Dual-electrode plasma processing device and method

Abstract

The invention discloses a dual-electrode plasma processing device and method.The device comprises a plasma generating structure and a control system, the plasma generating structure adopts a dielectric barrier discharge structure, and two electrode metal plates of the dielectric barrier discharge structure are made of different materials and are distributed in a tank body up and down; plasmas generated by materials of the two electrode metal plates are respectively used for disinfection and deodorization; the control system is used for maintaining the distance between the electrode metal plates and the liquid level within a fixed range and the distance between the two electrode metal plates within a fixed range according to distance feedback monitored by the infrared sensor, and the atomizer is in contact with the liquid level; the excitation power supply of the plasma generation structure automatically switches the polarity of the output end according to the overturning state of the tank body. According to the invention, the disinfection and deodorization functions are integrated, the two working modes are flexibly switched, the control is simple, the operation is simple and convenient, and the practicability and multifunctionality of the plasma technology are greatly improved.

Description

Technical Field

[0001] The invention belongs to the field of plasma technology and relates to a dual-electrode plasma processing device and method. Background Art

[0002] As people's living standards improve, they have higher and higher requirements for the hygiene and air quality of their living environment. Pathogenic microorganisms and odor problems have long plagued people's daily lives. Traditional sterilization and deodorization methods, such as chemical disinfectants and activated carbon adsorption, have defects such as limited effectiveness and easy secondary pollution. Therefore, the development of efficient, environmentally friendly and convenient sterilization and deodorization technology has become an urgent problem to be solved.

[0003] Plasma technology has shown broad application prospects in the fields of sterilization and deodorization due to its high efficiency, environmental protection and wide applicability. Plasma is a quasi-neutral ionized gas composed of electrons, ions, atoms, molecules and free radicals formed by gas ionization under the action of an external electric field, which has high reactivity. In particular, the high-voltage electrode material in the plasma generator greatly affects the types of plasma active components, making it suitable for different application scenarios. For example, when metal materials such as copper or silver are used as high-voltage electrodes, the plasma will produce a stronger ionization and excitation process, generating a large number of active particles such as high-energy electrons, active oxygen (O), ozone (O3) and hydroxyl radicals (OH). These active particles can directly destroy the cell membranes and protein structures of microorganisms such as bacteria, viruses and fungi, causing them to be quickly inactivated, thereby achieving efficient sterilization. On the other hand, when titanium / platinum precious metal alloy materials are used as high-voltage electrodes, they are not easily oxidized or corroded. Making them into alloy electrodes can work stably for a long time in a strong oxidizing environment.

[0004] At present, plasma treatment devices mainly use a single-electrode mode, which is mainly suitable for a single scenario. When faced with complex scenarios and multi-functional requirements, it is difficult to switch between different modes, which reduces the convenience of use and limits the application scope of plasma technology. This has limitations for some complex application scenarios. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a dual-electrode plasma treatment device, which integrates the functions of disinfection and deodorization, and has flexible switching between two working modes. It is simple to control and easy to operate, which greatly improves the practicality and versatility of plasma technology and solves the problems existing in the prior art.

[0006] Another object of the present invention is to provide a working method of a dual-electrode plasma processing device.

[0007] The technical solution adopted by the present invention is a dual-electrode plasma treatment device, including a plasma generating structure and a control system. The plasma generating structure adopts a dielectric barrier discharge structure. The materials of the two electrode metal plates of the dielectric barrier discharge structure are different and are distributed up and down in a tank body. The plasma generated by the materials of the two electrode metal plates is used for disinfection and deodorization respectively; a liquid carrier is stored between the two electrode metal plates, an air layer exists between the electrode metal plate located above the liquid surface and the liquid surface, and an atomizer is installed on the side wall of the tank body; an electromagnet adsorption plate is installed on the opposite sides of the two electrode metal plates, and two electromagnets are installed at the top and bottom ends of the tank body for respectively adsorbing the two electromagnet adsorption plates away from each other; The top and bottom of the tank body are both equipped with infrared sensors. The infrared sensor at the top is used to monitor the distance between the electrode metal plate near the top and the top of the tank body, and the distance between the electrode metal plate near the top and the liquid surface; the infrared sensor at the bottom is used to monitor the distance between the electrode metal plate near the bottom and the bottom of the tank body; The control system is used to adjust the magnetic force of the two electromagnets according to the distance feedback monitored by the infrared sensor, and then adjust the relative position of the two electrode metal plates, so that the distance between the electrode metal plates and the liquid surface is maintained within a fixed range, and the distance between the two electrode metal plates is maintained within a fixed range, and the atomizer is in contact with the liquid surface; The excitation power supply of the plasma generating structure adopts a bipolar output, which is used to automatically switch the polarity of the output end according to the flipping state of the tank body.

[0008] Furthermore, an insulating telescopic connecting rod is fixedly connected between the two electrode metal plates. The insulating telescopic connecting rod is perpendicular to the electrode metal plates. An insulating spring is sleeved outside the insulating telescopic connecting rod. Both ends of the insulating spring are respectively connected to the two electrode metal plates.

