Low-temperature plasma activated water preparation device

Abstract

The invention relates to the technical field of plasma liquid, in particular to a low-temperature plasma activated water preparation device. The low-temperature plasma activated water preparation device comprises a reaction cavity, and the reaction cavity at least comprises four ports which are connected with a water inlet pipe, a water outlet pipe and two electrodes respectively; the water inlet direction and the water outlet direction of the reaction cavity are at least changed by 90 degrees in the reaction cavity. The invention aims to solve the technical problems of reducing excitation electric field intensity of discharge in liquid, realizing stable generation of discharge plasma in the liquid under a low electric field condition, improving scene adaptability and improving corrosion resistance and maintenance convenience of an electrode in the prior art.

Description

Technical Field

[0001] This invention relates to the field of plasma liquid technology, and in particular to a low-temperature plasma-activated water preparation apparatus. Background Technology

[0002] Low-temperature plasma-activated water is rich in substances such as nitrite ( ), nitrates ( ), hydrogen peroxide ) and ozone ( Active substances such as activated water possess excellent properties such as high-efficiency sterilization, pollutant degradation, and crop growth promotion, and have been widely used in various fields such as industrial wastewater treatment, agricultural irrigation, medical disinfection, and food processing. With the upgrading of environmental protection requirements, the urgent need for improving agricultural quality and efficiency, and the pursuit of high-safety water quality in the medical and health field, the market has placed higher demands on the efficiency of activated water preparation, cost control, control of the content of special active substances, and adaptability to various scenarios.

[0003] Currently, the main methods for preparing activated water include surface discharge and intra-liquid discharge. Surface discharge equipment is simple and easy to trigger, but its gas-liquid interface contact mode causes a large amount of active material to escape with the gas phase, resulting in extremely low utilization. Furthermore, the reaction is easily affected by external environmental interference, leading to poor stability of the activated water. Intra-liquid discharge, on the other hand, achieves high retention and high conversion efficiency due to the advantage of in-situ generation of active material, making it suitable for large-scale industrial applications. However, traditional intra-liquid discharge requires extremely high electric field strength, resulting in high energy consumption and poor discharge stability. Additionally, the generated active material is uncontrollable, leading to poor adaptability to various scenarios. Furthermore, the electrodes are susceptible to corrosion and wear, making maintenance difficult and costly.

[0004] Therefore, how to reduce the excitation electric field intensity of liquid discharge, achieve stable generation of liquid discharge plasma under low electric field conditions, and at the same time improve the adaptability of the scenario and enhance the corrosion resistance and maintenance convenience of the electrode has become a key technical problem that needs to be overcome in the current technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a low-temperature plasma activated water preparation device. It aims to solve the technical problems in the prior art of reducing the excitation electric field intensity of liquid discharge, achieving stable generation of liquid discharge plasma under low electric field conditions, and improving scene adaptability and enhancing the corrosion resistance and maintenance convenience of the electrodes.

[0006] To achieve the above objectives, the present invention proposes a low-temperature plasma activated water preparation device, comprising a reaction chamber, wherein the reaction chamber includes at least four ports, which are respectively connected to an inlet pipe, an outlet pipe, and two electrodes; the inlet and outlet directions of the reaction chamber undergo at least a 90° change within the reaction chamber.

[0007] Preferably, the water outlet port of the reaction chamber is sealed and connected to the water outlet pipe via a third quick connector; the reaction chamber has an L-shaped pipe wall; and the reaction chamber is made of quartz tube material.

[0008] Preferably, the water inlet port of the reaction chamber is detachably and sealed to the water outlet of the water jet via a second quick connector; the water jet is detachably connected to a water inlet pipe via a first quick connector.

[0009] Preferably, the water jet is also connected to an air inlet pipe, and a two-way solenoid valve is provided on the air inlet pipe to control the air intake; the air inlet pipe is connected to the atmosphere or a dedicated air source.

[0010] Preferably, both electrodes are connected to the reaction chamber via quick connectors, and the other ends of the two electrodes are pluggable to high-voltage terminals.

[0011] Preferably, the other end of the two high-voltage terminals is sealed and connected to the output end of an external high-voltage power supply via a high-voltage resistant, breakdown-proof DC silicone high-voltage wire.

