask has widened baffles on both sides and reinforcing ribs on the inside.

[0014] Compared with existing technologies, the technical effects achieved by this solution are as follows: By installing widened baffles on both sides of the mask and adding reinforcing ribs on the inner side, the overall rigidity and protective capability of the structure are significantly enhanced. The widened baffles provide a larger lateral coverage area, effectively blocking the intrusion of external impurities and improving the sealing continuity of the mask edges. Simultaneously, the widened baffles enhance physical protection against accidental impacts or compression. The inner reinforcing ribs enable the mask to better resist deformation caused by system vibration, wind pressure, or installation stress, thereby maintaining the shape stability of the filter chamber and the integrity of the sealing surface. This allows the mask to maintain structural stability even under high wind speeds or long-term operating conditions, avoiding the risk of seal failure or filter media damage due to deformation, thus extending the service life of the entire filtration device.

[0015] In one possible design, the mask and filter base are detachably connected by at least one set of quick-release mechanisms; the quick-release mechanisms include a positioning pin on one side and a positioning slot on the other side.

[0016] Compared to existing technologies, this technical solution achieves the following advantages: By incorporating at least one quick-release structure consisting of positioning pins and positioning slots on both the face mask and filter base, a fast, precise, and reliable detachable connection is achieved. This allows the positioning pins to naturally enter the positioning slots during assembly, automatically completing precise radial and circumferential positioning of both components, effectively preventing misalignment and deviation, and ensuring accurate mating of the sealing surfaces. Furthermore, this plug-in connection method eliminates the need for tools to complete the main docking and initial fixing, significantly improving the operational efficiency of filter media installation and removal, and simplifying the maintenance process.

[0017] In one possible design, the quick-release structure is offset at both ends of the mask and / or filter base.

[0018] Compared with existing technologies, the technical benefits of this solution are as follows: By staggering the quick-installation structure at both ends of the mask and / or filter base, significant error-proofing and guidance optimization are achieved. This asymmetrical layout ensures that the mask and filter base can only be assembled in the single correct relative orientation, fundamentally eliminating problems such as misalignment of the sealing surface, weak connection, or functional failure caused by incorrect installation, greatly improving the accuracy and reliability of installation.

[0019] In one possible design, the locating pin and / or locating slot is a double-sided edge structure.

[0020] Compared with existing technologies, the technical effects achieved by this solution are as follows: By setting the locating pins and / or locating slots to a double-sided edge structure, the guiding accuracy, mating stability, and overall reliability of the quick-connect connection are significantly improved. The double-sided edge structure constrains the locating components on both sides during the docking process, providing a more balanced and smoother guiding effect, effectively preventing misalignment or jamming during insertion, and making assembly easier and less strenuous. This symmetrically reinforced structure enhances local resistance to deformation and wear, allowing the quick-connect structure to maintain shape stability and functional integrity even under repeated disassembly and assembly or long-term vibration conditions, thereby extending its service life and ensuring performance durability.

[0021] In one possible design, the filter base has a rubber strip mounting groove on the side away from the mask, and a sealing rubber strip is installed in the rubber strip mounting groove.

[0022] Compared with existing technologies, the technical effects achieved by this solution are as follows: By setting a rubber strip mounting groove on the side of the filter base away from the faceplate and installing a sealing rubber strip, reliable sealing and long-term stability of the interface between the filter device and the fan flange are achieved. Simultaneously, the rubber strip mounting groove precisely limits and fixes the sealing rubber strip within the dedicated mounting groove, ensuring that the rubber strip undergoes uniform and consistent elastic deformation under assembly pressure. This forms a continuous and tight sealing interface on the contact surface with the fan flange, effectively enhancing sealing performance and ensuring filtration efficiency.

[0023] In one possible design, the fixed air guide structure has an anti-backflow protrusion at the bottom of the vent to prevent water from flowing back into the vent.