[0009] Furthermore, the two electrode metal plates are slidably and sealedly connected to the inner wall of the tank body, the insulating telescopic connecting rod is sealedly connected to the two electrode metal plates, and the side wall of the atomizer is sealedly connected to the inner wall of the tank body, providing a closed storage space for the liquid carrier.

[0010] Furthermore, the electrode metal plate located above the liquid surface is connected to the high voltage end of the excitation power supply.

[0011] Furthermore, the control system includes a signal processing unit and a main controller. The signal processing unit is used to preliminarily process the distance information monitored by the infrared sensor. The main controller dynamically adjusts the magnetic force of the electromagnet by controlling the voltage strength or current value of the electromagnet located above according to the real-time feedback of the distance monitored by the infrared sensor, thereby accurately controlling the stretching degree of the insulating spring, and then adjusting the relative position of the two electrode metal plates to achieve dynamic adjustment of the electrode position.

[0012] Furthermore, the distance between the two electrode metal plates is 2-5 cm.

[0013] Furthermore, the excitation power supply includes a high-speed electronic switch and a polarity reversal circuit. The high-speed electronic switch is used to quickly switch high voltage. The control system of the power supply is connected to the attitude sensor module. The attitude sensor module is used to detect the flipping state of the tank in real time and send it to the polarity reversal circuit. The polarity reversal circuit automatically switches the polarity of the output end according to the flipping state of the tank.

[0014] Furthermore, the two electrode metal plates are of a flat plate-tip structure with tiny tip protrusions on the surface, and the height of the protrusions is 50-100 microns.

[0015] Furthermore, the upper electrode metal plate is located one-third to one-fifth of the upper part of the tank body, so that the distance between the two electrode metal plates does not exceed the elastic deformation range of the spring, thereby keeping the lower electrode metal plate below the atomizer, thereby allowing the atomizer to contact the liquid surface.

[0016] A working method of a dual-electrode plasma processing device comprises the following steps: According to the application scenario, it is determined whether the disinfection mode or the deodorization mode needs to be turned on; disinfection mode: flip the device upside down so that the electrode metal plate suitable for disinfection is located at the top; deodorization mode: flip the device upside down so that the electrode metal plate suitable for deodorization is located at the top; High voltage output polarity automatic switching: The control system sends a control signal to the relay module according to the switched working mode; the relay switches the connection relationship between the high-voltage output terminal and the two electrode metal plates according to the control signal, ensuring that the high voltage is always applied to the electrode metal plate located above; Position adjustment of electrode metal plate: The control system reads the distance signals of the two infrared sensors and determines the initial positions of the two electrode metal plates; calculates the distance and direction that each electrode metal plate needs to move according to the preset target position, outputs a PWM signal, controls the power-on duty cycle of the two electromagnets, and generates an electromagnetic suction force that is proportional to the moving distance of the electrode metal plates and inversely proportional to the moving speed, so that the two electrode metal plates move toward the target positions respectively until the infrared sensor detects that the electrode metal plates have reached the target position; Automatic positioning of electrode metal plates: During the discharge process, the control system reads the distance signals of the two infrared sensors in real time, and calculates the deviation between the actual value and the target value of the electrode metal plate position; the position deviation is used as the input of the algorithm to calculate the output electromagnet control signal to achieve closed-loop control of the electrode metal plate position; at the same time, the control system uses the voltage and current signals output by the power supply as feedback to adjust the output parameters of the power supply to achieve dynamic constant control of the plasma intensity; the control system automatically stops the discharge according to the preset time or treatment dose to complete a treatment process.

[0017] The beneficial effects of the present invention are: (1) Dual-electrode metal plate switching: The present invention adopts a unique flip-type dual-mode switching design. By turning the device upside down, it can switch to different combinations of high-electrode discharge materials, so that the system can operate flexibly in two different working modes: disinfection and deodorization. By cleverly utilizing the differences in electrode materials, a simple and quick switch between the two modes is achieved, greatly improving the practicality and versatility of the device.

[0018] (2) Dynamically control the distance between the electrode metal plates and the water surface: By adding infrared sensors to the upper and lower ends of the device, the distance between the two electrode metal plates and the top of the tank is measured in real time, and the connection between the two electrode metal plates is changed to an insulating spring. The system can automatically adjust the electrode spacing according to the flipping state, always maintaining the optimal discharge distance, ensuring that the current can stably break through the air and achieve normal discharge. At the same time, the electromagnet at the high electrode end is energized to ensure that the two-electrode structure is always at the top after flipping, and by fixing the size of the electromagnets at each pole, the liquid (water) surface between the electrodes is always higher than the atomizer to achieve stable spraying. These careful structural designs ensure the stability and reliability of the device at any angle, while also simplifying the user's operation and improving the user experience.

