A multi-layer filter element structure for an air filter

Abstract

The utility model discloses a multilayer filter core structure of air filter, including base, by the first net board and second net board constitute outer filter screen, fine filter screen, activated carbon filter screen, cleaning device and auxiliary device, and the base inner wall is equipped with vertical slide rail, and fine filter screen and activated carbon filter screen edge are equipped with the slider matching with slide rail, and fine filter screen top is equipped with annular handle, and activated carbon filter screen top is equipped with the flange adaptation with outer filter screen top buckle, the utility model discloses beneficial effect is: this technical scheme is through to the system optimization of pull -out structure, buckle connection, locking mechanism and surface treatment, has solved the core pain point of traditional filter core, has improved the practicality and reliability of air filter significantly.

Description

Technical Field

[0001] This utility model relates to the field of air filter technology, and in particular to a multi-layer filter element structure for an air filter. Background Technology

[0002] In traditional multi-layer filters, the fine filter and activated carbon filter are usually glued or bolted to the inside of the outer filter. The outer filter must be removed to clean or replace the inner filter. For example, replacing the HEPA fine filter requires first removing the bolts securing the outer filter (average removal time ≥ 10 minutes), then separating the adhesive structure between the inner and outer filters (average time ≥ 5 minutes). This results in excessive downtime for air purifier maintenance (total maintenance time ≥ 20 minutes per session), affecting the continuous operating efficiency of the equipment.

[0003] In existing filter cleaning devices, the collection rods for impurities are often magnetically attached to the surface of the brush rod. However, the magnetic adhesion is significantly affected by vibration (such as the 10-50Hz vibration generated by an air purifier fan), causing the rods to easily shift or detach (detachment rate >30%), resulting in the cleaned impurities scattering into the filter element. Furthermore, fine impurities can easily leak through the gaps between the rods and the brush rod (collection efficiency ≤85%), requiring frequent disassembly and cleaning of the entire rod, further increasing maintenance workload.

[0004] Existing technologies mostly focus on optimizing a single structure (such as increasing the number of filter layers or replacing filter materials), failing to address the synergistic issues of "maintenance convenience, structural stability, and durability" from a systemic perspective. For example, some solutions improve the stability of the filter rod by increasing magnetic strength, but do not solve the problem of impurity leakage; some solutions use thicker springs to extend service life, but do not optimize the mechanical locking structure of the screen connection, resulting in limited improvement effects.

[0005] In summary, the existing multi-layer filter structure of air filters has problems such as cumbersome maintenance of internal filters, unstable impurity collection by cleaning devices, easy loosening of external filter connections, and insufficient durability of core components. There is an urgent need to achieve a balance between efficient filtration and convenient maintenance through structural innovation. Utility Model Content

[0006] The main technical problem solved by this utility model is to provide a multi-layer filter element structure for an air filter, thereby solving one or more of the problems mentioned above in the prior art.

[0007] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a multi-layer filter element structure for an air filter, including a base, an outer filter composed of a first mesh plate and a second mesh plate, a fine filter, an activated carbon filter, a cleaning device, and an auxiliary device. Its innovation lies in that: the inner wall of the base is provided with a vertical slide rail, the edges of the fine filter and the activated carbon filter are provided with sliders that match the slide rail, the top of the fine filter is provided with a ring handle, and the top of the activated carbon filter is provided with a flange that matches the buckle on the top of the outer filter.

[0008] In some embodiments, the cleaning device includes a brush rod and a groove rod, the groove rod being connected to the brush rod via a snap-fit ​​structure, the snap-fit ​​structure including a T-shaped groove on the outside of the brush rod and an elastic snap on the inside of the groove rod, and a threaded, detachable collection box being provided at the bottom of the groove rod.

[0009] In some embodiments, the auxiliary device includes a first U-shaped groove, a second U-shaped groove, a bolt, and a spring. The first U-shaped groove is disposed on a first mesh plate, and the second U-shaped groove is disposed on a second mesh plate. When the first mesh plate and the second mesh plate are closed, the first U-shaped groove and the second U-shaped groove are combined to form a U-shaped locking groove. The second mesh plate is provided with shaft seats on both sides of the second U-shaped groove, and the shaft seats are provided with shaft holes. The tail end of the bolt is provided with a rotating shaft that matches the shaft hole, and the head of the bolt is provided with a locking nut. The spring is sleeved on the bolt and located inside the locking nut.

[0010] In some embodiments, the inner wall of the slide rail is provided with a wear-resistant coating, the surface of the slider is covered with a silicone pad layer, and the contact surface between the flange and the top buckle of the outer filter screen is provided with anti-slip texture.

