Modularized tubular low-temperature plasma generator

Abstract

The utility model provides a modular tubular low-temperature plasma generator, which is characterized in that a cylindrical pin is arranged at the top end of a high-voltage positive electrode of a microneedle group, one end of a high-voltage positive wire is connected with a positive high-voltage output port of a hundred nanosecond direct-current high-frequency high-voltage power supply host, and a nut column is arranged at the other end of the high-voltage positive wire; the two ends of the isolation sleeve are fixedly connected with the cylindrical pin and the nut column respectively, the top end of the nut column is fixedly connected with the bottom end of the concentric circle connecting support, and the negative electrode of the metal dielectric sleeve is arranged outside the high-voltage positive electrode of the microneedle set in a sleeving mode and connected with a high-voltage negative wire. The outer edge of the bottom end of the concentric circle connecting support and the top end of the insulating tube are bonded and fixed to form a low-temperature plasma generator, the low-temperature plasma generator is sleeved with the tubular fin radiator, and the top end and the bottom end of the tubular fin radiator are fixedly sealed with the compressed air inlet end cover assembly and the low-temperature plasma outlet end cover assembly respectively. The device has the beneficial effects that the energy consumption can be reduced, the requirements of corollary equipment and facilities are reduced, and the plasma yield is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of plasma generators, and more specifically, to a modular tubular low-temperature plasma generator. Background Technology

[0002] In recent years, cryogenic plasma technology has become an emerging research hotspot. A cryogenic plasma generator typically refers to a device component used to generate cryogenic plasma, which is a partially ionized gas with low electron and ion concentrations, yet still exhibits significant electromagnetic and chemical reaction characteristics. This type of plasma plays an important role in various applications, such as surface treatment, waste gas treatment, and biomedicine.

[0003] Low-temperature plasma generators typically use electric fields, microwaves, or radio frequencies to excite gas molecules, causing them to partially ionize and form plasma. The specific working principle may vary depending on the equipment and application scenario, and factors such as gas selection, electrode structure, and electric field distribution need to be considered to optimize plasma generation and performance.

[0004] Ozone generators are a type of plasma generator, and their structures are mainly divided into two categories: tubular and plate-type. These devices generally face problems such as high energy consumption, complex supporting equipment and facilities requirements, insufficient production supply, cumbersome maintenance work, and expensive operating costs. These challenges restrict the further development of low-temperature plasma technology. Utility Model Content

[0005] The technical problem to be solved by this utility model is how to reduce energy consumption, reduce the demand for supporting equipment and facilities, and increase plasma output. In order to overcome the defects of the above-mentioned existing technology (or related technology), this utility model provides a modular tubular low-temperature plasma generator.

[0006] This utility model provides a modular tubular low-temperature plasma generator, including a 100-nanosecond-level DC high-frequency high-voltage power supply main unit, a microneedle group high-voltage positive electrode, a high-voltage positive wire, a metal dielectric sheath negative electrode, a high-voltage negative wire, an isolation sleeve, a concentric circular connecting bracket, an insulating tube, a tubular finned heat sink, a compressed air inlet end cap assembly, and a low-temperature plasma outlet end cap assembly. The top of the microneedle group high-voltage positive electrode is provided with a cylindrical pin. One end of the high-voltage positive wire is connected to the positive high-voltage output port of the 100-nanosecond-level DC high-frequency high-voltage power supply main unit, and the other end of the high-voltage positive wire is provided with a nut post. Both ends of the isolation sleeve are fixedly connected to the bottom ends of the cylindrical pin and the nut post, respectively. The top of the nut post... The end is fixedly connected to the center area of ​​the bottom of the concentric circle connecting bracket. The negative electrode of the metal dielectric sleeve is connected to the high voltage negative electrode wire for connecting to the negative high voltage output port of the 100 nanosecond DC high frequency high voltage power supply host. The negative electrode of the metal dielectric sleeve is sleeved on the outside of the high voltage positive electrode of the microneedle group and is bonded and fixed to the inner wall of the insulating tube. The outer edge of the bottom of the concentric circle connecting bracket is bonded and fixed to the top of the insulating tube to form a low temperature plasma generator. The tubular finned heat sink is sleeved on the outside of the low temperature plasma generator, and the top and bottom of the tubular finned heat sink are fixedly sealed to the compressed air inlet end cap assembly and the low temperature plasma outlet end cap assembly, respectively.

[0007] Compared with the prior art, the modular tubular cryogenic plasma generator proposed in this application has the following advantages:

[0008] This application integrates a microneedle high-voltage positive electrode, a metal dielectric sleeve negative electrode, an isolation sleeve, a concentric circle connecting bracket, an insulating tube, a tubular finned heat sink, a compressed air inlet end cap assembly, and a low-temperature plasma outlet end cap assembly to form a small-volume modular tubular low-temperature plasma generator. The microneedle high-voltage positive electrode uses a micron-level tip-coupled toroidal corona high-frequency high-voltage discharge method to generate low-temperature plasma, which significantly improves the electron volt energy density and plasma yield per unit volume. Furthermore, the modular design of the overall tubular structure reduces the generator volume, requiring only a 100-nanosecond-level DC high-frequency high-voltage power supply host as a supporting device. Other power supply and power consumption equipment are not required, which reduces the demand for supporting equipment and facilities while effectively reducing energy consumption.

[0009] In one possible implementation, the pulse width of the 100-nanosecond-level DC high-frequency high-voltage power supply host is 100~600ns, the input voltage is DC 24~30V, the output voltage is DC 18~100KV, and the frequency is 15~50KHz.

[0010] In one possible implementation, the system further includes power connection wires and a switching power supply. The power connection wires include a DC power positive connection wire, a DC power negative connection wire, an AC neutral connection wire, and an AC live connection wire. The positive DC input terminal of the nanosecond-level DC high-frequency high-voltage power supply is electrically connected to the positive DC output terminal of the switching power supply via the DC power positive connection wire. The negative DC input terminal of the nanosecond-level DC high-frequency high-voltage power supply is electrically connected to the negative DC output terminal of the switching power supply via the DC power negative connection wire. The neutral wire of the AC input terminal of the switching power supply is electrically connected to the neutral output terminal of the 220V AC power control switch via the AC neutral connection wire. The live wire of the AC input terminal of the switching power supply is electrically connected to the live output terminal of the 220V AC power control switch via the AC live connection wire.

[0011] Compared with existing technologies, the above technical solution can achieve physical isolation between strong and weak currents through a four-wire independent wiring scheme consisting of a DC power supply positive terminal connection wire, a DC power supply negative terminal connection wire, an AC mains neutral wire connection wire, and an AC mains live wire connection wire. Furthermore, the segmented management of the 220V mains control switch and the switching power supply reduces standby power consumption.