[0019] (3) Environmentally friendly, safe and residue-free: Compared with traditional chemical reagent sprays, the present invention uses clean plasma technology to disinfect and remove odors, leaving no chemical residue and being more environmentally friendly and safe. The high-energy particles generated by the plasma can oxidize and decompose bacteria, viruses and odor molecules in a very short time, achieving fast, efficient and non-toxic cleaning.

[0020] In summary, the present invention can automatically switch the electrode material and polarity of the plasma generator by transposing the tank of the plasma activated water generator, so that the generator can controllably generate two working modes and their active components, which are respectively suitable for typical application scenarios such as sterilization and deodorization. This technology is expected to promote the innovative application of plasma technology in the fields of household appliances, medical disinfection and air purification, and provide a more efficient, environmentally friendly and economical solution to solve microbial contamination and air quality problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0023] Figure 2 These are six views of an application example of an embodiment of the present invention.

[0024] Figure 3 It is a structural schematic diagram of a posture sensor module and a variable current source module in an embodiment of the present invention.

[0025] Figure 4 It is a perspective view of an application example of the embodiment of the present invention.

[0026] Figure 5 It is a work flow chart of an embodiment of the present invention.

[0027] In the figure, 1. first infrared sensor, 6. second infrared sensor, 2. first electrode metal plate, 5. second electrode metal plate, 3. insulating spring, 4. insulating telescopic connecting rod, 7. first electromagnet, 11. second electromagnet, 8. first electromagnet adsorption plate, 10. second electromagnet adsorption plate, 9. atomizer. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] Embodiment 1, A dual-electrode plasma processing device comprises a plasma generating structure, an electromagnet control module, a posture sensor module, a variable power supply module and related circuits.

[0030] like Figure 1As shown, the plasma generating structure adopts a dielectric barrier discharge structure, and a first electrode metal plate 2 and a second electrode metal plate 5 are arranged in the tank body, and the first electrode metal plate 2 and the second electrode metal plate 5 are made of different materials; water is used as a liquid carrier and stored between the first electrode metal plate 2 and the second electrode metal plate 5. The first electrode metal plate 2, the second electrode metal plate 5, and the air layer between the electrodes and the water surface constitute a dielectric barrier discharge structure, and plasma is generated in the air layer between the electrodes (the first electrode metal plate 2 and the second electrode metal plate 5) and the water surface.

[0031] like Figure 1 In the working state shown, the first electrode metal plate 2 is connected to the high voltage electrode, and the second electrode metal plate 5 is the ground electrode; after the tank body is turned upside down, the second electrode metal plate 5 is connected to the high voltage electrode, and the first electrode metal plate 2 is the ground electrode.

[0032] In some embodiments, the first electrode metal plate 2 and the second electrode metal plate 5 are preferably a flat plate-tip structure of different materials to enhance the electric field strength and discharge effect. Specifically, the upper electrode (first electrode metal plate 2) is a flat plate electrode or a metal tip electrode (in the shape of a needle or a spiral spring), and the tip protrusion can concentrate the electric field lines, easily generate ionization discharge, and is conducive to the generation of plasma; the lower electrode (second electrode metal plate 5) is a titanium / platinum noble metal alloy flat plate electrode in the shape of a flat plate or a grid, which increases the surface area and improves the discharge efficiency. The surfaces of the first electrode metal plate 2 and the second electrode metal plate 5 are precisely processed to make a large number of tiny tip protrusions (height 50-100 microns) on the surface of the electrode metal plate. The tip protrusion is conducive to electric field concentration, lowering the discharge threshold, and improving the efficiency of plasma generation.

[0033] Due to the particularity of the structure of the columnar plasma generator, to ensure that it can discharge smoothly, the highest water level needs to be lower than the highest point of the plasma generator's ground electrode (that is, the tank is not full of water), ensuring that part of the plasma generator can be in contact with the air.

[0034] The electromagnet control module includes a first electromagnet 7 and a second electromagnet 11, which are respectively arranged at the upper and lower ends of the tank body (respectively located at the top and the bottom of the tank body), and a first electromagnet adsorption plate 8 and a second electromagnet adsorption plate 10 are respectively installed on the opposite sides of the first electrode metal plate 2 and the second electrode metal plate 5. After the first electromagnet 7 is energized, it adsorbs the first electromagnet adsorption plate 8, so that the first electrode metal plate 2 moves away from the second electrode metal plate 5; after the second electromagnet 11 is energized, it adsorbs the second electromagnet adsorption plate 10, so that the second electrode metal plate 5 moves away from the first electrode metal plate 2. The first electromagnet 7 and the second electromagnet 11 are designed with high-performance permanent magnetic materials and precision coils, and the magnetic force can be accurately controlled by adjusting the input current. The electromagnet model is HMF-2520, and the rated power is 10W. The first electromagnet adsorption plate 8 and the second electromagnet adsorption plate 10 can be made of soft magnetic materials with good magnetic conductivity, such as pure iron, silicon steel, etc. The magnetic pole surface of the electromagnet is aligned parallel to the surface of the adsorption plate (the first electromagnet adsorption plate 8 and the second electromagnet adsorption plate 10), and they are directly adsorbed together by magnetic force.

