A plasma device and control method for enhancing disinfection

Abstract

The present invention belongs to the technical field of low-temperature plasma generating equipment, and discloses a plasma device and a control method for enhancing disinfection. This method improves the distance of directional diffusion movement of active particles, as well as the probability and duration of collision between these active particles and pathogenic microorganisms through the coupling of dielectric barrier discharge and ion extraction electric field, thereby improving the disinfection efficiency without increasing the plasma intensity. The present invention solves the problem of high concentration of byproduct ozone emission while enhancing the disinfection efficiency while enhancing the plasma intensity in the prior art. Based on the dielectric barrier discharge technology, the present invention sets an ion extraction system in the particle diffusion area of ​​the dielectric barrier discharge to increase the diffusion distance of a large number of negatively charged disinfection factors in the plasma and the duration of action with pathogenic microorganisms.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-temperature plasma generating equipment, and in particular relates to a plasma device and a control method for enhancing disinfection. Background Art

[0002] Indoor air quality is an important health issue that is easily overlooked but extremely important in daily life. Good indoor air quality is directly related to health and quality of life. In particular, the spread of pathogenic microorganisms must be prevented. A large number of studies have shown that bioaerosols are the main way for pathogenic microorganisms to spread. Plasma disinfection technology is an effective means to block the spread of pathogenic microorganisms. The active oxygen and active nitrogen in plasma are the main factors in the antibacterial effect of plasma. These species include oxygen atoms (O), ozone (O3), hydrogen peroxide (H2O2), nitrite (NO2 - ), nitrate (NO3 - ), nitric oxide (NO*), hydroxyl radical (OH*), superoxide radical (O2 - ) and singlet oxygen ( 1 O2), and a large number of long-lived hydrated anions (O - (H2O) n , O2 - (H20) n )wait.

[0003] Existing plasma air disinfection mostly uses corona discharge plasma technology, which usually applies voltage to a needle, wire or other electrode with a very small radius of curvature, and releases active particles by applying DC voltages of different polarities, thereby achieving the purpose of purifying the air. However, due to the weak discharge intensity and low electron density of corona plasma, and the plasma is concentrated in a very small area around the needle tip and wire, the plasma size is very small and extremely uneven, resulting in a very limited number of active particles, which restricts the air purification efficiency, especially when used in a larger space. The purification efficiency is low. Dielectric barrier discharge plasma can solve the above problems well and produce a larger size and uniform plasma. Its generator uses paired electrodes and covers the electrode surface with an insulating medium. After applying AC high voltage or bipolar pulse high voltage to the electrodes, a dielectric barrier discharge plasma is generated on the surface of the insulating medium or between the insulating medium. This type of plasma contains high concentrations of active substances such as active oxygen. When contaminated or unclean air passes through the discharge plasma zone, it can achieve efficient disinfection and degradation of pathogenic microorganisms and volatile organic pollutants, thereby achieving the purpose of purifying the air. Since the electrode gap of the dielectric barrier discharge plasma generator is small, under the action of the AC electric field applied between the electrodes, the charged particles are bound between the electrode gaps, and only neutral particles can drift into the surrounding air through the airflow, thereby reducing the purification effect on the ambient air.

[0004] Therefore, in order to obtain satisfactory disinfection effects, it is necessary to increase the plasma intensity and treatment time. As the plasma treatment time increases and the plasma intensity increases, the air disinfection effect is better. Increasing the plasma intensity can significantly reduce the treatment time. For example, experimental studies have found that a plasma treatment with a 40J / L intensity and a treatment time of 0.13ms can achieve a 7-9 inactivation effect on E. coli; a plasma treatment with a 4J / L intensity and a treatment time of 1ms can achieve a 97% inactivation effect on E. coli, but it also produces ozone at a concentration of 28ppm.

[0005] The invention patent, a low-temperature plasma controlled disinfection device (publication number CN116123656A, publication date 20230516), discloses the use of a cylindrical ground electrode and multiple discharge electrodes arranged in a circular array. The discharge structure of this circular array structure greatly increases the discharge area. Its essence is to improve the efficiency of plasma disinfection of air by enhancing the discharge intensity, which will inevitably increase the ozone content in the air.