[0012] In one possible implementation, the high-voltage positive electrode of the microneedle assembly includes multiple microneedles, multiple metal spacer sleeves, a Torx screw, and an anti-loosening nut. Each of the microneedles is stacked along the axial direction of the spacer sleeve, and a metal spacer sleeve is provided between each pair of adjacent microneedles. The Torx screw passes through each of the microneedles and each of the metal spacer sleeves in sequence, engages with the anti-loosening nut, and is fixedly connected with the cylindrical pin.

[0013] Compared with existing technologies, the above technical solution can utilize the axial pre-tightening structure of the Torx screw rod in conjunction with the equidistant distribution of the metal spacer sleeve to form a three-dimensional discharge array of microneedles, thereby improving the low-temperature plasma yield and ensuring long-term discharge stability.

[0014] In one possible implementation, each of the microneedles is a hollowed-out microneedle or a solid microneedle.

[0015] In one possible implementation, the concentric circular connecting bracket includes an outer adhesive fixing ring, a concentric central ring, and multiple connecting brackets. The diameter of the concentric central ring is smaller than the diameter of the outer adhesive fixing ring. One end of each connecting bracket is connected to the inner peripheral wall of the outer adhesive fixing ring, and the other end of each connecting bracket is connected to the outer peripheral wall of the concentric central ring.

[0016] Compared with existing technologies, the above technical solution can achieve a stable connection between the externally bonded and fixed ring and the concentric central ring by connecting the bracket, thus ensuring stability.

[0017] In one possible implementation, a circular groove is formed on the outer peripheral wall of the outer adhesive fixing ring, and a wiring hole is formed between the circular groove and the inner wall of the insulating tube for the high-voltage negative electrode wire to pass through.

[0018] Compared with existing technologies, the above-mentioned technical solution can form a wiring hole through a circular groove and the inner wall of the insulating tube, providing a separate space to accommodate the high-voltage negative line, effectively improving space utilization.

[0019] In one possible implementation, one end of the high-voltage negative electrode line is provided with an Ϙ-shaped metal ring, and an Ϙ-shaped groove is provided on the outer wall of the metal dielectric sleeve negative electrode for embedding the Ϙ-shaped metal ring.

[0020] Compared with existing technologies, the above technical solution can ensure the secure engagement of the Ϙ-type metal ring by utilizing the dovetail locking structure of the Ϙ-type slot.

[0021] In one possible implementation, the inner wall of the negative electrode of the metal dielectric sleeve is provided with a dielectric coating.

[0022] In one possible implementation, a cooling fan is also included, which is mounted below the cryogenic plasma outlet end cap assembly and is fixedly connected to the cryogenic plasma outlet end cap assembly via an extended through-thread nut. Attached Figure Description

[0023] Figure 1 This is a perspective view of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the Gram head of this utility model;

[0026] Figure 4 This is a structural schematic diagram of the compressed air inlet end cap assembly and pipeline interface of this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the tubular finned radiator of this utility model;

[0028] Figure 6 This is a schematic diagram of the concentric circle connecting bracket of this utility model;

[0029] Figure 7 This is a schematic diagram of the high-voltage positive electrode wire of this utility model;

[0030] Figure 8 This is a schematic diagram of the high-voltage negative electrode wire of this utility model;

[0031] Figure 9 This is a schematic diagram of the structure of the insulating tube of this utility model;

[0032] Figure 10 This is a schematic diagram of the structure of the negative electrode of the metal dielectric sleeve of this utility model;

[0033] Figure 11 This is a schematic diagram of the structure of the microneedle sheet of this utility model;

[0034] Figure 12 This is a schematic diagram of the structure of the metal spacer sleeve of this utility model;

[0035] Figure 13 This is a schematic diagram of the cylindrical pin of this utility model;

[0036] Figure 14 This is a schematic diagram of the structure of the isolation sleeve of this utility model;

[0037] Figure 15 This is a structural schematic diagram of the low-temperature plasma outlet end cap assembly and pipeline interface of this utility model.

[0038] Figure 16 This is a top view of the internal structure of the tubular low-temperature plasma generator of this utility model;

[0039] Figure 17 This is a perspective view of the structure of the high-voltage positive electrode of the microneedle assembly of this utility model;

[0040] Figure 18 This is a perspective view of the structure of the microneedle assembly high voltage positive electrode and concentric circle connecting bracket assembly of this utility model.

[0041] Figure 19 This is a schematic diagram of the structure of the high-voltage negative electrode of this utility model;

[0042] Figure 20 This is a perspective view of the structure of the low-temperature plasma generator of this utility model;

[0043] Figure 21 This is a perspective view of the structure of the tubular low-temperature plasma generator of this utility model;

[0044] Explanation of reference numerals in the attached diagram: 1. Switching power supply; 2. Power connection wire; 3. Power supply unit; 4. High-voltage negative power line sealing and locking flange; 5. High-voltage positive power line sealing and locking flange; 6. Compressed air inlet connection pipe; 7. Compressed air inlet end cap assembly; 8. Fixing screw; 9. Tubular finned heat sink; 10. Insulating tube; 11. Nut post; 12. Concentric circle connecting bracket; 13. Isolation sleeve; 14. Cylindrical pin; 15. Metal spacer sleeve; 16. Microneedle plate; 17. Torx screw rod; 18. Low-temperature plasma outlet end cap assembly; 19. Low-temperature plasma outlet pipe; 20. Compressed air; 21. Low-temperature plasma; 22. Metal dielectric sheath negative electrode; 23. High-voltage negative electrode wire; 24. High-voltage positive electrode wire; 25. Ϙ-type metal ring; 26. High-voltage negative electrode wire guide groove; 27. Ϙ-type slot; 28. External adhesive fixing ring; 29. ​​Concentric central ring; 30. Connecting bracket; 31. Wiring hole; 32. Tubular low-temperature plasma generator; 33. Mounting hole; 34. Anti-loosening nut; 35. Cooling fan; 36. Extended through-thread screw nut; 37. Microneedle group high-voltage positive electrode; 38. Microneedle group high-voltage positive electrode and concentric circle connecting bracket assembly; 39. High-voltage negative electrode; 40. Low-temperature plasma generator. Detailed Implementation

[0045] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0046] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0047] Example 1

