A combined brush electrode ion plasma disinfection and purification module

Abstract

This invention discloses a combined brush electrode ion plasma disinfection and purification module, relating to the field of air disinfection and purification technology. It includes a mounting housing with a bottom cover attached to its lower part. Mounting cover plates are mounted on both sides of the upper end of the mounting housing, and an integrated ion plasma generator is fixedly installed between the two mounting cover plates. The ion plasma generator comprises five layers of main structure arranged sequentially along its thickness direction, and discharge units integrated at both ends of the length direction of the five layers of main structure. Through the deep physical and electrical integration of the brush electrode and the five-layer DBD main structure, deep synergy between corona discharge and dielectric barrier discharge is achieved: the corona discharge stably generated by the brush tip releases a large number of "seed electrons," significantly reducing the air breakdown threshold of the main DBD discharge, accelerating the chain avalanche ionization process, and enabling a significant increase in ion plasma concentration and generation rate at a lower driving voltage.

Description

Technical Field

[0001] This invention relates to the field of air disinfection and purification technology, specifically to a combined brush electrode ion paste disinfection and purification module. Background Technology

[0002] As the public's requirements for indoor air quality continue to increase, plasma (ion plasma) air disinfection and purification technology has been widely used in home, medical, automotive, and commercial office scenarios due to its advantages such as no need for consumables, high sterilization efficiency, no secondary pollution, and the ability for humans and machines to coexist.

[0003] Currently, the mainstream ion plasma disinfection and purification modules on the market are mainly divided into two categories: one is a single dielectric barrier discharge (DBD) structure, which requires an extremely high driving voltage to achieve air breakdown, resulting in high energy consumption. Furthermore, the generated plasma is prone to recombination and annihilation in the electrode gap, resulting in a small effective diffusion range and limited purification efficiency. It is also prone to ozone exceeding the standard. The other is a single corona discharge structure, which produces a low concentration of ion plasma, resulting in poor sterilization and deodorization effects. In addition, the metal discharge tip is prone to oxidation and ablation, and tip passivation, leading to a short service life and severe performance degradation with long-term use. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a combined brush electrode ion plasma disinfection and purification module. Through the deep physical and electrical integration of the brush electrode with the five-layer DBD main structure, a deep synergy between corona discharge and dielectric barrier discharge is achieved: the corona discharge stably generated by the brush tip releases a large number of "seed electrons," significantly reducing the air breakdown threshold of the main DBD discharge, accelerating the chain avalanche ionization process, and enabling a significant leap in ion plasma concentration and generation rate at a lower driving voltage, thereby greatly reducing module energy consumption and improving purification efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a combined brush electrode ion plasma disinfection and purification module, comprising a mounting housing, a mounting bottom cover being attached to the lower part of the mounting housing, and mounting cover plates being attached to both sides of the upper end of the mounting housing. An integrated ion plasma generator is fixedly installed between the two mounting cover plates. The ion plasma generator comprises a five-layer main structure arranged in a fixed stack along its thickness direction, and discharge units integrated at both ends of the length direction of the five-layer main structure. The five-layer main structure, from top to bottom, comprises: a metal sheet layer A serving as a first low-voltage electrode, a first glass layer serving as a first dielectric barrier layer, a high-voltage sheet layer serving as a high-voltage electrode, a second glass layer serving as a second dielectric barrier layer, and a metal sheet layer serving as a second low-voltage electrode. B; The high-voltage sheet is a stainless steel sheet with periodic microstructures on its surface, the periodic microstructures being an array of regular small hexagonal honeycomb holes; Metal sheet A and metal sheet B are stainless steel sheets with periodic microstructures on their surfaces, the periodic microstructures being an array of regular hexagonal honeycomb holes; the regular small hexagonal honeycomb holes and the regular hexagonal honeycomb holes have a 60%-80% overlap area on the stacked projection plane to form a pre-set distributed discharge channel; The discharge unit includes brush electrodes respectively fixedly disposed at both ends of the length direction of the ion plasma generator; the bristles of the brush electrodes are made of conductive ceramic fiber material, the conductive substrate of the brush electrodes is electrically connected to the metal sheet A and metal sheet B respectively, and the brush electrodes are provided with independent power supply circuits.

[0006] Preferably, the thickness of the high-voltage sheet is no greater than 0.15 mm, the thickness of the metal sheet A and the metal sheet B is no greater than 0.2 mm, and the thickness of the first glass layer and the second glass layer is no greater than 1.3 mm.

