Multi-medium composite air filtration and purification device

Abstract

This invention relates to the technical field of air purification equipment, and more particularly to a multi-media composite air filtration and purification device, comprising a housing, a side plate connected to one side surface of the housing, and a top cover hinged to the upper end of one side surface of the housing. This multi-media composite air filtration and purification device, through the setting of a pull-and-release mechanism, ensures that during use, the filter cotton is clamped and fixed on both sides by long clamping strips and conical blocks, forming a continuous and stable compressive force on the sides of the filter cotton. This effectively prevents the filter cotton from loosening, warping, or shifting after wind impact and dust accumulation, fundamentally solving the problems of poor sealing and airflow short-circuiting in traditional filter cotton.

Description

Technical Field

[0001] This invention relates to the technical field of air purification equipment, and in particular to a multi-media composite air filtration and purification device. Background Technology

[0002] Multi-media composite air filtration and purification devices are air handling equipment that integrates multiple different filtration and purification media in a graded series according to the principle of "coarse first, fine second, physical first, chemical second / sterilization first". They are used to comprehensively remove solid particulate matter, gaseous pollutants and microorganisms from the air and are widely used in HVAC, clean rooms, medical, industrial and public buildings. Its core function is graded purification and synergistic effect: First, the pre-filter intercepts large particles such as dust and hair to protect the downstream. Then, the adsorption layer such as activated carbon removes formaldehyde, VOCs, odors and some harmful gases. Next, the HEPA layer efficiently captures fine particles such as PM2.5, pollen, bacteria and even viruses. Finally, it achieves integrated deep purification of particulate matter, gaseous pollutants and microorganisms, significantly improving indoor air quality and protecting downstream equipment. Common multi-media composite air filtration and purification devices generally adopt a flat and fixed structure for filter cotton. During long-term use, the filter cotton is prone to loosening and warping due to wind impact and impurity adsorption, which can lead to problems such as poor sealing and airflow short circuit. At the same time, the middle of the filter cotton is subjected to concentrated airflow, resulting in rapid local wear and low overall utilization. The replacement cycle is short and the consumables are wasted. In addition, the existing devices are cumbersome to disassemble and assemble, and the replacement of filter cotton can easily cause secondary dust pollution. Activated carbon is mostly an integral structure, which cannot achieve local replacement and has high maintenance costs.

[0003] To address the aforementioned issues, a search revealed patent CN216457715U, which discloses a multi-functional air purification filter for an air sterilizer. The patent states: "1. In this invention, the partition plate and connecting plate allow for easy cleaning of the interior of the main casing after a period of use. By manually pulling the connecting plate, the connecting plate can be pulled out of the placement slot, thereby pulling out the partition plate and the filter mechanism. This allows the user to separate and clean the pre-filter, HEPA filter, activated carbon filter, and odor filter individually, eliminating the need for a complete replacement and reducing cleaning costs. 2. In this invention, the movable plate and cleaning brush enable efficient cleaning of the surface..." When dust adheres to the surface, the cleaning brush can be removed from the storage compartment. The movable plate can then be rotated to change the brush's position. The user can then move the brush up and down to clean the surface of the main casing. After use, the cleaning brush can be returned to the storage compartment for easy re-use, improving the practicality of this invention. While the design incorporates a detachable multi-effect integrated filter, allowing for individual replacement of pre-filters, HEPA filters, and activated carbon, thus enhancing purification and daily cleaning, the lack of a filter tensioning and automatic lowering mechanism results in filter loosening, warping, and seal failure. Furthermore, the direct airflow causes rapid localized filter wear, and the inability to partially replace activated carbon leads to wasted consumables and high maintenance costs.

[0004] In light of this, in-depth research into the aforementioned issues led to the creation of this case. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-media composite air filtration and purification device to solve the problems mentioned in the background art, such as the filter cotton being prone to loosening, poor sealing, rapid wear, easy secondary pollution during replacement, and inconvenient maintenance during use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-media composite air filtration and purification device, comprising a housing and a pulling and extending mechanism.

[0007] A side plate is connected to one side surface of the box, and a top cover is hinged to the upper end of one side surface of the box. A pulling and extending mechanism is provided inside the box.

