A plasma generator and an activated water preparation system

Abstract

This utility model relates to the field of plasma technology and discloses a plasma generating device and an activated water preparation system. The plasma generating device includes a discharge electrode, a grounding electrode, a plasma generating tube, a conductive component, and a frame. One end of the plasma generating tube is mounted on the frame, and the conductive component is mounted on the plasma generating tube. The discharge electrode penetrates the interior of the frame, with one end connected to the output terminal of a power supply and the other end located in the center of the plasma generating tube. The grounding electrode is mounted on the conductive component. An air inlet is provided on the frame, and the air inlet communicates with the plasma generating tube through the frame. This utility model has a simple structure, wide adaptability, and low cost. It can operate stably for a long time and has broad application prospects, achieving good industrialization and promotion value.

Description

Technical Field

[0001] This utility model belongs to the field of plasma technology, specifically relating to a plasma generating device and an activated water preparation system. Background Technology

[0002] Plasma, as the fourth state of matter, contains a large number of high-energy electrons, ions, free radicals, and photons, making it widely used in fields such as material surface modification, environmental remediation, biomedicine, and agricultural engineering. In recent years, with the development of low-temperature atmospheric pressure plasma technology, it has been discovered that the interaction of plasma with liquids can produce a special liquid, namely plasma-activated water (PAW). The active substances in the water endow PAW with significant bactericidal and disinfecting properties, as well as the ability to promote biological activity and improve the environment, demonstrating its enormous application potential in agriculture, medicine, and food safety.

[0003] However, current devices for preparing plasma-activated water still have some shortcomings: 1) Most existing devices use needle-plate discharge, dielectric barrier discharge (DBD), corona discharge, etc., focusing only on generating plasma at the tube opening or outside the tube. These discharge modes have small discharge volumes and limited interaction areas between plasma and liquid under normal pressure, resulting in low reaction efficiency and preventing large-scale application; 2) Existing devices have simple structures, mostly using direct contact between static water and plasma, but the limited gas-liquid interface area hinders the transport of active species, resulting in insufficient quantity entering the liquid phase; 3) The long-term operational stability of the devices is poor, affecting the sustainability of the preparation process.

[0004] Improvements have been attempted, but due to limitations in equipment, cost, and operating conditions, a universal device that balances efficiency, stability, and controllability has not yet been developed.

[0005] In summary, existing plasma-activated water preparation devices generally suffer from low energy efficiency, unreasonable structure, and poor stability, failing to meet current practical needs. Therefore, there is an urgent need to develop a highly efficient, stable, and controllable plasma-activated water preparation device. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a plasma generating device and an activated water preparation system. The device provided by this invention effectively increases the plasma discharge area, enabling the generation of more active substances per unit time, increasing the contact area between the plasma and the liquid, and improving reaction efficiency. This device has a simple structure, low cost, and stable discharge, enabling efficient, stable, and large-scale applications.

[0007] This utility model provides the following technical solution: In a first aspect, a plasma generating device is provided, including a discharge electrode, a grounding electrode, a plasma generating tube, a conductive component, and a frame; One end of the plasma generating tube is mounted on the frame, and the conductive component is mounted on the outer surface of the plasma generating tube; The discharge electrode penetrates the interior of the skeleton, with one end connected to a power source and the other end located in the center of the plasma generating tube. The grounding electrode is mounted on the conductive component; The frame is provided with an air inlet, which is connected to the plasma generating tube through the frame.

[0008] In the above technical solution, the plasma generating device is used to provide a place for plasma generation. The conductive component is connected to the grounding electrode. The frame integrates the discharge electrode, the gas inlet and the plasma generating tube into one unit to realize the transmission of working gas inside the plasma generating tube. After power is turned on and gas is supplied, an electric field is generated inside the plasma generating tube, which induces the generation of plasma. In addition, plasma is also generated at the tube opening of the plasma generating tube, which greatly increases the discharge area and improves the working efficiency of the plasma generating device.

[0009] Furthermore, the conductive component includes a first conductive medium and a second conductive medium. The first conductive medium is provided in multiple forms, and each first conductive medium is uniformly wound around the plasma generating tube. The second conductive medium connects each first conductive medium and connects to a grounding electrode.

[0010] Furthermore, the width of the first conductive medium is 1~10 mm, and the winding spacing of the first conductive medium is 1-4 mm.

[0011] In the above technical solution, the combination of the first conductive medium and the second conductive medium can ensure that the plasma discharge state can be observed in the gap of the conductive components, and can be applied to emission spectroscopy, ICCD cameras, etc.; during use, it is easy to assemble, easy to wind, and can be quickly replaced.

[0012] Furthermore, the distance between the wall of the plasma generating tube and the discharge electrode is 1~2 mm.

[0013] Furthermore, the plasma generating tube has a length of 100 mm and a thickness of 1 mm.

