Modularized tubular low-temperature plasma generator

Abstract

The modular tubular low-temperature plasma generator is characterized in that a cylindrical pin is arranged at the top end of a microneedle group high-voltage positive electrode, 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 method has the beneficial effects that energy consumption can be reduced, the requirements of corollary equipment and facilities are reduced, and the plasma yield is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma generators, and more particularly, to a modular tubular low-temperature plasma generator. Background Art

[0002] In recent years, the low-temperature plasma technology has become an emerging research hotspot. A low-temperature plasma generator generally refers to a device component for generating low-temperature plasma. Low-temperature plasma is a partially ionized gas, in which the concentrations of electrons and ions are relatively low, but it still exhibits significant electromagnetic and chemical reaction characteristics. This kind of plasma plays an important role in various applications, such as surface treatment, waste gas treatment, biomedicine, etc.

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

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

[0005] The technical problem to be solved by the present invention is how to reduce energy consumption, reduce the requirements for supporting equipment and facilities, and increase the plasma production. To overcome the above defects of the prior art (or related technologies), the present invention provides a modular tubular low-temperature plasma generator.

[0006] The present invention provides a modular tube-type low-temperature plasma generator, which includes a nanosecond-level DC high-frequency high-voltage power supply host, a high-voltage positive electrode of a micro-needle group, a high-voltage positive electrode wire, a metal dielectric sleeve negative electrode, a high-voltage negative electrode wire, an isolation sleeve, a concentric circle connection bracket, an insulating tube, a tube-type fin radiator, a compressed air inlet end cover assembly, and a low-temperature plasma outlet end cover assembly. A cylindrical pin is provided at the top end of the high-voltage positive electrode of the micro-needle group. One end of the high-voltage positive electrode wire is connected to the positive high-voltage output port of the nanosecond-level DC high-frequency high-voltage power supply host, and a nut column is provided at the other end of the high-voltage positive electrode wire. The two ends of the isolation sleeve are respectively fixedly connected to the cylindrical pin and the bottom end of the nut column, and the top end of the nut column is fixedly connected to the central area at the bottom end of the concentric circle connection bracket. The high-voltage negative electrode wire is connected to the metal dielectric sleeve negative electrode for connecting to the negative high-voltage output port of the nanosecond-level DC high-frequency high-voltage power supply host. The metal dielectric sleeve negative electrode is sleeved outside the high-voltage positive electrode of the micro-needle group and is adhesively fixed to the inner wall of the insulating tube. The outer edge at the bottom end of the concentric circle connection bracket is adhesively fixed to the top end of the insulating tube to form a low-temperature plasma generator. The tube-type fin radiator is sleeved outside the low-temperature plasma generator, and the top end and the bottom end of the tube-type fin radiator are respectively fixedly sealed to the compressed air inlet end cover assembly and the low-temperature plasma outlet end cover assembly.

[0007] Compared with the prior art, a modular tube-type low-temperature plasma generator of the present application has the following advantages: In the present application, the high-voltage positive electrode of the micro-needle group, the metal dielectric sleeve negative electrode, the isolation sleeve, the concentric circle connection bracket, the insulating tube, the tube-type fin radiator, the compressed air inlet end cover assembly, and the low-temperature plasma outlet end cover assembly are integrated to form a modular tube-type low-temperature plasma generator with a small volume. The high-voltage positive electrode of the micro-needle group uses a corona high-frequency high-voltage discharge method with a micron-level tip coupling toroidal surface to generate low-temperature plasma, extremely significantly improving the electron volt energy density and the plasma production per unit volume; and the overall modular design with a tube structure is adopted to reduce the volume of the generator, only requiring a nanosecond-level DC high-frequency high-voltage power supply host as a supporting device, without the need for other power supply devices and power-consuming devices, effectively reducing energy consumption while reducing the requirements for supporting equipment and facilities.

[0008] In a possible implementation manner, the pulse width of the nanosecond-level DC high-frequency high-voltage power supply host is 100 - 600 ns, the input voltage is DC 24 - 30 V, the output voltage is DC 18 - 100 KV, and the frequency is 15 - 50 KHz.

[0009] In a possible implementation, it further includes a power connection wire and a switching power supply. The power connection wire includes a DC power positive connection wire, a DC power negative connection wire, a mains AC neutral connection wire, and a mains AC live connection wire. The positive pole of the DC input end of the nanosecond-level DC high-frequency high-voltage power supply host is electrically connected to the positive pole of the DC output end of the switching power supply through the DC power positive connection wire. The negative pole of the DC input end of the nanosecond-level DC high-frequency high-voltage power supply host is electrically connected to the negative pole of the DC output end of the switching power supply through the DC power negative connection wire. The neutral wire of the AC input end of the switching power supply is electrically connected to the neutral wire output end of the 220V mains control switch through the mains AC neutral connection wire. The live wire of the AC input end of the switching power supply is electrically connected to the live wire output end of the 220V mains control switch through the mains AC live connection wire.

[0010] Compared with the prior art, adopting the above technical solution can achieve physical isolation between strong electricity and weak electricity through the four-wire independent wiring scheme of the DC power positive connection wire, the DC power negative connection wire, the mains AC neutral connection wire, and the mains AC live connection wire. Moreover, the segmented management of the 220V mains control switch and the switching power supply reduces the standby power consumption.

[0011] In a possible implementation, the high-voltage positive electrode of the micro-needle group includes a plurality of micro-needle sheets, a plurality of metal spacer sleeves, a plum blossom screw rod, and a locknut. Each of the micro-needle sheets is stacked along the axial direction of the isolation sleeve. A metal spacer sleeve is provided between every two adjacent micro-needle sheets. The plum blossom screw rod sequentially passes through each of the micro-needle sheets and each of the metal spacer sleeves and cooperates with the locknut, and is fixedly connected to the cylindrical pin.

[0012] Compared with the prior art, adopting the above technical solution can utilize the axial pre-tightening structure of the plum blossom screw rod and the equidistant distribution method of the metal spacer sleeves to form a three-dimensional discharge array of micro-needle sheets, improve the low-temperature plasma output, and ensure long-term discharge stability.

[0013] In a possible implementation, each of the micro-needle sheets is a middle-hollowed micro-needle sheet or a solid micro-needle sheet.