[0007] Preferably, the first glass layer and the second glass layer are both high borosilicate glass sheets, and the five-layer main structure is integrally fixed by a high-temperature sintering process.

[0008] Preferably, the conductive substrate of the brush electrode is a copper substrate, and the conductive ceramic fiber bristles are doped with rare earth oxides, with a single fiber diameter of 0.08-0.12 mm.

[0009] A method for generating ion plasma using a combined brush electrode ion plasma disinfection and purification module includes the following steps:

[0010] S1. Pre-ionization and electric field establishment: A nanosecond pulsed AC voltage with a frequency of 20kHz-50kHz and a peak voltage of 8kV-15kV is applied to the high-voltage sheet. At the same time, a reverse bias voltage with an amplitude of 1kV-2kV and opposite phase to the high-voltage sheet is applied to the metal sheet A and metal sheet B, forming a strong alternating electric field inside the five-layer main structure. A 3kV DC superimposed pulse voltage is applied to the brush electrode to form a local strong electric field at the tip of the brush bristles.

[0011] S2. Synergistic discharge excitation: Under the action of the electric field established in step S1, the distributed discharge channel formed by the overlapping area of ​​the periodic microstructure within the five-layer main structure generates nanosecond pulse dielectric barrier discharge, generating initial plasma; at the same time, the brush tip of the brush electrode generates stable corona discharge under a local strong electric field, releasing seed electrons.

[0012] S3. Ion plasma composite and reinforcement: Seed electrons released by the corona discharge at the tip of the brush electrode are absorbed into the strong electric field region on the outer surface of the five-layer main structure and collide with the initial plasma generated by the nanosecond pulse dielectric barrier discharge, triggering a chain avalanche ionization reaction; by controlling the amplitude and phase of the reverse bias voltage, the ratio of positive and negative oxygen ions in the stable ion plasma formed after avalanche ionization is controlled between 1:1 and 1:3.

[0013] S4. Ion plasma guidance and injection: Under the combined action of the alternating electric field and the space charge disturbance caused by the brush electrodes, the ion plasma is accelerated and drawn out from the brush electrode areas at both ends and the sides of the five-layer main structure along the length of the module, forming a uniformly diffused ion plasma cloud, thus completing the air disinfection and purification.

[0014] Preferably, in step S2, the pulse width of the nanosecond pulse dielectric barrier discharge is 50-200 nanoseconds.

[0015] Compared with existing technologies, this invention provides a combined brush electrode ion plasma disinfection and purification module with the following advantages: Through the deep physical and electrical integration of the brush electrode and the five-layer DBD main structure, deep synergy between corona discharge and dielectric barrier discharge is achieved: The corona discharge stably generated by the brush tip releases a large number of "seed electrons", which significantly reduces the air breakdown threshold of the main DBD discharge, accelerates the chain avalanche ionization process, and can achieve a leap in ion plasma concentration and generation rate at a lower driving voltage, greatly reducing module energy consumption and improving purification efficiency.

[0016] Through the matching design of the honeycomb array of high and low voltage electrodes, a 60%-80% projection overlap rate forms a uniform and dense distributed discharge channel, which significantly enhances the electric field concentration effect, avoids local arcing and uneven discharge, and greatly improves discharge stability. At the same time, through independent reverse bias voltage regulation, the electric field distribution and electron energy can be precisely controlled, and the ratio of positive and negative oxygen ions can be stably controlled between 1:1 and 1:3. While ensuring efficient sterilization and deodorization, the ozone concentration is strictly controlled to meet national standards to avoid ozone exceeding the limit.

[0017] Using conductive ceramic fibers doped with rare earth oxides as the bristles of the brush electrode, compared with traditional metal bristles, it has excellent conductivity, high temperature resistance and oxidation resistance. It is not prone to tip ablation and passivation problems after long-term use, and can increase the continuous working life of the module by more than 2 times, solving the pain points of short life and rapid performance decay of traditional corona discharge structures.