[0035] The first infrared sensor 1 and the second infrared sensor 6 are respectively installed at the upper and lower ends of the tank body, which are used to monitor the position of the electrode and its distance from the water surface in real time. In the embodiment, the first infrared sensor 1 and the second infrared sensor 6 are respectively fixed on the top and bottom of the tank body, flush with the inner wall, and accurately measure the distance from the electrode to the end of the tank body (electromagnet) by emitting and receiving infrared light; the first infrared sensor 1 measures the distance from the first electrode metal plate 2 near the top to the top of the tank body, and the distance from the first electrode metal plate 2 near the top to the water surface; the second infrared sensor 6 is used to monitor the distance from the second electrode metal plate 5 near the bottom to the bottom of the tank body.

[0036] In some embodiments, the first infrared sensor 1 and the second infrared sensor 6 are of model SHARPGP2Y0A21YK0F, which are highly accurate, waterproof, and can work stably in a humid environment. They continuously monitor the electrode position, especially quickly capturing position changes during the upside-down flipping of the device. The first infrared sensor 1 and the second infrared sensor 6 also have temperature compensation and anti-interference designs to ensure measurement accuracy in different environments.

[0037] The insulating spring 3 and the insulating telescopic connecting rod 4 are used to adjust the electrode spacing and maintain the electrode position. The insulating spring 3 is made of a high-strength, high-voltage resistant elastic material (rubber or resin material), and has good insulation and anti-aging properties. The insulating spring 3 connects the upper and lower electrodes (the first electrode metal plate 2 and the second electrode metal plate 5), and adjusts the electrode spacing through elastic deformation. The insulating telescopic connecting rod 4 is made of a high-voltage resistant insulating material, and is connected to the electrodes at both ends. It can be telescopic in the vertical direction, coordinate the electrode position in the vertical direction, and provide support in the horizontal direction. The insulating telescopic connecting rod 4 is used to fix the insulating spring 3, and the scalability of the auxiliary insulating spring 3 can be adjusted by a fixed axis spring.

[0038] The output ends of the first infrared sensor 1 and the second infrared sensor 6 are connected to the control system, which includes a signal processing unit and a main controller. The measurement data is transmitted to the main controller after preliminary processing by the signal processing unit as an input for feedback control. The main controller adopts a 16-bit MCU and uses MSP430G2553 as the main control chip. The main controller dynamically adjusts the magnetic force of the first electromagnet 7 and the second electromagnet 11 by controlling the voltage intensity (or current value) passed through the first electromagnet 7 and the second electromagnet 11 according to the real-time feedback of the infrared sensor monitoring distance. According to the spring elastic deformation length formula F=KL (F represents magnetic force, K represents the elastic coefficient of the insulating spring 3, and L represents the stretching length of the insulating spring 3), the stretching length of the insulating spring 3 is accurately controlled, and then the relative position of the first electrode metal plate 2 and the second electrode metal plate 5 is adjusted to realize dynamic adjustment of the electrode position and realize closed-loop control.

[0039] The variable power supply module is the excitation power supply of the plasma generating structure. The excitation power supply is connected to the first electrode metal plate 2 and the second electrode metal plate 5. The excitation power supply adopts a bipolar output design, which can automatically adjust the output polarity according to the working mode of the device (upside down posture), so as to realize the flexible switching of the high voltage end and the ground end of the electrode. The excitation power supply includes a high-speed electronic switch and a polarity reversal circuit. The high-speed electronic switch is a known component that can quickly switch high voltage. The control system of the excitation power supply is connected to the posture sensor module. The posture sensor module can detect the flipping state of the tank in real time and send it to the polarity reversal circuit. The polarity reversal circuit automatically switches the polarity of the output end accordingly, changes the high and low electrodes, and completes the switching of the high and low voltage electrodes in milliseconds. The posture sensor module is installed next to the power supply outside the tank and has a small size. In addition, the power supply also has overcurrent protection, overvoltage protection and short circuit protection functions to ensure safety during the electrode switching process.

[0040] When the device is powered on, a strong electric field is formed between the high-voltage electrode and the low-voltage electrode. When the voltage exceeds a certain threshold and the distance between the electrodes is 2-5 cm, the electric field strength reaches the breakdown voltage of the air, causing the air between the electrodes to be ionized, generating plasma, and the plasma jet is ejected outward from the electrode gap, contacts the water surface through the atomizer 9, and forms a mist of charged particles.

[0041] Assume that in the initial state: the first electromagnet 7 is energized and the second electromagnet 11 is not energized. The first electrode metal plate 2 and the first electromagnet adsorption plate 8 are adsorbed by the first electromagnet 7 on the top of the tank body. The first electrode metal plate 2 is connected to the high voltage end of the excitation power supply as a high voltage electrode. The second electrode metal plate 5 is located at the bottom of the tank body due to its own gravity and the tension of the insulating spring 3. The second electrode metal plate 5 is connected to the ground end of the excitation power supply as a ground electrode.

