NL2032381B1 - Portable system for generating air glow discharge plasma jets - Google Patents
Portable system for generating air glow discharge plasma jets Download PDFInfo
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- NL2032381B1 NL2032381B1 NL2032381A NL2032381A NL2032381B1 NL 2032381 B1 NL2032381 B1 NL 2032381B1 NL 2032381 A NL2032381 A NL 2032381A NL 2032381 A NL2032381 A NL 2032381A NL 2032381 B1 NL2032381 B1 NL 2032381B1
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- electrode
- plasma jets
- plasma
- discharge
- generating
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- 238000004501 airglow Methods 0.000 title claims abstract description 19
- 230000005684 electric field Effects 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000001603 reducing effect Effects 0.000 abstract description 4
- 238000004381 surface treatment Methods 0.000 abstract description 4
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000001954 sterilising effect Effects 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 5
- 241000894006 Bacteria Species 0.000 description 4
- 241000700605 Viruses Species 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000011261 inert gas Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 101100352755 Drosophila melanogaster pnt gene Proteins 0.000 description 1
- 239000004831 Hot glue Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 239000002245 particle Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/4697—Generating plasma using glow discharges
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
Abstract
Disclosed is a portable system for generating air glow discharge plasma jets. The portable system includes a high—voltage direct— current power supply, an adjustable current—limiting resistor, a high—voltage electrode, a grounding electrode, an electrode 5 support frame and a gas gap, where a distance between the high— voltage electrode and the grounding electrode is adjustable. After being connected to the power supply, the portable system generates the plasma jets. The present invention can generate the uniform air glow discharge plasma jets under the same technical condition, 10 thereby reducing production cost of the plasma jets, simplifying a structural size of a generation treatment device, eliminating space limitation of a large device for generating plasma, and further expanding an application range of the plasma jets in the fields of material surface treatment, sterilization and 15 disinfection, plasma medicine, environmental engineering and some high and new technologies.
Description
P1447 /NLpd
PORTABLE SYSTEM FOR GENERATING AIR GLOW DISCHARGE PLASMA JETS
The present invention relates to a plasma jet source which has high generation safety, high stability and high plasma densi- ty, and in particular to a portable system for generating air glow discharge plasma jets.
The glow discharge plasma jet can be generated in the open space outside the electrode, rather than limited in the narrow discharge gap (such as dielectric barrier discharge), which great- ly reduces the requirements for the device for generating jets and the structure size of the treated object. When the portable glow discharge plasma jet is used to treat the skin, tissues and organs of organisms and various material surfaces, the convenience and safety are significantly improved.
At present, the general method for forming glow discharge plasma jets is implemented by using alternating-current high- voltage pulse discharge in the flowing inert gas environment. The large-size gas pump and gas cylinder providing an inert gas envi- ronment limit the application environment of plasma jets. In addi- tion, the jet length and jet intensity required by different ap- plication environments are different. The traditional device for generating plasma jets is usually a fixed electrode structure, which can only be applied to the scenes having fixed conditions.
Once the conditions are changed or the application scenes are changed, it is necessary to readjust the relevant parameters in- side the system for generating plasma jets, thereby reducing effi- ciency, and having great limitations and poor applicability.
Therefore, on the basis of the previous research, a portable sys- tem for generating air glow discharge plasma jets is provided herein. The adjustable module in the system includes the adjusta- ble resistor and the adjustable electrode structure. The adjusta- ble module enables the system for generating plasma jets to pro-
vide the most suitable plasma jets under the switching of differ- ent application scenes, greatly improving the practicability of the system for generating plasma jets, moreover, moreover, reduc- ing the existence of gas cylinders, air pumps and vacuum chambers, increasing the flexibility of the generation system and improving the space utilization.
In the previous research, the formation mechanism of the at- mospheric pressure air glow discharge plasma jets was explored, and the tip extension ionization theory was put forward, which re- vealed that the fundamental reason for the formation of the atmos- pheric pressure glow discharge plasma jets was the formation of a space electric field having conductivity changes. The difference of ionization degree caused by the difference between the elec- trode tip and the lateral electric field intensity is the neces- sary condition for the plasma jets to develop forwards. However, the length and intensity of the generated plasma jets change lit- tle by using a fixed single needle electrode, which has limita- tions. In order to form plasma jets which can be widely applied in the fields of material surface treatment, sterilization and disin- fection, plasma medicine, environmental engineering and some high and new technologies, it is necessary to further optimize the sys- tem for generating plasma jets to generate plasma jets having an adjustable length and intensity and more environmental applicabil- ity.
