Electrode structure and air purification device

Abstract

The application relates to the technical field of air purification, and discloses an electrode structure and an air purification device, which comprise a high-voltage electrode, a first insulating medium arranged on one side of the high-voltage electrode, a second insulating medium arranged on the other side of the high-voltage electrode, a first grounding electrode arranged on the side of the first insulating medium away from the high-voltage electrode, and a second grounding electrode arranged on the side of the second insulating medium away from the high-voltage electrode, wherein the second grounding electrode is arranged in a staggered mode with the first grounding electrode; and the first insulating medium and the second insulating medium are both adapted to contact air. The application forms a double-sided plasma discharge area, and compared with the related art, the total amount of generated plasma is greatly increased; meanwhile, the first insulating medium and the second insulating medium can directly contact the flowing air, and compared with the single-sided contact structure in the related art, the contact area of the plasma and the air is effectively expanded.

Description

Technical Field

[0001] This invention relates to the field of air purification technology, specifically to electrode structures and air purification devices. Background Technology

[0002] With increasing attention being paid to indoor air quality, air purification technologies are constantly developing. Among them, dielectric barrier discharge technology, due to its ability to generate a large number of active particles (such as free radicals, ozone, and ions), is widely used in the degradation and sterilization of air pollutants.

[0003] The electrode structure that generates dielectric barrier discharge in related technologies typically includes an inner electrode, an outer electrode, and an insulating medium. The inner electrode is connected to a high voltage, the outer electrode is grounded, and the insulating medium is placed between the outer electrode and the inner electrode. The outer electrode has a hollow area, which discharges to generate plasma. When air passes through the surface of the outer electrode, the plasma purifies the air.

[0004] Because in related technologies, air can only come into contact with one side of the electrode structure for purification, and the contact area between the electrode structure and the air is limited, the purification efficiency is low. Summary of the Invention

[0005] In view of this, the present invention provides an electrode structure and an air purification device to solve the problem of low purification efficiency caused by the fact that air can only contact one side of the electrode structure for purification in related technologies.

[0006] In a first aspect, the present invention provides an electrode structure, comprising: High-voltage electrode; A first insulating medium is disposed on one side of the high-voltage electrode; A second insulating medium is disposed on the other side of the high-voltage electrode; The first grounding electrode is located on the side of the first insulating medium away from the high voltage electrode; The second grounding electrode is located on the side of the second insulating medium away from the high voltage electrode, and the second grounding electrode is staggered from the first grounding electrode. Both the first insulating medium and the insulating medium are suitable for contact with air.

[0007] Beneficial effects: When the high-voltage electrode is connected to the high-voltage end of the power supply, and the first and second grounding electrodes are connected to the grounding end of the power supply, a discharge circuit is formed between the high-voltage electrode, the first insulating medium, and the first grounding electrode; a discharge circuit is also formed between the high-voltage electrode, the second insulating medium, and the second grounding electrode. A symmetrical high-voltage electric field is formed between the high-voltage electrode and the first and second grounding electrodes on both sides. The electric field passes through the first insulating medium and generates plasma through glow discharge on its surface. Similarly, the electric field passes through the second insulating medium and generates plasma through glow discharge on its surface. Therefore, this electrode structure forms a double-sided plasma discharge region, significantly increasing the total plasma generation compared to related technologies. Furthermore, both the first and second insulating media can directly contact the flowing air, effectively expanding the contact area between the plasma and air compared to the single-sided contact structure in related technologies. Because the second grounding electrode is staggered with the first grounding electrode, the strong electric field region corresponding to the first grounding electrode and the strong electric field region corresponding to the second grounding electrode can fill and overlap each other, ensuring no weak gaps in the electric field within the overall projection plane of the electrode. This achieves a highly uniform electric field intensity and stable discharge across the entire region. Because air can simultaneously receive the action of active particles and plasma on both sides of the electrode structure, the degradation and sterilization of pollutants are more complete, which can significantly improve the overall air purification efficiency.

[0008] In one alternative embodiment, the electrode structure has an initial processing state in the form of a flat plate, and a working state after being wound or bent from the flat plate.

[0009] Beneficial effects: The initial flat shape of the electrode structure facilitates processing, effectively reducing machining difficulty and mass production costs, and improving product yield and assembly efficiency. After machining, winding or bending the electrode structure reduces its space requirements, ensuring sufficient contact between air and both surfaces, thus enhancing air purification.

[0010] In one optional embodiment, in the working state, the cross-section of the electrode structure is one of the following: annular, mosquito coil-shaped, or wavy.

[0011] Beneficial Effects: When the cross-section of the electrode structure is annular, the entire electrode structure is essentially a hollow cylinder. Air can pass through and contact both inside and outside the electrode structure, allowing for simultaneous air purification on both sides. Furthermore, the flow channels on the inner side of the electrode structure extend the contact time between air and plasma / active particles, completely eliminating the airflow dead zones of traditional single-sided purification and ensuring air purification efficiency. When the cross-section of the electrode structure is coil-shaped, a multi-layered concentric, meandering cross-sectional structure is formed within a limited radial space, constructing a multi-layered annular reciprocating flow channel. Without increasing the overall axial volume of the equipment, this greatly extends the effective airflow path and increases the number of purification cycles within the discharge area. The coil-shaped structure fully utilizes planar space to achieve compact, multi-layered purification, effectively solving the pain points of insufficient space and short purification path in small, ultra-thin purification equipment. It achieves high airflow and high purification precision within a small volume device. When the cross-section of the electrode structure is wavy, the contact area between the two sides and the airflow can be expanded. At the same time, the wavy cross-section can actively disturb the flat laminar airflow, break the uniform flow state of the airflow, and promote the turbulent mixing effect of the airflow. This avoids the problem of the airflow rushing past the wall and insufficient local airflow purification, so that the air can fully and uniformly contact the plasma active particles on both sides, significantly improving the uniformity of air purification and the qualified rate of pollutant removal of the whole machine.