[0008] The pulling and releasing mechanism includes an inner support frame, with a long clamping strip connected to the outer ring surface of the inner support frame. One end of the long clamping strip is connected to an upper pull frame, and a connecting ring is connected to one side surface of the upper pull frame. Filter cotton is snapped into the inner ring surface of the long clamping strip. A first sealing plate is connected to one side surface of the box body, and a second spring is connected to one side surface of the first sealing plate.

[0009] Preferably, a limiting strip is connected to the lower surface of the long clamping strip, the limiting strip being a T-shaped strip, and a sliding groove is formed on the outer surface of the inner support frame, the sliding groove being a T-shaped groove, and the outer surface of the T-shaped strip is slidably connected to the inner surface of the T-shaped groove.

[0010] Preferably, one end of the long clamping strip is connected to a pull-down frame, and the outer surface of one end of the long clamping strip is connected to a connecting strip.

[0011] Preferably, one side surface of the connecting strip is connected to two sets of latching protrusions. The outer ring surface of one set of latching protrusions engages with the inner ring surface of the vertical through hole at one end of the long clamping strip, and the outer ring surface of the other set of latching protrusions engages with the inner ring surface of the vertical through hole of the pull-down frame. The inner ring surface of the long clamping strip is provided with a conical block, and the outer ring surface of the conical block is connected to the inner ring surface of the side vertical through hole of the filter cotton.

[0012] Preferably, a first spring is connected to one side surface of the connecting ring, a retaining ball is connected to the other end of the first spring, and a hook is connected to one end of the second spring. The outer ring surface of the hook abuts against the inner ring surface of the groove on one side of the retaining ball.

[0013] Preferably, a second sealing plate is connected to one side surface of the housing, and a third spring is connected to one side surface of the second sealing plate.

[0014] Preferably, a limiting post is connected to one side surface of the box, and a metal mesh is sleeved on the outer surface of the limiting post. The metal mesh and the box are fixed by bolts.

[0015] Preferably, the inner ring surface of the housing is connected to a first groove frame, and the inner ring surface of the first groove frame is fitted with a diffuser plate.

[0016] Preferably, the inner ring surface of the inner support frame is connected to a second groove frame, the inner ring surface of the second groove frame is snapped with a frame, the inner ring surface of the frame is connected to a placement box, the upper surface of the placement box is connected to a cover plate, and one side surface of the placement box is connected to a locking strip.

[0017] Preferably, the inner ring surface of the inner support frame is connected to a third groove frame, the inner ring surface of the third groove frame is fitted with a HEPA layer, a fan is connected to one side surface of the housing, and a baffle is connected to the top and bottom surface of the inner ring surface of the housing.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This multi-media composite air filtration and purification device, through the setting of the traction and release mechanism, uses long clamping strips and conical blocks to clamp and fix the filter cotton on both sides during use. This can form a continuous and stable pressure on the sides of the filter cotton, effectively preventing the filter cotton from loosening, curling, or shifting after wind impact and dust accumulation. It fundamentally solves the problems of poor sealing and airflow short circuits in traditional filter cotton. The T-shaped limiting strip at the bottom of the long clamping strip and the T-shaped sliding groove of the inner support frame cooperate with each other to ensure smooth sliding without jamming and prevent lateral displacement. This ensures that the filter cotton always maintains a flat, centered, and reliable sealing working state during the up and down movement. With the overall traction structure of the upper pull frame, lower pull frame and connecting strip, the filter cotton can slowly move down after adsorbing impurities and increasing in weight. The clean filter cotton area is automatically replenished into the working area, and the dirty filter cotton section is gradually moved down and stored. This significantly improves the overall utilization rate of the filter cotton, extends the replacement cycle, reduces consumable consumption and operating costs, and avoids local concentrated blockage that causes a sudden increase in wind resistance, ensuring the long-term stable operation of the device.

[0020] 2. This multi-media composite air filtration and purification device, through the coordinated arrangement of a metal mesh, a diffuser plate, layered filter media, and a sealing structure, allows for quick positioning of the metal mesh via limiting posts and secure fastening with bolts during use. This convenient and precise positioning effectively intercepts large particles of impurities, protecting the internal filter media from damage. The diffuser plate evenly disperses the incoming air, preventing concentrated airflow from directly impacting the center of the filter cotton, resulting in more even stress and dust accumulation on the filter cotton and further slowing down localized wear. The placement box features a compartmentalized independent structure, allowing for partial replacement and repair of the activated carbon adsorption material without requiring overall replacement, significantly reducing maintenance costs and consumable waste. The first and second sealing plates, along with the second and third springs, form an elastic sealing structure that maintains the cavity seal even during filter cotton movement, preventing air leakage and secondary pollution. The HEPA layer is secured by a third slot frame, ensuring stable installation and easy disassembly. Combined with a rear-end fan, it forms a stable negative pressure air duct, improving filtration efficiency and airflow uniformity. The entire device is simple to assemble and disassemble, easy to maintain, and reliable in operation, making it suitable for a wider range of scenarios and more practical. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the interlocking structure of the housing and side panels of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the interlocking structure of the housing and the top cover of the present invention;