[0042] When the working mode needs to be switched, the tank body is turned upside down by 180°, the second electromagnet 11 is energized, and the first electromagnet 7 is not energized. The second electrode metal plate 5 and the second electromagnet adsorption plate 10 are adsorbed by the second electromagnet 11 on the top of the turned tank body, becoming a high-voltage electrode. The first electrode metal plate 2 is located at the bottom of the new tank body due to its own gravity and the tension of the insulating spring 3, becoming a ground electrode.

[0043] During the entire flipping process, the first infrared sensor 1 and the second infrared sensor 6 continuously monitor the distance change from the two electrode metal plates to the top and bottom of the tank body. The control system adjusts the magnetic force of the first electromagnet 7 and the second electromagnet 11 according to the distance feedback, and then adjusts the relative position of the two electrode metal plates by pulling the insulating spring 3, so that: the distance between the upper electrode metal plate and the water surface is maintained in a fixed range, and the distance between the electrode metal plates is maintained within the optimal discharge range. In this way, the distance between the high-voltage electrode and the water surface and the distance between the two electrodes can be automatically adjusted to the optimal state during the flipping process, and the dynamic constant is ensured to ensure the stable discharge of the plasma. At the same time, by controlling the size of the electromagnet (i.e., fitting and matching the size of the tank body), the upper electrode metal plate is ensured to be anywhere from one-third to one-fifth of the upper part of the tank body, so that the distance between the two electrode metal plates will not exceed the elastic deformation range of the spring, thereby keeping the lower electrode metal plate below the atomizer 9, and thus keeping the water surface in good contact with the atomizer 9 at all times, ensuring the stable ejection of the plasma mist.

[0044] In this system, water is used as a liquid carrier and is stored in a generating tank composed of two electrode metal plates, an atomizer 9 and a tank wall. A vertical guide groove is provided on the inner wall of the tank body, and sliders are provided at the edges of the two electrode metal plates to match the guide grooves. The electrode metal plates slide up and down in the guide rails through the sliders, and sealing rings are provided at both ends of the guide grooves to fit tightly with the outer edges of the electrode metal plates. The sealing ring material can be selected from rubber or silicone with good elasticity and corrosion resistance, and a certain amount of insulating grease is also filled between the electrode metal plates and the tank body, which can reduce friction on the one hand and help seal on the other.

[0045] The connection between the insulating telescopic connecting rod 4 and the electrode metal plate is sealed by an O-ring or a flexible sealing pad to prevent water from leaking from the connection. In addition, elastic sealing structures such as elastic sealing lips or sealing caps are arranged on both end surfaces of the tank body to seal the upper and lower edges of the electrode metal plate.

[0046] The electrode metal plate is limited and guided by the guide rail groove, and supported by the insulating telescopic connecting rod 4, so that the electrode metal plate can move smoothly. At the connection or contact gap between the electrode metal plate and the tank body, multiple sealing measures are taken to ensure that water does not leak, which not only meets the movement requirements of the electrode metal plate, but also provides a closed storage space for water.

[0047] The atomizer 9 is installed in the middle of the tank body. The connection between the atomizer 9 and the tank body is fixed in the form of threads. At the same time, a mounting groove matching the atomizer is opened on the tank body. A stepped sealing structure is designed in the groove, which fits tightly with the step of the atomizer to ensure the sealing between the side wall of the atomizer 9 and the inner wall of the tank body.

[0048] In some embodiments, the first electrode metal plate 2 is made of a copper / silver composite material, and the surface is nickel-plated to increase corrosion resistance; the second electrode metal plate 5 is made of a titanium / platinum precious metal alloy material. In the disinfection mode, the copper electrode will release a large number of high-energy electrons and active particles, such as ozone, hydrogen peroxide, etc., which have strong oxidative sterilization capabilities. In the deodorization mode, the plasma generated by the titanium / platinum alloy electrode is mainly low-energy electrons, and the concentration of active particles is relatively low, which is more suitable for oxidative decomposition of odor molecules.

[0049] The dual-mode switching design of the embodiment of the present invention does not require replacement of electrodes or use of complex control circuits. The seamless switching of working modes can be achieved by simply flipping the device, which is more convenient to operate and more practical. By flipping the device upside down by 180° (i.e., placing it forward and backward), the metal material at the high-voltage electrode end can be switched, and different combinations of high-voltage electrode discharge materials can be used, so that the system can operate in two different working modes.

[0050] The insulating elastic connecting rod 4 is linked with the electromagnet control module to dynamically control the distance between the two electrode metal plates; the variable power supply module (i.e., the excitation power supply) is used to control the current of the electromagnet, and its suction force can be accurately adjusted. The first infrared sensor 1 and the second infrared sensor 6 have a measurement range of about 2-20cm and a resolution of 0.5mm. They measure the distance from the top to the water surface. According to the distance measurement results, the variable power supply module automatically adjusts the current of the electromagnet to dynamically control the position of the electrode metal plate, thereby fixing the distance from the electrode metal plate to the water surface and ensuring the normal occurrence of plasma.