[0048] See Figure 1 , Figures 2-16 as well as Figure 17This application discloses a modular tubular cryogenic plasma generator, mainly including a tubular cryogenic plasma generator 32, a 100-nanosecond-level DC high-frequency high-voltage power supply host 3, a power connection wire 2, a cooling fan 35, etc. The tubular cryogenic plasma generator 32 specifically includes a microneedle high-voltage positive electrode 37, a metal dielectric sleeve negative electrode 22, an isolation sleeve 13, a concentric circle connecting bracket 12, an insulating tube 10, a tubular finned heat sink 9, a compressed air inlet end cap assembly 7, a cryogenic plasma outlet end cap assembly 18, a high-voltage negative electrode wire 23, and a high-voltage positive electrode wire 24. The microneedle high-voltage positive electrode 37, the isolation sleeve 13, and the concentric circle connecting bracket 12 are assembled together to form a microneedle high-voltage positive electrode and concentric circle connecting bracket assembly 38. The high-voltage negative electrode wire 23, with an Ϙ-shaped metal ring 25 welded to one end, and the metal dielectric sleeve negative electrode 22 are assembled together to form a high-voltage positive electrode assembly 38. The high-voltage negative electrode 39 and the outer wall of the metal dielectric sleeve negative electrode 22 are coated with adhesive and bonded to the inner wall of the insulating tube 10. The metal dielectric sleeve negative electrode 22 is fitted outside the high-voltage positive electrode 37 of the microneedle group. After the concentricity of the high-voltage positive electrode of the microneedle group, the concentric circle connecting bracket assembly 38, and the metal dielectric sleeve negative electrode 22 in the high-voltage negative electrode 39 is adjusted, the outer adhesive fixing ring 28 of the concentric circle connecting bracket 12 is firmly bonded to the insulating tube 10 and assembled into a low-temperature plasma generator 40. The low-temperature plasma generator 40 is installed in the tubular finned heat sink 9. The tubular low-temperature plasma generator 32 is assembled together using the compressed air inlet end cap assembly 7, the low-temperature plasma outlet end cap assembly 18, and the fixing screws 8. The power connection wire 2 mainly includes a power connection wire 2 with an aviation plug, a high-voltage negative wire 23, and a high-voltage positive wire 24.

[0049] like Figure 1 As shown, the high-voltage positive line 24 of the tubular low-temperature plasma generator 32 passes through the high-voltage positive power line sealing and locking connector 5 and is connected to the DC+ output terminal of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3. The high-voltage negative line 23 of the tubular low-temperature plasma generator 32 passes through the high-voltage negative power line sealing and locking connector 4 and is connected to the DC- output terminal of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3. The input terminal of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3 is electrically connected to the DC+ and DC- output terminals of the 220V to 24V switching power supply 1 through the power connection wire 2 with aviation plug. The input terminal of the 220V to 24V switching power supply 1 is electrically connected to the mains live wire and neutral wire.

[0050] In this embodiment, the pulse width of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3 is 100-600ns, the input voltage is DC24-30V, the output voltage is DC18-100KV, and the frequency is 15-50KHz. The preferred pulse width is 100-400ns, the preferred output voltage is 20-30KV, and the preferred frequency is 15-20KHz. As a further preferred embodiment, the operating pulse width of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3 in this embodiment is 200-400ns, the frequency is 15-18KHz, and the output voltage is 20-25KV.

[0051] In this embodiment, both the high-voltage negative line 23 and the high-voltage positive line 24 are connected to quick-connect plugs, which are conventional commercially available DC silicone wires and high-voltage plugs. Specifically, they can be double-insulated silicone wires and high-voltage plugs with tinned copper wire cores that can withstand DC high voltage of 30-250KV. More preferably, double-insulated silicone wires and high-voltage plugs with tinned copper wire cores that can withstand DC high voltage of 30-50KV can be used.

[0052] In this embodiment, the microneedle assembly of the high-voltage positive electrode 37 includes multiple microneedle pieces 16. Adjacent microneedle pieces 16 are separated by metal spacer sleeves 15, preferably made of stainless steel. All microneedle pieces 16 and metal spacer sleeves 15 are coaxially fitted together and sequentially connected by Torx screws 17, then secured with anti-loosening nuts 34, and finally connected to cylindrical pins 14. Figure 1 , Figure 2 and Figure 17 As shown; the microneedle assembly high-voltage positive electrode 37, the isolation sleeve 13, and the concentric circle connecting bracket 12 are assembled together to form the microneedle assembly high-voltage positive electrode and concentric circle connecting bracket assembly 38, as shown. Figure 18 As shown.

[0053] In this embodiment, the microneedle group typically comprises 3-12 microneedle sheets 16, with a spacing of 8 mm or 10 mm between adjacent microneedle sheets 16. The spacing between adjacent microneedle sheets 16 is generally achieved through a metal spacer sleeve 15; that is, the axial length of the metal spacer sleeve 15 is the spacing between adjacent microneedle sheets 16. Depending on the discharge power and the concentration of the generated low-temperature plasma, 3, 6, 9, or 12 microneedle sheets 16 can be preferably used to form the microneedle group. Different numbers of microneedle sheets 16 are used in the microneedle group. The spacing between the microneedles 16 is also adjusted accordingly. For example, when the microneedle group has 3 or 6 microneedles 16, the spacing between adjacent microneedles 16 is 8mm (that is, the axial length of the metal spacer sleeve 15 tightly attached between adjacent microneedles 16 is 8mm). When the microneedle group has 9 or 12 microneedles 16, the spacing between adjacent microneedles 16 is 10mm (that is, the axial length of the metal spacer sleeve 15 tightly attached between adjacent microneedles 16 is 10mm).

[0054] In this embodiment, the microneedle sheet 16 is preferably a solid microneedle sheet. In the same microneedle group, all microneedle sheets 16 generally have the same structure and dimensions. As a preferred embodiment, the outer periphery of the microneedle sheet 16 is needle-shaped, with an outer contour diameter (i.e., the diameter of the ring where the needle tip is located) of 30-63 mm, a thickness of 0.2-0.5 mm, a needle length of 2.0-4.0 mm, 80-100 needles, a needle diameter of 50-150 micrometers, a distance between adjacent needle tips of 1.04-2.19 mm, and a central shaft hole diameter of 2.85-3.85 mm. As a further preferred embodiment, the outer contour diameter of the microneedle sheet 16 is 36.5 mm, the thickness is 0.4 mm, the needle length is 3.0 mm, the number of needles is 90, the needle diameter is 100 micrometers, the distance between adjacent needle tips is 1.27 mm, and the central shaft hole diameter is 2.85 mm. Figure 2 and Figure 11 The diagram shown is a schematic of the structure of a microneedle assembly with six microneedle pads 16.