[0024] Compared with existing technologies, the technical effects achieved by this solution are as follows: By installing an anti-backflow protrusion at the bottom of the vent in the fixed air guide structure, the problem of external water accumulation or condensation flowing back into the vent is effectively solved. The anti-backflow protrusion forms a physical barrier along the lower edge of the vent, reliably intercepting and guiding liquid flowing down the mask surface outwards, thus preventing water from flowing back into the filter chamber. This ensures that the airflow channel of the vent remains unobstructed and dry. At the same time, the anti-backflow protrusion effectively isolates moisture from contact with the internal filter material, preventing the filter material from caking, becoming moldy, or experiencing performance degradation due to moisture, significantly improving the service life and operational reliability of the filter material. Attached Figure Description

[0025] Figure 1 Schematic diagram of the structure of the filtration device for a fan provided in the embodiment of this utility model Figure 1 ;

[0026] Figure 2 A front view of a filtration device for a fan provided in an embodiment of this utility model;

[0027] Figure 3 Schematic diagram of the structure of the filtration device for a fan provided in the embodiment of this utility model Figure 2 ;

[0028] Figure 4 Schematic diagram of the structure of the face mask provided in the embodiment of this utility model Figure 1 ;

[0029] Figure 5 Schematic diagram of the structure of the face mask provided in the embodiment of this utility model Figure 2 ;

[0030] Figure 6 for Figure 5 Enlarged view of region A in the middle;

[0031] Figure 7 Schematic diagram of the structure of the filter base provided in the embodiment of this utility model Figure 1 ;

[0032] Figure 8 for Figure 7 Enlarged view of region B in the middle;

[0033] Figure 9 Schematic diagram of the structure of the filtration device for a fan provided in the embodiment of this utility model Figure 3 ;

[0034] Figure 10 for Figure 9 Enlarged view of region C in the middle;

[0035] Figure 11 Schematic diagram of the filter base provided in this embodiment of the utility model Figure 2 ;

[0036] Figure 12 for Figure 11 A magnified view of region D in the middle.

[0037] Explanation of reference numerals in the attached figures:

[0038] 11-Filter base; 12-Mask; 13-Filter chamber; 14-Fixed air guide structure; 15-Ventilation port; 16-Snap-on structure; 17-Drain outlet; 18-Wide baffle; 19-Reinforcing rib; 20-Positioning pin; 21-Positioning slot; 22-Glue strip mounting slot; 23-Anti-backflow boss. Detailed Implementation

[0039] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0040] As the air purification barrier of a fan system, the performance of fan filters directly affects the stability of system operation, equipment lifespan, and output air quality. Common fan filters suffer from a series of unavoidable drawbacks: First, high filtration precision designs often result in air resistance exceeding 150 Pa, increasing system energy consumption by 10% to 15%; simplifying the structure to reduce air resistance leads to decreased filtration efficiency, and particulate matter exacerbates equipment wear. Second, maintenance is cumbersome; existing bolt or hard-clamp structures require special tools for disassembly and assembly, with each filter replacement taking 3 to 4 minutes and prone to secondary dust pollution due to disturbance. Furthermore, product adaptability is poor, often requiring customization based on the shape and size of the air outlet, resulting in low versatility and increased costs; long-term operation and vibration can easily cause seal failure, with system air leakage rates reaching over 5%, severely impacting filtration. Finally, insufficient structural strength and unreasonable rigidity design of the support frame make them prone to deformation under high wind speeds (≥10 m / s) or negative pressure, leading to filter media damage and reducing their average lifespan to only 1 to 3 months, resulting in high maintenance frequency and costs.

[0041] See Figures 1 to 12 This utility model provides a filtration device for a fan, comprising: a filter base 11 for detachable installation on a fan flange; a face shield 12 detachably connected to the filter base 11, forming a filter cavity 13 for accommodating filter media between the face shield 12 and the filter base 11; a fixed air guide structure 14 formed on the face shield 12, and integrally formed with the face shield 12; and the fixed air guide structure 14 is provided with a plurality of fixed-shape ventilation openings 15; wherein the face shield 12 and the filter base 11 have mating surfaces that cooperate with each other, and when the two are assembled in place, the front projections of the face shield 12 and the filter base 11 cover the ventilation openings 15 to form a sealed interface.