[0006] The invention patent of a plasma air disinfection treatment device (Announcement No. CN111773427B, Publication Date 20201016) discloses that the discharge intensity is adjusted according to whether there are people in the treatment environment. When there are people, the dielectric barrier discharge is weak discharge, producing low-concentration ozone; when there is no one in the environment, the dielectric barrier discharge is strong discharge, producing up to 20mg / m 3 of ozone.

[0007] Through the above analysis, the problems and defects of the existing technology are as follows: the existing technology cannot improve the efficiency of disinfection without increasing the plasma intensity, and while the existing technology enhances the plasma intensity to improve the disinfection efficiency, the by-product ozone emission concentration is high, causing harm to the environment. Summary of the invention

[0008] In order to overcome the problems existing in the related art, the disclosed embodiments of the present invention provide a plasma device and a control method for enhancing disinfection, and specifically relate to a dielectric barrier discharge plasma and an active particle injection device for air disinfection. The purpose of the present invention is to increase the distance of the directional diffusion movement of active particles, as well as the probability and duration of collision between these active particles and pathogenic microorganisms through the coupling of dielectric barrier discharge and ion extraction electric field, so as to improve the disinfection efficiency without increasing the plasma intensity. It solves the problem of high concentration of byproduct ozone emission while enhancing the disinfection efficiency in the prior art.

[0009] The technical solution is as follows: a plasma device for enhanced disinfection, the device comprising: a plurality of groups of electrode assemblies and a metal electrode mesh, the electrode assemblies comprising a high-voltage electrode assembly and a grounding electrode assembly;

[0010] The high-voltage electrode assembly and the grounding electrode assembly have the same structure, wherein the high-voltage electrode assembly includes a high-voltage electrode insulating tube with one end closed and a high-voltage electrode built inside the high-voltage electrode insulating tube;

[0011] The grounding electrode assembly includes a grounding electrode insulating tube with one end closed and a grounding electrode built into the grounding electrode insulating tube;

[0012] The high-voltage electrode assembly is parallel to and opposite to the ground electrode assembly, and a gap is provided between the high-voltage electrode insulation tube and the ground electrode insulation tube;

[0013] A dielectric barrier discharge plasma is generated inside the gap;

[0014] The high-voltage electrode of the high-voltage electrode assembly is connected in series to the anode of a diode, and the cathode of the diode is connected to a capacitor and a metal electrode mesh;

[0015] The electrode assembly is arranged in parallel with the metal electrode mesh and is provided with a gap G;

[0016] The metal electrode mesh is provided with a plurality of adjacent grid holes;

[0017] The gap is directly opposite to the grid hole of the metal electrode mesh, and the projection of the center of the gap on the metal electrode mesh coincides with the center of the grid hole.

[0018] Furthermore, the length of the overlapping portion of the high-voltage electrode and the grounding electrode is the length L of the gap; the distance between the high-voltage electrode insulating tube and the grounding electrode insulating tube is the spacing d of the gap, and the value of d is 0.1-2.0 mm.

[0019] Furthermore, the number of the electrode assemblies is n, where n≥1, and they are arranged in parallel and side by side and maintained on the same plane.

[0020] Furthermore, the interval G between the electrode assembly and the metal electrode mesh is 10-100 mm.

[0021] Furthermore, the metal electrode mesh has a smooth surface without sharp edges and a thickness of 2-5 mm.

[0022] Furthermore, the length L' of the grid hole is L+6 to L+15 mm, and the width D is d+6 to d+15 mm.

[0023] Further, the plurality of high-voltage electrodes are connected in series with a high-voltage conductor, and the plurality of grounding electrodes are connected in series with a grounding conductor;

[0024] The plasma device for enhanced disinfection also includes a dielectric barrier discharge power supply, which is an AC high-voltage power supply, and the high-voltage output ends of the dielectric barrier discharge power supply are respectively connected to the anodes of the high-voltage wire diodes.

[0025] Further, the grounding electrode of the grounding electrode assembly is grounded;

[0026] The high-voltage electrode insulating tube and the grounding electrode insulating tube are both quartz tubes or ceramic tubes.

