Plasma air decontamination device and method

Abstract

The application discloses a kind of plasma air disinfection device and method, air disinfection device includes cylindrical plasma generator, uniformly distributed in water storage chamber, for ionizing mixed gas to generate plasma, and to water solution is activated once;Water storage chamber is equipped with porous water-absorbing stick, and the center of porous water-absorbing stick is contacted with sheet-shaped plasma generator, and activated water solution is transported to sheet-shaped plasma generator to be activated twice and realize nanometer atomization;Cylindrical plasma generator, sheet-shaped plasma generator are connected system control module, for according to active ingredient in current water solution, concentration and the active ingredient, concentration required in spray, control first activation voltage, first activation time, and secondary activation voltage and secondary activation time.The application can realize effective air disinfection in a variety of scene environments, and air disinfection effect and environmental adaptability are considered, and use safety and convenience are improved.

Description

Technical Field

[0001] This invention belongs to the field of plasma technology and relates to a plasma air disinfection device and method. Background Technology

[0002] Air disinfection technologies vary in their effectiveness at killing microorganisms and often need to be used in combination for optimal results. Ultraviolet disinfection, reactive oxygen species disinfection, and electronic sterilization are common methods. It is important to emphasize that these technologies typically require professional operation, and should be used under the guidance of a qualified professional in the home.

[0003] Plasma technology, with its high-energy particles and free radicals, is considered a rapid, effective, and environmentally friendly air disinfection technology with broad application prospects. However, some limitations exist in practical applications:

[0004] (1) Lack of ability to regulate active substances: Existing plasma technology has difficulty in precisely controlling the composition and concentration of generated active substances. In different scenarios, it is usually necessary to adjust the combination of active substances for different microorganisms, but existing technology cannot achieve such precise regulation. For example, in hospital air disinfection, bacteria, viruses and fungi have different sensitivities to active substances. Some viruses may be more sensitive to high concentrations of ozone, while some bacteria may require more reactive oxygen free radicals to be killed.

[0005] (2) Inefficient energy consumption: Plasma air disinfection technology requires the generation of plasma areas with positive and negative ions. The process of generating plasma requires high-voltage discharge through a high-voltage power supply. Most existing plasma disinfection products have high voltage requirements, usually requiring a high-voltage power supply of more than 10 KV to generate an effective plasma disinfection area. Therefore, the power consumption for disinfection is relatively large.

[0006] (3) Limited effective contact area: During the disinfection process, plasma needs to effectively contact microorganisms in the air. However, existing technologies cannot release enough plasma when there are complex factors such as air flow and confluence, which limits the effective disinfection area of ​​the plasma. Summary of the Invention

[0007] To address the aforementioned issues, this invention provides a plasma air disinfection device that can convert natural water into plasma-activated water with disinfection effects. The plasma-activated water is then diffused into the air in the form of aerosol, achieving effective air disinfection in various scenarios. This device balances air disinfection effectiveness with environmental adaptability, while also improving safety and convenience, thus resolving the problems existing in the prior art.

[0008] Another objective of this invention is to provide a plasma air disinfection method.

[0009] The technical solution adopted in this invention is a plasma air disinfection device, including a columnar plasma generator, which is uniformly distributed in a water storage chamber and is used to ionize mixed gas to generate plasma and to perform primary activation of the aqueous solution.

[0010] The water storage chamber is equipped with a porous water-absorbing rod, which is in contact with the center of the sheet plasma generator to transport the activated aqueous solution to the sheet plasma generator for secondary activation and to achieve nanoscale atomization.

[0011] Both the columnar plasma generator and the sheet plasma generator are connected to the system control module, which is used to control the primary activation voltage and primary activation time, as well as the secondary activation voltage and secondary activation time, based on the active ingredients and concentrations in the current aqueous solution and the required active ingredients and concentrations in the spray.

[0012] Furthermore, a conductivity detection module is installed in the water storage chamber to detect the concentration of charged ions in the aqueous solution within the water storage chamber and transmit the data to the system control module.

