Gas phase discharge device and plasma water disinfection device

Abstract

The utility model belongs to the technical field of plasma activated water preparation, and particularly relates to a gas phase discharge device and a plasma water disinfection device. The plasma water disinfection device comprises a gas-phase discharge device and a gas-liquid discharge device, in the gas-phase discharge device, the precise gap design of a glass tube and an inner electrode is combined with a high-voltage electric field to realize uniform ionization of gas and generate high-concentration active gas; and the gas-liquid discharge device further ionizes the active gas into plasma through bubble dynamic control and high-voltage discharge in water, so that the yield of active substances is greatly increased, and the oxidation disinfection capability of the water body is enhanced. According to the plasma water disinfection device, through gas phase and gas-liquid discharge collaborative design and modular structure optimization, the disinfection efficiency and the equipment reliability are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of plasma-activated water preparation technology, and particularly relates to a gas phase discharge device and a plasma water disinfection device. Background Technology

[0002] Traditional water disinfection technologies mainly rely on chemical agents (such as chlorine and ozone), ultraviolet radiation, or single-form electrical discharge treatment. However, these methods have significant drawbacks in terms of efficiency, safety, and sustainability. For example, chlorination disinfection easily generates carcinogenic byproducts (such as trihalomethanes) and has poor inactivation effects on drug-resistant pathogens (such as Cryptosporidium). Ozone oxidation methods typically involve high equipment costs and energy consumption, and ozone has a short half-life (only 15-30 minutes), requiring real-time preparation and precise dosage control. Ultraviolet light methods have stringent requirements for water quality (such as extremely low turbidity and color) and lack continuous disinfection capabilities, making the treated water susceptible to secondary pollution. Furthermore, the lamps have short lifespans (approximately 10,000 hours), resulting in high replacement and maintenance costs.

[0003] Existing plasma water treatment devices typically employ single-phase gas or liquid discharge, resulting in insufficient mixing of gas and liquid. This leads to inadequate generation of active substances (such as ozone and hydroxyl radicals), and the equipment is also complex in structure, poorly sealed, and susceptible to corrosion. For example, in gas-phase discharge devices, the gas is directly introduced into the liquid after ionization, resulting in low utilization of active gas due to short contact time. In gas-liquid discharge devices, the electrodes are easily corroded by water vapor, and uneven bubble distribution leads to unstable discharge. Furthermore, existing plasma disinfection systems have low integration, with separate gas and liquid phase treatment units, complex piping, and difficulties in heat dissipation and maintenance. Summary of the Invention

[0004] To address the problems existing in the prior art, this utility model provides a gas phase discharge device and a plasma water disinfection device.

[0005] This utility model is achieved through the following technical solution:

[0006] A gas-phase discharge device includes a first end and a second end. A first housing is fixed between the first and second ends, serving as an external electrode. The interior of the first housing is a hollow cavity, within which a glass tube is placed. The glass tube is bonded to the inner wall of the first housing using thermally conductive silicone. The outer diameter of the glass tube is equal to the inner diameter of the first housing. An internal electrode is placed inside the glass tube. An inlet is provided on the first end, and an outlet is provided on the second end. The outer diameter of the internal electrode is 1-2 mm smaller than the inner diameter of the glass tube. When a high-frequency, high-voltage alternating current is applied between the electrodes, the discharge process is modulated by the dielectric layer, forming numerous transient, dispersed micro-discharge channels, rather than a continuous arc.

[0007] Furthermore, the interior of the first and second ends extends inward to form protrusions, which, together with the inner wall of the first or second end, form a limiting groove. The two ends of the inner electrode are engaged within this limiting groove. The limiting groove formed by the protrusions fixes the two ends of the inner electrode, ensuring that the inner electrode is coaxial with the glass tube and avoiding uneven discharge or short circuit risks caused by misalignment. Within the limiting groove, a first sealing gasket is provided between the two ends of the inner electrode and the first or second end. The first sealing gasket fills the gap between the inner electrode and the end, improving sealing performance, preventing gas leakage and the intrusion of external contaminants, and ensuring a clean discharge environment.

