An activated water preparation device and method based on water curtain plasma

Abstract

The present invention discloses a device and method for preparing activated water based on a water curtain plasma. The device comprises: a high-voltage electrode, a water curtain device, a water pump, a ground electrode, and a water tank. The water curtain device comprises a water storage tank, a through hole, and a water inlet, with multiple water curtain outlets arranged around the upper end of the water storage tank. The water pump pumps an aqueous solution into the water storage tank through the water inlet. When the water storage tank is full, the water overflows from the water curtain outlet, forming a water curtain. The through hole houses the high-voltage electrode. An air inlet is provided at the upper end of the high-voltage electrode, and an air outlet is provided at the lower end. A ground electrode is provided at the center of the water tank, above the liquid level. The ground electrode and the high-voltage electrode are coaxially arranged to form a plasma discharge region, which is used to break down the working gas pumped into the air inlet to generate plasma, which then enters the water curtain to activate the aqueous solution. A water outlet is provided on the side of the water tank, and the activated solution is collected by the water tank and flows out through the water outlet. This method increases the efficiency of plasma utilization and the efficiency of activated water in producing active particles.

Description

Technical Field

[0001] The present invention belongs to the field of plasma technology, and more specifically, relates to an activated water preparation device and method based on water curtain plasma. Background Art

[0002] Plasma technology is currently at the forefront. Atmospheric pressure non-equilibrium plasma, also known as low-temperature plasma, has an electron temperature far exceeding both the air temperature and the neutral particle temperature. Atmospheric pressure non-equilibrium plasma is the most widely used type of plasma today. In recent years, plasma-activated water technology has attracted increasing attention, with applications in agriculture, material modification, sterilization, and wastewater treatment. Therefore, the development of plasma-activated water with a higher concentration of active particles and lower energy consumption has become a hot topic.

[0003] Research on activated water preparation has been conducted both domestically and internationally. Five main methods of plasma-water exchange exist: (a) plasma discharge directly in water; (b) active substances generated by gas-phase plasma diffuse into the liquid phase (direct plasma-liquid contact); (c) active substances generated by gas-phase plasma diffuse into the liquid phase (no direct plasma-liquid contact); (d) aerosol; and (e) gas-phase plasma generated in the liquid (in the form of bubbles). Currently, the most common methods for producing activated water are surface discharge and submerged discharge. The active substances generated by the discharge react with the aqueous solution to form a plasma-activated solution.

[0004] However, using water surface discharge presents the problem of the active particles generated by the plasma rapidly dissipating into the gas phase. Furthermore, the contact area between the plasma and the water is very small, resulting in insufficient utilization of the plasma and low efficiency in generating plasma-activated solutions. Using water discharge, however, is difficult because direct plasma discharge in water often requires very high voltages, and long-term immersion of the high-voltage electrode in the liquid phase can easily corrode it. Summary of the Invention

[0005] In response to the defects of the related art, the purpose of the present invention is to provide an activated water preparation device and method based on water curtain plasma, aiming to solve the problems of low plasma utilization efficiency, low activation efficiency, large voltage requirement and easy corrosion of electrodes in the existing process of generating plasma activated solution.

[0006] To achieve the above objectives, in a first aspect, the present invention provides an activated water preparation device based on water curtain plasma, comprising: a high voltage electrode, a water curtain device, a water pump, a ground electrode and a water tank;

[0007] The water curtain device includes a water storage tank with a closed bottom and an open top, a water inlet arranged at the top of the water storage tank, a plurality of water curtain outlets arranged around the top of the water storage tank, and a through hole arranged at the center of the water storage tank and higher than the water storage tank; the water pump is used to pump the aqueous solution into the water storage tank through the water inlet; the water curtain outlet is used to overflow the aqueous solution to form a water curtain; the through hole runs through the water storage tank and is used to place the high-voltage electrode;

[0008] The high-voltage electrode is connected to a high-voltage power supply. The high-voltage electrode is a hollow tubular electrode with an air inlet at the upper end and an air outlet at the lower end. The air inlet is connected to a gas cylinder for introducing working gas.