[0013] Furthermore, the columnar plasma generator includes a hollow cylindrical dielectric layer, the interior of which is filled with a high-voltage metal electrode. A metal base is installed at the bottom of the columnar plasma generator. A ground electrode located on the outer wall of the dielectric layer is connected to the metal base. The highest water level in the water storage chamber is lower than the highest point of the ground electrode, so that a part of the ground electrode is in contact with the gas in the water storage chamber.

[0014] Furthermore, the sheet-like plasma generator includes a hollow annular piezoelectric ceramic ring, which serves as an insulating dielectric layer. A metal ring is attached to the end of the piezoelectric ceramic ring near the columnar plasma generator. A porous metal sheet is provided in the hollow part of the piezoelectric ceramic ring, and the axial distance between the metal ring and the porous metal sheet is 2mm-5mm. The inner diameter of the piezoelectric ceramic ring is smaller than the inner diameter of the metal ring, and the difference between the inner diameters of the metal ring and the piezoelectric ceramic ring is 2mm-5mm.

[0015] The piezoelectric ceramic ring is connected to a sinusoidal or pulsed high-voltage excitation circuit with rapidly changing amplitude. This allows the sheet plasma generator to produce plasma for secondary activation, while the piezoelectric ceramic ring, affected by voltage changes, drives the porous metal sheet to vibrate at high speed, achieving nanoscale atomization.

[0016] Furthermore, the piezoelectric ceramic ring has a thickness of 1-2 mm, and the porous metal sheet has a thickness of 0.2-0.4 mm and a pore size of 5-10 μm.

[0017] Furthermore, the end of the porous absorbent rod passes through the center of the metal ring and the piezoelectric ceramic ring and is closely attached to the porous metal sheet.

[0018] Furthermore, the air inlet of the water storage chamber is connected to the air chamber through an air guide pipe. Multiple air cylinders are installed in the air chamber, each containing a different gas. Each air cylinder has an air valve installed at its port to control the opening and closing degree of different air valves, thereby delivering the mixed gas of different components to the water storage chamber.

[0019] Furthermore, a gas pre-ionization module is installed at the air inlet of the water storage chamber to charge the mixed gas and initially change the conductivity of the solution by dissolving the gas in the water.

[0020] Furthermore, the top cover and body of the water storage chamber are connected by threads, and the plate plasma generator is installed on the top cover of the water storage chamber; a base is provided below the water storage chamber, the system control module is installed in the base, and the bottom of the base is provided with heat dissipation vents and multiple support pads.

[0021] A plasma air disinfection method includes the following steps:

[0022] S1, according to the needs of the scenario, introduce the corresponding mixed gas or pre-ionized mixed gas into the water storage chamber, and the columnar plasma generator ionizes the mixed gas to generate plasma, which activates the aqueous solution once.

[0023] S2, the first-activated aqueous solution rises along the porous water-absorbing rod to the sheet plasma generator for secondary activation and nano-level atomization;

[0024] During the primary and secondary activation processes, the system control module controls the primary activation voltage and time, as well as the secondary activation voltage and time, based on the active ingredients and concentrations in the current aqueous solution and the required active ingredients and concentrations in the spray, so that the qualified secondary activated solution diffuses into the air in the form of aerosol.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. In this invention, the plasma activation of water and the spraying process are respectively set as primary activation and secondary activation, and the two processes are coupled together. Furthermore, the piezoelectric ceramic ring is designed as a hollow ring. When the piezoelectric ceramic ring is excited by a rapidly changing sinusoidal or pulsed high voltage, it will drive the porous metal disc in the center to vibrate at high speed. This vibration can convert the activated water into a nano-sized mist, which improves the disinfection efficiency. At the same time, the piezoelectric ceramic ring is used as a dielectric layer in the plasma generator. Multiple ingenious designs effectively improve the integration level of the device.

[0027] 2. By detecting and controlling the liquid conductivity, combined with the system control module, this invention can achieve the goal of controlling different activation components and different solution concentrations under different conditions, and rationally control the time and voltage of primary and secondary plasma activation. It achieves higher excitation power consumption in the early stage of activation and lower excitation power consumption in the later stage, thereby significantly reducing the overall energy consumption.

