CN203504870U - Atmospheric pressure magnetic field enhanced low-temperature plasma electric brush generating device - Google Patents
Atmospheric pressure magnetic field enhanced low-temperature plasma electric brush generating device Download PDFInfo
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- CN203504870U CN203504870U CN201320642902.6U CN201320642902U CN203504870U CN 203504870 U CN203504870 U CN 203504870U CN 201320642902 U CN201320642902 U CN 201320642902U CN 203504870 U CN203504870 U CN 203504870U
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Abstract
The utility model provides an atmospheric pressure magnetic field enhancement type low-temperature plasma electric brush generating device, which comprises a main cavity with an air inlet port and an air outlet port, a pair of main discharge electrodes and a pair of dielectric barrier discharge flat electrodes, wherein the main cavity is made of insulating materials; the air outlet port is in a narrow slit shape, a narrow slit cavity is formed in the part, close to the air outlet port, in the main body cavity, and the ratio of the width to the thickness of the air outlet port is 5-100; the discharge end of the main discharge electrode is positioned at the narrow slit cavity; the flat plate electrode is positioned between the air inlet port and the main discharge electrode and is used for pre-ionizing working gas; and the permanent magnet is arranged outside the narrow-slit cavity, so that the traveling path of electrons and ions generated by discharge is changed. The utility model discloses utilize electromagnetic induction principle ingeniously, realized the purpose that reduces work energy consumption and running cost portably effectively.
Description
Technical field
The utility model relates to a kind of low temperature plasma brush generator.
Background technology
Disclosed dielectric barrier discharge enhanced-type low-temperature plasma brush generation device in Chinese patent ZL201210006023.4 < < dielectric barrier discharge enhanced-type low-temperature plasma brush generation device > >, by a main body chamber, a pair of main discharge electrode, a pair of dielectric barrier discharge (DBD) plate electrode, a current-limiting resistance, a mass flowmenter and two power-supply devices form.Main body chamber comprises two ports, and a port is air inlet port, and another port is the port of giving vent to anger, the indoor part self-assembling formation narrow slit cavity near this port of giving vent to anger of main cavity.At narrow slit cavity place, arranging two electrodes of main discharge, electrode mutually over against electric discharge end face be plane or tip-like.On the loop of main discharge electrode, be also in series with current-limiting resistance.Between air inlet port and the position of main discharge electrode, be also provided with in order to working gas is carried out to a pair of DBD plate electrode of preionization, two plate electrode metal surfaces are close on narrow slit chamber outer wall.Main body chamber is by making as polymer or the insulating ceramic materials of polytetrafluoroethylene one class; Electrode is heat-resisting metal material.For providing the power supply of discharge voltage, main discharge electrode both can adopt direct current also can adopt interchange; For plate electrode provides the power acquisition AC power of discharge voltage.Mass flowmenter is used for controlling the plasma flow of the chamber of flowing through.The current-limiting resistance of connecting in circuit can suppress the electric field fluctuation of cathode zone, and between restriction the two poles of the earth, the size of discharging current, prevents that glow discharge is transformed into arc discharge, thereby make can produce stable glow discharge in gas chamber.
During work, allow working gas (plasma maintains gas and/or active gases) from air inlet port inflow chamber chamber, when flowing through the two corresponding regions of plate electrode, additional certain alternating voltage on two electrodes, voltage magnitude is controlled near working gas breakdown threshold, guarantees that DBD power is not more than 1W.Before the pretreated part preionization of DBD gas is passing through chamber, on close corresponding two electrodes of port main discharge of giving vent to anger, additional certain voltage excites the working gas of preionization again, make the plasma jet of its discharge generation brush shape, from the port ejection of giving vent to anger, form atmos low-temperature plasma brush.
Although compare with traditional plasma producing apparatus, this device is with the obvious advantage, its structure is simple and clear, without expensive vacuum system, just can under normal pressure, produce low-temperature plasma jet, and plasma jet discharges more stable, has also reduced to a certain extent work energy consumption.
Yet further from energy-saving and emission-reduction be maintained in original consideration, this device is still not satisfactory.Owing to being provided with current-limiting resistance in discharge loop, still there iing more energy consumption on resistance and be wasted; Secondly, in order to produce the plasma jet of larger volume, need higher gas flow, thereby increased operating cost.
Utility model content
The utility model provides a kind of atmospheric pressure magnetic-field-enhanced low temperature plasma brush generator, and the technical scheme in background technology is improved, and reduces to a greater degree work energy consumption and operating cost.