[0011] The beneficial effects of this utility model are: by systematically optimizing the pull-out structure, snap-fit ​​connection, locking mechanism and surface treatment, this technical solution solves the core pain points of traditional filter elements and significantly improves the practicality and reliability of air filters. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0013] Figure 1 This is a schematic diagram of the multi-layer filter element structure of an air filter according to the present invention.

[0014] Figure 2 yes Figure 1 A partial structural diagram.

[0015] Figure 3This is a schematic diagram of the assembly structure of the base, fine filter screen and activated carbon filter screen of a multi-layer filter element structure of an air filter according to this utility model.

[0016] Figure 4 yes Figure 3 A schematic diagram of the cross-sectional structure.

[0017] Figure 5 This is a schematic diagram of the base of a multi-layer filter element structure for an air filter according to this utility model.

[0018] Figure 6 This is a schematic diagram of the activated carbon filter screen of a multi-layer filter element structure of an air filter according to this utility model.

[0019] Figure 7 This is a schematic diagram of the fine filter screen of a multi-layer filter element structure of an air filter according to this utility model.

[0020] Figure 8 This is a schematic diagram of a cleaning device for a multi-layer filter element structure of an air filter according to the present invention.

[0021] Figure 9 yes Figure 8 Cross-sectional view. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] like Figures 1 to 9 As shown, the present invention includes a multi-layer filter element structure for an air filter. Through the refined design of the pull-out installation structure, the snap-fit ​​connection and collection structure of the cleaning device 500, the docking and locking structure of the auxiliary device 600, and the surface optimization treatment, the problems of cumbersome maintenance, insufficient connection stability, and low impurity collection efficiency of existing filter elements are solved. The following is a detailed description of each structure, its working principle, and its advantages.

[0024] The implementation method of the pull-out installation structure is as follows:

[0025] Vertical slide rail 101: Two vertically extending slide rails are symmetrically arranged on the inner wall of the base 100. They are made of aluminum alloy extrusion molding and have a concave cross-section (groove width 8mm, depth 5mm). The inner wall of the slide rail is coated with a 0.2mm thick polytetrafluoroethylene wear-resistant coating (friction coefficient ≤0.05).

[0026] Matching slider 102: Fine filter (300) (HEPA material, pore size 0.3μm) and activated carbon filter 400 (columnar activated carbon filling, density 0.5g / cm³) 3 The two sides are integrally molded ABS engineering plastic sliders 102. The thickness of slider 102 is matched with the width of the slide rail groove (gap 0.1mm). The surface is covered with a 1mm thick silicone pad (hardness 60 Shore A).

[0027] Operating section: A stainless steel ring handle 301 with a diameter of 3cm (frosted surface, friction force ≥30N) is welded to the center of the top of the fine filter screen 300 for easy manual pulling.

[0028] Positioning part: The outer ring of the top of the activated carbon filter screen 400 is provided with an annular flange (5mm wide and 2mm thick). The lower surface of the flange is provided with a groove that matches the inner buckle (plastic barb structure) on the top of the outer filter screen. The buckle and the groove are interference fit by 0.2mm.

[0029] Installation process: Align the sliders 102 of the fine filter screen 300 and the activated carbon filter screen 400 with the slide rail inlet of the base 100, and push them vertically into the bottom along the slide rail. At this time, the flange groove of the activated carbon filter screen 400 is engaged with the top of the outer filter screen to achieve axial positioning.

[0030] Disassembly process: Pull the fine filter screen 300 upwards using the ring handle 301, and the slider 102 can be pulled out by sliding along the slide rail. The activated carbon filter screen 400 will disengage from the buckle simultaneously with the outer filter screen during disassembly.

[0031] The advantages of a pull-out installation structure are as follows:

[0032] Convenience: The internal filter has an independent pull-out design, which can be maintained without removing the external filter, reducing maintenance time by 60% (from the traditional 20 minutes to 8 minutes);

[0033] Stability: The precise fit between the slide rail and the slider 102, as well as the flange snap-fit ​​positioning, ensures that the radial wobble of the filter screen is ≤0.5mm during operation;

[0034] Durability: The PTFE coating makes the slide rail resistant to more than 5,000 wear cycles, and the silicone pad layer controls the pulling noise to below 40dB (better than the industry average of 55dB).

[0035] The implementation method of the snap-fit ​​connection of the cleaning device 500 is as follows:

[0036] Brush handle 510 and grooved handle 520: Brush handle 510 (10mm diameter, nylon material, 15mm bristle length, 30 bristles / mm) 2The outer side has a T-shaped slot 511 (6mm wide and 4mm deep) along the axial direction; the inner side of the slot rod 520 (PP material, U-shaped cross section, 12mm opening width) is integrally formed with a polyoxymethylene elastic buckle 521 (2mm thick, elastic deformation range ±3mm), and the buckle head is a "T" shaped structure (7mm wide laterally) that matches the T-shaped slot 511.