[0028] 3. The plasma generator of this invention is located entirely inside the device and is not affected by the external environment; by changing the type of working gas through an external gas chamber, the active components of the plasma mist can be effectively controlled to meet different application needs, such as medical, food processing, and air purification; thus providing a highly efficient and energy-saving new solution for modern air disinfection technology. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a perspective view of the overall structure of the device according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic cross-sectional view of the device according to an embodiment of the present invention.

[0032] Figure 3 This is a schematic diagram of the overall bottom surface of the device according to an embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the overall columnar plasma generator according to an embodiment of the present invention.

[0034] Figure 5 This is a schematic cross-sectional view of the columnar plasma generator according to an embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram of the sheet plasma generator according to an embodiment of the present invention.

[0036] Figure 7 This is a schematic cross-sectional view of the piezoelectric ceramic atomizing sheet according to an embodiment of the present invention.

[0037] Figure 8 This is an overall schematic diagram of the device with an external air chamber in an embodiment of the present invention.

[0038] In the diagram: 1. Columnar plasma generator; 2. Sheet plasma generator; 3. Base; 4. Heat dissipation port; 5. Supporting feet; 6. Porous water-absorbing rod; 7. Ground electrode; 8. Dielectric layer; 9. Metal base; 10. High-voltage electrode; 11. Metal ring; 12. Piezoelectric ceramic ring; 13. Porous metal sheet; 14. Water storage chamber; 15. Air inlet; 16. Gas guide pipe; 17. Gas chamber; 18. Gas cylinder; 19. Gas valve; 20. Conductivity detection module; 21. System control module; 22. Gas pre-ionization module. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] Example 1

[0041] A plasma air disinfection device includes a columnar plasma generator 1, a sheet-like plasma generator 2, a system control module 21, a conductivity detection module 20, a porous water-absorbing rod 6, a water storage chamber 14, a power supply, and a control circuit.

[0042] like Figure 1-2 As shown, columnar plasma generators 1 are evenly distributed and installed in the water storage chamber 14, which facilitates the uniform activation of the aqueous solution. A base 3 is provided below the water storage chamber 14, and a conductivity detection module 20 is installed at the bottom of the water storage chamber 14 above the base 3 to detect the concentration of charged ions in the aqueous solution.

[0043] The columnar plasma generator 1 ionizes the mixed gas to generate plasma and activates the aqueous solution once. The system control module 21 calculates and controls the activation time and the applied voltage based on the active ingredients and concentration in the current aqueous solution and the preset target parameters (such as the active ingredients and concentration required in the spray).

[0044] A sheet plasma generator 2 is installed on the top of the water storage chamber 14. A porous water-absorbing rod 6 is installed inside the water storage chamber 14, connecting the bottom of the water storage chamber 14 and the sheet plasma generator 2, which facilitates the rapid transport of the primary activated aqueous solution to the sheet plasma generator 2 for secondary activation.

[0045] In some embodiments, the top cover and body of the water storage chamber 14 are connected by threads, and the sheet plasma generator 2 is installed on the top cover of the water storage chamber 14.

[0046] like Figure 3As shown, the bottom of the base 3 is provided with a heat dissipation vent 4 and multiple support feet 5.

[0047] like Figure 4-5 As shown, the columnar plasma generator 1 includes a hollow cylindrical dielectric layer 8 made of ceramic or glass. The interior of the dielectric layer 8 is filled with metal (either in the form of thin metal sheets attached to the inner wall or tightly fitted metal rods) serving as a high-voltage electrode 10. A number of strip-shaped metals are attached to the exterior of the dielectric layer 8 and connected to a metal base 9 as a ground electrode 7. The columnar plasma generator 1 uses dielectric barrier discharge (DBD) technology to perform a primary activation treatment on the aqueous solution in the water storage chamber 14. The activated aqueous solution contains a certain concentration of active charged particles, altering the conductivity of the solution. It is important to note that to ensure successful discharge of the columnar plasma generator 1, the maximum water level in the water storage chamber 14 must be lower than the highest point of the ground electrode 7, ensuring that a portion of the columnar plasma generator 1 can contact the gas inside the water storage chamber 14.