[0014] In a possible implementation, the concentric circle connection bracket includes an outer adhesively fixed ring, a concentric center ring, and a plurality of connection brackets. The diameter of the concentric center ring is smaller than the diameter of the outer adhesively fixed ring. One end of each of the connection brackets is connected to the inner peripheral wall of the outer adhesively fixed ring, and the other end of each of the connection brackets is connected to the outer peripheral wall of the concentric center ring.

[0015] Compared with the prior art, adopting the above technical solution can stably connect the outer adhesively fixed ring and the concentric center ring through the connection brackets to ensure stability.

[0016] In a possible implementation, a circular groove is provided on the outer peripheral wall of the outer bonding and fixing ring, and a wire routing hole is formed between the circular groove and the inner wall of the insulating tube for the high-voltage negative wire to pass through.

[0017] Compared with the prior art, the above technical solution can form a wire routing hole through the circular groove and the inner wall of the insulating tube, providing a separate space to accommodate the high-voltage negative wire and effectively improving the space utilization rate.

[0018] In a possible implementation, one end of the high-voltage negative wire is provided with a Ϙ-shaped metal ring, and a Ϙ-shaped card slot is provided on the outer wall of the negative electrode of the metal dielectric sleeve for embedding the Ϙ-shaped metal ring.

[0019] Compared with the prior art, the above technical solution can utilize the dovetail locking structure of the Ϙ-shaped card slot to ensure the firmness of the Ϙ-shaped metal ring.

[0020] In a possible implementation, a dielectric coating is provided on the inner wall of the negative electrode of the metal dielectric sleeve.

[0021] In a possible implementation, a cooling fan is further included, and the cooling fan is installed below the low-temperature plasma outlet end cover assembly and is fixedly connected to the low-temperature plasma outlet end cover assembly through an extended through-thread screw nut. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a perspective schematic view of the overall structure of the present invention; Figure 2 is an exploded schematic view of the present invention; Figure 3 is a schematic view of the gland head structure of the present invention; Figure 4 is a schematic view of the structure of the compressed air inlet end cover assembly and the pipeline interface of the present invention; Figure 5 is a schematic view of the structure of the tube fin radiator of the present invention; Figure 6 is a schematic view of the structure of the concentric circle connection bracket of the present invention; Figure 7 is a schematic view of the structure of the high-voltage positive wire of the present invention; Figure 8 is a schematic view of the structure of the high-voltage negative wire of the present invention; Figure 9 is a schematic view of the structure of the insulating tube of the present invention; Figure 10 is a schematic view of the structure of the negative electrode of the metal dielectric sleeve of the present invention; Figure 11Schematic structural diagram of the microneedle patch of the present invention; Figure 12 Schematic structural diagram of the metal spacer sleeve of the present invention; Figure 13 Schematic structural diagram of the cylindrical pin of the present invention; Figure 14 Schematic structural diagram of the isolation sleeve of the present invention; Figure 15 Schematic structural diagram of the low-temperature plasma outlet end cap assembly and pipeline interface of the present invention; Figure 16 Top view of the internal structure of the tubular low-temperature plasma generator of the present invention; Figure 17 Perspective schematic structural diagram of the high-voltage positive electrode of the microneedle group of the present invention; Figure 18 Perspective schematic structural diagram of the assembly of the high-voltage positive electrode of the microneedle group and the concentric circle connection bracket of the present invention; Figure 19 Schematic structural diagram of the high-voltage negative electrode of the present invention; Figure 20 Perspective schematic structural diagram of the low-temperature plasma generator of the present invention; Figure 21 Perspective schematic structural diagram of the tubular low-temperature plasma generator of the present invention; Explanation of reference numerals: 1. Switching power supply; 2. Power connection wire; 3. Power supply host; 4. Sealed and locked gland for high-voltage negative power supply line; 5. Sealed and locked gland for high-voltage positive power supply line; 6. Compressed air inlet connection pipeline; 7. Compressed air inlet end cap assembly; 8. Fixing screw; 9. Tubular fin radiator; 10. Insulating tube; 11. Nut column; 12. Concentric circle connection bracket; 13. Isolation sleeve; 14. Cylindrical pin; 15. Metal spacer sleeve; 16. Microneedle patch; 17. Plum blossom screw rod; 18. Low-temperature plasma outlet end cap assembly; 19. Low-temperature plasma outlet pipeline; 20. Compressed air; 21. Low-temperature plasma; 22. Metal dielectric sleeve negative electrode; 23. High-voltage negative wire; 24. High-voltage positive wire; 25. Ϙ-shaped metal ring; 26. High-voltage negative wire wire groove; 27. Ϙ-shaped card slot; 28. Outer bonding fixed ring; 29. Concentric center ring; 30. Connection 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. High-voltage positive electrode of microneedle group; 38. Assembly of high-voltage positive electrode of microneedle group and concentric circle connection bracket; 39. High-voltage negative electrode; 40. Low-temperature plasma generator. Detailed implementation manners

[0023] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0024] The following further describes this application in detail with reference to the drawings and specific embodiments.

[0025] Embodiment 1 See Figure 1 、 Figures 2 - 16 and Figure 17 , an embodiment of this application discloses a modular tube-type low-temperature plasma generator, which mainly includes a tube-type low-temperature plasma generator 32, a nanosecond-level DC high-frequency high-voltage power supply host 3, a power connection wire 2, a cooling fan 35, etc. The tube-type low-temperature plasma generator 32 specifically includes a micro-needle group high-voltage positive electrode 37, a metal dielectric sleeve negative electrode 22, an isolation sleeve 13, a concentric circle connection bracket 12, an insulating tube 10, a tube-type fin radiator 9, a compressed air inlet end cover assembly 7, a low-temperature plasma outlet end cover assembly 18, a high-voltage negative wire 23, a high-voltage positive wire 24; the micro-needle group high-voltage positive electrode 37, the isolation sleeve 13 and the concentric circle connection bracket 12 are jointly assembled into a micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38, the high-voltage negative wire 23 with a Ϙ-shaped metal ring 25 welded at one end and the metal dielectric sleeve negative electrode 22 are jointly assembled into a high-voltage negative electrode 39, the outer wall of the metal dielectric sleeve negative electrode 22 is coated with an adhesive and adhesively fixed to the inner wall of the insulating tube 10, the metal dielectric sleeve negative electrode 22 is sleeved outside the micro-needle group high-voltage positive electrode 37. After adjusting the concentricity between the micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38 and the metal dielectric sleeve negative electrode 22 in the high-voltage negative electrode 39, the outer adhesive fixed ring 28 of the concentric circle connection bracket 12 is adhesively fixed to the insulating tube 10 and then assembled into a low-temperature plasma generator 40. The low-temperature plasma generator 40 is installed in the tube-type fin radiator 9, and the compressed air inlet end cover assembly 7, the low-temperature plasma outlet end cover assembly 18 and the fixing screws 8 are used to jointly assemble the tube-type low-temperature plasma generator 32; the above-mentioned 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.