[0009] A ground electrode higher than the liquid level in the water tank is provided at the center of the water tank. The ground electrode is coaxially arranged with the high-voltage electrode and separated by a preset distance to form a plasma discharge region. When the voltage difference in the plasma discharge region reaches a threshold value, the working gas therein is broken down to generate plasma, which enters the water curtain to activate the aqueous solution. A water outlet is provided on the side of the water tank, and the water tank is used to collect the activated solution and discharge it through the water outlet.

[0010] Optionally, the aqueous solution outlet is connected to the water pump, and the water pump is used to pump the activated solution into the water inlet again for circulation.

[0011] Optionally, a long tube higher than the liquid level of the water tank is set in the center of the water tank, the long tube is not connected to the water tank, the long tube is filled with a conductive solution and is grounded through a wire, serving as the ground electrode.

[0012] Optionally, a bottom groove is provided at the bottom of the water curtain device.

[0013] Optionally, a limiting groove is provided on the outer surface of the water curtain device, and the limiting groove is a groove along the water curtain outlet to the bottom of the water curtain device, which is used to limit the directional flow of the aqueous solution along the limiting groove.

[0014] Optionally, the outer surface of the water curtain device is further provided with a coaxial cylindrical outer wall therewith, for cooperating with the restriction groove to limit the directional flow of the aqueous solution in the restriction groove.

[0015] Optionally, the water curtain device adopts a split structure, and the water inlet and the water storage tank are separately arranged; an annular outer wall is arranged on the outside of the water storage tank, and the annular outer wall is higher than the height of the long tube in the water storage tank, and the water inlet is arranged on the annular outer wall.

[0016] Optionally, the material of the water curtain device includes one of quartz glass, 3D printing material, glass, and ceramics;

[0017] The aqueous solution comprises one or more mixed liquids selected from distilled water, tap water, deionized water, sodium chloride solution, hydrogen peroxide solution, ethanol solution, phosphate buffer solution and hydrochloric acid solution;

[0018] The working gas includes one or more mixed gases selected from the group consisting of air, nitrogen, argon and helium.

[0019] In a second aspect, the present invention further provides a method for preparing activated water based on water curtain plasma, which is applied to the activated water preparation device as described in any one of the first aspects, comprising:

[0020] When the potential difference between the high-voltage electrode and the ground electrode reaches a threshold, the working gas input from the gas inlet is broken down at the high-voltage electrode, causing gas discharge and generating plasma;

[0021] When the aqueous solution pumped into the water tank by the water pump fills the water tank, it overflows from the water curtain outlet to form a water curtain;

[0022] Active particles in the plasma enter the surrounding water curtains to obtain activated aqueous solution, which then flows out from the aqueous solution outlet of the water tank.

[0023] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0024] 1. The present invention provides an activated water preparation device based on water curtain plasma, which uses a water curtain that is millimeter-level away from the plasma and can surround the plasma for a week, so that the active particles in the plasma can be quickly blown into the water curtain. Compared with simply using plasma to treat the water surface, the utilization efficiency of the plasma and the efficiency of activated water to produce active particles are greatly increased.

[0025] 2. The present invention provides an activated water preparation device based on water curtain plasma, which uses a high-voltage electrode and a water electrode with a preset distance to form a plasma discharge area, performs plasma discharge, and generates a variety of active particles. Compared with the electrode discharge in water, it reduces the loss of the electrode, reduces the voltage required for discharge, and reduces the discharge energy consumption.