[0037] Detachable collection section: The bottom of the 520 groove rod is connected to the collection box (100cm³) via an M4 thread. 3 The connection is equipped with a 1mm diameter silicone sealing ring; the opening edge of the groove rod 520 is pasted with a 0.5mm thick soft rubber sealing strip (3mm wide), and the inner wall is equipped with an annular block (5mm high, with a depth ratio of 1:3 to the groove rod 520).

[0038] Assembly process: The elastic buckle 521 of the groove rod 520 is aligned with the T-shaped groove 511 of the brush rod 510, and the axial sliding engagement is achieved. The rubber sealing strip is attached to the surface of the outer filter screen to form a closed space.

[0039] Cleaning process: The brush rod 510 swings to sweep away impurities from the outer filter screen. The impurities fall into the groove rod 520 due to inertia. The annular block prevents backflow, and the sealing strip prevents leakage.

[0040] Maintenance process: The collection box can be disassembled and the impurities poured out by rotating it, without removing the trough rod 520.

[0041] The advantages of the snap-fit ​​connection of the cleaning device 500 are as follows:

[0042] Connection reliability: The static friction of the T-shaped buckle is ≥20N, and there is no detachment under vibration test (10-200Hz) (the detachment rate of traditional magnetic connection is >30%).

[0043] Collection efficiency: The annular baffle and sealing strip work together to increase the impurity collection rate to 98% (compared to about 85% for traditional structures);

[0044] Convenience of maintenance: The collection box can be disassembled independently, and the emptying time is less than 10 seconds, avoiding contact and contamination by impurities.

[0045] The implementation method of the docking locking structure of the auxiliary device 600 is as follows:

[0046] The splicing groove is as follows: the first mesh plate 210 (stainless steel material, 2mm hole diameter) is provided with a first U-shaped groove 601 (groove depth 8mm), and the second mesh plate 220 is provided with a second U-shaped groove 602 (groove depth 8mm) at the corresponding position. After the two mesh plates are joined together, a complete U-shaped locking groove (total depth 16mm) is formed. The second mesh plate 220 is welded with a shaft seat 603 (thickness 5mm) on both sides of the second U-shaped groove 602. The shaft seat 603 has a shaft hole with a diameter of 6mm.

[0047] Locking rod: The bolt rod 605 (stainless steel, 10mm in diameter) has a rotating shaft 604 (5.9mm in diameter, 0.1mm clearance) at the end that matches the shaft hole, an M8 locking nut 606 (made of 45 steel) at the head, and a spring 607 (1mm wire diameter, 20mm free length, 5N / mm elastic coefficient) in the middle.

[0048] Locking process: After the two mesh plates are closed, the first U-shaped groove 601 and the second U-shaped groove 602 form a U-shaped locking groove. Rotate the bolt 605 to make the head embed into the locking groove. The spring 607 is compressed to generate a pre-tightening force (compression amount 5mm, elastic force 25N). Tighten the locking nut 606 to complete the locking.

[0049] Unlocking process: Loosen the locking nut 606, the spring 607 returns to its original position and pushes the bolt 605 out of the locking groove, and rotates around the shaft 604 to open.

[0050] The advantages of the docking locking structure of the auxiliary device 600 are as follows:

[0051] Connection strength: The U-shaped locking groove and the bolt 605 have a surface contact design, and with the preload of the spring 607, the tensile strength is ≥300N (the tensile strength of the traditional single spring 607 structure is ≤150N);

[0052] Ease of operation: The 604-type pivot design allows the bolt 605 to rotate up to 180°, enabling a single person to lock / unlock (operation time < 30 seconds);

[0053] Fatigue resistance: Spring 607 is made of 65Mn material and has a fatigue life of >10,000 cycles (compared to about 5,000 cycles for traditional spring 607).

[0054] Surface optimization treatment:

[0055] Wear-resistant layer: The inner wall of the slide rail is coated with polytetrafluoroethylene with a thickness of 0.2mm and a surface hardness of HV300 (improving wear resistance by 30%).

[0056] Buffer pad: The silicone pad on the surface of slider 102 has a Shore hardness of 60A and a rebound rate of >90% when the compression is 10%; Anti-slip structure: The contact surface between the flange of activated carbon filter 400 and the outer filter is provided with a 0.5mm deep diamond anti-slip texture (texture spacing 2mm), which increases the coefficient of friction to 0.8 (approximately 0.4 for traditional smooth surfaces).

[0057] The wear-resistant layer reduces frictional loss between the slide rail and the slider 102, the buffer pad absorbs the impact of pulling, and the anti-slip texture increases the contact friction of the positioning part.

[0058] The wear-resistant layer of the slide rail enables a lifespan of 5,000 pull-out cycles (the industry average is 3,000 cycles), and the buffer pad layer reduces the wear rate of the slider 102 by 50%.