[0012] Preferably, the electrode includes an electrode needle, a connector, a sealing ring, epoxy resin potting compound, a connecting cavity, and a high-voltage terminal adapter female; one side of the connecting cavity is connected to the high-voltage terminal adapter female, and the other end is connected to the connector; a sealing ring is provided between the connector and the connecting cavity, epoxy resin potting compound is provided in the connecting cavity, and the electrode needle extends from the chamber of the connecting cavity into the reaction chamber.

[0013] Preferably, the electrode needle is made of cerium-tungsten material; the discharge tip of the electrode needle is processed by precision grinding, and the tip is sharpened to form a sharp discharge end.

[0014] Preferably, the precision grinding process is a vertical grinding process that forms a vertical stripe structure along the axial direction at the tip of the electrode needle; the grinding angle of the electrode needle tip is 22.5°-30°.

[0015] The preferred material is the high-temperature resistant engineering plastic used for insulating the connector; the connection end of the high-voltage terminal adapter female and the electrode pin is interference-fitted.

[0016] Compared with the prior art, the beneficial effects of the low-temperature plasma activated water preparation device provided by the present invention are as follows: 1. The high-speed water jet violently impacts the wall of the L-shaped reaction chamber. This impact causes a sharp change in the direction of fluid flow, creating strong turbulent disturbances and enhancing mass transfer and mixing within the fluid. Furthermore, it triggers a significant cavitation effect, generating localized high-pressure shock waves and a high-temperature environment through the formation and instantaneous collapse of cavitation bubbles. This cavitation effect not only further improves the interaction efficiency between plasma and the fluid medium and enhances the generation of active substances, but also effectively reduces the excitation electric field strength required for liquid-phase plasma discharge, lowering the energy consumption and control complexity of the device, ultimately achieving a significant improvement in the efficiency of plasma activation preparation.

[0017] 2. The water jet injector, combined with a two-way solenoid valve, utilizes the negative pressure field created by the high-speed jet to autonomously draw in gas, achieving switching between "no gas intake" and "gas intake" modes without the need for an air pump. Furthermore, by integrating a multi-way solenoid valve assembly and connecting to different external gas sources, automatic switching between different gas sources can be achieved. The gas-liquid mixing mode (autonomously drawing in gas to form a gas-liquid mixture to prepare activated water) and the pure water mode (pure water flow without a gas source to prepare activated water) can be flexibly switched via the solenoid valve to generate activated water with different active ingredients and concentrations, adapting to different scenarios.

[0018] The features and advantages of the present invention will be described in detail through embodiments and in conjunction with the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the flow direction of the gas-liquid mixing jet system in the low-temperature plasma activated water preparation device, which operates in a gas-liquid mixing mode.

[0020] Figure 2 This is a schematic diagram of the liquid jet system flow direction of the low-temperature plasma activated water preparation device in pure water operation mode.

[0021] Figure 3 This is a schematic diagram of the structure of a low-temperature plasma-activated water preparation device after an explosion.

[0022] Figure 4 This is a cross-sectional view of the reaction chamber structure of a low-temperature plasma-activated water preparation device.

[0023] Figure 5 This is a schematic diagram of the electrode module structure.

[0024] Figure 6 This is a cross-sectional view of the electrode module structure.

[0025] Figure 7 This is a photograph of plasma discharge in the reaction chamber of Example 1.

[0026] Figure 8 This is a photograph of plasma discharge in the reaction chamber of Example 2.

[0027] In the diagram: 1. First high-voltage terminal block; 2. First air inlet pipe; 3. Two-way solenoid valve; 4. Second air inlet pipe; 5. Water inlet pipe; 6. First quick connector; 7. Water jet injector; 8. Second quick connector; 9. Second high-voltage terminal block; 10. First electrode; 11. Fourth quick connector; 12. Reaction chamber; 13. Fifth quick connector; 14. Second electrode; 15. Third quick connector; 16. Water outlet pipe; 101. First electrode needle; 102. Connector; 103. Sealing ring; 104. Epoxy resin potting compound; 105. Connecting cavity; 106. High-voltage terminal block adapter female; 141. Second electrode needle. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0029] In the description of this invention, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0030] In the description of this invention, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] This invention relates to a low-temperature plasma activated water preparation device, comprising a first high-voltage terminal block 1, a first air inlet pipe 2, a two-way solenoid valve 3, a second air inlet pipe 4, a water inlet pipe 5, a first quick connector 6, a water jet injector 7, a second quick connector 8, a second high-voltage terminal block 9, a first electrode 10, a fourth quick connector 11, a reaction chamber 12, a fifth quick connector 13, a second electrode 14, a third quick connector 15, and a water outlet pipe 16.