[0051] like Figure 2-4 As shown, the handheld device of the embodiment of the present invention adopts ergonomic design, is a slim cylindrical shape with a length of 20 cm and a diameter of 5 cm, weighs only 498g, and is easy and convenient to operate with one hand. It does not need to add water frequently and can be used continuously for hundreds of times, which is very convenient to use.

[0052] like Figure 3 As shown, the variable power supply module adopts a push-pull resonant circuit, which can realize functions such as wide range voltage and frequency adjustment. According to the positive posture, it is the disinfecting mode, outputting 3kV peak-to-peak voltage and 25kHz frequency, and the negative posture is the deodorization mode, outputting 1.5kV peak-to-peak voltage and 40kHz frequency.

[0053] The attitude sensor module uses a micro-electromechanical accelerometer, 3-axis detection, and a resolution of 0.001g. It monitors the device's tilt angle in real time and automatically switches the working mode once it exceeds 90 degrees. When the mode is switched, the high-voltage parameters are automatically adjusted to the corresponding set values.

[0054] The attitude sensor model is MPU-6050, and the variable power supply model is LT3757. The attitude sensor module can detect the flipping state of the tank in real time and automatically switch the polarity of the output terminal accordingly. The variable power supply module is used to achieve flexible switching of high and low voltage of the electrode.

[0055] The workflow of the embodiment of the present invention is as follows: Figure 5 As shown, when the switch is turned on, the infrared sensor detects the distance from the upper electrode metal plate to the liquid surface and sends a signal to the electromagnet control module; the electromagnet control module controls the magnetic force of the electromagnet and adjusts the distance from the electrode metal plate to the liquid surface to a preset value; the variable power supply module supplies power to the electromagnet control module.

[0056] The attitude sensor module detects the attitude of the tank. If it is in a positive attitude, it inputs low-frequency high voltage and enters the disinfection mode: the top uses a corrosion-resistant copper / silver composite electrode, and the bottom uses a titanium / tantalum precious metal electrode, applying 3kV peak-to-peak and 25kHz low-frequency AC high voltage. The variable power supply module adopts a push-pull resonant circuit to achieve wide-range voltage regulation. The high-energy electrons up to 10eV and a large number of active oxygen ions generated on the electrode surface are mixed with atomized pure water to form a highly effective bactericide. Spraying for 5 seconds can quickly kill more than 99.99% of bacteria within a range of 20cm² and remove more than 99.9% of viruses, meeting the sanitation and disinfection needs of daily tableware, children's toys and other items, far exceeding traditional chemical disinfectants. The whole device is compact in size, inputs a low-frequency high-voltage power supply, and outputs high-energy plasma on the electrode metal plate, which is mixed with water mist and atomized, and has strong practicality.

[0057] If it is a negative posture, input high frequency and low voltage to enter the deodorization mode: the upper part becomes a titanium / platinum electrode, and the lower part becomes a copper / silver electrode. At the same time, the discharge parameters are adjusted to 1.5kV and 40kHz. At this time, ozone and other strong oxidizing substances are enriched on the electrode surface and mixed with atomized water. Spraying for 15 seconds can effectively remove stubborn sweat, smoke and other odors on the fabric surface within a range of 10cm², making the clothes fresh and fragrant. Just flip the sprayer up and down 180°, and the built-in posture sensor module can automatically switch to the deodorization mode.

[0058] The embodiment of the present invention uses two electrode metal plates (first electrode metal plate 2 and second electrode metal plate 5) arranged symmetrically up and down. The two electrode metal plates are made of different materials and are suitable for different working modes. When the device is upright, the upper first electrode metal plate 2 is connected to high voltage, and the lower second electrode metal plate 5 is grounded, which is suitable for disinfection. When the device is inverted, the roles of the upper and lower electrodes are reversed, the original second electrode metal plate 5 is connected to high voltage, and the original first electrode metal plate 2 is grounded, which is suitable for deodorization.

[0059] In the embodiment of the present invention, during the entire flipping process, the first infrared sensor 1 and the second infrared sensor 6 continuously monitor the distance changes from the two electrode metal plates to the top and bottom of the tank body. The control system adjusts the magnetic force of the first electromagnet 7 and the second electromagnet 11 according to the distance feedback, and then adjusts the relative position of the two electrode metal plates by pulling the insulating spring 3, so that: the distance between the upper electrode metal plate and the water surface is maintained in a fixed range, and the distance between the electrode metal plates is maintained within the optimal discharge range, thereby ensuring the efficient generation of plasma during spraying. At the same time, the electromagnet control module and the insulating elastic connecting rod jointly control the electrode spacing, so that the distance from the high-voltage electrode metal plate to the liquid surface is constant, the plasma concentration is stable and controllable, and the overall design ensures safety in use.