[0018] By leveraging the synergistic guiding effect of the space charge perturbation of the brush electrodes and the alternating electric field of the five-layer main structure, the generated ion plasma can be uniformly accelerated and diffused, significantly reducing the recombination and annihilation rate of the plasma in the electrode gap, expanding the effective purification coverage, and ultimately achieving a high-efficiency purification effect with a sterilization rate of ≥99% for Staphylococcus aureus, a formaldehyde removal rate of ≥97%, and an ammonia removal rate of ≥97%, which can be widely adapted to various air disinfection and purification scenarios. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the disassembly structure of the mounting cover plate of the present invention;

[0021] Figure 3 This is a schematic diagram of the disassembled structure of the present invention;

[0022] Figure 4 This is a partial structural diagram of the present invention;

[0023] Figure 5 This is a schematic diagram of the disassembled structure of the ion plasma generator of the present invention.

[0024] In the diagram: 1. Mounting housing; 11. Mounting bottom cover; 2. Ion plasma generator; 21. Metal sheet layer A; 22. First glass layer; 23. High voltage sheet layer; 24. Second glass layer; 25. Metal sheet layer B; 3. Mounting cover plate; 31. Brush electrode. Detailed Implementation

[0025] In this invention, unless otherwise stated, the directional terms such as "up" and "down" generally refer to the directions shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" generally refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0026] The raw materials used in this embodiment are all commercially available products: the stainless steel sheet is 304 food-grade stainless steel; the conductive ceramic fiber is alumina-based conductive ceramic fiber doped with lanthanide rare earth oxides; the glass sheet is high borosilicate glass; the mounting base, mounting bottom cover, and mounting cover plate are all made of flame-retardant ABS material; and the conductive substrate of the brush electrode is made of oxygen-free copper.

[0027] The testing environment and standards in this embodiment all adopt the currently valid national standards:

[0028] Test environment: 30m³ sealed test chamber, temperature 25℃±2℃, relative humidity 50%±5%, test time 60min;

[0029] Staphylococcus aureus sterilization rate test: Refer to GB 28235-2020 "Hygienic Requirements for Air Sterilizers";

[0030] Formaldehyde and ammonia removal rate test: Refer to GB / T 18801-2022 "Air Purifiers";

[0031] Ozone concentration test: Refer to GB / T 18883-2022 "Indoor Air Quality Standard", the limit is ≤0.16mg / m³.

[0032] Please see Figures 1-5 This invention provides a technical solution for a combined brush electrode ion plasma disinfection and purification module:

[0033] Example 1, the specific preparation steps are as follows:

[0034] The five-layer main structure of the ion plasma generator is prepared as follows:

[0035] A 304 stainless steel sheet with a thickness of 0.12 mm was selected as the high-pressure layer 23, and a regular small hexagonal honeycomb hole array was processed on its surface using laser etching technology, wherein the hole side length is 0.6 mm and the hole spacing is 0.2 mm.

[0036] 304 stainless steel sheets with a thickness of 0.15mm were selected as metal sheet layer A21 and metal sheet layer B25. A regular hexagonal honeycomb hole array was processed on its surface using laser etching process, wherein the hole side length is 0.9mm and the hole spacing is 0.2mm.

[0037] A 1.0 mm thick high borosilicate glass sheet is selected as the first glass layer 22 and the second glass layer 24. The surface of the glass sheet is subjected to plasma cleaning treatment to improve the interlayer bonding force.

[0038] Metal sheet A21, first glass layer 22, high-pressure sheet 23, second glass layer 24, and metal sheet B25 are precisely aligned and stacked from top to bottom to ensure that the overlap rate of small hexagonal honeycomb cells and regular hexagonal honeycomb cells on the stacked projection surface is 70%. A high-temperature sintering process is used with a sintering temperature of 500℃ and a holding time of 2 hours to fix and form a five-layer main structure.

[0039] Assemble the brush discharge unit: Select conductive ceramic fibers doped with rare earth oxides as brush bristles, with a single fiber diameter of 0.1 mm. The brush bristles are uniformly fixed on the oxygen-free copper conductive substrate to form brush electrodes 31. Fix two sets of brush electrodes 31 at both ends of the length direction of the five-layer main structure. Reliably connect the conductive substrate of the brush electrodes 31 to the metal sheet A21 and the metal sheet B25 respectively through conductive bolts. At the same time, provide an independent power supply circuit for the brush electrodes 31 to complete the preparation of the integrated ion plasma generator 2.

[0040] Overall module assembly: The prepared ion plasma generator 2 is fixedly installed in the inner cavity of the mounting housing 1 with bolts. Mounting cover plates 3 are attached to both sides of the upper end of the mounting housing 1 to limit and fix the ion plasma generator 2. The mounting bottom cover 11 is attached to the lower part of the mounting housing 1 to complete the overall module assembly.

