A high-voltage connection device for nanosecond pulsed discharge plasma

Abstract

This invention discloses a high-voltage connection device for nanosecond pulsed discharge plasma, comprising a circular ring fixing component, an insulating body, a fastening nut, a conductive rod, a hollow plug, and a sealing gasket. The outer surface of the circular ring fixing component is rounded and has no sharp corners; the insulating body has a through hole, with an oil groove, an annular groove, and an air groove connected at both ends; the main body column passes through the circular ring fixing component and is fastened by the nut; the conductive rod passes through the through hole; the hollow plug is threaded to the annular groove, providing axial thrust when screwed in to compress the sealing gasket, causing it to deform and fill the gap between the conductive rod and the annular groove to form a seal. This invention achieves reliable sealing and leak-proof protection at the oil tank outlet by compressing the sealing gasket; the absence of sharp corners and the connected grooves effectively suppress high-voltage electric field distortion and surface discharge; and the entire assembly is detachable, facilitating rapid reactor maintenance.

Description

Technical Field

[0001] This invention belongs to the field of electrical connection technology, and specifically relates to a high-voltage connection device for nanosecond pulsed discharge plasma. Background Technology

[0002] Gas discharge is a common method for generating plasma. Atmospheric pressure discharge plasma has wide applications in materials processing, biomedicine, environmental science, food processing, and many other fields. Industrial nanosecond pulsed atmospheric pressure plasma power supplies and plasma reactors require reliable electrical connections; this connection technology directly affects whether air plasma can be stably generated and whether it can be used on a large scale in industrial production.

[0003] High-voltage nanosecond pulse power supplies are characterized by fast rise time, high peak voltage, high instantaneous power, and low thermal effect, making them ideal for plasma generation. To meet the requirements of high-power heat dissipation and high-voltage insulation, high-power nanosecond pulse power supplies generally adopt an oil-immersed structure. The high-voltage power devices are immersed inside an insulating oil tank, and the high-voltage output terminal needs to be led out from the side wall of the oil tank and connected to the high-voltage electrode inside the plasma reactor.

[0004] Industrial nanosecond pulsed atmospheric pressure plasma power supplies are characterized by high power, high voltage, and short pulse duration, with extremely high power per pulse. Only a reliable connection between the power supply and the reactor can ensure the reliable and efficient transfer of pulse energy to the reactor, generating atmospheric pressure air discharge plasma. Taking a certain industrial nanosecond pulsed atmospheric pressure plasma power supply as an example, it generates pulse voltages as high as 150KV, single-pulse energy of 5J, and a pulse width of 100ns. Its high-voltage pulse shaping section is placed in insulating oil, and the high-voltage pulse output line needs to be led out from the side wall of the insulating oil tank and connected to the plasma reactor. This connection device must ensure that no discharge occurs on the output line; simultaneously, when maintaining the plasma reactor, the connection between the reactor and the high-voltage pulse source needs to be disconnected.