[0026] As Figure 1As shown in the figure, the high-voltage positive electrode line 24 of the tubular low-temperature plasma generator 32 passes through the high-voltage positive power supply line sealing and locking gland 5 and is connected to the DC+ output terminal of the nanosecond-level DC high-frequency high-voltage power supply host 3. The high-voltage negative electrode line 23 of the tubular low-temperature plasma generator 32 passes through the high-voltage negative power supply line sealing and locking gland 4 and is connected to the DC- output terminal of the nanosecond-level DC high-frequency high-voltage power supply host 3. The input terminal of the nanosecond-level DC high-frequency high-voltage power supply host 3 is electrically connected to the DC+ and DC- of the DC output terminal 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 live wire and neutral wire of the mains electricity.

[0027] In the embodiment of the present application, the pulse width of the nanosecond-level DC high-frequency high-voltage power supply host 3 is 100 - 600 ns, the input voltage is DC24 - 30V, the output voltage is DC18 - 100 KV, and the frequency is 15 - 50 KHz. Preferably, the pulse width is 100 - 400 ns, the preferred output voltage is 20 - 30 KV, and the preferred frequency is 15 - 20 KHz. As a further preferred solution, the working pulse width of the nanosecond-level DC high-frequency high-voltage power supply host 3 in this embodiment is 200 - 400 ns, the frequency is 15 - 18 KHz, and the output voltage is 20 - 25 KV.

[0028] In the embodiment of the present application, quick plugs are connected to both the high-voltage negative electrode line 23 and the high-voltage positive electrode line 24. They are all conventional commercially available DC silicone wires and high-voltage plugs, specifically double-insulated silicone wires and high-voltage plugs with a tinned copper wire core resistant to DC high voltage of 30 - 250 KV. Further, double-insulated silicone wires and high-voltage plugs with a tinned copper wire core resistant to DC high voltage of 30 - 50 KV can be preferably used.

[0029] In the embodiment of the present application, the micro-needle group of the micro-needle group high-voltage positive electrode 37 includes a plurality of micro-needle sheets 16. The adjacent micro-needle sheets 16 are spaced by a metal spacer sleeve 15. The metal spacer sleeve 15 is preferably made of stainless steel. All the micro-needle sheets 16 and the metal spacer sleeve 15 are coaxially and conformally arranged, and are sequentially penetrated and connected by a plum blossom screw rod 17 and then fastened with a locknut 34, and then connected to a cylindrical pin 14, as Figure 1 、 Figure 2 and Figure 17 shown; the micro-needle group high-voltage positive electrode 37, the isolation sleeve 13, and the concentric circle connection bracket 12 are jointly assembled into the micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38, as Figure 18 shown.

[0030] In the embodiments of the present application, generally 3 to 12 microneedle sheets 16 are provided in the microneedle group. The distance between adjacent microneedle sheets 16 is 8 mm or 10 mm. Generally, the interval between adjacent microneedle sheets 16 is realized by a metal spacer sleeve 15, that is, the axial length of the metal spacer sleeve 15 is the distance between adjacent microneedle sheets 16. According to different discharge powers and concentrations of generated low-temperature plasma, 3, 6, 9 or 12 microneedle sheets 16 can be preferably selected to form the microneedle group. When the microneedle group adopts different numbers of microneedle sheets 16, the interval between the microneedle sheets 16 is also adjusted accordingly. For example, when the microneedle group is provided with 3 or 6 microneedle sheets 16, the interval distance between adjacent microneedle sheets 16 is 8 mm (that is, the axial length of the metal spacer sleeve 15 closely arranged between adjacent microneedle sheets 16 is 8 mm), while when the microneedle group is provided with 9 or 12 microneedle sheets 16, the interval distance between adjacent microneedle sheets 16 is 10 mm (that is, the axial length of the metal spacer sleeve 15 closely arranged between adjacent microneedle sheets 16 is 10 mm).

[0031] In the embodiments of the present application, the microneedle sheet 16 is preferably a solid microneedle sheet. In the same microneedle group, generally the structures and sizes of all the microneedle sheets 16 are completely the same. As a preferred solution, the outer periphery of the microneedle sheet 16 is needle-shaped. The outer contour diameter of the microneedle sheet 16 (that is, the diameter of the ring where the needle tip is located) is 30 - 63 mm, the thickness of the microneedle sheet 16 is 0.2 - 0.5 mm, the needle length is 2.0 - 4.0 mm, the number of needles of the microneedle sheet 16 is 80 - 100, the needle diameter is 50 - 150 microns, the distance between adjacent needle tips is 1.04 - 2.19 mm, and the diameter of the central axis hole is 2.85 - 3.85 mm. As a further specific preferred solution, the outer contour diameter of the microneedle sheet 16 is 36.5 mm, the thickness of the microneedle sheet 16 is 0.4 mm, the needle length is 3.0 mm, the number of needles of the microneedle sheet 16 is 90, the needle diameter is 100 microns, the distance between adjacent needle tips is 1.27 mm, and the diameter of the central axis hole is 2.85 mm. As shown in Figure 2 and Figure 11 Figure 7, it is a schematic structural diagram of the microneedle group provided with six microneedle sheets 16.

[0032] In the embodiments of the present application, the material of the microneedle sheet 16 is 304 stainless steel, 316 stainless steel, titanium alloy, pure titanium, titanium plated with platinum, titanium plated with platinum iridium, titanium plated with ruthenium iridium, etc. Among them, titanium alloy, titanium plated with platinum and titanium plated with platinum iridium are preferably used.