[0026] 3. The present invention provides a method for preparing activated water based on water curtain plasma, which adopts an activated water preparation device based on water curtain plasma to prepare activated water, thereby generating activated water with a high concentration of active substances and improving the production efficiency of activated water. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic structural diagram of an activated water preparation device based on water curtain plasma provided in Example 1 of the present invention;

[0028] Figure 2 A schematic structural diagram of a water tank of an activated water preparation device based on water curtain plasma provided in Example 1 of the present invention;

[0029] Figure 3-Figure 9 Schematic diagram of the structure of the integrated water curtain device provided in Example 1 of the present invention, wherein (a) is a three-dimensional top view, (b) is a three-dimensional bottom view, and (c) is a cross-sectional view;

[0030] Figure 10 This is a structural diagram of a split-type water curtain device provided in Example 1 of the present invention; (a) is a three-dimensional diagram, and (b) is a cross-sectional diagram.

[0031] Markings in the figure are: 1- tubular electrode (high-voltage electrode), 2- water curtain device, 3- water pump, 4- water electrode (ground electrode), 5- water tank, 6- water storage tank, 7- water inlet, 8- water curtain outlet, 9- through hole, 10- high-voltage power supply, 11- air inlet, 12- air outlet, 13- gas cylinder, 14- aqueous solution outlet, 15- long tube, 16- bottom groove, 17- limiting groove, 18- water flow direction. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0033] The contents involved in the above embodiment are described below in conjunction with a preferred embodiment.

[0034] Example 1

[0035] like Figure 1 As shown, an activated water preparation device based on water curtain plasma includes: a high voltage electrode 1, a water curtain device 2, a water pump 3, a ground electrode 4 and a water tank 5;

[0036] The water curtain device 2 includes a water storage tank 6 with a closed bottom and an open top, a water inlet 7 provided at the top of the water storage tank 6, a plurality of water curtain outlets 8 provided around the top of the water storage tank 6, and a through hole 9 provided at the center of the water storage tank 6 and higher than the water storage tank 6; the water pump 3 is used to pump the aqueous solution into the water storage tank 6 through the water inlet 7; the water curtain outlet 8 is used to overflow the aqueous solution to form a water curtain; the through hole 9 passes through the water storage tank 6 and is used to place the high-voltage electrode 1;

[0037] The high-voltage electrode 1 is connected to a high-voltage power supply 10. The high-voltage electrode 1 is a hollow tubular electrode with an air inlet 11 at the upper end and an air outlet 12 at the lower end. The air inlet 11 is connected to a gas cylinder 13 for introducing working gas.

[0038] A ground electrode 4 is provided at the center of the water tank 5 and is higher than the liquid level in the water tank 5. The ground electrode 4 is coaxially arranged with the high-voltage electrode 1 and is separated by a preset distance to form a plasma discharge region. When the voltage difference in the plasma discharge region reaches a threshold value, the working gas therein is broken down to generate plasma, which enters the water curtain to activate the aqueous solution. A water outlet 14 is provided on the side of the water tank 5. The water tank 5 is used to collect the activated solution and flow it out through the water outlet 14.

[0039] The high-voltage electrode 1 is connected to a high-voltage power supply 10. The high-voltage electrode 1 is coaxially arranged with the ground electrode 4 at a predetermined distance, forming a plasma discharge region. The high-voltage electrode 1 is made of one of silver, copper, aluminum, iron, tungsten, and stainless steel. The high-voltage power supply 10 can be, but is not limited to, a DC power supply, an AC power supply, a nanosecond pulse power supply, or a microsecond pulse power supply. When the voltage difference between the high-voltage electrode 1 and the ground electrode 4 exceeds the working gas discharge threshold, the lower port of the high-voltage electrode 1 breaks down the working gas introduced into the gas inlet 11 to generate plasma. When no working gas is introduced, the discharge is unstable and filamentous. When gas is introduced, the plasma becomes diffuse, with a more stable discharge and a larger surface area. The working gas can include a mixture of one or more of air, nitrogen, argon, and helium. The general process of a plasma liquid-phase reaction is that active species (ozone, hydroxyl radicals, excited nitrogen molecules, etc.) and high-energy electrons in the plasma enter the liquid solution and undergo a series of reactions with H2O molecules, including ion transfer, complex decomposition, and Penning ionization. After the above process, active particles including hydroxyl radicals, singlet oxygen, superoxide anion radicals, hydrogen peroxide, nitrite, nitrate and peroxynitrite are generated in the aqueous solution.