[0048] like Figure 6-7 As shown, the sheet plasma generator 2 includes a hollow annular piezoelectric ceramic ring 12, which serves as an insulating dielectric layer. A metal ring 11 is attached to the lower part of the piezoelectric ceramic ring 12, and a porous metal sheet 13 is provided in the hollow part of the piezoelectric ceramic ring 12. When the sheet plasma generator 2 is excited by a rapidly changing sinusoidal or pulsed high voltage to generate plasma, the piezoelectric ceramic ring 12 is affected by the voltage change, which drives the porous metal sheet 13 in the center to vibrate at high speed, realizing nanoscale atomization, and thus converting activated water into a mist that diffuses more efficiently into the air.

[0049] The piezoelectric ceramic ring 12 and the metal ring 11 constitute an ultrasonic atomizing sheet. Based on this sheet, the porous metal sheet 13 forms a plasma generator. The porous metal sheet 13 serves as the ground electrode of the sheet-like plasma generator 2, and the metal ring 11 serves as the high-voltage electrode. The distance between the metal ring 11 and the porous metal sheet 13 is 2mm-5mm. Too close a distance will cause arcing, leading to a rapid local temperature rise, which is detrimental to system stability; too far a distance will prevent plasma generation.

[0050] In some embodiments, the inner diameter of the piezoelectric ceramic ring 12 is smaller than the inner diameter of the metal ring 11. If the inner diameter of the metal ring 11 is less than or equal to the inner diameter of the piezoelectric ceramic ring 12, the distance between the metal ring 11 and the porous metal sheet 13 will be too close, resulting in arc discharge. If the inner diameter of the metal ring 11 is r1 and the inner diameter of the piezoelectric ceramic ring 12 is r2, then 5mm > r1 - r2 > 2mm. The reason is that too close a distance will cause arc discharge between the metal ring 11 and the porous metal sheet 13, while too far a distance will prevent the generation of plasma.

[0051] The top of the porous water-absorbing rod 6 penetrates the center of the metal ring 11 and the piezoelectric ceramic ring 12 and is in close contact with the porous metal sheet 13. Due to the siphon effect, the porous water-absorbing rod 6 attracts the primary activated water in the water storage chamber 14 and moves it upward to the sheet-like plasma generator 2. During the operation of the device, the piezoelectric ceramic ring 12 in the sheet-like plasma generator 2 is driven by the circuit to generate vibration at the operating frequency, which ranges from a few kHz to hundreds of MHz, depending on the specific characteristics of the piezoelectric ceramic ring 12. In this embodiment of the invention, the optimal frequency for driving the piezoelectric ceramic ring 12 is automatically detected by the piezoelectric ceramic driving chip DRV2700. When voltage is applied to the piezoelectric ceramic ring 12, it vibrates rapidly, which in turn drives the porous metal sheet 13 in the center to vibrate. As the porous metal sheet 13 vibrates, the liquid near the holes is broken into a mist and diffuses to the outside.

[0052] The thickness of the piezoelectric ceramic ring 12 is 1-2 mm. If it is too thick, its resonant frequency will decrease, which will affect the atomization efficiency. It may also increase the rigidity of the material, reduce the vibration amplitude, and reduce the amount of atomization. If it is too thin, although it can increase the resonant frequency, it will lead to insufficient structural strength and damage under long-term operation or high-intensity vibration.

[0053] The porous metal sheet 13 has a thickness of 0.2-0.4 mm and a pore size of 5-10 μm. If it is too thick, it will lead to insufficient vibration transmission, reducing atomization efficiency and volume. If it is too thin, it will result in insufficient structural strength and be easily damaged during long-term use. If the pore size is too small, it will lead to a decrease in atomization efficiency, increase the power consumption and wear of the atomizer; if the pore size is too large, it will produce larger mist particles, which is not suitable for specific application requirements.