[0033] In the embodiment of the present application, the concentric circle connection bracket 12 specifically includes an outer adhesive fixed ring 28, a concentric center ring 29, a connection bracket 30, and a wire routing hole 31. The concentric center ring 29 is located inside the outer adhesive fixed ring 28 and is concentrically arranged with the outer adhesive fixed ring 28. The connection bracket 30 is located in the annular space formed by the outer circle of the concentric center ring 29 and the inner circle of the outer adhesive fixed ring 28. The three connection brackets 30 are located in the same plane. The tails of the three connection brackets 30 converge and are connected to the concentric center ring 29. The heads of the three connection brackets 30 are unfolded and arranged at an angle of 120° intervals from each other. The heads of the three connection brackets 30 are all connected to the outer adhesive fixed ring 28. During assembly, the concentric circle connection bracket 12 is concentrically sleeved on Figure 7 the nut column 11 injection-molded and wrapped at one end of the medium-high voltage positive electrode power connection wire, and is assembled with the micro-needle group high-voltage positive electrode 37 into the micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38.

[0034] In the embodiment of the present application, it is preferred that the outer contour diameter of the concentric circle connection bracket 12 is greater than the outer contour diameter of the micro-needle sheet 16. Specifically, it is preferred that the outer contour diameter of the concentric circle connection bracket 12 is 1.75 - 2.87 times the outer contour diameter of the micro-needle sheet 16. Further preferably, the outer contour diameter of the concentric circle connection bracket 12 is 2.36 times the outer contour diameter of the micro-needle sheet 16.

[0035] In the embodiment of the present application, the material of the concentric circle connection bracket 12 is preferably carbon fiber, carbon nanofiber, epoxy resin fiberglass, silicon carbide resin fiber, polytetrafluoroethylene, etc. Specifically, it is preferred that the concentric circle connection bracket 12 is processed from an epoxy resin fiberglass board.

[0036] In the embodiment of the present application, the metal dielectric sleeve negative electrode 22 is specifically sleeved outside the micro-needle group. The outer wall of the metal dielectric sleeve negative electrode 22 is provided with a Ϙ-shaped card slot 27 for clamping and positioning the Ϙ-shaped metal ring 25 and a high-voltage negative wire wire groove 26 for routing the high-voltage negative wire 23. The Ϙ-shaped metal ring 25 welded at one end of the high-voltage negative wire 23 is clamped on the Ϙ-shaped card slot 27 on the outer wall of the metal dielectric sleeve negative electrode 22 and welded firmly. Thus, the Figure 19 high-voltage negative electrode 39 is assembled. Specifically, in this embodiment, it is preferred that the axial length of the metal dielectric sleeve negative electrode 22 is 75 mm, the inner diameter of the tube is 73.5 mm, the wall thickness of the tube is 3 mm, the outer diameter of the tube is 79.5 mm. The size of the Ϙ-shaped card slot 27 is preferably a cylinder diameter of 3 mm, a height of 1.5 mm, a diameter of the Ϙ-shaped card slot 27 of 9 mm, a groove width of 3 mm, a groove depth of 1.5 mm. The tail length of the Ϙ-shaped card slot 27 is the length from the outer wall edge of the metal dielectric sleeve negative electrode 22 to the groove, and its length is 10 mm.

[0037] In the embodiment of the present application, the negative electrode 22 of the metal dielectric sleeve can be processed into short tubes with different diameter specifications and / or different length specifications according to actual needs, and can be matched and adjusted according to the voltage intensity of the DC positive high voltage and the DC negative high voltage in the tube.

[0038] In the embodiment of the present application, the negative electrode 22 of the metal dielectric sleeve can be based on stainless steel or zinc alloy or aluminum alloy or magnesium aluminum alloy pipe materials, specifically preferably aluminum alloy or magnesium aluminum alloy pipe materials. The inner wall of the negative electrode 22 of the metal dielectric sleeve is also treated with an insulating dielectric coating with insulating materials such as epoxy resin, polytetrafluoroethylene, and 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.

[0039] In the embodiment of the present application, preferably, the outer contour diameter of the micro-needle sheet 16 is proportional to the inner diameter of the negative electrode 22 of the metal dielectric sleeve; the distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve has an interval linear relationship with the voltage intensity in the electric field. For example, when the distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve is in the range of 20 - 100 mm, the ratio of the change in the voltage intensity in the electric field to the change in this distance is 1000 V / 1 mm; for example, with a working electric field voltage of 30 KV as the reference electric field voltage in the cavity of the negative electrode 22 of the metal dielectric sleeve, the standard distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve is 30 mm; for every 1000 V decrease in the working voltage, the distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve shrinks by 1 mm until the minimum distance is 20 mm; vice versa, for every 1000 V increase in the working electric field voltage, the distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve increases by 1 mm until the distance increases to 100 mm; as a preferred solution, during specific operation, the working electric field voltage in the above-mentioned negative electrode 22 of the metal dielectric sleeve is 22 KV of DC high voltage, and at the same time, preferably, the distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the negative electrode 22 of the metal dielectric sleeve is 22 mm.

[0040] In the embodiment of the present application, the insulating tube 10 can be processed from an epoxy resin fiberglass tube or a polytetrafluoroethylene tube, etc. Specifically, the insulating tube 10 is preferably made of a polytetrafluoroethylene tube. The inner diameter of the insulating tube 10 is preferably 0.5 mm larger than the outer diameter of the negative electrode 22 of the metal dielectric sleeve. The insulating tube 10 is coaxial with the negative electrode 22 of the metal dielectric sleeve, and the axial length of the insulating tube 10 is preferably 75 mm larger than the axial length of the negative electrode 22 of the metal dielectric sleeve. The installation position of the negative electrode 22 of the metal dielectric sleeve is in the middle and lower part of the inner cavity of the insulating tube 10.

[0041] In the embodiment of the present application, preferably, the axial length of the insulating tube 10 is 150 mm, the inner diameter of the tube is 80 mm, the wall thickness of the tube is 3 mm, and the outer diameter of the tube is 86 mm.

[0042] In the embodiment of the present application, the insulating tube 10 and the concentric circle connection bracket 12 have the same center and the same diameter. A wire routing hole 31 is further provided on the outer bonding fixed ring 28 of the concentric circle connection bracket 12. When the low-temperature plasma generator 40 is assembled, the inner wall of the insulating tube 10 is sleeved outside the outer bonding fixed ring 28. At this time, a wire routing hole 31 is formed between the wire routing hole 31 on the outer bonding fixed ring 28 of the concentric circle connection bracket 12 and the inner wall of the insulating tube 10 for the high-voltage negative wire 23 to pass through. The wire routing hole 31 on the outer bonding fixed ring 28 is preferably a semi-circular groove, and the semi-circular diameter size is preferably 0.5 mm larger than the outer diameter of the high-voltage negative wire 23. After the assembly is completed, the gap between the wire routing hole 31 and the high-voltage negative wire 23 is filled with glue for sealing.