[0040] Among them, a long tube 15 is set above the liquid level of the water tank in the center of the water tank 5. The long tube 15 is not connected to the water tank 5. The long tube 15 is filled with a conductive solution and is grounded through a wire to serve as a ground electrode 4. The conductive solution is not limited to one or more mixed solutions of solutions with a certain conductivity such as tap water and sodium chloride solution. Preferably, the long tube 15 is filled with a tap water solution. Since tap water has conductivity, it can be used as a water electrode (ground electrode) 4, and the water in the long tube 15 only serves as a water electrode (ground electrode). If the long tube 15 is not set in the water tank 5, the plasma will be directly blown out of the tubular electrode of the high-voltage electrode 1 in an umbrella shape (small on the top and large on the bottom), which will result in insufficient contact between the plasma and the water curtain, and low utilization efficiency of the plasma. The long tube 15 is filled with tap water as the ground electrode, which is designed to gather the plasma. As the working gas is continuously pumped into the air inlet 11, the working gas drives the generated plasma to move toward the ground electrode 4, generating a spindle-shaped plasma area. When the water curtain surrounds the plasma, it can be very close to every part of the plasma, making it easier for the gas to quickly blow the plasma into the water curtain, thereby improving the utilization efficiency of the plasma.

[0041] The aqueous solution is pumped into the water inlet 7 by the water pump 3. The water is continuously stored in the water storage tank 6 of the water curtain device 2, and the water level continues to rise until it reaches the water curtain outlet 8, from which the water flows down to form a water curtain. The water curtain generated by the water curtain device 2 flows evenly around the plasma discharge area, allowing the plasma to fully contact the aqueous solution in the water curtain. The distance between the water curtain device 2 and the plasma discharge area is on the order of millimeters, and the bottom radius of the water curtain device 2 is on the order of millimeters. In this embodiment, the preset distance between the high-voltage electrode 1 and the ground electrode 4 is the difference between the bottom radius and the radius of the through hole 9, which is at least 1.5 mm and is controlled between 5 mm and 1 cm. When the high-voltage electrode 1 generates plasma, the working gas will quickly blow the high-energy active particles in the plasma into the water curtain, which can greatly improve the efficiency of the plasma-activated solution. The activity of the plasma-activated solution can also be controlled by adjusting the distance between the water curtain and the plasma. Among them, the material of the water curtain device includes one of quartz glass, 3D printing material, glass, and ceramic; the aqueous solution includes one or more mixed liquids of distilled water, tap water, deionized water, sodium chloride solution, hydrogen peroxide solution, ethanol solution, phosphate buffer solution and hydrochloric acid solution.

[0042] Furthermore, the diameter of the tubular high-voltage electrode 1, the distance between the water curtain and the plasma discharge area, and the distance between the bottom of the tubular high-voltage electrode 1 and the water electrode 4 can all be controlled; by adjusting these distance parameters, the best discharge effect can be obtained.

[0043] The technical solution of the present invention generates a water curtain through a water curtain device. A high-voltage electrode and a ground electrode are used in the water curtain to form a plasma discharge area, ionize the introduced working gas to generate plasma and multiple active particles. The distance between the plasma discharge area and the water curtain is on the order of millimeters, which provides a large contact area. The working gas blows the plasma into the water curtain, thereby solving the technical problems of low plasma utilization efficiency, low activation efficiency, large voltage requirement, and easy corrosion of electrodes in the existing process of generating plasma activation solution. The voltage requirement is reduced, the loss of the electrode is reduced, and the beneficial effect of increasing the utilization efficiency of plasma and the efficiency of generating active particles from activated water is achieved.