[0024] Figure 4 This is a schematic diagram of the interaction between the first sealing plate and the second spring of the present invention.

[0025] Figure 5This is a schematic diagram of the structure in which the first groove frame and the air diffuser plate of the present invention cooperate.

[0026] Figure 6 This is a schematic diagram of the structure in which the frame and the placement box of the present invention cooperate with each other;

[0027] Figure 7 This is a schematic diagram of the structure in which the long clip and filter cotton of the present invention cooperate with each other;

[0028] Figure 8 This is a schematic diagram of the interaction between the pull-up frame and the connecting strip of the present invention;

[0029] Figure 9 For the present invention Figure 7 Enlarged structural diagram at point A in the middle.

[0030] In the diagram: 1. Box body; 2. Side panel; 3. Top cover; 4. Pull-out mechanism; 401. Inner support frame; 402. Long clamping strip; 403. Limiting strip; 404. Upper pull frame; 405. Lower pull frame; 406. Connecting strip; 407. Clip; 408. Conical block; 409. Filter cotton; 410. Connecting ring; 411. First spring; 412. Clamping ball; 413. First sealing plate; 414. Second spring; 415. Hook; 416. Second sealing plate; 417. Third spring; 5. Limiting post; 6. Metal mesh; 7. First channel frame; 8. Air diffuser; 9. Second channel frame; 10. Frame; 11. Placement box; 12. Cover plate; 13. Clamping strip; 14. Third channel frame; 15. HEPA layer; 16. Fan; 17. Baffle. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-9 The present invention provides a technical solution: a multi-media composite air filtration and purification device, comprising a housing 1 and a pulling and extending mechanism 4.

[0033] A side plate 2 is connected to one side surface of the box body 1, and a top cover 3 is hinged to the upper end of one side surface of the box body 1. A pulling and extending mechanism 4 is provided inside the box body 1.

[0034] The pulling and releasing mechanism 4 includes an inner support frame 401, with a long clamping strip 402 connected to the outer ring surface of the inner support frame 401. One end of the long clamping strip 402 is connected to an upper pull frame 404, and a connecting ring 410 is connected to one side surface of the upper pull frame 404. Filter cotton 409 is snapped onto the inner ring surface of the long clamping strip 402. A first sealing plate 413 is connected to one side surface of the box body 1, and a second spring 414 is connected to one side surface of the first sealing plate 413.

[0035] Furthermore, a limiting strip 403 is connected to the lower surface of the long clamping strip 402. The limiting strip 403 is a T-shaped strip. A sliding groove is provided on the outer surface of the inner support frame 401. The sliding groove is a T-shaped groove. The outer surface of the T-shaped strip is slidably connected to the inner surface of the T-shaped groove. Through the setting of the long clamping strip 402, the limiting strip 403 and the inner support frame 401, the filter cotton 409 can be laterally limited and vertically guided during use. The limiting strip 403 cooperates with the T-shaped sliding groove of the inner support frame 401, so that the long clamping strip 402 can only slide smoothly vertically, avoiding lateral offset and jamming, ensuring that the filter cotton 409 is always centered and not skewed during the up and down movement, and ensuring that the side sealing position of the filter cotton 409 is stable and reliable.

[0036] Furthermore, one end of the long clamping strip 402 is connected to a pull-down frame 405, and a connecting strip 406 is connected to the outer ring surface of one end of the long clamping strip 402. Through the arrangement of the long clamping strip 402, the pull-down frame 405 and the connecting strip 406, the bottom of the filter cotton 409 can be pulled and fixed during use. The pull-down frame 405 forms a whole with the long clamping strip 402 through the connecting strip 406, and together with the pull-up frame 404, it forms the upper and lower clamping structure of the filter cotton 409, providing continuous tension to the filter cotton 409, preventing the filter cotton 409 from loosening and wrinkling. At the same time, it serves as the force-bearing end for the downward movement of the filter cotton 409, so that the filter cotton 409 can move down smoothly with the pull-down frame 405 after dust accumulation.