[0041] The parameters for the ion plasma generation method in this embodiment are set as follows:

[0042] S1. Apply a nanosecond pulse AC voltage with a frequency of 35kHz and a peak voltage of 11kV to the high voltage sheet 23, apply a reverse bias voltage with an amplitude of 1.5kV that is opposite to the phase of the high voltage sheet 23 to the metal sheet A21 and the metal sheet B25, and apply a 3kV DC superimposed pulse voltage to the brush electrode 31.

[0043] S2. The pulse width of the nanosecond pulse dielectric barrier discharge is controlled to be 120 nanoseconds, and the tip of the brush electrode 31 generates a stable continuous DC superimposed pulse form of corona discharge.

[0044] S3. By adjusting the amplitude and phase of the reverse bias voltage, the ratio of positive to negative oxygen ions in the ion plasma is stably controlled at 1:2.

[0045] S4. Under the combined effect of the alternating electric field and the space charge disturbance of the brush electrodes, the ion plasma is accelerated out from the brush electrode areas at both ends and the sides of the five-layer main structure, forming a uniformly diffused ion plasma cloud.

[0046] Example 2, Preparation of the five-layer main structure:

[0047] High-voltage sheet: 0.12mm thick 304 stainless steel sheet, laser-etched small hexagonal honeycomb hole array, hole side length 0.6mm, hole spacing 0.2mm;

[0048] Low-voltage electrode metal sheet A / B: 0.15mm thick 304 stainless steel sheet, laser-etched hexagonal honeycomb hole array, hole side length 0.9mm, hole spacing 0.2mm;

[0049] Dielectric barrier layer: 1.0mm thick high borosilicate glass sheet;

[0050] Layered sintering: Layered in the above order, with a honeycomb cell projection overlap rate of 70%, sintered at 500℃ for 2 hours to form a single piece.

[0051] Brush electrode assembly: Same as in Example 1.

[0052] Overall module assembly: Same as in Example 1.

[0053] Parameters for ion plasma generation method:

[0054] High-voltage layer: 35kHz, 11kV nanosecond pulse AC voltage;

[0055] Low-voltage electrode: 1.5kV reverse bias voltage;

[0056] Brush electrodes: 3kV DC superimposed pulse voltage;

[0057] Nanosecond pulse dielectric barrier discharge pulse width: 120ns;

[0058] Target positive to negative oxygen ion ratio: 1:2;

[0059] Example 3, Preparation of the five-layer main structure:

[0060] High-voltage sheet: 0.10mm thick 304 stainless steel sheet, laser-etched small hexagonal honeycomb hole array, hole side length 0.7mm, hole spacing 0.2mm;

[0061] Low-voltage electrode metal sheet layer A / B: 0.10mm thick 304 stainless steel sheet, laser-etched hexagonal honeycomb hole array, hole side length 1.0mm, hole spacing 0.2mm;

[0062] Dielectric barrier layer: 0.8mm thick high borosilicate glass sheet;

[0063] Layered sintering: Layered in the above order, with an overlap rate of 80% for honeycomb cell projection, sintered at 500℃ for 2 hours to form a single piece.

[0064] Brush electrode assembly: Same as in Example 1.

[0065] Overall module assembly: Same as in Example 1.

[0066] Parameters for ion plasma generation method:

[0067] High-voltage layer: 50kHz, 15kV nanosecond pulse AC voltage;

[0068] Low-voltage electrode: 2kV reverse bias voltage;

[0069] Brush electrodes: 3kV DC superimposed pulse voltage;

[0070] Nanosecond pulse dielectric barrier discharge pulse width: 200ns;

[0071] Target ratio of positive to negative oxygen ions: 1:3;

[0072] Example 4, Preparation of the five-layer main structure:

[0073] High-voltage sheet: 0.13mm thick 304 stainless steel sheet, laser-etched small hexagonal honeycomb hole array, hole side length 0.65mm, hole spacing 0.2mm;

[0074] Low-voltage electrode metal sheet layer A / B: 0.18mm thick 304 stainless steel sheet, laser-etched hexagonal honeycomb hole array, hole side length 0.95mm, hole spacing 0.2mm;

[0075] Dielectric barrier layer: 1.1mm thick high borosilicate glass sheet;

[0076] Layered sintering: Layered in the above order, with a honeycomb cell projection overlap rate of 75%, sintered at 500℃ for 2 hours to form a single piece.