[0033] The high-voltage power supply circuit of this device achieves precise docking with the electrode assembly through two sets of identical high-voltage terminals, ensuring the stable transmission of high-voltage electrical energy required for plasma discharge. Specifically, the tail end of the first high-voltage terminal 1 is reliably electrically connected to one output terminal of an external high-voltage power supply via a high-voltage-resistant, breakdown-proof DC silicone high-voltage wire. Its front male connector adopts a standardized quick-plug self-locking structure design, which can be precisely aligned with and self-locked to the female connector at the tail end of the second electrode 14, thereby establishing a stable conductive path between one end of the high-voltage power supply and the second electrode 14.

[0034] Correspondingly, the tail end of the second high-voltage terminal 9 is also sealed and connected to the other output end of the external high-voltage power supply through a high-voltage resistant and breakdown-proof DC silicone high-voltage wire. Its front male end and the female end of the first electrode 10 form a matching plug-in fit, and the two are tightly connected by means of a self-locking mechanism.

[0035] The modular design of the two sets of high-voltage terminals not only enables rapid connection and convenient disconnection between the two ends of the high-voltage power supply and the first electrode 10 and the second electrode 14 respectively, but also effectively resists interference from operating conditions such as vibration and fluid impact during device operation through a self-locking structure, avoiding power supply failures such as poor contact and loose wiring, and ensuring the continuity and reliability of high-voltage power supply. At the same time, this quick-plug self-locking connection method significantly simplifies the electrode and power supply wiring process during device assembly. In subsequent equipment maintenance, electrode replacement, or repair work, the terminals and electrodes can be disassembled and reinstalled without the need for special tools, significantly reducing the difficulty of operation and maintenance, improving the assembly efficiency and life-cycle convenience of the device, and adapting to the needs of large-scale production and practical application scenarios.

[0036] The intake pipe includes a first intake pipe 2 and a second intake pipe 4, wherein one end of the first intake pipe 2 can be selectively connected directly to the atmosphere or connected to a dedicated gas source such as oxygen. Argon (Ar) and nitrogen A gas cylinder is used to prepare plasma-activated water with different active substances. The other end of the first air inlet pipe 2 is connected to the input end of the two-way solenoid valve 3, and the output end of the two-way solenoid valve 3 is connected to the air inlet of the water jet injector 7 through the second air inlet pipe 4.

[0037] The two-way solenoid valve 3 is used to control the air passage between the first air inlet pipe 2 and the second air inlet pipe 4, thereby realizing the air passage control between the external air source and the air inlet of the water jet 7, and ensuring the precise regulation of the air supply.

[0038] One end of the inlet pipe 5 is connected to the outlet of an external water supply pump, and the other end is detachably connected to the inlet of the water jet injector 7 via a first quick connector 6, forming a stable water supply path. In operation, the external water source is steadily pumped into the plasma activated water preparation device through the inlet pipe 5 under the power drive of the water supply pump, providing a continuous and controllable liquid medium for the subsequent plasma activation reaction.

[0039] The water outlet of the water jet 7 is sealed to the water inlet of the reaction chamber 12 via the second quick connector 8, forming a delivery path.

[0040] When the device is in gas-liquid mixing mode, the two-way solenoid valve 3 is in the open state. External water, driven by the water supply pump, is pumped into the inlet of the water jet injector 7 through the inlet pipe 5. The high-pressure water flow rapidly increases in velocity as it passes through the constriction section inside the water jet injector. Based on Bernoulli's principle, a significant local negative pressure vacuum zone is formed at the throat region at the end of the constriction section. This negative pressure generates a continuous adsorption force through the air inlet of the water jet injector 7. External air sources such as air and oxygen... Argon (Ar) and nitrogen After being automatically drawn into the throat area through the second air inlet pipe 4, the high-speed water flow and the drawn-in gas undergo sufficient turbulent mixing and shearing in the throat and diffuser section, forming a uniformly dispersed gas-liquid mixture. Finally, it is ejected at high speed through the outlet of the water jet 7 and sprayed into the reaction chamber 12, providing a stable and uniform gas-liquid two-phase reaction medium for the subsequent plasma activation reaction.