[0014] Furthermore, the plasma generating tube is a quartz tube.

[0015] Furthermore, the discharge electrode is a tungsten rod.

[0016] Furthermore, the air inlet is connected to an air pipe, and the diameter of the air inlet is 6 mm.

[0017] In the above technical solution, the air inlet can be connected to a variety of working gases, and the control repeatability is high and the stability is good, which can meet the application scenarios of different gases.

[0018] Furthermore, the conductive component is copper foil.

[0019] In the above technical solution, both the first and second conductive media of the conductive component are made of copper foil. Copper foil has good conductivity and stable material properties, and can maintain good stability during long-term use.

[0020] In a second aspect, a plasma-activated water preparation system is provided, comprising the plasma generating apparatus described in any one of the first aspects.

[0021] Furthermore, it also includes a water storage tank, wherein the plasma generating tube of the plasma generating device does not contact the water surface in the water storage tank.

[0022] Compared with the prior art, the beneficial effects of this utility model are: (1) In the plasma generating device of this embodiment, one end of the discharge electrode is connected to the power supply, and the other end is located in the center of the plasma generating tube; the conductive component is installed on the plasma generating tube, and the grounding electrode is connected to the conductive component. When the power supply is applied, the discharge electrode is energized, and an electric field is generated inside the plasma generating tube. After the working gas is introduced, plasma can be generated not only at the tube opening and outside the plasma generating tube, but also inside it. Compared with the traditional discharge device, the discharge area is increased, the active material generated per unit time is increased, the active material yield is abundant, and the preparation efficiency of PAW can be greatly improved. (2) The plasma-activated water preparation system provided by this utility model is compatible with both surface and underwater discharge. By adding conductive components to the plasma generating tube, an electric field is generated inside the plasma generating tube, which induces the generation of plasma. Plasma is generated at the tube opening and inside the tube, increasing the discharge area. The generated plasma can not only interact with the water surface, but also with water molecules below the water surface. This increases the effective contact area between the plasma and the liquid phase, promotes the transport of active substances in the liquid phase, and provides more reaction space for active substances, thereby improving the generation efficiency of active substances in water. (3) This utility model can be used with various types of plasma power supplies and is suitable for different working environments; the device provided by this utility model has a simple structure, the materials used are easy to obtain, it is low-cost and has stable discharge, and can achieve long-term stable operation. (4) The device provided by this utility model is flexible in design and highly adaptable. It can be used for small-scale laboratory research and can also be extended to industrial-grade continuous preparation, realizing the application of plasma-activated water in different fields. It has good industrialization and promotion value. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the plasma generating device according to Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the gas transmission structure of Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the plasma-activated water preparation system according to Embodiment 2 of this utility model; Figure 4 The plasma activated water preparation system of Embodiment 3 of this utility model uses discharge diagrams of different working gases: (a) Argon discharge in air; (b) Argon discharge to prepare PAW; (c) Air discharge to prepare PAW.

[0024] The following are marked in the diagram: 1. Discharge electrode; 2. Grounding electrode; 3. Plasma generating tube; 4. Conductive component; 41. First conductive medium; 42. Second conductive medium; 5. Frame; 6. Air inlet; 7. Power supply; 8. Water tank; 9. Gas cylinder; 10. Air pump; 11. First channel; 12. Second channel. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0026] It should be noted that in the description of this utility model, the terms "front", "rear", "left", "right", "up", "down", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, 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 defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0028] Example 1

[0029] like Figure 1As shown, this embodiment provides a plasma generating device, including a discharge electrode 1, a grounding electrode 2, a plasma generating tube 3, a conductive component 4, and a frame 5.

[0030] The discharge electrode 1 penetrates the interior of the frame 5. One end of the discharge electrode 1 is connected to the output terminal of the power supply 7, which is a plasma power supply. The other end is located in the center of the plasma generating tube 3. In this embodiment, the discharge electrode 1 is a tungsten rod high-voltage electrode. The tungsten rod is 200 mm long and 5 mm in diameter. Tungsten is a chemically stable metal that is not easily oxidized. Except for a mixture of hydrofluoric acid and concentrated nitric acid, it is not corroded by common acid, alkali, oxidizing agents, or other chemical reagents. At room temperature, tungsten does not react with air or water, maintaining stable chemical properties and enabling long-term use. This improves the long-term stability of the plasma generating device. The grounding electrode 2 is fixed on the conductive component 4 for direct connection to the ground wire.

[0031] One end of the plasma generating tube 3 is mounted on the frame 5, and the other end is used to emit plasma. In this embodiment, both the plasma generating tube 3 and the frame 5 are made of insulating materials. The plasma generating tube 3 is made of quartz tube with a length of 100 mm, a thickness of 1 mm, and an inner diameter of 7 mm. The diameter of the tungsten rod is 2 mm smaller than the inner diameter of the quartz tube. A gap of 1 mm is left between the plasma generating tube 3 and the discharge electrode 1.