[0008] Furthermore, the length of the glass tube is 5-10 mm shorter than the length of the inner electrode, and the length of the inner electrode is 5-15 mm longer than the length of the first shell. The two ends of the inner electrode extend beyond the glass tube but are covered by insulating ends (such as ceramic or engineering plastic). Due to the dielectric shielding effect of the insulating material, an effective electric field cannot be formed between the two ends of the inner electrode and the outer electrode, forcing the discharge to occur only in the annular gap (1-2 mm) in the middle covered by the glass tube. If the inner electrode is the same length as the glass tube and its ends are not completely covered by insulating material, direct discharge between the electrode ends and the outer electrode may occur, forming a concentrated electric arc, causing localized overheating and electrode ablation. Limiting the discharge area ensures that the micro-discharge channels are uniformly distributed in the middle of the glass tube, improving plasma generation efficiency (such as ozone production) or gas activation effect.

[0009] Furthermore, the first and second ends are made of insulating material, the inner electrode is made of corrosion-resistant conductive metal material, and the first housing is made of conductive metal material.

[0010] Furthermore, the second end has a slot, within which an anti-detachment screw is installed to press and hold the glass tube in place. The anti-detachment screw presses the glass tube, bonding it to the thermally conductive silicone to form a redundant fixation, preventing displacement or even breakage of the glass tube during transportation or vibration. The anti-detachment screw is removable, facilitating replacement of the glass tube or maintenance of the internal electrodes without damaging the overall structure.

[0011] Furthermore, the outer side of the first housing is provided with a stepped groove, and an observation hole is provided on the side of the first housing within the stepped groove. A diffuser plate, made of semi-transparent plastic, is installed on the stepped groove. When the device is working, the light emitted by the plasma can pass through the glass tube and illuminate the observation hole, forming an image on the diffuser plate, thereby allowing observation of the device's working status.

[0012] The working principle of the gas phase discharge device is as follows: When the device is working, gas is introduced through the inlet, and the gas phase discharge power source is a high-voltage electric field applied between the shell and the inner electrode, which ionizes the gas between the glass tube and the inner electrode to generate active gas, which is discharged through the outlet hole. The active gas enters the ejector and mixes with water, and then enters the gas-liquid discharge device through the pipeline.

[0013] A gas-liquid discharge device includes a second housing, which is rectangular in shape, hollow inside, and open at both ends. One end of the second housing has a water inlet direct-connection interface, and the other end has a water outlet direct-connection interface. A needle tube support is installed on the top of the second housing, and the needle tube support is mounted on the second housing by bolts. The needle tube support has a through-slot running from top to bottom, with a diameter shorter at the top and longer at the bottom. A discharge needle is placed in the through-slot. The discharge needle includes a needle tip, an externally threaded post, and an insulating tube. One end of the needle tip is inserted into the insulating tube, and the other end of the needle tip is threadedly connected to the externally threaded post. The externally threaded post and the needle tip each have internal cavities that are connected together. The externally threaded post serves as an air inlet, introducing gas into the cavity of the second housing. The needle tip of the discharge needle is one pole of the high-voltage end, and the water inlet direct-connection interface serves as the other pole of the high-voltage end. The externally threaded post of the discharge needle serves as both an air inlet channel (connecting to the needle tip cavity) and a fixing structure for the high-voltage electrode, simplifying the independent installation requirements of the gas path and the electrical circuit and reducing the risk of leakage. The gas passes through the internal cavity of the discharge needle and reaches the insulated tube opening directly. By utilizing the balance between water pressure and gas pressure, a stable group of bubbles is formed at the tube opening, ensuring that the discharge area is concentrated at the gas-liquid interface.

[0014] Furthermore, the discharge needle is fixed by potting glue and needle tube support. The potting glue seals the gap between the discharge needle and the needle tube support, which has the functions of waterproofing, insulation and vibration resistance, and prevents surface creep or electrode displacement during high voltage discharge.

[0015] Furthermore, the needle is made of a corrosion-resistant conductive metal material, such as stainless steel, and the outer diameter of the needle is equal to the inner diameter of the glass tube, while the length of the needle is 2-5 mm shorter than that of the insulating tube.

