Plasma-activated water disinfection device and online preparation method

Abstract

This invention relates to the field of online activated water preparation and disinfection technology, specifically to a plasma activated water disinfection device and online preparation method. It includes a nozzle body, connecting pipes, and a combined main unit. The nozzle body comprises a housing and nozzles. The housing has a first split-type high-voltage electrode group, a second split-type high-voltage electrode group, a contraction swirling flow channel, an air inlet, an airflow connection section, and a heating wire. The nozzle has a spiral nozzle orifice group, a swirler group, a water flow path, and a connection section. The combined main unit houses an air pump, a microprocessor, and other components. The microprocessor, as the control core, uses a preset program to achieve coordinated control of the air pump, the first split-type high-voltage electrode group, the second split-type high-voltage electrode group, and the heating wire. This invention enables online instantaneous preparation of plasma activated water, improving ionization efficiency and atomization effect, integrating disinfection and drying functions, and is easy to operate, adaptable to various scenarios such as homes and fresh food processing terminals.

Description

Technical Field

[0001] This invention relates to the field of online activated water preparation and disinfection technology, specifically to a plasma activated water disinfection device and an online preparation method. Background Technology

[0002] In the field of fruit and vegetable cleaning and disinfection, chlorine-containing disinfectant soaking and ozone water cleaning are currently the mainstream treatment methods. Although they can achieve basic sterilization effects, there are many technical defects in practical applications: chlorine-containing disinfection systems are prone to producing chemical residues and odors, posing food safety risks; ozone water has strict requirements on the sealing performance and materials of the preparation equipment, resulting in high equipment investment and maintenance costs; at the same time, the operation procedures of both methods are cumbersome, the supporting equipment is bulky, and they cannot achieve efficient continuous processing that is "ready to use", making it difficult to adapt to the continuous operation needs of fresh food processing lines, and also unable to meet the immediate disinfection needs of end-use water points such as homes and supermarkets.

[0003] Plasma-activated water, as a green and safe disinfection technology, has become an important development direction in the field of fruit and vegetable washing and disinfection due to its rapid, broad-spectrum bactericidal effect and lack of harmful chemical residues. This functional aqueous solution is prepared by the interaction of low-temperature plasma with water, and the water is rich in active components such as reactive oxygen and nitrogen, resulting in a significantly better disinfection effect than traditional methods. Currently, the mainstream preparation routes for plasma-activated water are mainly divided into two categories: gas-phase discharge and direct liquid-phase discharge. Gas-phase discharge activates the water by discharging gas above the water surface or at the contact interface, relying on the diffusion of active particles. Liquid-phase discharge involves immersing electrodes in water to generate active substances in situ within the liquid. However, both technologies face bottlenecks in large-scale application: high energy consumption during large-scale, continuous preparation, and the natural decay of active components in the activated water over time, making it difficult to maintain a stable high concentration over a long period. This fails to meet the immediate and continuous disinfection water needs on-site, limiting the practical application and promotion of plasma-activated water in fruit and vegetable washing and disinfection scenarios.

[0004] Existing publicly available technologies related to plasma-activated water preparation, such as the solutions involved in Chinese invention patent applications with publication numbers CN121361864A and CN119390194A, still fail to address the core pain points in the industry: First, the active particles in activated water have short activity cycles, and pre-prepared activated water is prone to rapid deactivation and cannot be stored for later use; second, the overall size of the preparation equipment is relatively large, occupying a lot of space and having a long operation reaction time, making it difficult to adapt to the convenience and efficiency requirements of home scenarios; third, the usage and control methods of the equipment are simple, with a low level of intelligence, making it unable to adapt to complex and ever-changing application scenarios such as fresh food processing and home use. Summary of the Invention

[0005] The purpose of this invention is to provide a plasma-activated water disinfection device and an online preparation method, which enables the instantaneous and continuous preparation of plasma-activated water, solving the problem of easy decay of its active ingredients; efficiently removes dirt and microorganisms from the surface of fruits and vegetables, while degrading non-water-soluble pesticide residues and avoiding secondary pollution; improves plasma ionization efficiency and optimizes the coupling effect of electric field with gas and water flow; and realizes integrated linkage control of disinfection and drying, improving applicability.