[0027] Another object of the present invention is to provide a control method, which includes: increasing the diffusion distance of negatively charged disinfecting factors in dielectric barrier discharge plasma and the action time with pathogenic microorganisms through the coupling of dielectric barrier discharge and ion extraction electric field; at the same time, by adjusting the distance of the directional diffusion movement of active particles, the collision probability and action time of active particles with pathogenic microorganisms are enhanced, and without increasing the plasma intensity, the active particles diffuse into the environment through the gate holes to actively disinfect pathogenic microorganisms in the ambient air.

[0028] Furthermore, through the coupling of dielectric barrier discharge and ion extraction electric field, the AC signal output by the dielectric barrier discharge power supply is rectified and filtered into a pulsating DC signal through a diode and a capacitor, and applied to the metal electrode mesh.

[0029] Combining all the above technical solutions, the beneficial effects of the present invention are as follows: based on the dielectric barrier discharge technology, the present invention sets an ion extraction system in the particle diffusion area of ​​the dielectric barrier discharge to increase the number of negatively charged disinfecting factors in the plasma, such as NO2 - 、NO3 - 、O2 - and O-(H2O) n 、O2 - (H20) n At the same time, due to the directional movement of a large number of ions, the elastic collision with the neutral active particles of the plasma disinfection factor is enhanced, which brings about the directional movement of these neutral active particles, increases their diffusion distance and the action time with pathogenic microorganisms, and can achieve a satisfactory antibacterial effect without increasing or even reducing the plasma intensity, meeting the standard requirements of ozone concentration.

[0030] The present invention can solve the technical shortcomings of existing air disinfection equipment, that is, if the disinfection effect of the air is improved, the concentration of the sterilization factor (such as ozone) needs to be increased, and an environment for human-machine coexistence cannot be provided. If the concentration of the sterilization factor is reduced, the rapid and efficient air disinfection effect cannot be achieved, and the risk of infection of the crowd is increased. Therefore, after the technical solution of the present invention is transformed, there is no need to add complex and expensive equipment. By improving the utilization efficiency of active particles in the plasma, the disinfection efficiency is improved, and the application requirements for rapid and efficient disinfection of the air in an environment where humans and machines coexist are met. The equipment is simple to produce and low in price, and the market demand and commercial value are huge.

[0031] Traditional plasma air disinfection technology equipment mostly adopts corona discharge and dielectric barrier discharge, and has problems such as small plasma size, limited active particle diffusion area, and high by-product concentration to varying degrees. Plasma composite air purification with other technologies, such as plasma composite photocatalysis and adsorption, also has problems such as catalyst and adsorbent deactivation and increased consumables payment costs. The present invention cleverly solves the diffusion distance of negative ions in plasma that contribute to disinfection by coupling dielectric barrier discharge with the negative ion extraction electric field. Without increasing the plasma intensity and the resulting increase in by-products (such as ozone), it effectively improves the disinfection effect on the air and fills the technical gap in the field of air disinfection. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description, serve to explain the principles of the present disclosure;

[0033] Figure 1 Schematic diagram of a plasma device for enhanced disinfection provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of an electrode assembly provided by an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a metal electrode mesh provided by an embodiment of the present invention;

[0036] In the figure: 1. dielectric barrier discharge power supply; 2. electrode assembly; 3. high-voltage electrode assembly; 4. grounding electrode assembly; 5. high-voltage electrode insulating tube; 6. high-voltage electrode; 7. grounding electrode insulating tube; 8. grounding electrode; 9. high-voltage wire; 10. grounding wire; 11. plasma; 12. diode; 13. capacitor; 14. metal electrode mesh; 15. grid hole; 16. gap. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific implementation disclosed below.

[0038] The innovation of the present invention is that: the present invention generates a "curtain"-like plasma through a parallel arrangement of dual dielectric barrier discharges to perform the first step of disinfection treatment on pathogenic microorganisms in the flowing air, increases the movement range of active particles in the plasma through an ion extraction device, performs the second step of disinfection treatment in the plasma discharge area and the ion extraction area, diffuses a large number of negative ions out of the device into the surrounding air through the grid holes 15 on the ion extraction metal mesh, performs the third step of disinfection treatment, and improves the active disinfection capability. Ion extraction and plasma discharge share a power supply, which reduces costs and reduces the complexity of the system.