[0042] Specifically, in this embodiment, the filter base 11 and the mask 12 are made of ABS material, which combines good mechanical strength and toughness. This allows the components to withstand the vibration and airflow pressure of the fan system, making them less prone to brittle fracture or permanent deformation. This ensures the reliability and durability of the quick-release buckles, positioning structure, and thin-walled parts under repeated disassembly and long-term use. The mask 12 and the fixed air guide structure 14 are integrally formed, resulting in no assembly gaps on the front of the mask 12 and better sealing. Furthermore, this embodiment optimizes the machining precision of the mating surface between the mask 12 and the filter base 11, achieving no visible gaps on the front after the mask 12 and filter base 11 are mated. This eliminates airflow short-circuiting within the filtration device and ensures that all airflow passes through the filter material. When the mask 12 and filter base 11 are assembled, there are no visible gaps when viewed from the front of the mask 12; that is, the ventilation opening 15 of the fixed air guide structure 14 is not exposed, and there are no other assembly gaps. The face mask 12 is detachably mounted on the filter base 11, and a filter chamber 13 is formed between the face mask 12 and the filter base 11. The filter chamber 13 is used to accommodate filter media. When the filter device is installed on the fan, fresh air can only enter the fan after being filtered by the filter media in the filter chamber 13, in order to prevent unfiltered particles from entering the fan and causing wear to the internal components of the fan.

[0043] In one embodiment of this application, the filter base 11 is provided with a snap-fit ​​structure 16, and the filter base 11 can be detachably installed on the fan flange through the snap-fit ​​structure 16; wherein, the snap-fit ​​structure 16 includes multiple snaps.

[0044] Specifically, such as Figure 12 As shown, in this embodiment, the filter base 11 is provided with four snap-fit ​​structures 16, respectively located on both sides of the filter base 11; each snap-fit ​​structure 16 has three layers of snaps. This allows the filter base 11 to be installed more securely on the fan flange, and the multiple layers of snaps prevent the filter base 11 from loosening due to vibration or airflow impact, enhancing the connection stability between the filter base 11 and the fan flange. Furthermore, the filter base 11 can also be provided with threaded holes, allowing screws to be used to fix the filter base 11 to the fan flange. The dual installation mode of "snap-fit ​​+ screw" can flexibly adapt to different specifications of fan flanges, and the modular structure design can reduce customization requirements, improve universal adaptability, and reduce production and inventory costs. The three layers of snaps on the outer side of the filter base 11 sequentially achieve guiding, positioning, and anti-loosening functions; the four reserved threaded holes can form a dual installation mode of tool-free insertion and screw fastening, which can be flexibly selected according to different operating conditions.

[0045] Among them, the three-layer snap-on installation structure enables tool-free disassembly and assembly, with a single disassembly and assembly time of less than or equal to 60 seconds, which is more than 80% more efficient than the traditional structure; in addition, the mask 12 and the filter base 11 can be quickly and safely separated, which can prevent dust leakage during the replacement of filter media and avoid secondary pollution.

[0046] In one embodiment of this application, the side profile of the mask 12 is a smoothly transitioned continuous curved surface.

[0047] Specifically, such as Figure 5 As shown, in this embodiment, the mask 12 adopts a continuous streamlined design with no right angles or straight edges on its sides. This can completely eliminate dead corners for water accumulation and prevent scale buildup. It can also optimize the airflow path and reduce wind resistance. At the same time, the smooth transition of the connecting curved surface on the side of the mask 12 can improve operational safety and prevent sharp sides from scratching the operator.

[0048] The seamless front sealing design ensures that airflow passes completely through the filter material without short-circuiting or loss, and the filtration efficiency for PM2.5 and other particulate matter is consistently greater than or equal to 95%. At the same time, through streamlined structure and precise sealing optimization, the system wind resistance can be controlled below 120Pa, effectively reducing fan energy consumption and achieving a balance between high-efficiency filtration and energy-saving operation.

[0049] In one embodiment of this application, the end of the mask 12 is symmetrically provided with a drain outlet 17, which extends to the edge of the mask 12.

[0050] Specifically, such as Figure 1 As shown, in this embodiment, two drain ports 17 are symmetrically arranged at the bottom of the mask 12. The drain ports 17 extend to the edge of the mask 12, which can realize the rapid drainage of condensate and avoid water accumulation in the filter chamber 13.

[0051] In one embodiment of this application, widened baffles 18 are provided on both sides of the mask 12, and reinforcing ribs 19 are provided on the inner side of the mask 12.