[0012] In one alternative embodiment, during the initial processing state, the first grounding electrode comprises a plurality of parallel first metal wires, which are formed on the surface of the first insulating medium by a screen printing process.

[0013] Beneficial effects: In the initial processing state, the first grounding electrode consists of multiple parallel metal wires. These wires are formed on the surface of the first insulating medium using a screen printing process. Screen printing offers significant advantages in terms of high forming precision, uniform thickness, and good consistency, ensuring that the diameter, spacing, and arrangement angle of each metal wire are highly uniform, effectively guaranteeing a uniform and regular electric field distribution throughout the electrode area. Furthermore, the surface of the metal wires prepared by the screen printing process is continuous, smooth, and free of sharp protrusions, effectively eliminating the point discharge phenomenon caused by electric field concentration and suppressing excessive ozone generation from the physical structural source.

[0014] In one alternative embodiment, during the initial processing state, the second grounding electrode comprises a plurality of parallel second metal wires, which are formed on the surface of the second insulating medium by a screen printing process.

[0015] Beneficial effects: In the initial processing state, the second grounding electrode consists of multiple parallel second metal wires. These wires are formed on the surface of the second insulating medium using a screen printing process. Screen printing offers significant advantages in terms of high forming precision, uniform thickness, and good consistency, ensuring that the diameter, spacing, and arrangement angle of each second metal wire are highly uniform, effectively guaranteeing a uniform and regular electric field distribution throughout the electrode area. Furthermore, the surface of the second metal wires prepared by screen printing is continuous, smooth, and free of sharp protrusions, effectively eliminating the point discharge phenomenon caused by electric field concentration and suppressing excessive ozone generation from the physical structural source.

[0016] In one alternative embodiment, during the initial processing state, the second metal wire is located between two adjacent first metal wires on a projection plane parallel to the high-voltage electrode.

[0017] Beneficial Effects: On the projection plane parallel to the high-voltage electrode, the second metal wire is located between two adjacent first metal wires. The staggered arrangement of the first and second metal wires compensates for the relatively weak electric field strength and low local plasma concentration between two adjacent metal wires on one side. This allows the strong electric field regions corresponding to the first and second metal wires to fill and overlap each other, eliminating weak gaps in the electric field across the entire projection plane of the electrode. This achieves a highly uniform electric field strength and stable discharge across the entire area. The staggered arrangement of the first and second metal wires ensures that the airflow passing through both sides of the electrode structure can come into contact with high-concentration, uniformly distributed active particles, effectively solving the problems of incomplete local purification and pollutant residue. Simultaneously, the staggered and overlapping electric field distribution further enhances the spatial electric field coupling, improving overall discharge efficiency. Without increasing energy consumption or structural volume, it significantly improves the air purification coverage and uniformity of the entire electrode surface, further enhancing the overall purification performance and operational stability of the equipment.

[0018] In one optional embodiment, in the operating state, the cross-section of the electrode structure is annular, and the first metal wire and the second metal wire are arranged in a spiral shape.

[0019] Beneficial effects: Both the first and second metal wires are spirally arranged, forming spiral discharge channels on the inner and outer sides of the electrode structure. This allows the airflow to meander along a spiral trajectory as it passes through the inner and outer sides of the electrode structure, effectively extending the residence time and reaction distance of the air within the dielectric barrier discharge region. This ensures sufficient and sustained contact and reaction between air pollutants, bacteria, microorganisms, and the active particles of the plasma on both sides, significantly improving the degradation and inactivation efficiency of VOCs, odors, bacteria, and viruses. Furthermore, the spiral-shaped first and second metal wires can disturb the airflow, continuously cutting and agitating it through the spiral structure, inducing turbulent rotation and enhancing the turbulent mixing effect. This ensures sufficient disturbance of the airflow on both sides of the electrode structure, preventing excessively high airflow velocities and further extending the contact time between the airflow and the plasma.

[0020] In one alternative embodiment, the high-voltage electrode is formed by spraying, coating, or printing a conductive material onto the surface of the first insulating medium or the second insulating medium.

[0021] Beneficial effects: The high-voltage electrode is formed by spraying, coating, or printing conductive materials onto the surface of the first or second insulating medium. Therefore, the high-voltage electrode is integrated with the first or second insulating medium, ensuring a tight, gapless fit between them. This also guarantees uniform electrode thickness and good conductive continuity, resulting in a stable high-voltage electric field output without localized electric field distortion. This provides a stable electric field foundation for uniform discharge through bilateral dielectric barriers, further improving the uniformity and consistency of plasma generation. Simultaneously, the integrated forming process of spraying, coating, and printing is simple and highly compatible, eliminating the need for complex machining and assembly steps such as cutting, stamping, welding, and screw fixing of the high-voltage electrode. This significantly simplifies the overall electrode production process, effectively reducing the number of parts, lowering material costs, and reducing manual assembly errors. In addition, the integrated molding structure is lightweight and thin, and more flexible, which can be adapted to the electrode structure to be bent and wound into various shapes. During the winding or bending process of the electrode structure, defects such as electrode detachment, cracking, and disconnection are less likely to occur, effectively ensuring the discharge reliability under irregular structure, and taking into account the product's manufacturability, structural plasticity and long-term working stability.

[0022] In one alternative embodiment, the first insulating medium and the second insulating medium are formed by wrapping an insulating film around the high-voltage electrode.