[0041] When the device is in pure water operation mode, the two-way solenoid valve 3 is closed, cutting off the external air supply. At this time, the external water source is pumped into the water jet injector 7 through the inlet pipe 5, where it undergoes a rapid pressurization and acceleration at the internal contraction section and throat, forming a high-speed pure water jet that is ejected from the outlet and directly enters the reaction chamber 12. The high-speed pure water jet violently impacts the L-shaped pipe wall of the reaction chamber 12. This impact causes a sharp change in the direction of fluid flow, creating strong turbulent disturbance and enhancing mass transfer and mixing within the fluid. Furthermore, it triggers a strong cavitation effect. The instantaneous high-pressure shock wave and localized high-temperature environment generated during cavitation bubble collapse effectively reduce the excitation electric field strength required for liquid-phase discharge, thereby significantly improving the preparation efficiency of plasma-activated water and reducing nitrite ( The concentration of active substances such as ) generated.

[0042] The reaction chamber 12 is made of quartz tube material. The excellent dielectric insulation, high light transmittance, chemical inertness and extreme environment tolerance of quartz tube can ensure the stable discharge of plasma in the chamber and avoid the material from reacting with active substances or releasing impurities. At the same time, with the help of its high light transmittance combined with external sensors, the discharge situation in the reaction chamber can be detected in real time, which can effectively improve the preparation efficiency, purity and safety of activated water.

[0043] The reaction chamber 12 adopts an integrated four-way structure design, with its four ports corresponding to the water inlet port, water outlet port, and two electrode mounting ports, respectively. Each port is connected to the outside via quick connectors. Specifically, the water inlet port of the reaction chamber 12 is detachably and sealed to the water outlet of the water jet injector 7 through the second quick connector 8, forming a stable input path for gas-liquid mixed flow or high-speed pure water jet; the water outlet port of the reaction chamber 12 is sealed to the water outlet pipe 16 through the third quick connector 15, constructing an outlet path for activated water.

[0044] The water inlet and outlet directions of the reaction chamber 12 undergo at least a 90° directional change within the chamber. Furthermore, the water inlet and outlet passages of the reaction chamber 12 are arranged in an L-shaped vertical corner configuration, creating a 90° angle between the water inlet and outlet directions. The remaining two oppositely positioned ports are mounting holes for the first electrode needle 101 and the second electrode needle 141. The electrode needles, including the first electrode needle 101 and the second electrode needle 141, are used to assemble plasma discharge electrode assemblies. The axis of the electrode mounting holes is spatially perpendicular to the axis of the L-shaped corner of the water inlet and outlet passages, ensuring precise matching between the electrode discharge region and the fluid flow region, and ensuring efficient application of plasma energy to the fluid within the chamber.

[0045] During operation, the high-speed jet of fluid gas-liquid mixture or pure water jet output from the water jetter 7 is injected into the reaction chamber 12 through the water inlet passage, and violently collides with the chamber wall at the L-shaped corner. This impact causes a sharp change in the direction of fluid velocity, creating strong turbulent disturbance and enhancing the mass transfer and mixing effect within the fluid. Furthermore, it triggers a significant cavitation effect, generating localized high-pressure shock waves and a high-temperature environment through the generation and instantaneous collapse of cavitation bubbles. This cavitation effect not only further improves the interaction efficiency between plasma and the fluid medium and enhances the generation of active substances, but also effectively reduces the excitation electric field strength required for liquid-phase plasma discharge, lowering the energy consumption and control difficulty of the device, ultimately achieving a significant improvement in the efficiency of plasma activation preparation.

[0046] The two electrodes connected to the left and right sides of the reaction chamber 12 are a first electrode 10 and a second electrode 14 with identical structures, and adopt a modular design, including a first electrode needle 101 and a second electrode needle 141, a connector 102, a sealing ring 103, epoxy resin potting compound 104, a connecting cavity 105, and a high-voltage terminal adapter female 106. The high-voltage terminal adapter female 106 is connected to one side of the connecting cavity 105, and the connector 102 is connected to the other end. A sealing ring 103 is provided between the connector 102 and the connecting cavity 105. Epoxy resin potting compound 104 is provided inside the connecting cavity 105, and the electrode needle extends from the chamber of the connecting cavity 105 into the reaction chamber 12.