[0055] In this embodiment, the microneedle sheet 16 is made of 304 stainless steel, 316 stainless steel, titanium alloy, pure titanium, titanium material plated with platinum, titanium material plated with platinum and iridium, titanium material plated with ruthenium and iridium, etc., wherein titanium alloy and titanium material plated with platinum and titanium material plated with platinum and iridium are preferred.

[0056] In this embodiment, the concentric circular connecting bracket 12 specifically includes an outer adhesive fixing ring 28, a concentric central ring 29, a connecting bracket 30, and a wiring hole 31. The concentric central ring 29 is located inside the outer adhesive fixing ring 28 and is arranged concentrically with it. The connecting bracket 30 is located in the annular space formed by the outer ring of the concentric central ring 29 and the inner ring of the outer adhesive fixing ring 28. The three connecting brackets 30 are located in the same plane, and their tail ends converge and connect to the concentric central ring 29. The head ends of the three connecting brackets 30 are spread out and set at a 120° angle to each other. The head ends of the three connecting brackets 30 are all connected to the outer adhesive fixing ring 28. During assembly, the concentric circular connecting bracket 12 is concentrically fitted onto the outer adhesive fixing ring 28 through its concentric central ring 29. Figure 7 The nut post 11, which is injection molded and wrapped at one end of the medium- and high-voltage positive electrode power supply connecting wire, is assembled together with the microneedle group high-voltage positive electrode 37 to form the microneedle group high-voltage positive electrode and concentric circle connecting bracket assembly 38.

[0057] In this embodiment, it is preferred that the outer contour diameter of the concentric circle connecting bracket 12 is greater than the outer contour diameter of the microneedle sheet 16. Specifically, it is preferred that the outer contour diameter of the concentric circle connecting bracket 12 is 1.75-2.87 times the outer contour diameter of the microneedle sheet 16, and more preferably that the outer contour diameter of the concentric circle connecting bracket 12 is 2.36 times the outer contour diameter of the microneedle sheet 16.

[0058] In this embodiment, the material of the concentric circle connecting bracket 12 is preferably carbon fiber, carbon nanofiber, epoxy resin glass fiber, silicon carbon resin fiber, polytetrafluoroethylene, etc., and more preferably the concentric circle connecting bracket 12 is made of epoxy resin glass fiber board.

[0059] In this embodiment, the metal dielectric sleeve negative electrode 22 is specifically fitted onto the outside of the microneedle assembly. The outer wall of the metal dielectric sleeve negative electrode 22 is provided with an Ϙ-shaped groove 27 for positioning the Ϙ-shaped metal ring 25 and a high-voltage negative electrode wire groove 26 for carrying the high-voltage negative electrode wire 23. The Ϙ-shaped metal ring 25, welded to one end of the high-voltage negative electrode wire 23, is fitted onto the Ϙ-shaped groove 27 on the outer wall of the metal dielectric sleeve negative electrode 22 and welded firmly, thus assembling the assembly. Figure 19 The high-voltage negative electrode 39; specifically, in this embodiment, the axial length of the metal dielectric sleeve negative electrode 22 is preferably 75mm, the inner diameter of the tube is 73.5mm, the wall thickness of the tube is 3mm, and the outer diameter of the tube is 79.5mm. The dimensions of the Ϙ-shaped groove 27 are preferably cylindrical with a diameter of 3mm and a height of 1.5mm, a diameter of 9mm, a groove width of 3mm, and a groove depth of 1.5mm. The tail length of the Ϙ-shaped groove 27 is the length from the outer wall edge of the metal dielectric sleeve negative electrode 22 to the groove, and its length is 10mm.

[0060] In this embodiment, the metal dielectric sleeve negative electrode 22 can be processed into short tubes of different diameters and / or different lengths according to actual needs, and can be matched and adjusted according to the voltage strength of DC positive high voltage and DC negative high voltage inside the tube.

[0061] In this embodiment, the metal dielectric sleeve negative electrode 22 can be based on stainless steel, zinc alloy, aluminum alloy, or magnesium-aluminum alloy tubing, preferably aluminum alloy or magnesium-aluminum alloy tubing. The inner wall of the metal dielectric sleeve negative electrode 22 is further treated with an insulating dielectric coating made of insulating materials such as epoxy resin, polytetrafluoroethylene, or silicone rubber. The insulating dielectric coating material is preferably nano-polytetrafluoroethylene. The thickness of the insulating dielectric coating is 0.2-4.0 mm. In this embodiment, the thickness of the insulating dielectric coating is preferably 0.5 mm.

[0062] In this embodiment, the outer diameter of the microneedle 16 is preferably proportional to the inner diameter of the metal dielectric sleeve negative electrode 22; the distance between the tip of the microneedle 16 and the inner wall of the metal dielectric sleeve negative electrode 22 has a linear relationship with the voltage strength in the electric field. For example, when the distance between the tip of the microneedle 16 and the inner wall of the metal dielectric sleeve negative electrode 22 is in the range of 20-100mm, the ratio of the change in voltage strength in the electric field to the change in distance is 1000V / 1mm; for example, with a 30KV working electric field voltage as the reference electric field voltage in the cavity of the metal dielectric sleeve negative electrode 22, the standard distance between the tip of the microneedle 16 and the inner wall of the metal dielectric sleeve negative electrode 22 is... The distance is 30mm; for every 1000V decrease in the working voltage, the distance between the tip of the microneedle 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve decreases by 1mm until the minimum distance is 20mm; conversely, for every 1000V increase in the working electric field voltage, the distance between the tip of the microneedle 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve increases by 1mm until the distance increases to 100mm; as a preferred embodiment, in specific operation, the working electric field voltage inside the negative electrode 22 of the metal dielectric sleeve is a DC high voltage of 22KV, and the distance between the tip of the microneedle 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve is preferably 22mm.

[0063] In this embodiment, the insulating tube 10 can be made of epoxy resin glass fiber tube or polytetrafluoroethylene tube, etc. Specifically, the insulating tube 10 is preferably made of polytetrafluoroethylene tube. The inner diameter of the insulating tube 10 is preferably 0.5 mm larger than the outer diameter of the metal dielectric sleeve negative electrode 22. The insulating tube 10 and the metal dielectric sleeve negative electrode 22 are coaxial, and the axial length of the insulating tube 10 is preferably 75 mm larger than the axial length of the metal dielectric sleeve negative electrode 22. The installation position of the metal dielectric sleeve negative electrode 22 is located in the lower middle part of the inner cavity of the insulating tube 10.

[0064] In this embodiment of the application, the axial length of the insulating tube 10 is preferably 150 mm, the inner diameter is 80 mm, the wall thickness is 3 mm, and the outer diameter is 86 mm.