[0023] Beneficial effects: The insulating film can be tightly bonded to the high-voltage electrode, forming a first and second insulating medium with consistent thickness. This ensures consistent performance between the first and second insulating media and guarantees stable insulation performance. It effectively eliminates safety hazards such as localized leakage, creepage, and breakdown of the high-voltage electrode, meeting the insulation requirements of double-sided dielectric barrier discharge, ensuring uniform electric field distribution, and further improving the safety and stability of the discharge process. Simultaneously, the structure formed by wrapping the insulating film is lightweight, thin, and more flexible, allowing for subsequent bending and winding of the electrode structure into various shapes. Defects such as electrode detachment, cracking, and disconnection are less likely to occur during winding or bending, effectively ensuring discharge reliability under irregular structures. This balances product manufacturability, structural plasticity, and long-term operational stability. Furthermore, the insulating film wrapping the high-voltage electrode also prevents moisture and dust from entering the electrode, avoiding oxidation, dust accumulation, and aging, thus improving the long-term operational stability of the high-voltage electrode and ensuring that the equipment's long-term purification performance does not decline.

[0024] In one optional embodiment, the electrode structure is in the shape of a hollow cylinder, with a first air flow channel formed on the inner circumference of the electrode structure and a second air flow channel formed on the outer circumference of the electrode structure. The first grounding electrode is disposed in the first air flow channel, and the second grounding electrode is disposed in the second air flow channel.

[0025] Beneficial effects: A first airflow channel is formed on the inner periphery of the electrode structure, and a second airflow channel is formed on the outer periphery of the electrode structure. Both the first and second airflow channels allow air to pass through, enabling air purification to be carried out simultaneously on the inner and outer sides of the electrode structure. Furthermore, the first airflow channel can limit the direction of airflow, prolonging the contact time between air and plasma and active particles, completely eliminating the airflow dead zones of traditional single-sided purification, and ensuring air purification efficiency.

[0026] In one alternative embodiment, the first grounding electrode is arranged in a spiral shape on the inner surface of the first insulating medium; The second grounding electrode is spirally disposed on the outer surface of the second insulating medium.

[0027] Beneficial effects: The first grounding electrode is spirally arranged on the inner surface of the first insulating medium, and the second grounding electrode is spirally arranged on the outer surface of the second insulating medium. This forms spiral discharge channels on the inner and outer sides of the electrode structure. This allows the airflow to meander along a spiral trajectory as it passes through the first and second airflow channels on both sides of the electrode structure, effectively extending the residence time and reaction distance of the air within the dielectric barrier discharge area. This ensures sufficient and sustained contact and reaction between air pollutants, bacteria, microorganisms, and the active particles of the plasma on both sides, significantly improving the degradation and inactivation efficiency of VOCs, odors, bacteria, and viruses. Furthermore, the spiral-shaped first and second grounding electrodes can disturb the airflow, continuously cutting and disturbing it through the spiral structure, inducing turbulent rotation and enhancing the turbulent mixing effect. This ensures sufficient disturbance of the airflow on both sides of the electrode structure, preventing excessively high airflow velocity and further extending the contact time between the airflow and the plasma.

[0028] In one optional embodiment, the first grounding electrode and the second grounding electrode have the same helical direction and pitch, and are offset along the axial direction.

[0029] Beneficial effects: The first and second grounding electrodes have the same spiral direction and pitch, and the electric field formed by the high-voltage electrode and the first and second grounding electrodes on both sides is the same. The first and second grounding electrodes are staggered along the axial direction, which enhances the discharge synergy effect. It can make up for the defects of relatively weak electric field strength and low local plasma concentration in the middle of the two spirals on one side, so that the strong electric field regions on both sides fill each other and cross-cover each other, achieving the technical effect of highly uniform electric field strength and stable discharge throughout the entire area.

[0030] Secondly, the present invention also provides an air purification device, comprising: At least one of the electrode structures is provided, wherein the high-voltage electrode is connected to the high-voltage terminal of the power supply module, and the first ground electrode and the second ground electrode are connected to the ground terminal of the power supply module.

[0031] Beneficial Effects: This air purification device forms a symmetrical high-voltage electric field between the high-voltage electrode and the first and second grounding electrodes on both sides. The electric field passes through the first insulating medium, generating plasma through its surface with a glow discharge. Similarly, the electric field passes through the second insulating medium, generating plasma through its surface with a glow discharge, thus creating a double-sided plasma discharge region. Compared to related technologies, this significantly increases the total amount of plasma generated. Furthermore, both the first and second insulating media can directly contact the flowing air, effectively expanding the contact area between the plasma and air compared to the single-sided contact structure in related technologies. Because the air can simultaneously receive the action of active particles and plasma on both sides of the electrode structure, the degradation and sterilization of pollutants are more complete, significantly improving the overall air purification efficiency.

[0032] In one alternative embodiment, the air purification device further includes an air guide structure for ensuring that air flows evenly across both sides of the electrode structure.

[0033] Beneficial effects: By setting up an air guide structure, it can be ensured that air flows evenly across both sides of the electrode structure, thereby improving purification efficiency. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of an electrode structure in its initial processing state according to an embodiment of the present invention; Figure 2 This is a schematic diagram of an electrode structure of the present invention wound into a cross-section resembling a mosquito coil. Figure 3 This is a schematic diagram of an electrode structure of the present invention wound into a wavy cross-section; Figure 4 This is a schematic diagram of an electrode structure in the shape of a cylinder according to an embodiment of the present invention; Figure 5 This is a half-section cross-sectional view of an electrode structure according to an embodiment of the present invention at the longitudinal section; Figure 6 This is a schematic diagram of an air purification device according to an embodiment of the present invention, wherein the device has multiple electrode structures. Figure 7 This is a top view of an air purification device according to an embodiment of the present invention when it has multiple electrode structures; Figure 8 This is a schematic diagram of an air purification device according to an embodiment of the present invention, provided with an air guiding structure.