[0039] Embodiment 1, as Figure 1-Figure 3 As shown, the plasma device for enhanced disinfection provided by the embodiment of the present invention includes an electrode assembly 2 and a metal electrode mesh 14, wherein the electrode assembly 2 includes a high-voltage electrode assembly 3 and a grounding electrode assembly 4;

[0040] The high-voltage electrode assembly 3 and the grounding electrode assembly 4 have the same structure, wherein the high-voltage electrode assembly 3 includes a high-voltage electrode insulating tube 5 with one end closed and a built-in high-voltage electrode 6 (metal electrode);

[0041] The ground electrode assembly 4 includes a ground electrode insulating tube 7 with one end closed and a built-in ground electrode 8 (metal electrode);

[0042] The high-voltage electrode 6 of the high-voltage electrode assembly 3 is connected in series with the anode of a diode 12 , the cathode of the diode 12 is connected to a capacitor 13 and a metal electrode mesh 14 , and the other end of the capacitor 13 is grounded.

[0043] The high voltage electrode assembly 3 is arranged parallel to the ground electrode assembly 4 (eg Figure 2 As shown), a gap 16 is provided between the high-voltage electrode insulating tube 5 and the grounding electrode insulating tube 7. The size of the gap 16 is the length L and the spacing d of the gap 16. The value of d is between 0.1-2.0 mm.

[0044] When an alternating high voltage is applied between the high voltage electrode 6 and the ground electrode 8 in the high voltage electrode assembly 3 and the ground electrode assembly 4, a dielectric barrier discharge plasma 11 is generated in the above-mentioned gap 16. In an atmospheric pressure environment, the gap 16 (air gap) spacing (gap 16 of the electrode assembly 2) is the most important condition for obtaining a uniformly dispersed plasma 11 in an air dielectric barrier discharge (DBD). In a uniform electric field, the development of electron avalanche is proportional to exp(ɑd) (ɑ is the collision ionization coefficient). If the distance d of the gap 16 is too large, the electron avalanche in the air discharge is easily developed into a streamer discharge, which is not conducive to the uniform distribution of active particles in space.

[0045] In the embodiment, when the spacing of the gap 16 is between 0.1 mm and 2 mm, it is uniformly discharged, and the existence of discharge filaments cannot be observed by naked eyes or ordinary cameras; but when the spacing of the gap 16 (air gap) increases to 2.5 mm or more, the existence of filaments can be observed at the edge of the discharge area. If the spacing of the air gap continues to increase, obvious discharge filaments can be observed in the entire discharge area, and they move irregularly in the discharge space. Under atmospheric pressure conditions, the spacing of the gap 16 (air gap) is small, and the electric field strength on the high-voltage electrode assembly 3 is relatively low, which can effectively suppress the development speed of the electron avalanche, eliminate the development trend of the secondary avalanche, and help avoid the formation of filamentary discharge, and form a more uniform discharge plasma.

[0046] Preferably, the number of the electrode assemblies 2 is n, where n≥1, and they are arranged in parallel and side by side and kept on the same plane.

[0047] The electrode assembly 2 is arranged in parallel with the metal electrode mesh 14 (eg Figure 1 , Figure 2As shown), the interval G is 10-100mm.

[0048] The gap G, that is, the gap between the dielectric barrier discharge plasma 11 and the metal electrode mesh 14, determines the electric field distribution between the plasma and the metal electrode mesh. As the gap G increases, the axial electrostatic field distribution in the region is more uniform, the energy of the induced negative ions is more uniform, the emission direction consistency is better, and the collision probability and action time of the active particles in the region with the pathogenic microorganisms are increased, thereby improving the disinfection effect of the air flowing through the region; and, under the same grid hole 15 width condition, the increase in the gap G helps to reduce the collision between the extracted ions and the metal electrode mesh, reduce the loss of the extracted ions, and thus help to improve the ion extraction rate; but as the gap G increases, the electric field strength between the dielectric barrier discharge plasma 11 and the metal electrode mesh 14 becomes weaker, resulting in a decrease in the average kinetic energy of the extracted ions, thereby reducing the distance of the directional diffusion of the extracted ions, reducing the number and action distance of these active particles in the surrounding environment, thereby reducing the disinfection effect on the surrounding air; therefore, combined with the voltage applied to the dielectric barrier discharge, the gap G is between 10-100mm.

