A plasma-based air filtration device

Abstract

This invention provides a plasma-based air filtration device, belonging to the field of gas purification technology. It includes a multi-stage filter layer housing, on which independently detachable components are mounted a catalytic filter layer, an activated carbon particle filter layer, a HEPA filter layer, and a flexible plasma filter layer, forming a multi-layered synergistic filtration system. The plasma generated by the flexible plasma filter layer causes the harmful substances adsorbed within the activated carbon particles to be decomposed and eluted, thereby allowing the activated carbon particles to be recycled. This invention effectively achieves the adsorption and filtration of harmful substances in the gas and can also elute and purify the activated carbon particles in the activated carbon particle filter layer, enabling multiple recycling and reducing the cost of air purification. Furthermore, this elution method has a better elution effect than the commonly used photo-elution method.

Description

Technical Field

[0001] This invention relates to the field of gas purification device technology, specifically to a plasma-based air filtration device. Background Technology

[0002] A plasma indoor air purification device, disclosed in the prior art with the publication number "CN112197393A", includes a ventilated housing. The inner wall of the housing is sequentially connected from the air inlet to the air outlet, comprising a compressor fan, a particle filter module, a plasma generation module, a catalytic reaction module, and an ozone removal module. The plasma generation module is sequentially connected to a control module and a power supply module. This device effectively removes formaldehyde from the air flowing through the purifier's duct, overcoming the performance degradation and low formaldehyde removal efficiency of traditional negative ion air purifiers and filter-type air purifiers after prolonged use. The mechanism by which this device uses plasma technology to treat formaldehyde gas involves direct collisions between electrons and formaldehyde molecules, causing their decomposition, and a chemical oxidation reaction between the active groups generated in the electric field and the formaldehyde molecules. The resulting products are harmless and can be directly emitted without causing secondary pollution.

[0003] However, the aforementioned device still has some obvious drawbacks in its use: although the device purifies the air through a three-dimensional generator, its function is relatively simple. Existing air purification devices also include activated carbon adsorption modules, but these modules need to be replaced regularly to achieve good air purification results. However, frequent replacements lead to the unused and discarded activated carbon adsorption modules, thus increasing the cost of air purification. The common activated carbon washing method in daily life is simply to expose the activated carbon adsorption module to sunlight to wash away the harmful substances adsorbed inside, allowing it to be recycled multiple times. This washing method is greatly affected by environmental factors and cannot decompose the harmful substances adsorbed inside the activated carbon, thus limiting the washing effect. Summary of the Invention

[0004] The purpose of this invention is to provide a plasma-based air filtration device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A plasma-based air filtration device includes a multi-stage filter layer housing, and a filter fan is fixedly installed on one side of the multi-stage filter layer housing.

[0007] The multi-stage filter layer shell is independently and detachably equipped with a catalytic filter layer, an activated carbon particle filter layer, a HEPA filter layer, and a flexible plasma filter layer. The catalytic filter layer, activated carbon particle filter layer, HEPA filter layer, and flexible plasma filter layer are arranged from far to near the filter fan to form a multi-layer synergistic filtration system.

[0008] The activated carbon particle filter layer and the flexible plasma filter layer are connected by an activated carbon particle circulation device provided on the multi-stage filter layer shell, so that the activated carbon particles can circulate between the activated carbon particle filter layer and the flexible plasma filter layer.

[0009] When activated carbon particles are located in the activated carbon particle filter layer, the gas passing through the activated carbon particle filter layer is filtered and purified by the activated carbon particles.

[0010] When activated carbon particles are located in a flexible plasma filter layer, the plasma generated by the flexible plasma filter layer causes the harmful substances adsorbed in the activated carbon particles to be decomposed and washed away, thereby enabling the activated carbon particles to be recycled.

[0011] Preferably, the multi-stage filter layer housing is provided with mounting slots for the installation and embedding of the catalytic filter layer, activated carbon particle filter layer, HEPA filter layer and flexible plasma filter layer.

[0012] Preferably, an auxiliary disassembly handle is installed on one side of each of the catalytic filter layer, activated carbon particle filter layer, HEPA filter layer, and flexible plasma filter layer.

[0013] Preferably, the flexible plasma filter layer consists of a first fixed frame and flexible plasma filter plates installed on both sides of the first fixed frame. The flexible plasma filter plates on both sides are separated to form an elution interlayer. The upper and lower sides of the first fixed frame are respectively provided with an elution inlet and an elution outlet communicating with the elution interlayer. An electrical contact is also installed at one end of the first fixed frame. The electrical contact is movably engaged with a contact point provided inside the assembly slot. When the flexible plasma filter layer is installed on the multi-stage filter layer shell, the electrical contact abuts against the contact point to supply power to the flexible plasma filter layer.