[0036] Explanation of reference numerals in the attached figures: 1. Electrode structure; 101. High voltage electrode; 102. First insulating medium; 103. Second insulating medium; 104. First grounding electrode; 1041. First metal wire; 105. Second grounding electrode; 1051. Second metal wire; 2. Air guide structure; 3. First air flow channel. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0038] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] With increasing attention being paid to indoor air quality, air purification technologies are constantly developing. Among them, dielectric barrier discharge technology, due to its ability to generate a large number of active particles (such as free radicals, ozone, and ions), is widely used in the degradation and sterilization of air pollutants.

[0042] The electrode structure that generates dielectric barrier discharge in related technologies typically includes an inner electrode, an outer electrode, and an insulating medium. The inner electrode is connected to a high voltage, the outer electrode is grounded, and the insulating medium is placed between the outer electrode and the inner electrode. The outer electrode has a hollow area, which discharges to generate plasma. When air passes through the surface of the outer electrode, the plasma purifies the air.

[0043] Because in related technologies, air can only come into contact with one side of the electrode structure for purification, and the contact area between the electrode structure and the air is limited, the purification efficiency is low.

[0044] Because the relevant technologies only allow air to contact one side of the electrode structure for purification, the air purification equipment requires a huge flow channel space to achieve sufficient air volume, resulting in large equipment size and footprint. Furthermore, the discharge process can easily generate localized high field strength, leading to excessive ozone generation and making it difficult to meet environmental emission standards.

[0045] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0046] According to an embodiment of the present invention, an electrode structure 1 is provided, including a high-voltage electrode 101, a first insulating medium 102, a second insulating medium 103, a first grounding electrode 104, and a second grounding electrode 105.

[0047] The first insulating medium 102 is disposed on one side of the high-voltage electrode 101; the second insulating medium 103 is disposed on the other side of the high-voltage electrode 101; the first grounding electrode 104 is disposed on the side of the first insulating medium 102 away from the high-voltage electrode 101; the second grounding electrode 105 is disposed on the side of the second insulating medium 103 away from the high-voltage electrode 101, and the second grounding electrode 105 and the first grounding electrode 104 are staggered. Both the first grounding electrode 104 and the second grounding electrode 105 are suitable for contact with air.

[0048] In this embodiment, when the high-voltage electrode 101 is connected to the high-voltage terminal of the power supply, and the first ground electrode 104 and the second ground electrode 105 are connected to the ground terminal of the power supply, a discharge circuit is formed between the high-voltage electrode 101, the first insulating medium 102, and the first ground electrode 104; a discharge circuit is also formed between the high-voltage electrode 101, the second insulating medium 103, and the second ground electrode 105. A symmetrical high-voltage electric field is formed between the high-voltage electrode 101 and the first ground electrode 104 and the second ground electrode 105 on both sides. The electric field passes through the first insulating medium 102 and generates plasma through glow discharge on the surface of the first insulating medium 102. The electric field also passes through the second insulating medium 103 and generates plasma through glow discharge on the surface of the second insulating medium 103. Therefore, the electrode structure 1 forms a double-sided plasma discharge region. Compared with related technologies, the total amount of plasma generated is significantly increased. At the same time, both the first insulating medium 102 and the second insulating medium 103 can directly contact the flowing air. Compared with the single-sided contact structure in related technologies, the contact area between the plasma and the air is effectively expanded. Because the second grounding electrode 105 is staggered with the first grounding electrode 104, the strong electric field regions corresponding to the first grounding electrode 104 and the second grounding electrode 105 can fill and overlap each other, ensuring no weak gaps in the electric field within the overall projection plane of the electrodes. This achieves a highly uniform electric field intensity and stable discharge across the entire area. Since air can simultaneously receive the effects of active particles and plasma on both sides of the electrode structure 1, the degradation and sterilization of pollutants are more complete, significantly improving the overall air purification efficiency.

[0049] Because this electrode structure 1 forms a double-sided plasma discharge region, compared with related technologies, a single electrode structure 1 can achieve twice the air handling capacity, and the air handling volume per unit space can be significantly increased. Therefore, compared with related technologies, while ensuring the same purification air volume and the same purification effect, there is no need to design a large-sized airflow channel, which can greatly compress the internal structural space of the equipment, effectively reduce the overall volume and footprint of the air purification equipment, and make the equipment structure more compact. It is suitable for various small installation scenarios such as home, commercial, and embedded applications, and reduces the cost of equipment production, transportation, and space deployment.

[0050] In a preferred embodiment, such as Figure 1 and Figure 5As shown, the first insulating medium 102 and the second insulating medium 103 are symmetrically arranged, and the first grounding electrode 104 and the second grounding electrode 105 are distributed in the same way, so that the discharge electric field intensity on both sides is uniform, the discharge conditions are completely consistent, the plasma distribution on both sides is uniform and highly stable, and there are no problems such as uneven local discharge intensity or plasma blank areas. The characteristics of dielectric barrier discharge, combined with the symmetrical structure, can continuously suppress arc discharge and spark discharge phenomena, avoid the problems of local overheating and excessive wear of electrodes, and significantly improve the service life of electrode structure 1 and the operational stability of the equipment. At the same time, the airflow can obtain plasma purification treatment of equal intensity and effect regardless of which side of the electrode it flows through, greatly improving the uniformity of air purification of the whole machine, eliminating the problems of incomplete local purification and inconsistent purification effects, and ensuring that the equipment outputs high-quality air purification effect in a long-term stable manner.