[0032] The conductive component 4 is mounted on the outer surface of the plasma generating tube 3. The conductive component 4 includes a first conductive medium 41 and a second conductive medium 41. Multiple first conductive media 41 are provided, and each first conductive medium 41 is uniformly wound on the plasma generating tube 3. The second conductive medium 42 connects each first conductive medium 41 and is simultaneously connected to the grounding electrode 2.

[0033] In this embodiment, all conductive components 4 are made of copper foil. Copper has the advantage of good conductivity and does not come into contact with plasma or water, allowing for long-term use. In this embodiment, the first conductive medium 41 is a ring-shaped copper foil, and multiple first conductive media 41 are respectively sleeved on the plasma generating tube 3. The second conductive medium 42 is a strip-shaped copper foil used to connect the multiple first conductive media 41 and connect to the grounding electrode 2. The copper foil used for the first conductive medium 41 has a width of 5 mm, and the winding spacing between the first conductive media 41 is 1.5 mm. In some embodiments, the winding spacing between the first conductive media 41 is set to 2 mm. The combination of the first conductive media 41 and the second conductive media 42 ensures that the plasma discharge state can be observed in the gaps of the conductive components 4, which can be applied to emission spectroscopy, ICCD cameras, etc. In use, the conductive components 4 are easy to assemble, easy to wind, and can be quickly replaced.

[0034] In some embodiments, the first conductive medium 41 can be wound in multiple layers, such as three layers, on the plasma generating tube 3. Even if the plasma generating device is used for a long time, only the outermost copper foil will oxidize, while the inner layers can always remain in a new state. This further improves the durability and long-term stability of the plasma generating device.

[0035] The frame 5 is provided with an air inlet 6. In this embodiment, the diameter of the air inlet 6 is 6 mm. The air inlet 6 can be connected to different types of gas cylinders 9 through the air pump 10 to meet the needs of different application scenarios.

[0036] like Figures 1-2 As shown, in this embodiment, the skeleton 5 has a first channel 11 and a second channel 12 inside. The second channel 12 has three layers of different diameters, which correspond to the installation of discharge electrodes 1 and plasma generating tubes 3 of different sizes.

[0037] like Figures 1-2 As shown, the frame 5 integrates the discharge electrode 1, the plasma generating tube 3, and the air inlet 6 into a single unit. In this embodiment, a first channel 11 is provided at the air inlet 6 of the frame 5 where it contacts the interior of the frame 5. After the gas enters the frame 5 through the air inlet 6, it diffuses out through the first channel 11 and enters the second channel 12. The second channel 12 has gaps between itself and both the discharge electrode 1 and the plasma generating tube 3, allowing the working gas to diffuse. The working gas diffuses along the gap between the frame 5 and the discharge electrode 1 and enters the plasma generating tube 3 along the second channel 12. In some embodiments, to prevent gas leakage, the gap between the discharge electrode 1 and the frame 5 at the end where the discharge electrode 1 contacts the power supply 7 can be sealed with adhesive.

[0038] In the above device, after the power supply 7 is turned on, the discharge electrode 1 discharges. Due to the presence of the conductive component 4 connected to the ground electrode 2, an electric field is generated in the gap between the discharge electrode 1 and the plasma generating tube 3. This electric field can ionize the gas in the gap, thereby forming plasma in the entire plasma generating tube 3. At the same time, plasma is also generated at the opening of the plasma generating tube 3.

[0039] The plasma generating device provided in this embodiment can generate plasma not only inside the plasma generating tube 3, but also at the tube opening, effectively increasing the plasma discharge area and enabling the generation of more active materials per unit time.

[0040] Plasma is sometimes called plasma activated gas (PAG). These activated gases can be directly introduced into water or above the water surface to generate PAW.

[0041] Example 2

[0042] This embodiment provides a plasma-activated water preparation system, which includes a plasma generator as provided in Embodiment 1, and a water storage tank 8.

[0043] like Figure 3 As shown, the plasma generating tube 3 of the plasma generating device does not contact the water surface in the water storage tank 8, but is placed above the water surface.

[0044] In this embodiment, the water reservoir 8 is a beaker. Gas cylinder 9 enters the plasma generator via gas pump 10. After power is applied to the plasma generator 7, plasma is generated inside or at the outlet of the plasma generator tube 3. When the plasma generator is positioned above the water surface, the generated plasma is released at the outlet of the plasma generator tube 3 and impacts the water surface, activating and generating PAW (Potentially Arsenic Flooding). The plasma also directly contacts water molecules inside the liquid, activating and generating PAW. The working gas can be argon, air, or other gases. In some embodiments, when argon is used, the water surface is 10-20 mm below the plasma generator tube 3, preferably 15 mm. In some embodiments, when air is used, the plasma will not be ejected, therefore the distance from the outlet to the water surface needs to be reduced to generate discharge; the water surface is 1-3 mm below the plasma generator tube 3, preferably 2 mm.