[0043] In the embodiment of the present application, the inner cavity of the tubular fin radiator 9 is sleeved on the outer wall of the low-temperature plasma generator 40. The inner diameter of the inner cavity of the tubular fin radiator 9 is 0.5 mm larger than the outer diameter of the low-temperature plasma generator 40. The tubular fin radiator 9 is preferably made of aluminum alloy. Specifically, as a preferred solution, the cross-section of the tubular fin 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 fin 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 fin radiator 9 is 125.5 mm.

[0044] In the embodiment of the present application, the preferred material of the compressed air inlet end cover assembly 7 is made of polytetrafluoroethylene plate, with a total thickness of 20 mm, an outer diameter of the end cover of 125.5 mm. The end cover is provided with eight lug mounting hole plates, and the hole positions are aligned with the tubular fin radiator 9 with eight M6 female thread mounting holes 33 in the cross-section. The size of the perforation is 8 mm. A G1 / 2 threaded air inlet through-hole is provided at the exact center of the front of the end cover, with a thread depth of 20 mm. And a G1 / 2 threaded air inlet through-hole at the exact center of the front of the end cover is concentrically provided with an O-ring groove with a sinking depth of 1 mm and a diameter of 24 mm. The G1 / 2 threaded air inlet through-hole at the exact center of the front of the end cover is used to install the compressed air inlet pipeline 6. On both sides of the G1 / 2 threaded air inlet through-hole at the exact center of the front of the end cover, an M20 threaded through-hole is respectively provided, with a thread depth of 20 mm. The centers of the three holes are on the same center line, and the center distance between adjacent two holes is 28 mm. And an O-ring groove with a sinking depth of 1 mm and a diameter of 24 mm is concentrically provided for the two M20 threaded through-holes on the front of the end cover. The two M20 threaded through-holes on the front of the end cover are respectively used to install M20 type gland heads made of 304 stainless steel. One M20 type gland head made of 304 stainless steel is used for the high-voltage positive line 24 to pass through the perforation and is locked and sealed to prevent air leakage. The other M20 type gland head made of 304 stainless steel is used for the high-voltage negative line 23 to pass through the perforation and is locked and sealed to prevent air leakage. The back of the end cover is processed into a protruding circular seal structure. The outer diameter of the circular seal is 86.5 mm, the total thickness of the end cover is 20 mm, the height of the circular seal is 8 mm, and the rest is thinned to a thickness of 12 mm.

[0045] In the embodiment of the present application, the preferred material of the low-temperature plasma outlet end cover assembly 18 is made of polytetrafluoroethylene plate, with a total thickness of 20 mm, an outer diameter of the end cover of 125.5 mm. The end cover is provided with eight lug mounting hole plates, and the hole positions are aligned with the tubular fin radiator 9 with eight M6 female thread mounting holes 33 in the cross-section. The size of the perforation is 8 mm. A G1 / 2 threaded air outlet through-hole is provided at the exact center of the front of the end cover, with a thread depth of 20 mm. And a G1 / 2 threaded air outlet through-hole at the exact center of the front of the end cover is concentrically provided with an O-ring groove with a sinking depth of 1 mm and a diameter of 24 mm. The G1 / 2 threaded air outlet through-hole at the exact center of the front of the end cover is used to install the low-temperature plasma outlet pipeline 19. The back of the end cover is processed into a protruding circular seal structure. The outer diameter of the circular seal is 86.5 mm, the total thickness of the end cover is 20 mm, the height of the circular seal is 8 mm, and the rest is thinned to a thickness of 12 mm.

[0046] In the embodiment of the present application, the cooling fan 35 is preferably powered by DC 24V, the maximum rotation speed of the fan is 7500 revolutions per minute, and 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 fastened by a lengthened through-thread screw and nut 36.