[0005] However, in existing technologies, the high-pressure outlet of the oil tank mostly uses ordinary high-pressure porcelain insulators or simple flange sealing structures, and is directly connected to the reactor using rigid copper busbars or high-pressure cables, which has the following serious drawbacks: 1. The high-voltage lead-out end of the oil tank has poor sealing performance. The transient high-voltage electric field of the nanosecond pulse can easily cause the sealing ring to age and fail, resulting in leakage of insulating oil. Conventional insulation components cannot be adapted to the nanosecond steep leading edge pulse. The electric field is severely concentrated, and the lead-out end and connection parts are very prone to creepage, surface discharge or even insulation breakdown. 2. The overall structure is not detachable. When replacing the reactor electrodes or cleaning and maintaining the chamber, it is necessary to disassemble the high-voltage components of the power supply tank, which is cumbersome and has low safety. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a high-voltage connection device for nanosecond pulsed discharge plasma.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: A high-voltage connection device for nanosecond pulsed discharge plasma includes a circular ring fastener, an insulating body, a fastening nut, a conductive rod, a hollow plug, and a sealing gasket. The circular ring fastener and the conductive rod are both made of good electrical conductors, while the insulating body, the fastening nut, the hollow plug, and the sealing gasket are all made of electrical insulators. The ring fastener is a ring with no sharp corners on its outer surface and rounded corners at each corner, used for sealing welding of the opening of the oil tank of the oil-immersed nanosecond pulse power supply. The insulating body includes a main column, the main column having a through hole at its axis, a flange and an oil groove at its first end, a convex ring surrounding the through hole in the oil groove, and an annular groove surrounding the through hole in the convex ring; an air groove at the second end of the main column, the through hole, oil groove, annular groove and air groove being interconnected; and an external thread A on the outer circumference of the main column. The main body column of the insulating body passes through the ring fixing member, the fastening nut is screwed to the external thread A on the main body column, and the ring fixing member is clamped between the flange and the fastening nut; the oil groove is used to allow the insulating oil in the oil tank to be immersed, and the air groove is used to communicate with the outside air; The conductive rod passes through the through hole, with its two ends located in the oil tank and air tank, respectively, and is used to electrically connect to the oil-immersed nanosecond pulse power supply and the plasma reactor, respectively. The hollow plug is threaded to the inner wall of the annular groove; the sealing gasket is sleeved on the outer circumference of the conductive rod and located between the hollow plug and the bottom of the annular groove. By screwing the hollow plug in, an axial thrust is provided to squeeze the sealing gasket, causing the sealing gasket to deform and fill the space between the conductive rod and the inner wall of the annular groove to form a seal.

[0008] Furthermore, the outer surface roughness of the ring fastener is no greater than 1.6μm; the connection between the flange and the main body column is provided with a sealing and fitting rounded corner, which fits with the rounded corner on the ring fastener, and the fitting area is provided with insulating sealant.

[0009] Furthermore, an adjusting shim is provided between the hollow plug and the sealing gasket, and the adjusting shim is an electrical insulator.

[0010] Furthermore, the fastening nut is provided with a protective groove for accommodating the portion of the annular fastener that protrudes beyond the oil tank.

[0011] Furthermore, the air slot is in the shape of a flared mouth with a gradually widening opening.

[0012] Furthermore, the taper of the air trough is 15°-18°.

[0013] Furthermore, it also includes inner and outer conductors, both of which are made of multi-strand enameled wire wound together and wrapped with an insulating protective sleeve. The conductive rod has drilled holes at both ends, and the inner and outer conductors are respectively inserted into the drilled holes and soldered to the conductive rod. The inner conductor is used to electrically connect with the pulse high-voltage output capacitor of the oil-immersed nanosecond pulse power supply, and the outer conductor is used to electrically connect with the plasma reactor.

[0014] Furthermore, the inner conductor is electrically connected to the pulse high-voltage output capacitor via a high-voltage terminal, the inner conductor is soldered to the high-voltage terminal, and the high-voltage terminal is rigidly fixed to the pulse high-voltage output capacitor.

[0015] Furthermore, the external conductor is electrically connected to the plasma reactor via external terminals and external connectors. Both external terminals and external connectors are made of good electrical conductors, and the external conductor is fixedly connected to the external terminals. The external terminal includes an inner core and a locking nut. The inner core includes a core tube, one end of which is fixedly connected to the plasma reactor. The other end of the core tube has multiple expansion joints along the circumferential direction, and fastening flaps are formed between adjacent expansion joints. The locking nut is sleeved on the outside of the inner core and threadedly connected to the inner core. Rotating the locking nut in the forward direction drives it to compress the multiple fastening flaps to move closer to each other and contract. The external terminal extends into the fastening flap, and the external terminal is clamped and fixed by the contraction of the fastening flap.

[0016] Furthermore, the core tube has an externally inclined end face at one end with an expansion joint, and an externally threaded protruding ring on the outer periphery of the core tube; the inner hole of the locking nut includes a threaded hole, a central hole, and an inlet hole in sequence, with the inner diameters of the three decreasing sequentially, and an internally inclined end face between the central hole and the inlet hole; the threaded hole is screwed to the externally threaded protruding ring, and the internally inclined end face and the externally inclined end face form a wedge fit, driving the fastening flap to contract; the external terminal extends into the fastening flap through the inlet hole.