[0077] Brush electrode assembly: Same as in Example 1.

[0078] Overall module assembly: Same as in Example 1.

[0079] Parameters for ion plasma generation method:

[0080] High-voltage layer: 30kHz, 12kV nanosecond pulse AC voltage;

[0081] Low-voltage electrode: 1.8kV reverse bias voltage;

[0082] Brush electrodes: 3kV DC superimposed pulse voltage;

[0083] Nanosecond pulse dielectric barrier discharge pulse width: 150ns;

[0084] Target positive to negative oxygen ion ratio: 1:2.5.

[0085] Comparative Example 1: The brush electrode was removed, leaving only the five-layer DBD main structure. There was no corona discharge unit, and the rest was the same as in Example 2.

[0086] Comparative Example 2 retains the physical structure of the brush electrode, but the brush is not connected to electricity, does not apply a power supply voltage, and does not participate in the discharge. The rest is the same as in Example 2.

[0087] Comparative Example 3: The material of the brush electrode bristles was replaced with 304 stainless steel wire of the same diameter instead of conductive ceramic fiber; otherwise, it was the same as in Example 2.

[0088] Comparative Example 4: The overlap rate of the high and low voltage electrode honeycomb holes was adjusted from 70% to 50%, and the rest was the same as in Example 2.

[0089] Comparative Example 5: The thickness of the high-voltage sheet was adjusted from 0.12 mm to 0.2 mm, and the rest was the same as in Example 2.

[0090] Comparative Example 6: The low-voltage electrode metal sheets A / B are directly grounded, no reverse bias voltage is applied, and there is no ion ratio control. The rest is the same as in Example 2.

[0091] Comparative Example 7: The thickness of the dielectric barrier glass layer was adjusted from 1.0 mm to 1.5 mm, and the rest was the same as in Example 2.

[0092] Comparative Example 8: The pulse width of the nanosecond pulse dielectric barrier discharge was adjusted from 120ns to 300ns, and the rest was the same as in Example 2.

[0093] The ion plasma disinfection and purification modules obtained in Examples 1, 2, 3, 4 and Comparative Examples 1, 2, 3, 4, 5, 6, 7, 8 were subjected to performance tests. The specific test results are detailed in Tables 1 and 2.

[0094] Table 1

[0095]

[0096] Table 2

[0097]

[0098] Comparative Examples 1 and 2, with only the brush's discharge function removed and all other parameters identical, showed a decrease of over 20% in core sterilization and deodorization indicators, a doubling of driving voltage, and excessive ozone concentration. This demonstrates that the deep integration and synergy between the brush electrode and the DBD structure in this invention is the core of achieving low-voltage, high-efficiency purification. Comparative Example 3, with only the brush bristle material changed, initially performed similarly to Example 2, but its continuous working life was less than 40% of Example 2, proving that conductive ceramic fiber bristles are key to solving the problem of traditional metal tip ablation and extending module life.

[0099] Comparative Example 4, by simply reducing the overlap rate to outside the protection range, resulted in uneven discharge channel distribution, increased driving voltage, and a significant decrease in purification efficiency. This demonstrates that an overlap rate of 60%-80% is a necessary parameter for achieving uniform distributed discharge and improving purification efficiency. Comparative Examples 5 and 7, by simply adjusting the electrode / dielectric layer thickness to outside the protection range, resulted in a decrease in electric field strength, an increase in the breakdown threshold, a significant increase in driving voltage, and a decrease in purification efficiency. This proves that the thickness limitation of the present invention is a necessary condition for achieving low-voltage, high-efficiency discharge.

[0100] Comparative Example 6, by simply removing the reverse bias voltage, could not control the ratio of positive to negative oxygen ions, resulting in a significant increase in ozone concentration and a decrease in purification efficiency. This demonstrates that reverse bias voltage control is the core factor in controlling ozone and stabilizing the purification effect. Comparative Example 8, by simply adjusting the pulse width to outside the protection range, resulted in decreased discharge uniformity, increased plasma recombination rate, and a decrease in purification efficiency. This proves that a nanosecond pulse width of 50-200 ns is a necessary parameter for achieving efficient nanosecond pulse dielectric barrier discharge.