[0037] Furthermore, one side surface of the connecting strip 406 is connected to two sets of latching protrusions 407. The outer ring surface of one set of latching protrusions 407 engages with the inner ring surface of the vertical through hole at one end of the long clamping strip 402, and the outer ring surface of the other set of latching protrusions 407 engages with the inner ring surface of the vertical through hole of the pull-down frame 405. The inner ring surface of the long clamping strip 402 is provided with a conical block 408, and the outer ring surface of the conical block 408 is connected to the inner ring surface of the side vertical through hole of the filter cotton 409. This is achieved through the connecting strip 406, latching protrusions 407, and long clamping strip 402. The design of the pull-down frame 405 and the conical block 408 allows for quick installation and reliable fixation of the filter cotton 409 during use. The two sets of latches 407 respectively connect the connecting strip 406 to the long clamping strip 402 and the pull-down frame 405 into one unit, eliminating the need for additional tools for disassembly and assembly. The conical block 408 engages with the holes on the side of the filter cotton 409, directly embedding the filter cotton 409 into the inner side of the long clamping strip 402, preventing the filter cotton 409 from shifting or loosening when impacted by airflow, while ensuring that the edges of the filter cotton 409 are evenly compressed to avoid air leakage from gaps.

[0038] Furthermore, a first spring 411 is connected to one side of the connecting ring 410, and a retaining ball 412 is connected to the other end of the first spring 411. A hook 415 is connected to one end of the second spring 414. The outer ring surface of the hook 415 abuts against the inner ring surface of the groove on one side of the retaining ball 412. Through the arrangement of the connecting ring 410, the first spring 411, the retaining ball 412, the second spring 414, and the hook 415, the filter cotton 409 can achieve elastic tension and automatic release in its initial state during use. During initial installation, the hook 415 and the connecting ring 410 are engaged, and the outer ring surface of the hook 415 abuts against the retaining ball 412. The first spring 411 provides elasticity to prevent the hook 415 from falling off. At the same time, the second spring 414 forms a pre-tension force to tighten the filter cotton 409. When the filter cotton 409 accumulates dust and becomes heavier, and the tension exceeds the set threshold, the filter cotton 409 slowly moves down under the action of gravity and the traction of the lower spring, achieving automatic replacement.

[0039] Furthermore, a second sealing plate 416 is connected to one side surface of the housing 1, and a third spring 417 is connected to one side surface of the second sealing plate 416. Through the arrangement of the housing 1, the second sealing plate 416 and the third spring 417, the filter cotton 409 can be sealed during the downward movement process. The second sealing plate 416 is engaged with the cavity formed by the housing 1 and the inner support frame 401 to ensure sealing, prevent air leakage and outflow of impurities, and at the same time provide a fulcrum for the installation of the third spring 417.

[0040] Furthermore, a limiting post 5 is connected to one side surface of the housing 1, and a metal mesh 6 is fitted on the outer surface of the limiting post 5. The metal mesh 6 and the housing 1 are fixed with bolts. Through the arrangement of the housing 1, the limiting post 5 and the metal mesh 6, large particulate impurities at the air inlet can be intercepted and protected during use. The limiting post 5 provides a positioning reference for the metal mesh 6, and the bolt fixing ensures that the metal mesh 6 is installed firmly and is easy to disassemble and assemble. The metal mesh 6 can effectively block hair, lint, and large particulate dust from entering the interior, avoiding these impurities from directly impacting the filter cotton 409 and causing local blockage. At the same time, it can be disassembled and cleaned regularly to extend the service life of the internal filter material.

[0041] Furthermore, the inner surface of the housing 1 is connected to a first groove frame 7, and the inner surface of the first groove frame 7 is fitted with a diffuser plate 8. Through the arrangement of the housing 1, the first groove frame 7 and the diffuser plate 8, the airflow can be evenly dispersed and rectified during use. The first groove frame 7 provides stable installation support for the diffuser plate 8. The diffuser plate 8, through the ventilation holes and guide grooves, evenly disperses the concentrated airflow to the windward side of the entire filter cotton 409, avoiding the airflow from directly impacting the middle of the filter cotton 409 for a long time, causing local rapid dust accumulation and blockage. This makes the filter cotton 409 more evenly stressed and accumulates dust, extending the overall service life of the filter cotton 409.