[0045] The plasma-activated water preparation system provided in this embodiment is compatible with both surface and underwater discharge, avoiding the problems of limited liquid-phase interface area and obstructed transport of active species at the water surface, effectively enhancing the effective area of ​​gas-liquid interface contact and improving the generation efficiency of PAW.

[0046] Example 3

[0047] This embodiment uses the plasma generator from Embodiment 1. The working electrode 1 is a tungsten rod high-voltage electrode. A sinusoidal high voltage with a peak value of 7 kV and a frequency of kHz is applied to the working electrode 1. Argon (Ar) is used as the working gas, and the gas flow rate is 3 standard liters per minute (slm). Figure 4 As shown in (a), a plasma jet of approximately 10 mm is ejected from the outlet of the plasma generator. Figure 4 As shown in (b), distilled water was stored in a beaker, and the same test parameters were used to discharge the distilled water. It can be seen that the plasma generated by the plasma generator directly bombarded the water surface, producing a filamentary discharge phenomenon. Figure 4 As shown in (c), distilled water is stored in a beaker. Using the same test parameters, the working gas is replaced with air, and the distilled water is subjected to discharge treatment. It can be seen that a strong filamentary discharge is formed between the inlet of the plasma generating tube 3 and the water surface.

[0048] It can be seen that under the three different plasma discharge conditions, the plasma can not only be ejected from the opening of the plasma generating tube 3, but also fill the gap inside the plasma generating tube 3. The large area of ​​plasma generates a large amount of PAG and flows to the surface of the water, promoting the formation of PAW. At the same time, there is a discharge phenomenon between the plasma and the water surface, which further enhances the generation efficiency of PAW.

[0049] The plasma generator provided by this invention has a simple structure, wide adaptability, and can operate stably for a long time. By increasing the plasma discharge area, it generates more active materials per unit time, thereby improving the preparation efficiency of PAW (Polymer Alternating Wave Wheat). This invention can be used with various types of plasma power supplies, is compatible with different working gases, and is suitable for different working environments. This invention has a wide range of applications. In environmental remediation, it can be used to efficiently degrade water pollutants; in the biomedical field, it can achieve non-destructive disinfection and promote cell repair; and in the agricultural field, it can be used to prepare activated water to improve seed germination rate and crop resistance, thus possessing good industrialization and promotion value.

[0050] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A plasma generating device, characterized in that, It includes a discharge electrode (1), a grounding electrode (2), a plasma generating tube (3), a conductive component (4), and a frame (5); One end of the plasma generating tube (3) is mounted on the frame (5), and the conductive component (4) is mounted on the outer surface of the plasma generating tube (3); The discharge electrode (1) penetrates the interior of the skeleton (5), one end of the discharge electrode (1) is connected to the power supply (7), and the other end is located in the center of the plasma generating tube (3); The grounding electrode (2) is mounted on the conductive component (4); The frame (5) is provided with an air inlet (6), which is connected to the plasma generating tube (3) through the frame (5).

2. The plasma generating device according to claim 1, characterized in that, The conductive component (4) includes a first conductive medium (41) and a second conductive medium (42). There are multiple first conductive media (41), and each first conductive medium (41) is uniformly wound on the plasma generating tube (3). The second conductive medium (42) connects each first conductive medium (41) and connects to the ground electrode (2).

3. The plasma generating apparatus according to claim 2, characterized in that, The width of the first conductive medium (41) is 1~10 mm, and the winding spacing of the first conductive medium (41) is 1~4 mm.

4. The plasma generating device according to claim 1, characterized in that, The distance between the wall of the plasma generating tube (3) and the discharge electrode (1) is 1~2 mm.

5. The plasma generating apparatus according to claim 1, characterized in that, The plasma generating tube (3) is 100 mm long and 1 mm thick; And / or, the plasma generating tube (3) is a quartz tube.

6. The plasma generating apparatus according to claim 1, characterized in that, The discharge electrode (1) is a tungsten rod.

7. The plasma generating device according to claim 1, characterized in that, The air inlet (6) is connected to an air pipe, and the diameter of the air inlet (6) is 6 mm.

8. The plasma generating apparatus according to claim 1, characterized in that, The conductive component (4) is a copper foil.

9. A plasma-activated water preparation system, characterized in that, Includes the plasma generating apparatus according to any one of claims 1 to 8.

10. The plasma-activated water preparation system according to claim 9, characterized in that, It also includes a water storage tank (8), wherein the plasma generating tube (3) of the plasma generating device does not contact the water surface in the water storage tank (8).

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