[0014] Preferably, the activated carbon particle filter layer consists of a second fixed frame and activated carbon barrier nets installed on both sides of the second fixed frame. The activated carbon barrier nets on both sides are separated to form a purification interlayer. The upper and lower sides of the second fixed frame are respectively provided with a purification inlet and a purification outlet communicating with the purification interlayer.

[0015] Preferably, the activated carbon particle circulation device is provided in two sets. The activated carbon particle circulation device includes a lifting device, a feed pipe, and a discharge slide pipe. The feed pipe and the discharge slide pipe are respectively connected to the inlet and outlet of the lifting device. The feed pipe and discharge slide pipe of one set of activated carbon particle circulation devices are connected to the purification outlet and the elution inlet, respectively. The feed pipe and discharge slide pipe of the other set of activated carbon particle circulation devices are connected to the elution outlet and the purification inlet, respectively. Thus, the activated carbon particles can circulate between the flexible plasma filter layer and the activated carbon particle filter layer by setting up two sets of activated carbon particle circulation devices.

[0016] Preferably, the lifting device is a screw conveyor or an airflow conveyor.

[0017] Preferably, both the activated carbon granule filter layer and the flexible plasma filter layer are equipped with inclined plates. The purification outlet and the elution outlet are located on one side of the bottom of the inclined plates. The bottom of both the first and second fixed frames are provided with telescopic channels. Each telescopic channel is equipped with a connecting telescopic plate. The connecting telescopic plate has a through hole that movably engages with the purification outlet or the elution outlet. A compression spring is also installed at one end of the connecting telescopic plate. The compression spring pushes the connecting telescopic plate to move without external force, causing the purification outlet or the elution outlet to be misaligned with the through hole. At this time, the purification outlet or the elution outlet is closed. When the activated carbon granule filter layer and the flexible plasma filter layer are installed on the multi-stage filter layer shell through the assembly slot, the assembly slot pushes the connecting telescopic plate to overcome the elastic force of the compression spring. At this time, the purification outlet or the elution outlet engages with the through hole, thereby opening the purification outlet or the elution outlet.

[0018] Preferably, a falling slide is provided on the multi-stage filter layer shell below the purification outlet or elution outlet, and the end of the falling slide away from the purification outlet or elution outlet is connected to the feed pipe of the activated carbon particle circulation device.

[0019] Preferably, the gas inlet and gas outlet directions of the multi-stage filter layer housing can be detachably equipped with a blocking grille, and the top of the multi-stage filter layer housing can be detachably equipped with a protective cover.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] This invention effectively adsorbs and filters harmful substances in the gas through the synergistic effect of multiple air purification modules, ensuring that the purified gas is fresh and healthy.

[0022] The flexible plasma filter layer of this invention has multiple functions. On the one hand, it serves as a decomposition device for harmful substances in the gas. On the other hand, it can wash and purify the activated carbon particles in the activated carbon particle filter layer, enabling it to be recycled multiple times, thereby reducing the cost of air purification. In addition, this washing method has a better washing effect than the commonly used light washing method in daily life. Attached Figure Description

[0023] Figure 1 This is a schematic diagram showing the overall structure of the present invention after disassembly.

[0024] Figure 2 This is a partial cross-sectional view of the present invention;

[0025] Figure 3 This is a schematic diagram of the disassembly structure of the connecting telescopic plate of the present invention;

[0026] Figure 4 This is a cross-sectional view of the activated carbon particle filter layer and the flexible plasma filter layer of the present invention.

[0027] Figure 5 This is a cross-sectional view of the location of the drop slide of the present invention;

[0028] Figure 6 This is a cross-sectional schematic diagram of the flexible plasma filter layer of the present invention;

[0029] Figure 7 This is a cross-sectional schematic diagram of the activated carbon granule filter layer of the present invention;

[0030] Figure 8 This is a schematic diagram of the overall structure of the present invention.