[0042] Furthermore, the inner ring surface of the inner support frame 401 is connected to a second groove frame 9, the inner ring surface of the second groove frame 9 is snapped with a frame 10, the inner ring surface of the frame 10 is connected to a placement box 11, the upper surface of the placement box 11 is connected to a cover plate 12, and one side surface of the placement box 11 is connected to a retaining strip 13. Through the arrangement of the inner support frame 401, the second groove frame 9, the frame 10, the placement box 11, the cover plate 12, and the retaining strip 13, the activated carbon adsorption material can be placed in separate compartments and replaced locally during use. The second groove frame 9 provides an installation track for the frame 10, the placement box 11 has a multi-compartment independent structure, the cover plate 12 can be opened individually, and the retaining strip 13 ensures that the placement box 11 is installed in place without loosening. When the activated carbon in a certain area becomes saturated prematurely, the corresponding placement box 11 can be removed and replaced individually without replacing the entire piece of activated carbon, which greatly reduces the cost of consumables and the workload of maintenance.

[0043] Furthermore, a third groove frame 14 is connected to the inner ring surface of the inner support frame 401, and a HEPA layer 15 is snapped onto the inner ring surface of the third groove frame 14. A fan 16 is connected to one side surface of the housing 1, and a baffle 17 is connected to the top and bottom surface of the inner ring surface of the housing 1. Through the arrangement of the inner support frame 401, the third groove frame 14, the HEPA layer 15, the fan 16, and the baffle 17, high-efficiency filtration and stable airflow guidance can be achieved during use. The third groove frame 14 ensures that the HEPA layer 15 is installed firmly and sealed reliably. The fan 16 provides stable negative pressure, allowing air to be filtered step by step through the filter cotton 409, activated carbon, and HEPA layer 15. The baffle 17 prevents the airflow from forming eddies in the housing 1 and prevents the airflow from impacting the clean part at the top of the filter cotton 409, ensuring that the airflow passes evenly through each filter layer along a preset path, thereby improving the overall filtration efficiency and airflow uniformity.

[0044] Working principle: First, the metal mesh 6 is fitted onto the limiting post 5 and fixed with bolts to complete the protection of the air inlet end. Then, the diffuser plate 8 is inserted into the first slot frame 7 inside the housing 1. The holes on the side of the filter cotton 409 are aligned with the conical blocks 408 on the long clamping strip 402 and embedded and fixed. Then, the locking protrusions 407 on the connecting strip 406 are respectively engaged with the vertical through holes of the long clamping strip 402, the upper pull frame 404, and the lower pull frame 405 to form the upper and lower end clamping structure of the filter cotton 409. Finally, the inner support frame 401 is installed into the housing 1, so that the limiting strip 403 at the bottom of the long clamping strip 402 slides into the inner support frame 1. The T-shaped groove of the support frame 401 is then used to connect the connecting ring 410 on the upper pull frame 404 to the hook 415 of the second spring 414 on one side of the first sealing plate 413, so that the hook 415 abuts against the groove of the retaining ball 412. The first spring 411 provides elastic pressure to prevent the hook 415 from falling off. The second spring 414 provides initial tension to the filter cotton 409. Then, the frame 10 is inserted into the second groove frame 9 on the inner support frame 401. The placement box 11 containing activated carbon is placed into the frame 10 and the cover plate 12 is closed and fixed by the retaining strip 13. Then, the HEP Layer A 15 is inserted into the third slot frame 14, and the second sealing plate 416 is snapped into the housing 1, so that the third spring 417 forms an elastic seal. The side plate 2 and the top cover 3 are installed to complete the device assembly. When in use, the fan 16 is turned on, and a negative pressure is formed in the housing 1. The air first passes through the metal mesh 6 to intercept large particles of impurities, and then is evenly dispersed by the diffuser plate 8 before being blown toward the filter cotton 409. After the filter cotton 409 is impacted by the airflow and the weight increases due to dust accumulation, when the tension exceeds the set threshold, the filter cotton 409, under the pull of gravity and the third spring 417, is pulled smoothly down along the slide groove of the inner support frame 401 through the long clamping strip 402. The dirty section is gradually collected, and the clean section is automatically replenished into the working area. Then, the air passes through the activated carbon placement box 11 to remove gaseous pollutants, and then passes through the HEPA layer 15 for high-efficiency filtration of fine particles. Finally, it is discharged from the fan 16. The baffle 17 prevents airflow turbulence. The second sealing plate 416 and the third spring 417 continuously seal the cavity to avoid air leakage and secondary pollution. When the filter cotton 409 moves to the bottom or the activated carbon is partially saturated, the top cover 3 and the side plate 2 are opened, and the filter cotton 409 is removed or the corresponding placement box 11 is replaced to complete the maintenance. The model of the fan 16 is: Nidec D06F-24B2S1.