[0065] In this embodiment, the insulating tube 10 and the concentric circular connecting bracket 12 are concentric and have the same diameter. The outer adhesive fixing ring 28 of the concentric circular connecting bracket 12 is also provided with a wiring hole 31. When the low-temperature plasma generator 40 is assembled, the inner wall of the insulating tube 10 is fitted onto the outer adhesive fixing ring 28. At this time, a wiring hole 31 is formed between the wiring hole 31 on the outer adhesive fixing ring 28 of the concentric circular connecting bracket 12 and the inner wall of the insulating tube 10, allowing the high-voltage negative electrode line 23 to pass through. The wiring hole 31 on the outer adhesive fixing ring 28 is preferably a semi-circular groove, and its semi-circular diameter is preferably 0.5 mm larger than the outer diameter of the high-voltage negative electrode line 23. After assembly, the gap between the wiring hole 31 and the high-voltage negative electrode line 23 is sealed with glue.

[0066] In this embodiment, the inner cavity of the tubular finned radiator 9 is fitted onto the outer wall of the low-temperature plasma generator 40. The inner cavity diameter of the tubular finned radiator 9 is 0.5 mm larger than the outer diameter of the low-temperature plasma generator 40. The tubular finned radiator 9 is preferably made of aluminum alloy. Specifically, as a preferred embodiment, the cross-section of the tubular finned radiator 9 is a sunflower radiator with eight M6 internal thread mounting holes 33. The thread depth of the eight M6 internal thread mounting holes 33 is 25 mm. The axial length of the tubular finned radiator 9 is 200 mm, the inner cavity diameter is 86.5 mm, the wall thickness is 4.5 mm, the fin height is 15 mm, the fin thickness is 2 mm, and the outer diameter of the tubular finned radiator 9 is 125.5 mm.

[0067] In this embodiment, the compressed air inlet end cap assembly 7 is preferably made of polytetrafluoroethylene (PTFE) sheet with a total thickness of 20mm and an outer diameter of 125.5mm. The end cap has eight mounting holes for lifting lugs, aligned with the cross-section of the tubular finned radiator 9, which has eight M6 internal thread mounting holes 33. The through-hole size is 8mm. A G1 / 2 threaded air inlet hole with a thread depth of 20mm is located at the center of the front of the end cap. A 1mm recessed O-ring groove with a diameter of 24mm is concentrically located within the G1 / 2 threaded air inlet hole at the center of the front of the end cap. The G1 / 2 threaded air inlet hole at the center of the front of the end cap is used to install the compressed air inlet pipe 6. An M20 threaded through hole with a thread depth of 20mm is located on each side of the G1 / 2 threaded air inlet hole at the center of the front of the end cap. The three holes are centered on the same center line, with a center distance of 28mm between adjacent holes. Two M20 threaded through holes on the front of the end cap are concentrically fitted with an O-ring groove with a 1mm depth and a diameter of 24mm. The two M20 threaded through holes on the front of the end cap are used to install M20 type grappling heads made of 304 stainless steel. One 304 stainless steel M20 type grappling head is used for the high-voltage positive line 24 through the hole, and is locked to prevent air leakage. The other 304 stainless steel M20 type grappling head is used for the high-voltage negative line 23 through the hole, and is locked to prevent air leakage. The back of the end cap is machined into a protruding circular sealing plug structure with an outer diameter of 86.5mm. The total thickness of the end cap is 20mm, the height of the circular sealing plug is 8mm, and the remaining portion is thinned to a thickness of 12mm.

[0068] In this embodiment, the low-temperature plasma outlet end cap assembly 18 is preferably made of polytetrafluoroethylene (PTFE) sheet with a total thickness of 20 mm and an outer diameter of 125.5 mm. The end cap is provided with eight lifting lug mounting holes, the holes of which are aligned with the cross-section of the tubular finned heat sink 9 with eight M6 internal thread mounting holes 33. The through-hole size is 8 mm. A G1 / 2 threaded vent hole with a thread depth of 20 mm is provided at the center of the front of the end cap. A recessed O-ring with a diameter of 24 mm and a depth of 1 mm is concentrically provided at the G1 / 2 threaded vent hole at the center of the front of the end cap. The G1 / 2 threaded vent hole at the center of the front of the end cap is used to install the low-temperature plasma outlet pipe 19. The back of the end cap is machined into a protruding circular sealing plug structure with an outer diameter of 86.5 mm. The total thickness of the end cap is 20 mm, the height of the circular sealing plug is 8 mm, and the remaining part is thinned to a thickness of 12 mm.

[0069] In this embodiment, the cooling fan 35 preferably uses DC24V power supply, with a maximum fan speed of 7500 rpm. The four mounting holes of the cooling fan 35 correspond to four of the mounting holes of the low-temperature plasma outlet end cover assembly 18, and are connected and fastened with an extended through thread nut 36.

[0070] In this embodiment, the assembly process and operating principle of the modular tubular cryogenic plasma generator are as follows:

[0071] (1) Use one end of the plum screw rod 17 to pass through the center of the first microneedle plate 16 and the first metal spacer sleeve 15 in sequence, then pass through the center of the second microneedle plate 16 and the second metal spacer sleeve 15, and so on, until the center of the sixth microneedle plate 16 is passed through. Then tighten it with the anti-loosening nut 34 to assemble six microneedle groups. Tightly connect the six microneedle groups to one end of the internal thread of the extended internal and external thread cylindrical pin of the high voltage positive electrode. Then put on the isolation sleeve 13. Then tighten it with the internal thread of the internal thread round nut column 11 that is injection molded and wrapped at one end of the high voltage positive electrode power supply connection wire embedded in the concentric central ring 29. Thus, the microneedle group high voltage positive electrode and concentric ring connection bracket assembly 38 is assembled.

[0072] (2) Weld a Ϙ-type metal ring 25 to one end of the high voltage negative electrode wire 23, and clamp it onto the Ϙ-type slot 27 on the outer wall of the metal dielectric sleeve negative electrode 22, and weld it firmly. The tail of the Ϙ-type metal ring welded to the high voltage negative electrode tin-copper wire of the high voltage negative electrode wire 23 is clamped in the high voltage negative electrode wire slot 26, and welded firmly in the same way. Thus, the high voltage negative electrode 39 is assembled.