[0051] In one specific embodiment, the first insulating medium 102 is a ceramic film, a PET film, or an alumina coating, etc., and the second insulating medium 103 is made of the same material as the first insulating medium 102. In an alternative embodiment, the first insulating medium 102 and the second insulating medium 103 can be glass ceramics doped with nano-zinc oxide to improve the dielectric constant and discharge stability.

[0052] In one embodiment, the electrode structure 1 has an initial processing state in the shape of a flat plate, and a working state after being wound or bent from the shape of a flat plate.

[0053] In this embodiment, the electrode structure 1 is initially flat, which facilitates its processing and effectively reduces the difficulty of electrode processing and the cost of mass production, thereby improving product yield and assembly efficiency. After the electrode structure 1 is processed, it can be wound or bent to reduce the space occupied by the electrode structure 1 and ensure that air can fully contact the two sides of the electrode structure 1, thus improving the air purification effect.

[0054] Furthermore, due to its excellent bending and winding flexibility, electrode structure 1 can be flexibly bent into any irregular shape such as arc, ring, or U-shape according to the internal flow channel structure, cavity shape, and installation space requirements of air purification equipment, adapting to various equipment structures such as tubular, box-type, and embedded types. Compared to the traditional fixed and undeformable electrode structure 1, it completely solves the technical pain points of the traditional electrode structure 1, such as its single shape, poor adaptability, and difficulty in adapting to irregular flow channels and special cavity equipment. It can maximize the fit with the airflow channel structure of the equipment, reduce the structural assembly gap, reduce airflow dead angles, further improve space utilization and airflow purification coverage, and significantly improve the versatility and equipment adaptability of electrode structure 1.

[0055] In one embodiment, under working conditions, the cross-section of electrode structure 1 is one of the following: circular, coil-shaped, or wavy.

[0056] In this embodiment, when the cross-section of electrode structure 1 is annular, electrode structure 1 is essentially a hollow cylinder. Air can pass through and contact both the inner and outer sides of electrode structure 1, allowing air purification to occur simultaneously on both sides. Furthermore, the flow channel on the inner side of electrode structure 1 can prolong the contact time between air and plasma / active particles, completely eliminating the airflow dead zones inherent in traditional single-sided purification and ensuring air purification efficiency. When the cross-section of electrode structure 1 is coil-shaped, such as... Figure 2 As shown, a multi-layered concentric, meandering cross-sectional structure is formed within a limited radial space, constructing a multi-layered annular reciprocating flow channel. Without increasing the overall axial volume of the equipment, this significantly extends the effective airflow path and increases the number of purification cycles within the discharge area. The mosquito coil-like structure fully utilizes planar space to achieve compact multi-layered purification, effectively solving the problems of insufficient space and short purification path in small, ultra-thin purification equipment. It achieves high airflow and high purification precision within a small volume device. When the cross-section of electrode structure 1 is wavy, as... Figure 3 As shown, it can expand the contact area between the airflow on both sides. At the same time, the wavy cross section can actively disturb the flat laminar airflow, break the uniform flow state of the airflow, and promote the turbulent mixing effect of the airflow. This avoids the problem of the airflow quickly passing over the wall and the insufficient purification of local airflow. It allows the air to fully and uniformly contact the plasma active particles on both sides, which significantly improves the uniformity of air purification and the qualified rate of pollutant removal of the whole machine.

[0057] In one embodiment, during the initial processing state, such as Figure 1 As shown, the first grounding electrode 104 includes multiple parallel first metal wires 1041, which are formed on the surface of the first insulating medium 102 by screen printing.

[0058] In this embodiment, during the initial processing, the first grounding electrode 104 is composed of multiple parallel first metal wires 1041. These first metal wires 1041 are formed on the surface of the first insulating medium 102 using a screen printing process. Screen printing offers significant advantages such as high forming precision, uniform thickness, and good consistency, ensuring that the diameter, spacing, and arrangement angle of each first metal wire 1041 are highly uniform, effectively guaranteeing a uniform and regular electric field distribution throughout the electrode area. Furthermore, the surface of the first metal wires 1041 prepared by the screen printing process is continuous, smooth, and free of sharp protrusions, effectively eliminating the point discharge phenomenon caused by electric field concentration and suppressing excessive ozone generation from the physical structural source.

[0059] In one specific embodiment, the original material of the first metal wire 1041 is silver paste or carbon paste, which is formed by screen printing the silver paste or carbon paste onto the surface of the first insulating medium 102.

[0060] In an alternative embodiment, laser micromachining technology can be used instead of screen printing.

[0061] In one embodiment not shown in the figure, the first ground electrode 104 may also be a mesh electrode.

[0062] In one embodiment, during the initial processing state, such as Figure 1 As shown, the second grounding electrode 105 includes multiple parallel second metal wires 1051, which are formed on the surface of the second insulating medium 103 by screen printing.

[0063] In this embodiment, during the initial processing, the second grounding electrode 105 is composed of multiple parallel second metal wires 1051. These second metal wires 1051 are formed on the surface of the second insulating medium 103 using a screen printing process. Screen printing offers significant advantages such as high forming precision, uniform thickness, and good consistency, ensuring that the diameter, spacing, and arrangement angle of each second metal wire 1051 are highly uniform, effectively guaranteeing a uniform and regular electric field distribution throughout the electrode area. Furthermore, the surface of the second metal wires 1051 prepared by screen printing is continuous, smooth, and free of sharp protrusions, effectively eliminating the point discharge phenomenon caused by electric field concentration and suppressing excessive ozone generation from the physical structural source.