[0044] Based on the above embodiments, Figure 1 As shown, optionally, the aqueous solution outlet 14 is connected to the water pump 3, and the water pump 3 is used to pump the activated solution into the water inlet 7 again for circulation.

[0045] The activated solution is collected in the water tank 5 and flows out through the water outlet 14. The water pump 3 re-pumps the solution into the water inlet 7, where it is then circulated through the water curtain device 2 to increase the active particle content in the solution. The cycle time is controlled as needed; in this embodiment, a 10-minute cycle is preferred.

[0046] Optionally, a bottom groove 16 is provided at the bottom of the water curtain device 2 to prevent the aqueous solution from gathering at the bottom center of the water curtain device 2 .

[0047] like Figure 3-Figure 5 As shown, the water curtain device 2 adopts an integrated structure. The shape of the water curtain device 2 is not limited and can be funnel-shaped or cylindrical. The bottom of the water curtain device 2 is also provided with a groove. Because the selected device material may be hydrophilic, when water flows down and reaches the bottom of the water curtain device 2, if the bottom of the device does not have a groove, the surrounding water flow will converge at the center point of the bottom of the device, that is, converge along the lower end of the through hole 9, rather than flowing straight down along the surrounding surfaces. Therefore, the device has a bottom groove 16 to help the aqueous solution flow smoothly and form a water curtain.

[0048] Furthermore, different shapes and different settings of water curtain devices can be used in different embodiments, refer to Figure 5 , the water storage tank 6 is provided on the upper end surface, and the water curtain outlet 8 is provided on the upper end surface; Figure 1 and Figure 3 The water outlet 8 is arranged around the upper end of the side wall of the water storage tank 6. Figure 1 、 Figure 3 and Figure 5 In the embodiment of the present invention, the water outlets are all circular; Figure 4The water outlet 8 is arranged around the upper end of the side wall of the water storage tank 6. The water outlet 8 is set to be square and connected to the upper end surface.

[0049] Furthermore, there is no water curtain outlet 8 directly above the water inlet 7 to avoid the water flowing down here and causing disorder when it flows through the edge of the water inlet 7. Figure 1 , the water inlet 7 and the water curtain outlet 8 are arranged at the same level. Figure 2-4 The water inlet 7 is located at the lower end of the outer wall of the water curtain device 2 compared to the water curtain outlet 8, and the water curtain outlet 8 is not provided directly above the water inlet 7.

[0050] Based on the above embodiment, optionally, a limiting groove 17 is provided on the outer surface of the water curtain device 2. The limiting groove 17 is a groove along the water curtain outlet 8 to the bottom of the water curtain device 2, which is used to limit the directional flow of the aqueous solution along the limiting groove 17.

[0051] Reference Figure 6-Figure 8 A limiting groove 17 is provided on the outer surface of the water curtain device 2 to limit the directional flow of the aqueous solution. Figure 6 ,for Figure 3 The outer surface of the water curtain device 2 of the embodiment shown is provided with a limiting groove 17; Figure 7 ,for Figure 1 The outer surface of the water curtain device 2 of the embodiment shown is provided with a limiting groove 17; Figure 8 ,for Figure 4 The outer surface of the water curtain device 2 of the embodiment shown is additionally provided with a limiting groove 17; both are grooves along the water curtain outlet 8 to the bottom of the water curtain device 2. Furthermore, the distance between the two grooves is minimized as much as possible to ensure that the aqueous solution flows down along the grooves and does not flow arbitrarily on the surface, so that the water curtain generated at the lower end of the water curtain device 2 can be more coherent.

[0052] Optional, such as Figure 9 As shown, the outer surface of the water curtain device 2 is further provided with a coaxial cylindrical outer wall therewith, which is used to cooperate with the limiting groove 17 to limit the directional flow of the aqueous solution in the limiting groove 17 .