For realizing above utility model object, the utility model provides following technical scheme:
The magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure, comprises and has air inlet port and give vent to anger the main body chamber of port, a pair of main discharge electrode and a pair of dielectric barrier discharge plate electrode, main body chamber is made by insulating material; The described port of giving vent to anger is narrow slit shape, and the indoor part near this port of giving vent to anger of main cavity forms narrow slit cavity, and the width of the port of giving vent to anger is 5～100 with the ratio of thickness; The discharge end of described main discharge electrode is positioned at described narrow slit cavity place; Described plate electrode, between air inlet port and main discharge electrode, is used for preionization working gas; It is characterized in that: in narrow slit cavity outside, be provided with permanent magnet, the electronics of discharge generation and the conduct of ion are changed.
Based on above-mentioned basic scheme, the utility model is also done following optimization and is limited and improve:
Above-mentioned permanent magnet is a pair of, is symmetricly set in narrow slit cavity outside, and magnetic field B direction is vertical with the electric current J of main discharge region.
The version of above-mentioned narrow slit cavity can be: main cavity is indoor to be shunk gradually or is tending towards flat from air inlet port to the port of giving vent to anger; Or the indoor integral body of main cavity is narrow slit cavity, and effect is better.
If the narrow slit cavity that the indoor integral body of preferred main cavity described above is cuboid, the metal surface of plate electrode is close on narrow slit chamber outer wall along cuboid broadside is parallel, and the chamber wall of narrow slit cavity is as the insulating medium layer of plate electrode dielectric barrier discharge; Plate electrode and main discharge electrode are not less than 1mm along the spacing of working gas flow velocity direction.
Magnetic field B is overwrite media barrier discharge and main discharge region comprehensively, the electric current J(main discharge electric field E of magnetic field B direction and main discharge region) vertical, parallel with dielectric barrier discharge electric field, and J * B is along gas flow direction.
The distance of above-mentioned permanent magnet and narrow slit chamber outer wall is not more than 10mm and is advisable.Magnetic field B is that 500～20000 Gausses are advisable.
Best series limiting resistor again on the loop of above-mentioned main discharge electrode.
For plate electrode provides the power acquisition AC power of discharge voltage, adjustable in the radio-frequency region of the frequency of AC power from power frequency to 13.56MHz; Electric source modes is continuous or impulse form; Wherein, the discharging current effective value of plate electrode is not more than 10mA.(discharge voltage amplitude is determined according to the chamber wall thickness because of discharge voltage and slit width, working gas classification, both sides, generally at 100～9000 volts)
When above-mentioned plate electrode dielectric barrier discharge power is not more than 1W, working gas flow velocity is 1～100L/min; Better with 1～30L/min.
Aforementioned body chamber (chamber wall) can be made by polytetrafluoroethylene, insulating ceramics or both composite materials.
Above-mentioned main discharge electrode and plate electrode preferably adopt the electrode of being made by copper, aluminium, tungsten, nickel, tantalum, platinum or its alloy, two main discharge electrodes mutually over against electric discharge end face be plane or tip-like.
The utility model utilizes electromagnetic induction principle dexterously, has realized the object that reduces work energy consumption and operating cost simple and effectively.Specifically there is following remarkable result:
(1) in identical operating current situation, operating voltage is lower, and plasma discharge power is less.
(2) in identical operating current situation, can produce more large scale, the better plasma of uniformity, active specy is also abundanter.
(3) can under lower operating current condition, obtain larger sized plasma jet, the Joule heat of consumption on current-limiting resistance also still less, can extend the useful life of main discharge electrode and current-limiting resistance.
Accompanying drawing explanation
Fig. 1 is the utility model (background technology) main cavity cell structure schematic diagram while not configuring permanent magnet.
Fig. 2 (a) and Fig. 2 (b) are the structural representation of the utility model device.
Fig. 3 is the work schematic diagram of the utility model device.
The plasma jet of (background technology) when Fig. 4 (a) does not configure permanent magnet for the utility model, Fig. 4 (b) is the plasma jet of the utility model device.
Embodiment
Those skilled in the art consider plasma generating means reduction work energy consumption and operating cost, normally by regulating impressed DC voltage minimizing discharging current or adjust flux controller to reduce working gas flow, realize.Yet the minimizing of discharging current or gas flow can be dwindled the volume of plasma jet, reduce the operating efficiency of plasma producing apparatus, even can not produce stable plasma jet, it cannot normally be worked.