[0016] Furthermore, the second housing is made of insulating material, such as acrylic; the inlet and outlet straight-through interfaces are made of corrosion-resistant conductive metal material, such as stainless steel.

[0017] When the gas-liquid discharge device is working, water is injected through the inlet port, and the water gradually fills the hollow part of the shell and submerges the discharge needle. Gas is introduced through the cavity of the external threaded column, which is connected to the cavity of the needle. Under the action of air pressure, the water in the needle and the insulating tube is squeezed out and forms bubbles at the opening of the insulating tube.

[0018] The gas-liquid discharge power supply provides a high-voltage electric field to the two poles of the high-voltage end, namely the tip of the discharge needle and the straight-through interface of the water inlet. Water, as a conductor, introduces the voltage of the straight-through interface of the water inlet to the area around the bubble at the opening of the insulating tube. Under the action of the high-voltage electric field, the discharge needle discharges to the water through the bubble. The gas inside the bubble is ionized to form plasma, thus completing the gas-liquid discharge and generating plasma-activated water.

[0019] Plasma-activated water enters the reaction vessel, where it reacts with toxic substances in the water to complete the disinfection process before being discharged.

[0020] A plasma water disinfection device includes a water pump, an ejector, a gas-liquid discharge device, a gas pump, a gas phase discharge device, a gas phase discharge power supply, a gas-liquid discharge power supply, a main control board, and a reaction vessel.

[0021] The air pump's inlet is connected to the housing's inlet via a pipe, and the air pump's outlet is connected to one end of an air passage tee. The other two ends of the air passage tee are respectively connected to a first throttle valve and a second throttle valve. The other end of the first throttle valve is connected to the air inlet of the gas phase discharge device, and the other end of the second throttle valve is connected to the air inlet of the gas-liquid discharge device. The air outlet of the gas phase discharge device is connected to the air inlet of the jet injector.

[0022] The water pump inlet is connected to the housing inlet via a pipeline, the water pump outlet is connected to the jet inlet, the jet outlet is connected to the gas-liquid discharge device inlet, the gas-liquid discharge device outlet is connected to the reaction vessel inlet, and the reaction vessel outlet is connected to the housing outlet.

[0023] The power supply ports of the gas phase discharge power supply and the liquid phase discharge power supply are both connected to the main control board. The high voltage output terminal of the gas phase discharge power supply is connected to the outer electrode and inner electrode of the first housing of the gas phase discharge device. The high voltage output terminal of the gas-liquid discharge power supply is connected to the two poles of the gas-liquid discharge device, namely the needle tip of the discharge needle and the water inlet.

[0024] Furthermore, the plasma water disinfection device includes a shell, which is divided into four areas, upper and lower, separated by a first partition, a second partition, and a third partition. A water pump and an ejector are installed on the bottom plate of the shell. A gas-liquid discharge device is installed on the first partition, and two air pumps are installed on both sides of the gas-liquid discharge device. A gas phase discharge device is installed on the second partition, and a gas phase discharge power supply, a gas-liquid discharge power supply, and a main control board are installed on the third partition. A reaction container is vertically installed on the lower part of the side plate of the shell.

[0025] Furthermore, a cooling fan is provided on the upper part of the side panel of the casing.

[0026] A method for operating a plasma water disinfection device includes the following steps:

[0027] S1. When the device is working, the water pump delivers external water to the ejector through the pipeline, and the air pump introduces external gas. Part of the gas enters the external threaded column of the gas-liquid discharge device, and part of the gas enters the air inlet of the gas phase discharge device.

[0028] S2. After the gas enters the gas phase discharge device, the gas phase discharge power supply applies a high voltage electric field between the first shell and the inner electrode, causing the gas between the glass tube and the inner electrode to ionize and generate active gas, which is discharged through the gas outlet. The active gas enters the gas inlet of the jet injector and mixes with water, and enters the gas-liquid discharge device through the pipeline and the water inlet direct interface.

[0029] S3. As water from the gas-liquid discharge device gradually fills the hollow part of the second shell and submerges the discharge needle, gas entering from the cavity of the external threaded column enters the cavity of the needle. Under the action of air pressure, the water in the needle and the insulating tube is squeezed out and bubbles are formed at the opening of the insulating tube.