[0052] Specifically, such as Figure 4 As shown, in this embodiment, widened baffles 18 are provided on both sides of the mask 12, and reinforcing ribs 19 are provided longitudinally on the inner side of the mask 12. The structure of the widened baffles 18 and reinforcing ribs 19 can increase the overall rigidity and protective capability of the mask 12. In addition, the lateral protection area is increased by 40% compared with the traditional structure, which effectively enhances the deformation resistance of the structure. Among them, the core components of this embodiment are made of ABS engineering plastic material. With the reinforcement design of the widened baffles 18 and reinforcing ribs 19 of the mask 12, the filtration device can still maintain its shape stability under high wind speed (≥10 m / s) and vibration conditions of 10Hz to 50Hz. This significantly reduces the risk of filter material damage and extends the service life to 6 to 8 months, thereby reducing maintenance costs.

[0053] In one embodiment of this application, the mask 12 and the filter base 11 are detachably connected by at least one set of quick-release structures; the quick-release structure includes a positioning pin 20 disposed on one side and a positioning slot 21 disposed on the other side.

[0054] The quick-installation structure is offset at both ends of the mask 12 and / or the filter base 11.

[0055] The positioning pin 20 and / or positioning slot 21 are double-sided edge structures.

[0056] Specifically, such as Figure 9 As shown, in this embodiment, the face mask 12 and the filter base 11 adopt a quick-assembly structure with four sets of positioning pins 20 and positioning slots 21 corresponding to each other, achieving rapid docking while ensuring positioning accuracy and avoiding assembly misalignment. The quick-assembly structure adopts a staggered layout, and assembly cannot be completed if the alignment is not correct; this allows the installation operation to achieve correct assembly without relying on the operator's experience, reducing rework rate and shortening assembly time; the streamlined, non-sharp-angled structure on the side of the face mask 12 ensures the safety of disassembly and assembly operations. A raised logo is provided on the front of the face mask 12, which can make the installation direction clear to the operator, further avoiding incorrect installation.

[0057] In this embodiment, two of the four quick-assembly structures employ a double-sided edge structure for the positioning pins 20 and positioning slots 21. This allows the positioning components to be constrained from both sides during docking, thus providing a more balanced and smooth guiding effect. Furthermore, this symmetrically reinforced double-sided edge structure enhances the local deformation and wear resistance of the positioning pins 20 and positioning slots 21, enabling the quick-assembly structure to maintain shape stability under repeated disassembly and assembly or long-term vibration conditions.

[0058] In one embodiment of this application, a sealing strip mounting groove 22 is provided on the side of the filter base 11 away from the mask 12, and a sealing strip is installed in the sealing strip mounting groove 22.

[0059] Specifically, such as Figure 8 As shown, in this embodiment, the position of the sealing strip mounting groove 22 is adjusted towards the inner side of the filter base 11 structure, so that the sealing strip is subjected to more uniform pressure during assembly, thereby improving the sealing reliability and durability between the filter base 11 and the fan flange. By integrating a seamless front seal, an optimized back seal, and streamlined side protection, a three-in-one sealing structure is constructed, fundamentally improving sealing reliability and filtration efficiency. The three-in-one sealing structure ensures an overall air leakage rate of less than or equal to 2%; the combination of streamlined sides and drain outlets significantly improves the structure's waterproof and dustproof capabilities, enabling the filtration device to stably adapt to high humidity and dusty working environments.

[0060] In one embodiment of this application, the fixed air guide structure 14 is provided with an anti-backflow protrusion 23 at the bottom of the vent 15 to prevent water from flowing back into the vent 15.

[0061] Specifically, in this embodiment, an anti-backflow protrusion 23 is provided at the bottom of the vent 15. The anti-backflow protrusion 23 can prevent splashed water from flowing directly back into the groove, avoiding water accumulation in the groove or water flow entering the vent 15 and affecting the normal operation of the filter material or structure inside the filter device. At the same time, the anti-backflow protrusion 23 can block the airflow path of the rear air intake, preventing the airflow from flowing back to the initial position, thereby ensuring the stability of the airflow direction.