The utility model, through a large amount of theoretical and experimental studies, utilizes electromagnetic induction principle dexterously, has obtained significant effect.Concrete operation principle is: working gas (plasma maintains gas and/or active gases) first carries out preionization through dielectric barrier discharge.The working gas of the part preionization main discharge region of flowing through again discharges, and makes main discharge region have a large amount of electric charge (electronics and negative ions).Electric charge (being mainly electronics) is subject to the effect of Lorentz force under the impact in magnetic field, straight line during You Weijia magnetic field, its path becomes curve, increased stroke and the life-span of electronics at discharge space, and degree of ionization, make electronics can with more gas molecule ionization by collision or excite and produce more electronics and active specy again, and increase the chemism of plasma; The conduct of electronics is become after curve by straight line, and discharge space is no longer confined on the straight line of two electrode connecting lines, but expands to larger space, makes electric discharge more even; Because the general direction of electric current is by anode directed negative electrode, so the direction of Lorentz force is consistent with airflow direction, can accelerated charge move along airflow direction, form the plasma jet of more volume; The increase of degree of ionization makes in identical operating current situation, and operating voltage is lower, and discharge power is less; The increase of degree of ionization and the increase of discharge space make plasma device under less operating current and working gas flow condition, can obtain the plasma jet of larger volume, reduce Joule heat and operating cost on current-limiting resistance simultaneously.
As shown in Figure 1 and Figure 2, with respect to background technology (scheme of ZL201210006023.4), the structural improvement major embodiment of the utility model is as follows.
In the both sides of the wider outer surface of narrow slit cavity, arrange another to parallel to each other over against permanent magnet.Permanent magnet is generally cuboid, and magnetic field covers main discharge and dielectric barrier discharge region, and its direction is vertical with main discharge electric field E or electric current J, and parallel with dielectric barrier discharge electric field, and J * B is along gas flow direction; The distance of permanent magnet and narrow slit chamber outer wall is not more than 10mm, and magnetic field is 500～20000 Gausses.
During work, allow working gas (plasma maintains gas and/or active gases) from air inlet port inflow chamber chamber, when flowing through the two corresponding regions of plate electrode, additional certain alternating voltage on two electrodes, voltage magnitude is controlled near working gas breakdown threshold, makes DBD power be not more than 1W.Before the gas of DBD preionization is passing through chamber, again excite the working gas of preionization near the additional certain voltage of port main discharge electrode of giving vent to anger, form the plasma flow that contains a large amount of electronics and negative ions.After externally-applied magnetic field, these plasmas from the port ejection of giving vent to anger, form the brush shape plasma jet of more volume under the acting in conjunction of air draft force and magnetic field Lorentz force.This jet has the living features of non-equilibrium plasma, can be used for carrying out plasma surface treatment and cleaning, plasma-deposited, plasma sterilization and plasma for purification.
Be described in further detail structure of the present utility model and the course of work below.
The magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure comprises main body chamber 12, and main body chamber 12 has two ports, a port one 4 and another port one 6.Plasma maintains gas and active gases flows into chamber, the narrow slit cavity of the main body of flowing through chamber 12 inside (the interior integral body of main body chamber 12 is narrow slit cavity in the present embodiment) from port one 4.
Temperature plasma brush generation device also comprises two electrodes, an electrode 20 and another electrode 22.Electrode 20 and electrode 22, all in the inside of main body chamber 12, face mutually, and near port one 6.
Between port one 4 and electrode 20 or 22, temperature plasma brush generation device also comprises two parallel- plate electrodes 17 and 18, and electrode 17 and electrode 18 lay respectively at both sides outside cavity.
In the both sides of the wider outer surface of narrow slit cavity, temperature plasma brush generation device also comprises a pair of parallel to each other, and over against permanent magnet 42 and permanent magnet 44.
Plasma maintains gas and active gases flows into main body chamber 12 from port one 4 constantly, first flow through electrode 17 and the corresponding region of discharge of electrode 18, be not more than some work gas generation preionization under the power of 1W, gas after preionization flow through again electrode 20 and the corresponding region of discharge of electrode 22, when electrode 20 and 22 both end voltage are enough high, gas will be punctured again, forms the plasma flow that contains a large amount of electronics and negative ions in chamber interior.The magnetic line of force of permanent magnet 42 and permanent magnet 44 is through electrode 20 and the corresponding region of discharge of electrode 22, and plasma from port one 6 ejections, forms the plasma jet 24 of brush shape under the acting in conjunction of air draft force and magnetic field Lorentz force.