[0049] The gap 16 between the high-voltage electrode assembly 3 and the grounding electrode assembly 4 is directly opposite to the grid hole 15 of the metal electrode mesh, and the projection of the center of the gap 16 on the metal electrode mesh 14 coincides with the center of the grid hole 15 .

[0050] Such an arrangement helps to form a directional electric field between the dielectric barrier discharge plasma 11 and the metal electrode mesh 14, helps to increase the extraction rate of ions, enhances the diffusion of ions into the ambient air, and improves the effect and efficiency of actively disinfecting pathogenic microorganisms.

[0051] like Figure 1 , Figure 3 The metal electrode mesh 14 has a smooth surface without sharp edges and a thickness of 2-5 mm.

[0052] The metal electrode mesh 14 has a smooth surface without sharp edges to ensure that the metal electrode mesh 14 does not produce sharp discharge, avoid increasing the ion strength, and produce too much ozone. If the thickness is too large, the collision between the extracted ions and the metal electrode mesh 14 will increase, resulting in the loss of the extracted ions. In order to comprehensively avoid sharp discharge and improve the ion extraction rate, the thickness is selected to be 2-5 mm.

[0053] The size of the grid hole 15 is length L' and width D. The value of L' is between L+6 and L+15 mm, and the value of D is between d+6 and d+15 mm.

[0054] The dielectric barrier discharge plasma 11 is confined in the overlapping portion of the high voltage electrode 6 and the ground electrode 8 (metal electrode) in the high voltage electrode assembly 3 and the ground electrode assembly 4, that is, in the portion with a length L and a gap d (such as Figure 2 As shown), the size of the grid hole 15 is slightly larger than the size of the dielectric barrier discharge plasma 11, which helps to maximize the ion extraction.

[0055] When the size of the gate hole 15 is the same as the size of the dielectric barrier discharge plasma 11 (regarded as the gap 16), most of the ions collide and absorb with the metal electrode mesh 14 under the action of the electric field of the metal electrode mesh 14, and it is almost impossible to extract the ions into the ambient air. As the size of the gate hole 15 increases, the ion extraction rate shows a trend of first increasing and then decreasing. The value of the size of the above-mentioned gate hole 15 is based on the ion extraction rate, and is determined based on other parameters such as the interval between the metal electrode mesh and the plasma and the discharge voltage, to determine the optimal parameter range.

[0056] In an embodiment of the present invention, the plasma device for enhanced disinfection further includes a dielectric barrier discharge power supply 1, which is an AC high voltage power supply with a typical peak voltage range of 2.0-8.0 kV.

[0057] The ground electrode 8 of the ground electrode assembly 4 is grounded.

[0058] The high-voltage electrode insulating tube 5 and the grounding electrode insulating tube 7 are both quartz tubes or ceramic tubes.

[0059] The present invention also provides a method for controlling the injection of plasma active particles for enhancing disinfection, the method comprising:

[0060] By coupling the dielectric barrier discharge with the ion extraction electric field, the diffusion distance of the negatively charged disinfection factors in the dielectric barrier discharge plasma and the action time with pathogenic microorganisms are increased; at the same time, by adjusting the distance of the directional diffusion movement of the active particles, the collision probability and action time of the active particles with the pathogenic microorganisms are enhanced. Without increasing the plasma intensity, the active particles diffuse into the environment through the gate hole 15, actively disinfecting the pathogenic microorganisms in the ambient air.

[0061] Through the coupling of dielectric barrier discharge and ion extraction electric field, the AC signal output by the dielectric barrier discharge power supply 1 is rectified and filtered into a pulsating DC signal through a diode and a capacitor, and applied to the metal electrode mesh.