[0031] In the diagram: 1. Multi-stage filter layer shell, 2. Filter fan, 3. Catalytic filter layer, 4. Activated carbon granular filter layer, 5. HEPA filter layer, 6. Flexible plasma filter layer, 7. Assembly slot, 8. Auxiliary disassembly handle, 9. First fixed frame, 10. Flexible plasma filter screen, 11. Elution jacket, 12. Elution inlet, 13. Elution outlet, 14. Electrical contact, 15. Second fixed frame, 16. Activated carbon barrier, 17. Purification jacket, 18. Purification inlet, 19. Purification outlet, 20. Lifting device, 21. Feed pipe, 22. Discharge slide pipe, 23. Inclined plate, 24. Connecting telescopic plate, 25. Through hole, 26. Compression spring, 27. Falling slide, 28. Barrier grid, 29. Shell protective cover. Detailed Implementation

[0032] 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.

[0033] Please see Figure 1-8 The present invention provides a technical solution:

[0034] Example 1:

[0035] A plasma-based air filtration device comprises a multi-stage filter housing 1, a filter fan 2, and a catalytic filter layer 3, an activated carbon particulate filter layer 4, and a HEPA filter layer 5 sequentially installed inside the multi-stage filter housing 1. These components, arranged from far to near relative to the filter fan 2, form a multi-layered synergistic filtration system. Compared to a single filter module, this multi-layered synergistic filtration system effectively intercepts particulate pollutants, gaseous pollutants, viruses, and bacteria, ensuring clean and fresh output air. All four filter modules are independently detachable for easy replacement; therefore, auxiliary disassembly handles 8 are provided on the sides of each module, and mounting slots 7 are correspondingly provided in the multi-stage filter housing 1 for positioning and fixing.

[0036] In this multi-layer synergistic filtration system, the arrangement of the activated carbon particulate filter layer 4 and the flexible plasma filter layer 6 is a key structural feature that distinguishes it from the superimposed cleaning modules in existing technologies. The activated carbon particulate filter layer 4 and the flexible plasma filter layer 6 are arranged alternately, separated by a HEPA filter layer 5. The HEPA filter layer 5 mainly intercepts tiny particulate pollutants in the air, thereby ensuring that the flexible plasma filter layer 6 can work for a long time and reducing the risk of particulate pollutant clogging. This specific combination sequence protects the more valuable flexible plasma filter layer 6. In addition, the activated carbon particles can circulate within the activated carbon particulate filter layer 4 and the flexible plasma filter layer 6, allowing the activated carbon to be eluted after adsorbing impurities, thus extending the service life of the activated carbon and reducing the user's operating costs. The plasma elution of activated carbon is based on the highly active substances generated in the non-equilibrium plasma, such as hydroxyl radicals and oxygen atoms, which oxidize and decompose the organic pollutant molecules adsorbed in the micropores of the activated carbon, converting them into small molecules such as CO2 and H2O and desorbing them, thereby partially restoring the adsorption capacity of the activated carbon.

[0037] The principle of this process is the advanced oxidation principle in plasma chemistry, namely, the strong oxidizing species produced by the cracking of gas molecules by high-energy electrons can degrade organic matter. Experiments using plasma for activated carbon elution have been widely seen in academic research. For example, in laboratory dielectric barrier discharge or pulsed corona reactors, plasma treatment of activated carbon saturated with specific VOCs such as toluene and formaldehyde can significantly restore its adsorption capacity. The flexible plasma filter layer 6 is connected to a step-up transformer module on the multi-stage filter layer shell 1 via an electrical contact 14, thereby generating a 3.2kV ​​high voltage from a low-voltage DC power supply through the step-up transformer module, driving the flexible plasma filter layer to ionize air. The system generates active substances such as hydroxyl radicals to decompose harmful substances. The flexible plasma filter layer 6 incorporates a current-limiting protection circuit to ensure system safety during power fluctuations, with maximum power consumption controlled below 20W. Then, composite pollutants are introduced. The main body of the device is made of high-barrier acrylic material. The polluted gas is purified on the flexible plasma filter plate 10, operating stably under a 3.2kV ​​high voltage. Uniformly distributed micro-discharges are generated on the flexible plasma filter plate 10, forming atmospheric pressure non-equilibrium plasma. The plasma power density is controlled within the range of 0.4-1.0W / cm², and the discharge intensity can be adjusted according to the pollutant concentration to optimize energy efficiency. This technology has broad application prospects in home environments, medical environments, and special experimental environments, and therefore will not be elaborated further.