Fig. 3 is the work schematic diagram of the magnetic-field-enhanced low temperature plasma brush generator 26 of atmospheric pressure of the present utility model.Temperature plasma brush generation device 26, except containing an agent structure 10, also comprises current-limiting resistance 28 and power-supply device 30 and power-supply device 40.Power-supply device 30, for electrode 20 and the electrode 22 near port one 6 places provides discharge voltage, forms main discharge circuit; Power-supply device 40, for electrode 17 and electrode 18 provide discharge voltage, forms dielectric barrier discharge loop.
During work, the plasma of certain flow maintains gas and active gases first flow through electrode 17 and the corresponding region of discharge generation of electrode 18 preionization, gas after preionization flow through again electrode 20 and the corresponding region of discharge of electrode 22, when the voltage that is added in electrode 20 and 22 two ends is enough high, the gas in region between two electrodes of flowing through is just punctured again, there are electric discharge phenomena, form the plasma flow that contains a large amount of electronics and negative ions.Plasma from port one 6 ejections, forms the plasma jet 24 of brush shape under the acting in conjunction of air draft force and permanent magnet 42 and 44 magnetic field Lorentz forces.The plasma jet 24 that temperature plasma brush generation device 26 is produced touches the surface of processed object 36, and suitably contacts and move around with it, just can process whole surface or the pretreating surface of object 36.
By experiment, verified that the utility model device can increase plasma size significantly, and reduced energy consumption.Below illustrate.
Under atmospheric environment, adopt the utility model device to test, the spacing of this device main discharge electrode end face is 15mm, and main discharge electrode diameter is 0.9mm; Additional sinusoidal voltage makes the gas generation preionization of inside cavity, voltage magnitude 1.76KV, frequency 9.0KHz, the about 12mW of dielectric barrier discharge power; Main discharge current 10mA, discharge voltage 274V, current-limiting resistance 100K Ω.Fig. 4 has shown the plasma jet having or not in the auxiliary situation in magnetic field, and wherein Fig. 4 (a) is the situation that does not add magnetic field, and Fig. 4 (b) is for adding the situation in magnetic field.From Fig. 4 (a), can find out, when not adding magnetic field, plasma jet can only form in port 16 parts of giving vent to anger, and skewness, also unstable.After adding magnetic field, as shown in Fig. 4 (b), above the port 16 of giving vent to anger, form uniform and stable plasma jet.Comparison diagram 4 (a) and Fig. 4 (b), can find that plasma jet is under magnetic field auxiliary, and when its volume increases, the uniformity of plasma and stability have all obtained obvious improvement.In the situation that not adding magnetic field, if expect the plasma jet of same volume, and keep the flow of gas constant, main discharge current need increase to 27mA.The introducing in magnetic field makes plasma discharge power reduce to 2.7W from 7.4W, and the Joule heat on current-limiting resistance reduces to 10W from 73W, and total energy consumption is reduced to 12.7W by 80.4W.As can be seen here, the utility model device has reduced energy consumption to a great extent.
Claims (10)
1. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure, comprises and has air inlet port and give vent to anger the main body chamber of port, a pair of main discharge electrode and a pair of dielectric barrier discharge plate electrode, and main body chamber is made by insulating material; The described port of giving vent to anger is narrow slit shape, and the indoor part near this port of giving vent to anger of main cavity forms narrow slit cavity, and the width of the port of giving vent to anger is 5～100 with the ratio of thickness; The discharge end of described main discharge electrode is positioned at described narrow slit cavity place; Described plate electrode, between air inlet port and main discharge electrode, is used for preionization working gas; It is characterized in that: in narrow slit cavity outside, be provided with permanent magnet, the electronics of discharge generation and the conduct of ion are changed.
2. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 1, is characterized in that: in narrow slit cavity outside, be symmetrically arranged with pair of permanent magnets, magnetic field B direction is vertical with the electric current J of main discharge region.
3. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 2, is characterized in that: main cavity is indoor to be shunk gradually or is tending towards flat from air inlet port to the port of giving vent to anger, or the indoor integral body of main cavity is narrow slit cavity.
4. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 3, it is characterized in that: the narrow slit cavity that the indoor integral body of described main cavity is cuboid, the metal surface of plate electrode is close on narrow slit chamber outer wall along cuboid broadside is parallel, and the chamber wall of narrow slit cavity is as the insulating medium layer of plate electrode dielectric barrier discharge; Plate electrode and main discharge electrode are not less than 1mm along the spacing of working gas flow velocity direction.
5. according to the arbitrary described magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure of claim 1 to 4, it is characterized in that: magnetic field B overwrite media barrier discharge and main discharge region, the electric current J(main discharge electric field E of magnetic field B direction and main discharge region) vertical, parallel with dielectric barrier discharge electric field, and J * B is along gas flow direction; The distance of permanent magnet and narrow slit chamber outer wall is not more than 10mm; Magnetic field B is 500～20000 Gausses.
6. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 5, is characterized in that: on the loop of main discharge electrode, be also in series with current-limiting resistance.
7. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 6, it is characterized in that: for plate electrode provides the power acquisition AC power of discharge voltage, adjustable in the radio-frequency region of the frequency of AC power from power frequency to 13.56MHz; Electric source modes is continuous or impulse form; Wherein, the discharging current effective value of plate electrode is not more than 10mA.
8. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 7, is characterized in that: plate electrode dielectric barrier discharge power is not more than 1W, and working gas flow velocity is 1～100L/min.
9. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 8, is characterized in that: described main body chamber is made by polytetrafluoroethylene, insulating ceramics or both composite materials.
10. the magnetic-field-enhanced low temperature plasma brush generator of atmospheric pressure according to claim 9, it is characterized in that: described main discharge electrode and plate electrode are the electrode that copper, aluminium, tungsten, nickel, tantalum, platinum or its alloy are made, two main discharge electrodes mutually over against electric discharge end face be plane or tip-like.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533733A (en) * | 2013-10-17 | 2014-01-22 | 中国科学院西安光学精密机械研究所 | Atmospheric pressure magnetic field enhanced low-temperature plasma electric brush generating device |
| CN105792495A (en) * | 2016-05-03 | 2016-07-20 | 河北大学 | Apparatus of generating atmospheric-pressure uniform plasma brush and method thereof |
| CN106686871A (en) * | 2016-12-15 | 2017-05-17 | 南京克普医疗科技有限公司 | Atmospheric pressure plasma gas generator of three electrodes and implementation method |
| CN109289457A (en) * | 2018-10-30 | 2019-02-01 | 浙江大学 | A kind of greenhouse gases reforming unit and method for reinforcing blade slides arc using magnetic field |
| CN109951945A (en) * | 2019-03-14 | 2019-06-28 | 中国科学院合肥物质科学研究院 | A kind of platypelloid type large-area high-density DC arc discharge plasma source |
| CN111479376A (en) * | 2020-06-01 | 2020-07-31 | 深圳先进技术研究院 | Atmospheric pressure injection frequency thermal plasma generator based on preionization ignition device |
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2013
- 2013-10-17 CN CN201320642902.6U patent/CN203504870U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103533733A (en) * | 2013-10-17 | 2014-01-22 | 中国科学院西安光学精密机械研究所 | Atmospheric pressure magnetic field enhanced low-temperature plasma electric brush generating device |
| CN103533733B (en) * | 2013-10-17 | 2016-06-08 | 中国科学院西安光学精密机械研究所 | Atmospheric pressure magnetic field enhanced low-temperature plasma electric brush generating device |
| CN105792495A (en) * | 2016-05-03 | 2016-07-20 | 河北大学 | Apparatus of generating atmospheric-pressure uniform plasma brush and method thereof |
| CN106686871A (en) * | 2016-12-15 | 2017-05-17 | 南京克普医疗科技有限公司 | Atmospheric pressure plasma gas generator of three electrodes and implementation method |
| CN109289457A (en) * | 2018-10-30 | 2019-02-01 | 浙江大学 | A kind of greenhouse gases reforming unit and method for reinforcing blade slides arc using magnetic field |
| CN109289457B (en) * | 2018-10-30 | 2020-12-18 | 浙江大学 | Greenhouse gas conversion device and method for enhancing sliding arc of blade by using magnetic field |
| CN109951945A (en) * | 2019-03-14 | 2019-06-28 | 中国科学院合肥物质科学研究院 | A kind of platypelloid type large-area high-density DC arc discharge plasma source |
| CN111479376A (en) * | 2020-06-01 | 2020-07-31 | 深圳先进技术研究院 | Atmospheric pressure injection frequency thermal plasma generator based on preionization ignition device |
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