[0053] Reference Figure 9 The water solution that needs to be activated is pumped into the water inlet 7 through the water pump 3, and is continuously stored in the water storage tank 6 of the water curtain device 2. The water level continues to rise, and then flows along the Figure 9 The direction of the arrow in (c) is the direction of water flow 18, and the water flows down through the arc-shaped outlet at the lower end of the water curtain device 2, i.e. the water curtain outlet 8, to form a water curtain. Figure 6 、 7 The grooves in the middle 8 restrict the direction of water flow, which more strictly restricts the direction of water flow. It avoids splashing of the aqueous solution during flow, and all the outflowing aqueous solution forms a water curtain.

[0054] Optional, such as Figure 10 As shown, the water curtain device 2 adopts a split structure, and the water inlet 7 and the water storage tank 6 are separately arranged; an annular outer wall 19 is arranged on the outside of the water storage tank 6, and the annular outer wall 19 is higher than the height of the through hole 9 in the water storage tank 6, and the water inlet 7 is arranged on the annular outer wall 19.

[0055] The aqueous solution to be activated is pumped into the water inlet 7 through a water pump, and the water is continuously stored in the water storage tank 6 of the water curtain device 2. The water level continuously rises and then overflows the water storage tank 6 to form a water curtain. The water curtain device 2 with a split structure is easy to clean each component.

[0056] Example 2

[0057] The present invention also provides a method for preparing activated water based on water curtain plasma, which is applied to any of the activated water preparation devices described in Example 1, comprising:

[0058] When the potential difference between the high-voltage electrode and the ground electrode reaches a threshold, the working gas input from the gas inlet is broken down at the high-voltage electrode, causing gas discharge and generating plasma;

[0059] When the aqueous solution pumped into the water tank by the water pump fills the water tank, it overflows from the water curtain outlet to form a water curtain;

[0060] The active particles in the plasma enter the surrounding water curtains to obtain activated aqueous solution, which flows out from the aqueous solution outlet of the water tank.

[0061] For example, a preferred embodiment is used for description. Figure 1As shown, the high-voltage electrode 1 is a copper tube electrode with an outer diameter of 2 mm, an inner diameter of 1.6 mm, and a length of 10 cm. The copper tube extends 2 mm from the through-hole in the water curtain device 2 where it is placed, ensuring that plasma is generated between the copper tube electrode and the ground electrode 4. The bottom of the copper tube is 1.5 cm away from the liquid level in the ground electrode 4. Air is introduced into the copper tube at a rate of 2 L / min, and then a water cycle is initiated. A water pump 3 is used to pump 0.15 L / min of tap water solution into the water inlet 7 of the water curtain device 2. The water solution accumulates in the water storage tank 6 until it reaches the water curtain outlet 8. The water flows down the grooves and is collected in the water tank 5. It then flows out through the water solution outlet 14 of the water tank 5, passes through the water pump 3, and is pumped back to the water inlet 7 of the water curtain device 2, completing the water cycle. Finally, the device is powered by a high-voltage nanosecond pulse power supply with a voltage of 27 kV, 2 kHz, and 500 ns. At this point, a plasma is generated between the bottom of the copper tube electrode and the water electrode. The water curtain is 5mm from the center of the copper tube, surrounding the plasma and keeping it very close to the plasma. The gas pumped through the copper tube also helps to draw the active substances generated in the plasma into the water curtain, significantly improving the nitrogen fixation efficiency of the device. The plasma discharge intensity can be adjusted by adjusting the voltage applied to the copper tube electrode, the gas flow rate entering the copper tube electrode, the flow rate of the water curtain, and the distance between the water curtain and the plasma to achieve the optimal discharge effect, the lowest discharge energy consumption, and the highest active substance concentration.

[0062] The method for producing activated water based on water curtain plasma provided in an embodiment of the present invention can be applied to an activated water production device based on water curtain plasma provided in any embodiment of the present invention to produce activated water with a high concentration of active substances. This method has the corresponding beneficial effects of an activated water production device based on water curtain plasma.