[0073] (3) Apply adhesive to the outer wall of the metal dielectric sleeve negative electrode 22 in the high voltage negative electrode 39 and fix it to the lower part of the inner wall of the insulating tube 10. Specifically, the lower edge of the metal dielectric sleeve negative electrode 22 is aligned with the lower edge of the inner wall of the insulating tube 10 and recessed inward by 20mm. Pass the high voltage negative electrode wire 23 and quick plug in the high voltage negative electrode 39 through the wiring hole 31 in the micro needle group high voltage positive electrode and concentric circle connecting bracket assembly 38. After adjusting the concentricity of the micro needle group high voltage positive electrode and concentric circle connecting bracket assembly 38 and the metal dielectric sleeve negative electrode 22 in the high voltage negative electrode 39, use adhesive to firmly bond the outer adhesive fixing ring 28 of the concentric circle connecting bracket 12 to the insulating tube 10. Thus, the low temperature plasma generator 40 is assembled.

[0074] (4) Push the low-temperature plasma generator 40 into the tubular finned heat sink 9 from top to bottom. Adjust the distance between the lower edge of the low-temperature plasma generator 40 and the lower edge of the tubular finned heat sink 9 to 8 mm. Position the circular sealing plug protruding from the back of the compressed air inlet end cap assembly 7 downwards. Then, pass the high-voltage negative wire 23 and the high-voltage positive wire 24 through the two corresponding M20 threaded holes in the compressed air inlet end cap assembly 7. After adjusting and aligning the mounting holes, push the circular sealing plug protruding from the back of the compressed air inlet end cap assembly 7 into the inner cavity of the upper opening of the tubular finned heat sink 9. Use 8 fixing screws 8 to tighten and seal the compressed air inlet end cap assembly 7 and the tubular finned heat sink 9. The high-voltage negative wire 23 and the high-voltage positive wire 24 pass through the high-voltage negative power line sealing lock 4 and the high-voltage positive power line sealing lock 4, respectively. Seal the flange 5 tightly, then tighten the high-voltage negative power line sealing flange 4 and the high-voltage positive power line sealing flange 5 to the corresponding M20 threaded holes respectively, and lock the two flanges to seal and prevent air leakage. Install the compressed air inlet connecting pipe 6 into the G1 / 2 threaded air inlet hole in the center of the front of the compressed air inlet end cap assembly 7. Push the round sealing plug protruding from the back of the low-temperature plasma outlet end cap assembly 18 upward into the inner cavity of the lower opening of the tubular finned heat sink 9, adjust and align the mounting hole position, and use 4 fixing screws 8 to tighten and seal the low-temperature plasma outlet end cap assembly 18 and the tubular finned heat sink 9. Install the low-temperature plasma outlet pipe 19 into the G1 / 2 threaded air outlet hole in the center of the front of the low-temperature plasma outlet end cap assembly 18. The assembly of the tubular low-temperature plasma generator 32 is now complete.

[0075] (5) Use the extended through thread nut 36 to fasten the four mounting holes of the cooling fan 35 to the corresponding four mounting holes of the low temperature plasma outlet end cover assembly 18. The power cord of the cooling fan 35 is connected to the DC+ and DC- output terminals of the 220V to 24V switching power supply 1 respectively.

[0076] (6) Use power connection wires 2, 23, and 24 with aviation plugs, such as... Figure 1 As shown, the high-voltage positive line 24 of the tubular cryogenic plasma generator 32 is connected to the DC+ output terminal of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3, and the high-voltage negative line 23 of the tubular cryogenic plasma generator 32 is connected to the DC- output terminal of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3. The input terminal of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3 is electrically connected to the DC+ and DC- output terminals of the 220V to 24V switching power supply 1 through the power connection wire 2 with an aviation plug. The input terminal of the 220V to 24V switching power supply 1 is electrically connected to the mains live wire and neutral wire. This completes the assembly of the modular tubular cryogenic plasma generator.

[0077] In this embodiment of the application, after the mains control switch is closed and the power is turned on, the entire generator is in working condition, such as... Figure 1 As shown, compressed air 20, introduced through compressed air inlet connecting pipe 6, enters the inner cavity of tubular low-temperature plasma generator 32. In its inner cavity channel, the air is excited and ionized by the applied DC high-frequency high-voltage electric field to generate low-temperature plasma 21. Under the action of gas pressure, the generated low-temperature plasma 21 is discharged from the inner cavity channel through low-temperature plasma outlet pipe 19. The discharged low-temperature plasma is coupled to other technical equipment such as micro-nano bubble generator, jet aerator, venturi mixer, or micron-level titanium alloy aeration disc and applied to actual scenarios. The modular tubular low-temperature plasma generator in this application can be combined and arranged to manufacture high-end low-temperature plasma equipment of different specifications and models, mainly used in multiple different fields such as ecological environment management, saline-alkali land management, agricultural planting, animal husbandry and aquaculture.

[0078] Based on the effects and test results of the successfully manufactured low-temperature plasma high-end equipment in small-scale and pilot-scale experiments and its practical application, the modular tubular low-temperature plasma generator and low-temperature plasma high-end equipment proposed in this embodiment have significant effects on reducing, rendering harmless, and facilitating resource utilization of municipal biochemical waste sludge in the field of ecological environment governance. The sludge reduction in small-scale experiments can reach up to 97%, and the average sludge reduction in pilot-scale low-temperature plasma high-end equipment reaches 90%. The average removal rate of organic matter in the sludge reaches over 99%, bacteria and viruses in the sludge are almost completely killed, and 99% of the sludge odor is removed. Compared with ozone advanced oxidation, this application is more effective in removing organic matter from municipal sewage and industrial wastewater. The removal effect of pollutants such as organic matter, ammonia nitrogen, and total cyanide is very significant, which can significantly reduce treatment costs and increase social and economic benefits. The removal rate of organic matter is 90-100% (the removal rate of organic matter by ozone advanced oxidation is 60-80%), the removal rate of ammonia nitrogen is 90-100% on average (the removal rate of ammonia nitrogen by ozone advanced oxidation is 40-60%), and the removal rate of total cyanide is 90%-100% (the removal rate of total cyanide by ozone advanced oxidation is 50-70%). The energy consumption of the low-temperature plasma high-end equipment in this pilot project is only 1 / 15 of that of the ozone advanced oxidation equipment, which greatly reduces energy consumption costs and significantly improves treatment efficiency. More practical application scenarios are under continuous development.

[0079] In this embodiment, the modular tubular low-temperature plasma generator has the following three major advantages and features compared with the traditional tubular ozone generators and novel plate ozone generators currently on the market:

[0080] The tubular low-temperature plasma generator 32 in this application produces ionized gas, which includes a mixture of free electrons, high-energy ions, active free radicals and nascent oxygen, etc. In contrast, the ozone generator only produces a single gaseous molecule - ozone. Therefore, the low-temperature plasma has a higher electron volt energy density and a stronger redox potential.