[0006] To achieve the above objectives, the technical solution of this application is as follows: a plasma-activated water disinfection device, comprising a nozzle body, a connecting pipe and a combined main unit, wherein one end of the connecting pipe is sealed to the gas output interface of the combined main unit, and the other end is sealed to the nozzle body; the nozzle body comprises a housing and a nozzle built into the housing; The nozzle includes a spiral nozzle assembly, a vortex generator assembly, a water flow path, and a connecting section. The connecting section is located at the top of the nozzle and has a connection structure adapted to a faucet. The vortex generator assembly is installed in the middle section of the water flow path. The spiral nozzle assembly is arranged at the end of the nozzle. The water flow path passes through the connecting section and the spiral nozzle assembly along the nozzle axis. The housing is provided with an interconnected airflow inlet and a contraction vortex flow channel. The first split high-voltage electrode group is located downstream of the spiral nozzle group and at the end of the housing. The second split high-voltage electrode group is located inside the housing on the outer periphery of the contraction vortex flow channel.

[0007] In another embodiment of the present invention, the housing further includes an airflow connection section, which is connected to a connecting pipeline, and heating wires are arranged in the airflow connection section along the airflow direction.

[0008] In another implementation of the present invention, both the first split high-voltage electrode group and the second split high-voltage electrode group are fed with radio frequency power in a differential coupling manner. Adjacent electrodes maintain a phase difference. During discharge, magnetic dipoles are induced at the electrode boundaries, and an induced electric field parallel to the electrode edge is established, forming a composite electric field distribution that combines capacitive coupling electric field and induced electric field.

[0009] In another embodiment of the present invention, the hydrocyclone assembly consists of multiple radially arranged swirling blades, each swirling blade being arranged at a set angle to the axis of the water flow path, thereby accelerating the flowing water and applying a swirling effect.

[0010] In another implementation of the present invention, the cross-sectional area of ​​the contraction vortex channel is gradually reduced along the airflow direction, and the inner wall profile of the channel can keep the vortex motion state formed by the airflow eccentrically flowing in through the airflow inlet stable.

[0011] In another implementation of the present invention, the combined host has a built-in air pump and a microprocessor. The microprocessor realizes the linkage control of the air pump, the first split high-voltage electrode group, the second split high-voltage electrode group and the heating wire, and completes the switching between disinfection and hot air drying modes.

[0012] In another implementation of the present invention, the first split-type high-voltage electrode group ionizes the water column ejected by the spiral nozzle group to form water mist, and performs secondary ionization on the mixture of the ion wind pre-ionized by the second split-type high-voltage electrode group and the water mist.

[0013] In another implementation of the present invention, the first split high-voltage electrode group and the second split high-voltage electrode group are coaxially arranged and their axes coincide.

[0014] This invention also provides a method for online preparation of plasma-activated water, based on the aforementioned plasma-activated water disinfection device, comprising the following steps: Water enters the water flow path through the connecting section, is accelerated and forms a vortex when it flows through the hydrocyclone group, and is then divided into multiple water streams or preliminary water mist through the spiral nozzle group before entering the ionization area; The air pump inside the combined main unit draws in air and compresses it, then delivers it to the airflow connection section through the connecting pipeline. The gas enters the contraction vortex flow channel through the eccentric airflow inlet to form a vortex. When the vortex gas flows through the second split high-voltage electrode group, it is pre-ionized and forms an ion wind that flows downstream. Water flow or initial water mist meets and mixes with ion wind in the area where the first split high-voltage electrode group is located. The first split high-voltage electrode group sequentially performs water column ionization and secondary ionization of mixed gas in the mixed system to form plasma-activated water mist particles, thereby achieving the disinfection of the target object.

[0015] In another implementation of the present invention, after disinfection is completed, the heating wire is energized to generate heat, which heats the high-speed airflow in the airflow connection section, and the hot air is transported to the target area through the contraction vortex flow channel to complete the drying.