[0017] The beneficial effects that this invention can achieve are as follows: 1. This invention adopts a detachable connection method combining an insulating body, a fastening nut, and a conductive rod, which facilitates the transportation, movement, adjustment, and rapid maintenance of the oil-immersed nanosecond pulse power supply and the plasma reactor, and completely avoids the risk of disassembling the high-voltage components of the power supply tank when maintaining the reactor.

[0018] 2. The present invention features a ring-shaped fixing component with no sharp corners on its outer surface and rounded corners at each corner, which avoids the right angle and sharp point effects at the opening of the thin wall of the oil tank, significantly reduces the local electric field concentration, and effectively suppresses arcing under high voltage. At the same time, the air groove is designed as a flared mouth with a specific taper, which increases the creepage distance of the electric arc and makes the distance between the conductor and the oil tank wall gradually increase, and the electric field strength decreases with distance, which greatly improves the surface insulation strength.

[0019] 3. The present invention provides axial thrust through the hollow plug and the threaded connection of the ring groove, which squeezes the sealing gasket to deform and fill between the conductive rod and the inner wall of the ring groove, thus achieving reliable radial and axial sealing and effectively preventing the leakage of insulating oil and the intrusion of external air; the oil tank is immersed in insulating oil, which not only facilitates heat dissipation, but the flowing insulating oil also has an excellent arc extinguishing effect.

[0020] 4. The conductor of the present invention adopts a multi-strand enameled wire winding structure, which effectively reduces the skin effect caused by nanosecond high-frequency pulse current, and prevents local overheating and additional electric field distortion. After drilling holes, the conductor and the conductive rod are soldered together, which squeezes out the air at the connection and forms a dense and gapless whole, cutting off the corona discharge inducing factors from the root and ensuring that the pulse waveform is not distorted.

[0021] 5. The external wiring terminal of this invention adopts a wedge-shaped locking structure, which can quickly clamp or loosen the external wiring post by simply rotating the locking nut, realizing quick plug-in connection between the power supply and the reactor; the internal wire is rigidly fixed to the capacitor through the high-voltage wiring terminal, which completely isolates the mechanical pulling force from the fragile capacitor and improves the reliability of the system. Attached Figure Description

[0022] Figure 1 This is an application diagram of an embodiment of the present invention.

[0023] Figure 2 This is a perspective view of an embodiment of the present invention.

[0024] Figure 3 This is the front view of an embodiment of the present invention.

[0025] Figure 4 yes Figure 3 AA sectional view.

[0026] Figure 5 yes Figure 4 A magnified view of section B.

[0027] Figure 6 This is a perspective view of the external wiring terminals in an embodiment of the present invention.

[0028] Figure 7 This is a perspective view of the inner core of the external wiring terminal in an embodiment of the present invention.

[0029] Figure 8 This is a front sectional view of the locking nut of the external wiring terminal in an embodiment of the present invention.

[0030] In the diagram: 1-Insulating body, 101-Flanged edge, 102-Raised ring, 103-Ring groove, 104-Oil groove, 105-Through hole, 106-Air groove, 107-Body post, 108-External thread A; 2-Fasting nut, 201-Guard groove; 3-Inner conductor, 4-High voltage terminal, 5-Ring fixing piece, 6-Outer conductor, 7-Outer terminal, 8-Hollow plug, 9-Conductive rod, 10-Sealing gasket. 11-Adjusting shim, 12-Oil tank, 13-Base, 14-Plasma reactor, 15-External terminal, 151-Inner core, 1511-Core tube, 1512-External threaded protrusion ring, 1513-Expansion joint, 1514-Outer beveled end face, 1515-Fasting flap; 152-Locking nut, 1521-Threaded hole, 1522-Center hole, 1523-Inlet hole, 1524-Inner beveled end face. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] The nanosecond pulsed discharge plasma system includes an oil-immersed nanosecond pulsed power supply and a plasma reactor 14. The oil-immersed nanosecond pulsed power supply includes an oil tank 12 and a pulsed high-voltage output capacitor located inside the oil tank 12. This embodiment provides a device for achieving a high-voltage electrical connection between the pulsed high-voltage output capacitor and the plasma reactor 14, such as... Figure 1 As shown. In use, the oil tank 12 and the plasma reactor 14 are fixed together on the base 13 to form a unified ground, eliminating floating potential.