[0047] The first electrode needle 101 and the second electrode needle 141 are made of cerium-tungsten material. This material has both ultra-high melting and boiling points, and can withstand the instantaneous high temperature and high pressure environment during the discharge process. It has stable chemical properties and excellent resistance to strong oxidizing active substances in the activated water system. It has low electron work function, which can effectively reduce the electric field excitation threshold of discharge in liquid. It has excellent mechanical strength and erosion resistance, which can significantly reduce physical losses, thereby improving the durability and discharge stability of the electrode.

[0048] The discharge tips of the first electrode needle 101 and the second electrode needle 141 are processed by precision grinding. After grinding, the tips are formed into sharp discharge ends. The grinding angle of the electrode needle tips is 22.5°-30°. Preferably, the grinding angle is 22.5° or 30°. This angle range allows for a reasonable electric field concentration effect at the electrode tips, effectively reducing the excitation threshold of plasma discharge and ensuring a stable and continuous discharge process. 22.5° or 30° yields the best results. Furthermore, the grinding process preferably employs a vertical grinding process. This process forms a vertical stripe structure along the axial direction at the tips of the first electrode needle 101 and the second electrode needle 141, reducing the charge accumulation blind zone during tip discharge, making the electric field distribution more uniform, and avoiding tip ablation or discharge instability caused by excessively strong local electric fields.

[0049] The connector 102, as a key connecting component between the electrode assembly and the reaction chamber 12, is preferably made of insulating and high-temperature resistant engineering plastics such as bakelite or nylon. The outer diameter of the connector 102 is precisely matched with the inner cavity of the quick connector at the electrode mounting hole of the reaction chamber 12 to ensure the sealing between the connector 102 and the inner cavity of the quick connector after the electrode assembly is inserted into the quick connector.

[0050] The connecting cavity 105 serves as the core protection and insulation component of the electrode assembly. Its material is preferably bakelite or nylon, which are insulating and high-temperature resistant engineering plastics. It is mainly used to cover and protect the connection section between the high-voltage terminal adapter 106 and the first electrode pin 101 and the second electrode pin 141, forming an integrated electrode connection structure.

[0051] The connection end of the high-voltage terminal adapter 106 with the first electrode pin 101 and the second electrode pin 141 adopts a precision interference fit design. The tight fit between the two is achieved through pre-press assembly, which can not only ensure the reliability of electrical connection, but also avoid connection loosening caused by vibration, impact and other working conditions, and ensure the stable transmission of high-voltage power.

[0052] To further enhance the structural stability and insulation sealing of the connection section, the internal cavity of the connection chamber 105 is fully encapsulated with epoxy resin potting compound 104. After curing, the potting compound forms a dense insulating coating layer, which not only completely fixes the connection structure between the high-voltage terminal adapter 106 and the first electrode pin 101 and the second electrode pin 141, resisting the influence of external mechanical stress and environmental factors, but also effectively isolates impurities such as moisture and dust from entering, preventing leakage, short circuits, and other faults in the connection section. At the same time, it improves the corrosion resistance and high-temperature resistance of the overall structure, ensuring the long-term reliable operation of the electrode assembly under complex working conditions.

[0053] This device induces cavitation by impacting the reaction chamber wall with a high-speed water jet, causing water molecules to break down. The instantaneous high-pressure field and strong disturbance environment formed during the collapse of cavitation bubbles effectively create favorable conditions for the ionization process in the liquid. The high-pressure field lowers the ionization energy barrier of the water, while the strong disturbance environment enhances the diffusion and retention of the active substances generated by ionization in the water. The synergistic effect of cavitation and ionization in the liquid significantly increases the concentration and preparation efficiency of active substances in activated water, while reducing system operating energy consumption. This has significant practical and engineering value for promoting the large-scale, low-cost application of activated water technology, aligning with the current development trend of green and environmentally friendly technologies.

[0054] This device features a water jet injector at the front end of the reaction chamber, with a two-way solenoid valve at the air inlet. Utilizing the negative pressure field created by the high-speed jet from the water jet injector, and in conjunction with the on / off control of the two-way solenoid valve, the device can autonomously regulate whether gas is drawn in without the need for an air pump. By switching between no gas intake, gas intake, and different types of gas intake conditions, the generation of active substances in low-temperature plasma-activated water can be effectively controlled.

