CN105478240A - Electric discharging device of rotation electrode - Google Patents
Electric discharging device of rotation electrode Download PDFInfo
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- CN105478240A CN105478240A CN201410469210.5A CN201410469210A CN105478240A CN 105478240 A CN105478240 A CN 105478240A CN 201410469210 A CN201410469210 A CN 201410469210A CN 105478240 A CN105478240 A CN 105478240A
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Abstract
The invention belongs to the technical field of low-temperature plasma application, and relates to an electric discharging device of a rotation electrode. The device comprises an impeller, a rotation electrode, a fixed electrode, and an electric motor, wherein the rotation electrode is arranged between the electric motor and the fixed electrode, and is fixedly arranged on the impeller or a shaft of the electric motor. The electric motor drives the impeller and the rotation electrode to move. High voltage is applied between the rotation electrode and the fixed electrode, and corona discharging is generated between the two electrodes. Since the electric motor drives the rotation electrode to move, corona rotates with the movement to draw a large-volume plasma area. Plasma is uniformly dispersed in a whole airflow channel between the two electrodes. Therefore, the electric discharging device can be applied to an air purifier and allows no dead corner to be left during purification. Moreover, the rotation electrode can greatly reduce the ozone yield, and prolongs the service life of asymmetric electrodes.
Description
Technical field
The present invention relates to lower temperature plasma technology field, be specifically related to the electric discharge device of rotation electrode.
Background technology
In recent years, becoming increasingly conspicuous of environment deterioration problem, the application of lower temperature plasma technology in environmental protection is also more and more concerned, and plasma organic waste gases purifying, plasma purification of waste water, plasma purifying vehicle exhaust and plasma remove the correlation technique such as formaldehyde, TVOC and PM2.5 and product development is subject to unprecedented attention.
The PM2.5 that fossil fuel burning produces and interior decoration finishing bring formaldehyde, TVOC to pollute, and day by day become the key factor having a strong impact on people's living standard.And for house ornamentation pollution, the existence of the VOC headed by formaldehyde in room air, the healthy of people in serious harm, and the existence of these gases can cause the disease of the aspects such as respiratory system, nervous system, reproductive system.The suction of a small amount of short-term can cause dizziness, headache, nauseating, uncomfortable in chest, weak, clouding of consciousness, failure of memory, the symptom such as thinking and judgment reduction; If suctions a large amount of for a long time can cause nasal cavity, oral cavity, skin and gastral cancer, cause newborn teratogenesis, and affect marrow hemopoiesis function and leukemogenesis, the mankind have the illness of 70% relevant to the pollutant of these indoor, and child's leukaemia of more than 90% is all caused by the dusty gas of indoor.
In order to improve indoor air quality, the people are attempting adopting various method:
(1) plant ecological method: green plants has certain improvement result to indoor environment, the plant such as bracketplant, aloe can remove formaldehyde, but green plants purifies air, existence takes effect slow and absorbs tired, no longer play a role after a period of time, pollen existence can form new pollution, and the effect of plant night respiration can cause plant and people to breathe to strive oxygen in addition, PM2.5 can not be removed, at present, indoor plantation green plants, for the just a kind of supplementary means that purifies air.
(2) physisorphtion: the absorbent-type such as active carbon, zeolite material can effective adsorption fouling thing, and the air purifier majority existed in the market is exactly utilize this technology.But sorbing material exists saturated phenomenon, be only shifted by pollutant, adsorbing some cycles will no longer play a role, if changed frequently, will produce huge cost payout.At present, most of air purifier on market all adopts physical absorption and filtering technique, therefore, there is the problem of rapid decay in absorption and filter effect, the later stage needs frequent replacing to adsorb and filtering material, and use cost is high, and filtering material vapour lock is large, energy consumption is also higher, also cannot filter less than 0.3 micron dust, also can produce secondary pollution.
(3) Ozonation: utilize the strong oxidizing property of ozone to purify air, the harmful components in air can be removed, be applicable to moderate, slight pollution; But the material that ozone is inherently harmful to, and when adopting this technology to administer room, people wants room away from keyboard, so, be only applicable to unmanned place, can not dedusting.