[0033] A high-voltage connection device for nanosecond pulsed discharge plasma, such as Figures 2-5 As shown, the assembly includes a circular fixing component 5, an insulating body 1, a fastening nut 2, a conductive rod 9, a hollow plug 8, a sealing gasket 10, an inner conductor 3, an outer conductor 6, an outer terminal block 7, and an outer terminal block 15. The circular fixing component 5, the conductive rod 9, the outer terminal block 7, and the outer terminal block 15 are all made of good electrical conductors, while the insulating body 1, the fastening nut 2, the hollow plug 8, and the sealing gasket 10 are all made of electrical insulators. The inner conductor 3 and the outer conductor 6 are both made of multi-strand enameled wire wound together and are externally wrapped with an insulating protective sleeve.

[0034] The circular fixing component 5 is a ring with no sharp corners on its outer surface and rounded corners at each turn. Its outer surface roughness is no greater than 1.6μm. It is used for sealing the opening of the oil tank 12, which is adapted to an oil-immersed nanosecond pulse power supply. During installation, the circular fixing component 5 is fully welded to the wall of the oil tank 12 to form a sealed weld. Because the side wall of the oil tank 12 is relatively thin, under high voltages such as 150KV and nanosecond pulses, discharge reactions are very likely to occur at the opening. The circular fixing component 5, with its smooth outer surface and rounded corners at each turn, can effectively avoid the sharp point effect and reduce the degree of local electric field concentration.

[0035] The insulating body 1 includes a main body post 107. The main body post 107 has a through hole 105 at its axis. The first end of the main body post 107 has a flange 101 and an oil groove 104. A convex ring 102 is provided around the through hole 105 in the oil groove 104. An annular groove 103 is provided around the through hole 105 in the convex ring 102. The second end of the main body post 107 has an air groove 106. The through hole 105, oil groove 104, annular groove 103 and air groove 106 are all connected. The outer circumference of the main body post 107 has an external thread A108.

[0036] The main body column 107 of the insulating body 1 passes through the annular fixing member 5. The fastening nut 2 is screwed to the external thread A108 on the main body column 107. The annular fixing member 5 is clamped between the flange 101 and the fastening nut 2. The connection between the flange 101 and the main body column 107 is provided with a sealing and fitting rounded corner, which fits with the rounded corner on the annular fixing member 5, and the fitting area is coated with insulating sealant. The fastening nut 2 is provided with a protective groove 201, which is used to accommodate the part of the annular fixing member 5 that protrudes outside the oil tank 12. The oil tank 104 is immersed in the insulating oil in the oil tank 12, and the air tank 106 is used to communicate with the outside air. The air tank 106 is a flared shape with a gradually widening opening and a taper of 15°-18°. This structure increases the creepage distance of the electric arc, and as the distance between the conductor and the oil tank wall increases, the electric field strength gradually decreases, effectively preventing the generation of electric arc.

[0037] The conductive rod 9 includes an inner end and an outer end. After passing through the through hole 105, the inner end and the outer end are located in the oil tank 104 and the air tank 106, respectively. The inner end is used to electrically connect to the pulse high voltage output capacitor of the oil-immersed nanosecond pulse power supply through the inner wire 3, and the outer end is used to electrically connect to the plasma reactor 14 through the outer wire 6.

[0038] The conductive rod 9 is sealed to the annular groove 103 via a hollow plug 8 and a sealing gasket 10. Specifically, the outer circumference of the hollow plug 8 is provided with an external thread B, which is threaded to the inner wall of the annular groove 103 of the insulating body 1. Figure 5As shown, a sealing gasket 10 is fitted around the outer periphery of the conductive rod 9. The sealing gasket 10 is located between the hollow plug 8 and the bottom of the annular groove 103. By screwing the hollow plug 8 in, an axial thrust is provided to compress the sealing gasket 10, causing it to deform and tightly fill the space between the conductive rod 9 and the inner wall of the annular groove 103, thus achieving a reliable seal. An adjusting shim 11 is also provided between the hollow plug 8 and the sealing gasket 10 to adjust the preload and protect the sealing gasket.