The present invention is the practice structure provided by the inventor on the basis of previous theoretical research.
An embodiment of the present invention provides a portable system for generating air glow discharge plasma jets, the objecti- ve of which is to design a plasma jet source which has high gene- ration safety, high stability and high plasma density, and may adaptively adjust lengths of generated jets according to actual application scenes.
In order to achieve the above objective, the present inven- tion uses the following technical solution: a portable system for generating air glow discharge plasma jets includes: a high-voltage direct-current power supply, which is con- nected to a discharge electrode and supplies energy to the system; and a discharge generation structure, which consists of the discharge electrode and an adjustable support frame and is used for generating plasma jets, a length of the plasma being changed along with adjustment of the support frame.
Preferably, output power of the high-voltage direct-current power supply of the system should satisfy power required for a mi- nimum range to a maximum range adjustable by an electrode device.
Preferably, a current-limiting resistor of the system is a safety protection structure of the system and is mainly used for limiting magnitude of current in the system and preventing a phe- nomenon of overcurrent damage in the system.
Preferably, the adjustable support frame in the discharge ge- neration structure is mainly used for adjusting a relative posi- tion relation of a needle electrode and ring electrodes according to actual application requirements.
Preferably, the discharge electrode consists of a needle electrode and ring electrodes, the needle electrode and the ring electrodes of the discharge electrode being made of metal materi- als having excellent conductivity, the needle electrode being a conical electrode having all tips capable of forming an extremely non-uniform electric field, and the needle electrode 1 of the discharge electrode being connected to a positive high-voltage terminal of an external circuit by means of a wiring terminal.
Preferably, cross sections of the ring electrodes are centro- symmetric (e.g. circular, oval, square, etc.).
Preferably, the two ring electrodes are not limited to the same revolving body.
Preferably, the ring electrode 2 of the discharge electrode is grounded by means of a metal wire or is connected to the posi- tive high-voltage terminal of the external circuit by means of the wiring terminal.
It may be seen from the technical solution provided by the embodiment of the present invention that the embodiment of the present invention provides the portable system for generating air glow discharge plasma jets, which has the following beneficial ef- fects compared with the prior art: 1. compared with a traditional system for generating rare gas environment plasma jets, the portable system for generating air glow discharge plasma jets simplifies existence of an air pump and an air cylinder, and compared with a system for generating jets in a low air pressure environment, the portable system for generating air glow discharge plasma jets eliminates occupation of a vacuum chamber, improves space utilization, is not limited by a size of a device, truly and portably generates the plasma jets, and widens an application field of the plasma jets.
2. A general method for glow discharge plasma jets is imple- mented by using alternating-current high-voltage pulse discharge by means of a fixed electrode structure in a flowing inert gas en- vironment.
The present invention uses a portable adjustable elect- rode structure to generate the glow discharge plasma jets in an air environment.
Compared with a traditional mode, when viruses, bacteria, etc. are treated, the portable system for generating ad-
justable plasma jets may adjust a discharge intensity and a discharge length according to specific situations of practical ap- plication according to different types of treated objects and dif- ferent surface morphologies of objects to which the viruses and the bacteria are attached, and has excellent environment adaptabi-
lity; and when a surface of a material is treated, energy carried by the plasma may be changed according to a change of the materi- al, thereby carrying out treatment of different degrees, satisfy- ing different treated requirements, and improving uniformity and treatment efficiency of surface treatment.
3. Design of an adjustable distance needle-ring electrode structure of the present invention breaks limitation of the elect- rode structure on generation lengths of the jets, thereby greatly increasing an effective plasma action area, and satisfying a chan- ge of different environmental conditions.
A distance between a high-voltage end and a ground potential is reduced, thereby effec- tively reducing initial discharge voltage.