(4) plasma purification method: utilize corona discharge to produce non-equilibrium plasma, wherein there are a large amount of active particle and Free Radical in pollutants such as formaldehyde, make it to decompose, and PM2.5 can be allowed charged and collected by electrode in the electric field, thus purify air.Plasma purification effect has the following advantages: and (a) undamped-and in lifetime, clean-up effect is several undamped; B () is capable of washing without the need to consumptive material-anode, Reusability; C () energy consumption is low-and vapour lock is little, and power of motor is low; (d) purification thoroughly-except Pm2.5, sterilization, except formaldehyde and TVOC settle at one go, also have extraordinary clean-up effect (e) non-secondary pollution-virus and bacterium to be all killed to the dust of less than 0.3 micron, be not collection.Therefore, plasma air purifying method is just received the concern of vast purification of air personage day by day.
But, in order to produce corona discharge, need to adopt asymmetry electrode discharging structure.At present, published corona discharge assembly all adopts fixed electrode structure, and namely electron emission radio pole is tapering or slim structure, and another electrode is generally plate profile structure.There is following problem in the corona discharge assembly for fixed electrode: (1) because point of discharge is all the time at tapering place, tapering sparking electrode easily ablated fall, this is guiding discharge pole life-span short basic reason; (2) because the local at tapering place discharges, another template surrounding them does not produce high-density plasma, and air-flow often advection cross the space between two groups of sparking electrodes, therefore, near template electrode air and fail fully to be purified by plasma just to leave plasma generator, purification of air is not thorough; (3) the local electric discharge of tapering place electrode is comparatively strong, causes yield of ozone too high.These problems just, limit plasma air purifying technology broader applications in air delivery product.Especially in order to control yield of ozone, significantly have to reduce discharge power, cause clean-up effect to be given a discount, this is also the reason that market upper part plasma air purifier is wanted using plasma and absorption and filtered complex technique, does not still break away from the dependence to consumptive material.
Adopt pulsed discharge mode substitute direct-current discharge and increase air velocity, all effectively can reduce yield of ozone, and can cathode life be extended.When discharge frequency is lower than 20kHz, yield of ozone is higher, when pulse frequency is higher than 40kHz, effectively could suppress the generation of ozone, extend cathode life, and under identical discharge power condition, frequency is higher, and yield of ozone is lower, and cathode life is longer.But, the manufacture difficulty of hyperfrequency high-voltage pulse power source is large, cost is high, volume is large, poor reliability, efficiency and the life-span on the low side, the voltage and the frequency that realize 10kV and more than 50kHz are very difficult simultaneously, thus, even if bear the high cost of high-frequency and high-voltage power supply, wishing to suppress the space of yield of ozone and prolongation cathode life very limited further by improving supply frequency, greatly limit its extensive use.Air velocity under identical discharge power condition is larger, yield of ozone is lower, cathode life is longer, but air velocity is too large, need high-power strong fan on the one hand, greatly increase energy consumption, on the other hand, air velocity is too fast, too of short duration in the plasma slab time of staying, make gas purification process not thorough.
Summary of the invention
The object of the invention is to not increase air velocity and energy consumption, under not adopting the prerequisite of hyperfrequency high-voltage pulse power source of high cost yet, solve that above-mentioned plasma air purifying method exists tapering or the problem that slim structure cathode life is short, yield of ozone is too high near plasma nonuniformity and negative electrode, uniform large area plasma should be obtained, suppress yield of ozone again, also will reduce the quick ablation of negative electrode.In order to address these problems, present invention employs the electric discharge device of rotation electrode, ultrahigh frequency pulses electric discharge and relative air-flow is at a high speed realized: be arranged on by rotation electrode on the wind wheel of centrifugal blower, axial flow blower, crossflow fan by the negative electrode rotated, or be fixed in the rotating shaft of centrifugal blower or axial flow blower, motor drive electrode rotates, make point of discharge can not rest on a point of rotation electrode for a long time, but slide in the tip being rotated in electrode with wind wheel, thus be beneficial to guard electrode, and the plasma of Large-Area-Uniform can be produced; The electrode rotated on the one hand makes the corona diffusion near tip open, be beneficial to and reduce tip temperature and ozone emission rate, also reduce the Recession rate of electrode, the electrode rotated on the other hand can obtain Large-Area-Uniform plasma, be full of whole air inlet cross section, avoid air from the possibility without plasma slab " escape ".