[0047] In the embodiment of the present application, the assembly process and operating principle of the modular tubular low-temperature plasma generator are as follows: (1) One end of the plum blossom screw rod 17 sequentially passes through the center of the first micro-needle piece 16 and the first metal spacer sleeve 15, and then passes through the center of the second micro-needle piece 16 and the second metal spacer sleeve 15, and so on, until it passes through the center of the sixth micro-needle piece 16, and then is fastened with a locknut 34 to assemble six groups of micro-needle groups. The six groups of micro-needle groups are firmly connected to the inner threaded end of the inner and outer threaded cylinder pin with an extended high-voltage positive electrode. Then, an isolation sleeve 13 is put on, and then it is threadedly fastened to the inner-threaded circular nut column 11 injection-molded and wrapped at one end of the high-voltage positive electrode power connection wire embedded in the concentric center ring 29. Thus, the micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38 is assembled; (2) One end of the high-voltage negative wire 23 is welded to the Ϙ-shaped metal ring 25, which is sleeved on the Ϙ-shaped slot 27 on the outer wall of the metal dielectric sleeve negative electrode 22 and welded firmly. The Ϙ-shaped metal ring tail of the high-voltage negative tin copper wire welded to the high-voltage negative wire 23 is clamped in the high-voltage negative wire wire groove 26 and also welded firmly. Thus, the high-voltage negative electrode 39 is assembled; (3) The outer wall of the metal dielectric sleeve negative electrode 22 in the high-voltage negative electrode 39 is coated with an adhesive and adhesively fixed in the lower-middle part of the inner wall of the insulating tube 10. The specific position is that the lower edge of the metal dielectric sleeve negative electrode 22 is aligned with the inner wall of the insulating tube 10 and indented 20 mm inward from the lower edge. The high-voltage negative wire 23 and the quick plug in the high-voltage negative electrode 39 pass through the wire hole 31 in the micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38. After adjusting the concentricity of the micro-needle group high-voltage positive electrode and concentric circle connection bracket assembly 38 and the metal dielectric sleeve negative electrode 22 in the high-voltage negative electrode 39, the outer adhesive fixed ring 28 of the concentric circle connection bracket 12 is adhesively fixed to the insulating tube 10 with an adhesive. Thus, the low-temperature plasma generator 40 is assembled; (4) Push the low-temperature plasma generator 40 downward into the tube fin radiator 9, and adjust the distance between the lower edge of the lower opening of the low-temperature plasma generator 40 and the lower edge of the lower opening of the tube fin radiator 9 to 8 mm. Push the circular sealing plug protruding from the back of the compressed air inlet end cover assembly 7 downward, and then pass the high-voltage negative wire 23 and the high-voltage positive wire 24 through two corresponding M20 threaded holes in the compressed air inlet end cover assembly 7 respectively. After adjusting and aligning the installation hole positions, push the circular sealing plug protruding from the back of the compressed air inlet end cover assembly 7 into the inner cavity of the upper opening of the tube fin radiator 9. Use 8 fixing screws 8 to fasten and seal the compressed air inlet end cover assembly 7 and the tube fin radiator 9. The high-voltage negative wire 23 and the high-voltage positive wire 24 respectively pass through the high-voltage negative power supply line sealing and locking gland 4 and the high-voltage positive power supply line sealing and locking gland 5. Then, fasten and connect the high-voltage negative power supply line sealing and locking gland 4 and the high-voltage positive power supply line sealing and locking gland 5 to the corresponding M20 threaded holes respectively, and lock the two glands to prevent air leakage. Install the compressed air inlet connection pipeline 6 on the G1 / 2 threaded air inlet hole in the center of the front of the compressed air inlet end cover assembly 7. Push the circular sealing plug protruding from the back of the low-temperature plasma outlet end cover assembly 18 upward into the inner cavity of the lower opening of the tube fin radiator 9, adjust and align the installation hole positions, and use 4 fixing screws 8 to fasten and seal the low-temperature plasma outlet end cover assembly 18 and the tube fin radiator 9. Install the low-temperature plasma outlet pipeline 19 on the G1 / 2 threaded air outlet hole in the center of the front of the low-temperature plasma outlet end cover assembly 18. Thus, the assembly of the tube-type low-temperature plasma generator 32 is completed; (5) Use the extended through-threaded screw nut 36 to fasten and connect the four installation holes of the cooling fan 35 corresponding to four of the installation holes of the low-temperature plasma outlet end cover assembly 18. The power supply wires of the cooling fan 35 are respectively electrically connected to the DC+ and DC- of the DC output terminals of the 220V to 24V switching power supply 1; (6) Use the power connection wire 2 with an aviation plug, the high-voltage negative wire 23, and the high-voltage positive wire 24. As Figure 1 shown, the high-voltage positive wire 24 of the tube-type low-temperature plasma generator 32 is connected to the DC+ output terminal of the nanosecond-level DC high-frequency high-voltage power supply host 3, and the high-voltage negative wire 23 of the tube-type low-temperature plasma generator 32 is connected to the DC- output terminal of the nanosecond-level DC high-frequency high-voltage power supply host 3. The input terminal of the nanosecond-level DC high-frequency high-voltage power supply host 3 is electrically connected to the DC+ and DC- of the 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 live wire and neutral wire of the mains. Thus, the assembly of the modular tube-type low-temperature plasma generator is completed.

[0048] In the embodiment of the present application, after the combined on - market power control switch is turned on and the power supply is connected, the entire generator is in a working state. As Figure 1 shown, the compressed air 20 introduced through the connecting pipeline 6 of the compressed air inlet enters the inner cavity of the tubular low - temperature plasma generator 32. In the inner cavity channel of the generator, the air is excited and ionized by the applied DC high - frequency high - voltage electric field to generate low - temperature plasma 21. The generated low - temperature plasma 21 is discharged from the inner cavity channel through the low - temperature plasma outlet pipeline 19 under the action of gas pressure. The discharged low - temperature plasma is coupled and applied to the actual scenario through other technical equipment such as a micro - nano bubble generator, a jet aerator, a Venturi mixer, or a micron - level titanium alloy aeration disk. The modular tubular low - temperature plasma generator in the present application can be combined and arranged to manufacture low - temperature plasma high - end equipment of different specifications and models, which is mainly used in multiple different fields such as the ecological environment governance field, the saline - alkali land governance field, the agricultural planting field, the livestock breeding and aquaculture field, etc.

[0049] In the embodiment of the present application, from the effects and test results produced by the small - scale experiment and pilot - scale project low - temperature plasma high - end equipment that have been successfully manufactured and put into actual application, the modular tubular low - temperature plasma generator and low - temperature plasma high - end equipment proposed in this embodiment have very significant effects on the reduction, harmlessness, and beneficial resource utilization of municipal biochemical surplus sludge in the ecological environment governance field. The maximum sludge reduction rate in the small - scale experiment can reach 97%, and the average sludge reduction rate of the pilot - scale project low - temperature plasma high - end equipment reaches 90%. The removal rate of organic matter in the sludge reaches more than 99% on average, almost all bacteria and viruses in the sludge are killed, and 99% of the sludge odor is removed. Compared with ozone advanced oxidation, the present application has very obvious effects on the removal of pollutants such as organic matter, ammonia nitrogen, and total cyanide in municipal sewage and industrial wastewater, can significantly reduce its treatment cost, and increase social and economic benefits. Among them, the removal rate of organic matter is 90 - 100% (the removal rate of organic matter by ozone advanced oxidation is 60 - 80%), the average removal rate of ammonia nitrogen reaches 90 - 100% (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 pilot - scale project low - temperature plasma high - end equipment in this embodiment is only 1 / 15 of that of the ozone advanced oxidation equipment, which greatly reduces the energy consumption cost and at the same time significantly improves the treatment efficiency. More actual application scenarios are being continuously developed.

[0050] In the embodiment of the present application, compared with the traditional tubular ozone generator and the new plate - type ozone generator on the current market, the modular tubular low - temperature plasma generator of the present application has the following three major advantages and characteristics: , The ionized gas generated by the tubular low-temperature plasma generator 32 in this application contains a variety of mixed plasmas such as free electrons, high-energy ions, active free radicals, and nascent oxygen. In contrast, the ozone generator only generates a single gaseous molecule - ozone. Therefore, the low-temperature plasma has a higher electron volt energy density and a stronger redox potential. , 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 processes, 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 facility, and the required supporting equipment and facilities are relatively simple. Its modular design makes maintenance more convenient, and the operating cost is also relatively low. , When treating pollutants such as organic matter in wastewater, the removal rate of the ozone generator 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%. In summary, the value and significance demonstrated by this application in the field of ecological environment governance are extremely significant. It not only provides new ideas and methods for current environmental protection work, but also with the continuous progress and innovation of technology, more application scenarios are being continuously developed and expanded in order to achieve a more comprehensive and in-depth ecological environment governance effect.