[0038] To achieve the circulating flow of activated carbon particles between the activated carbon particle filter layer 4 and the flexible plasma filter layer 6, the flexible plasma filter layer 6 consists of a first fixed frame 9 and flexible plasma filter plates 10 installed on both sides of the first fixed frame 9. The flexible plasma filter plates 10 on both sides are separated to form an elution interlayer 11. The first fixed frame 9 has elution inlets 12 and elution outlets 13 on its upper and lower sides, respectively, which communicate with the elution interlayer 11. An electrical contact 14 is also installed at one end of the first fixed frame 9. The electrical contact 14 is assembled with... The contacts inside the slot 7 are movable and cooperate. When the flexible plasma filter layer 6 is installed on the multi-stage filter layer shell 1, the electrical contact 14 abuts against the contacts to supply power to the flexible plasma filter layer 6. The activated carbon particle filter layer 4 is composed of a second fixed frame 15 and activated carbon barrier nets 16 installed on both sides of the second fixed frame 15. The activated carbon barrier nets 16 on both sides are separated to form a purification interlayer 17. The upper and lower sides of the second fixed frame 15 are respectively provided with a purification inlet 18 and a purification outlet 19 that communicate with the purification interlayer 17.

[0039] The above configuration allows activated carbon particles to be discharged through the purification outlet 19 located below the activated carbon particle filter layer 4, and then enter the elution jacket 11 through the elution inlet 12 via the activated carbon particle circulation device for elution. Similarly, after elution, the activated carbon particles are discharged through the elution outlet 13, and then enter the purification jacket 17 through the purification inlet 18 via the activated carbon particle circulation device. To ensure the closed state of the activated carbon particle filter layer 4 and the flexible plasma filter layer 6 before installation, both the first fixed frame 9 and the second fixed frame 15 have telescopic channels at their bottoms. Each telescopic channel has a telescopically installed connecting telescopic plate 24. The connecting telescopic plate 24 has a through hole 25 that movably cooperates with the purification outlet 19 or the elution outlet 13. One end of the connecting telescopic plate 24 is also equipped with an extrusion device. The compression spring 26 pushes the connecting telescopic plate 24 to move without external force, causing the purification outlet 19 or the elution outlet 13 to be misaligned with the through hole 25. At this time, the purification outlet 19 or the elution outlet 13 is closed. When the activated carbon particle filter layer 4 and the flexible plasma filter layer 6 are installed on the multi-stage filter layer shell 1 through the assembly slot 7, the assembly slot 7 pushes the connecting telescopic plate 24 to overcome the elastic force of the compression spring 26. At this time, the purification outlet 19 or the elution outlet 13 cooperates with the through hole 25, thereby opening the purification outlet 19 or the elution outlet 13. The gas inlet and gas outlet directions of the multi-stage filter layer shell 1 can also be detachably installed with a blocking grille 28. The shell protective cover 29 can also be detachably installed on the top of the multi-stage filter layer shell 1, thereby protecting the entire device.

[0040] Example 2:

[0041] A falling slide 27 is provided on the multi-stage filter layer shell 1 below the purification outlet 19 or the washing outlet 13. The end of the falling slide 27 away from the purification outlet 19 or the washing outlet 13 is connected to the feed pipe 21 of the activated carbon particle circulation device.

[0042] The activated carbon granule circulation device is configured in two sets. The activated carbon granule circulation device includes a lifting device 20, a feed pipe 21, and a discharge slide pipe 22. The feed pipe 21 and the discharge slide pipe 22 are respectively connected to the inlet and outlet of the lifting device 20. The feed pipe 21 and the discharge slide pipe 22 of one set of activated carbon granule circulation devices are connected to the purification outlet 19 and the washing inlet 12, respectively. The feed pipe 21 and the discharge slide pipe 22 of the other set of activated carbon granule circulation devices are connected to the washing outlet 13 and the purification inlet 18, respectively. Thus, the activated carbon granules are circulated between the flexible plasma filter layer 6 and the activated carbon granule filter layer 4 through the configuration of the two sets of activated carbon granule circulation devices. The lifting device 20 is a screw conveyor.

[0043] In this embodiment, the specific structure of the activated carbon particle circulation device is further disclosed. A falling slide 27 is provided below the multi-stage filter layer shell 1, which is connected to the purification outlet 19 or the elution outlet 13. The activated carbon particles can slide down through the falling slide 27 to one end of the feed pipe 21 under the action of gravity. A spiral lifting impeller of the lifting device 20 is provided at one end of the feed pipe 21. The rotation of the spiral lifting impeller causes the activated carbon particles to rise and reach the upper feed slide 22. The activated carbon particles slide down again in the feed slide 22 due to the principle of gravity and enter the elution jacket 11 or the purification jacket 17.