[0055] Example 1: Gas-liquid mixing working mode When the two-way solenoid valve 3 is in the conducting state, external water is pumped into the inlet of the water jet injector 7 through the inlet pipe 5 under the drive of the water supply pump. When the high-pressure water flows through the contraction section inside the water jet injector, the flow velocity increases sharply. Based on Bernoulli's principle, a significant local negative pressure vacuum zone is formed in the throat area at the end of the contraction section. This negative pressure generates a continuous adsorption force through the air inlet of the water jet injector 7. External air is automatically drawn into the throat area through the second air inlet pipe 4. Without the need for an additional air pump, the high-speed water flow and the drawn-in gas undergo sufficient turbulent mixing and shearing in the throat and diffusion section, forming a uniformly dispersed gas-liquid mixture. Finally, it is ejected at high speed through the outlet of the water jet injector 7 and sprayed into the reaction chamber 12, providing a stable and uniform gas-liquid two-phase reaction medium for the subsequent plasma activation reaction.

[0056] Optionally, the water supply pump has a maximum pressure of 1.24 MPa and a maximum water supply flow rate of 5 L / min.

[0057] Optionally, the second air inlet pipe 4 is connected to an external air source, such as argon, nitrogen, oxygen, or air. In this embodiment, the external air source is air.

[0058] The high-voltage power supply circuit of this device achieves precise docking with the electrode assembly through two sets of identical high-voltage terminals, ensuring the stable transmission of high-voltage electrical energy required for plasma discharge. Specifically, the tail end of the first high-voltage terminal 1 is reliably electrically connected to one output terminal of an external high-voltage power supply via a high-voltage-resistant, breakdown-proof DC silicone high-voltage wire. Its front male connector adopts a standardized quick-plug self-locking structure design, which can be precisely aligned with and self-locked to the female connector at the tail end of the second electrode 14, thereby establishing a stable conductive path between one end of the high-voltage power supply and the second electrode 14.

[0059] Correspondingly, the tail end of the second high-voltage terminal 9 is also sealed and connected to the other output end of the external high-voltage power supply through a high-voltage resistant and breakdown-proof DC silicone high-voltage wire. Its front male end and the female end of the first electrode 10 form a matching plug-in fit, and the two are tightly connected by means of a self-locking mechanism.

[0060] Optionally, the external high-voltage power supply output is AC 10KV, with an operating frequency of 20~50KHz and an output power of 300W.

[0061] When the equipment starts operating, external water enters the reaction chamber through the inlet pipe 5, mixes with the self-inhaled air via the water jet injector 7, and then reacts. After the airflow stabilizes, the electrode power supply activates the gas-liquid mixture within the reaction chamber, generating plasma-activated water due to turbulence, cavitation, and the high-voltage electric field. Finally, the water flows out through the outlet pipe 16.

[0062] Optionally, the external water source is tap water with a capacity of 1.5L; the circulation treatment time is 5 minutes.

[0063] Figure 7 The image shown is a photograph of plasma discharge in the reaction chamber of this embodiment 1.

[0064] In Example 1, hydrogen peroxide was prepared in plasma-activated water (… The test results showed that the content was approximately 10 mg / L.

[0065] In Example 1, the plasma-activated water contained nitrite ( The test results showed that the content was approximately 1.5 mg / L.

[0066] Example 2: Pure Water Working Mode When the device is in pure water operation mode, the two-way solenoid valve 3 is closed, cutting off the external air supply. At this time, the external water source is pumped into the water jet injector 7 through the inlet pipe 5, where it undergoes a rapid pressurization and acceleration at the internal contraction section and throat, forming a high-speed pure water jet that is ejected from the outlet and directly enters the reaction chamber 12. The high-speed pure water jet violently impacts the L-shaped pipe wall of the reaction chamber 12. This impact causes a sharp change in the direction of fluid flow, creating strong turbulent disturbance and enhancing mass transfer and mixing within the fluid. Furthermore, it triggers a strong cavitation effect. The instantaneous high-pressure shock wave and localized high-temperature environment generated during cavitation bubble collapse effectively reduce the excitation electric field strength required for liquid-phase discharge, thereby significantly improving the preparation efficiency of plasma-activated water and reducing nitrite ( The concentration of active substances such as ) generated.