[0101] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A combined brush electrode ion plasma disinfection and purification module, comprising a mounting housing (1), wherein a mounting bottom cover (11) is attached to the lower part of the mounting housing (1), characterized in that: The upper ends of the mounting housing (1) are covered by mounting cover plates (3), and an integrated ion plasma generator (2) is fixedly installed between the two mounting cover plates (3). The ion plasma generator (2) includes a five-layer main structure that is fixedly stacked along its thickness direction, and discharge units integrated at both ends of the length direction of the five-layer main structure. The five-layer main structure, from top to bottom, consists of: a metal sheet A (21) serving as the first low-voltage electrode, a first glass layer (22) serving as the first dielectric barrier layer, a high-voltage sheet (23) serving as the high-voltage electrode, a second glass layer (24) serving as the second dielectric barrier layer, and a metal sheet B (25) serving as the second low-voltage electrode. The high-voltage sheet (23) is a stainless steel sheet with a periodic microstructure on its surface, and the periodic microstructure is a regular small hexagonal honeycomb hole array; the metal sheet A (21) and the metal sheet B (25) are stainless steel sheets with a periodic microstructure on their surface, and the periodic microstructure is a regular hexagonal honeycomb hole array; the regular small hexagonal honeycomb holes and the regular hexagonal honeycomb holes have a 60%-80% overlap area on the stacked projection surface to form a pre-set distributed discharge channel; The discharge unit includes brush electrodes (31) fixedly disposed at both ends of the length direction of the ion plasma generator (2); the bristles of the brush electrodes (31) are made of conductive ceramic fiber material, the conductive substrate of the brush electrodes (31) is electrically connected to the metal sheet A (21) and the metal sheet B (25) respectively, and the brush electrodes (31) are provided with independent power supply circuits.

2. The combined brush electrode ion plasma disinfection and purification module according to claim 1, characterized in that: The thickness of the high-pressure sheet (23) is no greater than 0.15 mm, the thickness of the metal sheet A (21) and the metal sheet B (25) is no greater than 0.2 mm, and the thickness of the first glass layer (22) and the second glass layer (24) is no greater than 1.3 mm.

3. The combined brush electrode ion plasma disinfection and purification module according to claim 2, characterized in that: The first glass layer (22) and the second glass layer (24) are both high borosilicate glass sheets, and the five-layer main structure is integrally fixed by high-temperature sintering process.

4. The combined brush electrode ion plasma disinfection and purification module according to claim 3, characterized in that: The conductive substrate of the brush electrode (31) is a copper substrate, and the conductive ceramic fiber bristles are doped with rare earth oxides, with a single fiber diameter of 0.08-0.12 mm.

5. A method for generating ion plasma based on the combined brush electrode ion plasma disinfection and purification module according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Pre-ionization and electric field establishment: A nanosecond pulse AC voltage with a frequency of 20kHz-50kHz and a peak voltage of 8kV-15kV is applied to the high-voltage sheet (23). At the same time, a reverse bias voltage with an amplitude of 1kV-2kV and opposite phase to the high-voltage sheet (23) is applied to the metal sheet A (21) and the metal sheet B (25) to form a strong alternating electric field inside the five-layer main structure. A 3kV DC superimposed pulse voltage is applied to the brush electrode (31) to form a local strong electric field at the tip of the brush bristles. S2, Synergistic Discharge Excitation: Under the action of the electric field established in step S1, the distributed discharge channel formed by the overlapping area of ​​the periodic microstructure in the five-layer main structure generates nanosecond pulse dielectric barrier discharge and generates initial plasma; at the same time, the brush tip of the brush electrode (31) generates stable corona discharge under the local strong electric field and releases seed electrons. S3, Ion plasma composite and reinforcement: Seed electrons released by the corona discharge at the tip of the brush electrode (31) are absorbed into the strong electric field region on the outer surface of the five-layer main structure and collide with the initial plasma generated by the nanosecond pulse dielectric barrier discharge, triggering a chain avalanche ionization reaction; by controlling the amplitude and phase of the reverse bias voltage, the ratio of positive and negative oxygen ions in the stable ion plasma formed after avalanche ionization is controlled between 1:1 and 1:

3. S4. Ion plasma guidance and spraying: Under the combined action of the alternating electric field and the space charge disturbance caused by the brush electrode (31), the ion plasma is accelerated and drawn out from the brush electrode (31) area at both ends and the side of the five-layer main structure along the length of the module, forming a uniformly diffused ion plasma cloud, and completing the air disinfection and purification.

6. The method for generating ionized plasma according to claim 5, characterized in that: In step S2, the pulse width of the nanosecond pulse dielectric barrier discharge is 50-200 nanoseconds.

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