[0030] The gas-liquid discharge power supply provides a high-voltage electric field to the tip of the discharge needle and the water inlet through-hole. Water, as a conductor, introduces the voltage of the water inlet through-hole to the area around the bubble at the opening of the insulating tube. Under the action of the high-voltage electric field, the discharge needle discharges to the water through the bubble. The gas inside the bubble is ionized to form plasma, thus completing the gas-liquid discharge and generating plasma-activated water.

[0031] S4. The plasma-activated water from the gas-liquid discharge device enters the reaction vessel through the outlet port, where it reacts with toxic substances in the water to complete water disinfection and discharge.

[0032] Compared with the prior art, the present invention has the following technical effects:

[0033] This invention significantly improves disinfection efficiency and equipment reliability through a synergistic design of gas phase and gas-liquid discharge and modular structure optimization. Specific advantages include:

[0034] (1) In the gas phase discharge device, the precise gap design (1~2mm) between the glass tube and the inner electrode, combined with the high voltage electric field, achieves uniform ionization of the gas and generates a high concentration of active gas.

[0035] (2) The gas-liquid discharge device further ionizes the active gas into plasma through dynamic control of bubbles (gas pressure squeezing water to form bubbles) and high-voltage discharge in water, which greatly increases the production of active substances and enhances the water body's oxidation and disinfection capabilities.

[0036] (3) The outer shell of the disinfection device of this application is divided into power supply, discharge and reaction areas to avoid the risk of cross-contamination between high voltage circuit and water circuit. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the external structure of a gas phase discharge device.

[0038] Figure 2 This is a schematic cross-sectional view of a gas phase discharge device.

[0039] Figure 3This is a schematic diagram of the external structure of a gas-liquid discharge device.

[0040] Figure 4 This is a schematic cross-sectional view of a gas-liquid discharge device.

[0041] Figure 5 This is a schematic diagram of the structure of the discharge needle;

[0042] Figure 6 This is a schematic diagram of the external structure of a plasma sterilization device.

[0043] Figure 7 This is a schematic diagram of the internal structure of a plasma sterilization device.

[0044] In the diagram: 1. Gas phase discharge device; 2. First end; 3. Second end; 4. First housing; 5. Glass tube; 6. Inner electrode; 7. Limiting groove; 8. Slot; 9. Anti-loosening screw; 10. Stepped groove; 11. Soft light plate; 12. Gas-liquid discharge device; 13. Second housing; 14. Water inlet straight-through interface; 15. Water outlet straight-through interface; 16. Needle tube support; 17. Discharge needle; 18. Needle tip; 19. External threaded column; 20. Insulating tube; 21. Water pump; 22. Ejector; 23. Air pump; 24. Gas phase discharge power supply; 25. Gas-liquid discharge power supply; 26. Main control board; 27. Reaction vessel; 28. Cooling fan. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings.

[0046] Example 1

[0047] See Figure 1-2 A gas phase discharge device 1 includes a first end 2 and a second end 3, both made of insulating material. The first end 2 has an air inlet, and the second end 3 has an air outlet. A first housing 4, made of conductive metal, is fixed between the first and second ends 2 and 3, serving as the external electrode. The interior of the first housing 4 is a hollow cavity, within which a glass tube 5 is placed. The glass tube 5 is bonded to the inner wall of the first housing 4 using thermally conductive silicone. The outer diameter of the glass tube 5 is equal to the inner diameter of the first housing 4. An internal electrode 6, made of corrosion-resistant conductive metal, is placed inside the glass tube 5. When a high-frequency, high-voltage alternating current is applied between the electrodes, the discharge process is modulated by the dielectric layer, forming numerous transient, dispersed micro-discharge channels instead of a continuous arc.