[0059] The anti-slip texture increases the static friction between the flange and the buckle by 100%, preventing axial movement of the filter screen during operation.

[0060] The working principle of this technical solution is as follows:

[0061] (1) Assembly process

[0062] External filter assembly: The first screen plate 210 and the second screen plate 220 are joined together, the U-shaped locking grooves are aligned, the rotating bolt 605 is embedded in the groove, and the spring 607 is pre-tightened and then the locking nut 606 is fixed.

[0063] Internal filter installation: fine filter 300, activated carbon filter 400 slider 102 are pushed in along the slide rail of base 100, and the flange is snapped into position with the outer filter;

[0064] Cleaning device 500 assembly: The groove rod 520 is fixed to the brush rod 510 by a T-shaped buckle, and the collection box is threaded to the bottom of the groove rod 520.

[0065] (2) Operation process

[0066] Filtration process: Air passes through an external filter (intercepting particles >2mm) → a fine filter 300 (intercepting particles >0.3μm) → an activated carbon filter 400 (adsorbing formaldehyde / TVOC), achieving a purification efficiency of 99.97%.

[0067] Cleaning process: The servo motor drives the brush rod 510 to swing, and impurities are swept into the groove rod 520. The annular block and sealing strip prevent leakage, and the collection box is disassembled and emptied periodically.

[0068] Maintenance process: Pull out the internal filter screen for cleaning using the ring handle 301, and loosen the auxiliary device 600 nut to separate the external filter screen.

[0069] The advantages of this technical solution are:

[0070] Maintenance efficiency: The internal filter pull-out design + cleaning device with 500 independent collection boxes reduces maintenance time by 60% and downtime by 50%;

[0071] Structural stability: The auxiliary device 600 double U-shaped groove locking + spring 607 pre-tightening ensures that the external filter connection has a lifespan of 1000 disassembly and assembly cycles without loosening (the loosening rate of traditional structures is >50% after 500 cycles).

[0072] Filtration performance: The multi-layer filter works synergistically to achieve a filtration efficiency of 99.97% for 0.3μm particles, which is superior to the industry standard (99.95%).

[0073] Durability: Surface optimization treatment increases the lifespan of core components to over 5,000 cycles and reduces the overall failure rate by 40%.

[0074] In summary, this implementation method addresses the core pain points of traditional filter elements by systematically optimizing the pull-out structure, snap-fit ​​connection, locking mechanism, and surface treatment, significantly improving the practicality and reliability of air filters.

[0075] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A multi-layer filter core structure of an air filter, comprising a base (100), an outer filter screen composed of a first screen plate (210) and a second screen plate (220), a fine filter screen (300), an activated carbon filter screen (400), a cleaning device (500), and an auxiliary device (600), characterized in that: The base (100) has a vertical slide rail (101) on its inner wall. The edges of the fine filter (300) and the activated carbon filter (400) are provided with sliders (102) that match the slide rail. The top of the fine filter (300) is provided with a ring handle (301), and the top of the activated carbon filter (400) is provided with a flange that matches the buckle on the top of the outer filter.

2. A multi-layered filter cartridge structure for an air filter according to claim 1, wherein: The cleaning device (500) includes a brush rod (510) and a groove rod (520). The groove rod (520) is connected to the brush rod (510) by a snap-fit ​​structure. The snap-fit ​​structure includes a T-shaped groove (511) on the outside of the brush rod (510) and an elastic snap (521) on the inside of the groove rod (520). The bottom of the groove rod (520) is provided with a threaded detachable collection box.

3. A multi-layered filter cartridge structure for an air filter according to claim 1, wherein: The auxiliary device (600) includes a first U-shaped groove (601), a second U-shaped groove (602), a bolt (605), and a spring (607). The first U-shaped groove (601) is disposed on the first mesh plate (210), and the second U-shaped groove (602) is disposed on the second mesh plate (220). When the first mesh plate (210) and the second mesh plate (220) are closed, the first U-shaped groove (601) and the second U-shaped groove (602) are connected. The assembly forms a U-shaped locking groove. The second mesh plate (220) is provided with a shaft seat (603) on both sides of the second U-shaped groove (602). The shaft seat (603) is provided with a shaft hole. The tail end of the bolt (605) is provided with a rotating shaft (604) that matches the shaft hole. The head of the bolt (605) is provided with a locking nut (606). The spring (607) is sleeved on the bolt (605) and located inside the locking nut (606).

4. The multi-layered filter cartridge structure of an air filter according to claim 1, wherein: The inner wall of the slide rail is provided with a wear-resistant coating, the surface of the slider (102) is covered with a silicone pad layer, and the contact surface between the flange and the top buckle of the outer filter screen is provided with anti-slip texture.

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