[0016] This invention, by employing the above technical solutions, achieves the following technical effects: Firstly, it realizes the online instantaneous preparation of plasma-activated water mist, allowing for direct generation and output of activated water mist at the tap, eliminating the need for pre-preparation and storage, thus reducing the loss of effective components in the activated water and ensuring that the disinfection activity remains at its optimal state. Secondly, it significantly improves ionization efficiency and gas-liquid treatment effect. The second split-type high-voltage electrode group pre-ionizes the swirling gas to form an ion wind, which is then pre-mixed with the atomized droplets from the nozzle to form a gas-liquid mixed spray. This mixture is then re-ionized by the first split-type high-voltage electrode group, effectively increasing the coverage of the gas-liquid electric field and improving the processing capacity per unit energy, resulting in superior disinfection effect. Thirdly, it optimizes atomization effect and mixing uniformity. The swirler group inside the nozzle works in conjunction with the spiral nozzle group to accelerate, split, and atomize the water flow. The constricted swirling channel of the shell stabilizes the vortex state and enables axial mixing of gas and liquid, significantly reducing the proportion of large droplets and improving atomization consistency. Fourth, it achieves integrated intelligent control. Through the microprocessor, the air pump, two sets of high-voltage electrode groups and heating wires are linked and controlled, which can flexibly switch between disinfection output and hot air drying modes. It is easy to operate and adapts to the comprehensive use needs of multiple scenarios such as fruit and vegetable cleaning. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the plasma-activated water disinfection device; Figure 2 This is a sectional view of the nozzle body; Figure 3 This is a top view of the nozzle body; Figure 4 Here is a flowchart of the online preparation method for plasma-activated water; The numbers in the diagram are explained as follows: 1. Nozzle body; 2. Connecting pipe; 3. Combined main unit; 11. Housing; 12. Nozzle; 111. First split high-voltage electrode assembly; 112. Second split high-voltage electrode assembly; 113. Contracting vortex flow channel; 114. Airflow inlet; 115. Airflow connection section; 116. Heating wire; 121. Spiral nozzle assembly; 122. Swirl assembly; 123. Water flow path; 124. Connection section. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature marked with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0023] Example 1 This embodiment provides a plasma-activated water disinfection device, suitable for scenarios such as household fruit and vegetable washing and small-scale fresh food processing terminals. It comprises a nozzle body 1, connecting pipes 2, and a combined main unit 3. The components are sealed together and work in concert to achieve online preparation, disinfection, and hot air drying of plasma-activated water mist, as detailed below: The nozzle body 1 is the core execution component, including a housing 11 and a nozzle 12 built into the housing 11. The housing 11 and the nozzle 12 form independent and cooperative water and air channels through spatial arrangement. The nozzle 12 includes a spiral nozzle assembly 121, a cyclone separator assembly 122, a water flow path 123, and a connecting section 124. The connecting section 124 is located at the top of the nozzle 12 and is a threaded interface / clamping structure that matches a household faucet, achieving mechanical fixation and sealed connection with the faucet to ensure that the water source does not leak in and maintains the working pressure. The water flow path 123 runs longitudinally through the nozzle 12, with one end connected to the connecting section 124 and the other end extending to the spiral nozzle assembly 121. The cyclone separator assembly 122 is installed in the middle section of the water flow path 123 and consists of multiple radially arranged cyclone blades. The blades are arranged at a set angle with the axis of the water flow path 123, which can accelerate the flowing water and apply rotational motion to make the water flow form a stable vortex. The spiral nozzle assembly 121 is arranged at the end of the nozzle 12 and consists of multiple sets of nozzles arranged in a spiral array to form a multi-hole jet structure, which can divide the large vortex in the water flow path 123 into multiple extremely fine water streams or preliminary water mist.