[0062] Specifically, the installation and maintenance process of the filter device in this embodiment is efficient, convenient, and reliable. During installation, first identify the direction by looking at the raised logo on the front of the faceplate 12, and align the entire filter device with the fan flange. The filter device and the fan flange can be fixed in two ways: one is the quick-insert type, which involves pushing it in until a "click" sound is heard from the buckle structure 16, at which point the assembly is complete and the sealing surface automatically tightens; the other is the screw-fixed type, which involves pushing it in first and using the buckle structure 16 for initial positioning, and then using stainless steel screws to lock it through the pre-drilled threaded holes in the housing. This is suitable for harsh working conditions such as high vibration. For maintenance and disassembly, the quick-insert type can be pulled out by pressing the buckle release arms on both sides, while the screw-fixed type requires removing the screws first before operating the buckles. Filter media replacement is performed by pressing the quick-release structure on the side of the faceplate 12 to safely and dust-free separate the faceplate 12 from the filter base 11. During cleaning, the surface can be rinsed directly using the drain port of the faceplate 12, and the elasticity of the buckles and the integrity of the sealing surface should be checked regularly. All core components in this embodiment are injection molded from high-performance ABS engineering plastics. The tolerance of key assembly dimensions is strictly controlled within ±0.15mm, ensuring overall strength, corrosion resistance, and consistency in mass production. Elastic silicone gaskets are embedded in the sealing parts to ensure resilience and sealing durability after long-term pressure.

[0063] The combination of a three-layer snap-fit ​​structure ("guiding + positioning + anti-detachment") and pre-drilled threaded holes enables both tool-free quick installation and threaded fastening, balancing convenience with reliability under harsh operating conditions. Furthermore, through integrated design, functions such as lateral protection, drainage diversion, installation guidance, and safety protection are integrated into a single component of the mask 12 and filter base 11, optimizing costs while enhancing structural integrity and functional adaptability. Simultaneously, this embodiment constructs a three-in-one sealing structure consisting of a gapless front seal, an optimized back seal, and streamlined side protection, fundamentally improving sealing reliability and filtration efficiency. The introduction of a snap-fit ​​quick-separation structure enables tool-free and dust-free separation of the mask 12 and filter base 11, completely avoiding secondary contamination during filter replacement and significantly improving maintenance efficiency and user experience.

[0064] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A filtering device for a fan, characterized in that, include: Filter base (11) for detachable installation on the fan flange; A face mask (12) is detachably connected to the filter base (11) and forms a filter cavity (13) between the face mask (12) and the filter base (11) for accommodating filter media. A fixed air guide structure (14) is formed on the mask (12) and is integrally formed with the mask (12); and the fixed air guide structure (14) is provided with a plurality of fixed-shape ventilation openings (15). The mask (12) and the filter base (11) have mating surfaces that cooperate with each other. When the two are assembled in place, the front projections of the mask (12) and the filter base (11) cover the vent (15) to form a sealed interface.

2. The filtration device for a fan according to claim 1, characterized in that, The filter base (11) is provided with a snap-fit ​​structure (16), and the filter base (11) can be detachably installed on the fan flange through the snap-fit ​​structure (16); wherein, the snap-fit ​​structure (16) includes multiple snap-fits.

3. The filtering device for a fan according to claim 1, characterized in that, The side profile of the mask (12) is a smooth, continuous curved surface.

4. The filtering device for a fan according to claim 1, characterized in that, The mask (12) has symmetrically arranged drain outlets (17) at its ends, and the drain outlets (17) extend to the edge of the mask (12).

5. The filtering device for a fan according to claim 1, characterized in that, The mask (12) is provided with widened baffles (18) on both sides, and the mask (12) is provided with reinforcing ribs (19) on the inner side.

6. The filtering device for a fan according to claim 1, characterized in that, The mask (12) and the filter base (11) are detachably connected by at least one set of quick-release structures; the quick-release structure includes a positioning pin (20) on one side and a positioning slot (21) on the other side.

7. The filtering device for a fan according to claim 6, characterized in that, The quick-release structure is offset at both ends of the face mask (12) and / or the filter base (11).

8. The filtering device for a fan according to claim 6, characterized in that, The positioning pin (20) and / or the positioning slot (21) are double-sided structures.

9. The filtering device for a fan according to claim 1, characterized in that, The filter base (11) has a rubber strip mounting groove (22) on the side away from the mask (12), and a sealing rubber strip is installed in the rubber strip mounting groove.

10. The filtration device for a fan according to claim 1, characterized in that, The fixed air guide structure (14) is provided with an anti-backflow protrusion (23) at the bottom of the ventilation opening (15) to prevent water from flowing back into the ventilation opening (15).

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