[0067] Optionally, the water supply pump has a maximum pressure of 1.24 MPa and a maximum water supply flow rate of 5 L / min.

[0068] Optionally, the external high-voltage power supply output is AC 10KV, with an operating frequency of 20~50KHz and an output power of 380W.

[0069] When the equipment starts operating, external water is injected into the reaction chamber 12 through the water jet injector 7 from the inlet pipe 5 to carry out the plasma activation reaction. After the circulation pipeline is full of water, the electrode power supply is turned on. Due to turbulence, cavitation effect and high voltage electric field, the liquid in the reaction chamber 12 generates plasma-activated water. Finally, it flows out through the outlet pipe 16.

[0070] Optionally, the external water source is tap water with a capacity of 1.5L; the circulation treatment time is 5 minutes.

[0071] Figure 8 The image shown is a photograph of plasma discharge in the reaction chamber of this embodiment 2.

[0072] In Example 2, hydrogen peroxide was prepared in plasma-activated water (… The test results showed that the content was approximately 15 mg / L.

[0073] In Example 2, the plasma-activated water contained nitrite ( The test results for the content of nitrite were <0.15 mg / L, indicating that almost no nitrite was produced. It can be adapted to application scenarios that require low nitrite content.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-temperature plasma-activated water preparation device, characterized in that: The reaction chamber (12) includes at least four ports, which are respectively connected to the water inlet pipe (5), the water outlet pipe (16), and two electrodes. The water inlet and outlet directions of the reaction chamber (12) are changed by at least 90° within the reaction chamber (12). The water inlet port of the reaction chamber (12) is detachably and sealed to the water outlet of the water jet (7) through the second quick connector (8). The water jet (7) is detachably connected to the water inlet pipe (5) through the first quick connector (6). An air inlet pipe is also connected to the throat of the water jet (7). A two-way solenoid valve (3) is provided on the air inlet pipe to control the air inlet pipe. The air inlet pipe is connected to the atmosphere or a dedicated air source.

2. The low-temperature plasma-activated water preparation device as described in claim 1, characterized in that: The water outlet of the reaction chamber (12) is sealed and connected to the water outlet pipe (16) through a third quick connector (15); the reaction chamber (12) has an L-shaped pipe wall; the reaction chamber (12) is made of quartz tube material.

3. The low-temperature plasma-activated water preparation device as described in claim 1, characterized in that: Both electrodes are connected to the reaction chamber (12) via quick connectors, and the other ends of the two electrodes are pluggable to high-voltage terminals.

4. The low-temperature plasma-activated water preparation apparatus as described in claim 3, characterized in that: The other end of the two high-voltage terminals is sealed and connected to the output end of an external high-voltage power supply via a high-voltage resistant, breakdown-proof DC silicone high-voltage wire.

5. The low-temperature plasma-activated water preparation apparatus as described in claim 4, characterized in that: The electrode includes an electrode needle, a connector (102), a sealing ring (103), epoxy resin potting compound (104), a connecting cavity (105), and a high-voltage terminal adapter female (106); one side of the connecting cavity (105) is connected to the high-voltage terminal adapter female (106), and the other end is connected to the connector (102); a sealing ring (103) is provided between the connector (102) and the connecting cavity (105), epoxy resin potting compound (104) is provided in the connecting cavity (105), and the electrode needle extends from the chamber of the connecting cavity (105) into the reaction chamber (12).

6. The low-temperature plasma-activated water preparation apparatus as described in claim 5, characterized in that: The electrode needle is made of cerium-tungsten material; the discharge tip of the electrode needle is processed by precision grinding, and the tip is sharpened to form a sharp discharge end.

7. The low-temperature plasma-activated water preparation apparatus as described in claim 6, characterized in that: The electrode needle is ground to form a vertical stripe structure along the axial direction at its tip using a vertical grinding process; the grinding angle of the electrode needle tip is 22.5°-30°.

8. The low-temperature plasma activated water preparation apparatus as described in claim 7, characterized in that: The connector (102) is made of insulating high-temperature resistant engineering plastic; the high-voltage terminal adapter (106) is interference-fitted with the electrode needle.

Images