[0063] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An activated water preparation device based on water curtain plasma, characterized in that, include: High voltage electrode, water curtain device, water pump, ground electrode and water tank; The water curtain device includes a water storage tank with a closed bottom and an open top, a water inlet arranged at the top of the water storage tank, a plurality of water curtain outlets arranged around the top of the water storage tank, and a through hole arranged at the center of the water storage tank and higher than the water storage tank; the water pump is used to pump the aqueous solution into the water storage tank through the water inlet; the water curtain outlet is used to overflow the aqueous solution to form a water curtain; the through hole runs through the water storage tank and is used to place the high-voltage electrode; The high-voltage electrode is connected to a high-voltage power supply. The high-voltage electrode is a hollow tubular electrode with an air inlet at the upper end and an air outlet at the lower end. The air inlet is connected to a gas cylinder for introducing working gas. A ground electrode is provided at the center of the water tank, which is higher than the liquid level in the water tank. The ground electrode is coaxially arranged with the high-voltage electrode and separated by a preset distance to form a plasma discharge region. When the voltage difference in the plasma discharge region reaches a threshold value, the working gas therein is broken down to generate plasma, which enters the water curtain to activate the aqueous solution. A water outlet is provided on the side of the water tank, and the water tank is used to collect the activated aqueous solution and discharge it through the water outlet. A limiting groove is provided on the outer surface of the water curtain device. The limiting groove is a groove extending from the water curtain outlet to the bottom of the water curtain device, and is used to limit the directional flow of the aqueous solution along the limiting groove.

2. The activated water preparation device based on water curtain plasma as claimed in claim 1, characterized in that, The aqueous solution outlet is connected to the water pump, and the water pump is used to pump the activated solution into the water inlet again for circulation.

3. The activated water preparation device based on water curtain plasma as claimed in claim 1, characterized in that, A long tube higher than the liquid level of the water tank is set in the center of the water tank. The long tube is not connected to the water tank. The long tube is filled with a conductive solution and is grounded through a wire to serve as the ground electrode.

4. The activated water preparation device based on water curtain plasma as claimed in claim 1, characterized in that, A bottom groove is provided at the bottom of the water curtain device.

5. The activated water preparation device based on water curtain plasma as claimed in claim 1, characterized in that, The outer surface of the water curtain device is further provided with a coaxial cylindrical outer wall therewith, which is used to cooperate with the limiting groove to limit the directional flow of the aqueous solution in the limiting groove.

6. The activated water preparation device based on water curtain plasma as claimed in claim 1, characterized in that, The water curtain device adopts a split structure, and the water inlet and the water storage tank are separately arranged; an annular outer wall is arranged on the outside of the water storage tank, and the annular outer wall is higher than the long tube in the water storage tank, and the water inlet is arranged on the annular outer wall.

7. The activated water preparation device based on water curtain plasma as claimed in claim 1, characterized in that, The material of the water curtain device includes one of quartz glass, 3D printing material, glass, and ceramic; The aqueous solution comprises one or more mixed liquids selected from distilled water, tap water, deionized water, sodium chloride solution, hydrogen peroxide solution, ethanol solution, phosphate buffer solution and hydrochloric acid solution; The working gas includes one or more mixed gases selected from the group consisting of air, nitrogen, argon and helium.

8. A method for preparing activated water based on water curtain plasma, characterized in that: The activated water preparation device according to any one of claims 1 to 7 comprises: When the potential difference between the high-voltage electrode and the ground electrode reaches a threshold, the working gas input from the gas inlet is broken down at the high-voltage electrode, causing gas discharge and generating plasma; When the aqueous solution pumped into the water tank by the water pump fills the water tank, it overflows from the water curtain outlet and flows directionally along the restriction groove to form a water curtain; The active particles in the plasma enter the surrounding water curtains to obtain activated aqueous solution, which flows out from the aqueous solution outlet of the water tank.

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