[0044] Example 3:

[0045] This embodiment describes the working status and collaborative process of each component of the air purification device during daily operation, when adsorption purification is the core task. At this time, the activated carbon particles mainly work within the activated carbon particle filter layer 4, performing the adsorption function.

[0046] System startup: The user powers on the device, and the filter fan 2 starts operating, drawing indoor air into the device. The air first passes through the removable barrier grille 28, initially intercepting large particles of hair and dust.

[0047] Multiple filtration process: Driven by the filter fan 2, air flows sequentially through multiple filter layers arranged from far to near:

[0048] First stage: Catalytic filter layer 3. Air first passes through this layer and undergoes a preliminary catalytic oxidation reaction, decomposing some organic gases at room temperature and reducing the load on subsequent filtration.

[0049] Second stage: Activated carbon particle filter layer 4. Air enters the purification interlayer 17, which is surrounded by the second fixed frame 15 and the activated carbon barrier nets 16 on both sides. The interlayer is filled with activated carbon particles. When the air passes through the gaps between the particles, the gaseous pollutants such as formaldehyde, benzene series compounds, and odors are efficiently adsorbed by the activated carbon.

[0050] The third stage: HEPA filter layer 5. After the air has been adsorbed and purified, it passes through this layer, and the solid particles such as PM2.5, pollen and dust remaining in the air are completely intercepted.

[0051] Fourth stage: Flexible plasma filter layer 6. Air finally passes through the channel formed by the first fixed frame 9 and the flexible plasma filter plate 10. At this time, the electrical contact 14 has been connected to the power supply, and plasma continues to be generated to perform final sterilization of the air and degrade a small amount of gaseous pollutants that have penetrated the previous stage.

[0052] Example 4:

[0053] This embodiment describes the manual switching of the device to the elution and regeneration mode when the activated carbon adsorption is saturated or regeneration is required according to the programmed settings. This process requires moving the entire device outdoors to prevent harmful substances generated during the elution process from re-entering the clean space. At this time, the core task is to transfer the saturated particles in the activated carbon granular filter layer to the flexible plasma filter layer for regeneration, and then send the regenerated particles back.

[0054] Mode switching and particle release: The user actively selects to trigger the elution program. Initially, filter fan 2 may reduce its speed or remain running. The key action occurs at the bottom of the two filter layers:

[0055] Inside the activated carbon granular filter layer 4, due to the design of the inclined plate 23, the saturated activated carbon granules naturally collect near the lower purification outlet 19.

[0056] Saturated activated carbon particles immediately pass through purification outlet 19 and fall into the drop chute 27 below it.

[0057] The particles falling into the cascading slide 27 slide down into the feed pipe 21 of the activated carbon particle circulation device connected thereto under the action of gravity. The lifting device 20 of the circulation device is activated to lift the particles upward and transport them to the elution inlet 12 at the top of the flexible plasma filter layer 6 through the discharge slide 22.

[0058] Saturated activated carbon particles enter the elution interlayer 11 of the flexible plasma filter layer 6. Simultaneously, the electrical contacts 14 of this layer are powered, and the flexible plasma filter plate 10 generates a high concentration of low-temperature plasma, which diffuses throughout the elution interlayer 11. The high-energy electrons, free radicals, and other active substances in the plasma bombard and decompose the organic pollutant molecules adsorbed in the micropores of the activated carbon, converting them into harmless substances such as carbon dioxide and water, thereby achieving in-situ elution and regeneration of the activated carbon.

[0059] Inside the elution jacket, the regenerated activated carbon particles also slide down the inclined plate 23 to the elution outlet 13 at the bottom. The regenerated particles fall into another set of activated carbon particle circulation devices through the drop slide 27, are lifted and transported back to the purification inlet 18 at the top of the activated carbon particle filter layer 4, and are refilled into the purification jacket 17 to prepare for a new round of adsorption filtration.