[0024] The housing 11 provides protection and airflow support for the nozzle 12, and includes a first split high-voltage electrode assembly 111, a second split high-voltage electrode assembly 112, a contraction vortex channel 113, an airflow inlet 114, an airflow connection section 115, and a heating wire 116. The airflow connection section 115 connects the housing 11 to the connecting pipe 2, with both ends sealed to the housing 11 and the connecting pipe 2 respectively. The heating wire 116 is arranged inside along the airflow direction, directly contacting the airflow. When energized, it heats the high-speed airflow, with the heating power configured according to the required airflow temperature and flow rate for drying. The airflow inlet 114 is eccentrically connected to the housing 11, with a radial offset between its inlet axis and the central axis of the housing 11, serving as the inlet for high-speed gas to enter the nozzle body 1. The converging vortex channel 113 is located in the outer area of ​​the nozzle 12, and its upper end is connected to the airflow inlet 114. The cross-sectional area of ​​the channel is gradually reduced along the airflow direction, and the inner wall is provided with a profile to maintain the stability of the vortex motion formed by the airflow eccentrically flowing in from the airflow inlet 114. The second split high-pressure electrode group 112 is located in the shell 11 on the outer periphery of the converging vortex channel 113 and is used to pre-ionize the vortex gas in the vortex channel. The first split high-pressure electrode group 111 is located downstream of the spiral nozzle group 121 and at the end of the shell 11, and is axially corresponding to the spiral nozzle group 121. It is also coaxially arranged with the second split high-pressure electrode group 112 and their axes coincide. Its working voltage, electrode spacing and electric field strength parameters are designed to match the water column flow rate, flow velocity and gas flow velocity.

[0025] Preferably, both the first split-type high-voltage electrode group 111 and the second split-type high-voltage electrode group 112 are fed with radio frequency power through differential coupling. Adjacent electrodes maintain a phase difference. During discharge, magnetic dipoles are induced at the electrode boundaries, and an induced electric field parallel to the electrode edge is established, forming a composite electric field distribution that combines capacitive coupling electric field and induced electric field. The function of the second split-type high-voltage electrode group 112 is to pre-ionize the vortex gas flowing in the contraction vortex channel 113, so that the air is ionized under the action of high-voltage electric field to form ion wind. The first split-type high-voltage electrode group 111 has a dual ionization function, which ionizes the extremely fine water column ejected by the spiral nozzle group 121 to convert it into water mist, and performs secondary ionization on the gas after the pre-ionized ion wind and water mist are mixed, so that the mixed gas reaches a further ionized state.

[0026] The connecting pipe 2 is made of a flexible hose with electrical insulation properties. The wall thickness is designed according to the working pressure. Its interior is a gas transmission channel. One end is sealed to the gas output interface of the combined host 3, and the other end is sealed to the airflow connection section 115 of the nozzle body 1, so as to realize the stable delivery of gas from the combined host 3 to the nozzle body 1. At the same time, the connecting pipe 2 undertakes the task of wiring. Wiring channels are set on its exterior / internal side for laying control signal lines and power transmission lines. The lines are constrained at fixed intervals to prevent displacement or wear when the pipe moves.

[0027] The combined main unit 3 incorporates an air pump, a microprocessor, and a power module. The air pump draws in air from the outside and compresses it, providing a pressurized air source for the entire air circuit. The power module converts the external input power to the voltage level required by the system, providing power distribution to all electrical components such as the air pump, microprocessor, two sets of separate high-voltage electrode groups, and heating wire 116. In disinfection mode, the microprocessor controls the air pump to supply air normally, the two sets of separate high-voltage electrode groups to work synchronously, and the heating wire 116 to remain de-energized. In drying mode, it controls the two sets of separate high-voltage electrode groups to stop working, the heating wire 116 to be energized for heating, and the air pump to continue supplying air. This achieves coordinated control of the air pump, the first separate high-voltage electrode group 111, the second separate high-voltage electrode group 112, and the heating wire 116, enabling flexible switching between disinfection and hot air drying modes.