[0060] The electrode material of the present invention can adopt the following combinations: stainless steel / nickel alloy: stainless steel has good corrosion resistance, and nickel alloy can improve conductivity and wear resistance. Graphite / carbon nanotube composite material: graphite has good conductivity, and carbon nanotubes can improve mechanical strength and specific surface area. Aluminum / titanium alloy: aluminum is light and has good conductivity, and titanium alloy has excellent corrosion resistance and biocompatibility. Metal electrodes (such as copper, silver, etc.) have excellent conductivity, can reduce the ohmic loss of the electrode, can generate a strong electric field at a lower voltage, and are conducive to the generation of plasma. Titanium / platinum precious metal alloys are not easily oxidized or corroded. They are made into alloy electrodes, which can work stably for a long time in a strong oxidizing environment. The combination of copper / silver composite material electrodes and titanium / platinum precious metal alloy electrodes can take into account conductivity and corrosion resistance and extend the service life of the electrode. The system integrates disinfection and deodorization functions and can be widely used in indoor air purification, scene disinfection, medical disinfection and other fields. Through the differential design of electrode materials and the simple operation of device flipping, the embodiment of the present invention realizes the flexible switching between the two working modes of plasma disinfection and deodorization, greatly improving the practicality and versatility of plasma technology, and has good application prospects and practical value.

[0061] The embodiment of the present invention adopts a high-voltage pulse transformer and an intelligent control circuit. The transformer adopts high-quality ferrite material, which achieves a high step-up ratio and high efficiency in a small size. The control circuit adopts pulse width modulation and feedback control technology, which can accurately adjust the amplitude, frequency and duty cycle of the pulse to ensure the consistency of the pulse waveform. The electromagnet control module adopts a fuzzy control algorithm, which dynamically adjusts the control strategy according to the speed and amplitude of the water level change, ensuring rapid response and stable discharge when the water level changes suddenly.

[0062] Embodiment 2, A working method of a dual-electrode plasma processing device comprises the following steps: According to the application scenario, determine whether to turn on the disinfection mode or the deodorization mode; Disinfection mode: flip the device upside down so that the electrode metal plate suitable for disinfection is located on the top; Deodorization mode: flip the device upside down so that the electrode metal plate suitable for deodorization is located on the top.

[0063] High voltage output polarity automatic switching: The control system sends a control signal to the relay module according to the switched working mode; the relay switches the connection relationship between the high-voltage output terminal and the two electrode metal plates according to the control signal to ensure that the high voltage is always applied to the electrode metal plate located above; the controller adjusts the output voltage and frequency of the power module according to the preset process parameters to generate the required plasma discharge. The variable power module monitors the output current and voltage in real time. When arc discharge or overcurrent is detected, the output is immediately cut off and a fault signal is sent to the controller. After receiving the fault signal, the controller turns off the power output, records the fault information, and automatically tries to restart within the specified time until the fault is eliminated.

[0064] Position adjustment of electrode metal plate: The control system reads the distance signals of the two infrared sensors and determines the initial positions of the two electrode metal plates; calculates the distance and direction that each electrode metal plate needs to move according to the preset target position, outputs a PWM signal, controls the power-on duty cycle of the two electromagnets, and generates an electromagnetic suction force that is proportional to the moving distance of the electrode metal plate and inversely proportional to the moving speed. Under the action of the electromagnetic force and the spring force, the two electrode metal plates move toward the target positions respectively until the infrared sensor detects that the electrode metal plates have reached the target position; the controller continuously monitors the position changes of the two electrode metal plates, and repeats the correction when the position deviates from the target value by more than the set threshold.

[0065] Automatic positioning of electrode metal plates: During the discharge process, the control system reads the distance signals of the two infrared sensors in real time, and calculates the deviation between the actual value and the target value of the electrode metal plate position; the position deviation is used as the input of the algorithm to calculate the output electromagnet control signal to achieve closed-loop control of the electrode metal plate position; at the same time, the control system uses the voltage and current signals output by the power supply as feedback to adjust the output parameters of the power supply to achieve dynamic constant control of the plasma intensity; the control system automatically stops the discharge according to the preset time or treatment dose to complete a treatment process.

[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A dual-electrode plasma processing device, comprising a plasma generating structure and a control system, wherein the plasma generating structure adopts a dielectric barrier discharge structure, characterized in that: The two electrode metal plates of the dielectric barrier discharge structure are made of different materials and are distributed up and down in the tank body, and the plasma generated by the materials of the two electrode metal plates is used for disinfection and deodorization respectively; a liquid carrier is stored between the two electrode metal plates, an air layer exists between the electrode metal plate located above the liquid surface and the liquid surface, and an atomizer (9) is installed on the side wall of the tank body; an electromagnet adsorption plate is installed on the opposite sides of the two electrode metal plates, and two electromagnets are installed at the top and bottom ends of the tank body, which are used to respectively adsorb the two electromagnet adsorption plates away from each other; The top and bottom of the tank body are both equipped with infrared sensors. The infrared sensor at the top is used to monitor the distance between the electrode metal plate near the top and the top of the tank body, and the distance between the electrode metal plate near the top and the liquid surface; the infrared sensor at the bottom is used to monitor the distance between the electrode metal plate near the bottom and the bottom of the tank body; The control system is used to adjust the magnetic force of the two electromagnets according to the distance feedback monitored by the infrared sensor, and then adjust the relative position of the two electrode metal plates, so that the distance between the electrode metal plates and the liquid surface is maintained within a fixed range, and the distance between the two electrode metal plates is maintained within a fixed range, and the atomizer (9) is in contact with the liquid surface; The excitation power supply of the plasma generating structure adopts a bipolar output, which is used to automatically switch the polarity of the output end according to the flipping state of the tank body.