[0054] The liquid generated by the columnar plasma generator 1 is called primary plasma activated water, which serves as preparation for secondary activation and subsequent atomization of the solution. After the aqueous solution completes its initial activation and is transferred through the porous absorbent rod 6, the sheet-like plasma generator 2 comes into contact with the primary plasma activated water and performs a secondary discharge, transforming it into secondary plasma activated water with stronger disinfection capabilities. Next, a piezoelectric ceramic ring 12 driven by a specific frequency voltage atomizes the activated water through high-frequency vibration, forming the final nanoscale plasma active mist. This mist can float in the air, allowing the active substances to easily adhere to the surfaces of various irregular objects and particles using the liquid's adsorption properties, thus achieving air disinfection and 360° thorough disinfection of objects, improving disinfection efficiency. The combination of the two plasma generators enables the system to perform more comprehensive and precise aqueous solution treatment. This multi-stage treatment method improves the system's flexibility and efficiency, allowing it to adapt to different treatment needs and application scenarios.

[0055] The conductivity detection module 20 is positioned above the base 3 and connected to the system control module 21. The system control module 21 is a control system designed with the STM32 microcontroller as its core, and it is installed in the base 3. The conductivity detection module 20 consists of a working electrode and a reference electrode, and its surface is coated with a special coating (which can be platinum, gold, graphite, or oxide coating) to improve its responsiveness and stability. When the two electrodes are immersed in an aqueous solution, the working electrode interacts with the active components in the aqueous solution to detect changes in conductivity in the solution; while the reference electrode provides a constant potential for comparison, making the conductivity measurement more stable and accurate.

[0056] The conductivity detection module 20 has a built-in circuit board for measuring conductivity (i.e., detecting the concentration of charged ions in an aqueous solution) and converting it into a readable electrical signal, which is connected to the system control module 21. It is configured with a power interface and a data output interface to enable communication and data transmission with external devices.

[0057] The system control module 21 is used to receive the user-preset parameters of the required solution volume and concentration of active ingredients. By controlling the internal model of the system (low-temperature plasma fluid model, particle model or hybrid simulation method), it calculates the conductivity, primary activation voltage, primary activation time, secondary activation voltage and secondary activation time of the set aqueous solution after primary activation based on the preset data, the active ingredients and concentration in the current aqueous solution.

[0058] The sheet plasma generator 2 provides a more refined process. By changing the voltage and discharge time applied to the sheet plasma generator 2, the type and concentration of products can be adjusted to meet the requirements of the final application.

[0059] In the initial stage of primary activation, the required discharge voltage is relatively high due to the weak conductivity of the aqueous solution. As the activation process progresses, the ion concentration in the liquid gradually increases, the conductivity of the aqueous solution gradually improves, and the discharge voltage can be appropriately reduced. When the plasma concentration set for primary activation by the system is reached, based on capillary principle, the aqueous solution is transferred to the secondary activation section of the sheet plasma generator 2 through the porous absorber 6. Based on the current active ingredient and concentration in the aqueous solution and the data of the active ingredient and concentration in the preset desired spray, the activation time and discharge voltage of the sheet plasma generator 2 are calculated and controlled. The conductivity of the aqueous solution is controlled by adjusting the discharge voltage applied to the columnar plasma generator 1. This method achieves the goal of controlling the required activation ingredients and solution concentrations under different conditions.

[0060] The conductivity detection module 20 is from Hach's dqh series, featuring multi-parameter testing capabilities, an intelligent probe, high-precision measurement, data management, and connectivity. The conductivity detection module 20 monitors the concentration of charged ions in the aqueous solution. Subsequently, the primary activated aqueous solution rises along the porous absorbent rod 6 to the sheet plasma generator 2, undergoing secondary activation. By adjusting the discharge voltage and the secondary activation time, the composition and concentration of active ingredients in the spray are controlled, generating a secondary activated solution, which is then diffused into the air in the form of an aerosol.