The electric discharge device of the rotation electrode of the present invention's design, comprise impeller 1, rotation electrode 2, fixed electrode 3 and motor 4, rotation electrode 2 is arranged between impeller 1 and fixed electrode 3, rotation electrode 2 is fixed in the rotating shaft of motor 4, or be fixed on impeller 1, rotation electrode 2 keeps good electrical to be connected with the metal bearing of motor 4 or impeller 1, high voltage between rotation electrode 2 and fixed electrode 3, corona discharge is produced between two arrays of electrodes, motor 4 drives impeller 1 and rotation electrode 2 High Rotation Speed, the rotation electrode 2 of High Rotation Speed drives corona to rotate, the plasma uniformity that corona discharge is produced is distributed in the whole flow area between two arrays of electrodes, air-flow is through corona discharge region, organic pollution is resolved into innocuous substance by the high energy particle in plasma, particle can bring electric charge, charged particle is easy to be collected by high electric field dust arrester, or by other adsorptions.
Preferably, described rotation electrode 2 is arranged in the rotating shaft of motor 4, or is fixed on impeller 1, and rotation electrode 2 keeps good electrical to be connected with the metal bearing of motor 4.Rotation electrode 2 is arranged in metallic impeller by the compactest design exactly, directly solves electrode rotary and electrical connection problem.As an electrode of electric discharge, connect motor shaft, therefore, line joinably, guarantees safety.
Preferably, described rotation electrode 2 discharges to fixed electrode 3 under the state of rotary motion.Conventional discharge device all adopts two fixed electrode structure, point of discharge rests on point electrode fixing point for a long time, heat and ion sputtering concentrate on tip, make eletrode tip ablating rate high, very easily guiding discharge stopping or streamer micro discharge in passivation, Uniform discharge deterioration, yield of ozone are significantly risen.Rotation electrode then can make point of discharge move, and is beneficial to the average heat Cumulate Sum ion reducing tip and spatters intensity, thus reduce eletrode tip ablation velocity, and, rotation electrode can make electric discharge evenly, make process not stay dead angle, these are that the electric discharge device of two fixed electrode is difficult to accomplish.
Preferably, described rotation electrode 2 is made up of fine metal mesh or conductive fiber silk screen, and vapour lock is extremely low.No matter rotation electrode is arranged on impeller is still arranged on motor shaft, and air-flow all needs to flow through rotation electrode, and therefore, rotation electrode must have fine air permeability, and it exists the vapour lock that should not enlarge markedly gas channel.The rotation electrode that conduction silk screen is made, not only solve vapour lock problem, the more important thing is, the filament ends of conductive filament network edge is fabulous Point Corona Discharge electrode, has high electric field enhancement effect, and, the ablation of appropriateness, even if filament ends shortens, do not change its sharpness yet, corona discharge stability can not be affected.In life-span, discharge stability, yield of ozone and suppression micro discharge etc., conduction screen electrode is all significantly better than traditional corona electrode, comprises easily broken fine wire electrode, the sawtooth of easily passivation and the thin ribbon shaped electrode of needlepoint electrode, easily formation breach.
Preferably, the spacing between described rotation electrode 2 and fixed electrode 3 is between 8-90mm.Owing to have employed the rotation electrode of fine wire, fine wire diameters is very little, filament ends electric field enhancement effect is high, therefore, spacing between rotation electrode 2 and fixed electrode 3 can narrow down to 8mm, and also not easily produce micro-arc discharge phenomenon, the spacing between rotation electrode 2 and fixed electrode 3 can expand 90mm to, do not need very high discharge voltage, widen the range of application of electric discharge device widely yet.
Preferably, described fixed electrode 3 is that conductive grid or sheet metal are made.When fixed electrode 3 is arranged perpendicular to air-flow aspect, when air-flow needs by fixed electrode 3, as depicted in figs. 1 and 2, fixed electrode 3 must adopt the conduction fence web frame of ultralow vapour lock; When fixed electrode 3 and airflow direction are tangent, as shown in Figure 3 and Figure 5, fixed electrode 3 both can adopt the conduction boom net of ultralow vapour lock to make, and sheet metal also can be adopted to be made into collecting electrode.