[0064] In one specific embodiment, the original material of the second metal wire 1051 is silver paste or carbon paste, which is formed by screen printing the silver paste or carbon paste onto the surface of the second insulating medium 103.

[0065] In one embodiment not shown in the figure, the second grounding electrode 105 may also be a mesh electrode.

[0066] In one embodiment, during the initial processing state, on a projection plane parallel to the high-voltage electrode 101, the second metal wire 1051 is located between two adjacent first metal wires 1041.

[0067] In this embodiment, on the projection plane parallel to the high-voltage electrode 101, the second metal wire 1051 is located between two adjacent first metal wires 1041. The staggered arrangement of the first metal wires 1041 and the second metal wire 1051 can compensate for the defects of relatively weak electric field strength and low local plasma concentration between two adjacent metal wires on one side. This allows the strong electric field regions corresponding to the positions of the first metal wire 1041 and the second metal wire 1051 to fill and overlap each other, ensuring that there are no weak gaps in the electric field within the overall projection plane of the electrode. This achieves the technical effect of highly uniform electric field strength and stable discharge throughout the entire area. By staggering the arrangement of the first metal wires 1041 and the second metal wire 1051, the airflow flowing through both sides of the electrode structure 1 can come into contact with high-concentration, uniformly distributed active particles, effectively solving the problems of incomplete local purification and pollutant residue. Meanwhile, the staggered electric field distribution can further enhance the spatial electric field coupling effect, improve the overall discharge efficiency, and significantly improve the air purification coverage and purification uniformity of the entire electrode without increasing energy consumption and structural volume, thereby further improving the overall purification performance and working stability of the equipment.

[0068] Specifically, the electric field between the two second metal wires 1051 is the weakest, and the first metal wire 1041 can strengthen the electric field between the two second metal wires 1051. Similarly, the electric field between the two first metal wires 1041 is the weakest, and the second metal wire 1051 can strengthen the electric field between the two first metal wires 1041.

[0069] In one embodiment, in the working state, the cross-section of the electrode structure 1 is annular, and the first metal wire 1041 and the second metal wire 1051 are arranged in a spiral shape.

[0070] In this embodiment, both the first metal wire 1041 and the second metal wire 1051 are spirally arranged, forming spiral discharge channels on the inner and outer sides of the electrode structure 1. This allows the airflow to meander along a spiral trajectory as it passes through the inner and outer sides of the electrode structure 1, effectively extending the residence time and reaction distance of the air within the dielectric barrier discharge region. This ensures sufficient and sustained contact and reaction between air pollutants, bacteria, microorganisms, and the active particles of the plasma on both sides, significantly improving the degradation and inactivation efficiency of VOCs, odors, bacteria, and viruses. Furthermore, the spiral-shaped first metal wire 1041 and second metal wire 1051 can disturb the airflow, continuously cutting and disturbing it through the spiral structure, inducing turbulent rotation and enhancing the turbulent mixing effect. This ensures sufficient disturbance of the airflow on both sides of the electrode structure 1, preventing excessively high airflow velocity and further extending the contact time between the airflow and the plasma.

[0071] Specifically, when the electrode structure 1 is in its initial state, the first metal wire 1041 and the second metal wire 1051 can be tilted and set at a predetermined angle with the edge of the electrode structure 1. When the electrode structure 1 is wound into a hollow cylinder, the first metal wire 1041 and the second metal wire 1051 are both set in a spiral shape.

[0072] Of course, in an alternative embodiment, the first metal wire 1041 and the second metal wire 1051 can be circular or straight, respectively, in the working state.

[0073] In one embodiment, the high-voltage electrode 101 is formed by spraying, coating or printing conductive material onto the surface of the first insulating medium 102 or the second insulating medium 103.

[0074] In this embodiment, the high-voltage electrode 101 is formed by spraying, coating, or printing conductive material onto the surface of the first insulating medium 102 or the second insulating medium 103. Therefore, the high-voltage electrode 101 is integrally integrated with the first insulating medium 102 or the second insulating medium 103, ensuring a tight, gapless fit between them. This also guarantees uniform thickness and good conductivity continuity of the high-voltage electrode 101, resulting in a stable high-voltage electric field output without localized electric field distortion. This provides a stable electric field foundation for uniform discharge through the dual-sided dielectric barrier, further enhancing the uniformity and consistency of plasma generation. Simultaneously, the integrated molding process of spraying, coating, and printing is simple and highly compatible, eliminating the need for complex machining and assembly steps such as cutting, stamping, welding, and screw fixing of the high-voltage electrode 101. This significantly simplifies the overall electrode production process, effectively reducing the number of parts, lowering material costs, and reducing manual assembly errors. In addition, the integrated molding structure is lightweight and flexible, which can be adapted to the subsequent bending and winding of electrode structure 1 into various shapes. During the winding or bending process of electrode structure 1, defects such as electrode detachment, cracking, and disconnection are not likely to occur, effectively ensuring the discharge reliability under irregular structure, and taking into account product manufacturability, structural plasticity and long-term working stability.

[0075] In one specific embodiment, the processing of electrode structure 1 is as follows: First, a first conductive wire is printed on one side of the first insulating medium 102 using a screen printing process to serve as a first grounding electrode 104; then, conductive material is formed on the other side of the first insulating medium 102 using a spraying, coating, and printing process to prepare a high-voltage electrode 101; then, a second insulating medium 103 is provided on the side of the high-voltage electrode 101 facing away from the first insulating medium 102; then, a second conductive wire is printed on the side of the second insulating medium 103 facing away from the high-voltage electrode 101 using a screen printing process to serve as a second grounding electrode 105, thus forming a five-layer integrated electrode structure 1.