[0051] Example Two This example proposes a modular tubular low-temperature plasma generator, and the only difference from Example One is that the outer contour diameter of the concentric circle connecting bracket 12 is 1.75 - 2.87 times the outer contour diameter of the micro-needle sheet 16, and specifically preferably, the outer contour diameter of the concentric circle connecting bracket 12 is 2.29 times the outer contour diameter of the micro-needle sheet 16.

[0052] Example Three As Figure 1 , Figure 2 , Figure 17 , Figure 18 , Figure 20 and Figure 21 shown, this example proposes a modular tubular low-temperature plasma generator, and the only difference from Example One and Example Two is that the micro-needle sheet 16 is a solid micro-needle sheet, and 6 micro-needle sheets 16, 5 metal spacer sleeves 15, and 1 anti-loosening nut 34 are provided in the micro-needle group.

[0053] Example Four This embodiment provides a modular tubular low-temperature plasma generator, which is only different from Embodiment 1, Embodiment 2, and Embodiment 3 in that the outer contour diameter of the micro-needle sheet 16 is preferably 36.5 mm, the thickness of the micro-needle sheet 16 is preferably 0.4 mm, the micro-needle length is preferably 3.0 mm, the number of needles of the micro-needle sheet 16 is preferably 90, the micro-needle diameter is preferably 100 microns, the distance between adjacent micro-needle tips is preferably 1.27 mm, and the diameter of the central axis hole of the micro-needle sheet 16 is preferably 2.85 mm.

[0054] Embodiment 5 This embodiment provides a modular tubular low-temperature plasma generator, which is only different from Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4 in that the thickness of the insulating dielectric coating inside the metal dielectric sleeve negative electrode 22 is preferably 0.5 mm.

[0055] Embodiment 6 This embodiment provides a modular tubular low-temperature plasma generator, which further defines, on the basis of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, or Embodiment 5, that the Ϙ-shaped metal ring 25 welded to one end of the high-voltage negative wire 23 is made of the same material as the metal dielectric sleeve negative electrode 22.

[0056] Embodiment 7 This embodiment provides a modular tubular low-temperature plasma generator, which is only different from Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, and Embodiment 6 in that the working electric field voltage in the cavity of the metal dielectric sleeve negative electrode 22 is 22 KV of direct current high voltage.

[0057] Embodiment 8 This embodiment provides a modular tubular low-temperature plasma generator, which is only different from Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, and Embodiment 7 in that the distance between the tip vertex of the micro-needle sheet 16 and the inner wall of the metal dielectric sleeve negative electrode 22 is preferably 22 mm.

[0058] Embodiment 9 This embodiment provides a modular tubular low-temperature plasma generator. The differences from Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, and Embodiment 8 are only as follows: The preferred material of the insulating tube 10 is a polytetrafluoroethylene tube. The axial length of the insulating tube 10 is preferably 150 mm, the inner diameter of the tube is 80 mm, the wall thickness of the tube is 3 mm, and the outer diameter of the tube is 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 is coaxial with the metal dielectric sleeve negative electrode 22, 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 in the lower-middle part of the inner cavity of the insulating tube 10.

[0059] Embodiment 10 This embodiment provides a modular tubular low-temperature plasma generator. The differences from Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, Embodiment 8, and Embodiment 9 are only as follows: The working pulse width of the nanosecond-level DC high-frequency high-voltage power supply host 3 is 200 - 400 ns, the high-frequency is 15 - 18 KHz, and the DC high-voltage is 20 - 25 KV.

[0060] Embodiment 11 This embodiment provides a modular tubular low-temperature plasma generator. The differences from Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, Embodiment 8, Embodiment 9, and Embodiment 10 are only as follows: The axial length of the metal dielectric sleeve negative electrode 22 is 75 mm, the inner diameter of the tube is 73.5 mm, the wall thickness of the tube is 3 mm, the outer diameter of the tube is 79.5 mm. The size of the Ϙ-shaped card slot 27 is preferably a cylindrical diameter of 3 mm and a height of 1.5 mm. The diameter of the Ϙ-shaped groove is 9 mm, the width of the groove is 3 mm, the depth of the groove is 1.5 mm. The length of the tail of the Ϙ-shaped groove is the length from the outer wall edge of the metal dielectric sleeve negative electrode 22 to the groove, and its length is 10 mm.

[0061] Embodiment 12 This embodiment provides a modular tubular low-temperature plasma generator. The differences from Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, Embodiment 8, Embodiment 9, Embodiment 10, and Embodiment 11 are only as follows: The tubular fin radiator 9 is preferably made of aluminum alloy. The cross-section of the tubular fin radiator 9 is preferably 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 fin 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 fin radiator 9 is 125.5 mm.

[0062] Example Thirteen This example presents a modular tubular low-temperature plasma generator. The differences from Example One, Example Two, Example Three, Example Four, Example Five, Example Six, Example Seven, Example Eight, Example Nine, Example Ten, Example Eleven, and Example Twelve are only as follows: The preferred material of the compressed air inlet end cover assembly 7 is made of polytetrafluoroethylene plate, with a total thickness of 20 mm, an outer diameter of the end cover of 125.5 mm. The end cover is provided with eight lug mounting hole plates, and the hole positions are aligned with the tubular fin radiator 9 with a cross-section having eight M6 internal thread mounting holes 33. The size of the perforations is 8 mm. A G1 / 2 threaded air inlet through-hole is provided at the exact center of the front of the end cover, with a thread depth of 20 mm. And a G1 / 2 threaded air inlet through-hole at the exact center of the front of the end cover is concentrically provided with an O-ring groove with a sinking depth of 1 mm and a diameter of 24 mm. The G1 / 2 threaded air inlet through-hole at the exact center of the front of the end cover is used to install the compressed air inlet pipeline 6. On both sides of the G1 / 2 threaded air inlet through-hole provided at the exact center of the front of the end cover, an M20 threaded through-hole is respectively provided, with a thread depth of 20 mm. The centers of the three holes are on the same center line, and the center distance between adjacent two holes is 28 mm. And an O-ring groove with a sinking depth of 1 mm and a diameter of 24 mm is concentrically provided for the two M20 threaded through-holes on the front of the end cover. The two M20 threaded through-holes on the front of the end cover are respectively used to install M20 type gland nuts made of 304 stainless steel. One M20 type gland nut made of 304 stainless steel is used for the high-voltage positive power supply wire to pass through the perforation and is locked and sealed to prevent air leakage. The other M20 type gland nut made of 304 stainless steel is used for the high-voltage negative power supply wire to pass through the perforation and is locked and sealed to prevent air leakage. The back of the end cover is processed into a protruding circular seal structure. The outer diameter of the circular seal is 86.5 mm, the total thickness of the end cover is 20 mm, and the height of the circular seal is 8 mm. The rest is thinned to a thickness of 12 mm.