[0028] Example 2 This embodiment provides an online method for preparing plasma-activated water, based on the plasma-activated water sterilization device described in Embodiment 1. It employs an online, instantaneous preparation mode, completing the generation, sterilization, and drying of activated water mist at the tap end. No pre-preparation or storage is required throughout the process, effectively preventing the degradation of active ingredients. The specific steps are as follows: Water transport and pretreatment: The connecting section 124 of the nozzle 12 is sealed to the faucet. After the faucet is turned on, the water source enters the water flow path 123 without leakage through the connecting section 124. The water flows down along the longitudinally penetrating water flow path 123 to the hydrocyclone group 122. When the water flows through the hydrocyclone group 122, it is accelerated by the radial swirling blades, and the flow velocity is greatly increased. At the same time, it is subjected to a rotational motion state, forming a stable swirling shape. The swirling water continues to flow down to the spiral nozzle group 121 at the end of the nozzle 12. After passing through the multi-hole spray structure, it is divided into multiple ultra-fine water streams or preliminary water mist. After leaving the spiral nozzle group 121, it immediately enters the downstream ionization area to prepare for subsequent ionization.

[0029] Gas delivery and pre-ionization: When the combined main unit 3 is started, the built-in air pump draws in air from the outside and compresses it. The compressed high-pressure gas is stably delivered to the airflow connection section 115 of the nozzle body 1 through the gas transmission channel of the connecting pipe 2, and then enters the interior of the housing 11 through the airflow inlet 114 which is eccentrically connected to the housing 11. The gas is constrained by the flow channel shape at the airflow inlet 114. Combined with the eccentric angle of the inlet, the airflow velocity and the guiding effect of the flow channel wall, a stable vortex is formed, and then it enters the contraction vortex flow channel 113. The vortex gas maintains a stable vortex motion state in the contraction vortex flow channel 113 and flows downstream. When it flows through the area where the second split high-voltage electrode group 112 is located, it is pre-ionized under the action of the high-voltage composite electric field, forming an ion wind and continuing to flow downstream along the flow channel.

[0030] Mixed ionization and disinfection operation: The ultrafine water stream / preliminary water mist sprayed from the spiral nozzle group 121 meets and mixes thoroughly with the ion wind generated by the second split high-voltage electrode group 112 in the area where the first split high-voltage electrode group 111 is located. The first split high-voltage electrode group 111 performs double ionization on the mixture in sequence. First, it ionizes the ultrafine water column to completely convert it into water mist. Then, it performs secondary ionization on the mixture of ion wind and water mist to achieve a deep ionization state, forming plasma-activated water mist particles rich in active oxygen, active nitrogen and other components. The activated water mist particles act directly on the target objects such as fruits and vegetables to be disinfected, achieving rapid and broad-spectrum disinfection without any chemical residue.

[0031] Hot air drying operation: After the disinfection operation is completed, the microprocessor of the combined main unit 3 issues a control command to start the heating wire 116 inside the airflow connection section 115; the heating wire 116 generates heat after being energized, which heats the high-speed airflow flowing through the airflow connection section 115, and the heating power is matched according to the airflow temperature and flow rate required for drying; the heated hot air is continuously delivered to the surface of the target object through the airflow inlet 114 and the contraction vortex channel 113 to dry the disinfected target object with hot air, completing the entire washing and disinfection process; after drying, the heating wire 116 can be turned off by the microprocessor, and the device returns to the disinfection standby state, realizing flexible mode switching.

[0032] This method achieves the instant preparation and output of plasma-activated water through the coordinated operation of the gas and water circuits and the efficient effect of two-stage ionization. It also integrates disinfection and drying functions, is easy to operate, has a fast response speed, and can be adapted to the instant washing and disinfection needs of various scenarios such as homes and fresh food processing terminals.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A plasma-activated water disinfection device, characterized in that, It includes a nozzle body (1), a connecting pipe (2) and a combined host (3). One end of the connecting pipe (2) is sealed to the gas output interface of the combined host (3), and the other end is sealed to the nozzle body (1). The nozzle body (1) includes a housing (11) and a nozzle (12) built into the housing (11). The nozzle (12) includes a spiral nozzle assembly (121), a cyclone separator assembly (122), a water flow path (123), and a connecting section (124). The connecting section (124) is located at the top of the nozzle (12) and has a connection structure adapted to a faucet. The cyclone separator assembly (122) is installed in the middle section of the water flow path (123). The spiral nozzle assembly (121) is arranged at the end of the nozzle (12). The water flow path (123) passes through the connecting section (124) and the spiral nozzle assembly (121) along the axial direction of the nozzle (12). The housing (11) is provided with an airflow inlet (114) and a contraction vortex flow channel (113) that are interconnected. The first split high-voltage electrode group (111) is located downstream of the spiral nozzle group (121) and at the end of the housing (11). The second split high-voltage electrode group (112) is located inside the housing (11) on the outer periphery of the contraction vortex flow channel (113).