[0076] In an alternative embodiment, the first insulating medium 102 and the second insulating medium 103 are formed by wrapping an insulating film around the high-voltage electrode 101. The insulating film can be tightly bonded to the high-voltage electrode 101, and the thickness of the first insulating medium 102 and the second insulating medium 103 is consistent, which can ensure that the performance of the first insulating medium 102 and the second insulating medium 103 is consistent and that the insulation performance is stable. This effectively eliminates safety hazards such as local leakage, creepage, and breakdown of the high-voltage electrode 101, meets the insulation requirements of double-sided dielectric barrier discharge, ensures uniform electric field distribution, and further improves the safety and stability of the discharge process. At the same time, the structure formed by wrapping the insulating film is thinner and more flexible, and can be adapted to various shapes by subsequent bending and winding of the electrode structure 1. During the winding or bending process of the electrode structure 1, defects such as electrode detachment, cracking, and disconnection are less likely to occur, effectively ensuring the discharge reliability under irregular structures, and taking into account product manufacturability, structural plasticity, and long-term working stability. Furthermore, the insulating film wrapped around the high-voltage electrode 101 can also prevent moisture and dust in the air from entering the interior of the high-voltage electrode 101, thus avoiding moisture oxidation, dust accumulation and aging of the high-voltage electrode 101, improving the long-term operational stability of the high-voltage electrode 101, and ensuring that the long-term purification performance of the equipment does not decline.

[0077] Specifically, the high voltage electrode 101 can be made of conductive carbon powder or carbon sheet. A first insulating medium 102 and a second insulating medium 103 can be formed on both sides of the high voltage electrode 101 by wrapping a PTFE film around the carbon sheet. Then, a first grounding electrode 104 and a second grounding electrode 105 can be prepared by screen printing conductive materials such as metal or carbon wire on the PTFE film.

[0078] In one embodiment, such as Figure 4 As shown, the electrode structure 1 is a hollow cylinder. A first air flow channel 3 is formed on the inner circumference of the electrode structure 1, and a second air flow channel is formed on the outer circumference of the electrode structure 1. A first grounding electrode 104 is disposed in the first air flow channel 3, and a second grounding electrode 105 is disposed in the second air flow channel.

[0079] In this embodiment, a first airflow channel 3 is formed on the inner periphery of the electrode structure 1, and a second airflow channel is formed on the outer periphery of the electrode structure 1. Both the first airflow channel 3 and the second airflow channel allow air to pass through, so that air purification can be carried out simultaneously on the inner and outer sides of the electrode structure 1. Furthermore, the first airflow channel 3 can limit the airflow direction, prolong the contact time between air and plasma and active particles, completely eliminate the airflow dead zone of traditional single-sided purification, and ensure air purification efficiency.

[0080] In one embodiment, the first grounding electrode 104 is spirally disposed on the inner surface of the first insulating medium 102; the second grounding electrode 105 is spirally disposed on the outer surface of the second insulating medium 103.

[0081] In this embodiment, the first grounding electrode 104 is spirally disposed on the inner surface of the first insulating medium 102, and the second grounding electrode 105 is spirally disposed on the outer surface of the second insulating medium 103. This forms a spiral discharge channel on the inner and outer sides of the electrode structure 1. This allows the airflow to meander along a spiral trajectory as it passes through the first and second air channels on both sides of the electrode structure 1, effectively extending the residence time and reaction distance of the air within the dielectric barrier discharge area. This ensures that air pollutants, bacteria, and microorganisms have sufficient and sustained contact with the plasma active particles on both sides, significantly improving the degradation and inactivation efficiency of VOCs, odors, and bacteria / viruses. Furthermore, the spiral-shaped first and second grounding electrodes 104 and 105 can disturb the airflow, continuously cutting and disturbing it with the spiral structure, inducing turbulent rotation and enhancing the turbulent mixing effect. This ensures sufficient disturbance of the airflow on both sides of the electrode structure 1, preventing excessively high airflow velocity and further extending the contact time between the airflow and the plasma.

[0082] In one embodiment, such as Figure 5 As shown, the first grounding electrode 104 and the second grounding electrode 105 have the same helical direction and pitch, and are offset along the axial direction.

[0083] In this embodiment, the first grounding electrode 104 and the second grounding electrode 105 have the same spiral direction and pitch. The electric field formed by the high-voltage electrode 101 and the first grounding electrode 104 and the second grounding electrode 105 on both sides is the same. The first grounding electrode 104 and the second grounding electrode 105 are staggered along the axial direction to enhance the discharge synergy effect. This can make up for the defects of relatively weak electric field strength and low local plasma concentration in the middle of the two spirals on one side. This allows the strong electric field regions on both sides to fill each other and cross-cover each other, achieving the technical effect of highly uniform electric field strength and stable discharge throughout the entire domain.

[0084] Specifically, during operation, the high-voltage electrode 101 is connected to the high-voltage output terminal of the high-frequency AC power supply (frequency 1-50kHz, voltage 0.5kV-20kV), and the first grounding electrode 104 and the second grounding electrode 105 are connected to the grounding terminal of the high-frequency AC power supply.

[0085] In one specific embodiment, the pitch of the first grounding electrode 104 is 1-10 mm, and the line width is 0.01-3 mm.

[0086] More specifically, electrode structure 1 is a hollow cylindrical shape with a length of 200 mm. The pitch of the first grounding electrode 104 and the second grounding electrode 105 is 3 mm, the line width is 0.1 mm, the inner diameter of the first insulating layer is 2 mm, and the operating frequency of the high-frequency AC power supply is 8 kHz with a voltage of 3.6 kV. Experimental tests show that under an airflow of 300 m³ / h, the formaldehyde removal rate can reach 92.6%, and the ozone generation is controlled below 0.05 ppm, meeting the safety standards for use.