[0081] When treating pollutants such as organic matter in wastewater, ozone generators generally face problems such as high energy consumption, dependence on complex supporting equipment and facilities, cumbersome maintenance procedures, and high operating costs. In contrast, under the same treatment conditions, the energy consumption of the tubular low-temperature plasma generator 32 in this application is only one-fifteenth of that of the ozone generator. In addition, the tubular low-temperature plasma generator 32 only requires an air compressor to provide air as a supporting equipment, and the required supporting equipment and facilities are relatively simple. Its modular design makes maintenance more convenient and the operating cost is relatively low.

[0082] When treating pollutants such as organic matter in wastewater, the removal rate of ozone generators is usually between 60% and 80%. In contrast, under the same treatment conditions, the removal rate of pollutants by the tubular low-temperature plasma generator 32 in this application is as high as 90% to 100%.

[0083] In summary, this application demonstrates significant value and importance in the field of ecological environment governance. It not only provides new ideas and methods for current environmental protection work, but also, with continuous technological progress and innovation, more application scenarios are being developed and expanded in order to achieve more comprehensive and in-depth ecological environment governance results.

[0084] Example 2

[0085] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiment 1 only in that the outer contour diameter of the concentric circle connecting bracket 12 is 1.75-2.87 times the outer contour diameter of the microneedle 16, and more preferably, the outer contour diameter of the concentric circle connecting bracket 12 is 2.29 times the outer contour diameter of the microneedle 16.

[0086] Example 3

[0087] like Figure 1 , Figure 2 , Figure 17 , Figure 18 , Figure 20 and Figure 21 As shown, this embodiment proposes a modular tubular low-temperature plasma generator. The only difference between this embodiment and Embodiment 1 and Embodiment 2 is that the microneedle 16 is a solid microneedle, and the microneedle group is provided with 6 microneedles 16, 5 metal spacer sleeves 15, and 1 anti-loosening nut 34.

[0088] Example 4

[0089] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, and 3 only in that the outer contour diameter of the microneedle sheet 16 is preferably 36.5 mm, the thickness of the microneedle sheet 16 is preferably 0.4 mm, the length of the microneedle is preferably 3.0 mm, the number of microneedles in the microneedle sheet 16 is preferably 90, the diameter of the microneedle is preferably 100 micrometers, the distance between adjacent microneedle tips is preferably 1.27 mm, and the diameter of the central shaft hole of the microneedle sheet 16 is preferably 2.85 mm.

[0090] Example 5

[0091] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, and 4 only in that the thickness of the insulating dielectric coating inside the negative electrode 22 of the metal dielectric sleeve is preferably 0.5 mm.

[0092] Example 6

[0093] This embodiment proposes a modular tubular low-temperature plasma generator, which, based on Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4 or Embodiment 5, further specifies that the Ϙ-shaped metal ring 25 welded to one end of the high-voltage negative electrode line 23 is made of the same material as the metal dielectric sleeve negative electrode 22.

[0094] Example 7

[0095] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, and 6 only in that the working electric field voltage in the cavity of the negative electrode 22 of the metal dielectric sheath is a DC high voltage of 22KV.

[0096] Example 8

[0097] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, and 7 only in that the distance between the tip of the microneedle 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve is preferably 22 mm.

[0098] Example 9

[0099] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, 7, and 8 only in that the insulating tube 10 is preferably made of polytetrafluoroethylene (PTFE), and preferably has an axial length of 150 mm, an inner diameter of 80 mm, a wall thickness of 3 mm, and an outer diameter of 86 mm. The inner diameter of the insulating tube 10 is preferably 0.5 mm larger than the outer diameter of the metal dielectric sleeve negative electrode 22. The insulating tube 10 and the metal dielectric sleeve negative electrode 22 are coaxial, and the axial length of the insulating tube 10 is preferably 75 mm larger than the axial length of the metal dielectric sleeve negative electrode 22. The installation position of the metal dielectric sleeve negative electrode 22 is located in the lower middle part of the inner cavity of the insulating tube 10.

[0100] Example 10

[0101] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, 7, 8, and 9 only in that the working pulse width of the 100-nanosecond-level DC high-frequency high-voltage power supply host 3 is 200-400ns, the high frequency is 15-18KHz, and the DC high voltage is 20-25KV.

[0102] Example 11

[0103] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10 only in that the axial length of the metal dielectric sleeve negative electrode 22 is 75mm, the inner diameter of the tube is 73.5mm, the wall thickness is 3mm, and the outer diameter is 79.5mm. The preferred dimensions of the Ϙ-shaped groove 27 are a cylindrical diameter of 3mm and a height of 1.5mm, a Ϙ-shaped groove diameter of 9mm, a groove width of 3mm, and a groove depth of 1.5mm, and the tail length of the Ϙ-shaped groove is the length from the outer wall edge of the metal dielectric sleeve negative electrode 22 to the groove, which is 10mm.

[0104] Example 12

[0105] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11 only in that the tubular finned heat sink 9 is preferably made of aluminum alloy, and preferably has a cross-section of a sunflower-shaped heat sink with eight M6 internal thread mounting holes 33. The thread depth of the eight M6 internal thread mounting holes 33 is 25mm, the axial length of the tubular finned heat sink 9 is 200mm, the inner cavity diameter is 86.5mm, the wall thickness is 4.5mm, the fin height is 15mm, the fin thickness is 2mm, and the outer diameter of the tubular finned heat sink 9 is 125.5mm.

[0106] Example 13

[0107] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, and 12 only in that the compressed air inlet end cap assembly 7 is preferably made of polytetrafluoroethylene (PTFE) sheet with a total thickness of 20mm and an outer diameter of 125.5mm. The end cap has eight lifting lug mounting holes aligned with the tubular finned heat sink 9, which has eight M6 internal thread mounting holes 33. The through-hole size is 8mm. A G1 / 2 threaded air inlet hole with a thread depth of 20mm is provided at the center of the front of the end cap. A 1mm recessed, 24mm diameter O-ring groove is concentrically provided with the G1 / 2 threaded air inlet hole at the center of the front of the end cap. The G1 / 2 threaded air inlet hole at the center of the front of the end cap is used to install the compressed air inlet pipe 6. The end cap features a G1 / 2 threaded air inlet hole at its center and two M20 threaded holes on either side, each with a thread depth of 20mm. All three holes are centered on the same line, with a center-to-center distance of 28mm between adjacent holes. A 1mm deep, 24mm diameter O-ring groove is concentrically positioned between the two M20 threaded holes on the front of the end cap. These two M20 threaded holes are used to install M20 type 304 stainless steel flanges. One flange allows the high-voltage positive power cable to pass through and is locked in place to prevent leakage. The other flange allows the high-voltage negative power cable to pass through and is locked in place to prevent leakage. The back of the end cap is machined into a protruding circular sealing plug structure with an outer diameter of 86.5mm. The total thickness of the end cap is 20mm, the height of the circular sealing plug is 8mm, and the remaining portion is thinned to a thickness of 12mm.