[0061] Traditional plasma generators maintain a relatively constant excitation power consumption throughout the activation process, making them inefficient in terms of energy consumption. This invention features two generators: one inside a water storage chamber 14 and the other at the nozzle. The liquid in these two chambers is interconnected via a porous suction rod 6. During operation, the liquid in the water storage chamber 14 is first converted into a more conductive primary activation liquid under a higher excitation voltage. This activated liquid is then transferred to the generator at the nozzle via the porous suction rod 6, where it undergoes secondary activation at a lower excitation voltage, forming a mist that is released into the air. Multiple columnar plasma generators 1 are located at the bottom of the water storage chamber 14, with their ground electrodes 7 in direct contact with the water; the liquid water can be considered the ground electrode portion of the generator. In the initial stage of the activation process, the required breakdown voltage is relatively high due to the weak conductivity of pure water. However, as the activation process progresses, the concentration of charged particles in the liquid gradually increases, increasing the liquid's conductivity and thus reducing the required excitation voltage. This invention achieves higher excitation power consumption in the early stages of activation and lower excitation power consumption in the later stages through a dual activation process, thereby reducing overall energy consumption.

[0062] Traditional activation requires 6 minutes of generator discharge. At the start of discharge, using pure water as the ground electrode, the required excitation power is 10W. After 2 minutes, due to the increased conductivity of the aqueous solution, the required excitation power drops to 6W. Traditional activation maintains an excitation power of 10W throughout, consuming 10W × 6min = 3600J of energy. In this embodiment, if the power consumption is reduced to 6W in the last minute, the energy consumed is 10W × 2min + 6W × 4min = 2640J, which is 73% of the original energy consumption. However, traditional devices struggle to change the generator's excitation voltage at different times. This embodiment cleverly uses two generators that work together, effectively reducing the energy required for complete activation of an equal volume of liquid. Compared to traditional plasma activation technology, this embodiment achieves better activation results, longer activated water storage time, and better energy utilization efficiency. The entire device only requires tap water for environmental disinfection during operation, without the need for any chemical disinfectants or additives. This method is not only environmentally friendly and safe but also low-cost, producing no harmful residues or side effects.

[0063] Example 2:

[0064] like Figure 8 As shown, the air inlet 15 above the side wall of the water storage chamber 14 is connected to the gas chamber 17 through the air guide pipe 16. Multiple gas cylinders 18 are installed in the gas chamber 17, and each gas cylinder 18 contains a different gas. In this embodiment, the three gas cylinders 18 contain air, oxygen and nitrogen respectively. Each gas cylinder 18 has a gas valve 19 installed at its port, and a gas pre-ionization module 22 is installed on the air guide pipe 16.

[0065] The gas supply system of the device consists of the gas pipe 16, the gas chamber 17, the gas cylinder 18 and the gas valve 19. There are multiple gas cylinders 18 in the gas chamber 17. By adjusting the opening and closing degree of the gas valve 19 corresponding to different gas cylinders 18, a mixed gas of different components is obtained in the gas chamber 17. The mixed gas of different components is then transported to the water storage chamber 14 to change the gas environment in the device and thus affect the plasma discharge products.

[0066] In this embodiment of the invention, the gas environment during the reaction is controlled by an external gas chamber 17. For example, by increasing the proportion of oxygen in the gas collection, the proportion of oxides such as ozone generated during the reaction is increased; or by increasing the proportion of nitrogen in the gas collection, the proportion of nitrogen oxides in the product is increased, thus adapting to the disinfection needs of different scenarios and taking into account both air disinfection effectiveness and environmental adaptability.

[0067] Before the gas enters the device, if the calculated required conductivity of the solution after primary activation is high, the gas pre-ionization module 22 is activated to ionize the mixed gas into charged gas, which is then introduced into the device. Part of the charged gas contacts the aqueous solution, increasing its conductivity; the remaining charged gas is ionized by the columnar plasma generator 1 to generate plasma. These two processes work together to regulate the solution's conductivity. If the calculated required conductivity of the solution after primary activation is low, the gas pre-ionization module 22 is not activated, and the mixed gas is directly introduced into the device.