[0062] Example 2, as a specific implementation of the present invention, takes three groups of electrode assemblies 2 as an example. Figure 1-Figure 3As shown, a plasma device for enhanced disinfection includes a dielectric barrier discharge power supply 1, a metal electrode mesh 14 and three groups of electrode assemblies 2, one group of electrode assemblies 2 includes a high-voltage electrode assembly 3 and a grounding electrode assembly 4 with exactly the same structure, the high-voltage electrode 6 is placed in the high-voltage electrode insulating tube 5 to form the high-voltage electrode assembly 3, the grounding electrode 8 is placed in the grounding electrode insulating tube 7 to form the grounding electrode assembly 4, the high-voltage electrode insulating tube 5 and the grounding electrode insulating tube 7 have an outer diameter of 2mm and a wall thickness of 0.5mm, the high-voltage electrode 6 and the grounding electrode 8 have an outer diameter of 0.9mm, ensuring that they can be placed in their respective insulating tubes and fit tightly, the gap 16 between the high-voltage electrode insulating tube 5 and the grounding electrode insulating tube 7 is 1mm, and a uniform and stable dielectric barrier discharge plasma 11 is generated here.

[0063] The high-voltage electrodes 6 of the three groups of high-voltage electrode assemblies 3 are connected in series with high-voltage wires 9, and the grounding electrodes 8 of the three groups of grounding electrode assemblies 3 are connected in series with grounding wires 10. The high-voltage output end of the dielectric barrier discharge power supply 1 is connected to the high-voltage wire 9, and the high-voltage output end of the dielectric barrier discharge power supply 1 is connected to the anode of the diode 12, and the cathode of the diode 12 is connected to the capacitor 13 and the metal electrode mesh 14. The other end of the capacitor 13 is grounded, and the interval between the metal electrode mesh 14 and the electrode assembly 2 is 40 mm. The size of the dielectric barrier discharge plasma 11 is 10 mm in length (the length of the overlapping part of the high-voltage electrode 6 and the grounding electrode 8), and the thickness is 1 mm (the gap 16 between the high-voltage electrode insulation tube 5 and the grounding electrode insulation tube 7). The size L' of the metal electrode mesh 14 is 50 mm, the width D is 11 mm, and the thickness is 3 mm.

[0064] When the air containing pathogenic microorganisms can flow through the dielectric barrier discharge plasma 11 area through an organized flow, enter the area A between the dielectric barrier discharge plasma 11 and the metal electrode mesh 14, and then diffuse to the area B outside the entire device (surrounding environment), the AC voltage applied by the dielectric barrier discharge power supply 1 to the electrode assembly 2 is converted into a DC positive voltage after passing through the diode 12 and the capacitor 13 and applied to the metal electrode mesh 14; thus, a large number of negative ions are directed from the dielectric barrier discharge plasma 11 area under the action of the electric field. The metal electrode mesh 14 is then diffused to the outside of the entire device through the grid hole 15 of the metal mesh electrode 14. In this way, the pathogenic microorganisms in the air undergo a triple treatment, that is, the direct action of the dielectric barrier discharge plasma 11 area with the plasma, and then in the area A with a large number of active particles (negative ions and neutral active particles driven by collisions thereof), and in the area B outside the entire device, without increasing the plasma intensity, the disinfection efficiency of the pathogenic microorganisms is greatly improved. In addition, since a large number of active particles diffuse into the environment through the grid hole 15, the active disinfection efficiency of the ambient air is effectively promoted.

[0065] It can be seen from the above embodiments that the present invention, through the combination of dielectric barrier discharge and ion extraction electric field, expands the spatial diffusion range of these negative ions and other active particles (neutral particles) brought about by the collision of these negative ions by controlling the directional movement of negative ions without enhancing the plasma intensity, thereby increasing the interaction time between pathogenic microorganisms and these sterilization factors, thereby promoting the improvement of disinfection efficiency and reducing the emission of by-products such as ozone. In addition, the device rectifies and filters the AC signal output by the dielectric barrier discharge power supply 1 into a pulsating DC signal through a simple circuit (diode and capacitor), and applies it to the metal electrode mesh, reducing the complexity and cost of the device, and facilitating the application of miniaturization and portable scenarios.

[0066] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered within the protection scope of the present invention.