Preferably, described rotation electrode 2 and fixed electrode 3 discharging structure are arranged on front or the rear of motor 4.Rotation electrode 2 and fixed electrode 3 must be arranged on the same side of motor 4, and axial flow blower is as shown in Figure 1 driven to the electric discharge device of rotation electrode, rotation electrode 2 and fixed electrode 3 both may be arranged on air inlet side, also can be arranged on air-out side.
Preferably, described rotation electrode 2 has rotational symmetry and is such as arranged on a disk, or is arranged on a face of cylinder.No matter rotation electrode 2 is adopt banded silk screen to make or adopt silk screen disk to make, and rotation electrode 2 entirety formed must have rotational symmetry, guarantees that it can high-speed motion and do not produce vibrations or larger noise.
Preferably, described fixed electrode 3 has the structural form corresponding with rotation electrode 2, and the two is both planar shaped, or is both circular-arc-shaped design.The fixed electrode 3 of the rotation electrode 2 corresponding flat shape of planar shaped, the two be arranged in parallel; Columnar rotation electrode 2 corresponding circle tubular or circular arc fixed electrode 3, the two is coaxially arranged.
Preferably, described fixed electrode 3 can adopt semi-cylindrical shaped sheet metal to make, and serves as collecting electrode.For the application needing control of dust, electric discharge device as shown in Figure 3 and Figure 5 and application example can be adopted, because fixed electrode 3 and airflow direction are tangent, air-flow is without the need to passing fixed plate electrode, therefore, non-porous metal sheet can be adopted to make fixed electrode 3, make it have dust collection function.
Accompanying drawing explanation
Fig. 1 axial flow blower drives the electric discharge device schematic diagram of rotation electrode.
Fig. 2 centrifugal blower drives the electric discharge device schematic diagram of rotation electrode.
Fig. 3 cross flow fan drives the electric discharge device schematic diagram of rotation electrode.
Fig. 4 screen electrode schematic diagram.
The electric discharge device of Fig. 5 rotation electrode puts into the embodiment in tower fan.
1-wind wheel in figure, 2-negative electrode, 3-anode, 4-motor.
Detailed description of the invention 1
The axial flow blower of the specific embodiment of the invention 1 drives the electric discharge device of rotation electrode, and its structural representation as shown in Figure 1.
Rotation electrode 2 is the disk structures be set in parallel in by 9 ribbon screen electrode on metal ring, and circular rotation electrode 2 is identical with impeller 1 diameter, is fixed on impeller 1 by metal ring; Banded silk screen electrode gap 10mm on rotation electrode 2, fixed electrode 3 is fan Chain Link Fences of fence structure, and diameter is greater than impeller diameter; Rotation electrode 2 is 20mm with the spacing of fixed electrode 3, and driving voltage is 8kV, and corona discharge rated power is 10W; The rated power of motor 4 is 60W, and be provided with high speed, middling speed and low speed third gear, rotating speed is between 1200-1800r/m, and the air supplying distance of top gear reaches more than 8 meters, air quantity 800m
3/ h, low or first gear also reaches more than 5 meters, air quantity 400m
3/ h.
Detailed description of the invention 2
The centrifugal blower of the specific embodiment of the invention 2 drives the electric discharge device of rotation electrode, and its structural representation as shown in Figure 2.
Rotation electrode 2 is the disk structures be set in parallel in by 9 ribbon screen electrode on metal ring, and circular rotation electrode 2 is identical with impeller 1 diameter, is fixed on impeller 1 by metal ring; Banded silk screen electrode gap 10mm on rotation electrode 2, fixed electrode 3 is fan Chain Link Fences of fence structure, and diameter is greater than impeller diameter; Rotation electrode 2 is 20mm with the spacing of fixed electrode 3, and driving voltage is 8kV, and corona discharge rated power is 10W; The rated power of motor 4 is 90W, and be provided with high speed, middling speed and low speed third gear, rotating speed is between 1200-2400r/m, and the air supplying distance of top gear reaches more than 10 meters, air quantity 600m
3/ h, low or first gear also reaches more than 5 meters, air quantity 400m
3/ h.