[0045] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-media composite air filtration and purification device, comprising a housing (1) and a pulling and extending mechanism (4), characterized in that: A side plate (2) is connected to one side surface of the box (1), and a top cover (3) is hinged to the upper end of one side surface of the box (1). A pulling and releasing mechanism (4) is provided inside the box (1). The pulling and releasing mechanism (4) includes an inner support frame (401), with a long clamping strip (402) connected to the outer ring surface of the inner support frame (401), an upper pull frame (404) connected to one end of the long clamping strip (402), a connecting ring (410) connected to one side surface of the upper pull frame (404), a filter cotton (409) snapped onto the inner ring surface of the long clamping strip (402), a first sealing plate (413) connected to one side surface of the box body (1), and a second spring (414) connected to one side surface of the first sealing plate (413).

2. The multi-media composite air filtration and purification device according to claim 1, characterized in that: The lower surface of the long clamping strip (402) is connected to a limiting strip (403), which is a T-shaped strip. The outer surface of the inner support frame (401) is provided with a sliding groove, which is a T-shaped groove. The outer surface of the T-shaped strip is slidably connected to the inner surface of the T-shaped groove.

3. The multi-media composite air filtration and purification device according to claim 1, characterized in that: One end of the long clamping strip (402) is connected to a drop-down frame (405), and a connecting strip (406) is connected to the outer ring surface of one end of the long clamping strip (402).

4. The multi-media composite air filtration and purification device according to claim 3, characterized in that: Two sets of latches (407) are connected to one side surface of the connecting strip (406). The outer ring surface of one set of latches (407) engages with the inner ring surface of the vertical through hole at one end of the long clamping strip (402). The outer ring surface of the other set of latches (407) engages with the inner ring surface of the vertical through hole of the pull-down frame (405). A conical block (408) is provided on the inner ring surface of the long clamping strip (402). The outer ring surface of the conical block (408) is connected to the inner ring surface of the side vertical through hole of the filter cotton (409).

5. The multi-media composite air filtration and purification device according to claim 1, characterized in that: A first spring (411) is connected to one side surface of the connecting ring (410), and a retaining ball (412) is connected to the other end of the first spring (411). A hook (415) is connected to one end of the second spring (414), and the outer ring surface of the hook (415) abuts against the inner ring surface of the groove on one side of the retaining ball (412).

6. The multi-media composite air filtration and purification device according to claim 1, characterized in that: A second sealing plate (416) is connected to one side surface of the housing (1), and a third spring (417) is connected to one side surface of the second sealing plate (416).

7. The multi-media composite air filtration and purification device according to claim 1, characterized in that: A limiting post (5) is connected to one side surface of the box (1), and a metal mesh (6) is sleeved on the outer ring surface of the limiting post (5). The metal mesh (6) and the box (1) are fixed by bolts.

8. The multi-media composite air filtration and purification device according to claim 1, characterized in that: The inner surface of the housing (1) is connected to a first groove frame (7), and the inner surface of the first groove frame (7) is fitted with a diffuser plate (8).

9. The multi-media composite air filtration and purification device according to claim 1, characterized in that: The inner ring surface of the inner support frame (401) is connected to a second groove frame (9), the inner ring surface of the second groove frame (9) is snapped with a frame frame (10), the inner ring surface of the frame frame (10) is connected to a placement box (11), the upper side surface of the placement box (11) is connected to a cover plate (12), and one side surface of the placement box (11) is connected to a locking strip (13).

10. The multi-media composite air filtration and purification device according to claim 1, characterized in that: The inner ring surface of the inner support frame (401) is connected to a third groove frame (14), the inner ring surface of the third groove frame (14) is snapped with a HEPA layer (15), a fan (16) is connected to one side surface of the housing (1), and a baffle (17) is connected to the top surface of the inner ring surface of the housing (1).

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