Claims

1. A plasma device for enhanced disinfection, characterized in that: The device comprises: a dielectric barrier discharge power source (1), a plurality of electrode assemblies (2) and a metal electrode mesh (14), wherein the electrode assembly (2) comprises a high-voltage electrode assembly (3) and a grounding electrode assembly (4), and the high-voltage electrode assembly (3) and the grounding electrode assembly (4) have the same structure. The high-voltage electrode assembly (3) comprises a high-voltage electrode insulating tube (5) with one end closed and a high-voltage electrode (6) built into the high-voltage electrode insulating tube (5); The grounding electrode assembly (4) comprises a grounding electrode insulating tube (7) with one end closed and a grounding electrode (8) built into the grounding electrode insulating tube (7); The high-voltage electrode assembly (3) and the grounding electrode assembly (4) are arranged in parallel and opposite to each other, and a gap (16) is provided between the high-voltage electrode insulating tube (5) and the grounding electrode insulating tube (7); A dielectric barrier discharge plasma (11) is generated inside the gap (16); The high-voltage electrode (6) of the high-voltage electrode assembly (3) is connected in series to the anode of a diode (12), and the cathode of the diode (12) is connected to a capacitor (13) and a metal electrode mesh (14); The electrode assembly (2) is arranged in parallel with the metal electrode mesh (14) and is provided with a gap G; The metal electrode mesh (14) is provided with a plurality of adjacent grid holes (15); The gap (16) is directly opposite to the grid hole (15) of the metal electrode mesh, and the projection of the center of the gap (16) on the metal electrode mesh (14) coincides with the center of the grid hole (15); The dielectric barrier discharge power supply (1) is an AC high-voltage power supply, and the high-voltage output end of the dielectric barrier discharge power supply (1) is respectively connected to the anode of the high-voltage wire (9) and the diode (12).

2. The plasma device for enhanced disinfection according to claim 1, characterized in that: The length of the overlapping portion of the high-voltage electrode (6) and the grounding electrode (8) is the length L of the gap (16); the distance between the high-voltage electrode insulating tube (5) and the grounding electrode insulating tube (7) is the spacing d of the gap (16), and the value of d is 0.1-2.0 mm.

3. The plasma device for enhanced disinfection according to claim 1, characterized in that: The number of the electrode assemblies (2) is n, where n≥1, and they are arranged in parallel and side by side and maintained on the same plane.

4. The plasma device for enhanced disinfection according to claim 1, characterized in that: The interval G between the electrode assembly (2) and the metal electrode mesh (14) is 10-100 mm.

5. The plasma device for enhanced disinfection according to claim 1, characterized in that: The metal electrode mesh (14) has a smooth surface without sharp edges and a thickness of 2-5 mm.

6. The plasma device for enhanced disinfection according to claim 2, characterized in that: The length L' of the grid hole (15) is between L+6 and L+15 mm, and the width D is between d+6 and d+15 mm.

7. The plasma device for enhanced disinfection according to claim 1, characterized in that: A plurality of high-voltage electrodes (6) are connected in series by a high-voltage conductor (9), and a plurality of grounding electrodes (8) are connected in series by a grounding conductor (10).

8. The plasma device for enhanced disinfection according to claim 1, characterized in that: The grounding electrode (8) of the grounding electrode assembly (4) is grounded; the high-voltage electrode insulating tube (5) and the grounding electrode insulating tube (7) are both quartz tubes or ceramic tubes.

9. A control method, characterized in that: The method is implemented by the plasma device for enhanced disinfection according to any one of claims 1 to 8, and the method comprises: By coupling dielectric barrier discharge with ion extraction electric field, the diffusion distance of negatively charged disinfecting factors in dielectric barrier discharge plasma and the action time with pathogenic microorganisms are increased; at the same time, by adjusting the distance of directional diffusion movement of active particles, the collision probability and action time of active particles with pathogenic microorganisms are enhanced. Without increasing the plasma intensity, the active particles diffuse into the environment through the grid holes (15), thereby actively disinfecting pathogenic microorganisms in the ambient air.

10. The control method according to claim 9, characterized in that: Through the coupling of dielectric barrier discharge and ion extraction electric field, the AC signal output by the dielectric barrier discharge power supply (1) is rectified and filtered into a pulsating DC signal through a diode and a capacitor, and applied to a metal electrode net.

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