[0048] In this embodiment, the interior of the first end 2 and the second end 3 extends inward to form a protrusion. The protrusion and the inner wall of the first end 2 or the second end 3 form a limiting groove 7, and the two ends of the inner electrode 6 are engaged in the limiting groove 7. The limiting groove 7 formed by the protrusion fixes the two ends of the inner electrode 6, ensuring that the inner electrode 6 is coaxial with the glass tube 5, and avoiding the risk of uneven discharge or short circuit caused by misalignment. A first sealing gasket is provided between the two ends of the inner electrode 6 and the first end 2 and the second end 3 in the limiting groove 7. The first sealing gasket fills the gap between the inner electrode 6 and the end, improves the sealing performance, prevents gas leakage and intrusion of external contaminants, and ensures a pure discharge environment.

[0049] In this embodiment, the outer diameter of the inner electrode 6 is 1-2 mm smaller than the inner diameter of the glass tube 5. The length of the glass tube 5 is 5-10 mm shorter than the length of the inner electrode 6, and the length of the inner electrode 6 is 5-15 mm longer than the length of the first shell 4. Both ends of the inner electrode 6 extend beyond the glass tube 5 but are covered by insulating ends. Due to the dielectric shielding effect of the insulating material, an effective electric field cannot be formed between the two ends of the inner electrode 6 and the outer electrode, forcing the discharge to occur only in the 1-2 mm annular gap in the middle covered by the glass tube 5. If the inner electrode 6 is the same length as the glass tube 5 and its ends are not completely covered by insulating material, direct discharge between the electrode ends and the outer electrode may occur, forming a concentrated electric arc, causing localized overheating and electrode ablation. Limiting the discharge area ensures that the micro-discharge channels are uniformly distributed in the middle of the glass tube 5, improving plasma generation efficiency such as ozone production or gas activation effect.

[0050] In this embodiment, the second end 3 is provided with a slot 8, and an anti-detachment screw 9 is installed in the slot 8 to press and hold the glass tube 5. By pressing the glass tube 5 with the anti-detachment screw 9, it is bonded to the thermally conductive silicone to form redundant fixation, preventing the glass tube 5 from shifting or even breaking due to transportation or vibration. The anti-detachment screw 9 is detachable, which facilitates the replacement of the glass tube 5 or the maintenance of the inner electrode 6 without damaging the overall structure.

[0051] In this embodiment, a stepped groove 10 is provided on the outer side of the first housing 4. An observation hole is provided on the side of the first housing 4 within the stepped groove 10. A diffuser plate 11, which is made of translucent plastic, is installed on the stepped groove 10. When the device is working, the light emitted by the plasma can pass through the glass tube 5 and illuminate the observation hole, forming an image on the diffuser plate 11, thereby allowing observation of the device's working status.

[0052] The working principle of the gas phase discharge device 1 is as follows: When the device is working, gas is introduced into the gas inlet, and the gas phase discharge power supply 24 applies a high voltage electric field between the shell and the inner electrode 6, causing the gas between the glass tube 5 and the inner electrode 6 to ionize and generate active gas, which is discharged through the outlet hole. The active gas enters the ejector 22 and mixes with water, and then enters the gas-liquid discharge device 12 through the pipeline.

[0053] Example 2

[0054] Referring to 3-5, a gas-liquid discharge device 12 includes a second housing 13, which is rectangular in shape, hollow inside, and open at both ends. One end of the second housing 13 is equipped with a water inlet direct-connection interface 14, and the other end is equipped with a water outlet direct-connection interface 15. A needle tube support 16 is installed on the top of the second housing 13, and the needle tube support 16 is mounted on the second housing 13 by bolt assemblies. The needle tube support 16 has a through-slot running from top to bottom, with the diameter of the through-slot shorter at the top and longer at the bottom. An internal discharge needle 17 is placed inside. The discharge needle 17 includes a needle tip 18, an externally threaded post 19, and an insulating tube 20. One end of the needle tip 18 is inserted into the insulating tube 20, and the other end of the needle tip 18 is threadedly connected to the externally threaded post 19. The externally threaded post 19 and the needle tip 18 each have a cavity inside, which are connected together. The externally threaded post 19 serves as an air inlet, introducing gas into the cavity of the second housing 13. The needle tip 18 of the discharge needle 17 is one pole of the high-voltage end, and the water inlet direct-connection interface 14 serves as the other pole of the high-voltage end. The externally threaded post 19 of the discharge needle 17 serves both as an air inlet channel connecting the cavity of the needle tip 18 and as a fixing structure for the high-voltage electrode, simplifying the independent installation requirements of the gas path and the circuit and reducing the risk of leakage. Gas flows directly from the internal cavity of the discharge needle 17 to the inlet of the insulating tube 20, where the water pressure and gas pressure balance to form a stable bubble group at the tube inlet, ensuring that the discharge area is concentrated at the gas-liquid interface.