4. The safety and stability of the whole portable system for generating air glow discharge plasma jets may be improved by using the high-voltage direct-current power supply for energy transmis- sion, and compared with a traditional alternating-current power supply mode, energy which may be transmitted by direct-current 5 discharge exists in a whole discharge period, and therefore, the portable system for generating air glow discharge plasma jets has the advantage of high discharge efficiency. 5. A mode of uniformly arranging a plurality of groups of needle-ring electrodes having heteropolar potentials is used, the- reby overcoming a divergence effect of edge plasma jets favorably to form a uniform array type atmospheric pressure air array plasma jet, improving treatment efficiency, and satisfying large-scale industrial application requirements.
Additional aspects and advantages of the present invention will be set forth partially in the following description, which will become obvious in the following description, or may be lear- ned by practice of the present invention.
FIG. 1 is a structural schematic diagram of a portable system for generating air glow discharge plasma jets provided in an embo- diment of the present invention;
FIG. 2 is a schematic diagram of an adjustable electrode three-dimensional structure of a portable system for generating air glow discharge plasma jets provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an overhead structure of an adjustable electrode of a portable system for generating air glow discharge plasma jets provided in an embodiment of the present in- vention;
FIG. 4 is a schematic diagram of a cross-sectional structure of an adjustable electrode of a portable system for generating air glow discharge plasma jets provided in an embodiment of the pre- sent invention; and
FIG. 5 is space electric field and power line distribution around an array electrode provided in an embodiment of the present invention.
A portable system for generating air glow discharge plasma jets of an embodiment of the present invention, which is shown in
FIGs. 1-4, includes a needle electrode 1, a ring electrode 2, a ring electrode 3, a support frame 4, a support frame 5, a support frame 6, a baffle 7, a track 8, an adjustable current-limiting re- sistor and a power supply system having a direct-current high- voltage output circuit, where the power supply system is connected to the needle electrode 1.
As shown in FIG. 1, a cylindrical end of the needle electrode 1 is connected to a positive high-voltage terminal of an external circuit by means of a wiring terminal; for a needle-ring electrode structure, the ring electrode 2 is grounded by means of a metal wire or is connected to the positive high-voltage terminal of the external circuit by means of the wiring terminal; and for a need- le-ring-ring electrode structure, the ring electrode 2 is grounded by means of the metal wire or is connected to the positive high- voltage terminal of the external circuit by means of the wiring terminal, and the ring electrode 3 is grounded by means of a metal wire.
As shown in FIG. 2, the needle electrode 1, the ring electro- de 2 and the ring electrode 3 form an electrode structure for ge- nerating plasma jets, and the needle electrode 1, the ring elect- rode 2 and the ring electrode 3 are bonded and fixed to the sup- port frame 4, the support frame 5 and the support frame 6 by means of an insulating tape and a hot melt adhesive respectively. The support frame 4 and the baffle 7 are fixed to two ends of the track 8 respectively to have effects of supporting the needle electrode and limiting a distance between the electrodes, and the support frame 5 and the support frame 6 are connected to the track 8 by means of mechanisms capable of improving precision adjust- ment, such as sliding wheels, gears and racks, electromagnetism, etc. to adjust the distance between the electrodes. A discharge electrode works in atmospheric pressure air and consists of the needle electrode and the ring electrodes; and one end of the need- le electrode 1 is made into a conical structure, and the conical end is a discharge end and is connected to the positive high-
voltage terminal of the external circuit by means of the wiring terminal. However, a conical tip of a cone is not easily too poin- ted, and otherwise, a difference between the tip and a lateral electric field is small, which does not facilitate formation of the plasma jets.
In the embodiment of the present invention, a direct-current high-voltage power supply having maximum output voltage of 30 kV is used.
An adjustable resistor range is 2 MQ to 10MQ.
The needle electrode 1 is placed coaxially with the ring electrodes 2, 3.
The needle electrode 1, the ring electrode 2 and the ring electrode 3 are made of iron metal having excellent conduction characteristics.