2. A dual-electrode plasma processing device according to claim 1, characterized in that: An insulating telescopic connecting rod (4) is fixedly connected between the two electrode metal plates. The insulating telescopic connecting rod (4) is perpendicular to the electrode metal plates. An insulating spring (3) is sleeved outside the insulating telescopic connecting rod (4). Both ends of the insulating spring (3) are respectively connected to the two electrode metal plates.

3. A dual-electrode plasma processing device according to claim 2, characterized in that: The two electrode metal plates are slidably and hermetically connected to the inner wall of the tank body, the insulating telescopic connecting rod (4) is hermetically connected to the two electrode metal plates, and the side wall of the atomizer (9) is hermetically connected to the inner wall of the tank body, thereby providing a closed storage space for the liquid carrier.

4. A dual-electrode plasma processing device according to claim 1, characterized in that: The electrode metal plate located above the liquid surface is connected to the high voltage end of the excitation power supply.

5. A dual-electrode plasma processing device according to claim 2, characterized in that: The control system comprises a signal processing unit and a main controller. The signal processing unit is used to preliminarily process the distance information monitored by the infrared sensor. The main controller dynamically adjusts the magnetic force of the electromagnet by controlling the voltage intensity or current value of the electromagnet located above according to the real-time feedback of the distance monitored by the infrared sensor, thereby accurately controlling the stretching degree of the insulating spring (3), and further adjusting the relative position of the two electrode metal plates, thereby realizing dynamic adjustment of the electrode position.

6. A dual-electrode plasma processing device according to claim 1, characterized in that: The distance between the two electrode metal plates is 2-5 cm.

7. A dual-electrode plasma processing device according to claim 1, characterized in that: The excitation power supply includes a high-speed electronic switch and a polarity reversal circuit. The high-speed electronic switch is used to quickly switch high voltage. The control system of the power supply is connected to the attitude sensor module. The attitude sensor module is used to detect the flipping state of the tank in real time and send it to the polarity reversal circuit. The polarity reversal circuit automatically switches the polarity of the output end according to the flipping state of the tank.

8. A dual-electrode plasma processing device according to claim 1, characterized in that: The two electrode metal plates are of a flat plate-tip structure, with tiny tip protrusions on the surface, and the height of the protrusions is 50-100 microns.

9. A dual-electrode plasma processing device according to claim 2, characterized in that: The upper electrode metal plate is located between one third and one fifth of the upper portion of the tank body, so that the distance between the two electrode metal plates does not exceed the elastic deformation range of the spring, thereby keeping the lower electrode metal plate below the atomizer (9), thereby allowing the atomizer (9) to contact the liquid surface.

10. A working method of a dual-electrode plasma processing device as claimed in claim 1, characterized in that: The following steps are involved: According to the application scenario, it is determined whether the disinfection mode or the deodorization mode needs to be turned on; disinfection mode: flip the device upside down so that the electrode metal plate suitable for disinfection is located at the top; deodorization mode: flip the device upside down so that the electrode metal plate suitable for deodorization is located at the top; High voltage output polarity automatic switching: The control system sends a control signal to the relay module according to the switched working mode; the relay switches the connection relationship between the high-voltage output terminal and the two electrode metal plates according to the control signal, ensuring that the high voltage is always applied to the electrode metal plate located above; Position adjustment of electrode metal plate: The control system reads the distance signals of the two infrared sensors and determines the initial positions of the two electrode metal plates; The distance and direction that each electrode metal plate needs to move is calculated according to the preset target position, and a PWM signal is output to control the power-on duty cycle of the two electromagnets, thereby generating an electromagnetic suction force that is proportional to the moving distance of the electrode metal plate and inversely proportional to the moving speed, so that the two electrode metal plates move toward the target position respectively until the infrared sensor detects that the electrode metal plate has reached the target position; Automatic positioning of electrode metal plates: During the discharge process, the control system reads the distance signals of the two infrared sensors in real time, and calculates the deviation between the actual value and the target value of the electrode metal plate position; the position deviation is used as the input of the algorithm to calculate the output electromagnet control signal to achieve closed-loop control of the electrode metal plate position; at the same time, the control system uses the voltage and current signals output by the power supply as feedback to adjust the output parameters of the power supply to achieve dynamic constant control of the plasma intensity; the control system automatically stops the discharge according to the preset time or treatment dose to complete a treatment process.

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