[0055] In this embodiment, the discharge needle 17 is fixed by potting glue and needle tube support 16. The potting glue seals the gap between the discharge needle 17 and the needle tube support 16, which has the functions of waterproofing, insulation and vibration resistance, and prevents surface creep or electrode displacement during high voltage discharge.

[0056] In this embodiment, the needle 18 is made of a corrosion-resistant conductive metal material, such as stainless steel. The outer diameter of the needle 18 is equal to the inner diameter of the glass tube 5, and the length of the needle 18 is shorter than that of the insulating tube 202~5mm.

[0057] In this embodiment, the second housing 13 is made of insulating material, such as acrylic; the inlet straight-through interface 14 and the outlet straight-through interface 15 are made of corrosion-resistant conductive metal material, such as stainless steel.

[0058] When the gas-liquid discharge device 12 is working, water is injected through the water inlet port 14, and the water gradually fills the hollow part of the shell and submerges the discharge needle 17. Gas is introduced through the cavity of the external threaded column 19, and the cavity of the external threaded column 19 and the cavity of the needle 18 are connected. Under the action of air pressure, the water in the needle 18 and the insulating tube 20 is squeezed out and forms bubbles at the opening of the insulating tube 20.

[0059] The gas-liquid discharge power supply 25 provides a high-voltage electric field to the two poles of the high-voltage end, namely the needle tip 18 of the discharge needle 17 and the water inlet straight-through interface 14. Water, as a conductor, introduces the voltage of the water inlet straight-through interface 14 to the area around the bubble at the opening of the insulating tube 20. Under the action of the high-voltage electric field, the discharge needle 17 discharges to the water through the bubble. The gas inside the bubble is ionized to form plasma, thus completing the gas-liquid discharge and generating plasma-activated water.

[0060] Plasma-activated water enters the reaction vessel 27, where it reacts with toxic substances in the water to complete water disinfection and is then discharged.

[0061] Example 3

[0062] Referring to 6-7, a plasma water disinfection device includes a housing, which is divided into four upper and lower regions and separated by a first partition, a second partition, and a third partition. A water pump 21 and an ejector 22 are installed on the bottom plate of the housing. A gas-liquid discharge device 12 is installed on the first partition, and two air pumps 23 are installed on both sides of the gas-liquid discharge device 12. A gas phase discharge device 1 is installed on the second partition. A gas phase discharge power supply 24, a gas-liquid discharge power supply 25, and a main control board 26 are installed on the third partition. A reaction vessel 27 is vertically installed on the lower part of the side plate of the housing.

[0063] The air inlet of the air pump 23 is connected to the air inlet of the housing through a pipeline. The air outlet of the air pump 23 is connected to one end of the air passage tee. The other two ends of the air passage tee are respectively connected to the first throttle valve and the second throttle valve. The other end of the first throttle valve is connected to the air inlet of the gas phase discharge device 1, and the other end of the second throttle valve is connected to the air inlet of the gas-liquid discharge device 12. The air outlet of the gas phase discharge device 1 is connected to the air inlet of the ejector 22.

[0064] The inlet of the water pump 21 is connected to the inlet of the housing via a pipeline. The outlet of the water pump 21 is connected to the inlet of the jet injector 22. The outlet of the jet injector 22 is connected to the inlet of the gas-liquid discharge device 12. The outlet of the gas-liquid discharge device 12 is connected to the inlet of the reaction vessel 27. The outlet of the reaction vessel 27 is connected to the outlet of the housing.