[0108] Example 14

[0109] This embodiment proposes a modular tubular low-temperature plasma generator. Its difference from Embodiments 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 13 lies solely in that the low-temperature plasma outlet end cap assembly 18 is preferably made of polytetrafluoroethylene (PTFE) sheet with a total thickness of 20 mm and an outer diameter of 125.5 mm. The end cap is provided with eight lifting lug mounting holes, the holes of which are aligned with the tubular finned heat sink 9, whose cross-section has eight M6 internal thread mounting holes 33. The perforation is 8mm in size. A G1 / 2 threaded vent hole with a thread depth of 20mm is set in the center of the front of the end cap. A 24mm diameter O-ring groove with a recessed depth of 1mm is set concentrically in the G1 / 2 threaded vent hole in the center of the front of the end cap. The G1 / 2 threaded vent hole in the center of the front of the end cap is used to install the low-temperature plasma outlet pipe 19. The back of the end cap is machined into a protruding circular sealing plug structure with an outer diameter of 86.5mm. The total thickness of the end cap is 20mm, the height of the circular sealing plug is 8mm, and the rest is thinned to a thickness of 12mm.

[0110] Example 15

[0111] This embodiment proposes a modular tubular low-temperature plasma generator, which differs from Embodiments 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14 only in that the cooling fan 35 preferably uses DC24V power supply, the maximum fan speed is 7500 rpm, and the four mounting holes of the cooling fan 35 correspond to four mounting holes of the low-temperature plasma outlet end cap assembly 18, and are connected and fastened with an extended through-thread nut 36.

[0112] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0113] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A modular tubular cryogenic plasma generator, characterized in that, The system includes a 100-nanosecond-level DC high-frequency high-voltage power supply main unit, a microneedle group high-voltage positive electrode, a high-voltage positive wire, a metal dielectric sheath negative electrode, a high-voltage negative wire, an isolation sleeve, a concentric circle connecting bracket, an insulating tube, a tubular finned heat sink, a compressed air inlet end cap assembly, and a low-temperature plasma outlet end cap assembly. The microneedle group high-voltage positive electrode has a cylindrical pin at its top. One end of the high-voltage positive wire is connected to the positive high-voltage output port of the 100-nanosecond-level DC high-frequency high-voltage power supply main unit, and the other end of the high-voltage positive wire has a nut post. Both ends of the isolation sleeve are fixedly connected to the bottom ends of the cylindrical pin and the nut post, respectively. The top end of the nut post is connected to the concentric circle connecting bracket. The bottom center area is fixedly connected, and the high-voltage negative electrode wire is connected to the negative high-voltage output port of the 100-nanosecond DC high-frequency high-voltage power supply host. The metal dielectric sleeve negative electrode is sleeved on the outside of the high-voltage positive electrode of the microneedle group and is bonded and fixed to the inner wall of the insulating tube. The bottom outer edge of the concentric circle connecting bracket is bonded and fixed to the top of the insulating tube to form a low-temperature plasma generator. The tubular finned heat sink is sleeved on the outside of the low-temperature plasma generator, and the top and bottom of the tubular finned heat sink are fixedly sealed to the compressed air inlet end cap assembly and the low-temperature plasma outlet end cap assembly, respectively.

2. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, The pulse width of the 100-nanosecond DC high-frequency high-voltage power supply host is 100~600ns, the input voltage is DC 24~30V, the output voltage is DC 18~100KV, and the frequency is 15~50KHz.

3. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, It also includes power connection wires and a switching power supply. The power connection wires include a DC power positive connection wire, a DC power negative connection wire, an AC neutral connection wire, and an AC live connection wire. The positive DC input terminal of the nanosecond-level DC high-frequency high-voltage power supply host is electrically connected to the positive DC output terminal of the switching power supply through the DC power positive connection wire. The negative DC input terminal of the nanosecond-level DC high-frequency high-voltage power supply host is electrically connected to the negative DC output terminal of the switching power supply through the DC power negative connection wire. The neutral wire of the AC input terminal of the switching power supply is electrically connected to the neutral output terminal of the 220V AC power control switch through the AC neutral connection wire. The live wire of the AC input terminal of the switching power supply is electrically connected to the live output terminal of the 220V AC power control switch through the AC live connection wire.

4. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, The high-voltage positive electrode of the microneedle assembly includes multiple microneedles, multiple metal spacer sleeves, a Torx screw rod, and an anti-loosening nut. Each of the microneedles is stacked along the axial direction of the spacer sleeve. A metal spacer sleeve is provided between each pair of adjacent microneedles. The Torx screw rod passes through each of the microneedles and each of the metal spacer sleeves in sequence, engages with the anti-loosening nut, and is fixedly connected with the cylindrical pin.

5. The modular tubular cryogenic plasma generator according to claim 4, characterized in that, Each of the microneedles is either a hollow microneedle sheet in the middle or a solid microneedle sheet.

6. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, The concentric circular connecting bracket includes an outer adhesive fixing ring, a concentric central ring, and multiple connecting brackets. The diameter of the concentric central ring is smaller than the diameter of the outer adhesive fixing ring. One end of each connecting bracket is connected to the inner peripheral wall of the outer adhesive fixing ring, and the other end of each connecting bracket is connected to the outer peripheral wall of the concentric central ring.

7. The modular tubular cryogenic plasma generator according to claim 6, characterized in that, A circular groove is provided on the outer peripheral wall of the outer adhesive fixing ring, and a wiring hole is formed between the circular groove and the inner wall of the insulating tube for the high voltage negative electrode wire to pass through.

8. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, One end of the high-voltage negative electrode line is provided with an Ϙ-shaped metal ring, and an Ϙ-shaped groove is provided on the outer wall of the metal dielectric sleeve negative electrode for embedding the Ϙ-shaped metal ring.

9. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, The inner wall of the negative electrode of the metal dielectric sleeve is provided with a dielectric coating.

10. The modular tubular cryogenic plasma generator according to claim 1, characterized in that, It also includes a cooling fan, which is mounted below the low-temperature plasma outlet end cover assembly and is fixedly connected to the low-temperature plasma outlet end cover assembly via an extended through-threaded nut.

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