[0087] It should be noted that this embodiment does not limit the specific dimensional parameters of electrode structure 1, which can be set according to actual needs.

[0088] In an alternative embodiment, a combination of pulsed DC and AC excitation can be used to power the high-voltage electrode 101, further improving the yield of active particles and reducing energy consumption.

[0089] According to an embodiment of the present invention, another aspect provides an air purification device, including at least one electrode structure 1 provided in the above embodiment, wherein a high-voltage electrode 101 is connected to the high-voltage terminal of a power supply module, and a first ground electrode 104 and a second ground electrode 105 are connected to the ground terminal of the power supply module.

[0090] In this air purification device, a symmetrical high-voltage electric field is formed between the high-voltage electrode 101 and the first grounding electrode 104 and the second grounding electrode 105 on both sides. The electric field passes through the first insulating medium 102, generating plasma through glow discharge on its surface. The electric field also passes through the second insulating medium 103, generating plasma through glow discharge on its surface, thus forming a double-sided plasma discharge region. Compared with related technologies, the total amount of plasma generated is significantly increased. Furthermore, both the first insulating medium 102 and the second insulating medium 103 can directly contact the flowing air, effectively expanding the contact area between the plasma and the air compared to the single-sided contact structure in related technologies. Because the air can simultaneously receive the action of active particles and plasma on both sides of the electrode structure 1, the degradation and sterilization of pollutants are more complete, significantly improving the overall air purification efficiency.

[0091] Specifically in one embodiment, such as Figure 6 and Figure 7 As shown, multiple electrode structures 1 are provided for synchronous purification. The multiple electrode structures 1 are arranged in two rows, and the two rows of electrode structures 1 are staggered to ensure that the air passes evenly through each electrode structure 1, thereby improving the purification efficiency.

[0092] In one embodiment, such as Figure 8 As shown, the air purification device also includes an air guide structure 2, which is used to make air flow evenly across both sides of the electrode structure 1.

[0093] In this embodiment, by setting the air guide structure 2, it can be ensured that the air flows evenly across both sides of the electrode structure 1, thereby improving the purification efficiency.

[0094] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. An electrode structure, characterized in that, include: High voltage electrode (101); A first insulating medium (102) is disposed on one side of the high-voltage electrode (101); The second insulating medium (103) is disposed on the other side of the high voltage electrode (101); The first grounding electrode (104) is disposed on the side of the first insulating medium (102) away from the high voltage electrode (101); The second grounding electrode (105) is disposed on the side of the second insulating medium (103) away from the high voltage electrode (101), and the second grounding electrode (105) is staggered from the first grounding electrode (104); Both the first insulating medium (102) and the insulating medium are suitable for contact with air.

2. The electrode structure according to claim 1, characterized in that, The electrode structure (1) has an initial processing state in the shape of a flat plate, and a working state after the flat plate is wound or bent.

3. The electrode structure according to claim 2, characterized in that, In the working state, the cross-section of the electrode structure (1) is one of the following: circular, mosquito coil, or wavy.

4. The electrode structure according to claim 2, characterized in that, In the initial processing state, the first grounding electrode (104) includes multiple parallel first metal wires (1041), which are formed on the surface of the first insulating medium (102) by screen printing.

5. The electrode structure according to claim 4, characterized in that, In the initial processing state, the second grounding electrode (105) includes multiple parallel second metal wires (1051), which are formed on the surface of the second insulating medium (103) by screen printing.

6. The electrode structure according to claim 5, characterized in that, In the initial processing state, on the projection plane parallel to the high voltage electrode (101), the second metal wire (1051) is located between two adjacent first metal wires (1041).

7. The electrode structure according to claim 5, characterized in that, In the working state, the cross-section of the electrode structure (1) is circular, and the first metal wire (1041) and the second metal wire (1051) are arranged in a spiral shape.

8. The electrode structure according to any one of claims 1 to 7, characterized in that, The high-voltage electrode (101) is formed by spraying, coating or printing conductive material on the surface of the first insulating medium (102) or the second insulating medium (103).

9. The electrode structure according to any one of claims 1 to 7, characterized in that, The first insulating medium (102) and the second insulating medium (103) are formed by wrapping an insulating film around the high voltage electrode (101).

10. The electrode structure according to claim 1, characterized in that, The electrode structure (1) is in the shape of a hollow cylinder. A first air flow channel (3) is formed on the inner circumference of the electrode structure (1), and a second air flow channel is formed on the outer circumference of the electrode structure (1). The first grounding electrode (104) is disposed in the first air flow channel (3), and the second grounding electrode (105) is disposed in the second air flow channel.

11. The electrode structure according to claim 10, characterized in that, The first grounding electrode (104) is spirally disposed on the inner surface of the first insulating medium (102); The second grounding electrode (105) is spirally disposed on the outer surface of the second insulating medium (103).

12. The electrode structure according to claim 11, characterized in that, The first grounding electrode (104) and the second grounding electrode (105) have the same helical direction and pitch, and are offset along the axial direction.

13. An air purification device, characterized in that, include: At least one electrode structure (1) according to any one of claims 1 to 12, wherein the high voltage electrode (101) is connected to the high voltage terminal of the power supply module, and the first ground electrode (104) and the second ground electrode (105) are connected to the ground terminal of the power supply module.

14. The air purification device according to claim 13, characterized in that, The air purification device also includes an air guide structure (2), which is used to make air flow evenly across both sides of the electrode structure (1).

Images