[0063] Example Fourteen This embodiment provides a modular tubular low-temperature plasma generator. The difference between this embodiment and Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, Embodiment 8, Embodiment 9, Embodiment 10, Embodiment 11, Embodiment 12, Embodiment 13 is only that the preferred material of the low-temperature plasma outlet end cover assembly 18 is processed from a polytetrafluoroethylene plate. Its total thickness is 20 mm, the outer diameter of the end cover is 125.5 mm. The end cover is provided with eight lug mounting hole plates, and the hole positions are aligned with the tubular fin radiator 9 with eight M6 internal thread mounting holes 33 in the cross-section. The size of the perforation is 8 mm. A G1 / 2 threaded air outlet through-hole is provided at the exact center of the front surface of the end cover, with a thread depth of 20 mm. And a G1 / 2 threaded air outlet through-hole at the exact center of the front surface of the end cover is concentrically provided with an O-ring groove with a sinking depth of 1 mm and a diameter of 24 mm. The G1 / 2 threaded air outlet through-hole at the exact center of the front surface of the end cover is used to install the low-temperature plasma outlet pipeline 19. The back surface of the end cover is processed into a protruding circular seal structure. The outer diameter of the circular seal is 86.5 mm, the total thickness of the end cover is 20 mm, the height of the circular seal is 8 mm, and the rest is thinned to a thickness of 12 mm.

[0064] Embodiment 15 This embodiment provides a modular tubular low-temperature plasma generator. The difference between this embodiment and Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, Embodiment 6, Embodiment 7, Embodiment 8, Embodiment 9, Embodiment 10, Embodiment 11, Embodiment 12, Embodiment 13, and Embodiment 14 is only that the cooling fan 35 is preferably powered by DC24V, the maximum rotation speed of the fan is 7500 revolutions per minute. 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 the lengthened through-threaded screw nuts 36.

[0065] In the description of the present application, the description referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples" means that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0066] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A modular tubular low-temperature plasma generator, characterized in that, It includes a nanosecond-level DC high-frequency high-voltage power supply host, a high-voltage positive electrode of a micro-needle group, a high-voltage positive wire, a metal-dielectric sleeve negative electrode, a high-voltage negative wire, an isolation sleeve, a concentric-circle connection bracket, an insulating tube, a tube-type fin radiator, a compressed-air inlet end cover assembly, and a low-temperature plasma outlet end cover assembly. A cylindrical pin is provided at the top of the high-voltage positive electrode of the micro-needle group. One end of the high-voltage positive wire is connected to the positive high-voltage output port of the nanosecond-level DC high-frequency high-voltage power supply host. A nut post is provided at the other end of the high-voltage positive wire. The two ends of the isolation sleeve are respectively fixedly connected to the cylindrical pin and the bottom end of the nut post. The top end of the nut post is fixedly connected to the central area at the bottom end of the concentric-circle connection bracket. The high-voltage negative wire is connected to the metal-dielectric sleeve negative electrode for connecting to the negative high-voltage output port of the nanosecond-level DC high-frequency high-voltage power supply host. The metal-dielectric sleeve negative electrode is sleeved outside the high-voltage positive electrode of the micro-needle group and adhesively fixed to the inner wall of the insulating tube. The outer edge at the bottom end of the concentric-circle connection bracket is adhesively fixed to the top end of the insulating tube to form a low-temperature plasma generator. The tube-type fin radiator is sleeved outside the low-temperature plasma generator, and the top and bottom ends of the tube-type fin radiator are respectively fixedly sealed to the compressed-air inlet end cover assembly and the low-temperature plasma outlet end cover assembly.

2. The modular tube-type low-temperature plasma generator according to claim 1, wherein The pulse width of the nanosecond-level DC high-frequency high-voltage power supply host is 100 - 600 ns, the input voltage is DC 24 - 30 V, the output voltage is DC 18 - 100 KV, and the frequency is 15 - 50 KHz.

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

4. The modular tubular low-temperature plasma generator according to claim 1, wherein The high-voltage positive electrode of the micro-needle group includes a plurality of micro-needle pieces, a plurality of metal spacer sleeves, a plum blossom screw rod, and a locknut. Each of the micro-needle pieces is stacked along the axial direction of the isolation sleeve. A metal spacer sleeve is respectively provided between every two adjacent micro-needle pieces. The plum blossom screw rod sequentially passes through each of the micro-needle pieces and each of the metal spacer sleeves and cooperates with the locknut, and is fixedly connected to the cylindrical pin.

5. The modular tubular low-temperature plasma generator according to claim 4, wherein, Each of the micro-needle pieces is a middle-hollow micro-needle piece or a solid micro-needle piece.

6. The modular tubular low-temperature plasma generator according to claim 1, characterized in that, The concentric circle connection bracket includes an outer adhesive fixed ring, a concentric center ring, and a plurality of connection brackets. The diameter of the concentric center ring is smaller than that of the outer adhesive fixed ring. One end of each connection bracket is connected to the inner peripheral wall of the outer adhesive fixed ring, and the other end of each connection bracket is connected to the outer peripheral wall of the concentric center ring.

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

8. The modular tube-type low-temperature plasma generator according to claim 1, wherein, One end of the high-voltage negative wire is provided with a Ϙ-shaped metal ring. A Ϙ-shaped card slot is formed on the outer wall of the negative electrode of the metal dielectric sleeve for installing the Ϙ-shaped metal ring.

9. The modular tubular low-temperature plasma generator according to claim 1, wherein A dielectric coating is provided on the inner wall of the negative electrode of the metal dielectric sleeve.

10. The modular tubular low-temperature plasma generator according to claim 1, characterized in that, It further includes a cooling fan. The cooling fan is installed below the low-temperature plasma outlet end cover assembly and is fixedly connected to the low-temperature plasma outlet end cover assembly through a lengthened through-threaded screw nut.

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