[0039] Both the inner conductor 3 and the outer conductor 6 use multi-strand enameled wire to reduce the skin effect caused by nanosecond high-frequency current; in this embodiment, the diameter of each enameled wire is 0.1mm, and 1000 strands are used.

[0040] The selection principle of inner conductor 3 and outer conductor 6: (1) Considering current carrying capacity: Instantaneous nanosecond pulse current requires sufficient total cross-sectional area of ​​the conductor, otherwise the conductor will melt due to overheating. The minimum number of strands corresponds to the minimum total cross-sectional area Amin to ensure that it can withstand pulse current.

[0041] (2) Considering welding reliability: Too many strands may lead to an excessively large total cross-sectional area and an increased overall outer diameter, making it difficult to ensure that all strands are firmly welded during welding. The maximum number of strands corresponds to the maximum total cross-sectional area Amax to avoid welding problems.

[0042] Combining the above two principles, for a single-strand enameled wire of any diameter d (unit: mm), the minimum number of strands Nmin and the maximum number of strands Nmax can be calculated by the following formulas: .

[0043] The connection structure between the conductive rod 9 and the inner wire 3 and the outer wire 6 is as follows: holes are drilled at both ends of the conductive rod 9, and the inner wire 3 and the outer wire 6 are respectively inserted into the drilled holes and then soldered. The molten solder displaces the air, forming a dense and gapless whole, eliminating the cause of corona discharge and reducing parasitic inductance.

[0044] One end of the inner conductor 3 is soldered to the inner end of the conductive rod 9, and the other end is soldered to the high-voltage terminal 4 (in this embodiment, the high-voltage terminal 4 is a commonly used OT-type cold-pressed terminal in the power industry, specifically OT-100A), so that the multi-strand enameled wire and the terminal 4 are integrated, eliminating contact gaps; the high-voltage terminal 4 is rigidly fastened to the pulse high-voltage output capacitor by bolts. The high-voltage terminal 4 bears and disperses the tensile force and vibration transmitted from the inner conductor 3, thereby completely isolating the mechanical stress from the fragile pulse high-voltage output capacitor and protecting the pulse high-voltage output capacitor. The inner conductor 3 is immersed in the insulating oil in the oil tank 12. The flowing insulating oil facilitates heat dissipation and has an arc-extinguishing effect.

[0045] One end of the external conductor 6 is soldered to the outer end of the conductive rod 9, and the other end is electrically connected to the plasma reactor 14 via the external terminal 7 and the external terminal block 15. Specifically, the external conductor 6 and the external terminal 7 are fixedly connected by soldering. The external terminal block 15 includes an inner core 151 and a locking nut 152, as shown below. Figures 6-8 As shown. The inner core 151 includes a core tube 1511, one end of which is fixedly connected to the plasma reactor 14. The other end of the core tube 1511 has a cantilever section with multiple expansion joints 1513 along the circumferential direction, and a fastening flap 1515 is formed between adjacent expansion joints 1513. The cantilever section of the core tube 1511 has an outer beveled end face 1514, and the outer circumference of the core tube 1511 has an externally threaded protruding ring 1512. A locking nut 152 is sleeved on the outside of the inner core 151. The inner hole of the locking nut 152 includes a threaded hole 1521, a central hole 1522, and an inlet hole 1523, with the inner diameters of the three decreasing sequentially. An inner beveled end face 1524 is provided between the central hole 1522 and the inlet hole 1523. The threaded hole 1521 is screwed to the externally threaded protruding ring 1512, and the inner beveled end face 1524 and the outer beveled end face 1514 form a wedge-shaped connection. The external terminal 7 extends through the inlet hole 1523 into the fastening flap 1515. Rotating the locking nut 152 in the forward direction causes the inner beveled end face to press against the outer beveled end face, driving the multiple fastening flaps 1515 to move closer together and contract, firmly clamping the external terminal 7. Rotating the locking nut 152 in the reverse direction causes the fastening flaps 1515 to return to their original position and open, releasing the external terminal 7, thereby achieving a quick plug-in connection and effectively reducing the probability of flashover.