[0060] 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 plasma-based air filtration device, comprising a multi-stage filter layer housing, wherein a filter fan is fixedly mounted on one side of the multi-stage filter layer housing, characterized in that: The multi-stage filter layer shell is independently and detachably equipped with a catalytic filter layer, an activated carbon particle filter layer, a HEPA filter layer, and a flexible plasma filter layer. The catalytic filter layer, activated carbon particle filter layer, HEPA filter layer, and flexible plasma filter layer are arranged from far to near the filter fan to form a multi-layer synergistic filtration system. The activated carbon particle filter layer and the flexible plasma filter layer are connected by an activated carbon particle circulation device provided on the multi-stage filter layer shell, so that the activated carbon particles can circulate between the activated carbon particle filter layer and the flexible plasma filter layer. When activated carbon particles are located in the activated carbon particle filter layer, the gas passing through the activated carbon particle filter layer is filtered and purified by the activated carbon particles. When activated carbon particles are located in a flexible plasma filter layer, the plasma generated by the flexible plasma filter layer causes the harmful substances adsorbed in the activated carbon particles to be decomposed and washed away, thereby enabling the activated carbon particles to be recycled. The flexible plasma filter layer consists of a first fixed frame and flexible plasma filter plates installed on both sides of the first fixed frame. The flexible plasma filter plates on both sides are separated to form an elution interlayer. The upper and lower sides of the first fixed frame are respectively provided with an elution inlet and an elution outlet communicating with the elution interlayer. An electrical contact is also installed at one end of the first fixed frame. The electrical contact is in movable cooperation with the contact point provided inside the assembly slot. When the flexible plasma filter layer is installed on the multi-stage filter layer shell, the electrical contact abuts against the contact point to supply power to the flexible plasma filter layer.

2. The plasma-based air filtration device according to claim 1, characterized in that: The multi-stage filter layer housing has corresponding assembly slots for mounting and embedding the catalytic filter layer, activated carbon particle filter layer, HEPA filter layer, and flexible plasma filter layer.

3. The plasma-based air filtration device according to claim 2, characterized in that: Each of the catalytic filter layer, activated carbon particle filter layer, HEPA filter layer, and flexible plasma filter layer is equipped with an auxiliary disassembly handle on one side.

4. The plasma-based air filtration device according to claim 3, characterized in that: The activated carbon granule filter layer consists of a second fixed frame and activated carbon barrier nets installed on both sides of the second fixed frame. The activated carbon barrier nets on both sides are separated to form a purification interlayer. The upper and lower sides of the second fixed frame are respectively provided with a purification inlet and a purification outlet that communicate with the purification interlayer.

5. The plasma-based air filtration device according to claim 4, characterized in that: The activated carbon granule circulation device is provided in two sets. The activated carbon granule circulation device includes a lifting device, a feed pipe and a discharge slide pipe. The feed pipe and the discharge slide pipe are respectively connected to the inlet and outlet of the lifting device. The feed pipe and discharge slide pipe of one set of activated carbon granule circulation devices are connected to the purification outlet and the elution inlet, respectively. The feed pipe and discharge slide pipe of the other set of activated carbon granule circulation devices are connected to the corresponding elution outlet and the purification inlet. Thus, the activated carbon granules are circulated between the flexible plasma filter layer and the activated carbon granule filter layer through the arrangement of the two sets of activated carbon granule circulation devices.

6. The plasma-based air filtration device according to claim 5, characterized in that: The lifting device is a screw conveyor or an airflow conveyor.

7. The plasma-based air filtration device according to claim 6, characterized in that: Both the activated carbon granule filter layer and the flexible plasma filter layer are equipped with inclined plates. The purification outlet and the elution outlet are located on one side of the bottom of the inclined plates. The bottom of both the first and second fixed frames are provided with telescopic channels. Each telescopic channel is equipped with a connecting telescopic plate. The connecting telescopic plate has a through hole that movably engages with the purification outlet or the elution outlet. A compression spring is also installed at one end of the connecting telescopic plate. The compression spring pushes the connecting telescopic plate to move without external force, causing the purification outlet or the elution outlet to misalign with the through hole. At this time, the purification outlet or the elution outlet is closed. When the activated carbon granule filter layer and the flexible plasma filter layer are installed on the multi-stage filter layer shell through the assembly slot, the assembly slot pushes the connecting telescopic plate to overcome the elastic force of the compression spring. At this time, the purification outlet or the elution outlet engages with the through hole, thereby opening the purification outlet or the elution outlet.

8. The plasma-based air filtration device according to claim 7, characterized in that: A drop slide is correspondingly provided on the multi-stage filter layer shell below the purification outlet or elution outlet, and the end of the drop slide away from the purification outlet or elution outlet is connected to the feed pipe of the activated carbon particle circulation device.

9. A plasma-based air filtration device according to claim 8, characterized in that: The gas inlet and gas outlet directions of the multi-stage filter layer shell can be detachably equipped with blocking grilles, and a protective cover can be detachably installed on the top of the multi-stage filter layer shell.

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