[0068] Example 3,

[0069] A plasma air disinfection method includes the following steps:

[0070] S1, the gas cylinder 18 is controlled by the gas valve 19 to introduce mixed gas of different compositions or pre-ionized mixed gas of different compositions into the water storage chamber 14. The columnar plasma generator 1 ionizes the mixed gas to generate plasma, which activates the aqueous solution once. Among them, part of the pre-ionized mixed gas is ionized by the columnar plasma generator 1 to generate plasma, which activates the aqueous solution once. Part of the pre-ionized mixed gas dissolves in the water to initially change the conductivity of the solution.

[0071] S2, the first activated aqueous solution rises along the porous water-absorbing rod 6 to the sheet plasma generator 2 for secondary activation and nano-level atomization;

[0072] During the primary and secondary activation processes, the conductivity detection module 20 is used to monitor the concentration of charged ions in the aqueous solution. The system control module 21 controls the primary activation voltage and primary activation time, as well as the secondary activation voltage and secondary activation time, based on the active ingredients and concentrations in the current aqueous solution and the required active ingredients and concentrations in the spray, so that the qualified secondary activated solution diffuses into the air in the form of aerosol.

[0073] Technical effectiveness verification:

[0074] For example, the user requires a liquid volume of 3L and an O3 concentration of 100 mM in the water spray.

[0075] Traditional activated water devices can directly process 3L at a time, with a processing voltage of 15 kV and a processing time of 10 minutes, resulting in high energy consumption.

[0076] The embodiments of the present invention can calculate the optimal treatment scheme based on volume, concentration, and conductivity:

[0077] The first scenario involves no pretreatment. The activation voltage is 15kV, and the treatment time is 5 minutes. The activation occurs when the conductivity reaches 2×10⁻⁶. -5 At a flow rate of S / cm, the liquid is transferred to the secondary activation stage via a water-absorbing rod. The voltage and time for the secondary activation are 8 kV and 10 s, respectively. The energy consumption of the entire process is significantly lower than that of traditional devices.

[0078] The second scenario involves pre-introducing charged gas through the gas pre-ionization module 22, thereby achieving an initial water conductivity of 1×10⁻⁶. -5 The conductivity was measured to be S / cm, followed by an activation process at a voltage of 10 kV for 5 minutes. The activation was continued until the conductivity reached 2 × 10⁻⁶ kV. -5 At a flow rate of S / cm, the liquid is transferred to the sheet plasma generator 2 via the porous absorbent rod 6. The voltage and time for secondary activation are 8 kV and 10 s, respectively. The energy consumption of the entire process is reduced again.

[0079] In this embodiment of the invention, the plasma generator and the atomizing structure are an integrated unit with interconnected functions. Plasma generation and atomization are simultaneous processes, achieving better results compared to generating water mist first and then activating the plasma, or generating plasma to activate water first and then atomizing. The generated plasma-activated aerosol has a higher concentration of active particles, resulting in a stronger disinfection effect. This embodiment of the invention saves energy through secondary activation while achieving the goal of controlling the required activation components and solution concentrations under different conditions, thereby achieving plasma air disinfection effects adaptable to various environments.

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A plasma air disinfection device, comprising a columnar plasma generator (1), characterized in that, The columnar plasma generator (1) is uniformly distributed in the water storage chamber (14) and is used to ionize the mixed gas to generate plasma and to activate the aqueous solution once. The water storage chamber (14) is equipped with a porous water-absorbing rod (6), which is in contact with the center of the sheet plasma generator (2) to transport the activated aqueous solution to the sheet plasma generator (2) for secondary activation and to achieve nanoscale atomization. The columnar plasma generator (1) and the sheet plasma generator (2) are both connected to the system control module (21), which is used to control the primary activation voltage and primary activation time, as well as the secondary activation voltage and secondary activation time, according to the active ingredients and concentration in the current aqueous solution and the active ingredients and concentration required in the spray. The sheet-shaped plasma generator (2) includes a hollow circular piezoelectric ceramic ring (12), which is an insulating dielectric layer. A metal ring (11) is attached to the end of the piezoelectric ceramic ring (12) near the columnar plasma generator (1). A porous metal sheet (13) is provided in the hollow part of the piezoelectric ceramic ring (12). The axial distance between the metal ring (11) and the porous metal sheet (13) is 2mm-5mm. The inner diameter of the piezoelectric ceramic ring (12) is smaller than the inner diameter of the metal ring (11). The difference between the inner diameters of the metal ring (11) and the piezoelectric ceramic ring (12) is 2mm-5mm. The piezoelectric ceramic ring (12) is connected to a sinusoidal or pulsed high-voltage excitation circuit with rapidly changing amplitude. This allows the sheet plasma generator (2) to generate plasma for secondary activation. At the same time, the piezoelectric ceramic ring (12) is affected by voltage changes, causing the porous metal sheet (13) to vibrate at high speed, thus achieving nanoscale atomization. The piezoelectric ceramic ring (12) has a thickness of 1-2 mm, and the porous metal sheet (13) has a thickness of 0.2-0.4 mm and a pore size of 5-10 μm.