[0065] The power supply ports of the gas phase discharge power supply 24 and the liquid phase discharge power supply are both connected to the main control board 26. The high voltage output terminal of the gas phase discharge power supply 24 is connected to the outer electrode and inner electrode 6 of the first housing 4 of the gas phase discharge device 1. The high voltage output terminal of the gas-liquid discharge power supply 25 is connected to the two poles of the gas-liquid discharge device 12, namely the needle tip 18 of the discharge needle 17 and the water inlet.

[0066] In this embodiment, a cooling fan 28 is provided on the upper side plate of the outer casing.

[0067] The working method of the plasma water disinfection device includes the following steps:

[0068] S1. When the device is working, the water pump 21 transports external water to the ejector 22 through the pipeline, and the air pump 23 introduces external gas. Part of the gas enters the external threaded column 19 of the gas-liquid discharge device 12, and part of the gas enters the air inlet of the gas phase discharge device 1.

[0069] S2. After the gas enters the gas phase discharge device 1, the gas phase discharge power supply 24 applies a high voltage electric field between the first housing 4 and the inner electrode 6, so that the gas between the glass tube 5 and the inner electrode 6 is ionized to generate active gas, which is discharged through the gas outlet. The active gas enters the gas inlet of the jet injector 22 and mixes with water, and enters the gas-liquid discharge device 12 through the pipeline and the water inlet direct interface 14.

[0070] S3. As water from the gas-liquid discharge device 12 gradually fills the hollow part of the second housing 13 and submerges the discharge needle 17, gas entering from the cavity of the external thread column 19 enters the cavity of the needle 18. Under the action of air pressure, the water in the needle 18 and the insulating tube 20 is squeezed out and bubbles are formed at the opening of the insulating tube 20.

[0071] The gas-liquid discharge power supply 25 provides a high-voltage electric field to the needle tip 18 of the discharge needle 17 and the water inlet straight-through interface 14 respectively. Water, as a conductor, introduces the voltage of the water inlet straight-through interface 14 to the area around the bubble at the opening of the insulating tube 20. Under the action of the high-voltage electric field, the discharge needle 17 discharges to the water through the bubble. The gas inside the bubble is ionized to form plasma, thus completing the gas-liquid discharge and generating plasma-activated water.

[0072] S4. The plasma-activated water from the gas-liquid discharge device 12 enters the reaction container 27 through the outlet port 15. In the reaction container 27, it reacts with the toxic substances in the water to complete the water disinfection and discharge.

Claims

1. A gas discharge device, characterized by: The device includes a first end (2) and a second end (3). A first housing (4) is fixed between the first end (2) and the second end (3) as an external electrode. The interior of the first housing (4) is a hollow cavity. A glass tube (5) is placed inside the hollow cavity. The glass tube (5) is bonded to the inner wall of the first housing (4) by thermally conductive silicone. The outer diameter of the glass tube (5) is equal to the inner diameter of the first housing (4). An internal electrode (6) is placed inside the glass tube (5). An air inlet is provided on the first end (2), and an air outlet is provided on the second end (3). The outer diameter of the internal electrode (6) is 1-2 mm smaller than the inner diameter of the glass tube (5). The length of the glass tube (5) is 5-10 mm shorter than the length of the internal electrode (6). The length of the internal electrode (6) is 5-15 mm longer than the length of the first housing (4).

2. The gas discharge device of claim 1, wherein: The first end (2) and the second end (3) extend inward to form a protrusion, and the protrusion and the inner wall of the first end (2) or the second end (3) form a limiting groove (7), and the two ends of the inner electrode (6) are engaged in the limiting groove (7).

3. The gas discharge device of claim 1, wherein: The first end (2) and the second end (3) are made of insulating material, and the inner electrode (6) is made of corrosion-resistant conductive metal material; the first shell (4) is made of conductive metal material.

4. The gas discharge device of claim 1, wherein: The second end (3) is provided with a slot (8), and an anti-detachment screw (9) is installed in the slot (8) to press against the glass tube (5).

5. The gas discharge device of claim 1, wherein: The outer side of the first housing (4) is provided with a stepped groove (10). Inside the stepped groove (10), an observation hole is provided on the side of the first housing (4). A diffuser plate (11) is installed on the stepped groove (10). The diffuser plate (11) is made of semi-transparent plastic material.