For ease of understanding, detailed dimensions of heteropolar and homopolar needle-ring electrodes used in the embodiment of the present invention are provided below respectively. The needle electrode 1 is a stainless steel needle having a cylindrical por- tion and a conical portion. A diameter of the cylindrical portion is 0.5 mm, a length of the conical portion is 2.5 mm, and a diame- ter of a tip is approximately 0.2 mm. For the heteropolar needle- ring electrode, the ring electrode uses a stainless steel ring, and has a radius r equal to 5 mm, and a height h equal to 1.5 mm, and a center of the ring electrode is located at a position d;=-2 mm in front of the tip of the needle electrode. For the homopolar needle-ring electrode, the ring electrode uses a stainless steel ring, and has a radius r equal to 7.5 mm, and a height h equal to 2.5 mm, and a center of the ring electrode is located at a posi- tion d;=2.5 mm in front of the tip of the needle electrode.
A discharge power supply uses a direct-current discharge form, and a specific plasma jet generation system is shown in FIG. 1. A positive electrode of a direct-current power supply is con- nected to a resistor R having a maximum resistance of 10 MQ through a tail end of the needle electrode and finally is con- nected to a negative electrode of the power supply, and the nega- tive electrode of the power supply is grounded.
In an air environment, the glow discharge plasma jets are ge-
nerated, and when viruses, bacteria, etc. are treated, the porta- ble system for generating adjustable plasma jets may adjust a discharge intensity and a discharge length according to specific situations of practical application according to different types of treated objects and different surface morphologies of objects to which the viruses and the bacteria are attached, and has excel- lent environment adaptability; and when a surface of a material is treated, energy carried by the plasma may be changed according to a change of the material, thereby carrying out treatment of diffe- rent degrees, and satisfying different treated requirements. The- refore, the generation system provided by the embodiment of the present invention has the advantages of flexible practical appli- cation, capability to improve uniformity of surface treatment, treatment efficiency and a space utilization rate, etc., saves cost required by plasma jet generation, and widens an application range of practical use.
A plurality of groups of heteropolar potential needle-ring (grounding) electrodes are expanded in a transverse direction and a longitudinal direction to form an array, and a center distance of each array unit is 12 mm. Space electric field and power line distribution around an array electrodes is shown in FIG. 5.
An arrangement mode of the array electrode and the distance between the array units have great influence on formation of an array jet. Improvement of uniformity of space electric field dis- tribution of the array electrode contributes to generation of the uniform plasma jets. It may be seen by means of electric field simulation that in such the electrode arrangement mode, the space electric field of the tip of each needle electrode is symmetrical- ly distributed, and a strong electric field area is located right in front of the tip all the time. Moreover, due to no action of airflow, charged particles are not blown away from an axis direc- tion of the needle-shaped electrode to cause dispersion of jets at an edge of an array. Therefore, linear array plasma jets are fi- nally formed.
Claims (8)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2032381A NL2032381B1 (en) | 2022-07-05 | 2022-07-05 | Portable system for generating air glow discharge plasma jets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2032381A NL2032381B1 (en) | 2022-07-05 | 2022-07-05 | Portable system for generating air glow discharge plasma jets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL2032381B1 true NL2032381B1 (en) | 2024-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL2032381A NL2032381B1 (en) | 2022-07-05 | 2022-07-05 | Portable system for generating air glow discharge plasma jets |
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| Country | Link |
|---|---|
| NL (1) | NL2032381B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110430654A (en) * | 2019-06-27 | 2019-11-08 | 北京交通大学 | A kind of Review of glow plasma jet device of needle-ring structure |
| EP3846592A1 (en) * | 2018-08-29 | 2021-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Voltage application device and discharge device |
-
2022
- 2022-07-05 NL NL2032381A patent/NL2032381B1/en active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3846592A1 (en) * | 2018-08-29 | 2021-07-07 | Panasonic Intellectual Property Management Co., Ltd. | Voltage application device and discharge device |
| CN110430654A (en) * | 2019-06-27 | 2019-11-08 | 北京交通大学 | A kind of Review of glow plasma jet device of needle-ring structure |
Non-Patent Citations (1)
| Title |
|---|
| WENZHENG LIU ET AL: "Study of generation characteristics of glow-type atmospheric-pressure plasma jet based on DC discharge in air", PLASMA SCIENCE AND TECHNOLOGY, INSTITUTE OF PHYSICS PUBLISHING, BRISTOL, GB, vol. 21, no. 12, 1 October 2019 (2019-10-01), pages 125404, XP020344523, ISSN: 1009-0630, [retrieved on 20191001], DOI: 10.1088/2058-6272/AB4160 * |
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