2. The plasma air disinfection device according to claim 1, characterized in that, The water storage chamber (14) is equipped with a conductivity detection module (20) for detecting the concentration of charged ions in the aqueous solution in the water storage chamber (14) and transmitting it to the system control module (21).

3. The plasma air sterilization device according to claim 1, characterized in that, The columnar plasma generator (1) includes a hollow cylindrical dielectric layer (8), the interior of which is filled with a high-voltage electrode (10) made of metal. A metal base (9) is installed at the bottom of the columnar plasma generator (1). A ground electrode (7) located on the outer wall of the dielectric layer (8) is connected to the metal base (9). The highest water level in the water storage chamber (14) is lower than the highest point of the ground electrode (7), so that part of the ground electrode (7) is in contact with the gas in the water storage chamber (14).

4. The plasma air disinfection device according to claim 1, characterized in that, The end of the porous water-absorbing rod (6) passes through the center of the metal ring (11) and the piezoelectric ceramic ring (12) and is closely attached to the porous metal sheet (13).

5. The plasma air sterilization device according to claim 1, characterized in that, The air inlet (15) of the water storage chamber (14) is connected to the air chamber (17) through the air guide pipe (16). Multiple gas cylinders (18) are installed in the air chamber (17). Each gas cylinder (18) contains a different gas. Each gas cylinder (18) has a gas valve (19) installed at its port. The opening and closing degree of different gas valves (19) is controlled to transport the mixed gas of different components to the water storage chamber (14).

6. The plasma air sterilization device according to claim 1, characterized in that, A gas pre-ionization module (22) is installed at the air inlet (15) of the water storage chamber (14) to make the mixed gas charge and dissolve the gas in the water to initially change the conductivity of the solution.

7. The plasma air disinfection device according to claim 1, characterized in that, The top cover and body of the water storage chamber (14) are connected by threads, and the plate plasma generator (2) is installed on the top cover of the water storage chamber (14); a base (3) is provided below the water storage chamber (14), and the system control module (21) is installed in the base (3). The bottom of the base (3) is provided with heat dissipation vent (4) and multiple support pads (5).

8. The disinfection method using the plasma air disinfection device as described in claim 1, characterized in that, Includes the following steps: S1, according to the scenario requirements, a mixed gas of different composition or a pre-ionized mixed gas of different composition is introduced into the water storage chamber (14). The columnar plasma generator (1) ionizes the mixed gas to generate plasma and activates the aqueous solution once. Among them, part of the pre-ionized mixed gas is ionized by the columnar plasma generator (1) to generate plasma and activates the aqueous solution once. Part of the pre-ionized mixed gas dissolves in the water to initially change the conductivity of the solution. S2, the first activated aqueous solution rises along the porous water-absorbing rod (6) to the sheet plasma generator (2) for secondary activation and nano-level atomization; During the primary and secondary activation processes, the system control module (21) controls the primary activation voltage and primary activation time, as well as the secondary activation voltage and secondary activation time, based on the active ingredients and concentrations in the current aqueous solution and the required active ingredients and concentrations in the spray, so that the secondary activated solution that meets the requirements diffuses into the air in the form of aerosol.

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