6. A plasma water disinfecting device, characterized by: Includes a water pump (21), an ejector (22), a gas-liquid discharge device (12), a gas pump (23), a gas phase discharge device (1) according to any one of claims 1-5, a gas phase discharge power supply (24), a gas-liquid discharge power supply (25), a main control board (26), and a reaction vessel (27). The air inlet of the air pump (23) is connected to the air inlet on the outer shell of the device through a pipeline. The air outlet of the air pump (23) is connected to one end of the air passage tee. The other two ends of the air passage tee are respectively connected to the first throttle valve and the second throttle valve. The other end of the first throttle valve is connected to the air inlet of the gas phase discharge device (1). The other end of the second throttle valve is connected to the air inlet of the gas-liquid discharge device (12). The air outlet of the gas phase discharge device (1) is connected to the air inlet of the jet injector (22). The inlet of the water pump (21) is connected to the inlet of the housing through a pipeline. The outlet of the water pump (21) is connected to the inlet of the jet injector (22). The outlet of the jet injector (22) is connected to the inlet of the gas-liquid discharge device (12). The outlet of the gas-liquid discharge device (12) is connected to the inlet of the reaction vessel (27). The outlet of the reaction vessel (27) is connected to the drain outlet on the outer shell of the device. The power supply ports of the gas phase discharge power supply (24) and the liquid phase discharge power supply are both connected to the main control board (26). The high voltage output terminal of the gas phase discharge power supply (24) is connected to the outer electrode and inner electrode (6) of the first housing (4) of the gas phase discharge device (1). The high voltage output terminal of the gas-liquid discharge power supply (25) is connected to the two poles of the high voltage terminal of the gas-liquid discharge device (12).

7. The plasma water disinfection device according to claim 6, characterized in that: The gas-liquid discharge device (12) includes a second housing (13), which is rectangular in shape, hollow inside, and open at both ends. One end of the second housing (13) is equipped with a water inlet direct-connection interface (14), and the other end is equipped with a water outlet direct-connection interface (15). A needle tube support (16) is installed on the top of the second housing (13), and a discharge needle (17) is fixed on the needle tube support (16). The discharge needle (17) includes a needle tip (18), an external threaded post (19), and a discharge needle (17). An insulating tube (20) is used, one end of the needle (18) is inserted into the insulating tube (20), and the other end of the needle (18) is threaded to the external threaded post (19). The external threaded post (19) and the needle (18) are respectively provided with cavities and are connected together. The external threaded post (19) serves as an air inlet to introduce gas into the cavity of the second housing (13). The needle (18) of the discharge needle (17) is one pole of the high voltage end, and the water inlet straight-through interface (14) serves as the other pole of the high voltage end.

8. The plasma water disinfection device according to claim 7, characterized in that: The needle holder (16) is mounted on the second housing (13) by bolt assembly. The needle holder (16) has a through groove running from top to bottom. The diameter of the through groove is shorter at the top and longer at the bottom. A discharge needle (17) is placed in the through groove. The discharge needle (17) is fixed to the needle holder (16) by potting glue.

9. The plasma water disinfection device according to claim 7, characterized in that: The needle (18) is made of corrosion-resistant conductive metal. The outer diameter of the needle (18) is equal to the inner diameter of the insulating tube (20). The length of the needle (18) is 2-5 mm shorter than that of the insulating tube (20). The second housing (13) is made of insulating material. The inlet straight-through interface (14) and the outlet straight-through interface (15) are made of corrosion-resistant conductive metal.

10. The plasma water disinfection device according to claim 6, characterized in that: The plasma water disinfection device includes a shell, which is divided into four areas, upper and lower, and separated by a first partition, a second partition and a third partition. A water pump (21) and an ejector (22) are installed on the bottom plate of the shell. A gas-liquid discharge device (12) is installed on the first partition. Two air pumps (23) are installed on both sides of the gas-liquid discharge device (12). A gas phase discharge device (1) is installed on the second partition. A gas phase discharge power supply (24), a gas-liquid discharge power supply (25) and a main control board (26) are installed on the third partition. A reaction container (27) is vertically installed on the lower outside of the side plate of the shell.

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