2. The plasma-activated water disinfection device according to claim 1, characterized in that, The housing (11) further includes an airflow connection section (115) which is connected to a connecting pipeline, and heating wires (116) are arranged in the airflow connection section (115) along the airflow direction.

3. The plasma-activated water disinfection device according to claim 1, characterized in that, Both the first split high-voltage electrode group (111) and the second split high-voltage electrode group (112) use differential coupling to feed radio frequency power. Adjacent electrodes maintain a phase difference. During discharge, magnetic dipoles are induced at the electrode boundary, and an induced electric field parallel to the electrode edge is established, forming a composite electric field distribution that combines capacitive coupling electric field and induced electric field.

4. The plasma-activated water disinfection device according to claim 1, characterized in that, The hydrocyclone assembly (122) consists of multiple radially arranged swirling blades. Each swirling blade is arranged at a set angle to the axis of the water flow path (123), thereby accelerating the flowing water and applying a swirling effect.

5. The plasma-activated water disinfection device according to claim 1, characterized in that, The cross-sectional area of ​​the contraction vortex channel (113) is gradually reduced along the airflow direction. The inner wall profile of the channel can keep the vortex motion state formed by the airflow eccentrically flowing in through the airflow inlet (114) stable.

6. The plasma-activated water disinfection device according to claim 1, characterized in that, The combined host (3) has a built-in air pump and microprocessor. The microprocessor realizes the linkage control of the air pump, the first split high-voltage electrode group (111), the second split high-voltage electrode group (112) and the heating wire (116) to complete the switching between disinfection and hot air drying modes.

7. The plasma-activated water disinfection device according to claim 1, characterized in that, The first split-type high-voltage electrode group (111) ionizes the water column sprayed by the spiral nozzle group (121) to form water mist, and performs secondary ionization on the mixture of the ion wind pre-ionized by the second split-type high-voltage electrode group (112) and the water mist.

8. The plasma-activated water disinfection device according to claim 1, characterized in that, The first split high-voltage electrode group (111) and the second split high-voltage electrode group (112) are coaxially arranged and their axes coincide.

9. A method for online preparation of plasma-activated water, implemented based on the plasma-activated water disinfection device according to any one of claims 1-7, characterized in that, Includes the following steps: Water enters the water flow path (123) through the connecting section (124), is accelerated and forms a vortex when it flows through the hydrocyclone group (122), and is then divided into multiple water streams or preliminary water mist through the spiral nozzle group (121) before entering the ionization area; The air pump in the combined host draws in air and compresses it, and then delivers it to the airflow connection section (115) through the connecting pipeline. The gas enters the contraction vortex channel (113) through the eccentric airflow inlet (114) to form a vortex. When the vortex gas flows through the second split high-voltage electrode group (112), it is pre-ionized and forms an ion wind that flows downstream. Water flow or initial water mist meets and mixes with ion wind in the area where the first split high-voltage electrode group (111) is located. The first split high-voltage electrode group (111) sequentially performs water column ionization and secondary ionization of mixed gas on the mixed system to form plasma-activated water mist particles, thereby achieving the disinfection of the target object.

10. The method for online preparation of plasma-activated water according to claim 8, characterized in that, after disinfection, the heating wire (116) is energized to generate heat, which heats the high-speed airflow in the airflow connection section (115), and the hot air is transported to the target area through the contraction vortex channel (113) to complete the drying.

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