[0046] The working and operating principles of this invention are as follows: During installation, firstly, the round ring fastener 5, with no sharp corners, is fully welded to the opening on the side wall of the oil tank 12 to seal it, avoiding right-angled sharp points on the oil tank wall. Then, the main body column 107 of the insulating body 1 is passed through the round ring fastener 5, and the fastening nut 2 is tightened to clamp and fix the flange 101 to the round ring fastener 5. Insulating sealant is then applied to the rounded corners to prevent external leakage. The inner conductor 3 is soldered to the inner end of the conductive rod 9 and placed in the oil trough 104. The other end is rigidly connected to the capacitor through the high-voltage terminal 4. The outer end of the conductive rod 9 is soldered to the outer conductor 6. Then, the sealing gasket 10 is fitted into the ring groove 103, and the hollow plug 8 is screwed in. The axial thrust provided by the thread compresses the sealing gasket 10, causing it to expand and deform radially, tightly filling the gap between the conductive rod 9 and the inner wall of the ring groove, achieving reliable insulation and sealing between the oil side and the air side. When making an external connection, the inner core 151 is welded and fixed to the discharge electrode on the plasma reactor 14. The external terminal 7 (which has been welded to the external conductor 6) passes through the inlet hole 1523 of the locking nut 152 and extends to the fastening flap 1515. The locking nut 152 is rotated in the forward direction, and its inner inclined end face 1524 and the outer inclined end face 1514 of the inner core are wedge-shaped to drive the fastening flap 1515 to contract, firmly clamping the external terminal 7 to achieve electrical connection.

[0047] When the equipment is running, the oil tank 104 is immersed in insulating oil to achieve efficient heat dissipation and arc extinguishing. The flared structure of the air tank 106 increases the creepage distance and reduces the electric field strength, suppressing surface discharge. The soldered structure of the multi-strand enameled wire and the conductive rod displaces air, cuts off the corona induction and reduces parasitic inductance.

[0048] When reactor 14 needs maintenance, simply rotate the locking nut 152 in the opposite direction to open the locking flap 1515 back to its original position, and the external terminal 7 can be pulled out without disassembling the high-voltage components of the power supply tank, achieving safe and quick separation.

[0049] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the concept of the present invention should be considered to fall within the scope of protection of the present invention.

Claims

1. A high-voltage connection device for nanosecond pulsed discharge plasma, characterized in that, It includes a ring fastener (5), an insulating body (1), a fastening nut (2), a conductive rod (9), a hollow plug (8), and a sealing gasket (10). The ring fastener (5) and the conductive rod (9) are both good conductors of electricity, and the insulating body (1), the fastening nut (2), the hollow plug (8), and the sealing gasket (10) are all electrical insulators. The ring fastener (5) is a ring with no sharp corners on its outer surface and rounded corners at each corner, used for sealing welding of the opening of the oil tank (12) of the oil-immersed nanosecond pulse power supply. The insulating body (1) includes a main body column (107), the main body column (107) has a through hole (105) at its axis, the first end of the main body column (107) has a flange (101) and an oil groove (104), the oil groove (104) has a convex ring (102) surrounding the through hole (105), the convex ring (102) has an annular groove (103) surrounding the through hole (105); the second end of the main body column (107) has an air groove (106), the through hole (105), the oil groove (104), the annular groove (103) and the air groove (106) are all connected; the outer circumference of the main body column (107) has an external thread A (108). The main body column (107) of the insulating body (1) passes through the ring fixing member (5), the fastening nut (2) is screwed to the external thread A (108) on the main body column (107), and the ring fixing member (5) is clamped between the flange (101) and the fastening nut (2); the oil groove (104) is used to allow the insulating oil in the oil tank (12) to be immersed, and the air groove (106) is used to communicate with the outside air; The conductive rod (9) passes through the through hole (105), and the two ends of the conductive rod (9) are located in the oil tank (104) and the air tank (106) respectively, and are used to electrically connect with the oil-immersed nanosecond pulse power supply and the plasma reactor (14) respectively. The hollow plug (8) is threaded to the inner wall of the annular groove (103); the sealing gasket (10) is sleeved on the outer periphery of the conductive rod (9) and located between the hollow plug (8) and the bottom of the annular groove (103). By screwing in the hollow plug (8), an axial thrust is provided to squeeze the sealing gasket (10), so that the sealing gasket (10) is deformed and filled between the conductive rod (9) and the inner wall of the annular groove (103) to form a seal.

2. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 1, characterized in that: The outer surface roughness of the ring fastener (5) is no greater than 1.6μm; the connection between the flange (101) and the main body column (107) is provided with a sealing and fitting rounded corner, which fits with the rounded corner on the ring fastener (5), and the fitting area is provided with insulating sealant.

3. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 1, characterized in that: An adjusting shim (11) is provided between the hollow plug (8) and the sealing gasket (10), and the adjusting shim (11) is an electrical insulator.

4. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 1, characterized in that: The fastening nut (2) is provided with a groove (201) for accommodating the portion of the annular fastener (5) that protrudes beyond the oil tank (12).

5. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 1, characterized in that: The air slot (106) has a funnel shape with a gradually widening opening.

6. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 5, characterized in that: The taper of the air trough (106) is 15°-18°.

7. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 1, characterized in that: It also includes an inner conductor (3) and an outer conductor (6), both of which are made of multi-strand enameled wire and are wrapped with an insulating protective sleeve. The conductive rod (9) has drilled holes at both ends, and the inner conductor (3) and the outer conductor (6) are respectively inserted into the drilled holes and soldered to the conductive rod (9). The inner conductor (3) is used to electrically connect with the pulse high voltage output capacitor of the oil-immersed nanosecond pulse power supply, and the outer conductor (6) is used to electrically connect with the plasma reactor (14).

8. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 7, characterized in that: The inner conductor (3) is electrically connected to the pulse high voltage output capacitor through the high voltage terminal (4). The inner conductor (3) is soldered to the high voltage terminal (4). The high voltage terminal (4) is rigidly fixed to the pulse high voltage output capacitor.

9. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 7, characterized in that: The external conductor (6) is electrically connected to the plasma reactor (14) through the external terminal (7) and the external terminal (15). The external terminal (7) and the external terminal (15) are both good conductors of electricity. The external conductor (6) is fixedly connected to the external terminal (7). The external terminal (15) includes an inner core (151) and a locking nut (152). The inner core (151) includes a core tube (1511). One end of the core tube (1511) is used to be fixedly connected to the plasma reactor (14). The other end of the core tube (1511) has multiple expansion joints (1513) along the circumferential direction. A fastening flap (1515) is formed between adjacent expansion joints (1513). The locking nut (152) is sleeved on the outside of the inner core (151) and threadedly connected to the inner core (151). Rotating the locking nut (152) in the forward direction drives it to compress the multiple fastening flaps (1515) to move closer to each other and contract. The external terminal (7) extends into the fastening flap (1515) and is clamped and fixed by the contraction of the fastening flap (1515).

10. The high-voltage connection device for nanosecond pulsed discharge plasma according to claim 9, characterized in that: The core tube (1511) has an expansion joint (1513) at one end with an external beveled end face (1514), and the outer periphery of the core tube (1511) has an external threaded protrusion ring (1512); the inner hole of the locking nut (152) includes a threaded hole (1521), a central hole (1522) and an inlet hole (1523) in sequence, with the inner diameter of the three decreasing in sequence, and an internal beveled end face (1524) is provided between the central hole (1522) and the inlet hole (1523); the threaded hole (1521) is screwed to the external threaded protrusion ring (1512), and the internal beveled end face (1524) and the external beveled end face (1514) form a wedge fit, driving the fastening flap (1515) to contract; the external terminal (7) passes through the inlet hole (1523) and extends into the fastening flap (1515).

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