Detailed description of the invention 3
The specific embodiment of the invention 3 is driven by cross flow fan the electric discharge device of rotation electrode to be applied in tower fan, and as shown in Figure 3, the overall schematic of tower fan as shown in Figure 5 for the partial structurtes schematic diagram of electric discharge device.
Rotation electrode 2 is the wire guipures be helically wound around on the wind wheel 1 of crossflow fan, spacing between metal tape adjoining spiral ring is 10mm, rotation electrode 2 keeps electrical contact with the bearing of wind wheel 1, and spiral helicine rotation electrode 2 two ends are all fixed on wind wheel 1; The rated power of motor 4 is 180W, and be provided with high speed, middling speed and low speed third gear, rotating speed is between 1600-2400r/m, and the air supplying distance of top gear reaches more than 15 meters, air quantity 3000m
3/ h, low or first gear also reaches more than 10 meters, air quantity 1800m
3/ h; Fixed electrode 3 is 2/5ths barrel surface collecting plates be made up of 0.3mm thickness stainless steel substrates, and fixed electrode 3 and high voltage source have contact to keep being electrically connected, and fixed electrode collecting plate is washable; Rotation electrode 2 is 20mm with the spacing of fixed electrode 3, and driving voltage is 8kV, and corona discharge rated power is 10W.
Claims (10)
1. the electric discharge device of rotation electrode, comprise impeller (1), rotation electrode (2), fixed electrode (3) and motor (4), rotation electrode (2) is arranged between impeller (1) and fixed electrode (3), rotation electrode (2) is fixed in the rotating shaft of motor (4), or be fixed on impeller (1), rotation electrode (2) keeps good electrical to be connected with the metal bearing of motor (4), high voltage between rotation electrode (2) and fixed electrode (3), corona discharge is produced between two arrays of electrodes, motor (4) drives impeller (1) and rotation electrode (2) High Rotation Speed, the rotation electrode (2) of High Rotation Speed drives corona to rotate, the plasma uniformity that corona discharge is produced is distributed in the whole flow area between two arrays of electrodes, air-flow is through corona discharge region, organic pollution is resolved into innocuous substance by the high energy particle in plasma, particle can bring electric charge, charged particle is easy to be collected by high electric field dust arrester, or by other adsorptions.
2. the electric discharge device of rotation electrode according to claim 1, it is characterized in that described rotation electrode (2) is arranged in the rotating shaft of motor (4), or be fixed on impeller (1), rotation electrode (2) keeps good electrical to be connected with the metal bearing of motor (4).
3. the electric discharge device of rotation electrode according to claim 1, is characterized in that described rotation electrode (2) discharges to fixed electrode (3) under the state of rotary motion.
4. the electric discharge device of rotation electrode according to claim 1, it is characterized in that described rotation electrode (2) is made up of fine metal mesh or conductive fiber silk screen, vapour lock is extremely low.
5. the electric discharge device of rotation electrode according to claim 1, it is characterized in that described rotation electrode (2) and fixed electrode (3) be arranged in parallel, spacing is therebetween between 8-90mm.
6. the electric discharge device of rotation electrode according to claim 1, is characterized in that described fixed electrode (3) is that conductive grid or sheet metal are made.
7. the electric discharge device of rotation electrode according to claim 1, is characterized in that described rotation electrode (2) and fixed electrode (3) discharging structure are arranged on front or the rear of motor (4).
8. the electric discharge device of rotation electrode according to claim 1, is characterized in that described rotation electrode (2) has rotational symmetry, is such as arranged on a disk, or is arranged on a face of cylinder.
9. the electric discharge device of rotation electrode according to claim 1, it is characterized in that described fixed electrode (3) has the structural form corresponding with rotation electrode (2), the two is both planar shaped, or is both circular-arc-shaped design.
10. the electric discharge device of rotation electrode according to claim 1, is characterized in that described fixed electrode (3) can adopt semi-cylindrical shaped sheet metal to make, serves as collecting electrode.
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| CN201410469210.5A CN105478240A (en) | 2014-09-16 | 2014-09-16 | Electric discharging device of rotation electrode |
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Application publication date: 20160413 |